Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f2c6203f MB |
2 | // |
3 | // core.c -- Voltage/Current Regulator framework. | |
4 | // | |
5 | // Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
6 | // Copyright 2008 SlimLogic Ltd. | |
7 | // | |
8 | // Author: Liam Girdwood <lrg@slimlogic.co.uk> | |
414c70cb LG |
9 | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
1130e5b3 | 12 | #include <linux/debugfs.h> |
414c70cb | 13 | #include <linux/device.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
f21e0e81 | 15 | #include <linux/async.h> |
414c70cb LG |
16 | #include <linux/err.h> |
17 | #include <linux/mutex.h> | |
18 | #include <linux/suspend.h> | |
31aae2be | 19 | #include <linux/delay.h> |
778b28b4 | 20 | #include <linux/gpio/consumer.h> |
69511a45 | 21 | #include <linux/of.h> |
65b19ce6 | 22 | #include <linux/regmap.h> |
69511a45 | 23 | #include <linux/regulator/of_regulator.h> |
414c70cb | 24 | #include <linux/regulator/consumer.h> |
d8ca7d18 | 25 | #include <linux/regulator/coupler.h> |
414c70cb LG |
26 | #include <linux/regulator/driver.h> |
27 | #include <linux/regulator/machine.h> | |
65602c32 | 28 | #include <linux/module.h> |
414c70cb | 29 | |
02fa3ec0 MB |
30 | #define CREATE_TRACE_POINTS |
31 | #include <trace/events/regulator.h> | |
32 | ||
34abbd68 | 33 | #include "dummy.h" |
0cdfcc0f | 34 | #include "internal.h" |
34abbd68 | 35 | |
f8702f9e DO |
36 | static DEFINE_WW_CLASS(regulator_ww_class); |
37 | static DEFINE_MUTEX(regulator_nesting_mutex); | |
414c70cb | 38 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 39 | static LIST_HEAD(regulator_map_list); |
f19b00da | 40 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 41 | static LIST_HEAD(regulator_supply_alias_list); |
d8ca7d18 | 42 | static LIST_HEAD(regulator_coupler_list); |
21cf891a | 43 | static bool has_full_constraints; |
414c70cb | 44 | |
1130e5b3 | 45 | static struct dentry *debugfs_root; |
1130e5b3 | 46 | |
8dc5390d | 47 | /* |
414c70cb LG |
48 | * struct regulator_map |
49 | * | |
50 | * Used to provide symbolic supply names to devices. | |
51 | */ | |
52 | struct regulator_map { | |
53 | struct list_head list; | |
40f9244f | 54 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 55 | const char *supply; |
a5766f11 | 56 | struct regulator_dev *regulator; |
414c70cb LG |
57 | }; |
58 | ||
f19b00da KM |
59 | /* |
60 | * struct regulator_enable_gpio | |
61 | * | |
62 | * Management for shared enable GPIO pin | |
63 | */ | |
64 | struct regulator_enable_gpio { | |
65 | struct list_head list; | |
778b28b4 | 66 | struct gpio_desc *gpiod; |
f19b00da KM |
67 | u32 enable_count; /* a number of enabled shared GPIO */ |
68 | u32 request_count; /* a number of requested shared GPIO */ | |
f19b00da KM |
69 | }; |
70 | ||
a06ccd9c CK |
71 | /* |
72 | * struct regulator_supply_alias | |
73 | * | |
74 | * Used to map lookups for a supply onto an alternative device. | |
75 | */ | |
76 | struct regulator_supply_alias { | |
77 | struct list_head list; | |
78 | struct device *src_dev; | |
79 | const char *src_supply; | |
80 | struct device *alias_dev; | |
81 | const char *alias_supply; | |
82 | }; | |
83 | ||
414c70cb | 84 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
5451781d | 85 | static int _regulator_disable(struct regulator *regulator); |
0f2d636e | 86 | static int _regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags); |
414c70cb LG |
87 | static int _regulator_get_current_limit(struct regulator_dev *rdev); |
88 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 89 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 90 | unsigned long event, void *data); |
75790251 MB |
91 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
92 | int min_uV, int max_uV); | |
c054c6c7 MP |
93 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
94 | suspend_state_t state); | |
3801b86a MB |
95 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
96 | struct device *dev, | |
97 | const char *supply_name); | |
e1794aa4 | 98 | static void destroy_regulator(struct regulator *regulator); |
36a1f1b6 | 99 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 100 | |
d22b85a1 | 101 | const char *rdev_get_name(struct regulator_dev *rdev) |
1083c393 MB |
102 | { |
103 | if (rdev->constraints && rdev->constraints->name) | |
104 | return rdev->constraints->name; | |
105 | else if (rdev->desc->name) | |
106 | return rdev->desc->name; | |
107 | else | |
108 | return ""; | |
109 | } | |
157d2230 | 110 | EXPORT_SYMBOL_GPL(rdev_get_name); |
1083c393 | 111 | |
87b28417 MB |
112 | static bool have_full_constraints(void) |
113 | { | |
75bc9641 | 114 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
115 | } |
116 | ||
8a34e979 WP |
117 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
118 | { | |
119 | if (!rdev->constraints) { | |
120 | rdev_err(rdev, "no constraints\n"); | |
121 | return false; | |
122 | } | |
123 | ||
124 | if (rdev->constraints->valid_ops_mask & ops) | |
125 | return true; | |
126 | ||
127 | return false; | |
128 | } | |
129 | ||
66cf9a7e MP |
130 | /** |
131 | * regulator_lock_nested - lock a single regulator | |
132 | * @rdev: regulator source | |
f8702f9e | 133 | * @ww_ctx: w/w mutex acquire context |
66cf9a7e MP |
134 | * |
135 | * This function can be called many times by one task on | |
136 | * a single regulator and its mutex will be locked only | |
137 | * once. If a task, which is calling this function is other | |
138 | * than the one, which initially locked the mutex, it will | |
139 | * wait on mutex. | |
140 | */ | |
f8702f9e DO |
141 | static inline int regulator_lock_nested(struct regulator_dev *rdev, |
142 | struct ww_acquire_ctx *ww_ctx) | |
66cf9a7e | 143 | { |
f8702f9e DO |
144 | bool lock = false; |
145 | int ret = 0; | |
146 | ||
147 | mutex_lock(®ulator_nesting_mutex); | |
148 | ||
12235da8 | 149 | if (!ww_mutex_trylock(&rdev->mutex, ww_ctx)) { |
f8702f9e | 150 | if (rdev->mutex_owner == current) |
66cf9a7e | 151 | rdev->ref_cnt++; |
f8702f9e DO |
152 | else |
153 | lock = true; | |
154 | ||
155 | if (lock) { | |
156 | mutex_unlock(®ulator_nesting_mutex); | |
157 | ret = ww_mutex_lock(&rdev->mutex, ww_ctx); | |
158 | mutex_lock(®ulator_nesting_mutex); | |
66cf9a7e | 159 | } |
f8702f9e DO |
160 | } else { |
161 | lock = true; | |
66cf9a7e MP |
162 | } |
163 | ||
f8702f9e DO |
164 | if (lock && ret != -EDEADLK) { |
165 | rdev->ref_cnt++; | |
166 | rdev->mutex_owner = current; | |
167 | } | |
168 | ||
169 | mutex_unlock(®ulator_nesting_mutex); | |
170 | ||
171 | return ret; | |
66cf9a7e MP |
172 | } |
173 | ||
f8702f9e DO |
174 | /** |
175 | * regulator_lock - lock a single regulator | |
176 | * @rdev: regulator source | |
177 | * | |
178 | * This function can be called many times by one task on | |
179 | * a single regulator and its mutex will be locked only | |
180 | * once. If a task, which is calling this function is other | |
181 | * than the one, which initially locked the mutex, it will | |
182 | * wait on mutex. | |
183 | */ | |
4c9db393 | 184 | static void regulator_lock(struct regulator_dev *rdev) |
66cf9a7e | 185 | { |
f8702f9e | 186 | regulator_lock_nested(rdev, NULL); |
66cf9a7e MP |
187 | } |
188 | ||
189 | /** | |
190 | * regulator_unlock - unlock a single regulator | |
191 | * @rdev: regulator_source | |
192 | * | |
193 | * This function unlocks the mutex when the | |
194 | * reference counter reaches 0. | |
195 | */ | |
4c9db393 | 196 | static void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 197 | { |
f8702f9e | 198 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 199 | |
f8702f9e DO |
200 | if (--rdev->ref_cnt == 0) { |
201 | rdev->mutex_owner = NULL; | |
202 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 203 | } |
f8702f9e DO |
204 | |
205 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
206 | ||
207 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e MP |
208 | } |
209 | ||
089e2cc2 | 210 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 211 | { |
089e2cc2 DO |
212 | struct regulator_dev *c_rdev; |
213 | int i; | |
214 | ||
215 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
216 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 217 | |
089e2cc2 DO |
218 | if (rdev->supply->rdev == c_rdev) |
219 | return true; | |
220 | } | |
221 | ||
222 | return false; | |
223 | } | |
224 | ||
f8702f9e DO |
225 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
226 | unsigned int n_coupled) | |
9f01cd4a | 227 | { |
0a7416f9 DO |
228 | struct regulator_dev *c_rdev, *supply_rdev; |
229 | int i, supply_n_coupled; | |
9f01cd4a | 230 | |
f8702f9e DO |
231 | for (i = n_coupled; i > 0; i--) { |
232 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
233 | |
234 | if (!c_rdev) | |
235 | continue; | |
236 | ||
0a7416f9 DO |
237 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
238 | supply_rdev = c_rdev->supply->rdev; | |
239 | supply_n_coupled = supply_rdev->coupling_desc.n_coupled; | |
240 | ||
241 | regulator_unlock_recursive(supply_rdev, | |
242 | supply_n_coupled); | |
243 | } | |
9243a195 | 244 | |
f8702f9e DO |
245 | regulator_unlock(c_rdev); |
246 | } | |
9f01cd4a SH |
247 | } |
248 | ||
f8702f9e DO |
249 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
250 | struct regulator_dev **new_contended_rdev, | |
251 | struct regulator_dev **old_contended_rdev, | |
252 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 253 | { |
9243a195 | 254 | struct regulator_dev *c_rdev; |
f8702f9e | 255 | int i, err; |
9f01cd4a | 256 | |
9243a195 MP |
257 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
258 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 259 | |
9243a195 MP |
260 | if (!c_rdev) |
261 | continue; | |
9f01cd4a | 262 | |
f8702f9e DO |
263 | if (c_rdev != *old_contended_rdev) { |
264 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
265 | if (err) { | |
266 | if (err == -EDEADLK) { | |
267 | *new_contended_rdev = c_rdev; | |
268 | goto err_unlock; | |
269 | } | |
9243a195 | 270 | |
f8702f9e DO |
271 | /* shouldn't happen */ |
272 | WARN_ON_ONCE(err != -EALREADY); | |
273 | } | |
274 | } else { | |
275 | *old_contended_rdev = NULL; | |
276 | } | |
277 | ||
089e2cc2 | 278 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
279 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
280 | new_contended_rdev, | |
281 | old_contended_rdev, | |
282 | ww_ctx); | |
283 | if (err) { | |
284 | regulator_unlock(c_rdev); | |
285 | goto err_unlock; | |
286 | } | |
66cf9a7e MP |
287 | } |
288 | } | |
f8702f9e DO |
289 | |
290 | return 0; | |
291 | ||
292 | err_unlock: | |
293 | regulator_unlock_recursive(rdev, i); | |
294 | ||
295 | return err; | |
66cf9a7e MP |
296 | } |
297 | ||
38de19fa | 298 | /** |
f8702f9e DO |
299 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
300 | * regulators | |
301 | * @rdev: regulator source | |
302 | * @ww_ctx: w/w mutex acquire context | |
303 | * | |
48f1b4ef | 304 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 305 | */ |
f8702f9e DO |
306 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
307 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 308 | { |
f8702f9e DO |
309 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
310 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
311 | } |
312 | ||
313 | /** | |
9243a195 MP |
314 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
315 | * @rdev: regulator source | |
f8702f9e | 316 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
317 | * |
318 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 319 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 320 | */ |
f8702f9e DO |
321 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
322 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 323 | { |
f8702f9e DO |
324 | struct regulator_dev *new_contended_rdev = NULL; |
325 | struct regulator_dev *old_contended_rdev = NULL; | |
326 | int err; | |
9f01cd4a | 327 | |
f8702f9e | 328 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 329 | |
f8702f9e | 330 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 331 | |
f8702f9e DO |
332 | do { |
333 | if (new_contended_rdev) { | |
334 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
335 | old_contended_rdev = new_contended_rdev; | |
336 | old_contended_rdev->ref_cnt++; | |
337 | } | |
338 | ||
339 | err = regulator_lock_recursive(rdev, | |
340 | &new_contended_rdev, | |
341 | &old_contended_rdev, | |
342 | ww_ctx); | |
343 | ||
344 | if (old_contended_rdev) | |
345 | regulator_unlock(old_contended_rdev); | |
346 | ||
347 | } while (err == -EDEADLK); | |
348 | ||
349 | ww_acquire_done(ww_ctx); | |
350 | ||
351 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
352 | } |
353 | ||
fe06051d | 354 | /** |
355 | * of_get_child_regulator - get a child regulator device node | |
356 | * based on supply name | |
357 | * @parent: Parent device node | |
358 | * @prop_name: Combination regulator supply name and "-supply" | |
359 | * | |
360 | * Traverse all child nodes. | |
361 | * Extract the child regulator device node corresponding to the supply name. | |
362 | * returns the device node corresponding to the regulator if found, else | |
363 | * returns NULL. | |
364 | */ | |
365 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
366 | const char *prop_name) | |
367 | { | |
368 | struct device_node *regnode = NULL; | |
369 | struct device_node *child = NULL; | |
370 | ||
371 | for_each_child_of_node(parent, child) { | |
372 | regnode = of_parse_phandle(child, prop_name, 0); | |
373 | ||
374 | if (!regnode) { | |
375 | regnode = of_get_child_regulator(child, prop_name); | |
81eeb0a3 ND |
376 | if (regnode) |
377 | goto err_node_put; | |
fe06051d | 378 | } else { |
81eeb0a3 | 379 | goto err_node_put; |
fe06051d | 380 | } |
381 | } | |
382 | return NULL; | |
81eeb0a3 ND |
383 | |
384 | err_node_put: | |
385 | of_node_put(child); | |
386 | return regnode; | |
fe06051d | 387 | } |
388 | ||
69511a45 RN |
389 | /** |
390 | * of_get_regulator - get a regulator device node based on supply name | |
391 | * @dev: Device pointer for the consumer (of regulator) device | |
392 | * @supply: regulator supply name | |
393 | * | |
394 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 395 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
396 | * returns NULL. |
397 | */ | |
398 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
399 | { | |
400 | struct device_node *regnode = NULL; | |
e9bb4a06 | 401 | char prop_name[64]; /* 64 is max size of property name */ |
69511a45 RN |
402 | |
403 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
404 | ||
e9bb4a06 | 405 | snprintf(prop_name, 64, "%s-supply", supply); |
69511a45 RN |
406 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); |
407 | ||
408 | if (!regnode) { | |
fe06051d | 409 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
410 | if (regnode) | |
411 | return regnode; | |
412 | ||
7799167b RH |
413 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
414 | prop_name, dev->of_node); | |
69511a45 RN |
415 | return NULL; |
416 | } | |
417 | return regnode; | |
418 | } | |
419 | ||
414c70cb | 420 | /* Platform voltage constraint check */ |
d22b85a1 DO |
421 | int regulator_check_voltage(struct regulator_dev *rdev, |
422 | int *min_uV, int *max_uV) | |
414c70cb LG |
423 | { |
424 | BUG_ON(*min_uV > *max_uV); | |
425 | ||
8a34e979 | 426 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 427 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
428 | return -EPERM; |
429 | } | |
430 | ||
431 | if (*max_uV > rdev->constraints->max_uV) | |
432 | *max_uV = rdev->constraints->max_uV; | |
433 | if (*min_uV < rdev->constraints->min_uV) | |
434 | *min_uV = rdev->constraints->min_uV; | |
435 | ||
89f425ed MB |
436 | if (*min_uV > *max_uV) { |
437 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 438 | *min_uV, *max_uV); |
414c70cb | 439 | return -EINVAL; |
89f425ed | 440 | } |
414c70cb LG |
441 | |
442 | return 0; | |
443 | } | |
444 | ||
f7efad10 CZ |
445 | /* return 0 if the state is valid */ |
446 | static int regulator_check_states(suspend_state_t state) | |
447 | { | |
448 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
449 | } | |
450 | ||
05fda3b1 TP |
451 | /* Make sure we select a voltage that suits the needs of all |
452 | * regulator consumers | |
453 | */ | |
d22b85a1 DO |
454 | int regulator_check_consumers(struct regulator_dev *rdev, |
455 | int *min_uV, int *max_uV, | |
456 | suspend_state_t state) | |
05fda3b1 TP |
457 | { |
458 | struct regulator *regulator; | |
c360a6df | 459 | struct regulator_voltage *voltage; |
05fda3b1 TP |
460 | |
461 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 462 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
463 | /* |
464 | * Assume consumers that didn't say anything are OK | |
465 | * with anything in the constraint range. | |
466 | */ | |
c360a6df | 467 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
468 | continue; |
469 | ||
c360a6df CZ |
470 | if (*max_uV > voltage->max_uV) |
471 | *max_uV = voltage->max_uV; | |
472 | if (*min_uV < voltage->min_uV) | |
473 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
474 | } |
475 | ||
dd8004af | 476 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
477 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
478 | *min_uV, *max_uV); | |
05fda3b1 | 479 | return -EINVAL; |
dd8004af | 480 | } |
05fda3b1 TP |
481 | |
482 | return 0; | |
483 | } | |
484 | ||
414c70cb LG |
485 | /* current constraint check */ |
486 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
487 | int *min_uA, int *max_uA) | |
488 | { | |
489 | BUG_ON(*min_uA > *max_uA); | |
490 | ||
8a34e979 | 491 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 492 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
493 | return -EPERM; |
494 | } | |
495 | ||
496 | if (*max_uA > rdev->constraints->max_uA) | |
497 | *max_uA = rdev->constraints->max_uA; | |
498 | if (*min_uA < rdev->constraints->min_uA) | |
499 | *min_uA = rdev->constraints->min_uA; | |
500 | ||
89f425ed MB |
501 | if (*min_uA > *max_uA) { |
502 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 503 | *min_uA, *max_uA); |
414c70cb | 504 | return -EINVAL; |
89f425ed | 505 | } |
414c70cb LG |
506 | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* operating mode constraint check */ | |
109c75af CK |
511 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
512 | unsigned int *mode) | |
414c70cb | 513 | { |
2c608234 | 514 | switch (*mode) { |
e573520b DB |
515 | case REGULATOR_MODE_FAST: |
516 | case REGULATOR_MODE_NORMAL: | |
517 | case REGULATOR_MODE_IDLE: | |
518 | case REGULATOR_MODE_STANDBY: | |
519 | break; | |
520 | default: | |
89f425ed | 521 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
522 | return -EINVAL; |
523 | } | |
524 | ||
8a34e979 | 525 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 526 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
527 | return -EPERM; |
528 | } | |
2c608234 MB |
529 | |
530 | /* The modes are bitmasks, the most power hungry modes having | |
531 | * the lowest values. If the requested mode isn't supported | |
69b8821e SK |
532 | * try higher modes. |
533 | */ | |
2c608234 MB |
534 | while (*mode) { |
535 | if (rdev->constraints->valid_modes_mask & *mode) | |
536 | return 0; | |
537 | *mode /= 2; | |
414c70cb | 538 | } |
2c608234 MB |
539 | |
540 | return -EINVAL; | |
414c70cb LG |
541 | } |
542 | ||
f7efad10 CZ |
543 | static inline struct regulator_state * |
544 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
545 | { | |
546 | if (rdev->constraints == NULL) | |
547 | return NULL; | |
548 | ||
549 | switch (state) { | |
550 | case PM_SUSPEND_STANDBY: | |
551 | return &rdev->constraints->state_standby; | |
552 | case PM_SUSPEND_MEM: | |
553 | return &rdev->constraints->state_mem; | |
554 | case PM_SUSPEND_MAX: | |
555 | return &rdev->constraints->state_disk; | |
556 | default: | |
557 | return NULL; | |
558 | } | |
559 | } | |
560 | ||
0955f5be SB |
561 | static const struct regulator_state * |
562 | regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state) | |
563 | { | |
564 | const struct regulator_state *rstate; | |
565 | ||
566 | rstate = regulator_get_suspend_state(rdev, state); | |
567 | if (rstate == NULL) | |
568 | return NULL; | |
569 | ||
570 | /* If we have no suspend mode configuration don't set anything; | |
571 | * only warn if the driver implements set_suspend_voltage or | |
572 | * set_suspend_mode callback. | |
573 | */ | |
574 | if (rstate->enabled != ENABLE_IN_SUSPEND && | |
575 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
576 | if (rdev->desc->ops->set_suspend_voltage || | |
577 | rdev->desc->ops->set_suspend_mode) | |
578 | rdev_warn(rdev, "No configuration\n"); | |
579 | return NULL; | |
580 | } | |
581 | ||
582 | return rstate; | |
583 | } | |
584 | ||
a277a262 Y |
585 | static ssize_t microvolts_show(struct device *dev, |
586 | struct device_attribute *attr, char *buf) | |
414c70cb | 587 | { |
a5766f11 | 588 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
c82f27df | 589 | int uV; |
414c70cb | 590 | |
66cf9a7e | 591 | regulator_lock(rdev); |
c82f27df | 592 | uV = regulator_get_voltage_rdev(rdev); |
66cf9a7e | 593 | regulator_unlock(rdev); |
414c70cb | 594 | |
c82f27df NS |
595 | if (uV < 0) |
596 | return uV; | |
597 | return sprintf(buf, "%d\n", uV); | |
414c70cb | 598 | } |
a277a262 | 599 | static DEVICE_ATTR_RO(microvolts); |
414c70cb | 600 | |
a277a262 Y |
601 | static ssize_t microamps_show(struct device *dev, |
602 | struct device_attribute *attr, char *buf) | |
414c70cb | 603 | { |
a5766f11 | 604 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
605 | |
606 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
607 | } | |
a277a262 | 608 | static DEVICE_ATTR_RO(microamps); |
414c70cb | 609 | |
587cea27 GKH |
610 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
611 | char *buf) | |
bc558a60 MB |
612 | { |
613 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 614 | |
1083c393 | 615 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 616 | } |
587cea27 | 617 | static DEVICE_ATTR_RO(name); |
bc558a60 | 618 | |
01de19d0 | 619 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 620 | { |
414c70cb LG |
621 | switch (mode) { |
622 | case REGULATOR_MODE_FAST: | |
01de19d0 | 623 | return "fast"; |
414c70cb | 624 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 625 | return "normal"; |
414c70cb | 626 | case REGULATOR_MODE_IDLE: |
01de19d0 | 627 | return "idle"; |
414c70cb | 628 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 629 | return "standby"; |
414c70cb | 630 | } |
01de19d0 DA |
631 | return "unknown"; |
632 | } | |
633 | ||
634 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
635 | { | |
636 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
637 | } |
638 | ||
a277a262 Y |
639 | static ssize_t opmode_show(struct device *dev, |
640 | struct device_attribute *attr, char *buf) | |
414c70cb | 641 | { |
a5766f11 | 642 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 643 | |
4fca9545 DB |
644 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
645 | } | |
a277a262 | 646 | static DEVICE_ATTR_RO(opmode); |
4fca9545 DB |
647 | |
648 | static ssize_t regulator_print_state(char *buf, int state) | |
649 | { | |
414c70cb LG |
650 | if (state > 0) |
651 | return sprintf(buf, "enabled\n"); | |
652 | else if (state == 0) | |
653 | return sprintf(buf, "disabled\n"); | |
654 | else | |
655 | return sprintf(buf, "unknown\n"); | |
656 | } | |
657 | ||
a277a262 Y |
658 | static ssize_t state_show(struct device *dev, |
659 | struct device_attribute *attr, char *buf) | |
4fca9545 DB |
660 | { |
661 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
662 | ssize_t ret; |
663 | ||
66cf9a7e | 664 | regulator_lock(rdev); |
9332546f | 665 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 666 | regulator_unlock(rdev); |
4fca9545 | 667 | |
9332546f | 668 | return ret; |
4fca9545 | 669 | } |
a277a262 | 670 | static DEVICE_ATTR_RO(state); |
4fca9545 | 671 | |
a277a262 Y |
672 | static ssize_t status_show(struct device *dev, |
673 | struct device_attribute *attr, char *buf) | |
853116a1 DB |
674 | { |
675 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
676 | int status; | |
677 | char *label; | |
678 | ||
679 | status = rdev->desc->ops->get_status(rdev); | |
680 | if (status < 0) | |
681 | return status; | |
682 | ||
683 | switch (status) { | |
684 | case REGULATOR_STATUS_OFF: | |
685 | label = "off"; | |
686 | break; | |
687 | case REGULATOR_STATUS_ON: | |
688 | label = "on"; | |
689 | break; | |
690 | case REGULATOR_STATUS_ERROR: | |
691 | label = "error"; | |
692 | break; | |
693 | case REGULATOR_STATUS_FAST: | |
694 | label = "fast"; | |
695 | break; | |
696 | case REGULATOR_STATUS_NORMAL: | |
697 | label = "normal"; | |
698 | break; | |
699 | case REGULATOR_STATUS_IDLE: | |
700 | label = "idle"; | |
701 | break; | |
702 | case REGULATOR_STATUS_STANDBY: | |
703 | label = "standby"; | |
704 | break; | |
f59c8f9f MB |
705 | case REGULATOR_STATUS_BYPASS: |
706 | label = "bypass"; | |
707 | break; | |
1beaf762 KG |
708 | case REGULATOR_STATUS_UNDEFINED: |
709 | label = "undefined"; | |
710 | break; | |
853116a1 DB |
711 | default: |
712 | return -ERANGE; | |
713 | } | |
714 | ||
715 | return sprintf(buf, "%s\n", label); | |
716 | } | |
a277a262 | 717 | static DEVICE_ATTR_RO(status); |
853116a1 | 718 | |
a277a262 Y |
719 | static ssize_t min_microamps_show(struct device *dev, |
720 | struct device_attribute *attr, char *buf) | |
414c70cb | 721 | { |
a5766f11 | 722 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
723 | |
724 | if (!rdev->constraints) | |
725 | return sprintf(buf, "constraint not defined\n"); | |
726 | ||
727 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
728 | } | |
a277a262 | 729 | static DEVICE_ATTR_RO(min_microamps); |
414c70cb | 730 | |
a277a262 Y |
731 | static ssize_t max_microamps_show(struct device *dev, |
732 | struct device_attribute *attr, char *buf) | |
414c70cb | 733 | { |
a5766f11 | 734 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
735 | |
736 | if (!rdev->constraints) | |
737 | return sprintf(buf, "constraint not defined\n"); | |
738 | ||
739 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
740 | } | |
a277a262 | 741 | static DEVICE_ATTR_RO(max_microamps); |
414c70cb | 742 | |
a277a262 Y |
743 | static ssize_t min_microvolts_show(struct device *dev, |
744 | struct device_attribute *attr, char *buf) | |
414c70cb | 745 | { |
a5766f11 | 746 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
747 | |
748 | if (!rdev->constraints) | |
749 | return sprintf(buf, "constraint not defined\n"); | |
750 | ||
751 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
752 | } | |
a277a262 | 753 | static DEVICE_ATTR_RO(min_microvolts); |
414c70cb | 754 | |
a277a262 Y |
755 | static ssize_t max_microvolts_show(struct device *dev, |
756 | struct device_attribute *attr, char *buf) | |
414c70cb | 757 | { |
a5766f11 | 758 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
759 | |
760 | if (!rdev->constraints) | |
761 | return sprintf(buf, "constraint not defined\n"); | |
762 | ||
763 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
764 | } | |
a277a262 | 765 | static DEVICE_ATTR_RO(max_microvolts); |
414c70cb | 766 | |
a277a262 Y |
767 | static ssize_t requested_microamps_show(struct device *dev, |
768 | struct device_attribute *attr, char *buf) | |
414c70cb | 769 | { |
a5766f11 | 770 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
771 | struct regulator *regulator; |
772 | int uA = 0; | |
773 | ||
66cf9a7e | 774 | regulator_lock(rdev); |
5451781d DA |
775 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
776 | if (regulator->enable_count) | |
777 | uA += regulator->uA_load; | |
778 | } | |
66cf9a7e | 779 | regulator_unlock(rdev); |
414c70cb LG |
780 | return sprintf(buf, "%d\n", uA); |
781 | } | |
a277a262 | 782 | static DEVICE_ATTR_RO(requested_microamps); |
414c70cb | 783 | |
587cea27 GKH |
784 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
785 | char *buf) | |
414c70cb | 786 | { |
a5766f11 | 787 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
788 | return sprintf(buf, "%d\n", rdev->use_count); |
789 | } | |
587cea27 | 790 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 791 | |
587cea27 GKH |
792 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
793 | char *buf) | |
414c70cb | 794 | { |
a5766f11 | 795 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
796 | |
797 | switch (rdev->desc->type) { | |
798 | case REGULATOR_VOLTAGE: | |
799 | return sprintf(buf, "voltage\n"); | |
800 | case REGULATOR_CURRENT: | |
801 | return sprintf(buf, "current\n"); | |
802 | } | |
803 | return sprintf(buf, "unknown\n"); | |
804 | } | |
587cea27 | 805 | static DEVICE_ATTR_RO(type); |
414c70cb | 806 | |
a277a262 Y |
807 | static ssize_t suspend_mem_microvolts_show(struct device *dev, |
808 | struct device_attribute *attr, char *buf) | |
414c70cb | 809 | { |
a5766f11 | 810 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 811 | |
414c70cb LG |
812 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
813 | } | |
a277a262 | 814 | static DEVICE_ATTR_RO(suspend_mem_microvolts); |
414c70cb | 815 | |
a277a262 Y |
816 | static ssize_t suspend_disk_microvolts_show(struct device *dev, |
817 | struct device_attribute *attr, char *buf) | |
414c70cb | 818 | { |
a5766f11 | 819 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 820 | |
414c70cb LG |
821 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
822 | } | |
a277a262 | 823 | static DEVICE_ATTR_RO(suspend_disk_microvolts); |
414c70cb | 824 | |
a277a262 Y |
825 | static ssize_t suspend_standby_microvolts_show(struct device *dev, |
826 | struct device_attribute *attr, char *buf) | |
414c70cb | 827 | { |
a5766f11 | 828 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 829 | |
414c70cb LG |
830 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
831 | } | |
a277a262 | 832 | static DEVICE_ATTR_RO(suspend_standby_microvolts); |
414c70cb | 833 | |
a277a262 Y |
834 | static ssize_t suspend_mem_mode_show(struct device *dev, |
835 | struct device_attribute *attr, char *buf) | |
414c70cb | 836 | { |
a5766f11 | 837 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 838 | |
4fca9545 DB |
839 | return regulator_print_opmode(buf, |
840 | rdev->constraints->state_mem.mode); | |
414c70cb | 841 | } |
a277a262 | 842 | static DEVICE_ATTR_RO(suspend_mem_mode); |
414c70cb | 843 | |
a277a262 Y |
844 | static ssize_t suspend_disk_mode_show(struct device *dev, |
845 | struct device_attribute *attr, char *buf) | |
414c70cb | 846 | { |
a5766f11 | 847 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 848 | |
4fca9545 DB |
849 | return regulator_print_opmode(buf, |
850 | rdev->constraints->state_disk.mode); | |
414c70cb | 851 | } |
a277a262 | 852 | static DEVICE_ATTR_RO(suspend_disk_mode); |
414c70cb | 853 | |
a277a262 Y |
854 | static ssize_t suspend_standby_mode_show(struct device *dev, |
855 | struct device_attribute *attr, char *buf) | |
414c70cb | 856 | { |
a5766f11 | 857 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 858 | |
4fca9545 DB |
859 | return regulator_print_opmode(buf, |
860 | rdev->constraints->state_standby.mode); | |
414c70cb | 861 | } |
a277a262 | 862 | static DEVICE_ATTR_RO(suspend_standby_mode); |
414c70cb | 863 | |
a277a262 Y |
864 | static ssize_t suspend_mem_state_show(struct device *dev, |
865 | struct device_attribute *attr, char *buf) | |
414c70cb | 866 | { |
a5766f11 | 867 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 868 | |
4fca9545 DB |
869 | return regulator_print_state(buf, |
870 | rdev->constraints->state_mem.enabled); | |
414c70cb | 871 | } |
a277a262 | 872 | static DEVICE_ATTR_RO(suspend_mem_state); |
414c70cb | 873 | |
a277a262 Y |
874 | static ssize_t suspend_disk_state_show(struct device *dev, |
875 | struct device_attribute *attr, char *buf) | |
414c70cb | 876 | { |
a5766f11 | 877 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 878 | |
4fca9545 DB |
879 | return regulator_print_state(buf, |
880 | rdev->constraints->state_disk.enabled); | |
414c70cb | 881 | } |
a277a262 | 882 | static DEVICE_ATTR_RO(suspend_disk_state); |
414c70cb | 883 | |
a277a262 Y |
884 | static ssize_t suspend_standby_state_show(struct device *dev, |
885 | struct device_attribute *attr, char *buf) | |
414c70cb | 886 | { |
a5766f11 | 887 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 888 | |
4fca9545 DB |
889 | return regulator_print_state(buf, |
890 | rdev->constraints->state_standby.enabled); | |
414c70cb | 891 | } |
a277a262 | 892 | static DEVICE_ATTR_RO(suspend_standby_state); |
7ad68e2f | 893 | |
a277a262 Y |
894 | static ssize_t bypass_show(struct device *dev, |
895 | struct device_attribute *attr, char *buf) | |
f59c8f9f MB |
896 | { |
897 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
898 | const char *report; | |
899 | bool bypass; | |
900 | int ret; | |
901 | ||
902 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
903 | ||
904 | if (ret != 0) | |
905 | report = "unknown"; | |
906 | else if (bypass) | |
907 | report = "enabled"; | |
908 | else | |
909 | report = "disabled"; | |
910 | ||
911 | return sprintf(buf, "%s\n", report); | |
912 | } | |
a277a262 | 913 | static DEVICE_ATTR_RO(bypass); |
bc558a60 | 914 | |
0f2d636e ZW |
915 | #define REGULATOR_ERROR_ATTR(name, bit) \ |
916 | static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \ | |
917 | char *buf) \ | |
918 | { \ | |
919 | int ret; \ | |
920 | unsigned int flags; \ | |
921 | struct regulator_dev *rdev = dev_get_drvdata(dev); \ | |
922 | ret = _regulator_get_error_flags(rdev, &flags); \ | |
923 | if (ret) \ | |
924 | return ret; \ | |
925 | return sysfs_emit(buf, "%d\n", !!(flags & (bit))); \ | |
926 | } \ | |
927 | static DEVICE_ATTR_RO(name) | |
928 | ||
929 | REGULATOR_ERROR_ATTR(under_voltage, REGULATOR_ERROR_UNDER_VOLTAGE); | |
930 | REGULATOR_ERROR_ATTR(over_current, REGULATOR_ERROR_OVER_CURRENT); | |
931 | REGULATOR_ERROR_ATTR(regulation_out, REGULATOR_ERROR_REGULATION_OUT); | |
932 | REGULATOR_ERROR_ATTR(fail, REGULATOR_ERROR_FAIL); | |
933 | REGULATOR_ERROR_ATTR(over_temp, REGULATOR_ERROR_OVER_TEMP); | |
934 | REGULATOR_ERROR_ATTR(under_voltage_warn, REGULATOR_ERROR_UNDER_VOLTAGE_WARN); | |
935 | REGULATOR_ERROR_ATTR(over_current_warn, REGULATOR_ERROR_OVER_CURRENT_WARN); | |
936 | REGULATOR_ERROR_ATTR(over_voltage_warn, REGULATOR_ERROR_OVER_VOLTAGE_WARN); | |
937 | REGULATOR_ERROR_ATTR(over_temp_warn, REGULATOR_ERROR_OVER_TEMP_WARN); | |
938 | ||
414c70cb | 939 | /* Calculate the new optimum regulator operating mode based on the new total |
69b8821e SK |
940 | * consumer load. All locks held by caller |
941 | */ | |
8460ef38 | 942 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
943 | { |
944 | struct regulator *sibling; | |
945 | int current_uA = 0, output_uV, input_uV, err; | |
946 | unsigned int mode; | |
947 | ||
8460ef38 BA |
948 | /* |
949 | * first check to see if we can set modes at all, otherwise just | |
950 | * tell the consumer everything is OK. | |
951 | */ | |
74a569ee MG |
952 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
953 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 954 | return 0; |
74a569ee | 955 | } |
8460ef38 | 956 | |
8f4490e0 BA |
957 | if (!rdev->desc->ops->get_optimum_mode && |
958 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
959 | return 0; |
960 | ||
8f4490e0 BA |
961 | if (!rdev->desc->ops->set_mode && |
962 | !rdev->desc->ops->set_load) | |
8460ef38 | 963 | return -EINVAL; |
414c70cb | 964 | |
414c70cb | 965 | /* calc total requested load */ |
5451781d DA |
966 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
967 | if (sibling->enable_count) | |
968 | current_uA += sibling->uA_load; | |
969 | } | |
414c70cb | 970 | |
22a10bca SB |
971 | current_uA += rdev->constraints->system_load; |
972 | ||
8f4490e0 BA |
973 | if (rdev->desc->ops->set_load) { |
974 | /* set the optimum mode for our new total regulator load */ | |
975 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
976 | if (err < 0) | |
61aab5ad MM |
977 | rdev_err(rdev, "failed to set load %d: %pe\n", |
978 | current_uA, ERR_PTR(err)); | |
8f4490e0 | 979 | } else { |
57919f4a DA |
980 | /* |
981 | * Unfortunately in some cases the constraints->valid_ops has | |
982 | * REGULATOR_CHANGE_DRMS but there are no valid modes listed. | |
983 | * That's not really legit but we won't consider it a fatal | |
984 | * error here. We'll treat it as if REGULATOR_CHANGE_DRMS | |
985 | * wasn't set. | |
986 | */ | |
987 | if (!rdev->constraints->valid_modes_mask) { | |
988 | rdev_dbg(rdev, "Can change modes; but no valid mode\n"); | |
989 | return 0; | |
990 | } | |
991 | ||
57776617 | 992 | /* get output voltage */ |
d22b85a1 | 993 | output_uV = regulator_get_voltage_rdev(rdev); |
55841199 DA |
994 | |
995 | /* | |
996 | * Don't return an error; if regulator driver cares about | |
997 | * output_uV then it's up to the driver to validate. | |
998 | */ | |
999 | if (output_uV <= 0) | |
1000 | rdev_dbg(rdev, "invalid output voltage found\n"); | |
57776617 JP |
1001 | |
1002 | /* get input voltage */ | |
1003 | input_uV = 0; | |
1004 | if (rdev->supply) | |
cb3543cf | 1005 | input_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
57776617 JP |
1006 | if (input_uV <= 0) |
1007 | input_uV = rdev->constraints->input_uV; | |
55841199 DA |
1008 | |
1009 | /* | |
1010 | * Don't return an error; if regulator driver cares about | |
1011 | * input_uV then it's up to the driver to validate. | |
1012 | */ | |
1013 | if (input_uV <= 0) | |
1014 | rdev_dbg(rdev, "invalid input voltage found\n"); | |
57776617 | 1015 | |
8f4490e0 BA |
1016 | /* now get the optimum mode for our new total regulator load */ |
1017 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
1018 | output_uV, current_uA); | |
1019 | ||
1020 | /* check the new mode is allowed */ | |
1021 | err = regulator_mode_constrain(rdev, &mode); | |
1022 | if (err < 0) { | |
61aab5ad MM |
1023 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n", |
1024 | current_uA, input_uV, output_uV, ERR_PTR(err)); | |
8f4490e0 BA |
1025 | return err; |
1026 | } | |
414c70cb | 1027 | |
8f4490e0 BA |
1028 | err = rdev->desc->ops->set_mode(rdev, mode); |
1029 | if (err < 0) | |
61aab5ad MM |
1030 | rdev_err(rdev, "failed to set optimum mode %x: %pe\n", |
1031 | mode, ERR_PTR(err)); | |
8460ef38 BA |
1032 | } |
1033 | ||
8460ef38 | 1034 | return err; |
414c70cb LG |
1035 | } |
1036 | ||
0955f5be SB |
1037 | static int __suspend_set_state(struct regulator_dev *rdev, |
1038 | const struct regulator_state *rstate) | |
414c70cb LG |
1039 | { |
1040 | int ret = 0; | |
638f85c5 | 1041 | |
72069f99 CZ |
1042 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1043 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1044 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1045 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1046 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1047 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1048 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1049 | ret = 0; | |
1050 | ||
414c70cb | 1051 | if (ret < 0) { |
61aab5ad | 1052 | rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1053 | return ret; |
1054 | } | |
1055 | ||
1056 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1057 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1058 | if (ret < 0) { | |
61aab5ad | 1059 | rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1060 | return ret; |
1061 | } | |
1062 | } | |
1063 | ||
1064 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1065 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1066 | if (ret < 0) { | |
61aab5ad | 1067 | rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1068 | return ret; |
1069 | } | |
1070 | } | |
414c70cb | 1071 | |
f7efad10 | 1072 | return ret; |
414c70cb LG |
1073 | } |
1074 | ||
0955f5be SB |
1075 | static int suspend_set_initial_state(struct regulator_dev *rdev) |
1076 | { | |
1077 | const struct regulator_state *rstate; | |
1078 | ||
1079 | rstate = regulator_get_suspend_state_check(rdev, | |
1080 | rdev->constraints->initial_state); | |
1081 | if (!rstate) | |
1082 | return 0; | |
1083 | ||
1084 | return __suspend_set_state(rdev, rstate); | |
1085 | } | |
1086 | ||
c845f21a GU |
1087 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
1088 | static void print_constraints_debug(struct regulator_dev *rdev) | |
414c70cb LG |
1089 | { |
1090 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1091 | char buf[160] = ""; |
5751a99f | 1092 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1093 | int count = 0; |
1094 | int ret; | |
414c70cb | 1095 | |
8f031b48 | 1096 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1097 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1098 | count += scnprintf(buf + count, len - count, "%d mV ", |
1099 | constraints->min_uV / 1000); | |
414c70cb | 1100 | else |
5751a99f SW |
1101 | count += scnprintf(buf + count, len - count, |
1102 | "%d <--> %d mV ", | |
1103 | constraints->min_uV / 1000, | |
1104 | constraints->max_uV / 1000); | |
8f031b48 MB |
1105 | } |
1106 | ||
1107 | if (!constraints->min_uV || | |
1108 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1109 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1110 | if (ret > 0) |
5751a99f SW |
1111 | count += scnprintf(buf + count, len - count, |
1112 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1113 | } |
1114 | ||
bf5892a8 | 1115 | if (constraints->uV_offset) |
5751a99f SW |
1116 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1117 | constraints->uV_offset / 1000); | |
bf5892a8 | 1118 | |
8f031b48 | 1119 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1120 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1121 | count += scnprintf(buf + count, len - count, "%d mA ", |
1122 | constraints->min_uA / 1000); | |
414c70cb | 1123 | else |
5751a99f SW |
1124 | count += scnprintf(buf + count, len - count, |
1125 | "%d <--> %d mA ", | |
1126 | constraints->min_uA / 1000, | |
1127 | constraints->max_uA / 1000); | |
8f031b48 MB |
1128 | } |
1129 | ||
1130 | if (!constraints->min_uA || | |
1131 | constraints->min_uA != constraints->max_uA) { | |
1132 | ret = _regulator_get_current_limit(rdev); | |
1133 | if (ret > 0) | |
5751a99f SW |
1134 | count += scnprintf(buf + count, len - count, |
1135 | "at %d mA ", ret / 1000); | |
414c70cb | 1136 | } |
8f031b48 | 1137 | |
414c70cb | 1138 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1139 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1140 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1141 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1142 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1143 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1144 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
99ad5f6e | 1145 | count += scnprintf(buf + count, len - count, "standby "); |
414c70cb | 1146 | |
215b8b05 | 1147 | if (!count) |
99ad5f6e MM |
1148 | count = scnprintf(buf, len, "no parameters"); |
1149 | else | |
1150 | --count; | |
1151 | ||
1152 | count += scnprintf(buf + count, len - count, ", %s", | |
1153 | _regulator_is_enabled(rdev) ? "enabled" : "disabled"); | |
215b8b05 | 1154 | |
194dbaef | 1155 | rdev_dbg(rdev, "%s\n", buf); |
c845f21a GU |
1156 | } |
1157 | #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1158 | static inline void print_constraints_debug(struct regulator_dev *rdev) {} | |
1159 | #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1160 | ||
1161 | static void print_constraints(struct regulator_dev *rdev) | |
1162 | { | |
1163 | struct regulation_constraints *constraints = rdev->constraints; | |
1164 | ||
1165 | print_constraints_debug(rdev); | |
4a682922 MB |
1166 | |
1167 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1168 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1169 | rdev_warn(rdev, |
1170 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1171 | } |
1172 | ||
e79055d6 | 1173 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1174 | struct regulation_constraints *constraints) |
a5766f11 | 1175 | { |
272e2315 | 1176 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1177 | int ret; |
1178 | ||
1179 | /* do we need to apply the constraint voltage */ | |
1180 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1181 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1182 | int target_min, target_max; | |
d22b85a1 | 1183 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1184 | |
1185 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1186 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1187 | rdev_info(rdev, "Setting %d-%duV\n", |
1188 | rdev->constraints->min_uV, | |
1189 | rdev->constraints->max_uV); | |
1190 | _regulator_do_set_voltage(rdev, | |
1191 | rdev->constraints->min_uV, | |
1192 | rdev->constraints->max_uV); | |
d22b85a1 | 1193 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1194 | } |
1195 | ||
064d5cd1 | 1196 | if (current_uV < 0) { |
adea2831 BN |
1197 | if (current_uV != -EPROBE_DEFER) |
1198 | rdev_err(rdev, | |
1199 | "failed to get the current voltage: %pe\n", | |
1200 | ERR_PTR(current_uV)); | |
064d5cd1 AB |
1201 | return current_uV; |
1202 | } | |
fa93fd4e MB |
1203 | |
1204 | /* | |
1205 | * If we're below the minimum voltage move up to the | |
1206 | * minimum voltage, if we're above the maximum voltage | |
1207 | * then move down to the maximum. | |
1208 | */ | |
1209 | target_min = current_uV; | |
1210 | target_max = current_uV; | |
1211 | ||
1212 | if (current_uV < rdev->constraints->min_uV) { | |
1213 | target_min = rdev->constraints->min_uV; | |
1214 | target_max = rdev->constraints->min_uV; | |
1215 | } | |
1216 | ||
1217 | if (current_uV > rdev->constraints->max_uV) { | |
1218 | target_min = rdev->constraints->max_uV; | |
1219 | target_max = rdev->constraints->max_uV; | |
1220 | } | |
1221 | ||
1222 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1223 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1224 | current_uV, target_min, target_max); | |
064d5cd1 | 1225 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1226 | rdev, target_min, target_max); |
064d5cd1 AB |
1227 | if (ret < 0) { |
1228 | rdev_err(rdev, | |
61aab5ad MM |
1229 | "failed to apply %d-%duV constraint: %pe\n", |
1230 | target_min, target_max, ERR_PTR(ret)); | |
064d5cd1 AB |
1231 | return ret; |
1232 | } | |
75790251 | 1233 | } |
af5866c9 | 1234 | } |
e06f5b4f | 1235 | |
4367cfdc DB |
1236 | /* constrain machine-level voltage specs to fit |
1237 | * the actual range supported by this regulator. | |
1238 | */ | |
1239 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1240 | int count = rdev->desc->n_voltages; | |
1241 | int i; | |
1242 | int min_uV = INT_MAX; | |
1243 | int max_uV = INT_MIN; | |
1244 | int cmin = constraints->min_uV; | |
1245 | int cmax = constraints->max_uV; | |
1246 | ||
3e590918 | 1247 | /* it's safe to autoconfigure fixed-voltage supplies |
69b8821e SK |
1248 | * and the constraints are used by list_voltage. |
1249 | */ | |
4367cfdc | 1250 | if (count == 1 && !cmin) { |
3e590918 | 1251 | cmin = 1; |
4367cfdc | 1252 | cmax = INT_MAX; |
3e590918 MB |
1253 | constraints->min_uV = cmin; |
1254 | constraints->max_uV = cmax; | |
4367cfdc DB |
1255 | } |
1256 | ||
3e2b9abd MB |
1257 | /* voltage constraints are optional */ |
1258 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1259 | return 0; |
3e2b9abd | 1260 | |
4367cfdc | 1261 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1262 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1263 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1264 | return -EINVAL; |
4367cfdc DB |
1265 | } |
1266 | ||
6d30fc51 CM |
1267 | /* no need to loop voltages if range is continuous */ |
1268 | if (rdev->desc->continuous_voltage_range) | |
1269 | return 0; | |
1270 | ||
4367cfdc DB |
1271 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1272 | for (i = 0; i < count; i++) { | |
1273 | int value; | |
1274 | ||
1275 | value = ops->list_voltage(rdev, i); | |
1276 | if (value <= 0) | |
1277 | continue; | |
1278 | ||
1279 | /* maybe adjust [min_uV..max_uV] */ | |
1280 | if (value >= cmin && value < min_uV) | |
1281 | min_uV = value; | |
1282 | if (value <= cmax && value > max_uV) | |
1283 | max_uV = value; | |
1284 | } | |
1285 | ||
1286 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1287 | if (max_uV < min_uV) { | |
fff15bef MB |
1288 | rdev_err(rdev, |
1289 | "unsupportable voltage constraints %u-%uuV\n", | |
1290 | min_uV, max_uV); | |
e79055d6 | 1291 | return -EINVAL; |
4367cfdc DB |
1292 | } |
1293 | ||
1294 | /* use regulator's subset of machine constraints */ | |
1295 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1296 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1297 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1298 | constraints->min_uV = min_uV; |
1299 | } | |
1300 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1301 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1302 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1303 | constraints->max_uV = max_uV; |
1304 | } | |
1305 | } | |
1306 | ||
e79055d6 MB |
1307 | return 0; |
1308 | } | |
1309 | ||
f8c1700d LD |
1310 | static int machine_constraints_current(struct regulator_dev *rdev, |
1311 | struct regulation_constraints *constraints) | |
1312 | { | |
272e2315 | 1313 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1314 | int ret; |
1315 | ||
1316 | if (!constraints->min_uA && !constraints->max_uA) | |
1317 | return 0; | |
1318 | ||
1319 | if (constraints->min_uA > constraints->max_uA) { | |
1320 | rdev_err(rdev, "Invalid current constraints\n"); | |
1321 | return -EINVAL; | |
1322 | } | |
1323 | ||
1324 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1325 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | /* Set regulator current in constraints range */ | |
1330 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1331 | constraints->max_uA); | |
1332 | if (ret < 0) { | |
1333 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1334 | return ret; | |
1335 | } | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | ||
30c21971 MP |
1340 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1341 | ||
89a6a5e5 MV |
1342 | static int notif_set_limit(struct regulator_dev *rdev, |
1343 | int (*set)(struct regulator_dev *, int, int, bool), | |
1344 | int limit, int severity) | |
1345 | { | |
1346 | bool enable; | |
1347 | ||
1348 | if (limit == REGULATOR_NOTIF_LIMIT_DISABLE) { | |
1349 | enable = false; | |
1350 | limit = 0; | |
1351 | } else { | |
1352 | enable = true; | |
1353 | } | |
1354 | ||
1355 | if (limit == REGULATOR_NOTIF_LIMIT_ENABLE) | |
1356 | limit = 0; | |
1357 | ||
1358 | return set(rdev, limit, severity, enable); | |
1359 | } | |
1360 | ||
1361 | static int handle_notify_limits(struct regulator_dev *rdev, | |
1362 | int (*set)(struct regulator_dev *, int, int, bool), | |
1363 | struct notification_limit *limits) | |
1364 | { | |
1365 | int ret = 0; | |
1366 | ||
1367 | if (!set) | |
1368 | return -EOPNOTSUPP; | |
1369 | ||
1370 | if (limits->prot) | |
1371 | ret = notif_set_limit(rdev, set, limits->prot, | |
1372 | REGULATOR_SEVERITY_PROT); | |
1373 | if (ret) | |
1374 | return ret; | |
1375 | ||
1376 | if (limits->err) | |
1377 | ret = notif_set_limit(rdev, set, limits->err, | |
1378 | REGULATOR_SEVERITY_ERR); | |
1379 | if (ret) | |
1380 | return ret; | |
1381 | ||
1382 | if (limits->warn) | |
1383 | ret = notif_set_limit(rdev, set, limits->warn, | |
1384 | REGULATOR_SEVERITY_WARN); | |
1385 | ||
1386 | return ret; | |
1387 | } | |
e79055d6 MB |
1388 | /** |
1389 | * set_machine_constraints - sets regulator constraints | |
1390 | * @rdev: regulator source | |
e79055d6 MB |
1391 | * |
1392 | * Allows platform initialisation code to define and constrain | |
1393 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1394 | * Constraints *must* be set by platform code in order for some | |
1395 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1396 | * set_mode. | |
1397 | */ | |
57a6ad48 | 1398 | static int set_machine_constraints(struct regulator_dev *rdev) |
e79055d6 MB |
1399 | { |
1400 | int ret = 0; | |
272e2315 | 1401 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1402 | |
f8c12fe3 | 1403 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1404 | if (ret != 0) |
6333ef46 | 1405 | return ret; |
e79055d6 | 1406 | |
f8c1700d | 1407 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1408 | if (ret != 0) |
6333ef46 | 1409 | return ret; |
e79055d6 | 1410 | |
36e4f839 SB |
1411 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1412 | ret = ops->set_input_current_limit(rdev, | |
1413 | rdev->constraints->ilim_uA); | |
1414 | if (ret < 0) { | |
61aab5ad | 1415 | rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1416 | return ret; |
36e4f839 SB |
1417 | } |
1418 | } | |
1419 | ||
a5766f11 | 1420 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1421 | if (rdev->constraints->initial_state) { |
0955f5be | 1422 | ret = suspend_set_initial_state(rdev); |
e06f5b4f | 1423 | if (ret < 0) { |
61aab5ad | 1424 | rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1425 | return ret; |
e06f5b4f MB |
1426 | } |
1427 | } | |
a5766f11 | 1428 | |
9a8f5e07 | 1429 | if (rdev->constraints->initial_mode) { |
a308466c | 1430 | if (!ops->set_mode) { |
5da84fd9 | 1431 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1432 | return -EINVAL; |
a308466c MB |
1433 | } |
1434 | ||
f8c12fe3 | 1435 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1436 | if (ret < 0) { |
61aab5ad | 1437 | rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1438 | return ret; |
a308466c | 1439 | } |
fa94e48e DA |
1440 | } else if (rdev->constraints->system_load) { |
1441 | /* | |
1442 | * We'll only apply the initial system load if an | |
1443 | * initial mode wasn't specified. | |
1444 | */ | |
1445 | drms_uA_update(rdev); | |
a308466c MB |
1446 | } |
1447 | ||
1653ccf4 YSB |
1448 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1449 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1450 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1451 | if (ret < 0) { | |
61aab5ad | 1452 | rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1453 | return ret; |
6f0b2c69 YSB |
1454 | } |
1455 | } | |
1456 | ||
23c779b9 SB |
1457 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1458 | ret = ops->set_pull_down(rdev); | |
1459 | if (ret < 0) { | |
61aab5ad | 1460 | rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1461 | return ret; |
23c779b9 SB |
1462 | } |
1463 | } | |
1464 | ||
57f66b78 SB |
1465 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1466 | ret = ops->set_soft_start(rdev); | |
1467 | if (ret < 0) { | |
61aab5ad | 1468 | rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1469 | return ret; |
57f66b78 SB |
1470 | } |
1471 | } | |
1472 | ||
89a6a5e5 MV |
1473 | /* |
1474 | * Existing logic does not warn if over_current_protection is given as | |
1475 | * a constraint but driver does not support that. I think we should | |
1476 | * warn about this type of issues as it is possible someone changes | |
1477 | * PMIC on board to another type - and the another PMIC's driver does | |
1478 | * not support setting protection. Board composer may happily believe | |
1479 | * the DT limits are respected - especially if the new PMIC HW also | |
1480 | * supports protection but the driver does not. I won't change the logic | |
1481 | * without hearing more experienced opinion on this though. | |
1482 | * | |
1483 | * If warning is seen as a good idea then we can merge handling the | |
1484 | * over-curret protection and detection and get rid of this special | |
1485 | * handling. | |
1486 | */ | |
3a003bae SB |
1487 | if (rdev->constraints->over_current_protection |
1488 | && ops->set_over_current_protection) { | |
89a6a5e5 MV |
1489 | int lim = rdev->constraints->over_curr_limits.prot; |
1490 | ||
1491 | ret = ops->set_over_current_protection(rdev, lim, | |
1492 | REGULATOR_SEVERITY_PROT, | |
1493 | true); | |
3a003bae | 1494 | if (ret < 0) { |
61aab5ad MM |
1495 | rdev_err(rdev, "failed to set over current protection: %pe\n", |
1496 | ERR_PTR(ret)); | |
6333ef46 | 1497 | return ret; |
3a003bae SB |
1498 | } |
1499 | } | |
1500 | ||
89a6a5e5 MV |
1501 | if (rdev->constraints->over_current_detection) |
1502 | ret = handle_notify_limits(rdev, | |
1503 | ops->set_over_current_protection, | |
1504 | &rdev->constraints->over_curr_limits); | |
1505 | if (ret) { | |
1506 | if (ret != -EOPNOTSUPP) { | |
1507 | rdev_err(rdev, "failed to set over current limits: %pe\n", | |
1508 | ERR_PTR(ret)); | |
1509 | return ret; | |
1510 | } | |
1511 | rdev_warn(rdev, | |
1512 | "IC does not support requested over-current limits\n"); | |
1513 | } | |
1514 | ||
1515 | if (rdev->constraints->over_voltage_detection) | |
1516 | ret = handle_notify_limits(rdev, | |
1517 | ops->set_over_voltage_protection, | |
1518 | &rdev->constraints->over_voltage_limits); | |
1519 | if (ret) { | |
1520 | if (ret != -EOPNOTSUPP) { | |
1521 | rdev_err(rdev, "failed to set over voltage limits %pe\n", | |
1522 | ERR_PTR(ret)); | |
1523 | return ret; | |
1524 | } | |
1525 | rdev_warn(rdev, | |
1526 | "IC does not support requested over voltage limits\n"); | |
1527 | } | |
1528 | ||
1529 | if (rdev->constraints->under_voltage_detection) | |
1530 | ret = handle_notify_limits(rdev, | |
1531 | ops->set_under_voltage_protection, | |
1532 | &rdev->constraints->under_voltage_limits); | |
1533 | if (ret) { | |
1534 | if (ret != -EOPNOTSUPP) { | |
1535 | rdev_err(rdev, "failed to set under voltage limits %pe\n", | |
1536 | ERR_PTR(ret)); | |
1537 | return ret; | |
1538 | } | |
1539 | rdev_warn(rdev, | |
1540 | "IC does not support requested under voltage limits\n"); | |
1541 | } | |
1542 | ||
1543 | if (rdev->constraints->over_temp_detection) | |
1544 | ret = handle_notify_limits(rdev, | |
1545 | ops->set_thermal_protection, | |
1546 | &rdev->constraints->temp_limits); | |
1547 | if (ret) { | |
1548 | if (ret != -EOPNOTSUPP) { | |
1549 | rdev_err(rdev, "failed to set temperature limits %pe\n", | |
1550 | ERR_PTR(ret)); | |
1551 | return ret; | |
1552 | } | |
1553 | rdev_warn(rdev, | |
1554 | "IC does not support requested temperature limits\n"); | |
1555 | } | |
1556 | ||
670666b9 LD |
1557 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1558 | bool ad_state = (rdev->constraints->active_discharge == | |
1559 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1560 | ||
1561 | ret = ops->set_active_discharge(rdev, ad_state); | |
1562 | if (ret < 0) { | |
61aab5ad | 1563 | rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret)); |
670666b9 LD |
1564 | return ret; |
1565 | } | |
1566 | } | |
1567 | ||
261f0631 MB |
1568 | /* |
1569 | * If there is no mechanism for controlling the regulator then | |
1570 | * flag it as always_on so we don't end up duplicating checks | |
1571 | * for this so much. Note that we could control the state of | |
1572 | * a supply to control the output on a regulator that has no | |
1573 | * direct control. | |
1574 | */ | |
1575 | if (!rdev->ena_pin && !ops->enable) { | |
1576 | if (rdev->supply_name && !rdev->supply) | |
1577 | return -EPROBE_DEFER; | |
1578 | ||
1579 | if (rdev->supply) | |
1580 | rdev->constraints->always_on = | |
1581 | rdev->supply->rdev->constraints->always_on; | |
1582 | else | |
1583 | rdev->constraints->always_on = true; | |
1584 | } | |
1585 | ||
218320fe CK |
1586 | if (rdev->desc->off_on_delay) |
1587 | rdev->last_off = ktime_get(); | |
1588 | ||
2bb16663 OS |
1589 | /* If the constraints say the regulator should be on at this point |
1590 | * and we have control then make sure it is enabled. | |
1591 | */ | |
1592 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
98e48cd9 DB |
1593 | /* If we want to enable this regulator, make sure that we know |
1594 | * the supplying regulator. | |
1595 | */ | |
1596 | if (rdev->supply_name && !rdev->supply) | |
1597 | return -EPROBE_DEFER; | |
1598 | ||
0591b14c RZ |
1599 | /* If supplying regulator has already been enabled, |
1600 | * it's not intended to have use_count increment | |
1601 | * when rdev is only boot-on. | |
1602 | */ | |
1603 | if (rdev->supply && | |
1604 | (rdev->constraints->always_on || | |
1605 | !regulator_is_enabled(rdev->supply))) { | |
05f224ca DA |
1606 | ret = regulator_enable(rdev->supply); |
1607 | if (ret < 0) { | |
1608 | _regulator_put(rdev->supply); | |
1609 | rdev->supply = NULL; | |
1610 | return ret; | |
1611 | } | |
1612 | } | |
1613 | ||
2bb16663 OS |
1614 | ret = _regulator_do_enable(rdev); |
1615 | if (ret < 0 && ret != -EINVAL) { | |
61aab5ad | 1616 | rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret)); |
2bb16663 OS |
1617 | return ret; |
1618 | } | |
089b3f61 PP |
1619 | |
1620 | if (rdev->constraints->always_on) | |
1621 | rdev->use_count++; | |
2bb16663 OS |
1622 | } |
1623 | ||
a5766f11 | 1624 | print_constraints(rdev); |
1a6958e7 | 1625 | return 0; |
a5766f11 LG |
1626 | } |
1627 | ||
1628 | /** | |
1629 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1630 | * @rdev: regulator name |
1631 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1632 | * |
1633 | * Called by platform initialisation code to set the supply regulator for this | |
1634 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1635 | * core if it's child is enabled. | |
1636 | */ | |
1637 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1638 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1639 | { |
1640 | int err; | |
1641 | ||
35d11469 | 1642 | rdev_dbg(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
3801b86a | 1643 | |
e2c09ae7 JMC |
1644 | if (!try_module_get(supply_rdev->owner)) |
1645 | return -ENODEV; | |
1646 | ||
3801b86a | 1647 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 | 1648 | if (rdev->supply == NULL) { |
da46ee19 | 1649 | module_put(supply_rdev->owner); |
32c78de8 | 1650 | err = -ENOMEM; |
3801b86a | 1651 | return err; |
a5766f11 | 1652 | } |
57ad526a | 1653 | supply_rdev->open_count++; |
3801b86a MB |
1654 | |
1655 | return 0; | |
a5766f11 LG |
1656 | } |
1657 | ||
1658 | /** | |
06c63f93 | 1659 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1660 | * @rdev: regulator source |
40f9244f | 1661 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1662 | * @supply: symbolic name for supply |
a5766f11 LG |
1663 | * |
1664 | * Allows platform initialisation code to map physical regulator | |
1665 | * sources to symbolic names for supplies for use by devices. Devices | |
1666 | * should use these symbolic names to request regulators, avoiding the | |
1667 | * need to provide board-specific regulator names as platform data. | |
1668 | */ | |
1669 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1670 | const char *consumer_dev_name, |
1671 | const char *supply) | |
a5766f11 | 1672 | { |
5c065401 | 1673 | struct regulator_map *node, *new_node; |
9ed2099e | 1674 | int has_dev; |
a5766f11 LG |
1675 | |
1676 | if (supply == NULL) | |
1677 | return -EINVAL; | |
1678 | ||
9ed2099e MB |
1679 | if (consumer_dev_name != NULL) |
1680 | has_dev = 1; | |
1681 | else | |
1682 | has_dev = 0; | |
1683 | ||
5c065401 MM |
1684 | new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1685 | if (new_node == NULL) | |
1686 | return -ENOMEM; | |
1687 | ||
1688 | new_node->regulator = rdev; | |
1689 | new_node->supply = supply; | |
1690 | ||
1691 | if (has_dev) { | |
1692 | new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1693 | if (new_node->dev_name == NULL) { | |
1694 | kfree(new_node); | |
1695 | return -ENOMEM; | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | mutex_lock(®ulator_list_mutex); | |
6001e13c | 1700 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1701 | if (node->dev_name && consumer_dev_name) { |
1702 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1703 | continue; | |
1704 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1705 | continue; |
23b5cc2a JN |
1706 | } |
1707 | ||
6001e13c DB |
1708 | if (strcmp(node->supply, supply) != 0) |
1709 | continue; | |
1710 | ||
737f360d MB |
1711 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1712 | consumer_dev_name, | |
1713 | dev_name(&node->regulator->dev), | |
1714 | node->regulator->desc->name, | |
1715 | supply, | |
1716 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
5c065401 | 1717 | goto fail; |
6001e13c DB |
1718 | } |
1719 | ||
5c065401 MM |
1720 | list_add(&new_node->list, ®ulator_map_list); |
1721 | mutex_unlock(®ulator_list_mutex); | |
40f9244f | 1722 | |
a5766f11 | 1723 | return 0; |
5c065401 MM |
1724 | |
1725 | fail: | |
1726 | mutex_unlock(®ulator_list_mutex); | |
1727 | kfree(new_node->dev_name); | |
1728 | kfree(new_node); | |
1729 | return -EBUSY; | |
a5766f11 LG |
1730 | } |
1731 | ||
0f1d747b MR |
1732 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1733 | { | |
1734 | struct regulator_map *node, *n; | |
1735 | ||
1736 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1737 | if (rdev == node->regulator) { | |
1738 | list_del(&node->list); | |
40f9244f | 1739 | kfree(node->dev_name); |
0f1d747b | 1740 | kfree(node); |
0f1d747b MR |
1741 | } |
1742 | } | |
1743 | } | |
1744 | ||
2d80a91b RF |
1745 | #ifdef CONFIG_DEBUG_FS |
1746 | static ssize_t constraint_flags_read_file(struct file *file, | |
1747 | char __user *user_buf, | |
1748 | size_t count, loff_t *ppos) | |
1749 | { | |
1750 | const struct regulator *regulator = file->private_data; | |
1751 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1752 | char *buf; | |
1753 | ssize_t ret; | |
1754 | ||
1755 | if (!c) | |
1756 | return 0; | |
1757 | ||
1758 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1759 | if (!buf) | |
1760 | return -ENOMEM; | |
1761 | ||
1762 | ret = snprintf(buf, PAGE_SIZE, | |
1763 | "always_on: %u\n" | |
1764 | "boot_on: %u\n" | |
1765 | "apply_uV: %u\n" | |
1766 | "ramp_disable: %u\n" | |
1767 | "soft_start: %u\n" | |
1768 | "pull_down: %u\n" | |
1769 | "over_current_protection: %u\n", | |
1770 | c->always_on, | |
1771 | c->boot_on, | |
1772 | c->apply_uV, | |
1773 | c->ramp_disable, | |
1774 | c->soft_start, | |
1775 | c->pull_down, | |
1776 | c->over_current_protection); | |
1777 | ||
1778 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1779 | kfree(buf); | |
1780 | ||
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | #endif | |
1785 | ||
1786 | static const struct file_operations constraint_flags_fops = { | |
1787 | #ifdef CONFIG_DEBUG_FS | |
1788 | .open = simple_open, | |
1789 | .read = constraint_flags_read_file, | |
1790 | .llseek = default_llseek, | |
1791 | #endif | |
1792 | }; | |
1793 | ||
f5726ae3 | 1794 | #define REG_STR_SIZE 64 |
414c70cb LG |
1795 | |
1796 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1797 | struct device *dev, | |
1798 | const char *supply_name) | |
1799 | { | |
1800 | struct regulator *regulator; | |
dbe954d8 | 1801 | int err = 0; |
87fe29b6 MM |
1802 | |
1803 | if (dev) { | |
1804 | char buf[REG_STR_SIZE]; | |
1805 | int size; | |
1806 | ||
1807 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", | |
1808 | dev->kobj.name, supply_name); | |
1809 | if (size >= REG_STR_SIZE) | |
1810 | return NULL; | |
1811 | ||
1812 | supply_name = kstrdup(buf, GFP_KERNEL); | |
1813 | if (supply_name == NULL) | |
1814 | return NULL; | |
1815 | } else { | |
1816 | supply_name = kstrdup_const(supply_name, GFP_KERNEL); | |
1817 | if (supply_name == NULL) | |
1818 | return NULL; | |
1819 | } | |
414c70cb LG |
1820 | |
1821 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
87fe29b6 | 1822 | if (regulator == NULL) { |
dc8d006d | 1823 | kfree_const(supply_name); |
414c70cb | 1824 | return NULL; |
87fe29b6 | 1825 | } |
414c70cb | 1826 | |
414c70cb | 1827 | regulator->rdev = rdev; |
87fe29b6 MM |
1828 | regulator->supply_name = supply_name; |
1829 | ||
1830 | regulator_lock(rdev); | |
414c70cb | 1831 | list_add(®ulator->list, &rdev->consumer_list); |
87fe29b6 | 1832 | regulator_unlock(rdev); |
414c70cb LG |
1833 | |
1834 | if (dev) { | |
e2c98eaf SG |
1835 | regulator->dev = dev; |
1836 | ||
222cc7b1 | 1837 | /* Add a link to the device sysfs entry */ |
ff268b56 | 1838 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
87fe29b6 | 1839 | supply_name); |
414c70cb | 1840 | if (err) { |
61aab5ad MM |
1841 | rdev_dbg(rdev, "could not add device link %s: %pe\n", |
1842 | dev->kobj.name, ERR_PTR(err)); | |
222cc7b1 | 1843 | /* non-fatal */ |
414c70cb | 1844 | } |
5de70519 MB |
1845 | } |
1846 | ||
dbe954d8 HG |
1847 | if (err != -EEXIST) |
1848 | regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); | |
24751434 | 1849 | if (!regulator->debugfs) { |
ad3a942b | 1850 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1851 | } else { |
1852 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1853 | ®ulator->uA_load); | |
1854 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1855 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1856 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1857 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1858 | debugfs_create_file("constraint_flags", 0444, |
1859 | regulator->debugfs, regulator, | |
1860 | &constraint_flags_fops); | |
414c70cb | 1861 | } |
5de70519 | 1862 | |
6492bc1b MB |
1863 | /* |
1864 | * Check now if the regulator is an always on regulator - if | |
1865 | * it is then we don't need to do nearly so much work for | |
1866 | * enable/disable calls. | |
1867 | */ | |
8a34e979 | 1868 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1869 | _regulator_is_enabled(rdev)) |
1870 | regulator->always_on = true; | |
1871 | ||
414c70cb | 1872 | return regulator; |
414c70cb LG |
1873 | } |
1874 | ||
31aae2be MB |
1875 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1876 | { | |
00c877c6 LD |
1877 | if (rdev->constraints && rdev->constraints->enable_time) |
1878 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1879 | if (rdev->desc->ops->enable_time) |
1880 | return rdev->desc->ops->enable_time(rdev); | |
1881 | return rdev->desc->enable_time; | |
31aae2be MB |
1882 | } |
1883 | ||
a06ccd9c CK |
1884 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1885 | struct device *dev, const char *supply) | |
1886 | { | |
1887 | struct regulator_supply_alias *map; | |
1888 | ||
1889 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1890 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1891 | return map; | |
1892 | ||
1893 | return NULL; | |
1894 | } | |
1895 | ||
1896 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1897 | { | |
1898 | struct regulator_supply_alias *map; | |
1899 | ||
1900 | map = regulator_find_supply_alias(*dev, *supply); | |
1901 | if (map) { | |
1902 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1903 | *supply, map->alias_supply, | |
1904 | dev_name(map->alias_dev)); | |
1905 | *dev = map->alias_dev; | |
1906 | *supply = map->alias_supply; | |
1907 | } | |
1908 | } | |
1909 | ||
85f3b431 TV |
1910 | static int regulator_match(struct device *dev, const void *data) |
1911 | { | |
1912 | struct regulator_dev *r = dev_to_rdev(dev); | |
1913 | ||
1914 | return strcmp(rdev_get_name(r), data) == 0; | |
1915 | } | |
1916 | ||
1917 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1918 | { | |
1919 | struct device *dev; | |
1920 | ||
1921 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1922 | ||
1923 | return dev ? dev_to_rdev(dev) : NULL; | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * regulator_dev_lookup - lookup a regulator device. | |
1928 | * @dev: device for regulator "consumer". | |
1929 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1930 | * |
1931 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1932 | * @supply and with the embedded struct device refcount incremented by one. |
1933 | * The refcount must be dropped by calling put_device(). | |
1934 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1935 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1936 | * in the future. | |
85f3b431 | 1937 | */ |
69511a45 | 1938 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1939 | const char *supply) |
69511a45 | 1940 | { |
06217197 | 1941 | struct regulator_dev *r = NULL; |
69511a45 | 1942 | struct device_node *node; |
576ca436 MB |
1943 | struct regulator_map *map; |
1944 | const char *devname = NULL; | |
69511a45 | 1945 | |
a06ccd9c CK |
1946 | regulator_supply_alias(&dev, &supply); |
1947 | ||
69511a45 RN |
1948 | /* first do a dt based lookup */ |
1949 | if (dev && dev->of_node) { | |
1950 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1951 | if (node) { |
85f3b431 | 1952 | r = of_find_regulator_by_node(node); |
f2b41b74 | 1953 | of_node_put(node); |
85f3b431 TV |
1954 | if (r) |
1955 | return r; | |
163478da | 1956 | |
6d191a5f | 1957 | /* |
163478da DT |
1958 | * We have a node, but there is no device. |
1959 | * assume it has not registered yet. | |
6d191a5f | 1960 | */ |
163478da | 1961 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1962 | } |
69511a45 RN |
1963 | } |
1964 | ||
1965 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1966 | if (dev) |
1967 | devname = dev_name(dev); | |
1968 | ||
85f3b431 | 1969 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1970 | list_for_each_entry(map, ®ulator_map_list, list) { |
1971 | /* If the mapping has a device set up it must match */ | |
1972 | if (map->dev_name && | |
1973 | (!devname || strcmp(map->dev_name, devname))) | |
1974 | continue; | |
1975 | ||
85f3b431 TV |
1976 | if (strcmp(map->supply, supply) == 0 && |
1977 | get_device(&map->regulator->dev)) { | |
163478da DT |
1978 | r = map->regulator; |
1979 | break; | |
85f3b431 | 1980 | } |
576ca436 | 1981 | } |
85f3b431 | 1982 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1983 | |
06217197 CK |
1984 | if (r) |
1985 | return r; | |
1986 | ||
1987 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1988 | if (r) |
1989 | return r; | |
1990 | ||
1991 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1992 | } |
1993 | ||
6261b06d BA |
1994 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1995 | { | |
1996 | struct regulator_dev *r; | |
1997 | struct device *dev = rdev->dev.parent; | |
eaa7995c | 1998 | int ret = 0; |
6261b06d | 1999 | |
48f1b4ef | 2000 | /* No supply to resolve? */ |
6261b06d BA |
2001 | if (!rdev->supply_name) |
2002 | return 0; | |
2003 | ||
eaa7995c | 2004 | /* Supply already resolved? (fast-path without locking contention) */ |
6261b06d BA |
2005 | if (rdev->supply) |
2006 | return 0; | |
2007 | ||
163478da DT |
2008 | r = regulator_dev_lookup(dev, rdev->supply_name); |
2009 | if (IS_ERR(r)) { | |
2010 | ret = PTR_ERR(r); | |
2011 | ||
06423121 MB |
2012 | /* Did the lookup explicitly defer for us? */ |
2013 | if (ret == -EPROBE_DEFER) | |
eaa7995c | 2014 | goto out; |
06423121 | 2015 | |
9f7e25ed MB |
2016 | if (have_full_constraints()) { |
2017 | r = dummy_regulator_rdev; | |
85f3b431 | 2018 | get_device(&r->dev); |
9f7e25ed MB |
2019 | } else { |
2020 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
2021 | rdev->supply_name, rdev->desc->name); | |
eaa7995c DC |
2022 | ret = -EPROBE_DEFER; |
2023 | goto out; | |
9f7e25ed | 2024 | } |
6261b06d BA |
2025 | } |
2026 | ||
4b639e25 MM |
2027 | if (r == rdev) { |
2028 | dev_err(dev, "Supply for %s (%s) resolved to itself\n", | |
2029 | rdev->desc->name, rdev->supply_name); | |
eaa7995c DC |
2030 | if (!have_full_constraints()) { |
2031 | ret = -EINVAL; | |
2032 | goto out; | |
2033 | } | |
f5c042b2 MM |
2034 | r = dummy_regulator_rdev; |
2035 | get_device(&r->dev); | |
4b639e25 MM |
2036 | } |
2037 | ||
66d228a2 JH |
2038 | /* |
2039 | * If the supply's parent device is not the same as the | |
2040 | * regulator's parent device, then ensure the parent device | |
2041 | * is bound before we resolve the supply, in case the parent | |
2042 | * device get probe deferred and unregisters the supply. | |
2043 | */ | |
2044 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
2045 | if (!device_is_bound(r->dev.parent)) { | |
2046 | put_device(&r->dev); | |
eaa7995c DC |
2047 | ret = -EPROBE_DEFER; |
2048 | goto out; | |
66d228a2 JH |
2049 | } |
2050 | } | |
2051 | ||
6261b06d BA |
2052 | /* Recursively resolve the supply of the supply */ |
2053 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
2054 | if (ret < 0) { |
2055 | put_device(&r->dev); | |
eaa7995c | 2056 | goto out; |
85f3b431 | 2057 | } |
6261b06d | 2058 | |
14a71d50 MB |
2059 | /* |
2060 | * Recheck rdev->supply with rdev->mutex lock held to avoid a race | |
2061 | * between rdev->supply null check and setting rdev->supply in | |
2062 | * set_supply() from concurrent tasks. | |
2063 | */ | |
2064 | regulator_lock(rdev); | |
2065 | ||
2066 | /* Supply just resolved by a concurrent task? */ | |
2067 | if (rdev->supply) { | |
2068 | regulator_unlock(rdev); | |
2069 | put_device(&r->dev); | |
2070 | goto out; | |
2071 | } | |
2072 | ||
6261b06d | 2073 | ret = set_supply(rdev, r); |
85f3b431 | 2074 | if (ret < 0) { |
14a71d50 | 2075 | regulator_unlock(rdev); |
85f3b431 | 2076 | put_device(&r->dev); |
eaa7995c | 2077 | goto out; |
85f3b431 | 2078 | } |
6261b06d | 2079 | |
14a71d50 MB |
2080 | regulator_unlock(rdev); |
2081 | ||
05f224ca DA |
2082 | /* |
2083 | * In set_machine_constraints() we may have turned this regulator on | |
2084 | * but we couldn't propagate to the supply if it hadn't been resolved | |
2085 | * yet. Do it now. | |
2086 | */ | |
2087 | if (rdev->use_count) { | |
6261b06d | 2088 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 2089 | if (ret < 0) { |
9f8df6ad | 2090 | _regulator_put(rdev->supply); |
8e5356a7 | 2091 | rdev->supply = NULL; |
eaa7995c | 2092 | goto out; |
36a1f1b6 | 2093 | } |
6261b06d BA |
2094 | } |
2095 | ||
eaa7995c | 2096 | out: |
eaa7995c | 2097 | return ret; |
6261b06d BA |
2098 | } |
2099 | ||
5ffbd136 | 2100 | /* Internal regulator request function */ |
a8bd42a9 DT |
2101 | struct regulator *_regulator_get(struct device *dev, const char *id, |
2102 | enum regulator_get_type get_type) | |
414c70cb LG |
2103 | { |
2104 | struct regulator_dev *rdev; | |
7d245afa | 2105 | struct regulator *regulator; |
b59b6544 | 2106 | struct device_link *link; |
317b5684 | 2107 | int ret; |
414c70cb | 2108 | |
a8bd42a9 DT |
2109 | if (get_type >= MAX_GET_TYPE) { |
2110 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
2111 | return ERR_PTR(-EINVAL); | |
2112 | } | |
2113 | ||
414c70cb | 2114 | if (id == NULL) { |
5da84fd9 | 2115 | pr_err("get() with no identifier\n"); |
043c998f | 2116 | return ERR_PTR(-EINVAL); |
414c70cb LG |
2117 | } |
2118 | ||
163478da | 2119 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
2120 | if (IS_ERR(rdev)) { |
2121 | ret = PTR_ERR(rdev); | |
1e4b545c | 2122 | |
a4d7641f DT |
2123 | /* |
2124 | * If regulator_dev_lookup() fails with error other | |
2125 | * than -ENODEV our job here is done, we simply return it. | |
2126 | */ | |
2127 | if (ret != -ENODEV) | |
2128 | return ERR_PTR(ret); | |
34abbd68 | 2129 | |
a4d7641f DT |
2130 | if (!have_full_constraints()) { |
2131 | dev_warn(dev, | |
2132 | "incomplete constraints, dummy supplies not allowed\n"); | |
2133 | return ERR_PTR(-ENODEV); | |
2134 | } | |
4ddfebd3 | 2135 | |
a4d7641f DT |
2136 | switch (get_type) { |
2137 | case NORMAL_GET: | |
2138 | /* | |
2139 | * Assume that a regulator is physically present and | |
2140 | * enabled, even if it isn't hooked up, and just | |
2141 | * provide a dummy. | |
2142 | */ | |
6e5505cf | 2143 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
2144 | rdev = dummy_regulator_rdev; |
2145 | get_device(&rdev->dev); | |
2146 | break; | |
34abbd68 | 2147 | |
a4d7641f DT |
2148 | case EXCLUSIVE_GET: |
2149 | dev_warn(dev, | |
2150 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 2151 | fallthrough; |
34abbd68 | 2152 | |
a4d7641f DT |
2153 | default: |
2154 | return ERR_PTR(-ENODEV); | |
2155 | } | |
34abbd68 | 2156 | } |
34abbd68 | 2157 | |
5ffbd136 MB |
2158 | if (rdev->exclusive) { |
2159 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
2160 | put_device(&rdev->dev); |
2161 | return regulator; | |
5ffbd136 MB |
2162 | } |
2163 | ||
a8bd42a9 | 2164 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 2165 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
2166 | put_device(&rdev->dev); |
2167 | return regulator; | |
5ffbd136 MB |
2168 | } |
2169 | ||
79d6f049 DO |
2170 | mutex_lock(®ulator_list_mutex); |
2171 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
2172 | mutex_unlock(®ulator_list_mutex); | |
2173 | ||
2174 | if (ret != 0) { | |
2175 | regulator = ERR_PTR(-EPROBE_DEFER); | |
2176 | put_device(&rdev->dev); | |
2177 | return regulator; | |
2178 | } | |
2179 | ||
6261b06d BA |
2180 | ret = regulator_resolve_supply(rdev); |
2181 | if (ret < 0) { | |
2182 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
2183 | put_device(&rdev->dev); |
2184 | return regulator; | |
6261b06d BA |
2185 | } |
2186 | ||
85f3b431 | 2187 | if (!try_module_get(rdev->owner)) { |
7d245afa | 2188 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
2189 | put_device(&rdev->dev); |
2190 | return regulator; | |
2191 | } | |
a5766f11 | 2192 | |
414c70cb LG |
2193 | regulator = create_regulator(rdev, dev, id); |
2194 | if (regulator == NULL) { | |
2195 | regulator = ERR_PTR(-ENOMEM); | |
2196 | module_put(rdev->owner); | |
4affd79a | 2197 | put_device(&rdev->dev); |
85f3b431 | 2198 | return regulator; |
414c70cb LG |
2199 | } |
2200 | ||
5ffbd136 | 2201 | rdev->open_count++; |
a8bd42a9 | 2202 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
2203 | rdev->exclusive = 1; |
2204 | ||
2205 | ret = _regulator_is_enabled(rdev); | |
c3e3ca05 | 2206 | if (ret > 0) { |
5ffbd136 | 2207 | rdev->use_count = 1; |
c3e3ca05 ZW |
2208 | regulator->enable_count = 1; |
2209 | } else { | |
5ffbd136 | 2210 | rdev->use_count = 0; |
c3e3ca05 ZW |
2211 | regulator->enable_count = 0; |
2212 | } | |
5ffbd136 MB |
2213 | } |
2214 | ||
b59b6544 SK |
2215 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
2216 | if (!IS_ERR_OR_NULL(link)) | |
2217 | regulator->device_link = true; | |
ed1ae2dd | 2218 | |
414c70cb LG |
2219 | return regulator; |
2220 | } | |
5ffbd136 MB |
2221 | |
2222 | /** | |
2223 | * regulator_get - lookup and obtain a reference to a regulator. | |
2224 | * @dev: device for regulator "consumer" | |
2225 | * @id: Supply name or regulator ID. | |
2226 | * | |
2227 | * Returns a struct regulator corresponding to the regulator producer, | |
2228 | * or IS_ERR() condition containing errno. | |
2229 | * | |
90cf443d | 2230 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2231 | * strongly encouraged. It is recommended that the supply name used |
2232 | * should match the name used for the supply and/or the relevant | |
2233 | * device pins in the datasheet. | |
2234 | */ | |
2235 | struct regulator *regulator_get(struct device *dev, const char *id) | |
2236 | { | |
a8bd42a9 | 2237 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 2238 | } |
414c70cb LG |
2239 | EXPORT_SYMBOL_GPL(regulator_get); |
2240 | ||
5ffbd136 MB |
2241 | /** |
2242 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
2243 | * @dev: device for regulator "consumer" | |
2244 | * @id: Supply name or regulator ID. | |
2245 | * | |
2246 | * Returns a struct regulator corresponding to the regulator producer, | |
2247 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
2248 | * unable to obtain this regulator while this reference is held and the |
2249 | * use count for the regulator will be initialised to reflect the current | |
2250 | * state of the regulator. | |
5ffbd136 MB |
2251 | * |
2252 | * This is intended for use by consumers which cannot tolerate shared | |
2253 | * use of the regulator such as those which need to force the | |
2254 | * regulator off for correct operation of the hardware they are | |
2255 | * controlling. | |
2256 | * | |
90cf443d | 2257 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2258 | * strongly encouraged. It is recommended that the supply name used |
2259 | * should match the name used for the supply and/or the relevant | |
2260 | * device pins in the datasheet. | |
2261 | */ | |
2262 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2263 | { | |
a8bd42a9 | 2264 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2265 | } |
2266 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2267 | ||
de1dd9fd MB |
2268 | /** |
2269 | * regulator_get_optional - obtain optional access to a regulator. | |
2270 | * @dev: device for regulator "consumer" | |
2271 | * @id: Supply name or regulator ID. | |
2272 | * | |
2273 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2274 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2275 | * |
2276 | * This is intended for use by consumers for devices which can have | |
2277 | * some supplies unconnected in normal use, such as some MMC devices. | |
2278 | * It can allow the regulator core to provide stub supplies for other | |
2279 | * supplies requested using normal regulator_get() calls without | |
2280 | * disrupting the operation of drivers that can handle absent | |
2281 | * supplies. | |
2282 | * | |
90cf443d | 2283 | * Use of supply names configured via set_consumer_device_supply() is |
de1dd9fd MB |
2284 | * strongly encouraged. It is recommended that the supply name used |
2285 | * should match the name used for the supply and/or the relevant | |
2286 | * device pins in the datasheet. | |
2287 | */ | |
2288 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2289 | { | |
a8bd42a9 | 2290 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2291 | } |
2292 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2293 | ||
e1794aa4 | 2294 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2295 | { |
e1794aa4 | 2296 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2297 | |
5de70519 | 2298 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2299 | |
ed1ae2dd | 2300 | if (regulator->dev) { |
b59b6544 SK |
2301 | if (regulator->device_link) |
2302 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2303 | |
2304 | /* remove any sysfs entries */ | |
414c70cb | 2305 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2306 | } |
2307 | ||
66cf9a7e | 2308 | regulator_lock(rdev); |
414c70cb | 2309 | list_del(®ulator->list); |
414c70cb | 2310 | |
5ffbd136 MB |
2311 | rdev->open_count--; |
2312 | rdev->exclusive = 0; | |
66cf9a7e | 2313 | regulator_unlock(rdev); |
5ffbd136 | 2314 | |
0630b614 | 2315 | kfree_const(regulator->supply_name); |
1768514e | 2316 | kfree(regulator); |
e1794aa4 SK |
2317 | } |
2318 | ||
2319 | /* regulator_list_mutex lock held by regulator_put() */ | |
2320 | static void _regulator_put(struct regulator *regulator) | |
2321 | { | |
2322 | struct regulator_dev *rdev; | |
2323 | ||
2324 | if (IS_ERR_OR_NULL(regulator)) | |
2325 | return; | |
2326 | ||
2327 | lockdep_assert_held_once(®ulator_list_mutex); | |
2328 | ||
2329 | /* Docs say you must disable before calling regulator_put() */ | |
2330 | WARN_ON(regulator->enable_count); | |
2331 | ||
2332 | rdev = regulator->rdev; | |
2333 | ||
2334 | destroy_regulator(regulator); | |
1768514e | 2335 | |
414c70cb | 2336 | module_put(rdev->owner); |
4affd79a | 2337 | put_device(&rdev->dev); |
23ff2f0f CK |
2338 | } |
2339 | ||
2340 | /** | |
2341 | * regulator_put - "free" the regulator source | |
2342 | * @regulator: regulator source | |
2343 | * | |
2344 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2345 | * regulator source are balanced by regulator_disable calls prior to calling | |
2346 | * this function. | |
2347 | */ | |
2348 | void regulator_put(struct regulator *regulator) | |
2349 | { | |
2350 | mutex_lock(®ulator_list_mutex); | |
2351 | _regulator_put(regulator); | |
414c70cb LG |
2352 | mutex_unlock(®ulator_list_mutex); |
2353 | } | |
2354 | EXPORT_SYMBOL_GPL(regulator_put); | |
2355 | ||
a06ccd9c CK |
2356 | /** |
2357 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2358 | * | |
2359 | * @dev: device that will be given as the regulator "consumer" | |
2360 | * @id: Supply name or regulator ID | |
2361 | * @alias_dev: device that should be used to lookup the supply | |
2362 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2363 | * supply | |
2364 | * | |
2365 | * All lookups for id on dev will instead be conducted for alias_id on | |
2366 | * alias_dev. | |
2367 | */ | |
2368 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2369 | struct device *alias_dev, | |
2370 | const char *alias_id) | |
2371 | { | |
2372 | struct regulator_supply_alias *map; | |
2373 | ||
2374 | map = regulator_find_supply_alias(dev, id); | |
2375 | if (map) | |
2376 | return -EEXIST; | |
2377 | ||
2378 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2379 | if (!map) | |
2380 | return -ENOMEM; | |
2381 | ||
2382 | map->src_dev = dev; | |
2383 | map->src_supply = id; | |
2384 | map->alias_dev = alias_dev; | |
2385 | map->alias_supply = alias_id; | |
2386 | ||
2387 | list_add(&map->list, ®ulator_supply_alias_list); | |
2388 | ||
2389 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2390 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2391 | ||
2392 | return 0; | |
2393 | } | |
2394 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2395 | ||
2396 | /** | |
2397 | * regulator_unregister_supply_alias - Remove device alias | |
2398 | * | |
2399 | * @dev: device that will be given as the regulator "consumer" | |
2400 | * @id: Supply name or regulator ID | |
2401 | * | |
2402 | * Remove a lookup alias if one exists for id on dev. | |
2403 | */ | |
2404 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2405 | { | |
2406 | struct regulator_supply_alias *map; | |
2407 | ||
2408 | map = regulator_find_supply_alias(dev, id); | |
2409 | if (map) { | |
2410 | list_del(&map->list); | |
2411 | kfree(map); | |
2412 | } | |
2413 | } | |
2414 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2415 | ||
2416 | /** | |
2417 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2418 | * | |
2419 | * @dev: device that will be given as the regulator "consumer" | |
2420 | * @id: List of supply names or regulator IDs | |
2421 | * @alias_dev: device that should be used to lookup the supply | |
2422 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2423 | * lookup the supply | |
2424 | * @num_id: Number of aliases to register | |
2425 | * | |
2426 | * @return 0 on success, an errno on failure. | |
2427 | * | |
2428 | * This helper function allows drivers to register several supply | |
2429 | * aliases in one operation. If any of the aliases cannot be | |
2430 | * registered any aliases that were registered will be removed | |
2431 | * before returning to the caller. | |
2432 | */ | |
9f8c0fe9 LJ |
2433 | int regulator_bulk_register_supply_alias(struct device *dev, |
2434 | const char *const *id, | |
a06ccd9c | 2435 | struct device *alias_dev, |
9f8c0fe9 | 2436 | const char *const *alias_id, |
a06ccd9c CK |
2437 | int num_id) |
2438 | { | |
2439 | int i; | |
2440 | int ret; | |
2441 | ||
2442 | for (i = 0; i < num_id; ++i) { | |
2443 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2444 | alias_id[i]); | |
2445 | if (ret < 0) | |
2446 | goto err; | |
2447 | } | |
2448 | ||
2449 | return 0; | |
2450 | ||
2451 | err: | |
2452 | dev_err(dev, | |
2453 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2454 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2455 | ||
2456 | while (--i >= 0) | |
2457 | regulator_unregister_supply_alias(dev, id[i]); | |
2458 | ||
2459 | return ret; | |
2460 | } | |
2461 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2462 | ||
2463 | /** | |
2464 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2465 | * | |
2466 | * @dev: device that will be given as the regulator "consumer" | |
2467 | * @id: List of supply names or regulator IDs | |
2468 | * @num_id: Number of aliases to unregister | |
2469 | * | |
2470 | * This helper function allows drivers to unregister several supply | |
2471 | * aliases in one operation. | |
2472 | */ | |
2473 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2474 | const char *const *id, |
a06ccd9c CK |
2475 | int num_id) |
2476 | { | |
2477 | int i; | |
2478 | ||
2479 | for (i = 0; i < num_id; ++i) | |
2480 | regulator_unregister_supply_alias(dev, id[i]); | |
2481 | } | |
2482 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2483 | ||
2484 | ||
f19b00da KM |
2485 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2486 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2487 | const struct regulator_config *config) | |
2488 | { | |
467bf301 | 2489 | struct regulator_enable_gpio *pin, *new_pin; |
778b28b4 | 2490 | struct gpio_desc *gpiod; |
f19b00da | 2491 | |
541d052d | 2492 | gpiod = config->ena_gpiod; |
467bf301 MM |
2493 | new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL); |
2494 | ||
2495 | mutex_lock(®ulator_list_mutex); | |
778b28b4 | 2496 | |
f19b00da | 2497 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2498 | if (pin->gpiod == gpiod) { |
541d052d | 2499 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2500 | goto update_ena_gpio_to_rdev; |
2501 | } | |
2502 | } | |
2503 | ||
467bf301 MM |
2504 | if (new_pin == NULL) { |
2505 | mutex_unlock(®ulator_list_mutex); | |
f19b00da | 2506 | return -ENOMEM; |
467bf301 MM |
2507 | } |
2508 | ||
2509 | pin = new_pin; | |
2510 | new_pin = NULL; | |
f19b00da | 2511 | |
778b28b4 | 2512 | pin->gpiod = gpiod; |
f19b00da KM |
2513 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2514 | ||
2515 | update_ena_gpio_to_rdev: | |
2516 | pin->request_count++; | |
2517 | rdev->ena_pin = pin; | |
467bf301 MM |
2518 | |
2519 | mutex_unlock(®ulator_list_mutex); | |
2520 | kfree(new_pin); | |
2521 | ||
f19b00da KM |
2522 | return 0; |
2523 | } | |
2524 | ||
2525 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2526 | { | |
2527 | struct regulator_enable_gpio *pin, *n; | |
2528 | ||
2529 | if (!rdev->ena_pin) | |
2530 | return; | |
2531 | ||
2532 | /* Free the GPIO only in case of no use */ | |
2533 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
2dbf0855 MM |
2534 | if (pin != rdev->ena_pin) |
2535 | continue; | |
2536 | ||
2537 | if (--pin->request_count) | |
2538 | break; | |
2539 | ||
2540 | gpiod_put(pin->gpiod); | |
2541 | list_del(&pin->list); | |
2542 | kfree(pin); | |
2543 | break; | |
f19b00da | 2544 | } |
2dbf0855 MM |
2545 | |
2546 | rdev->ena_pin = NULL; | |
f19b00da KM |
2547 | } |
2548 | ||
967cfb18 | 2549 | /** |
31d6eebf RD |
2550 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2551 | * @rdev: regulator_dev structure | |
2552 | * @enable: enable GPIO at initial use? | |
2553 | * | |
967cfb18 KM |
2554 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2555 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2556 | */ | |
2557 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2558 | { | |
2559 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2560 | ||
2561 | if (!pin) | |
2562 | return -EINVAL; | |
2563 | ||
2564 | if (enable) { | |
2565 | /* Enable GPIO at initial use */ | |
2566 | if (pin->enable_count == 0) | |
01dc79cd | 2567 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2568 | |
2569 | pin->enable_count++; | |
2570 | } else { | |
2571 | if (pin->enable_count > 1) { | |
2572 | pin->enable_count--; | |
2573 | return 0; | |
2574 | } | |
2575 | ||
2576 | /* Disable GPIO if not used */ | |
2577 | if (pin->enable_count <= 1) { | |
01dc79cd | 2578 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2579 | pin->enable_count = 0; |
2580 | } | |
2581 | } | |
2582 | ||
2583 | return 0; | |
2584 | } | |
2585 | ||
79fd1141 | 2586 | /** |
a38dce4c | 2587 | * _regulator_delay_helper - a delay helper function |
79fd1141 GX |
2588 | * @delay: time to delay in microseconds |
2589 | * | |
2590 | * Delay for the requested amount of time as per the guidelines in: | |
2591 | * | |
458f69ef | 2592 | * Documentation/timers/timers-howto.rst |
79fd1141 | 2593 | * |
a38dce4c | 2594 | * The assumption here is that these regulator operations will never used in |
79fd1141 GX |
2595 | * atomic context and therefore sleeping functions can be used. |
2596 | */ | |
a38dce4c | 2597 | static void _regulator_delay_helper(unsigned int delay) |
79fd1141 GX |
2598 | { |
2599 | unsigned int ms = delay / 1000; | |
2600 | unsigned int us = delay % 1000; | |
2601 | ||
2602 | if (ms > 0) { | |
2603 | /* | |
2604 | * For small enough values, handle super-millisecond | |
2605 | * delays in the usleep_range() call below. | |
2606 | */ | |
2607 | if (ms < 20) | |
2608 | us += ms * 1000; | |
2609 | else | |
2610 | msleep(ms); | |
2611 | } | |
2612 | ||
2613 | /* | |
2614 | * Give the scheduler some room to coalesce with any other | |
2615 | * wakeup sources. For delays shorter than 10 us, don't even | |
2616 | * bother setting up high-resolution timers and just busy- | |
2617 | * loop. | |
2618 | */ | |
2619 | if (us >= 10) | |
2620 | usleep_range(us, us + 100); | |
2621 | else | |
2622 | udelay(us); | |
2623 | } | |
2624 | ||
f7d7ad42 SS |
2625 | /** |
2626 | * _regulator_check_status_enabled | |
2627 | * | |
2628 | * A helper function to check if the regulator status can be interpreted | |
2629 | * as 'regulator is enabled'. | |
2630 | * @rdev: the regulator device to check | |
2631 | * | |
2632 | * Return: | |
2633 | * * 1 - if status shows regulator is in enabled state | |
2634 | * * 0 - if not enabled state | |
2635 | * * Error Value - as received from ops->get_status() | |
2636 | */ | |
2637 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2638 | { | |
2639 | int ret = rdev->desc->ops->get_status(rdev); | |
2640 | ||
2641 | if (ret < 0) { | |
2642 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2643 | return ret; | |
2644 | } | |
2645 | ||
2646 | switch (ret) { | |
2647 | case REGULATOR_STATUS_OFF: | |
2648 | case REGULATOR_STATUS_ERROR: | |
2649 | case REGULATOR_STATUS_UNDEFINED: | |
2650 | return 0; | |
2651 | default: | |
2652 | return 1; | |
2653 | } | |
2654 | } | |
2655 | ||
5c5659d0 MB |
2656 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2657 | { | |
2658 | int ret, delay; | |
2659 | ||
2660 | /* Query before enabling in case configuration dependent. */ | |
2661 | ret = _regulator_get_enable_time(rdev); | |
2662 | if (ret >= 0) { | |
2663 | delay = ret; | |
2664 | } else { | |
61aab5ad | 2665 | rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret)); |
5c5659d0 MB |
2666 | delay = 0; |
2667 | } | |
2668 | ||
2669 | trace_regulator_enable(rdev_get_name(rdev)); | |
2670 | ||
a8ce7bd8 | 2671 | if (rdev->desc->off_on_delay && rdev->last_off) { |
871f5650 GX |
2672 | /* if needed, keep a distance of off_on_delay from last time |
2673 | * this regulator was disabled. | |
2674 | */ | |
a8ce7bd8 VW |
2675 | ktime_t end = ktime_add_us(rdev->last_off, rdev->desc->off_on_delay); |
2676 | s64 remaining = ktime_us_delta(end, ktime_get()); | |
2677 | ||
2678 | if (remaining > 0) | |
a38dce4c | 2679 | _regulator_delay_helper(remaining); |
871f5650 GX |
2680 | } |
2681 | ||
967cfb18 | 2682 | if (rdev->ena_pin) { |
29d62ec5 DA |
2683 | if (!rdev->ena_gpio_state) { |
2684 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2685 | if (ret < 0) | |
2686 | return ret; | |
2687 | rdev->ena_gpio_state = 1; | |
2688 | } | |
65f73508 | 2689 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2690 | ret = rdev->desc->ops->enable(rdev); |
2691 | if (ret < 0) | |
2692 | return ret; | |
2693 | } else { | |
2694 | return -EINVAL; | |
2695 | } | |
2696 | ||
2697 | /* Allow the regulator to ramp; it would be useful to extend | |
2698 | * this for bulk operations so that the regulators can ramp | |
69b8821e SK |
2699 | * together. |
2700 | */ | |
5c5659d0 MB |
2701 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
2702 | ||
f7d7ad42 SS |
2703 | /* If poll_enabled_time is set, poll upto the delay calculated |
2704 | * above, delaying poll_enabled_time uS to check if the regulator | |
2705 | * actually got enabled. | |
a38dce4c BN |
2706 | * If the regulator isn't enabled after our delay helper has expired, |
2707 | * return -ETIMEDOUT. | |
f7d7ad42 SS |
2708 | */ |
2709 | if (rdev->desc->poll_enabled_time) { | |
8d8e1659 | 2710 | int time_remaining = delay; |
f7d7ad42 SS |
2711 | |
2712 | while (time_remaining > 0) { | |
a38dce4c | 2713 | _regulator_delay_helper(rdev->desc->poll_enabled_time); |
f7d7ad42 SS |
2714 | |
2715 | if (rdev->desc->ops->get_status) { | |
2716 | ret = _regulator_check_status_enabled(rdev); | |
2717 | if (ret < 0) | |
2718 | return ret; | |
2719 | else if (ret) | |
2720 | break; | |
2721 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2722 | break; | |
2723 | ||
2724 | time_remaining -= rdev->desc->poll_enabled_time; | |
2725 | } | |
2726 | ||
2727 | if (time_remaining <= 0) { | |
2728 | rdev_err(rdev, "Enabled check timed out\n"); | |
2729 | return -ETIMEDOUT; | |
2730 | } | |
2731 | } else { | |
a38dce4c | 2732 | _regulator_delay_helper(delay); |
f7d7ad42 | 2733 | } |
5c5659d0 MB |
2734 | |
2735 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2736 | ||
2737 | return 0; | |
2738 | } | |
2739 | ||
5451781d DA |
2740 | /** |
2741 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2742 | * @regulator: regulator source | |
2743 | * | |
2744 | * Some things on a regulator consumer (like the contribution towards total | |
2745 | * load on the regulator) only have an effect when the consumer wants the | |
2746 | * regulator enabled. Explained in example with two consumers of the same | |
2747 | * regulator: | |
2748 | * consumer A: set_load(100); => total load = 0 | |
2749 | * consumer A: regulator_enable(); => total load = 100 | |
2750 | * consumer B: set_load(1000); => total load = 100 | |
2751 | * consumer B: regulator_enable(); => total load = 1100 | |
2752 | * consumer A: regulator_disable(); => total_load = 1000 | |
2753 | * | |
2754 | * This function (together with _regulator_handle_consumer_disable) is | |
2755 | * responsible for keeping track of the refcount for a given regulator consumer | |
2756 | * and applying / unapplying these things. | |
2757 | * | |
2758 | * Returns 0 upon no error; -error upon error. | |
2759 | */ | |
2760 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2761 | { | |
c32f1ebf | 2762 | int ret; |
5451781d DA |
2763 | struct regulator_dev *rdev = regulator->rdev; |
2764 | ||
2765 | lockdep_assert_held_once(&rdev->mutex.base); | |
2766 | ||
2767 | regulator->enable_count++; | |
c32f1ebf AH |
2768 | if (regulator->uA_load && regulator->enable_count == 1) { |
2769 | ret = drms_uA_update(rdev); | |
2770 | if (ret) | |
2771 | regulator->enable_count--; | |
2772 | return ret; | |
2773 | } | |
5451781d DA |
2774 | |
2775 | return 0; | |
2776 | } | |
2777 | ||
2778 | /** | |
2779 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2780 | * @regulator: regulator source | |
2781 | * | |
2782 | * The opposite of _regulator_handle_consumer_enable(). | |
2783 | * | |
2784 | * Returns 0 upon no error; -error upon error. | |
2785 | */ | |
2786 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2787 | { | |
2788 | struct regulator_dev *rdev = regulator->rdev; | |
2789 | ||
2790 | lockdep_assert_held_once(&rdev->mutex.base); | |
2791 | ||
2792 | if (!regulator->enable_count) { | |
2793 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2794 | return -EINVAL; | |
2795 | } | |
2796 | ||
2797 | regulator->enable_count--; | |
2798 | if (regulator->uA_load && regulator->enable_count == 0) | |
2799 | return drms_uA_update(rdev); | |
2800 | ||
2801 | return 0; | |
2802 | } | |
2803 | ||
414c70cb | 2804 | /* locks held by regulator_enable() */ |
5451781d | 2805 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2806 | { |
5451781d | 2807 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2808 | int ret; |
414c70cb | 2809 | |
f8702f9e DO |
2810 | lockdep_assert_held_once(&rdev->mutex.base); |
2811 | ||
1fc12b05 | 2812 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2813 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2814 | if (ret < 0) |
2815 | return ret; | |
2816 | } | |
2817 | ||
2818 | /* balance only if there are regulators coupled */ | |
2819 | if (rdev->coupling_desc.n_coupled > 1) { | |
2820 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2821 | if (ret < 0) | |
2822 | goto err_disable_supply; | |
2823 | } | |
70cfef26 | 2824 | |
5451781d DA |
2825 | ret = _regulator_handle_consumer_enable(regulator); |
2826 | if (ret < 0) | |
2827 | goto err_disable_supply; | |
414c70cb | 2828 | |
9a2372fa | 2829 | if (rdev->use_count == 0) { |
72241e31 SF |
2830 | /* |
2831 | * The regulator may already be enabled if it's not switchable | |
2832 | * or was left on | |
2833 | */ | |
9a2372fa MB |
2834 | ret = _regulator_is_enabled(rdev); |
2835 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2836 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2837 | REGULATOR_CHANGE_STATUS)) { |
2838 | ret = -EPERM; | |
5451781d | 2839 | goto err_consumer_disable; |
f8702f9e | 2840 | } |
9a2372fa | 2841 | |
5c5659d0 | 2842 | ret = _regulator_do_enable(rdev); |
31aae2be | 2843 | if (ret < 0) |
5451781d | 2844 | goto err_consumer_disable; |
31aae2be | 2845 | |
264b88c9 HG |
2846 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2847 | NULL); | |
a7433cff | 2848 | } else if (ret < 0) { |
61aab5ad | 2849 | rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret)); |
5451781d | 2850 | goto err_consumer_disable; |
414c70cb | 2851 | } |
a7433cff | 2852 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2853 | } |
2854 | ||
9a2372fa MB |
2855 | rdev->use_count++; |
2856 | ||
2857 | return 0; | |
f8702f9e | 2858 | |
5451781d DA |
2859 | err_consumer_disable: |
2860 | _regulator_handle_consumer_disable(regulator); | |
2861 | ||
f8702f9e | 2862 | err_disable_supply: |
1fc12b05 | 2863 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2864 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2865 | |
2866 | return ret; | |
414c70cb LG |
2867 | } |
2868 | ||
2869 | /** | |
2870 | * regulator_enable - enable regulator output | |
2871 | * @regulator: regulator source | |
2872 | * | |
cf7bbcdf MB |
2873 | * Request that the regulator be enabled with the regulator output at |
2874 | * the predefined voltage or current value. Calls to regulator_enable() | |
2875 | * must be balanced with calls to regulator_disable(). | |
2876 | * | |
414c70cb | 2877 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2878 | * hardwired in the regulator. |
414c70cb LG |
2879 | */ |
2880 | int regulator_enable(struct regulator *regulator) | |
2881 | { | |
412aec61 | 2882 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2883 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2884 | int ret; |
6492bc1b | 2885 | |
f8702f9e | 2886 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2887 | ret = _regulator_enable(regulator); |
f8702f9e | 2888 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2889 | |
414c70cb LG |
2890 | return ret; |
2891 | } | |
2892 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2893 | ||
5c5659d0 MB |
2894 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2895 | { | |
2896 | int ret; | |
2897 | ||
2898 | trace_regulator_disable(rdev_get_name(rdev)); | |
2899 | ||
967cfb18 | 2900 | if (rdev->ena_pin) { |
29d62ec5 DA |
2901 | if (rdev->ena_gpio_state) { |
2902 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2903 | if (ret < 0) | |
2904 | return ret; | |
2905 | rdev->ena_gpio_state = 0; | |
2906 | } | |
5c5659d0 MB |
2907 | |
2908 | } else if (rdev->desc->ops->disable) { | |
2909 | ret = rdev->desc->ops->disable(rdev); | |
2910 | if (ret != 0) | |
2911 | return ret; | |
2912 | } | |
2913 | ||
871f5650 | 2914 | if (rdev->desc->off_on_delay) |
a8ce7bd8 | 2915 | rdev->last_off = ktime_get(); |
871f5650 | 2916 | |
5c5659d0 MB |
2917 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2918 | ||
5c5659d0 MB |
2919 | return 0; |
2920 | } | |
2921 | ||
414c70cb | 2922 | /* locks held by regulator_disable() */ |
5451781d | 2923 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2924 | { |
5451781d | 2925 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2926 | int ret = 0; |
2927 | ||
f8702f9e | 2928 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2929 | |
cd94b505 | 2930 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2931 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2932 | return -EIO; |
2933 | ||
414c70cb | 2934 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2935 | if (rdev->use_count == 1 && |
2936 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2937 | |
2938 | /* we are last user */ | |
8a34e979 | 2939 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2940 | ret = _notifier_call_chain(rdev, |
2941 | REGULATOR_EVENT_PRE_DISABLE, | |
2942 | NULL); | |
2943 | if (ret & NOTIFY_STOP_MASK) | |
2944 | return -EINVAL; | |
2945 | ||
5c5659d0 | 2946 | ret = _regulator_do_disable(rdev); |
414c70cb | 2947 | if (ret < 0) { |
61aab5ad | 2948 | rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2949 | _notifier_call_chain(rdev, |
2950 | REGULATOR_EVENT_ABORT_DISABLE, | |
2951 | NULL); | |
414c70cb LG |
2952 | return ret; |
2953 | } | |
66fda75f MP |
2954 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2955 | NULL); | |
414c70cb LG |
2956 | } |
2957 | ||
414c70cb LG |
2958 | rdev->use_count = 0; |
2959 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2960 | rdev->use_count--; |
2961 | } | |
3801b86a | 2962 | |
5451781d DA |
2963 | if (ret == 0) |
2964 | ret = _regulator_handle_consumer_disable(regulator); | |
2965 | ||
f8702f9e DO |
2966 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2967 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2968 | ||
1fc12b05 | 2969 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2970 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2971 | |
414c70cb LG |
2972 | return ret; |
2973 | } | |
2974 | ||
2975 | /** | |
2976 | * regulator_disable - disable regulator output | |
2977 | * @regulator: regulator source | |
2978 | * | |
cf7bbcdf MB |
2979 | * Disable the regulator output voltage or current. Calls to |
2980 | * regulator_enable() must be balanced with calls to | |
2981 | * regulator_disable(). | |
69279fb9 | 2982 | * |
414c70cb | 2983 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2984 | * devices have it enabled, the regulator device supports disabling and |
2985 | * machine constraints permit this operation. | |
414c70cb LG |
2986 | */ |
2987 | int regulator_disable(struct regulator *regulator) | |
2988 | { | |
412aec61 | 2989 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2990 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2991 | int ret; |
6492bc1b | 2992 | |
f8702f9e | 2993 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2994 | ret = _regulator_disable(regulator); |
f8702f9e | 2995 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2996 | |
414c70cb LG |
2997 | return ret; |
2998 | } | |
2999 | EXPORT_SYMBOL_GPL(regulator_disable); | |
3000 | ||
3001 | /* locks held by regulator_force_disable() */ | |
3801b86a | 3002 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
3003 | { |
3004 | int ret = 0; | |
3005 | ||
f8702f9e | 3006 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 3007 | |
a1c8a551 RF |
3008 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
3009 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
3010 | if (ret & NOTIFY_STOP_MASK) | |
3011 | return -EINVAL; | |
3012 | ||
66fda75f MP |
3013 | ret = _regulator_do_disable(rdev); |
3014 | if (ret < 0) { | |
61aab5ad | 3015 | rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
3016 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
3017 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 3018 | return ret; |
414c70cb LG |
3019 | } |
3020 | ||
66fda75f MP |
3021 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
3022 | REGULATOR_EVENT_DISABLE, NULL); | |
3023 | ||
3024 | return 0; | |
414c70cb LG |
3025 | } |
3026 | ||
3027 | /** | |
3028 | * regulator_force_disable - force disable regulator output | |
3029 | * @regulator: regulator source | |
3030 | * | |
3031 | * Forcibly disable the regulator output voltage or current. | |
3032 | * NOTE: this *will* disable the regulator output even if other consumer | |
3033 | * devices have it enabled. This should be used for situations when device | |
3034 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
3035 | */ | |
3036 | int regulator_force_disable(struct regulator *regulator) | |
3037 | { | |
82d15839 | 3038 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 3039 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
3040 | int ret; |
3041 | ||
f8702f9e | 3042 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 3043 | |
3801b86a | 3044 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 3045 | |
9243a195 MP |
3046 | if (rdev->coupling_desc.n_coupled > 1) |
3047 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
3048 | |
3049 | if (regulator->uA_load) { | |
3050 | regulator->uA_load = 0; | |
3051 | ret = drms_uA_update(rdev); | |
3052 | } | |
3053 | ||
1fc12b05 DA |
3054 | if (rdev->use_count != 0 && rdev->supply) |
3055 | _regulator_disable(rdev->supply); | |
8cbf811d | 3056 | |
1fc12b05 | 3057 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 3058 | |
414c70cb LG |
3059 | return ret; |
3060 | } | |
3061 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
3062 | ||
da07ecd9 MB |
3063 | static void regulator_disable_work(struct work_struct *work) |
3064 | { | |
3065 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
3066 | disable_work.work); | |
f8702f9e | 3067 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 3068 | int count, i, ret; |
5451781d DA |
3069 | struct regulator *regulator; |
3070 | int total_count = 0; | |
da07ecd9 | 3071 | |
f8702f9e | 3072 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 3073 | |
c9ccaa0c TR |
3074 | /* |
3075 | * Workqueue functions queue the new work instance while the previous | |
3076 | * work instance is being processed. Cancel the queued work instance | |
3077 | * as the work instance under processing does the job of the queued | |
3078 | * work instance. | |
3079 | */ | |
3080 | cancel_delayed_work(&rdev->disable_work); | |
3081 | ||
5451781d DA |
3082 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
3083 | count = regulator->deferred_disables; | |
3084 | ||
3085 | if (!count) | |
3086 | continue; | |
3087 | ||
3088 | total_count += count; | |
3089 | regulator->deferred_disables = 0; | |
3090 | ||
3091 | for (i = 0; i < count; i++) { | |
3092 | ret = _regulator_disable(regulator); | |
3093 | if (ret != 0) | |
61aab5ad MM |
3094 | rdev_err(rdev, "Deferred disable failed: %pe\n", |
3095 | ERR_PTR(ret)); | |
5451781d | 3096 | } |
da07ecd9 | 3097 | } |
5451781d | 3098 | WARN_ON(!total_count); |
da07ecd9 | 3099 | |
f8702f9e DO |
3100 | if (rdev->coupling_desc.n_coupled > 1) |
3101 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
3102 | ||
3103 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
3104 | } |
3105 | ||
3106 | /** | |
3107 | * regulator_disable_deferred - disable regulator output with delay | |
3108 | * @regulator: regulator source | |
48f1b4ef | 3109 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
3110 | * |
3111 | * Execute regulator_disable() on the regulator after a delay. This | |
3112 | * is intended for use with devices that require some time to quiesce. | |
3113 | * | |
3114 | * NOTE: this will only disable the regulator output if no other consumer | |
3115 | * devices have it enabled, the regulator device supports disabling and | |
3116 | * machine constraints permit this operation. | |
3117 | */ | |
3118 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
3119 | { | |
3120 | struct regulator_dev *rdev = regulator->rdev; | |
3121 | ||
2b5a24a0 MB |
3122 | if (!ms) |
3123 | return regulator_disable(regulator); | |
3124 | ||
66cf9a7e | 3125 | regulator_lock(rdev); |
5451781d | 3126 | regulator->deferred_disables++; |
c9ccaa0c TR |
3127 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
3128 | msecs_to_jiffies(ms)); | |
66cf9a7e | 3129 | regulator_unlock(rdev); |
da07ecd9 | 3130 | |
70dc6daf | 3131 | return 0; |
da07ecd9 MB |
3132 | } |
3133 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
3134 | ||
414c70cb LG |
3135 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
3136 | { | |
65f73508 | 3137 | /* A GPIO control always takes precedence */ |
7b74d149 | 3138 | if (rdev->ena_pin) |
65f73508 MB |
3139 | return rdev->ena_gpio_state; |
3140 | ||
9a7f6a4c | 3141 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 3142 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 3143 | return 1; |
414c70cb | 3144 | |
9332546f | 3145 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
3146 | } |
3147 | ||
3d67fe95 MP |
3148 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
3149 | unsigned selector, int lock) | |
3a40cfc3 | 3150 | { |
3a40cfc3 SH |
3151 | const struct regulator_ops *ops = rdev->desc->ops; |
3152 | int ret; | |
3153 | ||
3154 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
3155 | return rdev->desc->fixed_uV; | |
3156 | ||
3157 | if (ops->list_voltage) { | |
3158 | if (selector >= rdev->desc->n_voltages) | |
3159 | return -EINVAL; | |
55cca739 CB |
3160 | if (selector < rdev->desc->linear_min_sel) |
3161 | return 0; | |
3a40cfc3 | 3162 | if (lock) |
66cf9a7e | 3163 | regulator_lock(rdev); |
3a40cfc3 SH |
3164 | ret = ops->list_voltage(rdev, selector); |
3165 | if (lock) | |
66cf9a7e | 3166 | regulator_unlock(rdev); |
fd086045 | 3167 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
3168 | ret = _regulator_list_voltage(rdev->supply->rdev, |
3169 | selector, lock); | |
3a40cfc3 SH |
3170 | } else { |
3171 | return -EINVAL; | |
3172 | } | |
3173 | ||
3174 | if (ret > 0) { | |
3175 | if (ret < rdev->constraints->min_uV) | |
3176 | ret = 0; | |
3177 | else if (ret > rdev->constraints->max_uV) | |
3178 | ret = 0; | |
3179 | } | |
3180 | ||
3181 | return ret; | |
3182 | } | |
3183 | ||
414c70cb LG |
3184 | /** |
3185 | * regulator_is_enabled - is the regulator output enabled | |
3186 | * @regulator: regulator source | |
3187 | * | |
412aec61 DB |
3188 | * Returns positive if the regulator driver backing the source/client |
3189 | * has requested that the device be enabled, zero if it hasn't, else a | |
3190 | * negative errno code. | |
3191 | * | |
3192 | * Note that the device backing this regulator handle can have multiple | |
3193 | * users, so it might be enabled even if regulator_enable() was never | |
3194 | * called for this particular source. | |
414c70cb LG |
3195 | */ |
3196 | int regulator_is_enabled(struct regulator *regulator) | |
3197 | { | |
9332546f MB |
3198 | int ret; |
3199 | ||
6492bc1b MB |
3200 | if (regulator->always_on) |
3201 | return 1; | |
3202 | ||
f8702f9e | 3203 | regulator_lock(regulator->rdev); |
9332546f | 3204 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 3205 | regulator_unlock(regulator->rdev); |
9332546f MB |
3206 | |
3207 | return ret; | |
414c70cb LG |
3208 | } |
3209 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
3210 | ||
4367cfdc DB |
3211 | /** |
3212 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
3213 | * @regulator: regulator source | |
3214 | * | |
3215 | * Returns number of selectors, or negative errno. Selectors are | |
3216 | * numbered starting at zero, and typically correspond to bitfields | |
3217 | * in hardware registers. | |
3218 | */ | |
3219 | int regulator_count_voltages(struct regulator *regulator) | |
3220 | { | |
3221 | struct regulator_dev *rdev = regulator->rdev; | |
3222 | ||
26988efe JMC |
3223 | if (rdev->desc->n_voltages) |
3224 | return rdev->desc->n_voltages; | |
3225 | ||
fd086045 | 3226 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
3227 | return -EINVAL; |
3228 | ||
3229 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
3230 | } |
3231 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
3232 | ||
3233 | /** | |
3234 | * regulator_list_voltage - enumerate supported voltages | |
3235 | * @regulator: regulator source | |
3236 | * @selector: identify voltage to list | |
3237 | * Context: can sleep | |
3238 | * | |
3239 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 3240 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
3241 | * negative errno. |
3242 | */ | |
3243 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
3244 | { | |
3d67fe95 | 3245 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
3246 | } |
3247 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
3248 | ||
04eca28c TT |
3249 | /** |
3250 | * regulator_get_regmap - get the regulator's register map | |
3251 | * @regulator: regulator source | |
3252 | * | |
3253 | * Returns the register map for the given regulator, or an ERR_PTR value | |
3254 | * if the regulator doesn't use regmap. | |
3255 | */ | |
3256 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
3257 | { | |
3258 | struct regmap *map = regulator->rdev->regmap; | |
3259 | ||
3260 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
3261 | } | |
3262 | ||
3263 | /** | |
3264 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3265 | * @regulator: regulator source | |
3266 | * @vsel_reg: voltage selector register, output parameter | |
3267 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3268 | * | |
3269 | * Returns the hardware register offset and bitmask used for setting the | |
3270 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3271 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3272 | * for example. | |
3273 | * | |
3274 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3275 | * and 0 is returned, otherwise a negative errno is returned. | |
3276 | */ | |
3277 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3278 | unsigned *vsel_reg, | |
3279 | unsigned *vsel_mask) | |
3280 | { | |
39f5460d GX |
3281 | struct regulator_dev *rdev = regulator->rdev; |
3282 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3283 | |
3284 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3285 | return -EOPNOTSUPP; | |
3286 | ||
0d5c8633 CIK |
3287 | *vsel_reg = rdev->desc->vsel_reg; |
3288 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c | 3289 | |
be35cc46 | 3290 | return 0; |
04eca28c TT |
3291 | } |
3292 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3293 | ||
3294 | /** | |
3295 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3296 | * @regulator: regulator source | |
3297 | * @selector: identify voltage to list | |
3298 | * | |
3299 | * Converts the selector to a hardware-specific voltage selector that can be | |
3300 | * directly written to the regulator registers. The address of the voltage | |
3301 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3302 | * | |
3303 | * On error a negative errno is returned. | |
3304 | */ | |
3305 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3306 | unsigned selector) | |
3307 | { | |
39f5460d GX |
3308 | struct regulator_dev *rdev = regulator->rdev; |
3309 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3310 | |
3311 | if (selector >= rdev->desc->n_voltages) | |
3312 | return -EINVAL; | |
55cca739 CB |
3313 | if (selector < rdev->desc->linear_min_sel) |
3314 | return 0; | |
04eca28c TT |
3315 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) |
3316 | return -EOPNOTSUPP; | |
3317 | ||
3318 | return selector; | |
3319 | } | |
3320 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3321 | ||
2a668a8b PW |
3322 | /** |
3323 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3324 | * @regulator: regulator source | |
3325 | * | |
3326 | * Returns the voltage step size between VSEL values for linear | |
3327 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3328 | */ | |
3329 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3330 | { | |
3331 | struct regulator_dev *rdev = regulator->rdev; | |
3332 | ||
3333 | return rdev->desc->uV_step; | |
3334 | } | |
3335 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3336 | ||
a7a1ad90 MB |
3337 | /** |
3338 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3339 | * | |
3340 | * @regulator: Regulator to check. | |
3341 | * @min_uV: Minimum required voltage in uV. | |
3342 | * @max_uV: Maximum required voltage in uV. | |
3343 | * | |
49820944 | 3344 | * Returns a boolean. |
a7a1ad90 MB |
3345 | */ |
3346 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3347 | int min_uV, int max_uV) | |
3348 | { | |
c5f3939b | 3349 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3350 | int i, voltages, ret; |
3351 | ||
c5f3939b | 3352 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3353 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3354 | ret = regulator_get_voltage(regulator); |
3355 | if (ret >= 0) | |
0d25d09d | 3356 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3357 | else |
3358 | return ret; | |
3359 | } | |
3360 | ||
bd7a2b60 PM |
3361 | /* Any voltage within constrains range is fine? */ |
3362 | if (rdev->desc->continuous_voltage_range) | |
3363 | return min_uV >= rdev->constraints->min_uV && | |
3364 | max_uV <= rdev->constraints->max_uV; | |
3365 | ||
a7a1ad90 MB |
3366 | ret = regulator_count_voltages(regulator); |
3367 | if (ret < 0) | |
49820944 | 3368 | return 0; |
a7a1ad90 MB |
3369 | voltages = ret; |
3370 | ||
3371 | for (i = 0; i < voltages; i++) { | |
3372 | ret = regulator_list_voltage(regulator, i); | |
3373 | ||
3374 | if (ret >= min_uV && ret <= max_uV) | |
3375 | return 1; | |
3376 | } | |
3377 | ||
3378 | return 0; | |
3379 | } | |
a398eaa2 | 3380 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3381 | |
a204f41e SH |
3382 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3383 | int max_uV) | |
3384 | { | |
3385 | const struct regulator_desc *desc = rdev->desc; | |
3386 | ||
3387 | if (desc->ops->map_voltage) | |
3388 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3389 | ||
3390 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3391 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3392 | ||
3393 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3394 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3395 | ||
18e4b55f MV |
3396 | if (desc->ops->list_voltage == |
3397 | regulator_list_voltage_pickable_linear_range) | |
3398 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3399 | min_uV, max_uV); | |
3400 | ||
a204f41e SH |
3401 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3402 | } | |
3403 | ||
7179569a HS |
3404 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3405 | int min_uV, int max_uV, | |
3406 | unsigned *selector) | |
3407 | { | |
3408 | struct pre_voltage_change_data data; | |
3409 | int ret; | |
3410 | ||
d22b85a1 | 3411 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3412 | data.min_uV = min_uV; |
3413 | data.max_uV = max_uV; | |
3414 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3415 | &data); | |
3416 | if (ret & NOTIFY_STOP_MASK) | |
3417 | return -EINVAL; | |
3418 | ||
3419 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3420 | if (ret >= 0) | |
3421 | return ret; | |
3422 | ||
3423 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3424 | (void *)data.old_uV); | |
3425 | ||
3426 | return ret; | |
3427 | } | |
3428 | ||
3429 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3430 | int uV, unsigned selector) | |
3431 | { | |
3432 | struct pre_voltage_change_data data; | |
3433 | int ret; | |
3434 | ||
d22b85a1 | 3435 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3436 | data.min_uV = uV; |
3437 | data.max_uV = uV; | |
3438 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3439 | &data); | |
3440 | if (ret & NOTIFY_STOP_MASK) | |
3441 | return -EINVAL; | |
3442 | ||
3443 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3444 | if (ret >= 0) | |
3445 | return ret; | |
3446 | ||
3447 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3448 | (void *)data.old_uV); | |
3449 | ||
3450 | return ret; | |
3451 | } | |
3452 | ||
2da8d947 BG |
3453 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3454 | int uV, int new_selector) | |
3455 | { | |
3456 | const struct regulator_ops *ops = rdev->desc->ops; | |
3457 | int diff, old_sel, curr_sel, ret; | |
3458 | ||
3459 | /* Stepping is only needed if the regulator is enabled. */ | |
3460 | if (!_regulator_is_enabled(rdev)) | |
3461 | goto final_set; | |
3462 | ||
3463 | if (!ops->get_voltage_sel) | |
3464 | return -EINVAL; | |
3465 | ||
3466 | old_sel = ops->get_voltage_sel(rdev); | |
3467 | if (old_sel < 0) | |
3468 | return old_sel; | |
3469 | ||
3470 | diff = new_selector - old_sel; | |
3471 | if (diff == 0) | |
3472 | return 0; /* No change needed. */ | |
3473 | ||
3474 | if (diff > 0) { | |
3475 | /* Stepping up. */ | |
3476 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3477 | curr_sel < new_selector; | |
3478 | curr_sel += rdev->desc->vsel_step) { | |
3479 | /* | |
3480 | * Call the callback directly instead of using | |
3481 | * _regulator_call_set_voltage_sel() as we don't | |
3482 | * want to notify anyone yet. Same in the branch | |
3483 | * below. | |
3484 | */ | |
3485 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3486 | if (ret) | |
3487 | goto try_revert; | |
3488 | } | |
3489 | } else { | |
3490 | /* Stepping down. */ | |
3491 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3492 | curr_sel > new_selector; | |
3493 | curr_sel -= rdev->desc->vsel_step) { | |
3494 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3495 | if (ret) | |
3496 | goto try_revert; | |
3497 | } | |
3498 | } | |
3499 | ||
3500 | final_set: | |
3501 | /* The final selector will trigger the notifiers. */ | |
3502 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3503 | ||
3504 | try_revert: | |
3505 | /* | |
3506 | * At least try to return to the previous voltage if setting a new | |
3507 | * one failed. | |
3508 | */ | |
3509 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3510 | return ret; | |
3511 | } | |
3512 | ||
73e705bf MK |
3513 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3514 | int old_uV, int new_uV) | |
3515 | { | |
3516 | unsigned int ramp_delay = 0; | |
3517 | ||
3518 | if (rdev->constraints->ramp_delay) | |
3519 | ramp_delay = rdev->constraints->ramp_delay; | |
3520 | else if (rdev->desc->ramp_delay) | |
3521 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3522 | else if (rdev->constraints->settling_time) |
3523 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3524 | else if (rdev->constraints->settling_time_up && |
3525 | (new_uV > old_uV)) | |
3526 | return rdev->constraints->settling_time_up; | |
3527 | else if (rdev->constraints->settling_time_down && | |
3528 | (new_uV < old_uV)) | |
3529 | return rdev->constraints->settling_time_down; | |
73e705bf | 3530 | |
0739ce4c | 3531 | if (ramp_delay == 0) |
73e705bf | 3532 | return 0; |
73e705bf MK |
3533 | |
3534 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3535 | } | |
3536 | ||
75790251 MB |
3537 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3538 | int min_uV, int max_uV) | |
3539 | { | |
3540 | int ret; | |
77af1b26 | 3541 | int delay = 0; |
e113d792 | 3542 | int best_val = 0; |
75790251 | 3543 | unsigned int selector; |
eba41a5e | 3544 | int old_selector = -1; |
57995a48 | 3545 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3546 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3547 | |
3548 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3549 | ||
bf5892a8 MB |
3550 | min_uV += rdev->constraints->uV_offset; |
3551 | max_uV += rdev->constraints->uV_offset; | |
3552 | ||
eba41a5e AL |
3553 | /* |
3554 | * If we can't obtain the old selector there is not enough | |
3555 | * info to call set_voltage_time_sel(). | |
3556 | */ | |
8b7485ef | 3557 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3558 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3559 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3560 | if (old_selector < 0) |
3561 | return old_selector; | |
3562 | } | |
3563 | ||
57995a48 | 3564 | if (ops->set_voltage) { |
7179569a HS |
3565 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3566 | &selector); | |
e113d792 MB |
3567 | |
3568 | if (ret >= 0) { | |
57995a48 MK |
3569 | if (ops->list_voltage) |
3570 | best_val = ops->list_voltage(rdev, | |
3571 | selector); | |
e113d792 | 3572 | else |
d22b85a1 | 3573 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3574 | } |
3575 | ||
57995a48 | 3576 | } else if (ops->set_voltage_sel) { |
a204f41e | 3577 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3578 | if (ret >= 0) { |
57995a48 | 3579 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3580 | if (min_uV <= best_val && max_uV >= best_val) { |
3581 | selector = ret; | |
c66a566a AL |
3582 | if (old_selector == selector) |
3583 | ret = 0; | |
2da8d947 BG |
3584 | else if (rdev->desc->vsel_step) |
3585 | ret = _regulator_set_voltage_sel_step( | |
3586 | rdev, best_val, selector); | |
c66a566a | 3587 | else |
7179569a HS |
3588 | ret = _regulator_call_set_voltage_sel( |
3589 | rdev, best_val, selector); | |
e113d792 MB |
3590 | } else { |
3591 | ret = -EINVAL; | |
3592 | } | |
e8eef82b | 3593 | } |
75790251 MB |
3594 | } else { |
3595 | ret = -EINVAL; | |
3596 | } | |
e8eef82b | 3597 | |
31dfe686 MK |
3598 | if (ret) |
3599 | goto out; | |
77af1b26 | 3600 | |
73e705bf MK |
3601 | if (ops->set_voltage_time_sel) { |
3602 | /* | |
3603 | * Call set_voltage_time_sel if successfully obtained | |
3604 | * old_selector | |
3605 | */ | |
3606 | if (old_selector >= 0 && old_selector != selector) | |
3607 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3608 | selector); | |
3609 | } else { | |
3610 | if (old_uV != best_val) { | |
3611 | if (ops->set_voltage_time) | |
3612 | delay = ops->set_voltage_time(rdev, old_uV, | |
3613 | best_val); | |
3614 | else | |
3615 | delay = _regulator_set_voltage_time(rdev, | |
3616 | old_uV, | |
3617 | best_val); | |
e8eef82b | 3618 | } |
73e705bf | 3619 | } |
75790251 | 3620 | |
73e705bf | 3621 | if (delay < 0) { |
61aab5ad | 3622 | rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay)); |
73e705bf | 3623 | delay = 0; |
77af1b26 LW |
3624 | } |
3625 | ||
73e705bf | 3626 | /* Insert any necessary delays */ |
062920d2 | 3627 | _regulator_delay_helper(delay); |
77af1b26 | 3628 | |
31dfe686 | 3629 | if (best_val >= 0) { |
2f6c797f AL |
3630 | unsigned long data = best_val; |
3631 | ||
ded06a52 | 3632 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3633 | (void *)data); |
3634 | } | |
ded06a52 | 3635 | |
31dfe686 | 3636 | out: |
eba41a5e | 3637 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3638 | |
3639 | return ret; | |
3640 | } | |
3641 | ||
f7efad10 CZ |
3642 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3643 | int min_uV, int max_uV, suspend_state_t state) | |
3644 | { | |
3645 | struct regulator_state *rstate; | |
3646 | int uV, sel; | |
3647 | ||
3648 | rstate = regulator_get_suspend_state(rdev, state); | |
3649 | if (rstate == NULL) | |
3650 | return -EINVAL; | |
3651 | ||
3652 | if (min_uV < rstate->min_uV) | |
3653 | min_uV = rstate->min_uV; | |
3654 | if (max_uV > rstate->max_uV) | |
3655 | max_uV = rstate->max_uV; | |
3656 | ||
3657 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3658 | if (sel < 0) | |
3659 | return sel; | |
3660 | ||
3661 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3662 | if (uV >= min_uV && uV <= max_uV) | |
3663 | rstate->uV = uV; | |
3664 | ||
3665 | return 0; | |
3666 | } | |
3667 | ||
a9f226bc | 3668 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3669 | int min_uV, int max_uV, |
3670 | suspend_state_t state) | |
414c70cb LG |
3671 | { |
3672 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3673 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3674 | int ret = 0; |
92d7a558 | 3675 | int old_min_uV, old_max_uV; |
c00dc359 | 3676 | int current_uV; |
414c70cb | 3677 | |
95a3c23a MB |
3678 | /* If we're setting the same range as last time the change |
3679 | * should be a noop (some cpufreq implementations use the same | |
3680 | * voltage for multiple frequencies, for example). | |
3681 | */ | |
c360a6df | 3682 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3683 | goto out; |
3684 | ||
c00dc359 | 3685 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3686 | * return successfully even though the regulator does not support |
c00dc359 BA |
3687 | * changing the voltage. |
3688 | */ | |
8a34e979 | 3689 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3690 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3691 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3692 | voltage->min_uV = min_uV; |
3693 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3694 | goto out; |
3695 | } | |
3696 | } | |
3697 | ||
414c70cb | 3698 | /* sanity check */ |
e8eef82b MB |
3699 | if (!rdev->desc->ops->set_voltage && |
3700 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3701 | ret = -EINVAL; |
3702 | goto out; | |
3703 | } | |
3704 | ||
3705 | /* constraints check */ | |
3706 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3707 | if (ret < 0) | |
3708 | goto out; | |
0d25d09d | 3709 | |
92d7a558 | 3710 | /* restore original values in case of error */ |
c360a6df CZ |
3711 | old_min_uV = voltage->min_uV; |
3712 | old_max_uV = voltage->max_uV; | |
3713 | voltage->min_uV = min_uV; | |
3714 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3715 | |
9243a195 MP |
3716 | /* for not coupled regulators this will just set the voltage */ |
3717 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3718 | if (ret < 0) { |
3719 | voltage->min_uV = old_min_uV; | |
3720 | voltage->max_uV = old_max_uV; | |
3721 | } | |
05fda3b1 | 3722 | |
9243a195 | 3723 | out: |
9243a195 MP |
3724 | return ret; |
3725 | } | |
3726 | ||
d22b85a1 DO |
3727 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3728 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3729 | { |
3730 | int best_supply_uV = 0; | |
3731 | int supply_change_uV = 0; | |
3732 | int ret; | |
3733 | ||
43fc99f2 MB |
3734 | if (rdev->supply && |
3735 | regulator_ops_is_valid(rdev->supply->rdev, | |
3736 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3737 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3738 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3739 | int current_supply_uV; |
3740 | int selector; | |
3741 | ||
3742 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3743 | if (selector < 0) { | |
3744 | ret = selector; | |
9243a195 | 3745 | goto out; |
fc42112c SH |
3746 | } |
3747 | ||
00cb9f4f | 3748 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3749 | if (best_supply_uV < 0) { |
3750 | ret = best_supply_uV; | |
9243a195 | 3751 | goto out; |
fc42112c SH |
3752 | } |
3753 | ||
3754 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3755 | ||
d22b85a1 | 3756 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3757 | if (current_supply_uV < 0) { |
3758 | ret = current_supply_uV; | |
9243a195 | 3759 | goto out; |
fc42112c SH |
3760 | } |
3761 | ||
3762 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3763 | } | |
3764 | ||
3765 | if (supply_change_uV > 0) { | |
3766 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3767 | best_supply_uV, INT_MAX, state); |
fc42112c | 3768 | if (ret) { |
61aab5ad MM |
3769 | dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n", |
3770 | ERR_PTR(ret)); | |
9243a195 | 3771 | goto out; |
fc42112c SH |
3772 | } |
3773 | } | |
3774 | ||
f7efad10 CZ |
3775 | if (state == PM_SUSPEND_ON) |
3776 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3777 | else | |
3778 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3779 | max_uV, state); | |
92d7a558 | 3780 | if (ret < 0) |
9243a195 | 3781 | goto out; |
0d25d09d | 3782 | |
fc42112c SH |
3783 | if (supply_change_uV < 0) { |
3784 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3785 | best_supply_uV, INT_MAX, state); |
fc42112c | 3786 | if (ret) |
61aab5ad MM |
3787 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n", |
3788 | ERR_PTR(ret)); | |
fc42112c SH |
3789 | /* No need to fail here */ |
3790 | ret = 0; | |
3791 | } | |
3792 | ||
414c70cb | 3793 | out: |
a9f226bc | 3794 | return ret; |
69686176 | 3795 | } |
3d7610e8 | 3796 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3797 | |
85254bcf DO |
3798 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3799 | int *current_uV, int *min_uV) | |
3800 | { | |
3801 | struct regulation_constraints *constraints = rdev->constraints; | |
3802 | ||
3803 | /* Limit voltage change only if necessary */ | |
3804 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3805 | return 1; | |
3806 | ||
3807 | if (*current_uV < 0) { | |
d22b85a1 | 3808 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3809 | |
3810 | if (*current_uV < 0) | |
3811 | return *current_uV; | |
3812 | } | |
3813 | ||
3814 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3815 | return 1; | |
3816 | ||
3817 | /* Clamp target voltage within the given step */ | |
3818 | if (*current_uV < *min_uV) | |
3819 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3820 | *min_uV); | |
3821 | else | |
3822 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3823 | *min_uV); | |
3824 | ||
3825 | return 0; | |
3826 | } | |
3827 | ||
c054c6c7 MP |
3828 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3829 | int *current_uV, | |
3830 | int *min_uV, int *max_uV, | |
3831 | suspend_state_t state, | |
3832 | int n_coupled) | |
3833 | { | |
3834 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3835 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3836 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3837 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3838 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3839 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3840 | int i, ret, max_spread; |
c054c6c7 MP |
3841 | bool done; |
3842 | ||
3843 | *current_uV = -1; | |
3844 | ||
3845 | /* | |
3846 | * If there are no coupled regulators, simply set the voltage | |
3847 | * demanded by consumers. | |
3848 | */ | |
3849 | if (n_coupled == 1) { | |
3850 | /* | |
3851 | * If consumers don't provide any demands, set voltage | |
3852 | * to min_uV | |
3853 | */ | |
3854 | desired_min_uV = constraints->min_uV; | |
3855 | desired_max_uV = constraints->max_uV; | |
3856 | ||
3857 | ret = regulator_check_consumers(rdev, | |
3858 | &desired_min_uV, | |
3859 | &desired_max_uV, state); | |
3860 | if (ret < 0) | |
3861 | return ret; | |
3862 | ||
3863 | possible_uV = desired_min_uV; | |
3864 | done = true; | |
3865 | ||
3866 | goto finish; | |
3867 | } | |
3868 | ||
3869 | /* Find highest min desired voltage */ | |
3870 | for (i = 0; i < n_coupled; i++) { | |
3871 | int tmp_min = 0; | |
3872 | int tmp_max = INT_MAX; | |
3873 | ||
f8702f9e | 3874 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3875 | |
3876 | ret = regulator_check_consumers(c_rdevs[i], | |
3877 | &tmp_min, | |
3878 | &tmp_max, state); | |
3879 | if (ret < 0) | |
3880 | return ret; | |
3881 | ||
3882 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3883 | if (ret < 0) | |
3884 | return ret; | |
69686176 | 3885 | |
c054c6c7 MP |
3886 | highest_min_uV = max(highest_min_uV, tmp_min); |
3887 | ||
3888 | if (i == 0) { | |
3889 | desired_min_uV = tmp_min; | |
3890 | desired_max_uV = tmp_max; | |
3891 | } | |
3892 | } | |
3893 | ||
d8ca7d18 DO |
3894 | max_spread = constraints->max_spread[0]; |
3895 | ||
c054c6c7 MP |
3896 | /* |
3897 | * Let target_uV be equal to the desired one if possible. | |
3898 | * If not, set it to minimum voltage, allowed by other coupled | |
3899 | * regulators. | |
3900 | */ | |
3901 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3902 | ||
3903 | /* | |
3904 | * Find min and max voltages, which currently aren't violating | |
3905 | * max_spread. | |
3906 | */ | |
3907 | for (i = 1; i < n_coupled; i++) { | |
3908 | int tmp_act; | |
3909 | ||
3910 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3911 | continue; | |
3912 | ||
d22b85a1 | 3913 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3914 | if (tmp_act < 0) |
3915 | return tmp_act; | |
3916 | ||
3917 | min_current_uV = min(tmp_act, min_current_uV); | |
3918 | max_current_uV = max(tmp_act, max_current_uV); | |
3919 | } | |
3920 | ||
3921 | /* There aren't any other regulators enabled */ | |
3922 | if (max_current_uV == 0) { | |
3923 | possible_uV = target_uV; | |
3924 | } else { | |
3925 | /* | |
3926 | * Correct target voltage, so as it currently isn't | |
3927 | * violating max_spread | |
3928 | */ | |
3929 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3930 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3931 | } | |
3932 | ||
3933 | if (possible_uV > desired_max_uV) | |
3934 | return -EINVAL; | |
3935 | ||
3936 | done = (possible_uV == target_uV); | |
3937 | desired_min_uV = possible_uV; | |
3938 | ||
3939 | finish: | |
85254bcf DO |
3940 | /* Apply max_uV_step constraint if necessary */ |
3941 | if (state == PM_SUSPEND_ON) { | |
3942 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3943 | &desired_min_uV); | |
3944 | if (ret < 0) | |
3945 | return ret; | |
3946 | ||
3947 | if (ret == 0) | |
3948 | done = false; | |
3949 | } | |
3950 | ||
c054c6c7 MP |
3951 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3952 | if (n_coupled > 1 && *current_uV == -1) { | |
3953 | ||
3954 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3955 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3956 | if (ret < 0) |
3957 | return ret; | |
3958 | ||
3959 | *current_uV = ret; | |
3960 | } else { | |
3961 | *current_uV = desired_min_uV; | |
3962 | } | |
3963 | } | |
3964 | ||
3965 | *min_uV = desired_min_uV; | |
3966 | *max_uV = desired_max_uV; | |
3967 | ||
3968 | return done; | |
3969 | } | |
3970 | ||
752db83a MS |
3971 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3972 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3973 | { |
3974 | struct regulator_dev **c_rdevs; | |
3975 | struct regulator_dev *best_rdev; | |
3976 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3977 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3978 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3979 | unsigned long c_rdev_done = 0; |
3980 | bool best_c_rdev_done; | |
c054c6c7 MP |
3981 | |
3982 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3983 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3984 | |
3985 | /* | |
3986 | * Find the best possible voltage change on each loop. Leave the loop | |
3987 | * if there isn't any possible change. | |
3988 | */ | |
3989 | do { | |
3990 | best_c_rdev_done = false; | |
3991 | best_delta = 0; | |
3992 | best_min_uV = 0; | |
3993 | best_max_uV = 0; | |
3994 | best_c_rdev = 0; | |
3995 | best_rdev = NULL; | |
3996 | ||
3997 | /* | |
3998 | * Find highest difference between optimal voltage | |
3999 | * and current voltage. | |
4000 | */ | |
4001 | for (i = 0; i < n_coupled; i++) { | |
4002 | /* | |
4003 | * optimal_uV is the best voltage that can be set for | |
4004 | * i-th regulator at the moment without violating | |
4005 | * max_spread constraint in order to balance | |
4006 | * the coupled voltages. | |
4007 | */ | |
4008 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
4009 | ||
d8ca7d18 | 4010 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
4011 | continue; |
4012 | ||
4013 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
4014 | ¤t_uV, | |
4015 | &optimal_uV, | |
4016 | &optimal_max_uV, | |
4017 | state, n_coupled); | |
4018 | if (ret < 0) | |
4019 | goto out; | |
4020 | ||
4021 | delta = abs(optimal_uV - current_uV); | |
4022 | ||
4023 | if (delta && best_delta <= delta) { | |
4024 | best_c_rdev_done = ret; | |
4025 | best_delta = delta; | |
4026 | best_rdev = c_rdevs[i]; | |
4027 | best_min_uV = optimal_uV; | |
4028 | best_max_uV = optimal_max_uV; | |
4029 | best_c_rdev = i; | |
4030 | } | |
4031 | } | |
4032 | ||
4033 | /* Nothing to change, return successfully */ | |
4034 | if (!best_rdev) { | |
4035 | ret = 0; | |
4036 | goto out; | |
4037 | } | |
9243a195 | 4038 | |
c054c6c7 MP |
4039 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
4040 | best_max_uV, state); | |
9243a195 | 4041 | |
c054c6c7 MP |
4042 | if (ret < 0) |
4043 | goto out; | |
4044 | ||
d8ca7d18 DO |
4045 | if (best_c_rdev_done) |
4046 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
4047 | |
4048 | } while (n_coupled > 1); | |
4049 | ||
4050 | out: | |
69686176 MP |
4051 | return ret; |
4052 | } | |
4053 | ||
752db83a MS |
4054 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
4055 | suspend_state_t state) | |
4056 | { | |
4057 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
4058 | struct regulator_coupler *coupler = c_desc->coupler; | |
4059 | bool skip_coupled = false; | |
4060 | ||
4061 | /* | |
4062 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
4063 | * other coupled regulators. | |
4064 | */ | |
4065 | if (state != PM_SUSPEND_ON) | |
4066 | skip_coupled = true; | |
4067 | ||
4068 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
4069 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
4070 | return -EPERM; | |
4071 | } | |
4072 | ||
4073 | /* Invoke custom balancer for customized couplers */ | |
4074 | if (coupler && coupler->balance_voltage) | |
4075 | return coupler->balance_voltage(coupler, rdev, state); | |
4076 | ||
4077 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
4078 | } | |
4079 | ||
a9f226bc SH |
4080 | /** |
4081 | * regulator_set_voltage - set regulator output voltage | |
4082 | * @regulator: regulator source | |
4083 | * @min_uV: Minimum required voltage in uV | |
4084 | * @max_uV: Maximum acceptable voltage in uV | |
4085 | * | |
4086 | * Sets a voltage regulator to the desired output voltage. This can be set | |
4087 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
4088 | * | |
4089 | * If the regulator is enabled then the voltage will change to the new value | |
4090 | * immediately otherwise if the regulator is disabled the regulator will | |
4091 | * output at the new voltage when enabled. | |
4092 | * | |
4093 | * NOTE: If the regulator is shared between several devices then the lowest | |
4094 | * request voltage that meets the system constraints will be used. | |
4095 | * Regulator system constraints must be set for this regulator before | |
4096 | * calling this function otherwise this call will fail. | |
4097 | */ | |
4098 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
4099 | { | |
f8702f9e DO |
4100 | struct ww_acquire_ctx ww_ctx; |
4101 | int ret; | |
a9f226bc | 4102 | |
f8702f9e | 4103 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 4104 | |
c360a6df CZ |
4105 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
4106 | PM_SUSPEND_ON); | |
a9f226bc | 4107 | |
f8702f9e | 4108 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 4109 | |
414c70cb LG |
4110 | return ret; |
4111 | } | |
4112 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
4113 | ||
f7efad10 CZ |
4114 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
4115 | suspend_state_t state, bool en) | |
4116 | { | |
4117 | struct regulator_state *rstate; | |
4118 | ||
4119 | rstate = regulator_get_suspend_state(rdev, state); | |
4120 | if (rstate == NULL) | |
4121 | return -EINVAL; | |
4122 | ||
4123 | if (!rstate->changeable) | |
4124 | return -EPERM; | |
4125 | ||
3edd79cf | 4126 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
4127 | |
4128 | return 0; | |
4129 | } | |
4130 | ||
4131 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
4132 | suspend_state_t state) | |
4133 | { | |
4134 | return regulator_suspend_toggle(rdev, state, true); | |
4135 | } | |
4136 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
4137 | ||
4138 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
4139 | suspend_state_t state) | |
4140 | { | |
4141 | struct regulator *regulator; | |
4142 | struct regulator_voltage *voltage; | |
4143 | ||
4144 | /* | |
4145 | * if any consumer wants this regulator device keeping on in | |
4146 | * suspend states, don't set it as disabled. | |
4147 | */ | |
4148 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4149 | voltage = ®ulator->voltage[state]; | |
4150 | if (voltage->min_uV || voltage->max_uV) | |
4151 | return 0; | |
4152 | } | |
4153 | ||
4154 | return regulator_suspend_toggle(rdev, state, false); | |
4155 | } | |
4156 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
4157 | ||
4158 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
4159 | int min_uV, int max_uV, | |
4160 | suspend_state_t state) | |
4161 | { | |
4162 | struct regulator_dev *rdev = regulator->rdev; | |
4163 | struct regulator_state *rstate; | |
4164 | ||
4165 | rstate = regulator_get_suspend_state(rdev, state); | |
4166 | if (rstate == NULL) | |
4167 | return -EINVAL; | |
4168 | ||
4169 | if (rstate->min_uV == rstate->max_uV) { | |
4170 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
4171 | return -EPERM; | |
4172 | } | |
4173 | ||
4174 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
4175 | } | |
4176 | ||
4177 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
4178 | int max_uV, suspend_state_t state) | |
4179 | { | |
f8702f9e DO |
4180 | struct ww_acquire_ctx ww_ctx; |
4181 | int ret; | |
f7efad10 CZ |
4182 | |
4183 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
4184 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
4185 | return -EINVAL; | |
4186 | ||
f8702f9e | 4187 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4188 | |
4189 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
4190 | max_uV, state); | |
4191 | ||
f8702f9e | 4192 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4193 | |
4194 | return ret; | |
4195 | } | |
4196 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
4197 | ||
88cd222b LW |
4198 | /** |
4199 | * regulator_set_voltage_time - get raise/fall time | |
4200 | * @regulator: regulator source | |
4201 | * @old_uV: starting voltage in microvolts | |
4202 | * @new_uV: target voltage in microvolts | |
4203 | * | |
4204 | * Provided with the starting and ending voltage, this function attempts to | |
4205 | * calculate the time in microseconds required to rise or fall to this new | |
4206 | * voltage. | |
4207 | */ | |
4208 | int regulator_set_voltage_time(struct regulator *regulator, | |
4209 | int old_uV, int new_uV) | |
4210 | { | |
272e2315 GX |
4211 | struct regulator_dev *rdev = regulator->rdev; |
4212 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
4213 | int old_sel = -1; |
4214 | int new_sel = -1; | |
4215 | int voltage; | |
4216 | int i; | |
4217 | ||
73e705bf MK |
4218 | if (ops->set_voltage_time) |
4219 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
4220 | else if (!ops->set_voltage_time_sel) | |
4221 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
4222 | ||
88cd222b | 4223 | /* Currently requires operations to do this */ |
73e705bf | 4224 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
4225 | return -EINVAL; |
4226 | ||
4227 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
4228 | /* We only look for exact voltage matches here */ | |
bdcd1177 CB |
4229 | if (i < rdev->desc->linear_min_sel) |
4230 | continue; | |
4231 | ||
ab97800e CB |
4232 | if (old_sel >= 0 && new_sel >= 0) |
4233 | break; | |
4234 | ||
88cd222b LW |
4235 | voltage = regulator_list_voltage(regulator, i); |
4236 | if (voltage < 0) | |
4237 | return -EINVAL; | |
4238 | if (voltage == 0) | |
4239 | continue; | |
4240 | if (voltage == old_uV) | |
4241 | old_sel = i; | |
4242 | if (voltage == new_uV) | |
4243 | new_sel = i; | |
4244 | } | |
4245 | ||
4246 | if (old_sel < 0 || new_sel < 0) | |
4247 | return -EINVAL; | |
4248 | ||
4249 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
4250 | } | |
4251 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
4252 | ||
98a175b6 | 4253 | /** |
296c6566 RD |
4254 | * regulator_set_voltage_time_sel - get raise/fall time |
4255 | * @rdev: regulator source device | |
98a175b6 YSB |
4256 | * @old_selector: selector for starting voltage |
4257 | * @new_selector: selector for target voltage | |
4258 | * | |
4259 | * Provided with the starting and target voltage selectors, this function | |
4260 | * returns time in microseconds required to rise or fall to this new voltage | |
4261 | * | |
f11d08c3 | 4262 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4263 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4264 | */ |
4265 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4266 | unsigned int old_selector, | |
4267 | unsigned int new_selector) | |
4268 | { | |
f11d08c3 | 4269 | int old_volt, new_volt; |
398715ab | 4270 | |
f11d08c3 AL |
4271 | /* sanity check */ |
4272 | if (!rdev->desc->ops->list_voltage) | |
4273 | return -EINVAL; | |
398715ab | 4274 | |
f11d08c3 AL |
4275 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4276 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4277 | ||
73e705bf MK |
4278 | if (rdev->desc->ops->set_voltage_time) |
4279 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4280 | new_volt); | |
4281 | else | |
4282 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4283 | } |
b19dbf71 | 4284 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4285 | |
380d2b2d DO |
4286 | int regulator_sync_voltage_rdev(struct regulator_dev *rdev) |
4287 | { | |
4288 | int ret; | |
4289 | ||
4290 | regulator_lock(rdev); | |
4291 | ||
4292 | if (!rdev->desc->ops->set_voltage && | |
4293 | !rdev->desc->ops->set_voltage_sel) { | |
4294 | ret = -EINVAL; | |
4295 | goto out; | |
4296 | } | |
4297 | ||
4298 | /* balance only, if regulator is coupled */ | |
4299 | if (rdev->coupling_desc.n_coupled > 1) | |
4300 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4301 | else | |
4302 | ret = -EOPNOTSUPP; | |
4303 | ||
4304 | out: | |
4305 | regulator_unlock(rdev); | |
4306 | return ret; | |
4307 | } | |
4308 | ||
606a2562 MB |
4309 | /** |
4310 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4311 | * @regulator: regulator source | |
4312 | * | |
4313 | * Re-apply the last configured voltage. This is intended to be used | |
4314 | * where some external control source the consumer is cooperating with | |
4315 | * has caused the configured voltage to change. | |
4316 | */ | |
4317 | int regulator_sync_voltage(struct regulator *regulator) | |
4318 | { | |
4319 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4320 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4321 | int ret, min_uV, max_uV; |
4322 | ||
400d5a5d DO |
4323 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4324 | return 0; | |
4325 | ||
66cf9a7e | 4326 | regulator_lock(rdev); |
606a2562 MB |
4327 | |
4328 | if (!rdev->desc->ops->set_voltage && | |
4329 | !rdev->desc->ops->set_voltage_sel) { | |
4330 | ret = -EINVAL; | |
4331 | goto out; | |
4332 | } | |
4333 | ||
4334 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4335 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4336 | ret = -EINVAL; |
4337 | goto out; | |
4338 | } | |
4339 | ||
c360a6df CZ |
4340 | min_uV = voltage->min_uV; |
4341 | max_uV = voltage->max_uV; | |
606a2562 MB |
4342 | |
4343 | /* This should be a paranoia check... */ | |
4344 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4345 | if (ret < 0) | |
4346 | goto out; | |
4347 | ||
c360a6df | 4348 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4349 | if (ret < 0) |
4350 | goto out; | |
4351 | ||
24be0c71 DO |
4352 | /* balance only, if regulator is coupled */ |
4353 | if (rdev->coupling_desc.n_coupled > 1) | |
4354 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4355 | else | |
4356 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
606a2562 MB |
4357 | |
4358 | out: | |
66cf9a7e | 4359 | regulator_unlock(rdev); |
606a2562 MB |
4360 | return ret; |
4361 | } | |
4362 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4363 | ||
d22b85a1 | 4364 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4365 | { |
bf5892a8 | 4366 | int sel, ret; |
fef95019 MB |
4367 | bool bypassed; |
4368 | ||
4369 | if (rdev->desc->ops->get_bypass) { | |
4370 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4371 | if (ret < 0) | |
4372 | return ret; | |
4373 | if (bypassed) { | |
4374 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4375 | if (!rdev->supply) { |
4376 | rdev_err(rdev, | |
4377 | "bypassed regulator has no supply!\n"); | |
4378 | return -EPROBE_DEFER; | |
4379 | } | |
fef95019 | 4380 | |
d22b85a1 | 4381 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4382 | } |
4383 | } | |
476c2d83 MB |
4384 | |
4385 | if (rdev->desc->ops->get_voltage_sel) { | |
4386 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4387 | if (sel < 0) | |
4388 | return sel; | |
bf5892a8 | 4389 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4390 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4391 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4392 | } else if (rdev->desc->ops->list_voltage) { |
4393 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4394 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4395 | ret = rdev->desc->fixed_uV; | |
e303996e | 4396 | } else if (rdev->supply) { |
d22b85a1 | 4397 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cf1ad559 MM |
4398 | } else if (rdev->supply_name) { |
4399 | return -EPROBE_DEFER; | |
cb220d16 | 4400 | } else { |
414c70cb | 4401 | return -EINVAL; |
cb220d16 | 4402 | } |
bf5892a8 | 4403 | |
cb220d16 AL |
4404 | if (ret < 0) |
4405 | return ret; | |
bf5892a8 | 4406 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4407 | } |
3d7610e8 | 4408 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4409 | |
4410 | /** | |
4411 | * regulator_get_voltage - get regulator output voltage | |
4412 | * @regulator: regulator source | |
4413 | * | |
4414 | * This returns the current regulator voltage in uV. | |
4415 | * | |
4416 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4417 | * function should not be used to determine regulator state. | |
4418 | */ | |
4419 | int regulator_get_voltage(struct regulator *regulator) | |
4420 | { | |
f8702f9e | 4421 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4422 | int ret; |
4423 | ||
f8702f9e | 4424 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4425 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4426 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4427 | |
4428 | return ret; | |
4429 | } | |
4430 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4431 | ||
4432 | /** | |
4433 | * regulator_set_current_limit - set regulator output current limit | |
4434 | * @regulator: regulator source | |
ce0d10f8 | 4435 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4436 | * @max_uA: Maximum supported current in uA |
4437 | * | |
4438 | * Sets current sink to the desired output current. This can be set during | |
4439 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4440 | * | |
4441 | * If the regulator is enabled then the current will change to the new value | |
4442 | * immediately otherwise if the regulator is disabled the regulator will | |
4443 | * output at the new current when enabled. | |
4444 | * | |
4445 | * NOTE: Regulator system constraints must be set for this regulator before | |
4446 | * calling this function otherwise this call will fail. | |
4447 | */ | |
4448 | int regulator_set_current_limit(struct regulator *regulator, | |
4449 | int min_uA, int max_uA) | |
4450 | { | |
4451 | struct regulator_dev *rdev = regulator->rdev; | |
4452 | int ret; | |
4453 | ||
66cf9a7e | 4454 | regulator_lock(rdev); |
414c70cb LG |
4455 | |
4456 | /* sanity check */ | |
4457 | if (!rdev->desc->ops->set_current_limit) { | |
4458 | ret = -EINVAL; | |
4459 | goto out; | |
4460 | } | |
4461 | ||
4462 | /* constraints check */ | |
4463 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4464 | if (ret < 0) | |
4465 | goto out; | |
4466 | ||
4467 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4468 | out: | |
66cf9a7e | 4469 | regulator_unlock(rdev); |
414c70cb LG |
4470 | return ret; |
4471 | } | |
4472 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4473 | ||
7e4d9683 DA |
4474 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4475 | { | |
4476 | /* sanity check */ | |
4477 | if (!rdev->desc->ops->get_current_limit) | |
4478 | return -EINVAL; | |
4479 | ||
4480 | return rdev->desc->ops->get_current_limit(rdev); | |
4481 | } | |
4482 | ||
414c70cb LG |
4483 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4484 | { | |
4485 | int ret; | |
4486 | ||
66cf9a7e | 4487 | regulator_lock(rdev); |
7e4d9683 | 4488 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4489 | regulator_unlock(rdev); |
7e4d9683 | 4490 | |
414c70cb LG |
4491 | return ret; |
4492 | } | |
4493 | ||
4494 | /** | |
4495 | * regulator_get_current_limit - get regulator output current | |
4496 | * @regulator: regulator source | |
4497 | * | |
4498 | * This returns the current supplied by the specified current sink in uA. | |
4499 | * | |
4500 | * NOTE: If the regulator is disabled it will return the current value. This | |
4501 | * function should not be used to determine regulator state. | |
4502 | */ | |
4503 | int regulator_get_current_limit(struct regulator *regulator) | |
4504 | { | |
4505 | return _regulator_get_current_limit(regulator->rdev); | |
4506 | } | |
4507 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4508 | ||
4509 | /** | |
4510 | * regulator_set_mode - set regulator operating mode | |
4511 | * @regulator: regulator source | |
4512 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4513 | * | |
4514 | * Set regulator operating mode to increase regulator efficiency or improve | |
4515 | * regulation performance. | |
4516 | * | |
4517 | * NOTE: Regulator system constraints must be set for this regulator before | |
4518 | * calling this function otherwise this call will fail. | |
4519 | */ | |
4520 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4521 | { | |
4522 | struct regulator_dev *rdev = regulator->rdev; | |
4523 | int ret; | |
500b4ac9 | 4524 | int regulator_curr_mode; |
414c70cb | 4525 | |
66cf9a7e | 4526 | regulator_lock(rdev); |
414c70cb LG |
4527 | |
4528 | /* sanity check */ | |
4529 | if (!rdev->desc->ops->set_mode) { | |
4530 | ret = -EINVAL; | |
4531 | goto out; | |
4532 | } | |
4533 | ||
500b4ac9 SI |
4534 | /* return if the same mode is requested */ |
4535 | if (rdev->desc->ops->get_mode) { | |
4536 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4537 | if (regulator_curr_mode == mode) { | |
4538 | ret = 0; | |
4539 | goto out; | |
4540 | } | |
4541 | } | |
4542 | ||
414c70cb | 4543 | /* constraints check */ |
22c51b47 | 4544 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4545 | if (ret < 0) |
4546 | goto out; | |
4547 | ||
4548 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4549 | out: | |
66cf9a7e | 4550 | regulator_unlock(rdev); |
414c70cb LG |
4551 | return ret; |
4552 | } | |
4553 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4554 | ||
7e4d9683 DA |
4555 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4556 | { | |
4557 | /* sanity check */ | |
4558 | if (!rdev->desc->ops->get_mode) | |
4559 | return -EINVAL; | |
4560 | ||
4561 | return rdev->desc->ops->get_mode(rdev); | |
4562 | } | |
4563 | ||
414c70cb LG |
4564 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4565 | { | |
4566 | int ret; | |
4567 | ||
66cf9a7e | 4568 | regulator_lock(rdev); |
7e4d9683 | 4569 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4570 | regulator_unlock(rdev); |
7e4d9683 | 4571 | |
414c70cb LG |
4572 | return ret; |
4573 | } | |
4574 | ||
4575 | /** | |
4576 | * regulator_get_mode - get regulator operating mode | |
4577 | * @regulator: regulator source | |
4578 | * | |
4579 | * Get the current regulator operating mode. | |
4580 | */ | |
4581 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4582 | { | |
4583 | return _regulator_get_mode(regulator->rdev); | |
4584 | } | |
4585 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4586 | ||
7111c6d1 MV |
4587 | static int rdev_get_cached_err_flags(struct regulator_dev *rdev) |
4588 | { | |
4589 | int ret = 0; | |
4590 | ||
4591 | if (rdev->use_cached_err) { | |
4592 | spin_lock(&rdev->err_lock); | |
4593 | ret = rdev->cached_err; | |
4594 | spin_unlock(&rdev->err_lock); | |
4595 | } | |
4596 | return ret; | |
4597 | } | |
4598 | ||
1b5b4221 AH |
4599 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4600 | unsigned int *flags) | |
4601 | { | |
7111c6d1 | 4602 | int cached_flags, ret = 0; |
1b5b4221 | 4603 | |
66cf9a7e | 4604 | regulator_lock(rdev); |
1b5b4221 | 4605 | |
7111c6d1 MV |
4606 | cached_flags = rdev_get_cached_err_flags(rdev); |
4607 | ||
4608 | if (rdev->desc->ops->get_error_flags) | |
4609 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4610 | else if (!rdev->use_cached_err) | |
1b5b4221 | 4611 | ret = -EINVAL; |
1b5b4221 | 4612 | |
7111c6d1 MV |
4613 | *flags |= cached_flags; |
4614 | ||
66cf9a7e | 4615 | regulator_unlock(rdev); |
7111c6d1 | 4616 | |
1b5b4221 AH |
4617 | return ret; |
4618 | } | |
4619 | ||
4620 | /** | |
4621 | * regulator_get_error_flags - get regulator error information | |
4622 | * @regulator: regulator source | |
4623 | * @flags: pointer to store error flags | |
4624 | * | |
4625 | * Get the current regulator error information. | |
4626 | */ | |
4627 | int regulator_get_error_flags(struct regulator *regulator, | |
4628 | unsigned int *flags) | |
4629 | { | |
4630 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4631 | } | |
4632 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4633 | ||
414c70cb | 4634 | /** |
e39ce48f | 4635 | * regulator_set_load - set regulator load |
414c70cb LG |
4636 | * @regulator: regulator source |
4637 | * @uA_load: load current | |
4638 | * | |
4639 | * Notifies the regulator core of a new device load. This is then used by | |
4640 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4641 | * operating mode for the new regulator loading. | |
4642 | * | |
4643 | * Consumer devices notify their supply regulator of the maximum power | |
4644 | * they will require (can be taken from device datasheet in the power | |
4645 | * consumption tables) when they change operational status and hence power | |
4646 | * state. Examples of operational state changes that can affect power | |
4647 | * consumption are :- | |
4648 | * | |
4649 | * o Device is opened / closed. | |
4650 | * o Device I/O is about to begin or has just finished. | |
4651 | * o Device is idling in between work. | |
4652 | * | |
4653 | * This information is also exported via sysfs to userspace. | |
4654 | * | |
4655 | * DRMS will sum the total requested load on the regulator and change | |
4656 | * to the most efficient operating mode if platform constraints allow. | |
4657 | * | |
5451781d DA |
4658 | * NOTE: when a regulator consumer requests to have a regulator |
4659 | * disabled then any load that consumer requested no longer counts | |
4660 | * toward the total requested load. If the regulator is re-enabled | |
4661 | * then the previously requested load will start counting again. | |
4662 | * | |
4663 | * If a regulator is an always-on regulator then an individual consumer's | |
4664 | * load will still be removed if that consumer is fully disabled. | |
4665 | * | |
e39ce48f | 4666 | * On error a negative errno is returned. |
414c70cb | 4667 | */ |
e39ce48f | 4668 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4669 | { |
4670 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4671 | int old_uA_load; |
4672 | int ret = 0; | |
d92d95b6 | 4673 | |
66cf9a7e | 4674 | regulator_lock(rdev); |
5451781d | 4675 | old_uA_load = regulator->uA_load; |
414c70cb | 4676 | regulator->uA_load = uA_load; |
5451781d DA |
4677 | if (regulator->enable_count && old_uA_load != uA_load) { |
4678 | ret = drms_uA_update(rdev); | |
4679 | if (ret < 0) | |
4680 | regulator->uA_load = old_uA_load; | |
4681 | } | |
66cf9a7e | 4682 | regulator_unlock(rdev); |
8460ef38 | 4683 | |
414c70cb LG |
4684 | return ret; |
4685 | } | |
e39ce48f | 4686 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4687 | |
f59c8f9f MB |
4688 | /** |
4689 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4690 | * | |
4691 | * @regulator: Regulator to configure | |
9345dfb8 | 4692 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4693 | * |
4694 | * Allow the regulator to go into bypass mode if all other consumers | |
4695 | * for the regulator also enable bypass mode and the machine | |
4696 | * constraints allow this. Bypass mode means that the regulator is | |
4697 | * simply passing the input directly to the output with no regulation. | |
4698 | */ | |
4699 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4700 | { | |
4701 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4702 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4703 | int ret = 0; |
4704 | ||
4705 | if (!rdev->desc->ops->set_bypass) | |
4706 | return 0; | |
4707 | ||
8a34e979 | 4708 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4709 | return 0; |
4710 | ||
66cf9a7e | 4711 | regulator_lock(rdev); |
f59c8f9f MB |
4712 | |
4713 | if (enable && !regulator->bypass) { | |
4714 | rdev->bypass_count++; | |
4715 | ||
4716 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4717 | trace_regulator_bypass_enable(name); |
4718 | ||
f59c8f9f MB |
4719 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4720 | if (ret != 0) | |
4721 | rdev->bypass_count--; | |
48325655 CK |
4722 | else |
4723 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4724 | } |
4725 | ||
4726 | } else if (!enable && regulator->bypass) { | |
4727 | rdev->bypass_count--; | |
4728 | ||
4729 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4730 | trace_regulator_bypass_disable(name); |
4731 | ||
f59c8f9f MB |
4732 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4733 | if (ret != 0) | |
4734 | rdev->bypass_count++; | |
48325655 CK |
4735 | else |
4736 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4737 | } |
4738 | } | |
4739 | ||
4740 | if (ret == 0) | |
4741 | regulator->bypass = enable; | |
4742 | ||
66cf9a7e | 4743 | regulator_unlock(rdev); |
f59c8f9f MB |
4744 | |
4745 | return ret; | |
4746 | } | |
4747 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4748 | ||
414c70cb LG |
4749 | /** |
4750 | * regulator_register_notifier - register regulator event notifier | |
4751 | * @regulator: regulator source | |
69279fb9 | 4752 | * @nb: notifier block |
414c70cb LG |
4753 | * |
4754 | * Register notifier block to receive regulator events. | |
4755 | */ | |
4756 | int regulator_register_notifier(struct regulator *regulator, | |
4757 | struct notifier_block *nb) | |
4758 | { | |
4759 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4760 | nb); | |
4761 | } | |
4762 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4763 | ||
4764 | /** | |
4765 | * regulator_unregister_notifier - unregister regulator event notifier | |
4766 | * @regulator: regulator source | |
69279fb9 | 4767 | * @nb: notifier block |
414c70cb LG |
4768 | * |
4769 | * Unregister regulator event notifier block. | |
4770 | */ | |
4771 | int regulator_unregister_notifier(struct regulator *regulator, | |
4772 | struct notifier_block *nb) | |
4773 | { | |
4774 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4775 | nb); | |
4776 | } | |
4777 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4778 | ||
b136fb44 JC |
4779 | /* notify regulator consumers and downstream regulator consumers. |
4780 | * Note mutex must be held by caller. | |
4781 | */ | |
7179569a | 4782 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4783 | unsigned long event, void *data) |
4784 | { | |
414c70cb | 4785 | /* call rdev chain first */ |
7179569a | 4786 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4787 | } |
4788 | ||
fd184506 ZW |
4789 | int _regulator_bulk_get(struct device *dev, int num_consumers, |
4790 | struct regulator_bulk_data *consumers, enum regulator_get_type get_type) | |
414c70cb LG |
4791 | { |
4792 | int i; | |
4793 | int ret; | |
4794 | ||
4795 | for (i = 0; i < num_consumers; i++) | |
4796 | consumers[i].consumer = NULL; | |
4797 | ||
4798 | for (i = 0; i < num_consumers; i++) { | |
fd184506 ZW |
4799 | consumers[i].consumer = _regulator_get(dev, |
4800 | consumers[i].supply, get_type); | |
414c70cb | 4801 | if (IS_ERR(consumers[i].consumer)) { |
6eabfc01 DA |
4802 | ret = dev_err_probe(dev, PTR_ERR(consumers[i].consumer), |
4803 | "Failed to get supply '%s'", | |
4804 | consumers[i].supply); | |
d511e8a7 | 4805 | consumers[i].consumer = NULL; |
414c70cb LG |
4806 | goto err; |
4807 | } | |
6eabfc01 DA |
4808 | |
4809 | if (consumers[i].init_load_uA > 0) { | |
4810 | ret = regulator_set_load(consumers[i].consumer, | |
4811 | consumers[i].init_load_uA); | |
4812 | if (ret) { | |
4813 | i++; | |
4814 | goto err; | |
4815 | } | |
4816 | } | |
414c70cb LG |
4817 | } |
4818 | ||
4819 | return 0; | |
4820 | ||
4821 | err: | |
b29c7690 | 4822 | while (--i >= 0) |
414c70cb LG |
4823 | regulator_put(consumers[i].consumer); |
4824 | ||
4825 | return ret; | |
4826 | } | |
fd184506 ZW |
4827 | |
4828 | /** | |
4829 | * regulator_bulk_get - get multiple regulator consumers | |
4830 | * | |
4831 | * @dev: Device to supply | |
4832 | * @num_consumers: Number of consumers to register | |
4833 | * @consumers: Configuration of consumers; clients are stored here. | |
4834 | * | |
4835 | * @return 0 on success, an errno on failure. | |
4836 | * | |
4837 | * This helper function allows drivers to get several regulator | |
4838 | * consumers in one operation. If any of the regulators cannot be | |
4839 | * acquired then any regulators that were allocated will be freed | |
4840 | * before returning to the caller. | |
4841 | */ | |
4842 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4843 | struct regulator_bulk_data *consumers) | |
4844 | { | |
4845 | return _regulator_bulk_get(dev, num_consumers, consumers, NORMAL_GET); | |
4846 | } | |
414c70cb LG |
4847 | EXPORT_SYMBOL_GPL(regulator_bulk_get); |
4848 | ||
f21e0e81 MB |
4849 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4850 | { | |
4851 | struct regulator_bulk_data *bulk = data; | |
4852 | ||
4853 | bulk->ret = regulator_enable(bulk->consumer); | |
4854 | } | |
4855 | ||
414c70cb LG |
4856 | /** |
4857 | * regulator_bulk_enable - enable multiple regulator consumers | |
4858 | * | |
4859 | * @num_consumers: Number of consumers | |
4860 | * @consumers: Consumer data; clients are stored here. | |
4861 | * @return 0 on success, an errno on failure | |
4862 | * | |
4863 | * This convenience API allows consumers to enable multiple regulator | |
4864 | * clients in a single API call. If any consumers cannot be enabled | |
4865 | * then any others that were enabled will be disabled again prior to | |
4866 | * return. | |
4867 | */ | |
4868 | int regulator_bulk_enable(int num_consumers, | |
4869 | struct regulator_bulk_data *consumers) | |
4870 | { | |
2955b47d | 4871 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4872 | int i; |
f21e0e81 | 4873 | int ret = 0; |
414c70cb | 4874 | |
6492bc1b | 4875 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4876 | async_schedule_domain(regulator_bulk_enable_async, |
4877 | &consumers[i], &async_domain); | |
6492bc1b | 4878 | } |
f21e0e81 MB |
4879 | |
4880 | async_synchronize_full_domain(&async_domain); | |
4881 | ||
4882 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4883 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4884 | if (consumers[i].ret != 0) { |
4885 | ret = consumers[i].ret; | |
414c70cb | 4886 | goto err; |
f21e0e81 | 4887 | } |
414c70cb LG |
4888 | } |
4889 | ||
4890 | return 0; | |
4891 | ||
4892 | err: | |
fbe31057 AH |
4893 | for (i = 0; i < num_consumers; i++) { |
4894 | if (consumers[i].ret < 0) | |
61aab5ad MM |
4895 | pr_err("Failed to enable %s: %pe\n", consumers[i].supply, |
4896 | ERR_PTR(consumers[i].ret)); | |
fbe31057 AH |
4897 | else |
4898 | regulator_disable(consumers[i].consumer); | |
4899 | } | |
414c70cb LG |
4900 | |
4901 | return ret; | |
4902 | } | |
4903 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4904 | ||
4905 | /** | |
4906 | * regulator_bulk_disable - disable multiple regulator consumers | |
4907 | * | |
4908 | * @num_consumers: Number of consumers | |
4909 | * @consumers: Consumer data; clients are stored here. | |
4910 | * @return 0 on success, an errno on failure | |
4911 | * | |
4912 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4913 | * clients in a single API call. If any consumers cannot be disabled |
4914 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4915 | * return. |
4916 | */ | |
4917 | int regulator_bulk_disable(int num_consumers, | |
4918 | struct regulator_bulk_data *consumers) | |
4919 | { | |
4920 | int i; | |
01e86f49 | 4921 | int ret, r; |
414c70cb | 4922 | |
49e22632 | 4923 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4924 | ret = regulator_disable(consumers[i].consumer); |
4925 | if (ret != 0) | |
4926 | goto err; | |
4927 | } | |
4928 | ||
4929 | return 0; | |
4930 | ||
4931 | err: | |
61aab5ad | 4932 | pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret)); |
01e86f49 MB |
4933 | for (++i; i < num_consumers; ++i) { |
4934 | r = regulator_enable(consumers[i].consumer); | |
4935 | if (r != 0) | |
61aab5ad MM |
4936 | pr_err("Failed to re-enable %s: %pe\n", |
4937 | consumers[i].supply, ERR_PTR(r)); | |
01e86f49 | 4938 | } |
414c70cb LG |
4939 | |
4940 | return ret; | |
4941 | } | |
4942 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4943 | ||
e1de2f42 DK |
4944 | /** |
4945 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4946 | * | |
4947 | * @num_consumers: Number of consumers | |
4948 | * @consumers: Consumer data; clients are stored here. | |
4949 | * @return 0 on success, an errno on failure | |
4950 | * | |
4951 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4952 | * clients in a single API call. | |
4953 | * NOTE: This should be used for situations when device damage will | |
4954 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4955 | * Although regulator_force_disable function call for some consumers can | |
4956 | * return error numbers, the function is called for all consumers. | |
4957 | */ | |
4958 | int regulator_bulk_force_disable(int num_consumers, | |
4959 | struct regulator_bulk_data *consumers) | |
4960 | { | |
4961 | int i; | |
b8c77ff6 | 4962 | int ret = 0; |
e1de2f42 | 4963 | |
b8c77ff6 | 4964 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4965 | consumers[i].ret = |
4966 | regulator_force_disable(consumers[i].consumer); | |
4967 | ||
b8c77ff6 DT |
4968 | /* Store first error for reporting */ |
4969 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4970 | ret = consumers[i].ret; |
e1de2f42 DK |
4971 | } |
4972 | ||
e1de2f42 DK |
4973 | return ret; |
4974 | } | |
4975 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4976 | ||
414c70cb LG |
4977 | /** |
4978 | * regulator_bulk_free - free multiple regulator consumers | |
4979 | * | |
4980 | * @num_consumers: Number of consumers | |
4981 | * @consumers: Consumer data; clients are stored here. | |
4982 | * | |
4983 | * This convenience API allows consumers to free multiple regulator | |
4984 | * clients in a single API call. | |
4985 | */ | |
4986 | void regulator_bulk_free(int num_consumers, | |
4987 | struct regulator_bulk_data *consumers) | |
4988 | { | |
4989 | int i; | |
4990 | ||
4991 | for (i = 0; i < num_consumers; i++) { | |
4992 | regulator_put(consumers[i].consumer); | |
4993 | consumers[i].consumer = NULL; | |
4994 | } | |
4995 | } | |
4996 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4997 | ||
4998 | /** | |
4999 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 5000 | * @rdev: regulator source |
414c70cb | 5001 | * @event: notifier block |
69279fb9 | 5002 | * @data: callback-specific data. |
414c70cb LG |
5003 | * |
5004 | * Called by regulator drivers to notify clients a regulator event has | |
3bca239d | 5005 | * occurred. |
414c70cb LG |
5006 | */ |
5007 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
5008 | unsigned long event, void *data) | |
5009 | { | |
5010 | _notifier_call_chain(rdev, event, data); | |
5011 | return NOTIFY_DONE; | |
5012 | ||
5013 | } | |
5014 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
5015 | ||
be721979 MB |
5016 | /** |
5017 | * regulator_mode_to_status - convert a regulator mode into a status | |
5018 | * | |
5019 | * @mode: Mode to convert | |
5020 | * | |
5021 | * Convert a regulator mode into a status. | |
5022 | */ | |
5023 | int regulator_mode_to_status(unsigned int mode) | |
5024 | { | |
5025 | switch (mode) { | |
5026 | case REGULATOR_MODE_FAST: | |
5027 | return REGULATOR_STATUS_FAST; | |
5028 | case REGULATOR_MODE_NORMAL: | |
5029 | return REGULATOR_STATUS_NORMAL; | |
5030 | case REGULATOR_MODE_IDLE: | |
5031 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 5032 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
5033 | return REGULATOR_STATUS_STANDBY; |
5034 | default: | |
1beaf762 | 5035 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
5036 | } |
5037 | } | |
5038 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
5039 | ||
39f802d6 TI |
5040 | static struct attribute *regulator_dev_attrs[] = { |
5041 | &dev_attr_name.attr, | |
5042 | &dev_attr_num_users.attr, | |
5043 | &dev_attr_type.attr, | |
5044 | &dev_attr_microvolts.attr, | |
5045 | &dev_attr_microamps.attr, | |
5046 | &dev_attr_opmode.attr, | |
5047 | &dev_attr_state.attr, | |
5048 | &dev_attr_status.attr, | |
5049 | &dev_attr_bypass.attr, | |
5050 | &dev_attr_requested_microamps.attr, | |
5051 | &dev_attr_min_microvolts.attr, | |
5052 | &dev_attr_max_microvolts.attr, | |
5053 | &dev_attr_min_microamps.attr, | |
5054 | &dev_attr_max_microamps.attr, | |
0f2d636e ZW |
5055 | &dev_attr_under_voltage.attr, |
5056 | &dev_attr_over_current.attr, | |
5057 | &dev_attr_regulation_out.attr, | |
5058 | &dev_attr_fail.attr, | |
5059 | &dev_attr_over_temp.attr, | |
5060 | &dev_attr_under_voltage_warn.attr, | |
5061 | &dev_attr_over_current_warn.attr, | |
5062 | &dev_attr_over_voltage_warn.attr, | |
5063 | &dev_attr_over_temp_warn.attr, | |
39f802d6 TI |
5064 | &dev_attr_suspend_standby_state.attr, |
5065 | &dev_attr_suspend_mem_state.attr, | |
5066 | &dev_attr_suspend_disk_state.attr, | |
5067 | &dev_attr_suspend_standby_microvolts.attr, | |
5068 | &dev_attr_suspend_mem_microvolts.attr, | |
5069 | &dev_attr_suspend_disk_microvolts.attr, | |
5070 | &dev_attr_suspend_standby_mode.attr, | |
5071 | &dev_attr_suspend_mem_mode.attr, | |
5072 | &dev_attr_suspend_disk_mode.attr, | |
5073 | NULL | |
5074 | }; | |
5075 | ||
7ad68e2f DB |
5076 | /* |
5077 | * To avoid cluttering sysfs (and memory) with useless state, only | |
5078 | * create attributes that can be meaningfully displayed. | |
5079 | */ | |
39f802d6 TI |
5080 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
5081 | struct attribute *attr, int idx) | |
7ad68e2f | 5082 | { |
39f802d6 | 5083 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 5084 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 5085 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
5086 | umode_t mode = attr->mode; |
5087 | ||
5088 | /* these three are always present */ | |
5089 | if (attr == &dev_attr_name.attr || | |
5090 | attr == &dev_attr_num_users.attr || | |
5091 | attr == &dev_attr_type.attr) | |
5092 | return mode; | |
7ad68e2f DB |
5093 | |
5094 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
5095 | if (attr == &dev_attr_microvolts.attr) { |
5096 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
5097 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
5098 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
5099 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
5100 | return mode; | |
5101 | return 0; | |
f59c8f9f | 5102 | } |
7ad68e2f | 5103 | |
39f802d6 TI |
5104 | if (attr == &dev_attr_microamps.attr) |
5105 | return ops->get_current_limit ? mode : 0; | |
5106 | ||
5107 | if (attr == &dev_attr_opmode.attr) | |
5108 | return ops->get_mode ? mode : 0; | |
5109 | ||
5110 | if (attr == &dev_attr_state.attr) | |
5111 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
5112 | ||
5113 | if (attr == &dev_attr_status.attr) | |
5114 | return ops->get_status ? mode : 0; | |
5115 | ||
5116 | if (attr == &dev_attr_bypass.attr) | |
5117 | return ops->get_bypass ? mode : 0; | |
5118 | ||
0f2d636e ZW |
5119 | if (attr == &dev_attr_under_voltage.attr || |
5120 | attr == &dev_attr_over_current.attr || | |
5121 | attr == &dev_attr_regulation_out.attr || | |
5122 | attr == &dev_attr_fail.attr || | |
5123 | attr == &dev_attr_over_temp.attr || | |
5124 | attr == &dev_attr_under_voltage_warn.attr || | |
5125 | attr == &dev_attr_over_current_warn.attr || | |
5126 | attr == &dev_attr_over_voltage_warn.attr || | |
5127 | attr == &dev_attr_over_temp_warn.attr) | |
5128 | return ops->get_error_flags ? mode : 0; | |
5129 | ||
7ad68e2f | 5130 | /* constraints need specific supporting methods */ |
39f802d6 TI |
5131 | if (attr == &dev_attr_min_microvolts.attr || |
5132 | attr == &dev_attr_max_microvolts.attr) | |
5133 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
5134 | ||
5135 | if (attr == &dev_attr_min_microamps.attr || | |
5136 | attr == &dev_attr_max_microamps.attr) | |
5137 | return ops->set_current_limit ? mode : 0; | |
5138 | ||
5139 | if (attr == &dev_attr_suspend_standby_state.attr || | |
5140 | attr == &dev_attr_suspend_mem_state.attr || | |
5141 | attr == &dev_attr_suspend_disk_state.attr) | |
5142 | return mode; | |
5143 | ||
5144 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
5145 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
5146 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
5147 | return ops->set_suspend_voltage ? mode : 0; | |
5148 | ||
5149 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
5150 | attr == &dev_attr_suspend_mem_mode.attr || | |
5151 | attr == &dev_attr_suspend_disk_mode.attr) | |
5152 | return ops->set_suspend_mode ? mode : 0; | |
5153 | ||
5154 | return mode; | |
5155 | } | |
5156 | ||
5157 | static const struct attribute_group regulator_dev_group = { | |
5158 | .attrs = regulator_dev_attrs, | |
5159 | .is_visible = regulator_attr_is_visible, | |
5160 | }; | |
5161 | ||
5162 | static const struct attribute_group *regulator_dev_groups[] = { | |
5163 | ®ulator_dev_group, | |
5164 | NULL | |
5165 | }; | |
7ad68e2f | 5166 | |
39f802d6 TI |
5167 | static void regulator_dev_release(struct device *dev) |
5168 | { | |
5169 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 | 5170 | |
1f386d68 | 5171 | debugfs_remove_recursive(rdev->debugfs); |
29f5f486 MB |
5172 | kfree(rdev->constraints); |
5173 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 5174 | kfree(rdev); |
7ad68e2f DB |
5175 | } |
5176 | ||
1130e5b3 MB |
5177 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
5178 | { | |
a9eaa813 GR |
5179 | struct device *parent = rdev->dev.parent; |
5180 | const char *rname = rdev_get_name(rdev); | |
5181 | char name[NAME_MAX]; | |
5182 | ||
5183 | /* Avoid duplicate debugfs directory names */ | |
5184 | if (parent && rname == rdev->desc->name) { | |
5185 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
5186 | rname); | |
5187 | rname = name; | |
5188 | } | |
5189 | ||
5190 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 5191 | if (!rdev->debugfs) { |
1130e5b3 | 5192 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
5193 | return; |
5194 | } | |
5195 | ||
5196 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
5197 | &rdev->use_count); | |
5198 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
5199 | &rdev->open_count); | |
f59c8f9f MB |
5200 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
5201 | &rdev->bypass_count); | |
1130e5b3 MB |
5202 | } |
5203 | ||
5e3ca2b3 JMC |
5204 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
5205 | { | |
7ddede6a JH |
5206 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5207 | ||
5208 | if (regulator_resolve_supply(rdev)) | |
5209 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
5210 | ||
5211 | return 0; | |
5e3ca2b3 JMC |
5212 | } |
5213 | ||
d8ca7d18 DO |
5214 | int regulator_coupler_register(struct regulator_coupler *coupler) |
5215 | { | |
5216 | mutex_lock(®ulator_list_mutex); | |
5217 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
5218 | mutex_unlock(®ulator_list_mutex); | |
5219 | ||
5220 | return 0; | |
5221 | } | |
5222 | ||
5223 | static struct regulator_coupler * | |
5224 | regulator_find_coupler(struct regulator_dev *rdev) | |
5225 | { | |
5226 | struct regulator_coupler *coupler; | |
5227 | int err; | |
5228 | ||
5229 | /* | |
5230 | * Note that regulators are appended to the list and the generic | |
5231 | * coupler is registered first, hence it will be attached at last | |
5232 | * if nobody cared. | |
5233 | */ | |
5234 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
5235 | err = coupler->attach_regulator(coupler, rdev); | |
5236 | if (!err) { | |
5237 | if (!coupler->balance_voltage && | |
5238 | rdev->coupling_desc.n_coupled > 2) | |
5239 | goto err_unsupported; | |
5240 | ||
5241 | return coupler; | |
5242 | } | |
5243 | ||
5244 | if (err < 0) | |
5245 | return ERR_PTR(err); | |
5246 | ||
5247 | if (err == 1) | |
5248 | continue; | |
5249 | ||
5250 | break; | |
5251 | } | |
5252 | ||
5253 | return ERR_PTR(-EINVAL); | |
5254 | ||
5255 | err_unsupported: | |
5256 | if (coupler->detach_regulator) | |
5257 | coupler->detach_regulator(coupler, rdev); | |
5258 | ||
5259 | rdev_err(rdev, | |
5260 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
5261 | ||
5262 | return ERR_PTR(-EPERM); | |
5263 | } | |
5264 | ||
f9503385 | 5265 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 5266 | { |
d8ca7d18 | 5267 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
5268 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
5269 | int n_coupled = c_desc->n_coupled; | |
5270 | struct regulator_dev *c_rdev; | |
5271 | int i; | |
5272 | ||
5273 | for (i = 1; i < n_coupled; i++) { | |
5274 | /* already resolved */ | |
5275 | if (c_desc->coupled_rdevs[i]) | |
5276 | continue; | |
5277 | ||
5278 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
5279 | ||
f9503385 DO |
5280 | if (!c_rdev) |
5281 | continue; | |
d3d64537 | 5282 | |
d8ca7d18 DO |
5283 | if (c_rdev->coupling_desc.coupler != coupler) { |
5284 | rdev_err(rdev, "coupler mismatch with %s\n", | |
5285 | rdev_get_name(c_rdev)); | |
5286 | return; | |
5287 | } | |
5288 | ||
f9503385 DO |
5289 | c_desc->coupled_rdevs[i] = c_rdev; |
5290 | c_desc->n_resolved++; | |
d3d64537 | 5291 | |
f9503385 DO |
5292 | regulator_resolve_coupling(c_rdev); |
5293 | } | |
d3d64537 MP |
5294 | } |
5295 | ||
6303f3e7 | 5296 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 5297 | { |
d8ca7d18 | 5298 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
5299 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
5300 | struct regulator_dev *__c_rdev, *c_rdev; | |
5301 | unsigned int __n_coupled, n_coupled; | |
5302 | int i, k; | |
d8ca7d18 | 5303 | int err; |
d3d64537 | 5304 | |
6303f3e7 | 5305 | n_coupled = c_desc->n_coupled; |
d3d64537 | 5306 | |
6303f3e7 DO |
5307 | for (i = 1; i < n_coupled; i++) { |
5308 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 5309 | |
6303f3e7 DO |
5310 | if (!c_rdev) |
5311 | continue; | |
5312 | ||
5313 | regulator_lock(c_rdev); | |
5314 | ||
5315 | __c_desc = &c_rdev->coupling_desc; | |
5316 | __n_coupled = __c_desc->n_coupled; | |
5317 | ||
5318 | for (k = 1; k < __n_coupled; k++) { | |
5319 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
5320 | ||
5321 | if (__c_rdev == rdev) { | |
5322 | __c_desc->coupled_rdevs[k] = NULL; | |
5323 | __c_desc->n_resolved--; | |
5324 | break; | |
5325 | } | |
5326 | } | |
5327 | ||
5328 | regulator_unlock(c_rdev); | |
5329 | ||
5330 | c_desc->coupled_rdevs[i] = NULL; | |
5331 | c_desc->n_resolved--; | |
5332 | } | |
d8ca7d18 DO |
5333 | |
5334 | if (coupler && coupler->detach_regulator) { | |
5335 | err = coupler->detach_regulator(coupler, rdev); | |
5336 | if (err) | |
61aab5ad MM |
5337 | rdev_err(rdev, "failed to detach from coupler: %pe\n", |
5338 | ERR_PTR(err)); | |
d8ca7d18 DO |
5339 | } |
5340 | ||
5341 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5342 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5343 | } |
5344 | ||
f9503385 | 5345 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5346 | { |
7d819664 | 5347 | struct regulator_dev **coupled; |
d8ca7d18 | 5348 | int err, n_phandles; |
d3d64537 MP |
5349 | |
5350 | if (!IS_ENABLED(CONFIG_OF)) | |
5351 | n_phandles = 0; | |
5352 | else | |
5353 | n_phandles = of_get_n_coupled(rdev); | |
5354 | ||
7d819664 MM |
5355 | coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL); |
5356 | if (!coupled) | |
d8ca7d18 | 5357 | return -ENOMEM; |
d3d64537 | 5358 | |
7d819664 MM |
5359 | rdev->coupling_desc.coupled_rdevs = coupled; |
5360 | ||
d3d64537 MP |
5361 | /* |
5362 | * Every regulator should always have coupling descriptor filled with | |
5363 | * at least pointer to itself. | |
5364 | */ | |
5365 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5366 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5367 | rdev->coupling_desc.n_resolved++; | |
5368 | ||
5369 | /* regulator isn't coupled */ | |
5370 | if (n_phandles == 0) | |
5371 | return 0; | |
5372 | ||
d8ca7d18 | 5373 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5374 | return -EPERM; |
d3d64537 | 5375 | |
73a32129 | 5376 | mutex_lock(®ulator_list_mutex); |
d8ca7d18 | 5377 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
73a32129 MM |
5378 | mutex_unlock(®ulator_list_mutex); |
5379 | ||
d8ca7d18 DO |
5380 | if (IS_ERR(rdev->coupling_desc.coupler)) { |
5381 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
61aab5ad | 5382 | rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err)); |
d8ca7d18 | 5383 | return err; |
d3d64537 MP |
5384 | } |
5385 | ||
d8ca7d18 DO |
5386 | return 0; |
5387 | } | |
5388 | ||
5389 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5390 | struct regulator_dev *rdev) | |
5391 | { | |
5392 | if (rdev->coupling_desc.n_coupled > 2) { | |
5393 | rdev_err(rdev, | |
5394 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5395 | return -EPERM; |
d8ca7d18 | 5396 | } |
d3d64537 | 5397 | |
e381bfe4 DO |
5398 | if (!rdev->constraints->always_on) { |
5399 | rdev_err(rdev, | |
5400 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5401 | return -ENOTSUPP; | |
5402 | } | |
5403 | ||
d3d64537 MP |
5404 | return 0; |
5405 | } | |
5406 | ||
d8ca7d18 DO |
5407 | static struct regulator_coupler generic_regulator_coupler = { |
5408 | .attach_regulator = generic_coupler_attach, | |
5409 | }; | |
5410 | ||
414c70cb LG |
5411 | /** |
5412 | * regulator_register - register regulator | |
8f3cbcd6 | 5413 | * @dev: the device that drive the regulator |
69279fb9 | 5414 | * @regulator_desc: regulator to register |
f47531b1 | 5415 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5416 | * |
5417 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5418 | * Returns a valid pointer to struct regulator_dev on success |
5419 | * or an ERR_PTR() on error. | |
414c70cb | 5420 | */ |
65f26846 | 5421 | struct regulator_dev * |
8f3cbcd6 CH |
5422 | regulator_register(struct device *dev, |
5423 | const struct regulator_desc *regulator_desc, | |
1b3de223 | 5424 | const struct regulator_config *cfg) |
414c70cb | 5425 | { |
c172708d | 5426 | const struct regulator_init_data *init_data; |
1b3de223 | 5427 | struct regulator_config *config = NULL; |
72dca06f | 5428 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5429 | struct regulator_dev *rdev; |
0edb040d LW |
5430 | bool dangling_cfg_gpiod = false; |
5431 | bool dangling_of_gpiod = false; | |
a5766f11 | 5432 | int ret, i; |
520fb178 | 5433 | bool resolved_early = false; |
414c70cb | 5434 | |
0edb040d | 5435 | if (cfg == NULL) |
414c70cb | 5436 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5437 | if (cfg->ena_gpiod) |
5438 | dangling_cfg_gpiod = true; | |
5439 | if (regulator_desc == NULL) { | |
5440 | ret = -EINVAL; | |
5441 | goto rinse; | |
5442 | } | |
414c70cb | 5443 | |
8f3cbcd6 | 5444 | WARN_ON(!dev || !cfg->dev); |
32c8fad4 | 5445 | |
0edb040d LW |
5446 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5447 | ret = -EINVAL; | |
5448 | goto rinse; | |
5449 | } | |
414c70cb | 5450 | |
cd78dfc6 | 5451 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5452 | regulator_desc->type != REGULATOR_CURRENT) { |
5453 | ret = -EINVAL; | |
5454 | goto rinse; | |
5455 | } | |
414c70cb | 5456 | |
476c2d83 MB |
5457 | /* Only one of each should be implemented */ |
5458 | WARN_ON(regulator_desc->ops->get_voltage && | |
5459 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5460 | WARN_ON(regulator_desc->ops->set_voltage && |
5461 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5462 | |
5463 | /* If we're using selectors we must implement list_voltage. */ | |
5464 | if (regulator_desc->ops->get_voltage_sel && | |
5465 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5466 | ret = -EINVAL; |
5467 | goto rinse; | |
476c2d83 | 5468 | } |
e8eef82b MB |
5469 | if (regulator_desc->ops->set_voltage_sel && |
5470 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5471 | ret = -EINVAL; |
5472 | goto rinse; | |
e8eef82b | 5473 | } |
476c2d83 | 5474 | |
414c70cb | 5475 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5476 | if (rdev == NULL) { |
5477 | ret = -ENOMEM; | |
5478 | goto rinse; | |
5479 | } | |
d3c73156 | 5480 | device_initialize(&rdev->dev); |
7111c6d1 | 5481 | spin_lock_init(&rdev->err_lock); |
414c70cb | 5482 | |
1b3de223 KK |
5483 | /* |
5484 | * Duplicate the config so the driver could override it after | |
5485 | * parsing init data. | |
5486 | */ | |
5487 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5488 | if (config == NULL) { | |
0edb040d | 5489 | ret = -ENOMEM; |
d3c73156 | 5490 | goto clean; |
1b3de223 KK |
5491 | } |
5492 | ||
bfa21a0d | 5493 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5494 | &rdev->dev.of_node); |
f8970d34 MF |
5495 | |
5496 | /* | |
5497 | * Sometimes not all resources are probed already so we need to take | |
5498 | * that into account. This happens most the time if the ena_gpiod comes | |
5499 | * from a gpio extender or something else. | |
5500 | */ | |
5501 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
f8970d34 | 5502 | ret = -EPROBE_DEFER; |
d3c73156 | 5503 | goto clean; |
f8970d34 MF |
5504 | } |
5505 | ||
0edb040d LW |
5506 | /* |
5507 | * We need to keep track of any GPIO descriptor coming from the | |
5508 | * device tree until we have handled it over to the core. If the | |
5509 | * config that was passed in to this function DOES NOT contain | |
5510 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5511 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5512 | * tree. |
5513 | */ | |
5514 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5515 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5516 | if (!init_data) { |
5517 | init_data = config->init_data; | |
5518 | rdev->dev.of_node = of_node_get(config->of_node); | |
5519 | } | |
5520 | ||
f8702f9e | 5521 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5522 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5523 | rdev->owner = regulator_desc->owner; |
5524 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5525 | if (config->regmap) |
5526 | rdev->regmap = config->regmap; | |
52b84dac | 5527 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5528 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5529 | else if (dev->parent) |
5530 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5531 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5532 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5533 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5534 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5535 | |
520fb178 CK |
5536 | if (init_data && init_data->supply_regulator) |
5537 | rdev->supply_name = init_data->supply_regulator; | |
5538 | else if (regulator_desc->supply_name) | |
5539 | rdev->supply_name = regulator_desc->supply_name; | |
daad134d | 5540 | |
a5766f11 | 5541 | /* register with sysfs */ |
414c70cb | 5542 | rdev->dev.class = ®ulator_class; |
0debed5b | 5543 | rdev->dev.parent = config->dev; |
72dca06f | 5544 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5545 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5546 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5547 | |
74f544c1 | 5548 | /* set regulator constraints */ |
9a8f5e07 | 5549 | if (init_data) |
57a6ad48 MM |
5550 | rdev->constraints = kmemdup(&init_data->constraints, |
5551 | sizeof(*rdev->constraints), | |
5552 | GFP_KERNEL); | |
5553 | else | |
5554 | rdev->constraints = kzalloc(sizeof(*rdev->constraints), | |
5555 | GFP_KERNEL); | |
5556 | if (!rdev->constraints) { | |
5557 | ret = -ENOMEM; | |
5558 | goto wash; | |
5559 | } | |
9a8f5e07 | 5560 | |
8a866d52 | 5561 | if ((rdev->supply_name && !rdev->supply) && |
520fb178 CK |
5562 | (rdev->constraints->always_on || |
5563 | rdev->constraints->boot_on)) { | |
8a866d52 CK |
5564 | ret = regulator_resolve_supply(rdev); |
5565 | if (ret) | |
5566 | rdev_dbg(rdev, "unable to resolve supply early: %pe\n", | |
5567 | ERR_PTR(ret)); | |
520fb178 CK |
5568 | |
5569 | resolved_early = true; | |
8a866d52 CK |
5570 | } |
5571 | ||
5572 | /* perform any regulator specific init */ | |
9a8f5e07 | 5573 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5574 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 | 5575 | if (ret < 0) |
520fb178 | 5576 | goto wash; |
a5766f11 LG |
5577 | } |
5578 | ||
541d052d | 5579 | if (config->ena_gpiod) { |
daad134d KA |
5580 | ret = regulator_ena_gpio_request(rdev, config); |
5581 | if (ret != 0) { | |
61aab5ad MM |
5582 | rdev_err(rdev, "Failed to request enable GPIO: %pe\n", |
5583 | ERR_PTR(ret)); | |
520fb178 | 5584 | goto wash; |
daad134d | 5585 | } |
0edb040d LW |
5586 | /* The regulator core took over the GPIO descriptor */ |
5587 | dangling_cfg_gpiod = false; | |
5588 | dangling_of_gpiod = false; | |
daad134d | 5589 | } |
0178f3e2 | 5590 | |
57a6ad48 | 5591 | ret = set_machine_constraints(rdev); |
520fb178 | 5592 | if (ret == -EPROBE_DEFER && !resolved_early) { |
aea6cb99 | 5593 | /* Regulator might be in bypass mode and so needs its supply |
69b8821e SK |
5594 | * to set the constraints |
5595 | */ | |
aea6cb99 MM |
5596 | /* FIXME: this currently triggers a chicken-and-egg problem |
5597 | * when creating -SUPPLY symlink in sysfs to a regulator | |
69b8821e SK |
5598 | * that is just being created |
5599 | */ | |
0917c9db MM |
5600 | rdev_dbg(rdev, "will resolve supply early: %s\n", |
5601 | rdev->supply_name); | |
aea6cb99 MM |
5602 | ret = regulator_resolve_supply(rdev); |
5603 | if (!ret) | |
57a6ad48 | 5604 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5605 | else |
5606 | rdev_dbg(rdev, "unable to resolve supply early: %pe\n", | |
5607 | ERR_PTR(ret)); | |
5608 | } | |
45389c47 JH |
5609 | if (ret < 0) |
5610 | goto wash; | |
5611 | ||
f9503385 DO |
5612 | ret = regulator_init_coupling(rdev); |
5613 | if (ret < 0) | |
d3d64537 MP |
5614 | goto wash; |
5615 | ||
a5766f11 | 5616 | /* add consumers devices */ |
9a8f5e07 MB |
5617 | if (init_data) { |
5618 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
5619 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5620 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5621 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
5622 | if (ret < 0) { |
5623 | dev_err(dev, "Failed to set supply %s\n", | |
5624 | init_data->consumer_supplies[i].supply); | |
5625 | goto unset_supplies; | |
5626 | } | |
23c2f041 | 5627 | } |
414c70cb | 5628 | } |
a5766f11 | 5629 | |
fd086045 MK |
5630 | if (!rdev->desc->ops->get_voltage && |
5631 | !rdev->desc->ops->list_voltage && | |
5632 | !rdev->desc->fixed_uV) | |
5633 | rdev->is_switch = true; | |
5634 | ||
9177514c VZ |
5635 | ret = device_add(&rdev->dev); |
5636 | if (ret != 0) | |
c438b9d0 | 5637 | goto unset_supplies; |
c438b9d0 | 5638 | |
1130e5b3 | 5639 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5640 | |
f9503385 DO |
5641 | /* try to resolve regulators coupling since a new one was registered */ |
5642 | mutex_lock(®ulator_list_mutex); | |
5643 | regulator_resolve_coupling(rdev); | |
5644 | mutex_unlock(®ulator_list_mutex); | |
5645 | ||
5e3ca2b3 JMC |
5646 | /* try to resolve regulators supply since a new one was registered */ |
5647 | class_for_each_device(®ulator_class, NULL, NULL, | |
5648 | regulator_register_resolve_supply); | |
1b3de223 | 5649 | kfree(config); |
414c70cb | 5650 | return rdev; |
4fca9545 | 5651 | |
d4033b54 | 5652 | unset_supplies: |
45389c47 | 5653 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5654 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5655 | regulator_remove_coupling(rdev); |
45389c47 | 5656 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5657 | wash: |
ba62319a | 5658 | regulator_put(rdev->supply); |
26c2c997 | 5659 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5660 | mutex_lock(®ulator_list_mutex); |
32165230 | 5661 | regulator_ena_gpio_free(rdev); |
45389c47 | 5662 | mutex_unlock(®ulator_list_mutex); |
5f4b204b ZH |
5663 | put_device(&rdev->dev); |
5664 | rdev = NULL; | |
4fca9545 | 5665 | clean: |
0edb040d LW |
5666 | if (dangling_of_gpiod) |
5667 | gpiod_put(config->ena_gpiod); | |
5f4b204b ZH |
5668 | if (rdev && rdev->dev.of_node) |
5669 | of_node_put(rdev->dev.of_node); | |
5670 | kfree(rdev); | |
a2151374 | 5671 | kfree(config); |
0edb040d LW |
5672 | rinse: |
5673 | if (dangling_cfg_gpiod) | |
5674 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5675 | return ERR_PTR(ret); |
414c70cb LG |
5676 | } |
5677 | EXPORT_SYMBOL_GPL(regulator_register); | |
5678 | ||
5679 | /** | |
5680 | * regulator_unregister - unregister regulator | |
69279fb9 | 5681 | * @rdev: regulator to unregister |
414c70cb LG |
5682 | * |
5683 | * Called by regulator drivers to unregister a regulator. | |
5684 | */ | |
5685 | void regulator_unregister(struct regulator_dev *rdev) | |
5686 | { | |
5687 | if (rdev == NULL) | |
5688 | return; | |
5689 | ||
891636ea MB |
5690 | if (rdev->supply) { |
5691 | while (rdev->use_count--) | |
5692 | regulator_disable(rdev->supply); | |
e032b376 | 5693 | regulator_put(rdev->supply); |
891636ea | 5694 | } |
ff9b34b6 | 5695 | |
06377301 CK |
5696 | flush_work(&rdev->disable_work.work); |
5697 | ||
414c70cb | 5698 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5699 | |
6bf87d17 | 5700 | WARN_ON(rdev->open_count); |
6303f3e7 | 5701 | regulator_remove_coupling(rdev); |
0f1d747b | 5702 | unset_regulator_supplies(rdev); |
414c70cb | 5703 | list_del(&rdev->list); |
f19b00da | 5704 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5705 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5706 | |
5707 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5708 | } |
5709 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5710 | ||
f7efad10 | 5711 | #ifdef CONFIG_SUSPEND |
414c70cb | 5712 | /** |
0380cf7d | 5713 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5714 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5715 | * |
5716 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5717 | */ |
0380cf7d | 5718 | static int regulator_suspend(struct device *dev) |
414c70cb | 5719 | { |
cd7e36ab | 5720 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5721 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab | 5722 | int ret; |
0955f5be SB |
5723 | const struct regulator_state *rstate; |
5724 | ||
5725 | rstate = regulator_get_suspend_state_check(rdev, state); | |
5726 | if (!rstate) | |
5727 | return 0; | |
cd7e36ab MS |
5728 | |
5729 | regulator_lock(rdev); | |
0955f5be | 5730 | ret = __suspend_set_state(rdev, rstate); |
cd7e36ab | 5731 | regulator_unlock(rdev); |
414c70cb | 5732 | |
cd7e36ab | 5733 | return ret; |
85f3b431 | 5734 | } |
d3e4eccb | 5735 | |
cd7e36ab | 5736 | static int regulator_resume(struct device *dev) |
85f3b431 | 5737 | { |
cd7e36ab | 5738 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5739 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5740 | struct regulator_state *rstate; |
cd7e36ab | 5741 | int ret = 0; |
f7efad10 | 5742 | |
cd7e36ab | 5743 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5744 | if (rstate == NULL) |
35b5f14e | 5745 | return 0; |
414c70cb | 5746 | |
0955f5be SB |
5747 | /* Avoid grabbing the lock if we don't need to */ |
5748 | if (!rdev->desc->ops->resume) | |
5749 | return 0; | |
5750 | ||
66cf9a7e | 5751 | regulator_lock(rdev); |
85f3b431 | 5752 | |
0955f5be SB |
5753 | if (rstate->enabled == ENABLE_IN_SUSPEND || |
5754 | rstate->enabled == DISABLE_IN_SUSPEND) | |
0380cf7d | 5755 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5756 | |
66cf9a7e | 5757 | regulator_unlock(rdev); |
85f3b431 | 5758 | |
f7efad10 | 5759 | return ret; |
414c70cb | 5760 | } |
f7efad10 CZ |
5761 | #else /* !CONFIG_SUSPEND */ |
5762 | ||
0380cf7d | 5763 | #define regulator_suspend NULL |
5764 | #define regulator_resume NULL | |
f7efad10 CZ |
5765 | |
5766 | #endif /* !CONFIG_SUSPEND */ | |
5767 | ||
5768 | #ifdef CONFIG_PM | |
5769 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5770 | .suspend = regulator_suspend, |
5771 | .resume = regulator_resume, | |
f7efad10 CZ |
5772 | }; |
5773 | #endif | |
5774 | ||
285c22de | 5775 | struct class regulator_class = { |
f7efad10 CZ |
5776 | .name = "regulator", |
5777 | .dev_release = regulator_dev_release, | |
5778 | .dev_groups = regulator_dev_groups, | |
5779 | #ifdef CONFIG_PM | |
5780 | .pm = ®ulator_pm_ops, | |
5781 | #endif | |
5782 | }; | |
ca725561 MB |
5783 | /** |
5784 | * regulator_has_full_constraints - the system has fully specified constraints | |
5785 | * | |
5786 | * Calling this function will cause the regulator API to disable all | |
5787 | * regulators which have a zero use count and don't have an always_on | |
5788 | * constraint in a late_initcall. | |
5789 | * | |
5790 | * The intention is that this will become the default behaviour in a | |
5791 | * future kernel release so users are encouraged to use this facility | |
5792 | * now. | |
5793 | */ | |
5794 | void regulator_has_full_constraints(void) | |
5795 | { | |
5796 | has_full_constraints = 1; | |
5797 | } | |
5798 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5799 | ||
414c70cb LG |
5800 | /** |
5801 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5802 | * @rdev: regulator |
414c70cb LG |
5803 | * |
5804 | * Get rdev regulator driver private data. This call can be used in the | |
5805 | * regulator driver context. | |
5806 | */ | |
5807 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5808 | { | |
5809 | return rdev->reg_data; | |
5810 | } | |
5811 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5812 | ||
5813 | /** | |
5814 | * regulator_get_drvdata - get regulator driver data | |
5815 | * @regulator: regulator | |
5816 | * | |
5817 | * Get regulator driver private data. This call can be used in the consumer | |
5818 | * driver context when non API regulator specific functions need to be called. | |
5819 | */ | |
5820 | void *regulator_get_drvdata(struct regulator *regulator) | |
5821 | { | |
5822 | return regulator->rdev->reg_data; | |
5823 | } | |
5824 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5825 | ||
5826 | /** | |
5827 | * regulator_set_drvdata - set regulator driver data | |
5828 | * @regulator: regulator | |
5829 | * @data: data | |
5830 | */ | |
5831 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5832 | { | |
5833 | regulator->rdev->reg_data = data; | |
5834 | } | |
5835 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5836 | ||
5837 | /** | |
d73e873b | 5838 | * rdev_get_id - get regulator ID |
69279fb9 | 5839 | * @rdev: regulator |
414c70cb LG |
5840 | */ |
5841 | int rdev_get_id(struct regulator_dev *rdev) | |
5842 | { | |
5843 | return rdev->desc->id; | |
5844 | } | |
5845 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5846 | ||
a5766f11 LG |
5847 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5848 | { | |
5849 | return &rdev->dev; | |
5850 | } | |
5851 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5852 | ||
03c87b95 BG |
5853 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5854 | { | |
5855 | return rdev->regmap; | |
5856 | } | |
5857 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5858 | ||
a5766f11 LG |
5859 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5860 | { | |
5861 | return reg_init_data->driver_data; | |
5862 | } | |
5863 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5864 | ||
ba55a974 | 5865 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5866 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5867 | { |
ba55a974 MB |
5868 | struct regulator_map *map; |
5869 | ||
ba55a974 | 5870 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5871 | seq_printf(sf, "%s -> %s.%s\n", |
5872 | rdev_get_name(map->regulator), map->dev_name, | |
5873 | map->supply); | |
ba55a974 MB |
5874 | } |
5875 | ||
dbc55955 HZ |
5876 | return 0; |
5877 | } | |
3e60b4fc | 5878 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5879 | |
85f3b431 TV |
5880 | struct summary_data { |
5881 | struct seq_file *s; | |
5882 | struct regulator_dev *parent; | |
5883 | int level; | |
5884 | }; | |
5885 | ||
5886 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5887 | struct regulator_dev *rdev, | |
5888 | int level); | |
5889 | ||
5890 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5891 | { | |
5892 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5893 | struct summary_data *summary_data = data; | |
5894 | ||
5895 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5896 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5897 | summary_data->level + 1); | |
5898 | ||
5899 | return 0; | |
5900 | } | |
5901 | ||
7c225ec9 HS |
5902 | static void regulator_summary_show_subtree(struct seq_file *s, |
5903 | struct regulator_dev *rdev, | |
5904 | int level) | |
5905 | { | |
7c225ec9 HS |
5906 | struct regulation_constraints *c; |
5907 | struct regulator *consumer; | |
85f3b431 | 5908 | struct summary_data summary_data; |
7e4d9683 | 5909 | unsigned int opmode; |
7c225ec9 HS |
5910 | |
5911 | if (!rdev) | |
5912 | return; | |
5913 | ||
7e4d9683 | 5914 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5915 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5916 | level * 3 + 1, "", |
5917 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5918 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5919 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5920 | |
d22b85a1 | 5921 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5922 | seq_printf(s, "%5dmA ", |
5923 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5924 | |
5925 | c = rdev->constraints; | |
5926 | if (c) { | |
5927 | switch (rdev->desc->type) { | |
5928 | case REGULATOR_VOLTAGE: | |
5929 | seq_printf(s, "%5dmV %5dmV ", | |
5930 | c->min_uV / 1000, c->max_uV / 1000); | |
5931 | break; | |
5932 | case REGULATOR_CURRENT: | |
5933 | seq_printf(s, "%5dmA %5dmA ", | |
5934 | c->min_uA / 1000, c->max_uA / 1000); | |
5935 | break; | |
5936 | } | |
5937 | } | |
5938 | ||
5939 | seq_puts(s, "\n"); | |
5940 | ||
5941 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5942 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5943 | continue; |
5944 | ||
5945 | seq_printf(s, "%*s%-*s ", | |
5946 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5947 | 30 - (level + 1) * 3, |
6b576eb0 | 5948 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5949 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5950 | |
5951 | switch (rdev->desc->type) { | |
5952 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5953 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5954 | consumer->enable_count, | |
7d3827b5 | 5955 | consumer->uA_load / 1000, |
5451781d DA |
5956 | consumer->uA_load && !consumer->enable_count ? |
5957 | '*' : ' ', | |
c360a6df CZ |
5958 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5959 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5960 | break; |
5961 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5962 | break; |
5963 | } | |
5964 | ||
5965 | seq_puts(s, "\n"); | |
5966 | } | |
5967 | ||
85f3b431 TV |
5968 | summary_data.s = s; |
5969 | summary_data.level = level; | |
5970 | summary_data.parent = rdev; | |
7c225ec9 | 5971 | |
85f3b431 TV |
5972 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5973 | regulator_summary_show_children); | |
f8702f9e DO |
5974 | } |
5975 | ||
5976 | struct summary_lock_data { | |
5977 | struct ww_acquire_ctx *ww_ctx; | |
5978 | struct regulator_dev **new_contended_rdev; | |
5979 | struct regulator_dev **old_contended_rdev; | |
5980 | }; | |
5981 | ||
5982 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5983 | { | |
5984 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5985 | struct summary_lock_data *lock_data = data; | |
5986 | int ret = 0; | |
5987 | ||
5988 | if (rdev != *lock_data->old_contended_rdev) { | |
5989 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5990 | ||
5991 | if (ret == -EDEADLK) | |
5992 | *lock_data->new_contended_rdev = rdev; | |
5993 | else | |
5994 | WARN_ON_ONCE(ret); | |
5995 | } else { | |
5996 | *lock_data->old_contended_rdev = NULL; | |
5997 | } | |
5998 | ||
5999 | return ret; | |
6000 | } | |
6001 | ||
6002 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
6003 | { | |
6004 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
6005 | struct summary_lock_data *lock_data = data; | |
6006 | ||
6007 | if (lock_data) { | |
6008 | if (rdev == *lock_data->new_contended_rdev) | |
6009 | return -EDEADLK; | |
6010 | } | |
7e4d9683 DA |
6011 | |
6012 | regulator_unlock(rdev); | |
f8702f9e DO |
6013 | |
6014 | return 0; | |
6015 | } | |
6016 | ||
6017 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
6018 | struct regulator_dev **new_contended_rdev, | |
6019 | struct regulator_dev **old_contended_rdev) | |
6020 | { | |
6021 | struct summary_lock_data lock_data; | |
6022 | int ret; | |
6023 | ||
6024 | lock_data.ww_ctx = ww_ctx; | |
6025 | lock_data.new_contended_rdev = new_contended_rdev; | |
6026 | lock_data.old_contended_rdev = old_contended_rdev; | |
6027 | ||
6028 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
6029 | regulator_summary_lock_one); | |
6030 | if (ret) | |
6031 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
6032 | regulator_summary_unlock_one); | |
6033 | ||
6034 | return ret; | |
6035 | } | |
6036 | ||
6037 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
6038 | { | |
6039 | struct regulator_dev *new_contended_rdev = NULL; | |
6040 | struct regulator_dev *old_contended_rdev = NULL; | |
6041 | int err; | |
6042 | ||
ff9b34b6 DO |
6043 | mutex_lock(®ulator_list_mutex); |
6044 | ||
f8702f9e DO |
6045 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
6046 | ||
6047 | do { | |
6048 | if (new_contended_rdev) { | |
6049 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
6050 | old_contended_rdev = new_contended_rdev; | |
6051 | old_contended_rdev->ref_cnt++; | |
6052 | } | |
6053 | ||
6054 | err = regulator_summary_lock_all(ww_ctx, | |
6055 | &new_contended_rdev, | |
6056 | &old_contended_rdev); | |
6057 | ||
6058 | if (old_contended_rdev) | |
6059 | regulator_unlock(old_contended_rdev); | |
6060 | ||
6061 | } while (err == -EDEADLK); | |
6062 | ||
6063 | ww_acquire_done(ww_ctx); | |
6064 | } | |
6065 | ||
6066 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
6067 | { | |
6068 | class_for_each_device(®ulator_class, NULL, NULL, | |
6069 | regulator_summary_unlock_one); | |
6070 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
6071 | |
6072 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
6073 | } |
6074 | ||
85f3b431 | 6075 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 6076 | { |
85f3b431 TV |
6077 | struct regulator_dev *rdev = dev_to_rdev(dev); |
6078 | struct seq_file *s = data; | |
7c225ec9 | 6079 | |
85f3b431 TV |
6080 | if (!rdev->supply) |
6081 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 6082 | |
85f3b431 TV |
6083 | return 0; |
6084 | } | |
7c225ec9 | 6085 | |
85f3b431 TV |
6086 | static int regulator_summary_show(struct seq_file *s, void *data) |
6087 | { | |
f8702f9e DO |
6088 | struct ww_acquire_ctx ww_ctx; |
6089 | ||
01de19d0 DA |
6090 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
6091 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 6092 | |
f8702f9e DO |
6093 | regulator_summary_lock(&ww_ctx); |
6094 | ||
85f3b431 TV |
6095 | class_for_each_device(®ulator_class, NULL, s, |
6096 | regulator_summary_show_roots); | |
7c225ec9 | 6097 | |
f8702f9e DO |
6098 | regulator_summary_unlock(&ww_ctx); |
6099 | ||
7c225ec9 HS |
6100 | return 0; |
6101 | } | |
3e60b4fc YL |
6102 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
6103 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 6104 | |
414c70cb LG |
6105 | static int __init regulator_init(void) |
6106 | { | |
34abbd68 MB |
6107 | int ret; |
6108 | ||
34abbd68 MB |
6109 | ret = class_register(®ulator_class); |
6110 | ||
1130e5b3 | 6111 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 6112 | if (!debugfs_root) |
1130e5b3 | 6113 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 6114 | |
3e60b4fc | 6115 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
6116 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
6117 | &supply_map_fops); | |
1130e5b3 | 6118 | |
7c225ec9 | 6119 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 6120 | NULL, ®ulator_summary_fops); |
3e60b4fc | 6121 | #endif |
34abbd68 MB |
6122 | regulator_dummy_init(); |
6123 | ||
d8ca7d18 DO |
6124 | regulator_coupler_register(&generic_regulator_coupler); |
6125 | ||
34abbd68 | 6126 | return ret; |
414c70cb LG |
6127 | } |
6128 | ||
6129 | /* init early to allow our consumers to complete system booting */ | |
6130 | core_initcall(regulator_init); | |
ca725561 | 6131 | |
55576cf1 | 6132 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 6133 | { |
609ca5f3 | 6134 | struct regulator_dev *rdev = dev_to_rdev(dev); |
609ca5f3 | 6135 | struct regulation_constraints *c = rdev->constraints; |
4e2a354e | 6136 | int ret; |
ca725561 | 6137 | |
609ca5f3 MB |
6138 | if (c && c->always_on) |
6139 | return 0; | |
6140 | ||
8a34e979 | 6141 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
6142 | return 0; |
6143 | ||
66cf9a7e | 6144 | regulator_lock(rdev); |
609ca5f3 MB |
6145 | |
6146 | if (rdev->use_count) | |
6147 | goto unlock; | |
6148 | ||
4e2a354e OB |
6149 | /* If reading the status failed, assume that it's off. */ |
6150 | if (_regulator_is_enabled(rdev) <= 0) | |
609ca5f3 MB |
6151 | goto unlock; |
6152 | ||
6153 | if (have_full_constraints()) { | |
6154 | /* We log since this may kill the system if it goes | |
69b8821e SK |
6155 | * wrong. |
6156 | */ | |
609ca5f3 MB |
6157 | rdev_info(rdev, "disabling\n"); |
6158 | ret = _regulator_do_disable(rdev); | |
6159 | if (ret != 0) | |
61aab5ad | 6160 | rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret)); |
609ca5f3 MB |
6161 | } else { |
6162 | /* The intention is that in future we will | |
6163 | * assume that full constraints are provided | |
6164 | * so warn even if we aren't going to do | |
6165 | * anything here. | |
6166 | */ | |
6167 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
6168 | } | |
6169 | ||
6170 | unlock: | |
66cf9a7e | 6171 | regulator_unlock(rdev); |
609ca5f3 MB |
6172 | |
6173 | return 0; | |
6174 | } | |
6175 | ||
55576cf1 | 6176 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 6177 | { |
3827b64d JMC |
6178 | /* |
6179 | * Regulators may had failed to resolve their input supplies | |
6180 | * when were registered, either because the input supply was | |
6181 | * not registered yet or because its parent device was not | |
6182 | * bound yet. So attempt to resolve the input supplies for | |
6183 | * pending regulators before trying to disable unused ones. | |
6184 | */ | |
6185 | class_for_each_device(®ulator_class, NULL, NULL, | |
6186 | regulator_register_resolve_supply); | |
6187 | ||
ca725561 | 6188 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
6189 | * we have permission to change the status for and which are |
6190 | * not in use or always_on. This is effectively the default | |
6191 | * for DT and ACPI as they have full constraints. | |
ca725561 | 6192 | */ |
609ca5f3 MB |
6193 | class_for_each_device(®ulator_class, NULL, NULL, |
6194 | regulator_late_cleanup); | |
55576cf1 MB |
6195 | } |
6196 | ||
6197 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
6198 | regulator_init_complete_work_function); | |
6199 | ||
6200 | static int __init regulator_init_complete(void) | |
6201 | { | |
6202 | /* | |
6203 | * Since DT doesn't provide an idiomatic mechanism for | |
6204 | * enabling full constraints and since it's much more natural | |
6205 | * with DT to provide them just assume that a DT enabled | |
6206 | * system has full constraints. | |
6207 | */ | |
6208 | if (of_have_populated_dt()) | |
6209 | has_full_constraints = true; | |
6210 | ||
6211 | /* | |
2a15483b JS |
6212 | * We punt completion for an arbitrary amount of time since |
6213 | * systems like distros will load many drivers from userspace | |
6214 | * so consumers might not always be ready yet, this is | |
6215 | * particularly an issue with laptops where this might bounce | |
6216 | * the display off then on. Ideally we'd get a notification | |
6217 | * from userspace when this happens but we don't so just wait | |
6218 | * a bit and hope we waited long enough. It'd be better if | |
6219 | * we'd only do this on systems that need it, and a kernel | |
6220 | * command line option might be useful. | |
55576cf1 | 6221 | */ |
2a15483b JS |
6222 | schedule_delayed_work(®ulator_init_complete_work, |
6223 | msecs_to_jiffies(30000)); | |
ca725561 MB |
6224 | |
6225 | return 0; | |
6226 | } | |
fd482a3e | 6227 | late_initcall_sync(regulator_init_complete); |