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); |
414c70cb LG |
86 | static int _regulator_get_current_limit(struct regulator_dev *rdev); |
87 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 88 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 89 | unsigned long event, void *data); |
75790251 MB |
90 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
91 | int min_uV, int max_uV); | |
c054c6c7 MP |
92 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
93 | suspend_state_t state); | |
3801b86a MB |
94 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
95 | struct device *dev, | |
96 | const char *supply_name); | |
e1794aa4 | 97 | static void destroy_regulator(struct regulator *regulator); |
36a1f1b6 | 98 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 99 | |
d22b85a1 | 100 | const char *rdev_get_name(struct regulator_dev *rdev) |
1083c393 MB |
101 | { |
102 | if (rdev->constraints && rdev->constraints->name) | |
103 | return rdev->constraints->name; | |
104 | else if (rdev->desc->name) | |
105 | return rdev->desc->name; | |
106 | else | |
107 | return ""; | |
108 | } | |
157d2230 | 109 | EXPORT_SYMBOL_GPL(rdev_get_name); |
1083c393 | 110 | |
87b28417 MB |
111 | static bool have_full_constraints(void) |
112 | { | |
75bc9641 | 113 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
114 | } |
115 | ||
8a34e979 WP |
116 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
117 | { | |
118 | if (!rdev->constraints) { | |
119 | rdev_err(rdev, "no constraints\n"); | |
120 | return false; | |
121 | } | |
122 | ||
123 | if (rdev->constraints->valid_ops_mask & ops) | |
124 | return true; | |
125 | ||
126 | return false; | |
127 | } | |
128 | ||
66cf9a7e MP |
129 | /** |
130 | * regulator_lock_nested - lock a single regulator | |
131 | * @rdev: regulator source | |
f8702f9e | 132 | * @ww_ctx: w/w mutex acquire context |
66cf9a7e MP |
133 | * |
134 | * This function can be called many times by one task on | |
135 | * a single regulator and its mutex will be locked only | |
136 | * once. If a task, which is calling this function is other | |
137 | * than the one, which initially locked the mutex, it will | |
138 | * wait on mutex. | |
139 | */ | |
f8702f9e DO |
140 | static inline int regulator_lock_nested(struct regulator_dev *rdev, |
141 | struct ww_acquire_ctx *ww_ctx) | |
66cf9a7e | 142 | { |
f8702f9e DO |
143 | bool lock = false; |
144 | int ret = 0; | |
145 | ||
146 | mutex_lock(®ulator_nesting_mutex); | |
147 | ||
148 | if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) { | |
149 | if (rdev->mutex_owner == current) | |
66cf9a7e | 150 | rdev->ref_cnt++; |
f8702f9e DO |
151 | else |
152 | lock = true; | |
153 | ||
154 | if (lock) { | |
155 | mutex_unlock(®ulator_nesting_mutex); | |
156 | ret = ww_mutex_lock(&rdev->mutex, ww_ctx); | |
157 | mutex_lock(®ulator_nesting_mutex); | |
66cf9a7e | 158 | } |
f8702f9e DO |
159 | } else { |
160 | lock = true; | |
66cf9a7e MP |
161 | } |
162 | ||
f8702f9e DO |
163 | if (lock && ret != -EDEADLK) { |
164 | rdev->ref_cnt++; | |
165 | rdev->mutex_owner = current; | |
166 | } | |
167 | ||
168 | mutex_unlock(®ulator_nesting_mutex); | |
169 | ||
170 | return ret; | |
66cf9a7e MP |
171 | } |
172 | ||
f8702f9e DO |
173 | /** |
174 | * regulator_lock - lock a single regulator | |
175 | * @rdev: regulator source | |
176 | * | |
177 | * This function can be called many times by one task on | |
178 | * a single regulator and its mutex will be locked only | |
179 | * once. If a task, which is calling this function is other | |
180 | * than the one, which initially locked the mutex, it will | |
181 | * wait on mutex. | |
182 | */ | |
4c9db393 | 183 | static void regulator_lock(struct regulator_dev *rdev) |
66cf9a7e | 184 | { |
f8702f9e | 185 | regulator_lock_nested(rdev, NULL); |
66cf9a7e MP |
186 | } |
187 | ||
188 | /** | |
189 | * regulator_unlock - unlock a single regulator | |
190 | * @rdev: regulator_source | |
191 | * | |
192 | * This function unlocks the mutex when the | |
193 | * reference counter reaches 0. | |
194 | */ | |
4c9db393 | 195 | static void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 196 | { |
f8702f9e | 197 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 198 | |
f8702f9e DO |
199 | if (--rdev->ref_cnt == 0) { |
200 | rdev->mutex_owner = NULL; | |
201 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 202 | } |
f8702f9e DO |
203 | |
204 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
205 | ||
206 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e MP |
207 | } |
208 | ||
089e2cc2 | 209 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 210 | { |
089e2cc2 DO |
211 | struct regulator_dev *c_rdev; |
212 | int i; | |
213 | ||
214 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
215 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 216 | |
089e2cc2 DO |
217 | if (rdev->supply->rdev == c_rdev) |
218 | return true; | |
219 | } | |
220 | ||
221 | return false; | |
222 | } | |
223 | ||
f8702f9e DO |
224 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
225 | unsigned int n_coupled) | |
9f01cd4a | 226 | { |
0a7416f9 DO |
227 | struct regulator_dev *c_rdev, *supply_rdev; |
228 | int i, supply_n_coupled; | |
9f01cd4a | 229 | |
f8702f9e DO |
230 | for (i = n_coupled; i > 0; i--) { |
231 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
232 | |
233 | if (!c_rdev) | |
234 | continue; | |
235 | ||
0a7416f9 DO |
236 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
237 | supply_rdev = c_rdev->supply->rdev; | |
238 | supply_n_coupled = supply_rdev->coupling_desc.n_coupled; | |
239 | ||
240 | regulator_unlock_recursive(supply_rdev, | |
241 | supply_n_coupled); | |
242 | } | |
9243a195 | 243 | |
f8702f9e DO |
244 | regulator_unlock(c_rdev); |
245 | } | |
9f01cd4a SH |
246 | } |
247 | ||
f8702f9e DO |
248 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
249 | struct regulator_dev **new_contended_rdev, | |
250 | struct regulator_dev **old_contended_rdev, | |
251 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 252 | { |
9243a195 | 253 | struct regulator_dev *c_rdev; |
f8702f9e | 254 | int i, err; |
9f01cd4a | 255 | |
9243a195 MP |
256 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
257 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 258 | |
9243a195 MP |
259 | if (!c_rdev) |
260 | continue; | |
9f01cd4a | 261 | |
f8702f9e DO |
262 | if (c_rdev != *old_contended_rdev) { |
263 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
264 | if (err) { | |
265 | if (err == -EDEADLK) { | |
266 | *new_contended_rdev = c_rdev; | |
267 | goto err_unlock; | |
268 | } | |
9243a195 | 269 | |
f8702f9e DO |
270 | /* shouldn't happen */ |
271 | WARN_ON_ONCE(err != -EALREADY); | |
272 | } | |
273 | } else { | |
274 | *old_contended_rdev = NULL; | |
275 | } | |
276 | ||
089e2cc2 | 277 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
278 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
279 | new_contended_rdev, | |
280 | old_contended_rdev, | |
281 | ww_ctx); | |
282 | if (err) { | |
283 | regulator_unlock(c_rdev); | |
284 | goto err_unlock; | |
285 | } | |
66cf9a7e MP |
286 | } |
287 | } | |
f8702f9e DO |
288 | |
289 | return 0; | |
290 | ||
291 | err_unlock: | |
292 | regulator_unlock_recursive(rdev, i); | |
293 | ||
294 | return err; | |
66cf9a7e MP |
295 | } |
296 | ||
38de19fa | 297 | /** |
f8702f9e DO |
298 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
299 | * regulators | |
300 | * @rdev: regulator source | |
301 | * @ww_ctx: w/w mutex acquire context | |
302 | * | |
48f1b4ef | 303 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 304 | */ |
f8702f9e DO |
305 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
306 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 307 | { |
f8702f9e DO |
308 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
309 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
310 | } |
311 | ||
312 | /** | |
9243a195 MP |
313 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
314 | * @rdev: regulator source | |
f8702f9e | 315 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
316 | * |
317 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 318 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 319 | */ |
f8702f9e DO |
320 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
321 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 322 | { |
f8702f9e DO |
323 | struct regulator_dev *new_contended_rdev = NULL; |
324 | struct regulator_dev *old_contended_rdev = NULL; | |
325 | int err; | |
9f01cd4a | 326 | |
f8702f9e | 327 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 328 | |
f8702f9e | 329 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 330 | |
f8702f9e DO |
331 | do { |
332 | if (new_contended_rdev) { | |
333 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
334 | old_contended_rdev = new_contended_rdev; | |
335 | old_contended_rdev->ref_cnt++; | |
336 | } | |
337 | ||
338 | err = regulator_lock_recursive(rdev, | |
339 | &new_contended_rdev, | |
340 | &old_contended_rdev, | |
341 | ww_ctx); | |
342 | ||
343 | if (old_contended_rdev) | |
344 | regulator_unlock(old_contended_rdev); | |
345 | ||
346 | } while (err == -EDEADLK); | |
347 | ||
348 | ww_acquire_done(ww_ctx); | |
349 | ||
350 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
351 | } |
352 | ||
fe06051d | 353 | /** |
354 | * of_get_child_regulator - get a child regulator device node | |
355 | * based on supply name | |
356 | * @parent: Parent device node | |
357 | * @prop_name: Combination regulator supply name and "-supply" | |
358 | * | |
359 | * Traverse all child nodes. | |
360 | * Extract the child regulator device node corresponding to the supply name. | |
361 | * returns the device node corresponding to the regulator if found, else | |
362 | * returns NULL. | |
363 | */ | |
364 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
365 | const char *prop_name) | |
366 | { | |
367 | struct device_node *regnode = NULL; | |
368 | struct device_node *child = NULL; | |
369 | ||
370 | for_each_child_of_node(parent, child) { | |
371 | regnode = of_parse_phandle(child, prop_name, 0); | |
372 | ||
373 | if (!regnode) { | |
374 | regnode = of_get_child_regulator(child, prop_name); | |
81eeb0a3 ND |
375 | if (regnode) |
376 | goto err_node_put; | |
fe06051d | 377 | } else { |
81eeb0a3 | 378 | goto err_node_put; |
fe06051d | 379 | } |
380 | } | |
381 | return NULL; | |
81eeb0a3 ND |
382 | |
383 | err_node_put: | |
384 | of_node_put(child); | |
385 | return regnode; | |
fe06051d | 386 | } |
387 | ||
69511a45 RN |
388 | /** |
389 | * of_get_regulator - get a regulator device node based on supply name | |
390 | * @dev: Device pointer for the consumer (of regulator) device | |
391 | * @supply: regulator supply name | |
392 | * | |
393 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 394 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
395 | * returns NULL. |
396 | */ | |
397 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
398 | { | |
399 | struct device_node *regnode = NULL; | |
e9bb4a06 | 400 | char prop_name[64]; /* 64 is max size of property name */ |
69511a45 RN |
401 | |
402 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
403 | ||
e9bb4a06 | 404 | snprintf(prop_name, 64, "%s-supply", supply); |
69511a45 RN |
405 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); |
406 | ||
407 | if (!regnode) { | |
fe06051d | 408 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
409 | if (regnode) | |
410 | return regnode; | |
411 | ||
7799167b RH |
412 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
413 | prop_name, dev->of_node); | |
69511a45 RN |
414 | return NULL; |
415 | } | |
416 | return regnode; | |
417 | } | |
418 | ||
414c70cb | 419 | /* Platform voltage constraint check */ |
d22b85a1 DO |
420 | int regulator_check_voltage(struct regulator_dev *rdev, |
421 | int *min_uV, int *max_uV) | |
414c70cb LG |
422 | { |
423 | BUG_ON(*min_uV > *max_uV); | |
424 | ||
8a34e979 | 425 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 426 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
427 | return -EPERM; |
428 | } | |
429 | ||
430 | if (*max_uV > rdev->constraints->max_uV) | |
431 | *max_uV = rdev->constraints->max_uV; | |
432 | if (*min_uV < rdev->constraints->min_uV) | |
433 | *min_uV = rdev->constraints->min_uV; | |
434 | ||
89f425ed MB |
435 | if (*min_uV > *max_uV) { |
436 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 437 | *min_uV, *max_uV); |
414c70cb | 438 | return -EINVAL; |
89f425ed | 439 | } |
414c70cb LG |
440 | |
441 | return 0; | |
442 | } | |
443 | ||
f7efad10 CZ |
444 | /* return 0 if the state is valid */ |
445 | static int regulator_check_states(suspend_state_t state) | |
446 | { | |
447 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
448 | } | |
449 | ||
05fda3b1 TP |
450 | /* Make sure we select a voltage that suits the needs of all |
451 | * regulator consumers | |
452 | */ | |
d22b85a1 DO |
453 | int regulator_check_consumers(struct regulator_dev *rdev, |
454 | int *min_uV, int *max_uV, | |
455 | suspend_state_t state) | |
05fda3b1 TP |
456 | { |
457 | struct regulator *regulator; | |
c360a6df | 458 | struct regulator_voltage *voltage; |
05fda3b1 TP |
459 | |
460 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 461 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
462 | /* |
463 | * Assume consumers that didn't say anything are OK | |
464 | * with anything in the constraint range. | |
465 | */ | |
c360a6df | 466 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
467 | continue; |
468 | ||
c360a6df CZ |
469 | if (*max_uV > voltage->max_uV) |
470 | *max_uV = voltage->max_uV; | |
471 | if (*min_uV < voltage->min_uV) | |
472 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
473 | } |
474 | ||
dd8004af | 475 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
476 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
477 | *min_uV, *max_uV); | |
05fda3b1 | 478 | return -EINVAL; |
dd8004af | 479 | } |
05fda3b1 TP |
480 | |
481 | return 0; | |
482 | } | |
483 | ||
414c70cb LG |
484 | /* current constraint check */ |
485 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
486 | int *min_uA, int *max_uA) | |
487 | { | |
488 | BUG_ON(*min_uA > *max_uA); | |
489 | ||
8a34e979 | 490 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 491 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
492 | return -EPERM; |
493 | } | |
494 | ||
495 | if (*max_uA > rdev->constraints->max_uA) | |
496 | *max_uA = rdev->constraints->max_uA; | |
497 | if (*min_uA < rdev->constraints->min_uA) | |
498 | *min_uA = rdev->constraints->min_uA; | |
499 | ||
89f425ed MB |
500 | if (*min_uA > *max_uA) { |
501 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 502 | *min_uA, *max_uA); |
414c70cb | 503 | return -EINVAL; |
89f425ed | 504 | } |
414c70cb LG |
505 | |
506 | return 0; | |
507 | } | |
508 | ||
509 | /* operating mode constraint check */ | |
109c75af CK |
510 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
511 | unsigned int *mode) | |
414c70cb | 512 | { |
2c608234 | 513 | switch (*mode) { |
e573520b DB |
514 | case REGULATOR_MODE_FAST: |
515 | case REGULATOR_MODE_NORMAL: | |
516 | case REGULATOR_MODE_IDLE: | |
517 | case REGULATOR_MODE_STANDBY: | |
518 | break; | |
519 | default: | |
89f425ed | 520 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
521 | return -EINVAL; |
522 | } | |
523 | ||
8a34e979 | 524 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 525 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
526 | return -EPERM; |
527 | } | |
2c608234 MB |
528 | |
529 | /* The modes are bitmasks, the most power hungry modes having | |
530 | * the lowest values. If the requested mode isn't supported | |
69b8821e SK |
531 | * try higher modes. |
532 | */ | |
2c608234 MB |
533 | while (*mode) { |
534 | if (rdev->constraints->valid_modes_mask & *mode) | |
535 | return 0; | |
536 | *mode /= 2; | |
414c70cb | 537 | } |
2c608234 MB |
538 | |
539 | return -EINVAL; | |
414c70cb LG |
540 | } |
541 | ||
f7efad10 CZ |
542 | static inline struct regulator_state * |
543 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
544 | { | |
545 | if (rdev->constraints == NULL) | |
546 | return NULL; | |
547 | ||
548 | switch (state) { | |
549 | case PM_SUSPEND_STANDBY: | |
550 | return &rdev->constraints->state_standby; | |
551 | case PM_SUSPEND_MEM: | |
552 | return &rdev->constraints->state_mem; | |
553 | case PM_SUSPEND_MAX: | |
554 | return &rdev->constraints->state_disk; | |
555 | default: | |
556 | return NULL; | |
557 | } | |
558 | } | |
559 | ||
0955f5be SB |
560 | static const struct regulator_state * |
561 | regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state) | |
562 | { | |
563 | const struct regulator_state *rstate; | |
564 | ||
565 | rstate = regulator_get_suspend_state(rdev, state); | |
566 | if (rstate == NULL) | |
567 | return NULL; | |
568 | ||
569 | /* If we have no suspend mode configuration don't set anything; | |
570 | * only warn if the driver implements set_suspend_voltage or | |
571 | * set_suspend_mode callback. | |
572 | */ | |
573 | if (rstate->enabled != ENABLE_IN_SUSPEND && | |
574 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
575 | if (rdev->desc->ops->set_suspend_voltage || | |
576 | rdev->desc->ops->set_suspend_mode) | |
577 | rdev_warn(rdev, "No configuration\n"); | |
578 | return NULL; | |
579 | } | |
580 | ||
581 | return rstate; | |
582 | } | |
583 | ||
414c70cb LG |
584 | static ssize_t regulator_uV_show(struct device *dev, |
585 | struct device_attribute *attr, char *buf) | |
586 | { | |
a5766f11 | 587 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
c82f27df | 588 | int uV; |
414c70cb | 589 | |
66cf9a7e | 590 | regulator_lock(rdev); |
c82f27df | 591 | uV = regulator_get_voltage_rdev(rdev); |
66cf9a7e | 592 | regulator_unlock(rdev); |
414c70cb | 593 | |
c82f27df NS |
594 | if (uV < 0) |
595 | return uV; | |
596 | return sprintf(buf, "%d\n", uV); | |
414c70cb | 597 | } |
7ad68e2f | 598 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
599 | |
600 | static ssize_t regulator_uA_show(struct device *dev, | |
601 | struct device_attribute *attr, char *buf) | |
602 | { | |
a5766f11 | 603 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
604 | |
605 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
606 | } | |
7ad68e2f | 607 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 608 | |
587cea27 GKH |
609 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
610 | char *buf) | |
bc558a60 MB |
611 | { |
612 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 613 | |
1083c393 | 614 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 615 | } |
587cea27 | 616 | static DEVICE_ATTR_RO(name); |
bc558a60 | 617 | |
01de19d0 | 618 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 619 | { |
414c70cb LG |
620 | switch (mode) { |
621 | case REGULATOR_MODE_FAST: | |
01de19d0 | 622 | return "fast"; |
414c70cb | 623 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 624 | return "normal"; |
414c70cb | 625 | case REGULATOR_MODE_IDLE: |
01de19d0 | 626 | return "idle"; |
414c70cb | 627 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 628 | return "standby"; |
414c70cb | 629 | } |
01de19d0 DA |
630 | return "unknown"; |
631 | } | |
632 | ||
633 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
634 | { | |
635 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
636 | } |
637 | ||
4fca9545 DB |
638 | static ssize_t regulator_opmode_show(struct device *dev, |
639 | struct device_attribute *attr, char *buf) | |
414c70cb | 640 | { |
a5766f11 | 641 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 642 | |
4fca9545 DB |
643 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
644 | } | |
7ad68e2f | 645 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
646 | |
647 | static ssize_t regulator_print_state(char *buf, int state) | |
648 | { | |
414c70cb LG |
649 | if (state > 0) |
650 | return sprintf(buf, "enabled\n"); | |
651 | else if (state == 0) | |
652 | return sprintf(buf, "disabled\n"); | |
653 | else | |
654 | return sprintf(buf, "unknown\n"); | |
655 | } | |
656 | ||
4fca9545 DB |
657 | static ssize_t regulator_state_show(struct device *dev, |
658 | struct device_attribute *attr, char *buf) | |
659 | { | |
660 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
661 | ssize_t ret; |
662 | ||
66cf9a7e | 663 | regulator_lock(rdev); |
9332546f | 664 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 665 | regulator_unlock(rdev); |
4fca9545 | 666 | |
9332546f | 667 | return ret; |
4fca9545 | 668 | } |
7ad68e2f | 669 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 670 | |
853116a1 DB |
671 | static ssize_t regulator_status_show(struct device *dev, |
672 | struct device_attribute *attr, char *buf) | |
673 | { | |
674 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
675 | int status; | |
676 | char *label; | |
677 | ||
678 | status = rdev->desc->ops->get_status(rdev); | |
679 | if (status < 0) | |
680 | return status; | |
681 | ||
682 | switch (status) { | |
683 | case REGULATOR_STATUS_OFF: | |
684 | label = "off"; | |
685 | break; | |
686 | case REGULATOR_STATUS_ON: | |
687 | label = "on"; | |
688 | break; | |
689 | case REGULATOR_STATUS_ERROR: | |
690 | label = "error"; | |
691 | break; | |
692 | case REGULATOR_STATUS_FAST: | |
693 | label = "fast"; | |
694 | break; | |
695 | case REGULATOR_STATUS_NORMAL: | |
696 | label = "normal"; | |
697 | break; | |
698 | case REGULATOR_STATUS_IDLE: | |
699 | label = "idle"; | |
700 | break; | |
701 | case REGULATOR_STATUS_STANDBY: | |
702 | label = "standby"; | |
703 | break; | |
f59c8f9f MB |
704 | case REGULATOR_STATUS_BYPASS: |
705 | label = "bypass"; | |
706 | break; | |
1beaf762 KG |
707 | case REGULATOR_STATUS_UNDEFINED: |
708 | label = "undefined"; | |
709 | break; | |
853116a1 DB |
710 | default: |
711 | return -ERANGE; | |
712 | } | |
713 | ||
714 | return sprintf(buf, "%s\n", label); | |
715 | } | |
716 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
717 | ||
414c70cb LG |
718 | static ssize_t regulator_min_uA_show(struct device *dev, |
719 | struct device_attribute *attr, char *buf) | |
720 | { | |
a5766f11 | 721 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
722 | |
723 | if (!rdev->constraints) | |
724 | return sprintf(buf, "constraint not defined\n"); | |
725 | ||
726 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
727 | } | |
7ad68e2f | 728 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
729 | |
730 | static ssize_t regulator_max_uA_show(struct device *dev, | |
731 | struct device_attribute *attr, char *buf) | |
732 | { | |
a5766f11 | 733 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
734 | |
735 | if (!rdev->constraints) | |
736 | return sprintf(buf, "constraint not defined\n"); | |
737 | ||
738 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
739 | } | |
7ad68e2f | 740 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
741 | |
742 | static ssize_t regulator_min_uV_show(struct device *dev, | |
743 | struct device_attribute *attr, char *buf) | |
744 | { | |
a5766f11 | 745 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
746 | |
747 | if (!rdev->constraints) | |
748 | return sprintf(buf, "constraint not defined\n"); | |
749 | ||
750 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
751 | } | |
7ad68e2f | 752 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
753 | |
754 | static ssize_t regulator_max_uV_show(struct device *dev, | |
755 | struct device_attribute *attr, char *buf) | |
756 | { | |
a5766f11 | 757 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
758 | |
759 | if (!rdev->constraints) | |
760 | return sprintf(buf, "constraint not defined\n"); | |
761 | ||
762 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
763 | } | |
7ad68e2f | 764 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
765 | |
766 | static ssize_t regulator_total_uA_show(struct device *dev, | |
767 | struct device_attribute *attr, char *buf) | |
768 | { | |
a5766f11 | 769 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
770 | struct regulator *regulator; |
771 | int uA = 0; | |
772 | ||
66cf9a7e | 773 | regulator_lock(rdev); |
5451781d DA |
774 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
775 | if (regulator->enable_count) | |
776 | uA += regulator->uA_load; | |
777 | } | |
66cf9a7e | 778 | regulator_unlock(rdev); |
414c70cb LG |
779 | return sprintf(buf, "%d\n", uA); |
780 | } | |
7ad68e2f | 781 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 782 | |
587cea27 GKH |
783 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
784 | char *buf) | |
414c70cb | 785 | { |
a5766f11 | 786 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
787 | return sprintf(buf, "%d\n", rdev->use_count); |
788 | } | |
587cea27 | 789 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 790 | |
587cea27 GKH |
791 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
792 | char *buf) | |
414c70cb | 793 | { |
a5766f11 | 794 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
795 | |
796 | switch (rdev->desc->type) { | |
797 | case REGULATOR_VOLTAGE: | |
798 | return sprintf(buf, "voltage\n"); | |
799 | case REGULATOR_CURRENT: | |
800 | return sprintf(buf, "current\n"); | |
801 | } | |
802 | return sprintf(buf, "unknown\n"); | |
803 | } | |
587cea27 | 804 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
805 | |
806 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
807 | struct device_attribute *attr, char *buf) | |
808 | { | |
a5766f11 | 809 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 810 | |
414c70cb LG |
811 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
812 | } | |
7ad68e2f DB |
813 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
814 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
815 | |
816 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
817 | struct device_attribute *attr, char *buf) | |
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 | } | |
7ad68e2f DB |
823 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
824 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
825 | |
826 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
827 | struct device_attribute *attr, char *buf) | |
828 | { | |
a5766f11 | 829 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 830 | |
414c70cb LG |
831 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
832 | } | |
7ad68e2f DB |
833 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
834 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 835 | |
414c70cb LG |
836 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
837 | struct device_attribute *attr, char *buf) | |
838 | { | |
a5766f11 | 839 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 840 | |
4fca9545 DB |
841 | return regulator_print_opmode(buf, |
842 | rdev->constraints->state_mem.mode); | |
414c70cb | 843 | } |
7ad68e2f DB |
844 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
845 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
846 | |
847 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
848 | struct device_attribute *attr, char *buf) | |
849 | { | |
a5766f11 | 850 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 851 | |
4fca9545 DB |
852 | return regulator_print_opmode(buf, |
853 | rdev->constraints->state_disk.mode); | |
414c70cb | 854 | } |
7ad68e2f DB |
855 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
856 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
857 | |
858 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
859 | struct device_attribute *attr, char *buf) | |
860 | { | |
a5766f11 | 861 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 862 | |
4fca9545 DB |
863 | return regulator_print_opmode(buf, |
864 | rdev->constraints->state_standby.mode); | |
414c70cb | 865 | } |
7ad68e2f DB |
866 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
867 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
868 | |
869 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
870 | struct device_attribute *attr, char *buf) | |
871 | { | |
a5766f11 | 872 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 873 | |
4fca9545 DB |
874 | return regulator_print_state(buf, |
875 | rdev->constraints->state_mem.enabled); | |
414c70cb | 876 | } |
7ad68e2f DB |
877 | static DEVICE_ATTR(suspend_mem_state, 0444, |
878 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
879 | |
880 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
881 | struct device_attribute *attr, char *buf) | |
882 | { | |
a5766f11 | 883 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 884 | |
4fca9545 DB |
885 | return regulator_print_state(buf, |
886 | rdev->constraints->state_disk.enabled); | |
414c70cb | 887 | } |
7ad68e2f DB |
888 | static DEVICE_ATTR(suspend_disk_state, 0444, |
889 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
890 | |
891 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
892 | struct device_attribute *attr, char *buf) | |
893 | { | |
a5766f11 | 894 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 895 | |
4fca9545 DB |
896 | return regulator_print_state(buf, |
897 | rdev->constraints->state_standby.enabled); | |
414c70cb | 898 | } |
7ad68e2f DB |
899 | static DEVICE_ATTR(suspend_standby_state, 0444, |
900 | regulator_suspend_standby_state_show, NULL); | |
901 | ||
f59c8f9f MB |
902 | static ssize_t regulator_bypass_show(struct device *dev, |
903 | struct device_attribute *attr, char *buf) | |
904 | { | |
905 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
906 | const char *report; | |
907 | bool bypass; | |
908 | int ret; | |
909 | ||
910 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
911 | ||
912 | if (ret != 0) | |
913 | report = "unknown"; | |
914 | else if (bypass) | |
915 | report = "enabled"; | |
916 | else | |
917 | report = "disabled"; | |
918 | ||
919 | return sprintf(buf, "%s\n", report); | |
920 | } | |
921 | static DEVICE_ATTR(bypass, 0444, | |
922 | regulator_bypass_show, NULL); | |
bc558a60 | 923 | |
414c70cb | 924 | /* Calculate the new optimum regulator operating mode based on the new total |
69b8821e SK |
925 | * consumer load. All locks held by caller |
926 | */ | |
8460ef38 | 927 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
928 | { |
929 | struct regulator *sibling; | |
930 | int current_uA = 0, output_uV, input_uV, err; | |
931 | unsigned int mode; | |
932 | ||
8460ef38 BA |
933 | /* |
934 | * first check to see if we can set modes at all, otherwise just | |
935 | * tell the consumer everything is OK. | |
936 | */ | |
74a569ee MG |
937 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
938 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 939 | return 0; |
74a569ee | 940 | } |
8460ef38 | 941 | |
8f4490e0 BA |
942 | if (!rdev->desc->ops->get_optimum_mode && |
943 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
944 | return 0; |
945 | ||
8f4490e0 BA |
946 | if (!rdev->desc->ops->set_mode && |
947 | !rdev->desc->ops->set_load) | |
8460ef38 | 948 | return -EINVAL; |
414c70cb | 949 | |
414c70cb | 950 | /* calc total requested load */ |
5451781d DA |
951 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
952 | if (sibling->enable_count) | |
953 | current_uA += sibling->uA_load; | |
954 | } | |
414c70cb | 955 | |
22a10bca SB |
956 | current_uA += rdev->constraints->system_load; |
957 | ||
8f4490e0 BA |
958 | if (rdev->desc->ops->set_load) { |
959 | /* set the optimum mode for our new total regulator load */ | |
960 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
961 | if (err < 0) | |
61aab5ad MM |
962 | rdev_err(rdev, "failed to set load %d: %pe\n", |
963 | current_uA, ERR_PTR(err)); | |
8f4490e0 | 964 | } else { |
57776617 | 965 | /* get output voltage */ |
d22b85a1 | 966 | output_uV = regulator_get_voltage_rdev(rdev); |
57776617 JP |
967 | if (output_uV <= 0) { |
968 | rdev_err(rdev, "invalid output voltage found\n"); | |
969 | return -EINVAL; | |
970 | } | |
971 | ||
972 | /* get input voltage */ | |
973 | input_uV = 0; | |
974 | if (rdev->supply) | |
975 | input_uV = regulator_get_voltage(rdev->supply); | |
976 | if (input_uV <= 0) | |
977 | input_uV = rdev->constraints->input_uV; | |
978 | if (input_uV <= 0) { | |
979 | rdev_err(rdev, "invalid input voltage found\n"); | |
980 | return -EINVAL; | |
981 | } | |
982 | ||
8f4490e0 BA |
983 | /* now get the optimum mode for our new total regulator load */ |
984 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
985 | output_uV, current_uA); | |
986 | ||
987 | /* check the new mode is allowed */ | |
988 | err = regulator_mode_constrain(rdev, &mode); | |
989 | if (err < 0) { | |
61aab5ad MM |
990 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n", |
991 | current_uA, input_uV, output_uV, ERR_PTR(err)); | |
8f4490e0 BA |
992 | return err; |
993 | } | |
414c70cb | 994 | |
8f4490e0 BA |
995 | err = rdev->desc->ops->set_mode(rdev, mode); |
996 | if (err < 0) | |
61aab5ad MM |
997 | rdev_err(rdev, "failed to set optimum mode %x: %pe\n", |
998 | mode, ERR_PTR(err)); | |
8460ef38 BA |
999 | } |
1000 | ||
8460ef38 | 1001 | return err; |
414c70cb LG |
1002 | } |
1003 | ||
0955f5be SB |
1004 | static int __suspend_set_state(struct regulator_dev *rdev, |
1005 | const struct regulator_state *rstate) | |
414c70cb LG |
1006 | { |
1007 | int ret = 0; | |
638f85c5 | 1008 | |
72069f99 CZ |
1009 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1010 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1011 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1012 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1013 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1014 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1015 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1016 | ret = 0; | |
1017 | ||
414c70cb | 1018 | if (ret < 0) { |
61aab5ad | 1019 | rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1020 | return ret; |
1021 | } | |
1022 | ||
1023 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1024 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1025 | if (ret < 0) { | |
61aab5ad | 1026 | rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1027 | return ret; |
1028 | } | |
1029 | } | |
1030 | ||
1031 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1032 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1033 | if (ret < 0) { | |
61aab5ad | 1034 | rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1035 | return ret; |
1036 | } | |
1037 | } | |
414c70cb | 1038 | |
f7efad10 | 1039 | return ret; |
414c70cb LG |
1040 | } |
1041 | ||
0955f5be SB |
1042 | static int suspend_set_initial_state(struct regulator_dev *rdev) |
1043 | { | |
1044 | const struct regulator_state *rstate; | |
1045 | ||
1046 | rstate = regulator_get_suspend_state_check(rdev, | |
1047 | rdev->constraints->initial_state); | |
1048 | if (!rstate) | |
1049 | return 0; | |
1050 | ||
1051 | return __suspend_set_state(rdev, rstate); | |
1052 | } | |
1053 | ||
c845f21a GU |
1054 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
1055 | static void print_constraints_debug(struct regulator_dev *rdev) | |
414c70cb LG |
1056 | { |
1057 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1058 | char buf[160] = ""; |
5751a99f | 1059 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1060 | int count = 0; |
1061 | int ret; | |
414c70cb | 1062 | |
8f031b48 | 1063 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1064 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1065 | count += scnprintf(buf + count, len - count, "%d mV ", |
1066 | constraints->min_uV / 1000); | |
414c70cb | 1067 | else |
5751a99f SW |
1068 | count += scnprintf(buf + count, len - count, |
1069 | "%d <--> %d mV ", | |
1070 | constraints->min_uV / 1000, | |
1071 | constraints->max_uV / 1000); | |
8f031b48 MB |
1072 | } |
1073 | ||
1074 | if (!constraints->min_uV || | |
1075 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1076 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1077 | if (ret > 0) |
5751a99f SW |
1078 | count += scnprintf(buf + count, len - count, |
1079 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1080 | } |
1081 | ||
bf5892a8 | 1082 | if (constraints->uV_offset) |
5751a99f SW |
1083 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1084 | constraints->uV_offset / 1000); | |
bf5892a8 | 1085 | |
8f031b48 | 1086 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1087 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1088 | count += scnprintf(buf + count, len - count, "%d mA ", |
1089 | constraints->min_uA / 1000); | |
414c70cb | 1090 | else |
5751a99f SW |
1091 | count += scnprintf(buf + count, len - count, |
1092 | "%d <--> %d mA ", | |
1093 | constraints->min_uA / 1000, | |
1094 | constraints->max_uA / 1000); | |
8f031b48 MB |
1095 | } |
1096 | ||
1097 | if (!constraints->min_uA || | |
1098 | constraints->min_uA != constraints->max_uA) { | |
1099 | ret = _regulator_get_current_limit(rdev); | |
1100 | if (ret > 0) | |
5751a99f SW |
1101 | count += scnprintf(buf + count, len - count, |
1102 | "at %d mA ", ret / 1000); | |
414c70cb | 1103 | } |
8f031b48 | 1104 | |
414c70cb | 1105 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1106 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1107 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1108 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1109 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1110 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1111 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
99ad5f6e | 1112 | count += scnprintf(buf + count, len - count, "standby "); |
414c70cb | 1113 | |
215b8b05 | 1114 | if (!count) |
99ad5f6e MM |
1115 | count = scnprintf(buf, len, "no parameters"); |
1116 | else | |
1117 | --count; | |
1118 | ||
1119 | count += scnprintf(buf + count, len - count, ", %s", | |
1120 | _regulator_is_enabled(rdev) ? "enabled" : "disabled"); | |
215b8b05 | 1121 | |
194dbaef | 1122 | rdev_dbg(rdev, "%s\n", buf); |
c845f21a GU |
1123 | } |
1124 | #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1125 | static inline void print_constraints_debug(struct regulator_dev *rdev) {} | |
1126 | #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1127 | ||
1128 | static void print_constraints(struct regulator_dev *rdev) | |
1129 | { | |
1130 | struct regulation_constraints *constraints = rdev->constraints; | |
1131 | ||
1132 | print_constraints_debug(rdev); | |
4a682922 MB |
1133 | |
1134 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1135 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1136 | rdev_warn(rdev, |
1137 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1138 | } |
1139 | ||
e79055d6 | 1140 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1141 | struct regulation_constraints *constraints) |
a5766f11 | 1142 | { |
272e2315 | 1143 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1144 | int ret; |
1145 | ||
1146 | /* do we need to apply the constraint voltage */ | |
1147 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1148 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1149 | int target_min, target_max; | |
d22b85a1 | 1150 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1151 | |
1152 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1153 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1154 | rdev_info(rdev, "Setting %d-%duV\n", |
1155 | rdev->constraints->min_uV, | |
1156 | rdev->constraints->max_uV); | |
1157 | _regulator_do_set_voltage(rdev, | |
1158 | rdev->constraints->min_uV, | |
1159 | rdev->constraints->max_uV); | |
d22b85a1 | 1160 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1161 | } |
1162 | ||
064d5cd1 | 1163 | if (current_uV < 0) { |
69d58839 | 1164 | rdev_err(rdev, |
61aab5ad MM |
1165 | "failed to get the current voltage: %pe\n", |
1166 | ERR_PTR(current_uV)); | |
064d5cd1 AB |
1167 | return current_uV; |
1168 | } | |
fa93fd4e MB |
1169 | |
1170 | /* | |
1171 | * If we're below the minimum voltage move up to the | |
1172 | * minimum voltage, if we're above the maximum voltage | |
1173 | * then move down to the maximum. | |
1174 | */ | |
1175 | target_min = current_uV; | |
1176 | target_max = current_uV; | |
1177 | ||
1178 | if (current_uV < rdev->constraints->min_uV) { | |
1179 | target_min = rdev->constraints->min_uV; | |
1180 | target_max = rdev->constraints->min_uV; | |
1181 | } | |
1182 | ||
1183 | if (current_uV > rdev->constraints->max_uV) { | |
1184 | target_min = rdev->constraints->max_uV; | |
1185 | target_max = rdev->constraints->max_uV; | |
1186 | } | |
1187 | ||
1188 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1189 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1190 | current_uV, target_min, target_max); | |
064d5cd1 | 1191 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1192 | rdev, target_min, target_max); |
064d5cd1 AB |
1193 | if (ret < 0) { |
1194 | rdev_err(rdev, | |
61aab5ad MM |
1195 | "failed to apply %d-%duV constraint: %pe\n", |
1196 | target_min, target_max, ERR_PTR(ret)); | |
064d5cd1 AB |
1197 | return ret; |
1198 | } | |
75790251 | 1199 | } |
af5866c9 | 1200 | } |
e06f5b4f | 1201 | |
4367cfdc DB |
1202 | /* constrain machine-level voltage specs to fit |
1203 | * the actual range supported by this regulator. | |
1204 | */ | |
1205 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1206 | int count = rdev->desc->n_voltages; | |
1207 | int i; | |
1208 | int min_uV = INT_MAX; | |
1209 | int max_uV = INT_MIN; | |
1210 | int cmin = constraints->min_uV; | |
1211 | int cmax = constraints->max_uV; | |
1212 | ||
3e590918 | 1213 | /* it's safe to autoconfigure fixed-voltage supplies |
69b8821e SK |
1214 | * and the constraints are used by list_voltage. |
1215 | */ | |
4367cfdc | 1216 | if (count == 1 && !cmin) { |
3e590918 | 1217 | cmin = 1; |
4367cfdc | 1218 | cmax = INT_MAX; |
3e590918 MB |
1219 | constraints->min_uV = cmin; |
1220 | constraints->max_uV = cmax; | |
4367cfdc DB |
1221 | } |
1222 | ||
3e2b9abd MB |
1223 | /* voltage constraints are optional */ |
1224 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1225 | return 0; |
3e2b9abd | 1226 | |
4367cfdc | 1227 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1228 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1229 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1230 | return -EINVAL; |
4367cfdc DB |
1231 | } |
1232 | ||
6d30fc51 CM |
1233 | /* no need to loop voltages if range is continuous */ |
1234 | if (rdev->desc->continuous_voltage_range) | |
1235 | return 0; | |
1236 | ||
4367cfdc DB |
1237 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1238 | for (i = 0; i < count; i++) { | |
1239 | int value; | |
1240 | ||
1241 | value = ops->list_voltage(rdev, i); | |
1242 | if (value <= 0) | |
1243 | continue; | |
1244 | ||
1245 | /* maybe adjust [min_uV..max_uV] */ | |
1246 | if (value >= cmin && value < min_uV) | |
1247 | min_uV = value; | |
1248 | if (value <= cmax && value > max_uV) | |
1249 | max_uV = value; | |
1250 | } | |
1251 | ||
1252 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1253 | if (max_uV < min_uV) { | |
fff15bef MB |
1254 | rdev_err(rdev, |
1255 | "unsupportable voltage constraints %u-%uuV\n", | |
1256 | min_uV, max_uV); | |
e79055d6 | 1257 | return -EINVAL; |
4367cfdc DB |
1258 | } |
1259 | ||
1260 | /* use regulator's subset of machine constraints */ | |
1261 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1262 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1263 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1264 | constraints->min_uV = min_uV; |
1265 | } | |
1266 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1267 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1268 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1269 | constraints->max_uV = max_uV; |
1270 | } | |
1271 | } | |
1272 | ||
e79055d6 MB |
1273 | return 0; |
1274 | } | |
1275 | ||
f8c1700d LD |
1276 | static int machine_constraints_current(struct regulator_dev *rdev, |
1277 | struct regulation_constraints *constraints) | |
1278 | { | |
272e2315 | 1279 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1280 | int ret; |
1281 | ||
1282 | if (!constraints->min_uA && !constraints->max_uA) | |
1283 | return 0; | |
1284 | ||
1285 | if (constraints->min_uA > constraints->max_uA) { | |
1286 | rdev_err(rdev, "Invalid current constraints\n"); | |
1287 | return -EINVAL; | |
1288 | } | |
1289 | ||
1290 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1291 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | /* Set regulator current in constraints range */ | |
1296 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1297 | constraints->max_uA); | |
1298 | if (ret < 0) { | |
1299 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1300 | return ret; | |
1301 | } | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
30c21971 MP |
1306 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1307 | ||
e79055d6 MB |
1308 | /** |
1309 | * set_machine_constraints - sets regulator constraints | |
1310 | * @rdev: regulator source | |
e79055d6 MB |
1311 | * |
1312 | * Allows platform initialisation code to define and constrain | |
1313 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1314 | * Constraints *must* be set by platform code in order for some | |
1315 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1316 | * set_mode. | |
1317 | */ | |
57a6ad48 | 1318 | static int set_machine_constraints(struct regulator_dev *rdev) |
e79055d6 MB |
1319 | { |
1320 | int ret = 0; | |
272e2315 | 1321 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1322 | |
f8c12fe3 | 1323 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1324 | if (ret != 0) |
6333ef46 | 1325 | return ret; |
e79055d6 | 1326 | |
f8c1700d | 1327 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1328 | if (ret != 0) |
6333ef46 | 1329 | return ret; |
e79055d6 | 1330 | |
36e4f839 SB |
1331 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1332 | ret = ops->set_input_current_limit(rdev, | |
1333 | rdev->constraints->ilim_uA); | |
1334 | if (ret < 0) { | |
61aab5ad | 1335 | rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1336 | return ret; |
36e4f839 SB |
1337 | } |
1338 | } | |
1339 | ||
a5766f11 | 1340 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1341 | if (rdev->constraints->initial_state) { |
0955f5be | 1342 | ret = suspend_set_initial_state(rdev); |
e06f5b4f | 1343 | if (ret < 0) { |
61aab5ad | 1344 | rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1345 | return ret; |
e06f5b4f MB |
1346 | } |
1347 | } | |
a5766f11 | 1348 | |
9a8f5e07 | 1349 | if (rdev->constraints->initial_mode) { |
a308466c | 1350 | if (!ops->set_mode) { |
5da84fd9 | 1351 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1352 | return -EINVAL; |
a308466c MB |
1353 | } |
1354 | ||
f8c12fe3 | 1355 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1356 | if (ret < 0) { |
61aab5ad | 1357 | rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1358 | return ret; |
a308466c | 1359 | } |
fa94e48e DA |
1360 | } else if (rdev->constraints->system_load) { |
1361 | /* | |
1362 | * We'll only apply the initial system load if an | |
1363 | * initial mode wasn't specified. | |
1364 | */ | |
1365 | drms_uA_update(rdev); | |
a308466c MB |
1366 | } |
1367 | ||
1653ccf4 YSB |
1368 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1369 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1370 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1371 | if (ret < 0) { | |
61aab5ad | 1372 | rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1373 | return ret; |
6f0b2c69 YSB |
1374 | } |
1375 | } | |
1376 | ||
23c779b9 SB |
1377 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1378 | ret = ops->set_pull_down(rdev); | |
1379 | if (ret < 0) { | |
61aab5ad | 1380 | rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1381 | return ret; |
23c779b9 SB |
1382 | } |
1383 | } | |
1384 | ||
57f66b78 SB |
1385 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1386 | ret = ops->set_soft_start(rdev); | |
1387 | if (ret < 0) { | |
61aab5ad | 1388 | rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1389 | return ret; |
57f66b78 SB |
1390 | } |
1391 | } | |
1392 | ||
3a003bae SB |
1393 | if (rdev->constraints->over_current_protection |
1394 | && ops->set_over_current_protection) { | |
1395 | ret = ops->set_over_current_protection(rdev); | |
1396 | if (ret < 0) { | |
61aab5ad MM |
1397 | rdev_err(rdev, "failed to set over current protection: %pe\n", |
1398 | ERR_PTR(ret)); | |
6333ef46 | 1399 | return ret; |
3a003bae SB |
1400 | } |
1401 | } | |
1402 | ||
670666b9 LD |
1403 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1404 | bool ad_state = (rdev->constraints->active_discharge == | |
1405 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1406 | ||
1407 | ret = ops->set_active_discharge(rdev, ad_state); | |
1408 | if (ret < 0) { | |
61aab5ad | 1409 | rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret)); |
670666b9 LD |
1410 | return ret; |
1411 | } | |
1412 | } | |
1413 | ||
2bb16663 OS |
1414 | /* If the constraints say the regulator should be on at this point |
1415 | * and we have control then make sure it is enabled. | |
1416 | */ | |
1417 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
05f224ca DA |
1418 | if (rdev->supply) { |
1419 | ret = regulator_enable(rdev->supply); | |
1420 | if (ret < 0) { | |
1421 | _regulator_put(rdev->supply); | |
1422 | rdev->supply = NULL; | |
1423 | return ret; | |
1424 | } | |
1425 | } | |
1426 | ||
2bb16663 OS |
1427 | ret = _regulator_do_enable(rdev); |
1428 | if (ret < 0 && ret != -EINVAL) { | |
61aab5ad | 1429 | rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret)); |
2bb16663 OS |
1430 | return ret; |
1431 | } | |
089b3f61 PP |
1432 | |
1433 | if (rdev->constraints->always_on) | |
1434 | rdev->use_count++; | |
a5ccccb3 | 1435 | } else if (rdev->desc->off_on_delay) { |
a8ce7bd8 | 1436 | rdev->last_off = ktime_get(); |
2bb16663 OS |
1437 | } |
1438 | ||
a5766f11 | 1439 | print_constraints(rdev); |
1a6958e7 | 1440 | return 0; |
a5766f11 LG |
1441 | } |
1442 | ||
1443 | /** | |
1444 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1445 | * @rdev: regulator name |
1446 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1447 | * |
1448 | * Called by platform initialisation code to set the supply regulator for this | |
1449 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1450 | * core if it's child is enabled. | |
1451 | */ | |
1452 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1453 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1454 | { |
1455 | int err; | |
1456 | ||
3801b86a MB |
1457 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1458 | ||
e2c09ae7 JMC |
1459 | if (!try_module_get(supply_rdev->owner)) |
1460 | return -ENODEV; | |
1461 | ||
3801b86a | 1462 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1463 | if (rdev->supply == NULL) { |
1464 | err = -ENOMEM; | |
3801b86a | 1465 | return err; |
a5766f11 | 1466 | } |
57ad526a | 1467 | supply_rdev->open_count++; |
3801b86a MB |
1468 | |
1469 | return 0; | |
a5766f11 LG |
1470 | } |
1471 | ||
1472 | /** | |
06c63f93 | 1473 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1474 | * @rdev: regulator source |
40f9244f | 1475 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1476 | * @supply: symbolic name for supply |
a5766f11 LG |
1477 | * |
1478 | * Allows platform initialisation code to map physical regulator | |
1479 | * sources to symbolic names for supplies for use by devices. Devices | |
1480 | * should use these symbolic names to request regulators, avoiding the | |
1481 | * need to provide board-specific regulator names as platform data. | |
1482 | */ | |
1483 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1484 | const char *consumer_dev_name, |
1485 | const char *supply) | |
a5766f11 | 1486 | { |
5c065401 | 1487 | struct regulator_map *node, *new_node; |
9ed2099e | 1488 | int has_dev; |
a5766f11 LG |
1489 | |
1490 | if (supply == NULL) | |
1491 | return -EINVAL; | |
1492 | ||
9ed2099e MB |
1493 | if (consumer_dev_name != NULL) |
1494 | has_dev = 1; | |
1495 | else | |
1496 | has_dev = 0; | |
1497 | ||
5c065401 MM |
1498 | new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1499 | if (new_node == NULL) | |
1500 | return -ENOMEM; | |
1501 | ||
1502 | new_node->regulator = rdev; | |
1503 | new_node->supply = supply; | |
1504 | ||
1505 | if (has_dev) { | |
1506 | new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1507 | if (new_node->dev_name == NULL) { | |
1508 | kfree(new_node); | |
1509 | return -ENOMEM; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | mutex_lock(®ulator_list_mutex); | |
6001e13c | 1514 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1515 | if (node->dev_name && consumer_dev_name) { |
1516 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1517 | continue; | |
1518 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1519 | continue; |
23b5cc2a JN |
1520 | } |
1521 | ||
6001e13c DB |
1522 | if (strcmp(node->supply, supply) != 0) |
1523 | continue; | |
1524 | ||
737f360d MB |
1525 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1526 | consumer_dev_name, | |
1527 | dev_name(&node->regulator->dev), | |
1528 | node->regulator->desc->name, | |
1529 | supply, | |
1530 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
5c065401 | 1531 | goto fail; |
6001e13c DB |
1532 | } |
1533 | ||
5c065401 MM |
1534 | list_add(&new_node->list, ®ulator_map_list); |
1535 | mutex_unlock(®ulator_list_mutex); | |
40f9244f | 1536 | |
a5766f11 | 1537 | return 0; |
5c065401 MM |
1538 | |
1539 | fail: | |
1540 | mutex_unlock(®ulator_list_mutex); | |
1541 | kfree(new_node->dev_name); | |
1542 | kfree(new_node); | |
1543 | return -EBUSY; | |
a5766f11 LG |
1544 | } |
1545 | ||
0f1d747b MR |
1546 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1547 | { | |
1548 | struct regulator_map *node, *n; | |
1549 | ||
1550 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1551 | if (rdev == node->regulator) { | |
1552 | list_del(&node->list); | |
40f9244f | 1553 | kfree(node->dev_name); |
0f1d747b | 1554 | kfree(node); |
0f1d747b MR |
1555 | } |
1556 | } | |
1557 | } | |
1558 | ||
2d80a91b RF |
1559 | #ifdef CONFIG_DEBUG_FS |
1560 | static ssize_t constraint_flags_read_file(struct file *file, | |
1561 | char __user *user_buf, | |
1562 | size_t count, loff_t *ppos) | |
1563 | { | |
1564 | const struct regulator *regulator = file->private_data; | |
1565 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1566 | char *buf; | |
1567 | ssize_t ret; | |
1568 | ||
1569 | if (!c) | |
1570 | return 0; | |
1571 | ||
1572 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1573 | if (!buf) | |
1574 | return -ENOMEM; | |
1575 | ||
1576 | ret = snprintf(buf, PAGE_SIZE, | |
1577 | "always_on: %u\n" | |
1578 | "boot_on: %u\n" | |
1579 | "apply_uV: %u\n" | |
1580 | "ramp_disable: %u\n" | |
1581 | "soft_start: %u\n" | |
1582 | "pull_down: %u\n" | |
1583 | "over_current_protection: %u\n", | |
1584 | c->always_on, | |
1585 | c->boot_on, | |
1586 | c->apply_uV, | |
1587 | c->ramp_disable, | |
1588 | c->soft_start, | |
1589 | c->pull_down, | |
1590 | c->over_current_protection); | |
1591 | ||
1592 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1593 | kfree(buf); | |
1594 | ||
1595 | return ret; | |
1596 | } | |
1597 | ||
1598 | #endif | |
1599 | ||
1600 | static const struct file_operations constraint_flags_fops = { | |
1601 | #ifdef CONFIG_DEBUG_FS | |
1602 | .open = simple_open, | |
1603 | .read = constraint_flags_read_file, | |
1604 | .llseek = default_llseek, | |
1605 | #endif | |
1606 | }; | |
1607 | ||
f5726ae3 | 1608 | #define REG_STR_SIZE 64 |
414c70cb LG |
1609 | |
1610 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1611 | struct device *dev, | |
1612 | const char *supply_name) | |
1613 | { | |
1614 | struct regulator *regulator; | |
dbe954d8 | 1615 | int err = 0; |
87fe29b6 MM |
1616 | |
1617 | if (dev) { | |
1618 | char buf[REG_STR_SIZE]; | |
1619 | int size; | |
1620 | ||
1621 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", | |
1622 | dev->kobj.name, supply_name); | |
1623 | if (size >= REG_STR_SIZE) | |
1624 | return NULL; | |
1625 | ||
1626 | supply_name = kstrdup(buf, GFP_KERNEL); | |
1627 | if (supply_name == NULL) | |
1628 | return NULL; | |
1629 | } else { | |
1630 | supply_name = kstrdup_const(supply_name, GFP_KERNEL); | |
1631 | if (supply_name == NULL) | |
1632 | return NULL; | |
1633 | } | |
414c70cb LG |
1634 | |
1635 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
87fe29b6 MM |
1636 | if (regulator == NULL) { |
1637 | kfree(supply_name); | |
414c70cb | 1638 | return NULL; |
87fe29b6 | 1639 | } |
414c70cb | 1640 | |
414c70cb | 1641 | regulator->rdev = rdev; |
87fe29b6 MM |
1642 | regulator->supply_name = supply_name; |
1643 | ||
1644 | regulator_lock(rdev); | |
414c70cb | 1645 | list_add(®ulator->list, &rdev->consumer_list); |
87fe29b6 | 1646 | regulator_unlock(rdev); |
414c70cb LG |
1647 | |
1648 | if (dev) { | |
e2c98eaf SG |
1649 | regulator->dev = dev; |
1650 | ||
222cc7b1 | 1651 | /* Add a link to the device sysfs entry */ |
ff268b56 | 1652 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
87fe29b6 | 1653 | supply_name); |
414c70cb | 1654 | if (err) { |
61aab5ad MM |
1655 | rdev_dbg(rdev, "could not add device link %s: %pe\n", |
1656 | dev->kobj.name, ERR_PTR(err)); | |
222cc7b1 | 1657 | /* non-fatal */ |
414c70cb | 1658 | } |
5de70519 MB |
1659 | } |
1660 | ||
dbe954d8 HG |
1661 | if (err != -EEXIST) |
1662 | regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); | |
24751434 | 1663 | if (!regulator->debugfs) { |
ad3a942b | 1664 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1665 | } else { |
1666 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1667 | ®ulator->uA_load); | |
1668 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1669 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1670 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1671 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1672 | debugfs_create_file("constraint_flags", 0444, |
1673 | regulator->debugfs, regulator, | |
1674 | &constraint_flags_fops); | |
414c70cb | 1675 | } |
5de70519 | 1676 | |
6492bc1b MB |
1677 | /* |
1678 | * Check now if the regulator is an always on regulator - if | |
1679 | * it is then we don't need to do nearly so much work for | |
1680 | * enable/disable calls. | |
1681 | */ | |
8a34e979 | 1682 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1683 | _regulator_is_enabled(rdev)) |
1684 | regulator->always_on = true; | |
1685 | ||
414c70cb | 1686 | return regulator; |
414c70cb LG |
1687 | } |
1688 | ||
31aae2be MB |
1689 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1690 | { | |
00c877c6 LD |
1691 | if (rdev->constraints && rdev->constraints->enable_time) |
1692 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1693 | if (rdev->desc->ops->enable_time) |
1694 | return rdev->desc->ops->enable_time(rdev); | |
1695 | return rdev->desc->enable_time; | |
31aae2be MB |
1696 | } |
1697 | ||
a06ccd9c CK |
1698 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1699 | struct device *dev, const char *supply) | |
1700 | { | |
1701 | struct regulator_supply_alias *map; | |
1702 | ||
1703 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1704 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1705 | return map; | |
1706 | ||
1707 | return NULL; | |
1708 | } | |
1709 | ||
1710 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1711 | { | |
1712 | struct regulator_supply_alias *map; | |
1713 | ||
1714 | map = regulator_find_supply_alias(*dev, *supply); | |
1715 | if (map) { | |
1716 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1717 | *supply, map->alias_supply, | |
1718 | dev_name(map->alias_dev)); | |
1719 | *dev = map->alias_dev; | |
1720 | *supply = map->alias_supply; | |
1721 | } | |
1722 | } | |
1723 | ||
85f3b431 TV |
1724 | static int regulator_match(struct device *dev, const void *data) |
1725 | { | |
1726 | struct regulator_dev *r = dev_to_rdev(dev); | |
1727 | ||
1728 | return strcmp(rdev_get_name(r), data) == 0; | |
1729 | } | |
1730 | ||
1731 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1732 | { | |
1733 | struct device *dev; | |
1734 | ||
1735 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1736 | ||
1737 | return dev ? dev_to_rdev(dev) : NULL; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * regulator_dev_lookup - lookup a regulator device. | |
1742 | * @dev: device for regulator "consumer". | |
1743 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1744 | * |
1745 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1746 | * @supply and with the embedded struct device refcount incremented by one. |
1747 | * The refcount must be dropped by calling put_device(). | |
1748 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1749 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1750 | * in the future. | |
85f3b431 | 1751 | */ |
69511a45 | 1752 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1753 | const char *supply) |
69511a45 | 1754 | { |
06217197 | 1755 | struct regulator_dev *r = NULL; |
69511a45 | 1756 | struct device_node *node; |
576ca436 MB |
1757 | struct regulator_map *map; |
1758 | const char *devname = NULL; | |
69511a45 | 1759 | |
a06ccd9c CK |
1760 | regulator_supply_alias(&dev, &supply); |
1761 | ||
69511a45 RN |
1762 | /* first do a dt based lookup */ |
1763 | if (dev && dev->of_node) { | |
1764 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1765 | if (node) { |
85f3b431 TV |
1766 | r = of_find_regulator_by_node(node); |
1767 | if (r) | |
1768 | return r; | |
163478da | 1769 | |
6d191a5f | 1770 | /* |
163478da DT |
1771 | * We have a node, but there is no device. |
1772 | * assume it has not registered yet. | |
6d191a5f | 1773 | */ |
163478da | 1774 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1775 | } |
69511a45 RN |
1776 | } |
1777 | ||
1778 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1779 | if (dev) |
1780 | devname = dev_name(dev); | |
1781 | ||
85f3b431 | 1782 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1783 | list_for_each_entry(map, ®ulator_map_list, list) { |
1784 | /* If the mapping has a device set up it must match */ | |
1785 | if (map->dev_name && | |
1786 | (!devname || strcmp(map->dev_name, devname))) | |
1787 | continue; | |
1788 | ||
85f3b431 TV |
1789 | if (strcmp(map->supply, supply) == 0 && |
1790 | get_device(&map->regulator->dev)) { | |
163478da DT |
1791 | r = map->regulator; |
1792 | break; | |
85f3b431 | 1793 | } |
576ca436 | 1794 | } |
85f3b431 | 1795 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1796 | |
06217197 CK |
1797 | if (r) |
1798 | return r; | |
1799 | ||
1800 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1801 | if (r) |
1802 | return r; | |
1803 | ||
1804 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1805 | } |
1806 | ||
6261b06d BA |
1807 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1808 | { | |
1809 | struct regulator_dev *r; | |
1810 | struct device *dev = rdev->dev.parent; | |
eaa7995c | 1811 | int ret = 0; |
6261b06d | 1812 | |
48f1b4ef | 1813 | /* No supply to resolve? */ |
6261b06d BA |
1814 | if (!rdev->supply_name) |
1815 | return 0; | |
1816 | ||
eaa7995c | 1817 | /* Supply already resolved? (fast-path without locking contention) */ |
6261b06d BA |
1818 | if (rdev->supply) |
1819 | return 0; | |
1820 | ||
163478da DT |
1821 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1822 | if (IS_ERR(r)) { | |
1823 | ret = PTR_ERR(r); | |
1824 | ||
06423121 MB |
1825 | /* Did the lookup explicitly defer for us? */ |
1826 | if (ret == -EPROBE_DEFER) | |
eaa7995c | 1827 | goto out; |
06423121 | 1828 | |
9f7e25ed MB |
1829 | if (have_full_constraints()) { |
1830 | r = dummy_regulator_rdev; | |
85f3b431 | 1831 | get_device(&r->dev); |
9f7e25ed MB |
1832 | } else { |
1833 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1834 | rdev->supply_name, rdev->desc->name); | |
eaa7995c DC |
1835 | ret = -EPROBE_DEFER; |
1836 | goto out; | |
9f7e25ed | 1837 | } |
6261b06d BA |
1838 | } |
1839 | ||
4b639e25 MM |
1840 | if (r == rdev) { |
1841 | dev_err(dev, "Supply for %s (%s) resolved to itself\n", | |
1842 | rdev->desc->name, rdev->supply_name); | |
eaa7995c DC |
1843 | if (!have_full_constraints()) { |
1844 | ret = -EINVAL; | |
1845 | goto out; | |
1846 | } | |
f5c042b2 MM |
1847 | r = dummy_regulator_rdev; |
1848 | get_device(&r->dev); | |
4b639e25 MM |
1849 | } |
1850 | ||
66d228a2 JH |
1851 | /* |
1852 | * If the supply's parent device is not the same as the | |
1853 | * regulator's parent device, then ensure the parent device | |
1854 | * is bound before we resolve the supply, in case the parent | |
1855 | * device get probe deferred and unregisters the supply. | |
1856 | */ | |
1857 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1858 | if (!device_is_bound(r->dev.parent)) { | |
1859 | put_device(&r->dev); | |
eaa7995c DC |
1860 | ret = -EPROBE_DEFER; |
1861 | goto out; | |
66d228a2 JH |
1862 | } |
1863 | } | |
1864 | ||
6261b06d BA |
1865 | /* Recursively resolve the supply of the supply */ |
1866 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1867 | if (ret < 0) { |
1868 | put_device(&r->dev); | |
eaa7995c | 1869 | goto out; |
85f3b431 | 1870 | } |
6261b06d | 1871 | |
14a71d50 MB |
1872 | /* |
1873 | * Recheck rdev->supply with rdev->mutex lock held to avoid a race | |
1874 | * between rdev->supply null check and setting rdev->supply in | |
1875 | * set_supply() from concurrent tasks. | |
1876 | */ | |
1877 | regulator_lock(rdev); | |
1878 | ||
1879 | /* Supply just resolved by a concurrent task? */ | |
1880 | if (rdev->supply) { | |
1881 | regulator_unlock(rdev); | |
1882 | put_device(&r->dev); | |
1883 | goto out; | |
1884 | } | |
1885 | ||
6261b06d | 1886 | ret = set_supply(rdev, r); |
85f3b431 | 1887 | if (ret < 0) { |
14a71d50 | 1888 | regulator_unlock(rdev); |
85f3b431 | 1889 | put_device(&r->dev); |
eaa7995c | 1890 | goto out; |
85f3b431 | 1891 | } |
6261b06d | 1892 | |
14a71d50 MB |
1893 | regulator_unlock(rdev); |
1894 | ||
05f224ca DA |
1895 | /* |
1896 | * In set_machine_constraints() we may have turned this regulator on | |
1897 | * but we couldn't propagate to the supply if it hadn't been resolved | |
1898 | * yet. Do it now. | |
1899 | */ | |
1900 | if (rdev->use_count) { | |
6261b06d | 1901 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1902 | if (ret < 0) { |
9f8df6ad | 1903 | _regulator_put(rdev->supply); |
8e5356a7 | 1904 | rdev->supply = NULL; |
eaa7995c | 1905 | goto out; |
36a1f1b6 | 1906 | } |
6261b06d BA |
1907 | } |
1908 | ||
eaa7995c | 1909 | out: |
eaa7995c | 1910 | return ret; |
6261b06d BA |
1911 | } |
1912 | ||
5ffbd136 | 1913 | /* Internal regulator request function */ |
a8bd42a9 DT |
1914 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1915 | enum regulator_get_type get_type) | |
414c70cb LG |
1916 | { |
1917 | struct regulator_dev *rdev; | |
7d245afa | 1918 | struct regulator *regulator; |
b59b6544 | 1919 | struct device_link *link; |
317b5684 | 1920 | int ret; |
414c70cb | 1921 | |
a8bd42a9 DT |
1922 | if (get_type >= MAX_GET_TYPE) { |
1923 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1924 | return ERR_PTR(-EINVAL); | |
1925 | } | |
1926 | ||
414c70cb | 1927 | if (id == NULL) { |
5da84fd9 | 1928 | pr_err("get() with no identifier\n"); |
043c998f | 1929 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1930 | } |
1931 | ||
163478da | 1932 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1933 | if (IS_ERR(rdev)) { |
1934 | ret = PTR_ERR(rdev); | |
1e4b545c | 1935 | |
a4d7641f DT |
1936 | /* |
1937 | * If regulator_dev_lookup() fails with error other | |
1938 | * than -ENODEV our job here is done, we simply return it. | |
1939 | */ | |
1940 | if (ret != -ENODEV) | |
1941 | return ERR_PTR(ret); | |
34abbd68 | 1942 | |
a4d7641f DT |
1943 | if (!have_full_constraints()) { |
1944 | dev_warn(dev, | |
1945 | "incomplete constraints, dummy supplies not allowed\n"); | |
1946 | return ERR_PTR(-ENODEV); | |
1947 | } | |
4ddfebd3 | 1948 | |
a4d7641f DT |
1949 | switch (get_type) { |
1950 | case NORMAL_GET: | |
1951 | /* | |
1952 | * Assume that a regulator is physically present and | |
1953 | * enabled, even if it isn't hooked up, and just | |
1954 | * provide a dummy. | |
1955 | */ | |
6e5505cf | 1956 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
1957 | rdev = dummy_regulator_rdev; |
1958 | get_device(&rdev->dev); | |
1959 | break; | |
34abbd68 | 1960 | |
a4d7641f DT |
1961 | case EXCLUSIVE_GET: |
1962 | dev_warn(dev, | |
1963 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 1964 | fallthrough; |
34abbd68 | 1965 | |
a4d7641f DT |
1966 | default: |
1967 | return ERR_PTR(-ENODEV); | |
1968 | } | |
34abbd68 | 1969 | } |
34abbd68 | 1970 | |
5ffbd136 MB |
1971 | if (rdev->exclusive) { |
1972 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1973 | put_device(&rdev->dev); |
1974 | return regulator; | |
5ffbd136 MB |
1975 | } |
1976 | ||
a8bd42a9 | 1977 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1978 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1979 | put_device(&rdev->dev); |
1980 | return regulator; | |
5ffbd136 MB |
1981 | } |
1982 | ||
79d6f049 DO |
1983 | mutex_lock(®ulator_list_mutex); |
1984 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1985 | mutex_unlock(®ulator_list_mutex); | |
1986 | ||
1987 | if (ret != 0) { | |
1988 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1989 | put_device(&rdev->dev); | |
1990 | return regulator; | |
1991 | } | |
1992 | ||
6261b06d BA |
1993 | ret = regulator_resolve_supply(rdev); |
1994 | if (ret < 0) { | |
1995 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1996 | put_device(&rdev->dev); |
1997 | return regulator; | |
6261b06d BA |
1998 | } |
1999 | ||
85f3b431 | 2000 | if (!try_module_get(rdev->owner)) { |
7d245afa | 2001 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
2002 | put_device(&rdev->dev); |
2003 | return regulator; | |
2004 | } | |
a5766f11 | 2005 | |
414c70cb LG |
2006 | regulator = create_regulator(rdev, dev, id); |
2007 | if (regulator == NULL) { | |
2008 | regulator = ERR_PTR(-ENOMEM); | |
2009 | module_put(rdev->owner); | |
4affd79a | 2010 | put_device(&rdev->dev); |
85f3b431 | 2011 | return regulator; |
414c70cb LG |
2012 | } |
2013 | ||
5ffbd136 | 2014 | rdev->open_count++; |
a8bd42a9 | 2015 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
2016 | rdev->exclusive = 1; |
2017 | ||
2018 | ret = _regulator_is_enabled(rdev); | |
2019 | if (ret > 0) | |
2020 | rdev->use_count = 1; | |
2021 | else | |
2022 | rdev->use_count = 0; | |
2023 | } | |
2024 | ||
b59b6544 SK |
2025 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
2026 | if (!IS_ERR_OR_NULL(link)) | |
2027 | regulator->device_link = true; | |
ed1ae2dd | 2028 | |
414c70cb LG |
2029 | return regulator; |
2030 | } | |
5ffbd136 MB |
2031 | |
2032 | /** | |
2033 | * regulator_get - lookup and obtain a reference to a regulator. | |
2034 | * @dev: device for regulator "consumer" | |
2035 | * @id: Supply name or regulator ID. | |
2036 | * | |
2037 | * Returns a struct regulator corresponding to the regulator producer, | |
2038 | * or IS_ERR() condition containing errno. | |
2039 | * | |
90cf443d | 2040 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2041 | * strongly encouraged. It is recommended that the supply name used |
2042 | * should match the name used for the supply and/or the relevant | |
2043 | * device pins in the datasheet. | |
2044 | */ | |
2045 | struct regulator *regulator_get(struct device *dev, const char *id) | |
2046 | { | |
a8bd42a9 | 2047 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 2048 | } |
414c70cb LG |
2049 | EXPORT_SYMBOL_GPL(regulator_get); |
2050 | ||
5ffbd136 MB |
2051 | /** |
2052 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
2053 | * @dev: device for regulator "consumer" | |
2054 | * @id: Supply name or regulator ID. | |
2055 | * | |
2056 | * Returns a struct regulator corresponding to the regulator producer, | |
2057 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
2058 | * unable to obtain this regulator while this reference is held and the |
2059 | * use count for the regulator will be initialised to reflect the current | |
2060 | * state of the regulator. | |
5ffbd136 MB |
2061 | * |
2062 | * This is intended for use by consumers which cannot tolerate shared | |
2063 | * use of the regulator such as those which need to force the | |
2064 | * regulator off for correct operation of the hardware they are | |
2065 | * controlling. | |
2066 | * | |
90cf443d | 2067 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2068 | * strongly encouraged. It is recommended that the supply name used |
2069 | * should match the name used for the supply and/or the relevant | |
2070 | * device pins in the datasheet. | |
2071 | */ | |
2072 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2073 | { | |
a8bd42a9 | 2074 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2075 | } |
2076 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2077 | ||
de1dd9fd MB |
2078 | /** |
2079 | * regulator_get_optional - obtain optional access to a regulator. | |
2080 | * @dev: device for regulator "consumer" | |
2081 | * @id: Supply name or regulator ID. | |
2082 | * | |
2083 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2084 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2085 | * |
2086 | * This is intended for use by consumers for devices which can have | |
2087 | * some supplies unconnected in normal use, such as some MMC devices. | |
2088 | * It can allow the regulator core to provide stub supplies for other | |
2089 | * supplies requested using normal regulator_get() calls without | |
2090 | * disrupting the operation of drivers that can handle absent | |
2091 | * supplies. | |
2092 | * | |
90cf443d | 2093 | * Use of supply names configured via set_consumer_device_supply() is |
de1dd9fd MB |
2094 | * strongly encouraged. It is recommended that the supply name used |
2095 | * should match the name used for the supply and/or the relevant | |
2096 | * device pins in the datasheet. | |
2097 | */ | |
2098 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2099 | { | |
a8bd42a9 | 2100 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2101 | } |
2102 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2103 | ||
e1794aa4 | 2104 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2105 | { |
e1794aa4 | 2106 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2107 | |
5de70519 | 2108 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2109 | |
ed1ae2dd | 2110 | if (regulator->dev) { |
b59b6544 SK |
2111 | if (regulator->device_link) |
2112 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2113 | |
2114 | /* remove any sysfs entries */ | |
414c70cb | 2115 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2116 | } |
2117 | ||
66cf9a7e | 2118 | regulator_lock(rdev); |
414c70cb | 2119 | list_del(®ulator->list); |
414c70cb | 2120 | |
5ffbd136 MB |
2121 | rdev->open_count--; |
2122 | rdev->exclusive = 0; | |
66cf9a7e | 2123 | regulator_unlock(rdev); |
5ffbd136 | 2124 | |
0630b614 | 2125 | kfree_const(regulator->supply_name); |
1768514e | 2126 | kfree(regulator); |
e1794aa4 SK |
2127 | } |
2128 | ||
2129 | /* regulator_list_mutex lock held by regulator_put() */ | |
2130 | static void _regulator_put(struct regulator *regulator) | |
2131 | { | |
2132 | struct regulator_dev *rdev; | |
2133 | ||
2134 | if (IS_ERR_OR_NULL(regulator)) | |
2135 | return; | |
2136 | ||
2137 | lockdep_assert_held_once(®ulator_list_mutex); | |
2138 | ||
2139 | /* Docs say you must disable before calling regulator_put() */ | |
2140 | WARN_ON(regulator->enable_count); | |
2141 | ||
2142 | rdev = regulator->rdev; | |
2143 | ||
2144 | destroy_regulator(regulator); | |
1768514e | 2145 | |
414c70cb | 2146 | module_put(rdev->owner); |
4affd79a | 2147 | put_device(&rdev->dev); |
23ff2f0f CK |
2148 | } |
2149 | ||
2150 | /** | |
2151 | * regulator_put - "free" the regulator source | |
2152 | * @regulator: regulator source | |
2153 | * | |
2154 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2155 | * regulator source are balanced by regulator_disable calls prior to calling | |
2156 | * this function. | |
2157 | */ | |
2158 | void regulator_put(struct regulator *regulator) | |
2159 | { | |
2160 | mutex_lock(®ulator_list_mutex); | |
2161 | _regulator_put(regulator); | |
414c70cb LG |
2162 | mutex_unlock(®ulator_list_mutex); |
2163 | } | |
2164 | EXPORT_SYMBOL_GPL(regulator_put); | |
2165 | ||
a06ccd9c CK |
2166 | /** |
2167 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2168 | * | |
2169 | * @dev: device that will be given as the regulator "consumer" | |
2170 | * @id: Supply name or regulator ID | |
2171 | * @alias_dev: device that should be used to lookup the supply | |
2172 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2173 | * supply | |
2174 | * | |
2175 | * All lookups for id on dev will instead be conducted for alias_id on | |
2176 | * alias_dev. | |
2177 | */ | |
2178 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2179 | struct device *alias_dev, | |
2180 | const char *alias_id) | |
2181 | { | |
2182 | struct regulator_supply_alias *map; | |
2183 | ||
2184 | map = regulator_find_supply_alias(dev, id); | |
2185 | if (map) | |
2186 | return -EEXIST; | |
2187 | ||
2188 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2189 | if (!map) | |
2190 | return -ENOMEM; | |
2191 | ||
2192 | map->src_dev = dev; | |
2193 | map->src_supply = id; | |
2194 | map->alias_dev = alias_dev; | |
2195 | map->alias_supply = alias_id; | |
2196 | ||
2197 | list_add(&map->list, ®ulator_supply_alias_list); | |
2198 | ||
2199 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2200 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2201 | ||
2202 | return 0; | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2205 | ||
2206 | /** | |
2207 | * regulator_unregister_supply_alias - Remove device alias | |
2208 | * | |
2209 | * @dev: device that will be given as the regulator "consumer" | |
2210 | * @id: Supply name or regulator ID | |
2211 | * | |
2212 | * Remove a lookup alias if one exists for id on dev. | |
2213 | */ | |
2214 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2215 | { | |
2216 | struct regulator_supply_alias *map; | |
2217 | ||
2218 | map = regulator_find_supply_alias(dev, id); | |
2219 | if (map) { | |
2220 | list_del(&map->list); | |
2221 | kfree(map); | |
2222 | } | |
2223 | } | |
2224 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2225 | ||
2226 | /** | |
2227 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2228 | * | |
2229 | * @dev: device that will be given as the regulator "consumer" | |
2230 | * @id: List of supply names or regulator IDs | |
2231 | * @alias_dev: device that should be used to lookup the supply | |
2232 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2233 | * lookup the supply | |
2234 | * @num_id: Number of aliases to register | |
2235 | * | |
2236 | * @return 0 on success, an errno on failure. | |
2237 | * | |
2238 | * This helper function allows drivers to register several supply | |
2239 | * aliases in one operation. If any of the aliases cannot be | |
2240 | * registered any aliases that were registered will be removed | |
2241 | * before returning to the caller. | |
2242 | */ | |
9f8c0fe9 LJ |
2243 | int regulator_bulk_register_supply_alias(struct device *dev, |
2244 | const char *const *id, | |
a06ccd9c | 2245 | struct device *alias_dev, |
9f8c0fe9 | 2246 | const char *const *alias_id, |
a06ccd9c CK |
2247 | int num_id) |
2248 | { | |
2249 | int i; | |
2250 | int ret; | |
2251 | ||
2252 | for (i = 0; i < num_id; ++i) { | |
2253 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2254 | alias_id[i]); | |
2255 | if (ret < 0) | |
2256 | goto err; | |
2257 | } | |
2258 | ||
2259 | return 0; | |
2260 | ||
2261 | err: | |
2262 | dev_err(dev, | |
2263 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2264 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2265 | ||
2266 | while (--i >= 0) | |
2267 | regulator_unregister_supply_alias(dev, id[i]); | |
2268 | ||
2269 | return ret; | |
2270 | } | |
2271 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2272 | ||
2273 | /** | |
2274 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2275 | * | |
2276 | * @dev: device that will be given as the regulator "consumer" | |
2277 | * @id: List of supply names or regulator IDs | |
2278 | * @num_id: Number of aliases to unregister | |
2279 | * | |
2280 | * This helper function allows drivers to unregister several supply | |
2281 | * aliases in one operation. | |
2282 | */ | |
2283 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2284 | const char *const *id, |
a06ccd9c CK |
2285 | int num_id) |
2286 | { | |
2287 | int i; | |
2288 | ||
2289 | for (i = 0; i < num_id; ++i) | |
2290 | regulator_unregister_supply_alias(dev, id[i]); | |
2291 | } | |
2292 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2293 | ||
2294 | ||
f19b00da KM |
2295 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2296 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2297 | const struct regulator_config *config) | |
2298 | { | |
467bf301 | 2299 | struct regulator_enable_gpio *pin, *new_pin; |
778b28b4 | 2300 | struct gpio_desc *gpiod; |
f19b00da | 2301 | |
541d052d | 2302 | gpiod = config->ena_gpiod; |
467bf301 MM |
2303 | new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL); |
2304 | ||
2305 | mutex_lock(®ulator_list_mutex); | |
778b28b4 | 2306 | |
f19b00da | 2307 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2308 | if (pin->gpiod == gpiod) { |
541d052d | 2309 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2310 | goto update_ena_gpio_to_rdev; |
2311 | } | |
2312 | } | |
2313 | ||
467bf301 MM |
2314 | if (new_pin == NULL) { |
2315 | mutex_unlock(®ulator_list_mutex); | |
f19b00da | 2316 | return -ENOMEM; |
467bf301 MM |
2317 | } |
2318 | ||
2319 | pin = new_pin; | |
2320 | new_pin = NULL; | |
f19b00da | 2321 | |
778b28b4 | 2322 | pin->gpiod = gpiod; |
f19b00da KM |
2323 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2324 | ||
2325 | update_ena_gpio_to_rdev: | |
2326 | pin->request_count++; | |
2327 | rdev->ena_pin = pin; | |
467bf301 MM |
2328 | |
2329 | mutex_unlock(®ulator_list_mutex); | |
2330 | kfree(new_pin); | |
2331 | ||
f19b00da KM |
2332 | return 0; |
2333 | } | |
2334 | ||
2335 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2336 | { | |
2337 | struct regulator_enable_gpio *pin, *n; | |
2338 | ||
2339 | if (!rdev->ena_pin) | |
2340 | return; | |
2341 | ||
2342 | /* Free the GPIO only in case of no use */ | |
2343 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
2dbf0855 MM |
2344 | if (pin != rdev->ena_pin) |
2345 | continue; | |
2346 | ||
2347 | if (--pin->request_count) | |
2348 | break; | |
2349 | ||
2350 | gpiod_put(pin->gpiod); | |
2351 | list_del(&pin->list); | |
2352 | kfree(pin); | |
2353 | break; | |
f19b00da | 2354 | } |
2dbf0855 MM |
2355 | |
2356 | rdev->ena_pin = NULL; | |
f19b00da KM |
2357 | } |
2358 | ||
967cfb18 | 2359 | /** |
31d6eebf RD |
2360 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2361 | * @rdev: regulator_dev structure | |
2362 | * @enable: enable GPIO at initial use? | |
2363 | * | |
967cfb18 KM |
2364 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2365 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2366 | */ | |
2367 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2368 | { | |
2369 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2370 | ||
2371 | if (!pin) | |
2372 | return -EINVAL; | |
2373 | ||
2374 | if (enable) { | |
2375 | /* Enable GPIO at initial use */ | |
2376 | if (pin->enable_count == 0) | |
01dc79cd | 2377 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2378 | |
2379 | pin->enable_count++; | |
2380 | } else { | |
2381 | if (pin->enable_count > 1) { | |
2382 | pin->enable_count--; | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | /* Disable GPIO if not used */ | |
2387 | if (pin->enable_count <= 1) { | |
01dc79cd | 2388 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2389 | pin->enable_count = 0; |
2390 | } | |
2391 | } | |
2392 | ||
2393 | return 0; | |
2394 | } | |
2395 | ||
79fd1141 GX |
2396 | /** |
2397 | * _regulator_enable_delay - a delay helper function | |
2398 | * @delay: time to delay in microseconds | |
2399 | * | |
2400 | * Delay for the requested amount of time as per the guidelines in: | |
2401 | * | |
458f69ef | 2402 | * Documentation/timers/timers-howto.rst |
79fd1141 GX |
2403 | * |
2404 | * The assumption here is that regulators will never be enabled in | |
2405 | * atomic context and therefore sleeping functions can be used. | |
2406 | */ | |
2407 | static void _regulator_enable_delay(unsigned int delay) | |
2408 | { | |
2409 | unsigned int ms = delay / 1000; | |
2410 | unsigned int us = delay % 1000; | |
2411 | ||
2412 | if (ms > 0) { | |
2413 | /* | |
2414 | * For small enough values, handle super-millisecond | |
2415 | * delays in the usleep_range() call below. | |
2416 | */ | |
2417 | if (ms < 20) | |
2418 | us += ms * 1000; | |
2419 | else | |
2420 | msleep(ms); | |
2421 | } | |
2422 | ||
2423 | /* | |
2424 | * Give the scheduler some room to coalesce with any other | |
2425 | * wakeup sources. For delays shorter than 10 us, don't even | |
2426 | * bother setting up high-resolution timers and just busy- | |
2427 | * loop. | |
2428 | */ | |
2429 | if (us >= 10) | |
2430 | usleep_range(us, us + 100); | |
2431 | else | |
2432 | udelay(us); | |
2433 | } | |
2434 | ||
f7d7ad42 SS |
2435 | /** |
2436 | * _regulator_check_status_enabled | |
2437 | * | |
2438 | * A helper function to check if the regulator status can be interpreted | |
2439 | * as 'regulator is enabled'. | |
2440 | * @rdev: the regulator device to check | |
2441 | * | |
2442 | * Return: | |
2443 | * * 1 - if status shows regulator is in enabled state | |
2444 | * * 0 - if not enabled state | |
2445 | * * Error Value - as received from ops->get_status() | |
2446 | */ | |
2447 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2448 | { | |
2449 | int ret = rdev->desc->ops->get_status(rdev); | |
2450 | ||
2451 | if (ret < 0) { | |
2452 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2453 | return ret; | |
2454 | } | |
2455 | ||
2456 | switch (ret) { | |
2457 | case REGULATOR_STATUS_OFF: | |
2458 | case REGULATOR_STATUS_ERROR: | |
2459 | case REGULATOR_STATUS_UNDEFINED: | |
2460 | return 0; | |
2461 | default: | |
2462 | return 1; | |
2463 | } | |
2464 | } | |
2465 | ||
5c5659d0 MB |
2466 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2467 | { | |
2468 | int ret, delay; | |
2469 | ||
2470 | /* Query before enabling in case configuration dependent. */ | |
2471 | ret = _regulator_get_enable_time(rdev); | |
2472 | if (ret >= 0) { | |
2473 | delay = ret; | |
2474 | } else { | |
61aab5ad | 2475 | rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret)); |
5c5659d0 MB |
2476 | delay = 0; |
2477 | } | |
2478 | ||
2479 | trace_regulator_enable(rdev_get_name(rdev)); | |
2480 | ||
a8ce7bd8 | 2481 | if (rdev->desc->off_on_delay && rdev->last_off) { |
871f5650 GX |
2482 | /* if needed, keep a distance of off_on_delay from last time |
2483 | * this regulator was disabled. | |
2484 | */ | |
a8ce7bd8 VW |
2485 | ktime_t end = ktime_add_us(rdev->last_off, rdev->desc->off_on_delay); |
2486 | s64 remaining = ktime_us_delta(end, ktime_get()); | |
2487 | ||
2488 | if (remaining > 0) | |
2489 | _regulator_enable_delay(remaining); | |
871f5650 GX |
2490 | } |
2491 | ||
967cfb18 | 2492 | if (rdev->ena_pin) { |
29d62ec5 DA |
2493 | if (!rdev->ena_gpio_state) { |
2494 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2495 | if (ret < 0) | |
2496 | return ret; | |
2497 | rdev->ena_gpio_state = 1; | |
2498 | } | |
65f73508 | 2499 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2500 | ret = rdev->desc->ops->enable(rdev); |
2501 | if (ret < 0) | |
2502 | return ret; | |
2503 | } else { | |
2504 | return -EINVAL; | |
2505 | } | |
2506 | ||
2507 | /* Allow the regulator to ramp; it would be useful to extend | |
2508 | * this for bulk operations so that the regulators can ramp | |
69b8821e SK |
2509 | * together. |
2510 | */ | |
5c5659d0 MB |
2511 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
2512 | ||
f7d7ad42 SS |
2513 | /* If poll_enabled_time is set, poll upto the delay calculated |
2514 | * above, delaying poll_enabled_time uS to check if the regulator | |
2515 | * actually got enabled. | |
2516 | * If the regulator isn't enabled after enable_delay has | |
2517 | * expired, return -ETIMEDOUT. | |
2518 | */ | |
2519 | if (rdev->desc->poll_enabled_time) { | |
2520 | unsigned int time_remaining = delay; | |
2521 | ||
2522 | while (time_remaining > 0) { | |
2523 | _regulator_enable_delay(rdev->desc->poll_enabled_time); | |
2524 | ||
2525 | if (rdev->desc->ops->get_status) { | |
2526 | ret = _regulator_check_status_enabled(rdev); | |
2527 | if (ret < 0) | |
2528 | return ret; | |
2529 | else if (ret) | |
2530 | break; | |
2531 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2532 | break; | |
2533 | ||
2534 | time_remaining -= rdev->desc->poll_enabled_time; | |
2535 | } | |
2536 | ||
2537 | if (time_remaining <= 0) { | |
2538 | rdev_err(rdev, "Enabled check timed out\n"); | |
2539 | return -ETIMEDOUT; | |
2540 | } | |
2541 | } else { | |
2542 | _regulator_enable_delay(delay); | |
2543 | } | |
5c5659d0 MB |
2544 | |
2545 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2546 | ||
2547 | return 0; | |
2548 | } | |
2549 | ||
5451781d DA |
2550 | /** |
2551 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2552 | * @regulator: regulator source | |
2553 | * | |
2554 | * Some things on a regulator consumer (like the contribution towards total | |
2555 | * load on the regulator) only have an effect when the consumer wants the | |
2556 | * regulator enabled. Explained in example with two consumers of the same | |
2557 | * regulator: | |
2558 | * consumer A: set_load(100); => total load = 0 | |
2559 | * consumer A: regulator_enable(); => total load = 100 | |
2560 | * consumer B: set_load(1000); => total load = 100 | |
2561 | * consumer B: regulator_enable(); => total load = 1100 | |
2562 | * consumer A: regulator_disable(); => total_load = 1000 | |
2563 | * | |
2564 | * This function (together with _regulator_handle_consumer_disable) is | |
2565 | * responsible for keeping track of the refcount for a given regulator consumer | |
2566 | * and applying / unapplying these things. | |
2567 | * | |
2568 | * Returns 0 upon no error; -error upon error. | |
2569 | */ | |
2570 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2571 | { | |
2572 | struct regulator_dev *rdev = regulator->rdev; | |
2573 | ||
2574 | lockdep_assert_held_once(&rdev->mutex.base); | |
2575 | ||
2576 | regulator->enable_count++; | |
2577 | if (regulator->uA_load && regulator->enable_count == 1) | |
2578 | return drms_uA_update(rdev); | |
2579 | ||
2580 | return 0; | |
2581 | } | |
2582 | ||
2583 | /** | |
2584 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2585 | * @regulator: regulator source | |
2586 | * | |
2587 | * The opposite of _regulator_handle_consumer_enable(). | |
2588 | * | |
2589 | * Returns 0 upon no error; -error upon error. | |
2590 | */ | |
2591 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2592 | { | |
2593 | struct regulator_dev *rdev = regulator->rdev; | |
2594 | ||
2595 | lockdep_assert_held_once(&rdev->mutex.base); | |
2596 | ||
2597 | if (!regulator->enable_count) { | |
2598 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2599 | return -EINVAL; | |
2600 | } | |
2601 | ||
2602 | regulator->enable_count--; | |
2603 | if (regulator->uA_load && regulator->enable_count == 0) | |
2604 | return drms_uA_update(rdev); | |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
414c70cb | 2609 | /* locks held by regulator_enable() */ |
5451781d | 2610 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2611 | { |
5451781d | 2612 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2613 | int ret; |
414c70cb | 2614 | |
f8702f9e DO |
2615 | lockdep_assert_held_once(&rdev->mutex.base); |
2616 | ||
1fc12b05 | 2617 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2618 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2619 | if (ret < 0) |
2620 | return ret; | |
2621 | } | |
2622 | ||
2623 | /* balance only if there are regulators coupled */ | |
2624 | if (rdev->coupling_desc.n_coupled > 1) { | |
2625 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2626 | if (ret < 0) | |
2627 | goto err_disable_supply; | |
2628 | } | |
70cfef26 | 2629 | |
5451781d DA |
2630 | ret = _regulator_handle_consumer_enable(regulator); |
2631 | if (ret < 0) | |
2632 | goto err_disable_supply; | |
414c70cb | 2633 | |
9a2372fa | 2634 | if (rdev->use_count == 0) { |
72241e31 SF |
2635 | /* |
2636 | * The regulator may already be enabled if it's not switchable | |
2637 | * or was left on | |
2638 | */ | |
9a2372fa MB |
2639 | ret = _regulator_is_enabled(rdev); |
2640 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2641 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2642 | REGULATOR_CHANGE_STATUS)) { |
2643 | ret = -EPERM; | |
5451781d | 2644 | goto err_consumer_disable; |
f8702f9e | 2645 | } |
9a2372fa | 2646 | |
5c5659d0 | 2647 | ret = _regulator_do_enable(rdev); |
31aae2be | 2648 | if (ret < 0) |
5451781d | 2649 | goto err_consumer_disable; |
31aae2be | 2650 | |
264b88c9 HG |
2651 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2652 | NULL); | |
a7433cff | 2653 | } else if (ret < 0) { |
61aab5ad | 2654 | rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret)); |
5451781d | 2655 | goto err_consumer_disable; |
414c70cb | 2656 | } |
a7433cff | 2657 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2658 | } |
2659 | ||
9a2372fa MB |
2660 | rdev->use_count++; |
2661 | ||
2662 | return 0; | |
f8702f9e | 2663 | |
5451781d DA |
2664 | err_consumer_disable: |
2665 | _regulator_handle_consumer_disable(regulator); | |
2666 | ||
f8702f9e | 2667 | err_disable_supply: |
1fc12b05 | 2668 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2669 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2670 | |
2671 | return ret; | |
414c70cb LG |
2672 | } |
2673 | ||
2674 | /** | |
2675 | * regulator_enable - enable regulator output | |
2676 | * @regulator: regulator source | |
2677 | * | |
cf7bbcdf MB |
2678 | * Request that the regulator be enabled with the regulator output at |
2679 | * the predefined voltage or current value. Calls to regulator_enable() | |
2680 | * must be balanced with calls to regulator_disable(). | |
2681 | * | |
414c70cb | 2682 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2683 | * hardwired in the regulator. |
414c70cb LG |
2684 | */ |
2685 | int regulator_enable(struct regulator *regulator) | |
2686 | { | |
412aec61 | 2687 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2688 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2689 | int ret; |
6492bc1b | 2690 | |
f8702f9e | 2691 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2692 | ret = _regulator_enable(regulator); |
f8702f9e | 2693 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2694 | |
414c70cb LG |
2695 | return ret; |
2696 | } | |
2697 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2698 | ||
5c5659d0 MB |
2699 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2700 | { | |
2701 | int ret; | |
2702 | ||
2703 | trace_regulator_disable(rdev_get_name(rdev)); | |
2704 | ||
967cfb18 | 2705 | if (rdev->ena_pin) { |
29d62ec5 DA |
2706 | if (rdev->ena_gpio_state) { |
2707 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2708 | if (ret < 0) | |
2709 | return ret; | |
2710 | rdev->ena_gpio_state = 0; | |
2711 | } | |
5c5659d0 MB |
2712 | |
2713 | } else if (rdev->desc->ops->disable) { | |
2714 | ret = rdev->desc->ops->disable(rdev); | |
2715 | if (ret != 0) | |
2716 | return ret; | |
2717 | } | |
2718 | ||
871f5650 | 2719 | if (rdev->desc->off_on_delay) |
a8ce7bd8 | 2720 | rdev->last_off = ktime_get(); |
871f5650 | 2721 | |
5c5659d0 MB |
2722 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2723 | ||
5c5659d0 MB |
2724 | return 0; |
2725 | } | |
2726 | ||
414c70cb | 2727 | /* locks held by regulator_disable() */ |
5451781d | 2728 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2729 | { |
5451781d | 2730 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2731 | int ret = 0; |
2732 | ||
f8702f9e | 2733 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2734 | |
cd94b505 | 2735 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2736 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2737 | return -EIO; |
2738 | ||
414c70cb | 2739 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2740 | if (rdev->use_count == 1 && |
2741 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2742 | |
2743 | /* we are last user */ | |
8a34e979 | 2744 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2745 | ret = _notifier_call_chain(rdev, |
2746 | REGULATOR_EVENT_PRE_DISABLE, | |
2747 | NULL); | |
2748 | if (ret & NOTIFY_STOP_MASK) | |
2749 | return -EINVAL; | |
2750 | ||
5c5659d0 | 2751 | ret = _regulator_do_disable(rdev); |
414c70cb | 2752 | if (ret < 0) { |
61aab5ad | 2753 | rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2754 | _notifier_call_chain(rdev, |
2755 | REGULATOR_EVENT_ABORT_DISABLE, | |
2756 | NULL); | |
414c70cb LG |
2757 | return ret; |
2758 | } | |
66fda75f MP |
2759 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2760 | NULL); | |
414c70cb LG |
2761 | } |
2762 | ||
414c70cb LG |
2763 | rdev->use_count = 0; |
2764 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2765 | rdev->use_count--; |
2766 | } | |
3801b86a | 2767 | |
5451781d DA |
2768 | if (ret == 0) |
2769 | ret = _regulator_handle_consumer_disable(regulator); | |
2770 | ||
f8702f9e DO |
2771 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2772 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2773 | ||
1fc12b05 | 2774 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2775 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2776 | |
414c70cb LG |
2777 | return ret; |
2778 | } | |
2779 | ||
2780 | /** | |
2781 | * regulator_disable - disable regulator output | |
2782 | * @regulator: regulator source | |
2783 | * | |
cf7bbcdf MB |
2784 | * Disable the regulator output voltage or current. Calls to |
2785 | * regulator_enable() must be balanced with calls to | |
2786 | * regulator_disable(). | |
69279fb9 | 2787 | * |
414c70cb | 2788 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2789 | * devices have it enabled, the regulator device supports disabling and |
2790 | * machine constraints permit this operation. | |
414c70cb LG |
2791 | */ |
2792 | int regulator_disable(struct regulator *regulator) | |
2793 | { | |
412aec61 | 2794 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2795 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2796 | int ret; |
6492bc1b | 2797 | |
f8702f9e | 2798 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2799 | ret = _regulator_disable(regulator); |
f8702f9e | 2800 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2801 | |
414c70cb LG |
2802 | return ret; |
2803 | } | |
2804 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2805 | ||
2806 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2807 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2808 | { |
2809 | int ret = 0; | |
2810 | ||
f8702f9e | 2811 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2812 | |
a1c8a551 RF |
2813 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2814 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2815 | if (ret & NOTIFY_STOP_MASK) | |
2816 | return -EINVAL; | |
2817 | ||
66fda75f MP |
2818 | ret = _regulator_do_disable(rdev); |
2819 | if (ret < 0) { | |
61aab5ad | 2820 | rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2821 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2822 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2823 | return ret; |
414c70cb LG |
2824 | } |
2825 | ||
66fda75f MP |
2826 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2827 | REGULATOR_EVENT_DISABLE, NULL); | |
2828 | ||
2829 | return 0; | |
414c70cb LG |
2830 | } |
2831 | ||
2832 | /** | |
2833 | * regulator_force_disable - force disable regulator output | |
2834 | * @regulator: regulator source | |
2835 | * | |
2836 | * Forcibly disable the regulator output voltage or current. | |
2837 | * NOTE: this *will* disable the regulator output even if other consumer | |
2838 | * devices have it enabled. This should be used for situations when device | |
2839 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2840 | */ | |
2841 | int regulator_force_disable(struct regulator *regulator) | |
2842 | { | |
82d15839 | 2843 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2844 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2845 | int ret; |
2846 | ||
f8702f9e | 2847 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2848 | |
3801b86a | 2849 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2850 | |
9243a195 MP |
2851 | if (rdev->coupling_desc.n_coupled > 1) |
2852 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2853 | |
2854 | if (regulator->uA_load) { | |
2855 | regulator->uA_load = 0; | |
2856 | ret = drms_uA_update(rdev); | |
2857 | } | |
2858 | ||
1fc12b05 DA |
2859 | if (rdev->use_count != 0 && rdev->supply) |
2860 | _regulator_disable(rdev->supply); | |
8cbf811d | 2861 | |
1fc12b05 | 2862 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2863 | |
414c70cb LG |
2864 | return ret; |
2865 | } | |
2866 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2867 | ||
da07ecd9 MB |
2868 | static void regulator_disable_work(struct work_struct *work) |
2869 | { | |
2870 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2871 | disable_work.work); | |
f8702f9e | 2872 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2873 | int count, i, ret; |
5451781d DA |
2874 | struct regulator *regulator; |
2875 | int total_count = 0; | |
da07ecd9 | 2876 | |
f8702f9e | 2877 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2878 | |
c9ccaa0c TR |
2879 | /* |
2880 | * Workqueue functions queue the new work instance while the previous | |
2881 | * work instance is being processed. Cancel the queued work instance | |
2882 | * as the work instance under processing does the job of the queued | |
2883 | * work instance. | |
2884 | */ | |
2885 | cancel_delayed_work(&rdev->disable_work); | |
2886 | ||
5451781d DA |
2887 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2888 | count = regulator->deferred_disables; | |
2889 | ||
2890 | if (!count) | |
2891 | continue; | |
2892 | ||
2893 | total_count += count; | |
2894 | regulator->deferred_disables = 0; | |
2895 | ||
2896 | for (i = 0; i < count; i++) { | |
2897 | ret = _regulator_disable(regulator); | |
2898 | if (ret != 0) | |
61aab5ad MM |
2899 | rdev_err(rdev, "Deferred disable failed: %pe\n", |
2900 | ERR_PTR(ret)); | |
5451781d | 2901 | } |
da07ecd9 | 2902 | } |
5451781d | 2903 | WARN_ON(!total_count); |
da07ecd9 | 2904 | |
f8702f9e DO |
2905 | if (rdev->coupling_desc.n_coupled > 1) |
2906 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2907 | ||
2908 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2909 | } |
2910 | ||
2911 | /** | |
2912 | * regulator_disable_deferred - disable regulator output with delay | |
2913 | * @regulator: regulator source | |
48f1b4ef | 2914 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
2915 | * |
2916 | * Execute regulator_disable() on the regulator after a delay. This | |
2917 | * is intended for use with devices that require some time to quiesce. | |
2918 | * | |
2919 | * NOTE: this will only disable the regulator output if no other consumer | |
2920 | * devices have it enabled, the regulator device supports disabling and | |
2921 | * machine constraints permit this operation. | |
2922 | */ | |
2923 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2924 | { | |
2925 | struct regulator_dev *rdev = regulator->rdev; | |
2926 | ||
2b5a24a0 MB |
2927 | if (!ms) |
2928 | return regulator_disable(regulator); | |
2929 | ||
66cf9a7e | 2930 | regulator_lock(rdev); |
5451781d | 2931 | regulator->deferred_disables++; |
c9ccaa0c TR |
2932 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2933 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2934 | regulator_unlock(rdev); |
da07ecd9 | 2935 | |
70dc6daf | 2936 | return 0; |
da07ecd9 MB |
2937 | } |
2938 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2939 | ||
414c70cb LG |
2940 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2941 | { | |
65f73508 | 2942 | /* A GPIO control always takes precedence */ |
7b74d149 | 2943 | if (rdev->ena_pin) |
65f73508 MB |
2944 | return rdev->ena_gpio_state; |
2945 | ||
9a7f6a4c | 2946 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2947 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2948 | return 1; |
414c70cb | 2949 | |
9332546f | 2950 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2951 | } |
2952 | ||
3d67fe95 MP |
2953 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2954 | unsigned selector, int lock) | |
3a40cfc3 | 2955 | { |
3a40cfc3 SH |
2956 | const struct regulator_ops *ops = rdev->desc->ops; |
2957 | int ret; | |
2958 | ||
2959 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2960 | return rdev->desc->fixed_uV; | |
2961 | ||
2962 | if (ops->list_voltage) { | |
2963 | if (selector >= rdev->desc->n_voltages) | |
2964 | return -EINVAL; | |
55cca739 CB |
2965 | if (selector < rdev->desc->linear_min_sel) |
2966 | return 0; | |
3a40cfc3 | 2967 | if (lock) |
66cf9a7e | 2968 | regulator_lock(rdev); |
3a40cfc3 SH |
2969 | ret = ops->list_voltage(rdev, selector); |
2970 | if (lock) | |
66cf9a7e | 2971 | regulator_unlock(rdev); |
fd086045 | 2972 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2973 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2974 | selector, lock); | |
3a40cfc3 SH |
2975 | } else { |
2976 | return -EINVAL; | |
2977 | } | |
2978 | ||
2979 | if (ret > 0) { | |
2980 | if (ret < rdev->constraints->min_uV) | |
2981 | ret = 0; | |
2982 | else if (ret > rdev->constraints->max_uV) | |
2983 | ret = 0; | |
2984 | } | |
2985 | ||
2986 | return ret; | |
2987 | } | |
2988 | ||
414c70cb LG |
2989 | /** |
2990 | * regulator_is_enabled - is the regulator output enabled | |
2991 | * @regulator: regulator source | |
2992 | * | |
412aec61 DB |
2993 | * Returns positive if the regulator driver backing the source/client |
2994 | * has requested that the device be enabled, zero if it hasn't, else a | |
2995 | * negative errno code. | |
2996 | * | |
2997 | * Note that the device backing this regulator handle can have multiple | |
2998 | * users, so it might be enabled even if regulator_enable() was never | |
2999 | * called for this particular source. | |
414c70cb LG |
3000 | */ |
3001 | int regulator_is_enabled(struct regulator *regulator) | |
3002 | { | |
9332546f MB |
3003 | int ret; |
3004 | ||
6492bc1b MB |
3005 | if (regulator->always_on) |
3006 | return 1; | |
3007 | ||
f8702f9e | 3008 | regulator_lock(regulator->rdev); |
9332546f | 3009 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 3010 | regulator_unlock(regulator->rdev); |
9332546f MB |
3011 | |
3012 | return ret; | |
414c70cb LG |
3013 | } |
3014 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
3015 | ||
4367cfdc DB |
3016 | /** |
3017 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
3018 | * @regulator: regulator source | |
3019 | * | |
3020 | * Returns number of selectors, or negative errno. Selectors are | |
3021 | * numbered starting at zero, and typically correspond to bitfields | |
3022 | * in hardware registers. | |
3023 | */ | |
3024 | int regulator_count_voltages(struct regulator *regulator) | |
3025 | { | |
3026 | struct regulator_dev *rdev = regulator->rdev; | |
3027 | ||
26988efe JMC |
3028 | if (rdev->desc->n_voltages) |
3029 | return rdev->desc->n_voltages; | |
3030 | ||
fd086045 | 3031 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
3032 | return -EINVAL; |
3033 | ||
3034 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
3035 | } |
3036 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
3037 | ||
3038 | /** | |
3039 | * regulator_list_voltage - enumerate supported voltages | |
3040 | * @regulator: regulator source | |
3041 | * @selector: identify voltage to list | |
3042 | * Context: can sleep | |
3043 | * | |
3044 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 3045 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
3046 | * negative errno. |
3047 | */ | |
3048 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
3049 | { | |
3d67fe95 | 3050 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
3051 | } |
3052 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
3053 | ||
04eca28c TT |
3054 | /** |
3055 | * regulator_get_regmap - get the regulator's register map | |
3056 | * @regulator: regulator source | |
3057 | * | |
3058 | * Returns the register map for the given regulator, or an ERR_PTR value | |
3059 | * if the regulator doesn't use regmap. | |
3060 | */ | |
3061 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
3062 | { | |
3063 | struct regmap *map = regulator->rdev->regmap; | |
3064 | ||
3065 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
3066 | } | |
3067 | ||
3068 | /** | |
3069 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3070 | * @regulator: regulator source | |
3071 | * @vsel_reg: voltage selector register, output parameter | |
3072 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3073 | * | |
3074 | * Returns the hardware register offset and bitmask used for setting the | |
3075 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3076 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3077 | * for example. | |
3078 | * | |
3079 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3080 | * and 0 is returned, otherwise a negative errno is returned. | |
3081 | */ | |
3082 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3083 | unsigned *vsel_reg, | |
3084 | unsigned *vsel_mask) | |
3085 | { | |
39f5460d GX |
3086 | struct regulator_dev *rdev = regulator->rdev; |
3087 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3088 | |
3089 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3090 | return -EOPNOTSUPP; | |
3091 | ||
0d5c8633 CIK |
3092 | *vsel_reg = rdev->desc->vsel_reg; |
3093 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c | 3094 | |
be35cc46 | 3095 | return 0; |
04eca28c TT |
3096 | } |
3097 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3098 | ||
3099 | /** | |
3100 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3101 | * @regulator: regulator source | |
3102 | * @selector: identify voltage to list | |
3103 | * | |
3104 | * Converts the selector to a hardware-specific voltage selector that can be | |
3105 | * directly written to the regulator registers. The address of the voltage | |
3106 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3107 | * | |
3108 | * On error a negative errno is returned. | |
3109 | */ | |
3110 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3111 | unsigned selector) | |
3112 | { | |
39f5460d GX |
3113 | struct regulator_dev *rdev = regulator->rdev; |
3114 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3115 | |
3116 | if (selector >= rdev->desc->n_voltages) | |
3117 | return -EINVAL; | |
55cca739 CB |
3118 | if (selector < rdev->desc->linear_min_sel) |
3119 | return 0; | |
04eca28c TT |
3120 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) |
3121 | return -EOPNOTSUPP; | |
3122 | ||
3123 | return selector; | |
3124 | } | |
3125 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3126 | ||
2a668a8b PW |
3127 | /** |
3128 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3129 | * @regulator: regulator source | |
3130 | * | |
3131 | * Returns the voltage step size between VSEL values for linear | |
3132 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3133 | */ | |
3134 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3135 | { | |
3136 | struct regulator_dev *rdev = regulator->rdev; | |
3137 | ||
3138 | return rdev->desc->uV_step; | |
3139 | } | |
3140 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3141 | ||
a7a1ad90 MB |
3142 | /** |
3143 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3144 | * | |
3145 | * @regulator: Regulator to check. | |
3146 | * @min_uV: Minimum required voltage in uV. | |
3147 | * @max_uV: Maximum required voltage in uV. | |
3148 | * | |
49820944 | 3149 | * Returns a boolean. |
a7a1ad90 MB |
3150 | */ |
3151 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3152 | int min_uV, int max_uV) | |
3153 | { | |
c5f3939b | 3154 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3155 | int i, voltages, ret; |
3156 | ||
c5f3939b | 3157 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3158 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3159 | ret = regulator_get_voltage(regulator); |
3160 | if (ret >= 0) | |
0d25d09d | 3161 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3162 | else |
3163 | return ret; | |
3164 | } | |
3165 | ||
bd7a2b60 PM |
3166 | /* Any voltage within constrains range is fine? */ |
3167 | if (rdev->desc->continuous_voltage_range) | |
3168 | return min_uV >= rdev->constraints->min_uV && | |
3169 | max_uV <= rdev->constraints->max_uV; | |
3170 | ||
a7a1ad90 MB |
3171 | ret = regulator_count_voltages(regulator); |
3172 | if (ret < 0) | |
49820944 | 3173 | return 0; |
a7a1ad90 MB |
3174 | voltages = ret; |
3175 | ||
3176 | for (i = 0; i < voltages; i++) { | |
3177 | ret = regulator_list_voltage(regulator, i); | |
3178 | ||
3179 | if (ret >= min_uV && ret <= max_uV) | |
3180 | return 1; | |
3181 | } | |
3182 | ||
3183 | return 0; | |
3184 | } | |
a398eaa2 | 3185 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3186 | |
a204f41e SH |
3187 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3188 | int max_uV) | |
3189 | { | |
3190 | const struct regulator_desc *desc = rdev->desc; | |
3191 | ||
3192 | if (desc->ops->map_voltage) | |
3193 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3194 | ||
3195 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3196 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3197 | ||
3198 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3199 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3200 | ||
18e4b55f MV |
3201 | if (desc->ops->list_voltage == |
3202 | regulator_list_voltage_pickable_linear_range) | |
3203 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3204 | min_uV, max_uV); | |
3205 | ||
a204f41e SH |
3206 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3207 | } | |
3208 | ||
7179569a HS |
3209 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3210 | int min_uV, int max_uV, | |
3211 | unsigned *selector) | |
3212 | { | |
3213 | struct pre_voltage_change_data data; | |
3214 | int ret; | |
3215 | ||
d22b85a1 | 3216 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3217 | data.min_uV = min_uV; |
3218 | data.max_uV = max_uV; | |
3219 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3220 | &data); | |
3221 | if (ret & NOTIFY_STOP_MASK) | |
3222 | return -EINVAL; | |
3223 | ||
3224 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3225 | if (ret >= 0) | |
3226 | return ret; | |
3227 | ||
3228 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3229 | (void *)data.old_uV); | |
3230 | ||
3231 | return ret; | |
3232 | } | |
3233 | ||
3234 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3235 | int uV, unsigned selector) | |
3236 | { | |
3237 | struct pre_voltage_change_data data; | |
3238 | int ret; | |
3239 | ||
d22b85a1 | 3240 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3241 | data.min_uV = uV; |
3242 | data.max_uV = uV; | |
3243 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3244 | &data); | |
3245 | if (ret & NOTIFY_STOP_MASK) | |
3246 | return -EINVAL; | |
3247 | ||
3248 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3249 | if (ret >= 0) | |
3250 | return ret; | |
3251 | ||
3252 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3253 | (void *)data.old_uV); | |
3254 | ||
3255 | return ret; | |
3256 | } | |
3257 | ||
2da8d947 BG |
3258 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3259 | int uV, int new_selector) | |
3260 | { | |
3261 | const struct regulator_ops *ops = rdev->desc->ops; | |
3262 | int diff, old_sel, curr_sel, ret; | |
3263 | ||
3264 | /* Stepping is only needed if the regulator is enabled. */ | |
3265 | if (!_regulator_is_enabled(rdev)) | |
3266 | goto final_set; | |
3267 | ||
3268 | if (!ops->get_voltage_sel) | |
3269 | return -EINVAL; | |
3270 | ||
3271 | old_sel = ops->get_voltage_sel(rdev); | |
3272 | if (old_sel < 0) | |
3273 | return old_sel; | |
3274 | ||
3275 | diff = new_selector - old_sel; | |
3276 | if (diff == 0) | |
3277 | return 0; /* No change needed. */ | |
3278 | ||
3279 | if (diff > 0) { | |
3280 | /* Stepping up. */ | |
3281 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3282 | curr_sel < new_selector; | |
3283 | curr_sel += rdev->desc->vsel_step) { | |
3284 | /* | |
3285 | * Call the callback directly instead of using | |
3286 | * _regulator_call_set_voltage_sel() as we don't | |
3287 | * want to notify anyone yet. Same in the branch | |
3288 | * below. | |
3289 | */ | |
3290 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3291 | if (ret) | |
3292 | goto try_revert; | |
3293 | } | |
3294 | } else { | |
3295 | /* Stepping down. */ | |
3296 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3297 | curr_sel > new_selector; | |
3298 | curr_sel -= rdev->desc->vsel_step) { | |
3299 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3300 | if (ret) | |
3301 | goto try_revert; | |
3302 | } | |
3303 | } | |
3304 | ||
3305 | final_set: | |
3306 | /* The final selector will trigger the notifiers. */ | |
3307 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3308 | ||
3309 | try_revert: | |
3310 | /* | |
3311 | * At least try to return to the previous voltage if setting a new | |
3312 | * one failed. | |
3313 | */ | |
3314 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3315 | return ret; | |
3316 | } | |
3317 | ||
73e705bf MK |
3318 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3319 | int old_uV, int new_uV) | |
3320 | { | |
3321 | unsigned int ramp_delay = 0; | |
3322 | ||
3323 | if (rdev->constraints->ramp_delay) | |
3324 | ramp_delay = rdev->constraints->ramp_delay; | |
3325 | else if (rdev->desc->ramp_delay) | |
3326 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3327 | else if (rdev->constraints->settling_time) |
3328 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3329 | else if (rdev->constraints->settling_time_up && |
3330 | (new_uV > old_uV)) | |
3331 | return rdev->constraints->settling_time_up; | |
3332 | else if (rdev->constraints->settling_time_down && | |
3333 | (new_uV < old_uV)) | |
3334 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3335 | |
3336 | if (ramp_delay == 0) { | |
ba14fa1a | 3337 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3338 | return 0; |
3339 | } | |
3340 | ||
3341 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3342 | } | |
3343 | ||
75790251 MB |
3344 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3345 | int min_uV, int max_uV) | |
3346 | { | |
3347 | int ret; | |
77af1b26 | 3348 | int delay = 0; |
e113d792 | 3349 | int best_val = 0; |
75790251 | 3350 | unsigned int selector; |
eba41a5e | 3351 | int old_selector = -1; |
57995a48 | 3352 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3353 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3354 | |
3355 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3356 | ||
bf5892a8 MB |
3357 | min_uV += rdev->constraints->uV_offset; |
3358 | max_uV += rdev->constraints->uV_offset; | |
3359 | ||
eba41a5e AL |
3360 | /* |
3361 | * If we can't obtain the old selector there is not enough | |
3362 | * info to call set_voltage_time_sel(). | |
3363 | */ | |
8b7485ef | 3364 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3365 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3366 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3367 | if (old_selector < 0) |
3368 | return old_selector; | |
3369 | } | |
3370 | ||
57995a48 | 3371 | if (ops->set_voltage) { |
7179569a HS |
3372 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3373 | &selector); | |
e113d792 MB |
3374 | |
3375 | if (ret >= 0) { | |
57995a48 MK |
3376 | if (ops->list_voltage) |
3377 | best_val = ops->list_voltage(rdev, | |
3378 | selector); | |
e113d792 | 3379 | else |
d22b85a1 | 3380 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3381 | } |
3382 | ||
57995a48 | 3383 | } else if (ops->set_voltage_sel) { |
a204f41e | 3384 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3385 | if (ret >= 0) { |
57995a48 | 3386 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3387 | if (min_uV <= best_val && max_uV >= best_val) { |
3388 | selector = ret; | |
c66a566a AL |
3389 | if (old_selector == selector) |
3390 | ret = 0; | |
2da8d947 BG |
3391 | else if (rdev->desc->vsel_step) |
3392 | ret = _regulator_set_voltage_sel_step( | |
3393 | rdev, best_val, selector); | |
c66a566a | 3394 | else |
7179569a HS |
3395 | ret = _regulator_call_set_voltage_sel( |
3396 | rdev, best_val, selector); | |
e113d792 MB |
3397 | } else { |
3398 | ret = -EINVAL; | |
3399 | } | |
e8eef82b | 3400 | } |
75790251 MB |
3401 | } else { |
3402 | ret = -EINVAL; | |
3403 | } | |
e8eef82b | 3404 | |
31dfe686 MK |
3405 | if (ret) |
3406 | goto out; | |
77af1b26 | 3407 | |
73e705bf MK |
3408 | if (ops->set_voltage_time_sel) { |
3409 | /* | |
3410 | * Call set_voltage_time_sel if successfully obtained | |
3411 | * old_selector | |
3412 | */ | |
3413 | if (old_selector >= 0 && old_selector != selector) | |
3414 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3415 | selector); | |
3416 | } else { | |
3417 | if (old_uV != best_val) { | |
3418 | if (ops->set_voltage_time) | |
3419 | delay = ops->set_voltage_time(rdev, old_uV, | |
3420 | best_val); | |
3421 | else | |
3422 | delay = _regulator_set_voltage_time(rdev, | |
3423 | old_uV, | |
3424 | best_val); | |
e8eef82b | 3425 | } |
73e705bf | 3426 | } |
75790251 | 3427 | |
73e705bf | 3428 | if (delay < 0) { |
61aab5ad | 3429 | rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay)); |
73e705bf | 3430 | delay = 0; |
77af1b26 LW |
3431 | } |
3432 | ||
73e705bf MK |
3433 | /* Insert any necessary delays */ |
3434 | if (delay >= 1000) { | |
3435 | mdelay(delay / 1000); | |
3436 | udelay(delay % 1000); | |
3437 | } else if (delay) { | |
3438 | udelay(delay); | |
77af1b26 LW |
3439 | } |
3440 | ||
31dfe686 | 3441 | if (best_val >= 0) { |
2f6c797f AL |
3442 | unsigned long data = best_val; |
3443 | ||
ded06a52 | 3444 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3445 | (void *)data); |
3446 | } | |
ded06a52 | 3447 | |
31dfe686 | 3448 | out: |
eba41a5e | 3449 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3450 | |
3451 | return ret; | |
3452 | } | |
3453 | ||
f7efad10 CZ |
3454 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3455 | int min_uV, int max_uV, suspend_state_t state) | |
3456 | { | |
3457 | struct regulator_state *rstate; | |
3458 | int uV, sel; | |
3459 | ||
3460 | rstate = regulator_get_suspend_state(rdev, state); | |
3461 | if (rstate == NULL) | |
3462 | return -EINVAL; | |
3463 | ||
3464 | if (min_uV < rstate->min_uV) | |
3465 | min_uV = rstate->min_uV; | |
3466 | if (max_uV > rstate->max_uV) | |
3467 | max_uV = rstate->max_uV; | |
3468 | ||
3469 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3470 | if (sel < 0) | |
3471 | return sel; | |
3472 | ||
3473 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3474 | if (uV >= min_uV && uV <= max_uV) | |
3475 | rstate->uV = uV; | |
3476 | ||
3477 | return 0; | |
3478 | } | |
3479 | ||
a9f226bc | 3480 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3481 | int min_uV, int max_uV, |
3482 | suspend_state_t state) | |
414c70cb LG |
3483 | { |
3484 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3485 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3486 | int ret = 0; |
92d7a558 | 3487 | int old_min_uV, old_max_uV; |
c00dc359 | 3488 | int current_uV; |
414c70cb | 3489 | |
95a3c23a MB |
3490 | /* If we're setting the same range as last time the change |
3491 | * should be a noop (some cpufreq implementations use the same | |
3492 | * voltage for multiple frequencies, for example). | |
3493 | */ | |
c360a6df | 3494 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3495 | goto out; |
3496 | ||
c00dc359 | 3497 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3498 | * return successfully even though the regulator does not support |
c00dc359 BA |
3499 | * changing the voltage. |
3500 | */ | |
8a34e979 | 3501 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3502 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3503 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3504 | voltage->min_uV = min_uV; |
3505 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3506 | goto out; |
3507 | } | |
3508 | } | |
3509 | ||
414c70cb | 3510 | /* sanity check */ |
e8eef82b MB |
3511 | if (!rdev->desc->ops->set_voltage && |
3512 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3513 | ret = -EINVAL; |
3514 | goto out; | |
3515 | } | |
3516 | ||
3517 | /* constraints check */ | |
3518 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3519 | if (ret < 0) | |
3520 | goto out; | |
0d25d09d | 3521 | |
92d7a558 | 3522 | /* restore original values in case of error */ |
c360a6df CZ |
3523 | old_min_uV = voltage->min_uV; |
3524 | old_max_uV = voltage->max_uV; | |
3525 | voltage->min_uV = min_uV; | |
3526 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3527 | |
9243a195 MP |
3528 | /* for not coupled regulators this will just set the voltage */ |
3529 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3530 | if (ret < 0) { |
3531 | voltage->min_uV = old_min_uV; | |
3532 | voltage->max_uV = old_max_uV; | |
3533 | } | |
05fda3b1 | 3534 | |
9243a195 | 3535 | out: |
9243a195 MP |
3536 | return ret; |
3537 | } | |
3538 | ||
d22b85a1 DO |
3539 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3540 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3541 | { |
3542 | int best_supply_uV = 0; | |
3543 | int supply_change_uV = 0; | |
3544 | int ret; | |
3545 | ||
43fc99f2 MB |
3546 | if (rdev->supply && |
3547 | regulator_ops_is_valid(rdev->supply->rdev, | |
3548 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3549 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3550 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3551 | int current_supply_uV; |
3552 | int selector; | |
3553 | ||
3554 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3555 | if (selector < 0) { | |
3556 | ret = selector; | |
9243a195 | 3557 | goto out; |
fc42112c SH |
3558 | } |
3559 | ||
00cb9f4f | 3560 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3561 | if (best_supply_uV < 0) { |
3562 | ret = best_supply_uV; | |
9243a195 | 3563 | goto out; |
fc42112c SH |
3564 | } |
3565 | ||
3566 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3567 | ||
d22b85a1 | 3568 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3569 | if (current_supply_uV < 0) { |
3570 | ret = current_supply_uV; | |
9243a195 | 3571 | goto out; |
fc42112c SH |
3572 | } |
3573 | ||
3574 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3575 | } | |
3576 | ||
3577 | if (supply_change_uV > 0) { | |
3578 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3579 | best_supply_uV, INT_MAX, state); |
fc42112c | 3580 | if (ret) { |
61aab5ad MM |
3581 | dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n", |
3582 | ERR_PTR(ret)); | |
9243a195 | 3583 | goto out; |
fc42112c SH |
3584 | } |
3585 | } | |
3586 | ||
f7efad10 CZ |
3587 | if (state == PM_SUSPEND_ON) |
3588 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3589 | else | |
3590 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3591 | max_uV, state); | |
92d7a558 | 3592 | if (ret < 0) |
9243a195 | 3593 | goto out; |
0d25d09d | 3594 | |
fc42112c SH |
3595 | if (supply_change_uV < 0) { |
3596 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3597 | best_supply_uV, INT_MAX, state); |
fc42112c | 3598 | if (ret) |
61aab5ad MM |
3599 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n", |
3600 | ERR_PTR(ret)); | |
fc42112c SH |
3601 | /* No need to fail here */ |
3602 | ret = 0; | |
3603 | } | |
3604 | ||
414c70cb | 3605 | out: |
a9f226bc | 3606 | return ret; |
69686176 | 3607 | } |
3d7610e8 | 3608 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3609 | |
85254bcf DO |
3610 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3611 | int *current_uV, int *min_uV) | |
3612 | { | |
3613 | struct regulation_constraints *constraints = rdev->constraints; | |
3614 | ||
3615 | /* Limit voltage change only if necessary */ | |
3616 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3617 | return 1; | |
3618 | ||
3619 | if (*current_uV < 0) { | |
d22b85a1 | 3620 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3621 | |
3622 | if (*current_uV < 0) | |
3623 | return *current_uV; | |
3624 | } | |
3625 | ||
3626 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3627 | return 1; | |
3628 | ||
3629 | /* Clamp target voltage within the given step */ | |
3630 | if (*current_uV < *min_uV) | |
3631 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3632 | *min_uV); | |
3633 | else | |
3634 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3635 | *min_uV); | |
3636 | ||
3637 | return 0; | |
3638 | } | |
3639 | ||
c054c6c7 MP |
3640 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3641 | int *current_uV, | |
3642 | int *min_uV, int *max_uV, | |
3643 | suspend_state_t state, | |
3644 | int n_coupled) | |
3645 | { | |
3646 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3647 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3648 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3649 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3650 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3651 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3652 | int i, ret, max_spread; |
c054c6c7 MP |
3653 | bool done; |
3654 | ||
3655 | *current_uV = -1; | |
3656 | ||
3657 | /* | |
3658 | * If there are no coupled regulators, simply set the voltage | |
3659 | * demanded by consumers. | |
3660 | */ | |
3661 | if (n_coupled == 1) { | |
3662 | /* | |
3663 | * If consumers don't provide any demands, set voltage | |
3664 | * to min_uV | |
3665 | */ | |
3666 | desired_min_uV = constraints->min_uV; | |
3667 | desired_max_uV = constraints->max_uV; | |
3668 | ||
3669 | ret = regulator_check_consumers(rdev, | |
3670 | &desired_min_uV, | |
3671 | &desired_max_uV, state); | |
3672 | if (ret < 0) | |
3673 | return ret; | |
3674 | ||
3675 | possible_uV = desired_min_uV; | |
3676 | done = true; | |
3677 | ||
3678 | goto finish; | |
3679 | } | |
3680 | ||
3681 | /* Find highest min desired voltage */ | |
3682 | for (i = 0; i < n_coupled; i++) { | |
3683 | int tmp_min = 0; | |
3684 | int tmp_max = INT_MAX; | |
3685 | ||
f8702f9e | 3686 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3687 | |
3688 | ret = regulator_check_consumers(c_rdevs[i], | |
3689 | &tmp_min, | |
3690 | &tmp_max, state); | |
3691 | if (ret < 0) | |
3692 | return ret; | |
3693 | ||
3694 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3695 | if (ret < 0) | |
3696 | return ret; | |
69686176 | 3697 | |
c054c6c7 MP |
3698 | highest_min_uV = max(highest_min_uV, tmp_min); |
3699 | ||
3700 | if (i == 0) { | |
3701 | desired_min_uV = tmp_min; | |
3702 | desired_max_uV = tmp_max; | |
3703 | } | |
3704 | } | |
3705 | ||
d8ca7d18 DO |
3706 | max_spread = constraints->max_spread[0]; |
3707 | ||
c054c6c7 MP |
3708 | /* |
3709 | * Let target_uV be equal to the desired one if possible. | |
3710 | * If not, set it to minimum voltage, allowed by other coupled | |
3711 | * regulators. | |
3712 | */ | |
3713 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3714 | ||
3715 | /* | |
3716 | * Find min and max voltages, which currently aren't violating | |
3717 | * max_spread. | |
3718 | */ | |
3719 | for (i = 1; i < n_coupled; i++) { | |
3720 | int tmp_act; | |
3721 | ||
3722 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3723 | continue; | |
3724 | ||
d22b85a1 | 3725 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3726 | if (tmp_act < 0) |
3727 | return tmp_act; | |
3728 | ||
3729 | min_current_uV = min(tmp_act, min_current_uV); | |
3730 | max_current_uV = max(tmp_act, max_current_uV); | |
3731 | } | |
3732 | ||
3733 | /* There aren't any other regulators enabled */ | |
3734 | if (max_current_uV == 0) { | |
3735 | possible_uV = target_uV; | |
3736 | } else { | |
3737 | /* | |
3738 | * Correct target voltage, so as it currently isn't | |
3739 | * violating max_spread | |
3740 | */ | |
3741 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3742 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3743 | } | |
3744 | ||
3745 | if (possible_uV > desired_max_uV) | |
3746 | return -EINVAL; | |
3747 | ||
3748 | done = (possible_uV == target_uV); | |
3749 | desired_min_uV = possible_uV; | |
3750 | ||
3751 | finish: | |
85254bcf DO |
3752 | /* Apply max_uV_step constraint if necessary */ |
3753 | if (state == PM_SUSPEND_ON) { | |
3754 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3755 | &desired_min_uV); | |
3756 | if (ret < 0) | |
3757 | return ret; | |
3758 | ||
3759 | if (ret == 0) | |
3760 | done = false; | |
3761 | } | |
3762 | ||
c054c6c7 MP |
3763 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3764 | if (n_coupled > 1 && *current_uV == -1) { | |
3765 | ||
3766 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3767 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3768 | if (ret < 0) |
3769 | return ret; | |
3770 | ||
3771 | *current_uV = ret; | |
3772 | } else { | |
3773 | *current_uV = desired_min_uV; | |
3774 | } | |
3775 | } | |
3776 | ||
3777 | *min_uV = desired_min_uV; | |
3778 | *max_uV = desired_max_uV; | |
3779 | ||
3780 | return done; | |
3781 | } | |
3782 | ||
752db83a MS |
3783 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3784 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3785 | { |
3786 | struct regulator_dev **c_rdevs; | |
3787 | struct regulator_dev *best_rdev; | |
3788 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3789 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3790 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3791 | unsigned long c_rdev_done = 0; |
3792 | bool best_c_rdev_done; | |
c054c6c7 MP |
3793 | |
3794 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3795 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3796 | |
3797 | /* | |
3798 | * Find the best possible voltage change on each loop. Leave the loop | |
3799 | * if there isn't any possible change. | |
3800 | */ | |
3801 | do { | |
3802 | best_c_rdev_done = false; | |
3803 | best_delta = 0; | |
3804 | best_min_uV = 0; | |
3805 | best_max_uV = 0; | |
3806 | best_c_rdev = 0; | |
3807 | best_rdev = NULL; | |
3808 | ||
3809 | /* | |
3810 | * Find highest difference between optimal voltage | |
3811 | * and current voltage. | |
3812 | */ | |
3813 | for (i = 0; i < n_coupled; i++) { | |
3814 | /* | |
3815 | * optimal_uV is the best voltage that can be set for | |
3816 | * i-th regulator at the moment without violating | |
3817 | * max_spread constraint in order to balance | |
3818 | * the coupled voltages. | |
3819 | */ | |
3820 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3821 | ||
d8ca7d18 | 3822 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
3823 | continue; |
3824 | ||
3825 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3826 | ¤t_uV, | |
3827 | &optimal_uV, | |
3828 | &optimal_max_uV, | |
3829 | state, n_coupled); | |
3830 | if (ret < 0) | |
3831 | goto out; | |
3832 | ||
3833 | delta = abs(optimal_uV - current_uV); | |
3834 | ||
3835 | if (delta && best_delta <= delta) { | |
3836 | best_c_rdev_done = ret; | |
3837 | best_delta = delta; | |
3838 | best_rdev = c_rdevs[i]; | |
3839 | best_min_uV = optimal_uV; | |
3840 | best_max_uV = optimal_max_uV; | |
3841 | best_c_rdev = i; | |
3842 | } | |
3843 | } | |
3844 | ||
3845 | /* Nothing to change, return successfully */ | |
3846 | if (!best_rdev) { | |
3847 | ret = 0; | |
3848 | goto out; | |
3849 | } | |
9243a195 | 3850 | |
c054c6c7 MP |
3851 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3852 | best_max_uV, state); | |
9243a195 | 3853 | |
c054c6c7 MP |
3854 | if (ret < 0) |
3855 | goto out; | |
3856 | ||
d8ca7d18 DO |
3857 | if (best_c_rdev_done) |
3858 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
3859 | |
3860 | } while (n_coupled > 1); | |
3861 | ||
3862 | out: | |
69686176 MP |
3863 | return ret; |
3864 | } | |
3865 | ||
752db83a MS |
3866 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
3867 | suspend_state_t state) | |
3868 | { | |
3869 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3870 | struct regulator_coupler *coupler = c_desc->coupler; | |
3871 | bool skip_coupled = false; | |
3872 | ||
3873 | /* | |
3874 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3875 | * other coupled regulators. | |
3876 | */ | |
3877 | if (state != PM_SUSPEND_ON) | |
3878 | skip_coupled = true; | |
3879 | ||
3880 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
3881 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3882 | return -EPERM; | |
3883 | } | |
3884 | ||
3885 | /* Invoke custom balancer for customized couplers */ | |
3886 | if (coupler && coupler->balance_voltage) | |
3887 | return coupler->balance_voltage(coupler, rdev, state); | |
3888 | ||
3889 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
3890 | } | |
3891 | ||
a9f226bc SH |
3892 | /** |
3893 | * regulator_set_voltage - set regulator output voltage | |
3894 | * @regulator: regulator source | |
3895 | * @min_uV: Minimum required voltage in uV | |
3896 | * @max_uV: Maximum acceptable voltage in uV | |
3897 | * | |
3898 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3899 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3900 | * | |
3901 | * If the regulator is enabled then the voltage will change to the new value | |
3902 | * immediately otherwise if the regulator is disabled the regulator will | |
3903 | * output at the new voltage when enabled. | |
3904 | * | |
3905 | * NOTE: If the regulator is shared between several devices then the lowest | |
3906 | * request voltage that meets the system constraints will be used. | |
3907 | * Regulator system constraints must be set for this regulator before | |
3908 | * calling this function otherwise this call will fail. | |
3909 | */ | |
3910 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3911 | { | |
f8702f9e DO |
3912 | struct ww_acquire_ctx ww_ctx; |
3913 | int ret; | |
a9f226bc | 3914 | |
f8702f9e | 3915 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3916 | |
c360a6df CZ |
3917 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3918 | PM_SUSPEND_ON); | |
a9f226bc | 3919 | |
f8702f9e | 3920 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3921 | |
414c70cb LG |
3922 | return ret; |
3923 | } | |
3924 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3925 | ||
f7efad10 CZ |
3926 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3927 | suspend_state_t state, bool en) | |
3928 | { | |
3929 | struct regulator_state *rstate; | |
3930 | ||
3931 | rstate = regulator_get_suspend_state(rdev, state); | |
3932 | if (rstate == NULL) | |
3933 | return -EINVAL; | |
3934 | ||
3935 | if (!rstate->changeable) | |
3936 | return -EPERM; | |
3937 | ||
3edd79cf | 3938 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3939 | |
3940 | return 0; | |
3941 | } | |
3942 | ||
3943 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3944 | suspend_state_t state) | |
3945 | { | |
3946 | return regulator_suspend_toggle(rdev, state, true); | |
3947 | } | |
3948 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3949 | ||
3950 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3951 | suspend_state_t state) | |
3952 | { | |
3953 | struct regulator *regulator; | |
3954 | struct regulator_voltage *voltage; | |
3955 | ||
3956 | /* | |
3957 | * if any consumer wants this regulator device keeping on in | |
3958 | * suspend states, don't set it as disabled. | |
3959 | */ | |
3960 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3961 | voltage = ®ulator->voltage[state]; | |
3962 | if (voltage->min_uV || voltage->max_uV) | |
3963 | return 0; | |
3964 | } | |
3965 | ||
3966 | return regulator_suspend_toggle(rdev, state, false); | |
3967 | } | |
3968 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3969 | ||
3970 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3971 | int min_uV, int max_uV, | |
3972 | suspend_state_t state) | |
3973 | { | |
3974 | struct regulator_dev *rdev = regulator->rdev; | |
3975 | struct regulator_state *rstate; | |
3976 | ||
3977 | rstate = regulator_get_suspend_state(rdev, state); | |
3978 | if (rstate == NULL) | |
3979 | return -EINVAL; | |
3980 | ||
3981 | if (rstate->min_uV == rstate->max_uV) { | |
3982 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3983 | return -EPERM; | |
3984 | } | |
3985 | ||
3986 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3987 | } | |
3988 | ||
3989 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3990 | int max_uV, suspend_state_t state) | |
3991 | { | |
f8702f9e DO |
3992 | struct ww_acquire_ctx ww_ctx; |
3993 | int ret; | |
f7efad10 CZ |
3994 | |
3995 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3996 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3997 | return -EINVAL; | |
3998 | ||
f8702f9e | 3999 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4000 | |
4001 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
4002 | max_uV, state); | |
4003 | ||
f8702f9e | 4004 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4005 | |
4006 | return ret; | |
4007 | } | |
4008 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
4009 | ||
88cd222b LW |
4010 | /** |
4011 | * regulator_set_voltage_time - get raise/fall time | |
4012 | * @regulator: regulator source | |
4013 | * @old_uV: starting voltage in microvolts | |
4014 | * @new_uV: target voltage in microvolts | |
4015 | * | |
4016 | * Provided with the starting and ending voltage, this function attempts to | |
4017 | * calculate the time in microseconds required to rise or fall to this new | |
4018 | * voltage. | |
4019 | */ | |
4020 | int regulator_set_voltage_time(struct regulator *regulator, | |
4021 | int old_uV, int new_uV) | |
4022 | { | |
272e2315 GX |
4023 | struct regulator_dev *rdev = regulator->rdev; |
4024 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
4025 | int old_sel = -1; |
4026 | int new_sel = -1; | |
4027 | int voltage; | |
4028 | int i; | |
4029 | ||
73e705bf MK |
4030 | if (ops->set_voltage_time) |
4031 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
4032 | else if (!ops->set_voltage_time_sel) | |
4033 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
4034 | ||
88cd222b | 4035 | /* Currently requires operations to do this */ |
73e705bf | 4036 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
4037 | return -EINVAL; |
4038 | ||
4039 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
4040 | /* We only look for exact voltage matches here */ | |
bdcd1177 CB |
4041 | if (i < rdev->desc->linear_min_sel) |
4042 | continue; | |
4043 | ||
ab97800e CB |
4044 | if (old_sel >= 0 && new_sel >= 0) |
4045 | break; | |
4046 | ||
88cd222b LW |
4047 | voltage = regulator_list_voltage(regulator, i); |
4048 | if (voltage < 0) | |
4049 | return -EINVAL; | |
4050 | if (voltage == 0) | |
4051 | continue; | |
4052 | if (voltage == old_uV) | |
4053 | old_sel = i; | |
4054 | if (voltage == new_uV) | |
4055 | new_sel = i; | |
4056 | } | |
4057 | ||
4058 | if (old_sel < 0 || new_sel < 0) | |
4059 | return -EINVAL; | |
4060 | ||
4061 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
4062 | } | |
4063 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
4064 | ||
98a175b6 | 4065 | /** |
296c6566 RD |
4066 | * regulator_set_voltage_time_sel - get raise/fall time |
4067 | * @rdev: regulator source device | |
98a175b6 YSB |
4068 | * @old_selector: selector for starting voltage |
4069 | * @new_selector: selector for target voltage | |
4070 | * | |
4071 | * Provided with the starting and target voltage selectors, this function | |
4072 | * returns time in microseconds required to rise or fall to this new voltage | |
4073 | * | |
f11d08c3 | 4074 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4075 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4076 | */ |
4077 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4078 | unsigned int old_selector, | |
4079 | unsigned int new_selector) | |
4080 | { | |
f11d08c3 | 4081 | int old_volt, new_volt; |
398715ab | 4082 | |
f11d08c3 AL |
4083 | /* sanity check */ |
4084 | if (!rdev->desc->ops->list_voltage) | |
4085 | return -EINVAL; | |
398715ab | 4086 | |
f11d08c3 AL |
4087 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4088 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4089 | ||
73e705bf MK |
4090 | if (rdev->desc->ops->set_voltage_time) |
4091 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4092 | new_volt); | |
4093 | else | |
4094 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4095 | } |
b19dbf71 | 4096 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4097 | |
606a2562 MB |
4098 | /** |
4099 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4100 | * @regulator: regulator source | |
4101 | * | |
4102 | * Re-apply the last configured voltage. This is intended to be used | |
4103 | * where some external control source the consumer is cooperating with | |
4104 | * has caused the configured voltage to change. | |
4105 | */ | |
4106 | int regulator_sync_voltage(struct regulator *regulator) | |
4107 | { | |
4108 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4109 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4110 | int ret, min_uV, max_uV; |
4111 | ||
66cf9a7e | 4112 | regulator_lock(rdev); |
606a2562 MB |
4113 | |
4114 | if (!rdev->desc->ops->set_voltage && | |
4115 | !rdev->desc->ops->set_voltage_sel) { | |
4116 | ret = -EINVAL; | |
4117 | goto out; | |
4118 | } | |
4119 | ||
4120 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4121 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4122 | ret = -EINVAL; |
4123 | goto out; | |
4124 | } | |
4125 | ||
c360a6df CZ |
4126 | min_uV = voltage->min_uV; |
4127 | max_uV = voltage->max_uV; | |
606a2562 MB |
4128 | |
4129 | /* This should be a paranoia check... */ | |
4130 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4131 | if (ret < 0) | |
4132 | goto out; | |
4133 | ||
c360a6df | 4134 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4135 | if (ret < 0) |
4136 | goto out; | |
4137 | ||
24be0c71 DO |
4138 | /* balance only, if regulator is coupled */ |
4139 | if (rdev->coupling_desc.n_coupled > 1) | |
4140 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4141 | else | |
4142 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
606a2562 MB |
4143 | |
4144 | out: | |
66cf9a7e | 4145 | regulator_unlock(rdev); |
606a2562 MB |
4146 | return ret; |
4147 | } | |
4148 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4149 | ||
d22b85a1 | 4150 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4151 | { |
bf5892a8 | 4152 | int sel, ret; |
fef95019 MB |
4153 | bool bypassed; |
4154 | ||
4155 | if (rdev->desc->ops->get_bypass) { | |
4156 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4157 | if (ret < 0) | |
4158 | return ret; | |
4159 | if (bypassed) { | |
4160 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4161 | if (!rdev->supply) { |
4162 | rdev_err(rdev, | |
4163 | "bypassed regulator has no supply!\n"); | |
4164 | return -EPROBE_DEFER; | |
4165 | } | |
fef95019 | 4166 | |
d22b85a1 | 4167 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4168 | } |
4169 | } | |
476c2d83 MB |
4170 | |
4171 | if (rdev->desc->ops->get_voltage_sel) { | |
4172 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4173 | if (sel < 0) | |
4174 | return sel; | |
bf5892a8 | 4175 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4176 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4177 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4178 | } else if (rdev->desc->ops->list_voltage) { |
4179 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4180 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4181 | ret = rdev->desc->fixed_uV; | |
e303996e | 4182 | } else if (rdev->supply) { |
d22b85a1 | 4183 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cf1ad559 MM |
4184 | } else if (rdev->supply_name) { |
4185 | return -EPROBE_DEFER; | |
cb220d16 | 4186 | } else { |
414c70cb | 4187 | return -EINVAL; |
cb220d16 | 4188 | } |
bf5892a8 | 4189 | |
cb220d16 AL |
4190 | if (ret < 0) |
4191 | return ret; | |
bf5892a8 | 4192 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4193 | } |
3d7610e8 | 4194 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4195 | |
4196 | /** | |
4197 | * regulator_get_voltage - get regulator output voltage | |
4198 | * @regulator: regulator source | |
4199 | * | |
4200 | * This returns the current regulator voltage in uV. | |
4201 | * | |
4202 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4203 | * function should not be used to determine regulator state. | |
4204 | */ | |
4205 | int regulator_get_voltage(struct regulator *regulator) | |
4206 | { | |
f8702f9e | 4207 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4208 | int ret; |
4209 | ||
f8702f9e | 4210 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4211 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4212 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4213 | |
4214 | return ret; | |
4215 | } | |
4216 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4217 | ||
4218 | /** | |
4219 | * regulator_set_current_limit - set regulator output current limit | |
4220 | * @regulator: regulator source | |
ce0d10f8 | 4221 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4222 | * @max_uA: Maximum supported current in uA |
4223 | * | |
4224 | * Sets current sink to the desired output current. This can be set during | |
4225 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4226 | * | |
4227 | * If the regulator is enabled then the current will change to the new value | |
4228 | * immediately otherwise if the regulator is disabled the regulator will | |
4229 | * output at the new current when enabled. | |
4230 | * | |
4231 | * NOTE: Regulator system constraints must be set for this regulator before | |
4232 | * calling this function otherwise this call will fail. | |
4233 | */ | |
4234 | int regulator_set_current_limit(struct regulator *regulator, | |
4235 | int min_uA, int max_uA) | |
4236 | { | |
4237 | struct regulator_dev *rdev = regulator->rdev; | |
4238 | int ret; | |
4239 | ||
66cf9a7e | 4240 | regulator_lock(rdev); |
414c70cb LG |
4241 | |
4242 | /* sanity check */ | |
4243 | if (!rdev->desc->ops->set_current_limit) { | |
4244 | ret = -EINVAL; | |
4245 | goto out; | |
4246 | } | |
4247 | ||
4248 | /* constraints check */ | |
4249 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4250 | if (ret < 0) | |
4251 | goto out; | |
4252 | ||
4253 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4254 | out: | |
66cf9a7e | 4255 | regulator_unlock(rdev); |
414c70cb LG |
4256 | return ret; |
4257 | } | |
4258 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4259 | ||
7e4d9683 DA |
4260 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4261 | { | |
4262 | /* sanity check */ | |
4263 | if (!rdev->desc->ops->get_current_limit) | |
4264 | return -EINVAL; | |
4265 | ||
4266 | return rdev->desc->ops->get_current_limit(rdev); | |
4267 | } | |
4268 | ||
414c70cb LG |
4269 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4270 | { | |
4271 | int ret; | |
4272 | ||
66cf9a7e | 4273 | regulator_lock(rdev); |
7e4d9683 | 4274 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4275 | regulator_unlock(rdev); |
7e4d9683 | 4276 | |
414c70cb LG |
4277 | return ret; |
4278 | } | |
4279 | ||
4280 | /** | |
4281 | * regulator_get_current_limit - get regulator output current | |
4282 | * @regulator: regulator source | |
4283 | * | |
4284 | * This returns the current supplied by the specified current sink in uA. | |
4285 | * | |
4286 | * NOTE: If the regulator is disabled it will return the current value. This | |
4287 | * function should not be used to determine regulator state. | |
4288 | */ | |
4289 | int regulator_get_current_limit(struct regulator *regulator) | |
4290 | { | |
4291 | return _regulator_get_current_limit(regulator->rdev); | |
4292 | } | |
4293 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4294 | ||
4295 | /** | |
4296 | * regulator_set_mode - set regulator operating mode | |
4297 | * @regulator: regulator source | |
4298 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4299 | * | |
4300 | * Set regulator operating mode to increase regulator efficiency or improve | |
4301 | * regulation performance. | |
4302 | * | |
4303 | * NOTE: Regulator system constraints must be set for this regulator before | |
4304 | * calling this function otherwise this call will fail. | |
4305 | */ | |
4306 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4307 | { | |
4308 | struct regulator_dev *rdev = regulator->rdev; | |
4309 | int ret; | |
500b4ac9 | 4310 | int regulator_curr_mode; |
414c70cb | 4311 | |
66cf9a7e | 4312 | regulator_lock(rdev); |
414c70cb LG |
4313 | |
4314 | /* sanity check */ | |
4315 | if (!rdev->desc->ops->set_mode) { | |
4316 | ret = -EINVAL; | |
4317 | goto out; | |
4318 | } | |
4319 | ||
500b4ac9 SI |
4320 | /* return if the same mode is requested */ |
4321 | if (rdev->desc->ops->get_mode) { | |
4322 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4323 | if (regulator_curr_mode == mode) { | |
4324 | ret = 0; | |
4325 | goto out; | |
4326 | } | |
4327 | } | |
4328 | ||
414c70cb | 4329 | /* constraints check */ |
22c51b47 | 4330 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4331 | if (ret < 0) |
4332 | goto out; | |
4333 | ||
4334 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4335 | out: | |
66cf9a7e | 4336 | regulator_unlock(rdev); |
414c70cb LG |
4337 | return ret; |
4338 | } | |
4339 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4340 | ||
7e4d9683 DA |
4341 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4342 | { | |
4343 | /* sanity check */ | |
4344 | if (!rdev->desc->ops->get_mode) | |
4345 | return -EINVAL; | |
4346 | ||
4347 | return rdev->desc->ops->get_mode(rdev); | |
4348 | } | |
4349 | ||
414c70cb LG |
4350 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4351 | { | |
4352 | int ret; | |
4353 | ||
66cf9a7e | 4354 | regulator_lock(rdev); |
7e4d9683 | 4355 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4356 | regulator_unlock(rdev); |
7e4d9683 | 4357 | |
414c70cb LG |
4358 | return ret; |
4359 | } | |
4360 | ||
4361 | /** | |
4362 | * regulator_get_mode - get regulator operating mode | |
4363 | * @regulator: regulator source | |
4364 | * | |
4365 | * Get the current regulator operating mode. | |
4366 | */ | |
4367 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4368 | { | |
4369 | return _regulator_get_mode(regulator->rdev); | |
4370 | } | |
4371 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4372 | ||
1b5b4221 AH |
4373 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4374 | unsigned int *flags) | |
4375 | { | |
4376 | int ret; | |
4377 | ||
66cf9a7e | 4378 | regulator_lock(rdev); |
1b5b4221 AH |
4379 | |
4380 | /* sanity check */ | |
4381 | if (!rdev->desc->ops->get_error_flags) { | |
4382 | ret = -EINVAL; | |
4383 | goto out; | |
4384 | } | |
4385 | ||
4386 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4387 | out: | |
66cf9a7e | 4388 | regulator_unlock(rdev); |
1b5b4221 AH |
4389 | return ret; |
4390 | } | |
4391 | ||
4392 | /** | |
4393 | * regulator_get_error_flags - get regulator error information | |
4394 | * @regulator: regulator source | |
4395 | * @flags: pointer to store error flags | |
4396 | * | |
4397 | * Get the current regulator error information. | |
4398 | */ | |
4399 | int regulator_get_error_flags(struct regulator *regulator, | |
4400 | unsigned int *flags) | |
4401 | { | |
4402 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4403 | } | |
4404 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4405 | ||
414c70cb | 4406 | /** |
e39ce48f | 4407 | * regulator_set_load - set regulator load |
414c70cb LG |
4408 | * @regulator: regulator source |
4409 | * @uA_load: load current | |
4410 | * | |
4411 | * Notifies the regulator core of a new device load. This is then used by | |
4412 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4413 | * operating mode for the new regulator loading. | |
4414 | * | |
4415 | * Consumer devices notify their supply regulator of the maximum power | |
4416 | * they will require (can be taken from device datasheet in the power | |
4417 | * consumption tables) when they change operational status and hence power | |
4418 | * state. Examples of operational state changes that can affect power | |
4419 | * consumption are :- | |
4420 | * | |
4421 | * o Device is opened / closed. | |
4422 | * o Device I/O is about to begin or has just finished. | |
4423 | * o Device is idling in between work. | |
4424 | * | |
4425 | * This information is also exported via sysfs to userspace. | |
4426 | * | |
4427 | * DRMS will sum the total requested load on the regulator and change | |
4428 | * to the most efficient operating mode if platform constraints allow. | |
4429 | * | |
5451781d DA |
4430 | * NOTE: when a regulator consumer requests to have a regulator |
4431 | * disabled then any load that consumer requested no longer counts | |
4432 | * toward the total requested load. If the regulator is re-enabled | |
4433 | * then the previously requested load will start counting again. | |
4434 | * | |
4435 | * If a regulator is an always-on regulator then an individual consumer's | |
4436 | * load will still be removed if that consumer is fully disabled. | |
4437 | * | |
e39ce48f | 4438 | * On error a negative errno is returned. |
414c70cb | 4439 | */ |
e39ce48f | 4440 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4441 | { |
4442 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4443 | int old_uA_load; |
4444 | int ret = 0; | |
d92d95b6 | 4445 | |
66cf9a7e | 4446 | regulator_lock(rdev); |
5451781d | 4447 | old_uA_load = regulator->uA_load; |
414c70cb | 4448 | regulator->uA_load = uA_load; |
5451781d DA |
4449 | if (regulator->enable_count && old_uA_load != uA_load) { |
4450 | ret = drms_uA_update(rdev); | |
4451 | if (ret < 0) | |
4452 | regulator->uA_load = old_uA_load; | |
4453 | } | |
66cf9a7e | 4454 | regulator_unlock(rdev); |
8460ef38 | 4455 | |
414c70cb LG |
4456 | return ret; |
4457 | } | |
e39ce48f | 4458 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4459 | |
f59c8f9f MB |
4460 | /** |
4461 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4462 | * | |
4463 | * @regulator: Regulator to configure | |
9345dfb8 | 4464 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4465 | * |
4466 | * Allow the regulator to go into bypass mode if all other consumers | |
4467 | * for the regulator also enable bypass mode and the machine | |
4468 | * constraints allow this. Bypass mode means that the regulator is | |
4469 | * simply passing the input directly to the output with no regulation. | |
4470 | */ | |
4471 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4472 | { | |
4473 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4474 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4475 | int ret = 0; |
4476 | ||
4477 | if (!rdev->desc->ops->set_bypass) | |
4478 | return 0; | |
4479 | ||
8a34e979 | 4480 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4481 | return 0; |
4482 | ||
66cf9a7e | 4483 | regulator_lock(rdev); |
f59c8f9f MB |
4484 | |
4485 | if (enable && !regulator->bypass) { | |
4486 | rdev->bypass_count++; | |
4487 | ||
4488 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4489 | trace_regulator_bypass_enable(name); |
4490 | ||
f59c8f9f MB |
4491 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4492 | if (ret != 0) | |
4493 | rdev->bypass_count--; | |
48325655 CK |
4494 | else |
4495 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4496 | } |
4497 | ||
4498 | } else if (!enable && regulator->bypass) { | |
4499 | rdev->bypass_count--; | |
4500 | ||
4501 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4502 | trace_regulator_bypass_disable(name); |
4503 | ||
f59c8f9f MB |
4504 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4505 | if (ret != 0) | |
4506 | rdev->bypass_count++; | |
48325655 CK |
4507 | else |
4508 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4509 | } |
4510 | } | |
4511 | ||
4512 | if (ret == 0) | |
4513 | regulator->bypass = enable; | |
4514 | ||
66cf9a7e | 4515 | regulator_unlock(rdev); |
f59c8f9f MB |
4516 | |
4517 | return ret; | |
4518 | } | |
4519 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4520 | ||
414c70cb LG |
4521 | /** |
4522 | * regulator_register_notifier - register regulator event notifier | |
4523 | * @regulator: regulator source | |
69279fb9 | 4524 | * @nb: notifier block |
414c70cb LG |
4525 | * |
4526 | * Register notifier block to receive regulator events. | |
4527 | */ | |
4528 | int regulator_register_notifier(struct regulator *regulator, | |
4529 | struct notifier_block *nb) | |
4530 | { | |
4531 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4532 | nb); | |
4533 | } | |
4534 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4535 | ||
4536 | /** | |
4537 | * regulator_unregister_notifier - unregister regulator event notifier | |
4538 | * @regulator: regulator source | |
69279fb9 | 4539 | * @nb: notifier block |
414c70cb LG |
4540 | * |
4541 | * Unregister regulator event notifier block. | |
4542 | */ | |
4543 | int regulator_unregister_notifier(struct regulator *regulator, | |
4544 | struct notifier_block *nb) | |
4545 | { | |
4546 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4547 | nb); | |
4548 | } | |
4549 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4550 | ||
b136fb44 JC |
4551 | /* notify regulator consumers and downstream regulator consumers. |
4552 | * Note mutex must be held by caller. | |
4553 | */ | |
7179569a | 4554 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4555 | unsigned long event, void *data) |
4556 | { | |
414c70cb | 4557 | /* call rdev chain first */ |
7179569a | 4558 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4559 | } |
4560 | ||
4561 | /** | |
4562 | * regulator_bulk_get - get multiple regulator consumers | |
4563 | * | |
4564 | * @dev: Device to supply | |
4565 | * @num_consumers: Number of consumers to register | |
4566 | * @consumers: Configuration of consumers; clients are stored here. | |
4567 | * | |
4568 | * @return 0 on success, an errno on failure. | |
4569 | * | |
4570 | * This helper function allows drivers to get several regulator | |
4571 | * consumers in one operation. If any of the regulators cannot be | |
4572 | * acquired then any regulators that were allocated will be freed | |
4573 | * before returning to the caller. | |
4574 | */ | |
4575 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4576 | struct regulator_bulk_data *consumers) | |
4577 | { | |
4578 | int i; | |
4579 | int ret; | |
4580 | ||
4581 | for (i = 0; i < num_consumers; i++) | |
4582 | consumers[i].consumer = NULL; | |
4583 | ||
4584 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4585 | consumers[i].consumer = regulator_get(dev, |
4586 | consumers[i].supply); | |
414c70cb | 4587 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb LG |
4588 | ret = PTR_ERR(consumers[i].consumer); |
4589 | consumers[i].consumer = NULL; | |
4590 | goto err; | |
4591 | } | |
4592 | } | |
4593 | ||
4594 | return 0; | |
4595 | ||
4596 | err: | |
b9816363 | 4597 | if (ret != -EPROBE_DEFER) |
61aab5ad MM |
4598 | dev_err(dev, "Failed to get supply '%s': %pe\n", |
4599 | consumers[i].supply, ERR_PTR(ret)); | |
b9816363 JRO |
4600 | else |
4601 | dev_dbg(dev, "Failed to get supply '%s', deferring\n", | |
4602 | consumers[i].supply); | |
4603 | ||
b29c7690 | 4604 | while (--i >= 0) |
414c70cb LG |
4605 | regulator_put(consumers[i].consumer); |
4606 | ||
4607 | return ret; | |
4608 | } | |
4609 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4610 | ||
f21e0e81 MB |
4611 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4612 | { | |
4613 | struct regulator_bulk_data *bulk = data; | |
4614 | ||
4615 | bulk->ret = regulator_enable(bulk->consumer); | |
4616 | } | |
4617 | ||
414c70cb LG |
4618 | /** |
4619 | * regulator_bulk_enable - enable multiple regulator consumers | |
4620 | * | |
4621 | * @num_consumers: Number of consumers | |
4622 | * @consumers: Consumer data; clients are stored here. | |
4623 | * @return 0 on success, an errno on failure | |
4624 | * | |
4625 | * This convenience API allows consumers to enable multiple regulator | |
4626 | * clients in a single API call. If any consumers cannot be enabled | |
4627 | * then any others that were enabled will be disabled again prior to | |
4628 | * return. | |
4629 | */ | |
4630 | int regulator_bulk_enable(int num_consumers, | |
4631 | struct regulator_bulk_data *consumers) | |
4632 | { | |
2955b47d | 4633 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4634 | int i; |
f21e0e81 | 4635 | int ret = 0; |
414c70cb | 4636 | |
6492bc1b | 4637 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4638 | async_schedule_domain(regulator_bulk_enable_async, |
4639 | &consumers[i], &async_domain); | |
6492bc1b | 4640 | } |
f21e0e81 MB |
4641 | |
4642 | async_synchronize_full_domain(&async_domain); | |
4643 | ||
4644 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4645 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4646 | if (consumers[i].ret != 0) { |
4647 | ret = consumers[i].ret; | |
414c70cb | 4648 | goto err; |
f21e0e81 | 4649 | } |
414c70cb LG |
4650 | } |
4651 | ||
4652 | return 0; | |
4653 | ||
4654 | err: | |
fbe31057 AH |
4655 | for (i = 0; i < num_consumers; i++) { |
4656 | if (consumers[i].ret < 0) | |
61aab5ad MM |
4657 | pr_err("Failed to enable %s: %pe\n", consumers[i].supply, |
4658 | ERR_PTR(consumers[i].ret)); | |
fbe31057 AH |
4659 | else |
4660 | regulator_disable(consumers[i].consumer); | |
4661 | } | |
414c70cb LG |
4662 | |
4663 | return ret; | |
4664 | } | |
4665 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4666 | ||
4667 | /** | |
4668 | * regulator_bulk_disable - disable multiple regulator consumers | |
4669 | * | |
4670 | * @num_consumers: Number of consumers | |
4671 | * @consumers: Consumer data; clients are stored here. | |
4672 | * @return 0 on success, an errno on failure | |
4673 | * | |
4674 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4675 | * clients in a single API call. If any consumers cannot be disabled |
4676 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4677 | * return. |
4678 | */ | |
4679 | int regulator_bulk_disable(int num_consumers, | |
4680 | struct regulator_bulk_data *consumers) | |
4681 | { | |
4682 | int i; | |
01e86f49 | 4683 | int ret, r; |
414c70cb | 4684 | |
49e22632 | 4685 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4686 | ret = regulator_disable(consumers[i].consumer); |
4687 | if (ret != 0) | |
4688 | goto err; | |
4689 | } | |
4690 | ||
4691 | return 0; | |
4692 | ||
4693 | err: | |
61aab5ad | 4694 | pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret)); |
01e86f49 MB |
4695 | for (++i; i < num_consumers; ++i) { |
4696 | r = regulator_enable(consumers[i].consumer); | |
4697 | if (r != 0) | |
61aab5ad MM |
4698 | pr_err("Failed to re-enable %s: %pe\n", |
4699 | consumers[i].supply, ERR_PTR(r)); | |
01e86f49 | 4700 | } |
414c70cb LG |
4701 | |
4702 | return ret; | |
4703 | } | |
4704 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4705 | ||
e1de2f42 DK |
4706 | /** |
4707 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4708 | * | |
4709 | * @num_consumers: Number of consumers | |
4710 | * @consumers: Consumer data; clients are stored here. | |
4711 | * @return 0 on success, an errno on failure | |
4712 | * | |
4713 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4714 | * clients in a single API call. | |
4715 | * NOTE: This should be used for situations when device damage will | |
4716 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4717 | * Although regulator_force_disable function call for some consumers can | |
4718 | * return error numbers, the function is called for all consumers. | |
4719 | */ | |
4720 | int regulator_bulk_force_disable(int num_consumers, | |
4721 | struct regulator_bulk_data *consumers) | |
4722 | { | |
4723 | int i; | |
b8c77ff6 | 4724 | int ret = 0; |
e1de2f42 | 4725 | |
b8c77ff6 | 4726 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4727 | consumers[i].ret = |
4728 | regulator_force_disable(consumers[i].consumer); | |
4729 | ||
b8c77ff6 DT |
4730 | /* Store first error for reporting */ |
4731 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4732 | ret = consumers[i].ret; |
e1de2f42 DK |
4733 | } |
4734 | ||
e1de2f42 DK |
4735 | return ret; |
4736 | } | |
4737 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4738 | ||
414c70cb LG |
4739 | /** |
4740 | * regulator_bulk_free - free multiple regulator consumers | |
4741 | * | |
4742 | * @num_consumers: Number of consumers | |
4743 | * @consumers: Consumer data; clients are stored here. | |
4744 | * | |
4745 | * This convenience API allows consumers to free multiple regulator | |
4746 | * clients in a single API call. | |
4747 | */ | |
4748 | void regulator_bulk_free(int num_consumers, | |
4749 | struct regulator_bulk_data *consumers) | |
4750 | { | |
4751 | int i; | |
4752 | ||
4753 | for (i = 0; i < num_consumers; i++) { | |
4754 | regulator_put(consumers[i].consumer); | |
4755 | consumers[i].consumer = NULL; | |
4756 | } | |
4757 | } | |
4758 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4759 | ||
4760 | /** | |
4761 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4762 | * @rdev: regulator source |
414c70cb | 4763 | * @event: notifier block |
69279fb9 | 4764 | * @data: callback-specific data. |
414c70cb LG |
4765 | * |
4766 | * Called by regulator drivers to notify clients a regulator event has | |
3bca239d | 4767 | * occurred. |
414c70cb LG |
4768 | */ |
4769 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4770 | unsigned long event, void *data) | |
4771 | { | |
4772 | _notifier_call_chain(rdev, event, data); | |
4773 | return NOTIFY_DONE; | |
4774 | ||
4775 | } | |
4776 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4777 | ||
be721979 MB |
4778 | /** |
4779 | * regulator_mode_to_status - convert a regulator mode into a status | |
4780 | * | |
4781 | * @mode: Mode to convert | |
4782 | * | |
4783 | * Convert a regulator mode into a status. | |
4784 | */ | |
4785 | int regulator_mode_to_status(unsigned int mode) | |
4786 | { | |
4787 | switch (mode) { | |
4788 | case REGULATOR_MODE_FAST: | |
4789 | return REGULATOR_STATUS_FAST; | |
4790 | case REGULATOR_MODE_NORMAL: | |
4791 | return REGULATOR_STATUS_NORMAL; | |
4792 | case REGULATOR_MODE_IDLE: | |
4793 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4794 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4795 | return REGULATOR_STATUS_STANDBY; |
4796 | default: | |
1beaf762 | 4797 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4798 | } |
4799 | } | |
4800 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4801 | ||
39f802d6 TI |
4802 | static struct attribute *regulator_dev_attrs[] = { |
4803 | &dev_attr_name.attr, | |
4804 | &dev_attr_num_users.attr, | |
4805 | &dev_attr_type.attr, | |
4806 | &dev_attr_microvolts.attr, | |
4807 | &dev_attr_microamps.attr, | |
4808 | &dev_attr_opmode.attr, | |
4809 | &dev_attr_state.attr, | |
4810 | &dev_attr_status.attr, | |
4811 | &dev_attr_bypass.attr, | |
4812 | &dev_attr_requested_microamps.attr, | |
4813 | &dev_attr_min_microvolts.attr, | |
4814 | &dev_attr_max_microvolts.attr, | |
4815 | &dev_attr_min_microamps.attr, | |
4816 | &dev_attr_max_microamps.attr, | |
4817 | &dev_attr_suspend_standby_state.attr, | |
4818 | &dev_attr_suspend_mem_state.attr, | |
4819 | &dev_attr_suspend_disk_state.attr, | |
4820 | &dev_attr_suspend_standby_microvolts.attr, | |
4821 | &dev_attr_suspend_mem_microvolts.attr, | |
4822 | &dev_attr_suspend_disk_microvolts.attr, | |
4823 | &dev_attr_suspend_standby_mode.attr, | |
4824 | &dev_attr_suspend_mem_mode.attr, | |
4825 | &dev_attr_suspend_disk_mode.attr, | |
4826 | NULL | |
4827 | }; | |
4828 | ||
7ad68e2f DB |
4829 | /* |
4830 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4831 | * create attributes that can be meaningfully displayed. | |
4832 | */ | |
39f802d6 TI |
4833 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4834 | struct attribute *attr, int idx) | |
7ad68e2f | 4835 | { |
39f802d6 | 4836 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4837 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4838 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4839 | umode_t mode = attr->mode; |
4840 | ||
4841 | /* these three are always present */ | |
4842 | if (attr == &dev_attr_name.attr || | |
4843 | attr == &dev_attr_num_users.attr || | |
4844 | attr == &dev_attr_type.attr) | |
4845 | return mode; | |
7ad68e2f DB |
4846 | |
4847 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4848 | if (attr == &dev_attr_microvolts.attr) { |
4849 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4850 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4851 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4852 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4853 | return mode; | |
4854 | return 0; | |
f59c8f9f | 4855 | } |
7ad68e2f | 4856 | |
39f802d6 TI |
4857 | if (attr == &dev_attr_microamps.attr) |
4858 | return ops->get_current_limit ? mode : 0; | |
4859 | ||
4860 | if (attr == &dev_attr_opmode.attr) | |
4861 | return ops->get_mode ? mode : 0; | |
4862 | ||
4863 | if (attr == &dev_attr_state.attr) | |
4864 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4865 | ||
4866 | if (attr == &dev_attr_status.attr) | |
4867 | return ops->get_status ? mode : 0; | |
4868 | ||
4869 | if (attr == &dev_attr_bypass.attr) | |
4870 | return ops->get_bypass ? mode : 0; | |
4871 | ||
7ad68e2f | 4872 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4873 | if (attr == &dev_attr_min_microvolts.attr || |
4874 | attr == &dev_attr_max_microvolts.attr) | |
4875 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4876 | ||
4877 | if (attr == &dev_attr_min_microamps.attr || | |
4878 | attr == &dev_attr_max_microamps.attr) | |
4879 | return ops->set_current_limit ? mode : 0; | |
4880 | ||
4881 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4882 | attr == &dev_attr_suspend_mem_state.attr || | |
4883 | attr == &dev_attr_suspend_disk_state.attr) | |
4884 | return mode; | |
4885 | ||
4886 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4887 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4888 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4889 | return ops->set_suspend_voltage ? mode : 0; | |
4890 | ||
4891 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4892 | attr == &dev_attr_suspend_mem_mode.attr || | |
4893 | attr == &dev_attr_suspend_disk_mode.attr) | |
4894 | return ops->set_suspend_mode ? mode : 0; | |
4895 | ||
4896 | return mode; | |
4897 | } | |
4898 | ||
4899 | static const struct attribute_group regulator_dev_group = { | |
4900 | .attrs = regulator_dev_attrs, | |
4901 | .is_visible = regulator_attr_is_visible, | |
4902 | }; | |
4903 | ||
4904 | static const struct attribute_group *regulator_dev_groups[] = { | |
4905 | ®ulator_dev_group, | |
4906 | NULL | |
4907 | }; | |
7ad68e2f | 4908 | |
39f802d6 TI |
4909 | static void regulator_dev_release(struct device *dev) |
4910 | { | |
4911 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4912 | |
4913 | kfree(rdev->constraints); | |
4914 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4915 | kfree(rdev); |
7ad68e2f DB |
4916 | } |
4917 | ||
1130e5b3 MB |
4918 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4919 | { | |
a9eaa813 GR |
4920 | struct device *parent = rdev->dev.parent; |
4921 | const char *rname = rdev_get_name(rdev); | |
4922 | char name[NAME_MAX]; | |
4923 | ||
4924 | /* Avoid duplicate debugfs directory names */ | |
4925 | if (parent && rname == rdev->desc->name) { | |
4926 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4927 | rname); | |
4928 | rname = name; | |
4929 | } | |
4930 | ||
4931 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4932 | if (!rdev->debugfs) { |
1130e5b3 | 4933 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4934 | return; |
4935 | } | |
4936 | ||
4937 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4938 | &rdev->use_count); | |
4939 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4940 | &rdev->open_count); | |
f59c8f9f MB |
4941 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4942 | &rdev->bypass_count); | |
1130e5b3 MB |
4943 | } |
4944 | ||
5e3ca2b3 JMC |
4945 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4946 | { | |
7ddede6a JH |
4947 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4948 | ||
4949 | if (regulator_resolve_supply(rdev)) | |
4950 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4951 | ||
4952 | return 0; | |
5e3ca2b3 JMC |
4953 | } |
4954 | ||
d8ca7d18 DO |
4955 | int regulator_coupler_register(struct regulator_coupler *coupler) |
4956 | { | |
4957 | mutex_lock(®ulator_list_mutex); | |
4958 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
4959 | mutex_unlock(®ulator_list_mutex); | |
4960 | ||
4961 | return 0; | |
4962 | } | |
4963 | ||
4964 | static struct regulator_coupler * | |
4965 | regulator_find_coupler(struct regulator_dev *rdev) | |
4966 | { | |
4967 | struct regulator_coupler *coupler; | |
4968 | int err; | |
4969 | ||
4970 | /* | |
4971 | * Note that regulators are appended to the list and the generic | |
4972 | * coupler is registered first, hence it will be attached at last | |
4973 | * if nobody cared. | |
4974 | */ | |
4975 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
4976 | err = coupler->attach_regulator(coupler, rdev); | |
4977 | if (!err) { | |
4978 | if (!coupler->balance_voltage && | |
4979 | rdev->coupling_desc.n_coupled > 2) | |
4980 | goto err_unsupported; | |
4981 | ||
4982 | return coupler; | |
4983 | } | |
4984 | ||
4985 | if (err < 0) | |
4986 | return ERR_PTR(err); | |
4987 | ||
4988 | if (err == 1) | |
4989 | continue; | |
4990 | ||
4991 | break; | |
4992 | } | |
4993 | ||
4994 | return ERR_PTR(-EINVAL); | |
4995 | ||
4996 | err_unsupported: | |
4997 | if (coupler->detach_regulator) | |
4998 | coupler->detach_regulator(coupler, rdev); | |
4999 | ||
5000 | rdev_err(rdev, | |
5001 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
5002 | ||
5003 | return ERR_PTR(-EPERM); | |
5004 | } | |
5005 | ||
f9503385 | 5006 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 5007 | { |
d8ca7d18 | 5008 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
5009 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
5010 | int n_coupled = c_desc->n_coupled; | |
5011 | struct regulator_dev *c_rdev; | |
5012 | int i; | |
5013 | ||
5014 | for (i = 1; i < n_coupled; i++) { | |
5015 | /* already resolved */ | |
5016 | if (c_desc->coupled_rdevs[i]) | |
5017 | continue; | |
5018 | ||
5019 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
5020 | ||
f9503385 DO |
5021 | if (!c_rdev) |
5022 | continue; | |
d3d64537 | 5023 | |
d8ca7d18 DO |
5024 | if (c_rdev->coupling_desc.coupler != coupler) { |
5025 | rdev_err(rdev, "coupler mismatch with %s\n", | |
5026 | rdev_get_name(c_rdev)); | |
5027 | return; | |
5028 | } | |
5029 | ||
f9503385 DO |
5030 | c_desc->coupled_rdevs[i] = c_rdev; |
5031 | c_desc->n_resolved++; | |
d3d64537 | 5032 | |
f9503385 DO |
5033 | regulator_resolve_coupling(c_rdev); |
5034 | } | |
d3d64537 MP |
5035 | } |
5036 | ||
6303f3e7 | 5037 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 5038 | { |
d8ca7d18 | 5039 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
5040 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
5041 | struct regulator_dev *__c_rdev, *c_rdev; | |
5042 | unsigned int __n_coupled, n_coupled; | |
5043 | int i, k; | |
d8ca7d18 | 5044 | int err; |
d3d64537 | 5045 | |
6303f3e7 | 5046 | n_coupled = c_desc->n_coupled; |
d3d64537 | 5047 | |
6303f3e7 DO |
5048 | for (i = 1; i < n_coupled; i++) { |
5049 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 5050 | |
6303f3e7 DO |
5051 | if (!c_rdev) |
5052 | continue; | |
5053 | ||
5054 | regulator_lock(c_rdev); | |
5055 | ||
5056 | __c_desc = &c_rdev->coupling_desc; | |
5057 | __n_coupled = __c_desc->n_coupled; | |
5058 | ||
5059 | for (k = 1; k < __n_coupled; k++) { | |
5060 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
5061 | ||
5062 | if (__c_rdev == rdev) { | |
5063 | __c_desc->coupled_rdevs[k] = NULL; | |
5064 | __c_desc->n_resolved--; | |
5065 | break; | |
5066 | } | |
5067 | } | |
5068 | ||
5069 | regulator_unlock(c_rdev); | |
5070 | ||
5071 | c_desc->coupled_rdevs[i] = NULL; | |
5072 | c_desc->n_resolved--; | |
5073 | } | |
d8ca7d18 DO |
5074 | |
5075 | if (coupler && coupler->detach_regulator) { | |
5076 | err = coupler->detach_regulator(coupler, rdev); | |
5077 | if (err) | |
61aab5ad MM |
5078 | rdev_err(rdev, "failed to detach from coupler: %pe\n", |
5079 | ERR_PTR(err)); | |
d8ca7d18 DO |
5080 | } |
5081 | ||
5082 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5083 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5084 | } |
5085 | ||
f9503385 | 5086 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5087 | { |
7d819664 | 5088 | struct regulator_dev **coupled; |
d8ca7d18 | 5089 | int err, n_phandles; |
d3d64537 MP |
5090 | |
5091 | if (!IS_ENABLED(CONFIG_OF)) | |
5092 | n_phandles = 0; | |
5093 | else | |
5094 | n_phandles = of_get_n_coupled(rdev); | |
5095 | ||
7d819664 MM |
5096 | coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL); |
5097 | if (!coupled) | |
d8ca7d18 | 5098 | return -ENOMEM; |
d3d64537 | 5099 | |
7d819664 MM |
5100 | rdev->coupling_desc.coupled_rdevs = coupled; |
5101 | ||
d3d64537 MP |
5102 | /* |
5103 | * Every regulator should always have coupling descriptor filled with | |
5104 | * at least pointer to itself. | |
5105 | */ | |
5106 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5107 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5108 | rdev->coupling_desc.n_resolved++; | |
5109 | ||
5110 | /* regulator isn't coupled */ | |
5111 | if (n_phandles == 0) | |
5112 | return 0; | |
5113 | ||
d8ca7d18 | 5114 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5115 | return -EPERM; |
d3d64537 | 5116 | |
73a32129 | 5117 | mutex_lock(®ulator_list_mutex); |
d8ca7d18 | 5118 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
73a32129 MM |
5119 | mutex_unlock(®ulator_list_mutex); |
5120 | ||
d8ca7d18 DO |
5121 | if (IS_ERR(rdev->coupling_desc.coupler)) { |
5122 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
61aab5ad | 5123 | rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err)); |
d8ca7d18 | 5124 | return err; |
d3d64537 MP |
5125 | } |
5126 | ||
d8ca7d18 DO |
5127 | return 0; |
5128 | } | |
5129 | ||
5130 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5131 | struct regulator_dev *rdev) | |
5132 | { | |
5133 | if (rdev->coupling_desc.n_coupled > 2) { | |
5134 | rdev_err(rdev, | |
5135 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5136 | return -EPERM; |
d8ca7d18 | 5137 | } |
d3d64537 | 5138 | |
e381bfe4 DO |
5139 | if (!rdev->constraints->always_on) { |
5140 | rdev_err(rdev, | |
5141 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5142 | return -ENOTSUPP; | |
5143 | } | |
5144 | ||
d3d64537 MP |
5145 | return 0; |
5146 | } | |
5147 | ||
d8ca7d18 DO |
5148 | static struct regulator_coupler generic_regulator_coupler = { |
5149 | .attach_regulator = generic_coupler_attach, | |
5150 | }; | |
5151 | ||
414c70cb LG |
5152 | /** |
5153 | * regulator_register - register regulator | |
69279fb9 | 5154 | * @regulator_desc: regulator to register |
f47531b1 | 5155 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5156 | * |
5157 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5158 | * Returns a valid pointer to struct regulator_dev on success |
5159 | * or an ERR_PTR() on error. | |
414c70cb | 5160 | */ |
65f26846 MB |
5161 | struct regulator_dev * |
5162 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 5163 | const struct regulator_config *cfg) |
414c70cb | 5164 | { |
c172708d | 5165 | const struct regulator_init_data *init_data; |
1b3de223 | 5166 | struct regulator_config *config = NULL; |
72dca06f | 5167 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5168 | struct regulator_dev *rdev; |
0edb040d LW |
5169 | bool dangling_cfg_gpiod = false; |
5170 | bool dangling_of_gpiod = false; | |
32c8fad4 | 5171 | struct device *dev; |
a5766f11 | 5172 | int ret, i; |
414c70cb | 5173 | |
0edb040d | 5174 | if (cfg == NULL) |
414c70cb | 5175 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5176 | if (cfg->ena_gpiod) |
5177 | dangling_cfg_gpiod = true; | |
5178 | if (regulator_desc == NULL) { | |
5179 | ret = -EINVAL; | |
5180 | goto rinse; | |
5181 | } | |
414c70cb | 5182 | |
1b3de223 | 5183 | dev = cfg->dev; |
dcf70112 | 5184 | WARN_ON(!dev); |
32c8fad4 | 5185 | |
0edb040d LW |
5186 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5187 | ret = -EINVAL; | |
5188 | goto rinse; | |
5189 | } | |
414c70cb | 5190 | |
cd78dfc6 | 5191 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5192 | regulator_desc->type != REGULATOR_CURRENT) { |
5193 | ret = -EINVAL; | |
5194 | goto rinse; | |
5195 | } | |
414c70cb | 5196 | |
476c2d83 MB |
5197 | /* Only one of each should be implemented */ |
5198 | WARN_ON(regulator_desc->ops->get_voltage && | |
5199 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5200 | WARN_ON(regulator_desc->ops->set_voltage && |
5201 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5202 | |
5203 | /* If we're using selectors we must implement list_voltage. */ | |
5204 | if (regulator_desc->ops->get_voltage_sel && | |
5205 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5206 | ret = -EINVAL; |
5207 | goto rinse; | |
476c2d83 | 5208 | } |
e8eef82b MB |
5209 | if (regulator_desc->ops->set_voltage_sel && |
5210 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5211 | ret = -EINVAL; |
5212 | goto rinse; | |
e8eef82b | 5213 | } |
476c2d83 | 5214 | |
414c70cb | 5215 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5216 | if (rdev == NULL) { |
5217 | ret = -ENOMEM; | |
5218 | goto rinse; | |
5219 | } | |
d3c73156 | 5220 | device_initialize(&rdev->dev); |
414c70cb | 5221 | |
1b3de223 KK |
5222 | /* |
5223 | * Duplicate the config so the driver could override it after | |
5224 | * parsing init data. | |
5225 | */ | |
5226 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5227 | if (config == NULL) { | |
0edb040d | 5228 | ret = -ENOMEM; |
d3c73156 | 5229 | goto clean; |
1b3de223 KK |
5230 | } |
5231 | ||
bfa21a0d | 5232 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5233 | &rdev->dev.of_node); |
f8970d34 MF |
5234 | |
5235 | /* | |
5236 | * Sometimes not all resources are probed already so we need to take | |
5237 | * that into account. This happens most the time if the ena_gpiod comes | |
5238 | * from a gpio extender or something else. | |
5239 | */ | |
5240 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
f8970d34 | 5241 | ret = -EPROBE_DEFER; |
d3c73156 | 5242 | goto clean; |
f8970d34 MF |
5243 | } |
5244 | ||
0edb040d LW |
5245 | /* |
5246 | * We need to keep track of any GPIO descriptor coming from the | |
5247 | * device tree until we have handled it over to the core. If the | |
5248 | * config that was passed in to this function DOES NOT contain | |
5249 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5250 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5251 | * tree. |
5252 | */ | |
5253 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5254 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5255 | if (!init_data) { |
5256 | init_data = config->init_data; | |
5257 | rdev->dev.of_node = of_node_get(config->of_node); | |
5258 | } | |
5259 | ||
f8702f9e | 5260 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5261 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5262 | rdev->owner = regulator_desc->owner; |
5263 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5264 | if (config->regmap) |
5265 | rdev->regmap = config->regmap; | |
52b84dac | 5266 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5267 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5268 | else if (dev->parent) |
5269 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5270 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5271 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5272 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5273 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5274 | |
a5766f11 | 5275 | /* preform any regulator specific init */ |
9a8f5e07 | 5276 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5277 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
5278 | if (ret < 0) |
5279 | goto clean; | |
a5766f11 LG |
5280 | } |
5281 | ||
541d052d | 5282 | if (config->ena_gpiod) { |
daad134d KA |
5283 | ret = regulator_ena_gpio_request(rdev, config); |
5284 | if (ret != 0) { | |
61aab5ad MM |
5285 | rdev_err(rdev, "Failed to request enable GPIO: %pe\n", |
5286 | ERR_PTR(ret)); | |
32165230 | 5287 | goto clean; |
daad134d | 5288 | } |
0edb040d LW |
5289 | /* The regulator core took over the GPIO descriptor */ |
5290 | dangling_cfg_gpiod = false; | |
5291 | dangling_of_gpiod = false; | |
daad134d KA |
5292 | } |
5293 | ||
a5766f11 | 5294 | /* register with sysfs */ |
414c70cb | 5295 | rdev->dev.class = ®ulator_class; |
a5766f11 | 5296 | rdev->dev.parent = dev; |
72dca06f | 5297 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5298 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5299 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5300 | |
74f544c1 | 5301 | /* set regulator constraints */ |
9a8f5e07 | 5302 | if (init_data) |
57a6ad48 MM |
5303 | rdev->constraints = kmemdup(&init_data->constraints, |
5304 | sizeof(*rdev->constraints), | |
5305 | GFP_KERNEL); | |
5306 | else | |
5307 | rdev->constraints = kzalloc(sizeof(*rdev->constraints), | |
5308 | GFP_KERNEL); | |
5309 | if (!rdev->constraints) { | |
5310 | ret = -ENOMEM; | |
5311 | goto wash; | |
5312 | } | |
9a8f5e07 | 5313 | |
9a8f5e07 | 5314 | if (init_data && init_data->supply_regulator) |
6261b06d | 5315 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 5316 | else if (regulator_desc->supply_name) |
6261b06d | 5317 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 5318 | |
57a6ad48 | 5319 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5320 | if (ret == -EPROBE_DEFER) { |
5321 | /* Regulator might be in bypass mode and so needs its supply | |
69b8821e SK |
5322 | * to set the constraints |
5323 | */ | |
aea6cb99 MM |
5324 | /* FIXME: this currently triggers a chicken-and-egg problem |
5325 | * when creating -SUPPLY symlink in sysfs to a regulator | |
69b8821e SK |
5326 | * that is just being created |
5327 | */ | |
0917c9db MM |
5328 | rdev_dbg(rdev, "will resolve supply early: %s\n", |
5329 | rdev->supply_name); | |
aea6cb99 MM |
5330 | ret = regulator_resolve_supply(rdev); |
5331 | if (!ret) | |
57a6ad48 | 5332 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5333 | else |
5334 | rdev_dbg(rdev, "unable to resolve supply early: %pe\n", | |
5335 | ERR_PTR(ret)); | |
5336 | } | |
45389c47 JH |
5337 | if (ret < 0) |
5338 | goto wash; | |
5339 | ||
f9503385 DO |
5340 | ret = regulator_init_coupling(rdev); |
5341 | if (ret < 0) | |
d3d64537 MP |
5342 | goto wash; |
5343 | ||
a5766f11 | 5344 | /* add consumers devices */ |
9a8f5e07 MB |
5345 | if (init_data) { |
5346 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
5347 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5348 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5349 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
5350 | if (ret < 0) { |
5351 | dev_err(dev, "Failed to set supply %s\n", | |
5352 | init_data->consumer_supplies[i].supply); | |
5353 | goto unset_supplies; | |
5354 | } | |
23c2f041 | 5355 | } |
414c70cb | 5356 | } |
a5766f11 | 5357 | |
fd086045 MK |
5358 | if (!rdev->desc->ops->get_voltage && |
5359 | !rdev->desc->ops->list_voltage && | |
5360 | !rdev->desc->fixed_uV) | |
5361 | rdev->is_switch = true; | |
5362 | ||
9177514c VZ |
5363 | ret = device_add(&rdev->dev); |
5364 | if (ret != 0) | |
c438b9d0 | 5365 | goto unset_supplies; |
c438b9d0 | 5366 | |
1130e5b3 | 5367 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5368 | |
f9503385 DO |
5369 | /* try to resolve regulators coupling since a new one was registered */ |
5370 | mutex_lock(®ulator_list_mutex); | |
5371 | regulator_resolve_coupling(rdev); | |
5372 | mutex_unlock(®ulator_list_mutex); | |
5373 | ||
5e3ca2b3 JMC |
5374 | /* try to resolve regulators supply since a new one was registered */ |
5375 | class_for_each_device(®ulator_class, NULL, NULL, | |
5376 | regulator_register_resolve_supply); | |
1b3de223 | 5377 | kfree(config); |
414c70cb | 5378 | return rdev; |
4fca9545 | 5379 | |
d4033b54 | 5380 | unset_supplies: |
45389c47 | 5381 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5382 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5383 | regulator_remove_coupling(rdev); |
45389c47 | 5384 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5385 | wash: |
26c2c997 | 5386 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5387 | mutex_lock(®ulator_list_mutex); |
32165230 | 5388 | regulator_ena_gpio_free(rdev); |
45389c47 | 5389 | mutex_unlock(®ulator_list_mutex); |
4fca9545 | 5390 | clean: |
0edb040d LW |
5391 | if (dangling_of_gpiod) |
5392 | gpiod_put(config->ena_gpiod); | |
a2151374 | 5393 | kfree(config); |
d3c73156 | 5394 | put_device(&rdev->dev); |
0edb040d LW |
5395 | rinse: |
5396 | if (dangling_cfg_gpiod) | |
5397 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5398 | return ERR_PTR(ret); |
414c70cb LG |
5399 | } |
5400 | EXPORT_SYMBOL_GPL(regulator_register); | |
5401 | ||
5402 | /** | |
5403 | * regulator_unregister - unregister regulator | |
69279fb9 | 5404 | * @rdev: regulator to unregister |
414c70cb LG |
5405 | * |
5406 | * Called by regulator drivers to unregister a regulator. | |
5407 | */ | |
5408 | void regulator_unregister(struct regulator_dev *rdev) | |
5409 | { | |
5410 | if (rdev == NULL) | |
5411 | return; | |
5412 | ||
891636ea MB |
5413 | if (rdev->supply) { |
5414 | while (rdev->use_count--) | |
5415 | regulator_disable(rdev->supply); | |
e032b376 | 5416 | regulator_put(rdev->supply); |
891636ea | 5417 | } |
ff9b34b6 | 5418 | |
06377301 CK |
5419 | flush_work(&rdev->disable_work.work); |
5420 | ||
414c70cb | 5421 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5422 | |
1130e5b3 | 5423 | debugfs_remove_recursive(rdev->debugfs); |
6bf87d17 | 5424 | WARN_ON(rdev->open_count); |
6303f3e7 | 5425 | regulator_remove_coupling(rdev); |
0f1d747b | 5426 | unset_regulator_supplies(rdev); |
414c70cb | 5427 | list_del(&rdev->list); |
f19b00da | 5428 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5429 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5430 | |
5431 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5432 | } |
5433 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5434 | ||
f7efad10 | 5435 | #ifdef CONFIG_SUSPEND |
414c70cb | 5436 | /** |
0380cf7d | 5437 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5438 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5439 | * |
5440 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5441 | */ |
0380cf7d | 5442 | static int regulator_suspend(struct device *dev) |
414c70cb | 5443 | { |
cd7e36ab | 5444 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5445 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab | 5446 | int ret; |
0955f5be SB |
5447 | const struct regulator_state *rstate; |
5448 | ||
5449 | rstate = regulator_get_suspend_state_check(rdev, state); | |
5450 | if (!rstate) | |
5451 | return 0; | |
cd7e36ab MS |
5452 | |
5453 | regulator_lock(rdev); | |
0955f5be | 5454 | ret = __suspend_set_state(rdev, rstate); |
cd7e36ab | 5455 | regulator_unlock(rdev); |
414c70cb | 5456 | |
cd7e36ab | 5457 | return ret; |
85f3b431 | 5458 | } |
d3e4eccb | 5459 | |
cd7e36ab | 5460 | static int regulator_resume(struct device *dev) |
85f3b431 | 5461 | { |
cd7e36ab | 5462 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5463 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5464 | struct regulator_state *rstate; |
cd7e36ab | 5465 | int ret = 0; |
f7efad10 | 5466 | |
cd7e36ab | 5467 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5468 | if (rstate == NULL) |
35b5f14e | 5469 | return 0; |
414c70cb | 5470 | |
0955f5be SB |
5471 | /* Avoid grabbing the lock if we don't need to */ |
5472 | if (!rdev->desc->ops->resume) | |
5473 | return 0; | |
5474 | ||
66cf9a7e | 5475 | regulator_lock(rdev); |
85f3b431 | 5476 | |
0955f5be SB |
5477 | if (rstate->enabled == ENABLE_IN_SUSPEND || |
5478 | rstate->enabled == DISABLE_IN_SUSPEND) | |
0380cf7d | 5479 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5480 | |
66cf9a7e | 5481 | regulator_unlock(rdev); |
85f3b431 | 5482 | |
f7efad10 | 5483 | return ret; |
414c70cb | 5484 | } |
f7efad10 CZ |
5485 | #else /* !CONFIG_SUSPEND */ |
5486 | ||
0380cf7d | 5487 | #define regulator_suspend NULL |
5488 | #define regulator_resume NULL | |
f7efad10 CZ |
5489 | |
5490 | #endif /* !CONFIG_SUSPEND */ | |
5491 | ||
5492 | #ifdef CONFIG_PM | |
5493 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5494 | .suspend = regulator_suspend, |
5495 | .resume = regulator_resume, | |
f7efad10 CZ |
5496 | }; |
5497 | #endif | |
5498 | ||
285c22de | 5499 | struct class regulator_class = { |
f7efad10 CZ |
5500 | .name = "regulator", |
5501 | .dev_release = regulator_dev_release, | |
5502 | .dev_groups = regulator_dev_groups, | |
5503 | #ifdef CONFIG_PM | |
5504 | .pm = ®ulator_pm_ops, | |
5505 | #endif | |
5506 | }; | |
ca725561 MB |
5507 | /** |
5508 | * regulator_has_full_constraints - the system has fully specified constraints | |
5509 | * | |
5510 | * Calling this function will cause the regulator API to disable all | |
5511 | * regulators which have a zero use count and don't have an always_on | |
5512 | * constraint in a late_initcall. | |
5513 | * | |
5514 | * The intention is that this will become the default behaviour in a | |
5515 | * future kernel release so users are encouraged to use this facility | |
5516 | * now. | |
5517 | */ | |
5518 | void regulator_has_full_constraints(void) | |
5519 | { | |
5520 | has_full_constraints = 1; | |
5521 | } | |
5522 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5523 | ||
414c70cb LG |
5524 | /** |
5525 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5526 | * @rdev: regulator |
414c70cb LG |
5527 | * |
5528 | * Get rdev regulator driver private data. This call can be used in the | |
5529 | * regulator driver context. | |
5530 | */ | |
5531 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5532 | { | |
5533 | return rdev->reg_data; | |
5534 | } | |
5535 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5536 | ||
5537 | /** | |
5538 | * regulator_get_drvdata - get regulator driver data | |
5539 | * @regulator: regulator | |
5540 | * | |
5541 | * Get regulator driver private data. This call can be used in the consumer | |
5542 | * driver context when non API regulator specific functions need to be called. | |
5543 | */ | |
5544 | void *regulator_get_drvdata(struct regulator *regulator) | |
5545 | { | |
5546 | return regulator->rdev->reg_data; | |
5547 | } | |
5548 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5549 | ||
5550 | /** | |
5551 | * regulator_set_drvdata - set regulator driver data | |
5552 | * @regulator: regulator | |
5553 | * @data: data | |
5554 | */ | |
5555 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5556 | { | |
5557 | regulator->rdev->reg_data = data; | |
5558 | } | |
5559 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5560 | ||
5561 | /** | |
d73e873b | 5562 | * rdev_get_id - get regulator ID |
69279fb9 | 5563 | * @rdev: regulator |
414c70cb LG |
5564 | */ |
5565 | int rdev_get_id(struct regulator_dev *rdev) | |
5566 | { | |
5567 | return rdev->desc->id; | |
5568 | } | |
5569 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5570 | ||
a5766f11 LG |
5571 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5572 | { | |
5573 | return &rdev->dev; | |
5574 | } | |
5575 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5576 | ||
03c87b95 BG |
5577 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5578 | { | |
5579 | return rdev->regmap; | |
5580 | } | |
5581 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5582 | ||
a5766f11 LG |
5583 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5584 | { | |
5585 | return reg_init_data->driver_data; | |
5586 | } | |
5587 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5588 | ||
ba55a974 | 5589 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5590 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5591 | { |
ba55a974 MB |
5592 | struct regulator_map *map; |
5593 | ||
ba55a974 | 5594 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5595 | seq_printf(sf, "%s -> %s.%s\n", |
5596 | rdev_get_name(map->regulator), map->dev_name, | |
5597 | map->supply); | |
ba55a974 MB |
5598 | } |
5599 | ||
dbc55955 HZ |
5600 | return 0; |
5601 | } | |
3e60b4fc | 5602 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5603 | |
85f3b431 TV |
5604 | struct summary_data { |
5605 | struct seq_file *s; | |
5606 | struct regulator_dev *parent; | |
5607 | int level; | |
5608 | }; | |
5609 | ||
5610 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5611 | struct regulator_dev *rdev, | |
5612 | int level); | |
5613 | ||
5614 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5615 | { | |
5616 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5617 | struct summary_data *summary_data = data; | |
5618 | ||
5619 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5620 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5621 | summary_data->level + 1); | |
5622 | ||
5623 | return 0; | |
5624 | } | |
5625 | ||
7c225ec9 HS |
5626 | static void regulator_summary_show_subtree(struct seq_file *s, |
5627 | struct regulator_dev *rdev, | |
5628 | int level) | |
5629 | { | |
7c225ec9 HS |
5630 | struct regulation_constraints *c; |
5631 | struct regulator *consumer; | |
85f3b431 | 5632 | struct summary_data summary_data; |
7e4d9683 | 5633 | unsigned int opmode; |
7c225ec9 HS |
5634 | |
5635 | if (!rdev) | |
5636 | return; | |
5637 | ||
7e4d9683 | 5638 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5639 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5640 | level * 3 + 1, "", |
5641 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5642 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5643 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5644 | |
d22b85a1 | 5645 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5646 | seq_printf(s, "%5dmA ", |
5647 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5648 | |
5649 | c = rdev->constraints; | |
5650 | if (c) { | |
5651 | switch (rdev->desc->type) { | |
5652 | case REGULATOR_VOLTAGE: | |
5653 | seq_printf(s, "%5dmV %5dmV ", | |
5654 | c->min_uV / 1000, c->max_uV / 1000); | |
5655 | break; | |
5656 | case REGULATOR_CURRENT: | |
5657 | seq_printf(s, "%5dmA %5dmA ", | |
5658 | c->min_uA / 1000, c->max_uA / 1000); | |
5659 | break; | |
5660 | } | |
5661 | } | |
5662 | ||
5663 | seq_puts(s, "\n"); | |
5664 | ||
5665 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5666 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5667 | continue; |
5668 | ||
5669 | seq_printf(s, "%*s%-*s ", | |
5670 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5671 | 30 - (level + 1) * 3, |
6b576eb0 | 5672 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5673 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5674 | |
5675 | switch (rdev->desc->type) { | |
5676 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5677 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5678 | consumer->enable_count, | |
7d3827b5 | 5679 | consumer->uA_load / 1000, |
5451781d DA |
5680 | consumer->uA_load && !consumer->enable_count ? |
5681 | '*' : ' ', | |
c360a6df CZ |
5682 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5683 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5684 | break; |
5685 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5686 | break; |
5687 | } | |
5688 | ||
5689 | seq_puts(s, "\n"); | |
5690 | } | |
5691 | ||
85f3b431 TV |
5692 | summary_data.s = s; |
5693 | summary_data.level = level; | |
5694 | summary_data.parent = rdev; | |
7c225ec9 | 5695 | |
85f3b431 TV |
5696 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5697 | regulator_summary_show_children); | |
f8702f9e DO |
5698 | } |
5699 | ||
5700 | struct summary_lock_data { | |
5701 | struct ww_acquire_ctx *ww_ctx; | |
5702 | struct regulator_dev **new_contended_rdev; | |
5703 | struct regulator_dev **old_contended_rdev; | |
5704 | }; | |
5705 | ||
5706 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5707 | { | |
5708 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5709 | struct summary_lock_data *lock_data = data; | |
5710 | int ret = 0; | |
5711 | ||
5712 | if (rdev != *lock_data->old_contended_rdev) { | |
5713 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5714 | ||
5715 | if (ret == -EDEADLK) | |
5716 | *lock_data->new_contended_rdev = rdev; | |
5717 | else | |
5718 | WARN_ON_ONCE(ret); | |
5719 | } else { | |
5720 | *lock_data->old_contended_rdev = NULL; | |
5721 | } | |
5722 | ||
5723 | return ret; | |
5724 | } | |
5725 | ||
5726 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5727 | { | |
5728 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5729 | struct summary_lock_data *lock_data = data; | |
5730 | ||
5731 | if (lock_data) { | |
5732 | if (rdev == *lock_data->new_contended_rdev) | |
5733 | return -EDEADLK; | |
5734 | } | |
7e4d9683 DA |
5735 | |
5736 | regulator_unlock(rdev); | |
f8702f9e DO |
5737 | |
5738 | return 0; | |
5739 | } | |
5740 | ||
5741 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5742 | struct regulator_dev **new_contended_rdev, | |
5743 | struct regulator_dev **old_contended_rdev) | |
5744 | { | |
5745 | struct summary_lock_data lock_data; | |
5746 | int ret; | |
5747 | ||
5748 | lock_data.ww_ctx = ww_ctx; | |
5749 | lock_data.new_contended_rdev = new_contended_rdev; | |
5750 | lock_data.old_contended_rdev = old_contended_rdev; | |
5751 | ||
5752 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5753 | regulator_summary_lock_one); | |
5754 | if (ret) | |
5755 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5756 | regulator_summary_unlock_one); | |
5757 | ||
5758 | return ret; | |
5759 | } | |
5760 | ||
5761 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5762 | { | |
5763 | struct regulator_dev *new_contended_rdev = NULL; | |
5764 | struct regulator_dev *old_contended_rdev = NULL; | |
5765 | int err; | |
5766 | ||
ff9b34b6 DO |
5767 | mutex_lock(®ulator_list_mutex); |
5768 | ||
f8702f9e DO |
5769 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5770 | ||
5771 | do { | |
5772 | if (new_contended_rdev) { | |
5773 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5774 | old_contended_rdev = new_contended_rdev; | |
5775 | old_contended_rdev->ref_cnt++; | |
5776 | } | |
5777 | ||
5778 | err = regulator_summary_lock_all(ww_ctx, | |
5779 | &new_contended_rdev, | |
5780 | &old_contended_rdev); | |
5781 | ||
5782 | if (old_contended_rdev) | |
5783 | regulator_unlock(old_contended_rdev); | |
5784 | ||
5785 | } while (err == -EDEADLK); | |
5786 | ||
5787 | ww_acquire_done(ww_ctx); | |
5788 | } | |
5789 | ||
5790 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5791 | { | |
5792 | class_for_each_device(®ulator_class, NULL, NULL, | |
5793 | regulator_summary_unlock_one); | |
5794 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5795 | |
5796 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5797 | } |
5798 | ||
85f3b431 | 5799 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5800 | { |
85f3b431 TV |
5801 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5802 | struct seq_file *s = data; | |
7c225ec9 | 5803 | |
85f3b431 TV |
5804 | if (!rdev->supply) |
5805 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5806 | |
85f3b431 TV |
5807 | return 0; |
5808 | } | |
7c225ec9 | 5809 | |
85f3b431 TV |
5810 | static int regulator_summary_show(struct seq_file *s, void *data) |
5811 | { | |
f8702f9e DO |
5812 | struct ww_acquire_ctx ww_ctx; |
5813 | ||
01de19d0 DA |
5814 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5815 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5816 | |
f8702f9e DO |
5817 | regulator_summary_lock(&ww_ctx); |
5818 | ||
85f3b431 TV |
5819 | class_for_each_device(®ulator_class, NULL, s, |
5820 | regulator_summary_show_roots); | |
7c225ec9 | 5821 | |
f8702f9e DO |
5822 | regulator_summary_unlock(&ww_ctx); |
5823 | ||
7c225ec9 HS |
5824 | return 0; |
5825 | } | |
3e60b4fc YL |
5826 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5827 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5828 | |
414c70cb LG |
5829 | static int __init regulator_init(void) |
5830 | { | |
34abbd68 MB |
5831 | int ret; |
5832 | ||
34abbd68 MB |
5833 | ret = class_register(®ulator_class); |
5834 | ||
1130e5b3 | 5835 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5836 | if (!debugfs_root) |
1130e5b3 | 5837 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5838 | |
3e60b4fc | 5839 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5840 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5841 | &supply_map_fops); | |
1130e5b3 | 5842 | |
7c225ec9 | 5843 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5844 | NULL, ®ulator_summary_fops); |
3e60b4fc | 5845 | #endif |
34abbd68 MB |
5846 | regulator_dummy_init(); |
5847 | ||
d8ca7d18 DO |
5848 | regulator_coupler_register(&generic_regulator_coupler); |
5849 | ||
34abbd68 | 5850 | return ret; |
414c70cb LG |
5851 | } |
5852 | ||
5853 | /* init early to allow our consumers to complete system booting */ | |
5854 | core_initcall(regulator_init); | |
ca725561 | 5855 | |
55576cf1 | 5856 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5857 | { |
609ca5f3 MB |
5858 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5859 | const struct regulator_ops *ops = rdev->desc->ops; | |
5860 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5861 | int enabled, ret; |
ca725561 | 5862 | |
609ca5f3 MB |
5863 | if (c && c->always_on) |
5864 | return 0; | |
5865 | ||
8a34e979 | 5866 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5867 | return 0; |
5868 | ||
66cf9a7e | 5869 | regulator_lock(rdev); |
609ca5f3 MB |
5870 | |
5871 | if (rdev->use_count) | |
5872 | goto unlock; | |
5873 | ||
c088a498 | 5874 | /* If we can't read the status assume it's always on. */ |
609ca5f3 MB |
5875 | if (ops->is_enabled) |
5876 | enabled = ops->is_enabled(rdev); | |
5877 | else | |
5878 | enabled = 1; | |
5879 | ||
c088a498 PHS |
5880 | /* But if reading the status failed, assume that it's off. */ |
5881 | if (enabled <= 0) | |
609ca5f3 MB |
5882 | goto unlock; |
5883 | ||
5884 | if (have_full_constraints()) { | |
5885 | /* We log since this may kill the system if it goes | |
69b8821e SK |
5886 | * wrong. |
5887 | */ | |
609ca5f3 MB |
5888 | rdev_info(rdev, "disabling\n"); |
5889 | ret = _regulator_do_disable(rdev); | |
5890 | if (ret != 0) | |
61aab5ad | 5891 | rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret)); |
609ca5f3 MB |
5892 | } else { |
5893 | /* The intention is that in future we will | |
5894 | * assume that full constraints are provided | |
5895 | * so warn even if we aren't going to do | |
5896 | * anything here. | |
5897 | */ | |
5898 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5899 | } | |
5900 | ||
5901 | unlock: | |
66cf9a7e | 5902 | regulator_unlock(rdev); |
609ca5f3 MB |
5903 | |
5904 | return 0; | |
5905 | } | |
5906 | ||
55576cf1 | 5907 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 5908 | { |
3827b64d JMC |
5909 | /* |
5910 | * Regulators may had failed to resolve their input supplies | |
5911 | * when were registered, either because the input supply was | |
5912 | * not registered yet or because its parent device was not | |
5913 | * bound yet. So attempt to resolve the input supplies for | |
5914 | * pending regulators before trying to disable unused ones. | |
5915 | */ | |
5916 | class_for_each_device(®ulator_class, NULL, NULL, | |
5917 | regulator_register_resolve_supply); | |
5918 | ||
ca725561 | 5919 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5920 | * we have permission to change the status for and which are |
5921 | * not in use or always_on. This is effectively the default | |
5922 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5923 | */ |
609ca5f3 MB |
5924 | class_for_each_device(®ulator_class, NULL, NULL, |
5925 | regulator_late_cleanup); | |
55576cf1 MB |
5926 | } |
5927 | ||
5928 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
5929 | regulator_init_complete_work_function); | |
5930 | ||
5931 | static int __init regulator_init_complete(void) | |
5932 | { | |
5933 | /* | |
5934 | * Since DT doesn't provide an idiomatic mechanism for | |
5935 | * enabling full constraints and since it's much more natural | |
5936 | * with DT to provide them just assume that a DT enabled | |
5937 | * system has full constraints. | |
5938 | */ | |
5939 | if (of_have_populated_dt()) | |
5940 | has_full_constraints = true; | |
5941 | ||
5942 | /* | |
2a15483b JS |
5943 | * We punt completion for an arbitrary amount of time since |
5944 | * systems like distros will load many drivers from userspace | |
5945 | * so consumers might not always be ready yet, this is | |
5946 | * particularly an issue with laptops where this might bounce | |
5947 | * the display off then on. Ideally we'd get a notification | |
5948 | * from userspace when this happens but we don't so just wait | |
5949 | * a bit and hope we waited long enough. It'd be better if | |
5950 | * we'd only do this on systems that need it, and a kernel | |
5951 | * command line option might be useful. | |
55576cf1 | 5952 | */ |
2a15483b JS |
5953 | schedule_delayed_work(®ulator_init_complete_work, |
5954 | msecs_to_jiffies(30000)); | |
ca725561 MB |
5955 | |
5956 | return 0; | |
5957 | } | |
fd482a3e | 5958 | late_initcall_sync(regulator_init_complete); |