Commit | Line | Data |
---|---|---|
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 | ||
a277a262 Y |
584 | static ssize_t microvolts_show(struct device *dev, |
585 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } |
a277a262 | 598 | static DEVICE_ATTR_RO(microvolts); |
414c70cb | 599 | |
a277a262 Y |
600 | static ssize_t microamps_show(struct device *dev, |
601 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 607 | static DEVICE_ATTR_RO(microamps); |
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 | ||
a277a262 Y |
638 | static ssize_t 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 | } | |
a277a262 | 645 | static DEVICE_ATTR_RO(opmode); |
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 | ||
a277a262 Y |
657 | static ssize_t state_show(struct device *dev, |
658 | struct device_attribute *attr, char *buf) | |
4fca9545 DB |
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 | } |
a277a262 | 669 | static DEVICE_ATTR_RO(state); |
4fca9545 | 670 | |
a277a262 Y |
671 | static ssize_t status_show(struct device *dev, |
672 | struct device_attribute *attr, char *buf) | |
853116a1 DB |
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 | } | |
a277a262 | 716 | static DEVICE_ATTR_RO(status); |
853116a1 | 717 | |
a277a262 Y |
718 | static ssize_t min_microamps_show(struct device *dev, |
719 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 728 | static DEVICE_ATTR_RO(min_microamps); |
414c70cb | 729 | |
a277a262 Y |
730 | static ssize_t max_microamps_show(struct device *dev, |
731 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 740 | static DEVICE_ATTR_RO(max_microamps); |
414c70cb | 741 | |
a277a262 Y |
742 | static ssize_t min_microvolts_show(struct device *dev, |
743 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 752 | static DEVICE_ATTR_RO(min_microvolts); |
414c70cb | 753 | |
a277a262 Y |
754 | static ssize_t max_microvolts_show(struct device *dev, |
755 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 764 | static DEVICE_ATTR_RO(max_microvolts); |
414c70cb | 765 | |
a277a262 Y |
766 | static ssize_t requested_microamps_show(struct device *dev, |
767 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 781 | static DEVICE_ATTR_RO(requested_microamps); |
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 | 805 | |
a277a262 Y |
806 | static ssize_t suspend_mem_microvolts_show(struct device *dev, |
807 | struct device_attribute *attr, char *buf) | |
414c70cb | 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 | } | |
a277a262 | 813 | static DEVICE_ATTR_RO(suspend_mem_microvolts); |
414c70cb | 814 | |
a277a262 Y |
815 | static ssize_t suspend_disk_microvolts_show(struct device *dev, |
816 | struct device_attribute *attr, char *buf) | |
414c70cb | 817 | { |
a5766f11 | 818 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 819 | |
414c70cb LG |
820 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
821 | } | |
a277a262 | 822 | static DEVICE_ATTR_RO(suspend_disk_microvolts); |
414c70cb | 823 | |
a277a262 Y |
824 | static ssize_t suspend_standby_microvolts_show(struct device *dev, |
825 | struct device_attribute *attr, char *buf) | |
414c70cb | 826 | { |
a5766f11 | 827 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 828 | |
414c70cb LG |
829 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
830 | } | |
a277a262 | 831 | static DEVICE_ATTR_RO(suspend_standby_microvolts); |
414c70cb | 832 | |
a277a262 Y |
833 | static ssize_t suspend_mem_mode_show(struct device *dev, |
834 | struct device_attribute *attr, char *buf) | |
414c70cb | 835 | { |
a5766f11 | 836 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 837 | |
4fca9545 DB |
838 | return regulator_print_opmode(buf, |
839 | rdev->constraints->state_mem.mode); | |
414c70cb | 840 | } |
a277a262 | 841 | static DEVICE_ATTR_RO(suspend_mem_mode); |
414c70cb | 842 | |
a277a262 Y |
843 | static ssize_t suspend_disk_mode_show(struct device *dev, |
844 | struct device_attribute *attr, char *buf) | |
414c70cb | 845 | { |
a5766f11 | 846 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 847 | |
4fca9545 DB |
848 | return regulator_print_opmode(buf, |
849 | rdev->constraints->state_disk.mode); | |
414c70cb | 850 | } |
a277a262 | 851 | static DEVICE_ATTR_RO(suspend_disk_mode); |
414c70cb | 852 | |
a277a262 Y |
853 | static ssize_t suspend_standby_mode_show(struct device *dev, |
854 | struct device_attribute *attr, char *buf) | |
414c70cb | 855 | { |
a5766f11 | 856 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 857 | |
4fca9545 DB |
858 | return regulator_print_opmode(buf, |
859 | rdev->constraints->state_standby.mode); | |
414c70cb | 860 | } |
a277a262 | 861 | static DEVICE_ATTR_RO(suspend_standby_mode); |
414c70cb | 862 | |
a277a262 Y |
863 | static ssize_t suspend_mem_state_show(struct device *dev, |
864 | struct device_attribute *attr, char *buf) | |
414c70cb | 865 | { |
a5766f11 | 866 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 867 | |
4fca9545 DB |
868 | return regulator_print_state(buf, |
869 | rdev->constraints->state_mem.enabled); | |
414c70cb | 870 | } |
a277a262 | 871 | static DEVICE_ATTR_RO(suspend_mem_state); |
414c70cb | 872 | |
a277a262 Y |
873 | static ssize_t suspend_disk_state_show(struct device *dev, |
874 | struct device_attribute *attr, char *buf) | |
414c70cb | 875 | { |
a5766f11 | 876 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 877 | |
4fca9545 DB |
878 | return regulator_print_state(buf, |
879 | rdev->constraints->state_disk.enabled); | |
414c70cb | 880 | } |
a277a262 | 881 | static DEVICE_ATTR_RO(suspend_disk_state); |
414c70cb | 882 | |
a277a262 Y |
883 | static ssize_t suspend_standby_state_show(struct device *dev, |
884 | struct device_attribute *attr, char *buf) | |
414c70cb | 885 | { |
a5766f11 | 886 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 887 | |
4fca9545 DB |
888 | return regulator_print_state(buf, |
889 | rdev->constraints->state_standby.enabled); | |
414c70cb | 890 | } |
a277a262 | 891 | static DEVICE_ATTR_RO(suspend_standby_state); |
7ad68e2f | 892 | |
a277a262 Y |
893 | static ssize_t bypass_show(struct device *dev, |
894 | struct device_attribute *attr, char *buf) | |
f59c8f9f MB |
895 | { |
896 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
897 | const char *report; | |
898 | bool bypass; | |
899 | int ret; | |
900 | ||
901 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
902 | ||
903 | if (ret != 0) | |
904 | report = "unknown"; | |
905 | else if (bypass) | |
906 | report = "enabled"; | |
907 | else | |
908 | report = "disabled"; | |
909 | ||
910 | return sprintf(buf, "%s\n", report); | |
911 | } | |
a277a262 | 912 | static DEVICE_ATTR_RO(bypass); |
bc558a60 | 913 | |
414c70cb | 914 | /* Calculate the new optimum regulator operating mode based on the new total |
69b8821e SK |
915 | * consumer load. All locks held by caller |
916 | */ | |
8460ef38 | 917 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
918 | { |
919 | struct regulator *sibling; | |
920 | int current_uA = 0, output_uV, input_uV, err; | |
921 | unsigned int mode; | |
922 | ||
8460ef38 BA |
923 | /* |
924 | * first check to see if we can set modes at all, otherwise just | |
925 | * tell the consumer everything is OK. | |
926 | */ | |
74a569ee MG |
927 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
928 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 929 | return 0; |
74a569ee | 930 | } |
8460ef38 | 931 | |
8f4490e0 BA |
932 | if (!rdev->desc->ops->get_optimum_mode && |
933 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
934 | return 0; |
935 | ||
8f4490e0 BA |
936 | if (!rdev->desc->ops->set_mode && |
937 | !rdev->desc->ops->set_load) | |
8460ef38 | 938 | return -EINVAL; |
414c70cb | 939 | |
414c70cb | 940 | /* calc total requested load */ |
5451781d DA |
941 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
942 | if (sibling->enable_count) | |
943 | current_uA += sibling->uA_load; | |
944 | } | |
414c70cb | 945 | |
22a10bca SB |
946 | current_uA += rdev->constraints->system_load; |
947 | ||
8f4490e0 BA |
948 | if (rdev->desc->ops->set_load) { |
949 | /* set the optimum mode for our new total regulator load */ | |
950 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
951 | if (err < 0) | |
61aab5ad MM |
952 | rdev_err(rdev, "failed to set load %d: %pe\n", |
953 | current_uA, ERR_PTR(err)); | |
8f4490e0 | 954 | } else { |
57776617 | 955 | /* get output voltage */ |
d22b85a1 | 956 | output_uV = regulator_get_voltage_rdev(rdev); |
57776617 JP |
957 | if (output_uV <= 0) { |
958 | rdev_err(rdev, "invalid output voltage found\n"); | |
959 | return -EINVAL; | |
960 | } | |
961 | ||
962 | /* get input voltage */ | |
963 | input_uV = 0; | |
964 | if (rdev->supply) | |
965 | input_uV = regulator_get_voltage(rdev->supply); | |
966 | if (input_uV <= 0) | |
967 | input_uV = rdev->constraints->input_uV; | |
968 | if (input_uV <= 0) { | |
969 | rdev_err(rdev, "invalid input voltage found\n"); | |
970 | return -EINVAL; | |
971 | } | |
972 | ||
8f4490e0 BA |
973 | /* now get the optimum mode for our new total regulator load */ |
974 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
975 | output_uV, current_uA); | |
976 | ||
977 | /* check the new mode is allowed */ | |
978 | err = regulator_mode_constrain(rdev, &mode); | |
979 | if (err < 0) { | |
61aab5ad MM |
980 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n", |
981 | current_uA, input_uV, output_uV, ERR_PTR(err)); | |
8f4490e0 BA |
982 | return err; |
983 | } | |
414c70cb | 984 | |
8f4490e0 BA |
985 | err = rdev->desc->ops->set_mode(rdev, mode); |
986 | if (err < 0) | |
61aab5ad MM |
987 | rdev_err(rdev, "failed to set optimum mode %x: %pe\n", |
988 | mode, ERR_PTR(err)); | |
8460ef38 BA |
989 | } |
990 | ||
8460ef38 | 991 | return err; |
414c70cb LG |
992 | } |
993 | ||
0955f5be SB |
994 | static int __suspend_set_state(struct regulator_dev *rdev, |
995 | const struct regulator_state *rstate) | |
414c70cb LG |
996 | { |
997 | int ret = 0; | |
638f85c5 | 998 | |
72069f99 CZ |
999 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1000 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1001 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1002 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1003 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1004 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1005 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1006 | ret = 0; | |
1007 | ||
414c70cb | 1008 | if (ret < 0) { |
61aab5ad | 1009 | rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1010 | return ret; |
1011 | } | |
1012 | ||
1013 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1014 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1015 | if (ret < 0) { | |
61aab5ad | 1016 | rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1017 | return ret; |
1018 | } | |
1019 | } | |
1020 | ||
1021 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1022 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1023 | if (ret < 0) { | |
61aab5ad | 1024 | rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1025 | return ret; |
1026 | } | |
1027 | } | |
414c70cb | 1028 | |
f7efad10 | 1029 | return ret; |
414c70cb LG |
1030 | } |
1031 | ||
0955f5be SB |
1032 | static int suspend_set_initial_state(struct regulator_dev *rdev) |
1033 | { | |
1034 | const struct regulator_state *rstate; | |
1035 | ||
1036 | rstate = regulator_get_suspend_state_check(rdev, | |
1037 | rdev->constraints->initial_state); | |
1038 | if (!rstate) | |
1039 | return 0; | |
1040 | ||
1041 | return __suspend_set_state(rdev, rstate); | |
1042 | } | |
1043 | ||
c845f21a GU |
1044 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
1045 | static void print_constraints_debug(struct regulator_dev *rdev) | |
414c70cb LG |
1046 | { |
1047 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1048 | char buf[160] = ""; |
5751a99f | 1049 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1050 | int count = 0; |
1051 | int ret; | |
414c70cb | 1052 | |
8f031b48 | 1053 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1054 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1055 | count += scnprintf(buf + count, len - count, "%d mV ", |
1056 | constraints->min_uV / 1000); | |
414c70cb | 1057 | else |
5751a99f SW |
1058 | count += scnprintf(buf + count, len - count, |
1059 | "%d <--> %d mV ", | |
1060 | constraints->min_uV / 1000, | |
1061 | constraints->max_uV / 1000); | |
8f031b48 MB |
1062 | } |
1063 | ||
1064 | if (!constraints->min_uV || | |
1065 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1066 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1067 | if (ret > 0) |
5751a99f SW |
1068 | count += scnprintf(buf + count, len - count, |
1069 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1070 | } |
1071 | ||
bf5892a8 | 1072 | if (constraints->uV_offset) |
5751a99f SW |
1073 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1074 | constraints->uV_offset / 1000); | |
bf5892a8 | 1075 | |
8f031b48 | 1076 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1077 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1078 | count += scnprintf(buf + count, len - count, "%d mA ", |
1079 | constraints->min_uA / 1000); | |
414c70cb | 1080 | else |
5751a99f SW |
1081 | count += scnprintf(buf + count, len - count, |
1082 | "%d <--> %d mA ", | |
1083 | constraints->min_uA / 1000, | |
1084 | constraints->max_uA / 1000); | |
8f031b48 MB |
1085 | } |
1086 | ||
1087 | if (!constraints->min_uA || | |
1088 | constraints->min_uA != constraints->max_uA) { | |
1089 | ret = _regulator_get_current_limit(rdev); | |
1090 | if (ret > 0) | |
5751a99f SW |
1091 | count += scnprintf(buf + count, len - count, |
1092 | "at %d mA ", ret / 1000); | |
414c70cb | 1093 | } |
8f031b48 | 1094 | |
414c70cb | 1095 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1096 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1097 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1098 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1099 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1100 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1101 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
99ad5f6e | 1102 | count += scnprintf(buf + count, len - count, "standby "); |
414c70cb | 1103 | |
215b8b05 | 1104 | if (!count) |
99ad5f6e MM |
1105 | count = scnprintf(buf, len, "no parameters"); |
1106 | else | |
1107 | --count; | |
1108 | ||
1109 | count += scnprintf(buf + count, len - count, ", %s", | |
1110 | _regulator_is_enabled(rdev) ? "enabled" : "disabled"); | |
215b8b05 | 1111 | |
194dbaef | 1112 | rdev_dbg(rdev, "%s\n", buf); |
c845f21a GU |
1113 | } |
1114 | #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1115 | static inline void print_constraints_debug(struct regulator_dev *rdev) {} | |
1116 | #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1117 | ||
1118 | static void print_constraints(struct regulator_dev *rdev) | |
1119 | { | |
1120 | struct regulation_constraints *constraints = rdev->constraints; | |
1121 | ||
1122 | print_constraints_debug(rdev); | |
4a682922 MB |
1123 | |
1124 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1125 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1126 | rdev_warn(rdev, |
1127 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1128 | } |
1129 | ||
e79055d6 | 1130 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1131 | struct regulation_constraints *constraints) |
a5766f11 | 1132 | { |
272e2315 | 1133 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1134 | int ret; |
1135 | ||
1136 | /* do we need to apply the constraint voltage */ | |
1137 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1138 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1139 | int target_min, target_max; | |
d22b85a1 | 1140 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1141 | |
1142 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1143 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1144 | rdev_info(rdev, "Setting %d-%duV\n", |
1145 | rdev->constraints->min_uV, | |
1146 | rdev->constraints->max_uV); | |
1147 | _regulator_do_set_voltage(rdev, | |
1148 | rdev->constraints->min_uV, | |
1149 | rdev->constraints->max_uV); | |
d22b85a1 | 1150 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1151 | } |
1152 | ||
064d5cd1 | 1153 | if (current_uV < 0) { |
adea2831 BN |
1154 | if (current_uV != -EPROBE_DEFER) |
1155 | rdev_err(rdev, | |
1156 | "failed to get the current voltage: %pe\n", | |
1157 | ERR_PTR(current_uV)); | |
064d5cd1 AB |
1158 | return current_uV; |
1159 | } | |
fa93fd4e MB |
1160 | |
1161 | /* | |
1162 | * If we're below the minimum voltage move up to the | |
1163 | * minimum voltage, if we're above the maximum voltage | |
1164 | * then move down to the maximum. | |
1165 | */ | |
1166 | target_min = current_uV; | |
1167 | target_max = current_uV; | |
1168 | ||
1169 | if (current_uV < rdev->constraints->min_uV) { | |
1170 | target_min = rdev->constraints->min_uV; | |
1171 | target_max = rdev->constraints->min_uV; | |
1172 | } | |
1173 | ||
1174 | if (current_uV > rdev->constraints->max_uV) { | |
1175 | target_min = rdev->constraints->max_uV; | |
1176 | target_max = rdev->constraints->max_uV; | |
1177 | } | |
1178 | ||
1179 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1180 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1181 | current_uV, target_min, target_max); | |
064d5cd1 | 1182 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1183 | rdev, target_min, target_max); |
064d5cd1 AB |
1184 | if (ret < 0) { |
1185 | rdev_err(rdev, | |
61aab5ad MM |
1186 | "failed to apply %d-%duV constraint: %pe\n", |
1187 | target_min, target_max, ERR_PTR(ret)); | |
064d5cd1 AB |
1188 | return ret; |
1189 | } | |
75790251 | 1190 | } |
af5866c9 | 1191 | } |
e06f5b4f | 1192 | |
4367cfdc DB |
1193 | /* constrain machine-level voltage specs to fit |
1194 | * the actual range supported by this regulator. | |
1195 | */ | |
1196 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1197 | int count = rdev->desc->n_voltages; | |
1198 | int i; | |
1199 | int min_uV = INT_MAX; | |
1200 | int max_uV = INT_MIN; | |
1201 | int cmin = constraints->min_uV; | |
1202 | int cmax = constraints->max_uV; | |
1203 | ||
3e590918 | 1204 | /* it's safe to autoconfigure fixed-voltage supplies |
69b8821e SK |
1205 | * and the constraints are used by list_voltage. |
1206 | */ | |
4367cfdc | 1207 | if (count == 1 && !cmin) { |
3e590918 | 1208 | cmin = 1; |
4367cfdc | 1209 | cmax = INT_MAX; |
3e590918 MB |
1210 | constraints->min_uV = cmin; |
1211 | constraints->max_uV = cmax; | |
4367cfdc DB |
1212 | } |
1213 | ||
3e2b9abd MB |
1214 | /* voltage constraints are optional */ |
1215 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1216 | return 0; |
3e2b9abd | 1217 | |
4367cfdc | 1218 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1219 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1220 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1221 | return -EINVAL; |
4367cfdc DB |
1222 | } |
1223 | ||
6d30fc51 CM |
1224 | /* no need to loop voltages if range is continuous */ |
1225 | if (rdev->desc->continuous_voltage_range) | |
1226 | return 0; | |
1227 | ||
4367cfdc DB |
1228 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1229 | for (i = 0; i < count; i++) { | |
1230 | int value; | |
1231 | ||
1232 | value = ops->list_voltage(rdev, i); | |
1233 | if (value <= 0) | |
1234 | continue; | |
1235 | ||
1236 | /* maybe adjust [min_uV..max_uV] */ | |
1237 | if (value >= cmin && value < min_uV) | |
1238 | min_uV = value; | |
1239 | if (value <= cmax && value > max_uV) | |
1240 | max_uV = value; | |
1241 | } | |
1242 | ||
1243 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1244 | if (max_uV < min_uV) { | |
fff15bef MB |
1245 | rdev_err(rdev, |
1246 | "unsupportable voltage constraints %u-%uuV\n", | |
1247 | min_uV, max_uV); | |
e79055d6 | 1248 | return -EINVAL; |
4367cfdc DB |
1249 | } |
1250 | ||
1251 | /* use regulator's subset of machine constraints */ | |
1252 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1253 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1254 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1255 | constraints->min_uV = min_uV; |
1256 | } | |
1257 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1258 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1259 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1260 | constraints->max_uV = max_uV; |
1261 | } | |
1262 | } | |
1263 | ||
e79055d6 MB |
1264 | return 0; |
1265 | } | |
1266 | ||
f8c1700d LD |
1267 | static int machine_constraints_current(struct regulator_dev *rdev, |
1268 | struct regulation_constraints *constraints) | |
1269 | { | |
272e2315 | 1270 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1271 | int ret; |
1272 | ||
1273 | if (!constraints->min_uA && !constraints->max_uA) | |
1274 | return 0; | |
1275 | ||
1276 | if (constraints->min_uA > constraints->max_uA) { | |
1277 | rdev_err(rdev, "Invalid current constraints\n"); | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | ||
1281 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1282 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /* Set regulator current in constraints range */ | |
1287 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1288 | constraints->max_uA); | |
1289 | if (ret < 0) { | |
1290 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | return 0; | |
1295 | } | |
1296 | ||
30c21971 MP |
1297 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1298 | ||
89a6a5e5 MV |
1299 | static int notif_set_limit(struct regulator_dev *rdev, |
1300 | int (*set)(struct regulator_dev *, int, int, bool), | |
1301 | int limit, int severity) | |
1302 | { | |
1303 | bool enable; | |
1304 | ||
1305 | if (limit == REGULATOR_NOTIF_LIMIT_DISABLE) { | |
1306 | enable = false; | |
1307 | limit = 0; | |
1308 | } else { | |
1309 | enable = true; | |
1310 | } | |
1311 | ||
1312 | if (limit == REGULATOR_NOTIF_LIMIT_ENABLE) | |
1313 | limit = 0; | |
1314 | ||
1315 | return set(rdev, limit, severity, enable); | |
1316 | } | |
1317 | ||
1318 | static int handle_notify_limits(struct regulator_dev *rdev, | |
1319 | int (*set)(struct regulator_dev *, int, int, bool), | |
1320 | struct notification_limit *limits) | |
1321 | { | |
1322 | int ret = 0; | |
1323 | ||
1324 | if (!set) | |
1325 | return -EOPNOTSUPP; | |
1326 | ||
1327 | if (limits->prot) | |
1328 | ret = notif_set_limit(rdev, set, limits->prot, | |
1329 | REGULATOR_SEVERITY_PROT); | |
1330 | if (ret) | |
1331 | return ret; | |
1332 | ||
1333 | if (limits->err) | |
1334 | ret = notif_set_limit(rdev, set, limits->err, | |
1335 | REGULATOR_SEVERITY_ERR); | |
1336 | if (ret) | |
1337 | return ret; | |
1338 | ||
1339 | if (limits->warn) | |
1340 | ret = notif_set_limit(rdev, set, limits->warn, | |
1341 | REGULATOR_SEVERITY_WARN); | |
1342 | ||
1343 | return ret; | |
1344 | } | |
e79055d6 MB |
1345 | /** |
1346 | * set_machine_constraints - sets regulator constraints | |
1347 | * @rdev: regulator source | |
e79055d6 MB |
1348 | * |
1349 | * Allows platform initialisation code to define and constrain | |
1350 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1351 | * Constraints *must* be set by platform code in order for some | |
1352 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1353 | * set_mode. | |
1354 | */ | |
57a6ad48 | 1355 | static int set_machine_constraints(struct regulator_dev *rdev) |
e79055d6 MB |
1356 | { |
1357 | int ret = 0; | |
272e2315 | 1358 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1359 | |
f8c12fe3 | 1360 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1361 | if (ret != 0) |
6333ef46 | 1362 | return ret; |
e79055d6 | 1363 | |
f8c1700d | 1364 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1365 | if (ret != 0) |
6333ef46 | 1366 | return ret; |
e79055d6 | 1367 | |
36e4f839 SB |
1368 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1369 | ret = ops->set_input_current_limit(rdev, | |
1370 | rdev->constraints->ilim_uA); | |
1371 | if (ret < 0) { | |
61aab5ad | 1372 | rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1373 | return ret; |
36e4f839 SB |
1374 | } |
1375 | } | |
1376 | ||
a5766f11 | 1377 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1378 | if (rdev->constraints->initial_state) { |
0955f5be | 1379 | ret = suspend_set_initial_state(rdev); |
e06f5b4f | 1380 | if (ret < 0) { |
61aab5ad | 1381 | rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1382 | return ret; |
e06f5b4f MB |
1383 | } |
1384 | } | |
a5766f11 | 1385 | |
9a8f5e07 | 1386 | if (rdev->constraints->initial_mode) { |
a308466c | 1387 | if (!ops->set_mode) { |
5da84fd9 | 1388 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1389 | return -EINVAL; |
a308466c MB |
1390 | } |
1391 | ||
f8c12fe3 | 1392 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1393 | if (ret < 0) { |
61aab5ad | 1394 | rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1395 | return ret; |
a308466c | 1396 | } |
fa94e48e DA |
1397 | } else if (rdev->constraints->system_load) { |
1398 | /* | |
1399 | * We'll only apply the initial system load if an | |
1400 | * initial mode wasn't specified. | |
1401 | */ | |
1402 | drms_uA_update(rdev); | |
a308466c MB |
1403 | } |
1404 | ||
1653ccf4 YSB |
1405 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1406 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1407 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1408 | if (ret < 0) { | |
61aab5ad | 1409 | rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1410 | return ret; |
6f0b2c69 YSB |
1411 | } |
1412 | } | |
1413 | ||
23c779b9 SB |
1414 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1415 | ret = ops->set_pull_down(rdev); | |
1416 | if (ret < 0) { | |
61aab5ad | 1417 | rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1418 | return ret; |
23c779b9 SB |
1419 | } |
1420 | } | |
1421 | ||
57f66b78 SB |
1422 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1423 | ret = ops->set_soft_start(rdev); | |
1424 | if (ret < 0) { | |
61aab5ad | 1425 | rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1426 | return ret; |
57f66b78 SB |
1427 | } |
1428 | } | |
1429 | ||
89a6a5e5 MV |
1430 | /* |
1431 | * Existing logic does not warn if over_current_protection is given as | |
1432 | * a constraint but driver does not support that. I think we should | |
1433 | * warn about this type of issues as it is possible someone changes | |
1434 | * PMIC on board to another type - and the another PMIC's driver does | |
1435 | * not support setting protection. Board composer may happily believe | |
1436 | * the DT limits are respected - especially if the new PMIC HW also | |
1437 | * supports protection but the driver does not. I won't change the logic | |
1438 | * without hearing more experienced opinion on this though. | |
1439 | * | |
1440 | * If warning is seen as a good idea then we can merge handling the | |
1441 | * over-curret protection and detection and get rid of this special | |
1442 | * handling. | |
1443 | */ | |
3a003bae SB |
1444 | if (rdev->constraints->over_current_protection |
1445 | && ops->set_over_current_protection) { | |
89a6a5e5 MV |
1446 | int lim = rdev->constraints->over_curr_limits.prot; |
1447 | ||
1448 | ret = ops->set_over_current_protection(rdev, lim, | |
1449 | REGULATOR_SEVERITY_PROT, | |
1450 | true); | |
3a003bae | 1451 | if (ret < 0) { |
61aab5ad MM |
1452 | rdev_err(rdev, "failed to set over current protection: %pe\n", |
1453 | ERR_PTR(ret)); | |
6333ef46 | 1454 | return ret; |
3a003bae SB |
1455 | } |
1456 | } | |
1457 | ||
89a6a5e5 MV |
1458 | if (rdev->constraints->over_current_detection) |
1459 | ret = handle_notify_limits(rdev, | |
1460 | ops->set_over_current_protection, | |
1461 | &rdev->constraints->over_curr_limits); | |
1462 | if (ret) { | |
1463 | if (ret != -EOPNOTSUPP) { | |
1464 | rdev_err(rdev, "failed to set over current limits: %pe\n", | |
1465 | ERR_PTR(ret)); | |
1466 | return ret; | |
1467 | } | |
1468 | rdev_warn(rdev, | |
1469 | "IC does not support requested over-current limits\n"); | |
1470 | } | |
1471 | ||
1472 | if (rdev->constraints->over_voltage_detection) | |
1473 | ret = handle_notify_limits(rdev, | |
1474 | ops->set_over_voltage_protection, | |
1475 | &rdev->constraints->over_voltage_limits); | |
1476 | if (ret) { | |
1477 | if (ret != -EOPNOTSUPP) { | |
1478 | rdev_err(rdev, "failed to set over voltage limits %pe\n", | |
1479 | ERR_PTR(ret)); | |
1480 | return ret; | |
1481 | } | |
1482 | rdev_warn(rdev, | |
1483 | "IC does not support requested over voltage limits\n"); | |
1484 | } | |
1485 | ||
1486 | if (rdev->constraints->under_voltage_detection) | |
1487 | ret = handle_notify_limits(rdev, | |
1488 | ops->set_under_voltage_protection, | |
1489 | &rdev->constraints->under_voltage_limits); | |
1490 | if (ret) { | |
1491 | if (ret != -EOPNOTSUPP) { | |
1492 | rdev_err(rdev, "failed to set under voltage limits %pe\n", | |
1493 | ERR_PTR(ret)); | |
1494 | return ret; | |
1495 | } | |
1496 | rdev_warn(rdev, | |
1497 | "IC does not support requested under voltage limits\n"); | |
1498 | } | |
1499 | ||
1500 | if (rdev->constraints->over_temp_detection) | |
1501 | ret = handle_notify_limits(rdev, | |
1502 | ops->set_thermal_protection, | |
1503 | &rdev->constraints->temp_limits); | |
1504 | if (ret) { | |
1505 | if (ret != -EOPNOTSUPP) { | |
1506 | rdev_err(rdev, "failed to set temperature limits %pe\n", | |
1507 | ERR_PTR(ret)); | |
1508 | return ret; | |
1509 | } | |
1510 | rdev_warn(rdev, | |
1511 | "IC does not support requested temperature limits\n"); | |
1512 | } | |
1513 | ||
670666b9 LD |
1514 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1515 | bool ad_state = (rdev->constraints->active_discharge == | |
1516 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1517 | ||
1518 | ret = ops->set_active_discharge(rdev, ad_state); | |
1519 | if (ret < 0) { | |
61aab5ad | 1520 | rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret)); |
670666b9 LD |
1521 | return ret; |
1522 | } | |
1523 | } | |
1524 | ||
2bb16663 OS |
1525 | /* If the constraints say the regulator should be on at this point |
1526 | * and we have control then make sure it is enabled. | |
1527 | */ | |
1528 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
98e48cd9 DB |
1529 | /* If we want to enable this regulator, make sure that we know |
1530 | * the supplying regulator. | |
1531 | */ | |
1532 | if (rdev->supply_name && !rdev->supply) | |
1533 | return -EPROBE_DEFER; | |
1534 | ||
05f224ca DA |
1535 | if (rdev->supply) { |
1536 | ret = regulator_enable(rdev->supply); | |
1537 | if (ret < 0) { | |
1538 | _regulator_put(rdev->supply); | |
1539 | rdev->supply = NULL; | |
1540 | return ret; | |
1541 | } | |
1542 | } | |
1543 | ||
2bb16663 OS |
1544 | ret = _regulator_do_enable(rdev); |
1545 | if (ret < 0 && ret != -EINVAL) { | |
61aab5ad | 1546 | rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret)); |
2bb16663 OS |
1547 | return ret; |
1548 | } | |
089b3f61 PP |
1549 | |
1550 | if (rdev->constraints->always_on) | |
1551 | rdev->use_count++; | |
a5ccccb3 | 1552 | } else if (rdev->desc->off_on_delay) { |
a8ce7bd8 | 1553 | rdev->last_off = ktime_get(); |
2bb16663 OS |
1554 | } |
1555 | ||
a5766f11 | 1556 | print_constraints(rdev); |
1a6958e7 | 1557 | return 0; |
a5766f11 LG |
1558 | } |
1559 | ||
1560 | /** | |
1561 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1562 | * @rdev: regulator name |
1563 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1564 | * |
1565 | * Called by platform initialisation code to set the supply regulator for this | |
1566 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1567 | * core if it's child is enabled. | |
1568 | */ | |
1569 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1570 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1571 | { |
1572 | int err; | |
1573 | ||
3801b86a MB |
1574 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1575 | ||
e2c09ae7 JMC |
1576 | if (!try_module_get(supply_rdev->owner)) |
1577 | return -ENODEV; | |
1578 | ||
3801b86a | 1579 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1580 | if (rdev->supply == NULL) { |
1581 | err = -ENOMEM; | |
3801b86a | 1582 | return err; |
a5766f11 | 1583 | } |
57ad526a | 1584 | supply_rdev->open_count++; |
3801b86a MB |
1585 | |
1586 | return 0; | |
a5766f11 LG |
1587 | } |
1588 | ||
1589 | /** | |
06c63f93 | 1590 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1591 | * @rdev: regulator source |
40f9244f | 1592 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1593 | * @supply: symbolic name for supply |
a5766f11 LG |
1594 | * |
1595 | * Allows platform initialisation code to map physical regulator | |
1596 | * sources to symbolic names for supplies for use by devices. Devices | |
1597 | * should use these symbolic names to request regulators, avoiding the | |
1598 | * need to provide board-specific regulator names as platform data. | |
1599 | */ | |
1600 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1601 | const char *consumer_dev_name, |
1602 | const char *supply) | |
a5766f11 | 1603 | { |
5c065401 | 1604 | struct regulator_map *node, *new_node; |
9ed2099e | 1605 | int has_dev; |
a5766f11 LG |
1606 | |
1607 | if (supply == NULL) | |
1608 | return -EINVAL; | |
1609 | ||
9ed2099e MB |
1610 | if (consumer_dev_name != NULL) |
1611 | has_dev = 1; | |
1612 | else | |
1613 | has_dev = 0; | |
1614 | ||
5c065401 MM |
1615 | new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1616 | if (new_node == NULL) | |
1617 | return -ENOMEM; | |
1618 | ||
1619 | new_node->regulator = rdev; | |
1620 | new_node->supply = supply; | |
1621 | ||
1622 | if (has_dev) { | |
1623 | new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1624 | if (new_node->dev_name == NULL) { | |
1625 | kfree(new_node); | |
1626 | return -ENOMEM; | |
1627 | } | |
1628 | } | |
1629 | ||
1630 | mutex_lock(®ulator_list_mutex); | |
6001e13c | 1631 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1632 | if (node->dev_name && consumer_dev_name) { |
1633 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1634 | continue; | |
1635 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1636 | continue; |
23b5cc2a JN |
1637 | } |
1638 | ||
6001e13c DB |
1639 | if (strcmp(node->supply, supply) != 0) |
1640 | continue; | |
1641 | ||
737f360d MB |
1642 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1643 | consumer_dev_name, | |
1644 | dev_name(&node->regulator->dev), | |
1645 | node->regulator->desc->name, | |
1646 | supply, | |
1647 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
5c065401 | 1648 | goto fail; |
6001e13c DB |
1649 | } |
1650 | ||
5c065401 MM |
1651 | list_add(&new_node->list, ®ulator_map_list); |
1652 | mutex_unlock(®ulator_list_mutex); | |
40f9244f | 1653 | |
a5766f11 | 1654 | return 0; |
5c065401 MM |
1655 | |
1656 | fail: | |
1657 | mutex_unlock(®ulator_list_mutex); | |
1658 | kfree(new_node->dev_name); | |
1659 | kfree(new_node); | |
1660 | return -EBUSY; | |
a5766f11 LG |
1661 | } |
1662 | ||
0f1d747b MR |
1663 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1664 | { | |
1665 | struct regulator_map *node, *n; | |
1666 | ||
1667 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1668 | if (rdev == node->regulator) { | |
1669 | list_del(&node->list); | |
40f9244f | 1670 | kfree(node->dev_name); |
0f1d747b | 1671 | kfree(node); |
0f1d747b MR |
1672 | } |
1673 | } | |
1674 | } | |
1675 | ||
2d80a91b RF |
1676 | #ifdef CONFIG_DEBUG_FS |
1677 | static ssize_t constraint_flags_read_file(struct file *file, | |
1678 | char __user *user_buf, | |
1679 | size_t count, loff_t *ppos) | |
1680 | { | |
1681 | const struct regulator *regulator = file->private_data; | |
1682 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1683 | char *buf; | |
1684 | ssize_t ret; | |
1685 | ||
1686 | if (!c) | |
1687 | return 0; | |
1688 | ||
1689 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1690 | if (!buf) | |
1691 | return -ENOMEM; | |
1692 | ||
1693 | ret = snprintf(buf, PAGE_SIZE, | |
1694 | "always_on: %u\n" | |
1695 | "boot_on: %u\n" | |
1696 | "apply_uV: %u\n" | |
1697 | "ramp_disable: %u\n" | |
1698 | "soft_start: %u\n" | |
1699 | "pull_down: %u\n" | |
1700 | "over_current_protection: %u\n", | |
1701 | c->always_on, | |
1702 | c->boot_on, | |
1703 | c->apply_uV, | |
1704 | c->ramp_disable, | |
1705 | c->soft_start, | |
1706 | c->pull_down, | |
1707 | c->over_current_protection); | |
1708 | ||
1709 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1710 | kfree(buf); | |
1711 | ||
1712 | return ret; | |
1713 | } | |
1714 | ||
1715 | #endif | |
1716 | ||
1717 | static const struct file_operations constraint_flags_fops = { | |
1718 | #ifdef CONFIG_DEBUG_FS | |
1719 | .open = simple_open, | |
1720 | .read = constraint_flags_read_file, | |
1721 | .llseek = default_llseek, | |
1722 | #endif | |
1723 | }; | |
1724 | ||
f5726ae3 | 1725 | #define REG_STR_SIZE 64 |
414c70cb LG |
1726 | |
1727 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1728 | struct device *dev, | |
1729 | const char *supply_name) | |
1730 | { | |
1731 | struct regulator *regulator; | |
dbe954d8 | 1732 | int err = 0; |
87fe29b6 MM |
1733 | |
1734 | if (dev) { | |
1735 | char buf[REG_STR_SIZE]; | |
1736 | int size; | |
1737 | ||
1738 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", | |
1739 | dev->kobj.name, supply_name); | |
1740 | if (size >= REG_STR_SIZE) | |
1741 | return NULL; | |
1742 | ||
1743 | supply_name = kstrdup(buf, GFP_KERNEL); | |
1744 | if (supply_name == NULL) | |
1745 | return NULL; | |
1746 | } else { | |
1747 | supply_name = kstrdup_const(supply_name, GFP_KERNEL); | |
1748 | if (supply_name == NULL) | |
1749 | return NULL; | |
1750 | } | |
414c70cb LG |
1751 | |
1752 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
87fe29b6 MM |
1753 | if (regulator == NULL) { |
1754 | kfree(supply_name); | |
414c70cb | 1755 | return NULL; |
87fe29b6 | 1756 | } |
414c70cb | 1757 | |
414c70cb | 1758 | regulator->rdev = rdev; |
87fe29b6 MM |
1759 | regulator->supply_name = supply_name; |
1760 | ||
1761 | regulator_lock(rdev); | |
414c70cb | 1762 | list_add(®ulator->list, &rdev->consumer_list); |
87fe29b6 | 1763 | regulator_unlock(rdev); |
414c70cb LG |
1764 | |
1765 | if (dev) { | |
e2c98eaf SG |
1766 | regulator->dev = dev; |
1767 | ||
222cc7b1 | 1768 | /* Add a link to the device sysfs entry */ |
ff268b56 | 1769 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
87fe29b6 | 1770 | supply_name); |
414c70cb | 1771 | if (err) { |
61aab5ad MM |
1772 | rdev_dbg(rdev, "could not add device link %s: %pe\n", |
1773 | dev->kobj.name, ERR_PTR(err)); | |
222cc7b1 | 1774 | /* non-fatal */ |
414c70cb | 1775 | } |
5de70519 MB |
1776 | } |
1777 | ||
dbe954d8 HG |
1778 | if (err != -EEXIST) |
1779 | regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); | |
24751434 | 1780 | if (!regulator->debugfs) { |
ad3a942b | 1781 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1782 | } else { |
1783 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1784 | ®ulator->uA_load); | |
1785 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1786 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1787 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1788 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1789 | debugfs_create_file("constraint_flags", 0444, |
1790 | regulator->debugfs, regulator, | |
1791 | &constraint_flags_fops); | |
414c70cb | 1792 | } |
5de70519 | 1793 | |
6492bc1b MB |
1794 | /* |
1795 | * Check now if the regulator is an always on regulator - if | |
1796 | * it is then we don't need to do nearly so much work for | |
1797 | * enable/disable calls. | |
1798 | */ | |
8a34e979 | 1799 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1800 | _regulator_is_enabled(rdev)) |
1801 | regulator->always_on = true; | |
1802 | ||
414c70cb | 1803 | return regulator; |
414c70cb LG |
1804 | } |
1805 | ||
31aae2be MB |
1806 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1807 | { | |
00c877c6 LD |
1808 | if (rdev->constraints && rdev->constraints->enable_time) |
1809 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1810 | if (rdev->desc->ops->enable_time) |
1811 | return rdev->desc->ops->enable_time(rdev); | |
1812 | return rdev->desc->enable_time; | |
31aae2be MB |
1813 | } |
1814 | ||
a06ccd9c CK |
1815 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1816 | struct device *dev, const char *supply) | |
1817 | { | |
1818 | struct regulator_supply_alias *map; | |
1819 | ||
1820 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1821 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1822 | return map; | |
1823 | ||
1824 | return NULL; | |
1825 | } | |
1826 | ||
1827 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1828 | { | |
1829 | struct regulator_supply_alias *map; | |
1830 | ||
1831 | map = regulator_find_supply_alias(*dev, *supply); | |
1832 | if (map) { | |
1833 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1834 | *supply, map->alias_supply, | |
1835 | dev_name(map->alias_dev)); | |
1836 | *dev = map->alias_dev; | |
1837 | *supply = map->alias_supply; | |
1838 | } | |
1839 | } | |
1840 | ||
85f3b431 TV |
1841 | static int regulator_match(struct device *dev, const void *data) |
1842 | { | |
1843 | struct regulator_dev *r = dev_to_rdev(dev); | |
1844 | ||
1845 | return strcmp(rdev_get_name(r), data) == 0; | |
1846 | } | |
1847 | ||
1848 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1849 | { | |
1850 | struct device *dev; | |
1851 | ||
1852 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1853 | ||
1854 | return dev ? dev_to_rdev(dev) : NULL; | |
1855 | } | |
1856 | ||
1857 | /** | |
1858 | * regulator_dev_lookup - lookup a regulator device. | |
1859 | * @dev: device for regulator "consumer". | |
1860 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1861 | * |
1862 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1863 | * @supply and with the embedded struct device refcount incremented by one. |
1864 | * The refcount must be dropped by calling put_device(). | |
1865 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1866 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1867 | * in the future. | |
85f3b431 | 1868 | */ |
69511a45 | 1869 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1870 | const char *supply) |
69511a45 | 1871 | { |
06217197 | 1872 | struct regulator_dev *r = NULL; |
69511a45 | 1873 | struct device_node *node; |
576ca436 MB |
1874 | struct regulator_map *map; |
1875 | const char *devname = NULL; | |
69511a45 | 1876 | |
a06ccd9c CK |
1877 | regulator_supply_alias(&dev, &supply); |
1878 | ||
69511a45 RN |
1879 | /* first do a dt based lookup */ |
1880 | if (dev && dev->of_node) { | |
1881 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1882 | if (node) { |
85f3b431 TV |
1883 | r = of_find_regulator_by_node(node); |
1884 | if (r) | |
1885 | return r; | |
163478da | 1886 | |
6d191a5f | 1887 | /* |
163478da DT |
1888 | * We have a node, but there is no device. |
1889 | * assume it has not registered yet. | |
6d191a5f | 1890 | */ |
163478da | 1891 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1892 | } |
69511a45 RN |
1893 | } |
1894 | ||
1895 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1896 | if (dev) |
1897 | devname = dev_name(dev); | |
1898 | ||
85f3b431 | 1899 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1900 | list_for_each_entry(map, ®ulator_map_list, list) { |
1901 | /* If the mapping has a device set up it must match */ | |
1902 | if (map->dev_name && | |
1903 | (!devname || strcmp(map->dev_name, devname))) | |
1904 | continue; | |
1905 | ||
85f3b431 TV |
1906 | if (strcmp(map->supply, supply) == 0 && |
1907 | get_device(&map->regulator->dev)) { | |
163478da DT |
1908 | r = map->regulator; |
1909 | break; | |
85f3b431 | 1910 | } |
576ca436 | 1911 | } |
85f3b431 | 1912 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1913 | |
06217197 CK |
1914 | if (r) |
1915 | return r; | |
1916 | ||
1917 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1918 | if (r) |
1919 | return r; | |
1920 | ||
1921 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1922 | } |
1923 | ||
6261b06d BA |
1924 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1925 | { | |
1926 | struct regulator_dev *r; | |
1927 | struct device *dev = rdev->dev.parent; | |
eaa7995c | 1928 | int ret = 0; |
6261b06d | 1929 | |
48f1b4ef | 1930 | /* No supply to resolve? */ |
6261b06d BA |
1931 | if (!rdev->supply_name) |
1932 | return 0; | |
1933 | ||
eaa7995c | 1934 | /* Supply already resolved? (fast-path without locking contention) */ |
6261b06d BA |
1935 | if (rdev->supply) |
1936 | return 0; | |
1937 | ||
163478da DT |
1938 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1939 | if (IS_ERR(r)) { | |
1940 | ret = PTR_ERR(r); | |
1941 | ||
06423121 MB |
1942 | /* Did the lookup explicitly defer for us? */ |
1943 | if (ret == -EPROBE_DEFER) | |
eaa7995c | 1944 | goto out; |
06423121 | 1945 | |
9f7e25ed MB |
1946 | if (have_full_constraints()) { |
1947 | r = dummy_regulator_rdev; | |
85f3b431 | 1948 | get_device(&r->dev); |
9f7e25ed MB |
1949 | } else { |
1950 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1951 | rdev->supply_name, rdev->desc->name); | |
eaa7995c DC |
1952 | ret = -EPROBE_DEFER; |
1953 | goto out; | |
9f7e25ed | 1954 | } |
6261b06d BA |
1955 | } |
1956 | ||
4b639e25 MM |
1957 | if (r == rdev) { |
1958 | dev_err(dev, "Supply for %s (%s) resolved to itself\n", | |
1959 | rdev->desc->name, rdev->supply_name); | |
eaa7995c DC |
1960 | if (!have_full_constraints()) { |
1961 | ret = -EINVAL; | |
1962 | goto out; | |
1963 | } | |
f5c042b2 MM |
1964 | r = dummy_regulator_rdev; |
1965 | get_device(&r->dev); | |
4b639e25 MM |
1966 | } |
1967 | ||
66d228a2 JH |
1968 | /* |
1969 | * If the supply's parent device is not the same as the | |
1970 | * regulator's parent device, then ensure the parent device | |
1971 | * is bound before we resolve the supply, in case the parent | |
1972 | * device get probe deferred and unregisters the supply. | |
1973 | */ | |
1974 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1975 | if (!device_is_bound(r->dev.parent)) { | |
1976 | put_device(&r->dev); | |
eaa7995c DC |
1977 | ret = -EPROBE_DEFER; |
1978 | goto out; | |
66d228a2 JH |
1979 | } |
1980 | } | |
1981 | ||
6261b06d BA |
1982 | /* Recursively resolve the supply of the supply */ |
1983 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1984 | if (ret < 0) { |
1985 | put_device(&r->dev); | |
eaa7995c | 1986 | goto out; |
85f3b431 | 1987 | } |
6261b06d | 1988 | |
14a71d50 MB |
1989 | /* |
1990 | * Recheck rdev->supply with rdev->mutex lock held to avoid a race | |
1991 | * between rdev->supply null check and setting rdev->supply in | |
1992 | * set_supply() from concurrent tasks. | |
1993 | */ | |
1994 | regulator_lock(rdev); | |
1995 | ||
1996 | /* Supply just resolved by a concurrent task? */ | |
1997 | if (rdev->supply) { | |
1998 | regulator_unlock(rdev); | |
1999 | put_device(&r->dev); | |
2000 | goto out; | |
2001 | } | |
2002 | ||
6261b06d | 2003 | ret = set_supply(rdev, r); |
85f3b431 | 2004 | if (ret < 0) { |
14a71d50 | 2005 | regulator_unlock(rdev); |
85f3b431 | 2006 | put_device(&r->dev); |
eaa7995c | 2007 | goto out; |
85f3b431 | 2008 | } |
6261b06d | 2009 | |
14a71d50 MB |
2010 | regulator_unlock(rdev); |
2011 | ||
05f224ca DA |
2012 | /* |
2013 | * In set_machine_constraints() we may have turned this regulator on | |
2014 | * but we couldn't propagate to the supply if it hadn't been resolved | |
2015 | * yet. Do it now. | |
2016 | */ | |
2017 | if (rdev->use_count) { | |
6261b06d | 2018 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 2019 | if (ret < 0) { |
9f8df6ad | 2020 | _regulator_put(rdev->supply); |
8e5356a7 | 2021 | rdev->supply = NULL; |
eaa7995c | 2022 | goto out; |
36a1f1b6 | 2023 | } |
6261b06d BA |
2024 | } |
2025 | ||
eaa7995c | 2026 | out: |
eaa7995c | 2027 | return ret; |
6261b06d BA |
2028 | } |
2029 | ||
5ffbd136 | 2030 | /* Internal regulator request function */ |
a8bd42a9 DT |
2031 | struct regulator *_regulator_get(struct device *dev, const char *id, |
2032 | enum regulator_get_type get_type) | |
414c70cb LG |
2033 | { |
2034 | struct regulator_dev *rdev; | |
7d245afa | 2035 | struct regulator *regulator; |
b59b6544 | 2036 | struct device_link *link; |
317b5684 | 2037 | int ret; |
414c70cb | 2038 | |
a8bd42a9 DT |
2039 | if (get_type >= MAX_GET_TYPE) { |
2040 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
2041 | return ERR_PTR(-EINVAL); | |
2042 | } | |
2043 | ||
414c70cb | 2044 | if (id == NULL) { |
5da84fd9 | 2045 | pr_err("get() with no identifier\n"); |
043c998f | 2046 | return ERR_PTR(-EINVAL); |
414c70cb LG |
2047 | } |
2048 | ||
163478da | 2049 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
2050 | if (IS_ERR(rdev)) { |
2051 | ret = PTR_ERR(rdev); | |
1e4b545c | 2052 | |
a4d7641f DT |
2053 | /* |
2054 | * If regulator_dev_lookup() fails with error other | |
2055 | * than -ENODEV our job here is done, we simply return it. | |
2056 | */ | |
2057 | if (ret != -ENODEV) | |
2058 | return ERR_PTR(ret); | |
34abbd68 | 2059 | |
a4d7641f DT |
2060 | if (!have_full_constraints()) { |
2061 | dev_warn(dev, | |
2062 | "incomplete constraints, dummy supplies not allowed\n"); | |
2063 | return ERR_PTR(-ENODEV); | |
2064 | } | |
4ddfebd3 | 2065 | |
a4d7641f DT |
2066 | switch (get_type) { |
2067 | case NORMAL_GET: | |
2068 | /* | |
2069 | * Assume that a regulator is physically present and | |
2070 | * enabled, even if it isn't hooked up, and just | |
2071 | * provide a dummy. | |
2072 | */ | |
6e5505cf | 2073 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
2074 | rdev = dummy_regulator_rdev; |
2075 | get_device(&rdev->dev); | |
2076 | break; | |
34abbd68 | 2077 | |
a4d7641f DT |
2078 | case EXCLUSIVE_GET: |
2079 | dev_warn(dev, | |
2080 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 2081 | fallthrough; |
34abbd68 | 2082 | |
a4d7641f DT |
2083 | default: |
2084 | return ERR_PTR(-ENODEV); | |
2085 | } | |
34abbd68 | 2086 | } |
34abbd68 | 2087 | |
5ffbd136 MB |
2088 | if (rdev->exclusive) { |
2089 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
2090 | put_device(&rdev->dev); |
2091 | return regulator; | |
5ffbd136 MB |
2092 | } |
2093 | ||
a8bd42a9 | 2094 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 2095 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
2096 | put_device(&rdev->dev); |
2097 | return regulator; | |
5ffbd136 MB |
2098 | } |
2099 | ||
79d6f049 DO |
2100 | mutex_lock(®ulator_list_mutex); |
2101 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
2102 | mutex_unlock(®ulator_list_mutex); | |
2103 | ||
2104 | if (ret != 0) { | |
2105 | regulator = ERR_PTR(-EPROBE_DEFER); | |
2106 | put_device(&rdev->dev); | |
2107 | return regulator; | |
2108 | } | |
2109 | ||
6261b06d BA |
2110 | ret = regulator_resolve_supply(rdev); |
2111 | if (ret < 0) { | |
2112 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
2113 | put_device(&rdev->dev); |
2114 | return regulator; | |
6261b06d BA |
2115 | } |
2116 | ||
85f3b431 | 2117 | if (!try_module_get(rdev->owner)) { |
7d245afa | 2118 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
2119 | put_device(&rdev->dev); |
2120 | return regulator; | |
2121 | } | |
a5766f11 | 2122 | |
414c70cb LG |
2123 | regulator = create_regulator(rdev, dev, id); |
2124 | if (regulator == NULL) { | |
2125 | regulator = ERR_PTR(-ENOMEM); | |
2126 | module_put(rdev->owner); | |
4affd79a | 2127 | put_device(&rdev->dev); |
85f3b431 | 2128 | return regulator; |
414c70cb LG |
2129 | } |
2130 | ||
5ffbd136 | 2131 | rdev->open_count++; |
a8bd42a9 | 2132 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
2133 | rdev->exclusive = 1; |
2134 | ||
2135 | ret = _regulator_is_enabled(rdev); | |
2136 | if (ret > 0) | |
2137 | rdev->use_count = 1; | |
2138 | else | |
2139 | rdev->use_count = 0; | |
2140 | } | |
2141 | ||
b59b6544 SK |
2142 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
2143 | if (!IS_ERR_OR_NULL(link)) | |
2144 | regulator->device_link = true; | |
ed1ae2dd | 2145 | |
414c70cb LG |
2146 | return regulator; |
2147 | } | |
5ffbd136 MB |
2148 | |
2149 | /** | |
2150 | * regulator_get - lookup and obtain a reference to a regulator. | |
2151 | * @dev: device for regulator "consumer" | |
2152 | * @id: Supply name or regulator ID. | |
2153 | * | |
2154 | * Returns a struct regulator corresponding to the regulator producer, | |
2155 | * or IS_ERR() condition containing errno. | |
2156 | * | |
90cf443d | 2157 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2158 | * strongly encouraged. It is recommended that the supply name used |
2159 | * should match the name used for the supply and/or the relevant | |
2160 | * device pins in the datasheet. | |
2161 | */ | |
2162 | struct regulator *regulator_get(struct device *dev, const char *id) | |
2163 | { | |
a8bd42a9 | 2164 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 2165 | } |
414c70cb LG |
2166 | EXPORT_SYMBOL_GPL(regulator_get); |
2167 | ||
5ffbd136 MB |
2168 | /** |
2169 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
2170 | * @dev: device for regulator "consumer" | |
2171 | * @id: Supply name or regulator ID. | |
2172 | * | |
2173 | * Returns a struct regulator corresponding to the regulator producer, | |
2174 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
2175 | * unable to obtain this regulator while this reference is held and the |
2176 | * use count for the regulator will be initialised to reflect the current | |
2177 | * state of the regulator. | |
5ffbd136 MB |
2178 | * |
2179 | * This is intended for use by consumers which cannot tolerate shared | |
2180 | * use of the regulator such as those which need to force the | |
2181 | * regulator off for correct operation of the hardware they are | |
2182 | * controlling. | |
2183 | * | |
90cf443d | 2184 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2185 | * strongly encouraged. It is recommended that the supply name used |
2186 | * should match the name used for the supply and/or the relevant | |
2187 | * device pins in the datasheet. | |
2188 | */ | |
2189 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2190 | { | |
a8bd42a9 | 2191 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2192 | } |
2193 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2194 | ||
de1dd9fd MB |
2195 | /** |
2196 | * regulator_get_optional - obtain optional access to a regulator. | |
2197 | * @dev: device for regulator "consumer" | |
2198 | * @id: Supply name or regulator ID. | |
2199 | * | |
2200 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2201 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2202 | * |
2203 | * This is intended for use by consumers for devices which can have | |
2204 | * some supplies unconnected in normal use, such as some MMC devices. | |
2205 | * It can allow the regulator core to provide stub supplies for other | |
2206 | * supplies requested using normal regulator_get() calls without | |
2207 | * disrupting the operation of drivers that can handle absent | |
2208 | * supplies. | |
2209 | * | |
90cf443d | 2210 | * Use of supply names configured via set_consumer_device_supply() is |
de1dd9fd MB |
2211 | * strongly encouraged. It is recommended that the supply name used |
2212 | * should match the name used for the supply and/or the relevant | |
2213 | * device pins in the datasheet. | |
2214 | */ | |
2215 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2216 | { | |
a8bd42a9 | 2217 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2218 | } |
2219 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2220 | ||
e1794aa4 | 2221 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2222 | { |
e1794aa4 | 2223 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2224 | |
5de70519 | 2225 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2226 | |
ed1ae2dd | 2227 | if (regulator->dev) { |
b59b6544 SK |
2228 | if (regulator->device_link) |
2229 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2230 | |
2231 | /* remove any sysfs entries */ | |
414c70cb | 2232 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2233 | } |
2234 | ||
66cf9a7e | 2235 | regulator_lock(rdev); |
414c70cb | 2236 | list_del(®ulator->list); |
414c70cb | 2237 | |
5ffbd136 MB |
2238 | rdev->open_count--; |
2239 | rdev->exclusive = 0; | |
66cf9a7e | 2240 | regulator_unlock(rdev); |
5ffbd136 | 2241 | |
0630b614 | 2242 | kfree_const(regulator->supply_name); |
1768514e | 2243 | kfree(regulator); |
e1794aa4 SK |
2244 | } |
2245 | ||
2246 | /* regulator_list_mutex lock held by regulator_put() */ | |
2247 | static void _regulator_put(struct regulator *regulator) | |
2248 | { | |
2249 | struct regulator_dev *rdev; | |
2250 | ||
2251 | if (IS_ERR_OR_NULL(regulator)) | |
2252 | return; | |
2253 | ||
2254 | lockdep_assert_held_once(®ulator_list_mutex); | |
2255 | ||
2256 | /* Docs say you must disable before calling regulator_put() */ | |
2257 | WARN_ON(regulator->enable_count); | |
2258 | ||
2259 | rdev = regulator->rdev; | |
2260 | ||
2261 | destroy_regulator(regulator); | |
1768514e | 2262 | |
414c70cb | 2263 | module_put(rdev->owner); |
4affd79a | 2264 | put_device(&rdev->dev); |
23ff2f0f CK |
2265 | } |
2266 | ||
2267 | /** | |
2268 | * regulator_put - "free" the regulator source | |
2269 | * @regulator: regulator source | |
2270 | * | |
2271 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2272 | * regulator source are balanced by regulator_disable calls prior to calling | |
2273 | * this function. | |
2274 | */ | |
2275 | void regulator_put(struct regulator *regulator) | |
2276 | { | |
2277 | mutex_lock(®ulator_list_mutex); | |
2278 | _regulator_put(regulator); | |
414c70cb LG |
2279 | mutex_unlock(®ulator_list_mutex); |
2280 | } | |
2281 | EXPORT_SYMBOL_GPL(regulator_put); | |
2282 | ||
a06ccd9c CK |
2283 | /** |
2284 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2285 | * | |
2286 | * @dev: device that will be given as the regulator "consumer" | |
2287 | * @id: Supply name or regulator ID | |
2288 | * @alias_dev: device that should be used to lookup the supply | |
2289 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2290 | * supply | |
2291 | * | |
2292 | * All lookups for id on dev will instead be conducted for alias_id on | |
2293 | * alias_dev. | |
2294 | */ | |
2295 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2296 | struct device *alias_dev, | |
2297 | const char *alias_id) | |
2298 | { | |
2299 | struct regulator_supply_alias *map; | |
2300 | ||
2301 | map = regulator_find_supply_alias(dev, id); | |
2302 | if (map) | |
2303 | return -EEXIST; | |
2304 | ||
2305 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2306 | if (!map) | |
2307 | return -ENOMEM; | |
2308 | ||
2309 | map->src_dev = dev; | |
2310 | map->src_supply = id; | |
2311 | map->alias_dev = alias_dev; | |
2312 | map->alias_supply = alias_id; | |
2313 | ||
2314 | list_add(&map->list, ®ulator_supply_alias_list); | |
2315 | ||
2316 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2317 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2322 | ||
2323 | /** | |
2324 | * regulator_unregister_supply_alias - Remove device alias | |
2325 | * | |
2326 | * @dev: device that will be given as the regulator "consumer" | |
2327 | * @id: Supply name or regulator ID | |
2328 | * | |
2329 | * Remove a lookup alias if one exists for id on dev. | |
2330 | */ | |
2331 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2332 | { | |
2333 | struct regulator_supply_alias *map; | |
2334 | ||
2335 | map = regulator_find_supply_alias(dev, id); | |
2336 | if (map) { | |
2337 | list_del(&map->list); | |
2338 | kfree(map); | |
2339 | } | |
2340 | } | |
2341 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2342 | ||
2343 | /** | |
2344 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2345 | * | |
2346 | * @dev: device that will be given as the regulator "consumer" | |
2347 | * @id: List of supply names or regulator IDs | |
2348 | * @alias_dev: device that should be used to lookup the supply | |
2349 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2350 | * lookup the supply | |
2351 | * @num_id: Number of aliases to register | |
2352 | * | |
2353 | * @return 0 on success, an errno on failure. | |
2354 | * | |
2355 | * This helper function allows drivers to register several supply | |
2356 | * aliases in one operation. If any of the aliases cannot be | |
2357 | * registered any aliases that were registered will be removed | |
2358 | * before returning to the caller. | |
2359 | */ | |
9f8c0fe9 LJ |
2360 | int regulator_bulk_register_supply_alias(struct device *dev, |
2361 | const char *const *id, | |
a06ccd9c | 2362 | struct device *alias_dev, |
9f8c0fe9 | 2363 | const char *const *alias_id, |
a06ccd9c CK |
2364 | int num_id) |
2365 | { | |
2366 | int i; | |
2367 | int ret; | |
2368 | ||
2369 | for (i = 0; i < num_id; ++i) { | |
2370 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2371 | alias_id[i]); | |
2372 | if (ret < 0) | |
2373 | goto err; | |
2374 | } | |
2375 | ||
2376 | return 0; | |
2377 | ||
2378 | err: | |
2379 | dev_err(dev, | |
2380 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2381 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2382 | ||
2383 | while (--i >= 0) | |
2384 | regulator_unregister_supply_alias(dev, id[i]); | |
2385 | ||
2386 | return ret; | |
2387 | } | |
2388 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2389 | ||
2390 | /** | |
2391 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2392 | * | |
2393 | * @dev: device that will be given as the regulator "consumer" | |
2394 | * @id: List of supply names or regulator IDs | |
2395 | * @num_id: Number of aliases to unregister | |
2396 | * | |
2397 | * This helper function allows drivers to unregister several supply | |
2398 | * aliases in one operation. | |
2399 | */ | |
2400 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2401 | const char *const *id, |
a06ccd9c CK |
2402 | int num_id) |
2403 | { | |
2404 | int i; | |
2405 | ||
2406 | for (i = 0; i < num_id; ++i) | |
2407 | regulator_unregister_supply_alias(dev, id[i]); | |
2408 | } | |
2409 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2410 | ||
2411 | ||
f19b00da KM |
2412 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2413 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2414 | const struct regulator_config *config) | |
2415 | { | |
467bf301 | 2416 | struct regulator_enable_gpio *pin, *new_pin; |
778b28b4 | 2417 | struct gpio_desc *gpiod; |
f19b00da | 2418 | |
541d052d | 2419 | gpiod = config->ena_gpiod; |
467bf301 MM |
2420 | new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL); |
2421 | ||
2422 | mutex_lock(®ulator_list_mutex); | |
778b28b4 | 2423 | |
f19b00da | 2424 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2425 | if (pin->gpiod == gpiod) { |
541d052d | 2426 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2427 | goto update_ena_gpio_to_rdev; |
2428 | } | |
2429 | } | |
2430 | ||
467bf301 MM |
2431 | if (new_pin == NULL) { |
2432 | mutex_unlock(®ulator_list_mutex); | |
f19b00da | 2433 | return -ENOMEM; |
467bf301 MM |
2434 | } |
2435 | ||
2436 | pin = new_pin; | |
2437 | new_pin = NULL; | |
f19b00da | 2438 | |
778b28b4 | 2439 | pin->gpiod = gpiod; |
f19b00da KM |
2440 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2441 | ||
2442 | update_ena_gpio_to_rdev: | |
2443 | pin->request_count++; | |
2444 | rdev->ena_pin = pin; | |
467bf301 MM |
2445 | |
2446 | mutex_unlock(®ulator_list_mutex); | |
2447 | kfree(new_pin); | |
2448 | ||
f19b00da KM |
2449 | return 0; |
2450 | } | |
2451 | ||
2452 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2453 | { | |
2454 | struct regulator_enable_gpio *pin, *n; | |
2455 | ||
2456 | if (!rdev->ena_pin) | |
2457 | return; | |
2458 | ||
2459 | /* Free the GPIO only in case of no use */ | |
2460 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
2dbf0855 MM |
2461 | if (pin != rdev->ena_pin) |
2462 | continue; | |
2463 | ||
2464 | if (--pin->request_count) | |
2465 | break; | |
2466 | ||
2467 | gpiod_put(pin->gpiod); | |
2468 | list_del(&pin->list); | |
2469 | kfree(pin); | |
2470 | break; | |
f19b00da | 2471 | } |
2dbf0855 MM |
2472 | |
2473 | rdev->ena_pin = NULL; | |
f19b00da KM |
2474 | } |
2475 | ||
967cfb18 | 2476 | /** |
31d6eebf RD |
2477 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2478 | * @rdev: regulator_dev structure | |
2479 | * @enable: enable GPIO at initial use? | |
2480 | * | |
967cfb18 KM |
2481 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2482 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2483 | */ | |
2484 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2485 | { | |
2486 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2487 | ||
2488 | if (!pin) | |
2489 | return -EINVAL; | |
2490 | ||
2491 | if (enable) { | |
2492 | /* Enable GPIO at initial use */ | |
2493 | if (pin->enable_count == 0) | |
01dc79cd | 2494 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2495 | |
2496 | pin->enable_count++; | |
2497 | } else { | |
2498 | if (pin->enable_count > 1) { | |
2499 | pin->enable_count--; | |
2500 | return 0; | |
2501 | } | |
2502 | ||
2503 | /* Disable GPIO if not used */ | |
2504 | if (pin->enable_count <= 1) { | |
01dc79cd | 2505 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2506 | pin->enable_count = 0; |
2507 | } | |
2508 | } | |
2509 | ||
2510 | return 0; | |
2511 | } | |
2512 | ||
79fd1141 GX |
2513 | /** |
2514 | * _regulator_enable_delay - a delay helper function | |
2515 | * @delay: time to delay in microseconds | |
2516 | * | |
2517 | * Delay for the requested amount of time as per the guidelines in: | |
2518 | * | |
458f69ef | 2519 | * Documentation/timers/timers-howto.rst |
79fd1141 GX |
2520 | * |
2521 | * The assumption here is that regulators will never be enabled in | |
2522 | * atomic context and therefore sleeping functions can be used. | |
2523 | */ | |
2524 | static void _regulator_enable_delay(unsigned int delay) | |
2525 | { | |
2526 | unsigned int ms = delay / 1000; | |
2527 | unsigned int us = delay % 1000; | |
2528 | ||
2529 | if (ms > 0) { | |
2530 | /* | |
2531 | * For small enough values, handle super-millisecond | |
2532 | * delays in the usleep_range() call below. | |
2533 | */ | |
2534 | if (ms < 20) | |
2535 | us += ms * 1000; | |
2536 | else | |
2537 | msleep(ms); | |
2538 | } | |
2539 | ||
2540 | /* | |
2541 | * Give the scheduler some room to coalesce with any other | |
2542 | * wakeup sources. For delays shorter than 10 us, don't even | |
2543 | * bother setting up high-resolution timers and just busy- | |
2544 | * loop. | |
2545 | */ | |
2546 | if (us >= 10) | |
2547 | usleep_range(us, us + 100); | |
2548 | else | |
2549 | udelay(us); | |
2550 | } | |
2551 | ||
f7d7ad42 SS |
2552 | /** |
2553 | * _regulator_check_status_enabled | |
2554 | * | |
2555 | * A helper function to check if the regulator status can be interpreted | |
2556 | * as 'regulator is enabled'. | |
2557 | * @rdev: the regulator device to check | |
2558 | * | |
2559 | * Return: | |
2560 | * * 1 - if status shows regulator is in enabled state | |
2561 | * * 0 - if not enabled state | |
2562 | * * Error Value - as received from ops->get_status() | |
2563 | */ | |
2564 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2565 | { | |
2566 | int ret = rdev->desc->ops->get_status(rdev); | |
2567 | ||
2568 | if (ret < 0) { | |
2569 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2570 | return ret; | |
2571 | } | |
2572 | ||
2573 | switch (ret) { | |
2574 | case REGULATOR_STATUS_OFF: | |
2575 | case REGULATOR_STATUS_ERROR: | |
2576 | case REGULATOR_STATUS_UNDEFINED: | |
2577 | return 0; | |
2578 | default: | |
2579 | return 1; | |
2580 | } | |
2581 | } | |
2582 | ||
5c5659d0 MB |
2583 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2584 | { | |
2585 | int ret, delay; | |
2586 | ||
2587 | /* Query before enabling in case configuration dependent. */ | |
2588 | ret = _regulator_get_enable_time(rdev); | |
2589 | if (ret >= 0) { | |
2590 | delay = ret; | |
2591 | } else { | |
61aab5ad | 2592 | rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret)); |
5c5659d0 MB |
2593 | delay = 0; |
2594 | } | |
2595 | ||
2596 | trace_regulator_enable(rdev_get_name(rdev)); | |
2597 | ||
a8ce7bd8 | 2598 | if (rdev->desc->off_on_delay && rdev->last_off) { |
871f5650 GX |
2599 | /* if needed, keep a distance of off_on_delay from last time |
2600 | * this regulator was disabled. | |
2601 | */ | |
a8ce7bd8 VW |
2602 | ktime_t end = ktime_add_us(rdev->last_off, rdev->desc->off_on_delay); |
2603 | s64 remaining = ktime_us_delta(end, ktime_get()); | |
2604 | ||
2605 | if (remaining > 0) | |
2606 | _regulator_enable_delay(remaining); | |
871f5650 GX |
2607 | } |
2608 | ||
967cfb18 | 2609 | if (rdev->ena_pin) { |
29d62ec5 DA |
2610 | if (!rdev->ena_gpio_state) { |
2611 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2612 | if (ret < 0) | |
2613 | return ret; | |
2614 | rdev->ena_gpio_state = 1; | |
2615 | } | |
65f73508 | 2616 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2617 | ret = rdev->desc->ops->enable(rdev); |
2618 | if (ret < 0) | |
2619 | return ret; | |
2620 | } else { | |
2621 | return -EINVAL; | |
2622 | } | |
2623 | ||
2624 | /* Allow the regulator to ramp; it would be useful to extend | |
2625 | * this for bulk operations so that the regulators can ramp | |
69b8821e SK |
2626 | * together. |
2627 | */ | |
5c5659d0 MB |
2628 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
2629 | ||
f7d7ad42 SS |
2630 | /* If poll_enabled_time is set, poll upto the delay calculated |
2631 | * above, delaying poll_enabled_time uS to check if the regulator | |
2632 | * actually got enabled. | |
2633 | * If the regulator isn't enabled after enable_delay has | |
2634 | * expired, return -ETIMEDOUT. | |
2635 | */ | |
2636 | if (rdev->desc->poll_enabled_time) { | |
2637 | unsigned int time_remaining = delay; | |
2638 | ||
2639 | while (time_remaining > 0) { | |
2640 | _regulator_enable_delay(rdev->desc->poll_enabled_time); | |
2641 | ||
2642 | if (rdev->desc->ops->get_status) { | |
2643 | ret = _regulator_check_status_enabled(rdev); | |
2644 | if (ret < 0) | |
2645 | return ret; | |
2646 | else if (ret) | |
2647 | break; | |
2648 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2649 | break; | |
2650 | ||
2651 | time_remaining -= rdev->desc->poll_enabled_time; | |
2652 | } | |
2653 | ||
2654 | if (time_remaining <= 0) { | |
2655 | rdev_err(rdev, "Enabled check timed out\n"); | |
2656 | return -ETIMEDOUT; | |
2657 | } | |
2658 | } else { | |
2659 | _regulator_enable_delay(delay); | |
2660 | } | |
5c5659d0 MB |
2661 | |
2662 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2663 | ||
2664 | return 0; | |
2665 | } | |
2666 | ||
5451781d DA |
2667 | /** |
2668 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2669 | * @regulator: regulator source | |
2670 | * | |
2671 | * Some things on a regulator consumer (like the contribution towards total | |
2672 | * load on the regulator) only have an effect when the consumer wants the | |
2673 | * regulator enabled. Explained in example with two consumers of the same | |
2674 | * regulator: | |
2675 | * consumer A: set_load(100); => total load = 0 | |
2676 | * consumer A: regulator_enable(); => total load = 100 | |
2677 | * consumer B: set_load(1000); => total load = 100 | |
2678 | * consumer B: regulator_enable(); => total load = 1100 | |
2679 | * consumer A: regulator_disable(); => total_load = 1000 | |
2680 | * | |
2681 | * This function (together with _regulator_handle_consumer_disable) is | |
2682 | * responsible for keeping track of the refcount for a given regulator consumer | |
2683 | * and applying / unapplying these things. | |
2684 | * | |
2685 | * Returns 0 upon no error; -error upon error. | |
2686 | */ | |
2687 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2688 | { | |
2689 | struct regulator_dev *rdev = regulator->rdev; | |
2690 | ||
2691 | lockdep_assert_held_once(&rdev->mutex.base); | |
2692 | ||
2693 | regulator->enable_count++; | |
2694 | if (regulator->uA_load && regulator->enable_count == 1) | |
2695 | return drms_uA_update(rdev); | |
2696 | ||
2697 | return 0; | |
2698 | } | |
2699 | ||
2700 | /** | |
2701 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2702 | * @regulator: regulator source | |
2703 | * | |
2704 | * The opposite of _regulator_handle_consumer_enable(). | |
2705 | * | |
2706 | * Returns 0 upon no error; -error upon error. | |
2707 | */ | |
2708 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2709 | { | |
2710 | struct regulator_dev *rdev = regulator->rdev; | |
2711 | ||
2712 | lockdep_assert_held_once(&rdev->mutex.base); | |
2713 | ||
2714 | if (!regulator->enable_count) { | |
2715 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2716 | return -EINVAL; | |
2717 | } | |
2718 | ||
2719 | regulator->enable_count--; | |
2720 | if (regulator->uA_load && regulator->enable_count == 0) | |
2721 | return drms_uA_update(rdev); | |
2722 | ||
2723 | return 0; | |
2724 | } | |
2725 | ||
414c70cb | 2726 | /* locks held by regulator_enable() */ |
5451781d | 2727 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2728 | { |
5451781d | 2729 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2730 | int ret; |
414c70cb | 2731 | |
f8702f9e DO |
2732 | lockdep_assert_held_once(&rdev->mutex.base); |
2733 | ||
1fc12b05 | 2734 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2735 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2736 | if (ret < 0) |
2737 | return ret; | |
2738 | } | |
2739 | ||
2740 | /* balance only if there are regulators coupled */ | |
2741 | if (rdev->coupling_desc.n_coupled > 1) { | |
2742 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2743 | if (ret < 0) | |
2744 | goto err_disable_supply; | |
2745 | } | |
70cfef26 | 2746 | |
5451781d DA |
2747 | ret = _regulator_handle_consumer_enable(regulator); |
2748 | if (ret < 0) | |
2749 | goto err_disable_supply; | |
414c70cb | 2750 | |
9a2372fa | 2751 | if (rdev->use_count == 0) { |
72241e31 SF |
2752 | /* |
2753 | * The regulator may already be enabled if it's not switchable | |
2754 | * or was left on | |
2755 | */ | |
9a2372fa MB |
2756 | ret = _regulator_is_enabled(rdev); |
2757 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2758 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2759 | REGULATOR_CHANGE_STATUS)) { |
2760 | ret = -EPERM; | |
5451781d | 2761 | goto err_consumer_disable; |
f8702f9e | 2762 | } |
9a2372fa | 2763 | |
5c5659d0 | 2764 | ret = _regulator_do_enable(rdev); |
31aae2be | 2765 | if (ret < 0) |
5451781d | 2766 | goto err_consumer_disable; |
31aae2be | 2767 | |
264b88c9 HG |
2768 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2769 | NULL); | |
a7433cff | 2770 | } else if (ret < 0) { |
61aab5ad | 2771 | rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret)); |
5451781d | 2772 | goto err_consumer_disable; |
414c70cb | 2773 | } |
a7433cff | 2774 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2775 | } |
2776 | ||
9a2372fa MB |
2777 | rdev->use_count++; |
2778 | ||
2779 | return 0; | |
f8702f9e | 2780 | |
5451781d DA |
2781 | err_consumer_disable: |
2782 | _regulator_handle_consumer_disable(regulator); | |
2783 | ||
f8702f9e | 2784 | err_disable_supply: |
1fc12b05 | 2785 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2786 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2787 | |
2788 | return ret; | |
414c70cb LG |
2789 | } |
2790 | ||
2791 | /** | |
2792 | * regulator_enable - enable regulator output | |
2793 | * @regulator: regulator source | |
2794 | * | |
cf7bbcdf MB |
2795 | * Request that the regulator be enabled with the regulator output at |
2796 | * the predefined voltage or current value. Calls to regulator_enable() | |
2797 | * must be balanced with calls to regulator_disable(). | |
2798 | * | |
414c70cb | 2799 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2800 | * hardwired in the regulator. |
414c70cb LG |
2801 | */ |
2802 | int regulator_enable(struct regulator *regulator) | |
2803 | { | |
412aec61 | 2804 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2805 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2806 | int ret; |
6492bc1b | 2807 | |
f8702f9e | 2808 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2809 | ret = _regulator_enable(regulator); |
f8702f9e | 2810 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2811 | |
414c70cb LG |
2812 | return ret; |
2813 | } | |
2814 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2815 | ||
5c5659d0 MB |
2816 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2817 | { | |
2818 | int ret; | |
2819 | ||
2820 | trace_regulator_disable(rdev_get_name(rdev)); | |
2821 | ||
967cfb18 | 2822 | if (rdev->ena_pin) { |
29d62ec5 DA |
2823 | if (rdev->ena_gpio_state) { |
2824 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2825 | if (ret < 0) | |
2826 | return ret; | |
2827 | rdev->ena_gpio_state = 0; | |
2828 | } | |
5c5659d0 MB |
2829 | |
2830 | } else if (rdev->desc->ops->disable) { | |
2831 | ret = rdev->desc->ops->disable(rdev); | |
2832 | if (ret != 0) | |
2833 | return ret; | |
2834 | } | |
2835 | ||
871f5650 | 2836 | if (rdev->desc->off_on_delay) |
a8ce7bd8 | 2837 | rdev->last_off = ktime_get(); |
871f5650 | 2838 | |
5c5659d0 MB |
2839 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2840 | ||
5c5659d0 MB |
2841 | return 0; |
2842 | } | |
2843 | ||
414c70cb | 2844 | /* locks held by regulator_disable() */ |
5451781d | 2845 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2846 | { |
5451781d | 2847 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2848 | int ret = 0; |
2849 | ||
f8702f9e | 2850 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2851 | |
cd94b505 | 2852 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2853 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2854 | return -EIO; |
2855 | ||
414c70cb | 2856 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2857 | if (rdev->use_count == 1 && |
2858 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2859 | |
2860 | /* we are last user */ | |
8a34e979 | 2861 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2862 | ret = _notifier_call_chain(rdev, |
2863 | REGULATOR_EVENT_PRE_DISABLE, | |
2864 | NULL); | |
2865 | if (ret & NOTIFY_STOP_MASK) | |
2866 | return -EINVAL; | |
2867 | ||
5c5659d0 | 2868 | ret = _regulator_do_disable(rdev); |
414c70cb | 2869 | if (ret < 0) { |
61aab5ad | 2870 | rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2871 | _notifier_call_chain(rdev, |
2872 | REGULATOR_EVENT_ABORT_DISABLE, | |
2873 | NULL); | |
414c70cb LG |
2874 | return ret; |
2875 | } | |
66fda75f MP |
2876 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2877 | NULL); | |
414c70cb LG |
2878 | } |
2879 | ||
414c70cb LG |
2880 | rdev->use_count = 0; |
2881 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2882 | rdev->use_count--; |
2883 | } | |
3801b86a | 2884 | |
5451781d DA |
2885 | if (ret == 0) |
2886 | ret = _regulator_handle_consumer_disable(regulator); | |
2887 | ||
f8702f9e DO |
2888 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2889 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2890 | ||
1fc12b05 | 2891 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2892 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2893 | |
414c70cb LG |
2894 | return ret; |
2895 | } | |
2896 | ||
2897 | /** | |
2898 | * regulator_disable - disable regulator output | |
2899 | * @regulator: regulator source | |
2900 | * | |
cf7bbcdf MB |
2901 | * Disable the regulator output voltage or current. Calls to |
2902 | * regulator_enable() must be balanced with calls to | |
2903 | * regulator_disable(). | |
69279fb9 | 2904 | * |
414c70cb | 2905 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2906 | * devices have it enabled, the regulator device supports disabling and |
2907 | * machine constraints permit this operation. | |
414c70cb LG |
2908 | */ |
2909 | int regulator_disable(struct regulator *regulator) | |
2910 | { | |
412aec61 | 2911 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2912 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2913 | int ret; |
6492bc1b | 2914 | |
f8702f9e | 2915 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2916 | ret = _regulator_disable(regulator); |
f8702f9e | 2917 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2918 | |
414c70cb LG |
2919 | return ret; |
2920 | } | |
2921 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2922 | ||
2923 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2924 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2925 | { |
2926 | int ret = 0; | |
2927 | ||
f8702f9e | 2928 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2929 | |
a1c8a551 RF |
2930 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2931 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2932 | if (ret & NOTIFY_STOP_MASK) | |
2933 | return -EINVAL; | |
2934 | ||
66fda75f MP |
2935 | ret = _regulator_do_disable(rdev); |
2936 | if (ret < 0) { | |
61aab5ad | 2937 | rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2938 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2939 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2940 | return ret; |
414c70cb LG |
2941 | } |
2942 | ||
66fda75f MP |
2943 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2944 | REGULATOR_EVENT_DISABLE, NULL); | |
2945 | ||
2946 | return 0; | |
414c70cb LG |
2947 | } |
2948 | ||
2949 | /** | |
2950 | * regulator_force_disable - force disable regulator output | |
2951 | * @regulator: regulator source | |
2952 | * | |
2953 | * Forcibly disable the regulator output voltage or current. | |
2954 | * NOTE: this *will* disable the regulator output even if other consumer | |
2955 | * devices have it enabled. This should be used for situations when device | |
2956 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2957 | */ | |
2958 | int regulator_force_disable(struct regulator *regulator) | |
2959 | { | |
82d15839 | 2960 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2961 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2962 | int ret; |
2963 | ||
f8702f9e | 2964 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2965 | |
3801b86a | 2966 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2967 | |
9243a195 MP |
2968 | if (rdev->coupling_desc.n_coupled > 1) |
2969 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2970 | |
2971 | if (regulator->uA_load) { | |
2972 | regulator->uA_load = 0; | |
2973 | ret = drms_uA_update(rdev); | |
2974 | } | |
2975 | ||
1fc12b05 DA |
2976 | if (rdev->use_count != 0 && rdev->supply) |
2977 | _regulator_disable(rdev->supply); | |
8cbf811d | 2978 | |
1fc12b05 | 2979 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2980 | |
414c70cb LG |
2981 | return ret; |
2982 | } | |
2983 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2984 | ||
da07ecd9 MB |
2985 | static void regulator_disable_work(struct work_struct *work) |
2986 | { | |
2987 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2988 | disable_work.work); | |
f8702f9e | 2989 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2990 | int count, i, ret; |
5451781d DA |
2991 | struct regulator *regulator; |
2992 | int total_count = 0; | |
da07ecd9 | 2993 | |
f8702f9e | 2994 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2995 | |
c9ccaa0c TR |
2996 | /* |
2997 | * Workqueue functions queue the new work instance while the previous | |
2998 | * work instance is being processed. Cancel the queued work instance | |
2999 | * as the work instance under processing does the job of the queued | |
3000 | * work instance. | |
3001 | */ | |
3002 | cancel_delayed_work(&rdev->disable_work); | |
3003 | ||
5451781d DA |
3004 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
3005 | count = regulator->deferred_disables; | |
3006 | ||
3007 | if (!count) | |
3008 | continue; | |
3009 | ||
3010 | total_count += count; | |
3011 | regulator->deferred_disables = 0; | |
3012 | ||
3013 | for (i = 0; i < count; i++) { | |
3014 | ret = _regulator_disable(regulator); | |
3015 | if (ret != 0) | |
61aab5ad MM |
3016 | rdev_err(rdev, "Deferred disable failed: %pe\n", |
3017 | ERR_PTR(ret)); | |
5451781d | 3018 | } |
da07ecd9 | 3019 | } |
5451781d | 3020 | WARN_ON(!total_count); |
da07ecd9 | 3021 | |
f8702f9e DO |
3022 | if (rdev->coupling_desc.n_coupled > 1) |
3023 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
3024 | ||
3025 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
3026 | } |
3027 | ||
3028 | /** | |
3029 | * regulator_disable_deferred - disable regulator output with delay | |
3030 | * @regulator: regulator source | |
48f1b4ef | 3031 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
3032 | * |
3033 | * Execute regulator_disable() on the regulator after a delay. This | |
3034 | * is intended for use with devices that require some time to quiesce. | |
3035 | * | |
3036 | * NOTE: this will only disable the regulator output if no other consumer | |
3037 | * devices have it enabled, the regulator device supports disabling and | |
3038 | * machine constraints permit this operation. | |
3039 | */ | |
3040 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
3041 | { | |
3042 | struct regulator_dev *rdev = regulator->rdev; | |
3043 | ||
2b5a24a0 MB |
3044 | if (!ms) |
3045 | return regulator_disable(regulator); | |
3046 | ||
66cf9a7e | 3047 | regulator_lock(rdev); |
5451781d | 3048 | regulator->deferred_disables++; |
c9ccaa0c TR |
3049 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
3050 | msecs_to_jiffies(ms)); | |
66cf9a7e | 3051 | regulator_unlock(rdev); |
da07ecd9 | 3052 | |
70dc6daf | 3053 | return 0; |
da07ecd9 MB |
3054 | } |
3055 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
3056 | ||
414c70cb LG |
3057 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
3058 | { | |
65f73508 | 3059 | /* A GPIO control always takes precedence */ |
7b74d149 | 3060 | if (rdev->ena_pin) |
65f73508 MB |
3061 | return rdev->ena_gpio_state; |
3062 | ||
9a7f6a4c | 3063 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 3064 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 3065 | return 1; |
414c70cb | 3066 | |
9332546f | 3067 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
3068 | } |
3069 | ||
3d67fe95 MP |
3070 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
3071 | unsigned selector, int lock) | |
3a40cfc3 | 3072 | { |
3a40cfc3 SH |
3073 | const struct regulator_ops *ops = rdev->desc->ops; |
3074 | int ret; | |
3075 | ||
3076 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
3077 | return rdev->desc->fixed_uV; | |
3078 | ||
3079 | if (ops->list_voltage) { | |
3080 | if (selector >= rdev->desc->n_voltages) | |
3081 | return -EINVAL; | |
55cca739 CB |
3082 | if (selector < rdev->desc->linear_min_sel) |
3083 | return 0; | |
3a40cfc3 | 3084 | if (lock) |
66cf9a7e | 3085 | regulator_lock(rdev); |
3a40cfc3 SH |
3086 | ret = ops->list_voltage(rdev, selector); |
3087 | if (lock) | |
66cf9a7e | 3088 | regulator_unlock(rdev); |
fd086045 | 3089 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
3090 | ret = _regulator_list_voltage(rdev->supply->rdev, |
3091 | selector, lock); | |
3a40cfc3 SH |
3092 | } else { |
3093 | return -EINVAL; | |
3094 | } | |
3095 | ||
3096 | if (ret > 0) { | |
3097 | if (ret < rdev->constraints->min_uV) | |
3098 | ret = 0; | |
3099 | else if (ret > rdev->constraints->max_uV) | |
3100 | ret = 0; | |
3101 | } | |
3102 | ||
3103 | return ret; | |
3104 | } | |
3105 | ||
414c70cb LG |
3106 | /** |
3107 | * regulator_is_enabled - is the regulator output enabled | |
3108 | * @regulator: regulator source | |
3109 | * | |
412aec61 DB |
3110 | * Returns positive if the regulator driver backing the source/client |
3111 | * has requested that the device be enabled, zero if it hasn't, else a | |
3112 | * negative errno code. | |
3113 | * | |
3114 | * Note that the device backing this regulator handle can have multiple | |
3115 | * users, so it might be enabled even if regulator_enable() was never | |
3116 | * called for this particular source. | |
414c70cb LG |
3117 | */ |
3118 | int regulator_is_enabled(struct regulator *regulator) | |
3119 | { | |
9332546f MB |
3120 | int ret; |
3121 | ||
6492bc1b MB |
3122 | if (regulator->always_on) |
3123 | return 1; | |
3124 | ||
f8702f9e | 3125 | regulator_lock(regulator->rdev); |
9332546f | 3126 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 3127 | regulator_unlock(regulator->rdev); |
9332546f MB |
3128 | |
3129 | return ret; | |
414c70cb LG |
3130 | } |
3131 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
3132 | ||
4367cfdc DB |
3133 | /** |
3134 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
3135 | * @regulator: regulator source | |
3136 | * | |
3137 | * Returns number of selectors, or negative errno. Selectors are | |
3138 | * numbered starting at zero, and typically correspond to bitfields | |
3139 | * in hardware registers. | |
3140 | */ | |
3141 | int regulator_count_voltages(struct regulator *regulator) | |
3142 | { | |
3143 | struct regulator_dev *rdev = regulator->rdev; | |
3144 | ||
26988efe JMC |
3145 | if (rdev->desc->n_voltages) |
3146 | return rdev->desc->n_voltages; | |
3147 | ||
fd086045 | 3148 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
3149 | return -EINVAL; |
3150 | ||
3151 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
3152 | } |
3153 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
3154 | ||
3155 | /** | |
3156 | * regulator_list_voltage - enumerate supported voltages | |
3157 | * @regulator: regulator source | |
3158 | * @selector: identify voltage to list | |
3159 | * Context: can sleep | |
3160 | * | |
3161 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 3162 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
3163 | * negative errno. |
3164 | */ | |
3165 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
3166 | { | |
3d67fe95 | 3167 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
3168 | } |
3169 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
3170 | ||
04eca28c TT |
3171 | /** |
3172 | * regulator_get_regmap - get the regulator's register map | |
3173 | * @regulator: regulator source | |
3174 | * | |
3175 | * Returns the register map for the given regulator, or an ERR_PTR value | |
3176 | * if the regulator doesn't use regmap. | |
3177 | */ | |
3178 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
3179 | { | |
3180 | struct regmap *map = regulator->rdev->regmap; | |
3181 | ||
3182 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
3183 | } | |
3184 | ||
3185 | /** | |
3186 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3187 | * @regulator: regulator source | |
3188 | * @vsel_reg: voltage selector register, output parameter | |
3189 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3190 | * | |
3191 | * Returns the hardware register offset and bitmask used for setting the | |
3192 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3193 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3194 | * for example. | |
3195 | * | |
3196 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3197 | * and 0 is returned, otherwise a negative errno is returned. | |
3198 | */ | |
3199 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3200 | unsigned *vsel_reg, | |
3201 | unsigned *vsel_mask) | |
3202 | { | |
39f5460d GX |
3203 | struct regulator_dev *rdev = regulator->rdev; |
3204 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3205 | |
3206 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3207 | return -EOPNOTSUPP; | |
3208 | ||
0d5c8633 CIK |
3209 | *vsel_reg = rdev->desc->vsel_reg; |
3210 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c | 3211 | |
be35cc46 | 3212 | return 0; |
04eca28c TT |
3213 | } |
3214 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3215 | ||
3216 | /** | |
3217 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3218 | * @regulator: regulator source | |
3219 | * @selector: identify voltage to list | |
3220 | * | |
3221 | * Converts the selector to a hardware-specific voltage selector that can be | |
3222 | * directly written to the regulator registers. The address of the voltage | |
3223 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3224 | * | |
3225 | * On error a negative errno is returned. | |
3226 | */ | |
3227 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3228 | unsigned selector) | |
3229 | { | |
39f5460d GX |
3230 | struct regulator_dev *rdev = regulator->rdev; |
3231 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3232 | |
3233 | if (selector >= rdev->desc->n_voltages) | |
3234 | return -EINVAL; | |
55cca739 CB |
3235 | if (selector < rdev->desc->linear_min_sel) |
3236 | return 0; | |
04eca28c TT |
3237 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) |
3238 | return -EOPNOTSUPP; | |
3239 | ||
3240 | return selector; | |
3241 | } | |
3242 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3243 | ||
2a668a8b PW |
3244 | /** |
3245 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3246 | * @regulator: regulator source | |
3247 | * | |
3248 | * Returns the voltage step size between VSEL values for linear | |
3249 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3250 | */ | |
3251 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3252 | { | |
3253 | struct regulator_dev *rdev = regulator->rdev; | |
3254 | ||
3255 | return rdev->desc->uV_step; | |
3256 | } | |
3257 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3258 | ||
a7a1ad90 MB |
3259 | /** |
3260 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3261 | * | |
3262 | * @regulator: Regulator to check. | |
3263 | * @min_uV: Minimum required voltage in uV. | |
3264 | * @max_uV: Maximum required voltage in uV. | |
3265 | * | |
49820944 | 3266 | * Returns a boolean. |
a7a1ad90 MB |
3267 | */ |
3268 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3269 | int min_uV, int max_uV) | |
3270 | { | |
c5f3939b | 3271 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3272 | int i, voltages, ret; |
3273 | ||
c5f3939b | 3274 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3275 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3276 | ret = regulator_get_voltage(regulator); |
3277 | if (ret >= 0) | |
0d25d09d | 3278 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3279 | else |
3280 | return ret; | |
3281 | } | |
3282 | ||
bd7a2b60 PM |
3283 | /* Any voltage within constrains range is fine? */ |
3284 | if (rdev->desc->continuous_voltage_range) | |
3285 | return min_uV >= rdev->constraints->min_uV && | |
3286 | max_uV <= rdev->constraints->max_uV; | |
3287 | ||
a7a1ad90 MB |
3288 | ret = regulator_count_voltages(regulator); |
3289 | if (ret < 0) | |
49820944 | 3290 | return 0; |
a7a1ad90 MB |
3291 | voltages = ret; |
3292 | ||
3293 | for (i = 0; i < voltages; i++) { | |
3294 | ret = regulator_list_voltage(regulator, i); | |
3295 | ||
3296 | if (ret >= min_uV && ret <= max_uV) | |
3297 | return 1; | |
3298 | } | |
3299 | ||
3300 | return 0; | |
3301 | } | |
a398eaa2 | 3302 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3303 | |
a204f41e SH |
3304 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3305 | int max_uV) | |
3306 | { | |
3307 | const struct regulator_desc *desc = rdev->desc; | |
3308 | ||
3309 | if (desc->ops->map_voltage) | |
3310 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3311 | ||
3312 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3313 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3314 | ||
3315 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3316 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3317 | ||
18e4b55f MV |
3318 | if (desc->ops->list_voltage == |
3319 | regulator_list_voltage_pickable_linear_range) | |
3320 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3321 | min_uV, max_uV); | |
3322 | ||
a204f41e SH |
3323 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3324 | } | |
3325 | ||
7179569a HS |
3326 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3327 | int min_uV, int max_uV, | |
3328 | unsigned *selector) | |
3329 | { | |
3330 | struct pre_voltage_change_data data; | |
3331 | int ret; | |
3332 | ||
d22b85a1 | 3333 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3334 | data.min_uV = min_uV; |
3335 | data.max_uV = max_uV; | |
3336 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3337 | &data); | |
3338 | if (ret & NOTIFY_STOP_MASK) | |
3339 | return -EINVAL; | |
3340 | ||
3341 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3342 | if (ret >= 0) | |
3343 | return ret; | |
3344 | ||
3345 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3346 | (void *)data.old_uV); | |
3347 | ||
3348 | return ret; | |
3349 | } | |
3350 | ||
3351 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3352 | int uV, unsigned selector) | |
3353 | { | |
3354 | struct pre_voltage_change_data data; | |
3355 | int ret; | |
3356 | ||
d22b85a1 | 3357 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3358 | data.min_uV = uV; |
3359 | data.max_uV = uV; | |
3360 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3361 | &data); | |
3362 | if (ret & NOTIFY_STOP_MASK) | |
3363 | return -EINVAL; | |
3364 | ||
3365 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3366 | if (ret >= 0) | |
3367 | return ret; | |
3368 | ||
3369 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3370 | (void *)data.old_uV); | |
3371 | ||
3372 | return ret; | |
3373 | } | |
3374 | ||
2da8d947 BG |
3375 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3376 | int uV, int new_selector) | |
3377 | { | |
3378 | const struct regulator_ops *ops = rdev->desc->ops; | |
3379 | int diff, old_sel, curr_sel, ret; | |
3380 | ||
3381 | /* Stepping is only needed if the regulator is enabled. */ | |
3382 | if (!_regulator_is_enabled(rdev)) | |
3383 | goto final_set; | |
3384 | ||
3385 | if (!ops->get_voltage_sel) | |
3386 | return -EINVAL; | |
3387 | ||
3388 | old_sel = ops->get_voltage_sel(rdev); | |
3389 | if (old_sel < 0) | |
3390 | return old_sel; | |
3391 | ||
3392 | diff = new_selector - old_sel; | |
3393 | if (diff == 0) | |
3394 | return 0; /* No change needed. */ | |
3395 | ||
3396 | if (diff > 0) { | |
3397 | /* Stepping up. */ | |
3398 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3399 | curr_sel < new_selector; | |
3400 | curr_sel += rdev->desc->vsel_step) { | |
3401 | /* | |
3402 | * Call the callback directly instead of using | |
3403 | * _regulator_call_set_voltage_sel() as we don't | |
3404 | * want to notify anyone yet. Same in the branch | |
3405 | * below. | |
3406 | */ | |
3407 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3408 | if (ret) | |
3409 | goto try_revert; | |
3410 | } | |
3411 | } else { | |
3412 | /* Stepping down. */ | |
3413 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3414 | curr_sel > new_selector; | |
3415 | curr_sel -= rdev->desc->vsel_step) { | |
3416 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3417 | if (ret) | |
3418 | goto try_revert; | |
3419 | } | |
3420 | } | |
3421 | ||
3422 | final_set: | |
3423 | /* The final selector will trigger the notifiers. */ | |
3424 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3425 | ||
3426 | try_revert: | |
3427 | /* | |
3428 | * At least try to return to the previous voltage if setting a new | |
3429 | * one failed. | |
3430 | */ | |
3431 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3432 | return ret; | |
3433 | } | |
3434 | ||
73e705bf MK |
3435 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3436 | int old_uV, int new_uV) | |
3437 | { | |
3438 | unsigned int ramp_delay = 0; | |
3439 | ||
3440 | if (rdev->constraints->ramp_delay) | |
3441 | ramp_delay = rdev->constraints->ramp_delay; | |
3442 | else if (rdev->desc->ramp_delay) | |
3443 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3444 | else if (rdev->constraints->settling_time) |
3445 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3446 | else if (rdev->constraints->settling_time_up && |
3447 | (new_uV > old_uV)) | |
3448 | return rdev->constraints->settling_time_up; | |
3449 | else if (rdev->constraints->settling_time_down && | |
3450 | (new_uV < old_uV)) | |
3451 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3452 | |
3453 | if (ramp_delay == 0) { | |
ba14fa1a | 3454 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3455 | return 0; |
3456 | } | |
3457 | ||
3458 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3459 | } | |
3460 | ||
75790251 MB |
3461 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3462 | int min_uV, int max_uV) | |
3463 | { | |
3464 | int ret; | |
77af1b26 | 3465 | int delay = 0; |
e113d792 | 3466 | int best_val = 0; |
75790251 | 3467 | unsigned int selector; |
eba41a5e | 3468 | int old_selector = -1; |
57995a48 | 3469 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3470 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3471 | |
3472 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3473 | ||
bf5892a8 MB |
3474 | min_uV += rdev->constraints->uV_offset; |
3475 | max_uV += rdev->constraints->uV_offset; | |
3476 | ||
eba41a5e AL |
3477 | /* |
3478 | * If we can't obtain the old selector there is not enough | |
3479 | * info to call set_voltage_time_sel(). | |
3480 | */ | |
8b7485ef | 3481 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3482 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3483 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3484 | if (old_selector < 0) |
3485 | return old_selector; | |
3486 | } | |
3487 | ||
57995a48 | 3488 | if (ops->set_voltage) { |
7179569a HS |
3489 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3490 | &selector); | |
e113d792 MB |
3491 | |
3492 | if (ret >= 0) { | |
57995a48 MK |
3493 | if (ops->list_voltage) |
3494 | best_val = ops->list_voltage(rdev, | |
3495 | selector); | |
e113d792 | 3496 | else |
d22b85a1 | 3497 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3498 | } |
3499 | ||
57995a48 | 3500 | } else if (ops->set_voltage_sel) { |
a204f41e | 3501 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3502 | if (ret >= 0) { |
57995a48 | 3503 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3504 | if (min_uV <= best_val && max_uV >= best_val) { |
3505 | selector = ret; | |
c66a566a AL |
3506 | if (old_selector == selector) |
3507 | ret = 0; | |
2da8d947 BG |
3508 | else if (rdev->desc->vsel_step) |
3509 | ret = _regulator_set_voltage_sel_step( | |
3510 | rdev, best_val, selector); | |
c66a566a | 3511 | else |
7179569a HS |
3512 | ret = _regulator_call_set_voltage_sel( |
3513 | rdev, best_val, selector); | |
e113d792 MB |
3514 | } else { |
3515 | ret = -EINVAL; | |
3516 | } | |
e8eef82b | 3517 | } |
75790251 MB |
3518 | } else { |
3519 | ret = -EINVAL; | |
3520 | } | |
e8eef82b | 3521 | |
31dfe686 MK |
3522 | if (ret) |
3523 | goto out; | |
77af1b26 | 3524 | |
73e705bf MK |
3525 | if (ops->set_voltage_time_sel) { |
3526 | /* | |
3527 | * Call set_voltage_time_sel if successfully obtained | |
3528 | * old_selector | |
3529 | */ | |
3530 | if (old_selector >= 0 && old_selector != selector) | |
3531 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3532 | selector); | |
3533 | } else { | |
3534 | if (old_uV != best_val) { | |
3535 | if (ops->set_voltage_time) | |
3536 | delay = ops->set_voltage_time(rdev, old_uV, | |
3537 | best_val); | |
3538 | else | |
3539 | delay = _regulator_set_voltage_time(rdev, | |
3540 | old_uV, | |
3541 | best_val); | |
e8eef82b | 3542 | } |
73e705bf | 3543 | } |
75790251 | 3544 | |
73e705bf | 3545 | if (delay < 0) { |
61aab5ad | 3546 | rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay)); |
73e705bf | 3547 | delay = 0; |
77af1b26 LW |
3548 | } |
3549 | ||
73e705bf MK |
3550 | /* Insert any necessary delays */ |
3551 | if (delay >= 1000) { | |
3552 | mdelay(delay / 1000); | |
3553 | udelay(delay % 1000); | |
3554 | } else if (delay) { | |
3555 | udelay(delay); | |
77af1b26 LW |
3556 | } |
3557 | ||
31dfe686 | 3558 | if (best_val >= 0) { |
2f6c797f AL |
3559 | unsigned long data = best_val; |
3560 | ||
ded06a52 | 3561 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3562 | (void *)data); |
3563 | } | |
ded06a52 | 3564 | |
31dfe686 | 3565 | out: |
eba41a5e | 3566 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3567 | |
3568 | return ret; | |
3569 | } | |
3570 | ||
f7efad10 CZ |
3571 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3572 | int min_uV, int max_uV, suspend_state_t state) | |
3573 | { | |
3574 | struct regulator_state *rstate; | |
3575 | int uV, sel; | |
3576 | ||
3577 | rstate = regulator_get_suspend_state(rdev, state); | |
3578 | if (rstate == NULL) | |
3579 | return -EINVAL; | |
3580 | ||
3581 | if (min_uV < rstate->min_uV) | |
3582 | min_uV = rstate->min_uV; | |
3583 | if (max_uV > rstate->max_uV) | |
3584 | max_uV = rstate->max_uV; | |
3585 | ||
3586 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3587 | if (sel < 0) | |
3588 | return sel; | |
3589 | ||
3590 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3591 | if (uV >= min_uV && uV <= max_uV) | |
3592 | rstate->uV = uV; | |
3593 | ||
3594 | return 0; | |
3595 | } | |
3596 | ||
a9f226bc | 3597 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3598 | int min_uV, int max_uV, |
3599 | suspend_state_t state) | |
414c70cb LG |
3600 | { |
3601 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3602 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3603 | int ret = 0; |
92d7a558 | 3604 | int old_min_uV, old_max_uV; |
c00dc359 | 3605 | int current_uV; |
414c70cb | 3606 | |
95a3c23a MB |
3607 | /* If we're setting the same range as last time the change |
3608 | * should be a noop (some cpufreq implementations use the same | |
3609 | * voltage for multiple frequencies, for example). | |
3610 | */ | |
c360a6df | 3611 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3612 | goto out; |
3613 | ||
c00dc359 | 3614 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3615 | * return successfully even though the regulator does not support |
c00dc359 BA |
3616 | * changing the voltage. |
3617 | */ | |
8a34e979 | 3618 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3619 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3620 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3621 | voltage->min_uV = min_uV; |
3622 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3623 | goto out; |
3624 | } | |
3625 | } | |
3626 | ||
414c70cb | 3627 | /* sanity check */ |
e8eef82b MB |
3628 | if (!rdev->desc->ops->set_voltage && |
3629 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3630 | ret = -EINVAL; |
3631 | goto out; | |
3632 | } | |
3633 | ||
3634 | /* constraints check */ | |
3635 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3636 | if (ret < 0) | |
3637 | goto out; | |
0d25d09d | 3638 | |
92d7a558 | 3639 | /* restore original values in case of error */ |
c360a6df CZ |
3640 | old_min_uV = voltage->min_uV; |
3641 | old_max_uV = voltage->max_uV; | |
3642 | voltage->min_uV = min_uV; | |
3643 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3644 | |
9243a195 MP |
3645 | /* for not coupled regulators this will just set the voltage */ |
3646 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3647 | if (ret < 0) { |
3648 | voltage->min_uV = old_min_uV; | |
3649 | voltage->max_uV = old_max_uV; | |
3650 | } | |
05fda3b1 | 3651 | |
9243a195 | 3652 | out: |
9243a195 MP |
3653 | return ret; |
3654 | } | |
3655 | ||
d22b85a1 DO |
3656 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3657 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3658 | { |
3659 | int best_supply_uV = 0; | |
3660 | int supply_change_uV = 0; | |
3661 | int ret; | |
3662 | ||
43fc99f2 MB |
3663 | if (rdev->supply && |
3664 | regulator_ops_is_valid(rdev->supply->rdev, | |
3665 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3666 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3667 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3668 | int current_supply_uV; |
3669 | int selector; | |
3670 | ||
3671 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3672 | if (selector < 0) { | |
3673 | ret = selector; | |
9243a195 | 3674 | goto out; |
fc42112c SH |
3675 | } |
3676 | ||
00cb9f4f | 3677 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3678 | if (best_supply_uV < 0) { |
3679 | ret = best_supply_uV; | |
9243a195 | 3680 | goto out; |
fc42112c SH |
3681 | } |
3682 | ||
3683 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3684 | ||
d22b85a1 | 3685 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3686 | if (current_supply_uV < 0) { |
3687 | ret = current_supply_uV; | |
9243a195 | 3688 | goto out; |
fc42112c SH |
3689 | } |
3690 | ||
3691 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3692 | } | |
3693 | ||
3694 | if (supply_change_uV > 0) { | |
3695 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3696 | best_supply_uV, INT_MAX, state); |
fc42112c | 3697 | if (ret) { |
61aab5ad MM |
3698 | dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n", |
3699 | ERR_PTR(ret)); | |
9243a195 | 3700 | goto out; |
fc42112c SH |
3701 | } |
3702 | } | |
3703 | ||
f7efad10 CZ |
3704 | if (state == PM_SUSPEND_ON) |
3705 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3706 | else | |
3707 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3708 | max_uV, state); | |
92d7a558 | 3709 | if (ret < 0) |
9243a195 | 3710 | goto out; |
0d25d09d | 3711 | |
fc42112c SH |
3712 | if (supply_change_uV < 0) { |
3713 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3714 | best_supply_uV, INT_MAX, state); |
fc42112c | 3715 | if (ret) |
61aab5ad MM |
3716 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n", |
3717 | ERR_PTR(ret)); | |
fc42112c SH |
3718 | /* No need to fail here */ |
3719 | ret = 0; | |
3720 | } | |
3721 | ||
414c70cb | 3722 | out: |
a9f226bc | 3723 | return ret; |
69686176 | 3724 | } |
3d7610e8 | 3725 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3726 | |
85254bcf DO |
3727 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3728 | int *current_uV, int *min_uV) | |
3729 | { | |
3730 | struct regulation_constraints *constraints = rdev->constraints; | |
3731 | ||
3732 | /* Limit voltage change only if necessary */ | |
3733 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3734 | return 1; | |
3735 | ||
3736 | if (*current_uV < 0) { | |
d22b85a1 | 3737 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3738 | |
3739 | if (*current_uV < 0) | |
3740 | return *current_uV; | |
3741 | } | |
3742 | ||
3743 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3744 | return 1; | |
3745 | ||
3746 | /* Clamp target voltage within the given step */ | |
3747 | if (*current_uV < *min_uV) | |
3748 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3749 | *min_uV); | |
3750 | else | |
3751 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3752 | *min_uV); | |
3753 | ||
3754 | return 0; | |
3755 | } | |
3756 | ||
c054c6c7 MP |
3757 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3758 | int *current_uV, | |
3759 | int *min_uV, int *max_uV, | |
3760 | suspend_state_t state, | |
3761 | int n_coupled) | |
3762 | { | |
3763 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3764 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3765 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3766 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3767 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3768 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3769 | int i, ret, max_spread; |
c054c6c7 MP |
3770 | bool done; |
3771 | ||
3772 | *current_uV = -1; | |
3773 | ||
3774 | /* | |
3775 | * If there are no coupled regulators, simply set the voltage | |
3776 | * demanded by consumers. | |
3777 | */ | |
3778 | if (n_coupled == 1) { | |
3779 | /* | |
3780 | * If consumers don't provide any demands, set voltage | |
3781 | * to min_uV | |
3782 | */ | |
3783 | desired_min_uV = constraints->min_uV; | |
3784 | desired_max_uV = constraints->max_uV; | |
3785 | ||
3786 | ret = regulator_check_consumers(rdev, | |
3787 | &desired_min_uV, | |
3788 | &desired_max_uV, state); | |
3789 | if (ret < 0) | |
3790 | return ret; | |
3791 | ||
3792 | possible_uV = desired_min_uV; | |
3793 | done = true; | |
3794 | ||
3795 | goto finish; | |
3796 | } | |
3797 | ||
3798 | /* Find highest min desired voltage */ | |
3799 | for (i = 0; i < n_coupled; i++) { | |
3800 | int tmp_min = 0; | |
3801 | int tmp_max = INT_MAX; | |
3802 | ||
f8702f9e | 3803 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3804 | |
3805 | ret = regulator_check_consumers(c_rdevs[i], | |
3806 | &tmp_min, | |
3807 | &tmp_max, state); | |
3808 | if (ret < 0) | |
3809 | return ret; | |
3810 | ||
3811 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3812 | if (ret < 0) | |
3813 | return ret; | |
69686176 | 3814 | |
c054c6c7 MP |
3815 | highest_min_uV = max(highest_min_uV, tmp_min); |
3816 | ||
3817 | if (i == 0) { | |
3818 | desired_min_uV = tmp_min; | |
3819 | desired_max_uV = tmp_max; | |
3820 | } | |
3821 | } | |
3822 | ||
d8ca7d18 DO |
3823 | max_spread = constraints->max_spread[0]; |
3824 | ||
c054c6c7 MP |
3825 | /* |
3826 | * Let target_uV be equal to the desired one if possible. | |
3827 | * If not, set it to minimum voltage, allowed by other coupled | |
3828 | * regulators. | |
3829 | */ | |
3830 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3831 | ||
3832 | /* | |
3833 | * Find min and max voltages, which currently aren't violating | |
3834 | * max_spread. | |
3835 | */ | |
3836 | for (i = 1; i < n_coupled; i++) { | |
3837 | int tmp_act; | |
3838 | ||
3839 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3840 | continue; | |
3841 | ||
d22b85a1 | 3842 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3843 | if (tmp_act < 0) |
3844 | return tmp_act; | |
3845 | ||
3846 | min_current_uV = min(tmp_act, min_current_uV); | |
3847 | max_current_uV = max(tmp_act, max_current_uV); | |
3848 | } | |
3849 | ||
3850 | /* There aren't any other regulators enabled */ | |
3851 | if (max_current_uV == 0) { | |
3852 | possible_uV = target_uV; | |
3853 | } else { | |
3854 | /* | |
3855 | * Correct target voltage, so as it currently isn't | |
3856 | * violating max_spread | |
3857 | */ | |
3858 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3859 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3860 | } | |
3861 | ||
3862 | if (possible_uV > desired_max_uV) | |
3863 | return -EINVAL; | |
3864 | ||
3865 | done = (possible_uV == target_uV); | |
3866 | desired_min_uV = possible_uV; | |
3867 | ||
3868 | finish: | |
85254bcf DO |
3869 | /* Apply max_uV_step constraint if necessary */ |
3870 | if (state == PM_SUSPEND_ON) { | |
3871 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3872 | &desired_min_uV); | |
3873 | if (ret < 0) | |
3874 | return ret; | |
3875 | ||
3876 | if (ret == 0) | |
3877 | done = false; | |
3878 | } | |
3879 | ||
c054c6c7 MP |
3880 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3881 | if (n_coupled > 1 && *current_uV == -1) { | |
3882 | ||
3883 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3884 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3885 | if (ret < 0) |
3886 | return ret; | |
3887 | ||
3888 | *current_uV = ret; | |
3889 | } else { | |
3890 | *current_uV = desired_min_uV; | |
3891 | } | |
3892 | } | |
3893 | ||
3894 | *min_uV = desired_min_uV; | |
3895 | *max_uV = desired_max_uV; | |
3896 | ||
3897 | return done; | |
3898 | } | |
3899 | ||
752db83a MS |
3900 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3901 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3902 | { |
3903 | struct regulator_dev **c_rdevs; | |
3904 | struct regulator_dev *best_rdev; | |
3905 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3906 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3907 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3908 | unsigned long c_rdev_done = 0; |
3909 | bool best_c_rdev_done; | |
c054c6c7 MP |
3910 | |
3911 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3912 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3913 | |
3914 | /* | |
3915 | * Find the best possible voltage change on each loop. Leave the loop | |
3916 | * if there isn't any possible change. | |
3917 | */ | |
3918 | do { | |
3919 | best_c_rdev_done = false; | |
3920 | best_delta = 0; | |
3921 | best_min_uV = 0; | |
3922 | best_max_uV = 0; | |
3923 | best_c_rdev = 0; | |
3924 | best_rdev = NULL; | |
3925 | ||
3926 | /* | |
3927 | * Find highest difference between optimal voltage | |
3928 | * and current voltage. | |
3929 | */ | |
3930 | for (i = 0; i < n_coupled; i++) { | |
3931 | /* | |
3932 | * optimal_uV is the best voltage that can be set for | |
3933 | * i-th regulator at the moment without violating | |
3934 | * max_spread constraint in order to balance | |
3935 | * the coupled voltages. | |
3936 | */ | |
3937 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3938 | ||
d8ca7d18 | 3939 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
3940 | continue; |
3941 | ||
3942 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3943 | ¤t_uV, | |
3944 | &optimal_uV, | |
3945 | &optimal_max_uV, | |
3946 | state, n_coupled); | |
3947 | if (ret < 0) | |
3948 | goto out; | |
3949 | ||
3950 | delta = abs(optimal_uV - current_uV); | |
3951 | ||
3952 | if (delta && best_delta <= delta) { | |
3953 | best_c_rdev_done = ret; | |
3954 | best_delta = delta; | |
3955 | best_rdev = c_rdevs[i]; | |
3956 | best_min_uV = optimal_uV; | |
3957 | best_max_uV = optimal_max_uV; | |
3958 | best_c_rdev = i; | |
3959 | } | |
3960 | } | |
3961 | ||
3962 | /* Nothing to change, return successfully */ | |
3963 | if (!best_rdev) { | |
3964 | ret = 0; | |
3965 | goto out; | |
3966 | } | |
9243a195 | 3967 | |
c054c6c7 MP |
3968 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3969 | best_max_uV, state); | |
9243a195 | 3970 | |
c054c6c7 MP |
3971 | if (ret < 0) |
3972 | goto out; | |
3973 | ||
d8ca7d18 DO |
3974 | if (best_c_rdev_done) |
3975 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
3976 | |
3977 | } while (n_coupled > 1); | |
3978 | ||
3979 | out: | |
69686176 MP |
3980 | return ret; |
3981 | } | |
3982 | ||
752db83a MS |
3983 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
3984 | suspend_state_t state) | |
3985 | { | |
3986 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3987 | struct regulator_coupler *coupler = c_desc->coupler; | |
3988 | bool skip_coupled = false; | |
3989 | ||
3990 | /* | |
3991 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3992 | * other coupled regulators. | |
3993 | */ | |
3994 | if (state != PM_SUSPEND_ON) | |
3995 | skip_coupled = true; | |
3996 | ||
3997 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
3998 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3999 | return -EPERM; | |
4000 | } | |
4001 | ||
4002 | /* Invoke custom balancer for customized couplers */ | |
4003 | if (coupler && coupler->balance_voltage) | |
4004 | return coupler->balance_voltage(coupler, rdev, state); | |
4005 | ||
4006 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
4007 | } | |
4008 | ||
a9f226bc SH |
4009 | /** |
4010 | * regulator_set_voltage - set regulator output voltage | |
4011 | * @regulator: regulator source | |
4012 | * @min_uV: Minimum required voltage in uV | |
4013 | * @max_uV: Maximum acceptable voltage in uV | |
4014 | * | |
4015 | * Sets a voltage regulator to the desired output voltage. This can be set | |
4016 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
4017 | * | |
4018 | * If the regulator is enabled then the voltage will change to the new value | |
4019 | * immediately otherwise if the regulator is disabled the regulator will | |
4020 | * output at the new voltage when enabled. | |
4021 | * | |
4022 | * NOTE: If the regulator is shared between several devices then the lowest | |
4023 | * request voltage that meets the system constraints will be used. | |
4024 | * Regulator system constraints must be set for this regulator before | |
4025 | * calling this function otherwise this call will fail. | |
4026 | */ | |
4027 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
4028 | { | |
f8702f9e DO |
4029 | struct ww_acquire_ctx ww_ctx; |
4030 | int ret; | |
a9f226bc | 4031 | |
f8702f9e | 4032 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 4033 | |
c360a6df CZ |
4034 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
4035 | PM_SUSPEND_ON); | |
a9f226bc | 4036 | |
f8702f9e | 4037 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 4038 | |
414c70cb LG |
4039 | return ret; |
4040 | } | |
4041 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
4042 | ||
f7efad10 CZ |
4043 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
4044 | suspend_state_t state, bool en) | |
4045 | { | |
4046 | struct regulator_state *rstate; | |
4047 | ||
4048 | rstate = regulator_get_suspend_state(rdev, state); | |
4049 | if (rstate == NULL) | |
4050 | return -EINVAL; | |
4051 | ||
4052 | if (!rstate->changeable) | |
4053 | return -EPERM; | |
4054 | ||
3edd79cf | 4055 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
4056 | |
4057 | return 0; | |
4058 | } | |
4059 | ||
4060 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
4061 | suspend_state_t state) | |
4062 | { | |
4063 | return regulator_suspend_toggle(rdev, state, true); | |
4064 | } | |
4065 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
4066 | ||
4067 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
4068 | suspend_state_t state) | |
4069 | { | |
4070 | struct regulator *regulator; | |
4071 | struct regulator_voltage *voltage; | |
4072 | ||
4073 | /* | |
4074 | * if any consumer wants this regulator device keeping on in | |
4075 | * suspend states, don't set it as disabled. | |
4076 | */ | |
4077 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4078 | voltage = ®ulator->voltage[state]; | |
4079 | if (voltage->min_uV || voltage->max_uV) | |
4080 | return 0; | |
4081 | } | |
4082 | ||
4083 | return regulator_suspend_toggle(rdev, state, false); | |
4084 | } | |
4085 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
4086 | ||
4087 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
4088 | int min_uV, int max_uV, | |
4089 | suspend_state_t state) | |
4090 | { | |
4091 | struct regulator_dev *rdev = regulator->rdev; | |
4092 | struct regulator_state *rstate; | |
4093 | ||
4094 | rstate = regulator_get_suspend_state(rdev, state); | |
4095 | if (rstate == NULL) | |
4096 | return -EINVAL; | |
4097 | ||
4098 | if (rstate->min_uV == rstate->max_uV) { | |
4099 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
4100 | return -EPERM; | |
4101 | } | |
4102 | ||
4103 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
4104 | } | |
4105 | ||
4106 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
4107 | int max_uV, suspend_state_t state) | |
4108 | { | |
f8702f9e DO |
4109 | struct ww_acquire_ctx ww_ctx; |
4110 | int ret; | |
f7efad10 CZ |
4111 | |
4112 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
4113 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
4114 | return -EINVAL; | |
4115 | ||
f8702f9e | 4116 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4117 | |
4118 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
4119 | max_uV, state); | |
4120 | ||
f8702f9e | 4121 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4122 | |
4123 | return ret; | |
4124 | } | |
4125 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
4126 | ||
88cd222b LW |
4127 | /** |
4128 | * regulator_set_voltage_time - get raise/fall time | |
4129 | * @regulator: regulator source | |
4130 | * @old_uV: starting voltage in microvolts | |
4131 | * @new_uV: target voltage in microvolts | |
4132 | * | |
4133 | * Provided with the starting and ending voltage, this function attempts to | |
4134 | * calculate the time in microseconds required to rise or fall to this new | |
4135 | * voltage. | |
4136 | */ | |
4137 | int regulator_set_voltage_time(struct regulator *regulator, | |
4138 | int old_uV, int new_uV) | |
4139 | { | |
272e2315 GX |
4140 | struct regulator_dev *rdev = regulator->rdev; |
4141 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
4142 | int old_sel = -1; |
4143 | int new_sel = -1; | |
4144 | int voltage; | |
4145 | int i; | |
4146 | ||
73e705bf MK |
4147 | if (ops->set_voltage_time) |
4148 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
4149 | else if (!ops->set_voltage_time_sel) | |
4150 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
4151 | ||
88cd222b | 4152 | /* Currently requires operations to do this */ |
73e705bf | 4153 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
4154 | return -EINVAL; |
4155 | ||
4156 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
4157 | /* We only look for exact voltage matches here */ | |
bdcd1177 CB |
4158 | if (i < rdev->desc->linear_min_sel) |
4159 | continue; | |
4160 | ||
ab97800e CB |
4161 | if (old_sel >= 0 && new_sel >= 0) |
4162 | break; | |
4163 | ||
88cd222b LW |
4164 | voltage = regulator_list_voltage(regulator, i); |
4165 | if (voltage < 0) | |
4166 | return -EINVAL; | |
4167 | if (voltage == 0) | |
4168 | continue; | |
4169 | if (voltage == old_uV) | |
4170 | old_sel = i; | |
4171 | if (voltage == new_uV) | |
4172 | new_sel = i; | |
4173 | } | |
4174 | ||
4175 | if (old_sel < 0 || new_sel < 0) | |
4176 | return -EINVAL; | |
4177 | ||
4178 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
4179 | } | |
4180 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
4181 | ||
98a175b6 | 4182 | /** |
296c6566 RD |
4183 | * regulator_set_voltage_time_sel - get raise/fall time |
4184 | * @rdev: regulator source device | |
98a175b6 YSB |
4185 | * @old_selector: selector for starting voltage |
4186 | * @new_selector: selector for target voltage | |
4187 | * | |
4188 | * Provided with the starting and target voltage selectors, this function | |
4189 | * returns time in microseconds required to rise or fall to this new voltage | |
4190 | * | |
f11d08c3 | 4191 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4192 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4193 | */ |
4194 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4195 | unsigned int old_selector, | |
4196 | unsigned int new_selector) | |
4197 | { | |
f11d08c3 | 4198 | int old_volt, new_volt; |
398715ab | 4199 | |
f11d08c3 AL |
4200 | /* sanity check */ |
4201 | if (!rdev->desc->ops->list_voltage) | |
4202 | return -EINVAL; | |
398715ab | 4203 | |
f11d08c3 AL |
4204 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4205 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4206 | ||
73e705bf MK |
4207 | if (rdev->desc->ops->set_voltage_time) |
4208 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4209 | new_volt); | |
4210 | else | |
4211 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4212 | } |
b19dbf71 | 4213 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4214 | |
380d2b2d DO |
4215 | int regulator_sync_voltage_rdev(struct regulator_dev *rdev) |
4216 | { | |
4217 | int ret; | |
4218 | ||
4219 | regulator_lock(rdev); | |
4220 | ||
4221 | if (!rdev->desc->ops->set_voltage && | |
4222 | !rdev->desc->ops->set_voltage_sel) { | |
4223 | ret = -EINVAL; | |
4224 | goto out; | |
4225 | } | |
4226 | ||
4227 | /* balance only, if regulator is coupled */ | |
4228 | if (rdev->coupling_desc.n_coupled > 1) | |
4229 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4230 | else | |
4231 | ret = -EOPNOTSUPP; | |
4232 | ||
4233 | out: | |
4234 | regulator_unlock(rdev); | |
4235 | return ret; | |
4236 | } | |
4237 | ||
606a2562 MB |
4238 | /** |
4239 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4240 | * @regulator: regulator source | |
4241 | * | |
4242 | * Re-apply the last configured voltage. This is intended to be used | |
4243 | * where some external control source the consumer is cooperating with | |
4244 | * has caused the configured voltage to change. | |
4245 | */ | |
4246 | int regulator_sync_voltage(struct regulator *regulator) | |
4247 | { | |
4248 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4249 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4250 | int ret, min_uV, max_uV; |
4251 | ||
66cf9a7e | 4252 | regulator_lock(rdev); |
606a2562 MB |
4253 | |
4254 | if (!rdev->desc->ops->set_voltage && | |
4255 | !rdev->desc->ops->set_voltage_sel) { | |
4256 | ret = -EINVAL; | |
4257 | goto out; | |
4258 | } | |
4259 | ||
4260 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4261 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4262 | ret = -EINVAL; |
4263 | goto out; | |
4264 | } | |
4265 | ||
c360a6df CZ |
4266 | min_uV = voltage->min_uV; |
4267 | max_uV = voltage->max_uV; | |
606a2562 MB |
4268 | |
4269 | /* This should be a paranoia check... */ | |
4270 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4271 | if (ret < 0) | |
4272 | goto out; | |
4273 | ||
c360a6df | 4274 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4275 | if (ret < 0) |
4276 | goto out; | |
4277 | ||
24be0c71 DO |
4278 | /* balance only, if regulator is coupled */ |
4279 | if (rdev->coupling_desc.n_coupled > 1) | |
4280 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4281 | else | |
4282 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
606a2562 MB |
4283 | |
4284 | out: | |
66cf9a7e | 4285 | regulator_unlock(rdev); |
606a2562 MB |
4286 | return ret; |
4287 | } | |
4288 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4289 | ||
d22b85a1 | 4290 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4291 | { |
bf5892a8 | 4292 | int sel, ret; |
fef95019 MB |
4293 | bool bypassed; |
4294 | ||
4295 | if (rdev->desc->ops->get_bypass) { | |
4296 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4297 | if (ret < 0) | |
4298 | return ret; | |
4299 | if (bypassed) { | |
4300 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4301 | if (!rdev->supply) { |
4302 | rdev_err(rdev, | |
4303 | "bypassed regulator has no supply!\n"); | |
4304 | return -EPROBE_DEFER; | |
4305 | } | |
fef95019 | 4306 | |
d22b85a1 | 4307 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4308 | } |
4309 | } | |
476c2d83 MB |
4310 | |
4311 | if (rdev->desc->ops->get_voltage_sel) { | |
4312 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4313 | if (sel < 0) | |
4314 | return sel; | |
bf5892a8 | 4315 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4316 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4317 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4318 | } else if (rdev->desc->ops->list_voltage) { |
4319 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4320 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4321 | ret = rdev->desc->fixed_uV; | |
e303996e | 4322 | } else if (rdev->supply) { |
d22b85a1 | 4323 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cf1ad559 MM |
4324 | } else if (rdev->supply_name) { |
4325 | return -EPROBE_DEFER; | |
cb220d16 | 4326 | } else { |
414c70cb | 4327 | return -EINVAL; |
cb220d16 | 4328 | } |
bf5892a8 | 4329 | |
cb220d16 AL |
4330 | if (ret < 0) |
4331 | return ret; | |
bf5892a8 | 4332 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4333 | } |
3d7610e8 | 4334 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4335 | |
4336 | /** | |
4337 | * regulator_get_voltage - get regulator output voltage | |
4338 | * @regulator: regulator source | |
4339 | * | |
4340 | * This returns the current regulator voltage in uV. | |
4341 | * | |
4342 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4343 | * function should not be used to determine regulator state. | |
4344 | */ | |
4345 | int regulator_get_voltage(struct regulator *regulator) | |
4346 | { | |
f8702f9e | 4347 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4348 | int ret; |
4349 | ||
f8702f9e | 4350 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4351 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4352 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4353 | |
4354 | return ret; | |
4355 | } | |
4356 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4357 | ||
4358 | /** | |
4359 | * regulator_set_current_limit - set regulator output current limit | |
4360 | * @regulator: regulator source | |
ce0d10f8 | 4361 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4362 | * @max_uA: Maximum supported current in uA |
4363 | * | |
4364 | * Sets current sink to the desired output current. This can be set during | |
4365 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4366 | * | |
4367 | * If the regulator is enabled then the current will change to the new value | |
4368 | * immediately otherwise if the regulator is disabled the regulator will | |
4369 | * output at the new current when enabled. | |
4370 | * | |
4371 | * NOTE: Regulator system constraints must be set for this regulator before | |
4372 | * calling this function otherwise this call will fail. | |
4373 | */ | |
4374 | int regulator_set_current_limit(struct regulator *regulator, | |
4375 | int min_uA, int max_uA) | |
4376 | { | |
4377 | struct regulator_dev *rdev = regulator->rdev; | |
4378 | int ret; | |
4379 | ||
66cf9a7e | 4380 | regulator_lock(rdev); |
414c70cb LG |
4381 | |
4382 | /* sanity check */ | |
4383 | if (!rdev->desc->ops->set_current_limit) { | |
4384 | ret = -EINVAL; | |
4385 | goto out; | |
4386 | } | |
4387 | ||
4388 | /* constraints check */ | |
4389 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4390 | if (ret < 0) | |
4391 | goto out; | |
4392 | ||
4393 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4394 | out: | |
66cf9a7e | 4395 | regulator_unlock(rdev); |
414c70cb LG |
4396 | return ret; |
4397 | } | |
4398 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4399 | ||
7e4d9683 DA |
4400 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4401 | { | |
4402 | /* sanity check */ | |
4403 | if (!rdev->desc->ops->get_current_limit) | |
4404 | return -EINVAL; | |
4405 | ||
4406 | return rdev->desc->ops->get_current_limit(rdev); | |
4407 | } | |
4408 | ||
414c70cb LG |
4409 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4410 | { | |
4411 | int ret; | |
4412 | ||
66cf9a7e | 4413 | regulator_lock(rdev); |
7e4d9683 | 4414 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4415 | regulator_unlock(rdev); |
7e4d9683 | 4416 | |
414c70cb LG |
4417 | return ret; |
4418 | } | |
4419 | ||
4420 | /** | |
4421 | * regulator_get_current_limit - get regulator output current | |
4422 | * @regulator: regulator source | |
4423 | * | |
4424 | * This returns the current supplied by the specified current sink in uA. | |
4425 | * | |
4426 | * NOTE: If the regulator is disabled it will return the current value. This | |
4427 | * function should not be used to determine regulator state. | |
4428 | */ | |
4429 | int regulator_get_current_limit(struct regulator *regulator) | |
4430 | { | |
4431 | return _regulator_get_current_limit(regulator->rdev); | |
4432 | } | |
4433 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4434 | ||
4435 | /** | |
4436 | * regulator_set_mode - set regulator operating mode | |
4437 | * @regulator: regulator source | |
4438 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4439 | * | |
4440 | * Set regulator operating mode to increase regulator efficiency or improve | |
4441 | * regulation performance. | |
4442 | * | |
4443 | * NOTE: Regulator system constraints must be set for this regulator before | |
4444 | * calling this function otherwise this call will fail. | |
4445 | */ | |
4446 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4447 | { | |
4448 | struct regulator_dev *rdev = regulator->rdev; | |
4449 | int ret; | |
500b4ac9 | 4450 | int regulator_curr_mode; |
414c70cb | 4451 | |
66cf9a7e | 4452 | regulator_lock(rdev); |
414c70cb LG |
4453 | |
4454 | /* sanity check */ | |
4455 | if (!rdev->desc->ops->set_mode) { | |
4456 | ret = -EINVAL; | |
4457 | goto out; | |
4458 | } | |
4459 | ||
500b4ac9 SI |
4460 | /* return if the same mode is requested */ |
4461 | if (rdev->desc->ops->get_mode) { | |
4462 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4463 | if (regulator_curr_mode == mode) { | |
4464 | ret = 0; | |
4465 | goto out; | |
4466 | } | |
4467 | } | |
4468 | ||
414c70cb | 4469 | /* constraints check */ |
22c51b47 | 4470 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4471 | if (ret < 0) |
4472 | goto out; | |
4473 | ||
4474 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4475 | out: | |
66cf9a7e | 4476 | regulator_unlock(rdev); |
414c70cb LG |
4477 | return ret; |
4478 | } | |
4479 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4480 | ||
7e4d9683 DA |
4481 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4482 | { | |
4483 | /* sanity check */ | |
4484 | if (!rdev->desc->ops->get_mode) | |
4485 | return -EINVAL; | |
4486 | ||
4487 | return rdev->desc->ops->get_mode(rdev); | |
4488 | } | |
4489 | ||
414c70cb LG |
4490 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4491 | { | |
4492 | int ret; | |
4493 | ||
66cf9a7e | 4494 | regulator_lock(rdev); |
7e4d9683 | 4495 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4496 | regulator_unlock(rdev); |
7e4d9683 | 4497 | |
414c70cb LG |
4498 | return ret; |
4499 | } | |
4500 | ||
4501 | /** | |
4502 | * regulator_get_mode - get regulator operating mode | |
4503 | * @regulator: regulator source | |
4504 | * | |
4505 | * Get the current regulator operating mode. | |
4506 | */ | |
4507 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4508 | { | |
4509 | return _regulator_get_mode(regulator->rdev); | |
4510 | } | |
4511 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4512 | ||
7111c6d1 MV |
4513 | static int rdev_get_cached_err_flags(struct regulator_dev *rdev) |
4514 | { | |
4515 | int ret = 0; | |
4516 | ||
4517 | if (rdev->use_cached_err) { | |
4518 | spin_lock(&rdev->err_lock); | |
4519 | ret = rdev->cached_err; | |
4520 | spin_unlock(&rdev->err_lock); | |
4521 | } | |
4522 | return ret; | |
4523 | } | |
4524 | ||
1b5b4221 AH |
4525 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4526 | unsigned int *flags) | |
4527 | { | |
7111c6d1 | 4528 | int cached_flags, ret = 0; |
1b5b4221 | 4529 | |
66cf9a7e | 4530 | regulator_lock(rdev); |
1b5b4221 | 4531 | |
7111c6d1 MV |
4532 | cached_flags = rdev_get_cached_err_flags(rdev); |
4533 | ||
4534 | if (rdev->desc->ops->get_error_flags) | |
4535 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4536 | else if (!rdev->use_cached_err) | |
1b5b4221 | 4537 | ret = -EINVAL; |
1b5b4221 | 4538 | |
7111c6d1 MV |
4539 | *flags |= cached_flags; |
4540 | ||
66cf9a7e | 4541 | regulator_unlock(rdev); |
7111c6d1 | 4542 | |
1b5b4221 AH |
4543 | return ret; |
4544 | } | |
4545 | ||
4546 | /** | |
4547 | * regulator_get_error_flags - get regulator error information | |
4548 | * @regulator: regulator source | |
4549 | * @flags: pointer to store error flags | |
4550 | * | |
4551 | * Get the current regulator error information. | |
4552 | */ | |
4553 | int regulator_get_error_flags(struct regulator *regulator, | |
4554 | unsigned int *flags) | |
4555 | { | |
4556 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4557 | } | |
4558 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4559 | ||
414c70cb | 4560 | /** |
e39ce48f | 4561 | * regulator_set_load - set regulator load |
414c70cb LG |
4562 | * @regulator: regulator source |
4563 | * @uA_load: load current | |
4564 | * | |
4565 | * Notifies the regulator core of a new device load. This is then used by | |
4566 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4567 | * operating mode for the new regulator loading. | |
4568 | * | |
4569 | * Consumer devices notify their supply regulator of the maximum power | |
4570 | * they will require (can be taken from device datasheet in the power | |
4571 | * consumption tables) when they change operational status and hence power | |
4572 | * state. Examples of operational state changes that can affect power | |
4573 | * consumption are :- | |
4574 | * | |
4575 | * o Device is opened / closed. | |
4576 | * o Device I/O is about to begin or has just finished. | |
4577 | * o Device is idling in between work. | |
4578 | * | |
4579 | * This information is also exported via sysfs to userspace. | |
4580 | * | |
4581 | * DRMS will sum the total requested load on the regulator and change | |
4582 | * to the most efficient operating mode if platform constraints allow. | |
4583 | * | |
5451781d DA |
4584 | * NOTE: when a regulator consumer requests to have a regulator |
4585 | * disabled then any load that consumer requested no longer counts | |
4586 | * toward the total requested load. If the regulator is re-enabled | |
4587 | * then the previously requested load will start counting again. | |
4588 | * | |
4589 | * If a regulator is an always-on regulator then an individual consumer's | |
4590 | * load will still be removed if that consumer is fully disabled. | |
4591 | * | |
e39ce48f | 4592 | * On error a negative errno is returned. |
414c70cb | 4593 | */ |
e39ce48f | 4594 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4595 | { |
4596 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4597 | int old_uA_load; |
4598 | int ret = 0; | |
d92d95b6 | 4599 | |
66cf9a7e | 4600 | regulator_lock(rdev); |
5451781d | 4601 | old_uA_load = regulator->uA_load; |
414c70cb | 4602 | regulator->uA_load = uA_load; |
5451781d DA |
4603 | if (regulator->enable_count && old_uA_load != uA_load) { |
4604 | ret = drms_uA_update(rdev); | |
4605 | if (ret < 0) | |
4606 | regulator->uA_load = old_uA_load; | |
4607 | } | |
66cf9a7e | 4608 | regulator_unlock(rdev); |
8460ef38 | 4609 | |
414c70cb LG |
4610 | return ret; |
4611 | } | |
e39ce48f | 4612 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4613 | |
f59c8f9f MB |
4614 | /** |
4615 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4616 | * | |
4617 | * @regulator: Regulator to configure | |
9345dfb8 | 4618 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4619 | * |
4620 | * Allow the regulator to go into bypass mode if all other consumers | |
4621 | * for the regulator also enable bypass mode and the machine | |
4622 | * constraints allow this. Bypass mode means that the regulator is | |
4623 | * simply passing the input directly to the output with no regulation. | |
4624 | */ | |
4625 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4626 | { | |
4627 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4628 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4629 | int ret = 0; |
4630 | ||
4631 | if (!rdev->desc->ops->set_bypass) | |
4632 | return 0; | |
4633 | ||
8a34e979 | 4634 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4635 | return 0; |
4636 | ||
66cf9a7e | 4637 | regulator_lock(rdev); |
f59c8f9f MB |
4638 | |
4639 | if (enable && !regulator->bypass) { | |
4640 | rdev->bypass_count++; | |
4641 | ||
4642 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4643 | trace_regulator_bypass_enable(name); |
4644 | ||
f59c8f9f MB |
4645 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4646 | if (ret != 0) | |
4647 | rdev->bypass_count--; | |
48325655 CK |
4648 | else |
4649 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4650 | } |
4651 | ||
4652 | } else if (!enable && regulator->bypass) { | |
4653 | rdev->bypass_count--; | |
4654 | ||
4655 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4656 | trace_regulator_bypass_disable(name); |
4657 | ||
f59c8f9f MB |
4658 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4659 | if (ret != 0) | |
4660 | rdev->bypass_count++; | |
48325655 CK |
4661 | else |
4662 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4663 | } |
4664 | } | |
4665 | ||
4666 | if (ret == 0) | |
4667 | regulator->bypass = enable; | |
4668 | ||
66cf9a7e | 4669 | regulator_unlock(rdev); |
f59c8f9f MB |
4670 | |
4671 | return ret; | |
4672 | } | |
4673 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4674 | ||
414c70cb LG |
4675 | /** |
4676 | * regulator_register_notifier - register regulator event notifier | |
4677 | * @regulator: regulator source | |
69279fb9 | 4678 | * @nb: notifier block |
414c70cb LG |
4679 | * |
4680 | * Register notifier block to receive regulator events. | |
4681 | */ | |
4682 | int regulator_register_notifier(struct regulator *regulator, | |
4683 | struct notifier_block *nb) | |
4684 | { | |
4685 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4686 | nb); | |
4687 | } | |
4688 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4689 | ||
4690 | /** | |
4691 | * regulator_unregister_notifier - unregister regulator event notifier | |
4692 | * @regulator: regulator source | |
69279fb9 | 4693 | * @nb: notifier block |
414c70cb LG |
4694 | * |
4695 | * Unregister regulator event notifier block. | |
4696 | */ | |
4697 | int regulator_unregister_notifier(struct regulator *regulator, | |
4698 | struct notifier_block *nb) | |
4699 | { | |
4700 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4701 | nb); | |
4702 | } | |
4703 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4704 | ||
b136fb44 JC |
4705 | /* notify regulator consumers and downstream regulator consumers. |
4706 | * Note mutex must be held by caller. | |
4707 | */ | |
7179569a | 4708 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4709 | unsigned long event, void *data) |
4710 | { | |
414c70cb | 4711 | /* call rdev chain first */ |
7179569a | 4712 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4713 | } |
4714 | ||
4715 | /** | |
4716 | * regulator_bulk_get - get multiple regulator consumers | |
4717 | * | |
4718 | * @dev: Device to supply | |
4719 | * @num_consumers: Number of consumers to register | |
4720 | * @consumers: Configuration of consumers; clients are stored here. | |
4721 | * | |
4722 | * @return 0 on success, an errno on failure. | |
4723 | * | |
4724 | * This helper function allows drivers to get several regulator | |
4725 | * consumers in one operation. If any of the regulators cannot be | |
4726 | * acquired then any regulators that were allocated will be freed | |
4727 | * before returning to the caller. | |
4728 | */ | |
4729 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4730 | struct regulator_bulk_data *consumers) | |
4731 | { | |
4732 | int i; | |
4733 | int ret; | |
4734 | ||
4735 | for (i = 0; i < num_consumers; i++) | |
4736 | consumers[i].consumer = NULL; | |
4737 | ||
4738 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4739 | consumers[i].consumer = regulator_get(dev, |
4740 | consumers[i].supply); | |
414c70cb | 4741 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb LG |
4742 | ret = PTR_ERR(consumers[i].consumer); |
4743 | consumers[i].consumer = NULL; | |
4744 | goto err; | |
4745 | } | |
4746 | } | |
4747 | ||
4748 | return 0; | |
4749 | ||
4750 | err: | |
b9816363 | 4751 | if (ret != -EPROBE_DEFER) |
61aab5ad MM |
4752 | dev_err(dev, "Failed to get supply '%s': %pe\n", |
4753 | consumers[i].supply, ERR_PTR(ret)); | |
b9816363 JRO |
4754 | else |
4755 | dev_dbg(dev, "Failed to get supply '%s', deferring\n", | |
4756 | consumers[i].supply); | |
4757 | ||
b29c7690 | 4758 | while (--i >= 0) |
414c70cb LG |
4759 | regulator_put(consumers[i].consumer); |
4760 | ||
4761 | return ret; | |
4762 | } | |
4763 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4764 | ||
f21e0e81 MB |
4765 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4766 | { | |
4767 | struct regulator_bulk_data *bulk = data; | |
4768 | ||
4769 | bulk->ret = regulator_enable(bulk->consumer); | |
4770 | } | |
4771 | ||
414c70cb LG |
4772 | /** |
4773 | * regulator_bulk_enable - enable multiple regulator consumers | |
4774 | * | |
4775 | * @num_consumers: Number of consumers | |
4776 | * @consumers: Consumer data; clients are stored here. | |
4777 | * @return 0 on success, an errno on failure | |
4778 | * | |
4779 | * This convenience API allows consumers to enable multiple regulator | |
4780 | * clients in a single API call. If any consumers cannot be enabled | |
4781 | * then any others that were enabled will be disabled again prior to | |
4782 | * return. | |
4783 | */ | |
4784 | int regulator_bulk_enable(int num_consumers, | |
4785 | struct regulator_bulk_data *consumers) | |
4786 | { | |
2955b47d | 4787 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4788 | int i; |
f21e0e81 | 4789 | int ret = 0; |
414c70cb | 4790 | |
6492bc1b | 4791 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4792 | async_schedule_domain(regulator_bulk_enable_async, |
4793 | &consumers[i], &async_domain); | |
6492bc1b | 4794 | } |
f21e0e81 MB |
4795 | |
4796 | async_synchronize_full_domain(&async_domain); | |
4797 | ||
4798 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4799 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4800 | if (consumers[i].ret != 0) { |
4801 | ret = consumers[i].ret; | |
414c70cb | 4802 | goto err; |
f21e0e81 | 4803 | } |
414c70cb LG |
4804 | } |
4805 | ||
4806 | return 0; | |
4807 | ||
4808 | err: | |
fbe31057 AH |
4809 | for (i = 0; i < num_consumers; i++) { |
4810 | if (consumers[i].ret < 0) | |
61aab5ad MM |
4811 | pr_err("Failed to enable %s: %pe\n", consumers[i].supply, |
4812 | ERR_PTR(consumers[i].ret)); | |
fbe31057 AH |
4813 | else |
4814 | regulator_disable(consumers[i].consumer); | |
4815 | } | |
414c70cb LG |
4816 | |
4817 | return ret; | |
4818 | } | |
4819 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4820 | ||
4821 | /** | |
4822 | * regulator_bulk_disable - disable multiple regulator consumers | |
4823 | * | |
4824 | * @num_consumers: Number of consumers | |
4825 | * @consumers: Consumer data; clients are stored here. | |
4826 | * @return 0 on success, an errno on failure | |
4827 | * | |
4828 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4829 | * clients in a single API call. If any consumers cannot be disabled |
4830 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4831 | * return. |
4832 | */ | |
4833 | int regulator_bulk_disable(int num_consumers, | |
4834 | struct regulator_bulk_data *consumers) | |
4835 | { | |
4836 | int i; | |
01e86f49 | 4837 | int ret, r; |
414c70cb | 4838 | |
49e22632 | 4839 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4840 | ret = regulator_disable(consumers[i].consumer); |
4841 | if (ret != 0) | |
4842 | goto err; | |
4843 | } | |
4844 | ||
4845 | return 0; | |
4846 | ||
4847 | err: | |
61aab5ad | 4848 | pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret)); |
01e86f49 MB |
4849 | for (++i; i < num_consumers; ++i) { |
4850 | r = regulator_enable(consumers[i].consumer); | |
4851 | if (r != 0) | |
61aab5ad MM |
4852 | pr_err("Failed to re-enable %s: %pe\n", |
4853 | consumers[i].supply, ERR_PTR(r)); | |
01e86f49 | 4854 | } |
414c70cb LG |
4855 | |
4856 | return ret; | |
4857 | } | |
4858 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4859 | ||
e1de2f42 DK |
4860 | /** |
4861 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4862 | * | |
4863 | * @num_consumers: Number of consumers | |
4864 | * @consumers: Consumer data; clients are stored here. | |
4865 | * @return 0 on success, an errno on failure | |
4866 | * | |
4867 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4868 | * clients in a single API call. | |
4869 | * NOTE: This should be used for situations when device damage will | |
4870 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4871 | * Although regulator_force_disable function call for some consumers can | |
4872 | * return error numbers, the function is called for all consumers. | |
4873 | */ | |
4874 | int regulator_bulk_force_disable(int num_consumers, | |
4875 | struct regulator_bulk_data *consumers) | |
4876 | { | |
4877 | int i; | |
b8c77ff6 | 4878 | int ret = 0; |
e1de2f42 | 4879 | |
b8c77ff6 | 4880 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4881 | consumers[i].ret = |
4882 | regulator_force_disable(consumers[i].consumer); | |
4883 | ||
b8c77ff6 DT |
4884 | /* Store first error for reporting */ |
4885 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4886 | ret = consumers[i].ret; |
e1de2f42 DK |
4887 | } |
4888 | ||
e1de2f42 DK |
4889 | return ret; |
4890 | } | |
4891 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4892 | ||
414c70cb LG |
4893 | /** |
4894 | * regulator_bulk_free - free multiple regulator consumers | |
4895 | * | |
4896 | * @num_consumers: Number of consumers | |
4897 | * @consumers: Consumer data; clients are stored here. | |
4898 | * | |
4899 | * This convenience API allows consumers to free multiple regulator | |
4900 | * clients in a single API call. | |
4901 | */ | |
4902 | void regulator_bulk_free(int num_consumers, | |
4903 | struct regulator_bulk_data *consumers) | |
4904 | { | |
4905 | int i; | |
4906 | ||
4907 | for (i = 0; i < num_consumers; i++) { | |
4908 | regulator_put(consumers[i].consumer); | |
4909 | consumers[i].consumer = NULL; | |
4910 | } | |
4911 | } | |
4912 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4913 | ||
4914 | /** | |
4915 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4916 | * @rdev: regulator source |
414c70cb | 4917 | * @event: notifier block |
69279fb9 | 4918 | * @data: callback-specific data. |
414c70cb LG |
4919 | * |
4920 | * Called by regulator drivers to notify clients a regulator event has | |
3bca239d | 4921 | * occurred. |
414c70cb LG |
4922 | */ |
4923 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4924 | unsigned long event, void *data) | |
4925 | { | |
4926 | _notifier_call_chain(rdev, event, data); | |
4927 | return NOTIFY_DONE; | |
4928 | ||
4929 | } | |
4930 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4931 | ||
be721979 MB |
4932 | /** |
4933 | * regulator_mode_to_status - convert a regulator mode into a status | |
4934 | * | |
4935 | * @mode: Mode to convert | |
4936 | * | |
4937 | * Convert a regulator mode into a status. | |
4938 | */ | |
4939 | int regulator_mode_to_status(unsigned int mode) | |
4940 | { | |
4941 | switch (mode) { | |
4942 | case REGULATOR_MODE_FAST: | |
4943 | return REGULATOR_STATUS_FAST; | |
4944 | case REGULATOR_MODE_NORMAL: | |
4945 | return REGULATOR_STATUS_NORMAL; | |
4946 | case REGULATOR_MODE_IDLE: | |
4947 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4948 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4949 | return REGULATOR_STATUS_STANDBY; |
4950 | default: | |
1beaf762 | 4951 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4952 | } |
4953 | } | |
4954 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4955 | ||
39f802d6 TI |
4956 | static struct attribute *regulator_dev_attrs[] = { |
4957 | &dev_attr_name.attr, | |
4958 | &dev_attr_num_users.attr, | |
4959 | &dev_attr_type.attr, | |
4960 | &dev_attr_microvolts.attr, | |
4961 | &dev_attr_microamps.attr, | |
4962 | &dev_attr_opmode.attr, | |
4963 | &dev_attr_state.attr, | |
4964 | &dev_attr_status.attr, | |
4965 | &dev_attr_bypass.attr, | |
4966 | &dev_attr_requested_microamps.attr, | |
4967 | &dev_attr_min_microvolts.attr, | |
4968 | &dev_attr_max_microvolts.attr, | |
4969 | &dev_attr_min_microamps.attr, | |
4970 | &dev_attr_max_microamps.attr, | |
4971 | &dev_attr_suspend_standby_state.attr, | |
4972 | &dev_attr_suspend_mem_state.attr, | |
4973 | &dev_attr_suspend_disk_state.attr, | |
4974 | &dev_attr_suspend_standby_microvolts.attr, | |
4975 | &dev_attr_suspend_mem_microvolts.attr, | |
4976 | &dev_attr_suspend_disk_microvolts.attr, | |
4977 | &dev_attr_suspend_standby_mode.attr, | |
4978 | &dev_attr_suspend_mem_mode.attr, | |
4979 | &dev_attr_suspend_disk_mode.attr, | |
4980 | NULL | |
4981 | }; | |
4982 | ||
7ad68e2f DB |
4983 | /* |
4984 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4985 | * create attributes that can be meaningfully displayed. | |
4986 | */ | |
39f802d6 TI |
4987 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4988 | struct attribute *attr, int idx) | |
7ad68e2f | 4989 | { |
39f802d6 | 4990 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4991 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4992 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4993 | umode_t mode = attr->mode; |
4994 | ||
4995 | /* these three are always present */ | |
4996 | if (attr == &dev_attr_name.attr || | |
4997 | attr == &dev_attr_num_users.attr || | |
4998 | attr == &dev_attr_type.attr) | |
4999 | return mode; | |
7ad68e2f DB |
5000 | |
5001 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
5002 | if (attr == &dev_attr_microvolts.attr) { |
5003 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
5004 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
5005 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
5006 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
5007 | return mode; | |
5008 | return 0; | |
f59c8f9f | 5009 | } |
7ad68e2f | 5010 | |
39f802d6 TI |
5011 | if (attr == &dev_attr_microamps.attr) |
5012 | return ops->get_current_limit ? mode : 0; | |
5013 | ||
5014 | if (attr == &dev_attr_opmode.attr) | |
5015 | return ops->get_mode ? mode : 0; | |
5016 | ||
5017 | if (attr == &dev_attr_state.attr) | |
5018 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
5019 | ||
5020 | if (attr == &dev_attr_status.attr) | |
5021 | return ops->get_status ? mode : 0; | |
5022 | ||
5023 | if (attr == &dev_attr_bypass.attr) | |
5024 | return ops->get_bypass ? mode : 0; | |
5025 | ||
7ad68e2f | 5026 | /* constraints need specific supporting methods */ |
39f802d6 TI |
5027 | if (attr == &dev_attr_min_microvolts.attr || |
5028 | attr == &dev_attr_max_microvolts.attr) | |
5029 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
5030 | ||
5031 | if (attr == &dev_attr_min_microamps.attr || | |
5032 | attr == &dev_attr_max_microamps.attr) | |
5033 | return ops->set_current_limit ? mode : 0; | |
5034 | ||
5035 | if (attr == &dev_attr_suspend_standby_state.attr || | |
5036 | attr == &dev_attr_suspend_mem_state.attr || | |
5037 | attr == &dev_attr_suspend_disk_state.attr) | |
5038 | return mode; | |
5039 | ||
5040 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
5041 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
5042 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
5043 | return ops->set_suspend_voltage ? mode : 0; | |
5044 | ||
5045 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
5046 | attr == &dev_attr_suspend_mem_mode.attr || | |
5047 | attr == &dev_attr_suspend_disk_mode.attr) | |
5048 | return ops->set_suspend_mode ? mode : 0; | |
5049 | ||
5050 | return mode; | |
5051 | } | |
5052 | ||
5053 | static const struct attribute_group regulator_dev_group = { | |
5054 | .attrs = regulator_dev_attrs, | |
5055 | .is_visible = regulator_attr_is_visible, | |
5056 | }; | |
5057 | ||
5058 | static const struct attribute_group *regulator_dev_groups[] = { | |
5059 | ®ulator_dev_group, | |
5060 | NULL | |
5061 | }; | |
7ad68e2f | 5062 | |
39f802d6 TI |
5063 | static void regulator_dev_release(struct device *dev) |
5064 | { | |
5065 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
5066 | |
5067 | kfree(rdev->constraints); | |
5068 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 5069 | kfree(rdev); |
7ad68e2f DB |
5070 | } |
5071 | ||
1130e5b3 MB |
5072 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
5073 | { | |
a9eaa813 GR |
5074 | struct device *parent = rdev->dev.parent; |
5075 | const char *rname = rdev_get_name(rdev); | |
5076 | char name[NAME_MAX]; | |
5077 | ||
5078 | /* Avoid duplicate debugfs directory names */ | |
5079 | if (parent && rname == rdev->desc->name) { | |
5080 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
5081 | rname); | |
5082 | rname = name; | |
5083 | } | |
5084 | ||
5085 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 5086 | if (!rdev->debugfs) { |
1130e5b3 | 5087 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
5088 | return; |
5089 | } | |
5090 | ||
5091 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
5092 | &rdev->use_count); | |
5093 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
5094 | &rdev->open_count); | |
f59c8f9f MB |
5095 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
5096 | &rdev->bypass_count); | |
1130e5b3 MB |
5097 | } |
5098 | ||
5e3ca2b3 JMC |
5099 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
5100 | { | |
7ddede6a JH |
5101 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5102 | ||
5103 | if (regulator_resolve_supply(rdev)) | |
5104 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
5105 | ||
5106 | return 0; | |
5e3ca2b3 JMC |
5107 | } |
5108 | ||
d8ca7d18 DO |
5109 | int regulator_coupler_register(struct regulator_coupler *coupler) |
5110 | { | |
5111 | mutex_lock(®ulator_list_mutex); | |
5112 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
5113 | mutex_unlock(®ulator_list_mutex); | |
5114 | ||
5115 | return 0; | |
5116 | } | |
5117 | ||
5118 | static struct regulator_coupler * | |
5119 | regulator_find_coupler(struct regulator_dev *rdev) | |
5120 | { | |
5121 | struct regulator_coupler *coupler; | |
5122 | int err; | |
5123 | ||
5124 | /* | |
5125 | * Note that regulators are appended to the list and the generic | |
5126 | * coupler is registered first, hence it will be attached at last | |
5127 | * if nobody cared. | |
5128 | */ | |
5129 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
5130 | err = coupler->attach_regulator(coupler, rdev); | |
5131 | if (!err) { | |
5132 | if (!coupler->balance_voltage && | |
5133 | rdev->coupling_desc.n_coupled > 2) | |
5134 | goto err_unsupported; | |
5135 | ||
5136 | return coupler; | |
5137 | } | |
5138 | ||
5139 | if (err < 0) | |
5140 | return ERR_PTR(err); | |
5141 | ||
5142 | if (err == 1) | |
5143 | continue; | |
5144 | ||
5145 | break; | |
5146 | } | |
5147 | ||
5148 | return ERR_PTR(-EINVAL); | |
5149 | ||
5150 | err_unsupported: | |
5151 | if (coupler->detach_regulator) | |
5152 | coupler->detach_regulator(coupler, rdev); | |
5153 | ||
5154 | rdev_err(rdev, | |
5155 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
5156 | ||
5157 | return ERR_PTR(-EPERM); | |
5158 | } | |
5159 | ||
f9503385 | 5160 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 5161 | { |
d8ca7d18 | 5162 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
5163 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
5164 | int n_coupled = c_desc->n_coupled; | |
5165 | struct regulator_dev *c_rdev; | |
5166 | int i; | |
5167 | ||
5168 | for (i = 1; i < n_coupled; i++) { | |
5169 | /* already resolved */ | |
5170 | if (c_desc->coupled_rdevs[i]) | |
5171 | continue; | |
5172 | ||
5173 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
5174 | ||
f9503385 DO |
5175 | if (!c_rdev) |
5176 | continue; | |
d3d64537 | 5177 | |
d8ca7d18 DO |
5178 | if (c_rdev->coupling_desc.coupler != coupler) { |
5179 | rdev_err(rdev, "coupler mismatch with %s\n", | |
5180 | rdev_get_name(c_rdev)); | |
5181 | return; | |
5182 | } | |
5183 | ||
f9503385 DO |
5184 | c_desc->coupled_rdevs[i] = c_rdev; |
5185 | c_desc->n_resolved++; | |
d3d64537 | 5186 | |
f9503385 DO |
5187 | regulator_resolve_coupling(c_rdev); |
5188 | } | |
d3d64537 MP |
5189 | } |
5190 | ||
6303f3e7 | 5191 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 5192 | { |
d8ca7d18 | 5193 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
5194 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
5195 | struct regulator_dev *__c_rdev, *c_rdev; | |
5196 | unsigned int __n_coupled, n_coupled; | |
5197 | int i, k; | |
d8ca7d18 | 5198 | int err; |
d3d64537 | 5199 | |
6303f3e7 | 5200 | n_coupled = c_desc->n_coupled; |
d3d64537 | 5201 | |
6303f3e7 DO |
5202 | for (i = 1; i < n_coupled; i++) { |
5203 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 5204 | |
6303f3e7 DO |
5205 | if (!c_rdev) |
5206 | continue; | |
5207 | ||
5208 | regulator_lock(c_rdev); | |
5209 | ||
5210 | __c_desc = &c_rdev->coupling_desc; | |
5211 | __n_coupled = __c_desc->n_coupled; | |
5212 | ||
5213 | for (k = 1; k < __n_coupled; k++) { | |
5214 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
5215 | ||
5216 | if (__c_rdev == rdev) { | |
5217 | __c_desc->coupled_rdevs[k] = NULL; | |
5218 | __c_desc->n_resolved--; | |
5219 | break; | |
5220 | } | |
5221 | } | |
5222 | ||
5223 | regulator_unlock(c_rdev); | |
5224 | ||
5225 | c_desc->coupled_rdevs[i] = NULL; | |
5226 | c_desc->n_resolved--; | |
5227 | } | |
d8ca7d18 DO |
5228 | |
5229 | if (coupler && coupler->detach_regulator) { | |
5230 | err = coupler->detach_regulator(coupler, rdev); | |
5231 | if (err) | |
61aab5ad MM |
5232 | rdev_err(rdev, "failed to detach from coupler: %pe\n", |
5233 | ERR_PTR(err)); | |
d8ca7d18 DO |
5234 | } |
5235 | ||
5236 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5237 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5238 | } |
5239 | ||
f9503385 | 5240 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5241 | { |
7d819664 | 5242 | struct regulator_dev **coupled; |
d8ca7d18 | 5243 | int err, n_phandles; |
d3d64537 MP |
5244 | |
5245 | if (!IS_ENABLED(CONFIG_OF)) | |
5246 | n_phandles = 0; | |
5247 | else | |
5248 | n_phandles = of_get_n_coupled(rdev); | |
5249 | ||
7d819664 MM |
5250 | coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL); |
5251 | if (!coupled) | |
d8ca7d18 | 5252 | return -ENOMEM; |
d3d64537 | 5253 | |
7d819664 MM |
5254 | rdev->coupling_desc.coupled_rdevs = coupled; |
5255 | ||
d3d64537 MP |
5256 | /* |
5257 | * Every regulator should always have coupling descriptor filled with | |
5258 | * at least pointer to itself. | |
5259 | */ | |
5260 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5261 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5262 | rdev->coupling_desc.n_resolved++; | |
5263 | ||
5264 | /* regulator isn't coupled */ | |
5265 | if (n_phandles == 0) | |
5266 | return 0; | |
5267 | ||
d8ca7d18 | 5268 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5269 | return -EPERM; |
d3d64537 | 5270 | |
73a32129 | 5271 | mutex_lock(®ulator_list_mutex); |
d8ca7d18 | 5272 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
73a32129 MM |
5273 | mutex_unlock(®ulator_list_mutex); |
5274 | ||
d8ca7d18 DO |
5275 | if (IS_ERR(rdev->coupling_desc.coupler)) { |
5276 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
61aab5ad | 5277 | rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err)); |
d8ca7d18 | 5278 | return err; |
d3d64537 MP |
5279 | } |
5280 | ||
d8ca7d18 DO |
5281 | return 0; |
5282 | } | |
5283 | ||
5284 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5285 | struct regulator_dev *rdev) | |
5286 | { | |
5287 | if (rdev->coupling_desc.n_coupled > 2) { | |
5288 | rdev_err(rdev, | |
5289 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5290 | return -EPERM; |
d8ca7d18 | 5291 | } |
d3d64537 | 5292 | |
e381bfe4 DO |
5293 | if (!rdev->constraints->always_on) { |
5294 | rdev_err(rdev, | |
5295 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5296 | return -ENOTSUPP; | |
5297 | } | |
5298 | ||
d3d64537 MP |
5299 | return 0; |
5300 | } | |
5301 | ||
d8ca7d18 DO |
5302 | static struct regulator_coupler generic_regulator_coupler = { |
5303 | .attach_regulator = generic_coupler_attach, | |
5304 | }; | |
5305 | ||
414c70cb LG |
5306 | /** |
5307 | * regulator_register - register regulator | |
69279fb9 | 5308 | * @regulator_desc: regulator to register |
f47531b1 | 5309 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5310 | * |
5311 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5312 | * Returns a valid pointer to struct regulator_dev on success |
5313 | * or an ERR_PTR() on error. | |
414c70cb | 5314 | */ |
65f26846 MB |
5315 | struct regulator_dev * |
5316 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 5317 | const struct regulator_config *cfg) |
414c70cb | 5318 | { |
c172708d | 5319 | const struct regulator_init_data *init_data; |
1b3de223 | 5320 | struct regulator_config *config = NULL; |
72dca06f | 5321 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5322 | struct regulator_dev *rdev; |
0edb040d LW |
5323 | bool dangling_cfg_gpiod = false; |
5324 | bool dangling_of_gpiod = false; | |
32c8fad4 | 5325 | struct device *dev; |
a5766f11 | 5326 | int ret, i; |
414c70cb | 5327 | |
0edb040d | 5328 | if (cfg == NULL) |
414c70cb | 5329 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5330 | if (cfg->ena_gpiod) |
5331 | dangling_cfg_gpiod = true; | |
5332 | if (regulator_desc == NULL) { | |
5333 | ret = -EINVAL; | |
5334 | goto rinse; | |
5335 | } | |
414c70cb | 5336 | |
1b3de223 | 5337 | dev = cfg->dev; |
dcf70112 | 5338 | WARN_ON(!dev); |
32c8fad4 | 5339 | |
0edb040d LW |
5340 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5341 | ret = -EINVAL; | |
5342 | goto rinse; | |
5343 | } | |
414c70cb | 5344 | |
cd78dfc6 | 5345 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5346 | regulator_desc->type != REGULATOR_CURRENT) { |
5347 | ret = -EINVAL; | |
5348 | goto rinse; | |
5349 | } | |
414c70cb | 5350 | |
476c2d83 MB |
5351 | /* Only one of each should be implemented */ |
5352 | WARN_ON(regulator_desc->ops->get_voltage && | |
5353 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5354 | WARN_ON(regulator_desc->ops->set_voltage && |
5355 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5356 | |
5357 | /* If we're using selectors we must implement list_voltage. */ | |
5358 | if (regulator_desc->ops->get_voltage_sel && | |
5359 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5360 | ret = -EINVAL; |
5361 | goto rinse; | |
476c2d83 | 5362 | } |
e8eef82b MB |
5363 | if (regulator_desc->ops->set_voltage_sel && |
5364 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5365 | ret = -EINVAL; |
5366 | goto rinse; | |
e8eef82b | 5367 | } |
476c2d83 | 5368 | |
414c70cb | 5369 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5370 | if (rdev == NULL) { |
5371 | ret = -ENOMEM; | |
5372 | goto rinse; | |
5373 | } | |
d3c73156 | 5374 | device_initialize(&rdev->dev); |
7111c6d1 | 5375 | spin_lock_init(&rdev->err_lock); |
414c70cb | 5376 | |
1b3de223 KK |
5377 | /* |
5378 | * Duplicate the config so the driver could override it after | |
5379 | * parsing init data. | |
5380 | */ | |
5381 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5382 | if (config == NULL) { | |
0edb040d | 5383 | ret = -ENOMEM; |
d3c73156 | 5384 | goto clean; |
1b3de223 KK |
5385 | } |
5386 | ||
bfa21a0d | 5387 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5388 | &rdev->dev.of_node); |
f8970d34 MF |
5389 | |
5390 | /* | |
5391 | * Sometimes not all resources are probed already so we need to take | |
5392 | * that into account. This happens most the time if the ena_gpiod comes | |
5393 | * from a gpio extender or something else. | |
5394 | */ | |
5395 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
f8970d34 | 5396 | ret = -EPROBE_DEFER; |
d3c73156 | 5397 | goto clean; |
f8970d34 MF |
5398 | } |
5399 | ||
0edb040d LW |
5400 | /* |
5401 | * We need to keep track of any GPIO descriptor coming from the | |
5402 | * device tree until we have handled it over to the core. If the | |
5403 | * config that was passed in to this function DOES NOT contain | |
5404 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5405 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5406 | * tree. |
5407 | */ | |
5408 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5409 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5410 | if (!init_data) { |
5411 | init_data = config->init_data; | |
5412 | rdev->dev.of_node = of_node_get(config->of_node); | |
5413 | } | |
5414 | ||
f8702f9e | 5415 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5416 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5417 | rdev->owner = regulator_desc->owner; |
5418 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5419 | if (config->regmap) |
5420 | rdev->regmap = config->regmap; | |
52b84dac | 5421 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5422 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5423 | else if (dev->parent) |
5424 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5425 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5426 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5427 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5428 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5429 | |
a5766f11 | 5430 | /* preform any regulator specific init */ |
9a8f5e07 | 5431 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5432 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
5433 | if (ret < 0) |
5434 | goto clean; | |
a5766f11 LG |
5435 | } |
5436 | ||
541d052d | 5437 | if (config->ena_gpiod) { |
daad134d KA |
5438 | ret = regulator_ena_gpio_request(rdev, config); |
5439 | if (ret != 0) { | |
61aab5ad MM |
5440 | rdev_err(rdev, "Failed to request enable GPIO: %pe\n", |
5441 | ERR_PTR(ret)); | |
32165230 | 5442 | goto clean; |
daad134d | 5443 | } |
0edb040d LW |
5444 | /* The regulator core took over the GPIO descriptor */ |
5445 | dangling_cfg_gpiod = false; | |
5446 | dangling_of_gpiod = false; | |
daad134d KA |
5447 | } |
5448 | ||
a5766f11 | 5449 | /* register with sysfs */ |
414c70cb | 5450 | rdev->dev.class = ®ulator_class; |
a5766f11 | 5451 | rdev->dev.parent = dev; |
72dca06f | 5452 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5453 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5454 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5455 | |
74f544c1 | 5456 | /* set regulator constraints */ |
9a8f5e07 | 5457 | if (init_data) |
57a6ad48 MM |
5458 | rdev->constraints = kmemdup(&init_data->constraints, |
5459 | sizeof(*rdev->constraints), | |
5460 | GFP_KERNEL); | |
5461 | else | |
5462 | rdev->constraints = kzalloc(sizeof(*rdev->constraints), | |
5463 | GFP_KERNEL); | |
5464 | if (!rdev->constraints) { | |
5465 | ret = -ENOMEM; | |
5466 | goto wash; | |
5467 | } | |
9a8f5e07 | 5468 | |
9a8f5e07 | 5469 | if (init_data && init_data->supply_regulator) |
6261b06d | 5470 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 5471 | else if (regulator_desc->supply_name) |
6261b06d | 5472 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 5473 | |
57a6ad48 | 5474 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5475 | if (ret == -EPROBE_DEFER) { |
5476 | /* Regulator might be in bypass mode and so needs its supply | |
69b8821e SK |
5477 | * to set the constraints |
5478 | */ | |
aea6cb99 MM |
5479 | /* FIXME: this currently triggers a chicken-and-egg problem |
5480 | * when creating -SUPPLY symlink in sysfs to a regulator | |
69b8821e SK |
5481 | * that is just being created |
5482 | */ | |
0917c9db MM |
5483 | rdev_dbg(rdev, "will resolve supply early: %s\n", |
5484 | rdev->supply_name); | |
aea6cb99 MM |
5485 | ret = regulator_resolve_supply(rdev); |
5486 | if (!ret) | |
57a6ad48 | 5487 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5488 | else |
5489 | rdev_dbg(rdev, "unable to resolve supply early: %pe\n", | |
5490 | ERR_PTR(ret)); | |
5491 | } | |
45389c47 JH |
5492 | if (ret < 0) |
5493 | goto wash; | |
5494 | ||
f9503385 DO |
5495 | ret = regulator_init_coupling(rdev); |
5496 | if (ret < 0) | |
d3d64537 MP |
5497 | goto wash; |
5498 | ||
a5766f11 | 5499 | /* add consumers devices */ |
9a8f5e07 MB |
5500 | if (init_data) { |
5501 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
5502 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5503 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5504 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
5505 | if (ret < 0) { |
5506 | dev_err(dev, "Failed to set supply %s\n", | |
5507 | init_data->consumer_supplies[i].supply); | |
5508 | goto unset_supplies; | |
5509 | } | |
23c2f041 | 5510 | } |
414c70cb | 5511 | } |
a5766f11 | 5512 | |
fd086045 MK |
5513 | if (!rdev->desc->ops->get_voltage && |
5514 | !rdev->desc->ops->list_voltage && | |
5515 | !rdev->desc->fixed_uV) | |
5516 | rdev->is_switch = true; | |
5517 | ||
9177514c VZ |
5518 | ret = device_add(&rdev->dev); |
5519 | if (ret != 0) | |
c438b9d0 | 5520 | goto unset_supplies; |
c438b9d0 | 5521 | |
1130e5b3 | 5522 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5523 | |
f9503385 DO |
5524 | /* try to resolve regulators coupling since a new one was registered */ |
5525 | mutex_lock(®ulator_list_mutex); | |
5526 | regulator_resolve_coupling(rdev); | |
5527 | mutex_unlock(®ulator_list_mutex); | |
5528 | ||
5e3ca2b3 JMC |
5529 | /* try to resolve regulators supply since a new one was registered */ |
5530 | class_for_each_device(®ulator_class, NULL, NULL, | |
5531 | regulator_register_resolve_supply); | |
1b3de223 | 5532 | kfree(config); |
414c70cb | 5533 | return rdev; |
4fca9545 | 5534 | |
d4033b54 | 5535 | unset_supplies: |
45389c47 | 5536 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5537 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5538 | regulator_remove_coupling(rdev); |
45389c47 | 5539 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5540 | wash: |
26c2c997 | 5541 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5542 | mutex_lock(®ulator_list_mutex); |
32165230 | 5543 | regulator_ena_gpio_free(rdev); |
45389c47 | 5544 | mutex_unlock(®ulator_list_mutex); |
4fca9545 | 5545 | clean: |
0edb040d LW |
5546 | if (dangling_of_gpiod) |
5547 | gpiod_put(config->ena_gpiod); | |
a2151374 | 5548 | kfree(config); |
d3c73156 | 5549 | put_device(&rdev->dev); |
0edb040d LW |
5550 | rinse: |
5551 | if (dangling_cfg_gpiod) | |
5552 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5553 | return ERR_PTR(ret); |
414c70cb LG |
5554 | } |
5555 | EXPORT_SYMBOL_GPL(regulator_register); | |
5556 | ||
5557 | /** | |
5558 | * regulator_unregister - unregister regulator | |
69279fb9 | 5559 | * @rdev: regulator to unregister |
414c70cb LG |
5560 | * |
5561 | * Called by regulator drivers to unregister a regulator. | |
5562 | */ | |
5563 | void regulator_unregister(struct regulator_dev *rdev) | |
5564 | { | |
5565 | if (rdev == NULL) | |
5566 | return; | |
5567 | ||
891636ea MB |
5568 | if (rdev->supply) { |
5569 | while (rdev->use_count--) | |
5570 | regulator_disable(rdev->supply); | |
e032b376 | 5571 | regulator_put(rdev->supply); |
891636ea | 5572 | } |
ff9b34b6 | 5573 | |
06377301 CK |
5574 | flush_work(&rdev->disable_work.work); |
5575 | ||
414c70cb | 5576 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5577 | |
1130e5b3 | 5578 | debugfs_remove_recursive(rdev->debugfs); |
6bf87d17 | 5579 | WARN_ON(rdev->open_count); |
6303f3e7 | 5580 | regulator_remove_coupling(rdev); |
0f1d747b | 5581 | unset_regulator_supplies(rdev); |
414c70cb | 5582 | list_del(&rdev->list); |
f19b00da | 5583 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5584 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5585 | |
5586 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5587 | } |
5588 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5589 | ||
f7efad10 | 5590 | #ifdef CONFIG_SUSPEND |
414c70cb | 5591 | /** |
0380cf7d | 5592 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5593 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5594 | * |
5595 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5596 | */ |
0380cf7d | 5597 | static int regulator_suspend(struct device *dev) |
414c70cb | 5598 | { |
cd7e36ab | 5599 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5600 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab | 5601 | int ret; |
0955f5be SB |
5602 | const struct regulator_state *rstate; |
5603 | ||
5604 | rstate = regulator_get_suspend_state_check(rdev, state); | |
5605 | if (!rstate) | |
5606 | return 0; | |
cd7e36ab MS |
5607 | |
5608 | regulator_lock(rdev); | |
0955f5be | 5609 | ret = __suspend_set_state(rdev, rstate); |
cd7e36ab | 5610 | regulator_unlock(rdev); |
414c70cb | 5611 | |
cd7e36ab | 5612 | return ret; |
85f3b431 | 5613 | } |
d3e4eccb | 5614 | |
cd7e36ab | 5615 | static int regulator_resume(struct device *dev) |
85f3b431 | 5616 | { |
cd7e36ab | 5617 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5618 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5619 | struct regulator_state *rstate; |
cd7e36ab | 5620 | int ret = 0; |
f7efad10 | 5621 | |
cd7e36ab | 5622 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5623 | if (rstate == NULL) |
35b5f14e | 5624 | return 0; |
414c70cb | 5625 | |
0955f5be SB |
5626 | /* Avoid grabbing the lock if we don't need to */ |
5627 | if (!rdev->desc->ops->resume) | |
5628 | return 0; | |
5629 | ||
66cf9a7e | 5630 | regulator_lock(rdev); |
85f3b431 | 5631 | |
0955f5be SB |
5632 | if (rstate->enabled == ENABLE_IN_SUSPEND || |
5633 | rstate->enabled == DISABLE_IN_SUSPEND) | |
0380cf7d | 5634 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5635 | |
66cf9a7e | 5636 | regulator_unlock(rdev); |
85f3b431 | 5637 | |
f7efad10 | 5638 | return ret; |
414c70cb | 5639 | } |
f7efad10 CZ |
5640 | #else /* !CONFIG_SUSPEND */ |
5641 | ||
0380cf7d | 5642 | #define regulator_suspend NULL |
5643 | #define regulator_resume NULL | |
f7efad10 CZ |
5644 | |
5645 | #endif /* !CONFIG_SUSPEND */ | |
5646 | ||
5647 | #ifdef CONFIG_PM | |
5648 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5649 | .suspend = regulator_suspend, |
5650 | .resume = regulator_resume, | |
f7efad10 CZ |
5651 | }; |
5652 | #endif | |
5653 | ||
285c22de | 5654 | struct class regulator_class = { |
f7efad10 CZ |
5655 | .name = "regulator", |
5656 | .dev_release = regulator_dev_release, | |
5657 | .dev_groups = regulator_dev_groups, | |
5658 | #ifdef CONFIG_PM | |
5659 | .pm = ®ulator_pm_ops, | |
5660 | #endif | |
5661 | }; | |
ca725561 MB |
5662 | /** |
5663 | * regulator_has_full_constraints - the system has fully specified constraints | |
5664 | * | |
5665 | * Calling this function will cause the regulator API to disable all | |
5666 | * regulators which have a zero use count and don't have an always_on | |
5667 | * constraint in a late_initcall. | |
5668 | * | |
5669 | * The intention is that this will become the default behaviour in a | |
5670 | * future kernel release so users are encouraged to use this facility | |
5671 | * now. | |
5672 | */ | |
5673 | void regulator_has_full_constraints(void) | |
5674 | { | |
5675 | has_full_constraints = 1; | |
5676 | } | |
5677 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5678 | ||
414c70cb LG |
5679 | /** |
5680 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5681 | * @rdev: regulator |
414c70cb LG |
5682 | * |
5683 | * Get rdev regulator driver private data. This call can be used in the | |
5684 | * regulator driver context. | |
5685 | */ | |
5686 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5687 | { | |
5688 | return rdev->reg_data; | |
5689 | } | |
5690 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5691 | ||
5692 | /** | |
5693 | * regulator_get_drvdata - get regulator driver data | |
5694 | * @regulator: regulator | |
5695 | * | |
5696 | * Get regulator driver private data. This call can be used in the consumer | |
5697 | * driver context when non API regulator specific functions need to be called. | |
5698 | */ | |
5699 | void *regulator_get_drvdata(struct regulator *regulator) | |
5700 | { | |
5701 | return regulator->rdev->reg_data; | |
5702 | } | |
5703 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5704 | ||
5705 | /** | |
5706 | * regulator_set_drvdata - set regulator driver data | |
5707 | * @regulator: regulator | |
5708 | * @data: data | |
5709 | */ | |
5710 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5711 | { | |
5712 | regulator->rdev->reg_data = data; | |
5713 | } | |
5714 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5715 | ||
5716 | /** | |
d73e873b | 5717 | * rdev_get_id - get regulator ID |
69279fb9 | 5718 | * @rdev: regulator |
414c70cb LG |
5719 | */ |
5720 | int rdev_get_id(struct regulator_dev *rdev) | |
5721 | { | |
5722 | return rdev->desc->id; | |
5723 | } | |
5724 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5725 | ||
a5766f11 LG |
5726 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5727 | { | |
5728 | return &rdev->dev; | |
5729 | } | |
5730 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5731 | ||
03c87b95 BG |
5732 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5733 | { | |
5734 | return rdev->regmap; | |
5735 | } | |
5736 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5737 | ||
a5766f11 LG |
5738 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5739 | { | |
5740 | return reg_init_data->driver_data; | |
5741 | } | |
5742 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5743 | ||
ba55a974 | 5744 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5745 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5746 | { |
ba55a974 MB |
5747 | struct regulator_map *map; |
5748 | ||
ba55a974 | 5749 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5750 | seq_printf(sf, "%s -> %s.%s\n", |
5751 | rdev_get_name(map->regulator), map->dev_name, | |
5752 | map->supply); | |
ba55a974 MB |
5753 | } |
5754 | ||
dbc55955 HZ |
5755 | return 0; |
5756 | } | |
3e60b4fc | 5757 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5758 | |
85f3b431 TV |
5759 | struct summary_data { |
5760 | struct seq_file *s; | |
5761 | struct regulator_dev *parent; | |
5762 | int level; | |
5763 | }; | |
5764 | ||
5765 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5766 | struct regulator_dev *rdev, | |
5767 | int level); | |
5768 | ||
5769 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5770 | { | |
5771 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5772 | struct summary_data *summary_data = data; | |
5773 | ||
5774 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5775 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5776 | summary_data->level + 1); | |
5777 | ||
5778 | return 0; | |
5779 | } | |
5780 | ||
7c225ec9 HS |
5781 | static void regulator_summary_show_subtree(struct seq_file *s, |
5782 | struct regulator_dev *rdev, | |
5783 | int level) | |
5784 | { | |
7c225ec9 HS |
5785 | struct regulation_constraints *c; |
5786 | struct regulator *consumer; | |
85f3b431 | 5787 | struct summary_data summary_data; |
7e4d9683 | 5788 | unsigned int opmode; |
7c225ec9 HS |
5789 | |
5790 | if (!rdev) | |
5791 | return; | |
5792 | ||
7e4d9683 | 5793 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5794 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5795 | level * 3 + 1, "", |
5796 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5797 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5798 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5799 | |
d22b85a1 | 5800 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5801 | seq_printf(s, "%5dmA ", |
5802 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5803 | |
5804 | c = rdev->constraints; | |
5805 | if (c) { | |
5806 | switch (rdev->desc->type) { | |
5807 | case REGULATOR_VOLTAGE: | |
5808 | seq_printf(s, "%5dmV %5dmV ", | |
5809 | c->min_uV / 1000, c->max_uV / 1000); | |
5810 | break; | |
5811 | case REGULATOR_CURRENT: | |
5812 | seq_printf(s, "%5dmA %5dmA ", | |
5813 | c->min_uA / 1000, c->max_uA / 1000); | |
5814 | break; | |
5815 | } | |
5816 | } | |
5817 | ||
5818 | seq_puts(s, "\n"); | |
5819 | ||
5820 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5821 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5822 | continue; |
5823 | ||
5824 | seq_printf(s, "%*s%-*s ", | |
5825 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5826 | 30 - (level + 1) * 3, |
6b576eb0 | 5827 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5828 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5829 | |
5830 | switch (rdev->desc->type) { | |
5831 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5832 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5833 | consumer->enable_count, | |
7d3827b5 | 5834 | consumer->uA_load / 1000, |
5451781d DA |
5835 | consumer->uA_load && !consumer->enable_count ? |
5836 | '*' : ' ', | |
c360a6df CZ |
5837 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5838 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5839 | break; |
5840 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5841 | break; |
5842 | } | |
5843 | ||
5844 | seq_puts(s, "\n"); | |
5845 | } | |
5846 | ||
85f3b431 TV |
5847 | summary_data.s = s; |
5848 | summary_data.level = level; | |
5849 | summary_data.parent = rdev; | |
7c225ec9 | 5850 | |
85f3b431 TV |
5851 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5852 | regulator_summary_show_children); | |
f8702f9e DO |
5853 | } |
5854 | ||
5855 | struct summary_lock_data { | |
5856 | struct ww_acquire_ctx *ww_ctx; | |
5857 | struct regulator_dev **new_contended_rdev; | |
5858 | struct regulator_dev **old_contended_rdev; | |
5859 | }; | |
5860 | ||
5861 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5862 | { | |
5863 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5864 | struct summary_lock_data *lock_data = data; | |
5865 | int ret = 0; | |
5866 | ||
5867 | if (rdev != *lock_data->old_contended_rdev) { | |
5868 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5869 | ||
5870 | if (ret == -EDEADLK) | |
5871 | *lock_data->new_contended_rdev = rdev; | |
5872 | else | |
5873 | WARN_ON_ONCE(ret); | |
5874 | } else { | |
5875 | *lock_data->old_contended_rdev = NULL; | |
5876 | } | |
5877 | ||
5878 | return ret; | |
5879 | } | |
5880 | ||
5881 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5882 | { | |
5883 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5884 | struct summary_lock_data *lock_data = data; | |
5885 | ||
5886 | if (lock_data) { | |
5887 | if (rdev == *lock_data->new_contended_rdev) | |
5888 | return -EDEADLK; | |
5889 | } | |
7e4d9683 DA |
5890 | |
5891 | regulator_unlock(rdev); | |
f8702f9e DO |
5892 | |
5893 | return 0; | |
5894 | } | |
5895 | ||
5896 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5897 | struct regulator_dev **new_contended_rdev, | |
5898 | struct regulator_dev **old_contended_rdev) | |
5899 | { | |
5900 | struct summary_lock_data lock_data; | |
5901 | int ret; | |
5902 | ||
5903 | lock_data.ww_ctx = ww_ctx; | |
5904 | lock_data.new_contended_rdev = new_contended_rdev; | |
5905 | lock_data.old_contended_rdev = old_contended_rdev; | |
5906 | ||
5907 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5908 | regulator_summary_lock_one); | |
5909 | if (ret) | |
5910 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5911 | regulator_summary_unlock_one); | |
5912 | ||
5913 | return ret; | |
5914 | } | |
5915 | ||
5916 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5917 | { | |
5918 | struct regulator_dev *new_contended_rdev = NULL; | |
5919 | struct regulator_dev *old_contended_rdev = NULL; | |
5920 | int err; | |
5921 | ||
ff9b34b6 DO |
5922 | mutex_lock(®ulator_list_mutex); |
5923 | ||
f8702f9e DO |
5924 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5925 | ||
5926 | do { | |
5927 | if (new_contended_rdev) { | |
5928 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5929 | old_contended_rdev = new_contended_rdev; | |
5930 | old_contended_rdev->ref_cnt++; | |
5931 | } | |
5932 | ||
5933 | err = regulator_summary_lock_all(ww_ctx, | |
5934 | &new_contended_rdev, | |
5935 | &old_contended_rdev); | |
5936 | ||
5937 | if (old_contended_rdev) | |
5938 | regulator_unlock(old_contended_rdev); | |
5939 | ||
5940 | } while (err == -EDEADLK); | |
5941 | ||
5942 | ww_acquire_done(ww_ctx); | |
5943 | } | |
5944 | ||
5945 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5946 | { | |
5947 | class_for_each_device(®ulator_class, NULL, NULL, | |
5948 | regulator_summary_unlock_one); | |
5949 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5950 | |
5951 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5952 | } |
5953 | ||
85f3b431 | 5954 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5955 | { |
85f3b431 TV |
5956 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5957 | struct seq_file *s = data; | |
7c225ec9 | 5958 | |
85f3b431 TV |
5959 | if (!rdev->supply) |
5960 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5961 | |
85f3b431 TV |
5962 | return 0; |
5963 | } | |
7c225ec9 | 5964 | |
85f3b431 TV |
5965 | static int regulator_summary_show(struct seq_file *s, void *data) |
5966 | { | |
f8702f9e DO |
5967 | struct ww_acquire_ctx ww_ctx; |
5968 | ||
01de19d0 DA |
5969 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5970 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5971 | |
f8702f9e DO |
5972 | regulator_summary_lock(&ww_ctx); |
5973 | ||
85f3b431 TV |
5974 | class_for_each_device(®ulator_class, NULL, s, |
5975 | regulator_summary_show_roots); | |
7c225ec9 | 5976 | |
f8702f9e DO |
5977 | regulator_summary_unlock(&ww_ctx); |
5978 | ||
7c225ec9 HS |
5979 | return 0; |
5980 | } | |
3e60b4fc YL |
5981 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5982 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5983 | |
414c70cb LG |
5984 | static int __init regulator_init(void) |
5985 | { | |
34abbd68 MB |
5986 | int ret; |
5987 | ||
34abbd68 MB |
5988 | ret = class_register(®ulator_class); |
5989 | ||
1130e5b3 | 5990 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5991 | if (!debugfs_root) |
1130e5b3 | 5992 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5993 | |
3e60b4fc | 5994 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5995 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5996 | &supply_map_fops); | |
1130e5b3 | 5997 | |
7c225ec9 | 5998 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5999 | NULL, ®ulator_summary_fops); |
3e60b4fc | 6000 | #endif |
34abbd68 MB |
6001 | regulator_dummy_init(); |
6002 | ||
d8ca7d18 DO |
6003 | regulator_coupler_register(&generic_regulator_coupler); |
6004 | ||
34abbd68 | 6005 | return ret; |
414c70cb LG |
6006 | } |
6007 | ||
6008 | /* init early to allow our consumers to complete system booting */ | |
6009 | core_initcall(regulator_init); | |
ca725561 | 6010 | |
55576cf1 | 6011 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 6012 | { |
609ca5f3 MB |
6013 | struct regulator_dev *rdev = dev_to_rdev(dev); |
6014 | const struct regulator_ops *ops = rdev->desc->ops; | |
6015 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 6016 | int enabled, ret; |
ca725561 | 6017 | |
609ca5f3 MB |
6018 | if (c && c->always_on) |
6019 | return 0; | |
6020 | ||
8a34e979 | 6021 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
6022 | return 0; |
6023 | ||
66cf9a7e | 6024 | regulator_lock(rdev); |
609ca5f3 MB |
6025 | |
6026 | if (rdev->use_count) | |
6027 | goto unlock; | |
6028 | ||
c088a498 | 6029 | /* If we can't read the status assume it's always on. */ |
609ca5f3 MB |
6030 | if (ops->is_enabled) |
6031 | enabled = ops->is_enabled(rdev); | |
6032 | else | |
6033 | enabled = 1; | |
6034 | ||
c088a498 PHS |
6035 | /* But if reading the status failed, assume that it's off. */ |
6036 | if (enabled <= 0) | |
609ca5f3 MB |
6037 | goto unlock; |
6038 | ||
6039 | if (have_full_constraints()) { | |
6040 | /* We log since this may kill the system if it goes | |
69b8821e SK |
6041 | * wrong. |
6042 | */ | |
609ca5f3 MB |
6043 | rdev_info(rdev, "disabling\n"); |
6044 | ret = _regulator_do_disable(rdev); | |
6045 | if (ret != 0) | |
61aab5ad | 6046 | rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret)); |
609ca5f3 MB |
6047 | } else { |
6048 | /* The intention is that in future we will | |
6049 | * assume that full constraints are provided | |
6050 | * so warn even if we aren't going to do | |
6051 | * anything here. | |
6052 | */ | |
6053 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
6054 | } | |
6055 | ||
6056 | unlock: | |
66cf9a7e | 6057 | regulator_unlock(rdev); |
609ca5f3 MB |
6058 | |
6059 | return 0; | |
6060 | } | |
6061 | ||
55576cf1 | 6062 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 6063 | { |
3827b64d JMC |
6064 | /* |
6065 | * Regulators may had failed to resolve their input supplies | |
6066 | * when were registered, either because the input supply was | |
6067 | * not registered yet or because its parent device was not | |
6068 | * bound yet. So attempt to resolve the input supplies for | |
6069 | * pending regulators before trying to disable unused ones. | |
6070 | */ | |
6071 | class_for_each_device(®ulator_class, NULL, NULL, | |
6072 | regulator_register_resolve_supply); | |
6073 | ||
ca725561 | 6074 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
6075 | * we have permission to change the status for and which are |
6076 | * not in use or always_on. This is effectively the default | |
6077 | * for DT and ACPI as they have full constraints. | |
ca725561 | 6078 | */ |
609ca5f3 MB |
6079 | class_for_each_device(®ulator_class, NULL, NULL, |
6080 | regulator_late_cleanup); | |
55576cf1 MB |
6081 | } |
6082 | ||
6083 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
6084 | regulator_init_complete_work_function); | |
6085 | ||
6086 | static int __init regulator_init_complete(void) | |
6087 | { | |
6088 | /* | |
6089 | * Since DT doesn't provide an idiomatic mechanism for | |
6090 | * enabling full constraints and since it's much more natural | |
6091 | * with DT to provide them just assume that a DT enabled | |
6092 | * system has full constraints. | |
6093 | */ | |
6094 | if (of_have_populated_dt()) | |
6095 | has_full_constraints = true; | |
6096 | ||
6097 | /* | |
2a15483b JS |
6098 | * We punt completion for an arbitrary amount of time since |
6099 | * systems like distros will load many drivers from userspace | |
6100 | * so consumers might not always be ready yet, this is | |
6101 | * particularly an issue with laptops where this might bounce | |
6102 | * the display off then on. Ideally we'd get a notification | |
6103 | * from userspace when this happens but we don't so just wait | |
6104 | * a bit and hope we waited long enough. It'd be better if | |
6105 | * we'd only do this on systems that need it, and a kernel | |
6106 | * command line option might be useful. | |
55576cf1 | 6107 | */ |
2a15483b JS |
6108 | schedule_delayed_work(®ulator_init_complete_work, |
6109 | msecs_to_jiffies(30000)); | |
ca725561 MB |
6110 | |
6111 | return 0; | |
6112 | } | |
fd482a3e | 6113 | late_initcall_sync(regulator_init_complete); |