Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb | 53 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 54 | static LIST_HEAD(regulator_map_list); |
f19b00da | 55 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 56 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 57 | static bool has_full_constraints; |
414c70cb | 58 | |
1130e5b3 | 59 | static struct dentry *debugfs_root; |
1130e5b3 | 60 | |
8dc5390d | 61 | /* |
414c70cb LG |
62 | * struct regulator_map |
63 | * | |
64 | * Used to provide symbolic supply names to devices. | |
65 | */ | |
66 | struct regulator_map { | |
67 | struct list_head list; | |
40f9244f | 68 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 69 | const char *supply; |
a5766f11 | 70 | struct regulator_dev *regulator; |
414c70cb LG |
71 | }; |
72 | ||
f19b00da KM |
73 | /* |
74 | * struct regulator_enable_gpio | |
75 | * | |
76 | * Management for shared enable GPIO pin | |
77 | */ | |
78 | struct regulator_enable_gpio { | |
79 | struct list_head list; | |
778b28b4 | 80 | struct gpio_desc *gpiod; |
f19b00da KM |
81 | u32 enable_count; /* a number of enabled shared GPIO */ |
82 | u32 request_count; /* a number of requested shared GPIO */ | |
83 | unsigned int ena_gpio_invert:1; | |
84 | }; | |
85 | ||
a06ccd9c CK |
86 | /* |
87 | * struct regulator_supply_alias | |
88 | * | |
89 | * Used to map lookups for a supply onto an alternative device. | |
90 | */ | |
91 | struct regulator_supply_alias { | |
92 | struct list_head list; | |
93 | struct device *src_dev; | |
94 | const char *src_supply; | |
95 | struct device *alias_dev; | |
96 | const char *alias_supply; | |
97 | }; | |
98 | ||
414c70cb | 99 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 100 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
101 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
102 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
103 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 104 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 105 | unsigned long event, void *data); |
75790251 MB |
106 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
107 | int min_uV, int max_uV); | |
c054c6c7 MP |
108 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
109 | suspend_state_t state); | |
9243a195 MP |
110 | static int regulator_set_voltage_rdev(struct regulator_dev *rdev, |
111 | int min_uV, int max_uV, | |
112 | suspend_state_t state); | |
3801b86a MB |
113 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
114 | struct device *dev, | |
115 | const char *supply_name); | |
36a1f1b6 | 116 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 117 | |
1083c393 MB |
118 | static const char *rdev_get_name(struct regulator_dev *rdev) |
119 | { | |
120 | if (rdev->constraints && rdev->constraints->name) | |
121 | return rdev->constraints->name; | |
122 | else if (rdev->desc->name) | |
123 | return rdev->desc->name; | |
124 | else | |
125 | return ""; | |
126 | } | |
127 | ||
87b28417 MB |
128 | static bool have_full_constraints(void) |
129 | { | |
75bc9641 | 130 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
131 | } |
132 | ||
8a34e979 WP |
133 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
134 | { | |
135 | if (!rdev->constraints) { | |
136 | rdev_err(rdev, "no constraints\n"); | |
137 | return false; | |
138 | } | |
139 | ||
140 | if (rdev->constraints->valid_ops_mask & ops) | |
141 | return true; | |
142 | ||
143 | return false; | |
144 | } | |
145 | ||
70a7fb80 TR |
146 | static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev) |
147 | { | |
148 | if (rdev && rdev->supply) | |
149 | return rdev->supply->rdev; | |
150 | ||
151 | return NULL; | |
152 | } | |
153 | ||
66cf9a7e MP |
154 | /** |
155 | * regulator_lock_nested - lock a single regulator | |
156 | * @rdev: regulator source | |
157 | * @subclass: mutex subclass used for lockdep | |
158 | * | |
159 | * This function can be called many times by one task on | |
160 | * a single regulator and its mutex will be locked only | |
161 | * once. If a task, which is calling this function is other | |
162 | * than the one, which initially locked the mutex, it will | |
163 | * wait on mutex. | |
164 | */ | |
165 | static void regulator_lock_nested(struct regulator_dev *rdev, | |
166 | unsigned int subclass) | |
167 | { | |
168 | if (!mutex_trylock(&rdev->mutex)) { | |
169 | if (rdev->mutex_owner == current) { | |
170 | rdev->ref_cnt++; | |
171 | return; | |
172 | } | |
173 | mutex_lock_nested(&rdev->mutex, subclass); | |
174 | } | |
175 | ||
176 | rdev->ref_cnt = 1; | |
177 | rdev->mutex_owner = current; | |
178 | } | |
179 | ||
180 | static inline void regulator_lock(struct regulator_dev *rdev) | |
181 | { | |
182 | regulator_lock_nested(rdev, 0); | |
183 | } | |
184 | ||
185 | /** | |
186 | * regulator_unlock - unlock a single regulator | |
187 | * @rdev: regulator_source | |
188 | * | |
189 | * This function unlocks the mutex when the | |
190 | * reference counter reaches 0. | |
191 | */ | |
192 | static void regulator_unlock(struct regulator_dev *rdev) | |
193 | { | |
194 | if (rdev->ref_cnt != 0) { | |
195 | rdev->ref_cnt--; | |
196 | ||
197 | if (!rdev->ref_cnt) { | |
198 | rdev->mutex_owner = NULL; | |
199 | mutex_unlock(&rdev->mutex); | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
9243a195 MP |
204 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
205 | unsigned int subclass) | |
9f01cd4a | 206 | { |
9243a195 | 207 | struct regulator_dev *c_rdev; |
fa731ac7 | 208 | int i; |
9f01cd4a | 209 | |
9243a195 MP |
210 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
211 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
212 | ||
213 | if (!c_rdev) | |
214 | continue; | |
215 | ||
216 | regulator_lock_nested(c_rdev, subclass++); | |
217 | ||
218 | if (c_rdev->supply) | |
219 | subclass = | |
220 | regulator_lock_recursive(c_rdev->supply->rdev, | |
221 | subclass); | |
222 | } | |
223 | ||
224 | return subclass; | |
9f01cd4a SH |
225 | } |
226 | ||
227 | /** | |
9243a195 MP |
228 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
229 | * regulators | |
230 | * @rdev: regulator source | |
231 | * | |
232 | * Unlock all regulators related with rdev by coupling or suppling. | |
9f01cd4a | 233 | */ |
9243a195 | 234 | static void regulator_unlock_dependent(struct regulator_dev *rdev) |
9f01cd4a | 235 | { |
9243a195 MP |
236 | struct regulator_dev *c_rdev; |
237 | int i; | |
9f01cd4a | 238 | |
9243a195 MP |
239 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
240 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 241 | |
9243a195 MP |
242 | if (!c_rdev) |
243 | continue; | |
9f01cd4a | 244 | |
9243a195 MP |
245 | regulator_unlock(c_rdev); |
246 | ||
247 | if (c_rdev->supply) | |
248 | regulator_unlock_dependent(c_rdev->supply->rdev); | |
9f01cd4a SH |
249 | } |
250 | } | |
251 | ||
9243a195 MP |
252 | /** |
253 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators | |
254 | * @rdev: regulator source | |
255 | * | |
256 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
257 | * all regulators related with rdev by coupling or suppling. | |
258 | */ | |
259 | static inline void regulator_lock_dependent(struct regulator_dev *rdev) | |
260 | { | |
261 | regulator_lock_recursive(rdev, 0); | |
262 | } | |
263 | ||
69511a45 RN |
264 | /** |
265 | * of_get_regulator - get a regulator device node based on supply name | |
266 | * @dev: Device pointer for the consumer (of regulator) device | |
267 | * @supply: regulator supply name | |
268 | * | |
269 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 270 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
271 | * returns NULL. |
272 | */ | |
273 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
274 | { | |
275 | struct device_node *regnode = NULL; | |
276 | char prop_name[32]; /* 32 is max size of property name */ | |
277 | ||
278 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
279 | ||
280 | snprintf(prop_name, 32, "%s-supply", supply); | |
281 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
282 | ||
283 | if (!regnode) { | |
7799167b RH |
284 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
285 | prop_name, dev->of_node); | |
69511a45 RN |
286 | return NULL; |
287 | } | |
288 | return regnode; | |
289 | } | |
290 | ||
414c70cb LG |
291 | /* Platform voltage constraint check */ |
292 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
293 | int *min_uV, int *max_uV) | |
294 | { | |
295 | BUG_ON(*min_uV > *max_uV); | |
296 | ||
8a34e979 | 297 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 298 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
299 | return -EPERM; |
300 | } | |
301 | ||
302 | if (*max_uV > rdev->constraints->max_uV) | |
303 | *max_uV = rdev->constraints->max_uV; | |
304 | if (*min_uV < rdev->constraints->min_uV) | |
305 | *min_uV = rdev->constraints->min_uV; | |
306 | ||
89f425ed MB |
307 | if (*min_uV > *max_uV) { |
308 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 309 | *min_uV, *max_uV); |
414c70cb | 310 | return -EINVAL; |
89f425ed | 311 | } |
414c70cb LG |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
f7efad10 CZ |
316 | /* return 0 if the state is valid */ |
317 | static int regulator_check_states(suspend_state_t state) | |
318 | { | |
319 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
320 | } | |
321 | ||
05fda3b1 TP |
322 | /* Make sure we select a voltage that suits the needs of all |
323 | * regulator consumers | |
324 | */ | |
325 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
c360a6df CZ |
326 | int *min_uV, int *max_uV, |
327 | suspend_state_t state) | |
05fda3b1 TP |
328 | { |
329 | struct regulator *regulator; | |
c360a6df | 330 | struct regulator_voltage *voltage; |
05fda3b1 TP |
331 | |
332 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 333 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
334 | /* |
335 | * Assume consumers that didn't say anything are OK | |
336 | * with anything in the constraint range. | |
337 | */ | |
c360a6df | 338 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
339 | continue; |
340 | ||
c360a6df CZ |
341 | if (*max_uV > voltage->max_uV) |
342 | *max_uV = voltage->max_uV; | |
343 | if (*min_uV < voltage->min_uV) | |
344 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
345 | } |
346 | ||
dd8004af | 347 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
348 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
349 | *min_uV, *max_uV); | |
05fda3b1 | 350 | return -EINVAL; |
dd8004af | 351 | } |
05fda3b1 TP |
352 | |
353 | return 0; | |
354 | } | |
355 | ||
414c70cb LG |
356 | /* current constraint check */ |
357 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
358 | int *min_uA, int *max_uA) | |
359 | { | |
360 | BUG_ON(*min_uA > *max_uA); | |
361 | ||
8a34e979 | 362 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 363 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
364 | return -EPERM; |
365 | } | |
366 | ||
367 | if (*max_uA > rdev->constraints->max_uA) | |
368 | *max_uA = rdev->constraints->max_uA; | |
369 | if (*min_uA < rdev->constraints->min_uA) | |
370 | *min_uA = rdev->constraints->min_uA; | |
371 | ||
89f425ed MB |
372 | if (*min_uA > *max_uA) { |
373 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 374 | *min_uA, *max_uA); |
414c70cb | 375 | return -EINVAL; |
89f425ed | 376 | } |
414c70cb LG |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* operating mode constraint check */ | |
109c75af CK |
382 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
383 | unsigned int *mode) | |
414c70cb | 384 | { |
2c608234 | 385 | switch (*mode) { |
e573520b DB |
386 | case REGULATOR_MODE_FAST: |
387 | case REGULATOR_MODE_NORMAL: | |
388 | case REGULATOR_MODE_IDLE: | |
389 | case REGULATOR_MODE_STANDBY: | |
390 | break; | |
391 | default: | |
89f425ed | 392 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
393 | return -EINVAL; |
394 | } | |
395 | ||
8a34e979 | 396 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 397 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
398 | return -EPERM; |
399 | } | |
2c608234 MB |
400 | |
401 | /* The modes are bitmasks, the most power hungry modes having | |
402 | * the lowest values. If the requested mode isn't supported | |
403 | * try higher modes. */ | |
404 | while (*mode) { | |
405 | if (rdev->constraints->valid_modes_mask & *mode) | |
406 | return 0; | |
407 | *mode /= 2; | |
414c70cb | 408 | } |
2c608234 MB |
409 | |
410 | return -EINVAL; | |
414c70cb LG |
411 | } |
412 | ||
f7efad10 CZ |
413 | static inline struct regulator_state * |
414 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
415 | { | |
416 | if (rdev->constraints == NULL) | |
417 | return NULL; | |
418 | ||
419 | switch (state) { | |
420 | case PM_SUSPEND_STANDBY: | |
421 | return &rdev->constraints->state_standby; | |
422 | case PM_SUSPEND_MEM: | |
423 | return &rdev->constraints->state_mem; | |
424 | case PM_SUSPEND_MAX: | |
425 | return &rdev->constraints->state_disk; | |
426 | default: | |
427 | return NULL; | |
428 | } | |
429 | } | |
430 | ||
414c70cb LG |
431 | static ssize_t regulator_uV_show(struct device *dev, |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | ssize_t ret; |
436 | ||
66cf9a7e | 437 | regulator_lock(rdev); |
414c70cb | 438 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); |
66cf9a7e | 439 | regulator_unlock(rdev); |
414c70cb LG |
440 | |
441 | return ret; | |
442 | } | |
7ad68e2f | 443 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
444 | |
445 | static ssize_t regulator_uA_show(struct device *dev, | |
446 | struct device_attribute *attr, char *buf) | |
447 | { | |
a5766f11 | 448 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
449 | |
450 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
451 | } | |
7ad68e2f | 452 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 453 | |
587cea27 GKH |
454 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
455 | char *buf) | |
bc558a60 MB |
456 | { |
457 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 458 | |
1083c393 | 459 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 460 | } |
587cea27 | 461 | static DEVICE_ATTR_RO(name); |
bc558a60 | 462 | |
01de19d0 | 463 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 464 | { |
414c70cb LG |
465 | switch (mode) { |
466 | case REGULATOR_MODE_FAST: | |
01de19d0 | 467 | return "fast"; |
414c70cb | 468 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 469 | return "normal"; |
414c70cb | 470 | case REGULATOR_MODE_IDLE: |
01de19d0 | 471 | return "idle"; |
414c70cb | 472 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 473 | return "standby"; |
414c70cb | 474 | } |
01de19d0 DA |
475 | return "unknown"; |
476 | } | |
477 | ||
478 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
479 | { | |
480 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
481 | } |
482 | ||
4fca9545 DB |
483 | static ssize_t regulator_opmode_show(struct device *dev, |
484 | struct device_attribute *attr, char *buf) | |
414c70cb | 485 | { |
a5766f11 | 486 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 487 | |
4fca9545 DB |
488 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
489 | } | |
7ad68e2f | 490 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
491 | |
492 | static ssize_t regulator_print_state(char *buf, int state) | |
493 | { | |
414c70cb LG |
494 | if (state > 0) |
495 | return sprintf(buf, "enabled\n"); | |
496 | else if (state == 0) | |
497 | return sprintf(buf, "disabled\n"); | |
498 | else | |
499 | return sprintf(buf, "unknown\n"); | |
500 | } | |
501 | ||
4fca9545 DB |
502 | static ssize_t regulator_state_show(struct device *dev, |
503 | struct device_attribute *attr, char *buf) | |
504 | { | |
505 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
506 | ssize_t ret; |
507 | ||
66cf9a7e | 508 | regulator_lock(rdev); |
9332546f | 509 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 510 | regulator_unlock(rdev); |
4fca9545 | 511 | |
9332546f | 512 | return ret; |
4fca9545 | 513 | } |
7ad68e2f | 514 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 515 | |
853116a1 DB |
516 | static ssize_t regulator_status_show(struct device *dev, |
517 | struct device_attribute *attr, char *buf) | |
518 | { | |
519 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
520 | int status; | |
521 | char *label; | |
522 | ||
523 | status = rdev->desc->ops->get_status(rdev); | |
524 | if (status < 0) | |
525 | return status; | |
526 | ||
527 | switch (status) { | |
528 | case REGULATOR_STATUS_OFF: | |
529 | label = "off"; | |
530 | break; | |
531 | case REGULATOR_STATUS_ON: | |
532 | label = "on"; | |
533 | break; | |
534 | case REGULATOR_STATUS_ERROR: | |
535 | label = "error"; | |
536 | break; | |
537 | case REGULATOR_STATUS_FAST: | |
538 | label = "fast"; | |
539 | break; | |
540 | case REGULATOR_STATUS_NORMAL: | |
541 | label = "normal"; | |
542 | break; | |
543 | case REGULATOR_STATUS_IDLE: | |
544 | label = "idle"; | |
545 | break; | |
546 | case REGULATOR_STATUS_STANDBY: | |
547 | label = "standby"; | |
548 | break; | |
f59c8f9f MB |
549 | case REGULATOR_STATUS_BYPASS: |
550 | label = "bypass"; | |
551 | break; | |
1beaf762 KG |
552 | case REGULATOR_STATUS_UNDEFINED: |
553 | label = "undefined"; | |
554 | break; | |
853116a1 DB |
555 | default: |
556 | return -ERANGE; | |
557 | } | |
558 | ||
559 | return sprintf(buf, "%s\n", label); | |
560 | } | |
561 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
562 | ||
414c70cb LG |
563 | static ssize_t regulator_min_uA_show(struct device *dev, |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
a5766f11 | 566 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
567 | |
568 | if (!rdev->constraints) | |
569 | return sprintf(buf, "constraint not defined\n"); | |
570 | ||
571 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
572 | } | |
7ad68e2f | 573 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
574 | |
575 | static ssize_t regulator_max_uA_show(struct device *dev, | |
576 | struct device_attribute *attr, char *buf) | |
577 | { | |
a5766f11 | 578 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
579 | |
580 | if (!rdev->constraints) | |
581 | return sprintf(buf, "constraint not defined\n"); | |
582 | ||
583 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
584 | } | |
7ad68e2f | 585 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
586 | |
587 | static ssize_t regulator_min_uV_show(struct device *dev, | |
588 | struct device_attribute *attr, char *buf) | |
589 | { | |
a5766f11 | 590 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
591 | |
592 | if (!rdev->constraints) | |
593 | return sprintf(buf, "constraint not defined\n"); | |
594 | ||
595 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
596 | } | |
7ad68e2f | 597 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
598 | |
599 | static ssize_t regulator_max_uV_show(struct device *dev, | |
600 | struct device_attribute *attr, char *buf) | |
601 | { | |
a5766f11 | 602 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
603 | |
604 | if (!rdev->constraints) | |
605 | return sprintf(buf, "constraint not defined\n"); | |
606 | ||
607 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
608 | } | |
7ad68e2f | 609 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
610 | |
611 | static ssize_t regulator_total_uA_show(struct device *dev, | |
612 | struct device_attribute *attr, char *buf) | |
613 | { | |
a5766f11 | 614 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
615 | struct regulator *regulator; |
616 | int uA = 0; | |
617 | ||
66cf9a7e | 618 | regulator_lock(rdev); |
414c70cb | 619 | list_for_each_entry(regulator, &rdev->consumer_list, list) |
fa2984d4 | 620 | uA += regulator->uA_load; |
66cf9a7e | 621 | regulator_unlock(rdev); |
414c70cb LG |
622 | return sprintf(buf, "%d\n", uA); |
623 | } | |
7ad68e2f | 624 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 625 | |
587cea27 GKH |
626 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
627 | char *buf) | |
414c70cb | 628 | { |
a5766f11 | 629 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
630 | return sprintf(buf, "%d\n", rdev->use_count); |
631 | } | |
587cea27 | 632 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 633 | |
587cea27 GKH |
634 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
635 | char *buf) | |
414c70cb | 636 | { |
a5766f11 | 637 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
638 | |
639 | switch (rdev->desc->type) { | |
640 | case REGULATOR_VOLTAGE: | |
641 | return sprintf(buf, "voltage\n"); | |
642 | case REGULATOR_CURRENT: | |
643 | return sprintf(buf, "current\n"); | |
644 | } | |
645 | return sprintf(buf, "unknown\n"); | |
646 | } | |
587cea27 | 647 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
648 | |
649 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
650 | struct device_attribute *attr, char *buf) | |
651 | { | |
a5766f11 | 652 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 653 | |
414c70cb LG |
654 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
655 | } | |
7ad68e2f DB |
656 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
657 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
658 | |
659 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
660 | struct device_attribute *attr, char *buf) | |
661 | { | |
a5766f11 | 662 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 663 | |
414c70cb LG |
664 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
665 | } | |
7ad68e2f DB |
666 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
667 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
668 | |
669 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
670 | struct device_attribute *attr, char *buf) | |
671 | { | |
a5766f11 | 672 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 673 | |
414c70cb LG |
674 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
675 | } | |
7ad68e2f DB |
676 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
677 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 678 | |
414c70cb LG |
679 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
680 | struct device_attribute *attr, char *buf) | |
681 | { | |
a5766f11 | 682 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 683 | |
4fca9545 DB |
684 | return regulator_print_opmode(buf, |
685 | rdev->constraints->state_mem.mode); | |
414c70cb | 686 | } |
7ad68e2f DB |
687 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
688 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
689 | |
690 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
691 | struct device_attribute *attr, char *buf) | |
692 | { | |
a5766f11 | 693 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 694 | |
4fca9545 DB |
695 | return regulator_print_opmode(buf, |
696 | rdev->constraints->state_disk.mode); | |
414c70cb | 697 | } |
7ad68e2f DB |
698 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
699 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
700 | |
701 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
702 | struct device_attribute *attr, char *buf) | |
703 | { | |
a5766f11 | 704 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 705 | |
4fca9545 DB |
706 | return regulator_print_opmode(buf, |
707 | rdev->constraints->state_standby.mode); | |
414c70cb | 708 | } |
7ad68e2f DB |
709 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
710 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
711 | |
712 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
713 | struct device_attribute *attr, char *buf) | |
714 | { | |
a5766f11 | 715 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 716 | |
4fca9545 DB |
717 | return regulator_print_state(buf, |
718 | rdev->constraints->state_mem.enabled); | |
414c70cb | 719 | } |
7ad68e2f DB |
720 | static DEVICE_ATTR(suspend_mem_state, 0444, |
721 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
722 | |
723 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
724 | struct device_attribute *attr, char *buf) | |
725 | { | |
a5766f11 | 726 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 727 | |
4fca9545 DB |
728 | return regulator_print_state(buf, |
729 | rdev->constraints->state_disk.enabled); | |
414c70cb | 730 | } |
7ad68e2f DB |
731 | static DEVICE_ATTR(suspend_disk_state, 0444, |
732 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
733 | |
734 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
735 | struct device_attribute *attr, char *buf) | |
736 | { | |
a5766f11 | 737 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 738 | |
4fca9545 DB |
739 | return regulator_print_state(buf, |
740 | rdev->constraints->state_standby.enabled); | |
414c70cb | 741 | } |
7ad68e2f DB |
742 | static DEVICE_ATTR(suspend_standby_state, 0444, |
743 | regulator_suspend_standby_state_show, NULL); | |
744 | ||
f59c8f9f MB |
745 | static ssize_t regulator_bypass_show(struct device *dev, |
746 | struct device_attribute *attr, char *buf) | |
747 | { | |
748 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
749 | const char *report; | |
750 | bool bypass; | |
751 | int ret; | |
752 | ||
753 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
754 | ||
755 | if (ret != 0) | |
756 | report = "unknown"; | |
757 | else if (bypass) | |
758 | report = "enabled"; | |
759 | else | |
760 | report = "disabled"; | |
761 | ||
762 | return sprintf(buf, "%s\n", report); | |
763 | } | |
764 | static DEVICE_ATTR(bypass, 0444, | |
765 | regulator_bypass_show, NULL); | |
bc558a60 | 766 | |
414c70cb LG |
767 | /* Calculate the new optimum regulator operating mode based on the new total |
768 | * consumer load. All locks held by caller */ | |
8460ef38 | 769 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
770 | { |
771 | struct regulator *sibling; | |
772 | int current_uA = 0, output_uV, input_uV, err; | |
773 | unsigned int mode; | |
774 | ||
70cfef26 KK |
775 | lockdep_assert_held_once(&rdev->mutex); |
776 | ||
8460ef38 BA |
777 | /* |
778 | * first check to see if we can set modes at all, otherwise just | |
779 | * tell the consumer everything is OK. | |
780 | */ | |
8a34e979 | 781 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
8460ef38 BA |
782 | return 0; |
783 | ||
8f4490e0 BA |
784 | if (!rdev->desc->ops->get_optimum_mode && |
785 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
786 | return 0; |
787 | ||
8f4490e0 BA |
788 | if (!rdev->desc->ops->set_mode && |
789 | !rdev->desc->ops->set_load) | |
8460ef38 | 790 | return -EINVAL; |
414c70cb | 791 | |
414c70cb LG |
792 | /* calc total requested load */ |
793 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 794 | current_uA += sibling->uA_load; |
414c70cb | 795 | |
22a10bca SB |
796 | current_uA += rdev->constraints->system_load; |
797 | ||
8f4490e0 BA |
798 | if (rdev->desc->ops->set_load) { |
799 | /* set the optimum mode for our new total regulator load */ | |
800 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
801 | if (err < 0) | |
802 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
803 | } else { | |
57776617 JP |
804 | /* get output voltage */ |
805 | output_uV = _regulator_get_voltage(rdev); | |
806 | if (output_uV <= 0) { | |
807 | rdev_err(rdev, "invalid output voltage found\n"); | |
808 | return -EINVAL; | |
809 | } | |
810 | ||
811 | /* get input voltage */ | |
812 | input_uV = 0; | |
813 | if (rdev->supply) | |
814 | input_uV = regulator_get_voltage(rdev->supply); | |
815 | if (input_uV <= 0) | |
816 | input_uV = rdev->constraints->input_uV; | |
817 | if (input_uV <= 0) { | |
818 | rdev_err(rdev, "invalid input voltage found\n"); | |
819 | return -EINVAL; | |
820 | } | |
821 | ||
8f4490e0 BA |
822 | /* now get the optimum mode for our new total regulator load */ |
823 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
824 | output_uV, current_uA); | |
825 | ||
826 | /* check the new mode is allowed */ | |
827 | err = regulator_mode_constrain(rdev, &mode); | |
828 | if (err < 0) { | |
829 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
830 | current_uA, input_uV, output_uV); | |
831 | return err; | |
832 | } | |
414c70cb | 833 | |
8f4490e0 BA |
834 | err = rdev->desc->ops->set_mode(rdev, mode); |
835 | if (err < 0) | |
836 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
837 | } |
838 | ||
8460ef38 | 839 | return err; |
414c70cb LG |
840 | } |
841 | ||
842 | static int suspend_set_state(struct regulator_dev *rdev, | |
f7efad10 | 843 | suspend_state_t state) |
414c70cb LG |
844 | { |
845 | int ret = 0; | |
f7efad10 CZ |
846 | struct regulator_state *rstate; |
847 | ||
848 | rstate = regulator_get_suspend_state(rdev, state); | |
849 | if (rstate == NULL) | |
57a0dd18 | 850 | return 0; |
638f85c5 MB |
851 | |
852 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
853 | * only warn if the driver implements set_suspend_voltage or |
854 | * set_suspend_mode callback. | |
638f85c5 | 855 | */ |
72069f99 CZ |
856 | if (rstate->enabled != ENABLE_IN_SUSPEND && |
857 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
8ac0e95d AL |
858 | if (rdev->desc->ops->set_suspend_voltage || |
859 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 860 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
861 | return 0; |
862 | } | |
863 | ||
72069f99 CZ |
864 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
865 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 866 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
867 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
868 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 869 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
870 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
871 | ret = 0; | |
872 | ||
414c70cb | 873 | if (ret < 0) { |
5da84fd9 | 874 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
875 | return ret; |
876 | } | |
877 | ||
878 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
879 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
880 | if (ret < 0) { | |
5da84fd9 | 881 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
882 | return ret; |
883 | } | |
884 | } | |
885 | ||
886 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
887 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
888 | if (ret < 0) { | |
5da84fd9 | 889 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
890 | return ret; |
891 | } | |
892 | } | |
414c70cb | 893 | |
f7efad10 | 894 | return ret; |
414c70cb LG |
895 | } |
896 | ||
897 | static void print_constraints(struct regulator_dev *rdev) | |
898 | { | |
899 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 900 | char buf[160] = ""; |
5751a99f | 901 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
902 | int count = 0; |
903 | int ret; | |
414c70cb | 904 | |
8f031b48 | 905 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 906 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
907 | count += scnprintf(buf + count, len - count, "%d mV ", |
908 | constraints->min_uV / 1000); | |
414c70cb | 909 | else |
5751a99f SW |
910 | count += scnprintf(buf + count, len - count, |
911 | "%d <--> %d mV ", | |
912 | constraints->min_uV / 1000, | |
913 | constraints->max_uV / 1000); | |
8f031b48 MB |
914 | } |
915 | ||
916 | if (!constraints->min_uV || | |
917 | constraints->min_uV != constraints->max_uV) { | |
918 | ret = _regulator_get_voltage(rdev); | |
919 | if (ret > 0) | |
5751a99f SW |
920 | count += scnprintf(buf + count, len - count, |
921 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
922 | } |
923 | ||
bf5892a8 | 924 | if (constraints->uV_offset) |
5751a99f SW |
925 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
926 | constraints->uV_offset / 1000); | |
bf5892a8 | 927 | |
8f031b48 | 928 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 929 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
930 | count += scnprintf(buf + count, len - count, "%d mA ", |
931 | constraints->min_uA / 1000); | |
414c70cb | 932 | else |
5751a99f SW |
933 | count += scnprintf(buf + count, len - count, |
934 | "%d <--> %d mA ", | |
935 | constraints->min_uA / 1000, | |
936 | constraints->max_uA / 1000); | |
8f031b48 MB |
937 | } |
938 | ||
939 | if (!constraints->min_uA || | |
940 | constraints->min_uA != constraints->max_uA) { | |
941 | ret = _regulator_get_current_limit(rdev); | |
942 | if (ret > 0) | |
5751a99f SW |
943 | count += scnprintf(buf + count, len - count, |
944 | "at %d mA ", ret / 1000); | |
414c70cb | 945 | } |
8f031b48 | 946 | |
414c70cb | 947 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 948 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 949 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 950 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 951 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 952 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 953 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 954 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 955 | |
215b8b05 | 956 | if (!count) |
5751a99f | 957 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 958 | |
194dbaef | 959 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
960 | |
961 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 962 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
963 | rdev_warn(rdev, |
964 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
965 | } |
966 | ||
e79055d6 | 967 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 968 | struct regulation_constraints *constraints) |
a5766f11 | 969 | { |
272e2315 | 970 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
971 | int ret; |
972 | ||
973 | /* do we need to apply the constraint voltage */ | |
974 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
975 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
976 | int target_min, target_max; | |
064d5cd1 | 977 | int current_uV = _regulator_get_voltage(rdev); |
84b3a7c9 DA |
978 | |
979 | if (current_uV == -ENOTRECOVERABLE) { | |
980 | /* This regulator can't be read and must be initted */ | |
981 | rdev_info(rdev, "Setting %d-%duV\n", | |
982 | rdev->constraints->min_uV, | |
983 | rdev->constraints->max_uV); | |
984 | _regulator_do_set_voltage(rdev, | |
985 | rdev->constraints->min_uV, | |
986 | rdev->constraints->max_uV); | |
987 | current_uV = _regulator_get_voltage(rdev); | |
988 | } | |
989 | ||
064d5cd1 | 990 | if (current_uV < 0) { |
69d58839 NM |
991 | rdev_err(rdev, |
992 | "failed to get the current voltage(%d)\n", | |
993 | current_uV); | |
064d5cd1 AB |
994 | return current_uV; |
995 | } | |
fa93fd4e MB |
996 | |
997 | /* | |
998 | * If we're below the minimum voltage move up to the | |
999 | * minimum voltage, if we're above the maximum voltage | |
1000 | * then move down to the maximum. | |
1001 | */ | |
1002 | target_min = current_uV; | |
1003 | target_max = current_uV; | |
1004 | ||
1005 | if (current_uV < rdev->constraints->min_uV) { | |
1006 | target_min = rdev->constraints->min_uV; | |
1007 | target_max = rdev->constraints->min_uV; | |
1008 | } | |
1009 | ||
1010 | if (current_uV > rdev->constraints->max_uV) { | |
1011 | target_min = rdev->constraints->max_uV; | |
1012 | target_max = rdev->constraints->max_uV; | |
1013 | } | |
1014 | ||
1015 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1016 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1017 | current_uV, target_min, target_max); | |
064d5cd1 | 1018 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1019 | rdev, target_min, target_max); |
064d5cd1 AB |
1020 | if (ret < 0) { |
1021 | rdev_err(rdev, | |
fa93fd4e MB |
1022 | "failed to apply %d-%duV constraint(%d)\n", |
1023 | target_min, target_max, ret); | |
064d5cd1 AB |
1024 | return ret; |
1025 | } | |
75790251 | 1026 | } |
af5866c9 | 1027 | } |
e06f5b4f | 1028 | |
4367cfdc DB |
1029 | /* constrain machine-level voltage specs to fit |
1030 | * the actual range supported by this regulator. | |
1031 | */ | |
1032 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1033 | int count = rdev->desc->n_voltages; | |
1034 | int i; | |
1035 | int min_uV = INT_MAX; | |
1036 | int max_uV = INT_MIN; | |
1037 | int cmin = constraints->min_uV; | |
1038 | int cmax = constraints->max_uV; | |
1039 | ||
3e590918 MB |
1040 | /* it's safe to autoconfigure fixed-voltage supplies |
1041 | and the constraints are used by list_voltage. */ | |
4367cfdc | 1042 | if (count == 1 && !cmin) { |
3e590918 | 1043 | cmin = 1; |
4367cfdc | 1044 | cmax = INT_MAX; |
3e590918 MB |
1045 | constraints->min_uV = cmin; |
1046 | constraints->max_uV = cmax; | |
4367cfdc DB |
1047 | } |
1048 | ||
3e2b9abd MB |
1049 | /* voltage constraints are optional */ |
1050 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1051 | return 0; |
3e2b9abd | 1052 | |
4367cfdc | 1053 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1054 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1055 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1056 | return -EINVAL; |
4367cfdc DB |
1057 | } |
1058 | ||
1059 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
1060 | for (i = 0; i < count; i++) { | |
1061 | int value; | |
1062 | ||
1063 | value = ops->list_voltage(rdev, i); | |
1064 | if (value <= 0) | |
1065 | continue; | |
1066 | ||
1067 | /* maybe adjust [min_uV..max_uV] */ | |
1068 | if (value >= cmin && value < min_uV) | |
1069 | min_uV = value; | |
1070 | if (value <= cmax && value > max_uV) | |
1071 | max_uV = value; | |
1072 | } | |
1073 | ||
1074 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1075 | if (max_uV < min_uV) { | |
fff15bef MB |
1076 | rdev_err(rdev, |
1077 | "unsupportable voltage constraints %u-%uuV\n", | |
1078 | min_uV, max_uV); | |
e79055d6 | 1079 | return -EINVAL; |
4367cfdc DB |
1080 | } |
1081 | ||
1082 | /* use regulator's subset of machine constraints */ | |
1083 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1084 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1085 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1086 | constraints->min_uV = min_uV; |
1087 | } | |
1088 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1089 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1090 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1091 | constraints->max_uV = max_uV; |
1092 | } | |
1093 | } | |
1094 | ||
e79055d6 MB |
1095 | return 0; |
1096 | } | |
1097 | ||
f8c1700d LD |
1098 | static int machine_constraints_current(struct regulator_dev *rdev, |
1099 | struct regulation_constraints *constraints) | |
1100 | { | |
272e2315 | 1101 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1102 | int ret; |
1103 | ||
1104 | if (!constraints->min_uA && !constraints->max_uA) | |
1105 | return 0; | |
1106 | ||
1107 | if (constraints->min_uA > constraints->max_uA) { | |
1108 | rdev_err(rdev, "Invalid current constraints\n"); | |
1109 | return -EINVAL; | |
1110 | } | |
1111 | ||
1112 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1113 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /* Set regulator current in constraints range */ | |
1118 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1119 | constraints->max_uA); | |
1120 | if (ret < 0) { | |
1121 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
30c21971 MP |
1128 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1129 | ||
e79055d6 MB |
1130 | /** |
1131 | * set_machine_constraints - sets regulator constraints | |
1132 | * @rdev: regulator source | |
1133 | * @constraints: constraints to apply | |
1134 | * | |
1135 | * Allows platform initialisation code to define and constrain | |
1136 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1137 | * Constraints *must* be set by platform code in order for some | |
1138 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1139 | * set_mode. | |
1140 | */ | |
1141 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1142 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1143 | { |
1144 | int ret = 0; | |
272e2315 | 1145 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1146 | |
9a8f5e07 MB |
1147 | if (constraints) |
1148 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1149 | GFP_KERNEL); | |
1150 | else | |
1151 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1152 | GFP_KERNEL); | |
f8c12fe3 MB |
1153 | if (!rdev->constraints) |
1154 | return -ENOMEM; | |
af5866c9 | 1155 | |
f8c12fe3 | 1156 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1157 | if (ret != 0) |
6333ef46 | 1158 | return ret; |
e79055d6 | 1159 | |
f8c1700d | 1160 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1161 | if (ret != 0) |
6333ef46 | 1162 | return ret; |
e79055d6 | 1163 | |
36e4f839 SB |
1164 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1165 | ret = ops->set_input_current_limit(rdev, | |
1166 | rdev->constraints->ilim_uA); | |
1167 | if (ret < 0) { | |
1168 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1169 | return ret; |
36e4f839 SB |
1170 | } |
1171 | } | |
1172 | ||
a5766f11 | 1173 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1174 | if (rdev->constraints->initial_state) { |
f7efad10 | 1175 | ret = suspend_set_state(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1176 | if (ret < 0) { |
5da84fd9 | 1177 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1178 | return ret; |
e06f5b4f MB |
1179 | } |
1180 | } | |
a5766f11 | 1181 | |
9a8f5e07 | 1182 | if (rdev->constraints->initial_mode) { |
a308466c | 1183 | if (!ops->set_mode) { |
5da84fd9 | 1184 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1185 | return -EINVAL; |
a308466c MB |
1186 | } |
1187 | ||
f8c12fe3 | 1188 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1189 | if (ret < 0) { |
5da84fd9 | 1190 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1191 | return ret; |
a308466c MB |
1192 | } |
1193 | } | |
1194 | ||
cacf90f2 MB |
1195 | /* If the constraints say the regulator should be on at this point |
1196 | * and we have control then make sure it is enabled. | |
1197 | */ | |
30c21971 MP |
1198 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1199 | ret = _regulator_do_enable(rdev); | |
1200 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1201 | rdev_err(rdev, "failed to enable\n"); |
6333ef46 | 1202 | return ret; |
e5fda26c MB |
1203 | } |
1204 | } | |
1205 | ||
1653ccf4 YSB |
1206 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1207 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1208 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1209 | if (ret < 0) { | |
1210 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1211 | return ret; |
6f0b2c69 YSB |
1212 | } |
1213 | } | |
1214 | ||
23c779b9 SB |
1215 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1216 | ret = ops->set_pull_down(rdev); | |
1217 | if (ret < 0) { | |
1218 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1219 | return ret; |
23c779b9 SB |
1220 | } |
1221 | } | |
1222 | ||
57f66b78 SB |
1223 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1224 | ret = ops->set_soft_start(rdev); | |
1225 | if (ret < 0) { | |
1226 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1227 | return ret; |
57f66b78 SB |
1228 | } |
1229 | } | |
1230 | ||
3a003bae SB |
1231 | if (rdev->constraints->over_current_protection |
1232 | && ops->set_over_current_protection) { | |
1233 | ret = ops->set_over_current_protection(rdev); | |
1234 | if (ret < 0) { | |
1235 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1236 | return ret; |
3a003bae SB |
1237 | } |
1238 | } | |
1239 | ||
670666b9 LD |
1240 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1241 | bool ad_state = (rdev->constraints->active_discharge == | |
1242 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1243 | ||
1244 | ret = ops->set_active_discharge(rdev, ad_state); | |
1245 | if (ret < 0) { | |
1246 | rdev_err(rdev, "failed to set active discharge\n"); | |
1247 | return ret; | |
1248 | } | |
1249 | } | |
1250 | ||
a5766f11 | 1251 | print_constraints(rdev); |
1a6958e7 | 1252 | return 0; |
a5766f11 LG |
1253 | } |
1254 | ||
1255 | /** | |
1256 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1257 | * @rdev: regulator name |
1258 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1259 | * |
1260 | * Called by platform initialisation code to set the supply regulator for this | |
1261 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1262 | * core if it's child is enabled. | |
1263 | */ | |
1264 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1265 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1266 | { |
1267 | int err; | |
1268 | ||
3801b86a MB |
1269 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1270 | ||
e2c09ae7 JMC |
1271 | if (!try_module_get(supply_rdev->owner)) |
1272 | return -ENODEV; | |
1273 | ||
3801b86a | 1274 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1275 | if (rdev->supply == NULL) { |
1276 | err = -ENOMEM; | |
3801b86a | 1277 | return err; |
a5766f11 | 1278 | } |
57ad526a | 1279 | supply_rdev->open_count++; |
3801b86a MB |
1280 | |
1281 | return 0; | |
a5766f11 LG |
1282 | } |
1283 | ||
1284 | /** | |
06c63f93 | 1285 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1286 | * @rdev: regulator source |
40f9244f | 1287 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1288 | * @supply: symbolic name for supply |
a5766f11 LG |
1289 | * |
1290 | * Allows platform initialisation code to map physical regulator | |
1291 | * sources to symbolic names for supplies for use by devices. Devices | |
1292 | * should use these symbolic names to request regulators, avoiding the | |
1293 | * need to provide board-specific regulator names as platform data. | |
1294 | */ | |
1295 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1296 | const char *consumer_dev_name, |
1297 | const char *supply) | |
a5766f11 LG |
1298 | { |
1299 | struct regulator_map *node; | |
9ed2099e | 1300 | int has_dev; |
a5766f11 LG |
1301 | |
1302 | if (supply == NULL) | |
1303 | return -EINVAL; | |
1304 | ||
9ed2099e MB |
1305 | if (consumer_dev_name != NULL) |
1306 | has_dev = 1; | |
1307 | else | |
1308 | has_dev = 0; | |
1309 | ||
6001e13c | 1310 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1311 | if (node->dev_name && consumer_dev_name) { |
1312 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1313 | continue; | |
1314 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1315 | continue; |
23b5cc2a JN |
1316 | } |
1317 | ||
6001e13c DB |
1318 | if (strcmp(node->supply, supply) != 0) |
1319 | continue; | |
1320 | ||
737f360d MB |
1321 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1322 | consumer_dev_name, | |
1323 | dev_name(&node->regulator->dev), | |
1324 | node->regulator->desc->name, | |
1325 | supply, | |
1326 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1327 | return -EBUSY; |
1328 | } | |
1329 | ||
9ed2099e | 1330 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1331 | if (node == NULL) |
1332 | return -ENOMEM; | |
1333 | ||
1334 | node->regulator = rdev; | |
a5766f11 LG |
1335 | node->supply = supply; |
1336 | ||
9ed2099e MB |
1337 | if (has_dev) { |
1338 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1339 | if (node->dev_name == NULL) { | |
1340 | kfree(node); | |
1341 | return -ENOMEM; | |
1342 | } | |
40f9244f MB |
1343 | } |
1344 | ||
a5766f11 LG |
1345 | list_add(&node->list, ®ulator_map_list); |
1346 | return 0; | |
1347 | } | |
1348 | ||
0f1d747b MR |
1349 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1350 | { | |
1351 | struct regulator_map *node, *n; | |
1352 | ||
1353 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1354 | if (rdev == node->regulator) { | |
1355 | list_del(&node->list); | |
40f9244f | 1356 | kfree(node->dev_name); |
0f1d747b | 1357 | kfree(node); |
0f1d747b MR |
1358 | } |
1359 | } | |
1360 | } | |
1361 | ||
2d80a91b RF |
1362 | #ifdef CONFIG_DEBUG_FS |
1363 | static ssize_t constraint_flags_read_file(struct file *file, | |
1364 | char __user *user_buf, | |
1365 | size_t count, loff_t *ppos) | |
1366 | { | |
1367 | const struct regulator *regulator = file->private_data; | |
1368 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1369 | char *buf; | |
1370 | ssize_t ret; | |
1371 | ||
1372 | if (!c) | |
1373 | return 0; | |
1374 | ||
1375 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1376 | if (!buf) | |
1377 | return -ENOMEM; | |
1378 | ||
1379 | ret = snprintf(buf, PAGE_SIZE, | |
1380 | "always_on: %u\n" | |
1381 | "boot_on: %u\n" | |
1382 | "apply_uV: %u\n" | |
1383 | "ramp_disable: %u\n" | |
1384 | "soft_start: %u\n" | |
1385 | "pull_down: %u\n" | |
1386 | "over_current_protection: %u\n", | |
1387 | c->always_on, | |
1388 | c->boot_on, | |
1389 | c->apply_uV, | |
1390 | c->ramp_disable, | |
1391 | c->soft_start, | |
1392 | c->pull_down, | |
1393 | c->over_current_protection); | |
1394 | ||
1395 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1396 | kfree(buf); | |
1397 | ||
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | #endif | |
1402 | ||
1403 | static const struct file_operations constraint_flags_fops = { | |
1404 | #ifdef CONFIG_DEBUG_FS | |
1405 | .open = simple_open, | |
1406 | .read = constraint_flags_read_file, | |
1407 | .llseek = default_llseek, | |
1408 | #endif | |
1409 | }; | |
1410 | ||
f5726ae3 | 1411 | #define REG_STR_SIZE 64 |
414c70cb LG |
1412 | |
1413 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1414 | struct device *dev, | |
1415 | const char *supply_name) | |
1416 | { | |
1417 | struct regulator *regulator; | |
1418 | char buf[REG_STR_SIZE]; | |
1419 | int err, size; | |
1420 | ||
1421 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1422 | if (regulator == NULL) | |
1423 | return NULL; | |
1424 | ||
66cf9a7e | 1425 | regulator_lock(rdev); |
414c70cb LG |
1426 | regulator->rdev = rdev; |
1427 | list_add(®ulator->list, &rdev->consumer_list); | |
1428 | ||
1429 | if (dev) { | |
e2c98eaf SG |
1430 | regulator->dev = dev; |
1431 | ||
222cc7b1 | 1432 | /* Add a link to the device sysfs entry */ |
b7cd1b13 BG |
1433 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", |
1434 | dev->kobj.name, supply_name); | |
414c70cb | 1435 | if (size >= REG_STR_SIZE) |
222cc7b1 | 1436 | goto overflow_err; |
414c70cb LG |
1437 | |
1438 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1439 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1440 | goto overflow_err; |
414c70cb | 1441 | |
ff268b56 | 1442 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1443 | buf); |
1444 | if (err) { | |
ff268b56 | 1445 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1446 | dev->kobj.name, err); |
222cc7b1 | 1447 | /* non-fatal */ |
414c70cb | 1448 | } |
5de70519 | 1449 | } else { |
0630b614 | 1450 | regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL); |
5de70519 | 1451 | if (regulator->supply_name == NULL) |
222cc7b1 | 1452 | goto overflow_err; |
5de70519 MB |
1453 | } |
1454 | ||
5de70519 MB |
1455 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1456 | rdev->debugfs); | |
24751434 | 1457 | if (!regulator->debugfs) { |
ad3a942b | 1458 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1459 | } else { |
1460 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1461 | ®ulator->uA_load); | |
1462 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1463 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1464 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1465 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1466 | debugfs_create_file("constraint_flags", 0444, |
1467 | regulator->debugfs, regulator, | |
1468 | &constraint_flags_fops); | |
414c70cb | 1469 | } |
5de70519 | 1470 | |
6492bc1b MB |
1471 | /* |
1472 | * Check now if the regulator is an always on regulator - if | |
1473 | * it is then we don't need to do nearly so much work for | |
1474 | * enable/disable calls. | |
1475 | */ | |
8a34e979 | 1476 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1477 | _regulator_is_enabled(rdev)) |
1478 | regulator->always_on = true; | |
1479 | ||
66cf9a7e | 1480 | regulator_unlock(rdev); |
414c70cb | 1481 | return regulator; |
414c70cb LG |
1482 | overflow_err: |
1483 | list_del(®ulator->list); | |
1484 | kfree(regulator); | |
66cf9a7e | 1485 | regulator_unlock(rdev); |
414c70cb LG |
1486 | return NULL; |
1487 | } | |
1488 | ||
31aae2be MB |
1489 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1490 | { | |
00c877c6 LD |
1491 | if (rdev->constraints && rdev->constraints->enable_time) |
1492 | return rdev->constraints->enable_time; | |
31aae2be | 1493 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1494 | return rdev->desc->enable_time; |
31aae2be MB |
1495 | return rdev->desc->ops->enable_time(rdev); |
1496 | } | |
1497 | ||
a06ccd9c CK |
1498 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1499 | struct device *dev, const char *supply) | |
1500 | { | |
1501 | struct regulator_supply_alias *map; | |
1502 | ||
1503 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1504 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1505 | return map; | |
1506 | ||
1507 | return NULL; | |
1508 | } | |
1509 | ||
1510 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1511 | { | |
1512 | struct regulator_supply_alias *map; | |
1513 | ||
1514 | map = regulator_find_supply_alias(*dev, *supply); | |
1515 | if (map) { | |
1516 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1517 | *supply, map->alias_supply, | |
1518 | dev_name(map->alias_dev)); | |
1519 | *dev = map->alias_dev; | |
1520 | *supply = map->alias_supply; | |
1521 | } | |
1522 | } | |
1523 | ||
85f3b431 TV |
1524 | static int regulator_match(struct device *dev, const void *data) |
1525 | { | |
1526 | struct regulator_dev *r = dev_to_rdev(dev); | |
1527 | ||
1528 | return strcmp(rdev_get_name(r), data) == 0; | |
1529 | } | |
1530 | ||
1531 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1532 | { | |
1533 | struct device *dev; | |
1534 | ||
1535 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1536 | ||
1537 | return dev ? dev_to_rdev(dev) : NULL; | |
1538 | } | |
1539 | ||
1540 | /** | |
1541 | * regulator_dev_lookup - lookup a regulator device. | |
1542 | * @dev: device for regulator "consumer". | |
1543 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1544 | * |
1545 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1546 | * @supply and with the embedded struct device refcount incremented by one. |
1547 | * The refcount must be dropped by calling put_device(). | |
1548 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1549 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1550 | * in the future. | |
85f3b431 | 1551 | */ |
69511a45 | 1552 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1553 | const char *supply) |
69511a45 | 1554 | { |
06217197 | 1555 | struct regulator_dev *r = NULL; |
69511a45 | 1556 | struct device_node *node; |
576ca436 MB |
1557 | struct regulator_map *map; |
1558 | const char *devname = NULL; | |
69511a45 | 1559 | |
a06ccd9c CK |
1560 | regulator_supply_alias(&dev, &supply); |
1561 | ||
69511a45 RN |
1562 | /* first do a dt based lookup */ |
1563 | if (dev && dev->of_node) { | |
1564 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1565 | if (node) { |
85f3b431 TV |
1566 | r = of_find_regulator_by_node(node); |
1567 | if (r) | |
1568 | return r; | |
163478da | 1569 | |
6d191a5f | 1570 | /* |
163478da DT |
1571 | * We have a node, but there is no device. |
1572 | * assume it has not registered yet. | |
6d191a5f | 1573 | */ |
163478da | 1574 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1575 | } |
69511a45 RN |
1576 | } |
1577 | ||
1578 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1579 | if (dev) |
1580 | devname = dev_name(dev); | |
1581 | ||
85f3b431 | 1582 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1583 | list_for_each_entry(map, ®ulator_map_list, list) { |
1584 | /* If the mapping has a device set up it must match */ | |
1585 | if (map->dev_name && | |
1586 | (!devname || strcmp(map->dev_name, devname))) | |
1587 | continue; | |
1588 | ||
85f3b431 TV |
1589 | if (strcmp(map->supply, supply) == 0 && |
1590 | get_device(&map->regulator->dev)) { | |
163478da DT |
1591 | r = map->regulator; |
1592 | break; | |
85f3b431 | 1593 | } |
576ca436 | 1594 | } |
85f3b431 | 1595 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1596 | |
06217197 CK |
1597 | if (r) |
1598 | return r; | |
1599 | ||
1600 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1601 | if (r) |
1602 | return r; | |
1603 | ||
1604 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1605 | } |
1606 | ||
6261b06d BA |
1607 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1608 | { | |
1609 | struct regulator_dev *r; | |
1610 | struct device *dev = rdev->dev.parent; | |
1611 | int ret; | |
1612 | ||
1613 | /* No supply to resovle? */ | |
1614 | if (!rdev->supply_name) | |
1615 | return 0; | |
1616 | ||
1617 | /* Supply already resolved? */ | |
1618 | if (rdev->supply) | |
1619 | return 0; | |
1620 | ||
163478da DT |
1621 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1622 | if (IS_ERR(r)) { | |
1623 | ret = PTR_ERR(r); | |
1624 | ||
06423121 MB |
1625 | /* Did the lookup explicitly defer for us? */ |
1626 | if (ret == -EPROBE_DEFER) | |
1627 | return ret; | |
1628 | ||
9f7e25ed MB |
1629 | if (have_full_constraints()) { |
1630 | r = dummy_regulator_rdev; | |
85f3b431 | 1631 | get_device(&r->dev); |
9f7e25ed MB |
1632 | } else { |
1633 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1634 | rdev->supply_name, rdev->desc->name); | |
1635 | return -EPROBE_DEFER; | |
1636 | } | |
6261b06d BA |
1637 | } |
1638 | ||
66d228a2 JH |
1639 | /* |
1640 | * If the supply's parent device is not the same as the | |
1641 | * regulator's parent device, then ensure the parent device | |
1642 | * is bound before we resolve the supply, in case the parent | |
1643 | * device get probe deferred and unregisters the supply. | |
1644 | */ | |
1645 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1646 | if (!device_is_bound(r->dev.parent)) { | |
1647 | put_device(&r->dev); | |
1648 | return -EPROBE_DEFER; | |
1649 | } | |
1650 | } | |
1651 | ||
6261b06d BA |
1652 | /* Recursively resolve the supply of the supply */ |
1653 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1654 | if (ret < 0) { |
1655 | put_device(&r->dev); | |
6261b06d | 1656 | return ret; |
85f3b431 | 1657 | } |
6261b06d BA |
1658 | |
1659 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1660 | if (ret < 0) { |
1661 | put_device(&r->dev); | |
6261b06d | 1662 | return ret; |
85f3b431 | 1663 | } |
6261b06d BA |
1664 | |
1665 | /* Cascade always-on state to supply */ | |
95a293c7 | 1666 | if (_regulator_is_enabled(rdev)) { |
6261b06d | 1667 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1668 | if (ret < 0) { |
9f8df6ad | 1669 | _regulator_put(rdev->supply); |
8e5356a7 | 1670 | rdev->supply = NULL; |
6261b06d | 1671 | return ret; |
36a1f1b6 | 1672 | } |
6261b06d BA |
1673 | } |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
5ffbd136 | 1678 | /* Internal regulator request function */ |
a8bd42a9 DT |
1679 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1680 | enum regulator_get_type get_type) | |
414c70cb LG |
1681 | { |
1682 | struct regulator_dev *rdev; | |
7d245afa | 1683 | struct regulator *regulator; |
a4d7641f | 1684 | const char *devname = dev ? dev_name(dev) : "deviceless"; |
317b5684 | 1685 | int ret; |
414c70cb | 1686 | |
a8bd42a9 DT |
1687 | if (get_type >= MAX_GET_TYPE) { |
1688 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1689 | return ERR_PTR(-EINVAL); | |
1690 | } | |
1691 | ||
414c70cb | 1692 | if (id == NULL) { |
5da84fd9 | 1693 | pr_err("get() with no identifier\n"); |
043c998f | 1694 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1695 | } |
1696 | ||
163478da | 1697 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1698 | if (IS_ERR(rdev)) { |
1699 | ret = PTR_ERR(rdev); | |
1e4b545c | 1700 | |
a4d7641f DT |
1701 | /* |
1702 | * If regulator_dev_lookup() fails with error other | |
1703 | * than -ENODEV our job here is done, we simply return it. | |
1704 | */ | |
1705 | if (ret != -ENODEV) | |
1706 | return ERR_PTR(ret); | |
34abbd68 | 1707 | |
a4d7641f DT |
1708 | if (!have_full_constraints()) { |
1709 | dev_warn(dev, | |
1710 | "incomplete constraints, dummy supplies not allowed\n"); | |
1711 | return ERR_PTR(-ENODEV); | |
1712 | } | |
4ddfebd3 | 1713 | |
a4d7641f DT |
1714 | switch (get_type) { |
1715 | case NORMAL_GET: | |
1716 | /* | |
1717 | * Assume that a regulator is physically present and | |
1718 | * enabled, even if it isn't hooked up, and just | |
1719 | * provide a dummy. | |
1720 | */ | |
1721 | dev_warn(dev, | |
1722 | "%s supply %s not found, using dummy regulator\n", | |
1723 | devname, id); | |
1724 | rdev = dummy_regulator_rdev; | |
1725 | get_device(&rdev->dev); | |
1726 | break; | |
34abbd68 | 1727 | |
a4d7641f DT |
1728 | case EXCLUSIVE_GET: |
1729 | dev_warn(dev, | |
1730 | "dummy supplies not allowed for exclusive requests\n"); | |
1731 | /* fall through */ | |
34abbd68 | 1732 | |
a4d7641f DT |
1733 | default: |
1734 | return ERR_PTR(-ENODEV); | |
1735 | } | |
34abbd68 | 1736 | } |
34abbd68 | 1737 | |
5ffbd136 MB |
1738 | if (rdev->exclusive) { |
1739 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1740 | put_device(&rdev->dev); |
1741 | return regulator; | |
5ffbd136 MB |
1742 | } |
1743 | ||
a8bd42a9 | 1744 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1745 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1746 | put_device(&rdev->dev); |
1747 | return regulator; | |
5ffbd136 MB |
1748 | } |
1749 | ||
79d6f049 DO |
1750 | mutex_lock(®ulator_list_mutex); |
1751 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1752 | mutex_unlock(®ulator_list_mutex); | |
1753 | ||
1754 | if (ret != 0) { | |
1755 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1756 | put_device(&rdev->dev); | |
1757 | return regulator; | |
1758 | } | |
1759 | ||
6261b06d BA |
1760 | ret = regulator_resolve_supply(rdev); |
1761 | if (ret < 0) { | |
1762 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1763 | put_device(&rdev->dev); |
1764 | return regulator; | |
6261b06d BA |
1765 | } |
1766 | ||
85f3b431 | 1767 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1768 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1769 | put_device(&rdev->dev); |
1770 | return regulator; | |
1771 | } | |
a5766f11 | 1772 | |
414c70cb LG |
1773 | regulator = create_regulator(rdev, dev, id); |
1774 | if (regulator == NULL) { | |
1775 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1776 | put_device(&rdev->dev); |
414c70cb | 1777 | module_put(rdev->owner); |
85f3b431 | 1778 | return regulator; |
414c70cb LG |
1779 | } |
1780 | ||
5ffbd136 | 1781 | rdev->open_count++; |
a8bd42a9 | 1782 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1783 | rdev->exclusive = 1; |
1784 | ||
1785 | ret = _regulator_is_enabled(rdev); | |
1786 | if (ret > 0) | |
1787 | rdev->use_count = 1; | |
1788 | else | |
1789 | rdev->use_count = 0; | |
1790 | } | |
1791 | ||
ed1ae2dd | 1792 | device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
1793 | ||
414c70cb LG |
1794 | return regulator; |
1795 | } | |
5ffbd136 MB |
1796 | |
1797 | /** | |
1798 | * regulator_get - lookup and obtain a reference to a regulator. | |
1799 | * @dev: device for regulator "consumer" | |
1800 | * @id: Supply name or regulator ID. | |
1801 | * | |
1802 | * Returns a struct regulator corresponding to the regulator producer, | |
1803 | * or IS_ERR() condition containing errno. | |
1804 | * | |
1805 | * Use of supply names configured via regulator_set_device_supply() is | |
1806 | * strongly encouraged. It is recommended that the supply name used | |
1807 | * should match the name used for the supply and/or the relevant | |
1808 | * device pins in the datasheet. | |
1809 | */ | |
1810 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1811 | { | |
a8bd42a9 | 1812 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 1813 | } |
414c70cb LG |
1814 | EXPORT_SYMBOL_GPL(regulator_get); |
1815 | ||
5ffbd136 MB |
1816 | /** |
1817 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1818 | * @dev: device for regulator "consumer" | |
1819 | * @id: Supply name or regulator ID. | |
1820 | * | |
1821 | * Returns a struct regulator corresponding to the regulator producer, | |
1822 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1823 | * unable to obtain this regulator while this reference is held and the |
1824 | * use count for the regulator will be initialised to reflect the current | |
1825 | * state of the regulator. | |
5ffbd136 MB |
1826 | * |
1827 | * This is intended for use by consumers which cannot tolerate shared | |
1828 | * use of the regulator such as those which need to force the | |
1829 | * regulator off for correct operation of the hardware they are | |
1830 | * controlling. | |
1831 | * | |
1832 | * Use of supply names configured via regulator_set_device_supply() is | |
1833 | * strongly encouraged. It is recommended that the supply name used | |
1834 | * should match the name used for the supply and/or the relevant | |
1835 | * device pins in the datasheet. | |
1836 | */ | |
1837 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1838 | { | |
a8bd42a9 | 1839 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
1840 | } |
1841 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1842 | ||
de1dd9fd MB |
1843 | /** |
1844 | * regulator_get_optional - obtain optional access to a regulator. | |
1845 | * @dev: device for regulator "consumer" | |
1846 | * @id: Supply name or regulator ID. | |
1847 | * | |
1848 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1849 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1850 | * |
1851 | * This is intended for use by consumers for devices which can have | |
1852 | * some supplies unconnected in normal use, such as some MMC devices. | |
1853 | * It can allow the regulator core to provide stub supplies for other | |
1854 | * supplies requested using normal regulator_get() calls without | |
1855 | * disrupting the operation of drivers that can handle absent | |
1856 | * supplies. | |
1857 | * | |
1858 | * Use of supply names configured via regulator_set_device_supply() is | |
1859 | * strongly encouraged. It is recommended that the supply name used | |
1860 | * should match the name used for the supply and/or the relevant | |
1861 | * device pins in the datasheet. | |
1862 | */ | |
1863 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1864 | { | |
a8bd42a9 | 1865 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
1866 | } |
1867 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1868 | ||
83b0302d | 1869 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1870 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1871 | { |
1872 | struct regulator_dev *rdev; | |
1873 | ||
93576842 | 1874 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
1875 | return; |
1876 | ||
70cfef26 KK |
1877 | lockdep_assert_held_once(®ulator_list_mutex); |
1878 | ||
414c70cb LG |
1879 | rdev = regulator->rdev; |
1880 | ||
5de70519 | 1881 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1882 | |
ed1ae2dd | 1883 | if (regulator->dev) { |
1884 | int count = 0; | |
1885 | struct regulator *r; | |
1886 | ||
1887 | list_for_each_entry(r, &rdev->consumer_list, list) | |
1888 | if (r->dev == regulator->dev) | |
1889 | count++; | |
1890 | ||
1891 | if (count == 1) | |
1892 | device_link_remove(regulator->dev, &rdev->dev); | |
1893 | ||
1894 | /* remove any sysfs entries */ | |
414c70cb | 1895 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 1896 | } |
1897 | ||
66cf9a7e | 1898 | regulator_lock(rdev); |
414c70cb | 1899 | list_del(®ulator->list); |
414c70cb | 1900 | |
5ffbd136 MB |
1901 | rdev->open_count--; |
1902 | rdev->exclusive = 0; | |
85f3b431 | 1903 | put_device(&rdev->dev); |
66cf9a7e | 1904 | regulator_unlock(rdev); |
5ffbd136 | 1905 | |
0630b614 | 1906 | kfree_const(regulator->supply_name); |
1768514e MB |
1907 | kfree(regulator); |
1908 | ||
414c70cb | 1909 | module_put(rdev->owner); |
23ff2f0f CK |
1910 | } |
1911 | ||
1912 | /** | |
1913 | * regulator_put - "free" the regulator source | |
1914 | * @regulator: regulator source | |
1915 | * | |
1916 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1917 | * regulator source are balanced by regulator_disable calls prior to calling | |
1918 | * this function. | |
1919 | */ | |
1920 | void regulator_put(struct regulator *regulator) | |
1921 | { | |
1922 | mutex_lock(®ulator_list_mutex); | |
1923 | _regulator_put(regulator); | |
414c70cb LG |
1924 | mutex_unlock(®ulator_list_mutex); |
1925 | } | |
1926 | EXPORT_SYMBOL_GPL(regulator_put); | |
1927 | ||
a06ccd9c CK |
1928 | /** |
1929 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1930 | * | |
1931 | * @dev: device that will be given as the regulator "consumer" | |
1932 | * @id: Supply name or regulator ID | |
1933 | * @alias_dev: device that should be used to lookup the supply | |
1934 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1935 | * supply | |
1936 | * | |
1937 | * All lookups for id on dev will instead be conducted for alias_id on | |
1938 | * alias_dev. | |
1939 | */ | |
1940 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1941 | struct device *alias_dev, | |
1942 | const char *alias_id) | |
1943 | { | |
1944 | struct regulator_supply_alias *map; | |
1945 | ||
1946 | map = regulator_find_supply_alias(dev, id); | |
1947 | if (map) | |
1948 | return -EEXIST; | |
1949 | ||
1950 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1951 | if (!map) | |
1952 | return -ENOMEM; | |
1953 | ||
1954 | map->src_dev = dev; | |
1955 | map->src_supply = id; | |
1956 | map->alias_dev = alias_dev; | |
1957 | map->alias_supply = alias_id; | |
1958 | ||
1959 | list_add(&map->list, ®ulator_supply_alias_list); | |
1960 | ||
1961 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1962 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1963 | ||
1964 | return 0; | |
1965 | } | |
1966 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1967 | ||
1968 | /** | |
1969 | * regulator_unregister_supply_alias - Remove device alias | |
1970 | * | |
1971 | * @dev: device that will be given as the regulator "consumer" | |
1972 | * @id: Supply name or regulator ID | |
1973 | * | |
1974 | * Remove a lookup alias if one exists for id on dev. | |
1975 | */ | |
1976 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1977 | { | |
1978 | struct regulator_supply_alias *map; | |
1979 | ||
1980 | map = regulator_find_supply_alias(dev, id); | |
1981 | if (map) { | |
1982 | list_del(&map->list); | |
1983 | kfree(map); | |
1984 | } | |
1985 | } | |
1986 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1987 | ||
1988 | /** | |
1989 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1990 | * | |
1991 | * @dev: device that will be given as the regulator "consumer" | |
1992 | * @id: List of supply names or regulator IDs | |
1993 | * @alias_dev: device that should be used to lookup the supply | |
1994 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1995 | * lookup the supply | |
1996 | * @num_id: Number of aliases to register | |
1997 | * | |
1998 | * @return 0 on success, an errno on failure. | |
1999 | * | |
2000 | * This helper function allows drivers to register several supply | |
2001 | * aliases in one operation. If any of the aliases cannot be | |
2002 | * registered any aliases that were registered will be removed | |
2003 | * before returning to the caller. | |
2004 | */ | |
9f8c0fe9 LJ |
2005 | int regulator_bulk_register_supply_alias(struct device *dev, |
2006 | const char *const *id, | |
a06ccd9c | 2007 | struct device *alias_dev, |
9f8c0fe9 | 2008 | const char *const *alias_id, |
a06ccd9c CK |
2009 | int num_id) |
2010 | { | |
2011 | int i; | |
2012 | int ret; | |
2013 | ||
2014 | for (i = 0; i < num_id; ++i) { | |
2015 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2016 | alias_id[i]); | |
2017 | if (ret < 0) | |
2018 | goto err; | |
2019 | } | |
2020 | ||
2021 | return 0; | |
2022 | ||
2023 | err: | |
2024 | dev_err(dev, | |
2025 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2026 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2027 | ||
2028 | while (--i >= 0) | |
2029 | regulator_unregister_supply_alias(dev, id[i]); | |
2030 | ||
2031 | return ret; | |
2032 | } | |
2033 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2034 | ||
2035 | /** | |
2036 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2037 | * | |
2038 | * @dev: device that will be given as the regulator "consumer" | |
2039 | * @id: List of supply names or regulator IDs | |
2040 | * @num_id: Number of aliases to unregister | |
2041 | * | |
2042 | * This helper function allows drivers to unregister several supply | |
2043 | * aliases in one operation. | |
2044 | */ | |
2045 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2046 | const char *const *id, |
a06ccd9c CK |
2047 | int num_id) |
2048 | { | |
2049 | int i; | |
2050 | ||
2051 | for (i = 0; i < num_id; ++i) | |
2052 | regulator_unregister_supply_alias(dev, id[i]); | |
2053 | } | |
2054 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2055 | ||
2056 | ||
f19b00da KM |
2057 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2058 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2059 | const struct regulator_config *config) | |
2060 | { | |
2061 | struct regulator_enable_gpio *pin; | |
778b28b4 | 2062 | struct gpio_desc *gpiod; |
f19b00da KM |
2063 | int ret; |
2064 | ||
e45e290a LW |
2065 | if (config->ena_gpiod) |
2066 | gpiod = config->ena_gpiod; | |
2067 | else | |
2068 | gpiod = gpio_to_desc(config->ena_gpio); | |
778b28b4 | 2069 | |
f19b00da | 2070 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2071 | if (pin->gpiod == gpiod) { |
f19b00da KM |
2072 | rdev_dbg(rdev, "GPIO %d is already used\n", |
2073 | config->ena_gpio); | |
2074 | goto update_ena_gpio_to_rdev; | |
2075 | } | |
2076 | } | |
2077 | ||
e45e290a LW |
2078 | if (!config->ena_gpiod) { |
2079 | ret = gpio_request_one(config->ena_gpio, | |
2080 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
2081 | rdev_get_name(rdev)); | |
2082 | if (ret) | |
2083 | return ret; | |
2084 | } | |
f19b00da KM |
2085 | |
2086 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
2087 | if (pin == NULL) { | |
e45e290a LW |
2088 | if (!config->ena_gpiod) |
2089 | gpio_free(config->ena_gpio); | |
f19b00da KM |
2090 | return -ENOMEM; |
2091 | } | |
2092 | ||
778b28b4 | 2093 | pin->gpiod = gpiod; |
f19b00da KM |
2094 | pin->ena_gpio_invert = config->ena_gpio_invert; |
2095 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
2096 | ||
2097 | update_ena_gpio_to_rdev: | |
2098 | pin->request_count++; | |
2099 | rdev->ena_pin = pin; | |
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2104 | { | |
2105 | struct regulator_enable_gpio *pin, *n; | |
2106 | ||
2107 | if (!rdev->ena_pin) | |
2108 | return; | |
2109 | ||
2110 | /* Free the GPIO only in case of no use */ | |
2111 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 2112 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
2113 | if (pin->request_count <= 1) { |
2114 | pin->request_count = 0; | |
778b28b4 | 2115 | gpiod_put(pin->gpiod); |
f19b00da KM |
2116 | list_del(&pin->list); |
2117 | kfree(pin); | |
60a2362f SWK |
2118 | rdev->ena_pin = NULL; |
2119 | return; | |
f19b00da KM |
2120 | } else { |
2121 | pin->request_count--; | |
2122 | } | |
2123 | } | |
2124 | } | |
2125 | } | |
2126 | ||
967cfb18 | 2127 | /** |
31d6eebf RD |
2128 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2129 | * @rdev: regulator_dev structure | |
2130 | * @enable: enable GPIO at initial use? | |
2131 | * | |
967cfb18 KM |
2132 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2133 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2134 | */ | |
2135 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2136 | { | |
2137 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2138 | ||
2139 | if (!pin) | |
2140 | return -EINVAL; | |
2141 | ||
2142 | if (enable) { | |
2143 | /* Enable GPIO at initial use */ | |
2144 | if (pin->enable_count == 0) | |
778b28b4 RK |
2145 | gpiod_set_value_cansleep(pin->gpiod, |
2146 | !pin->ena_gpio_invert); | |
967cfb18 KM |
2147 | |
2148 | pin->enable_count++; | |
2149 | } else { | |
2150 | if (pin->enable_count > 1) { | |
2151 | pin->enable_count--; | |
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | /* Disable GPIO if not used */ | |
2156 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
2157 | gpiod_set_value_cansleep(pin->gpiod, |
2158 | pin->ena_gpio_invert); | |
967cfb18 KM |
2159 | pin->enable_count = 0; |
2160 | } | |
2161 | } | |
2162 | ||
2163 | return 0; | |
2164 | } | |
2165 | ||
79fd1141 GX |
2166 | /** |
2167 | * _regulator_enable_delay - a delay helper function | |
2168 | * @delay: time to delay in microseconds | |
2169 | * | |
2170 | * Delay for the requested amount of time as per the guidelines in: | |
2171 | * | |
2172 | * Documentation/timers/timers-howto.txt | |
2173 | * | |
2174 | * The assumption here is that regulators will never be enabled in | |
2175 | * atomic context and therefore sleeping functions can be used. | |
2176 | */ | |
2177 | static void _regulator_enable_delay(unsigned int delay) | |
2178 | { | |
2179 | unsigned int ms = delay / 1000; | |
2180 | unsigned int us = delay % 1000; | |
2181 | ||
2182 | if (ms > 0) { | |
2183 | /* | |
2184 | * For small enough values, handle super-millisecond | |
2185 | * delays in the usleep_range() call below. | |
2186 | */ | |
2187 | if (ms < 20) | |
2188 | us += ms * 1000; | |
2189 | else | |
2190 | msleep(ms); | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * Give the scheduler some room to coalesce with any other | |
2195 | * wakeup sources. For delays shorter than 10 us, don't even | |
2196 | * bother setting up high-resolution timers and just busy- | |
2197 | * loop. | |
2198 | */ | |
2199 | if (us >= 10) | |
2200 | usleep_range(us, us + 100); | |
2201 | else | |
2202 | udelay(us); | |
2203 | } | |
2204 | ||
5c5659d0 MB |
2205 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2206 | { | |
2207 | int ret, delay; | |
2208 | ||
2209 | /* Query before enabling in case configuration dependent. */ | |
2210 | ret = _regulator_get_enable_time(rdev); | |
2211 | if (ret >= 0) { | |
2212 | delay = ret; | |
2213 | } else { | |
2214 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2215 | delay = 0; | |
2216 | } | |
2217 | ||
2218 | trace_regulator_enable(rdev_get_name(rdev)); | |
2219 | ||
871f5650 GX |
2220 | if (rdev->desc->off_on_delay) { |
2221 | /* if needed, keep a distance of off_on_delay from last time | |
2222 | * this regulator was disabled. | |
2223 | */ | |
2224 | unsigned long start_jiffy = jiffies; | |
2225 | unsigned long intended, max_delay, remaining; | |
2226 | ||
2227 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2228 | intended = rdev->last_off_jiffy + max_delay; | |
2229 | ||
2230 | if (time_before(start_jiffy, intended)) { | |
2231 | /* calc remaining jiffies to deal with one-time | |
2232 | * timer wrapping. | |
2233 | * in case of multiple timer wrapping, either it can be | |
2234 | * detected by out-of-range remaining, or it cannot be | |
2235 | * detected and we gets a panelty of | |
2236 | * _regulator_enable_delay(). | |
2237 | */ | |
2238 | remaining = intended - start_jiffy; | |
2239 | if (remaining <= max_delay) | |
2240 | _regulator_enable_delay( | |
2241 | jiffies_to_usecs(remaining)); | |
2242 | } | |
2243 | } | |
2244 | ||
967cfb18 | 2245 | if (rdev->ena_pin) { |
29d62ec5 DA |
2246 | if (!rdev->ena_gpio_state) { |
2247 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2248 | if (ret < 0) | |
2249 | return ret; | |
2250 | rdev->ena_gpio_state = 1; | |
2251 | } | |
65f73508 | 2252 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2253 | ret = rdev->desc->ops->enable(rdev); |
2254 | if (ret < 0) | |
2255 | return ret; | |
2256 | } else { | |
2257 | return -EINVAL; | |
2258 | } | |
2259 | ||
2260 | /* Allow the regulator to ramp; it would be useful to extend | |
2261 | * this for bulk operations so that the regulators can ramp | |
2262 | * together. */ | |
2263 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2264 | ||
79fd1141 | 2265 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2266 | |
2267 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2268 | ||
2269 | return 0; | |
2270 | } | |
2271 | ||
414c70cb LG |
2272 | /* locks held by regulator_enable() */ |
2273 | static int _regulator_enable(struct regulator_dev *rdev) | |
2274 | { | |
5c5659d0 | 2275 | int ret; |
414c70cb | 2276 | |
70cfef26 KK |
2277 | lockdep_assert_held_once(&rdev->mutex); |
2278 | ||
414c70cb | 2279 | /* check voltage and requested load before enabling */ |
8a34e979 | 2280 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
9a2372fa | 2281 | drms_uA_update(rdev); |
414c70cb | 2282 | |
9a2372fa MB |
2283 | if (rdev->use_count == 0) { |
2284 | /* The regulator may on if it's not switchable or left on */ | |
2285 | ret = _regulator_is_enabled(rdev); | |
2286 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 WP |
2287 | if (!regulator_ops_is_valid(rdev, |
2288 | REGULATOR_CHANGE_STATUS)) | |
9a2372fa MB |
2289 | return -EPERM; |
2290 | ||
5c5659d0 | 2291 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
2292 | if (ret < 0) |
2293 | return ret; | |
2294 | ||
264b88c9 HG |
2295 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2296 | NULL); | |
a7433cff | 2297 | } else if (ret < 0) { |
5da84fd9 | 2298 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
2299 | return ret; |
2300 | } | |
a7433cff | 2301 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2302 | } |
2303 | ||
9a2372fa MB |
2304 | rdev->use_count++; |
2305 | ||
2306 | return 0; | |
414c70cb LG |
2307 | } |
2308 | ||
2309 | /** | |
2310 | * regulator_enable - enable regulator output | |
2311 | * @regulator: regulator source | |
2312 | * | |
cf7bbcdf MB |
2313 | * Request that the regulator be enabled with the regulator output at |
2314 | * the predefined voltage or current value. Calls to regulator_enable() | |
2315 | * must be balanced with calls to regulator_disable(). | |
2316 | * | |
414c70cb | 2317 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2318 | * hardwired in the regulator. |
414c70cb LG |
2319 | */ |
2320 | int regulator_enable(struct regulator *regulator) | |
2321 | { | |
412aec61 DB |
2322 | struct regulator_dev *rdev = regulator->rdev; |
2323 | int ret = 0; | |
414c70cb | 2324 | |
6492bc1b MB |
2325 | if (regulator->always_on) |
2326 | return 0; | |
2327 | ||
3801b86a MB |
2328 | if (rdev->supply) { |
2329 | ret = regulator_enable(rdev->supply); | |
2330 | if (ret != 0) | |
2331 | return ret; | |
2332 | } | |
2333 | ||
9243a195 MP |
2334 | regulator_lock_dependent(rdev); |
2335 | /* balance only if there are regulators coupled */ | |
2336 | if (rdev->coupling_desc.n_coupled > 1) { | |
2337 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2338 | if (ret != 0) | |
2339 | goto unlock; | |
2340 | } | |
cd94b505 | 2341 | ret = _regulator_enable(rdev); |
9243a195 MP |
2342 | unlock: |
2343 | regulator_unlock_dependent(rdev); | |
3801b86a | 2344 | |
d1685e4e | 2345 | if (ret != 0 && rdev->supply) |
3801b86a MB |
2346 | regulator_disable(rdev->supply); |
2347 | ||
414c70cb LG |
2348 | return ret; |
2349 | } | |
2350 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2351 | ||
5c5659d0 MB |
2352 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2353 | { | |
2354 | int ret; | |
2355 | ||
2356 | trace_regulator_disable(rdev_get_name(rdev)); | |
2357 | ||
967cfb18 | 2358 | if (rdev->ena_pin) { |
29d62ec5 DA |
2359 | if (rdev->ena_gpio_state) { |
2360 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2361 | if (ret < 0) | |
2362 | return ret; | |
2363 | rdev->ena_gpio_state = 0; | |
2364 | } | |
5c5659d0 MB |
2365 | |
2366 | } else if (rdev->desc->ops->disable) { | |
2367 | ret = rdev->desc->ops->disable(rdev); | |
2368 | if (ret != 0) | |
2369 | return ret; | |
2370 | } | |
2371 | ||
871f5650 GX |
2372 | /* cares about last_off_jiffy only if off_on_delay is required by |
2373 | * device. | |
2374 | */ | |
2375 | if (rdev->desc->off_on_delay) | |
2376 | rdev->last_off_jiffy = jiffies; | |
2377 | ||
5c5659d0 MB |
2378 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2379 | ||
5c5659d0 MB |
2380 | return 0; |
2381 | } | |
2382 | ||
414c70cb | 2383 | /* locks held by regulator_disable() */ |
3801b86a | 2384 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2385 | { |
2386 | int ret = 0; | |
2387 | ||
70cfef26 KK |
2388 | lockdep_assert_held_once(&rdev->mutex); |
2389 | ||
cd94b505 | 2390 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2391 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2392 | return -EIO; |
2393 | ||
414c70cb | 2394 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2395 | if (rdev->use_count == 1 && |
2396 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2397 | |
2398 | /* we are last user */ | |
8a34e979 | 2399 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2400 | ret = _notifier_call_chain(rdev, |
2401 | REGULATOR_EVENT_PRE_DISABLE, | |
2402 | NULL); | |
2403 | if (ret & NOTIFY_STOP_MASK) | |
2404 | return -EINVAL; | |
2405 | ||
5c5659d0 | 2406 | ret = _regulator_do_disable(rdev); |
414c70cb | 2407 | if (ret < 0) { |
5da84fd9 | 2408 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2409 | _notifier_call_chain(rdev, |
2410 | REGULATOR_EVENT_ABORT_DISABLE, | |
2411 | NULL); | |
414c70cb LG |
2412 | return ret; |
2413 | } | |
66fda75f MP |
2414 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2415 | NULL); | |
414c70cb LG |
2416 | } |
2417 | ||
414c70cb LG |
2418 | rdev->use_count = 0; |
2419 | } else if (rdev->use_count > 1) { | |
8a34e979 | 2420 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
414c70cb LG |
2421 | drms_uA_update(rdev); |
2422 | ||
2423 | rdev->use_count--; | |
2424 | } | |
3801b86a | 2425 | |
414c70cb LG |
2426 | return ret; |
2427 | } | |
2428 | ||
2429 | /** | |
2430 | * regulator_disable - disable regulator output | |
2431 | * @regulator: regulator source | |
2432 | * | |
cf7bbcdf MB |
2433 | * Disable the regulator output voltage or current. Calls to |
2434 | * regulator_enable() must be balanced with calls to | |
2435 | * regulator_disable(). | |
69279fb9 | 2436 | * |
414c70cb | 2437 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2438 | * devices have it enabled, the regulator device supports disabling and |
2439 | * machine constraints permit this operation. | |
414c70cb LG |
2440 | */ |
2441 | int regulator_disable(struct regulator *regulator) | |
2442 | { | |
412aec61 DB |
2443 | struct regulator_dev *rdev = regulator->rdev; |
2444 | int ret = 0; | |
414c70cb | 2445 | |
6492bc1b MB |
2446 | if (regulator->always_on) |
2447 | return 0; | |
2448 | ||
9243a195 | 2449 | regulator_lock_dependent(rdev); |
3801b86a | 2450 | ret = _regulator_disable(rdev); |
9243a195 MP |
2451 | if (rdev->coupling_desc.n_coupled > 1) |
2452 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2453 | regulator_unlock_dependent(rdev); | |
8cbf811d | 2454 | |
3801b86a MB |
2455 | if (ret == 0 && rdev->supply) |
2456 | regulator_disable(rdev->supply); | |
8cbf811d | 2457 | |
414c70cb LG |
2458 | return ret; |
2459 | } | |
2460 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2461 | ||
2462 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2463 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2464 | { |
2465 | int ret = 0; | |
2466 | ||
70cfef26 KK |
2467 | lockdep_assert_held_once(&rdev->mutex); |
2468 | ||
a1c8a551 RF |
2469 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2470 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2471 | if (ret & NOTIFY_STOP_MASK) | |
2472 | return -EINVAL; | |
2473 | ||
66fda75f MP |
2474 | ret = _regulator_do_disable(rdev); |
2475 | if (ret < 0) { | |
2476 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2477 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2478 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2479 | return ret; |
414c70cb LG |
2480 | } |
2481 | ||
66fda75f MP |
2482 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2483 | REGULATOR_EVENT_DISABLE, NULL); | |
2484 | ||
2485 | return 0; | |
414c70cb LG |
2486 | } |
2487 | ||
2488 | /** | |
2489 | * regulator_force_disable - force disable regulator output | |
2490 | * @regulator: regulator source | |
2491 | * | |
2492 | * Forcibly disable the regulator output voltage or current. | |
2493 | * NOTE: this *will* disable the regulator output even if other consumer | |
2494 | * devices have it enabled. This should be used for situations when device | |
2495 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2496 | */ | |
2497 | int regulator_force_disable(struct regulator *regulator) | |
2498 | { | |
82d15839 | 2499 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2500 | int ret; |
2501 | ||
9243a195 | 2502 | regulator_lock_dependent(rdev); |
414c70cb | 2503 | regulator->uA_load = 0; |
3801b86a | 2504 | ret = _regulator_force_disable(regulator->rdev); |
9243a195 MP |
2505 | if (rdev->coupling_desc.n_coupled > 1) |
2506 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2507 | regulator_unlock_dependent(rdev); | |
8cbf811d | 2508 | |
3801b86a MB |
2509 | if (rdev->supply) |
2510 | while (rdev->open_count--) | |
2511 | regulator_disable(rdev->supply); | |
8cbf811d | 2512 | |
414c70cb LG |
2513 | return ret; |
2514 | } | |
2515 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2516 | ||
da07ecd9 MB |
2517 | static void regulator_disable_work(struct work_struct *work) |
2518 | { | |
2519 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2520 | disable_work.work); | |
2521 | int count, i, ret; | |
2522 | ||
66cf9a7e | 2523 | regulator_lock(rdev); |
da07ecd9 MB |
2524 | |
2525 | BUG_ON(!rdev->deferred_disables); | |
2526 | ||
2527 | count = rdev->deferred_disables; | |
2528 | rdev->deferred_disables = 0; | |
2529 | ||
c9ccaa0c TR |
2530 | /* |
2531 | * Workqueue functions queue the new work instance while the previous | |
2532 | * work instance is being processed. Cancel the queued work instance | |
2533 | * as the work instance under processing does the job of the queued | |
2534 | * work instance. | |
2535 | */ | |
2536 | cancel_delayed_work(&rdev->disable_work); | |
2537 | ||
da07ecd9 MB |
2538 | for (i = 0; i < count; i++) { |
2539 | ret = _regulator_disable(rdev); | |
2540 | if (ret != 0) | |
2541 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2542 | } | |
2543 | ||
66cf9a7e | 2544 | regulator_unlock(rdev); |
da07ecd9 MB |
2545 | |
2546 | if (rdev->supply) { | |
2547 | for (i = 0; i < count; i++) { | |
2548 | ret = regulator_disable(rdev->supply); | |
2549 | if (ret != 0) { | |
2550 | rdev_err(rdev, | |
2551 | "Supply disable failed: %d\n", ret); | |
2552 | } | |
2553 | } | |
2554 | } | |
2555 | } | |
2556 | ||
2557 | /** | |
2558 | * regulator_disable_deferred - disable regulator output with delay | |
2559 | * @regulator: regulator source | |
2560 | * @ms: miliseconds until the regulator is disabled | |
2561 | * | |
2562 | * Execute regulator_disable() on the regulator after a delay. This | |
2563 | * is intended for use with devices that require some time to quiesce. | |
2564 | * | |
2565 | * NOTE: this will only disable the regulator output if no other consumer | |
2566 | * devices have it enabled, the regulator device supports disabling and | |
2567 | * machine constraints permit this operation. | |
2568 | */ | |
2569 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2570 | { | |
2571 | struct regulator_dev *rdev = regulator->rdev; | |
2572 | ||
6492bc1b MB |
2573 | if (regulator->always_on) |
2574 | return 0; | |
2575 | ||
2b5a24a0 MB |
2576 | if (!ms) |
2577 | return regulator_disable(regulator); | |
2578 | ||
66cf9a7e | 2579 | regulator_lock(rdev); |
da07ecd9 | 2580 | rdev->deferred_disables++; |
c9ccaa0c TR |
2581 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2582 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2583 | regulator_unlock(rdev); |
da07ecd9 | 2584 | |
70dc6daf | 2585 | return 0; |
da07ecd9 MB |
2586 | } |
2587 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2588 | ||
414c70cb LG |
2589 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2590 | { | |
65f73508 | 2591 | /* A GPIO control always takes precedence */ |
7b74d149 | 2592 | if (rdev->ena_pin) |
65f73508 MB |
2593 | return rdev->ena_gpio_state; |
2594 | ||
9a7f6a4c | 2595 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2596 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2597 | return 1; |
414c70cb | 2598 | |
9332546f | 2599 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2600 | } |
2601 | ||
3d67fe95 MP |
2602 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2603 | unsigned selector, int lock) | |
3a40cfc3 | 2604 | { |
3a40cfc3 SH |
2605 | const struct regulator_ops *ops = rdev->desc->ops; |
2606 | int ret; | |
2607 | ||
2608 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2609 | return rdev->desc->fixed_uV; | |
2610 | ||
2611 | if (ops->list_voltage) { | |
2612 | if (selector >= rdev->desc->n_voltages) | |
2613 | return -EINVAL; | |
2614 | if (lock) | |
66cf9a7e | 2615 | regulator_lock(rdev); |
3a40cfc3 SH |
2616 | ret = ops->list_voltage(rdev, selector); |
2617 | if (lock) | |
66cf9a7e | 2618 | regulator_unlock(rdev); |
fd086045 | 2619 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2620 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2621 | selector, lock); | |
3a40cfc3 SH |
2622 | } else { |
2623 | return -EINVAL; | |
2624 | } | |
2625 | ||
2626 | if (ret > 0) { | |
2627 | if (ret < rdev->constraints->min_uV) | |
2628 | ret = 0; | |
2629 | else if (ret > rdev->constraints->max_uV) | |
2630 | ret = 0; | |
2631 | } | |
2632 | ||
2633 | return ret; | |
2634 | } | |
2635 | ||
414c70cb LG |
2636 | /** |
2637 | * regulator_is_enabled - is the regulator output enabled | |
2638 | * @regulator: regulator source | |
2639 | * | |
412aec61 DB |
2640 | * Returns positive if the regulator driver backing the source/client |
2641 | * has requested that the device be enabled, zero if it hasn't, else a | |
2642 | * negative errno code. | |
2643 | * | |
2644 | * Note that the device backing this regulator handle can have multiple | |
2645 | * users, so it might be enabled even if regulator_enable() was never | |
2646 | * called for this particular source. | |
414c70cb LG |
2647 | */ |
2648 | int regulator_is_enabled(struct regulator *regulator) | |
2649 | { | |
9332546f MB |
2650 | int ret; |
2651 | ||
6492bc1b MB |
2652 | if (regulator->always_on) |
2653 | return 1; | |
2654 | ||
9243a195 | 2655 | regulator_lock_dependent(regulator->rdev); |
9332546f | 2656 | ret = _regulator_is_enabled(regulator->rdev); |
9243a195 | 2657 | regulator_unlock_dependent(regulator->rdev); |
9332546f MB |
2658 | |
2659 | return ret; | |
414c70cb LG |
2660 | } |
2661 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2662 | ||
4367cfdc DB |
2663 | /** |
2664 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2665 | * @regulator: regulator source | |
2666 | * | |
2667 | * Returns number of selectors, or negative errno. Selectors are | |
2668 | * numbered starting at zero, and typically correspond to bitfields | |
2669 | * in hardware registers. | |
2670 | */ | |
2671 | int regulator_count_voltages(struct regulator *regulator) | |
2672 | { | |
2673 | struct regulator_dev *rdev = regulator->rdev; | |
2674 | ||
26988efe JMC |
2675 | if (rdev->desc->n_voltages) |
2676 | return rdev->desc->n_voltages; | |
2677 | ||
fd086045 | 2678 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
2679 | return -EINVAL; |
2680 | ||
2681 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2682 | } |
2683 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2684 | ||
2685 | /** | |
2686 | * regulator_list_voltage - enumerate supported voltages | |
2687 | * @regulator: regulator source | |
2688 | * @selector: identify voltage to list | |
2689 | * Context: can sleep | |
2690 | * | |
2691 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2692 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2693 | * negative errno. |
2694 | */ | |
2695 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2696 | { | |
3d67fe95 | 2697 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
2698 | } |
2699 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2700 | ||
04eca28c TT |
2701 | /** |
2702 | * regulator_get_regmap - get the regulator's register map | |
2703 | * @regulator: regulator source | |
2704 | * | |
2705 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2706 | * if the regulator doesn't use regmap. | |
2707 | */ | |
2708 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2709 | { | |
2710 | struct regmap *map = regulator->rdev->regmap; | |
2711 | ||
2712 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2713 | } | |
2714 | ||
2715 | /** | |
2716 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2717 | * @regulator: regulator source | |
2718 | * @vsel_reg: voltage selector register, output parameter | |
2719 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2720 | * | |
2721 | * Returns the hardware register offset and bitmask used for setting the | |
2722 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2723 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2724 | * for example. | |
2725 | * | |
2726 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2727 | * and 0 is returned, otherwise a negative errno is returned. | |
2728 | */ | |
2729 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2730 | unsigned *vsel_reg, | |
2731 | unsigned *vsel_mask) | |
2732 | { | |
39f5460d GX |
2733 | struct regulator_dev *rdev = regulator->rdev; |
2734 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2735 | |
2736 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2737 | return -EOPNOTSUPP; | |
2738 | ||
0d5c8633 CIK |
2739 | *vsel_reg = rdev->desc->vsel_reg; |
2740 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c TT |
2741 | |
2742 | return 0; | |
2743 | } | |
2744 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2745 | ||
2746 | /** | |
2747 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2748 | * @regulator: regulator source | |
2749 | * @selector: identify voltage to list | |
2750 | * | |
2751 | * Converts the selector to a hardware-specific voltage selector that can be | |
2752 | * directly written to the regulator registers. The address of the voltage | |
2753 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2754 | * | |
2755 | * On error a negative errno is returned. | |
2756 | */ | |
2757 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2758 | unsigned selector) | |
2759 | { | |
39f5460d GX |
2760 | struct regulator_dev *rdev = regulator->rdev; |
2761 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2762 | |
2763 | if (selector >= rdev->desc->n_voltages) | |
2764 | return -EINVAL; | |
2765 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2766 | return -EOPNOTSUPP; | |
2767 | ||
2768 | return selector; | |
2769 | } | |
2770 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2771 | ||
2a668a8b PW |
2772 | /** |
2773 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2774 | * @regulator: regulator source | |
2775 | * | |
2776 | * Returns the voltage step size between VSEL values for linear | |
2777 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2778 | */ | |
2779 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2780 | { | |
2781 | struct regulator_dev *rdev = regulator->rdev; | |
2782 | ||
2783 | return rdev->desc->uV_step; | |
2784 | } | |
2785 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2786 | ||
a7a1ad90 MB |
2787 | /** |
2788 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2789 | * | |
2790 | * @regulator: Regulator to check. | |
2791 | * @min_uV: Minimum required voltage in uV. | |
2792 | * @max_uV: Maximum required voltage in uV. | |
2793 | * | |
2794 | * Returns a boolean or a negative error code. | |
2795 | */ | |
2796 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2797 | int min_uV, int max_uV) | |
2798 | { | |
c5f3939b | 2799 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2800 | int i, voltages, ret; |
2801 | ||
c5f3939b | 2802 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 2803 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
2804 | ret = regulator_get_voltage(regulator); |
2805 | if (ret >= 0) | |
0d25d09d | 2806 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2807 | else |
2808 | return ret; | |
2809 | } | |
2810 | ||
bd7a2b60 PM |
2811 | /* Any voltage within constrains range is fine? */ |
2812 | if (rdev->desc->continuous_voltage_range) | |
2813 | return min_uV >= rdev->constraints->min_uV && | |
2814 | max_uV <= rdev->constraints->max_uV; | |
2815 | ||
a7a1ad90 MB |
2816 | ret = regulator_count_voltages(regulator); |
2817 | if (ret < 0) | |
2818 | return ret; | |
2819 | voltages = ret; | |
2820 | ||
2821 | for (i = 0; i < voltages; i++) { | |
2822 | ret = regulator_list_voltage(regulator, i); | |
2823 | ||
2824 | if (ret >= min_uV && ret <= max_uV) | |
2825 | return 1; | |
2826 | } | |
2827 | ||
2828 | return 0; | |
2829 | } | |
a398eaa2 | 2830 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2831 | |
a204f41e SH |
2832 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
2833 | int max_uV) | |
2834 | { | |
2835 | const struct regulator_desc *desc = rdev->desc; | |
2836 | ||
2837 | if (desc->ops->map_voltage) | |
2838 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
2839 | ||
2840 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
2841 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
2842 | ||
2843 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
2844 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
2845 | ||
18e4b55f MV |
2846 | if (desc->ops->list_voltage == |
2847 | regulator_list_voltage_pickable_linear_range) | |
2848 | return regulator_map_voltage_pickable_linear_range(rdev, | |
2849 | min_uV, max_uV); | |
2850 | ||
a204f41e SH |
2851 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
2852 | } | |
2853 | ||
7179569a HS |
2854 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2855 | int min_uV, int max_uV, | |
2856 | unsigned *selector) | |
2857 | { | |
2858 | struct pre_voltage_change_data data; | |
2859 | int ret; | |
2860 | ||
2861 | data.old_uV = _regulator_get_voltage(rdev); | |
2862 | data.min_uV = min_uV; | |
2863 | data.max_uV = max_uV; | |
2864 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2865 | &data); | |
2866 | if (ret & NOTIFY_STOP_MASK) | |
2867 | return -EINVAL; | |
2868 | ||
2869 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2870 | if (ret >= 0) | |
2871 | return ret; | |
2872 | ||
2873 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2874 | (void *)data.old_uV); | |
2875 | ||
2876 | return ret; | |
2877 | } | |
2878 | ||
2879 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2880 | int uV, unsigned selector) | |
2881 | { | |
2882 | struct pre_voltage_change_data data; | |
2883 | int ret; | |
2884 | ||
2885 | data.old_uV = _regulator_get_voltage(rdev); | |
2886 | data.min_uV = uV; | |
2887 | data.max_uV = uV; | |
2888 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2889 | &data); | |
2890 | if (ret & NOTIFY_STOP_MASK) | |
2891 | return -EINVAL; | |
2892 | ||
2893 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2894 | if (ret >= 0) | |
2895 | return ret; | |
2896 | ||
2897 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2898 | (void *)data.old_uV); | |
2899 | ||
2900 | return ret; | |
2901 | } | |
2902 | ||
73e705bf MK |
2903 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
2904 | int old_uV, int new_uV) | |
2905 | { | |
2906 | unsigned int ramp_delay = 0; | |
2907 | ||
2908 | if (rdev->constraints->ramp_delay) | |
2909 | ramp_delay = rdev->constraints->ramp_delay; | |
2910 | else if (rdev->desc->ramp_delay) | |
2911 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
2912 | else if (rdev->constraints->settling_time) |
2913 | return rdev->constraints->settling_time; | |
3ffad468 MK |
2914 | else if (rdev->constraints->settling_time_up && |
2915 | (new_uV > old_uV)) | |
2916 | return rdev->constraints->settling_time_up; | |
2917 | else if (rdev->constraints->settling_time_down && | |
2918 | (new_uV < old_uV)) | |
2919 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
2920 | |
2921 | if (ramp_delay == 0) { | |
ba14fa1a | 2922 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
2923 | return 0; |
2924 | } | |
2925 | ||
2926 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
2927 | } | |
2928 | ||
75790251 MB |
2929 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2930 | int min_uV, int max_uV) | |
2931 | { | |
2932 | int ret; | |
77af1b26 | 2933 | int delay = 0; |
e113d792 | 2934 | int best_val = 0; |
75790251 | 2935 | unsigned int selector; |
eba41a5e | 2936 | int old_selector = -1; |
57995a48 | 2937 | const struct regulator_ops *ops = rdev->desc->ops; |
73e705bf | 2938 | int old_uV = _regulator_get_voltage(rdev); |
75790251 MB |
2939 | |
2940 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2941 | ||
bf5892a8 MB |
2942 | min_uV += rdev->constraints->uV_offset; |
2943 | max_uV += rdev->constraints->uV_offset; | |
2944 | ||
eba41a5e AL |
2945 | /* |
2946 | * If we can't obtain the old selector there is not enough | |
2947 | * info to call set_voltage_time_sel(). | |
2948 | */ | |
8b7485ef | 2949 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
2950 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
2951 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
2952 | if (old_selector < 0) |
2953 | return old_selector; | |
2954 | } | |
2955 | ||
57995a48 | 2956 | if (ops->set_voltage) { |
7179569a HS |
2957 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2958 | &selector); | |
e113d792 MB |
2959 | |
2960 | if (ret >= 0) { | |
57995a48 MK |
2961 | if (ops->list_voltage) |
2962 | best_val = ops->list_voltage(rdev, | |
2963 | selector); | |
e113d792 MB |
2964 | else |
2965 | best_val = _regulator_get_voltage(rdev); | |
2966 | } | |
2967 | ||
57995a48 | 2968 | } else if (ops->set_voltage_sel) { |
a204f41e | 2969 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 2970 | if (ret >= 0) { |
57995a48 | 2971 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
2972 | if (min_uV <= best_val && max_uV >= best_val) { |
2973 | selector = ret; | |
c66a566a AL |
2974 | if (old_selector == selector) |
2975 | ret = 0; | |
2976 | else | |
7179569a HS |
2977 | ret = _regulator_call_set_voltage_sel( |
2978 | rdev, best_val, selector); | |
e113d792 MB |
2979 | } else { |
2980 | ret = -EINVAL; | |
2981 | } | |
e8eef82b | 2982 | } |
75790251 MB |
2983 | } else { |
2984 | ret = -EINVAL; | |
2985 | } | |
e8eef82b | 2986 | |
31dfe686 MK |
2987 | if (ret) |
2988 | goto out; | |
77af1b26 | 2989 | |
73e705bf MK |
2990 | if (ops->set_voltage_time_sel) { |
2991 | /* | |
2992 | * Call set_voltage_time_sel if successfully obtained | |
2993 | * old_selector | |
2994 | */ | |
2995 | if (old_selector >= 0 && old_selector != selector) | |
2996 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
2997 | selector); | |
2998 | } else { | |
2999 | if (old_uV != best_val) { | |
3000 | if (ops->set_voltage_time) | |
3001 | delay = ops->set_voltage_time(rdev, old_uV, | |
3002 | best_val); | |
3003 | else | |
3004 | delay = _regulator_set_voltage_time(rdev, | |
3005 | old_uV, | |
3006 | best_val); | |
e8eef82b | 3007 | } |
73e705bf | 3008 | } |
75790251 | 3009 | |
73e705bf MK |
3010 | if (delay < 0) { |
3011 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
3012 | delay = 0; | |
77af1b26 LW |
3013 | } |
3014 | ||
73e705bf MK |
3015 | /* Insert any necessary delays */ |
3016 | if (delay >= 1000) { | |
3017 | mdelay(delay / 1000); | |
3018 | udelay(delay % 1000); | |
3019 | } else if (delay) { | |
3020 | udelay(delay); | |
77af1b26 LW |
3021 | } |
3022 | ||
31dfe686 | 3023 | if (best_val >= 0) { |
2f6c797f AL |
3024 | unsigned long data = best_val; |
3025 | ||
ded06a52 | 3026 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3027 | (void *)data); |
3028 | } | |
ded06a52 | 3029 | |
31dfe686 | 3030 | out: |
eba41a5e | 3031 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3032 | |
3033 | return ret; | |
3034 | } | |
3035 | ||
f7efad10 CZ |
3036 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3037 | int min_uV, int max_uV, suspend_state_t state) | |
3038 | { | |
3039 | struct regulator_state *rstate; | |
3040 | int uV, sel; | |
3041 | ||
3042 | rstate = regulator_get_suspend_state(rdev, state); | |
3043 | if (rstate == NULL) | |
3044 | return -EINVAL; | |
3045 | ||
3046 | if (min_uV < rstate->min_uV) | |
3047 | min_uV = rstate->min_uV; | |
3048 | if (max_uV > rstate->max_uV) | |
3049 | max_uV = rstate->max_uV; | |
3050 | ||
3051 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3052 | if (sel < 0) | |
3053 | return sel; | |
3054 | ||
3055 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3056 | if (uV >= min_uV && uV <= max_uV) | |
3057 | rstate->uV = uV; | |
3058 | ||
3059 | return 0; | |
3060 | } | |
3061 | ||
a9f226bc | 3062 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3063 | int min_uV, int max_uV, |
3064 | suspend_state_t state) | |
414c70cb LG |
3065 | { |
3066 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3067 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3068 | int ret = 0; |
92d7a558 | 3069 | int old_min_uV, old_max_uV; |
c00dc359 | 3070 | int current_uV; |
414c70cb | 3071 | |
95a3c23a MB |
3072 | /* If we're setting the same range as last time the change |
3073 | * should be a noop (some cpufreq implementations use the same | |
3074 | * voltage for multiple frequencies, for example). | |
3075 | */ | |
c360a6df | 3076 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3077 | goto out; |
3078 | ||
c00dc359 | 3079 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3080 | * return successfully even though the regulator does not support |
c00dc359 BA |
3081 | * changing the voltage. |
3082 | */ | |
8a34e979 | 3083 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c00dc359 BA |
3084 | current_uV = _regulator_get_voltage(rdev); |
3085 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
c360a6df CZ |
3086 | voltage->min_uV = min_uV; |
3087 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3088 | goto out; |
3089 | } | |
3090 | } | |
3091 | ||
414c70cb | 3092 | /* sanity check */ |
e8eef82b MB |
3093 | if (!rdev->desc->ops->set_voltage && |
3094 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3095 | ret = -EINVAL; |
3096 | goto out; | |
3097 | } | |
3098 | ||
3099 | /* constraints check */ | |
3100 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3101 | if (ret < 0) | |
3102 | goto out; | |
0d25d09d | 3103 | |
92d7a558 | 3104 | /* restore original values in case of error */ |
c360a6df CZ |
3105 | old_min_uV = voltage->min_uV; |
3106 | old_max_uV = voltage->max_uV; | |
3107 | voltage->min_uV = min_uV; | |
3108 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3109 | |
9243a195 MP |
3110 | /* for not coupled regulators this will just set the voltage */ |
3111 | ret = regulator_balance_voltage(rdev, state); | |
05fda3b1 | 3112 | if (ret < 0) |
92d7a558 | 3113 | goto out2; |
05fda3b1 | 3114 | |
9243a195 MP |
3115 | out: |
3116 | return 0; | |
3117 | out2: | |
3118 | voltage->min_uV = old_min_uV; | |
3119 | voltage->max_uV = old_max_uV; | |
3120 | ||
3121 | return ret; | |
3122 | } | |
3123 | ||
3124 | static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, | |
3125 | int max_uV, suspend_state_t state) | |
3126 | { | |
3127 | int best_supply_uV = 0; | |
3128 | int supply_change_uV = 0; | |
3129 | int ret; | |
3130 | ||
43fc99f2 MB |
3131 | if (rdev->supply && |
3132 | regulator_ops_is_valid(rdev->supply->rdev, | |
3133 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3134 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3135 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3136 | int current_supply_uV; |
3137 | int selector; | |
3138 | ||
3139 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3140 | if (selector < 0) { | |
3141 | ret = selector; | |
9243a195 | 3142 | goto out; |
fc42112c SH |
3143 | } |
3144 | ||
00cb9f4f | 3145 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3146 | if (best_supply_uV < 0) { |
3147 | ret = best_supply_uV; | |
9243a195 | 3148 | goto out; |
fc42112c SH |
3149 | } |
3150 | ||
3151 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3152 | ||
3153 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
3154 | if (current_supply_uV < 0) { | |
3155 | ret = current_supply_uV; | |
9243a195 | 3156 | goto out; |
fc42112c SH |
3157 | } |
3158 | ||
3159 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3160 | } | |
3161 | ||
3162 | if (supply_change_uV > 0) { | |
3163 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3164 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3165 | if (ret) { |
3166 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3167 | ret); | |
9243a195 | 3168 | goto out; |
fc42112c SH |
3169 | } |
3170 | } | |
3171 | ||
f7efad10 CZ |
3172 | if (state == PM_SUSPEND_ON) |
3173 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3174 | else | |
3175 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3176 | max_uV, state); | |
92d7a558 | 3177 | if (ret < 0) |
9243a195 | 3178 | goto out; |
0d25d09d | 3179 | |
fc42112c SH |
3180 | if (supply_change_uV < 0) { |
3181 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3182 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3183 | if (ret) |
3184 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3185 | ret); | |
3186 | /* No need to fail here */ | |
3187 | ret = 0; | |
3188 | } | |
3189 | ||
414c70cb | 3190 | out: |
69686176 MP |
3191 | return ret; |
3192 | } | |
3193 | ||
85254bcf DO |
3194 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3195 | int *current_uV, int *min_uV) | |
3196 | { | |
3197 | struct regulation_constraints *constraints = rdev->constraints; | |
3198 | ||
3199 | /* Limit voltage change only if necessary */ | |
3200 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3201 | return 1; | |
3202 | ||
3203 | if (*current_uV < 0) { | |
3204 | *current_uV = _regulator_get_voltage(rdev); | |
3205 | ||
3206 | if (*current_uV < 0) | |
3207 | return *current_uV; | |
3208 | } | |
3209 | ||
3210 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3211 | return 1; | |
3212 | ||
3213 | /* Clamp target voltage within the given step */ | |
3214 | if (*current_uV < *min_uV) | |
3215 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3216 | *min_uV); | |
3217 | else | |
3218 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3219 | *min_uV); | |
3220 | ||
3221 | return 0; | |
3222 | } | |
3223 | ||
c054c6c7 MP |
3224 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3225 | int *current_uV, | |
3226 | int *min_uV, int *max_uV, | |
3227 | suspend_state_t state, | |
3228 | int n_coupled) | |
3229 | { | |
3230 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3231 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3232 | struct regulation_constraints *constraints = rdev->constraints; | |
3233 | int max_spread = constraints->max_spread; | |
3234 | int desired_min_uV = 0, desired_max_uV = INT_MAX; | |
3235 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3236 | int highest_min_uV = 0, target_uV, possible_uV; | |
3237 | int i, ret; | |
3238 | bool done; | |
3239 | ||
3240 | *current_uV = -1; | |
3241 | ||
3242 | /* | |
3243 | * If there are no coupled regulators, simply set the voltage | |
3244 | * demanded by consumers. | |
3245 | */ | |
3246 | if (n_coupled == 1) { | |
3247 | /* | |
3248 | * If consumers don't provide any demands, set voltage | |
3249 | * to min_uV | |
3250 | */ | |
3251 | desired_min_uV = constraints->min_uV; | |
3252 | desired_max_uV = constraints->max_uV; | |
3253 | ||
3254 | ret = regulator_check_consumers(rdev, | |
3255 | &desired_min_uV, | |
3256 | &desired_max_uV, state); | |
3257 | if (ret < 0) | |
3258 | return ret; | |
3259 | ||
3260 | possible_uV = desired_min_uV; | |
3261 | done = true; | |
3262 | ||
3263 | goto finish; | |
3264 | } | |
3265 | ||
3266 | /* Find highest min desired voltage */ | |
3267 | for (i = 0; i < n_coupled; i++) { | |
3268 | int tmp_min = 0; | |
3269 | int tmp_max = INT_MAX; | |
3270 | ||
3271 | lockdep_assert_held_once(&c_rdevs[i]->mutex); | |
3272 | ||
3273 | ret = regulator_check_consumers(c_rdevs[i], | |
3274 | &tmp_min, | |
3275 | &tmp_max, state); | |
3276 | if (ret < 0) | |
3277 | return ret; | |
3278 | ||
3279 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3280 | if (ret < 0) | |
3281 | return ret; | |
3282 | ||
3283 | highest_min_uV = max(highest_min_uV, tmp_min); | |
3284 | ||
3285 | if (i == 0) { | |
3286 | desired_min_uV = tmp_min; | |
3287 | desired_max_uV = tmp_max; | |
3288 | } | |
3289 | } | |
3290 | ||
3291 | /* | |
3292 | * Let target_uV be equal to the desired one if possible. | |
3293 | * If not, set it to minimum voltage, allowed by other coupled | |
3294 | * regulators. | |
3295 | */ | |
3296 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3297 | ||
3298 | /* | |
3299 | * Find min and max voltages, which currently aren't violating | |
3300 | * max_spread. | |
3301 | */ | |
3302 | for (i = 1; i < n_coupled; i++) { | |
3303 | int tmp_act; | |
3304 | ||
3305 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3306 | continue; | |
3307 | ||
3308 | tmp_act = _regulator_get_voltage(c_rdevs[i]); | |
3309 | if (tmp_act < 0) | |
3310 | return tmp_act; | |
3311 | ||
3312 | min_current_uV = min(tmp_act, min_current_uV); | |
3313 | max_current_uV = max(tmp_act, max_current_uV); | |
3314 | } | |
3315 | ||
3316 | /* There aren't any other regulators enabled */ | |
3317 | if (max_current_uV == 0) { | |
3318 | possible_uV = target_uV; | |
3319 | } else { | |
3320 | /* | |
3321 | * Correct target voltage, so as it currently isn't | |
3322 | * violating max_spread | |
3323 | */ | |
3324 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3325 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3326 | } | |
3327 | ||
3328 | if (possible_uV > desired_max_uV) | |
3329 | return -EINVAL; | |
3330 | ||
3331 | done = (possible_uV == target_uV); | |
3332 | desired_min_uV = possible_uV; | |
3333 | ||
3334 | finish: | |
85254bcf DO |
3335 | /* Apply max_uV_step constraint if necessary */ |
3336 | if (state == PM_SUSPEND_ON) { | |
3337 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3338 | &desired_min_uV); | |
3339 | if (ret < 0) | |
3340 | return ret; | |
3341 | ||
3342 | if (ret == 0) | |
3343 | done = false; | |
3344 | } | |
3345 | ||
c054c6c7 MP |
3346 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3347 | if (n_coupled > 1 && *current_uV == -1) { | |
3348 | ||
3349 | if (_regulator_is_enabled(rdev)) { | |
3350 | ret = _regulator_get_voltage(rdev); | |
3351 | if (ret < 0) | |
3352 | return ret; | |
3353 | ||
3354 | *current_uV = ret; | |
3355 | } else { | |
3356 | *current_uV = desired_min_uV; | |
3357 | } | |
3358 | } | |
3359 | ||
3360 | *min_uV = desired_min_uV; | |
3361 | *max_uV = desired_max_uV; | |
3362 | ||
3363 | return done; | |
3364 | } | |
3365 | ||
3366 | static int regulator_balance_voltage(struct regulator_dev *rdev, | |
3367 | suspend_state_t state) | |
3368 | { | |
3369 | struct regulator_dev **c_rdevs; | |
3370 | struct regulator_dev *best_rdev; | |
3371 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3372 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
3373 | bool best_c_rdev_done, c_rdev_done[MAX_COUPLED]; | |
3374 | unsigned int delta, best_delta; | |
3375 | ||
3376 | c_rdevs = c_desc->coupled_rdevs; | |
3377 | n_coupled = c_desc->n_coupled; | |
3378 | ||
3379 | /* | |
3380 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3381 | * other coupled regulators. | |
3382 | */ | |
3383 | if (state != PM_SUSPEND_ON) | |
3384 | n_coupled = 1; | |
3385 | ||
3386 | if (c_desc->n_resolved < n_coupled) { | |
3387 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3388 | return -EPERM; | |
3389 | } | |
3390 | ||
3391 | for (i = 0; i < n_coupled; i++) | |
3392 | c_rdev_done[i] = false; | |
3393 | ||
3394 | /* | |
3395 | * Find the best possible voltage change on each loop. Leave the loop | |
3396 | * if there isn't any possible change. | |
3397 | */ | |
3398 | do { | |
3399 | best_c_rdev_done = false; | |
3400 | best_delta = 0; | |
3401 | best_min_uV = 0; | |
3402 | best_max_uV = 0; | |
3403 | best_c_rdev = 0; | |
3404 | best_rdev = NULL; | |
3405 | ||
3406 | /* | |
3407 | * Find highest difference between optimal voltage | |
3408 | * and current voltage. | |
3409 | */ | |
3410 | for (i = 0; i < n_coupled; i++) { | |
3411 | /* | |
3412 | * optimal_uV is the best voltage that can be set for | |
3413 | * i-th regulator at the moment without violating | |
3414 | * max_spread constraint in order to balance | |
3415 | * the coupled voltages. | |
3416 | */ | |
3417 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3418 | ||
3419 | if (c_rdev_done[i]) | |
3420 | continue; | |
3421 | ||
3422 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3423 | ¤t_uV, | |
3424 | &optimal_uV, | |
3425 | &optimal_max_uV, | |
3426 | state, n_coupled); | |
3427 | if (ret < 0) | |
3428 | goto out; | |
3429 | ||
3430 | delta = abs(optimal_uV - current_uV); | |
3431 | ||
3432 | if (delta && best_delta <= delta) { | |
3433 | best_c_rdev_done = ret; | |
3434 | best_delta = delta; | |
3435 | best_rdev = c_rdevs[i]; | |
3436 | best_min_uV = optimal_uV; | |
3437 | best_max_uV = optimal_max_uV; | |
3438 | best_c_rdev = i; | |
3439 | } | |
3440 | } | |
3441 | ||
3442 | /* Nothing to change, return successfully */ | |
3443 | if (!best_rdev) { | |
3444 | ret = 0; | |
3445 | goto out; | |
3446 | } | |
9243a195 | 3447 | |
c054c6c7 MP |
3448 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3449 | best_max_uV, state); | |
9243a195 | 3450 | |
c054c6c7 MP |
3451 | if (ret < 0) |
3452 | goto out; | |
3453 | ||
3454 | c_rdev_done[best_c_rdev] = best_c_rdev_done; | |
3455 | ||
3456 | } while (n_coupled > 1); | |
3457 | ||
3458 | out: | |
3459 | return ret; | |
3460 | } | |
3461 | ||
a9f226bc SH |
3462 | /** |
3463 | * regulator_set_voltage - set regulator output voltage | |
3464 | * @regulator: regulator source | |
3465 | * @min_uV: Minimum required voltage in uV | |
3466 | * @max_uV: Maximum acceptable voltage in uV | |
3467 | * | |
3468 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3469 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3470 | * | |
3471 | * If the regulator is enabled then the voltage will change to the new value | |
3472 | * immediately otherwise if the regulator is disabled the regulator will | |
3473 | * output at the new voltage when enabled. | |
3474 | * | |
3475 | * NOTE: If the regulator is shared between several devices then the lowest | |
3476 | * request voltage that meets the system constraints will be used. | |
3477 | * Regulator system constraints must be set for this regulator before | |
3478 | * calling this function otherwise this call will fail. | |
3479 | */ | |
3480 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3481 | { | |
3482 | int ret = 0; | |
3483 | ||
9243a195 | 3484 | regulator_lock_dependent(regulator->rdev); |
a9f226bc | 3485 | |
c360a6df CZ |
3486 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3487 | PM_SUSPEND_ON); | |
a9f226bc | 3488 | |
9243a195 | 3489 | regulator_unlock_dependent(regulator->rdev); |
a9f226bc | 3490 | |
414c70cb LG |
3491 | return ret; |
3492 | } | |
3493 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3494 | ||
f7efad10 CZ |
3495 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3496 | suspend_state_t state, bool en) | |
3497 | { | |
3498 | struct regulator_state *rstate; | |
3499 | ||
3500 | rstate = regulator_get_suspend_state(rdev, state); | |
3501 | if (rstate == NULL) | |
3502 | return -EINVAL; | |
3503 | ||
3504 | if (!rstate->changeable) | |
3505 | return -EPERM; | |
3506 | ||
3edd79cf | 3507 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3508 | |
3509 | return 0; | |
3510 | } | |
3511 | ||
3512 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3513 | suspend_state_t state) | |
3514 | { | |
3515 | return regulator_suspend_toggle(rdev, state, true); | |
3516 | } | |
3517 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3518 | ||
3519 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3520 | suspend_state_t state) | |
3521 | { | |
3522 | struct regulator *regulator; | |
3523 | struct regulator_voltage *voltage; | |
3524 | ||
3525 | /* | |
3526 | * if any consumer wants this regulator device keeping on in | |
3527 | * suspend states, don't set it as disabled. | |
3528 | */ | |
3529 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3530 | voltage = ®ulator->voltage[state]; | |
3531 | if (voltage->min_uV || voltage->max_uV) | |
3532 | return 0; | |
3533 | } | |
3534 | ||
3535 | return regulator_suspend_toggle(rdev, state, false); | |
3536 | } | |
3537 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3538 | ||
3539 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3540 | int min_uV, int max_uV, | |
3541 | suspend_state_t state) | |
3542 | { | |
3543 | struct regulator_dev *rdev = regulator->rdev; | |
3544 | struct regulator_state *rstate; | |
3545 | ||
3546 | rstate = regulator_get_suspend_state(rdev, state); | |
3547 | if (rstate == NULL) | |
3548 | return -EINVAL; | |
3549 | ||
3550 | if (rstate->min_uV == rstate->max_uV) { | |
3551 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3552 | return -EPERM; | |
3553 | } | |
3554 | ||
3555 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3556 | } | |
3557 | ||
3558 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3559 | int max_uV, suspend_state_t state) | |
3560 | { | |
3561 | int ret = 0; | |
3562 | ||
3563 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3564 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3565 | return -EINVAL; | |
3566 | ||
9243a195 | 3567 | regulator_lock_dependent(regulator->rdev); |
f7efad10 CZ |
3568 | |
3569 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3570 | max_uV, state); | |
3571 | ||
9243a195 | 3572 | regulator_unlock_dependent(regulator->rdev); |
f7efad10 CZ |
3573 | |
3574 | return ret; | |
3575 | } | |
3576 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3577 | ||
88cd222b LW |
3578 | /** |
3579 | * regulator_set_voltage_time - get raise/fall time | |
3580 | * @regulator: regulator source | |
3581 | * @old_uV: starting voltage in microvolts | |
3582 | * @new_uV: target voltage in microvolts | |
3583 | * | |
3584 | * Provided with the starting and ending voltage, this function attempts to | |
3585 | * calculate the time in microseconds required to rise or fall to this new | |
3586 | * voltage. | |
3587 | */ | |
3588 | int regulator_set_voltage_time(struct regulator *regulator, | |
3589 | int old_uV, int new_uV) | |
3590 | { | |
272e2315 GX |
3591 | struct regulator_dev *rdev = regulator->rdev; |
3592 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3593 | int old_sel = -1; |
3594 | int new_sel = -1; | |
3595 | int voltage; | |
3596 | int i; | |
3597 | ||
73e705bf MK |
3598 | if (ops->set_voltage_time) |
3599 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
3600 | else if (!ops->set_voltage_time_sel) | |
3601 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
3602 | ||
88cd222b | 3603 | /* Currently requires operations to do this */ |
73e705bf | 3604 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
3605 | return -EINVAL; |
3606 | ||
3607 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3608 | /* We only look for exact voltage matches here */ | |
3609 | voltage = regulator_list_voltage(regulator, i); | |
3610 | if (voltage < 0) | |
3611 | return -EINVAL; | |
3612 | if (voltage == 0) | |
3613 | continue; | |
3614 | if (voltage == old_uV) | |
3615 | old_sel = i; | |
3616 | if (voltage == new_uV) | |
3617 | new_sel = i; | |
3618 | } | |
3619 | ||
3620 | if (old_sel < 0 || new_sel < 0) | |
3621 | return -EINVAL; | |
3622 | ||
3623 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3624 | } | |
3625 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3626 | ||
98a175b6 | 3627 | /** |
296c6566 RD |
3628 | * regulator_set_voltage_time_sel - get raise/fall time |
3629 | * @rdev: regulator source device | |
98a175b6 YSB |
3630 | * @old_selector: selector for starting voltage |
3631 | * @new_selector: selector for target voltage | |
3632 | * | |
3633 | * Provided with the starting and target voltage selectors, this function | |
3634 | * returns time in microseconds required to rise or fall to this new voltage | |
3635 | * | |
f11d08c3 | 3636 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3637 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3638 | */ |
3639 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3640 | unsigned int old_selector, | |
3641 | unsigned int new_selector) | |
3642 | { | |
f11d08c3 | 3643 | int old_volt, new_volt; |
398715ab | 3644 | |
f11d08c3 AL |
3645 | /* sanity check */ |
3646 | if (!rdev->desc->ops->list_voltage) | |
3647 | return -EINVAL; | |
398715ab | 3648 | |
f11d08c3 AL |
3649 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3650 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3651 | ||
73e705bf MK |
3652 | if (rdev->desc->ops->set_voltage_time) |
3653 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
3654 | new_volt); | |
3655 | else | |
3656 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 3657 | } |
b19dbf71 | 3658 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3659 | |
606a2562 MB |
3660 | /** |
3661 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3662 | * @regulator: regulator source | |
3663 | * | |
3664 | * Re-apply the last configured voltage. This is intended to be used | |
3665 | * where some external control source the consumer is cooperating with | |
3666 | * has caused the configured voltage to change. | |
3667 | */ | |
3668 | int regulator_sync_voltage(struct regulator *regulator) | |
3669 | { | |
3670 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3671 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
3672 | int ret, min_uV, max_uV; |
3673 | ||
66cf9a7e | 3674 | regulator_lock(rdev); |
606a2562 MB |
3675 | |
3676 | if (!rdev->desc->ops->set_voltage && | |
3677 | !rdev->desc->ops->set_voltage_sel) { | |
3678 | ret = -EINVAL; | |
3679 | goto out; | |
3680 | } | |
3681 | ||
3682 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 3683 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
3684 | ret = -EINVAL; |
3685 | goto out; | |
3686 | } | |
3687 | ||
c360a6df CZ |
3688 | min_uV = voltage->min_uV; |
3689 | max_uV = voltage->max_uV; | |
606a2562 MB |
3690 | |
3691 | /* This should be a paranoia check... */ | |
3692 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3693 | if (ret < 0) | |
3694 | goto out; | |
3695 | ||
c360a6df | 3696 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
3697 | if (ret < 0) |
3698 | goto out; | |
3699 | ||
3700 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3701 | ||
3702 | out: | |
66cf9a7e | 3703 | regulator_unlock(rdev); |
606a2562 MB |
3704 | return ret; |
3705 | } | |
3706 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3707 | ||
414c70cb LG |
3708 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3709 | { | |
bf5892a8 | 3710 | int sel, ret; |
fef95019 MB |
3711 | bool bypassed; |
3712 | ||
3713 | if (rdev->desc->ops->get_bypass) { | |
3714 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
3715 | if (ret < 0) | |
3716 | return ret; | |
3717 | if (bypassed) { | |
3718 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
3719 | if (!rdev->supply) { |
3720 | rdev_err(rdev, | |
3721 | "bypassed regulator has no supply!\n"); | |
3722 | return -EPROBE_DEFER; | |
3723 | } | |
fef95019 MB |
3724 | |
3725 | return _regulator_get_voltage(rdev->supply->rdev); | |
3726 | } | |
3727 | } | |
476c2d83 MB |
3728 | |
3729 | if (rdev->desc->ops->get_voltage_sel) { | |
3730 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3731 | if (sel < 0) | |
3732 | return sel; | |
bf5892a8 | 3733 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3734 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3735 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3736 | } else if (rdev->desc->ops->list_voltage) { |
3737 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3738 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3739 | ret = rdev->desc->fixed_uV; | |
e303996e | 3740 | } else if (rdev->supply) { |
d9b96d35 | 3741 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3742 | } else { |
414c70cb | 3743 | return -EINVAL; |
cb220d16 | 3744 | } |
bf5892a8 | 3745 | |
cb220d16 AL |
3746 | if (ret < 0) |
3747 | return ret; | |
bf5892a8 | 3748 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3749 | } |
3750 | ||
3751 | /** | |
3752 | * regulator_get_voltage - get regulator output voltage | |
3753 | * @regulator: regulator source | |
3754 | * | |
3755 | * This returns the current regulator voltage in uV. | |
3756 | * | |
3757 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
3758 | * function should not be used to determine regulator state. | |
3759 | */ | |
3760 | int regulator_get_voltage(struct regulator *regulator) | |
3761 | { | |
3762 | int ret; | |
3763 | ||
9243a195 | 3764 | regulator_lock_dependent(regulator->rdev); |
414c70cb LG |
3765 | |
3766 | ret = _regulator_get_voltage(regulator->rdev); | |
3767 | ||
9243a195 | 3768 | regulator_unlock_dependent(regulator->rdev); |
414c70cb LG |
3769 | |
3770 | return ret; | |
3771 | } | |
3772 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
3773 | ||
3774 | /** | |
3775 | * regulator_set_current_limit - set regulator output current limit | |
3776 | * @regulator: regulator source | |
ce0d10f8 | 3777 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
3778 | * @max_uA: Maximum supported current in uA |
3779 | * | |
3780 | * Sets current sink to the desired output current. This can be set during | |
3781 | * any regulator state. IOW, regulator can be disabled or enabled. | |
3782 | * | |
3783 | * If the regulator is enabled then the current will change to the new value | |
3784 | * immediately otherwise if the regulator is disabled the regulator will | |
3785 | * output at the new current when enabled. | |
3786 | * | |
3787 | * NOTE: Regulator system constraints must be set for this regulator before | |
3788 | * calling this function otherwise this call will fail. | |
3789 | */ | |
3790 | int regulator_set_current_limit(struct regulator *regulator, | |
3791 | int min_uA, int max_uA) | |
3792 | { | |
3793 | struct regulator_dev *rdev = regulator->rdev; | |
3794 | int ret; | |
3795 | ||
66cf9a7e | 3796 | regulator_lock(rdev); |
414c70cb LG |
3797 | |
3798 | /* sanity check */ | |
3799 | if (!rdev->desc->ops->set_current_limit) { | |
3800 | ret = -EINVAL; | |
3801 | goto out; | |
3802 | } | |
3803 | ||
3804 | /* constraints check */ | |
3805 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
3806 | if (ret < 0) | |
3807 | goto out; | |
3808 | ||
3809 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
3810 | out: | |
66cf9a7e | 3811 | regulator_unlock(rdev); |
414c70cb LG |
3812 | return ret; |
3813 | } | |
3814 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
3815 | ||
7e4d9683 DA |
3816 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
3817 | { | |
3818 | /* sanity check */ | |
3819 | if (!rdev->desc->ops->get_current_limit) | |
3820 | return -EINVAL; | |
3821 | ||
3822 | return rdev->desc->ops->get_current_limit(rdev); | |
3823 | } | |
3824 | ||
414c70cb LG |
3825 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
3826 | { | |
3827 | int ret; | |
3828 | ||
66cf9a7e | 3829 | regulator_lock(rdev); |
7e4d9683 | 3830 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 3831 | regulator_unlock(rdev); |
7e4d9683 | 3832 | |
414c70cb LG |
3833 | return ret; |
3834 | } | |
3835 | ||
3836 | /** | |
3837 | * regulator_get_current_limit - get regulator output current | |
3838 | * @regulator: regulator source | |
3839 | * | |
3840 | * This returns the current supplied by the specified current sink in uA. | |
3841 | * | |
3842 | * NOTE: If the regulator is disabled it will return the current value. This | |
3843 | * function should not be used to determine regulator state. | |
3844 | */ | |
3845 | int regulator_get_current_limit(struct regulator *regulator) | |
3846 | { | |
3847 | return _regulator_get_current_limit(regulator->rdev); | |
3848 | } | |
3849 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
3850 | ||
3851 | /** | |
3852 | * regulator_set_mode - set regulator operating mode | |
3853 | * @regulator: regulator source | |
3854 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
3855 | * | |
3856 | * Set regulator operating mode to increase regulator efficiency or improve | |
3857 | * regulation performance. | |
3858 | * | |
3859 | * NOTE: Regulator system constraints must be set for this regulator before | |
3860 | * calling this function otherwise this call will fail. | |
3861 | */ | |
3862 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3863 | { | |
3864 | struct regulator_dev *rdev = regulator->rdev; | |
3865 | int ret; | |
500b4ac9 | 3866 | int regulator_curr_mode; |
414c70cb | 3867 | |
66cf9a7e | 3868 | regulator_lock(rdev); |
414c70cb LG |
3869 | |
3870 | /* sanity check */ | |
3871 | if (!rdev->desc->ops->set_mode) { | |
3872 | ret = -EINVAL; | |
3873 | goto out; | |
3874 | } | |
3875 | ||
500b4ac9 SI |
3876 | /* return if the same mode is requested */ |
3877 | if (rdev->desc->ops->get_mode) { | |
3878 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3879 | if (regulator_curr_mode == mode) { | |
3880 | ret = 0; | |
3881 | goto out; | |
3882 | } | |
3883 | } | |
3884 | ||
414c70cb | 3885 | /* constraints check */ |
22c51b47 | 3886 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3887 | if (ret < 0) |
3888 | goto out; | |
3889 | ||
3890 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3891 | out: | |
66cf9a7e | 3892 | regulator_unlock(rdev); |
414c70cb LG |
3893 | return ret; |
3894 | } | |
3895 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3896 | ||
7e4d9683 DA |
3897 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
3898 | { | |
3899 | /* sanity check */ | |
3900 | if (!rdev->desc->ops->get_mode) | |
3901 | return -EINVAL; | |
3902 | ||
3903 | return rdev->desc->ops->get_mode(rdev); | |
3904 | } | |
3905 | ||
414c70cb LG |
3906 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
3907 | { | |
3908 | int ret; | |
3909 | ||
66cf9a7e | 3910 | regulator_lock(rdev); |
7e4d9683 | 3911 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 3912 | regulator_unlock(rdev); |
7e4d9683 | 3913 | |
414c70cb LG |
3914 | return ret; |
3915 | } | |
3916 | ||
3917 | /** | |
3918 | * regulator_get_mode - get regulator operating mode | |
3919 | * @regulator: regulator source | |
3920 | * | |
3921 | * Get the current regulator operating mode. | |
3922 | */ | |
3923 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3924 | { | |
3925 | return _regulator_get_mode(regulator->rdev); | |
3926 | } | |
3927 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3928 | ||
1b5b4221 AH |
3929 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
3930 | unsigned int *flags) | |
3931 | { | |
3932 | int ret; | |
3933 | ||
66cf9a7e | 3934 | regulator_lock(rdev); |
1b5b4221 AH |
3935 | |
3936 | /* sanity check */ | |
3937 | if (!rdev->desc->ops->get_error_flags) { | |
3938 | ret = -EINVAL; | |
3939 | goto out; | |
3940 | } | |
3941 | ||
3942 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
3943 | out: | |
66cf9a7e | 3944 | regulator_unlock(rdev); |
1b5b4221 AH |
3945 | return ret; |
3946 | } | |
3947 | ||
3948 | /** | |
3949 | * regulator_get_error_flags - get regulator error information | |
3950 | * @regulator: regulator source | |
3951 | * @flags: pointer to store error flags | |
3952 | * | |
3953 | * Get the current regulator error information. | |
3954 | */ | |
3955 | int regulator_get_error_flags(struct regulator *regulator, | |
3956 | unsigned int *flags) | |
3957 | { | |
3958 | return _regulator_get_error_flags(regulator->rdev, flags); | |
3959 | } | |
3960 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
3961 | ||
414c70cb | 3962 | /** |
e39ce48f | 3963 | * regulator_set_load - set regulator load |
414c70cb LG |
3964 | * @regulator: regulator source |
3965 | * @uA_load: load current | |
3966 | * | |
3967 | * Notifies the regulator core of a new device load. This is then used by | |
3968 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3969 | * operating mode for the new regulator loading. | |
3970 | * | |
3971 | * Consumer devices notify their supply regulator of the maximum power | |
3972 | * they will require (can be taken from device datasheet in the power | |
3973 | * consumption tables) when they change operational status and hence power | |
3974 | * state. Examples of operational state changes that can affect power | |
3975 | * consumption are :- | |
3976 | * | |
3977 | * o Device is opened / closed. | |
3978 | * o Device I/O is about to begin or has just finished. | |
3979 | * o Device is idling in between work. | |
3980 | * | |
3981 | * This information is also exported via sysfs to userspace. | |
3982 | * | |
3983 | * DRMS will sum the total requested load on the regulator and change | |
3984 | * to the most efficient operating mode if platform constraints allow. | |
3985 | * | |
e39ce48f | 3986 | * On error a negative errno is returned. |
414c70cb | 3987 | */ |
e39ce48f | 3988 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3989 | { |
3990 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3991 | int ret; |
d92d95b6 | 3992 | |
66cf9a7e | 3993 | regulator_lock(rdev); |
414c70cb | 3994 | regulator->uA_load = uA_load; |
8460ef38 | 3995 | ret = drms_uA_update(rdev); |
66cf9a7e | 3996 | regulator_unlock(rdev); |
8460ef38 | 3997 | |
414c70cb LG |
3998 | return ret; |
3999 | } | |
e39ce48f | 4000 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4001 | |
f59c8f9f MB |
4002 | /** |
4003 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4004 | * | |
4005 | * @regulator: Regulator to configure | |
9345dfb8 | 4006 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4007 | * |
4008 | * Allow the regulator to go into bypass mode if all other consumers | |
4009 | * for the regulator also enable bypass mode and the machine | |
4010 | * constraints allow this. Bypass mode means that the regulator is | |
4011 | * simply passing the input directly to the output with no regulation. | |
4012 | */ | |
4013 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4014 | { | |
4015 | struct regulator_dev *rdev = regulator->rdev; | |
4016 | int ret = 0; | |
4017 | ||
4018 | if (!rdev->desc->ops->set_bypass) | |
4019 | return 0; | |
4020 | ||
8a34e979 | 4021 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4022 | return 0; |
4023 | ||
66cf9a7e | 4024 | regulator_lock(rdev); |
f59c8f9f MB |
4025 | |
4026 | if (enable && !regulator->bypass) { | |
4027 | rdev->bypass_count++; | |
4028 | ||
4029 | if (rdev->bypass_count == rdev->open_count) { | |
4030 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4031 | if (ret != 0) | |
4032 | rdev->bypass_count--; | |
4033 | } | |
4034 | ||
4035 | } else if (!enable && regulator->bypass) { | |
4036 | rdev->bypass_count--; | |
4037 | ||
4038 | if (rdev->bypass_count != rdev->open_count) { | |
4039 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4040 | if (ret != 0) | |
4041 | rdev->bypass_count++; | |
4042 | } | |
4043 | } | |
4044 | ||
4045 | if (ret == 0) | |
4046 | regulator->bypass = enable; | |
4047 | ||
66cf9a7e | 4048 | regulator_unlock(rdev); |
f59c8f9f MB |
4049 | |
4050 | return ret; | |
4051 | } | |
4052 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4053 | ||
414c70cb LG |
4054 | /** |
4055 | * regulator_register_notifier - register regulator event notifier | |
4056 | * @regulator: regulator source | |
69279fb9 | 4057 | * @nb: notifier block |
414c70cb LG |
4058 | * |
4059 | * Register notifier block to receive regulator events. | |
4060 | */ | |
4061 | int regulator_register_notifier(struct regulator *regulator, | |
4062 | struct notifier_block *nb) | |
4063 | { | |
4064 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4065 | nb); | |
4066 | } | |
4067 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4068 | ||
4069 | /** | |
4070 | * regulator_unregister_notifier - unregister regulator event notifier | |
4071 | * @regulator: regulator source | |
69279fb9 | 4072 | * @nb: notifier block |
414c70cb LG |
4073 | * |
4074 | * Unregister regulator event notifier block. | |
4075 | */ | |
4076 | int regulator_unregister_notifier(struct regulator *regulator, | |
4077 | struct notifier_block *nb) | |
4078 | { | |
4079 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4080 | nb); | |
4081 | } | |
4082 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4083 | ||
b136fb44 JC |
4084 | /* notify regulator consumers and downstream regulator consumers. |
4085 | * Note mutex must be held by caller. | |
4086 | */ | |
7179569a | 4087 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4088 | unsigned long event, void *data) |
4089 | { | |
414c70cb | 4090 | /* call rdev chain first */ |
7179569a | 4091 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4092 | } |
4093 | ||
4094 | /** | |
4095 | * regulator_bulk_get - get multiple regulator consumers | |
4096 | * | |
4097 | * @dev: Device to supply | |
4098 | * @num_consumers: Number of consumers to register | |
4099 | * @consumers: Configuration of consumers; clients are stored here. | |
4100 | * | |
4101 | * @return 0 on success, an errno on failure. | |
4102 | * | |
4103 | * This helper function allows drivers to get several regulator | |
4104 | * consumers in one operation. If any of the regulators cannot be | |
4105 | * acquired then any regulators that were allocated will be freed | |
4106 | * before returning to the caller. | |
4107 | */ | |
4108 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4109 | struct regulator_bulk_data *consumers) | |
4110 | { | |
4111 | int i; | |
4112 | int ret; | |
4113 | ||
4114 | for (i = 0; i < num_consumers; i++) | |
4115 | consumers[i].consumer = NULL; | |
4116 | ||
4117 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4118 | consumers[i].consumer = regulator_get(dev, |
4119 | consumers[i].supply); | |
414c70cb | 4120 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 4121 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
4122 | dev_err(dev, "Failed to get supply '%s': %d\n", |
4123 | consumers[i].supply, ret); | |
414c70cb LG |
4124 | consumers[i].consumer = NULL; |
4125 | goto err; | |
4126 | } | |
4127 | } | |
4128 | ||
4129 | return 0; | |
4130 | ||
4131 | err: | |
b29c7690 | 4132 | while (--i >= 0) |
414c70cb LG |
4133 | regulator_put(consumers[i].consumer); |
4134 | ||
4135 | return ret; | |
4136 | } | |
4137 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4138 | ||
f21e0e81 MB |
4139 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4140 | { | |
4141 | struct regulator_bulk_data *bulk = data; | |
4142 | ||
4143 | bulk->ret = regulator_enable(bulk->consumer); | |
4144 | } | |
4145 | ||
414c70cb LG |
4146 | /** |
4147 | * regulator_bulk_enable - enable multiple regulator consumers | |
4148 | * | |
4149 | * @num_consumers: Number of consumers | |
4150 | * @consumers: Consumer data; clients are stored here. | |
4151 | * @return 0 on success, an errno on failure | |
4152 | * | |
4153 | * This convenience API allows consumers to enable multiple regulator | |
4154 | * clients in a single API call. If any consumers cannot be enabled | |
4155 | * then any others that were enabled will be disabled again prior to | |
4156 | * return. | |
4157 | */ | |
4158 | int regulator_bulk_enable(int num_consumers, | |
4159 | struct regulator_bulk_data *consumers) | |
4160 | { | |
2955b47d | 4161 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4162 | int i; |
f21e0e81 | 4163 | int ret = 0; |
414c70cb | 4164 | |
6492bc1b MB |
4165 | for (i = 0; i < num_consumers; i++) { |
4166 | if (consumers[i].consumer->always_on) | |
4167 | consumers[i].ret = 0; | |
4168 | else | |
4169 | async_schedule_domain(regulator_bulk_enable_async, | |
4170 | &consumers[i], &async_domain); | |
4171 | } | |
f21e0e81 MB |
4172 | |
4173 | async_synchronize_full_domain(&async_domain); | |
4174 | ||
4175 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4176 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4177 | if (consumers[i].ret != 0) { |
4178 | ret = consumers[i].ret; | |
414c70cb | 4179 | goto err; |
f21e0e81 | 4180 | } |
414c70cb LG |
4181 | } |
4182 | ||
4183 | return 0; | |
4184 | ||
4185 | err: | |
fbe31057 AH |
4186 | for (i = 0; i < num_consumers; i++) { |
4187 | if (consumers[i].ret < 0) | |
4188 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
4189 | consumers[i].ret); | |
4190 | else | |
4191 | regulator_disable(consumers[i].consumer); | |
4192 | } | |
414c70cb LG |
4193 | |
4194 | return ret; | |
4195 | } | |
4196 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4197 | ||
4198 | /** | |
4199 | * regulator_bulk_disable - disable multiple regulator consumers | |
4200 | * | |
4201 | * @num_consumers: Number of consumers | |
4202 | * @consumers: Consumer data; clients are stored here. | |
4203 | * @return 0 on success, an errno on failure | |
4204 | * | |
4205 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4206 | * clients in a single API call. If any consumers cannot be disabled |
4207 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4208 | * return. |
4209 | */ | |
4210 | int regulator_bulk_disable(int num_consumers, | |
4211 | struct regulator_bulk_data *consumers) | |
4212 | { | |
4213 | int i; | |
01e86f49 | 4214 | int ret, r; |
414c70cb | 4215 | |
49e22632 | 4216 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4217 | ret = regulator_disable(consumers[i].consumer); |
4218 | if (ret != 0) | |
4219 | goto err; | |
4220 | } | |
4221 | ||
4222 | return 0; | |
4223 | ||
4224 | err: | |
5da84fd9 | 4225 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
4226 | for (++i; i < num_consumers; ++i) { |
4227 | r = regulator_enable(consumers[i].consumer); | |
4228 | if (r != 0) | |
d1642ea7 | 4229 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
4230 | consumers[i].supply, r); |
4231 | } | |
414c70cb LG |
4232 | |
4233 | return ret; | |
4234 | } | |
4235 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4236 | ||
e1de2f42 DK |
4237 | /** |
4238 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4239 | * | |
4240 | * @num_consumers: Number of consumers | |
4241 | * @consumers: Consumer data; clients are stored here. | |
4242 | * @return 0 on success, an errno on failure | |
4243 | * | |
4244 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4245 | * clients in a single API call. | |
4246 | * NOTE: This should be used for situations when device damage will | |
4247 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4248 | * Although regulator_force_disable function call for some consumers can | |
4249 | * return error numbers, the function is called for all consumers. | |
4250 | */ | |
4251 | int regulator_bulk_force_disable(int num_consumers, | |
4252 | struct regulator_bulk_data *consumers) | |
4253 | { | |
4254 | int i; | |
b8c77ff6 | 4255 | int ret = 0; |
e1de2f42 | 4256 | |
b8c77ff6 | 4257 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4258 | consumers[i].ret = |
4259 | regulator_force_disable(consumers[i].consumer); | |
4260 | ||
b8c77ff6 DT |
4261 | /* Store first error for reporting */ |
4262 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4263 | ret = consumers[i].ret; |
e1de2f42 DK |
4264 | } |
4265 | ||
e1de2f42 DK |
4266 | return ret; |
4267 | } | |
4268 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4269 | ||
414c70cb LG |
4270 | /** |
4271 | * regulator_bulk_free - free multiple regulator consumers | |
4272 | * | |
4273 | * @num_consumers: Number of consumers | |
4274 | * @consumers: Consumer data; clients are stored here. | |
4275 | * | |
4276 | * This convenience API allows consumers to free multiple regulator | |
4277 | * clients in a single API call. | |
4278 | */ | |
4279 | void regulator_bulk_free(int num_consumers, | |
4280 | struct regulator_bulk_data *consumers) | |
4281 | { | |
4282 | int i; | |
4283 | ||
4284 | for (i = 0; i < num_consumers; i++) { | |
4285 | regulator_put(consumers[i].consumer); | |
4286 | consumers[i].consumer = NULL; | |
4287 | } | |
4288 | } | |
4289 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4290 | ||
4291 | /** | |
4292 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4293 | * @rdev: regulator source |
414c70cb | 4294 | * @event: notifier block |
69279fb9 | 4295 | * @data: callback-specific data. |
414c70cb LG |
4296 | * |
4297 | * Called by regulator drivers to notify clients a regulator event has | |
4298 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 4299 | * Note lock must be held by caller. |
414c70cb LG |
4300 | */ |
4301 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4302 | unsigned long event, void *data) | |
4303 | { | |
70cfef26 KK |
4304 | lockdep_assert_held_once(&rdev->mutex); |
4305 | ||
414c70cb LG |
4306 | _notifier_call_chain(rdev, event, data); |
4307 | return NOTIFY_DONE; | |
4308 | ||
4309 | } | |
4310 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4311 | ||
be721979 MB |
4312 | /** |
4313 | * regulator_mode_to_status - convert a regulator mode into a status | |
4314 | * | |
4315 | * @mode: Mode to convert | |
4316 | * | |
4317 | * Convert a regulator mode into a status. | |
4318 | */ | |
4319 | int regulator_mode_to_status(unsigned int mode) | |
4320 | { | |
4321 | switch (mode) { | |
4322 | case REGULATOR_MODE_FAST: | |
4323 | return REGULATOR_STATUS_FAST; | |
4324 | case REGULATOR_MODE_NORMAL: | |
4325 | return REGULATOR_STATUS_NORMAL; | |
4326 | case REGULATOR_MODE_IDLE: | |
4327 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4328 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4329 | return REGULATOR_STATUS_STANDBY; |
4330 | default: | |
1beaf762 | 4331 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4332 | } |
4333 | } | |
4334 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4335 | ||
39f802d6 TI |
4336 | static struct attribute *regulator_dev_attrs[] = { |
4337 | &dev_attr_name.attr, | |
4338 | &dev_attr_num_users.attr, | |
4339 | &dev_attr_type.attr, | |
4340 | &dev_attr_microvolts.attr, | |
4341 | &dev_attr_microamps.attr, | |
4342 | &dev_attr_opmode.attr, | |
4343 | &dev_attr_state.attr, | |
4344 | &dev_attr_status.attr, | |
4345 | &dev_attr_bypass.attr, | |
4346 | &dev_attr_requested_microamps.attr, | |
4347 | &dev_attr_min_microvolts.attr, | |
4348 | &dev_attr_max_microvolts.attr, | |
4349 | &dev_attr_min_microamps.attr, | |
4350 | &dev_attr_max_microamps.attr, | |
4351 | &dev_attr_suspend_standby_state.attr, | |
4352 | &dev_attr_suspend_mem_state.attr, | |
4353 | &dev_attr_suspend_disk_state.attr, | |
4354 | &dev_attr_suspend_standby_microvolts.attr, | |
4355 | &dev_attr_suspend_mem_microvolts.attr, | |
4356 | &dev_attr_suspend_disk_microvolts.attr, | |
4357 | &dev_attr_suspend_standby_mode.attr, | |
4358 | &dev_attr_suspend_mem_mode.attr, | |
4359 | &dev_attr_suspend_disk_mode.attr, | |
4360 | NULL | |
4361 | }; | |
4362 | ||
7ad68e2f DB |
4363 | /* |
4364 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4365 | * create attributes that can be meaningfully displayed. | |
4366 | */ | |
39f802d6 TI |
4367 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4368 | struct attribute *attr, int idx) | |
7ad68e2f | 4369 | { |
39f802d6 | 4370 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4371 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4372 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4373 | umode_t mode = attr->mode; |
4374 | ||
4375 | /* these three are always present */ | |
4376 | if (attr == &dev_attr_name.attr || | |
4377 | attr == &dev_attr_num_users.attr || | |
4378 | attr == &dev_attr_type.attr) | |
4379 | return mode; | |
7ad68e2f DB |
4380 | |
4381 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4382 | if (attr == &dev_attr_microvolts.attr) { |
4383 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4384 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4385 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4386 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4387 | return mode; | |
4388 | return 0; | |
f59c8f9f | 4389 | } |
7ad68e2f | 4390 | |
39f802d6 TI |
4391 | if (attr == &dev_attr_microamps.attr) |
4392 | return ops->get_current_limit ? mode : 0; | |
4393 | ||
4394 | if (attr == &dev_attr_opmode.attr) | |
4395 | return ops->get_mode ? mode : 0; | |
4396 | ||
4397 | if (attr == &dev_attr_state.attr) | |
4398 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4399 | ||
4400 | if (attr == &dev_attr_status.attr) | |
4401 | return ops->get_status ? mode : 0; | |
4402 | ||
4403 | if (attr == &dev_attr_bypass.attr) | |
4404 | return ops->get_bypass ? mode : 0; | |
4405 | ||
7ad68e2f | 4406 | /* some attributes are type-specific */ |
39f802d6 TI |
4407 | if (attr == &dev_attr_requested_microamps.attr) |
4408 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 4409 | |
7ad68e2f | 4410 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4411 | if (attr == &dev_attr_min_microvolts.attr || |
4412 | attr == &dev_attr_max_microvolts.attr) | |
4413 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4414 | ||
4415 | if (attr == &dev_attr_min_microamps.attr || | |
4416 | attr == &dev_attr_max_microamps.attr) | |
4417 | return ops->set_current_limit ? mode : 0; | |
4418 | ||
4419 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4420 | attr == &dev_attr_suspend_mem_state.attr || | |
4421 | attr == &dev_attr_suspend_disk_state.attr) | |
4422 | return mode; | |
4423 | ||
4424 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4425 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4426 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4427 | return ops->set_suspend_voltage ? mode : 0; | |
4428 | ||
4429 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4430 | attr == &dev_attr_suspend_mem_mode.attr || | |
4431 | attr == &dev_attr_suspend_disk_mode.attr) | |
4432 | return ops->set_suspend_mode ? mode : 0; | |
4433 | ||
4434 | return mode; | |
4435 | } | |
4436 | ||
4437 | static const struct attribute_group regulator_dev_group = { | |
4438 | .attrs = regulator_dev_attrs, | |
4439 | .is_visible = regulator_attr_is_visible, | |
4440 | }; | |
4441 | ||
4442 | static const struct attribute_group *regulator_dev_groups[] = { | |
4443 | ®ulator_dev_group, | |
4444 | NULL | |
4445 | }; | |
7ad68e2f | 4446 | |
39f802d6 TI |
4447 | static void regulator_dev_release(struct device *dev) |
4448 | { | |
4449 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4450 | |
4451 | kfree(rdev->constraints); | |
4452 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4453 | kfree(rdev); |
7ad68e2f DB |
4454 | } |
4455 | ||
1130e5b3 MB |
4456 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4457 | { | |
a9eaa813 GR |
4458 | struct device *parent = rdev->dev.parent; |
4459 | const char *rname = rdev_get_name(rdev); | |
4460 | char name[NAME_MAX]; | |
4461 | ||
4462 | /* Avoid duplicate debugfs directory names */ | |
4463 | if (parent && rname == rdev->desc->name) { | |
4464 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4465 | rname); | |
4466 | rname = name; | |
4467 | } | |
4468 | ||
4469 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4470 | if (!rdev->debugfs) { |
1130e5b3 | 4471 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4472 | return; |
4473 | } | |
4474 | ||
4475 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4476 | &rdev->use_count); | |
4477 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4478 | &rdev->open_count); | |
f59c8f9f MB |
4479 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4480 | &rdev->bypass_count); | |
1130e5b3 MB |
4481 | } |
4482 | ||
5e3ca2b3 JMC |
4483 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4484 | { | |
7ddede6a JH |
4485 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4486 | ||
4487 | if (regulator_resolve_supply(rdev)) | |
4488 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4489 | ||
4490 | return 0; | |
5e3ca2b3 JMC |
4491 | } |
4492 | ||
f9503385 | 4493 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4494 | { |
4495 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
4496 | int n_coupled = c_desc->n_coupled; | |
4497 | struct regulator_dev *c_rdev; | |
4498 | int i; | |
4499 | ||
4500 | for (i = 1; i < n_coupled; i++) { | |
4501 | /* already resolved */ | |
4502 | if (c_desc->coupled_rdevs[i]) | |
4503 | continue; | |
4504 | ||
4505 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
4506 | ||
f9503385 DO |
4507 | if (!c_rdev) |
4508 | continue; | |
d3d64537 | 4509 | |
f9503385 | 4510 | regulator_lock(c_rdev); |
d3d64537 | 4511 | |
f9503385 DO |
4512 | c_desc->coupled_rdevs[i] = c_rdev; |
4513 | c_desc->n_resolved++; | |
d3d64537 | 4514 | |
f9503385 | 4515 | regulator_unlock(c_rdev); |
d3d64537 | 4516 | |
f9503385 DO |
4517 | regulator_resolve_coupling(c_rdev); |
4518 | } | |
d3d64537 MP |
4519 | } |
4520 | ||
f9503385 | 4521 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4522 | { |
4523 | int n_phandles; | |
4524 | ||
4525 | if (!IS_ENABLED(CONFIG_OF)) | |
4526 | n_phandles = 0; | |
4527 | else | |
4528 | n_phandles = of_get_n_coupled(rdev); | |
4529 | ||
4530 | if (n_phandles + 1 > MAX_COUPLED) { | |
4531 | rdev_err(rdev, "too many regulators coupled\n"); | |
4532 | return -EPERM; | |
4533 | } | |
4534 | ||
4535 | /* | |
4536 | * Every regulator should always have coupling descriptor filled with | |
4537 | * at least pointer to itself. | |
4538 | */ | |
4539 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
4540 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
4541 | rdev->coupling_desc.n_resolved++; | |
4542 | ||
4543 | /* regulator isn't coupled */ | |
4544 | if (n_phandles == 0) | |
4545 | return 0; | |
4546 | ||
4547 | /* regulator, which can't change its voltage, can't be coupled */ | |
4548 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { | |
4549 | rdev_err(rdev, "voltage operation not allowed\n"); | |
4550 | return -EPERM; | |
4551 | } | |
4552 | ||
4553 | if (rdev->constraints->max_spread <= 0) { | |
4554 | rdev_err(rdev, "wrong max_spread value\n"); | |
4555 | return -EPERM; | |
4556 | } | |
4557 | ||
4558 | if (!of_check_coupling_data(rdev)) | |
4559 | return -EPERM; | |
4560 | ||
d3d64537 MP |
4561 | return 0; |
4562 | } | |
4563 | ||
414c70cb LG |
4564 | /** |
4565 | * regulator_register - register regulator | |
69279fb9 | 4566 | * @regulator_desc: regulator to register |
f47531b1 | 4567 | * @cfg: runtime configuration for regulator |
414c70cb LG |
4568 | * |
4569 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
4570 | * Returns a valid pointer to struct regulator_dev on success |
4571 | * or an ERR_PTR() on error. | |
414c70cb | 4572 | */ |
65f26846 MB |
4573 | struct regulator_dev * |
4574 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 4575 | const struct regulator_config *cfg) |
414c70cb | 4576 | { |
9a8f5e07 | 4577 | const struct regulation_constraints *constraints = NULL; |
c172708d | 4578 | const struct regulator_init_data *init_data; |
1b3de223 | 4579 | struct regulator_config *config = NULL; |
72dca06f | 4580 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 4581 | struct regulator_dev *rdev; |
32c8fad4 | 4582 | struct device *dev; |
a5766f11 | 4583 | int ret, i; |
414c70cb | 4584 | |
1b3de223 | 4585 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
4586 | return ERR_PTR(-EINVAL); |
4587 | ||
1b3de223 | 4588 | dev = cfg->dev; |
dcf70112 | 4589 | WARN_ON(!dev); |
32c8fad4 | 4590 | |
414c70cb LG |
4591 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
4592 | return ERR_PTR(-EINVAL); | |
4593 | ||
cd78dfc6 DL |
4594 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
4595 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
4596 | return ERR_PTR(-EINVAL); |
4597 | ||
476c2d83 MB |
4598 | /* Only one of each should be implemented */ |
4599 | WARN_ON(regulator_desc->ops->get_voltage && | |
4600 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
4601 | WARN_ON(regulator_desc->ops->set_voltage && |
4602 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
4603 | |
4604 | /* If we're using selectors we must implement list_voltage. */ | |
4605 | if (regulator_desc->ops->get_voltage_sel && | |
4606 | !regulator_desc->ops->list_voltage) { | |
4607 | return ERR_PTR(-EINVAL); | |
4608 | } | |
e8eef82b MB |
4609 | if (regulator_desc->ops->set_voltage_sel && |
4610 | !regulator_desc->ops->list_voltage) { | |
4611 | return ERR_PTR(-EINVAL); | |
4612 | } | |
476c2d83 | 4613 | |
414c70cb LG |
4614 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
4615 | if (rdev == NULL) | |
4616 | return ERR_PTR(-ENOMEM); | |
4617 | ||
1b3de223 KK |
4618 | /* |
4619 | * Duplicate the config so the driver could override it after | |
4620 | * parsing init data. | |
4621 | */ | |
4622 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
4623 | if (config == NULL) { | |
4624 | kfree(rdev); | |
4625 | return ERR_PTR(-ENOMEM); | |
4626 | } | |
4627 | ||
bfa21a0d | 4628 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
4629 | &rdev->dev.of_node); |
4630 | if (!init_data) { | |
4631 | init_data = config->init_data; | |
4632 | rdev->dev.of_node = of_node_get(config->of_node); | |
4633 | } | |
4634 | ||
414c70cb | 4635 | mutex_init(&rdev->mutex); |
c172708d | 4636 | rdev->reg_data = config->driver_data; |
414c70cb LG |
4637 | rdev->owner = regulator_desc->owner; |
4638 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
4639 | if (config->regmap) |
4640 | rdev->regmap = config->regmap; | |
52b84dac | 4641 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 4642 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
4643 | else if (dev->parent) |
4644 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 4645 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 4646 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 4647 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 4648 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 4649 | |
a5766f11 | 4650 | /* preform any regulator specific init */ |
9a8f5e07 | 4651 | if (init_data && init_data->regulator_init) { |
a5766f11 | 4652 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
4653 | if (ret < 0) |
4654 | goto clean; | |
a5766f11 LG |
4655 | } |
4656 | ||
e45e290a LW |
4657 | if (config->ena_gpiod || |
4658 | ((config->ena_gpio || config->ena_gpio_initialized) && | |
4659 | gpio_is_valid(config->ena_gpio))) { | |
45389c47 | 4660 | mutex_lock(®ulator_list_mutex); |
daad134d | 4661 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 4662 | mutex_unlock(®ulator_list_mutex); |
daad134d KA |
4663 | if (ret != 0) { |
4664 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
4665 | config->ena_gpio, ret); | |
32165230 | 4666 | goto clean; |
daad134d KA |
4667 | } |
4668 | } | |
4669 | ||
a5766f11 | 4670 | /* register with sysfs */ |
414c70cb | 4671 | rdev->dev.class = ®ulator_class; |
a5766f11 | 4672 | rdev->dev.parent = dev; |
72dca06f | 4673 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 4674 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 4675 | |
74f544c1 | 4676 | /* set regulator constraints */ |
9a8f5e07 MB |
4677 | if (init_data) |
4678 | constraints = &init_data->constraints; | |
4679 | ||
9a8f5e07 | 4680 | if (init_data && init_data->supply_regulator) |
6261b06d | 4681 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 4682 | else if (regulator_desc->supply_name) |
6261b06d | 4683 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 4684 | |
45389c47 JH |
4685 | /* |
4686 | * Attempt to resolve the regulator supply, if specified, | |
4687 | * but don't return an error if we fail because we will try | |
4688 | * to resolve it again later as more regulators are added. | |
4689 | */ | |
4690 | if (regulator_resolve_supply(rdev)) | |
4691 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4692 | ||
4693 | ret = set_machine_constraints(rdev, constraints); | |
4694 | if (ret < 0) | |
4695 | goto wash; | |
4696 | ||
f9503385 DO |
4697 | ret = regulator_init_coupling(rdev); |
4698 | if (ret < 0) | |
d3d64537 MP |
4699 | goto wash; |
4700 | ||
a5766f11 | 4701 | /* add consumers devices */ |
9a8f5e07 | 4702 | if (init_data) { |
45389c47 | 4703 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
4704 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
4705 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 4706 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 4707 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 4708 | if (ret < 0) { |
45389c47 | 4709 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
4710 | dev_err(dev, "Failed to set supply %s\n", |
4711 | init_data->consumer_supplies[i].supply); | |
4712 | goto unset_supplies; | |
4713 | } | |
23c2f041 | 4714 | } |
45389c47 | 4715 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 4716 | } |
a5766f11 | 4717 | |
fd086045 MK |
4718 | if (!rdev->desc->ops->get_voltage && |
4719 | !rdev->desc->ops->list_voltage && | |
4720 | !rdev->desc->fixed_uV) | |
4721 | rdev->is_switch = true; | |
4722 | ||
fb6de923 | 4723 | dev_set_drvdata(&rdev->dev, rdev); |
c438b9d0 JH |
4724 | ret = device_register(&rdev->dev); |
4725 | if (ret != 0) { | |
4726 | put_device(&rdev->dev); | |
4727 | goto unset_supplies; | |
4728 | } | |
4729 | ||
1130e5b3 | 4730 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 4731 | |
f9503385 DO |
4732 | /* try to resolve regulators coupling since a new one was registered */ |
4733 | mutex_lock(®ulator_list_mutex); | |
4734 | regulator_resolve_coupling(rdev); | |
4735 | mutex_unlock(®ulator_list_mutex); | |
4736 | ||
5e3ca2b3 JMC |
4737 | /* try to resolve regulators supply since a new one was registered */ |
4738 | class_for_each_device(®ulator_class, NULL, NULL, | |
4739 | regulator_register_resolve_supply); | |
1b3de223 | 4740 | kfree(config); |
414c70cb | 4741 | return rdev; |
4fca9545 | 4742 | |
d4033b54 | 4743 | unset_supplies: |
45389c47 | 4744 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 4745 | unset_regulator_supplies(rdev); |
45389c47 | 4746 | mutex_unlock(®ulator_list_mutex); |
32165230 | 4747 | wash: |
469b640e | 4748 | kfree(rdev->constraints); |
45389c47 | 4749 | mutex_lock(®ulator_list_mutex); |
32165230 | 4750 | regulator_ena_gpio_free(rdev); |
45389c47 | 4751 | mutex_unlock(®ulator_list_mutex); |
4fca9545 DB |
4752 | clean: |
4753 | kfree(rdev); | |
a2151374 JH |
4754 | kfree(config); |
4755 | return ERR_PTR(ret); | |
414c70cb LG |
4756 | } |
4757 | EXPORT_SYMBOL_GPL(regulator_register); | |
4758 | ||
4759 | /** | |
4760 | * regulator_unregister - unregister regulator | |
69279fb9 | 4761 | * @rdev: regulator to unregister |
414c70cb LG |
4762 | * |
4763 | * Called by regulator drivers to unregister a regulator. | |
4764 | */ | |
4765 | void regulator_unregister(struct regulator_dev *rdev) | |
4766 | { | |
4767 | if (rdev == NULL) | |
4768 | return; | |
4769 | ||
891636ea MB |
4770 | if (rdev->supply) { |
4771 | while (rdev->use_count--) | |
4772 | regulator_disable(rdev->supply); | |
e032b376 | 4773 | regulator_put(rdev->supply); |
891636ea | 4774 | } |
414c70cb | 4775 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 4776 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 4777 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 4778 | WARN_ON(rdev->open_count); |
0f1d747b | 4779 | unset_regulator_supplies(rdev); |
414c70cb | 4780 | list_del(&rdev->list); |
f19b00da | 4781 | regulator_ena_gpio_free(rdev); |
2c0a303a | 4782 | mutex_unlock(®ulator_list_mutex); |
58fb5cf5 | 4783 | device_unregister(&rdev->dev); |
414c70cb LG |
4784 | } |
4785 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
4786 | ||
f7efad10 | 4787 | #ifdef CONFIG_SUSPEND |
414c70cb | 4788 | /** |
0380cf7d | 4789 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 4790 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
4791 | * |
4792 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 4793 | */ |
0380cf7d | 4794 | static int regulator_suspend(struct device *dev) |
414c70cb | 4795 | { |
cd7e36ab | 4796 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 4797 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab MS |
4798 | int ret; |
4799 | ||
4800 | regulator_lock(rdev); | |
4801 | ret = suspend_set_state(rdev, state); | |
4802 | regulator_unlock(rdev); | |
414c70cb | 4803 | |
cd7e36ab | 4804 | return ret; |
85f3b431 | 4805 | } |
d3e4eccb | 4806 | |
cd7e36ab | 4807 | static int regulator_resume(struct device *dev) |
85f3b431 | 4808 | { |
cd7e36ab | 4809 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 4810 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 4811 | struct regulator_state *rstate; |
cd7e36ab | 4812 | int ret = 0; |
f7efad10 | 4813 | |
cd7e36ab | 4814 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 4815 | if (rstate == NULL) |
35b5f14e | 4816 | return 0; |
414c70cb | 4817 | |
66cf9a7e | 4818 | regulator_lock(rdev); |
85f3b431 | 4819 | |
0380cf7d | 4820 | if (rdev->desc->ops->resume && |
f7efad10 CZ |
4821 | (rstate->enabled == ENABLE_IN_SUSPEND || |
4822 | rstate->enabled == DISABLE_IN_SUSPEND)) | |
0380cf7d | 4823 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 4824 | |
66cf9a7e | 4825 | regulator_unlock(rdev); |
85f3b431 | 4826 | |
f7efad10 | 4827 | return ret; |
414c70cb | 4828 | } |
f7efad10 CZ |
4829 | #else /* !CONFIG_SUSPEND */ |
4830 | ||
0380cf7d | 4831 | #define regulator_suspend NULL |
4832 | #define regulator_resume NULL | |
f7efad10 CZ |
4833 | |
4834 | #endif /* !CONFIG_SUSPEND */ | |
4835 | ||
4836 | #ifdef CONFIG_PM | |
4837 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 4838 | .suspend = regulator_suspend, |
4839 | .resume = regulator_resume, | |
f7efad10 CZ |
4840 | }; |
4841 | #endif | |
4842 | ||
285c22de | 4843 | struct class regulator_class = { |
f7efad10 CZ |
4844 | .name = "regulator", |
4845 | .dev_release = regulator_dev_release, | |
4846 | .dev_groups = regulator_dev_groups, | |
4847 | #ifdef CONFIG_PM | |
4848 | .pm = ®ulator_pm_ops, | |
4849 | #endif | |
4850 | }; | |
ca725561 MB |
4851 | /** |
4852 | * regulator_has_full_constraints - the system has fully specified constraints | |
4853 | * | |
4854 | * Calling this function will cause the regulator API to disable all | |
4855 | * regulators which have a zero use count and don't have an always_on | |
4856 | * constraint in a late_initcall. | |
4857 | * | |
4858 | * The intention is that this will become the default behaviour in a | |
4859 | * future kernel release so users are encouraged to use this facility | |
4860 | * now. | |
4861 | */ | |
4862 | void regulator_has_full_constraints(void) | |
4863 | { | |
4864 | has_full_constraints = 1; | |
4865 | } | |
4866 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
4867 | ||
414c70cb LG |
4868 | /** |
4869 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 4870 | * @rdev: regulator |
414c70cb LG |
4871 | * |
4872 | * Get rdev regulator driver private data. This call can be used in the | |
4873 | * regulator driver context. | |
4874 | */ | |
4875 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
4876 | { | |
4877 | return rdev->reg_data; | |
4878 | } | |
4879 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
4880 | ||
4881 | /** | |
4882 | * regulator_get_drvdata - get regulator driver data | |
4883 | * @regulator: regulator | |
4884 | * | |
4885 | * Get regulator driver private data. This call can be used in the consumer | |
4886 | * driver context when non API regulator specific functions need to be called. | |
4887 | */ | |
4888 | void *regulator_get_drvdata(struct regulator *regulator) | |
4889 | { | |
4890 | return regulator->rdev->reg_data; | |
4891 | } | |
4892 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
4893 | ||
4894 | /** | |
4895 | * regulator_set_drvdata - set regulator driver data | |
4896 | * @regulator: regulator | |
4897 | * @data: data | |
4898 | */ | |
4899 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
4900 | { | |
4901 | regulator->rdev->reg_data = data; | |
4902 | } | |
4903 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
4904 | ||
4905 | /** | |
4906 | * regulator_get_id - get regulator ID | |
69279fb9 | 4907 | * @rdev: regulator |
414c70cb LG |
4908 | */ |
4909 | int rdev_get_id(struct regulator_dev *rdev) | |
4910 | { | |
4911 | return rdev->desc->id; | |
4912 | } | |
4913 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
4914 | ||
a5766f11 LG |
4915 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
4916 | { | |
4917 | return &rdev->dev; | |
4918 | } | |
4919 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
4920 | ||
4921 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
4922 | { | |
4923 | return reg_init_data->driver_data; | |
4924 | } | |
4925 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
4926 | ||
ba55a974 | 4927 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 4928 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 4929 | { |
ba55a974 MB |
4930 | struct regulator_map *map; |
4931 | ||
ba55a974 | 4932 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
4933 | seq_printf(sf, "%s -> %s.%s\n", |
4934 | rdev_get_name(map->regulator), map->dev_name, | |
4935 | map->supply); | |
ba55a974 MB |
4936 | } |
4937 | ||
dbc55955 HZ |
4938 | return 0; |
4939 | } | |
ba55a974 | 4940 | |
dbc55955 HZ |
4941 | static int supply_map_open(struct inode *inode, struct file *file) |
4942 | { | |
4943 | return single_open(file, supply_map_show, inode->i_private); | |
ba55a974 | 4944 | } |
24751434 | 4945 | #endif |
ba55a974 MB |
4946 | |
4947 | static const struct file_operations supply_map_fops = { | |
24751434 | 4948 | #ifdef CONFIG_DEBUG_FS |
dbc55955 HZ |
4949 | .open = supply_map_open, |
4950 | .read = seq_read, | |
4951 | .llseek = seq_lseek, | |
4952 | .release = single_release, | |
ba55a974 | 4953 | #endif |
24751434 | 4954 | }; |
ba55a974 | 4955 | |
7c225ec9 | 4956 | #ifdef CONFIG_DEBUG_FS |
85f3b431 TV |
4957 | struct summary_data { |
4958 | struct seq_file *s; | |
4959 | struct regulator_dev *parent; | |
4960 | int level; | |
4961 | }; | |
4962 | ||
4963 | static void regulator_summary_show_subtree(struct seq_file *s, | |
4964 | struct regulator_dev *rdev, | |
4965 | int level); | |
4966 | ||
4967 | static int regulator_summary_show_children(struct device *dev, void *data) | |
4968 | { | |
4969 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4970 | struct summary_data *summary_data = data; | |
4971 | ||
4972 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
4973 | regulator_summary_show_subtree(summary_data->s, rdev, | |
4974 | summary_data->level + 1); | |
4975 | ||
4976 | return 0; | |
4977 | } | |
4978 | ||
7c225ec9 HS |
4979 | static void regulator_summary_show_subtree(struct seq_file *s, |
4980 | struct regulator_dev *rdev, | |
4981 | int level) | |
4982 | { | |
7c225ec9 HS |
4983 | struct regulation_constraints *c; |
4984 | struct regulator *consumer; | |
85f3b431 | 4985 | struct summary_data summary_data; |
7e4d9683 | 4986 | unsigned int opmode; |
7c225ec9 HS |
4987 | |
4988 | if (!rdev) | |
4989 | return; | |
4990 | ||
7e4d9683 DA |
4991 | regulator_lock_nested(rdev, level); |
4992 | ||
4993 | opmode = _regulator_get_mode_unlocked(rdev); | |
01de19d0 | 4994 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
4995 | level * 3 + 1, "", |
4996 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 4997 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 4998 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 4999 | |
23296099 | 5000 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
7e4d9683 DA |
5001 | seq_printf(s, "%5dmA ", |
5002 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5003 | |
5004 | c = rdev->constraints; | |
5005 | if (c) { | |
5006 | switch (rdev->desc->type) { | |
5007 | case REGULATOR_VOLTAGE: | |
5008 | seq_printf(s, "%5dmV %5dmV ", | |
5009 | c->min_uV / 1000, c->max_uV / 1000); | |
5010 | break; | |
5011 | case REGULATOR_CURRENT: | |
5012 | seq_printf(s, "%5dmA %5dmA ", | |
5013 | c->min_uA / 1000, c->max_uA / 1000); | |
5014 | break; | |
5015 | } | |
5016 | } | |
5017 | ||
5018 | seq_puts(s, "\n"); | |
5019 | ||
5020 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5021 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5022 | continue; |
5023 | ||
5024 | seq_printf(s, "%*s%-*s ", | |
5025 | (level + 1) * 3 + 1, "", | |
e42a46b6 LC |
5026 | 30 - (level + 1) * 3, |
5027 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); | |
7c225ec9 HS |
5028 | |
5029 | switch (rdev->desc->type) { | |
5030 | case REGULATOR_VOLTAGE: | |
7d3827b5 DA |
5031 | seq_printf(s, "%37dmA %5dmV %5dmV", |
5032 | consumer->uA_load / 1000, | |
c360a6df CZ |
5033 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5034 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5035 | break; |
5036 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5037 | break; |
5038 | } | |
5039 | ||
5040 | seq_puts(s, "\n"); | |
5041 | } | |
5042 | ||
85f3b431 TV |
5043 | summary_data.s = s; |
5044 | summary_data.level = level; | |
5045 | summary_data.parent = rdev; | |
7c225ec9 | 5046 | |
85f3b431 TV |
5047 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5048 | regulator_summary_show_children); | |
7e4d9683 DA |
5049 | |
5050 | regulator_unlock(rdev); | |
7c225ec9 HS |
5051 | } |
5052 | ||
85f3b431 | 5053 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5054 | { |
85f3b431 TV |
5055 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5056 | struct seq_file *s = data; | |
7c225ec9 | 5057 | |
85f3b431 TV |
5058 | if (!rdev->supply) |
5059 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5060 | |
85f3b431 TV |
5061 | return 0; |
5062 | } | |
7c225ec9 | 5063 | |
85f3b431 TV |
5064 | static int regulator_summary_show(struct seq_file *s, void *data) |
5065 | { | |
01de19d0 DA |
5066 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5067 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5068 | |
85f3b431 TV |
5069 | class_for_each_device(®ulator_class, NULL, s, |
5070 | regulator_summary_show_roots); | |
7c225ec9 HS |
5071 | |
5072 | return 0; | |
5073 | } | |
5074 | ||
5075 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
5076 | { | |
5077 | return single_open(file, regulator_summary_show, inode->i_private); | |
5078 | } | |
5079 | #endif | |
5080 | ||
5081 | static const struct file_operations regulator_summary_fops = { | |
5082 | #ifdef CONFIG_DEBUG_FS | |
5083 | .open = regulator_summary_open, | |
5084 | .read = seq_read, | |
5085 | .llseek = seq_lseek, | |
5086 | .release = single_release, | |
5087 | #endif | |
5088 | }; | |
5089 | ||
414c70cb LG |
5090 | static int __init regulator_init(void) |
5091 | { | |
34abbd68 MB |
5092 | int ret; |
5093 | ||
34abbd68 MB |
5094 | ret = class_register(®ulator_class); |
5095 | ||
1130e5b3 | 5096 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5097 | if (!debugfs_root) |
1130e5b3 | 5098 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5099 | |
f4d562c6 MB |
5100 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5101 | &supply_map_fops); | |
1130e5b3 | 5102 | |
7c225ec9 | 5103 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5104 | NULL, ®ulator_summary_fops); |
7c225ec9 | 5105 | |
34abbd68 MB |
5106 | regulator_dummy_init(); |
5107 | ||
5108 | return ret; | |
414c70cb LG |
5109 | } |
5110 | ||
5111 | /* init early to allow our consumers to complete system booting */ | |
5112 | core_initcall(regulator_init); | |
ca725561 | 5113 | |
609ca5f3 | 5114 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5115 | { |
609ca5f3 MB |
5116 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5117 | const struct regulator_ops *ops = rdev->desc->ops; | |
5118 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5119 | int enabled, ret; |
ca725561 | 5120 | |
609ca5f3 MB |
5121 | if (c && c->always_on) |
5122 | return 0; | |
5123 | ||
8a34e979 | 5124 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5125 | return 0; |
5126 | ||
66cf9a7e | 5127 | regulator_lock(rdev); |
609ca5f3 MB |
5128 | |
5129 | if (rdev->use_count) | |
5130 | goto unlock; | |
5131 | ||
5132 | /* If we can't read the status assume it's on. */ | |
5133 | if (ops->is_enabled) | |
5134 | enabled = ops->is_enabled(rdev); | |
5135 | else | |
5136 | enabled = 1; | |
5137 | ||
5138 | if (!enabled) | |
5139 | goto unlock; | |
5140 | ||
5141 | if (have_full_constraints()) { | |
5142 | /* We log since this may kill the system if it goes | |
5143 | * wrong. */ | |
5144 | rdev_info(rdev, "disabling\n"); | |
5145 | ret = _regulator_do_disable(rdev); | |
5146 | if (ret != 0) | |
5147 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
5148 | } else { | |
5149 | /* The intention is that in future we will | |
5150 | * assume that full constraints are provided | |
5151 | * so warn even if we aren't going to do | |
5152 | * anything here. | |
5153 | */ | |
5154 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5155 | } | |
5156 | ||
5157 | unlock: | |
66cf9a7e | 5158 | regulator_unlock(rdev); |
609ca5f3 MB |
5159 | |
5160 | return 0; | |
5161 | } | |
5162 | ||
5163 | static int __init regulator_init_complete(void) | |
5164 | { | |
86f5fcfc MB |
5165 | /* |
5166 | * Since DT doesn't provide an idiomatic mechanism for | |
5167 | * enabling full constraints and since it's much more natural | |
5168 | * with DT to provide them just assume that a DT enabled | |
5169 | * system has full constraints. | |
5170 | */ | |
5171 | if (of_have_populated_dt()) | |
5172 | has_full_constraints = true; | |
5173 | ||
3827b64d JMC |
5174 | /* |
5175 | * Regulators may had failed to resolve their input supplies | |
5176 | * when were registered, either because the input supply was | |
5177 | * not registered yet or because its parent device was not | |
5178 | * bound yet. So attempt to resolve the input supplies for | |
5179 | * pending regulators before trying to disable unused ones. | |
5180 | */ | |
5181 | class_for_each_device(®ulator_class, NULL, NULL, | |
5182 | regulator_register_resolve_supply); | |
5183 | ||
ca725561 | 5184 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5185 | * we have permission to change the status for and which are |
5186 | * not in use or always_on. This is effectively the default | |
5187 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5188 | */ |
609ca5f3 MB |
5189 | class_for_each_device(®ulator_class, NULL, NULL, |
5190 | regulator_late_cleanup); | |
ca725561 MB |
5191 | |
5192 | return 0; | |
5193 | } | |
fd482a3e | 5194 | late_initcall_sync(regulator_init_complete); |