Commit | Line | Data |
---|---|---|
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> |
778b28b4 | 26 | #include <linux/gpio/consumer.h> |
69511a45 | 27 | #include <linux/of.h> |
65b19ce6 | 28 | #include <linux/regmap.h> |
69511a45 | 29 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
30 | #include <linux/regulator/consumer.h> |
31 | #include <linux/regulator/driver.h> | |
32 | #include <linux/regulator/machine.h> | |
65602c32 | 33 | #include <linux/module.h> |
414c70cb | 34 | |
02fa3ec0 MB |
35 | #define CREATE_TRACE_POINTS |
36 | #include <trace/events/regulator.h> | |
37 | ||
34abbd68 | 38 | #include "dummy.h" |
0cdfcc0f | 39 | #include "internal.h" |
34abbd68 | 40 | |
7d51a0db MB |
41 | #define rdev_crit(rdev, fmt, ...) \ |
42 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
43 | #define rdev_err(rdev, fmt, ...) \ |
44 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | #define rdev_warn(rdev, fmt, ...) \ | |
46 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
47 | #define rdev_info(rdev, fmt, ...) \ | |
48 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
49 | #define rdev_dbg(rdev, fmt, ...) \ | |
50 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
51 | ||
f8702f9e DO |
52 | static DEFINE_WW_CLASS(regulator_ww_class); |
53 | static DEFINE_MUTEX(regulator_nesting_mutex); | |
414c70cb | 54 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 55 | static LIST_HEAD(regulator_map_list); |
f19b00da | 56 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 57 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 58 | static bool has_full_constraints; |
414c70cb | 59 | |
1130e5b3 | 60 | static struct dentry *debugfs_root; |
1130e5b3 | 61 | |
8dc5390d | 62 | /* |
414c70cb LG |
63 | * struct regulator_map |
64 | * | |
65 | * Used to provide symbolic supply names to devices. | |
66 | */ | |
67 | struct regulator_map { | |
68 | struct list_head list; | |
40f9244f | 69 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 70 | const char *supply; |
a5766f11 | 71 | struct regulator_dev *regulator; |
414c70cb LG |
72 | }; |
73 | ||
f19b00da KM |
74 | /* |
75 | * struct regulator_enable_gpio | |
76 | * | |
77 | * Management for shared enable GPIO pin | |
78 | */ | |
79 | struct regulator_enable_gpio { | |
80 | struct list_head list; | |
778b28b4 | 81 | struct gpio_desc *gpiod; |
f19b00da KM |
82 | u32 enable_count; /* a number of enabled shared GPIO */ |
83 | u32 request_count; /* a number of requested shared GPIO */ | |
f19b00da KM |
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); |
5451781d | 100 | static int _regulator_disable(struct regulator *regulator); |
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 | ||
66cf9a7e MP |
146 | /** |
147 | * regulator_lock_nested - lock a single regulator | |
148 | * @rdev: regulator source | |
f8702f9e | 149 | * @ww_ctx: w/w mutex acquire context |
66cf9a7e MP |
150 | * |
151 | * This function can be called many times by one task on | |
152 | * a single regulator and its mutex will be locked only | |
153 | * once. If a task, which is calling this function is other | |
154 | * than the one, which initially locked the mutex, it will | |
155 | * wait on mutex. | |
156 | */ | |
f8702f9e DO |
157 | static inline int regulator_lock_nested(struct regulator_dev *rdev, |
158 | struct ww_acquire_ctx *ww_ctx) | |
66cf9a7e | 159 | { |
f8702f9e DO |
160 | bool lock = false; |
161 | int ret = 0; | |
162 | ||
163 | mutex_lock(®ulator_nesting_mutex); | |
164 | ||
165 | if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) { | |
166 | if (rdev->mutex_owner == current) | |
66cf9a7e | 167 | rdev->ref_cnt++; |
f8702f9e DO |
168 | else |
169 | lock = true; | |
170 | ||
171 | if (lock) { | |
172 | mutex_unlock(®ulator_nesting_mutex); | |
173 | ret = ww_mutex_lock(&rdev->mutex, ww_ctx); | |
174 | mutex_lock(®ulator_nesting_mutex); | |
66cf9a7e | 175 | } |
f8702f9e DO |
176 | } else { |
177 | lock = true; | |
66cf9a7e MP |
178 | } |
179 | ||
f8702f9e DO |
180 | if (lock && ret != -EDEADLK) { |
181 | rdev->ref_cnt++; | |
182 | rdev->mutex_owner = current; | |
183 | } | |
184 | ||
185 | mutex_unlock(®ulator_nesting_mutex); | |
186 | ||
187 | return ret; | |
66cf9a7e MP |
188 | } |
189 | ||
f8702f9e DO |
190 | /** |
191 | * regulator_lock - lock a single regulator | |
192 | * @rdev: regulator source | |
193 | * | |
194 | * This function can be called many times by one task on | |
195 | * a single regulator and its mutex will be locked only | |
196 | * once. If a task, which is calling this function is other | |
197 | * than the one, which initially locked the mutex, it will | |
198 | * wait on mutex. | |
199 | */ | |
200 | void regulator_lock(struct regulator_dev *rdev) | |
66cf9a7e | 201 | { |
f8702f9e | 202 | regulator_lock_nested(rdev, NULL); |
66cf9a7e | 203 | } |
14a74272 | 204 | EXPORT_SYMBOL_GPL(regulator_lock); |
66cf9a7e MP |
205 | |
206 | /** | |
207 | * regulator_unlock - unlock a single regulator | |
208 | * @rdev: regulator_source | |
209 | * | |
210 | * This function unlocks the mutex when the | |
211 | * reference counter reaches 0. | |
212 | */ | |
f8702f9e | 213 | void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 214 | { |
f8702f9e | 215 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 216 | |
f8702f9e DO |
217 | if (--rdev->ref_cnt == 0) { |
218 | rdev->mutex_owner = NULL; | |
219 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 220 | } |
f8702f9e DO |
221 | |
222 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
223 | ||
224 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e | 225 | } |
14a74272 | 226 | EXPORT_SYMBOL_GPL(regulator_unlock); |
66cf9a7e | 227 | |
089e2cc2 | 228 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 229 | { |
089e2cc2 DO |
230 | struct regulator_dev *c_rdev; |
231 | int i; | |
232 | ||
233 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
234 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 235 | |
089e2cc2 DO |
236 | if (rdev->supply->rdev == c_rdev) |
237 | return true; | |
238 | } | |
239 | ||
240 | return false; | |
241 | } | |
242 | ||
f8702f9e DO |
243 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
244 | unsigned int n_coupled) | |
9f01cd4a | 245 | { |
9243a195 | 246 | struct regulator_dev *c_rdev; |
fa731ac7 | 247 | int i; |
9f01cd4a | 248 | |
f8702f9e DO |
249 | for (i = n_coupled; i > 0; i--) { |
250 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
251 | |
252 | if (!c_rdev) | |
253 | continue; | |
254 | ||
089e2cc2 | 255 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) |
f8702f9e DO |
256 | regulator_unlock_recursive( |
257 | c_rdev->supply->rdev, | |
258 | c_rdev->coupling_desc.n_coupled); | |
9243a195 | 259 | |
f8702f9e DO |
260 | regulator_unlock(c_rdev); |
261 | } | |
9f01cd4a SH |
262 | } |
263 | ||
f8702f9e DO |
264 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
265 | struct regulator_dev **new_contended_rdev, | |
266 | struct regulator_dev **old_contended_rdev, | |
267 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 268 | { |
9243a195 | 269 | struct regulator_dev *c_rdev; |
f8702f9e | 270 | int i, err; |
9f01cd4a | 271 | |
9243a195 MP |
272 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
273 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 274 | |
9243a195 MP |
275 | if (!c_rdev) |
276 | continue; | |
9f01cd4a | 277 | |
f8702f9e DO |
278 | if (c_rdev != *old_contended_rdev) { |
279 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
280 | if (err) { | |
281 | if (err == -EDEADLK) { | |
282 | *new_contended_rdev = c_rdev; | |
283 | goto err_unlock; | |
284 | } | |
9243a195 | 285 | |
f8702f9e DO |
286 | /* shouldn't happen */ |
287 | WARN_ON_ONCE(err != -EALREADY); | |
288 | } | |
289 | } else { | |
290 | *old_contended_rdev = NULL; | |
291 | } | |
292 | ||
089e2cc2 | 293 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
294 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
295 | new_contended_rdev, | |
296 | old_contended_rdev, | |
297 | ww_ctx); | |
298 | if (err) { | |
299 | regulator_unlock(c_rdev); | |
300 | goto err_unlock; | |
301 | } | |
66cf9a7e MP |
302 | } |
303 | } | |
f8702f9e DO |
304 | |
305 | return 0; | |
306 | ||
307 | err_unlock: | |
308 | regulator_unlock_recursive(rdev, i); | |
309 | ||
310 | return err; | |
66cf9a7e MP |
311 | } |
312 | ||
38de19fa | 313 | /** |
f8702f9e DO |
314 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
315 | * regulators | |
316 | * @rdev: regulator source | |
317 | * @ww_ctx: w/w mutex acquire context | |
318 | * | |
48f1b4ef | 319 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 320 | */ |
f8702f9e DO |
321 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
322 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 323 | { |
f8702f9e DO |
324 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
325 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
326 | } |
327 | ||
328 | /** | |
9243a195 MP |
329 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
330 | * @rdev: regulator source | |
f8702f9e | 331 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
332 | * |
333 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 334 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 335 | */ |
f8702f9e DO |
336 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
337 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 338 | { |
f8702f9e DO |
339 | struct regulator_dev *new_contended_rdev = NULL; |
340 | struct regulator_dev *old_contended_rdev = NULL; | |
341 | int err; | |
9f01cd4a | 342 | |
f8702f9e | 343 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 344 | |
f8702f9e | 345 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 346 | |
f8702f9e DO |
347 | do { |
348 | if (new_contended_rdev) { | |
349 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
350 | old_contended_rdev = new_contended_rdev; | |
351 | old_contended_rdev->ref_cnt++; | |
352 | } | |
353 | ||
354 | err = regulator_lock_recursive(rdev, | |
355 | &new_contended_rdev, | |
356 | &old_contended_rdev, | |
357 | ww_ctx); | |
358 | ||
359 | if (old_contended_rdev) | |
360 | regulator_unlock(old_contended_rdev); | |
361 | ||
362 | } while (err == -EDEADLK); | |
363 | ||
364 | ww_acquire_done(ww_ctx); | |
365 | ||
366 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
367 | } |
368 | ||
fe06051d | 369 | /** |
370 | * of_get_child_regulator - get a child regulator device node | |
371 | * based on supply name | |
372 | * @parent: Parent device node | |
373 | * @prop_name: Combination regulator supply name and "-supply" | |
374 | * | |
375 | * Traverse all child nodes. | |
376 | * Extract the child regulator device node corresponding to the supply name. | |
377 | * returns the device node corresponding to the regulator if found, else | |
378 | * returns NULL. | |
379 | */ | |
380 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
381 | const char *prop_name) | |
382 | { | |
383 | struct device_node *regnode = NULL; | |
384 | struct device_node *child = NULL; | |
385 | ||
386 | for_each_child_of_node(parent, child) { | |
387 | regnode = of_parse_phandle(child, prop_name, 0); | |
388 | ||
389 | if (!regnode) { | |
390 | regnode = of_get_child_regulator(child, prop_name); | |
391 | if (regnode) | |
392 | return regnode; | |
393 | } else { | |
394 | return regnode; | |
395 | } | |
396 | } | |
397 | return NULL; | |
398 | } | |
399 | ||
69511a45 RN |
400 | /** |
401 | * of_get_regulator - get a regulator device node based on supply name | |
402 | * @dev: Device pointer for the consumer (of regulator) device | |
403 | * @supply: regulator supply name | |
404 | * | |
405 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 406 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
407 | * returns NULL. |
408 | */ | |
409 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
410 | { | |
411 | struct device_node *regnode = NULL; | |
412 | char prop_name[32]; /* 32 is max size of property name */ | |
413 | ||
414 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
415 | ||
416 | snprintf(prop_name, 32, "%s-supply", supply); | |
417 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
418 | ||
419 | if (!regnode) { | |
fe06051d | 420 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
421 | if (regnode) | |
422 | return regnode; | |
423 | ||
7799167b RH |
424 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
425 | prop_name, dev->of_node); | |
69511a45 RN |
426 | return NULL; |
427 | } | |
428 | return regnode; | |
429 | } | |
430 | ||
414c70cb LG |
431 | /* Platform voltage constraint check */ |
432 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
433 | int *min_uV, int *max_uV) | |
434 | { | |
435 | BUG_ON(*min_uV > *max_uV); | |
436 | ||
8a34e979 | 437 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 438 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
439 | return -EPERM; |
440 | } | |
441 | ||
442 | if (*max_uV > rdev->constraints->max_uV) | |
443 | *max_uV = rdev->constraints->max_uV; | |
444 | if (*min_uV < rdev->constraints->min_uV) | |
445 | *min_uV = rdev->constraints->min_uV; | |
446 | ||
89f425ed MB |
447 | if (*min_uV > *max_uV) { |
448 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 449 | *min_uV, *max_uV); |
414c70cb | 450 | return -EINVAL; |
89f425ed | 451 | } |
414c70cb LG |
452 | |
453 | return 0; | |
454 | } | |
455 | ||
f7efad10 CZ |
456 | /* return 0 if the state is valid */ |
457 | static int regulator_check_states(suspend_state_t state) | |
458 | { | |
459 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
460 | } | |
461 | ||
05fda3b1 TP |
462 | /* Make sure we select a voltage that suits the needs of all |
463 | * regulator consumers | |
464 | */ | |
465 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
c360a6df CZ |
466 | int *min_uV, int *max_uV, |
467 | suspend_state_t state) | |
05fda3b1 TP |
468 | { |
469 | struct regulator *regulator; | |
c360a6df | 470 | struct regulator_voltage *voltage; |
05fda3b1 TP |
471 | |
472 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 473 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
474 | /* |
475 | * Assume consumers that didn't say anything are OK | |
476 | * with anything in the constraint range. | |
477 | */ | |
c360a6df | 478 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
479 | continue; |
480 | ||
c360a6df CZ |
481 | if (*max_uV > voltage->max_uV) |
482 | *max_uV = voltage->max_uV; | |
483 | if (*min_uV < voltage->min_uV) | |
484 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
485 | } |
486 | ||
dd8004af | 487 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
488 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
489 | *min_uV, *max_uV); | |
05fda3b1 | 490 | return -EINVAL; |
dd8004af | 491 | } |
05fda3b1 TP |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
414c70cb LG |
496 | /* current constraint check */ |
497 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
498 | int *min_uA, int *max_uA) | |
499 | { | |
500 | BUG_ON(*min_uA > *max_uA); | |
501 | ||
8a34e979 | 502 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 503 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
504 | return -EPERM; |
505 | } | |
506 | ||
507 | if (*max_uA > rdev->constraints->max_uA) | |
508 | *max_uA = rdev->constraints->max_uA; | |
509 | if (*min_uA < rdev->constraints->min_uA) | |
510 | *min_uA = rdev->constraints->min_uA; | |
511 | ||
89f425ed MB |
512 | if (*min_uA > *max_uA) { |
513 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 514 | *min_uA, *max_uA); |
414c70cb | 515 | return -EINVAL; |
89f425ed | 516 | } |
414c70cb LG |
517 | |
518 | return 0; | |
519 | } | |
520 | ||
521 | /* operating mode constraint check */ | |
109c75af CK |
522 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
523 | unsigned int *mode) | |
414c70cb | 524 | { |
2c608234 | 525 | switch (*mode) { |
e573520b DB |
526 | case REGULATOR_MODE_FAST: |
527 | case REGULATOR_MODE_NORMAL: | |
528 | case REGULATOR_MODE_IDLE: | |
529 | case REGULATOR_MODE_STANDBY: | |
530 | break; | |
531 | default: | |
89f425ed | 532 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
533 | return -EINVAL; |
534 | } | |
535 | ||
8a34e979 | 536 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 537 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
538 | return -EPERM; |
539 | } | |
2c608234 MB |
540 | |
541 | /* The modes are bitmasks, the most power hungry modes having | |
542 | * the lowest values. If the requested mode isn't supported | |
543 | * try higher modes. */ | |
544 | while (*mode) { | |
545 | if (rdev->constraints->valid_modes_mask & *mode) | |
546 | return 0; | |
547 | *mode /= 2; | |
414c70cb | 548 | } |
2c608234 MB |
549 | |
550 | return -EINVAL; | |
414c70cb LG |
551 | } |
552 | ||
f7efad10 CZ |
553 | static inline struct regulator_state * |
554 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
555 | { | |
556 | if (rdev->constraints == NULL) | |
557 | return NULL; | |
558 | ||
559 | switch (state) { | |
560 | case PM_SUSPEND_STANDBY: | |
561 | return &rdev->constraints->state_standby; | |
562 | case PM_SUSPEND_MEM: | |
563 | return &rdev->constraints->state_mem; | |
564 | case PM_SUSPEND_MAX: | |
565 | return &rdev->constraints->state_disk; | |
566 | default: | |
567 | return NULL; | |
568 | } | |
569 | } | |
570 | ||
414c70cb LG |
571 | static ssize_t regulator_uV_show(struct device *dev, |
572 | struct device_attribute *attr, char *buf) | |
573 | { | |
a5766f11 | 574 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
575 | ssize_t ret; |
576 | ||
66cf9a7e | 577 | regulator_lock(rdev); |
414c70cb | 578 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); |
66cf9a7e | 579 | regulator_unlock(rdev); |
414c70cb LG |
580 | |
581 | return ret; | |
582 | } | |
7ad68e2f | 583 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
584 | |
585 | static ssize_t regulator_uA_show(struct device *dev, | |
586 | struct device_attribute *attr, char *buf) | |
587 | { | |
a5766f11 | 588 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
589 | |
590 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
591 | } | |
7ad68e2f | 592 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 593 | |
587cea27 GKH |
594 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
595 | char *buf) | |
bc558a60 MB |
596 | { |
597 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 598 | |
1083c393 | 599 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 600 | } |
587cea27 | 601 | static DEVICE_ATTR_RO(name); |
bc558a60 | 602 | |
01de19d0 | 603 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 604 | { |
414c70cb LG |
605 | switch (mode) { |
606 | case REGULATOR_MODE_FAST: | |
01de19d0 | 607 | return "fast"; |
414c70cb | 608 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 609 | return "normal"; |
414c70cb | 610 | case REGULATOR_MODE_IDLE: |
01de19d0 | 611 | return "idle"; |
414c70cb | 612 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 613 | return "standby"; |
414c70cb | 614 | } |
01de19d0 DA |
615 | return "unknown"; |
616 | } | |
617 | ||
618 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
619 | { | |
620 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
621 | } |
622 | ||
4fca9545 DB |
623 | static ssize_t regulator_opmode_show(struct device *dev, |
624 | struct device_attribute *attr, char *buf) | |
414c70cb | 625 | { |
a5766f11 | 626 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 627 | |
4fca9545 DB |
628 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
629 | } | |
7ad68e2f | 630 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
631 | |
632 | static ssize_t regulator_print_state(char *buf, int state) | |
633 | { | |
414c70cb LG |
634 | if (state > 0) |
635 | return sprintf(buf, "enabled\n"); | |
636 | else if (state == 0) | |
637 | return sprintf(buf, "disabled\n"); | |
638 | else | |
639 | return sprintf(buf, "unknown\n"); | |
640 | } | |
641 | ||
4fca9545 DB |
642 | static ssize_t regulator_state_show(struct device *dev, |
643 | struct device_attribute *attr, char *buf) | |
644 | { | |
645 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
646 | ssize_t ret; |
647 | ||
66cf9a7e | 648 | regulator_lock(rdev); |
9332546f | 649 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 650 | regulator_unlock(rdev); |
4fca9545 | 651 | |
9332546f | 652 | return ret; |
4fca9545 | 653 | } |
7ad68e2f | 654 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 655 | |
853116a1 DB |
656 | static ssize_t regulator_status_show(struct device *dev, |
657 | struct device_attribute *attr, char *buf) | |
658 | { | |
659 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
660 | int status; | |
661 | char *label; | |
662 | ||
663 | status = rdev->desc->ops->get_status(rdev); | |
664 | if (status < 0) | |
665 | return status; | |
666 | ||
667 | switch (status) { | |
668 | case REGULATOR_STATUS_OFF: | |
669 | label = "off"; | |
670 | break; | |
671 | case REGULATOR_STATUS_ON: | |
672 | label = "on"; | |
673 | break; | |
674 | case REGULATOR_STATUS_ERROR: | |
675 | label = "error"; | |
676 | break; | |
677 | case REGULATOR_STATUS_FAST: | |
678 | label = "fast"; | |
679 | break; | |
680 | case REGULATOR_STATUS_NORMAL: | |
681 | label = "normal"; | |
682 | break; | |
683 | case REGULATOR_STATUS_IDLE: | |
684 | label = "idle"; | |
685 | break; | |
686 | case REGULATOR_STATUS_STANDBY: | |
687 | label = "standby"; | |
688 | break; | |
f59c8f9f MB |
689 | case REGULATOR_STATUS_BYPASS: |
690 | label = "bypass"; | |
691 | break; | |
1beaf762 KG |
692 | case REGULATOR_STATUS_UNDEFINED: |
693 | label = "undefined"; | |
694 | break; | |
853116a1 DB |
695 | default: |
696 | return -ERANGE; | |
697 | } | |
698 | ||
699 | return sprintf(buf, "%s\n", label); | |
700 | } | |
701 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
702 | ||
414c70cb LG |
703 | static ssize_t regulator_min_uA_show(struct device *dev, |
704 | struct device_attribute *attr, char *buf) | |
705 | { | |
a5766f11 | 706 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
707 | |
708 | if (!rdev->constraints) | |
709 | return sprintf(buf, "constraint not defined\n"); | |
710 | ||
711 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
712 | } | |
7ad68e2f | 713 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
714 | |
715 | static ssize_t regulator_max_uA_show(struct device *dev, | |
716 | struct device_attribute *attr, char *buf) | |
717 | { | |
a5766f11 | 718 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
719 | |
720 | if (!rdev->constraints) | |
721 | return sprintf(buf, "constraint not defined\n"); | |
722 | ||
723 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
724 | } | |
7ad68e2f | 725 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
726 | |
727 | static ssize_t regulator_min_uV_show(struct device *dev, | |
728 | struct device_attribute *attr, char *buf) | |
729 | { | |
a5766f11 | 730 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
731 | |
732 | if (!rdev->constraints) | |
733 | return sprintf(buf, "constraint not defined\n"); | |
734 | ||
735 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
736 | } | |
7ad68e2f | 737 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
738 | |
739 | static ssize_t regulator_max_uV_show(struct device *dev, | |
740 | struct device_attribute *attr, char *buf) | |
741 | { | |
a5766f11 | 742 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
743 | |
744 | if (!rdev->constraints) | |
745 | return sprintf(buf, "constraint not defined\n"); | |
746 | ||
747 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
748 | } | |
7ad68e2f | 749 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
750 | |
751 | static ssize_t regulator_total_uA_show(struct device *dev, | |
752 | struct device_attribute *attr, char *buf) | |
753 | { | |
a5766f11 | 754 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
755 | struct regulator *regulator; |
756 | int uA = 0; | |
757 | ||
66cf9a7e | 758 | regulator_lock(rdev); |
5451781d DA |
759 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
760 | if (regulator->enable_count) | |
761 | uA += regulator->uA_load; | |
762 | } | |
66cf9a7e | 763 | regulator_unlock(rdev); |
414c70cb LG |
764 | return sprintf(buf, "%d\n", uA); |
765 | } | |
7ad68e2f | 766 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 767 | |
587cea27 GKH |
768 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
769 | char *buf) | |
414c70cb | 770 | { |
a5766f11 | 771 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
772 | return sprintf(buf, "%d\n", rdev->use_count); |
773 | } | |
587cea27 | 774 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 775 | |
587cea27 GKH |
776 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
777 | char *buf) | |
414c70cb | 778 | { |
a5766f11 | 779 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
780 | |
781 | switch (rdev->desc->type) { | |
782 | case REGULATOR_VOLTAGE: | |
783 | return sprintf(buf, "voltage\n"); | |
784 | case REGULATOR_CURRENT: | |
785 | return sprintf(buf, "current\n"); | |
786 | } | |
787 | return sprintf(buf, "unknown\n"); | |
788 | } | |
587cea27 | 789 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
790 | |
791 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
792 | struct device_attribute *attr, char *buf) | |
793 | { | |
a5766f11 | 794 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 795 | |
414c70cb LG |
796 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
797 | } | |
7ad68e2f DB |
798 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
799 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
800 | |
801 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
802 | struct device_attribute *attr, char *buf) | |
803 | { | |
a5766f11 | 804 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 805 | |
414c70cb LG |
806 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
807 | } | |
7ad68e2f DB |
808 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
809 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
810 | |
811 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
812 | struct device_attribute *attr, char *buf) | |
813 | { | |
a5766f11 | 814 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 815 | |
414c70cb LG |
816 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
817 | } | |
7ad68e2f DB |
818 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
819 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 820 | |
414c70cb LG |
821 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
822 | struct device_attribute *attr, char *buf) | |
823 | { | |
a5766f11 | 824 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 825 | |
4fca9545 DB |
826 | return regulator_print_opmode(buf, |
827 | rdev->constraints->state_mem.mode); | |
414c70cb | 828 | } |
7ad68e2f DB |
829 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
830 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
831 | |
832 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
833 | struct device_attribute *attr, char *buf) | |
834 | { | |
a5766f11 | 835 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 836 | |
4fca9545 DB |
837 | return regulator_print_opmode(buf, |
838 | rdev->constraints->state_disk.mode); | |
414c70cb | 839 | } |
7ad68e2f DB |
840 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
841 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
842 | |
843 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
844 | struct device_attribute *attr, char *buf) | |
845 | { | |
a5766f11 | 846 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 847 | |
4fca9545 DB |
848 | return regulator_print_opmode(buf, |
849 | rdev->constraints->state_standby.mode); | |
414c70cb | 850 | } |
7ad68e2f DB |
851 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
852 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
853 | |
854 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
855 | struct device_attribute *attr, char *buf) | |
856 | { | |
a5766f11 | 857 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 858 | |
4fca9545 DB |
859 | return regulator_print_state(buf, |
860 | rdev->constraints->state_mem.enabled); | |
414c70cb | 861 | } |
7ad68e2f DB |
862 | static DEVICE_ATTR(suspend_mem_state, 0444, |
863 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
864 | |
865 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
866 | struct device_attribute *attr, char *buf) | |
867 | { | |
a5766f11 | 868 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 869 | |
4fca9545 DB |
870 | return regulator_print_state(buf, |
871 | rdev->constraints->state_disk.enabled); | |
414c70cb | 872 | } |
7ad68e2f DB |
873 | static DEVICE_ATTR(suspend_disk_state, 0444, |
874 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
875 | |
876 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
877 | struct device_attribute *attr, char *buf) | |
878 | { | |
a5766f11 | 879 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 880 | |
4fca9545 DB |
881 | return regulator_print_state(buf, |
882 | rdev->constraints->state_standby.enabled); | |
414c70cb | 883 | } |
7ad68e2f DB |
884 | static DEVICE_ATTR(suspend_standby_state, 0444, |
885 | regulator_suspend_standby_state_show, NULL); | |
886 | ||
f59c8f9f MB |
887 | static ssize_t regulator_bypass_show(struct device *dev, |
888 | struct device_attribute *attr, char *buf) | |
889 | { | |
890 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
891 | const char *report; | |
892 | bool bypass; | |
893 | int ret; | |
894 | ||
895 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
896 | ||
897 | if (ret != 0) | |
898 | report = "unknown"; | |
899 | else if (bypass) | |
900 | report = "enabled"; | |
901 | else | |
902 | report = "disabled"; | |
903 | ||
904 | return sprintf(buf, "%s\n", report); | |
905 | } | |
906 | static DEVICE_ATTR(bypass, 0444, | |
907 | regulator_bypass_show, NULL); | |
bc558a60 | 908 | |
414c70cb LG |
909 | /* Calculate the new optimum regulator operating mode based on the new total |
910 | * consumer load. All locks held by caller */ | |
8460ef38 | 911 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
912 | { |
913 | struct regulator *sibling; | |
914 | int current_uA = 0, output_uV, input_uV, err; | |
915 | unsigned int mode; | |
916 | ||
8460ef38 BA |
917 | /* |
918 | * first check to see if we can set modes at all, otherwise just | |
919 | * tell the consumer everything is OK. | |
920 | */ | |
74a569ee MG |
921 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
922 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 923 | return 0; |
74a569ee | 924 | } |
8460ef38 | 925 | |
8f4490e0 BA |
926 | if (!rdev->desc->ops->get_optimum_mode && |
927 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
928 | return 0; |
929 | ||
8f4490e0 BA |
930 | if (!rdev->desc->ops->set_mode && |
931 | !rdev->desc->ops->set_load) | |
8460ef38 | 932 | return -EINVAL; |
414c70cb | 933 | |
414c70cb | 934 | /* calc total requested load */ |
5451781d DA |
935 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
936 | if (sibling->enable_count) | |
937 | current_uA += sibling->uA_load; | |
938 | } | |
414c70cb | 939 | |
22a10bca SB |
940 | current_uA += rdev->constraints->system_load; |
941 | ||
8f4490e0 BA |
942 | if (rdev->desc->ops->set_load) { |
943 | /* set the optimum mode for our new total regulator load */ | |
944 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
945 | if (err < 0) | |
946 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
947 | } else { | |
57776617 JP |
948 | /* get output voltage */ |
949 | output_uV = _regulator_get_voltage(rdev); | |
950 | if (output_uV <= 0) { | |
951 | rdev_err(rdev, "invalid output voltage found\n"); | |
952 | return -EINVAL; | |
953 | } | |
954 | ||
955 | /* get input voltage */ | |
956 | input_uV = 0; | |
957 | if (rdev->supply) | |
958 | input_uV = regulator_get_voltage(rdev->supply); | |
959 | if (input_uV <= 0) | |
960 | input_uV = rdev->constraints->input_uV; | |
961 | if (input_uV <= 0) { | |
962 | rdev_err(rdev, "invalid input voltage found\n"); | |
963 | return -EINVAL; | |
964 | } | |
965 | ||
8f4490e0 BA |
966 | /* now get the optimum mode for our new total regulator load */ |
967 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
968 | output_uV, current_uA); | |
969 | ||
970 | /* check the new mode is allowed */ | |
971 | err = regulator_mode_constrain(rdev, &mode); | |
972 | if (err < 0) { | |
973 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
974 | current_uA, input_uV, output_uV); | |
975 | return err; | |
976 | } | |
414c70cb | 977 | |
8f4490e0 BA |
978 | err = rdev->desc->ops->set_mode(rdev, mode); |
979 | if (err < 0) | |
980 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
981 | } |
982 | ||
8460ef38 | 983 | return err; |
414c70cb LG |
984 | } |
985 | ||
986 | static int suspend_set_state(struct regulator_dev *rdev, | |
f7efad10 | 987 | suspend_state_t state) |
414c70cb LG |
988 | { |
989 | int ret = 0; | |
f7efad10 CZ |
990 | struct regulator_state *rstate; |
991 | ||
992 | rstate = regulator_get_suspend_state(rdev, state); | |
993 | if (rstate == NULL) | |
57a0dd18 | 994 | return 0; |
638f85c5 | 995 | |
48f1b4ef | 996 | /* If we have no suspend mode configuration don't set anything; |
8ac0e95d AL |
997 | * only warn if the driver implements set_suspend_voltage or |
998 | * set_suspend_mode callback. | |
638f85c5 | 999 | */ |
72069f99 CZ |
1000 | if (rstate->enabled != ENABLE_IN_SUSPEND && |
1001 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
8ac0e95d AL |
1002 | if (rdev->desc->ops->set_suspend_voltage || |
1003 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 1004 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
1005 | return 0; |
1006 | } | |
1007 | ||
72069f99 CZ |
1008 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1009 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1010 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1011 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1012 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1013 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1014 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1015 | ret = 0; | |
1016 | ||
414c70cb | 1017 | if (ret < 0) { |
5da84fd9 | 1018 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
1019 | return ret; |
1020 | } | |
1021 | ||
1022 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1023 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1024 | if (ret < 0) { | |
5da84fd9 | 1025 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
1026 | return ret; |
1027 | } | |
1028 | } | |
1029 | ||
1030 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1031 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1032 | if (ret < 0) { | |
5da84fd9 | 1033 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
1034 | return ret; |
1035 | } | |
1036 | } | |
414c70cb | 1037 | |
f7efad10 | 1038 | return ret; |
414c70cb LG |
1039 | } |
1040 | ||
1041 | static void print_constraints(struct regulator_dev *rdev) | |
1042 | { | |
1043 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1044 | char buf[160] = ""; |
5751a99f | 1045 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1046 | int count = 0; |
1047 | int ret; | |
414c70cb | 1048 | |
8f031b48 | 1049 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1050 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1051 | count += scnprintf(buf + count, len - count, "%d mV ", |
1052 | constraints->min_uV / 1000); | |
414c70cb | 1053 | else |
5751a99f SW |
1054 | count += scnprintf(buf + count, len - count, |
1055 | "%d <--> %d mV ", | |
1056 | constraints->min_uV / 1000, | |
1057 | constraints->max_uV / 1000); | |
8f031b48 MB |
1058 | } |
1059 | ||
1060 | if (!constraints->min_uV || | |
1061 | constraints->min_uV != constraints->max_uV) { | |
1062 | ret = _regulator_get_voltage(rdev); | |
1063 | if (ret > 0) | |
5751a99f SW |
1064 | count += scnprintf(buf + count, len - count, |
1065 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1066 | } |
1067 | ||
bf5892a8 | 1068 | if (constraints->uV_offset) |
5751a99f SW |
1069 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1070 | constraints->uV_offset / 1000); | |
bf5892a8 | 1071 | |
8f031b48 | 1072 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1073 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1074 | count += scnprintf(buf + count, len - count, "%d mA ", |
1075 | constraints->min_uA / 1000); | |
414c70cb | 1076 | else |
5751a99f SW |
1077 | count += scnprintf(buf + count, len - count, |
1078 | "%d <--> %d mA ", | |
1079 | constraints->min_uA / 1000, | |
1080 | constraints->max_uA / 1000); | |
8f031b48 MB |
1081 | } |
1082 | ||
1083 | if (!constraints->min_uA || | |
1084 | constraints->min_uA != constraints->max_uA) { | |
1085 | ret = _regulator_get_current_limit(rdev); | |
1086 | if (ret > 0) | |
5751a99f SW |
1087 | count += scnprintf(buf + count, len - count, |
1088 | "at %d mA ", ret / 1000); | |
414c70cb | 1089 | } |
8f031b48 | 1090 | |
414c70cb | 1091 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1092 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1093 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1094 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1095 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1096 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1097 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 1098 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 1099 | |
215b8b05 | 1100 | if (!count) |
5751a99f | 1101 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 1102 | |
194dbaef | 1103 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
1104 | |
1105 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1106 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1107 | rdev_warn(rdev, |
1108 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1109 | } |
1110 | ||
e79055d6 | 1111 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1112 | struct regulation_constraints *constraints) |
a5766f11 | 1113 | { |
272e2315 | 1114 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1115 | int ret; |
1116 | ||
1117 | /* do we need to apply the constraint voltage */ | |
1118 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1119 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1120 | int target_min, target_max; | |
064d5cd1 | 1121 | int current_uV = _regulator_get_voltage(rdev); |
84b3a7c9 DA |
1122 | |
1123 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1124 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1125 | rdev_info(rdev, "Setting %d-%duV\n", |
1126 | rdev->constraints->min_uV, | |
1127 | rdev->constraints->max_uV); | |
1128 | _regulator_do_set_voltage(rdev, | |
1129 | rdev->constraints->min_uV, | |
1130 | rdev->constraints->max_uV); | |
1131 | current_uV = _regulator_get_voltage(rdev); | |
1132 | } | |
1133 | ||
064d5cd1 | 1134 | if (current_uV < 0) { |
69d58839 NM |
1135 | rdev_err(rdev, |
1136 | "failed to get the current voltage(%d)\n", | |
1137 | current_uV); | |
064d5cd1 AB |
1138 | return current_uV; |
1139 | } | |
fa93fd4e MB |
1140 | |
1141 | /* | |
1142 | * If we're below the minimum voltage move up to the | |
1143 | * minimum voltage, if we're above the maximum voltage | |
1144 | * then move down to the maximum. | |
1145 | */ | |
1146 | target_min = current_uV; | |
1147 | target_max = current_uV; | |
1148 | ||
1149 | if (current_uV < rdev->constraints->min_uV) { | |
1150 | target_min = rdev->constraints->min_uV; | |
1151 | target_max = rdev->constraints->min_uV; | |
1152 | } | |
1153 | ||
1154 | if (current_uV > rdev->constraints->max_uV) { | |
1155 | target_min = rdev->constraints->max_uV; | |
1156 | target_max = rdev->constraints->max_uV; | |
1157 | } | |
1158 | ||
1159 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1160 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1161 | current_uV, target_min, target_max); | |
064d5cd1 | 1162 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1163 | rdev, target_min, target_max); |
064d5cd1 AB |
1164 | if (ret < 0) { |
1165 | rdev_err(rdev, | |
fa93fd4e MB |
1166 | "failed to apply %d-%duV constraint(%d)\n", |
1167 | target_min, target_max, ret); | |
064d5cd1 AB |
1168 | return ret; |
1169 | } | |
75790251 | 1170 | } |
af5866c9 | 1171 | } |
e06f5b4f | 1172 | |
4367cfdc DB |
1173 | /* constrain machine-level voltage specs to fit |
1174 | * the actual range supported by this regulator. | |
1175 | */ | |
1176 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1177 | int count = rdev->desc->n_voltages; | |
1178 | int i; | |
1179 | int min_uV = INT_MAX; | |
1180 | int max_uV = INT_MIN; | |
1181 | int cmin = constraints->min_uV; | |
1182 | int cmax = constraints->max_uV; | |
1183 | ||
3e590918 MB |
1184 | /* it's safe to autoconfigure fixed-voltage supplies |
1185 | and the constraints are used by list_voltage. */ | |
4367cfdc | 1186 | if (count == 1 && !cmin) { |
3e590918 | 1187 | cmin = 1; |
4367cfdc | 1188 | cmax = INT_MAX; |
3e590918 MB |
1189 | constraints->min_uV = cmin; |
1190 | constraints->max_uV = cmax; | |
4367cfdc DB |
1191 | } |
1192 | ||
3e2b9abd MB |
1193 | /* voltage constraints are optional */ |
1194 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1195 | return 0; |
3e2b9abd | 1196 | |
4367cfdc | 1197 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1198 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1199 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1200 | return -EINVAL; |
4367cfdc DB |
1201 | } |
1202 | ||
1203 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
1204 | for (i = 0; i < count; i++) { | |
1205 | int value; | |
1206 | ||
1207 | value = ops->list_voltage(rdev, i); | |
1208 | if (value <= 0) | |
1209 | continue; | |
1210 | ||
1211 | /* maybe adjust [min_uV..max_uV] */ | |
1212 | if (value >= cmin && value < min_uV) | |
1213 | min_uV = value; | |
1214 | if (value <= cmax && value > max_uV) | |
1215 | max_uV = value; | |
1216 | } | |
1217 | ||
1218 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1219 | if (max_uV < min_uV) { | |
fff15bef MB |
1220 | rdev_err(rdev, |
1221 | "unsupportable voltage constraints %u-%uuV\n", | |
1222 | min_uV, max_uV); | |
e79055d6 | 1223 | return -EINVAL; |
4367cfdc DB |
1224 | } |
1225 | ||
1226 | /* use regulator's subset of machine constraints */ | |
1227 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1228 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1229 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1230 | constraints->min_uV = min_uV; |
1231 | } | |
1232 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1233 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1234 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1235 | constraints->max_uV = max_uV; |
1236 | } | |
1237 | } | |
1238 | ||
e79055d6 MB |
1239 | return 0; |
1240 | } | |
1241 | ||
f8c1700d LD |
1242 | static int machine_constraints_current(struct regulator_dev *rdev, |
1243 | struct regulation_constraints *constraints) | |
1244 | { | |
272e2315 | 1245 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1246 | int ret; |
1247 | ||
1248 | if (!constraints->min_uA && !constraints->max_uA) | |
1249 | return 0; | |
1250 | ||
1251 | if (constraints->min_uA > constraints->max_uA) { | |
1252 | rdev_err(rdev, "Invalid current constraints\n"); | |
1253 | return -EINVAL; | |
1254 | } | |
1255 | ||
1256 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1257 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /* Set regulator current in constraints range */ | |
1262 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1263 | constraints->max_uA); | |
1264 | if (ret < 0) { | |
1265 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
30c21971 MP |
1272 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1273 | ||
e79055d6 MB |
1274 | /** |
1275 | * set_machine_constraints - sets regulator constraints | |
1276 | * @rdev: regulator source | |
1277 | * @constraints: constraints to apply | |
1278 | * | |
1279 | * Allows platform initialisation code to define and constrain | |
1280 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1281 | * Constraints *must* be set by platform code in order for some | |
1282 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1283 | * set_mode. | |
1284 | */ | |
1285 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1286 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1287 | { |
1288 | int ret = 0; | |
272e2315 | 1289 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1290 | |
9a8f5e07 MB |
1291 | if (constraints) |
1292 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1293 | GFP_KERNEL); | |
1294 | else | |
1295 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1296 | GFP_KERNEL); | |
f8c12fe3 MB |
1297 | if (!rdev->constraints) |
1298 | return -ENOMEM; | |
af5866c9 | 1299 | |
f8c12fe3 | 1300 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1301 | if (ret != 0) |
6333ef46 | 1302 | return ret; |
e79055d6 | 1303 | |
f8c1700d | 1304 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1305 | if (ret != 0) |
6333ef46 | 1306 | return ret; |
e79055d6 | 1307 | |
36e4f839 SB |
1308 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1309 | ret = ops->set_input_current_limit(rdev, | |
1310 | rdev->constraints->ilim_uA); | |
1311 | if (ret < 0) { | |
1312 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1313 | return ret; |
36e4f839 SB |
1314 | } |
1315 | } | |
1316 | ||
a5766f11 | 1317 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1318 | if (rdev->constraints->initial_state) { |
f7efad10 | 1319 | ret = suspend_set_state(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1320 | if (ret < 0) { |
5da84fd9 | 1321 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1322 | return ret; |
e06f5b4f MB |
1323 | } |
1324 | } | |
a5766f11 | 1325 | |
9a8f5e07 | 1326 | if (rdev->constraints->initial_mode) { |
a308466c | 1327 | if (!ops->set_mode) { |
5da84fd9 | 1328 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1329 | return -EINVAL; |
a308466c MB |
1330 | } |
1331 | ||
f8c12fe3 | 1332 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1333 | if (ret < 0) { |
5da84fd9 | 1334 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1335 | return ret; |
a308466c | 1336 | } |
fa94e48e DA |
1337 | } else if (rdev->constraints->system_load) { |
1338 | /* | |
1339 | * We'll only apply the initial system load if an | |
1340 | * initial mode wasn't specified. | |
1341 | */ | |
e5e21f70 | 1342 | regulator_lock(rdev); |
fa94e48e | 1343 | drms_uA_update(rdev); |
e5e21f70 | 1344 | regulator_unlock(rdev); |
a308466c MB |
1345 | } |
1346 | ||
1653ccf4 YSB |
1347 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1348 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1349 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1350 | if (ret < 0) { | |
1351 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1352 | return ret; |
6f0b2c69 YSB |
1353 | } |
1354 | } | |
1355 | ||
23c779b9 SB |
1356 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1357 | ret = ops->set_pull_down(rdev); | |
1358 | if (ret < 0) { | |
1359 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1360 | return ret; |
23c779b9 SB |
1361 | } |
1362 | } | |
1363 | ||
57f66b78 SB |
1364 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1365 | ret = ops->set_soft_start(rdev); | |
1366 | if (ret < 0) { | |
1367 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1368 | return ret; |
57f66b78 SB |
1369 | } |
1370 | } | |
1371 | ||
3a003bae SB |
1372 | if (rdev->constraints->over_current_protection |
1373 | && ops->set_over_current_protection) { | |
1374 | ret = ops->set_over_current_protection(rdev); | |
1375 | if (ret < 0) { | |
1376 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1377 | return ret; |
3a003bae SB |
1378 | } |
1379 | } | |
1380 | ||
670666b9 LD |
1381 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1382 | bool ad_state = (rdev->constraints->active_discharge == | |
1383 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1384 | ||
1385 | ret = ops->set_active_discharge(rdev, ad_state); | |
1386 | if (ret < 0) { | |
1387 | rdev_err(rdev, "failed to set active discharge\n"); | |
1388 | return ret; | |
1389 | } | |
1390 | } | |
1391 | ||
2bb16663 OS |
1392 | /* If the constraints say the regulator should be on at this point |
1393 | * and we have control then make sure it is enabled. | |
1394 | */ | |
1395 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
05f224ca DA |
1396 | if (rdev->supply) { |
1397 | ret = regulator_enable(rdev->supply); | |
1398 | if (ret < 0) { | |
1399 | _regulator_put(rdev->supply); | |
1400 | rdev->supply = NULL; | |
1401 | return ret; | |
1402 | } | |
1403 | } | |
1404 | ||
2bb16663 OS |
1405 | ret = _regulator_do_enable(rdev); |
1406 | if (ret < 0 && ret != -EINVAL) { | |
1407 | rdev_err(rdev, "failed to enable\n"); | |
1408 | return ret; | |
1409 | } | |
05f224ca | 1410 | rdev->use_count++; |
2bb16663 OS |
1411 | } |
1412 | ||
a5766f11 | 1413 | print_constraints(rdev); |
1a6958e7 | 1414 | return 0; |
a5766f11 LG |
1415 | } |
1416 | ||
1417 | /** | |
1418 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1419 | * @rdev: regulator name |
1420 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1421 | * |
1422 | * Called by platform initialisation code to set the supply regulator for this | |
1423 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1424 | * core if it's child is enabled. | |
1425 | */ | |
1426 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1427 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1428 | { |
1429 | int err; | |
1430 | ||
3801b86a MB |
1431 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1432 | ||
e2c09ae7 JMC |
1433 | if (!try_module_get(supply_rdev->owner)) |
1434 | return -ENODEV; | |
1435 | ||
3801b86a | 1436 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1437 | if (rdev->supply == NULL) { |
1438 | err = -ENOMEM; | |
3801b86a | 1439 | return err; |
a5766f11 | 1440 | } |
57ad526a | 1441 | supply_rdev->open_count++; |
3801b86a MB |
1442 | |
1443 | return 0; | |
a5766f11 LG |
1444 | } |
1445 | ||
1446 | /** | |
06c63f93 | 1447 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1448 | * @rdev: regulator source |
40f9244f | 1449 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1450 | * @supply: symbolic name for supply |
a5766f11 LG |
1451 | * |
1452 | * Allows platform initialisation code to map physical regulator | |
1453 | * sources to symbolic names for supplies for use by devices. Devices | |
1454 | * should use these symbolic names to request regulators, avoiding the | |
1455 | * need to provide board-specific regulator names as platform data. | |
1456 | */ | |
1457 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1458 | const char *consumer_dev_name, |
1459 | const char *supply) | |
a5766f11 LG |
1460 | { |
1461 | struct regulator_map *node; | |
9ed2099e | 1462 | int has_dev; |
a5766f11 LG |
1463 | |
1464 | if (supply == NULL) | |
1465 | return -EINVAL; | |
1466 | ||
9ed2099e MB |
1467 | if (consumer_dev_name != NULL) |
1468 | has_dev = 1; | |
1469 | else | |
1470 | has_dev = 0; | |
1471 | ||
6001e13c | 1472 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1473 | if (node->dev_name && consumer_dev_name) { |
1474 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1475 | continue; | |
1476 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1477 | continue; |
23b5cc2a JN |
1478 | } |
1479 | ||
6001e13c DB |
1480 | if (strcmp(node->supply, supply) != 0) |
1481 | continue; | |
1482 | ||
737f360d MB |
1483 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1484 | consumer_dev_name, | |
1485 | dev_name(&node->regulator->dev), | |
1486 | node->regulator->desc->name, | |
1487 | supply, | |
1488 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1489 | return -EBUSY; |
1490 | } | |
1491 | ||
9ed2099e | 1492 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1493 | if (node == NULL) |
1494 | return -ENOMEM; | |
1495 | ||
1496 | node->regulator = rdev; | |
a5766f11 LG |
1497 | node->supply = supply; |
1498 | ||
9ed2099e MB |
1499 | if (has_dev) { |
1500 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1501 | if (node->dev_name == NULL) { | |
1502 | kfree(node); | |
1503 | return -ENOMEM; | |
1504 | } | |
40f9244f MB |
1505 | } |
1506 | ||
a5766f11 LG |
1507 | list_add(&node->list, ®ulator_map_list); |
1508 | return 0; | |
1509 | } | |
1510 | ||
0f1d747b MR |
1511 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1512 | { | |
1513 | struct regulator_map *node, *n; | |
1514 | ||
1515 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1516 | if (rdev == node->regulator) { | |
1517 | list_del(&node->list); | |
40f9244f | 1518 | kfree(node->dev_name); |
0f1d747b | 1519 | kfree(node); |
0f1d747b MR |
1520 | } |
1521 | } | |
1522 | } | |
1523 | ||
2d80a91b RF |
1524 | #ifdef CONFIG_DEBUG_FS |
1525 | static ssize_t constraint_flags_read_file(struct file *file, | |
1526 | char __user *user_buf, | |
1527 | size_t count, loff_t *ppos) | |
1528 | { | |
1529 | const struct regulator *regulator = file->private_data; | |
1530 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1531 | char *buf; | |
1532 | ssize_t ret; | |
1533 | ||
1534 | if (!c) | |
1535 | return 0; | |
1536 | ||
1537 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1538 | if (!buf) | |
1539 | return -ENOMEM; | |
1540 | ||
1541 | ret = snprintf(buf, PAGE_SIZE, | |
1542 | "always_on: %u\n" | |
1543 | "boot_on: %u\n" | |
1544 | "apply_uV: %u\n" | |
1545 | "ramp_disable: %u\n" | |
1546 | "soft_start: %u\n" | |
1547 | "pull_down: %u\n" | |
1548 | "over_current_protection: %u\n", | |
1549 | c->always_on, | |
1550 | c->boot_on, | |
1551 | c->apply_uV, | |
1552 | c->ramp_disable, | |
1553 | c->soft_start, | |
1554 | c->pull_down, | |
1555 | c->over_current_protection); | |
1556 | ||
1557 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1558 | kfree(buf); | |
1559 | ||
1560 | return ret; | |
1561 | } | |
1562 | ||
1563 | #endif | |
1564 | ||
1565 | static const struct file_operations constraint_flags_fops = { | |
1566 | #ifdef CONFIG_DEBUG_FS | |
1567 | .open = simple_open, | |
1568 | .read = constraint_flags_read_file, | |
1569 | .llseek = default_llseek, | |
1570 | #endif | |
1571 | }; | |
1572 | ||
f5726ae3 | 1573 | #define REG_STR_SIZE 64 |
414c70cb LG |
1574 | |
1575 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1576 | struct device *dev, | |
1577 | const char *supply_name) | |
1578 | { | |
1579 | struct regulator *regulator; | |
1580 | char buf[REG_STR_SIZE]; | |
1581 | int err, size; | |
1582 | ||
1583 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1584 | if (regulator == NULL) | |
1585 | return NULL; | |
1586 | ||
66cf9a7e | 1587 | regulator_lock(rdev); |
414c70cb LG |
1588 | regulator->rdev = rdev; |
1589 | list_add(®ulator->list, &rdev->consumer_list); | |
1590 | ||
1591 | if (dev) { | |
e2c98eaf SG |
1592 | regulator->dev = dev; |
1593 | ||
222cc7b1 | 1594 | /* Add a link to the device sysfs entry */ |
b7cd1b13 BG |
1595 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", |
1596 | dev->kobj.name, supply_name); | |
414c70cb | 1597 | if (size >= REG_STR_SIZE) |
222cc7b1 | 1598 | goto overflow_err; |
414c70cb LG |
1599 | |
1600 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1601 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1602 | goto overflow_err; |
414c70cb | 1603 | |
ff268b56 | 1604 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1605 | buf); |
1606 | if (err) { | |
ff268b56 | 1607 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1608 | dev->kobj.name, err); |
222cc7b1 | 1609 | /* non-fatal */ |
414c70cb | 1610 | } |
5de70519 | 1611 | } else { |
0630b614 | 1612 | regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL); |
5de70519 | 1613 | if (regulator->supply_name == NULL) |
222cc7b1 | 1614 | goto overflow_err; |
5de70519 MB |
1615 | } |
1616 | ||
5de70519 MB |
1617 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1618 | rdev->debugfs); | |
24751434 | 1619 | if (!regulator->debugfs) { |
ad3a942b | 1620 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1621 | } else { |
1622 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1623 | ®ulator->uA_load); | |
1624 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1625 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1626 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1627 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1628 | debugfs_create_file("constraint_flags", 0444, |
1629 | regulator->debugfs, regulator, | |
1630 | &constraint_flags_fops); | |
414c70cb | 1631 | } |
5de70519 | 1632 | |
6492bc1b MB |
1633 | /* |
1634 | * Check now if the regulator is an always on regulator - if | |
1635 | * it is then we don't need to do nearly so much work for | |
1636 | * enable/disable calls. | |
1637 | */ | |
8a34e979 | 1638 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1639 | _regulator_is_enabled(rdev)) |
1640 | regulator->always_on = true; | |
1641 | ||
66cf9a7e | 1642 | regulator_unlock(rdev); |
414c70cb | 1643 | return regulator; |
414c70cb LG |
1644 | overflow_err: |
1645 | list_del(®ulator->list); | |
1646 | kfree(regulator); | |
66cf9a7e | 1647 | regulator_unlock(rdev); |
414c70cb LG |
1648 | return NULL; |
1649 | } | |
1650 | ||
31aae2be MB |
1651 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1652 | { | |
00c877c6 LD |
1653 | if (rdev->constraints && rdev->constraints->enable_time) |
1654 | return rdev->constraints->enable_time; | |
31aae2be | 1655 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1656 | return rdev->desc->enable_time; |
31aae2be MB |
1657 | return rdev->desc->ops->enable_time(rdev); |
1658 | } | |
1659 | ||
a06ccd9c CK |
1660 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1661 | struct device *dev, const char *supply) | |
1662 | { | |
1663 | struct regulator_supply_alias *map; | |
1664 | ||
1665 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1666 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1667 | return map; | |
1668 | ||
1669 | return NULL; | |
1670 | } | |
1671 | ||
1672 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1673 | { | |
1674 | struct regulator_supply_alias *map; | |
1675 | ||
1676 | map = regulator_find_supply_alias(*dev, *supply); | |
1677 | if (map) { | |
1678 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1679 | *supply, map->alias_supply, | |
1680 | dev_name(map->alias_dev)); | |
1681 | *dev = map->alias_dev; | |
1682 | *supply = map->alias_supply; | |
1683 | } | |
1684 | } | |
1685 | ||
85f3b431 TV |
1686 | static int regulator_match(struct device *dev, const void *data) |
1687 | { | |
1688 | struct regulator_dev *r = dev_to_rdev(dev); | |
1689 | ||
1690 | return strcmp(rdev_get_name(r), data) == 0; | |
1691 | } | |
1692 | ||
1693 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1694 | { | |
1695 | struct device *dev; | |
1696 | ||
1697 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1698 | ||
1699 | return dev ? dev_to_rdev(dev) : NULL; | |
1700 | } | |
1701 | ||
1702 | /** | |
1703 | * regulator_dev_lookup - lookup a regulator device. | |
1704 | * @dev: device for regulator "consumer". | |
1705 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1706 | * |
1707 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1708 | * @supply and with the embedded struct device refcount incremented by one. |
1709 | * The refcount must be dropped by calling put_device(). | |
1710 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1711 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1712 | * in the future. | |
85f3b431 | 1713 | */ |
69511a45 | 1714 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1715 | const char *supply) |
69511a45 | 1716 | { |
06217197 | 1717 | struct regulator_dev *r = NULL; |
69511a45 | 1718 | struct device_node *node; |
576ca436 MB |
1719 | struct regulator_map *map; |
1720 | const char *devname = NULL; | |
69511a45 | 1721 | |
a06ccd9c CK |
1722 | regulator_supply_alias(&dev, &supply); |
1723 | ||
69511a45 RN |
1724 | /* first do a dt based lookup */ |
1725 | if (dev && dev->of_node) { | |
1726 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1727 | if (node) { |
85f3b431 TV |
1728 | r = of_find_regulator_by_node(node); |
1729 | if (r) | |
1730 | return r; | |
163478da | 1731 | |
6d191a5f | 1732 | /* |
163478da DT |
1733 | * We have a node, but there is no device. |
1734 | * assume it has not registered yet. | |
6d191a5f | 1735 | */ |
163478da | 1736 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1737 | } |
69511a45 RN |
1738 | } |
1739 | ||
1740 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1741 | if (dev) |
1742 | devname = dev_name(dev); | |
1743 | ||
85f3b431 | 1744 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1745 | list_for_each_entry(map, ®ulator_map_list, list) { |
1746 | /* If the mapping has a device set up it must match */ | |
1747 | if (map->dev_name && | |
1748 | (!devname || strcmp(map->dev_name, devname))) | |
1749 | continue; | |
1750 | ||
85f3b431 TV |
1751 | if (strcmp(map->supply, supply) == 0 && |
1752 | get_device(&map->regulator->dev)) { | |
163478da DT |
1753 | r = map->regulator; |
1754 | break; | |
85f3b431 | 1755 | } |
576ca436 | 1756 | } |
85f3b431 | 1757 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1758 | |
06217197 CK |
1759 | if (r) |
1760 | return r; | |
1761 | ||
1762 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1763 | if (r) |
1764 | return r; | |
1765 | ||
1766 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1767 | } |
1768 | ||
6261b06d BA |
1769 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1770 | { | |
1771 | struct regulator_dev *r; | |
1772 | struct device *dev = rdev->dev.parent; | |
1773 | int ret; | |
1774 | ||
48f1b4ef | 1775 | /* No supply to resolve? */ |
6261b06d BA |
1776 | if (!rdev->supply_name) |
1777 | return 0; | |
1778 | ||
1779 | /* Supply already resolved? */ | |
1780 | if (rdev->supply) | |
1781 | return 0; | |
1782 | ||
163478da DT |
1783 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1784 | if (IS_ERR(r)) { | |
1785 | ret = PTR_ERR(r); | |
1786 | ||
06423121 MB |
1787 | /* Did the lookup explicitly defer for us? */ |
1788 | if (ret == -EPROBE_DEFER) | |
1789 | return ret; | |
1790 | ||
9f7e25ed MB |
1791 | if (have_full_constraints()) { |
1792 | r = dummy_regulator_rdev; | |
85f3b431 | 1793 | get_device(&r->dev); |
9f7e25ed MB |
1794 | } else { |
1795 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1796 | rdev->supply_name, rdev->desc->name); | |
1797 | return -EPROBE_DEFER; | |
1798 | } | |
6261b06d BA |
1799 | } |
1800 | ||
66d228a2 JH |
1801 | /* |
1802 | * If the supply's parent device is not the same as the | |
1803 | * regulator's parent device, then ensure the parent device | |
1804 | * is bound before we resolve the supply, in case the parent | |
1805 | * device get probe deferred and unregisters the supply. | |
1806 | */ | |
1807 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1808 | if (!device_is_bound(r->dev.parent)) { | |
1809 | put_device(&r->dev); | |
1810 | return -EPROBE_DEFER; | |
1811 | } | |
1812 | } | |
1813 | ||
6261b06d BA |
1814 | /* Recursively resolve the supply of the supply */ |
1815 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1816 | if (ret < 0) { |
1817 | put_device(&r->dev); | |
6261b06d | 1818 | return ret; |
85f3b431 | 1819 | } |
6261b06d BA |
1820 | |
1821 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1822 | if (ret < 0) { |
1823 | put_device(&r->dev); | |
6261b06d | 1824 | return ret; |
85f3b431 | 1825 | } |
6261b06d | 1826 | |
05f224ca DA |
1827 | /* |
1828 | * In set_machine_constraints() we may have turned this regulator on | |
1829 | * but we couldn't propagate to the supply if it hadn't been resolved | |
1830 | * yet. Do it now. | |
1831 | */ | |
1832 | if (rdev->use_count) { | |
6261b06d | 1833 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1834 | if (ret < 0) { |
9f8df6ad | 1835 | _regulator_put(rdev->supply); |
8e5356a7 | 1836 | rdev->supply = NULL; |
6261b06d | 1837 | return ret; |
36a1f1b6 | 1838 | } |
6261b06d BA |
1839 | } |
1840 | ||
1841 | return 0; | |
1842 | } | |
1843 | ||
5ffbd136 | 1844 | /* Internal regulator request function */ |
a8bd42a9 DT |
1845 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1846 | enum regulator_get_type get_type) | |
414c70cb LG |
1847 | { |
1848 | struct regulator_dev *rdev; | |
7d245afa | 1849 | struct regulator *regulator; |
a4d7641f | 1850 | const char *devname = dev ? dev_name(dev) : "deviceless"; |
317b5684 | 1851 | int ret; |
414c70cb | 1852 | |
a8bd42a9 DT |
1853 | if (get_type >= MAX_GET_TYPE) { |
1854 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1855 | return ERR_PTR(-EINVAL); | |
1856 | } | |
1857 | ||
414c70cb | 1858 | if (id == NULL) { |
5da84fd9 | 1859 | pr_err("get() with no identifier\n"); |
043c998f | 1860 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1861 | } |
1862 | ||
163478da | 1863 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1864 | if (IS_ERR(rdev)) { |
1865 | ret = PTR_ERR(rdev); | |
1e4b545c | 1866 | |
a4d7641f DT |
1867 | /* |
1868 | * If regulator_dev_lookup() fails with error other | |
1869 | * than -ENODEV our job here is done, we simply return it. | |
1870 | */ | |
1871 | if (ret != -ENODEV) | |
1872 | return ERR_PTR(ret); | |
34abbd68 | 1873 | |
a4d7641f DT |
1874 | if (!have_full_constraints()) { |
1875 | dev_warn(dev, | |
1876 | "incomplete constraints, dummy supplies not allowed\n"); | |
1877 | return ERR_PTR(-ENODEV); | |
1878 | } | |
4ddfebd3 | 1879 | |
a4d7641f DT |
1880 | switch (get_type) { |
1881 | case NORMAL_GET: | |
1882 | /* | |
1883 | * Assume that a regulator is physically present and | |
1884 | * enabled, even if it isn't hooked up, and just | |
1885 | * provide a dummy. | |
1886 | */ | |
1887 | dev_warn(dev, | |
1888 | "%s supply %s not found, using dummy regulator\n", | |
1889 | devname, id); | |
1890 | rdev = dummy_regulator_rdev; | |
1891 | get_device(&rdev->dev); | |
1892 | break; | |
34abbd68 | 1893 | |
a4d7641f DT |
1894 | case EXCLUSIVE_GET: |
1895 | dev_warn(dev, | |
1896 | "dummy supplies not allowed for exclusive requests\n"); | |
1897 | /* fall through */ | |
34abbd68 | 1898 | |
a4d7641f DT |
1899 | default: |
1900 | return ERR_PTR(-ENODEV); | |
1901 | } | |
34abbd68 | 1902 | } |
34abbd68 | 1903 | |
5ffbd136 MB |
1904 | if (rdev->exclusive) { |
1905 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1906 | put_device(&rdev->dev); |
1907 | return regulator; | |
5ffbd136 MB |
1908 | } |
1909 | ||
a8bd42a9 | 1910 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1911 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1912 | put_device(&rdev->dev); |
1913 | return regulator; | |
5ffbd136 MB |
1914 | } |
1915 | ||
79d6f049 DO |
1916 | mutex_lock(®ulator_list_mutex); |
1917 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1918 | mutex_unlock(®ulator_list_mutex); | |
1919 | ||
1920 | if (ret != 0) { | |
1921 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1922 | put_device(&rdev->dev); | |
1923 | return regulator; | |
1924 | } | |
1925 | ||
6261b06d BA |
1926 | ret = regulator_resolve_supply(rdev); |
1927 | if (ret < 0) { | |
1928 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1929 | put_device(&rdev->dev); |
1930 | return regulator; | |
6261b06d BA |
1931 | } |
1932 | ||
85f3b431 | 1933 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1934 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1935 | put_device(&rdev->dev); |
1936 | return regulator; | |
1937 | } | |
a5766f11 | 1938 | |
414c70cb LG |
1939 | regulator = create_regulator(rdev, dev, id); |
1940 | if (regulator == NULL) { | |
1941 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1942 | put_device(&rdev->dev); |
414c70cb | 1943 | module_put(rdev->owner); |
85f3b431 | 1944 | return regulator; |
414c70cb LG |
1945 | } |
1946 | ||
5ffbd136 | 1947 | rdev->open_count++; |
a8bd42a9 | 1948 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1949 | rdev->exclusive = 1; |
1950 | ||
1951 | ret = _regulator_is_enabled(rdev); | |
1952 | if (ret > 0) | |
1953 | rdev->use_count = 1; | |
1954 | else | |
1955 | rdev->use_count = 0; | |
1956 | } | |
1957 | ||
ed1ae2dd | 1958 | device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
1959 | ||
414c70cb LG |
1960 | return regulator; |
1961 | } | |
5ffbd136 MB |
1962 | |
1963 | /** | |
1964 | * regulator_get - lookup and obtain a reference to a regulator. | |
1965 | * @dev: device for regulator "consumer" | |
1966 | * @id: Supply name or regulator ID. | |
1967 | * | |
1968 | * Returns a struct regulator corresponding to the regulator producer, | |
1969 | * or IS_ERR() condition containing errno. | |
1970 | * | |
1971 | * Use of supply names configured via regulator_set_device_supply() is | |
1972 | * strongly encouraged. It is recommended that the supply name used | |
1973 | * should match the name used for the supply and/or the relevant | |
1974 | * device pins in the datasheet. | |
1975 | */ | |
1976 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1977 | { | |
a8bd42a9 | 1978 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 1979 | } |
414c70cb LG |
1980 | EXPORT_SYMBOL_GPL(regulator_get); |
1981 | ||
5ffbd136 MB |
1982 | /** |
1983 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1984 | * @dev: device for regulator "consumer" | |
1985 | * @id: Supply name or regulator ID. | |
1986 | * | |
1987 | * Returns a struct regulator corresponding to the regulator producer, | |
1988 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1989 | * unable to obtain this regulator while this reference is held and the |
1990 | * use count for the regulator will be initialised to reflect the current | |
1991 | * state of the regulator. | |
5ffbd136 MB |
1992 | * |
1993 | * This is intended for use by consumers which cannot tolerate shared | |
1994 | * use of the regulator such as those which need to force the | |
1995 | * regulator off for correct operation of the hardware they are | |
1996 | * controlling. | |
1997 | * | |
1998 | * Use of supply names configured via regulator_set_device_supply() is | |
1999 | * strongly encouraged. It is recommended that the supply name used | |
2000 | * should match the name used for the supply and/or the relevant | |
2001 | * device pins in the datasheet. | |
2002 | */ | |
2003 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2004 | { | |
a8bd42a9 | 2005 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2006 | } |
2007 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2008 | ||
de1dd9fd MB |
2009 | /** |
2010 | * regulator_get_optional - obtain optional access to a regulator. | |
2011 | * @dev: device for regulator "consumer" | |
2012 | * @id: Supply name or regulator ID. | |
2013 | * | |
2014 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2015 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2016 | * |
2017 | * This is intended for use by consumers for devices which can have | |
2018 | * some supplies unconnected in normal use, such as some MMC devices. | |
2019 | * It can allow the regulator core to provide stub supplies for other | |
2020 | * supplies requested using normal regulator_get() calls without | |
2021 | * disrupting the operation of drivers that can handle absent | |
2022 | * supplies. | |
2023 | * | |
2024 | * Use of supply names configured via regulator_set_device_supply() is | |
2025 | * strongly encouraged. It is recommended that the supply name used | |
2026 | * should match the name used for the supply and/or the relevant | |
2027 | * device pins in the datasheet. | |
2028 | */ | |
2029 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2030 | { | |
a8bd42a9 | 2031 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2032 | } |
2033 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2034 | ||
83b0302d | 2035 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 2036 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
2037 | { |
2038 | struct regulator_dev *rdev; | |
2039 | ||
93576842 | 2040 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
2041 | return; |
2042 | ||
70cfef26 KK |
2043 | lockdep_assert_held_once(®ulator_list_mutex); |
2044 | ||
5451781d DA |
2045 | /* Docs say you must disable before calling regulator_put() */ |
2046 | WARN_ON(regulator->enable_count); | |
2047 | ||
414c70cb LG |
2048 | rdev = regulator->rdev; |
2049 | ||
5de70519 | 2050 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2051 | |
ed1ae2dd | 2052 | if (regulator->dev) { |
82874ba4 | 2053 | device_link_remove(regulator->dev, &rdev->dev); |
ed1ae2dd | 2054 | |
2055 | /* remove any sysfs entries */ | |
414c70cb | 2056 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2057 | } |
2058 | ||
66cf9a7e | 2059 | regulator_lock(rdev); |
414c70cb | 2060 | list_del(®ulator->list); |
414c70cb | 2061 | |
5ffbd136 MB |
2062 | rdev->open_count--; |
2063 | rdev->exclusive = 0; | |
85f3b431 | 2064 | put_device(&rdev->dev); |
66cf9a7e | 2065 | regulator_unlock(rdev); |
5ffbd136 | 2066 | |
0630b614 | 2067 | kfree_const(regulator->supply_name); |
1768514e MB |
2068 | kfree(regulator); |
2069 | ||
414c70cb | 2070 | module_put(rdev->owner); |
23ff2f0f CK |
2071 | } |
2072 | ||
2073 | /** | |
2074 | * regulator_put - "free" the regulator source | |
2075 | * @regulator: regulator source | |
2076 | * | |
2077 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2078 | * regulator source are balanced by regulator_disable calls prior to calling | |
2079 | * this function. | |
2080 | */ | |
2081 | void regulator_put(struct regulator *regulator) | |
2082 | { | |
2083 | mutex_lock(®ulator_list_mutex); | |
2084 | _regulator_put(regulator); | |
414c70cb LG |
2085 | mutex_unlock(®ulator_list_mutex); |
2086 | } | |
2087 | EXPORT_SYMBOL_GPL(regulator_put); | |
2088 | ||
a06ccd9c CK |
2089 | /** |
2090 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2091 | * | |
2092 | * @dev: device that will be given as the regulator "consumer" | |
2093 | * @id: Supply name or regulator ID | |
2094 | * @alias_dev: device that should be used to lookup the supply | |
2095 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2096 | * supply | |
2097 | * | |
2098 | * All lookups for id on dev will instead be conducted for alias_id on | |
2099 | * alias_dev. | |
2100 | */ | |
2101 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2102 | struct device *alias_dev, | |
2103 | const char *alias_id) | |
2104 | { | |
2105 | struct regulator_supply_alias *map; | |
2106 | ||
2107 | map = regulator_find_supply_alias(dev, id); | |
2108 | if (map) | |
2109 | return -EEXIST; | |
2110 | ||
2111 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2112 | if (!map) | |
2113 | return -ENOMEM; | |
2114 | ||
2115 | map->src_dev = dev; | |
2116 | map->src_supply = id; | |
2117 | map->alias_dev = alias_dev; | |
2118 | map->alias_supply = alias_id; | |
2119 | ||
2120 | list_add(&map->list, ®ulator_supply_alias_list); | |
2121 | ||
2122 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2123 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2124 | ||
2125 | return 0; | |
2126 | } | |
2127 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2128 | ||
2129 | /** | |
2130 | * regulator_unregister_supply_alias - Remove device alias | |
2131 | * | |
2132 | * @dev: device that will be given as the regulator "consumer" | |
2133 | * @id: Supply name or regulator ID | |
2134 | * | |
2135 | * Remove a lookup alias if one exists for id on dev. | |
2136 | */ | |
2137 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2138 | { | |
2139 | struct regulator_supply_alias *map; | |
2140 | ||
2141 | map = regulator_find_supply_alias(dev, id); | |
2142 | if (map) { | |
2143 | list_del(&map->list); | |
2144 | kfree(map); | |
2145 | } | |
2146 | } | |
2147 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2148 | ||
2149 | /** | |
2150 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2151 | * | |
2152 | * @dev: device that will be given as the regulator "consumer" | |
2153 | * @id: List of supply names or regulator IDs | |
2154 | * @alias_dev: device that should be used to lookup the supply | |
2155 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2156 | * lookup the supply | |
2157 | * @num_id: Number of aliases to register | |
2158 | * | |
2159 | * @return 0 on success, an errno on failure. | |
2160 | * | |
2161 | * This helper function allows drivers to register several supply | |
2162 | * aliases in one operation. If any of the aliases cannot be | |
2163 | * registered any aliases that were registered will be removed | |
2164 | * before returning to the caller. | |
2165 | */ | |
9f8c0fe9 LJ |
2166 | int regulator_bulk_register_supply_alias(struct device *dev, |
2167 | const char *const *id, | |
a06ccd9c | 2168 | struct device *alias_dev, |
9f8c0fe9 | 2169 | const char *const *alias_id, |
a06ccd9c CK |
2170 | int num_id) |
2171 | { | |
2172 | int i; | |
2173 | int ret; | |
2174 | ||
2175 | for (i = 0; i < num_id; ++i) { | |
2176 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2177 | alias_id[i]); | |
2178 | if (ret < 0) | |
2179 | goto err; | |
2180 | } | |
2181 | ||
2182 | return 0; | |
2183 | ||
2184 | err: | |
2185 | dev_err(dev, | |
2186 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2187 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2188 | ||
2189 | while (--i >= 0) | |
2190 | regulator_unregister_supply_alias(dev, id[i]); | |
2191 | ||
2192 | return ret; | |
2193 | } | |
2194 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2195 | ||
2196 | /** | |
2197 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2198 | * | |
2199 | * @dev: device that will be given as the regulator "consumer" | |
2200 | * @id: List of supply names or regulator IDs | |
2201 | * @num_id: Number of aliases to unregister | |
2202 | * | |
2203 | * This helper function allows drivers to unregister several supply | |
2204 | * aliases in one operation. | |
2205 | */ | |
2206 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2207 | const char *const *id, |
a06ccd9c CK |
2208 | int num_id) |
2209 | { | |
2210 | int i; | |
2211 | ||
2212 | for (i = 0; i < num_id; ++i) | |
2213 | regulator_unregister_supply_alias(dev, id[i]); | |
2214 | } | |
2215 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2216 | ||
2217 | ||
f19b00da KM |
2218 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2219 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2220 | const struct regulator_config *config) | |
2221 | { | |
2222 | struct regulator_enable_gpio *pin; | |
778b28b4 | 2223 | struct gpio_desc *gpiod; |
f19b00da | 2224 | |
541d052d | 2225 | gpiod = config->ena_gpiod; |
778b28b4 | 2226 | |
f19b00da | 2227 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2228 | if (pin->gpiod == gpiod) { |
541d052d | 2229 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2230 | goto update_ena_gpio_to_rdev; |
2231 | } | |
2232 | } | |
2233 | ||
f19b00da | 2234 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); |
541d052d | 2235 | if (pin == NULL) |
f19b00da | 2236 | return -ENOMEM; |
f19b00da | 2237 | |
778b28b4 | 2238 | pin->gpiod = gpiod; |
f19b00da KM |
2239 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2240 | ||
2241 | update_ena_gpio_to_rdev: | |
2242 | pin->request_count++; | |
2243 | rdev->ena_pin = pin; | |
2244 | return 0; | |
2245 | } | |
2246 | ||
2247 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2248 | { | |
2249 | struct regulator_enable_gpio *pin, *n; | |
2250 | ||
2251 | if (!rdev->ena_pin) | |
2252 | return; | |
2253 | ||
2254 | /* Free the GPIO only in case of no use */ | |
2255 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 2256 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
2257 | if (pin->request_count <= 1) { |
2258 | pin->request_count = 0; | |
f19b00da KM |
2259 | list_del(&pin->list); |
2260 | kfree(pin); | |
60a2362f SWK |
2261 | rdev->ena_pin = NULL; |
2262 | return; | |
f19b00da KM |
2263 | } else { |
2264 | pin->request_count--; | |
2265 | } | |
2266 | } | |
2267 | } | |
2268 | } | |
2269 | ||
967cfb18 | 2270 | /** |
31d6eebf RD |
2271 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2272 | * @rdev: regulator_dev structure | |
2273 | * @enable: enable GPIO at initial use? | |
2274 | * | |
967cfb18 KM |
2275 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2276 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2277 | */ | |
2278 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2279 | { | |
2280 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2281 | ||
2282 | if (!pin) | |
2283 | return -EINVAL; | |
2284 | ||
2285 | if (enable) { | |
2286 | /* Enable GPIO at initial use */ | |
2287 | if (pin->enable_count == 0) | |
01dc79cd | 2288 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2289 | |
2290 | pin->enable_count++; | |
2291 | } else { | |
2292 | if (pin->enable_count > 1) { | |
2293 | pin->enable_count--; | |
2294 | return 0; | |
2295 | } | |
2296 | ||
2297 | /* Disable GPIO if not used */ | |
2298 | if (pin->enable_count <= 1) { | |
01dc79cd | 2299 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2300 | pin->enable_count = 0; |
2301 | } | |
2302 | } | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
79fd1141 GX |
2307 | /** |
2308 | * _regulator_enable_delay - a delay helper function | |
2309 | * @delay: time to delay in microseconds | |
2310 | * | |
2311 | * Delay for the requested amount of time as per the guidelines in: | |
2312 | * | |
2313 | * Documentation/timers/timers-howto.txt | |
2314 | * | |
2315 | * The assumption here is that regulators will never be enabled in | |
2316 | * atomic context and therefore sleeping functions can be used. | |
2317 | */ | |
2318 | static void _regulator_enable_delay(unsigned int delay) | |
2319 | { | |
2320 | unsigned int ms = delay / 1000; | |
2321 | unsigned int us = delay % 1000; | |
2322 | ||
2323 | if (ms > 0) { | |
2324 | /* | |
2325 | * For small enough values, handle super-millisecond | |
2326 | * delays in the usleep_range() call below. | |
2327 | */ | |
2328 | if (ms < 20) | |
2329 | us += ms * 1000; | |
2330 | else | |
2331 | msleep(ms); | |
2332 | } | |
2333 | ||
2334 | /* | |
2335 | * Give the scheduler some room to coalesce with any other | |
2336 | * wakeup sources. For delays shorter than 10 us, don't even | |
2337 | * bother setting up high-resolution timers and just busy- | |
2338 | * loop. | |
2339 | */ | |
2340 | if (us >= 10) | |
2341 | usleep_range(us, us + 100); | |
2342 | else | |
2343 | udelay(us); | |
2344 | } | |
2345 | ||
5c5659d0 MB |
2346 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2347 | { | |
2348 | int ret, delay; | |
2349 | ||
2350 | /* Query before enabling in case configuration dependent. */ | |
2351 | ret = _regulator_get_enable_time(rdev); | |
2352 | if (ret >= 0) { | |
2353 | delay = ret; | |
2354 | } else { | |
2355 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2356 | delay = 0; | |
2357 | } | |
2358 | ||
2359 | trace_regulator_enable(rdev_get_name(rdev)); | |
2360 | ||
871f5650 GX |
2361 | if (rdev->desc->off_on_delay) { |
2362 | /* if needed, keep a distance of off_on_delay from last time | |
2363 | * this regulator was disabled. | |
2364 | */ | |
2365 | unsigned long start_jiffy = jiffies; | |
2366 | unsigned long intended, max_delay, remaining; | |
2367 | ||
2368 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2369 | intended = rdev->last_off_jiffy + max_delay; | |
2370 | ||
2371 | if (time_before(start_jiffy, intended)) { | |
2372 | /* calc remaining jiffies to deal with one-time | |
2373 | * timer wrapping. | |
2374 | * in case of multiple timer wrapping, either it can be | |
2375 | * detected by out-of-range remaining, or it cannot be | |
48f1b4ef | 2376 | * detected and we get a penalty of |
871f5650 GX |
2377 | * _regulator_enable_delay(). |
2378 | */ | |
2379 | remaining = intended - start_jiffy; | |
2380 | if (remaining <= max_delay) | |
2381 | _regulator_enable_delay( | |
2382 | jiffies_to_usecs(remaining)); | |
2383 | } | |
2384 | } | |
2385 | ||
967cfb18 | 2386 | if (rdev->ena_pin) { |
29d62ec5 DA |
2387 | if (!rdev->ena_gpio_state) { |
2388 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2389 | if (ret < 0) | |
2390 | return ret; | |
2391 | rdev->ena_gpio_state = 1; | |
2392 | } | |
65f73508 | 2393 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2394 | ret = rdev->desc->ops->enable(rdev); |
2395 | if (ret < 0) | |
2396 | return ret; | |
2397 | } else { | |
2398 | return -EINVAL; | |
2399 | } | |
2400 | ||
2401 | /* Allow the regulator to ramp; it would be useful to extend | |
2402 | * this for bulk operations so that the regulators can ramp | |
2403 | * together. */ | |
2404 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2405 | ||
79fd1141 | 2406 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2407 | |
2408 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2409 | ||
2410 | return 0; | |
2411 | } | |
2412 | ||
5451781d DA |
2413 | /** |
2414 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2415 | * @regulator: regulator source | |
2416 | * | |
2417 | * Some things on a regulator consumer (like the contribution towards total | |
2418 | * load on the regulator) only have an effect when the consumer wants the | |
2419 | * regulator enabled. Explained in example with two consumers of the same | |
2420 | * regulator: | |
2421 | * consumer A: set_load(100); => total load = 0 | |
2422 | * consumer A: regulator_enable(); => total load = 100 | |
2423 | * consumer B: set_load(1000); => total load = 100 | |
2424 | * consumer B: regulator_enable(); => total load = 1100 | |
2425 | * consumer A: regulator_disable(); => total_load = 1000 | |
2426 | * | |
2427 | * This function (together with _regulator_handle_consumer_disable) is | |
2428 | * responsible for keeping track of the refcount for a given regulator consumer | |
2429 | * and applying / unapplying these things. | |
2430 | * | |
2431 | * Returns 0 upon no error; -error upon error. | |
2432 | */ | |
2433 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2434 | { | |
2435 | struct regulator_dev *rdev = regulator->rdev; | |
2436 | ||
2437 | lockdep_assert_held_once(&rdev->mutex.base); | |
2438 | ||
2439 | regulator->enable_count++; | |
2440 | if (regulator->uA_load && regulator->enable_count == 1) | |
2441 | return drms_uA_update(rdev); | |
2442 | ||
2443 | return 0; | |
2444 | } | |
2445 | ||
2446 | /** | |
2447 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2448 | * @regulator: regulator source | |
2449 | * | |
2450 | * The opposite of _regulator_handle_consumer_enable(). | |
2451 | * | |
2452 | * Returns 0 upon no error; -error upon error. | |
2453 | */ | |
2454 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2455 | { | |
2456 | struct regulator_dev *rdev = regulator->rdev; | |
2457 | ||
2458 | lockdep_assert_held_once(&rdev->mutex.base); | |
2459 | ||
2460 | if (!regulator->enable_count) { | |
2461 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2462 | return -EINVAL; | |
2463 | } | |
2464 | ||
2465 | regulator->enable_count--; | |
2466 | if (regulator->uA_load && regulator->enable_count == 0) | |
2467 | return drms_uA_update(rdev); | |
2468 | ||
2469 | return 0; | |
2470 | } | |
2471 | ||
414c70cb | 2472 | /* locks held by regulator_enable() */ |
5451781d | 2473 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2474 | { |
5451781d | 2475 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2476 | int ret; |
414c70cb | 2477 | |
f8702f9e DO |
2478 | lockdep_assert_held_once(&rdev->mutex.base); |
2479 | ||
1fc12b05 | 2480 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2481 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2482 | if (ret < 0) |
2483 | return ret; | |
2484 | } | |
2485 | ||
2486 | /* balance only if there are regulators coupled */ | |
2487 | if (rdev->coupling_desc.n_coupled > 1) { | |
2488 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2489 | if (ret < 0) | |
2490 | goto err_disable_supply; | |
2491 | } | |
70cfef26 | 2492 | |
5451781d DA |
2493 | ret = _regulator_handle_consumer_enable(regulator); |
2494 | if (ret < 0) | |
2495 | goto err_disable_supply; | |
414c70cb | 2496 | |
9a2372fa MB |
2497 | if (rdev->use_count == 0) { |
2498 | /* The regulator may on if it's not switchable or left on */ | |
2499 | ret = _regulator_is_enabled(rdev); | |
2500 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2501 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2502 | REGULATOR_CHANGE_STATUS)) { |
2503 | ret = -EPERM; | |
5451781d | 2504 | goto err_consumer_disable; |
f8702f9e | 2505 | } |
9a2372fa | 2506 | |
5c5659d0 | 2507 | ret = _regulator_do_enable(rdev); |
31aae2be | 2508 | if (ret < 0) |
5451781d | 2509 | goto err_consumer_disable; |
31aae2be | 2510 | |
264b88c9 HG |
2511 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2512 | NULL); | |
a7433cff | 2513 | } else if (ret < 0) { |
5da84fd9 | 2514 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
5451781d | 2515 | goto err_consumer_disable; |
414c70cb | 2516 | } |
a7433cff | 2517 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2518 | } |
2519 | ||
9a2372fa MB |
2520 | rdev->use_count++; |
2521 | ||
2522 | return 0; | |
f8702f9e | 2523 | |
5451781d DA |
2524 | err_consumer_disable: |
2525 | _regulator_handle_consumer_disable(regulator); | |
2526 | ||
f8702f9e | 2527 | err_disable_supply: |
1fc12b05 | 2528 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2529 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2530 | |
2531 | return ret; | |
414c70cb LG |
2532 | } |
2533 | ||
2534 | /** | |
2535 | * regulator_enable - enable regulator output | |
2536 | * @regulator: regulator source | |
2537 | * | |
cf7bbcdf MB |
2538 | * Request that the regulator be enabled with the regulator output at |
2539 | * the predefined voltage or current value. Calls to regulator_enable() | |
2540 | * must be balanced with calls to regulator_disable(). | |
2541 | * | |
414c70cb | 2542 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2543 | * hardwired in the regulator. |
414c70cb LG |
2544 | */ |
2545 | int regulator_enable(struct regulator *regulator) | |
2546 | { | |
412aec61 | 2547 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2548 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2549 | int ret; |
6492bc1b | 2550 | |
f8702f9e | 2551 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2552 | ret = _regulator_enable(regulator); |
f8702f9e | 2553 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2554 | |
414c70cb LG |
2555 | return ret; |
2556 | } | |
2557 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2558 | ||
5c5659d0 MB |
2559 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2560 | { | |
2561 | int ret; | |
2562 | ||
2563 | trace_regulator_disable(rdev_get_name(rdev)); | |
2564 | ||
967cfb18 | 2565 | if (rdev->ena_pin) { |
29d62ec5 DA |
2566 | if (rdev->ena_gpio_state) { |
2567 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2568 | if (ret < 0) | |
2569 | return ret; | |
2570 | rdev->ena_gpio_state = 0; | |
2571 | } | |
5c5659d0 MB |
2572 | |
2573 | } else if (rdev->desc->ops->disable) { | |
2574 | ret = rdev->desc->ops->disable(rdev); | |
2575 | if (ret != 0) | |
2576 | return ret; | |
2577 | } | |
2578 | ||
871f5650 GX |
2579 | /* cares about last_off_jiffy only if off_on_delay is required by |
2580 | * device. | |
2581 | */ | |
2582 | if (rdev->desc->off_on_delay) | |
2583 | rdev->last_off_jiffy = jiffies; | |
2584 | ||
5c5659d0 MB |
2585 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2586 | ||
5c5659d0 MB |
2587 | return 0; |
2588 | } | |
2589 | ||
414c70cb | 2590 | /* locks held by regulator_disable() */ |
5451781d | 2591 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2592 | { |
5451781d | 2593 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2594 | int ret = 0; |
2595 | ||
f8702f9e | 2596 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2597 | |
cd94b505 | 2598 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2599 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2600 | return -EIO; |
2601 | ||
414c70cb | 2602 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2603 | if (rdev->use_count == 1 && |
2604 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2605 | |
2606 | /* we are last user */ | |
8a34e979 | 2607 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2608 | ret = _notifier_call_chain(rdev, |
2609 | REGULATOR_EVENT_PRE_DISABLE, | |
2610 | NULL); | |
2611 | if (ret & NOTIFY_STOP_MASK) | |
2612 | return -EINVAL; | |
2613 | ||
5c5659d0 | 2614 | ret = _regulator_do_disable(rdev); |
414c70cb | 2615 | if (ret < 0) { |
5da84fd9 | 2616 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2617 | _notifier_call_chain(rdev, |
2618 | REGULATOR_EVENT_ABORT_DISABLE, | |
2619 | NULL); | |
414c70cb LG |
2620 | return ret; |
2621 | } | |
66fda75f MP |
2622 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2623 | NULL); | |
414c70cb LG |
2624 | } |
2625 | ||
414c70cb LG |
2626 | rdev->use_count = 0; |
2627 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2628 | rdev->use_count--; |
2629 | } | |
3801b86a | 2630 | |
5451781d DA |
2631 | if (ret == 0) |
2632 | ret = _regulator_handle_consumer_disable(regulator); | |
2633 | ||
f8702f9e DO |
2634 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2635 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2636 | ||
1fc12b05 | 2637 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2638 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2639 | |
414c70cb LG |
2640 | return ret; |
2641 | } | |
2642 | ||
2643 | /** | |
2644 | * regulator_disable - disable regulator output | |
2645 | * @regulator: regulator source | |
2646 | * | |
cf7bbcdf MB |
2647 | * Disable the regulator output voltage or current. Calls to |
2648 | * regulator_enable() must be balanced with calls to | |
2649 | * regulator_disable(). | |
69279fb9 | 2650 | * |
414c70cb | 2651 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2652 | * devices have it enabled, the regulator device supports disabling and |
2653 | * machine constraints permit this operation. | |
414c70cb LG |
2654 | */ |
2655 | int regulator_disable(struct regulator *regulator) | |
2656 | { | |
412aec61 | 2657 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2658 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2659 | int ret; |
6492bc1b | 2660 | |
f8702f9e | 2661 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2662 | ret = _regulator_disable(regulator); |
f8702f9e | 2663 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2664 | |
414c70cb LG |
2665 | return ret; |
2666 | } | |
2667 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2668 | ||
2669 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2670 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2671 | { |
2672 | int ret = 0; | |
2673 | ||
f8702f9e | 2674 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2675 | |
a1c8a551 RF |
2676 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2677 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2678 | if (ret & NOTIFY_STOP_MASK) | |
2679 | return -EINVAL; | |
2680 | ||
66fda75f MP |
2681 | ret = _regulator_do_disable(rdev); |
2682 | if (ret < 0) { | |
2683 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2684 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2685 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2686 | return ret; |
414c70cb LG |
2687 | } |
2688 | ||
66fda75f MP |
2689 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2690 | REGULATOR_EVENT_DISABLE, NULL); | |
2691 | ||
2692 | return 0; | |
414c70cb LG |
2693 | } |
2694 | ||
2695 | /** | |
2696 | * regulator_force_disable - force disable regulator output | |
2697 | * @regulator: regulator source | |
2698 | * | |
2699 | * Forcibly disable the regulator output voltage or current. | |
2700 | * NOTE: this *will* disable the regulator output even if other consumer | |
2701 | * devices have it enabled. This should be used for situations when device | |
2702 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2703 | */ | |
2704 | int regulator_force_disable(struct regulator *regulator) | |
2705 | { | |
82d15839 | 2706 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2707 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2708 | int ret; |
2709 | ||
f8702f9e | 2710 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2711 | |
3801b86a | 2712 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2713 | |
9243a195 MP |
2714 | if (rdev->coupling_desc.n_coupled > 1) |
2715 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2716 | |
2717 | if (regulator->uA_load) { | |
2718 | regulator->uA_load = 0; | |
2719 | ret = drms_uA_update(rdev); | |
2720 | } | |
2721 | ||
1fc12b05 DA |
2722 | if (rdev->use_count != 0 && rdev->supply) |
2723 | _regulator_disable(rdev->supply); | |
8cbf811d | 2724 | |
1fc12b05 | 2725 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2726 | |
414c70cb LG |
2727 | return ret; |
2728 | } | |
2729 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2730 | ||
da07ecd9 MB |
2731 | static void regulator_disable_work(struct work_struct *work) |
2732 | { | |
2733 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2734 | disable_work.work); | |
f8702f9e | 2735 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2736 | int count, i, ret; |
5451781d DA |
2737 | struct regulator *regulator; |
2738 | int total_count = 0; | |
da07ecd9 | 2739 | |
f8702f9e | 2740 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2741 | |
c9ccaa0c TR |
2742 | /* |
2743 | * Workqueue functions queue the new work instance while the previous | |
2744 | * work instance is being processed. Cancel the queued work instance | |
2745 | * as the work instance under processing does the job of the queued | |
2746 | * work instance. | |
2747 | */ | |
2748 | cancel_delayed_work(&rdev->disable_work); | |
2749 | ||
5451781d DA |
2750 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2751 | count = regulator->deferred_disables; | |
2752 | ||
2753 | if (!count) | |
2754 | continue; | |
2755 | ||
2756 | total_count += count; | |
2757 | regulator->deferred_disables = 0; | |
2758 | ||
2759 | for (i = 0; i < count; i++) { | |
2760 | ret = _regulator_disable(regulator); | |
2761 | if (ret != 0) | |
2762 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2763 | } | |
da07ecd9 | 2764 | } |
5451781d | 2765 | WARN_ON(!total_count); |
da07ecd9 | 2766 | |
f8702f9e DO |
2767 | if (rdev->coupling_desc.n_coupled > 1) |
2768 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2769 | ||
2770 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2771 | } |
2772 | ||
2773 | /** | |
2774 | * regulator_disable_deferred - disable regulator output with delay | |
2775 | * @regulator: regulator source | |
48f1b4ef | 2776 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
2777 | * |
2778 | * Execute regulator_disable() on the regulator after a delay. This | |
2779 | * is intended for use with devices that require some time to quiesce. | |
2780 | * | |
2781 | * NOTE: this will only disable the regulator output if no other consumer | |
2782 | * devices have it enabled, the regulator device supports disabling and | |
2783 | * machine constraints permit this operation. | |
2784 | */ | |
2785 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2786 | { | |
2787 | struct regulator_dev *rdev = regulator->rdev; | |
2788 | ||
2b5a24a0 MB |
2789 | if (!ms) |
2790 | return regulator_disable(regulator); | |
2791 | ||
66cf9a7e | 2792 | regulator_lock(rdev); |
5451781d | 2793 | regulator->deferred_disables++; |
c9ccaa0c TR |
2794 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2795 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2796 | regulator_unlock(rdev); |
da07ecd9 | 2797 | |
70dc6daf | 2798 | return 0; |
da07ecd9 MB |
2799 | } |
2800 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2801 | ||
414c70cb LG |
2802 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2803 | { | |
65f73508 | 2804 | /* A GPIO control always takes precedence */ |
7b74d149 | 2805 | if (rdev->ena_pin) |
65f73508 MB |
2806 | return rdev->ena_gpio_state; |
2807 | ||
9a7f6a4c | 2808 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2809 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2810 | return 1; |
414c70cb | 2811 | |
9332546f | 2812 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2813 | } |
2814 | ||
3d67fe95 MP |
2815 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2816 | unsigned selector, int lock) | |
3a40cfc3 | 2817 | { |
3a40cfc3 SH |
2818 | const struct regulator_ops *ops = rdev->desc->ops; |
2819 | int ret; | |
2820 | ||
2821 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2822 | return rdev->desc->fixed_uV; | |
2823 | ||
2824 | if (ops->list_voltage) { | |
2825 | if (selector >= rdev->desc->n_voltages) | |
2826 | return -EINVAL; | |
2827 | if (lock) | |
66cf9a7e | 2828 | regulator_lock(rdev); |
3a40cfc3 SH |
2829 | ret = ops->list_voltage(rdev, selector); |
2830 | if (lock) | |
66cf9a7e | 2831 | regulator_unlock(rdev); |
fd086045 | 2832 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2833 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2834 | selector, lock); | |
3a40cfc3 SH |
2835 | } else { |
2836 | return -EINVAL; | |
2837 | } | |
2838 | ||
2839 | if (ret > 0) { | |
2840 | if (ret < rdev->constraints->min_uV) | |
2841 | ret = 0; | |
2842 | else if (ret > rdev->constraints->max_uV) | |
2843 | ret = 0; | |
2844 | } | |
2845 | ||
2846 | return ret; | |
2847 | } | |
2848 | ||
414c70cb LG |
2849 | /** |
2850 | * regulator_is_enabled - is the regulator output enabled | |
2851 | * @regulator: regulator source | |
2852 | * | |
412aec61 DB |
2853 | * Returns positive if the regulator driver backing the source/client |
2854 | * has requested that the device be enabled, zero if it hasn't, else a | |
2855 | * negative errno code. | |
2856 | * | |
2857 | * Note that the device backing this regulator handle can have multiple | |
2858 | * users, so it might be enabled even if regulator_enable() was never | |
2859 | * called for this particular source. | |
414c70cb LG |
2860 | */ |
2861 | int regulator_is_enabled(struct regulator *regulator) | |
2862 | { | |
9332546f MB |
2863 | int ret; |
2864 | ||
6492bc1b MB |
2865 | if (regulator->always_on) |
2866 | return 1; | |
2867 | ||
f8702f9e | 2868 | regulator_lock(regulator->rdev); |
9332546f | 2869 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 2870 | regulator_unlock(regulator->rdev); |
9332546f MB |
2871 | |
2872 | return ret; | |
414c70cb LG |
2873 | } |
2874 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2875 | ||
4367cfdc DB |
2876 | /** |
2877 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2878 | * @regulator: regulator source | |
2879 | * | |
2880 | * Returns number of selectors, or negative errno. Selectors are | |
2881 | * numbered starting at zero, and typically correspond to bitfields | |
2882 | * in hardware registers. | |
2883 | */ | |
2884 | int regulator_count_voltages(struct regulator *regulator) | |
2885 | { | |
2886 | struct regulator_dev *rdev = regulator->rdev; | |
2887 | ||
26988efe JMC |
2888 | if (rdev->desc->n_voltages) |
2889 | return rdev->desc->n_voltages; | |
2890 | ||
fd086045 | 2891 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
2892 | return -EINVAL; |
2893 | ||
2894 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2895 | } |
2896 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2897 | ||
2898 | /** | |
2899 | * regulator_list_voltage - enumerate supported voltages | |
2900 | * @regulator: regulator source | |
2901 | * @selector: identify voltage to list | |
2902 | * Context: can sleep | |
2903 | * | |
2904 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2905 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2906 | * negative errno. |
2907 | */ | |
2908 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2909 | { | |
3d67fe95 | 2910 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
2911 | } |
2912 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2913 | ||
04eca28c TT |
2914 | /** |
2915 | * regulator_get_regmap - get the regulator's register map | |
2916 | * @regulator: regulator source | |
2917 | * | |
2918 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2919 | * if the regulator doesn't use regmap. | |
2920 | */ | |
2921 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2922 | { | |
2923 | struct regmap *map = regulator->rdev->regmap; | |
2924 | ||
2925 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2926 | } | |
2927 | ||
2928 | /** | |
2929 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2930 | * @regulator: regulator source | |
2931 | * @vsel_reg: voltage selector register, output parameter | |
2932 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2933 | * | |
2934 | * Returns the hardware register offset and bitmask used for setting the | |
2935 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2936 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2937 | * for example. | |
2938 | * | |
2939 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2940 | * and 0 is returned, otherwise a negative errno is returned. | |
2941 | */ | |
2942 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2943 | unsigned *vsel_reg, | |
2944 | unsigned *vsel_mask) | |
2945 | { | |
39f5460d GX |
2946 | struct regulator_dev *rdev = regulator->rdev; |
2947 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2948 | |
2949 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2950 | return -EOPNOTSUPP; | |
2951 | ||
0d5c8633 CIK |
2952 | *vsel_reg = rdev->desc->vsel_reg; |
2953 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c TT |
2954 | |
2955 | return 0; | |
2956 | } | |
2957 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2958 | ||
2959 | /** | |
2960 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2961 | * @regulator: regulator source | |
2962 | * @selector: identify voltage to list | |
2963 | * | |
2964 | * Converts the selector to a hardware-specific voltage selector that can be | |
2965 | * directly written to the regulator registers. The address of the voltage | |
2966 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2967 | * | |
2968 | * On error a negative errno is returned. | |
2969 | */ | |
2970 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2971 | unsigned selector) | |
2972 | { | |
39f5460d GX |
2973 | struct regulator_dev *rdev = regulator->rdev; |
2974 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2975 | |
2976 | if (selector >= rdev->desc->n_voltages) | |
2977 | return -EINVAL; | |
2978 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2979 | return -EOPNOTSUPP; | |
2980 | ||
2981 | return selector; | |
2982 | } | |
2983 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2984 | ||
2a668a8b PW |
2985 | /** |
2986 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2987 | * @regulator: regulator source | |
2988 | * | |
2989 | * Returns the voltage step size between VSEL values for linear | |
2990 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2991 | */ | |
2992 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2993 | { | |
2994 | struct regulator_dev *rdev = regulator->rdev; | |
2995 | ||
2996 | return rdev->desc->uV_step; | |
2997 | } | |
2998 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2999 | ||
a7a1ad90 MB |
3000 | /** |
3001 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3002 | * | |
3003 | * @regulator: Regulator to check. | |
3004 | * @min_uV: Minimum required voltage in uV. | |
3005 | * @max_uV: Maximum required voltage in uV. | |
3006 | * | |
3007 | * Returns a boolean or a negative error code. | |
3008 | */ | |
3009 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3010 | int min_uV, int max_uV) | |
3011 | { | |
c5f3939b | 3012 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3013 | int i, voltages, ret; |
3014 | ||
c5f3939b | 3015 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3016 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3017 | ret = regulator_get_voltage(regulator); |
3018 | if (ret >= 0) | |
0d25d09d | 3019 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3020 | else |
3021 | return ret; | |
3022 | } | |
3023 | ||
bd7a2b60 PM |
3024 | /* Any voltage within constrains range is fine? */ |
3025 | if (rdev->desc->continuous_voltage_range) | |
3026 | return min_uV >= rdev->constraints->min_uV && | |
3027 | max_uV <= rdev->constraints->max_uV; | |
3028 | ||
a7a1ad90 MB |
3029 | ret = regulator_count_voltages(regulator); |
3030 | if (ret < 0) | |
3031 | return ret; | |
3032 | voltages = ret; | |
3033 | ||
3034 | for (i = 0; i < voltages; i++) { | |
3035 | ret = regulator_list_voltage(regulator, i); | |
3036 | ||
3037 | if (ret >= min_uV && ret <= max_uV) | |
3038 | return 1; | |
3039 | } | |
3040 | ||
3041 | return 0; | |
3042 | } | |
a398eaa2 | 3043 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3044 | |
a204f41e SH |
3045 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3046 | int max_uV) | |
3047 | { | |
3048 | const struct regulator_desc *desc = rdev->desc; | |
3049 | ||
3050 | if (desc->ops->map_voltage) | |
3051 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3052 | ||
3053 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3054 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3055 | ||
3056 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3057 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3058 | ||
18e4b55f MV |
3059 | if (desc->ops->list_voltage == |
3060 | regulator_list_voltage_pickable_linear_range) | |
3061 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3062 | min_uV, max_uV); | |
3063 | ||
a204f41e SH |
3064 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3065 | } | |
3066 | ||
7179569a HS |
3067 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3068 | int min_uV, int max_uV, | |
3069 | unsigned *selector) | |
3070 | { | |
3071 | struct pre_voltage_change_data data; | |
3072 | int ret; | |
3073 | ||
3074 | data.old_uV = _regulator_get_voltage(rdev); | |
3075 | data.min_uV = min_uV; | |
3076 | data.max_uV = max_uV; | |
3077 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3078 | &data); | |
3079 | if (ret & NOTIFY_STOP_MASK) | |
3080 | return -EINVAL; | |
3081 | ||
3082 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3083 | if (ret >= 0) | |
3084 | return ret; | |
3085 | ||
3086 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3087 | (void *)data.old_uV); | |
3088 | ||
3089 | return ret; | |
3090 | } | |
3091 | ||
3092 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3093 | int uV, unsigned selector) | |
3094 | { | |
3095 | struct pre_voltage_change_data data; | |
3096 | int ret; | |
3097 | ||
3098 | data.old_uV = _regulator_get_voltage(rdev); | |
3099 | data.min_uV = uV; | |
3100 | data.max_uV = uV; | |
3101 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3102 | &data); | |
3103 | if (ret & NOTIFY_STOP_MASK) | |
3104 | return -EINVAL; | |
3105 | ||
3106 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3107 | if (ret >= 0) | |
3108 | return ret; | |
3109 | ||
3110 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3111 | (void *)data.old_uV); | |
3112 | ||
3113 | return ret; | |
3114 | } | |
3115 | ||
73e705bf MK |
3116 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3117 | int old_uV, int new_uV) | |
3118 | { | |
3119 | unsigned int ramp_delay = 0; | |
3120 | ||
3121 | if (rdev->constraints->ramp_delay) | |
3122 | ramp_delay = rdev->constraints->ramp_delay; | |
3123 | else if (rdev->desc->ramp_delay) | |
3124 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3125 | else if (rdev->constraints->settling_time) |
3126 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3127 | else if (rdev->constraints->settling_time_up && |
3128 | (new_uV > old_uV)) | |
3129 | return rdev->constraints->settling_time_up; | |
3130 | else if (rdev->constraints->settling_time_down && | |
3131 | (new_uV < old_uV)) | |
3132 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3133 | |
3134 | if (ramp_delay == 0) { | |
ba14fa1a | 3135 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3136 | return 0; |
3137 | } | |
3138 | ||
3139 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3140 | } | |
3141 | ||
75790251 MB |
3142 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3143 | int min_uV, int max_uV) | |
3144 | { | |
3145 | int ret; | |
77af1b26 | 3146 | int delay = 0; |
e113d792 | 3147 | int best_val = 0; |
75790251 | 3148 | unsigned int selector; |
eba41a5e | 3149 | int old_selector = -1; |
57995a48 | 3150 | const struct regulator_ops *ops = rdev->desc->ops; |
73e705bf | 3151 | int old_uV = _regulator_get_voltage(rdev); |
75790251 MB |
3152 | |
3153 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3154 | ||
bf5892a8 MB |
3155 | min_uV += rdev->constraints->uV_offset; |
3156 | max_uV += rdev->constraints->uV_offset; | |
3157 | ||
eba41a5e AL |
3158 | /* |
3159 | * If we can't obtain the old selector there is not enough | |
3160 | * info to call set_voltage_time_sel(). | |
3161 | */ | |
8b7485ef | 3162 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3163 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3164 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3165 | if (old_selector < 0) |
3166 | return old_selector; | |
3167 | } | |
3168 | ||
57995a48 | 3169 | if (ops->set_voltage) { |
7179569a HS |
3170 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3171 | &selector); | |
e113d792 MB |
3172 | |
3173 | if (ret >= 0) { | |
57995a48 MK |
3174 | if (ops->list_voltage) |
3175 | best_val = ops->list_voltage(rdev, | |
3176 | selector); | |
e113d792 MB |
3177 | else |
3178 | best_val = _regulator_get_voltage(rdev); | |
3179 | } | |
3180 | ||
57995a48 | 3181 | } else if (ops->set_voltage_sel) { |
a204f41e | 3182 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3183 | if (ret >= 0) { |
57995a48 | 3184 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3185 | if (min_uV <= best_val && max_uV >= best_val) { |
3186 | selector = ret; | |
c66a566a AL |
3187 | if (old_selector == selector) |
3188 | ret = 0; | |
3189 | else | |
7179569a HS |
3190 | ret = _regulator_call_set_voltage_sel( |
3191 | rdev, best_val, selector); | |
e113d792 MB |
3192 | } else { |
3193 | ret = -EINVAL; | |
3194 | } | |
e8eef82b | 3195 | } |
75790251 MB |
3196 | } else { |
3197 | ret = -EINVAL; | |
3198 | } | |
e8eef82b | 3199 | |
31dfe686 MK |
3200 | if (ret) |
3201 | goto out; | |
77af1b26 | 3202 | |
73e705bf MK |
3203 | if (ops->set_voltage_time_sel) { |
3204 | /* | |
3205 | * Call set_voltage_time_sel if successfully obtained | |
3206 | * old_selector | |
3207 | */ | |
3208 | if (old_selector >= 0 && old_selector != selector) | |
3209 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3210 | selector); | |
3211 | } else { | |
3212 | if (old_uV != best_val) { | |
3213 | if (ops->set_voltage_time) | |
3214 | delay = ops->set_voltage_time(rdev, old_uV, | |
3215 | best_val); | |
3216 | else | |
3217 | delay = _regulator_set_voltage_time(rdev, | |
3218 | old_uV, | |
3219 | best_val); | |
e8eef82b | 3220 | } |
73e705bf | 3221 | } |
75790251 | 3222 | |
73e705bf MK |
3223 | if (delay < 0) { |
3224 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
3225 | delay = 0; | |
77af1b26 LW |
3226 | } |
3227 | ||
73e705bf MK |
3228 | /* Insert any necessary delays */ |
3229 | if (delay >= 1000) { | |
3230 | mdelay(delay / 1000); | |
3231 | udelay(delay % 1000); | |
3232 | } else if (delay) { | |
3233 | udelay(delay); | |
77af1b26 LW |
3234 | } |
3235 | ||
31dfe686 | 3236 | if (best_val >= 0) { |
2f6c797f AL |
3237 | unsigned long data = best_val; |
3238 | ||
ded06a52 | 3239 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3240 | (void *)data); |
3241 | } | |
ded06a52 | 3242 | |
31dfe686 | 3243 | out: |
eba41a5e | 3244 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3245 | |
3246 | return ret; | |
3247 | } | |
3248 | ||
f7efad10 CZ |
3249 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3250 | int min_uV, int max_uV, suspend_state_t state) | |
3251 | { | |
3252 | struct regulator_state *rstate; | |
3253 | int uV, sel; | |
3254 | ||
3255 | rstate = regulator_get_suspend_state(rdev, state); | |
3256 | if (rstate == NULL) | |
3257 | return -EINVAL; | |
3258 | ||
3259 | if (min_uV < rstate->min_uV) | |
3260 | min_uV = rstate->min_uV; | |
3261 | if (max_uV > rstate->max_uV) | |
3262 | max_uV = rstate->max_uV; | |
3263 | ||
3264 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3265 | if (sel < 0) | |
3266 | return sel; | |
3267 | ||
3268 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3269 | if (uV >= min_uV && uV <= max_uV) | |
3270 | rstate->uV = uV; | |
3271 | ||
3272 | return 0; | |
3273 | } | |
3274 | ||
a9f226bc | 3275 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3276 | int min_uV, int max_uV, |
3277 | suspend_state_t state) | |
414c70cb LG |
3278 | { |
3279 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3280 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3281 | int ret = 0; |
92d7a558 | 3282 | int old_min_uV, old_max_uV; |
c00dc359 | 3283 | int current_uV; |
414c70cb | 3284 | |
95a3c23a MB |
3285 | /* If we're setting the same range as last time the change |
3286 | * should be a noop (some cpufreq implementations use the same | |
3287 | * voltage for multiple frequencies, for example). | |
3288 | */ | |
c360a6df | 3289 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3290 | goto out; |
3291 | ||
c00dc359 | 3292 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3293 | * return successfully even though the regulator does not support |
c00dc359 BA |
3294 | * changing the voltage. |
3295 | */ | |
8a34e979 | 3296 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c00dc359 BA |
3297 | current_uV = _regulator_get_voltage(rdev); |
3298 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
c360a6df CZ |
3299 | voltage->min_uV = min_uV; |
3300 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3301 | goto out; |
3302 | } | |
3303 | } | |
3304 | ||
414c70cb | 3305 | /* sanity check */ |
e8eef82b MB |
3306 | if (!rdev->desc->ops->set_voltage && |
3307 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3308 | ret = -EINVAL; |
3309 | goto out; | |
3310 | } | |
3311 | ||
3312 | /* constraints check */ | |
3313 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3314 | if (ret < 0) | |
3315 | goto out; | |
0d25d09d | 3316 | |
92d7a558 | 3317 | /* restore original values in case of error */ |
c360a6df CZ |
3318 | old_min_uV = voltage->min_uV; |
3319 | old_max_uV = voltage->max_uV; | |
3320 | voltage->min_uV = min_uV; | |
3321 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3322 | |
9243a195 MP |
3323 | /* for not coupled regulators this will just set the voltage */ |
3324 | ret = regulator_balance_voltage(rdev, state); | |
05fda3b1 | 3325 | if (ret < 0) |
92d7a558 | 3326 | goto out2; |
05fda3b1 | 3327 | |
9243a195 MP |
3328 | out: |
3329 | return 0; | |
3330 | out2: | |
3331 | voltage->min_uV = old_min_uV; | |
3332 | voltage->max_uV = old_max_uV; | |
3333 | ||
3334 | return ret; | |
3335 | } | |
3336 | ||
3337 | static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, | |
3338 | int max_uV, suspend_state_t state) | |
3339 | { | |
3340 | int best_supply_uV = 0; | |
3341 | int supply_change_uV = 0; | |
3342 | int ret; | |
3343 | ||
43fc99f2 MB |
3344 | if (rdev->supply && |
3345 | regulator_ops_is_valid(rdev->supply->rdev, | |
3346 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3347 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3348 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3349 | int current_supply_uV; |
3350 | int selector; | |
3351 | ||
3352 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3353 | if (selector < 0) { | |
3354 | ret = selector; | |
9243a195 | 3355 | goto out; |
fc42112c SH |
3356 | } |
3357 | ||
00cb9f4f | 3358 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3359 | if (best_supply_uV < 0) { |
3360 | ret = best_supply_uV; | |
9243a195 | 3361 | goto out; |
fc42112c SH |
3362 | } |
3363 | ||
3364 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3365 | ||
3366 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
3367 | if (current_supply_uV < 0) { | |
3368 | ret = current_supply_uV; | |
9243a195 | 3369 | goto out; |
fc42112c SH |
3370 | } |
3371 | ||
3372 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3373 | } | |
3374 | ||
3375 | if (supply_change_uV > 0) { | |
3376 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3377 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3378 | if (ret) { |
3379 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3380 | ret); | |
9243a195 | 3381 | goto out; |
fc42112c SH |
3382 | } |
3383 | } | |
3384 | ||
f7efad10 CZ |
3385 | if (state == PM_SUSPEND_ON) |
3386 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3387 | else | |
3388 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3389 | max_uV, state); | |
92d7a558 | 3390 | if (ret < 0) |
9243a195 | 3391 | goto out; |
0d25d09d | 3392 | |
fc42112c SH |
3393 | if (supply_change_uV < 0) { |
3394 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3395 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3396 | if (ret) |
3397 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3398 | ret); | |
3399 | /* No need to fail here */ | |
3400 | ret = 0; | |
3401 | } | |
3402 | ||
414c70cb | 3403 | out: |
a9f226bc | 3404 | return ret; |
69686176 MP |
3405 | } |
3406 | ||
85254bcf DO |
3407 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3408 | int *current_uV, int *min_uV) | |
3409 | { | |
3410 | struct regulation_constraints *constraints = rdev->constraints; | |
3411 | ||
3412 | /* Limit voltage change only if necessary */ | |
3413 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3414 | return 1; | |
3415 | ||
3416 | if (*current_uV < 0) { | |
3417 | *current_uV = _regulator_get_voltage(rdev); | |
3418 | ||
3419 | if (*current_uV < 0) | |
3420 | return *current_uV; | |
3421 | } | |
3422 | ||
3423 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3424 | return 1; | |
3425 | ||
3426 | /* Clamp target voltage within the given step */ | |
3427 | if (*current_uV < *min_uV) | |
3428 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3429 | *min_uV); | |
3430 | else | |
3431 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3432 | *min_uV); | |
3433 | ||
3434 | return 0; | |
3435 | } | |
3436 | ||
c054c6c7 MP |
3437 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3438 | int *current_uV, | |
3439 | int *min_uV, int *max_uV, | |
3440 | suspend_state_t state, | |
3441 | int n_coupled) | |
3442 | { | |
3443 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3444 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3445 | struct regulation_constraints *constraints = rdev->constraints; | |
3446 | int max_spread = constraints->max_spread; | |
3447 | int desired_min_uV = 0, desired_max_uV = INT_MAX; | |
3448 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3449 | int highest_min_uV = 0, target_uV, possible_uV; | |
3450 | int i, ret; | |
3451 | bool done; | |
3452 | ||
3453 | *current_uV = -1; | |
3454 | ||
3455 | /* | |
3456 | * If there are no coupled regulators, simply set the voltage | |
3457 | * demanded by consumers. | |
3458 | */ | |
3459 | if (n_coupled == 1) { | |
3460 | /* | |
3461 | * If consumers don't provide any demands, set voltage | |
3462 | * to min_uV | |
3463 | */ | |
3464 | desired_min_uV = constraints->min_uV; | |
3465 | desired_max_uV = constraints->max_uV; | |
3466 | ||
3467 | ret = regulator_check_consumers(rdev, | |
3468 | &desired_min_uV, | |
3469 | &desired_max_uV, state); | |
3470 | if (ret < 0) | |
3471 | return ret; | |
3472 | ||
3473 | possible_uV = desired_min_uV; | |
3474 | done = true; | |
3475 | ||
3476 | goto finish; | |
3477 | } | |
3478 | ||
3479 | /* Find highest min desired voltage */ | |
3480 | for (i = 0; i < n_coupled; i++) { | |
3481 | int tmp_min = 0; | |
3482 | int tmp_max = INT_MAX; | |
3483 | ||
f8702f9e | 3484 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3485 | |
3486 | ret = regulator_check_consumers(c_rdevs[i], | |
3487 | &tmp_min, | |
3488 | &tmp_max, state); | |
3489 | if (ret < 0) | |
3490 | return ret; | |
3491 | ||
3492 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3493 | if (ret < 0) | |
3494 | return ret; | |
69686176 | 3495 | |
c054c6c7 MP |
3496 | highest_min_uV = max(highest_min_uV, tmp_min); |
3497 | ||
3498 | if (i == 0) { | |
3499 | desired_min_uV = tmp_min; | |
3500 | desired_max_uV = tmp_max; | |
3501 | } | |
3502 | } | |
3503 | ||
3504 | /* | |
3505 | * Let target_uV be equal to the desired one if possible. | |
3506 | * If not, set it to minimum voltage, allowed by other coupled | |
3507 | * regulators. | |
3508 | */ | |
3509 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3510 | ||
3511 | /* | |
3512 | * Find min and max voltages, which currently aren't violating | |
3513 | * max_spread. | |
3514 | */ | |
3515 | for (i = 1; i < n_coupled; i++) { | |
3516 | int tmp_act; | |
3517 | ||
3518 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3519 | continue; | |
3520 | ||
3521 | tmp_act = _regulator_get_voltage(c_rdevs[i]); | |
3522 | if (tmp_act < 0) | |
3523 | return tmp_act; | |
3524 | ||
3525 | min_current_uV = min(tmp_act, min_current_uV); | |
3526 | max_current_uV = max(tmp_act, max_current_uV); | |
3527 | } | |
3528 | ||
3529 | /* There aren't any other regulators enabled */ | |
3530 | if (max_current_uV == 0) { | |
3531 | possible_uV = target_uV; | |
3532 | } else { | |
3533 | /* | |
3534 | * Correct target voltage, so as it currently isn't | |
3535 | * violating max_spread | |
3536 | */ | |
3537 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3538 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3539 | } | |
3540 | ||
3541 | if (possible_uV > desired_max_uV) | |
3542 | return -EINVAL; | |
3543 | ||
3544 | done = (possible_uV == target_uV); | |
3545 | desired_min_uV = possible_uV; | |
3546 | ||
3547 | finish: | |
85254bcf DO |
3548 | /* Apply max_uV_step constraint if necessary */ |
3549 | if (state == PM_SUSPEND_ON) { | |
3550 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3551 | &desired_min_uV); | |
3552 | if (ret < 0) | |
3553 | return ret; | |
3554 | ||
3555 | if (ret == 0) | |
3556 | done = false; | |
3557 | } | |
3558 | ||
c054c6c7 MP |
3559 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3560 | if (n_coupled > 1 && *current_uV == -1) { | |
3561 | ||
3562 | if (_regulator_is_enabled(rdev)) { | |
3563 | ret = _regulator_get_voltage(rdev); | |
3564 | if (ret < 0) | |
3565 | return ret; | |
3566 | ||
3567 | *current_uV = ret; | |
3568 | } else { | |
3569 | *current_uV = desired_min_uV; | |
3570 | } | |
3571 | } | |
3572 | ||
3573 | *min_uV = desired_min_uV; | |
3574 | *max_uV = desired_max_uV; | |
3575 | ||
3576 | return done; | |
3577 | } | |
3578 | ||
3579 | static int regulator_balance_voltage(struct regulator_dev *rdev, | |
3580 | suspend_state_t state) | |
3581 | { | |
3582 | struct regulator_dev **c_rdevs; | |
3583 | struct regulator_dev *best_rdev; | |
3584 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3585 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
3586 | bool best_c_rdev_done, c_rdev_done[MAX_COUPLED]; | |
3587 | unsigned int delta, best_delta; | |
3588 | ||
3589 | c_rdevs = c_desc->coupled_rdevs; | |
3590 | n_coupled = c_desc->n_coupled; | |
3591 | ||
3592 | /* | |
3593 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3594 | * other coupled regulators. | |
3595 | */ | |
3596 | if (state != PM_SUSPEND_ON) | |
3597 | n_coupled = 1; | |
3598 | ||
3599 | if (c_desc->n_resolved < n_coupled) { | |
3600 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3601 | return -EPERM; | |
3602 | } | |
3603 | ||
3604 | for (i = 0; i < n_coupled; i++) | |
3605 | c_rdev_done[i] = false; | |
3606 | ||
3607 | /* | |
3608 | * Find the best possible voltage change on each loop. Leave the loop | |
3609 | * if there isn't any possible change. | |
3610 | */ | |
3611 | do { | |
3612 | best_c_rdev_done = false; | |
3613 | best_delta = 0; | |
3614 | best_min_uV = 0; | |
3615 | best_max_uV = 0; | |
3616 | best_c_rdev = 0; | |
3617 | best_rdev = NULL; | |
3618 | ||
3619 | /* | |
3620 | * Find highest difference between optimal voltage | |
3621 | * and current voltage. | |
3622 | */ | |
3623 | for (i = 0; i < n_coupled; i++) { | |
3624 | /* | |
3625 | * optimal_uV is the best voltage that can be set for | |
3626 | * i-th regulator at the moment without violating | |
3627 | * max_spread constraint in order to balance | |
3628 | * the coupled voltages. | |
3629 | */ | |
3630 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3631 | ||
3632 | if (c_rdev_done[i]) | |
3633 | continue; | |
3634 | ||
3635 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3636 | ¤t_uV, | |
3637 | &optimal_uV, | |
3638 | &optimal_max_uV, | |
3639 | state, n_coupled); | |
3640 | if (ret < 0) | |
3641 | goto out; | |
3642 | ||
3643 | delta = abs(optimal_uV - current_uV); | |
3644 | ||
3645 | if (delta && best_delta <= delta) { | |
3646 | best_c_rdev_done = ret; | |
3647 | best_delta = delta; | |
3648 | best_rdev = c_rdevs[i]; | |
3649 | best_min_uV = optimal_uV; | |
3650 | best_max_uV = optimal_max_uV; | |
3651 | best_c_rdev = i; | |
3652 | } | |
3653 | } | |
3654 | ||
3655 | /* Nothing to change, return successfully */ | |
3656 | if (!best_rdev) { | |
3657 | ret = 0; | |
3658 | goto out; | |
3659 | } | |
9243a195 | 3660 | |
c054c6c7 MP |
3661 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3662 | best_max_uV, state); | |
9243a195 | 3663 | |
c054c6c7 MP |
3664 | if (ret < 0) |
3665 | goto out; | |
3666 | ||
3667 | c_rdev_done[best_c_rdev] = best_c_rdev_done; | |
3668 | ||
3669 | } while (n_coupled > 1); | |
3670 | ||
3671 | out: | |
69686176 MP |
3672 | return ret; |
3673 | } | |
3674 | ||
a9f226bc SH |
3675 | /** |
3676 | * regulator_set_voltage - set regulator output voltage | |
3677 | * @regulator: regulator source | |
3678 | * @min_uV: Minimum required voltage in uV | |
3679 | * @max_uV: Maximum acceptable voltage in uV | |
3680 | * | |
3681 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3682 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3683 | * | |
3684 | * If the regulator is enabled then the voltage will change to the new value | |
3685 | * immediately otherwise if the regulator is disabled the regulator will | |
3686 | * output at the new voltage when enabled. | |
3687 | * | |
3688 | * NOTE: If the regulator is shared between several devices then the lowest | |
3689 | * request voltage that meets the system constraints will be used. | |
3690 | * Regulator system constraints must be set for this regulator before | |
3691 | * calling this function otherwise this call will fail. | |
3692 | */ | |
3693 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3694 | { | |
f8702f9e DO |
3695 | struct ww_acquire_ctx ww_ctx; |
3696 | int ret; | |
a9f226bc | 3697 | |
f8702f9e | 3698 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3699 | |
c360a6df CZ |
3700 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3701 | PM_SUSPEND_ON); | |
a9f226bc | 3702 | |
f8702f9e | 3703 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3704 | |
414c70cb LG |
3705 | return ret; |
3706 | } | |
3707 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3708 | ||
f7efad10 CZ |
3709 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3710 | suspend_state_t state, bool en) | |
3711 | { | |
3712 | struct regulator_state *rstate; | |
3713 | ||
3714 | rstate = regulator_get_suspend_state(rdev, state); | |
3715 | if (rstate == NULL) | |
3716 | return -EINVAL; | |
3717 | ||
3718 | if (!rstate->changeable) | |
3719 | return -EPERM; | |
3720 | ||
3edd79cf | 3721 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3722 | |
3723 | return 0; | |
3724 | } | |
3725 | ||
3726 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3727 | suspend_state_t state) | |
3728 | { | |
3729 | return regulator_suspend_toggle(rdev, state, true); | |
3730 | } | |
3731 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3732 | ||
3733 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3734 | suspend_state_t state) | |
3735 | { | |
3736 | struct regulator *regulator; | |
3737 | struct regulator_voltage *voltage; | |
3738 | ||
3739 | /* | |
3740 | * if any consumer wants this regulator device keeping on in | |
3741 | * suspend states, don't set it as disabled. | |
3742 | */ | |
3743 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3744 | voltage = ®ulator->voltage[state]; | |
3745 | if (voltage->min_uV || voltage->max_uV) | |
3746 | return 0; | |
3747 | } | |
3748 | ||
3749 | return regulator_suspend_toggle(rdev, state, false); | |
3750 | } | |
3751 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3752 | ||
3753 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3754 | int min_uV, int max_uV, | |
3755 | suspend_state_t state) | |
3756 | { | |
3757 | struct regulator_dev *rdev = regulator->rdev; | |
3758 | struct regulator_state *rstate; | |
3759 | ||
3760 | rstate = regulator_get_suspend_state(rdev, state); | |
3761 | if (rstate == NULL) | |
3762 | return -EINVAL; | |
3763 | ||
3764 | if (rstate->min_uV == rstate->max_uV) { | |
3765 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3766 | return -EPERM; | |
3767 | } | |
3768 | ||
3769 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3770 | } | |
3771 | ||
3772 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3773 | int max_uV, suspend_state_t state) | |
3774 | { | |
f8702f9e DO |
3775 | struct ww_acquire_ctx ww_ctx; |
3776 | int ret; | |
f7efad10 CZ |
3777 | |
3778 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3779 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3780 | return -EINVAL; | |
3781 | ||
f8702f9e | 3782 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3783 | |
3784 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3785 | max_uV, state); | |
3786 | ||
f8702f9e | 3787 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3788 | |
3789 | return ret; | |
3790 | } | |
3791 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3792 | ||
88cd222b LW |
3793 | /** |
3794 | * regulator_set_voltage_time - get raise/fall time | |
3795 | * @regulator: regulator source | |
3796 | * @old_uV: starting voltage in microvolts | |
3797 | * @new_uV: target voltage in microvolts | |
3798 | * | |
3799 | * Provided with the starting and ending voltage, this function attempts to | |
3800 | * calculate the time in microseconds required to rise or fall to this new | |
3801 | * voltage. | |
3802 | */ | |
3803 | int regulator_set_voltage_time(struct regulator *regulator, | |
3804 | int old_uV, int new_uV) | |
3805 | { | |
272e2315 GX |
3806 | struct regulator_dev *rdev = regulator->rdev; |
3807 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3808 | int old_sel = -1; |
3809 | int new_sel = -1; | |
3810 | int voltage; | |
3811 | int i; | |
3812 | ||
73e705bf MK |
3813 | if (ops->set_voltage_time) |
3814 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
3815 | else if (!ops->set_voltage_time_sel) | |
3816 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
3817 | ||
88cd222b | 3818 | /* Currently requires operations to do this */ |
73e705bf | 3819 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
3820 | return -EINVAL; |
3821 | ||
3822 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3823 | /* We only look for exact voltage matches here */ | |
3824 | voltage = regulator_list_voltage(regulator, i); | |
3825 | if (voltage < 0) | |
3826 | return -EINVAL; | |
3827 | if (voltage == 0) | |
3828 | continue; | |
3829 | if (voltage == old_uV) | |
3830 | old_sel = i; | |
3831 | if (voltage == new_uV) | |
3832 | new_sel = i; | |
3833 | } | |
3834 | ||
3835 | if (old_sel < 0 || new_sel < 0) | |
3836 | return -EINVAL; | |
3837 | ||
3838 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3839 | } | |
3840 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3841 | ||
98a175b6 | 3842 | /** |
296c6566 RD |
3843 | * regulator_set_voltage_time_sel - get raise/fall time |
3844 | * @rdev: regulator source device | |
98a175b6 YSB |
3845 | * @old_selector: selector for starting voltage |
3846 | * @new_selector: selector for target voltage | |
3847 | * | |
3848 | * Provided with the starting and target voltage selectors, this function | |
3849 | * returns time in microseconds required to rise or fall to this new voltage | |
3850 | * | |
f11d08c3 | 3851 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3852 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3853 | */ |
3854 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3855 | unsigned int old_selector, | |
3856 | unsigned int new_selector) | |
3857 | { | |
f11d08c3 | 3858 | int old_volt, new_volt; |
398715ab | 3859 | |
f11d08c3 AL |
3860 | /* sanity check */ |
3861 | if (!rdev->desc->ops->list_voltage) | |
3862 | return -EINVAL; | |
398715ab | 3863 | |
f11d08c3 AL |
3864 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3865 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3866 | ||
73e705bf MK |
3867 | if (rdev->desc->ops->set_voltage_time) |
3868 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
3869 | new_volt); | |
3870 | else | |
3871 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 3872 | } |
b19dbf71 | 3873 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3874 | |
606a2562 MB |
3875 | /** |
3876 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3877 | * @regulator: regulator source | |
3878 | * | |
3879 | * Re-apply the last configured voltage. This is intended to be used | |
3880 | * where some external control source the consumer is cooperating with | |
3881 | * has caused the configured voltage to change. | |
3882 | */ | |
3883 | int regulator_sync_voltage(struct regulator *regulator) | |
3884 | { | |
3885 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3886 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
3887 | int ret, min_uV, max_uV; |
3888 | ||
66cf9a7e | 3889 | regulator_lock(rdev); |
606a2562 MB |
3890 | |
3891 | if (!rdev->desc->ops->set_voltage && | |
3892 | !rdev->desc->ops->set_voltage_sel) { | |
3893 | ret = -EINVAL; | |
3894 | goto out; | |
3895 | } | |
3896 | ||
3897 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 3898 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
3899 | ret = -EINVAL; |
3900 | goto out; | |
3901 | } | |
3902 | ||
c360a6df CZ |
3903 | min_uV = voltage->min_uV; |
3904 | max_uV = voltage->max_uV; | |
606a2562 MB |
3905 | |
3906 | /* This should be a paranoia check... */ | |
3907 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3908 | if (ret < 0) | |
3909 | goto out; | |
3910 | ||
c360a6df | 3911 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
3912 | if (ret < 0) |
3913 | goto out; | |
3914 | ||
3915 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3916 | ||
3917 | out: | |
66cf9a7e | 3918 | regulator_unlock(rdev); |
606a2562 MB |
3919 | return ret; |
3920 | } | |
3921 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3922 | ||
414c70cb LG |
3923 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3924 | { | |
bf5892a8 | 3925 | int sel, ret; |
fef95019 MB |
3926 | bool bypassed; |
3927 | ||
3928 | if (rdev->desc->ops->get_bypass) { | |
3929 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
3930 | if (ret < 0) | |
3931 | return ret; | |
3932 | if (bypassed) { | |
3933 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
3934 | if (!rdev->supply) { |
3935 | rdev_err(rdev, | |
3936 | "bypassed regulator has no supply!\n"); | |
3937 | return -EPROBE_DEFER; | |
3938 | } | |
fef95019 MB |
3939 | |
3940 | return _regulator_get_voltage(rdev->supply->rdev); | |
3941 | } | |
3942 | } | |
476c2d83 MB |
3943 | |
3944 | if (rdev->desc->ops->get_voltage_sel) { | |
3945 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3946 | if (sel < 0) | |
3947 | return sel; | |
bf5892a8 | 3948 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3949 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3950 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3951 | } else if (rdev->desc->ops->list_voltage) { |
3952 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3953 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3954 | ret = rdev->desc->fixed_uV; | |
e303996e | 3955 | } else if (rdev->supply) { |
d9b96d35 | 3956 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3957 | } else { |
414c70cb | 3958 | return -EINVAL; |
cb220d16 | 3959 | } |
bf5892a8 | 3960 | |
cb220d16 AL |
3961 | if (ret < 0) |
3962 | return ret; | |
bf5892a8 | 3963 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3964 | } |
3965 | ||
3966 | /** | |
3967 | * regulator_get_voltage - get regulator output voltage | |
3968 | * @regulator: regulator source | |
3969 | * | |
3970 | * This returns the current regulator voltage in uV. | |
3971 | * | |
3972 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
3973 | * function should not be used to determine regulator state. | |
3974 | */ | |
3975 | int regulator_get_voltage(struct regulator *regulator) | |
3976 | { | |
f8702f9e | 3977 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
3978 | int ret; |
3979 | ||
f8702f9e | 3980 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
414c70cb | 3981 | ret = _regulator_get_voltage(regulator->rdev); |
f8702f9e | 3982 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
3983 | |
3984 | return ret; | |
3985 | } | |
3986 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
3987 | ||
3988 | /** | |
3989 | * regulator_set_current_limit - set regulator output current limit | |
3990 | * @regulator: regulator source | |
ce0d10f8 | 3991 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
3992 | * @max_uA: Maximum supported current in uA |
3993 | * | |
3994 | * Sets current sink to the desired output current. This can be set during | |
3995 | * any regulator state. IOW, regulator can be disabled or enabled. | |
3996 | * | |
3997 | * If the regulator is enabled then the current will change to the new value | |
3998 | * immediately otherwise if the regulator is disabled the regulator will | |
3999 | * output at the new current when enabled. | |
4000 | * | |
4001 | * NOTE: Regulator system constraints must be set for this regulator before | |
4002 | * calling this function otherwise this call will fail. | |
4003 | */ | |
4004 | int regulator_set_current_limit(struct regulator *regulator, | |
4005 | int min_uA, int max_uA) | |
4006 | { | |
4007 | struct regulator_dev *rdev = regulator->rdev; | |
4008 | int ret; | |
4009 | ||
66cf9a7e | 4010 | regulator_lock(rdev); |
414c70cb LG |
4011 | |
4012 | /* sanity check */ | |
4013 | if (!rdev->desc->ops->set_current_limit) { | |
4014 | ret = -EINVAL; | |
4015 | goto out; | |
4016 | } | |
4017 | ||
4018 | /* constraints check */ | |
4019 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4020 | if (ret < 0) | |
4021 | goto out; | |
4022 | ||
4023 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4024 | out: | |
66cf9a7e | 4025 | regulator_unlock(rdev); |
414c70cb LG |
4026 | return ret; |
4027 | } | |
4028 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4029 | ||
7e4d9683 DA |
4030 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4031 | { | |
4032 | /* sanity check */ | |
4033 | if (!rdev->desc->ops->get_current_limit) | |
4034 | return -EINVAL; | |
4035 | ||
4036 | return rdev->desc->ops->get_current_limit(rdev); | |
4037 | } | |
4038 | ||
414c70cb LG |
4039 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4040 | { | |
4041 | int ret; | |
4042 | ||
66cf9a7e | 4043 | regulator_lock(rdev); |
7e4d9683 | 4044 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4045 | regulator_unlock(rdev); |
7e4d9683 | 4046 | |
414c70cb LG |
4047 | return ret; |
4048 | } | |
4049 | ||
4050 | /** | |
4051 | * regulator_get_current_limit - get regulator output current | |
4052 | * @regulator: regulator source | |
4053 | * | |
4054 | * This returns the current supplied by the specified current sink in uA. | |
4055 | * | |
4056 | * NOTE: If the regulator is disabled it will return the current value. This | |
4057 | * function should not be used to determine regulator state. | |
4058 | */ | |
4059 | int regulator_get_current_limit(struct regulator *regulator) | |
4060 | { | |
4061 | return _regulator_get_current_limit(regulator->rdev); | |
4062 | } | |
4063 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4064 | ||
4065 | /** | |
4066 | * regulator_set_mode - set regulator operating mode | |
4067 | * @regulator: regulator source | |
4068 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4069 | * | |
4070 | * Set regulator operating mode to increase regulator efficiency or improve | |
4071 | * regulation performance. | |
4072 | * | |
4073 | * NOTE: Regulator system constraints must be set for this regulator before | |
4074 | * calling this function otherwise this call will fail. | |
4075 | */ | |
4076 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4077 | { | |
4078 | struct regulator_dev *rdev = regulator->rdev; | |
4079 | int ret; | |
500b4ac9 | 4080 | int regulator_curr_mode; |
414c70cb | 4081 | |
66cf9a7e | 4082 | regulator_lock(rdev); |
414c70cb LG |
4083 | |
4084 | /* sanity check */ | |
4085 | if (!rdev->desc->ops->set_mode) { | |
4086 | ret = -EINVAL; | |
4087 | goto out; | |
4088 | } | |
4089 | ||
500b4ac9 SI |
4090 | /* return if the same mode is requested */ |
4091 | if (rdev->desc->ops->get_mode) { | |
4092 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4093 | if (regulator_curr_mode == mode) { | |
4094 | ret = 0; | |
4095 | goto out; | |
4096 | } | |
4097 | } | |
4098 | ||
414c70cb | 4099 | /* constraints check */ |
22c51b47 | 4100 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4101 | if (ret < 0) |
4102 | goto out; | |
4103 | ||
4104 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4105 | out: | |
66cf9a7e | 4106 | regulator_unlock(rdev); |
414c70cb LG |
4107 | return ret; |
4108 | } | |
4109 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4110 | ||
7e4d9683 DA |
4111 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4112 | { | |
4113 | /* sanity check */ | |
4114 | if (!rdev->desc->ops->get_mode) | |
4115 | return -EINVAL; | |
4116 | ||
4117 | return rdev->desc->ops->get_mode(rdev); | |
4118 | } | |
4119 | ||
414c70cb LG |
4120 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4121 | { | |
4122 | int ret; | |
4123 | ||
66cf9a7e | 4124 | regulator_lock(rdev); |
7e4d9683 | 4125 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4126 | regulator_unlock(rdev); |
7e4d9683 | 4127 | |
414c70cb LG |
4128 | return ret; |
4129 | } | |
4130 | ||
4131 | /** | |
4132 | * regulator_get_mode - get regulator operating mode | |
4133 | * @regulator: regulator source | |
4134 | * | |
4135 | * Get the current regulator operating mode. | |
4136 | */ | |
4137 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4138 | { | |
4139 | return _regulator_get_mode(regulator->rdev); | |
4140 | } | |
4141 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4142 | ||
1b5b4221 AH |
4143 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4144 | unsigned int *flags) | |
4145 | { | |
4146 | int ret; | |
4147 | ||
66cf9a7e | 4148 | regulator_lock(rdev); |
1b5b4221 AH |
4149 | |
4150 | /* sanity check */ | |
4151 | if (!rdev->desc->ops->get_error_flags) { | |
4152 | ret = -EINVAL; | |
4153 | goto out; | |
4154 | } | |
4155 | ||
4156 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4157 | out: | |
66cf9a7e | 4158 | regulator_unlock(rdev); |
1b5b4221 AH |
4159 | return ret; |
4160 | } | |
4161 | ||
4162 | /** | |
4163 | * regulator_get_error_flags - get regulator error information | |
4164 | * @regulator: regulator source | |
4165 | * @flags: pointer to store error flags | |
4166 | * | |
4167 | * Get the current regulator error information. | |
4168 | */ | |
4169 | int regulator_get_error_flags(struct regulator *regulator, | |
4170 | unsigned int *flags) | |
4171 | { | |
4172 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4173 | } | |
4174 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4175 | ||
414c70cb | 4176 | /** |
e39ce48f | 4177 | * regulator_set_load - set regulator load |
414c70cb LG |
4178 | * @regulator: regulator source |
4179 | * @uA_load: load current | |
4180 | * | |
4181 | * Notifies the regulator core of a new device load. This is then used by | |
4182 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4183 | * operating mode for the new regulator loading. | |
4184 | * | |
4185 | * Consumer devices notify their supply regulator of the maximum power | |
4186 | * they will require (can be taken from device datasheet in the power | |
4187 | * consumption tables) when they change operational status and hence power | |
4188 | * state. Examples of operational state changes that can affect power | |
4189 | * consumption are :- | |
4190 | * | |
4191 | * o Device is opened / closed. | |
4192 | * o Device I/O is about to begin or has just finished. | |
4193 | * o Device is idling in between work. | |
4194 | * | |
4195 | * This information is also exported via sysfs to userspace. | |
4196 | * | |
4197 | * DRMS will sum the total requested load on the regulator and change | |
4198 | * to the most efficient operating mode if platform constraints allow. | |
4199 | * | |
5451781d DA |
4200 | * NOTE: when a regulator consumer requests to have a regulator |
4201 | * disabled then any load that consumer requested no longer counts | |
4202 | * toward the total requested load. If the regulator is re-enabled | |
4203 | * then the previously requested load will start counting again. | |
4204 | * | |
4205 | * If a regulator is an always-on regulator then an individual consumer's | |
4206 | * load will still be removed if that consumer is fully disabled. | |
4207 | * | |
e39ce48f | 4208 | * On error a negative errno is returned. |
414c70cb | 4209 | */ |
e39ce48f | 4210 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4211 | { |
4212 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4213 | int old_uA_load; |
4214 | int ret = 0; | |
d92d95b6 | 4215 | |
66cf9a7e | 4216 | regulator_lock(rdev); |
5451781d | 4217 | old_uA_load = regulator->uA_load; |
414c70cb | 4218 | regulator->uA_load = uA_load; |
5451781d DA |
4219 | if (regulator->enable_count && old_uA_load != uA_load) { |
4220 | ret = drms_uA_update(rdev); | |
4221 | if (ret < 0) | |
4222 | regulator->uA_load = old_uA_load; | |
4223 | } | |
66cf9a7e | 4224 | regulator_unlock(rdev); |
8460ef38 | 4225 | |
414c70cb LG |
4226 | return ret; |
4227 | } | |
e39ce48f | 4228 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4229 | |
f59c8f9f MB |
4230 | /** |
4231 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4232 | * | |
4233 | * @regulator: Regulator to configure | |
9345dfb8 | 4234 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4235 | * |
4236 | * Allow the regulator to go into bypass mode if all other consumers | |
4237 | * for the regulator also enable bypass mode and the machine | |
4238 | * constraints allow this. Bypass mode means that the regulator is | |
4239 | * simply passing the input directly to the output with no regulation. | |
4240 | */ | |
4241 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4242 | { | |
4243 | struct regulator_dev *rdev = regulator->rdev; | |
4244 | int ret = 0; | |
4245 | ||
4246 | if (!rdev->desc->ops->set_bypass) | |
4247 | return 0; | |
4248 | ||
8a34e979 | 4249 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4250 | return 0; |
4251 | ||
66cf9a7e | 4252 | regulator_lock(rdev); |
f59c8f9f MB |
4253 | |
4254 | if (enable && !regulator->bypass) { | |
4255 | rdev->bypass_count++; | |
4256 | ||
4257 | if (rdev->bypass_count == rdev->open_count) { | |
4258 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4259 | if (ret != 0) | |
4260 | rdev->bypass_count--; | |
4261 | } | |
4262 | ||
4263 | } else if (!enable && regulator->bypass) { | |
4264 | rdev->bypass_count--; | |
4265 | ||
4266 | if (rdev->bypass_count != rdev->open_count) { | |
4267 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4268 | if (ret != 0) | |
4269 | rdev->bypass_count++; | |
4270 | } | |
4271 | } | |
4272 | ||
4273 | if (ret == 0) | |
4274 | regulator->bypass = enable; | |
4275 | ||
66cf9a7e | 4276 | regulator_unlock(rdev); |
f59c8f9f MB |
4277 | |
4278 | return ret; | |
4279 | } | |
4280 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4281 | ||
414c70cb LG |
4282 | /** |
4283 | * regulator_register_notifier - register regulator event notifier | |
4284 | * @regulator: regulator source | |
69279fb9 | 4285 | * @nb: notifier block |
414c70cb LG |
4286 | * |
4287 | * Register notifier block to receive regulator events. | |
4288 | */ | |
4289 | int regulator_register_notifier(struct regulator *regulator, | |
4290 | struct notifier_block *nb) | |
4291 | { | |
4292 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4293 | nb); | |
4294 | } | |
4295 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4296 | ||
4297 | /** | |
4298 | * regulator_unregister_notifier - unregister regulator event notifier | |
4299 | * @regulator: regulator source | |
69279fb9 | 4300 | * @nb: notifier block |
414c70cb LG |
4301 | * |
4302 | * Unregister regulator event notifier block. | |
4303 | */ | |
4304 | int regulator_unregister_notifier(struct regulator *regulator, | |
4305 | struct notifier_block *nb) | |
4306 | { | |
4307 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4308 | nb); | |
4309 | } | |
4310 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4311 | ||
b136fb44 JC |
4312 | /* notify regulator consumers and downstream regulator consumers. |
4313 | * Note mutex must be held by caller. | |
4314 | */ | |
7179569a | 4315 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4316 | unsigned long event, void *data) |
4317 | { | |
414c70cb | 4318 | /* call rdev chain first */ |
7179569a | 4319 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4320 | } |
4321 | ||
4322 | /** | |
4323 | * regulator_bulk_get - get multiple regulator consumers | |
4324 | * | |
4325 | * @dev: Device to supply | |
4326 | * @num_consumers: Number of consumers to register | |
4327 | * @consumers: Configuration of consumers; clients are stored here. | |
4328 | * | |
4329 | * @return 0 on success, an errno on failure. | |
4330 | * | |
4331 | * This helper function allows drivers to get several regulator | |
4332 | * consumers in one operation. If any of the regulators cannot be | |
4333 | * acquired then any regulators that were allocated will be freed | |
4334 | * before returning to the caller. | |
4335 | */ | |
4336 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4337 | struct regulator_bulk_data *consumers) | |
4338 | { | |
4339 | int i; | |
4340 | int ret; | |
4341 | ||
4342 | for (i = 0; i < num_consumers; i++) | |
4343 | consumers[i].consumer = NULL; | |
4344 | ||
4345 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4346 | consumers[i].consumer = regulator_get(dev, |
4347 | consumers[i].supply); | |
414c70cb | 4348 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 4349 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
4350 | dev_err(dev, "Failed to get supply '%s': %d\n", |
4351 | consumers[i].supply, ret); | |
414c70cb LG |
4352 | consumers[i].consumer = NULL; |
4353 | goto err; | |
4354 | } | |
4355 | } | |
4356 | ||
4357 | return 0; | |
4358 | ||
4359 | err: | |
b29c7690 | 4360 | while (--i >= 0) |
414c70cb LG |
4361 | regulator_put(consumers[i].consumer); |
4362 | ||
4363 | return ret; | |
4364 | } | |
4365 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4366 | ||
f21e0e81 MB |
4367 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4368 | { | |
4369 | struct regulator_bulk_data *bulk = data; | |
4370 | ||
4371 | bulk->ret = regulator_enable(bulk->consumer); | |
4372 | } | |
4373 | ||
414c70cb LG |
4374 | /** |
4375 | * regulator_bulk_enable - enable multiple regulator consumers | |
4376 | * | |
4377 | * @num_consumers: Number of consumers | |
4378 | * @consumers: Consumer data; clients are stored here. | |
4379 | * @return 0 on success, an errno on failure | |
4380 | * | |
4381 | * This convenience API allows consumers to enable multiple regulator | |
4382 | * clients in a single API call. If any consumers cannot be enabled | |
4383 | * then any others that were enabled will be disabled again prior to | |
4384 | * return. | |
4385 | */ | |
4386 | int regulator_bulk_enable(int num_consumers, | |
4387 | struct regulator_bulk_data *consumers) | |
4388 | { | |
2955b47d | 4389 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4390 | int i; |
f21e0e81 | 4391 | int ret = 0; |
414c70cb | 4392 | |
6492bc1b | 4393 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4394 | async_schedule_domain(regulator_bulk_enable_async, |
4395 | &consumers[i], &async_domain); | |
6492bc1b | 4396 | } |
f21e0e81 MB |
4397 | |
4398 | async_synchronize_full_domain(&async_domain); | |
4399 | ||
4400 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4401 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4402 | if (consumers[i].ret != 0) { |
4403 | ret = consumers[i].ret; | |
414c70cb | 4404 | goto err; |
f21e0e81 | 4405 | } |
414c70cb LG |
4406 | } |
4407 | ||
4408 | return 0; | |
4409 | ||
4410 | err: | |
fbe31057 AH |
4411 | for (i = 0; i < num_consumers; i++) { |
4412 | if (consumers[i].ret < 0) | |
4413 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
4414 | consumers[i].ret); | |
4415 | else | |
4416 | regulator_disable(consumers[i].consumer); | |
4417 | } | |
414c70cb LG |
4418 | |
4419 | return ret; | |
4420 | } | |
4421 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4422 | ||
4423 | /** | |
4424 | * regulator_bulk_disable - disable multiple regulator consumers | |
4425 | * | |
4426 | * @num_consumers: Number of consumers | |
4427 | * @consumers: Consumer data; clients are stored here. | |
4428 | * @return 0 on success, an errno on failure | |
4429 | * | |
4430 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4431 | * clients in a single API call. If any consumers cannot be disabled |
4432 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4433 | * return. |
4434 | */ | |
4435 | int regulator_bulk_disable(int num_consumers, | |
4436 | struct regulator_bulk_data *consumers) | |
4437 | { | |
4438 | int i; | |
01e86f49 | 4439 | int ret, r; |
414c70cb | 4440 | |
49e22632 | 4441 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4442 | ret = regulator_disable(consumers[i].consumer); |
4443 | if (ret != 0) | |
4444 | goto err; | |
4445 | } | |
4446 | ||
4447 | return 0; | |
4448 | ||
4449 | err: | |
5da84fd9 | 4450 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
4451 | for (++i; i < num_consumers; ++i) { |
4452 | r = regulator_enable(consumers[i].consumer); | |
4453 | if (r != 0) | |
d1642ea7 | 4454 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
4455 | consumers[i].supply, r); |
4456 | } | |
414c70cb LG |
4457 | |
4458 | return ret; | |
4459 | } | |
4460 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4461 | ||
e1de2f42 DK |
4462 | /** |
4463 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4464 | * | |
4465 | * @num_consumers: Number of consumers | |
4466 | * @consumers: Consumer data; clients are stored here. | |
4467 | * @return 0 on success, an errno on failure | |
4468 | * | |
4469 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4470 | * clients in a single API call. | |
4471 | * NOTE: This should be used for situations when device damage will | |
4472 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4473 | * Although regulator_force_disable function call for some consumers can | |
4474 | * return error numbers, the function is called for all consumers. | |
4475 | */ | |
4476 | int regulator_bulk_force_disable(int num_consumers, | |
4477 | struct regulator_bulk_data *consumers) | |
4478 | { | |
4479 | int i; | |
b8c77ff6 | 4480 | int ret = 0; |
e1de2f42 | 4481 | |
b8c77ff6 | 4482 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4483 | consumers[i].ret = |
4484 | regulator_force_disable(consumers[i].consumer); | |
4485 | ||
b8c77ff6 DT |
4486 | /* Store first error for reporting */ |
4487 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4488 | ret = consumers[i].ret; |
e1de2f42 DK |
4489 | } |
4490 | ||
e1de2f42 DK |
4491 | return ret; |
4492 | } | |
4493 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4494 | ||
414c70cb LG |
4495 | /** |
4496 | * regulator_bulk_free - free multiple regulator consumers | |
4497 | * | |
4498 | * @num_consumers: Number of consumers | |
4499 | * @consumers: Consumer data; clients are stored here. | |
4500 | * | |
4501 | * This convenience API allows consumers to free multiple regulator | |
4502 | * clients in a single API call. | |
4503 | */ | |
4504 | void regulator_bulk_free(int num_consumers, | |
4505 | struct regulator_bulk_data *consumers) | |
4506 | { | |
4507 | int i; | |
4508 | ||
4509 | for (i = 0; i < num_consumers; i++) { | |
4510 | regulator_put(consumers[i].consumer); | |
4511 | consumers[i].consumer = NULL; | |
4512 | } | |
4513 | } | |
4514 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4515 | ||
4516 | /** | |
4517 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4518 | * @rdev: regulator source |
414c70cb | 4519 | * @event: notifier block |
69279fb9 | 4520 | * @data: callback-specific data. |
414c70cb LG |
4521 | * |
4522 | * Called by regulator drivers to notify clients a regulator event has | |
4523 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 4524 | * Note lock must be held by caller. |
414c70cb LG |
4525 | */ |
4526 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4527 | unsigned long event, void *data) | |
4528 | { | |
f8702f9e | 4529 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 4530 | |
414c70cb LG |
4531 | _notifier_call_chain(rdev, event, data); |
4532 | return NOTIFY_DONE; | |
4533 | ||
4534 | } | |
4535 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4536 | ||
be721979 MB |
4537 | /** |
4538 | * regulator_mode_to_status - convert a regulator mode into a status | |
4539 | * | |
4540 | * @mode: Mode to convert | |
4541 | * | |
4542 | * Convert a regulator mode into a status. | |
4543 | */ | |
4544 | int regulator_mode_to_status(unsigned int mode) | |
4545 | { | |
4546 | switch (mode) { | |
4547 | case REGULATOR_MODE_FAST: | |
4548 | return REGULATOR_STATUS_FAST; | |
4549 | case REGULATOR_MODE_NORMAL: | |
4550 | return REGULATOR_STATUS_NORMAL; | |
4551 | case REGULATOR_MODE_IDLE: | |
4552 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4553 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4554 | return REGULATOR_STATUS_STANDBY; |
4555 | default: | |
1beaf762 | 4556 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4557 | } |
4558 | } | |
4559 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4560 | ||
39f802d6 TI |
4561 | static struct attribute *regulator_dev_attrs[] = { |
4562 | &dev_attr_name.attr, | |
4563 | &dev_attr_num_users.attr, | |
4564 | &dev_attr_type.attr, | |
4565 | &dev_attr_microvolts.attr, | |
4566 | &dev_attr_microamps.attr, | |
4567 | &dev_attr_opmode.attr, | |
4568 | &dev_attr_state.attr, | |
4569 | &dev_attr_status.attr, | |
4570 | &dev_attr_bypass.attr, | |
4571 | &dev_attr_requested_microamps.attr, | |
4572 | &dev_attr_min_microvolts.attr, | |
4573 | &dev_attr_max_microvolts.attr, | |
4574 | &dev_attr_min_microamps.attr, | |
4575 | &dev_attr_max_microamps.attr, | |
4576 | &dev_attr_suspend_standby_state.attr, | |
4577 | &dev_attr_suspend_mem_state.attr, | |
4578 | &dev_attr_suspend_disk_state.attr, | |
4579 | &dev_attr_suspend_standby_microvolts.attr, | |
4580 | &dev_attr_suspend_mem_microvolts.attr, | |
4581 | &dev_attr_suspend_disk_microvolts.attr, | |
4582 | &dev_attr_suspend_standby_mode.attr, | |
4583 | &dev_attr_suspend_mem_mode.attr, | |
4584 | &dev_attr_suspend_disk_mode.attr, | |
4585 | NULL | |
4586 | }; | |
4587 | ||
7ad68e2f DB |
4588 | /* |
4589 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4590 | * create attributes that can be meaningfully displayed. | |
4591 | */ | |
39f802d6 TI |
4592 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4593 | struct attribute *attr, int idx) | |
7ad68e2f | 4594 | { |
39f802d6 | 4595 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4596 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4597 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4598 | umode_t mode = attr->mode; |
4599 | ||
4600 | /* these three are always present */ | |
4601 | if (attr == &dev_attr_name.attr || | |
4602 | attr == &dev_attr_num_users.attr || | |
4603 | attr == &dev_attr_type.attr) | |
4604 | return mode; | |
7ad68e2f DB |
4605 | |
4606 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4607 | if (attr == &dev_attr_microvolts.attr) { |
4608 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4609 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4610 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4611 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4612 | return mode; | |
4613 | return 0; | |
f59c8f9f | 4614 | } |
7ad68e2f | 4615 | |
39f802d6 TI |
4616 | if (attr == &dev_attr_microamps.attr) |
4617 | return ops->get_current_limit ? mode : 0; | |
4618 | ||
4619 | if (attr == &dev_attr_opmode.attr) | |
4620 | return ops->get_mode ? mode : 0; | |
4621 | ||
4622 | if (attr == &dev_attr_state.attr) | |
4623 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4624 | ||
4625 | if (attr == &dev_attr_status.attr) | |
4626 | return ops->get_status ? mode : 0; | |
4627 | ||
4628 | if (attr == &dev_attr_bypass.attr) | |
4629 | return ops->get_bypass ? mode : 0; | |
4630 | ||
7ad68e2f | 4631 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4632 | if (attr == &dev_attr_min_microvolts.attr || |
4633 | attr == &dev_attr_max_microvolts.attr) | |
4634 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4635 | ||
4636 | if (attr == &dev_attr_min_microamps.attr || | |
4637 | attr == &dev_attr_max_microamps.attr) | |
4638 | return ops->set_current_limit ? mode : 0; | |
4639 | ||
4640 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4641 | attr == &dev_attr_suspend_mem_state.attr || | |
4642 | attr == &dev_attr_suspend_disk_state.attr) | |
4643 | return mode; | |
4644 | ||
4645 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4646 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4647 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4648 | return ops->set_suspend_voltage ? mode : 0; | |
4649 | ||
4650 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4651 | attr == &dev_attr_suspend_mem_mode.attr || | |
4652 | attr == &dev_attr_suspend_disk_mode.attr) | |
4653 | return ops->set_suspend_mode ? mode : 0; | |
4654 | ||
4655 | return mode; | |
4656 | } | |
4657 | ||
4658 | static const struct attribute_group regulator_dev_group = { | |
4659 | .attrs = regulator_dev_attrs, | |
4660 | .is_visible = regulator_attr_is_visible, | |
4661 | }; | |
4662 | ||
4663 | static const struct attribute_group *regulator_dev_groups[] = { | |
4664 | ®ulator_dev_group, | |
4665 | NULL | |
4666 | }; | |
7ad68e2f | 4667 | |
39f802d6 TI |
4668 | static void regulator_dev_release(struct device *dev) |
4669 | { | |
4670 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4671 | |
4672 | kfree(rdev->constraints); | |
4673 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4674 | kfree(rdev); |
7ad68e2f DB |
4675 | } |
4676 | ||
1130e5b3 MB |
4677 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4678 | { | |
a9eaa813 GR |
4679 | struct device *parent = rdev->dev.parent; |
4680 | const char *rname = rdev_get_name(rdev); | |
4681 | char name[NAME_MAX]; | |
4682 | ||
4683 | /* Avoid duplicate debugfs directory names */ | |
4684 | if (parent && rname == rdev->desc->name) { | |
4685 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4686 | rname); | |
4687 | rname = name; | |
4688 | } | |
4689 | ||
4690 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4691 | if (!rdev->debugfs) { |
1130e5b3 | 4692 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4693 | return; |
4694 | } | |
4695 | ||
4696 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4697 | &rdev->use_count); | |
4698 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4699 | &rdev->open_count); | |
f59c8f9f MB |
4700 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4701 | &rdev->bypass_count); | |
1130e5b3 MB |
4702 | } |
4703 | ||
5e3ca2b3 JMC |
4704 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4705 | { | |
7ddede6a JH |
4706 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4707 | ||
4708 | if (regulator_resolve_supply(rdev)) | |
4709 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4710 | ||
4711 | return 0; | |
5e3ca2b3 JMC |
4712 | } |
4713 | ||
f9503385 | 4714 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4715 | { |
4716 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
4717 | int n_coupled = c_desc->n_coupled; | |
4718 | struct regulator_dev *c_rdev; | |
4719 | int i; | |
4720 | ||
4721 | for (i = 1; i < n_coupled; i++) { | |
4722 | /* already resolved */ | |
4723 | if (c_desc->coupled_rdevs[i]) | |
4724 | continue; | |
4725 | ||
4726 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
4727 | ||
f9503385 DO |
4728 | if (!c_rdev) |
4729 | continue; | |
d3d64537 | 4730 | |
f9503385 | 4731 | regulator_lock(c_rdev); |
d3d64537 | 4732 | |
f9503385 DO |
4733 | c_desc->coupled_rdevs[i] = c_rdev; |
4734 | c_desc->n_resolved++; | |
d3d64537 | 4735 | |
f9503385 | 4736 | regulator_unlock(c_rdev); |
d3d64537 | 4737 | |
f9503385 DO |
4738 | regulator_resolve_coupling(c_rdev); |
4739 | } | |
d3d64537 MP |
4740 | } |
4741 | ||
6303f3e7 | 4742 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 4743 | { |
6303f3e7 DO |
4744 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
4745 | struct regulator_dev *__c_rdev, *c_rdev; | |
4746 | unsigned int __n_coupled, n_coupled; | |
4747 | int i, k; | |
d3d64537 | 4748 | |
6303f3e7 | 4749 | n_coupled = c_desc->n_coupled; |
d3d64537 | 4750 | |
6303f3e7 DO |
4751 | for (i = 1; i < n_coupled; i++) { |
4752 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 4753 | |
6303f3e7 DO |
4754 | if (!c_rdev) |
4755 | continue; | |
4756 | ||
4757 | regulator_lock(c_rdev); | |
4758 | ||
4759 | __c_desc = &c_rdev->coupling_desc; | |
4760 | __n_coupled = __c_desc->n_coupled; | |
4761 | ||
4762 | for (k = 1; k < __n_coupled; k++) { | |
4763 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
4764 | ||
4765 | if (__c_rdev == rdev) { | |
4766 | __c_desc->coupled_rdevs[k] = NULL; | |
4767 | __c_desc->n_resolved--; | |
4768 | break; | |
4769 | } | |
4770 | } | |
4771 | ||
4772 | regulator_unlock(c_rdev); | |
4773 | ||
4774 | c_desc->coupled_rdevs[i] = NULL; | |
4775 | c_desc->n_resolved--; | |
4776 | } | |
d3d64537 MP |
4777 | } |
4778 | ||
f9503385 | 4779 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4780 | { |
4781 | int n_phandles; | |
4782 | ||
4783 | if (!IS_ENABLED(CONFIG_OF)) | |
4784 | n_phandles = 0; | |
4785 | else | |
4786 | n_phandles = of_get_n_coupled(rdev); | |
4787 | ||
4788 | if (n_phandles + 1 > MAX_COUPLED) { | |
4789 | rdev_err(rdev, "too many regulators coupled\n"); | |
4790 | return -EPERM; | |
4791 | } | |
4792 | ||
4793 | /* | |
4794 | * Every regulator should always have coupling descriptor filled with | |
4795 | * at least pointer to itself. | |
4796 | */ | |
4797 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
4798 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
4799 | rdev->coupling_desc.n_resolved++; | |
4800 | ||
4801 | /* regulator isn't coupled */ | |
4802 | if (n_phandles == 0) | |
4803 | return 0; | |
4804 | ||
4805 | /* regulator, which can't change its voltage, can't be coupled */ | |
4806 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { | |
4807 | rdev_err(rdev, "voltage operation not allowed\n"); | |
4808 | return -EPERM; | |
4809 | } | |
4810 | ||
4811 | if (rdev->constraints->max_spread <= 0) { | |
4812 | rdev_err(rdev, "wrong max_spread value\n"); | |
4813 | return -EPERM; | |
4814 | } | |
4815 | ||
4816 | if (!of_check_coupling_data(rdev)) | |
4817 | return -EPERM; | |
4818 | ||
d3d64537 MP |
4819 | return 0; |
4820 | } | |
4821 | ||
414c70cb LG |
4822 | /** |
4823 | * regulator_register - register regulator | |
69279fb9 | 4824 | * @regulator_desc: regulator to register |
f47531b1 | 4825 | * @cfg: runtime configuration for regulator |
414c70cb LG |
4826 | * |
4827 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
4828 | * Returns a valid pointer to struct regulator_dev on success |
4829 | * or an ERR_PTR() on error. | |
414c70cb | 4830 | */ |
65f26846 MB |
4831 | struct regulator_dev * |
4832 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 4833 | const struct regulator_config *cfg) |
414c70cb | 4834 | { |
9a8f5e07 | 4835 | const struct regulation_constraints *constraints = NULL; |
c172708d | 4836 | const struct regulator_init_data *init_data; |
1b3de223 | 4837 | struct regulator_config *config = NULL; |
72dca06f | 4838 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 4839 | struct regulator_dev *rdev; |
0edb040d LW |
4840 | bool dangling_cfg_gpiod = false; |
4841 | bool dangling_of_gpiod = false; | |
32c8fad4 | 4842 | struct device *dev; |
a5766f11 | 4843 | int ret, i; |
414c70cb | 4844 | |
0edb040d | 4845 | if (cfg == NULL) |
414c70cb | 4846 | return ERR_PTR(-EINVAL); |
0edb040d LW |
4847 | if (cfg->ena_gpiod) |
4848 | dangling_cfg_gpiod = true; | |
4849 | if (regulator_desc == NULL) { | |
4850 | ret = -EINVAL; | |
4851 | goto rinse; | |
4852 | } | |
414c70cb | 4853 | |
1b3de223 | 4854 | dev = cfg->dev; |
dcf70112 | 4855 | WARN_ON(!dev); |
32c8fad4 | 4856 | |
0edb040d LW |
4857 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
4858 | ret = -EINVAL; | |
4859 | goto rinse; | |
4860 | } | |
414c70cb | 4861 | |
cd78dfc6 | 4862 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
4863 | regulator_desc->type != REGULATOR_CURRENT) { |
4864 | ret = -EINVAL; | |
4865 | goto rinse; | |
4866 | } | |
414c70cb | 4867 | |
476c2d83 MB |
4868 | /* Only one of each should be implemented */ |
4869 | WARN_ON(regulator_desc->ops->get_voltage && | |
4870 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
4871 | WARN_ON(regulator_desc->ops->set_voltage && |
4872 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
4873 | |
4874 | /* If we're using selectors we must implement list_voltage. */ | |
4875 | if (regulator_desc->ops->get_voltage_sel && | |
4876 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
4877 | ret = -EINVAL; |
4878 | goto rinse; | |
476c2d83 | 4879 | } |
e8eef82b MB |
4880 | if (regulator_desc->ops->set_voltage_sel && |
4881 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
4882 | ret = -EINVAL; |
4883 | goto rinse; | |
e8eef82b | 4884 | } |
476c2d83 | 4885 | |
414c70cb | 4886 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
4887 | if (rdev == NULL) { |
4888 | ret = -ENOMEM; | |
4889 | goto rinse; | |
4890 | } | |
414c70cb | 4891 | |
1b3de223 KK |
4892 | /* |
4893 | * Duplicate the config so the driver could override it after | |
4894 | * parsing init data. | |
4895 | */ | |
4896 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
4897 | if (config == NULL) { | |
4898 | kfree(rdev); | |
0edb040d LW |
4899 | ret = -ENOMEM; |
4900 | goto rinse; | |
1b3de223 KK |
4901 | } |
4902 | ||
bfa21a0d | 4903 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 4904 | &rdev->dev.of_node); |
0edb040d LW |
4905 | /* |
4906 | * We need to keep track of any GPIO descriptor coming from the | |
4907 | * device tree until we have handled it over to the core. If the | |
4908 | * config that was passed in to this function DOES NOT contain | |
4909 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 4910 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
4911 | * tree. |
4912 | */ | |
4913 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
4914 | dangling_of_gpiod = true; | |
a0c7b164 MB |
4915 | if (!init_data) { |
4916 | init_data = config->init_data; | |
4917 | rdev->dev.of_node = of_node_get(config->of_node); | |
4918 | } | |
4919 | ||
f8702f9e | 4920 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 4921 | rdev->reg_data = config->driver_data; |
414c70cb LG |
4922 | rdev->owner = regulator_desc->owner; |
4923 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
4924 | if (config->regmap) |
4925 | rdev->regmap = config->regmap; | |
52b84dac | 4926 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 4927 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
4928 | else if (dev->parent) |
4929 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 4930 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 4931 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 4932 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 4933 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 4934 | |
a5766f11 | 4935 | /* preform any regulator specific init */ |
9a8f5e07 | 4936 | if (init_data && init_data->regulator_init) { |
a5766f11 | 4937 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
4938 | if (ret < 0) |
4939 | goto clean; | |
a5766f11 LG |
4940 | } |
4941 | ||
541d052d | 4942 | if (config->ena_gpiod) { |
45389c47 | 4943 | mutex_lock(®ulator_list_mutex); |
daad134d | 4944 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 4945 | mutex_unlock(®ulator_list_mutex); |
daad134d | 4946 | if (ret != 0) { |
541d052d LW |
4947 | rdev_err(rdev, "Failed to request enable GPIO: %d\n", |
4948 | ret); | |
32165230 | 4949 | goto clean; |
daad134d | 4950 | } |
0edb040d LW |
4951 | /* The regulator core took over the GPIO descriptor */ |
4952 | dangling_cfg_gpiod = false; | |
4953 | dangling_of_gpiod = false; | |
daad134d KA |
4954 | } |
4955 | ||
a5766f11 | 4956 | /* register with sysfs */ |
414c70cb | 4957 | rdev->dev.class = ®ulator_class; |
a5766f11 | 4958 | rdev->dev.parent = dev; |
72dca06f | 4959 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 4960 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 4961 | |
74f544c1 | 4962 | /* set regulator constraints */ |
9a8f5e07 MB |
4963 | if (init_data) |
4964 | constraints = &init_data->constraints; | |
4965 | ||
9a8f5e07 | 4966 | if (init_data && init_data->supply_regulator) |
6261b06d | 4967 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 4968 | else if (regulator_desc->supply_name) |
6261b06d | 4969 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 4970 | |
45389c47 JH |
4971 | /* |
4972 | * Attempt to resolve the regulator supply, if specified, | |
4973 | * but don't return an error if we fail because we will try | |
4974 | * to resolve it again later as more regulators are added. | |
4975 | */ | |
4976 | if (regulator_resolve_supply(rdev)) | |
4977 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4978 | ||
4979 | ret = set_machine_constraints(rdev, constraints); | |
4980 | if (ret < 0) | |
4981 | goto wash; | |
4982 | ||
f9503385 DO |
4983 | ret = regulator_init_coupling(rdev); |
4984 | if (ret < 0) | |
d3d64537 MP |
4985 | goto wash; |
4986 | ||
a5766f11 | 4987 | /* add consumers devices */ |
9a8f5e07 | 4988 | if (init_data) { |
45389c47 | 4989 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
4990 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
4991 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 4992 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 4993 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 4994 | if (ret < 0) { |
45389c47 | 4995 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
4996 | dev_err(dev, "Failed to set supply %s\n", |
4997 | init_data->consumer_supplies[i].supply); | |
4998 | goto unset_supplies; | |
4999 | } | |
23c2f041 | 5000 | } |
45389c47 | 5001 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 5002 | } |
a5766f11 | 5003 | |
fd086045 MK |
5004 | if (!rdev->desc->ops->get_voltage && |
5005 | !rdev->desc->ops->list_voltage && | |
5006 | !rdev->desc->fixed_uV) | |
5007 | rdev->is_switch = true; | |
5008 | ||
fb6de923 | 5009 | dev_set_drvdata(&rdev->dev, rdev); |
c438b9d0 JH |
5010 | ret = device_register(&rdev->dev); |
5011 | if (ret != 0) { | |
5012 | put_device(&rdev->dev); | |
5013 | goto unset_supplies; | |
5014 | } | |
5015 | ||
1130e5b3 | 5016 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5017 | |
f9503385 DO |
5018 | /* try to resolve regulators coupling since a new one was registered */ |
5019 | mutex_lock(®ulator_list_mutex); | |
5020 | regulator_resolve_coupling(rdev); | |
5021 | mutex_unlock(®ulator_list_mutex); | |
5022 | ||
5e3ca2b3 JMC |
5023 | /* try to resolve regulators supply since a new one was registered */ |
5024 | class_for_each_device(®ulator_class, NULL, NULL, | |
5025 | regulator_register_resolve_supply); | |
1b3de223 | 5026 | kfree(config); |
414c70cb | 5027 | return rdev; |
4fca9545 | 5028 | |
d4033b54 | 5029 | unset_supplies: |
45389c47 | 5030 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5031 | unset_regulator_supplies(rdev); |
45389c47 | 5032 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5033 | wash: |
469b640e | 5034 | kfree(rdev->constraints); |
45389c47 | 5035 | mutex_lock(®ulator_list_mutex); |
32165230 | 5036 | regulator_ena_gpio_free(rdev); |
45389c47 | 5037 | mutex_unlock(®ulator_list_mutex); |
4fca9545 | 5038 | clean: |
0edb040d LW |
5039 | if (dangling_of_gpiod) |
5040 | gpiod_put(config->ena_gpiod); | |
4fca9545 | 5041 | kfree(rdev); |
a2151374 | 5042 | kfree(config); |
0edb040d LW |
5043 | rinse: |
5044 | if (dangling_cfg_gpiod) | |
5045 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5046 | return ERR_PTR(ret); |
414c70cb LG |
5047 | } |
5048 | EXPORT_SYMBOL_GPL(regulator_register); | |
5049 | ||
5050 | /** | |
5051 | * regulator_unregister - unregister regulator | |
69279fb9 | 5052 | * @rdev: regulator to unregister |
414c70cb LG |
5053 | * |
5054 | * Called by regulator drivers to unregister a regulator. | |
5055 | */ | |
5056 | void regulator_unregister(struct regulator_dev *rdev) | |
5057 | { | |
5058 | if (rdev == NULL) | |
5059 | return; | |
5060 | ||
891636ea MB |
5061 | if (rdev->supply) { |
5062 | while (rdev->use_count--) | |
5063 | regulator_disable(rdev->supply); | |
e032b376 | 5064 | regulator_put(rdev->supply); |
891636ea | 5065 | } |
ff9b34b6 | 5066 | |
414c70cb | 5067 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5068 | |
1130e5b3 | 5069 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 5070 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 5071 | WARN_ON(rdev->open_count); |
6303f3e7 | 5072 | regulator_remove_coupling(rdev); |
0f1d747b | 5073 | unset_regulator_supplies(rdev); |
414c70cb | 5074 | list_del(&rdev->list); |
f19b00da | 5075 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5076 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5077 | |
5078 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5079 | } |
5080 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5081 | ||
f7efad10 | 5082 | #ifdef CONFIG_SUSPEND |
414c70cb | 5083 | /** |
0380cf7d | 5084 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5085 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5086 | * |
5087 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5088 | */ |
0380cf7d | 5089 | static int regulator_suspend(struct device *dev) |
414c70cb | 5090 | { |
cd7e36ab | 5091 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5092 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab MS |
5093 | int ret; |
5094 | ||
5095 | regulator_lock(rdev); | |
5096 | ret = suspend_set_state(rdev, state); | |
5097 | regulator_unlock(rdev); | |
414c70cb | 5098 | |
cd7e36ab | 5099 | return ret; |
85f3b431 | 5100 | } |
d3e4eccb | 5101 | |
cd7e36ab | 5102 | static int regulator_resume(struct device *dev) |
85f3b431 | 5103 | { |
cd7e36ab | 5104 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5105 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5106 | struct regulator_state *rstate; |
cd7e36ab | 5107 | int ret = 0; |
f7efad10 | 5108 | |
cd7e36ab | 5109 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5110 | if (rstate == NULL) |
35b5f14e | 5111 | return 0; |
414c70cb | 5112 | |
66cf9a7e | 5113 | regulator_lock(rdev); |
85f3b431 | 5114 | |
0380cf7d | 5115 | if (rdev->desc->ops->resume && |
f7efad10 CZ |
5116 | (rstate->enabled == ENABLE_IN_SUSPEND || |
5117 | rstate->enabled == DISABLE_IN_SUSPEND)) | |
0380cf7d | 5118 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5119 | |
66cf9a7e | 5120 | regulator_unlock(rdev); |
85f3b431 | 5121 | |
f7efad10 | 5122 | return ret; |
414c70cb | 5123 | } |
f7efad10 CZ |
5124 | #else /* !CONFIG_SUSPEND */ |
5125 | ||
0380cf7d | 5126 | #define regulator_suspend NULL |
5127 | #define regulator_resume NULL | |
f7efad10 CZ |
5128 | |
5129 | #endif /* !CONFIG_SUSPEND */ | |
5130 | ||
5131 | #ifdef CONFIG_PM | |
5132 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5133 | .suspend = regulator_suspend, |
5134 | .resume = regulator_resume, | |
f7efad10 CZ |
5135 | }; |
5136 | #endif | |
5137 | ||
285c22de | 5138 | struct class regulator_class = { |
f7efad10 CZ |
5139 | .name = "regulator", |
5140 | .dev_release = regulator_dev_release, | |
5141 | .dev_groups = regulator_dev_groups, | |
5142 | #ifdef CONFIG_PM | |
5143 | .pm = ®ulator_pm_ops, | |
5144 | #endif | |
5145 | }; | |
ca725561 MB |
5146 | /** |
5147 | * regulator_has_full_constraints - the system has fully specified constraints | |
5148 | * | |
5149 | * Calling this function will cause the regulator API to disable all | |
5150 | * regulators which have a zero use count and don't have an always_on | |
5151 | * constraint in a late_initcall. | |
5152 | * | |
5153 | * The intention is that this will become the default behaviour in a | |
5154 | * future kernel release so users are encouraged to use this facility | |
5155 | * now. | |
5156 | */ | |
5157 | void regulator_has_full_constraints(void) | |
5158 | { | |
5159 | has_full_constraints = 1; | |
5160 | } | |
5161 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5162 | ||
414c70cb LG |
5163 | /** |
5164 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5165 | * @rdev: regulator |
414c70cb LG |
5166 | * |
5167 | * Get rdev regulator driver private data. This call can be used in the | |
5168 | * regulator driver context. | |
5169 | */ | |
5170 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5171 | { | |
5172 | return rdev->reg_data; | |
5173 | } | |
5174 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5175 | ||
5176 | /** | |
5177 | * regulator_get_drvdata - get regulator driver data | |
5178 | * @regulator: regulator | |
5179 | * | |
5180 | * Get regulator driver private data. This call can be used in the consumer | |
5181 | * driver context when non API regulator specific functions need to be called. | |
5182 | */ | |
5183 | void *regulator_get_drvdata(struct regulator *regulator) | |
5184 | { | |
5185 | return regulator->rdev->reg_data; | |
5186 | } | |
5187 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5188 | ||
5189 | /** | |
5190 | * regulator_set_drvdata - set regulator driver data | |
5191 | * @regulator: regulator | |
5192 | * @data: data | |
5193 | */ | |
5194 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5195 | { | |
5196 | regulator->rdev->reg_data = data; | |
5197 | } | |
5198 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5199 | ||
5200 | /** | |
5201 | * regulator_get_id - get regulator ID | |
69279fb9 | 5202 | * @rdev: regulator |
414c70cb LG |
5203 | */ |
5204 | int rdev_get_id(struct regulator_dev *rdev) | |
5205 | { | |
5206 | return rdev->desc->id; | |
5207 | } | |
5208 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5209 | ||
a5766f11 LG |
5210 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5211 | { | |
5212 | return &rdev->dev; | |
5213 | } | |
5214 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5215 | ||
03c87b95 BG |
5216 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5217 | { | |
5218 | return rdev->regmap; | |
5219 | } | |
5220 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5221 | ||
a5766f11 LG |
5222 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5223 | { | |
5224 | return reg_init_data->driver_data; | |
5225 | } | |
5226 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5227 | ||
ba55a974 | 5228 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5229 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5230 | { |
ba55a974 MB |
5231 | struct regulator_map *map; |
5232 | ||
ba55a974 | 5233 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5234 | seq_printf(sf, "%s -> %s.%s\n", |
5235 | rdev_get_name(map->regulator), map->dev_name, | |
5236 | map->supply); | |
ba55a974 MB |
5237 | } |
5238 | ||
dbc55955 HZ |
5239 | return 0; |
5240 | } | |
3e60b4fc | 5241 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5242 | |
85f3b431 TV |
5243 | struct summary_data { |
5244 | struct seq_file *s; | |
5245 | struct regulator_dev *parent; | |
5246 | int level; | |
5247 | }; | |
5248 | ||
5249 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5250 | struct regulator_dev *rdev, | |
5251 | int level); | |
5252 | ||
5253 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5254 | { | |
5255 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5256 | struct summary_data *summary_data = data; | |
5257 | ||
5258 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5259 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5260 | summary_data->level + 1); | |
5261 | ||
5262 | return 0; | |
5263 | } | |
5264 | ||
7c225ec9 HS |
5265 | static void regulator_summary_show_subtree(struct seq_file *s, |
5266 | struct regulator_dev *rdev, | |
5267 | int level) | |
5268 | { | |
7c225ec9 HS |
5269 | struct regulation_constraints *c; |
5270 | struct regulator *consumer; | |
85f3b431 | 5271 | struct summary_data summary_data; |
7e4d9683 | 5272 | unsigned int opmode; |
7c225ec9 HS |
5273 | |
5274 | if (!rdev) | |
5275 | return; | |
5276 | ||
7e4d9683 | 5277 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5278 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5279 | level * 3 + 1, "", |
5280 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5281 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5282 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5283 | |
23296099 | 5284 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
7e4d9683 DA |
5285 | seq_printf(s, "%5dmA ", |
5286 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5287 | |
5288 | c = rdev->constraints; | |
5289 | if (c) { | |
5290 | switch (rdev->desc->type) { | |
5291 | case REGULATOR_VOLTAGE: | |
5292 | seq_printf(s, "%5dmV %5dmV ", | |
5293 | c->min_uV / 1000, c->max_uV / 1000); | |
5294 | break; | |
5295 | case REGULATOR_CURRENT: | |
5296 | seq_printf(s, "%5dmA %5dmA ", | |
5297 | c->min_uA / 1000, c->max_uA / 1000); | |
5298 | break; | |
5299 | } | |
5300 | } | |
5301 | ||
5302 | seq_puts(s, "\n"); | |
5303 | ||
5304 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5305 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5306 | continue; |
5307 | ||
5308 | seq_printf(s, "%*s%-*s ", | |
5309 | (level + 1) * 3 + 1, "", | |
e42a46b6 LC |
5310 | 30 - (level + 1) * 3, |
5311 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); | |
7c225ec9 HS |
5312 | |
5313 | switch (rdev->desc->type) { | |
5314 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5315 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5316 | consumer->enable_count, | |
7d3827b5 | 5317 | consumer->uA_load / 1000, |
5451781d DA |
5318 | consumer->uA_load && !consumer->enable_count ? |
5319 | '*' : ' ', | |
c360a6df CZ |
5320 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5321 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5322 | break; |
5323 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5324 | break; |
5325 | } | |
5326 | ||
5327 | seq_puts(s, "\n"); | |
5328 | } | |
5329 | ||
85f3b431 TV |
5330 | summary_data.s = s; |
5331 | summary_data.level = level; | |
5332 | summary_data.parent = rdev; | |
7c225ec9 | 5333 | |
85f3b431 TV |
5334 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5335 | regulator_summary_show_children); | |
f8702f9e DO |
5336 | } |
5337 | ||
5338 | struct summary_lock_data { | |
5339 | struct ww_acquire_ctx *ww_ctx; | |
5340 | struct regulator_dev **new_contended_rdev; | |
5341 | struct regulator_dev **old_contended_rdev; | |
5342 | }; | |
5343 | ||
5344 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5345 | { | |
5346 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5347 | struct summary_lock_data *lock_data = data; | |
5348 | int ret = 0; | |
5349 | ||
5350 | if (rdev != *lock_data->old_contended_rdev) { | |
5351 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5352 | ||
5353 | if (ret == -EDEADLK) | |
5354 | *lock_data->new_contended_rdev = rdev; | |
5355 | else | |
5356 | WARN_ON_ONCE(ret); | |
5357 | } else { | |
5358 | *lock_data->old_contended_rdev = NULL; | |
5359 | } | |
5360 | ||
5361 | return ret; | |
5362 | } | |
5363 | ||
5364 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5365 | { | |
5366 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5367 | struct summary_lock_data *lock_data = data; | |
5368 | ||
5369 | if (lock_data) { | |
5370 | if (rdev == *lock_data->new_contended_rdev) | |
5371 | return -EDEADLK; | |
5372 | } | |
7e4d9683 DA |
5373 | |
5374 | regulator_unlock(rdev); | |
f8702f9e DO |
5375 | |
5376 | return 0; | |
5377 | } | |
5378 | ||
5379 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5380 | struct regulator_dev **new_contended_rdev, | |
5381 | struct regulator_dev **old_contended_rdev) | |
5382 | { | |
5383 | struct summary_lock_data lock_data; | |
5384 | int ret; | |
5385 | ||
5386 | lock_data.ww_ctx = ww_ctx; | |
5387 | lock_data.new_contended_rdev = new_contended_rdev; | |
5388 | lock_data.old_contended_rdev = old_contended_rdev; | |
5389 | ||
5390 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5391 | regulator_summary_lock_one); | |
5392 | if (ret) | |
5393 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5394 | regulator_summary_unlock_one); | |
5395 | ||
5396 | return ret; | |
5397 | } | |
5398 | ||
5399 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5400 | { | |
5401 | struct regulator_dev *new_contended_rdev = NULL; | |
5402 | struct regulator_dev *old_contended_rdev = NULL; | |
5403 | int err; | |
5404 | ||
ff9b34b6 DO |
5405 | mutex_lock(®ulator_list_mutex); |
5406 | ||
f8702f9e DO |
5407 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5408 | ||
5409 | do { | |
5410 | if (new_contended_rdev) { | |
5411 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5412 | old_contended_rdev = new_contended_rdev; | |
5413 | old_contended_rdev->ref_cnt++; | |
5414 | } | |
5415 | ||
5416 | err = regulator_summary_lock_all(ww_ctx, | |
5417 | &new_contended_rdev, | |
5418 | &old_contended_rdev); | |
5419 | ||
5420 | if (old_contended_rdev) | |
5421 | regulator_unlock(old_contended_rdev); | |
5422 | ||
5423 | } while (err == -EDEADLK); | |
5424 | ||
5425 | ww_acquire_done(ww_ctx); | |
5426 | } | |
5427 | ||
5428 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5429 | { | |
5430 | class_for_each_device(®ulator_class, NULL, NULL, | |
5431 | regulator_summary_unlock_one); | |
5432 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5433 | |
5434 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5435 | } |
5436 | ||
85f3b431 | 5437 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5438 | { |
85f3b431 TV |
5439 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5440 | struct seq_file *s = data; | |
7c225ec9 | 5441 | |
85f3b431 TV |
5442 | if (!rdev->supply) |
5443 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5444 | |
85f3b431 TV |
5445 | return 0; |
5446 | } | |
7c225ec9 | 5447 | |
85f3b431 TV |
5448 | static int regulator_summary_show(struct seq_file *s, void *data) |
5449 | { | |
f8702f9e DO |
5450 | struct ww_acquire_ctx ww_ctx; |
5451 | ||
01de19d0 DA |
5452 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5453 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5454 | |
f8702f9e DO |
5455 | regulator_summary_lock(&ww_ctx); |
5456 | ||
85f3b431 TV |
5457 | class_for_each_device(®ulator_class, NULL, s, |
5458 | regulator_summary_show_roots); | |
7c225ec9 | 5459 | |
f8702f9e DO |
5460 | regulator_summary_unlock(&ww_ctx); |
5461 | ||
7c225ec9 HS |
5462 | return 0; |
5463 | } | |
3e60b4fc YL |
5464 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5465 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5466 | |
414c70cb LG |
5467 | static int __init regulator_init(void) |
5468 | { | |
34abbd68 MB |
5469 | int ret; |
5470 | ||
34abbd68 MB |
5471 | ret = class_register(®ulator_class); |
5472 | ||
1130e5b3 | 5473 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5474 | if (!debugfs_root) |
1130e5b3 | 5475 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5476 | |
3e60b4fc | 5477 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5478 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5479 | &supply_map_fops); | |
1130e5b3 | 5480 | |
7c225ec9 | 5481 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5482 | NULL, ®ulator_summary_fops); |
3e60b4fc | 5483 | #endif |
34abbd68 MB |
5484 | regulator_dummy_init(); |
5485 | ||
5486 | return ret; | |
414c70cb LG |
5487 | } |
5488 | ||
5489 | /* init early to allow our consumers to complete system booting */ | |
5490 | core_initcall(regulator_init); | |
ca725561 | 5491 | |
609ca5f3 | 5492 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5493 | { |
609ca5f3 MB |
5494 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5495 | const struct regulator_ops *ops = rdev->desc->ops; | |
5496 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5497 | int enabled, ret; |
ca725561 | 5498 | |
609ca5f3 MB |
5499 | if (c && c->always_on) |
5500 | return 0; | |
5501 | ||
8a34e979 | 5502 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5503 | return 0; |
5504 | ||
66cf9a7e | 5505 | regulator_lock(rdev); |
609ca5f3 MB |
5506 | |
5507 | if (rdev->use_count) | |
5508 | goto unlock; | |
5509 | ||
5510 | /* If we can't read the status assume it's on. */ | |
5511 | if (ops->is_enabled) | |
5512 | enabled = ops->is_enabled(rdev); | |
5513 | else | |
5514 | enabled = 1; | |
5515 | ||
5516 | if (!enabled) | |
5517 | goto unlock; | |
5518 | ||
5519 | if (have_full_constraints()) { | |
5520 | /* We log since this may kill the system if it goes | |
5521 | * wrong. */ | |
5522 | rdev_info(rdev, "disabling\n"); | |
5523 | ret = _regulator_do_disable(rdev); | |
5524 | if (ret != 0) | |
5525 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
5526 | } else { | |
5527 | /* The intention is that in future we will | |
5528 | * assume that full constraints are provided | |
5529 | * so warn even if we aren't going to do | |
5530 | * anything here. | |
5531 | */ | |
5532 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5533 | } | |
5534 | ||
5535 | unlock: | |
66cf9a7e | 5536 | regulator_unlock(rdev); |
609ca5f3 MB |
5537 | |
5538 | return 0; | |
5539 | } | |
5540 | ||
5541 | static int __init regulator_init_complete(void) | |
5542 | { | |
86f5fcfc MB |
5543 | /* |
5544 | * Since DT doesn't provide an idiomatic mechanism for | |
5545 | * enabling full constraints and since it's much more natural | |
5546 | * with DT to provide them just assume that a DT enabled | |
5547 | * system has full constraints. | |
5548 | */ | |
5549 | if (of_have_populated_dt()) | |
5550 | has_full_constraints = true; | |
5551 | ||
3827b64d JMC |
5552 | /* |
5553 | * Regulators may had failed to resolve their input supplies | |
5554 | * when were registered, either because the input supply was | |
5555 | * not registered yet or because its parent device was not | |
5556 | * bound yet. So attempt to resolve the input supplies for | |
5557 | * pending regulators before trying to disable unused ones. | |
5558 | */ | |
5559 | class_for_each_device(®ulator_class, NULL, NULL, | |
5560 | regulator_register_resolve_supply); | |
5561 | ||
ca725561 | 5562 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5563 | * we have permission to change the status for and which are |
5564 | * not in use or always_on. This is effectively the default | |
5565 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5566 | */ |
609ca5f3 MB |
5567 | class_for_each_device(®ulator_class, NULL, NULL, |
5568 | regulator_late_cleanup); | |
ca725561 MB |
5569 | |
5570 | return 0; | |
5571 | } | |
fd482a3e | 5572 | late_initcall_sync(regulator_init_complete); |