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> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
f8702f9e DO |
53 | static DEFINE_WW_CLASS(regulator_ww_class); |
54 | static DEFINE_MUTEX(regulator_nesting_mutex); | |
414c70cb | 55 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 56 | static LIST_HEAD(regulator_map_list); |
f19b00da | 57 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 58 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 59 | static bool has_full_constraints; |
414c70cb | 60 | |
1130e5b3 | 61 | static struct dentry *debugfs_root; |
1130e5b3 | 62 | |
8dc5390d | 63 | /* |
414c70cb LG |
64 | * struct regulator_map |
65 | * | |
66 | * Used to provide symbolic supply names to devices. | |
67 | */ | |
68 | struct regulator_map { | |
69 | struct list_head list; | |
40f9244f | 70 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 71 | const char *supply; |
a5766f11 | 72 | struct regulator_dev *regulator; |
414c70cb LG |
73 | }; |
74 | ||
f19b00da KM |
75 | /* |
76 | * struct regulator_enable_gpio | |
77 | * | |
78 | * Management for shared enable GPIO pin | |
79 | */ | |
80 | struct regulator_enable_gpio { | |
81 | struct list_head list; | |
778b28b4 | 82 | struct gpio_desc *gpiod; |
f19b00da KM |
83 | u32 enable_count; /* a number of enabled shared GPIO */ |
84 | u32 request_count; /* a number of requested shared GPIO */ | |
85 | unsigned int ena_gpio_invert:1; | |
86 | }; | |
87 | ||
a06ccd9c CK |
88 | /* |
89 | * struct regulator_supply_alias | |
90 | * | |
91 | * Used to map lookups for a supply onto an alternative device. | |
92 | */ | |
93 | struct regulator_supply_alias { | |
94 | struct list_head list; | |
95 | struct device *src_dev; | |
96 | const char *src_supply; | |
97 | struct device *alias_dev; | |
98 | const char *alias_supply; | |
99 | }; | |
100 | ||
414c70cb | 101 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
5451781d | 102 | static int _regulator_disable(struct regulator *regulator); |
414c70cb LG |
103 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
104 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
105 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 106 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 107 | unsigned long event, void *data); |
75790251 MB |
108 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
109 | int min_uV, int max_uV); | |
c054c6c7 MP |
110 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
111 | suspend_state_t state); | |
9243a195 MP |
112 | static int regulator_set_voltage_rdev(struct regulator_dev *rdev, |
113 | int min_uV, int max_uV, | |
114 | suspend_state_t state); | |
3801b86a MB |
115 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
116 | struct device *dev, | |
117 | const char *supply_name); | |
36a1f1b6 | 118 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 119 | |
1083c393 MB |
120 | static const char *rdev_get_name(struct regulator_dev *rdev) |
121 | { | |
122 | if (rdev->constraints && rdev->constraints->name) | |
123 | return rdev->constraints->name; | |
124 | else if (rdev->desc->name) | |
125 | return rdev->desc->name; | |
126 | else | |
127 | return ""; | |
128 | } | |
129 | ||
87b28417 MB |
130 | static bool have_full_constraints(void) |
131 | { | |
75bc9641 | 132 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
133 | } |
134 | ||
8a34e979 WP |
135 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
136 | { | |
137 | if (!rdev->constraints) { | |
138 | rdev_err(rdev, "no constraints\n"); | |
139 | return false; | |
140 | } | |
141 | ||
142 | if (rdev->constraints->valid_ops_mask & ops) | |
143 | return true; | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
70a7fb80 TR |
148 | static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev) |
149 | { | |
150 | if (rdev && rdev->supply) | |
151 | return rdev->supply->rdev; | |
152 | ||
153 | return NULL; | |
154 | } | |
155 | ||
66cf9a7e MP |
156 | /** |
157 | * regulator_lock_nested - lock a single regulator | |
158 | * @rdev: regulator source | |
f8702f9e | 159 | * @ww_ctx: w/w mutex acquire context |
66cf9a7e MP |
160 | * |
161 | * This function can be called many times by one task on | |
162 | * a single regulator and its mutex will be locked only | |
163 | * once. If a task, which is calling this function is other | |
164 | * than the one, which initially locked the mutex, it will | |
165 | * wait on mutex. | |
166 | */ | |
f8702f9e DO |
167 | static inline int regulator_lock_nested(struct regulator_dev *rdev, |
168 | struct ww_acquire_ctx *ww_ctx) | |
66cf9a7e | 169 | { |
f8702f9e DO |
170 | bool lock = false; |
171 | int ret = 0; | |
172 | ||
173 | mutex_lock(®ulator_nesting_mutex); | |
174 | ||
175 | if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) { | |
176 | if (rdev->mutex_owner == current) | |
66cf9a7e | 177 | rdev->ref_cnt++; |
f8702f9e DO |
178 | else |
179 | lock = true; | |
180 | ||
181 | if (lock) { | |
182 | mutex_unlock(®ulator_nesting_mutex); | |
183 | ret = ww_mutex_lock(&rdev->mutex, ww_ctx); | |
184 | mutex_lock(®ulator_nesting_mutex); | |
66cf9a7e | 185 | } |
f8702f9e DO |
186 | } else { |
187 | lock = true; | |
66cf9a7e MP |
188 | } |
189 | ||
f8702f9e DO |
190 | if (lock && ret != -EDEADLK) { |
191 | rdev->ref_cnt++; | |
192 | rdev->mutex_owner = current; | |
193 | } | |
194 | ||
195 | mutex_unlock(®ulator_nesting_mutex); | |
196 | ||
197 | return ret; | |
66cf9a7e MP |
198 | } |
199 | ||
f8702f9e DO |
200 | /** |
201 | * regulator_lock - lock a single regulator | |
202 | * @rdev: regulator source | |
203 | * | |
204 | * This function can be called many times by one task on | |
205 | * a single regulator and its mutex will be locked only | |
206 | * once. If a task, which is calling this function is other | |
207 | * than the one, which initially locked the mutex, it will | |
208 | * wait on mutex. | |
209 | */ | |
210 | void regulator_lock(struct regulator_dev *rdev) | |
66cf9a7e | 211 | { |
f8702f9e | 212 | regulator_lock_nested(rdev, NULL); |
66cf9a7e MP |
213 | } |
214 | ||
215 | /** | |
216 | * regulator_unlock - unlock a single regulator | |
217 | * @rdev: regulator_source | |
218 | * | |
219 | * This function unlocks the mutex when the | |
220 | * reference counter reaches 0. | |
221 | */ | |
f8702f9e | 222 | void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 223 | { |
f8702f9e | 224 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 225 | |
f8702f9e DO |
226 | if (--rdev->ref_cnt == 0) { |
227 | rdev->mutex_owner = NULL; | |
228 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 229 | } |
f8702f9e DO |
230 | |
231 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
232 | ||
233 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e MP |
234 | } |
235 | ||
089e2cc2 | 236 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 237 | { |
089e2cc2 DO |
238 | struct regulator_dev *c_rdev; |
239 | int i; | |
240 | ||
241 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
242 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 243 | |
089e2cc2 DO |
244 | if (rdev->supply->rdev == c_rdev) |
245 | return true; | |
246 | } | |
247 | ||
248 | return false; | |
249 | } | |
250 | ||
f8702f9e DO |
251 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
252 | unsigned int n_coupled) | |
9f01cd4a | 253 | { |
9243a195 | 254 | struct regulator_dev *c_rdev; |
fa731ac7 | 255 | int i; |
9f01cd4a | 256 | |
f8702f9e DO |
257 | for (i = n_coupled; i > 0; i--) { |
258 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
259 | |
260 | if (!c_rdev) | |
261 | continue; | |
262 | ||
089e2cc2 | 263 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) |
f8702f9e DO |
264 | regulator_unlock_recursive( |
265 | c_rdev->supply->rdev, | |
266 | c_rdev->coupling_desc.n_coupled); | |
9243a195 | 267 | |
f8702f9e DO |
268 | regulator_unlock(c_rdev); |
269 | } | |
9f01cd4a SH |
270 | } |
271 | ||
f8702f9e DO |
272 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
273 | struct regulator_dev **new_contended_rdev, | |
274 | struct regulator_dev **old_contended_rdev, | |
275 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 276 | { |
9243a195 | 277 | struct regulator_dev *c_rdev; |
f8702f9e | 278 | int i, err; |
9f01cd4a | 279 | |
9243a195 MP |
280 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
281 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 282 | |
9243a195 MP |
283 | if (!c_rdev) |
284 | continue; | |
9f01cd4a | 285 | |
f8702f9e DO |
286 | if (c_rdev != *old_contended_rdev) { |
287 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
288 | if (err) { | |
289 | if (err == -EDEADLK) { | |
290 | *new_contended_rdev = c_rdev; | |
291 | goto err_unlock; | |
292 | } | |
9243a195 | 293 | |
f8702f9e DO |
294 | /* shouldn't happen */ |
295 | WARN_ON_ONCE(err != -EALREADY); | |
296 | } | |
297 | } else { | |
298 | *old_contended_rdev = NULL; | |
299 | } | |
300 | ||
089e2cc2 | 301 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
302 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
303 | new_contended_rdev, | |
304 | old_contended_rdev, | |
305 | ww_ctx); | |
306 | if (err) { | |
307 | regulator_unlock(c_rdev); | |
308 | goto err_unlock; | |
309 | } | |
66cf9a7e MP |
310 | } |
311 | } | |
f8702f9e DO |
312 | |
313 | return 0; | |
314 | ||
315 | err_unlock: | |
316 | regulator_unlock_recursive(rdev, i); | |
317 | ||
318 | return err; | |
66cf9a7e MP |
319 | } |
320 | ||
38de19fa | 321 | /** |
f8702f9e DO |
322 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
323 | * regulators | |
324 | * @rdev: regulator source | |
325 | * @ww_ctx: w/w mutex acquire context | |
326 | * | |
327 | * Unlock all regulators related with rdev by coupling or suppling. | |
38de19fa | 328 | */ |
f8702f9e DO |
329 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
330 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 331 | { |
f8702f9e DO |
332 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
333 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
334 | } |
335 | ||
336 | /** | |
9243a195 MP |
337 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
338 | * @rdev: regulator source | |
f8702f9e | 339 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
340 | * |
341 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
342 | * all regulators related with rdev by coupling or suppling. | |
9f01cd4a | 343 | */ |
f8702f9e DO |
344 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
345 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 346 | { |
f8702f9e DO |
347 | struct regulator_dev *new_contended_rdev = NULL; |
348 | struct regulator_dev *old_contended_rdev = NULL; | |
349 | int err; | |
9f01cd4a | 350 | |
f8702f9e | 351 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 352 | |
f8702f9e | 353 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 354 | |
f8702f9e DO |
355 | do { |
356 | if (new_contended_rdev) { | |
357 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
358 | old_contended_rdev = new_contended_rdev; | |
359 | old_contended_rdev->ref_cnt++; | |
360 | } | |
361 | ||
362 | err = regulator_lock_recursive(rdev, | |
363 | &new_contended_rdev, | |
364 | &old_contended_rdev, | |
365 | ww_ctx); | |
366 | ||
367 | if (old_contended_rdev) | |
368 | regulator_unlock(old_contended_rdev); | |
369 | ||
370 | } while (err == -EDEADLK); | |
371 | ||
372 | ww_acquire_done(ww_ctx); | |
373 | ||
374 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
375 | } |
376 | ||
fe06051d | 377 | /** |
378 | * of_get_child_regulator - get a child regulator device node | |
379 | * based on supply name | |
380 | * @parent: Parent device node | |
381 | * @prop_name: Combination regulator supply name and "-supply" | |
382 | * | |
383 | * Traverse all child nodes. | |
384 | * Extract the child regulator device node corresponding to the supply name. | |
385 | * returns the device node corresponding to the regulator if found, else | |
386 | * returns NULL. | |
387 | */ | |
388 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
389 | const char *prop_name) | |
390 | { | |
391 | struct device_node *regnode = NULL; | |
392 | struct device_node *child = NULL; | |
393 | ||
394 | for_each_child_of_node(parent, child) { | |
395 | regnode = of_parse_phandle(child, prop_name, 0); | |
396 | ||
397 | if (!regnode) { | |
398 | regnode = of_get_child_regulator(child, prop_name); | |
399 | if (regnode) | |
400 | return regnode; | |
401 | } else { | |
402 | return regnode; | |
403 | } | |
404 | } | |
405 | return NULL; | |
406 | } | |
407 | ||
69511a45 RN |
408 | /** |
409 | * of_get_regulator - get a regulator device node based on supply name | |
410 | * @dev: Device pointer for the consumer (of regulator) device | |
411 | * @supply: regulator supply name | |
412 | * | |
413 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 414 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
415 | * returns NULL. |
416 | */ | |
417 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
418 | { | |
419 | struct device_node *regnode = NULL; | |
420 | char prop_name[32]; /* 32 is max size of property name */ | |
421 | ||
422 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
423 | ||
424 | snprintf(prop_name, 32, "%s-supply", supply); | |
425 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
426 | ||
427 | if (!regnode) { | |
fe06051d | 428 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
429 | if (regnode) | |
430 | return regnode; | |
431 | ||
7799167b RH |
432 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
433 | prop_name, dev->of_node); | |
69511a45 RN |
434 | return NULL; |
435 | } | |
436 | return regnode; | |
437 | } | |
438 | ||
414c70cb LG |
439 | /* Platform voltage constraint check */ |
440 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
441 | int *min_uV, int *max_uV) | |
442 | { | |
443 | BUG_ON(*min_uV > *max_uV); | |
444 | ||
8a34e979 | 445 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 446 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
447 | return -EPERM; |
448 | } | |
449 | ||
450 | if (*max_uV > rdev->constraints->max_uV) | |
451 | *max_uV = rdev->constraints->max_uV; | |
452 | if (*min_uV < rdev->constraints->min_uV) | |
453 | *min_uV = rdev->constraints->min_uV; | |
454 | ||
89f425ed MB |
455 | if (*min_uV > *max_uV) { |
456 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 457 | *min_uV, *max_uV); |
414c70cb | 458 | return -EINVAL; |
89f425ed | 459 | } |
414c70cb LG |
460 | |
461 | return 0; | |
462 | } | |
463 | ||
f7efad10 CZ |
464 | /* return 0 if the state is valid */ |
465 | static int regulator_check_states(suspend_state_t state) | |
466 | { | |
467 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
468 | } | |
469 | ||
05fda3b1 TP |
470 | /* Make sure we select a voltage that suits the needs of all |
471 | * regulator consumers | |
472 | */ | |
473 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
c360a6df CZ |
474 | int *min_uV, int *max_uV, |
475 | suspend_state_t state) | |
05fda3b1 TP |
476 | { |
477 | struct regulator *regulator; | |
c360a6df | 478 | struct regulator_voltage *voltage; |
05fda3b1 TP |
479 | |
480 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 481 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
482 | /* |
483 | * Assume consumers that didn't say anything are OK | |
484 | * with anything in the constraint range. | |
485 | */ | |
c360a6df | 486 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
487 | continue; |
488 | ||
c360a6df CZ |
489 | if (*max_uV > voltage->max_uV) |
490 | *max_uV = voltage->max_uV; | |
491 | if (*min_uV < voltage->min_uV) | |
492 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
493 | } |
494 | ||
dd8004af | 495 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
496 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
497 | *min_uV, *max_uV); | |
05fda3b1 | 498 | return -EINVAL; |
dd8004af | 499 | } |
05fda3b1 TP |
500 | |
501 | return 0; | |
502 | } | |
503 | ||
414c70cb LG |
504 | /* current constraint check */ |
505 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
506 | int *min_uA, int *max_uA) | |
507 | { | |
508 | BUG_ON(*min_uA > *max_uA); | |
509 | ||
8a34e979 | 510 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 511 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
512 | return -EPERM; |
513 | } | |
514 | ||
515 | if (*max_uA > rdev->constraints->max_uA) | |
516 | *max_uA = rdev->constraints->max_uA; | |
517 | if (*min_uA < rdev->constraints->min_uA) | |
518 | *min_uA = rdev->constraints->min_uA; | |
519 | ||
89f425ed MB |
520 | if (*min_uA > *max_uA) { |
521 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 522 | *min_uA, *max_uA); |
414c70cb | 523 | return -EINVAL; |
89f425ed | 524 | } |
414c70cb LG |
525 | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /* operating mode constraint check */ | |
109c75af CK |
530 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
531 | unsigned int *mode) | |
414c70cb | 532 | { |
2c608234 | 533 | switch (*mode) { |
e573520b DB |
534 | case REGULATOR_MODE_FAST: |
535 | case REGULATOR_MODE_NORMAL: | |
536 | case REGULATOR_MODE_IDLE: | |
537 | case REGULATOR_MODE_STANDBY: | |
538 | break; | |
539 | default: | |
89f425ed | 540 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
541 | return -EINVAL; |
542 | } | |
543 | ||
8a34e979 | 544 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 545 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
546 | return -EPERM; |
547 | } | |
2c608234 MB |
548 | |
549 | /* The modes are bitmasks, the most power hungry modes having | |
550 | * the lowest values. If the requested mode isn't supported | |
551 | * try higher modes. */ | |
552 | while (*mode) { | |
553 | if (rdev->constraints->valid_modes_mask & *mode) | |
554 | return 0; | |
555 | *mode /= 2; | |
414c70cb | 556 | } |
2c608234 MB |
557 | |
558 | return -EINVAL; | |
414c70cb LG |
559 | } |
560 | ||
f7efad10 CZ |
561 | static inline struct regulator_state * |
562 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
563 | { | |
564 | if (rdev->constraints == NULL) | |
565 | return NULL; | |
566 | ||
567 | switch (state) { | |
568 | case PM_SUSPEND_STANDBY: | |
569 | return &rdev->constraints->state_standby; | |
570 | case PM_SUSPEND_MEM: | |
571 | return &rdev->constraints->state_mem; | |
572 | case PM_SUSPEND_MAX: | |
573 | return &rdev->constraints->state_disk; | |
574 | default: | |
575 | return NULL; | |
576 | } | |
577 | } | |
578 | ||
414c70cb LG |
579 | static ssize_t regulator_uV_show(struct device *dev, |
580 | struct device_attribute *attr, char *buf) | |
581 | { | |
a5766f11 | 582 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
583 | ssize_t ret; |
584 | ||
66cf9a7e | 585 | regulator_lock(rdev); |
414c70cb | 586 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); |
66cf9a7e | 587 | regulator_unlock(rdev); |
414c70cb LG |
588 | |
589 | return ret; | |
590 | } | |
7ad68e2f | 591 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
592 | |
593 | static ssize_t regulator_uA_show(struct device *dev, | |
594 | struct device_attribute *attr, char *buf) | |
595 | { | |
a5766f11 | 596 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
597 | |
598 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
599 | } | |
7ad68e2f | 600 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 601 | |
587cea27 GKH |
602 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
603 | char *buf) | |
bc558a60 MB |
604 | { |
605 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 606 | |
1083c393 | 607 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 608 | } |
587cea27 | 609 | static DEVICE_ATTR_RO(name); |
bc558a60 | 610 | |
01de19d0 | 611 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 612 | { |
414c70cb LG |
613 | switch (mode) { |
614 | case REGULATOR_MODE_FAST: | |
01de19d0 | 615 | return "fast"; |
414c70cb | 616 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 617 | return "normal"; |
414c70cb | 618 | case REGULATOR_MODE_IDLE: |
01de19d0 | 619 | return "idle"; |
414c70cb | 620 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 621 | return "standby"; |
414c70cb | 622 | } |
01de19d0 DA |
623 | return "unknown"; |
624 | } | |
625 | ||
626 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
627 | { | |
628 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
629 | } |
630 | ||
4fca9545 DB |
631 | static ssize_t regulator_opmode_show(struct device *dev, |
632 | struct device_attribute *attr, char *buf) | |
414c70cb | 633 | { |
a5766f11 | 634 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 635 | |
4fca9545 DB |
636 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
637 | } | |
7ad68e2f | 638 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
639 | |
640 | static ssize_t regulator_print_state(char *buf, int state) | |
641 | { | |
414c70cb LG |
642 | if (state > 0) |
643 | return sprintf(buf, "enabled\n"); | |
644 | else if (state == 0) | |
645 | return sprintf(buf, "disabled\n"); | |
646 | else | |
647 | return sprintf(buf, "unknown\n"); | |
648 | } | |
649 | ||
4fca9545 DB |
650 | static ssize_t regulator_state_show(struct device *dev, |
651 | struct device_attribute *attr, char *buf) | |
652 | { | |
653 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
654 | ssize_t ret; |
655 | ||
66cf9a7e | 656 | regulator_lock(rdev); |
9332546f | 657 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 658 | regulator_unlock(rdev); |
4fca9545 | 659 | |
9332546f | 660 | return ret; |
4fca9545 | 661 | } |
7ad68e2f | 662 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 663 | |
853116a1 DB |
664 | static ssize_t regulator_status_show(struct device *dev, |
665 | struct device_attribute *attr, char *buf) | |
666 | { | |
667 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
668 | int status; | |
669 | char *label; | |
670 | ||
671 | status = rdev->desc->ops->get_status(rdev); | |
672 | if (status < 0) | |
673 | return status; | |
674 | ||
675 | switch (status) { | |
676 | case REGULATOR_STATUS_OFF: | |
677 | label = "off"; | |
678 | break; | |
679 | case REGULATOR_STATUS_ON: | |
680 | label = "on"; | |
681 | break; | |
682 | case REGULATOR_STATUS_ERROR: | |
683 | label = "error"; | |
684 | break; | |
685 | case REGULATOR_STATUS_FAST: | |
686 | label = "fast"; | |
687 | break; | |
688 | case REGULATOR_STATUS_NORMAL: | |
689 | label = "normal"; | |
690 | break; | |
691 | case REGULATOR_STATUS_IDLE: | |
692 | label = "idle"; | |
693 | break; | |
694 | case REGULATOR_STATUS_STANDBY: | |
695 | label = "standby"; | |
696 | break; | |
f59c8f9f MB |
697 | case REGULATOR_STATUS_BYPASS: |
698 | label = "bypass"; | |
699 | break; | |
1beaf762 KG |
700 | case REGULATOR_STATUS_UNDEFINED: |
701 | label = "undefined"; | |
702 | break; | |
853116a1 DB |
703 | default: |
704 | return -ERANGE; | |
705 | } | |
706 | ||
707 | return sprintf(buf, "%s\n", label); | |
708 | } | |
709 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
710 | ||
414c70cb LG |
711 | static ssize_t regulator_min_uA_show(struct device *dev, |
712 | struct device_attribute *attr, char *buf) | |
713 | { | |
a5766f11 | 714 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
715 | |
716 | if (!rdev->constraints) | |
717 | return sprintf(buf, "constraint not defined\n"); | |
718 | ||
719 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
720 | } | |
7ad68e2f | 721 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
722 | |
723 | static ssize_t regulator_max_uA_show(struct device *dev, | |
724 | struct device_attribute *attr, char *buf) | |
725 | { | |
a5766f11 | 726 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
727 | |
728 | if (!rdev->constraints) | |
729 | return sprintf(buf, "constraint not defined\n"); | |
730 | ||
731 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
732 | } | |
7ad68e2f | 733 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
734 | |
735 | static ssize_t regulator_min_uV_show(struct device *dev, | |
736 | struct device_attribute *attr, char *buf) | |
737 | { | |
a5766f11 | 738 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
739 | |
740 | if (!rdev->constraints) | |
741 | return sprintf(buf, "constraint not defined\n"); | |
742 | ||
743 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
744 | } | |
7ad68e2f | 745 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
746 | |
747 | static ssize_t regulator_max_uV_show(struct device *dev, | |
748 | struct device_attribute *attr, char *buf) | |
749 | { | |
a5766f11 | 750 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
751 | |
752 | if (!rdev->constraints) | |
753 | return sprintf(buf, "constraint not defined\n"); | |
754 | ||
755 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
756 | } | |
7ad68e2f | 757 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
758 | |
759 | static ssize_t regulator_total_uA_show(struct device *dev, | |
760 | struct device_attribute *attr, char *buf) | |
761 | { | |
a5766f11 | 762 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
763 | struct regulator *regulator; |
764 | int uA = 0; | |
765 | ||
66cf9a7e | 766 | regulator_lock(rdev); |
5451781d DA |
767 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
768 | if (regulator->enable_count) | |
769 | uA += regulator->uA_load; | |
770 | } | |
66cf9a7e | 771 | regulator_unlock(rdev); |
414c70cb LG |
772 | return sprintf(buf, "%d\n", uA); |
773 | } | |
7ad68e2f | 774 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 775 | |
587cea27 GKH |
776 | static ssize_t num_users_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 | return sprintf(buf, "%d\n", rdev->use_count); |
781 | } | |
587cea27 | 782 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 783 | |
587cea27 GKH |
784 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
785 | char *buf) | |
414c70cb | 786 | { |
a5766f11 | 787 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
788 | |
789 | switch (rdev->desc->type) { | |
790 | case REGULATOR_VOLTAGE: | |
791 | return sprintf(buf, "voltage\n"); | |
792 | case REGULATOR_CURRENT: | |
793 | return sprintf(buf, "current\n"); | |
794 | } | |
795 | return sprintf(buf, "unknown\n"); | |
796 | } | |
587cea27 | 797 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
798 | |
799 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
800 | struct device_attribute *attr, char *buf) | |
801 | { | |
a5766f11 | 802 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 803 | |
414c70cb LG |
804 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
805 | } | |
7ad68e2f DB |
806 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
807 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
808 | |
809 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
810 | struct device_attribute *attr, char *buf) | |
811 | { | |
a5766f11 | 812 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 813 | |
414c70cb LG |
814 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
815 | } | |
7ad68e2f DB |
816 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
817 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
818 | |
819 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
820 | struct device_attribute *attr, char *buf) | |
821 | { | |
a5766f11 | 822 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 823 | |
414c70cb LG |
824 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
825 | } | |
7ad68e2f DB |
826 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
827 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 828 | |
414c70cb LG |
829 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
830 | struct device_attribute *attr, char *buf) | |
831 | { | |
a5766f11 | 832 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 833 | |
4fca9545 DB |
834 | return regulator_print_opmode(buf, |
835 | rdev->constraints->state_mem.mode); | |
414c70cb | 836 | } |
7ad68e2f DB |
837 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
838 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
839 | |
840 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
841 | struct device_attribute *attr, char *buf) | |
842 | { | |
a5766f11 | 843 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 844 | |
4fca9545 DB |
845 | return regulator_print_opmode(buf, |
846 | rdev->constraints->state_disk.mode); | |
414c70cb | 847 | } |
7ad68e2f DB |
848 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
849 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
850 | |
851 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
852 | struct device_attribute *attr, char *buf) | |
853 | { | |
a5766f11 | 854 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 855 | |
4fca9545 DB |
856 | return regulator_print_opmode(buf, |
857 | rdev->constraints->state_standby.mode); | |
414c70cb | 858 | } |
7ad68e2f DB |
859 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
860 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
861 | |
862 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
863 | struct device_attribute *attr, char *buf) | |
864 | { | |
a5766f11 | 865 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 866 | |
4fca9545 DB |
867 | return regulator_print_state(buf, |
868 | rdev->constraints->state_mem.enabled); | |
414c70cb | 869 | } |
7ad68e2f DB |
870 | static DEVICE_ATTR(suspend_mem_state, 0444, |
871 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
872 | |
873 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
874 | struct device_attribute *attr, char *buf) | |
875 | { | |
a5766f11 | 876 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 877 | |
4fca9545 DB |
878 | return regulator_print_state(buf, |
879 | rdev->constraints->state_disk.enabled); | |
414c70cb | 880 | } |
7ad68e2f DB |
881 | static DEVICE_ATTR(suspend_disk_state, 0444, |
882 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
883 | |
884 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
885 | struct device_attribute *attr, char *buf) | |
886 | { | |
a5766f11 | 887 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 888 | |
4fca9545 DB |
889 | return regulator_print_state(buf, |
890 | rdev->constraints->state_standby.enabled); | |
414c70cb | 891 | } |
7ad68e2f DB |
892 | static DEVICE_ATTR(suspend_standby_state, 0444, |
893 | regulator_suspend_standby_state_show, NULL); | |
894 | ||
f59c8f9f MB |
895 | static ssize_t regulator_bypass_show(struct device *dev, |
896 | struct device_attribute *attr, char *buf) | |
897 | { | |
898 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
899 | const char *report; | |
900 | bool bypass; | |
901 | int ret; | |
902 | ||
903 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
904 | ||
905 | if (ret != 0) | |
906 | report = "unknown"; | |
907 | else if (bypass) | |
908 | report = "enabled"; | |
909 | else | |
910 | report = "disabled"; | |
911 | ||
912 | return sprintf(buf, "%s\n", report); | |
913 | } | |
914 | static DEVICE_ATTR(bypass, 0444, | |
915 | regulator_bypass_show, NULL); | |
bc558a60 | 916 | |
414c70cb LG |
917 | /* Calculate the new optimum regulator operating mode based on the new total |
918 | * consumer load. All locks held by caller */ | |
8460ef38 | 919 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
920 | { |
921 | struct regulator *sibling; | |
922 | int current_uA = 0, output_uV, input_uV, err; | |
923 | unsigned int mode; | |
924 | ||
f8702f9e | 925 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 926 | |
8460ef38 BA |
927 | /* |
928 | * first check to see if we can set modes at all, otherwise just | |
929 | * tell the consumer everything is OK. | |
930 | */ | |
8a34e979 | 931 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
8460ef38 BA |
932 | return 0; |
933 | ||
8f4490e0 BA |
934 | if (!rdev->desc->ops->get_optimum_mode && |
935 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
936 | return 0; |
937 | ||
8f4490e0 BA |
938 | if (!rdev->desc->ops->set_mode && |
939 | !rdev->desc->ops->set_load) | |
8460ef38 | 940 | return -EINVAL; |
414c70cb | 941 | |
414c70cb | 942 | /* calc total requested load */ |
5451781d DA |
943 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
944 | if (sibling->enable_count) | |
945 | current_uA += sibling->uA_load; | |
946 | } | |
414c70cb | 947 | |
22a10bca SB |
948 | current_uA += rdev->constraints->system_load; |
949 | ||
8f4490e0 BA |
950 | if (rdev->desc->ops->set_load) { |
951 | /* set the optimum mode for our new total regulator load */ | |
952 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
953 | if (err < 0) | |
954 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
955 | } else { | |
57776617 JP |
956 | /* get output voltage */ |
957 | output_uV = _regulator_get_voltage(rdev); | |
958 | if (output_uV <= 0) { | |
959 | rdev_err(rdev, "invalid output voltage found\n"); | |
960 | return -EINVAL; | |
961 | } | |
962 | ||
963 | /* get input voltage */ | |
964 | input_uV = 0; | |
965 | if (rdev->supply) | |
966 | input_uV = regulator_get_voltage(rdev->supply); | |
967 | if (input_uV <= 0) | |
968 | input_uV = rdev->constraints->input_uV; | |
969 | if (input_uV <= 0) { | |
970 | rdev_err(rdev, "invalid input voltage found\n"); | |
971 | return -EINVAL; | |
972 | } | |
973 | ||
8f4490e0 BA |
974 | /* now get the optimum mode for our new total regulator load */ |
975 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
976 | output_uV, current_uA); | |
977 | ||
978 | /* check the new mode is allowed */ | |
979 | err = regulator_mode_constrain(rdev, &mode); | |
980 | if (err < 0) { | |
981 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
982 | current_uA, input_uV, output_uV); | |
983 | return err; | |
984 | } | |
414c70cb | 985 | |
8f4490e0 BA |
986 | err = rdev->desc->ops->set_mode(rdev, mode); |
987 | if (err < 0) | |
988 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
989 | } |
990 | ||
8460ef38 | 991 | return err; |
414c70cb LG |
992 | } |
993 | ||
994 | static int suspend_set_state(struct regulator_dev *rdev, | |
f7efad10 | 995 | suspend_state_t state) |
414c70cb LG |
996 | { |
997 | int ret = 0; | |
f7efad10 CZ |
998 | struct regulator_state *rstate; |
999 | ||
1000 | rstate = regulator_get_suspend_state(rdev, state); | |
1001 | if (rstate == NULL) | |
57a0dd18 | 1002 | return 0; |
638f85c5 MB |
1003 | |
1004 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
1005 | * only warn if the driver implements set_suspend_voltage or |
1006 | * set_suspend_mode callback. | |
638f85c5 | 1007 | */ |
72069f99 CZ |
1008 | if (rstate->enabled != ENABLE_IN_SUSPEND && |
1009 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
8ac0e95d AL |
1010 | if (rdev->desc->ops->set_suspend_voltage || |
1011 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 1012 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
1013 | return 0; |
1014 | } | |
1015 | ||
72069f99 CZ |
1016 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1017 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1018 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1019 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1020 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1021 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1022 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1023 | ret = 0; | |
1024 | ||
414c70cb | 1025 | if (ret < 0) { |
5da84fd9 | 1026 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
1027 | return ret; |
1028 | } | |
1029 | ||
1030 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1031 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1032 | if (ret < 0) { | |
5da84fd9 | 1033 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
1034 | return ret; |
1035 | } | |
1036 | } | |
1037 | ||
1038 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1039 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1040 | if (ret < 0) { | |
5da84fd9 | 1041 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
1042 | return ret; |
1043 | } | |
1044 | } | |
414c70cb | 1045 | |
f7efad10 | 1046 | return ret; |
414c70cb LG |
1047 | } |
1048 | ||
1049 | static void print_constraints(struct regulator_dev *rdev) | |
1050 | { | |
1051 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1052 | char buf[160] = ""; |
5751a99f | 1053 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1054 | int count = 0; |
1055 | int ret; | |
414c70cb | 1056 | |
8f031b48 | 1057 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1058 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1059 | count += scnprintf(buf + count, len - count, "%d mV ", |
1060 | constraints->min_uV / 1000); | |
414c70cb | 1061 | else |
5751a99f SW |
1062 | count += scnprintf(buf + count, len - count, |
1063 | "%d <--> %d mV ", | |
1064 | constraints->min_uV / 1000, | |
1065 | constraints->max_uV / 1000); | |
8f031b48 MB |
1066 | } |
1067 | ||
1068 | if (!constraints->min_uV || | |
1069 | constraints->min_uV != constraints->max_uV) { | |
1070 | ret = _regulator_get_voltage(rdev); | |
1071 | if (ret > 0) | |
5751a99f SW |
1072 | count += scnprintf(buf + count, len - count, |
1073 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1074 | } |
1075 | ||
bf5892a8 | 1076 | if (constraints->uV_offset) |
5751a99f SW |
1077 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1078 | constraints->uV_offset / 1000); | |
bf5892a8 | 1079 | |
8f031b48 | 1080 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1081 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1082 | count += scnprintf(buf + count, len - count, "%d mA ", |
1083 | constraints->min_uA / 1000); | |
414c70cb | 1084 | else |
5751a99f SW |
1085 | count += scnprintf(buf + count, len - count, |
1086 | "%d <--> %d mA ", | |
1087 | constraints->min_uA / 1000, | |
1088 | constraints->max_uA / 1000); | |
8f031b48 MB |
1089 | } |
1090 | ||
1091 | if (!constraints->min_uA || | |
1092 | constraints->min_uA != constraints->max_uA) { | |
1093 | ret = _regulator_get_current_limit(rdev); | |
1094 | if (ret > 0) | |
5751a99f SW |
1095 | count += scnprintf(buf + count, len - count, |
1096 | "at %d mA ", ret / 1000); | |
414c70cb | 1097 | } |
8f031b48 | 1098 | |
414c70cb | 1099 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1100 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1101 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1102 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1103 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1104 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1105 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 1106 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 1107 | |
215b8b05 | 1108 | if (!count) |
5751a99f | 1109 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 1110 | |
194dbaef | 1111 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
1112 | |
1113 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1114 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1115 | rdev_warn(rdev, |
1116 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1117 | } |
1118 | ||
e79055d6 | 1119 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1120 | struct regulation_constraints *constraints) |
a5766f11 | 1121 | { |
272e2315 | 1122 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1123 | int ret; |
1124 | ||
1125 | /* do we need to apply the constraint voltage */ | |
1126 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1127 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1128 | int target_min, target_max; | |
064d5cd1 | 1129 | int current_uV = _regulator_get_voltage(rdev); |
84b3a7c9 DA |
1130 | |
1131 | if (current_uV == -ENOTRECOVERABLE) { | |
1132 | /* This regulator can't be read and must be initted */ | |
1133 | rdev_info(rdev, "Setting %d-%duV\n", | |
1134 | rdev->constraints->min_uV, | |
1135 | rdev->constraints->max_uV); | |
1136 | _regulator_do_set_voltage(rdev, | |
1137 | rdev->constraints->min_uV, | |
1138 | rdev->constraints->max_uV); | |
1139 | current_uV = _regulator_get_voltage(rdev); | |
1140 | } | |
1141 | ||
064d5cd1 | 1142 | if (current_uV < 0) { |
69d58839 NM |
1143 | rdev_err(rdev, |
1144 | "failed to get the current voltage(%d)\n", | |
1145 | current_uV); | |
064d5cd1 AB |
1146 | return current_uV; |
1147 | } | |
fa93fd4e MB |
1148 | |
1149 | /* | |
1150 | * If we're below the minimum voltage move up to the | |
1151 | * minimum voltage, if we're above the maximum voltage | |
1152 | * then move down to the maximum. | |
1153 | */ | |
1154 | target_min = current_uV; | |
1155 | target_max = current_uV; | |
1156 | ||
1157 | if (current_uV < rdev->constraints->min_uV) { | |
1158 | target_min = rdev->constraints->min_uV; | |
1159 | target_max = rdev->constraints->min_uV; | |
1160 | } | |
1161 | ||
1162 | if (current_uV > rdev->constraints->max_uV) { | |
1163 | target_min = rdev->constraints->max_uV; | |
1164 | target_max = rdev->constraints->max_uV; | |
1165 | } | |
1166 | ||
1167 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1168 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1169 | current_uV, target_min, target_max); | |
064d5cd1 | 1170 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1171 | rdev, target_min, target_max); |
064d5cd1 AB |
1172 | if (ret < 0) { |
1173 | rdev_err(rdev, | |
fa93fd4e MB |
1174 | "failed to apply %d-%duV constraint(%d)\n", |
1175 | target_min, target_max, ret); | |
064d5cd1 AB |
1176 | return ret; |
1177 | } | |
75790251 | 1178 | } |
af5866c9 | 1179 | } |
e06f5b4f | 1180 | |
4367cfdc DB |
1181 | /* constrain machine-level voltage specs to fit |
1182 | * the actual range supported by this regulator. | |
1183 | */ | |
1184 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1185 | int count = rdev->desc->n_voltages; | |
1186 | int i; | |
1187 | int min_uV = INT_MAX; | |
1188 | int max_uV = INT_MIN; | |
1189 | int cmin = constraints->min_uV; | |
1190 | int cmax = constraints->max_uV; | |
1191 | ||
3e590918 MB |
1192 | /* it's safe to autoconfigure fixed-voltage supplies |
1193 | and the constraints are used by list_voltage. */ | |
4367cfdc | 1194 | if (count == 1 && !cmin) { |
3e590918 | 1195 | cmin = 1; |
4367cfdc | 1196 | cmax = INT_MAX; |
3e590918 MB |
1197 | constraints->min_uV = cmin; |
1198 | constraints->max_uV = cmax; | |
4367cfdc DB |
1199 | } |
1200 | ||
3e2b9abd MB |
1201 | /* voltage constraints are optional */ |
1202 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1203 | return 0; |
3e2b9abd | 1204 | |
4367cfdc | 1205 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1206 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1207 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1208 | return -EINVAL; |
4367cfdc DB |
1209 | } |
1210 | ||
1211 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
1212 | for (i = 0; i < count; i++) { | |
1213 | int value; | |
1214 | ||
1215 | value = ops->list_voltage(rdev, i); | |
1216 | if (value <= 0) | |
1217 | continue; | |
1218 | ||
1219 | /* maybe adjust [min_uV..max_uV] */ | |
1220 | if (value >= cmin && value < min_uV) | |
1221 | min_uV = value; | |
1222 | if (value <= cmax && value > max_uV) | |
1223 | max_uV = value; | |
1224 | } | |
1225 | ||
1226 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1227 | if (max_uV < min_uV) { | |
fff15bef MB |
1228 | rdev_err(rdev, |
1229 | "unsupportable voltage constraints %u-%uuV\n", | |
1230 | min_uV, max_uV); | |
e79055d6 | 1231 | return -EINVAL; |
4367cfdc DB |
1232 | } |
1233 | ||
1234 | /* use regulator's subset of machine constraints */ | |
1235 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1236 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1237 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1238 | constraints->min_uV = min_uV; |
1239 | } | |
1240 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1241 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1242 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1243 | constraints->max_uV = max_uV; |
1244 | } | |
1245 | } | |
1246 | ||
e79055d6 MB |
1247 | return 0; |
1248 | } | |
1249 | ||
f8c1700d LD |
1250 | static int machine_constraints_current(struct regulator_dev *rdev, |
1251 | struct regulation_constraints *constraints) | |
1252 | { | |
272e2315 | 1253 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1254 | int ret; |
1255 | ||
1256 | if (!constraints->min_uA && !constraints->max_uA) | |
1257 | return 0; | |
1258 | ||
1259 | if (constraints->min_uA > constraints->max_uA) { | |
1260 | rdev_err(rdev, "Invalid current constraints\n"); | |
1261 | return -EINVAL; | |
1262 | } | |
1263 | ||
1264 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1265 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | /* Set regulator current in constraints range */ | |
1270 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1271 | constraints->max_uA); | |
1272 | if (ret < 0) { | |
1273 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1274 | return ret; | |
1275 | } | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
30c21971 MP |
1280 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1281 | ||
e79055d6 MB |
1282 | /** |
1283 | * set_machine_constraints - sets regulator constraints | |
1284 | * @rdev: regulator source | |
1285 | * @constraints: constraints to apply | |
1286 | * | |
1287 | * Allows platform initialisation code to define and constrain | |
1288 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1289 | * Constraints *must* be set by platform code in order for some | |
1290 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1291 | * set_mode. | |
1292 | */ | |
1293 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1294 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1295 | { |
1296 | int ret = 0; | |
272e2315 | 1297 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1298 | |
9a8f5e07 MB |
1299 | if (constraints) |
1300 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1301 | GFP_KERNEL); | |
1302 | else | |
1303 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1304 | GFP_KERNEL); | |
f8c12fe3 MB |
1305 | if (!rdev->constraints) |
1306 | return -ENOMEM; | |
af5866c9 | 1307 | |
f8c12fe3 | 1308 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1309 | if (ret != 0) |
6333ef46 | 1310 | return ret; |
e79055d6 | 1311 | |
f8c1700d | 1312 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1313 | if (ret != 0) |
6333ef46 | 1314 | return ret; |
e79055d6 | 1315 | |
36e4f839 SB |
1316 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1317 | ret = ops->set_input_current_limit(rdev, | |
1318 | rdev->constraints->ilim_uA); | |
1319 | if (ret < 0) { | |
1320 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1321 | return ret; |
36e4f839 SB |
1322 | } |
1323 | } | |
1324 | ||
a5766f11 | 1325 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1326 | if (rdev->constraints->initial_state) { |
f7efad10 | 1327 | ret = suspend_set_state(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1328 | if (ret < 0) { |
5da84fd9 | 1329 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1330 | return ret; |
e06f5b4f MB |
1331 | } |
1332 | } | |
a5766f11 | 1333 | |
9a8f5e07 | 1334 | if (rdev->constraints->initial_mode) { |
a308466c | 1335 | if (!ops->set_mode) { |
5da84fd9 | 1336 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1337 | return -EINVAL; |
a308466c MB |
1338 | } |
1339 | ||
f8c12fe3 | 1340 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1341 | if (ret < 0) { |
5da84fd9 | 1342 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1343 | return ret; |
a308466c | 1344 | } |
fa94e48e DA |
1345 | } else if (rdev->constraints->system_load) { |
1346 | /* | |
1347 | * We'll only apply the initial system load if an | |
1348 | * initial mode wasn't specified. | |
1349 | */ | |
1350 | drms_uA_update(rdev); | |
a308466c MB |
1351 | } |
1352 | ||
cacf90f2 MB |
1353 | /* If the constraints say the regulator should be on at this point |
1354 | * and we have control then make sure it is enabled. | |
1355 | */ | |
30c21971 MP |
1356 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1357 | ret = _regulator_do_enable(rdev); | |
1358 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1359 | rdev_err(rdev, "failed to enable\n"); |
6333ef46 | 1360 | return ret; |
e5fda26c MB |
1361 | } |
1362 | } | |
1363 | ||
1653ccf4 YSB |
1364 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1365 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1366 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1367 | if (ret < 0) { | |
1368 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1369 | return ret; |
6f0b2c69 YSB |
1370 | } |
1371 | } | |
1372 | ||
23c779b9 SB |
1373 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1374 | ret = ops->set_pull_down(rdev); | |
1375 | if (ret < 0) { | |
1376 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1377 | return ret; |
23c779b9 SB |
1378 | } |
1379 | } | |
1380 | ||
57f66b78 SB |
1381 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1382 | ret = ops->set_soft_start(rdev); | |
1383 | if (ret < 0) { | |
1384 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1385 | return ret; |
57f66b78 SB |
1386 | } |
1387 | } | |
1388 | ||
3a003bae SB |
1389 | if (rdev->constraints->over_current_protection |
1390 | && ops->set_over_current_protection) { | |
1391 | ret = ops->set_over_current_protection(rdev); | |
1392 | if (ret < 0) { | |
1393 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1394 | return ret; |
3a003bae SB |
1395 | } |
1396 | } | |
1397 | ||
670666b9 LD |
1398 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1399 | bool ad_state = (rdev->constraints->active_discharge == | |
1400 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1401 | ||
1402 | ret = ops->set_active_discharge(rdev, ad_state); | |
1403 | if (ret < 0) { | |
1404 | rdev_err(rdev, "failed to set active discharge\n"); | |
1405 | return ret; | |
1406 | } | |
1407 | } | |
1408 | ||
a5766f11 | 1409 | print_constraints(rdev); |
1a6958e7 | 1410 | return 0; |
a5766f11 LG |
1411 | } |
1412 | ||
1413 | /** | |
1414 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1415 | * @rdev: regulator name |
1416 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1417 | * |
1418 | * Called by platform initialisation code to set the supply regulator for this | |
1419 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1420 | * core if it's child is enabled. | |
1421 | */ | |
1422 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1423 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1424 | { |
1425 | int err; | |
1426 | ||
3801b86a MB |
1427 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1428 | ||
e2c09ae7 JMC |
1429 | if (!try_module_get(supply_rdev->owner)) |
1430 | return -ENODEV; | |
1431 | ||
3801b86a | 1432 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1433 | if (rdev->supply == NULL) { |
1434 | err = -ENOMEM; | |
3801b86a | 1435 | return err; |
a5766f11 | 1436 | } |
57ad526a | 1437 | supply_rdev->open_count++; |
3801b86a MB |
1438 | |
1439 | return 0; | |
a5766f11 LG |
1440 | } |
1441 | ||
1442 | /** | |
06c63f93 | 1443 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1444 | * @rdev: regulator source |
40f9244f | 1445 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1446 | * @supply: symbolic name for supply |
a5766f11 LG |
1447 | * |
1448 | * Allows platform initialisation code to map physical regulator | |
1449 | * sources to symbolic names for supplies for use by devices. Devices | |
1450 | * should use these symbolic names to request regulators, avoiding the | |
1451 | * need to provide board-specific regulator names as platform data. | |
1452 | */ | |
1453 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1454 | const char *consumer_dev_name, |
1455 | const char *supply) | |
a5766f11 LG |
1456 | { |
1457 | struct regulator_map *node; | |
9ed2099e | 1458 | int has_dev; |
a5766f11 LG |
1459 | |
1460 | if (supply == NULL) | |
1461 | return -EINVAL; | |
1462 | ||
9ed2099e MB |
1463 | if (consumer_dev_name != NULL) |
1464 | has_dev = 1; | |
1465 | else | |
1466 | has_dev = 0; | |
1467 | ||
6001e13c | 1468 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1469 | if (node->dev_name && consumer_dev_name) { |
1470 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1471 | continue; | |
1472 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1473 | continue; |
23b5cc2a JN |
1474 | } |
1475 | ||
6001e13c DB |
1476 | if (strcmp(node->supply, supply) != 0) |
1477 | continue; | |
1478 | ||
737f360d MB |
1479 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1480 | consumer_dev_name, | |
1481 | dev_name(&node->regulator->dev), | |
1482 | node->regulator->desc->name, | |
1483 | supply, | |
1484 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1485 | return -EBUSY; |
1486 | } | |
1487 | ||
9ed2099e | 1488 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1489 | if (node == NULL) |
1490 | return -ENOMEM; | |
1491 | ||
1492 | node->regulator = rdev; | |
a5766f11 LG |
1493 | node->supply = supply; |
1494 | ||
9ed2099e MB |
1495 | if (has_dev) { |
1496 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1497 | if (node->dev_name == NULL) { | |
1498 | kfree(node); | |
1499 | return -ENOMEM; | |
1500 | } | |
40f9244f MB |
1501 | } |
1502 | ||
a5766f11 LG |
1503 | list_add(&node->list, ®ulator_map_list); |
1504 | return 0; | |
1505 | } | |
1506 | ||
0f1d747b MR |
1507 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1508 | { | |
1509 | struct regulator_map *node, *n; | |
1510 | ||
1511 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1512 | if (rdev == node->regulator) { | |
1513 | list_del(&node->list); | |
40f9244f | 1514 | kfree(node->dev_name); |
0f1d747b | 1515 | kfree(node); |
0f1d747b MR |
1516 | } |
1517 | } | |
1518 | } | |
1519 | ||
2d80a91b RF |
1520 | #ifdef CONFIG_DEBUG_FS |
1521 | static ssize_t constraint_flags_read_file(struct file *file, | |
1522 | char __user *user_buf, | |
1523 | size_t count, loff_t *ppos) | |
1524 | { | |
1525 | const struct regulator *regulator = file->private_data; | |
1526 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1527 | char *buf; | |
1528 | ssize_t ret; | |
1529 | ||
1530 | if (!c) | |
1531 | return 0; | |
1532 | ||
1533 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1534 | if (!buf) | |
1535 | return -ENOMEM; | |
1536 | ||
1537 | ret = snprintf(buf, PAGE_SIZE, | |
1538 | "always_on: %u\n" | |
1539 | "boot_on: %u\n" | |
1540 | "apply_uV: %u\n" | |
1541 | "ramp_disable: %u\n" | |
1542 | "soft_start: %u\n" | |
1543 | "pull_down: %u\n" | |
1544 | "over_current_protection: %u\n", | |
1545 | c->always_on, | |
1546 | c->boot_on, | |
1547 | c->apply_uV, | |
1548 | c->ramp_disable, | |
1549 | c->soft_start, | |
1550 | c->pull_down, | |
1551 | c->over_current_protection); | |
1552 | ||
1553 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1554 | kfree(buf); | |
1555 | ||
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | #endif | |
1560 | ||
1561 | static const struct file_operations constraint_flags_fops = { | |
1562 | #ifdef CONFIG_DEBUG_FS | |
1563 | .open = simple_open, | |
1564 | .read = constraint_flags_read_file, | |
1565 | .llseek = default_llseek, | |
1566 | #endif | |
1567 | }; | |
1568 | ||
f5726ae3 | 1569 | #define REG_STR_SIZE 64 |
414c70cb LG |
1570 | |
1571 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1572 | struct device *dev, | |
1573 | const char *supply_name) | |
1574 | { | |
1575 | struct regulator *regulator; | |
1576 | char buf[REG_STR_SIZE]; | |
1577 | int err, size; | |
1578 | ||
1579 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1580 | if (regulator == NULL) | |
1581 | return NULL; | |
1582 | ||
66cf9a7e | 1583 | regulator_lock(rdev); |
414c70cb LG |
1584 | regulator->rdev = rdev; |
1585 | list_add(®ulator->list, &rdev->consumer_list); | |
1586 | ||
1587 | if (dev) { | |
e2c98eaf SG |
1588 | regulator->dev = dev; |
1589 | ||
222cc7b1 | 1590 | /* Add a link to the device sysfs entry */ |
b7cd1b13 BG |
1591 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", |
1592 | dev->kobj.name, supply_name); | |
414c70cb | 1593 | if (size >= REG_STR_SIZE) |
222cc7b1 | 1594 | goto overflow_err; |
414c70cb LG |
1595 | |
1596 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1597 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1598 | goto overflow_err; |
414c70cb | 1599 | |
ff268b56 | 1600 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1601 | buf); |
1602 | if (err) { | |
ff268b56 | 1603 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1604 | dev->kobj.name, err); |
222cc7b1 | 1605 | /* non-fatal */ |
414c70cb | 1606 | } |
5de70519 | 1607 | } else { |
0630b614 | 1608 | regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL); |
5de70519 | 1609 | if (regulator->supply_name == NULL) |
222cc7b1 | 1610 | goto overflow_err; |
5de70519 MB |
1611 | } |
1612 | ||
5de70519 MB |
1613 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1614 | rdev->debugfs); | |
24751434 | 1615 | if (!regulator->debugfs) { |
ad3a942b | 1616 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1617 | } else { |
1618 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1619 | ®ulator->uA_load); | |
1620 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1621 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1622 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1623 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1624 | debugfs_create_file("constraint_flags", 0444, |
1625 | regulator->debugfs, regulator, | |
1626 | &constraint_flags_fops); | |
414c70cb | 1627 | } |
5de70519 | 1628 | |
6492bc1b MB |
1629 | /* |
1630 | * Check now if the regulator is an always on regulator - if | |
1631 | * it is then we don't need to do nearly so much work for | |
1632 | * enable/disable calls. | |
1633 | */ | |
8a34e979 | 1634 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1635 | _regulator_is_enabled(rdev)) |
1636 | regulator->always_on = true; | |
1637 | ||
66cf9a7e | 1638 | regulator_unlock(rdev); |
414c70cb | 1639 | return regulator; |
414c70cb LG |
1640 | overflow_err: |
1641 | list_del(®ulator->list); | |
1642 | kfree(regulator); | |
66cf9a7e | 1643 | regulator_unlock(rdev); |
414c70cb LG |
1644 | return NULL; |
1645 | } | |
1646 | ||
31aae2be MB |
1647 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1648 | { | |
00c877c6 LD |
1649 | if (rdev->constraints && rdev->constraints->enable_time) |
1650 | return rdev->constraints->enable_time; | |
31aae2be | 1651 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1652 | return rdev->desc->enable_time; |
31aae2be MB |
1653 | return rdev->desc->ops->enable_time(rdev); |
1654 | } | |
1655 | ||
a06ccd9c CK |
1656 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1657 | struct device *dev, const char *supply) | |
1658 | { | |
1659 | struct regulator_supply_alias *map; | |
1660 | ||
1661 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1662 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1663 | return map; | |
1664 | ||
1665 | return NULL; | |
1666 | } | |
1667 | ||
1668 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1669 | { | |
1670 | struct regulator_supply_alias *map; | |
1671 | ||
1672 | map = regulator_find_supply_alias(*dev, *supply); | |
1673 | if (map) { | |
1674 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1675 | *supply, map->alias_supply, | |
1676 | dev_name(map->alias_dev)); | |
1677 | *dev = map->alias_dev; | |
1678 | *supply = map->alias_supply; | |
1679 | } | |
1680 | } | |
1681 | ||
85f3b431 TV |
1682 | static int regulator_match(struct device *dev, const void *data) |
1683 | { | |
1684 | struct regulator_dev *r = dev_to_rdev(dev); | |
1685 | ||
1686 | return strcmp(rdev_get_name(r), data) == 0; | |
1687 | } | |
1688 | ||
1689 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1690 | { | |
1691 | struct device *dev; | |
1692 | ||
1693 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1694 | ||
1695 | return dev ? dev_to_rdev(dev) : NULL; | |
1696 | } | |
1697 | ||
1698 | /** | |
1699 | * regulator_dev_lookup - lookup a regulator device. | |
1700 | * @dev: device for regulator "consumer". | |
1701 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1702 | * |
1703 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1704 | * @supply and with the embedded struct device refcount incremented by one. |
1705 | * The refcount must be dropped by calling put_device(). | |
1706 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1707 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1708 | * in the future. | |
85f3b431 | 1709 | */ |
69511a45 | 1710 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1711 | const char *supply) |
69511a45 | 1712 | { |
06217197 | 1713 | struct regulator_dev *r = NULL; |
69511a45 | 1714 | struct device_node *node; |
576ca436 MB |
1715 | struct regulator_map *map; |
1716 | const char *devname = NULL; | |
69511a45 | 1717 | |
a06ccd9c CK |
1718 | regulator_supply_alias(&dev, &supply); |
1719 | ||
69511a45 RN |
1720 | /* first do a dt based lookup */ |
1721 | if (dev && dev->of_node) { | |
1722 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1723 | if (node) { |
85f3b431 TV |
1724 | r = of_find_regulator_by_node(node); |
1725 | if (r) | |
1726 | return r; | |
163478da | 1727 | |
6d191a5f | 1728 | /* |
163478da DT |
1729 | * We have a node, but there is no device. |
1730 | * assume it has not registered yet. | |
6d191a5f | 1731 | */ |
163478da | 1732 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1733 | } |
69511a45 RN |
1734 | } |
1735 | ||
1736 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1737 | if (dev) |
1738 | devname = dev_name(dev); | |
1739 | ||
85f3b431 | 1740 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1741 | list_for_each_entry(map, ®ulator_map_list, list) { |
1742 | /* If the mapping has a device set up it must match */ | |
1743 | if (map->dev_name && | |
1744 | (!devname || strcmp(map->dev_name, devname))) | |
1745 | continue; | |
1746 | ||
85f3b431 TV |
1747 | if (strcmp(map->supply, supply) == 0 && |
1748 | get_device(&map->regulator->dev)) { | |
163478da DT |
1749 | r = map->regulator; |
1750 | break; | |
85f3b431 | 1751 | } |
576ca436 | 1752 | } |
85f3b431 | 1753 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1754 | |
06217197 CK |
1755 | if (r) |
1756 | return r; | |
1757 | ||
1758 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1759 | if (r) |
1760 | return r; | |
1761 | ||
1762 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1763 | } |
1764 | ||
6261b06d BA |
1765 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1766 | { | |
1767 | struct regulator_dev *r; | |
1768 | struct device *dev = rdev->dev.parent; | |
1769 | int ret; | |
1770 | ||
1771 | /* No supply to resovle? */ | |
1772 | if (!rdev->supply_name) | |
1773 | return 0; | |
1774 | ||
1775 | /* Supply already resolved? */ | |
1776 | if (rdev->supply) | |
1777 | return 0; | |
1778 | ||
163478da DT |
1779 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1780 | if (IS_ERR(r)) { | |
1781 | ret = PTR_ERR(r); | |
1782 | ||
06423121 MB |
1783 | /* Did the lookup explicitly defer for us? */ |
1784 | if (ret == -EPROBE_DEFER) | |
1785 | return ret; | |
1786 | ||
9f7e25ed MB |
1787 | if (have_full_constraints()) { |
1788 | r = dummy_regulator_rdev; | |
85f3b431 | 1789 | get_device(&r->dev); |
9f7e25ed MB |
1790 | } else { |
1791 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1792 | rdev->supply_name, rdev->desc->name); | |
1793 | return -EPROBE_DEFER; | |
1794 | } | |
6261b06d BA |
1795 | } |
1796 | ||
66d228a2 JH |
1797 | /* |
1798 | * If the supply's parent device is not the same as the | |
1799 | * regulator's parent device, then ensure the parent device | |
1800 | * is bound before we resolve the supply, in case the parent | |
1801 | * device get probe deferred and unregisters the supply. | |
1802 | */ | |
1803 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1804 | if (!device_is_bound(r->dev.parent)) { | |
1805 | put_device(&r->dev); | |
1806 | return -EPROBE_DEFER; | |
1807 | } | |
1808 | } | |
1809 | ||
6261b06d BA |
1810 | /* Recursively resolve the supply of the supply */ |
1811 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1812 | if (ret < 0) { |
1813 | put_device(&r->dev); | |
6261b06d | 1814 | return ret; |
85f3b431 | 1815 | } |
6261b06d BA |
1816 | |
1817 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1818 | if (ret < 0) { |
1819 | put_device(&r->dev); | |
6261b06d | 1820 | return ret; |
85f3b431 | 1821 | } |
6261b06d BA |
1822 | |
1823 | /* Cascade always-on state to supply */ | |
95a293c7 | 1824 | if (_regulator_is_enabled(rdev)) { |
6261b06d | 1825 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1826 | if (ret < 0) { |
9f8df6ad | 1827 | _regulator_put(rdev->supply); |
8e5356a7 | 1828 | rdev->supply = NULL; |
6261b06d | 1829 | return ret; |
36a1f1b6 | 1830 | } |
1fc12b05 | 1831 | rdev->use_count = 1; |
6261b06d BA |
1832 | } |
1833 | ||
1834 | return 0; | |
1835 | } | |
1836 | ||
5ffbd136 | 1837 | /* Internal regulator request function */ |
a8bd42a9 DT |
1838 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1839 | enum regulator_get_type get_type) | |
414c70cb LG |
1840 | { |
1841 | struct regulator_dev *rdev; | |
7d245afa | 1842 | struct regulator *regulator; |
a4d7641f | 1843 | const char *devname = dev ? dev_name(dev) : "deviceless"; |
317b5684 | 1844 | int ret; |
414c70cb | 1845 | |
a8bd42a9 DT |
1846 | if (get_type >= MAX_GET_TYPE) { |
1847 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1848 | return ERR_PTR(-EINVAL); | |
1849 | } | |
1850 | ||
414c70cb | 1851 | if (id == NULL) { |
5da84fd9 | 1852 | pr_err("get() with no identifier\n"); |
043c998f | 1853 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1854 | } |
1855 | ||
163478da | 1856 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1857 | if (IS_ERR(rdev)) { |
1858 | ret = PTR_ERR(rdev); | |
1e4b545c | 1859 | |
a4d7641f DT |
1860 | /* |
1861 | * If regulator_dev_lookup() fails with error other | |
1862 | * than -ENODEV our job here is done, we simply return it. | |
1863 | */ | |
1864 | if (ret != -ENODEV) | |
1865 | return ERR_PTR(ret); | |
34abbd68 | 1866 | |
a4d7641f DT |
1867 | if (!have_full_constraints()) { |
1868 | dev_warn(dev, | |
1869 | "incomplete constraints, dummy supplies not allowed\n"); | |
1870 | return ERR_PTR(-ENODEV); | |
1871 | } | |
4ddfebd3 | 1872 | |
a4d7641f DT |
1873 | switch (get_type) { |
1874 | case NORMAL_GET: | |
1875 | /* | |
1876 | * Assume that a regulator is physically present and | |
1877 | * enabled, even if it isn't hooked up, and just | |
1878 | * provide a dummy. | |
1879 | */ | |
1880 | dev_warn(dev, | |
1881 | "%s supply %s not found, using dummy regulator\n", | |
1882 | devname, id); | |
1883 | rdev = dummy_regulator_rdev; | |
1884 | get_device(&rdev->dev); | |
1885 | break; | |
34abbd68 | 1886 | |
a4d7641f DT |
1887 | case EXCLUSIVE_GET: |
1888 | dev_warn(dev, | |
1889 | "dummy supplies not allowed for exclusive requests\n"); | |
1890 | /* fall through */ | |
34abbd68 | 1891 | |
a4d7641f DT |
1892 | default: |
1893 | return ERR_PTR(-ENODEV); | |
1894 | } | |
34abbd68 | 1895 | } |
34abbd68 | 1896 | |
5ffbd136 MB |
1897 | if (rdev->exclusive) { |
1898 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1899 | put_device(&rdev->dev); |
1900 | return regulator; | |
5ffbd136 MB |
1901 | } |
1902 | ||
a8bd42a9 | 1903 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1904 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1905 | put_device(&rdev->dev); |
1906 | return regulator; | |
5ffbd136 MB |
1907 | } |
1908 | ||
79d6f049 DO |
1909 | mutex_lock(®ulator_list_mutex); |
1910 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1911 | mutex_unlock(®ulator_list_mutex); | |
1912 | ||
1913 | if (ret != 0) { | |
1914 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1915 | put_device(&rdev->dev); | |
1916 | return regulator; | |
1917 | } | |
1918 | ||
6261b06d BA |
1919 | ret = regulator_resolve_supply(rdev); |
1920 | if (ret < 0) { | |
1921 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1922 | put_device(&rdev->dev); |
1923 | return regulator; | |
6261b06d BA |
1924 | } |
1925 | ||
85f3b431 | 1926 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1927 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1928 | put_device(&rdev->dev); |
1929 | return regulator; | |
1930 | } | |
a5766f11 | 1931 | |
414c70cb LG |
1932 | regulator = create_regulator(rdev, dev, id); |
1933 | if (regulator == NULL) { | |
1934 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1935 | put_device(&rdev->dev); |
414c70cb | 1936 | module_put(rdev->owner); |
85f3b431 | 1937 | return regulator; |
414c70cb LG |
1938 | } |
1939 | ||
5ffbd136 | 1940 | rdev->open_count++; |
a8bd42a9 | 1941 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1942 | rdev->exclusive = 1; |
1943 | ||
1944 | ret = _regulator_is_enabled(rdev); | |
1945 | if (ret > 0) | |
1946 | rdev->use_count = 1; | |
1947 | else | |
1948 | rdev->use_count = 0; | |
1949 | } | |
1950 | ||
ed1ae2dd | 1951 | device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
1952 | ||
414c70cb LG |
1953 | return regulator; |
1954 | } | |
5ffbd136 MB |
1955 | |
1956 | /** | |
1957 | * regulator_get - lookup and obtain a reference to a regulator. | |
1958 | * @dev: device for regulator "consumer" | |
1959 | * @id: Supply name or regulator ID. | |
1960 | * | |
1961 | * Returns a struct regulator corresponding to the regulator producer, | |
1962 | * or IS_ERR() condition containing errno. | |
1963 | * | |
1964 | * Use of supply names configured via regulator_set_device_supply() is | |
1965 | * strongly encouraged. It is recommended that the supply name used | |
1966 | * should match the name used for the supply and/or the relevant | |
1967 | * device pins in the datasheet. | |
1968 | */ | |
1969 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1970 | { | |
a8bd42a9 | 1971 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 1972 | } |
414c70cb LG |
1973 | EXPORT_SYMBOL_GPL(regulator_get); |
1974 | ||
5ffbd136 MB |
1975 | /** |
1976 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1977 | * @dev: device for regulator "consumer" | |
1978 | * @id: Supply name or regulator ID. | |
1979 | * | |
1980 | * Returns a struct regulator corresponding to the regulator producer, | |
1981 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1982 | * unable to obtain this regulator while this reference is held and the |
1983 | * use count for the regulator will be initialised to reflect the current | |
1984 | * state of the regulator. | |
5ffbd136 MB |
1985 | * |
1986 | * This is intended for use by consumers which cannot tolerate shared | |
1987 | * use of the regulator such as those which need to force the | |
1988 | * regulator off for correct operation of the hardware they are | |
1989 | * controlling. | |
1990 | * | |
1991 | * Use of supply names configured via regulator_set_device_supply() is | |
1992 | * strongly encouraged. It is recommended that the supply name used | |
1993 | * should match the name used for the supply and/or the relevant | |
1994 | * device pins in the datasheet. | |
1995 | */ | |
1996 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1997 | { | |
a8bd42a9 | 1998 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
1999 | } |
2000 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2001 | ||
de1dd9fd MB |
2002 | /** |
2003 | * regulator_get_optional - obtain optional access to a regulator. | |
2004 | * @dev: device for regulator "consumer" | |
2005 | * @id: Supply name or regulator ID. | |
2006 | * | |
2007 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2008 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2009 | * |
2010 | * This is intended for use by consumers for devices which can have | |
2011 | * some supplies unconnected in normal use, such as some MMC devices. | |
2012 | * It can allow the regulator core to provide stub supplies for other | |
2013 | * supplies requested using normal regulator_get() calls without | |
2014 | * disrupting the operation of drivers that can handle absent | |
2015 | * supplies. | |
2016 | * | |
2017 | * Use of supply names configured via regulator_set_device_supply() is | |
2018 | * strongly encouraged. It is recommended that the supply name used | |
2019 | * should match the name used for the supply and/or the relevant | |
2020 | * device pins in the datasheet. | |
2021 | */ | |
2022 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2023 | { | |
a8bd42a9 | 2024 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2025 | } |
2026 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2027 | ||
83b0302d | 2028 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 2029 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
2030 | { |
2031 | struct regulator_dev *rdev; | |
2032 | ||
93576842 | 2033 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
2034 | return; |
2035 | ||
70cfef26 KK |
2036 | lockdep_assert_held_once(®ulator_list_mutex); |
2037 | ||
5451781d DA |
2038 | /* Docs say you must disable before calling regulator_put() */ |
2039 | WARN_ON(regulator->enable_count); | |
2040 | ||
414c70cb LG |
2041 | rdev = regulator->rdev; |
2042 | ||
5de70519 | 2043 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2044 | |
ed1ae2dd | 2045 | if (regulator->dev) { |
2046 | int count = 0; | |
2047 | struct regulator *r; | |
2048 | ||
2049 | list_for_each_entry(r, &rdev->consumer_list, list) | |
2050 | if (r->dev == regulator->dev) | |
2051 | count++; | |
2052 | ||
2053 | if (count == 1) | |
2054 | device_link_remove(regulator->dev, &rdev->dev); | |
2055 | ||
2056 | /* remove any sysfs entries */ | |
414c70cb | 2057 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2058 | } |
2059 | ||
66cf9a7e | 2060 | regulator_lock(rdev); |
414c70cb | 2061 | list_del(®ulator->list); |
414c70cb | 2062 | |
5ffbd136 MB |
2063 | rdev->open_count--; |
2064 | rdev->exclusive = 0; | |
85f3b431 | 2065 | put_device(&rdev->dev); |
66cf9a7e | 2066 | regulator_unlock(rdev); |
5ffbd136 | 2067 | |
0630b614 | 2068 | kfree_const(regulator->supply_name); |
1768514e MB |
2069 | kfree(regulator); |
2070 | ||
414c70cb | 2071 | module_put(rdev->owner); |
23ff2f0f CK |
2072 | } |
2073 | ||
2074 | /** | |
2075 | * regulator_put - "free" the regulator source | |
2076 | * @regulator: regulator source | |
2077 | * | |
2078 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2079 | * regulator source are balanced by regulator_disable calls prior to calling | |
2080 | * this function. | |
2081 | */ | |
2082 | void regulator_put(struct regulator *regulator) | |
2083 | { | |
2084 | mutex_lock(®ulator_list_mutex); | |
2085 | _regulator_put(regulator); | |
414c70cb LG |
2086 | mutex_unlock(®ulator_list_mutex); |
2087 | } | |
2088 | EXPORT_SYMBOL_GPL(regulator_put); | |
2089 | ||
a06ccd9c CK |
2090 | /** |
2091 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2092 | * | |
2093 | * @dev: device that will be given as the regulator "consumer" | |
2094 | * @id: Supply name or regulator ID | |
2095 | * @alias_dev: device that should be used to lookup the supply | |
2096 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2097 | * supply | |
2098 | * | |
2099 | * All lookups for id on dev will instead be conducted for alias_id on | |
2100 | * alias_dev. | |
2101 | */ | |
2102 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2103 | struct device *alias_dev, | |
2104 | const char *alias_id) | |
2105 | { | |
2106 | struct regulator_supply_alias *map; | |
2107 | ||
2108 | map = regulator_find_supply_alias(dev, id); | |
2109 | if (map) | |
2110 | return -EEXIST; | |
2111 | ||
2112 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2113 | if (!map) | |
2114 | return -ENOMEM; | |
2115 | ||
2116 | map->src_dev = dev; | |
2117 | map->src_supply = id; | |
2118 | map->alias_dev = alias_dev; | |
2119 | map->alias_supply = alias_id; | |
2120 | ||
2121 | list_add(&map->list, ®ulator_supply_alias_list); | |
2122 | ||
2123 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2124 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2125 | ||
2126 | return 0; | |
2127 | } | |
2128 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2129 | ||
2130 | /** | |
2131 | * regulator_unregister_supply_alias - Remove device alias | |
2132 | * | |
2133 | * @dev: device that will be given as the regulator "consumer" | |
2134 | * @id: Supply name or regulator ID | |
2135 | * | |
2136 | * Remove a lookup alias if one exists for id on dev. | |
2137 | */ | |
2138 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2139 | { | |
2140 | struct regulator_supply_alias *map; | |
2141 | ||
2142 | map = regulator_find_supply_alias(dev, id); | |
2143 | if (map) { | |
2144 | list_del(&map->list); | |
2145 | kfree(map); | |
2146 | } | |
2147 | } | |
2148 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2149 | ||
2150 | /** | |
2151 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2152 | * | |
2153 | * @dev: device that will be given as the regulator "consumer" | |
2154 | * @id: List of supply names or regulator IDs | |
2155 | * @alias_dev: device that should be used to lookup the supply | |
2156 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2157 | * lookup the supply | |
2158 | * @num_id: Number of aliases to register | |
2159 | * | |
2160 | * @return 0 on success, an errno on failure. | |
2161 | * | |
2162 | * This helper function allows drivers to register several supply | |
2163 | * aliases in one operation. If any of the aliases cannot be | |
2164 | * registered any aliases that were registered will be removed | |
2165 | * before returning to the caller. | |
2166 | */ | |
9f8c0fe9 LJ |
2167 | int regulator_bulk_register_supply_alias(struct device *dev, |
2168 | const char *const *id, | |
a06ccd9c | 2169 | struct device *alias_dev, |
9f8c0fe9 | 2170 | const char *const *alias_id, |
a06ccd9c CK |
2171 | int num_id) |
2172 | { | |
2173 | int i; | |
2174 | int ret; | |
2175 | ||
2176 | for (i = 0; i < num_id; ++i) { | |
2177 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2178 | alias_id[i]); | |
2179 | if (ret < 0) | |
2180 | goto err; | |
2181 | } | |
2182 | ||
2183 | return 0; | |
2184 | ||
2185 | err: | |
2186 | dev_err(dev, | |
2187 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2188 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2189 | ||
2190 | while (--i >= 0) | |
2191 | regulator_unregister_supply_alias(dev, id[i]); | |
2192 | ||
2193 | return ret; | |
2194 | } | |
2195 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2196 | ||
2197 | /** | |
2198 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2199 | * | |
2200 | * @dev: device that will be given as the regulator "consumer" | |
2201 | * @id: List of supply names or regulator IDs | |
2202 | * @num_id: Number of aliases to unregister | |
2203 | * | |
2204 | * This helper function allows drivers to unregister several supply | |
2205 | * aliases in one operation. | |
2206 | */ | |
2207 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2208 | const char *const *id, |
a06ccd9c CK |
2209 | int num_id) |
2210 | { | |
2211 | int i; | |
2212 | ||
2213 | for (i = 0; i < num_id; ++i) | |
2214 | regulator_unregister_supply_alias(dev, id[i]); | |
2215 | } | |
2216 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2217 | ||
2218 | ||
f19b00da KM |
2219 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2220 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2221 | const struct regulator_config *config) | |
2222 | { | |
2223 | struct regulator_enable_gpio *pin; | |
778b28b4 | 2224 | struct gpio_desc *gpiod; |
f19b00da KM |
2225 | int ret; |
2226 | ||
e45e290a LW |
2227 | if (config->ena_gpiod) |
2228 | gpiod = config->ena_gpiod; | |
2229 | else | |
2230 | gpiod = gpio_to_desc(config->ena_gpio); | |
778b28b4 | 2231 | |
f19b00da | 2232 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2233 | if (pin->gpiod == gpiod) { |
f19b00da KM |
2234 | rdev_dbg(rdev, "GPIO %d is already used\n", |
2235 | config->ena_gpio); | |
2236 | goto update_ena_gpio_to_rdev; | |
2237 | } | |
2238 | } | |
2239 | ||
e45e290a LW |
2240 | if (!config->ena_gpiod) { |
2241 | ret = gpio_request_one(config->ena_gpio, | |
2242 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
2243 | rdev_get_name(rdev)); | |
2244 | if (ret) | |
2245 | return ret; | |
2246 | } | |
f19b00da KM |
2247 | |
2248 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
2249 | if (pin == NULL) { | |
e45e290a LW |
2250 | if (!config->ena_gpiod) |
2251 | gpio_free(config->ena_gpio); | |
f19b00da KM |
2252 | return -ENOMEM; |
2253 | } | |
2254 | ||
778b28b4 | 2255 | pin->gpiod = gpiod; |
f19b00da KM |
2256 | pin->ena_gpio_invert = config->ena_gpio_invert; |
2257 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
2258 | ||
2259 | update_ena_gpio_to_rdev: | |
2260 | pin->request_count++; | |
2261 | rdev->ena_pin = pin; | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2266 | { | |
2267 | struct regulator_enable_gpio *pin, *n; | |
2268 | ||
2269 | if (!rdev->ena_pin) | |
2270 | return; | |
2271 | ||
2272 | /* Free the GPIO only in case of no use */ | |
2273 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 2274 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
2275 | if (pin->request_count <= 1) { |
2276 | pin->request_count = 0; | |
778b28b4 | 2277 | gpiod_put(pin->gpiod); |
f19b00da KM |
2278 | list_del(&pin->list); |
2279 | kfree(pin); | |
60a2362f SWK |
2280 | rdev->ena_pin = NULL; |
2281 | return; | |
f19b00da KM |
2282 | } else { |
2283 | pin->request_count--; | |
2284 | } | |
2285 | } | |
2286 | } | |
2287 | } | |
2288 | ||
967cfb18 | 2289 | /** |
31d6eebf RD |
2290 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2291 | * @rdev: regulator_dev structure | |
2292 | * @enable: enable GPIO at initial use? | |
2293 | * | |
967cfb18 KM |
2294 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2295 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2296 | */ | |
2297 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2298 | { | |
2299 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2300 | ||
2301 | if (!pin) | |
2302 | return -EINVAL; | |
2303 | ||
2304 | if (enable) { | |
2305 | /* Enable GPIO at initial use */ | |
2306 | if (pin->enable_count == 0) | |
778b28b4 RK |
2307 | gpiod_set_value_cansleep(pin->gpiod, |
2308 | !pin->ena_gpio_invert); | |
967cfb18 KM |
2309 | |
2310 | pin->enable_count++; | |
2311 | } else { | |
2312 | if (pin->enable_count > 1) { | |
2313 | pin->enable_count--; | |
2314 | return 0; | |
2315 | } | |
2316 | ||
2317 | /* Disable GPIO if not used */ | |
2318 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
2319 | gpiod_set_value_cansleep(pin->gpiod, |
2320 | pin->ena_gpio_invert); | |
967cfb18 KM |
2321 | pin->enable_count = 0; |
2322 | } | |
2323 | } | |
2324 | ||
2325 | return 0; | |
2326 | } | |
2327 | ||
79fd1141 GX |
2328 | /** |
2329 | * _regulator_enable_delay - a delay helper function | |
2330 | * @delay: time to delay in microseconds | |
2331 | * | |
2332 | * Delay for the requested amount of time as per the guidelines in: | |
2333 | * | |
2334 | * Documentation/timers/timers-howto.txt | |
2335 | * | |
2336 | * The assumption here is that regulators will never be enabled in | |
2337 | * atomic context and therefore sleeping functions can be used. | |
2338 | */ | |
2339 | static void _regulator_enable_delay(unsigned int delay) | |
2340 | { | |
2341 | unsigned int ms = delay / 1000; | |
2342 | unsigned int us = delay % 1000; | |
2343 | ||
2344 | if (ms > 0) { | |
2345 | /* | |
2346 | * For small enough values, handle super-millisecond | |
2347 | * delays in the usleep_range() call below. | |
2348 | */ | |
2349 | if (ms < 20) | |
2350 | us += ms * 1000; | |
2351 | else | |
2352 | msleep(ms); | |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * Give the scheduler some room to coalesce with any other | |
2357 | * wakeup sources. For delays shorter than 10 us, don't even | |
2358 | * bother setting up high-resolution timers and just busy- | |
2359 | * loop. | |
2360 | */ | |
2361 | if (us >= 10) | |
2362 | usleep_range(us, us + 100); | |
2363 | else | |
2364 | udelay(us); | |
2365 | } | |
2366 | ||
5c5659d0 MB |
2367 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2368 | { | |
2369 | int ret, delay; | |
2370 | ||
2371 | /* Query before enabling in case configuration dependent. */ | |
2372 | ret = _regulator_get_enable_time(rdev); | |
2373 | if (ret >= 0) { | |
2374 | delay = ret; | |
2375 | } else { | |
2376 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2377 | delay = 0; | |
2378 | } | |
2379 | ||
2380 | trace_regulator_enable(rdev_get_name(rdev)); | |
2381 | ||
871f5650 GX |
2382 | if (rdev->desc->off_on_delay) { |
2383 | /* if needed, keep a distance of off_on_delay from last time | |
2384 | * this regulator was disabled. | |
2385 | */ | |
2386 | unsigned long start_jiffy = jiffies; | |
2387 | unsigned long intended, max_delay, remaining; | |
2388 | ||
2389 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2390 | intended = rdev->last_off_jiffy + max_delay; | |
2391 | ||
2392 | if (time_before(start_jiffy, intended)) { | |
2393 | /* calc remaining jiffies to deal with one-time | |
2394 | * timer wrapping. | |
2395 | * in case of multiple timer wrapping, either it can be | |
2396 | * detected by out-of-range remaining, or it cannot be | |
2397 | * detected and we gets a panelty of | |
2398 | * _regulator_enable_delay(). | |
2399 | */ | |
2400 | remaining = intended - start_jiffy; | |
2401 | if (remaining <= max_delay) | |
2402 | _regulator_enable_delay( | |
2403 | jiffies_to_usecs(remaining)); | |
2404 | } | |
2405 | } | |
2406 | ||
967cfb18 | 2407 | if (rdev->ena_pin) { |
29d62ec5 DA |
2408 | if (!rdev->ena_gpio_state) { |
2409 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2410 | if (ret < 0) | |
2411 | return ret; | |
2412 | rdev->ena_gpio_state = 1; | |
2413 | } | |
65f73508 | 2414 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2415 | ret = rdev->desc->ops->enable(rdev); |
2416 | if (ret < 0) | |
2417 | return ret; | |
2418 | } else { | |
2419 | return -EINVAL; | |
2420 | } | |
2421 | ||
2422 | /* Allow the regulator to ramp; it would be useful to extend | |
2423 | * this for bulk operations so that the regulators can ramp | |
2424 | * together. */ | |
2425 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2426 | ||
79fd1141 | 2427 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2428 | |
2429 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2430 | ||
2431 | return 0; | |
2432 | } | |
2433 | ||
5451781d DA |
2434 | /** |
2435 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2436 | * @regulator: regulator source | |
2437 | * | |
2438 | * Some things on a regulator consumer (like the contribution towards total | |
2439 | * load on the regulator) only have an effect when the consumer wants the | |
2440 | * regulator enabled. Explained in example with two consumers of the same | |
2441 | * regulator: | |
2442 | * consumer A: set_load(100); => total load = 0 | |
2443 | * consumer A: regulator_enable(); => total load = 100 | |
2444 | * consumer B: set_load(1000); => total load = 100 | |
2445 | * consumer B: regulator_enable(); => total load = 1100 | |
2446 | * consumer A: regulator_disable(); => total_load = 1000 | |
2447 | * | |
2448 | * This function (together with _regulator_handle_consumer_disable) is | |
2449 | * responsible for keeping track of the refcount for a given regulator consumer | |
2450 | * and applying / unapplying these things. | |
2451 | * | |
2452 | * Returns 0 upon no error; -error upon error. | |
2453 | */ | |
2454 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2455 | { | |
2456 | struct regulator_dev *rdev = regulator->rdev; | |
2457 | ||
2458 | lockdep_assert_held_once(&rdev->mutex.base); | |
2459 | ||
2460 | regulator->enable_count++; | |
2461 | if (regulator->uA_load && regulator->enable_count == 1) | |
2462 | return drms_uA_update(rdev); | |
2463 | ||
2464 | return 0; | |
2465 | } | |
2466 | ||
2467 | /** | |
2468 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2469 | * @regulator: regulator source | |
2470 | * | |
2471 | * The opposite of _regulator_handle_consumer_enable(). | |
2472 | * | |
2473 | * Returns 0 upon no error; -error upon error. | |
2474 | */ | |
2475 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2476 | { | |
2477 | struct regulator_dev *rdev = regulator->rdev; | |
2478 | ||
2479 | lockdep_assert_held_once(&rdev->mutex.base); | |
2480 | ||
2481 | if (!regulator->enable_count) { | |
2482 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2483 | return -EINVAL; | |
2484 | } | |
2485 | ||
2486 | regulator->enable_count--; | |
2487 | if (regulator->uA_load && regulator->enable_count == 0) | |
2488 | return drms_uA_update(rdev); | |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
414c70cb | 2493 | /* locks held by regulator_enable() */ |
5451781d | 2494 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2495 | { |
5451781d | 2496 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2497 | int ret; |
414c70cb | 2498 | |
f8702f9e DO |
2499 | lockdep_assert_held_once(&rdev->mutex.base); |
2500 | ||
1fc12b05 | 2501 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2502 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2503 | if (ret < 0) |
2504 | return ret; | |
2505 | } | |
2506 | ||
2507 | /* balance only if there are regulators coupled */ | |
2508 | if (rdev->coupling_desc.n_coupled > 1) { | |
2509 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2510 | if (ret < 0) | |
2511 | goto err_disable_supply; | |
2512 | } | |
70cfef26 | 2513 | |
5451781d DA |
2514 | ret = _regulator_handle_consumer_enable(regulator); |
2515 | if (ret < 0) | |
2516 | goto err_disable_supply; | |
414c70cb | 2517 | |
9a2372fa MB |
2518 | if (rdev->use_count == 0) { |
2519 | /* The regulator may on if it's not switchable or left on */ | |
2520 | ret = _regulator_is_enabled(rdev); | |
2521 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2522 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2523 | REGULATOR_CHANGE_STATUS)) { |
2524 | ret = -EPERM; | |
5451781d | 2525 | goto err_consumer_disable; |
f8702f9e | 2526 | } |
9a2372fa | 2527 | |
5c5659d0 | 2528 | ret = _regulator_do_enable(rdev); |
31aae2be | 2529 | if (ret < 0) |
5451781d | 2530 | goto err_consumer_disable; |
31aae2be | 2531 | |
264b88c9 HG |
2532 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2533 | NULL); | |
a7433cff | 2534 | } else if (ret < 0) { |
5da84fd9 | 2535 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
5451781d | 2536 | goto err_consumer_disable; |
414c70cb | 2537 | } |
a7433cff | 2538 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2539 | } |
2540 | ||
9a2372fa MB |
2541 | rdev->use_count++; |
2542 | ||
2543 | return 0; | |
f8702f9e | 2544 | |
5451781d DA |
2545 | err_consumer_disable: |
2546 | _regulator_handle_consumer_disable(regulator); | |
2547 | ||
f8702f9e | 2548 | err_disable_supply: |
1fc12b05 | 2549 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2550 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2551 | |
2552 | return ret; | |
414c70cb LG |
2553 | } |
2554 | ||
2555 | /** | |
2556 | * regulator_enable - enable regulator output | |
2557 | * @regulator: regulator source | |
2558 | * | |
cf7bbcdf MB |
2559 | * Request that the regulator be enabled with the regulator output at |
2560 | * the predefined voltage or current value. Calls to regulator_enable() | |
2561 | * must be balanced with calls to regulator_disable(). | |
2562 | * | |
414c70cb | 2563 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2564 | * hardwired in the regulator. |
414c70cb LG |
2565 | */ |
2566 | int regulator_enable(struct regulator *regulator) | |
2567 | { | |
412aec61 | 2568 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2569 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2570 | int ret; |
6492bc1b | 2571 | |
f8702f9e | 2572 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2573 | ret = _regulator_enable(regulator); |
f8702f9e | 2574 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2575 | |
414c70cb LG |
2576 | return ret; |
2577 | } | |
2578 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2579 | ||
5c5659d0 MB |
2580 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2581 | { | |
2582 | int ret; | |
2583 | ||
2584 | trace_regulator_disable(rdev_get_name(rdev)); | |
2585 | ||
967cfb18 | 2586 | if (rdev->ena_pin) { |
29d62ec5 DA |
2587 | if (rdev->ena_gpio_state) { |
2588 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2589 | if (ret < 0) | |
2590 | return ret; | |
2591 | rdev->ena_gpio_state = 0; | |
2592 | } | |
5c5659d0 MB |
2593 | |
2594 | } else if (rdev->desc->ops->disable) { | |
2595 | ret = rdev->desc->ops->disable(rdev); | |
2596 | if (ret != 0) | |
2597 | return ret; | |
2598 | } | |
2599 | ||
871f5650 GX |
2600 | /* cares about last_off_jiffy only if off_on_delay is required by |
2601 | * device. | |
2602 | */ | |
2603 | if (rdev->desc->off_on_delay) | |
2604 | rdev->last_off_jiffy = jiffies; | |
2605 | ||
5c5659d0 MB |
2606 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2607 | ||
5c5659d0 MB |
2608 | return 0; |
2609 | } | |
2610 | ||
414c70cb | 2611 | /* locks held by regulator_disable() */ |
5451781d | 2612 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2613 | { |
5451781d | 2614 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2615 | int ret = 0; |
2616 | ||
f8702f9e | 2617 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2618 | |
cd94b505 | 2619 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2620 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2621 | return -EIO; |
2622 | ||
414c70cb | 2623 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2624 | if (rdev->use_count == 1 && |
2625 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2626 | |
2627 | /* we are last user */ | |
8a34e979 | 2628 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2629 | ret = _notifier_call_chain(rdev, |
2630 | REGULATOR_EVENT_PRE_DISABLE, | |
2631 | NULL); | |
2632 | if (ret & NOTIFY_STOP_MASK) | |
2633 | return -EINVAL; | |
2634 | ||
5c5659d0 | 2635 | ret = _regulator_do_disable(rdev); |
414c70cb | 2636 | if (ret < 0) { |
5da84fd9 | 2637 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2638 | _notifier_call_chain(rdev, |
2639 | REGULATOR_EVENT_ABORT_DISABLE, | |
2640 | NULL); | |
414c70cb LG |
2641 | return ret; |
2642 | } | |
66fda75f MP |
2643 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2644 | NULL); | |
414c70cb LG |
2645 | } |
2646 | ||
414c70cb LG |
2647 | rdev->use_count = 0; |
2648 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2649 | rdev->use_count--; |
2650 | } | |
3801b86a | 2651 | |
5451781d DA |
2652 | if (ret == 0) |
2653 | ret = _regulator_handle_consumer_disable(regulator); | |
2654 | ||
f8702f9e DO |
2655 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2656 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2657 | ||
1fc12b05 | 2658 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2659 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2660 | |
414c70cb LG |
2661 | return ret; |
2662 | } | |
2663 | ||
2664 | /** | |
2665 | * regulator_disable - disable regulator output | |
2666 | * @regulator: regulator source | |
2667 | * | |
cf7bbcdf MB |
2668 | * Disable the regulator output voltage or current. Calls to |
2669 | * regulator_enable() must be balanced with calls to | |
2670 | * regulator_disable(). | |
69279fb9 | 2671 | * |
414c70cb | 2672 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2673 | * devices have it enabled, the regulator device supports disabling and |
2674 | * machine constraints permit this operation. | |
414c70cb LG |
2675 | */ |
2676 | int regulator_disable(struct regulator *regulator) | |
2677 | { | |
412aec61 | 2678 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2679 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2680 | int ret; |
6492bc1b | 2681 | |
f8702f9e | 2682 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2683 | ret = _regulator_disable(regulator); |
f8702f9e | 2684 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2685 | |
414c70cb LG |
2686 | return ret; |
2687 | } | |
2688 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2689 | ||
2690 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2691 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2692 | { |
2693 | int ret = 0; | |
2694 | ||
f8702f9e | 2695 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2696 | |
a1c8a551 RF |
2697 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2698 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2699 | if (ret & NOTIFY_STOP_MASK) | |
2700 | return -EINVAL; | |
2701 | ||
66fda75f MP |
2702 | ret = _regulator_do_disable(rdev); |
2703 | if (ret < 0) { | |
2704 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2705 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2706 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2707 | return ret; |
414c70cb LG |
2708 | } |
2709 | ||
66fda75f MP |
2710 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2711 | REGULATOR_EVENT_DISABLE, NULL); | |
2712 | ||
2713 | return 0; | |
414c70cb LG |
2714 | } |
2715 | ||
2716 | /** | |
2717 | * regulator_force_disable - force disable regulator output | |
2718 | * @regulator: regulator source | |
2719 | * | |
2720 | * Forcibly disable the regulator output voltage or current. | |
2721 | * NOTE: this *will* disable the regulator output even if other consumer | |
2722 | * devices have it enabled. This should be used for situations when device | |
2723 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2724 | */ | |
2725 | int regulator_force_disable(struct regulator *regulator) | |
2726 | { | |
82d15839 | 2727 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2728 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2729 | int ret; |
2730 | ||
f8702f9e | 2731 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2732 | |
3801b86a | 2733 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2734 | |
9243a195 MP |
2735 | if (rdev->coupling_desc.n_coupled > 1) |
2736 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2737 | |
2738 | if (regulator->uA_load) { | |
2739 | regulator->uA_load = 0; | |
2740 | ret = drms_uA_update(rdev); | |
2741 | } | |
2742 | ||
1fc12b05 DA |
2743 | if (rdev->use_count != 0 && rdev->supply) |
2744 | _regulator_disable(rdev->supply); | |
8cbf811d | 2745 | |
1fc12b05 | 2746 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2747 | |
414c70cb LG |
2748 | return ret; |
2749 | } | |
2750 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2751 | ||
da07ecd9 MB |
2752 | static void regulator_disable_work(struct work_struct *work) |
2753 | { | |
2754 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2755 | disable_work.work); | |
f8702f9e | 2756 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2757 | int count, i, ret; |
5451781d DA |
2758 | struct regulator *regulator; |
2759 | int total_count = 0; | |
da07ecd9 | 2760 | |
f8702f9e | 2761 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2762 | |
c9ccaa0c TR |
2763 | /* |
2764 | * Workqueue functions queue the new work instance while the previous | |
2765 | * work instance is being processed. Cancel the queued work instance | |
2766 | * as the work instance under processing does the job of the queued | |
2767 | * work instance. | |
2768 | */ | |
2769 | cancel_delayed_work(&rdev->disable_work); | |
2770 | ||
5451781d DA |
2771 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2772 | count = regulator->deferred_disables; | |
2773 | ||
2774 | if (!count) | |
2775 | continue; | |
2776 | ||
2777 | total_count += count; | |
2778 | regulator->deferred_disables = 0; | |
2779 | ||
2780 | for (i = 0; i < count; i++) { | |
2781 | ret = _regulator_disable(regulator); | |
2782 | if (ret != 0) | |
2783 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2784 | } | |
da07ecd9 | 2785 | } |
5451781d | 2786 | WARN_ON(!total_count); |
da07ecd9 | 2787 | |
f8702f9e DO |
2788 | if (rdev->coupling_desc.n_coupled > 1) |
2789 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2790 | ||
2791 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2792 | |
2793 | if (rdev->supply) { | |
2794 | for (i = 0; i < count; i++) { | |
2795 | ret = regulator_disable(rdev->supply); | |
2796 | if (ret != 0) { | |
2797 | rdev_err(rdev, | |
2798 | "Supply disable failed: %d\n", ret); | |
2799 | } | |
2800 | } | |
2801 | } | |
2802 | } | |
2803 | ||
2804 | /** | |
2805 | * regulator_disable_deferred - disable regulator output with delay | |
2806 | * @regulator: regulator source | |
2807 | * @ms: miliseconds until the regulator is disabled | |
2808 | * | |
2809 | * Execute regulator_disable() on the regulator after a delay. This | |
2810 | * is intended for use with devices that require some time to quiesce. | |
2811 | * | |
2812 | * NOTE: this will only disable the regulator output if no other consumer | |
2813 | * devices have it enabled, the regulator device supports disabling and | |
2814 | * machine constraints permit this operation. | |
2815 | */ | |
2816 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2817 | { | |
2818 | struct regulator_dev *rdev = regulator->rdev; | |
2819 | ||
2b5a24a0 MB |
2820 | if (!ms) |
2821 | return regulator_disable(regulator); | |
2822 | ||
66cf9a7e | 2823 | regulator_lock(rdev); |
5451781d | 2824 | regulator->deferred_disables++; |
c9ccaa0c TR |
2825 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2826 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2827 | regulator_unlock(rdev); |
da07ecd9 | 2828 | |
70dc6daf | 2829 | return 0; |
da07ecd9 MB |
2830 | } |
2831 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2832 | ||
414c70cb LG |
2833 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2834 | { | |
65f73508 | 2835 | /* A GPIO control always takes precedence */ |
7b74d149 | 2836 | if (rdev->ena_pin) |
65f73508 MB |
2837 | return rdev->ena_gpio_state; |
2838 | ||
9a7f6a4c | 2839 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2840 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2841 | return 1; |
414c70cb | 2842 | |
9332546f | 2843 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2844 | } |
2845 | ||
3d67fe95 MP |
2846 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2847 | unsigned selector, int lock) | |
3a40cfc3 | 2848 | { |
3a40cfc3 SH |
2849 | const struct regulator_ops *ops = rdev->desc->ops; |
2850 | int ret; | |
2851 | ||
2852 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2853 | return rdev->desc->fixed_uV; | |
2854 | ||
2855 | if (ops->list_voltage) { | |
2856 | if (selector >= rdev->desc->n_voltages) | |
2857 | return -EINVAL; | |
2858 | if (lock) | |
66cf9a7e | 2859 | regulator_lock(rdev); |
3a40cfc3 SH |
2860 | ret = ops->list_voltage(rdev, selector); |
2861 | if (lock) | |
66cf9a7e | 2862 | regulator_unlock(rdev); |
fd086045 | 2863 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2864 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2865 | selector, lock); | |
3a40cfc3 SH |
2866 | } else { |
2867 | return -EINVAL; | |
2868 | } | |
2869 | ||
2870 | if (ret > 0) { | |
2871 | if (ret < rdev->constraints->min_uV) | |
2872 | ret = 0; | |
2873 | else if (ret > rdev->constraints->max_uV) | |
2874 | ret = 0; | |
2875 | } | |
2876 | ||
2877 | return ret; | |
2878 | } | |
2879 | ||
414c70cb LG |
2880 | /** |
2881 | * regulator_is_enabled - is the regulator output enabled | |
2882 | * @regulator: regulator source | |
2883 | * | |
412aec61 DB |
2884 | * Returns positive if the regulator driver backing the source/client |
2885 | * has requested that the device be enabled, zero if it hasn't, else a | |
2886 | * negative errno code. | |
2887 | * | |
2888 | * Note that the device backing this regulator handle can have multiple | |
2889 | * users, so it might be enabled even if regulator_enable() was never | |
2890 | * called for this particular source. | |
414c70cb LG |
2891 | */ |
2892 | int regulator_is_enabled(struct regulator *regulator) | |
2893 | { | |
9332546f MB |
2894 | int ret; |
2895 | ||
6492bc1b MB |
2896 | if (regulator->always_on) |
2897 | return 1; | |
2898 | ||
f8702f9e | 2899 | regulator_lock(regulator->rdev); |
9332546f | 2900 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 2901 | regulator_unlock(regulator->rdev); |
9332546f MB |
2902 | |
2903 | return ret; | |
414c70cb LG |
2904 | } |
2905 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2906 | ||
4367cfdc DB |
2907 | /** |
2908 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2909 | * @regulator: regulator source | |
2910 | * | |
2911 | * Returns number of selectors, or negative errno. Selectors are | |
2912 | * numbered starting at zero, and typically correspond to bitfields | |
2913 | * in hardware registers. | |
2914 | */ | |
2915 | int regulator_count_voltages(struct regulator *regulator) | |
2916 | { | |
2917 | struct regulator_dev *rdev = regulator->rdev; | |
2918 | ||
26988efe JMC |
2919 | if (rdev->desc->n_voltages) |
2920 | return rdev->desc->n_voltages; | |
2921 | ||
fd086045 | 2922 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
2923 | return -EINVAL; |
2924 | ||
2925 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2926 | } |
2927 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2928 | ||
2929 | /** | |
2930 | * regulator_list_voltage - enumerate supported voltages | |
2931 | * @regulator: regulator source | |
2932 | * @selector: identify voltage to list | |
2933 | * Context: can sleep | |
2934 | * | |
2935 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2936 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2937 | * negative errno. |
2938 | */ | |
2939 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2940 | { | |
3d67fe95 | 2941 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
2942 | } |
2943 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2944 | ||
04eca28c TT |
2945 | /** |
2946 | * regulator_get_regmap - get the regulator's register map | |
2947 | * @regulator: regulator source | |
2948 | * | |
2949 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2950 | * if the regulator doesn't use regmap. | |
2951 | */ | |
2952 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2953 | { | |
2954 | struct regmap *map = regulator->rdev->regmap; | |
2955 | ||
2956 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2957 | } | |
2958 | ||
2959 | /** | |
2960 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2961 | * @regulator: regulator source | |
2962 | * @vsel_reg: voltage selector register, output parameter | |
2963 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2964 | * | |
2965 | * Returns the hardware register offset and bitmask used for setting the | |
2966 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2967 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2968 | * for example. | |
2969 | * | |
2970 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2971 | * and 0 is returned, otherwise a negative errno is returned. | |
2972 | */ | |
2973 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2974 | unsigned *vsel_reg, | |
2975 | unsigned *vsel_mask) | |
2976 | { | |
39f5460d GX |
2977 | struct regulator_dev *rdev = regulator->rdev; |
2978 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2979 | |
2980 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2981 | return -EOPNOTSUPP; | |
2982 | ||
0d5c8633 CIK |
2983 | *vsel_reg = rdev->desc->vsel_reg; |
2984 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c TT |
2985 | |
2986 | return 0; | |
2987 | } | |
2988 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2989 | ||
2990 | /** | |
2991 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2992 | * @regulator: regulator source | |
2993 | * @selector: identify voltage to list | |
2994 | * | |
2995 | * Converts the selector to a hardware-specific voltage selector that can be | |
2996 | * directly written to the regulator registers. The address of the voltage | |
2997 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2998 | * | |
2999 | * On error a negative errno is returned. | |
3000 | */ | |
3001 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3002 | unsigned selector) | |
3003 | { | |
39f5460d GX |
3004 | struct regulator_dev *rdev = regulator->rdev; |
3005 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3006 | |
3007 | if (selector >= rdev->desc->n_voltages) | |
3008 | return -EINVAL; | |
3009 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3010 | return -EOPNOTSUPP; | |
3011 | ||
3012 | return selector; | |
3013 | } | |
3014 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3015 | ||
2a668a8b PW |
3016 | /** |
3017 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3018 | * @regulator: regulator source | |
3019 | * | |
3020 | * Returns the voltage step size between VSEL values for linear | |
3021 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3022 | */ | |
3023 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3024 | { | |
3025 | struct regulator_dev *rdev = regulator->rdev; | |
3026 | ||
3027 | return rdev->desc->uV_step; | |
3028 | } | |
3029 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3030 | ||
a7a1ad90 MB |
3031 | /** |
3032 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3033 | * | |
3034 | * @regulator: Regulator to check. | |
3035 | * @min_uV: Minimum required voltage in uV. | |
3036 | * @max_uV: Maximum required voltage in uV. | |
3037 | * | |
3038 | * Returns a boolean or a negative error code. | |
3039 | */ | |
3040 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3041 | int min_uV, int max_uV) | |
3042 | { | |
c5f3939b | 3043 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3044 | int i, voltages, ret; |
3045 | ||
c5f3939b | 3046 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3047 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3048 | ret = regulator_get_voltage(regulator); |
3049 | if (ret >= 0) | |
0d25d09d | 3050 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3051 | else |
3052 | return ret; | |
3053 | } | |
3054 | ||
bd7a2b60 PM |
3055 | /* Any voltage within constrains range is fine? */ |
3056 | if (rdev->desc->continuous_voltage_range) | |
3057 | return min_uV >= rdev->constraints->min_uV && | |
3058 | max_uV <= rdev->constraints->max_uV; | |
3059 | ||
a7a1ad90 MB |
3060 | ret = regulator_count_voltages(regulator); |
3061 | if (ret < 0) | |
3062 | return ret; | |
3063 | voltages = ret; | |
3064 | ||
3065 | for (i = 0; i < voltages; i++) { | |
3066 | ret = regulator_list_voltage(regulator, i); | |
3067 | ||
3068 | if (ret >= min_uV && ret <= max_uV) | |
3069 | return 1; | |
3070 | } | |
3071 | ||
3072 | return 0; | |
3073 | } | |
a398eaa2 | 3074 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3075 | |
a204f41e SH |
3076 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3077 | int max_uV) | |
3078 | { | |
3079 | const struct regulator_desc *desc = rdev->desc; | |
3080 | ||
3081 | if (desc->ops->map_voltage) | |
3082 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3083 | ||
3084 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3085 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3086 | ||
3087 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3088 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3089 | ||
18e4b55f MV |
3090 | if (desc->ops->list_voltage == |
3091 | regulator_list_voltage_pickable_linear_range) | |
3092 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3093 | min_uV, max_uV); | |
3094 | ||
a204f41e SH |
3095 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3096 | } | |
3097 | ||
7179569a HS |
3098 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3099 | int min_uV, int max_uV, | |
3100 | unsigned *selector) | |
3101 | { | |
3102 | struct pre_voltage_change_data data; | |
3103 | int ret; | |
3104 | ||
3105 | data.old_uV = _regulator_get_voltage(rdev); | |
3106 | data.min_uV = min_uV; | |
3107 | data.max_uV = max_uV; | |
3108 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3109 | &data); | |
3110 | if (ret & NOTIFY_STOP_MASK) | |
3111 | return -EINVAL; | |
3112 | ||
3113 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3114 | if (ret >= 0) | |
3115 | return ret; | |
3116 | ||
3117 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3118 | (void *)data.old_uV); | |
3119 | ||
3120 | return ret; | |
3121 | } | |
3122 | ||
3123 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3124 | int uV, unsigned selector) | |
3125 | { | |
3126 | struct pre_voltage_change_data data; | |
3127 | int ret; | |
3128 | ||
3129 | data.old_uV = _regulator_get_voltage(rdev); | |
3130 | data.min_uV = uV; | |
3131 | data.max_uV = uV; | |
3132 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3133 | &data); | |
3134 | if (ret & NOTIFY_STOP_MASK) | |
3135 | return -EINVAL; | |
3136 | ||
3137 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3138 | if (ret >= 0) | |
3139 | return ret; | |
3140 | ||
3141 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3142 | (void *)data.old_uV); | |
3143 | ||
3144 | return ret; | |
3145 | } | |
3146 | ||
73e705bf MK |
3147 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3148 | int old_uV, int new_uV) | |
3149 | { | |
3150 | unsigned int ramp_delay = 0; | |
3151 | ||
3152 | if (rdev->constraints->ramp_delay) | |
3153 | ramp_delay = rdev->constraints->ramp_delay; | |
3154 | else if (rdev->desc->ramp_delay) | |
3155 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3156 | else if (rdev->constraints->settling_time) |
3157 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3158 | else if (rdev->constraints->settling_time_up && |
3159 | (new_uV > old_uV)) | |
3160 | return rdev->constraints->settling_time_up; | |
3161 | else if (rdev->constraints->settling_time_down && | |
3162 | (new_uV < old_uV)) | |
3163 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3164 | |
3165 | if (ramp_delay == 0) { | |
ba14fa1a | 3166 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3167 | return 0; |
3168 | } | |
3169 | ||
3170 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3171 | } | |
3172 | ||
75790251 MB |
3173 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3174 | int min_uV, int max_uV) | |
3175 | { | |
3176 | int ret; | |
77af1b26 | 3177 | int delay = 0; |
e113d792 | 3178 | int best_val = 0; |
75790251 | 3179 | unsigned int selector; |
eba41a5e | 3180 | int old_selector = -1; |
57995a48 | 3181 | const struct regulator_ops *ops = rdev->desc->ops; |
73e705bf | 3182 | int old_uV = _regulator_get_voltage(rdev); |
75790251 MB |
3183 | |
3184 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3185 | ||
bf5892a8 MB |
3186 | min_uV += rdev->constraints->uV_offset; |
3187 | max_uV += rdev->constraints->uV_offset; | |
3188 | ||
eba41a5e AL |
3189 | /* |
3190 | * If we can't obtain the old selector there is not enough | |
3191 | * info to call set_voltage_time_sel(). | |
3192 | */ | |
8b7485ef | 3193 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3194 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3195 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3196 | if (old_selector < 0) |
3197 | return old_selector; | |
3198 | } | |
3199 | ||
57995a48 | 3200 | if (ops->set_voltage) { |
7179569a HS |
3201 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3202 | &selector); | |
e113d792 MB |
3203 | |
3204 | if (ret >= 0) { | |
57995a48 MK |
3205 | if (ops->list_voltage) |
3206 | best_val = ops->list_voltage(rdev, | |
3207 | selector); | |
e113d792 MB |
3208 | else |
3209 | best_val = _regulator_get_voltage(rdev); | |
3210 | } | |
3211 | ||
57995a48 | 3212 | } else if (ops->set_voltage_sel) { |
a204f41e | 3213 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3214 | if (ret >= 0) { |
57995a48 | 3215 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3216 | if (min_uV <= best_val && max_uV >= best_val) { |
3217 | selector = ret; | |
c66a566a AL |
3218 | if (old_selector == selector) |
3219 | ret = 0; | |
3220 | else | |
7179569a HS |
3221 | ret = _regulator_call_set_voltage_sel( |
3222 | rdev, best_val, selector); | |
e113d792 MB |
3223 | } else { |
3224 | ret = -EINVAL; | |
3225 | } | |
e8eef82b | 3226 | } |
75790251 MB |
3227 | } else { |
3228 | ret = -EINVAL; | |
3229 | } | |
e8eef82b | 3230 | |
31dfe686 MK |
3231 | if (ret) |
3232 | goto out; | |
77af1b26 | 3233 | |
73e705bf MK |
3234 | if (ops->set_voltage_time_sel) { |
3235 | /* | |
3236 | * Call set_voltage_time_sel if successfully obtained | |
3237 | * old_selector | |
3238 | */ | |
3239 | if (old_selector >= 0 && old_selector != selector) | |
3240 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3241 | selector); | |
3242 | } else { | |
3243 | if (old_uV != best_val) { | |
3244 | if (ops->set_voltage_time) | |
3245 | delay = ops->set_voltage_time(rdev, old_uV, | |
3246 | best_val); | |
3247 | else | |
3248 | delay = _regulator_set_voltage_time(rdev, | |
3249 | old_uV, | |
3250 | best_val); | |
e8eef82b | 3251 | } |
73e705bf | 3252 | } |
75790251 | 3253 | |
73e705bf MK |
3254 | if (delay < 0) { |
3255 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
3256 | delay = 0; | |
77af1b26 LW |
3257 | } |
3258 | ||
73e705bf MK |
3259 | /* Insert any necessary delays */ |
3260 | if (delay >= 1000) { | |
3261 | mdelay(delay / 1000); | |
3262 | udelay(delay % 1000); | |
3263 | } else if (delay) { | |
3264 | udelay(delay); | |
77af1b26 LW |
3265 | } |
3266 | ||
31dfe686 | 3267 | if (best_val >= 0) { |
2f6c797f AL |
3268 | unsigned long data = best_val; |
3269 | ||
ded06a52 | 3270 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3271 | (void *)data); |
3272 | } | |
ded06a52 | 3273 | |
31dfe686 | 3274 | out: |
eba41a5e | 3275 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3276 | |
3277 | return ret; | |
3278 | } | |
3279 | ||
f7efad10 CZ |
3280 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3281 | int min_uV, int max_uV, suspend_state_t state) | |
3282 | { | |
3283 | struct regulator_state *rstate; | |
3284 | int uV, sel; | |
3285 | ||
3286 | rstate = regulator_get_suspend_state(rdev, state); | |
3287 | if (rstate == NULL) | |
3288 | return -EINVAL; | |
3289 | ||
3290 | if (min_uV < rstate->min_uV) | |
3291 | min_uV = rstate->min_uV; | |
3292 | if (max_uV > rstate->max_uV) | |
3293 | max_uV = rstate->max_uV; | |
3294 | ||
3295 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3296 | if (sel < 0) | |
3297 | return sel; | |
3298 | ||
3299 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3300 | if (uV >= min_uV && uV <= max_uV) | |
3301 | rstate->uV = uV; | |
3302 | ||
3303 | return 0; | |
3304 | } | |
3305 | ||
a9f226bc | 3306 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3307 | int min_uV, int max_uV, |
3308 | suspend_state_t state) | |
414c70cb LG |
3309 | { |
3310 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3311 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3312 | int ret = 0; |
92d7a558 | 3313 | int old_min_uV, old_max_uV; |
c00dc359 | 3314 | int current_uV; |
414c70cb | 3315 | |
95a3c23a MB |
3316 | /* If we're setting the same range as last time the change |
3317 | * should be a noop (some cpufreq implementations use the same | |
3318 | * voltage for multiple frequencies, for example). | |
3319 | */ | |
c360a6df | 3320 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3321 | goto out; |
3322 | ||
c00dc359 | 3323 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3324 | * return successfully even though the regulator does not support |
c00dc359 BA |
3325 | * changing the voltage. |
3326 | */ | |
8a34e979 | 3327 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c00dc359 BA |
3328 | current_uV = _regulator_get_voltage(rdev); |
3329 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
c360a6df CZ |
3330 | voltage->min_uV = min_uV; |
3331 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3332 | goto out; |
3333 | } | |
3334 | } | |
3335 | ||
414c70cb | 3336 | /* sanity check */ |
e8eef82b MB |
3337 | if (!rdev->desc->ops->set_voltage && |
3338 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3339 | ret = -EINVAL; |
3340 | goto out; | |
3341 | } | |
3342 | ||
3343 | /* constraints check */ | |
3344 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3345 | if (ret < 0) | |
3346 | goto out; | |
0d25d09d | 3347 | |
92d7a558 | 3348 | /* restore original values in case of error */ |
c360a6df CZ |
3349 | old_min_uV = voltage->min_uV; |
3350 | old_max_uV = voltage->max_uV; | |
3351 | voltage->min_uV = min_uV; | |
3352 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3353 | |
9243a195 MP |
3354 | /* for not coupled regulators this will just set the voltage */ |
3355 | ret = regulator_balance_voltage(rdev, state); | |
05fda3b1 | 3356 | if (ret < 0) |
92d7a558 | 3357 | goto out2; |
05fda3b1 | 3358 | |
9243a195 MP |
3359 | out: |
3360 | return 0; | |
3361 | out2: | |
3362 | voltage->min_uV = old_min_uV; | |
3363 | voltage->max_uV = old_max_uV; | |
3364 | ||
3365 | return ret; | |
3366 | } | |
3367 | ||
3368 | static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, | |
3369 | int max_uV, suspend_state_t state) | |
3370 | { | |
3371 | int best_supply_uV = 0; | |
3372 | int supply_change_uV = 0; | |
3373 | int ret; | |
3374 | ||
43fc99f2 MB |
3375 | if (rdev->supply && |
3376 | regulator_ops_is_valid(rdev->supply->rdev, | |
3377 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3378 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3379 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3380 | int current_supply_uV; |
3381 | int selector; | |
3382 | ||
3383 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3384 | if (selector < 0) { | |
3385 | ret = selector; | |
9243a195 | 3386 | goto out; |
fc42112c SH |
3387 | } |
3388 | ||
00cb9f4f | 3389 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3390 | if (best_supply_uV < 0) { |
3391 | ret = best_supply_uV; | |
9243a195 | 3392 | goto out; |
fc42112c SH |
3393 | } |
3394 | ||
3395 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3396 | ||
3397 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
3398 | if (current_supply_uV < 0) { | |
3399 | ret = current_supply_uV; | |
9243a195 | 3400 | goto out; |
fc42112c SH |
3401 | } |
3402 | ||
3403 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3404 | } | |
3405 | ||
3406 | if (supply_change_uV > 0) { | |
3407 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3408 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3409 | if (ret) { |
3410 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3411 | ret); | |
9243a195 | 3412 | goto out; |
fc42112c SH |
3413 | } |
3414 | } | |
3415 | ||
f7efad10 CZ |
3416 | if (state == PM_SUSPEND_ON) |
3417 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3418 | else | |
3419 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3420 | max_uV, state); | |
92d7a558 | 3421 | if (ret < 0) |
9243a195 | 3422 | goto out; |
0d25d09d | 3423 | |
fc42112c SH |
3424 | if (supply_change_uV < 0) { |
3425 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3426 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3427 | if (ret) |
3428 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3429 | ret); | |
3430 | /* No need to fail here */ | |
3431 | ret = 0; | |
3432 | } | |
3433 | ||
414c70cb | 3434 | out: |
a9f226bc | 3435 | return ret; |
69686176 MP |
3436 | } |
3437 | ||
85254bcf DO |
3438 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3439 | int *current_uV, int *min_uV) | |
3440 | { | |
3441 | struct regulation_constraints *constraints = rdev->constraints; | |
3442 | ||
3443 | /* Limit voltage change only if necessary */ | |
3444 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3445 | return 1; | |
3446 | ||
3447 | if (*current_uV < 0) { | |
3448 | *current_uV = _regulator_get_voltage(rdev); | |
3449 | ||
3450 | if (*current_uV < 0) | |
3451 | return *current_uV; | |
3452 | } | |
3453 | ||
3454 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3455 | return 1; | |
3456 | ||
3457 | /* Clamp target voltage within the given step */ | |
3458 | if (*current_uV < *min_uV) | |
3459 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3460 | *min_uV); | |
3461 | else | |
3462 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3463 | *min_uV); | |
3464 | ||
3465 | return 0; | |
3466 | } | |
3467 | ||
c054c6c7 MP |
3468 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3469 | int *current_uV, | |
3470 | int *min_uV, int *max_uV, | |
3471 | suspend_state_t state, | |
3472 | int n_coupled) | |
3473 | { | |
3474 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3475 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3476 | struct regulation_constraints *constraints = rdev->constraints; | |
3477 | int max_spread = constraints->max_spread; | |
3478 | int desired_min_uV = 0, desired_max_uV = INT_MAX; | |
3479 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3480 | int highest_min_uV = 0, target_uV, possible_uV; | |
3481 | int i, ret; | |
3482 | bool done; | |
3483 | ||
3484 | *current_uV = -1; | |
3485 | ||
3486 | /* | |
3487 | * If there are no coupled regulators, simply set the voltage | |
3488 | * demanded by consumers. | |
3489 | */ | |
3490 | if (n_coupled == 1) { | |
3491 | /* | |
3492 | * If consumers don't provide any demands, set voltage | |
3493 | * to min_uV | |
3494 | */ | |
3495 | desired_min_uV = constraints->min_uV; | |
3496 | desired_max_uV = constraints->max_uV; | |
3497 | ||
3498 | ret = regulator_check_consumers(rdev, | |
3499 | &desired_min_uV, | |
3500 | &desired_max_uV, state); | |
3501 | if (ret < 0) | |
3502 | return ret; | |
3503 | ||
3504 | possible_uV = desired_min_uV; | |
3505 | done = true; | |
3506 | ||
3507 | goto finish; | |
3508 | } | |
3509 | ||
3510 | /* Find highest min desired voltage */ | |
3511 | for (i = 0; i < n_coupled; i++) { | |
3512 | int tmp_min = 0; | |
3513 | int tmp_max = INT_MAX; | |
3514 | ||
f8702f9e | 3515 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3516 | |
3517 | ret = regulator_check_consumers(c_rdevs[i], | |
3518 | &tmp_min, | |
3519 | &tmp_max, state); | |
3520 | if (ret < 0) | |
3521 | return ret; | |
3522 | ||
3523 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3524 | if (ret < 0) | |
3525 | return ret; | |
69686176 | 3526 | |
c054c6c7 MP |
3527 | highest_min_uV = max(highest_min_uV, tmp_min); |
3528 | ||
3529 | if (i == 0) { | |
3530 | desired_min_uV = tmp_min; | |
3531 | desired_max_uV = tmp_max; | |
3532 | } | |
3533 | } | |
3534 | ||
3535 | /* | |
3536 | * Let target_uV be equal to the desired one if possible. | |
3537 | * If not, set it to minimum voltage, allowed by other coupled | |
3538 | * regulators. | |
3539 | */ | |
3540 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3541 | ||
3542 | /* | |
3543 | * Find min and max voltages, which currently aren't violating | |
3544 | * max_spread. | |
3545 | */ | |
3546 | for (i = 1; i < n_coupled; i++) { | |
3547 | int tmp_act; | |
3548 | ||
3549 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3550 | continue; | |
3551 | ||
3552 | tmp_act = _regulator_get_voltage(c_rdevs[i]); | |
3553 | if (tmp_act < 0) | |
3554 | return tmp_act; | |
3555 | ||
3556 | min_current_uV = min(tmp_act, min_current_uV); | |
3557 | max_current_uV = max(tmp_act, max_current_uV); | |
3558 | } | |
3559 | ||
3560 | /* There aren't any other regulators enabled */ | |
3561 | if (max_current_uV == 0) { | |
3562 | possible_uV = target_uV; | |
3563 | } else { | |
3564 | /* | |
3565 | * Correct target voltage, so as it currently isn't | |
3566 | * violating max_spread | |
3567 | */ | |
3568 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3569 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3570 | } | |
3571 | ||
3572 | if (possible_uV > desired_max_uV) | |
3573 | return -EINVAL; | |
3574 | ||
3575 | done = (possible_uV == target_uV); | |
3576 | desired_min_uV = possible_uV; | |
3577 | ||
3578 | finish: | |
85254bcf DO |
3579 | /* Apply max_uV_step constraint if necessary */ |
3580 | if (state == PM_SUSPEND_ON) { | |
3581 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3582 | &desired_min_uV); | |
3583 | if (ret < 0) | |
3584 | return ret; | |
3585 | ||
3586 | if (ret == 0) | |
3587 | done = false; | |
3588 | } | |
3589 | ||
c054c6c7 MP |
3590 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3591 | if (n_coupled > 1 && *current_uV == -1) { | |
3592 | ||
3593 | if (_regulator_is_enabled(rdev)) { | |
3594 | ret = _regulator_get_voltage(rdev); | |
3595 | if (ret < 0) | |
3596 | return ret; | |
3597 | ||
3598 | *current_uV = ret; | |
3599 | } else { | |
3600 | *current_uV = desired_min_uV; | |
3601 | } | |
3602 | } | |
3603 | ||
3604 | *min_uV = desired_min_uV; | |
3605 | *max_uV = desired_max_uV; | |
3606 | ||
3607 | return done; | |
3608 | } | |
3609 | ||
3610 | static int regulator_balance_voltage(struct regulator_dev *rdev, | |
3611 | suspend_state_t state) | |
3612 | { | |
3613 | struct regulator_dev **c_rdevs; | |
3614 | struct regulator_dev *best_rdev; | |
3615 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3616 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
3617 | bool best_c_rdev_done, c_rdev_done[MAX_COUPLED]; | |
3618 | unsigned int delta, best_delta; | |
3619 | ||
3620 | c_rdevs = c_desc->coupled_rdevs; | |
3621 | n_coupled = c_desc->n_coupled; | |
3622 | ||
3623 | /* | |
3624 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3625 | * other coupled regulators. | |
3626 | */ | |
3627 | if (state != PM_SUSPEND_ON) | |
3628 | n_coupled = 1; | |
3629 | ||
3630 | if (c_desc->n_resolved < n_coupled) { | |
3631 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3632 | return -EPERM; | |
3633 | } | |
3634 | ||
3635 | for (i = 0; i < n_coupled; i++) | |
3636 | c_rdev_done[i] = false; | |
3637 | ||
3638 | /* | |
3639 | * Find the best possible voltage change on each loop. Leave the loop | |
3640 | * if there isn't any possible change. | |
3641 | */ | |
3642 | do { | |
3643 | best_c_rdev_done = false; | |
3644 | best_delta = 0; | |
3645 | best_min_uV = 0; | |
3646 | best_max_uV = 0; | |
3647 | best_c_rdev = 0; | |
3648 | best_rdev = NULL; | |
3649 | ||
3650 | /* | |
3651 | * Find highest difference between optimal voltage | |
3652 | * and current voltage. | |
3653 | */ | |
3654 | for (i = 0; i < n_coupled; i++) { | |
3655 | /* | |
3656 | * optimal_uV is the best voltage that can be set for | |
3657 | * i-th regulator at the moment without violating | |
3658 | * max_spread constraint in order to balance | |
3659 | * the coupled voltages. | |
3660 | */ | |
3661 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3662 | ||
3663 | if (c_rdev_done[i]) | |
3664 | continue; | |
3665 | ||
3666 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3667 | ¤t_uV, | |
3668 | &optimal_uV, | |
3669 | &optimal_max_uV, | |
3670 | state, n_coupled); | |
3671 | if (ret < 0) | |
3672 | goto out; | |
3673 | ||
3674 | delta = abs(optimal_uV - current_uV); | |
3675 | ||
3676 | if (delta && best_delta <= delta) { | |
3677 | best_c_rdev_done = ret; | |
3678 | best_delta = delta; | |
3679 | best_rdev = c_rdevs[i]; | |
3680 | best_min_uV = optimal_uV; | |
3681 | best_max_uV = optimal_max_uV; | |
3682 | best_c_rdev = i; | |
3683 | } | |
3684 | } | |
3685 | ||
3686 | /* Nothing to change, return successfully */ | |
3687 | if (!best_rdev) { | |
3688 | ret = 0; | |
3689 | goto out; | |
3690 | } | |
9243a195 | 3691 | |
c054c6c7 MP |
3692 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3693 | best_max_uV, state); | |
9243a195 | 3694 | |
c054c6c7 MP |
3695 | if (ret < 0) |
3696 | goto out; | |
3697 | ||
3698 | c_rdev_done[best_c_rdev] = best_c_rdev_done; | |
3699 | ||
3700 | } while (n_coupled > 1); | |
3701 | ||
3702 | out: | |
69686176 MP |
3703 | return ret; |
3704 | } | |
3705 | ||
a9f226bc SH |
3706 | /** |
3707 | * regulator_set_voltage - set regulator output voltage | |
3708 | * @regulator: regulator source | |
3709 | * @min_uV: Minimum required voltage in uV | |
3710 | * @max_uV: Maximum acceptable voltage in uV | |
3711 | * | |
3712 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3713 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3714 | * | |
3715 | * If the regulator is enabled then the voltage will change to the new value | |
3716 | * immediately otherwise if the regulator is disabled the regulator will | |
3717 | * output at the new voltage when enabled. | |
3718 | * | |
3719 | * NOTE: If the regulator is shared between several devices then the lowest | |
3720 | * request voltage that meets the system constraints will be used. | |
3721 | * Regulator system constraints must be set for this regulator before | |
3722 | * calling this function otherwise this call will fail. | |
3723 | */ | |
3724 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3725 | { | |
f8702f9e DO |
3726 | struct ww_acquire_ctx ww_ctx; |
3727 | int ret; | |
a9f226bc | 3728 | |
f8702f9e | 3729 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3730 | |
c360a6df CZ |
3731 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3732 | PM_SUSPEND_ON); | |
a9f226bc | 3733 | |
f8702f9e | 3734 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3735 | |
414c70cb LG |
3736 | return ret; |
3737 | } | |
3738 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3739 | ||
f7efad10 CZ |
3740 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3741 | suspend_state_t state, bool en) | |
3742 | { | |
3743 | struct regulator_state *rstate; | |
3744 | ||
3745 | rstate = regulator_get_suspend_state(rdev, state); | |
3746 | if (rstate == NULL) | |
3747 | return -EINVAL; | |
3748 | ||
3749 | if (!rstate->changeable) | |
3750 | return -EPERM; | |
3751 | ||
3edd79cf | 3752 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3753 | |
3754 | return 0; | |
3755 | } | |
3756 | ||
3757 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3758 | suspend_state_t state) | |
3759 | { | |
3760 | return regulator_suspend_toggle(rdev, state, true); | |
3761 | } | |
3762 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3763 | ||
3764 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3765 | suspend_state_t state) | |
3766 | { | |
3767 | struct regulator *regulator; | |
3768 | struct regulator_voltage *voltage; | |
3769 | ||
3770 | /* | |
3771 | * if any consumer wants this regulator device keeping on in | |
3772 | * suspend states, don't set it as disabled. | |
3773 | */ | |
3774 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3775 | voltage = ®ulator->voltage[state]; | |
3776 | if (voltage->min_uV || voltage->max_uV) | |
3777 | return 0; | |
3778 | } | |
3779 | ||
3780 | return regulator_suspend_toggle(rdev, state, false); | |
3781 | } | |
3782 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3783 | ||
3784 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3785 | int min_uV, int max_uV, | |
3786 | suspend_state_t state) | |
3787 | { | |
3788 | struct regulator_dev *rdev = regulator->rdev; | |
3789 | struct regulator_state *rstate; | |
3790 | ||
3791 | rstate = regulator_get_suspend_state(rdev, state); | |
3792 | if (rstate == NULL) | |
3793 | return -EINVAL; | |
3794 | ||
3795 | if (rstate->min_uV == rstate->max_uV) { | |
3796 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3797 | return -EPERM; | |
3798 | } | |
3799 | ||
3800 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3801 | } | |
3802 | ||
3803 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3804 | int max_uV, suspend_state_t state) | |
3805 | { | |
f8702f9e DO |
3806 | struct ww_acquire_ctx ww_ctx; |
3807 | int ret; | |
f7efad10 CZ |
3808 | |
3809 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3810 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3811 | return -EINVAL; | |
3812 | ||
f8702f9e | 3813 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3814 | |
3815 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3816 | max_uV, state); | |
3817 | ||
f8702f9e | 3818 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3819 | |
3820 | return ret; | |
3821 | } | |
3822 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3823 | ||
88cd222b LW |
3824 | /** |
3825 | * regulator_set_voltage_time - get raise/fall time | |
3826 | * @regulator: regulator source | |
3827 | * @old_uV: starting voltage in microvolts | |
3828 | * @new_uV: target voltage in microvolts | |
3829 | * | |
3830 | * Provided with the starting and ending voltage, this function attempts to | |
3831 | * calculate the time in microseconds required to rise or fall to this new | |
3832 | * voltage. | |
3833 | */ | |
3834 | int regulator_set_voltage_time(struct regulator *regulator, | |
3835 | int old_uV, int new_uV) | |
3836 | { | |
272e2315 GX |
3837 | struct regulator_dev *rdev = regulator->rdev; |
3838 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3839 | int old_sel = -1; |
3840 | int new_sel = -1; | |
3841 | int voltage; | |
3842 | int i; | |
3843 | ||
73e705bf MK |
3844 | if (ops->set_voltage_time) |
3845 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
3846 | else if (!ops->set_voltage_time_sel) | |
3847 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
3848 | ||
88cd222b | 3849 | /* Currently requires operations to do this */ |
73e705bf | 3850 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
3851 | return -EINVAL; |
3852 | ||
3853 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3854 | /* We only look for exact voltage matches here */ | |
3855 | voltage = regulator_list_voltage(regulator, i); | |
3856 | if (voltage < 0) | |
3857 | return -EINVAL; | |
3858 | if (voltage == 0) | |
3859 | continue; | |
3860 | if (voltage == old_uV) | |
3861 | old_sel = i; | |
3862 | if (voltage == new_uV) | |
3863 | new_sel = i; | |
3864 | } | |
3865 | ||
3866 | if (old_sel < 0 || new_sel < 0) | |
3867 | return -EINVAL; | |
3868 | ||
3869 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3870 | } | |
3871 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3872 | ||
98a175b6 | 3873 | /** |
296c6566 RD |
3874 | * regulator_set_voltage_time_sel - get raise/fall time |
3875 | * @rdev: regulator source device | |
98a175b6 YSB |
3876 | * @old_selector: selector for starting voltage |
3877 | * @new_selector: selector for target voltage | |
3878 | * | |
3879 | * Provided with the starting and target voltage selectors, this function | |
3880 | * returns time in microseconds required to rise or fall to this new voltage | |
3881 | * | |
f11d08c3 | 3882 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3883 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3884 | */ |
3885 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3886 | unsigned int old_selector, | |
3887 | unsigned int new_selector) | |
3888 | { | |
f11d08c3 | 3889 | int old_volt, new_volt; |
398715ab | 3890 | |
f11d08c3 AL |
3891 | /* sanity check */ |
3892 | if (!rdev->desc->ops->list_voltage) | |
3893 | return -EINVAL; | |
398715ab | 3894 | |
f11d08c3 AL |
3895 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3896 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3897 | ||
73e705bf MK |
3898 | if (rdev->desc->ops->set_voltage_time) |
3899 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
3900 | new_volt); | |
3901 | else | |
3902 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 3903 | } |
b19dbf71 | 3904 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3905 | |
606a2562 MB |
3906 | /** |
3907 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3908 | * @regulator: regulator source | |
3909 | * | |
3910 | * Re-apply the last configured voltage. This is intended to be used | |
3911 | * where some external control source the consumer is cooperating with | |
3912 | * has caused the configured voltage to change. | |
3913 | */ | |
3914 | int regulator_sync_voltage(struct regulator *regulator) | |
3915 | { | |
3916 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3917 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
3918 | int ret, min_uV, max_uV; |
3919 | ||
66cf9a7e | 3920 | regulator_lock(rdev); |
606a2562 MB |
3921 | |
3922 | if (!rdev->desc->ops->set_voltage && | |
3923 | !rdev->desc->ops->set_voltage_sel) { | |
3924 | ret = -EINVAL; | |
3925 | goto out; | |
3926 | } | |
3927 | ||
3928 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 3929 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
3930 | ret = -EINVAL; |
3931 | goto out; | |
3932 | } | |
3933 | ||
c360a6df CZ |
3934 | min_uV = voltage->min_uV; |
3935 | max_uV = voltage->max_uV; | |
606a2562 MB |
3936 | |
3937 | /* This should be a paranoia check... */ | |
3938 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3939 | if (ret < 0) | |
3940 | goto out; | |
3941 | ||
c360a6df | 3942 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
3943 | if (ret < 0) |
3944 | goto out; | |
3945 | ||
3946 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3947 | ||
3948 | out: | |
66cf9a7e | 3949 | regulator_unlock(rdev); |
606a2562 MB |
3950 | return ret; |
3951 | } | |
3952 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3953 | ||
414c70cb LG |
3954 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3955 | { | |
bf5892a8 | 3956 | int sel, ret; |
fef95019 MB |
3957 | bool bypassed; |
3958 | ||
3959 | if (rdev->desc->ops->get_bypass) { | |
3960 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
3961 | if (ret < 0) | |
3962 | return ret; | |
3963 | if (bypassed) { | |
3964 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
3965 | if (!rdev->supply) { |
3966 | rdev_err(rdev, | |
3967 | "bypassed regulator has no supply!\n"); | |
3968 | return -EPROBE_DEFER; | |
3969 | } | |
fef95019 MB |
3970 | |
3971 | return _regulator_get_voltage(rdev->supply->rdev); | |
3972 | } | |
3973 | } | |
476c2d83 MB |
3974 | |
3975 | if (rdev->desc->ops->get_voltage_sel) { | |
3976 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3977 | if (sel < 0) | |
3978 | return sel; | |
bf5892a8 | 3979 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3980 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3981 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3982 | } else if (rdev->desc->ops->list_voltage) { |
3983 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3984 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3985 | ret = rdev->desc->fixed_uV; | |
e303996e | 3986 | } else if (rdev->supply) { |
d9b96d35 | 3987 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3988 | } else { |
414c70cb | 3989 | return -EINVAL; |
cb220d16 | 3990 | } |
bf5892a8 | 3991 | |
cb220d16 AL |
3992 | if (ret < 0) |
3993 | return ret; | |
bf5892a8 | 3994 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3995 | } |
3996 | ||
3997 | /** | |
3998 | * regulator_get_voltage - get regulator output voltage | |
3999 | * @regulator: regulator source | |
4000 | * | |
4001 | * This returns the current regulator voltage in uV. | |
4002 | * | |
4003 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4004 | * function should not be used to determine regulator state. | |
4005 | */ | |
4006 | int regulator_get_voltage(struct regulator *regulator) | |
4007 | { | |
f8702f9e | 4008 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4009 | int ret; |
4010 | ||
f8702f9e | 4011 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
414c70cb | 4012 | ret = _regulator_get_voltage(regulator->rdev); |
f8702f9e | 4013 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4014 | |
4015 | return ret; | |
4016 | } | |
4017 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4018 | ||
4019 | /** | |
4020 | * regulator_set_current_limit - set regulator output current limit | |
4021 | * @regulator: regulator source | |
ce0d10f8 | 4022 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4023 | * @max_uA: Maximum supported current in uA |
4024 | * | |
4025 | * Sets current sink to the desired output current. This can be set during | |
4026 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4027 | * | |
4028 | * If the regulator is enabled then the current will change to the new value | |
4029 | * immediately otherwise if the regulator is disabled the regulator will | |
4030 | * output at the new current when enabled. | |
4031 | * | |
4032 | * NOTE: Regulator system constraints must be set for this regulator before | |
4033 | * calling this function otherwise this call will fail. | |
4034 | */ | |
4035 | int regulator_set_current_limit(struct regulator *regulator, | |
4036 | int min_uA, int max_uA) | |
4037 | { | |
4038 | struct regulator_dev *rdev = regulator->rdev; | |
4039 | int ret; | |
4040 | ||
66cf9a7e | 4041 | regulator_lock(rdev); |
414c70cb LG |
4042 | |
4043 | /* sanity check */ | |
4044 | if (!rdev->desc->ops->set_current_limit) { | |
4045 | ret = -EINVAL; | |
4046 | goto out; | |
4047 | } | |
4048 | ||
4049 | /* constraints check */ | |
4050 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4051 | if (ret < 0) | |
4052 | goto out; | |
4053 | ||
4054 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4055 | out: | |
66cf9a7e | 4056 | regulator_unlock(rdev); |
414c70cb LG |
4057 | return ret; |
4058 | } | |
4059 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4060 | ||
7e4d9683 DA |
4061 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4062 | { | |
4063 | /* sanity check */ | |
4064 | if (!rdev->desc->ops->get_current_limit) | |
4065 | return -EINVAL; | |
4066 | ||
4067 | return rdev->desc->ops->get_current_limit(rdev); | |
4068 | } | |
4069 | ||
414c70cb LG |
4070 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4071 | { | |
4072 | int ret; | |
4073 | ||
66cf9a7e | 4074 | regulator_lock(rdev); |
7e4d9683 | 4075 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4076 | regulator_unlock(rdev); |
7e4d9683 | 4077 | |
414c70cb LG |
4078 | return ret; |
4079 | } | |
4080 | ||
4081 | /** | |
4082 | * regulator_get_current_limit - get regulator output current | |
4083 | * @regulator: regulator source | |
4084 | * | |
4085 | * This returns the current supplied by the specified current sink in uA. | |
4086 | * | |
4087 | * NOTE: If the regulator is disabled it will return the current value. This | |
4088 | * function should not be used to determine regulator state. | |
4089 | */ | |
4090 | int regulator_get_current_limit(struct regulator *regulator) | |
4091 | { | |
4092 | return _regulator_get_current_limit(regulator->rdev); | |
4093 | } | |
4094 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4095 | ||
4096 | /** | |
4097 | * regulator_set_mode - set regulator operating mode | |
4098 | * @regulator: regulator source | |
4099 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4100 | * | |
4101 | * Set regulator operating mode to increase regulator efficiency or improve | |
4102 | * regulation performance. | |
4103 | * | |
4104 | * NOTE: Regulator system constraints must be set for this regulator before | |
4105 | * calling this function otherwise this call will fail. | |
4106 | */ | |
4107 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4108 | { | |
4109 | struct regulator_dev *rdev = regulator->rdev; | |
4110 | int ret; | |
500b4ac9 | 4111 | int regulator_curr_mode; |
414c70cb | 4112 | |
66cf9a7e | 4113 | regulator_lock(rdev); |
414c70cb LG |
4114 | |
4115 | /* sanity check */ | |
4116 | if (!rdev->desc->ops->set_mode) { | |
4117 | ret = -EINVAL; | |
4118 | goto out; | |
4119 | } | |
4120 | ||
500b4ac9 SI |
4121 | /* return if the same mode is requested */ |
4122 | if (rdev->desc->ops->get_mode) { | |
4123 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4124 | if (regulator_curr_mode == mode) { | |
4125 | ret = 0; | |
4126 | goto out; | |
4127 | } | |
4128 | } | |
4129 | ||
414c70cb | 4130 | /* constraints check */ |
22c51b47 | 4131 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4132 | if (ret < 0) |
4133 | goto out; | |
4134 | ||
4135 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4136 | out: | |
66cf9a7e | 4137 | regulator_unlock(rdev); |
414c70cb LG |
4138 | return ret; |
4139 | } | |
4140 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4141 | ||
7e4d9683 DA |
4142 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4143 | { | |
4144 | /* sanity check */ | |
4145 | if (!rdev->desc->ops->get_mode) | |
4146 | return -EINVAL; | |
4147 | ||
4148 | return rdev->desc->ops->get_mode(rdev); | |
4149 | } | |
4150 | ||
414c70cb LG |
4151 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4152 | { | |
4153 | int ret; | |
4154 | ||
66cf9a7e | 4155 | regulator_lock(rdev); |
7e4d9683 | 4156 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4157 | regulator_unlock(rdev); |
7e4d9683 | 4158 | |
414c70cb LG |
4159 | return ret; |
4160 | } | |
4161 | ||
4162 | /** | |
4163 | * regulator_get_mode - get regulator operating mode | |
4164 | * @regulator: regulator source | |
4165 | * | |
4166 | * Get the current regulator operating mode. | |
4167 | */ | |
4168 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4169 | { | |
4170 | return _regulator_get_mode(regulator->rdev); | |
4171 | } | |
4172 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4173 | ||
1b5b4221 AH |
4174 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4175 | unsigned int *flags) | |
4176 | { | |
4177 | int ret; | |
4178 | ||
66cf9a7e | 4179 | regulator_lock(rdev); |
1b5b4221 AH |
4180 | |
4181 | /* sanity check */ | |
4182 | if (!rdev->desc->ops->get_error_flags) { | |
4183 | ret = -EINVAL; | |
4184 | goto out; | |
4185 | } | |
4186 | ||
4187 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4188 | out: | |
66cf9a7e | 4189 | regulator_unlock(rdev); |
1b5b4221 AH |
4190 | return ret; |
4191 | } | |
4192 | ||
4193 | /** | |
4194 | * regulator_get_error_flags - get regulator error information | |
4195 | * @regulator: regulator source | |
4196 | * @flags: pointer to store error flags | |
4197 | * | |
4198 | * Get the current regulator error information. | |
4199 | */ | |
4200 | int regulator_get_error_flags(struct regulator *regulator, | |
4201 | unsigned int *flags) | |
4202 | { | |
4203 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4204 | } | |
4205 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4206 | ||
414c70cb | 4207 | /** |
e39ce48f | 4208 | * regulator_set_load - set regulator load |
414c70cb LG |
4209 | * @regulator: regulator source |
4210 | * @uA_load: load current | |
4211 | * | |
4212 | * Notifies the regulator core of a new device load. This is then used by | |
4213 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4214 | * operating mode for the new regulator loading. | |
4215 | * | |
4216 | * Consumer devices notify their supply regulator of the maximum power | |
4217 | * they will require (can be taken from device datasheet in the power | |
4218 | * consumption tables) when they change operational status and hence power | |
4219 | * state. Examples of operational state changes that can affect power | |
4220 | * consumption are :- | |
4221 | * | |
4222 | * o Device is opened / closed. | |
4223 | * o Device I/O is about to begin or has just finished. | |
4224 | * o Device is idling in between work. | |
4225 | * | |
4226 | * This information is also exported via sysfs to userspace. | |
4227 | * | |
4228 | * DRMS will sum the total requested load on the regulator and change | |
4229 | * to the most efficient operating mode if platform constraints allow. | |
4230 | * | |
5451781d DA |
4231 | * NOTE: when a regulator consumer requests to have a regulator |
4232 | * disabled then any load that consumer requested no longer counts | |
4233 | * toward the total requested load. If the regulator is re-enabled | |
4234 | * then the previously requested load will start counting again. | |
4235 | * | |
4236 | * If a regulator is an always-on regulator then an individual consumer's | |
4237 | * load will still be removed if that consumer is fully disabled. | |
4238 | * | |
e39ce48f | 4239 | * On error a negative errno is returned. |
414c70cb | 4240 | */ |
e39ce48f | 4241 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4242 | { |
4243 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4244 | int old_uA_load; |
4245 | int ret = 0; | |
d92d95b6 | 4246 | |
66cf9a7e | 4247 | regulator_lock(rdev); |
5451781d | 4248 | old_uA_load = regulator->uA_load; |
414c70cb | 4249 | regulator->uA_load = uA_load; |
5451781d DA |
4250 | if (regulator->enable_count && old_uA_load != uA_load) { |
4251 | ret = drms_uA_update(rdev); | |
4252 | if (ret < 0) | |
4253 | regulator->uA_load = old_uA_load; | |
4254 | } | |
66cf9a7e | 4255 | regulator_unlock(rdev); |
8460ef38 | 4256 | |
414c70cb LG |
4257 | return ret; |
4258 | } | |
e39ce48f | 4259 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4260 | |
f59c8f9f MB |
4261 | /** |
4262 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4263 | * | |
4264 | * @regulator: Regulator to configure | |
9345dfb8 | 4265 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4266 | * |
4267 | * Allow the regulator to go into bypass mode if all other consumers | |
4268 | * for the regulator also enable bypass mode and the machine | |
4269 | * constraints allow this. Bypass mode means that the regulator is | |
4270 | * simply passing the input directly to the output with no regulation. | |
4271 | */ | |
4272 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4273 | { | |
4274 | struct regulator_dev *rdev = regulator->rdev; | |
4275 | int ret = 0; | |
4276 | ||
4277 | if (!rdev->desc->ops->set_bypass) | |
4278 | return 0; | |
4279 | ||
8a34e979 | 4280 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4281 | return 0; |
4282 | ||
66cf9a7e | 4283 | regulator_lock(rdev); |
f59c8f9f MB |
4284 | |
4285 | if (enable && !regulator->bypass) { | |
4286 | rdev->bypass_count++; | |
4287 | ||
4288 | if (rdev->bypass_count == rdev->open_count) { | |
4289 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4290 | if (ret != 0) | |
4291 | rdev->bypass_count--; | |
4292 | } | |
4293 | ||
4294 | } else if (!enable && regulator->bypass) { | |
4295 | rdev->bypass_count--; | |
4296 | ||
4297 | if (rdev->bypass_count != rdev->open_count) { | |
4298 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
4299 | if (ret != 0) | |
4300 | rdev->bypass_count++; | |
4301 | } | |
4302 | } | |
4303 | ||
4304 | if (ret == 0) | |
4305 | regulator->bypass = enable; | |
4306 | ||
66cf9a7e | 4307 | regulator_unlock(rdev); |
f59c8f9f MB |
4308 | |
4309 | return ret; | |
4310 | } | |
4311 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4312 | ||
414c70cb LG |
4313 | /** |
4314 | * regulator_register_notifier - register regulator event notifier | |
4315 | * @regulator: regulator source | |
69279fb9 | 4316 | * @nb: notifier block |
414c70cb LG |
4317 | * |
4318 | * Register notifier block to receive regulator events. | |
4319 | */ | |
4320 | int regulator_register_notifier(struct regulator *regulator, | |
4321 | struct notifier_block *nb) | |
4322 | { | |
4323 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4324 | nb); | |
4325 | } | |
4326 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4327 | ||
4328 | /** | |
4329 | * regulator_unregister_notifier - unregister regulator event notifier | |
4330 | * @regulator: regulator source | |
69279fb9 | 4331 | * @nb: notifier block |
414c70cb LG |
4332 | * |
4333 | * Unregister regulator event notifier block. | |
4334 | */ | |
4335 | int regulator_unregister_notifier(struct regulator *regulator, | |
4336 | struct notifier_block *nb) | |
4337 | { | |
4338 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4339 | nb); | |
4340 | } | |
4341 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4342 | ||
b136fb44 JC |
4343 | /* notify regulator consumers and downstream regulator consumers. |
4344 | * Note mutex must be held by caller. | |
4345 | */ | |
7179569a | 4346 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4347 | unsigned long event, void *data) |
4348 | { | |
414c70cb | 4349 | /* call rdev chain first */ |
7179569a | 4350 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4351 | } |
4352 | ||
4353 | /** | |
4354 | * regulator_bulk_get - get multiple regulator consumers | |
4355 | * | |
4356 | * @dev: Device to supply | |
4357 | * @num_consumers: Number of consumers to register | |
4358 | * @consumers: Configuration of consumers; clients are stored here. | |
4359 | * | |
4360 | * @return 0 on success, an errno on failure. | |
4361 | * | |
4362 | * This helper function allows drivers to get several regulator | |
4363 | * consumers in one operation. If any of the regulators cannot be | |
4364 | * acquired then any regulators that were allocated will be freed | |
4365 | * before returning to the caller. | |
4366 | */ | |
4367 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4368 | struct regulator_bulk_data *consumers) | |
4369 | { | |
4370 | int i; | |
4371 | int ret; | |
4372 | ||
4373 | for (i = 0; i < num_consumers; i++) | |
4374 | consumers[i].consumer = NULL; | |
4375 | ||
4376 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4377 | consumers[i].consumer = regulator_get(dev, |
4378 | consumers[i].supply); | |
414c70cb | 4379 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 4380 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
4381 | dev_err(dev, "Failed to get supply '%s': %d\n", |
4382 | consumers[i].supply, ret); | |
414c70cb LG |
4383 | consumers[i].consumer = NULL; |
4384 | goto err; | |
4385 | } | |
4386 | } | |
4387 | ||
4388 | return 0; | |
4389 | ||
4390 | err: | |
b29c7690 | 4391 | while (--i >= 0) |
414c70cb LG |
4392 | regulator_put(consumers[i].consumer); |
4393 | ||
4394 | return ret; | |
4395 | } | |
4396 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4397 | ||
f21e0e81 MB |
4398 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4399 | { | |
4400 | struct regulator_bulk_data *bulk = data; | |
4401 | ||
4402 | bulk->ret = regulator_enable(bulk->consumer); | |
4403 | } | |
4404 | ||
414c70cb LG |
4405 | /** |
4406 | * regulator_bulk_enable - enable multiple regulator consumers | |
4407 | * | |
4408 | * @num_consumers: Number of consumers | |
4409 | * @consumers: Consumer data; clients are stored here. | |
4410 | * @return 0 on success, an errno on failure | |
4411 | * | |
4412 | * This convenience API allows consumers to enable multiple regulator | |
4413 | * clients in a single API call. If any consumers cannot be enabled | |
4414 | * then any others that were enabled will be disabled again prior to | |
4415 | * return. | |
4416 | */ | |
4417 | int regulator_bulk_enable(int num_consumers, | |
4418 | struct regulator_bulk_data *consumers) | |
4419 | { | |
2955b47d | 4420 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4421 | int i; |
f21e0e81 | 4422 | int ret = 0; |
414c70cb | 4423 | |
6492bc1b | 4424 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4425 | async_schedule_domain(regulator_bulk_enable_async, |
4426 | &consumers[i], &async_domain); | |
6492bc1b | 4427 | } |
f21e0e81 MB |
4428 | |
4429 | async_synchronize_full_domain(&async_domain); | |
4430 | ||
4431 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4432 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4433 | if (consumers[i].ret != 0) { |
4434 | ret = consumers[i].ret; | |
414c70cb | 4435 | goto err; |
f21e0e81 | 4436 | } |
414c70cb LG |
4437 | } |
4438 | ||
4439 | return 0; | |
4440 | ||
4441 | err: | |
fbe31057 AH |
4442 | for (i = 0; i < num_consumers; i++) { |
4443 | if (consumers[i].ret < 0) | |
4444 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
4445 | consumers[i].ret); | |
4446 | else | |
4447 | regulator_disable(consumers[i].consumer); | |
4448 | } | |
414c70cb LG |
4449 | |
4450 | return ret; | |
4451 | } | |
4452 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4453 | ||
4454 | /** | |
4455 | * regulator_bulk_disable - disable multiple regulator consumers | |
4456 | * | |
4457 | * @num_consumers: Number of consumers | |
4458 | * @consumers: Consumer data; clients are stored here. | |
4459 | * @return 0 on success, an errno on failure | |
4460 | * | |
4461 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4462 | * clients in a single API call. If any consumers cannot be disabled |
4463 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4464 | * return. |
4465 | */ | |
4466 | int regulator_bulk_disable(int num_consumers, | |
4467 | struct regulator_bulk_data *consumers) | |
4468 | { | |
4469 | int i; | |
01e86f49 | 4470 | int ret, r; |
414c70cb | 4471 | |
49e22632 | 4472 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4473 | ret = regulator_disable(consumers[i].consumer); |
4474 | if (ret != 0) | |
4475 | goto err; | |
4476 | } | |
4477 | ||
4478 | return 0; | |
4479 | ||
4480 | err: | |
5da84fd9 | 4481 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
4482 | for (++i; i < num_consumers; ++i) { |
4483 | r = regulator_enable(consumers[i].consumer); | |
4484 | if (r != 0) | |
d1642ea7 | 4485 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
4486 | consumers[i].supply, r); |
4487 | } | |
414c70cb LG |
4488 | |
4489 | return ret; | |
4490 | } | |
4491 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4492 | ||
e1de2f42 DK |
4493 | /** |
4494 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4495 | * | |
4496 | * @num_consumers: Number of consumers | |
4497 | * @consumers: Consumer data; clients are stored here. | |
4498 | * @return 0 on success, an errno on failure | |
4499 | * | |
4500 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4501 | * clients in a single API call. | |
4502 | * NOTE: This should be used for situations when device damage will | |
4503 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4504 | * Although regulator_force_disable function call for some consumers can | |
4505 | * return error numbers, the function is called for all consumers. | |
4506 | */ | |
4507 | int regulator_bulk_force_disable(int num_consumers, | |
4508 | struct regulator_bulk_data *consumers) | |
4509 | { | |
4510 | int i; | |
b8c77ff6 | 4511 | int ret = 0; |
e1de2f42 | 4512 | |
b8c77ff6 | 4513 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4514 | consumers[i].ret = |
4515 | regulator_force_disable(consumers[i].consumer); | |
4516 | ||
b8c77ff6 DT |
4517 | /* Store first error for reporting */ |
4518 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4519 | ret = consumers[i].ret; |
e1de2f42 DK |
4520 | } |
4521 | ||
e1de2f42 DK |
4522 | return ret; |
4523 | } | |
4524 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4525 | ||
414c70cb LG |
4526 | /** |
4527 | * regulator_bulk_free - free multiple regulator consumers | |
4528 | * | |
4529 | * @num_consumers: Number of consumers | |
4530 | * @consumers: Consumer data; clients are stored here. | |
4531 | * | |
4532 | * This convenience API allows consumers to free multiple regulator | |
4533 | * clients in a single API call. | |
4534 | */ | |
4535 | void regulator_bulk_free(int num_consumers, | |
4536 | struct regulator_bulk_data *consumers) | |
4537 | { | |
4538 | int i; | |
4539 | ||
4540 | for (i = 0; i < num_consumers; i++) { | |
4541 | regulator_put(consumers[i].consumer); | |
4542 | consumers[i].consumer = NULL; | |
4543 | } | |
4544 | } | |
4545 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4546 | ||
4547 | /** | |
4548 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4549 | * @rdev: regulator source |
414c70cb | 4550 | * @event: notifier block |
69279fb9 | 4551 | * @data: callback-specific data. |
414c70cb LG |
4552 | * |
4553 | * Called by regulator drivers to notify clients a regulator event has | |
4554 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 4555 | * Note lock must be held by caller. |
414c70cb LG |
4556 | */ |
4557 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4558 | unsigned long event, void *data) | |
4559 | { | |
f8702f9e | 4560 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 4561 | |
414c70cb LG |
4562 | _notifier_call_chain(rdev, event, data); |
4563 | return NOTIFY_DONE; | |
4564 | ||
4565 | } | |
4566 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4567 | ||
be721979 MB |
4568 | /** |
4569 | * regulator_mode_to_status - convert a regulator mode into a status | |
4570 | * | |
4571 | * @mode: Mode to convert | |
4572 | * | |
4573 | * Convert a regulator mode into a status. | |
4574 | */ | |
4575 | int regulator_mode_to_status(unsigned int mode) | |
4576 | { | |
4577 | switch (mode) { | |
4578 | case REGULATOR_MODE_FAST: | |
4579 | return REGULATOR_STATUS_FAST; | |
4580 | case REGULATOR_MODE_NORMAL: | |
4581 | return REGULATOR_STATUS_NORMAL; | |
4582 | case REGULATOR_MODE_IDLE: | |
4583 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4584 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4585 | return REGULATOR_STATUS_STANDBY; |
4586 | default: | |
1beaf762 | 4587 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4588 | } |
4589 | } | |
4590 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4591 | ||
39f802d6 TI |
4592 | static struct attribute *regulator_dev_attrs[] = { |
4593 | &dev_attr_name.attr, | |
4594 | &dev_attr_num_users.attr, | |
4595 | &dev_attr_type.attr, | |
4596 | &dev_attr_microvolts.attr, | |
4597 | &dev_attr_microamps.attr, | |
4598 | &dev_attr_opmode.attr, | |
4599 | &dev_attr_state.attr, | |
4600 | &dev_attr_status.attr, | |
4601 | &dev_attr_bypass.attr, | |
4602 | &dev_attr_requested_microamps.attr, | |
4603 | &dev_attr_min_microvolts.attr, | |
4604 | &dev_attr_max_microvolts.attr, | |
4605 | &dev_attr_min_microamps.attr, | |
4606 | &dev_attr_max_microamps.attr, | |
4607 | &dev_attr_suspend_standby_state.attr, | |
4608 | &dev_attr_suspend_mem_state.attr, | |
4609 | &dev_attr_suspend_disk_state.attr, | |
4610 | &dev_attr_suspend_standby_microvolts.attr, | |
4611 | &dev_attr_suspend_mem_microvolts.attr, | |
4612 | &dev_attr_suspend_disk_microvolts.attr, | |
4613 | &dev_attr_suspend_standby_mode.attr, | |
4614 | &dev_attr_suspend_mem_mode.attr, | |
4615 | &dev_attr_suspend_disk_mode.attr, | |
4616 | NULL | |
4617 | }; | |
4618 | ||
7ad68e2f DB |
4619 | /* |
4620 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4621 | * create attributes that can be meaningfully displayed. | |
4622 | */ | |
39f802d6 TI |
4623 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4624 | struct attribute *attr, int idx) | |
7ad68e2f | 4625 | { |
39f802d6 | 4626 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4627 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4628 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4629 | umode_t mode = attr->mode; |
4630 | ||
4631 | /* these three are always present */ | |
4632 | if (attr == &dev_attr_name.attr || | |
4633 | attr == &dev_attr_num_users.attr || | |
4634 | attr == &dev_attr_type.attr) | |
4635 | return mode; | |
7ad68e2f DB |
4636 | |
4637 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4638 | if (attr == &dev_attr_microvolts.attr) { |
4639 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4640 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4641 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4642 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4643 | return mode; | |
4644 | return 0; | |
f59c8f9f | 4645 | } |
7ad68e2f | 4646 | |
39f802d6 TI |
4647 | if (attr == &dev_attr_microamps.attr) |
4648 | return ops->get_current_limit ? mode : 0; | |
4649 | ||
4650 | if (attr == &dev_attr_opmode.attr) | |
4651 | return ops->get_mode ? mode : 0; | |
4652 | ||
4653 | if (attr == &dev_attr_state.attr) | |
4654 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4655 | ||
4656 | if (attr == &dev_attr_status.attr) | |
4657 | return ops->get_status ? mode : 0; | |
4658 | ||
4659 | if (attr == &dev_attr_bypass.attr) | |
4660 | return ops->get_bypass ? mode : 0; | |
4661 | ||
7ad68e2f | 4662 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4663 | if (attr == &dev_attr_min_microvolts.attr || |
4664 | attr == &dev_attr_max_microvolts.attr) | |
4665 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4666 | ||
4667 | if (attr == &dev_attr_min_microamps.attr || | |
4668 | attr == &dev_attr_max_microamps.attr) | |
4669 | return ops->set_current_limit ? mode : 0; | |
4670 | ||
4671 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4672 | attr == &dev_attr_suspend_mem_state.attr || | |
4673 | attr == &dev_attr_suspend_disk_state.attr) | |
4674 | return mode; | |
4675 | ||
4676 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4677 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4678 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4679 | return ops->set_suspend_voltage ? mode : 0; | |
4680 | ||
4681 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4682 | attr == &dev_attr_suspend_mem_mode.attr || | |
4683 | attr == &dev_attr_suspend_disk_mode.attr) | |
4684 | return ops->set_suspend_mode ? mode : 0; | |
4685 | ||
4686 | return mode; | |
4687 | } | |
4688 | ||
4689 | static const struct attribute_group regulator_dev_group = { | |
4690 | .attrs = regulator_dev_attrs, | |
4691 | .is_visible = regulator_attr_is_visible, | |
4692 | }; | |
4693 | ||
4694 | static const struct attribute_group *regulator_dev_groups[] = { | |
4695 | ®ulator_dev_group, | |
4696 | NULL | |
4697 | }; | |
7ad68e2f | 4698 | |
39f802d6 TI |
4699 | static void regulator_dev_release(struct device *dev) |
4700 | { | |
4701 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4702 | |
4703 | kfree(rdev->constraints); | |
4704 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4705 | kfree(rdev); |
7ad68e2f DB |
4706 | } |
4707 | ||
1130e5b3 MB |
4708 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4709 | { | |
a9eaa813 GR |
4710 | struct device *parent = rdev->dev.parent; |
4711 | const char *rname = rdev_get_name(rdev); | |
4712 | char name[NAME_MAX]; | |
4713 | ||
4714 | /* Avoid duplicate debugfs directory names */ | |
4715 | if (parent && rname == rdev->desc->name) { | |
4716 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4717 | rname); | |
4718 | rname = name; | |
4719 | } | |
4720 | ||
4721 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4722 | if (!rdev->debugfs) { |
1130e5b3 | 4723 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4724 | return; |
4725 | } | |
4726 | ||
4727 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4728 | &rdev->use_count); | |
4729 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4730 | &rdev->open_count); | |
f59c8f9f MB |
4731 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4732 | &rdev->bypass_count); | |
1130e5b3 MB |
4733 | } |
4734 | ||
5e3ca2b3 JMC |
4735 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4736 | { | |
7ddede6a JH |
4737 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4738 | ||
4739 | if (regulator_resolve_supply(rdev)) | |
4740 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4741 | ||
4742 | return 0; | |
5e3ca2b3 JMC |
4743 | } |
4744 | ||
f9503385 | 4745 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4746 | { |
4747 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
4748 | int n_coupled = c_desc->n_coupled; | |
4749 | struct regulator_dev *c_rdev; | |
4750 | int i; | |
4751 | ||
4752 | for (i = 1; i < n_coupled; i++) { | |
4753 | /* already resolved */ | |
4754 | if (c_desc->coupled_rdevs[i]) | |
4755 | continue; | |
4756 | ||
4757 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
4758 | ||
f9503385 DO |
4759 | if (!c_rdev) |
4760 | continue; | |
d3d64537 | 4761 | |
f9503385 | 4762 | regulator_lock(c_rdev); |
d3d64537 | 4763 | |
f9503385 DO |
4764 | c_desc->coupled_rdevs[i] = c_rdev; |
4765 | c_desc->n_resolved++; | |
d3d64537 | 4766 | |
f9503385 | 4767 | regulator_unlock(c_rdev); |
d3d64537 | 4768 | |
f9503385 DO |
4769 | regulator_resolve_coupling(c_rdev); |
4770 | } | |
d3d64537 MP |
4771 | } |
4772 | ||
6303f3e7 | 4773 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 4774 | { |
6303f3e7 DO |
4775 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
4776 | struct regulator_dev *__c_rdev, *c_rdev; | |
4777 | unsigned int __n_coupled, n_coupled; | |
4778 | int i, k; | |
d3d64537 | 4779 | |
6303f3e7 | 4780 | n_coupled = c_desc->n_coupled; |
d3d64537 | 4781 | |
6303f3e7 DO |
4782 | for (i = 1; i < n_coupled; i++) { |
4783 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 4784 | |
6303f3e7 DO |
4785 | if (!c_rdev) |
4786 | continue; | |
4787 | ||
4788 | regulator_lock(c_rdev); | |
4789 | ||
4790 | __c_desc = &c_rdev->coupling_desc; | |
4791 | __n_coupled = __c_desc->n_coupled; | |
4792 | ||
4793 | for (k = 1; k < __n_coupled; k++) { | |
4794 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
4795 | ||
4796 | if (__c_rdev == rdev) { | |
4797 | __c_desc->coupled_rdevs[k] = NULL; | |
4798 | __c_desc->n_resolved--; | |
4799 | break; | |
4800 | } | |
4801 | } | |
4802 | ||
4803 | regulator_unlock(c_rdev); | |
4804 | ||
4805 | c_desc->coupled_rdevs[i] = NULL; | |
4806 | c_desc->n_resolved--; | |
4807 | } | |
d3d64537 MP |
4808 | } |
4809 | ||
f9503385 | 4810 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 MP |
4811 | { |
4812 | int n_phandles; | |
4813 | ||
4814 | if (!IS_ENABLED(CONFIG_OF)) | |
4815 | n_phandles = 0; | |
4816 | else | |
4817 | n_phandles = of_get_n_coupled(rdev); | |
4818 | ||
4819 | if (n_phandles + 1 > MAX_COUPLED) { | |
4820 | rdev_err(rdev, "too many regulators coupled\n"); | |
4821 | return -EPERM; | |
4822 | } | |
4823 | ||
4824 | /* | |
4825 | * Every regulator should always have coupling descriptor filled with | |
4826 | * at least pointer to itself. | |
4827 | */ | |
4828 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
4829 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
4830 | rdev->coupling_desc.n_resolved++; | |
4831 | ||
4832 | /* regulator isn't coupled */ | |
4833 | if (n_phandles == 0) | |
4834 | return 0; | |
4835 | ||
4836 | /* regulator, which can't change its voltage, can't be coupled */ | |
4837 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { | |
4838 | rdev_err(rdev, "voltage operation not allowed\n"); | |
4839 | return -EPERM; | |
4840 | } | |
4841 | ||
4842 | if (rdev->constraints->max_spread <= 0) { | |
4843 | rdev_err(rdev, "wrong max_spread value\n"); | |
4844 | return -EPERM; | |
4845 | } | |
4846 | ||
4847 | if (!of_check_coupling_data(rdev)) | |
4848 | return -EPERM; | |
4849 | ||
d3d64537 MP |
4850 | return 0; |
4851 | } | |
4852 | ||
414c70cb LG |
4853 | /** |
4854 | * regulator_register - register regulator | |
69279fb9 | 4855 | * @regulator_desc: regulator to register |
f47531b1 | 4856 | * @cfg: runtime configuration for regulator |
414c70cb LG |
4857 | * |
4858 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
4859 | * Returns a valid pointer to struct regulator_dev on success |
4860 | * or an ERR_PTR() on error. | |
414c70cb | 4861 | */ |
65f26846 MB |
4862 | struct regulator_dev * |
4863 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 4864 | const struct regulator_config *cfg) |
414c70cb | 4865 | { |
9a8f5e07 | 4866 | const struct regulation_constraints *constraints = NULL; |
c172708d | 4867 | const struct regulator_init_data *init_data; |
1b3de223 | 4868 | struct regulator_config *config = NULL; |
72dca06f | 4869 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 4870 | struct regulator_dev *rdev; |
32c8fad4 | 4871 | struct device *dev; |
a5766f11 | 4872 | int ret, i; |
414c70cb | 4873 | |
1b3de223 | 4874 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
4875 | return ERR_PTR(-EINVAL); |
4876 | ||
1b3de223 | 4877 | dev = cfg->dev; |
dcf70112 | 4878 | WARN_ON(!dev); |
32c8fad4 | 4879 | |
414c70cb LG |
4880 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
4881 | return ERR_PTR(-EINVAL); | |
4882 | ||
cd78dfc6 DL |
4883 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
4884 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
4885 | return ERR_PTR(-EINVAL); |
4886 | ||
476c2d83 MB |
4887 | /* Only one of each should be implemented */ |
4888 | WARN_ON(regulator_desc->ops->get_voltage && | |
4889 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
4890 | WARN_ON(regulator_desc->ops->set_voltage && |
4891 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
4892 | |
4893 | /* If we're using selectors we must implement list_voltage. */ | |
4894 | if (regulator_desc->ops->get_voltage_sel && | |
4895 | !regulator_desc->ops->list_voltage) { | |
4896 | return ERR_PTR(-EINVAL); | |
4897 | } | |
e8eef82b MB |
4898 | if (regulator_desc->ops->set_voltage_sel && |
4899 | !regulator_desc->ops->list_voltage) { | |
4900 | return ERR_PTR(-EINVAL); | |
4901 | } | |
476c2d83 | 4902 | |
414c70cb LG |
4903 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
4904 | if (rdev == NULL) | |
4905 | return ERR_PTR(-ENOMEM); | |
4906 | ||
1b3de223 KK |
4907 | /* |
4908 | * Duplicate the config so the driver could override it after | |
4909 | * parsing init data. | |
4910 | */ | |
4911 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
4912 | if (config == NULL) { | |
4913 | kfree(rdev); | |
4914 | return ERR_PTR(-ENOMEM); | |
4915 | } | |
4916 | ||
bfa21a0d | 4917 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
4918 | &rdev->dev.of_node); |
4919 | if (!init_data) { | |
4920 | init_data = config->init_data; | |
4921 | rdev->dev.of_node = of_node_get(config->of_node); | |
4922 | } | |
4923 | ||
f8702f9e | 4924 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 4925 | rdev->reg_data = config->driver_data; |
414c70cb LG |
4926 | rdev->owner = regulator_desc->owner; |
4927 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
4928 | if (config->regmap) |
4929 | rdev->regmap = config->regmap; | |
52b84dac | 4930 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 4931 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
4932 | else if (dev->parent) |
4933 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 4934 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 4935 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 4936 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 4937 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 4938 | |
a5766f11 | 4939 | /* preform any regulator specific init */ |
9a8f5e07 | 4940 | if (init_data && init_data->regulator_init) { |
a5766f11 | 4941 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
4942 | if (ret < 0) |
4943 | goto clean; | |
a5766f11 LG |
4944 | } |
4945 | ||
e45e290a LW |
4946 | if (config->ena_gpiod || |
4947 | ((config->ena_gpio || config->ena_gpio_initialized) && | |
4948 | gpio_is_valid(config->ena_gpio))) { | |
45389c47 | 4949 | mutex_lock(®ulator_list_mutex); |
daad134d | 4950 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 4951 | mutex_unlock(®ulator_list_mutex); |
daad134d KA |
4952 | if (ret != 0) { |
4953 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
4954 | config->ena_gpio, ret); | |
32165230 | 4955 | goto clean; |
daad134d KA |
4956 | } |
4957 | } | |
4958 | ||
a5766f11 | 4959 | /* register with sysfs */ |
414c70cb | 4960 | rdev->dev.class = ®ulator_class; |
a5766f11 | 4961 | rdev->dev.parent = dev; |
72dca06f | 4962 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 4963 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 4964 | |
74f544c1 | 4965 | /* set regulator constraints */ |
9a8f5e07 MB |
4966 | if (init_data) |
4967 | constraints = &init_data->constraints; | |
4968 | ||
9a8f5e07 | 4969 | if (init_data && init_data->supply_regulator) |
6261b06d | 4970 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 4971 | else if (regulator_desc->supply_name) |
6261b06d | 4972 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 4973 | |
45389c47 JH |
4974 | /* |
4975 | * Attempt to resolve the regulator supply, if specified, | |
4976 | * but don't return an error if we fail because we will try | |
4977 | * to resolve it again later as more regulators are added. | |
4978 | */ | |
4979 | if (regulator_resolve_supply(rdev)) | |
4980 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4981 | ||
4982 | ret = set_machine_constraints(rdev, constraints); | |
4983 | if (ret < 0) | |
4984 | goto wash; | |
4985 | ||
f9503385 DO |
4986 | ret = regulator_init_coupling(rdev); |
4987 | if (ret < 0) | |
d3d64537 MP |
4988 | goto wash; |
4989 | ||
a5766f11 | 4990 | /* add consumers devices */ |
9a8f5e07 | 4991 | if (init_data) { |
45389c47 | 4992 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
4993 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
4994 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 4995 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 4996 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 4997 | if (ret < 0) { |
45389c47 | 4998 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
4999 | dev_err(dev, "Failed to set supply %s\n", |
5000 | init_data->consumer_supplies[i].supply); | |
5001 | goto unset_supplies; | |
5002 | } | |
23c2f041 | 5003 | } |
45389c47 | 5004 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 5005 | } |
a5766f11 | 5006 | |
fd086045 MK |
5007 | if (!rdev->desc->ops->get_voltage && |
5008 | !rdev->desc->ops->list_voltage && | |
5009 | !rdev->desc->fixed_uV) | |
5010 | rdev->is_switch = true; | |
5011 | ||
fb6de923 | 5012 | dev_set_drvdata(&rdev->dev, rdev); |
c438b9d0 JH |
5013 | ret = device_register(&rdev->dev); |
5014 | if (ret != 0) { | |
5015 | put_device(&rdev->dev); | |
5016 | goto unset_supplies; | |
5017 | } | |
5018 | ||
1130e5b3 | 5019 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5020 | |
f9503385 DO |
5021 | /* try to resolve regulators coupling since a new one was registered */ |
5022 | mutex_lock(®ulator_list_mutex); | |
5023 | regulator_resolve_coupling(rdev); | |
5024 | mutex_unlock(®ulator_list_mutex); | |
5025 | ||
5e3ca2b3 JMC |
5026 | /* try to resolve regulators supply since a new one was registered */ |
5027 | class_for_each_device(®ulator_class, NULL, NULL, | |
5028 | regulator_register_resolve_supply); | |
1b3de223 | 5029 | kfree(config); |
414c70cb | 5030 | return rdev; |
4fca9545 | 5031 | |
d4033b54 | 5032 | unset_supplies: |
45389c47 | 5033 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5034 | unset_regulator_supplies(rdev); |
45389c47 | 5035 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5036 | wash: |
469b640e | 5037 | kfree(rdev->constraints); |
45389c47 | 5038 | mutex_lock(®ulator_list_mutex); |
32165230 | 5039 | regulator_ena_gpio_free(rdev); |
45389c47 | 5040 | mutex_unlock(®ulator_list_mutex); |
4fca9545 DB |
5041 | clean: |
5042 | kfree(rdev); | |
a2151374 JH |
5043 | kfree(config); |
5044 | return ERR_PTR(ret); | |
414c70cb LG |
5045 | } |
5046 | EXPORT_SYMBOL_GPL(regulator_register); | |
5047 | ||
5048 | /** | |
5049 | * regulator_unregister - unregister regulator | |
69279fb9 | 5050 | * @rdev: regulator to unregister |
414c70cb LG |
5051 | * |
5052 | * Called by regulator drivers to unregister a regulator. | |
5053 | */ | |
5054 | void regulator_unregister(struct regulator_dev *rdev) | |
5055 | { | |
5056 | if (rdev == NULL) | |
5057 | return; | |
5058 | ||
891636ea MB |
5059 | if (rdev->supply) { |
5060 | while (rdev->use_count--) | |
5061 | regulator_disable(rdev->supply); | |
e032b376 | 5062 | regulator_put(rdev->supply); |
891636ea | 5063 | } |
ff9b34b6 | 5064 | |
414c70cb | 5065 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5066 | |
1130e5b3 | 5067 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 5068 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 5069 | WARN_ON(rdev->open_count); |
6303f3e7 | 5070 | regulator_remove_coupling(rdev); |
0f1d747b | 5071 | unset_regulator_supplies(rdev); |
414c70cb | 5072 | list_del(&rdev->list); |
f19b00da | 5073 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5074 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5075 | |
5076 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5077 | } |
5078 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5079 | ||
f7efad10 | 5080 | #ifdef CONFIG_SUSPEND |
414c70cb | 5081 | /** |
0380cf7d | 5082 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5083 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5084 | * |
5085 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5086 | */ |
0380cf7d | 5087 | static int regulator_suspend(struct device *dev) |
414c70cb | 5088 | { |
cd7e36ab | 5089 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5090 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab MS |
5091 | int ret; |
5092 | ||
5093 | regulator_lock(rdev); | |
5094 | ret = suspend_set_state(rdev, state); | |
5095 | regulator_unlock(rdev); | |
414c70cb | 5096 | |
cd7e36ab | 5097 | return ret; |
85f3b431 | 5098 | } |
d3e4eccb | 5099 | |
cd7e36ab | 5100 | static int regulator_resume(struct device *dev) |
85f3b431 | 5101 | { |
cd7e36ab | 5102 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5103 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5104 | struct regulator_state *rstate; |
cd7e36ab | 5105 | int ret = 0; |
f7efad10 | 5106 | |
cd7e36ab | 5107 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5108 | if (rstate == NULL) |
35b5f14e | 5109 | return 0; |
414c70cb | 5110 | |
66cf9a7e | 5111 | regulator_lock(rdev); |
85f3b431 | 5112 | |
0380cf7d | 5113 | if (rdev->desc->ops->resume && |
f7efad10 CZ |
5114 | (rstate->enabled == ENABLE_IN_SUSPEND || |
5115 | rstate->enabled == DISABLE_IN_SUSPEND)) | |
0380cf7d | 5116 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5117 | |
66cf9a7e | 5118 | regulator_unlock(rdev); |
85f3b431 | 5119 | |
f7efad10 | 5120 | return ret; |
414c70cb | 5121 | } |
f7efad10 CZ |
5122 | #else /* !CONFIG_SUSPEND */ |
5123 | ||
0380cf7d | 5124 | #define regulator_suspend NULL |
5125 | #define regulator_resume NULL | |
f7efad10 CZ |
5126 | |
5127 | #endif /* !CONFIG_SUSPEND */ | |
5128 | ||
5129 | #ifdef CONFIG_PM | |
5130 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5131 | .suspend = regulator_suspend, |
5132 | .resume = regulator_resume, | |
f7efad10 CZ |
5133 | }; |
5134 | #endif | |
5135 | ||
285c22de | 5136 | struct class regulator_class = { |
f7efad10 CZ |
5137 | .name = "regulator", |
5138 | .dev_release = regulator_dev_release, | |
5139 | .dev_groups = regulator_dev_groups, | |
5140 | #ifdef CONFIG_PM | |
5141 | .pm = ®ulator_pm_ops, | |
5142 | #endif | |
5143 | }; | |
ca725561 MB |
5144 | /** |
5145 | * regulator_has_full_constraints - the system has fully specified constraints | |
5146 | * | |
5147 | * Calling this function will cause the regulator API to disable all | |
5148 | * regulators which have a zero use count and don't have an always_on | |
5149 | * constraint in a late_initcall. | |
5150 | * | |
5151 | * The intention is that this will become the default behaviour in a | |
5152 | * future kernel release so users are encouraged to use this facility | |
5153 | * now. | |
5154 | */ | |
5155 | void regulator_has_full_constraints(void) | |
5156 | { | |
5157 | has_full_constraints = 1; | |
5158 | } | |
5159 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5160 | ||
414c70cb LG |
5161 | /** |
5162 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5163 | * @rdev: regulator |
414c70cb LG |
5164 | * |
5165 | * Get rdev regulator driver private data. This call can be used in the | |
5166 | * regulator driver context. | |
5167 | */ | |
5168 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5169 | { | |
5170 | return rdev->reg_data; | |
5171 | } | |
5172 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5173 | ||
5174 | /** | |
5175 | * regulator_get_drvdata - get regulator driver data | |
5176 | * @regulator: regulator | |
5177 | * | |
5178 | * Get regulator driver private data. This call can be used in the consumer | |
5179 | * driver context when non API regulator specific functions need to be called. | |
5180 | */ | |
5181 | void *regulator_get_drvdata(struct regulator *regulator) | |
5182 | { | |
5183 | return regulator->rdev->reg_data; | |
5184 | } | |
5185 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5186 | ||
5187 | /** | |
5188 | * regulator_set_drvdata - set regulator driver data | |
5189 | * @regulator: regulator | |
5190 | * @data: data | |
5191 | */ | |
5192 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5193 | { | |
5194 | regulator->rdev->reg_data = data; | |
5195 | } | |
5196 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5197 | ||
5198 | /** | |
5199 | * regulator_get_id - get regulator ID | |
69279fb9 | 5200 | * @rdev: regulator |
414c70cb LG |
5201 | */ |
5202 | int rdev_get_id(struct regulator_dev *rdev) | |
5203 | { | |
5204 | return rdev->desc->id; | |
5205 | } | |
5206 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5207 | ||
a5766f11 LG |
5208 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5209 | { | |
5210 | return &rdev->dev; | |
5211 | } | |
5212 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5213 | ||
5214 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
5215 | { | |
5216 | return reg_init_data->driver_data; | |
5217 | } | |
5218 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5219 | ||
ba55a974 | 5220 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5221 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5222 | { |
ba55a974 MB |
5223 | struct regulator_map *map; |
5224 | ||
ba55a974 | 5225 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5226 | seq_printf(sf, "%s -> %s.%s\n", |
5227 | rdev_get_name(map->regulator), map->dev_name, | |
5228 | map->supply); | |
ba55a974 MB |
5229 | } |
5230 | ||
dbc55955 HZ |
5231 | return 0; |
5232 | } | |
ba55a974 | 5233 | |
dbc55955 HZ |
5234 | static int supply_map_open(struct inode *inode, struct file *file) |
5235 | { | |
5236 | return single_open(file, supply_map_show, inode->i_private); | |
ba55a974 | 5237 | } |
24751434 | 5238 | #endif |
ba55a974 MB |
5239 | |
5240 | static const struct file_operations supply_map_fops = { | |
24751434 | 5241 | #ifdef CONFIG_DEBUG_FS |
dbc55955 HZ |
5242 | .open = supply_map_open, |
5243 | .read = seq_read, | |
5244 | .llseek = seq_lseek, | |
5245 | .release = single_release, | |
ba55a974 | 5246 | #endif |
24751434 | 5247 | }; |
ba55a974 | 5248 | |
7c225ec9 | 5249 | #ifdef CONFIG_DEBUG_FS |
85f3b431 TV |
5250 | struct summary_data { |
5251 | struct seq_file *s; | |
5252 | struct regulator_dev *parent; | |
5253 | int level; | |
5254 | }; | |
5255 | ||
5256 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5257 | struct regulator_dev *rdev, | |
5258 | int level); | |
5259 | ||
5260 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5261 | { | |
5262 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5263 | struct summary_data *summary_data = data; | |
5264 | ||
5265 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5266 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5267 | summary_data->level + 1); | |
5268 | ||
5269 | return 0; | |
5270 | } | |
5271 | ||
7c225ec9 HS |
5272 | static void regulator_summary_show_subtree(struct seq_file *s, |
5273 | struct regulator_dev *rdev, | |
5274 | int level) | |
5275 | { | |
7c225ec9 HS |
5276 | struct regulation_constraints *c; |
5277 | struct regulator *consumer; | |
85f3b431 | 5278 | struct summary_data summary_data; |
7e4d9683 | 5279 | unsigned int opmode; |
7c225ec9 HS |
5280 | |
5281 | if (!rdev) | |
5282 | return; | |
5283 | ||
7e4d9683 | 5284 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5285 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5286 | level * 3 + 1, "", |
5287 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5288 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5289 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5290 | |
23296099 | 5291 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
7e4d9683 DA |
5292 | seq_printf(s, "%5dmA ", |
5293 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5294 | |
5295 | c = rdev->constraints; | |
5296 | if (c) { | |
5297 | switch (rdev->desc->type) { | |
5298 | case REGULATOR_VOLTAGE: | |
5299 | seq_printf(s, "%5dmV %5dmV ", | |
5300 | c->min_uV / 1000, c->max_uV / 1000); | |
5301 | break; | |
5302 | case REGULATOR_CURRENT: | |
5303 | seq_printf(s, "%5dmA %5dmA ", | |
5304 | c->min_uA / 1000, c->max_uA / 1000); | |
5305 | break; | |
5306 | } | |
5307 | } | |
5308 | ||
5309 | seq_puts(s, "\n"); | |
5310 | ||
5311 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5312 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5313 | continue; |
5314 | ||
5315 | seq_printf(s, "%*s%-*s ", | |
5316 | (level + 1) * 3 + 1, "", | |
e42a46b6 LC |
5317 | 30 - (level + 1) * 3, |
5318 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); | |
7c225ec9 HS |
5319 | |
5320 | switch (rdev->desc->type) { | |
5321 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5322 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5323 | consumer->enable_count, | |
7d3827b5 | 5324 | consumer->uA_load / 1000, |
5451781d DA |
5325 | consumer->uA_load && !consumer->enable_count ? |
5326 | '*' : ' ', | |
c360a6df CZ |
5327 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5328 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5329 | break; |
5330 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5331 | break; |
5332 | } | |
5333 | ||
5334 | seq_puts(s, "\n"); | |
5335 | } | |
5336 | ||
85f3b431 TV |
5337 | summary_data.s = s; |
5338 | summary_data.level = level; | |
5339 | summary_data.parent = rdev; | |
7c225ec9 | 5340 | |
85f3b431 TV |
5341 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5342 | regulator_summary_show_children); | |
f8702f9e DO |
5343 | } |
5344 | ||
5345 | struct summary_lock_data { | |
5346 | struct ww_acquire_ctx *ww_ctx; | |
5347 | struct regulator_dev **new_contended_rdev; | |
5348 | struct regulator_dev **old_contended_rdev; | |
5349 | }; | |
5350 | ||
5351 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5352 | { | |
5353 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5354 | struct summary_lock_data *lock_data = data; | |
5355 | int ret = 0; | |
5356 | ||
5357 | if (rdev != *lock_data->old_contended_rdev) { | |
5358 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5359 | ||
5360 | if (ret == -EDEADLK) | |
5361 | *lock_data->new_contended_rdev = rdev; | |
5362 | else | |
5363 | WARN_ON_ONCE(ret); | |
5364 | } else { | |
5365 | *lock_data->old_contended_rdev = NULL; | |
5366 | } | |
5367 | ||
5368 | return ret; | |
5369 | } | |
5370 | ||
5371 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5372 | { | |
5373 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5374 | struct summary_lock_data *lock_data = data; | |
5375 | ||
5376 | if (lock_data) { | |
5377 | if (rdev == *lock_data->new_contended_rdev) | |
5378 | return -EDEADLK; | |
5379 | } | |
7e4d9683 DA |
5380 | |
5381 | regulator_unlock(rdev); | |
f8702f9e DO |
5382 | |
5383 | return 0; | |
5384 | } | |
5385 | ||
5386 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5387 | struct regulator_dev **new_contended_rdev, | |
5388 | struct regulator_dev **old_contended_rdev) | |
5389 | { | |
5390 | struct summary_lock_data lock_data; | |
5391 | int ret; | |
5392 | ||
5393 | lock_data.ww_ctx = ww_ctx; | |
5394 | lock_data.new_contended_rdev = new_contended_rdev; | |
5395 | lock_data.old_contended_rdev = old_contended_rdev; | |
5396 | ||
5397 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5398 | regulator_summary_lock_one); | |
5399 | if (ret) | |
5400 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5401 | regulator_summary_unlock_one); | |
5402 | ||
5403 | return ret; | |
5404 | } | |
5405 | ||
5406 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5407 | { | |
5408 | struct regulator_dev *new_contended_rdev = NULL; | |
5409 | struct regulator_dev *old_contended_rdev = NULL; | |
5410 | int err; | |
5411 | ||
ff9b34b6 DO |
5412 | mutex_lock(®ulator_list_mutex); |
5413 | ||
f8702f9e DO |
5414 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5415 | ||
5416 | do { | |
5417 | if (new_contended_rdev) { | |
5418 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5419 | old_contended_rdev = new_contended_rdev; | |
5420 | old_contended_rdev->ref_cnt++; | |
5421 | } | |
5422 | ||
5423 | err = regulator_summary_lock_all(ww_ctx, | |
5424 | &new_contended_rdev, | |
5425 | &old_contended_rdev); | |
5426 | ||
5427 | if (old_contended_rdev) | |
5428 | regulator_unlock(old_contended_rdev); | |
5429 | ||
5430 | } while (err == -EDEADLK); | |
5431 | ||
5432 | ww_acquire_done(ww_ctx); | |
5433 | } | |
5434 | ||
5435 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5436 | { | |
5437 | class_for_each_device(®ulator_class, NULL, NULL, | |
5438 | regulator_summary_unlock_one); | |
5439 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5440 | |
5441 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5442 | } |
5443 | ||
85f3b431 | 5444 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5445 | { |
85f3b431 TV |
5446 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5447 | struct seq_file *s = data; | |
7c225ec9 | 5448 | |
85f3b431 TV |
5449 | if (!rdev->supply) |
5450 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5451 | |
85f3b431 TV |
5452 | return 0; |
5453 | } | |
7c225ec9 | 5454 | |
85f3b431 TV |
5455 | static int regulator_summary_show(struct seq_file *s, void *data) |
5456 | { | |
f8702f9e DO |
5457 | struct ww_acquire_ctx ww_ctx; |
5458 | ||
01de19d0 DA |
5459 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5460 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5461 | |
f8702f9e DO |
5462 | regulator_summary_lock(&ww_ctx); |
5463 | ||
85f3b431 TV |
5464 | class_for_each_device(®ulator_class, NULL, s, |
5465 | regulator_summary_show_roots); | |
7c225ec9 | 5466 | |
f8702f9e DO |
5467 | regulator_summary_unlock(&ww_ctx); |
5468 | ||
7c225ec9 HS |
5469 | return 0; |
5470 | } | |
5471 | ||
5472 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
5473 | { | |
5474 | return single_open(file, regulator_summary_show, inode->i_private); | |
5475 | } | |
5476 | #endif | |
5477 | ||
5478 | static const struct file_operations regulator_summary_fops = { | |
5479 | #ifdef CONFIG_DEBUG_FS | |
5480 | .open = regulator_summary_open, | |
5481 | .read = seq_read, | |
5482 | .llseek = seq_lseek, | |
5483 | .release = single_release, | |
5484 | #endif | |
5485 | }; | |
5486 | ||
414c70cb LG |
5487 | static int __init regulator_init(void) |
5488 | { | |
34abbd68 MB |
5489 | int ret; |
5490 | ||
34abbd68 MB |
5491 | ret = class_register(®ulator_class); |
5492 | ||
1130e5b3 | 5493 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5494 | if (!debugfs_root) |
1130e5b3 | 5495 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5496 | |
f4d562c6 MB |
5497 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5498 | &supply_map_fops); | |
1130e5b3 | 5499 | |
7c225ec9 | 5500 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5501 | NULL, ®ulator_summary_fops); |
7c225ec9 | 5502 | |
34abbd68 MB |
5503 | regulator_dummy_init(); |
5504 | ||
5505 | return ret; | |
414c70cb LG |
5506 | } |
5507 | ||
5508 | /* init early to allow our consumers to complete system booting */ | |
5509 | core_initcall(regulator_init); | |
ca725561 | 5510 | |
609ca5f3 | 5511 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5512 | { |
609ca5f3 MB |
5513 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5514 | const struct regulator_ops *ops = rdev->desc->ops; | |
5515 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5516 | int enabled, ret; |
ca725561 | 5517 | |
609ca5f3 MB |
5518 | if (c && c->always_on) |
5519 | return 0; | |
5520 | ||
8a34e979 | 5521 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5522 | return 0; |
5523 | ||
66cf9a7e | 5524 | regulator_lock(rdev); |
609ca5f3 MB |
5525 | |
5526 | if (rdev->use_count) | |
5527 | goto unlock; | |
5528 | ||
5529 | /* If we can't read the status assume it's on. */ | |
5530 | if (ops->is_enabled) | |
5531 | enabled = ops->is_enabled(rdev); | |
5532 | else | |
5533 | enabled = 1; | |
5534 | ||
5535 | if (!enabled) | |
5536 | goto unlock; | |
5537 | ||
5538 | if (have_full_constraints()) { | |
5539 | /* We log since this may kill the system if it goes | |
5540 | * wrong. */ | |
5541 | rdev_info(rdev, "disabling\n"); | |
5542 | ret = _regulator_do_disable(rdev); | |
5543 | if (ret != 0) | |
5544 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
5545 | } else { | |
5546 | /* The intention is that in future we will | |
5547 | * assume that full constraints are provided | |
5548 | * so warn even if we aren't going to do | |
5549 | * anything here. | |
5550 | */ | |
5551 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5552 | } | |
5553 | ||
5554 | unlock: | |
66cf9a7e | 5555 | regulator_unlock(rdev); |
609ca5f3 MB |
5556 | |
5557 | return 0; | |
5558 | } | |
5559 | ||
5560 | static int __init regulator_init_complete(void) | |
5561 | { | |
86f5fcfc MB |
5562 | /* |
5563 | * Since DT doesn't provide an idiomatic mechanism for | |
5564 | * enabling full constraints and since it's much more natural | |
5565 | * with DT to provide them just assume that a DT enabled | |
5566 | * system has full constraints. | |
5567 | */ | |
5568 | if (of_have_populated_dt()) | |
5569 | has_full_constraints = true; | |
5570 | ||
3827b64d JMC |
5571 | /* |
5572 | * Regulators may had failed to resolve their input supplies | |
5573 | * when were registered, either because the input supply was | |
5574 | * not registered yet or because its parent device was not | |
5575 | * bound yet. So attempt to resolve the input supplies for | |
5576 | * pending regulators before trying to disable unused ones. | |
5577 | */ | |
5578 | class_for_each_device(®ulator_class, NULL, NULL, | |
5579 | regulator_register_resolve_supply); | |
5580 | ||
ca725561 | 5581 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5582 | * we have permission to change the status for and which are |
5583 | * not in use or always_on. This is effectively the default | |
5584 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5585 | */ |
609ca5f3 MB |
5586 | class_for_each_device(®ulator_class, NULL, NULL, |
5587 | regulator_late_cleanup); | |
ca725561 MB |
5588 | |
5589 | return 0; | |
5590 | } | |
fd482a3e | 5591 | late_initcall_sync(regulator_init_complete); |