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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f2c6203f MB |
2 | // |
3 | // core.c -- Voltage/Current Regulator framework. | |
4 | // | |
5 | // Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
6 | // Copyright 2008 SlimLogic Ltd. | |
7 | // | |
8 | // Author: Liam Girdwood <lrg@slimlogic.co.uk> | |
414c70cb LG |
9 | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
1130e5b3 | 12 | #include <linux/debugfs.h> |
414c70cb | 13 | #include <linux/device.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
f21e0e81 | 15 | #include <linux/async.h> |
414c70cb LG |
16 | #include <linux/err.h> |
17 | #include <linux/mutex.h> | |
18 | #include <linux/suspend.h> | |
31aae2be | 19 | #include <linux/delay.h> |
778b28b4 | 20 | #include <linux/gpio/consumer.h> |
69511a45 | 21 | #include <linux/of.h> |
65b19ce6 | 22 | #include <linux/regmap.h> |
69511a45 | 23 | #include <linux/regulator/of_regulator.h> |
414c70cb | 24 | #include <linux/regulator/consumer.h> |
d8ca7d18 | 25 | #include <linux/regulator/coupler.h> |
414c70cb LG |
26 | #include <linux/regulator/driver.h> |
27 | #include <linux/regulator/machine.h> | |
65602c32 | 28 | #include <linux/module.h> |
414c70cb | 29 | |
02fa3ec0 MB |
30 | #define CREATE_TRACE_POINTS |
31 | #include <trace/events/regulator.h> | |
32 | ||
34abbd68 | 33 | #include "dummy.h" |
0cdfcc0f | 34 | #include "internal.h" |
34abbd68 | 35 | |
7d51a0db MB |
36 | #define rdev_crit(rdev, fmt, ...) \ |
37 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
38 | #define rdev_err(rdev, fmt, ...) \ |
39 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
40 | #define rdev_warn(rdev, fmt, ...) \ | |
41 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
42 | #define rdev_info(rdev, fmt, ...) \ | |
43 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
44 | #define rdev_dbg(rdev, fmt, ...) \ | |
45 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | ||
f8702f9e DO |
47 | static DEFINE_WW_CLASS(regulator_ww_class); |
48 | static DEFINE_MUTEX(regulator_nesting_mutex); | |
414c70cb | 49 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 50 | static LIST_HEAD(regulator_map_list); |
f19b00da | 51 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 52 | static LIST_HEAD(regulator_supply_alias_list); |
d8ca7d18 | 53 | static LIST_HEAD(regulator_coupler_list); |
21cf891a | 54 | static bool has_full_constraints; |
414c70cb | 55 | |
1130e5b3 | 56 | static struct dentry *debugfs_root; |
1130e5b3 | 57 | |
8dc5390d | 58 | /* |
414c70cb LG |
59 | * struct regulator_map |
60 | * | |
61 | * Used to provide symbolic supply names to devices. | |
62 | */ | |
63 | struct regulator_map { | |
64 | struct list_head list; | |
40f9244f | 65 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 66 | const char *supply; |
a5766f11 | 67 | struct regulator_dev *regulator; |
414c70cb LG |
68 | }; |
69 | ||
f19b00da KM |
70 | /* |
71 | * struct regulator_enable_gpio | |
72 | * | |
73 | * Management for shared enable GPIO pin | |
74 | */ | |
75 | struct regulator_enable_gpio { | |
76 | struct list_head list; | |
778b28b4 | 77 | struct gpio_desc *gpiod; |
f19b00da KM |
78 | u32 enable_count; /* a number of enabled shared GPIO */ |
79 | u32 request_count; /* a number of requested shared GPIO */ | |
f19b00da KM |
80 | }; |
81 | ||
a06ccd9c CK |
82 | /* |
83 | * struct regulator_supply_alias | |
84 | * | |
85 | * Used to map lookups for a supply onto an alternative device. | |
86 | */ | |
87 | struct regulator_supply_alias { | |
88 | struct list_head list; | |
89 | struct device *src_dev; | |
90 | const char *src_supply; | |
91 | struct device *alias_dev; | |
92 | const char *alias_supply; | |
93 | }; | |
94 | ||
414c70cb | 95 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
5451781d | 96 | static int _regulator_disable(struct regulator *regulator); |
414c70cb LG |
97 | static int _regulator_get_current_limit(struct regulator_dev *rdev); |
98 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 99 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 100 | unsigned long event, void *data); |
75790251 MB |
101 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
102 | int min_uV, int max_uV); | |
c054c6c7 MP |
103 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
104 | suspend_state_t state); | |
3801b86a MB |
105 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
106 | struct device *dev, | |
107 | const char *supply_name); | |
e1794aa4 | 108 | static void destroy_regulator(struct regulator *regulator); |
36a1f1b6 | 109 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 110 | |
d22b85a1 | 111 | const char *rdev_get_name(struct regulator_dev *rdev) |
1083c393 MB |
112 | { |
113 | if (rdev->constraints && rdev->constraints->name) | |
114 | return rdev->constraints->name; | |
115 | else if (rdev->desc->name) | |
116 | return rdev->desc->name; | |
117 | else | |
118 | return ""; | |
119 | } | |
120 | ||
87b28417 MB |
121 | static bool have_full_constraints(void) |
122 | { | |
75bc9641 | 123 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
124 | } |
125 | ||
8a34e979 WP |
126 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
127 | { | |
128 | if (!rdev->constraints) { | |
129 | rdev_err(rdev, "no constraints\n"); | |
130 | return false; | |
131 | } | |
132 | ||
133 | if (rdev->constraints->valid_ops_mask & ops) | |
134 | return true; | |
135 | ||
136 | return false; | |
137 | } | |
138 | ||
66cf9a7e MP |
139 | /** |
140 | * regulator_lock_nested - lock a single regulator | |
141 | * @rdev: regulator source | |
f8702f9e | 142 | * @ww_ctx: w/w mutex acquire context |
66cf9a7e MP |
143 | * |
144 | * This function can be called many times by one task on | |
145 | * a single regulator and its mutex will be locked only | |
146 | * once. If a task, which is calling this function is other | |
147 | * than the one, which initially locked the mutex, it will | |
148 | * wait on mutex. | |
149 | */ | |
f8702f9e DO |
150 | static inline int regulator_lock_nested(struct regulator_dev *rdev, |
151 | struct ww_acquire_ctx *ww_ctx) | |
66cf9a7e | 152 | { |
f8702f9e DO |
153 | bool lock = false; |
154 | int ret = 0; | |
155 | ||
156 | mutex_lock(®ulator_nesting_mutex); | |
157 | ||
158 | if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) { | |
159 | if (rdev->mutex_owner == current) | |
66cf9a7e | 160 | rdev->ref_cnt++; |
f8702f9e DO |
161 | else |
162 | lock = true; | |
163 | ||
164 | if (lock) { | |
165 | mutex_unlock(®ulator_nesting_mutex); | |
166 | ret = ww_mutex_lock(&rdev->mutex, ww_ctx); | |
167 | mutex_lock(®ulator_nesting_mutex); | |
66cf9a7e | 168 | } |
f8702f9e DO |
169 | } else { |
170 | lock = true; | |
66cf9a7e MP |
171 | } |
172 | ||
f8702f9e DO |
173 | if (lock && ret != -EDEADLK) { |
174 | rdev->ref_cnt++; | |
175 | rdev->mutex_owner = current; | |
176 | } | |
177 | ||
178 | mutex_unlock(®ulator_nesting_mutex); | |
179 | ||
180 | return ret; | |
66cf9a7e MP |
181 | } |
182 | ||
f8702f9e DO |
183 | /** |
184 | * regulator_lock - lock a single regulator | |
185 | * @rdev: regulator source | |
186 | * | |
187 | * This function can be called many times by one task on | |
188 | * a single regulator and its mutex will be locked only | |
189 | * once. If a task, which is calling this function is other | |
190 | * than the one, which initially locked the mutex, it will | |
191 | * wait on mutex. | |
192 | */ | |
4c9db393 | 193 | static void regulator_lock(struct regulator_dev *rdev) |
66cf9a7e | 194 | { |
f8702f9e | 195 | regulator_lock_nested(rdev, NULL); |
66cf9a7e MP |
196 | } |
197 | ||
198 | /** | |
199 | * regulator_unlock - unlock a single regulator | |
200 | * @rdev: regulator_source | |
201 | * | |
202 | * This function unlocks the mutex when the | |
203 | * reference counter reaches 0. | |
204 | */ | |
4c9db393 | 205 | static void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 206 | { |
f8702f9e | 207 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 208 | |
f8702f9e DO |
209 | if (--rdev->ref_cnt == 0) { |
210 | rdev->mutex_owner = NULL; | |
211 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 212 | } |
f8702f9e DO |
213 | |
214 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
215 | ||
216 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e MP |
217 | } |
218 | ||
089e2cc2 | 219 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 220 | { |
089e2cc2 DO |
221 | struct regulator_dev *c_rdev; |
222 | int i; | |
223 | ||
224 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
225 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 226 | |
089e2cc2 DO |
227 | if (rdev->supply->rdev == c_rdev) |
228 | return true; | |
229 | } | |
230 | ||
231 | return false; | |
232 | } | |
233 | ||
f8702f9e DO |
234 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
235 | unsigned int n_coupled) | |
9f01cd4a | 236 | { |
9243a195 | 237 | struct regulator_dev *c_rdev; |
fa731ac7 | 238 | int i; |
9f01cd4a | 239 | |
f8702f9e DO |
240 | for (i = n_coupled; i > 0; i--) { |
241 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
242 | |
243 | if (!c_rdev) | |
244 | continue; | |
245 | ||
089e2cc2 | 246 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) |
f8702f9e DO |
247 | regulator_unlock_recursive( |
248 | c_rdev->supply->rdev, | |
249 | c_rdev->coupling_desc.n_coupled); | |
9243a195 | 250 | |
f8702f9e DO |
251 | regulator_unlock(c_rdev); |
252 | } | |
9f01cd4a SH |
253 | } |
254 | ||
f8702f9e DO |
255 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
256 | struct regulator_dev **new_contended_rdev, | |
257 | struct regulator_dev **old_contended_rdev, | |
258 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 259 | { |
9243a195 | 260 | struct regulator_dev *c_rdev; |
f8702f9e | 261 | int i, err; |
9f01cd4a | 262 | |
9243a195 MP |
263 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
264 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 265 | |
9243a195 MP |
266 | if (!c_rdev) |
267 | continue; | |
9f01cd4a | 268 | |
f8702f9e DO |
269 | if (c_rdev != *old_contended_rdev) { |
270 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
271 | if (err) { | |
272 | if (err == -EDEADLK) { | |
273 | *new_contended_rdev = c_rdev; | |
274 | goto err_unlock; | |
275 | } | |
9243a195 | 276 | |
f8702f9e DO |
277 | /* shouldn't happen */ |
278 | WARN_ON_ONCE(err != -EALREADY); | |
279 | } | |
280 | } else { | |
281 | *old_contended_rdev = NULL; | |
282 | } | |
283 | ||
089e2cc2 | 284 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
285 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
286 | new_contended_rdev, | |
287 | old_contended_rdev, | |
288 | ww_ctx); | |
289 | if (err) { | |
290 | regulator_unlock(c_rdev); | |
291 | goto err_unlock; | |
292 | } | |
66cf9a7e MP |
293 | } |
294 | } | |
f8702f9e DO |
295 | |
296 | return 0; | |
297 | ||
298 | err_unlock: | |
299 | regulator_unlock_recursive(rdev, i); | |
300 | ||
301 | return err; | |
66cf9a7e MP |
302 | } |
303 | ||
38de19fa | 304 | /** |
f8702f9e DO |
305 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
306 | * regulators | |
307 | * @rdev: regulator source | |
308 | * @ww_ctx: w/w mutex acquire context | |
309 | * | |
48f1b4ef | 310 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 311 | */ |
f8702f9e DO |
312 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
313 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 314 | { |
f8702f9e DO |
315 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
316 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
317 | } |
318 | ||
319 | /** | |
9243a195 MP |
320 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
321 | * @rdev: regulator source | |
f8702f9e | 322 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
323 | * |
324 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 325 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 326 | */ |
f8702f9e DO |
327 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
328 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 329 | { |
f8702f9e DO |
330 | struct regulator_dev *new_contended_rdev = NULL; |
331 | struct regulator_dev *old_contended_rdev = NULL; | |
332 | int err; | |
9f01cd4a | 333 | |
f8702f9e | 334 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 335 | |
f8702f9e | 336 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 337 | |
f8702f9e DO |
338 | do { |
339 | if (new_contended_rdev) { | |
340 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
341 | old_contended_rdev = new_contended_rdev; | |
342 | old_contended_rdev->ref_cnt++; | |
343 | } | |
344 | ||
345 | err = regulator_lock_recursive(rdev, | |
346 | &new_contended_rdev, | |
347 | &old_contended_rdev, | |
348 | ww_ctx); | |
349 | ||
350 | if (old_contended_rdev) | |
351 | regulator_unlock(old_contended_rdev); | |
352 | ||
353 | } while (err == -EDEADLK); | |
354 | ||
355 | ww_acquire_done(ww_ctx); | |
356 | ||
357 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
358 | } |
359 | ||
fe06051d | 360 | /** |
361 | * of_get_child_regulator - get a child regulator device node | |
362 | * based on supply name | |
363 | * @parent: Parent device node | |
364 | * @prop_name: Combination regulator supply name and "-supply" | |
365 | * | |
366 | * Traverse all child nodes. | |
367 | * Extract the child regulator device node corresponding to the supply name. | |
368 | * returns the device node corresponding to the regulator if found, else | |
369 | * returns NULL. | |
370 | */ | |
371 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
372 | const char *prop_name) | |
373 | { | |
374 | struct device_node *regnode = NULL; | |
375 | struct device_node *child = NULL; | |
376 | ||
377 | for_each_child_of_node(parent, child) { | |
378 | regnode = of_parse_phandle(child, prop_name, 0); | |
379 | ||
380 | if (!regnode) { | |
381 | regnode = of_get_child_regulator(child, prop_name); | |
81eeb0a3 ND |
382 | if (regnode) |
383 | goto err_node_put; | |
fe06051d | 384 | } else { |
81eeb0a3 | 385 | goto err_node_put; |
fe06051d | 386 | } |
387 | } | |
388 | return NULL; | |
81eeb0a3 ND |
389 | |
390 | err_node_put: | |
391 | of_node_put(child); | |
392 | return regnode; | |
fe06051d | 393 | } |
394 | ||
69511a45 RN |
395 | /** |
396 | * of_get_regulator - get a regulator device node based on supply name | |
397 | * @dev: Device pointer for the consumer (of regulator) device | |
398 | * @supply: regulator supply name | |
399 | * | |
400 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 401 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
402 | * returns NULL. |
403 | */ | |
404 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
405 | { | |
406 | struct device_node *regnode = NULL; | |
407 | char prop_name[32]; /* 32 is max size of property name */ | |
408 | ||
409 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
410 | ||
411 | snprintf(prop_name, 32, "%s-supply", supply); | |
412 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
413 | ||
414 | if (!regnode) { | |
fe06051d | 415 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
416 | if (regnode) | |
417 | return regnode; | |
418 | ||
7799167b RH |
419 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
420 | prop_name, dev->of_node); | |
69511a45 RN |
421 | return NULL; |
422 | } | |
423 | return regnode; | |
424 | } | |
425 | ||
414c70cb | 426 | /* Platform voltage constraint check */ |
d22b85a1 DO |
427 | int regulator_check_voltage(struct regulator_dev *rdev, |
428 | int *min_uV, int *max_uV) | |
414c70cb LG |
429 | { |
430 | BUG_ON(*min_uV > *max_uV); | |
431 | ||
8a34e979 | 432 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 433 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
434 | return -EPERM; |
435 | } | |
436 | ||
437 | if (*max_uV > rdev->constraints->max_uV) | |
438 | *max_uV = rdev->constraints->max_uV; | |
439 | if (*min_uV < rdev->constraints->min_uV) | |
440 | *min_uV = rdev->constraints->min_uV; | |
441 | ||
89f425ed MB |
442 | if (*min_uV > *max_uV) { |
443 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 444 | *min_uV, *max_uV); |
414c70cb | 445 | return -EINVAL; |
89f425ed | 446 | } |
414c70cb LG |
447 | |
448 | return 0; | |
449 | } | |
450 | ||
f7efad10 CZ |
451 | /* return 0 if the state is valid */ |
452 | static int regulator_check_states(suspend_state_t state) | |
453 | { | |
454 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
455 | } | |
456 | ||
05fda3b1 TP |
457 | /* Make sure we select a voltage that suits the needs of all |
458 | * regulator consumers | |
459 | */ | |
d22b85a1 DO |
460 | int regulator_check_consumers(struct regulator_dev *rdev, |
461 | int *min_uV, int *max_uV, | |
462 | suspend_state_t state) | |
05fda3b1 TP |
463 | { |
464 | struct regulator *regulator; | |
c360a6df | 465 | struct regulator_voltage *voltage; |
05fda3b1 TP |
466 | |
467 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 468 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
469 | /* |
470 | * Assume consumers that didn't say anything are OK | |
471 | * with anything in the constraint range. | |
472 | */ | |
c360a6df | 473 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
474 | continue; |
475 | ||
c360a6df CZ |
476 | if (*max_uV > voltage->max_uV) |
477 | *max_uV = voltage->max_uV; | |
478 | if (*min_uV < voltage->min_uV) | |
479 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
480 | } |
481 | ||
dd8004af | 482 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
483 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
484 | *min_uV, *max_uV); | |
05fda3b1 | 485 | return -EINVAL; |
dd8004af | 486 | } |
05fda3b1 TP |
487 | |
488 | return 0; | |
489 | } | |
490 | ||
414c70cb LG |
491 | /* current constraint check */ |
492 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
493 | int *min_uA, int *max_uA) | |
494 | { | |
495 | BUG_ON(*min_uA > *max_uA); | |
496 | ||
8a34e979 | 497 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 498 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
499 | return -EPERM; |
500 | } | |
501 | ||
502 | if (*max_uA > rdev->constraints->max_uA) | |
503 | *max_uA = rdev->constraints->max_uA; | |
504 | if (*min_uA < rdev->constraints->min_uA) | |
505 | *min_uA = rdev->constraints->min_uA; | |
506 | ||
89f425ed MB |
507 | if (*min_uA > *max_uA) { |
508 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 509 | *min_uA, *max_uA); |
414c70cb | 510 | return -EINVAL; |
89f425ed | 511 | } |
414c70cb LG |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* operating mode constraint check */ | |
109c75af CK |
517 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
518 | unsigned int *mode) | |
414c70cb | 519 | { |
2c608234 | 520 | switch (*mode) { |
e573520b DB |
521 | case REGULATOR_MODE_FAST: |
522 | case REGULATOR_MODE_NORMAL: | |
523 | case REGULATOR_MODE_IDLE: | |
524 | case REGULATOR_MODE_STANDBY: | |
525 | break; | |
526 | default: | |
89f425ed | 527 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
528 | return -EINVAL; |
529 | } | |
530 | ||
8a34e979 | 531 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 532 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
533 | return -EPERM; |
534 | } | |
2c608234 MB |
535 | |
536 | /* The modes are bitmasks, the most power hungry modes having | |
537 | * the lowest values. If the requested mode isn't supported | |
538 | * try higher modes. */ | |
539 | while (*mode) { | |
540 | if (rdev->constraints->valid_modes_mask & *mode) | |
541 | return 0; | |
542 | *mode /= 2; | |
414c70cb | 543 | } |
2c608234 MB |
544 | |
545 | return -EINVAL; | |
414c70cb LG |
546 | } |
547 | ||
f7efad10 CZ |
548 | static inline struct regulator_state * |
549 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
550 | { | |
551 | if (rdev->constraints == NULL) | |
552 | return NULL; | |
553 | ||
554 | switch (state) { | |
555 | case PM_SUSPEND_STANDBY: | |
556 | return &rdev->constraints->state_standby; | |
557 | case PM_SUSPEND_MEM: | |
558 | return &rdev->constraints->state_mem; | |
559 | case PM_SUSPEND_MAX: | |
560 | return &rdev->constraints->state_disk; | |
561 | default: | |
562 | return NULL; | |
563 | } | |
564 | } | |
565 | ||
0955f5be SB |
566 | static const struct regulator_state * |
567 | regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state) | |
568 | { | |
569 | const struct regulator_state *rstate; | |
570 | ||
571 | rstate = regulator_get_suspend_state(rdev, state); | |
572 | if (rstate == NULL) | |
573 | return NULL; | |
574 | ||
575 | /* If we have no suspend mode configuration don't set anything; | |
576 | * only warn if the driver implements set_suspend_voltage or | |
577 | * set_suspend_mode callback. | |
578 | */ | |
579 | if (rstate->enabled != ENABLE_IN_SUSPEND && | |
580 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
581 | if (rdev->desc->ops->set_suspend_voltage || | |
582 | rdev->desc->ops->set_suspend_mode) | |
583 | rdev_warn(rdev, "No configuration\n"); | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | return rstate; | |
588 | } | |
589 | ||
414c70cb LG |
590 | static ssize_t regulator_uV_show(struct device *dev, |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
a5766f11 | 593 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
c82f27df | 594 | int uV; |
414c70cb | 595 | |
66cf9a7e | 596 | regulator_lock(rdev); |
c82f27df | 597 | uV = regulator_get_voltage_rdev(rdev); |
66cf9a7e | 598 | regulator_unlock(rdev); |
414c70cb | 599 | |
c82f27df NS |
600 | if (uV < 0) |
601 | return uV; | |
602 | return sprintf(buf, "%d\n", uV); | |
414c70cb | 603 | } |
7ad68e2f | 604 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
605 | |
606 | static ssize_t regulator_uA_show(struct device *dev, | |
607 | struct device_attribute *attr, char *buf) | |
608 | { | |
a5766f11 | 609 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
610 | |
611 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
612 | } | |
7ad68e2f | 613 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 614 | |
587cea27 GKH |
615 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
616 | char *buf) | |
bc558a60 MB |
617 | { |
618 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 619 | |
1083c393 | 620 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 621 | } |
587cea27 | 622 | static DEVICE_ATTR_RO(name); |
bc558a60 | 623 | |
01de19d0 | 624 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 625 | { |
414c70cb LG |
626 | switch (mode) { |
627 | case REGULATOR_MODE_FAST: | |
01de19d0 | 628 | return "fast"; |
414c70cb | 629 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 630 | return "normal"; |
414c70cb | 631 | case REGULATOR_MODE_IDLE: |
01de19d0 | 632 | return "idle"; |
414c70cb | 633 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 634 | return "standby"; |
414c70cb | 635 | } |
01de19d0 DA |
636 | return "unknown"; |
637 | } | |
638 | ||
639 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
640 | { | |
641 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
642 | } |
643 | ||
4fca9545 DB |
644 | static ssize_t regulator_opmode_show(struct device *dev, |
645 | struct device_attribute *attr, char *buf) | |
414c70cb | 646 | { |
a5766f11 | 647 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 648 | |
4fca9545 DB |
649 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
650 | } | |
7ad68e2f | 651 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
652 | |
653 | static ssize_t regulator_print_state(char *buf, int state) | |
654 | { | |
414c70cb LG |
655 | if (state > 0) |
656 | return sprintf(buf, "enabled\n"); | |
657 | else if (state == 0) | |
658 | return sprintf(buf, "disabled\n"); | |
659 | else | |
660 | return sprintf(buf, "unknown\n"); | |
661 | } | |
662 | ||
4fca9545 DB |
663 | static ssize_t regulator_state_show(struct device *dev, |
664 | struct device_attribute *attr, char *buf) | |
665 | { | |
666 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
667 | ssize_t ret; |
668 | ||
66cf9a7e | 669 | regulator_lock(rdev); |
9332546f | 670 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 671 | regulator_unlock(rdev); |
4fca9545 | 672 | |
9332546f | 673 | return ret; |
4fca9545 | 674 | } |
7ad68e2f | 675 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 676 | |
853116a1 DB |
677 | static ssize_t regulator_status_show(struct device *dev, |
678 | struct device_attribute *attr, char *buf) | |
679 | { | |
680 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
681 | int status; | |
682 | char *label; | |
683 | ||
684 | status = rdev->desc->ops->get_status(rdev); | |
685 | if (status < 0) | |
686 | return status; | |
687 | ||
688 | switch (status) { | |
689 | case REGULATOR_STATUS_OFF: | |
690 | label = "off"; | |
691 | break; | |
692 | case REGULATOR_STATUS_ON: | |
693 | label = "on"; | |
694 | break; | |
695 | case REGULATOR_STATUS_ERROR: | |
696 | label = "error"; | |
697 | break; | |
698 | case REGULATOR_STATUS_FAST: | |
699 | label = "fast"; | |
700 | break; | |
701 | case REGULATOR_STATUS_NORMAL: | |
702 | label = "normal"; | |
703 | break; | |
704 | case REGULATOR_STATUS_IDLE: | |
705 | label = "idle"; | |
706 | break; | |
707 | case REGULATOR_STATUS_STANDBY: | |
708 | label = "standby"; | |
709 | break; | |
f59c8f9f MB |
710 | case REGULATOR_STATUS_BYPASS: |
711 | label = "bypass"; | |
712 | break; | |
1beaf762 KG |
713 | case REGULATOR_STATUS_UNDEFINED: |
714 | label = "undefined"; | |
715 | break; | |
853116a1 DB |
716 | default: |
717 | return -ERANGE; | |
718 | } | |
719 | ||
720 | return sprintf(buf, "%s\n", label); | |
721 | } | |
722 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
723 | ||
414c70cb LG |
724 | static ssize_t regulator_min_uA_show(struct device *dev, |
725 | struct device_attribute *attr, char *buf) | |
726 | { | |
a5766f11 | 727 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
728 | |
729 | if (!rdev->constraints) | |
730 | return sprintf(buf, "constraint not defined\n"); | |
731 | ||
732 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
733 | } | |
7ad68e2f | 734 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
735 | |
736 | static ssize_t regulator_max_uA_show(struct device *dev, | |
737 | struct device_attribute *attr, char *buf) | |
738 | { | |
a5766f11 | 739 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
740 | |
741 | if (!rdev->constraints) | |
742 | return sprintf(buf, "constraint not defined\n"); | |
743 | ||
744 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
745 | } | |
7ad68e2f | 746 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
747 | |
748 | static ssize_t regulator_min_uV_show(struct device *dev, | |
749 | struct device_attribute *attr, char *buf) | |
750 | { | |
a5766f11 | 751 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
752 | |
753 | if (!rdev->constraints) | |
754 | return sprintf(buf, "constraint not defined\n"); | |
755 | ||
756 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
757 | } | |
7ad68e2f | 758 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
759 | |
760 | static ssize_t regulator_max_uV_show(struct device *dev, | |
761 | struct device_attribute *attr, char *buf) | |
762 | { | |
a5766f11 | 763 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
764 | |
765 | if (!rdev->constraints) | |
766 | return sprintf(buf, "constraint not defined\n"); | |
767 | ||
768 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
769 | } | |
7ad68e2f | 770 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
771 | |
772 | static ssize_t regulator_total_uA_show(struct device *dev, | |
773 | struct device_attribute *attr, char *buf) | |
774 | { | |
a5766f11 | 775 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
776 | struct regulator *regulator; |
777 | int uA = 0; | |
778 | ||
66cf9a7e | 779 | regulator_lock(rdev); |
5451781d DA |
780 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
781 | if (regulator->enable_count) | |
782 | uA += regulator->uA_load; | |
783 | } | |
66cf9a7e | 784 | regulator_unlock(rdev); |
414c70cb LG |
785 | return sprintf(buf, "%d\n", uA); |
786 | } | |
7ad68e2f | 787 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 788 | |
587cea27 GKH |
789 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
790 | char *buf) | |
414c70cb | 791 | { |
a5766f11 | 792 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
793 | return sprintf(buf, "%d\n", rdev->use_count); |
794 | } | |
587cea27 | 795 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 796 | |
587cea27 GKH |
797 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
798 | char *buf) | |
414c70cb | 799 | { |
a5766f11 | 800 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
801 | |
802 | switch (rdev->desc->type) { | |
803 | case REGULATOR_VOLTAGE: | |
804 | return sprintf(buf, "voltage\n"); | |
805 | case REGULATOR_CURRENT: | |
806 | return sprintf(buf, "current\n"); | |
807 | } | |
808 | return sprintf(buf, "unknown\n"); | |
809 | } | |
587cea27 | 810 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
811 | |
812 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
813 | struct device_attribute *attr, char *buf) | |
814 | { | |
a5766f11 | 815 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 816 | |
414c70cb LG |
817 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
818 | } | |
7ad68e2f DB |
819 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
820 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
821 | |
822 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
823 | struct device_attribute *attr, char *buf) | |
824 | { | |
a5766f11 | 825 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 826 | |
414c70cb LG |
827 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
828 | } | |
7ad68e2f DB |
829 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
830 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
831 | |
832 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
833 | struct device_attribute *attr, char *buf) | |
834 | { | |
a5766f11 | 835 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 836 | |
414c70cb LG |
837 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
838 | } | |
7ad68e2f DB |
839 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
840 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 841 | |
414c70cb LG |
842 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
843 | struct device_attribute *attr, char *buf) | |
844 | { | |
a5766f11 | 845 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 846 | |
4fca9545 DB |
847 | return regulator_print_opmode(buf, |
848 | rdev->constraints->state_mem.mode); | |
414c70cb | 849 | } |
7ad68e2f DB |
850 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
851 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
852 | |
853 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
854 | struct device_attribute *attr, char *buf) | |
855 | { | |
a5766f11 | 856 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 857 | |
4fca9545 DB |
858 | return regulator_print_opmode(buf, |
859 | rdev->constraints->state_disk.mode); | |
414c70cb | 860 | } |
7ad68e2f DB |
861 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
862 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
863 | |
864 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
865 | struct device_attribute *attr, char *buf) | |
866 | { | |
a5766f11 | 867 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 868 | |
4fca9545 DB |
869 | return regulator_print_opmode(buf, |
870 | rdev->constraints->state_standby.mode); | |
414c70cb | 871 | } |
7ad68e2f DB |
872 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
873 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
874 | |
875 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
876 | struct device_attribute *attr, char *buf) | |
877 | { | |
a5766f11 | 878 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 879 | |
4fca9545 DB |
880 | return regulator_print_state(buf, |
881 | rdev->constraints->state_mem.enabled); | |
414c70cb | 882 | } |
7ad68e2f DB |
883 | static DEVICE_ATTR(suspend_mem_state, 0444, |
884 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
885 | |
886 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
887 | struct device_attribute *attr, char *buf) | |
888 | { | |
a5766f11 | 889 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 890 | |
4fca9545 DB |
891 | return regulator_print_state(buf, |
892 | rdev->constraints->state_disk.enabled); | |
414c70cb | 893 | } |
7ad68e2f DB |
894 | static DEVICE_ATTR(suspend_disk_state, 0444, |
895 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
896 | |
897 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
898 | struct device_attribute *attr, char *buf) | |
899 | { | |
a5766f11 | 900 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 901 | |
4fca9545 DB |
902 | return regulator_print_state(buf, |
903 | rdev->constraints->state_standby.enabled); | |
414c70cb | 904 | } |
7ad68e2f DB |
905 | static DEVICE_ATTR(suspend_standby_state, 0444, |
906 | regulator_suspend_standby_state_show, NULL); | |
907 | ||
f59c8f9f MB |
908 | static ssize_t regulator_bypass_show(struct device *dev, |
909 | struct device_attribute *attr, char *buf) | |
910 | { | |
911 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
912 | const char *report; | |
913 | bool bypass; | |
914 | int ret; | |
915 | ||
916 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
917 | ||
918 | if (ret != 0) | |
919 | report = "unknown"; | |
920 | else if (bypass) | |
921 | report = "enabled"; | |
922 | else | |
923 | report = "disabled"; | |
924 | ||
925 | return sprintf(buf, "%s\n", report); | |
926 | } | |
927 | static DEVICE_ATTR(bypass, 0444, | |
928 | regulator_bypass_show, NULL); | |
bc558a60 | 929 | |
414c70cb LG |
930 | /* Calculate the new optimum regulator operating mode based on the new total |
931 | * consumer load. All locks held by caller */ | |
8460ef38 | 932 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
933 | { |
934 | struct regulator *sibling; | |
935 | int current_uA = 0, output_uV, input_uV, err; | |
936 | unsigned int mode; | |
937 | ||
8460ef38 BA |
938 | /* |
939 | * first check to see if we can set modes at all, otherwise just | |
940 | * tell the consumer everything is OK. | |
941 | */ | |
74a569ee MG |
942 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
943 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 944 | return 0; |
74a569ee | 945 | } |
8460ef38 | 946 | |
8f4490e0 BA |
947 | if (!rdev->desc->ops->get_optimum_mode && |
948 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
949 | return 0; |
950 | ||
8f4490e0 BA |
951 | if (!rdev->desc->ops->set_mode && |
952 | !rdev->desc->ops->set_load) | |
8460ef38 | 953 | return -EINVAL; |
414c70cb | 954 | |
414c70cb | 955 | /* calc total requested load */ |
5451781d DA |
956 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
957 | if (sibling->enable_count) | |
958 | current_uA += sibling->uA_load; | |
959 | } | |
414c70cb | 960 | |
22a10bca SB |
961 | current_uA += rdev->constraints->system_load; |
962 | ||
8f4490e0 BA |
963 | if (rdev->desc->ops->set_load) { |
964 | /* set the optimum mode for our new total regulator load */ | |
965 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
966 | if (err < 0) | |
967 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
968 | } else { | |
57776617 | 969 | /* get output voltage */ |
d22b85a1 | 970 | output_uV = regulator_get_voltage_rdev(rdev); |
57776617 JP |
971 | if (output_uV <= 0) { |
972 | rdev_err(rdev, "invalid output voltage found\n"); | |
973 | return -EINVAL; | |
974 | } | |
975 | ||
976 | /* get input voltage */ | |
977 | input_uV = 0; | |
978 | if (rdev->supply) | |
979 | input_uV = regulator_get_voltage(rdev->supply); | |
980 | if (input_uV <= 0) | |
981 | input_uV = rdev->constraints->input_uV; | |
982 | if (input_uV <= 0) { | |
983 | rdev_err(rdev, "invalid input voltage found\n"); | |
984 | return -EINVAL; | |
985 | } | |
986 | ||
8f4490e0 BA |
987 | /* now get the optimum mode for our new total regulator load */ |
988 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
989 | output_uV, current_uA); | |
990 | ||
991 | /* check the new mode is allowed */ | |
992 | err = regulator_mode_constrain(rdev, &mode); | |
993 | if (err < 0) { | |
994 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
995 | current_uA, input_uV, output_uV); | |
996 | return err; | |
997 | } | |
414c70cb | 998 | |
8f4490e0 BA |
999 | err = rdev->desc->ops->set_mode(rdev, mode); |
1000 | if (err < 0) | |
1001 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
1002 | } |
1003 | ||
8460ef38 | 1004 | return err; |
414c70cb LG |
1005 | } |
1006 | ||
0955f5be SB |
1007 | static int __suspend_set_state(struct regulator_dev *rdev, |
1008 | const struct regulator_state *rstate) | |
414c70cb LG |
1009 | { |
1010 | int ret = 0; | |
638f85c5 | 1011 | |
72069f99 CZ |
1012 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1013 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1014 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1015 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1016 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1017 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1018 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1019 | ret = 0; | |
1020 | ||
414c70cb | 1021 | if (ret < 0) { |
5da84fd9 | 1022 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
1023 | return ret; |
1024 | } | |
1025 | ||
1026 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1027 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1028 | if (ret < 0) { | |
5da84fd9 | 1029 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
1030 | return ret; |
1031 | } | |
1032 | } | |
1033 | ||
1034 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1035 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1036 | if (ret < 0) { | |
5da84fd9 | 1037 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
1038 | return ret; |
1039 | } | |
1040 | } | |
414c70cb | 1041 | |
f7efad10 | 1042 | return ret; |
414c70cb LG |
1043 | } |
1044 | ||
0955f5be SB |
1045 | static int suspend_set_initial_state(struct regulator_dev *rdev) |
1046 | { | |
1047 | const struct regulator_state *rstate; | |
1048 | ||
1049 | rstate = regulator_get_suspend_state_check(rdev, | |
1050 | rdev->constraints->initial_state); | |
1051 | if (!rstate) | |
1052 | return 0; | |
1053 | ||
1054 | return __suspend_set_state(rdev, rstate); | |
1055 | } | |
1056 | ||
414c70cb LG |
1057 | static void print_constraints(struct regulator_dev *rdev) |
1058 | { | |
1059 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1060 | char buf[160] = ""; |
5751a99f | 1061 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1062 | int count = 0; |
1063 | int ret; | |
414c70cb | 1064 | |
8f031b48 | 1065 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1066 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1067 | count += scnprintf(buf + count, len - count, "%d mV ", |
1068 | constraints->min_uV / 1000); | |
414c70cb | 1069 | else |
5751a99f SW |
1070 | count += scnprintf(buf + count, len - count, |
1071 | "%d <--> %d mV ", | |
1072 | constraints->min_uV / 1000, | |
1073 | constraints->max_uV / 1000); | |
8f031b48 MB |
1074 | } |
1075 | ||
1076 | if (!constraints->min_uV || | |
1077 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1078 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1079 | if (ret > 0) |
5751a99f SW |
1080 | count += scnprintf(buf + count, len - count, |
1081 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1082 | } |
1083 | ||
bf5892a8 | 1084 | if (constraints->uV_offset) |
5751a99f SW |
1085 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1086 | constraints->uV_offset / 1000); | |
bf5892a8 | 1087 | |
8f031b48 | 1088 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1089 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1090 | count += scnprintf(buf + count, len - count, "%d mA ", |
1091 | constraints->min_uA / 1000); | |
414c70cb | 1092 | else |
5751a99f SW |
1093 | count += scnprintf(buf + count, len - count, |
1094 | "%d <--> %d mA ", | |
1095 | constraints->min_uA / 1000, | |
1096 | constraints->max_uA / 1000); | |
8f031b48 MB |
1097 | } |
1098 | ||
1099 | if (!constraints->min_uA || | |
1100 | constraints->min_uA != constraints->max_uA) { | |
1101 | ret = _regulator_get_current_limit(rdev); | |
1102 | if (ret > 0) | |
5751a99f SW |
1103 | count += scnprintf(buf + count, len - count, |
1104 | "at %d mA ", ret / 1000); | |
414c70cb | 1105 | } |
8f031b48 | 1106 | |
414c70cb | 1107 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1108 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1109 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1110 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1111 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1112 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1113 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
99ad5f6e | 1114 | count += scnprintf(buf + count, len - count, "standby "); |
414c70cb | 1115 | |
215b8b05 | 1116 | if (!count) |
99ad5f6e MM |
1117 | count = scnprintf(buf, len, "no parameters"); |
1118 | else | |
1119 | --count; | |
1120 | ||
1121 | count += scnprintf(buf + count, len - count, ", %s", | |
1122 | _regulator_is_enabled(rdev) ? "enabled" : "disabled"); | |
215b8b05 | 1123 | |
194dbaef | 1124 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
1125 | |
1126 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1127 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1128 | rdev_warn(rdev, |
1129 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1130 | } |
1131 | ||
e79055d6 | 1132 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1133 | struct regulation_constraints *constraints) |
a5766f11 | 1134 | { |
272e2315 | 1135 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1136 | int ret; |
1137 | ||
1138 | /* do we need to apply the constraint voltage */ | |
1139 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1140 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1141 | int target_min, target_max; | |
d22b85a1 | 1142 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1143 | |
1144 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1145 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1146 | rdev_info(rdev, "Setting %d-%duV\n", |
1147 | rdev->constraints->min_uV, | |
1148 | rdev->constraints->max_uV); | |
1149 | _regulator_do_set_voltage(rdev, | |
1150 | rdev->constraints->min_uV, | |
1151 | rdev->constraints->max_uV); | |
d22b85a1 | 1152 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1153 | } |
1154 | ||
064d5cd1 | 1155 | if (current_uV < 0) { |
69d58839 NM |
1156 | rdev_err(rdev, |
1157 | "failed to get the current voltage(%d)\n", | |
1158 | current_uV); | |
064d5cd1 AB |
1159 | return current_uV; |
1160 | } | |
fa93fd4e MB |
1161 | |
1162 | /* | |
1163 | * If we're below the minimum voltage move up to the | |
1164 | * minimum voltage, if we're above the maximum voltage | |
1165 | * then move down to the maximum. | |
1166 | */ | |
1167 | target_min = current_uV; | |
1168 | target_max = current_uV; | |
1169 | ||
1170 | if (current_uV < rdev->constraints->min_uV) { | |
1171 | target_min = rdev->constraints->min_uV; | |
1172 | target_max = rdev->constraints->min_uV; | |
1173 | } | |
1174 | ||
1175 | if (current_uV > rdev->constraints->max_uV) { | |
1176 | target_min = rdev->constraints->max_uV; | |
1177 | target_max = rdev->constraints->max_uV; | |
1178 | } | |
1179 | ||
1180 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1181 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1182 | current_uV, target_min, target_max); | |
064d5cd1 | 1183 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1184 | rdev, target_min, target_max); |
064d5cd1 AB |
1185 | if (ret < 0) { |
1186 | rdev_err(rdev, | |
fa93fd4e MB |
1187 | "failed to apply %d-%duV constraint(%d)\n", |
1188 | target_min, target_max, ret); | |
064d5cd1 AB |
1189 | return ret; |
1190 | } | |
75790251 | 1191 | } |
af5866c9 | 1192 | } |
e06f5b4f | 1193 | |
4367cfdc DB |
1194 | /* constrain machine-level voltage specs to fit |
1195 | * the actual range supported by this regulator. | |
1196 | */ | |
1197 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1198 | int count = rdev->desc->n_voltages; | |
1199 | int i; | |
1200 | int min_uV = INT_MAX; | |
1201 | int max_uV = INT_MIN; | |
1202 | int cmin = constraints->min_uV; | |
1203 | int cmax = constraints->max_uV; | |
1204 | ||
3e590918 MB |
1205 | /* it's safe to autoconfigure fixed-voltage supplies |
1206 | and the constraints are used by list_voltage. */ | |
4367cfdc | 1207 | if (count == 1 && !cmin) { |
3e590918 | 1208 | cmin = 1; |
4367cfdc | 1209 | cmax = INT_MAX; |
3e590918 MB |
1210 | constraints->min_uV = cmin; |
1211 | constraints->max_uV = cmax; | |
4367cfdc DB |
1212 | } |
1213 | ||
3e2b9abd MB |
1214 | /* voltage constraints are optional */ |
1215 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1216 | return 0; |
3e2b9abd | 1217 | |
4367cfdc | 1218 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1219 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1220 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1221 | return -EINVAL; |
4367cfdc DB |
1222 | } |
1223 | ||
6d30fc51 CM |
1224 | /* no need to loop voltages if range is continuous */ |
1225 | if (rdev->desc->continuous_voltage_range) | |
1226 | return 0; | |
1227 | ||
4367cfdc DB |
1228 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1229 | for (i = 0; i < count; i++) { | |
1230 | int value; | |
1231 | ||
1232 | value = ops->list_voltage(rdev, i); | |
1233 | if (value <= 0) | |
1234 | continue; | |
1235 | ||
1236 | /* maybe adjust [min_uV..max_uV] */ | |
1237 | if (value >= cmin && value < min_uV) | |
1238 | min_uV = value; | |
1239 | if (value <= cmax && value > max_uV) | |
1240 | max_uV = value; | |
1241 | } | |
1242 | ||
1243 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1244 | if (max_uV < min_uV) { | |
fff15bef MB |
1245 | rdev_err(rdev, |
1246 | "unsupportable voltage constraints %u-%uuV\n", | |
1247 | min_uV, max_uV); | |
e79055d6 | 1248 | return -EINVAL; |
4367cfdc DB |
1249 | } |
1250 | ||
1251 | /* use regulator's subset of machine constraints */ | |
1252 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1253 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1254 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1255 | constraints->min_uV = min_uV; |
1256 | } | |
1257 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1258 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1259 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1260 | constraints->max_uV = max_uV; |
1261 | } | |
1262 | } | |
1263 | ||
e79055d6 MB |
1264 | return 0; |
1265 | } | |
1266 | ||
f8c1700d LD |
1267 | static int machine_constraints_current(struct regulator_dev *rdev, |
1268 | struct regulation_constraints *constraints) | |
1269 | { | |
272e2315 | 1270 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1271 | int ret; |
1272 | ||
1273 | if (!constraints->min_uA && !constraints->max_uA) | |
1274 | return 0; | |
1275 | ||
1276 | if (constraints->min_uA > constraints->max_uA) { | |
1277 | rdev_err(rdev, "Invalid current constraints\n"); | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | ||
1281 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1282 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /* Set regulator current in constraints range */ | |
1287 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1288 | constraints->max_uA); | |
1289 | if (ret < 0) { | |
1290 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | return 0; | |
1295 | } | |
1296 | ||
30c21971 MP |
1297 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1298 | ||
e79055d6 MB |
1299 | /** |
1300 | * set_machine_constraints - sets regulator constraints | |
1301 | * @rdev: regulator source | |
1302 | * @constraints: constraints to apply | |
1303 | * | |
1304 | * Allows platform initialisation code to define and constrain | |
1305 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1306 | * Constraints *must* be set by platform code in order for some | |
1307 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1308 | * set_mode. | |
1309 | */ | |
1310 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1311 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1312 | { |
1313 | int ret = 0; | |
272e2315 | 1314 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1315 | |
9a8f5e07 MB |
1316 | if (constraints) |
1317 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1318 | GFP_KERNEL); | |
1319 | else | |
1320 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1321 | GFP_KERNEL); | |
f8c12fe3 MB |
1322 | if (!rdev->constraints) |
1323 | return -ENOMEM; | |
af5866c9 | 1324 | |
f8c12fe3 | 1325 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1326 | if (ret != 0) |
6333ef46 | 1327 | return ret; |
e79055d6 | 1328 | |
f8c1700d | 1329 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1330 | if (ret != 0) |
6333ef46 | 1331 | return ret; |
e79055d6 | 1332 | |
36e4f839 SB |
1333 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1334 | ret = ops->set_input_current_limit(rdev, | |
1335 | rdev->constraints->ilim_uA); | |
1336 | if (ret < 0) { | |
1337 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1338 | return ret; |
36e4f839 SB |
1339 | } |
1340 | } | |
1341 | ||
a5766f11 | 1342 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1343 | if (rdev->constraints->initial_state) { |
0955f5be | 1344 | ret = suspend_set_initial_state(rdev); |
e06f5b4f | 1345 | if (ret < 0) { |
5da84fd9 | 1346 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1347 | return ret; |
e06f5b4f MB |
1348 | } |
1349 | } | |
a5766f11 | 1350 | |
9a8f5e07 | 1351 | if (rdev->constraints->initial_mode) { |
a308466c | 1352 | if (!ops->set_mode) { |
5da84fd9 | 1353 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1354 | return -EINVAL; |
a308466c MB |
1355 | } |
1356 | ||
f8c12fe3 | 1357 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1358 | if (ret < 0) { |
5da84fd9 | 1359 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1360 | return ret; |
a308466c | 1361 | } |
fa94e48e DA |
1362 | } else if (rdev->constraints->system_load) { |
1363 | /* | |
1364 | * We'll only apply the initial system load if an | |
1365 | * initial mode wasn't specified. | |
1366 | */ | |
1367 | drms_uA_update(rdev); | |
a308466c MB |
1368 | } |
1369 | ||
1653ccf4 YSB |
1370 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1371 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1372 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1373 | if (ret < 0) { | |
1374 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1375 | return ret; |
6f0b2c69 YSB |
1376 | } |
1377 | } | |
1378 | ||
23c779b9 SB |
1379 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1380 | ret = ops->set_pull_down(rdev); | |
1381 | if (ret < 0) { | |
1382 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1383 | return ret; |
23c779b9 SB |
1384 | } |
1385 | } | |
1386 | ||
57f66b78 SB |
1387 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1388 | ret = ops->set_soft_start(rdev); | |
1389 | if (ret < 0) { | |
1390 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1391 | return ret; |
57f66b78 SB |
1392 | } |
1393 | } | |
1394 | ||
3a003bae SB |
1395 | if (rdev->constraints->over_current_protection |
1396 | && ops->set_over_current_protection) { | |
1397 | ret = ops->set_over_current_protection(rdev); | |
1398 | if (ret < 0) { | |
1399 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1400 | return ret; |
3a003bae SB |
1401 | } |
1402 | } | |
1403 | ||
670666b9 LD |
1404 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1405 | bool ad_state = (rdev->constraints->active_discharge == | |
1406 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1407 | ||
1408 | ret = ops->set_active_discharge(rdev, ad_state); | |
1409 | if (ret < 0) { | |
1410 | rdev_err(rdev, "failed to set active discharge\n"); | |
1411 | return ret; | |
1412 | } | |
1413 | } | |
1414 | ||
2bb16663 OS |
1415 | /* If the constraints say the regulator should be on at this point |
1416 | * and we have control then make sure it is enabled. | |
1417 | */ | |
1418 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
05f224ca DA |
1419 | if (rdev->supply) { |
1420 | ret = regulator_enable(rdev->supply); | |
1421 | if (ret < 0) { | |
1422 | _regulator_put(rdev->supply); | |
1423 | rdev->supply = NULL; | |
1424 | return ret; | |
1425 | } | |
1426 | } | |
1427 | ||
2bb16663 OS |
1428 | ret = _regulator_do_enable(rdev); |
1429 | if (ret < 0 && ret != -EINVAL) { | |
1430 | rdev_err(rdev, "failed to enable\n"); | |
1431 | return ret; | |
1432 | } | |
089b3f61 PP |
1433 | |
1434 | if (rdev->constraints->always_on) | |
1435 | rdev->use_count++; | |
2bb16663 OS |
1436 | } |
1437 | ||
a5766f11 | 1438 | print_constraints(rdev); |
1a6958e7 | 1439 | return 0; |
a5766f11 LG |
1440 | } |
1441 | ||
1442 | /** | |
1443 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1444 | * @rdev: regulator name |
1445 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1446 | * |
1447 | * Called by platform initialisation code to set the supply regulator for this | |
1448 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1449 | * core if it's child is enabled. | |
1450 | */ | |
1451 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1452 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1453 | { |
1454 | int err; | |
1455 | ||
3801b86a MB |
1456 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1457 | ||
e2c09ae7 JMC |
1458 | if (!try_module_get(supply_rdev->owner)) |
1459 | return -ENODEV; | |
1460 | ||
3801b86a | 1461 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1462 | if (rdev->supply == NULL) { |
1463 | err = -ENOMEM; | |
3801b86a | 1464 | return err; |
a5766f11 | 1465 | } |
57ad526a | 1466 | supply_rdev->open_count++; |
3801b86a MB |
1467 | |
1468 | return 0; | |
a5766f11 LG |
1469 | } |
1470 | ||
1471 | /** | |
06c63f93 | 1472 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1473 | * @rdev: regulator source |
40f9244f | 1474 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1475 | * @supply: symbolic name for supply |
a5766f11 LG |
1476 | * |
1477 | * Allows platform initialisation code to map physical regulator | |
1478 | * sources to symbolic names for supplies for use by devices. Devices | |
1479 | * should use these symbolic names to request regulators, avoiding the | |
1480 | * need to provide board-specific regulator names as platform data. | |
1481 | */ | |
1482 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1483 | const char *consumer_dev_name, |
1484 | const char *supply) | |
a5766f11 | 1485 | { |
5c065401 | 1486 | struct regulator_map *node, *new_node; |
9ed2099e | 1487 | int has_dev; |
a5766f11 LG |
1488 | |
1489 | if (supply == NULL) | |
1490 | return -EINVAL; | |
1491 | ||
9ed2099e MB |
1492 | if (consumer_dev_name != NULL) |
1493 | has_dev = 1; | |
1494 | else | |
1495 | has_dev = 0; | |
1496 | ||
5c065401 MM |
1497 | new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1498 | if (new_node == NULL) | |
1499 | return -ENOMEM; | |
1500 | ||
1501 | new_node->regulator = rdev; | |
1502 | new_node->supply = supply; | |
1503 | ||
1504 | if (has_dev) { | |
1505 | new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1506 | if (new_node->dev_name == NULL) { | |
1507 | kfree(new_node); | |
1508 | return -ENOMEM; | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | mutex_lock(®ulator_list_mutex); | |
6001e13c | 1513 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1514 | if (node->dev_name && consumer_dev_name) { |
1515 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1516 | continue; | |
1517 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1518 | continue; |
23b5cc2a JN |
1519 | } |
1520 | ||
6001e13c DB |
1521 | if (strcmp(node->supply, supply) != 0) |
1522 | continue; | |
1523 | ||
737f360d MB |
1524 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1525 | consumer_dev_name, | |
1526 | dev_name(&node->regulator->dev), | |
1527 | node->regulator->desc->name, | |
1528 | supply, | |
1529 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
5c065401 | 1530 | goto fail; |
6001e13c DB |
1531 | } |
1532 | ||
5c065401 MM |
1533 | list_add(&new_node->list, ®ulator_map_list); |
1534 | mutex_unlock(®ulator_list_mutex); | |
40f9244f | 1535 | |
a5766f11 | 1536 | return 0; |
5c065401 MM |
1537 | |
1538 | fail: | |
1539 | mutex_unlock(®ulator_list_mutex); | |
1540 | kfree(new_node->dev_name); | |
1541 | kfree(new_node); | |
1542 | return -EBUSY; | |
a5766f11 LG |
1543 | } |
1544 | ||
0f1d747b MR |
1545 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1546 | { | |
1547 | struct regulator_map *node, *n; | |
1548 | ||
1549 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1550 | if (rdev == node->regulator) { | |
1551 | list_del(&node->list); | |
40f9244f | 1552 | kfree(node->dev_name); |
0f1d747b | 1553 | kfree(node); |
0f1d747b MR |
1554 | } |
1555 | } | |
1556 | } | |
1557 | ||
2d80a91b RF |
1558 | #ifdef CONFIG_DEBUG_FS |
1559 | static ssize_t constraint_flags_read_file(struct file *file, | |
1560 | char __user *user_buf, | |
1561 | size_t count, loff_t *ppos) | |
1562 | { | |
1563 | const struct regulator *regulator = file->private_data; | |
1564 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1565 | char *buf; | |
1566 | ssize_t ret; | |
1567 | ||
1568 | if (!c) | |
1569 | return 0; | |
1570 | ||
1571 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1572 | if (!buf) | |
1573 | return -ENOMEM; | |
1574 | ||
1575 | ret = snprintf(buf, PAGE_SIZE, | |
1576 | "always_on: %u\n" | |
1577 | "boot_on: %u\n" | |
1578 | "apply_uV: %u\n" | |
1579 | "ramp_disable: %u\n" | |
1580 | "soft_start: %u\n" | |
1581 | "pull_down: %u\n" | |
1582 | "over_current_protection: %u\n", | |
1583 | c->always_on, | |
1584 | c->boot_on, | |
1585 | c->apply_uV, | |
1586 | c->ramp_disable, | |
1587 | c->soft_start, | |
1588 | c->pull_down, | |
1589 | c->over_current_protection); | |
1590 | ||
1591 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1592 | kfree(buf); | |
1593 | ||
1594 | return ret; | |
1595 | } | |
1596 | ||
1597 | #endif | |
1598 | ||
1599 | static const struct file_operations constraint_flags_fops = { | |
1600 | #ifdef CONFIG_DEBUG_FS | |
1601 | .open = simple_open, | |
1602 | .read = constraint_flags_read_file, | |
1603 | .llseek = default_llseek, | |
1604 | #endif | |
1605 | }; | |
1606 | ||
f5726ae3 | 1607 | #define REG_STR_SIZE 64 |
414c70cb LG |
1608 | |
1609 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1610 | struct device *dev, | |
1611 | const char *supply_name) | |
1612 | { | |
1613 | struct regulator *regulator; | |
87fe29b6 MM |
1614 | int err; |
1615 | ||
1616 | if (dev) { | |
1617 | char buf[REG_STR_SIZE]; | |
1618 | int size; | |
1619 | ||
1620 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", | |
1621 | dev->kobj.name, supply_name); | |
1622 | if (size >= REG_STR_SIZE) | |
1623 | return NULL; | |
1624 | ||
1625 | supply_name = kstrdup(buf, GFP_KERNEL); | |
1626 | if (supply_name == NULL) | |
1627 | return NULL; | |
1628 | } else { | |
1629 | supply_name = kstrdup_const(supply_name, GFP_KERNEL); | |
1630 | if (supply_name == NULL) | |
1631 | return NULL; | |
1632 | } | |
414c70cb LG |
1633 | |
1634 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
87fe29b6 MM |
1635 | if (regulator == NULL) { |
1636 | kfree(supply_name); | |
414c70cb | 1637 | return NULL; |
87fe29b6 | 1638 | } |
414c70cb | 1639 | |
414c70cb | 1640 | regulator->rdev = rdev; |
87fe29b6 MM |
1641 | regulator->supply_name = supply_name; |
1642 | ||
1643 | regulator_lock(rdev); | |
414c70cb | 1644 | list_add(®ulator->list, &rdev->consumer_list); |
87fe29b6 | 1645 | regulator_unlock(rdev); |
414c70cb LG |
1646 | |
1647 | if (dev) { | |
e2c98eaf SG |
1648 | regulator->dev = dev; |
1649 | ||
222cc7b1 | 1650 | /* Add a link to the device sysfs entry */ |
ff268b56 | 1651 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
87fe29b6 | 1652 | supply_name); |
414c70cb | 1653 | if (err) { |
ff268b56 | 1654 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1655 | dev->kobj.name, err); |
222cc7b1 | 1656 | /* non-fatal */ |
414c70cb | 1657 | } |
5de70519 MB |
1658 | } |
1659 | ||
87fe29b6 | 1660 | regulator->debugfs = debugfs_create_dir(supply_name, |
5de70519 | 1661 | rdev->debugfs); |
24751434 | 1662 | if (!regulator->debugfs) { |
ad3a942b | 1663 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1664 | } else { |
1665 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1666 | ®ulator->uA_load); | |
1667 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1668 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1669 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1670 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1671 | debugfs_create_file("constraint_flags", 0444, |
1672 | regulator->debugfs, regulator, | |
1673 | &constraint_flags_fops); | |
414c70cb | 1674 | } |
5de70519 | 1675 | |
6492bc1b MB |
1676 | /* |
1677 | * Check now if the regulator is an always on regulator - if | |
1678 | * it is then we don't need to do nearly so much work for | |
1679 | * enable/disable calls. | |
1680 | */ | |
8a34e979 | 1681 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1682 | _regulator_is_enabled(rdev)) |
1683 | regulator->always_on = true; | |
1684 | ||
414c70cb | 1685 | return regulator; |
414c70cb LG |
1686 | } |
1687 | ||
31aae2be MB |
1688 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1689 | { | |
00c877c6 LD |
1690 | if (rdev->constraints && rdev->constraints->enable_time) |
1691 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1692 | if (rdev->desc->ops->enable_time) |
1693 | return rdev->desc->ops->enable_time(rdev); | |
1694 | return rdev->desc->enable_time; | |
31aae2be MB |
1695 | } |
1696 | ||
a06ccd9c CK |
1697 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1698 | struct device *dev, const char *supply) | |
1699 | { | |
1700 | struct regulator_supply_alias *map; | |
1701 | ||
1702 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1703 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1704 | return map; | |
1705 | ||
1706 | return NULL; | |
1707 | } | |
1708 | ||
1709 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1710 | { | |
1711 | struct regulator_supply_alias *map; | |
1712 | ||
1713 | map = regulator_find_supply_alias(*dev, *supply); | |
1714 | if (map) { | |
1715 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1716 | *supply, map->alias_supply, | |
1717 | dev_name(map->alias_dev)); | |
1718 | *dev = map->alias_dev; | |
1719 | *supply = map->alias_supply; | |
1720 | } | |
1721 | } | |
1722 | ||
85f3b431 TV |
1723 | static int regulator_match(struct device *dev, const void *data) |
1724 | { | |
1725 | struct regulator_dev *r = dev_to_rdev(dev); | |
1726 | ||
1727 | return strcmp(rdev_get_name(r), data) == 0; | |
1728 | } | |
1729 | ||
1730 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1731 | { | |
1732 | struct device *dev; | |
1733 | ||
1734 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1735 | ||
1736 | return dev ? dev_to_rdev(dev) : NULL; | |
1737 | } | |
1738 | ||
1739 | /** | |
1740 | * regulator_dev_lookup - lookup a regulator device. | |
1741 | * @dev: device for regulator "consumer". | |
1742 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1743 | * |
1744 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1745 | * @supply and with the embedded struct device refcount incremented by one. |
1746 | * The refcount must be dropped by calling put_device(). | |
1747 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1748 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1749 | * in the future. | |
85f3b431 | 1750 | */ |
69511a45 | 1751 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1752 | const char *supply) |
69511a45 | 1753 | { |
06217197 | 1754 | struct regulator_dev *r = NULL; |
69511a45 | 1755 | struct device_node *node; |
576ca436 MB |
1756 | struct regulator_map *map; |
1757 | const char *devname = NULL; | |
69511a45 | 1758 | |
a06ccd9c CK |
1759 | regulator_supply_alias(&dev, &supply); |
1760 | ||
69511a45 RN |
1761 | /* first do a dt based lookup */ |
1762 | if (dev && dev->of_node) { | |
1763 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1764 | if (node) { |
85f3b431 TV |
1765 | r = of_find_regulator_by_node(node); |
1766 | if (r) | |
1767 | return r; | |
163478da | 1768 | |
6d191a5f | 1769 | /* |
163478da DT |
1770 | * We have a node, but there is no device. |
1771 | * assume it has not registered yet. | |
6d191a5f | 1772 | */ |
163478da | 1773 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1774 | } |
69511a45 RN |
1775 | } |
1776 | ||
1777 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1778 | if (dev) |
1779 | devname = dev_name(dev); | |
1780 | ||
85f3b431 | 1781 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1782 | list_for_each_entry(map, ®ulator_map_list, list) { |
1783 | /* If the mapping has a device set up it must match */ | |
1784 | if (map->dev_name && | |
1785 | (!devname || strcmp(map->dev_name, devname))) | |
1786 | continue; | |
1787 | ||
85f3b431 TV |
1788 | if (strcmp(map->supply, supply) == 0 && |
1789 | get_device(&map->regulator->dev)) { | |
163478da DT |
1790 | r = map->regulator; |
1791 | break; | |
85f3b431 | 1792 | } |
576ca436 | 1793 | } |
85f3b431 | 1794 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1795 | |
06217197 CK |
1796 | if (r) |
1797 | return r; | |
1798 | ||
1799 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1800 | if (r) |
1801 | return r; | |
1802 | ||
1803 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1804 | } |
1805 | ||
6261b06d BA |
1806 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1807 | { | |
1808 | struct regulator_dev *r; | |
1809 | struct device *dev = rdev->dev.parent; | |
1810 | int ret; | |
1811 | ||
48f1b4ef | 1812 | /* No supply to resolve? */ |
6261b06d BA |
1813 | if (!rdev->supply_name) |
1814 | return 0; | |
1815 | ||
1816 | /* Supply already resolved? */ | |
1817 | if (rdev->supply) | |
1818 | return 0; | |
1819 | ||
163478da DT |
1820 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1821 | if (IS_ERR(r)) { | |
1822 | ret = PTR_ERR(r); | |
1823 | ||
06423121 MB |
1824 | /* Did the lookup explicitly defer for us? */ |
1825 | if (ret == -EPROBE_DEFER) | |
1826 | return ret; | |
1827 | ||
9f7e25ed MB |
1828 | if (have_full_constraints()) { |
1829 | r = dummy_regulator_rdev; | |
85f3b431 | 1830 | get_device(&r->dev); |
9f7e25ed MB |
1831 | } else { |
1832 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1833 | rdev->supply_name, rdev->desc->name); | |
1834 | return -EPROBE_DEFER; | |
1835 | } | |
6261b06d BA |
1836 | } |
1837 | ||
66d228a2 JH |
1838 | /* |
1839 | * If the supply's parent device is not the same as the | |
1840 | * regulator's parent device, then ensure the parent device | |
1841 | * is bound before we resolve the supply, in case the parent | |
1842 | * device get probe deferred and unregisters the supply. | |
1843 | */ | |
1844 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1845 | if (!device_is_bound(r->dev.parent)) { | |
1846 | put_device(&r->dev); | |
1847 | return -EPROBE_DEFER; | |
1848 | } | |
1849 | } | |
1850 | ||
6261b06d BA |
1851 | /* Recursively resolve the supply of the supply */ |
1852 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1853 | if (ret < 0) { |
1854 | put_device(&r->dev); | |
6261b06d | 1855 | return ret; |
85f3b431 | 1856 | } |
6261b06d BA |
1857 | |
1858 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1859 | if (ret < 0) { |
1860 | put_device(&r->dev); | |
6261b06d | 1861 | return ret; |
85f3b431 | 1862 | } |
6261b06d | 1863 | |
05f224ca DA |
1864 | /* |
1865 | * In set_machine_constraints() we may have turned this regulator on | |
1866 | * but we couldn't propagate to the supply if it hadn't been resolved | |
1867 | * yet. Do it now. | |
1868 | */ | |
1869 | if (rdev->use_count) { | |
6261b06d | 1870 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1871 | if (ret < 0) { |
9f8df6ad | 1872 | _regulator_put(rdev->supply); |
8e5356a7 | 1873 | rdev->supply = NULL; |
6261b06d | 1874 | return ret; |
36a1f1b6 | 1875 | } |
6261b06d BA |
1876 | } |
1877 | ||
1878 | return 0; | |
1879 | } | |
1880 | ||
5ffbd136 | 1881 | /* Internal regulator request function */ |
a8bd42a9 DT |
1882 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1883 | enum regulator_get_type get_type) | |
414c70cb LG |
1884 | { |
1885 | struct regulator_dev *rdev; | |
7d245afa | 1886 | struct regulator *regulator; |
b59b6544 | 1887 | struct device_link *link; |
317b5684 | 1888 | int ret; |
414c70cb | 1889 | |
a8bd42a9 DT |
1890 | if (get_type >= MAX_GET_TYPE) { |
1891 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1892 | return ERR_PTR(-EINVAL); | |
1893 | } | |
1894 | ||
414c70cb | 1895 | if (id == NULL) { |
5da84fd9 | 1896 | pr_err("get() with no identifier\n"); |
043c998f | 1897 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1898 | } |
1899 | ||
163478da | 1900 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1901 | if (IS_ERR(rdev)) { |
1902 | ret = PTR_ERR(rdev); | |
1e4b545c | 1903 | |
a4d7641f DT |
1904 | /* |
1905 | * If regulator_dev_lookup() fails with error other | |
1906 | * than -ENODEV our job here is done, we simply return it. | |
1907 | */ | |
1908 | if (ret != -ENODEV) | |
1909 | return ERR_PTR(ret); | |
34abbd68 | 1910 | |
a4d7641f DT |
1911 | if (!have_full_constraints()) { |
1912 | dev_warn(dev, | |
1913 | "incomplete constraints, dummy supplies not allowed\n"); | |
1914 | return ERR_PTR(-ENODEV); | |
1915 | } | |
4ddfebd3 | 1916 | |
a4d7641f DT |
1917 | switch (get_type) { |
1918 | case NORMAL_GET: | |
1919 | /* | |
1920 | * Assume that a regulator is physically present and | |
1921 | * enabled, even if it isn't hooked up, and just | |
1922 | * provide a dummy. | |
1923 | */ | |
6e5505cf | 1924 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
1925 | rdev = dummy_regulator_rdev; |
1926 | get_device(&rdev->dev); | |
1927 | break; | |
34abbd68 | 1928 | |
a4d7641f DT |
1929 | case EXCLUSIVE_GET: |
1930 | dev_warn(dev, | |
1931 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 1932 | fallthrough; |
34abbd68 | 1933 | |
a4d7641f DT |
1934 | default: |
1935 | return ERR_PTR(-ENODEV); | |
1936 | } | |
34abbd68 | 1937 | } |
34abbd68 | 1938 | |
5ffbd136 MB |
1939 | if (rdev->exclusive) { |
1940 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1941 | put_device(&rdev->dev); |
1942 | return regulator; | |
5ffbd136 MB |
1943 | } |
1944 | ||
a8bd42a9 | 1945 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1946 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1947 | put_device(&rdev->dev); |
1948 | return regulator; | |
5ffbd136 MB |
1949 | } |
1950 | ||
79d6f049 DO |
1951 | mutex_lock(®ulator_list_mutex); |
1952 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1953 | mutex_unlock(®ulator_list_mutex); | |
1954 | ||
1955 | if (ret != 0) { | |
1956 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1957 | put_device(&rdev->dev); | |
1958 | return regulator; | |
1959 | } | |
1960 | ||
6261b06d BA |
1961 | ret = regulator_resolve_supply(rdev); |
1962 | if (ret < 0) { | |
1963 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1964 | put_device(&rdev->dev); |
1965 | return regulator; | |
6261b06d BA |
1966 | } |
1967 | ||
85f3b431 | 1968 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1969 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1970 | put_device(&rdev->dev); |
1971 | return regulator; | |
1972 | } | |
a5766f11 | 1973 | |
414c70cb LG |
1974 | regulator = create_regulator(rdev, dev, id); |
1975 | if (regulator == NULL) { | |
1976 | regulator = ERR_PTR(-ENOMEM); | |
1977 | module_put(rdev->owner); | |
4affd79a | 1978 | put_device(&rdev->dev); |
85f3b431 | 1979 | return regulator; |
414c70cb LG |
1980 | } |
1981 | ||
5ffbd136 | 1982 | rdev->open_count++; |
a8bd42a9 | 1983 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1984 | rdev->exclusive = 1; |
1985 | ||
1986 | ret = _regulator_is_enabled(rdev); | |
1987 | if (ret > 0) | |
1988 | rdev->use_count = 1; | |
1989 | else | |
1990 | rdev->use_count = 0; | |
1991 | } | |
1992 | ||
b59b6544 SK |
1993 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
1994 | if (!IS_ERR_OR_NULL(link)) | |
1995 | regulator->device_link = true; | |
ed1ae2dd | 1996 | |
414c70cb LG |
1997 | return regulator; |
1998 | } | |
5ffbd136 MB |
1999 | |
2000 | /** | |
2001 | * regulator_get - lookup and obtain a reference to a regulator. | |
2002 | * @dev: device for regulator "consumer" | |
2003 | * @id: Supply name or regulator ID. | |
2004 | * | |
2005 | * Returns a struct regulator corresponding to the regulator producer, | |
2006 | * or IS_ERR() condition containing errno. | |
2007 | * | |
2008 | * Use of supply names configured via regulator_set_device_supply() is | |
2009 | * strongly encouraged. It is recommended that the supply name used | |
2010 | * should match the name used for the supply and/or the relevant | |
2011 | * device pins in the datasheet. | |
2012 | */ | |
2013 | struct regulator *regulator_get(struct device *dev, const char *id) | |
2014 | { | |
a8bd42a9 | 2015 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 2016 | } |
414c70cb LG |
2017 | EXPORT_SYMBOL_GPL(regulator_get); |
2018 | ||
5ffbd136 MB |
2019 | /** |
2020 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
2021 | * @dev: device for regulator "consumer" | |
2022 | * @id: Supply name or regulator ID. | |
2023 | * | |
2024 | * Returns a struct regulator corresponding to the regulator producer, | |
2025 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
2026 | * unable to obtain this regulator while this reference is held and the |
2027 | * use count for the regulator will be initialised to reflect the current | |
2028 | * state of the regulator. | |
5ffbd136 MB |
2029 | * |
2030 | * This is intended for use by consumers which cannot tolerate shared | |
2031 | * use of the regulator such as those which need to force the | |
2032 | * regulator off for correct operation of the hardware they are | |
2033 | * controlling. | |
2034 | * | |
2035 | * Use of supply names configured via regulator_set_device_supply() is | |
2036 | * strongly encouraged. It is recommended that the supply name used | |
2037 | * should match the name used for the supply and/or the relevant | |
2038 | * device pins in the datasheet. | |
2039 | */ | |
2040 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2041 | { | |
a8bd42a9 | 2042 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2043 | } |
2044 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2045 | ||
de1dd9fd MB |
2046 | /** |
2047 | * regulator_get_optional - obtain optional access to a regulator. | |
2048 | * @dev: device for regulator "consumer" | |
2049 | * @id: Supply name or regulator ID. | |
2050 | * | |
2051 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2052 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2053 | * |
2054 | * This is intended for use by consumers for devices which can have | |
2055 | * some supplies unconnected in normal use, such as some MMC devices. | |
2056 | * It can allow the regulator core to provide stub supplies for other | |
2057 | * supplies requested using normal regulator_get() calls without | |
2058 | * disrupting the operation of drivers that can handle absent | |
2059 | * supplies. | |
2060 | * | |
2061 | * Use of supply names configured via regulator_set_device_supply() is | |
2062 | * strongly encouraged. It is recommended that the supply name used | |
2063 | * should match the name used for the supply and/or the relevant | |
2064 | * device pins in the datasheet. | |
2065 | */ | |
2066 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2067 | { | |
a8bd42a9 | 2068 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2069 | } |
2070 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2071 | ||
e1794aa4 | 2072 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2073 | { |
e1794aa4 | 2074 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2075 | |
5de70519 | 2076 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2077 | |
ed1ae2dd | 2078 | if (regulator->dev) { |
b59b6544 SK |
2079 | if (regulator->device_link) |
2080 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2081 | |
2082 | /* remove any sysfs entries */ | |
414c70cb | 2083 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2084 | } |
2085 | ||
66cf9a7e | 2086 | regulator_lock(rdev); |
414c70cb | 2087 | list_del(®ulator->list); |
414c70cb | 2088 | |
5ffbd136 MB |
2089 | rdev->open_count--; |
2090 | rdev->exclusive = 0; | |
66cf9a7e | 2091 | regulator_unlock(rdev); |
5ffbd136 | 2092 | |
0630b614 | 2093 | kfree_const(regulator->supply_name); |
1768514e | 2094 | kfree(regulator); |
e1794aa4 SK |
2095 | } |
2096 | ||
2097 | /* regulator_list_mutex lock held by regulator_put() */ | |
2098 | static void _regulator_put(struct regulator *regulator) | |
2099 | { | |
2100 | struct regulator_dev *rdev; | |
2101 | ||
2102 | if (IS_ERR_OR_NULL(regulator)) | |
2103 | return; | |
2104 | ||
2105 | lockdep_assert_held_once(®ulator_list_mutex); | |
2106 | ||
2107 | /* Docs say you must disable before calling regulator_put() */ | |
2108 | WARN_ON(regulator->enable_count); | |
2109 | ||
2110 | rdev = regulator->rdev; | |
2111 | ||
2112 | destroy_regulator(regulator); | |
1768514e | 2113 | |
414c70cb | 2114 | module_put(rdev->owner); |
4affd79a | 2115 | put_device(&rdev->dev); |
23ff2f0f CK |
2116 | } |
2117 | ||
2118 | /** | |
2119 | * regulator_put - "free" the regulator source | |
2120 | * @regulator: regulator source | |
2121 | * | |
2122 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2123 | * regulator source are balanced by regulator_disable calls prior to calling | |
2124 | * this function. | |
2125 | */ | |
2126 | void regulator_put(struct regulator *regulator) | |
2127 | { | |
2128 | mutex_lock(®ulator_list_mutex); | |
2129 | _regulator_put(regulator); | |
414c70cb LG |
2130 | mutex_unlock(®ulator_list_mutex); |
2131 | } | |
2132 | EXPORT_SYMBOL_GPL(regulator_put); | |
2133 | ||
a06ccd9c CK |
2134 | /** |
2135 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2136 | * | |
2137 | * @dev: device that will be given as the regulator "consumer" | |
2138 | * @id: Supply name or regulator ID | |
2139 | * @alias_dev: device that should be used to lookup the supply | |
2140 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2141 | * supply | |
2142 | * | |
2143 | * All lookups for id on dev will instead be conducted for alias_id on | |
2144 | * alias_dev. | |
2145 | */ | |
2146 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2147 | struct device *alias_dev, | |
2148 | const char *alias_id) | |
2149 | { | |
2150 | struct regulator_supply_alias *map; | |
2151 | ||
2152 | map = regulator_find_supply_alias(dev, id); | |
2153 | if (map) | |
2154 | return -EEXIST; | |
2155 | ||
2156 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2157 | if (!map) | |
2158 | return -ENOMEM; | |
2159 | ||
2160 | map->src_dev = dev; | |
2161 | map->src_supply = id; | |
2162 | map->alias_dev = alias_dev; | |
2163 | map->alias_supply = alias_id; | |
2164 | ||
2165 | list_add(&map->list, ®ulator_supply_alias_list); | |
2166 | ||
2167 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2168 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2169 | ||
2170 | return 0; | |
2171 | } | |
2172 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2173 | ||
2174 | /** | |
2175 | * regulator_unregister_supply_alias - Remove device alias | |
2176 | * | |
2177 | * @dev: device that will be given as the regulator "consumer" | |
2178 | * @id: Supply name or regulator ID | |
2179 | * | |
2180 | * Remove a lookup alias if one exists for id on dev. | |
2181 | */ | |
2182 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2183 | { | |
2184 | struct regulator_supply_alias *map; | |
2185 | ||
2186 | map = regulator_find_supply_alias(dev, id); | |
2187 | if (map) { | |
2188 | list_del(&map->list); | |
2189 | kfree(map); | |
2190 | } | |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2193 | ||
2194 | /** | |
2195 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2196 | * | |
2197 | * @dev: device that will be given as the regulator "consumer" | |
2198 | * @id: List of supply names or regulator IDs | |
2199 | * @alias_dev: device that should be used to lookup the supply | |
2200 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2201 | * lookup the supply | |
2202 | * @num_id: Number of aliases to register | |
2203 | * | |
2204 | * @return 0 on success, an errno on failure. | |
2205 | * | |
2206 | * This helper function allows drivers to register several supply | |
2207 | * aliases in one operation. If any of the aliases cannot be | |
2208 | * registered any aliases that were registered will be removed | |
2209 | * before returning to the caller. | |
2210 | */ | |
9f8c0fe9 LJ |
2211 | int regulator_bulk_register_supply_alias(struct device *dev, |
2212 | const char *const *id, | |
a06ccd9c | 2213 | struct device *alias_dev, |
9f8c0fe9 | 2214 | const char *const *alias_id, |
a06ccd9c CK |
2215 | int num_id) |
2216 | { | |
2217 | int i; | |
2218 | int ret; | |
2219 | ||
2220 | for (i = 0; i < num_id; ++i) { | |
2221 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2222 | alias_id[i]); | |
2223 | if (ret < 0) | |
2224 | goto err; | |
2225 | } | |
2226 | ||
2227 | return 0; | |
2228 | ||
2229 | err: | |
2230 | dev_err(dev, | |
2231 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2232 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2233 | ||
2234 | while (--i >= 0) | |
2235 | regulator_unregister_supply_alias(dev, id[i]); | |
2236 | ||
2237 | return ret; | |
2238 | } | |
2239 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2240 | ||
2241 | /** | |
2242 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2243 | * | |
2244 | * @dev: device that will be given as the regulator "consumer" | |
2245 | * @id: List of supply names or regulator IDs | |
2246 | * @num_id: Number of aliases to unregister | |
2247 | * | |
2248 | * This helper function allows drivers to unregister several supply | |
2249 | * aliases in one operation. | |
2250 | */ | |
2251 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2252 | const char *const *id, |
a06ccd9c CK |
2253 | int num_id) |
2254 | { | |
2255 | int i; | |
2256 | ||
2257 | for (i = 0; i < num_id; ++i) | |
2258 | regulator_unregister_supply_alias(dev, id[i]); | |
2259 | } | |
2260 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2261 | ||
2262 | ||
f19b00da KM |
2263 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2264 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2265 | const struct regulator_config *config) | |
2266 | { | |
467bf301 | 2267 | struct regulator_enable_gpio *pin, *new_pin; |
778b28b4 | 2268 | struct gpio_desc *gpiod; |
f19b00da | 2269 | |
541d052d | 2270 | gpiod = config->ena_gpiod; |
467bf301 MM |
2271 | new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL); |
2272 | ||
2273 | mutex_lock(®ulator_list_mutex); | |
778b28b4 | 2274 | |
f19b00da | 2275 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2276 | if (pin->gpiod == gpiod) { |
541d052d | 2277 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2278 | goto update_ena_gpio_to_rdev; |
2279 | } | |
2280 | } | |
2281 | ||
467bf301 MM |
2282 | if (new_pin == NULL) { |
2283 | mutex_unlock(®ulator_list_mutex); | |
f19b00da | 2284 | return -ENOMEM; |
467bf301 MM |
2285 | } |
2286 | ||
2287 | pin = new_pin; | |
2288 | new_pin = NULL; | |
f19b00da | 2289 | |
778b28b4 | 2290 | pin->gpiod = gpiod; |
f19b00da KM |
2291 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2292 | ||
2293 | update_ena_gpio_to_rdev: | |
2294 | pin->request_count++; | |
2295 | rdev->ena_pin = pin; | |
467bf301 MM |
2296 | |
2297 | mutex_unlock(®ulator_list_mutex); | |
2298 | kfree(new_pin); | |
2299 | ||
f19b00da KM |
2300 | return 0; |
2301 | } | |
2302 | ||
2303 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2304 | { | |
2305 | struct regulator_enable_gpio *pin, *n; | |
2306 | ||
2307 | if (!rdev->ena_pin) | |
2308 | return; | |
2309 | ||
2310 | /* Free the GPIO only in case of no use */ | |
2311 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
2dbf0855 MM |
2312 | if (pin != rdev->ena_pin) |
2313 | continue; | |
2314 | ||
2315 | if (--pin->request_count) | |
2316 | break; | |
2317 | ||
2318 | gpiod_put(pin->gpiod); | |
2319 | list_del(&pin->list); | |
2320 | kfree(pin); | |
2321 | break; | |
f19b00da | 2322 | } |
2dbf0855 MM |
2323 | |
2324 | rdev->ena_pin = NULL; | |
f19b00da KM |
2325 | } |
2326 | ||
967cfb18 | 2327 | /** |
31d6eebf RD |
2328 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2329 | * @rdev: regulator_dev structure | |
2330 | * @enable: enable GPIO at initial use? | |
2331 | * | |
967cfb18 KM |
2332 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2333 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2334 | */ | |
2335 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2336 | { | |
2337 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2338 | ||
2339 | if (!pin) | |
2340 | return -EINVAL; | |
2341 | ||
2342 | if (enable) { | |
2343 | /* Enable GPIO at initial use */ | |
2344 | if (pin->enable_count == 0) | |
01dc79cd | 2345 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2346 | |
2347 | pin->enable_count++; | |
2348 | } else { | |
2349 | if (pin->enable_count > 1) { | |
2350 | pin->enable_count--; | |
2351 | return 0; | |
2352 | } | |
2353 | ||
2354 | /* Disable GPIO if not used */ | |
2355 | if (pin->enable_count <= 1) { | |
01dc79cd | 2356 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2357 | pin->enable_count = 0; |
2358 | } | |
2359 | } | |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
79fd1141 GX |
2364 | /** |
2365 | * _regulator_enable_delay - a delay helper function | |
2366 | * @delay: time to delay in microseconds | |
2367 | * | |
2368 | * Delay for the requested amount of time as per the guidelines in: | |
2369 | * | |
458f69ef | 2370 | * Documentation/timers/timers-howto.rst |
79fd1141 GX |
2371 | * |
2372 | * The assumption here is that regulators will never be enabled in | |
2373 | * atomic context and therefore sleeping functions can be used. | |
2374 | */ | |
2375 | static void _regulator_enable_delay(unsigned int delay) | |
2376 | { | |
2377 | unsigned int ms = delay / 1000; | |
2378 | unsigned int us = delay % 1000; | |
2379 | ||
2380 | if (ms > 0) { | |
2381 | /* | |
2382 | * For small enough values, handle super-millisecond | |
2383 | * delays in the usleep_range() call below. | |
2384 | */ | |
2385 | if (ms < 20) | |
2386 | us += ms * 1000; | |
2387 | else | |
2388 | msleep(ms); | |
2389 | } | |
2390 | ||
2391 | /* | |
2392 | * Give the scheduler some room to coalesce with any other | |
2393 | * wakeup sources. For delays shorter than 10 us, don't even | |
2394 | * bother setting up high-resolution timers and just busy- | |
2395 | * loop. | |
2396 | */ | |
2397 | if (us >= 10) | |
2398 | usleep_range(us, us + 100); | |
2399 | else | |
2400 | udelay(us); | |
2401 | } | |
2402 | ||
f7d7ad42 SS |
2403 | /** |
2404 | * _regulator_check_status_enabled | |
2405 | * | |
2406 | * A helper function to check if the regulator status can be interpreted | |
2407 | * as 'regulator is enabled'. | |
2408 | * @rdev: the regulator device to check | |
2409 | * | |
2410 | * Return: | |
2411 | * * 1 - if status shows regulator is in enabled state | |
2412 | * * 0 - if not enabled state | |
2413 | * * Error Value - as received from ops->get_status() | |
2414 | */ | |
2415 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2416 | { | |
2417 | int ret = rdev->desc->ops->get_status(rdev); | |
2418 | ||
2419 | if (ret < 0) { | |
2420 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2421 | return ret; | |
2422 | } | |
2423 | ||
2424 | switch (ret) { | |
2425 | case REGULATOR_STATUS_OFF: | |
2426 | case REGULATOR_STATUS_ERROR: | |
2427 | case REGULATOR_STATUS_UNDEFINED: | |
2428 | return 0; | |
2429 | default: | |
2430 | return 1; | |
2431 | } | |
2432 | } | |
2433 | ||
5c5659d0 MB |
2434 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2435 | { | |
2436 | int ret, delay; | |
2437 | ||
2438 | /* Query before enabling in case configuration dependent. */ | |
2439 | ret = _regulator_get_enable_time(rdev); | |
2440 | if (ret >= 0) { | |
2441 | delay = ret; | |
2442 | } else { | |
2443 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2444 | delay = 0; | |
2445 | } | |
2446 | ||
2447 | trace_regulator_enable(rdev_get_name(rdev)); | |
2448 | ||
871f5650 GX |
2449 | if (rdev->desc->off_on_delay) { |
2450 | /* if needed, keep a distance of off_on_delay from last time | |
2451 | * this regulator was disabled. | |
2452 | */ | |
2453 | unsigned long start_jiffy = jiffies; | |
2454 | unsigned long intended, max_delay, remaining; | |
2455 | ||
2456 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2457 | intended = rdev->last_off_jiffy + max_delay; | |
2458 | ||
2459 | if (time_before(start_jiffy, intended)) { | |
2460 | /* calc remaining jiffies to deal with one-time | |
2461 | * timer wrapping. | |
2462 | * in case of multiple timer wrapping, either it can be | |
2463 | * detected by out-of-range remaining, or it cannot be | |
48f1b4ef | 2464 | * detected and we get a penalty of |
871f5650 GX |
2465 | * _regulator_enable_delay(). |
2466 | */ | |
2467 | remaining = intended - start_jiffy; | |
2468 | if (remaining <= max_delay) | |
2469 | _regulator_enable_delay( | |
2470 | jiffies_to_usecs(remaining)); | |
2471 | } | |
2472 | } | |
2473 | ||
967cfb18 | 2474 | if (rdev->ena_pin) { |
29d62ec5 DA |
2475 | if (!rdev->ena_gpio_state) { |
2476 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2477 | if (ret < 0) | |
2478 | return ret; | |
2479 | rdev->ena_gpio_state = 1; | |
2480 | } | |
65f73508 | 2481 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2482 | ret = rdev->desc->ops->enable(rdev); |
2483 | if (ret < 0) | |
2484 | return ret; | |
2485 | } else { | |
2486 | return -EINVAL; | |
2487 | } | |
2488 | ||
2489 | /* Allow the regulator to ramp; it would be useful to extend | |
2490 | * this for bulk operations so that the regulators can ramp | |
2491 | * together. */ | |
2492 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2493 | ||
f7d7ad42 SS |
2494 | /* If poll_enabled_time is set, poll upto the delay calculated |
2495 | * above, delaying poll_enabled_time uS to check if the regulator | |
2496 | * actually got enabled. | |
2497 | * If the regulator isn't enabled after enable_delay has | |
2498 | * expired, return -ETIMEDOUT. | |
2499 | */ | |
2500 | if (rdev->desc->poll_enabled_time) { | |
2501 | unsigned int time_remaining = delay; | |
2502 | ||
2503 | while (time_remaining > 0) { | |
2504 | _regulator_enable_delay(rdev->desc->poll_enabled_time); | |
2505 | ||
2506 | if (rdev->desc->ops->get_status) { | |
2507 | ret = _regulator_check_status_enabled(rdev); | |
2508 | if (ret < 0) | |
2509 | return ret; | |
2510 | else if (ret) | |
2511 | break; | |
2512 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2513 | break; | |
2514 | ||
2515 | time_remaining -= rdev->desc->poll_enabled_time; | |
2516 | } | |
2517 | ||
2518 | if (time_remaining <= 0) { | |
2519 | rdev_err(rdev, "Enabled check timed out\n"); | |
2520 | return -ETIMEDOUT; | |
2521 | } | |
2522 | } else { | |
2523 | _regulator_enable_delay(delay); | |
2524 | } | |
5c5659d0 MB |
2525 | |
2526 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
5451781d DA |
2531 | /** |
2532 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2533 | * @regulator: regulator source | |
2534 | * | |
2535 | * Some things on a regulator consumer (like the contribution towards total | |
2536 | * load on the regulator) only have an effect when the consumer wants the | |
2537 | * regulator enabled. Explained in example with two consumers of the same | |
2538 | * regulator: | |
2539 | * consumer A: set_load(100); => total load = 0 | |
2540 | * consumer A: regulator_enable(); => total load = 100 | |
2541 | * consumer B: set_load(1000); => total load = 100 | |
2542 | * consumer B: regulator_enable(); => total load = 1100 | |
2543 | * consumer A: regulator_disable(); => total_load = 1000 | |
2544 | * | |
2545 | * This function (together with _regulator_handle_consumer_disable) is | |
2546 | * responsible for keeping track of the refcount for a given regulator consumer | |
2547 | * and applying / unapplying these things. | |
2548 | * | |
2549 | * Returns 0 upon no error; -error upon error. | |
2550 | */ | |
2551 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2552 | { | |
2553 | struct regulator_dev *rdev = regulator->rdev; | |
2554 | ||
2555 | lockdep_assert_held_once(&rdev->mutex.base); | |
2556 | ||
2557 | regulator->enable_count++; | |
2558 | if (regulator->uA_load && regulator->enable_count == 1) | |
2559 | return drms_uA_update(rdev); | |
2560 | ||
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | /** | |
2565 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2566 | * @regulator: regulator source | |
2567 | * | |
2568 | * The opposite of _regulator_handle_consumer_enable(). | |
2569 | * | |
2570 | * Returns 0 upon no error; -error upon error. | |
2571 | */ | |
2572 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2573 | { | |
2574 | struct regulator_dev *rdev = regulator->rdev; | |
2575 | ||
2576 | lockdep_assert_held_once(&rdev->mutex.base); | |
2577 | ||
2578 | if (!regulator->enable_count) { | |
2579 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2580 | return -EINVAL; | |
2581 | } | |
2582 | ||
2583 | regulator->enable_count--; | |
2584 | if (regulator->uA_load && regulator->enable_count == 0) | |
2585 | return drms_uA_update(rdev); | |
2586 | ||
2587 | return 0; | |
2588 | } | |
2589 | ||
414c70cb | 2590 | /* locks held by regulator_enable() */ |
5451781d | 2591 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2592 | { |
5451781d | 2593 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2594 | int ret; |
414c70cb | 2595 | |
f8702f9e DO |
2596 | lockdep_assert_held_once(&rdev->mutex.base); |
2597 | ||
1fc12b05 | 2598 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2599 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2600 | if (ret < 0) |
2601 | return ret; | |
2602 | } | |
2603 | ||
2604 | /* balance only if there are regulators coupled */ | |
2605 | if (rdev->coupling_desc.n_coupled > 1) { | |
2606 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2607 | if (ret < 0) | |
2608 | goto err_disable_supply; | |
2609 | } | |
70cfef26 | 2610 | |
5451781d DA |
2611 | ret = _regulator_handle_consumer_enable(regulator); |
2612 | if (ret < 0) | |
2613 | goto err_disable_supply; | |
414c70cb | 2614 | |
9a2372fa MB |
2615 | if (rdev->use_count == 0) { |
2616 | /* The regulator may on if it's not switchable or left on */ | |
2617 | ret = _regulator_is_enabled(rdev); | |
2618 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2619 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2620 | REGULATOR_CHANGE_STATUS)) { |
2621 | ret = -EPERM; | |
5451781d | 2622 | goto err_consumer_disable; |
f8702f9e | 2623 | } |
9a2372fa | 2624 | |
5c5659d0 | 2625 | ret = _regulator_do_enable(rdev); |
31aae2be | 2626 | if (ret < 0) |
5451781d | 2627 | goto err_consumer_disable; |
31aae2be | 2628 | |
264b88c9 HG |
2629 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2630 | NULL); | |
a7433cff | 2631 | } else if (ret < 0) { |
5da84fd9 | 2632 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
5451781d | 2633 | goto err_consumer_disable; |
414c70cb | 2634 | } |
a7433cff | 2635 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2636 | } |
2637 | ||
9a2372fa MB |
2638 | rdev->use_count++; |
2639 | ||
2640 | return 0; | |
f8702f9e | 2641 | |
5451781d DA |
2642 | err_consumer_disable: |
2643 | _regulator_handle_consumer_disable(regulator); | |
2644 | ||
f8702f9e | 2645 | err_disable_supply: |
1fc12b05 | 2646 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2647 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2648 | |
2649 | return ret; | |
414c70cb LG |
2650 | } |
2651 | ||
2652 | /** | |
2653 | * regulator_enable - enable regulator output | |
2654 | * @regulator: regulator source | |
2655 | * | |
cf7bbcdf MB |
2656 | * Request that the regulator be enabled with the regulator output at |
2657 | * the predefined voltage or current value. Calls to regulator_enable() | |
2658 | * must be balanced with calls to regulator_disable(). | |
2659 | * | |
414c70cb | 2660 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2661 | * hardwired in the regulator. |
414c70cb LG |
2662 | */ |
2663 | int regulator_enable(struct regulator *regulator) | |
2664 | { | |
412aec61 | 2665 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2666 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2667 | int ret; |
6492bc1b | 2668 | |
f8702f9e | 2669 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2670 | ret = _regulator_enable(regulator); |
f8702f9e | 2671 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2672 | |
414c70cb LG |
2673 | return ret; |
2674 | } | |
2675 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2676 | ||
5c5659d0 MB |
2677 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2678 | { | |
2679 | int ret; | |
2680 | ||
2681 | trace_regulator_disable(rdev_get_name(rdev)); | |
2682 | ||
967cfb18 | 2683 | if (rdev->ena_pin) { |
29d62ec5 DA |
2684 | if (rdev->ena_gpio_state) { |
2685 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2686 | if (ret < 0) | |
2687 | return ret; | |
2688 | rdev->ena_gpio_state = 0; | |
2689 | } | |
5c5659d0 MB |
2690 | |
2691 | } else if (rdev->desc->ops->disable) { | |
2692 | ret = rdev->desc->ops->disable(rdev); | |
2693 | if (ret != 0) | |
2694 | return ret; | |
2695 | } | |
2696 | ||
871f5650 GX |
2697 | /* cares about last_off_jiffy only if off_on_delay is required by |
2698 | * device. | |
2699 | */ | |
2700 | if (rdev->desc->off_on_delay) | |
2701 | rdev->last_off_jiffy = jiffies; | |
2702 | ||
5c5659d0 MB |
2703 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2704 | ||
5c5659d0 MB |
2705 | return 0; |
2706 | } | |
2707 | ||
414c70cb | 2708 | /* locks held by regulator_disable() */ |
5451781d | 2709 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2710 | { |
5451781d | 2711 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2712 | int ret = 0; |
2713 | ||
f8702f9e | 2714 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2715 | |
cd94b505 | 2716 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2717 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2718 | return -EIO; |
2719 | ||
414c70cb | 2720 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2721 | if (rdev->use_count == 1 && |
2722 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2723 | |
2724 | /* we are last user */ | |
8a34e979 | 2725 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2726 | ret = _notifier_call_chain(rdev, |
2727 | REGULATOR_EVENT_PRE_DISABLE, | |
2728 | NULL); | |
2729 | if (ret & NOTIFY_STOP_MASK) | |
2730 | return -EINVAL; | |
2731 | ||
5c5659d0 | 2732 | ret = _regulator_do_disable(rdev); |
414c70cb | 2733 | if (ret < 0) { |
5da84fd9 | 2734 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2735 | _notifier_call_chain(rdev, |
2736 | REGULATOR_EVENT_ABORT_DISABLE, | |
2737 | NULL); | |
414c70cb LG |
2738 | return ret; |
2739 | } | |
66fda75f MP |
2740 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2741 | NULL); | |
414c70cb LG |
2742 | } |
2743 | ||
414c70cb LG |
2744 | rdev->use_count = 0; |
2745 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2746 | rdev->use_count--; |
2747 | } | |
3801b86a | 2748 | |
5451781d DA |
2749 | if (ret == 0) |
2750 | ret = _regulator_handle_consumer_disable(regulator); | |
2751 | ||
f8702f9e DO |
2752 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2753 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2754 | ||
1fc12b05 | 2755 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2756 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2757 | |
414c70cb LG |
2758 | return ret; |
2759 | } | |
2760 | ||
2761 | /** | |
2762 | * regulator_disable - disable regulator output | |
2763 | * @regulator: regulator source | |
2764 | * | |
cf7bbcdf MB |
2765 | * Disable the regulator output voltage or current. Calls to |
2766 | * regulator_enable() must be balanced with calls to | |
2767 | * regulator_disable(). | |
69279fb9 | 2768 | * |
414c70cb | 2769 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2770 | * devices have it enabled, the regulator device supports disabling and |
2771 | * machine constraints permit this operation. | |
414c70cb LG |
2772 | */ |
2773 | int regulator_disable(struct regulator *regulator) | |
2774 | { | |
412aec61 | 2775 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2776 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2777 | int ret; |
6492bc1b | 2778 | |
f8702f9e | 2779 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2780 | ret = _regulator_disable(regulator); |
f8702f9e | 2781 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2782 | |
414c70cb LG |
2783 | return ret; |
2784 | } | |
2785 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2786 | ||
2787 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2788 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2789 | { |
2790 | int ret = 0; | |
2791 | ||
f8702f9e | 2792 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2793 | |
a1c8a551 RF |
2794 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2795 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2796 | if (ret & NOTIFY_STOP_MASK) | |
2797 | return -EINVAL; | |
2798 | ||
66fda75f MP |
2799 | ret = _regulator_do_disable(rdev); |
2800 | if (ret < 0) { | |
2801 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2802 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2803 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2804 | return ret; |
414c70cb LG |
2805 | } |
2806 | ||
66fda75f MP |
2807 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2808 | REGULATOR_EVENT_DISABLE, NULL); | |
2809 | ||
2810 | return 0; | |
414c70cb LG |
2811 | } |
2812 | ||
2813 | /** | |
2814 | * regulator_force_disable - force disable regulator output | |
2815 | * @regulator: regulator source | |
2816 | * | |
2817 | * Forcibly disable the regulator output voltage or current. | |
2818 | * NOTE: this *will* disable the regulator output even if other consumer | |
2819 | * devices have it enabled. This should be used for situations when device | |
2820 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2821 | */ | |
2822 | int regulator_force_disable(struct regulator *regulator) | |
2823 | { | |
82d15839 | 2824 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2825 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2826 | int ret; |
2827 | ||
f8702f9e | 2828 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2829 | |
3801b86a | 2830 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2831 | |
9243a195 MP |
2832 | if (rdev->coupling_desc.n_coupled > 1) |
2833 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2834 | |
2835 | if (regulator->uA_load) { | |
2836 | regulator->uA_load = 0; | |
2837 | ret = drms_uA_update(rdev); | |
2838 | } | |
2839 | ||
1fc12b05 DA |
2840 | if (rdev->use_count != 0 && rdev->supply) |
2841 | _regulator_disable(rdev->supply); | |
8cbf811d | 2842 | |
1fc12b05 | 2843 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2844 | |
414c70cb LG |
2845 | return ret; |
2846 | } | |
2847 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2848 | ||
da07ecd9 MB |
2849 | static void regulator_disable_work(struct work_struct *work) |
2850 | { | |
2851 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2852 | disable_work.work); | |
f8702f9e | 2853 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2854 | int count, i, ret; |
5451781d DA |
2855 | struct regulator *regulator; |
2856 | int total_count = 0; | |
da07ecd9 | 2857 | |
f8702f9e | 2858 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2859 | |
c9ccaa0c TR |
2860 | /* |
2861 | * Workqueue functions queue the new work instance while the previous | |
2862 | * work instance is being processed. Cancel the queued work instance | |
2863 | * as the work instance under processing does the job of the queued | |
2864 | * work instance. | |
2865 | */ | |
2866 | cancel_delayed_work(&rdev->disable_work); | |
2867 | ||
5451781d DA |
2868 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2869 | count = regulator->deferred_disables; | |
2870 | ||
2871 | if (!count) | |
2872 | continue; | |
2873 | ||
2874 | total_count += count; | |
2875 | regulator->deferred_disables = 0; | |
2876 | ||
2877 | for (i = 0; i < count; i++) { | |
2878 | ret = _regulator_disable(regulator); | |
2879 | if (ret != 0) | |
2880 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2881 | } | |
da07ecd9 | 2882 | } |
5451781d | 2883 | WARN_ON(!total_count); |
da07ecd9 | 2884 | |
f8702f9e DO |
2885 | if (rdev->coupling_desc.n_coupled > 1) |
2886 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2887 | ||
2888 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2889 | } |
2890 | ||
2891 | /** | |
2892 | * regulator_disable_deferred - disable regulator output with delay | |
2893 | * @regulator: regulator source | |
48f1b4ef | 2894 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
2895 | * |
2896 | * Execute regulator_disable() on the regulator after a delay. This | |
2897 | * is intended for use with devices that require some time to quiesce. | |
2898 | * | |
2899 | * NOTE: this will only disable the regulator output if no other consumer | |
2900 | * devices have it enabled, the regulator device supports disabling and | |
2901 | * machine constraints permit this operation. | |
2902 | */ | |
2903 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2904 | { | |
2905 | struct regulator_dev *rdev = regulator->rdev; | |
2906 | ||
2b5a24a0 MB |
2907 | if (!ms) |
2908 | return regulator_disable(regulator); | |
2909 | ||
66cf9a7e | 2910 | regulator_lock(rdev); |
5451781d | 2911 | regulator->deferred_disables++; |
c9ccaa0c TR |
2912 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2913 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2914 | regulator_unlock(rdev); |
da07ecd9 | 2915 | |
70dc6daf | 2916 | return 0; |
da07ecd9 MB |
2917 | } |
2918 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2919 | ||
414c70cb LG |
2920 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2921 | { | |
65f73508 | 2922 | /* A GPIO control always takes precedence */ |
7b74d149 | 2923 | if (rdev->ena_pin) |
65f73508 MB |
2924 | return rdev->ena_gpio_state; |
2925 | ||
9a7f6a4c | 2926 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2927 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2928 | return 1; |
414c70cb | 2929 | |
9332546f | 2930 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2931 | } |
2932 | ||
3d67fe95 MP |
2933 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2934 | unsigned selector, int lock) | |
3a40cfc3 | 2935 | { |
3a40cfc3 SH |
2936 | const struct regulator_ops *ops = rdev->desc->ops; |
2937 | int ret; | |
2938 | ||
2939 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2940 | return rdev->desc->fixed_uV; | |
2941 | ||
2942 | if (ops->list_voltage) { | |
2943 | if (selector >= rdev->desc->n_voltages) | |
2944 | return -EINVAL; | |
2945 | if (lock) | |
66cf9a7e | 2946 | regulator_lock(rdev); |
3a40cfc3 SH |
2947 | ret = ops->list_voltage(rdev, selector); |
2948 | if (lock) | |
66cf9a7e | 2949 | regulator_unlock(rdev); |
fd086045 | 2950 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2951 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2952 | selector, lock); | |
3a40cfc3 SH |
2953 | } else { |
2954 | return -EINVAL; | |
2955 | } | |
2956 | ||
2957 | if (ret > 0) { | |
2958 | if (ret < rdev->constraints->min_uV) | |
2959 | ret = 0; | |
2960 | else if (ret > rdev->constraints->max_uV) | |
2961 | ret = 0; | |
2962 | } | |
2963 | ||
2964 | return ret; | |
2965 | } | |
2966 | ||
414c70cb LG |
2967 | /** |
2968 | * regulator_is_enabled - is the regulator output enabled | |
2969 | * @regulator: regulator source | |
2970 | * | |
412aec61 DB |
2971 | * Returns positive if the regulator driver backing the source/client |
2972 | * has requested that the device be enabled, zero if it hasn't, else a | |
2973 | * negative errno code. | |
2974 | * | |
2975 | * Note that the device backing this regulator handle can have multiple | |
2976 | * users, so it might be enabled even if regulator_enable() was never | |
2977 | * called for this particular source. | |
414c70cb LG |
2978 | */ |
2979 | int regulator_is_enabled(struct regulator *regulator) | |
2980 | { | |
9332546f MB |
2981 | int ret; |
2982 | ||
6492bc1b MB |
2983 | if (regulator->always_on) |
2984 | return 1; | |
2985 | ||
f8702f9e | 2986 | regulator_lock(regulator->rdev); |
9332546f | 2987 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 2988 | regulator_unlock(regulator->rdev); |
9332546f MB |
2989 | |
2990 | return ret; | |
414c70cb LG |
2991 | } |
2992 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2993 | ||
4367cfdc DB |
2994 | /** |
2995 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2996 | * @regulator: regulator source | |
2997 | * | |
2998 | * Returns number of selectors, or negative errno. Selectors are | |
2999 | * numbered starting at zero, and typically correspond to bitfields | |
3000 | * in hardware registers. | |
3001 | */ | |
3002 | int regulator_count_voltages(struct regulator *regulator) | |
3003 | { | |
3004 | struct regulator_dev *rdev = regulator->rdev; | |
3005 | ||
26988efe JMC |
3006 | if (rdev->desc->n_voltages) |
3007 | return rdev->desc->n_voltages; | |
3008 | ||
fd086045 | 3009 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
3010 | return -EINVAL; |
3011 | ||
3012 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
3013 | } |
3014 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
3015 | ||
3016 | /** | |
3017 | * regulator_list_voltage - enumerate supported voltages | |
3018 | * @regulator: regulator source | |
3019 | * @selector: identify voltage to list | |
3020 | * Context: can sleep | |
3021 | * | |
3022 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 3023 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
3024 | * negative errno. |
3025 | */ | |
3026 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
3027 | { | |
3d67fe95 | 3028 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
3029 | } |
3030 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
3031 | ||
04eca28c TT |
3032 | /** |
3033 | * regulator_get_regmap - get the regulator's register map | |
3034 | * @regulator: regulator source | |
3035 | * | |
3036 | * Returns the register map for the given regulator, or an ERR_PTR value | |
3037 | * if the regulator doesn't use regmap. | |
3038 | */ | |
3039 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
3040 | { | |
3041 | struct regmap *map = regulator->rdev->regmap; | |
3042 | ||
3043 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
3044 | } | |
3045 | ||
3046 | /** | |
3047 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3048 | * @regulator: regulator source | |
3049 | * @vsel_reg: voltage selector register, output parameter | |
3050 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3051 | * | |
3052 | * Returns the hardware register offset and bitmask used for setting the | |
3053 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3054 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3055 | * for example. | |
3056 | * | |
3057 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3058 | * and 0 is returned, otherwise a negative errno is returned. | |
3059 | */ | |
3060 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3061 | unsigned *vsel_reg, | |
3062 | unsigned *vsel_mask) | |
3063 | { | |
39f5460d GX |
3064 | struct regulator_dev *rdev = regulator->rdev; |
3065 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3066 | |
3067 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3068 | return -EOPNOTSUPP; | |
3069 | ||
0d5c8633 CIK |
3070 | *vsel_reg = rdev->desc->vsel_reg; |
3071 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c | 3072 | |
be35cc46 | 3073 | return 0; |
04eca28c TT |
3074 | } |
3075 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3076 | ||
3077 | /** | |
3078 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3079 | * @regulator: regulator source | |
3080 | * @selector: identify voltage to list | |
3081 | * | |
3082 | * Converts the selector to a hardware-specific voltage selector that can be | |
3083 | * directly written to the regulator registers. The address of the voltage | |
3084 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3085 | * | |
3086 | * On error a negative errno is returned. | |
3087 | */ | |
3088 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3089 | unsigned selector) | |
3090 | { | |
39f5460d GX |
3091 | struct regulator_dev *rdev = regulator->rdev; |
3092 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3093 | |
3094 | if (selector >= rdev->desc->n_voltages) | |
3095 | return -EINVAL; | |
3096 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3097 | return -EOPNOTSUPP; | |
3098 | ||
3099 | return selector; | |
3100 | } | |
3101 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3102 | ||
2a668a8b PW |
3103 | /** |
3104 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3105 | * @regulator: regulator source | |
3106 | * | |
3107 | * Returns the voltage step size between VSEL values for linear | |
3108 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3109 | */ | |
3110 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3111 | { | |
3112 | struct regulator_dev *rdev = regulator->rdev; | |
3113 | ||
3114 | return rdev->desc->uV_step; | |
3115 | } | |
3116 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3117 | ||
a7a1ad90 MB |
3118 | /** |
3119 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3120 | * | |
3121 | * @regulator: Regulator to check. | |
3122 | * @min_uV: Minimum required voltage in uV. | |
3123 | * @max_uV: Maximum required voltage in uV. | |
3124 | * | |
49820944 | 3125 | * Returns a boolean. |
a7a1ad90 MB |
3126 | */ |
3127 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3128 | int min_uV, int max_uV) | |
3129 | { | |
c5f3939b | 3130 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3131 | int i, voltages, ret; |
3132 | ||
c5f3939b | 3133 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3134 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3135 | ret = regulator_get_voltage(regulator); |
3136 | if (ret >= 0) | |
0d25d09d | 3137 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3138 | else |
3139 | return ret; | |
3140 | } | |
3141 | ||
bd7a2b60 PM |
3142 | /* Any voltage within constrains range is fine? */ |
3143 | if (rdev->desc->continuous_voltage_range) | |
3144 | return min_uV >= rdev->constraints->min_uV && | |
3145 | max_uV <= rdev->constraints->max_uV; | |
3146 | ||
a7a1ad90 MB |
3147 | ret = regulator_count_voltages(regulator); |
3148 | if (ret < 0) | |
49820944 | 3149 | return 0; |
a7a1ad90 MB |
3150 | voltages = ret; |
3151 | ||
3152 | for (i = 0; i < voltages; i++) { | |
3153 | ret = regulator_list_voltage(regulator, i); | |
3154 | ||
3155 | if (ret >= min_uV && ret <= max_uV) | |
3156 | return 1; | |
3157 | } | |
3158 | ||
3159 | return 0; | |
3160 | } | |
a398eaa2 | 3161 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3162 | |
a204f41e SH |
3163 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3164 | int max_uV) | |
3165 | { | |
3166 | const struct regulator_desc *desc = rdev->desc; | |
3167 | ||
3168 | if (desc->ops->map_voltage) | |
3169 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3170 | ||
3171 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3172 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3173 | ||
3174 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3175 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3176 | ||
18e4b55f MV |
3177 | if (desc->ops->list_voltage == |
3178 | regulator_list_voltage_pickable_linear_range) | |
3179 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3180 | min_uV, max_uV); | |
3181 | ||
a204f41e SH |
3182 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3183 | } | |
3184 | ||
7179569a HS |
3185 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3186 | int min_uV, int max_uV, | |
3187 | unsigned *selector) | |
3188 | { | |
3189 | struct pre_voltage_change_data data; | |
3190 | int ret; | |
3191 | ||
d22b85a1 | 3192 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3193 | data.min_uV = min_uV; |
3194 | data.max_uV = max_uV; | |
3195 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3196 | &data); | |
3197 | if (ret & NOTIFY_STOP_MASK) | |
3198 | return -EINVAL; | |
3199 | ||
3200 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3201 | if (ret >= 0) | |
3202 | return ret; | |
3203 | ||
3204 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3205 | (void *)data.old_uV); | |
3206 | ||
3207 | return ret; | |
3208 | } | |
3209 | ||
3210 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3211 | int uV, unsigned selector) | |
3212 | { | |
3213 | struct pre_voltage_change_data data; | |
3214 | int ret; | |
3215 | ||
d22b85a1 | 3216 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3217 | data.min_uV = uV; |
3218 | data.max_uV = uV; | |
3219 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3220 | &data); | |
3221 | if (ret & NOTIFY_STOP_MASK) | |
3222 | return -EINVAL; | |
3223 | ||
3224 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3225 | if (ret >= 0) | |
3226 | return ret; | |
3227 | ||
3228 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3229 | (void *)data.old_uV); | |
3230 | ||
3231 | return ret; | |
3232 | } | |
3233 | ||
2da8d947 BG |
3234 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3235 | int uV, int new_selector) | |
3236 | { | |
3237 | const struct regulator_ops *ops = rdev->desc->ops; | |
3238 | int diff, old_sel, curr_sel, ret; | |
3239 | ||
3240 | /* Stepping is only needed if the regulator is enabled. */ | |
3241 | if (!_regulator_is_enabled(rdev)) | |
3242 | goto final_set; | |
3243 | ||
3244 | if (!ops->get_voltage_sel) | |
3245 | return -EINVAL; | |
3246 | ||
3247 | old_sel = ops->get_voltage_sel(rdev); | |
3248 | if (old_sel < 0) | |
3249 | return old_sel; | |
3250 | ||
3251 | diff = new_selector - old_sel; | |
3252 | if (diff == 0) | |
3253 | return 0; /* No change needed. */ | |
3254 | ||
3255 | if (diff > 0) { | |
3256 | /* Stepping up. */ | |
3257 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3258 | curr_sel < new_selector; | |
3259 | curr_sel += rdev->desc->vsel_step) { | |
3260 | /* | |
3261 | * Call the callback directly instead of using | |
3262 | * _regulator_call_set_voltage_sel() as we don't | |
3263 | * want to notify anyone yet. Same in the branch | |
3264 | * below. | |
3265 | */ | |
3266 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3267 | if (ret) | |
3268 | goto try_revert; | |
3269 | } | |
3270 | } else { | |
3271 | /* Stepping down. */ | |
3272 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3273 | curr_sel > new_selector; | |
3274 | curr_sel -= rdev->desc->vsel_step) { | |
3275 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3276 | if (ret) | |
3277 | goto try_revert; | |
3278 | } | |
3279 | } | |
3280 | ||
3281 | final_set: | |
3282 | /* The final selector will trigger the notifiers. */ | |
3283 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3284 | ||
3285 | try_revert: | |
3286 | /* | |
3287 | * At least try to return to the previous voltage if setting a new | |
3288 | * one failed. | |
3289 | */ | |
3290 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3291 | return ret; | |
3292 | } | |
3293 | ||
73e705bf MK |
3294 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3295 | int old_uV, int new_uV) | |
3296 | { | |
3297 | unsigned int ramp_delay = 0; | |
3298 | ||
3299 | if (rdev->constraints->ramp_delay) | |
3300 | ramp_delay = rdev->constraints->ramp_delay; | |
3301 | else if (rdev->desc->ramp_delay) | |
3302 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3303 | else if (rdev->constraints->settling_time) |
3304 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3305 | else if (rdev->constraints->settling_time_up && |
3306 | (new_uV > old_uV)) | |
3307 | return rdev->constraints->settling_time_up; | |
3308 | else if (rdev->constraints->settling_time_down && | |
3309 | (new_uV < old_uV)) | |
3310 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3311 | |
3312 | if (ramp_delay == 0) { | |
ba14fa1a | 3313 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3314 | return 0; |
3315 | } | |
3316 | ||
3317 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3318 | } | |
3319 | ||
75790251 MB |
3320 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3321 | int min_uV, int max_uV) | |
3322 | { | |
3323 | int ret; | |
77af1b26 | 3324 | int delay = 0; |
e113d792 | 3325 | int best_val = 0; |
75790251 | 3326 | unsigned int selector; |
eba41a5e | 3327 | int old_selector = -1; |
57995a48 | 3328 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3329 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3330 | |
3331 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3332 | ||
bf5892a8 MB |
3333 | min_uV += rdev->constraints->uV_offset; |
3334 | max_uV += rdev->constraints->uV_offset; | |
3335 | ||
eba41a5e AL |
3336 | /* |
3337 | * If we can't obtain the old selector there is not enough | |
3338 | * info to call set_voltage_time_sel(). | |
3339 | */ | |
8b7485ef | 3340 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3341 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3342 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3343 | if (old_selector < 0) |
3344 | return old_selector; | |
3345 | } | |
3346 | ||
57995a48 | 3347 | if (ops->set_voltage) { |
7179569a HS |
3348 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3349 | &selector); | |
e113d792 MB |
3350 | |
3351 | if (ret >= 0) { | |
57995a48 MK |
3352 | if (ops->list_voltage) |
3353 | best_val = ops->list_voltage(rdev, | |
3354 | selector); | |
e113d792 | 3355 | else |
d22b85a1 | 3356 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3357 | } |
3358 | ||
57995a48 | 3359 | } else if (ops->set_voltage_sel) { |
a204f41e | 3360 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3361 | if (ret >= 0) { |
57995a48 | 3362 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3363 | if (min_uV <= best_val && max_uV >= best_val) { |
3364 | selector = ret; | |
c66a566a AL |
3365 | if (old_selector == selector) |
3366 | ret = 0; | |
2da8d947 BG |
3367 | else if (rdev->desc->vsel_step) |
3368 | ret = _regulator_set_voltage_sel_step( | |
3369 | rdev, best_val, selector); | |
c66a566a | 3370 | else |
7179569a HS |
3371 | ret = _regulator_call_set_voltage_sel( |
3372 | rdev, best_val, selector); | |
e113d792 MB |
3373 | } else { |
3374 | ret = -EINVAL; | |
3375 | } | |
e8eef82b | 3376 | } |
75790251 MB |
3377 | } else { |
3378 | ret = -EINVAL; | |
3379 | } | |
e8eef82b | 3380 | |
31dfe686 MK |
3381 | if (ret) |
3382 | goto out; | |
77af1b26 | 3383 | |
73e705bf MK |
3384 | if (ops->set_voltage_time_sel) { |
3385 | /* | |
3386 | * Call set_voltage_time_sel if successfully obtained | |
3387 | * old_selector | |
3388 | */ | |
3389 | if (old_selector >= 0 && old_selector != selector) | |
3390 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3391 | selector); | |
3392 | } else { | |
3393 | if (old_uV != best_val) { | |
3394 | if (ops->set_voltage_time) | |
3395 | delay = ops->set_voltage_time(rdev, old_uV, | |
3396 | best_val); | |
3397 | else | |
3398 | delay = _regulator_set_voltage_time(rdev, | |
3399 | old_uV, | |
3400 | best_val); | |
e8eef82b | 3401 | } |
73e705bf | 3402 | } |
75790251 | 3403 | |
73e705bf MK |
3404 | if (delay < 0) { |
3405 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
3406 | delay = 0; | |
77af1b26 LW |
3407 | } |
3408 | ||
73e705bf MK |
3409 | /* Insert any necessary delays */ |
3410 | if (delay >= 1000) { | |
3411 | mdelay(delay / 1000); | |
3412 | udelay(delay % 1000); | |
3413 | } else if (delay) { | |
3414 | udelay(delay); | |
77af1b26 LW |
3415 | } |
3416 | ||
31dfe686 | 3417 | if (best_val >= 0) { |
2f6c797f AL |
3418 | unsigned long data = best_val; |
3419 | ||
ded06a52 | 3420 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3421 | (void *)data); |
3422 | } | |
ded06a52 | 3423 | |
31dfe686 | 3424 | out: |
eba41a5e | 3425 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3426 | |
3427 | return ret; | |
3428 | } | |
3429 | ||
f7efad10 CZ |
3430 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3431 | int min_uV, int max_uV, suspend_state_t state) | |
3432 | { | |
3433 | struct regulator_state *rstate; | |
3434 | int uV, sel; | |
3435 | ||
3436 | rstate = regulator_get_suspend_state(rdev, state); | |
3437 | if (rstate == NULL) | |
3438 | return -EINVAL; | |
3439 | ||
3440 | if (min_uV < rstate->min_uV) | |
3441 | min_uV = rstate->min_uV; | |
3442 | if (max_uV > rstate->max_uV) | |
3443 | max_uV = rstate->max_uV; | |
3444 | ||
3445 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3446 | if (sel < 0) | |
3447 | return sel; | |
3448 | ||
3449 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3450 | if (uV >= min_uV && uV <= max_uV) | |
3451 | rstate->uV = uV; | |
3452 | ||
3453 | return 0; | |
3454 | } | |
3455 | ||
a9f226bc | 3456 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3457 | int min_uV, int max_uV, |
3458 | suspend_state_t state) | |
414c70cb LG |
3459 | { |
3460 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3461 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3462 | int ret = 0; |
92d7a558 | 3463 | int old_min_uV, old_max_uV; |
c00dc359 | 3464 | int current_uV; |
414c70cb | 3465 | |
95a3c23a MB |
3466 | /* If we're setting the same range as last time the change |
3467 | * should be a noop (some cpufreq implementations use the same | |
3468 | * voltage for multiple frequencies, for example). | |
3469 | */ | |
c360a6df | 3470 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3471 | goto out; |
3472 | ||
c00dc359 | 3473 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3474 | * return successfully even though the regulator does not support |
c00dc359 BA |
3475 | * changing the voltage. |
3476 | */ | |
8a34e979 | 3477 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3478 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3479 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3480 | voltage->min_uV = min_uV; |
3481 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3482 | goto out; |
3483 | } | |
3484 | } | |
3485 | ||
414c70cb | 3486 | /* sanity check */ |
e8eef82b MB |
3487 | if (!rdev->desc->ops->set_voltage && |
3488 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3489 | ret = -EINVAL; |
3490 | goto out; | |
3491 | } | |
3492 | ||
3493 | /* constraints check */ | |
3494 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3495 | if (ret < 0) | |
3496 | goto out; | |
0d25d09d | 3497 | |
92d7a558 | 3498 | /* restore original values in case of error */ |
c360a6df CZ |
3499 | old_min_uV = voltage->min_uV; |
3500 | old_max_uV = voltage->max_uV; | |
3501 | voltage->min_uV = min_uV; | |
3502 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3503 | |
9243a195 MP |
3504 | /* for not coupled regulators this will just set the voltage */ |
3505 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3506 | if (ret < 0) { |
3507 | voltage->min_uV = old_min_uV; | |
3508 | voltage->max_uV = old_max_uV; | |
3509 | } | |
05fda3b1 | 3510 | |
9243a195 | 3511 | out: |
9243a195 MP |
3512 | return ret; |
3513 | } | |
3514 | ||
d22b85a1 DO |
3515 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3516 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3517 | { |
3518 | int best_supply_uV = 0; | |
3519 | int supply_change_uV = 0; | |
3520 | int ret; | |
3521 | ||
43fc99f2 MB |
3522 | if (rdev->supply && |
3523 | regulator_ops_is_valid(rdev->supply->rdev, | |
3524 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3525 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3526 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3527 | int current_supply_uV; |
3528 | int selector; | |
3529 | ||
3530 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3531 | if (selector < 0) { | |
3532 | ret = selector; | |
9243a195 | 3533 | goto out; |
fc42112c SH |
3534 | } |
3535 | ||
00cb9f4f | 3536 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3537 | if (best_supply_uV < 0) { |
3538 | ret = best_supply_uV; | |
9243a195 | 3539 | goto out; |
fc42112c SH |
3540 | } |
3541 | ||
3542 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3543 | ||
d22b85a1 | 3544 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3545 | if (current_supply_uV < 0) { |
3546 | ret = current_supply_uV; | |
9243a195 | 3547 | goto out; |
fc42112c SH |
3548 | } |
3549 | ||
3550 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3551 | } | |
3552 | ||
3553 | if (supply_change_uV > 0) { | |
3554 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3555 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3556 | if (ret) { |
3557 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3558 | ret); | |
9243a195 | 3559 | goto out; |
fc42112c SH |
3560 | } |
3561 | } | |
3562 | ||
f7efad10 CZ |
3563 | if (state == PM_SUSPEND_ON) |
3564 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3565 | else | |
3566 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3567 | max_uV, state); | |
92d7a558 | 3568 | if (ret < 0) |
9243a195 | 3569 | goto out; |
0d25d09d | 3570 | |
fc42112c SH |
3571 | if (supply_change_uV < 0) { |
3572 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3573 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3574 | if (ret) |
3575 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3576 | ret); | |
3577 | /* No need to fail here */ | |
3578 | ret = 0; | |
3579 | } | |
3580 | ||
414c70cb | 3581 | out: |
a9f226bc | 3582 | return ret; |
69686176 | 3583 | } |
3d7610e8 | 3584 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3585 | |
85254bcf DO |
3586 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3587 | int *current_uV, int *min_uV) | |
3588 | { | |
3589 | struct regulation_constraints *constraints = rdev->constraints; | |
3590 | ||
3591 | /* Limit voltage change only if necessary */ | |
3592 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3593 | return 1; | |
3594 | ||
3595 | if (*current_uV < 0) { | |
d22b85a1 | 3596 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3597 | |
3598 | if (*current_uV < 0) | |
3599 | return *current_uV; | |
3600 | } | |
3601 | ||
3602 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3603 | return 1; | |
3604 | ||
3605 | /* Clamp target voltage within the given step */ | |
3606 | if (*current_uV < *min_uV) | |
3607 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3608 | *min_uV); | |
3609 | else | |
3610 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3611 | *min_uV); | |
3612 | ||
3613 | return 0; | |
3614 | } | |
3615 | ||
c054c6c7 MP |
3616 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3617 | int *current_uV, | |
3618 | int *min_uV, int *max_uV, | |
3619 | suspend_state_t state, | |
3620 | int n_coupled) | |
3621 | { | |
3622 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3623 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3624 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3625 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3626 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3627 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3628 | int i, ret, max_spread; |
c054c6c7 MP |
3629 | bool done; |
3630 | ||
3631 | *current_uV = -1; | |
3632 | ||
3633 | /* | |
3634 | * If there are no coupled regulators, simply set the voltage | |
3635 | * demanded by consumers. | |
3636 | */ | |
3637 | if (n_coupled == 1) { | |
3638 | /* | |
3639 | * If consumers don't provide any demands, set voltage | |
3640 | * to min_uV | |
3641 | */ | |
3642 | desired_min_uV = constraints->min_uV; | |
3643 | desired_max_uV = constraints->max_uV; | |
3644 | ||
3645 | ret = regulator_check_consumers(rdev, | |
3646 | &desired_min_uV, | |
3647 | &desired_max_uV, state); | |
3648 | if (ret < 0) | |
3649 | return ret; | |
3650 | ||
3651 | possible_uV = desired_min_uV; | |
3652 | done = true; | |
3653 | ||
3654 | goto finish; | |
3655 | } | |
3656 | ||
3657 | /* Find highest min desired voltage */ | |
3658 | for (i = 0; i < n_coupled; i++) { | |
3659 | int tmp_min = 0; | |
3660 | int tmp_max = INT_MAX; | |
3661 | ||
f8702f9e | 3662 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3663 | |
3664 | ret = regulator_check_consumers(c_rdevs[i], | |
3665 | &tmp_min, | |
3666 | &tmp_max, state); | |
3667 | if (ret < 0) | |
3668 | return ret; | |
3669 | ||
3670 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3671 | if (ret < 0) | |
3672 | return ret; | |
69686176 | 3673 | |
c054c6c7 MP |
3674 | highest_min_uV = max(highest_min_uV, tmp_min); |
3675 | ||
3676 | if (i == 0) { | |
3677 | desired_min_uV = tmp_min; | |
3678 | desired_max_uV = tmp_max; | |
3679 | } | |
3680 | } | |
3681 | ||
d8ca7d18 DO |
3682 | max_spread = constraints->max_spread[0]; |
3683 | ||
c054c6c7 MP |
3684 | /* |
3685 | * Let target_uV be equal to the desired one if possible. | |
3686 | * If not, set it to minimum voltage, allowed by other coupled | |
3687 | * regulators. | |
3688 | */ | |
3689 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3690 | ||
3691 | /* | |
3692 | * Find min and max voltages, which currently aren't violating | |
3693 | * max_spread. | |
3694 | */ | |
3695 | for (i = 1; i < n_coupled; i++) { | |
3696 | int tmp_act; | |
3697 | ||
3698 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3699 | continue; | |
3700 | ||
d22b85a1 | 3701 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3702 | if (tmp_act < 0) |
3703 | return tmp_act; | |
3704 | ||
3705 | min_current_uV = min(tmp_act, min_current_uV); | |
3706 | max_current_uV = max(tmp_act, max_current_uV); | |
3707 | } | |
3708 | ||
3709 | /* There aren't any other regulators enabled */ | |
3710 | if (max_current_uV == 0) { | |
3711 | possible_uV = target_uV; | |
3712 | } else { | |
3713 | /* | |
3714 | * Correct target voltage, so as it currently isn't | |
3715 | * violating max_spread | |
3716 | */ | |
3717 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3718 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3719 | } | |
3720 | ||
3721 | if (possible_uV > desired_max_uV) | |
3722 | return -EINVAL; | |
3723 | ||
3724 | done = (possible_uV == target_uV); | |
3725 | desired_min_uV = possible_uV; | |
3726 | ||
3727 | finish: | |
85254bcf DO |
3728 | /* Apply max_uV_step constraint if necessary */ |
3729 | if (state == PM_SUSPEND_ON) { | |
3730 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3731 | &desired_min_uV); | |
3732 | if (ret < 0) | |
3733 | return ret; | |
3734 | ||
3735 | if (ret == 0) | |
3736 | done = false; | |
3737 | } | |
3738 | ||
c054c6c7 MP |
3739 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3740 | if (n_coupled > 1 && *current_uV == -1) { | |
3741 | ||
3742 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3743 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3744 | if (ret < 0) |
3745 | return ret; | |
3746 | ||
3747 | *current_uV = ret; | |
3748 | } else { | |
3749 | *current_uV = desired_min_uV; | |
3750 | } | |
3751 | } | |
3752 | ||
3753 | *min_uV = desired_min_uV; | |
3754 | *max_uV = desired_max_uV; | |
3755 | ||
3756 | return done; | |
3757 | } | |
3758 | ||
752db83a MS |
3759 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3760 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3761 | { |
3762 | struct regulator_dev **c_rdevs; | |
3763 | struct regulator_dev *best_rdev; | |
3764 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3765 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3766 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3767 | unsigned long c_rdev_done = 0; |
3768 | bool best_c_rdev_done; | |
c054c6c7 MP |
3769 | |
3770 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3771 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3772 | |
3773 | /* | |
3774 | * Find the best possible voltage change on each loop. Leave the loop | |
3775 | * if there isn't any possible change. | |
3776 | */ | |
3777 | do { | |
3778 | best_c_rdev_done = false; | |
3779 | best_delta = 0; | |
3780 | best_min_uV = 0; | |
3781 | best_max_uV = 0; | |
3782 | best_c_rdev = 0; | |
3783 | best_rdev = NULL; | |
3784 | ||
3785 | /* | |
3786 | * Find highest difference between optimal voltage | |
3787 | * and current voltage. | |
3788 | */ | |
3789 | for (i = 0; i < n_coupled; i++) { | |
3790 | /* | |
3791 | * optimal_uV is the best voltage that can be set for | |
3792 | * i-th regulator at the moment without violating | |
3793 | * max_spread constraint in order to balance | |
3794 | * the coupled voltages. | |
3795 | */ | |
3796 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3797 | ||
d8ca7d18 | 3798 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
3799 | continue; |
3800 | ||
3801 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3802 | ¤t_uV, | |
3803 | &optimal_uV, | |
3804 | &optimal_max_uV, | |
3805 | state, n_coupled); | |
3806 | if (ret < 0) | |
3807 | goto out; | |
3808 | ||
3809 | delta = abs(optimal_uV - current_uV); | |
3810 | ||
3811 | if (delta && best_delta <= delta) { | |
3812 | best_c_rdev_done = ret; | |
3813 | best_delta = delta; | |
3814 | best_rdev = c_rdevs[i]; | |
3815 | best_min_uV = optimal_uV; | |
3816 | best_max_uV = optimal_max_uV; | |
3817 | best_c_rdev = i; | |
3818 | } | |
3819 | } | |
3820 | ||
3821 | /* Nothing to change, return successfully */ | |
3822 | if (!best_rdev) { | |
3823 | ret = 0; | |
3824 | goto out; | |
3825 | } | |
9243a195 | 3826 | |
c054c6c7 MP |
3827 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3828 | best_max_uV, state); | |
9243a195 | 3829 | |
c054c6c7 MP |
3830 | if (ret < 0) |
3831 | goto out; | |
3832 | ||
d8ca7d18 DO |
3833 | if (best_c_rdev_done) |
3834 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
3835 | |
3836 | } while (n_coupled > 1); | |
3837 | ||
3838 | out: | |
69686176 MP |
3839 | return ret; |
3840 | } | |
3841 | ||
752db83a MS |
3842 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
3843 | suspend_state_t state) | |
3844 | { | |
3845 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3846 | struct regulator_coupler *coupler = c_desc->coupler; | |
3847 | bool skip_coupled = false; | |
3848 | ||
3849 | /* | |
3850 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3851 | * other coupled regulators. | |
3852 | */ | |
3853 | if (state != PM_SUSPEND_ON) | |
3854 | skip_coupled = true; | |
3855 | ||
3856 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
3857 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3858 | return -EPERM; | |
3859 | } | |
3860 | ||
3861 | /* Invoke custom balancer for customized couplers */ | |
3862 | if (coupler && coupler->balance_voltage) | |
3863 | return coupler->balance_voltage(coupler, rdev, state); | |
3864 | ||
3865 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
3866 | } | |
3867 | ||
a9f226bc SH |
3868 | /** |
3869 | * regulator_set_voltage - set regulator output voltage | |
3870 | * @regulator: regulator source | |
3871 | * @min_uV: Minimum required voltage in uV | |
3872 | * @max_uV: Maximum acceptable voltage in uV | |
3873 | * | |
3874 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3875 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3876 | * | |
3877 | * If the regulator is enabled then the voltage will change to the new value | |
3878 | * immediately otherwise if the regulator is disabled the regulator will | |
3879 | * output at the new voltage when enabled. | |
3880 | * | |
3881 | * NOTE: If the regulator is shared between several devices then the lowest | |
3882 | * request voltage that meets the system constraints will be used. | |
3883 | * Regulator system constraints must be set for this regulator before | |
3884 | * calling this function otherwise this call will fail. | |
3885 | */ | |
3886 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3887 | { | |
f8702f9e DO |
3888 | struct ww_acquire_ctx ww_ctx; |
3889 | int ret; | |
a9f226bc | 3890 | |
f8702f9e | 3891 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3892 | |
c360a6df CZ |
3893 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3894 | PM_SUSPEND_ON); | |
a9f226bc | 3895 | |
f8702f9e | 3896 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3897 | |
414c70cb LG |
3898 | return ret; |
3899 | } | |
3900 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3901 | ||
f7efad10 CZ |
3902 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3903 | suspend_state_t state, bool en) | |
3904 | { | |
3905 | struct regulator_state *rstate; | |
3906 | ||
3907 | rstate = regulator_get_suspend_state(rdev, state); | |
3908 | if (rstate == NULL) | |
3909 | return -EINVAL; | |
3910 | ||
3911 | if (!rstate->changeable) | |
3912 | return -EPERM; | |
3913 | ||
3edd79cf | 3914 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3915 | |
3916 | return 0; | |
3917 | } | |
3918 | ||
3919 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3920 | suspend_state_t state) | |
3921 | { | |
3922 | return regulator_suspend_toggle(rdev, state, true); | |
3923 | } | |
3924 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3925 | ||
3926 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3927 | suspend_state_t state) | |
3928 | { | |
3929 | struct regulator *regulator; | |
3930 | struct regulator_voltage *voltage; | |
3931 | ||
3932 | /* | |
3933 | * if any consumer wants this regulator device keeping on in | |
3934 | * suspend states, don't set it as disabled. | |
3935 | */ | |
3936 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3937 | voltage = ®ulator->voltage[state]; | |
3938 | if (voltage->min_uV || voltage->max_uV) | |
3939 | return 0; | |
3940 | } | |
3941 | ||
3942 | return regulator_suspend_toggle(rdev, state, false); | |
3943 | } | |
3944 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3945 | ||
3946 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3947 | int min_uV, int max_uV, | |
3948 | suspend_state_t state) | |
3949 | { | |
3950 | struct regulator_dev *rdev = regulator->rdev; | |
3951 | struct regulator_state *rstate; | |
3952 | ||
3953 | rstate = regulator_get_suspend_state(rdev, state); | |
3954 | if (rstate == NULL) | |
3955 | return -EINVAL; | |
3956 | ||
3957 | if (rstate->min_uV == rstate->max_uV) { | |
3958 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3959 | return -EPERM; | |
3960 | } | |
3961 | ||
3962 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3963 | } | |
3964 | ||
3965 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3966 | int max_uV, suspend_state_t state) | |
3967 | { | |
f8702f9e DO |
3968 | struct ww_acquire_ctx ww_ctx; |
3969 | int ret; | |
f7efad10 CZ |
3970 | |
3971 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3972 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3973 | return -EINVAL; | |
3974 | ||
f8702f9e | 3975 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3976 | |
3977 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3978 | max_uV, state); | |
3979 | ||
f8702f9e | 3980 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3981 | |
3982 | return ret; | |
3983 | } | |
3984 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3985 | ||
88cd222b LW |
3986 | /** |
3987 | * regulator_set_voltage_time - get raise/fall time | |
3988 | * @regulator: regulator source | |
3989 | * @old_uV: starting voltage in microvolts | |
3990 | * @new_uV: target voltage in microvolts | |
3991 | * | |
3992 | * Provided with the starting and ending voltage, this function attempts to | |
3993 | * calculate the time in microseconds required to rise or fall to this new | |
3994 | * voltage. | |
3995 | */ | |
3996 | int regulator_set_voltage_time(struct regulator *regulator, | |
3997 | int old_uV, int new_uV) | |
3998 | { | |
272e2315 GX |
3999 | struct regulator_dev *rdev = regulator->rdev; |
4000 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
4001 | int old_sel = -1; |
4002 | int new_sel = -1; | |
4003 | int voltage; | |
4004 | int i; | |
4005 | ||
73e705bf MK |
4006 | if (ops->set_voltage_time) |
4007 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
4008 | else if (!ops->set_voltage_time_sel) | |
4009 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
4010 | ||
88cd222b | 4011 | /* Currently requires operations to do this */ |
73e705bf | 4012 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
4013 | return -EINVAL; |
4014 | ||
4015 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
4016 | /* We only look for exact voltage matches here */ | |
4017 | voltage = regulator_list_voltage(regulator, i); | |
4018 | if (voltage < 0) | |
4019 | return -EINVAL; | |
4020 | if (voltage == 0) | |
4021 | continue; | |
4022 | if (voltage == old_uV) | |
4023 | old_sel = i; | |
4024 | if (voltage == new_uV) | |
4025 | new_sel = i; | |
4026 | } | |
4027 | ||
4028 | if (old_sel < 0 || new_sel < 0) | |
4029 | return -EINVAL; | |
4030 | ||
4031 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
4032 | } | |
4033 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
4034 | ||
98a175b6 | 4035 | /** |
296c6566 RD |
4036 | * regulator_set_voltage_time_sel - get raise/fall time |
4037 | * @rdev: regulator source device | |
98a175b6 YSB |
4038 | * @old_selector: selector for starting voltage |
4039 | * @new_selector: selector for target voltage | |
4040 | * | |
4041 | * Provided with the starting and target voltage selectors, this function | |
4042 | * returns time in microseconds required to rise or fall to this new voltage | |
4043 | * | |
f11d08c3 | 4044 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4045 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4046 | */ |
4047 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4048 | unsigned int old_selector, | |
4049 | unsigned int new_selector) | |
4050 | { | |
f11d08c3 | 4051 | int old_volt, new_volt; |
398715ab | 4052 | |
f11d08c3 AL |
4053 | /* sanity check */ |
4054 | if (!rdev->desc->ops->list_voltage) | |
4055 | return -EINVAL; | |
398715ab | 4056 | |
f11d08c3 AL |
4057 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4058 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4059 | ||
73e705bf MK |
4060 | if (rdev->desc->ops->set_voltage_time) |
4061 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4062 | new_volt); | |
4063 | else | |
4064 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4065 | } |
b19dbf71 | 4066 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4067 | |
606a2562 MB |
4068 | /** |
4069 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4070 | * @regulator: regulator source | |
4071 | * | |
4072 | * Re-apply the last configured voltage. This is intended to be used | |
4073 | * where some external control source the consumer is cooperating with | |
4074 | * has caused the configured voltage to change. | |
4075 | */ | |
4076 | int regulator_sync_voltage(struct regulator *regulator) | |
4077 | { | |
4078 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4079 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4080 | int ret, min_uV, max_uV; |
4081 | ||
66cf9a7e | 4082 | regulator_lock(rdev); |
606a2562 MB |
4083 | |
4084 | if (!rdev->desc->ops->set_voltage && | |
4085 | !rdev->desc->ops->set_voltage_sel) { | |
4086 | ret = -EINVAL; | |
4087 | goto out; | |
4088 | } | |
4089 | ||
4090 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4091 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4092 | ret = -EINVAL; |
4093 | goto out; | |
4094 | } | |
4095 | ||
c360a6df CZ |
4096 | min_uV = voltage->min_uV; |
4097 | max_uV = voltage->max_uV; | |
606a2562 MB |
4098 | |
4099 | /* This should be a paranoia check... */ | |
4100 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4101 | if (ret < 0) | |
4102 | goto out; | |
4103 | ||
c360a6df | 4104 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4105 | if (ret < 0) |
4106 | goto out; | |
4107 | ||
4108 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
4109 | ||
4110 | out: | |
66cf9a7e | 4111 | regulator_unlock(rdev); |
606a2562 MB |
4112 | return ret; |
4113 | } | |
4114 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4115 | ||
d22b85a1 | 4116 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4117 | { |
bf5892a8 | 4118 | int sel, ret; |
fef95019 MB |
4119 | bool bypassed; |
4120 | ||
4121 | if (rdev->desc->ops->get_bypass) { | |
4122 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4123 | if (ret < 0) | |
4124 | return ret; | |
4125 | if (bypassed) { | |
4126 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4127 | if (!rdev->supply) { |
4128 | rdev_err(rdev, | |
4129 | "bypassed regulator has no supply!\n"); | |
4130 | return -EPROBE_DEFER; | |
4131 | } | |
fef95019 | 4132 | |
d22b85a1 | 4133 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4134 | } |
4135 | } | |
476c2d83 MB |
4136 | |
4137 | if (rdev->desc->ops->get_voltage_sel) { | |
4138 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4139 | if (sel < 0) | |
4140 | return sel; | |
bf5892a8 | 4141 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4142 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4143 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4144 | } else if (rdev->desc->ops->list_voltage) { |
4145 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4146 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4147 | ret = rdev->desc->fixed_uV; | |
e303996e | 4148 | } else if (rdev->supply) { |
d22b85a1 | 4149 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cb220d16 | 4150 | } else { |
414c70cb | 4151 | return -EINVAL; |
cb220d16 | 4152 | } |
bf5892a8 | 4153 | |
cb220d16 AL |
4154 | if (ret < 0) |
4155 | return ret; | |
bf5892a8 | 4156 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4157 | } |
3d7610e8 | 4158 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4159 | |
4160 | /** | |
4161 | * regulator_get_voltage - get regulator output voltage | |
4162 | * @regulator: regulator source | |
4163 | * | |
4164 | * This returns the current regulator voltage in uV. | |
4165 | * | |
4166 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4167 | * function should not be used to determine regulator state. | |
4168 | */ | |
4169 | int regulator_get_voltage(struct regulator *regulator) | |
4170 | { | |
f8702f9e | 4171 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4172 | int ret; |
4173 | ||
f8702f9e | 4174 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4175 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4176 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4177 | |
4178 | return ret; | |
4179 | } | |
4180 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4181 | ||
4182 | /** | |
4183 | * regulator_set_current_limit - set regulator output current limit | |
4184 | * @regulator: regulator source | |
ce0d10f8 | 4185 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4186 | * @max_uA: Maximum supported current in uA |
4187 | * | |
4188 | * Sets current sink to the desired output current. This can be set during | |
4189 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4190 | * | |
4191 | * If the regulator is enabled then the current will change to the new value | |
4192 | * immediately otherwise if the regulator is disabled the regulator will | |
4193 | * output at the new current when enabled. | |
4194 | * | |
4195 | * NOTE: Regulator system constraints must be set for this regulator before | |
4196 | * calling this function otherwise this call will fail. | |
4197 | */ | |
4198 | int regulator_set_current_limit(struct regulator *regulator, | |
4199 | int min_uA, int max_uA) | |
4200 | { | |
4201 | struct regulator_dev *rdev = regulator->rdev; | |
4202 | int ret; | |
4203 | ||
66cf9a7e | 4204 | regulator_lock(rdev); |
414c70cb LG |
4205 | |
4206 | /* sanity check */ | |
4207 | if (!rdev->desc->ops->set_current_limit) { | |
4208 | ret = -EINVAL; | |
4209 | goto out; | |
4210 | } | |
4211 | ||
4212 | /* constraints check */ | |
4213 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4214 | if (ret < 0) | |
4215 | goto out; | |
4216 | ||
4217 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4218 | out: | |
66cf9a7e | 4219 | regulator_unlock(rdev); |
414c70cb LG |
4220 | return ret; |
4221 | } | |
4222 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4223 | ||
7e4d9683 DA |
4224 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4225 | { | |
4226 | /* sanity check */ | |
4227 | if (!rdev->desc->ops->get_current_limit) | |
4228 | return -EINVAL; | |
4229 | ||
4230 | return rdev->desc->ops->get_current_limit(rdev); | |
4231 | } | |
4232 | ||
414c70cb LG |
4233 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4234 | { | |
4235 | int ret; | |
4236 | ||
66cf9a7e | 4237 | regulator_lock(rdev); |
7e4d9683 | 4238 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4239 | regulator_unlock(rdev); |
7e4d9683 | 4240 | |
414c70cb LG |
4241 | return ret; |
4242 | } | |
4243 | ||
4244 | /** | |
4245 | * regulator_get_current_limit - get regulator output current | |
4246 | * @regulator: regulator source | |
4247 | * | |
4248 | * This returns the current supplied by the specified current sink in uA. | |
4249 | * | |
4250 | * NOTE: If the regulator is disabled it will return the current value. This | |
4251 | * function should not be used to determine regulator state. | |
4252 | */ | |
4253 | int regulator_get_current_limit(struct regulator *regulator) | |
4254 | { | |
4255 | return _regulator_get_current_limit(regulator->rdev); | |
4256 | } | |
4257 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4258 | ||
4259 | /** | |
4260 | * regulator_set_mode - set regulator operating mode | |
4261 | * @regulator: regulator source | |
4262 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4263 | * | |
4264 | * Set regulator operating mode to increase regulator efficiency or improve | |
4265 | * regulation performance. | |
4266 | * | |
4267 | * NOTE: Regulator system constraints must be set for this regulator before | |
4268 | * calling this function otherwise this call will fail. | |
4269 | */ | |
4270 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4271 | { | |
4272 | struct regulator_dev *rdev = regulator->rdev; | |
4273 | int ret; | |
500b4ac9 | 4274 | int regulator_curr_mode; |
414c70cb | 4275 | |
66cf9a7e | 4276 | regulator_lock(rdev); |
414c70cb LG |
4277 | |
4278 | /* sanity check */ | |
4279 | if (!rdev->desc->ops->set_mode) { | |
4280 | ret = -EINVAL; | |
4281 | goto out; | |
4282 | } | |
4283 | ||
500b4ac9 SI |
4284 | /* return if the same mode is requested */ |
4285 | if (rdev->desc->ops->get_mode) { | |
4286 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4287 | if (regulator_curr_mode == mode) { | |
4288 | ret = 0; | |
4289 | goto out; | |
4290 | } | |
4291 | } | |
4292 | ||
414c70cb | 4293 | /* constraints check */ |
22c51b47 | 4294 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4295 | if (ret < 0) |
4296 | goto out; | |
4297 | ||
4298 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4299 | out: | |
66cf9a7e | 4300 | regulator_unlock(rdev); |
414c70cb LG |
4301 | return ret; |
4302 | } | |
4303 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4304 | ||
7e4d9683 DA |
4305 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4306 | { | |
4307 | /* sanity check */ | |
4308 | if (!rdev->desc->ops->get_mode) | |
4309 | return -EINVAL; | |
4310 | ||
4311 | return rdev->desc->ops->get_mode(rdev); | |
4312 | } | |
4313 | ||
414c70cb LG |
4314 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4315 | { | |
4316 | int ret; | |
4317 | ||
66cf9a7e | 4318 | regulator_lock(rdev); |
7e4d9683 | 4319 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4320 | regulator_unlock(rdev); |
7e4d9683 | 4321 | |
414c70cb LG |
4322 | return ret; |
4323 | } | |
4324 | ||
4325 | /** | |
4326 | * regulator_get_mode - get regulator operating mode | |
4327 | * @regulator: regulator source | |
4328 | * | |
4329 | * Get the current regulator operating mode. | |
4330 | */ | |
4331 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4332 | { | |
4333 | return _regulator_get_mode(regulator->rdev); | |
4334 | } | |
4335 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4336 | ||
1b5b4221 AH |
4337 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4338 | unsigned int *flags) | |
4339 | { | |
4340 | int ret; | |
4341 | ||
66cf9a7e | 4342 | regulator_lock(rdev); |
1b5b4221 AH |
4343 | |
4344 | /* sanity check */ | |
4345 | if (!rdev->desc->ops->get_error_flags) { | |
4346 | ret = -EINVAL; | |
4347 | goto out; | |
4348 | } | |
4349 | ||
4350 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4351 | out: | |
66cf9a7e | 4352 | regulator_unlock(rdev); |
1b5b4221 AH |
4353 | return ret; |
4354 | } | |
4355 | ||
4356 | /** | |
4357 | * regulator_get_error_flags - get regulator error information | |
4358 | * @regulator: regulator source | |
4359 | * @flags: pointer to store error flags | |
4360 | * | |
4361 | * Get the current regulator error information. | |
4362 | */ | |
4363 | int regulator_get_error_flags(struct regulator *regulator, | |
4364 | unsigned int *flags) | |
4365 | { | |
4366 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4367 | } | |
4368 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4369 | ||
414c70cb | 4370 | /** |
e39ce48f | 4371 | * regulator_set_load - set regulator load |
414c70cb LG |
4372 | * @regulator: regulator source |
4373 | * @uA_load: load current | |
4374 | * | |
4375 | * Notifies the regulator core of a new device load. This is then used by | |
4376 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4377 | * operating mode for the new regulator loading. | |
4378 | * | |
4379 | * Consumer devices notify their supply regulator of the maximum power | |
4380 | * they will require (can be taken from device datasheet in the power | |
4381 | * consumption tables) when they change operational status and hence power | |
4382 | * state. Examples of operational state changes that can affect power | |
4383 | * consumption are :- | |
4384 | * | |
4385 | * o Device is opened / closed. | |
4386 | * o Device I/O is about to begin or has just finished. | |
4387 | * o Device is idling in between work. | |
4388 | * | |
4389 | * This information is also exported via sysfs to userspace. | |
4390 | * | |
4391 | * DRMS will sum the total requested load on the regulator and change | |
4392 | * to the most efficient operating mode if platform constraints allow. | |
4393 | * | |
5451781d DA |
4394 | * NOTE: when a regulator consumer requests to have a regulator |
4395 | * disabled then any load that consumer requested no longer counts | |
4396 | * toward the total requested load. If the regulator is re-enabled | |
4397 | * then the previously requested load will start counting again. | |
4398 | * | |
4399 | * If a regulator is an always-on regulator then an individual consumer's | |
4400 | * load will still be removed if that consumer is fully disabled. | |
4401 | * | |
e39ce48f | 4402 | * On error a negative errno is returned. |
414c70cb | 4403 | */ |
e39ce48f | 4404 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4405 | { |
4406 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4407 | int old_uA_load; |
4408 | int ret = 0; | |
d92d95b6 | 4409 | |
66cf9a7e | 4410 | regulator_lock(rdev); |
5451781d | 4411 | old_uA_load = regulator->uA_load; |
414c70cb | 4412 | regulator->uA_load = uA_load; |
5451781d DA |
4413 | if (regulator->enable_count && old_uA_load != uA_load) { |
4414 | ret = drms_uA_update(rdev); | |
4415 | if (ret < 0) | |
4416 | regulator->uA_load = old_uA_load; | |
4417 | } | |
66cf9a7e | 4418 | regulator_unlock(rdev); |
8460ef38 | 4419 | |
414c70cb LG |
4420 | return ret; |
4421 | } | |
e39ce48f | 4422 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4423 | |
f59c8f9f MB |
4424 | /** |
4425 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4426 | * | |
4427 | * @regulator: Regulator to configure | |
9345dfb8 | 4428 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4429 | * |
4430 | * Allow the regulator to go into bypass mode if all other consumers | |
4431 | * for the regulator also enable bypass mode and the machine | |
4432 | * constraints allow this. Bypass mode means that the regulator is | |
4433 | * simply passing the input directly to the output with no regulation. | |
4434 | */ | |
4435 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4436 | { | |
4437 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4438 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4439 | int ret = 0; |
4440 | ||
4441 | if (!rdev->desc->ops->set_bypass) | |
4442 | return 0; | |
4443 | ||
8a34e979 | 4444 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4445 | return 0; |
4446 | ||
66cf9a7e | 4447 | regulator_lock(rdev); |
f59c8f9f MB |
4448 | |
4449 | if (enable && !regulator->bypass) { | |
4450 | rdev->bypass_count++; | |
4451 | ||
4452 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4453 | trace_regulator_bypass_enable(name); |
4454 | ||
f59c8f9f MB |
4455 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4456 | if (ret != 0) | |
4457 | rdev->bypass_count--; | |
48325655 CK |
4458 | else |
4459 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4460 | } |
4461 | ||
4462 | } else if (!enable && regulator->bypass) { | |
4463 | rdev->bypass_count--; | |
4464 | ||
4465 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4466 | trace_regulator_bypass_disable(name); |
4467 | ||
f59c8f9f MB |
4468 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4469 | if (ret != 0) | |
4470 | rdev->bypass_count++; | |
48325655 CK |
4471 | else |
4472 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4473 | } |
4474 | } | |
4475 | ||
4476 | if (ret == 0) | |
4477 | regulator->bypass = enable; | |
4478 | ||
66cf9a7e | 4479 | regulator_unlock(rdev); |
f59c8f9f MB |
4480 | |
4481 | return ret; | |
4482 | } | |
4483 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4484 | ||
414c70cb LG |
4485 | /** |
4486 | * regulator_register_notifier - register regulator event notifier | |
4487 | * @regulator: regulator source | |
69279fb9 | 4488 | * @nb: notifier block |
414c70cb LG |
4489 | * |
4490 | * Register notifier block to receive regulator events. | |
4491 | */ | |
4492 | int regulator_register_notifier(struct regulator *regulator, | |
4493 | struct notifier_block *nb) | |
4494 | { | |
4495 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4496 | nb); | |
4497 | } | |
4498 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4499 | ||
4500 | /** | |
4501 | * regulator_unregister_notifier - unregister regulator event notifier | |
4502 | * @regulator: regulator source | |
69279fb9 | 4503 | * @nb: notifier block |
414c70cb LG |
4504 | * |
4505 | * Unregister regulator event notifier block. | |
4506 | */ | |
4507 | int regulator_unregister_notifier(struct regulator *regulator, | |
4508 | struct notifier_block *nb) | |
4509 | { | |
4510 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4511 | nb); | |
4512 | } | |
4513 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4514 | ||
b136fb44 JC |
4515 | /* notify regulator consumers and downstream regulator consumers. |
4516 | * Note mutex must be held by caller. | |
4517 | */ | |
7179569a | 4518 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4519 | unsigned long event, void *data) |
4520 | { | |
414c70cb | 4521 | /* call rdev chain first */ |
7179569a | 4522 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4523 | } |
4524 | ||
4525 | /** | |
4526 | * regulator_bulk_get - get multiple regulator consumers | |
4527 | * | |
4528 | * @dev: Device to supply | |
4529 | * @num_consumers: Number of consumers to register | |
4530 | * @consumers: Configuration of consumers; clients are stored here. | |
4531 | * | |
4532 | * @return 0 on success, an errno on failure. | |
4533 | * | |
4534 | * This helper function allows drivers to get several regulator | |
4535 | * consumers in one operation. If any of the regulators cannot be | |
4536 | * acquired then any regulators that were allocated will be freed | |
4537 | * before returning to the caller. | |
4538 | */ | |
4539 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4540 | struct regulator_bulk_data *consumers) | |
4541 | { | |
4542 | int i; | |
4543 | int ret; | |
4544 | ||
4545 | for (i = 0; i < num_consumers; i++) | |
4546 | consumers[i].consumer = NULL; | |
4547 | ||
4548 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4549 | consumers[i].consumer = regulator_get(dev, |
4550 | consumers[i].supply); | |
414c70cb | 4551 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb LG |
4552 | ret = PTR_ERR(consumers[i].consumer); |
4553 | consumers[i].consumer = NULL; | |
4554 | goto err; | |
4555 | } | |
4556 | } | |
4557 | ||
4558 | return 0; | |
4559 | ||
4560 | err: | |
b9816363 JRO |
4561 | if (ret != -EPROBE_DEFER) |
4562 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
4563 | consumers[i].supply, ret); | |
4564 | else | |
4565 | dev_dbg(dev, "Failed to get supply '%s', deferring\n", | |
4566 | consumers[i].supply); | |
4567 | ||
b29c7690 | 4568 | while (--i >= 0) |
414c70cb LG |
4569 | regulator_put(consumers[i].consumer); |
4570 | ||
4571 | return ret; | |
4572 | } | |
4573 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4574 | ||
f21e0e81 MB |
4575 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4576 | { | |
4577 | struct regulator_bulk_data *bulk = data; | |
4578 | ||
4579 | bulk->ret = regulator_enable(bulk->consumer); | |
4580 | } | |
4581 | ||
414c70cb LG |
4582 | /** |
4583 | * regulator_bulk_enable - enable multiple regulator consumers | |
4584 | * | |
4585 | * @num_consumers: Number of consumers | |
4586 | * @consumers: Consumer data; clients are stored here. | |
4587 | * @return 0 on success, an errno on failure | |
4588 | * | |
4589 | * This convenience API allows consumers to enable multiple regulator | |
4590 | * clients in a single API call. If any consumers cannot be enabled | |
4591 | * then any others that were enabled will be disabled again prior to | |
4592 | * return. | |
4593 | */ | |
4594 | int regulator_bulk_enable(int num_consumers, | |
4595 | struct regulator_bulk_data *consumers) | |
4596 | { | |
2955b47d | 4597 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4598 | int i; |
f21e0e81 | 4599 | int ret = 0; |
414c70cb | 4600 | |
6492bc1b | 4601 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4602 | async_schedule_domain(regulator_bulk_enable_async, |
4603 | &consumers[i], &async_domain); | |
6492bc1b | 4604 | } |
f21e0e81 MB |
4605 | |
4606 | async_synchronize_full_domain(&async_domain); | |
4607 | ||
4608 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4609 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4610 | if (consumers[i].ret != 0) { |
4611 | ret = consumers[i].ret; | |
414c70cb | 4612 | goto err; |
f21e0e81 | 4613 | } |
414c70cb LG |
4614 | } |
4615 | ||
4616 | return 0; | |
4617 | ||
4618 | err: | |
fbe31057 AH |
4619 | for (i = 0; i < num_consumers; i++) { |
4620 | if (consumers[i].ret < 0) | |
4621 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
4622 | consumers[i].ret); | |
4623 | else | |
4624 | regulator_disable(consumers[i].consumer); | |
4625 | } | |
414c70cb LG |
4626 | |
4627 | return ret; | |
4628 | } | |
4629 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4630 | ||
4631 | /** | |
4632 | * regulator_bulk_disable - disable multiple regulator consumers | |
4633 | * | |
4634 | * @num_consumers: Number of consumers | |
4635 | * @consumers: Consumer data; clients are stored here. | |
4636 | * @return 0 on success, an errno on failure | |
4637 | * | |
4638 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4639 | * clients in a single API call. If any consumers cannot be disabled |
4640 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4641 | * return. |
4642 | */ | |
4643 | int regulator_bulk_disable(int num_consumers, | |
4644 | struct regulator_bulk_data *consumers) | |
4645 | { | |
4646 | int i; | |
01e86f49 | 4647 | int ret, r; |
414c70cb | 4648 | |
49e22632 | 4649 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4650 | ret = regulator_disable(consumers[i].consumer); |
4651 | if (ret != 0) | |
4652 | goto err; | |
4653 | } | |
4654 | ||
4655 | return 0; | |
4656 | ||
4657 | err: | |
5da84fd9 | 4658 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
4659 | for (++i; i < num_consumers; ++i) { |
4660 | r = regulator_enable(consumers[i].consumer); | |
4661 | if (r != 0) | |
d1642ea7 | 4662 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
4663 | consumers[i].supply, r); |
4664 | } | |
414c70cb LG |
4665 | |
4666 | return ret; | |
4667 | } | |
4668 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4669 | ||
e1de2f42 DK |
4670 | /** |
4671 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4672 | * | |
4673 | * @num_consumers: Number of consumers | |
4674 | * @consumers: Consumer data; clients are stored here. | |
4675 | * @return 0 on success, an errno on failure | |
4676 | * | |
4677 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4678 | * clients in a single API call. | |
4679 | * NOTE: This should be used for situations when device damage will | |
4680 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4681 | * Although regulator_force_disable function call for some consumers can | |
4682 | * return error numbers, the function is called for all consumers. | |
4683 | */ | |
4684 | int regulator_bulk_force_disable(int num_consumers, | |
4685 | struct regulator_bulk_data *consumers) | |
4686 | { | |
4687 | int i; | |
b8c77ff6 | 4688 | int ret = 0; |
e1de2f42 | 4689 | |
b8c77ff6 | 4690 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4691 | consumers[i].ret = |
4692 | regulator_force_disable(consumers[i].consumer); | |
4693 | ||
b8c77ff6 DT |
4694 | /* Store first error for reporting */ |
4695 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4696 | ret = consumers[i].ret; |
e1de2f42 DK |
4697 | } |
4698 | ||
e1de2f42 DK |
4699 | return ret; |
4700 | } | |
4701 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4702 | ||
414c70cb LG |
4703 | /** |
4704 | * regulator_bulk_free - free multiple regulator consumers | |
4705 | * | |
4706 | * @num_consumers: Number of consumers | |
4707 | * @consumers: Consumer data; clients are stored here. | |
4708 | * | |
4709 | * This convenience API allows consumers to free multiple regulator | |
4710 | * clients in a single API call. | |
4711 | */ | |
4712 | void regulator_bulk_free(int num_consumers, | |
4713 | struct regulator_bulk_data *consumers) | |
4714 | { | |
4715 | int i; | |
4716 | ||
4717 | for (i = 0; i < num_consumers; i++) { | |
4718 | regulator_put(consumers[i].consumer); | |
4719 | consumers[i].consumer = NULL; | |
4720 | } | |
4721 | } | |
4722 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4723 | ||
4724 | /** | |
4725 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4726 | * @rdev: regulator source |
414c70cb | 4727 | * @event: notifier block |
69279fb9 | 4728 | * @data: callback-specific data. |
414c70cb LG |
4729 | * |
4730 | * Called by regulator drivers to notify clients a regulator event has | |
3bca239d | 4731 | * occurred. |
414c70cb LG |
4732 | */ |
4733 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4734 | unsigned long event, void *data) | |
4735 | { | |
4736 | _notifier_call_chain(rdev, event, data); | |
4737 | return NOTIFY_DONE; | |
4738 | ||
4739 | } | |
4740 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4741 | ||
be721979 MB |
4742 | /** |
4743 | * regulator_mode_to_status - convert a regulator mode into a status | |
4744 | * | |
4745 | * @mode: Mode to convert | |
4746 | * | |
4747 | * Convert a regulator mode into a status. | |
4748 | */ | |
4749 | int regulator_mode_to_status(unsigned int mode) | |
4750 | { | |
4751 | switch (mode) { | |
4752 | case REGULATOR_MODE_FAST: | |
4753 | return REGULATOR_STATUS_FAST; | |
4754 | case REGULATOR_MODE_NORMAL: | |
4755 | return REGULATOR_STATUS_NORMAL; | |
4756 | case REGULATOR_MODE_IDLE: | |
4757 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4758 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4759 | return REGULATOR_STATUS_STANDBY; |
4760 | default: | |
1beaf762 | 4761 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4762 | } |
4763 | } | |
4764 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4765 | ||
39f802d6 TI |
4766 | static struct attribute *regulator_dev_attrs[] = { |
4767 | &dev_attr_name.attr, | |
4768 | &dev_attr_num_users.attr, | |
4769 | &dev_attr_type.attr, | |
4770 | &dev_attr_microvolts.attr, | |
4771 | &dev_attr_microamps.attr, | |
4772 | &dev_attr_opmode.attr, | |
4773 | &dev_attr_state.attr, | |
4774 | &dev_attr_status.attr, | |
4775 | &dev_attr_bypass.attr, | |
4776 | &dev_attr_requested_microamps.attr, | |
4777 | &dev_attr_min_microvolts.attr, | |
4778 | &dev_attr_max_microvolts.attr, | |
4779 | &dev_attr_min_microamps.attr, | |
4780 | &dev_attr_max_microamps.attr, | |
4781 | &dev_attr_suspend_standby_state.attr, | |
4782 | &dev_attr_suspend_mem_state.attr, | |
4783 | &dev_attr_suspend_disk_state.attr, | |
4784 | &dev_attr_suspend_standby_microvolts.attr, | |
4785 | &dev_attr_suspend_mem_microvolts.attr, | |
4786 | &dev_attr_suspend_disk_microvolts.attr, | |
4787 | &dev_attr_suspend_standby_mode.attr, | |
4788 | &dev_attr_suspend_mem_mode.attr, | |
4789 | &dev_attr_suspend_disk_mode.attr, | |
4790 | NULL | |
4791 | }; | |
4792 | ||
7ad68e2f DB |
4793 | /* |
4794 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4795 | * create attributes that can be meaningfully displayed. | |
4796 | */ | |
39f802d6 TI |
4797 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4798 | struct attribute *attr, int idx) | |
7ad68e2f | 4799 | { |
39f802d6 | 4800 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4801 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4802 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4803 | umode_t mode = attr->mode; |
4804 | ||
4805 | /* these three are always present */ | |
4806 | if (attr == &dev_attr_name.attr || | |
4807 | attr == &dev_attr_num_users.attr || | |
4808 | attr == &dev_attr_type.attr) | |
4809 | return mode; | |
7ad68e2f DB |
4810 | |
4811 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4812 | if (attr == &dev_attr_microvolts.attr) { |
4813 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4814 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4815 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4816 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4817 | return mode; | |
4818 | return 0; | |
f59c8f9f | 4819 | } |
7ad68e2f | 4820 | |
39f802d6 TI |
4821 | if (attr == &dev_attr_microamps.attr) |
4822 | return ops->get_current_limit ? mode : 0; | |
4823 | ||
4824 | if (attr == &dev_attr_opmode.attr) | |
4825 | return ops->get_mode ? mode : 0; | |
4826 | ||
4827 | if (attr == &dev_attr_state.attr) | |
4828 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4829 | ||
4830 | if (attr == &dev_attr_status.attr) | |
4831 | return ops->get_status ? mode : 0; | |
4832 | ||
4833 | if (attr == &dev_attr_bypass.attr) | |
4834 | return ops->get_bypass ? mode : 0; | |
4835 | ||
7ad68e2f | 4836 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4837 | if (attr == &dev_attr_min_microvolts.attr || |
4838 | attr == &dev_attr_max_microvolts.attr) | |
4839 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4840 | ||
4841 | if (attr == &dev_attr_min_microamps.attr || | |
4842 | attr == &dev_attr_max_microamps.attr) | |
4843 | return ops->set_current_limit ? mode : 0; | |
4844 | ||
4845 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4846 | attr == &dev_attr_suspend_mem_state.attr || | |
4847 | attr == &dev_attr_suspend_disk_state.attr) | |
4848 | return mode; | |
4849 | ||
4850 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4851 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4852 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4853 | return ops->set_suspend_voltage ? mode : 0; | |
4854 | ||
4855 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4856 | attr == &dev_attr_suspend_mem_mode.attr || | |
4857 | attr == &dev_attr_suspend_disk_mode.attr) | |
4858 | return ops->set_suspend_mode ? mode : 0; | |
4859 | ||
4860 | return mode; | |
4861 | } | |
4862 | ||
4863 | static const struct attribute_group regulator_dev_group = { | |
4864 | .attrs = regulator_dev_attrs, | |
4865 | .is_visible = regulator_attr_is_visible, | |
4866 | }; | |
4867 | ||
4868 | static const struct attribute_group *regulator_dev_groups[] = { | |
4869 | ®ulator_dev_group, | |
4870 | NULL | |
4871 | }; | |
7ad68e2f | 4872 | |
39f802d6 TI |
4873 | static void regulator_dev_release(struct device *dev) |
4874 | { | |
4875 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4876 | |
4877 | kfree(rdev->constraints); | |
4878 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4879 | kfree(rdev); |
7ad68e2f DB |
4880 | } |
4881 | ||
1130e5b3 MB |
4882 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4883 | { | |
a9eaa813 GR |
4884 | struct device *parent = rdev->dev.parent; |
4885 | const char *rname = rdev_get_name(rdev); | |
4886 | char name[NAME_MAX]; | |
4887 | ||
4888 | /* Avoid duplicate debugfs directory names */ | |
4889 | if (parent && rname == rdev->desc->name) { | |
4890 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4891 | rname); | |
4892 | rname = name; | |
4893 | } | |
4894 | ||
4895 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4896 | if (!rdev->debugfs) { |
1130e5b3 | 4897 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4898 | return; |
4899 | } | |
4900 | ||
4901 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4902 | &rdev->use_count); | |
4903 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4904 | &rdev->open_count); | |
f59c8f9f MB |
4905 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4906 | &rdev->bypass_count); | |
1130e5b3 MB |
4907 | } |
4908 | ||
5e3ca2b3 JMC |
4909 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4910 | { | |
7ddede6a JH |
4911 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4912 | ||
4913 | if (regulator_resolve_supply(rdev)) | |
4914 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4915 | ||
4916 | return 0; | |
5e3ca2b3 JMC |
4917 | } |
4918 | ||
d8ca7d18 DO |
4919 | int regulator_coupler_register(struct regulator_coupler *coupler) |
4920 | { | |
4921 | mutex_lock(®ulator_list_mutex); | |
4922 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
4923 | mutex_unlock(®ulator_list_mutex); | |
4924 | ||
4925 | return 0; | |
4926 | } | |
4927 | ||
4928 | static struct regulator_coupler * | |
4929 | regulator_find_coupler(struct regulator_dev *rdev) | |
4930 | { | |
4931 | struct regulator_coupler *coupler; | |
4932 | int err; | |
4933 | ||
4934 | /* | |
4935 | * Note that regulators are appended to the list and the generic | |
4936 | * coupler is registered first, hence it will be attached at last | |
4937 | * if nobody cared. | |
4938 | */ | |
4939 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
4940 | err = coupler->attach_regulator(coupler, rdev); | |
4941 | if (!err) { | |
4942 | if (!coupler->balance_voltage && | |
4943 | rdev->coupling_desc.n_coupled > 2) | |
4944 | goto err_unsupported; | |
4945 | ||
4946 | return coupler; | |
4947 | } | |
4948 | ||
4949 | if (err < 0) | |
4950 | return ERR_PTR(err); | |
4951 | ||
4952 | if (err == 1) | |
4953 | continue; | |
4954 | ||
4955 | break; | |
4956 | } | |
4957 | ||
4958 | return ERR_PTR(-EINVAL); | |
4959 | ||
4960 | err_unsupported: | |
4961 | if (coupler->detach_regulator) | |
4962 | coupler->detach_regulator(coupler, rdev); | |
4963 | ||
4964 | rdev_err(rdev, | |
4965 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
4966 | ||
4967 | return ERR_PTR(-EPERM); | |
4968 | } | |
4969 | ||
f9503385 | 4970 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 4971 | { |
d8ca7d18 | 4972 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
4973 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
4974 | int n_coupled = c_desc->n_coupled; | |
4975 | struct regulator_dev *c_rdev; | |
4976 | int i; | |
4977 | ||
4978 | for (i = 1; i < n_coupled; i++) { | |
4979 | /* already resolved */ | |
4980 | if (c_desc->coupled_rdevs[i]) | |
4981 | continue; | |
4982 | ||
4983 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
4984 | ||
f9503385 DO |
4985 | if (!c_rdev) |
4986 | continue; | |
d3d64537 | 4987 | |
d8ca7d18 DO |
4988 | if (c_rdev->coupling_desc.coupler != coupler) { |
4989 | rdev_err(rdev, "coupler mismatch with %s\n", | |
4990 | rdev_get_name(c_rdev)); | |
4991 | return; | |
4992 | } | |
4993 | ||
f9503385 | 4994 | regulator_lock(c_rdev); |
d3d64537 | 4995 | |
f9503385 DO |
4996 | c_desc->coupled_rdevs[i] = c_rdev; |
4997 | c_desc->n_resolved++; | |
d3d64537 | 4998 | |
f9503385 | 4999 | regulator_unlock(c_rdev); |
d3d64537 | 5000 | |
f9503385 DO |
5001 | regulator_resolve_coupling(c_rdev); |
5002 | } | |
d3d64537 MP |
5003 | } |
5004 | ||
6303f3e7 | 5005 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 5006 | { |
d8ca7d18 | 5007 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
5008 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
5009 | struct regulator_dev *__c_rdev, *c_rdev; | |
5010 | unsigned int __n_coupled, n_coupled; | |
5011 | int i, k; | |
d8ca7d18 | 5012 | int err; |
d3d64537 | 5013 | |
6303f3e7 | 5014 | n_coupled = c_desc->n_coupled; |
d3d64537 | 5015 | |
6303f3e7 DO |
5016 | for (i = 1; i < n_coupled; i++) { |
5017 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 5018 | |
6303f3e7 DO |
5019 | if (!c_rdev) |
5020 | continue; | |
5021 | ||
5022 | regulator_lock(c_rdev); | |
5023 | ||
5024 | __c_desc = &c_rdev->coupling_desc; | |
5025 | __n_coupled = __c_desc->n_coupled; | |
5026 | ||
5027 | for (k = 1; k < __n_coupled; k++) { | |
5028 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
5029 | ||
5030 | if (__c_rdev == rdev) { | |
5031 | __c_desc->coupled_rdevs[k] = NULL; | |
5032 | __c_desc->n_resolved--; | |
5033 | break; | |
5034 | } | |
5035 | } | |
5036 | ||
5037 | regulator_unlock(c_rdev); | |
5038 | ||
5039 | c_desc->coupled_rdevs[i] = NULL; | |
5040 | c_desc->n_resolved--; | |
5041 | } | |
d8ca7d18 DO |
5042 | |
5043 | if (coupler && coupler->detach_regulator) { | |
5044 | err = coupler->detach_regulator(coupler, rdev); | |
5045 | if (err) | |
5046 | rdev_err(rdev, "failed to detach from coupler: %d\n", | |
5047 | err); | |
5048 | } | |
5049 | ||
5050 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5051 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5052 | } |
5053 | ||
f9503385 | 5054 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5055 | { |
7d819664 | 5056 | struct regulator_dev **coupled; |
d8ca7d18 | 5057 | int err, n_phandles; |
d3d64537 MP |
5058 | |
5059 | if (!IS_ENABLED(CONFIG_OF)) | |
5060 | n_phandles = 0; | |
5061 | else | |
5062 | n_phandles = of_get_n_coupled(rdev); | |
5063 | ||
7d819664 MM |
5064 | coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL); |
5065 | if (!coupled) | |
d8ca7d18 | 5066 | return -ENOMEM; |
d3d64537 | 5067 | |
7d819664 MM |
5068 | rdev->coupling_desc.coupled_rdevs = coupled; |
5069 | ||
d3d64537 MP |
5070 | /* |
5071 | * Every regulator should always have coupling descriptor filled with | |
5072 | * at least pointer to itself. | |
5073 | */ | |
5074 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5075 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5076 | rdev->coupling_desc.n_resolved++; | |
5077 | ||
5078 | /* regulator isn't coupled */ | |
5079 | if (n_phandles == 0) | |
5080 | return 0; | |
5081 | ||
d8ca7d18 | 5082 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5083 | return -EPERM; |
d3d64537 | 5084 | |
73a32129 | 5085 | mutex_lock(®ulator_list_mutex); |
d8ca7d18 | 5086 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
73a32129 MM |
5087 | mutex_unlock(®ulator_list_mutex); |
5088 | ||
d8ca7d18 DO |
5089 | if (IS_ERR(rdev->coupling_desc.coupler)) { |
5090 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
5091 | rdev_err(rdev, "failed to get coupler: %d\n", err); | |
5092 | return err; | |
d3d64537 MP |
5093 | } |
5094 | ||
d8ca7d18 DO |
5095 | return 0; |
5096 | } | |
5097 | ||
5098 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5099 | struct regulator_dev *rdev) | |
5100 | { | |
5101 | if (rdev->coupling_desc.n_coupled > 2) { | |
5102 | rdev_err(rdev, | |
5103 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5104 | return -EPERM; |
d8ca7d18 | 5105 | } |
d3d64537 | 5106 | |
e381bfe4 DO |
5107 | if (!rdev->constraints->always_on) { |
5108 | rdev_err(rdev, | |
5109 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5110 | return -ENOTSUPP; | |
5111 | } | |
5112 | ||
d3d64537 MP |
5113 | return 0; |
5114 | } | |
5115 | ||
d8ca7d18 DO |
5116 | static struct regulator_coupler generic_regulator_coupler = { |
5117 | .attach_regulator = generic_coupler_attach, | |
5118 | }; | |
5119 | ||
414c70cb LG |
5120 | /** |
5121 | * regulator_register - register regulator | |
69279fb9 | 5122 | * @regulator_desc: regulator to register |
f47531b1 | 5123 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5124 | * |
5125 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5126 | * Returns a valid pointer to struct regulator_dev on success |
5127 | * or an ERR_PTR() on error. | |
414c70cb | 5128 | */ |
65f26846 MB |
5129 | struct regulator_dev * |
5130 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 5131 | const struct regulator_config *cfg) |
414c70cb | 5132 | { |
9a8f5e07 | 5133 | const struct regulation_constraints *constraints = NULL; |
c172708d | 5134 | const struct regulator_init_data *init_data; |
1b3de223 | 5135 | struct regulator_config *config = NULL; |
72dca06f | 5136 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5137 | struct regulator_dev *rdev; |
0edb040d LW |
5138 | bool dangling_cfg_gpiod = false; |
5139 | bool dangling_of_gpiod = false; | |
32c8fad4 | 5140 | struct device *dev; |
a5766f11 | 5141 | int ret, i; |
414c70cb | 5142 | |
0edb040d | 5143 | if (cfg == NULL) |
414c70cb | 5144 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5145 | if (cfg->ena_gpiod) |
5146 | dangling_cfg_gpiod = true; | |
5147 | if (regulator_desc == NULL) { | |
5148 | ret = -EINVAL; | |
5149 | goto rinse; | |
5150 | } | |
414c70cb | 5151 | |
1b3de223 | 5152 | dev = cfg->dev; |
dcf70112 | 5153 | WARN_ON(!dev); |
32c8fad4 | 5154 | |
0edb040d LW |
5155 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5156 | ret = -EINVAL; | |
5157 | goto rinse; | |
5158 | } | |
414c70cb | 5159 | |
cd78dfc6 | 5160 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5161 | regulator_desc->type != REGULATOR_CURRENT) { |
5162 | ret = -EINVAL; | |
5163 | goto rinse; | |
5164 | } | |
414c70cb | 5165 | |
476c2d83 MB |
5166 | /* Only one of each should be implemented */ |
5167 | WARN_ON(regulator_desc->ops->get_voltage && | |
5168 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5169 | WARN_ON(regulator_desc->ops->set_voltage && |
5170 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5171 | |
5172 | /* If we're using selectors we must implement list_voltage. */ | |
5173 | if (regulator_desc->ops->get_voltage_sel && | |
5174 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5175 | ret = -EINVAL; |
5176 | goto rinse; | |
476c2d83 | 5177 | } |
e8eef82b MB |
5178 | if (regulator_desc->ops->set_voltage_sel && |
5179 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5180 | ret = -EINVAL; |
5181 | goto rinse; | |
e8eef82b | 5182 | } |
476c2d83 | 5183 | |
414c70cb | 5184 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5185 | if (rdev == NULL) { |
5186 | ret = -ENOMEM; | |
5187 | goto rinse; | |
5188 | } | |
d3c73156 | 5189 | device_initialize(&rdev->dev); |
414c70cb | 5190 | |
1b3de223 KK |
5191 | /* |
5192 | * Duplicate the config so the driver could override it after | |
5193 | * parsing init data. | |
5194 | */ | |
5195 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5196 | if (config == NULL) { | |
0edb040d | 5197 | ret = -ENOMEM; |
d3c73156 | 5198 | goto clean; |
1b3de223 KK |
5199 | } |
5200 | ||
bfa21a0d | 5201 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5202 | &rdev->dev.of_node); |
f8970d34 MF |
5203 | |
5204 | /* | |
5205 | * Sometimes not all resources are probed already so we need to take | |
5206 | * that into account. This happens most the time if the ena_gpiod comes | |
5207 | * from a gpio extender or something else. | |
5208 | */ | |
5209 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
f8970d34 | 5210 | ret = -EPROBE_DEFER; |
d3c73156 | 5211 | goto clean; |
f8970d34 MF |
5212 | } |
5213 | ||
0edb040d LW |
5214 | /* |
5215 | * We need to keep track of any GPIO descriptor coming from the | |
5216 | * device tree until we have handled it over to the core. If the | |
5217 | * config that was passed in to this function DOES NOT contain | |
5218 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5219 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5220 | * tree. |
5221 | */ | |
5222 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5223 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5224 | if (!init_data) { |
5225 | init_data = config->init_data; | |
5226 | rdev->dev.of_node = of_node_get(config->of_node); | |
5227 | } | |
5228 | ||
f8702f9e | 5229 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5230 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5231 | rdev->owner = regulator_desc->owner; |
5232 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5233 | if (config->regmap) |
5234 | rdev->regmap = config->regmap; | |
52b84dac | 5235 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5236 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5237 | else if (dev->parent) |
5238 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5239 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5240 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5241 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5242 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5243 | |
a5766f11 | 5244 | /* preform any regulator specific init */ |
9a8f5e07 | 5245 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5246 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
5247 | if (ret < 0) |
5248 | goto clean; | |
a5766f11 LG |
5249 | } |
5250 | ||
541d052d | 5251 | if (config->ena_gpiod) { |
daad134d KA |
5252 | ret = regulator_ena_gpio_request(rdev, config); |
5253 | if (ret != 0) { | |
541d052d LW |
5254 | rdev_err(rdev, "Failed to request enable GPIO: %d\n", |
5255 | ret); | |
32165230 | 5256 | goto clean; |
daad134d | 5257 | } |
0edb040d LW |
5258 | /* The regulator core took over the GPIO descriptor */ |
5259 | dangling_cfg_gpiod = false; | |
5260 | dangling_of_gpiod = false; | |
daad134d KA |
5261 | } |
5262 | ||
a5766f11 | 5263 | /* register with sysfs */ |
414c70cb | 5264 | rdev->dev.class = ®ulator_class; |
a5766f11 | 5265 | rdev->dev.parent = dev; |
72dca06f | 5266 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5267 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5268 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5269 | |
74f544c1 | 5270 | /* set regulator constraints */ |
9a8f5e07 MB |
5271 | if (init_data) |
5272 | constraints = &init_data->constraints; | |
5273 | ||
9a8f5e07 | 5274 | if (init_data && init_data->supply_regulator) |
6261b06d | 5275 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 5276 | else if (regulator_desc->supply_name) |
6261b06d | 5277 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 5278 | |
45389c47 JH |
5279 | /* |
5280 | * Attempt to resolve the regulator supply, if specified, | |
5281 | * but don't return an error if we fail because we will try | |
5282 | * to resolve it again later as more regulators are added. | |
5283 | */ | |
5284 | if (regulator_resolve_supply(rdev)) | |
5285 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
5286 | ||
5287 | ret = set_machine_constraints(rdev, constraints); | |
5288 | if (ret < 0) | |
5289 | goto wash; | |
5290 | ||
f9503385 DO |
5291 | ret = regulator_init_coupling(rdev); |
5292 | if (ret < 0) | |
d3d64537 MP |
5293 | goto wash; |
5294 | ||
a5766f11 | 5295 | /* add consumers devices */ |
9a8f5e07 MB |
5296 | if (init_data) { |
5297 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
5298 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5299 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5300 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
5301 | if (ret < 0) { |
5302 | dev_err(dev, "Failed to set supply %s\n", | |
5303 | init_data->consumer_supplies[i].supply); | |
5304 | goto unset_supplies; | |
5305 | } | |
23c2f041 | 5306 | } |
414c70cb | 5307 | } |
a5766f11 | 5308 | |
fd086045 MK |
5309 | if (!rdev->desc->ops->get_voltage && |
5310 | !rdev->desc->ops->list_voltage && | |
5311 | !rdev->desc->fixed_uV) | |
5312 | rdev->is_switch = true; | |
5313 | ||
9177514c VZ |
5314 | ret = device_add(&rdev->dev); |
5315 | if (ret != 0) | |
c438b9d0 | 5316 | goto unset_supplies; |
c438b9d0 | 5317 | |
1130e5b3 | 5318 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5319 | |
f9503385 DO |
5320 | /* try to resolve regulators coupling since a new one was registered */ |
5321 | mutex_lock(®ulator_list_mutex); | |
5322 | regulator_resolve_coupling(rdev); | |
5323 | mutex_unlock(®ulator_list_mutex); | |
5324 | ||
5e3ca2b3 JMC |
5325 | /* try to resolve regulators supply since a new one was registered */ |
5326 | class_for_each_device(®ulator_class, NULL, NULL, | |
5327 | regulator_register_resolve_supply); | |
1b3de223 | 5328 | kfree(config); |
414c70cb | 5329 | return rdev; |
4fca9545 | 5330 | |
d4033b54 | 5331 | unset_supplies: |
45389c47 | 5332 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5333 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5334 | regulator_remove_coupling(rdev); |
45389c47 | 5335 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5336 | wash: |
26c2c997 | 5337 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5338 | mutex_lock(®ulator_list_mutex); |
32165230 | 5339 | regulator_ena_gpio_free(rdev); |
45389c47 | 5340 | mutex_unlock(®ulator_list_mutex); |
4fca9545 | 5341 | clean: |
0edb040d LW |
5342 | if (dangling_of_gpiod) |
5343 | gpiod_put(config->ena_gpiod); | |
a2151374 | 5344 | kfree(config); |
d3c73156 | 5345 | put_device(&rdev->dev); |
0edb040d LW |
5346 | rinse: |
5347 | if (dangling_cfg_gpiod) | |
5348 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5349 | return ERR_PTR(ret); |
414c70cb LG |
5350 | } |
5351 | EXPORT_SYMBOL_GPL(regulator_register); | |
5352 | ||
5353 | /** | |
5354 | * regulator_unregister - unregister regulator | |
69279fb9 | 5355 | * @rdev: regulator to unregister |
414c70cb LG |
5356 | * |
5357 | * Called by regulator drivers to unregister a regulator. | |
5358 | */ | |
5359 | void regulator_unregister(struct regulator_dev *rdev) | |
5360 | { | |
5361 | if (rdev == NULL) | |
5362 | return; | |
5363 | ||
891636ea MB |
5364 | if (rdev->supply) { |
5365 | while (rdev->use_count--) | |
5366 | regulator_disable(rdev->supply); | |
e032b376 | 5367 | regulator_put(rdev->supply); |
891636ea | 5368 | } |
ff9b34b6 | 5369 | |
06377301 CK |
5370 | flush_work(&rdev->disable_work.work); |
5371 | ||
414c70cb | 5372 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5373 | |
1130e5b3 | 5374 | debugfs_remove_recursive(rdev->debugfs); |
6bf87d17 | 5375 | WARN_ON(rdev->open_count); |
6303f3e7 | 5376 | regulator_remove_coupling(rdev); |
0f1d747b | 5377 | unset_regulator_supplies(rdev); |
414c70cb | 5378 | list_del(&rdev->list); |
f19b00da | 5379 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5380 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5381 | |
5382 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5383 | } |
5384 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5385 | ||
f7efad10 | 5386 | #ifdef CONFIG_SUSPEND |
414c70cb | 5387 | /** |
0380cf7d | 5388 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5389 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5390 | * |
5391 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5392 | */ |
0380cf7d | 5393 | static int regulator_suspend(struct device *dev) |
414c70cb | 5394 | { |
cd7e36ab | 5395 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5396 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab | 5397 | int ret; |
0955f5be SB |
5398 | const struct regulator_state *rstate; |
5399 | ||
5400 | rstate = regulator_get_suspend_state_check(rdev, state); | |
5401 | if (!rstate) | |
5402 | return 0; | |
cd7e36ab MS |
5403 | |
5404 | regulator_lock(rdev); | |
0955f5be | 5405 | ret = __suspend_set_state(rdev, rstate); |
cd7e36ab | 5406 | regulator_unlock(rdev); |
414c70cb | 5407 | |
cd7e36ab | 5408 | return ret; |
85f3b431 | 5409 | } |
d3e4eccb | 5410 | |
cd7e36ab | 5411 | static int regulator_resume(struct device *dev) |
85f3b431 | 5412 | { |
cd7e36ab | 5413 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5414 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5415 | struct regulator_state *rstate; |
cd7e36ab | 5416 | int ret = 0; |
f7efad10 | 5417 | |
cd7e36ab | 5418 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5419 | if (rstate == NULL) |
35b5f14e | 5420 | return 0; |
414c70cb | 5421 | |
0955f5be SB |
5422 | /* Avoid grabbing the lock if we don't need to */ |
5423 | if (!rdev->desc->ops->resume) | |
5424 | return 0; | |
5425 | ||
66cf9a7e | 5426 | regulator_lock(rdev); |
85f3b431 | 5427 | |
0955f5be SB |
5428 | if (rstate->enabled == ENABLE_IN_SUSPEND || |
5429 | rstate->enabled == DISABLE_IN_SUSPEND) | |
0380cf7d | 5430 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5431 | |
66cf9a7e | 5432 | regulator_unlock(rdev); |
85f3b431 | 5433 | |
f7efad10 | 5434 | return ret; |
414c70cb | 5435 | } |
f7efad10 CZ |
5436 | #else /* !CONFIG_SUSPEND */ |
5437 | ||
0380cf7d | 5438 | #define regulator_suspend NULL |
5439 | #define regulator_resume NULL | |
f7efad10 CZ |
5440 | |
5441 | #endif /* !CONFIG_SUSPEND */ | |
5442 | ||
5443 | #ifdef CONFIG_PM | |
5444 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5445 | .suspend = regulator_suspend, |
5446 | .resume = regulator_resume, | |
f7efad10 CZ |
5447 | }; |
5448 | #endif | |
5449 | ||
285c22de | 5450 | struct class regulator_class = { |
f7efad10 CZ |
5451 | .name = "regulator", |
5452 | .dev_release = regulator_dev_release, | |
5453 | .dev_groups = regulator_dev_groups, | |
5454 | #ifdef CONFIG_PM | |
5455 | .pm = ®ulator_pm_ops, | |
5456 | #endif | |
5457 | }; | |
ca725561 MB |
5458 | /** |
5459 | * regulator_has_full_constraints - the system has fully specified constraints | |
5460 | * | |
5461 | * Calling this function will cause the regulator API to disable all | |
5462 | * regulators which have a zero use count and don't have an always_on | |
5463 | * constraint in a late_initcall. | |
5464 | * | |
5465 | * The intention is that this will become the default behaviour in a | |
5466 | * future kernel release so users are encouraged to use this facility | |
5467 | * now. | |
5468 | */ | |
5469 | void regulator_has_full_constraints(void) | |
5470 | { | |
5471 | has_full_constraints = 1; | |
5472 | } | |
5473 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5474 | ||
414c70cb LG |
5475 | /** |
5476 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5477 | * @rdev: regulator |
414c70cb LG |
5478 | * |
5479 | * Get rdev regulator driver private data. This call can be used in the | |
5480 | * regulator driver context. | |
5481 | */ | |
5482 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5483 | { | |
5484 | return rdev->reg_data; | |
5485 | } | |
5486 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5487 | ||
5488 | /** | |
5489 | * regulator_get_drvdata - get regulator driver data | |
5490 | * @regulator: regulator | |
5491 | * | |
5492 | * Get regulator driver private data. This call can be used in the consumer | |
5493 | * driver context when non API regulator specific functions need to be called. | |
5494 | */ | |
5495 | void *regulator_get_drvdata(struct regulator *regulator) | |
5496 | { | |
5497 | return regulator->rdev->reg_data; | |
5498 | } | |
5499 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5500 | ||
5501 | /** | |
5502 | * regulator_set_drvdata - set regulator driver data | |
5503 | * @regulator: regulator | |
5504 | * @data: data | |
5505 | */ | |
5506 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5507 | { | |
5508 | regulator->rdev->reg_data = data; | |
5509 | } | |
5510 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5511 | ||
5512 | /** | |
5513 | * regulator_get_id - get regulator ID | |
69279fb9 | 5514 | * @rdev: regulator |
414c70cb LG |
5515 | */ |
5516 | int rdev_get_id(struct regulator_dev *rdev) | |
5517 | { | |
5518 | return rdev->desc->id; | |
5519 | } | |
5520 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5521 | ||
a5766f11 LG |
5522 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5523 | { | |
5524 | return &rdev->dev; | |
5525 | } | |
5526 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5527 | ||
03c87b95 BG |
5528 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5529 | { | |
5530 | return rdev->regmap; | |
5531 | } | |
5532 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5533 | ||
a5766f11 LG |
5534 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5535 | { | |
5536 | return reg_init_data->driver_data; | |
5537 | } | |
5538 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5539 | ||
ba55a974 | 5540 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5541 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5542 | { |
ba55a974 MB |
5543 | struct regulator_map *map; |
5544 | ||
ba55a974 | 5545 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5546 | seq_printf(sf, "%s -> %s.%s\n", |
5547 | rdev_get_name(map->regulator), map->dev_name, | |
5548 | map->supply); | |
ba55a974 MB |
5549 | } |
5550 | ||
dbc55955 HZ |
5551 | return 0; |
5552 | } | |
3e60b4fc | 5553 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5554 | |
85f3b431 TV |
5555 | struct summary_data { |
5556 | struct seq_file *s; | |
5557 | struct regulator_dev *parent; | |
5558 | int level; | |
5559 | }; | |
5560 | ||
5561 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5562 | struct regulator_dev *rdev, | |
5563 | int level); | |
5564 | ||
5565 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5566 | { | |
5567 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5568 | struct summary_data *summary_data = data; | |
5569 | ||
5570 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5571 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5572 | summary_data->level + 1); | |
5573 | ||
5574 | return 0; | |
5575 | } | |
5576 | ||
7c225ec9 HS |
5577 | static void regulator_summary_show_subtree(struct seq_file *s, |
5578 | struct regulator_dev *rdev, | |
5579 | int level) | |
5580 | { | |
7c225ec9 HS |
5581 | struct regulation_constraints *c; |
5582 | struct regulator *consumer; | |
85f3b431 | 5583 | struct summary_data summary_data; |
7e4d9683 | 5584 | unsigned int opmode; |
7c225ec9 HS |
5585 | |
5586 | if (!rdev) | |
5587 | return; | |
5588 | ||
7e4d9683 | 5589 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5590 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5591 | level * 3 + 1, "", |
5592 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5593 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5594 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5595 | |
d22b85a1 | 5596 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5597 | seq_printf(s, "%5dmA ", |
5598 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5599 | |
5600 | c = rdev->constraints; | |
5601 | if (c) { | |
5602 | switch (rdev->desc->type) { | |
5603 | case REGULATOR_VOLTAGE: | |
5604 | seq_printf(s, "%5dmV %5dmV ", | |
5605 | c->min_uV / 1000, c->max_uV / 1000); | |
5606 | break; | |
5607 | case REGULATOR_CURRENT: | |
5608 | seq_printf(s, "%5dmA %5dmA ", | |
5609 | c->min_uA / 1000, c->max_uA / 1000); | |
5610 | break; | |
5611 | } | |
5612 | } | |
5613 | ||
5614 | seq_puts(s, "\n"); | |
5615 | ||
5616 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5617 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5618 | continue; |
5619 | ||
5620 | seq_printf(s, "%*s%-*s ", | |
5621 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5622 | 30 - (level + 1) * 3, |
6b576eb0 | 5623 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5624 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5625 | |
5626 | switch (rdev->desc->type) { | |
5627 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5628 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5629 | consumer->enable_count, | |
7d3827b5 | 5630 | consumer->uA_load / 1000, |
5451781d DA |
5631 | consumer->uA_load && !consumer->enable_count ? |
5632 | '*' : ' ', | |
c360a6df CZ |
5633 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5634 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5635 | break; |
5636 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5637 | break; |
5638 | } | |
5639 | ||
5640 | seq_puts(s, "\n"); | |
5641 | } | |
5642 | ||
85f3b431 TV |
5643 | summary_data.s = s; |
5644 | summary_data.level = level; | |
5645 | summary_data.parent = rdev; | |
7c225ec9 | 5646 | |
85f3b431 TV |
5647 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5648 | regulator_summary_show_children); | |
f8702f9e DO |
5649 | } |
5650 | ||
5651 | struct summary_lock_data { | |
5652 | struct ww_acquire_ctx *ww_ctx; | |
5653 | struct regulator_dev **new_contended_rdev; | |
5654 | struct regulator_dev **old_contended_rdev; | |
5655 | }; | |
5656 | ||
5657 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5658 | { | |
5659 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5660 | struct summary_lock_data *lock_data = data; | |
5661 | int ret = 0; | |
5662 | ||
5663 | if (rdev != *lock_data->old_contended_rdev) { | |
5664 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5665 | ||
5666 | if (ret == -EDEADLK) | |
5667 | *lock_data->new_contended_rdev = rdev; | |
5668 | else | |
5669 | WARN_ON_ONCE(ret); | |
5670 | } else { | |
5671 | *lock_data->old_contended_rdev = NULL; | |
5672 | } | |
5673 | ||
5674 | return ret; | |
5675 | } | |
5676 | ||
5677 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5678 | { | |
5679 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5680 | struct summary_lock_data *lock_data = data; | |
5681 | ||
5682 | if (lock_data) { | |
5683 | if (rdev == *lock_data->new_contended_rdev) | |
5684 | return -EDEADLK; | |
5685 | } | |
7e4d9683 DA |
5686 | |
5687 | regulator_unlock(rdev); | |
f8702f9e DO |
5688 | |
5689 | return 0; | |
5690 | } | |
5691 | ||
5692 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5693 | struct regulator_dev **new_contended_rdev, | |
5694 | struct regulator_dev **old_contended_rdev) | |
5695 | { | |
5696 | struct summary_lock_data lock_data; | |
5697 | int ret; | |
5698 | ||
5699 | lock_data.ww_ctx = ww_ctx; | |
5700 | lock_data.new_contended_rdev = new_contended_rdev; | |
5701 | lock_data.old_contended_rdev = old_contended_rdev; | |
5702 | ||
5703 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5704 | regulator_summary_lock_one); | |
5705 | if (ret) | |
5706 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5707 | regulator_summary_unlock_one); | |
5708 | ||
5709 | return ret; | |
5710 | } | |
5711 | ||
5712 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5713 | { | |
5714 | struct regulator_dev *new_contended_rdev = NULL; | |
5715 | struct regulator_dev *old_contended_rdev = NULL; | |
5716 | int err; | |
5717 | ||
ff9b34b6 DO |
5718 | mutex_lock(®ulator_list_mutex); |
5719 | ||
f8702f9e DO |
5720 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5721 | ||
5722 | do { | |
5723 | if (new_contended_rdev) { | |
5724 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5725 | old_contended_rdev = new_contended_rdev; | |
5726 | old_contended_rdev->ref_cnt++; | |
5727 | } | |
5728 | ||
5729 | err = regulator_summary_lock_all(ww_ctx, | |
5730 | &new_contended_rdev, | |
5731 | &old_contended_rdev); | |
5732 | ||
5733 | if (old_contended_rdev) | |
5734 | regulator_unlock(old_contended_rdev); | |
5735 | ||
5736 | } while (err == -EDEADLK); | |
5737 | ||
5738 | ww_acquire_done(ww_ctx); | |
5739 | } | |
5740 | ||
5741 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5742 | { | |
5743 | class_for_each_device(®ulator_class, NULL, NULL, | |
5744 | regulator_summary_unlock_one); | |
5745 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5746 | |
5747 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5748 | } |
5749 | ||
85f3b431 | 5750 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5751 | { |
85f3b431 TV |
5752 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5753 | struct seq_file *s = data; | |
7c225ec9 | 5754 | |
85f3b431 TV |
5755 | if (!rdev->supply) |
5756 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5757 | |
85f3b431 TV |
5758 | return 0; |
5759 | } | |
7c225ec9 | 5760 | |
85f3b431 TV |
5761 | static int regulator_summary_show(struct seq_file *s, void *data) |
5762 | { | |
f8702f9e DO |
5763 | struct ww_acquire_ctx ww_ctx; |
5764 | ||
01de19d0 DA |
5765 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5766 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5767 | |
f8702f9e DO |
5768 | regulator_summary_lock(&ww_ctx); |
5769 | ||
85f3b431 TV |
5770 | class_for_each_device(®ulator_class, NULL, s, |
5771 | regulator_summary_show_roots); | |
7c225ec9 | 5772 | |
f8702f9e DO |
5773 | regulator_summary_unlock(&ww_ctx); |
5774 | ||
7c225ec9 HS |
5775 | return 0; |
5776 | } | |
3e60b4fc YL |
5777 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5778 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5779 | |
414c70cb LG |
5780 | static int __init regulator_init(void) |
5781 | { | |
34abbd68 MB |
5782 | int ret; |
5783 | ||
34abbd68 MB |
5784 | ret = class_register(®ulator_class); |
5785 | ||
1130e5b3 | 5786 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5787 | if (!debugfs_root) |
1130e5b3 | 5788 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5789 | |
3e60b4fc | 5790 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5791 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5792 | &supply_map_fops); | |
1130e5b3 | 5793 | |
7c225ec9 | 5794 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5795 | NULL, ®ulator_summary_fops); |
3e60b4fc | 5796 | #endif |
34abbd68 MB |
5797 | regulator_dummy_init(); |
5798 | ||
d8ca7d18 DO |
5799 | regulator_coupler_register(&generic_regulator_coupler); |
5800 | ||
34abbd68 | 5801 | return ret; |
414c70cb LG |
5802 | } |
5803 | ||
5804 | /* init early to allow our consumers to complete system booting */ | |
5805 | core_initcall(regulator_init); | |
ca725561 | 5806 | |
55576cf1 | 5807 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5808 | { |
609ca5f3 MB |
5809 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5810 | const struct regulator_ops *ops = rdev->desc->ops; | |
5811 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5812 | int enabled, ret; |
ca725561 | 5813 | |
609ca5f3 MB |
5814 | if (c && c->always_on) |
5815 | return 0; | |
5816 | ||
8a34e979 | 5817 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5818 | return 0; |
5819 | ||
66cf9a7e | 5820 | regulator_lock(rdev); |
609ca5f3 MB |
5821 | |
5822 | if (rdev->use_count) | |
5823 | goto unlock; | |
5824 | ||
5825 | /* If we can't read the status assume it's on. */ | |
5826 | if (ops->is_enabled) | |
5827 | enabled = ops->is_enabled(rdev); | |
5828 | else | |
5829 | enabled = 1; | |
5830 | ||
5831 | if (!enabled) | |
5832 | goto unlock; | |
5833 | ||
5834 | if (have_full_constraints()) { | |
5835 | /* We log since this may kill the system if it goes | |
5836 | * wrong. */ | |
5837 | rdev_info(rdev, "disabling\n"); | |
5838 | ret = _regulator_do_disable(rdev); | |
5839 | if (ret != 0) | |
5840 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
5841 | } else { | |
5842 | /* The intention is that in future we will | |
5843 | * assume that full constraints are provided | |
5844 | * so warn even if we aren't going to do | |
5845 | * anything here. | |
5846 | */ | |
5847 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5848 | } | |
5849 | ||
5850 | unlock: | |
66cf9a7e | 5851 | regulator_unlock(rdev); |
609ca5f3 MB |
5852 | |
5853 | return 0; | |
5854 | } | |
5855 | ||
55576cf1 | 5856 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 5857 | { |
3827b64d JMC |
5858 | /* |
5859 | * Regulators may had failed to resolve their input supplies | |
5860 | * when were registered, either because the input supply was | |
5861 | * not registered yet or because its parent device was not | |
5862 | * bound yet. So attempt to resolve the input supplies for | |
5863 | * pending regulators before trying to disable unused ones. | |
5864 | */ | |
5865 | class_for_each_device(®ulator_class, NULL, NULL, | |
5866 | regulator_register_resolve_supply); | |
5867 | ||
ca725561 | 5868 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5869 | * we have permission to change the status for and which are |
5870 | * not in use or always_on. This is effectively the default | |
5871 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5872 | */ |
609ca5f3 MB |
5873 | class_for_each_device(®ulator_class, NULL, NULL, |
5874 | regulator_late_cleanup); | |
55576cf1 MB |
5875 | } |
5876 | ||
5877 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
5878 | regulator_init_complete_work_function); | |
5879 | ||
5880 | static int __init regulator_init_complete(void) | |
5881 | { | |
5882 | /* | |
5883 | * Since DT doesn't provide an idiomatic mechanism for | |
5884 | * enabling full constraints and since it's much more natural | |
5885 | * with DT to provide them just assume that a DT enabled | |
5886 | * system has full constraints. | |
5887 | */ | |
5888 | if (of_have_populated_dt()) | |
5889 | has_full_constraints = true; | |
5890 | ||
5891 | /* | |
2a15483b JS |
5892 | * We punt completion for an arbitrary amount of time since |
5893 | * systems like distros will load many drivers from userspace | |
5894 | * so consumers might not always be ready yet, this is | |
5895 | * particularly an issue with laptops where this might bounce | |
5896 | * the display off then on. Ideally we'd get a notification | |
5897 | * from userspace when this happens but we don't so just wait | |
5898 | * a bit and hope we waited long enough. It'd be better if | |
5899 | * we'd only do this on systems that need it, and a kernel | |
5900 | * command line option might be useful. | |
55576cf1 | 5901 | */ |
2a15483b JS |
5902 | schedule_delayed_work(®ulator_init_complete_work, |
5903 | msecs_to_jiffies(30000)); | |
ca725561 MB |
5904 | |
5905 | return 0; | |
5906 | } | |
fd482a3e | 5907 | late_initcall_sync(regulator_init_complete); |