Commit | Line | Data |
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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 | { |
0a7416f9 DO |
237 | struct regulator_dev *c_rdev, *supply_rdev; |
238 | int i, supply_n_coupled; | |
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 | ||
0a7416f9 DO |
246 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
247 | supply_rdev = c_rdev->supply->rdev; | |
248 | supply_n_coupled = supply_rdev->coupling_desc.n_coupled; | |
249 | ||
250 | regulator_unlock_recursive(supply_rdev, | |
251 | supply_n_coupled); | |
252 | } | |
9243a195 | 253 | |
f8702f9e DO |
254 | regulator_unlock(c_rdev); |
255 | } | |
9f01cd4a SH |
256 | } |
257 | ||
f8702f9e DO |
258 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
259 | struct regulator_dev **new_contended_rdev, | |
260 | struct regulator_dev **old_contended_rdev, | |
261 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 262 | { |
9243a195 | 263 | struct regulator_dev *c_rdev; |
f8702f9e | 264 | int i, err; |
9f01cd4a | 265 | |
9243a195 MP |
266 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
267 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 268 | |
9243a195 MP |
269 | if (!c_rdev) |
270 | continue; | |
9f01cd4a | 271 | |
f8702f9e DO |
272 | if (c_rdev != *old_contended_rdev) { |
273 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
274 | if (err) { | |
275 | if (err == -EDEADLK) { | |
276 | *new_contended_rdev = c_rdev; | |
277 | goto err_unlock; | |
278 | } | |
9243a195 | 279 | |
f8702f9e DO |
280 | /* shouldn't happen */ |
281 | WARN_ON_ONCE(err != -EALREADY); | |
282 | } | |
283 | } else { | |
284 | *old_contended_rdev = NULL; | |
285 | } | |
286 | ||
089e2cc2 | 287 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
288 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
289 | new_contended_rdev, | |
290 | old_contended_rdev, | |
291 | ww_ctx); | |
292 | if (err) { | |
293 | regulator_unlock(c_rdev); | |
294 | goto err_unlock; | |
295 | } | |
66cf9a7e MP |
296 | } |
297 | } | |
f8702f9e DO |
298 | |
299 | return 0; | |
300 | ||
301 | err_unlock: | |
302 | regulator_unlock_recursive(rdev, i); | |
303 | ||
304 | return err; | |
66cf9a7e MP |
305 | } |
306 | ||
38de19fa | 307 | /** |
f8702f9e DO |
308 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
309 | * regulators | |
310 | * @rdev: regulator source | |
311 | * @ww_ctx: w/w mutex acquire context | |
312 | * | |
48f1b4ef | 313 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 314 | */ |
f8702f9e DO |
315 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
316 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 317 | { |
f8702f9e DO |
318 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
319 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
320 | } |
321 | ||
322 | /** | |
9243a195 MP |
323 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
324 | * @rdev: regulator source | |
f8702f9e | 325 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
326 | * |
327 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 328 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 329 | */ |
f8702f9e DO |
330 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
331 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 332 | { |
f8702f9e DO |
333 | struct regulator_dev *new_contended_rdev = NULL; |
334 | struct regulator_dev *old_contended_rdev = NULL; | |
335 | int err; | |
9f01cd4a | 336 | |
f8702f9e | 337 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 338 | |
f8702f9e | 339 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 340 | |
f8702f9e DO |
341 | do { |
342 | if (new_contended_rdev) { | |
343 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
344 | old_contended_rdev = new_contended_rdev; | |
345 | old_contended_rdev->ref_cnt++; | |
346 | } | |
347 | ||
348 | err = regulator_lock_recursive(rdev, | |
349 | &new_contended_rdev, | |
350 | &old_contended_rdev, | |
351 | ww_ctx); | |
352 | ||
353 | if (old_contended_rdev) | |
354 | regulator_unlock(old_contended_rdev); | |
355 | ||
356 | } while (err == -EDEADLK); | |
357 | ||
358 | ww_acquire_done(ww_ctx); | |
359 | ||
360 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
361 | } |
362 | ||
fe06051d | 363 | /** |
364 | * of_get_child_regulator - get a child regulator device node | |
365 | * based on supply name | |
366 | * @parent: Parent device node | |
367 | * @prop_name: Combination regulator supply name and "-supply" | |
368 | * | |
369 | * Traverse all child nodes. | |
370 | * Extract the child regulator device node corresponding to the supply name. | |
371 | * returns the device node corresponding to the regulator if found, else | |
372 | * returns NULL. | |
373 | */ | |
374 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
375 | const char *prop_name) | |
376 | { | |
377 | struct device_node *regnode = NULL; | |
378 | struct device_node *child = NULL; | |
379 | ||
380 | for_each_child_of_node(parent, child) { | |
381 | regnode = of_parse_phandle(child, prop_name, 0); | |
382 | ||
383 | if (!regnode) { | |
384 | regnode = of_get_child_regulator(child, prop_name); | |
81eeb0a3 ND |
385 | if (regnode) |
386 | goto err_node_put; | |
fe06051d | 387 | } else { |
81eeb0a3 | 388 | goto err_node_put; |
fe06051d | 389 | } |
390 | } | |
391 | return NULL; | |
81eeb0a3 ND |
392 | |
393 | err_node_put: | |
394 | of_node_put(child); | |
395 | return regnode; | |
fe06051d | 396 | } |
397 | ||
69511a45 RN |
398 | /** |
399 | * of_get_regulator - get a regulator device node based on supply name | |
400 | * @dev: Device pointer for the consumer (of regulator) device | |
401 | * @supply: regulator supply name | |
402 | * | |
403 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 404 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
405 | * returns NULL. |
406 | */ | |
407 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
408 | { | |
409 | struct device_node *regnode = NULL; | |
e9bb4a06 | 410 | char prop_name[64]; /* 64 is max size of property name */ |
69511a45 RN |
411 | |
412 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
413 | ||
e9bb4a06 | 414 | snprintf(prop_name, 64, "%s-supply", supply); |
69511a45 RN |
415 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); |
416 | ||
417 | if (!regnode) { | |
fe06051d | 418 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
419 | if (regnode) | |
420 | return regnode; | |
421 | ||
7799167b RH |
422 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
423 | prop_name, dev->of_node); | |
69511a45 RN |
424 | return NULL; |
425 | } | |
426 | return regnode; | |
427 | } | |
428 | ||
414c70cb | 429 | /* Platform voltage constraint check */ |
d22b85a1 DO |
430 | int regulator_check_voltage(struct regulator_dev *rdev, |
431 | int *min_uV, int *max_uV) | |
414c70cb LG |
432 | { |
433 | BUG_ON(*min_uV > *max_uV); | |
434 | ||
8a34e979 | 435 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 436 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
437 | return -EPERM; |
438 | } | |
439 | ||
440 | if (*max_uV > rdev->constraints->max_uV) | |
441 | *max_uV = rdev->constraints->max_uV; | |
442 | if (*min_uV < rdev->constraints->min_uV) | |
443 | *min_uV = rdev->constraints->min_uV; | |
444 | ||
89f425ed MB |
445 | if (*min_uV > *max_uV) { |
446 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 447 | *min_uV, *max_uV); |
414c70cb | 448 | return -EINVAL; |
89f425ed | 449 | } |
414c70cb LG |
450 | |
451 | return 0; | |
452 | } | |
453 | ||
f7efad10 CZ |
454 | /* return 0 if the state is valid */ |
455 | static int regulator_check_states(suspend_state_t state) | |
456 | { | |
457 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
458 | } | |
459 | ||
05fda3b1 TP |
460 | /* Make sure we select a voltage that suits the needs of all |
461 | * regulator consumers | |
462 | */ | |
d22b85a1 DO |
463 | int regulator_check_consumers(struct regulator_dev *rdev, |
464 | int *min_uV, int *max_uV, | |
465 | suspend_state_t state) | |
05fda3b1 TP |
466 | { |
467 | struct regulator *regulator; | |
c360a6df | 468 | struct regulator_voltage *voltage; |
05fda3b1 TP |
469 | |
470 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 471 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
472 | /* |
473 | * Assume consumers that didn't say anything are OK | |
474 | * with anything in the constraint range. | |
475 | */ | |
c360a6df | 476 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
477 | continue; |
478 | ||
c360a6df CZ |
479 | if (*max_uV > voltage->max_uV) |
480 | *max_uV = voltage->max_uV; | |
481 | if (*min_uV < voltage->min_uV) | |
482 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
483 | } |
484 | ||
dd8004af | 485 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
486 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
487 | *min_uV, *max_uV); | |
05fda3b1 | 488 | return -EINVAL; |
dd8004af | 489 | } |
05fda3b1 TP |
490 | |
491 | return 0; | |
492 | } | |
493 | ||
414c70cb LG |
494 | /* current constraint check */ |
495 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
496 | int *min_uA, int *max_uA) | |
497 | { | |
498 | BUG_ON(*min_uA > *max_uA); | |
499 | ||
8a34e979 | 500 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 501 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
502 | return -EPERM; |
503 | } | |
504 | ||
505 | if (*max_uA > rdev->constraints->max_uA) | |
506 | *max_uA = rdev->constraints->max_uA; | |
507 | if (*min_uA < rdev->constraints->min_uA) | |
508 | *min_uA = rdev->constraints->min_uA; | |
509 | ||
89f425ed MB |
510 | if (*min_uA > *max_uA) { |
511 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 512 | *min_uA, *max_uA); |
414c70cb | 513 | return -EINVAL; |
89f425ed | 514 | } |
414c70cb LG |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* operating mode constraint check */ | |
109c75af CK |
520 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
521 | unsigned int *mode) | |
414c70cb | 522 | { |
2c608234 | 523 | switch (*mode) { |
e573520b DB |
524 | case REGULATOR_MODE_FAST: |
525 | case REGULATOR_MODE_NORMAL: | |
526 | case REGULATOR_MODE_IDLE: | |
527 | case REGULATOR_MODE_STANDBY: | |
528 | break; | |
529 | default: | |
89f425ed | 530 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
531 | return -EINVAL; |
532 | } | |
533 | ||
8a34e979 | 534 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 535 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
536 | return -EPERM; |
537 | } | |
2c608234 MB |
538 | |
539 | /* The modes are bitmasks, the most power hungry modes having | |
540 | * the lowest values. If the requested mode isn't supported | |
69b8821e SK |
541 | * try higher modes. |
542 | */ | |
2c608234 MB |
543 | while (*mode) { |
544 | if (rdev->constraints->valid_modes_mask & *mode) | |
545 | return 0; | |
546 | *mode /= 2; | |
414c70cb | 547 | } |
2c608234 MB |
548 | |
549 | return -EINVAL; | |
414c70cb LG |
550 | } |
551 | ||
f7efad10 CZ |
552 | static inline struct regulator_state * |
553 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
554 | { | |
555 | if (rdev->constraints == NULL) | |
556 | return NULL; | |
557 | ||
558 | switch (state) { | |
559 | case PM_SUSPEND_STANDBY: | |
560 | return &rdev->constraints->state_standby; | |
561 | case PM_SUSPEND_MEM: | |
562 | return &rdev->constraints->state_mem; | |
563 | case PM_SUSPEND_MAX: | |
564 | return &rdev->constraints->state_disk; | |
565 | default: | |
566 | return NULL; | |
567 | } | |
568 | } | |
569 | ||
0955f5be SB |
570 | static const struct regulator_state * |
571 | regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state) | |
572 | { | |
573 | const struct regulator_state *rstate; | |
574 | ||
575 | rstate = regulator_get_suspend_state(rdev, state); | |
576 | if (rstate == NULL) | |
577 | return NULL; | |
578 | ||
579 | /* If we have no suspend mode configuration don't set anything; | |
580 | * only warn if the driver implements set_suspend_voltage or | |
581 | * set_suspend_mode callback. | |
582 | */ | |
583 | if (rstate->enabled != ENABLE_IN_SUSPEND && | |
584 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
585 | if (rdev->desc->ops->set_suspend_voltage || | |
586 | rdev->desc->ops->set_suspend_mode) | |
587 | rdev_warn(rdev, "No configuration\n"); | |
588 | return NULL; | |
589 | } | |
590 | ||
591 | return rstate; | |
592 | } | |
593 | ||
414c70cb LG |
594 | static ssize_t regulator_uV_show(struct device *dev, |
595 | struct device_attribute *attr, char *buf) | |
596 | { | |
a5766f11 | 597 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
c82f27df | 598 | int uV; |
414c70cb | 599 | |
66cf9a7e | 600 | regulator_lock(rdev); |
c82f27df | 601 | uV = regulator_get_voltage_rdev(rdev); |
66cf9a7e | 602 | regulator_unlock(rdev); |
414c70cb | 603 | |
c82f27df NS |
604 | if (uV < 0) |
605 | return uV; | |
606 | return sprintf(buf, "%d\n", uV); | |
414c70cb | 607 | } |
7ad68e2f | 608 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
609 | |
610 | static ssize_t regulator_uA_show(struct device *dev, | |
611 | struct device_attribute *attr, char *buf) | |
612 | { | |
a5766f11 | 613 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
614 | |
615 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
616 | } | |
7ad68e2f | 617 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 618 | |
587cea27 GKH |
619 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
620 | char *buf) | |
bc558a60 MB |
621 | { |
622 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 623 | |
1083c393 | 624 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 625 | } |
587cea27 | 626 | static DEVICE_ATTR_RO(name); |
bc558a60 | 627 | |
01de19d0 | 628 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 629 | { |
414c70cb LG |
630 | switch (mode) { |
631 | case REGULATOR_MODE_FAST: | |
01de19d0 | 632 | return "fast"; |
414c70cb | 633 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 634 | return "normal"; |
414c70cb | 635 | case REGULATOR_MODE_IDLE: |
01de19d0 | 636 | return "idle"; |
414c70cb | 637 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 638 | return "standby"; |
414c70cb | 639 | } |
01de19d0 DA |
640 | return "unknown"; |
641 | } | |
642 | ||
643 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
644 | { | |
645 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
646 | } |
647 | ||
4fca9545 DB |
648 | static ssize_t regulator_opmode_show(struct device *dev, |
649 | struct device_attribute *attr, char *buf) | |
414c70cb | 650 | { |
a5766f11 | 651 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 652 | |
4fca9545 DB |
653 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
654 | } | |
7ad68e2f | 655 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
656 | |
657 | static ssize_t regulator_print_state(char *buf, int state) | |
658 | { | |
414c70cb LG |
659 | if (state > 0) |
660 | return sprintf(buf, "enabled\n"); | |
661 | else if (state == 0) | |
662 | return sprintf(buf, "disabled\n"); | |
663 | else | |
664 | return sprintf(buf, "unknown\n"); | |
665 | } | |
666 | ||
4fca9545 DB |
667 | static ssize_t regulator_state_show(struct device *dev, |
668 | struct device_attribute *attr, char *buf) | |
669 | { | |
670 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
671 | ssize_t ret; |
672 | ||
66cf9a7e | 673 | regulator_lock(rdev); |
9332546f | 674 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 675 | regulator_unlock(rdev); |
4fca9545 | 676 | |
9332546f | 677 | return ret; |
4fca9545 | 678 | } |
7ad68e2f | 679 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 680 | |
853116a1 DB |
681 | static ssize_t regulator_status_show(struct device *dev, |
682 | struct device_attribute *attr, char *buf) | |
683 | { | |
684 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
685 | int status; | |
686 | char *label; | |
687 | ||
688 | status = rdev->desc->ops->get_status(rdev); | |
689 | if (status < 0) | |
690 | return status; | |
691 | ||
692 | switch (status) { | |
693 | case REGULATOR_STATUS_OFF: | |
694 | label = "off"; | |
695 | break; | |
696 | case REGULATOR_STATUS_ON: | |
697 | label = "on"; | |
698 | break; | |
699 | case REGULATOR_STATUS_ERROR: | |
700 | label = "error"; | |
701 | break; | |
702 | case REGULATOR_STATUS_FAST: | |
703 | label = "fast"; | |
704 | break; | |
705 | case REGULATOR_STATUS_NORMAL: | |
706 | label = "normal"; | |
707 | break; | |
708 | case REGULATOR_STATUS_IDLE: | |
709 | label = "idle"; | |
710 | break; | |
711 | case REGULATOR_STATUS_STANDBY: | |
712 | label = "standby"; | |
713 | break; | |
f59c8f9f MB |
714 | case REGULATOR_STATUS_BYPASS: |
715 | label = "bypass"; | |
716 | break; | |
1beaf762 KG |
717 | case REGULATOR_STATUS_UNDEFINED: |
718 | label = "undefined"; | |
719 | break; | |
853116a1 DB |
720 | default: |
721 | return -ERANGE; | |
722 | } | |
723 | ||
724 | return sprintf(buf, "%s\n", label); | |
725 | } | |
726 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
727 | ||
414c70cb LG |
728 | static ssize_t regulator_min_uA_show(struct device *dev, |
729 | struct device_attribute *attr, char *buf) | |
730 | { | |
a5766f11 | 731 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
732 | |
733 | if (!rdev->constraints) | |
734 | return sprintf(buf, "constraint not defined\n"); | |
735 | ||
736 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
737 | } | |
7ad68e2f | 738 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
739 | |
740 | static ssize_t regulator_max_uA_show(struct device *dev, | |
741 | struct device_attribute *attr, char *buf) | |
742 | { | |
a5766f11 | 743 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
744 | |
745 | if (!rdev->constraints) | |
746 | return sprintf(buf, "constraint not defined\n"); | |
747 | ||
748 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
749 | } | |
7ad68e2f | 750 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
751 | |
752 | static ssize_t regulator_min_uV_show(struct device *dev, | |
753 | struct device_attribute *attr, char *buf) | |
754 | { | |
a5766f11 | 755 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
756 | |
757 | if (!rdev->constraints) | |
758 | return sprintf(buf, "constraint not defined\n"); | |
759 | ||
760 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
761 | } | |
7ad68e2f | 762 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
763 | |
764 | static ssize_t regulator_max_uV_show(struct device *dev, | |
765 | struct device_attribute *attr, char *buf) | |
766 | { | |
a5766f11 | 767 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
768 | |
769 | if (!rdev->constraints) | |
770 | return sprintf(buf, "constraint not defined\n"); | |
771 | ||
772 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
773 | } | |
7ad68e2f | 774 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
775 | |
776 | static ssize_t regulator_total_uA_show(struct device *dev, | |
777 | struct device_attribute *attr, char *buf) | |
778 | { | |
a5766f11 | 779 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
780 | struct regulator *regulator; |
781 | int uA = 0; | |
782 | ||
66cf9a7e | 783 | regulator_lock(rdev); |
5451781d DA |
784 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
785 | if (regulator->enable_count) | |
786 | uA += regulator->uA_load; | |
787 | } | |
66cf9a7e | 788 | regulator_unlock(rdev); |
414c70cb LG |
789 | return sprintf(buf, "%d\n", uA); |
790 | } | |
7ad68e2f | 791 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 792 | |
587cea27 GKH |
793 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
794 | char *buf) | |
414c70cb | 795 | { |
a5766f11 | 796 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
797 | return sprintf(buf, "%d\n", rdev->use_count); |
798 | } | |
587cea27 | 799 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 800 | |
587cea27 GKH |
801 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
802 | char *buf) | |
414c70cb | 803 | { |
a5766f11 | 804 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
805 | |
806 | switch (rdev->desc->type) { | |
807 | case REGULATOR_VOLTAGE: | |
808 | return sprintf(buf, "voltage\n"); | |
809 | case REGULATOR_CURRENT: | |
810 | return sprintf(buf, "current\n"); | |
811 | } | |
812 | return sprintf(buf, "unknown\n"); | |
813 | } | |
587cea27 | 814 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
815 | |
816 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
817 | struct device_attribute *attr, char *buf) | |
818 | { | |
a5766f11 | 819 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 820 | |
414c70cb LG |
821 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
822 | } | |
7ad68e2f DB |
823 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
824 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
825 | |
826 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
827 | struct device_attribute *attr, char *buf) | |
828 | { | |
a5766f11 | 829 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 830 | |
414c70cb LG |
831 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
832 | } | |
7ad68e2f DB |
833 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
834 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
835 | |
836 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
837 | struct device_attribute *attr, char *buf) | |
838 | { | |
a5766f11 | 839 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 840 | |
414c70cb LG |
841 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
842 | } | |
7ad68e2f DB |
843 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
844 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 845 | |
414c70cb LG |
846 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
847 | struct device_attribute *attr, char *buf) | |
848 | { | |
a5766f11 | 849 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 850 | |
4fca9545 DB |
851 | return regulator_print_opmode(buf, |
852 | rdev->constraints->state_mem.mode); | |
414c70cb | 853 | } |
7ad68e2f DB |
854 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
855 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
856 | |
857 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
858 | struct device_attribute *attr, char *buf) | |
859 | { | |
a5766f11 | 860 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 861 | |
4fca9545 DB |
862 | return regulator_print_opmode(buf, |
863 | rdev->constraints->state_disk.mode); | |
414c70cb | 864 | } |
7ad68e2f DB |
865 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
866 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
867 | |
868 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
869 | struct device_attribute *attr, char *buf) | |
870 | { | |
a5766f11 | 871 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 872 | |
4fca9545 DB |
873 | return regulator_print_opmode(buf, |
874 | rdev->constraints->state_standby.mode); | |
414c70cb | 875 | } |
7ad68e2f DB |
876 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
877 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
878 | |
879 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
880 | struct device_attribute *attr, char *buf) | |
881 | { | |
a5766f11 | 882 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 883 | |
4fca9545 DB |
884 | return regulator_print_state(buf, |
885 | rdev->constraints->state_mem.enabled); | |
414c70cb | 886 | } |
7ad68e2f DB |
887 | static DEVICE_ATTR(suspend_mem_state, 0444, |
888 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
889 | |
890 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
891 | struct device_attribute *attr, char *buf) | |
892 | { | |
a5766f11 | 893 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 894 | |
4fca9545 DB |
895 | return regulator_print_state(buf, |
896 | rdev->constraints->state_disk.enabled); | |
414c70cb | 897 | } |
7ad68e2f DB |
898 | static DEVICE_ATTR(suspend_disk_state, 0444, |
899 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
900 | |
901 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
902 | struct device_attribute *attr, char *buf) | |
903 | { | |
a5766f11 | 904 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 905 | |
4fca9545 DB |
906 | return regulator_print_state(buf, |
907 | rdev->constraints->state_standby.enabled); | |
414c70cb | 908 | } |
7ad68e2f DB |
909 | static DEVICE_ATTR(suspend_standby_state, 0444, |
910 | regulator_suspend_standby_state_show, NULL); | |
911 | ||
f59c8f9f MB |
912 | static ssize_t regulator_bypass_show(struct device *dev, |
913 | struct device_attribute *attr, char *buf) | |
914 | { | |
915 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
916 | const char *report; | |
917 | bool bypass; | |
918 | int ret; | |
919 | ||
920 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
921 | ||
922 | if (ret != 0) | |
923 | report = "unknown"; | |
924 | else if (bypass) | |
925 | report = "enabled"; | |
926 | else | |
927 | report = "disabled"; | |
928 | ||
929 | return sprintf(buf, "%s\n", report); | |
930 | } | |
931 | static DEVICE_ATTR(bypass, 0444, | |
932 | regulator_bypass_show, NULL); | |
bc558a60 | 933 | |
414c70cb | 934 | /* Calculate the new optimum regulator operating mode based on the new total |
69b8821e SK |
935 | * consumer load. All locks held by caller |
936 | */ | |
8460ef38 | 937 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
938 | { |
939 | struct regulator *sibling; | |
940 | int current_uA = 0, output_uV, input_uV, err; | |
941 | unsigned int mode; | |
942 | ||
8460ef38 BA |
943 | /* |
944 | * first check to see if we can set modes at all, otherwise just | |
945 | * tell the consumer everything is OK. | |
946 | */ | |
74a569ee MG |
947 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
948 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 949 | return 0; |
74a569ee | 950 | } |
8460ef38 | 951 | |
8f4490e0 BA |
952 | if (!rdev->desc->ops->get_optimum_mode && |
953 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
954 | return 0; |
955 | ||
8f4490e0 BA |
956 | if (!rdev->desc->ops->set_mode && |
957 | !rdev->desc->ops->set_load) | |
8460ef38 | 958 | return -EINVAL; |
414c70cb | 959 | |
414c70cb | 960 | /* calc total requested load */ |
5451781d DA |
961 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
962 | if (sibling->enable_count) | |
963 | current_uA += sibling->uA_load; | |
964 | } | |
414c70cb | 965 | |
22a10bca SB |
966 | current_uA += rdev->constraints->system_load; |
967 | ||
8f4490e0 BA |
968 | if (rdev->desc->ops->set_load) { |
969 | /* set the optimum mode for our new total regulator load */ | |
970 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
971 | if (err < 0) | |
61aab5ad MM |
972 | rdev_err(rdev, "failed to set load %d: %pe\n", |
973 | current_uA, ERR_PTR(err)); | |
8f4490e0 | 974 | } else { |
57776617 | 975 | /* get output voltage */ |
d22b85a1 | 976 | output_uV = regulator_get_voltage_rdev(rdev); |
57776617 JP |
977 | if (output_uV <= 0) { |
978 | rdev_err(rdev, "invalid output voltage found\n"); | |
979 | return -EINVAL; | |
980 | } | |
981 | ||
982 | /* get input voltage */ | |
983 | input_uV = 0; | |
984 | if (rdev->supply) | |
985 | input_uV = regulator_get_voltage(rdev->supply); | |
986 | if (input_uV <= 0) | |
987 | input_uV = rdev->constraints->input_uV; | |
988 | if (input_uV <= 0) { | |
989 | rdev_err(rdev, "invalid input voltage found\n"); | |
990 | return -EINVAL; | |
991 | } | |
992 | ||
8f4490e0 BA |
993 | /* now get the optimum mode for our new total regulator load */ |
994 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
995 | output_uV, current_uA); | |
996 | ||
997 | /* check the new mode is allowed */ | |
998 | err = regulator_mode_constrain(rdev, &mode); | |
999 | if (err < 0) { | |
61aab5ad MM |
1000 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n", |
1001 | current_uA, input_uV, output_uV, ERR_PTR(err)); | |
8f4490e0 BA |
1002 | return err; |
1003 | } | |
414c70cb | 1004 | |
8f4490e0 BA |
1005 | err = rdev->desc->ops->set_mode(rdev, mode); |
1006 | if (err < 0) | |
61aab5ad MM |
1007 | rdev_err(rdev, "failed to set optimum mode %x: %pe\n", |
1008 | mode, ERR_PTR(err)); | |
8460ef38 BA |
1009 | } |
1010 | ||
8460ef38 | 1011 | return err; |
414c70cb LG |
1012 | } |
1013 | ||
0955f5be SB |
1014 | static int __suspend_set_state(struct regulator_dev *rdev, |
1015 | const struct regulator_state *rstate) | |
414c70cb LG |
1016 | { |
1017 | int ret = 0; | |
638f85c5 | 1018 | |
72069f99 CZ |
1019 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1020 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1021 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1022 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1023 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1024 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1025 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1026 | ret = 0; | |
1027 | ||
414c70cb | 1028 | if (ret < 0) { |
61aab5ad | 1029 | rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1030 | return ret; |
1031 | } | |
1032 | ||
1033 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1034 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1035 | if (ret < 0) { | |
61aab5ad | 1036 | rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1037 | return ret; |
1038 | } | |
1039 | } | |
1040 | ||
1041 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1042 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1043 | if (ret < 0) { | |
61aab5ad | 1044 | rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret)); |
414c70cb LG |
1045 | return ret; |
1046 | } | |
1047 | } | |
414c70cb | 1048 | |
f7efad10 | 1049 | return ret; |
414c70cb LG |
1050 | } |
1051 | ||
0955f5be SB |
1052 | static int suspend_set_initial_state(struct regulator_dev *rdev) |
1053 | { | |
1054 | const struct regulator_state *rstate; | |
1055 | ||
1056 | rstate = regulator_get_suspend_state_check(rdev, | |
1057 | rdev->constraints->initial_state); | |
1058 | if (!rstate) | |
1059 | return 0; | |
1060 | ||
1061 | return __suspend_set_state(rdev, rstate); | |
1062 | } | |
1063 | ||
c845f21a GU |
1064 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
1065 | static void print_constraints_debug(struct regulator_dev *rdev) | |
414c70cb LG |
1066 | { |
1067 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1068 | char buf[160] = ""; |
5751a99f | 1069 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1070 | int count = 0; |
1071 | int ret; | |
414c70cb | 1072 | |
8f031b48 | 1073 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1074 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1075 | count += scnprintf(buf + count, len - count, "%d mV ", |
1076 | constraints->min_uV / 1000); | |
414c70cb | 1077 | else |
5751a99f SW |
1078 | count += scnprintf(buf + count, len - count, |
1079 | "%d <--> %d mV ", | |
1080 | constraints->min_uV / 1000, | |
1081 | constraints->max_uV / 1000); | |
8f031b48 MB |
1082 | } |
1083 | ||
1084 | if (!constraints->min_uV || | |
1085 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1086 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1087 | if (ret > 0) |
5751a99f SW |
1088 | count += scnprintf(buf + count, len - count, |
1089 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1090 | } |
1091 | ||
bf5892a8 | 1092 | if (constraints->uV_offset) |
5751a99f SW |
1093 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1094 | constraints->uV_offset / 1000); | |
bf5892a8 | 1095 | |
8f031b48 | 1096 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1097 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1098 | count += scnprintf(buf + count, len - count, "%d mA ", |
1099 | constraints->min_uA / 1000); | |
414c70cb | 1100 | else |
5751a99f SW |
1101 | count += scnprintf(buf + count, len - count, |
1102 | "%d <--> %d mA ", | |
1103 | constraints->min_uA / 1000, | |
1104 | constraints->max_uA / 1000); | |
8f031b48 MB |
1105 | } |
1106 | ||
1107 | if (!constraints->min_uA || | |
1108 | constraints->min_uA != constraints->max_uA) { | |
1109 | ret = _regulator_get_current_limit(rdev); | |
1110 | if (ret > 0) | |
5751a99f SW |
1111 | count += scnprintf(buf + count, len - count, |
1112 | "at %d mA ", ret / 1000); | |
414c70cb | 1113 | } |
8f031b48 | 1114 | |
414c70cb | 1115 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1116 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1117 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1118 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1119 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1120 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1121 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
99ad5f6e | 1122 | count += scnprintf(buf + count, len - count, "standby "); |
414c70cb | 1123 | |
215b8b05 | 1124 | if (!count) |
99ad5f6e MM |
1125 | count = scnprintf(buf, len, "no parameters"); |
1126 | else | |
1127 | --count; | |
1128 | ||
1129 | count += scnprintf(buf + count, len - count, ", %s", | |
1130 | _regulator_is_enabled(rdev) ? "enabled" : "disabled"); | |
215b8b05 | 1131 | |
194dbaef | 1132 | rdev_dbg(rdev, "%s\n", buf); |
c845f21a GU |
1133 | } |
1134 | #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1135 | static inline void print_constraints_debug(struct regulator_dev *rdev) {} | |
1136 | #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */ | |
1137 | ||
1138 | static void print_constraints(struct regulator_dev *rdev) | |
1139 | { | |
1140 | struct regulation_constraints *constraints = rdev->constraints; | |
1141 | ||
1142 | print_constraints_debug(rdev); | |
4a682922 MB |
1143 | |
1144 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1145 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1146 | rdev_warn(rdev, |
1147 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1148 | } |
1149 | ||
e79055d6 | 1150 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1151 | struct regulation_constraints *constraints) |
a5766f11 | 1152 | { |
272e2315 | 1153 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1154 | int ret; |
1155 | ||
1156 | /* do we need to apply the constraint voltage */ | |
1157 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1158 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1159 | int target_min, target_max; | |
d22b85a1 | 1160 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1161 | |
1162 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1163 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1164 | rdev_info(rdev, "Setting %d-%duV\n", |
1165 | rdev->constraints->min_uV, | |
1166 | rdev->constraints->max_uV); | |
1167 | _regulator_do_set_voltage(rdev, | |
1168 | rdev->constraints->min_uV, | |
1169 | rdev->constraints->max_uV); | |
d22b85a1 | 1170 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1171 | } |
1172 | ||
064d5cd1 | 1173 | if (current_uV < 0) { |
69d58839 | 1174 | rdev_err(rdev, |
61aab5ad MM |
1175 | "failed to get the current voltage: %pe\n", |
1176 | ERR_PTR(current_uV)); | |
064d5cd1 AB |
1177 | return current_uV; |
1178 | } | |
fa93fd4e MB |
1179 | |
1180 | /* | |
1181 | * If we're below the minimum voltage move up to the | |
1182 | * minimum voltage, if we're above the maximum voltage | |
1183 | * then move down to the maximum. | |
1184 | */ | |
1185 | target_min = current_uV; | |
1186 | target_max = current_uV; | |
1187 | ||
1188 | if (current_uV < rdev->constraints->min_uV) { | |
1189 | target_min = rdev->constraints->min_uV; | |
1190 | target_max = rdev->constraints->min_uV; | |
1191 | } | |
1192 | ||
1193 | if (current_uV > rdev->constraints->max_uV) { | |
1194 | target_min = rdev->constraints->max_uV; | |
1195 | target_max = rdev->constraints->max_uV; | |
1196 | } | |
1197 | ||
1198 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1199 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1200 | current_uV, target_min, target_max); | |
064d5cd1 | 1201 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1202 | rdev, target_min, target_max); |
064d5cd1 AB |
1203 | if (ret < 0) { |
1204 | rdev_err(rdev, | |
61aab5ad MM |
1205 | "failed to apply %d-%duV constraint: %pe\n", |
1206 | target_min, target_max, ERR_PTR(ret)); | |
064d5cd1 AB |
1207 | return ret; |
1208 | } | |
75790251 | 1209 | } |
af5866c9 | 1210 | } |
e06f5b4f | 1211 | |
4367cfdc DB |
1212 | /* constrain machine-level voltage specs to fit |
1213 | * the actual range supported by this regulator. | |
1214 | */ | |
1215 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1216 | int count = rdev->desc->n_voltages; | |
1217 | int i; | |
1218 | int min_uV = INT_MAX; | |
1219 | int max_uV = INT_MIN; | |
1220 | int cmin = constraints->min_uV; | |
1221 | int cmax = constraints->max_uV; | |
1222 | ||
3e590918 | 1223 | /* it's safe to autoconfigure fixed-voltage supplies |
69b8821e SK |
1224 | * and the constraints are used by list_voltage. |
1225 | */ | |
4367cfdc | 1226 | if (count == 1 && !cmin) { |
3e590918 | 1227 | cmin = 1; |
4367cfdc | 1228 | cmax = INT_MAX; |
3e590918 MB |
1229 | constraints->min_uV = cmin; |
1230 | constraints->max_uV = cmax; | |
4367cfdc DB |
1231 | } |
1232 | ||
3e2b9abd MB |
1233 | /* voltage constraints are optional */ |
1234 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1235 | return 0; |
3e2b9abd | 1236 | |
4367cfdc | 1237 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1238 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1239 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1240 | return -EINVAL; |
4367cfdc DB |
1241 | } |
1242 | ||
6d30fc51 CM |
1243 | /* no need to loop voltages if range is continuous */ |
1244 | if (rdev->desc->continuous_voltage_range) | |
1245 | return 0; | |
1246 | ||
4367cfdc DB |
1247 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1248 | for (i = 0; i < count; i++) { | |
1249 | int value; | |
1250 | ||
1251 | value = ops->list_voltage(rdev, i); | |
1252 | if (value <= 0) | |
1253 | continue; | |
1254 | ||
1255 | /* maybe adjust [min_uV..max_uV] */ | |
1256 | if (value >= cmin && value < min_uV) | |
1257 | min_uV = value; | |
1258 | if (value <= cmax && value > max_uV) | |
1259 | max_uV = value; | |
1260 | } | |
1261 | ||
1262 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1263 | if (max_uV < min_uV) { | |
fff15bef MB |
1264 | rdev_err(rdev, |
1265 | "unsupportable voltage constraints %u-%uuV\n", | |
1266 | min_uV, max_uV); | |
e79055d6 | 1267 | return -EINVAL; |
4367cfdc DB |
1268 | } |
1269 | ||
1270 | /* use regulator's subset of machine constraints */ | |
1271 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1272 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1273 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1274 | constraints->min_uV = min_uV; |
1275 | } | |
1276 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1277 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1278 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1279 | constraints->max_uV = max_uV; |
1280 | } | |
1281 | } | |
1282 | ||
e79055d6 MB |
1283 | return 0; |
1284 | } | |
1285 | ||
f8c1700d LD |
1286 | static int machine_constraints_current(struct regulator_dev *rdev, |
1287 | struct regulation_constraints *constraints) | |
1288 | { | |
272e2315 | 1289 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1290 | int ret; |
1291 | ||
1292 | if (!constraints->min_uA && !constraints->max_uA) | |
1293 | return 0; | |
1294 | ||
1295 | if (constraints->min_uA > constraints->max_uA) { | |
1296 | rdev_err(rdev, "Invalid current constraints\n"); | |
1297 | return -EINVAL; | |
1298 | } | |
1299 | ||
1300 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1301 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | /* Set regulator current in constraints range */ | |
1306 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1307 | constraints->max_uA); | |
1308 | if (ret < 0) { | |
1309 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
30c21971 MP |
1316 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1317 | ||
e79055d6 MB |
1318 | /** |
1319 | * set_machine_constraints - sets regulator constraints | |
1320 | * @rdev: regulator source | |
e79055d6 MB |
1321 | * |
1322 | * Allows platform initialisation code to define and constrain | |
1323 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1324 | * Constraints *must* be set by platform code in order for some | |
1325 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1326 | * set_mode. | |
1327 | */ | |
57a6ad48 | 1328 | static int set_machine_constraints(struct regulator_dev *rdev) |
e79055d6 MB |
1329 | { |
1330 | int ret = 0; | |
272e2315 | 1331 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1332 | |
f8c12fe3 | 1333 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1334 | if (ret != 0) |
6333ef46 | 1335 | return ret; |
e79055d6 | 1336 | |
f8c1700d | 1337 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1338 | if (ret != 0) |
6333ef46 | 1339 | return ret; |
e79055d6 | 1340 | |
36e4f839 SB |
1341 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1342 | ret = ops->set_input_current_limit(rdev, | |
1343 | rdev->constraints->ilim_uA); | |
1344 | if (ret < 0) { | |
61aab5ad | 1345 | rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1346 | return ret; |
36e4f839 SB |
1347 | } |
1348 | } | |
1349 | ||
a5766f11 | 1350 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1351 | if (rdev->constraints->initial_state) { |
0955f5be | 1352 | ret = suspend_set_initial_state(rdev); |
e06f5b4f | 1353 | if (ret < 0) { |
61aab5ad | 1354 | rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1355 | return ret; |
e06f5b4f MB |
1356 | } |
1357 | } | |
a5766f11 | 1358 | |
9a8f5e07 | 1359 | if (rdev->constraints->initial_mode) { |
a308466c | 1360 | if (!ops->set_mode) { |
5da84fd9 | 1361 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1362 | return -EINVAL; |
a308466c MB |
1363 | } |
1364 | ||
f8c12fe3 | 1365 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1366 | if (ret < 0) { |
61aab5ad | 1367 | rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1368 | return ret; |
a308466c | 1369 | } |
fa94e48e DA |
1370 | } else if (rdev->constraints->system_load) { |
1371 | /* | |
1372 | * We'll only apply the initial system load if an | |
1373 | * initial mode wasn't specified. | |
1374 | */ | |
1375 | drms_uA_update(rdev); | |
a308466c MB |
1376 | } |
1377 | ||
1653ccf4 YSB |
1378 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1379 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1380 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1381 | if (ret < 0) { | |
61aab5ad | 1382 | rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1383 | return ret; |
6f0b2c69 YSB |
1384 | } |
1385 | } | |
1386 | ||
23c779b9 SB |
1387 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1388 | ret = ops->set_pull_down(rdev); | |
1389 | if (ret < 0) { | |
61aab5ad | 1390 | rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1391 | return ret; |
23c779b9 SB |
1392 | } |
1393 | } | |
1394 | ||
57f66b78 SB |
1395 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1396 | ret = ops->set_soft_start(rdev); | |
1397 | if (ret < 0) { | |
61aab5ad | 1398 | rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret)); |
6333ef46 | 1399 | return ret; |
57f66b78 SB |
1400 | } |
1401 | } | |
1402 | ||
3a003bae SB |
1403 | if (rdev->constraints->over_current_protection |
1404 | && ops->set_over_current_protection) { | |
1405 | ret = ops->set_over_current_protection(rdev); | |
1406 | if (ret < 0) { | |
61aab5ad MM |
1407 | rdev_err(rdev, "failed to set over current protection: %pe\n", |
1408 | ERR_PTR(ret)); | |
6333ef46 | 1409 | return ret; |
3a003bae SB |
1410 | } |
1411 | } | |
1412 | ||
670666b9 LD |
1413 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1414 | bool ad_state = (rdev->constraints->active_discharge == | |
1415 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1416 | ||
1417 | ret = ops->set_active_discharge(rdev, ad_state); | |
1418 | if (ret < 0) { | |
61aab5ad | 1419 | rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret)); |
670666b9 LD |
1420 | return ret; |
1421 | } | |
1422 | } | |
1423 | ||
2bb16663 OS |
1424 | /* If the constraints say the regulator should be on at this point |
1425 | * and we have control then make sure it is enabled. | |
1426 | */ | |
1427 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
05f224ca DA |
1428 | if (rdev->supply) { |
1429 | ret = regulator_enable(rdev->supply); | |
1430 | if (ret < 0) { | |
1431 | _regulator_put(rdev->supply); | |
1432 | rdev->supply = NULL; | |
1433 | return ret; | |
1434 | } | |
1435 | } | |
1436 | ||
2bb16663 OS |
1437 | ret = _regulator_do_enable(rdev); |
1438 | if (ret < 0 && ret != -EINVAL) { | |
61aab5ad | 1439 | rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret)); |
2bb16663 OS |
1440 | return ret; |
1441 | } | |
089b3f61 PP |
1442 | |
1443 | if (rdev->constraints->always_on) | |
1444 | rdev->use_count++; | |
2bb16663 OS |
1445 | } |
1446 | ||
a5766f11 | 1447 | print_constraints(rdev); |
1a6958e7 | 1448 | return 0; |
a5766f11 LG |
1449 | } |
1450 | ||
1451 | /** | |
1452 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1453 | * @rdev: regulator name |
1454 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1455 | * |
1456 | * Called by platform initialisation code to set the supply regulator for this | |
1457 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1458 | * core if it's child is enabled. | |
1459 | */ | |
1460 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1461 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1462 | { |
1463 | int err; | |
1464 | ||
3801b86a MB |
1465 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1466 | ||
e2c09ae7 JMC |
1467 | if (!try_module_get(supply_rdev->owner)) |
1468 | return -ENODEV; | |
1469 | ||
3801b86a | 1470 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1471 | if (rdev->supply == NULL) { |
1472 | err = -ENOMEM; | |
3801b86a | 1473 | return err; |
a5766f11 | 1474 | } |
57ad526a | 1475 | supply_rdev->open_count++; |
3801b86a MB |
1476 | |
1477 | return 0; | |
a5766f11 LG |
1478 | } |
1479 | ||
1480 | /** | |
06c63f93 | 1481 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1482 | * @rdev: regulator source |
40f9244f | 1483 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1484 | * @supply: symbolic name for supply |
a5766f11 LG |
1485 | * |
1486 | * Allows platform initialisation code to map physical regulator | |
1487 | * sources to symbolic names for supplies for use by devices. Devices | |
1488 | * should use these symbolic names to request regulators, avoiding the | |
1489 | * need to provide board-specific regulator names as platform data. | |
1490 | */ | |
1491 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1492 | const char *consumer_dev_name, |
1493 | const char *supply) | |
a5766f11 | 1494 | { |
5c065401 | 1495 | struct regulator_map *node, *new_node; |
9ed2099e | 1496 | int has_dev; |
a5766f11 LG |
1497 | |
1498 | if (supply == NULL) | |
1499 | return -EINVAL; | |
1500 | ||
9ed2099e MB |
1501 | if (consumer_dev_name != NULL) |
1502 | has_dev = 1; | |
1503 | else | |
1504 | has_dev = 0; | |
1505 | ||
5c065401 MM |
1506 | new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
1507 | if (new_node == NULL) | |
1508 | return -ENOMEM; | |
1509 | ||
1510 | new_node->regulator = rdev; | |
1511 | new_node->supply = supply; | |
1512 | ||
1513 | if (has_dev) { | |
1514 | new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1515 | if (new_node->dev_name == NULL) { | |
1516 | kfree(new_node); | |
1517 | return -ENOMEM; | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | mutex_lock(®ulator_list_mutex); | |
6001e13c | 1522 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1523 | if (node->dev_name && consumer_dev_name) { |
1524 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1525 | continue; | |
1526 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1527 | continue; |
23b5cc2a JN |
1528 | } |
1529 | ||
6001e13c DB |
1530 | if (strcmp(node->supply, supply) != 0) |
1531 | continue; | |
1532 | ||
737f360d MB |
1533 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1534 | consumer_dev_name, | |
1535 | dev_name(&node->regulator->dev), | |
1536 | node->regulator->desc->name, | |
1537 | supply, | |
1538 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
5c065401 | 1539 | goto fail; |
6001e13c DB |
1540 | } |
1541 | ||
5c065401 MM |
1542 | list_add(&new_node->list, ®ulator_map_list); |
1543 | mutex_unlock(®ulator_list_mutex); | |
40f9244f | 1544 | |
a5766f11 | 1545 | return 0; |
5c065401 MM |
1546 | |
1547 | fail: | |
1548 | mutex_unlock(®ulator_list_mutex); | |
1549 | kfree(new_node->dev_name); | |
1550 | kfree(new_node); | |
1551 | return -EBUSY; | |
a5766f11 LG |
1552 | } |
1553 | ||
0f1d747b MR |
1554 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1555 | { | |
1556 | struct regulator_map *node, *n; | |
1557 | ||
1558 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1559 | if (rdev == node->regulator) { | |
1560 | list_del(&node->list); | |
40f9244f | 1561 | kfree(node->dev_name); |
0f1d747b | 1562 | kfree(node); |
0f1d747b MR |
1563 | } |
1564 | } | |
1565 | } | |
1566 | ||
2d80a91b RF |
1567 | #ifdef CONFIG_DEBUG_FS |
1568 | static ssize_t constraint_flags_read_file(struct file *file, | |
1569 | char __user *user_buf, | |
1570 | size_t count, loff_t *ppos) | |
1571 | { | |
1572 | const struct regulator *regulator = file->private_data; | |
1573 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1574 | char *buf; | |
1575 | ssize_t ret; | |
1576 | ||
1577 | if (!c) | |
1578 | return 0; | |
1579 | ||
1580 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1581 | if (!buf) | |
1582 | return -ENOMEM; | |
1583 | ||
1584 | ret = snprintf(buf, PAGE_SIZE, | |
1585 | "always_on: %u\n" | |
1586 | "boot_on: %u\n" | |
1587 | "apply_uV: %u\n" | |
1588 | "ramp_disable: %u\n" | |
1589 | "soft_start: %u\n" | |
1590 | "pull_down: %u\n" | |
1591 | "over_current_protection: %u\n", | |
1592 | c->always_on, | |
1593 | c->boot_on, | |
1594 | c->apply_uV, | |
1595 | c->ramp_disable, | |
1596 | c->soft_start, | |
1597 | c->pull_down, | |
1598 | c->over_current_protection); | |
1599 | ||
1600 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1601 | kfree(buf); | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | ||
1606 | #endif | |
1607 | ||
1608 | static const struct file_operations constraint_flags_fops = { | |
1609 | #ifdef CONFIG_DEBUG_FS | |
1610 | .open = simple_open, | |
1611 | .read = constraint_flags_read_file, | |
1612 | .llseek = default_llseek, | |
1613 | #endif | |
1614 | }; | |
1615 | ||
f5726ae3 | 1616 | #define REG_STR_SIZE 64 |
414c70cb LG |
1617 | |
1618 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1619 | struct device *dev, | |
1620 | const char *supply_name) | |
1621 | { | |
1622 | struct regulator *regulator; | |
dbe954d8 | 1623 | int err = 0; |
87fe29b6 MM |
1624 | |
1625 | if (dev) { | |
1626 | char buf[REG_STR_SIZE]; | |
1627 | int size; | |
1628 | ||
1629 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", | |
1630 | dev->kobj.name, supply_name); | |
1631 | if (size >= REG_STR_SIZE) | |
1632 | return NULL; | |
1633 | ||
1634 | supply_name = kstrdup(buf, GFP_KERNEL); | |
1635 | if (supply_name == NULL) | |
1636 | return NULL; | |
1637 | } else { | |
1638 | supply_name = kstrdup_const(supply_name, GFP_KERNEL); | |
1639 | if (supply_name == NULL) | |
1640 | return NULL; | |
1641 | } | |
414c70cb LG |
1642 | |
1643 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
87fe29b6 MM |
1644 | if (regulator == NULL) { |
1645 | kfree(supply_name); | |
414c70cb | 1646 | return NULL; |
87fe29b6 | 1647 | } |
414c70cb | 1648 | |
414c70cb | 1649 | regulator->rdev = rdev; |
87fe29b6 MM |
1650 | regulator->supply_name = supply_name; |
1651 | ||
1652 | regulator_lock(rdev); | |
414c70cb | 1653 | list_add(®ulator->list, &rdev->consumer_list); |
87fe29b6 | 1654 | regulator_unlock(rdev); |
414c70cb LG |
1655 | |
1656 | if (dev) { | |
e2c98eaf SG |
1657 | regulator->dev = dev; |
1658 | ||
222cc7b1 | 1659 | /* Add a link to the device sysfs entry */ |
ff268b56 | 1660 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
87fe29b6 | 1661 | supply_name); |
414c70cb | 1662 | if (err) { |
61aab5ad MM |
1663 | rdev_dbg(rdev, "could not add device link %s: %pe\n", |
1664 | dev->kobj.name, ERR_PTR(err)); | |
222cc7b1 | 1665 | /* non-fatal */ |
414c70cb | 1666 | } |
5de70519 MB |
1667 | } |
1668 | ||
dbe954d8 HG |
1669 | if (err != -EEXIST) |
1670 | regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); | |
24751434 | 1671 | if (!regulator->debugfs) { |
ad3a942b | 1672 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1673 | } else { |
1674 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1675 | ®ulator->uA_load); | |
1676 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1677 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1678 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1679 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1680 | debugfs_create_file("constraint_flags", 0444, |
1681 | regulator->debugfs, regulator, | |
1682 | &constraint_flags_fops); | |
414c70cb | 1683 | } |
5de70519 | 1684 | |
6492bc1b MB |
1685 | /* |
1686 | * Check now if the regulator is an always on regulator - if | |
1687 | * it is then we don't need to do nearly so much work for | |
1688 | * enable/disable calls. | |
1689 | */ | |
8a34e979 | 1690 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1691 | _regulator_is_enabled(rdev)) |
1692 | regulator->always_on = true; | |
1693 | ||
414c70cb | 1694 | return regulator; |
414c70cb LG |
1695 | } |
1696 | ||
31aae2be MB |
1697 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1698 | { | |
00c877c6 LD |
1699 | if (rdev->constraints && rdev->constraints->enable_time) |
1700 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1701 | if (rdev->desc->ops->enable_time) |
1702 | return rdev->desc->ops->enable_time(rdev); | |
1703 | return rdev->desc->enable_time; | |
31aae2be MB |
1704 | } |
1705 | ||
a06ccd9c CK |
1706 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1707 | struct device *dev, const char *supply) | |
1708 | { | |
1709 | struct regulator_supply_alias *map; | |
1710 | ||
1711 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1712 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1713 | return map; | |
1714 | ||
1715 | return NULL; | |
1716 | } | |
1717 | ||
1718 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1719 | { | |
1720 | struct regulator_supply_alias *map; | |
1721 | ||
1722 | map = regulator_find_supply_alias(*dev, *supply); | |
1723 | if (map) { | |
1724 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1725 | *supply, map->alias_supply, | |
1726 | dev_name(map->alias_dev)); | |
1727 | *dev = map->alias_dev; | |
1728 | *supply = map->alias_supply; | |
1729 | } | |
1730 | } | |
1731 | ||
85f3b431 TV |
1732 | static int regulator_match(struct device *dev, const void *data) |
1733 | { | |
1734 | struct regulator_dev *r = dev_to_rdev(dev); | |
1735 | ||
1736 | return strcmp(rdev_get_name(r), data) == 0; | |
1737 | } | |
1738 | ||
1739 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1740 | { | |
1741 | struct device *dev; | |
1742 | ||
1743 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1744 | ||
1745 | return dev ? dev_to_rdev(dev) : NULL; | |
1746 | } | |
1747 | ||
1748 | /** | |
1749 | * regulator_dev_lookup - lookup a regulator device. | |
1750 | * @dev: device for regulator "consumer". | |
1751 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1752 | * |
1753 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1754 | * @supply and with the embedded struct device refcount incremented by one. |
1755 | * The refcount must be dropped by calling put_device(). | |
1756 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1757 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1758 | * in the future. | |
85f3b431 | 1759 | */ |
69511a45 | 1760 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1761 | const char *supply) |
69511a45 | 1762 | { |
06217197 | 1763 | struct regulator_dev *r = NULL; |
69511a45 | 1764 | struct device_node *node; |
576ca436 MB |
1765 | struct regulator_map *map; |
1766 | const char *devname = NULL; | |
69511a45 | 1767 | |
a06ccd9c CK |
1768 | regulator_supply_alias(&dev, &supply); |
1769 | ||
69511a45 RN |
1770 | /* first do a dt based lookup */ |
1771 | if (dev && dev->of_node) { | |
1772 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1773 | if (node) { |
85f3b431 TV |
1774 | r = of_find_regulator_by_node(node); |
1775 | if (r) | |
1776 | return r; | |
163478da | 1777 | |
6d191a5f | 1778 | /* |
163478da DT |
1779 | * We have a node, but there is no device. |
1780 | * assume it has not registered yet. | |
6d191a5f | 1781 | */ |
163478da | 1782 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1783 | } |
69511a45 RN |
1784 | } |
1785 | ||
1786 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1787 | if (dev) |
1788 | devname = dev_name(dev); | |
1789 | ||
85f3b431 | 1790 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1791 | list_for_each_entry(map, ®ulator_map_list, list) { |
1792 | /* If the mapping has a device set up it must match */ | |
1793 | if (map->dev_name && | |
1794 | (!devname || strcmp(map->dev_name, devname))) | |
1795 | continue; | |
1796 | ||
85f3b431 TV |
1797 | if (strcmp(map->supply, supply) == 0 && |
1798 | get_device(&map->regulator->dev)) { | |
163478da DT |
1799 | r = map->regulator; |
1800 | break; | |
85f3b431 | 1801 | } |
576ca436 | 1802 | } |
85f3b431 | 1803 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1804 | |
06217197 CK |
1805 | if (r) |
1806 | return r; | |
1807 | ||
1808 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1809 | if (r) |
1810 | return r; | |
1811 | ||
1812 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1813 | } |
1814 | ||
6261b06d BA |
1815 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1816 | { | |
1817 | struct regulator_dev *r; | |
1818 | struct device *dev = rdev->dev.parent; | |
eaa7995c | 1819 | int ret = 0; |
6261b06d | 1820 | |
48f1b4ef | 1821 | /* No supply to resolve? */ |
6261b06d BA |
1822 | if (!rdev->supply_name) |
1823 | return 0; | |
1824 | ||
eaa7995c | 1825 | /* Supply already resolved? (fast-path without locking contention) */ |
6261b06d BA |
1826 | if (rdev->supply) |
1827 | return 0; | |
1828 | ||
163478da DT |
1829 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1830 | if (IS_ERR(r)) { | |
1831 | ret = PTR_ERR(r); | |
1832 | ||
06423121 MB |
1833 | /* Did the lookup explicitly defer for us? */ |
1834 | if (ret == -EPROBE_DEFER) | |
eaa7995c | 1835 | goto out; |
06423121 | 1836 | |
9f7e25ed MB |
1837 | if (have_full_constraints()) { |
1838 | r = dummy_regulator_rdev; | |
85f3b431 | 1839 | get_device(&r->dev); |
9f7e25ed MB |
1840 | } else { |
1841 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1842 | rdev->supply_name, rdev->desc->name); | |
eaa7995c DC |
1843 | ret = -EPROBE_DEFER; |
1844 | goto out; | |
9f7e25ed | 1845 | } |
6261b06d BA |
1846 | } |
1847 | ||
4b639e25 MM |
1848 | if (r == rdev) { |
1849 | dev_err(dev, "Supply for %s (%s) resolved to itself\n", | |
1850 | rdev->desc->name, rdev->supply_name); | |
eaa7995c DC |
1851 | if (!have_full_constraints()) { |
1852 | ret = -EINVAL; | |
1853 | goto out; | |
1854 | } | |
f5c042b2 MM |
1855 | r = dummy_regulator_rdev; |
1856 | get_device(&r->dev); | |
4b639e25 MM |
1857 | } |
1858 | ||
66d228a2 JH |
1859 | /* |
1860 | * If the supply's parent device is not the same as the | |
1861 | * regulator's parent device, then ensure the parent device | |
1862 | * is bound before we resolve the supply, in case the parent | |
1863 | * device get probe deferred and unregisters the supply. | |
1864 | */ | |
1865 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1866 | if (!device_is_bound(r->dev.parent)) { | |
1867 | put_device(&r->dev); | |
eaa7995c DC |
1868 | ret = -EPROBE_DEFER; |
1869 | goto out; | |
66d228a2 JH |
1870 | } |
1871 | } | |
1872 | ||
6261b06d BA |
1873 | /* Recursively resolve the supply of the supply */ |
1874 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1875 | if (ret < 0) { |
1876 | put_device(&r->dev); | |
eaa7995c | 1877 | goto out; |
85f3b431 | 1878 | } |
6261b06d | 1879 | |
14a71d50 MB |
1880 | /* |
1881 | * Recheck rdev->supply with rdev->mutex lock held to avoid a race | |
1882 | * between rdev->supply null check and setting rdev->supply in | |
1883 | * set_supply() from concurrent tasks. | |
1884 | */ | |
1885 | regulator_lock(rdev); | |
1886 | ||
1887 | /* Supply just resolved by a concurrent task? */ | |
1888 | if (rdev->supply) { | |
1889 | regulator_unlock(rdev); | |
1890 | put_device(&r->dev); | |
1891 | goto out; | |
1892 | } | |
1893 | ||
6261b06d | 1894 | ret = set_supply(rdev, r); |
85f3b431 | 1895 | if (ret < 0) { |
14a71d50 | 1896 | regulator_unlock(rdev); |
85f3b431 | 1897 | put_device(&r->dev); |
eaa7995c | 1898 | goto out; |
85f3b431 | 1899 | } |
6261b06d | 1900 | |
14a71d50 MB |
1901 | regulator_unlock(rdev); |
1902 | ||
05f224ca DA |
1903 | /* |
1904 | * In set_machine_constraints() we may have turned this regulator on | |
1905 | * but we couldn't propagate to the supply if it hadn't been resolved | |
1906 | * yet. Do it now. | |
1907 | */ | |
1908 | if (rdev->use_count) { | |
6261b06d | 1909 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1910 | if (ret < 0) { |
9f8df6ad | 1911 | _regulator_put(rdev->supply); |
8e5356a7 | 1912 | rdev->supply = NULL; |
eaa7995c | 1913 | goto out; |
36a1f1b6 | 1914 | } |
6261b06d BA |
1915 | } |
1916 | ||
eaa7995c | 1917 | out: |
eaa7995c | 1918 | return ret; |
6261b06d BA |
1919 | } |
1920 | ||
5ffbd136 | 1921 | /* Internal regulator request function */ |
a8bd42a9 DT |
1922 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1923 | enum regulator_get_type get_type) | |
414c70cb LG |
1924 | { |
1925 | struct regulator_dev *rdev; | |
7d245afa | 1926 | struct regulator *regulator; |
b59b6544 | 1927 | struct device_link *link; |
317b5684 | 1928 | int ret; |
414c70cb | 1929 | |
a8bd42a9 DT |
1930 | if (get_type >= MAX_GET_TYPE) { |
1931 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1932 | return ERR_PTR(-EINVAL); | |
1933 | } | |
1934 | ||
414c70cb | 1935 | if (id == NULL) { |
5da84fd9 | 1936 | pr_err("get() with no identifier\n"); |
043c998f | 1937 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1938 | } |
1939 | ||
163478da | 1940 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1941 | if (IS_ERR(rdev)) { |
1942 | ret = PTR_ERR(rdev); | |
1e4b545c | 1943 | |
a4d7641f DT |
1944 | /* |
1945 | * If regulator_dev_lookup() fails with error other | |
1946 | * than -ENODEV our job here is done, we simply return it. | |
1947 | */ | |
1948 | if (ret != -ENODEV) | |
1949 | return ERR_PTR(ret); | |
34abbd68 | 1950 | |
a4d7641f DT |
1951 | if (!have_full_constraints()) { |
1952 | dev_warn(dev, | |
1953 | "incomplete constraints, dummy supplies not allowed\n"); | |
1954 | return ERR_PTR(-ENODEV); | |
1955 | } | |
4ddfebd3 | 1956 | |
a4d7641f DT |
1957 | switch (get_type) { |
1958 | case NORMAL_GET: | |
1959 | /* | |
1960 | * Assume that a regulator is physically present and | |
1961 | * enabled, even if it isn't hooked up, and just | |
1962 | * provide a dummy. | |
1963 | */ | |
6e5505cf | 1964 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
1965 | rdev = dummy_regulator_rdev; |
1966 | get_device(&rdev->dev); | |
1967 | break; | |
34abbd68 | 1968 | |
a4d7641f DT |
1969 | case EXCLUSIVE_GET: |
1970 | dev_warn(dev, | |
1971 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 1972 | fallthrough; |
34abbd68 | 1973 | |
a4d7641f DT |
1974 | default: |
1975 | return ERR_PTR(-ENODEV); | |
1976 | } | |
34abbd68 | 1977 | } |
34abbd68 | 1978 | |
5ffbd136 MB |
1979 | if (rdev->exclusive) { |
1980 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1981 | put_device(&rdev->dev); |
1982 | return regulator; | |
5ffbd136 MB |
1983 | } |
1984 | ||
a8bd42a9 | 1985 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1986 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1987 | put_device(&rdev->dev); |
1988 | return regulator; | |
5ffbd136 MB |
1989 | } |
1990 | ||
79d6f049 DO |
1991 | mutex_lock(®ulator_list_mutex); |
1992 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1993 | mutex_unlock(®ulator_list_mutex); | |
1994 | ||
1995 | if (ret != 0) { | |
1996 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1997 | put_device(&rdev->dev); | |
1998 | return regulator; | |
1999 | } | |
2000 | ||
6261b06d BA |
2001 | ret = regulator_resolve_supply(rdev); |
2002 | if (ret < 0) { | |
2003 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
2004 | put_device(&rdev->dev); |
2005 | return regulator; | |
6261b06d BA |
2006 | } |
2007 | ||
85f3b431 | 2008 | if (!try_module_get(rdev->owner)) { |
7d245afa | 2009 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
2010 | put_device(&rdev->dev); |
2011 | return regulator; | |
2012 | } | |
a5766f11 | 2013 | |
414c70cb LG |
2014 | regulator = create_regulator(rdev, dev, id); |
2015 | if (regulator == NULL) { | |
2016 | regulator = ERR_PTR(-ENOMEM); | |
2017 | module_put(rdev->owner); | |
4affd79a | 2018 | put_device(&rdev->dev); |
85f3b431 | 2019 | return regulator; |
414c70cb LG |
2020 | } |
2021 | ||
5ffbd136 | 2022 | rdev->open_count++; |
a8bd42a9 | 2023 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
2024 | rdev->exclusive = 1; |
2025 | ||
2026 | ret = _regulator_is_enabled(rdev); | |
2027 | if (ret > 0) | |
2028 | rdev->use_count = 1; | |
2029 | else | |
2030 | rdev->use_count = 0; | |
2031 | } | |
2032 | ||
b59b6544 SK |
2033 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
2034 | if (!IS_ERR_OR_NULL(link)) | |
2035 | regulator->device_link = true; | |
ed1ae2dd | 2036 | |
414c70cb LG |
2037 | return regulator; |
2038 | } | |
5ffbd136 MB |
2039 | |
2040 | /** | |
2041 | * regulator_get - lookup and obtain a reference to a regulator. | |
2042 | * @dev: device for regulator "consumer" | |
2043 | * @id: Supply name or regulator ID. | |
2044 | * | |
2045 | * Returns a struct regulator corresponding to the regulator producer, | |
2046 | * or IS_ERR() condition containing errno. | |
2047 | * | |
90cf443d | 2048 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2049 | * strongly encouraged. It is recommended that the supply name used |
2050 | * should match the name used for the supply and/or the relevant | |
2051 | * device pins in the datasheet. | |
2052 | */ | |
2053 | struct regulator *regulator_get(struct device *dev, const char *id) | |
2054 | { | |
a8bd42a9 | 2055 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 2056 | } |
414c70cb LG |
2057 | EXPORT_SYMBOL_GPL(regulator_get); |
2058 | ||
5ffbd136 MB |
2059 | /** |
2060 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
2061 | * @dev: device for regulator "consumer" | |
2062 | * @id: Supply name or regulator ID. | |
2063 | * | |
2064 | * Returns a struct regulator corresponding to the regulator producer, | |
2065 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
2066 | * unable to obtain this regulator while this reference is held and the |
2067 | * use count for the regulator will be initialised to reflect the current | |
2068 | * state of the regulator. | |
5ffbd136 MB |
2069 | * |
2070 | * This is intended for use by consumers which cannot tolerate shared | |
2071 | * use of the regulator such as those which need to force the | |
2072 | * regulator off for correct operation of the hardware they are | |
2073 | * controlling. | |
2074 | * | |
90cf443d | 2075 | * Use of supply names configured via set_consumer_device_supply() is |
5ffbd136 MB |
2076 | * strongly encouraged. It is recommended that the supply name used |
2077 | * should match the name used for the supply and/or the relevant | |
2078 | * device pins in the datasheet. | |
2079 | */ | |
2080 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2081 | { | |
a8bd42a9 | 2082 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2083 | } |
2084 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2085 | ||
de1dd9fd MB |
2086 | /** |
2087 | * regulator_get_optional - obtain optional access to a regulator. | |
2088 | * @dev: device for regulator "consumer" | |
2089 | * @id: Supply name or regulator ID. | |
2090 | * | |
2091 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2092 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2093 | * |
2094 | * This is intended for use by consumers for devices which can have | |
2095 | * some supplies unconnected in normal use, such as some MMC devices. | |
2096 | * It can allow the regulator core to provide stub supplies for other | |
2097 | * supplies requested using normal regulator_get() calls without | |
2098 | * disrupting the operation of drivers that can handle absent | |
2099 | * supplies. | |
2100 | * | |
90cf443d | 2101 | * Use of supply names configured via set_consumer_device_supply() is |
de1dd9fd MB |
2102 | * strongly encouraged. It is recommended that the supply name used |
2103 | * should match the name used for the supply and/or the relevant | |
2104 | * device pins in the datasheet. | |
2105 | */ | |
2106 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2107 | { | |
a8bd42a9 | 2108 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2109 | } |
2110 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2111 | ||
e1794aa4 | 2112 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2113 | { |
e1794aa4 | 2114 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2115 | |
5de70519 | 2116 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2117 | |
ed1ae2dd | 2118 | if (regulator->dev) { |
b59b6544 SK |
2119 | if (regulator->device_link) |
2120 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2121 | |
2122 | /* remove any sysfs entries */ | |
414c70cb | 2123 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2124 | } |
2125 | ||
66cf9a7e | 2126 | regulator_lock(rdev); |
414c70cb | 2127 | list_del(®ulator->list); |
414c70cb | 2128 | |
5ffbd136 MB |
2129 | rdev->open_count--; |
2130 | rdev->exclusive = 0; | |
66cf9a7e | 2131 | regulator_unlock(rdev); |
5ffbd136 | 2132 | |
0630b614 | 2133 | kfree_const(regulator->supply_name); |
1768514e | 2134 | kfree(regulator); |
e1794aa4 SK |
2135 | } |
2136 | ||
2137 | /* regulator_list_mutex lock held by regulator_put() */ | |
2138 | static void _regulator_put(struct regulator *regulator) | |
2139 | { | |
2140 | struct regulator_dev *rdev; | |
2141 | ||
2142 | if (IS_ERR_OR_NULL(regulator)) | |
2143 | return; | |
2144 | ||
2145 | lockdep_assert_held_once(®ulator_list_mutex); | |
2146 | ||
2147 | /* Docs say you must disable before calling regulator_put() */ | |
2148 | WARN_ON(regulator->enable_count); | |
2149 | ||
2150 | rdev = regulator->rdev; | |
2151 | ||
2152 | destroy_regulator(regulator); | |
1768514e | 2153 | |
414c70cb | 2154 | module_put(rdev->owner); |
4affd79a | 2155 | put_device(&rdev->dev); |
23ff2f0f CK |
2156 | } |
2157 | ||
2158 | /** | |
2159 | * regulator_put - "free" the regulator source | |
2160 | * @regulator: regulator source | |
2161 | * | |
2162 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2163 | * regulator source are balanced by regulator_disable calls prior to calling | |
2164 | * this function. | |
2165 | */ | |
2166 | void regulator_put(struct regulator *regulator) | |
2167 | { | |
2168 | mutex_lock(®ulator_list_mutex); | |
2169 | _regulator_put(regulator); | |
414c70cb LG |
2170 | mutex_unlock(®ulator_list_mutex); |
2171 | } | |
2172 | EXPORT_SYMBOL_GPL(regulator_put); | |
2173 | ||
a06ccd9c CK |
2174 | /** |
2175 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2176 | * | |
2177 | * @dev: device that will be given as the regulator "consumer" | |
2178 | * @id: Supply name or regulator ID | |
2179 | * @alias_dev: device that should be used to lookup the supply | |
2180 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2181 | * supply | |
2182 | * | |
2183 | * All lookups for id on dev will instead be conducted for alias_id on | |
2184 | * alias_dev. | |
2185 | */ | |
2186 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2187 | struct device *alias_dev, | |
2188 | const char *alias_id) | |
2189 | { | |
2190 | struct regulator_supply_alias *map; | |
2191 | ||
2192 | map = regulator_find_supply_alias(dev, id); | |
2193 | if (map) | |
2194 | return -EEXIST; | |
2195 | ||
2196 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2197 | if (!map) | |
2198 | return -ENOMEM; | |
2199 | ||
2200 | map->src_dev = dev; | |
2201 | map->src_supply = id; | |
2202 | map->alias_dev = alias_dev; | |
2203 | map->alias_supply = alias_id; | |
2204 | ||
2205 | list_add(&map->list, ®ulator_supply_alias_list); | |
2206 | ||
2207 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2208 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2209 | ||
2210 | return 0; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2213 | ||
2214 | /** | |
2215 | * regulator_unregister_supply_alias - Remove device alias | |
2216 | * | |
2217 | * @dev: device that will be given as the regulator "consumer" | |
2218 | * @id: Supply name or regulator ID | |
2219 | * | |
2220 | * Remove a lookup alias if one exists for id on dev. | |
2221 | */ | |
2222 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2223 | { | |
2224 | struct regulator_supply_alias *map; | |
2225 | ||
2226 | map = regulator_find_supply_alias(dev, id); | |
2227 | if (map) { | |
2228 | list_del(&map->list); | |
2229 | kfree(map); | |
2230 | } | |
2231 | } | |
2232 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2233 | ||
2234 | /** | |
2235 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2236 | * | |
2237 | * @dev: device that will be given as the regulator "consumer" | |
2238 | * @id: List of supply names or regulator IDs | |
2239 | * @alias_dev: device that should be used to lookup the supply | |
2240 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2241 | * lookup the supply | |
2242 | * @num_id: Number of aliases to register | |
2243 | * | |
2244 | * @return 0 on success, an errno on failure. | |
2245 | * | |
2246 | * This helper function allows drivers to register several supply | |
2247 | * aliases in one operation. If any of the aliases cannot be | |
2248 | * registered any aliases that were registered will be removed | |
2249 | * before returning to the caller. | |
2250 | */ | |
9f8c0fe9 LJ |
2251 | int regulator_bulk_register_supply_alias(struct device *dev, |
2252 | const char *const *id, | |
a06ccd9c | 2253 | struct device *alias_dev, |
9f8c0fe9 | 2254 | const char *const *alias_id, |
a06ccd9c CK |
2255 | int num_id) |
2256 | { | |
2257 | int i; | |
2258 | int ret; | |
2259 | ||
2260 | for (i = 0; i < num_id; ++i) { | |
2261 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2262 | alias_id[i]); | |
2263 | if (ret < 0) | |
2264 | goto err; | |
2265 | } | |
2266 | ||
2267 | return 0; | |
2268 | ||
2269 | err: | |
2270 | dev_err(dev, | |
2271 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2272 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2273 | ||
2274 | while (--i >= 0) | |
2275 | regulator_unregister_supply_alias(dev, id[i]); | |
2276 | ||
2277 | return ret; | |
2278 | } | |
2279 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2280 | ||
2281 | /** | |
2282 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2283 | * | |
2284 | * @dev: device that will be given as the regulator "consumer" | |
2285 | * @id: List of supply names or regulator IDs | |
2286 | * @num_id: Number of aliases to unregister | |
2287 | * | |
2288 | * This helper function allows drivers to unregister several supply | |
2289 | * aliases in one operation. | |
2290 | */ | |
2291 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2292 | const char *const *id, |
a06ccd9c CK |
2293 | int num_id) |
2294 | { | |
2295 | int i; | |
2296 | ||
2297 | for (i = 0; i < num_id; ++i) | |
2298 | regulator_unregister_supply_alias(dev, id[i]); | |
2299 | } | |
2300 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2301 | ||
2302 | ||
f19b00da KM |
2303 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2304 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2305 | const struct regulator_config *config) | |
2306 | { | |
467bf301 | 2307 | struct regulator_enable_gpio *pin, *new_pin; |
778b28b4 | 2308 | struct gpio_desc *gpiod; |
f19b00da | 2309 | |
541d052d | 2310 | gpiod = config->ena_gpiod; |
467bf301 MM |
2311 | new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL); |
2312 | ||
2313 | mutex_lock(®ulator_list_mutex); | |
778b28b4 | 2314 | |
f19b00da | 2315 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2316 | if (pin->gpiod == gpiod) { |
541d052d | 2317 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2318 | goto update_ena_gpio_to_rdev; |
2319 | } | |
2320 | } | |
2321 | ||
467bf301 MM |
2322 | if (new_pin == NULL) { |
2323 | mutex_unlock(®ulator_list_mutex); | |
f19b00da | 2324 | return -ENOMEM; |
467bf301 MM |
2325 | } |
2326 | ||
2327 | pin = new_pin; | |
2328 | new_pin = NULL; | |
f19b00da | 2329 | |
778b28b4 | 2330 | pin->gpiod = gpiod; |
f19b00da KM |
2331 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2332 | ||
2333 | update_ena_gpio_to_rdev: | |
2334 | pin->request_count++; | |
2335 | rdev->ena_pin = pin; | |
467bf301 MM |
2336 | |
2337 | mutex_unlock(®ulator_list_mutex); | |
2338 | kfree(new_pin); | |
2339 | ||
f19b00da KM |
2340 | return 0; |
2341 | } | |
2342 | ||
2343 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2344 | { | |
2345 | struct regulator_enable_gpio *pin, *n; | |
2346 | ||
2347 | if (!rdev->ena_pin) | |
2348 | return; | |
2349 | ||
2350 | /* Free the GPIO only in case of no use */ | |
2351 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
2dbf0855 MM |
2352 | if (pin != rdev->ena_pin) |
2353 | continue; | |
2354 | ||
2355 | if (--pin->request_count) | |
2356 | break; | |
2357 | ||
2358 | gpiod_put(pin->gpiod); | |
2359 | list_del(&pin->list); | |
2360 | kfree(pin); | |
2361 | break; | |
f19b00da | 2362 | } |
2dbf0855 MM |
2363 | |
2364 | rdev->ena_pin = NULL; | |
f19b00da KM |
2365 | } |
2366 | ||
967cfb18 | 2367 | /** |
31d6eebf RD |
2368 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2369 | * @rdev: regulator_dev structure | |
2370 | * @enable: enable GPIO at initial use? | |
2371 | * | |
967cfb18 KM |
2372 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2373 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2374 | */ | |
2375 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2376 | { | |
2377 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2378 | ||
2379 | if (!pin) | |
2380 | return -EINVAL; | |
2381 | ||
2382 | if (enable) { | |
2383 | /* Enable GPIO at initial use */ | |
2384 | if (pin->enable_count == 0) | |
01dc79cd | 2385 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2386 | |
2387 | pin->enable_count++; | |
2388 | } else { | |
2389 | if (pin->enable_count > 1) { | |
2390 | pin->enable_count--; | |
2391 | return 0; | |
2392 | } | |
2393 | ||
2394 | /* Disable GPIO if not used */ | |
2395 | if (pin->enable_count <= 1) { | |
01dc79cd | 2396 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2397 | pin->enable_count = 0; |
2398 | } | |
2399 | } | |
2400 | ||
2401 | return 0; | |
2402 | } | |
2403 | ||
79fd1141 GX |
2404 | /** |
2405 | * _regulator_enable_delay - a delay helper function | |
2406 | * @delay: time to delay in microseconds | |
2407 | * | |
2408 | * Delay for the requested amount of time as per the guidelines in: | |
2409 | * | |
458f69ef | 2410 | * Documentation/timers/timers-howto.rst |
79fd1141 GX |
2411 | * |
2412 | * The assumption here is that regulators will never be enabled in | |
2413 | * atomic context and therefore sleeping functions can be used. | |
2414 | */ | |
2415 | static void _regulator_enable_delay(unsigned int delay) | |
2416 | { | |
2417 | unsigned int ms = delay / 1000; | |
2418 | unsigned int us = delay % 1000; | |
2419 | ||
2420 | if (ms > 0) { | |
2421 | /* | |
2422 | * For small enough values, handle super-millisecond | |
2423 | * delays in the usleep_range() call below. | |
2424 | */ | |
2425 | if (ms < 20) | |
2426 | us += ms * 1000; | |
2427 | else | |
2428 | msleep(ms); | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * Give the scheduler some room to coalesce with any other | |
2433 | * wakeup sources. For delays shorter than 10 us, don't even | |
2434 | * bother setting up high-resolution timers and just busy- | |
2435 | * loop. | |
2436 | */ | |
2437 | if (us >= 10) | |
2438 | usleep_range(us, us + 100); | |
2439 | else | |
2440 | udelay(us); | |
2441 | } | |
2442 | ||
f7d7ad42 SS |
2443 | /** |
2444 | * _regulator_check_status_enabled | |
2445 | * | |
2446 | * A helper function to check if the regulator status can be interpreted | |
2447 | * as 'regulator is enabled'. | |
2448 | * @rdev: the regulator device to check | |
2449 | * | |
2450 | * Return: | |
2451 | * * 1 - if status shows regulator is in enabled state | |
2452 | * * 0 - if not enabled state | |
2453 | * * Error Value - as received from ops->get_status() | |
2454 | */ | |
2455 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2456 | { | |
2457 | int ret = rdev->desc->ops->get_status(rdev); | |
2458 | ||
2459 | if (ret < 0) { | |
2460 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | switch (ret) { | |
2465 | case REGULATOR_STATUS_OFF: | |
2466 | case REGULATOR_STATUS_ERROR: | |
2467 | case REGULATOR_STATUS_UNDEFINED: | |
2468 | return 0; | |
2469 | default: | |
2470 | return 1; | |
2471 | } | |
2472 | } | |
2473 | ||
5c5659d0 MB |
2474 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2475 | { | |
2476 | int ret, delay; | |
2477 | ||
2478 | /* Query before enabling in case configuration dependent. */ | |
2479 | ret = _regulator_get_enable_time(rdev); | |
2480 | if (ret >= 0) { | |
2481 | delay = ret; | |
2482 | } else { | |
61aab5ad | 2483 | rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret)); |
5c5659d0 MB |
2484 | delay = 0; |
2485 | } | |
2486 | ||
2487 | trace_regulator_enable(rdev_get_name(rdev)); | |
2488 | ||
871f5650 GX |
2489 | if (rdev->desc->off_on_delay) { |
2490 | /* if needed, keep a distance of off_on_delay from last time | |
2491 | * this regulator was disabled. | |
2492 | */ | |
2493 | unsigned long start_jiffy = jiffies; | |
2494 | unsigned long intended, max_delay, remaining; | |
2495 | ||
2496 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2497 | intended = rdev->last_off_jiffy + max_delay; | |
2498 | ||
2499 | if (time_before(start_jiffy, intended)) { | |
2500 | /* calc remaining jiffies to deal with one-time | |
2501 | * timer wrapping. | |
2502 | * in case of multiple timer wrapping, either it can be | |
2503 | * detected by out-of-range remaining, or it cannot be | |
48f1b4ef | 2504 | * detected and we get a penalty of |
871f5650 GX |
2505 | * _regulator_enable_delay(). |
2506 | */ | |
2507 | remaining = intended - start_jiffy; | |
2508 | if (remaining <= max_delay) | |
2509 | _regulator_enable_delay( | |
2510 | jiffies_to_usecs(remaining)); | |
2511 | } | |
2512 | } | |
2513 | ||
967cfb18 | 2514 | if (rdev->ena_pin) { |
29d62ec5 DA |
2515 | if (!rdev->ena_gpio_state) { |
2516 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2517 | if (ret < 0) | |
2518 | return ret; | |
2519 | rdev->ena_gpio_state = 1; | |
2520 | } | |
65f73508 | 2521 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2522 | ret = rdev->desc->ops->enable(rdev); |
2523 | if (ret < 0) | |
2524 | return ret; | |
2525 | } else { | |
2526 | return -EINVAL; | |
2527 | } | |
2528 | ||
2529 | /* Allow the regulator to ramp; it would be useful to extend | |
2530 | * this for bulk operations so that the regulators can ramp | |
69b8821e SK |
2531 | * together. |
2532 | */ | |
5c5659d0 MB |
2533 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
2534 | ||
f7d7ad42 SS |
2535 | /* If poll_enabled_time is set, poll upto the delay calculated |
2536 | * above, delaying poll_enabled_time uS to check if the regulator | |
2537 | * actually got enabled. | |
2538 | * If the regulator isn't enabled after enable_delay has | |
2539 | * expired, return -ETIMEDOUT. | |
2540 | */ | |
2541 | if (rdev->desc->poll_enabled_time) { | |
2542 | unsigned int time_remaining = delay; | |
2543 | ||
2544 | while (time_remaining > 0) { | |
2545 | _regulator_enable_delay(rdev->desc->poll_enabled_time); | |
2546 | ||
2547 | if (rdev->desc->ops->get_status) { | |
2548 | ret = _regulator_check_status_enabled(rdev); | |
2549 | if (ret < 0) | |
2550 | return ret; | |
2551 | else if (ret) | |
2552 | break; | |
2553 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2554 | break; | |
2555 | ||
2556 | time_remaining -= rdev->desc->poll_enabled_time; | |
2557 | } | |
2558 | ||
2559 | if (time_remaining <= 0) { | |
2560 | rdev_err(rdev, "Enabled check timed out\n"); | |
2561 | return -ETIMEDOUT; | |
2562 | } | |
2563 | } else { | |
2564 | _regulator_enable_delay(delay); | |
2565 | } | |
5c5659d0 MB |
2566 | |
2567 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2568 | ||
2569 | return 0; | |
2570 | } | |
2571 | ||
5451781d DA |
2572 | /** |
2573 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2574 | * @regulator: regulator source | |
2575 | * | |
2576 | * Some things on a regulator consumer (like the contribution towards total | |
2577 | * load on the regulator) only have an effect when the consumer wants the | |
2578 | * regulator enabled. Explained in example with two consumers of the same | |
2579 | * regulator: | |
2580 | * consumer A: set_load(100); => total load = 0 | |
2581 | * consumer A: regulator_enable(); => total load = 100 | |
2582 | * consumer B: set_load(1000); => total load = 100 | |
2583 | * consumer B: regulator_enable(); => total load = 1100 | |
2584 | * consumer A: regulator_disable(); => total_load = 1000 | |
2585 | * | |
2586 | * This function (together with _regulator_handle_consumer_disable) is | |
2587 | * responsible for keeping track of the refcount for a given regulator consumer | |
2588 | * and applying / unapplying these things. | |
2589 | * | |
2590 | * Returns 0 upon no error; -error upon error. | |
2591 | */ | |
2592 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2593 | { | |
2594 | struct regulator_dev *rdev = regulator->rdev; | |
2595 | ||
2596 | lockdep_assert_held_once(&rdev->mutex.base); | |
2597 | ||
2598 | regulator->enable_count++; | |
2599 | if (regulator->uA_load && regulator->enable_count == 1) | |
2600 | return drms_uA_update(rdev); | |
2601 | ||
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | /** | |
2606 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2607 | * @regulator: regulator source | |
2608 | * | |
2609 | * The opposite of _regulator_handle_consumer_enable(). | |
2610 | * | |
2611 | * Returns 0 upon no error; -error upon error. | |
2612 | */ | |
2613 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2614 | { | |
2615 | struct regulator_dev *rdev = regulator->rdev; | |
2616 | ||
2617 | lockdep_assert_held_once(&rdev->mutex.base); | |
2618 | ||
2619 | if (!regulator->enable_count) { | |
2620 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2621 | return -EINVAL; | |
2622 | } | |
2623 | ||
2624 | regulator->enable_count--; | |
2625 | if (regulator->uA_load && regulator->enable_count == 0) | |
2626 | return drms_uA_update(rdev); | |
2627 | ||
2628 | return 0; | |
2629 | } | |
2630 | ||
414c70cb | 2631 | /* locks held by regulator_enable() */ |
5451781d | 2632 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2633 | { |
5451781d | 2634 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2635 | int ret; |
414c70cb | 2636 | |
f8702f9e DO |
2637 | lockdep_assert_held_once(&rdev->mutex.base); |
2638 | ||
1fc12b05 | 2639 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2640 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2641 | if (ret < 0) |
2642 | return ret; | |
2643 | } | |
2644 | ||
2645 | /* balance only if there are regulators coupled */ | |
2646 | if (rdev->coupling_desc.n_coupled > 1) { | |
2647 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2648 | if (ret < 0) | |
2649 | goto err_disable_supply; | |
2650 | } | |
70cfef26 | 2651 | |
5451781d DA |
2652 | ret = _regulator_handle_consumer_enable(regulator); |
2653 | if (ret < 0) | |
2654 | goto err_disable_supply; | |
414c70cb | 2655 | |
9a2372fa MB |
2656 | if (rdev->use_count == 0) { |
2657 | /* The regulator may on if it's not switchable or left on */ | |
2658 | ret = _regulator_is_enabled(rdev); | |
2659 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2660 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2661 | REGULATOR_CHANGE_STATUS)) { |
2662 | ret = -EPERM; | |
5451781d | 2663 | goto err_consumer_disable; |
f8702f9e | 2664 | } |
9a2372fa | 2665 | |
5c5659d0 | 2666 | ret = _regulator_do_enable(rdev); |
31aae2be | 2667 | if (ret < 0) |
5451781d | 2668 | goto err_consumer_disable; |
31aae2be | 2669 | |
264b88c9 HG |
2670 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2671 | NULL); | |
a7433cff | 2672 | } else if (ret < 0) { |
61aab5ad | 2673 | rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret)); |
5451781d | 2674 | goto err_consumer_disable; |
414c70cb | 2675 | } |
a7433cff | 2676 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2677 | } |
2678 | ||
9a2372fa MB |
2679 | rdev->use_count++; |
2680 | ||
2681 | return 0; | |
f8702f9e | 2682 | |
5451781d DA |
2683 | err_consumer_disable: |
2684 | _regulator_handle_consumer_disable(regulator); | |
2685 | ||
f8702f9e | 2686 | err_disable_supply: |
1fc12b05 | 2687 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2688 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2689 | |
2690 | return ret; | |
414c70cb LG |
2691 | } |
2692 | ||
2693 | /** | |
2694 | * regulator_enable - enable regulator output | |
2695 | * @regulator: regulator source | |
2696 | * | |
cf7bbcdf MB |
2697 | * Request that the regulator be enabled with the regulator output at |
2698 | * the predefined voltage or current value. Calls to regulator_enable() | |
2699 | * must be balanced with calls to regulator_disable(). | |
2700 | * | |
414c70cb | 2701 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2702 | * hardwired in the regulator. |
414c70cb LG |
2703 | */ |
2704 | int regulator_enable(struct regulator *regulator) | |
2705 | { | |
412aec61 | 2706 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2707 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2708 | int ret; |
6492bc1b | 2709 | |
f8702f9e | 2710 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2711 | ret = _regulator_enable(regulator); |
f8702f9e | 2712 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2713 | |
414c70cb LG |
2714 | return ret; |
2715 | } | |
2716 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2717 | ||
5c5659d0 MB |
2718 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2719 | { | |
2720 | int ret; | |
2721 | ||
2722 | trace_regulator_disable(rdev_get_name(rdev)); | |
2723 | ||
967cfb18 | 2724 | if (rdev->ena_pin) { |
29d62ec5 DA |
2725 | if (rdev->ena_gpio_state) { |
2726 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2727 | if (ret < 0) | |
2728 | return ret; | |
2729 | rdev->ena_gpio_state = 0; | |
2730 | } | |
5c5659d0 MB |
2731 | |
2732 | } else if (rdev->desc->ops->disable) { | |
2733 | ret = rdev->desc->ops->disable(rdev); | |
2734 | if (ret != 0) | |
2735 | return ret; | |
2736 | } | |
2737 | ||
871f5650 GX |
2738 | /* cares about last_off_jiffy only if off_on_delay is required by |
2739 | * device. | |
2740 | */ | |
2741 | if (rdev->desc->off_on_delay) | |
2742 | rdev->last_off_jiffy = jiffies; | |
2743 | ||
5c5659d0 MB |
2744 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2745 | ||
5c5659d0 MB |
2746 | return 0; |
2747 | } | |
2748 | ||
414c70cb | 2749 | /* locks held by regulator_disable() */ |
5451781d | 2750 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2751 | { |
5451781d | 2752 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2753 | int ret = 0; |
2754 | ||
f8702f9e | 2755 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2756 | |
cd94b505 | 2757 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2758 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2759 | return -EIO; |
2760 | ||
414c70cb | 2761 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2762 | if (rdev->use_count == 1 && |
2763 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2764 | |
2765 | /* we are last user */ | |
8a34e979 | 2766 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2767 | ret = _notifier_call_chain(rdev, |
2768 | REGULATOR_EVENT_PRE_DISABLE, | |
2769 | NULL); | |
2770 | if (ret & NOTIFY_STOP_MASK) | |
2771 | return -EINVAL; | |
2772 | ||
5c5659d0 | 2773 | ret = _regulator_do_disable(rdev); |
414c70cb | 2774 | if (ret < 0) { |
61aab5ad | 2775 | rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2776 | _notifier_call_chain(rdev, |
2777 | REGULATOR_EVENT_ABORT_DISABLE, | |
2778 | NULL); | |
414c70cb LG |
2779 | return ret; |
2780 | } | |
66fda75f MP |
2781 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2782 | NULL); | |
414c70cb LG |
2783 | } |
2784 | ||
414c70cb LG |
2785 | rdev->use_count = 0; |
2786 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2787 | rdev->use_count--; |
2788 | } | |
3801b86a | 2789 | |
5451781d DA |
2790 | if (ret == 0) |
2791 | ret = _regulator_handle_consumer_disable(regulator); | |
2792 | ||
f8702f9e DO |
2793 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2794 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2795 | ||
1fc12b05 | 2796 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2797 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2798 | |
414c70cb LG |
2799 | return ret; |
2800 | } | |
2801 | ||
2802 | /** | |
2803 | * regulator_disable - disable regulator output | |
2804 | * @regulator: regulator source | |
2805 | * | |
cf7bbcdf MB |
2806 | * Disable the regulator output voltage or current. Calls to |
2807 | * regulator_enable() must be balanced with calls to | |
2808 | * regulator_disable(). | |
69279fb9 | 2809 | * |
414c70cb | 2810 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2811 | * devices have it enabled, the regulator device supports disabling and |
2812 | * machine constraints permit this operation. | |
414c70cb LG |
2813 | */ |
2814 | int regulator_disable(struct regulator *regulator) | |
2815 | { | |
412aec61 | 2816 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2817 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2818 | int ret; |
6492bc1b | 2819 | |
f8702f9e | 2820 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2821 | ret = _regulator_disable(regulator); |
f8702f9e | 2822 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2823 | |
414c70cb LG |
2824 | return ret; |
2825 | } | |
2826 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2827 | ||
2828 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2829 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2830 | { |
2831 | int ret = 0; | |
2832 | ||
f8702f9e | 2833 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2834 | |
a1c8a551 RF |
2835 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2836 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2837 | if (ret & NOTIFY_STOP_MASK) | |
2838 | return -EINVAL; | |
2839 | ||
66fda75f MP |
2840 | ret = _regulator_do_disable(rdev); |
2841 | if (ret < 0) { | |
61aab5ad | 2842 | rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret)); |
a1c8a551 RF |
2843 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2844 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2845 | return ret; |
414c70cb LG |
2846 | } |
2847 | ||
66fda75f MP |
2848 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2849 | REGULATOR_EVENT_DISABLE, NULL); | |
2850 | ||
2851 | return 0; | |
414c70cb LG |
2852 | } |
2853 | ||
2854 | /** | |
2855 | * regulator_force_disable - force disable regulator output | |
2856 | * @regulator: regulator source | |
2857 | * | |
2858 | * Forcibly disable the regulator output voltage or current. | |
2859 | * NOTE: this *will* disable the regulator output even if other consumer | |
2860 | * devices have it enabled. This should be used for situations when device | |
2861 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2862 | */ | |
2863 | int regulator_force_disable(struct regulator *regulator) | |
2864 | { | |
82d15839 | 2865 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2866 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2867 | int ret; |
2868 | ||
f8702f9e | 2869 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2870 | |
3801b86a | 2871 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2872 | |
9243a195 MP |
2873 | if (rdev->coupling_desc.n_coupled > 1) |
2874 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2875 | |
2876 | if (regulator->uA_load) { | |
2877 | regulator->uA_load = 0; | |
2878 | ret = drms_uA_update(rdev); | |
2879 | } | |
2880 | ||
1fc12b05 DA |
2881 | if (rdev->use_count != 0 && rdev->supply) |
2882 | _regulator_disable(rdev->supply); | |
8cbf811d | 2883 | |
1fc12b05 | 2884 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2885 | |
414c70cb LG |
2886 | return ret; |
2887 | } | |
2888 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2889 | ||
da07ecd9 MB |
2890 | static void regulator_disable_work(struct work_struct *work) |
2891 | { | |
2892 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2893 | disable_work.work); | |
f8702f9e | 2894 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2895 | int count, i, ret; |
5451781d DA |
2896 | struct regulator *regulator; |
2897 | int total_count = 0; | |
da07ecd9 | 2898 | |
f8702f9e | 2899 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2900 | |
c9ccaa0c TR |
2901 | /* |
2902 | * Workqueue functions queue the new work instance while the previous | |
2903 | * work instance is being processed. Cancel the queued work instance | |
2904 | * as the work instance under processing does the job of the queued | |
2905 | * work instance. | |
2906 | */ | |
2907 | cancel_delayed_work(&rdev->disable_work); | |
2908 | ||
5451781d DA |
2909 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2910 | count = regulator->deferred_disables; | |
2911 | ||
2912 | if (!count) | |
2913 | continue; | |
2914 | ||
2915 | total_count += count; | |
2916 | regulator->deferred_disables = 0; | |
2917 | ||
2918 | for (i = 0; i < count; i++) { | |
2919 | ret = _regulator_disable(regulator); | |
2920 | if (ret != 0) | |
61aab5ad MM |
2921 | rdev_err(rdev, "Deferred disable failed: %pe\n", |
2922 | ERR_PTR(ret)); | |
5451781d | 2923 | } |
da07ecd9 | 2924 | } |
5451781d | 2925 | WARN_ON(!total_count); |
da07ecd9 | 2926 | |
f8702f9e DO |
2927 | if (rdev->coupling_desc.n_coupled > 1) |
2928 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2929 | ||
2930 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2931 | } |
2932 | ||
2933 | /** | |
2934 | * regulator_disable_deferred - disable regulator output with delay | |
2935 | * @regulator: regulator source | |
48f1b4ef | 2936 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
2937 | * |
2938 | * Execute regulator_disable() on the regulator after a delay. This | |
2939 | * is intended for use with devices that require some time to quiesce. | |
2940 | * | |
2941 | * NOTE: this will only disable the regulator output if no other consumer | |
2942 | * devices have it enabled, the regulator device supports disabling and | |
2943 | * machine constraints permit this operation. | |
2944 | */ | |
2945 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2946 | { | |
2947 | struct regulator_dev *rdev = regulator->rdev; | |
2948 | ||
2b5a24a0 MB |
2949 | if (!ms) |
2950 | return regulator_disable(regulator); | |
2951 | ||
66cf9a7e | 2952 | regulator_lock(rdev); |
5451781d | 2953 | regulator->deferred_disables++; |
c9ccaa0c TR |
2954 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2955 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2956 | regulator_unlock(rdev); |
da07ecd9 | 2957 | |
70dc6daf | 2958 | return 0; |
da07ecd9 MB |
2959 | } |
2960 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2961 | ||
414c70cb LG |
2962 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2963 | { | |
65f73508 | 2964 | /* A GPIO control always takes precedence */ |
7b74d149 | 2965 | if (rdev->ena_pin) |
65f73508 MB |
2966 | return rdev->ena_gpio_state; |
2967 | ||
9a7f6a4c | 2968 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2969 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2970 | return 1; |
414c70cb | 2971 | |
9332546f | 2972 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2973 | } |
2974 | ||
3d67fe95 MP |
2975 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2976 | unsigned selector, int lock) | |
3a40cfc3 | 2977 | { |
3a40cfc3 SH |
2978 | const struct regulator_ops *ops = rdev->desc->ops; |
2979 | int ret; | |
2980 | ||
2981 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2982 | return rdev->desc->fixed_uV; | |
2983 | ||
2984 | if (ops->list_voltage) { | |
2985 | if (selector >= rdev->desc->n_voltages) | |
2986 | return -EINVAL; | |
55cca739 CB |
2987 | if (selector < rdev->desc->linear_min_sel) |
2988 | return 0; | |
3a40cfc3 | 2989 | if (lock) |
66cf9a7e | 2990 | regulator_lock(rdev); |
3a40cfc3 SH |
2991 | ret = ops->list_voltage(rdev, selector); |
2992 | if (lock) | |
66cf9a7e | 2993 | regulator_unlock(rdev); |
fd086045 | 2994 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2995 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2996 | selector, lock); | |
3a40cfc3 SH |
2997 | } else { |
2998 | return -EINVAL; | |
2999 | } | |
3000 | ||
3001 | if (ret > 0) { | |
3002 | if (ret < rdev->constraints->min_uV) | |
3003 | ret = 0; | |
3004 | else if (ret > rdev->constraints->max_uV) | |
3005 | ret = 0; | |
3006 | } | |
3007 | ||
3008 | return ret; | |
3009 | } | |
3010 | ||
414c70cb LG |
3011 | /** |
3012 | * regulator_is_enabled - is the regulator output enabled | |
3013 | * @regulator: regulator source | |
3014 | * | |
412aec61 DB |
3015 | * Returns positive if the regulator driver backing the source/client |
3016 | * has requested that the device be enabled, zero if it hasn't, else a | |
3017 | * negative errno code. | |
3018 | * | |
3019 | * Note that the device backing this regulator handle can have multiple | |
3020 | * users, so it might be enabled even if regulator_enable() was never | |
3021 | * called for this particular source. | |
414c70cb LG |
3022 | */ |
3023 | int regulator_is_enabled(struct regulator *regulator) | |
3024 | { | |
9332546f MB |
3025 | int ret; |
3026 | ||
6492bc1b MB |
3027 | if (regulator->always_on) |
3028 | return 1; | |
3029 | ||
f8702f9e | 3030 | regulator_lock(regulator->rdev); |
9332546f | 3031 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 3032 | regulator_unlock(regulator->rdev); |
9332546f MB |
3033 | |
3034 | return ret; | |
414c70cb LG |
3035 | } |
3036 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
3037 | ||
4367cfdc DB |
3038 | /** |
3039 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
3040 | * @regulator: regulator source | |
3041 | * | |
3042 | * Returns number of selectors, or negative errno. Selectors are | |
3043 | * numbered starting at zero, and typically correspond to bitfields | |
3044 | * in hardware registers. | |
3045 | */ | |
3046 | int regulator_count_voltages(struct regulator *regulator) | |
3047 | { | |
3048 | struct regulator_dev *rdev = regulator->rdev; | |
3049 | ||
26988efe JMC |
3050 | if (rdev->desc->n_voltages) |
3051 | return rdev->desc->n_voltages; | |
3052 | ||
fd086045 | 3053 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
3054 | return -EINVAL; |
3055 | ||
3056 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
3057 | } |
3058 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
3059 | ||
3060 | /** | |
3061 | * regulator_list_voltage - enumerate supported voltages | |
3062 | * @regulator: regulator source | |
3063 | * @selector: identify voltage to list | |
3064 | * Context: can sleep | |
3065 | * | |
3066 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 3067 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
3068 | * negative errno. |
3069 | */ | |
3070 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
3071 | { | |
3d67fe95 | 3072 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
3073 | } |
3074 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
3075 | ||
04eca28c TT |
3076 | /** |
3077 | * regulator_get_regmap - get the regulator's register map | |
3078 | * @regulator: regulator source | |
3079 | * | |
3080 | * Returns the register map for the given regulator, or an ERR_PTR value | |
3081 | * if the regulator doesn't use regmap. | |
3082 | */ | |
3083 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
3084 | { | |
3085 | struct regmap *map = regulator->rdev->regmap; | |
3086 | ||
3087 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
3088 | } | |
3089 | ||
3090 | /** | |
3091 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3092 | * @regulator: regulator source | |
3093 | * @vsel_reg: voltage selector register, output parameter | |
3094 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3095 | * | |
3096 | * Returns the hardware register offset and bitmask used for setting the | |
3097 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3098 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3099 | * for example. | |
3100 | * | |
3101 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3102 | * and 0 is returned, otherwise a negative errno is returned. | |
3103 | */ | |
3104 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3105 | unsigned *vsel_reg, | |
3106 | unsigned *vsel_mask) | |
3107 | { | |
39f5460d GX |
3108 | struct regulator_dev *rdev = regulator->rdev; |
3109 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3110 | |
3111 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3112 | return -EOPNOTSUPP; | |
3113 | ||
0d5c8633 CIK |
3114 | *vsel_reg = rdev->desc->vsel_reg; |
3115 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c | 3116 | |
be35cc46 | 3117 | return 0; |
04eca28c TT |
3118 | } |
3119 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3120 | ||
3121 | /** | |
3122 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3123 | * @regulator: regulator source | |
3124 | * @selector: identify voltage to list | |
3125 | * | |
3126 | * Converts the selector to a hardware-specific voltage selector that can be | |
3127 | * directly written to the regulator registers. The address of the voltage | |
3128 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3129 | * | |
3130 | * On error a negative errno is returned. | |
3131 | */ | |
3132 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3133 | unsigned selector) | |
3134 | { | |
39f5460d GX |
3135 | struct regulator_dev *rdev = regulator->rdev; |
3136 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3137 | |
3138 | if (selector >= rdev->desc->n_voltages) | |
3139 | return -EINVAL; | |
55cca739 CB |
3140 | if (selector < rdev->desc->linear_min_sel) |
3141 | return 0; | |
04eca28c TT |
3142 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) |
3143 | return -EOPNOTSUPP; | |
3144 | ||
3145 | return selector; | |
3146 | } | |
3147 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3148 | ||
2a668a8b PW |
3149 | /** |
3150 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3151 | * @regulator: regulator source | |
3152 | * | |
3153 | * Returns the voltage step size between VSEL values for linear | |
3154 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3155 | */ | |
3156 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3157 | { | |
3158 | struct regulator_dev *rdev = regulator->rdev; | |
3159 | ||
3160 | return rdev->desc->uV_step; | |
3161 | } | |
3162 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3163 | ||
a7a1ad90 MB |
3164 | /** |
3165 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3166 | * | |
3167 | * @regulator: Regulator to check. | |
3168 | * @min_uV: Minimum required voltage in uV. | |
3169 | * @max_uV: Maximum required voltage in uV. | |
3170 | * | |
49820944 | 3171 | * Returns a boolean. |
a7a1ad90 MB |
3172 | */ |
3173 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3174 | int min_uV, int max_uV) | |
3175 | { | |
c5f3939b | 3176 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3177 | int i, voltages, ret; |
3178 | ||
c5f3939b | 3179 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3180 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3181 | ret = regulator_get_voltage(regulator); |
3182 | if (ret >= 0) | |
0d25d09d | 3183 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3184 | else |
3185 | return ret; | |
3186 | } | |
3187 | ||
bd7a2b60 PM |
3188 | /* Any voltage within constrains range is fine? */ |
3189 | if (rdev->desc->continuous_voltage_range) | |
3190 | return min_uV >= rdev->constraints->min_uV && | |
3191 | max_uV <= rdev->constraints->max_uV; | |
3192 | ||
a7a1ad90 MB |
3193 | ret = regulator_count_voltages(regulator); |
3194 | if (ret < 0) | |
49820944 | 3195 | return 0; |
a7a1ad90 MB |
3196 | voltages = ret; |
3197 | ||
3198 | for (i = 0; i < voltages; i++) { | |
3199 | ret = regulator_list_voltage(regulator, i); | |
3200 | ||
3201 | if (ret >= min_uV && ret <= max_uV) | |
3202 | return 1; | |
3203 | } | |
3204 | ||
3205 | return 0; | |
3206 | } | |
a398eaa2 | 3207 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3208 | |
a204f41e SH |
3209 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3210 | int max_uV) | |
3211 | { | |
3212 | const struct regulator_desc *desc = rdev->desc; | |
3213 | ||
3214 | if (desc->ops->map_voltage) | |
3215 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3216 | ||
3217 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3218 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3219 | ||
3220 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3221 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3222 | ||
18e4b55f MV |
3223 | if (desc->ops->list_voltage == |
3224 | regulator_list_voltage_pickable_linear_range) | |
3225 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3226 | min_uV, max_uV); | |
3227 | ||
a204f41e SH |
3228 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3229 | } | |
3230 | ||
7179569a HS |
3231 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3232 | int min_uV, int max_uV, | |
3233 | unsigned *selector) | |
3234 | { | |
3235 | struct pre_voltage_change_data data; | |
3236 | int ret; | |
3237 | ||
d22b85a1 | 3238 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3239 | data.min_uV = min_uV; |
3240 | data.max_uV = max_uV; | |
3241 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3242 | &data); | |
3243 | if (ret & NOTIFY_STOP_MASK) | |
3244 | return -EINVAL; | |
3245 | ||
3246 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3247 | if (ret >= 0) | |
3248 | return ret; | |
3249 | ||
3250 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3251 | (void *)data.old_uV); | |
3252 | ||
3253 | return ret; | |
3254 | } | |
3255 | ||
3256 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3257 | int uV, unsigned selector) | |
3258 | { | |
3259 | struct pre_voltage_change_data data; | |
3260 | int ret; | |
3261 | ||
d22b85a1 | 3262 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3263 | data.min_uV = uV; |
3264 | data.max_uV = uV; | |
3265 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3266 | &data); | |
3267 | if (ret & NOTIFY_STOP_MASK) | |
3268 | return -EINVAL; | |
3269 | ||
3270 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3271 | if (ret >= 0) | |
3272 | return ret; | |
3273 | ||
3274 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3275 | (void *)data.old_uV); | |
3276 | ||
3277 | return ret; | |
3278 | } | |
3279 | ||
2da8d947 BG |
3280 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3281 | int uV, int new_selector) | |
3282 | { | |
3283 | const struct regulator_ops *ops = rdev->desc->ops; | |
3284 | int diff, old_sel, curr_sel, ret; | |
3285 | ||
3286 | /* Stepping is only needed if the regulator is enabled. */ | |
3287 | if (!_regulator_is_enabled(rdev)) | |
3288 | goto final_set; | |
3289 | ||
3290 | if (!ops->get_voltage_sel) | |
3291 | return -EINVAL; | |
3292 | ||
3293 | old_sel = ops->get_voltage_sel(rdev); | |
3294 | if (old_sel < 0) | |
3295 | return old_sel; | |
3296 | ||
3297 | diff = new_selector - old_sel; | |
3298 | if (diff == 0) | |
3299 | return 0; /* No change needed. */ | |
3300 | ||
3301 | if (diff > 0) { | |
3302 | /* Stepping up. */ | |
3303 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3304 | curr_sel < new_selector; | |
3305 | curr_sel += rdev->desc->vsel_step) { | |
3306 | /* | |
3307 | * Call the callback directly instead of using | |
3308 | * _regulator_call_set_voltage_sel() as we don't | |
3309 | * want to notify anyone yet. Same in the branch | |
3310 | * below. | |
3311 | */ | |
3312 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3313 | if (ret) | |
3314 | goto try_revert; | |
3315 | } | |
3316 | } else { | |
3317 | /* Stepping down. */ | |
3318 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3319 | curr_sel > new_selector; | |
3320 | curr_sel -= rdev->desc->vsel_step) { | |
3321 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3322 | if (ret) | |
3323 | goto try_revert; | |
3324 | } | |
3325 | } | |
3326 | ||
3327 | final_set: | |
3328 | /* The final selector will trigger the notifiers. */ | |
3329 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3330 | ||
3331 | try_revert: | |
3332 | /* | |
3333 | * At least try to return to the previous voltage if setting a new | |
3334 | * one failed. | |
3335 | */ | |
3336 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3337 | return ret; | |
3338 | } | |
3339 | ||
73e705bf MK |
3340 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3341 | int old_uV, int new_uV) | |
3342 | { | |
3343 | unsigned int ramp_delay = 0; | |
3344 | ||
3345 | if (rdev->constraints->ramp_delay) | |
3346 | ramp_delay = rdev->constraints->ramp_delay; | |
3347 | else if (rdev->desc->ramp_delay) | |
3348 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3349 | else if (rdev->constraints->settling_time) |
3350 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3351 | else if (rdev->constraints->settling_time_up && |
3352 | (new_uV > old_uV)) | |
3353 | return rdev->constraints->settling_time_up; | |
3354 | else if (rdev->constraints->settling_time_down && | |
3355 | (new_uV < old_uV)) | |
3356 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3357 | |
3358 | if (ramp_delay == 0) { | |
ba14fa1a | 3359 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3360 | return 0; |
3361 | } | |
3362 | ||
3363 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3364 | } | |
3365 | ||
75790251 MB |
3366 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3367 | int min_uV, int max_uV) | |
3368 | { | |
3369 | int ret; | |
77af1b26 | 3370 | int delay = 0; |
e113d792 | 3371 | int best_val = 0; |
75790251 | 3372 | unsigned int selector; |
eba41a5e | 3373 | int old_selector = -1; |
57995a48 | 3374 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3375 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3376 | |
3377 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3378 | ||
bf5892a8 MB |
3379 | min_uV += rdev->constraints->uV_offset; |
3380 | max_uV += rdev->constraints->uV_offset; | |
3381 | ||
eba41a5e AL |
3382 | /* |
3383 | * If we can't obtain the old selector there is not enough | |
3384 | * info to call set_voltage_time_sel(). | |
3385 | */ | |
8b7485ef | 3386 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3387 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3388 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3389 | if (old_selector < 0) |
3390 | return old_selector; | |
3391 | } | |
3392 | ||
57995a48 | 3393 | if (ops->set_voltage) { |
7179569a HS |
3394 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3395 | &selector); | |
e113d792 MB |
3396 | |
3397 | if (ret >= 0) { | |
57995a48 MK |
3398 | if (ops->list_voltage) |
3399 | best_val = ops->list_voltage(rdev, | |
3400 | selector); | |
e113d792 | 3401 | else |
d22b85a1 | 3402 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3403 | } |
3404 | ||
57995a48 | 3405 | } else if (ops->set_voltage_sel) { |
a204f41e | 3406 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3407 | if (ret >= 0) { |
57995a48 | 3408 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3409 | if (min_uV <= best_val && max_uV >= best_val) { |
3410 | selector = ret; | |
c66a566a AL |
3411 | if (old_selector == selector) |
3412 | ret = 0; | |
2da8d947 BG |
3413 | else if (rdev->desc->vsel_step) |
3414 | ret = _regulator_set_voltage_sel_step( | |
3415 | rdev, best_val, selector); | |
c66a566a | 3416 | else |
7179569a HS |
3417 | ret = _regulator_call_set_voltage_sel( |
3418 | rdev, best_val, selector); | |
e113d792 MB |
3419 | } else { |
3420 | ret = -EINVAL; | |
3421 | } | |
e8eef82b | 3422 | } |
75790251 MB |
3423 | } else { |
3424 | ret = -EINVAL; | |
3425 | } | |
e8eef82b | 3426 | |
31dfe686 MK |
3427 | if (ret) |
3428 | goto out; | |
77af1b26 | 3429 | |
73e705bf MK |
3430 | if (ops->set_voltage_time_sel) { |
3431 | /* | |
3432 | * Call set_voltage_time_sel if successfully obtained | |
3433 | * old_selector | |
3434 | */ | |
3435 | if (old_selector >= 0 && old_selector != selector) | |
3436 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3437 | selector); | |
3438 | } else { | |
3439 | if (old_uV != best_val) { | |
3440 | if (ops->set_voltage_time) | |
3441 | delay = ops->set_voltage_time(rdev, old_uV, | |
3442 | best_val); | |
3443 | else | |
3444 | delay = _regulator_set_voltage_time(rdev, | |
3445 | old_uV, | |
3446 | best_val); | |
e8eef82b | 3447 | } |
73e705bf | 3448 | } |
75790251 | 3449 | |
73e705bf | 3450 | if (delay < 0) { |
61aab5ad | 3451 | rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay)); |
73e705bf | 3452 | delay = 0; |
77af1b26 LW |
3453 | } |
3454 | ||
73e705bf MK |
3455 | /* Insert any necessary delays */ |
3456 | if (delay >= 1000) { | |
3457 | mdelay(delay / 1000); | |
3458 | udelay(delay % 1000); | |
3459 | } else if (delay) { | |
3460 | udelay(delay); | |
77af1b26 LW |
3461 | } |
3462 | ||
31dfe686 | 3463 | if (best_val >= 0) { |
2f6c797f AL |
3464 | unsigned long data = best_val; |
3465 | ||
ded06a52 | 3466 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3467 | (void *)data); |
3468 | } | |
ded06a52 | 3469 | |
31dfe686 | 3470 | out: |
eba41a5e | 3471 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3472 | |
3473 | return ret; | |
3474 | } | |
3475 | ||
f7efad10 CZ |
3476 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3477 | int min_uV, int max_uV, suspend_state_t state) | |
3478 | { | |
3479 | struct regulator_state *rstate; | |
3480 | int uV, sel; | |
3481 | ||
3482 | rstate = regulator_get_suspend_state(rdev, state); | |
3483 | if (rstate == NULL) | |
3484 | return -EINVAL; | |
3485 | ||
3486 | if (min_uV < rstate->min_uV) | |
3487 | min_uV = rstate->min_uV; | |
3488 | if (max_uV > rstate->max_uV) | |
3489 | max_uV = rstate->max_uV; | |
3490 | ||
3491 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3492 | if (sel < 0) | |
3493 | return sel; | |
3494 | ||
3495 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3496 | if (uV >= min_uV && uV <= max_uV) | |
3497 | rstate->uV = uV; | |
3498 | ||
3499 | return 0; | |
3500 | } | |
3501 | ||
a9f226bc | 3502 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3503 | int min_uV, int max_uV, |
3504 | suspend_state_t state) | |
414c70cb LG |
3505 | { |
3506 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3507 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3508 | int ret = 0; |
92d7a558 | 3509 | int old_min_uV, old_max_uV; |
c00dc359 | 3510 | int current_uV; |
414c70cb | 3511 | |
95a3c23a MB |
3512 | /* If we're setting the same range as last time the change |
3513 | * should be a noop (some cpufreq implementations use the same | |
3514 | * voltage for multiple frequencies, for example). | |
3515 | */ | |
c360a6df | 3516 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3517 | goto out; |
3518 | ||
c00dc359 | 3519 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3520 | * return successfully even though the regulator does not support |
c00dc359 BA |
3521 | * changing the voltage. |
3522 | */ | |
8a34e979 | 3523 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3524 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3525 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3526 | voltage->min_uV = min_uV; |
3527 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3528 | goto out; |
3529 | } | |
3530 | } | |
3531 | ||
414c70cb | 3532 | /* sanity check */ |
e8eef82b MB |
3533 | if (!rdev->desc->ops->set_voltage && |
3534 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3535 | ret = -EINVAL; |
3536 | goto out; | |
3537 | } | |
3538 | ||
3539 | /* constraints check */ | |
3540 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3541 | if (ret < 0) | |
3542 | goto out; | |
0d25d09d | 3543 | |
92d7a558 | 3544 | /* restore original values in case of error */ |
c360a6df CZ |
3545 | old_min_uV = voltage->min_uV; |
3546 | old_max_uV = voltage->max_uV; | |
3547 | voltage->min_uV = min_uV; | |
3548 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3549 | |
9243a195 MP |
3550 | /* for not coupled regulators this will just set the voltage */ |
3551 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3552 | if (ret < 0) { |
3553 | voltage->min_uV = old_min_uV; | |
3554 | voltage->max_uV = old_max_uV; | |
3555 | } | |
05fda3b1 | 3556 | |
9243a195 | 3557 | out: |
9243a195 MP |
3558 | return ret; |
3559 | } | |
3560 | ||
d22b85a1 DO |
3561 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3562 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3563 | { |
3564 | int best_supply_uV = 0; | |
3565 | int supply_change_uV = 0; | |
3566 | int ret; | |
3567 | ||
43fc99f2 MB |
3568 | if (rdev->supply && |
3569 | regulator_ops_is_valid(rdev->supply->rdev, | |
3570 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3571 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3572 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3573 | int current_supply_uV; |
3574 | int selector; | |
3575 | ||
3576 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3577 | if (selector < 0) { | |
3578 | ret = selector; | |
9243a195 | 3579 | goto out; |
fc42112c SH |
3580 | } |
3581 | ||
00cb9f4f | 3582 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3583 | if (best_supply_uV < 0) { |
3584 | ret = best_supply_uV; | |
9243a195 | 3585 | goto out; |
fc42112c SH |
3586 | } |
3587 | ||
3588 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3589 | ||
d22b85a1 | 3590 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3591 | if (current_supply_uV < 0) { |
3592 | ret = current_supply_uV; | |
9243a195 | 3593 | goto out; |
fc42112c SH |
3594 | } |
3595 | ||
3596 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3597 | } | |
3598 | ||
3599 | if (supply_change_uV > 0) { | |
3600 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3601 | best_supply_uV, INT_MAX, state); |
fc42112c | 3602 | if (ret) { |
61aab5ad MM |
3603 | dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n", |
3604 | ERR_PTR(ret)); | |
9243a195 | 3605 | goto out; |
fc42112c SH |
3606 | } |
3607 | } | |
3608 | ||
f7efad10 CZ |
3609 | if (state == PM_SUSPEND_ON) |
3610 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3611 | else | |
3612 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3613 | max_uV, state); | |
92d7a558 | 3614 | if (ret < 0) |
9243a195 | 3615 | goto out; |
0d25d09d | 3616 | |
fc42112c SH |
3617 | if (supply_change_uV < 0) { |
3618 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3619 | best_supply_uV, INT_MAX, state); |
fc42112c | 3620 | if (ret) |
61aab5ad MM |
3621 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n", |
3622 | ERR_PTR(ret)); | |
fc42112c SH |
3623 | /* No need to fail here */ |
3624 | ret = 0; | |
3625 | } | |
3626 | ||
414c70cb | 3627 | out: |
a9f226bc | 3628 | return ret; |
69686176 | 3629 | } |
3d7610e8 | 3630 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3631 | |
85254bcf DO |
3632 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3633 | int *current_uV, int *min_uV) | |
3634 | { | |
3635 | struct regulation_constraints *constraints = rdev->constraints; | |
3636 | ||
3637 | /* Limit voltage change only if necessary */ | |
3638 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3639 | return 1; | |
3640 | ||
3641 | if (*current_uV < 0) { | |
d22b85a1 | 3642 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3643 | |
3644 | if (*current_uV < 0) | |
3645 | return *current_uV; | |
3646 | } | |
3647 | ||
3648 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3649 | return 1; | |
3650 | ||
3651 | /* Clamp target voltage within the given step */ | |
3652 | if (*current_uV < *min_uV) | |
3653 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3654 | *min_uV); | |
3655 | else | |
3656 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3657 | *min_uV); | |
3658 | ||
3659 | return 0; | |
3660 | } | |
3661 | ||
c054c6c7 MP |
3662 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3663 | int *current_uV, | |
3664 | int *min_uV, int *max_uV, | |
3665 | suspend_state_t state, | |
3666 | int n_coupled) | |
3667 | { | |
3668 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3669 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3670 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3671 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3672 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3673 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3674 | int i, ret, max_spread; |
c054c6c7 MP |
3675 | bool done; |
3676 | ||
3677 | *current_uV = -1; | |
3678 | ||
3679 | /* | |
3680 | * If there are no coupled regulators, simply set the voltage | |
3681 | * demanded by consumers. | |
3682 | */ | |
3683 | if (n_coupled == 1) { | |
3684 | /* | |
3685 | * If consumers don't provide any demands, set voltage | |
3686 | * to min_uV | |
3687 | */ | |
3688 | desired_min_uV = constraints->min_uV; | |
3689 | desired_max_uV = constraints->max_uV; | |
3690 | ||
3691 | ret = regulator_check_consumers(rdev, | |
3692 | &desired_min_uV, | |
3693 | &desired_max_uV, state); | |
3694 | if (ret < 0) | |
3695 | return ret; | |
3696 | ||
3697 | possible_uV = desired_min_uV; | |
3698 | done = true; | |
3699 | ||
3700 | goto finish; | |
3701 | } | |
3702 | ||
3703 | /* Find highest min desired voltage */ | |
3704 | for (i = 0; i < n_coupled; i++) { | |
3705 | int tmp_min = 0; | |
3706 | int tmp_max = INT_MAX; | |
3707 | ||
f8702f9e | 3708 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3709 | |
3710 | ret = regulator_check_consumers(c_rdevs[i], | |
3711 | &tmp_min, | |
3712 | &tmp_max, state); | |
3713 | if (ret < 0) | |
3714 | return ret; | |
3715 | ||
3716 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3717 | if (ret < 0) | |
3718 | return ret; | |
69686176 | 3719 | |
c054c6c7 MP |
3720 | highest_min_uV = max(highest_min_uV, tmp_min); |
3721 | ||
3722 | if (i == 0) { | |
3723 | desired_min_uV = tmp_min; | |
3724 | desired_max_uV = tmp_max; | |
3725 | } | |
3726 | } | |
3727 | ||
d8ca7d18 DO |
3728 | max_spread = constraints->max_spread[0]; |
3729 | ||
c054c6c7 MP |
3730 | /* |
3731 | * Let target_uV be equal to the desired one if possible. | |
3732 | * If not, set it to minimum voltage, allowed by other coupled | |
3733 | * regulators. | |
3734 | */ | |
3735 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3736 | ||
3737 | /* | |
3738 | * Find min and max voltages, which currently aren't violating | |
3739 | * max_spread. | |
3740 | */ | |
3741 | for (i = 1; i < n_coupled; i++) { | |
3742 | int tmp_act; | |
3743 | ||
3744 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3745 | continue; | |
3746 | ||
d22b85a1 | 3747 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3748 | if (tmp_act < 0) |
3749 | return tmp_act; | |
3750 | ||
3751 | min_current_uV = min(tmp_act, min_current_uV); | |
3752 | max_current_uV = max(tmp_act, max_current_uV); | |
3753 | } | |
3754 | ||
3755 | /* There aren't any other regulators enabled */ | |
3756 | if (max_current_uV == 0) { | |
3757 | possible_uV = target_uV; | |
3758 | } else { | |
3759 | /* | |
3760 | * Correct target voltage, so as it currently isn't | |
3761 | * violating max_spread | |
3762 | */ | |
3763 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3764 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3765 | } | |
3766 | ||
3767 | if (possible_uV > desired_max_uV) | |
3768 | return -EINVAL; | |
3769 | ||
3770 | done = (possible_uV == target_uV); | |
3771 | desired_min_uV = possible_uV; | |
3772 | ||
3773 | finish: | |
85254bcf DO |
3774 | /* Apply max_uV_step constraint if necessary */ |
3775 | if (state == PM_SUSPEND_ON) { | |
3776 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3777 | &desired_min_uV); | |
3778 | if (ret < 0) | |
3779 | return ret; | |
3780 | ||
3781 | if (ret == 0) | |
3782 | done = false; | |
3783 | } | |
3784 | ||
c054c6c7 MP |
3785 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3786 | if (n_coupled > 1 && *current_uV == -1) { | |
3787 | ||
3788 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3789 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3790 | if (ret < 0) |
3791 | return ret; | |
3792 | ||
3793 | *current_uV = ret; | |
3794 | } else { | |
3795 | *current_uV = desired_min_uV; | |
3796 | } | |
3797 | } | |
3798 | ||
3799 | *min_uV = desired_min_uV; | |
3800 | *max_uV = desired_max_uV; | |
3801 | ||
3802 | return done; | |
3803 | } | |
3804 | ||
752db83a MS |
3805 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3806 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3807 | { |
3808 | struct regulator_dev **c_rdevs; | |
3809 | struct regulator_dev *best_rdev; | |
3810 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3811 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3812 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3813 | unsigned long c_rdev_done = 0; |
3814 | bool best_c_rdev_done; | |
c054c6c7 MP |
3815 | |
3816 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3817 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3818 | |
3819 | /* | |
3820 | * Find the best possible voltage change on each loop. Leave the loop | |
3821 | * if there isn't any possible change. | |
3822 | */ | |
3823 | do { | |
3824 | best_c_rdev_done = false; | |
3825 | best_delta = 0; | |
3826 | best_min_uV = 0; | |
3827 | best_max_uV = 0; | |
3828 | best_c_rdev = 0; | |
3829 | best_rdev = NULL; | |
3830 | ||
3831 | /* | |
3832 | * Find highest difference between optimal voltage | |
3833 | * and current voltage. | |
3834 | */ | |
3835 | for (i = 0; i < n_coupled; i++) { | |
3836 | /* | |
3837 | * optimal_uV is the best voltage that can be set for | |
3838 | * i-th regulator at the moment without violating | |
3839 | * max_spread constraint in order to balance | |
3840 | * the coupled voltages. | |
3841 | */ | |
3842 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3843 | ||
d8ca7d18 | 3844 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
3845 | continue; |
3846 | ||
3847 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3848 | ¤t_uV, | |
3849 | &optimal_uV, | |
3850 | &optimal_max_uV, | |
3851 | state, n_coupled); | |
3852 | if (ret < 0) | |
3853 | goto out; | |
3854 | ||
3855 | delta = abs(optimal_uV - current_uV); | |
3856 | ||
3857 | if (delta && best_delta <= delta) { | |
3858 | best_c_rdev_done = ret; | |
3859 | best_delta = delta; | |
3860 | best_rdev = c_rdevs[i]; | |
3861 | best_min_uV = optimal_uV; | |
3862 | best_max_uV = optimal_max_uV; | |
3863 | best_c_rdev = i; | |
3864 | } | |
3865 | } | |
3866 | ||
3867 | /* Nothing to change, return successfully */ | |
3868 | if (!best_rdev) { | |
3869 | ret = 0; | |
3870 | goto out; | |
3871 | } | |
9243a195 | 3872 | |
c054c6c7 MP |
3873 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3874 | best_max_uV, state); | |
9243a195 | 3875 | |
c054c6c7 MP |
3876 | if (ret < 0) |
3877 | goto out; | |
3878 | ||
d8ca7d18 DO |
3879 | if (best_c_rdev_done) |
3880 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
3881 | |
3882 | } while (n_coupled > 1); | |
3883 | ||
3884 | out: | |
69686176 MP |
3885 | return ret; |
3886 | } | |
3887 | ||
752db83a MS |
3888 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
3889 | suspend_state_t state) | |
3890 | { | |
3891 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3892 | struct regulator_coupler *coupler = c_desc->coupler; | |
3893 | bool skip_coupled = false; | |
3894 | ||
3895 | /* | |
3896 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3897 | * other coupled regulators. | |
3898 | */ | |
3899 | if (state != PM_SUSPEND_ON) | |
3900 | skip_coupled = true; | |
3901 | ||
3902 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
3903 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3904 | return -EPERM; | |
3905 | } | |
3906 | ||
3907 | /* Invoke custom balancer for customized couplers */ | |
3908 | if (coupler && coupler->balance_voltage) | |
3909 | return coupler->balance_voltage(coupler, rdev, state); | |
3910 | ||
3911 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
3912 | } | |
3913 | ||
a9f226bc SH |
3914 | /** |
3915 | * regulator_set_voltage - set regulator output voltage | |
3916 | * @regulator: regulator source | |
3917 | * @min_uV: Minimum required voltage in uV | |
3918 | * @max_uV: Maximum acceptable voltage in uV | |
3919 | * | |
3920 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3921 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3922 | * | |
3923 | * If the regulator is enabled then the voltage will change to the new value | |
3924 | * immediately otherwise if the regulator is disabled the regulator will | |
3925 | * output at the new voltage when enabled. | |
3926 | * | |
3927 | * NOTE: If the regulator is shared between several devices then the lowest | |
3928 | * request voltage that meets the system constraints will be used. | |
3929 | * Regulator system constraints must be set for this regulator before | |
3930 | * calling this function otherwise this call will fail. | |
3931 | */ | |
3932 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3933 | { | |
f8702f9e DO |
3934 | struct ww_acquire_ctx ww_ctx; |
3935 | int ret; | |
a9f226bc | 3936 | |
f8702f9e | 3937 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3938 | |
c360a6df CZ |
3939 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3940 | PM_SUSPEND_ON); | |
a9f226bc | 3941 | |
f8702f9e | 3942 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3943 | |
414c70cb LG |
3944 | return ret; |
3945 | } | |
3946 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3947 | ||
f7efad10 CZ |
3948 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3949 | suspend_state_t state, bool en) | |
3950 | { | |
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->changeable) | |
3958 | return -EPERM; | |
3959 | ||
3edd79cf | 3960 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3961 | |
3962 | return 0; | |
3963 | } | |
3964 | ||
3965 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3966 | suspend_state_t state) | |
3967 | { | |
3968 | return regulator_suspend_toggle(rdev, state, true); | |
3969 | } | |
3970 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3971 | ||
3972 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3973 | suspend_state_t state) | |
3974 | { | |
3975 | struct regulator *regulator; | |
3976 | struct regulator_voltage *voltage; | |
3977 | ||
3978 | /* | |
3979 | * if any consumer wants this regulator device keeping on in | |
3980 | * suspend states, don't set it as disabled. | |
3981 | */ | |
3982 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3983 | voltage = ®ulator->voltage[state]; | |
3984 | if (voltage->min_uV || voltage->max_uV) | |
3985 | return 0; | |
3986 | } | |
3987 | ||
3988 | return regulator_suspend_toggle(rdev, state, false); | |
3989 | } | |
3990 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3991 | ||
3992 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3993 | int min_uV, int max_uV, | |
3994 | suspend_state_t state) | |
3995 | { | |
3996 | struct regulator_dev *rdev = regulator->rdev; | |
3997 | struct regulator_state *rstate; | |
3998 | ||
3999 | rstate = regulator_get_suspend_state(rdev, state); | |
4000 | if (rstate == NULL) | |
4001 | return -EINVAL; | |
4002 | ||
4003 | if (rstate->min_uV == rstate->max_uV) { | |
4004 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
4005 | return -EPERM; | |
4006 | } | |
4007 | ||
4008 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
4009 | } | |
4010 | ||
4011 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
4012 | int max_uV, suspend_state_t state) | |
4013 | { | |
f8702f9e DO |
4014 | struct ww_acquire_ctx ww_ctx; |
4015 | int ret; | |
f7efad10 CZ |
4016 | |
4017 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
4018 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
4019 | return -EINVAL; | |
4020 | ||
f8702f9e | 4021 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4022 | |
4023 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
4024 | max_uV, state); | |
4025 | ||
f8702f9e | 4026 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
4027 | |
4028 | return ret; | |
4029 | } | |
4030 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
4031 | ||
88cd222b LW |
4032 | /** |
4033 | * regulator_set_voltage_time - get raise/fall time | |
4034 | * @regulator: regulator source | |
4035 | * @old_uV: starting voltage in microvolts | |
4036 | * @new_uV: target voltage in microvolts | |
4037 | * | |
4038 | * Provided with the starting and ending voltage, this function attempts to | |
4039 | * calculate the time in microseconds required to rise or fall to this new | |
4040 | * voltage. | |
4041 | */ | |
4042 | int regulator_set_voltage_time(struct regulator *regulator, | |
4043 | int old_uV, int new_uV) | |
4044 | { | |
272e2315 GX |
4045 | struct regulator_dev *rdev = regulator->rdev; |
4046 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
4047 | int old_sel = -1; |
4048 | int new_sel = -1; | |
4049 | int voltage; | |
4050 | int i; | |
4051 | ||
73e705bf MK |
4052 | if (ops->set_voltage_time) |
4053 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
4054 | else if (!ops->set_voltage_time_sel) | |
4055 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
4056 | ||
88cd222b | 4057 | /* Currently requires operations to do this */ |
73e705bf | 4058 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
4059 | return -EINVAL; |
4060 | ||
4061 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
4062 | /* We only look for exact voltage matches here */ | |
bdcd1177 CB |
4063 | if (i < rdev->desc->linear_min_sel) |
4064 | continue; | |
4065 | ||
ab97800e CB |
4066 | if (old_sel >= 0 && new_sel >= 0) |
4067 | break; | |
4068 | ||
88cd222b LW |
4069 | voltage = regulator_list_voltage(regulator, i); |
4070 | if (voltage < 0) | |
4071 | return -EINVAL; | |
4072 | if (voltage == 0) | |
4073 | continue; | |
4074 | if (voltage == old_uV) | |
4075 | old_sel = i; | |
4076 | if (voltage == new_uV) | |
4077 | new_sel = i; | |
4078 | } | |
4079 | ||
4080 | if (old_sel < 0 || new_sel < 0) | |
4081 | return -EINVAL; | |
4082 | ||
4083 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
4084 | } | |
4085 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
4086 | ||
98a175b6 | 4087 | /** |
296c6566 RD |
4088 | * regulator_set_voltage_time_sel - get raise/fall time |
4089 | * @rdev: regulator source device | |
98a175b6 YSB |
4090 | * @old_selector: selector for starting voltage |
4091 | * @new_selector: selector for target voltage | |
4092 | * | |
4093 | * Provided with the starting and target voltage selectors, this function | |
4094 | * returns time in microseconds required to rise or fall to this new voltage | |
4095 | * | |
f11d08c3 | 4096 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4097 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4098 | */ |
4099 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4100 | unsigned int old_selector, | |
4101 | unsigned int new_selector) | |
4102 | { | |
f11d08c3 | 4103 | int old_volt, new_volt; |
398715ab | 4104 | |
f11d08c3 AL |
4105 | /* sanity check */ |
4106 | if (!rdev->desc->ops->list_voltage) | |
4107 | return -EINVAL; | |
398715ab | 4108 | |
f11d08c3 AL |
4109 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4110 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4111 | ||
73e705bf MK |
4112 | if (rdev->desc->ops->set_voltage_time) |
4113 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4114 | new_volt); | |
4115 | else | |
4116 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4117 | } |
b19dbf71 | 4118 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4119 | |
606a2562 MB |
4120 | /** |
4121 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4122 | * @regulator: regulator source | |
4123 | * | |
4124 | * Re-apply the last configured voltage. This is intended to be used | |
4125 | * where some external control source the consumer is cooperating with | |
4126 | * has caused the configured voltage to change. | |
4127 | */ | |
4128 | int regulator_sync_voltage(struct regulator *regulator) | |
4129 | { | |
4130 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4131 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4132 | int ret, min_uV, max_uV; |
4133 | ||
66cf9a7e | 4134 | regulator_lock(rdev); |
606a2562 MB |
4135 | |
4136 | if (!rdev->desc->ops->set_voltage && | |
4137 | !rdev->desc->ops->set_voltage_sel) { | |
4138 | ret = -EINVAL; | |
4139 | goto out; | |
4140 | } | |
4141 | ||
4142 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4143 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4144 | ret = -EINVAL; |
4145 | goto out; | |
4146 | } | |
4147 | ||
c360a6df CZ |
4148 | min_uV = voltage->min_uV; |
4149 | max_uV = voltage->max_uV; | |
606a2562 MB |
4150 | |
4151 | /* This should be a paranoia check... */ | |
4152 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4153 | if (ret < 0) | |
4154 | goto out; | |
4155 | ||
c360a6df | 4156 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4157 | if (ret < 0) |
4158 | goto out; | |
4159 | ||
24be0c71 DO |
4160 | /* balance only, if regulator is coupled */ |
4161 | if (rdev->coupling_desc.n_coupled > 1) | |
4162 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
4163 | else | |
4164 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
606a2562 MB |
4165 | |
4166 | out: | |
66cf9a7e | 4167 | regulator_unlock(rdev); |
606a2562 MB |
4168 | return ret; |
4169 | } | |
4170 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4171 | ||
d22b85a1 | 4172 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4173 | { |
bf5892a8 | 4174 | int sel, ret; |
fef95019 MB |
4175 | bool bypassed; |
4176 | ||
4177 | if (rdev->desc->ops->get_bypass) { | |
4178 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4179 | if (ret < 0) | |
4180 | return ret; | |
4181 | if (bypassed) { | |
4182 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4183 | if (!rdev->supply) { |
4184 | rdev_err(rdev, | |
4185 | "bypassed regulator has no supply!\n"); | |
4186 | return -EPROBE_DEFER; | |
4187 | } | |
fef95019 | 4188 | |
d22b85a1 | 4189 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4190 | } |
4191 | } | |
476c2d83 MB |
4192 | |
4193 | if (rdev->desc->ops->get_voltage_sel) { | |
4194 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4195 | if (sel < 0) | |
4196 | return sel; | |
bf5892a8 | 4197 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4198 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4199 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4200 | } else if (rdev->desc->ops->list_voltage) { |
4201 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4202 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4203 | ret = rdev->desc->fixed_uV; | |
e303996e | 4204 | } else if (rdev->supply) { |
d22b85a1 | 4205 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cf1ad559 MM |
4206 | } else if (rdev->supply_name) { |
4207 | return -EPROBE_DEFER; | |
cb220d16 | 4208 | } else { |
414c70cb | 4209 | return -EINVAL; |
cb220d16 | 4210 | } |
bf5892a8 | 4211 | |
cb220d16 AL |
4212 | if (ret < 0) |
4213 | return ret; | |
bf5892a8 | 4214 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4215 | } |
3d7610e8 | 4216 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4217 | |
4218 | /** | |
4219 | * regulator_get_voltage - get regulator output voltage | |
4220 | * @regulator: regulator source | |
4221 | * | |
4222 | * This returns the current regulator voltage in uV. | |
4223 | * | |
4224 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4225 | * function should not be used to determine regulator state. | |
4226 | */ | |
4227 | int regulator_get_voltage(struct regulator *regulator) | |
4228 | { | |
f8702f9e | 4229 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4230 | int ret; |
4231 | ||
f8702f9e | 4232 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4233 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4234 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4235 | |
4236 | return ret; | |
4237 | } | |
4238 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4239 | ||
4240 | /** | |
4241 | * regulator_set_current_limit - set regulator output current limit | |
4242 | * @regulator: regulator source | |
ce0d10f8 | 4243 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4244 | * @max_uA: Maximum supported current in uA |
4245 | * | |
4246 | * Sets current sink to the desired output current. This can be set during | |
4247 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4248 | * | |
4249 | * If the regulator is enabled then the current will change to the new value | |
4250 | * immediately otherwise if the regulator is disabled the regulator will | |
4251 | * output at the new current when enabled. | |
4252 | * | |
4253 | * NOTE: Regulator system constraints must be set for this regulator before | |
4254 | * calling this function otherwise this call will fail. | |
4255 | */ | |
4256 | int regulator_set_current_limit(struct regulator *regulator, | |
4257 | int min_uA, int max_uA) | |
4258 | { | |
4259 | struct regulator_dev *rdev = regulator->rdev; | |
4260 | int ret; | |
4261 | ||
66cf9a7e | 4262 | regulator_lock(rdev); |
414c70cb LG |
4263 | |
4264 | /* sanity check */ | |
4265 | if (!rdev->desc->ops->set_current_limit) { | |
4266 | ret = -EINVAL; | |
4267 | goto out; | |
4268 | } | |
4269 | ||
4270 | /* constraints check */ | |
4271 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4272 | if (ret < 0) | |
4273 | goto out; | |
4274 | ||
4275 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4276 | out: | |
66cf9a7e | 4277 | regulator_unlock(rdev); |
414c70cb LG |
4278 | return ret; |
4279 | } | |
4280 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4281 | ||
7e4d9683 DA |
4282 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4283 | { | |
4284 | /* sanity check */ | |
4285 | if (!rdev->desc->ops->get_current_limit) | |
4286 | return -EINVAL; | |
4287 | ||
4288 | return rdev->desc->ops->get_current_limit(rdev); | |
4289 | } | |
4290 | ||
414c70cb LG |
4291 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4292 | { | |
4293 | int ret; | |
4294 | ||
66cf9a7e | 4295 | regulator_lock(rdev); |
7e4d9683 | 4296 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4297 | regulator_unlock(rdev); |
7e4d9683 | 4298 | |
414c70cb LG |
4299 | return ret; |
4300 | } | |
4301 | ||
4302 | /** | |
4303 | * regulator_get_current_limit - get regulator output current | |
4304 | * @regulator: regulator source | |
4305 | * | |
4306 | * This returns the current supplied by the specified current sink in uA. | |
4307 | * | |
4308 | * NOTE: If the regulator is disabled it will return the current value. This | |
4309 | * function should not be used to determine regulator state. | |
4310 | */ | |
4311 | int regulator_get_current_limit(struct regulator *regulator) | |
4312 | { | |
4313 | return _regulator_get_current_limit(regulator->rdev); | |
4314 | } | |
4315 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4316 | ||
4317 | /** | |
4318 | * regulator_set_mode - set regulator operating mode | |
4319 | * @regulator: regulator source | |
4320 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4321 | * | |
4322 | * Set regulator operating mode to increase regulator efficiency or improve | |
4323 | * regulation performance. | |
4324 | * | |
4325 | * NOTE: Regulator system constraints must be set for this regulator before | |
4326 | * calling this function otherwise this call will fail. | |
4327 | */ | |
4328 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4329 | { | |
4330 | struct regulator_dev *rdev = regulator->rdev; | |
4331 | int ret; | |
500b4ac9 | 4332 | int regulator_curr_mode; |
414c70cb | 4333 | |
66cf9a7e | 4334 | regulator_lock(rdev); |
414c70cb LG |
4335 | |
4336 | /* sanity check */ | |
4337 | if (!rdev->desc->ops->set_mode) { | |
4338 | ret = -EINVAL; | |
4339 | goto out; | |
4340 | } | |
4341 | ||
500b4ac9 SI |
4342 | /* return if the same mode is requested */ |
4343 | if (rdev->desc->ops->get_mode) { | |
4344 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4345 | if (regulator_curr_mode == mode) { | |
4346 | ret = 0; | |
4347 | goto out; | |
4348 | } | |
4349 | } | |
4350 | ||
414c70cb | 4351 | /* constraints check */ |
22c51b47 | 4352 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4353 | if (ret < 0) |
4354 | goto out; | |
4355 | ||
4356 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4357 | out: | |
66cf9a7e | 4358 | regulator_unlock(rdev); |
414c70cb LG |
4359 | return ret; |
4360 | } | |
4361 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4362 | ||
7e4d9683 DA |
4363 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4364 | { | |
4365 | /* sanity check */ | |
4366 | if (!rdev->desc->ops->get_mode) | |
4367 | return -EINVAL; | |
4368 | ||
4369 | return rdev->desc->ops->get_mode(rdev); | |
4370 | } | |
4371 | ||
414c70cb LG |
4372 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4373 | { | |
4374 | int ret; | |
4375 | ||
66cf9a7e | 4376 | regulator_lock(rdev); |
7e4d9683 | 4377 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4378 | regulator_unlock(rdev); |
7e4d9683 | 4379 | |
414c70cb LG |
4380 | return ret; |
4381 | } | |
4382 | ||
4383 | /** | |
4384 | * regulator_get_mode - get regulator operating mode | |
4385 | * @regulator: regulator source | |
4386 | * | |
4387 | * Get the current regulator operating mode. | |
4388 | */ | |
4389 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4390 | { | |
4391 | return _regulator_get_mode(regulator->rdev); | |
4392 | } | |
4393 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4394 | ||
1b5b4221 AH |
4395 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4396 | unsigned int *flags) | |
4397 | { | |
4398 | int ret; | |
4399 | ||
66cf9a7e | 4400 | regulator_lock(rdev); |
1b5b4221 AH |
4401 | |
4402 | /* sanity check */ | |
4403 | if (!rdev->desc->ops->get_error_flags) { | |
4404 | ret = -EINVAL; | |
4405 | goto out; | |
4406 | } | |
4407 | ||
4408 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4409 | out: | |
66cf9a7e | 4410 | regulator_unlock(rdev); |
1b5b4221 AH |
4411 | return ret; |
4412 | } | |
4413 | ||
4414 | /** | |
4415 | * regulator_get_error_flags - get regulator error information | |
4416 | * @regulator: regulator source | |
4417 | * @flags: pointer to store error flags | |
4418 | * | |
4419 | * Get the current regulator error information. | |
4420 | */ | |
4421 | int regulator_get_error_flags(struct regulator *regulator, | |
4422 | unsigned int *flags) | |
4423 | { | |
4424 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4425 | } | |
4426 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4427 | ||
414c70cb | 4428 | /** |
e39ce48f | 4429 | * regulator_set_load - set regulator load |
414c70cb LG |
4430 | * @regulator: regulator source |
4431 | * @uA_load: load current | |
4432 | * | |
4433 | * Notifies the regulator core of a new device load. This is then used by | |
4434 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4435 | * operating mode for the new regulator loading. | |
4436 | * | |
4437 | * Consumer devices notify their supply regulator of the maximum power | |
4438 | * they will require (can be taken from device datasheet in the power | |
4439 | * consumption tables) when they change operational status and hence power | |
4440 | * state. Examples of operational state changes that can affect power | |
4441 | * consumption are :- | |
4442 | * | |
4443 | * o Device is opened / closed. | |
4444 | * o Device I/O is about to begin or has just finished. | |
4445 | * o Device is idling in between work. | |
4446 | * | |
4447 | * This information is also exported via sysfs to userspace. | |
4448 | * | |
4449 | * DRMS will sum the total requested load on the regulator and change | |
4450 | * to the most efficient operating mode if platform constraints allow. | |
4451 | * | |
5451781d DA |
4452 | * NOTE: when a regulator consumer requests to have a regulator |
4453 | * disabled then any load that consumer requested no longer counts | |
4454 | * toward the total requested load. If the regulator is re-enabled | |
4455 | * then the previously requested load will start counting again. | |
4456 | * | |
4457 | * If a regulator is an always-on regulator then an individual consumer's | |
4458 | * load will still be removed if that consumer is fully disabled. | |
4459 | * | |
e39ce48f | 4460 | * On error a negative errno is returned. |
414c70cb | 4461 | */ |
e39ce48f | 4462 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4463 | { |
4464 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4465 | int old_uA_load; |
4466 | int ret = 0; | |
d92d95b6 | 4467 | |
66cf9a7e | 4468 | regulator_lock(rdev); |
5451781d | 4469 | old_uA_load = regulator->uA_load; |
414c70cb | 4470 | regulator->uA_load = uA_load; |
5451781d DA |
4471 | if (regulator->enable_count && old_uA_load != uA_load) { |
4472 | ret = drms_uA_update(rdev); | |
4473 | if (ret < 0) | |
4474 | regulator->uA_load = old_uA_load; | |
4475 | } | |
66cf9a7e | 4476 | regulator_unlock(rdev); |
8460ef38 | 4477 | |
414c70cb LG |
4478 | return ret; |
4479 | } | |
e39ce48f | 4480 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4481 | |
f59c8f9f MB |
4482 | /** |
4483 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4484 | * | |
4485 | * @regulator: Regulator to configure | |
9345dfb8 | 4486 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4487 | * |
4488 | * Allow the regulator to go into bypass mode if all other consumers | |
4489 | * for the regulator also enable bypass mode and the machine | |
4490 | * constraints allow this. Bypass mode means that the regulator is | |
4491 | * simply passing the input directly to the output with no regulation. | |
4492 | */ | |
4493 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4494 | { | |
4495 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4496 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4497 | int ret = 0; |
4498 | ||
4499 | if (!rdev->desc->ops->set_bypass) | |
4500 | return 0; | |
4501 | ||
8a34e979 | 4502 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4503 | return 0; |
4504 | ||
66cf9a7e | 4505 | regulator_lock(rdev); |
f59c8f9f MB |
4506 | |
4507 | if (enable && !regulator->bypass) { | |
4508 | rdev->bypass_count++; | |
4509 | ||
4510 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4511 | trace_regulator_bypass_enable(name); |
4512 | ||
f59c8f9f MB |
4513 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4514 | if (ret != 0) | |
4515 | rdev->bypass_count--; | |
48325655 CK |
4516 | else |
4517 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4518 | } |
4519 | ||
4520 | } else if (!enable && regulator->bypass) { | |
4521 | rdev->bypass_count--; | |
4522 | ||
4523 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4524 | trace_regulator_bypass_disable(name); |
4525 | ||
f59c8f9f MB |
4526 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4527 | if (ret != 0) | |
4528 | rdev->bypass_count++; | |
48325655 CK |
4529 | else |
4530 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4531 | } |
4532 | } | |
4533 | ||
4534 | if (ret == 0) | |
4535 | regulator->bypass = enable; | |
4536 | ||
66cf9a7e | 4537 | regulator_unlock(rdev); |
f59c8f9f MB |
4538 | |
4539 | return ret; | |
4540 | } | |
4541 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4542 | ||
414c70cb LG |
4543 | /** |
4544 | * regulator_register_notifier - register regulator event notifier | |
4545 | * @regulator: regulator source | |
69279fb9 | 4546 | * @nb: notifier block |
414c70cb LG |
4547 | * |
4548 | * Register notifier block to receive regulator events. | |
4549 | */ | |
4550 | int regulator_register_notifier(struct regulator *regulator, | |
4551 | struct notifier_block *nb) | |
4552 | { | |
4553 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4554 | nb); | |
4555 | } | |
4556 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4557 | ||
4558 | /** | |
4559 | * regulator_unregister_notifier - unregister regulator event notifier | |
4560 | * @regulator: regulator source | |
69279fb9 | 4561 | * @nb: notifier block |
414c70cb LG |
4562 | * |
4563 | * Unregister regulator event notifier block. | |
4564 | */ | |
4565 | int regulator_unregister_notifier(struct regulator *regulator, | |
4566 | struct notifier_block *nb) | |
4567 | { | |
4568 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4569 | nb); | |
4570 | } | |
4571 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4572 | ||
b136fb44 JC |
4573 | /* notify regulator consumers and downstream regulator consumers. |
4574 | * Note mutex must be held by caller. | |
4575 | */ | |
7179569a | 4576 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4577 | unsigned long event, void *data) |
4578 | { | |
414c70cb | 4579 | /* call rdev chain first */ |
7179569a | 4580 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4581 | } |
4582 | ||
4583 | /** | |
4584 | * regulator_bulk_get - get multiple regulator consumers | |
4585 | * | |
4586 | * @dev: Device to supply | |
4587 | * @num_consumers: Number of consumers to register | |
4588 | * @consumers: Configuration of consumers; clients are stored here. | |
4589 | * | |
4590 | * @return 0 on success, an errno on failure. | |
4591 | * | |
4592 | * This helper function allows drivers to get several regulator | |
4593 | * consumers in one operation. If any of the regulators cannot be | |
4594 | * acquired then any regulators that were allocated will be freed | |
4595 | * before returning to the caller. | |
4596 | */ | |
4597 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4598 | struct regulator_bulk_data *consumers) | |
4599 | { | |
4600 | int i; | |
4601 | int ret; | |
4602 | ||
4603 | for (i = 0; i < num_consumers; i++) | |
4604 | consumers[i].consumer = NULL; | |
4605 | ||
4606 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4607 | consumers[i].consumer = regulator_get(dev, |
4608 | consumers[i].supply); | |
414c70cb | 4609 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb LG |
4610 | ret = PTR_ERR(consumers[i].consumer); |
4611 | consumers[i].consumer = NULL; | |
4612 | goto err; | |
4613 | } | |
4614 | } | |
4615 | ||
4616 | return 0; | |
4617 | ||
4618 | err: | |
b9816363 | 4619 | if (ret != -EPROBE_DEFER) |
61aab5ad MM |
4620 | dev_err(dev, "Failed to get supply '%s': %pe\n", |
4621 | consumers[i].supply, ERR_PTR(ret)); | |
b9816363 JRO |
4622 | else |
4623 | dev_dbg(dev, "Failed to get supply '%s', deferring\n", | |
4624 | consumers[i].supply); | |
4625 | ||
b29c7690 | 4626 | while (--i >= 0) |
414c70cb LG |
4627 | regulator_put(consumers[i].consumer); |
4628 | ||
4629 | return ret; | |
4630 | } | |
4631 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4632 | ||
f21e0e81 MB |
4633 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4634 | { | |
4635 | struct regulator_bulk_data *bulk = data; | |
4636 | ||
4637 | bulk->ret = regulator_enable(bulk->consumer); | |
4638 | } | |
4639 | ||
414c70cb LG |
4640 | /** |
4641 | * regulator_bulk_enable - enable multiple regulator consumers | |
4642 | * | |
4643 | * @num_consumers: Number of consumers | |
4644 | * @consumers: Consumer data; clients are stored here. | |
4645 | * @return 0 on success, an errno on failure | |
4646 | * | |
4647 | * This convenience API allows consumers to enable multiple regulator | |
4648 | * clients in a single API call. If any consumers cannot be enabled | |
4649 | * then any others that were enabled will be disabled again prior to | |
4650 | * return. | |
4651 | */ | |
4652 | int regulator_bulk_enable(int num_consumers, | |
4653 | struct regulator_bulk_data *consumers) | |
4654 | { | |
2955b47d | 4655 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4656 | int i; |
f21e0e81 | 4657 | int ret = 0; |
414c70cb | 4658 | |
6492bc1b | 4659 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4660 | async_schedule_domain(regulator_bulk_enable_async, |
4661 | &consumers[i], &async_domain); | |
6492bc1b | 4662 | } |
f21e0e81 MB |
4663 | |
4664 | async_synchronize_full_domain(&async_domain); | |
4665 | ||
4666 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4667 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4668 | if (consumers[i].ret != 0) { |
4669 | ret = consumers[i].ret; | |
414c70cb | 4670 | goto err; |
f21e0e81 | 4671 | } |
414c70cb LG |
4672 | } |
4673 | ||
4674 | return 0; | |
4675 | ||
4676 | err: | |
fbe31057 AH |
4677 | for (i = 0; i < num_consumers; i++) { |
4678 | if (consumers[i].ret < 0) | |
61aab5ad MM |
4679 | pr_err("Failed to enable %s: %pe\n", consumers[i].supply, |
4680 | ERR_PTR(consumers[i].ret)); | |
fbe31057 AH |
4681 | else |
4682 | regulator_disable(consumers[i].consumer); | |
4683 | } | |
414c70cb LG |
4684 | |
4685 | return ret; | |
4686 | } | |
4687 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4688 | ||
4689 | /** | |
4690 | * regulator_bulk_disable - disable multiple regulator consumers | |
4691 | * | |
4692 | * @num_consumers: Number of consumers | |
4693 | * @consumers: Consumer data; clients are stored here. | |
4694 | * @return 0 on success, an errno on failure | |
4695 | * | |
4696 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4697 | * clients in a single API call. If any consumers cannot be disabled |
4698 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4699 | * return. |
4700 | */ | |
4701 | int regulator_bulk_disable(int num_consumers, | |
4702 | struct regulator_bulk_data *consumers) | |
4703 | { | |
4704 | int i; | |
01e86f49 | 4705 | int ret, r; |
414c70cb | 4706 | |
49e22632 | 4707 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4708 | ret = regulator_disable(consumers[i].consumer); |
4709 | if (ret != 0) | |
4710 | goto err; | |
4711 | } | |
4712 | ||
4713 | return 0; | |
4714 | ||
4715 | err: | |
61aab5ad | 4716 | pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret)); |
01e86f49 MB |
4717 | for (++i; i < num_consumers; ++i) { |
4718 | r = regulator_enable(consumers[i].consumer); | |
4719 | if (r != 0) | |
61aab5ad MM |
4720 | pr_err("Failed to re-enable %s: %pe\n", |
4721 | consumers[i].supply, ERR_PTR(r)); | |
01e86f49 | 4722 | } |
414c70cb LG |
4723 | |
4724 | return ret; | |
4725 | } | |
4726 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4727 | ||
e1de2f42 DK |
4728 | /** |
4729 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4730 | * | |
4731 | * @num_consumers: Number of consumers | |
4732 | * @consumers: Consumer data; clients are stored here. | |
4733 | * @return 0 on success, an errno on failure | |
4734 | * | |
4735 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4736 | * clients in a single API call. | |
4737 | * NOTE: This should be used for situations when device damage will | |
4738 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4739 | * Although regulator_force_disable function call for some consumers can | |
4740 | * return error numbers, the function is called for all consumers. | |
4741 | */ | |
4742 | int regulator_bulk_force_disable(int num_consumers, | |
4743 | struct regulator_bulk_data *consumers) | |
4744 | { | |
4745 | int i; | |
b8c77ff6 | 4746 | int ret = 0; |
e1de2f42 | 4747 | |
b8c77ff6 | 4748 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4749 | consumers[i].ret = |
4750 | regulator_force_disable(consumers[i].consumer); | |
4751 | ||
b8c77ff6 DT |
4752 | /* Store first error for reporting */ |
4753 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4754 | ret = consumers[i].ret; |
e1de2f42 DK |
4755 | } |
4756 | ||
e1de2f42 DK |
4757 | return ret; |
4758 | } | |
4759 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4760 | ||
414c70cb LG |
4761 | /** |
4762 | * regulator_bulk_free - free multiple regulator consumers | |
4763 | * | |
4764 | * @num_consumers: Number of consumers | |
4765 | * @consumers: Consumer data; clients are stored here. | |
4766 | * | |
4767 | * This convenience API allows consumers to free multiple regulator | |
4768 | * clients in a single API call. | |
4769 | */ | |
4770 | void regulator_bulk_free(int num_consumers, | |
4771 | struct regulator_bulk_data *consumers) | |
4772 | { | |
4773 | int i; | |
4774 | ||
4775 | for (i = 0; i < num_consumers; i++) { | |
4776 | regulator_put(consumers[i].consumer); | |
4777 | consumers[i].consumer = NULL; | |
4778 | } | |
4779 | } | |
4780 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4781 | ||
4782 | /** | |
4783 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4784 | * @rdev: regulator source |
414c70cb | 4785 | * @event: notifier block |
69279fb9 | 4786 | * @data: callback-specific data. |
414c70cb LG |
4787 | * |
4788 | * Called by regulator drivers to notify clients a regulator event has | |
3bca239d | 4789 | * occurred. |
414c70cb LG |
4790 | */ |
4791 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4792 | unsigned long event, void *data) | |
4793 | { | |
4794 | _notifier_call_chain(rdev, event, data); | |
4795 | return NOTIFY_DONE; | |
4796 | ||
4797 | } | |
4798 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4799 | ||
be721979 MB |
4800 | /** |
4801 | * regulator_mode_to_status - convert a regulator mode into a status | |
4802 | * | |
4803 | * @mode: Mode to convert | |
4804 | * | |
4805 | * Convert a regulator mode into a status. | |
4806 | */ | |
4807 | int regulator_mode_to_status(unsigned int mode) | |
4808 | { | |
4809 | switch (mode) { | |
4810 | case REGULATOR_MODE_FAST: | |
4811 | return REGULATOR_STATUS_FAST; | |
4812 | case REGULATOR_MODE_NORMAL: | |
4813 | return REGULATOR_STATUS_NORMAL; | |
4814 | case REGULATOR_MODE_IDLE: | |
4815 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4816 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4817 | return REGULATOR_STATUS_STANDBY; |
4818 | default: | |
1beaf762 | 4819 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4820 | } |
4821 | } | |
4822 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4823 | ||
39f802d6 TI |
4824 | static struct attribute *regulator_dev_attrs[] = { |
4825 | &dev_attr_name.attr, | |
4826 | &dev_attr_num_users.attr, | |
4827 | &dev_attr_type.attr, | |
4828 | &dev_attr_microvolts.attr, | |
4829 | &dev_attr_microamps.attr, | |
4830 | &dev_attr_opmode.attr, | |
4831 | &dev_attr_state.attr, | |
4832 | &dev_attr_status.attr, | |
4833 | &dev_attr_bypass.attr, | |
4834 | &dev_attr_requested_microamps.attr, | |
4835 | &dev_attr_min_microvolts.attr, | |
4836 | &dev_attr_max_microvolts.attr, | |
4837 | &dev_attr_min_microamps.attr, | |
4838 | &dev_attr_max_microamps.attr, | |
4839 | &dev_attr_suspend_standby_state.attr, | |
4840 | &dev_attr_suspend_mem_state.attr, | |
4841 | &dev_attr_suspend_disk_state.attr, | |
4842 | &dev_attr_suspend_standby_microvolts.attr, | |
4843 | &dev_attr_suspend_mem_microvolts.attr, | |
4844 | &dev_attr_suspend_disk_microvolts.attr, | |
4845 | &dev_attr_suspend_standby_mode.attr, | |
4846 | &dev_attr_suspend_mem_mode.attr, | |
4847 | &dev_attr_suspend_disk_mode.attr, | |
4848 | NULL | |
4849 | }; | |
4850 | ||
7ad68e2f DB |
4851 | /* |
4852 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4853 | * create attributes that can be meaningfully displayed. | |
4854 | */ | |
39f802d6 TI |
4855 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4856 | struct attribute *attr, int idx) | |
7ad68e2f | 4857 | { |
39f802d6 | 4858 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4859 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4860 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4861 | umode_t mode = attr->mode; |
4862 | ||
4863 | /* these three are always present */ | |
4864 | if (attr == &dev_attr_name.attr || | |
4865 | attr == &dev_attr_num_users.attr || | |
4866 | attr == &dev_attr_type.attr) | |
4867 | return mode; | |
7ad68e2f DB |
4868 | |
4869 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4870 | if (attr == &dev_attr_microvolts.attr) { |
4871 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4872 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4873 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4874 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4875 | return mode; | |
4876 | return 0; | |
f59c8f9f | 4877 | } |
7ad68e2f | 4878 | |
39f802d6 TI |
4879 | if (attr == &dev_attr_microamps.attr) |
4880 | return ops->get_current_limit ? mode : 0; | |
4881 | ||
4882 | if (attr == &dev_attr_opmode.attr) | |
4883 | return ops->get_mode ? mode : 0; | |
4884 | ||
4885 | if (attr == &dev_attr_state.attr) | |
4886 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4887 | ||
4888 | if (attr == &dev_attr_status.attr) | |
4889 | return ops->get_status ? mode : 0; | |
4890 | ||
4891 | if (attr == &dev_attr_bypass.attr) | |
4892 | return ops->get_bypass ? mode : 0; | |
4893 | ||
7ad68e2f | 4894 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4895 | if (attr == &dev_attr_min_microvolts.attr || |
4896 | attr == &dev_attr_max_microvolts.attr) | |
4897 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4898 | ||
4899 | if (attr == &dev_attr_min_microamps.attr || | |
4900 | attr == &dev_attr_max_microamps.attr) | |
4901 | return ops->set_current_limit ? mode : 0; | |
4902 | ||
4903 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4904 | attr == &dev_attr_suspend_mem_state.attr || | |
4905 | attr == &dev_attr_suspend_disk_state.attr) | |
4906 | return mode; | |
4907 | ||
4908 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4909 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4910 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4911 | return ops->set_suspend_voltage ? mode : 0; | |
4912 | ||
4913 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4914 | attr == &dev_attr_suspend_mem_mode.attr || | |
4915 | attr == &dev_attr_suspend_disk_mode.attr) | |
4916 | return ops->set_suspend_mode ? mode : 0; | |
4917 | ||
4918 | return mode; | |
4919 | } | |
4920 | ||
4921 | static const struct attribute_group regulator_dev_group = { | |
4922 | .attrs = regulator_dev_attrs, | |
4923 | .is_visible = regulator_attr_is_visible, | |
4924 | }; | |
4925 | ||
4926 | static const struct attribute_group *regulator_dev_groups[] = { | |
4927 | ®ulator_dev_group, | |
4928 | NULL | |
4929 | }; | |
7ad68e2f | 4930 | |
39f802d6 TI |
4931 | static void regulator_dev_release(struct device *dev) |
4932 | { | |
4933 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4934 | |
4935 | kfree(rdev->constraints); | |
4936 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4937 | kfree(rdev); |
7ad68e2f DB |
4938 | } |
4939 | ||
1130e5b3 MB |
4940 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4941 | { | |
a9eaa813 GR |
4942 | struct device *parent = rdev->dev.parent; |
4943 | const char *rname = rdev_get_name(rdev); | |
4944 | char name[NAME_MAX]; | |
4945 | ||
4946 | /* Avoid duplicate debugfs directory names */ | |
4947 | if (parent && rname == rdev->desc->name) { | |
4948 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4949 | rname); | |
4950 | rname = name; | |
4951 | } | |
4952 | ||
4953 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4954 | if (!rdev->debugfs) { |
1130e5b3 | 4955 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4956 | return; |
4957 | } | |
4958 | ||
4959 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4960 | &rdev->use_count); | |
4961 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4962 | &rdev->open_count); | |
f59c8f9f MB |
4963 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4964 | &rdev->bypass_count); | |
1130e5b3 MB |
4965 | } |
4966 | ||
5e3ca2b3 JMC |
4967 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4968 | { | |
7ddede6a JH |
4969 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4970 | ||
4971 | if (regulator_resolve_supply(rdev)) | |
4972 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4973 | ||
4974 | return 0; | |
5e3ca2b3 JMC |
4975 | } |
4976 | ||
d8ca7d18 DO |
4977 | int regulator_coupler_register(struct regulator_coupler *coupler) |
4978 | { | |
4979 | mutex_lock(®ulator_list_mutex); | |
4980 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
4981 | mutex_unlock(®ulator_list_mutex); | |
4982 | ||
4983 | return 0; | |
4984 | } | |
4985 | ||
4986 | static struct regulator_coupler * | |
4987 | regulator_find_coupler(struct regulator_dev *rdev) | |
4988 | { | |
4989 | struct regulator_coupler *coupler; | |
4990 | int err; | |
4991 | ||
4992 | /* | |
4993 | * Note that regulators are appended to the list and the generic | |
4994 | * coupler is registered first, hence it will be attached at last | |
4995 | * if nobody cared. | |
4996 | */ | |
4997 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
4998 | err = coupler->attach_regulator(coupler, rdev); | |
4999 | if (!err) { | |
5000 | if (!coupler->balance_voltage && | |
5001 | rdev->coupling_desc.n_coupled > 2) | |
5002 | goto err_unsupported; | |
5003 | ||
5004 | return coupler; | |
5005 | } | |
5006 | ||
5007 | if (err < 0) | |
5008 | return ERR_PTR(err); | |
5009 | ||
5010 | if (err == 1) | |
5011 | continue; | |
5012 | ||
5013 | break; | |
5014 | } | |
5015 | ||
5016 | return ERR_PTR(-EINVAL); | |
5017 | ||
5018 | err_unsupported: | |
5019 | if (coupler->detach_regulator) | |
5020 | coupler->detach_regulator(coupler, rdev); | |
5021 | ||
5022 | rdev_err(rdev, | |
5023 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
5024 | ||
5025 | return ERR_PTR(-EPERM); | |
5026 | } | |
5027 | ||
f9503385 | 5028 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 5029 | { |
d8ca7d18 | 5030 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
5031 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
5032 | int n_coupled = c_desc->n_coupled; | |
5033 | struct regulator_dev *c_rdev; | |
5034 | int i; | |
5035 | ||
5036 | for (i = 1; i < n_coupled; i++) { | |
5037 | /* already resolved */ | |
5038 | if (c_desc->coupled_rdevs[i]) | |
5039 | continue; | |
5040 | ||
5041 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
5042 | ||
f9503385 DO |
5043 | if (!c_rdev) |
5044 | continue; | |
d3d64537 | 5045 | |
d8ca7d18 DO |
5046 | if (c_rdev->coupling_desc.coupler != coupler) { |
5047 | rdev_err(rdev, "coupler mismatch with %s\n", | |
5048 | rdev_get_name(c_rdev)); | |
5049 | return; | |
5050 | } | |
5051 | ||
f9503385 DO |
5052 | c_desc->coupled_rdevs[i] = c_rdev; |
5053 | c_desc->n_resolved++; | |
d3d64537 | 5054 | |
f9503385 DO |
5055 | regulator_resolve_coupling(c_rdev); |
5056 | } | |
d3d64537 MP |
5057 | } |
5058 | ||
6303f3e7 | 5059 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 5060 | { |
d8ca7d18 | 5061 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
5062 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
5063 | struct regulator_dev *__c_rdev, *c_rdev; | |
5064 | unsigned int __n_coupled, n_coupled; | |
5065 | int i, k; | |
d8ca7d18 | 5066 | int err; |
d3d64537 | 5067 | |
6303f3e7 | 5068 | n_coupled = c_desc->n_coupled; |
d3d64537 | 5069 | |
6303f3e7 DO |
5070 | for (i = 1; i < n_coupled; i++) { |
5071 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 5072 | |
6303f3e7 DO |
5073 | if (!c_rdev) |
5074 | continue; | |
5075 | ||
5076 | regulator_lock(c_rdev); | |
5077 | ||
5078 | __c_desc = &c_rdev->coupling_desc; | |
5079 | __n_coupled = __c_desc->n_coupled; | |
5080 | ||
5081 | for (k = 1; k < __n_coupled; k++) { | |
5082 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
5083 | ||
5084 | if (__c_rdev == rdev) { | |
5085 | __c_desc->coupled_rdevs[k] = NULL; | |
5086 | __c_desc->n_resolved--; | |
5087 | break; | |
5088 | } | |
5089 | } | |
5090 | ||
5091 | regulator_unlock(c_rdev); | |
5092 | ||
5093 | c_desc->coupled_rdevs[i] = NULL; | |
5094 | c_desc->n_resolved--; | |
5095 | } | |
d8ca7d18 DO |
5096 | |
5097 | if (coupler && coupler->detach_regulator) { | |
5098 | err = coupler->detach_regulator(coupler, rdev); | |
5099 | if (err) | |
61aab5ad MM |
5100 | rdev_err(rdev, "failed to detach from coupler: %pe\n", |
5101 | ERR_PTR(err)); | |
d8ca7d18 DO |
5102 | } |
5103 | ||
5104 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5105 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5106 | } |
5107 | ||
f9503385 | 5108 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5109 | { |
7d819664 | 5110 | struct regulator_dev **coupled; |
d8ca7d18 | 5111 | int err, n_phandles; |
d3d64537 MP |
5112 | |
5113 | if (!IS_ENABLED(CONFIG_OF)) | |
5114 | n_phandles = 0; | |
5115 | else | |
5116 | n_phandles = of_get_n_coupled(rdev); | |
5117 | ||
7d819664 MM |
5118 | coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL); |
5119 | if (!coupled) | |
d8ca7d18 | 5120 | return -ENOMEM; |
d3d64537 | 5121 | |
7d819664 MM |
5122 | rdev->coupling_desc.coupled_rdevs = coupled; |
5123 | ||
d3d64537 MP |
5124 | /* |
5125 | * Every regulator should always have coupling descriptor filled with | |
5126 | * at least pointer to itself. | |
5127 | */ | |
5128 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5129 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5130 | rdev->coupling_desc.n_resolved++; | |
5131 | ||
5132 | /* regulator isn't coupled */ | |
5133 | if (n_phandles == 0) | |
5134 | return 0; | |
5135 | ||
d8ca7d18 | 5136 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5137 | return -EPERM; |
d3d64537 | 5138 | |
73a32129 | 5139 | mutex_lock(®ulator_list_mutex); |
d8ca7d18 | 5140 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
73a32129 MM |
5141 | mutex_unlock(®ulator_list_mutex); |
5142 | ||
d8ca7d18 DO |
5143 | if (IS_ERR(rdev->coupling_desc.coupler)) { |
5144 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
61aab5ad | 5145 | rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err)); |
d8ca7d18 | 5146 | return err; |
d3d64537 MP |
5147 | } |
5148 | ||
d8ca7d18 DO |
5149 | return 0; |
5150 | } | |
5151 | ||
5152 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5153 | struct regulator_dev *rdev) | |
5154 | { | |
5155 | if (rdev->coupling_desc.n_coupled > 2) { | |
5156 | rdev_err(rdev, | |
5157 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5158 | return -EPERM; |
d8ca7d18 | 5159 | } |
d3d64537 | 5160 | |
e381bfe4 DO |
5161 | if (!rdev->constraints->always_on) { |
5162 | rdev_err(rdev, | |
5163 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5164 | return -ENOTSUPP; | |
5165 | } | |
5166 | ||
d3d64537 MP |
5167 | return 0; |
5168 | } | |
5169 | ||
d8ca7d18 DO |
5170 | static struct regulator_coupler generic_regulator_coupler = { |
5171 | .attach_regulator = generic_coupler_attach, | |
5172 | }; | |
5173 | ||
414c70cb LG |
5174 | /** |
5175 | * regulator_register - register regulator | |
69279fb9 | 5176 | * @regulator_desc: regulator to register |
f47531b1 | 5177 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5178 | * |
5179 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5180 | * Returns a valid pointer to struct regulator_dev on success |
5181 | * or an ERR_PTR() on error. | |
414c70cb | 5182 | */ |
65f26846 MB |
5183 | struct regulator_dev * |
5184 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 5185 | const struct regulator_config *cfg) |
414c70cb | 5186 | { |
c172708d | 5187 | const struct regulator_init_data *init_data; |
1b3de223 | 5188 | struct regulator_config *config = NULL; |
72dca06f | 5189 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5190 | struct regulator_dev *rdev; |
0edb040d LW |
5191 | bool dangling_cfg_gpiod = false; |
5192 | bool dangling_of_gpiod = false; | |
32c8fad4 | 5193 | struct device *dev; |
a5766f11 | 5194 | int ret, i; |
414c70cb | 5195 | |
0edb040d | 5196 | if (cfg == NULL) |
414c70cb | 5197 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5198 | if (cfg->ena_gpiod) |
5199 | dangling_cfg_gpiod = true; | |
5200 | if (regulator_desc == NULL) { | |
5201 | ret = -EINVAL; | |
5202 | goto rinse; | |
5203 | } | |
414c70cb | 5204 | |
1b3de223 | 5205 | dev = cfg->dev; |
dcf70112 | 5206 | WARN_ON(!dev); |
32c8fad4 | 5207 | |
0edb040d LW |
5208 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5209 | ret = -EINVAL; | |
5210 | goto rinse; | |
5211 | } | |
414c70cb | 5212 | |
cd78dfc6 | 5213 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5214 | regulator_desc->type != REGULATOR_CURRENT) { |
5215 | ret = -EINVAL; | |
5216 | goto rinse; | |
5217 | } | |
414c70cb | 5218 | |
476c2d83 MB |
5219 | /* Only one of each should be implemented */ |
5220 | WARN_ON(regulator_desc->ops->get_voltage && | |
5221 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5222 | WARN_ON(regulator_desc->ops->set_voltage && |
5223 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5224 | |
5225 | /* If we're using selectors we must implement list_voltage. */ | |
5226 | if (regulator_desc->ops->get_voltage_sel && | |
5227 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5228 | ret = -EINVAL; |
5229 | goto rinse; | |
476c2d83 | 5230 | } |
e8eef82b MB |
5231 | if (regulator_desc->ops->set_voltage_sel && |
5232 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5233 | ret = -EINVAL; |
5234 | goto rinse; | |
e8eef82b | 5235 | } |
476c2d83 | 5236 | |
414c70cb | 5237 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5238 | if (rdev == NULL) { |
5239 | ret = -ENOMEM; | |
5240 | goto rinse; | |
5241 | } | |
d3c73156 | 5242 | device_initialize(&rdev->dev); |
414c70cb | 5243 | |
1b3de223 KK |
5244 | /* |
5245 | * Duplicate the config so the driver could override it after | |
5246 | * parsing init data. | |
5247 | */ | |
5248 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5249 | if (config == NULL) { | |
0edb040d | 5250 | ret = -ENOMEM; |
d3c73156 | 5251 | goto clean; |
1b3de223 KK |
5252 | } |
5253 | ||
bfa21a0d | 5254 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5255 | &rdev->dev.of_node); |
f8970d34 MF |
5256 | |
5257 | /* | |
5258 | * Sometimes not all resources are probed already so we need to take | |
5259 | * that into account. This happens most the time if the ena_gpiod comes | |
5260 | * from a gpio extender or something else. | |
5261 | */ | |
5262 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
f8970d34 | 5263 | ret = -EPROBE_DEFER; |
d3c73156 | 5264 | goto clean; |
f8970d34 MF |
5265 | } |
5266 | ||
0edb040d LW |
5267 | /* |
5268 | * We need to keep track of any GPIO descriptor coming from the | |
5269 | * device tree until we have handled it over to the core. If the | |
5270 | * config that was passed in to this function DOES NOT contain | |
5271 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5272 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5273 | * tree. |
5274 | */ | |
5275 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5276 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5277 | if (!init_data) { |
5278 | init_data = config->init_data; | |
5279 | rdev->dev.of_node = of_node_get(config->of_node); | |
5280 | } | |
5281 | ||
f8702f9e | 5282 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5283 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5284 | rdev->owner = regulator_desc->owner; |
5285 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5286 | if (config->regmap) |
5287 | rdev->regmap = config->regmap; | |
52b84dac | 5288 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5289 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5290 | else if (dev->parent) |
5291 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5292 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5293 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5294 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5295 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5296 | |
a5766f11 | 5297 | /* preform any regulator specific init */ |
9a8f5e07 | 5298 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5299 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
5300 | if (ret < 0) |
5301 | goto clean; | |
a5766f11 LG |
5302 | } |
5303 | ||
541d052d | 5304 | if (config->ena_gpiod) { |
daad134d KA |
5305 | ret = regulator_ena_gpio_request(rdev, config); |
5306 | if (ret != 0) { | |
61aab5ad MM |
5307 | rdev_err(rdev, "Failed to request enable GPIO: %pe\n", |
5308 | ERR_PTR(ret)); | |
32165230 | 5309 | goto clean; |
daad134d | 5310 | } |
0edb040d LW |
5311 | /* The regulator core took over the GPIO descriptor */ |
5312 | dangling_cfg_gpiod = false; | |
5313 | dangling_of_gpiod = false; | |
daad134d KA |
5314 | } |
5315 | ||
a5766f11 | 5316 | /* register with sysfs */ |
414c70cb | 5317 | rdev->dev.class = ®ulator_class; |
a5766f11 | 5318 | rdev->dev.parent = dev; |
72dca06f | 5319 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5320 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5321 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5322 | |
74f544c1 | 5323 | /* set regulator constraints */ |
9a8f5e07 | 5324 | if (init_data) |
57a6ad48 MM |
5325 | rdev->constraints = kmemdup(&init_data->constraints, |
5326 | sizeof(*rdev->constraints), | |
5327 | GFP_KERNEL); | |
5328 | else | |
5329 | rdev->constraints = kzalloc(sizeof(*rdev->constraints), | |
5330 | GFP_KERNEL); | |
5331 | if (!rdev->constraints) { | |
5332 | ret = -ENOMEM; | |
5333 | goto wash; | |
5334 | } | |
9a8f5e07 | 5335 | |
9a8f5e07 | 5336 | if (init_data && init_data->supply_regulator) |
6261b06d | 5337 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 5338 | else if (regulator_desc->supply_name) |
6261b06d | 5339 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 5340 | |
57a6ad48 | 5341 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5342 | if (ret == -EPROBE_DEFER) { |
5343 | /* Regulator might be in bypass mode and so needs its supply | |
69b8821e SK |
5344 | * to set the constraints |
5345 | */ | |
aea6cb99 MM |
5346 | /* FIXME: this currently triggers a chicken-and-egg problem |
5347 | * when creating -SUPPLY symlink in sysfs to a regulator | |
69b8821e SK |
5348 | * that is just being created |
5349 | */ | |
0917c9db MM |
5350 | rdev_dbg(rdev, "will resolve supply early: %s\n", |
5351 | rdev->supply_name); | |
aea6cb99 MM |
5352 | ret = regulator_resolve_supply(rdev); |
5353 | if (!ret) | |
57a6ad48 | 5354 | ret = set_machine_constraints(rdev); |
aea6cb99 MM |
5355 | else |
5356 | rdev_dbg(rdev, "unable to resolve supply early: %pe\n", | |
5357 | ERR_PTR(ret)); | |
5358 | } | |
45389c47 JH |
5359 | if (ret < 0) |
5360 | goto wash; | |
5361 | ||
f9503385 DO |
5362 | ret = regulator_init_coupling(rdev); |
5363 | if (ret < 0) | |
d3d64537 MP |
5364 | goto wash; |
5365 | ||
a5766f11 | 5366 | /* add consumers devices */ |
9a8f5e07 MB |
5367 | if (init_data) { |
5368 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
5369 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5370 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5371 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
5372 | if (ret < 0) { |
5373 | dev_err(dev, "Failed to set supply %s\n", | |
5374 | init_data->consumer_supplies[i].supply); | |
5375 | goto unset_supplies; | |
5376 | } | |
23c2f041 | 5377 | } |
414c70cb | 5378 | } |
a5766f11 | 5379 | |
fd086045 MK |
5380 | if (!rdev->desc->ops->get_voltage && |
5381 | !rdev->desc->ops->list_voltage && | |
5382 | !rdev->desc->fixed_uV) | |
5383 | rdev->is_switch = true; | |
5384 | ||
9177514c VZ |
5385 | ret = device_add(&rdev->dev); |
5386 | if (ret != 0) | |
c438b9d0 | 5387 | goto unset_supplies; |
c438b9d0 | 5388 | |
1130e5b3 | 5389 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5390 | |
f9503385 DO |
5391 | /* try to resolve regulators coupling since a new one was registered */ |
5392 | mutex_lock(®ulator_list_mutex); | |
5393 | regulator_resolve_coupling(rdev); | |
5394 | mutex_unlock(®ulator_list_mutex); | |
5395 | ||
5e3ca2b3 JMC |
5396 | /* try to resolve regulators supply since a new one was registered */ |
5397 | class_for_each_device(®ulator_class, NULL, NULL, | |
5398 | regulator_register_resolve_supply); | |
1b3de223 | 5399 | kfree(config); |
414c70cb | 5400 | return rdev; |
4fca9545 | 5401 | |
d4033b54 | 5402 | unset_supplies: |
45389c47 | 5403 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5404 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5405 | regulator_remove_coupling(rdev); |
45389c47 | 5406 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5407 | wash: |
26c2c997 | 5408 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5409 | mutex_lock(®ulator_list_mutex); |
32165230 | 5410 | regulator_ena_gpio_free(rdev); |
45389c47 | 5411 | mutex_unlock(®ulator_list_mutex); |
4fca9545 | 5412 | clean: |
0edb040d LW |
5413 | if (dangling_of_gpiod) |
5414 | gpiod_put(config->ena_gpiod); | |
a2151374 | 5415 | kfree(config); |
d3c73156 | 5416 | put_device(&rdev->dev); |
0edb040d LW |
5417 | rinse: |
5418 | if (dangling_cfg_gpiod) | |
5419 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5420 | return ERR_PTR(ret); |
414c70cb LG |
5421 | } |
5422 | EXPORT_SYMBOL_GPL(regulator_register); | |
5423 | ||
5424 | /** | |
5425 | * regulator_unregister - unregister regulator | |
69279fb9 | 5426 | * @rdev: regulator to unregister |
414c70cb LG |
5427 | * |
5428 | * Called by regulator drivers to unregister a regulator. | |
5429 | */ | |
5430 | void regulator_unregister(struct regulator_dev *rdev) | |
5431 | { | |
5432 | if (rdev == NULL) | |
5433 | return; | |
5434 | ||
891636ea MB |
5435 | if (rdev->supply) { |
5436 | while (rdev->use_count--) | |
5437 | regulator_disable(rdev->supply); | |
e032b376 | 5438 | regulator_put(rdev->supply); |
891636ea | 5439 | } |
ff9b34b6 | 5440 | |
06377301 CK |
5441 | flush_work(&rdev->disable_work.work); |
5442 | ||
414c70cb | 5443 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5444 | |
1130e5b3 | 5445 | debugfs_remove_recursive(rdev->debugfs); |
6bf87d17 | 5446 | WARN_ON(rdev->open_count); |
6303f3e7 | 5447 | regulator_remove_coupling(rdev); |
0f1d747b | 5448 | unset_regulator_supplies(rdev); |
414c70cb | 5449 | list_del(&rdev->list); |
f19b00da | 5450 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5451 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5452 | |
5453 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5454 | } |
5455 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5456 | ||
f7efad10 | 5457 | #ifdef CONFIG_SUSPEND |
414c70cb | 5458 | /** |
0380cf7d | 5459 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5460 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5461 | * |
5462 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5463 | */ |
0380cf7d | 5464 | static int regulator_suspend(struct device *dev) |
414c70cb | 5465 | { |
cd7e36ab | 5466 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5467 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab | 5468 | int ret; |
0955f5be SB |
5469 | const struct regulator_state *rstate; |
5470 | ||
5471 | rstate = regulator_get_suspend_state_check(rdev, state); | |
5472 | if (!rstate) | |
5473 | return 0; | |
cd7e36ab MS |
5474 | |
5475 | regulator_lock(rdev); | |
0955f5be | 5476 | ret = __suspend_set_state(rdev, rstate); |
cd7e36ab | 5477 | regulator_unlock(rdev); |
414c70cb | 5478 | |
cd7e36ab | 5479 | return ret; |
85f3b431 | 5480 | } |
d3e4eccb | 5481 | |
cd7e36ab | 5482 | static int regulator_resume(struct device *dev) |
85f3b431 | 5483 | { |
cd7e36ab | 5484 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5485 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5486 | struct regulator_state *rstate; |
cd7e36ab | 5487 | int ret = 0; |
f7efad10 | 5488 | |
cd7e36ab | 5489 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5490 | if (rstate == NULL) |
35b5f14e | 5491 | return 0; |
414c70cb | 5492 | |
0955f5be SB |
5493 | /* Avoid grabbing the lock if we don't need to */ |
5494 | if (!rdev->desc->ops->resume) | |
5495 | return 0; | |
5496 | ||
66cf9a7e | 5497 | regulator_lock(rdev); |
85f3b431 | 5498 | |
0955f5be SB |
5499 | if (rstate->enabled == ENABLE_IN_SUSPEND || |
5500 | rstate->enabled == DISABLE_IN_SUSPEND) | |
0380cf7d | 5501 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5502 | |
66cf9a7e | 5503 | regulator_unlock(rdev); |
85f3b431 | 5504 | |
f7efad10 | 5505 | return ret; |
414c70cb | 5506 | } |
f7efad10 CZ |
5507 | #else /* !CONFIG_SUSPEND */ |
5508 | ||
0380cf7d | 5509 | #define regulator_suspend NULL |
5510 | #define regulator_resume NULL | |
f7efad10 CZ |
5511 | |
5512 | #endif /* !CONFIG_SUSPEND */ | |
5513 | ||
5514 | #ifdef CONFIG_PM | |
5515 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5516 | .suspend = regulator_suspend, |
5517 | .resume = regulator_resume, | |
f7efad10 CZ |
5518 | }; |
5519 | #endif | |
5520 | ||
285c22de | 5521 | struct class regulator_class = { |
f7efad10 CZ |
5522 | .name = "regulator", |
5523 | .dev_release = regulator_dev_release, | |
5524 | .dev_groups = regulator_dev_groups, | |
5525 | #ifdef CONFIG_PM | |
5526 | .pm = ®ulator_pm_ops, | |
5527 | #endif | |
5528 | }; | |
ca725561 MB |
5529 | /** |
5530 | * regulator_has_full_constraints - the system has fully specified constraints | |
5531 | * | |
5532 | * Calling this function will cause the regulator API to disable all | |
5533 | * regulators which have a zero use count and don't have an always_on | |
5534 | * constraint in a late_initcall. | |
5535 | * | |
5536 | * The intention is that this will become the default behaviour in a | |
5537 | * future kernel release so users are encouraged to use this facility | |
5538 | * now. | |
5539 | */ | |
5540 | void regulator_has_full_constraints(void) | |
5541 | { | |
5542 | has_full_constraints = 1; | |
5543 | } | |
5544 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5545 | ||
414c70cb LG |
5546 | /** |
5547 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5548 | * @rdev: regulator |
414c70cb LG |
5549 | * |
5550 | * Get rdev regulator driver private data. This call can be used in the | |
5551 | * regulator driver context. | |
5552 | */ | |
5553 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5554 | { | |
5555 | return rdev->reg_data; | |
5556 | } | |
5557 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5558 | ||
5559 | /** | |
5560 | * regulator_get_drvdata - get regulator driver data | |
5561 | * @regulator: regulator | |
5562 | * | |
5563 | * Get regulator driver private data. This call can be used in the consumer | |
5564 | * driver context when non API regulator specific functions need to be called. | |
5565 | */ | |
5566 | void *regulator_get_drvdata(struct regulator *regulator) | |
5567 | { | |
5568 | return regulator->rdev->reg_data; | |
5569 | } | |
5570 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5571 | ||
5572 | /** | |
5573 | * regulator_set_drvdata - set regulator driver data | |
5574 | * @regulator: regulator | |
5575 | * @data: data | |
5576 | */ | |
5577 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5578 | { | |
5579 | regulator->rdev->reg_data = data; | |
5580 | } | |
5581 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5582 | ||
5583 | /** | |
d73e873b | 5584 | * rdev_get_id - get regulator ID |
69279fb9 | 5585 | * @rdev: regulator |
414c70cb LG |
5586 | */ |
5587 | int rdev_get_id(struct regulator_dev *rdev) | |
5588 | { | |
5589 | return rdev->desc->id; | |
5590 | } | |
5591 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5592 | ||
a5766f11 LG |
5593 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5594 | { | |
5595 | return &rdev->dev; | |
5596 | } | |
5597 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5598 | ||
03c87b95 BG |
5599 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5600 | { | |
5601 | return rdev->regmap; | |
5602 | } | |
5603 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5604 | ||
a5766f11 LG |
5605 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5606 | { | |
5607 | return reg_init_data->driver_data; | |
5608 | } | |
5609 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5610 | ||
ba55a974 | 5611 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5612 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5613 | { |
ba55a974 MB |
5614 | struct regulator_map *map; |
5615 | ||
ba55a974 | 5616 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5617 | seq_printf(sf, "%s -> %s.%s\n", |
5618 | rdev_get_name(map->regulator), map->dev_name, | |
5619 | map->supply); | |
ba55a974 MB |
5620 | } |
5621 | ||
dbc55955 HZ |
5622 | return 0; |
5623 | } | |
3e60b4fc | 5624 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5625 | |
85f3b431 TV |
5626 | struct summary_data { |
5627 | struct seq_file *s; | |
5628 | struct regulator_dev *parent; | |
5629 | int level; | |
5630 | }; | |
5631 | ||
5632 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5633 | struct regulator_dev *rdev, | |
5634 | int level); | |
5635 | ||
5636 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5637 | { | |
5638 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5639 | struct summary_data *summary_data = data; | |
5640 | ||
5641 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5642 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5643 | summary_data->level + 1); | |
5644 | ||
5645 | return 0; | |
5646 | } | |
5647 | ||
7c225ec9 HS |
5648 | static void regulator_summary_show_subtree(struct seq_file *s, |
5649 | struct regulator_dev *rdev, | |
5650 | int level) | |
5651 | { | |
7c225ec9 HS |
5652 | struct regulation_constraints *c; |
5653 | struct regulator *consumer; | |
85f3b431 | 5654 | struct summary_data summary_data; |
7e4d9683 | 5655 | unsigned int opmode; |
7c225ec9 HS |
5656 | |
5657 | if (!rdev) | |
5658 | return; | |
5659 | ||
7e4d9683 | 5660 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5661 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5662 | level * 3 + 1, "", |
5663 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5664 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5665 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5666 | |
d22b85a1 | 5667 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5668 | seq_printf(s, "%5dmA ", |
5669 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5670 | |
5671 | c = rdev->constraints; | |
5672 | if (c) { | |
5673 | switch (rdev->desc->type) { | |
5674 | case REGULATOR_VOLTAGE: | |
5675 | seq_printf(s, "%5dmV %5dmV ", | |
5676 | c->min_uV / 1000, c->max_uV / 1000); | |
5677 | break; | |
5678 | case REGULATOR_CURRENT: | |
5679 | seq_printf(s, "%5dmA %5dmA ", | |
5680 | c->min_uA / 1000, c->max_uA / 1000); | |
5681 | break; | |
5682 | } | |
5683 | } | |
5684 | ||
5685 | seq_puts(s, "\n"); | |
5686 | ||
5687 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5688 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5689 | continue; |
5690 | ||
5691 | seq_printf(s, "%*s%-*s ", | |
5692 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5693 | 30 - (level + 1) * 3, |
6b576eb0 | 5694 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5695 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5696 | |
5697 | switch (rdev->desc->type) { | |
5698 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5699 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5700 | consumer->enable_count, | |
7d3827b5 | 5701 | consumer->uA_load / 1000, |
5451781d DA |
5702 | consumer->uA_load && !consumer->enable_count ? |
5703 | '*' : ' ', | |
c360a6df CZ |
5704 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5705 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5706 | break; |
5707 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5708 | break; |
5709 | } | |
5710 | ||
5711 | seq_puts(s, "\n"); | |
5712 | } | |
5713 | ||
85f3b431 TV |
5714 | summary_data.s = s; |
5715 | summary_data.level = level; | |
5716 | summary_data.parent = rdev; | |
7c225ec9 | 5717 | |
85f3b431 TV |
5718 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5719 | regulator_summary_show_children); | |
f8702f9e DO |
5720 | } |
5721 | ||
5722 | struct summary_lock_data { | |
5723 | struct ww_acquire_ctx *ww_ctx; | |
5724 | struct regulator_dev **new_contended_rdev; | |
5725 | struct regulator_dev **old_contended_rdev; | |
5726 | }; | |
5727 | ||
5728 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5729 | { | |
5730 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5731 | struct summary_lock_data *lock_data = data; | |
5732 | int ret = 0; | |
5733 | ||
5734 | if (rdev != *lock_data->old_contended_rdev) { | |
5735 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5736 | ||
5737 | if (ret == -EDEADLK) | |
5738 | *lock_data->new_contended_rdev = rdev; | |
5739 | else | |
5740 | WARN_ON_ONCE(ret); | |
5741 | } else { | |
5742 | *lock_data->old_contended_rdev = NULL; | |
5743 | } | |
5744 | ||
5745 | return ret; | |
5746 | } | |
5747 | ||
5748 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5749 | { | |
5750 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5751 | struct summary_lock_data *lock_data = data; | |
5752 | ||
5753 | if (lock_data) { | |
5754 | if (rdev == *lock_data->new_contended_rdev) | |
5755 | return -EDEADLK; | |
5756 | } | |
7e4d9683 DA |
5757 | |
5758 | regulator_unlock(rdev); | |
f8702f9e DO |
5759 | |
5760 | return 0; | |
5761 | } | |
5762 | ||
5763 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5764 | struct regulator_dev **new_contended_rdev, | |
5765 | struct regulator_dev **old_contended_rdev) | |
5766 | { | |
5767 | struct summary_lock_data lock_data; | |
5768 | int ret; | |
5769 | ||
5770 | lock_data.ww_ctx = ww_ctx; | |
5771 | lock_data.new_contended_rdev = new_contended_rdev; | |
5772 | lock_data.old_contended_rdev = old_contended_rdev; | |
5773 | ||
5774 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5775 | regulator_summary_lock_one); | |
5776 | if (ret) | |
5777 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5778 | regulator_summary_unlock_one); | |
5779 | ||
5780 | return ret; | |
5781 | } | |
5782 | ||
5783 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5784 | { | |
5785 | struct regulator_dev *new_contended_rdev = NULL; | |
5786 | struct regulator_dev *old_contended_rdev = NULL; | |
5787 | int err; | |
5788 | ||
ff9b34b6 DO |
5789 | mutex_lock(®ulator_list_mutex); |
5790 | ||
f8702f9e DO |
5791 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5792 | ||
5793 | do { | |
5794 | if (new_contended_rdev) { | |
5795 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5796 | old_contended_rdev = new_contended_rdev; | |
5797 | old_contended_rdev->ref_cnt++; | |
5798 | } | |
5799 | ||
5800 | err = regulator_summary_lock_all(ww_ctx, | |
5801 | &new_contended_rdev, | |
5802 | &old_contended_rdev); | |
5803 | ||
5804 | if (old_contended_rdev) | |
5805 | regulator_unlock(old_contended_rdev); | |
5806 | ||
5807 | } while (err == -EDEADLK); | |
5808 | ||
5809 | ww_acquire_done(ww_ctx); | |
5810 | } | |
5811 | ||
5812 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5813 | { | |
5814 | class_for_each_device(®ulator_class, NULL, NULL, | |
5815 | regulator_summary_unlock_one); | |
5816 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5817 | |
5818 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5819 | } |
5820 | ||
85f3b431 | 5821 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5822 | { |
85f3b431 TV |
5823 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5824 | struct seq_file *s = data; | |
7c225ec9 | 5825 | |
85f3b431 TV |
5826 | if (!rdev->supply) |
5827 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5828 | |
85f3b431 TV |
5829 | return 0; |
5830 | } | |
7c225ec9 | 5831 | |
85f3b431 TV |
5832 | static int regulator_summary_show(struct seq_file *s, void *data) |
5833 | { | |
f8702f9e DO |
5834 | struct ww_acquire_ctx ww_ctx; |
5835 | ||
01de19d0 DA |
5836 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5837 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5838 | |
f8702f9e DO |
5839 | regulator_summary_lock(&ww_ctx); |
5840 | ||
85f3b431 TV |
5841 | class_for_each_device(®ulator_class, NULL, s, |
5842 | regulator_summary_show_roots); | |
7c225ec9 | 5843 | |
f8702f9e DO |
5844 | regulator_summary_unlock(&ww_ctx); |
5845 | ||
7c225ec9 HS |
5846 | return 0; |
5847 | } | |
3e60b4fc YL |
5848 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5849 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5850 | |
414c70cb LG |
5851 | static int __init regulator_init(void) |
5852 | { | |
34abbd68 MB |
5853 | int ret; |
5854 | ||
34abbd68 MB |
5855 | ret = class_register(®ulator_class); |
5856 | ||
1130e5b3 | 5857 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5858 | if (!debugfs_root) |
1130e5b3 | 5859 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5860 | |
3e60b4fc | 5861 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5862 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5863 | &supply_map_fops); | |
1130e5b3 | 5864 | |
7c225ec9 | 5865 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5866 | NULL, ®ulator_summary_fops); |
3e60b4fc | 5867 | #endif |
34abbd68 MB |
5868 | regulator_dummy_init(); |
5869 | ||
d8ca7d18 DO |
5870 | regulator_coupler_register(&generic_regulator_coupler); |
5871 | ||
34abbd68 | 5872 | return ret; |
414c70cb LG |
5873 | } |
5874 | ||
5875 | /* init early to allow our consumers to complete system booting */ | |
5876 | core_initcall(regulator_init); | |
ca725561 | 5877 | |
55576cf1 | 5878 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5879 | { |
609ca5f3 MB |
5880 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5881 | const struct regulator_ops *ops = rdev->desc->ops; | |
5882 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5883 | int enabled, ret; |
ca725561 | 5884 | |
609ca5f3 MB |
5885 | if (c && c->always_on) |
5886 | return 0; | |
5887 | ||
8a34e979 | 5888 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5889 | return 0; |
5890 | ||
66cf9a7e | 5891 | regulator_lock(rdev); |
609ca5f3 MB |
5892 | |
5893 | if (rdev->use_count) | |
5894 | goto unlock; | |
5895 | ||
c088a498 | 5896 | /* If we can't read the status assume it's always on. */ |
609ca5f3 MB |
5897 | if (ops->is_enabled) |
5898 | enabled = ops->is_enabled(rdev); | |
5899 | else | |
5900 | enabled = 1; | |
5901 | ||
c088a498 PHS |
5902 | /* But if reading the status failed, assume that it's off. */ |
5903 | if (enabled <= 0) | |
609ca5f3 MB |
5904 | goto unlock; |
5905 | ||
5906 | if (have_full_constraints()) { | |
5907 | /* We log since this may kill the system if it goes | |
69b8821e SK |
5908 | * wrong. |
5909 | */ | |
609ca5f3 MB |
5910 | rdev_info(rdev, "disabling\n"); |
5911 | ret = _regulator_do_disable(rdev); | |
5912 | if (ret != 0) | |
61aab5ad | 5913 | rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret)); |
609ca5f3 MB |
5914 | } else { |
5915 | /* The intention is that in future we will | |
5916 | * assume that full constraints are provided | |
5917 | * so warn even if we aren't going to do | |
5918 | * anything here. | |
5919 | */ | |
5920 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5921 | } | |
5922 | ||
5923 | unlock: | |
66cf9a7e | 5924 | regulator_unlock(rdev); |
609ca5f3 MB |
5925 | |
5926 | return 0; | |
5927 | } | |
5928 | ||
55576cf1 | 5929 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 5930 | { |
3827b64d JMC |
5931 | /* |
5932 | * Regulators may had failed to resolve their input supplies | |
5933 | * when were registered, either because the input supply was | |
5934 | * not registered yet or because its parent device was not | |
5935 | * bound yet. So attempt to resolve the input supplies for | |
5936 | * pending regulators before trying to disable unused ones. | |
5937 | */ | |
5938 | class_for_each_device(®ulator_class, NULL, NULL, | |
5939 | regulator_register_resolve_supply); | |
5940 | ||
ca725561 | 5941 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5942 | * we have permission to change the status for and which are |
5943 | * not in use or always_on. This is effectively the default | |
5944 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5945 | */ |
609ca5f3 MB |
5946 | class_for_each_device(®ulator_class, NULL, NULL, |
5947 | regulator_late_cleanup); | |
55576cf1 MB |
5948 | } |
5949 | ||
5950 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
5951 | regulator_init_complete_work_function); | |
5952 | ||
5953 | static int __init regulator_init_complete(void) | |
5954 | { | |
5955 | /* | |
5956 | * Since DT doesn't provide an idiomatic mechanism for | |
5957 | * enabling full constraints and since it's much more natural | |
5958 | * with DT to provide them just assume that a DT enabled | |
5959 | * system has full constraints. | |
5960 | */ | |
5961 | if (of_have_populated_dt()) | |
5962 | has_full_constraints = true; | |
5963 | ||
5964 | /* | |
2a15483b JS |
5965 | * We punt completion for an arbitrary amount of time since |
5966 | * systems like distros will load many drivers from userspace | |
5967 | * so consumers might not always be ready yet, this is | |
5968 | * particularly an issue with laptops where this might bounce | |
5969 | * the display off then on. Ideally we'd get a notification | |
5970 | * from userspace when this happens but we don't so just wait | |
5971 | * a bit and hope we waited long enough. It'd be better if | |
5972 | * we'd only do this on systems that need it, and a kernel | |
5973 | * command line option might be useful. | |
55576cf1 | 5974 | */ |
2a15483b JS |
5975 | schedule_delayed_work(®ulator_init_complete_work, |
5976 | msecs_to_jiffies(30000)); | |
ca725561 MB |
5977 | |
5978 | return 0; | |
5979 | } | |
fd482a3e | 5980 | late_initcall_sync(regulator_init_complete); |