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 | */ | |
193 | void regulator_lock(struct regulator_dev *rdev) | |
66cf9a7e | 194 | { |
f8702f9e | 195 | regulator_lock_nested(rdev, NULL); |
66cf9a7e | 196 | } |
14a74272 | 197 | EXPORT_SYMBOL_GPL(regulator_lock); |
66cf9a7e MP |
198 | |
199 | /** | |
200 | * regulator_unlock - unlock a single regulator | |
201 | * @rdev: regulator_source | |
202 | * | |
203 | * This function unlocks the mutex when the | |
204 | * reference counter reaches 0. | |
205 | */ | |
f8702f9e | 206 | void regulator_unlock(struct regulator_dev *rdev) |
66cf9a7e | 207 | { |
f8702f9e | 208 | mutex_lock(®ulator_nesting_mutex); |
66cf9a7e | 209 | |
f8702f9e DO |
210 | if (--rdev->ref_cnt == 0) { |
211 | rdev->mutex_owner = NULL; | |
212 | ww_mutex_unlock(&rdev->mutex); | |
66cf9a7e | 213 | } |
f8702f9e DO |
214 | |
215 | WARN_ON_ONCE(rdev->ref_cnt < 0); | |
216 | ||
217 | mutex_unlock(®ulator_nesting_mutex); | |
66cf9a7e | 218 | } |
14a74272 | 219 | EXPORT_SYMBOL_GPL(regulator_unlock); |
66cf9a7e | 220 | |
089e2cc2 | 221 | static bool regulator_supply_is_couple(struct regulator_dev *rdev) |
66cf9a7e | 222 | { |
089e2cc2 DO |
223 | struct regulator_dev *c_rdev; |
224 | int i; | |
225 | ||
226 | for (i = 1; i < rdev->coupling_desc.n_coupled; i++) { | |
227 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
66cf9a7e | 228 | |
089e2cc2 DO |
229 | if (rdev->supply->rdev == c_rdev) |
230 | return true; | |
231 | } | |
232 | ||
233 | return false; | |
234 | } | |
235 | ||
f8702f9e DO |
236 | static void regulator_unlock_recursive(struct regulator_dev *rdev, |
237 | unsigned int n_coupled) | |
9f01cd4a | 238 | { |
9243a195 | 239 | struct regulator_dev *c_rdev; |
fa731ac7 | 240 | int i; |
9f01cd4a | 241 | |
f8702f9e DO |
242 | for (i = n_coupled; i > 0; i--) { |
243 | c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1]; | |
9243a195 MP |
244 | |
245 | if (!c_rdev) | |
246 | continue; | |
247 | ||
089e2cc2 | 248 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) |
f8702f9e DO |
249 | regulator_unlock_recursive( |
250 | c_rdev->supply->rdev, | |
251 | c_rdev->coupling_desc.n_coupled); | |
9243a195 | 252 | |
f8702f9e DO |
253 | regulator_unlock(c_rdev); |
254 | } | |
9f01cd4a SH |
255 | } |
256 | ||
f8702f9e DO |
257 | static int regulator_lock_recursive(struct regulator_dev *rdev, |
258 | struct regulator_dev **new_contended_rdev, | |
259 | struct regulator_dev **old_contended_rdev, | |
260 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 261 | { |
9243a195 | 262 | struct regulator_dev *c_rdev; |
f8702f9e | 263 | int i, err; |
9f01cd4a | 264 | |
9243a195 MP |
265 | for (i = 0; i < rdev->coupling_desc.n_coupled; i++) { |
266 | c_rdev = rdev->coupling_desc.coupled_rdevs[i]; | |
456e7cdf | 267 | |
9243a195 MP |
268 | if (!c_rdev) |
269 | continue; | |
9f01cd4a | 270 | |
f8702f9e DO |
271 | if (c_rdev != *old_contended_rdev) { |
272 | err = regulator_lock_nested(c_rdev, ww_ctx); | |
273 | if (err) { | |
274 | if (err == -EDEADLK) { | |
275 | *new_contended_rdev = c_rdev; | |
276 | goto err_unlock; | |
277 | } | |
9243a195 | 278 | |
f8702f9e DO |
279 | /* shouldn't happen */ |
280 | WARN_ON_ONCE(err != -EALREADY); | |
281 | } | |
282 | } else { | |
283 | *old_contended_rdev = NULL; | |
284 | } | |
285 | ||
089e2cc2 | 286 | if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) { |
f8702f9e DO |
287 | err = regulator_lock_recursive(c_rdev->supply->rdev, |
288 | new_contended_rdev, | |
289 | old_contended_rdev, | |
290 | ww_ctx); | |
291 | if (err) { | |
292 | regulator_unlock(c_rdev); | |
293 | goto err_unlock; | |
294 | } | |
66cf9a7e MP |
295 | } |
296 | } | |
f8702f9e DO |
297 | |
298 | return 0; | |
299 | ||
300 | err_unlock: | |
301 | regulator_unlock_recursive(rdev, i); | |
302 | ||
303 | return err; | |
66cf9a7e MP |
304 | } |
305 | ||
38de19fa | 306 | /** |
f8702f9e DO |
307 | * regulator_unlock_dependent - unlock regulator's suppliers and coupled |
308 | * regulators | |
309 | * @rdev: regulator source | |
310 | * @ww_ctx: w/w mutex acquire context | |
311 | * | |
48f1b4ef | 312 | * Unlock all regulators related with rdev by coupling or supplying. |
38de19fa | 313 | */ |
f8702f9e DO |
314 | static void regulator_unlock_dependent(struct regulator_dev *rdev, |
315 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 316 | { |
f8702f9e DO |
317 | regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled); |
318 | ww_acquire_fini(ww_ctx); | |
9f01cd4a SH |
319 | } |
320 | ||
321 | /** | |
9243a195 MP |
322 | * regulator_lock_dependent - lock regulator's suppliers and coupled regulators |
323 | * @rdev: regulator source | |
f8702f9e | 324 | * @ww_ctx: w/w mutex acquire context |
9243a195 MP |
325 | * |
326 | * This function as a wrapper on regulator_lock_recursive(), which locks | |
48f1b4ef | 327 | * all regulators related with rdev by coupling or supplying. |
9f01cd4a | 328 | */ |
f8702f9e DO |
329 | static void regulator_lock_dependent(struct regulator_dev *rdev, |
330 | struct ww_acquire_ctx *ww_ctx) | |
9f01cd4a | 331 | { |
f8702f9e DO |
332 | struct regulator_dev *new_contended_rdev = NULL; |
333 | struct regulator_dev *old_contended_rdev = NULL; | |
334 | int err; | |
9f01cd4a | 335 | |
f8702f9e | 336 | mutex_lock(®ulator_list_mutex); |
456e7cdf | 337 | |
f8702f9e | 338 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
9f01cd4a | 339 | |
f8702f9e DO |
340 | do { |
341 | if (new_contended_rdev) { | |
342 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
343 | old_contended_rdev = new_contended_rdev; | |
344 | old_contended_rdev->ref_cnt++; | |
345 | } | |
346 | ||
347 | err = regulator_lock_recursive(rdev, | |
348 | &new_contended_rdev, | |
349 | &old_contended_rdev, | |
350 | ww_ctx); | |
351 | ||
352 | if (old_contended_rdev) | |
353 | regulator_unlock(old_contended_rdev); | |
354 | ||
355 | } while (err == -EDEADLK); | |
356 | ||
357 | ww_acquire_done(ww_ctx); | |
358 | ||
359 | mutex_unlock(®ulator_list_mutex); | |
9f01cd4a SH |
360 | } |
361 | ||
fe06051d | 362 | /** |
363 | * of_get_child_regulator - get a child regulator device node | |
364 | * based on supply name | |
365 | * @parent: Parent device node | |
366 | * @prop_name: Combination regulator supply name and "-supply" | |
367 | * | |
368 | * Traverse all child nodes. | |
369 | * Extract the child regulator device node corresponding to the supply name. | |
370 | * returns the device node corresponding to the regulator if found, else | |
371 | * returns NULL. | |
372 | */ | |
373 | static struct device_node *of_get_child_regulator(struct device_node *parent, | |
374 | const char *prop_name) | |
375 | { | |
376 | struct device_node *regnode = NULL; | |
377 | struct device_node *child = NULL; | |
378 | ||
379 | for_each_child_of_node(parent, child) { | |
380 | regnode = of_parse_phandle(child, prop_name, 0); | |
381 | ||
382 | if (!regnode) { | |
383 | regnode = of_get_child_regulator(child, prop_name); | |
81eeb0a3 ND |
384 | if (regnode) |
385 | goto err_node_put; | |
fe06051d | 386 | } else { |
81eeb0a3 | 387 | goto err_node_put; |
fe06051d | 388 | } |
389 | } | |
390 | return NULL; | |
81eeb0a3 ND |
391 | |
392 | err_node_put: | |
393 | of_node_put(child); | |
394 | return regnode; | |
fe06051d | 395 | } |
396 | ||
69511a45 RN |
397 | /** |
398 | * of_get_regulator - get a regulator device node based on supply name | |
399 | * @dev: Device pointer for the consumer (of regulator) device | |
400 | * @supply: regulator supply name | |
401 | * | |
402 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 403 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
404 | * returns NULL. |
405 | */ | |
406 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
407 | { | |
408 | struct device_node *regnode = NULL; | |
409 | char prop_name[32]; /* 32 is max size of property name */ | |
410 | ||
411 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
412 | ||
413 | snprintf(prop_name, 32, "%s-supply", supply); | |
414 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
415 | ||
416 | if (!regnode) { | |
fe06051d | 417 | regnode = of_get_child_regulator(dev->of_node, prop_name); |
418 | if (regnode) | |
419 | return regnode; | |
420 | ||
7799167b RH |
421 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
422 | prop_name, dev->of_node); | |
69511a45 RN |
423 | return NULL; |
424 | } | |
425 | return regnode; | |
426 | } | |
427 | ||
414c70cb | 428 | /* Platform voltage constraint check */ |
d22b85a1 DO |
429 | int regulator_check_voltage(struct regulator_dev *rdev, |
430 | int *min_uV, int *max_uV) | |
414c70cb LG |
431 | { |
432 | BUG_ON(*min_uV > *max_uV); | |
433 | ||
8a34e979 | 434 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 435 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
436 | return -EPERM; |
437 | } | |
438 | ||
439 | if (*max_uV > rdev->constraints->max_uV) | |
440 | *max_uV = rdev->constraints->max_uV; | |
441 | if (*min_uV < rdev->constraints->min_uV) | |
442 | *min_uV = rdev->constraints->min_uV; | |
443 | ||
89f425ed MB |
444 | if (*min_uV > *max_uV) { |
445 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 446 | *min_uV, *max_uV); |
414c70cb | 447 | return -EINVAL; |
89f425ed | 448 | } |
414c70cb LG |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
f7efad10 CZ |
453 | /* return 0 if the state is valid */ |
454 | static int regulator_check_states(suspend_state_t state) | |
455 | { | |
456 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
457 | } | |
458 | ||
05fda3b1 TP |
459 | /* Make sure we select a voltage that suits the needs of all |
460 | * regulator consumers | |
461 | */ | |
d22b85a1 DO |
462 | int regulator_check_consumers(struct regulator_dev *rdev, |
463 | int *min_uV, int *max_uV, | |
464 | suspend_state_t state) | |
05fda3b1 TP |
465 | { |
466 | struct regulator *regulator; | |
c360a6df | 467 | struct regulator_voltage *voltage; |
05fda3b1 TP |
468 | |
469 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 470 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
471 | /* |
472 | * Assume consumers that didn't say anything are OK | |
473 | * with anything in the constraint range. | |
474 | */ | |
c360a6df | 475 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
476 | continue; |
477 | ||
c360a6df CZ |
478 | if (*max_uV > voltage->max_uV) |
479 | *max_uV = voltage->max_uV; | |
480 | if (*min_uV < voltage->min_uV) | |
481 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
482 | } |
483 | ||
dd8004af | 484 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
485 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
486 | *min_uV, *max_uV); | |
05fda3b1 | 487 | return -EINVAL; |
dd8004af | 488 | } |
05fda3b1 TP |
489 | |
490 | return 0; | |
491 | } | |
492 | ||
414c70cb LG |
493 | /* current constraint check */ |
494 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
495 | int *min_uA, int *max_uA) | |
496 | { | |
497 | BUG_ON(*min_uA > *max_uA); | |
498 | ||
8a34e979 | 499 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 500 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
501 | return -EPERM; |
502 | } | |
503 | ||
504 | if (*max_uA > rdev->constraints->max_uA) | |
505 | *max_uA = rdev->constraints->max_uA; | |
506 | if (*min_uA < rdev->constraints->min_uA) | |
507 | *min_uA = rdev->constraints->min_uA; | |
508 | ||
89f425ed MB |
509 | if (*min_uA > *max_uA) { |
510 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 511 | *min_uA, *max_uA); |
414c70cb | 512 | return -EINVAL; |
89f425ed | 513 | } |
414c70cb LG |
514 | |
515 | return 0; | |
516 | } | |
517 | ||
518 | /* operating mode constraint check */ | |
109c75af CK |
519 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
520 | unsigned int *mode) | |
414c70cb | 521 | { |
2c608234 | 522 | switch (*mode) { |
e573520b DB |
523 | case REGULATOR_MODE_FAST: |
524 | case REGULATOR_MODE_NORMAL: | |
525 | case REGULATOR_MODE_IDLE: | |
526 | case REGULATOR_MODE_STANDBY: | |
527 | break; | |
528 | default: | |
89f425ed | 529 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
530 | return -EINVAL; |
531 | } | |
532 | ||
8a34e979 | 533 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 534 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
535 | return -EPERM; |
536 | } | |
2c608234 MB |
537 | |
538 | /* The modes are bitmasks, the most power hungry modes having | |
539 | * the lowest values. If the requested mode isn't supported | |
540 | * try higher modes. */ | |
541 | while (*mode) { | |
542 | if (rdev->constraints->valid_modes_mask & *mode) | |
543 | return 0; | |
544 | *mode /= 2; | |
414c70cb | 545 | } |
2c608234 MB |
546 | |
547 | return -EINVAL; | |
414c70cb LG |
548 | } |
549 | ||
f7efad10 CZ |
550 | static inline struct regulator_state * |
551 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
552 | { | |
553 | if (rdev->constraints == NULL) | |
554 | return NULL; | |
555 | ||
556 | switch (state) { | |
557 | case PM_SUSPEND_STANDBY: | |
558 | return &rdev->constraints->state_standby; | |
559 | case PM_SUSPEND_MEM: | |
560 | return &rdev->constraints->state_mem; | |
561 | case PM_SUSPEND_MAX: | |
562 | return &rdev->constraints->state_disk; | |
563 | default: | |
564 | return NULL; | |
565 | } | |
566 | } | |
567 | ||
414c70cb LG |
568 | static ssize_t regulator_uV_show(struct device *dev, |
569 | struct device_attribute *attr, char *buf) | |
570 | { | |
a5766f11 | 571 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
c82f27df | 572 | int uV; |
414c70cb | 573 | |
66cf9a7e | 574 | regulator_lock(rdev); |
c82f27df | 575 | uV = regulator_get_voltage_rdev(rdev); |
66cf9a7e | 576 | regulator_unlock(rdev); |
414c70cb | 577 | |
c82f27df NS |
578 | if (uV < 0) |
579 | return uV; | |
580 | return sprintf(buf, "%d\n", uV); | |
414c70cb | 581 | } |
7ad68e2f | 582 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
583 | |
584 | static ssize_t regulator_uA_show(struct device *dev, | |
585 | struct device_attribute *attr, char *buf) | |
586 | { | |
a5766f11 | 587 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
588 | |
589 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
590 | } | |
7ad68e2f | 591 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 592 | |
587cea27 GKH |
593 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
594 | char *buf) | |
bc558a60 MB |
595 | { |
596 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 597 | |
1083c393 | 598 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 599 | } |
587cea27 | 600 | static DEVICE_ATTR_RO(name); |
bc558a60 | 601 | |
01de19d0 | 602 | static const char *regulator_opmode_to_str(int mode) |
414c70cb | 603 | { |
414c70cb LG |
604 | switch (mode) { |
605 | case REGULATOR_MODE_FAST: | |
01de19d0 | 606 | return "fast"; |
414c70cb | 607 | case REGULATOR_MODE_NORMAL: |
01de19d0 | 608 | return "normal"; |
414c70cb | 609 | case REGULATOR_MODE_IDLE: |
01de19d0 | 610 | return "idle"; |
414c70cb | 611 | case REGULATOR_MODE_STANDBY: |
01de19d0 | 612 | return "standby"; |
414c70cb | 613 | } |
01de19d0 DA |
614 | return "unknown"; |
615 | } | |
616 | ||
617 | static ssize_t regulator_print_opmode(char *buf, int mode) | |
618 | { | |
619 | return sprintf(buf, "%s\n", regulator_opmode_to_str(mode)); | |
414c70cb LG |
620 | } |
621 | ||
4fca9545 DB |
622 | static ssize_t regulator_opmode_show(struct device *dev, |
623 | struct device_attribute *attr, char *buf) | |
414c70cb | 624 | { |
a5766f11 | 625 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 626 | |
4fca9545 DB |
627 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
628 | } | |
7ad68e2f | 629 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
630 | |
631 | static ssize_t regulator_print_state(char *buf, int state) | |
632 | { | |
414c70cb LG |
633 | if (state > 0) |
634 | return sprintf(buf, "enabled\n"); | |
635 | else if (state == 0) | |
636 | return sprintf(buf, "disabled\n"); | |
637 | else | |
638 | return sprintf(buf, "unknown\n"); | |
639 | } | |
640 | ||
4fca9545 DB |
641 | static ssize_t regulator_state_show(struct device *dev, |
642 | struct device_attribute *attr, char *buf) | |
643 | { | |
644 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
645 | ssize_t ret; |
646 | ||
66cf9a7e | 647 | regulator_lock(rdev); |
9332546f | 648 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); |
66cf9a7e | 649 | regulator_unlock(rdev); |
4fca9545 | 650 | |
9332546f | 651 | return ret; |
4fca9545 | 652 | } |
7ad68e2f | 653 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 654 | |
853116a1 DB |
655 | static ssize_t regulator_status_show(struct device *dev, |
656 | struct device_attribute *attr, char *buf) | |
657 | { | |
658 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
659 | int status; | |
660 | char *label; | |
661 | ||
662 | status = rdev->desc->ops->get_status(rdev); | |
663 | if (status < 0) | |
664 | return status; | |
665 | ||
666 | switch (status) { | |
667 | case REGULATOR_STATUS_OFF: | |
668 | label = "off"; | |
669 | break; | |
670 | case REGULATOR_STATUS_ON: | |
671 | label = "on"; | |
672 | break; | |
673 | case REGULATOR_STATUS_ERROR: | |
674 | label = "error"; | |
675 | break; | |
676 | case REGULATOR_STATUS_FAST: | |
677 | label = "fast"; | |
678 | break; | |
679 | case REGULATOR_STATUS_NORMAL: | |
680 | label = "normal"; | |
681 | break; | |
682 | case REGULATOR_STATUS_IDLE: | |
683 | label = "idle"; | |
684 | break; | |
685 | case REGULATOR_STATUS_STANDBY: | |
686 | label = "standby"; | |
687 | break; | |
f59c8f9f MB |
688 | case REGULATOR_STATUS_BYPASS: |
689 | label = "bypass"; | |
690 | break; | |
1beaf762 KG |
691 | case REGULATOR_STATUS_UNDEFINED: |
692 | label = "undefined"; | |
693 | break; | |
853116a1 DB |
694 | default: |
695 | return -ERANGE; | |
696 | } | |
697 | ||
698 | return sprintf(buf, "%s\n", label); | |
699 | } | |
700 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
701 | ||
414c70cb LG |
702 | static ssize_t regulator_min_uA_show(struct device *dev, |
703 | struct device_attribute *attr, char *buf) | |
704 | { | |
a5766f11 | 705 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
706 | |
707 | if (!rdev->constraints) | |
708 | return sprintf(buf, "constraint not defined\n"); | |
709 | ||
710 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
711 | } | |
7ad68e2f | 712 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
713 | |
714 | static ssize_t regulator_max_uA_show(struct device *dev, | |
715 | struct device_attribute *attr, char *buf) | |
716 | { | |
a5766f11 | 717 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
718 | |
719 | if (!rdev->constraints) | |
720 | return sprintf(buf, "constraint not defined\n"); | |
721 | ||
722 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
723 | } | |
7ad68e2f | 724 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
725 | |
726 | static ssize_t regulator_min_uV_show(struct device *dev, | |
727 | struct device_attribute *attr, char *buf) | |
728 | { | |
a5766f11 | 729 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
730 | |
731 | if (!rdev->constraints) | |
732 | return sprintf(buf, "constraint not defined\n"); | |
733 | ||
734 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
735 | } | |
7ad68e2f | 736 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
737 | |
738 | static ssize_t regulator_max_uV_show(struct device *dev, | |
739 | struct device_attribute *attr, char *buf) | |
740 | { | |
a5766f11 | 741 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
742 | |
743 | if (!rdev->constraints) | |
744 | return sprintf(buf, "constraint not defined\n"); | |
745 | ||
746 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
747 | } | |
7ad68e2f | 748 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
749 | |
750 | static ssize_t regulator_total_uA_show(struct device *dev, | |
751 | struct device_attribute *attr, char *buf) | |
752 | { | |
a5766f11 | 753 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
754 | struct regulator *regulator; |
755 | int uA = 0; | |
756 | ||
66cf9a7e | 757 | regulator_lock(rdev); |
5451781d DA |
758 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
759 | if (regulator->enable_count) | |
760 | uA += regulator->uA_load; | |
761 | } | |
66cf9a7e | 762 | regulator_unlock(rdev); |
414c70cb LG |
763 | return sprintf(buf, "%d\n", uA); |
764 | } | |
7ad68e2f | 765 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 766 | |
587cea27 GKH |
767 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
768 | char *buf) | |
414c70cb | 769 | { |
a5766f11 | 770 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
771 | return sprintf(buf, "%d\n", rdev->use_count); |
772 | } | |
587cea27 | 773 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 774 | |
587cea27 GKH |
775 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
776 | char *buf) | |
414c70cb | 777 | { |
a5766f11 | 778 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
779 | |
780 | switch (rdev->desc->type) { | |
781 | case REGULATOR_VOLTAGE: | |
782 | return sprintf(buf, "voltage\n"); | |
783 | case REGULATOR_CURRENT: | |
784 | return sprintf(buf, "current\n"); | |
785 | } | |
786 | return sprintf(buf, "unknown\n"); | |
787 | } | |
587cea27 | 788 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
789 | |
790 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
791 | struct device_attribute *attr, char *buf) | |
792 | { | |
a5766f11 | 793 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 794 | |
414c70cb LG |
795 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
796 | } | |
7ad68e2f DB |
797 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
798 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
799 | |
800 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
801 | struct device_attribute *attr, char *buf) | |
802 | { | |
a5766f11 | 803 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 804 | |
414c70cb LG |
805 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
806 | } | |
7ad68e2f DB |
807 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
808 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
809 | |
810 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
811 | struct device_attribute *attr, char *buf) | |
812 | { | |
a5766f11 | 813 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 814 | |
414c70cb LG |
815 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
816 | } | |
7ad68e2f DB |
817 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
818 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 819 | |
414c70cb LG |
820 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
821 | struct device_attribute *attr, char *buf) | |
822 | { | |
a5766f11 | 823 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 824 | |
4fca9545 DB |
825 | return regulator_print_opmode(buf, |
826 | rdev->constraints->state_mem.mode); | |
414c70cb | 827 | } |
7ad68e2f DB |
828 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
829 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
830 | |
831 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
832 | struct device_attribute *attr, char *buf) | |
833 | { | |
a5766f11 | 834 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 835 | |
4fca9545 DB |
836 | return regulator_print_opmode(buf, |
837 | rdev->constraints->state_disk.mode); | |
414c70cb | 838 | } |
7ad68e2f DB |
839 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
840 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
841 | |
842 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
843 | struct device_attribute *attr, char *buf) | |
844 | { | |
a5766f11 | 845 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 846 | |
4fca9545 DB |
847 | return regulator_print_opmode(buf, |
848 | rdev->constraints->state_standby.mode); | |
414c70cb | 849 | } |
7ad68e2f DB |
850 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
851 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
852 | |
853 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
854 | struct device_attribute *attr, char *buf) | |
855 | { | |
a5766f11 | 856 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 857 | |
4fca9545 DB |
858 | return regulator_print_state(buf, |
859 | rdev->constraints->state_mem.enabled); | |
414c70cb | 860 | } |
7ad68e2f DB |
861 | static DEVICE_ATTR(suspend_mem_state, 0444, |
862 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
863 | |
864 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
865 | struct device_attribute *attr, char *buf) | |
866 | { | |
a5766f11 | 867 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 868 | |
4fca9545 DB |
869 | return regulator_print_state(buf, |
870 | rdev->constraints->state_disk.enabled); | |
414c70cb | 871 | } |
7ad68e2f DB |
872 | static DEVICE_ATTR(suspend_disk_state, 0444, |
873 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
874 | |
875 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
876 | struct device_attribute *attr, char *buf) | |
877 | { | |
a5766f11 | 878 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 879 | |
4fca9545 DB |
880 | return regulator_print_state(buf, |
881 | rdev->constraints->state_standby.enabled); | |
414c70cb | 882 | } |
7ad68e2f DB |
883 | static DEVICE_ATTR(suspend_standby_state, 0444, |
884 | regulator_suspend_standby_state_show, NULL); | |
885 | ||
f59c8f9f MB |
886 | static ssize_t regulator_bypass_show(struct device *dev, |
887 | struct device_attribute *attr, char *buf) | |
888 | { | |
889 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
890 | const char *report; | |
891 | bool bypass; | |
892 | int ret; | |
893 | ||
894 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
895 | ||
896 | if (ret != 0) | |
897 | report = "unknown"; | |
898 | else if (bypass) | |
899 | report = "enabled"; | |
900 | else | |
901 | report = "disabled"; | |
902 | ||
903 | return sprintf(buf, "%s\n", report); | |
904 | } | |
905 | static DEVICE_ATTR(bypass, 0444, | |
906 | regulator_bypass_show, NULL); | |
bc558a60 | 907 | |
414c70cb LG |
908 | /* Calculate the new optimum regulator operating mode based on the new total |
909 | * consumer load. All locks held by caller */ | |
8460ef38 | 910 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
911 | { |
912 | struct regulator *sibling; | |
913 | int current_uA = 0, output_uV, input_uV, err; | |
914 | unsigned int mode; | |
915 | ||
8460ef38 BA |
916 | /* |
917 | * first check to see if we can set modes at all, otherwise just | |
918 | * tell the consumer everything is OK. | |
919 | */ | |
74a569ee MG |
920 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) { |
921 | rdev_dbg(rdev, "DRMS operation not allowed\n"); | |
8460ef38 | 922 | return 0; |
74a569ee | 923 | } |
8460ef38 | 924 | |
8f4490e0 BA |
925 | if (!rdev->desc->ops->get_optimum_mode && |
926 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
927 | return 0; |
928 | ||
8f4490e0 BA |
929 | if (!rdev->desc->ops->set_mode && |
930 | !rdev->desc->ops->set_load) | |
8460ef38 | 931 | return -EINVAL; |
414c70cb | 932 | |
414c70cb | 933 | /* calc total requested load */ |
5451781d DA |
934 | list_for_each_entry(sibling, &rdev->consumer_list, list) { |
935 | if (sibling->enable_count) | |
936 | current_uA += sibling->uA_load; | |
937 | } | |
414c70cb | 938 | |
22a10bca SB |
939 | current_uA += rdev->constraints->system_load; |
940 | ||
8f4490e0 BA |
941 | if (rdev->desc->ops->set_load) { |
942 | /* set the optimum mode for our new total regulator load */ | |
943 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
944 | if (err < 0) | |
945 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
946 | } else { | |
57776617 | 947 | /* get output voltage */ |
d22b85a1 | 948 | output_uV = regulator_get_voltage_rdev(rdev); |
57776617 JP |
949 | if (output_uV <= 0) { |
950 | rdev_err(rdev, "invalid output voltage found\n"); | |
951 | return -EINVAL; | |
952 | } | |
953 | ||
954 | /* get input voltage */ | |
955 | input_uV = 0; | |
956 | if (rdev->supply) | |
957 | input_uV = regulator_get_voltage(rdev->supply); | |
958 | if (input_uV <= 0) | |
959 | input_uV = rdev->constraints->input_uV; | |
960 | if (input_uV <= 0) { | |
961 | rdev_err(rdev, "invalid input voltage found\n"); | |
962 | return -EINVAL; | |
963 | } | |
964 | ||
8f4490e0 BA |
965 | /* now get the optimum mode for our new total regulator load */ |
966 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
967 | output_uV, current_uA); | |
968 | ||
969 | /* check the new mode is allowed */ | |
970 | err = regulator_mode_constrain(rdev, &mode); | |
971 | if (err < 0) { | |
972 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
973 | current_uA, input_uV, output_uV); | |
974 | return err; | |
975 | } | |
414c70cb | 976 | |
8f4490e0 BA |
977 | err = rdev->desc->ops->set_mode(rdev, mode); |
978 | if (err < 0) | |
979 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
980 | } |
981 | ||
8460ef38 | 982 | return err; |
414c70cb LG |
983 | } |
984 | ||
985 | static int suspend_set_state(struct regulator_dev *rdev, | |
f7efad10 | 986 | suspend_state_t state) |
414c70cb LG |
987 | { |
988 | int ret = 0; | |
f7efad10 CZ |
989 | struct regulator_state *rstate; |
990 | ||
991 | rstate = regulator_get_suspend_state(rdev, state); | |
992 | if (rstate == NULL) | |
57a0dd18 | 993 | return 0; |
638f85c5 | 994 | |
48f1b4ef | 995 | /* If we have no suspend mode configuration don't set anything; |
8ac0e95d AL |
996 | * only warn if the driver implements set_suspend_voltage or |
997 | * set_suspend_mode callback. | |
638f85c5 | 998 | */ |
72069f99 CZ |
999 | if (rstate->enabled != ENABLE_IN_SUSPEND && |
1000 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
8ac0e95d AL |
1001 | if (rdev->desc->ops->set_suspend_voltage || |
1002 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 1003 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
1004 | return 0; |
1005 | } | |
1006 | ||
72069f99 CZ |
1007 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
1008 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 1009 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
1010 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
1011 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 1012 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
1013 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
1014 | ret = 0; | |
1015 | ||
414c70cb | 1016 | if (ret < 0) { |
5da84fd9 | 1017 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
1018 | return ret; |
1019 | } | |
1020 | ||
1021 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
1022 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
1023 | if (ret < 0) { | |
5da84fd9 | 1024 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
1025 | return ret; |
1026 | } | |
1027 | } | |
1028 | ||
1029 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
1030 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
1031 | if (ret < 0) { | |
5da84fd9 | 1032 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
1033 | return ret; |
1034 | } | |
1035 | } | |
414c70cb | 1036 | |
f7efad10 | 1037 | return ret; |
414c70cb LG |
1038 | } |
1039 | ||
1040 | static void print_constraints(struct regulator_dev *rdev) | |
1041 | { | |
1042 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 1043 | char buf[160] = ""; |
5751a99f | 1044 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
1045 | int count = 0; |
1046 | int ret; | |
414c70cb | 1047 | |
8f031b48 | 1048 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 1049 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
1050 | count += scnprintf(buf + count, len - count, "%d mV ", |
1051 | constraints->min_uV / 1000); | |
414c70cb | 1052 | else |
5751a99f SW |
1053 | count += scnprintf(buf + count, len - count, |
1054 | "%d <--> %d mV ", | |
1055 | constraints->min_uV / 1000, | |
1056 | constraints->max_uV / 1000); | |
8f031b48 MB |
1057 | } |
1058 | ||
1059 | if (!constraints->min_uV || | |
1060 | constraints->min_uV != constraints->max_uV) { | |
d22b85a1 | 1061 | ret = regulator_get_voltage_rdev(rdev); |
8f031b48 | 1062 | if (ret > 0) |
5751a99f SW |
1063 | count += scnprintf(buf + count, len - count, |
1064 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
1065 | } |
1066 | ||
bf5892a8 | 1067 | if (constraints->uV_offset) |
5751a99f SW |
1068 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
1069 | constraints->uV_offset / 1000); | |
bf5892a8 | 1070 | |
8f031b48 | 1071 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 1072 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
1073 | count += scnprintf(buf + count, len - count, "%d mA ", |
1074 | constraints->min_uA / 1000); | |
414c70cb | 1075 | else |
5751a99f SW |
1076 | count += scnprintf(buf + count, len - count, |
1077 | "%d <--> %d mA ", | |
1078 | constraints->min_uA / 1000, | |
1079 | constraints->max_uA / 1000); | |
8f031b48 MB |
1080 | } |
1081 | ||
1082 | if (!constraints->min_uA || | |
1083 | constraints->min_uA != constraints->max_uA) { | |
1084 | ret = _regulator_get_current_limit(rdev); | |
1085 | if (ret > 0) | |
5751a99f SW |
1086 | count += scnprintf(buf + count, len - count, |
1087 | "at %d mA ", ret / 1000); | |
414c70cb | 1088 | } |
8f031b48 | 1089 | |
414c70cb | 1090 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 1091 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 1092 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 1093 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 1094 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 1095 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 1096 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 1097 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 1098 | |
215b8b05 | 1099 | if (!count) |
5751a99f | 1100 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 1101 | |
194dbaef | 1102 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
1103 | |
1104 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 1105 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
1106 | rdev_warn(rdev, |
1107 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
1108 | } |
1109 | ||
e79055d6 | 1110 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 1111 | struct regulation_constraints *constraints) |
a5766f11 | 1112 | { |
272e2315 | 1113 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
1114 | int ret; |
1115 | ||
1116 | /* do we need to apply the constraint voltage */ | |
1117 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
1118 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
1119 | int target_min, target_max; | |
d22b85a1 | 1120 | int current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1121 | |
1122 | if (current_uV == -ENOTRECOVERABLE) { | |
48f1b4ef | 1123 | /* This regulator can't be read and must be initialized */ |
84b3a7c9 DA |
1124 | rdev_info(rdev, "Setting %d-%duV\n", |
1125 | rdev->constraints->min_uV, | |
1126 | rdev->constraints->max_uV); | |
1127 | _regulator_do_set_voltage(rdev, | |
1128 | rdev->constraints->min_uV, | |
1129 | rdev->constraints->max_uV); | |
d22b85a1 | 1130 | current_uV = regulator_get_voltage_rdev(rdev); |
84b3a7c9 DA |
1131 | } |
1132 | ||
064d5cd1 | 1133 | if (current_uV < 0) { |
69d58839 NM |
1134 | rdev_err(rdev, |
1135 | "failed to get the current voltage(%d)\n", | |
1136 | current_uV); | |
064d5cd1 AB |
1137 | return current_uV; |
1138 | } | |
fa93fd4e MB |
1139 | |
1140 | /* | |
1141 | * If we're below the minimum voltage move up to the | |
1142 | * minimum voltage, if we're above the maximum voltage | |
1143 | * then move down to the maximum. | |
1144 | */ | |
1145 | target_min = current_uV; | |
1146 | target_max = current_uV; | |
1147 | ||
1148 | if (current_uV < rdev->constraints->min_uV) { | |
1149 | target_min = rdev->constraints->min_uV; | |
1150 | target_max = rdev->constraints->min_uV; | |
1151 | } | |
1152 | ||
1153 | if (current_uV > rdev->constraints->max_uV) { | |
1154 | target_min = rdev->constraints->max_uV; | |
1155 | target_max = rdev->constraints->max_uV; | |
1156 | } | |
1157 | ||
1158 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
1159 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
1160 | current_uV, target_min, target_max); | |
064d5cd1 | 1161 | ret = _regulator_do_set_voltage( |
fa93fd4e | 1162 | rdev, target_min, target_max); |
064d5cd1 AB |
1163 | if (ret < 0) { |
1164 | rdev_err(rdev, | |
fa93fd4e MB |
1165 | "failed to apply %d-%duV constraint(%d)\n", |
1166 | target_min, target_max, ret); | |
064d5cd1 AB |
1167 | return ret; |
1168 | } | |
75790251 | 1169 | } |
af5866c9 | 1170 | } |
e06f5b4f | 1171 | |
4367cfdc DB |
1172 | /* constrain machine-level voltage specs to fit |
1173 | * the actual range supported by this regulator. | |
1174 | */ | |
1175 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
1176 | int count = rdev->desc->n_voltages; | |
1177 | int i; | |
1178 | int min_uV = INT_MAX; | |
1179 | int max_uV = INT_MIN; | |
1180 | int cmin = constraints->min_uV; | |
1181 | int cmax = constraints->max_uV; | |
1182 | ||
3e590918 MB |
1183 | /* it's safe to autoconfigure fixed-voltage supplies |
1184 | and the constraints are used by list_voltage. */ | |
4367cfdc | 1185 | if (count == 1 && !cmin) { |
3e590918 | 1186 | cmin = 1; |
4367cfdc | 1187 | cmax = INT_MAX; |
3e590918 MB |
1188 | constraints->min_uV = cmin; |
1189 | constraints->max_uV = cmax; | |
4367cfdc DB |
1190 | } |
1191 | ||
3e2b9abd MB |
1192 | /* voltage constraints are optional */ |
1193 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 1194 | return 0; |
3e2b9abd | 1195 | |
4367cfdc | 1196 | /* else require explicit machine-level constraints */ |
3e2b9abd | 1197 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 1198 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 1199 | return -EINVAL; |
4367cfdc DB |
1200 | } |
1201 | ||
6d30fc51 CM |
1202 | /* no need to loop voltages if range is continuous */ |
1203 | if (rdev->desc->continuous_voltage_range) | |
1204 | return 0; | |
1205 | ||
4367cfdc DB |
1206 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ |
1207 | for (i = 0; i < count; i++) { | |
1208 | int value; | |
1209 | ||
1210 | value = ops->list_voltage(rdev, i); | |
1211 | if (value <= 0) | |
1212 | continue; | |
1213 | ||
1214 | /* maybe adjust [min_uV..max_uV] */ | |
1215 | if (value >= cmin && value < min_uV) | |
1216 | min_uV = value; | |
1217 | if (value <= cmax && value > max_uV) | |
1218 | max_uV = value; | |
1219 | } | |
1220 | ||
1221 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
1222 | if (max_uV < min_uV) { | |
fff15bef MB |
1223 | rdev_err(rdev, |
1224 | "unsupportable voltage constraints %u-%uuV\n", | |
1225 | min_uV, max_uV); | |
e79055d6 | 1226 | return -EINVAL; |
4367cfdc DB |
1227 | } |
1228 | ||
1229 | /* use regulator's subset of machine constraints */ | |
1230 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
1231 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
1232 | constraints->min_uV, min_uV); | |
4367cfdc DB |
1233 | constraints->min_uV = min_uV; |
1234 | } | |
1235 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
1236 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
1237 | constraints->max_uV, max_uV); | |
4367cfdc DB |
1238 | constraints->max_uV = max_uV; |
1239 | } | |
1240 | } | |
1241 | ||
e79055d6 MB |
1242 | return 0; |
1243 | } | |
1244 | ||
f8c1700d LD |
1245 | static int machine_constraints_current(struct regulator_dev *rdev, |
1246 | struct regulation_constraints *constraints) | |
1247 | { | |
272e2315 | 1248 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1249 | int ret; |
1250 | ||
1251 | if (!constraints->min_uA && !constraints->max_uA) | |
1252 | return 0; | |
1253 | ||
1254 | if (constraints->min_uA > constraints->max_uA) { | |
1255 | rdev_err(rdev, "Invalid current constraints\n"); | |
1256 | return -EINVAL; | |
1257 | } | |
1258 | ||
1259 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1260 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /* Set regulator current in constraints range */ | |
1265 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1266 | constraints->max_uA); | |
1267 | if (ret < 0) { | |
1268 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
30c21971 MP |
1275 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1276 | ||
e79055d6 MB |
1277 | /** |
1278 | * set_machine_constraints - sets regulator constraints | |
1279 | * @rdev: regulator source | |
1280 | * @constraints: constraints to apply | |
1281 | * | |
1282 | * Allows platform initialisation code to define and constrain | |
1283 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1284 | * Constraints *must* be set by platform code in order for some | |
1285 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1286 | * set_mode. | |
1287 | */ | |
1288 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1289 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1290 | { |
1291 | int ret = 0; | |
272e2315 | 1292 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1293 | |
9a8f5e07 MB |
1294 | if (constraints) |
1295 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1296 | GFP_KERNEL); | |
1297 | else | |
1298 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1299 | GFP_KERNEL); | |
f8c12fe3 MB |
1300 | if (!rdev->constraints) |
1301 | return -ENOMEM; | |
af5866c9 | 1302 | |
f8c12fe3 | 1303 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1304 | if (ret != 0) |
6333ef46 | 1305 | return ret; |
e79055d6 | 1306 | |
f8c1700d | 1307 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1308 | if (ret != 0) |
6333ef46 | 1309 | return ret; |
e79055d6 | 1310 | |
36e4f839 SB |
1311 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1312 | ret = ops->set_input_current_limit(rdev, | |
1313 | rdev->constraints->ilim_uA); | |
1314 | if (ret < 0) { | |
1315 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1316 | return ret; |
36e4f839 SB |
1317 | } |
1318 | } | |
1319 | ||
a5766f11 | 1320 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1321 | if (rdev->constraints->initial_state) { |
f7efad10 | 1322 | ret = suspend_set_state(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1323 | if (ret < 0) { |
5da84fd9 | 1324 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1325 | return ret; |
e06f5b4f MB |
1326 | } |
1327 | } | |
a5766f11 | 1328 | |
9a8f5e07 | 1329 | if (rdev->constraints->initial_mode) { |
a308466c | 1330 | if (!ops->set_mode) { |
5da84fd9 | 1331 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1332 | return -EINVAL; |
a308466c MB |
1333 | } |
1334 | ||
f8c12fe3 | 1335 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1336 | if (ret < 0) { |
5da84fd9 | 1337 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1338 | return ret; |
a308466c | 1339 | } |
fa94e48e DA |
1340 | } else if (rdev->constraints->system_load) { |
1341 | /* | |
1342 | * We'll only apply the initial system load if an | |
1343 | * initial mode wasn't specified. | |
1344 | */ | |
1345 | drms_uA_update(rdev); | |
a308466c MB |
1346 | } |
1347 | ||
1653ccf4 YSB |
1348 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1349 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1350 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1351 | if (ret < 0) { | |
1352 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1353 | return ret; |
6f0b2c69 YSB |
1354 | } |
1355 | } | |
1356 | ||
23c779b9 SB |
1357 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1358 | ret = ops->set_pull_down(rdev); | |
1359 | if (ret < 0) { | |
1360 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1361 | return ret; |
23c779b9 SB |
1362 | } |
1363 | } | |
1364 | ||
57f66b78 SB |
1365 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1366 | ret = ops->set_soft_start(rdev); | |
1367 | if (ret < 0) { | |
1368 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1369 | return ret; |
57f66b78 SB |
1370 | } |
1371 | } | |
1372 | ||
3a003bae SB |
1373 | if (rdev->constraints->over_current_protection |
1374 | && ops->set_over_current_protection) { | |
1375 | ret = ops->set_over_current_protection(rdev); | |
1376 | if (ret < 0) { | |
1377 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1378 | return ret; |
3a003bae SB |
1379 | } |
1380 | } | |
1381 | ||
670666b9 LD |
1382 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1383 | bool ad_state = (rdev->constraints->active_discharge == | |
1384 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1385 | ||
1386 | ret = ops->set_active_discharge(rdev, ad_state); | |
1387 | if (ret < 0) { | |
1388 | rdev_err(rdev, "failed to set active discharge\n"); | |
1389 | return ret; | |
1390 | } | |
1391 | } | |
1392 | ||
2bb16663 OS |
1393 | /* If the constraints say the regulator should be on at this point |
1394 | * and we have control then make sure it is enabled. | |
1395 | */ | |
1396 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { | |
05f224ca DA |
1397 | if (rdev->supply) { |
1398 | ret = regulator_enable(rdev->supply); | |
1399 | if (ret < 0) { | |
1400 | _regulator_put(rdev->supply); | |
1401 | rdev->supply = NULL; | |
1402 | return ret; | |
1403 | } | |
1404 | } | |
1405 | ||
2bb16663 OS |
1406 | ret = _regulator_do_enable(rdev); |
1407 | if (ret < 0 && ret != -EINVAL) { | |
1408 | rdev_err(rdev, "failed to enable\n"); | |
1409 | return ret; | |
1410 | } | |
089b3f61 PP |
1411 | |
1412 | if (rdev->constraints->always_on) | |
1413 | rdev->use_count++; | |
2bb16663 OS |
1414 | } |
1415 | ||
a5766f11 | 1416 | print_constraints(rdev); |
1a6958e7 | 1417 | return 0; |
a5766f11 LG |
1418 | } |
1419 | ||
1420 | /** | |
1421 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1422 | * @rdev: regulator name |
1423 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1424 | * |
1425 | * Called by platform initialisation code to set the supply regulator for this | |
1426 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1427 | * core if it's child is enabled. | |
1428 | */ | |
1429 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1430 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1431 | { |
1432 | int err; | |
1433 | ||
3801b86a MB |
1434 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1435 | ||
e2c09ae7 JMC |
1436 | if (!try_module_get(supply_rdev->owner)) |
1437 | return -ENODEV; | |
1438 | ||
3801b86a | 1439 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1440 | if (rdev->supply == NULL) { |
1441 | err = -ENOMEM; | |
3801b86a | 1442 | return err; |
a5766f11 | 1443 | } |
57ad526a | 1444 | supply_rdev->open_count++; |
3801b86a MB |
1445 | |
1446 | return 0; | |
a5766f11 LG |
1447 | } |
1448 | ||
1449 | /** | |
06c63f93 | 1450 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1451 | * @rdev: regulator source |
40f9244f | 1452 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1453 | * @supply: symbolic name for supply |
a5766f11 LG |
1454 | * |
1455 | * Allows platform initialisation code to map physical regulator | |
1456 | * sources to symbolic names for supplies for use by devices. Devices | |
1457 | * should use these symbolic names to request regulators, avoiding the | |
1458 | * need to provide board-specific regulator names as platform data. | |
1459 | */ | |
1460 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1461 | const char *consumer_dev_name, |
1462 | const char *supply) | |
a5766f11 LG |
1463 | { |
1464 | struct regulator_map *node; | |
9ed2099e | 1465 | int has_dev; |
a5766f11 LG |
1466 | |
1467 | if (supply == NULL) | |
1468 | return -EINVAL; | |
1469 | ||
9ed2099e MB |
1470 | if (consumer_dev_name != NULL) |
1471 | has_dev = 1; | |
1472 | else | |
1473 | has_dev = 0; | |
1474 | ||
6001e13c | 1475 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1476 | if (node->dev_name && consumer_dev_name) { |
1477 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1478 | continue; | |
1479 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1480 | continue; |
23b5cc2a JN |
1481 | } |
1482 | ||
6001e13c DB |
1483 | if (strcmp(node->supply, supply) != 0) |
1484 | continue; | |
1485 | ||
737f360d MB |
1486 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1487 | consumer_dev_name, | |
1488 | dev_name(&node->regulator->dev), | |
1489 | node->regulator->desc->name, | |
1490 | supply, | |
1491 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1492 | return -EBUSY; |
1493 | } | |
1494 | ||
9ed2099e | 1495 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1496 | if (node == NULL) |
1497 | return -ENOMEM; | |
1498 | ||
1499 | node->regulator = rdev; | |
a5766f11 LG |
1500 | node->supply = supply; |
1501 | ||
9ed2099e MB |
1502 | if (has_dev) { |
1503 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1504 | if (node->dev_name == NULL) { | |
1505 | kfree(node); | |
1506 | return -ENOMEM; | |
1507 | } | |
40f9244f MB |
1508 | } |
1509 | ||
a5766f11 LG |
1510 | list_add(&node->list, ®ulator_map_list); |
1511 | return 0; | |
1512 | } | |
1513 | ||
0f1d747b MR |
1514 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1515 | { | |
1516 | struct regulator_map *node, *n; | |
1517 | ||
1518 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1519 | if (rdev == node->regulator) { | |
1520 | list_del(&node->list); | |
40f9244f | 1521 | kfree(node->dev_name); |
0f1d747b | 1522 | kfree(node); |
0f1d747b MR |
1523 | } |
1524 | } | |
1525 | } | |
1526 | ||
2d80a91b RF |
1527 | #ifdef CONFIG_DEBUG_FS |
1528 | static ssize_t constraint_flags_read_file(struct file *file, | |
1529 | char __user *user_buf, | |
1530 | size_t count, loff_t *ppos) | |
1531 | { | |
1532 | const struct regulator *regulator = file->private_data; | |
1533 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1534 | char *buf; | |
1535 | ssize_t ret; | |
1536 | ||
1537 | if (!c) | |
1538 | return 0; | |
1539 | ||
1540 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1541 | if (!buf) | |
1542 | return -ENOMEM; | |
1543 | ||
1544 | ret = snprintf(buf, PAGE_SIZE, | |
1545 | "always_on: %u\n" | |
1546 | "boot_on: %u\n" | |
1547 | "apply_uV: %u\n" | |
1548 | "ramp_disable: %u\n" | |
1549 | "soft_start: %u\n" | |
1550 | "pull_down: %u\n" | |
1551 | "over_current_protection: %u\n", | |
1552 | c->always_on, | |
1553 | c->boot_on, | |
1554 | c->apply_uV, | |
1555 | c->ramp_disable, | |
1556 | c->soft_start, | |
1557 | c->pull_down, | |
1558 | c->over_current_protection); | |
1559 | ||
1560 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1561 | kfree(buf); | |
1562 | ||
1563 | return ret; | |
1564 | } | |
1565 | ||
1566 | #endif | |
1567 | ||
1568 | static const struct file_operations constraint_flags_fops = { | |
1569 | #ifdef CONFIG_DEBUG_FS | |
1570 | .open = simple_open, | |
1571 | .read = constraint_flags_read_file, | |
1572 | .llseek = default_llseek, | |
1573 | #endif | |
1574 | }; | |
1575 | ||
f5726ae3 | 1576 | #define REG_STR_SIZE 64 |
414c70cb LG |
1577 | |
1578 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1579 | struct device *dev, | |
1580 | const char *supply_name) | |
1581 | { | |
1582 | struct regulator *regulator; | |
1583 | char buf[REG_STR_SIZE]; | |
1584 | int err, size; | |
1585 | ||
1586 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1587 | if (regulator == NULL) | |
1588 | return NULL; | |
1589 | ||
66cf9a7e | 1590 | regulator_lock(rdev); |
414c70cb LG |
1591 | regulator->rdev = rdev; |
1592 | list_add(®ulator->list, &rdev->consumer_list); | |
1593 | ||
1594 | if (dev) { | |
e2c98eaf SG |
1595 | regulator->dev = dev; |
1596 | ||
222cc7b1 | 1597 | /* Add a link to the device sysfs entry */ |
b7cd1b13 BG |
1598 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", |
1599 | dev->kobj.name, supply_name); | |
414c70cb | 1600 | if (size >= REG_STR_SIZE) |
222cc7b1 | 1601 | goto overflow_err; |
414c70cb LG |
1602 | |
1603 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1604 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1605 | goto overflow_err; |
414c70cb | 1606 | |
ff268b56 | 1607 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1608 | buf); |
1609 | if (err) { | |
ff268b56 | 1610 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1611 | dev->kobj.name, err); |
222cc7b1 | 1612 | /* non-fatal */ |
414c70cb | 1613 | } |
5de70519 | 1614 | } else { |
0630b614 | 1615 | regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL); |
5de70519 | 1616 | if (regulator->supply_name == NULL) |
222cc7b1 | 1617 | goto overflow_err; |
5de70519 MB |
1618 | } |
1619 | ||
5de70519 MB |
1620 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1621 | rdev->debugfs); | |
24751434 | 1622 | if (!regulator->debugfs) { |
ad3a942b | 1623 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1624 | } else { |
1625 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1626 | ®ulator->uA_load); | |
1627 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1628 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1629 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1630 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1631 | debugfs_create_file("constraint_flags", 0444, |
1632 | regulator->debugfs, regulator, | |
1633 | &constraint_flags_fops); | |
414c70cb | 1634 | } |
5de70519 | 1635 | |
6492bc1b MB |
1636 | /* |
1637 | * Check now if the regulator is an always on regulator - if | |
1638 | * it is then we don't need to do nearly so much work for | |
1639 | * enable/disable calls. | |
1640 | */ | |
8a34e979 | 1641 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1642 | _regulator_is_enabled(rdev)) |
1643 | regulator->always_on = true; | |
1644 | ||
66cf9a7e | 1645 | regulator_unlock(rdev); |
414c70cb | 1646 | return regulator; |
414c70cb LG |
1647 | overflow_err: |
1648 | list_del(®ulator->list); | |
1649 | kfree(regulator); | |
66cf9a7e | 1650 | regulator_unlock(rdev); |
414c70cb LG |
1651 | return NULL; |
1652 | } | |
1653 | ||
31aae2be MB |
1654 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1655 | { | |
00c877c6 LD |
1656 | if (rdev->constraints && rdev->constraints->enable_time) |
1657 | return rdev->constraints->enable_time; | |
68ce3a44 AL |
1658 | if (rdev->desc->ops->enable_time) |
1659 | return rdev->desc->ops->enable_time(rdev); | |
1660 | return rdev->desc->enable_time; | |
31aae2be MB |
1661 | } |
1662 | ||
a06ccd9c CK |
1663 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1664 | struct device *dev, const char *supply) | |
1665 | { | |
1666 | struct regulator_supply_alias *map; | |
1667 | ||
1668 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1669 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1670 | return map; | |
1671 | ||
1672 | return NULL; | |
1673 | } | |
1674 | ||
1675 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1676 | { | |
1677 | struct regulator_supply_alias *map; | |
1678 | ||
1679 | map = regulator_find_supply_alias(*dev, *supply); | |
1680 | if (map) { | |
1681 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1682 | *supply, map->alias_supply, | |
1683 | dev_name(map->alias_dev)); | |
1684 | *dev = map->alias_dev; | |
1685 | *supply = map->alias_supply; | |
1686 | } | |
1687 | } | |
1688 | ||
85f3b431 TV |
1689 | static int regulator_match(struct device *dev, const void *data) |
1690 | { | |
1691 | struct regulator_dev *r = dev_to_rdev(dev); | |
1692 | ||
1693 | return strcmp(rdev_get_name(r), data) == 0; | |
1694 | } | |
1695 | ||
1696 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1697 | { | |
1698 | struct device *dev; | |
1699 | ||
1700 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1701 | ||
1702 | return dev ? dev_to_rdev(dev) : NULL; | |
1703 | } | |
1704 | ||
1705 | /** | |
1706 | * regulator_dev_lookup - lookup a regulator device. | |
1707 | * @dev: device for regulator "consumer". | |
1708 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1709 | * |
1710 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1711 | * @supply and with the embedded struct device refcount incremented by one. |
1712 | * The refcount must be dropped by calling put_device(). | |
1713 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1714 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1715 | * in the future. | |
85f3b431 | 1716 | */ |
69511a45 | 1717 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1718 | const char *supply) |
69511a45 | 1719 | { |
06217197 | 1720 | struct regulator_dev *r = NULL; |
69511a45 | 1721 | struct device_node *node; |
576ca436 MB |
1722 | struct regulator_map *map; |
1723 | const char *devname = NULL; | |
69511a45 | 1724 | |
a06ccd9c CK |
1725 | regulator_supply_alias(&dev, &supply); |
1726 | ||
69511a45 RN |
1727 | /* first do a dt based lookup */ |
1728 | if (dev && dev->of_node) { | |
1729 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1730 | if (node) { |
85f3b431 TV |
1731 | r = of_find_regulator_by_node(node); |
1732 | if (r) | |
1733 | return r; | |
163478da | 1734 | |
6d191a5f | 1735 | /* |
163478da DT |
1736 | * We have a node, but there is no device. |
1737 | * assume it has not registered yet. | |
6d191a5f | 1738 | */ |
163478da | 1739 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1740 | } |
69511a45 RN |
1741 | } |
1742 | ||
1743 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1744 | if (dev) |
1745 | devname = dev_name(dev); | |
1746 | ||
85f3b431 | 1747 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1748 | list_for_each_entry(map, ®ulator_map_list, list) { |
1749 | /* If the mapping has a device set up it must match */ | |
1750 | if (map->dev_name && | |
1751 | (!devname || strcmp(map->dev_name, devname))) | |
1752 | continue; | |
1753 | ||
85f3b431 TV |
1754 | if (strcmp(map->supply, supply) == 0 && |
1755 | get_device(&map->regulator->dev)) { | |
163478da DT |
1756 | r = map->regulator; |
1757 | break; | |
85f3b431 | 1758 | } |
576ca436 | 1759 | } |
85f3b431 | 1760 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1761 | |
06217197 CK |
1762 | if (r) |
1763 | return r; | |
1764 | ||
1765 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1766 | if (r) |
1767 | return r; | |
1768 | ||
1769 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1770 | } |
1771 | ||
6261b06d BA |
1772 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1773 | { | |
1774 | struct regulator_dev *r; | |
1775 | struct device *dev = rdev->dev.parent; | |
1776 | int ret; | |
1777 | ||
48f1b4ef | 1778 | /* No supply to resolve? */ |
6261b06d BA |
1779 | if (!rdev->supply_name) |
1780 | return 0; | |
1781 | ||
1782 | /* Supply already resolved? */ | |
1783 | if (rdev->supply) | |
1784 | return 0; | |
1785 | ||
163478da DT |
1786 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1787 | if (IS_ERR(r)) { | |
1788 | ret = PTR_ERR(r); | |
1789 | ||
06423121 MB |
1790 | /* Did the lookup explicitly defer for us? */ |
1791 | if (ret == -EPROBE_DEFER) | |
1792 | return ret; | |
1793 | ||
9f7e25ed MB |
1794 | if (have_full_constraints()) { |
1795 | r = dummy_regulator_rdev; | |
85f3b431 | 1796 | get_device(&r->dev); |
9f7e25ed MB |
1797 | } else { |
1798 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1799 | rdev->supply_name, rdev->desc->name); | |
1800 | return -EPROBE_DEFER; | |
1801 | } | |
6261b06d BA |
1802 | } |
1803 | ||
66d228a2 JH |
1804 | /* |
1805 | * If the supply's parent device is not the same as the | |
1806 | * regulator's parent device, then ensure the parent device | |
1807 | * is bound before we resolve the supply, in case the parent | |
1808 | * device get probe deferred and unregisters the supply. | |
1809 | */ | |
1810 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1811 | if (!device_is_bound(r->dev.parent)) { | |
1812 | put_device(&r->dev); | |
1813 | return -EPROBE_DEFER; | |
1814 | } | |
1815 | } | |
1816 | ||
6261b06d BA |
1817 | /* Recursively resolve the supply of the supply */ |
1818 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1819 | if (ret < 0) { |
1820 | put_device(&r->dev); | |
6261b06d | 1821 | return ret; |
85f3b431 | 1822 | } |
6261b06d BA |
1823 | |
1824 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1825 | if (ret < 0) { |
1826 | put_device(&r->dev); | |
6261b06d | 1827 | return ret; |
85f3b431 | 1828 | } |
6261b06d | 1829 | |
05f224ca DA |
1830 | /* |
1831 | * In set_machine_constraints() we may have turned this regulator on | |
1832 | * but we couldn't propagate to the supply if it hadn't been resolved | |
1833 | * yet. Do it now. | |
1834 | */ | |
1835 | if (rdev->use_count) { | |
6261b06d | 1836 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1837 | if (ret < 0) { |
9f8df6ad | 1838 | _regulator_put(rdev->supply); |
8e5356a7 | 1839 | rdev->supply = NULL; |
6261b06d | 1840 | return ret; |
36a1f1b6 | 1841 | } |
6261b06d BA |
1842 | } |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
5ffbd136 | 1847 | /* Internal regulator request function */ |
a8bd42a9 DT |
1848 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1849 | enum regulator_get_type get_type) | |
414c70cb LG |
1850 | { |
1851 | struct regulator_dev *rdev; | |
7d245afa | 1852 | struct regulator *regulator; |
b59b6544 | 1853 | struct device_link *link; |
317b5684 | 1854 | int ret; |
414c70cb | 1855 | |
a8bd42a9 DT |
1856 | if (get_type >= MAX_GET_TYPE) { |
1857 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1858 | return ERR_PTR(-EINVAL); | |
1859 | } | |
1860 | ||
414c70cb | 1861 | if (id == NULL) { |
5da84fd9 | 1862 | pr_err("get() with no identifier\n"); |
043c998f | 1863 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1864 | } |
1865 | ||
163478da | 1866 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1867 | if (IS_ERR(rdev)) { |
1868 | ret = PTR_ERR(rdev); | |
1e4b545c | 1869 | |
a4d7641f DT |
1870 | /* |
1871 | * If regulator_dev_lookup() fails with error other | |
1872 | * than -ENODEV our job here is done, we simply return it. | |
1873 | */ | |
1874 | if (ret != -ENODEV) | |
1875 | return ERR_PTR(ret); | |
34abbd68 | 1876 | |
a4d7641f DT |
1877 | if (!have_full_constraints()) { |
1878 | dev_warn(dev, | |
1879 | "incomplete constraints, dummy supplies not allowed\n"); | |
1880 | return ERR_PTR(-ENODEV); | |
1881 | } | |
4ddfebd3 | 1882 | |
a4d7641f DT |
1883 | switch (get_type) { |
1884 | case NORMAL_GET: | |
1885 | /* | |
1886 | * Assume that a regulator is physically present and | |
1887 | * enabled, even if it isn't hooked up, and just | |
1888 | * provide a dummy. | |
1889 | */ | |
6e5505cf | 1890 | dev_warn(dev, "supply %s not found, using dummy regulator\n", id); |
a4d7641f DT |
1891 | rdev = dummy_regulator_rdev; |
1892 | get_device(&rdev->dev); | |
1893 | break; | |
34abbd68 | 1894 | |
a4d7641f DT |
1895 | case EXCLUSIVE_GET: |
1896 | dev_warn(dev, | |
1897 | "dummy supplies not allowed for exclusive requests\n"); | |
df561f66 | 1898 | fallthrough; |
34abbd68 | 1899 | |
a4d7641f DT |
1900 | default: |
1901 | return ERR_PTR(-ENODEV); | |
1902 | } | |
34abbd68 | 1903 | } |
34abbd68 | 1904 | |
5ffbd136 MB |
1905 | if (rdev->exclusive) { |
1906 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1907 | put_device(&rdev->dev); |
1908 | return regulator; | |
5ffbd136 MB |
1909 | } |
1910 | ||
a8bd42a9 | 1911 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1912 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1913 | put_device(&rdev->dev); |
1914 | return regulator; | |
5ffbd136 MB |
1915 | } |
1916 | ||
79d6f049 DO |
1917 | mutex_lock(®ulator_list_mutex); |
1918 | ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled); | |
1919 | mutex_unlock(®ulator_list_mutex); | |
1920 | ||
1921 | if (ret != 0) { | |
1922 | regulator = ERR_PTR(-EPROBE_DEFER); | |
1923 | put_device(&rdev->dev); | |
1924 | return regulator; | |
1925 | } | |
1926 | ||
6261b06d BA |
1927 | ret = regulator_resolve_supply(rdev); |
1928 | if (ret < 0) { | |
1929 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1930 | put_device(&rdev->dev); |
1931 | return regulator; | |
6261b06d BA |
1932 | } |
1933 | ||
85f3b431 | 1934 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1935 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1936 | put_device(&rdev->dev); |
1937 | return regulator; | |
1938 | } | |
a5766f11 | 1939 | |
414c70cb LG |
1940 | regulator = create_regulator(rdev, dev, id); |
1941 | if (regulator == NULL) { | |
1942 | regulator = ERR_PTR(-ENOMEM); | |
1943 | module_put(rdev->owner); | |
4affd79a | 1944 | put_device(&rdev->dev); |
85f3b431 | 1945 | return regulator; |
414c70cb LG |
1946 | } |
1947 | ||
5ffbd136 | 1948 | rdev->open_count++; |
a8bd42a9 | 1949 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1950 | rdev->exclusive = 1; |
1951 | ||
1952 | ret = _regulator_is_enabled(rdev); | |
1953 | if (ret > 0) | |
1954 | rdev->use_count = 1; | |
1955 | else | |
1956 | rdev->use_count = 0; | |
1957 | } | |
1958 | ||
b59b6544 SK |
1959 | link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS); |
1960 | if (!IS_ERR_OR_NULL(link)) | |
1961 | regulator->device_link = true; | |
ed1ae2dd | 1962 | |
414c70cb LG |
1963 | return regulator; |
1964 | } | |
5ffbd136 MB |
1965 | |
1966 | /** | |
1967 | * regulator_get - lookup and obtain a reference to a regulator. | |
1968 | * @dev: device for regulator "consumer" | |
1969 | * @id: Supply name or regulator ID. | |
1970 | * | |
1971 | * Returns a struct regulator corresponding to the regulator producer, | |
1972 | * or IS_ERR() condition containing errno. | |
1973 | * | |
1974 | * Use of supply names configured via regulator_set_device_supply() is | |
1975 | * strongly encouraged. It is recommended that the supply name used | |
1976 | * should match the name used for the supply and/or the relevant | |
1977 | * device pins in the datasheet. | |
1978 | */ | |
1979 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1980 | { | |
a8bd42a9 | 1981 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 1982 | } |
414c70cb LG |
1983 | EXPORT_SYMBOL_GPL(regulator_get); |
1984 | ||
5ffbd136 MB |
1985 | /** |
1986 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1987 | * @dev: device for regulator "consumer" | |
1988 | * @id: Supply name or regulator ID. | |
1989 | * | |
1990 | * Returns a struct regulator corresponding to the regulator producer, | |
1991 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1992 | * unable to obtain this regulator while this reference is held and the |
1993 | * use count for the regulator will be initialised to reflect the current | |
1994 | * state of the regulator. | |
5ffbd136 MB |
1995 | * |
1996 | * This is intended for use by consumers which cannot tolerate shared | |
1997 | * use of the regulator such as those which need to force the | |
1998 | * regulator off for correct operation of the hardware they are | |
1999 | * controlling. | |
2000 | * | |
2001 | * Use of supply names configured via regulator_set_device_supply() is | |
2002 | * strongly encouraged. It is recommended that the supply name used | |
2003 | * should match the name used for the supply and/or the relevant | |
2004 | * device pins in the datasheet. | |
2005 | */ | |
2006 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
2007 | { | |
a8bd42a9 | 2008 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
2009 | } |
2010 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
2011 | ||
de1dd9fd MB |
2012 | /** |
2013 | * regulator_get_optional - obtain optional access to a regulator. | |
2014 | * @dev: device for regulator "consumer" | |
2015 | * @id: Supply name or regulator ID. | |
2016 | * | |
2017 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 2018 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
2019 | * |
2020 | * This is intended for use by consumers for devices which can have | |
2021 | * some supplies unconnected in normal use, such as some MMC devices. | |
2022 | * It can allow the regulator core to provide stub supplies for other | |
2023 | * supplies requested using normal regulator_get() calls without | |
2024 | * disrupting the operation of drivers that can handle absent | |
2025 | * supplies. | |
2026 | * | |
2027 | * Use of supply names configured via regulator_set_device_supply() is | |
2028 | * strongly encouraged. It is recommended that the supply name used | |
2029 | * should match the name used for the supply and/or the relevant | |
2030 | * device pins in the datasheet. | |
2031 | */ | |
2032 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
2033 | { | |
a8bd42a9 | 2034 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
2035 | } |
2036 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
2037 | ||
e1794aa4 | 2038 | static void destroy_regulator(struct regulator *regulator) |
414c70cb | 2039 | { |
e1794aa4 | 2040 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb | 2041 | |
5de70519 | 2042 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 2043 | |
ed1ae2dd | 2044 | if (regulator->dev) { |
b59b6544 SK |
2045 | if (regulator->device_link) |
2046 | device_link_remove(regulator->dev, &rdev->dev); | |
ed1ae2dd | 2047 | |
2048 | /* remove any sysfs entries */ | |
414c70cb | 2049 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
ed1ae2dd | 2050 | } |
2051 | ||
66cf9a7e | 2052 | regulator_lock(rdev); |
414c70cb | 2053 | list_del(®ulator->list); |
414c70cb | 2054 | |
5ffbd136 MB |
2055 | rdev->open_count--; |
2056 | rdev->exclusive = 0; | |
66cf9a7e | 2057 | regulator_unlock(rdev); |
5ffbd136 | 2058 | |
0630b614 | 2059 | kfree_const(regulator->supply_name); |
1768514e | 2060 | kfree(regulator); |
e1794aa4 SK |
2061 | } |
2062 | ||
2063 | /* regulator_list_mutex lock held by regulator_put() */ | |
2064 | static void _regulator_put(struct regulator *regulator) | |
2065 | { | |
2066 | struct regulator_dev *rdev; | |
2067 | ||
2068 | if (IS_ERR_OR_NULL(regulator)) | |
2069 | return; | |
2070 | ||
2071 | lockdep_assert_held_once(®ulator_list_mutex); | |
2072 | ||
2073 | /* Docs say you must disable before calling regulator_put() */ | |
2074 | WARN_ON(regulator->enable_count); | |
2075 | ||
2076 | rdev = regulator->rdev; | |
2077 | ||
2078 | destroy_regulator(regulator); | |
1768514e | 2079 | |
414c70cb | 2080 | module_put(rdev->owner); |
4affd79a | 2081 | put_device(&rdev->dev); |
23ff2f0f CK |
2082 | } |
2083 | ||
2084 | /** | |
2085 | * regulator_put - "free" the regulator source | |
2086 | * @regulator: regulator source | |
2087 | * | |
2088 | * Note: drivers must ensure that all regulator_enable calls made on this | |
2089 | * regulator source are balanced by regulator_disable calls prior to calling | |
2090 | * this function. | |
2091 | */ | |
2092 | void regulator_put(struct regulator *regulator) | |
2093 | { | |
2094 | mutex_lock(®ulator_list_mutex); | |
2095 | _regulator_put(regulator); | |
414c70cb LG |
2096 | mutex_unlock(®ulator_list_mutex); |
2097 | } | |
2098 | EXPORT_SYMBOL_GPL(regulator_put); | |
2099 | ||
a06ccd9c CK |
2100 | /** |
2101 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
2102 | * | |
2103 | * @dev: device that will be given as the regulator "consumer" | |
2104 | * @id: Supply name or regulator ID | |
2105 | * @alias_dev: device that should be used to lookup the supply | |
2106 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
2107 | * supply | |
2108 | * | |
2109 | * All lookups for id on dev will instead be conducted for alias_id on | |
2110 | * alias_dev. | |
2111 | */ | |
2112 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
2113 | struct device *alias_dev, | |
2114 | const char *alias_id) | |
2115 | { | |
2116 | struct regulator_supply_alias *map; | |
2117 | ||
2118 | map = regulator_find_supply_alias(dev, id); | |
2119 | if (map) | |
2120 | return -EEXIST; | |
2121 | ||
2122 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
2123 | if (!map) | |
2124 | return -ENOMEM; | |
2125 | ||
2126 | map->src_dev = dev; | |
2127 | map->src_supply = id; | |
2128 | map->alias_dev = alias_dev; | |
2129 | map->alias_supply = alias_id; | |
2130 | ||
2131 | list_add(&map->list, ®ulator_supply_alias_list); | |
2132 | ||
2133 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
2134 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
2135 | ||
2136 | return 0; | |
2137 | } | |
2138 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
2139 | ||
2140 | /** | |
2141 | * regulator_unregister_supply_alias - Remove device alias | |
2142 | * | |
2143 | * @dev: device that will be given as the regulator "consumer" | |
2144 | * @id: Supply name or regulator ID | |
2145 | * | |
2146 | * Remove a lookup alias if one exists for id on dev. | |
2147 | */ | |
2148 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
2149 | { | |
2150 | struct regulator_supply_alias *map; | |
2151 | ||
2152 | map = regulator_find_supply_alias(dev, id); | |
2153 | if (map) { | |
2154 | list_del(&map->list); | |
2155 | kfree(map); | |
2156 | } | |
2157 | } | |
2158 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
2159 | ||
2160 | /** | |
2161 | * regulator_bulk_register_supply_alias - register multiple aliases | |
2162 | * | |
2163 | * @dev: device that will be given as the regulator "consumer" | |
2164 | * @id: List of supply names or regulator IDs | |
2165 | * @alias_dev: device that should be used to lookup the supply | |
2166 | * @alias_id: List of supply names or regulator IDs that should be used to | |
2167 | * lookup the supply | |
2168 | * @num_id: Number of aliases to register | |
2169 | * | |
2170 | * @return 0 on success, an errno on failure. | |
2171 | * | |
2172 | * This helper function allows drivers to register several supply | |
2173 | * aliases in one operation. If any of the aliases cannot be | |
2174 | * registered any aliases that were registered will be removed | |
2175 | * before returning to the caller. | |
2176 | */ | |
9f8c0fe9 LJ |
2177 | int regulator_bulk_register_supply_alias(struct device *dev, |
2178 | const char *const *id, | |
a06ccd9c | 2179 | struct device *alias_dev, |
9f8c0fe9 | 2180 | const char *const *alias_id, |
a06ccd9c CK |
2181 | int num_id) |
2182 | { | |
2183 | int i; | |
2184 | int ret; | |
2185 | ||
2186 | for (i = 0; i < num_id; ++i) { | |
2187 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
2188 | alias_id[i]); | |
2189 | if (ret < 0) | |
2190 | goto err; | |
2191 | } | |
2192 | ||
2193 | return 0; | |
2194 | ||
2195 | err: | |
2196 | dev_err(dev, | |
2197 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
2198 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
2199 | ||
2200 | while (--i >= 0) | |
2201 | regulator_unregister_supply_alias(dev, id[i]); | |
2202 | ||
2203 | return ret; | |
2204 | } | |
2205 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
2206 | ||
2207 | /** | |
2208 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
2209 | * | |
2210 | * @dev: device that will be given as the regulator "consumer" | |
2211 | * @id: List of supply names or regulator IDs | |
2212 | * @num_id: Number of aliases to unregister | |
2213 | * | |
2214 | * This helper function allows drivers to unregister several supply | |
2215 | * aliases in one operation. | |
2216 | */ | |
2217 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 2218 | const char *const *id, |
a06ccd9c CK |
2219 | int num_id) |
2220 | { | |
2221 | int i; | |
2222 | ||
2223 | for (i = 0; i < num_id; ++i) | |
2224 | regulator_unregister_supply_alias(dev, id[i]); | |
2225 | } | |
2226 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
2227 | ||
2228 | ||
f19b00da KM |
2229 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
2230 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
2231 | const struct regulator_config *config) | |
2232 | { | |
2233 | struct regulator_enable_gpio *pin; | |
778b28b4 | 2234 | struct gpio_desc *gpiod; |
f19b00da | 2235 | |
541d052d | 2236 | gpiod = config->ena_gpiod; |
778b28b4 | 2237 | |
f19b00da | 2238 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 2239 | if (pin->gpiod == gpiod) { |
541d052d | 2240 | rdev_dbg(rdev, "GPIO is already used\n"); |
f19b00da KM |
2241 | goto update_ena_gpio_to_rdev; |
2242 | } | |
2243 | } | |
2244 | ||
f19b00da | 2245 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); |
541d052d | 2246 | if (pin == NULL) |
f19b00da | 2247 | return -ENOMEM; |
f19b00da | 2248 | |
778b28b4 | 2249 | pin->gpiod = gpiod; |
f19b00da KM |
2250 | list_add(&pin->list, ®ulator_ena_gpio_list); |
2251 | ||
2252 | update_ena_gpio_to_rdev: | |
2253 | pin->request_count++; | |
2254 | rdev->ena_pin = pin; | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
2259 | { | |
2260 | struct regulator_enable_gpio *pin, *n; | |
2261 | ||
2262 | if (!rdev->ena_pin) | |
2263 | return; | |
2264 | ||
2265 | /* Free the GPIO only in case of no use */ | |
2266 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 2267 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
2268 | if (pin->request_count <= 1) { |
2269 | pin->request_count = 0; | |
78927aa4 | 2270 | gpiod_put(pin->gpiod); |
f19b00da KM |
2271 | list_del(&pin->list); |
2272 | kfree(pin); | |
60a2362f SWK |
2273 | rdev->ena_pin = NULL; |
2274 | return; | |
f19b00da KM |
2275 | } else { |
2276 | pin->request_count--; | |
2277 | } | |
2278 | } | |
2279 | } | |
2280 | } | |
2281 | ||
967cfb18 | 2282 | /** |
31d6eebf RD |
2283 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
2284 | * @rdev: regulator_dev structure | |
2285 | * @enable: enable GPIO at initial use? | |
2286 | * | |
967cfb18 KM |
2287 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2288 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2289 | */ | |
2290 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2291 | { | |
2292 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2293 | ||
2294 | if (!pin) | |
2295 | return -EINVAL; | |
2296 | ||
2297 | if (enable) { | |
2298 | /* Enable GPIO at initial use */ | |
2299 | if (pin->enable_count == 0) | |
01dc79cd | 2300 | gpiod_set_value_cansleep(pin->gpiod, 1); |
967cfb18 KM |
2301 | |
2302 | pin->enable_count++; | |
2303 | } else { | |
2304 | if (pin->enable_count > 1) { | |
2305 | pin->enable_count--; | |
2306 | return 0; | |
2307 | } | |
2308 | ||
2309 | /* Disable GPIO if not used */ | |
2310 | if (pin->enable_count <= 1) { | |
01dc79cd | 2311 | gpiod_set_value_cansleep(pin->gpiod, 0); |
967cfb18 KM |
2312 | pin->enable_count = 0; |
2313 | } | |
2314 | } | |
2315 | ||
2316 | return 0; | |
2317 | } | |
2318 | ||
79fd1141 GX |
2319 | /** |
2320 | * _regulator_enable_delay - a delay helper function | |
2321 | * @delay: time to delay in microseconds | |
2322 | * | |
2323 | * Delay for the requested amount of time as per the guidelines in: | |
2324 | * | |
458f69ef | 2325 | * Documentation/timers/timers-howto.rst |
79fd1141 GX |
2326 | * |
2327 | * The assumption here is that regulators will never be enabled in | |
2328 | * atomic context and therefore sleeping functions can be used. | |
2329 | */ | |
2330 | static void _regulator_enable_delay(unsigned int delay) | |
2331 | { | |
2332 | unsigned int ms = delay / 1000; | |
2333 | unsigned int us = delay % 1000; | |
2334 | ||
2335 | if (ms > 0) { | |
2336 | /* | |
2337 | * For small enough values, handle super-millisecond | |
2338 | * delays in the usleep_range() call below. | |
2339 | */ | |
2340 | if (ms < 20) | |
2341 | us += ms * 1000; | |
2342 | else | |
2343 | msleep(ms); | |
2344 | } | |
2345 | ||
2346 | /* | |
2347 | * Give the scheduler some room to coalesce with any other | |
2348 | * wakeup sources. For delays shorter than 10 us, don't even | |
2349 | * bother setting up high-resolution timers and just busy- | |
2350 | * loop. | |
2351 | */ | |
2352 | if (us >= 10) | |
2353 | usleep_range(us, us + 100); | |
2354 | else | |
2355 | udelay(us); | |
2356 | } | |
2357 | ||
f7d7ad42 SS |
2358 | /** |
2359 | * _regulator_check_status_enabled | |
2360 | * | |
2361 | * A helper function to check if the regulator status can be interpreted | |
2362 | * as 'regulator is enabled'. | |
2363 | * @rdev: the regulator device to check | |
2364 | * | |
2365 | * Return: | |
2366 | * * 1 - if status shows regulator is in enabled state | |
2367 | * * 0 - if not enabled state | |
2368 | * * Error Value - as received from ops->get_status() | |
2369 | */ | |
2370 | static inline int _regulator_check_status_enabled(struct regulator_dev *rdev) | |
2371 | { | |
2372 | int ret = rdev->desc->ops->get_status(rdev); | |
2373 | ||
2374 | if (ret < 0) { | |
2375 | rdev_info(rdev, "get_status returned error: %d\n", ret); | |
2376 | return ret; | |
2377 | } | |
2378 | ||
2379 | switch (ret) { | |
2380 | case REGULATOR_STATUS_OFF: | |
2381 | case REGULATOR_STATUS_ERROR: | |
2382 | case REGULATOR_STATUS_UNDEFINED: | |
2383 | return 0; | |
2384 | default: | |
2385 | return 1; | |
2386 | } | |
2387 | } | |
2388 | ||
5c5659d0 MB |
2389 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2390 | { | |
2391 | int ret, delay; | |
2392 | ||
2393 | /* Query before enabling in case configuration dependent. */ | |
2394 | ret = _regulator_get_enable_time(rdev); | |
2395 | if (ret >= 0) { | |
2396 | delay = ret; | |
2397 | } else { | |
2398 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2399 | delay = 0; | |
2400 | } | |
2401 | ||
2402 | trace_regulator_enable(rdev_get_name(rdev)); | |
2403 | ||
871f5650 GX |
2404 | if (rdev->desc->off_on_delay) { |
2405 | /* if needed, keep a distance of off_on_delay from last time | |
2406 | * this regulator was disabled. | |
2407 | */ | |
2408 | unsigned long start_jiffy = jiffies; | |
2409 | unsigned long intended, max_delay, remaining; | |
2410 | ||
2411 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2412 | intended = rdev->last_off_jiffy + max_delay; | |
2413 | ||
2414 | if (time_before(start_jiffy, intended)) { | |
2415 | /* calc remaining jiffies to deal with one-time | |
2416 | * timer wrapping. | |
2417 | * in case of multiple timer wrapping, either it can be | |
2418 | * detected by out-of-range remaining, or it cannot be | |
48f1b4ef | 2419 | * detected and we get a penalty of |
871f5650 GX |
2420 | * _regulator_enable_delay(). |
2421 | */ | |
2422 | remaining = intended - start_jiffy; | |
2423 | if (remaining <= max_delay) | |
2424 | _regulator_enable_delay( | |
2425 | jiffies_to_usecs(remaining)); | |
2426 | } | |
2427 | } | |
2428 | ||
967cfb18 | 2429 | if (rdev->ena_pin) { |
29d62ec5 DA |
2430 | if (!rdev->ena_gpio_state) { |
2431 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2432 | if (ret < 0) | |
2433 | return ret; | |
2434 | rdev->ena_gpio_state = 1; | |
2435 | } | |
65f73508 | 2436 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2437 | ret = rdev->desc->ops->enable(rdev); |
2438 | if (ret < 0) | |
2439 | return ret; | |
2440 | } else { | |
2441 | return -EINVAL; | |
2442 | } | |
2443 | ||
2444 | /* Allow the regulator to ramp; it would be useful to extend | |
2445 | * this for bulk operations so that the regulators can ramp | |
2446 | * together. */ | |
2447 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2448 | ||
f7d7ad42 SS |
2449 | /* If poll_enabled_time is set, poll upto the delay calculated |
2450 | * above, delaying poll_enabled_time uS to check if the regulator | |
2451 | * actually got enabled. | |
2452 | * If the regulator isn't enabled after enable_delay has | |
2453 | * expired, return -ETIMEDOUT. | |
2454 | */ | |
2455 | if (rdev->desc->poll_enabled_time) { | |
2456 | unsigned int time_remaining = delay; | |
2457 | ||
2458 | while (time_remaining > 0) { | |
2459 | _regulator_enable_delay(rdev->desc->poll_enabled_time); | |
2460 | ||
2461 | if (rdev->desc->ops->get_status) { | |
2462 | ret = _regulator_check_status_enabled(rdev); | |
2463 | if (ret < 0) | |
2464 | return ret; | |
2465 | else if (ret) | |
2466 | break; | |
2467 | } else if (rdev->desc->ops->is_enabled(rdev)) | |
2468 | break; | |
2469 | ||
2470 | time_remaining -= rdev->desc->poll_enabled_time; | |
2471 | } | |
2472 | ||
2473 | if (time_remaining <= 0) { | |
2474 | rdev_err(rdev, "Enabled check timed out\n"); | |
2475 | return -ETIMEDOUT; | |
2476 | } | |
2477 | } else { | |
2478 | _regulator_enable_delay(delay); | |
2479 | } | |
5c5659d0 MB |
2480 | |
2481 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2482 | ||
2483 | return 0; | |
2484 | } | |
2485 | ||
5451781d DA |
2486 | /** |
2487 | * _regulator_handle_consumer_enable - handle that a consumer enabled | |
2488 | * @regulator: regulator source | |
2489 | * | |
2490 | * Some things on a regulator consumer (like the contribution towards total | |
2491 | * load on the regulator) only have an effect when the consumer wants the | |
2492 | * regulator enabled. Explained in example with two consumers of the same | |
2493 | * regulator: | |
2494 | * consumer A: set_load(100); => total load = 0 | |
2495 | * consumer A: regulator_enable(); => total load = 100 | |
2496 | * consumer B: set_load(1000); => total load = 100 | |
2497 | * consumer B: regulator_enable(); => total load = 1100 | |
2498 | * consumer A: regulator_disable(); => total_load = 1000 | |
2499 | * | |
2500 | * This function (together with _regulator_handle_consumer_disable) is | |
2501 | * responsible for keeping track of the refcount for a given regulator consumer | |
2502 | * and applying / unapplying these things. | |
2503 | * | |
2504 | * Returns 0 upon no error; -error upon error. | |
2505 | */ | |
2506 | static int _regulator_handle_consumer_enable(struct regulator *regulator) | |
2507 | { | |
2508 | struct regulator_dev *rdev = regulator->rdev; | |
2509 | ||
2510 | lockdep_assert_held_once(&rdev->mutex.base); | |
2511 | ||
2512 | regulator->enable_count++; | |
2513 | if (regulator->uA_load && regulator->enable_count == 1) | |
2514 | return drms_uA_update(rdev); | |
2515 | ||
2516 | return 0; | |
2517 | } | |
2518 | ||
2519 | /** | |
2520 | * _regulator_handle_consumer_disable - handle that a consumer disabled | |
2521 | * @regulator: regulator source | |
2522 | * | |
2523 | * The opposite of _regulator_handle_consumer_enable(). | |
2524 | * | |
2525 | * Returns 0 upon no error; -error upon error. | |
2526 | */ | |
2527 | static int _regulator_handle_consumer_disable(struct regulator *regulator) | |
2528 | { | |
2529 | struct regulator_dev *rdev = regulator->rdev; | |
2530 | ||
2531 | lockdep_assert_held_once(&rdev->mutex.base); | |
2532 | ||
2533 | if (!regulator->enable_count) { | |
2534 | rdev_err(rdev, "Underflow of regulator enable count\n"); | |
2535 | return -EINVAL; | |
2536 | } | |
2537 | ||
2538 | regulator->enable_count--; | |
2539 | if (regulator->uA_load && regulator->enable_count == 0) | |
2540 | return drms_uA_update(rdev); | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | ||
414c70cb | 2545 | /* locks held by regulator_enable() */ |
5451781d | 2546 | static int _regulator_enable(struct regulator *regulator) |
414c70cb | 2547 | { |
5451781d | 2548 | struct regulator_dev *rdev = regulator->rdev; |
5c5659d0 | 2549 | int ret; |
414c70cb | 2550 | |
f8702f9e DO |
2551 | lockdep_assert_held_once(&rdev->mutex.base); |
2552 | ||
1fc12b05 | 2553 | if (rdev->use_count == 0 && rdev->supply) { |
5451781d | 2554 | ret = _regulator_enable(rdev->supply); |
f8702f9e DO |
2555 | if (ret < 0) |
2556 | return ret; | |
2557 | } | |
2558 | ||
2559 | /* balance only if there are regulators coupled */ | |
2560 | if (rdev->coupling_desc.n_coupled > 1) { | |
2561 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2562 | if (ret < 0) | |
2563 | goto err_disable_supply; | |
2564 | } | |
70cfef26 | 2565 | |
5451781d DA |
2566 | ret = _regulator_handle_consumer_enable(regulator); |
2567 | if (ret < 0) | |
2568 | goto err_disable_supply; | |
414c70cb | 2569 | |
9a2372fa MB |
2570 | if (rdev->use_count == 0) { |
2571 | /* The regulator may on if it's not switchable or left on */ | |
2572 | ret = _regulator_is_enabled(rdev); | |
2573 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 | 2574 | if (!regulator_ops_is_valid(rdev, |
f8702f9e DO |
2575 | REGULATOR_CHANGE_STATUS)) { |
2576 | ret = -EPERM; | |
5451781d | 2577 | goto err_consumer_disable; |
f8702f9e | 2578 | } |
9a2372fa | 2579 | |
5c5659d0 | 2580 | ret = _regulator_do_enable(rdev); |
31aae2be | 2581 | if (ret < 0) |
5451781d | 2582 | goto err_consumer_disable; |
31aae2be | 2583 | |
264b88c9 HG |
2584 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2585 | NULL); | |
a7433cff | 2586 | } else if (ret < 0) { |
5da84fd9 | 2587 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
5451781d | 2588 | goto err_consumer_disable; |
414c70cb | 2589 | } |
a7433cff | 2590 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2591 | } |
2592 | ||
9a2372fa MB |
2593 | rdev->use_count++; |
2594 | ||
2595 | return 0; | |
f8702f9e | 2596 | |
5451781d DA |
2597 | err_consumer_disable: |
2598 | _regulator_handle_consumer_disable(regulator); | |
2599 | ||
f8702f9e | 2600 | err_disable_supply: |
1fc12b05 | 2601 | if (rdev->use_count == 0 && rdev->supply) |
5451781d | 2602 | _regulator_disable(rdev->supply); |
f8702f9e DO |
2603 | |
2604 | return ret; | |
414c70cb LG |
2605 | } |
2606 | ||
2607 | /** | |
2608 | * regulator_enable - enable regulator output | |
2609 | * @regulator: regulator source | |
2610 | * | |
cf7bbcdf MB |
2611 | * Request that the regulator be enabled with the regulator output at |
2612 | * the predefined voltage or current value. Calls to regulator_enable() | |
2613 | * must be balanced with calls to regulator_disable(). | |
2614 | * | |
414c70cb | 2615 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2616 | * hardwired in the regulator. |
414c70cb LG |
2617 | */ |
2618 | int regulator_enable(struct regulator *regulator) | |
2619 | { | |
412aec61 | 2620 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2621 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2622 | int ret; |
6492bc1b | 2623 | |
f8702f9e | 2624 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2625 | ret = _regulator_enable(regulator); |
f8702f9e | 2626 | regulator_unlock_dependent(rdev, &ww_ctx); |
3801b86a | 2627 | |
414c70cb LG |
2628 | return ret; |
2629 | } | |
2630 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2631 | ||
5c5659d0 MB |
2632 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2633 | { | |
2634 | int ret; | |
2635 | ||
2636 | trace_regulator_disable(rdev_get_name(rdev)); | |
2637 | ||
967cfb18 | 2638 | if (rdev->ena_pin) { |
29d62ec5 DA |
2639 | if (rdev->ena_gpio_state) { |
2640 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2641 | if (ret < 0) | |
2642 | return ret; | |
2643 | rdev->ena_gpio_state = 0; | |
2644 | } | |
5c5659d0 MB |
2645 | |
2646 | } else if (rdev->desc->ops->disable) { | |
2647 | ret = rdev->desc->ops->disable(rdev); | |
2648 | if (ret != 0) | |
2649 | return ret; | |
2650 | } | |
2651 | ||
871f5650 GX |
2652 | /* cares about last_off_jiffy only if off_on_delay is required by |
2653 | * device. | |
2654 | */ | |
2655 | if (rdev->desc->off_on_delay) | |
2656 | rdev->last_off_jiffy = jiffies; | |
2657 | ||
5c5659d0 MB |
2658 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2659 | ||
5c5659d0 MB |
2660 | return 0; |
2661 | } | |
2662 | ||
414c70cb | 2663 | /* locks held by regulator_disable() */ |
5451781d | 2664 | static int _regulator_disable(struct regulator *regulator) |
414c70cb | 2665 | { |
5451781d | 2666 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2667 | int ret = 0; |
2668 | ||
f8702f9e | 2669 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2670 | |
cd94b505 | 2671 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2672 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2673 | return -EIO; |
2674 | ||
414c70cb | 2675 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2676 | if (rdev->use_count == 1 && |
2677 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2678 | |
2679 | /* we are last user */ | |
8a34e979 | 2680 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2681 | ret = _notifier_call_chain(rdev, |
2682 | REGULATOR_EVENT_PRE_DISABLE, | |
2683 | NULL); | |
2684 | if (ret & NOTIFY_STOP_MASK) | |
2685 | return -EINVAL; | |
2686 | ||
5c5659d0 | 2687 | ret = _regulator_do_disable(rdev); |
414c70cb | 2688 | if (ret < 0) { |
5da84fd9 | 2689 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2690 | _notifier_call_chain(rdev, |
2691 | REGULATOR_EVENT_ABORT_DISABLE, | |
2692 | NULL); | |
414c70cb LG |
2693 | return ret; |
2694 | } | |
66fda75f MP |
2695 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2696 | NULL); | |
414c70cb LG |
2697 | } |
2698 | ||
414c70cb LG |
2699 | rdev->use_count = 0; |
2700 | } else if (rdev->use_count > 1) { | |
414c70cb LG |
2701 | rdev->use_count--; |
2702 | } | |
3801b86a | 2703 | |
5451781d DA |
2704 | if (ret == 0) |
2705 | ret = _regulator_handle_consumer_disable(regulator); | |
2706 | ||
f8702f9e DO |
2707 | if (ret == 0 && rdev->coupling_desc.n_coupled > 1) |
2708 | ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2709 | ||
1fc12b05 | 2710 | if (ret == 0 && rdev->use_count == 0 && rdev->supply) |
5451781d | 2711 | ret = _regulator_disable(rdev->supply); |
f8702f9e | 2712 | |
414c70cb LG |
2713 | return ret; |
2714 | } | |
2715 | ||
2716 | /** | |
2717 | * regulator_disable - disable regulator output | |
2718 | * @regulator: regulator source | |
2719 | * | |
cf7bbcdf MB |
2720 | * Disable the regulator output voltage or current. Calls to |
2721 | * regulator_enable() must be balanced with calls to | |
2722 | * regulator_disable(). | |
69279fb9 | 2723 | * |
414c70cb | 2724 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2725 | * devices have it enabled, the regulator device supports disabling and |
2726 | * machine constraints permit this operation. | |
414c70cb LG |
2727 | */ |
2728 | int regulator_disable(struct regulator *regulator) | |
2729 | { | |
412aec61 | 2730 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2731 | struct ww_acquire_ctx ww_ctx; |
5451781d | 2732 | int ret; |
6492bc1b | 2733 | |
f8702f9e | 2734 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2735 | ret = _regulator_disable(regulator); |
f8702f9e | 2736 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2737 | |
414c70cb LG |
2738 | return ret; |
2739 | } | |
2740 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2741 | ||
2742 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2743 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2744 | { |
2745 | int ret = 0; | |
2746 | ||
f8702f9e | 2747 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 2748 | |
a1c8a551 RF |
2749 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2750 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2751 | if (ret & NOTIFY_STOP_MASK) | |
2752 | return -EINVAL; | |
2753 | ||
66fda75f MP |
2754 | ret = _regulator_do_disable(rdev); |
2755 | if (ret < 0) { | |
2756 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2757 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2758 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2759 | return ret; |
414c70cb LG |
2760 | } |
2761 | ||
66fda75f MP |
2762 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2763 | REGULATOR_EVENT_DISABLE, NULL); | |
2764 | ||
2765 | return 0; | |
414c70cb LG |
2766 | } |
2767 | ||
2768 | /** | |
2769 | * regulator_force_disable - force disable regulator output | |
2770 | * @regulator: regulator source | |
2771 | * | |
2772 | * Forcibly disable the regulator output voltage or current. | |
2773 | * NOTE: this *will* disable the regulator output even if other consumer | |
2774 | * devices have it enabled. This should be used for situations when device | |
2775 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2776 | */ | |
2777 | int regulator_force_disable(struct regulator *regulator) | |
2778 | { | |
82d15839 | 2779 | struct regulator_dev *rdev = regulator->rdev; |
f8702f9e | 2780 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
2781 | int ret; |
2782 | ||
f8702f9e | 2783 | regulator_lock_dependent(rdev, &ww_ctx); |
5451781d | 2784 | |
3801b86a | 2785 | ret = _regulator_force_disable(regulator->rdev); |
5451781d | 2786 | |
9243a195 MP |
2787 | if (rdev->coupling_desc.n_coupled > 1) |
2788 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
5451781d DA |
2789 | |
2790 | if (regulator->uA_load) { | |
2791 | regulator->uA_load = 0; | |
2792 | ret = drms_uA_update(rdev); | |
2793 | } | |
2794 | ||
1fc12b05 DA |
2795 | if (rdev->use_count != 0 && rdev->supply) |
2796 | _regulator_disable(rdev->supply); | |
8cbf811d | 2797 | |
1fc12b05 | 2798 | regulator_unlock_dependent(rdev, &ww_ctx); |
8cbf811d | 2799 | |
414c70cb LG |
2800 | return ret; |
2801 | } | |
2802 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2803 | ||
da07ecd9 MB |
2804 | static void regulator_disable_work(struct work_struct *work) |
2805 | { | |
2806 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2807 | disable_work.work); | |
f8702f9e | 2808 | struct ww_acquire_ctx ww_ctx; |
da07ecd9 | 2809 | int count, i, ret; |
5451781d DA |
2810 | struct regulator *regulator; |
2811 | int total_count = 0; | |
da07ecd9 | 2812 | |
f8702f9e | 2813 | regulator_lock_dependent(rdev, &ww_ctx); |
da07ecd9 | 2814 | |
c9ccaa0c TR |
2815 | /* |
2816 | * Workqueue functions queue the new work instance while the previous | |
2817 | * work instance is being processed. Cancel the queued work instance | |
2818 | * as the work instance under processing does the job of the queued | |
2819 | * work instance. | |
2820 | */ | |
2821 | cancel_delayed_work(&rdev->disable_work); | |
2822 | ||
5451781d DA |
2823 | list_for_each_entry(regulator, &rdev->consumer_list, list) { |
2824 | count = regulator->deferred_disables; | |
2825 | ||
2826 | if (!count) | |
2827 | continue; | |
2828 | ||
2829 | total_count += count; | |
2830 | regulator->deferred_disables = 0; | |
2831 | ||
2832 | for (i = 0; i < count; i++) { | |
2833 | ret = _regulator_disable(regulator); | |
2834 | if (ret != 0) | |
2835 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2836 | } | |
da07ecd9 | 2837 | } |
5451781d | 2838 | WARN_ON(!total_count); |
da07ecd9 | 2839 | |
f8702f9e DO |
2840 | if (rdev->coupling_desc.n_coupled > 1) |
2841 | regulator_balance_voltage(rdev, PM_SUSPEND_ON); | |
2842 | ||
2843 | regulator_unlock_dependent(rdev, &ww_ctx); | |
da07ecd9 MB |
2844 | } |
2845 | ||
2846 | /** | |
2847 | * regulator_disable_deferred - disable regulator output with delay | |
2848 | * @regulator: regulator source | |
48f1b4ef | 2849 | * @ms: milliseconds until the regulator is disabled |
da07ecd9 MB |
2850 | * |
2851 | * Execute regulator_disable() on the regulator after a delay. This | |
2852 | * is intended for use with devices that require some time to quiesce. | |
2853 | * | |
2854 | * NOTE: this will only disable the regulator output if no other consumer | |
2855 | * devices have it enabled, the regulator device supports disabling and | |
2856 | * machine constraints permit this operation. | |
2857 | */ | |
2858 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2859 | { | |
2860 | struct regulator_dev *rdev = regulator->rdev; | |
2861 | ||
2b5a24a0 MB |
2862 | if (!ms) |
2863 | return regulator_disable(regulator); | |
2864 | ||
66cf9a7e | 2865 | regulator_lock(rdev); |
5451781d | 2866 | regulator->deferred_disables++; |
c9ccaa0c TR |
2867 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2868 | msecs_to_jiffies(ms)); | |
66cf9a7e | 2869 | regulator_unlock(rdev); |
da07ecd9 | 2870 | |
70dc6daf | 2871 | return 0; |
da07ecd9 MB |
2872 | } |
2873 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2874 | ||
414c70cb LG |
2875 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2876 | { | |
65f73508 | 2877 | /* A GPIO control always takes precedence */ |
7b74d149 | 2878 | if (rdev->ena_pin) |
65f73508 MB |
2879 | return rdev->ena_gpio_state; |
2880 | ||
9a7f6a4c | 2881 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2882 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2883 | return 1; |
414c70cb | 2884 | |
9332546f | 2885 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2886 | } |
2887 | ||
3d67fe95 MP |
2888 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2889 | unsigned selector, int lock) | |
3a40cfc3 | 2890 | { |
3a40cfc3 SH |
2891 | const struct regulator_ops *ops = rdev->desc->ops; |
2892 | int ret; | |
2893 | ||
2894 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2895 | return rdev->desc->fixed_uV; | |
2896 | ||
2897 | if (ops->list_voltage) { | |
2898 | if (selector >= rdev->desc->n_voltages) | |
2899 | return -EINVAL; | |
2900 | if (lock) | |
66cf9a7e | 2901 | regulator_lock(rdev); |
3a40cfc3 SH |
2902 | ret = ops->list_voltage(rdev, selector); |
2903 | if (lock) | |
66cf9a7e | 2904 | regulator_unlock(rdev); |
fd086045 | 2905 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2906 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2907 | selector, lock); | |
3a40cfc3 SH |
2908 | } else { |
2909 | return -EINVAL; | |
2910 | } | |
2911 | ||
2912 | if (ret > 0) { | |
2913 | if (ret < rdev->constraints->min_uV) | |
2914 | ret = 0; | |
2915 | else if (ret > rdev->constraints->max_uV) | |
2916 | ret = 0; | |
2917 | } | |
2918 | ||
2919 | return ret; | |
2920 | } | |
2921 | ||
414c70cb LG |
2922 | /** |
2923 | * regulator_is_enabled - is the regulator output enabled | |
2924 | * @regulator: regulator source | |
2925 | * | |
412aec61 DB |
2926 | * Returns positive if the regulator driver backing the source/client |
2927 | * has requested that the device be enabled, zero if it hasn't, else a | |
2928 | * negative errno code. | |
2929 | * | |
2930 | * Note that the device backing this regulator handle can have multiple | |
2931 | * users, so it might be enabled even if regulator_enable() was never | |
2932 | * called for this particular source. | |
414c70cb LG |
2933 | */ |
2934 | int regulator_is_enabled(struct regulator *regulator) | |
2935 | { | |
9332546f MB |
2936 | int ret; |
2937 | ||
6492bc1b MB |
2938 | if (regulator->always_on) |
2939 | return 1; | |
2940 | ||
f8702f9e | 2941 | regulator_lock(regulator->rdev); |
9332546f | 2942 | ret = _regulator_is_enabled(regulator->rdev); |
f8702f9e | 2943 | regulator_unlock(regulator->rdev); |
9332546f MB |
2944 | |
2945 | return ret; | |
414c70cb LG |
2946 | } |
2947 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2948 | ||
4367cfdc DB |
2949 | /** |
2950 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2951 | * @regulator: regulator source | |
2952 | * | |
2953 | * Returns number of selectors, or negative errno. Selectors are | |
2954 | * numbered starting at zero, and typically correspond to bitfields | |
2955 | * in hardware registers. | |
2956 | */ | |
2957 | int regulator_count_voltages(struct regulator *regulator) | |
2958 | { | |
2959 | struct regulator_dev *rdev = regulator->rdev; | |
2960 | ||
26988efe JMC |
2961 | if (rdev->desc->n_voltages) |
2962 | return rdev->desc->n_voltages; | |
2963 | ||
fd086045 | 2964 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
2965 | return -EINVAL; |
2966 | ||
2967 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2968 | } |
2969 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2970 | ||
2971 | /** | |
2972 | * regulator_list_voltage - enumerate supported voltages | |
2973 | * @regulator: regulator source | |
2974 | * @selector: identify voltage to list | |
2975 | * Context: can sleep | |
2976 | * | |
2977 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2978 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2979 | * negative errno. |
2980 | */ | |
2981 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2982 | { | |
3d67fe95 | 2983 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
2984 | } |
2985 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2986 | ||
04eca28c TT |
2987 | /** |
2988 | * regulator_get_regmap - get the regulator's register map | |
2989 | * @regulator: regulator source | |
2990 | * | |
2991 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2992 | * if the regulator doesn't use regmap. | |
2993 | */ | |
2994 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2995 | { | |
2996 | struct regmap *map = regulator->rdev->regmap; | |
2997 | ||
2998 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2999 | } | |
3000 | ||
3001 | /** | |
3002 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
3003 | * @regulator: regulator source | |
3004 | * @vsel_reg: voltage selector register, output parameter | |
3005 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
3006 | * | |
3007 | * Returns the hardware register offset and bitmask used for setting the | |
3008 | * regulator voltage. This might be useful when configuring voltage-scaling | |
3009 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
3010 | * for example. | |
3011 | * | |
3012 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
3013 | * and 0 is returned, otherwise a negative errno is returned. | |
3014 | */ | |
3015 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
3016 | unsigned *vsel_reg, | |
3017 | unsigned *vsel_mask) | |
3018 | { | |
39f5460d GX |
3019 | struct regulator_dev *rdev = regulator->rdev; |
3020 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3021 | |
3022 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3023 | return -EOPNOTSUPP; | |
3024 | ||
0d5c8633 CIK |
3025 | *vsel_reg = rdev->desc->vsel_reg; |
3026 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c TT |
3027 | |
3028 | return 0; | |
3029 | } | |
3030 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
3031 | ||
3032 | /** | |
3033 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
3034 | * @regulator: regulator source | |
3035 | * @selector: identify voltage to list | |
3036 | * | |
3037 | * Converts the selector to a hardware-specific voltage selector that can be | |
3038 | * directly written to the regulator registers. The address of the voltage | |
3039 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
3040 | * | |
3041 | * On error a negative errno is returned. | |
3042 | */ | |
3043 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
3044 | unsigned selector) | |
3045 | { | |
39f5460d GX |
3046 | struct regulator_dev *rdev = regulator->rdev; |
3047 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
3048 | |
3049 | if (selector >= rdev->desc->n_voltages) | |
3050 | return -EINVAL; | |
3051 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
3052 | return -EOPNOTSUPP; | |
3053 | ||
3054 | return selector; | |
3055 | } | |
3056 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
3057 | ||
2a668a8b PW |
3058 | /** |
3059 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
3060 | * @regulator: regulator source | |
3061 | * | |
3062 | * Returns the voltage step size between VSEL values for linear | |
3063 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
3064 | */ | |
3065 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
3066 | { | |
3067 | struct regulator_dev *rdev = regulator->rdev; | |
3068 | ||
3069 | return rdev->desc->uV_step; | |
3070 | } | |
3071 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
3072 | ||
a7a1ad90 MB |
3073 | /** |
3074 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
3075 | * | |
3076 | * @regulator: Regulator to check. | |
3077 | * @min_uV: Minimum required voltage in uV. | |
3078 | * @max_uV: Maximum required voltage in uV. | |
3079 | * | |
49820944 | 3080 | * Returns a boolean. |
a7a1ad90 MB |
3081 | */ |
3082 | int regulator_is_supported_voltage(struct regulator *regulator, | |
3083 | int min_uV, int max_uV) | |
3084 | { | |
c5f3939b | 3085 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
3086 | int i, voltages, ret; |
3087 | ||
c5f3939b | 3088 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 3089 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
3090 | ret = regulator_get_voltage(regulator); |
3091 | if (ret >= 0) | |
0d25d09d | 3092 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
3093 | else |
3094 | return ret; | |
3095 | } | |
3096 | ||
bd7a2b60 PM |
3097 | /* Any voltage within constrains range is fine? */ |
3098 | if (rdev->desc->continuous_voltage_range) | |
3099 | return min_uV >= rdev->constraints->min_uV && | |
3100 | max_uV <= rdev->constraints->max_uV; | |
3101 | ||
a7a1ad90 MB |
3102 | ret = regulator_count_voltages(regulator); |
3103 | if (ret < 0) | |
49820944 | 3104 | return 0; |
a7a1ad90 MB |
3105 | voltages = ret; |
3106 | ||
3107 | for (i = 0; i < voltages; i++) { | |
3108 | ret = regulator_list_voltage(regulator, i); | |
3109 | ||
3110 | if (ret >= min_uV && ret <= max_uV) | |
3111 | return 1; | |
3112 | } | |
3113 | ||
3114 | return 0; | |
3115 | } | |
a398eaa2 | 3116 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 3117 | |
a204f41e SH |
3118 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
3119 | int max_uV) | |
3120 | { | |
3121 | const struct regulator_desc *desc = rdev->desc; | |
3122 | ||
3123 | if (desc->ops->map_voltage) | |
3124 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
3125 | ||
3126 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
3127 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
3128 | ||
3129 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
3130 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
3131 | ||
18e4b55f MV |
3132 | if (desc->ops->list_voltage == |
3133 | regulator_list_voltage_pickable_linear_range) | |
3134 | return regulator_map_voltage_pickable_linear_range(rdev, | |
3135 | min_uV, max_uV); | |
3136 | ||
a204f41e SH |
3137 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); |
3138 | } | |
3139 | ||
7179569a HS |
3140 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
3141 | int min_uV, int max_uV, | |
3142 | unsigned *selector) | |
3143 | { | |
3144 | struct pre_voltage_change_data data; | |
3145 | int ret; | |
3146 | ||
d22b85a1 | 3147 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3148 | data.min_uV = min_uV; |
3149 | data.max_uV = max_uV; | |
3150 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3151 | &data); | |
3152 | if (ret & NOTIFY_STOP_MASK) | |
3153 | return -EINVAL; | |
3154 | ||
3155 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
3156 | if (ret >= 0) | |
3157 | return ret; | |
3158 | ||
3159 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3160 | (void *)data.old_uV); | |
3161 | ||
3162 | return ret; | |
3163 | } | |
3164 | ||
3165 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
3166 | int uV, unsigned selector) | |
3167 | { | |
3168 | struct pre_voltage_change_data data; | |
3169 | int ret; | |
3170 | ||
d22b85a1 | 3171 | data.old_uV = regulator_get_voltage_rdev(rdev); |
7179569a HS |
3172 | data.min_uV = uV; |
3173 | data.max_uV = uV; | |
3174 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
3175 | &data); | |
3176 | if (ret & NOTIFY_STOP_MASK) | |
3177 | return -EINVAL; | |
3178 | ||
3179 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
3180 | if (ret >= 0) | |
3181 | return ret; | |
3182 | ||
3183 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
3184 | (void *)data.old_uV); | |
3185 | ||
3186 | return ret; | |
3187 | } | |
3188 | ||
2da8d947 BG |
3189 | static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev, |
3190 | int uV, int new_selector) | |
3191 | { | |
3192 | const struct regulator_ops *ops = rdev->desc->ops; | |
3193 | int diff, old_sel, curr_sel, ret; | |
3194 | ||
3195 | /* Stepping is only needed if the regulator is enabled. */ | |
3196 | if (!_regulator_is_enabled(rdev)) | |
3197 | goto final_set; | |
3198 | ||
3199 | if (!ops->get_voltage_sel) | |
3200 | return -EINVAL; | |
3201 | ||
3202 | old_sel = ops->get_voltage_sel(rdev); | |
3203 | if (old_sel < 0) | |
3204 | return old_sel; | |
3205 | ||
3206 | diff = new_selector - old_sel; | |
3207 | if (diff == 0) | |
3208 | return 0; /* No change needed. */ | |
3209 | ||
3210 | if (diff > 0) { | |
3211 | /* Stepping up. */ | |
3212 | for (curr_sel = old_sel + rdev->desc->vsel_step; | |
3213 | curr_sel < new_selector; | |
3214 | curr_sel += rdev->desc->vsel_step) { | |
3215 | /* | |
3216 | * Call the callback directly instead of using | |
3217 | * _regulator_call_set_voltage_sel() as we don't | |
3218 | * want to notify anyone yet. Same in the branch | |
3219 | * below. | |
3220 | */ | |
3221 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3222 | if (ret) | |
3223 | goto try_revert; | |
3224 | } | |
3225 | } else { | |
3226 | /* Stepping down. */ | |
3227 | for (curr_sel = old_sel - rdev->desc->vsel_step; | |
3228 | curr_sel > new_selector; | |
3229 | curr_sel -= rdev->desc->vsel_step) { | |
3230 | ret = ops->set_voltage_sel(rdev, curr_sel); | |
3231 | if (ret) | |
3232 | goto try_revert; | |
3233 | } | |
3234 | } | |
3235 | ||
3236 | final_set: | |
3237 | /* The final selector will trigger the notifiers. */ | |
3238 | return _regulator_call_set_voltage_sel(rdev, uV, new_selector); | |
3239 | ||
3240 | try_revert: | |
3241 | /* | |
3242 | * At least try to return to the previous voltage if setting a new | |
3243 | * one failed. | |
3244 | */ | |
3245 | (void)ops->set_voltage_sel(rdev, old_sel); | |
3246 | return ret; | |
3247 | } | |
3248 | ||
73e705bf MK |
3249 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
3250 | int old_uV, int new_uV) | |
3251 | { | |
3252 | unsigned int ramp_delay = 0; | |
3253 | ||
3254 | if (rdev->constraints->ramp_delay) | |
3255 | ramp_delay = rdev->constraints->ramp_delay; | |
3256 | else if (rdev->desc->ramp_delay) | |
3257 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
3258 | else if (rdev->constraints->settling_time) |
3259 | return rdev->constraints->settling_time; | |
3ffad468 MK |
3260 | else if (rdev->constraints->settling_time_up && |
3261 | (new_uV > old_uV)) | |
3262 | return rdev->constraints->settling_time_up; | |
3263 | else if (rdev->constraints->settling_time_down && | |
3264 | (new_uV < old_uV)) | |
3265 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
3266 | |
3267 | if (ramp_delay == 0) { | |
ba14fa1a | 3268 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
3269 | return 0; |
3270 | } | |
3271 | ||
3272 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
3273 | } | |
3274 | ||
75790251 MB |
3275 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
3276 | int min_uV, int max_uV) | |
3277 | { | |
3278 | int ret; | |
77af1b26 | 3279 | int delay = 0; |
e113d792 | 3280 | int best_val = 0; |
75790251 | 3281 | unsigned int selector; |
eba41a5e | 3282 | int old_selector = -1; |
57995a48 | 3283 | const struct regulator_ops *ops = rdev->desc->ops; |
d22b85a1 | 3284 | int old_uV = regulator_get_voltage_rdev(rdev); |
75790251 MB |
3285 | |
3286 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
3287 | ||
bf5892a8 MB |
3288 | min_uV += rdev->constraints->uV_offset; |
3289 | max_uV += rdev->constraints->uV_offset; | |
3290 | ||
eba41a5e AL |
3291 | /* |
3292 | * If we can't obtain the old selector there is not enough | |
3293 | * info to call set_voltage_time_sel(). | |
3294 | */ | |
8b7485ef | 3295 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
3296 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
3297 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
3298 | if (old_selector < 0) |
3299 | return old_selector; | |
3300 | } | |
3301 | ||
57995a48 | 3302 | if (ops->set_voltage) { |
7179569a HS |
3303 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
3304 | &selector); | |
e113d792 MB |
3305 | |
3306 | if (ret >= 0) { | |
57995a48 MK |
3307 | if (ops->list_voltage) |
3308 | best_val = ops->list_voltage(rdev, | |
3309 | selector); | |
e113d792 | 3310 | else |
d22b85a1 | 3311 | best_val = regulator_get_voltage_rdev(rdev); |
e113d792 MB |
3312 | } |
3313 | ||
57995a48 | 3314 | } else if (ops->set_voltage_sel) { |
a204f41e | 3315 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 3316 | if (ret >= 0) { |
57995a48 | 3317 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
3318 | if (min_uV <= best_val && max_uV >= best_val) { |
3319 | selector = ret; | |
c66a566a AL |
3320 | if (old_selector == selector) |
3321 | ret = 0; | |
2da8d947 BG |
3322 | else if (rdev->desc->vsel_step) |
3323 | ret = _regulator_set_voltage_sel_step( | |
3324 | rdev, best_val, selector); | |
c66a566a | 3325 | else |
7179569a HS |
3326 | ret = _regulator_call_set_voltage_sel( |
3327 | rdev, best_val, selector); | |
e113d792 MB |
3328 | } else { |
3329 | ret = -EINVAL; | |
3330 | } | |
e8eef82b | 3331 | } |
75790251 MB |
3332 | } else { |
3333 | ret = -EINVAL; | |
3334 | } | |
e8eef82b | 3335 | |
31dfe686 MK |
3336 | if (ret) |
3337 | goto out; | |
77af1b26 | 3338 | |
73e705bf MK |
3339 | if (ops->set_voltage_time_sel) { |
3340 | /* | |
3341 | * Call set_voltage_time_sel if successfully obtained | |
3342 | * old_selector | |
3343 | */ | |
3344 | if (old_selector >= 0 && old_selector != selector) | |
3345 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
3346 | selector); | |
3347 | } else { | |
3348 | if (old_uV != best_val) { | |
3349 | if (ops->set_voltage_time) | |
3350 | delay = ops->set_voltage_time(rdev, old_uV, | |
3351 | best_val); | |
3352 | else | |
3353 | delay = _regulator_set_voltage_time(rdev, | |
3354 | old_uV, | |
3355 | best_val); | |
e8eef82b | 3356 | } |
73e705bf | 3357 | } |
75790251 | 3358 | |
73e705bf MK |
3359 | if (delay < 0) { |
3360 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
3361 | delay = 0; | |
77af1b26 LW |
3362 | } |
3363 | ||
73e705bf MK |
3364 | /* Insert any necessary delays */ |
3365 | if (delay >= 1000) { | |
3366 | mdelay(delay / 1000); | |
3367 | udelay(delay % 1000); | |
3368 | } else if (delay) { | |
3369 | udelay(delay); | |
77af1b26 LW |
3370 | } |
3371 | ||
31dfe686 | 3372 | if (best_val >= 0) { |
2f6c797f AL |
3373 | unsigned long data = best_val; |
3374 | ||
ded06a52 | 3375 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
3376 | (void *)data); |
3377 | } | |
ded06a52 | 3378 | |
31dfe686 | 3379 | out: |
eba41a5e | 3380 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
3381 | |
3382 | return ret; | |
3383 | } | |
3384 | ||
f7efad10 CZ |
3385 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
3386 | int min_uV, int max_uV, suspend_state_t state) | |
3387 | { | |
3388 | struct regulator_state *rstate; | |
3389 | int uV, sel; | |
3390 | ||
3391 | rstate = regulator_get_suspend_state(rdev, state); | |
3392 | if (rstate == NULL) | |
3393 | return -EINVAL; | |
3394 | ||
3395 | if (min_uV < rstate->min_uV) | |
3396 | min_uV = rstate->min_uV; | |
3397 | if (max_uV > rstate->max_uV) | |
3398 | max_uV = rstate->max_uV; | |
3399 | ||
3400 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
3401 | if (sel < 0) | |
3402 | return sel; | |
3403 | ||
3404 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
3405 | if (uV >= min_uV && uV <= max_uV) | |
3406 | rstate->uV = uV; | |
3407 | ||
3408 | return 0; | |
3409 | } | |
3410 | ||
a9f226bc | 3411 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
3412 | int min_uV, int max_uV, |
3413 | suspend_state_t state) | |
414c70cb LG |
3414 | { |
3415 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3416 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 3417 | int ret = 0; |
92d7a558 | 3418 | int old_min_uV, old_max_uV; |
c00dc359 | 3419 | int current_uV; |
414c70cb | 3420 | |
95a3c23a MB |
3421 | /* If we're setting the same range as last time the change |
3422 | * should be a noop (some cpufreq implementations use the same | |
3423 | * voltage for multiple frequencies, for example). | |
3424 | */ | |
c360a6df | 3425 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
3426 | goto out; |
3427 | ||
c00dc359 | 3428 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 3429 | * return successfully even though the regulator does not support |
c00dc359 BA |
3430 | * changing the voltage. |
3431 | */ | |
8a34e979 | 3432 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
d22b85a1 | 3433 | current_uV = regulator_get_voltage_rdev(rdev); |
c00dc359 | 3434 | if (min_uV <= current_uV && current_uV <= max_uV) { |
c360a6df CZ |
3435 | voltage->min_uV = min_uV; |
3436 | voltage->max_uV = max_uV; | |
c00dc359 BA |
3437 | goto out; |
3438 | } | |
3439 | } | |
3440 | ||
414c70cb | 3441 | /* sanity check */ |
e8eef82b MB |
3442 | if (!rdev->desc->ops->set_voltage && |
3443 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
3444 | ret = -EINVAL; |
3445 | goto out; | |
3446 | } | |
3447 | ||
3448 | /* constraints check */ | |
3449 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3450 | if (ret < 0) | |
3451 | goto out; | |
0d25d09d | 3452 | |
92d7a558 | 3453 | /* restore original values in case of error */ |
c360a6df CZ |
3454 | old_min_uV = voltage->min_uV; |
3455 | old_max_uV = voltage->max_uV; | |
3456 | voltage->min_uV = min_uV; | |
3457 | voltage->max_uV = max_uV; | |
3a93f2a9 | 3458 | |
9243a195 MP |
3459 | /* for not coupled regulators this will just set the voltage */ |
3460 | ret = regulator_balance_voltage(rdev, state); | |
70b46491 ST |
3461 | if (ret < 0) { |
3462 | voltage->min_uV = old_min_uV; | |
3463 | voltage->max_uV = old_max_uV; | |
3464 | } | |
05fda3b1 | 3465 | |
9243a195 | 3466 | out: |
9243a195 MP |
3467 | return ret; |
3468 | } | |
3469 | ||
d22b85a1 DO |
3470 | int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, |
3471 | int max_uV, suspend_state_t state) | |
9243a195 MP |
3472 | { |
3473 | int best_supply_uV = 0; | |
3474 | int supply_change_uV = 0; | |
3475 | int ret; | |
3476 | ||
43fc99f2 MB |
3477 | if (rdev->supply && |
3478 | regulator_ops_is_valid(rdev->supply->rdev, | |
3479 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
3480 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
3481 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
3482 | int current_supply_uV; |
3483 | int selector; | |
3484 | ||
3485 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
3486 | if (selector < 0) { | |
3487 | ret = selector; | |
9243a195 | 3488 | goto out; |
fc42112c SH |
3489 | } |
3490 | ||
00cb9f4f | 3491 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
3492 | if (best_supply_uV < 0) { |
3493 | ret = best_supply_uV; | |
9243a195 | 3494 | goto out; |
fc42112c SH |
3495 | } |
3496 | ||
3497 | best_supply_uV += rdev->desc->min_dropout_uV; | |
3498 | ||
d22b85a1 | 3499 | current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); |
fc42112c SH |
3500 | if (current_supply_uV < 0) { |
3501 | ret = current_supply_uV; | |
9243a195 | 3502 | goto out; |
fc42112c SH |
3503 | } |
3504 | ||
3505 | supply_change_uV = best_supply_uV - current_supply_uV; | |
3506 | } | |
3507 | ||
3508 | if (supply_change_uV > 0) { | |
3509 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3510 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3511 | if (ret) { |
3512 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3513 | ret); | |
9243a195 | 3514 | goto out; |
fc42112c SH |
3515 | } |
3516 | } | |
3517 | ||
f7efad10 CZ |
3518 | if (state == PM_SUSPEND_ON) |
3519 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3520 | else | |
3521 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3522 | max_uV, state); | |
92d7a558 | 3523 | if (ret < 0) |
9243a195 | 3524 | goto out; |
0d25d09d | 3525 | |
fc42112c SH |
3526 | if (supply_change_uV < 0) { |
3527 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3528 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3529 | if (ret) |
3530 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3531 | ret); | |
3532 | /* No need to fail here */ | |
3533 | ret = 0; | |
3534 | } | |
3535 | ||
414c70cb | 3536 | out: |
a9f226bc | 3537 | return ret; |
69686176 | 3538 | } |
3d7610e8 | 3539 | EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev); |
69686176 | 3540 | |
85254bcf DO |
3541 | static int regulator_limit_voltage_step(struct regulator_dev *rdev, |
3542 | int *current_uV, int *min_uV) | |
3543 | { | |
3544 | struct regulation_constraints *constraints = rdev->constraints; | |
3545 | ||
3546 | /* Limit voltage change only if necessary */ | |
3547 | if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) | |
3548 | return 1; | |
3549 | ||
3550 | if (*current_uV < 0) { | |
d22b85a1 | 3551 | *current_uV = regulator_get_voltage_rdev(rdev); |
85254bcf DO |
3552 | |
3553 | if (*current_uV < 0) | |
3554 | return *current_uV; | |
3555 | } | |
3556 | ||
3557 | if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) | |
3558 | return 1; | |
3559 | ||
3560 | /* Clamp target voltage within the given step */ | |
3561 | if (*current_uV < *min_uV) | |
3562 | *min_uV = min(*current_uV + constraints->max_uV_step, | |
3563 | *min_uV); | |
3564 | else | |
3565 | *min_uV = max(*current_uV - constraints->max_uV_step, | |
3566 | *min_uV); | |
3567 | ||
3568 | return 0; | |
3569 | } | |
3570 | ||
c054c6c7 MP |
3571 | static int regulator_get_optimal_voltage(struct regulator_dev *rdev, |
3572 | int *current_uV, | |
3573 | int *min_uV, int *max_uV, | |
3574 | suspend_state_t state, | |
3575 | int n_coupled) | |
3576 | { | |
3577 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3578 | struct regulator_dev **c_rdevs = c_desc->coupled_rdevs; | |
3579 | struct regulation_constraints *constraints = rdev->constraints; | |
c054c6c7 MP |
3580 | int desired_min_uV = 0, desired_max_uV = INT_MAX; |
3581 | int max_current_uV = 0, min_current_uV = INT_MAX; | |
3582 | int highest_min_uV = 0, target_uV, possible_uV; | |
d8ca7d18 | 3583 | int i, ret, max_spread; |
c054c6c7 MP |
3584 | bool done; |
3585 | ||
3586 | *current_uV = -1; | |
3587 | ||
3588 | /* | |
3589 | * If there are no coupled regulators, simply set the voltage | |
3590 | * demanded by consumers. | |
3591 | */ | |
3592 | if (n_coupled == 1) { | |
3593 | /* | |
3594 | * If consumers don't provide any demands, set voltage | |
3595 | * to min_uV | |
3596 | */ | |
3597 | desired_min_uV = constraints->min_uV; | |
3598 | desired_max_uV = constraints->max_uV; | |
3599 | ||
3600 | ret = regulator_check_consumers(rdev, | |
3601 | &desired_min_uV, | |
3602 | &desired_max_uV, state); | |
3603 | if (ret < 0) | |
3604 | return ret; | |
3605 | ||
3606 | possible_uV = desired_min_uV; | |
3607 | done = true; | |
3608 | ||
3609 | goto finish; | |
3610 | } | |
3611 | ||
3612 | /* Find highest min desired voltage */ | |
3613 | for (i = 0; i < n_coupled; i++) { | |
3614 | int tmp_min = 0; | |
3615 | int tmp_max = INT_MAX; | |
3616 | ||
f8702f9e | 3617 | lockdep_assert_held_once(&c_rdevs[i]->mutex.base); |
c054c6c7 MP |
3618 | |
3619 | ret = regulator_check_consumers(c_rdevs[i], | |
3620 | &tmp_min, | |
3621 | &tmp_max, state); | |
3622 | if (ret < 0) | |
3623 | return ret; | |
3624 | ||
3625 | ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max); | |
3626 | if (ret < 0) | |
3627 | return ret; | |
69686176 | 3628 | |
c054c6c7 MP |
3629 | highest_min_uV = max(highest_min_uV, tmp_min); |
3630 | ||
3631 | if (i == 0) { | |
3632 | desired_min_uV = tmp_min; | |
3633 | desired_max_uV = tmp_max; | |
3634 | } | |
3635 | } | |
3636 | ||
d8ca7d18 DO |
3637 | max_spread = constraints->max_spread[0]; |
3638 | ||
c054c6c7 MP |
3639 | /* |
3640 | * Let target_uV be equal to the desired one if possible. | |
3641 | * If not, set it to minimum voltage, allowed by other coupled | |
3642 | * regulators. | |
3643 | */ | |
3644 | target_uV = max(desired_min_uV, highest_min_uV - max_spread); | |
3645 | ||
3646 | /* | |
3647 | * Find min and max voltages, which currently aren't violating | |
3648 | * max_spread. | |
3649 | */ | |
3650 | for (i = 1; i < n_coupled; i++) { | |
3651 | int tmp_act; | |
3652 | ||
3653 | if (!_regulator_is_enabled(c_rdevs[i])) | |
3654 | continue; | |
3655 | ||
d22b85a1 | 3656 | tmp_act = regulator_get_voltage_rdev(c_rdevs[i]); |
c054c6c7 MP |
3657 | if (tmp_act < 0) |
3658 | return tmp_act; | |
3659 | ||
3660 | min_current_uV = min(tmp_act, min_current_uV); | |
3661 | max_current_uV = max(tmp_act, max_current_uV); | |
3662 | } | |
3663 | ||
3664 | /* There aren't any other regulators enabled */ | |
3665 | if (max_current_uV == 0) { | |
3666 | possible_uV = target_uV; | |
3667 | } else { | |
3668 | /* | |
3669 | * Correct target voltage, so as it currently isn't | |
3670 | * violating max_spread | |
3671 | */ | |
3672 | possible_uV = max(target_uV, max_current_uV - max_spread); | |
3673 | possible_uV = min(possible_uV, min_current_uV + max_spread); | |
3674 | } | |
3675 | ||
3676 | if (possible_uV > desired_max_uV) | |
3677 | return -EINVAL; | |
3678 | ||
3679 | done = (possible_uV == target_uV); | |
3680 | desired_min_uV = possible_uV; | |
3681 | ||
3682 | finish: | |
85254bcf DO |
3683 | /* Apply max_uV_step constraint if necessary */ |
3684 | if (state == PM_SUSPEND_ON) { | |
3685 | ret = regulator_limit_voltage_step(rdev, current_uV, | |
3686 | &desired_min_uV); | |
3687 | if (ret < 0) | |
3688 | return ret; | |
3689 | ||
3690 | if (ret == 0) | |
3691 | done = false; | |
3692 | } | |
3693 | ||
c054c6c7 MP |
3694 | /* Set current_uV if wasn't done earlier in the code and if necessary */ |
3695 | if (n_coupled > 1 && *current_uV == -1) { | |
3696 | ||
3697 | if (_regulator_is_enabled(rdev)) { | |
d22b85a1 | 3698 | ret = regulator_get_voltage_rdev(rdev); |
c054c6c7 MP |
3699 | if (ret < 0) |
3700 | return ret; | |
3701 | ||
3702 | *current_uV = ret; | |
3703 | } else { | |
3704 | *current_uV = desired_min_uV; | |
3705 | } | |
3706 | } | |
3707 | ||
3708 | *min_uV = desired_min_uV; | |
3709 | *max_uV = desired_max_uV; | |
3710 | ||
3711 | return done; | |
3712 | } | |
3713 | ||
752db83a MS |
3714 | int regulator_do_balance_voltage(struct regulator_dev *rdev, |
3715 | suspend_state_t state, bool skip_coupled) | |
c054c6c7 MP |
3716 | { |
3717 | struct regulator_dev **c_rdevs; | |
3718 | struct regulator_dev *best_rdev; | |
3719 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3720 | int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev; | |
c054c6c7 | 3721 | unsigned int delta, best_delta; |
d8ca7d18 DO |
3722 | unsigned long c_rdev_done = 0; |
3723 | bool best_c_rdev_done; | |
c054c6c7 MP |
3724 | |
3725 | c_rdevs = c_desc->coupled_rdevs; | |
752db83a | 3726 | n_coupled = skip_coupled ? 1 : c_desc->n_coupled; |
c054c6c7 MP |
3727 | |
3728 | /* | |
3729 | * Find the best possible voltage change on each loop. Leave the loop | |
3730 | * if there isn't any possible change. | |
3731 | */ | |
3732 | do { | |
3733 | best_c_rdev_done = false; | |
3734 | best_delta = 0; | |
3735 | best_min_uV = 0; | |
3736 | best_max_uV = 0; | |
3737 | best_c_rdev = 0; | |
3738 | best_rdev = NULL; | |
3739 | ||
3740 | /* | |
3741 | * Find highest difference between optimal voltage | |
3742 | * and current voltage. | |
3743 | */ | |
3744 | for (i = 0; i < n_coupled; i++) { | |
3745 | /* | |
3746 | * optimal_uV is the best voltage that can be set for | |
3747 | * i-th regulator at the moment without violating | |
3748 | * max_spread constraint in order to balance | |
3749 | * the coupled voltages. | |
3750 | */ | |
3751 | int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0; | |
3752 | ||
d8ca7d18 | 3753 | if (test_bit(i, &c_rdev_done)) |
c054c6c7 MP |
3754 | continue; |
3755 | ||
3756 | ret = regulator_get_optimal_voltage(c_rdevs[i], | |
3757 | ¤t_uV, | |
3758 | &optimal_uV, | |
3759 | &optimal_max_uV, | |
3760 | state, n_coupled); | |
3761 | if (ret < 0) | |
3762 | goto out; | |
3763 | ||
3764 | delta = abs(optimal_uV - current_uV); | |
3765 | ||
3766 | if (delta && best_delta <= delta) { | |
3767 | best_c_rdev_done = ret; | |
3768 | best_delta = delta; | |
3769 | best_rdev = c_rdevs[i]; | |
3770 | best_min_uV = optimal_uV; | |
3771 | best_max_uV = optimal_max_uV; | |
3772 | best_c_rdev = i; | |
3773 | } | |
3774 | } | |
3775 | ||
3776 | /* Nothing to change, return successfully */ | |
3777 | if (!best_rdev) { | |
3778 | ret = 0; | |
3779 | goto out; | |
3780 | } | |
9243a195 | 3781 | |
c054c6c7 MP |
3782 | ret = regulator_set_voltage_rdev(best_rdev, best_min_uV, |
3783 | best_max_uV, state); | |
9243a195 | 3784 | |
c054c6c7 MP |
3785 | if (ret < 0) |
3786 | goto out; | |
3787 | ||
d8ca7d18 DO |
3788 | if (best_c_rdev_done) |
3789 | set_bit(best_c_rdev, &c_rdev_done); | |
c054c6c7 MP |
3790 | |
3791 | } while (n_coupled > 1); | |
3792 | ||
3793 | out: | |
69686176 MP |
3794 | return ret; |
3795 | } | |
3796 | ||
752db83a MS |
3797 | static int regulator_balance_voltage(struct regulator_dev *rdev, |
3798 | suspend_state_t state) | |
3799 | { | |
3800 | struct coupling_desc *c_desc = &rdev->coupling_desc; | |
3801 | struct regulator_coupler *coupler = c_desc->coupler; | |
3802 | bool skip_coupled = false; | |
3803 | ||
3804 | /* | |
3805 | * If system is in a state other than PM_SUSPEND_ON, don't check | |
3806 | * other coupled regulators. | |
3807 | */ | |
3808 | if (state != PM_SUSPEND_ON) | |
3809 | skip_coupled = true; | |
3810 | ||
3811 | if (c_desc->n_resolved < c_desc->n_coupled) { | |
3812 | rdev_err(rdev, "Not all coupled regulators registered\n"); | |
3813 | return -EPERM; | |
3814 | } | |
3815 | ||
3816 | /* Invoke custom balancer for customized couplers */ | |
3817 | if (coupler && coupler->balance_voltage) | |
3818 | return coupler->balance_voltage(coupler, rdev, state); | |
3819 | ||
3820 | return regulator_do_balance_voltage(rdev, state, skip_coupled); | |
3821 | } | |
3822 | ||
a9f226bc SH |
3823 | /** |
3824 | * regulator_set_voltage - set regulator output voltage | |
3825 | * @regulator: regulator source | |
3826 | * @min_uV: Minimum required voltage in uV | |
3827 | * @max_uV: Maximum acceptable voltage in uV | |
3828 | * | |
3829 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3830 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3831 | * | |
3832 | * If the regulator is enabled then the voltage will change to the new value | |
3833 | * immediately otherwise if the regulator is disabled the regulator will | |
3834 | * output at the new voltage when enabled. | |
3835 | * | |
3836 | * NOTE: If the regulator is shared between several devices then the lowest | |
3837 | * request voltage that meets the system constraints will be used. | |
3838 | * Regulator system constraints must be set for this regulator before | |
3839 | * calling this function otherwise this call will fail. | |
3840 | */ | |
3841 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3842 | { | |
f8702f9e DO |
3843 | struct ww_acquire_ctx ww_ctx; |
3844 | int ret; | |
a9f226bc | 3845 | |
f8702f9e | 3846 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3847 | |
c360a6df CZ |
3848 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3849 | PM_SUSPEND_ON); | |
a9f226bc | 3850 | |
f8702f9e | 3851 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
a9f226bc | 3852 | |
414c70cb LG |
3853 | return ret; |
3854 | } | |
3855 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3856 | ||
f7efad10 CZ |
3857 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3858 | suspend_state_t state, bool en) | |
3859 | { | |
3860 | struct regulator_state *rstate; | |
3861 | ||
3862 | rstate = regulator_get_suspend_state(rdev, state); | |
3863 | if (rstate == NULL) | |
3864 | return -EINVAL; | |
3865 | ||
3866 | if (!rstate->changeable) | |
3867 | return -EPERM; | |
3868 | ||
3edd79cf | 3869 | rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND; |
f7efad10 CZ |
3870 | |
3871 | return 0; | |
3872 | } | |
3873 | ||
3874 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3875 | suspend_state_t state) | |
3876 | { | |
3877 | return regulator_suspend_toggle(rdev, state, true); | |
3878 | } | |
3879 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3880 | ||
3881 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3882 | suspend_state_t state) | |
3883 | { | |
3884 | struct regulator *regulator; | |
3885 | struct regulator_voltage *voltage; | |
3886 | ||
3887 | /* | |
3888 | * if any consumer wants this regulator device keeping on in | |
3889 | * suspend states, don't set it as disabled. | |
3890 | */ | |
3891 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3892 | voltage = ®ulator->voltage[state]; | |
3893 | if (voltage->min_uV || voltage->max_uV) | |
3894 | return 0; | |
3895 | } | |
3896 | ||
3897 | return regulator_suspend_toggle(rdev, state, false); | |
3898 | } | |
3899 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3900 | ||
3901 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3902 | int min_uV, int max_uV, | |
3903 | suspend_state_t state) | |
3904 | { | |
3905 | struct regulator_dev *rdev = regulator->rdev; | |
3906 | struct regulator_state *rstate; | |
3907 | ||
3908 | rstate = regulator_get_suspend_state(rdev, state); | |
3909 | if (rstate == NULL) | |
3910 | return -EINVAL; | |
3911 | ||
3912 | if (rstate->min_uV == rstate->max_uV) { | |
3913 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3914 | return -EPERM; | |
3915 | } | |
3916 | ||
3917 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3918 | } | |
3919 | ||
3920 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3921 | int max_uV, suspend_state_t state) | |
3922 | { | |
f8702f9e DO |
3923 | struct ww_acquire_ctx ww_ctx; |
3924 | int ret; | |
f7efad10 CZ |
3925 | |
3926 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3927 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3928 | return -EINVAL; | |
3929 | ||
f8702f9e | 3930 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3931 | |
3932 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3933 | max_uV, state); | |
3934 | ||
f8702f9e | 3935 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
f7efad10 CZ |
3936 | |
3937 | return ret; | |
3938 | } | |
3939 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3940 | ||
88cd222b LW |
3941 | /** |
3942 | * regulator_set_voltage_time - get raise/fall time | |
3943 | * @regulator: regulator source | |
3944 | * @old_uV: starting voltage in microvolts | |
3945 | * @new_uV: target voltage in microvolts | |
3946 | * | |
3947 | * Provided with the starting and ending voltage, this function attempts to | |
3948 | * calculate the time in microseconds required to rise or fall to this new | |
3949 | * voltage. | |
3950 | */ | |
3951 | int regulator_set_voltage_time(struct regulator *regulator, | |
3952 | int old_uV, int new_uV) | |
3953 | { | |
272e2315 GX |
3954 | struct regulator_dev *rdev = regulator->rdev; |
3955 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3956 | int old_sel = -1; |
3957 | int new_sel = -1; | |
3958 | int voltage; | |
3959 | int i; | |
3960 | ||
73e705bf MK |
3961 | if (ops->set_voltage_time) |
3962 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
3963 | else if (!ops->set_voltage_time_sel) | |
3964 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
3965 | ||
88cd222b | 3966 | /* Currently requires operations to do this */ |
73e705bf | 3967 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
3968 | return -EINVAL; |
3969 | ||
3970 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3971 | /* We only look for exact voltage matches here */ | |
3972 | voltage = regulator_list_voltage(regulator, i); | |
3973 | if (voltage < 0) | |
3974 | return -EINVAL; | |
3975 | if (voltage == 0) | |
3976 | continue; | |
3977 | if (voltage == old_uV) | |
3978 | old_sel = i; | |
3979 | if (voltage == new_uV) | |
3980 | new_sel = i; | |
3981 | } | |
3982 | ||
3983 | if (old_sel < 0 || new_sel < 0) | |
3984 | return -EINVAL; | |
3985 | ||
3986 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3987 | } | |
3988 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3989 | ||
98a175b6 | 3990 | /** |
296c6566 RD |
3991 | * regulator_set_voltage_time_sel - get raise/fall time |
3992 | * @rdev: regulator source device | |
98a175b6 YSB |
3993 | * @old_selector: selector for starting voltage |
3994 | * @new_selector: selector for target voltage | |
3995 | * | |
3996 | * Provided with the starting and target voltage selectors, this function | |
3997 | * returns time in microseconds required to rise or fall to this new voltage | |
3998 | * | |
f11d08c3 | 3999 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 4000 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
4001 | */ |
4002 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
4003 | unsigned int old_selector, | |
4004 | unsigned int new_selector) | |
4005 | { | |
f11d08c3 | 4006 | int old_volt, new_volt; |
398715ab | 4007 | |
f11d08c3 AL |
4008 | /* sanity check */ |
4009 | if (!rdev->desc->ops->list_voltage) | |
4010 | return -EINVAL; | |
398715ab | 4011 | |
f11d08c3 AL |
4012 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
4013 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
4014 | ||
73e705bf MK |
4015 | if (rdev->desc->ops->set_voltage_time) |
4016 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
4017 | new_volt); | |
4018 | else | |
4019 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 4020 | } |
b19dbf71 | 4021 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 4022 | |
606a2562 MB |
4023 | /** |
4024 | * regulator_sync_voltage - re-apply last regulator output voltage | |
4025 | * @regulator: regulator source | |
4026 | * | |
4027 | * Re-apply the last configured voltage. This is intended to be used | |
4028 | * where some external control source the consumer is cooperating with | |
4029 | * has caused the configured voltage to change. | |
4030 | */ | |
4031 | int regulator_sync_voltage(struct regulator *regulator) | |
4032 | { | |
4033 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 4034 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
4035 | int ret, min_uV, max_uV; |
4036 | ||
66cf9a7e | 4037 | regulator_lock(rdev); |
606a2562 MB |
4038 | |
4039 | if (!rdev->desc->ops->set_voltage && | |
4040 | !rdev->desc->ops->set_voltage_sel) { | |
4041 | ret = -EINVAL; | |
4042 | goto out; | |
4043 | } | |
4044 | ||
4045 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 4046 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
4047 | ret = -EINVAL; |
4048 | goto out; | |
4049 | } | |
4050 | ||
c360a6df CZ |
4051 | min_uV = voltage->min_uV; |
4052 | max_uV = voltage->max_uV; | |
606a2562 MB |
4053 | |
4054 | /* This should be a paranoia check... */ | |
4055 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
4056 | if (ret < 0) | |
4057 | goto out; | |
4058 | ||
c360a6df | 4059 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
4060 | if (ret < 0) |
4061 | goto out; | |
4062 | ||
4063 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
4064 | ||
4065 | out: | |
66cf9a7e | 4066 | regulator_unlock(rdev); |
606a2562 MB |
4067 | return ret; |
4068 | } | |
4069 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
4070 | ||
d22b85a1 | 4071 | int regulator_get_voltage_rdev(struct regulator_dev *rdev) |
414c70cb | 4072 | { |
bf5892a8 | 4073 | int sel, ret; |
fef95019 MB |
4074 | bool bypassed; |
4075 | ||
4076 | if (rdev->desc->ops->get_bypass) { | |
4077 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
4078 | if (ret < 0) | |
4079 | return ret; | |
4080 | if (bypassed) { | |
4081 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
4082 | if (!rdev->supply) { |
4083 | rdev_err(rdev, | |
4084 | "bypassed regulator has no supply!\n"); | |
4085 | return -EPROBE_DEFER; | |
4086 | } | |
fef95019 | 4087 | |
d22b85a1 | 4088 | return regulator_get_voltage_rdev(rdev->supply->rdev); |
fef95019 MB |
4089 | } |
4090 | } | |
476c2d83 MB |
4091 | |
4092 | if (rdev->desc->ops->get_voltage_sel) { | |
4093 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
4094 | if (sel < 0) | |
4095 | return sel; | |
bf5892a8 | 4096 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 4097 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 4098 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
4099 | } else if (rdev->desc->ops->list_voltage) { |
4100 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
4101 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
4102 | ret = rdev->desc->fixed_uV; | |
e303996e | 4103 | } else if (rdev->supply) { |
d22b85a1 | 4104 | ret = regulator_get_voltage_rdev(rdev->supply->rdev); |
cb220d16 | 4105 | } else { |
414c70cb | 4106 | return -EINVAL; |
cb220d16 | 4107 | } |
bf5892a8 | 4108 | |
cb220d16 AL |
4109 | if (ret < 0) |
4110 | return ret; | |
bf5892a8 | 4111 | return ret - rdev->constraints->uV_offset; |
414c70cb | 4112 | } |
3d7610e8 | 4113 | EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev); |
414c70cb LG |
4114 | |
4115 | /** | |
4116 | * regulator_get_voltage - get regulator output voltage | |
4117 | * @regulator: regulator source | |
4118 | * | |
4119 | * This returns the current regulator voltage in uV. | |
4120 | * | |
4121 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
4122 | * function should not be used to determine regulator state. | |
4123 | */ | |
4124 | int regulator_get_voltage(struct regulator *regulator) | |
4125 | { | |
f8702f9e | 4126 | struct ww_acquire_ctx ww_ctx; |
414c70cb LG |
4127 | int ret; |
4128 | ||
f8702f9e | 4129 | regulator_lock_dependent(regulator->rdev, &ww_ctx); |
d22b85a1 | 4130 | ret = regulator_get_voltage_rdev(regulator->rdev); |
f8702f9e | 4131 | regulator_unlock_dependent(regulator->rdev, &ww_ctx); |
414c70cb LG |
4132 | |
4133 | return ret; | |
4134 | } | |
4135 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
4136 | ||
4137 | /** | |
4138 | * regulator_set_current_limit - set regulator output current limit | |
4139 | * @regulator: regulator source | |
ce0d10f8 | 4140 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
4141 | * @max_uA: Maximum supported current in uA |
4142 | * | |
4143 | * Sets current sink to the desired output current. This can be set during | |
4144 | * any regulator state. IOW, regulator can be disabled or enabled. | |
4145 | * | |
4146 | * If the regulator is enabled then the current will change to the new value | |
4147 | * immediately otherwise if the regulator is disabled the regulator will | |
4148 | * output at the new current when enabled. | |
4149 | * | |
4150 | * NOTE: Regulator system constraints must be set for this regulator before | |
4151 | * calling this function otherwise this call will fail. | |
4152 | */ | |
4153 | int regulator_set_current_limit(struct regulator *regulator, | |
4154 | int min_uA, int max_uA) | |
4155 | { | |
4156 | struct regulator_dev *rdev = regulator->rdev; | |
4157 | int ret; | |
4158 | ||
66cf9a7e | 4159 | regulator_lock(rdev); |
414c70cb LG |
4160 | |
4161 | /* sanity check */ | |
4162 | if (!rdev->desc->ops->set_current_limit) { | |
4163 | ret = -EINVAL; | |
4164 | goto out; | |
4165 | } | |
4166 | ||
4167 | /* constraints check */ | |
4168 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
4169 | if (ret < 0) | |
4170 | goto out; | |
4171 | ||
4172 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
4173 | out: | |
66cf9a7e | 4174 | regulator_unlock(rdev); |
414c70cb LG |
4175 | return ret; |
4176 | } | |
4177 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
4178 | ||
7e4d9683 DA |
4179 | static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev) |
4180 | { | |
4181 | /* sanity check */ | |
4182 | if (!rdev->desc->ops->get_current_limit) | |
4183 | return -EINVAL; | |
4184 | ||
4185 | return rdev->desc->ops->get_current_limit(rdev); | |
4186 | } | |
4187 | ||
414c70cb LG |
4188 | static int _regulator_get_current_limit(struct regulator_dev *rdev) |
4189 | { | |
4190 | int ret; | |
4191 | ||
66cf9a7e | 4192 | regulator_lock(rdev); |
7e4d9683 | 4193 | ret = _regulator_get_current_limit_unlocked(rdev); |
66cf9a7e | 4194 | regulator_unlock(rdev); |
7e4d9683 | 4195 | |
414c70cb LG |
4196 | return ret; |
4197 | } | |
4198 | ||
4199 | /** | |
4200 | * regulator_get_current_limit - get regulator output current | |
4201 | * @regulator: regulator source | |
4202 | * | |
4203 | * This returns the current supplied by the specified current sink in uA. | |
4204 | * | |
4205 | * NOTE: If the regulator is disabled it will return the current value. This | |
4206 | * function should not be used to determine regulator state. | |
4207 | */ | |
4208 | int regulator_get_current_limit(struct regulator *regulator) | |
4209 | { | |
4210 | return _regulator_get_current_limit(regulator->rdev); | |
4211 | } | |
4212 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
4213 | ||
4214 | /** | |
4215 | * regulator_set_mode - set regulator operating mode | |
4216 | * @regulator: regulator source | |
4217 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
4218 | * | |
4219 | * Set regulator operating mode to increase regulator efficiency or improve | |
4220 | * regulation performance. | |
4221 | * | |
4222 | * NOTE: Regulator system constraints must be set for this regulator before | |
4223 | * calling this function otherwise this call will fail. | |
4224 | */ | |
4225 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
4226 | { | |
4227 | struct regulator_dev *rdev = regulator->rdev; | |
4228 | int ret; | |
500b4ac9 | 4229 | int regulator_curr_mode; |
414c70cb | 4230 | |
66cf9a7e | 4231 | regulator_lock(rdev); |
414c70cb LG |
4232 | |
4233 | /* sanity check */ | |
4234 | if (!rdev->desc->ops->set_mode) { | |
4235 | ret = -EINVAL; | |
4236 | goto out; | |
4237 | } | |
4238 | ||
500b4ac9 SI |
4239 | /* return if the same mode is requested */ |
4240 | if (rdev->desc->ops->get_mode) { | |
4241 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
4242 | if (regulator_curr_mode == mode) { | |
4243 | ret = 0; | |
4244 | goto out; | |
4245 | } | |
4246 | } | |
4247 | ||
414c70cb | 4248 | /* constraints check */ |
22c51b47 | 4249 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
4250 | if (ret < 0) |
4251 | goto out; | |
4252 | ||
4253 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
4254 | out: | |
66cf9a7e | 4255 | regulator_unlock(rdev); |
414c70cb LG |
4256 | return ret; |
4257 | } | |
4258 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
4259 | ||
7e4d9683 DA |
4260 | static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev) |
4261 | { | |
4262 | /* sanity check */ | |
4263 | if (!rdev->desc->ops->get_mode) | |
4264 | return -EINVAL; | |
4265 | ||
4266 | return rdev->desc->ops->get_mode(rdev); | |
4267 | } | |
4268 | ||
414c70cb LG |
4269 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) |
4270 | { | |
4271 | int ret; | |
4272 | ||
66cf9a7e | 4273 | regulator_lock(rdev); |
7e4d9683 | 4274 | ret = _regulator_get_mode_unlocked(rdev); |
66cf9a7e | 4275 | regulator_unlock(rdev); |
7e4d9683 | 4276 | |
414c70cb LG |
4277 | return ret; |
4278 | } | |
4279 | ||
4280 | /** | |
4281 | * regulator_get_mode - get regulator operating mode | |
4282 | * @regulator: regulator source | |
4283 | * | |
4284 | * Get the current regulator operating mode. | |
4285 | */ | |
4286 | unsigned int regulator_get_mode(struct regulator *regulator) | |
4287 | { | |
4288 | return _regulator_get_mode(regulator->rdev); | |
4289 | } | |
4290 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
4291 | ||
1b5b4221 AH |
4292 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
4293 | unsigned int *flags) | |
4294 | { | |
4295 | int ret; | |
4296 | ||
66cf9a7e | 4297 | regulator_lock(rdev); |
1b5b4221 AH |
4298 | |
4299 | /* sanity check */ | |
4300 | if (!rdev->desc->ops->get_error_flags) { | |
4301 | ret = -EINVAL; | |
4302 | goto out; | |
4303 | } | |
4304 | ||
4305 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
4306 | out: | |
66cf9a7e | 4307 | regulator_unlock(rdev); |
1b5b4221 AH |
4308 | return ret; |
4309 | } | |
4310 | ||
4311 | /** | |
4312 | * regulator_get_error_flags - get regulator error information | |
4313 | * @regulator: regulator source | |
4314 | * @flags: pointer to store error flags | |
4315 | * | |
4316 | * Get the current regulator error information. | |
4317 | */ | |
4318 | int regulator_get_error_flags(struct regulator *regulator, | |
4319 | unsigned int *flags) | |
4320 | { | |
4321 | return _regulator_get_error_flags(regulator->rdev, flags); | |
4322 | } | |
4323 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
4324 | ||
414c70cb | 4325 | /** |
e39ce48f | 4326 | * regulator_set_load - set regulator load |
414c70cb LG |
4327 | * @regulator: regulator source |
4328 | * @uA_load: load current | |
4329 | * | |
4330 | * Notifies the regulator core of a new device load. This is then used by | |
4331 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
4332 | * operating mode for the new regulator loading. | |
4333 | * | |
4334 | * Consumer devices notify their supply regulator of the maximum power | |
4335 | * they will require (can be taken from device datasheet in the power | |
4336 | * consumption tables) when they change operational status and hence power | |
4337 | * state. Examples of operational state changes that can affect power | |
4338 | * consumption are :- | |
4339 | * | |
4340 | * o Device is opened / closed. | |
4341 | * o Device I/O is about to begin or has just finished. | |
4342 | * o Device is idling in between work. | |
4343 | * | |
4344 | * This information is also exported via sysfs to userspace. | |
4345 | * | |
4346 | * DRMS will sum the total requested load on the regulator and change | |
4347 | * to the most efficient operating mode if platform constraints allow. | |
4348 | * | |
5451781d DA |
4349 | * NOTE: when a regulator consumer requests to have a regulator |
4350 | * disabled then any load that consumer requested no longer counts | |
4351 | * toward the total requested load. If the regulator is re-enabled | |
4352 | * then the previously requested load will start counting again. | |
4353 | * | |
4354 | * If a regulator is an always-on regulator then an individual consumer's | |
4355 | * load will still be removed if that consumer is fully disabled. | |
4356 | * | |
e39ce48f | 4357 | * On error a negative errno is returned. |
414c70cb | 4358 | */ |
e39ce48f | 4359 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
4360 | { |
4361 | struct regulator_dev *rdev = regulator->rdev; | |
5451781d DA |
4362 | int old_uA_load; |
4363 | int ret = 0; | |
d92d95b6 | 4364 | |
66cf9a7e | 4365 | regulator_lock(rdev); |
5451781d | 4366 | old_uA_load = regulator->uA_load; |
414c70cb | 4367 | regulator->uA_load = uA_load; |
5451781d DA |
4368 | if (regulator->enable_count && old_uA_load != uA_load) { |
4369 | ret = drms_uA_update(rdev); | |
4370 | if (ret < 0) | |
4371 | regulator->uA_load = old_uA_load; | |
4372 | } | |
66cf9a7e | 4373 | regulator_unlock(rdev); |
8460ef38 | 4374 | |
414c70cb LG |
4375 | return ret; |
4376 | } | |
e39ce48f | 4377 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 4378 | |
f59c8f9f MB |
4379 | /** |
4380 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
4381 | * | |
4382 | * @regulator: Regulator to configure | |
9345dfb8 | 4383 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
4384 | * |
4385 | * Allow the regulator to go into bypass mode if all other consumers | |
4386 | * for the regulator also enable bypass mode and the machine | |
4387 | * constraints allow this. Bypass mode means that the regulator is | |
4388 | * simply passing the input directly to the output with no regulation. | |
4389 | */ | |
4390 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
4391 | { | |
4392 | struct regulator_dev *rdev = regulator->rdev; | |
48325655 | 4393 | const char *name = rdev_get_name(rdev); |
f59c8f9f MB |
4394 | int ret = 0; |
4395 | ||
4396 | if (!rdev->desc->ops->set_bypass) | |
4397 | return 0; | |
4398 | ||
8a34e979 | 4399 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
4400 | return 0; |
4401 | ||
66cf9a7e | 4402 | regulator_lock(rdev); |
f59c8f9f MB |
4403 | |
4404 | if (enable && !regulator->bypass) { | |
4405 | rdev->bypass_count++; | |
4406 | ||
4407 | if (rdev->bypass_count == rdev->open_count) { | |
48325655 CK |
4408 | trace_regulator_bypass_enable(name); |
4409 | ||
f59c8f9f MB |
4410 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4411 | if (ret != 0) | |
4412 | rdev->bypass_count--; | |
48325655 CK |
4413 | else |
4414 | trace_regulator_bypass_enable_complete(name); | |
f59c8f9f MB |
4415 | } |
4416 | ||
4417 | } else if (!enable && regulator->bypass) { | |
4418 | rdev->bypass_count--; | |
4419 | ||
4420 | if (rdev->bypass_count != rdev->open_count) { | |
48325655 CK |
4421 | trace_regulator_bypass_disable(name); |
4422 | ||
f59c8f9f MB |
4423 | ret = rdev->desc->ops->set_bypass(rdev, enable); |
4424 | if (ret != 0) | |
4425 | rdev->bypass_count++; | |
48325655 CK |
4426 | else |
4427 | trace_regulator_bypass_disable_complete(name); | |
f59c8f9f MB |
4428 | } |
4429 | } | |
4430 | ||
4431 | if (ret == 0) | |
4432 | regulator->bypass = enable; | |
4433 | ||
66cf9a7e | 4434 | regulator_unlock(rdev); |
f59c8f9f MB |
4435 | |
4436 | return ret; | |
4437 | } | |
4438 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
4439 | ||
414c70cb LG |
4440 | /** |
4441 | * regulator_register_notifier - register regulator event notifier | |
4442 | * @regulator: regulator source | |
69279fb9 | 4443 | * @nb: notifier block |
414c70cb LG |
4444 | * |
4445 | * Register notifier block to receive regulator events. | |
4446 | */ | |
4447 | int regulator_register_notifier(struct regulator *regulator, | |
4448 | struct notifier_block *nb) | |
4449 | { | |
4450 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
4451 | nb); | |
4452 | } | |
4453 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
4454 | ||
4455 | /** | |
4456 | * regulator_unregister_notifier - unregister regulator event notifier | |
4457 | * @regulator: regulator source | |
69279fb9 | 4458 | * @nb: notifier block |
414c70cb LG |
4459 | * |
4460 | * Unregister regulator event notifier block. | |
4461 | */ | |
4462 | int regulator_unregister_notifier(struct regulator *regulator, | |
4463 | struct notifier_block *nb) | |
4464 | { | |
4465 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
4466 | nb); | |
4467 | } | |
4468 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
4469 | ||
b136fb44 JC |
4470 | /* notify regulator consumers and downstream regulator consumers. |
4471 | * Note mutex must be held by caller. | |
4472 | */ | |
7179569a | 4473 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
4474 | unsigned long event, void *data) |
4475 | { | |
414c70cb | 4476 | /* call rdev chain first */ |
7179569a | 4477 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
4478 | } |
4479 | ||
4480 | /** | |
4481 | * regulator_bulk_get - get multiple regulator consumers | |
4482 | * | |
4483 | * @dev: Device to supply | |
4484 | * @num_consumers: Number of consumers to register | |
4485 | * @consumers: Configuration of consumers; clients are stored here. | |
4486 | * | |
4487 | * @return 0 on success, an errno on failure. | |
4488 | * | |
4489 | * This helper function allows drivers to get several regulator | |
4490 | * consumers in one operation. If any of the regulators cannot be | |
4491 | * acquired then any regulators that were allocated will be freed | |
4492 | * before returning to the caller. | |
4493 | */ | |
4494 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
4495 | struct regulator_bulk_data *consumers) | |
4496 | { | |
4497 | int i; | |
4498 | int ret; | |
4499 | ||
4500 | for (i = 0; i < num_consumers; i++) | |
4501 | consumers[i].consumer = NULL; | |
4502 | ||
4503 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
4504 | consumers[i].consumer = regulator_get(dev, |
4505 | consumers[i].supply); | |
414c70cb | 4506 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb LG |
4507 | ret = PTR_ERR(consumers[i].consumer); |
4508 | consumers[i].consumer = NULL; | |
4509 | goto err; | |
4510 | } | |
4511 | } | |
4512 | ||
4513 | return 0; | |
4514 | ||
4515 | err: | |
b9816363 JRO |
4516 | if (ret != -EPROBE_DEFER) |
4517 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
4518 | consumers[i].supply, ret); | |
4519 | else | |
4520 | dev_dbg(dev, "Failed to get supply '%s', deferring\n", | |
4521 | consumers[i].supply); | |
4522 | ||
b29c7690 | 4523 | while (--i >= 0) |
414c70cb LG |
4524 | regulator_put(consumers[i].consumer); |
4525 | ||
4526 | return ret; | |
4527 | } | |
4528 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
4529 | ||
f21e0e81 MB |
4530 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
4531 | { | |
4532 | struct regulator_bulk_data *bulk = data; | |
4533 | ||
4534 | bulk->ret = regulator_enable(bulk->consumer); | |
4535 | } | |
4536 | ||
414c70cb LG |
4537 | /** |
4538 | * regulator_bulk_enable - enable multiple regulator consumers | |
4539 | * | |
4540 | * @num_consumers: Number of consumers | |
4541 | * @consumers: Consumer data; clients are stored here. | |
4542 | * @return 0 on success, an errno on failure | |
4543 | * | |
4544 | * This convenience API allows consumers to enable multiple regulator | |
4545 | * clients in a single API call. If any consumers cannot be enabled | |
4546 | * then any others that were enabled will be disabled again prior to | |
4547 | * return. | |
4548 | */ | |
4549 | int regulator_bulk_enable(int num_consumers, | |
4550 | struct regulator_bulk_data *consumers) | |
4551 | { | |
2955b47d | 4552 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 4553 | int i; |
f21e0e81 | 4554 | int ret = 0; |
414c70cb | 4555 | |
6492bc1b | 4556 | for (i = 0; i < num_consumers; i++) { |
5451781d DA |
4557 | async_schedule_domain(regulator_bulk_enable_async, |
4558 | &consumers[i], &async_domain); | |
6492bc1b | 4559 | } |
f21e0e81 MB |
4560 | |
4561 | async_synchronize_full_domain(&async_domain); | |
4562 | ||
4563 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 4564 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
4565 | if (consumers[i].ret != 0) { |
4566 | ret = consumers[i].ret; | |
414c70cb | 4567 | goto err; |
f21e0e81 | 4568 | } |
414c70cb LG |
4569 | } |
4570 | ||
4571 | return 0; | |
4572 | ||
4573 | err: | |
fbe31057 AH |
4574 | for (i = 0; i < num_consumers; i++) { |
4575 | if (consumers[i].ret < 0) | |
4576 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
4577 | consumers[i].ret); | |
4578 | else | |
4579 | regulator_disable(consumers[i].consumer); | |
4580 | } | |
414c70cb LG |
4581 | |
4582 | return ret; | |
4583 | } | |
4584 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
4585 | ||
4586 | /** | |
4587 | * regulator_bulk_disable - disable multiple regulator consumers | |
4588 | * | |
4589 | * @num_consumers: Number of consumers | |
4590 | * @consumers: Consumer data; clients are stored here. | |
4591 | * @return 0 on success, an errno on failure | |
4592 | * | |
4593 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
4594 | * clients in a single API call. If any consumers cannot be disabled |
4595 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
4596 | * return. |
4597 | */ | |
4598 | int regulator_bulk_disable(int num_consumers, | |
4599 | struct regulator_bulk_data *consumers) | |
4600 | { | |
4601 | int i; | |
01e86f49 | 4602 | int ret, r; |
414c70cb | 4603 | |
49e22632 | 4604 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
4605 | ret = regulator_disable(consumers[i].consumer); |
4606 | if (ret != 0) | |
4607 | goto err; | |
4608 | } | |
4609 | ||
4610 | return 0; | |
4611 | ||
4612 | err: | |
5da84fd9 | 4613 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
4614 | for (++i; i < num_consumers; ++i) { |
4615 | r = regulator_enable(consumers[i].consumer); | |
4616 | if (r != 0) | |
d1642ea7 | 4617 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
4618 | consumers[i].supply, r); |
4619 | } | |
414c70cb LG |
4620 | |
4621 | return ret; | |
4622 | } | |
4623 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
4624 | ||
e1de2f42 DK |
4625 | /** |
4626 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
4627 | * | |
4628 | * @num_consumers: Number of consumers | |
4629 | * @consumers: Consumer data; clients are stored here. | |
4630 | * @return 0 on success, an errno on failure | |
4631 | * | |
4632 | * This convenience API allows consumers to forcibly disable multiple regulator | |
4633 | * clients in a single API call. | |
4634 | * NOTE: This should be used for situations when device damage will | |
4635 | * likely occur if the regulators are not disabled (e.g. over temp). | |
4636 | * Although regulator_force_disable function call for some consumers can | |
4637 | * return error numbers, the function is called for all consumers. | |
4638 | */ | |
4639 | int regulator_bulk_force_disable(int num_consumers, | |
4640 | struct regulator_bulk_data *consumers) | |
4641 | { | |
4642 | int i; | |
b8c77ff6 | 4643 | int ret = 0; |
e1de2f42 | 4644 | |
b8c77ff6 | 4645 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
4646 | consumers[i].ret = |
4647 | regulator_force_disable(consumers[i].consumer); | |
4648 | ||
b8c77ff6 DT |
4649 | /* Store first error for reporting */ |
4650 | if (consumers[i].ret && !ret) | |
e1de2f42 | 4651 | ret = consumers[i].ret; |
e1de2f42 DK |
4652 | } |
4653 | ||
e1de2f42 DK |
4654 | return ret; |
4655 | } | |
4656 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
4657 | ||
414c70cb LG |
4658 | /** |
4659 | * regulator_bulk_free - free multiple regulator consumers | |
4660 | * | |
4661 | * @num_consumers: Number of consumers | |
4662 | * @consumers: Consumer data; clients are stored here. | |
4663 | * | |
4664 | * This convenience API allows consumers to free multiple regulator | |
4665 | * clients in a single API call. | |
4666 | */ | |
4667 | void regulator_bulk_free(int num_consumers, | |
4668 | struct regulator_bulk_data *consumers) | |
4669 | { | |
4670 | int i; | |
4671 | ||
4672 | for (i = 0; i < num_consumers; i++) { | |
4673 | regulator_put(consumers[i].consumer); | |
4674 | consumers[i].consumer = NULL; | |
4675 | } | |
4676 | } | |
4677 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
4678 | ||
4679 | /** | |
4680 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 4681 | * @rdev: regulator source |
414c70cb | 4682 | * @event: notifier block |
69279fb9 | 4683 | * @data: callback-specific data. |
414c70cb LG |
4684 | * |
4685 | * Called by regulator drivers to notify clients a regulator event has | |
4686 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 4687 | * Note lock must be held by caller. |
414c70cb LG |
4688 | */ |
4689 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
4690 | unsigned long event, void *data) | |
4691 | { | |
f8702f9e | 4692 | lockdep_assert_held_once(&rdev->mutex.base); |
70cfef26 | 4693 | |
414c70cb LG |
4694 | _notifier_call_chain(rdev, event, data); |
4695 | return NOTIFY_DONE; | |
4696 | ||
4697 | } | |
4698 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
4699 | ||
be721979 MB |
4700 | /** |
4701 | * regulator_mode_to_status - convert a regulator mode into a status | |
4702 | * | |
4703 | * @mode: Mode to convert | |
4704 | * | |
4705 | * Convert a regulator mode into a status. | |
4706 | */ | |
4707 | int regulator_mode_to_status(unsigned int mode) | |
4708 | { | |
4709 | switch (mode) { | |
4710 | case REGULATOR_MODE_FAST: | |
4711 | return REGULATOR_STATUS_FAST; | |
4712 | case REGULATOR_MODE_NORMAL: | |
4713 | return REGULATOR_STATUS_NORMAL; | |
4714 | case REGULATOR_MODE_IDLE: | |
4715 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 4716 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
4717 | return REGULATOR_STATUS_STANDBY; |
4718 | default: | |
1beaf762 | 4719 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
4720 | } |
4721 | } | |
4722 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
4723 | ||
39f802d6 TI |
4724 | static struct attribute *regulator_dev_attrs[] = { |
4725 | &dev_attr_name.attr, | |
4726 | &dev_attr_num_users.attr, | |
4727 | &dev_attr_type.attr, | |
4728 | &dev_attr_microvolts.attr, | |
4729 | &dev_attr_microamps.attr, | |
4730 | &dev_attr_opmode.attr, | |
4731 | &dev_attr_state.attr, | |
4732 | &dev_attr_status.attr, | |
4733 | &dev_attr_bypass.attr, | |
4734 | &dev_attr_requested_microamps.attr, | |
4735 | &dev_attr_min_microvolts.attr, | |
4736 | &dev_attr_max_microvolts.attr, | |
4737 | &dev_attr_min_microamps.attr, | |
4738 | &dev_attr_max_microamps.attr, | |
4739 | &dev_attr_suspend_standby_state.attr, | |
4740 | &dev_attr_suspend_mem_state.attr, | |
4741 | &dev_attr_suspend_disk_state.attr, | |
4742 | &dev_attr_suspend_standby_microvolts.attr, | |
4743 | &dev_attr_suspend_mem_microvolts.attr, | |
4744 | &dev_attr_suspend_disk_microvolts.attr, | |
4745 | &dev_attr_suspend_standby_mode.attr, | |
4746 | &dev_attr_suspend_mem_mode.attr, | |
4747 | &dev_attr_suspend_disk_mode.attr, | |
4748 | NULL | |
4749 | }; | |
4750 | ||
7ad68e2f DB |
4751 | /* |
4752 | * To avoid cluttering sysfs (and memory) with useless state, only | |
4753 | * create attributes that can be meaningfully displayed. | |
4754 | */ | |
39f802d6 TI |
4755 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
4756 | struct attribute *attr, int idx) | |
7ad68e2f | 4757 | { |
39f802d6 | 4758 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 4759 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 4760 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
4761 | umode_t mode = attr->mode; |
4762 | ||
4763 | /* these three are always present */ | |
4764 | if (attr == &dev_attr_name.attr || | |
4765 | attr == &dev_attr_num_users.attr || | |
4766 | attr == &dev_attr_type.attr) | |
4767 | return mode; | |
7ad68e2f DB |
4768 | |
4769 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
4770 | if (attr == &dev_attr_microvolts.attr) { |
4771 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
4772 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
4773 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
4774 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
4775 | return mode; | |
4776 | return 0; | |
f59c8f9f | 4777 | } |
7ad68e2f | 4778 | |
39f802d6 TI |
4779 | if (attr == &dev_attr_microamps.attr) |
4780 | return ops->get_current_limit ? mode : 0; | |
4781 | ||
4782 | if (attr == &dev_attr_opmode.attr) | |
4783 | return ops->get_mode ? mode : 0; | |
4784 | ||
4785 | if (attr == &dev_attr_state.attr) | |
4786 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
4787 | ||
4788 | if (attr == &dev_attr_status.attr) | |
4789 | return ops->get_status ? mode : 0; | |
4790 | ||
4791 | if (attr == &dev_attr_bypass.attr) | |
4792 | return ops->get_bypass ? mode : 0; | |
4793 | ||
7ad68e2f | 4794 | /* constraints need specific supporting methods */ |
39f802d6 TI |
4795 | if (attr == &dev_attr_min_microvolts.attr || |
4796 | attr == &dev_attr_max_microvolts.attr) | |
4797 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
4798 | ||
4799 | if (attr == &dev_attr_min_microamps.attr || | |
4800 | attr == &dev_attr_max_microamps.attr) | |
4801 | return ops->set_current_limit ? mode : 0; | |
4802 | ||
4803 | if (attr == &dev_attr_suspend_standby_state.attr || | |
4804 | attr == &dev_attr_suspend_mem_state.attr || | |
4805 | attr == &dev_attr_suspend_disk_state.attr) | |
4806 | return mode; | |
4807 | ||
4808 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
4809 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
4810 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
4811 | return ops->set_suspend_voltage ? mode : 0; | |
4812 | ||
4813 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4814 | attr == &dev_attr_suspend_mem_mode.attr || | |
4815 | attr == &dev_attr_suspend_disk_mode.attr) | |
4816 | return ops->set_suspend_mode ? mode : 0; | |
4817 | ||
4818 | return mode; | |
4819 | } | |
4820 | ||
4821 | static const struct attribute_group regulator_dev_group = { | |
4822 | .attrs = regulator_dev_attrs, | |
4823 | .is_visible = regulator_attr_is_visible, | |
4824 | }; | |
4825 | ||
4826 | static const struct attribute_group *regulator_dev_groups[] = { | |
4827 | ®ulator_dev_group, | |
4828 | NULL | |
4829 | }; | |
7ad68e2f | 4830 | |
39f802d6 TI |
4831 | static void regulator_dev_release(struct device *dev) |
4832 | { | |
4833 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4834 | |
4835 | kfree(rdev->constraints); | |
4836 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4837 | kfree(rdev); |
7ad68e2f DB |
4838 | } |
4839 | ||
1130e5b3 MB |
4840 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4841 | { | |
a9eaa813 GR |
4842 | struct device *parent = rdev->dev.parent; |
4843 | const char *rname = rdev_get_name(rdev); | |
4844 | char name[NAME_MAX]; | |
4845 | ||
4846 | /* Avoid duplicate debugfs directory names */ | |
4847 | if (parent && rname == rdev->desc->name) { | |
4848 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4849 | rname); | |
4850 | rname = name; | |
4851 | } | |
4852 | ||
4853 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4854 | if (!rdev->debugfs) { |
1130e5b3 | 4855 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4856 | return; |
4857 | } | |
4858 | ||
4859 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4860 | &rdev->use_count); | |
4861 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4862 | &rdev->open_count); | |
f59c8f9f MB |
4863 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4864 | &rdev->bypass_count); | |
1130e5b3 MB |
4865 | } |
4866 | ||
5e3ca2b3 JMC |
4867 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4868 | { | |
7ddede6a JH |
4869 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4870 | ||
4871 | if (regulator_resolve_supply(rdev)) | |
4872 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4873 | ||
4874 | return 0; | |
5e3ca2b3 JMC |
4875 | } |
4876 | ||
d8ca7d18 DO |
4877 | int regulator_coupler_register(struct regulator_coupler *coupler) |
4878 | { | |
4879 | mutex_lock(®ulator_list_mutex); | |
4880 | list_add_tail(&coupler->list, ®ulator_coupler_list); | |
4881 | mutex_unlock(®ulator_list_mutex); | |
4882 | ||
4883 | return 0; | |
4884 | } | |
4885 | ||
4886 | static struct regulator_coupler * | |
4887 | regulator_find_coupler(struct regulator_dev *rdev) | |
4888 | { | |
4889 | struct regulator_coupler *coupler; | |
4890 | int err; | |
4891 | ||
4892 | /* | |
4893 | * Note that regulators are appended to the list and the generic | |
4894 | * coupler is registered first, hence it will be attached at last | |
4895 | * if nobody cared. | |
4896 | */ | |
4897 | list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) { | |
4898 | err = coupler->attach_regulator(coupler, rdev); | |
4899 | if (!err) { | |
4900 | if (!coupler->balance_voltage && | |
4901 | rdev->coupling_desc.n_coupled > 2) | |
4902 | goto err_unsupported; | |
4903 | ||
4904 | return coupler; | |
4905 | } | |
4906 | ||
4907 | if (err < 0) | |
4908 | return ERR_PTR(err); | |
4909 | ||
4910 | if (err == 1) | |
4911 | continue; | |
4912 | ||
4913 | break; | |
4914 | } | |
4915 | ||
4916 | return ERR_PTR(-EINVAL); | |
4917 | ||
4918 | err_unsupported: | |
4919 | if (coupler->detach_regulator) | |
4920 | coupler->detach_regulator(coupler, rdev); | |
4921 | ||
4922 | rdev_err(rdev, | |
4923 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
4924 | ||
4925 | return ERR_PTR(-EPERM); | |
4926 | } | |
4927 | ||
f9503385 | 4928 | static void regulator_resolve_coupling(struct regulator_dev *rdev) |
d3d64537 | 4929 | { |
d8ca7d18 | 4930 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
d3d64537 MP |
4931 | struct coupling_desc *c_desc = &rdev->coupling_desc; |
4932 | int n_coupled = c_desc->n_coupled; | |
4933 | struct regulator_dev *c_rdev; | |
4934 | int i; | |
4935 | ||
4936 | for (i = 1; i < n_coupled; i++) { | |
4937 | /* already resolved */ | |
4938 | if (c_desc->coupled_rdevs[i]) | |
4939 | continue; | |
4940 | ||
4941 | c_rdev = of_parse_coupled_regulator(rdev, i - 1); | |
4942 | ||
f9503385 DO |
4943 | if (!c_rdev) |
4944 | continue; | |
d3d64537 | 4945 | |
d8ca7d18 DO |
4946 | if (c_rdev->coupling_desc.coupler != coupler) { |
4947 | rdev_err(rdev, "coupler mismatch with %s\n", | |
4948 | rdev_get_name(c_rdev)); | |
4949 | return; | |
4950 | } | |
4951 | ||
f9503385 | 4952 | regulator_lock(c_rdev); |
d3d64537 | 4953 | |
f9503385 DO |
4954 | c_desc->coupled_rdevs[i] = c_rdev; |
4955 | c_desc->n_resolved++; | |
d3d64537 | 4956 | |
f9503385 | 4957 | regulator_unlock(c_rdev); |
d3d64537 | 4958 | |
f9503385 DO |
4959 | regulator_resolve_coupling(c_rdev); |
4960 | } | |
d3d64537 MP |
4961 | } |
4962 | ||
6303f3e7 | 4963 | static void regulator_remove_coupling(struct regulator_dev *rdev) |
d3d64537 | 4964 | { |
d8ca7d18 | 4965 | struct regulator_coupler *coupler = rdev->coupling_desc.coupler; |
6303f3e7 DO |
4966 | struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc; |
4967 | struct regulator_dev *__c_rdev, *c_rdev; | |
4968 | unsigned int __n_coupled, n_coupled; | |
4969 | int i, k; | |
d8ca7d18 | 4970 | int err; |
d3d64537 | 4971 | |
6303f3e7 | 4972 | n_coupled = c_desc->n_coupled; |
d3d64537 | 4973 | |
6303f3e7 DO |
4974 | for (i = 1; i < n_coupled; i++) { |
4975 | c_rdev = c_desc->coupled_rdevs[i]; | |
d3d64537 | 4976 | |
6303f3e7 DO |
4977 | if (!c_rdev) |
4978 | continue; | |
4979 | ||
4980 | regulator_lock(c_rdev); | |
4981 | ||
4982 | __c_desc = &c_rdev->coupling_desc; | |
4983 | __n_coupled = __c_desc->n_coupled; | |
4984 | ||
4985 | for (k = 1; k < __n_coupled; k++) { | |
4986 | __c_rdev = __c_desc->coupled_rdevs[k]; | |
4987 | ||
4988 | if (__c_rdev == rdev) { | |
4989 | __c_desc->coupled_rdevs[k] = NULL; | |
4990 | __c_desc->n_resolved--; | |
4991 | break; | |
4992 | } | |
4993 | } | |
4994 | ||
4995 | regulator_unlock(c_rdev); | |
4996 | ||
4997 | c_desc->coupled_rdevs[i] = NULL; | |
4998 | c_desc->n_resolved--; | |
4999 | } | |
d8ca7d18 DO |
5000 | |
5001 | if (coupler && coupler->detach_regulator) { | |
5002 | err = coupler->detach_regulator(coupler, rdev); | |
5003 | if (err) | |
5004 | rdev_err(rdev, "failed to detach from coupler: %d\n", | |
5005 | err); | |
5006 | } | |
5007 | ||
5008 | kfree(rdev->coupling_desc.coupled_rdevs); | |
5009 | rdev->coupling_desc.coupled_rdevs = NULL; | |
d3d64537 MP |
5010 | } |
5011 | ||
f9503385 | 5012 | static int regulator_init_coupling(struct regulator_dev *rdev) |
d3d64537 | 5013 | { |
d8ca7d18 DO |
5014 | int err, n_phandles; |
5015 | size_t alloc_size; | |
d3d64537 MP |
5016 | |
5017 | if (!IS_ENABLED(CONFIG_OF)) | |
5018 | n_phandles = 0; | |
5019 | else | |
5020 | n_phandles = of_get_n_coupled(rdev); | |
5021 | ||
d8ca7d18 DO |
5022 | alloc_size = sizeof(*rdev) * (n_phandles + 1); |
5023 | ||
5024 | rdev->coupling_desc.coupled_rdevs = kzalloc(alloc_size, GFP_KERNEL); | |
5025 | if (!rdev->coupling_desc.coupled_rdevs) | |
5026 | return -ENOMEM; | |
d3d64537 MP |
5027 | |
5028 | /* | |
5029 | * Every regulator should always have coupling descriptor filled with | |
5030 | * at least pointer to itself. | |
5031 | */ | |
5032 | rdev->coupling_desc.coupled_rdevs[0] = rdev; | |
5033 | rdev->coupling_desc.n_coupled = n_phandles + 1; | |
5034 | rdev->coupling_desc.n_resolved++; | |
5035 | ||
5036 | /* regulator isn't coupled */ | |
5037 | if (n_phandles == 0) | |
5038 | return 0; | |
5039 | ||
d8ca7d18 | 5040 | if (!of_check_coupling_data(rdev)) |
d3d64537 | 5041 | return -EPERM; |
d3d64537 | 5042 | |
d8ca7d18 DO |
5043 | rdev->coupling_desc.coupler = regulator_find_coupler(rdev); |
5044 | if (IS_ERR(rdev->coupling_desc.coupler)) { | |
5045 | err = PTR_ERR(rdev->coupling_desc.coupler); | |
5046 | rdev_err(rdev, "failed to get coupler: %d\n", err); | |
5047 | return err; | |
d3d64537 MP |
5048 | } |
5049 | ||
d8ca7d18 DO |
5050 | return 0; |
5051 | } | |
5052 | ||
5053 | static int generic_coupler_attach(struct regulator_coupler *coupler, | |
5054 | struct regulator_dev *rdev) | |
5055 | { | |
5056 | if (rdev->coupling_desc.n_coupled > 2) { | |
5057 | rdev_err(rdev, | |
5058 | "Voltage balancing for multiple regulator couples is unimplemented\n"); | |
d3d64537 | 5059 | return -EPERM; |
d8ca7d18 | 5060 | } |
d3d64537 | 5061 | |
e381bfe4 DO |
5062 | if (!rdev->constraints->always_on) { |
5063 | rdev_err(rdev, | |
5064 | "Coupling of a non always-on regulator is unimplemented\n"); | |
5065 | return -ENOTSUPP; | |
5066 | } | |
5067 | ||
d3d64537 MP |
5068 | return 0; |
5069 | } | |
5070 | ||
d8ca7d18 DO |
5071 | static struct regulator_coupler generic_regulator_coupler = { |
5072 | .attach_regulator = generic_coupler_attach, | |
5073 | }; | |
5074 | ||
414c70cb LG |
5075 | /** |
5076 | * regulator_register - register regulator | |
69279fb9 | 5077 | * @regulator_desc: regulator to register |
f47531b1 | 5078 | * @cfg: runtime configuration for regulator |
414c70cb LG |
5079 | * |
5080 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
5081 | * Returns a valid pointer to struct regulator_dev on success |
5082 | * or an ERR_PTR() on error. | |
414c70cb | 5083 | */ |
65f26846 MB |
5084 | struct regulator_dev * |
5085 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 5086 | const struct regulator_config *cfg) |
414c70cb | 5087 | { |
9a8f5e07 | 5088 | const struct regulation_constraints *constraints = NULL; |
c172708d | 5089 | const struct regulator_init_data *init_data; |
1b3de223 | 5090 | struct regulator_config *config = NULL; |
72dca06f | 5091 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 5092 | struct regulator_dev *rdev; |
0edb040d LW |
5093 | bool dangling_cfg_gpiod = false; |
5094 | bool dangling_of_gpiod = false; | |
32c8fad4 | 5095 | struct device *dev; |
a5766f11 | 5096 | int ret, i; |
414c70cb | 5097 | |
0edb040d | 5098 | if (cfg == NULL) |
414c70cb | 5099 | return ERR_PTR(-EINVAL); |
0edb040d LW |
5100 | if (cfg->ena_gpiod) |
5101 | dangling_cfg_gpiod = true; | |
5102 | if (regulator_desc == NULL) { | |
5103 | ret = -EINVAL; | |
5104 | goto rinse; | |
5105 | } | |
414c70cb | 5106 | |
1b3de223 | 5107 | dev = cfg->dev; |
dcf70112 | 5108 | WARN_ON(!dev); |
32c8fad4 | 5109 | |
0edb040d LW |
5110 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { |
5111 | ret = -EINVAL; | |
5112 | goto rinse; | |
5113 | } | |
414c70cb | 5114 | |
cd78dfc6 | 5115 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
0edb040d LW |
5116 | regulator_desc->type != REGULATOR_CURRENT) { |
5117 | ret = -EINVAL; | |
5118 | goto rinse; | |
5119 | } | |
414c70cb | 5120 | |
476c2d83 MB |
5121 | /* Only one of each should be implemented */ |
5122 | WARN_ON(regulator_desc->ops->get_voltage && | |
5123 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
5124 | WARN_ON(regulator_desc->ops->set_voltage && |
5125 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
5126 | |
5127 | /* If we're using selectors we must implement list_voltage. */ | |
5128 | if (regulator_desc->ops->get_voltage_sel && | |
5129 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5130 | ret = -EINVAL; |
5131 | goto rinse; | |
476c2d83 | 5132 | } |
e8eef82b MB |
5133 | if (regulator_desc->ops->set_voltage_sel && |
5134 | !regulator_desc->ops->list_voltage) { | |
0edb040d LW |
5135 | ret = -EINVAL; |
5136 | goto rinse; | |
e8eef82b | 5137 | } |
476c2d83 | 5138 | |
414c70cb | 5139 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
0edb040d LW |
5140 | if (rdev == NULL) { |
5141 | ret = -ENOMEM; | |
5142 | goto rinse; | |
5143 | } | |
414c70cb | 5144 | |
1b3de223 KK |
5145 | /* |
5146 | * Duplicate the config so the driver could override it after | |
5147 | * parsing init data. | |
5148 | */ | |
5149 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
5150 | if (config == NULL) { | |
5151 | kfree(rdev); | |
0edb040d LW |
5152 | ret = -ENOMEM; |
5153 | goto rinse; | |
1b3de223 KK |
5154 | } |
5155 | ||
bfa21a0d | 5156 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 | 5157 | &rdev->dev.of_node); |
f8970d34 MF |
5158 | |
5159 | /* | |
5160 | * Sometimes not all resources are probed already so we need to take | |
5161 | * that into account. This happens most the time if the ena_gpiod comes | |
5162 | * from a gpio extender or something else. | |
5163 | */ | |
5164 | if (PTR_ERR(init_data) == -EPROBE_DEFER) { | |
5165 | kfree(config); | |
5166 | kfree(rdev); | |
5167 | ret = -EPROBE_DEFER; | |
5168 | goto rinse; | |
5169 | } | |
5170 | ||
0edb040d LW |
5171 | /* |
5172 | * We need to keep track of any GPIO descriptor coming from the | |
5173 | * device tree until we have handled it over to the core. If the | |
5174 | * config that was passed in to this function DOES NOT contain | |
5175 | * a descriptor, and the config after this call DOES contain | |
48f1b4ef | 5176 | * a descriptor, we definitely got one from parsing the device |
0edb040d LW |
5177 | * tree. |
5178 | */ | |
5179 | if (!cfg->ena_gpiod && config->ena_gpiod) | |
5180 | dangling_of_gpiod = true; | |
a0c7b164 MB |
5181 | if (!init_data) { |
5182 | init_data = config->init_data; | |
5183 | rdev->dev.of_node = of_node_get(config->of_node); | |
5184 | } | |
5185 | ||
f8702f9e | 5186 | ww_mutex_init(&rdev->mutex, ®ulator_ww_class); |
c172708d | 5187 | rdev->reg_data = config->driver_data; |
414c70cb LG |
5188 | rdev->owner = regulator_desc->owner; |
5189 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
5190 | if (config->regmap) |
5191 | rdev->regmap = config->regmap; | |
52b84dac | 5192 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 5193 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
5194 | else if (dev->parent) |
5195 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 5196 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 5197 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 5198 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 5199 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 5200 | |
a5766f11 | 5201 | /* preform any regulator specific init */ |
9a8f5e07 | 5202 | if (init_data && init_data->regulator_init) { |
a5766f11 | 5203 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
5204 | if (ret < 0) |
5205 | goto clean; | |
a5766f11 LG |
5206 | } |
5207 | ||
541d052d | 5208 | if (config->ena_gpiod) { |
45389c47 | 5209 | mutex_lock(®ulator_list_mutex); |
daad134d | 5210 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 5211 | mutex_unlock(®ulator_list_mutex); |
daad134d | 5212 | if (ret != 0) { |
541d052d LW |
5213 | rdev_err(rdev, "Failed to request enable GPIO: %d\n", |
5214 | ret); | |
32165230 | 5215 | goto clean; |
daad134d | 5216 | } |
0edb040d LW |
5217 | /* The regulator core took over the GPIO descriptor */ |
5218 | dangling_cfg_gpiod = false; | |
5219 | dangling_of_gpiod = false; | |
daad134d KA |
5220 | } |
5221 | ||
a5766f11 | 5222 | /* register with sysfs */ |
9177514c | 5223 | device_initialize(&rdev->dev); |
414c70cb | 5224 | rdev->dev.class = ®ulator_class; |
a5766f11 | 5225 | rdev->dev.parent = dev; |
72dca06f | 5226 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 5227 | (unsigned long) atomic_inc_return(®ulator_no)); |
9177514c | 5228 | dev_set_drvdata(&rdev->dev, rdev); |
a5766f11 | 5229 | |
74f544c1 | 5230 | /* set regulator constraints */ |
9a8f5e07 MB |
5231 | if (init_data) |
5232 | constraints = &init_data->constraints; | |
5233 | ||
9a8f5e07 | 5234 | if (init_data && init_data->supply_regulator) |
6261b06d | 5235 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 5236 | else if (regulator_desc->supply_name) |
6261b06d | 5237 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 5238 | |
45389c47 JH |
5239 | /* |
5240 | * Attempt to resolve the regulator supply, if specified, | |
5241 | * but don't return an error if we fail because we will try | |
5242 | * to resolve it again later as more regulators are added. | |
5243 | */ | |
5244 | if (regulator_resolve_supply(rdev)) | |
5245 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
5246 | ||
5247 | ret = set_machine_constraints(rdev, constraints); | |
5248 | if (ret < 0) | |
5249 | goto wash; | |
5250 | ||
d8ca7d18 | 5251 | mutex_lock(®ulator_list_mutex); |
f9503385 | 5252 | ret = regulator_init_coupling(rdev); |
d8ca7d18 | 5253 | mutex_unlock(®ulator_list_mutex); |
f9503385 | 5254 | if (ret < 0) |
d3d64537 MP |
5255 | goto wash; |
5256 | ||
a5766f11 | 5257 | /* add consumers devices */ |
9a8f5e07 | 5258 | if (init_data) { |
45389c47 | 5259 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
5260 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
5261 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 5262 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 5263 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 5264 | if (ret < 0) { |
45389c47 | 5265 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
5266 | dev_err(dev, "Failed to set supply %s\n", |
5267 | init_data->consumer_supplies[i].supply); | |
5268 | goto unset_supplies; | |
5269 | } | |
23c2f041 | 5270 | } |
45389c47 | 5271 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 5272 | } |
a5766f11 | 5273 | |
fd086045 MK |
5274 | if (!rdev->desc->ops->get_voltage && |
5275 | !rdev->desc->ops->list_voltage && | |
5276 | !rdev->desc->fixed_uV) | |
5277 | rdev->is_switch = true; | |
5278 | ||
9177514c VZ |
5279 | ret = device_add(&rdev->dev); |
5280 | if (ret != 0) | |
c438b9d0 | 5281 | goto unset_supplies; |
c438b9d0 | 5282 | |
1130e5b3 | 5283 | rdev_init_debugfs(rdev); |
5e3ca2b3 | 5284 | |
f9503385 DO |
5285 | /* try to resolve regulators coupling since a new one was registered */ |
5286 | mutex_lock(®ulator_list_mutex); | |
5287 | regulator_resolve_coupling(rdev); | |
5288 | mutex_unlock(®ulator_list_mutex); | |
5289 | ||
5e3ca2b3 JMC |
5290 | /* try to resolve regulators supply since a new one was registered */ |
5291 | class_for_each_device(®ulator_class, NULL, NULL, | |
5292 | regulator_register_resolve_supply); | |
1b3de223 | 5293 | kfree(config); |
414c70cb | 5294 | return rdev; |
4fca9545 | 5295 | |
d4033b54 | 5296 | unset_supplies: |
45389c47 | 5297 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 5298 | unset_regulator_supplies(rdev); |
d8ca7d18 | 5299 | regulator_remove_coupling(rdev); |
45389c47 | 5300 | mutex_unlock(®ulator_list_mutex); |
32165230 | 5301 | wash: |
26c2c997 | 5302 | kfree(rdev->coupling_desc.coupled_rdevs); |
45389c47 | 5303 | mutex_lock(®ulator_list_mutex); |
32165230 | 5304 | regulator_ena_gpio_free(rdev); |
45389c47 | 5305 | mutex_unlock(®ulator_list_mutex); |
9177514c VZ |
5306 | put_device(&rdev->dev); |
5307 | rdev = NULL; | |
4fca9545 | 5308 | clean: |
0edb040d LW |
5309 | if (dangling_of_gpiod) |
5310 | gpiod_put(config->ena_gpiod); | |
9177514c | 5311 | kfree(rdev); |
a2151374 | 5312 | kfree(config); |
0edb040d LW |
5313 | rinse: |
5314 | if (dangling_cfg_gpiod) | |
5315 | gpiod_put(cfg->ena_gpiod); | |
a2151374 | 5316 | return ERR_PTR(ret); |
414c70cb LG |
5317 | } |
5318 | EXPORT_SYMBOL_GPL(regulator_register); | |
5319 | ||
5320 | /** | |
5321 | * regulator_unregister - unregister regulator | |
69279fb9 | 5322 | * @rdev: regulator to unregister |
414c70cb LG |
5323 | * |
5324 | * Called by regulator drivers to unregister a regulator. | |
5325 | */ | |
5326 | void regulator_unregister(struct regulator_dev *rdev) | |
5327 | { | |
5328 | if (rdev == NULL) | |
5329 | return; | |
5330 | ||
891636ea MB |
5331 | if (rdev->supply) { |
5332 | while (rdev->use_count--) | |
5333 | regulator_disable(rdev->supply); | |
e032b376 | 5334 | regulator_put(rdev->supply); |
891636ea | 5335 | } |
ff9b34b6 | 5336 | |
06377301 CK |
5337 | flush_work(&rdev->disable_work.work); |
5338 | ||
414c70cb | 5339 | mutex_lock(®ulator_list_mutex); |
ff9b34b6 | 5340 | |
1130e5b3 | 5341 | debugfs_remove_recursive(rdev->debugfs); |
6bf87d17 | 5342 | WARN_ON(rdev->open_count); |
6303f3e7 | 5343 | regulator_remove_coupling(rdev); |
0f1d747b | 5344 | unset_regulator_supplies(rdev); |
414c70cb | 5345 | list_del(&rdev->list); |
f19b00da | 5346 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 5347 | device_unregister(&rdev->dev); |
ff9b34b6 DO |
5348 | |
5349 | mutex_unlock(®ulator_list_mutex); | |
414c70cb LG |
5350 | } |
5351 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
5352 | ||
f7efad10 | 5353 | #ifdef CONFIG_SUSPEND |
414c70cb | 5354 | /** |
0380cf7d | 5355 | * regulator_suspend - prepare regulators for system wide suspend |
1efef7cc | 5356 | * @dev: ``&struct device`` pointer that is passed to _regulator_suspend() |
414c70cb LG |
5357 | * |
5358 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 5359 | */ |
0380cf7d | 5360 | static int regulator_suspend(struct device *dev) |
414c70cb | 5361 | { |
cd7e36ab | 5362 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5363 | suspend_state_t state = pm_suspend_target_state; |
cd7e36ab MS |
5364 | int ret; |
5365 | ||
5366 | regulator_lock(rdev); | |
5367 | ret = suspend_set_state(rdev, state); | |
5368 | regulator_unlock(rdev); | |
414c70cb | 5369 | |
cd7e36ab | 5370 | return ret; |
85f3b431 | 5371 | } |
d3e4eccb | 5372 | |
cd7e36ab | 5373 | static int regulator_resume(struct device *dev) |
85f3b431 | 5374 | { |
cd7e36ab | 5375 | suspend_state_t state = pm_suspend_target_state; |
85f3b431 | 5376 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 | 5377 | struct regulator_state *rstate; |
cd7e36ab | 5378 | int ret = 0; |
f7efad10 | 5379 | |
cd7e36ab | 5380 | rstate = regulator_get_suspend_state(rdev, state); |
f7efad10 | 5381 | if (rstate == NULL) |
35b5f14e | 5382 | return 0; |
414c70cb | 5383 | |
66cf9a7e | 5384 | regulator_lock(rdev); |
85f3b431 | 5385 | |
0380cf7d | 5386 | if (rdev->desc->ops->resume && |
f7efad10 CZ |
5387 | (rstate->enabled == ENABLE_IN_SUSPEND || |
5388 | rstate->enabled == DISABLE_IN_SUSPEND)) | |
0380cf7d | 5389 | ret = rdev->desc->ops->resume(rdev); |
f7efad10 | 5390 | |
66cf9a7e | 5391 | regulator_unlock(rdev); |
85f3b431 | 5392 | |
f7efad10 | 5393 | return ret; |
414c70cb | 5394 | } |
f7efad10 CZ |
5395 | #else /* !CONFIG_SUSPEND */ |
5396 | ||
0380cf7d | 5397 | #define regulator_suspend NULL |
5398 | #define regulator_resume NULL | |
f7efad10 CZ |
5399 | |
5400 | #endif /* !CONFIG_SUSPEND */ | |
5401 | ||
5402 | #ifdef CONFIG_PM | |
5403 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
0380cf7d | 5404 | .suspend = regulator_suspend, |
5405 | .resume = regulator_resume, | |
f7efad10 CZ |
5406 | }; |
5407 | #endif | |
5408 | ||
285c22de | 5409 | struct class regulator_class = { |
f7efad10 CZ |
5410 | .name = "regulator", |
5411 | .dev_release = regulator_dev_release, | |
5412 | .dev_groups = regulator_dev_groups, | |
5413 | #ifdef CONFIG_PM | |
5414 | .pm = ®ulator_pm_ops, | |
5415 | #endif | |
5416 | }; | |
ca725561 MB |
5417 | /** |
5418 | * regulator_has_full_constraints - the system has fully specified constraints | |
5419 | * | |
5420 | * Calling this function will cause the regulator API to disable all | |
5421 | * regulators which have a zero use count and don't have an always_on | |
5422 | * constraint in a late_initcall. | |
5423 | * | |
5424 | * The intention is that this will become the default behaviour in a | |
5425 | * future kernel release so users are encouraged to use this facility | |
5426 | * now. | |
5427 | */ | |
5428 | void regulator_has_full_constraints(void) | |
5429 | { | |
5430 | has_full_constraints = 1; | |
5431 | } | |
5432 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
5433 | ||
414c70cb LG |
5434 | /** |
5435 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 5436 | * @rdev: regulator |
414c70cb LG |
5437 | * |
5438 | * Get rdev regulator driver private data. This call can be used in the | |
5439 | * regulator driver context. | |
5440 | */ | |
5441 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
5442 | { | |
5443 | return rdev->reg_data; | |
5444 | } | |
5445 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
5446 | ||
5447 | /** | |
5448 | * regulator_get_drvdata - get regulator driver data | |
5449 | * @regulator: regulator | |
5450 | * | |
5451 | * Get regulator driver private data. This call can be used in the consumer | |
5452 | * driver context when non API regulator specific functions need to be called. | |
5453 | */ | |
5454 | void *regulator_get_drvdata(struct regulator *regulator) | |
5455 | { | |
5456 | return regulator->rdev->reg_data; | |
5457 | } | |
5458 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
5459 | ||
5460 | /** | |
5461 | * regulator_set_drvdata - set regulator driver data | |
5462 | * @regulator: regulator | |
5463 | * @data: data | |
5464 | */ | |
5465 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
5466 | { | |
5467 | regulator->rdev->reg_data = data; | |
5468 | } | |
5469 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
5470 | ||
5471 | /** | |
5472 | * regulator_get_id - get regulator ID | |
69279fb9 | 5473 | * @rdev: regulator |
414c70cb LG |
5474 | */ |
5475 | int rdev_get_id(struct regulator_dev *rdev) | |
5476 | { | |
5477 | return rdev->desc->id; | |
5478 | } | |
5479 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
5480 | ||
a5766f11 LG |
5481 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
5482 | { | |
5483 | return &rdev->dev; | |
5484 | } | |
5485 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
5486 | ||
03c87b95 BG |
5487 | struct regmap *rdev_get_regmap(struct regulator_dev *rdev) |
5488 | { | |
5489 | return rdev->regmap; | |
5490 | } | |
5491 | EXPORT_SYMBOL_GPL(rdev_get_regmap); | |
5492 | ||
a5766f11 LG |
5493 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) |
5494 | { | |
5495 | return reg_init_data->driver_data; | |
5496 | } | |
5497 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
5498 | ||
ba55a974 | 5499 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 5500 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 5501 | { |
ba55a974 MB |
5502 | struct regulator_map *map; |
5503 | ||
ba55a974 | 5504 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
5505 | seq_printf(sf, "%s -> %s.%s\n", |
5506 | rdev_get_name(map->regulator), map->dev_name, | |
5507 | map->supply); | |
ba55a974 MB |
5508 | } |
5509 | ||
dbc55955 HZ |
5510 | return 0; |
5511 | } | |
3e60b4fc | 5512 | DEFINE_SHOW_ATTRIBUTE(supply_map); |
ba55a974 | 5513 | |
85f3b431 TV |
5514 | struct summary_data { |
5515 | struct seq_file *s; | |
5516 | struct regulator_dev *parent; | |
5517 | int level; | |
5518 | }; | |
5519 | ||
5520 | static void regulator_summary_show_subtree(struct seq_file *s, | |
5521 | struct regulator_dev *rdev, | |
5522 | int level); | |
5523 | ||
5524 | static int regulator_summary_show_children(struct device *dev, void *data) | |
5525 | { | |
5526 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5527 | struct summary_data *summary_data = data; | |
5528 | ||
5529 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
5530 | regulator_summary_show_subtree(summary_data->s, rdev, | |
5531 | summary_data->level + 1); | |
5532 | ||
5533 | return 0; | |
5534 | } | |
5535 | ||
7c225ec9 HS |
5536 | static void regulator_summary_show_subtree(struct seq_file *s, |
5537 | struct regulator_dev *rdev, | |
5538 | int level) | |
5539 | { | |
7c225ec9 HS |
5540 | struct regulation_constraints *c; |
5541 | struct regulator *consumer; | |
85f3b431 | 5542 | struct summary_data summary_data; |
7e4d9683 | 5543 | unsigned int opmode; |
7c225ec9 HS |
5544 | |
5545 | if (!rdev) | |
5546 | return; | |
5547 | ||
7e4d9683 | 5548 | opmode = _regulator_get_mode_unlocked(rdev); |
01de19d0 | 5549 | seq_printf(s, "%*s%-*s %3d %4d %6d %7s ", |
7c225ec9 HS |
5550 | level * 3 + 1, "", |
5551 | 30 - level * 3, rdev_get_name(rdev), | |
01de19d0 | 5552 | rdev->use_count, rdev->open_count, rdev->bypass_count, |
7e4d9683 | 5553 | regulator_opmode_to_str(opmode)); |
7c225ec9 | 5554 | |
d22b85a1 | 5555 | seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000); |
7e4d9683 DA |
5556 | seq_printf(s, "%5dmA ", |
5557 | _regulator_get_current_limit_unlocked(rdev) / 1000); | |
7c225ec9 HS |
5558 | |
5559 | c = rdev->constraints; | |
5560 | if (c) { | |
5561 | switch (rdev->desc->type) { | |
5562 | case REGULATOR_VOLTAGE: | |
5563 | seq_printf(s, "%5dmV %5dmV ", | |
5564 | c->min_uV / 1000, c->max_uV / 1000); | |
5565 | break; | |
5566 | case REGULATOR_CURRENT: | |
5567 | seq_printf(s, "%5dmA %5dmA ", | |
5568 | c->min_uA / 1000, c->max_uA / 1000); | |
5569 | break; | |
5570 | } | |
5571 | } | |
5572 | ||
5573 | seq_puts(s, "\n"); | |
5574 | ||
5575 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 5576 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
5577 | continue; |
5578 | ||
5579 | seq_printf(s, "%*s%-*s ", | |
5580 | (level + 1) * 3 + 1, "", | |
e42a46b6 | 5581 | 30 - (level + 1) * 3, |
6b576eb0 | 5582 | consumer->supply_name ? consumer->supply_name : |
e42a46b6 | 5583 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); |
7c225ec9 HS |
5584 | |
5585 | switch (rdev->desc->type) { | |
5586 | case REGULATOR_VOLTAGE: | |
5451781d DA |
5587 | seq_printf(s, "%3d %33dmA%c%5dmV %5dmV", |
5588 | consumer->enable_count, | |
7d3827b5 | 5589 | consumer->uA_load / 1000, |
5451781d DA |
5590 | consumer->uA_load && !consumer->enable_count ? |
5591 | '*' : ' ', | |
c360a6df CZ |
5592 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
5593 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
5594 | break; |
5595 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
5596 | break; |
5597 | } | |
5598 | ||
5599 | seq_puts(s, "\n"); | |
5600 | } | |
5601 | ||
85f3b431 TV |
5602 | summary_data.s = s; |
5603 | summary_data.level = level; | |
5604 | summary_data.parent = rdev; | |
7c225ec9 | 5605 | |
85f3b431 TV |
5606 | class_for_each_device(®ulator_class, NULL, &summary_data, |
5607 | regulator_summary_show_children); | |
f8702f9e DO |
5608 | } |
5609 | ||
5610 | struct summary_lock_data { | |
5611 | struct ww_acquire_ctx *ww_ctx; | |
5612 | struct regulator_dev **new_contended_rdev; | |
5613 | struct regulator_dev **old_contended_rdev; | |
5614 | }; | |
5615 | ||
5616 | static int regulator_summary_lock_one(struct device *dev, void *data) | |
5617 | { | |
5618 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5619 | struct summary_lock_data *lock_data = data; | |
5620 | int ret = 0; | |
5621 | ||
5622 | if (rdev != *lock_data->old_contended_rdev) { | |
5623 | ret = regulator_lock_nested(rdev, lock_data->ww_ctx); | |
5624 | ||
5625 | if (ret == -EDEADLK) | |
5626 | *lock_data->new_contended_rdev = rdev; | |
5627 | else | |
5628 | WARN_ON_ONCE(ret); | |
5629 | } else { | |
5630 | *lock_data->old_contended_rdev = NULL; | |
5631 | } | |
5632 | ||
5633 | return ret; | |
5634 | } | |
5635 | ||
5636 | static int regulator_summary_unlock_one(struct device *dev, void *data) | |
5637 | { | |
5638 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
5639 | struct summary_lock_data *lock_data = data; | |
5640 | ||
5641 | if (lock_data) { | |
5642 | if (rdev == *lock_data->new_contended_rdev) | |
5643 | return -EDEADLK; | |
5644 | } | |
7e4d9683 DA |
5645 | |
5646 | regulator_unlock(rdev); | |
f8702f9e DO |
5647 | |
5648 | return 0; | |
5649 | } | |
5650 | ||
5651 | static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx, | |
5652 | struct regulator_dev **new_contended_rdev, | |
5653 | struct regulator_dev **old_contended_rdev) | |
5654 | { | |
5655 | struct summary_lock_data lock_data; | |
5656 | int ret; | |
5657 | ||
5658 | lock_data.ww_ctx = ww_ctx; | |
5659 | lock_data.new_contended_rdev = new_contended_rdev; | |
5660 | lock_data.old_contended_rdev = old_contended_rdev; | |
5661 | ||
5662 | ret = class_for_each_device(®ulator_class, NULL, &lock_data, | |
5663 | regulator_summary_lock_one); | |
5664 | if (ret) | |
5665 | class_for_each_device(®ulator_class, NULL, &lock_data, | |
5666 | regulator_summary_unlock_one); | |
5667 | ||
5668 | return ret; | |
5669 | } | |
5670 | ||
5671 | static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx) | |
5672 | { | |
5673 | struct regulator_dev *new_contended_rdev = NULL; | |
5674 | struct regulator_dev *old_contended_rdev = NULL; | |
5675 | int err; | |
5676 | ||
ff9b34b6 DO |
5677 | mutex_lock(®ulator_list_mutex); |
5678 | ||
f8702f9e DO |
5679 | ww_acquire_init(ww_ctx, ®ulator_ww_class); |
5680 | ||
5681 | do { | |
5682 | if (new_contended_rdev) { | |
5683 | ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx); | |
5684 | old_contended_rdev = new_contended_rdev; | |
5685 | old_contended_rdev->ref_cnt++; | |
5686 | } | |
5687 | ||
5688 | err = regulator_summary_lock_all(ww_ctx, | |
5689 | &new_contended_rdev, | |
5690 | &old_contended_rdev); | |
5691 | ||
5692 | if (old_contended_rdev) | |
5693 | regulator_unlock(old_contended_rdev); | |
5694 | ||
5695 | } while (err == -EDEADLK); | |
5696 | ||
5697 | ww_acquire_done(ww_ctx); | |
5698 | } | |
5699 | ||
5700 | static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx) | |
5701 | { | |
5702 | class_for_each_device(®ulator_class, NULL, NULL, | |
5703 | regulator_summary_unlock_one); | |
5704 | ww_acquire_fini(ww_ctx); | |
ff9b34b6 DO |
5705 | |
5706 | mutex_unlock(®ulator_list_mutex); | |
7c225ec9 HS |
5707 | } |
5708 | ||
85f3b431 | 5709 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 5710 | { |
85f3b431 TV |
5711 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5712 | struct seq_file *s = data; | |
7c225ec9 | 5713 | |
85f3b431 TV |
5714 | if (!rdev->supply) |
5715 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 5716 | |
85f3b431 TV |
5717 | return 0; |
5718 | } | |
7c225ec9 | 5719 | |
85f3b431 TV |
5720 | static int regulator_summary_show(struct seq_file *s, void *data) |
5721 | { | |
f8702f9e DO |
5722 | struct ww_acquire_ctx ww_ctx; |
5723 | ||
01de19d0 DA |
5724 | seq_puts(s, " regulator use open bypass opmode voltage current min max\n"); |
5725 | seq_puts(s, "---------------------------------------------------------------------------------------\n"); | |
7c225ec9 | 5726 | |
f8702f9e DO |
5727 | regulator_summary_lock(&ww_ctx); |
5728 | ||
85f3b431 TV |
5729 | class_for_each_device(®ulator_class, NULL, s, |
5730 | regulator_summary_show_roots); | |
7c225ec9 | 5731 | |
f8702f9e DO |
5732 | regulator_summary_unlock(&ww_ctx); |
5733 | ||
7c225ec9 HS |
5734 | return 0; |
5735 | } | |
3e60b4fc YL |
5736 | DEFINE_SHOW_ATTRIBUTE(regulator_summary); |
5737 | #endif /* CONFIG_DEBUG_FS */ | |
7c225ec9 | 5738 | |
414c70cb LG |
5739 | static int __init regulator_init(void) |
5740 | { | |
34abbd68 MB |
5741 | int ret; |
5742 | ||
34abbd68 MB |
5743 | ret = class_register(®ulator_class); |
5744 | ||
1130e5b3 | 5745 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 5746 | if (!debugfs_root) |
1130e5b3 | 5747 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 5748 | |
3e60b4fc | 5749 | #ifdef CONFIG_DEBUG_FS |
f4d562c6 MB |
5750 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
5751 | &supply_map_fops); | |
1130e5b3 | 5752 | |
7c225ec9 | 5753 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 5754 | NULL, ®ulator_summary_fops); |
3e60b4fc | 5755 | #endif |
34abbd68 MB |
5756 | regulator_dummy_init(); |
5757 | ||
d8ca7d18 DO |
5758 | regulator_coupler_register(&generic_regulator_coupler); |
5759 | ||
34abbd68 | 5760 | return ret; |
414c70cb LG |
5761 | } |
5762 | ||
5763 | /* init early to allow our consumers to complete system booting */ | |
5764 | core_initcall(regulator_init); | |
ca725561 | 5765 | |
55576cf1 | 5766 | static int regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 5767 | { |
609ca5f3 MB |
5768 | struct regulator_dev *rdev = dev_to_rdev(dev); |
5769 | const struct regulator_ops *ops = rdev->desc->ops; | |
5770 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 5771 | int enabled, ret; |
ca725561 | 5772 | |
609ca5f3 MB |
5773 | if (c && c->always_on) |
5774 | return 0; | |
5775 | ||
8a34e979 | 5776 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
5777 | return 0; |
5778 | ||
66cf9a7e | 5779 | regulator_lock(rdev); |
609ca5f3 MB |
5780 | |
5781 | if (rdev->use_count) | |
5782 | goto unlock; | |
5783 | ||
5784 | /* If we can't read the status assume it's on. */ | |
5785 | if (ops->is_enabled) | |
5786 | enabled = ops->is_enabled(rdev); | |
5787 | else | |
5788 | enabled = 1; | |
5789 | ||
5790 | if (!enabled) | |
5791 | goto unlock; | |
5792 | ||
5793 | if (have_full_constraints()) { | |
5794 | /* We log since this may kill the system if it goes | |
5795 | * wrong. */ | |
5796 | rdev_info(rdev, "disabling\n"); | |
5797 | ret = _regulator_do_disable(rdev); | |
5798 | if (ret != 0) | |
5799 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
5800 | } else { | |
5801 | /* The intention is that in future we will | |
5802 | * assume that full constraints are provided | |
5803 | * so warn even if we aren't going to do | |
5804 | * anything here. | |
5805 | */ | |
5806 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
5807 | } | |
5808 | ||
5809 | unlock: | |
66cf9a7e | 5810 | regulator_unlock(rdev); |
609ca5f3 MB |
5811 | |
5812 | return 0; | |
5813 | } | |
5814 | ||
55576cf1 | 5815 | static void regulator_init_complete_work_function(struct work_struct *work) |
609ca5f3 | 5816 | { |
3827b64d JMC |
5817 | /* |
5818 | * Regulators may had failed to resolve their input supplies | |
5819 | * when were registered, either because the input supply was | |
5820 | * not registered yet or because its parent device was not | |
5821 | * bound yet. So attempt to resolve the input supplies for | |
5822 | * pending regulators before trying to disable unused ones. | |
5823 | */ | |
5824 | class_for_each_device(®ulator_class, NULL, NULL, | |
5825 | regulator_register_resolve_supply); | |
5826 | ||
ca725561 | 5827 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
5828 | * we have permission to change the status for and which are |
5829 | * not in use or always_on. This is effectively the default | |
5830 | * for DT and ACPI as they have full constraints. | |
ca725561 | 5831 | */ |
609ca5f3 MB |
5832 | class_for_each_device(®ulator_class, NULL, NULL, |
5833 | regulator_late_cleanup); | |
55576cf1 MB |
5834 | } |
5835 | ||
5836 | static DECLARE_DELAYED_WORK(regulator_init_complete_work, | |
5837 | regulator_init_complete_work_function); | |
5838 | ||
5839 | static int __init regulator_init_complete(void) | |
5840 | { | |
5841 | /* | |
5842 | * Since DT doesn't provide an idiomatic mechanism for | |
5843 | * enabling full constraints and since it's much more natural | |
5844 | * with DT to provide them just assume that a DT enabled | |
5845 | * system has full constraints. | |
5846 | */ | |
5847 | if (of_have_populated_dt()) | |
5848 | has_full_constraints = true; | |
5849 | ||
5850 | /* | |
2a15483b JS |
5851 | * We punt completion for an arbitrary amount of time since |
5852 | * systems like distros will load many drivers from userspace | |
5853 | * so consumers might not always be ready yet, this is | |
5854 | * particularly an issue with laptops where this might bounce | |
5855 | * the display off then on. Ideally we'd get a notification | |
5856 | * from userspace when this happens but we don't so just wait | |
5857 | * a bit and hope we waited long enough. It'd be better if | |
5858 | * we'd only do this on systems that need it, and a kernel | |
5859 | * command line option might be useful. | |
55576cf1 | 5860 | */ |
2a15483b JS |
5861 | schedule_delayed_work(®ulator_init_complete_work, |
5862 | msecs_to_jiffies(30000)); | |
ca725561 MB |
5863 | |
5864 | return 0; | |
5865 | } | |
fd482a3e | 5866 | late_initcall_sync(regulator_init_complete); |