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Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb | 53 | static DEFINE_MUTEX(regulator_list_mutex); |
414c70cb | 54 | static LIST_HEAD(regulator_map_list); |
f19b00da | 55 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 56 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 57 | static bool has_full_constraints; |
414c70cb | 58 | |
1130e5b3 | 59 | static struct dentry *debugfs_root; |
1130e5b3 | 60 | |
8dc5390d | 61 | /* |
414c70cb LG |
62 | * struct regulator_map |
63 | * | |
64 | * Used to provide symbolic supply names to devices. | |
65 | */ | |
66 | struct regulator_map { | |
67 | struct list_head list; | |
40f9244f | 68 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 69 | const char *supply; |
a5766f11 | 70 | struct regulator_dev *regulator; |
414c70cb LG |
71 | }; |
72 | ||
f19b00da KM |
73 | /* |
74 | * struct regulator_enable_gpio | |
75 | * | |
76 | * Management for shared enable GPIO pin | |
77 | */ | |
78 | struct regulator_enable_gpio { | |
79 | struct list_head list; | |
778b28b4 | 80 | struct gpio_desc *gpiod; |
f19b00da KM |
81 | u32 enable_count; /* a number of enabled shared GPIO */ |
82 | u32 request_count; /* a number of requested shared GPIO */ | |
83 | unsigned int ena_gpio_invert:1; | |
84 | }; | |
85 | ||
a06ccd9c CK |
86 | /* |
87 | * struct regulator_supply_alias | |
88 | * | |
89 | * Used to map lookups for a supply onto an alternative device. | |
90 | */ | |
91 | struct regulator_supply_alias { | |
92 | struct list_head list; | |
93 | struct device *src_dev; | |
94 | const char *src_supply; | |
95 | struct device *alias_dev; | |
96 | const char *alias_supply; | |
97 | }; | |
98 | ||
414c70cb | 99 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 100 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
101 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
102 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
103 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 104 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 105 | unsigned long event, void *data); |
75790251 MB |
106 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
107 | int min_uV, int max_uV); | |
3801b86a MB |
108 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
109 | struct device *dev, | |
110 | const char *supply_name); | |
36a1f1b6 | 111 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 112 | |
1083c393 MB |
113 | static const char *rdev_get_name(struct regulator_dev *rdev) |
114 | { | |
115 | if (rdev->constraints && rdev->constraints->name) | |
116 | return rdev->constraints->name; | |
117 | else if (rdev->desc->name) | |
118 | return rdev->desc->name; | |
119 | else | |
120 | return ""; | |
121 | } | |
122 | ||
87b28417 MB |
123 | static bool have_full_constraints(void) |
124 | { | |
75bc9641 | 125 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
126 | } |
127 | ||
8a34e979 WP |
128 | static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops) |
129 | { | |
130 | if (!rdev->constraints) { | |
131 | rdev_err(rdev, "no constraints\n"); | |
132 | return false; | |
133 | } | |
134 | ||
135 | if (rdev->constraints->valid_ops_mask & ops) | |
136 | return true; | |
137 | ||
138 | return false; | |
139 | } | |
140 | ||
70a7fb80 TR |
141 | static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev) |
142 | { | |
143 | if (rdev && rdev->supply) | |
144 | return rdev->supply->rdev; | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
9f01cd4a SH |
149 | /** |
150 | * regulator_lock_supply - lock a regulator and its supplies | |
151 | * @rdev: regulator source | |
152 | */ | |
153 | static void regulator_lock_supply(struct regulator_dev *rdev) | |
154 | { | |
fa731ac7 | 155 | int i; |
9f01cd4a | 156 | |
70a7fb80 | 157 | for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++) |
fa731ac7 | 158 | mutex_lock_nested(&rdev->mutex, i); |
9f01cd4a SH |
159 | } |
160 | ||
161 | /** | |
162 | * regulator_unlock_supply - unlock a regulator and its supplies | |
163 | * @rdev: regulator source | |
164 | */ | |
165 | static void regulator_unlock_supply(struct regulator_dev *rdev) | |
166 | { | |
167 | struct regulator *supply; | |
168 | ||
169 | while (1) { | |
170 | mutex_unlock(&rdev->mutex); | |
171 | supply = rdev->supply; | |
172 | ||
173 | if (!rdev->supply) | |
174 | return; | |
175 | ||
176 | rdev = supply->rdev; | |
177 | } | |
178 | } | |
179 | ||
69511a45 RN |
180 | /** |
181 | * of_get_regulator - get a regulator device node based on supply name | |
182 | * @dev: Device pointer for the consumer (of regulator) device | |
183 | * @supply: regulator supply name | |
184 | * | |
185 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 186 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
187 | * returns NULL. |
188 | */ | |
189 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
190 | { | |
191 | struct device_node *regnode = NULL; | |
192 | char prop_name[32]; /* 32 is max size of property name */ | |
193 | ||
194 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
195 | ||
196 | snprintf(prop_name, 32, "%s-supply", supply); | |
197 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
198 | ||
199 | if (!regnode) { | |
7799167b RH |
200 | dev_dbg(dev, "Looking up %s property in node %pOF failed\n", |
201 | prop_name, dev->of_node); | |
69511a45 RN |
202 | return NULL; |
203 | } | |
204 | return regnode; | |
205 | } | |
206 | ||
414c70cb LG |
207 | /* Platform voltage constraint check */ |
208 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
209 | int *min_uV, int *max_uV) | |
210 | { | |
211 | BUG_ON(*min_uV > *max_uV); | |
212 | ||
8a34e979 | 213 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
7ebcf26c | 214 | rdev_err(rdev, "voltage operation not allowed\n"); |
414c70cb LG |
215 | return -EPERM; |
216 | } | |
217 | ||
218 | if (*max_uV > rdev->constraints->max_uV) | |
219 | *max_uV = rdev->constraints->max_uV; | |
220 | if (*min_uV < rdev->constraints->min_uV) | |
221 | *min_uV = rdev->constraints->min_uV; | |
222 | ||
89f425ed MB |
223 | if (*min_uV > *max_uV) { |
224 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 225 | *min_uV, *max_uV); |
414c70cb | 226 | return -EINVAL; |
89f425ed | 227 | } |
414c70cb LG |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
f7efad10 CZ |
232 | /* return 0 if the state is valid */ |
233 | static int regulator_check_states(suspend_state_t state) | |
234 | { | |
235 | return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE); | |
236 | } | |
237 | ||
05fda3b1 TP |
238 | /* Make sure we select a voltage that suits the needs of all |
239 | * regulator consumers | |
240 | */ | |
241 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
c360a6df CZ |
242 | int *min_uV, int *max_uV, |
243 | suspend_state_t state) | |
05fda3b1 TP |
244 | { |
245 | struct regulator *regulator; | |
c360a6df | 246 | struct regulator_voltage *voltage; |
05fda3b1 TP |
247 | |
248 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
c360a6df | 249 | voltage = ®ulator->voltage[state]; |
4aa922c0 MB |
250 | /* |
251 | * Assume consumers that didn't say anything are OK | |
252 | * with anything in the constraint range. | |
253 | */ | |
c360a6df | 254 | if (!voltage->min_uV && !voltage->max_uV) |
4aa922c0 MB |
255 | continue; |
256 | ||
c360a6df CZ |
257 | if (*max_uV > voltage->max_uV) |
258 | *max_uV = voltage->max_uV; | |
259 | if (*min_uV < voltage->min_uV) | |
260 | *min_uV = voltage->min_uV; | |
05fda3b1 TP |
261 | } |
262 | ||
dd8004af | 263 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
264 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
265 | *min_uV, *max_uV); | |
05fda3b1 | 266 | return -EINVAL; |
dd8004af | 267 | } |
05fda3b1 TP |
268 | |
269 | return 0; | |
270 | } | |
271 | ||
414c70cb LG |
272 | /* current constraint check */ |
273 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
274 | int *min_uA, int *max_uA) | |
275 | { | |
276 | BUG_ON(*min_uA > *max_uA); | |
277 | ||
8a34e979 | 278 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) { |
7ebcf26c | 279 | rdev_err(rdev, "current operation not allowed\n"); |
414c70cb LG |
280 | return -EPERM; |
281 | } | |
282 | ||
283 | if (*max_uA > rdev->constraints->max_uA) | |
284 | *max_uA = rdev->constraints->max_uA; | |
285 | if (*min_uA < rdev->constraints->min_uA) | |
286 | *min_uA = rdev->constraints->min_uA; | |
287 | ||
89f425ed MB |
288 | if (*min_uA > *max_uA) { |
289 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 290 | *min_uA, *max_uA); |
414c70cb | 291 | return -EINVAL; |
89f425ed | 292 | } |
414c70cb LG |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /* operating mode constraint check */ | |
109c75af CK |
298 | static int regulator_mode_constrain(struct regulator_dev *rdev, |
299 | unsigned int *mode) | |
414c70cb | 300 | { |
2c608234 | 301 | switch (*mode) { |
e573520b DB |
302 | case REGULATOR_MODE_FAST: |
303 | case REGULATOR_MODE_NORMAL: | |
304 | case REGULATOR_MODE_IDLE: | |
305 | case REGULATOR_MODE_STANDBY: | |
306 | break; | |
307 | default: | |
89f425ed | 308 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
309 | return -EINVAL; |
310 | } | |
311 | ||
8a34e979 | 312 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) { |
7ebcf26c | 313 | rdev_err(rdev, "mode operation not allowed\n"); |
414c70cb LG |
314 | return -EPERM; |
315 | } | |
2c608234 MB |
316 | |
317 | /* The modes are bitmasks, the most power hungry modes having | |
318 | * the lowest values. If the requested mode isn't supported | |
319 | * try higher modes. */ | |
320 | while (*mode) { | |
321 | if (rdev->constraints->valid_modes_mask & *mode) | |
322 | return 0; | |
323 | *mode /= 2; | |
414c70cb | 324 | } |
2c608234 MB |
325 | |
326 | return -EINVAL; | |
414c70cb LG |
327 | } |
328 | ||
f7efad10 CZ |
329 | static inline struct regulator_state * |
330 | regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state) | |
331 | { | |
332 | if (rdev->constraints == NULL) | |
333 | return NULL; | |
334 | ||
335 | switch (state) { | |
336 | case PM_SUSPEND_STANDBY: | |
337 | return &rdev->constraints->state_standby; | |
338 | case PM_SUSPEND_MEM: | |
339 | return &rdev->constraints->state_mem; | |
340 | case PM_SUSPEND_MAX: | |
341 | return &rdev->constraints->state_disk; | |
342 | default: | |
343 | return NULL; | |
344 | } | |
345 | } | |
346 | ||
414c70cb LG |
347 | static ssize_t regulator_uV_show(struct device *dev, |
348 | struct device_attribute *attr, char *buf) | |
349 | { | |
a5766f11 | 350 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
351 | ssize_t ret; |
352 | ||
353 | mutex_lock(&rdev->mutex); | |
354 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
355 | mutex_unlock(&rdev->mutex); | |
356 | ||
357 | return ret; | |
358 | } | |
7ad68e2f | 359 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
360 | |
361 | static ssize_t regulator_uA_show(struct device *dev, | |
362 | struct device_attribute *attr, char *buf) | |
363 | { | |
a5766f11 | 364 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
365 | |
366 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
367 | } | |
7ad68e2f | 368 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 369 | |
587cea27 GKH |
370 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
371 | char *buf) | |
bc558a60 MB |
372 | { |
373 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 374 | |
1083c393 | 375 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 376 | } |
587cea27 | 377 | static DEVICE_ATTR_RO(name); |
bc558a60 | 378 | |
4fca9545 | 379 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 380 | { |
414c70cb LG |
381 | switch (mode) { |
382 | case REGULATOR_MODE_FAST: | |
383 | return sprintf(buf, "fast\n"); | |
384 | case REGULATOR_MODE_NORMAL: | |
385 | return sprintf(buf, "normal\n"); | |
386 | case REGULATOR_MODE_IDLE: | |
387 | return sprintf(buf, "idle\n"); | |
388 | case REGULATOR_MODE_STANDBY: | |
389 | return sprintf(buf, "standby\n"); | |
390 | } | |
391 | return sprintf(buf, "unknown\n"); | |
392 | } | |
393 | ||
4fca9545 DB |
394 | static ssize_t regulator_opmode_show(struct device *dev, |
395 | struct device_attribute *attr, char *buf) | |
414c70cb | 396 | { |
a5766f11 | 397 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 398 | |
4fca9545 DB |
399 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
400 | } | |
7ad68e2f | 401 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
402 | |
403 | static ssize_t regulator_print_state(char *buf, int state) | |
404 | { | |
414c70cb LG |
405 | if (state > 0) |
406 | return sprintf(buf, "enabled\n"); | |
407 | else if (state == 0) | |
408 | return sprintf(buf, "disabled\n"); | |
409 | else | |
410 | return sprintf(buf, "unknown\n"); | |
411 | } | |
412 | ||
4fca9545 DB |
413 | static ssize_t regulator_state_show(struct device *dev, |
414 | struct device_attribute *attr, char *buf) | |
415 | { | |
416 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
417 | ssize_t ret; |
418 | ||
419 | mutex_lock(&rdev->mutex); | |
420 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
421 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 422 | |
9332546f | 423 | return ret; |
4fca9545 | 424 | } |
7ad68e2f | 425 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 426 | |
853116a1 DB |
427 | static ssize_t regulator_status_show(struct device *dev, |
428 | struct device_attribute *attr, char *buf) | |
429 | { | |
430 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
431 | int status; | |
432 | char *label; | |
433 | ||
434 | status = rdev->desc->ops->get_status(rdev); | |
435 | if (status < 0) | |
436 | return status; | |
437 | ||
438 | switch (status) { | |
439 | case REGULATOR_STATUS_OFF: | |
440 | label = "off"; | |
441 | break; | |
442 | case REGULATOR_STATUS_ON: | |
443 | label = "on"; | |
444 | break; | |
445 | case REGULATOR_STATUS_ERROR: | |
446 | label = "error"; | |
447 | break; | |
448 | case REGULATOR_STATUS_FAST: | |
449 | label = "fast"; | |
450 | break; | |
451 | case REGULATOR_STATUS_NORMAL: | |
452 | label = "normal"; | |
453 | break; | |
454 | case REGULATOR_STATUS_IDLE: | |
455 | label = "idle"; | |
456 | break; | |
457 | case REGULATOR_STATUS_STANDBY: | |
458 | label = "standby"; | |
459 | break; | |
f59c8f9f MB |
460 | case REGULATOR_STATUS_BYPASS: |
461 | label = "bypass"; | |
462 | break; | |
1beaf762 KG |
463 | case REGULATOR_STATUS_UNDEFINED: |
464 | label = "undefined"; | |
465 | break; | |
853116a1 DB |
466 | default: |
467 | return -ERANGE; | |
468 | } | |
469 | ||
470 | return sprintf(buf, "%s\n", label); | |
471 | } | |
472 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
473 | ||
414c70cb LG |
474 | static ssize_t regulator_min_uA_show(struct device *dev, |
475 | struct device_attribute *attr, char *buf) | |
476 | { | |
a5766f11 | 477 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
478 | |
479 | if (!rdev->constraints) | |
480 | return sprintf(buf, "constraint not defined\n"); | |
481 | ||
482 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
483 | } | |
7ad68e2f | 484 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
485 | |
486 | static ssize_t regulator_max_uA_show(struct device *dev, | |
487 | struct device_attribute *attr, char *buf) | |
488 | { | |
a5766f11 | 489 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
490 | |
491 | if (!rdev->constraints) | |
492 | return sprintf(buf, "constraint not defined\n"); | |
493 | ||
494 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
495 | } | |
7ad68e2f | 496 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
497 | |
498 | static ssize_t regulator_min_uV_show(struct device *dev, | |
499 | struct device_attribute *attr, char *buf) | |
500 | { | |
a5766f11 | 501 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
502 | |
503 | if (!rdev->constraints) | |
504 | return sprintf(buf, "constraint not defined\n"); | |
505 | ||
506 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
507 | } | |
7ad68e2f | 508 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
509 | |
510 | static ssize_t regulator_max_uV_show(struct device *dev, | |
511 | struct device_attribute *attr, char *buf) | |
512 | { | |
a5766f11 | 513 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
514 | |
515 | if (!rdev->constraints) | |
516 | return sprintf(buf, "constraint not defined\n"); | |
517 | ||
518 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
519 | } | |
7ad68e2f | 520 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
521 | |
522 | static ssize_t regulator_total_uA_show(struct device *dev, | |
523 | struct device_attribute *attr, char *buf) | |
524 | { | |
a5766f11 | 525 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
526 | struct regulator *regulator; |
527 | int uA = 0; | |
528 | ||
529 | mutex_lock(&rdev->mutex); | |
530 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 531 | uA += regulator->uA_load; |
414c70cb LG |
532 | mutex_unlock(&rdev->mutex); |
533 | return sprintf(buf, "%d\n", uA); | |
534 | } | |
7ad68e2f | 535 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 536 | |
587cea27 GKH |
537 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
538 | char *buf) | |
414c70cb | 539 | { |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
541 | return sprintf(buf, "%d\n", rdev->use_count); |
542 | } | |
587cea27 | 543 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 544 | |
587cea27 GKH |
545 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
546 | char *buf) | |
414c70cb | 547 | { |
a5766f11 | 548 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
549 | |
550 | switch (rdev->desc->type) { | |
551 | case REGULATOR_VOLTAGE: | |
552 | return sprintf(buf, "voltage\n"); | |
553 | case REGULATOR_CURRENT: | |
554 | return sprintf(buf, "current\n"); | |
555 | } | |
556 | return sprintf(buf, "unknown\n"); | |
557 | } | |
587cea27 | 558 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
559 | |
560 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
561 | struct device_attribute *attr, char *buf) | |
562 | { | |
a5766f11 | 563 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 564 | |
414c70cb LG |
565 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
566 | } | |
7ad68e2f DB |
567 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
568 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
569 | |
570 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
571 | struct device_attribute *attr, char *buf) | |
572 | { | |
a5766f11 | 573 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 574 | |
414c70cb LG |
575 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
576 | } | |
7ad68e2f DB |
577 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
578 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
579 | |
580 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
581 | struct device_attribute *attr, char *buf) | |
582 | { | |
a5766f11 | 583 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 584 | |
414c70cb LG |
585 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
586 | } | |
7ad68e2f DB |
587 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
588 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 589 | |
414c70cb LG |
590 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
a5766f11 | 593 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 594 | |
4fca9545 DB |
595 | return regulator_print_opmode(buf, |
596 | rdev->constraints->state_mem.mode); | |
414c70cb | 597 | } |
7ad68e2f DB |
598 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
599 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
600 | |
601 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
602 | struct device_attribute *attr, char *buf) | |
603 | { | |
a5766f11 | 604 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 605 | |
4fca9545 DB |
606 | return regulator_print_opmode(buf, |
607 | rdev->constraints->state_disk.mode); | |
414c70cb | 608 | } |
7ad68e2f DB |
609 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
610 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
611 | |
612 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
613 | struct device_attribute *attr, char *buf) | |
614 | { | |
a5766f11 | 615 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 616 | |
4fca9545 DB |
617 | return regulator_print_opmode(buf, |
618 | rdev->constraints->state_standby.mode); | |
414c70cb | 619 | } |
7ad68e2f DB |
620 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
621 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
622 | |
623 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
624 | struct device_attribute *attr, char *buf) | |
625 | { | |
a5766f11 | 626 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 627 | |
4fca9545 DB |
628 | return regulator_print_state(buf, |
629 | rdev->constraints->state_mem.enabled); | |
414c70cb | 630 | } |
7ad68e2f DB |
631 | static DEVICE_ATTR(suspend_mem_state, 0444, |
632 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
633 | |
634 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
635 | struct device_attribute *attr, char *buf) | |
636 | { | |
a5766f11 | 637 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 638 | |
4fca9545 DB |
639 | return regulator_print_state(buf, |
640 | rdev->constraints->state_disk.enabled); | |
414c70cb | 641 | } |
7ad68e2f DB |
642 | static DEVICE_ATTR(suspend_disk_state, 0444, |
643 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
644 | |
645 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
646 | struct device_attribute *attr, char *buf) | |
647 | { | |
a5766f11 | 648 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 649 | |
4fca9545 DB |
650 | return regulator_print_state(buf, |
651 | rdev->constraints->state_standby.enabled); | |
414c70cb | 652 | } |
7ad68e2f DB |
653 | static DEVICE_ATTR(suspend_standby_state, 0444, |
654 | regulator_suspend_standby_state_show, NULL); | |
655 | ||
f59c8f9f MB |
656 | static ssize_t regulator_bypass_show(struct device *dev, |
657 | struct device_attribute *attr, char *buf) | |
658 | { | |
659 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
660 | const char *report; | |
661 | bool bypass; | |
662 | int ret; | |
663 | ||
664 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
665 | ||
666 | if (ret != 0) | |
667 | report = "unknown"; | |
668 | else if (bypass) | |
669 | report = "enabled"; | |
670 | else | |
671 | report = "disabled"; | |
672 | ||
673 | return sprintf(buf, "%s\n", report); | |
674 | } | |
675 | static DEVICE_ATTR(bypass, 0444, | |
676 | regulator_bypass_show, NULL); | |
bc558a60 | 677 | |
414c70cb LG |
678 | /* Calculate the new optimum regulator operating mode based on the new total |
679 | * consumer load. All locks held by caller */ | |
8460ef38 | 680 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
681 | { |
682 | struct regulator *sibling; | |
683 | int current_uA = 0, output_uV, input_uV, err; | |
684 | unsigned int mode; | |
685 | ||
70cfef26 KK |
686 | lockdep_assert_held_once(&rdev->mutex); |
687 | ||
8460ef38 BA |
688 | /* |
689 | * first check to see if we can set modes at all, otherwise just | |
690 | * tell the consumer everything is OK. | |
691 | */ | |
8a34e979 | 692 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
8460ef38 BA |
693 | return 0; |
694 | ||
8f4490e0 BA |
695 | if (!rdev->desc->ops->get_optimum_mode && |
696 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
697 | return 0; |
698 | ||
8f4490e0 BA |
699 | if (!rdev->desc->ops->set_mode && |
700 | !rdev->desc->ops->set_load) | |
8460ef38 | 701 | return -EINVAL; |
414c70cb | 702 | |
414c70cb LG |
703 | /* calc total requested load */ |
704 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 705 | current_uA += sibling->uA_load; |
414c70cb | 706 | |
22a10bca SB |
707 | current_uA += rdev->constraints->system_load; |
708 | ||
8f4490e0 BA |
709 | if (rdev->desc->ops->set_load) { |
710 | /* set the optimum mode for our new total regulator load */ | |
711 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
712 | if (err < 0) | |
713 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
714 | } else { | |
57776617 JP |
715 | /* get output voltage */ |
716 | output_uV = _regulator_get_voltage(rdev); | |
717 | if (output_uV <= 0) { | |
718 | rdev_err(rdev, "invalid output voltage found\n"); | |
719 | return -EINVAL; | |
720 | } | |
721 | ||
722 | /* get input voltage */ | |
723 | input_uV = 0; | |
724 | if (rdev->supply) | |
725 | input_uV = regulator_get_voltage(rdev->supply); | |
726 | if (input_uV <= 0) | |
727 | input_uV = rdev->constraints->input_uV; | |
728 | if (input_uV <= 0) { | |
729 | rdev_err(rdev, "invalid input voltage found\n"); | |
730 | return -EINVAL; | |
731 | } | |
732 | ||
8f4490e0 BA |
733 | /* now get the optimum mode for our new total regulator load */ |
734 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
735 | output_uV, current_uA); | |
736 | ||
737 | /* check the new mode is allowed */ | |
738 | err = regulator_mode_constrain(rdev, &mode); | |
739 | if (err < 0) { | |
740 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
741 | current_uA, input_uV, output_uV); | |
742 | return err; | |
743 | } | |
414c70cb | 744 | |
8f4490e0 BA |
745 | err = rdev->desc->ops->set_mode(rdev, mode); |
746 | if (err < 0) | |
747 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
748 | } |
749 | ||
8460ef38 | 750 | return err; |
414c70cb LG |
751 | } |
752 | ||
753 | static int suspend_set_state(struct regulator_dev *rdev, | |
f7efad10 | 754 | suspend_state_t state) |
414c70cb LG |
755 | { |
756 | int ret = 0; | |
f7efad10 CZ |
757 | struct regulator_state *rstate; |
758 | ||
759 | rstate = regulator_get_suspend_state(rdev, state); | |
760 | if (rstate == NULL) | |
761 | return -EINVAL; | |
638f85c5 MB |
762 | |
763 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
764 | * only warn if the driver implements set_suspend_voltage or |
765 | * set_suspend_mode callback. | |
638f85c5 | 766 | */ |
72069f99 CZ |
767 | if (rstate->enabled != ENABLE_IN_SUSPEND && |
768 | rstate->enabled != DISABLE_IN_SUSPEND) { | |
8ac0e95d AL |
769 | if (rdev->desc->ops->set_suspend_voltage || |
770 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 771 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
772 | return 0; |
773 | } | |
774 | ||
72069f99 CZ |
775 | if (rstate->enabled == ENABLE_IN_SUSPEND && |
776 | rdev->desc->ops->set_suspend_enable) | |
414c70cb | 777 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
72069f99 CZ |
778 | else if (rstate->enabled == DISABLE_IN_SUSPEND && |
779 | rdev->desc->ops->set_suspend_disable) | |
414c70cb | 780 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
781 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
782 | ret = 0; | |
783 | ||
414c70cb | 784 | if (ret < 0) { |
5da84fd9 | 785 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
786 | return ret; |
787 | } | |
788 | ||
789 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
790 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
791 | if (ret < 0) { | |
5da84fd9 | 792 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
793 | return ret; |
794 | } | |
795 | } | |
796 | ||
797 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
798 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
799 | if (ret < 0) { | |
5da84fd9 | 800 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
801 | return ret; |
802 | } | |
803 | } | |
414c70cb | 804 | |
f7efad10 | 805 | return ret; |
414c70cb LG |
806 | } |
807 | ||
808 | static void print_constraints(struct regulator_dev *rdev) | |
809 | { | |
810 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 811 | char buf[160] = ""; |
5751a99f | 812 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
813 | int count = 0; |
814 | int ret; | |
414c70cb | 815 | |
8f031b48 | 816 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 817 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
818 | count += scnprintf(buf + count, len - count, "%d mV ", |
819 | constraints->min_uV / 1000); | |
414c70cb | 820 | else |
5751a99f SW |
821 | count += scnprintf(buf + count, len - count, |
822 | "%d <--> %d mV ", | |
823 | constraints->min_uV / 1000, | |
824 | constraints->max_uV / 1000); | |
8f031b48 MB |
825 | } |
826 | ||
827 | if (!constraints->min_uV || | |
828 | constraints->min_uV != constraints->max_uV) { | |
829 | ret = _regulator_get_voltage(rdev); | |
830 | if (ret > 0) | |
5751a99f SW |
831 | count += scnprintf(buf + count, len - count, |
832 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
833 | } |
834 | ||
bf5892a8 | 835 | if (constraints->uV_offset) |
5751a99f SW |
836 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
837 | constraints->uV_offset / 1000); | |
bf5892a8 | 838 | |
8f031b48 | 839 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 840 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
841 | count += scnprintf(buf + count, len - count, "%d mA ", |
842 | constraints->min_uA / 1000); | |
414c70cb | 843 | else |
5751a99f SW |
844 | count += scnprintf(buf + count, len - count, |
845 | "%d <--> %d mA ", | |
846 | constraints->min_uA / 1000, | |
847 | constraints->max_uA / 1000); | |
8f031b48 MB |
848 | } |
849 | ||
850 | if (!constraints->min_uA || | |
851 | constraints->min_uA != constraints->max_uA) { | |
852 | ret = _regulator_get_current_limit(rdev); | |
853 | if (ret > 0) | |
5751a99f SW |
854 | count += scnprintf(buf + count, len - count, |
855 | "at %d mA ", ret / 1000); | |
414c70cb | 856 | } |
8f031b48 | 857 | |
414c70cb | 858 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 859 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 860 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 861 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 862 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 863 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 864 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 865 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 866 | |
215b8b05 | 867 | if (!count) |
5751a99f | 868 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 869 | |
194dbaef | 870 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
871 | |
872 | if ((constraints->min_uV != constraints->max_uV) && | |
8a34e979 | 873 | !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) |
4a682922 MB |
874 | rdev_warn(rdev, |
875 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
876 | } |
877 | ||
e79055d6 | 878 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 879 | struct regulation_constraints *constraints) |
a5766f11 | 880 | { |
272e2315 | 881 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
882 | int ret; |
883 | ||
884 | /* do we need to apply the constraint voltage */ | |
885 | if (rdev->constraints->apply_uV && | |
fa93fd4e MB |
886 | rdev->constraints->min_uV && rdev->constraints->max_uV) { |
887 | int target_min, target_max; | |
064d5cd1 AB |
888 | int current_uV = _regulator_get_voltage(rdev); |
889 | if (current_uV < 0) { | |
69d58839 NM |
890 | rdev_err(rdev, |
891 | "failed to get the current voltage(%d)\n", | |
892 | current_uV); | |
064d5cd1 AB |
893 | return current_uV; |
894 | } | |
fa93fd4e MB |
895 | |
896 | /* | |
897 | * If we're below the minimum voltage move up to the | |
898 | * minimum voltage, if we're above the maximum voltage | |
899 | * then move down to the maximum. | |
900 | */ | |
901 | target_min = current_uV; | |
902 | target_max = current_uV; | |
903 | ||
904 | if (current_uV < rdev->constraints->min_uV) { | |
905 | target_min = rdev->constraints->min_uV; | |
906 | target_max = rdev->constraints->min_uV; | |
907 | } | |
908 | ||
909 | if (current_uV > rdev->constraints->max_uV) { | |
910 | target_min = rdev->constraints->max_uV; | |
911 | target_max = rdev->constraints->max_uV; | |
912 | } | |
913 | ||
914 | if (target_min != current_uV || target_max != current_uV) { | |
45a91e8f MB |
915 | rdev_info(rdev, "Bringing %duV into %d-%duV\n", |
916 | current_uV, target_min, target_max); | |
064d5cd1 | 917 | ret = _regulator_do_set_voltage( |
fa93fd4e | 918 | rdev, target_min, target_max); |
064d5cd1 AB |
919 | if (ret < 0) { |
920 | rdev_err(rdev, | |
fa93fd4e MB |
921 | "failed to apply %d-%duV constraint(%d)\n", |
922 | target_min, target_max, ret); | |
064d5cd1 AB |
923 | return ret; |
924 | } | |
75790251 | 925 | } |
af5866c9 | 926 | } |
e06f5b4f | 927 | |
4367cfdc DB |
928 | /* constrain machine-level voltage specs to fit |
929 | * the actual range supported by this regulator. | |
930 | */ | |
931 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
932 | int count = rdev->desc->n_voltages; | |
933 | int i; | |
934 | int min_uV = INT_MAX; | |
935 | int max_uV = INT_MIN; | |
936 | int cmin = constraints->min_uV; | |
937 | int cmax = constraints->max_uV; | |
938 | ||
3e590918 MB |
939 | /* it's safe to autoconfigure fixed-voltage supplies |
940 | and the constraints are used by list_voltage. */ | |
4367cfdc | 941 | if (count == 1 && !cmin) { |
3e590918 | 942 | cmin = 1; |
4367cfdc | 943 | cmax = INT_MAX; |
3e590918 MB |
944 | constraints->min_uV = cmin; |
945 | constraints->max_uV = cmax; | |
4367cfdc DB |
946 | } |
947 | ||
3e2b9abd MB |
948 | /* voltage constraints are optional */ |
949 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 950 | return 0; |
3e2b9abd | 951 | |
4367cfdc | 952 | /* else require explicit machine-level constraints */ |
3e2b9abd | 953 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 954 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 955 | return -EINVAL; |
4367cfdc DB |
956 | } |
957 | ||
958 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
959 | for (i = 0; i < count; i++) { | |
960 | int value; | |
961 | ||
962 | value = ops->list_voltage(rdev, i); | |
963 | if (value <= 0) | |
964 | continue; | |
965 | ||
966 | /* maybe adjust [min_uV..max_uV] */ | |
967 | if (value >= cmin && value < min_uV) | |
968 | min_uV = value; | |
969 | if (value <= cmax && value > max_uV) | |
970 | max_uV = value; | |
971 | } | |
972 | ||
973 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
974 | if (max_uV < min_uV) { | |
fff15bef MB |
975 | rdev_err(rdev, |
976 | "unsupportable voltage constraints %u-%uuV\n", | |
977 | min_uV, max_uV); | |
e79055d6 | 978 | return -EINVAL; |
4367cfdc DB |
979 | } |
980 | ||
981 | /* use regulator's subset of machine constraints */ | |
982 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
983 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
984 | constraints->min_uV, min_uV); | |
4367cfdc DB |
985 | constraints->min_uV = min_uV; |
986 | } | |
987 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
988 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
989 | constraints->max_uV, max_uV); | |
4367cfdc DB |
990 | constraints->max_uV = max_uV; |
991 | } | |
992 | } | |
993 | ||
e79055d6 MB |
994 | return 0; |
995 | } | |
996 | ||
f8c1700d LD |
997 | static int machine_constraints_current(struct regulator_dev *rdev, |
998 | struct regulation_constraints *constraints) | |
999 | { | |
272e2315 | 1000 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
1001 | int ret; |
1002 | ||
1003 | if (!constraints->min_uA && !constraints->max_uA) | |
1004 | return 0; | |
1005 | ||
1006 | if (constraints->min_uA > constraints->max_uA) { | |
1007 | rdev_err(rdev, "Invalid current constraints\n"); | |
1008 | return -EINVAL; | |
1009 | } | |
1010 | ||
1011 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
1012 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | /* Set regulator current in constraints range */ | |
1017 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
1018 | constraints->max_uA); | |
1019 | if (ret < 0) { | |
1020 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
30c21971 MP |
1027 | static int _regulator_do_enable(struct regulator_dev *rdev); |
1028 | ||
e79055d6 MB |
1029 | /** |
1030 | * set_machine_constraints - sets regulator constraints | |
1031 | * @rdev: regulator source | |
1032 | * @constraints: constraints to apply | |
1033 | * | |
1034 | * Allows platform initialisation code to define and constrain | |
1035 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
1036 | * Constraints *must* be set by platform code in order for some | |
1037 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1038 | * set_mode. | |
1039 | */ | |
1040 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1041 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1042 | { |
1043 | int ret = 0; | |
272e2315 | 1044 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1045 | |
9a8f5e07 MB |
1046 | if (constraints) |
1047 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1048 | GFP_KERNEL); | |
1049 | else | |
1050 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1051 | GFP_KERNEL); | |
f8c12fe3 MB |
1052 | if (!rdev->constraints) |
1053 | return -ENOMEM; | |
af5866c9 | 1054 | |
f8c12fe3 | 1055 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 | 1056 | if (ret != 0) |
6333ef46 | 1057 | return ret; |
e79055d6 | 1058 | |
f8c1700d | 1059 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 | 1060 | if (ret != 0) |
6333ef46 | 1061 | return ret; |
e79055d6 | 1062 | |
36e4f839 SB |
1063 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1064 | ret = ops->set_input_current_limit(rdev, | |
1065 | rdev->constraints->ilim_uA); | |
1066 | if (ret < 0) { | |
1067 | rdev_err(rdev, "failed to set input limit\n"); | |
6333ef46 | 1068 | return ret; |
36e4f839 SB |
1069 | } |
1070 | } | |
1071 | ||
a5766f11 | 1072 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1073 | if (rdev->constraints->initial_state) { |
f7efad10 | 1074 | ret = suspend_set_state(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1075 | if (ret < 0) { |
5da84fd9 | 1076 | rdev_err(rdev, "failed to set suspend state\n"); |
6333ef46 | 1077 | return ret; |
e06f5b4f MB |
1078 | } |
1079 | } | |
a5766f11 | 1080 | |
9a8f5e07 | 1081 | if (rdev->constraints->initial_mode) { |
a308466c | 1082 | if (!ops->set_mode) { |
5da84fd9 | 1083 | rdev_err(rdev, "no set_mode operation\n"); |
6333ef46 | 1084 | return -EINVAL; |
a308466c MB |
1085 | } |
1086 | ||
f8c12fe3 | 1087 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1088 | if (ret < 0) { |
5da84fd9 | 1089 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
6333ef46 | 1090 | return ret; |
a308466c MB |
1091 | } |
1092 | } | |
1093 | ||
cacf90f2 MB |
1094 | /* If the constraints say the regulator should be on at this point |
1095 | * and we have control then make sure it is enabled. | |
1096 | */ | |
30c21971 MP |
1097 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1098 | ret = _regulator_do_enable(rdev); | |
1099 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1100 | rdev_err(rdev, "failed to enable\n"); |
6333ef46 | 1101 | return ret; |
e5fda26c MB |
1102 | } |
1103 | } | |
1104 | ||
1653ccf4 YSB |
1105 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1106 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1107 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1108 | if (ret < 0) { | |
1109 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
6333ef46 | 1110 | return ret; |
6f0b2c69 YSB |
1111 | } |
1112 | } | |
1113 | ||
23c779b9 SB |
1114 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1115 | ret = ops->set_pull_down(rdev); | |
1116 | if (ret < 0) { | |
1117 | rdev_err(rdev, "failed to set pull down\n"); | |
6333ef46 | 1118 | return ret; |
23c779b9 SB |
1119 | } |
1120 | } | |
1121 | ||
57f66b78 SB |
1122 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1123 | ret = ops->set_soft_start(rdev); | |
1124 | if (ret < 0) { | |
1125 | rdev_err(rdev, "failed to set soft start\n"); | |
6333ef46 | 1126 | return ret; |
57f66b78 SB |
1127 | } |
1128 | } | |
1129 | ||
3a003bae SB |
1130 | if (rdev->constraints->over_current_protection |
1131 | && ops->set_over_current_protection) { | |
1132 | ret = ops->set_over_current_protection(rdev); | |
1133 | if (ret < 0) { | |
1134 | rdev_err(rdev, "failed to set over current protection\n"); | |
6333ef46 | 1135 | return ret; |
3a003bae SB |
1136 | } |
1137 | } | |
1138 | ||
670666b9 LD |
1139 | if (rdev->constraints->active_discharge && ops->set_active_discharge) { |
1140 | bool ad_state = (rdev->constraints->active_discharge == | |
1141 | REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; | |
1142 | ||
1143 | ret = ops->set_active_discharge(rdev, ad_state); | |
1144 | if (ret < 0) { | |
1145 | rdev_err(rdev, "failed to set active discharge\n"); | |
1146 | return ret; | |
1147 | } | |
1148 | } | |
1149 | ||
a5766f11 | 1150 | print_constraints(rdev); |
1a6958e7 | 1151 | return 0; |
a5766f11 LG |
1152 | } |
1153 | ||
1154 | /** | |
1155 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1156 | * @rdev: regulator name |
1157 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1158 | * |
1159 | * Called by platform initialisation code to set the supply regulator for this | |
1160 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1161 | * core if it's child is enabled. | |
1162 | */ | |
1163 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1164 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1165 | { |
1166 | int err; | |
1167 | ||
3801b86a MB |
1168 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1169 | ||
e2c09ae7 JMC |
1170 | if (!try_module_get(supply_rdev->owner)) |
1171 | return -ENODEV; | |
1172 | ||
3801b86a | 1173 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1174 | if (rdev->supply == NULL) { |
1175 | err = -ENOMEM; | |
3801b86a | 1176 | return err; |
a5766f11 | 1177 | } |
57ad526a | 1178 | supply_rdev->open_count++; |
3801b86a MB |
1179 | |
1180 | return 0; | |
a5766f11 LG |
1181 | } |
1182 | ||
1183 | /** | |
06c63f93 | 1184 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1185 | * @rdev: regulator source |
40f9244f | 1186 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1187 | * @supply: symbolic name for supply |
a5766f11 LG |
1188 | * |
1189 | * Allows platform initialisation code to map physical regulator | |
1190 | * sources to symbolic names for supplies for use by devices. Devices | |
1191 | * should use these symbolic names to request regulators, avoiding the | |
1192 | * need to provide board-specific regulator names as platform data. | |
1193 | */ | |
1194 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1195 | const char *consumer_dev_name, |
1196 | const char *supply) | |
a5766f11 LG |
1197 | { |
1198 | struct regulator_map *node; | |
9ed2099e | 1199 | int has_dev; |
a5766f11 LG |
1200 | |
1201 | if (supply == NULL) | |
1202 | return -EINVAL; | |
1203 | ||
9ed2099e MB |
1204 | if (consumer_dev_name != NULL) |
1205 | has_dev = 1; | |
1206 | else | |
1207 | has_dev = 0; | |
1208 | ||
6001e13c | 1209 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1210 | if (node->dev_name && consumer_dev_name) { |
1211 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1212 | continue; | |
1213 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1214 | continue; |
23b5cc2a JN |
1215 | } |
1216 | ||
6001e13c DB |
1217 | if (strcmp(node->supply, supply) != 0) |
1218 | continue; | |
1219 | ||
737f360d MB |
1220 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1221 | consumer_dev_name, | |
1222 | dev_name(&node->regulator->dev), | |
1223 | node->regulator->desc->name, | |
1224 | supply, | |
1225 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1226 | return -EBUSY; |
1227 | } | |
1228 | ||
9ed2099e | 1229 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1230 | if (node == NULL) |
1231 | return -ENOMEM; | |
1232 | ||
1233 | node->regulator = rdev; | |
a5766f11 LG |
1234 | node->supply = supply; |
1235 | ||
9ed2099e MB |
1236 | if (has_dev) { |
1237 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1238 | if (node->dev_name == NULL) { | |
1239 | kfree(node); | |
1240 | return -ENOMEM; | |
1241 | } | |
40f9244f MB |
1242 | } |
1243 | ||
a5766f11 LG |
1244 | list_add(&node->list, ®ulator_map_list); |
1245 | return 0; | |
1246 | } | |
1247 | ||
0f1d747b MR |
1248 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1249 | { | |
1250 | struct regulator_map *node, *n; | |
1251 | ||
1252 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1253 | if (rdev == node->regulator) { | |
1254 | list_del(&node->list); | |
40f9244f | 1255 | kfree(node->dev_name); |
0f1d747b | 1256 | kfree(node); |
0f1d747b MR |
1257 | } |
1258 | } | |
1259 | } | |
1260 | ||
2d80a91b RF |
1261 | #ifdef CONFIG_DEBUG_FS |
1262 | static ssize_t constraint_flags_read_file(struct file *file, | |
1263 | char __user *user_buf, | |
1264 | size_t count, loff_t *ppos) | |
1265 | { | |
1266 | const struct regulator *regulator = file->private_data; | |
1267 | const struct regulation_constraints *c = regulator->rdev->constraints; | |
1268 | char *buf; | |
1269 | ssize_t ret; | |
1270 | ||
1271 | if (!c) | |
1272 | return 0; | |
1273 | ||
1274 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1275 | if (!buf) | |
1276 | return -ENOMEM; | |
1277 | ||
1278 | ret = snprintf(buf, PAGE_SIZE, | |
1279 | "always_on: %u\n" | |
1280 | "boot_on: %u\n" | |
1281 | "apply_uV: %u\n" | |
1282 | "ramp_disable: %u\n" | |
1283 | "soft_start: %u\n" | |
1284 | "pull_down: %u\n" | |
1285 | "over_current_protection: %u\n", | |
1286 | c->always_on, | |
1287 | c->boot_on, | |
1288 | c->apply_uV, | |
1289 | c->ramp_disable, | |
1290 | c->soft_start, | |
1291 | c->pull_down, | |
1292 | c->over_current_protection); | |
1293 | ||
1294 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
1295 | kfree(buf); | |
1296 | ||
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | #endif | |
1301 | ||
1302 | static const struct file_operations constraint_flags_fops = { | |
1303 | #ifdef CONFIG_DEBUG_FS | |
1304 | .open = simple_open, | |
1305 | .read = constraint_flags_read_file, | |
1306 | .llseek = default_llseek, | |
1307 | #endif | |
1308 | }; | |
1309 | ||
f5726ae3 | 1310 | #define REG_STR_SIZE 64 |
414c70cb LG |
1311 | |
1312 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1313 | struct device *dev, | |
1314 | const char *supply_name) | |
1315 | { | |
1316 | struct regulator *regulator; | |
1317 | char buf[REG_STR_SIZE]; | |
1318 | int err, size; | |
1319 | ||
1320 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1321 | if (regulator == NULL) | |
1322 | return NULL; | |
1323 | ||
1324 | mutex_lock(&rdev->mutex); | |
1325 | regulator->rdev = rdev; | |
1326 | list_add(®ulator->list, &rdev->consumer_list); | |
1327 | ||
1328 | if (dev) { | |
e2c98eaf SG |
1329 | regulator->dev = dev; |
1330 | ||
222cc7b1 | 1331 | /* Add a link to the device sysfs entry */ |
b7cd1b13 BG |
1332 | size = snprintf(buf, REG_STR_SIZE, "%s-%s", |
1333 | dev->kobj.name, supply_name); | |
414c70cb | 1334 | if (size >= REG_STR_SIZE) |
222cc7b1 | 1335 | goto overflow_err; |
414c70cb LG |
1336 | |
1337 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1338 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1339 | goto overflow_err; |
414c70cb | 1340 | |
ff268b56 | 1341 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1342 | buf); |
1343 | if (err) { | |
ff268b56 | 1344 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1345 | dev->kobj.name, err); |
222cc7b1 | 1346 | /* non-fatal */ |
414c70cb | 1347 | } |
5de70519 | 1348 | } else { |
0630b614 | 1349 | regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL); |
5de70519 | 1350 | if (regulator->supply_name == NULL) |
222cc7b1 | 1351 | goto overflow_err; |
5de70519 MB |
1352 | } |
1353 | ||
5de70519 MB |
1354 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1355 | rdev->debugfs); | |
24751434 | 1356 | if (!regulator->debugfs) { |
ad3a942b | 1357 | rdev_dbg(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1358 | } else { |
1359 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1360 | ®ulator->uA_load); | |
1361 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
c360a6df | 1362 | ®ulator->voltage[PM_SUSPEND_ON].min_uV); |
5de70519 | 1363 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, |
c360a6df | 1364 | ®ulator->voltage[PM_SUSPEND_ON].max_uV); |
2d80a91b RF |
1365 | debugfs_create_file("constraint_flags", 0444, |
1366 | regulator->debugfs, regulator, | |
1367 | &constraint_flags_fops); | |
414c70cb | 1368 | } |
5de70519 | 1369 | |
6492bc1b MB |
1370 | /* |
1371 | * Check now if the regulator is an always on regulator - if | |
1372 | * it is then we don't need to do nearly so much work for | |
1373 | * enable/disable calls. | |
1374 | */ | |
8a34e979 | 1375 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) && |
6492bc1b MB |
1376 | _regulator_is_enabled(rdev)) |
1377 | regulator->always_on = true; | |
1378 | ||
414c70cb LG |
1379 | mutex_unlock(&rdev->mutex); |
1380 | return regulator; | |
414c70cb LG |
1381 | overflow_err: |
1382 | list_del(®ulator->list); | |
1383 | kfree(regulator); | |
1384 | mutex_unlock(&rdev->mutex); | |
1385 | return NULL; | |
1386 | } | |
1387 | ||
31aae2be MB |
1388 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1389 | { | |
00c877c6 LD |
1390 | if (rdev->constraints && rdev->constraints->enable_time) |
1391 | return rdev->constraints->enable_time; | |
31aae2be | 1392 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1393 | return rdev->desc->enable_time; |
31aae2be MB |
1394 | return rdev->desc->ops->enable_time(rdev); |
1395 | } | |
1396 | ||
a06ccd9c CK |
1397 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1398 | struct device *dev, const char *supply) | |
1399 | { | |
1400 | struct regulator_supply_alias *map; | |
1401 | ||
1402 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1403 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1404 | return map; | |
1405 | ||
1406 | return NULL; | |
1407 | } | |
1408 | ||
1409 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1410 | { | |
1411 | struct regulator_supply_alias *map; | |
1412 | ||
1413 | map = regulator_find_supply_alias(*dev, *supply); | |
1414 | if (map) { | |
1415 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1416 | *supply, map->alias_supply, | |
1417 | dev_name(map->alias_dev)); | |
1418 | *dev = map->alias_dev; | |
1419 | *supply = map->alias_supply; | |
1420 | } | |
1421 | } | |
1422 | ||
85f3b431 TV |
1423 | static int regulator_match(struct device *dev, const void *data) |
1424 | { | |
1425 | struct regulator_dev *r = dev_to_rdev(dev); | |
1426 | ||
1427 | return strcmp(rdev_get_name(r), data) == 0; | |
1428 | } | |
1429 | ||
1430 | static struct regulator_dev *regulator_lookup_by_name(const char *name) | |
1431 | { | |
1432 | struct device *dev; | |
1433 | ||
1434 | dev = class_find_device(®ulator_class, NULL, name, regulator_match); | |
1435 | ||
1436 | return dev ? dev_to_rdev(dev) : NULL; | |
1437 | } | |
1438 | ||
1439 | /** | |
1440 | * regulator_dev_lookup - lookup a regulator device. | |
1441 | * @dev: device for regulator "consumer". | |
1442 | * @supply: Supply name or regulator ID. | |
85f3b431 TV |
1443 | * |
1444 | * If successful, returns a struct regulator_dev that corresponds to the name | |
163478da DT |
1445 | * @supply and with the embedded struct device refcount incremented by one. |
1446 | * The refcount must be dropped by calling put_device(). | |
1447 | * On failure one of the following ERR-PTR-encoded values is returned: | |
1448 | * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed | |
1449 | * in the future. | |
85f3b431 | 1450 | */ |
69511a45 | 1451 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
163478da | 1452 | const char *supply) |
69511a45 | 1453 | { |
06217197 | 1454 | struct regulator_dev *r = NULL; |
69511a45 | 1455 | struct device_node *node; |
576ca436 MB |
1456 | struct regulator_map *map; |
1457 | const char *devname = NULL; | |
69511a45 | 1458 | |
a06ccd9c CK |
1459 | regulator_supply_alias(&dev, &supply); |
1460 | ||
69511a45 RN |
1461 | /* first do a dt based lookup */ |
1462 | if (dev && dev->of_node) { | |
1463 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1464 | if (node) { |
85f3b431 TV |
1465 | r = of_find_regulator_by_node(node); |
1466 | if (r) | |
1467 | return r; | |
163478da | 1468 | |
6d191a5f | 1469 | /* |
163478da DT |
1470 | * We have a node, but there is no device. |
1471 | * assume it has not registered yet. | |
6d191a5f | 1472 | */ |
163478da | 1473 | return ERR_PTR(-EPROBE_DEFER); |
6d191a5f | 1474 | } |
69511a45 RN |
1475 | } |
1476 | ||
1477 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1478 | if (dev) |
1479 | devname = dev_name(dev); | |
1480 | ||
85f3b431 | 1481 | mutex_lock(®ulator_list_mutex); |
576ca436 MB |
1482 | list_for_each_entry(map, ®ulator_map_list, list) { |
1483 | /* If the mapping has a device set up it must match */ | |
1484 | if (map->dev_name && | |
1485 | (!devname || strcmp(map->dev_name, devname))) | |
1486 | continue; | |
1487 | ||
85f3b431 TV |
1488 | if (strcmp(map->supply, supply) == 0 && |
1489 | get_device(&map->regulator->dev)) { | |
163478da DT |
1490 | r = map->regulator; |
1491 | break; | |
85f3b431 | 1492 | } |
576ca436 | 1493 | } |
85f3b431 | 1494 | mutex_unlock(®ulator_list_mutex); |
576ca436 | 1495 | |
06217197 CK |
1496 | if (r) |
1497 | return r; | |
1498 | ||
1499 | r = regulator_lookup_by_name(supply); | |
163478da DT |
1500 | if (r) |
1501 | return r; | |
1502 | ||
1503 | return ERR_PTR(-ENODEV); | |
69511a45 RN |
1504 | } |
1505 | ||
6261b06d BA |
1506 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1507 | { | |
1508 | struct regulator_dev *r; | |
1509 | struct device *dev = rdev->dev.parent; | |
1510 | int ret; | |
1511 | ||
1512 | /* No supply to resovle? */ | |
1513 | if (!rdev->supply_name) | |
1514 | return 0; | |
1515 | ||
1516 | /* Supply already resolved? */ | |
1517 | if (rdev->supply) | |
1518 | return 0; | |
1519 | ||
163478da DT |
1520 | r = regulator_dev_lookup(dev, rdev->supply_name); |
1521 | if (IS_ERR(r)) { | |
1522 | ret = PTR_ERR(r); | |
1523 | ||
06423121 MB |
1524 | /* Did the lookup explicitly defer for us? */ |
1525 | if (ret == -EPROBE_DEFER) | |
1526 | return ret; | |
1527 | ||
9f7e25ed MB |
1528 | if (have_full_constraints()) { |
1529 | r = dummy_regulator_rdev; | |
85f3b431 | 1530 | get_device(&r->dev); |
9f7e25ed MB |
1531 | } else { |
1532 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1533 | rdev->supply_name, rdev->desc->name); | |
1534 | return -EPROBE_DEFER; | |
1535 | } | |
6261b06d BA |
1536 | } |
1537 | ||
66d228a2 JH |
1538 | /* |
1539 | * If the supply's parent device is not the same as the | |
1540 | * regulator's parent device, then ensure the parent device | |
1541 | * is bound before we resolve the supply, in case the parent | |
1542 | * device get probe deferred and unregisters the supply. | |
1543 | */ | |
1544 | if (r->dev.parent && r->dev.parent != rdev->dev.parent) { | |
1545 | if (!device_is_bound(r->dev.parent)) { | |
1546 | put_device(&r->dev); | |
1547 | return -EPROBE_DEFER; | |
1548 | } | |
1549 | } | |
1550 | ||
6261b06d BA |
1551 | /* Recursively resolve the supply of the supply */ |
1552 | ret = regulator_resolve_supply(r); | |
85f3b431 TV |
1553 | if (ret < 0) { |
1554 | put_device(&r->dev); | |
6261b06d | 1555 | return ret; |
85f3b431 | 1556 | } |
6261b06d BA |
1557 | |
1558 | ret = set_supply(rdev, r); | |
85f3b431 TV |
1559 | if (ret < 0) { |
1560 | put_device(&r->dev); | |
6261b06d | 1561 | return ret; |
85f3b431 | 1562 | } |
6261b06d BA |
1563 | |
1564 | /* Cascade always-on state to supply */ | |
95a293c7 | 1565 | if (_regulator_is_enabled(rdev)) { |
6261b06d | 1566 | ret = regulator_enable(rdev->supply); |
36a1f1b6 | 1567 | if (ret < 0) { |
9f8df6ad | 1568 | _regulator_put(rdev->supply); |
8e5356a7 | 1569 | rdev->supply = NULL; |
6261b06d | 1570 | return ret; |
36a1f1b6 | 1571 | } |
6261b06d BA |
1572 | } |
1573 | ||
1574 | return 0; | |
1575 | } | |
1576 | ||
5ffbd136 | 1577 | /* Internal regulator request function */ |
a8bd42a9 DT |
1578 | struct regulator *_regulator_get(struct device *dev, const char *id, |
1579 | enum regulator_get_type get_type) | |
414c70cb LG |
1580 | { |
1581 | struct regulator_dev *rdev; | |
7d245afa | 1582 | struct regulator *regulator; |
a4d7641f | 1583 | const char *devname = dev ? dev_name(dev) : "deviceless"; |
317b5684 | 1584 | int ret; |
414c70cb | 1585 | |
a8bd42a9 DT |
1586 | if (get_type >= MAX_GET_TYPE) { |
1587 | dev_err(dev, "invalid type %d in %s\n", get_type, __func__); | |
1588 | return ERR_PTR(-EINVAL); | |
1589 | } | |
1590 | ||
414c70cb | 1591 | if (id == NULL) { |
5da84fd9 | 1592 | pr_err("get() with no identifier\n"); |
043c998f | 1593 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1594 | } |
1595 | ||
163478da | 1596 | rdev = regulator_dev_lookup(dev, id); |
a4d7641f DT |
1597 | if (IS_ERR(rdev)) { |
1598 | ret = PTR_ERR(rdev); | |
1e4b545c | 1599 | |
a4d7641f DT |
1600 | /* |
1601 | * If regulator_dev_lookup() fails with error other | |
1602 | * than -ENODEV our job here is done, we simply return it. | |
1603 | */ | |
1604 | if (ret != -ENODEV) | |
1605 | return ERR_PTR(ret); | |
34abbd68 | 1606 | |
a4d7641f DT |
1607 | if (!have_full_constraints()) { |
1608 | dev_warn(dev, | |
1609 | "incomplete constraints, dummy supplies not allowed\n"); | |
1610 | return ERR_PTR(-ENODEV); | |
1611 | } | |
4ddfebd3 | 1612 | |
a4d7641f DT |
1613 | switch (get_type) { |
1614 | case NORMAL_GET: | |
1615 | /* | |
1616 | * Assume that a regulator is physically present and | |
1617 | * enabled, even if it isn't hooked up, and just | |
1618 | * provide a dummy. | |
1619 | */ | |
1620 | dev_warn(dev, | |
1621 | "%s supply %s not found, using dummy regulator\n", | |
1622 | devname, id); | |
1623 | rdev = dummy_regulator_rdev; | |
1624 | get_device(&rdev->dev); | |
1625 | break; | |
34abbd68 | 1626 | |
a4d7641f DT |
1627 | case EXCLUSIVE_GET: |
1628 | dev_warn(dev, | |
1629 | "dummy supplies not allowed for exclusive requests\n"); | |
1630 | /* fall through */ | |
34abbd68 | 1631 | |
a4d7641f DT |
1632 | default: |
1633 | return ERR_PTR(-ENODEV); | |
1634 | } | |
34abbd68 | 1635 | } |
34abbd68 | 1636 | |
5ffbd136 MB |
1637 | if (rdev->exclusive) { |
1638 | regulator = ERR_PTR(-EPERM); | |
85f3b431 TV |
1639 | put_device(&rdev->dev); |
1640 | return regulator; | |
5ffbd136 MB |
1641 | } |
1642 | ||
a8bd42a9 | 1643 | if (get_type == EXCLUSIVE_GET && rdev->open_count) { |
5ffbd136 | 1644 | regulator = ERR_PTR(-EBUSY); |
85f3b431 TV |
1645 | put_device(&rdev->dev); |
1646 | return regulator; | |
5ffbd136 MB |
1647 | } |
1648 | ||
6261b06d BA |
1649 | ret = regulator_resolve_supply(rdev); |
1650 | if (ret < 0) { | |
1651 | regulator = ERR_PTR(ret); | |
85f3b431 TV |
1652 | put_device(&rdev->dev); |
1653 | return regulator; | |
6261b06d BA |
1654 | } |
1655 | ||
85f3b431 | 1656 | if (!try_module_get(rdev->owner)) { |
7d245afa | 1657 | regulator = ERR_PTR(-EPROBE_DEFER); |
85f3b431 TV |
1658 | put_device(&rdev->dev); |
1659 | return regulator; | |
1660 | } | |
a5766f11 | 1661 | |
414c70cb LG |
1662 | regulator = create_regulator(rdev, dev, id); |
1663 | if (regulator == NULL) { | |
1664 | regulator = ERR_PTR(-ENOMEM); | |
85f3b431 | 1665 | put_device(&rdev->dev); |
414c70cb | 1666 | module_put(rdev->owner); |
85f3b431 | 1667 | return regulator; |
414c70cb LG |
1668 | } |
1669 | ||
5ffbd136 | 1670 | rdev->open_count++; |
a8bd42a9 | 1671 | if (get_type == EXCLUSIVE_GET) { |
5ffbd136 MB |
1672 | rdev->exclusive = 1; |
1673 | ||
1674 | ret = _regulator_is_enabled(rdev); | |
1675 | if (ret > 0) | |
1676 | rdev->use_count = 1; | |
1677 | else | |
1678 | rdev->use_count = 0; | |
1679 | } | |
1680 | ||
414c70cb LG |
1681 | return regulator; |
1682 | } | |
5ffbd136 MB |
1683 | |
1684 | /** | |
1685 | * regulator_get - lookup and obtain a reference to a regulator. | |
1686 | * @dev: device for regulator "consumer" | |
1687 | * @id: Supply name or regulator ID. | |
1688 | * | |
1689 | * Returns a struct regulator corresponding to the regulator producer, | |
1690 | * or IS_ERR() condition containing errno. | |
1691 | * | |
1692 | * Use of supply names configured via regulator_set_device_supply() is | |
1693 | * strongly encouraged. It is recommended that the supply name used | |
1694 | * should match the name used for the supply and/or the relevant | |
1695 | * device pins in the datasheet. | |
1696 | */ | |
1697 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1698 | { | |
a8bd42a9 | 1699 | return _regulator_get(dev, id, NORMAL_GET); |
5ffbd136 | 1700 | } |
414c70cb LG |
1701 | EXPORT_SYMBOL_GPL(regulator_get); |
1702 | ||
5ffbd136 MB |
1703 | /** |
1704 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1705 | * @dev: device for regulator "consumer" | |
1706 | * @id: Supply name or regulator ID. | |
1707 | * | |
1708 | * Returns a struct regulator corresponding to the regulator producer, | |
1709 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1710 | * unable to obtain this regulator while this reference is held and the |
1711 | * use count for the regulator will be initialised to reflect the current | |
1712 | * state of the regulator. | |
5ffbd136 MB |
1713 | * |
1714 | * This is intended for use by consumers which cannot tolerate shared | |
1715 | * use of the regulator such as those which need to force the | |
1716 | * regulator off for correct operation of the hardware they are | |
1717 | * controlling. | |
1718 | * | |
1719 | * Use of supply names configured via regulator_set_device_supply() is | |
1720 | * strongly encouraged. It is recommended that the supply name used | |
1721 | * should match the name used for the supply and/or the relevant | |
1722 | * device pins in the datasheet. | |
1723 | */ | |
1724 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1725 | { | |
a8bd42a9 | 1726 | return _regulator_get(dev, id, EXCLUSIVE_GET); |
5ffbd136 MB |
1727 | } |
1728 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1729 | ||
de1dd9fd MB |
1730 | /** |
1731 | * regulator_get_optional - obtain optional access to a regulator. | |
1732 | * @dev: device for regulator "consumer" | |
1733 | * @id: Supply name or regulator ID. | |
1734 | * | |
1735 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1736 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1737 | * |
1738 | * This is intended for use by consumers for devices which can have | |
1739 | * some supplies unconnected in normal use, such as some MMC devices. | |
1740 | * It can allow the regulator core to provide stub supplies for other | |
1741 | * supplies requested using normal regulator_get() calls without | |
1742 | * disrupting the operation of drivers that can handle absent | |
1743 | * supplies. | |
1744 | * | |
1745 | * Use of supply names configured via regulator_set_device_supply() is | |
1746 | * strongly encouraged. It is recommended that the supply name used | |
1747 | * should match the name used for the supply and/or the relevant | |
1748 | * device pins in the datasheet. | |
1749 | */ | |
1750 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1751 | { | |
a8bd42a9 | 1752 | return _regulator_get(dev, id, OPTIONAL_GET); |
de1dd9fd MB |
1753 | } |
1754 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1755 | ||
83b0302d | 1756 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1757 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1758 | { |
1759 | struct regulator_dev *rdev; | |
1760 | ||
93576842 | 1761 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
1762 | return; |
1763 | ||
70cfef26 KK |
1764 | lockdep_assert_held_once(®ulator_list_mutex); |
1765 | ||
414c70cb LG |
1766 | rdev = regulator->rdev; |
1767 | ||
5de70519 | 1768 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1769 | |
414c70cb | 1770 | /* remove any sysfs entries */ |
e2c98eaf | 1771 | if (regulator->dev) |
414c70cb | 1772 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1773 | mutex_lock(&rdev->mutex); |
414c70cb | 1774 | list_del(®ulator->list); |
414c70cb | 1775 | |
5ffbd136 MB |
1776 | rdev->open_count--; |
1777 | rdev->exclusive = 0; | |
85f3b431 | 1778 | put_device(&rdev->dev); |
83b0302d | 1779 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1780 | |
0630b614 | 1781 | kfree_const(regulator->supply_name); |
1768514e MB |
1782 | kfree(regulator); |
1783 | ||
414c70cb | 1784 | module_put(rdev->owner); |
23ff2f0f CK |
1785 | } |
1786 | ||
1787 | /** | |
1788 | * regulator_put - "free" the regulator source | |
1789 | * @regulator: regulator source | |
1790 | * | |
1791 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1792 | * regulator source are balanced by regulator_disable calls prior to calling | |
1793 | * this function. | |
1794 | */ | |
1795 | void regulator_put(struct regulator *regulator) | |
1796 | { | |
1797 | mutex_lock(®ulator_list_mutex); | |
1798 | _regulator_put(regulator); | |
414c70cb LG |
1799 | mutex_unlock(®ulator_list_mutex); |
1800 | } | |
1801 | EXPORT_SYMBOL_GPL(regulator_put); | |
1802 | ||
a06ccd9c CK |
1803 | /** |
1804 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1805 | * | |
1806 | * @dev: device that will be given as the regulator "consumer" | |
1807 | * @id: Supply name or regulator ID | |
1808 | * @alias_dev: device that should be used to lookup the supply | |
1809 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1810 | * supply | |
1811 | * | |
1812 | * All lookups for id on dev will instead be conducted for alias_id on | |
1813 | * alias_dev. | |
1814 | */ | |
1815 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1816 | struct device *alias_dev, | |
1817 | const char *alias_id) | |
1818 | { | |
1819 | struct regulator_supply_alias *map; | |
1820 | ||
1821 | map = regulator_find_supply_alias(dev, id); | |
1822 | if (map) | |
1823 | return -EEXIST; | |
1824 | ||
1825 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1826 | if (!map) | |
1827 | return -ENOMEM; | |
1828 | ||
1829 | map->src_dev = dev; | |
1830 | map->src_supply = id; | |
1831 | map->alias_dev = alias_dev; | |
1832 | map->alias_supply = alias_id; | |
1833 | ||
1834 | list_add(&map->list, ®ulator_supply_alias_list); | |
1835 | ||
1836 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1837 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1842 | ||
1843 | /** | |
1844 | * regulator_unregister_supply_alias - Remove device alias | |
1845 | * | |
1846 | * @dev: device that will be given as the regulator "consumer" | |
1847 | * @id: Supply name or regulator ID | |
1848 | * | |
1849 | * Remove a lookup alias if one exists for id on dev. | |
1850 | */ | |
1851 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1852 | { | |
1853 | struct regulator_supply_alias *map; | |
1854 | ||
1855 | map = regulator_find_supply_alias(dev, id); | |
1856 | if (map) { | |
1857 | list_del(&map->list); | |
1858 | kfree(map); | |
1859 | } | |
1860 | } | |
1861 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1862 | ||
1863 | /** | |
1864 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1865 | * | |
1866 | * @dev: device that will be given as the regulator "consumer" | |
1867 | * @id: List of supply names or regulator IDs | |
1868 | * @alias_dev: device that should be used to lookup the supply | |
1869 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1870 | * lookup the supply | |
1871 | * @num_id: Number of aliases to register | |
1872 | * | |
1873 | * @return 0 on success, an errno on failure. | |
1874 | * | |
1875 | * This helper function allows drivers to register several supply | |
1876 | * aliases in one operation. If any of the aliases cannot be | |
1877 | * registered any aliases that were registered will be removed | |
1878 | * before returning to the caller. | |
1879 | */ | |
9f8c0fe9 LJ |
1880 | int regulator_bulk_register_supply_alias(struct device *dev, |
1881 | const char *const *id, | |
a06ccd9c | 1882 | struct device *alias_dev, |
9f8c0fe9 | 1883 | const char *const *alias_id, |
a06ccd9c CK |
1884 | int num_id) |
1885 | { | |
1886 | int i; | |
1887 | int ret; | |
1888 | ||
1889 | for (i = 0; i < num_id; ++i) { | |
1890 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1891 | alias_id[i]); | |
1892 | if (ret < 0) | |
1893 | goto err; | |
1894 | } | |
1895 | ||
1896 | return 0; | |
1897 | ||
1898 | err: | |
1899 | dev_err(dev, | |
1900 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1901 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1902 | ||
1903 | while (--i >= 0) | |
1904 | regulator_unregister_supply_alias(dev, id[i]); | |
1905 | ||
1906 | return ret; | |
1907 | } | |
1908 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1909 | ||
1910 | /** | |
1911 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1912 | * | |
1913 | * @dev: device that will be given as the regulator "consumer" | |
1914 | * @id: List of supply names or regulator IDs | |
1915 | * @num_id: Number of aliases to unregister | |
1916 | * | |
1917 | * This helper function allows drivers to unregister several supply | |
1918 | * aliases in one operation. | |
1919 | */ | |
1920 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1921 | const char *const *id, |
a06ccd9c CK |
1922 | int num_id) |
1923 | { | |
1924 | int i; | |
1925 | ||
1926 | for (i = 0; i < num_id; ++i) | |
1927 | regulator_unregister_supply_alias(dev, id[i]); | |
1928 | } | |
1929 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1930 | ||
1931 | ||
f19b00da KM |
1932 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1933 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1934 | const struct regulator_config *config) | |
1935 | { | |
1936 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1937 | struct gpio_desc *gpiod; |
f19b00da KM |
1938 | int ret; |
1939 | ||
778b28b4 RK |
1940 | gpiod = gpio_to_desc(config->ena_gpio); |
1941 | ||
f19b00da | 1942 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1943 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1944 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1945 | config->ena_gpio); | |
1946 | goto update_ena_gpio_to_rdev; | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | ret = gpio_request_one(config->ena_gpio, | |
1951 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1952 | rdev_get_name(rdev)); | |
1953 | if (ret) | |
1954 | return ret; | |
1955 | ||
1956 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1957 | if (pin == NULL) { | |
1958 | gpio_free(config->ena_gpio); | |
1959 | return -ENOMEM; | |
1960 | } | |
1961 | ||
778b28b4 | 1962 | pin->gpiod = gpiod; |
f19b00da KM |
1963 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1964 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1965 | ||
1966 | update_ena_gpio_to_rdev: | |
1967 | pin->request_count++; | |
1968 | rdev->ena_pin = pin; | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1973 | { | |
1974 | struct regulator_enable_gpio *pin, *n; | |
1975 | ||
1976 | if (!rdev->ena_pin) | |
1977 | return; | |
1978 | ||
1979 | /* Free the GPIO only in case of no use */ | |
1980 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1981 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1982 | if (pin->request_count <= 1) { |
1983 | pin->request_count = 0; | |
778b28b4 | 1984 | gpiod_put(pin->gpiod); |
f19b00da KM |
1985 | list_del(&pin->list); |
1986 | kfree(pin); | |
60a2362f SWK |
1987 | rdev->ena_pin = NULL; |
1988 | return; | |
f19b00da KM |
1989 | } else { |
1990 | pin->request_count--; | |
1991 | } | |
1992 | } | |
1993 | } | |
1994 | } | |
1995 | ||
967cfb18 | 1996 | /** |
31d6eebf RD |
1997 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1998 | * @rdev: regulator_dev structure | |
1999 | * @enable: enable GPIO at initial use? | |
2000 | * | |
967cfb18 KM |
2001 | * GPIO is enabled in case of initial use. (enable_count is 0) |
2002 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
2003 | */ | |
2004 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
2005 | { | |
2006 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
2007 | ||
2008 | if (!pin) | |
2009 | return -EINVAL; | |
2010 | ||
2011 | if (enable) { | |
2012 | /* Enable GPIO at initial use */ | |
2013 | if (pin->enable_count == 0) | |
778b28b4 RK |
2014 | gpiod_set_value_cansleep(pin->gpiod, |
2015 | !pin->ena_gpio_invert); | |
967cfb18 KM |
2016 | |
2017 | pin->enable_count++; | |
2018 | } else { | |
2019 | if (pin->enable_count > 1) { | |
2020 | pin->enable_count--; | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | /* Disable GPIO if not used */ | |
2025 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
2026 | gpiod_set_value_cansleep(pin->gpiod, |
2027 | pin->ena_gpio_invert); | |
967cfb18 KM |
2028 | pin->enable_count = 0; |
2029 | } | |
2030 | } | |
2031 | ||
2032 | return 0; | |
2033 | } | |
2034 | ||
79fd1141 GX |
2035 | /** |
2036 | * _regulator_enable_delay - a delay helper function | |
2037 | * @delay: time to delay in microseconds | |
2038 | * | |
2039 | * Delay for the requested amount of time as per the guidelines in: | |
2040 | * | |
2041 | * Documentation/timers/timers-howto.txt | |
2042 | * | |
2043 | * The assumption here is that regulators will never be enabled in | |
2044 | * atomic context and therefore sleeping functions can be used. | |
2045 | */ | |
2046 | static void _regulator_enable_delay(unsigned int delay) | |
2047 | { | |
2048 | unsigned int ms = delay / 1000; | |
2049 | unsigned int us = delay % 1000; | |
2050 | ||
2051 | if (ms > 0) { | |
2052 | /* | |
2053 | * For small enough values, handle super-millisecond | |
2054 | * delays in the usleep_range() call below. | |
2055 | */ | |
2056 | if (ms < 20) | |
2057 | us += ms * 1000; | |
2058 | else | |
2059 | msleep(ms); | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * Give the scheduler some room to coalesce with any other | |
2064 | * wakeup sources. For delays shorter than 10 us, don't even | |
2065 | * bother setting up high-resolution timers and just busy- | |
2066 | * loop. | |
2067 | */ | |
2068 | if (us >= 10) | |
2069 | usleep_range(us, us + 100); | |
2070 | else | |
2071 | udelay(us); | |
2072 | } | |
2073 | ||
5c5659d0 MB |
2074 | static int _regulator_do_enable(struct regulator_dev *rdev) |
2075 | { | |
2076 | int ret, delay; | |
2077 | ||
2078 | /* Query before enabling in case configuration dependent. */ | |
2079 | ret = _regulator_get_enable_time(rdev); | |
2080 | if (ret >= 0) { | |
2081 | delay = ret; | |
2082 | } else { | |
2083 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
2084 | delay = 0; | |
2085 | } | |
2086 | ||
2087 | trace_regulator_enable(rdev_get_name(rdev)); | |
2088 | ||
871f5650 GX |
2089 | if (rdev->desc->off_on_delay) { |
2090 | /* if needed, keep a distance of off_on_delay from last time | |
2091 | * this regulator was disabled. | |
2092 | */ | |
2093 | unsigned long start_jiffy = jiffies; | |
2094 | unsigned long intended, max_delay, remaining; | |
2095 | ||
2096 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
2097 | intended = rdev->last_off_jiffy + max_delay; | |
2098 | ||
2099 | if (time_before(start_jiffy, intended)) { | |
2100 | /* calc remaining jiffies to deal with one-time | |
2101 | * timer wrapping. | |
2102 | * in case of multiple timer wrapping, either it can be | |
2103 | * detected by out-of-range remaining, or it cannot be | |
2104 | * detected and we gets a panelty of | |
2105 | * _regulator_enable_delay(). | |
2106 | */ | |
2107 | remaining = intended - start_jiffy; | |
2108 | if (remaining <= max_delay) | |
2109 | _regulator_enable_delay( | |
2110 | jiffies_to_usecs(remaining)); | |
2111 | } | |
2112 | } | |
2113 | ||
967cfb18 | 2114 | if (rdev->ena_pin) { |
29d62ec5 DA |
2115 | if (!rdev->ena_gpio_state) { |
2116 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
2117 | if (ret < 0) | |
2118 | return ret; | |
2119 | rdev->ena_gpio_state = 1; | |
2120 | } | |
65f73508 | 2121 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
2122 | ret = rdev->desc->ops->enable(rdev); |
2123 | if (ret < 0) | |
2124 | return ret; | |
2125 | } else { | |
2126 | return -EINVAL; | |
2127 | } | |
2128 | ||
2129 | /* Allow the regulator to ramp; it would be useful to extend | |
2130 | * this for bulk operations so that the regulators can ramp | |
2131 | * together. */ | |
2132 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
2133 | ||
79fd1141 | 2134 | _regulator_enable_delay(delay); |
5c5659d0 MB |
2135 | |
2136 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
414c70cb LG |
2141 | /* locks held by regulator_enable() */ |
2142 | static int _regulator_enable(struct regulator_dev *rdev) | |
2143 | { | |
5c5659d0 | 2144 | int ret; |
414c70cb | 2145 | |
70cfef26 KK |
2146 | lockdep_assert_held_once(&rdev->mutex); |
2147 | ||
414c70cb | 2148 | /* check voltage and requested load before enabling */ |
8a34e979 | 2149 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
9a2372fa | 2150 | drms_uA_update(rdev); |
414c70cb | 2151 | |
9a2372fa MB |
2152 | if (rdev->use_count == 0) { |
2153 | /* The regulator may on if it's not switchable or left on */ | |
2154 | ret = _regulator_is_enabled(rdev); | |
2155 | if (ret == -EINVAL || ret == 0) { | |
8a34e979 WP |
2156 | if (!regulator_ops_is_valid(rdev, |
2157 | REGULATOR_CHANGE_STATUS)) | |
9a2372fa MB |
2158 | return -EPERM; |
2159 | ||
5c5659d0 | 2160 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
2161 | if (ret < 0) |
2162 | return ret; | |
2163 | ||
264b88c9 HG |
2164 | _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE, |
2165 | NULL); | |
a7433cff | 2166 | } else if (ret < 0) { |
5da84fd9 | 2167 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
2168 | return ret; |
2169 | } | |
a7433cff | 2170 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2171 | } |
2172 | ||
9a2372fa MB |
2173 | rdev->use_count++; |
2174 | ||
2175 | return 0; | |
414c70cb LG |
2176 | } |
2177 | ||
2178 | /** | |
2179 | * regulator_enable - enable regulator output | |
2180 | * @regulator: regulator source | |
2181 | * | |
cf7bbcdf MB |
2182 | * Request that the regulator be enabled with the regulator output at |
2183 | * the predefined voltage or current value. Calls to regulator_enable() | |
2184 | * must be balanced with calls to regulator_disable(). | |
2185 | * | |
414c70cb | 2186 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2187 | * hardwired in the regulator. |
414c70cb LG |
2188 | */ |
2189 | int regulator_enable(struct regulator *regulator) | |
2190 | { | |
412aec61 DB |
2191 | struct regulator_dev *rdev = regulator->rdev; |
2192 | int ret = 0; | |
414c70cb | 2193 | |
6492bc1b MB |
2194 | if (regulator->always_on) |
2195 | return 0; | |
2196 | ||
3801b86a MB |
2197 | if (rdev->supply) { |
2198 | ret = regulator_enable(rdev->supply); | |
2199 | if (ret != 0) | |
2200 | return ret; | |
2201 | } | |
2202 | ||
412aec61 | 2203 | mutex_lock(&rdev->mutex); |
cd94b505 | 2204 | ret = _regulator_enable(rdev); |
412aec61 | 2205 | mutex_unlock(&rdev->mutex); |
3801b86a | 2206 | |
d1685e4e | 2207 | if (ret != 0 && rdev->supply) |
3801b86a MB |
2208 | regulator_disable(rdev->supply); |
2209 | ||
414c70cb LG |
2210 | return ret; |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2213 | ||
5c5659d0 MB |
2214 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2215 | { | |
2216 | int ret; | |
2217 | ||
2218 | trace_regulator_disable(rdev_get_name(rdev)); | |
2219 | ||
967cfb18 | 2220 | if (rdev->ena_pin) { |
29d62ec5 DA |
2221 | if (rdev->ena_gpio_state) { |
2222 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2223 | if (ret < 0) | |
2224 | return ret; | |
2225 | rdev->ena_gpio_state = 0; | |
2226 | } | |
5c5659d0 MB |
2227 | |
2228 | } else if (rdev->desc->ops->disable) { | |
2229 | ret = rdev->desc->ops->disable(rdev); | |
2230 | if (ret != 0) | |
2231 | return ret; | |
2232 | } | |
2233 | ||
871f5650 GX |
2234 | /* cares about last_off_jiffy only if off_on_delay is required by |
2235 | * device. | |
2236 | */ | |
2237 | if (rdev->desc->off_on_delay) | |
2238 | rdev->last_off_jiffy = jiffies; | |
2239 | ||
5c5659d0 MB |
2240 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2241 | ||
5c5659d0 MB |
2242 | return 0; |
2243 | } | |
2244 | ||
414c70cb | 2245 | /* locks held by regulator_disable() */ |
3801b86a | 2246 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2247 | { |
2248 | int ret = 0; | |
2249 | ||
70cfef26 KK |
2250 | lockdep_assert_held_once(&rdev->mutex); |
2251 | ||
cd94b505 | 2252 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2253 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2254 | return -EIO; |
2255 | ||
414c70cb | 2256 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2257 | if (rdev->use_count == 1 && |
2258 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2259 | |
2260 | /* we are last user */ | |
8a34e979 | 2261 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { |
a1c8a551 RF |
2262 | ret = _notifier_call_chain(rdev, |
2263 | REGULATOR_EVENT_PRE_DISABLE, | |
2264 | NULL); | |
2265 | if (ret & NOTIFY_STOP_MASK) | |
2266 | return -EINVAL; | |
2267 | ||
5c5659d0 | 2268 | ret = _regulator_do_disable(rdev); |
414c70cb | 2269 | if (ret < 0) { |
5da84fd9 | 2270 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2271 | _notifier_call_chain(rdev, |
2272 | REGULATOR_EVENT_ABORT_DISABLE, | |
2273 | NULL); | |
414c70cb LG |
2274 | return ret; |
2275 | } | |
66fda75f MP |
2276 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2277 | NULL); | |
414c70cb LG |
2278 | } |
2279 | ||
414c70cb LG |
2280 | rdev->use_count = 0; |
2281 | } else if (rdev->use_count > 1) { | |
8a34e979 | 2282 | if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) |
414c70cb LG |
2283 | drms_uA_update(rdev); |
2284 | ||
2285 | rdev->use_count--; | |
2286 | } | |
3801b86a | 2287 | |
414c70cb LG |
2288 | return ret; |
2289 | } | |
2290 | ||
2291 | /** | |
2292 | * regulator_disable - disable regulator output | |
2293 | * @regulator: regulator source | |
2294 | * | |
cf7bbcdf MB |
2295 | * Disable the regulator output voltage or current. Calls to |
2296 | * regulator_enable() must be balanced with calls to | |
2297 | * regulator_disable(). | |
69279fb9 | 2298 | * |
414c70cb | 2299 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2300 | * devices have it enabled, the regulator device supports disabling and |
2301 | * machine constraints permit this operation. | |
414c70cb LG |
2302 | */ |
2303 | int regulator_disable(struct regulator *regulator) | |
2304 | { | |
412aec61 DB |
2305 | struct regulator_dev *rdev = regulator->rdev; |
2306 | int ret = 0; | |
414c70cb | 2307 | |
6492bc1b MB |
2308 | if (regulator->always_on) |
2309 | return 0; | |
2310 | ||
412aec61 | 2311 | mutex_lock(&rdev->mutex); |
3801b86a | 2312 | ret = _regulator_disable(rdev); |
412aec61 | 2313 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2314 | |
3801b86a MB |
2315 | if (ret == 0 && rdev->supply) |
2316 | regulator_disable(rdev->supply); | |
8cbf811d | 2317 | |
414c70cb LG |
2318 | return ret; |
2319 | } | |
2320 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2321 | ||
2322 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2323 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2324 | { |
2325 | int ret = 0; | |
2326 | ||
70cfef26 KK |
2327 | lockdep_assert_held_once(&rdev->mutex); |
2328 | ||
a1c8a551 RF |
2329 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2330 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2331 | if (ret & NOTIFY_STOP_MASK) | |
2332 | return -EINVAL; | |
2333 | ||
66fda75f MP |
2334 | ret = _regulator_do_disable(rdev); |
2335 | if (ret < 0) { | |
2336 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2337 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2338 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2339 | return ret; |
414c70cb LG |
2340 | } |
2341 | ||
66fda75f MP |
2342 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2343 | REGULATOR_EVENT_DISABLE, NULL); | |
2344 | ||
2345 | return 0; | |
414c70cb LG |
2346 | } |
2347 | ||
2348 | /** | |
2349 | * regulator_force_disable - force disable regulator output | |
2350 | * @regulator: regulator source | |
2351 | * | |
2352 | * Forcibly disable the regulator output voltage or current. | |
2353 | * NOTE: this *will* disable the regulator output even if other consumer | |
2354 | * devices have it enabled. This should be used for situations when device | |
2355 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2356 | */ | |
2357 | int regulator_force_disable(struct regulator *regulator) | |
2358 | { | |
82d15839 | 2359 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2360 | int ret; |
2361 | ||
82d15839 | 2362 | mutex_lock(&rdev->mutex); |
414c70cb | 2363 | regulator->uA_load = 0; |
3801b86a | 2364 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2365 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2366 | |
3801b86a MB |
2367 | if (rdev->supply) |
2368 | while (rdev->open_count--) | |
2369 | regulator_disable(rdev->supply); | |
8cbf811d | 2370 | |
414c70cb LG |
2371 | return ret; |
2372 | } | |
2373 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2374 | ||
da07ecd9 MB |
2375 | static void regulator_disable_work(struct work_struct *work) |
2376 | { | |
2377 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2378 | disable_work.work); | |
2379 | int count, i, ret; | |
2380 | ||
2381 | mutex_lock(&rdev->mutex); | |
2382 | ||
2383 | BUG_ON(!rdev->deferred_disables); | |
2384 | ||
2385 | count = rdev->deferred_disables; | |
2386 | rdev->deferred_disables = 0; | |
2387 | ||
c9ccaa0c TR |
2388 | /* |
2389 | * Workqueue functions queue the new work instance while the previous | |
2390 | * work instance is being processed. Cancel the queued work instance | |
2391 | * as the work instance under processing does the job of the queued | |
2392 | * work instance. | |
2393 | */ | |
2394 | cancel_delayed_work(&rdev->disable_work); | |
2395 | ||
da07ecd9 MB |
2396 | for (i = 0; i < count; i++) { |
2397 | ret = _regulator_disable(rdev); | |
2398 | if (ret != 0) | |
2399 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2400 | } | |
2401 | ||
2402 | mutex_unlock(&rdev->mutex); | |
2403 | ||
2404 | if (rdev->supply) { | |
2405 | for (i = 0; i < count; i++) { | |
2406 | ret = regulator_disable(rdev->supply); | |
2407 | if (ret != 0) { | |
2408 | rdev_err(rdev, | |
2409 | "Supply disable failed: %d\n", ret); | |
2410 | } | |
2411 | } | |
2412 | } | |
2413 | } | |
2414 | ||
2415 | /** | |
2416 | * regulator_disable_deferred - disable regulator output with delay | |
2417 | * @regulator: regulator source | |
2418 | * @ms: miliseconds until the regulator is disabled | |
2419 | * | |
2420 | * Execute regulator_disable() on the regulator after a delay. This | |
2421 | * is intended for use with devices that require some time to quiesce. | |
2422 | * | |
2423 | * NOTE: this will only disable the regulator output if no other consumer | |
2424 | * devices have it enabled, the regulator device supports disabling and | |
2425 | * machine constraints permit this operation. | |
2426 | */ | |
2427 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2428 | { | |
2429 | struct regulator_dev *rdev = regulator->rdev; | |
2430 | ||
6492bc1b MB |
2431 | if (regulator->always_on) |
2432 | return 0; | |
2433 | ||
2b5a24a0 MB |
2434 | if (!ms) |
2435 | return regulator_disable(regulator); | |
2436 | ||
da07ecd9 MB |
2437 | mutex_lock(&rdev->mutex); |
2438 | rdev->deferred_disables++; | |
c9ccaa0c TR |
2439 | mod_delayed_work(system_power_efficient_wq, &rdev->disable_work, |
2440 | msecs_to_jiffies(ms)); | |
da07ecd9 MB |
2441 | mutex_unlock(&rdev->mutex); |
2442 | ||
70dc6daf | 2443 | return 0; |
da07ecd9 MB |
2444 | } |
2445 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2446 | ||
414c70cb LG |
2447 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2448 | { | |
65f73508 | 2449 | /* A GPIO control always takes precedence */ |
7b74d149 | 2450 | if (rdev->ena_pin) |
65f73508 MB |
2451 | return rdev->ena_gpio_state; |
2452 | ||
9a7f6a4c | 2453 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2454 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2455 | return 1; |
414c70cb | 2456 | |
9332546f | 2457 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2458 | } |
2459 | ||
3d67fe95 MP |
2460 | static int _regulator_list_voltage(struct regulator_dev *rdev, |
2461 | unsigned selector, int lock) | |
3a40cfc3 | 2462 | { |
3a40cfc3 SH |
2463 | const struct regulator_ops *ops = rdev->desc->ops; |
2464 | int ret; | |
2465 | ||
2466 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) | |
2467 | return rdev->desc->fixed_uV; | |
2468 | ||
2469 | if (ops->list_voltage) { | |
2470 | if (selector >= rdev->desc->n_voltages) | |
2471 | return -EINVAL; | |
2472 | if (lock) | |
2473 | mutex_lock(&rdev->mutex); | |
2474 | ret = ops->list_voltage(rdev, selector); | |
2475 | if (lock) | |
2476 | mutex_unlock(&rdev->mutex); | |
fd086045 | 2477 | } else if (rdev->is_switch && rdev->supply) { |
3d67fe95 MP |
2478 | ret = _regulator_list_voltage(rdev->supply->rdev, |
2479 | selector, lock); | |
3a40cfc3 SH |
2480 | } else { |
2481 | return -EINVAL; | |
2482 | } | |
2483 | ||
2484 | if (ret > 0) { | |
2485 | if (ret < rdev->constraints->min_uV) | |
2486 | ret = 0; | |
2487 | else if (ret > rdev->constraints->max_uV) | |
2488 | ret = 0; | |
2489 | } | |
2490 | ||
2491 | return ret; | |
2492 | } | |
2493 | ||
414c70cb LG |
2494 | /** |
2495 | * regulator_is_enabled - is the regulator output enabled | |
2496 | * @regulator: regulator source | |
2497 | * | |
412aec61 DB |
2498 | * Returns positive if the regulator driver backing the source/client |
2499 | * has requested that the device be enabled, zero if it hasn't, else a | |
2500 | * negative errno code. | |
2501 | * | |
2502 | * Note that the device backing this regulator handle can have multiple | |
2503 | * users, so it might be enabled even if regulator_enable() was never | |
2504 | * called for this particular source. | |
414c70cb LG |
2505 | */ |
2506 | int regulator_is_enabled(struct regulator *regulator) | |
2507 | { | |
9332546f MB |
2508 | int ret; |
2509 | ||
6492bc1b MB |
2510 | if (regulator->always_on) |
2511 | return 1; | |
2512 | ||
9332546f MB |
2513 | mutex_lock(®ulator->rdev->mutex); |
2514 | ret = _regulator_is_enabled(regulator->rdev); | |
2515 | mutex_unlock(®ulator->rdev->mutex); | |
2516 | ||
2517 | return ret; | |
414c70cb LG |
2518 | } |
2519 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2520 | ||
4367cfdc DB |
2521 | /** |
2522 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2523 | * @regulator: regulator source | |
2524 | * | |
2525 | * Returns number of selectors, or negative errno. Selectors are | |
2526 | * numbered starting at zero, and typically correspond to bitfields | |
2527 | * in hardware registers. | |
2528 | */ | |
2529 | int regulator_count_voltages(struct regulator *regulator) | |
2530 | { | |
2531 | struct regulator_dev *rdev = regulator->rdev; | |
2532 | ||
26988efe JMC |
2533 | if (rdev->desc->n_voltages) |
2534 | return rdev->desc->n_voltages; | |
2535 | ||
fd086045 | 2536 | if (!rdev->is_switch || !rdev->supply) |
26988efe JMC |
2537 | return -EINVAL; |
2538 | ||
2539 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2540 | } |
2541 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2542 | ||
2543 | /** | |
2544 | * regulator_list_voltage - enumerate supported voltages | |
2545 | * @regulator: regulator source | |
2546 | * @selector: identify voltage to list | |
2547 | * Context: can sleep | |
2548 | * | |
2549 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2550 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2551 | * negative errno. |
2552 | */ | |
2553 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2554 | { | |
3d67fe95 | 2555 | return _regulator_list_voltage(regulator->rdev, selector, 1); |
4367cfdc DB |
2556 | } |
2557 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2558 | ||
04eca28c TT |
2559 | /** |
2560 | * regulator_get_regmap - get the regulator's register map | |
2561 | * @regulator: regulator source | |
2562 | * | |
2563 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2564 | * if the regulator doesn't use regmap. | |
2565 | */ | |
2566 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2567 | { | |
2568 | struct regmap *map = regulator->rdev->regmap; | |
2569 | ||
2570 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2571 | } | |
2572 | ||
2573 | /** | |
2574 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2575 | * @regulator: regulator source | |
2576 | * @vsel_reg: voltage selector register, output parameter | |
2577 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2578 | * | |
2579 | * Returns the hardware register offset and bitmask used for setting the | |
2580 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2581 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2582 | * for example. | |
2583 | * | |
2584 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2585 | * and 0 is returned, otherwise a negative errno is returned. | |
2586 | */ | |
2587 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2588 | unsigned *vsel_reg, | |
2589 | unsigned *vsel_mask) | |
2590 | { | |
39f5460d GX |
2591 | struct regulator_dev *rdev = regulator->rdev; |
2592 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2593 | |
2594 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2595 | return -EOPNOTSUPP; | |
2596 | ||
0d5c8633 CIK |
2597 | *vsel_reg = rdev->desc->vsel_reg; |
2598 | *vsel_mask = rdev->desc->vsel_mask; | |
04eca28c TT |
2599 | |
2600 | return 0; | |
2601 | } | |
2602 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2603 | ||
2604 | /** | |
2605 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2606 | * @regulator: regulator source | |
2607 | * @selector: identify voltage to list | |
2608 | * | |
2609 | * Converts the selector to a hardware-specific voltage selector that can be | |
2610 | * directly written to the regulator registers. The address of the voltage | |
2611 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2612 | * | |
2613 | * On error a negative errno is returned. | |
2614 | */ | |
2615 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2616 | unsigned selector) | |
2617 | { | |
39f5460d GX |
2618 | struct regulator_dev *rdev = regulator->rdev; |
2619 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2620 | |
2621 | if (selector >= rdev->desc->n_voltages) | |
2622 | return -EINVAL; | |
2623 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2624 | return -EOPNOTSUPP; | |
2625 | ||
2626 | return selector; | |
2627 | } | |
2628 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2629 | ||
2a668a8b PW |
2630 | /** |
2631 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2632 | * @regulator: regulator source | |
2633 | * | |
2634 | * Returns the voltage step size between VSEL values for linear | |
2635 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2636 | */ | |
2637 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2638 | { | |
2639 | struct regulator_dev *rdev = regulator->rdev; | |
2640 | ||
2641 | return rdev->desc->uV_step; | |
2642 | } | |
2643 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2644 | ||
a7a1ad90 MB |
2645 | /** |
2646 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2647 | * | |
2648 | * @regulator: Regulator to check. | |
2649 | * @min_uV: Minimum required voltage in uV. | |
2650 | * @max_uV: Maximum required voltage in uV. | |
2651 | * | |
2652 | * Returns a boolean or a negative error code. | |
2653 | */ | |
2654 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2655 | int min_uV, int max_uV) | |
2656 | { | |
c5f3939b | 2657 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2658 | int i, voltages, ret; |
2659 | ||
c5f3939b | 2660 | /* If we can't change voltage check the current voltage */ |
8a34e979 | 2661 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c5f3939b MB |
2662 | ret = regulator_get_voltage(regulator); |
2663 | if (ret >= 0) | |
0d25d09d | 2664 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2665 | else |
2666 | return ret; | |
2667 | } | |
2668 | ||
bd7a2b60 PM |
2669 | /* Any voltage within constrains range is fine? */ |
2670 | if (rdev->desc->continuous_voltage_range) | |
2671 | return min_uV >= rdev->constraints->min_uV && | |
2672 | max_uV <= rdev->constraints->max_uV; | |
2673 | ||
a7a1ad90 MB |
2674 | ret = regulator_count_voltages(regulator); |
2675 | if (ret < 0) | |
2676 | return ret; | |
2677 | voltages = ret; | |
2678 | ||
2679 | for (i = 0; i < voltages; i++) { | |
2680 | ret = regulator_list_voltage(regulator, i); | |
2681 | ||
2682 | if (ret >= min_uV && ret <= max_uV) | |
2683 | return 1; | |
2684 | } | |
2685 | ||
2686 | return 0; | |
2687 | } | |
a398eaa2 | 2688 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2689 | |
a204f41e SH |
2690 | static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV, |
2691 | int max_uV) | |
2692 | { | |
2693 | const struct regulator_desc *desc = rdev->desc; | |
2694 | ||
2695 | if (desc->ops->map_voltage) | |
2696 | return desc->ops->map_voltage(rdev, min_uV, max_uV); | |
2697 | ||
2698 | if (desc->ops->list_voltage == regulator_list_voltage_linear) | |
2699 | return regulator_map_voltage_linear(rdev, min_uV, max_uV); | |
2700 | ||
2701 | if (desc->ops->list_voltage == regulator_list_voltage_linear_range) | |
2702 | return regulator_map_voltage_linear_range(rdev, min_uV, max_uV); | |
2703 | ||
2704 | return regulator_map_voltage_iterate(rdev, min_uV, max_uV); | |
2705 | } | |
2706 | ||
7179569a HS |
2707 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2708 | int min_uV, int max_uV, | |
2709 | unsigned *selector) | |
2710 | { | |
2711 | struct pre_voltage_change_data data; | |
2712 | int ret; | |
2713 | ||
2714 | data.old_uV = _regulator_get_voltage(rdev); | |
2715 | data.min_uV = min_uV; | |
2716 | data.max_uV = max_uV; | |
2717 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2718 | &data); | |
2719 | if (ret & NOTIFY_STOP_MASK) | |
2720 | return -EINVAL; | |
2721 | ||
2722 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2723 | if (ret >= 0) | |
2724 | return ret; | |
2725 | ||
2726 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2727 | (void *)data.old_uV); | |
2728 | ||
2729 | return ret; | |
2730 | } | |
2731 | ||
2732 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2733 | int uV, unsigned selector) | |
2734 | { | |
2735 | struct pre_voltage_change_data data; | |
2736 | int ret; | |
2737 | ||
2738 | data.old_uV = _regulator_get_voltage(rdev); | |
2739 | data.min_uV = uV; | |
2740 | data.max_uV = uV; | |
2741 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2742 | &data); | |
2743 | if (ret & NOTIFY_STOP_MASK) | |
2744 | return -EINVAL; | |
2745 | ||
2746 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2747 | if (ret >= 0) | |
2748 | return ret; | |
2749 | ||
2750 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2751 | (void *)data.old_uV); | |
2752 | ||
2753 | return ret; | |
2754 | } | |
2755 | ||
73e705bf MK |
2756 | static int _regulator_set_voltage_time(struct regulator_dev *rdev, |
2757 | int old_uV, int new_uV) | |
2758 | { | |
2759 | unsigned int ramp_delay = 0; | |
2760 | ||
2761 | if (rdev->constraints->ramp_delay) | |
2762 | ramp_delay = rdev->constraints->ramp_delay; | |
2763 | else if (rdev->desc->ramp_delay) | |
2764 | ramp_delay = rdev->desc->ramp_delay; | |
d6c1dc3f LD |
2765 | else if (rdev->constraints->settling_time) |
2766 | return rdev->constraints->settling_time; | |
3ffad468 MK |
2767 | else if (rdev->constraints->settling_time_up && |
2768 | (new_uV > old_uV)) | |
2769 | return rdev->constraints->settling_time_up; | |
2770 | else if (rdev->constraints->settling_time_down && | |
2771 | (new_uV < old_uV)) | |
2772 | return rdev->constraints->settling_time_down; | |
73e705bf MK |
2773 | |
2774 | if (ramp_delay == 0) { | |
ba14fa1a | 2775 | rdev_dbg(rdev, "ramp_delay not set\n"); |
73e705bf MK |
2776 | return 0; |
2777 | } | |
2778 | ||
2779 | return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); | |
2780 | } | |
2781 | ||
75790251 MB |
2782 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2783 | int min_uV, int max_uV) | |
2784 | { | |
2785 | int ret; | |
77af1b26 | 2786 | int delay = 0; |
e113d792 | 2787 | int best_val = 0; |
75790251 | 2788 | unsigned int selector; |
eba41a5e | 2789 | int old_selector = -1; |
57995a48 | 2790 | const struct regulator_ops *ops = rdev->desc->ops; |
73e705bf | 2791 | int old_uV = _regulator_get_voltage(rdev); |
75790251 MB |
2792 | |
2793 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2794 | ||
bf5892a8 MB |
2795 | min_uV += rdev->constraints->uV_offset; |
2796 | max_uV += rdev->constraints->uV_offset; | |
2797 | ||
eba41a5e AL |
2798 | /* |
2799 | * If we can't obtain the old selector there is not enough | |
2800 | * info to call set_voltage_time_sel(). | |
2801 | */ | |
8b7485ef | 2802 | if (_regulator_is_enabled(rdev) && |
57995a48 MK |
2803 | ops->set_voltage_time_sel && ops->get_voltage_sel) { |
2804 | old_selector = ops->get_voltage_sel(rdev); | |
eba41a5e AL |
2805 | if (old_selector < 0) |
2806 | return old_selector; | |
2807 | } | |
2808 | ||
57995a48 | 2809 | if (ops->set_voltage) { |
7179569a HS |
2810 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2811 | &selector); | |
e113d792 MB |
2812 | |
2813 | if (ret >= 0) { | |
57995a48 MK |
2814 | if (ops->list_voltage) |
2815 | best_val = ops->list_voltage(rdev, | |
2816 | selector); | |
e113d792 MB |
2817 | else |
2818 | best_val = _regulator_get_voltage(rdev); | |
2819 | } | |
2820 | ||
57995a48 | 2821 | } else if (ops->set_voltage_sel) { |
a204f41e | 2822 | ret = regulator_map_voltage(rdev, min_uV, max_uV); |
e843fc46 | 2823 | if (ret >= 0) { |
57995a48 | 2824 | best_val = ops->list_voltage(rdev, ret); |
e113d792 MB |
2825 | if (min_uV <= best_val && max_uV >= best_val) { |
2826 | selector = ret; | |
c66a566a AL |
2827 | if (old_selector == selector) |
2828 | ret = 0; | |
2829 | else | |
7179569a HS |
2830 | ret = _regulator_call_set_voltage_sel( |
2831 | rdev, best_val, selector); | |
e113d792 MB |
2832 | } else { |
2833 | ret = -EINVAL; | |
2834 | } | |
e8eef82b | 2835 | } |
75790251 MB |
2836 | } else { |
2837 | ret = -EINVAL; | |
2838 | } | |
e8eef82b | 2839 | |
31dfe686 MK |
2840 | if (ret) |
2841 | goto out; | |
77af1b26 | 2842 | |
73e705bf MK |
2843 | if (ops->set_voltage_time_sel) { |
2844 | /* | |
2845 | * Call set_voltage_time_sel if successfully obtained | |
2846 | * old_selector | |
2847 | */ | |
2848 | if (old_selector >= 0 && old_selector != selector) | |
2849 | delay = ops->set_voltage_time_sel(rdev, old_selector, | |
2850 | selector); | |
2851 | } else { | |
2852 | if (old_uV != best_val) { | |
2853 | if (ops->set_voltage_time) | |
2854 | delay = ops->set_voltage_time(rdev, old_uV, | |
2855 | best_val); | |
2856 | else | |
2857 | delay = _regulator_set_voltage_time(rdev, | |
2858 | old_uV, | |
2859 | best_val); | |
e8eef82b | 2860 | } |
73e705bf | 2861 | } |
75790251 | 2862 | |
73e705bf MK |
2863 | if (delay < 0) { |
2864 | rdev_warn(rdev, "failed to get delay: %d\n", delay); | |
2865 | delay = 0; | |
77af1b26 LW |
2866 | } |
2867 | ||
73e705bf MK |
2868 | /* Insert any necessary delays */ |
2869 | if (delay >= 1000) { | |
2870 | mdelay(delay / 1000); | |
2871 | udelay(delay % 1000); | |
2872 | } else if (delay) { | |
2873 | udelay(delay); | |
77af1b26 LW |
2874 | } |
2875 | ||
31dfe686 | 2876 | if (best_val >= 0) { |
2f6c797f AL |
2877 | unsigned long data = best_val; |
2878 | ||
ded06a52 | 2879 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2880 | (void *)data); |
2881 | } | |
ded06a52 | 2882 | |
31dfe686 | 2883 | out: |
eba41a5e | 2884 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2885 | |
2886 | return ret; | |
2887 | } | |
2888 | ||
f7efad10 CZ |
2889 | static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev, |
2890 | int min_uV, int max_uV, suspend_state_t state) | |
2891 | { | |
2892 | struct regulator_state *rstate; | |
2893 | int uV, sel; | |
2894 | ||
2895 | rstate = regulator_get_suspend_state(rdev, state); | |
2896 | if (rstate == NULL) | |
2897 | return -EINVAL; | |
2898 | ||
2899 | if (min_uV < rstate->min_uV) | |
2900 | min_uV = rstate->min_uV; | |
2901 | if (max_uV > rstate->max_uV) | |
2902 | max_uV = rstate->max_uV; | |
2903 | ||
2904 | sel = regulator_map_voltage(rdev, min_uV, max_uV); | |
2905 | if (sel < 0) | |
2906 | return sel; | |
2907 | ||
2908 | uV = rdev->desc->ops->list_voltage(rdev, sel); | |
2909 | if (uV >= min_uV && uV <= max_uV) | |
2910 | rstate->uV = uV; | |
2911 | ||
2912 | return 0; | |
2913 | } | |
2914 | ||
a9f226bc | 2915 | static int regulator_set_voltage_unlocked(struct regulator *regulator, |
c360a6df CZ |
2916 | int min_uV, int max_uV, |
2917 | suspend_state_t state) | |
414c70cb LG |
2918 | { |
2919 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 2920 | struct regulator_voltage *voltage = ®ulator->voltage[state]; |
95a3c23a | 2921 | int ret = 0; |
92d7a558 | 2922 | int old_min_uV, old_max_uV; |
c00dc359 | 2923 | int current_uV; |
fc42112c SH |
2924 | int best_supply_uV = 0; |
2925 | int supply_change_uV = 0; | |
414c70cb | 2926 | |
95a3c23a MB |
2927 | /* If we're setting the same range as last time the change |
2928 | * should be a noop (some cpufreq implementations use the same | |
2929 | * voltage for multiple frequencies, for example). | |
2930 | */ | |
c360a6df | 2931 | if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) |
95a3c23a MB |
2932 | goto out; |
2933 | ||
c00dc359 | 2934 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 2935 | * return successfully even though the regulator does not support |
c00dc359 BA |
2936 | * changing the voltage. |
2937 | */ | |
8a34e979 | 2938 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) { |
c00dc359 BA |
2939 | current_uV = _regulator_get_voltage(rdev); |
2940 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
c360a6df CZ |
2941 | voltage->min_uV = min_uV; |
2942 | voltage->max_uV = max_uV; | |
c00dc359 BA |
2943 | goto out; |
2944 | } | |
2945 | } | |
2946 | ||
414c70cb | 2947 | /* sanity check */ |
e8eef82b MB |
2948 | if (!rdev->desc->ops->set_voltage && |
2949 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2950 | ret = -EINVAL; |
2951 | goto out; | |
2952 | } | |
2953 | ||
2954 | /* constraints check */ | |
2955 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2956 | if (ret < 0) | |
2957 | goto out; | |
0d25d09d | 2958 | |
92d7a558 | 2959 | /* restore original values in case of error */ |
c360a6df CZ |
2960 | old_min_uV = voltage->min_uV; |
2961 | old_max_uV = voltage->max_uV; | |
2962 | voltage->min_uV = min_uV; | |
2963 | voltage->max_uV = max_uV; | |
3a93f2a9 | 2964 | |
c360a6df | 2965 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, state); |
05fda3b1 | 2966 | if (ret < 0) |
92d7a558 | 2967 | goto out2; |
05fda3b1 | 2968 | |
43fc99f2 MB |
2969 | if (rdev->supply && |
2970 | regulator_ops_is_valid(rdev->supply->rdev, | |
2971 | REGULATOR_CHANGE_VOLTAGE) && | |
2c2874b1 TR |
2972 | (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage || |
2973 | rdev->desc->ops->get_voltage_sel))) { | |
fc42112c SH |
2974 | int current_supply_uV; |
2975 | int selector; | |
2976 | ||
2977 | selector = regulator_map_voltage(rdev, min_uV, max_uV); | |
2978 | if (selector < 0) { | |
2979 | ret = selector; | |
2980 | goto out2; | |
2981 | } | |
2982 | ||
00cb9f4f | 2983 | best_supply_uV = _regulator_list_voltage(rdev, selector, 0); |
fc42112c SH |
2984 | if (best_supply_uV < 0) { |
2985 | ret = best_supply_uV; | |
2986 | goto out2; | |
2987 | } | |
2988 | ||
2989 | best_supply_uV += rdev->desc->min_dropout_uV; | |
2990 | ||
2991 | current_supply_uV = _regulator_get_voltage(rdev->supply->rdev); | |
2992 | if (current_supply_uV < 0) { | |
2993 | ret = current_supply_uV; | |
2994 | goto out2; | |
2995 | } | |
2996 | ||
2997 | supply_change_uV = best_supply_uV - current_supply_uV; | |
2998 | } | |
2999 | ||
3000 | if (supply_change_uV > 0) { | |
3001 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3002 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3003 | if (ret) { |
3004 | dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n", | |
3005 | ret); | |
3006 | goto out2; | |
3007 | } | |
3008 | } | |
3009 | ||
f7efad10 CZ |
3010 | if (state == PM_SUSPEND_ON) |
3011 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3012 | else | |
3013 | ret = _regulator_do_set_suspend_voltage(rdev, min_uV, | |
3014 | max_uV, state); | |
92d7a558 PP |
3015 | if (ret < 0) |
3016 | goto out2; | |
0d25d09d | 3017 | |
fc42112c SH |
3018 | if (supply_change_uV < 0) { |
3019 | ret = regulator_set_voltage_unlocked(rdev->supply, | |
c360a6df | 3020 | best_supply_uV, INT_MAX, state); |
fc42112c SH |
3021 | if (ret) |
3022 | dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n", | |
3023 | ret); | |
3024 | /* No need to fail here */ | |
3025 | ret = 0; | |
3026 | } | |
3027 | ||
414c70cb | 3028 | out: |
414c70cb | 3029 | return ret; |
92d7a558 | 3030 | out2: |
c360a6df CZ |
3031 | voltage->min_uV = old_min_uV; |
3032 | voltage->max_uV = old_max_uV; | |
a9f226bc SH |
3033 | |
3034 | return ret; | |
3035 | } | |
3036 | ||
3037 | /** | |
3038 | * regulator_set_voltage - set regulator output voltage | |
3039 | * @regulator: regulator source | |
3040 | * @min_uV: Minimum required voltage in uV | |
3041 | * @max_uV: Maximum acceptable voltage in uV | |
3042 | * | |
3043 | * Sets a voltage regulator to the desired output voltage. This can be set | |
3044 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
3045 | * | |
3046 | * If the regulator is enabled then the voltage will change to the new value | |
3047 | * immediately otherwise if the regulator is disabled the regulator will | |
3048 | * output at the new voltage when enabled. | |
3049 | * | |
3050 | * NOTE: If the regulator is shared between several devices then the lowest | |
3051 | * request voltage that meets the system constraints will be used. | |
3052 | * Regulator system constraints must be set for this regulator before | |
3053 | * calling this function otherwise this call will fail. | |
3054 | */ | |
3055 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
3056 | { | |
3057 | int ret = 0; | |
3058 | ||
fc42112c | 3059 | regulator_lock_supply(regulator->rdev); |
a9f226bc | 3060 | |
c360a6df CZ |
3061 | ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV, |
3062 | PM_SUSPEND_ON); | |
a9f226bc | 3063 | |
fc42112c | 3064 | regulator_unlock_supply(regulator->rdev); |
a9f226bc | 3065 | |
414c70cb LG |
3066 | return ret; |
3067 | } | |
3068 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
3069 | ||
f7efad10 CZ |
3070 | static inline int regulator_suspend_toggle(struct regulator_dev *rdev, |
3071 | suspend_state_t state, bool en) | |
3072 | { | |
3073 | struct regulator_state *rstate; | |
3074 | ||
3075 | rstate = regulator_get_suspend_state(rdev, state); | |
3076 | if (rstate == NULL) | |
3077 | return -EINVAL; | |
3078 | ||
3079 | if (!rstate->changeable) | |
3080 | return -EPERM; | |
3081 | ||
3082 | rstate->enabled = en; | |
3083 | ||
3084 | return 0; | |
3085 | } | |
3086 | ||
3087 | int regulator_suspend_enable(struct regulator_dev *rdev, | |
3088 | suspend_state_t state) | |
3089 | { | |
3090 | return regulator_suspend_toggle(rdev, state, true); | |
3091 | } | |
3092 | EXPORT_SYMBOL_GPL(regulator_suspend_enable); | |
3093 | ||
3094 | int regulator_suspend_disable(struct regulator_dev *rdev, | |
3095 | suspend_state_t state) | |
3096 | { | |
3097 | struct regulator *regulator; | |
3098 | struct regulator_voltage *voltage; | |
3099 | ||
3100 | /* | |
3101 | * if any consumer wants this regulator device keeping on in | |
3102 | * suspend states, don't set it as disabled. | |
3103 | */ | |
3104 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
3105 | voltage = ®ulator->voltage[state]; | |
3106 | if (voltage->min_uV || voltage->max_uV) | |
3107 | return 0; | |
3108 | } | |
3109 | ||
3110 | return regulator_suspend_toggle(rdev, state, false); | |
3111 | } | |
3112 | EXPORT_SYMBOL_GPL(regulator_suspend_disable); | |
3113 | ||
3114 | static int _regulator_set_suspend_voltage(struct regulator *regulator, | |
3115 | int min_uV, int max_uV, | |
3116 | suspend_state_t state) | |
3117 | { | |
3118 | struct regulator_dev *rdev = regulator->rdev; | |
3119 | struct regulator_state *rstate; | |
3120 | ||
3121 | rstate = regulator_get_suspend_state(rdev, state); | |
3122 | if (rstate == NULL) | |
3123 | return -EINVAL; | |
3124 | ||
3125 | if (rstate->min_uV == rstate->max_uV) { | |
3126 | rdev_err(rdev, "The suspend voltage can't be changed!\n"); | |
3127 | return -EPERM; | |
3128 | } | |
3129 | ||
3130 | return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state); | |
3131 | } | |
3132 | ||
3133 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, | |
3134 | int max_uV, suspend_state_t state) | |
3135 | { | |
3136 | int ret = 0; | |
3137 | ||
3138 | /* PM_SUSPEND_ON is handled by regulator_set_voltage() */ | |
3139 | if (regulator_check_states(state) || state == PM_SUSPEND_ON) | |
3140 | return -EINVAL; | |
3141 | ||
3142 | regulator_lock_supply(regulator->rdev); | |
3143 | ||
3144 | ret = _regulator_set_suspend_voltage(regulator, min_uV, | |
3145 | max_uV, state); | |
3146 | ||
3147 | regulator_unlock_supply(regulator->rdev); | |
3148 | ||
3149 | return ret; | |
3150 | } | |
3151 | EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage); | |
3152 | ||
88cd222b LW |
3153 | /** |
3154 | * regulator_set_voltage_time - get raise/fall time | |
3155 | * @regulator: regulator source | |
3156 | * @old_uV: starting voltage in microvolts | |
3157 | * @new_uV: target voltage in microvolts | |
3158 | * | |
3159 | * Provided with the starting and ending voltage, this function attempts to | |
3160 | * calculate the time in microseconds required to rise or fall to this new | |
3161 | * voltage. | |
3162 | */ | |
3163 | int regulator_set_voltage_time(struct regulator *regulator, | |
3164 | int old_uV, int new_uV) | |
3165 | { | |
272e2315 GX |
3166 | struct regulator_dev *rdev = regulator->rdev; |
3167 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
3168 | int old_sel = -1; |
3169 | int new_sel = -1; | |
3170 | int voltage; | |
3171 | int i; | |
3172 | ||
73e705bf MK |
3173 | if (ops->set_voltage_time) |
3174 | return ops->set_voltage_time(rdev, old_uV, new_uV); | |
3175 | else if (!ops->set_voltage_time_sel) | |
3176 | return _regulator_set_voltage_time(rdev, old_uV, new_uV); | |
3177 | ||
88cd222b | 3178 | /* Currently requires operations to do this */ |
73e705bf | 3179 | if (!ops->list_voltage || !rdev->desc->n_voltages) |
88cd222b LW |
3180 | return -EINVAL; |
3181 | ||
3182 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
3183 | /* We only look for exact voltage matches here */ | |
3184 | voltage = regulator_list_voltage(regulator, i); | |
3185 | if (voltage < 0) | |
3186 | return -EINVAL; | |
3187 | if (voltage == 0) | |
3188 | continue; | |
3189 | if (voltage == old_uV) | |
3190 | old_sel = i; | |
3191 | if (voltage == new_uV) | |
3192 | new_sel = i; | |
3193 | } | |
3194 | ||
3195 | if (old_sel < 0 || new_sel < 0) | |
3196 | return -EINVAL; | |
3197 | ||
3198 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
3199 | } | |
3200 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
3201 | ||
98a175b6 | 3202 | /** |
296c6566 RD |
3203 | * regulator_set_voltage_time_sel - get raise/fall time |
3204 | * @rdev: regulator source device | |
98a175b6 YSB |
3205 | * @old_selector: selector for starting voltage |
3206 | * @new_selector: selector for target voltage | |
3207 | * | |
3208 | * Provided with the starting and target voltage selectors, this function | |
3209 | * returns time in microseconds required to rise or fall to this new voltage | |
3210 | * | |
f11d08c3 | 3211 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 3212 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
3213 | */ |
3214 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
3215 | unsigned int old_selector, | |
3216 | unsigned int new_selector) | |
3217 | { | |
f11d08c3 | 3218 | int old_volt, new_volt; |
398715ab | 3219 | |
f11d08c3 AL |
3220 | /* sanity check */ |
3221 | if (!rdev->desc->ops->list_voltage) | |
3222 | return -EINVAL; | |
398715ab | 3223 | |
f11d08c3 AL |
3224 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
3225 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
3226 | ||
73e705bf MK |
3227 | if (rdev->desc->ops->set_voltage_time) |
3228 | return rdev->desc->ops->set_voltage_time(rdev, old_volt, | |
3229 | new_volt); | |
3230 | else | |
3231 | return _regulator_set_voltage_time(rdev, old_volt, new_volt); | |
98a175b6 | 3232 | } |
b19dbf71 | 3233 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 3234 | |
606a2562 MB |
3235 | /** |
3236 | * regulator_sync_voltage - re-apply last regulator output voltage | |
3237 | * @regulator: regulator source | |
3238 | * | |
3239 | * Re-apply the last configured voltage. This is intended to be used | |
3240 | * where some external control source the consumer is cooperating with | |
3241 | * has caused the configured voltage to change. | |
3242 | */ | |
3243 | int regulator_sync_voltage(struct regulator *regulator) | |
3244 | { | |
3245 | struct regulator_dev *rdev = regulator->rdev; | |
c360a6df | 3246 | struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON]; |
606a2562 MB |
3247 | int ret, min_uV, max_uV; |
3248 | ||
3249 | mutex_lock(&rdev->mutex); | |
3250 | ||
3251 | if (!rdev->desc->ops->set_voltage && | |
3252 | !rdev->desc->ops->set_voltage_sel) { | |
3253 | ret = -EINVAL; | |
3254 | goto out; | |
3255 | } | |
3256 | ||
3257 | /* This is only going to work if we've had a voltage configured. */ | |
c360a6df | 3258 | if (!voltage->min_uV && !voltage->max_uV) { |
606a2562 MB |
3259 | ret = -EINVAL; |
3260 | goto out; | |
3261 | } | |
3262 | ||
c360a6df CZ |
3263 | min_uV = voltage->min_uV; |
3264 | max_uV = voltage->max_uV; | |
606a2562 MB |
3265 | |
3266 | /* This should be a paranoia check... */ | |
3267 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
3268 | if (ret < 0) | |
3269 | goto out; | |
3270 | ||
c360a6df | 3271 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0); |
606a2562 MB |
3272 | if (ret < 0) |
3273 | goto out; | |
3274 | ||
3275 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
3276 | ||
3277 | out: | |
3278 | mutex_unlock(&rdev->mutex); | |
3279 | return ret; | |
3280 | } | |
3281 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
3282 | ||
414c70cb LG |
3283 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
3284 | { | |
bf5892a8 | 3285 | int sel, ret; |
fef95019 MB |
3286 | bool bypassed; |
3287 | ||
3288 | if (rdev->desc->ops->get_bypass) { | |
3289 | ret = rdev->desc->ops->get_bypass(rdev, &bypassed); | |
3290 | if (ret < 0) | |
3291 | return ret; | |
3292 | if (bypassed) { | |
3293 | /* if bypassed the regulator must have a supply */ | |
45389c47 JH |
3294 | if (!rdev->supply) { |
3295 | rdev_err(rdev, | |
3296 | "bypassed regulator has no supply!\n"); | |
3297 | return -EPROBE_DEFER; | |
3298 | } | |
fef95019 MB |
3299 | |
3300 | return _regulator_get_voltage(rdev->supply->rdev); | |
3301 | } | |
3302 | } | |
476c2d83 MB |
3303 | |
3304 | if (rdev->desc->ops->get_voltage_sel) { | |
3305 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
3306 | if (sel < 0) | |
3307 | return sel; | |
bf5892a8 | 3308 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 3309 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 3310 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
3311 | } else if (rdev->desc->ops->list_voltage) { |
3312 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
3313 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
3314 | ret = rdev->desc->fixed_uV; | |
e303996e | 3315 | } else if (rdev->supply) { |
d9b96d35 | 3316 | ret = _regulator_get_voltage(rdev->supply->rdev); |
cb220d16 | 3317 | } else { |
414c70cb | 3318 | return -EINVAL; |
cb220d16 | 3319 | } |
bf5892a8 | 3320 | |
cb220d16 AL |
3321 | if (ret < 0) |
3322 | return ret; | |
bf5892a8 | 3323 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
3324 | } |
3325 | ||
3326 | /** | |
3327 | * regulator_get_voltage - get regulator output voltage | |
3328 | * @regulator: regulator source | |
3329 | * | |
3330 | * This returns the current regulator voltage in uV. | |
3331 | * | |
3332 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
3333 | * function should not be used to determine regulator state. | |
3334 | */ | |
3335 | int regulator_get_voltage(struct regulator *regulator) | |
3336 | { | |
3337 | int ret; | |
3338 | ||
d9b96d35 | 3339 | regulator_lock_supply(regulator->rdev); |
414c70cb LG |
3340 | |
3341 | ret = _regulator_get_voltage(regulator->rdev); | |
3342 | ||
d9b96d35 | 3343 | regulator_unlock_supply(regulator->rdev); |
414c70cb LG |
3344 | |
3345 | return ret; | |
3346 | } | |
3347 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
3348 | ||
3349 | /** | |
3350 | * regulator_set_current_limit - set regulator output current limit | |
3351 | * @regulator: regulator source | |
ce0d10f8 | 3352 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
3353 | * @max_uA: Maximum supported current in uA |
3354 | * | |
3355 | * Sets current sink to the desired output current. This can be set during | |
3356 | * any regulator state. IOW, regulator can be disabled or enabled. | |
3357 | * | |
3358 | * If the regulator is enabled then the current will change to the new value | |
3359 | * immediately otherwise if the regulator is disabled the regulator will | |
3360 | * output at the new current when enabled. | |
3361 | * | |
3362 | * NOTE: Regulator system constraints must be set for this regulator before | |
3363 | * calling this function otherwise this call will fail. | |
3364 | */ | |
3365 | int regulator_set_current_limit(struct regulator *regulator, | |
3366 | int min_uA, int max_uA) | |
3367 | { | |
3368 | struct regulator_dev *rdev = regulator->rdev; | |
3369 | int ret; | |
3370 | ||
3371 | mutex_lock(&rdev->mutex); | |
3372 | ||
3373 | /* sanity check */ | |
3374 | if (!rdev->desc->ops->set_current_limit) { | |
3375 | ret = -EINVAL; | |
3376 | goto out; | |
3377 | } | |
3378 | ||
3379 | /* constraints check */ | |
3380 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
3381 | if (ret < 0) | |
3382 | goto out; | |
3383 | ||
3384 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
3385 | out: | |
3386 | mutex_unlock(&rdev->mutex); | |
3387 | return ret; | |
3388 | } | |
3389 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
3390 | ||
3391 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
3392 | { | |
3393 | int ret; | |
3394 | ||
3395 | mutex_lock(&rdev->mutex); | |
3396 | ||
3397 | /* sanity check */ | |
3398 | if (!rdev->desc->ops->get_current_limit) { | |
3399 | ret = -EINVAL; | |
3400 | goto out; | |
3401 | } | |
3402 | ||
3403 | ret = rdev->desc->ops->get_current_limit(rdev); | |
3404 | out: | |
3405 | mutex_unlock(&rdev->mutex); | |
3406 | return ret; | |
3407 | } | |
3408 | ||
3409 | /** | |
3410 | * regulator_get_current_limit - get regulator output current | |
3411 | * @regulator: regulator source | |
3412 | * | |
3413 | * This returns the current supplied by the specified current sink in uA. | |
3414 | * | |
3415 | * NOTE: If the regulator is disabled it will return the current value. This | |
3416 | * function should not be used to determine regulator state. | |
3417 | */ | |
3418 | int regulator_get_current_limit(struct regulator *regulator) | |
3419 | { | |
3420 | return _regulator_get_current_limit(regulator->rdev); | |
3421 | } | |
3422 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
3423 | ||
3424 | /** | |
3425 | * regulator_set_mode - set regulator operating mode | |
3426 | * @regulator: regulator source | |
3427 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
3428 | * | |
3429 | * Set regulator operating mode to increase regulator efficiency or improve | |
3430 | * regulation performance. | |
3431 | * | |
3432 | * NOTE: Regulator system constraints must be set for this regulator before | |
3433 | * calling this function otherwise this call will fail. | |
3434 | */ | |
3435 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3436 | { | |
3437 | struct regulator_dev *rdev = regulator->rdev; | |
3438 | int ret; | |
500b4ac9 | 3439 | int regulator_curr_mode; |
414c70cb LG |
3440 | |
3441 | mutex_lock(&rdev->mutex); | |
3442 | ||
3443 | /* sanity check */ | |
3444 | if (!rdev->desc->ops->set_mode) { | |
3445 | ret = -EINVAL; | |
3446 | goto out; | |
3447 | } | |
3448 | ||
500b4ac9 SI |
3449 | /* return if the same mode is requested */ |
3450 | if (rdev->desc->ops->get_mode) { | |
3451 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3452 | if (regulator_curr_mode == mode) { | |
3453 | ret = 0; | |
3454 | goto out; | |
3455 | } | |
3456 | } | |
3457 | ||
414c70cb | 3458 | /* constraints check */ |
22c51b47 | 3459 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3460 | if (ret < 0) |
3461 | goto out; | |
3462 | ||
3463 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3464 | out: | |
3465 | mutex_unlock(&rdev->mutex); | |
3466 | return ret; | |
3467 | } | |
3468 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3469 | ||
3470 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3471 | { | |
3472 | int ret; | |
3473 | ||
3474 | mutex_lock(&rdev->mutex); | |
3475 | ||
3476 | /* sanity check */ | |
3477 | if (!rdev->desc->ops->get_mode) { | |
3478 | ret = -EINVAL; | |
3479 | goto out; | |
3480 | } | |
3481 | ||
3482 | ret = rdev->desc->ops->get_mode(rdev); | |
3483 | out: | |
3484 | mutex_unlock(&rdev->mutex); | |
3485 | return ret; | |
3486 | } | |
3487 | ||
3488 | /** | |
3489 | * regulator_get_mode - get regulator operating mode | |
3490 | * @regulator: regulator source | |
3491 | * | |
3492 | * Get the current regulator operating mode. | |
3493 | */ | |
3494 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3495 | { | |
3496 | return _regulator_get_mode(regulator->rdev); | |
3497 | } | |
3498 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3499 | ||
1b5b4221 AH |
3500 | static int _regulator_get_error_flags(struct regulator_dev *rdev, |
3501 | unsigned int *flags) | |
3502 | { | |
3503 | int ret; | |
3504 | ||
3505 | mutex_lock(&rdev->mutex); | |
3506 | ||
3507 | /* sanity check */ | |
3508 | if (!rdev->desc->ops->get_error_flags) { | |
3509 | ret = -EINVAL; | |
3510 | goto out; | |
3511 | } | |
3512 | ||
3513 | ret = rdev->desc->ops->get_error_flags(rdev, flags); | |
3514 | out: | |
3515 | mutex_unlock(&rdev->mutex); | |
3516 | return ret; | |
3517 | } | |
3518 | ||
3519 | /** | |
3520 | * regulator_get_error_flags - get regulator error information | |
3521 | * @regulator: regulator source | |
3522 | * @flags: pointer to store error flags | |
3523 | * | |
3524 | * Get the current regulator error information. | |
3525 | */ | |
3526 | int regulator_get_error_flags(struct regulator *regulator, | |
3527 | unsigned int *flags) | |
3528 | { | |
3529 | return _regulator_get_error_flags(regulator->rdev, flags); | |
3530 | } | |
3531 | EXPORT_SYMBOL_GPL(regulator_get_error_flags); | |
3532 | ||
414c70cb | 3533 | /** |
e39ce48f | 3534 | * regulator_set_load - set regulator load |
414c70cb LG |
3535 | * @regulator: regulator source |
3536 | * @uA_load: load current | |
3537 | * | |
3538 | * Notifies the regulator core of a new device load. This is then used by | |
3539 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3540 | * operating mode for the new regulator loading. | |
3541 | * | |
3542 | * Consumer devices notify their supply regulator of the maximum power | |
3543 | * they will require (can be taken from device datasheet in the power | |
3544 | * consumption tables) when they change operational status and hence power | |
3545 | * state. Examples of operational state changes that can affect power | |
3546 | * consumption are :- | |
3547 | * | |
3548 | * o Device is opened / closed. | |
3549 | * o Device I/O is about to begin or has just finished. | |
3550 | * o Device is idling in between work. | |
3551 | * | |
3552 | * This information is also exported via sysfs to userspace. | |
3553 | * | |
3554 | * DRMS will sum the total requested load on the regulator and change | |
3555 | * to the most efficient operating mode if platform constraints allow. | |
3556 | * | |
e39ce48f | 3557 | * On error a negative errno is returned. |
414c70cb | 3558 | */ |
e39ce48f | 3559 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3560 | { |
3561 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3562 | int ret; |
d92d95b6 | 3563 | |
414c70cb | 3564 | mutex_lock(&rdev->mutex); |
414c70cb | 3565 | regulator->uA_load = uA_load; |
8460ef38 | 3566 | ret = drms_uA_update(rdev); |
414c70cb | 3567 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3568 | |
414c70cb LG |
3569 | return ret; |
3570 | } | |
e39ce48f | 3571 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3572 | |
f59c8f9f MB |
3573 | /** |
3574 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3575 | * | |
3576 | * @regulator: Regulator to configure | |
9345dfb8 | 3577 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3578 | * |
3579 | * Allow the regulator to go into bypass mode if all other consumers | |
3580 | * for the regulator also enable bypass mode and the machine | |
3581 | * constraints allow this. Bypass mode means that the regulator is | |
3582 | * simply passing the input directly to the output with no regulation. | |
3583 | */ | |
3584 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3585 | { | |
3586 | struct regulator_dev *rdev = regulator->rdev; | |
3587 | int ret = 0; | |
3588 | ||
3589 | if (!rdev->desc->ops->set_bypass) | |
3590 | return 0; | |
3591 | ||
8a34e979 | 3592 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS)) |
f59c8f9f MB |
3593 | return 0; |
3594 | ||
3595 | mutex_lock(&rdev->mutex); | |
3596 | ||
3597 | if (enable && !regulator->bypass) { | |
3598 | rdev->bypass_count++; | |
3599 | ||
3600 | if (rdev->bypass_count == rdev->open_count) { | |
3601 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3602 | if (ret != 0) | |
3603 | rdev->bypass_count--; | |
3604 | } | |
3605 | ||
3606 | } else if (!enable && regulator->bypass) { | |
3607 | rdev->bypass_count--; | |
3608 | ||
3609 | if (rdev->bypass_count != rdev->open_count) { | |
3610 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3611 | if (ret != 0) | |
3612 | rdev->bypass_count++; | |
3613 | } | |
3614 | } | |
3615 | ||
3616 | if (ret == 0) | |
3617 | regulator->bypass = enable; | |
3618 | ||
3619 | mutex_unlock(&rdev->mutex); | |
3620 | ||
3621 | return ret; | |
3622 | } | |
3623 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3624 | ||
414c70cb LG |
3625 | /** |
3626 | * regulator_register_notifier - register regulator event notifier | |
3627 | * @regulator: regulator source | |
69279fb9 | 3628 | * @nb: notifier block |
414c70cb LG |
3629 | * |
3630 | * Register notifier block to receive regulator events. | |
3631 | */ | |
3632 | int regulator_register_notifier(struct regulator *regulator, | |
3633 | struct notifier_block *nb) | |
3634 | { | |
3635 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3636 | nb); | |
3637 | } | |
3638 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3639 | ||
3640 | /** | |
3641 | * regulator_unregister_notifier - unregister regulator event notifier | |
3642 | * @regulator: regulator source | |
69279fb9 | 3643 | * @nb: notifier block |
414c70cb LG |
3644 | * |
3645 | * Unregister regulator event notifier block. | |
3646 | */ | |
3647 | int regulator_unregister_notifier(struct regulator *regulator, | |
3648 | struct notifier_block *nb) | |
3649 | { | |
3650 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3651 | nb); | |
3652 | } | |
3653 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3654 | ||
b136fb44 JC |
3655 | /* notify regulator consumers and downstream regulator consumers. |
3656 | * Note mutex must be held by caller. | |
3657 | */ | |
7179569a | 3658 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3659 | unsigned long event, void *data) |
3660 | { | |
414c70cb | 3661 | /* call rdev chain first */ |
7179569a | 3662 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3663 | } |
3664 | ||
3665 | /** | |
3666 | * regulator_bulk_get - get multiple regulator consumers | |
3667 | * | |
3668 | * @dev: Device to supply | |
3669 | * @num_consumers: Number of consumers to register | |
3670 | * @consumers: Configuration of consumers; clients are stored here. | |
3671 | * | |
3672 | * @return 0 on success, an errno on failure. | |
3673 | * | |
3674 | * This helper function allows drivers to get several regulator | |
3675 | * consumers in one operation. If any of the regulators cannot be | |
3676 | * acquired then any regulators that were allocated will be freed | |
3677 | * before returning to the caller. | |
3678 | */ | |
3679 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3680 | struct regulator_bulk_data *consumers) | |
3681 | { | |
3682 | int i; | |
3683 | int ret; | |
3684 | ||
3685 | for (i = 0; i < num_consumers; i++) | |
3686 | consumers[i].consumer = NULL; | |
3687 | ||
3688 | for (i = 0; i < num_consumers; i++) { | |
565f9b07 BA |
3689 | consumers[i].consumer = regulator_get(dev, |
3690 | consumers[i].supply); | |
414c70cb | 3691 | if (IS_ERR(consumers[i].consumer)) { |
414c70cb | 3692 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3693 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3694 | consumers[i].supply, ret); | |
414c70cb LG |
3695 | consumers[i].consumer = NULL; |
3696 | goto err; | |
3697 | } | |
3698 | } | |
3699 | ||
3700 | return 0; | |
3701 | ||
3702 | err: | |
b29c7690 | 3703 | while (--i >= 0) |
414c70cb LG |
3704 | regulator_put(consumers[i].consumer); |
3705 | ||
3706 | return ret; | |
3707 | } | |
3708 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3709 | ||
f21e0e81 MB |
3710 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3711 | { | |
3712 | struct regulator_bulk_data *bulk = data; | |
3713 | ||
3714 | bulk->ret = regulator_enable(bulk->consumer); | |
3715 | } | |
3716 | ||
414c70cb LG |
3717 | /** |
3718 | * regulator_bulk_enable - enable multiple regulator consumers | |
3719 | * | |
3720 | * @num_consumers: Number of consumers | |
3721 | * @consumers: Consumer data; clients are stored here. | |
3722 | * @return 0 on success, an errno on failure | |
3723 | * | |
3724 | * This convenience API allows consumers to enable multiple regulator | |
3725 | * clients in a single API call. If any consumers cannot be enabled | |
3726 | * then any others that were enabled will be disabled again prior to | |
3727 | * return. | |
3728 | */ | |
3729 | int regulator_bulk_enable(int num_consumers, | |
3730 | struct regulator_bulk_data *consumers) | |
3731 | { | |
2955b47d | 3732 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3733 | int i; |
f21e0e81 | 3734 | int ret = 0; |
414c70cb | 3735 | |
6492bc1b MB |
3736 | for (i = 0; i < num_consumers; i++) { |
3737 | if (consumers[i].consumer->always_on) | |
3738 | consumers[i].ret = 0; | |
3739 | else | |
3740 | async_schedule_domain(regulator_bulk_enable_async, | |
3741 | &consumers[i], &async_domain); | |
3742 | } | |
f21e0e81 MB |
3743 | |
3744 | async_synchronize_full_domain(&async_domain); | |
3745 | ||
3746 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3747 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3748 | if (consumers[i].ret != 0) { |
3749 | ret = consumers[i].ret; | |
414c70cb | 3750 | goto err; |
f21e0e81 | 3751 | } |
414c70cb LG |
3752 | } |
3753 | ||
3754 | return 0; | |
3755 | ||
3756 | err: | |
fbe31057 AH |
3757 | for (i = 0; i < num_consumers; i++) { |
3758 | if (consumers[i].ret < 0) | |
3759 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3760 | consumers[i].ret); | |
3761 | else | |
3762 | regulator_disable(consumers[i].consumer); | |
3763 | } | |
414c70cb LG |
3764 | |
3765 | return ret; | |
3766 | } | |
3767 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3768 | ||
3769 | /** | |
3770 | * regulator_bulk_disable - disable multiple regulator consumers | |
3771 | * | |
3772 | * @num_consumers: Number of consumers | |
3773 | * @consumers: Consumer data; clients are stored here. | |
3774 | * @return 0 on success, an errno on failure | |
3775 | * | |
3776 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3777 | * clients in a single API call. If any consumers cannot be disabled |
3778 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3779 | * return. |
3780 | */ | |
3781 | int regulator_bulk_disable(int num_consumers, | |
3782 | struct regulator_bulk_data *consumers) | |
3783 | { | |
3784 | int i; | |
01e86f49 | 3785 | int ret, r; |
414c70cb | 3786 | |
49e22632 | 3787 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3788 | ret = regulator_disable(consumers[i].consumer); |
3789 | if (ret != 0) | |
3790 | goto err; | |
3791 | } | |
3792 | ||
3793 | return 0; | |
3794 | ||
3795 | err: | |
5da84fd9 | 3796 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3797 | for (++i; i < num_consumers; ++i) { |
3798 | r = regulator_enable(consumers[i].consumer); | |
3799 | if (r != 0) | |
d1642ea7 | 3800 | pr_err("Failed to re-enable %s: %d\n", |
01e86f49 MB |
3801 | consumers[i].supply, r); |
3802 | } | |
414c70cb LG |
3803 | |
3804 | return ret; | |
3805 | } | |
3806 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3807 | ||
e1de2f42 DK |
3808 | /** |
3809 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3810 | * | |
3811 | * @num_consumers: Number of consumers | |
3812 | * @consumers: Consumer data; clients are stored here. | |
3813 | * @return 0 on success, an errno on failure | |
3814 | * | |
3815 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3816 | * clients in a single API call. | |
3817 | * NOTE: This should be used for situations when device damage will | |
3818 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3819 | * Although regulator_force_disable function call for some consumers can | |
3820 | * return error numbers, the function is called for all consumers. | |
3821 | */ | |
3822 | int regulator_bulk_force_disable(int num_consumers, | |
3823 | struct regulator_bulk_data *consumers) | |
3824 | { | |
3825 | int i; | |
b8c77ff6 | 3826 | int ret = 0; |
e1de2f42 | 3827 | |
b8c77ff6 | 3828 | for (i = 0; i < num_consumers; i++) { |
e1de2f42 DK |
3829 | consumers[i].ret = |
3830 | regulator_force_disable(consumers[i].consumer); | |
3831 | ||
b8c77ff6 DT |
3832 | /* Store first error for reporting */ |
3833 | if (consumers[i].ret && !ret) | |
e1de2f42 | 3834 | ret = consumers[i].ret; |
e1de2f42 DK |
3835 | } |
3836 | ||
e1de2f42 DK |
3837 | return ret; |
3838 | } | |
3839 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3840 | ||
414c70cb LG |
3841 | /** |
3842 | * regulator_bulk_free - free multiple regulator consumers | |
3843 | * | |
3844 | * @num_consumers: Number of consumers | |
3845 | * @consumers: Consumer data; clients are stored here. | |
3846 | * | |
3847 | * This convenience API allows consumers to free multiple regulator | |
3848 | * clients in a single API call. | |
3849 | */ | |
3850 | void regulator_bulk_free(int num_consumers, | |
3851 | struct regulator_bulk_data *consumers) | |
3852 | { | |
3853 | int i; | |
3854 | ||
3855 | for (i = 0; i < num_consumers; i++) { | |
3856 | regulator_put(consumers[i].consumer); | |
3857 | consumers[i].consumer = NULL; | |
3858 | } | |
3859 | } | |
3860 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3861 | ||
3862 | /** | |
3863 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3864 | * @rdev: regulator source |
414c70cb | 3865 | * @event: notifier block |
69279fb9 | 3866 | * @data: callback-specific data. |
414c70cb LG |
3867 | * |
3868 | * Called by regulator drivers to notify clients a regulator event has | |
3869 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3870 | * Note lock must be held by caller. |
414c70cb LG |
3871 | */ |
3872 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3873 | unsigned long event, void *data) | |
3874 | { | |
70cfef26 KK |
3875 | lockdep_assert_held_once(&rdev->mutex); |
3876 | ||
414c70cb LG |
3877 | _notifier_call_chain(rdev, event, data); |
3878 | return NOTIFY_DONE; | |
3879 | ||
3880 | } | |
3881 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3882 | ||
be721979 MB |
3883 | /** |
3884 | * regulator_mode_to_status - convert a regulator mode into a status | |
3885 | * | |
3886 | * @mode: Mode to convert | |
3887 | * | |
3888 | * Convert a regulator mode into a status. | |
3889 | */ | |
3890 | int regulator_mode_to_status(unsigned int mode) | |
3891 | { | |
3892 | switch (mode) { | |
3893 | case REGULATOR_MODE_FAST: | |
3894 | return REGULATOR_STATUS_FAST; | |
3895 | case REGULATOR_MODE_NORMAL: | |
3896 | return REGULATOR_STATUS_NORMAL; | |
3897 | case REGULATOR_MODE_IDLE: | |
3898 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3899 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3900 | return REGULATOR_STATUS_STANDBY; |
3901 | default: | |
1beaf762 | 3902 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3903 | } |
3904 | } | |
3905 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3906 | ||
39f802d6 TI |
3907 | static struct attribute *regulator_dev_attrs[] = { |
3908 | &dev_attr_name.attr, | |
3909 | &dev_attr_num_users.attr, | |
3910 | &dev_attr_type.attr, | |
3911 | &dev_attr_microvolts.attr, | |
3912 | &dev_attr_microamps.attr, | |
3913 | &dev_attr_opmode.attr, | |
3914 | &dev_attr_state.attr, | |
3915 | &dev_attr_status.attr, | |
3916 | &dev_attr_bypass.attr, | |
3917 | &dev_attr_requested_microamps.attr, | |
3918 | &dev_attr_min_microvolts.attr, | |
3919 | &dev_attr_max_microvolts.attr, | |
3920 | &dev_attr_min_microamps.attr, | |
3921 | &dev_attr_max_microamps.attr, | |
3922 | &dev_attr_suspend_standby_state.attr, | |
3923 | &dev_attr_suspend_mem_state.attr, | |
3924 | &dev_attr_suspend_disk_state.attr, | |
3925 | &dev_attr_suspend_standby_microvolts.attr, | |
3926 | &dev_attr_suspend_mem_microvolts.attr, | |
3927 | &dev_attr_suspend_disk_microvolts.attr, | |
3928 | &dev_attr_suspend_standby_mode.attr, | |
3929 | &dev_attr_suspend_mem_mode.attr, | |
3930 | &dev_attr_suspend_disk_mode.attr, | |
3931 | NULL | |
3932 | }; | |
3933 | ||
7ad68e2f DB |
3934 | /* |
3935 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3936 | * create attributes that can be meaningfully displayed. | |
3937 | */ | |
39f802d6 TI |
3938 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3939 | struct attribute *attr, int idx) | |
7ad68e2f | 3940 | { |
39f802d6 | 3941 | struct device *dev = kobj_to_dev(kobj); |
83080a14 | 3942 | struct regulator_dev *rdev = dev_to_rdev(dev); |
272e2315 | 3943 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3944 | umode_t mode = attr->mode; |
3945 | ||
3946 | /* these three are always present */ | |
3947 | if (attr == &dev_attr_name.attr || | |
3948 | attr == &dev_attr_num_users.attr || | |
3949 | attr == &dev_attr_type.attr) | |
3950 | return mode; | |
7ad68e2f DB |
3951 | |
3952 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3953 | if (attr == &dev_attr_microvolts.attr) { |
3954 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3955 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3956 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3957 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3958 | return mode; | |
3959 | return 0; | |
f59c8f9f | 3960 | } |
7ad68e2f | 3961 | |
39f802d6 TI |
3962 | if (attr == &dev_attr_microamps.attr) |
3963 | return ops->get_current_limit ? mode : 0; | |
3964 | ||
3965 | if (attr == &dev_attr_opmode.attr) | |
3966 | return ops->get_mode ? mode : 0; | |
3967 | ||
3968 | if (attr == &dev_attr_state.attr) | |
3969 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3970 | ||
3971 | if (attr == &dev_attr_status.attr) | |
3972 | return ops->get_status ? mode : 0; | |
3973 | ||
3974 | if (attr == &dev_attr_bypass.attr) | |
3975 | return ops->get_bypass ? mode : 0; | |
3976 | ||
7ad68e2f | 3977 | /* some attributes are type-specific */ |
39f802d6 TI |
3978 | if (attr == &dev_attr_requested_microamps.attr) |
3979 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3980 | |
7ad68e2f | 3981 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3982 | if (attr == &dev_attr_min_microvolts.attr || |
3983 | attr == &dev_attr_max_microvolts.attr) | |
3984 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3985 | ||
3986 | if (attr == &dev_attr_min_microamps.attr || | |
3987 | attr == &dev_attr_max_microamps.attr) | |
3988 | return ops->set_current_limit ? mode : 0; | |
3989 | ||
3990 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3991 | attr == &dev_attr_suspend_mem_state.attr || | |
3992 | attr == &dev_attr_suspend_disk_state.attr) | |
3993 | return mode; | |
3994 | ||
3995 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3996 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3997 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3998 | return ops->set_suspend_voltage ? mode : 0; | |
3999 | ||
4000 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
4001 | attr == &dev_attr_suspend_mem_mode.attr || | |
4002 | attr == &dev_attr_suspend_disk_mode.attr) | |
4003 | return ops->set_suspend_mode ? mode : 0; | |
4004 | ||
4005 | return mode; | |
4006 | } | |
4007 | ||
4008 | static const struct attribute_group regulator_dev_group = { | |
4009 | .attrs = regulator_dev_attrs, | |
4010 | .is_visible = regulator_attr_is_visible, | |
4011 | }; | |
4012 | ||
4013 | static const struct attribute_group *regulator_dev_groups[] = { | |
4014 | ®ulator_dev_group, | |
4015 | NULL | |
4016 | }; | |
7ad68e2f | 4017 | |
39f802d6 TI |
4018 | static void regulator_dev_release(struct device *dev) |
4019 | { | |
4020 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
4021 | |
4022 | kfree(rdev->constraints); | |
4023 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 4024 | kfree(rdev); |
7ad68e2f DB |
4025 | } |
4026 | ||
1130e5b3 MB |
4027 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
4028 | { | |
a9eaa813 GR |
4029 | struct device *parent = rdev->dev.parent; |
4030 | const char *rname = rdev_get_name(rdev); | |
4031 | char name[NAME_MAX]; | |
4032 | ||
4033 | /* Avoid duplicate debugfs directory names */ | |
4034 | if (parent && rname == rdev->desc->name) { | |
4035 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
4036 | rname); | |
4037 | rname = name; | |
4038 | } | |
4039 | ||
4040 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 4041 | if (!rdev->debugfs) { |
1130e5b3 | 4042 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
4043 | return; |
4044 | } | |
4045 | ||
4046 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
4047 | &rdev->use_count); | |
4048 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
4049 | &rdev->open_count); | |
f59c8f9f MB |
4050 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
4051 | &rdev->bypass_count); | |
1130e5b3 MB |
4052 | } |
4053 | ||
5e3ca2b3 JMC |
4054 | static int regulator_register_resolve_supply(struct device *dev, void *data) |
4055 | { | |
7ddede6a JH |
4056 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4057 | ||
4058 | if (regulator_resolve_supply(rdev)) | |
4059 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4060 | ||
4061 | return 0; | |
5e3ca2b3 JMC |
4062 | } |
4063 | ||
414c70cb LG |
4064 | /** |
4065 | * regulator_register - register regulator | |
69279fb9 | 4066 | * @regulator_desc: regulator to register |
f47531b1 | 4067 | * @cfg: runtime configuration for regulator |
414c70cb LG |
4068 | * |
4069 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
4070 | * Returns a valid pointer to struct regulator_dev on success |
4071 | * or an ERR_PTR() on error. | |
414c70cb | 4072 | */ |
65f26846 MB |
4073 | struct regulator_dev * |
4074 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 4075 | const struct regulator_config *cfg) |
414c70cb | 4076 | { |
9a8f5e07 | 4077 | const struct regulation_constraints *constraints = NULL; |
c172708d | 4078 | const struct regulator_init_data *init_data; |
1b3de223 | 4079 | struct regulator_config *config = NULL; |
72dca06f | 4080 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 4081 | struct regulator_dev *rdev; |
32c8fad4 | 4082 | struct device *dev; |
a5766f11 | 4083 | int ret, i; |
414c70cb | 4084 | |
1b3de223 | 4085 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
4086 | return ERR_PTR(-EINVAL); |
4087 | ||
1b3de223 | 4088 | dev = cfg->dev; |
dcf70112 | 4089 | WARN_ON(!dev); |
32c8fad4 | 4090 | |
414c70cb LG |
4091 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
4092 | return ERR_PTR(-EINVAL); | |
4093 | ||
cd78dfc6 DL |
4094 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
4095 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
4096 | return ERR_PTR(-EINVAL); |
4097 | ||
476c2d83 MB |
4098 | /* Only one of each should be implemented */ |
4099 | WARN_ON(regulator_desc->ops->get_voltage && | |
4100 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
4101 | WARN_ON(regulator_desc->ops->set_voltage && |
4102 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
4103 | |
4104 | /* If we're using selectors we must implement list_voltage. */ | |
4105 | if (regulator_desc->ops->get_voltage_sel && | |
4106 | !regulator_desc->ops->list_voltage) { | |
4107 | return ERR_PTR(-EINVAL); | |
4108 | } | |
e8eef82b MB |
4109 | if (regulator_desc->ops->set_voltage_sel && |
4110 | !regulator_desc->ops->list_voltage) { | |
4111 | return ERR_PTR(-EINVAL); | |
4112 | } | |
476c2d83 | 4113 | |
414c70cb LG |
4114 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
4115 | if (rdev == NULL) | |
4116 | return ERR_PTR(-ENOMEM); | |
4117 | ||
1b3de223 KK |
4118 | /* |
4119 | * Duplicate the config so the driver could override it after | |
4120 | * parsing init data. | |
4121 | */ | |
4122 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
4123 | if (config == NULL) { | |
4124 | kfree(rdev); | |
4125 | return ERR_PTR(-ENOMEM); | |
4126 | } | |
4127 | ||
bfa21a0d | 4128 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
4129 | &rdev->dev.of_node); |
4130 | if (!init_data) { | |
4131 | init_data = config->init_data; | |
4132 | rdev->dev.of_node = of_node_get(config->of_node); | |
4133 | } | |
4134 | ||
414c70cb | 4135 | mutex_init(&rdev->mutex); |
c172708d | 4136 | rdev->reg_data = config->driver_data; |
414c70cb LG |
4137 | rdev->owner = regulator_desc->owner; |
4138 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
4139 | if (config->regmap) |
4140 | rdev->regmap = config->regmap; | |
52b84dac | 4141 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 4142 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
4143 | else if (dev->parent) |
4144 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 4145 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 4146 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 4147 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 4148 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 4149 | |
a5766f11 | 4150 | /* preform any regulator specific init */ |
9a8f5e07 | 4151 | if (init_data && init_data->regulator_init) { |
a5766f11 | 4152 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
4153 | if (ret < 0) |
4154 | goto clean; | |
a5766f11 LG |
4155 | } |
4156 | ||
daad134d KA |
4157 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
4158 | gpio_is_valid(config->ena_gpio)) { | |
45389c47 | 4159 | mutex_lock(®ulator_list_mutex); |
daad134d | 4160 | ret = regulator_ena_gpio_request(rdev, config); |
45389c47 | 4161 | mutex_unlock(®ulator_list_mutex); |
daad134d KA |
4162 | if (ret != 0) { |
4163 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
4164 | config->ena_gpio, ret); | |
32165230 | 4165 | goto clean; |
daad134d KA |
4166 | } |
4167 | } | |
4168 | ||
a5766f11 | 4169 | /* register with sysfs */ |
414c70cb | 4170 | rdev->dev.class = ®ulator_class; |
a5766f11 | 4171 | rdev->dev.parent = dev; |
72dca06f | 4172 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 4173 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 4174 | |
74f544c1 | 4175 | /* set regulator constraints */ |
9a8f5e07 MB |
4176 | if (init_data) |
4177 | constraints = &init_data->constraints; | |
4178 | ||
9a8f5e07 | 4179 | if (init_data && init_data->supply_regulator) |
6261b06d | 4180 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 4181 | else if (regulator_desc->supply_name) |
6261b06d | 4182 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 4183 | |
45389c47 JH |
4184 | /* |
4185 | * Attempt to resolve the regulator supply, if specified, | |
4186 | * but don't return an error if we fail because we will try | |
4187 | * to resolve it again later as more regulators are added. | |
4188 | */ | |
4189 | if (regulator_resolve_supply(rdev)) | |
4190 | rdev_dbg(rdev, "unable to resolve supply\n"); | |
4191 | ||
4192 | ret = set_machine_constraints(rdev, constraints); | |
4193 | if (ret < 0) | |
4194 | goto wash; | |
4195 | ||
a5766f11 | 4196 | /* add consumers devices */ |
9a8f5e07 | 4197 | if (init_data) { |
45389c47 | 4198 | mutex_lock(®ulator_list_mutex); |
9a8f5e07 MB |
4199 | for (i = 0; i < init_data->num_consumer_supplies; i++) { |
4200 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 4201 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 4202 | init_data->consumer_supplies[i].supply); |
9a8f5e07 | 4203 | if (ret < 0) { |
45389c47 | 4204 | mutex_unlock(®ulator_list_mutex); |
9a8f5e07 MB |
4205 | dev_err(dev, "Failed to set supply %s\n", |
4206 | init_data->consumer_supplies[i].supply); | |
4207 | goto unset_supplies; | |
4208 | } | |
23c2f041 | 4209 | } |
45389c47 | 4210 | mutex_unlock(®ulator_list_mutex); |
414c70cb | 4211 | } |
a5766f11 | 4212 | |
fd086045 MK |
4213 | if (!rdev->desc->ops->get_voltage && |
4214 | !rdev->desc->ops->list_voltage && | |
4215 | !rdev->desc->fixed_uV) | |
4216 | rdev->is_switch = true; | |
4217 | ||
c438b9d0 JH |
4218 | ret = device_register(&rdev->dev); |
4219 | if (ret != 0) { | |
4220 | put_device(&rdev->dev); | |
4221 | goto unset_supplies; | |
4222 | } | |
4223 | ||
4224 | dev_set_drvdata(&rdev->dev, rdev); | |
1130e5b3 | 4225 | rdev_init_debugfs(rdev); |
5e3ca2b3 JMC |
4226 | |
4227 | /* try to resolve regulators supply since a new one was registered */ | |
4228 | class_for_each_device(®ulator_class, NULL, NULL, | |
4229 | regulator_register_resolve_supply); | |
1b3de223 | 4230 | kfree(config); |
414c70cb | 4231 | return rdev; |
4fca9545 | 4232 | |
d4033b54 | 4233 | unset_supplies: |
45389c47 | 4234 | mutex_lock(®ulator_list_mutex); |
d4033b54 | 4235 | unset_regulator_supplies(rdev); |
45389c47 | 4236 | mutex_unlock(®ulator_list_mutex); |
32165230 | 4237 | wash: |
469b640e | 4238 | kfree(rdev->constraints); |
45389c47 | 4239 | mutex_lock(®ulator_list_mutex); |
32165230 | 4240 | regulator_ena_gpio_free(rdev); |
45389c47 | 4241 | mutex_unlock(®ulator_list_mutex); |
4fca9545 DB |
4242 | clean: |
4243 | kfree(rdev); | |
a2151374 JH |
4244 | kfree(config); |
4245 | return ERR_PTR(ret); | |
414c70cb LG |
4246 | } |
4247 | EXPORT_SYMBOL_GPL(regulator_register); | |
4248 | ||
4249 | /** | |
4250 | * regulator_unregister - unregister regulator | |
69279fb9 | 4251 | * @rdev: regulator to unregister |
414c70cb LG |
4252 | * |
4253 | * Called by regulator drivers to unregister a regulator. | |
4254 | */ | |
4255 | void regulator_unregister(struct regulator_dev *rdev) | |
4256 | { | |
4257 | if (rdev == NULL) | |
4258 | return; | |
4259 | ||
891636ea MB |
4260 | if (rdev->supply) { |
4261 | while (rdev->use_count--) | |
4262 | regulator_disable(rdev->supply); | |
e032b376 | 4263 | regulator_put(rdev->supply); |
891636ea | 4264 | } |
414c70cb | 4265 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 4266 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 4267 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 4268 | WARN_ON(rdev->open_count); |
0f1d747b | 4269 | unset_regulator_supplies(rdev); |
414c70cb | 4270 | list_del(&rdev->list); |
f19b00da | 4271 | regulator_ena_gpio_free(rdev); |
2c0a303a | 4272 | mutex_unlock(®ulator_list_mutex); |
58fb5cf5 | 4273 | device_unregister(&rdev->dev); |
414c70cb LG |
4274 | } |
4275 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
4276 | ||
f7efad10 CZ |
4277 | #ifdef CONFIG_SUSPEND |
4278 | static int _regulator_suspend_late(struct device *dev, void *data) | |
85f3b431 TV |
4279 | { |
4280 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
f7efad10 | 4281 | suspend_state_t *state = data; |
85f3b431 TV |
4282 | int ret; |
4283 | ||
4284 | mutex_lock(&rdev->mutex); | |
f7efad10 | 4285 | ret = suspend_set_state(rdev, *state); |
85f3b431 TV |
4286 | mutex_unlock(&rdev->mutex); |
4287 | ||
4288 | return ret; | |
4289 | } | |
4290 | ||
414c70cb | 4291 | /** |
f7efad10 | 4292 | * regulator_suspend_late - prepare regulators for system wide suspend |
414c70cb LG |
4293 | * @state: system suspend state |
4294 | * | |
4295 | * Configure each regulator with it's suspend operating parameters for state. | |
414c70cb | 4296 | */ |
f7efad10 | 4297 | static int regulator_suspend_late(struct device *dev) |
414c70cb | 4298 | { |
f7efad10 | 4299 | suspend_state_t state = pm_suspend_target_state; |
414c70cb | 4300 | |
85f3b431 | 4301 | return class_for_each_device(®ulator_class, NULL, &state, |
f7efad10 | 4302 | _regulator_suspend_late); |
85f3b431 | 4303 | } |
f7efad10 | 4304 | static int _regulator_resume_early(struct device *dev, void *data) |
85f3b431 | 4305 | { |
f7efad10 | 4306 | int ret = 0; |
85f3b431 | 4307 | struct regulator_dev *rdev = dev_to_rdev(dev); |
f7efad10 CZ |
4308 | suspend_state_t *state = data; |
4309 | struct regulator_state *rstate; | |
4310 | ||
4311 | rstate = regulator_get_suspend_state(rdev, *state); | |
4312 | if (rstate == NULL) | |
4313 | return -EINVAL; | |
414c70cb | 4314 | |
85f3b431 | 4315 | mutex_lock(&rdev->mutex); |
85f3b431 | 4316 | |
f7efad10 CZ |
4317 | if (rdev->desc->ops->resume_early && |
4318 | (rstate->enabled == ENABLE_IN_SUSPEND || | |
4319 | rstate->enabled == DISABLE_IN_SUSPEND)) | |
4320 | ret = rdev->desc->ops->resume_early(rdev); | |
4321 | ||
85f3b431 TV |
4322 | mutex_unlock(&rdev->mutex); |
4323 | ||
f7efad10 | 4324 | return ret; |
414c70cb | 4325 | } |
414c70cb | 4326 | |
f7efad10 | 4327 | static int regulator_resume_early(struct device *dev) |
7a32b589 | 4328 | { |
f7efad10 CZ |
4329 | suspend_state_t state = pm_suspend_target_state; |
4330 | ||
4331 | return class_for_each_device(®ulator_class, NULL, &state, | |
4332 | _regulator_resume_early); | |
7a32b589 | 4333 | } |
7a32b589 | 4334 | |
f7efad10 CZ |
4335 | #else /* !CONFIG_SUSPEND */ |
4336 | ||
4337 | #define regulator_suspend_late NULL | |
4338 | #define regulator_resume_early NULL | |
4339 | ||
4340 | #endif /* !CONFIG_SUSPEND */ | |
4341 | ||
4342 | #ifdef CONFIG_PM | |
4343 | static const struct dev_pm_ops __maybe_unused regulator_pm_ops = { | |
4344 | .suspend_late = regulator_suspend_late, | |
4345 | .resume_early = regulator_resume_early, | |
4346 | }; | |
4347 | #endif | |
4348 | ||
285c22de | 4349 | struct class regulator_class = { |
f7efad10 CZ |
4350 | .name = "regulator", |
4351 | .dev_release = regulator_dev_release, | |
4352 | .dev_groups = regulator_dev_groups, | |
4353 | #ifdef CONFIG_PM | |
4354 | .pm = ®ulator_pm_ops, | |
4355 | #endif | |
4356 | }; | |
ca725561 MB |
4357 | /** |
4358 | * regulator_has_full_constraints - the system has fully specified constraints | |
4359 | * | |
4360 | * Calling this function will cause the regulator API to disable all | |
4361 | * regulators which have a zero use count and don't have an always_on | |
4362 | * constraint in a late_initcall. | |
4363 | * | |
4364 | * The intention is that this will become the default behaviour in a | |
4365 | * future kernel release so users are encouraged to use this facility | |
4366 | * now. | |
4367 | */ | |
4368 | void regulator_has_full_constraints(void) | |
4369 | { | |
4370 | has_full_constraints = 1; | |
4371 | } | |
4372 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
4373 | ||
414c70cb LG |
4374 | /** |
4375 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 4376 | * @rdev: regulator |
414c70cb LG |
4377 | * |
4378 | * Get rdev regulator driver private data. This call can be used in the | |
4379 | * regulator driver context. | |
4380 | */ | |
4381 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
4382 | { | |
4383 | return rdev->reg_data; | |
4384 | } | |
4385 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
4386 | ||
4387 | /** | |
4388 | * regulator_get_drvdata - get regulator driver data | |
4389 | * @regulator: regulator | |
4390 | * | |
4391 | * Get regulator driver private data. This call can be used in the consumer | |
4392 | * driver context when non API regulator specific functions need to be called. | |
4393 | */ | |
4394 | void *regulator_get_drvdata(struct regulator *regulator) | |
4395 | { | |
4396 | return regulator->rdev->reg_data; | |
4397 | } | |
4398 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
4399 | ||
4400 | /** | |
4401 | * regulator_set_drvdata - set regulator driver data | |
4402 | * @regulator: regulator | |
4403 | * @data: data | |
4404 | */ | |
4405 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
4406 | { | |
4407 | regulator->rdev->reg_data = data; | |
4408 | } | |
4409 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
4410 | ||
4411 | /** | |
4412 | * regulator_get_id - get regulator ID | |
69279fb9 | 4413 | * @rdev: regulator |
414c70cb LG |
4414 | */ |
4415 | int rdev_get_id(struct regulator_dev *rdev) | |
4416 | { | |
4417 | return rdev->desc->id; | |
4418 | } | |
4419 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
4420 | ||
a5766f11 LG |
4421 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
4422 | { | |
4423 | return &rdev->dev; | |
4424 | } | |
4425 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
4426 | ||
4427 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
4428 | { | |
4429 | return reg_init_data->driver_data; | |
4430 | } | |
4431 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
4432 | ||
ba55a974 | 4433 | #ifdef CONFIG_DEBUG_FS |
dbc55955 | 4434 | static int supply_map_show(struct seq_file *sf, void *data) |
ba55a974 | 4435 | { |
ba55a974 MB |
4436 | struct regulator_map *map; |
4437 | ||
ba55a974 | 4438 | list_for_each_entry(map, ®ulator_map_list, list) { |
dbc55955 HZ |
4439 | seq_printf(sf, "%s -> %s.%s\n", |
4440 | rdev_get_name(map->regulator), map->dev_name, | |
4441 | map->supply); | |
ba55a974 MB |
4442 | } |
4443 | ||
dbc55955 HZ |
4444 | return 0; |
4445 | } | |
ba55a974 | 4446 | |
dbc55955 HZ |
4447 | static int supply_map_open(struct inode *inode, struct file *file) |
4448 | { | |
4449 | return single_open(file, supply_map_show, inode->i_private); | |
ba55a974 | 4450 | } |
24751434 | 4451 | #endif |
ba55a974 MB |
4452 | |
4453 | static const struct file_operations supply_map_fops = { | |
24751434 | 4454 | #ifdef CONFIG_DEBUG_FS |
dbc55955 HZ |
4455 | .open = supply_map_open, |
4456 | .read = seq_read, | |
4457 | .llseek = seq_lseek, | |
4458 | .release = single_release, | |
ba55a974 | 4459 | #endif |
24751434 | 4460 | }; |
ba55a974 | 4461 | |
7c225ec9 | 4462 | #ifdef CONFIG_DEBUG_FS |
85f3b431 TV |
4463 | struct summary_data { |
4464 | struct seq_file *s; | |
4465 | struct regulator_dev *parent; | |
4466 | int level; | |
4467 | }; | |
4468 | ||
4469 | static void regulator_summary_show_subtree(struct seq_file *s, | |
4470 | struct regulator_dev *rdev, | |
4471 | int level); | |
4472 | ||
4473 | static int regulator_summary_show_children(struct device *dev, void *data) | |
4474 | { | |
4475 | struct regulator_dev *rdev = dev_to_rdev(dev); | |
4476 | struct summary_data *summary_data = data; | |
4477 | ||
4478 | if (rdev->supply && rdev->supply->rdev == summary_data->parent) | |
4479 | regulator_summary_show_subtree(summary_data->s, rdev, | |
4480 | summary_data->level + 1); | |
4481 | ||
4482 | return 0; | |
4483 | } | |
4484 | ||
7c225ec9 HS |
4485 | static void regulator_summary_show_subtree(struct seq_file *s, |
4486 | struct regulator_dev *rdev, | |
4487 | int level) | |
4488 | { | |
7c225ec9 HS |
4489 | struct regulation_constraints *c; |
4490 | struct regulator *consumer; | |
85f3b431 | 4491 | struct summary_data summary_data; |
7c225ec9 HS |
4492 | |
4493 | if (!rdev) | |
4494 | return; | |
4495 | ||
7c225ec9 HS |
4496 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
4497 | level * 3 + 1, "", | |
4498 | 30 - level * 3, rdev_get_name(rdev), | |
4499 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
4500 | ||
23296099 HS |
4501 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
4502 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
4503 | |
4504 | c = rdev->constraints; | |
4505 | if (c) { | |
4506 | switch (rdev->desc->type) { | |
4507 | case REGULATOR_VOLTAGE: | |
4508 | seq_printf(s, "%5dmV %5dmV ", | |
4509 | c->min_uV / 1000, c->max_uV / 1000); | |
4510 | break; | |
4511 | case REGULATOR_CURRENT: | |
4512 | seq_printf(s, "%5dmA %5dmA ", | |
4513 | c->min_uA / 1000, c->max_uA / 1000); | |
4514 | break; | |
4515 | } | |
4516 | } | |
4517 | ||
4518 | seq_puts(s, "\n"); | |
4519 | ||
4520 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
e42a46b6 | 4521 | if (consumer->dev && consumer->dev->class == ®ulator_class) |
7c225ec9 HS |
4522 | continue; |
4523 | ||
4524 | seq_printf(s, "%*s%-*s ", | |
4525 | (level + 1) * 3 + 1, "", | |
e42a46b6 LC |
4526 | 30 - (level + 1) * 3, |
4527 | consumer->dev ? dev_name(consumer->dev) : "deviceless"); | |
7c225ec9 HS |
4528 | |
4529 | switch (rdev->desc->type) { | |
4530 | case REGULATOR_VOLTAGE: | |
23296099 | 4531 | seq_printf(s, "%37dmV %5dmV", |
c360a6df CZ |
4532 | consumer->voltage[PM_SUSPEND_ON].min_uV / 1000, |
4533 | consumer->voltage[PM_SUSPEND_ON].max_uV / 1000); | |
7c225ec9 HS |
4534 | break; |
4535 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4536 | break; |
4537 | } | |
4538 | ||
4539 | seq_puts(s, "\n"); | |
4540 | } | |
4541 | ||
85f3b431 TV |
4542 | summary_data.s = s; |
4543 | summary_data.level = level; | |
4544 | summary_data.parent = rdev; | |
7c225ec9 | 4545 | |
85f3b431 TV |
4546 | class_for_each_device(®ulator_class, NULL, &summary_data, |
4547 | regulator_summary_show_children); | |
7c225ec9 HS |
4548 | } |
4549 | ||
85f3b431 | 4550 | static int regulator_summary_show_roots(struct device *dev, void *data) |
7c225ec9 | 4551 | { |
85f3b431 TV |
4552 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4553 | struct seq_file *s = data; | |
7c225ec9 | 4554 | |
85f3b431 TV |
4555 | if (!rdev->supply) |
4556 | regulator_summary_show_subtree(s, rdev, 0); | |
7c225ec9 | 4557 | |
85f3b431 TV |
4558 | return 0; |
4559 | } | |
7c225ec9 | 4560 | |
85f3b431 TV |
4561 | static int regulator_summary_show(struct seq_file *s, void *data) |
4562 | { | |
4563 | seq_puts(s, " regulator use open bypass voltage current min max\n"); | |
4564 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 | 4565 | |
85f3b431 TV |
4566 | class_for_each_device(®ulator_class, NULL, s, |
4567 | regulator_summary_show_roots); | |
7c225ec9 HS |
4568 | |
4569 | return 0; | |
4570 | } | |
4571 | ||
4572 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4573 | { | |
4574 | return single_open(file, regulator_summary_show, inode->i_private); | |
4575 | } | |
4576 | #endif | |
4577 | ||
4578 | static const struct file_operations regulator_summary_fops = { | |
4579 | #ifdef CONFIG_DEBUG_FS | |
4580 | .open = regulator_summary_open, | |
4581 | .read = seq_read, | |
4582 | .llseek = seq_lseek, | |
4583 | .release = single_release, | |
4584 | #endif | |
4585 | }; | |
4586 | ||
414c70cb LG |
4587 | static int __init regulator_init(void) |
4588 | { | |
34abbd68 MB |
4589 | int ret; |
4590 | ||
34abbd68 MB |
4591 | ret = class_register(®ulator_class); |
4592 | ||
1130e5b3 | 4593 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4594 | if (!debugfs_root) |
1130e5b3 | 4595 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4596 | |
f4d562c6 MB |
4597 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4598 | &supply_map_fops); | |
1130e5b3 | 4599 | |
7c225ec9 | 4600 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
85f3b431 | 4601 | NULL, ®ulator_summary_fops); |
7c225ec9 | 4602 | |
34abbd68 MB |
4603 | regulator_dummy_init(); |
4604 | ||
4605 | return ret; | |
414c70cb LG |
4606 | } |
4607 | ||
4608 | /* init early to allow our consumers to complete system booting */ | |
4609 | core_initcall(regulator_init); | |
ca725561 | 4610 | |
609ca5f3 | 4611 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 4612 | { |
609ca5f3 MB |
4613 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4614 | const struct regulator_ops *ops = rdev->desc->ops; | |
4615 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 4616 | int enabled, ret; |
ca725561 | 4617 | |
609ca5f3 MB |
4618 | if (c && c->always_on) |
4619 | return 0; | |
4620 | ||
8a34e979 | 4621 | if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) |
609ca5f3 MB |
4622 | return 0; |
4623 | ||
4624 | mutex_lock(&rdev->mutex); | |
4625 | ||
4626 | if (rdev->use_count) | |
4627 | goto unlock; | |
4628 | ||
4629 | /* If we can't read the status assume it's on. */ | |
4630 | if (ops->is_enabled) | |
4631 | enabled = ops->is_enabled(rdev); | |
4632 | else | |
4633 | enabled = 1; | |
4634 | ||
4635 | if (!enabled) | |
4636 | goto unlock; | |
4637 | ||
4638 | if (have_full_constraints()) { | |
4639 | /* We log since this may kill the system if it goes | |
4640 | * wrong. */ | |
4641 | rdev_info(rdev, "disabling\n"); | |
4642 | ret = _regulator_do_disable(rdev); | |
4643 | if (ret != 0) | |
4644 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
4645 | } else { | |
4646 | /* The intention is that in future we will | |
4647 | * assume that full constraints are provided | |
4648 | * so warn even if we aren't going to do | |
4649 | * anything here. | |
4650 | */ | |
4651 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
4652 | } | |
4653 | ||
4654 | unlock: | |
4655 | mutex_unlock(&rdev->mutex); | |
4656 | ||
4657 | return 0; | |
4658 | } | |
4659 | ||
4660 | static int __init regulator_init_complete(void) | |
4661 | { | |
86f5fcfc MB |
4662 | /* |
4663 | * Since DT doesn't provide an idiomatic mechanism for | |
4664 | * enabling full constraints and since it's much more natural | |
4665 | * with DT to provide them just assume that a DT enabled | |
4666 | * system has full constraints. | |
4667 | */ | |
4668 | if (of_have_populated_dt()) | |
4669 | has_full_constraints = true; | |
4670 | ||
3827b64d JMC |
4671 | /* |
4672 | * Regulators may had failed to resolve their input supplies | |
4673 | * when were registered, either because the input supply was | |
4674 | * not registered yet or because its parent device was not | |
4675 | * bound yet. So attempt to resolve the input supplies for | |
4676 | * pending regulators before trying to disable unused ones. | |
4677 | */ | |
4678 | class_for_each_device(®ulator_class, NULL, NULL, | |
4679 | regulator_register_resolve_supply); | |
4680 | ||
ca725561 | 4681 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
4682 | * we have permission to change the status for and which are |
4683 | * not in use or always_on. This is effectively the default | |
4684 | * for DT and ACPI as they have full constraints. | |
ca725561 | 4685 | */ |
609ca5f3 MB |
4686 | class_for_each_device(®ulator_class, NULL, NULL, |
4687 | regulator_late_cleanup); | |
ca725561 MB |
4688 | |
4689 | return 0; | |
4690 | } | |
fd482a3e | 4691 | late_initcall_sync(regulator_init_complete); |