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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> |
69511a45 | 26 | #include <linux/of.h> |
65b19ce6 | 27 | #include <linux/regmap.h> |
69511a45 | 28 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
29 | #include <linux/regulator/consumer.h> |
30 | #include <linux/regulator/driver.h> | |
31 | #include <linux/regulator/machine.h> | |
65602c32 | 32 | #include <linux/module.h> |
414c70cb | 33 | |
02fa3ec0 MB |
34 | #define CREATE_TRACE_POINTS |
35 | #include <trace/events/regulator.h> | |
36 | ||
34abbd68 MB |
37 | #include "dummy.h" |
38 | ||
7d51a0db MB |
39 | #define rdev_crit(rdev, fmt, ...) \ |
40 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
41 | #define rdev_err(rdev, fmt, ...) \ |
42 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | #define rdev_warn(rdev, fmt, ...) \ | |
44 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | #define rdev_info(rdev, fmt, ...) \ | |
46 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
47 | #define rdev_dbg(rdev, fmt, ...) \ | |
48 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
49 | ||
414c70cb LG |
50 | static DEFINE_MUTEX(regulator_list_mutex); |
51 | static LIST_HEAD(regulator_list); | |
52 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 53 | static bool has_full_constraints; |
688fe99a | 54 | static bool board_wants_dummy_regulator; |
414c70cb | 55 | |
1130e5b3 | 56 | static struct dentry *debugfs_root; |
1130e5b3 | 57 | |
8dc5390d | 58 | /* |
414c70cb LG |
59 | * struct regulator_map |
60 | * | |
61 | * Used to provide symbolic supply names to devices. | |
62 | */ | |
63 | struct regulator_map { | |
64 | struct list_head list; | |
40f9244f | 65 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 66 | const char *supply; |
a5766f11 | 67 | struct regulator_dev *regulator; |
414c70cb LG |
68 | }; |
69 | ||
414c70cb LG |
70 | /* |
71 | * struct regulator | |
72 | * | |
73 | * One for each consumer device. | |
74 | */ | |
75 | struct regulator { | |
76 | struct device *dev; | |
77 | struct list_head list; | |
6492bc1b | 78 | unsigned int always_on:1; |
414c70cb LG |
79 | int uA_load; |
80 | int min_uV; | |
81 | int max_uV; | |
414c70cb LG |
82 | char *supply_name; |
83 | struct device_attribute dev_attr; | |
84 | struct regulator_dev *rdev; | |
5de70519 | 85 | struct dentry *debugfs; |
414c70cb LG |
86 | }; |
87 | ||
88 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 89 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
90 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
91 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
92 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
93 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
94 | unsigned long event, void *data); | |
75790251 MB |
95 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
96 | int min_uV, int max_uV); | |
3801b86a MB |
97 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
98 | struct device *dev, | |
99 | const char *supply_name); | |
414c70cb | 100 | |
1083c393 MB |
101 | static const char *rdev_get_name(struct regulator_dev *rdev) |
102 | { | |
103 | if (rdev->constraints && rdev->constraints->name) | |
104 | return rdev->constraints->name; | |
105 | else if (rdev->desc->name) | |
106 | return rdev->desc->name; | |
107 | else | |
108 | return ""; | |
109 | } | |
110 | ||
414c70cb LG |
111 | /* gets the regulator for a given consumer device */ |
112 | static struct regulator *get_device_regulator(struct device *dev) | |
113 | { | |
114 | struct regulator *regulator = NULL; | |
115 | struct regulator_dev *rdev; | |
116 | ||
117 | mutex_lock(®ulator_list_mutex); | |
118 | list_for_each_entry(rdev, ®ulator_list, list) { | |
119 | mutex_lock(&rdev->mutex); | |
120 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
121 | if (regulator->dev == dev) { | |
122 | mutex_unlock(&rdev->mutex); | |
123 | mutex_unlock(®ulator_list_mutex); | |
124 | return regulator; | |
125 | } | |
126 | } | |
127 | mutex_unlock(&rdev->mutex); | |
128 | } | |
129 | mutex_unlock(®ulator_list_mutex); | |
130 | return NULL; | |
131 | } | |
132 | ||
69511a45 RN |
133 | /** |
134 | * of_get_regulator - get a regulator device node based on supply name | |
135 | * @dev: Device pointer for the consumer (of regulator) device | |
136 | * @supply: regulator supply name | |
137 | * | |
138 | * Extract the regulator device node corresponding to the supply name. | |
139 | * retruns the device node corresponding to the regulator if found, else | |
140 | * returns NULL. | |
141 | */ | |
142 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
143 | { | |
144 | struct device_node *regnode = NULL; | |
145 | char prop_name[32]; /* 32 is max size of property name */ | |
146 | ||
147 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
148 | ||
149 | snprintf(prop_name, 32, "%s-supply", supply); | |
150 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
151 | ||
152 | if (!regnode) { | |
16fbcc3b | 153 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
154 | prop_name, dev->of_node->full_name); |
155 | return NULL; | |
156 | } | |
157 | return regnode; | |
158 | } | |
159 | ||
6492bc1b MB |
160 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
161 | { | |
162 | if (!rdev->constraints) | |
163 | return 0; | |
164 | ||
165 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
166 | return 1; | |
167 | else | |
168 | return 0; | |
169 | } | |
170 | ||
414c70cb LG |
171 | /* Platform voltage constraint check */ |
172 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
173 | int *min_uV, int *max_uV) | |
174 | { | |
175 | BUG_ON(*min_uV > *max_uV); | |
176 | ||
177 | if (!rdev->constraints) { | |
5da84fd9 | 178 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
179 | return -ENODEV; |
180 | } | |
181 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 182 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
183 | return -EPERM; |
184 | } | |
185 | ||
186 | if (*max_uV > rdev->constraints->max_uV) | |
187 | *max_uV = rdev->constraints->max_uV; | |
188 | if (*min_uV < rdev->constraints->min_uV) | |
189 | *min_uV = rdev->constraints->min_uV; | |
190 | ||
89f425ed MB |
191 | if (*min_uV > *max_uV) { |
192 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 193 | *min_uV, *max_uV); |
414c70cb | 194 | return -EINVAL; |
89f425ed | 195 | } |
414c70cb LG |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
05fda3b1 TP |
200 | /* Make sure we select a voltage that suits the needs of all |
201 | * regulator consumers | |
202 | */ | |
203 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
204 | int *min_uV, int *max_uV) | |
205 | { | |
206 | struct regulator *regulator; | |
207 | ||
208 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
209 | /* |
210 | * Assume consumers that didn't say anything are OK | |
211 | * with anything in the constraint range. | |
212 | */ | |
213 | if (!regulator->min_uV && !regulator->max_uV) | |
214 | continue; | |
215 | ||
05fda3b1 TP |
216 | if (*max_uV > regulator->max_uV) |
217 | *max_uV = regulator->max_uV; | |
218 | if (*min_uV < regulator->min_uV) | |
219 | *min_uV = regulator->min_uV; | |
220 | } | |
221 | ||
222 | if (*min_uV > *max_uV) | |
223 | return -EINVAL; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
414c70cb LG |
228 | /* current constraint check */ |
229 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
230 | int *min_uA, int *max_uA) | |
231 | { | |
232 | BUG_ON(*min_uA > *max_uA); | |
233 | ||
234 | if (!rdev->constraints) { | |
5da84fd9 | 235 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
236 | return -ENODEV; |
237 | } | |
238 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 239 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
240 | return -EPERM; |
241 | } | |
242 | ||
243 | if (*max_uA > rdev->constraints->max_uA) | |
244 | *max_uA = rdev->constraints->max_uA; | |
245 | if (*min_uA < rdev->constraints->min_uA) | |
246 | *min_uA = rdev->constraints->min_uA; | |
247 | ||
89f425ed MB |
248 | if (*min_uA > *max_uA) { |
249 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 250 | *min_uA, *max_uA); |
414c70cb | 251 | return -EINVAL; |
89f425ed | 252 | } |
414c70cb LG |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
257 | /* operating mode constraint check */ | |
2c608234 | 258 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 259 | { |
2c608234 | 260 | switch (*mode) { |
e573520b DB |
261 | case REGULATOR_MODE_FAST: |
262 | case REGULATOR_MODE_NORMAL: | |
263 | case REGULATOR_MODE_IDLE: | |
264 | case REGULATOR_MODE_STANDBY: | |
265 | break; | |
266 | default: | |
89f425ed | 267 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
268 | return -EINVAL; |
269 | } | |
270 | ||
414c70cb | 271 | if (!rdev->constraints) { |
5da84fd9 | 272 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
273 | return -ENODEV; |
274 | } | |
275 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 276 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
277 | return -EPERM; |
278 | } | |
2c608234 MB |
279 | |
280 | /* The modes are bitmasks, the most power hungry modes having | |
281 | * the lowest values. If the requested mode isn't supported | |
282 | * try higher modes. */ | |
283 | while (*mode) { | |
284 | if (rdev->constraints->valid_modes_mask & *mode) | |
285 | return 0; | |
286 | *mode /= 2; | |
414c70cb | 287 | } |
2c608234 MB |
288 | |
289 | return -EINVAL; | |
414c70cb LG |
290 | } |
291 | ||
292 | /* dynamic regulator mode switching constraint check */ | |
293 | static int regulator_check_drms(struct regulator_dev *rdev) | |
294 | { | |
295 | if (!rdev->constraints) { | |
5da84fd9 | 296 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
297 | return -ENODEV; |
298 | } | |
299 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 300 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
301 | return -EPERM; |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static ssize_t device_requested_uA_show(struct device *dev, | |
307 | struct device_attribute *attr, char *buf) | |
308 | { | |
309 | struct regulator *regulator; | |
310 | ||
311 | regulator = get_device_regulator(dev); | |
312 | if (regulator == NULL) | |
313 | return 0; | |
314 | ||
315 | return sprintf(buf, "%d\n", regulator->uA_load); | |
316 | } | |
317 | ||
318 | static ssize_t regulator_uV_show(struct device *dev, | |
319 | struct device_attribute *attr, char *buf) | |
320 | { | |
a5766f11 | 321 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
322 | ssize_t ret; |
323 | ||
324 | mutex_lock(&rdev->mutex); | |
325 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
326 | mutex_unlock(&rdev->mutex); | |
327 | ||
328 | return ret; | |
329 | } | |
7ad68e2f | 330 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
331 | |
332 | static ssize_t regulator_uA_show(struct device *dev, | |
333 | struct device_attribute *attr, char *buf) | |
334 | { | |
a5766f11 | 335 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
336 | |
337 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
338 | } | |
7ad68e2f | 339 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 340 | |
bc558a60 MB |
341 | static ssize_t regulator_name_show(struct device *dev, |
342 | struct device_attribute *attr, char *buf) | |
343 | { | |
344 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 345 | |
1083c393 | 346 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
347 | } |
348 | ||
4fca9545 | 349 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 350 | { |
414c70cb LG |
351 | switch (mode) { |
352 | case REGULATOR_MODE_FAST: | |
353 | return sprintf(buf, "fast\n"); | |
354 | case REGULATOR_MODE_NORMAL: | |
355 | return sprintf(buf, "normal\n"); | |
356 | case REGULATOR_MODE_IDLE: | |
357 | return sprintf(buf, "idle\n"); | |
358 | case REGULATOR_MODE_STANDBY: | |
359 | return sprintf(buf, "standby\n"); | |
360 | } | |
361 | return sprintf(buf, "unknown\n"); | |
362 | } | |
363 | ||
4fca9545 DB |
364 | static ssize_t regulator_opmode_show(struct device *dev, |
365 | struct device_attribute *attr, char *buf) | |
414c70cb | 366 | { |
a5766f11 | 367 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 368 | |
4fca9545 DB |
369 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
370 | } | |
7ad68e2f | 371 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
372 | |
373 | static ssize_t regulator_print_state(char *buf, int state) | |
374 | { | |
414c70cb LG |
375 | if (state > 0) |
376 | return sprintf(buf, "enabled\n"); | |
377 | else if (state == 0) | |
378 | return sprintf(buf, "disabled\n"); | |
379 | else | |
380 | return sprintf(buf, "unknown\n"); | |
381 | } | |
382 | ||
4fca9545 DB |
383 | static ssize_t regulator_state_show(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
387 | ssize_t ret; |
388 | ||
389 | mutex_lock(&rdev->mutex); | |
390 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
391 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 392 | |
9332546f | 393 | return ret; |
4fca9545 | 394 | } |
7ad68e2f | 395 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 396 | |
853116a1 DB |
397 | static ssize_t regulator_status_show(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
399 | { | |
400 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
401 | int status; | |
402 | char *label; | |
403 | ||
404 | status = rdev->desc->ops->get_status(rdev); | |
405 | if (status < 0) | |
406 | return status; | |
407 | ||
408 | switch (status) { | |
409 | case REGULATOR_STATUS_OFF: | |
410 | label = "off"; | |
411 | break; | |
412 | case REGULATOR_STATUS_ON: | |
413 | label = "on"; | |
414 | break; | |
415 | case REGULATOR_STATUS_ERROR: | |
416 | label = "error"; | |
417 | break; | |
418 | case REGULATOR_STATUS_FAST: | |
419 | label = "fast"; | |
420 | break; | |
421 | case REGULATOR_STATUS_NORMAL: | |
422 | label = "normal"; | |
423 | break; | |
424 | case REGULATOR_STATUS_IDLE: | |
425 | label = "idle"; | |
426 | break; | |
427 | case REGULATOR_STATUS_STANDBY: | |
428 | label = "standby"; | |
429 | break; | |
430 | default: | |
431 | return -ERANGE; | |
432 | } | |
433 | ||
434 | return sprintf(buf, "%s\n", label); | |
435 | } | |
436 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
437 | ||
414c70cb LG |
438 | static ssize_t regulator_min_uA_show(struct device *dev, |
439 | struct device_attribute *attr, char *buf) | |
440 | { | |
a5766f11 | 441 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
442 | |
443 | if (!rdev->constraints) | |
444 | return sprintf(buf, "constraint not defined\n"); | |
445 | ||
446 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
447 | } | |
7ad68e2f | 448 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
449 | |
450 | static ssize_t regulator_max_uA_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
454 | |
455 | if (!rdev->constraints) | |
456 | return sprintf(buf, "constraint not defined\n"); | |
457 | ||
458 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
459 | } | |
7ad68e2f | 460 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
461 | |
462 | static ssize_t regulator_min_uV_show(struct device *dev, | |
463 | struct device_attribute *attr, char *buf) | |
464 | { | |
a5766f11 | 465 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
466 | |
467 | if (!rdev->constraints) | |
468 | return sprintf(buf, "constraint not defined\n"); | |
469 | ||
470 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
471 | } | |
7ad68e2f | 472 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
473 | |
474 | static ssize_t regulator_max_uV_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->max_uV); | |
483 | } | |
7ad68e2f | 484 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
485 | |
486 | static ssize_t regulator_total_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 | struct regulator *regulator; |
491 | int uA = 0; | |
492 | ||
493 | mutex_lock(&rdev->mutex); | |
494 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 495 | uA += regulator->uA_load; |
414c70cb LG |
496 | mutex_unlock(&rdev->mutex); |
497 | return sprintf(buf, "%d\n", uA); | |
498 | } | |
7ad68e2f | 499 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
500 | |
501 | static ssize_t regulator_num_users_show(struct device *dev, | |
502 | struct device_attribute *attr, char *buf) | |
503 | { | |
a5766f11 | 504 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
505 | return sprintf(buf, "%d\n", rdev->use_count); |
506 | } | |
507 | ||
508 | static ssize_t regulator_type_show(struct device *dev, | |
509 | struct device_attribute *attr, char *buf) | |
510 | { | |
a5766f11 | 511 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
512 | |
513 | switch (rdev->desc->type) { | |
514 | case REGULATOR_VOLTAGE: | |
515 | return sprintf(buf, "voltage\n"); | |
516 | case REGULATOR_CURRENT: | |
517 | return sprintf(buf, "current\n"); | |
518 | } | |
519 | return sprintf(buf, "unknown\n"); | |
520 | } | |
521 | ||
522 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
523 | struct device_attribute *attr, char *buf) | |
524 | { | |
a5766f11 | 525 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 526 | |
414c70cb LG |
527 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
528 | } | |
7ad68e2f DB |
529 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
530 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
531 | |
532 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
533 | struct device_attribute *attr, char *buf) | |
534 | { | |
a5766f11 | 535 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 536 | |
414c70cb LG |
537 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
538 | } | |
7ad68e2f DB |
539 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
540 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
541 | |
542 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
543 | struct device_attribute *attr, char *buf) | |
544 | { | |
a5766f11 | 545 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 546 | |
414c70cb LG |
547 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
548 | } | |
7ad68e2f DB |
549 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
550 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 551 | |
414c70cb LG |
552 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
553 | struct device_attribute *attr, char *buf) | |
554 | { | |
a5766f11 | 555 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 556 | |
4fca9545 DB |
557 | return regulator_print_opmode(buf, |
558 | rdev->constraints->state_mem.mode); | |
414c70cb | 559 | } |
7ad68e2f DB |
560 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
561 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
562 | |
563 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
a5766f11 | 566 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 567 | |
4fca9545 DB |
568 | return regulator_print_opmode(buf, |
569 | rdev->constraints->state_disk.mode); | |
414c70cb | 570 | } |
7ad68e2f DB |
571 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
572 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
573 | |
574 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
575 | struct device_attribute *attr, char *buf) | |
576 | { | |
a5766f11 | 577 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 578 | |
4fca9545 DB |
579 | return regulator_print_opmode(buf, |
580 | rdev->constraints->state_standby.mode); | |
414c70cb | 581 | } |
7ad68e2f DB |
582 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
583 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
584 | |
585 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
586 | struct device_attribute *attr, char *buf) | |
587 | { | |
a5766f11 | 588 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 589 | |
4fca9545 DB |
590 | return regulator_print_state(buf, |
591 | rdev->constraints->state_mem.enabled); | |
414c70cb | 592 | } |
7ad68e2f DB |
593 | static DEVICE_ATTR(suspend_mem_state, 0444, |
594 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
595 | |
596 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
597 | struct device_attribute *attr, char *buf) | |
598 | { | |
a5766f11 | 599 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 600 | |
4fca9545 DB |
601 | return regulator_print_state(buf, |
602 | rdev->constraints->state_disk.enabled); | |
414c70cb | 603 | } |
7ad68e2f DB |
604 | static DEVICE_ATTR(suspend_disk_state, 0444, |
605 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
606 | |
607 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
608 | struct device_attribute *attr, char *buf) | |
609 | { | |
a5766f11 | 610 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 611 | |
4fca9545 DB |
612 | return regulator_print_state(buf, |
613 | rdev->constraints->state_standby.enabled); | |
414c70cb | 614 | } |
7ad68e2f DB |
615 | static DEVICE_ATTR(suspend_standby_state, 0444, |
616 | regulator_suspend_standby_state_show, NULL); | |
617 | ||
bc558a60 | 618 | |
7ad68e2f DB |
619 | /* |
620 | * These are the only attributes are present for all regulators. | |
621 | * Other attributes are a function of regulator functionality. | |
622 | */ | |
414c70cb | 623 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 624 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
625 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
626 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
627 | __ATTR_NULL, |
628 | }; | |
629 | ||
630 | static void regulator_dev_release(struct device *dev) | |
631 | { | |
a5766f11 | 632 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
633 | kfree(rdev); |
634 | } | |
635 | ||
636 | static struct class regulator_class = { | |
637 | .name = "regulator", | |
638 | .dev_release = regulator_dev_release, | |
639 | .dev_attrs = regulator_dev_attrs, | |
640 | }; | |
641 | ||
642 | /* Calculate the new optimum regulator operating mode based on the new total | |
643 | * consumer load. All locks held by caller */ | |
644 | static void drms_uA_update(struct regulator_dev *rdev) | |
645 | { | |
646 | struct regulator *sibling; | |
647 | int current_uA = 0, output_uV, input_uV, err; | |
648 | unsigned int mode; | |
649 | ||
650 | err = regulator_check_drms(rdev); | |
651 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
652 | (!rdev->desc->ops->get_voltage && |
653 | !rdev->desc->ops->get_voltage_sel) || | |
654 | !rdev->desc->ops->set_mode) | |
036de8ef | 655 | return; |
414c70cb LG |
656 | |
657 | /* get output voltage */ | |
1bf5a1f8 | 658 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
659 | if (output_uV <= 0) |
660 | return; | |
661 | ||
662 | /* get input voltage */ | |
1bf5a1f8 MB |
663 | input_uV = 0; |
664 | if (rdev->supply) | |
3f24f5ad | 665 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 666 | if (input_uV <= 0) |
414c70cb LG |
667 | input_uV = rdev->constraints->input_uV; |
668 | if (input_uV <= 0) | |
669 | return; | |
670 | ||
671 | /* calc total requested load */ | |
672 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 673 | current_uA += sibling->uA_load; |
414c70cb LG |
674 | |
675 | /* now get the optimum mode for our new total regulator load */ | |
676 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
677 | output_uV, current_uA); | |
678 | ||
679 | /* check the new mode is allowed */ | |
2c608234 | 680 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
681 | if (err == 0) |
682 | rdev->desc->ops->set_mode(rdev, mode); | |
683 | } | |
684 | ||
685 | static int suspend_set_state(struct regulator_dev *rdev, | |
686 | struct regulator_state *rstate) | |
687 | { | |
688 | int ret = 0; | |
638f85c5 MB |
689 | |
690 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
691 | * only warn if the driver implements set_suspend_voltage or |
692 | * set_suspend_mode callback. | |
638f85c5 MB |
693 | */ |
694 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
695 | if (rdev->desc->ops->set_suspend_voltage || |
696 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 697 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
698 | return 0; |
699 | } | |
700 | ||
701 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 702 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
703 | return -EINVAL; |
704 | } | |
414c70cb | 705 | |
8ac0e95d | 706 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 707 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 708 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 709 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
710 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
711 | ret = 0; | |
712 | ||
414c70cb | 713 | if (ret < 0) { |
5da84fd9 | 714 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
715 | return ret; |
716 | } | |
717 | ||
718 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
719 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
720 | if (ret < 0) { | |
5da84fd9 | 721 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
722 | return ret; |
723 | } | |
724 | } | |
725 | ||
726 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
727 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
728 | if (ret < 0) { | |
5da84fd9 | 729 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
730 | return ret; |
731 | } | |
732 | } | |
733 | return ret; | |
734 | } | |
735 | ||
736 | /* locks held by caller */ | |
737 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
738 | { | |
739 | if (!rdev->constraints) | |
740 | return -EINVAL; | |
741 | ||
742 | switch (state) { | |
743 | case PM_SUSPEND_STANDBY: | |
744 | return suspend_set_state(rdev, | |
745 | &rdev->constraints->state_standby); | |
746 | case PM_SUSPEND_MEM: | |
747 | return suspend_set_state(rdev, | |
748 | &rdev->constraints->state_mem); | |
749 | case PM_SUSPEND_MAX: | |
750 | return suspend_set_state(rdev, | |
751 | &rdev->constraints->state_disk); | |
752 | default: | |
753 | return -EINVAL; | |
754 | } | |
755 | } | |
756 | ||
757 | static void print_constraints(struct regulator_dev *rdev) | |
758 | { | |
759 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 760 | char buf[80] = ""; |
8f031b48 MB |
761 | int count = 0; |
762 | int ret; | |
414c70cb | 763 | |
8f031b48 | 764 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 765 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
766 | count += sprintf(buf + count, "%d mV ", |
767 | constraints->min_uV / 1000); | |
414c70cb | 768 | else |
8f031b48 MB |
769 | count += sprintf(buf + count, "%d <--> %d mV ", |
770 | constraints->min_uV / 1000, | |
771 | constraints->max_uV / 1000); | |
772 | } | |
773 | ||
774 | if (!constraints->min_uV || | |
775 | constraints->min_uV != constraints->max_uV) { | |
776 | ret = _regulator_get_voltage(rdev); | |
777 | if (ret > 0) | |
778 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
779 | } | |
780 | ||
bf5892a8 MB |
781 | if (constraints->uV_offset) |
782 | count += sprintf(buf, "%dmV offset ", | |
783 | constraints->uV_offset / 1000); | |
784 | ||
8f031b48 | 785 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 786 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
787 | count += sprintf(buf + count, "%d mA ", |
788 | constraints->min_uA / 1000); | |
414c70cb | 789 | else |
8f031b48 MB |
790 | count += sprintf(buf + count, "%d <--> %d mA ", |
791 | constraints->min_uA / 1000, | |
792 | constraints->max_uA / 1000); | |
793 | } | |
794 | ||
795 | if (!constraints->min_uA || | |
796 | constraints->min_uA != constraints->max_uA) { | |
797 | ret = _regulator_get_current_limit(rdev); | |
798 | if (ret > 0) | |
e4a6376b | 799 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 800 | } |
8f031b48 | 801 | |
414c70cb LG |
802 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
803 | count += sprintf(buf + count, "fast "); | |
804 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
805 | count += sprintf(buf + count, "normal "); | |
806 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
807 | count += sprintf(buf + count, "idle "); | |
808 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
809 | count += sprintf(buf + count, "standby"); | |
810 | ||
13ce29f8 | 811 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
812 | |
813 | if ((constraints->min_uV != constraints->max_uV) && | |
814 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
815 | rdev_warn(rdev, | |
816 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
817 | } |
818 | ||
e79055d6 | 819 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 820 | struct regulation_constraints *constraints) |
a5766f11 | 821 | { |
e5fda26c | 822 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
823 | int ret; |
824 | ||
825 | /* do we need to apply the constraint voltage */ | |
826 | if (rdev->constraints->apply_uV && | |
75790251 MB |
827 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
828 | ret = _regulator_do_set_voltage(rdev, | |
829 | rdev->constraints->min_uV, | |
830 | rdev->constraints->max_uV); | |
831 | if (ret < 0) { | |
832 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
833 | rdev->constraints->min_uV); | |
75790251 MB |
834 | return ret; |
835 | } | |
af5866c9 | 836 | } |
e06f5b4f | 837 | |
4367cfdc DB |
838 | /* constrain machine-level voltage specs to fit |
839 | * the actual range supported by this regulator. | |
840 | */ | |
841 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
842 | int count = rdev->desc->n_voltages; | |
843 | int i; | |
844 | int min_uV = INT_MAX; | |
845 | int max_uV = INT_MIN; | |
846 | int cmin = constraints->min_uV; | |
847 | int cmax = constraints->max_uV; | |
848 | ||
3e590918 MB |
849 | /* it's safe to autoconfigure fixed-voltage supplies |
850 | and the constraints are used by list_voltage. */ | |
4367cfdc | 851 | if (count == 1 && !cmin) { |
3e590918 | 852 | cmin = 1; |
4367cfdc | 853 | cmax = INT_MAX; |
3e590918 MB |
854 | constraints->min_uV = cmin; |
855 | constraints->max_uV = cmax; | |
4367cfdc DB |
856 | } |
857 | ||
3e2b9abd MB |
858 | /* voltage constraints are optional */ |
859 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 860 | return 0; |
3e2b9abd | 861 | |
4367cfdc | 862 | /* else require explicit machine-level constraints */ |
3e2b9abd | 863 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 864 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 865 | return -EINVAL; |
4367cfdc DB |
866 | } |
867 | ||
868 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
869 | for (i = 0; i < count; i++) { | |
870 | int value; | |
871 | ||
872 | value = ops->list_voltage(rdev, i); | |
873 | if (value <= 0) | |
874 | continue; | |
875 | ||
876 | /* maybe adjust [min_uV..max_uV] */ | |
877 | if (value >= cmin && value < min_uV) | |
878 | min_uV = value; | |
879 | if (value <= cmax && value > max_uV) | |
880 | max_uV = value; | |
881 | } | |
882 | ||
883 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
884 | if (max_uV < min_uV) { | |
5da84fd9 | 885 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 886 | return -EINVAL; |
4367cfdc DB |
887 | } |
888 | ||
889 | /* use regulator's subset of machine constraints */ | |
890 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
891 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
892 | constraints->min_uV, min_uV); | |
4367cfdc DB |
893 | constraints->min_uV = min_uV; |
894 | } | |
895 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
896 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
897 | constraints->max_uV, max_uV); | |
4367cfdc DB |
898 | constraints->max_uV = max_uV; |
899 | } | |
900 | } | |
901 | ||
e79055d6 MB |
902 | return 0; |
903 | } | |
904 | ||
905 | /** | |
906 | * set_machine_constraints - sets regulator constraints | |
907 | * @rdev: regulator source | |
908 | * @constraints: constraints to apply | |
909 | * | |
910 | * Allows platform initialisation code to define and constrain | |
911 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
912 | * Constraints *must* be set by platform code in order for some | |
913 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
914 | * set_mode. | |
915 | */ | |
916 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 917 | const struct regulation_constraints *constraints) |
e79055d6 MB |
918 | { |
919 | int ret = 0; | |
e79055d6 MB |
920 | struct regulator_ops *ops = rdev->desc->ops; |
921 | ||
9a8f5e07 MB |
922 | if (constraints) |
923 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
924 | GFP_KERNEL); | |
925 | else | |
926 | rdev->constraints = kzalloc(sizeof(*constraints), | |
927 | GFP_KERNEL); | |
f8c12fe3 MB |
928 | if (!rdev->constraints) |
929 | return -ENOMEM; | |
af5866c9 | 930 | |
f8c12fe3 | 931 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
932 | if (ret != 0) |
933 | goto out; | |
934 | ||
a5766f11 | 935 | /* do we need to setup our suspend state */ |
9a8f5e07 | 936 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 937 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 938 | if (ret < 0) { |
5da84fd9 | 939 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
940 | goto out; |
941 | } | |
942 | } | |
a5766f11 | 943 | |
9a8f5e07 | 944 | if (rdev->constraints->initial_mode) { |
a308466c | 945 | if (!ops->set_mode) { |
5da84fd9 | 946 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
947 | ret = -EINVAL; |
948 | goto out; | |
949 | } | |
950 | ||
f8c12fe3 | 951 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 952 | if (ret < 0) { |
5da84fd9 | 953 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
954 | goto out; |
955 | } | |
956 | } | |
957 | ||
cacf90f2 MB |
958 | /* If the constraints say the regulator should be on at this point |
959 | * and we have control then make sure it is enabled. | |
960 | */ | |
f8c12fe3 MB |
961 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
962 | ops->enable) { | |
e5fda26c MB |
963 | ret = ops->enable(rdev); |
964 | if (ret < 0) { | |
5da84fd9 | 965 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
966 | goto out; |
967 | } | |
968 | } | |
969 | ||
6f0b2c69 YSB |
970 | if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { |
971 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); | |
972 | if (ret < 0) { | |
973 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
974 | goto out; | |
975 | } | |
976 | } | |
977 | ||
a5766f11 | 978 | print_constraints(rdev); |
1a6958e7 | 979 | return 0; |
a5766f11 | 980 | out: |
1a6958e7 AL |
981 | kfree(rdev->constraints); |
982 | rdev->constraints = NULL; | |
a5766f11 LG |
983 | return ret; |
984 | } | |
985 | ||
986 | /** | |
987 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
988 | * @rdev: regulator name |
989 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
990 | * |
991 | * Called by platform initialisation code to set the supply regulator for this | |
992 | * regulator. This ensures that a regulators supply will also be enabled by the | |
993 | * core if it's child is enabled. | |
994 | */ | |
995 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 996 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
997 | { |
998 | int err; | |
999 | ||
3801b86a MB |
1000 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1001 | ||
1002 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1003 | if (rdev->supply == NULL) { |
1004 | err = -ENOMEM; | |
3801b86a | 1005 | return err; |
a5766f11 | 1006 | } |
3801b86a MB |
1007 | |
1008 | return 0; | |
a5766f11 LG |
1009 | } |
1010 | ||
1011 | /** | |
06c63f93 | 1012 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1013 | * @rdev: regulator source |
40f9244f | 1014 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1015 | * @supply: symbolic name for supply |
a5766f11 LG |
1016 | * |
1017 | * Allows platform initialisation code to map physical regulator | |
1018 | * sources to symbolic names for supplies for use by devices. Devices | |
1019 | * should use these symbolic names to request regulators, avoiding the | |
1020 | * need to provide board-specific regulator names as platform data. | |
1021 | */ | |
1022 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1023 | const char *consumer_dev_name, |
1024 | const char *supply) | |
a5766f11 LG |
1025 | { |
1026 | struct regulator_map *node; | |
9ed2099e | 1027 | int has_dev; |
a5766f11 LG |
1028 | |
1029 | if (supply == NULL) | |
1030 | return -EINVAL; | |
1031 | ||
9ed2099e MB |
1032 | if (consumer_dev_name != NULL) |
1033 | has_dev = 1; | |
1034 | else | |
1035 | has_dev = 0; | |
1036 | ||
6001e13c | 1037 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1038 | if (node->dev_name && consumer_dev_name) { |
1039 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1040 | continue; | |
1041 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1042 | continue; |
23b5cc2a JN |
1043 | } |
1044 | ||
6001e13c DB |
1045 | if (strcmp(node->supply, supply) != 0) |
1046 | continue; | |
1047 | ||
737f360d MB |
1048 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1049 | consumer_dev_name, | |
1050 | dev_name(&node->regulator->dev), | |
1051 | node->regulator->desc->name, | |
1052 | supply, | |
1053 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1054 | return -EBUSY; |
1055 | } | |
1056 | ||
9ed2099e | 1057 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1058 | if (node == NULL) |
1059 | return -ENOMEM; | |
1060 | ||
1061 | node->regulator = rdev; | |
a5766f11 LG |
1062 | node->supply = supply; |
1063 | ||
9ed2099e MB |
1064 | if (has_dev) { |
1065 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1066 | if (node->dev_name == NULL) { | |
1067 | kfree(node); | |
1068 | return -ENOMEM; | |
1069 | } | |
40f9244f MB |
1070 | } |
1071 | ||
a5766f11 LG |
1072 | list_add(&node->list, ®ulator_map_list); |
1073 | return 0; | |
1074 | } | |
1075 | ||
0f1d747b MR |
1076 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1077 | { | |
1078 | struct regulator_map *node, *n; | |
1079 | ||
1080 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1081 | if (rdev == node->regulator) { | |
1082 | list_del(&node->list); | |
40f9244f | 1083 | kfree(node->dev_name); |
0f1d747b | 1084 | kfree(node); |
0f1d747b MR |
1085 | } |
1086 | } | |
1087 | } | |
1088 | ||
f5726ae3 | 1089 | #define REG_STR_SIZE 64 |
414c70cb LG |
1090 | |
1091 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1092 | struct device *dev, | |
1093 | const char *supply_name) | |
1094 | { | |
1095 | struct regulator *regulator; | |
1096 | char buf[REG_STR_SIZE]; | |
1097 | int err, size; | |
1098 | ||
1099 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1100 | if (regulator == NULL) | |
1101 | return NULL; | |
1102 | ||
1103 | mutex_lock(&rdev->mutex); | |
1104 | regulator->rdev = rdev; | |
1105 | list_add(®ulator->list, &rdev->consumer_list); | |
1106 | ||
1107 | if (dev) { | |
1108 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1109 | size = scnprintf(buf, REG_STR_SIZE, |
1110 | "microamps_requested_%s-%s", | |
1111 | dev_name(dev), supply_name); | |
414c70cb LG |
1112 | if (size >= REG_STR_SIZE) |
1113 | goto overflow_err; | |
1114 | ||
1115 | regulator->dev = dev; | |
4f26a2ab | 1116 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1117 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1118 | if (regulator->dev_attr.attr.name == NULL) | |
1119 | goto attr_name_err; | |
1120 | ||
414c70cb LG |
1121 | regulator->dev_attr.attr.mode = 0444; |
1122 | regulator->dev_attr.show = device_requested_uA_show; | |
1123 | err = device_create_file(dev, ®ulator->dev_attr); | |
1124 | if (err < 0) { | |
5da84fd9 | 1125 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1126 | goto attr_name_err; |
1127 | } | |
1128 | ||
1129 | /* also add a link to the device sysfs entry */ | |
1130 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1131 | dev->kobj.name, supply_name); | |
1132 | if (size >= REG_STR_SIZE) | |
1133 | goto attr_err; | |
1134 | ||
1135 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1136 | if (regulator->supply_name == NULL) | |
1137 | goto attr_err; | |
1138 | ||
1139 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1140 | buf); | |
1141 | if (err) { | |
5da84fd9 JP |
1142 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1143 | dev->kobj.name, err); | |
414c70cb LG |
1144 | goto link_name_err; |
1145 | } | |
5de70519 MB |
1146 | } else { |
1147 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1148 | if (regulator->supply_name == NULL) | |
1149 | goto attr_err; | |
1150 | } | |
1151 | ||
5de70519 MB |
1152 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1153 | rdev->debugfs); | |
24751434 | 1154 | if (!regulator->debugfs) { |
5de70519 | 1155 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1156 | } else { |
1157 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1158 | ®ulator->uA_load); | |
1159 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1160 | ®ulator->min_uV); | |
1161 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1162 | ®ulator->max_uV); | |
414c70cb | 1163 | } |
5de70519 | 1164 | |
6492bc1b MB |
1165 | /* |
1166 | * Check now if the regulator is an always on regulator - if | |
1167 | * it is then we don't need to do nearly so much work for | |
1168 | * enable/disable calls. | |
1169 | */ | |
1170 | if (!_regulator_can_change_status(rdev) && | |
1171 | _regulator_is_enabled(rdev)) | |
1172 | regulator->always_on = true; | |
1173 | ||
414c70cb LG |
1174 | mutex_unlock(&rdev->mutex); |
1175 | return regulator; | |
1176 | link_name_err: | |
1177 | kfree(regulator->supply_name); | |
1178 | attr_err: | |
1179 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1180 | attr_name_err: | |
1181 | kfree(regulator->dev_attr.attr.name); | |
1182 | overflow_err: | |
1183 | list_del(®ulator->list); | |
1184 | kfree(regulator); | |
1185 | mutex_unlock(&rdev->mutex); | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
31aae2be MB |
1189 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1190 | { | |
1191 | if (!rdev->desc->ops->enable_time) | |
79511ed3 | 1192 | return rdev->desc->enable_time; |
31aae2be MB |
1193 | return rdev->desc->ops->enable_time(rdev); |
1194 | } | |
1195 | ||
69511a45 | 1196 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1197 | const char *supply, |
1198 | int *ret) | |
69511a45 RN |
1199 | { |
1200 | struct regulator_dev *r; | |
1201 | struct device_node *node; | |
576ca436 MB |
1202 | struct regulator_map *map; |
1203 | const char *devname = NULL; | |
69511a45 RN |
1204 | |
1205 | /* first do a dt based lookup */ | |
1206 | if (dev && dev->of_node) { | |
1207 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1208 | if (node) { |
69511a45 RN |
1209 | list_for_each_entry(r, ®ulator_list, list) |
1210 | if (r->dev.parent && | |
1211 | node == r->dev.of_node) | |
1212 | return r; | |
6d191a5f MB |
1213 | } else { |
1214 | /* | |
1215 | * If we couldn't even get the node then it's | |
1216 | * not just that the device didn't register | |
1217 | * yet, there's no node and we'll never | |
1218 | * succeed. | |
1219 | */ | |
1220 | *ret = -ENODEV; | |
1221 | } | |
69511a45 RN |
1222 | } |
1223 | ||
1224 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1225 | if (dev) |
1226 | devname = dev_name(dev); | |
1227 | ||
69511a45 RN |
1228 | list_for_each_entry(r, ®ulator_list, list) |
1229 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1230 | return r; | |
1231 | ||
576ca436 MB |
1232 | list_for_each_entry(map, ®ulator_map_list, list) { |
1233 | /* If the mapping has a device set up it must match */ | |
1234 | if (map->dev_name && | |
1235 | (!devname || strcmp(map->dev_name, devname))) | |
1236 | continue; | |
1237 | ||
1238 | if (strcmp(map->supply, supply) == 0) | |
1239 | return map->regulator; | |
1240 | } | |
1241 | ||
1242 | ||
69511a45 RN |
1243 | return NULL; |
1244 | } | |
1245 | ||
5ffbd136 MB |
1246 | /* Internal regulator request function */ |
1247 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1248 | int exclusive) | |
414c70cb LG |
1249 | { |
1250 | struct regulator_dev *rdev; | |
04bf3011 | 1251 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1252 | const char *devname = NULL; |
5ffbd136 | 1253 | int ret; |
414c70cb LG |
1254 | |
1255 | if (id == NULL) { | |
5da84fd9 | 1256 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1257 | return regulator; |
1258 | } | |
1259 | ||
40f9244f MB |
1260 | if (dev) |
1261 | devname = dev_name(dev); | |
1262 | ||
414c70cb LG |
1263 | mutex_lock(®ulator_list_mutex); |
1264 | ||
6d191a5f | 1265 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1266 | if (rdev) |
1267 | goto found; | |
1268 | ||
688fe99a MB |
1269 | if (board_wants_dummy_regulator) { |
1270 | rdev = dummy_regulator_rdev; | |
1271 | goto found; | |
1272 | } | |
1273 | ||
34abbd68 MB |
1274 | #ifdef CONFIG_REGULATOR_DUMMY |
1275 | if (!devname) | |
1276 | devname = "deviceless"; | |
1277 | ||
1278 | /* If the board didn't flag that it was fully constrained then | |
1279 | * substitute in a dummy regulator so consumers can continue. | |
1280 | */ | |
1281 | if (!has_full_constraints) { | |
5da84fd9 JP |
1282 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1283 | devname, id); | |
34abbd68 MB |
1284 | rdev = dummy_regulator_rdev; |
1285 | goto found; | |
1286 | } | |
1287 | #endif | |
1288 | ||
414c70cb LG |
1289 | mutex_unlock(®ulator_list_mutex); |
1290 | return regulator; | |
1291 | ||
1292 | found: | |
5ffbd136 MB |
1293 | if (rdev->exclusive) { |
1294 | regulator = ERR_PTR(-EPERM); | |
1295 | goto out; | |
1296 | } | |
1297 | ||
1298 | if (exclusive && rdev->open_count) { | |
1299 | regulator = ERR_PTR(-EBUSY); | |
1300 | goto out; | |
1301 | } | |
1302 | ||
a5766f11 LG |
1303 | if (!try_module_get(rdev->owner)) |
1304 | goto out; | |
1305 | ||
414c70cb LG |
1306 | regulator = create_regulator(rdev, dev, id); |
1307 | if (regulator == NULL) { | |
1308 | regulator = ERR_PTR(-ENOMEM); | |
1309 | module_put(rdev->owner); | |
bcda4321 | 1310 | goto out; |
414c70cb LG |
1311 | } |
1312 | ||
5ffbd136 MB |
1313 | rdev->open_count++; |
1314 | if (exclusive) { | |
1315 | rdev->exclusive = 1; | |
1316 | ||
1317 | ret = _regulator_is_enabled(rdev); | |
1318 | if (ret > 0) | |
1319 | rdev->use_count = 1; | |
1320 | else | |
1321 | rdev->use_count = 0; | |
1322 | } | |
1323 | ||
a5766f11 | 1324 | out: |
414c70cb | 1325 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1326 | |
414c70cb LG |
1327 | return regulator; |
1328 | } | |
5ffbd136 MB |
1329 | |
1330 | /** | |
1331 | * regulator_get - lookup and obtain a reference to a regulator. | |
1332 | * @dev: device for regulator "consumer" | |
1333 | * @id: Supply name or regulator ID. | |
1334 | * | |
1335 | * Returns a struct regulator corresponding to the regulator producer, | |
1336 | * or IS_ERR() condition containing errno. | |
1337 | * | |
1338 | * Use of supply names configured via regulator_set_device_supply() is | |
1339 | * strongly encouraged. It is recommended that the supply name used | |
1340 | * should match the name used for the supply and/or the relevant | |
1341 | * device pins in the datasheet. | |
1342 | */ | |
1343 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1344 | { | |
1345 | return _regulator_get(dev, id, 0); | |
1346 | } | |
414c70cb LG |
1347 | EXPORT_SYMBOL_GPL(regulator_get); |
1348 | ||
070b9079 SB |
1349 | static void devm_regulator_release(struct device *dev, void *res) |
1350 | { | |
1351 | regulator_put(*(struct regulator **)res); | |
1352 | } | |
1353 | ||
1354 | /** | |
1355 | * devm_regulator_get - Resource managed regulator_get() | |
1356 | * @dev: device for regulator "consumer" | |
1357 | * @id: Supply name or regulator ID. | |
1358 | * | |
1359 | * Managed regulator_get(). Regulators returned from this function are | |
1360 | * automatically regulator_put() on driver detach. See regulator_get() for more | |
1361 | * information. | |
1362 | */ | |
1363 | struct regulator *devm_regulator_get(struct device *dev, const char *id) | |
1364 | { | |
1365 | struct regulator **ptr, *regulator; | |
1366 | ||
1367 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1368 | if (!ptr) | |
1369 | return ERR_PTR(-ENOMEM); | |
1370 | ||
1371 | regulator = regulator_get(dev, id); | |
1372 | if (!IS_ERR(regulator)) { | |
1373 | *ptr = regulator; | |
1374 | devres_add(dev, ptr); | |
1375 | } else { | |
1376 | devres_free(ptr); | |
1377 | } | |
1378 | ||
1379 | return regulator; | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(devm_regulator_get); | |
1382 | ||
5ffbd136 MB |
1383 | /** |
1384 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1385 | * @dev: device for regulator "consumer" | |
1386 | * @id: Supply name or regulator ID. | |
1387 | * | |
1388 | * Returns a struct regulator corresponding to the regulator producer, | |
1389 | * or IS_ERR() condition containing errno. Other consumers will be | |
1390 | * unable to obtain this reference is held and the use count for the | |
1391 | * regulator will be initialised to reflect the current state of the | |
1392 | * regulator. | |
1393 | * | |
1394 | * This is intended for use by consumers which cannot tolerate shared | |
1395 | * use of the regulator such as those which need to force the | |
1396 | * regulator off for correct operation of the hardware they are | |
1397 | * controlling. | |
1398 | * | |
1399 | * Use of supply names configured via regulator_set_device_supply() is | |
1400 | * strongly encouraged. It is recommended that the supply name used | |
1401 | * should match the name used for the supply and/or the relevant | |
1402 | * device pins in the datasheet. | |
1403 | */ | |
1404 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1405 | { | |
1406 | return _regulator_get(dev, id, 1); | |
1407 | } | |
1408 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1409 | ||
414c70cb LG |
1410 | /** |
1411 | * regulator_put - "free" the regulator source | |
1412 | * @regulator: regulator source | |
1413 | * | |
1414 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1415 | * regulator source are balanced by regulator_disable calls prior to calling | |
1416 | * this function. | |
1417 | */ | |
1418 | void regulator_put(struct regulator *regulator) | |
1419 | { | |
1420 | struct regulator_dev *rdev; | |
1421 | ||
1422 | if (regulator == NULL || IS_ERR(regulator)) | |
1423 | return; | |
1424 | ||
414c70cb LG |
1425 | mutex_lock(®ulator_list_mutex); |
1426 | rdev = regulator->rdev; | |
1427 | ||
5de70519 | 1428 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1429 | |
414c70cb LG |
1430 | /* remove any sysfs entries */ |
1431 | if (regulator->dev) { | |
1432 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
414c70cb LG |
1433 | device_remove_file(regulator->dev, ®ulator->dev_attr); |
1434 | kfree(regulator->dev_attr.attr.name); | |
1435 | } | |
5de70519 | 1436 | kfree(regulator->supply_name); |
414c70cb LG |
1437 | list_del(®ulator->list); |
1438 | kfree(regulator); | |
1439 | ||
5ffbd136 MB |
1440 | rdev->open_count--; |
1441 | rdev->exclusive = 0; | |
1442 | ||
414c70cb LG |
1443 | module_put(rdev->owner); |
1444 | mutex_unlock(®ulator_list_mutex); | |
1445 | } | |
1446 | EXPORT_SYMBOL_GPL(regulator_put); | |
1447 | ||
d5ad34f7 MB |
1448 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1449 | { | |
1450 | struct regulator **r = res; | |
1451 | if (!r || !*r) { | |
1452 | WARN_ON(!r || !*r); | |
1453 | return 0; | |
1454 | } | |
1455 | return *r == data; | |
1456 | } | |
1457 | ||
1458 | /** | |
1459 | * devm_regulator_put - Resource managed regulator_put() | |
1460 | * @regulator: regulator to free | |
1461 | * | |
1462 | * Deallocate a regulator allocated with devm_regulator_get(). Normally | |
1463 | * this function will not need to be called and the resource management | |
1464 | * code will ensure that the resource is freed. | |
1465 | */ | |
1466 | void devm_regulator_put(struct regulator *regulator) | |
1467 | { | |
1468 | int rc; | |
1469 | ||
361ff501 | 1470 | rc = devres_release(regulator->dev, devm_regulator_release, |
d5ad34f7 | 1471 | devm_regulator_match, regulator); |
968c2c17 MB |
1472 | if (rc == 0) |
1473 | regulator_put(regulator); | |
1474 | else | |
1475 | WARN_ON(rc); | |
d5ad34f7 MB |
1476 | } |
1477 | EXPORT_SYMBOL_GPL(devm_regulator_put); | |
1478 | ||
5c5659d0 MB |
1479 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1480 | { | |
1481 | int ret, delay; | |
1482 | ||
1483 | /* Query before enabling in case configuration dependent. */ | |
1484 | ret = _regulator_get_enable_time(rdev); | |
1485 | if (ret >= 0) { | |
1486 | delay = ret; | |
1487 | } else { | |
1488 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1489 | delay = 0; | |
1490 | } | |
1491 | ||
1492 | trace_regulator_enable(rdev_get_name(rdev)); | |
1493 | ||
1494 | if (rdev->desc->ops->enable) { | |
1495 | ret = rdev->desc->ops->enable(rdev); | |
1496 | if (ret < 0) | |
1497 | return ret; | |
1498 | } else { | |
1499 | return -EINVAL; | |
1500 | } | |
1501 | ||
1502 | /* Allow the regulator to ramp; it would be useful to extend | |
1503 | * this for bulk operations so that the regulators can ramp | |
1504 | * together. */ | |
1505 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1506 | ||
1507 | if (delay >= 1000) { | |
1508 | mdelay(delay / 1000); | |
1509 | udelay(delay % 1000); | |
1510 | } else if (delay) { | |
1511 | udelay(delay); | |
1512 | } | |
1513 | ||
1514 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
414c70cb LG |
1519 | /* locks held by regulator_enable() */ |
1520 | static int _regulator_enable(struct regulator_dev *rdev) | |
1521 | { | |
5c5659d0 | 1522 | int ret; |
414c70cb | 1523 | |
414c70cb | 1524 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1525 | if (rdev->constraints && |
1526 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1527 | drms_uA_update(rdev); | |
414c70cb | 1528 | |
9a2372fa MB |
1529 | if (rdev->use_count == 0) { |
1530 | /* The regulator may on if it's not switchable or left on */ | |
1531 | ret = _regulator_is_enabled(rdev); | |
1532 | if (ret == -EINVAL || ret == 0) { | |
1533 | if (!_regulator_can_change_status(rdev)) | |
1534 | return -EPERM; | |
1535 | ||
5c5659d0 | 1536 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1537 | if (ret < 0) |
1538 | return ret; | |
1539 | ||
a7433cff | 1540 | } else if (ret < 0) { |
5da84fd9 | 1541 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1542 | return ret; |
1543 | } | |
a7433cff | 1544 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1545 | } |
1546 | ||
9a2372fa MB |
1547 | rdev->use_count++; |
1548 | ||
1549 | return 0; | |
414c70cb LG |
1550 | } |
1551 | ||
1552 | /** | |
1553 | * regulator_enable - enable regulator output | |
1554 | * @regulator: regulator source | |
1555 | * | |
cf7bbcdf MB |
1556 | * Request that the regulator be enabled with the regulator output at |
1557 | * the predefined voltage or current value. Calls to regulator_enable() | |
1558 | * must be balanced with calls to regulator_disable(). | |
1559 | * | |
414c70cb | 1560 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1561 | * hardwired in the regulator. |
414c70cb LG |
1562 | */ |
1563 | int regulator_enable(struct regulator *regulator) | |
1564 | { | |
412aec61 DB |
1565 | struct regulator_dev *rdev = regulator->rdev; |
1566 | int ret = 0; | |
414c70cb | 1567 | |
6492bc1b MB |
1568 | if (regulator->always_on) |
1569 | return 0; | |
1570 | ||
3801b86a MB |
1571 | if (rdev->supply) { |
1572 | ret = regulator_enable(rdev->supply); | |
1573 | if (ret != 0) | |
1574 | return ret; | |
1575 | } | |
1576 | ||
412aec61 | 1577 | mutex_lock(&rdev->mutex); |
cd94b505 | 1578 | ret = _regulator_enable(rdev); |
412aec61 | 1579 | mutex_unlock(&rdev->mutex); |
3801b86a | 1580 | |
d1685e4e | 1581 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1582 | regulator_disable(rdev->supply); |
1583 | ||
414c70cb LG |
1584 | return ret; |
1585 | } | |
1586 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1587 | ||
5c5659d0 MB |
1588 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1589 | { | |
1590 | int ret; | |
1591 | ||
1592 | trace_regulator_disable(rdev_get_name(rdev)); | |
1593 | ||
1594 | if (rdev->ena_gpio) { | |
1595 | gpio_set_value_cansleep(rdev->ena_gpio, | |
1596 | rdev->ena_gpio_invert); | |
1597 | rdev->ena_gpio_state = 0; | |
1598 | ||
1599 | } else if (rdev->desc->ops->disable) { | |
1600 | ret = rdev->desc->ops->disable(rdev); | |
1601 | if (ret != 0) | |
1602 | return ret; | |
1603 | } | |
1604 | ||
1605 | trace_regulator_disable_complete(rdev_get_name(rdev)); | |
1606 | ||
1607 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1608 | NULL); | |
1609 | return 0; | |
1610 | } | |
1611 | ||
414c70cb | 1612 | /* locks held by regulator_disable() */ |
3801b86a | 1613 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1614 | { |
1615 | int ret = 0; | |
1616 | ||
cd94b505 | 1617 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1618 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1619 | return -EIO; |
1620 | ||
414c70cb | 1621 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1622 | if (rdev->use_count == 1 && |
1623 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1624 | |
1625 | /* we are last user */ | |
5c5659d0 MB |
1626 | if (_regulator_can_change_status(rdev)) { |
1627 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1628 | if (ret < 0) { |
5da84fd9 | 1629 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1630 | return ret; |
1631 | } | |
1632 | } | |
1633 | ||
414c70cb LG |
1634 | rdev->use_count = 0; |
1635 | } else if (rdev->use_count > 1) { | |
1636 | ||
1637 | if (rdev->constraints && | |
1638 | (rdev->constraints->valid_ops_mask & | |
1639 | REGULATOR_CHANGE_DRMS)) | |
1640 | drms_uA_update(rdev); | |
1641 | ||
1642 | rdev->use_count--; | |
1643 | } | |
3801b86a | 1644 | |
414c70cb LG |
1645 | return ret; |
1646 | } | |
1647 | ||
1648 | /** | |
1649 | * regulator_disable - disable regulator output | |
1650 | * @regulator: regulator source | |
1651 | * | |
cf7bbcdf MB |
1652 | * Disable the regulator output voltage or current. Calls to |
1653 | * regulator_enable() must be balanced with calls to | |
1654 | * regulator_disable(). | |
69279fb9 | 1655 | * |
414c70cb | 1656 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1657 | * devices have it enabled, the regulator device supports disabling and |
1658 | * machine constraints permit this operation. | |
414c70cb LG |
1659 | */ |
1660 | int regulator_disable(struct regulator *regulator) | |
1661 | { | |
412aec61 DB |
1662 | struct regulator_dev *rdev = regulator->rdev; |
1663 | int ret = 0; | |
414c70cb | 1664 | |
6492bc1b MB |
1665 | if (regulator->always_on) |
1666 | return 0; | |
1667 | ||
412aec61 | 1668 | mutex_lock(&rdev->mutex); |
3801b86a | 1669 | ret = _regulator_disable(rdev); |
412aec61 | 1670 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1671 | |
3801b86a MB |
1672 | if (ret == 0 && rdev->supply) |
1673 | regulator_disable(rdev->supply); | |
8cbf811d | 1674 | |
414c70cb LG |
1675 | return ret; |
1676 | } | |
1677 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1678 | ||
1679 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1680 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1681 | { |
1682 | int ret = 0; | |
1683 | ||
1684 | /* force disable */ | |
1685 | if (rdev->desc->ops->disable) { | |
1686 | /* ah well, who wants to live forever... */ | |
1687 | ret = rdev->desc->ops->disable(rdev); | |
1688 | if (ret < 0) { | |
5da84fd9 | 1689 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1690 | return ret; |
1691 | } | |
1692 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1693 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1694 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1695 | } |
1696 | ||
414c70cb LG |
1697 | return ret; |
1698 | } | |
1699 | ||
1700 | /** | |
1701 | * regulator_force_disable - force disable regulator output | |
1702 | * @regulator: regulator source | |
1703 | * | |
1704 | * Forcibly disable the regulator output voltage or current. | |
1705 | * NOTE: this *will* disable the regulator output even if other consumer | |
1706 | * devices have it enabled. This should be used for situations when device | |
1707 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1708 | */ | |
1709 | int regulator_force_disable(struct regulator *regulator) | |
1710 | { | |
82d15839 | 1711 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1712 | int ret; |
1713 | ||
82d15839 | 1714 | mutex_lock(&rdev->mutex); |
414c70cb | 1715 | regulator->uA_load = 0; |
3801b86a | 1716 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1717 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1718 | |
3801b86a MB |
1719 | if (rdev->supply) |
1720 | while (rdev->open_count--) | |
1721 | regulator_disable(rdev->supply); | |
8cbf811d | 1722 | |
414c70cb LG |
1723 | return ret; |
1724 | } | |
1725 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1726 | ||
da07ecd9 MB |
1727 | static void regulator_disable_work(struct work_struct *work) |
1728 | { | |
1729 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1730 | disable_work.work); | |
1731 | int count, i, ret; | |
1732 | ||
1733 | mutex_lock(&rdev->mutex); | |
1734 | ||
1735 | BUG_ON(!rdev->deferred_disables); | |
1736 | ||
1737 | count = rdev->deferred_disables; | |
1738 | rdev->deferred_disables = 0; | |
1739 | ||
1740 | for (i = 0; i < count; i++) { | |
1741 | ret = _regulator_disable(rdev); | |
1742 | if (ret != 0) | |
1743 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1744 | } | |
1745 | ||
1746 | mutex_unlock(&rdev->mutex); | |
1747 | ||
1748 | if (rdev->supply) { | |
1749 | for (i = 0; i < count; i++) { | |
1750 | ret = regulator_disable(rdev->supply); | |
1751 | if (ret != 0) { | |
1752 | rdev_err(rdev, | |
1753 | "Supply disable failed: %d\n", ret); | |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | } | |
1758 | ||
1759 | /** | |
1760 | * regulator_disable_deferred - disable regulator output with delay | |
1761 | * @regulator: regulator source | |
1762 | * @ms: miliseconds until the regulator is disabled | |
1763 | * | |
1764 | * Execute regulator_disable() on the regulator after a delay. This | |
1765 | * is intended for use with devices that require some time to quiesce. | |
1766 | * | |
1767 | * NOTE: this will only disable the regulator output if no other consumer | |
1768 | * devices have it enabled, the regulator device supports disabling and | |
1769 | * machine constraints permit this operation. | |
1770 | */ | |
1771 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1772 | { | |
1773 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1774 | int ret; |
da07ecd9 | 1775 | |
6492bc1b MB |
1776 | if (regulator->always_on) |
1777 | return 0; | |
1778 | ||
da07ecd9 MB |
1779 | mutex_lock(&rdev->mutex); |
1780 | rdev->deferred_disables++; | |
1781 | mutex_unlock(&rdev->mutex); | |
1782 | ||
aa59802d MB |
1783 | ret = schedule_delayed_work(&rdev->disable_work, |
1784 | msecs_to_jiffies(ms)); | |
1785 | if (ret < 0) | |
1786 | return ret; | |
1787 | else | |
1788 | return 0; | |
da07ecd9 MB |
1789 | } |
1790 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1791 | ||
cd6dffb4 MB |
1792 | /** |
1793 | * regulator_is_enabled_regmap - standard is_enabled() for regmap users | |
1794 | * | |
1795 | * @rdev: regulator to operate on | |
1796 | * | |
1797 | * Regulators that use regmap for their register I/O can set the | |
1798 | * enable_reg and enable_mask fields in their descriptor and then use | |
1799 | * this as their is_enabled operation, saving some code. | |
1800 | */ | |
1801 | int regulator_is_enabled_regmap(struct regulator_dev *rdev) | |
1802 | { | |
1803 | unsigned int val; | |
1804 | int ret; | |
1805 | ||
1806 | ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); | |
1807 | if (ret != 0) | |
1808 | return ret; | |
1809 | ||
1810 | return (val & rdev->desc->enable_mask) != 0; | |
1811 | } | |
1812 | EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); | |
1813 | ||
1814 | /** | |
1815 | * regulator_enable_regmap - standard enable() for regmap users | |
1816 | * | |
1817 | * @rdev: regulator to operate on | |
1818 | * | |
1819 | * Regulators that use regmap for their register I/O can set the | |
1820 | * enable_reg and enable_mask fields in their descriptor and then use | |
1821 | * this as their enable() operation, saving some code. | |
1822 | */ | |
1823 | int regulator_enable_regmap(struct regulator_dev *rdev) | |
1824 | { | |
1825 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1826 | rdev->desc->enable_mask, | |
1827 | rdev->desc->enable_mask); | |
1828 | } | |
1829 | EXPORT_SYMBOL_GPL(regulator_enable_regmap); | |
1830 | ||
1831 | /** | |
1832 | * regulator_disable_regmap - standard disable() for regmap users | |
1833 | * | |
1834 | * @rdev: regulator to operate on | |
1835 | * | |
1836 | * Regulators that use regmap for their register I/O can set the | |
1837 | * enable_reg and enable_mask fields in their descriptor and then use | |
1838 | * this as their disable() operation, saving some code. | |
1839 | */ | |
1840 | int regulator_disable_regmap(struct regulator_dev *rdev) | |
1841 | { | |
1842 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
1843 | rdev->desc->enable_mask, 0); | |
1844 | } | |
1845 | EXPORT_SYMBOL_GPL(regulator_disable_regmap); | |
1846 | ||
414c70cb LG |
1847 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1848 | { | |
9a7f6a4c | 1849 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1850 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1851 | return 1; |
414c70cb | 1852 | |
9332546f | 1853 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1854 | } |
1855 | ||
1856 | /** | |
1857 | * regulator_is_enabled - is the regulator output enabled | |
1858 | * @regulator: regulator source | |
1859 | * | |
412aec61 DB |
1860 | * Returns positive if the regulator driver backing the source/client |
1861 | * has requested that the device be enabled, zero if it hasn't, else a | |
1862 | * negative errno code. | |
1863 | * | |
1864 | * Note that the device backing this regulator handle can have multiple | |
1865 | * users, so it might be enabled even if regulator_enable() was never | |
1866 | * called for this particular source. | |
414c70cb LG |
1867 | */ |
1868 | int regulator_is_enabled(struct regulator *regulator) | |
1869 | { | |
9332546f MB |
1870 | int ret; |
1871 | ||
6492bc1b MB |
1872 | if (regulator->always_on) |
1873 | return 1; | |
1874 | ||
9332546f MB |
1875 | mutex_lock(®ulator->rdev->mutex); |
1876 | ret = _regulator_is_enabled(regulator->rdev); | |
1877 | mutex_unlock(®ulator->rdev->mutex); | |
1878 | ||
1879 | return ret; | |
414c70cb LG |
1880 | } |
1881 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1882 | ||
4367cfdc DB |
1883 | /** |
1884 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1885 | * @regulator: regulator source | |
1886 | * | |
1887 | * Returns number of selectors, or negative errno. Selectors are | |
1888 | * numbered starting at zero, and typically correspond to bitfields | |
1889 | * in hardware registers. | |
1890 | */ | |
1891 | int regulator_count_voltages(struct regulator *regulator) | |
1892 | { | |
1893 | struct regulator_dev *rdev = regulator->rdev; | |
1894 | ||
1895 | return rdev->desc->n_voltages ? : -EINVAL; | |
1896 | } | |
1897 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1898 | ||
bca7bbff MB |
1899 | /** |
1900 | * regulator_list_voltage_linear - List voltages with simple calculation | |
1901 | * | |
1902 | * @rdev: Regulator device | |
1903 | * @selector: Selector to convert into a voltage | |
1904 | * | |
1905 | * Regulators with a simple linear mapping between voltages and | |
1906 | * selectors can set min_uV and uV_step in the regulator descriptor | |
1907 | * and then use this function as their list_voltage() operation, | |
1908 | */ | |
1909 | int regulator_list_voltage_linear(struct regulator_dev *rdev, | |
1910 | unsigned int selector) | |
1911 | { | |
1912 | if (selector >= rdev->desc->n_voltages) | |
1913 | return -EINVAL; | |
1914 | ||
1915 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); | |
1916 | } | |
1917 | EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); | |
1918 | ||
cffc9592 AL |
1919 | /** |
1920 | * regulator_list_voltage_table - List voltages with table based mapping | |
1921 | * | |
1922 | * @rdev: Regulator device | |
1923 | * @selector: Selector to convert into a voltage | |
1924 | * | |
1925 | * Regulators with table based mapping between voltages and | |
1926 | * selectors can set volt_table in the regulator descriptor | |
1927 | * and then use this function as their list_voltage() operation. | |
1928 | */ | |
1929 | int regulator_list_voltage_table(struct regulator_dev *rdev, | |
1930 | unsigned int selector) | |
1931 | { | |
1932 | if (!rdev->desc->volt_table) { | |
1933 | BUG_ON(!rdev->desc->volt_table); | |
1934 | return -EINVAL; | |
1935 | } | |
1936 | ||
1937 | if (selector >= rdev->desc->n_voltages) | |
1938 | return -EINVAL; | |
1939 | ||
1940 | return rdev->desc->volt_table[selector]; | |
1941 | } | |
1942 | EXPORT_SYMBOL_GPL(regulator_list_voltage_table); | |
1943 | ||
4367cfdc DB |
1944 | /** |
1945 | * regulator_list_voltage - enumerate supported voltages | |
1946 | * @regulator: regulator source | |
1947 | * @selector: identify voltage to list | |
1948 | * Context: can sleep | |
1949 | * | |
1950 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1951 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1952 | * negative errno. |
1953 | */ | |
1954 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1955 | { | |
1956 | struct regulator_dev *rdev = regulator->rdev; | |
1957 | struct regulator_ops *ops = rdev->desc->ops; | |
1958 | int ret; | |
1959 | ||
1960 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1961 | return -EINVAL; | |
1962 | ||
1963 | mutex_lock(&rdev->mutex); | |
1964 | ret = ops->list_voltage(rdev, selector); | |
1965 | mutex_unlock(&rdev->mutex); | |
1966 | ||
1967 | if (ret > 0) { | |
1968 | if (ret < rdev->constraints->min_uV) | |
1969 | ret = 0; | |
1970 | else if (ret > rdev->constraints->max_uV) | |
1971 | ret = 0; | |
1972 | } | |
1973 | ||
1974 | return ret; | |
1975 | } | |
1976 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1977 | ||
a7a1ad90 MB |
1978 | /** |
1979 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1980 | * | |
1981 | * @regulator: Regulator to check. | |
1982 | * @min_uV: Minimum required voltage in uV. | |
1983 | * @max_uV: Maximum required voltage in uV. | |
1984 | * | |
1985 | * Returns a boolean or a negative error code. | |
1986 | */ | |
1987 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1988 | int min_uV, int max_uV) | |
1989 | { | |
1990 | int i, voltages, ret; | |
1991 | ||
1992 | ret = regulator_count_voltages(regulator); | |
1993 | if (ret < 0) | |
1994 | return ret; | |
1995 | voltages = ret; | |
1996 | ||
1997 | for (i = 0; i < voltages; i++) { | |
1998 | ret = regulator_list_voltage(regulator, i); | |
1999 | ||
2000 | if (ret >= min_uV && ret <= max_uV) | |
2001 | return 1; | |
2002 | } | |
2003 | ||
2004 | return 0; | |
2005 | } | |
a398eaa2 | 2006 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2007 | |
4ab5b3d9 MB |
2008 | /** |
2009 | * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users | |
2010 | * | |
2011 | * @rdev: regulator to operate on | |
2012 | * | |
2013 | * Regulators that use regmap for their register I/O can set the | |
2014 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
2015 | * as their get_voltage_vsel operation, saving some code. | |
2016 | */ | |
2017 | int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) | |
2018 | { | |
2019 | unsigned int val; | |
2020 | int ret; | |
2021 | ||
2022 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
2023 | if (ret != 0) | |
2024 | return ret; | |
2025 | ||
2026 | val &= rdev->desc->vsel_mask; | |
2027 | val >>= ffs(rdev->desc->vsel_mask) - 1; | |
2028 | ||
2029 | return val; | |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); | |
2032 | ||
2033 | /** | |
2034 | * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users | |
2035 | * | |
2036 | * @rdev: regulator to operate on | |
2037 | * @sel: Selector to set | |
2038 | * | |
2039 | * Regulators that use regmap for their register I/O can set the | |
2040 | * vsel_reg and vsel_mask fields in their descriptor and then use this | |
2041 | * as their set_voltage_vsel operation, saving some code. | |
2042 | */ | |
2043 | int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) | |
2044 | { | |
2045 | sel <<= ffs(rdev->desc->vsel_mask) - 1; | |
2046 | ||
2047 | return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, | |
2048 | rdev->desc->vsel_mask, sel); | |
2049 | } | |
2050 | EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); | |
2051 | ||
e843fc46 MB |
2052 | /** |
2053 | * regulator_map_voltage_iterate - map_voltage() based on list_voltage() | |
2054 | * | |
2055 | * @rdev: Regulator to operate on | |
2056 | * @min_uV: Lower bound for voltage | |
2057 | * @max_uV: Upper bound for voltage | |
2058 | * | |
2059 | * Drivers implementing set_voltage_sel() and list_voltage() can use | |
2060 | * this as their map_voltage() operation. It will find a suitable | |
2061 | * voltage by calling list_voltage() until it gets something in bounds | |
2062 | * for the requested voltages. | |
2063 | */ | |
2064 | int regulator_map_voltage_iterate(struct regulator_dev *rdev, | |
2065 | int min_uV, int max_uV) | |
2066 | { | |
2067 | int best_val = INT_MAX; | |
2068 | int selector = 0; | |
2069 | int i, ret; | |
2070 | ||
2071 | /* Find the smallest voltage that falls within the specified | |
2072 | * range. | |
2073 | */ | |
2074 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2075 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
2076 | if (ret < 0) | |
2077 | continue; | |
2078 | ||
2079 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
2080 | best_val = ret; | |
2081 | selector = i; | |
2082 | } | |
2083 | } | |
2084 | ||
2085 | if (best_val != INT_MAX) | |
2086 | return selector; | |
2087 | else | |
2088 | return -EINVAL; | |
2089 | } | |
2090 | EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); | |
2091 | ||
bca7bbff MB |
2092 | /** |
2093 | * regulator_map_voltage_linear - map_voltage() for simple linear mappings | |
2094 | * | |
2095 | * @rdev: Regulator to operate on | |
2096 | * @min_uV: Lower bound for voltage | |
2097 | * @max_uV: Upper bound for voltage | |
2098 | * | |
2099 | * Drivers providing min_uV and uV_step in their regulator_desc can | |
2100 | * use this as their map_voltage() operation. | |
2101 | */ | |
2102 | int regulator_map_voltage_linear(struct regulator_dev *rdev, | |
2103 | int min_uV, int max_uV) | |
2104 | { | |
2105 | int ret, voltage; | |
2106 | ||
5a6881e8 AL |
2107 | /* Allow uV_step to be 0 for fixed voltage */ |
2108 | if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { | |
2109 | if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) | |
2110 | return 0; | |
2111 | else | |
2112 | return -EINVAL; | |
2113 | } | |
2114 | ||
bca7bbff MB |
2115 | if (!rdev->desc->uV_step) { |
2116 | BUG_ON(!rdev->desc->uV_step); | |
2117 | return -EINVAL; | |
2118 | } | |
2119 | ||
0bdc81e4 AL |
2120 | if (min_uV < rdev->desc->min_uV) |
2121 | min_uV = rdev->desc->min_uV; | |
2122 | ||
ccfcb1c3 | 2123 | ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
bca7bbff MB |
2124 | if (ret < 0) |
2125 | return ret; | |
2126 | ||
2127 | /* Map back into a voltage to verify we're still in bounds */ | |
2128 | voltage = rdev->desc->ops->list_voltage(rdev, ret); | |
2129 | if (voltage < min_uV || voltage > max_uV) | |
2130 | return -EINVAL; | |
2131 | ||
2132 | return ret; | |
2133 | } | |
2134 | EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); | |
2135 | ||
75790251 MB |
2136 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2137 | int min_uV, int max_uV) | |
2138 | { | |
2139 | int ret; | |
77af1b26 | 2140 | int delay = 0; |
e843fc46 | 2141 | int best_val; |
75790251 | 2142 | unsigned int selector; |
eba41a5e | 2143 | int old_selector = -1; |
75790251 MB |
2144 | |
2145 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2146 | ||
bf5892a8 MB |
2147 | min_uV += rdev->constraints->uV_offset; |
2148 | max_uV += rdev->constraints->uV_offset; | |
2149 | ||
eba41a5e AL |
2150 | /* |
2151 | * If we can't obtain the old selector there is not enough | |
2152 | * info to call set_voltage_time_sel(). | |
2153 | */ | |
8b7485ef AL |
2154 | if (_regulator_is_enabled(rdev) && |
2155 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2156 | rdev->desc->ops->get_voltage_sel) { |
2157 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2158 | if (old_selector < 0) | |
2159 | return old_selector; | |
2160 | } | |
2161 | ||
75790251 MB |
2162 | if (rdev->desc->ops->set_voltage) { |
2163 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2164 | &selector); | |
e8eef82b | 2165 | } else if (rdev->desc->ops->set_voltage_sel) { |
e843fc46 MB |
2166 | if (rdev->desc->ops->map_voltage) |
2167 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, | |
2168 | max_uV); | |
2169 | else | |
2170 | ret = regulator_map_voltage_iterate(rdev, min_uV, | |
2171 | max_uV); | |
e8eef82b | 2172 | |
e843fc46 MB |
2173 | if (ret >= 0) { |
2174 | selector = ret; | |
2175 | ret = rdev->desc->ops->set_voltage_sel(rdev, ret); | |
e8eef82b | 2176 | } |
75790251 MB |
2177 | } else { |
2178 | ret = -EINVAL; | |
2179 | } | |
e8eef82b | 2180 | |
e843fc46 MB |
2181 | if (rdev->desc->ops->list_voltage) |
2182 | best_val = rdev->desc->ops->list_voltage(rdev, selector); | |
2183 | else | |
2184 | best_val = -1; | |
77af1b26 | 2185 | |
eba41a5e | 2186 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
8b7485ef | 2187 | if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 && |
eba41a5e | 2188 | rdev->desc->ops->set_voltage_time_sel) { |
77af1b26 | 2189 | |
eba41a5e AL |
2190 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2191 | old_selector, selector); | |
2192 | if (delay < 0) { | |
2193 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2194 | delay); | |
2195 | delay = 0; | |
e8eef82b | 2196 | } |
75790251 MB |
2197 | } |
2198 | ||
77af1b26 LW |
2199 | /* Insert any necessary delays */ |
2200 | if (delay >= 1000) { | |
2201 | mdelay(delay / 1000); | |
2202 | udelay(delay % 1000); | |
2203 | } else if (delay) { | |
2204 | udelay(delay); | |
2205 | } | |
2206 | ||
ded06a52 MB |
2207 | if (ret == 0) |
2208 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
2209 | NULL); | |
2210 | ||
eba41a5e | 2211 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2212 | |
2213 | return ret; | |
2214 | } | |
2215 | ||
414c70cb LG |
2216 | /** |
2217 | * regulator_set_voltage - set regulator output voltage | |
2218 | * @regulator: regulator source | |
2219 | * @min_uV: Minimum required voltage in uV | |
2220 | * @max_uV: Maximum acceptable voltage in uV | |
2221 | * | |
2222 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2223 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2224 | * | |
2225 | * If the regulator is enabled then the voltage will change to the new value | |
2226 | * immediately otherwise if the regulator is disabled the regulator will | |
2227 | * output at the new voltage when enabled. | |
2228 | * | |
2229 | * NOTE: If the regulator is shared between several devices then the lowest | |
2230 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2231 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2232 | * calling this function otherwise this call will fail. |
2233 | */ | |
2234 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2235 | { | |
2236 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2237 | int ret = 0; |
414c70cb LG |
2238 | |
2239 | mutex_lock(&rdev->mutex); | |
2240 | ||
95a3c23a MB |
2241 | /* If we're setting the same range as last time the change |
2242 | * should be a noop (some cpufreq implementations use the same | |
2243 | * voltage for multiple frequencies, for example). | |
2244 | */ | |
2245 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2246 | goto out; | |
2247 | ||
414c70cb | 2248 | /* sanity check */ |
e8eef82b MB |
2249 | if (!rdev->desc->ops->set_voltage && |
2250 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2251 | ret = -EINVAL; |
2252 | goto out; | |
2253 | } | |
2254 | ||
2255 | /* constraints check */ | |
2256 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2257 | if (ret < 0) | |
2258 | goto out; | |
2259 | regulator->min_uV = min_uV; | |
2260 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2261 | |
05fda3b1 TP |
2262 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2263 | if (ret < 0) | |
2264 | goto out; | |
2265 | ||
75790251 | 2266 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 2267 | |
414c70cb LG |
2268 | out: |
2269 | mutex_unlock(&rdev->mutex); | |
2270 | return ret; | |
2271 | } | |
2272 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2273 | ||
88cd222b LW |
2274 | /** |
2275 | * regulator_set_voltage_time - get raise/fall time | |
2276 | * @regulator: regulator source | |
2277 | * @old_uV: starting voltage in microvolts | |
2278 | * @new_uV: target voltage in microvolts | |
2279 | * | |
2280 | * Provided with the starting and ending voltage, this function attempts to | |
2281 | * calculate the time in microseconds required to rise or fall to this new | |
2282 | * voltage. | |
2283 | */ | |
2284 | int regulator_set_voltage_time(struct regulator *regulator, | |
2285 | int old_uV, int new_uV) | |
2286 | { | |
2287 | struct regulator_dev *rdev = regulator->rdev; | |
2288 | struct regulator_ops *ops = rdev->desc->ops; | |
2289 | int old_sel = -1; | |
2290 | int new_sel = -1; | |
2291 | int voltage; | |
2292 | int i; | |
2293 | ||
2294 | /* Currently requires operations to do this */ | |
2295 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2296 | || !rdev->desc->n_voltages) | |
2297 | return -EINVAL; | |
2298 | ||
2299 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2300 | /* We only look for exact voltage matches here */ | |
2301 | voltage = regulator_list_voltage(regulator, i); | |
2302 | if (voltage < 0) | |
2303 | return -EINVAL; | |
2304 | if (voltage == 0) | |
2305 | continue; | |
2306 | if (voltage == old_uV) | |
2307 | old_sel = i; | |
2308 | if (voltage == new_uV) | |
2309 | new_sel = i; | |
2310 | } | |
2311 | ||
2312 | if (old_sel < 0 || new_sel < 0) | |
2313 | return -EINVAL; | |
2314 | ||
2315 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2316 | } | |
2317 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2318 | ||
98a175b6 YSB |
2319 | /** |
2320 | *regulator_set_voltage_time_sel - get raise/fall time | |
2321 | * @regulator: regulator source | |
2322 | * @old_selector: selector for starting voltage | |
2323 | * @new_selector: selector for target voltage | |
2324 | * | |
2325 | * Provided with the starting and target voltage selectors, this function | |
2326 | * returns time in microseconds required to rise or fall to this new voltage | |
2327 | * | |
f11d08c3 | 2328 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2329 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2330 | */ |
2331 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2332 | unsigned int old_selector, | |
2333 | unsigned int new_selector) | |
2334 | { | |
398715ab | 2335 | unsigned int ramp_delay = 0; |
f11d08c3 | 2336 | int old_volt, new_volt; |
398715ab AL |
2337 | |
2338 | if (rdev->constraints->ramp_delay) | |
2339 | ramp_delay = rdev->constraints->ramp_delay; | |
2340 | else if (rdev->desc->ramp_delay) | |
2341 | ramp_delay = rdev->desc->ramp_delay; | |
2342 | ||
2343 | if (ramp_delay == 0) { | |
6f0b2c69 | 2344 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2345 | return 0; |
6f0b2c69 | 2346 | } |
398715ab | 2347 | |
f11d08c3 AL |
2348 | /* sanity check */ |
2349 | if (!rdev->desc->ops->list_voltage) | |
2350 | return -EINVAL; | |
398715ab | 2351 | |
f11d08c3 AL |
2352 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2353 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2354 | ||
2355 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2356 | } |
b19dbf71 | 2357 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2358 | |
606a2562 MB |
2359 | /** |
2360 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2361 | * @regulator: regulator source | |
2362 | * | |
2363 | * Re-apply the last configured voltage. This is intended to be used | |
2364 | * where some external control source the consumer is cooperating with | |
2365 | * has caused the configured voltage to change. | |
2366 | */ | |
2367 | int regulator_sync_voltage(struct regulator *regulator) | |
2368 | { | |
2369 | struct regulator_dev *rdev = regulator->rdev; | |
2370 | int ret, min_uV, max_uV; | |
2371 | ||
2372 | mutex_lock(&rdev->mutex); | |
2373 | ||
2374 | if (!rdev->desc->ops->set_voltage && | |
2375 | !rdev->desc->ops->set_voltage_sel) { | |
2376 | ret = -EINVAL; | |
2377 | goto out; | |
2378 | } | |
2379 | ||
2380 | /* This is only going to work if we've had a voltage configured. */ | |
2381 | if (!regulator->min_uV && !regulator->max_uV) { | |
2382 | ret = -EINVAL; | |
2383 | goto out; | |
2384 | } | |
2385 | ||
2386 | min_uV = regulator->min_uV; | |
2387 | max_uV = regulator->max_uV; | |
2388 | ||
2389 | /* This should be a paranoia check... */ | |
2390 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2391 | if (ret < 0) | |
2392 | goto out; | |
2393 | ||
2394 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2395 | if (ret < 0) | |
2396 | goto out; | |
2397 | ||
2398 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2399 | ||
2400 | out: | |
2401 | mutex_unlock(&rdev->mutex); | |
2402 | return ret; | |
2403 | } | |
2404 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2405 | ||
414c70cb LG |
2406 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2407 | { | |
bf5892a8 | 2408 | int sel, ret; |
476c2d83 MB |
2409 | |
2410 | if (rdev->desc->ops->get_voltage_sel) { | |
2411 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2412 | if (sel < 0) | |
2413 | return sel; | |
bf5892a8 | 2414 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2415 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2416 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 2417 | } else { |
414c70cb | 2418 | return -EINVAL; |
cb220d16 | 2419 | } |
bf5892a8 | 2420 | |
cb220d16 AL |
2421 | if (ret < 0) |
2422 | return ret; | |
bf5892a8 | 2423 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2424 | } |
2425 | ||
2426 | /** | |
2427 | * regulator_get_voltage - get regulator output voltage | |
2428 | * @regulator: regulator source | |
2429 | * | |
2430 | * This returns the current regulator voltage in uV. | |
2431 | * | |
2432 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2433 | * function should not be used to determine regulator state. | |
2434 | */ | |
2435 | int regulator_get_voltage(struct regulator *regulator) | |
2436 | { | |
2437 | int ret; | |
2438 | ||
2439 | mutex_lock(®ulator->rdev->mutex); | |
2440 | ||
2441 | ret = _regulator_get_voltage(regulator->rdev); | |
2442 | ||
2443 | mutex_unlock(®ulator->rdev->mutex); | |
2444 | ||
2445 | return ret; | |
2446 | } | |
2447 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2448 | ||
2449 | /** | |
2450 | * regulator_set_current_limit - set regulator output current limit | |
2451 | * @regulator: regulator source | |
2452 | * @min_uA: Minimuum supported current in uA | |
2453 | * @max_uA: Maximum supported current in uA | |
2454 | * | |
2455 | * Sets current sink to the desired output current. This can be set during | |
2456 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2457 | * | |
2458 | * If the regulator is enabled then the current will change to the new value | |
2459 | * immediately otherwise if the regulator is disabled the regulator will | |
2460 | * output at the new current when enabled. | |
2461 | * | |
2462 | * NOTE: Regulator system constraints must be set for this regulator before | |
2463 | * calling this function otherwise this call will fail. | |
2464 | */ | |
2465 | int regulator_set_current_limit(struct regulator *regulator, | |
2466 | int min_uA, int max_uA) | |
2467 | { | |
2468 | struct regulator_dev *rdev = regulator->rdev; | |
2469 | int ret; | |
2470 | ||
2471 | mutex_lock(&rdev->mutex); | |
2472 | ||
2473 | /* sanity check */ | |
2474 | if (!rdev->desc->ops->set_current_limit) { | |
2475 | ret = -EINVAL; | |
2476 | goto out; | |
2477 | } | |
2478 | ||
2479 | /* constraints check */ | |
2480 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2481 | if (ret < 0) | |
2482 | goto out; | |
2483 | ||
2484 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2485 | out: | |
2486 | mutex_unlock(&rdev->mutex); | |
2487 | return ret; | |
2488 | } | |
2489 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2490 | ||
2491 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2492 | { | |
2493 | int ret; | |
2494 | ||
2495 | mutex_lock(&rdev->mutex); | |
2496 | ||
2497 | /* sanity check */ | |
2498 | if (!rdev->desc->ops->get_current_limit) { | |
2499 | ret = -EINVAL; | |
2500 | goto out; | |
2501 | } | |
2502 | ||
2503 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2504 | out: | |
2505 | mutex_unlock(&rdev->mutex); | |
2506 | return ret; | |
2507 | } | |
2508 | ||
2509 | /** | |
2510 | * regulator_get_current_limit - get regulator output current | |
2511 | * @regulator: regulator source | |
2512 | * | |
2513 | * This returns the current supplied by the specified current sink in uA. | |
2514 | * | |
2515 | * NOTE: If the regulator is disabled it will return the current value. This | |
2516 | * function should not be used to determine regulator state. | |
2517 | */ | |
2518 | int regulator_get_current_limit(struct regulator *regulator) | |
2519 | { | |
2520 | return _regulator_get_current_limit(regulator->rdev); | |
2521 | } | |
2522 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2523 | ||
2524 | /** | |
2525 | * regulator_set_mode - set regulator operating mode | |
2526 | * @regulator: regulator source | |
2527 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2528 | * | |
2529 | * Set regulator operating mode to increase regulator efficiency or improve | |
2530 | * regulation performance. | |
2531 | * | |
2532 | * NOTE: Regulator system constraints must be set for this regulator before | |
2533 | * calling this function otherwise this call will fail. | |
2534 | */ | |
2535 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2536 | { | |
2537 | struct regulator_dev *rdev = regulator->rdev; | |
2538 | int ret; | |
500b4ac9 | 2539 | int regulator_curr_mode; |
414c70cb LG |
2540 | |
2541 | mutex_lock(&rdev->mutex); | |
2542 | ||
2543 | /* sanity check */ | |
2544 | if (!rdev->desc->ops->set_mode) { | |
2545 | ret = -EINVAL; | |
2546 | goto out; | |
2547 | } | |
2548 | ||
500b4ac9 SI |
2549 | /* return if the same mode is requested */ |
2550 | if (rdev->desc->ops->get_mode) { | |
2551 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2552 | if (regulator_curr_mode == mode) { | |
2553 | ret = 0; | |
2554 | goto out; | |
2555 | } | |
2556 | } | |
2557 | ||
414c70cb | 2558 | /* constraints check */ |
22c51b47 | 2559 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2560 | if (ret < 0) |
2561 | goto out; | |
2562 | ||
2563 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2564 | out: | |
2565 | mutex_unlock(&rdev->mutex); | |
2566 | return ret; | |
2567 | } | |
2568 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2569 | ||
2570 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2571 | { | |
2572 | int ret; | |
2573 | ||
2574 | mutex_lock(&rdev->mutex); | |
2575 | ||
2576 | /* sanity check */ | |
2577 | if (!rdev->desc->ops->get_mode) { | |
2578 | ret = -EINVAL; | |
2579 | goto out; | |
2580 | } | |
2581 | ||
2582 | ret = rdev->desc->ops->get_mode(rdev); | |
2583 | out: | |
2584 | mutex_unlock(&rdev->mutex); | |
2585 | return ret; | |
2586 | } | |
2587 | ||
2588 | /** | |
2589 | * regulator_get_mode - get regulator operating mode | |
2590 | * @regulator: regulator source | |
2591 | * | |
2592 | * Get the current regulator operating mode. | |
2593 | */ | |
2594 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2595 | { | |
2596 | return _regulator_get_mode(regulator->rdev); | |
2597 | } | |
2598 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2599 | ||
2600 | /** | |
2601 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2602 | * @regulator: regulator source | |
2603 | * @uA_load: load current | |
2604 | * | |
2605 | * Notifies the regulator core of a new device load. This is then used by | |
2606 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2607 | * operating mode for the new regulator loading. | |
2608 | * | |
2609 | * Consumer devices notify their supply regulator of the maximum power | |
2610 | * they will require (can be taken from device datasheet in the power | |
2611 | * consumption tables) when they change operational status and hence power | |
2612 | * state. Examples of operational state changes that can affect power | |
2613 | * consumption are :- | |
2614 | * | |
2615 | * o Device is opened / closed. | |
2616 | * o Device I/O is about to begin or has just finished. | |
2617 | * o Device is idling in between work. | |
2618 | * | |
2619 | * This information is also exported via sysfs to userspace. | |
2620 | * | |
2621 | * DRMS will sum the total requested load on the regulator and change | |
2622 | * to the most efficient operating mode if platform constraints allow. | |
2623 | * | |
2624 | * Returns the new regulator mode or error. | |
2625 | */ | |
2626 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2627 | { | |
2628 | struct regulator_dev *rdev = regulator->rdev; | |
2629 | struct regulator *consumer; | |
2630 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2631 | unsigned int mode; | |
2632 | ||
2633 | mutex_lock(&rdev->mutex); | |
2634 | ||
a4b41483 MB |
2635 | /* |
2636 | * first check to see if we can set modes at all, otherwise just | |
2637 | * tell the consumer everything is OK. | |
2638 | */ | |
414c70cb LG |
2639 | regulator->uA_load = uA_load; |
2640 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2641 | if (ret < 0) { |
2642 | ret = 0; | |
414c70cb | 2643 | goto out; |
a4b41483 | 2644 | } |
414c70cb | 2645 | |
414c70cb LG |
2646 | if (!rdev->desc->ops->get_optimum_mode) |
2647 | goto out; | |
2648 | ||
a4b41483 MB |
2649 | /* |
2650 | * we can actually do this so any errors are indicators of | |
2651 | * potential real failure. | |
2652 | */ | |
2653 | ret = -EINVAL; | |
2654 | ||
854ccbae AL |
2655 | if (!rdev->desc->ops->set_mode) |
2656 | goto out; | |
2657 | ||
414c70cb | 2658 | /* get output voltage */ |
1bf5a1f8 | 2659 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2660 | if (output_uV <= 0) { |
5da84fd9 | 2661 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2662 | goto out; |
2663 | } | |
2664 | ||
2665 | /* get input voltage */ | |
1bf5a1f8 MB |
2666 | input_uV = 0; |
2667 | if (rdev->supply) | |
3801b86a | 2668 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 2669 | if (input_uV <= 0) |
414c70cb LG |
2670 | input_uV = rdev->constraints->input_uV; |
2671 | if (input_uV <= 0) { | |
5da84fd9 | 2672 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2673 | goto out; |
2674 | } | |
2675 | ||
2676 | /* calc total requested load for this regulator */ | |
2677 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2678 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2679 | |
2680 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2681 | input_uV, output_uV, | |
2682 | total_uA_load); | |
2c608234 | 2683 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2684 | if (ret < 0) { |
5da84fd9 JP |
2685 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2686 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2687 | goto out; |
2688 | } | |
2689 | ||
2690 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2691 | if (ret < 0) { |
5da84fd9 | 2692 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2693 | goto out; |
2694 | } | |
2695 | ret = mode; | |
2696 | out: | |
2697 | mutex_unlock(&rdev->mutex); | |
2698 | return ret; | |
2699 | } | |
2700 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2701 | ||
2702 | /** | |
2703 | * regulator_register_notifier - register regulator event notifier | |
2704 | * @regulator: regulator source | |
69279fb9 | 2705 | * @nb: notifier block |
414c70cb LG |
2706 | * |
2707 | * Register notifier block to receive regulator events. | |
2708 | */ | |
2709 | int regulator_register_notifier(struct regulator *regulator, | |
2710 | struct notifier_block *nb) | |
2711 | { | |
2712 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2713 | nb); | |
2714 | } | |
2715 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2716 | ||
2717 | /** | |
2718 | * regulator_unregister_notifier - unregister regulator event notifier | |
2719 | * @regulator: regulator source | |
69279fb9 | 2720 | * @nb: notifier block |
414c70cb LG |
2721 | * |
2722 | * Unregister regulator event notifier block. | |
2723 | */ | |
2724 | int regulator_unregister_notifier(struct regulator *regulator, | |
2725 | struct notifier_block *nb) | |
2726 | { | |
2727 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2728 | nb); | |
2729 | } | |
2730 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2731 | ||
b136fb44 JC |
2732 | /* notify regulator consumers and downstream regulator consumers. |
2733 | * Note mutex must be held by caller. | |
2734 | */ | |
414c70cb LG |
2735 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2736 | unsigned long event, void *data) | |
2737 | { | |
414c70cb | 2738 | /* call rdev chain first */ |
414c70cb | 2739 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2740 | } |
2741 | ||
2742 | /** | |
2743 | * regulator_bulk_get - get multiple regulator consumers | |
2744 | * | |
2745 | * @dev: Device to supply | |
2746 | * @num_consumers: Number of consumers to register | |
2747 | * @consumers: Configuration of consumers; clients are stored here. | |
2748 | * | |
2749 | * @return 0 on success, an errno on failure. | |
2750 | * | |
2751 | * This helper function allows drivers to get several regulator | |
2752 | * consumers in one operation. If any of the regulators cannot be | |
2753 | * acquired then any regulators that were allocated will be freed | |
2754 | * before returning to the caller. | |
2755 | */ | |
2756 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2757 | struct regulator_bulk_data *consumers) | |
2758 | { | |
2759 | int i; | |
2760 | int ret; | |
2761 | ||
2762 | for (i = 0; i < num_consumers; i++) | |
2763 | consumers[i].consumer = NULL; | |
2764 | ||
2765 | for (i = 0; i < num_consumers; i++) { | |
2766 | consumers[i].consumer = regulator_get(dev, | |
2767 | consumers[i].supply); | |
2768 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2769 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2770 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2771 | consumers[i].supply, ret); | |
414c70cb LG |
2772 | consumers[i].consumer = NULL; |
2773 | goto err; | |
2774 | } | |
2775 | } | |
2776 | ||
2777 | return 0; | |
2778 | ||
2779 | err: | |
b29c7690 | 2780 | while (--i >= 0) |
414c70cb LG |
2781 | regulator_put(consumers[i].consumer); |
2782 | ||
2783 | return ret; | |
2784 | } | |
2785 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2786 | ||
e6e74030 MB |
2787 | /** |
2788 | * devm_regulator_bulk_get - managed get multiple regulator consumers | |
2789 | * | |
2790 | * @dev: Device to supply | |
2791 | * @num_consumers: Number of consumers to register | |
2792 | * @consumers: Configuration of consumers; clients are stored here. | |
2793 | * | |
2794 | * @return 0 on success, an errno on failure. | |
2795 | * | |
2796 | * This helper function allows drivers to get several regulator | |
2797 | * consumers in one operation with management, the regulators will | |
2798 | * automatically be freed when the device is unbound. If any of the | |
2799 | * regulators cannot be acquired then any regulators that were | |
2800 | * allocated will be freed before returning to the caller. | |
2801 | */ | |
2802 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, | |
2803 | struct regulator_bulk_data *consumers) | |
2804 | { | |
2805 | int i; | |
2806 | int ret; | |
2807 | ||
2808 | for (i = 0; i < num_consumers; i++) | |
2809 | consumers[i].consumer = NULL; | |
2810 | ||
2811 | for (i = 0; i < num_consumers; i++) { | |
2812 | consumers[i].consumer = devm_regulator_get(dev, | |
2813 | consumers[i].supply); | |
2814 | if (IS_ERR(consumers[i].consumer)) { | |
2815 | ret = PTR_ERR(consumers[i].consumer); | |
2816 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
2817 | consumers[i].supply, ret); | |
2818 | consumers[i].consumer = NULL; | |
2819 | goto err; | |
2820 | } | |
2821 | } | |
2822 | ||
2823 | return 0; | |
2824 | ||
2825 | err: | |
2826 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2827 | devm_regulator_put(consumers[i].consumer); | |
2828 | ||
2829 | return ret; | |
2830 | } | |
2831 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); | |
2832 | ||
f21e0e81 MB |
2833 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2834 | { | |
2835 | struct regulator_bulk_data *bulk = data; | |
2836 | ||
2837 | bulk->ret = regulator_enable(bulk->consumer); | |
2838 | } | |
2839 | ||
414c70cb LG |
2840 | /** |
2841 | * regulator_bulk_enable - enable multiple regulator consumers | |
2842 | * | |
2843 | * @num_consumers: Number of consumers | |
2844 | * @consumers: Consumer data; clients are stored here. | |
2845 | * @return 0 on success, an errno on failure | |
2846 | * | |
2847 | * This convenience API allows consumers to enable multiple regulator | |
2848 | * clients in a single API call. If any consumers cannot be enabled | |
2849 | * then any others that were enabled will be disabled again prior to | |
2850 | * return. | |
2851 | */ | |
2852 | int regulator_bulk_enable(int num_consumers, | |
2853 | struct regulator_bulk_data *consumers) | |
2854 | { | |
f21e0e81 | 2855 | LIST_HEAD(async_domain); |
414c70cb | 2856 | int i; |
f21e0e81 | 2857 | int ret = 0; |
414c70cb | 2858 | |
6492bc1b MB |
2859 | for (i = 0; i < num_consumers; i++) { |
2860 | if (consumers[i].consumer->always_on) | |
2861 | consumers[i].ret = 0; | |
2862 | else | |
2863 | async_schedule_domain(regulator_bulk_enable_async, | |
2864 | &consumers[i], &async_domain); | |
2865 | } | |
f21e0e81 MB |
2866 | |
2867 | async_synchronize_full_domain(&async_domain); | |
2868 | ||
2869 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2870 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2871 | if (consumers[i].ret != 0) { |
2872 | ret = consumers[i].ret; | |
414c70cb | 2873 | goto err; |
f21e0e81 | 2874 | } |
414c70cb LG |
2875 | } |
2876 | ||
2877 | return 0; | |
2878 | ||
2879 | err: | |
b29c7690 AL |
2880 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); |
2881 | while (--i >= 0) | |
2882 | regulator_disable(consumers[i].consumer); | |
414c70cb LG |
2883 | |
2884 | return ret; | |
2885 | } | |
2886 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2887 | ||
2888 | /** | |
2889 | * regulator_bulk_disable - disable multiple regulator consumers | |
2890 | * | |
2891 | * @num_consumers: Number of consumers | |
2892 | * @consumers: Consumer data; clients are stored here. | |
2893 | * @return 0 on success, an errno on failure | |
2894 | * | |
2895 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
2896 | * clients in a single API call. If any consumers cannot be disabled |
2897 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
2898 | * return. |
2899 | */ | |
2900 | int regulator_bulk_disable(int num_consumers, | |
2901 | struct regulator_bulk_data *consumers) | |
2902 | { | |
2903 | int i; | |
01e86f49 | 2904 | int ret, r; |
414c70cb | 2905 | |
49e22632 | 2906 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
2907 | ret = regulator_disable(consumers[i].consumer); |
2908 | if (ret != 0) | |
2909 | goto err; | |
2910 | } | |
2911 | ||
2912 | return 0; | |
2913 | ||
2914 | err: | |
5da84fd9 | 2915 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
2916 | for (++i; i < num_consumers; ++i) { |
2917 | r = regulator_enable(consumers[i].consumer); | |
2918 | if (r != 0) | |
2919 | pr_err("Failed to reename %s: %d\n", | |
2920 | consumers[i].supply, r); | |
2921 | } | |
414c70cb LG |
2922 | |
2923 | return ret; | |
2924 | } | |
2925 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2926 | ||
e1de2f42 DK |
2927 | /** |
2928 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
2929 | * | |
2930 | * @num_consumers: Number of consumers | |
2931 | * @consumers: Consumer data; clients are stored here. | |
2932 | * @return 0 on success, an errno on failure | |
2933 | * | |
2934 | * This convenience API allows consumers to forcibly disable multiple regulator | |
2935 | * clients in a single API call. | |
2936 | * NOTE: This should be used for situations when device damage will | |
2937 | * likely occur if the regulators are not disabled (e.g. over temp). | |
2938 | * Although regulator_force_disable function call for some consumers can | |
2939 | * return error numbers, the function is called for all consumers. | |
2940 | */ | |
2941 | int regulator_bulk_force_disable(int num_consumers, | |
2942 | struct regulator_bulk_data *consumers) | |
2943 | { | |
2944 | int i; | |
2945 | int ret; | |
2946 | ||
2947 | for (i = 0; i < num_consumers; i++) | |
2948 | consumers[i].ret = | |
2949 | regulator_force_disable(consumers[i].consumer); | |
2950 | ||
2951 | for (i = 0; i < num_consumers; i++) { | |
2952 | if (consumers[i].ret != 0) { | |
2953 | ret = consumers[i].ret; | |
2954 | goto out; | |
2955 | } | |
2956 | } | |
2957 | ||
2958 | return 0; | |
2959 | out: | |
2960 | return ret; | |
2961 | } | |
2962 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
2963 | ||
414c70cb LG |
2964 | /** |
2965 | * regulator_bulk_free - free multiple regulator consumers | |
2966 | * | |
2967 | * @num_consumers: Number of consumers | |
2968 | * @consumers: Consumer data; clients are stored here. | |
2969 | * | |
2970 | * This convenience API allows consumers to free multiple regulator | |
2971 | * clients in a single API call. | |
2972 | */ | |
2973 | void regulator_bulk_free(int num_consumers, | |
2974 | struct regulator_bulk_data *consumers) | |
2975 | { | |
2976 | int i; | |
2977 | ||
2978 | for (i = 0; i < num_consumers; i++) { | |
2979 | regulator_put(consumers[i].consumer); | |
2980 | consumers[i].consumer = NULL; | |
2981 | } | |
2982 | } | |
2983 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2984 | ||
2985 | /** | |
2986 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2987 | * @rdev: regulator source |
414c70cb | 2988 | * @event: notifier block |
69279fb9 | 2989 | * @data: callback-specific data. |
414c70cb LG |
2990 | * |
2991 | * Called by regulator drivers to notify clients a regulator event has | |
2992 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2993 | * Note lock must be held by caller. |
414c70cb LG |
2994 | */ |
2995 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2996 | unsigned long event, void *data) | |
2997 | { | |
2998 | _notifier_call_chain(rdev, event, data); | |
2999 | return NOTIFY_DONE; | |
3000 | ||
3001 | } | |
3002 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3003 | ||
be721979 MB |
3004 | /** |
3005 | * regulator_mode_to_status - convert a regulator mode into a status | |
3006 | * | |
3007 | * @mode: Mode to convert | |
3008 | * | |
3009 | * Convert a regulator mode into a status. | |
3010 | */ | |
3011 | int regulator_mode_to_status(unsigned int mode) | |
3012 | { | |
3013 | switch (mode) { | |
3014 | case REGULATOR_MODE_FAST: | |
3015 | return REGULATOR_STATUS_FAST; | |
3016 | case REGULATOR_MODE_NORMAL: | |
3017 | return REGULATOR_STATUS_NORMAL; | |
3018 | case REGULATOR_MODE_IDLE: | |
3019 | return REGULATOR_STATUS_IDLE; | |
3020 | case REGULATOR_STATUS_STANDBY: | |
3021 | return REGULATOR_STATUS_STANDBY; | |
3022 | default: | |
3023 | return 0; | |
3024 | } | |
3025 | } | |
3026 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3027 | ||
7ad68e2f DB |
3028 | /* |
3029 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3030 | * create attributes that can be meaningfully displayed. | |
3031 | */ | |
3032 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3033 | { | |
3034 | struct device *dev = &rdev->dev; | |
3035 | struct regulator_ops *ops = rdev->desc->ops; | |
3036 | int status = 0; | |
3037 | ||
3038 | /* some attributes need specific methods to be displayed */ | |
4c78899b MB |
3039 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
3040 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { | |
7ad68e2f DB |
3041 | status = device_create_file(dev, &dev_attr_microvolts); |
3042 | if (status < 0) | |
3043 | return status; | |
3044 | } | |
3045 | if (ops->get_current_limit) { | |
3046 | status = device_create_file(dev, &dev_attr_microamps); | |
3047 | if (status < 0) | |
3048 | return status; | |
3049 | } | |
3050 | if (ops->get_mode) { | |
3051 | status = device_create_file(dev, &dev_attr_opmode); | |
3052 | if (status < 0) | |
3053 | return status; | |
3054 | } | |
3055 | if (ops->is_enabled) { | |
3056 | status = device_create_file(dev, &dev_attr_state); | |
3057 | if (status < 0) | |
3058 | return status; | |
3059 | } | |
853116a1 DB |
3060 | if (ops->get_status) { |
3061 | status = device_create_file(dev, &dev_attr_status); | |
3062 | if (status < 0) | |
3063 | return status; | |
3064 | } | |
7ad68e2f DB |
3065 | |
3066 | /* some attributes are type-specific */ | |
3067 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3068 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3069 | if (status < 0) | |
3070 | return status; | |
3071 | } | |
3072 | ||
3073 | /* all the other attributes exist to support constraints; | |
3074 | * don't show them if there are no constraints, or if the | |
3075 | * relevant supporting methods are missing. | |
3076 | */ | |
3077 | if (!rdev->constraints) | |
3078 | return status; | |
3079 | ||
3080 | /* constraints need specific supporting methods */ | |
e8eef82b | 3081 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3082 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3083 | if (status < 0) | |
3084 | return status; | |
3085 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3086 | if (status < 0) | |
3087 | return status; | |
3088 | } | |
3089 | if (ops->set_current_limit) { | |
3090 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3091 | if (status < 0) | |
3092 | return status; | |
3093 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3094 | if (status < 0) | |
3095 | return status; | |
3096 | } | |
3097 | ||
7ad68e2f DB |
3098 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3099 | if (status < 0) | |
3100 | return status; | |
3101 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3102 | if (status < 0) | |
3103 | return status; | |
3104 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3105 | if (status < 0) | |
3106 | return status; | |
3107 | ||
3108 | if (ops->set_suspend_voltage) { | |
3109 | status = device_create_file(dev, | |
3110 | &dev_attr_suspend_standby_microvolts); | |
3111 | if (status < 0) | |
3112 | return status; | |
3113 | status = device_create_file(dev, | |
3114 | &dev_attr_suspend_mem_microvolts); | |
3115 | if (status < 0) | |
3116 | return status; | |
3117 | status = device_create_file(dev, | |
3118 | &dev_attr_suspend_disk_microvolts); | |
3119 | if (status < 0) | |
3120 | return status; | |
3121 | } | |
3122 | ||
3123 | if (ops->set_suspend_mode) { | |
3124 | status = device_create_file(dev, | |
3125 | &dev_attr_suspend_standby_mode); | |
3126 | if (status < 0) | |
3127 | return status; | |
3128 | status = device_create_file(dev, | |
3129 | &dev_attr_suspend_mem_mode); | |
3130 | if (status < 0) | |
3131 | return status; | |
3132 | status = device_create_file(dev, | |
3133 | &dev_attr_suspend_disk_mode); | |
3134 | if (status < 0) | |
3135 | return status; | |
3136 | } | |
3137 | ||
3138 | return status; | |
3139 | } | |
3140 | ||
1130e5b3 MB |
3141 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3142 | { | |
1130e5b3 | 3143 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3144 | if (!rdev->debugfs) { |
1130e5b3 | 3145 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3146 | return; |
3147 | } | |
3148 | ||
3149 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3150 | &rdev->use_count); | |
3151 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3152 | &rdev->open_count); | |
1130e5b3 MB |
3153 | } |
3154 | ||
414c70cb LG |
3155 | /** |
3156 | * regulator_register - register regulator | |
69279fb9 | 3157 | * @regulator_desc: regulator to register |
c172708d | 3158 | * @config: runtime configuration for regulator |
414c70cb LG |
3159 | * |
3160 | * Called by regulator drivers to register a regulator. | |
3161 | * Returns 0 on success. | |
3162 | */ | |
65f26846 MB |
3163 | struct regulator_dev * |
3164 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3165 | const struct regulator_config *config) |
414c70cb | 3166 | { |
9a8f5e07 | 3167 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3168 | const struct regulator_init_data *init_data; |
414c70cb LG |
3169 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3170 | struct regulator_dev *rdev; | |
32c8fad4 | 3171 | struct device *dev; |
a5766f11 | 3172 | int ret, i; |
69511a45 | 3173 | const char *supply = NULL; |
414c70cb | 3174 | |
c172708d | 3175 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3176 | return ERR_PTR(-EINVAL); |
3177 | ||
32c8fad4 | 3178 | dev = config->dev; |
dcf70112 | 3179 | WARN_ON(!dev); |
32c8fad4 | 3180 | |
414c70cb LG |
3181 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3182 | return ERR_PTR(-EINVAL); | |
3183 | ||
cd78dfc6 DL |
3184 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3185 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3186 | return ERR_PTR(-EINVAL); |
3187 | ||
476c2d83 MB |
3188 | /* Only one of each should be implemented */ |
3189 | WARN_ON(regulator_desc->ops->get_voltage && | |
3190 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3191 | WARN_ON(regulator_desc->ops->set_voltage && |
3192 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3193 | |
3194 | /* If we're using selectors we must implement list_voltage. */ | |
3195 | if (regulator_desc->ops->get_voltage_sel && | |
3196 | !regulator_desc->ops->list_voltage) { | |
3197 | return ERR_PTR(-EINVAL); | |
3198 | } | |
e8eef82b MB |
3199 | if (regulator_desc->ops->set_voltage_sel && |
3200 | !regulator_desc->ops->list_voltage) { | |
3201 | return ERR_PTR(-EINVAL); | |
3202 | } | |
476c2d83 | 3203 | |
c172708d MB |
3204 | init_data = config->init_data; |
3205 | ||
414c70cb LG |
3206 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3207 | if (rdev == NULL) | |
3208 | return ERR_PTR(-ENOMEM); | |
3209 | ||
3210 | mutex_lock(®ulator_list_mutex); | |
3211 | ||
3212 | mutex_init(&rdev->mutex); | |
c172708d | 3213 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3214 | rdev->owner = regulator_desc->owner; |
3215 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3216 | if (config->regmap) |
3217 | rdev->regmap = config->regmap; | |
3218 | else | |
3219 | rdev->regmap = dev_get_regmap(dev, NULL); | |
414c70cb | 3220 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3221 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3222 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3223 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3224 | |
a5766f11 | 3225 | /* preform any regulator specific init */ |
9a8f5e07 | 3226 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3227 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3228 | if (ret < 0) |
3229 | goto clean; | |
a5766f11 LG |
3230 | } |
3231 | ||
a5766f11 | 3232 | /* register with sysfs */ |
414c70cb | 3233 | rdev->dev.class = ®ulator_class; |
c172708d | 3234 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3235 | rdev->dev.parent = dev; |
812460a9 KS |
3236 | dev_set_name(&rdev->dev, "regulator.%d", |
3237 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3238 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3239 | if (ret != 0) { |
3240 | put_device(&rdev->dev); | |
4fca9545 | 3241 | goto clean; |
ad7725cb | 3242 | } |
a5766f11 LG |
3243 | |
3244 | dev_set_drvdata(&rdev->dev, rdev); | |
3245 | ||
74f544c1 | 3246 | /* set regulator constraints */ |
9a8f5e07 MB |
3247 | if (init_data) |
3248 | constraints = &init_data->constraints; | |
3249 | ||
3250 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3251 | if (ret < 0) |
3252 | goto scrub; | |
3253 | ||
7ad68e2f DB |
3254 | /* add attributes supported by this regulator */ |
3255 | ret = add_regulator_attributes(rdev); | |
3256 | if (ret < 0) | |
3257 | goto scrub; | |
3258 | ||
9a8f5e07 | 3259 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3260 | supply = init_data->supply_regulator; |
3261 | else if (regulator_desc->supply_name) | |
3262 | supply = regulator_desc->supply_name; | |
3263 | ||
3264 | if (supply) { | |
0178f3e2 | 3265 | struct regulator_dev *r; |
0178f3e2 | 3266 | |
6d191a5f | 3267 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3268 | |
69511a45 RN |
3269 | if (!r) { |
3270 | dev_err(dev, "Failed to find supply %s\n", supply); | |
04bf3011 | 3271 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3272 | goto scrub; |
3273 | } | |
3274 | ||
3275 | ret = set_supply(rdev, r); | |
3276 | if (ret < 0) | |
3277 | goto scrub; | |
b2296bd4 LD |
3278 | |
3279 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3280 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3281 | ret = regulator_enable(rdev->supply); |
3282 | if (ret < 0) | |
3283 | goto scrub; | |
3284 | } | |
0178f3e2 MB |
3285 | } |
3286 | ||
a5766f11 | 3287 | /* add consumers devices */ |
9a8f5e07 MB |
3288 | if (init_data) { |
3289 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3290 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3291 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3292 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3293 | if (ret < 0) { |
3294 | dev_err(dev, "Failed to set supply %s\n", | |
3295 | init_data->consumer_supplies[i].supply); | |
3296 | goto unset_supplies; | |
3297 | } | |
23c2f041 | 3298 | } |
414c70cb | 3299 | } |
a5766f11 LG |
3300 | |
3301 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3302 | |
3303 | rdev_init_debugfs(rdev); | |
a5766f11 | 3304 | out: |
414c70cb LG |
3305 | mutex_unlock(®ulator_list_mutex); |
3306 | return rdev; | |
4fca9545 | 3307 | |
d4033b54 JN |
3308 | unset_supplies: |
3309 | unset_regulator_supplies(rdev); | |
3310 | ||
4fca9545 | 3311 | scrub: |
e81dba85 MB |
3312 | if (rdev->supply) |
3313 | regulator_put(rdev->supply); | |
1a6958e7 | 3314 | kfree(rdev->constraints); |
4fca9545 | 3315 | device_unregister(&rdev->dev); |
53032daf PW |
3316 | /* device core frees rdev */ |
3317 | rdev = ERR_PTR(ret); | |
3318 | goto out; | |
3319 | ||
4fca9545 DB |
3320 | clean: |
3321 | kfree(rdev); | |
3322 | rdev = ERR_PTR(ret); | |
3323 | goto out; | |
414c70cb LG |
3324 | } |
3325 | EXPORT_SYMBOL_GPL(regulator_register); | |
3326 | ||
3327 | /** | |
3328 | * regulator_unregister - unregister regulator | |
69279fb9 | 3329 | * @rdev: regulator to unregister |
414c70cb LG |
3330 | * |
3331 | * Called by regulator drivers to unregister a regulator. | |
3332 | */ | |
3333 | void regulator_unregister(struct regulator_dev *rdev) | |
3334 | { | |
3335 | if (rdev == NULL) | |
3336 | return; | |
3337 | ||
e032b376 MB |
3338 | if (rdev->supply) |
3339 | regulator_put(rdev->supply); | |
414c70cb | 3340 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3341 | debugfs_remove_recursive(rdev->debugfs); |
da07ecd9 | 3342 | flush_work_sync(&rdev->disable_work.work); |
6bf87d17 | 3343 | WARN_ON(rdev->open_count); |
0f1d747b | 3344 | unset_regulator_supplies(rdev); |
414c70cb | 3345 | list_del(&rdev->list); |
f8c12fe3 | 3346 | kfree(rdev->constraints); |
58fb5cf5 | 3347 | device_unregister(&rdev->dev); |
414c70cb LG |
3348 | mutex_unlock(®ulator_list_mutex); |
3349 | } | |
3350 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3351 | ||
414c70cb | 3352 | /** |
cf7bbcdf | 3353 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3354 | * @state: system suspend state |
3355 | * | |
3356 | * Configure each regulator with it's suspend operating parameters for state. | |
3357 | * This will usually be called by machine suspend code prior to supending. | |
3358 | */ | |
3359 | int regulator_suspend_prepare(suspend_state_t state) | |
3360 | { | |
3361 | struct regulator_dev *rdev; | |
3362 | int ret = 0; | |
3363 | ||
3364 | /* ON is handled by regulator active state */ | |
3365 | if (state == PM_SUSPEND_ON) | |
3366 | return -EINVAL; | |
3367 | ||
3368 | mutex_lock(®ulator_list_mutex); | |
3369 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3370 | ||
3371 | mutex_lock(&rdev->mutex); | |
3372 | ret = suspend_prepare(rdev, state); | |
3373 | mutex_unlock(&rdev->mutex); | |
3374 | ||
3375 | if (ret < 0) { | |
5da84fd9 | 3376 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3377 | goto out; |
3378 | } | |
3379 | } | |
3380 | out: | |
3381 | mutex_unlock(®ulator_list_mutex); | |
3382 | return ret; | |
3383 | } | |
3384 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3385 | ||
7a32b589 MH |
3386 | /** |
3387 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3388 | * | |
3389 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3390 | * and that should be turned on according to the regulators properties. | |
3391 | */ | |
3392 | int regulator_suspend_finish(void) | |
3393 | { | |
3394 | struct regulator_dev *rdev; | |
3395 | int ret = 0, error; | |
3396 | ||
3397 | mutex_lock(®ulator_list_mutex); | |
3398 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3399 | struct regulator_ops *ops = rdev->desc->ops; | |
3400 | ||
3401 | mutex_lock(&rdev->mutex); | |
3402 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3403 | ops->enable) { | |
3404 | error = ops->enable(rdev); | |
3405 | if (error) | |
3406 | ret = error; | |
3407 | } else { | |
3408 | if (!has_full_constraints) | |
3409 | goto unlock; | |
3410 | if (!ops->disable) | |
3411 | goto unlock; | |
b1a86831 | 3412 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3413 | goto unlock; |
3414 | ||
3415 | error = ops->disable(rdev); | |
3416 | if (error) | |
3417 | ret = error; | |
3418 | } | |
3419 | unlock: | |
3420 | mutex_unlock(&rdev->mutex); | |
3421 | } | |
3422 | mutex_unlock(®ulator_list_mutex); | |
3423 | return ret; | |
3424 | } | |
3425 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3426 | ||
ca725561 MB |
3427 | /** |
3428 | * regulator_has_full_constraints - the system has fully specified constraints | |
3429 | * | |
3430 | * Calling this function will cause the regulator API to disable all | |
3431 | * regulators which have a zero use count and don't have an always_on | |
3432 | * constraint in a late_initcall. | |
3433 | * | |
3434 | * The intention is that this will become the default behaviour in a | |
3435 | * future kernel release so users are encouraged to use this facility | |
3436 | * now. | |
3437 | */ | |
3438 | void regulator_has_full_constraints(void) | |
3439 | { | |
3440 | has_full_constraints = 1; | |
3441 | } | |
3442 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3443 | ||
688fe99a MB |
3444 | /** |
3445 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
3446 | * | |
3447 | * Calling this function will cause the regulator API to provide a | |
3448 | * dummy regulator to consumers if no physical regulator is found, | |
3449 | * allowing most consumers to proceed as though a regulator were | |
3450 | * configured. This allows systems such as those with software | |
3451 | * controllable regulators for the CPU core only to be brought up more | |
3452 | * readily. | |
3453 | */ | |
3454 | void regulator_use_dummy_regulator(void) | |
3455 | { | |
3456 | board_wants_dummy_regulator = true; | |
3457 | } | |
3458 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
3459 | ||
414c70cb LG |
3460 | /** |
3461 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3462 | * @rdev: regulator |
414c70cb LG |
3463 | * |
3464 | * Get rdev regulator driver private data. This call can be used in the | |
3465 | * regulator driver context. | |
3466 | */ | |
3467 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3468 | { | |
3469 | return rdev->reg_data; | |
3470 | } | |
3471 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3472 | ||
3473 | /** | |
3474 | * regulator_get_drvdata - get regulator driver data | |
3475 | * @regulator: regulator | |
3476 | * | |
3477 | * Get regulator driver private data. This call can be used in the consumer | |
3478 | * driver context when non API regulator specific functions need to be called. | |
3479 | */ | |
3480 | void *regulator_get_drvdata(struct regulator *regulator) | |
3481 | { | |
3482 | return regulator->rdev->reg_data; | |
3483 | } | |
3484 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3485 | ||
3486 | /** | |
3487 | * regulator_set_drvdata - set regulator driver data | |
3488 | * @regulator: regulator | |
3489 | * @data: data | |
3490 | */ | |
3491 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3492 | { | |
3493 | regulator->rdev->reg_data = data; | |
3494 | } | |
3495 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3496 | ||
3497 | /** | |
3498 | * regulator_get_id - get regulator ID | |
69279fb9 | 3499 | * @rdev: regulator |
414c70cb LG |
3500 | */ |
3501 | int rdev_get_id(struct regulator_dev *rdev) | |
3502 | { | |
3503 | return rdev->desc->id; | |
3504 | } | |
3505 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3506 | ||
a5766f11 LG |
3507 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3508 | { | |
3509 | return &rdev->dev; | |
3510 | } | |
3511 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3512 | ||
3513 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3514 | { | |
3515 | return reg_init_data->driver_data; | |
3516 | } | |
3517 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3518 | ||
ba55a974 MB |
3519 | #ifdef CONFIG_DEBUG_FS |
3520 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3521 | size_t count, loff_t *ppos) | |
3522 | { | |
3523 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3524 | ssize_t len, ret = 0; | |
3525 | struct regulator_map *map; | |
3526 | ||
3527 | if (!buf) | |
3528 | return -ENOMEM; | |
3529 | ||
3530 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3531 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3532 | "%s -> %s.%s\n", | |
3533 | rdev_get_name(map->regulator), map->dev_name, | |
3534 | map->supply); | |
3535 | if (len >= 0) | |
3536 | ret += len; | |
3537 | if (ret > PAGE_SIZE) { | |
3538 | ret = PAGE_SIZE; | |
3539 | break; | |
3540 | } | |
3541 | } | |
3542 | ||
3543 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3544 | ||
3545 | kfree(buf); | |
3546 | ||
3547 | return ret; | |
3548 | } | |
24751434 | 3549 | #endif |
ba55a974 MB |
3550 | |
3551 | static const struct file_operations supply_map_fops = { | |
24751434 | 3552 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3553 | .read = supply_map_read_file, |
3554 | .llseek = default_llseek, | |
ba55a974 | 3555 | #endif |
24751434 | 3556 | }; |
ba55a974 | 3557 | |
414c70cb LG |
3558 | static int __init regulator_init(void) |
3559 | { | |
34abbd68 MB |
3560 | int ret; |
3561 | ||
34abbd68 MB |
3562 | ret = class_register(®ulator_class); |
3563 | ||
1130e5b3 | 3564 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3565 | if (!debugfs_root) |
1130e5b3 | 3566 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3567 | |
f4d562c6 MB |
3568 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3569 | &supply_map_fops); | |
1130e5b3 | 3570 | |
34abbd68 MB |
3571 | regulator_dummy_init(); |
3572 | ||
3573 | return ret; | |
414c70cb LG |
3574 | } |
3575 | ||
3576 | /* init early to allow our consumers to complete system booting */ | |
3577 | core_initcall(regulator_init); | |
ca725561 MB |
3578 | |
3579 | static int __init regulator_init_complete(void) | |
3580 | { | |
3581 | struct regulator_dev *rdev; | |
3582 | struct regulator_ops *ops; | |
3583 | struct regulation_constraints *c; | |
3584 | int enabled, ret; | |
ca725561 MB |
3585 | |
3586 | mutex_lock(®ulator_list_mutex); | |
3587 | ||
3588 | /* If we have a full configuration then disable any regulators | |
3589 | * which are not in use or always_on. This will become the | |
3590 | * default behaviour in the future. | |
3591 | */ | |
3592 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3593 | ops = rdev->desc->ops; | |
3594 | c = rdev->constraints; | |
3595 | ||
f25e0b4f | 3596 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3597 | continue; |
3598 | ||
3599 | mutex_lock(&rdev->mutex); | |
3600 | ||
3601 | if (rdev->use_count) | |
3602 | goto unlock; | |
3603 | ||
3604 | /* If we can't read the status assume it's on. */ | |
3605 | if (ops->is_enabled) | |
3606 | enabled = ops->is_enabled(rdev); | |
3607 | else | |
3608 | enabled = 1; | |
3609 | ||
3610 | if (!enabled) | |
3611 | goto unlock; | |
3612 | ||
3613 | if (has_full_constraints) { | |
3614 | /* We log since this may kill the system if it | |
3615 | * goes wrong. */ | |
5da84fd9 | 3616 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3617 | ret = ops->disable(rdev); |
3618 | if (ret != 0) { | |
5da84fd9 | 3619 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3620 | } |
3621 | } else { | |
3622 | /* The intention is that in future we will | |
3623 | * assume that full constraints are provided | |
3624 | * so warn even if we aren't going to do | |
3625 | * anything here. | |
3626 | */ | |
5da84fd9 | 3627 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3628 | } |
3629 | ||
3630 | unlock: | |
3631 | mutex_unlock(&rdev->mutex); | |
3632 | } | |
3633 | ||
3634 | mutex_unlock(®ulator_list_mutex); | |
3635 | ||
3636 | return 0; | |
3637 | } | |
3638 | late_initcall(regulator_init_complete); |