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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> | |
18 | #include <linux/device.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/suspend.h> | |
31aae2be | 22 | #include <linux/delay.h> |
414c70cb LG |
23 | #include <linux/regulator/consumer.h> |
24 | #include <linux/regulator/driver.h> | |
25 | #include <linux/regulator/machine.h> | |
26 | ||
34abbd68 MB |
27 | #include "dummy.h" |
28 | ||
414c70cb LG |
29 | #define REGULATOR_VERSION "0.5" |
30 | ||
31 | static DEFINE_MUTEX(regulator_list_mutex); | |
32 | static LIST_HEAD(regulator_list); | |
33 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 34 | static int has_full_constraints; |
414c70cb | 35 | |
8dc5390d | 36 | /* |
414c70cb LG |
37 | * struct regulator_map |
38 | * | |
39 | * Used to provide symbolic supply names to devices. | |
40 | */ | |
41 | struct regulator_map { | |
42 | struct list_head list; | |
40f9244f | 43 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 44 | const char *supply; |
a5766f11 | 45 | struct regulator_dev *regulator; |
414c70cb LG |
46 | }; |
47 | ||
414c70cb LG |
48 | /* |
49 | * struct regulator | |
50 | * | |
51 | * One for each consumer device. | |
52 | */ | |
53 | struct regulator { | |
54 | struct device *dev; | |
55 | struct list_head list; | |
56 | int uA_load; | |
57 | int min_uV; | |
58 | int max_uV; | |
414c70cb LG |
59 | char *supply_name; |
60 | struct device_attribute dev_attr; | |
61 | struct regulator_dev *rdev; | |
62 | }; | |
63 | ||
64 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
65 | static int _regulator_disable(struct regulator_dev *rdev); | |
66 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
67 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
68 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
69 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
70 | unsigned long event, void *data); | |
71 | ||
1083c393 MB |
72 | static const char *rdev_get_name(struct regulator_dev *rdev) |
73 | { | |
74 | if (rdev->constraints && rdev->constraints->name) | |
75 | return rdev->constraints->name; | |
76 | else if (rdev->desc->name) | |
77 | return rdev->desc->name; | |
78 | else | |
79 | return ""; | |
80 | } | |
81 | ||
414c70cb LG |
82 | /* gets the regulator for a given consumer device */ |
83 | static struct regulator *get_device_regulator(struct device *dev) | |
84 | { | |
85 | struct regulator *regulator = NULL; | |
86 | struct regulator_dev *rdev; | |
87 | ||
88 | mutex_lock(®ulator_list_mutex); | |
89 | list_for_each_entry(rdev, ®ulator_list, list) { | |
90 | mutex_lock(&rdev->mutex); | |
91 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
92 | if (regulator->dev == dev) { | |
93 | mutex_unlock(&rdev->mutex); | |
94 | mutex_unlock(®ulator_list_mutex); | |
95 | return regulator; | |
96 | } | |
97 | } | |
98 | mutex_unlock(&rdev->mutex); | |
99 | } | |
100 | mutex_unlock(®ulator_list_mutex); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | /* Platform voltage constraint check */ | |
105 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
106 | int *min_uV, int *max_uV) | |
107 | { | |
108 | BUG_ON(*min_uV > *max_uV); | |
109 | ||
110 | if (!rdev->constraints) { | |
111 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 112 | rdev_get_name(rdev)); |
414c70cb LG |
113 | return -ENODEV; |
114 | } | |
115 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
116 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 117 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
118 | return -EPERM; |
119 | } | |
120 | ||
121 | if (*max_uV > rdev->constraints->max_uV) | |
122 | *max_uV = rdev->constraints->max_uV; | |
123 | if (*min_uV < rdev->constraints->min_uV) | |
124 | *min_uV = rdev->constraints->min_uV; | |
125 | ||
126 | if (*min_uV > *max_uV) | |
127 | return -EINVAL; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | /* current constraint check */ | |
133 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
134 | int *min_uA, int *max_uA) | |
135 | { | |
136 | BUG_ON(*min_uA > *max_uA); | |
137 | ||
138 | if (!rdev->constraints) { | |
139 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 140 | rdev_get_name(rdev)); |
414c70cb LG |
141 | return -ENODEV; |
142 | } | |
143 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
144 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 145 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
146 | return -EPERM; |
147 | } | |
148 | ||
149 | if (*max_uA > rdev->constraints->max_uA) | |
150 | *max_uA = rdev->constraints->max_uA; | |
151 | if (*min_uA < rdev->constraints->min_uA) | |
152 | *min_uA = rdev->constraints->min_uA; | |
153 | ||
154 | if (*min_uA > *max_uA) | |
155 | return -EINVAL; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | /* operating mode constraint check */ | |
161 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
162 | { | |
e573520b DB |
163 | switch (mode) { |
164 | case REGULATOR_MODE_FAST: | |
165 | case REGULATOR_MODE_NORMAL: | |
166 | case REGULATOR_MODE_IDLE: | |
167 | case REGULATOR_MODE_STANDBY: | |
168 | break; | |
169 | default: | |
170 | return -EINVAL; | |
171 | } | |
172 | ||
414c70cb LG |
173 | if (!rdev->constraints) { |
174 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 175 | rdev_get_name(rdev)); |
414c70cb LG |
176 | return -ENODEV; |
177 | } | |
178 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
179 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 180 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
181 | return -EPERM; |
182 | } | |
183 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
184 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
1083c393 | 185 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
186 | return -EINVAL; |
187 | } | |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* dynamic regulator mode switching constraint check */ | |
192 | static int regulator_check_drms(struct regulator_dev *rdev) | |
193 | { | |
194 | if (!rdev->constraints) { | |
195 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 196 | rdev_get_name(rdev)); |
414c70cb LG |
197 | return -ENODEV; |
198 | } | |
199 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
200 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 201 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
202 | return -EPERM; |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static ssize_t device_requested_uA_show(struct device *dev, | |
208 | struct device_attribute *attr, char *buf) | |
209 | { | |
210 | struct regulator *regulator; | |
211 | ||
212 | regulator = get_device_regulator(dev); | |
213 | if (regulator == NULL) | |
214 | return 0; | |
215 | ||
216 | return sprintf(buf, "%d\n", regulator->uA_load); | |
217 | } | |
218 | ||
219 | static ssize_t regulator_uV_show(struct device *dev, | |
220 | struct device_attribute *attr, char *buf) | |
221 | { | |
a5766f11 | 222 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
223 | ssize_t ret; |
224 | ||
225 | mutex_lock(&rdev->mutex); | |
226 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
227 | mutex_unlock(&rdev->mutex); | |
228 | ||
229 | return ret; | |
230 | } | |
7ad68e2f | 231 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
232 | |
233 | static ssize_t regulator_uA_show(struct device *dev, | |
234 | struct device_attribute *attr, char *buf) | |
235 | { | |
a5766f11 | 236 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
237 | |
238 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
239 | } | |
7ad68e2f | 240 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 241 | |
bc558a60 MB |
242 | static ssize_t regulator_name_show(struct device *dev, |
243 | struct device_attribute *attr, char *buf) | |
244 | { | |
245 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 246 | |
1083c393 | 247 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
248 | } |
249 | ||
4fca9545 | 250 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 251 | { |
414c70cb LG |
252 | switch (mode) { |
253 | case REGULATOR_MODE_FAST: | |
254 | return sprintf(buf, "fast\n"); | |
255 | case REGULATOR_MODE_NORMAL: | |
256 | return sprintf(buf, "normal\n"); | |
257 | case REGULATOR_MODE_IDLE: | |
258 | return sprintf(buf, "idle\n"); | |
259 | case REGULATOR_MODE_STANDBY: | |
260 | return sprintf(buf, "standby\n"); | |
261 | } | |
262 | return sprintf(buf, "unknown\n"); | |
263 | } | |
264 | ||
4fca9545 DB |
265 | static ssize_t regulator_opmode_show(struct device *dev, |
266 | struct device_attribute *attr, char *buf) | |
414c70cb | 267 | { |
a5766f11 | 268 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 269 | |
4fca9545 DB |
270 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
271 | } | |
7ad68e2f | 272 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
273 | |
274 | static ssize_t regulator_print_state(char *buf, int state) | |
275 | { | |
414c70cb LG |
276 | if (state > 0) |
277 | return sprintf(buf, "enabled\n"); | |
278 | else if (state == 0) | |
279 | return sprintf(buf, "disabled\n"); | |
280 | else | |
281 | return sprintf(buf, "unknown\n"); | |
282 | } | |
283 | ||
4fca9545 DB |
284 | static ssize_t regulator_state_show(struct device *dev, |
285 | struct device_attribute *attr, char *buf) | |
286 | { | |
287 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
288 | ssize_t ret; |
289 | ||
290 | mutex_lock(&rdev->mutex); | |
291 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
292 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 293 | |
9332546f | 294 | return ret; |
4fca9545 | 295 | } |
7ad68e2f | 296 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 297 | |
853116a1 DB |
298 | static ssize_t regulator_status_show(struct device *dev, |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
301 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
302 | int status; | |
303 | char *label; | |
304 | ||
305 | status = rdev->desc->ops->get_status(rdev); | |
306 | if (status < 0) | |
307 | return status; | |
308 | ||
309 | switch (status) { | |
310 | case REGULATOR_STATUS_OFF: | |
311 | label = "off"; | |
312 | break; | |
313 | case REGULATOR_STATUS_ON: | |
314 | label = "on"; | |
315 | break; | |
316 | case REGULATOR_STATUS_ERROR: | |
317 | label = "error"; | |
318 | break; | |
319 | case REGULATOR_STATUS_FAST: | |
320 | label = "fast"; | |
321 | break; | |
322 | case REGULATOR_STATUS_NORMAL: | |
323 | label = "normal"; | |
324 | break; | |
325 | case REGULATOR_STATUS_IDLE: | |
326 | label = "idle"; | |
327 | break; | |
328 | case REGULATOR_STATUS_STANDBY: | |
329 | label = "standby"; | |
330 | break; | |
331 | default: | |
332 | return -ERANGE; | |
333 | } | |
334 | ||
335 | return sprintf(buf, "%s\n", label); | |
336 | } | |
337 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
338 | ||
414c70cb LG |
339 | static ssize_t regulator_min_uA_show(struct device *dev, |
340 | struct device_attribute *attr, char *buf) | |
341 | { | |
a5766f11 | 342 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
343 | |
344 | if (!rdev->constraints) | |
345 | return sprintf(buf, "constraint not defined\n"); | |
346 | ||
347 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
348 | } | |
7ad68e2f | 349 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
350 | |
351 | static ssize_t regulator_max_uA_show(struct device *dev, | |
352 | struct device_attribute *attr, char *buf) | |
353 | { | |
a5766f11 | 354 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
355 | |
356 | if (!rdev->constraints) | |
357 | return sprintf(buf, "constraint not defined\n"); | |
358 | ||
359 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
360 | } | |
7ad68e2f | 361 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
362 | |
363 | static ssize_t regulator_min_uV_show(struct device *dev, | |
364 | struct device_attribute *attr, char *buf) | |
365 | { | |
a5766f11 | 366 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
367 | |
368 | if (!rdev->constraints) | |
369 | return sprintf(buf, "constraint not defined\n"); | |
370 | ||
371 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
372 | } | |
7ad68e2f | 373 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
374 | |
375 | static ssize_t regulator_max_uV_show(struct device *dev, | |
376 | struct device_attribute *attr, char *buf) | |
377 | { | |
a5766f11 | 378 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
379 | |
380 | if (!rdev->constraints) | |
381 | return sprintf(buf, "constraint not defined\n"); | |
382 | ||
383 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
384 | } | |
7ad68e2f | 385 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
386 | |
387 | static ssize_t regulator_total_uA_show(struct device *dev, | |
388 | struct device_attribute *attr, char *buf) | |
389 | { | |
a5766f11 | 390 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
391 | struct regulator *regulator; |
392 | int uA = 0; | |
393 | ||
394 | mutex_lock(&rdev->mutex); | |
395 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 396 | uA += regulator->uA_load; |
414c70cb LG |
397 | mutex_unlock(&rdev->mutex); |
398 | return sprintf(buf, "%d\n", uA); | |
399 | } | |
7ad68e2f | 400 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
401 | |
402 | static ssize_t regulator_num_users_show(struct device *dev, | |
403 | struct device_attribute *attr, char *buf) | |
404 | { | |
a5766f11 | 405 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
406 | return sprintf(buf, "%d\n", rdev->use_count); |
407 | } | |
408 | ||
409 | static ssize_t regulator_type_show(struct device *dev, | |
410 | struct device_attribute *attr, char *buf) | |
411 | { | |
a5766f11 | 412 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
413 | |
414 | switch (rdev->desc->type) { | |
415 | case REGULATOR_VOLTAGE: | |
416 | return sprintf(buf, "voltage\n"); | |
417 | case REGULATOR_CURRENT: | |
418 | return sprintf(buf, "current\n"); | |
419 | } | |
420 | return sprintf(buf, "unknown\n"); | |
421 | } | |
422 | ||
423 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
424 | struct device_attribute *attr, char *buf) | |
425 | { | |
a5766f11 | 426 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 427 | |
414c70cb LG |
428 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
429 | } | |
7ad68e2f DB |
430 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
431 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
432 | |
433 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
434 | struct device_attribute *attr, char *buf) | |
435 | { | |
a5766f11 | 436 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 437 | |
414c70cb LG |
438 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
439 | } | |
7ad68e2f DB |
440 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
441 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
442 | |
443 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 447 | |
414c70cb LG |
448 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
449 | } | |
7ad68e2f DB |
450 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
451 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 452 | |
414c70cb LG |
453 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
454 | struct device_attribute *attr, char *buf) | |
455 | { | |
a5766f11 | 456 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 457 | |
4fca9545 DB |
458 | return regulator_print_opmode(buf, |
459 | rdev->constraints->state_mem.mode); | |
414c70cb | 460 | } |
7ad68e2f DB |
461 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
462 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
463 | |
464 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
465 | struct device_attribute *attr, char *buf) | |
466 | { | |
a5766f11 | 467 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 468 | |
4fca9545 DB |
469 | return regulator_print_opmode(buf, |
470 | rdev->constraints->state_disk.mode); | |
414c70cb | 471 | } |
7ad68e2f DB |
472 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
473 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
474 | |
475 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
476 | struct device_attribute *attr, char *buf) | |
477 | { | |
a5766f11 | 478 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 479 | |
4fca9545 DB |
480 | return regulator_print_opmode(buf, |
481 | rdev->constraints->state_standby.mode); | |
414c70cb | 482 | } |
7ad68e2f DB |
483 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
484 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
485 | |
486 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
487 | struct device_attribute *attr, char *buf) | |
488 | { | |
a5766f11 | 489 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 490 | |
4fca9545 DB |
491 | return regulator_print_state(buf, |
492 | rdev->constraints->state_mem.enabled); | |
414c70cb | 493 | } |
7ad68e2f DB |
494 | static DEVICE_ATTR(suspend_mem_state, 0444, |
495 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
496 | |
497 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
498 | struct device_attribute *attr, char *buf) | |
499 | { | |
a5766f11 | 500 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 501 | |
4fca9545 DB |
502 | return regulator_print_state(buf, |
503 | rdev->constraints->state_disk.enabled); | |
414c70cb | 504 | } |
7ad68e2f DB |
505 | static DEVICE_ATTR(suspend_disk_state, 0444, |
506 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
507 | |
508 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
509 | struct device_attribute *attr, char *buf) | |
510 | { | |
a5766f11 | 511 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 512 | |
4fca9545 DB |
513 | return regulator_print_state(buf, |
514 | rdev->constraints->state_standby.enabled); | |
414c70cb | 515 | } |
7ad68e2f DB |
516 | static DEVICE_ATTR(suspend_standby_state, 0444, |
517 | regulator_suspend_standby_state_show, NULL); | |
518 | ||
bc558a60 | 519 | |
7ad68e2f DB |
520 | /* |
521 | * These are the only attributes are present for all regulators. | |
522 | * Other attributes are a function of regulator functionality. | |
523 | */ | |
414c70cb | 524 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 525 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
526 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
527 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
528 | __ATTR_NULL, |
529 | }; | |
530 | ||
531 | static void regulator_dev_release(struct device *dev) | |
532 | { | |
a5766f11 | 533 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
534 | kfree(rdev); |
535 | } | |
536 | ||
537 | static struct class regulator_class = { | |
538 | .name = "regulator", | |
539 | .dev_release = regulator_dev_release, | |
540 | .dev_attrs = regulator_dev_attrs, | |
541 | }; | |
542 | ||
543 | /* Calculate the new optimum regulator operating mode based on the new total | |
544 | * consumer load. All locks held by caller */ | |
545 | static void drms_uA_update(struct regulator_dev *rdev) | |
546 | { | |
547 | struct regulator *sibling; | |
548 | int current_uA = 0, output_uV, input_uV, err; | |
549 | unsigned int mode; | |
550 | ||
551 | err = regulator_check_drms(rdev); | |
552 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
036de8ef DC |
553 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) |
554 | return; | |
414c70cb LG |
555 | |
556 | /* get output voltage */ | |
557 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
558 | if (output_uV <= 0) | |
559 | return; | |
560 | ||
561 | /* get input voltage */ | |
562 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
563 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
564 | else | |
565 | input_uV = rdev->constraints->input_uV; | |
566 | if (input_uV <= 0) | |
567 | return; | |
568 | ||
569 | /* calc total requested load */ | |
570 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 571 | current_uA += sibling->uA_load; |
414c70cb LG |
572 | |
573 | /* now get the optimum mode for our new total regulator load */ | |
574 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
575 | output_uV, current_uA); | |
576 | ||
577 | /* check the new mode is allowed */ | |
578 | err = regulator_check_mode(rdev, mode); | |
579 | if (err == 0) | |
580 | rdev->desc->ops->set_mode(rdev, mode); | |
581 | } | |
582 | ||
583 | static int suspend_set_state(struct regulator_dev *rdev, | |
584 | struct regulator_state *rstate) | |
585 | { | |
586 | int ret = 0; | |
638f85c5 MB |
587 | bool can_set_state; |
588 | ||
589 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
590 | rdev->desc->ops->set_suspend_disable; | |
591 | ||
592 | /* If we have no suspend mode configration don't set anything; | |
593 | * only warn if the driver actually makes the suspend mode | |
594 | * configurable. | |
595 | */ | |
596 | if (!rstate->enabled && !rstate->disabled) { | |
597 | if (can_set_state) | |
598 | printk(KERN_WARNING "%s: No configuration for %s\n", | |
599 | __func__, rdev_get_name(rdev)); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | if (rstate->enabled && rstate->disabled) { | |
604 | printk(KERN_ERR "%s: invalid configuration for %s\n", | |
605 | __func__, rdev_get_name(rdev)); | |
606 | return -EINVAL; | |
607 | } | |
414c70cb | 608 | |
638f85c5 | 609 | if (!can_set_state) { |
a5766f11 LG |
610 | printk(KERN_ERR "%s: no way to set suspend state\n", |
611 | __func__); | |
414c70cb | 612 | return -EINVAL; |
a5766f11 | 613 | } |
414c70cb LG |
614 | |
615 | if (rstate->enabled) | |
616 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
617 | else | |
618 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
619 | if (ret < 0) { | |
620 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
621 | return ret; | |
622 | } | |
623 | ||
624 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
625 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
626 | if (ret < 0) { | |
627 | printk(KERN_ERR "%s: failed to set voltage\n", | |
628 | __func__); | |
629 | return ret; | |
630 | } | |
631 | } | |
632 | ||
633 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
634 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
635 | if (ret < 0) { | |
636 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
637 | return ret; | |
638 | } | |
639 | } | |
640 | return ret; | |
641 | } | |
642 | ||
643 | /* locks held by caller */ | |
644 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
645 | { | |
646 | if (!rdev->constraints) | |
647 | return -EINVAL; | |
648 | ||
649 | switch (state) { | |
650 | case PM_SUSPEND_STANDBY: | |
651 | return suspend_set_state(rdev, | |
652 | &rdev->constraints->state_standby); | |
653 | case PM_SUSPEND_MEM: | |
654 | return suspend_set_state(rdev, | |
655 | &rdev->constraints->state_mem); | |
656 | case PM_SUSPEND_MAX: | |
657 | return suspend_set_state(rdev, | |
658 | &rdev->constraints->state_disk); | |
659 | default: | |
660 | return -EINVAL; | |
661 | } | |
662 | } | |
663 | ||
664 | static void print_constraints(struct regulator_dev *rdev) | |
665 | { | |
666 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 667 | char buf[80] = ""; |
8f031b48 MB |
668 | int count = 0; |
669 | int ret; | |
414c70cb | 670 | |
8f031b48 | 671 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 672 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
673 | count += sprintf(buf + count, "%d mV ", |
674 | constraints->min_uV / 1000); | |
414c70cb | 675 | else |
8f031b48 MB |
676 | count += sprintf(buf + count, "%d <--> %d mV ", |
677 | constraints->min_uV / 1000, | |
678 | constraints->max_uV / 1000); | |
679 | } | |
680 | ||
681 | if (!constraints->min_uV || | |
682 | constraints->min_uV != constraints->max_uV) { | |
683 | ret = _regulator_get_voltage(rdev); | |
684 | if (ret > 0) | |
685 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
686 | } | |
687 | ||
688 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 689 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
690 | count += sprintf(buf + count, "%d mA ", |
691 | constraints->min_uA / 1000); | |
414c70cb | 692 | else |
8f031b48 MB |
693 | count += sprintf(buf + count, "%d <--> %d mA ", |
694 | constraints->min_uA / 1000, | |
695 | constraints->max_uA / 1000); | |
696 | } | |
697 | ||
698 | if (!constraints->min_uA || | |
699 | constraints->min_uA != constraints->max_uA) { | |
700 | ret = _regulator_get_current_limit(rdev); | |
701 | if (ret > 0) | |
702 | count += sprintf(buf + count, "at %d uA ", ret / 1000); | |
414c70cb | 703 | } |
8f031b48 | 704 | |
414c70cb LG |
705 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
706 | count += sprintf(buf + count, "fast "); | |
707 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
708 | count += sprintf(buf + count, "normal "); | |
709 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
710 | count += sprintf(buf + count, "idle "); | |
711 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
712 | count += sprintf(buf + count, "standby"); | |
713 | ||
1083c393 | 714 | printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); |
414c70cb LG |
715 | } |
716 | ||
e79055d6 | 717 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 718 | struct regulation_constraints *constraints) |
a5766f11 | 719 | { |
e5fda26c | 720 | struct regulator_ops *ops = rdev->desc->ops; |
1083c393 | 721 | const char *name = rdev_get_name(rdev); |
af5866c9 MB |
722 | int ret; |
723 | ||
724 | /* do we need to apply the constraint voltage */ | |
725 | if (rdev->constraints->apply_uV && | |
726 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
727 | ops->set_voltage) { | |
728 | ret = ops->set_voltage(rdev, | |
729 | rdev->constraints->min_uV, rdev->constraints->max_uV); | |
730 | if (ret < 0) { | |
731 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", | |
732 | __func__, | |
733 | rdev->constraints->min_uV, name); | |
734 | rdev->constraints = NULL; | |
735 | return ret; | |
736 | } | |
737 | } | |
e06f5b4f | 738 | |
4367cfdc DB |
739 | /* constrain machine-level voltage specs to fit |
740 | * the actual range supported by this regulator. | |
741 | */ | |
742 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
743 | int count = rdev->desc->n_voltages; | |
744 | int i; | |
745 | int min_uV = INT_MAX; | |
746 | int max_uV = INT_MIN; | |
747 | int cmin = constraints->min_uV; | |
748 | int cmax = constraints->max_uV; | |
749 | ||
3e590918 MB |
750 | /* it's safe to autoconfigure fixed-voltage supplies |
751 | and the constraints are used by list_voltage. */ | |
4367cfdc | 752 | if (count == 1 && !cmin) { |
3e590918 | 753 | cmin = 1; |
4367cfdc | 754 | cmax = INT_MAX; |
3e590918 MB |
755 | constraints->min_uV = cmin; |
756 | constraints->max_uV = cmax; | |
4367cfdc DB |
757 | } |
758 | ||
3e2b9abd MB |
759 | /* voltage constraints are optional */ |
760 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 761 | return 0; |
3e2b9abd | 762 | |
4367cfdc | 763 | /* else require explicit machine-level constraints */ |
3e2b9abd | 764 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
765 | pr_err("%s: %s '%s' voltage constraints\n", |
766 | __func__, "invalid", name); | |
e79055d6 | 767 | return -EINVAL; |
4367cfdc DB |
768 | } |
769 | ||
770 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
771 | for (i = 0; i < count; i++) { | |
772 | int value; | |
773 | ||
774 | value = ops->list_voltage(rdev, i); | |
775 | if (value <= 0) | |
776 | continue; | |
777 | ||
778 | /* maybe adjust [min_uV..max_uV] */ | |
779 | if (value >= cmin && value < min_uV) | |
780 | min_uV = value; | |
781 | if (value <= cmax && value > max_uV) | |
782 | max_uV = value; | |
783 | } | |
784 | ||
785 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
786 | if (max_uV < min_uV) { | |
787 | pr_err("%s: %s '%s' voltage constraints\n", | |
788 | __func__, "unsupportable", name); | |
e79055d6 | 789 | return -EINVAL; |
4367cfdc DB |
790 | } |
791 | ||
792 | /* use regulator's subset of machine constraints */ | |
793 | if (constraints->min_uV < min_uV) { | |
794 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
795 | __func__, name, "min_uV", | |
796 | constraints->min_uV, min_uV); | |
797 | constraints->min_uV = min_uV; | |
798 | } | |
799 | if (constraints->max_uV > max_uV) { | |
800 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
801 | __func__, name, "max_uV", | |
802 | constraints->max_uV, max_uV); | |
803 | constraints->max_uV = max_uV; | |
804 | } | |
805 | } | |
806 | ||
e79055d6 MB |
807 | return 0; |
808 | } | |
809 | ||
810 | /** | |
811 | * set_machine_constraints - sets regulator constraints | |
812 | * @rdev: regulator source | |
813 | * @constraints: constraints to apply | |
814 | * | |
815 | * Allows platform initialisation code to define and constrain | |
816 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
817 | * Constraints *must* be set by platform code in order for some | |
818 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
819 | * set_mode. | |
820 | */ | |
821 | static int set_machine_constraints(struct regulator_dev *rdev, | |
822 | struct regulation_constraints *constraints) | |
823 | { | |
824 | int ret = 0; | |
825 | const char *name; | |
826 | struct regulator_ops *ops = rdev->desc->ops; | |
827 | ||
af5866c9 MB |
828 | rdev->constraints = constraints; |
829 | ||
1083c393 MB |
830 | name = rdev_get_name(rdev); |
831 | ||
832 | ret = machine_constraints_voltage(rdev, constraints); | |
e79055d6 MB |
833 | if (ret != 0) |
834 | goto out; | |
835 | ||
a5766f11 | 836 | /* do we need to setup our suspend state */ |
e06f5b4f | 837 | if (constraints->initial_state) { |
a5766f11 | 838 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
839 | if (ret < 0) { |
840 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
841 | __func__, name); | |
842 | rdev->constraints = NULL; | |
843 | goto out; | |
844 | } | |
845 | } | |
a5766f11 | 846 | |
a308466c MB |
847 | if (constraints->initial_mode) { |
848 | if (!ops->set_mode) { | |
849 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
850 | __func__, name); | |
851 | ret = -EINVAL; | |
852 | goto out; | |
853 | } | |
854 | ||
855 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
856 | if (ret < 0) { | |
857 | printk(KERN_ERR | |
858 | "%s: failed to set initial mode for %s: %d\n", | |
859 | __func__, name, ret); | |
860 | goto out; | |
861 | } | |
862 | } | |
863 | ||
cacf90f2 MB |
864 | /* If the constraints say the regulator should be on at this point |
865 | * and we have control then make sure it is enabled. | |
866 | */ | |
867 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
868 | ret = ops->enable(rdev); |
869 | if (ret < 0) { | |
870 | printk(KERN_ERR "%s: failed to enable %s\n", | |
871 | __func__, name); | |
872 | rdev->constraints = NULL; | |
873 | goto out; | |
874 | } | |
875 | } | |
876 | ||
a5766f11 LG |
877 | print_constraints(rdev); |
878 | out: | |
879 | return ret; | |
880 | } | |
881 | ||
882 | /** | |
883 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
884 | * @rdev: regulator name |
885 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
886 | * |
887 | * Called by platform initialisation code to set the supply regulator for this | |
888 | * regulator. This ensures that a regulators supply will also be enabled by the | |
889 | * core if it's child is enabled. | |
890 | */ | |
891 | static int set_supply(struct regulator_dev *rdev, | |
892 | struct regulator_dev *supply_rdev) | |
893 | { | |
894 | int err; | |
895 | ||
896 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
897 | "supply"); | |
898 | if (err) { | |
899 | printk(KERN_ERR | |
900 | "%s: could not add device link %s err %d\n", | |
901 | __func__, supply_rdev->dev.kobj.name, err); | |
902 | goto out; | |
903 | } | |
904 | rdev->supply = supply_rdev; | |
905 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
906 | out: | |
907 | return err; | |
908 | } | |
909 | ||
910 | /** | |
911 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
912 | * @rdev: regulator source |
913 | * @consumer_dev: device the supply applies to | |
40f9244f | 914 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 915 | * @supply: symbolic name for supply |
a5766f11 LG |
916 | * |
917 | * Allows platform initialisation code to map physical regulator | |
918 | * sources to symbolic names for supplies for use by devices. Devices | |
919 | * should use these symbolic names to request regulators, avoiding the | |
920 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
921 | * |
922 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
923 | */ |
924 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
925 | struct device *consumer_dev, const char *consumer_dev_name, |
926 | const char *supply) | |
a5766f11 LG |
927 | { |
928 | struct regulator_map *node; | |
9ed2099e | 929 | int has_dev; |
a5766f11 | 930 | |
40f9244f MB |
931 | if (consumer_dev && consumer_dev_name) |
932 | return -EINVAL; | |
933 | ||
934 | if (!consumer_dev_name && consumer_dev) | |
935 | consumer_dev_name = dev_name(consumer_dev); | |
936 | ||
a5766f11 LG |
937 | if (supply == NULL) |
938 | return -EINVAL; | |
939 | ||
9ed2099e MB |
940 | if (consumer_dev_name != NULL) |
941 | has_dev = 1; | |
942 | else | |
943 | has_dev = 0; | |
944 | ||
6001e13c | 945 | list_for_each_entry(node, ®ulator_map_list, list) { |
40f9244f | 946 | if (consumer_dev_name != node->dev_name) |
6001e13c DB |
947 | continue; |
948 | if (strcmp(node->supply, supply) != 0) | |
949 | continue; | |
950 | ||
951 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
952 | dev_name(&node->regulator->dev), | |
953 | node->regulator->desc->name, | |
954 | supply, | |
1083c393 | 955 | dev_name(&rdev->dev), rdev_get_name(rdev)); |
6001e13c DB |
956 | return -EBUSY; |
957 | } | |
958 | ||
9ed2099e | 959 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
960 | if (node == NULL) |
961 | return -ENOMEM; | |
962 | ||
963 | node->regulator = rdev; | |
a5766f11 LG |
964 | node->supply = supply; |
965 | ||
9ed2099e MB |
966 | if (has_dev) { |
967 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
968 | if (node->dev_name == NULL) { | |
969 | kfree(node); | |
970 | return -ENOMEM; | |
971 | } | |
40f9244f MB |
972 | } |
973 | ||
a5766f11 LG |
974 | list_add(&node->list, ®ulator_map_list); |
975 | return 0; | |
976 | } | |
977 | ||
978 | static void unset_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f | 979 | const char *consumer_dev_name, struct device *consumer_dev) |
a5766f11 LG |
980 | { |
981 | struct regulator_map *node, *n; | |
982 | ||
40f9244f MB |
983 | if (consumer_dev && !consumer_dev_name) |
984 | consumer_dev_name = dev_name(consumer_dev); | |
985 | ||
a5766f11 | 986 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { |
40f9244f MB |
987 | if (rdev != node->regulator) |
988 | continue; | |
989 | ||
990 | if (consumer_dev_name && node->dev_name && | |
991 | strcmp(consumer_dev_name, node->dev_name)) | |
992 | continue; | |
993 | ||
994 | list_del(&node->list); | |
995 | kfree(node->dev_name); | |
996 | kfree(node); | |
997 | return; | |
a5766f11 LG |
998 | } |
999 | } | |
1000 | ||
0f1d747b MR |
1001 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1002 | { | |
1003 | struct regulator_map *node, *n; | |
1004 | ||
1005 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1006 | if (rdev == node->regulator) { | |
1007 | list_del(&node->list); | |
40f9244f | 1008 | kfree(node->dev_name); |
0f1d747b MR |
1009 | kfree(node); |
1010 | return; | |
1011 | } | |
1012 | } | |
1013 | } | |
1014 | ||
414c70cb LG |
1015 | #define REG_STR_SIZE 32 |
1016 | ||
1017 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1018 | struct device *dev, | |
1019 | const char *supply_name) | |
1020 | { | |
1021 | struct regulator *regulator; | |
1022 | char buf[REG_STR_SIZE]; | |
1023 | int err, size; | |
1024 | ||
1025 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1026 | if (regulator == NULL) | |
1027 | return NULL; | |
1028 | ||
1029 | mutex_lock(&rdev->mutex); | |
1030 | regulator->rdev = rdev; | |
1031 | list_add(®ulator->list, &rdev->consumer_list); | |
1032 | ||
1033 | if (dev) { | |
1034 | /* create a 'requested_microamps_name' sysfs entry */ | |
1035 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1036 | supply_name); | |
1037 | if (size >= REG_STR_SIZE) | |
1038 | goto overflow_err; | |
1039 | ||
1040 | regulator->dev = dev; | |
4f26a2ab | 1041 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1042 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1043 | if (regulator->dev_attr.attr.name == NULL) | |
1044 | goto attr_name_err; | |
1045 | ||
1046 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
1047 | regulator->dev_attr.attr.mode = 0444; | |
1048 | regulator->dev_attr.show = device_requested_uA_show; | |
1049 | err = device_create_file(dev, ®ulator->dev_attr); | |
1050 | if (err < 0) { | |
1051 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
1052 | " load sysfs\n", __func__); | |
1053 | goto attr_name_err; | |
1054 | } | |
1055 | ||
1056 | /* also add a link to the device sysfs entry */ | |
1057 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1058 | dev->kobj.name, supply_name); | |
1059 | if (size >= REG_STR_SIZE) | |
1060 | goto attr_err; | |
1061 | ||
1062 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1063 | if (regulator->supply_name == NULL) | |
1064 | goto attr_err; | |
1065 | ||
1066 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1067 | buf); | |
1068 | if (err) { | |
1069 | printk(KERN_WARNING | |
1070 | "%s: could not add device link %s err %d\n", | |
1071 | __func__, dev->kobj.name, err); | |
1072 | device_remove_file(dev, ®ulator->dev_attr); | |
1073 | goto link_name_err; | |
1074 | } | |
1075 | } | |
1076 | mutex_unlock(&rdev->mutex); | |
1077 | return regulator; | |
1078 | link_name_err: | |
1079 | kfree(regulator->supply_name); | |
1080 | attr_err: | |
1081 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1082 | attr_name_err: | |
1083 | kfree(regulator->dev_attr.attr.name); | |
1084 | overflow_err: | |
1085 | list_del(®ulator->list); | |
1086 | kfree(regulator); | |
1087 | mutex_unlock(&rdev->mutex); | |
1088 | return NULL; | |
1089 | } | |
1090 | ||
31aae2be MB |
1091 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1092 | { | |
1093 | if (!rdev->desc->ops->enable_time) | |
1094 | return 0; | |
1095 | return rdev->desc->ops->enable_time(rdev); | |
1096 | } | |
1097 | ||
5ffbd136 MB |
1098 | /* Internal regulator request function */ |
1099 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1100 | int exclusive) | |
414c70cb LG |
1101 | { |
1102 | struct regulator_dev *rdev; | |
1103 | struct regulator_map *map; | |
1104 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1105 | const char *devname = NULL; |
5ffbd136 | 1106 | int ret; |
414c70cb LG |
1107 | |
1108 | if (id == NULL) { | |
1109 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1110 | return regulator; | |
1111 | } | |
1112 | ||
40f9244f MB |
1113 | if (dev) |
1114 | devname = dev_name(dev); | |
1115 | ||
414c70cb LG |
1116 | mutex_lock(®ulator_list_mutex); |
1117 | ||
1118 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1119 | /* If the mapping has a device set up it must match */ |
1120 | if (map->dev_name && | |
1121 | (!devname || strcmp(map->dev_name, devname))) | |
1122 | continue; | |
1123 | ||
1124 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1125 | rdev = map->regulator; |
414c70cb | 1126 | goto found; |
a5766f11 | 1127 | } |
414c70cb | 1128 | } |
34abbd68 MB |
1129 | |
1130 | #ifdef CONFIG_REGULATOR_DUMMY | |
1131 | if (!devname) | |
1132 | devname = "deviceless"; | |
1133 | ||
1134 | /* If the board didn't flag that it was fully constrained then | |
1135 | * substitute in a dummy regulator so consumers can continue. | |
1136 | */ | |
1137 | if (!has_full_constraints) { | |
1138 | pr_warning("%s supply %s not found, using dummy regulator\n", | |
1139 | devname, id); | |
1140 | rdev = dummy_regulator_rdev; | |
1141 | goto found; | |
1142 | } | |
1143 | #endif | |
1144 | ||
414c70cb LG |
1145 | mutex_unlock(®ulator_list_mutex); |
1146 | return regulator; | |
1147 | ||
1148 | found: | |
5ffbd136 MB |
1149 | if (rdev->exclusive) { |
1150 | regulator = ERR_PTR(-EPERM); | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | if (exclusive && rdev->open_count) { | |
1155 | regulator = ERR_PTR(-EBUSY); | |
1156 | goto out; | |
1157 | } | |
1158 | ||
a5766f11 LG |
1159 | if (!try_module_get(rdev->owner)) |
1160 | goto out; | |
1161 | ||
414c70cb LG |
1162 | regulator = create_regulator(rdev, dev, id); |
1163 | if (regulator == NULL) { | |
1164 | regulator = ERR_PTR(-ENOMEM); | |
1165 | module_put(rdev->owner); | |
1166 | } | |
1167 | ||
5ffbd136 MB |
1168 | rdev->open_count++; |
1169 | if (exclusive) { | |
1170 | rdev->exclusive = 1; | |
1171 | ||
1172 | ret = _regulator_is_enabled(rdev); | |
1173 | if (ret > 0) | |
1174 | rdev->use_count = 1; | |
1175 | else | |
1176 | rdev->use_count = 0; | |
1177 | } | |
1178 | ||
a5766f11 | 1179 | out: |
414c70cb | 1180 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1181 | |
414c70cb LG |
1182 | return regulator; |
1183 | } | |
5ffbd136 MB |
1184 | |
1185 | /** | |
1186 | * regulator_get - lookup and obtain a reference to a regulator. | |
1187 | * @dev: device for regulator "consumer" | |
1188 | * @id: Supply name or regulator ID. | |
1189 | * | |
1190 | * Returns a struct regulator corresponding to the regulator producer, | |
1191 | * or IS_ERR() condition containing errno. | |
1192 | * | |
1193 | * Use of supply names configured via regulator_set_device_supply() is | |
1194 | * strongly encouraged. It is recommended that the supply name used | |
1195 | * should match the name used for the supply and/or the relevant | |
1196 | * device pins in the datasheet. | |
1197 | */ | |
1198 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1199 | { | |
1200 | return _regulator_get(dev, id, 0); | |
1201 | } | |
414c70cb LG |
1202 | EXPORT_SYMBOL_GPL(regulator_get); |
1203 | ||
5ffbd136 MB |
1204 | /** |
1205 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1206 | * @dev: device for regulator "consumer" | |
1207 | * @id: Supply name or regulator ID. | |
1208 | * | |
1209 | * Returns a struct regulator corresponding to the regulator producer, | |
1210 | * or IS_ERR() condition containing errno. Other consumers will be | |
1211 | * unable to obtain this reference is held and the use count for the | |
1212 | * regulator will be initialised to reflect the current state of the | |
1213 | * regulator. | |
1214 | * | |
1215 | * This is intended for use by consumers which cannot tolerate shared | |
1216 | * use of the regulator such as those which need to force the | |
1217 | * regulator off for correct operation of the hardware they are | |
1218 | * controlling. | |
1219 | * | |
1220 | * Use of supply names configured via regulator_set_device_supply() is | |
1221 | * strongly encouraged. It is recommended that the supply name used | |
1222 | * should match the name used for the supply and/or the relevant | |
1223 | * device pins in the datasheet. | |
1224 | */ | |
1225 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1226 | { | |
1227 | return _regulator_get(dev, id, 1); | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1230 | ||
414c70cb LG |
1231 | /** |
1232 | * regulator_put - "free" the regulator source | |
1233 | * @regulator: regulator source | |
1234 | * | |
1235 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1236 | * regulator source are balanced by regulator_disable calls prior to calling | |
1237 | * this function. | |
1238 | */ | |
1239 | void regulator_put(struct regulator *regulator) | |
1240 | { | |
1241 | struct regulator_dev *rdev; | |
1242 | ||
1243 | if (regulator == NULL || IS_ERR(regulator)) | |
1244 | return; | |
1245 | ||
414c70cb LG |
1246 | mutex_lock(®ulator_list_mutex); |
1247 | rdev = regulator->rdev; | |
1248 | ||
1249 | /* remove any sysfs entries */ | |
1250 | if (regulator->dev) { | |
1251 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1252 | kfree(regulator->supply_name); | |
1253 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1254 | kfree(regulator->dev_attr.attr.name); | |
1255 | } | |
1256 | list_del(®ulator->list); | |
1257 | kfree(regulator); | |
1258 | ||
5ffbd136 MB |
1259 | rdev->open_count--; |
1260 | rdev->exclusive = 0; | |
1261 | ||
414c70cb LG |
1262 | module_put(rdev->owner); |
1263 | mutex_unlock(®ulator_list_mutex); | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(regulator_put); | |
1266 | ||
9a2372fa MB |
1267 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1268 | { | |
1269 | if (!rdev->constraints) | |
1270 | return 0; | |
1271 | ||
1272 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1273 | return 1; | |
1274 | else | |
1275 | return 0; | |
1276 | } | |
1277 | ||
414c70cb LG |
1278 | /* locks held by regulator_enable() */ |
1279 | static int _regulator_enable(struct regulator_dev *rdev) | |
1280 | { | |
31aae2be | 1281 | int ret, delay; |
414c70cb LG |
1282 | |
1283 | /* do we need to enable the supply regulator first */ | |
1284 | if (rdev->supply) { | |
1285 | ret = _regulator_enable(rdev->supply); | |
1286 | if (ret < 0) { | |
1287 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1083c393 | 1288 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1289 | return ret; |
1290 | } | |
1291 | } | |
1292 | ||
1293 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1294 | if (rdev->constraints && |
1295 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1296 | drms_uA_update(rdev); | |
414c70cb | 1297 | |
9a2372fa MB |
1298 | if (rdev->use_count == 0) { |
1299 | /* The regulator may on if it's not switchable or left on */ | |
1300 | ret = _regulator_is_enabled(rdev); | |
1301 | if (ret == -EINVAL || ret == 0) { | |
1302 | if (!_regulator_can_change_status(rdev)) | |
1303 | return -EPERM; | |
1304 | ||
31aae2be | 1305 | if (!rdev->desc->ops->enable) |
9a2372fa | 1306 | return -EINVAL; |
31aae2be MB |
1307 | |
1308 | /* Query before enabling in case configuration | |
1309 | * dependant. */ | |
1310 | ret = _regulator_get_enable_time(rdev); | |
1311 | if (ret >= 0) { | |
1312 | delay = ret; | |
1313 | } else { | |
1314 | printk(KERN_WARNING | |
1315 | "%s: enable_time() failed for %s: %d\n", | |
1316 | __func__, rdev_get_name(rdev), | |
1317 | ret); | |
1318 | delay = 0; | |
9a2372fa | 1319 | } |
31aae2be MB |
1320 | |
1321 | /* Allow the regulator to ramp; it would be useful | |
1322 | * to extend this for bulk operations so that the | |
1323 | * regulators can ramp together. */ | |
1324 | ret = rdev->desc->ops->enable(rdev); | |
1325 | if (ret < 0) | |
1326 | return ret; | |
1327 | ||
1328 | if (delay >= 1000) | |
1329 | mdelay(delay / 1000); | |
1330 | else if (delay) | |
1331 | udelay(delay); | |
1332 | ||
a7433cff | 1333 | } else if (ret < 0) { |
9a2372fa | 1334 | printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", |
1083c393 | 1335 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1336 | return ret; |
1337 | } | |
a7433cff | 1338 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1339 | } |
1340 | ||
9a2372fa MB |
1341 | rdev->use_count++; |
1342 | ||
1343 | return 0; | |
414c70cb LG |
1344 | } |
1345 | ||
1346 | /** | |
1347 | * regulator_enable - enable regulator output | |
1348 | * @regulator: regulator source | |
1349 | * | |
cf7bbcdf MB |
1350 | * Request that the regulator be enabled with the regulator output at |
1351 | * the predefined voltage or current value. Calls to regulator_enable() | |
1352 | * must be balanced with calls to regulator_disable(). | |
1353 | * | |
414c70cb | 1354 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1355 | * hardwired in the regulator. |
414c70cb LG |
1356 | */ |
1357 | int regulator_enable(struct regulator *regulator) | |
1358 | { | |
412aec61 DB |
1359 | struct regulator_dev *rdev = regulator->rdev; |
1360 | int ret = 0; | |
414c70cb | 1361 | |
412aec61 | 1362 | mutex_lock(&rdev->mutex); |
cd94b505 | 1363 | ret = _regulator_enable(rdev); |
412aec61 | 1364 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1365 | return ret; |
1366 | } | |
1367 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1368 | ||
1369 | /* locks held by regulator_disable() */ | |
1370 | static int _regulator_disable(struct regulator_dev *rdev) | |
1371 | { | |
1372 | int ret = 0; | |
1373 | ||
cd94b505 DB |
1374 | if (WARN(rdev->use_count <= 0, |
1375 | "unbalanced disables for %s\n", | |
1083c393 | 1376 | rdev_get_name(rdev))) |
cd94b505 DB |
1377 | return -EIO; |
1378 | ||
414c70cb | 1379 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1380 | if (rdev->use_count == 1 && |
1381 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1382 | |
1383 | /* we are last user */ | |
9a2372fa MB |
1384 | if (_regulator_can_change_status(rdev) && |
1385 | rdev->desc->ops->disable) { | |
414c70cb LG |
1386 | ret = rdev->desc->ops->disable(rdev); |
1387 | if (ret < 0) { | |
1388 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1083c393 | 1389 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1390 | return ret; |
1391 | } | |
84b68263 MB |
1392 | |
1393 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1394 | NULL); | |
414c70cb LG |
1395 | } |
1396 | ||
1397 | /* decrease our supplies ref count and disable if required */ | |
1398 | if (rdev->supply) | |
1399 | _regulator_disable(rdev->supply); | |
1400 | ||
1401 | rdev->use_count = 0; | |
1402 | } else if (rdev->use_count > 1) { | |
1403 | ||
1404 | if (rdev->constraints && | |
1405 | (rdev->constraints->valid_ops_mask & | |
1406 | REGULATOR_CHANGE_DRMS)) | |
1407 | drms_uA_update(rdev); | |
1408 | ||
1409 | rdev->use_count--; | |
1410 | } | |
1411 | return ret; | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * regulator_disable - disable regulator output | |
1416 | * @regulator: regulator source | |
1417 | * | |
cf7bbcdf MB |
1418 | * Disable the regulator output voltage or current. Calls to |
1419 | * regulator_enable() must be balanced with calls to | |
1420 | * regulator_disable(). | |
69279fb9 | 1421 | * |
414c70cb | 1422 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1423 | * devices have it enabled, the regulator device supports disabling and |
1424 | * machine constraints permit this operation. | |
414c70cb LG |
1425 | */ |
1426 | int regulator_disable(struct regulator *regulator) | |
1427 | { | |
412aec61 DB |
1428 | struct regulator_dev *rdev = regulator->rdev; |
1429 | int ret = 0; | |
414c70cb | 1430 | |
412aec61 | 1431 | mutex_lock(&rdev->mutex); |
cd94b505 | 1432 | ret = _regulator_disable(rdev); |
412aec61 | 1433 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1434 | return ret; |
1435 | } | |
1436 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1437 | ||
1438 | /* locks held by regulator_force_disable() */ | |
1439 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1440 | { | |
1441 | int ret = 0; | |
1442 | ||
1443 | /* force disable */ | |
1444 | if (rdev->desc->ops->disable) { | |
1445 | /* ah well, who wants to live forever... */ | |
1446 | ret = rdev->desc->ops->disable(rdev); | |
1447 | if (ret < 0) { | |
1448 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1083c393 | 1449 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1450 | return ret; |
1451 | } | |
1452 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1453 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1454 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1455 | } |
1456 | ||
1457 | /* decrease our supplies ref count and disable if required */ | |
1458 | if (rdev->supply) | |
1459 | _regulator_disable(rdev->supply); | |
1460 | ||
1461 | rdev->use_count = 0; | |
1462 | return ret; | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * regulator_force_disable - force disable regulator output | |
1467 | * @regulator: regulator source | |
1468 | * | |
1469 | * Forcibly disable the regulator output voltage or current. | |
1470 | * NOTE: this *will* disable the regulator output even if other consumer | |
1471 | * devices have it enabled. This should be used for situations when device | |
1472 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1473 | */ | |
1474 | int regulator_force_disable(struct regulator *regulator) | |
1475 | { | |
1476 | int ret; | |
1477 | ||
1478 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1479 | regulator->uA_load = 0; |
1480 | ret = _regulator_force_disable(regulator->rdev); | |
1481 | mutex_unlock(®ulator->rdev->mutex); | |
1482 | return ret; | |
1483 | } | |
1484 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1485 | ||
1486 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1487 | { | |
9a7f6a4c | 1488 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1489 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1490 | return 1; |
414c70cb | 1491 | |
9332546f | 1492 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1493 | } |
1494 | ||
1495 | /** | |
1496 | * regulator_is_enabled - is the regulator output enabled | |
1497 | * @regulator: regulator source | |
1498 | * | |
412aec61 DB |
1499 | * Returns positive if the regulator driver backing the source/client |
1500 | * has requested that the device be enabled, zero if it hasn't, else a | |
1501 | * negative errno code. | |
1502 | * | |
1503 | * Note that the device backing this regulator handle can have multiple | |
1504 | * users, so it might be enabled even if regulator_enable() was never | |
1505 | * called for this particular source. | |
414c70cb LG |
1506 | */ |
1507 | int regulator_is_enabled(struct regulator *regulator) | |
1508 | { | |
9332546f MB |
1509 | int ret; |
1510 | ||
1511 | mutex_lock(®ulator->rdev->mutex); | |
1512 | ret = _regulator_is_enabled(regulator->rdev); | |
1513 | mutex_unlock(®ulator->rdev->mutex); | |
1514 | ||
1515 | return ret; | |
414c70cb LG |
1516 | } |
1517 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1518 | ||
4367cfdc DB |
1519 | /** |
1520 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1521 | * @regulator: regulator source | |
1522 | * | |
1523 | * Returns number of selectors, or negative errno. Selectors are | |
1524 | * numbered starting at zero, and typically correspond to bitfields | |
1525 | * in hardware registers. | |
1526 | */ | |
1527 | int regulator_count_voltages(struct regulator *regulator) | |
1528 | { | |
1529 | struct regulator_dev *rdev = regulator->rdev; | |
1530 | ||
1531 | return rdev->desc->n_voltages ? : -EINVAL; | |
1532 | } | |
1533 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1534 | ||
1535 | /** | |
1536 | * regulator_list_voltage - enumerate supported voltages | |
1537 | * @regulator: regulator source | |
1538 | * @selector: identify voltage to list | |
1539 | * Context: can sleep | |
1540 | * | |
1541 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
1542 | * zero if this selector code can't be used on this sytem, or a | |
1543 | * negative errno. | |
1544 | */ | |
1545 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1546 | { | |
1547 | struct regulator_dev *rdev = regulator->rdev; | |
1548 | struct regulator_ops *ops = rdev->desc->ops; | |
1549 | int ret; | |
1550 | ||
1551 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1552 | return -EINVAL; | |
1553 | ||
1554 | mutex_lock(&rdev->mutex); | |
1555 | ret = ops->list_voltage(rdev, selector); | |
1556 | mutex_unlock(&rdev->mutex); | |
1557 | ||
1558 | if (ret > 0) { | |
1559 | if (ret < rdev->constraints->min_uV) | |
1560 | ret = 0; | |
1561 | else if (ret > rdev->constraints->max_uV) | |
1562 | ret = 0; | |
1563 | } | |
1564 | ||
1565 | return ret; | |
1566 | } | |
1567 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1568 | ||
a7a1ad90 MB |
1569 | /** |
1570 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1571 | * | |
1572 | * @regulator: Regulator to check. | |
1573 | * @min_uV: Minimum required voltage in uV. | |
1574 | * @max_uV: Maximum required voltage in uV. | |
1575 | * | |
1576 | * Returns a boolean or a negative error code. | |
1577 | */ | |
1578 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1579 | int min_uV, int max_uV) | |
1580 | { | |
1581 | int i, voltages, ret; | |
1582 | ||
1583 | ret = regulator_count_voltages(regulator); | |
1584 | if (ret < 0) | |
1585 | return ret; | |
1586 | voltages = ret; | |
1587 | ||
1588 | for (i = 0; i < voltages; i++) { | |
1589 | ret = regulator_list_voltage(regulator, i); | |
1590 | ||
1591 | if (ret >= min_uV && ret <= max_uV) | |
1592 | return 1; | |
1593 | } | |
1594 | ||
1595 | return 0; | |
1596 | } | |
1597 | ||
414c70cb LG |
1598 | /** |
1599 | * regulator_set_voltage - set regulator output voltage | |
1600 | * @regulator: regulator source | |
1601 | * @min_uV: Minimum required voltage in uV | |
1602 | * @max_uV: Maximum acceptable voltage in uV | |
1603 | * | |
1604 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1605 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1606 | * | |
1607 | * If the regulator is enabled then the voltage will change to the new value | |
1608 | * immediately otherwise if the regulator is disabled the regulator will | |
1609 | * output at the new voltage when enabled. | |
1610 | * | |
1611 | * NOTE: If the regulator is shared between several devices then the lowest | |
1612 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1613 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1614 | * calling this function otherwise this call will fail. |
1615 | */ | |
1616 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1617 | { | |
1618 | struct regulator_dev *rdev = regulator->rdev; | |
1619 | int ret; | |
1620 | ||
1621 | mutex_lock(&rdev->mutex); | |
1622 | ||
1623 | /* sanity check */ | |
1624 | if (!rdev->desc->ops->set_voltage) { | |
1625 | ret = -EINVAL; | |
1626 | goto out; | |
1627 | } | |
1628 | ||
1629 | /* constraints check */ | |
1630 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1631 | if (ret < 0) | |
1632 | goto out; | |
1633 | regulator->min_uV = min_uV; | |
1634 | regulator->max_uV = max_uV; | |
1635 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1636 | ||
1637 | out: | |
b136fb44 | 1638 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1639 | mutex_unlock(&rdev->mutex); |
1640 | return ret; | |
1641 | } | |
1642 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1643 | ||
1644 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1645 | { | |
1646 | /* sanity check */ | |
1647 | if (rdev->desc->ops->get_voltage) | |
1648 | return rdev->desc->ops->get_voltage(rdev); | |
1649 | else | |
1650 | return -EINVAL; | |
1651 | } | |
1652 | ||
1653 | /** | |
1654 | * regulator_get_voltage - get regulator output voltage | |
1655 | * @regulator: regulator source | |
1656 | * | |
1657 | * This returns the current regulator voltage in uV. | |
1658 | * | |
1659 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1660 | * function should not be used to determine regulator state. | |
1661 | */ | |
1662 | int regulator_get_voltage(struct regulator *regulator) | |
1663 | { | |
1664 | int ret; | |
1665 | ||
1666 | mutex_lock(®ulator->rdev->mutex); | |
1667 | ||
1668 | ret = _regulator_get_voltage(regulator->rdev); | |
1669 | ||
1670 | mutex_unlock(®ulator->rdev->mutex); | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1675 | ||
1676 | /** | |
1677 | * regulator_set_current_limit - set regulator output current limit | |
1678 | * @regulator: regulator source | |
1679 | * @min_uA: Minimuum supported current in uA | |
1680 | * @max_uA: Maximum supported current in uA | |
1681 | * | |
1682 | * Sets current sink to the desired output current. This can be set during | |
1683 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1684 | * | |
1685 | * If the regulator is enabled then the current will change to the new value | |
1686 | * immediately otherwise if the regulator is disabled the regulator will | |
1687 | * output at the new current when enabled. | |
1688 | * | |
1689 | * NOTE: Regulator system constraints must be set for this regulator before | |
1690 | * calling this function otherwise this call will fail. | |
1691 | */ | |
1692 | int regulator_set_current_limit(struct regulator *regulator, | |
1693 | int min_uA, int max_uA) | |
1694 | { | |
1695 | struct regulator_dev *rdev = regulator->rdev; | |
1696 | int ret; | |
1697 | ||
1698 | mutex_lock(&rdev->mutex); | |
1699 | ||
1700 | /* sanity check */ | |
1701 | if (!rdev->desc->ops->set_current_limit) { | |
1702 | ret = -EINVAL; | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | /* constraints check */ | |
1707 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1708 | if (ret < 0) | |
1709 | goto out; | |
1710 | ||
1711 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1712 | out: | |
1713 | mutex_unlock(&rdev->mutex); | |
1714 | return ret; | |
1715 | } | |
1716 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1717 | ||
1718 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1719 | { | |
1720 | int ret; | |
1721 | ||
1722 | mutex_lock(&rdev->mutex); | |
1723 | ||
1724 | /* sanity check */ | |
1725 | if (!rdev->desc->ops->get_current_limit) { | |
1726 | ret = -EINVAL; | |
1727 | goto out; | |
1728 | } | |
1729 | ||
1730 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1731 | out: | |
1732 | mutex_unlock(&rdev->mutex); | |
1733 | return ret; | |
1734 | } | |
1735 | ||
1736 | /** | |
1737 | * regulator_get_current_limit - get regulator output current | |
1738 | * @regulator: regulator source | |
1739 | * | |
1740 | * This returns the current supplied by the specified current sink in uA. | |
1741 | * | |
1742 | * NOTE: If the regulator is disabled it will return the current value. This | |
1743 | * function should not be used to determine regulator state. | |
1744 | */ | |
1745 | int regulator_get_current_limit(struct regulator *regulator) | |
1746 | { | |
1747 | return _regulator_get_current_limit(regulator->rdev); | |
1748 | } | |
1749 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1750 | ||
1751 | /** | |
1752 | * regulator_set_mode - set regulator operating mode | |
1753 | * @regulator: regulator source | |
1754 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1755 | * | |
1756 | * Set regulator operating mode to increase regulator efficiency or improve | |
1757 | * regulation performance. | |
1758 | * | |
1759 | * NOTE: Regulator system constraints must be set for this regulator before | |
1760 | * calling this function otherwise this call will fail. | |
1761 | */ | |
1762 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1763 | { | |
1764 | struct regulator_dev *rdev = regulator->rdev; | |
1765 | int ret; | |
1766 | ||
1767 | mutex_lock(&rdev->mutex); | |
1768 | ||
1769 | /* sanity check */ | |
1770 | if (!rdev->desc->ops->set_mode) { | |
1771 | ret = -EINVAL; | |
1772 | goto out; | |
1773 | } | |
1774 | ||
1775 | /* constraints check */ | |
1776 | ret = regulator_check_mode(rdev, mode); | |
1777 | if (ret < 0) | |
1778 | goto out; | |
1779 | ||
1780 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1781 | out: | |
1782 | mutex_unlock(&rdev->mutex); | |
1783 | return ret; | |
1784 | } | |
1785 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1786 | ||
1787 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1788 | { | |
1789 | int ret; | |
1790 | ||
1791 | mutex_lock(&rdev->mutex); | |
1792 | ||
1793 | /* sanity check */ | |
1794 | if (!rdev->desc->ops->get_mode) { | |
1795 | ret = -EINVAL; | |
1796 | goto out; | |
1797 | } | |
1798 | ||
1799 | ret = rdev->desc->ops->get_mode(rdev); | |
1800 | out: | |
1801 | mutex_unlock(&rdev->mutex); | |
1802 | return ret; | |
1803 | } | |
1804 | ||
1805 | /** | |
1806 | * regulator_get_mode - get regulator operating mode | |
1807 | * @regulator: regulator source | |
1808 | * | |
1809 | * Get the current regulator operating mode. | |
1810 | */ | |
1811 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1812 | { | |
1813 | return _regulator_get_mode(regulator->rdev); | |
1814 | } | |
1815 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1816 | ||
1817 | /** | |
1818 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1819 | * @regulator: regulator source | |
1820 | * @uA_load: load current | |
1821 | * | |
1822 | * Notifies the regulator core of a new device load. This is then used by | |
1823 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1824 | * operating mode for the new regulator loading. | |
1825 | * | |
1826 | * Consumer devices notify their supply regulator of the maximum power | |
1827 | * they will require (can be taken from device datasheet in the power | |
1828 | * consumption tables) when they change operational status and hence power | |
1829 | * state. Examples of operational state changes that can affect power | |
1830 | * consumption are :- | |
1831 | * | |
1832 | * o Device is opened / closed. | |
1833 | * o Device I/O is about to begin or has just finished. | |
1834 | * o Device is idling in between work. | |
1835 | * | |
1836 | * This information is also exported via sysfs to userspace. | |
1837 | * | |
1838 | * DRMS will sum the total requested load on the regulator and change | |
1839 | * to the most efficient operating mode if platform constraints allow. | |
1840 | * | |
1841 | * Returns the new regulator mode or error. | |
1842 | */ | |
1843 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1844 | { | |
1845 | struct regulator_dev *rdev = regulator->rdev; | |
1846 | struct regulator *consumer; | |
1847 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1848 | unsigned int mode; | |
1849 | ||
1850 | mutex_lock(&rdev->mutex); | |
1851 | ||
1852 | regulator->uA_load = uA_load; | |
1853 | ret = regulator_check_drms(rdev); | |
1854 | if (ret < 0) | |
1855 | goto out; | |
1856 | ret = -EINVAL; | |
1857 | ||
1858 | /* sanity check */ | |
1859 | if (!rdev->desc->ops->get_optimum_mode) | |
1860 | goto out; | |
1861 | ||
1862 | /* get output voltage */ | |
1863 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1864 | if (output_uV <= 0) { | |
1865 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1083c393 | 1866 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1867 | goto out; |
1868 | } | |
1869 | ||
1870 | /* get input voltage */ | |
1871 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1872 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1873 | else | |
1874 | input_uV = rdev->constraints->input_uV; | |
1875 | if (input_uV <= 0) { | |
1876 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1083c393 | 1877 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1878 | goto out; |
1879 | } | |
1880 | ||
1881 | /* calc total requested load for this regulator */ | |
1882 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 1883 | total_uA_load += consumer->uA_load; |
414c70cb LG |
1884 | |
1885 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1886 | input_uV, output_uV, | |
1887 | total_uA_load); | |
e573520b DB |
1888 | ret = regulator_check_mode(rdev, mode); |
1889 | if (ret < 0) { | |
414c70cb | 1890 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1083c393 | 1891 | " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), |
414c70cb LG |
1892 | total_uA_load, input_uV, output_uV); |
1893 | goto out; | |
1894 | } | |
1895 | ||
1896 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1897 | if (ret < 0) { |
414c70cb | 1898 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1083c393 | 1899 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
1900 | goto out; |
1901 | } | |
1902 | ret = mode; | |
1903 | out: | |
1904 | mutex_unlock(&rdev->mutex); | |
1905 | return ret; | |
1906 | } | |
1907 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1908 | ||
1909 | /** | |
1910 | * regulator_register_notifier - register regulator event notifier | |
1911 | * @regulator: regulator source | |
69279fb9 | 1912 | * @nb: notifier block |
414c70cb LG |
1913 | * |
1914 | * Register notifier block to receive regulator events. | |
1915 | */ | |
1916 | int regulator_register_notifier(struct regulator *regulator, | |
1917 | struct notifier_block *nb) | |
1918 | { | |
1919 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1920 | nb); | |
1921 | } | |
1922 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1923 | ||
1924 | /** | |
1925 | * regulator_unregister_notifier - unregister regulator event notifier | |
1926 | * @regulator: regulator source | |
69279fb9 | 1927 | * @nb: notifier block |
414c70cb LG |
1928 | * |
1929 | * Unregister regulator event notifier block. | |
1930 | */ | |
1931 | int regulator_unregister_notifier(struct regulator *regulator, | |
1932 | struct notifier_block *nb) | |
1933 | { | |
1934 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1935 | nb); | |
1936 | } | |
1937 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1938 | ||
b136fb44 JC |
1939 | /* notify regulator consumers and downstream regulator consumers. |
1940 | * Note mutex must be held by caller. | |
1941 | */ | |
414c70cb LG |
1942 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1943 | unsigned long event, void *data) | |
1944 | { | |
1945 | struct regulator_dev *_rdev; | |
1946 | ||
1947 | /* call rdev chain first */ | |
414c70cb | 1948 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1949 | |
1950 | /* now notify regulator we supply */ | |
b136fb44 | 1951 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
1952 | mutex_lock(&_rdev->mutex); |
1953 | _notifier_call_chain(_rdev, event, data); | |
1954 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 1955 | } |
414c70cb LG |
1956 | } |
1957 | ||
1958 | /** | |
1959 | * regulator_bulk_get - get multiple regulator consumers | |
1960 | * | |
1961 | * @dev: Device to supply | |
1962 | * @num_consumers: Number of consumers to register | |
1963 | * @consumers: Configuration of consumers; clients are stored here. | |
1964 | * | |
1965 | * @return 0 on success, an errno on failure. | |
1966 | * | |
1967 | * This helper function allows drivers to get several regulator | |
1968 | * consumers in one operation. If any of the regulators cannot be | |
1969 | * acquired then any regulators that were allocated will be freed | |
1970 | * before returning to the caller. | |
1971 | */ | |
1972 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1973 | struct regulator_bulk_data *consumers) | |
1974 | { | |
1975 | int i; | |
1976 | int ret; | |
1977 | ||
1978 | for (i = 0; i < num_consumers; i++) | |
1979 | consumers[i].consumer = NULL; | |
1980 | ||
1981 | for (i = 0; i < num_consumers; i++) { | |
1982 | consumers[i].consumer = regulator_get(dev, | |
1983 | consumers[i].supply); | |
1984 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 1985 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
1986 | dev_err(dev, "Failed to get supply '%s': %d\n", |
1987 | consumers[i].supply, ret); | |
414c70cb LG |
1988 | consumers[i].consumer = NULL; |
1989 | goto err; | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | return 0; | |
1994 | ||
1995 | err: | |
1996 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1997 | regulator_put(consumers[i].consumer); | |
1998 | ||
1999 | return ret; | |
2000 | } | |
2001 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2002 | ||
2003 | /** | |
2004 | * regulator_bulk_enable - enable multiple regulator consumers | |
2005 | * | |
2006 | * @num_consumers: Number of consumers | |
2007 | * @consumers: Consumer data; clients are stored here. | |
2008 | * @return 0 on success, an errno on failure | |
2009 | * | |
2010 | * This convenience API allows consumers to enable multiple regulator | |
2011 | * clients in a single API call. If any consumers cannot be enabled | |
2012 | * then any others that were enabled will be disabled again prior to | |
2013 | * return. | |
2014 | */ | |
2015 | int regulator_bulk_enable(int num_consumers, | |
2016 | struct regulator_bulk_data *consumers) | |
2017 | { | |
2018 | int i; | |
2019 | int ret; | |
2020 | ||
2021 | for (i = 0; i < num_consumers; i++) { | |
2022 | ret = regulator_enable(consumers[i].consumer); | |
2023 | if (ret != 0) | |
2024 | goto err; | |
2025 | } | |
2026 | ||
2027 | return 0; | |
2028 | ||
2029 | err: | |
5b307627 | 2030 | printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2031 | for (--i; i >= 0; --i) |
414c70cb LG |
2032 | regulator_disable(consumers[i].consumer); |
2033 | ||
2034 | return ret; | |
2035 | } | |
2036 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2037 | ||
2038 | /** | |
2039 | * regulator_bulk_disable - disable multiple regulator consumers | |
2040 | * | |
2041 | * @num_consumers: Number of consumers | |
2042 | * @consumers: Consumer data; clients are stored here. | |
2043 | * @return 0 on success, an errno on failure | |
2044 | * | |
2045 | * This convenience API allows consumers to disable multiple regulator | |
2046 | * clients in a single API call. If any consumers cannot be enabled | |
2047 | * then any others that were disabled will be disabled again prior to | |
2048 | * return. | |
2049 | */ | |
2050 | int regulator_bulk_disable(int num_consumers, | |
2051 | struct regulator_bulk_data *consumers) | |
2052 | { | |
2053 | int i; | |
2054 | int ret; | |
2055 | ||
2056 | for (i = 0; i < num_consumers; i++) { | |
2057 | ret = regulator_disable(consumers[i].consumer); | |
2058 | if (ret != 0) | |
2059 | goto err; | |
2060 | } | |
2061 | ||
2062 | return 0; | |
2063 | ||
2064 | err: | |
5b307627 MB |
2065 | printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, |
2066 | ret); | |
eb143ac1 | 2067 | for (--i; i >= 0; --i) |
414c70cb LG |
2068 | regulator_enable(consumers[i].consumer); |
2069 | ||
2070 | return ret; | |
2071 | } | |
2072 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2073 | ||
2074 | /** | |
2075 | * regulator_bulk_free - free multiple regulator consumers | |
2076 | * | |
2077 | * @num_consumers: Number of consumers | |
2078 | * @consumers: Consumer data; clients are stored here. | |
2079 | * | |
2080 | * This convenience API allows consumers to free multiple regulator | |
2081 | * clients in a single API call. | |
2082 | */ | |
2083 | void regulator_bulk_free(int num_consumers, | |
2084 | struct regulator_bulk_data *consumers) | |
2085 | { | |
2086 | int i; | |
2087 | ||
2088 | for (i = 0; i < num_consumers; i++) { | |
2089 | regulator_put(consumers[i].consumer); | |
2090 | consumers[i].consumer = NULL; | |
2091 | } | |
2092 | } | |
2093 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2094 | ||
2095 | /** | |
2096 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2097 | * @rdev: regulator source |
414c70cb | 2098 | * @event: notifier block |
69279fb9 | 2099 | * @data: callback-specific data. |
414c70cb LG |
2100 | * |
2101 | * Called by regulator drivers to notify clients a regulator event has | |
2102 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2103 | * Note lock must be held by caller. |
414c70cb LG |
2104 | */ |
2105 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2106 | unsigned long event, void *data) | |
2107 | { | |
2108 | _notifier_call_chain(rdev, event, data); | |
2109 | return NOTIFY_DONE; | |
2110 | ||
2111 | } | |
2112 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2113 | ||
be721979 MB |
2114 | /** |
2115 | * regulator_mode_to_status - convert a regulator mode into a status | |
2116 | * | |
2117 | * @mode: Mode to convert | |
2118 | * | |
2119 | * Convert a regulator mode into a status. | |
2120 | */ | |
2121 | int regulator_mode_to_status(unsigned int mode) | |
2122 | { | |
2123 | switch (mode) { | |
2124 | case REGULATOR_MODE_FAST: | |
2125 | return REGULATOR_STATUS_FAST; | |
2126 | case REGULATOR_MODE_NORMAL: | |
2127 | return REGULATOR_STATUS_NORMAL; | |
2128 | case REGULATOR_MODE_IDLE: | |
2129 | return REGULATOR_STATUS_IDLE; | |
2130 | case REGULATOR_STATUS_STANDBY: | |
2131 | return REGULATOR_STATUS_STANDBY; | |
2132 | default: | |
2133 | return 0; | |
2134 | } | |
2135 | } | |
2136 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2137 | ||
7ad68e2f DB |
2138 | /* |
2139 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2140 | * create attributes that can be meaningfully displayed. | |
2141 | */ | |
2142 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2143 | { | |
2144 | struct device *dev = &rdev->dev; | |
2145 | struct regulator_ops *ops = rdev->desc->ops; | |
2146 | int status = 0; | |
2147 | ||
2148 | /* some attributes need specific methods to be displayed */ | |
2149 | if (ops->get_voltage) { | |
2150 | status = device_create_file(dev, &dev_attr_microvolts); | |
2151 | if (status < 0) | |
2152 | return status; | |
2153 | } | |
2154 | if (ops->get_current_limit) { | |
2155 | status = device_create_file(dev, &dev_attr_microamps); | |
2156 | if (status < 0) | |
2157 | return status; | |
2158 | } | |
2159 | if (ops->get_mode) { | |
2160 | status = device_create_file(dev, &dev_attr_opmode); | |
2161 | if (status < 0) | |
2162 | return status; | |
2163 | } | |
2164 | if (ops->is_enabled) { | |
2165 | status = device_create_file(dev, &dev_attr_state); | |
2166 | if (status < 0) | |
2167 | return status; | |
2168 | } | |
853116a1 DB |
2169 | if (ops->get_status) { |
2170 | status = device_create_file(dev, &dev_attr_status); | |
2171 | if (status < 0) | |
2172 | return status; | |
2173 | } | |
7ad68e2f DB |
2174 | |
2175 | /* some attributes are type-specific */ | |
2176 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2177 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2178 | if (status < 0) | |
2179 | return status; | |
2180 | } | |
2181 | ||
2182 | /* all the other attributes exist to support constraints; | |
2183 | * don't show them if there are no constraints, or if the | |
2184 | * relevant supporting methods are missing. | |
2185 | */ | |
2186 | if (!rdev->constraints) | |
2187 | return status; | |
2188 | ||
2189 | /* constraints need specific supporting methods */ | |
2190 | if (ops->set_voltage) { | |
2191 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2192 | if (status < 0) | |
2193 | return status; | |
2194 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2195 | if (status < 0) | |
2196 | return status; | |
2197 | } | |
2198 | if (ops->set_current_limit) { | |
2199 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2200 | if (status < 0) | |
2201 | return status; | |
2202 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2203 | if (status < 0) | |
2204 | return status; | |
2205 | } | |
2206 | ||
2207 | /* suspend mode constraints need multiple supporting methods */ | |
2208 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2209 | return status; | |
2210 | ||
2211 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2212 | if (status < 0) | |
2213 | return status; | |
2214 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2215 | if (status < 0) | |
2216 | return status; | |
2217 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2218 | if (status < 0) | |
2219 | return status; | |
2220 | ||
2221 | if (ops->set_suspend_voltage) { | |
2222 | status = device_create_file(dev, | |
2223 | &dev_attr_suspend_standby_microvolts); | |
2224 | if (status < 0) | |
2225 | return status; | |
2226 | status = device_create_file(dev, | |
2227 | &dev_attr_suspend_mem_microvolts); | |
2228 | if (status < 0) | |
2229 | return status; | |
2230 | status = device_create_file(dev, | |
2231 | &dev_attr_suspend_disk_microvolts); | |
2232 | if (status < 0) | |
2233 | return status; | |
2234 | } | |
2235 | ||
2236 | if (ops->set_suspend_mode) { | |
2237 | status = device_create_file(dev, | |
2238 | &dev_attr_suspend_standby_mode); | |
2239 | if (status < 0) | |
2240 | return status; | |
2241 | status = device_create_file(dev, | |
2242 | &dev_attr_suspend_mem_mode); | |
2243 | if (status < 0) | |
2244 | return status; | |
2245 | status = device_create_file(dev, | |
2246 | &dev_attr_suspend_disk_mode); | |
2247 | if (status < 0) | |
2248 | return status; | |
2249 | } | |
2250 | ||
2251 | return status; | |
2252 | } | |
2253 | ||
414c70cb LG |
2254 | /** |
2255 | * regulator_register - register regulator | |
69279fb9 MB |
2256 | * @regulator_desc: regulator to register |
2257 | * @dev: struct device for the regulator | |
0527100f | 2258 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2259 | * @driver_data: private regulator data |
414c70cb LG |
2260 | * |
2261 | * Called by regulator drivers to register a regulator. | |
2262 | * Returns 0 on success. | |
2263 | */ | |
2264 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
2265 | struct device *dev, struct regulator_init_data *init_data, |
2266 | void *driver_data) | |
414c70cb LG |
2267 | { |
2268 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2269 | struct regulator_dev *rdev; | |
a5766f11 | 2270 | int ret, i; |
414c70cb LG |
2271 | |
2272 | if (regulator_desc == NULL) | |
2273 | return ERR_PTR(-EINVAL); | |
2274 | ||
2275 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2276 | return ERR_PTR(-EINVAL); | |
2277 | ||
cd78dfc6 DL |
2278 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2279 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2280 | return ERR_PTR(-EINVAL); |
2281 | ||
46fabe1e MB |
2282 | if (!init_data) |
2283 | return ERR_PTR(-EINVAL); | |
2284 | ||
414c70cb LG |
2285 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2286 | if (rdev == NULL) | |
2287 | return ERR_PTR(-ENOMEM); | |
2288 | ||
2289 | mutex_lock(®ulator_list_mutex); | |
2290 | ||
2291 | mutex_init(&rdev->mutex); | |
a5766f11 | 2292 | rdev->reg_data = driver_data; |
414c70cb LG |
2293 | rdev->owner = regulator_desc->owner; |
2294 | rdev->desc = regulator_desc; | |
2295 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2296 | INIT_LIST_HEAD(&rdev->supply_list); | |
2297 | INIT_LIST_HEAD(&rdev->list); | |
2298 | INIT_LIST_HEAD(&rdev->slist); | |
2299 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2300 | ||
a5766f11 LG |
2301 | /* preform any regulator specific init */ |
2302 | if (init_data->regulator_init) { | |
2303 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2304 | if (ret < 0) |
2305 | goto clean; | |
a5766f11 LG |
2306 | } |
2307 | ||
a5766f11 | 2308 | /* register with sysfs */ |
414c70cb | 2309 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2310 | rdev->dev.parent = dev; |
812460a9 KS |
2311 | dev_set_name(&rdev->dev, "regulator.%d", |
2312 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2313 | ret = device_register(&rdev->dev); |
4fca9545 DB |
2314 | if (ret != 0) |
2315 | goto clean; | |
a5766f11 LG |
2316 | |
2317 | dev_set_drvdata(&rdev->dev, rdev); | |
2318 | ||
74f544c1 MR |
2319 | /* set regulator constraints */ |
2320 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2321 | if (ret < 0) | |
2322 | goto scrub; | |
2323 | ||
7ad68e2f DB |
2324 | /* add attributes supported by this regulator */ |
2325 | ret = add_regulator_attributes(rdev); | |
2326 | if (ret < 0) | |
2327 | goto scrub; | |
2328 | ||
a5766f11 LG |
2329 | /* set supply regulator if it exists */ |
2330 | if (init_data->supply_regulator_dev) { | |
2331 | ret = set_supply(rdev, | |
2332 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2333 | if (ret < 0) |
2334 | goto scrub; | |
a5766f11 LG |
2335 | } |
2336 | ||
2337 | /* add consumers devices */ | |
2338 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2339 | ret = set_consumer_device_supply(rdev, | |
2340 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2341 | init_data->consumer_supplies[i].dev_name, |
a5766f11 LG |
2342 | init_data->consumer_supplies[i].supply); |
2343 | if (ret < 0) { | |
2344 | for (--i; i >= 0; i--) | |
2345 | unset_consumer_device_supply(rdev, | |
40f9244f MB |
2346 | init_data->consumer_supplies[i].dev_name, |
2347 | init_data->consumer_supplies[i].dev); | |
4fca9545 | 2348 | goto scrub; |
a5766f11 | 2349 | } |
414c70cb | 2350 | } |
a5766f11 LG |
2351 | |
2352 | list_add(&rdev->list, ®ulator_list); | |
2353 | out: | |
414c70cb LG |
2354 | mutex_unlock(®ulator_list_mutex); |
2355 | return rdev; | |
4fca9545 DB |
2356 | |
2357 | scrub: | |
2358 | device_unregister(&rdev->dev); | |
53032daf PW |
2359 | /* device core frees rdev */ |
2360 | rdev = ERR_PTR(ret); | |
2361 | goto out; | |
2362 | ||
4fca9545 DB |
2363 | clean: |
2364 | kfree(rdev); | |
2365 | rdev = ERR_PTR(ret); | |
2366 | goto out; | |
414c70cb LG |
2367 | } |
2368 | EXPORT_SYMBOL_GPL(regulator_register); | |
2369 | ||
2370 | /** | |
2371 | * regulator_unregister - unregister regulator | |
69279fb9 | 2372 | * @rdev: regulator to unregister |
414c70cb LG |
2373 | * |
2374 | * Called by regulator drivers to unregister a regulator. | |
2375 | */ | |
2376 | void regulator_unregister(struct regulator_dev *rdev) | |
2377 | { | |
2378 | if (rdev == NULL) | |
2379 | return; | |
2380 | ||
2381 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2382 | WARN_ON(rdev->open_count); |
0f1d747b | 2383 | unset_regulator_supplies(rdev); |
414c70cb LG |
2384 | list_del(&rdev->list); |
2385 | if (rdev->supply) | |
2386 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2387 | device_unregister(&rdev->dev); | |
2388 | mutex_unlock(®ulator_list_mutex); | |
2389 | } | |
2390 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2391 | ||
414c70cb | 2392 | /** |
cf7bbcdf | 2393 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2394 | * @state: system suspend state |
2395 | * | |
2396 | * Configure each regulator with it's suspend operating parameters for state. | |
2397 | * This will usually be called by machine suspend code prior to supending. | |
2398 | */ | |
2399 | int regulator_suspend_prepare(suspend_state_t state) | |
2400 | { | |
2401 | struct regulator_dev *rdev; | |
2402 | int ret = 0; | |
2403 | ||
2404 | /* ON is handled by regulator active state */ | |
2405 | if (state == PM_SUSPEND_ON) | |
2406 | return -EINVAL; | |
2407 | ||
2408 | mutex_lock(®ulator_list_mutex); | |
2409 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2410 | ||
2411 | mutex_lock(&rdev->mutex); | |
2412 | ret = suspend_prepare(rdev, state); | |
2413 | mutex_unlock(&rdev->mutex); | |
2414 | ||
2415 | if (ret < 0) { | |
2416 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1083c393 | 2417 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
2418 | goto out; |
2419 | } | |
2420 | } | |
2421 | out: | |
2422 | mutex_unlock(®ulator_list_mutex); | |
2423 | return ret; | |
2424 | } | |
2425 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2426 | ||
ca725561 MB |
2427 | /** |
2428 | * regulator_has_full_constraints - the system has fully specified constraints | |
2429 | * | |
2430 | * Calling this function will cause the regulator API to disable all | |
2431 | * regulators which have a zero use count and don't have an always_on | |
2432 | * constraint in a late_initcall. | |
2433 | * | |
2434 | * The intention is that this will become the default behaviour in a | |
2435 | * future kernel release so users are encouraged to use this facility | |
2436 | * now. | |
2437 | */ | |
2438 | void regulator_has_full_constraints(void) | |
2439 | { | |
2440 | has_full_constraints = 1; | |
2441 | } | |
2442 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2443 | ||
414c70cb LG |
2444 | /** |
2445 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2446 | * @rdev: regulator |
414c70cb LG |
2447 | * |
2448 | * Get rdev regulator driver private data. This call can be used in the | |
2449 | * regulator driver context. | |
2450 | */ | |
2451 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2452 | { | |
2453 | return rdev->reg_data; | |
2454 | } | |
2455 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2456 | ||
2457 | /** | |
2458 | * regulator_get_drvdata - get regulator driver data | |
2459 | * @regulator: regulator | |
2460 | * | |
2461 | * Get regulator driver private data. This call can be used in the consumer | |
2462 | * driver context when non API regulator specific functions need to be called. | |
2463 | */ | |
2464 | void *regulator_get_drvdata(struct regulator *regulator) | |
2465 | { | |
2466 | return regulator->rdev->reg_data; | |
2467 | } | |
2468 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2469 | ||
2470 | /** | |
2471 | * regulator_set_drvdata - set regulator driver data | |
2472 | * @regulator: regulator | |
2473 | * @data: data | |
2474 | */ | |
2475 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2476 | { | |
2477 | regulator->rdev->reg_data = data; | |
2478 | } | |
2479 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2480 | ||
2481 | /** | |
2482 | * regulator_get_id - get regulator ID | |
69279fb9 | 2483 | * @rdev: regulator |
414c70cb LG |
2484 | */ |
2485 | int rdev_get_id(struct regulator_dev *rdev) | |
2486 | { | |
2487 | return rdev->desc->id; | |
2488 | } | |
2489 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2490 | ||
a5766f11 LG |
2491 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2492 | { | |
2493 | return &rdev->dev; | |
2494 | } | |
2495 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2496 | ||
2497 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2498 | { | |
2499 | return reg_init_data->driver_data; | |
2500 | } | |
2501 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2502 | ||
414c70cb LG |
2503 | static int __init regulator_init(void) |
2504 | { | |
34abbd68 MB |
2505 | int ret; |
2506 | ||
414c70cb | 2507 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); |
34abbd68 MB |
2508 | |
2509 | ret = class_register(®ulator_class); | |
2510 | ||
2511 | regulator_dummy_init(); | |
2512 | ||
2513 | return ret; | |
414c70cb LG |
2514 | } |
2515 | ||
2516 | /* init early to allow our consumers to complete system booting */ | |
2517 | core_initcall(regulator_init); | |
ca725561 MB |
2518 | |
2519 | static int __init regulator_init_complete(void) | |
2520 | { | |
2521 | struct regulator_dev *rdev; | |
2522 | struct regulator_ops *ops; | |
2523 | struct regulation_constraints *c; | |
2524 | int enabled, ret; | |
2525 | const char *name; | |
2526 | ||
2527 | mutex_lock(®ulator_list_mutex); | |
2528 | ||
2529 | /* If we have a full configuration then disable any regulators | |
2530 | * which are not in use or always_on. This will become the | |
2531 | * default behaviour in the future. | |
2532 | */ | |
2533 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2534 | ops = rdev->desc->ops; | |
2535 | c = rdev->constraints; | |
2536 | ||
1083c393 | 2537 | name = rdev_get_name(rdev); |
ca725561 | 2538 | |
f25e0b4f | 2539 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2540 | continue; |
2541 | ||
2542 | mutex_lock(&rdev->mutex); | |
2543 | ||
2544 | if (rdev->use_count) | |
2545 | goto unlock; | |
2546 | ||
2547 | /* If we can't read the status assume it's on. */ | |
2548 | if (ops->is_enabled) | |
2549 | enabled = ops->is_enabled(rdev); | |
2550 | else | |
2551 | enabled = 1; | |
2552 | ||
2553 | if (!enabled) | |
2554 | goto unlock; | |
2555 | ||
2556 | if (has_full_constraints) { | |
2557 | /* We log since this may kill the system if it | |
2558 | * goes wrong. */ | |
2559 | printk(KERN_INFO "%s: disabling %s\n", | |
2560 | __func__, name); | |
2561 | ret = ops->disable(rdev); | |
2562 | if (ret != 0) { | |
2563 | printk(KERN_ERR | |
2564 | "%s: couldn't disable %s: %d\n", | |
2565 | __func__, name, ret); | |
2566 | } | |
2567 | } else { | |
2568 | /* The intention is that in future we will | |
2569 | * assume that full constraints are provided | |
2570 | * so warn even if we aren't going to do | |
2571 | * anything here. | |
2572 | */ | |
2573 | printk(KERN_WARNING | |
2574 | "%s: incomplete constraints, leaving %s on\n", | |
2575 | __func__, name); | |
2576 | } | |
2577 | ||
2578 | unlock: | |
2579 | mutex_unlock(&rdev->mutex); | |
2580 | } | |
2581 | ||
2582 | mutex_unlock(®ulator_list_mutex); | |
2583 | ||
2584 | return 0; | |
2585 | } | |
2586 | late_initcall(regulator_init_complete); |