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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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
414c70cb LG |
20 | #include <linux/err.h> |
21 | #include <linux/mutex.h> | |
22 | #include <linux/suspend.h> | |
31aae2be | 23 | #include <linux/delay.h> |
414c70cb LG |
24 | #include <linux/regulator/consumer.h> |
25 | #include <linux/regulator/driver.h> | |
26 | #include <linux/regulator/machine.h> | |
27 | ||
34abbd68 MB |
28 | #include "dummy.h" |
29 | ||
414c70cb LG |
30 | #define REGULATOR_VERSION "0.5" |
31 | ||
32 | static DEFINE_MUTEX(regulator_list_mutex); | |
33 | static LIST_HEAD(regulator_list); | |
34 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 35 | static int has_full_constraints; |
688fe99a | 36 | static bool board_wants_dummy_regulator; |
414c70cb | 37 | |
8dc5390d | 38 | /* |
414c70cb LG |
39 | * struct regulator_map |
40 | * | |
41 | * Used to provide symbolic supply names to devices. | |
42 | */ | |
43 | struct regulator_map { | |
44 | struct list_head list; | |
40f9244f | 45 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 46 | const char *supply; |
a5766f11 | 47 | struct regulator_dev *regulator; |
414c70cb LG |
48 | }; |
49 | ||
414c70cb LG |
50 | /* |
51 | * struct regulator | |
52 | * | |
53 | * One for each consumer device. | |
54 | */ | |
55 | struct regulator { | |
56 | struct device *dev; | |
57 | struct list_head list; | |
58 | int uA_load; | |
59 | int min_uV; | |
60 | int max_uV; | |
414c70cb LG |
61 | char *supply_name; |
62 | struct device_attribute dev_attr; | |
63 | struct regulator_dev *rdev; | |
64 | }; | |
65 | ||
66 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
67 | static int _regulator_disable(struct regulator_dev *rdev); | |
68 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
69 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
70 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
71 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
72 | unsigned long event, void *data); | |
73 | ||
1083c393 MB |
74 | static const char *rdev_get_name(struct regulator_dev *rdev) |
75 | { | |
76 | if (rdev->constraints && rdev->constraints->name) | |
77 | return rdev->constraints->name; | |
78 | else if (rdev->desc->name) | |
79 | return rdev->desc->name; | |
80 | else | |
81 | return ""; | |
82 | } | |
83 | ||
414c70cb LG |
84 | /* gets the regulator for a given consumer device */ |
85 | static struct regulator *get_device_regulator(struct device *dev) | |
86 | { | |
87 | struct regulator *regulator = NULL; | |
88 | struct regulator_dev *rdev; | |
89 | ||
90 | mutex_lock(®ulator_list_mutex); | |
91 | list_for_each_entry(rdev, ®ulator_list, list) { | |
92 | mutex_lock(&rdev->mutex); | |
93 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
94 | if (regulator->dev == dev) { | |
95 | mutex_unlock(&rdev->mutex); | |
96 | mutex_unlock(®ulator_list_mutex); | |
97 | return regulator; | |
98 | } | |
99 | } | |
100 | mutex_unlock(&rdev->mutex); | |
101 | } | |
102 | mutex_unlock(®ulator_list_mutex); | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | /* Platform voltage constraint check */ | |
107 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
108 | int *min_uV, int *max_uV) | |
109 | { | |
110 | BUG_ON(*min_uV > *max_uV); | |
111 | ||
112 | if (!rdev->constraints) { | |
113 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 114 | rdev_get_name(rdev)); |
414c70cb LG |
115 | return -ENODEV; |
116 | } | |
117 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
118 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 119 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
120 | return -EPERM; |
121 | } | |
122 | ||
123 | if (*max_uV > rdev->constraints->max_uV) | |
124 | *max_uV = rdev->constraints->max_uV; | |
125 | if (*min_uV < rdev->constraints->min_uV) | |
126 | *min_uV = rdev->constraints->min_uV; | |
127 | ||
128 | if (*min_uV > *max_uV) | |
129 | return -EINVAL; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | /* current constraint check */ | |
135 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
136 | int *min_uA, int *max_uA) | |
137 | { | |
138 | BUG_ON(*min_uA > *max_uA); | |
139 | ||
140 | if (!rdev->constraints) { | |
141 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 142 | rdev_get_name(rdev)); |
414c70cb LG |
143 | return -ENODEV; |
144 | } | |
145 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
146 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 147 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
148 | return -EPERM; |
149 | } | |
150 | ||
151 | if (*max_uA > rdev->constraints->max_uA) | |
152 | *max_uA = rdev->constraints->max_uA; | |
153 | if (*min_uA < rdev->constraints->min_uA) | |
154 | *min_uA = rdev->constraints->min_uA; | |
155 | ||
156 | if (*min_uA > *max_uA) | |
157 | return -EINVAL; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | /* operating mode constraint check */ | |
163 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
164 | { | |
e573520b DB |
165 | switch (mode) { |
166 | case REGULATOR_MODE_FAST: | |
167 | case REGULATOR_MODE_NORMAL: | |
168 | case REGULATOR_MODE_IDLE: | |
169 | case REGULATOR_MODE_STANDBY: | |
170 | break; | |
171 | default: | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
414c70cb LG |
175 | if (!rdev->constraints) { |
176 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 177 | rdev_get_name(rdev)); |
414c70cb LG |
178 | return -ENODEV; |
179 | } | |
180 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
181 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 182 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
183 | return -EPERM; |
184 | } | |
185 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
186 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
1083c393 | 187 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
188 | return -EINVAL; |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | /* dynamic regulator mode switching constraint check */ | |
194 | static int regulator_check_drms(struct regulator_dev *rdev) | |
195 | { | |
196 | if (!rdev->constraints) { | |
197 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 198 | rdev_get_name(rdev)); |
414c70cb LG |
199 | return -ENODEV; |
200 | } | |
201 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
202 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 203 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
204 | return -EPERM; |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static ssize_t device_requested_uA_show(struct device *dev, | |
210 | struct device_attribute *attr, char *buf) | |
211 | { | |
212 | struct regulator *regulator; | |
213 | ||
214 | regulator = get_device_regulator(dev); | |
215 | if (regulator == NULL) | |
216 | return 0; | |
217 | ||
218 | return sprintf(buf, "%d\n", regulator->uA_load); | |
219 | } | |
220 | ||
221 | static ssize_t regulator_uV_show(struct device *dev, | |
222 | struct device_attribute *attr, char *buf) | |
223 | { | |
a5766f11 | 224 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
225 | ssize_t ret; |
226 | ||
227 | mutex_lock(&rdev->mutex); | |
228 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
229 | mutex_unlock(&rdev->mutex); | |
230 | ||
231 | return ret; | |
232 | } | |
7ad68e2f | 233 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
234 | |
235 | static ssize_t regulator_uA_show(struct device *dev, | |
236 | struct device_attribute *attr, char *buf) | |
237 | { | |
a5766f11 | 238 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
239 | |
240 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
241 | } | |
7ad68e2f | 242 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 243 | |
bc558a60 MB |
244 | static ssize_t regulator_name_show(struct device *dev, |
245 | struct device_attribute *attr, char *buf) | |
246 | { | |
247 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 248 | |
1083c393 | 249 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
250 | } |
251 | ||
4fca9545 | 252 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 253 | { |
414c70cb LG |
254 | switch (mode) { |
255 | case REGULATOR_MODE_FAST: | |
256 | return sprintf(buf, "fast\n"); | |
257 | case REGULATOR_MODE_NORMAL: | |
258 | return sprintf(buf, "normal\n"); | |
259 | case REGULATOR_MODE_IDLE: | |
260 | return sprintf(buf, "idle\n"); | |
261 | case REGULATOR_MODE_STANDBY: | |
262 | return sprintf(buf, "standby\n"); | |
263 | } | |
264 | return sprintf(buf, "unknown\n"); | |
265 | } | |
266 | ||
4fca9545 DB |
267 | static ssize_t regulator_opmode_show(struct device *dev, |
268 | struct device_attribute *attr, char *buf) | |
414c70cb | 269 | { |
a5766f11 | 270 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 271 | |
4fca9545 DB |
272 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
273 | } | |
7ad68e2f | 274 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
275 | |
276 | static ssize_t regulator_print_state(char *buf, int state) | |
277 | { | |
414c70cb LG |
278 | if (state > 0) |
279 | return sprintf(buf, "enabled\n"); | |
280 | else if (state == 0) | |
281 | return sprintf(buf, "disabled\n"); | |
282 | else | |
283 | return sprintf(buf, "unknown\n"); | |
284 | } | |
285 | ||
4fca9545 DB |
286 | static ssize_t regulator_state_show(struct device *dev, |
287 | struct device_attribute *attr, char *buf) | |
288 | { | |
289 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
290 | ssize_t ret; |
291 | ||
292 | mutex_lock(&rdev->mutex); | |
293 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
294 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 295 | |
9332546f | 296 | return ret; |
4fca9545 | 297 | } |
7ad68e2f | 298 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 299 | |
853116a1 DB |
300 | static ssize_t regulator_status_show(struct device *dev, |
301 | struct device_attribute *attr, char *buf) | |
302 | { | |
303 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
304 | int status; | |
305 | char *label; | |
306 | ||
307 | status = rdev->desc->ops->get_status(rdev); | |
308 | if (status < 0) | |
309 | return status; | |
310 | ||
311 | switch (status) { | |
312 | case REGULATOR_STATUS_OFF: | |
313 | label = "off"; | |
314 | break; | |
315 | case REGULATOR_STATUS_ON: | |
316 | label = "on"; | |
317 | break; | |
318 | case REGULATOR_STATUS_ERROR: | |
319 | label = "error"; | |
320 | break; | |
321 | case REGULATOR_STATUS_FAST: | |
322 | label = "fast"; | |
323 | break; | |
324 | case REGULATOR_STATUS_NORMAL: | |
325 | label = "normal"; | |
326 | break; | |
327 | case REGULATOR_STATUS_IDLE: | |
328 | label = "idle"; | |
329 | break; | |
330 | case REGULATOR_STATUS_STANDBY: | |
331 | label = "standby"; | |
332 | break; | |
333 | default: | |
334 | return -ERANGE; | |
335 | } | |
336 | ||
337 | return sprintf(buf, "%s\n", label); | |
338 | } | |
339 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
340 | ||
414c70cb LG |
341 | static ssize_t regulator_min_uA_show(struct device *dev, |
342 | struct device_attribute *attr, char *buf) | |
343 | { | |
a5766f11 | 344 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
345 | |
346 | if (!rdev->constraints) | |
347 | return sprintf(buf, "constraint not defined\n"); | |
348 | ||
349 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
350 | } | |
7ad68e2f | 351 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
352 | |
353 | static ssize_t regulator_max_uA_show(struct device *dev, | |
354 | struct device_attribute *attr, char *buf) | |
355 | { | |
a5766f11 | 356 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
357 | |
358 | if (!rdev->constraints) | |
359 | return sprintf(buf, "constraint not defined\n"); | |
360 | ||
361 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
362 | } | |
7ad68e2f | 363 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
364 | |
365 | static ssize_t regulator_min_uV_show(struct device *dev, | |
366 | struct device_attribute *attr, char *buf) | |
367 | { | |
a5766f11 | 368 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
369 | |
370 | if (!rdev->constraints) | |
371 | return sprintf(buf, "constraint not defined\n"); | |
372 | ||
373 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
374 | } | |
7ad68e2f | 375 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
376 | |
377 | static ssize_t regulator_max_uV_show(struct device *dev, | |
378 | struct device_attribute *attr, char *buf) | |
379 | { | |
a5766f11 | 380 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
381 | |
382 | if (!rdev->constraints) | |
383 | return sprintf(buf, "constraint not defined\n"); | |
384 | ||
385 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
386 | } | |
7ad68e2f | 387 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
388 | |
389 | static ssize_t regulator_total_uA_show(struct device *dev, | |
390 | struct device_attribute *attr, char *buf) | |
391 | { | |
a5766f11 | 392 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
393 | struct regulator *regulator; |
394 | int uA = 0; | |
395 | ||
396 | mutex_lock(&rdev->mutex); | |
397 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 398 | uA += regulator->uA_load; |
414c70cb LG |
399 | mutex_unlock(&rdev->mutex); |
400 | return sprintf(buf, "%d\n", uA); | |
401 | } | |
7ad68e2f | 402 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
403 | |
404 | static ssize_t regulator_num_users_show(struct device *dev, | |
405 | struct device_attribute *attr, char *buf) | |
406 | { | |
a5766f11 | 407 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
408 | return sprintf(buf, "%d\n", rdev->use_count); |
409 | } | |
410 | ||
411 | static ssize_t regulator_type_show(struct device *dev, | |
412 | struct device_attribute *attr, char *buf) | |
413 | { | |
a5766f11 | 414 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
415 | |
416 | switch (rdev->desc->type) { | |
417 | case REGULATOR_VOLTAGE: | |
418 | return sprintf(buf, "voltage\n"); | |
419 | case REGULATOR_CURRENT: | |
420 | return sprintf(buf, "current\n"); | |
421 | } | |
422 | return sprintf(buf, "unknown\n"); | |
423 | } | |
424 | ||
425 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
a5766f11 | 428 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 429 | |
414c70cb LG |
430 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
431 | } | |
7ad68e2f DB |
432 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
433 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
434 | |
435 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
436 | struct device_attribute *attr, char *buf) | |
437 | { | |
a5766f11 | 438 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 439 | |
414c70cb LG |
440 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
441 | } | |
7ad68e2f DB |
442 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
443 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
444 | |
445 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
446 | struct device_attribute *attr, char *buf) | |
447 | { | |
a5766f11 | 448 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 449 | |
414c70cb LG |
450 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
451 | } | |
7ad68e2f DB |
452 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
453 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 454 | |
414c70cb LG |
455 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
456 | struct device_attribute *attr, char *buf) | |
457 | { | |
a5766f11 | 458 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 459 | |
4fca9545 DB |
460 | return regulator_print_opmode(buf, |
461 | rdev->constraints->state_mem.mode); | |
414c70cb | 462 | } |
7ad68e2f DB |
463 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
464 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
465 | |
466 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
467 | struct device_attribute *attr, char *buf) | |
468 | { | |
a5766f11 | 469 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 470 | |
4fca9545 DB |
471 | return regulator_print_opmode(buf, |
472 | rdev->constraints->state_disk.mode); | |
414c70cb | 473 | } |
7ad68e2f DB |
474 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
475 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
476 | |
477 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
478 | struct device_attribute *attr, char *buf) | |
479 | { | |
a5766f11 | 480 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 481 | |
4fca9545 DB |
482 | return regulator_print_opmode(buf, |
483 | rdev->constraints->state_standby.mode); | |
414c70cb | 484 | } |
7ad68e2f DB |
485 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
486 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
487 | |
488 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
489 | struct device_attribute *attr, char *buf) | |
490 | { | |
a5766f11 | 491 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 492 | |
4fca9545 DB |
493 | return regulator_print_state(buf, |
494 | rdev->constraints->state_mem.enabled); | |
414c70cb | 495 | } |
7ad68e2f DB |
496 | static DEVICE_ATTR(suspend_mem_state, 0444, |
497 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
498 | |
499 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
500 | struct device_attribute *attr, char *buf) | |
501 | { | |
a5766f11 | 502 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 503 | |
4fca9545 DB |
504 | return regulator_print_state(buf, |
505 | rdev->constraints->state_disk.enabled); | |
414c70cb | 506 | } |
7ad68e2f DB |
507 | static DEVICE_ATTR(suspend_disk_state, 0444, |
508 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
509 | |
510 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
511 | struct device_attribute *attr, char *buf) | |
512 | { | |
a5766f11 | 513 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 514 | |
4fca9545 DB |
515 | return regulator_print_state(buf, |
516 | rdev->constraints->state_standby.enabled); | |
414c70cb | 517 | } |
7ad68e2f DB |
518 | static DEVICE_ATTR(suspend_standby_state, 0444, |
519 | regulator_suspend_standby_state_show, NULL); | |
520 | ||
bc558a60 | 521 | |
7ad68e2f DB |
522 | /* |
523 | * These are the only attributes are present for all regulators. | |
524 | * Other attributes are a function of regulator functionality. | |
525 | */ | |
414c70cb | 526 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 527 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
528 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
529 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
530 | __ATTR_NULL, |
531 | }; | |
532 | ||
533 | static void regulator_dev_release(struct device *dev) | |
534 | { | |
a5766f11 | 535 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
536 | kfree(rdev); |
537 | } | |
538 | ||
539 | static struct class regulator_class = { | |
540 | .name = "regulator", | |
541 | .dev_release = regulator_dev_release, | |
542 | .dev_attrs = regulator_dev_attrs, | |
543 | }; | |
544 | ||
545 | /* Calculate the new optimum regulator operating mode based on the new total | |
546 | * consumer load. All locks held by caller */ | |
547 | static void drms_uA_update(struct regulator_dev *rdev) | |
548 | { | |
549 | struct regulator *sibling; | |
550 | int current_uA = 0, output_uV, input_uV, err; | |
551 | unsigned int mode; | |
552 | ||
553 | err = regulator_check_drms(rdev); | |
554 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
036de8ef DC |
555 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) |
556 | return; | |
414c70cb LG |
557 | |
558 | /* get output voltage */ | |
559 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
560 | if (output_uV <= 0) | |
561 | return; | |
562 | ||
563 | /* get input voltage */ | |
564 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
565 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
566 | else | |
567 | input_uV = rdev->constraints->input_uV; | |
568 | if (input_uV <= 0) | |
569 | return; | |
570 | ||
571 | /* calc total requested load */ | |
572 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 573 | current_uA += sibling->uA_load; |
414c70cb LG |
574 | |
575 | /* now get the optimum mode for our new total regulator load */ | |
576 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
577 | output_uV, current_uA); | |
578 | ||
579 | /* check the new mode is allowed */ | |
580 | err = regulator_check_mode(rdev, mode); | |
581 | if (err == 0) | |
582 | rdev->desc->ops->set_mode(rdev, mode); | |
583 | } | |
584 | ||
585 | static int suspend_set_state(struct regulator_dev *rdev, | |
586 | struct regulator_state *rstate) | |
587 | { | |
588 | int ret = 0; | |
638f85c5 MB |
589 | bool can_set_state; |
590 | ||
591 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
592 | rdev->desc->ops->set_suspend_disable; | |
593 | ||
594 | /* If we have no suspend mode configration don't set anything; | |
595 | * only warn if the driver actually makes the suspend mode | |
596 | * configurable. | |
597 | */ | |
598 | if (!rstate->enabled && !rstate->disabled) { | |
599 | if (can_set_state) | |
600 | printk(KERN_WARNING "%s: No configuration for %s\n", | |
601 | __func__, rdev_get_name(rdev)); | |
602 | return 0; | |
603 | } | |
604 | ||
605 | if (rstate->enabled && rstate->disabled) { | |
606 | printk(KERN_ERR "%s: invalid configuration for %s\n", | |
607 | __func__, rdev_get_name(rdev)); | |
608 | return -EINVAL; | |
609 | } | |
414c70cb | 610 | |
638f85c5 | 611 | if (!can_set_state) { |
a5766f11 LG |
612 | printk(KERN_ERR "%s: no way to set suspend state\n", |
613 | __func__); | |
414c70cb | 614 | return -EINVAL; |
a5766f11 | 615 | } |
414c70cb LG |
616 | |
617 | if (rstate->enabled) | |
618 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
619 | else | |
620 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
621 | if (ret < 0) { | |
622 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
623 | return ret; | |
624 | } | |
625 | ||
626 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
627 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
628 | if (ret < 0) { | |
629 | printk(KERN_ERR "%s: failed to set voltage\n", | |
630 | __func__); | |
631 | return ret; | |
632 | } | |
633 | } | |
634 | ||
635 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
636 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
637 | if (ret < 0) { | |
638 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
639 | return ret; | |
640 | } | |
641 | } | |
642 | return ret; | |
643 | } | |
644 | ||
645 | /* locks held by caller */ | |
646 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
647 | { | |
648 | if (!rdev->constraints) | |
649 | return -EINVAL; | |
650 | ||
651 | switch (state) { | |
652 | case PM_SUSPEND_STANDBY: | |
653 | return suspend_set_state(rdev, | |
654 | &rdev->constraints->state_standby); | |
655 | case PM_SUSPEND_MEM: | |
656 | return suspend_set_state(rdev, | |
657 | &rdev->constraints->state_mem); | |
658 | case PM_SUSPEND_MAX: | |
659 | return suspend_set_state(rdev, | |
660 | &rdev->constraints->state_disk); | |
661 | default: | |
662 | return -EINVAL; | |
663 | } | |
664 | } | |
665 | ||
666 | static void print_constraints(struct regulator_dev *rdev) | |
667 | { | |
668 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 669 | char buf[80] = ""; |
8f031b48 MB |
670 | int count = 0; |
671 | int ret; | |
414c70cb | 672 | |
8f031b48 | 673 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 674 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
675 | count += sprintf(buf + count, "%d mV ", |
676 | constraints->min_uV / 1000); | |
414c70cb | 677 | else |
8f031b48 MB |
678 | count += sprintf(buf + count, "%d <--> %d mV ", |
679 | constraints->min_uV / 1000, | |
680 | constraints->max_uV / 1000); | |
681 | } | |
682 | ||
683 | if (!constraints->min_uV || | |
684 | constraints->min_uV != constraints->max_uV) { | |
685 | ret = _regulator_get_voltage(rdev); | |
686 | if (ret > 0) | |
687 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
688 | } | |
689 | ||
690 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 691 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
692 | count += sprintf(buf + count, "%d mA ", |
693 | constraints->min_uA / 1000); | |
414c70cb | 694 | else |
8f031b48 MB |
695 | count += sprintf(buf + count, "%d <--> %d mA ", |
696 | constraints->min_uA / 1000, | |
697 | constraints->max_uA / 1000); | |
698 | } | |
699 | ||
700 | if (!constraints->min_uA || | |
701 | constraints->min_uA != constraints->max_uA) { | |
702 | ret = _regulator_get_current_limit(rdev); | |
703 | if (ret > 0) | |
e4a6376b | 704 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 705 | } |
8f031b48 | 706 | |
414c70cb LG |
707 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
708 | count += sprintf(buf + count, "fast "); | |
709 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
710 | count += sprintf(buf + count, "normal "); | |
711 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
712 | count += sprintf(buf + count, "idle "); | |
713 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
714 | count += sprintf(buf + count, "standby"); | |
715 | ||
1083c393 | 716 | printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); |
414c70cb LG |
717 | } |
718 | ||
e79055d6 | 719 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 720 | struct regulation_constraints *constraints) |
a5766f11 | 721 | { |
e5fda26c | 722 | struct regulator_ops *ops = rdev->desc->ops; |
1083c393 | 723 | const char *name = rdev_get_name(rdev); |
af5866c9 MB |
724 | int ret; |
725 | ||
726 | /* do we need to apply the constraint voltage */ | |
727 | if (rdev->constraints->apply_uV && | |
728 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
729 | ops->set_voltage) { | |
730 | ret = ops->set_voltage(rdev, | |
731 | rdev->constraints->min_uV, rdev->constraints->max_uV); | |
732 | if (ret < 0) { | |
733 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", | |
734 | __func__, | |
735 | rdev->constraints->min_uV, name); | |
736 | rdev->constraints = NULL; | |
737 | return ret; | |
738 | } | |
739 | } | |
e06f5b4f | 740 | |
4367cfdc DB |
741 | /* constrain machine-level voltage specs to fit |
742 | * the actual range supported by this regulator. | |
743 | */ | |
744 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
745 | int count = rdev->desc->n_voltages; | |
746 | int i; | |
747 | int min_uV = INT_MAX; | |
748 | int max_uV = INT_MIN; | |
749 | int cmin = constraints->min_uV; | |
750 | int cmax = constraints->max_uV; | |
751 | ||
3e590918 MB |
752 | /* it's safe to autoconfigure fixed-voltage supplies |
753 | and the constraints are used by list_voltage. */ | |
4367cfdc | 754 | if (count == 1 && !cmin) { |
3e590918 | 755 | cmin = 1; |
4367cfdc | 756 | cmax = INT_MAX; |
3e590918 MB |
757 | constraints->min_uV = cmin; |
758 | constraints->max_uV = cmax; | |
4367cfdc DB |
759 | } |
760 | ||
3e2b9abd MB |
761 | /* voltage constraints are optional */ |
762 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 763 | return 0; |
3e2b9abd | 764 | |
4367cfdc | 765 | /* else require explicit machine-level constraints */ |
3e2b9abd | 766 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
767 | pr_err("%s: %s '%s' voltage constraints\n", |
768 | __func__, "invalid", name); | |
e79055d6 | 769 | return -EINVAL; |
4367cfdc DB |
770 | } |
771 | ||
772 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
773 | for (i = 0; i < count; i++) { | |
774 | int value; | |
775 | ||
776 | value = ops->list_voltage(rdev, i); | |
777 | if (value <= 0) | |
778 | continue; | |
779 | ||
780 | /* maybe adjust [min_uV..max_uV] */ | |
781 | if (value >= cmin && value < min_uV) | |
782 | min_uV = value; | |
783 | if (value <= cmax && value > max_uV) | |
784 | max_uV = value; | |
785 | } | |
786 | ||
787 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
788 | if (max_uV < min_uV) { | |
789 | pr_err("%s: %s '%s' voltage constraints\n", | |
790 | __func__, "unsupportable", name); | |
e79055d6 | 791 | return -EINVAL; |
4367cfdc DB |
792 | } |
793 | ||
794 | /* use regulator's subset of machine constraints */ | |
795 | if (constraints->min_uV < min_uV) { | |
796 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
797 | __func__, name, "min_uV", | |
798 | constraints->min_uV, min_uV); | |
799 | constraints->min_uV = min_uV; | |
800 | } | |
801 | if (constraints->max_uV > max_uV) { | |
802 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
803 | __func__, name, "max_uV", | |
804 | constraints->max_uV, max_uV); | |
805 | constraints->max_uV = max_uV; | |
806 | } | |
807 | } | |
808 | ||
e79055d6 MB |
809 | return 0; |
810 | } | |
811 | ||
812 | /** | |
813 | * set_machine_constraints - sets regulator constraints | |
814 | * @rdev: regulator source | |
815 | * @constraints: constraints to apply | |
816 | * | |
817 | * Allows platform initialisation code to define and constrain | |
818 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
819 | * Constraints *must* be set by platform code in order for some | |
820 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
821 | * set_mode. | |
822 | */ | |
823 | static int set_machine_constraints(struct regulator_dev *rdev, | |
824 | struct regulation_constraints *constraints) | |
825 | { | |
826 | int ret = 0; | |
827 | const char *name; | |
828 | struct regulator_ops *ops = rdev->desc->ops; | |
829 | ||
af5866c9 MB |
830 | rdev->constraints = constraints; |
831 | ||
1083c393 MB |
832 | name = rdev_get_name(rdev); |
833 | ||
834 | ret = machine_constraints_voltage(rdev, constraints); | |
e79055d6 MB |
835 | if (ret != 0) |
836 | goto out; | |
837 | ||
a5766f11 | 838 | /* do we need to setup our suspend state */ |
e06f5b4f | 839 | if (constraints->initial_state) { |
a5766f11 | 840 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
841 | if (ret < 0) { |
842 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
843 | __func__, name); | |
844 | rdev->constraints = NULL; | |
845 | goto out; | |
846 | } | |
847 | } | |
a5766f11 | 848 | |
a308466c MB |
849 | if (constraints->initial_mode) { |
850 | if (!ops->set_mode) { | |
851 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
852 | __func__, name); | |
853 | ret = -EINVAL; | |
854 | goto out; | |
855 | } | |
856 | ||
857 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
858 | if (ret < 0) { | |
859 | printk(KERN_ERR | |
860 | "%s: failed to set initial mode for %s: %d\n", | |
861 | __func__, name, ret); | |
862 | goto out; | |
863 | } | |
864 | } | |
865 | ||
cacf90f2 MB |
866 | /* If the constraints say the regulator should be on at this point |
867 | * and we have control then make sure it is enabled. | |
868 | */ | |
869 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
870 | ret = ops->enable(rdev); |
871 | if (ret < 0) { | |
872 | printk(KERN_ERR "%s: failed to enable %s\n", | |
873 | __func__, name); | |
874 | rdev->constraints = NULL; | |
875 | goto out; | |
876 | } | |
877 | } | |
878 | ||
a5766f11 LG |
879 | print_constraints(rdev); |
880 | out: | |
881 | return ret; | |
882 | } | |
883 | ||
884 | /** | |
885 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
886 | * @rdev: regulator name |
887 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
888 | * |
889 | * Called by platform initialisation code to set the supply regulator for this | |
890 | * regulator. This ensures that a regulators supply will also be enabled by the | |
891 | * core if it's child is enabled. | |
892 | */ | |
893 | static int set_supply(struct regulator_dev *rdev, | |
894 | struct regulator_dev *supply_rdev) | |
895 | { | |
896 | int err; | |
897 | ||
898 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
899 | "supply"); | |
900 | if (err) { | |
901 | printk(KERN_ERR | |
902 | "%s: could not add device link %s err %d\n", | |
903 | __func__, supply_rdev->dev.kobj.name, err); | |
904 | goto out; | |
905 | } | |
906 | rdev->supply = supply_rdev; | |
907 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
908 | out: | |
909 | return err; | |
910 | } | |
911 | ||
912 | /** | |
913 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
914 | * @rdev: regulator source |
915 | * @consumer_dev: device the supply applies to | |
40f9244f | 916 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 917 | * @supply: symbolic name for supply |
a5766f11 LG |
918 | * |
919 | * Allows platform initialisation code to map physical regulator | |
920 | * sources to symbolic names for supplies for use by devices. Devices | |
921 | * should use these symbolic names to request regulators, avoiding the | |
922 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
923 | * |
924 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
925 | */ |
926 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
927 | struct device *consumer_dev, const char *consumer_dev_name, |
928 | const char *supply) | |
a5766f11 LG |
929 | { |
930 | struct regulator_map *node; | |
9ed2099e | 931 | int has_dev; |
a5766f11 | 932 | |
40f9244f MB |
933 | if (consumer_dev && consumer_dev_name) |
934 | return -EINVAL; | |
935 | ||
936 | if (!consumer_dev_name && consumer_dev) | |
937 | consumer_dev_name = dev_name(consumer_dev); | |
938 | ||
a5766f11 LG |
939 | if (supply == NULL) |
940 | return -EINVAL; | |
941 | ||
9ed2099e MB |
942 | if (consumer_dev_name != NULL) |
943 | has_dev = 1; | |
944 | else | |
945 | has_dev = 0; | |
946 | ||
6001e13c | 947 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
948 | if (node->dev_name && consumer_dev_name) { |
949 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
950 | continue; | |
951 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 952 | continue; |
23b5cc2a JN |
953 | } |
954 | ||
6001e13c DB |
955 | if (strcmp(node->supply, supply) != 0) |
956 | continue; | |
957 | ||
958 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
959 | dev_name(&node->regulator->dev), | |
960 | node->regulator->desc->name, | |
961 | supply, | |
1083c393 | 962 | dev_name(&rdev->dev), rdev_get_name(rdev)); |
6001e13c DB |
963 | return -EBUSY; |
964 | } | |
965 | ||
9ed2099e | 966 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
967 | if (node == NULL) |
968 | return -ENOMEM; | |
969 | ||
970 | node->regulator = rdev; | |
a5766f11 LG |
971 | node->supply = supply; |
972 | ||
9ed2099e MB |
973 | if (has_dev) { |
974 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
975 | if (node->dev_name == NULL) { | |
976 | kfree(node); | |
977 | return -ENOMEM; | |
978 | } | |
40f9244f MB |
979 | } |
980 | ||
a5766f11 LG |
981 | list_add(&node->list, ®ulator_map_list); |
982 | return 0; | |
983 | } | |
984 | ||
0f1d747b MR |
985 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
986 | { | |
987 | struct regulator_map *node, *n; | |
988 | ||
989 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
990 | if (rdev == node->regulator) { | |
991 | list_del(&node->list); | |
40f9244f | 992 | kfree(node->dev_name); |
0f1d747b | 993 | kfree(node); |
0f1d747b MR |
994 | } |
995 | } | |
996 | } | |
997 | ||
414c70cb LG |
998 | #define REG_STR_SIZE 32 |
999 | ||
1000 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1001 | struct device *dev, | |
1002 | const char *supply_name) | |
1003 | { | |
1004 | struct regulator *regulator; | |
1005 | char buf[REG_STR_SIZE]; | |
1006 | int err, size; | |
1007 | ||
1008 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1009 | if (regulator == NULL) | |
1010 | return NULL; | |
1011 | ||
1012 | mutex_lock(&rdev->mutex); | |
1013 | regulator->rdev = rdev; | |
1014 | list_add(®ulator->list, &rdev->consumer_list); | |
1015 | ||
1016 | if (dev) { | |
1017 | /* create a 'requested_microamps_name' sysfs entry */ | |
1018 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1019 | supply_name); | |
1020 | if (size >= REG_STR_SIZE) | |
1021 | goto overflow_err; | |
1022 | ||
1023 | regulator->dev = dev; | |
4f26a2ab | 1024 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1025 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1026 | if (regulator->dev_attr.attr.name == NULL) | |
1027 | goto attr_name_err; | |
1028 | ||
414c70cb LG |
1029 | regulator->dev_attr.attr.mode = 0444; |
1030 | regulator->dev_attr.show = device_requested_uA_show; | |
1031 | err = device_create_file(dev, ®ulator->dev_attr); | |
1032 | if (err < 0) { | |
1033 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
1034 | " load sysfs\n", __func__); | |
1035 | goto attr_name_err; | |
1036 | } | |
1037 | ||
1038 | /* also add a link to the device sysfs entry */ | |
1039 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1040 | dev->kobj.name, supply_name); | |
1041 | if (size >= REG_STR_SIZE) | |
1042 | goto attr_err; | |
1043 | ||
1044 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1045 | if (regulator->supply_name == NULL) | |
1046 | goto attr_err; | |
1047 | ||
1048 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1049 | buf); | |
1050 | if (err) { | |
1051 | printk(KERN_WARNING | |
1052 | "%s: could not add device link %s err %d\n", | |
1053 | __func__, dev->kobj.name, err); | |
1054 | device_remove_file(dev, ®ulator->dev_attr); | |
1055 | goto link_name_err; | |
1056 | } | |
1057 | } | |
1058 | mutex_unlock(&rdev->mutex); | |
1059 | return regulator; | |
1060 | link_name_err: | |
1061 | kfree(regulator->supply_name); | |
1062 | attr_err: | |
1063 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1064 | attr_name_err: | |
1065 | kfree(regulator->dev_attr.attr.name); | |
1066 | overflow_err: | |
1067 | list_del(®ulator->list); | |
1068 | kfree(regulator); | |
1069 | mutex_unlock(&rdev->mutex); | |
1070 | return NULL; | |
1071 | } | |
1072 | ||
31aae2be MB |
1073 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1074 | { | |
1075 | if (!rdev->desc->ops->enable_time) | |
1076 | return 0; | |
1077 | return rdev->desc->ops->enable_time(rdev); | |
1078 | } | |
1079 | ||
5ffbd136 MB |
1080 | /* Internal regulator request function */ |
1081 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1082 | int exclusive) | |
414c70cb LG |
1083 | { |
1084 | struct regulator_dev *rdev; | |
1085 | struct regulator_map *map; | |
1086 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1087 | const char *devname = NULL; |
5ffbd136 | 1088 | int ret; |
414c70cb LG |
1089 | |
1090 | if (id == NULL) { | |
1091 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1092 | return regulator; | |
1093 | } | |
1094 | ||
40f9244f MB |
1095 | if (dev) |
1096 | devname = dev_name(dev); | |
1097 | ||
414c70cb LG |
1098 | mutex_lock(®ulator_list_mutex); |
1099 | ||
1100 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1101 | /* If the mapping has a device set up it must match */ |
1102 | if (map->dev_name && | |
1103 | (!devname || strcmp(map->dev_name, devname))) | |
1104 | continue; | |
1105 | ||
1106 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1107 | rdev = map->regulator; |
414c70cb | 1108 | goto found; |
a5766f11 | 1109 | } |
414c70cb | 1110 | } |
34abbd68 | 1111 | |
688fe99a MB |
1112 | if (board_wants_dummy_regulator) { |
1113 | rdev = dummy_regulator_rdev; | |
1114 | goto found; | |
1115 | } | |
1116 | ||
34abbd68 MB |
1117 | #ifdef CONFIG_REGULATOR_DUMMY |
1118 | if (!devname) | |
1119 | devname = "deviceless"; | |
1120 | ||
1121 | /* If the board didn't flag that it was fully constrained then | |
1122 | * substitute in a dummy regulator so consumers can continue. | |
1123 | */ | |
1124 | if (!has_full_constraints) { | |
1125 | pr_warning("%s supply %s not found, using dummy regulator\n", | |
1126 | devname, id); | |
1127 | rdev = dummy_regulator_rdev; | |
1128 | goto found; | |
1129 | } | |
1130 | #endif | |
1131 | ||
414c70cb LG |
1132 | mutex_unlock(®ulator_list_mutex); |
1133 | return regulator; | |
1134 | ||
1135 | found: | |
5ffbd136 MB |
1136 | if (rdev->exclusive) { |
1137 | regulator = ERR_PTR(-EPERM); | |
1138 | goto out; | |
1139 | } | |
1140 | ||
1141 | if (exclusive && rdev->open_count) { | |
1142 | regulator = ERR_PTR(-EBUSY); | |
1143 | goto out; | |
1144 | } | |
1145 | ||
a5766f11 LG |
1146 | if (!try_module_get(rdev->owner)) |
1147 | goto out; | |
1148 | ||
414c70cb LG |
1149 | regulator = create_regulator(rdev, dev, id); |
1150 | if (regulator == NULL) { | |
1151 | regulator = ERR_PTR(-ENOMEM); | |
1152 | module_put(rdev->owner); | |
1153 | } | |
1154 | ||
5ffbd136 MB |
1155 | rdev->open_count++; |
1156 | if (exclusive) { | |
1157 | rdev->exclusive = 1; | |
1158 | ||
1159 | ret = _regulator_is_enabled(rdev); | |
1160 | if (ret > 0) | |
1161 | rdev->use_count = 1; | |
1162 | else | |
1163 | rdev->use_count = 0; | |
1164 | } | |
1165 | ||
a5766f11 | 1166 | out: |
414c70cb | 1167 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1168 | |
414c70cb LG |
1169 | return regulator; |
1170 | } | |
5ffbd136 MB |
1171 | |
1172 | /** | |
1173 | * regulator_get - lookup and obtain a reference to a regulator. | |
1174 | * @dev: device for regulator "consumer" | |
1175 | * @id: Supply name or regulator ID. | |
1176 | * | |
1177 | * Returns a struct regulator corresponding to the regulator producer, | |
1178 | * or IS_ERR() condition containing errno. | |
1179 | * | |
1180 | * Use of supply names configured via regulator_set_device_supply() is | |
1181 | * strongly encouraged. It is recommended that the supply name used | |
1182 | * should match the name used for the supply and/or the relevant | |
1183 | * device pins in the datasheet. | |
1184 | */ | |
1185 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1186 | { | |
1187 | return _regulator_get(dev, id, 0); | |
1188 | } | |
414c70cb LG |
1189 | EXPORT_SYMBOL_GPL(regulator_get); |
1190 | ||
5ffbd136 MB |
1191 | /** |
1192 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1193 | * @dev: device for regulator "consumer" | |
1194 | * @id: Supply name or regulator ID. | |
1195 | * | |
1196 | * Returns a struct regulator corresponding to the regulator producer, | |
1197 | * or IS_ERR() condition containing errno. Other consumers will be | |
1198 | * unable to obtain this reference is held and the use count for the | |
1199 | * regulator will be initialised to reflect the current state of the | |
1200 | * regulator. | |
1201 | * | |
1202 | * This is intended for use by consumers which cannot tolerate shared | |
1203 | * use of the regulator such as those which need to force the | |
1204 | * regulator off for correct operation of the hardware they are | |
1205 | * controlling. | |
1206 | * | |
1207 | * Use of supply names configured via regulator_set_device_supply() is | |
1208 | * strongly encouraged. It is recommended that the supply name used | |
1209 | * should match the name used for the supply and/or the relevant | |
1210 | * device pins in the datasheet. | |
1211 | */ | |
1212 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1213 | { | |
1214 | return _regulator_get(dev, id, 1); | |
1215 | } | |
1216 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1217 | ||
414c70cb LG |
1218 | /** |
1219 | * regulator_put - "free" the regulator source | |
1220 | * @regulator: regulator source | |
1221 | * | |
1222 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1223 | * regulator source are balanced by regulator_disable calls prior to calling | |
1224 | * this function. | |
1225 | */ | |
1226 | void regulator_put(struct regulator *regulator) | |
1227 | { | |
1228 | struct regulator_dev *rdev; | |
1229 | ||
1230 | if (regulator == NULL || IS_ERR(regulator)) | |
1231 | return; | |
1232 | ||
414c70cb LG |
1233 | mutex_lock(®ulator_list_mutex); |
1234 | rdev = regulator->rdev; | |
1235 | ||
1236 | /* remove any sysfs entries */ | |
1237 | if (regulator->dev) { | |
1238 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1239 | kfree(regulator->supply_name); | |
1240 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1241 | kfree(regulator->dev_attr.attr.name); | |
1242 | } | |
1243 | list_del(®ulator->list); | |
1244 | kfree(regulator); | |
1245 | ||
5ffbd136 MB |
1246 | rdev->open_count--; |
1247 | rdev->exclusive = 0; | |
1248 | ||
414c70cb LG |
1249 | module_put(rdev->owner); |
1250 | mutex_unlock(®ulator_list_mutex); | |
1251 | } | |
1252 | EXPORT_SYMBOL_GPL(regulator_put); | |
1253 | ||
9a2372fa MB |
1254 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1255 | { | |
1256 | if (!rdev->constraints) | |
1257 | return 0; | |
1258 | ||
1259 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1260 | return 1; | |
1261 | else | |
1262 | return 0; | |
1263 | } | |
1264 | ||
414c70cb LG |
1265 | /* locks held by regulator_enable() */ |
1266 | static int _regulator_enable(struct regulator_dev *rdev) | |
1267 | { | |
31aae2be | 1268 | int ret, delay; |
414c70cb LG |
1269 | |
1270 | /* do we need to enable the supply regulator first */ | |
1271 | if (rdev->supply) { | |
1272 | ret = _regulator_enable(rdev->supply); | |
1273 | if (ret < 0) { | |
1274 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1083c393 | 1275 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1276 | return ret; |
1277 | } | |
1278 | } | |
1279 | ||
1280 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1281 | if (rdev->constraints && |
1282 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1283 | drms_uA_update(rdev); | |
414c70cb | 1284 | |
9a2372fa MB |
1285 | if (rdev->use_count == 0) { |
1286 | /* The regulator may on if it's not switchable or left on */ | |
1287 | ret = _regulator_is_enabled(rdev); | |
1288 | if (ret == -EINVAL || ret == 0) { | |
1289 | if (!_regulator_can_change_status(rdev)) | |
1290 | return -EPERM; | |
1291 | ||
31aae2be | 1292 | if (!rdev->desc->ops->enable) |
9a2372fa | 1293 | return -EINVAL; |
31aae2be MB |
1294 | |
1295 | /* Query before enabling in case configuration | |
1296 | * dependant. */ | |
1297 | ret = _regulator_get_enable_time(rdev); | |
1298 | if (ret >= 0) { | |
1299 | delay = ret; | |
1300 | } else { | |
1301 | printk(KERN_WARNING | |
1302 | "%s: enable_time() failed for %s: %d\n", | |
1303 | __func__, rdev_get_name(rdev), | |
1304 | ret); | |
1305 | delay = 0; | |
9a2372fa | 1306 | } |
31aae2be MB |
1307 | |
1308 | /* Allow the regulator to ramp; it would be useful | |
1309 | * to extend this for bulk operations so that the | |
1310 | * regulators can ramp together. */ | |
1311 | ret = rdev->desc->ops->enable(rdev); | |
1312 | if (ret < 0) | |
1313 | return ret; | |
1314 | ||
1315 | if (delay >= 1000) | |
1316 | mdelay(delay / 1000); | |
1317 | else if (delay) | |
1318 | udelay(delay); | |
1319 | ||
a7433cff | 1320 | } else if (ret < 0) { |
9a2372fa | 1321 | printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", |
1083c393 | 1322 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1323 | return ret; |
1324 | } | |
a7433cff | 1325 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1326 | } |
1327 | ||
9a2372fa MB |
1328 | rdev->use_count++; |
1329 | ||
1330 | return 0; | |
414c70cb LG |
1331 | } |
1332 | ||
1333 | /** | |
1334 | * regulator_enable - enable regulator output | |
1335 | * @regulator: regulator source | |
1336 | * | |
cf7bbcdf MB |
1337 | * Request that the regulator be enabled with the regulator output at |
1338 | * the predefined voltage or current value. Calls to regulator_enable() | |
1339 | * must be balanced with calls to regulator_disable(). | |
1340 | * | |
414c70cb | 1341 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1342 | * hardwired in the regulator. |
414c70cb LG |
1343 | */ |
1344 | int regulator_enable(struct regulator *regulator) | |
1345 | { | |
412aec61 DB |
1346 | struct regulator_dev *rdev = regulator->rdev; |
1347 | int ret = 0; | |
414c70cb | 1348 | |
412aec61 | 1349 | mutex_lock(&rdev->mutex); |
cd94b505 | 1350 | ret = _regulator_enable(rdev); |
412aec61 | 1351 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1352 | return ret; |
1353 | } | |
1354 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1355 | ||
1356 | /* locks held by regulator_disable() */ | |
1357 | static int _regulator_disable(struct regulator_dev *rdev) | |
1358 | { | |
1359 | int ret = 0; | |
1360 | ||
cd94b505 DB |
1361 | if (WARN(rdev->use_count <= 0, |
1362 | "unbalanced disables for %s\n", | |
1083c393 | 1363 | rdev_get_name(rdev))) |
cd94b505 DB |
1364 | return -EIO; |
1365 | ||
414c70cb | 1366 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1367 | if (rdev->use_count == 1 && |
1368 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1369 | |
1370 | /* we are last user */ | |
9a2372fa MB |
1371 | if (_regulator_can_change_status(rdev) && |
1372 | rdev->desc->ops->disable) { | |
414c70cb LG |
1373 | ret = rdev->desc->ops->disable(rdev); |
1374 | if (ret < 0) { | |
1375 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1083c393 | 1376 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1377 | return ret; |
1378 | } | |
84b68263 MB |
1379 | |
1380 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1381 | NULL); | |
414c70cb LG |
1382 | } |
1383 | ||
1384 | /* decrease our supplies ref count and disable if required */ | |
1385 | if (rdev->supply) | |
1386 | _regulator_disable(rdev->supply); | |
1387 | ||
1388 | rdev->use_count = 0; | |
1389 | } else if (rdev->use_count > 1) { | |
1390 | ||
1391 | if (rdev->constraints && | |
1392 | (rdev->constraints->valid_ops_mask & | |
1393 | REGULATOR_CHANGE_DRMS)) | |
1394 | drms_uA_update(rdev); | |
1395 | ||
1396 | rdev->use_count--; | |
1397 | } | |
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * regulator_disable - disable regulator output | |
1403 | * @regulator: regulator source | |
1404 | * | |
cf7bbcdf MB |
1405 | * Disable the regulator output voltage or current. Calls to |
1406 | * regulator_enable() must be balanced with calls to | |
1407 | * regulator_disable(). | |
69279fb9 | 1408 | * |
414c70cb | 1409 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1410 | * devices have it enabled, the regulator device supports disabling and |
1411 | * machine constraints permit this operation. | |
414c70cb LG |
1412 | */ |
1413 | int regulator_disable(struct regulator *regulator) | |
1414 | { | |
412aec61 DB |
1415 | struct regulator_dev *rdev = regulator->rdev; |
1416 | int ret = 0; | |
414c70cb | 1417 | |
412aec61 | 1418 | mutex_lock(&rdev->mutex); |
cd94b505 | 1419 | ret = _regulator_disable(rdev); |
412aec61 | 1420 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1421 | return ret; |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1424 | ||
1425 | /* locks held by regulator_force_disable() */ | |
1426 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1427 | { | |
1428 | int ret = 0; | |
1429 | ||
1430 | /* force disable */ | |
1431 | if (rdev->desc->ops->disable) { | |
1432 | /* ah well, who wants to live forever... */ | |
1433 | ret = rdev->desc->ops->disable(rdev); | |
1434 | if (ret < 0) { | |
1435 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1083c393 | 1436 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1437 | return ret; |
1438 | } | |
1439 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1440 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1441 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1442 | } |
1443 | ||
1444 | /* decrease our supplies ref count and disable if required */ | |
1445 | if (rdev->supply) | |
1446 | _regulator_disable(rdev->supply); | |
1447 | ||
1448 | rdev->use_count = 0; | |
1449 | return ret; | |
1450 | } | |
1451 | ||
1452 | /** | |
1453 | * regulator_force_disable - force disable regulator output | |
1454 | * @regulator: regulator source | |
1455 | * | |
1456 | * Forcibly disable the regulator output voltage or current. | |
1457 | * NOTE: this *will* disable the regulator output even if other consumer | |
1458 | * devices have it enabled. This should be used for situations when device | |
1459 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1460 | */ | |
1461 | int regulator_force_disable(struct regulator *regulator) | |
1462 | { | |
1463 | int ret; | |
1464 | ||
1465 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1466 | regulator->uA_load = 0; |
1467 | ret = _regulator_force_disable(regulator->rdev); | |
1468 | mutex_unlock(®ulator->rdev->mutex); | |
1469 | return ret; | |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1472 | ||
1473 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1474 | { | |
9a7f6a4c | 1475 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1476 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1477 | return 1; |
414c70cb | 1478 | |
9332546f | 1479 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1480 | } |
1481 | ||
1482 | /** | |
1483 | * regulator_is_enabled - is the regulator output enabled | |
1484 | * @regulator: regulator source | |
1485 | * | |
412aec61 DB |
1486 | * Returns positive if the regulator driver backing the source/client |
1487 | * has requested that the device be enabled, zero if it hasn't, else a | |
1488 | * negative errno code. | |
1489 | * | |
1490 | * Note that the device backing this regulator handle can have multiple | |
1491 | * users, so it might be enabled even if regulator_enable() was never | |
1492 | * called for this particular source. | |
414c70cb LG |
1493 | */ |
1494 | int regulator_is_enabled(struct regulator *regulator) | |
1495 | { | |
9332546f MB |
1496 | int ret; |
1497 | ||
1498 | mutex_lock(®ulator->rdev->mutex); | |
1499 | ret = _regulator_is_enabled(regulator->rdev); | |
1500 | mutex_unlock(®ulator->rdev->mutex); | |
1501 | ||
1502 | return ret; | |
414c70cb LG |
1503 | } |
1504 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1505 | ||
4367cfdc DB |
1506 | /** |
1507 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1508 | * @regulator: regulator source | |
1509 | * | |
1510 | * Returns number of selectors, or negative errno. Selectors are | |
1511 | * numbered starting at zero, and typically correspond to bitfields | |
1512 | * in hardware registers. | |
1513 | */ | |
1514 | int regulator_count_voltages(struct regulator *regulator) | |
1515 | { | |
1516 | struct regulator_dev *rdev = regulator->rdev; | |
1517 | ||
1518 | return rdev->desc->n_voltages ? : -EINVAL; | |
1519 | } | |
1520 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1521 | ||
1522 | /** | |
1523 | * regulator_list_voltage - enumerate supported voltages | |
1524 | * @regulator: regulator source | |
1525 | * @selector: identify voltage to list | |
1526 | * Context: can sleep | |
1527 | * | |
1528 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1529 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1530 | * negative errno. |
1531 | */ | |
1532 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1533 | { | |
1534 | struct regulator_dev *rdev = regulator->rdev; | |
1535 | struct regulator_ops *ops = rdev->desc->ops; | |
1536 | int ret; | |
1537 | ||
1538 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1539 | return -EINVAL; | |
1540 | ||
1541 | mutex_lock(&rdev->mutex); | |
1542 | ret = ops->list_voltage(rdev, selector); | |
1543 | mutex_unlock(&rdev->mutex); | |
1544 | ||
1545 | if (ret > 0) { | |
1546 | if (ret < rdev->constraints->min_uV) | |
1547 | ret = 0; | |
1548 | else if (ret > rdev->constraints->max_uV) | |
1549 | ret = 0; | |
1550 | } | |
1551 | ||
1552 | return ret; | |
1553 | } | |
1554 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1555 | ||
a7a1ad90 MB |
1556 | /** |
1557 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1558 | * | |
1559 | * @regulator: Regulator to check. | |
1560 | * @min_uV: Minimum required voltage in uV. | |
1561 | * @max_uV: Maximum required voltage in uV. | |
1562 | * | |
1563 | * Returns a boolean or a negative error code. | |
1564 | */ | |
1565 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1566 | int min_uV, int max_uV) | |
1567 | { | |
1568 | int i, voltages, ret; | |
1569 | ||
1570 | ret = regulator_count_voltages(regulator); | |
1571 | if (ret < 0) | |
1572 | return ret; | |
1573 | voltages = ret; | |
1574 | ||
1575 | for (i = 0; i < voltages; i++) { | |
1576 | ret = regulator_list_voltage(regulator, i); | |
1577 | ||
1578 | if (ret >= min_uV && ret <= max_uV) | |
1579 | return 1; | |
1580 | } | |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
414c70cb LG |
1585 | /** |
1586 | * regulator_set_voltage - set regulator output voltage | |
1587 | * @regulator: regulator source | |
1588 | * @min_uV: Minimum required voltage in uV | |
1589 | * @max_uV: Maximum acceptable voltage in uV | |
1590 | * | |
1591 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1592 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1593 | * | |
1594 | * If the regulator is enabled then the voltage will change to the new value | |
1595 | * immediately otherwise if the regulator is disabled the regulator will | |
1596 | * output at the new voltage when enabled. | |
1597 | * | |
1598 | * NOTE: If the regulator is shared between several devices then the lowest | |
1599 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1600 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1601 | * calling this function otherwise this call will fail. |
1602 | */ | |
1603 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1604 | { | |
1605 | struct regulator_dev *rdev = regulator->rdev; | |
1606 | int ret; | |
1607 | ||
1608 | mutex_lock(&rdev->mutex); | |
1609 | ||
1610 | /* sanity check */ | |
1611 | if (!rdev->desc->ops->set_voltage) { | |
1612 | ret = -EINVAL; | |
1613 | goto out; | |
1614 | } | |
1615 | ||
1616 | /* constraints check */ | |
1617 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1618 | if (ret < 0) | |
1619 | goto out; | |
1620 | regulator->min_uV = min_uV; | |
1621 | regulator->max_uV = max_uV; | |
1622 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1623 | ||
1624 | out: | |
b136fb44 | 1625 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1626 | mutex_unlock(&rdev->mutex); |
1627 | return ret; | |
1628 | } | |
1629 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1630 | ||
1631 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1632 | { | |
1633 | /* sanity check */ | |
1634 | if (rdev->desc->ops->get_voltage) | |
1635 | return rdev->desc->ops->get_voltage(rdev); | |
1636 | else | |
1637 | return -EINVAL; | |
1638 | } | |
1639 | ||
1640 | /** | |
1641 | * regulator_get_voltage - get regulator output voltage | |
1642 | * @regulator: regulator source | |
1643 | * | |
1644 | * This returns the current regulator voltage in uV. | |
1645 | * | |
1646 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1647 | * function should not be used to determine regulator state. | |
1648 | */ | |
1649 | int regulator_get_voltage(struct regulator *regulator) | |
1650 | { | |
1651 | int ret; | |
1652 | ||
1653 | mutex_lock(®ulator->rdev->mutex); | |
1654 | ||
1655 | ret = _regulator_get_voltage(regulator->rdev); | |
1656 | ||
1657 | mutex_unlock(®ulator->rdev->mutex); | |
1658 | ||
1659 | return ret; | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1662 | ||
1663 | /** | |
1664 | * regulator_set_current_limit - set regulator output current limit | |
1665 | * @regulator: regulator source | |
1666 | * @min_uA: Minimuum supported current in uA | |
1667 | * @max_uA: Maximum supported current in uA | |
1668 | * | |
1669 | * Sets current sink to the desired output current. This can be set during | |
1670 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1671 | * | |
1672 | * If the regulator is enabled then the current will change to the new value | |
1673 | * immediately otherwise if the regulator is disabled the regulator will | |
1674 | * output at the new current when enabled. | |
1675 | * | |
1676 | * NOTE: Regulator system constraints must be set for this regulator before | |
1677 | * calling this function otherwise this call will fail. | |
1678 | */ | |
1679 | int regulator_set_current_limit(struct regulator *regulator, | |
1680 | int min_uA, int max_uA) | |
1681 | { | |
1682 | struct regulator_dev *rdev = regulator->rdev; | |
1683 | int ret; | |
1684 | ||
1685 | mutex_lock(&rdev->mutex); | |
1686 | ||
1687 | /* sanity check */ | |
1688 | if (!rdev->desc->ops->set_current_limit) { | |
1689 | ret = -EINVAL; | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | /* constraints check */ | |
1694 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1695 | if (ret < 0) | |
1696 | goto out; | |
1697 | ||
1698 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1699 | out: | |
1700 | mutex_unlock(&rdev->mutex); | |
1701 | return ret; | |
1702 | } | |
1703 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1704 | ||
1705 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1706 | { | |
1707 | int ret; | |
1708 | ||
1709 | mutex_lock(&rdev->mutex); | |
1710 | ||
1711 | /* sanity check */ | |
1712 | if (!rdev->desc->ops->get_current_limit) { | |
1713 | ret = -EINVAL; | |
1714 | goto out; | |
1715 | } | |
1716 | ||
1717 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1718 | out: | |
1719 | mutex_unlock(&rdev->mutex); | |
1720 | return ret; | |
1721 | } | |
1722 | ||
1723 | /** | |
1724 | * regulator_get_current_limit - get regulator output current | |
1725 | * @regulator: regulator source | |
1726 | * | |
1727 | * This returns the current supplied by the specified current sink in uA. | |
1728 | * | |
1729 | * NOTE: If the regulator is disabled it will return the current value. This | |
1730 | * function should not be used to determine regulator state. | |
1731 | */ | |
1732 | int regulator_get_current_limit(struct regulator *regulator) | |
1733 | { | |
1734 | return _regulator_get_current_limit(regulator->rdev); | |
1735 | } | |
1736 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1737 | ||
1738 | /** | |
1739 | * regulator_set_mode - set regulator operating mode | |
1740 | * @regulator: regulator source | |
1741 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1742 | * | |
1743 | * Set regulator operating mode to increase regulator efficiency or improve | |
1744 | * regulation performance. | |
1745 | * | |
1746 | * NOTE: Regulator system constraints must be set for this regulator before | |
1747 | * calling this function otherwise this call will fail. | |
1748 | */ | |
1749 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1750 | { | |
1751 | struct regulator_dev *rdev = regulator->rdev; | |
1752 | int ret; | |
500b4ac9 | 1753 | int regulator_curr_mode; |
414c70cb LG |
1754 | |
1755 | mutex_lock(&rdev->mutex); | |
1756 | ||
1757 | /* sanity check */ | |
1758 | if (!rdev->desc->ops->set_mode) { | |
1759 | ret = -EINVAL; | |
1760 | goto out; | |
1761 | } | |
1762 | ||
500b4ac9 SI |
1763 | /* return if the same mode is requested */ |
1764 | if (rdev->desc->ops->get_mode) { | |
1765 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
1766 | if (regulator_curr_mode == mode) { | |
1767 | ret = 0; | |
1768 | goto out; | |
1769 | } | |
1770 | } | |
1771 | ||
414c70cb LG |
1772 | /* constraints check */ |
1773 | ret = regulator_check_mode(rdev, mode); | |
1774 | if (ret < 0) | |
1775 | goto out; | |
1776 | ||
1777 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1778 | out: | |
1779 | mutex_unlock(&rdev->mutex); | |
1780 | return ret; | |
1781 | } | |
1782 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1783 | ||
1784 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1785 | { | |
1786 | int ret; | |
1787 | ||
1788 | mutex_lock(&rdev->mutex); | |
1789 | ||
1790 | /* sanity check */ | |
1791 | if (!rdev->desc->ops->get_mode) { | |
1792 | ret = -EINVAL; | |
1793 | goto out; | |
1794 | } | |
1795 | ||
1796 | ret = rdev->desc->ops->get_mode(rdev); | |
1797 | out: | |
1798 | mutex_unlock(&rdev->mutex); | |
1799 | return ret; | |
1800 | } | |
1801 | ||
1802 | /** | |
1803 | * regulator_get_mode - get regulator operating mode | |
1804 | * @regulator: regulator source | |
1805 | * | |
1806 | * Get the current regulator operating mode. | |
1807 | */ | |
1808 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1809 | { | |
1810 | return _regulator_get_mode(regulator->rdev); | |
1811 | } | |
1812 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1813 | ||
1814 | /** | |
1815 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1816 | * @regulator: regulator source | |
1817 | * @uA_load: load current | |
1818 | * | |
1819 | * Notifies the regulator core of a new device load. This is then used by | |
1820 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1821 | * operating mode for the new regulator loading. | |
1822 | * | |
1823 | * Consumer devices notify their supply regulator of the maximum power | |
1824 | * they will require (can be taken from device datasheet in the power | |
1825 | * consumption tables) when they change operational status and hence power | |
1826 | * state. Examples of operational state changes that can affect power | |
1827 | * consumption are :- | |
1828 | * | |
1829 | * o Device is opened / closed. | |
1830 | * o Device I/O is about to begin or has just finished. | |
1831 | * o Device is idling in between work. | |
1832 | * | |
1833 | * This information is also exported via sysfs to userspace. | |
1834 | * | |
1835 | * DRMS will sum the total requested load on the regulator and change | |
1836 | * to the most efficient operating mode if platform constraints allow. | |
1837 | * | |
1838 | * Returns the new regulator mode or error. | |
1839 | */ | |
1840 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1841 | { | |
1842 | struct regulator_dev *rdev = regulator->rdev; | |
1843 | struct regulator *consumer; | |
1844 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1845 | unsigned int mode; | |
1846 | ||
1847 | mutex_lock(&rdev->mutex); | |
1848 | ||
1849 | regulator->uA_load = uA_load; | |
1850 | ret = regulator_check_drms(rdev); | |
1851 | if (ret < 0) | |
1852 | goto out; | |
1853 | ret = -EINVAL; | |
1854 | ||
1855 | /* sanity check */ | |
1856 | if (!rdev->desc->ops->get_optimum_mode) | |
1857 | goto out; | |
1858 | ||
1859 | /* get output voltage */ | |
1860 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1861 | if (output_uV <= 0) { | |
1862 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1083c393 | 1863 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1864 | goto out; |
1865 | } | |
1866 | ||
1867 | /* get input voltage */ | |
1868 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1869 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1870 | else | |
1871 | input_uV = rdev->constraints->input_uV; | |
1872 | if (input_uV <= 0) { | |
1873 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1083c393 | 1874 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1875 | goto out; |
1876 | } | |
1877 | ||
1878 | /* calc total requested load for this regulator */ | |
1879 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 1880 | total_uA_load += consumer->uA_load; |
414c70cb LG |
1881 | |
1882 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1883 | input_uV, output_uV, | |
1884 | total_uA_load); | |
e573520b DB |
1885 | ret = regulator_check_mode(rdev, mode); |
1886 | if (ret < 0) { | |
414c70cb | 1887 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1083c393 | 1888 | " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), |
414c70cb LG |
1889 | total_uA_load, input_uV, output_uV); |
1890 | goto out; | |
1891 | } | |
1892 | ||
1893 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1894 | if (ret < 0) { |
414c70cb | 1895 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1083c393 | 1896 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
1897 | goto out; |
1898 | } | |
1899 | ret = mode; | |
1900 | out: | |
1901 | mutex_unlock(&rdev->mutex); | |
1902 | return ret; | |
1903 | } | |
1904 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1905 | ||
1906 | /** | |
1907 | * regulator_register_notifier - register regulator event notifier | |
1908 | * @regulator: regulator source | |
69279fb9 | 1909 | * @nb: notifier block |
414c70cb LG |
1910 | * |
1911 | * Register notifier block to receive regulator events. | |
1912 | */ | |
1913 | int regulator_register_notifier(struct regulator *regulator, | |
1914 | struct notifier_block *nb) | |
1915 | { | |
1916 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1917 | nb); | |
1918 | } | |
1919 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1920 | ||
1921 | /** | |
1922 | * regulator_unregister_notifier - unregister regulator event notifier | |
1923 | * @regulator: regulator source | |
69279fb9 | 1924 | * @nb: notifier block |
414c70cb LG |
1925 | * |
1926 | * Unregister regulator event notifier block. | |
1927 | */ | |
1928 | int regulator_unregister_notifier(struct regulator *regulator, | |
1929 | struct notifier_block *nb) | |
1930 | { | |
1931 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1932 | nb); | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1935 | ||
b136fb44 JC |
1936 | /* notify regulator consumers and downstream regulator consumers. |
1937 | * Note mutex must be held by caller. | |
1938 | */ | |
414c70cb LG |
1939 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1940 | unsigned long event, void *data) | |
1941 | { | |
1942 | struct regulator_dev *_rdev; | |
1943 | ||
1944 | /* call rdev chain first */ | |
414c70cb | 1945 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1946 | |
1947 | /* now notify regulator we supply */ | |
b136fb44 | 1948 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
1949 | mutex_lock(&_rdev->mutex); |
1950 | _notifier_call_chain(_rdev, event, data); | |
1951 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 1952 | } |
414c70cb LG |
1953 | } |
1954 | ||
1955 | /** | |
1956 | * regulator_bulk_get - get multiple regulator consumers | |
1957 | * | |
1958 | * @dev: Device to supply | |
1959 | * @num_consumers: Number of consumers to register | |
1960 | * @consumers: Configuration of consumers; clients are stored here. | |
1961 | * | |
1962 | * @return 0 on success, an errno on failure. | |
1963 | * | |
1964 | * This helper function allows drivers to get several regulator | |
1965 | * consumers in one operation. If any of the regulators cannot be | |
1966 | * acquired then any regulators that were allocated will be freed | |
1967 | * before returning to the caller. | |
1968 | */ | |
1969 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1970 | struct regulator_bulk_data *consumers) | |
1971 | { | |
1972 | int i; | |
1973 | int ret; | |
1974 | ||
1975 | for (i = 0; i < num_consumers; i++) | |
1976 | consumers[i].consumer = NULL; | |
1977 | ||
1978 | for (i = 0; i < num_consumers; i++) { | |
1979 | consumers[i].consumer = regulator_get(dev, | |
1980 | consumers[i].supply); | |
1981 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 1982 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
1983 | dev_err(dev, "Failed to get supply '%s': %d\n", |
1984 | consumers[i].supply, ret); | |
414c70cb LG |
1985 | consumers[i].consumer = NULL; |
1986 | goto err; | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | return 0; | |
1991 | ||
1992 | err: | |
1993 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1994 | regulator_put(consumers[i].consumer); | |
1995 | ||
1996 | return ret; | |
1997 | } | |
1998 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1999 | ||
2000 | /** | |
2001 | * regulator_bulk_enable - enable multiple regulator consumers | |
2002 | * | |
2003 | * @num_consumers: Number of consumers | |
2004 | * @consumers: Consumer data; clients are stored here. | |
2005 | * @return 0 on success, an errno on failure | |
2006 | * | |
2007 | * This convenience API allows consumers to enable multiple regulator | |
2008 | * clients in a single API call. If any consumers cannot be enabled | |
2009 | * then any others that were enabled will be disabled again prior to | |
2010 | * return. | |
2011 | */ | |
2012 | int regulator_bulk_enable(int num_consumers, | |
2013 | struct regulator_bulk_data *consumers) | |
2014 | { | |
2015 | int i; | |
2016 | int ret; | |
2017 | ||
2018 | for (i = 0; i < num_consumers; i++) { | |
2019 | ret = regulator_enable(consumers[i].consumer); | |
2020 | if (ret != 0) | |
2021 | goto err; | |
2022 | } | |
2023 | ||
2024 | return 0; | |
2025 | ||
2026 | err: | |
5b307627 | 2027 | printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2028 | for (--i; i >= 0; --i) |
414c70cb LG |
2029 | regulator_disable(consumers[i].consumer); |
2030 | ||
2031 | return ret; | |
2032 | } | |
2033 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2034 | ||
2035 | /** | |
2036 | * regulator_bulk_disable - disable multiple regulator consumers | |
2037 | * | |
2038 | * @num_consumers: Number of consumers | |
2039 | * @consumers: Consumer data; clients are stored here. | |
2040 | * @return 0 on success, an errno on failure | |
2041 | * | |
2042 | * This convenience API allows consumers to disable multiple regulator | |
2043 | * clients in a single API call. If any consumers cannot be enabled | |
2044 | * then any others that were disabled will be disabled again prior to | |
2045 | * return. | |
2046 | */ | |
2047 | int regulator_bulk_disable(int num_consumers, | |
2048 | struct regulator_bulk_data *consumers) | |
2049 | { | |
2050 | int i; | |
2051 | int ret; | |
2052 | ||
2053 | for (i = 0; i < num_consumers; i++) { | |
2054 | ret = regulator_disable(consumers[i].consumer); | |
2055 | if (ret != 0) | |
2056 | goto err; | |
2057 | } | |
2058 | ||
2059 | return 0; | |
2060 | ||
2061 | err: | |
5b307627 MB |
2062 | printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, |
2063 | ret); | |
eb143ac1 | 2064 | for (--i; i >= 0; --i) |
414c70cb LG |
2065 | regulator_enable(consumers[i].consumer); |
2066 | ||
2067 | return ret; | |
2068 | } | |
2069 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2070 | ||
2071 | /** | |
2072 | * regulator_bulk_free - free multiple regulator consumers | |
2073 | * | |
2074 | * @num_consumers: Number of consumers | |
2075 | * @consumers: Consumer data; clients are stored here. | |
2076 | * | |
2077 | * This convenience API allows consumers to free multiple regulator | |
2078 | * clients in a single API call. | |
2079 | */ | |
2080 | void regulator_bulk_free(int num_consumers, | |
2081 | struct regulator_bulk_data *consumers) | |
2082 | { | |
2083 | int i; | |
2084 | ||
2085 | for (i = 0; i < num_consumers; i++) { | |
2086 | regulator_put(consumers[i].consumer); | |
2087 | consumers[i].consumer = NULL; | |
2088 | } | |
2089 | } | |
2090 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2091 | ||
2092 | /** | |
2093 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2094 | * @rdev: regulator source |
414c70cb | 2095 | * @event: notifier block |
69279fb9 | 2096 | * @data: callback-specific data. |
414c70cb LG |
2097 | * |
2098 | * Called by regulator drivers to notify clients a regulator event has | |
2099 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2100 | * Note lock must be held by caller. |
414c70cb LG |
2101 | */ |
2102 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2103 | unsigned long event, void *data) | |
2104 | { | |
2105 | _notifier_call_chain(rdev, event, data); | |
2106 | return NOTIFY_DONE; | |
2107 | ||
2108 | } | |
2109 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2110 | ||
be721979 MB |
2111 | /** |
2112 | * regulator_mode_to_status - convert a regulator mode into a status | |
2113 | * | |
2114 | * @mode: Mode to convert | |
2115 | * | |
2116 | * Convert a regulator mode into a status. | |
2117 | */ | |
2118 | int regulator_mode_to_status(unsigned int mode) | |
2119 | { | |
2120 | switch (mode) { | |
2121 | case REGULATOR_MODE_FAST: | |
2122 | return REGULATOR_STATUS_FAST; | |
2123 | case REGULATOR_MODE_NORMAL: | |
2124 | return REGULATOR_STATUS_NORMAL; | |
2125 | case REGULATOR_MODE_IDLE: | |
2126 | return REGULATOR_STATUS_IDLE; | |
2127 | case REGULATOR_STATUS_STANDBY: | |
2128 | return REGULATOR_STATUS_STANDBY; | |
2129 | default: | |
2130 | return 0; | |
2131 | } | |
2132 | } | |
2133 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2134 | ||
7ad68e2f DB |
2135 | /* |
2136 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2137 | * create attributes that can be meaningfully displayed. | |
2138 | */ | |
2139 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2140 | { | |
2141 | struct device *dev = &rdev->dev; | |
2142 | struct regulator_ops *ops = rdev->desc->ops; | |
2143 | int status = 0; | |
2144 | ||
2145 | /* some attributes need specific methods to be displayed */ | |
2146 | if (ops->get_voltage) { | |
2147 | status = device_create_file(dev, &dev_attr_microvolts); | |
2148 | if (status < 0) | |
2149 | return status; | |
2150 | } | |
2151 | if (ops->get_current_limit) { | |
2152 | status = device_create_file(dev, &dev_attr_microamps); | |
2153 | if (status < 0) | |
2154 | return status; | |
2155 | } | |
2156 | if (ops->get_mode) { | |
2157 | status = device_create_file(dev, &dev_attr_opmode); | |
2158 | if (status < 0) | |
2159 | return status; | |
2160 | } | |
2161 | if (ops->is_enabled) { | |
2162 | status = device_create_file(dev, &dev_attr_state); | |
2163 | if (status < 0) | |
2164 | return status; | |
2165 | } | |
853116a1 DB |
2166 | if (ops->get_status) { |
2167 | status = device_create_file(dev, &dev_attr_status); | |
2168 | if (status < 0) | |
2169 | return status; | |
2170 | } | |
7ad68e2f DB |
2171 | |
2172 | /* some attributes are type-specific */ | |
2173 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2174 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2175 | if (status < 0) | |
2176 | return status; | |
2177 | } | |
2178 | ||
2179 | /* all the other attributes exist to support constraints; | |
2180 | * don't show them if there are no constraints, or if the | |
2181 | * relevant supporting methods are missing. | |
2182 | */ | |
2183 | if (!rdev->constraints) | |
2184 | return status; | |
2185 | ||
2186 | /* constraints need specific supporting methods */ | |
2187 | if (ops->set_voltage) { | |
2188 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2189 | if (status < 0) | |
2190 | return status; | |
2191 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2192 | if (status < 0) | |
2193 | return status; | |
2194 | } | |
2195 | if (ops->set_current_limit) { | |
2196 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2197 | if (status < 0) | |
2198 | return status; | |
2199 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2200 | if (status < 0) | |
2201 | return status; | |
2202 | } | |
2203 | ||
2204 | /* suspend mode constraints need multiple supporting methods */ | |
2205 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2206 | return status; | |
2207 | ||
2208 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2209 | if (status < 0) | |
2210 | return status; | |
2211 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2212 | if (status < 0) | |
2213 | return status; | |
2214 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2215 | if (status < 0) | |
2216 | return status; | |
2217 | ||
2218 | if (ops->set_suspend_voltage) { | |
2219 | status = device_create_file(dev, | |
2220 | &dev_attr_suspend_standby_microvolts); | |
2221 | if (status < 0) | |
2222 | return status; | |
2223 | status = device_create_file(dev, | |
2224 | &dev_attr_suspend_mem_microvolts); | |
2225 | if (status < 0) | |
2226 | return status; | |
2227 | status = device_create_file(dev, | |
2228 | &dev_attr_suspend_disk_microvolts); | |
2229 | if (status < 0) | |
2230 | return status; | |
2231 | } | |
2232 | ||
2233 | if (ops->set_suspend_mode) { | |
2234 | status = device_create_file(dev, | |
2235 | &dev_attr_suspend_standby_mode); | |
2236 | if (status < 0) | |
2237 | return status; | |
2238 | status = device_create_file(dev, | |
2239 | &dev_attr_suspend_mem_mode); | |
2240 | if (status < 0) | |
2241 | return status; | |
2242 | status = device_create_file(dev, | |
2243 | &dev_attr_suspend_disk_mode); | |
2244 | if (status < 0) | |
2245 | return status; | |
2246 | } | |
2247 | ||
2248 | return status; | |
2249 | } | |
2250 | ||
414c70cb LG |
2251 | /** |
2252 | * regulator_register - register regulator | |
69279fb9 MB |
2253 | * @regulator_desc: regulator to register |
2254 | * @dev: struct device for the regulator | |
0527100f | 2255 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2256 | * @driver_data: private regulator data |
414c70cb LG |
2257 | * |
2258 | * Called by regulator drivers to register a regulator. | |
2259 | * Returns 0 on success. | |
2260 | */ | |
2261 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
2262 | struct device *dev, struct regulator_init_data *init_data, |
2263 | void *driver_data) | |
414c70cb LG |
2264 | { |
2265 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2266 | struct regulator_dev *rdev; | |
a5766f11 | 2267 | int ret, i; |
414c70cb LG |
2268 | |
2269 | if (regulator_desc == NULL) | |
2270 | return ERR_PTR(-EINVAL); | |
2271 | ||
2272 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2273 | return ERR_PTR(-EINVAL); | |
2274 | ||
cd78dfc6 DL |
2275 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2276 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2277 | return ERR_PTR(-EINVAL); |
2278 | ||
46fabe1e MB |
2279 | if (!init_data) |
2280 | return ERR_PTR(-EINVAL); | |
2281 | ||
414c70cb LG |
2282 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2283 | if (rdev == NULL) | |
2284 | return ERR_PTR(-ENOMEM); | |
2285 | ||
2286 | mutex_lock(®ulator_list_mutex); | |
2287 | ||
2288 | mutex_init(&rdev->mutex); | |
a5766f11 | 2289 | rdev->reg_data = driver_data; |
414c70cb LG |
2290 | rdev->owner = regulator_desc->owner; |
2291 | rdev->desc = regulator_desc; | |
2292 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2293 | INIT_LIST_HEAD(&rdev->supply_list); | |
2294 | INIT_LIST_HEAD(&rdev->list); | |
2295 | INIT_LIST_HEAD(&rdev->slist); | |
2296 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2297 | ||
a5766f11 LG |
2298 | /* preform any regulator specific init */ |
2299 | if (init_data->regulator_init) { | |
2300 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2301 | if (ret < 0) |
2302 | goto clean; | |
a5766f11 LG |
2303 | } |
2304 | ||
a5766f11 | 2305 | /* register with sysfs */ |
414c70cb | 2306 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2307 | rdev->dev.parent = dev; |
812460a9 KS |
2308 | dev_set_name(&rdev->dev, "regulator.%d", |
2309 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2310 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2311 | if (ret != 0) { |
2312 | put_device(&rdev->dev); | |
4fca9545 | 2313 | goto clean; |
ad7725cb | 2314 | } |
a5766f11 LG |
2315 | |
2316 | dev_set_drvdata(&rdev->dev, rdev); | |
2317 | ||
74f544c1 MR |
2318 | /* set regulator constraints */ |
2319 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2320 | if (ret < 0) | |
2321 | goto scrub; | |
2322 | ||
7ad68e2f DB |
2323 | /* add attributes supported by this regulator */ |
2324 | ret = add_regulator_attributes(rdev); | |
2325 | if (ret < 0) | |
2326 | goto scrub; | |
2327 | ||
a5766f11 | 2328 | /* set supply regulator if it exists */ |
0178f3e2 MB |
2329 | if (init_data->supply_regulator && init_data->supply_regulator_dev) { |
2330 | dev_err(dev, | |
2331 | "Supply regulator specified by both name and dev\n"); | |
2332 | goto scrub; | |
2333 | } | |
2334 | ||
2335 | if (init_data->supply_regulator) { | |
2336 | struct regulator_dev *r; | |
2337 | int found = 0; | |
2338 | ||
2339 | list_for_each_entry(r, ®ulator_list, list) { | |
2340 | if (strcmp(rdev_get_name(r), | |
2341 | init_data->supply_regulator) == 0) { | |
2342 | found = 1; | |
2343 | break; | |
2344 | } | |
2345 | } | |
2346 | ||
2347 | if (!found) { | |
2348 | dev_err(dev, "Failed to find supply %s\n", | |
2349 | init_data->supply_regulator); | |
2350 | goto scrub; | |
2351 | } | |
2352 | ||
2353 | ret = set_supply(rdev, r); | |
2354 | if (ret < 0) | |
2355 | goto scrub; | |
2356 | } | |
2357 | ||
a5766f11 | 2358 | if (init_data->supply_regulator_dev) { |
0178f3e2 | 2359 | dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); |
a5766f11 LG |
2360 | ret = set_supply(rdev, |
2361 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2362 | if (ret < 0) |
2363 | goto scrub; | |
a5766f11 LG |
2364 | } |
2365 | ||
2366 | /* add consumers devices */ | |
2367 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2368 | ret = set_consumer_device_supply(rdev, | |
2369 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2370 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2371 | init_data->consumer_supplies[i].supply); |
d4033b54 JN |
2372 | if (ret < 0) |
2373 | goto unset_supplies; | |
414c70cb | 2374 | } |
a5766f11 LG |
2375 | |
2376 | list_add(&rdev->list, ®ulator_list); | |
2377 | out: | |
414c70cb LG |
2378 | mutex_unlock(®ulator_list_mutex); |
2379 | return rdev; | |
4fca9545 | 2380 | |
d4033b54 JN |
2381 | unset_supplies: |
2382 | unset_regulator_supplies(rdev); | |
2383 | ||
4fca9545 DB |
2384 | scrub: |
2385 | device_unregister(&rdev->dev); | |
53032daf PW |
2386 | /* device core frees rdev */ |
2387 | rdev = ERR_PTR(ret); | |
2388 | goto out; | |
2389 | ||
4fca9545 DB |
2390 | clean: |
2391 | kfree(rdev); | |
2392 | rdev = ERR_PTR(ret); | |
2393 | goto out; | |
414c70cb LG |
2394 | } |
2395 | EXPORT_SYMBOL_GPL(regulator_register); | |
2396 | ||
2397 | /** | |
2398 | * regulator_unregister - unregister regulator | |
69279fb9 | 2399 | * @rdev: regulator to unregister |
414c70cb LG |
2400 | * |
2401 | * Called by regulator drivers to unregister a regulator. | |
2402 | */ | |
2403 | void regulator_unregister(struct regulator_dev *rdev) | |
2404 | { | |
2405 | if (rdev == NULL) | |
2406 | return; | |
2407 | ||
2408 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2409 | WARN_ON(rdev->open_count); |
0f1d747b | 2410 | unset_regulator_supplies(rdev); |
414c70cb LG |
2411 | list_del(&rdev->list); |
2412 | if (rdev->supply) | |
2413 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2414 | device_unregister(&rdev->dev); | |
2415 | mutex_unlock(®ulator_list_mutex); | |
2416 | } | |
2417 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2418 | ||
414c70cb | 2419 | /** |
cf7bbcdf | 2420 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2421 | * @state: system suspend state |
2422 | * | |
2423 | * Configure each regulator with it's suspend operating parameters for state. | |
2424 | * This will usually be called by machine suspend code prior to supending. | |
2425 | */ | |
2426 | int regulator_suspend_prepare(suspend_state_t state) | |
2427 | { | |
2428 | struct regulator_dev *rdev; | |
2429 | int ret = 0; | |
2430 | ||
2431 | /* ON is handled by regulator active state */ | |
2432 | if (state == PM_SUSPEND_ON) | |
2433 | return -EINVAL; | |
2434 | ||
2435 | mutex_lock(®ulator_list_mutex); | |
2436 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2437 | ||
2438 | mutex_lock(&rdev->mutex); | |
2439 | ret = suspend_prepare(rdev, state); | |
2440 | mutex_unlock(&rdev->mutex); | |
2441 | ||
2442 | if (ret < 0) { | |
2443 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1083c393 | 2444 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
2445 | goto out; |
2446 | } | |
2447 | } | |
2448 | out: | |
2449 | mutex_unlock(®ulator_list_mutex); | |
2450 | return ret; | |
2451 | } | |
2452 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2453 | ||
ca725561 MB |
2454 | /** |
2455 | * regulator_has_full_constraints - the system has fully specified constraints | |
2456 | * | |
2457 | * Calling this function will cause the regulator API to disable all | |
2458 | * regulators which have a zero use count and don't have an always_on | |
2459 | * constraint in a late_initcall. | |
2460 | * | |
2461 | * The intention is that this will become the default behaviour in a | |
2462 | * future kernel release so users are encouraged to use this facility | |
2463 | * now. | |
2464 | */ | |
2465 | void regulator_has_full_constraints(void) | |
2466 | { | |
2467 | has_full_constraints = 1; | |
2468 | } | |
2469 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2470 | ||
688fe99a MB |
2471 | /** |
2472 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2473 | * | |
2474 | * Calling this function will cause the regulator API to provide a | |
2475 | * dummy regulator to consumers if no physical regulator is found, | |
2476 | * allowing most consumers to proceed as though a regulator were | |
2477 | * configured. This allows systems such as those with software | |
2478 | * controllable regulators for the CPU core only to be brought up more | |
2479 | * readily. | |
2480 | */ | |
2481 | void regulator_use_dummy_regulator(void) | |
2482 | { | |
2483 | board_wants_dummy_regulator = true; | |
2484 | } | |
2485 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2486 | ||
414c70cb LG |
2487 | /** |
2488 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2489 | * @rdev: regulator |
414c70cb LG |
2490 | * |
2491 | * Get rdev regulator driver private data. This call can be used in the | |
2492 | * regulator driver context. | |
2493 | */ | |
2494 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2495 | { | |
2496 | return rdev->reg_data; | |
2497 | } | |
2498 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2499 | ||
2500 | /** | |
2501 | * regulator_get_drvdata - get regulator driver data | |
2502 | * @regulator: regulator | |
2503 | * | |
2504 | * Get regulator driver private data. This call can be used in the consumer | |
2505 | * driver context when non API regulator specific functions need to be called. | |
2506 | */ | |
2507 | void *regulator_get_drvdata(struct regulator *regulator) | |
2508 | { | |
2509 | return regulator->rdev->reg_data; | |
2510 | } | |
2511 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2512 | ||
2513 | /** | |
2514 | * regulator_set_drvdata - set regulator driver data | |
2515 | * @regulator: regulator | |
2516 | * @data: data | |
2517 | */ | |
2518 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2519 | { | |
2520 | regulator->rdev->reg_data = data; | |
2521 | } | |
2522 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2523 | ||
2524 | /** | |
2525 | * regulator_get_id - get regulator ID | |
69279fb9 | 2526 | * @rdev: regulator |
414c70cb LG |
2527 | */ |
2528 | int rdev_get_id(struct regulator_dev *rdev) | |
2529 | { | |
2530 | return rdev->desc->id; | |
2531 | } | |
2532 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2533 | ||
a5766f11 LG |
2534 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2535 | { | |
2536 | return &rdev->dev; | |
2537 | } | |
2538 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2539 | ||
2540 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2541 | { | |
2542 | return reg_init_data->driver_data; | |
2543 | } | |
2544 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2545 | ||
414c70cb LG |
2546 | static int __init regulator_init(void) |
2547 | { | |
34abbd68 MB |
2548 | int ret; |
2549 | ||
414c70cb | 2550 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); |
34abbd68 MB |
2551 | |
2552 | ret = class_register(®ulator_class); | |
2553 | ||
2554 | regulator_dummy_init(); | |
2555 | ||
2556 | return ret; | |
414c70cb LG |
2557 | } |
2558 | ||
2559 | /* init early to allow our consumers to complete system booting */ | |
2560 | core_initcall(regulator_init); | |
ca725561 MB |
2561 | |
2562 | static int __init regulator_init_complete(void) | |
2563 | { | |
2564 | struct regulator_dev *rdev; | |
2565 | struct regulator_ops *ops; | |
2566 | struct regulation_constraints *c; | |
2567 | int enabled, ret; | |
2568 | const char *name; | |
2569 | ||
2570 | mutex_lock(®ulator_list_mutex); | |
2571 | ||
2572 | /* If we have a full configuration then disable any regulators | |
2573 | * which are not in use or always_on. This will become the | |
2574 | * default behaviour in the future. | |
2575 | */ | |
2576 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2577 | ops = rdev->desc->ops; | |
2578 | c = rdev->constraints; | |
2579 | ||
1083c393 | 2580 | name = rdev_get_name(rdev); |
ca725561 | 2581 | |
f25e0b4f | 2582 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2583 | continue; |
2584 | ||
2585 | mutex_lock(&rdev->mutex); | |
2586 | ||
2587 | if (rdev->use_count) | |
2588 | goto unlock; | |
2589 | ||
2590 | /* If we can't read the status assume it's on. */ | |
2591 | if (ops->is_enabled) | |
2592 | enabled = ops->is_enabled(rdev); | |
2593 | else | |
2594 | enabled = 1; | |
2595 | ||
2596 | if (!enabled) | |
2597 | goto unlock; | |
2598 | ||
2599 | if (has_full_constraints) { | |
2600 | /* We log since this may kill the system if it | |
2601 | * goes wrong. */ | |
2602 | printk(KERN_INFO "%s: disabling %s\n", | |
2603 | __func__, name); | |
2604 | ret = ops->disable(rdev); | |
2605 | if (ret != 0) { | |
2606 | printk(KERN_ERR | |
2607 | "%s: couldn't disable %s: %d\n", | |
2608 | __func__, name, ret); | |
2609 | } | |
2610 | } else { | |
2611 | /* The intention is that in future we will | |
2612 | * assume that full constraints are provided | |
2613 | * so warn even if we aren't going to do | |
2614 | * anything here. | |
2615 | */ | |
2616 | printk(KERN_WARNING | |
2617 | "%s: incomplete constraints, leaving %s on\n", | |
2618 | __func__, name); | |
2619 | } | |
2620 | ||
2621 | unlock: | |
2622 | mutex_unlock(&rdev->mutex); | |
2623 | } | |
2624 | ||
2625 | mutex_unlock(®ulator_list_mutex); | |
2626 | ||
2627 | return 0; | |
2628 | } | |
2629 | late_initcall(regulator_init_complete); |