blob: 8f785bc9e5108519525f0908b3d3e3d097b67816 [file] [log] [blame]
Mark Brown0cdfcc02013-09-11 13:15:40 +01001/*
2 * devres.c -- Voltage/Current Regulator framework devres implementation.
3 *
4 * Copyright 2013 Linaro Ltd
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/err.h>
15#include <linux/regmap.h>
16#include <linux/regulator/consumer.h>
17#include <linux/regulator/driver.h>
18#include <linux/module.h>
19
20#include "internal.h"
21
22enum {
23 NORMAL_GET,
24 EXCLUSIVE_GET,
25 OPTIONAL_GET,
26};
27
28static void devm_regulator_release(struct device *dev, void *res)
29{
30 regulator_put(*(struct regulator **)res);
31}
32
33static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
34 int get_type)
35{
36 struct regulator **ptr, *regulator;
37
38 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
39 if (!ptr)
40 return ERR_PTR(-ENOMEM);
41
42 switch (get_type) {
43 case NORMAL_GET:
44 regulator = regulator_get(dev, id);
45 break;
46 case EXCLUSIVE_GET:
47 regulator = regulator_get_exclusive(dev, id);
48 break;
49 case OPTIONAL_GET:
50 regulator = regulator_get_optional(dev, id);
51 break;
52 default:
53 regulator = ERR_PTR(-EINVAL);
54 }
55
56 if (!IS_ERR(regulator)) {
57 *ptr = regulator;
58 devres_add(dev, ptr);
59 } else {
60 devres_free(ptr);
61 }
62
63 return regulator;
64}
65
66/**
67 * devm_regulator_get - Resource managed regulator_get()
68 * @dev: device for regulator "consumer"
69 * @id: Supply name or regulator ID.
70 *
71 * Managed regulator_get(). Regulators returned from this function are
72 * automatically regulator_put() on driver detach. See regulator_get() for more
73 * information.
74 */
75struct regulator *devm_regulator_get(struct device *dev, const char *id)
76{
77 return _devm_regulator_get(dev, id, NORMAL_GET);
78}
79EXPORT_SYMBOL_GPL(devm_regulator_get);
80
81/**
82 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
83 * @dev: device for regulator "consumer"
84 * @id: Supply name or regulator ID.
85 *
86 * Managed regulator_get_exclusive(). Regulators returned from this function
87 * are automatically regulator_put() on driver detach. See regulator_get() for
88 * more information.
89 */
90struct regulator *devm_regulator_get_exclusive(struct device *dev,
91 const char *id)
92{
93 return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
94}
95EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
96
97/**
98 * devm_regulator_get_optional - Resource managed regulator_get_optional()
99 * @dev: device for regulator "consumer"
100 * @id: Supply name or regulator ID.
101 *
102 * Managed regulator_get_optional(). Regulators returned from this
103 * function are automatically regulator_put() on driver detach. See
104 * regulator_get_optional() for more information.
105 */
106struct regulator *devm_regulator_get_optional(struct device *dev,
107 const char *id)
108{
109 return _devm_regulator_get(dev, id, OPTIONAL_GET);
110}
111EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
112
113static int devm_regulator_match(struct device *dev, void *res, void *data)
114{
115 struct regulator **r = res;
116 if (!r || !*r) {
117 WARN_ON(!r || !*r);
118 return 0;
119 }
120 return *r == data;
121}
122
123/**
124 * devm_regulator_put - Resource managed regulator_put()
125 * @regulator: regulator to free
126 *
127 * Deallocate a regulator allocated with devm_regulator_get(). Normally
128 * this function will not need to be called and the resource management
129 * code will ensure that the resource is freed.
130 */
131void devm_regulator_put(struct regulator *regulator)
132{
133 int rc;
134
135 rc = devres_release(regulator->dev, devm_regulator_release,
136 devm_regulator_match, regulator);
137 if (rc != 0)
138 WARN_ON(rc);
139}
140EXPORT_SYMBOL_GPL(devm_regulator_put);
141
142/**
143 * devm_regulator_bulk_get - managed get multiple regulator consumers
144 *
145 * @dev: Device to supply
146 * @num_consumers: Number of consumers to register
147 * @consumers: Configuration of consumers; clients are stored here.
148 *
149 * @return 0 on success, an errno on failure.
150 *
151 * This helper function allows drivers to get several regulator
152 * consumers in one operation with management, the regulators will
153 * automatically be freed when the device is unbound. If any of the
154 * regulators cannot be acquired then any regulators that were
155 * allocated will be freed before returning to the caller.
156 */
157int devm_regulator_bulk_get(struct device *dev, int num_consumers,
158 struct regulator_bulk_data *consumers)
159{
160 int i;
161 int ret;
162
163 for (i = 0; i < num_consumers; i++)
164 consumers[i].consumer = NULL;
165
166 for (i = 0; i < num_consumers; i++) {
167 consumers[i].consumer = devm_regulator_get(dev,
168 consumers[i].supply);
169 if (IS_ERR(consumers[i].consumer)) {
170 ret = PTR_ERR(consumers[i].consumer);
171 dev_err(dev, "Failed to get supply '%s': %d\n",
172 consumers[i].supply, ret);
173 consumers[i].consumer = NULL;
174 goto err;
175 }
176 }
177
178 return 0;
179
180err:
181 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
182 devm_regulator_put(consumers[i].consumer);
183
184 return ret;
185}
186EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
187
188static void devm_rdev_release(struct device *dev, void *res)
189{
190 regulator_unregister(*(struct regulator_dev **)res);
191}
192
193/**
194 * devm_regulator_register - Resource managed regulator_register()
195 * @regulator_desc: regulator to register
196 * @config: runtime configuration for regulator
197 *
198 * Called by regulator drivers to register a regulator. Returns a
199 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
200 * error. The regulator will automatically be released when the device
201 * is unbound.
202 */
203struct regulator_dev *devm_regulator_register(struct device *dev,
204 const struct regulator_desc *regulator_desc,
205 const struct regulator_config *config)
206{
207 struct regulator_dev **ptr, *rdev;
208
209 ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
210 GFP_KERNEL);
211 if (!ptr)
212 return ERR_PTR(-ENOMEM);
213
214 rdev = regulator_register(regulator_desc, config);
215 if (!IS_ERR(rdev)) {
216 *ptr = rdev;
217 devres_add(dev, ptr);
218 } else {
219 devres_free(ptr);
220 }
221
222 return rdev;
223}
224EXPORT_SYMBOL_GPL(devm_regulator_register);
225
226static int devm_rdev_match(struct device *dev, void *res, void *data)
227{
228 struct regulator_dev **r = res;
229 if (!r || !*r) {
230 WARN_ON(!r || !*r);
231 return 0;
232 }
233 return *r == data;
234}
235
236/**
237 * devm_regulator_unregister - Resource managed regulator_unregister()
238 * @regulator: regulator to free
239 *
240 * Unregister a regulator registered with devm_regulator_register().
241 * Normally this function will not need to be called and the resource
242 * management code will ensure that the resource is freed.
243 */
244void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev)
245{
246 int rc;
247
248 rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
249 if (rc != 0)
250 WARN_ON(rc);
251}
252EXPORT_SYMBOL_GPL(devm_regulator_unregister);
Charles Keepaxa06ccd92013-10-15 20:14:20 +0100253
254struct regulator_supply_alias_match {
255 struct device *dev;
256 const char *id;
257};
258
259static int devm_regulator_match_supply_alias(struct device *dev, void *res,
260 void *data)
261{
262 struct regulator_supply_alias_match *match = res;
263 struct regulator_supply_alias_match *target = data;
264
265 return match->dev == target->dev && strcmp(match->id, target->id) == 0;
266}
267
268static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
269{
270 struct regulator_supply_alias_match *match = res;
271
272 regulator_unregister_supply_alias(match->dev, match->id);
273}
274
275/**
276 * devm_regulator_register_supply_alias - Resource managed
277 * regulator_register_supply_alias()
278 *
279 * @dev: device that will be given as the regulator "consumer"
280 * @id: Supply name or regulator ID
281 * @alias_dev: device that should be used to lookup the supply
282 * @alias_id: Supply name or regulator ID that should be used to lookup the
283 * supply
284 *
285 * The supply alias will automatically be unregistered when the source
286 * device is unbound.
287 */
288int devm_regulator_register_supply_alias(struct device *dev, const char *id,
289 struct device *alias_dev,
290 const char *alias_id)
291{
292 struct regulator_supply_alias_match *match;
293 int ret;
294
295 match = devres_alloc(devm_regulator_destroy_supply_alias,
296 sizeof(struct regulator_supply_alias_match),
297 GFP_KERNEL);
298 if (!match)
299 return -ENOMEM;
300
301 match->dev = dev;
302 match->id = id;
303
304 ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
305 if (ret < 0) {
306 devres_free(match);
307 return ret;
308 }
309
310 devres_add(dev, match);
311
312 return 0;
313}
314EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
315
316/**
317 * devm_regulator_unregister_supply_alias - Resource managed
318 * regulator_unregister_supply_alias()
319 *
320 * @dev: device that will be given as the regulator "consumer"
321 * @id: Supply name or regulator ID
322 *
323 * Unregister an alias registered with
324 * devm_regulator_register_supply_alias(). Normally this function
325 * will not need to be called and the resource management code
326 * will ensure that the resource is freed.
327 */
328void devm_regulator_unregister_supply_alias(struct device *dev, const char *id)
329{
330 struct regulator_supply_alias_match match;
331 int rc;
332
333 match.dev = dev;
334 match.id = id;
335
336 rc = devres_release(dev, devm_regulator_destroy_supply_alias,
337 devm_regulator_match_supply_alias, &match);
338 if (rc != 0)
339 WARN_ON(rc);
340}
341EXPORT_SYMBOL_GPL(devm_regulator_unregister_supply_alias);
342
343/**
344 * devm_regulator_bulk_register_supply_alias - Managed register
345 * multiple aliases
346 *
347 * @dev: device that will be given as the regulator "consumer"
348 * @id: List of supply names or regulator IDs
349 * @alias_dev: device that should be used to lookup the supply
350 * @alias_id: List of supply names or regulator IDs that should be used to
351 * lookup the supply
352 * @num_id: Number of aliases to register
353 *
354 * @return 0 on success, an errno on failure.
355 *
356 * This helper function allows drivers to register several supply
357 * aliases in one operation, the aliases will be automatically
358 * unregisters when the source device is unbound. If any of the
359 * aliases cannot be registered any aliases that were registered
360 * will be removed before returning to the caller.
361 */
362int devm_regulator_bulk_register_supply_alias(struct device *dev,
Lee Jones9f8c0fe2014-05-23 16:44:10 +0100363 const char *const *id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +0100364 struct device *alias_dev,
Lee Jones9f8c0fe2014-05-23 16:44:10 +0100365 const char *const *alias_id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +0100366 int num_id)
367{
368 int i;
369 int ret;
370
371 for (i = 0; i < num_id; ++i) {
372 ret = devm_regulator_register_supply_alias(dev, id[i],
373 alias_dev,
374 alias_id[i]);
375 if (ret < 0)
376 goto err;
377 }
378
379 return 0;
380
381err:
382 dev_err(dev,
383 "Failed to create supply alias %s,%s -> %s,%s\n",
384 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
385
386 while (--i >= 0)
387 devm_regulator_unregister_supply_alias(dev, id[i]);
388
389 return ret;
390}
391EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
392
393/**
394 * devm_regulator_bulk_unregister_supply_alias - Managed unregister
395 * multiple aliases
396 *
397 * @dev: device that will be given as the regulator "consumer"
398 * @id: List of supply names or regulator IDs
399 * @num_id: Number of aliases to unregister
400 *
401 * Unregister aliases registered with
402 * devm_regulator_bulk_register_supply_alias(). Normally this function
403 * will not need to be called and the resource management code
404 * will ensure that the resource is freed.
405 */
406void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
Lee Jones9f8c0fe2014-05-23 16:44:10 +0100407 const char *const *id,
Charles Keepaxa06ccd92013-10-15 20:14:20 +0100408 int num_id)
409{
410 int i;
411
412 for (i = 0; i < num_id; ++i)
413 devm_regulator_unregister_supply_alias(dev, id[i]);
414}
415EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);