devres.c 13.3 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
/*
 * devres.c  --  Voltage/Current Regulator framework devres implementation.
 *
 * Copyright 2013 Linaro Ltd
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>

#include "internal.h"

enum {
	NORMAL_GET,
	EXCLUSIVE_GET,
	OPTIONAL_GET,
};

static void devm_regulator_release(struct device *dev, void *res)
{
	regulator_put(*(struct regulator **)res);
}

static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
					     int get_type)
{
	struct regulator **ptr, *regulator;

	ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	switch (get_type) {
	case NORMAL_GET:
		regulator = regulator_get(dev, id);
		break;
	case EXCLUSIVE_GET:
		regulator = regulator_get_exclusive(dev, id);
		break;
	case OPTIONAL_GET:
		regulator = regulator_get_optional(dev, id);
		break;
	default:
		regulator = ERR_PTR(-EINVAL);
	}

	if (!IS_ERR(regulator)) {
		*ptr = regulator;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return regulator;
}

/**
 * devm_regulator_get - Resource managed regulator_get()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get(). Regulators returned from this function are
 * automatically regulator_put() on driver detach. See regulator_get() for more
 * information.
 */
struct regulator *devm_regulator_get(struct device *dev, const char *id)
{
	return _devm_regulator_get(dev, id, NORMAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get);

/**
 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get_exclusive(). Regulators returned from this function
 * are automatically regulator_put() on driver detach. See regulator_get() for
 * more information.
 */
struct regulator *devm_regulator_get_exclusive(struct device *dev,
					       const char *id)
{
	return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);

/**
 * devm_regulator_get_optional - Resource managed regulator_get_optional()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get_optional(). Regulators returned from this
 * function are automatically regulator_put() on driver detach. See
 * regulator_get_optional() for more information.
 */
struct regulator *devm_regulator_get_optional(struct device *dev,
					      const char *id)
{
	return _devm_regulator_get(dev, id, OPTIONAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_optional);

static int devm_regulator_match(struct device *dev, void *res, void *data)
{
	struct regulator **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}

/**
 * devm_regulator_put - Resource managed regulator_put()
 * @regulator: regulator to free
 *
 * Deallocate a regulator allocated with devm_regulator_get(). Normally
 * this function will not need to be called and the resource management
 * code will ensure that the resource is freed.
 */
void devm_regulator_put(struct regulator *regulator)
{
	int rc;

	rc = devres_release(regulator->dev, devm_regulator_release,
			    devm_regulator_match, regulator);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_put);

/**
 * devm_regulator_bulk_get - managed get multiple regulator consumers
 *
 * @dev:           Device to supply
 * @num_consumers: Number of consumers to register
 * @consumers:     Configuration of consumers; clients are stored here.
 *
 * @return 0 on success, an errno on failure.
 *
 * This helper function allows drivers to get several regulator
 * consumers in one operation with management, the regulators will
 * automatically be freed when the device is unbound.  If any of the
 * regulators cannot be acquired then any regulators that were
 * allocated will be freed before returning to the caller.
 */
int devm_regulator_bulk_get(struct device *dev, int num_consumers,
			    struct regulator_bulk_data *consumers)
{
	int i;
	int ret;

	for (i = 0; i < num_consumers; i++)
		consumers[i].consumer = NULL;

	for (i = 0; i < num_consumers; i++) {
		consumers[i].consumer = devm_regulator_get(dev,
							   consumers[i].supply);
		if (IS_ERR(consumers[i].consumer)) {
			ret = PTR_ERR(consumers[i].consumer);
			dev_err(dev, "Failed to get supply '%s': %d\n",
				consumers[i].supply, ret);
			consumers[i].consumer = NULL;
			goto err;
		}
	}

	return 0;

err:
	for (i = 0; i < num_consumers && consumers[i].consumer; i++)
		devm_regulator_put(consumers[i].consumer);

	return ret;
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);

static void devm_rdev_release(struct device *dev, void *res)
{
	regulator_unregister(*(struct regulator_dev **)res);
}

/**
 * devm_regulator_register - Resource managed regulator_register()
 * @regulator_desc: regulator to register
 * @config: runtime configuration for regulator
 *
 * Called by regulator drivers to register a regulator.  Returns a
 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
 * error.  The regulator will automatically be released when the device
 * is unbound.
 */
struct regulator_dev *devm_regulator_register(struct device *dev,
				  const struct regulator_desc *regulator_desc,
				  const struct regulator_config *config)
{
	struct regulator_dev **ptr, *rdev;

	ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
			   GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	rdev = regulator_register(regulator_desc, config);
	if (!IS_ERR(rdev)) {
		*ptr = rdev;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return rdev;
}
EXPORT_SYMBOL_GPL(devm_regulator_register);

static int devm_rdev_match(struct device *dev, void *res, void *data)
{
	struct regulator_dev **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}

/**
 * devm_regulator_unregister - Resource managed regulator_unregister()
 * @regulator: regulator to free
 *
 * Unregister a regulator registered with devm_regulator_register().
 * Normally this function will not need to be called and the resource
 * management code will ensure that the resource is freed.
 */
void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev)
{
	int rc;

	rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister);

struct regulator_supply_alias_match {
	struct device *dev;
	const char *id;
};

static int devm_regulator_match_supply_alias(struct device *dev, void *res,
					     void *data)
{
	struct regulator_supply_alias_match *match = res;
	struct regulator_supply_alias_match *target = data;

	return match->dev == target->dev && strcmp(match->id, target->id) == 0;
}

static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
{
	struct regulator_supply_alias_match *match = res;

	regulator_unregister_supply_alias(match->dev, match->id);
}

/**
 * devm_regulator_register_supply_alias - Resource managed
 * regulator_register_supply_alias()
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: Supply name or regulator ID
 * @alias_dev: device that should be used to lookup the supply
 * @alias_id: Supply name or regulator ID that should be used to lookup the
 * supply
 *
 * The supply alias will automatically be unregistered when the source
 * device is unbound.
 */
int devm_regulator_register_supply_alias(struct device *dev, const char *id,
					 struct device *alias_dev,
					 const char *alias_id)
{
	struct regulator_supply_alias_match *match;
	int ret;

	match = devres_alloc(devm_regulator_destroy_supply_alias,
			   sizeof(struct regulator_supply_alias_match),
			   GFP_KERNEL);
	if (!match)
		return -ENOMEM;

	match->dev = dev;
	match->id = id;

	ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
	if (ret < 0) {
		devres_free(match);
		return ret;
	}

	devres_add(dev, match);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);

/**
 * devm_regulator_unregister_supply_alias - Resource managed
 * regulator_unregister_supply_alias()
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: Supply name or regulator ID
 *
 * Unregister an alias registered with
 * devm_regulator_register_supply_alias(). Normally this function
 * will not need to be called and the resource management code
 * will ensure that the resource is freed.
 */
void devm_regulator_unregister_supply_alias(struct device *dev, const char *id)
{
	struct regulator_supply_alias_match match;
	int rc;

	match.dev = dev;
	match.id = id;

	rc = devres_release(dev, devm_regulator_destroy_supply_alias,
			    devm_regulator_match_supply_alias, &match);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister_supply_alias);

/**
 * devm_regulator_bulk_register_supply_alias - Managed register
 * multiple aliases
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: List of supply names or regulator IDs
 * @alias_dev: device that should be used to lookup the supply
 * @alias_id: List of supply names or regulator IDs that should be used to
 * lookup the supply
 * @num_id: Number of aliases to register
 *
 * @return 0 on success, an errno on failure.
 *
 * This helper function allows drivers to register several supply
 * aliases in one operation, the aliases will be automatically
 * unregisters when the source device is unbound.  If any of the
 * aliases cannot be registered any aliases that were registered
 * will be removed before returning to the caller.
 */
int devm_regulator_bulk_register_supply_alias(struct device *dev,
					      const char *const *id,
					      struct device *alias_dev,
					      const char *const *alias_id,
					      int num_id)
{
	int i;
	int ret;

	for (i = 0; i < num_id; ++i) {
		ret = devm_regulator_register_supply_alias(dev, id[i],
							   alias_dev,
							   alias_id[i]);
		if (ret < 0)
			goto err;
	}

	return 0;

err:
	dev_err(dev,
		"Failed to create supply alias %s,%s -> %s,%s\n",
		id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));

	while (--i >= 0)
		devm_regulator_unregister_supply_alias(dev, id[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);

/**
 * devm_regulator_bulk_unregister_supply_alias - Managed unregister
 * multiple aliases
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: List of supply names or regulator IDs
 * @num_id: Number of aliases to unregister
 *
 * Unregister aliases registered with
 * devm_regulator_bulk_register_supply_alias(). Normally this function
 * will not need to be called and the resource management code
 * will ensure that the resource is freed.
 */
void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
						 const char *const *id,
						 int num_id)
{
	int i;

	for (i = 0; i < num_id; ++i)
		devm_regulator_unregister_supply_alias(dev, id[i]);
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);

struct regulator_notifier_match {
	struct regulator *regulator;
	struct notifier_block *nb;
};

static int devm_regulator_match_notifier(struct device *dev, void *res,
					 void *data)
{
	struct regulator_notifier_match *match = res;
	struct regulator_notifier_match *target = data;

	return match->regulator == target->regulator && match->nb == target->nb;
}

static void devm_regulator_destroy_notifier(struct device *dev, void *res)
{
	struct regulator_notifier_match *match = res;

	regulator_unregister_notifier(match->regulator, match->nb);
}

/**
 * devm_regulator_register_notifier - Resource managed
 * regulator_register_notifier
 *
 * @regulator: regulator source
 * @nb: notifier block
 *
 * The notifier will be registers under the consumer device and be
 * automatically be unregistered when the source device is unbound.
 */
int devm_regulator_register_notifier(struct regulator *regulator,
				     struct notifier_block *nb)
{
	struct regulator_notifier_match *match;
	int ret;

	match = devres_alloc(devm_regulator_destroy_notifier,
			     sizeof(struct regulator_notifier_match),
			     GFP_KERNEL);
	if (!match)
		return -ENOMEM;

	match->regulator = regulator;
	match->nb = nb;

	ret = regulator_register_notifier(regulator, nb);
	if (ret < 0) {
		devres_free(match);
		return ret;
	}

	devres_add(regulator->dev, match);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);

/**
 * devm_regulator_unregister_notifier - Resource managed
 * regulator_unregister_notifier()
 *
 * @regulator: regulator source
 * @nb: notifier block
 *
 * Unregister a notifier registered with devm_regulator_register_notifier().
 * Normally this function will not need to be called and the resource
 * management code will ensure that the resource is freed.
 */
void devm_regulator_unregister_notifier(struct regulator *regulator,
					struct notifier_block *nb)
{
	struct regulator_notifier_match match;
	int rc;

	match.regulator = regulator;
	match.nb = nb;

	rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
			    devm_regulator_match_notifier, &match);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);