[linux.git] / drivers / gpio / devres.c

/*
 * drivers/gpio/devres.c - managed gpio resources
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This file is based on kernel/irq/devres.c
 *
 * Copyright (c) 2011 John Crispin <[email protected]>
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/device.h>
#include <linux/gfp.h>

static void devm_gpiod_release(struct device *dev, void *res)
{
	struct gpio_desc **desc = res;

	gpiod_put(*desc);
}

static int devm_gpiod_match(struct device *dev, void *res, void *data)
{
	struct gpio_desc **this = res, **gpio = data;

	return *this == *gpio;
}

static void devm_gpiod_release_array(struct device *dev, void *res)
{
	struct gpio_descs **descs = res;

	gpiod_put_array(*descs);
}

static int devm_gpiod_match_array(struct device *dev, void *res, void *data)
{
	struct gpio_descs **this = res, **gpios = data;

	return *this == *gpios;
}

/**
 * devm_gpiod_get - Resource-managed gpiod_get()
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @flags:	optional GPIO initialization flags
 *
 * Managed gpiod_get(). GPIO descriptors returned from this function are
 * automatically disposed on driver detach. See gpiod_get() for detailed
 * information about behavior and return values.
 */
struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev,
					      const char *con_id,
					      enum gpiod_flags flags)
{
	return devm_gpiod_get_index(dev, con_id, 0, flags);
}
EXPORT_SYMBOL(__devm_gpiod_get);

/**
 * devm_gpiod_get_optional - Resource-managed gpiod_get_optional()
 * @dev: GPIO consumer
 * @con_id: function within the GPIO consumer
 * @flags: optional GPIO initialization flags
 *
 * Managed gpiod_get_optional(). GPIO descriptors returned from this function
 * are automatically disposed on driver detach. See gpiod_get_optional() for
 * detailed information about behavior and return values.
 */
struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev,
						       const char *con_id,
						       enum gpiod_flags flags)
{
	return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
}
EXPORT_SYMBOL(__devm_gpiod_get_optional);

/**
 * devm_gpiod_get_index - Resource-managed gpiod_get_index()
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @idx:	index of the GPIO to obtain in the consumer
 * @flags:	optional GPIO initialization flags
 *
 * Managed gpiod_get_index(). GPIO descriptors returned from this function are
 * automatically disposed on driver detach. See gpiod_get_index() for detailed
 * information about behavior and return values.
 */
struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev,
						    const char *con_id,
						    unsigned int idx,
						    enum gpiod_flags flags)
{
	struct gpio_desc **dr;
	struct gpio_desc *desc;

	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
			  GFP_KERNEL);
	if (!dr)
		return ERR_PTR(-ENOMEM);

	desc = gpiod_get_index(dev, con_id, idx, flags);
	if (IS_ERR(desc)) {
		devres_free(dr);
		return desc;
	}

	*dr = desc;
	devres_add(dev, dr);

	return desc;
}
EXPORT_SYMBOL(__devm_gpiod_get_index);

/**
 * devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @child:	firmware node (child of @dev)
 *
 * GPIO descriptors returned from this function are automatically disposed on
 * driver detach.
 */
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
					    const char *con_id,
					    struct fwnode_handle *child)
{
	static const char * const suffixes[] = { "gpios", "gpio" };
	char prop_name[32]; /* 32 is max size of property name */
	struct gpio_desc **dr;
	struct gpio_desc *desc;
	unsigned int i;

	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
			  GFP_KERNEL);
	if (!dr)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < ARRAY_SIZE(suffixes); i++) {
		if (con_id)
			snprintf(prop_name, sizeof(prop_name), "%s-%s",
					    con_id, suffixes[i]);
		else
			snprintf(prop_name, sizeof(prop_name), "%s",
							       suffixes[i]);

		desc = fwnode_get_named_gpiod(child, prop_name);
		if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
			break;
	}
	if (IS_ERR(desc)) {
		devres_free(dr);
		return desc;
	}

	*dr = desc;
	devres_add(dev, dr);

	return desc;
}
EXPORT_SYMBOL(devm_get_gpiod_from_child);

/**
 * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
 * @dev: GPIO consumer
 * @con_id: function within the GPIO consumer
 * @index: index of the GPIO to obtain in the consumer
 * @flags: optional GPIO initialization flags
 *
 * Managed gpiod_get_index_optional(). GPIO descriptors returned from this
 * function are automatically disposed on driver detach. See
 * gpiod_get_index_optional() for detailed information about behavior and
 * return values.
 */
struct gpio_desc *__must_check __devm_gpiod_get_index_optional(struct device *dev,
							     const char *con_id,
							     unsigned int index,
							 enum gpiod_flags flags)
{
	struct gpio_desc *desc;

	desc = devm_gpiod_get_index(dev, con_id, index, flags);
	if (IS_ERR(desc)) {
		if (PTR_ERR(desc) == -ENOENT)
			return NULL;
	}

	return desc;
}
EXPORT_SYMBOL(__devm_gpiod_get_index_optional);

/**
 * devm_gpiod_get_array - Resource-managed gpiod_get_array()
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @flags:	optional GPIO initialization flags
 *
 * Managed gpiod_get_array(). GPIO descriptors returned from this function are
 * automatically disposed on driver detach. See gpiod_get_array() for detailed
 * information about behavior and return values.
 */
struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
						     const char *con_id,
						     enum gpiod_flags flags)
{
	struct gpio_descs **dr;
	struct gpio_descs *descs;

	dr = devres_alloc(devm_gpiod_release_array,
			  sizeof(struct gpio_descs *), GFP_KERNEL);
	if (!dr)
		return ERR_PTR(-ENOMEM);

	descs = gpiod_get_array(dev, con_id, flags);
	if (IS_ERR(descs)) {
		devres_free(dr);
		return descs;
	}

	*dr = descs;
	devres_add(dev, dr);

	return descs;
}
EXPORT_SYMBOL(devm_gpiod_get_array);

/**
 * devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional()
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @flags:	optional GPIO initialization flags
 *
 * Managed gpiod_get_array_optional(). GPIO descriptors returned from this
 * function are automatically disposed on driver detach.
 * See gpiod_get_array_optional() for detailed information about behavior and
 * return values.
 */
struct gpio_descs *__must_check
devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
			      enum gpiod_flags flags)
{
	struct gpio_descs *descs;

	descs = devm_gpiod_get_array(dev, con_id, flags);
	if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
		return NULL;

	return descs;
}
EXPORT_SYMBOL(devm_gpiod_get_array_optional);

/**
 * devm_gpiod_put - Resource-managed gpiod_put()
 * @desc:	GPIO descriptor to dispose of
 *
 * Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
 * devm_gpiod_get_index(). Normally this function will not be called as the GPIO
 * will be disposed of by the resource management code.
 */
void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
{
	WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
		&desc));
}
EXPORT_SYMBOL(devm_gpiod_put);

/**
 * devm_gpiod_put_array - Resource-managed gpiod_put_array()
 * @descs:	GPIO descriptor array to dispose of
 *
 * Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array().
 * Normally this function will not be called as the GPIOs will be disposed of
 * by the resource management code.
 */
void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs)
{
	WARN_ON(devres_release(dev, devm_gpiod_release_array,
			       devm_gpiod_match_array, &descs));
}
EXPORT_SYMBOL(devm_gpiod_put_array);


static void devm_gpio_release(struct device *dev, void *res)
{
	unsigned *gpio = res;

	gpio_free(*gpio);
}

static int devm_gpio_match(struct device *dev, void *res, void *data)
{
	unsigned *this = res, *gpio = data;

	return *this == *gpio;
}

/**
 *      devm_gpio_request - request a GPIO for a managed device
 *      @dev: device to request the GPIO for
 *      @gpio: GPIO to allocate
 *      @label: the name of the requested GPIO
 *
 *      Except for the extra @dev argument, this function takes the
 *      same arguments and performs the same function as
 *      gpio_request().  GPIOs requested with this function will be
 *      automatically freed on driver detach.
 *
 *      If an GPIO allocated with this function needs to be freed
 *      separately, devm_gpio_free() must be used.
 */

int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
{
	unsigned *dr;
	int rc;

	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	rc = gpio_request(gpio, label);
	if (rc) {
		devres_free(dr);
		return rc;
	}

	*dr = gpio;
	devres_add(dev, dr);

	return 0;
}
EXPORT_SYMBOL(devm_gpio_request);

/**
 *	devm_gpio_request_one - request a single GPIO with initial setup
 *	@dev:   device to request for
 *	@gpio:	the GPIO number
 *	@flags:	GPIO configuration as specified by GPIOF_*
 *	@label:	a literal description string of this GPIO
 */
int devm_gpio_request_one(struct device *dev, unsigned gpio,
			  unsigned long flags, const char *label)
{
	unsigned *dr;
	int rc;

	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	rc = gpio_request_one(gpio, flags, label);
	if (rc) {
		devres_free(dr);
		return rc;
	}

	*dr = gpio;
	devres_add(dev, dr);

	return 0;
}
EXPORT_SYMBOL(devm_gpio_request_one);

/**
 *      devm_gpio_free - free a GPIO
 *      @dev: device to free GPIO for
 *      @gpio: GPIO to free
 *
 *      Except for the extra @dev argument, this function takes the
 *      same arguments and performs the same function as gpio_free().
 *      This function instead of gpio_free() should be used to manually
 *      free GPIOs allocated with devm_gpio_request().
 */
void devm_gpio_free(struct device *dev, unsigned int gpio)
{

	WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
		&gpio));
}
EXPORT_SYMBOL(devm_gpio_free);
Commit	Line	Data
1a0703ed JC	1	/*
	2	* drivers/gpio/devres.c - managed gpio resources
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2
	6	* as published by the Free Software Foundation.
	7	*
	8	* You should have received a copy of the GNU General Public License
	9	* along with this program; if not, write to the Free Software
	10	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	11	*
	12	* This file is based on kernel/irq/devres.c
	13	*
	14	* Copyright (c) 2011 John Crispin <[email protected]>
	15	*/
	16
	17	#include <linux/module.h>
3c2c628f	18	#include <linux/err.h>
1a0703ed	19	#include <linux/gpio.h>
3c2c628f	20	#include <linux/gpio/consumer.h>
1a0703ed JC	21	#include <linux/device.h>
	22	#include <linux/gfp.h>
	23
bae48da2 AC	24	static void devm_gpiod_release(struct device dev, void res)
	25	{
	26	struct gpio_desc **desc = res;
	27
	28	gpiod_put(*desc);
	29	}
	30
	31	static int devm_gpiod_match(struct device dev, void res, void *data)
	32	{
	33	struct gpio_desc this = res, gpio = data;
	34
	35	return this == gpio;
	36	}
	37
331758ee RI	38	static void devm_gpiod_release_array(struct device dev, void res)
	39	{
	40	struct gpio_descs **descs = res;
	41
	42	gpiod_put_array(*descs);
	43	}
	44
	45	static int devm_gpiod_match_array(struct device dev, void res, void *data)
	46	{
	47	struct gpio_descs this = res, gpios = data;
	48
	49	return this == gpios;
	50	}
	51
bae48da2 AC	52	/**
	53	* devm_gpiod_get - Resource-managed gpiod_get()
	54	* @dev: GPIO consumer
	55	* @con_id: function within the GPIO consumer
39b2bbe3	56	* @flags: optional GPIO initialization flags
bae48da2 AC	57	*
	58	* Managed gpiod_get(). GPIO descriptors returned from this function are
	59	* automatically disposed on driver detach. See gpiod_get() for detailed
	60	* information about behavior and return values.
	61	*/
39b2bbe3 AC	62	struct gpio_desc __must_check __devm_gpiod_get(struct device dev,
	63	const char *con_id,
	64	enum gpiod_flags flags)
bae48da2	65	{
39b2bbe3	66	return devm_gpiod_get_index(dev, con_id, 0, flags);
bae48da2	67	}
39b2bbe3	68	EXPORT_SYMBOL(__devm_gpiod_get);
bae48da2	69
29a1f233 TR	70	/**
	71	* devm_gpiod_get_optional - Resource-managed gpiod_get_optional()
	72	* @dev: GPIO consumer
	73	* @con_id: function within the GPIO consumer
39b2bbe3	74	* @flags: optional GPIO initialization flags
29a1f233 TR	75	*
	76	* Managed gpiod_get_optional(). GPIO descriptors returned from this function
	77	* are automatically disposed on driver detach. See gpiod_get_optional() for
	78	* detailed information about behavior and return values.
	79	*/
39b2bbe3 AC	80	struct gpio_desc __must_check __devm_gpiod_get_optional(struct device dev,
	81	const char *con_id,
	82	enum gpiod_flags flags)
29a1f233	83	{
39b2bbe3	84	return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
29a1f233	85	}
39b2bbe3	86	EXPORT_SYMBOL(__devm_gpiod_get_optional);
29a1f233	87
bae48da2 AC	88	/**
	89	* devm_gpiod_get_index - Resource-managed gpiod_get_index()
	90	* @dev: GPIO consumer
	91	* @con_id: function within the GPIO consumer
	92	* @idx: index of the GPIO to obtain in the consumer
39b2bbe3	93	* @flags: optional GPIO initialization flags
bae48da2 AC	94	*
	95	* Managed gpiod_get_index(). GPIO descriptors returned from this function are
	96	* automatically disposed on driver detach. See gpiod_get_index() for detailed
	97	* information about behavior and return values.
	98	*/
39b2bbe3	99	struct gpio_desc __must_check __devm_gpiod_get_index(struct device dev,
bae48da2	100	const char *con_id,
39b2bbe3 AC	101	unsigned int idx,
39b2bbe3 AC	102	enum gpiod_flags flags)
bae48da2 AC	103	{
	104	struct gpio_desc **dr;
	105	struct gpio_desc *desc;
	106
0f05a3ae	107	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
bae48da2 AC	108	GFP_KERNEL);
	109	if (!dr)
	110	return ERR_PTR(-ENOMEM);
	111
39b2bbe3	112	desc = gpiod_get_index(dev, con_id, idx, flags);
bae48da2 AC	113	if (IS_ERR(desc)) {
	114	devres_free(dr);
	115	return desc;
	116	}
	117
	118	*dr = desc;
	119	devres_add(dev, dr);
	120
5fcdb9dc	121	return desc;
bae48da2	122	}
39b2bbe3	123	EXPORT_SYMBOL(__devm_gpiod_get_index);
bae48da2	124
40b73183 MW	125	/**
	126	* devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node
	127	* @dev: GPIO consumer
1feb57a2	128	* @con_id: function within the GPIO consumer
40b73183 MW	129	* @child: firmware node (child of @dev)
	130	*
	131	* GPIO descriptors returned from this function are automatically disposed on
	132	* driver detach.
	133	*/
	134	struct gpio_desc devm_get_gpiod_from_child(struct device dev,
1feb57a2	135	const char *con_id,
40b73183 MW	136	struct fwnode_handle *child)
40b73183 MW	137	{
b6202855	138	static const char * const suffixes[] = { "gpios", "gpio" };
1feb57a2	139	char prop_name[32]; /* 32 is max size of property name */
40b73183 MW	140	struct gpio_desc **dr;
40b73183 MW	141	struct gpio_desc *desc;
1feb57a2	142	unsigned int i;
40b73183 MW	143
	144	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
	145	GFP_KERNEL);
	146	if (!dr)
	147	return ERR_PTR(-ENOMEM);
	148
1feb57a2 OS	149	for (i = 0; i < ARRAY_SIZE(suffixes); i++) {
	150	if (con_id)
	151	snprintf(prop_name, sizeof(prop_name), "%s-%s",
	152	con_id, suffixes[i]);
	153	else
	154	snprintf(prop_name, sizeof(prop_name), "%s",
	155	suffixes[i]);
	156
	157	desc = fwnode_get_named_gpiod(child, prop_name);
	158	if (!IS_ERR(desc) \|\| (PTR_ERR(desc) == -EPROBE_DEFER))
	159	break;
	160	}
40b73183 MW	161	if (IS_ERR(desc)) {
	162	devres_free(dr);
	163	return desc;
	164	}
	165
	166	*dr = desc;
	167	devres_add(dev, dr);
	168
	169	return desc;
	170	}
	171	EXPORT_SYMBOL(devm_get_gpiod_from_child);
	172
29a1f233 TR	173	/**
	174	* devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
	175	* @dev: GPIO consumer
	176	* @con_id: function within the GPIO consumer
	177	* @index: index of the GPIO to obtain in the consumer
39b2bbe3	178	* @flags: optional GPIO initialization flags
29a1f233 TR	179	*
	180	* Managed gpiod_get_index_optional(). GPIO descriptors returned from this
	181	* function are automatically disposed on driver detach. See
	182	* gpiod_get_index_optional() for detailed information about behavior and
	183	* return values.
	184	*/
39b2bbe3	185	struct gpio_desc __must_check __devm_gpiod_get_index_optional(struct device dev,
29a1f233	186	const char *con_id,
39b2bbe3 AC	187	unsigned int index,
39b2bbe3 AC	188	enum gpiod_flags flags)
29a1f233 TR	189	{
	190	struct gpio_desc *desc;
	191
39b2bbe3	192	desc = devm_gpiod_get_index(dev, con_id, index, flags);
29a1f233 TR	193	if (IS_ERR(desc)) {
	194	if (PTR_ERR(desc) == -ENOENT)
	195	return NULL;
	196	}
	197
	198	return desc;
	199	}
39b2bbe3	200	EXPORT_SYMBOL(__devm_gpiod_get_index_optional);
29a1f233	201
331758ee RI	202	/**
	203	* devm_gpiod_get_array - Resource-managed gpiod_get_array()
	204	* @dev: GPIO consumer
	205	* @con_id: function within the GPIO consumer
	206	* @flags: optional GPIO initialization flags
	207	*
	208	* Managed gpiod_get_array(). GPIO descriptors returned from this function are
	209	* automatically disposed on driver detach. See gpiod_get_array() for detailed
	210	* information about behavior and return values.
	211	*/
	212	struct gpio_descs __must_check devm_gpiod_get_array(struct device dev,
	213	const char *con_id,
	214	enum gpiod_flags flags)
	215	{
	216	struct gpio_descs **dr;
	217	struct gpio_descs *descs;
	218
	219	dr = devres_alloc(devm_gpiod_release_array,
	220	sizeof(struct gpio_descs *), GFP_KERNEL);
	221	if (!dr)
	222	return ERR_PTR(-ENOMEM);
	223
	224	descs = gpiod_get_array(dev, con_id, flags);
	225	if (IS_ERR(descs)) {
	226	devres_free(dr);
	227	return descs;
	228	}
	229
	230	*dr = descs;
	231	devres_add(dev, dr);
	232
	233	return descs;
	234	}
	235	EXPORT_SYMBOL(devm_gpiod_get_array);
	236
	237	/**
	238	* devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional()
	239	* @dev: GPIO consumer
	240	* @con_id: function within the GPIO consumer
	241	* @flags: optional GPIO initialization flags
	242	*
	243	* Managed gpiod_get_array_optional(). GPIO descriptors returned from this
	244	* function are automatically disposed on driver detach.
	245	* See gpiod_get_array_optional() for detailed information about behavior and
	246	* return values.
	247	*/
	248	struct gpio_descs *__must_check
	249	devm_gpiod_get_array_optional(struct device dev, const char con_id,
	250	enum gpiod_flags flags)
	251	{
	252	struct gpio_descs *descs;
	253
	254	descs = devm_gpiod_get_array(dev, con_id, flags);
	255	if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
	256	return NULL;
	257
	258	return descs;
	259	}
	260	EXPORT_SYMBOL(devm_gpiod_get_array_optional);
	261
bae48da2 AC	262	/**
	263	* devm_gpiod_put - Resource-managed gpiod_put()
	264	* @desc: GPIO descriptor to dispose of
	265	*
	266	* Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
	267	* devm_gpiod_get_index(). Normally this function will not be called as the GPIO
	268	* will be disposed of by the resource management code.
	269	*/
	270	void devm_gpiod_put(struct device dev, struct gpio_desc desc)
	271	{
	272	WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
	273	&desc));
	274	}
	275	EXPORT_SYMBOL(devm_gpiod_put);
	276
331758ee RI	277	/**
	278	* devm_gpiod_put_array - Resource-managed gpiod_put_array()
	279	* @descs: GPIO descriptor array to dispose of
	280	*
	281	* Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array().
	282	* Normally this function will not be called as the GPIOs will be disposed of
	283	* by the resource management code.
	284	*/
	285	void devm_gpiod_put_array(struct device dev, struct gpio_descs descs)
	286	{
	287	WARN_ON(devres_release(dev, devm_gpiod_release_array,
	288	devm_gpiod_match_array, &descs));
	289	}
	290	EXPORT_SYMBOL(devm_gpiod_put_array);
	291
bae48da2 AC	292
	293
	294
1a0703ed JC	295	static void devm_gpio_release(struct device dev, void res)
	296	{
	297	unsigned *gpio = res;
	298
	299	gpio_free(*gpio);
	300	}
	301
	302	static int devm_gpio_match(struct device dev, void res, void *data)
	303	{
	304	unsigned this = res, gpio = data;
	305
	306	return this == gpio;
	307	}
	308
	309	/**
713b7ef8 WS	310	* devm_gpio_request - request a GPIO for a managed device
	311	* @dev: device to request the GPIO for
	312	* @gpio: GPIO to allocate
	313	* @label: the name of the requested GPIO
1a0703ed JC	314	*
	315	* Except for the extra @dev argument, this function takes the
	316	* same arguments and performs the same function as
	317	* gpio_request(). GPIOs requested with this function will be
	318	* automatically freed on driver detach.
	319	*
	320	* If an GPIO allocated with this function needs to be freed
	321	* separately, devm_gpio_free() must be used.
	322	*/
	323
	324	int devm_gpio_request(struct device dev, unsigned gpio, const char label)
	325	{
	326	unsigned *dr;
	327	int rc;
	328
	329	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	330	if (!dr)
	331	return -ENOMEM;
	332
	333	rc = gpio_request(gpio, label);
	334	if (rc) {
	335	devres_free(dr);
	336	return rc;
	337	}
	338
	339	*dr = gpio;
	340	devres_add(dev, dr);
	341
	342	return 0;
	343	}
	344	EXPORT_SYMBOL(devm_gpio_request);
	345
09d71ff1 MB	346	/**
	347	* devm_gpio_request_one - request a single GPIO with initial setup
	348	* @dev: device to request for
	349	* @gpio: the GPIO number
	350	* @flags: GPIO configuration as specified by GPIOF_*
	351	* @label: a literal description string of this GPIO
	352	*/
	353	int devm_gpio_request_one(struct device *dev, unsigned gpio,
	354	unsigned long flags, const char *label)
	355	{
	356	unsigned *dr;
	357	int rc;
	358
	359	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	360	if (!dr)
	361	return -ENOMEM;
	362
	363	rc = gpio_request_one(gpio, flags, label);
	364	if (rc) {
	365	devres_free(dr);
	366	return rc;
	367	}
	368
	369	*dr = gpio;
	370	devres_add(dev, dr);
	371
	372	return 0;
	373	}
3996bfc7	374	EXPORT_SYMBOL(devm_gpio_request_one);
09d71ff1	375
1a0703ed	376	/**
713b7ef8 WS	377	* devm_gpio_free - free a GPIO
	378	* @dev: device to free GPIO for
	379	* @gpio: GPIO to free
1a0703ed JC	380	*
	381	* Except for the extra @dev argument, this function takes the
	382	* same arguments and performs the same function as gpio_free().
	383	* This function instead of gpio_free() should be used to manually
	384	* free GPIOs allocated with devm_gpio_request().
	385	*/
	386	void devm_gpio_free(struct device *dev, unsigned int gpio)
	387	{
	388
a85990b3	389	WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
1a0703ed	390	&gpio));
1a0703ed JC	391	}
1a0703ed JC	392	EXPORT_SYMBOL(devm_gpio_free);