[mirror_ubuntu-artful-kernel.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 <john@phrozen.org>
 */

#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>

#include "gpiolib.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_fwnode_get_index_gpiod_from_child - get a GPIO descriptor from a
 *					    device's child node
 * @dev:	GPIO consumer
 * @con_id:	function within the GPIO consumer
 * @index:	index of the GPIO to obtain in the consumer
 * @child:	firmware node (child of @dev)
 * @flags:	GPIO initialization flags
 *
 * GPIO descriptors returned from this function are automatically disposed on
 * driver detach.
 *
 * On successful request the GPIO pin is configured in accordance with
 * provided @flags.
 */
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
						const char *con_id, int index,
						struct fwnode_handle *child,
						enum gpiod_flags flags,
						const char *label)
{
	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(gpio_suffixes); i++) {
		if (con_id)
			snprintf(prop_name, sizeof(prop_name), "%s-%s",
					    con_id, gpio_suffixes[i]);
		else
			snprintf(prop_name, sizeof(prop_name), "%s",
					    gpio_suffixes[i]);

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

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

	return desc;
}
EXPORT_SYMBOL(devm_fwnode_get_index_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	*
baddc7ca	14	* Copyright (c) 2011 John Crispin <john@phrozen.org>
1a0703ed JC	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
200d0177 AS	24	#include "gpiolib.h"
200d0177 AS	25
bae48da2 AC	26	static void devm_gpiod_release(struct device dev, void res)
	27	{
	28	struct gpio_desc **desc = res;
	29
	30	gpiod_put(*desc);
	31	}
	32
	33	static int devm_gpiod_match(struct device dev, void res, void *data)
	34	{
	35	struct gpio_desc this = res, gpio = data;
	36
	37	return this == gpio;
	38	}
	39
331758ee RI	40	static void devm_gpiod_release_array(struct device dev, void res)
	41	{
	42	struct gpio_descs **descs = res;
	43
	44	gpiod_put_array(*descs);
	45	}
	46
	47	static int devm_gpiod_match_array(struct device dev, void res, void *data)
	48	{
	49	struct gpio_descs this = res, gpios = data;
	50
	51	return this == gpios;
	52	}
	53
bae48da2 AC	54	/**
	55	* devm_gpiod_get - Resource-managed gpiod_get()
	56	* @dev: GPIO consumer
	57	* @con_id: function within the GPIO consumer
39b2bbe3	58	* @flags: optional GPIO initialization flags
bae48da2 AC	59	*
	60	* Managed gpiod_get(). GPIO descriptors returned from this function are
	61	* automatically disposed on driver detach. See gpiod_get() for detailed
	62	* information about behavior and return values.
	63	*/
b17d1bf1	64	struct gpio_desc __must_check devm_gpiod_get(struct device dev,
39b2bbe3 AC	65	const char *con_id,
39b2bbe3 AC	66	enum gpiod_flags flags)
bae48da2	67	{
39b2bbe3	68	return devm_gpiod_get_index(dev, con_id, 0, flags);
bae48da2	69	}
b17d1bf1	70	EXPORT_SYMBOL(devm_gpiod_get);
bae48da2	71
29a1f233 TR	72	/**
	73	* devm_gpiod_get_optional - Resource-managed gpiod_get_optional()
	74	* @dev: GPIO consumer
	75	* @con_id: function within the GPIO consumer
39b2bbe3	76	* @flags: optional GPIO initialization flags
29a1f233 TR	77	*
	78	* Managed gpiod_get_optional(). GPIO descriptors returned from this function
	79	* are automatically disposed on driver detach. See gpiod_get_optional() for
	80	* detailed information about behavior and return values.
	81	*/
b17d1bf1	82	struct gpio_desc __must_check devm_gpiod_get_optional(struct device dev,
39b2bbe3 AC	83	const char *con_id,
39b2bbe3 AC	84	enum gpiod_flags flags)
29a1f233	85	{
39b2bbe3	86	return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
29a1f233	87	}
b17d1bf1	88	EXPORT_SYMBOL(devm_gpiod_get_optional);
29a1f233	89
bae48da2 AC	90	/**
	91	* devm_gpiod_get_index - Resource-managed gpiod_get_index()
	92	* @dev: GPIO consumer
	93	* @con_id: function within the GPIO consumer
	94	* @idx: index of the GPIO to obtain in the consumer
39b2bbe3	95	* @flags: optional GPIO initialization flags
bae48da2 AC	96	*
	97	* Managed gpiod_get_index(). GPIO descriptors returned from this function are
	98	* automatically disposed on driver detach. See gpiod_get_index() for detailed
	99	* information about behavior and return values.
	100	*/
b17d1bf1	101	struct gpio_desc __must_check devm_gpiod_get_index(struct device dev,
bae48da2	102	const char *con_id,
39b2bbe3 AC	103	unsigned int idx,
39b2bbe3 AC	104	enum gpiod_flags flags)
bae48da2 AC	105	{
	106	struct gpio_desc **dr;
	107	struct gpio_desc *desc;
	108
0f05a3ae	109	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
bae48da2 AC	110	GFP_KERNEL);
	111	if (!dr)
	112	return ERR_PTR(-ENOMEM);
	113
39b2bbe3	114	desc = gpiod_get_index(dev, con_id, idx, flags);
bae48da2 AC	115	if (IS_ERR(desc)) {
	116	devres_free(dr);
	117	return desc;
	118	}
	119
	120	*dr = desc;
	121	devres_add(dev, dr);
	122
5fcdb9dc	123	return desc;
bae48da2	124	}
b17d1bf1	125	EXPORT_SYMBOL(devm_gpiod_get_index);
bae48da2	126
40b73183	127	/**
537b94da BB	128	* devm_fwnode_get_index_gpiod_from_child - get a GPIO descriptor from a
537b94da BB	129	* device's child node
40b73183	130	* @dev: GPIO consumer
1feb57a2	131	* @con_id: function within the GPIO consumer
537b94da	132	* @index: index of the GPIO to obtain in the consumer
40b73183	133	* @child: firmware node (child of @dev)
a264d10f	134	* @flags: GPIO initialization flags
40b73183 MW	135	*
	136	* GPIO descriptors returned from this function are automatically disposed on
	137	* driver detach.
a264d10f	138	*
ff21378a	139	* On successful request the GPIO pin is configured in accordance with
a264d10f	140	* provided @flags.
40b73183	141	*/
537b94da BB	142	struct gpio_desc devm_fwnode_get_index_gpiod_from_child(struct device dev,
	143	const char *con_id, int index,
	144	struct fwnode_handle *child,
	145	enum gpiod_flags flags,
	146	const char *label)
40b73183	147	{
1feb57a2	148	char prop_name[32]; /* 32 is max size of property name */
40b73183 MW	149	struct gpio_desc **dr;
40b73183 MW	150	struct gpio_desc *desc;
1feb57a2	151	unsigned int i;
40b73183 MW	152
	153	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
	154	GFP_KERNEL);
	155	if (!dr)
	156	return ERR_PTR(-ENOMEM);
	157
200d0177	158	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1feb57a2 OS	159	if (con_id)
1feb57a2 OS	160	snprintf(prop_name, sizeof(prop_name), "%s-%s",
200d0177	161	con_id, gpio_suffixes[i]);
1feb57a2 OS	162	else
1feb57a2 OS	163	snprintf(prop_name, sizeof(prop_name), "%s",
200d0177	164	gpio_suffixes[i]);
1feb57a2	165
537b94da BB	166	desc = fwnode_get_named_gpiod(child, prop_name, index, flags,
537b94da BB	167	label);
40c8eaba	168	if (!IS_ERR(desc) \|\| (PTR_ERR(desc) != -ENOENT))
1feb57a2 OS	169	break;
1feb57a2 OS	170	}
40b73183 MW	171	if (IS_ERR(desc)) {
	172	devres_free(dr);
	173	return desc;
	174	}
	175
	176	*dr = desc;
	177	devres_add(dev, dr);
	178
	179	return desc;
	180	}
537b94da	181	EXPORT_SYMBOL(devm_fwnode_get_index_gpiod_from_child);
40b73183	182
29a1f233 TR	183	/**
	184	* devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
	185	* @dev: GPIO consumer
	186	* @con_id: function within the GPIO consumer
	187	* @index: index of the GPIO to obtain in the consumer
39b2bbe3	188	* @flags: optional GPIO initialization flags
29a1f233 TR	189	*
	190	* Managed gpiod_get_index_optional(). GPIO descriptors returned from this
	191	* function are automatically disposed on driver detach. See
	192	* gpiod_get_index_optional() for detailed information about behavior and
	193	* return values.
	194	*/
b17d1bf1	195	struct gpio_desc __must_check devm_gpiod_get_index_optional(struct device dev,
29a1f233	196	const char *con_id,
39b2bbe3	197	unsigned int index,
b17d1bf1	198	enum gpiod_flags flags)
29a1f233 TR	199	{
	200	struct gpio_desc *desc;
	201
39b2bbe3	202	desc = devm_gpiod_get_index(dev, con_id, index, flags);
29a1f233 TR	203	if (IS_ERR(desc)) {
	204	if (PTR_ERR(desc) == -ENOENT)
	205	return NULL;
	206	}
	207
	208	return desc;
	209	}
b17d1bf1	210	EXPORT_SYMBOL(devm_gpiod_get_index_optional);
29a1f233	211
331758ee RI	212	/**
	213	* devm_gpiod_get_array - Resource-managed gpiod_get_array()
	214	* @dev: GPIO consumer
	215	* @con_id: function within the GPIO consumer
	216	* @flags: optional GPIO initialization flags
	217	*
	218	* Managed gpiod_get_array(). GPIO descriptors returned from this function are
	219	* automatically disposed on driver detach. See gpiod_get_array() for detailed
	220	* information about behavior and return values.
	221	*/
	222	struct gpio_descs __must_check devm_gpiod_get_array(struct device dev,
	223	const char *con_id,
	224	enum gpiod_flags flags)
	225	{
	226	struct gpio_descs **dr;
	227	struct gpio_descs *descs;
	228
	229	dr = devres_alloc(devm_gpiod_release_array,
	230	sizeof(struct gpio_descs *), GFP_KERNEL);
	231	if (!dr)
	232	return ERR_PTR(-ENOMEM);
	233
	234	descs = gpiod_get_array(dev, con_id, flags);
	235	if (IS_ERR(descs)) {
	236	devres_free(dr);
	237	return descs;
	238	}
	239
	240	*dr = descs;
	241	devres_add(dev, dr);
	242
	243	return descs;
	244	}
	245	EXPORT_SYMBOL(devm_gpiod_get_array);
	246
	247	/**
	248	* devm_gpiod_get_array_optional - Resource-managed gpiod_get_array_optional()
	249	* @dev: GPIO consumer
	250	* @con_id: function within the GPIO consumer
	251	* @flags: optional GPIO initialization flags
	252	*
	253	* Managed gpiod_get_array_optional(). GPIO descriptors returned from this
	254	* function are automatically disposed on driver detach.
	255	* See gpiod_get_array_optional() for detailed information about behavior and
	256	* return values.
	257	*/
	258	struct gpio_descs *__must_check
	259	devm_gpiod_get_array_optional(struct device dev, const char con_id,
	260	enum gpiod_flags flags)
	261	{
	262	struct gpio_descs *descs;
	263
	264	descs = devm_gpiod_get_array(dev, con_id, flags);
	265	if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT))
	266	return NULL;
	267
	268	return descs;
	269	}
	270	EXPORT_SYMBOL(devm_gpiod_get_array_optional);
	271
bae48da2 AC	272	/**
	273	* devm_gpiod_put - Resource-managed gpiod_put()
	274	* @desc: GPIO descriptor to dispose of
	275	*
	276	* Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
	277	* devm_gpiod_get_index(). Normally this function will not be called as the GPIO
	278	* will be disposed of by the resource management code.
	279	*/
	280	void devm_gpiod_put(struct device dev, struct gpio_desc desc)
	281	{
	282	WARN_ON(devres_release(dev, devm_gpiod_release, devm_gpiod_match,
	283	&desc));
	284	}
	285	EXPORT_SYMBOL(devm_gpiod_put);
	286
331758ee RI	287	/**
	288	* devm_gpiod_put_array - Resource-managed gpiod_put_array()
	289	* @descs: GPIO descriptor array to dispose of
	290	*
	291	* Dispose of an array of GPIO descriptors obtained with devm_gpiod_get_array().
	292	* Normally this function will not be called as the GPIOs will be disposed of
	293	* by the resource management code.
	294	*/
	295	void devm_gpiod_put_array(struct device dev, struct gpio_descs descs)
	296	{
	297	WARN_ON(devres_release(dev, devm_gpiod_release_array,
	298	devm_gpiod_match_array, &descs));
	299	}
	300	EXPORT_SYMBOL(devm_gpiod_put_array);
	301
bae48da2 AC	302
	303
	304
1a0703ed JC	305	static void devm_gpio_release(struct device dev, void res)
	306	{
	307	unsigned *gpio = res;
	308
	309	gpio_free(*gpio);
	310	}
	311
	312	static int devm_gpio_match(struct device dev, void res, void *data)
	313	{
	314	unsigned this = res, gpio = data;
	315
	316	return this == gpio;
	317	}
	318
	319	/**
713b7ef8 WS	320	* devm_gpio_request - request a GPIO for a managed device
	321	* @dev: device to request the GPIO for
	322	* @gpio: GPIO to allocate
	323	* @label: the name of the requested GPIO
1a0703ed JC	324	*
	325	* Except for the extra @dev argument, this function takes the
	326	* same arguments and performs the same function as
	327	* gpio_request(). GPIOs requested with this function will be
	328	* automatically freed on driver detach.
	329	*
	330	* If an GPIO allocated with this function needs to be freed
	331	* separately, devm_gpio_free() must be used.
	332	*/
	333
	334	int devm_gpio_request(struct device dev, unsigned gpio, const char label)
	335	{
	336	unsigned *dr;
	337	int rc;
	338
	339	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	340	if (!dr)
	341	return -ENOMEM;
	342
	343	rc = gpio_request(gpio, label);
	344	if (rc) {
	345	devres_free(dr);
	346	return rc;
	347	}
	348
	349	*dr = gpio;
	350	devres_add(dev, dr);
	351
	352	return 0;
	353	}
	354	EXPORT_SYMBOL(devm_gpio_request);
	355
09d71ff1 MB	356	/**
	357	* devm_gpio_request_one - request a single GPIO with initial setup
	358	* @dev: device to request for
	359	* @gpio: the GPIO number
	360	* @flags: GPIO configuration as specified by GPIOF_*
	361	* @label: a literal description string of this GPIO
	362	*/
	363	int devm_gpio_request_one(struct device *dev, unsigned gpio,
	364	unsigned long flags, const char *label)
	365	{
	366	unsigned *dr;
	367	int rc;
	368
	369	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
	370	if (!dr)
	371	return -ENOMEM;
	372
	373	rc = gpio_request_one(gpio, flags, label);
	374	if (rc) {
	375	devres_free(dr);
	376	return rc;
	377	}
	378
	379	*dr = gpio;
	380	devres_add(dev, dr);
	381
	382	return 0;
	383	}
3996bfc7	384	EXPORT_SYMBOL(devm_gpio_request_one);
09d71ff1	385
1a0703ed	386	/**
713b7ef8 WS	387	* devm_gpio_free - free a GPIO
	388	* @dev: device to free GPIO for
	389	* @gpio: GPIO to free
1a0703ed JC	390	*
	391	* Except for the extra @dev argument, this function takes the
	392	* same arguments and performs the same function as gpio_free().
	393	* This function instead of gpio_free() should be used to manually
	394	* free GPIOs allocated with devm_gpio_request().
	395	*/
	396	void devm_gpio_free(struct device *dev, unsigned int gpio)
	397	{
	398
a85990b3	399	WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
1a0703ed	400	&gpio));
1a0703ed JC	401	}
1a0703ed JC	402	EXPORT_SYMBOL(devm_gpio_free);