2 * drivers/gpio/devres.c - managed gpio resources
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.
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
12 * This file is based on kernel/irq/devres.c
14 * Copyright (c) 2011 John Crispin <blogic@openwrt.org>
17 #include <linux/module.h>
18 #include <linux/gpio.h>
19 #include <linux/device.h>
20 #include <linux/gfp.h>
22 static void devm_gpiod_release(struct device
*dev
, void *res
)
24 struct gpio_desc
**desc
= res
;
29 static int devm_gpiod_match(struct device
*dev
, void *res
, void *data
)
31 struct gpio_desc
**this = res
, **gpio
= data
;
33 return *this == *gpio
;
37 * devm_gpiod_get - Resource-managed gpiod_get()
39 * @con_id: function within the GPIO consumer
41 * Managed gpiod_get(). GPIO descriptors returned from this function are
42 * automatically disposed on driver detach. See gpiod_get() for detailed
43 * information about behavior and return values.
45 struct gpio_desc
*__must_check
devm_gpiod_get(struct device
*dev
,
48 return devm_gpiod_get_index(dev
, con_id
, 0);
50 EXPORT_SYMBOL(devm_gpiod_get
);
53 * devm_gpiod_get_index - Resource-managed gpiod_get_index()
55 * @con_id: function within the GPIO consumer
56 * @idx: index of the GPIO to obtain in the consumer
58 * Managed gpiod_get_index(). GPIO descriptors returned from this function are
59 * automatically disposed on driver detach. See gpiod_get_index() for detailed
60 * information about behavior and return values.
62 struct gpio_desc
*__must_check
devm_gpiod_get_index(struct device
*dev
,
66 struct gpio_desc
**dr
;
67 struct gpio_desc
*desc
;
69 dr
= devres_alloc(devm_gpiod_release
, sizeof(struct gpiod_desc
*),
72 return ERR_PTR(-ENOMEM
);
74 desc
= gpiod_get_index(dev
, con_id
, idx
);
85 EXPORT_SYMBOL(devm_gpiod_get_index
);
88 * devm_gpiod_put - Resource-managed gpiod_put()
89 * @desc: GPIO descriptor to dispose of
91 * Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
92 * devm_gpiod_get_index(). Normally this function will not be called as the GPIO
93 * will be disposed of by the resource management code.
95 void devm_gpiod_put(struct device
*dev
, struct gpio_desc
*desc
)
97 WARN_ON(devres_release(dev
, devm_gpiod_release
, devm_gpiod_match
,
100 EXPORT_SYMBOL(devm_gpiod_put
);
105 static void devm_gpio_release(struct device
*dev
, void *res
)
107 unsigned *gpio
= res
;
112 static int devm_gpio_match(struct device
*dev
, void *res
, void *data
)
114 unsigned *this = res
, *gpio
= data
;
116 return *this == *gpio
;
120 * devm_gpio_request - request a GPIO for a managed device
121 * @dev: device to request the GPIO for
122 * @gpio: GPIO to allocate
123 * @label: the name of the requested GPIO
125 * Except for the extra @dev argument, this function takes the
126 * same arguments and performs the same function as
127 * gpio_request(). GPIOs requested with this function will be
128 * automatically freed on driver detach.
130 * If an GPIO allocated with this function needs to be freed
131 * separately, devm_gpio_free() must be used.
134 int devm_gpio_request(struct device
*dev
, unsigned gpio
, const char *label
)
139 dr
= devres_alloc(devm_gpio_release
, sizeof(unsigned), GFP_KERNEL
);
143 rc
= gpio_request(gpio
, label
);
154 EXPORT_SYMBOL(devm_gpio_request
);
157 * devm_gpio_request_one - request a single GPIO with initial setup
158 * @dev: device to request for
159 * @gpio: the GPIO number
160 * @flags: GPIO configuration as specified by GPIOF_*
161 * @label: a literal description string of this GPIO
163 int devm_gpio_request_one(struct device
*dev
, unsigned gpio
,
164 unsigned long flags
, const char *label
)
169 dr
= devres_alloc(devm_gpio_release
, sizeof(unsigned), GFP_KERNEL
);
173 rc
= gpio_request_one(gpio
, flags
, label
);
184 EXPORT_SYMBOL(devm_gpio_request_one
);
187 * devm_gpio_free - free a GPIO
188 * @dev: device to free GPIO for
189 * @gpio: GPIO to free
191 * Except for the extra @dev argument, this function takes the
192 * same arguments and performs the same function as gpio_free().
193 * This function instead of gpio_free() should be used to manually
194 * free GPIOs allocated with devm_gpio_request().
196 void devm_gpio_free(struct device
*dev
, unsigned int gpio
)
199 WARN_ON(devres_release(dev
, devm_gpio_release
, devm_gpio_match
,
202 EXPORT_SYMBOL(devm_gpio_free
);
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