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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/gpio.h
4 #include <linux/errno.h>
6 /* see Documentation/gpio.txt */
8 /* make these flag values available regardless of GPIO kconfig options */
9 #define GPIOF_DIR_OUT (0 << 0)
10 #define GPIOF_DIR_IN (1 << 0)
12 #define GPIOF_INIT_LOW (0 << 1)
13 #define GPIOF_INIT_HIGH (1 << 1)
15 #define GPIOF_IN (GPIOF_DIR_IN)
16 #define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
17 #define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
19 /* Gpio pin is open drain */
20 #define GPIOF_OPEN_DRAIN (1 << 2)
22 /* Gpio pin is open source */
23 #define GPIOF_OPEN_SOURCE (1 << 3)
25 #define GPIOF_EXPORT (1 << 4)
26 #define GPIOF_EXPORT_CHANGEABLE (1 << 5)
27 #define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
28 #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
31 * struct gpio - a structure describing a GPIO with configuration
32 * @gpio: the GPIO number
33 * @flags: GPIO configuration as specified by GPIOF_*
34 * @label: a literal description string of this GPIO
42 #ifdef CONFIG_GENERIC_GPIO
44 #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
48 #include <asm-generic/gpio.h>
50 static inline int gpio_get_value(unsigned int gpio
)
52 return __gpio_get_value(gpio
);
55 static inline void gpio_set_value(unsigned int gpio
, int value
)
57 __gpio_set_value(gpio
, value
);
60 static inline int gpio_cansleep(unsigned int gpio
)
62 return __gpio_cansleep(gpio
);
65 static inline int gpio_to_irq(unsigned int gpio
)
67 return __gpio_to_irq(gpio
);
70 static inline int irq_to_gpio(unsigned int irq
)
75 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
77 #else /* ! CONFIG_GENERIC_GPIO */
79 #include <linux/kernel.h>
80 #include <linux/types.h>
81 #include <linux/errno.h>
82 #include <linux/bug.h>
87 static inline bool gpio_is_valid(int number
)
92 static inline int gpio_request(unsigned gpio
, const char *label
)
97 static inline int gpio_request_one(unsigned gpio
,
98 unsigned long flags
, const char *label
)
103 static inline int gpio_request_array(const struct gpio
*array
, size_t num
)
108 static inline void gpio_free(unsigned gpio
)
112 /* GPIO can never have been requested */
116 static inline void gpio_free_array(const struct gpio
*array
, size_t num
)
120 /* GPIO can never have been requested */
124 static inline int gpio_direction_input(unsigned gpio
)
129 static inline int gpio_direction_output(unsigned gpio
, int value
)
134 static inline int gpio_set_debounce(unsigned gpio
, unsigned debounce
)
139 static inline int gpio_get_value(unsigned gpio
)
141 /* GPIO can never have been requested or set as {in,out}put */
146 static inline void gpio_set_value(unsigned gpio
, int value
)
148 /* GPIO can never have been requested or set as output */
152 static inline int gpio_cansleep(unsigned gpio
)
154 /* GPIO can never have been requested or set as {in,out}put */
159 static inline int gpio_get_value_cansleep(unsigned gpio
)
161 /* GPIO can never have been requested or set as {in,out}put */
166 static inline void gpio_set_value_cansleep(unsigned gpio
, int value
)
168 /* GPIO can never have been requested or set as output */
172 static inline int gpio_export(unsigned gpio
, bool direction_may_change
)
174 /* GPIO can never have been requested or set as {in,out}put */
179 static inline int gpio_export_link(struct device
*dev
, const char *name
,
182 /* GPIO can never have been exported */
187 static inline int gpio_sysfs_set_active_low(unsigned gpio
, int value
)
189 /* GPIO can never have been requested */
194 static inline void gpio_unexport(unsigned gpio
)
196 /* GPIO can never have been exported */
200 static inline int gpio_to_irq(unsigned gpio
)
202 /* GPIO can never have been requested or set as input */
207 static inline int irq_to_gpio(unsigned irq
)
209 /* irq can never have been returned from gpio_to_irq() */
215 gpiochip_add_pin_range(struct gpio_chip
*chip
, const char *pinctl_name
,
216 unsigned int gpio_offset
, unsigned int pin_offset
,
224 gpiochip_remove_pin_ranges(struct gpio_chip
*chip
)
229 #endif /* ! CONFIG_GENERIC_GPIO */
233 /* bindings for managed devices that want to request gpios */
234 int devm_gpio_request(struct device
*dev
, unsigned gpio
, const char *label
);
235 int devm_gpio_request_one(struct device
*dev
, unsigned gpio
,
236 unsigned long flags
, const char *label
);
237 void devm_gpio_free(struct device
*dev
, unsigned int gpio
);
239 #endif /* __LINUX_GPIO_H */