[deliverable/linux.git] / include / linux / gpio.h

#ifndef __LINUX_GPIO_H
#define __LINUX_GPIO_H

/* see Documentation/gpio.txt */

/* make these flag values available regardless of GPIO kconfig options */
#define GPIOF_DIR_OUT	(0 << 0)
#define GPIOF_DIR_IN	(1 << 0)

#define GPIOF_INIT_LOW	(0 << 1)
#define GPIOF_INIT_HIGH	(1 << 1)

#define GPIOF_IN		(GPIOF_DIR_IN)
#define GPIOF_OUT_INIT_LOW	(GPIOF_DIR_OUT | GPIOF_INIT_LOW)
#define GPIOF_OUT_INIT_HIGH	(GPIOF_DIR_OUT | GPIOF_INIT_HIGH)

#ifdef CONFIG_GENERIC_GPIO
#include <asm/gpio.h>

#else

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>

struct device;
struct gpio;
struct gpio_chip;

/*
 * Some platforms don't support the GPIO programming interface.
 *
 * In case some driver uses it anyway (it should normally have
 * depended on GENERIC_GPIO), these routines help the compiler
 * optimize out much GPIO-related code ... or trigger a runtime
 * warning when something is wrongly called.
 */

static inline bool gpio_is_valid(int number)
{
	return false;
}

static inline int gpio_request(unsigned gpio, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_one(unsigned gpio,
					unsigned long flags, const char *label)
{
	return -ENOSYS;
}

static inline int gpio_request_array(const struct gpio *array, size_t num)
{
	return -ENOSYS;
}

static inline void gpio_free(unsigned gpio)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline void gpio_free_array(const struct gpio *array, size_t num)
{
	might_sleep();

	/* GPIO can never have been requested */
	WARN_ON(1);
}

static inline int gpio_direction_input(unsigned gpio)
{
	return -ENOSYS;
}

static inline int gpio_direction_output(unsigned gpio, int value)
{
	return -ENOSYS;
}

static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
{
	return -ENOSYS;
}

static inline int gpio_get_value(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline int gpio_get_value_cansleep(unsigned gpio)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return 0;
}

static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
	/* GPIO can never have been requested or set as output */
	WARN_ON(1);
}

static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
	/* GPIO can never have been requested or set as {in,out}put */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_export_link(struct device *dev, const char *name,
				unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
	return -EINVAL;
}

static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
{
	/* GPIO can never have been requested */
	WARN_ON(1);
	return -EINVAL;
}

static inline void gpio_unexport(unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
}

static inline int gpio_to_irq(unsigned gpio)
{
	/* GPIO can never have been requested or set as input */
	WARN_ON(1);
	return -EINVAL;
}

static inline int irq_to_gpio(unsigned irq)
{
	/* irq can never have been returned from gpio_to_irq() */
	WARN_ON(1);
	return -EINVAL;
}

#endif

#endif /* __LINUX_GPIO_H */
Commit	Line	Data
7560fa60 DB	1	#ifndef __LINUX_GPIO_H
	2	#define __LINUX_GPIO_H
	3
	4	/* see Documentation/gpio.txt */
	5
c001fb72 RD	6	/* make these flag values available regardless of GPIO kconfig options */
	7	#define GPIOF_DIR_OUT (0 << 0)
	8	#define GPIOF_DIR_IN (1 << 0)
	9
	10	#define GPIOF_INIT_LOW (0 << 1)
	11	#define GPIOF_INIT_HIGH (1 << 1)
	12
	13	#define GPIOF_IN (GPIOF_DIR_IN)
	14	#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT \| GPIOF_INIT_LOW)
	15	#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT \| GPIOF_INIT_HIGH)
	16
7560fa60 DB	17	#ifdef CONFIG_GENERIC_GPIO
	18	#include <asm/gpio.h>
	19
	20	#else
	21
3d599d1c	22	#include <linux/kernel.h>
6ea0205b DB	23	#include <linux/types.h>
	24	#include <linux/errno.h>
	25
a4177ee7	26	struct device;
5f829e40	27	struct gpio;
4e4438b8	28	struct gpio_chip;
a4177ee7	29
7560fa60 DB	30	/*
	31	* Some platforms don't support the GPIO programming interface.
	32	*
	33	* In case some driver uses it anyway (it should normally have
	34	* depended on GENERIC_GPIO), these routines help the compiler
	35	* optimize out much GPIO-related code ... or trigger a runtime
	36	* warning when something is wrongly called.
	37	*/
	38
3474cb3c	39	static inline bool gpio_is_valid(int number)
7560fa60	40	{
3474cb3c	41	return false;
7560fa60 DB	42	}
7560fa60 DB	43
d8a3515e	44	static inline int gpio_request(unsigned gpio, const char *label)
7560fa60 DB	45	{
	46	return -ENOSYS;
	47	}
	48
323b7fe8	49	static inline int gpio_request_one(unsigned gpio,
5f829e40 WS	50	unsigned long flags, const char *label)
	51	{
	52	return -ENOSYS;
	53	}
	54
7c295975	55	static inline int gpio_request_array(const struct gpio *array, size_t num)
5f829e40 WS	56	{
	57	return -ENOSYS;
	58	}
	59
7560fa60 DB	60	static inline void gpio_free(unsigned gpio)
7560fa60 DB	61	{
3d599d1c UKK	62	might_sleep();
3d599d1c UKK	63
7560fa60 DB	64	/* GPIO can never have been requested */
	65	WARN_ON(1);
	66	}
	67
7c295975	68	static inline void gpio_free_array(const struct gpio *array, size_t num)
5f829e40 WS	69	{
	70	might_sleep();
	71
	72	/* GPIO can never have been requested */
	73	WARN_ON(1);
	74	}
	75
d8a3515e	76	static inline int gpio_direction_input(unsigned gpio)
7560fa60 DB	77	{
	78	return -ENOSYS;
	79	}
	80
d8a3515e	81	static inline int gpio_direction_output(unsigned gpio, int value)
7560fa60 DB	82	{
	83	return -ENOSYS;
	84	}
	85
c4b5be98 FB	86	static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
	87	{
	88	return -ENOSYS;
	89	}
	90
7560fa60 DB	91	static inline int gpio_get_value(unsigned gpio)
	92	{
	93	/* GPIO can never have been requested or set as {in,out}put */
	94	WARN_ON(1);
	95	return 0;
	96	}
	97
	98	static inline void gpio_set_value(unsigned gpio, int value)
	99	{
	100	/* GPIO can never have been requested or set as output */
	101	WARN_ON(1);
	102	}
	103
	104	static inline int gpio_cansleep(unsigned gpio)
	105	{
	106	/* GPIO can never have been requested or set as {in,out}put */
	107	WARN_ON(1);
	108	return 0;
	109	}
	110
	111	static inline int gpio_get_value_cansleep(unsigned gpio)
	112	{
	113	/* GPIO can never have been requested or set as {in,out}put */
	114	WARN_ON(1);
	115	return 0;
	116	}
	117
	118	static inline void gpio_set_value_cansleep(unsigned gpio, int value)
	119	{
	120	/* GPIO can never have been requested or set as output */
	121	WARN_ON(1);
	122	}
	123
d8f388d8 DB	124	static inline int gpio_export(unsigned gpio, bool direction_may_change)
	125	{
	126	/* GPIO can never have been requested or set as {in,out}put */
	127	WARN_ON(1);
	128	return -EINVAL;
	129	}
	130
a4177ee7 JN	131	static inline int gpio_export_link(struct device dev, const char name,
	132	unsigned gpio)
	133	{
	134	/* GPIO can never have been exported */
	135	WARN_ON(1);
	136	return -EINVAL;
	137	}
	138
07697461 JN	139	static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
	140	{
	141	/* GPIO can never have been requested */
	142	WARN_ON(1);
	143	return -EINVAL;
	144	}
a4177ee7	145
d8f388d8 DB	146	static inline void gpio_unexport(unsigned gpio)
	147	{
	148	/* GPIO can never have been exported */
	149	WARN_ON(1);
	150	}
	151
7560fa60 DB	152	static inline int gpio_to_irq(unsigned gpio)
	153	{
	154	/* GPIO can never have been requested or set as input */
	155	WARN_ON(1);
	156	return -EINVAL;
	157	}
	158
	159	static inline int irq_to_gpio(unsigned irq)
	160	{
	161	/* irq can never have been returned from gpio_to_irq() */
	162	WARN_ON(1);
	163	return -EINVAL;
	164	}
	165
	166	#endif
	167
	168	#endif /* __LINUX_GPIO_H */