[linux-2.6-block.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)

/**
 * struct gpio - a structure describing a GPIO with configuration
 * @gpio:	the GPIO number
 * @flags:	GPIO configuration as specified by GPIOF_*
 * @label:	a literal description string of this GPIO
 */
struct gpio {
	unsigned	gpio;
	unsigned long	flags;
	const char	*label;
};

#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_chip;

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
feb83699 MB	17	/**
	18	* struct gpio - a structure describing a GPIO with configuration
	19	* @gpio: the GPIO number
	20	* @flags: GPIO configuration as specified by GPIOF_*
	21	* @label: a literal description string of this GPIO
	22	*/
	23	struct gpio {
	24	unsigned gpio;
	25	unsigned long flags;
	26	const char *label;
	27	};
	28
7560fa60 DB	29	#ifdef CONFIG_GENERIC_GPIO
	30	#include <asm/gpio.h>
	31
	32	#else
	33
3d599d1c	34	#include <linux/kernel.h>
6ea0205b DB	35	#include <linux/types.h>
	36	#include <linux/errno.h>
	37
a4177ee7	38	struct device;
4e4438b8	39	struct gpio_chip;
a4177ee7	40
3474cb3c	41	static inline bool gpio_is_valid(int number)
7560fa60	42	{
3474cb3c	43	return false;
7560fa60 DB	44	}
7560fa60 DB	45
d8a3515e	46	static inline int gpio_request(unsigned gpio, const char *label)
7560fa60 DB	47	{
	48	return -ENOSYS;
	49	}
	50
323b7fe8	51	static inline int gpio_request_one(unsigned gpio,
5f829e40 WS	52	unsigned long flags, const char *label)
	53	{
	54	return -ENOSYS;
	55	}
	56
7c295975	57	static inline int gpio_request_array(const struct gpio *array, size_t num)
5f829e40 WS	58	{
	59	return -ENOSYS;
	60	}
	61
7560fa60 DB	62	static inline void gpio_free(unsigned gpio)
7560fa60 DB	63	{
3d599d1c UKK	64	might_sleep();
3d599d1c UKK	65
7560fa60 DB	66	/* GPIO can never have been requested */
	67	WARN_ON(1);
	68	}
	69
7c295975	70	static inline void gpio_free_array(const struct gpio *array, size_t num)
5f829e40 WS	71	{
	72	might_sleep();
	73
	74	/* GPIO can never have been requested */
	75	WARN_ON(1);
	76	}
	77
d8a3515e	78	static inline int gpio_direction_input(unsigned gpio)
7560fa60 DB	79	{
	80	return -ENOSYS;
	81	}
	82
d8a3515e	83	static inline int gpio_direction_output(unsigned gpio, int value)
7560fa60 DB	84	{
	85	return -ENOSYS;
	86	}
	87
c4b5be98 FB	88	static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
	89	{
	90	return -ENOSYS;
	91	}
	92
7560fa60 DB	93	static inline int gpio_get_value(unsigned gpio)
	94	{
	95	/* GPIO can never have been requested or set as {in,out}put */
	96	WARN_ON(1);
	97	return 0;
	98	}
	99
	100	static inline void gpio_set_value(unsigned gpio, int value)
	101	{
	102	/* GPIO can never have been requested or set as output */
	103	WARN_ON(1);
	104	}
	105
	106	static inline int gpio_cansleep(unsigned gpio)
	107	{
	108	/* GPIO can never have been requested or set as {in,out}put */
	109	WARN_ON(1);
	110	return 0;
	111	}
	112
	113	static inline int gpio_get_value_cansleep(unsigned gpio)
	114	{
	115	/* GPIO can never have been requested or set as {in,out}put */
	116	WARN_ON(1);
	117	return 0;
	118	}
	119
	120	static inline void gpio_set_value_cansleep(unsigned gpio, int value)
	121	{
	122	/* GPIO can never have been requested or set as output */
	123	WARN_ON(1);
	124	}
	125
d8f388d8 DB	126	static inline int gpio_export(unsigned gpio, bool direction_may_change)
	127	{
	128	/* GPIO can never have been requested or set as {in,out}put */
	129	WARN_ON(1);
	130	return -EINVAL;
	131	}
	132
a4177ee7 JN	133	static inline int gpio_export_link(struct device dev, const char name,
	134	unsigned gpio)
	135	{
	136	/* GPIO can never have been exported */
	137	WARN_ON(1);
	138	return -EINVAL;
	139	}
	140
07697461 JN	141	static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
	142	{
	143	/* GPIO can never have been requested */
	144	WARN_ON(1);
	145	return -EINVAL;
	146	}
a4177ee7	147
d8f388d8 DB	148	static inline void gpio_unexport(unsigned gpio)
	149	{
	150	/* GPIO can never have been exported */
	151	WARN_ON(1);
	152	}
	153
7560fa60 DB	154	static inline int gpio_to_irq(unsigned gpio)
	155	{
	156	/* GPIO can never have been requested or set as input */
	157	WARN_ON(1);
	158	return -EINVAL;
	159	}
	160
	161	static inline int irq_to_gpio(unsigned irq)
	162	{
	163	/* irq can never have been returned from gpio_to_irq() */
	164	WARN_ON(1);
	165	return -EINVAL;
	166	}
	167
	168	#endif
	169
	170	#endif /* __LINUX_GPIO_H */