[mirror_ubuntu-artful-kernel.git] / include / linux / gpio.h

#ifndef __LINUX_GPIO_H
#define __LINUX_GPIO_H

/* see Documentation/gpio.txt */

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

#else

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

struct device;

/*
 * 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 int gpio_is_valid(int number)
{
	return 0;
}

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

static inline void gpio_free(unsigned gpio)
{
	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_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
	6	#ifdef CONFIG_GENERIC_GPIO
	7	#include <asm/gpio.h>
	8
	9	#else
	10
3d599d1c	11	#include <linux/kernel.h>
6ea0205b DB	12	#include <linux/types.h>
	13	#include <linux/errno.h>
	14
a4177ee7 JN	15	struct device;
a4177ee7 JN	16
7560fa60 DB	17	/*
	18	* Some platforms don't support the GPIO programming interface.
	19	*
	20	* In case some driver uses it anyway (it should normally have
	21	* depended on GENERIC_GPIO), these routines help the compiler
	22	* optimize out much GPIO-related code ... or trigger a runtime
	23	* warning when something is wrongly called.
	24	*/
	25
	26	static inline int gpio_is_valid(int number)
	27	{
	28	return 0;
	29	}
	30
	31	static inline int gpio_request(unsigned gpio, const char *label)
	32	{
	33	return -ENOSYS;
	34	}
	35
	36	static inline void gpio_free(unsigned gpio)
	37	{
3d599d1c UKK	38	might_sleep();
3d599d1c UKK	39
7560fa60 DB	40	/* GPIO can never have been requested */
	41	WARN_ON(1);
	42	}
	43
	44	static inline int gpio_direction_input(unsigned gpio)
	45	{
	46	return -ENOSYS;
	47	}
	48
	49	static inline int gpio_direction_output(unsigned gpio, int value)
	50	{
	51	return -ENOSYS;
	52	}
	53
	54	static inline int gpio_get_value(unsigned gpio)
	55	{
	56	/* GPIO can never have been requested or set as {in,out}put */
	57	WARN_ON(1);
	58	return 0;
	59	}
	60
	61	static inline void gpio_set_value(unsigned gpio, int value)
	62	{
	63	/* GPIO can never have been requested or set as output */
	64	WARN_ON(1);
	65	}
	66
	67	static inline int gpio_cansleep(unsigned gpio)
	68	{
	69	/* GPIO can never have been requested or set as {in,out}put */
	70	WARN_ON(1);
	71	return 0;
	72	}
	73
	74	static inline int gpio_get_value_cansleep(unsigned gpio)
	75	{
	76	/* GPIO can never have been requested or set as {in,out}put */
	77	WARN_ON(1);
	78	return 0;
	79	}
	80
	81	static inline void gpio_set_value_cansleep(unsigned gpio, int value)
	82	{
	83	/* GPIO can never have been requested or set as output */
	84	WARN_ON(1);
	85	}
	86
d8f388d8 DB	87	static inline int gpio_export(unsigned gpio, bool direction_may_change)
	88	{
	89	/* GPIO can never have been requested or set as {in,out}put */
	90	WARN_ON(1);
	91	return -EINVAL;
	92	}
	93
a4177ee7 JN	94	static inline int gpio_export_link(struct device dev, const char name,
	95	unsigned gpio)
	96	{
	97	/* GPIO can never have been exported */
	98	WARN_ON(1);
	99	return -EINVAL;
	100	}
	101
07697461 JN	102	static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
	103	{
	104	/* GPIO can never have been requested */
	105	WARN_ON(1);
	106	return -EINVAL;
	107	}
a4177ee7	108
d8f388d8 DB	109	static inline void gpio_unexport(unsigned gpio)
	110	{
	111	/* GPIO can never have been exported */
	112	WARN_ON(1);
	113	}
	114
7560fa60 DB	115	static inline int gpio_to_irq(unsigned gpio)
	116	{
	117	/* GPIO can never have been requested or set as input */
	118	WARN_ON(1);
	119	return -EINVAL;
	120	}
	121
	122	static inline int irq_to_gpio(unsigned irq)
	123	{
	124	/* irq can never have been returned from gpio_to_irq() */
	125	WARN_ON(1);
	126	return -EINVAL;
	127	}
	128
	129	#endif
	130
	131	#endif /* __LINUX_GPIO_H */