[GitHub/mt8127/android_kernel_alcatel_ttab.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>

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