Staging
v0.5.2
v0.5.2
https://github.com/torvalds/linux
Tip revision: 60b341b778cc2929df16c0a504c91621b3c6a4ad authored by Linus Torvalds on 24 February 2010, 18:52:17 UTC
Linux 2.6.33
Linux 2.6.33
Tip revision: 60b341b
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 */