#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 */