#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 */