#ifndef __LINUX_GPIO_CONSUMER_H #define __LINUX_GPIO_CONSUMER_H #include <linux/bug.h> #include <linux/err.h> #include <linux/kernel.h> struct device; /** * Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are * preferable to the old integer-based handles. * * Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid * until the GPIO is released. */ struct gpio_desc; #define GPIOD_FLAGS_BIT_DIR_SET BIT(0) #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1) #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2) /** * Optional flags that can be passed to one of gpiod_* to configure direction * and output value. These values cannot be OR'd. */ enum gpiod_flags { GPIOD_ASIS = 0, GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET, GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT, GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT | GPIOD_FLAGS_BIT_DIR_VAL, }; #ifdef CONFIG_GPIOLIB /* Acquire and dispose GPIOs */ struct gpio_desc *__must_check __gpiod_get(struct device *dev, const char *con_id, enum gpiod_flags flags); struct gpio_desc *__must_check __gpiod_get_index(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags flags); struct gpio_desc *__must_check __gpiod_get_optional(struct device *dev, const char *con_id, enum gpiod_flags flags); struct gpio_desc *__must_check __gpiod_get_index_optional(struct device *dev, const char *con_id, unsigned int index, enum gpiod_flags flags); void gpiod_put(struct gpio_desc *desc); struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev, const char *con_id, enum gpiod_flags flags); struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags flags); struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev, const char *con_id, enum gpiod_flags flags); struct gpio_desc *__must_check __devm_gpiod_get_index_optional(struct device *dev, const char *con_id, unsigned int index, enum gpiod_flags flags); void devm_gpiod_put(struct device *dev, struct gpio_desc *desc); int gpiod_get_direction(const struct gpio_desc *desc); int gpiod_direction_input(struct gpio_desc *desc); int gpiod_direction_output(struct gpio_desc *desc, int value); int gpiod_direction_output_raw(struct gpio_desc *desc, int value); /* Value get/set from non-sleeping context */ int gpiod_get_value(const struct gpio_desc *desc); void gpiod_set_value(struct gpio_desc *desc, int value); int gpiod_get_raw_value(const struct gpio_desc *desc); void gpiod_set_raw_value(struct gpio_desc *desc, int value); /* Value get/set from sleeping context */ int gpiod_get_value_cansleep(const struct gpio_desc *desc); void gpiod_set_value_cansleep(struct gpio_desc *desc, int value); int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc); void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value); int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce); int gpiod_is_active_low(const struct gpio_desc *desc); int gpiod_cansleep(const struct gpio_desc *desc); int gpiod_to_irq(const struct gpio_desc *desc); /* Convert between the old gpio_ and new gpiod_ interfaces */ struct gpio_desc *gpio_to_desc(unsigned gpio); int desc_to_gpio(const struct gpio_desc *desc); #else /* CONFIG_GPIOLIB */ static inline struct gpio_desc *__must_check __gpiod_get(struct device *dev, const char *con_id, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __gpiod_get_index(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __gpiod_get_optional(struct device *dev, const char *con_id, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __gpiod_get_index_optional(struct device *dev, const char *con_id, unsigned int index, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline void gpiod_put(struct gpio_desc *desc) { might_sleep(); /* GPIO can never have been requested */ WARN_ON(1); } static inline struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev, const char *con_id, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev, const char *con_id, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline struct gpio_desc *__must_check __devm_gpiod_get_index_optional(struct device *dev, const char *con_id, unsigned int index, enum gpiod_flags flags) { return ERR_PTR(-ENOSYS); } static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc) { might_sleep(); /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpiod_get_direction(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return -ENOSYS; } static inline int gpiod_direction_input(struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return -ENOSYS; } static inline int gpiod_direction_output(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); return -ENOSYS; } static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); return -ENOSYS; } static inline int gpiod_get_value(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline void gpiod_set_value(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpiod_get_raw_value(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) { /* GPIO can never have been requested */ WARN_ON(1); } static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) { /* GPIO can never have been requested */ WARN_ON(1); return -ENOSYS; } static inline int gpiod_is_active_low(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline int gpiod_cansleep(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return 0; } static inline int gpiod_to_irq(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return -EINVAL; } static inline struct gpio_desc *gpio_to_desc(unsigned gpio) { return ERR_PTR(-EINVAL); } static inline int desc_to_gpio(const struct gpio_desc *desc) { /* GPIO can never have been requested */ WARN_ON(1); return -EINVAL; } #endif /* CONFIG_GPIOLIB */ /* * Vararg-hacks! This is done to transition the kernel to always pass * the options flags argument to the below functions. During a transition * phase these vararg macros make both old-and-newstyle code compile, * but when all calls to the elder API are removed, these should go away * and the __gpiod_get() etc functions above be renamed just gpiod_get() * etc. */ #define __gpiod_get(dev, con_id, flags, ...) __gpiod_get(dev, con_id, flags) #define gpiod_get(varargs...) __gpiod_get(varargs, 0) #define __gpiod_get_index(dev, con_id, index, flags, ...) \ __gpiod_get_index(dev, con_id, index, flags) #define gpiod_get_index(varargs...) __gpiod_get_index(varargs, 0) #define __gpiod_get_optional(dev, con_id, flags, ...) \ __gpiod_get_optional(dev, con_id, flags) #define gpiod_get_optional(varargs...) __gpiod_get_optional(varargs, 0) #define __gpiod_get_index_optional(dev, con_id, index, flags, ...) \ __gpiod_get_index_optional(dev, con_id, index, flags) #define gpiod_get_index_optional(varargs...) \ __gpiod_get_index_optional(varargs, 0) #define __devm_gpiod_get(dev, con_id, flags, ...) \ __devm_gpiod_get(dev, con_id, flags) #define devm_gpiod_get(varargs...) __devm_gpiod_get(varargs, 0) #define __devm_gpiod_get_index(dev, con_id, index, flags, ...) \ __devm_gpiod_get_index(dev, con_id, index, flags) #define devm_gpiod_get_index(varargs...) __devm_gpiod_get_index(varargs, 0) #define __devm_gpiod_get_optional(dev, con_id, flags, ...) \ __devm_gpiod_get_optional(dev, con_id, flags) #define devm_gpiod_get_optional(varargs...) \ __devm_gpiod_get_optional(varargs, 0) #define __devm_gpiod_get_index_optional(dev, con_id, index, flags, ...) \ __devm_gpiod_get_index_optional(dev, con_id, index, flags) #define devm_gpiod_get_index_optional(varargs...) \ __devm_gpiod_get_index_optional(varargs, 0) #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS) int gpiod_export(struct gpio_desc *desc, bool direction_may_change); int gpiod_export_link(struct device *dev, const char *name, struct gpio_desc *desc); int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value); void gpiod_unexport(struct gpio_desc *desc); #else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */ static inline int gpiod_export(struct gpio_desc *desc, bool direction_may_change) { return -ENOSYS; } static inline int gpiod_export_link(struct device *dev, const char *name, struct gpio_desc *desc) { return -ENOSYS; } static inline int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value) { return -ENOSYS; } static inline void gpiod_unexport(struct gpio_desc *desc) { } #endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */ #endif