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