562 lines
15 KiB
C
562 lines
15 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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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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/**
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* Struct containing an array of descriptors that can be obtained using
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* gpiod_get_array().
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*/
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struct gpio_descs {
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unsigned int ndescs;
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struct gpio_desc *desc[];
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};
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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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#define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
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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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GPIOD_OUT_LOW_OPEN_DRAIN = GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_OPEN_DRAIN,
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GPIOD_OUT_HIGH_OPEN_DRAIN = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_OPEN_DRAIN,
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};
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#ifdef CONFIG_GPIOLIB
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/* Return the number of GPIOs associated with a device / function */
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int gpiod_count(struct device *dev, const char *con_id);
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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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struct gpio_descs *__must_check gpiod_get_array(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_descs *__must_check gpiod_get_array_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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void gpiod_put(struct gpio_desc *desc);
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void gpiod_put_array(struct gpio_descs *descs);
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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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struct gpio_descs *__must_check devm_gpiod_get_array(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_descs *__must_check
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devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags);
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void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
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void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
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int gpiod_get_direction(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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int gpiod_get_array_value(unsigned int array_size,
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struct gpio_desc **desc_array, int *value_array);
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void gpiod_set_value(struct gpio_desc *desc, int value);
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void gpiod_set_array_value(unsigned int array_size,
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struct gpio_desc **desc_array, int *value_array);
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int gpiod_get_raw_value(const struct gpio_desc *desc);
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int gpiod_get_raw_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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void gpiod_set_raw_value(struct gpio_desc *desc, int value);
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int gpiod_set_raw_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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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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int gpiod_get_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
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void gpiod_set_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
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int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
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int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
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int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
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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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int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name);
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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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/* Child properties interface */
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struct device_node;
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struct fwnode_handle;
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struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
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struct device_node *node,
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const char *propname, int index,
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enum gpiod_flags dflags,
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const char *label);
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struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
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const char *propname, int index,
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enum gpiod_flags dflags,
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const char *label);
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struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
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const char *con_id, int index,
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struct fwnode_handle *child,
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enum gpiod_flags flags,
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const char *label);
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#else /* CONFIG_GPIOLIB */
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static inline int gpiod_count(struct device *dev, const char *con_id)
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{
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return 0;
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}
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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 NULL;
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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 NULL;
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}
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static inline struct gpio_descs *__must_check
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gpiod_get_array(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_descs *__must_check
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gpiod_get_array_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 NULL;
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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(desc);
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}
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static inline void gpiod_put_array(struct gpio_descs *descs)
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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(descs);
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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 NULL;
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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 NULL;
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}
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static inline struct gpio_descs *__must_check
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devm_gpiod_get_array(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_descs *__must_check
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devm_gpiod_get_array_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 NULL;
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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(desc);
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}
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static inline void devm_gpiod_put_array(struct device *dev,
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struct gpio_descs *descs)
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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(descs);
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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(desc);
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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(desc);
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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(desc);
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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(desc);
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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(desc);
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return 0;
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}
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static inline int gpiod_get_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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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(desc);
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}
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static inline void gpiod_set_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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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(desc);
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return 0;
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}
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static inline int gpiod_get_raw_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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||
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|
return 0;
|
||
|
|
}
|
||
|
|
static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
}
|
||
|
|
static inline int gpiod_set_raw_array_value(unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
int *value_array)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc_array);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
int *value_array)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc_array);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
}
|
||
|
|
static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
int *value_array)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc_array);
|
||
|
|
}
|
||
|
|
static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
int *value_array)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc_array);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
|
||
|
|
int value)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
}
|
||
|
|
static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
int *value_array)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc_array);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return -ENOSYS;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return -ENOSYS;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_is_active_low(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline int gpiod_cansleep(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_to_irq(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int gpiod_set_consumer_name(struct gpio_desc *desc,
|
||
|
|
const char *name)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int desc_to_gpio(const struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
/* GPIO can never have been requested */
|
||
|
|
WARN_ON(desc);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Child properties interface */
|
||
|
|
struct device_node;
|
||
|
|
struct fwnode_handle;
|
||
|
|
|
||
|
|
static inline
|
||
|
|
struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
|
||
|
|
struct device_node *node,
|
||
|
|
const char *propname, int index,
|
||
|
|
enum gpiod_flags dflags,
|
||
|
|
const char *label)
|
||
|
|
{
|
||
|
|
return ERR_PTR(-ENOSYS);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline
|
||
|
|
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
|
||
|
|
const char *propname, int index,
|
||
|
|
enum gpiod_flags dflags,
|
||
|
|
const char *label)
|
||
|
|
{
|
||
|
|
return ERR_PTR(-ENOSYS);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline
|
||
|
|
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
|
||
|
|
const char *con_id, int index,
|
||
|
|
struct fwnode_handle *child,
|
||
|
|
enum gpiod_flags flags,
|
||
|
|
const char *label)
|
||
|
|
{
|
||
|
|
return ERR_PTR(-ENOSYS);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* CONFIG_GPIOLIB */
|
||
|
|
|
||
|
|
static inline
|
||
|
|
struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
|
||
|
|
const char *con_id,
|
||
|
|
struct fwnode_handle *child,
|
||
|
|
enum gpiod_flags flags,
|
||
|
|
const char *label)
|
||
|
|
{
|
||
|
|
return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
|
||
|
|
flags, label);
|
||
|
|
}
|
||
|
|
|
||
|
|
#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);
|
||
|
|
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 void gpiod_unexport(struct gpio_desc *desc)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
||
|
|
|
||
|
|
#endif
|