bae48da237
Add gpiod_get(), gpiod_get_index() and gpiod_put() functions that provide safer management of GPIOs. These functions put the GPIO framework in line with the conventions of other frameworks in the kernel, and help ensure every GPIO is declared properly and valid while it is used. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
254 lines
6.4 KiB
C
254 lines
6.4 KiB
C
#ifndef __LINUX_GPIO_CONSUMER_H
|
|
#define __LINUX_GPIO_CONSUMER_H
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#ifdef CONFIG_GPIOLIB
|
|
|
|
struct device;
|
|
struct gpio_chip;
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/* Acquire and dispose GPIOs */
|
|
struct gpio_desc *__must_check gpiod_get(struct device *dev,
|
|
const char *con_id);
|
|
struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx);
|
|
void gpiod_put(struct gpio_desc *desc);
|
|
|
|
struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
|
|
const char *con_id);
|
|
struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx);
|
|
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);
|
|
|
|
/* 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);
|
|
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
|
|
|
|
#else /* CONFIG_GPIOLIB */
|
|
|
|
static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
|
|
const char *con_id)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
static inline struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
|
|
const char *con_id,
|
|
unsigned int idx)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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_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;
|
|
}
|
|
static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(1);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
|
|
#endif /* CONFIG_GPIOLIB */
|
|
|
|
#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
|