root/include/linux/gpio.h

INCLUDED FROM

DEFINITIONS

1. gpio_get_value
2. gpio_set_value
3. gpio_cansleep
4. gpio_to_irq
5. irq_to_gpio
6. gpio_is_valid
7. gpio_request
8. gpio_request_one
9. gpio_request_array
10. gpio_free
11. gpio_free_array
12. gpio_direction_input
13. gpio_direction_output
14. gpio_set_debounce
15. gpio_get_value
16. gpio_set_value
17. gpio_cansleep
18. gpio_get_value_cansleep
19. gpio_set_value_cansleep
20. gpio_export
21. gpio_export_link
22. gpio_sysfs_set_active_low
23. gpio_unexport
24. gpio_to_irq
25. gpio_lock_as_irq
26. gpio_unlock_as_irq
27. irq_to_gpio
28. gpiochip_add_pin_range
29. gpiochip_add_pingroup_range
30. gpiochip_remove_pin_ranges
31. devm_gpio_request
32. devm_gpio_request_one
33. devm_gpio_free

#ifndef __LINUX_GPIO_H
#define __LINUX_GPIO_H

#include <linux/errno.h>

/* see Documentation/gpio/gpio-legacy.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)

/* Gpio pin is active-low */
#define GPIOF_ACTIVE_LOW        (1 << 2)

/* Gpio pin is open drain */
#define GPIOF_OPEN_DRAIN        (1 << 3)

/* Gpio pin is open source */
#define GPIOF_OPEN_SOURCE       (1 << 4)

#define GPIOF_EXPORT            (1 << 5)
#define GPIOF_EXPORT_CHANGEABLE (1 << 6)
#define GPIOF_EXPORT_DIR_FIXED  (GPIOF_EXPORT)
#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)

/**
 * 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_GPIOLIB

#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
#include <asm/gpio.h>
#else

#include <asm-generic/gpio.h>

static inline int gpio_get_value(unsigned int gpio)
{
        return __gpio_get_value(gpio);
}

static inline void gpio_set_value(unsigned int gpio, int value)
{
        __gpio_set_value(gpio, value);
}

static inline int gpio_cansleep(unsigned int gpio)
{
        return __gpio_cansleep(gpio);
}

static inline int gpio_to_irq(unsigned int gpio)
{
        return __gpio_to_irq(gpio);
}

static inline int irq_to_gpio(unsigned int irq)
{
        return -EINVAL;
}

#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */

/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */

struct device;

int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
int devm_gpio_request_one(struct device *dev, unsigned gpio,
                          unsigned long flags, const char *label);
void devm_gpio_free(struct device *dev, unsigned int gpio);

#else /* ! CONFIG_GPIOLIB */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bug.h>
#include <linux/pinctrl/pinctrl.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 gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
{
        WARN_ON(1);
        return -EINVAL;
}

static inline void gpio_unlock_as_irq(struct gpio_chip *chip,
                                      unsigned int offset)
{
        WARN_ON(1);
}

static inline int irq_to_gpio(unsigned irq)
{
        /* irq can never have been returned from gpio_to_irq() */
        WARN_ON(1);
        return -EINVAL;
}

static inline int
gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
                       unsigned int gpio_offset, unsigned int pin_offset,
                       unsigned int npins)
{
        WARN_ON(1);
        return -EINVAL;
}

static inline int
gpiochip_add_pingroup_range(struct gpio_chip *chip,
                        struct pinctrl_dev *pctldev,
                        unsigned int gpio_offset, const char *pin_group)
{
        WARN_ON(1);
        return -EINVAL;
}

static inline void
gpiochip_remove_pin_ranges(struct gpio_chip *chip)
{
        WARN_ON(1);
}

static inline int devm_gpio_request(struct device *dev, unsigned gpio,
                                    const char *label)
{
        WARN_ON(1);
        return -EINVAL;
}

static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
                                        unsigned long flags, const char *label)
{
        WARN_ON(1);
        return -EINVAL;
}

static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
{
        WARN_ON(1);
}

#endif /* ! CONFIG_GPIOLIB */

#endif /* __LINUX_GPIO_H */