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acpi_gpio.h
Mika Westerberg
authored and
Linus Walleij
committed
Instead of open-coding ACPI GPIO resource lookup in each driver, we provide a helper function analogous to Device Tree version that allows drivers to specify which GPIO resource they are interested (using an index to the GPIO resources). The function then finds out the correct resource, translates the ACPI GPIO number to the corresponding Linux GPIO number and returns that. Signed-off-by:Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by:
acpi_gpio.h 1.03 KiB
#ifndef _LINUX_ACPI_GPIO_H_
#define _LINUX_ACPI_GPIO_H_
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio.h>
/**
* struct acpi_gpio_info - ACPI GPIO specific information
* @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
*/
struct acpi_gpio_info {
bool gpioint;
};
#ifdef CONFIG_GPIO_ACPI
int acpi_get_gpio(char *path, int pin);
int acpi_get_gpio_by_index(struct device *dev, int index,
struct acpi_gpio_info *info);
void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
#else /* CONFIG_GPIO_ACPI */
static inline int acpi_get_gpio(char *path, int pin)
{
return -ENODEV;
}
static inline int acpi_get_gpio_by_index(struct device *dev, int index,
struct acpi_gpio_info *info)
{
return -ENODEV;
}
static inline void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
static inline void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
#endif /* CONFIG_GPIO_ACPI */
#endif /* _LINUX_ACPI_GPIO_H_ */