1. 根目录:
2. include
3. linux
4. gpio_keys.h

#ifndef _GPIO_KEYS_H
#define _GPIO_KEYS_H

struct gpio_keys_button {
	/* Configuration parameters */
	int code;		/* input event code (KEY_*, SW_*) */
	int gpio;
	int active_low;
	char *desc;
	int type;		/* input event type (EV_KEY, EV_SW) */
	int wakeup;		/* configure the button as a wake-up source */
	int debounce_interval;	/* debounce ticks interval in msecs */
	bool can_disable;
};

struct gpio_keys_platform_data {
	struct gpio_keys_button *buttons;
	int nbuttons;
	unsigned int poll_interval;	/* polling interval in msecs -
					   for polling driver only */
	unsigned int rep:1;		/* enable input subsystem auto repeat */
	int (*enable)(struct device *dev);
	void (*disable)(struct device *dev);
};

#endif