1. 根目录:
2. include
3. linux
4. input
5. gpio_tilt.h

#ifndef _INPUT_GPIO_TILT_H
#define _INPUT_GPIO_TILT_H

/**
 * struct gpio_tilt_axis - Axis used by the tilt switch
 * @axis:		Constant describing the axis, e.g. ABS_X
 * @min:		minimum value for abs_param
 * @max:		maximum value for abs_param
 * @fuzz:		fuzz value for abs_param
 * @flat:		flat value for abs_param
 */
struct gpio_tilt_axis {
	int axis;
	int min;
	int max;
	int fuzz;
	int flat;
};

/**
 * struct gpio_tilt_state - state description
 * @gpios:		bitfield of gpio target-states for the value
 * @axes:		array containing the axes settings for the gpio state
 *			The array indizes must correspond to the axes defined
 *			in platform_data
 *
 * This structure describes a supported axis settings
 * and the necessary gpio-state which represent it.
 *
 * The n-th bit in the bitfield describes the state of the n-th GPIO
 * from the gpios-array defined in gpio_regulator_config below.
 */
struct gpio_tilt_state {
	int gpios;
	int *axes;
};

/**
 * struct gpio_tilt_platform_data
 * @gpios:		Array containing the gpios determining the tilt state
 * @nr_gpios:		Number of gpios
 * @axes:		Array of gpio_tilt_axis descriptions
 * @nr_axes:		Number of axes
 * @states:		Array of gpio_tilt_state entries describing
 *			the gpio state for specific tilts
 * @nr_states:		Number of states available
 * @debounce_interval:	debounce ticks interval in msecs
 * @poll_interval:	polling interval in msecs - for polling driver only
 * @enable:		callback to enable the tilt switch
 * @disable:		callback to disable the tilt switch
 *
 * This structure contains gpio-tilt-switch configuration
 * information that must be passed by platform code to the
 * gpio-tilt input driver.
 */
struct gpio_tilt_platform_data {
	struct gpio *gpios;
	int nr_gpios;

	struct gpio_tilt_axis *axes;
	int nr_axes;

	struct gpio_tilt_state *states;
	int nr_states;

	int debounce_interval;

	unsigned int poll_interval;
	int (*enable)(struct device *dev);
	void (*disable)(struct device *dev);
};

#endif