include/linux/input/matrix_keypad.h

#ifndef _MATRIX_KEYPAD_H
#define _MATRIX_KEYPAD_H

#include <linux/types.h>
#include <linux/input.h>

#define MATRIX_MAX_ROWS		16
#define MATRIX_MAX_COLS		16

#define KEY(row, col, val)	((((row) & (MATRIX_MAX_ROWS - 1)) << 24) |\
				 (((col) & (MATRIX_MAX_COLS - 1)) << 16) |\
				 (val & 0xffff))

#define KEY_ROW(k)		(((k) >> 24) & 0xff)
#define KEY_COL(k)		(((k) >> 16) & 0xff)
#define KEY_VAL(k)		((k) & 0xffff)

/**
 * struct matrix_keymap_data - keymap for matrix keyboards
 * @keymap: pointer to array of uint32 values encoded with KEY() macro
 *	representing keymap
 * @keymap_size: number of entries (initialized) in this keymap
 * @max_keymap_size: maximum size of keymap supported by the device
 *
 * This structure is supposed to be used by platform code to supply
 * keymaps to drivers that implement matrix-like keypads/keyboards.
 */
struct matrix_keymap_data {
	const uint32_t *keymap;
	unsigned int	keymap_size;
	unsigned int	max_keymap_size;
};

/**
 * struct matrix_keypad_platform_data - platform-dependent keypad data
 * @keymap_data: pointer to &matrix_keymap_data
 * @row_gpios: array of gpio numbers reporesenting rows
 * @col_gpios: array of gpio numbers reporesenting colums
 * @num_row_gpios: actual number of row gpios used by device
 * @num_col_gpios: actual number of col gpios used by device
 * @col_scan_delay_us: delay, measured in microseconds, that is
 *	needed before we can keypad after activating column gpio
 * @debounce_ms: debounce interval in milliseconds
 *
 * This structure represents platform-specific data that use used by
 * matrix_keypad driver to perform proper initialization.
 */
struct matrix_keypad_platform_data {
	const struct matrix_keymap_data *keymap_data;

	unsigned int	row_gpios[MATRIX_MAX_ROWS];
	unsigned int	col_gpios[MATRIX_MAX_COLS];
	unsigned int	num_row_gpios;
	unsigned int	num_col_gpios;

	unsigned int	col_scan_delay_us;

	/* key debounce interval in milli-second */
	unsigned int	debounce_ms;

	bool		active_low;
	bool		wakeup;
};

#endif /* _MATRIX_KEYPAD_H */