linux-stable/include/linux/platform_data/keypad-omap.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  Copyright (C) 2006 Komal Shah <komal_shah802003@yahoo.com>
 */
#ifndef __KEYPAD_OMAP_H
#define __KEYPAD_OMAP_H

#ifndef CONFIG_ARCH_OMAP1
#warning Please update the board to use matrix-keypad driver
#define omap_readw(reg)		0
#define omap_writew(val, reg)	do {} while (0)
#endif
#include <linux/input/matrix_keypad.h>

struct omap_kp_platform_data {
	int rows;
	int cols;
	const struct matrix_keymap_data *keymap_data;
	bool rep;
	unsigned long delay;
	bool dbounce;
	/* specific to OMAP242x*/
	unsigned int *row_gpios;
	unsigned int *col_gpios;
};

/* Group (0..3) -- when multiple keys are pressed, only the
 * keys pressed in the same group are considered as pressed. This is
 * in order to workaround certain crappy HW designs that produce ghost
 * keypresses. Two free bits, not used by neither row/col nor keynum,
 * must be available for use as group bits. The below GROUP_SHIFT
 * macro definition is based on some prior knowledge of the
 * matrix_keypad defined KEY() macro internals.
 */
#define GROUP_SHIFT	14
#define GROUP_0		(0 << GROUP_SHIFT)
#define GROUP_1		(1 << GROUP_SHIFT)
#define GROUP_2		(2 << GROUP_SHIFT)
#define GROUP_3		(3 << GROUP_SHIFT)
#define GROUP_MASK	GROUP_3
#if KEY_MAX & GROUP_MASK
#error Group bits in conflict with keynum bits
#endif


#endif