1. 根目录:
2. arch
3. arm
4. mach-s3c64xx
5. setup-keypad.c

/* linux/arch/arm/mach-s3c64xx/setup-keypad.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * GPIO configuration for S3C64XX KeyPad device
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/gpio.h>
#include <plat/gpio-cfg.h>
#include <plat/keypad.h>
#include <mach/gpio-samsung.h>

void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
{
	/* Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
	s3c_gpio_cfgrange_nopull(S3C64XX_GPK(8), rows, S3C_GPIO_SFN(3));

	/* Set all the necessary GPL pins to special-function 3: KP_COL[x] */
	s3c_gpio_cfgrange_nopull(S3C64XX_GPL(0), cols, S3C_GPIO_SFN(3));
}