1 /* linux/arch/arm/mach-exynos4/setup-keypad.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * GPIO configuration for Exynos4 KeyPad device
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/gpio.h>
14 #include <plat/gpio-cfg.h>
15
samsung_keypad_cfg_gpio(unsigned int rows,unsigned int cols)16 void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
17 {
18 /* Keypads can be of various combinations, Just making sure */
19
20 if (rows > 8) {
21 /* Set all the necessary GPX2 pins: KP_ROW[0~7] */
22 s3c_gpio_cfgall_range(EXYNOS4_GPX2(0), 8, S3C_GPIO_SFN(3),
23 S3C_GPIO_PULL_UP);
24
25 /* Set all the necessary GPX3 pins: KP_ROW[8~] */
26 s3c_gpio_cfgall_range(EXYNOS4_GPX3(0), (rows - 8),
27 S3C_GPIO_SFN(3), S3C_GPIO_PULL_UP);
28 } else {
29 /* Set all the necessary GPX2 pins: KP_ROW[x] */
30 s3c_gpio_cfgall_range(EXYNOS4_GPX2(0), rows, S3C_GPIO_SFN(3),
31 S3C_GPIO_PULL_UP);
32 }
33
34 /* Set all the necessary GPX1 pins to special-function 3: KP_COL[x] */
35 s3c_gpio_cfgrange_nopull(EXYNOS4_GPX1(0), cols, S3C_GPIO_SFN(3));
36 }
37