arch/arm/mach-exynos/setup-keypad.c

   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
  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 }