release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-s3c64xx/setup-keypad.c

   1 /* linux/arch/arm/mach-s3c64xx/setup-keypad.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com/
   5  *
   6  * GPIO configuration for S3C64XX 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         unsigned int gpio;
  19         unsigned int end;
  20
  21         /* Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
  22         end = S3C64XX_GPK(8 + rows);
  23         for (gpio = S3C64XX_GPK(8); gpio < end; gpio++) {
  24                 s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(3));
  25                 s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
  26         }
  27
  28         /* Set all the necessary GPL pins to special-function 3: KP_COL[x] */
  29         end = S3C64XX_GPL(0 + cols);
  30         for (gpio = S3C64XX_GPL(0); gpio < end; gpio++) {
  31                 s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(3));
  32                 s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
  33         }
  34 }