arch/arm/plat-samsung/setup-camif.c

   1 /*
   2  * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
   3  *
   4  * Helper functions for S3C24XX/S3C64XX SoC series CAMIF driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/gpio.h>
  12 #include <plat/gpio-cfg.h>
  13
  14 /* Number of camera port pins, without FIELD */
  15 #define S3C_CAMIF_NUM_GPIOS     13
  16
  17 /* Default camera port configuration helpers. */
  18
  19 static void camif_get_gpios(int *gpio_start, int *gpio_reset)
  20 {
  21 #ifdef CONFIG_ARCH_S3C24XX
  22         *gpio_start = S3C2410_GPJ(0);
  23         *gpio_reset = S3C2410_GPJ(12);
  24 #else
  25         /* s3c64xx */
  26         *gpio_start = S3C64XX_GPF(0);
  27         *gpio_reset = S3C64XX_GPF(3);
  28 #endif
  29 }
  30
  31 int s3c_camif_gpio_get(void)
  32 {
  33         int gpio_start, gpio_reset;
  34         int ret, i;
  35
  36         camif_get_gpios(&gpio_start, &gpio_reset);
  37
  38         for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
  39                 int gpio = gpio_start + i;
  40
  41                 if (gpio == gpio_reset)
  42                         continue;
  43
  44                 ret = gpio_request(gpio, "camif");
  45                 if (!ret)
  46                         ret = s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
  47                 if (ret) {
  48                         pr_err("failed to configure GPIO %d\n", gpio);
  49                         for (--i; i >= 0; i--)
  50                                 gpio_free(gpio--);
  51                         return ret;
  52                 }
  53                 s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
  54         }
  55
  56         return 0;
  57 }
  58
  59 void s3c_camif_gpio_put(void)
  60 {
  61         int i, gpio_start, gpio_reset;
  62
  63         camif_get_gpios(&gpio_start, &gpio_reset);
  64
  65         for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
  66                 int gpio = gpio_start + i;
  67                 if (gpio != gpio_reset)
  68                         gpio_free(gpio);
  69         }
  70 }