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 #include <mach/gpio-samsung.h>
  14
  15 /* Number of camera port pins, without FIELD */
  16 #define S3C_CAMIF_NUM_GPIOS     13
  17
  18 /* Default camera port configuration helpers. */
  19
  20 static void camif_get_gpios(int *gpio_start, int *gpio_reset)
  21 {
  22 #ifdef CONFIG_ARCH_S3C24XX
  23         *gpio_start = S3C2410_GPJ(0);
  24         *gpio_reset = S3C2410_GPJ(12);
  25 #else
  26         /* s3c64xx */
  27         *gpio_start = S3C64XX_GPF(0);
  28         *gpio_reset = S3C64XX_GPF(3);
  29 #endif
  30 }
  31
  32 int s3c_camif_gpio_get(void)
  33 {
  34         int gpio_start, gpio_reset;
  35         int ret, i;
  36
  37         camif_get_gpios(&gpio_start, &gpio_reset);
  38
  39         for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
  40                 int gpio = gpio_start + i;
  41
  42                 if (gpio == gpio_reset)
  43                         continue;
  44
  45                 ret = gpio_request(gpio, "camif");
  46                 if (!ret)
  47                         ret = s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
  48                 if (ret) {
  49                         pr_err("failed to configure GPIO %d\n", gpio);
  50                         for (--i; i >= 0; i--)
  51                                 gpio_free(gpio--);
  52                         return ret;
  53                 }
  54                 s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
  55         }
  56
  57         return 0;
  58 }
  59
  60 void s3c_camif_gpio_put(void)
  61 {
  62         int i, gpio_start, gpio_reset;
  63
  64         camif_get_gpios(&gpio_start, &gpio_reset);
  65
  66         for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
  67                 int gpio = gpio_start + i;
  68                 if (gpio != gpio_reset)
  69                         gpio_free(gpio);
  70         }
  71 }