LXR linux/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
  20static 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
  32int 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
  60void 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}
  72