LXR uboot/drivers/misc/gpio

   1/*
   2 * Status LED driver based on GPIO access conventions of Linux
   3 *
   4 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   5 * Licensed under the GPL-2 or later.
   6 */
   7
   8#include <common.h>
   9#include <status_led.h>
  10#include <asm/gpio.h>
  11
  12#ifndef CONFIG_GPIO_LED_INVERTED_TABLE
  13#define CONFIG_GPIO_LED_INVERTED_TABLE {}
  14#endif
  15
  16static led_id_t gpio_led_inv[] = CONFIG_GPIO_LED_INVERTED_TABLE;
  17
  18static int gpio_led_gpio_value(led_id_t mask, int state)
  19{
  20        int i, gpio_value = (state == CONFIG_LED_STATUS_ON);
  21
  22        for (i = 0; i < ARRAY_SIZE(gpio_led_inv); i++) {
  23                if (gpio_led_inv[i] == mask)
  24                        gpio_value = !gpio_value;
  25        }
  26
  27        return gpio_value;
  28}
  29
  30void __led_init(led_id_t mask, int state)
  31{
  32        int gpio_value;
  33
  34        if (gpio_request(mask, "gpio_led") != 0) {
  35                printf("%s: failed requesting GPIO%lu!\n", __func__, mask);
  36                return;
  37        }
  38
  39        gpio_value = gpio_led_gpio_value(mask, state);
  40        gpio_direction_output(mask, gpio_value);
  41}
  42
  43void __led_set(led_id_t mask, int state)
  44{
  45        int gpio_value = gpio_led_gpio_value(mask, state);
  46
  47        gpio_set_value(mask, gpio_value);
  48}
  49
  50void __led_toggle(led_id_t mask)
  51{
  52        gpio_set_value(mask, !gpio_get_value(mask));
  53}
  54
  55#ifdef CONFIG_GPIO_LED_STUBS
  56
  57/* 'generic' override of colored LED stubs, to use GPIO functions instead */
  58
  59#ifdef CONFIG_LED_STATUS_RED
  60void red_led_on(void)
  61{
  62        __led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
  63}
  64
  65void red_led_off(void)
  66{
  67        __led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
  68}
  69#endif
  70
  71#ifdef CONFIG_LED_STATUS_GREEN
  72void green_led_on(void)
  73{
  74        __led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_ON);
  75}
  76
  77void green_led_off(void)
  78{
  79        __led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_OFF);
  80}
  81#endif
  82
  83#ifdef CONFIG_LED_STATUS_YELLOW
  84void yellow_led_on(void)
  85{
  86        __led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_ON);
  87}
  88
  89void yellow_led_off(void)
  90{
  91        __led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_OFF);
  92}
  93#endif
  94
  95#ifdef CONFIG_LED_STATUS_BLUE
  96void blue_led_on(void)
  97{
  98        __led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_ON);
  99}
 100
 101void blue_led_off(void)
 102{
 103        __led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_OFF);
 104}
 105#endif
 106
 107#endif /* CONFIG_GPIO_LED_STUBS */
 108