drivers/misc/gpio_led.c

   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
  16 static led_id_t gpio_led_inv[] = CONFIG_GPIO_LED_INVERTED_TABLE;
  17
  18 static 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
  30 void __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
  43 void __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
  50 void __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
  60 void red_led_on(void)
  61 {
  62         __led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
  63 }
  64
  65 void 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
  72 void green_led_on(void)
  73 {
  74         __led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_ON);
  75 }
  76
  77 void 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
  84 void yellow_led_on(void)
  85 {
  86         __led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_ON);
  87 }
  88
  89 void 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
  96 void blue_led_on(void)
  97 {
  98         __led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_ON);
  99 }
 100
 101 void 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 */