Eric Lee / smarc-uboot

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drivers/misc/gpio_led.c 2.08 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * Status LED driver based on GPIO access conventions of Linux
   *
   * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   * Licensed under the GPL-2 or later.
   */
  
  #include <common.h>
  #include <status_led.h>
  #include <asm/gpio.h>
  
  #ifndef CONFIG_GPIO_LED_INVERTED_TABLE
  #define CONFIG_GPIO_LED_INVERTED_TABLE {}
  #endif
  
  static led_id_t gpio_led_inv[] = CONFIG_GPIO_LED_INVERTED_TABLE;
  
  static int gpio_led_gpio_value(led_id_t mask, int state)
  {
  	int i, gpio_value = (state == CONFIG_LED_STATUS_ON);
  
  	for (i = 0; i < ARRAY_SIZE(gpio_led_inv); i++) {
  		if (gpio_led_inv[i] == mask)
  			gpio_value = !gpio_value;
  	}
  
  	return gpio_value;
  }
  
  void __led_init(led_id_t mask, int state)
  {
  	int gpio_value;
  
  	if (gpio_request(mask, "gpio_led") != 0) {
  		printf("%s: failed requesting GPIO%lu!
  ", __func__, mask);
  		return;
  	}
  
  	gpio_value = gpio_led_gpio_value(mask, state);
  	gpio_direction_output(mask, gpio_value);
  }
  
  void __led_set(led_id_t mask, int state)
  {
  	int gpio_value = gpio_led_gpio_value(mask, state);
  
  	gpio_set_value(mask, gpio_value);
  }
  
  void __led_toggle(led_id_t mask)
  {
  	gpio_set_value(mask, !gpio_get_value(mask));
  }
  
  #ifdef CONFIG_GPIO_LED_STUBS
  
  /* 'generic' override of colored LED stubs, to use GPIO functions instead */
  
  #ifdef CONFIG_LED_STATUS_RED
  void red_led_on(void)
  {
  	__led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
  }
  
  void red_led_off(void)
  {
  	__led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
  }
  #endif
  
  #ifdef CONFIG_LED_STATUS_GREEN
  void green_led_on(void)
  {
  	__led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_ON);
  }
  
  void green_led_off(void)
  {
  	__led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_OFF);
  }
  #endif
  
  #ifdef CONFIG_LED_STATUS_YELLOW
  void yellow_led_on(void)
  {
  	__led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_ON);
  }
  
  void yellow_led_off(void)
  {
  	__led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_OFF);
  }
  #endif
  
  #ifdef CONFIG_LED_STATUS_BLUE
  void blue_led_on(void)
  {
  	__led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_ON);
  }
  
  void blue_led_off(void)
  {
  	__led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_OFF);
  }
  #endif
  
  #endif /* CONFIG_GPIO_LED_STUBS */