Skip to content
Snippets Groups Projects
gpio_led.c 1.1 KiB
Newer Older
  • Learn to ignore specific revisions
  • /*
     * 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 == STATUS_LED_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)
    {
    
    	if (gpio_request(mask, "gpio_led") != 0) {
    		printf("%s: failed requesting GPIO%lu!\n", __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));
    }