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 */ 108