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
gpio_led_gpio_value(led_id_t mask,int state)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
__led_init(led_id_t mask,int state)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
__led_set(led_id_t mask,int state)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
__led_toggle(led_id_t mask)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
red_led_on(void)60 void red_led_on(void)
61 {
62 __led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
63 }
64
red_led_off(void)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
green_led_on(void)72 void green_led_on(void)
73 {
74 __led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_ON);
75 }
76
green_led_off(void)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
yellow_led_on(void)84 void yellow_led_on(void)
85 {
86 __led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_ON);
87 }
88
yellow_led_off(void)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
blue_led_on(void)96 void blue_led_on(void)
97 {
98 __led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_ON);
99 }
100
blue_led_off(void)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