1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2017 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <command.h>
9 #include <dm.h>
10 #include <led.h>
11 #include <dm/uclass-internal.h>
12
13 #define LED_TOGGLE LEDST_COUNT
14
15 static const char *const state_label[] = {
16 [LEDST_OFF] = "off",
17 [LEDST_ON] = "on",
18 [LEDST_TOGGLE] = "toggle",
19 #ifdef CONFIG_LED_BLINK
20 [LEDST_BLINK] = "blink",
21 #endif
22 };
23
get_led_cmd(char * var)24 enum led_state_t get_led_cmd(char *var)
25 {
26 int i;
27
28 for (i = 0; i < LEDST_COUNT; i++) {
29 if (!strncmp(var, state_label[i], strlen(var)))
30 return i;
31 }
32
33 return -1;
34 }
35
show_led_state(struct udevice * dev)36 static int show_led_state(struct udevice *dev)
37 {
38 int ret;
39
40 ret = led_get_state(dev);
41 if (ret >= LEDST_COUNT)
42 ret = -EINVAL;
43 if (ret >= 0)
44 printf("%s\n", state_label[ret]);
45
46 return ret;
47 }
48
list_leds(void)49 static int list_leds(void)
50 {
51 struct udevice *dev;
52 int ret;
53
54 for (uclass_find_first_device(UCLASS_LED, &dev);
55 dev;
56 uclass_find_next_device(&dev)) {
57 struct led_uc_plat *plat = dev_get_uclass_platdata(dev);
58
59 if (!plat->label)
60 continue;
61 printf("%-15s ", plat->label);
62 if (device_active(dev)) {
63 ret = show_led_state(dev);
64 if (ret < 0)
65 printf("Error %d\n", ret);
66 } else {
67 printf("<inactive>\n");
68 }
69 }
70
71 return 0;
72 }
73
do_led(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])74 int do_led(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
75 {
76 enum led_state_t cmd;
77 const char *led_label;
78 struct udevice *dev;
79 #ifdef CONFIG_LED_BLINK
80 int freq_ms = 0;
81 #endif
82 int ret;
83
84 /* Validate arguments */
85 if (argc < 2)
86 return CMD_RET_USAGE;
87 led_label = argv[1];
88 if (*led_label == 'l')
89 return list_leds();
90
91 cmd = argc > 2 ? get_led_cmd(argv[2]) : LEDST_COUNT;
92 #ifdef CONFIG_LED_BLINK
93 if (cmd == LEDST_BLINK) {
94 if (argc < 4)
95 return CMD_RET_USAGE;
96 freq_ms = simple_strtoul(argv[3], NULL, 10);
97 }
98 #endif
99 ret = led_get_by_label(led_label, &dev);
100 if (ret) {
101 printf("LED '%s' not found (err=%d)\n", led_label, ret);
102 return CMD_RET_FAILURE;
103 }
104 switch (cmd) {
105 case LEDST_OFF:
106 case LEDST_ON:
107 case LEDST_TOGGLE:
108 ret = led_set_state(dev, cmd);
109 break;
110 #ifdef CONFIG_LED_BLINK
111 case LEDST_BLINK:
112 ret = led_set_period(dev, freq_ms);
113 if (!ret)
114 ret = led_set_state(dev, LEDST_BLINK);
115 break;
116 #endif
117 case LEDST_COUNT:
118 printf("LED '%s': ", led_label);
119 ret = show_led_state(dev);
120 break;
121 }
122 if (ret < 0) {
123 printf("LED '%s' operation failed (err=%d)\n", led_label, ret);
124 return CMD_RET_FAILURE;
125 }
126
127 return 0;
128 }
129
130 #ifdef CONFIG_LED_BLINK
131 #define BLINK "|blink [blink-freq in ms]"
132 #else
133 #define BLINK ""
134 #endif
135
136 U_BOOT_CMD(
137 led, 4, 1, do_led,
138 "manage LEDs",
139 "<led_label> on|off|toggle" BLINK "\tChange LED state\n"
140 "led [<led_label>\tGet LED state\n"
141 "led list\t\tshow a list of LEDs"
142 );
143