cmd/led.c

   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
  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
  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
  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_plat(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
  74 int do_led(struct cmd_tbl *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 (strncmp(led_label, "list", 4) == 0)
  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 );