cmd/button.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
   4  *
   5  * Based on led.c
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <dm.h>
  11 #include <button.h>
  12 #include <dm/uclass-internal.h>
  13
  14 static const char *const state_label[] = {
  15         [BUTTON_OFF]    = "off",
  16         [BUTTON_ON]     = "on",
  17 };
  18
  19 static int show_button_state(struct udevice *dev)
  20 {
  21         int ret;
  22
  23         ret = button_get_state(dev);
  24         if (ret >= BUTTON_COUNT)
  25                 ret = -EINVAL;
  26         if (ret >= 0)
  27                 printf("%s\n", state_label[ret]);
  28
  29         return ret;
  30 }
  31
  32 static int list_buttons(void)
  33 {
  34         struct udevice *dev;
  35         int ret;
  36
  37         for (uclass_find_first_device(UCLASS_BUTTON, &dev);
  38              dev;
  39              uclass_find_next_device(&dev)) {
  40                 struct button_uc_plat *plat = dev_get_uclass_plat(dev);
  41
  42                 if (!plat->label)
  43                         continue;
  44                 printf("%-15s ", plat->label);
  45                 if (device_active(dev)) {
  46                         ret = show_button_state(dev);
  47                         if (ret < 0)
  48                                 printf("Error %d\n", ret);
  49                 } else {
  50                         printf("<inactive>\n");
  51                 }
  52         }
  53
  54         return 0;
  55 }
  56
  57 int do_button(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  58 {
  59         const char *button_label;
  60         struct udevice *dev;
  61         int ret;
  62
  63         /* Validate arguments */
  64         if (argc < 2)
  65                 return CMD_RET_USAGE;
  66         button_label = argv[1];
  67         if (strncmp(button_label, "list", 4) == 0)
  68                 return list_buttons();
  69
  70         ret = button_get_by_label(button_label, &dev);
  71         if (ret) {
  72                 printf("Button '%s' not found (err=%d)\n", button_label, ret);
  73                 return CMD_RET_FAILURE;
  74         }
  75
  76         ret = show_button_state(dev);
  77
  78         return !ret;
  79 }
  80
  81 U_BOOT_CMD(
  82         button, 2, 1, do_button,
  83         "manage buttons",
  84         "<button_label> \tGet button state\n"
  85         "button list\t\tShow a list of buttons"
  86 );