LXR uboot/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
  14static const char *const state_label[] = {
  15        [BUTTON_OFF]    = "off",
  16        [BUTTON_ON]     = "on",
  17};
  18
  19static 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
  32static 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_platdata(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
  57int 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
  81U_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);
  87