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
show_button_state(struct udevice * dev)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
list_buttons(void)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
do_button(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])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 );
87