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https://github.com/AsahiLinux/u-boot
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a6bfd71a96
To make the button command useful in a shell script it should return the status of the button: * 0 (true) - pressed, on * 1 (false) - not pressed, off The button command takes only one argument. Correct maxargs. Adjust the Python unit test. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>
86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
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*
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* Based on led.c
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <button.h>
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#include <dm/uclass-internal.h>
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static const char *const state_label[] = {
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[BUTTON_OFF] = "off",
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[BUTTON_ON] = "on",
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};
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static int show_button_state(struct udevice *dev)
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{
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int ret;
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ret = button_get_state(dev);
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if (ret >= BUTTON_COUNT)
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ret = -EINVAL;
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if (ret >= 0)
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printf("%s\n", state_label[ret]);
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return ret;
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}
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static int list_buttons(void)
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{
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struct udevice *dev;
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int ret;
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for (uclass_find_first_device(UCLASS_BUTTON, &dev);
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dev;
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uclass_find_next_device(&dev)) {
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struct button_uc_plat *plat = dev_get_uclass_platdata(dev);
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if (!plat->label)
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continue;
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printf("%-15s ", plat->label);
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if (device_active(dev)) {
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ret = show_button_state(dev);
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if (ret < 0)
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printf("Error %d\n", ret);
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} else {
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printf("<inactive>\n");
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}
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}
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return 0;
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}
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int do_button(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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const char *button_label;
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struct udevice *dev;
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int ret;
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/* Validate arguments */
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if (argc < 2)
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return CMD_RET_USAGE;
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button_label = argv[1];
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if (strncmp(button_label, "list", 4) == 0)
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return list_buttons();
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ret = button_get_by_label(button_label, &dev);
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if (ret) {
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printf("Button '%s' not found (err=%d)\n", button_label, ret);
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return CMD_RET_FAILURE;
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}
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ret = show_button_state(dev);
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return !ret;
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}
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U_BOOT_CMD(
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button, 2, 1, do_button,
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"manage buttons",
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"<button_label> \tGet button state\n"
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"button list\t\tShow a list of buttons"
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);
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