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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2023 Linaro Ltd.
* Author: Caleb Connolly <caleb.connolly@linaro.org>
*/
#include <button.h>
#include <command.h>
#include <env.h>
#include <log.h>
#include <vsprintf.h>
/* Some sane limit "just in case" */
#define MAX_BTN_CMDS 32
struct button_cmd {
bool pressed;
const char *btn_name;
const char *cmd;
};
/*
* Button commands are set via environment variables, e.g.:
* button_cmd_N_name=Volume Up
* button_cmd_N=fastboot usb 0
*
* This function will retrieve the command for the given button N
* and populate the cmd struct with the command string and pressed
* state of the button.
*
* Returns 1 if a command was found, 0 otherwise.
*/
static int get_button_cmd(int n, struct button_cmd *cmd)
{
const char *cmd_str;
struct udevice *btn = NULL;
char buf[24];
snprintf(buf, sizeof(buf), "button_cmd_%d_name", n);
cmd->btn_name = env_get(buf);
if (!cmd->btn_name)
return 0;
button_get_by_label(cmd->btn_name, &btn);
if (!btn) {
log_err("No button labelled '%s'\n", cmd->btn_name);
return 0;
}
cmd->pressed = button_get_state(btn) == BUTTON_ON;
/* If the button isn't pressed then cmd->cmd will be unused so don't waste
* cycles reading it
*/
if (!cmd->pressed)
return 1;
snprintf(buf, sizeof(buf), "button_cmd_%d", n);
cmd_str = env_get(buf);
if (!cmd_str) {
log_err("No command set for button '%s'\n", cmd->btn_name);
return 0;
}
cmd->cmd = cmd_str;
return 1;
}
void process_button_cmds(void)
{
struct button_cmd cmd = {0};
int i = 0;
while (get_button_cmd(i++, &cmd) && i < MAX_BTN_CMDS) {
if (!cmd.pressed)
continue;
log_info("BTN '%s'> %s\n", cmd.btn_name, cmd.cmd);
run_command(cmd.cmd, CMD_FLAG_ENV);
/* Don't run commands for multiple buttons */
return;
}
}
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