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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Power button module for Chrome EC */
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "keyboard_scan.h"
#include "lid_switch.h"
#include "power_button.h"
#include "timer.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SWITCH, outstr)
#define CPRINTF(format, args...) cprintf(CC_SWITCH, format, ## args)
#define PWRBTN_DEBOUNCE_US (30 * MSEC) /* Debounce time for power button */
static int debounced_power_pressed; /* Debounced power button state */
static int simulate_power_pressed;
/**
* Get raw power button signal state.
*
* @return 1 if power button is pressed, 0 if not pressed.
*/
static int raw_power_button_pressed(void)
{
if (simulate_power_pressed)
return 1;
/* Ignore power button if lid is closed */
if (!lid_is_open())
return 0;
return gpio_get_level(GPIO_POWER_BUTTON_L) ? 0 : 1;
}
int power_button_is_pressed(void)
{
return debounced_power_pressed;
}
/**
* Handle power button initialization.
*/
static void power_button_init(void)
{
if (raw_power_button_pressed())
debounced_power_pressed = 1;
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_POWER_BUTTON_L);
}
DECLARE_HOOK(HOOK_INIT, power_button_init, HOOK_PRIO_INIT_POWER_BUTTON);
/**
* Handle debounced power button changing state.
*/
static void power_button_change_deferred(void)
{
const int new_pressed = raw_power_button_pressed();
/* Re-enable keyboard scanning if power button is no longer pressed */
if (!new_pressed)
keyboard_scan_enable(1);
/* If power button hasn't changed state, nothing to do */
if (new_pressed == debounced_power_pressed)
return;
debounced_power_pressed = new_pressed;
CPRINTF("[%T power button %s]\n", new_pressed ? "pressed" : "released");
/* Call hooks */
hook_notify(HOOK_POWER_BUTTON_CHANGE);
/* Notify host if power button has been pressed */
if (new_pressed)
host_set_single_event(EC_HOST_EVENT_POWER_BUTTON);
}
DECLARE_DEFERRED(power_button_change_deferred);
void power_button_interrupt(enum gpio_signal signal)
{
/*
* If power button is pressed, disable the matrix scan as soon as
* possible to reduce the risk of false-reboot triggered by those keys
* on the same column with refresh key.
*/
if (raw_power_button_pressed())
keyboard_scan_enable(0);
/* Reset power button debounce time */
hook_call_deferred(power_button_change_deferred, PWRBTN_DEBOUNCE_US);
}
/*****************************************************************************/
/* Console commands */
static int command_powerbtn(int argc, char **argv)
{
int ms = 200; /* Press duration in ms */
char *e;
if (argc > 1) {
ms = strtoi(argv[1], &e, 0);
if (*e)
return EC_ERROR_PARAM1;
}
ccprintf("Simulating %d ms power button press.\n", ms);
simulate_power_pressed = 1;
hook_call_deferred(power_button_change_deferred, 0);
msleep(ms);
ccprintf("Simulating power button release.\n");
simulate_power_pressed = 0;
hook_call_deferred(power_button_change_deferred, 0);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(powerbtn, command_powerbtn,
"[msec]",
"Simulate power button press",
NULL);
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