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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 "task.h"
#include "timer.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SWITCH, outstr)
#define CPRINTS(format, args...) cprints(CC_SWITCH, format, ## args)
/* By default the power button is active low */
#ifndef CONFIG_POWER_BUTTON_ACTIVE_STATE
#define CONFIG_POWER_BUTTON_ACTIVE_STATE 0
#endif
#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;
static volatile int power_button_is_stable = 1;
/**
* Return non-zero if power button signal asserted at hardware input.
*
*/
int power_button_signal_asserted(void)
{
return !!(gpio_get_level(GPIO_POWER_BUTTON_L)
== CONFIG_POWER_BUTTON_ACTIVE_STATE);
}
/**
* 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;
#ifndef CONFIG_POWER_BUTTON_IGNORE_LID
/*
* Always indicate power button released if the lid is closed.
* This prevents waking the system if the device is squashed enough to
* press the power button through the closed lid.
*/
if (!lid_is_open())
return 0;
#endif
return power_button_signal_asserted();
}
int power_button_is_pressed(void)
{
return debounced_power_pressed;
}
/**
* Wait for the power button to be released
*
* @param timeout_us Timeout in microseconds, or -1 to wait forever
* @return EC_SUCCESS if ok, or
* EC_ERROR_TIMEOUT if power button failed to release
*/
int power_button_wait_for_release(int timeout_us)
{
timestamp_t deadline;
timestamp_t now = get_time();
deadline.val = now.val + timeout_us;
while (!power_button_is_stable || power_button_is_pressed()) {
now = get_time();
if (timeout_us < 0) {
task_wait_event(-1);
} else if (timestamp_expired(deadline, &now) ||
(task_wait_event(deadline.val - now.val) ==
TASK_EVENT_TIMER)) {
CPRINTS("power button not released in time");
return EC_ERROR_TIMEOUT;
}
}
CPRINTS("power button released in time");
return EC_SUCCESS;
}
/**
* 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, KB_SCAN_DISABLE_POWER_BUTTON);
/* If power button hasn't changed state, nothing to do */
if (new_pressed == debounced_power_pressed) {
power_button_is_stable = 1;
return;
}
debounced_power_pressed = new_pressed;
power_button_is_stable = 1;
CPRINTS("power button %s", 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, KB_SCAN_DISABLE_POWER_BUTTON);
/* Reset power button debounce time */
power_button_is_stable = 0;
hook_call_deferred(&power_button_change_deferred_data,
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;
power_button_is_stable = 0;
hook_call_deferred(&power_button_change_deferred_data, 0);
msleep(ms);
ccprintf("Simulating power button release.\n");
simulate_power_pressed = 0;
power_button_is_stable = 0;
hook_call_deferred(&power_button_change_deferred_data, 0);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(powerbtn, command_powerbtn,
"[msec]",
"Simulate power button press");
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