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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.
*/
/* External power detection for daisy/snow/pit */
#include "common.h"
#include "extpower.h"
#include "gpio.h"
#include "pmu_tpschrome.h"
#include "task.h"
int extpower_is_present(void)
{
/*
* Detect AC state using combined gpio pins
*
* On daisy and snow, there's no single gpio signal to detect AC.
* GPIO_AC_PWRBTN_L provides AC on and PWRBTN release.
* GPIO_KB_PWR_ON_L provides PWRBTN release.
*
* When AC plugged, both GPIOs will be high.
*
* One drawback of this detection is, when press-and-hold power
* button. AC state will be unknown. This function will fallback
* to PMU VACG.
*/
int ac_good = 1, battery_good;
if (gpio_get_level(GPIO_KB_PWR_ON_L))
return gpio_get_level(GPIO_AC_PWRBTN_L);
/* Check PMU VACG */
if (!in_interrupt_context())
pmu_get_power_source(&ac_good, &battery_good);
/*
* Charging task only interacts with AP in discharging state. So
* return 1 when AC status can not be detected by GPIO or VACG.
*/
return ac_good;
}
/* TODO: host events and hook notifications */
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