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/* Copyright 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.
*/
/* Pure GPIO-based external power detection */
#include "common.h"
#include "extpower.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "timer.h"
static int debounced_extpower_presence;
int extpower_is_present(void)
{
return debounced_extpower_presence;
}
/**
* Deferred function to handle external power change
*/
static void extpower_deferred(void)
{
int extpower_presence = gpio_get_level(GPIO_AC_PRESENT);
if (extpower_presence == debounced_extpower_presence)
return;
debounced_extpower_presence = extpower_presence;
extpower_handle_update(extpower_presence);
}
DECLARE_DEFERRED(extpower_deferred);
void extpower_interrupt(enum gpio_signal signal)
{
/* Trigger deferred notification of external power change */
hook_call_deferred(&extpower_deferred_data,
CONFIG_EXTPOWER_DEBOUNCE_MS * MSEC);
}
static void extpower_init(void)
{
uint8_t *memmap_batt_flags = host_get_memmap(EC_MEMMAP_BATT_FLAG);
debounced_extpower_presence = gpio_get_level(GPIO_AC_PRESENT);
/* Initialize the memory-mapped AC_PRESENT flag */
if (debounced_extpower_presence)
*memmap_batt_flags |= EC_BATT_FLAG_AC_PRESENT;
else
*memmap_batt_flags &= ~EC_BATT_FLAG_AC_PRESENT;
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_AC_PRESENT);
}
DECLARE_HOOK(HOOK_INIT, extpower_init, HOOK_PRIO_INIT_EXTPOWER);
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