66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
|
/* 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;
|
||
|
|
hook_notify(HOOK_AC_CHANGE);
|
||
|
|
|
||
|
|
/* Forward notification to host */
|
||
|
|
if (extpower_presence)
|
||
|
|
host_set_single_event(EC_HOST_EVENT_AC_CONNECTED);
|
||
|
|
else
|
||
|
|
host_set_single_event(EC_HOST_EVENT_AC_DISCONNECTED);
|
||
|
|
}
|
||
|
|
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);
|