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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.
*/
/*
* Pure GPIO-based external power detection, buffered to PCH.
* Drive high in S5-S0 when AC_PRESENT is high, otherwise drive low.
*/
#include "charger.h"
#include "chipset.h"
#include "common.h"
#include "extpower.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "task.h"
int extpower_is_present(void)
{
return gpio_get_level(GPIO_AC_PRESENT);
}
static void extpower_buffer_to_pch(void)
{
if (chipset_in_state(CHIPSET_STATE_HARD_OFF)) {
/* Drive low in G3 state */
gpio_set_level(GPIO_PCH_ACOK, 0);
} else {
/* Buffer from extpower in S5+ (where 3.3DSW enabled) */
gpio_set_level(GPIO_PCH_ACOK, extpower_is_present());
}
}
DECLARE_HOOK(HOOK_CHIPSET_PRE_INIT, extpower_buffer_to_pch, HOOK_PRIO_DEFAULT);
static void extpower_shutdown(void)
{
/* Drive ACOK buffer to PCH low when shutting down */
gpio_set_level(GPIO_PCH_ACOK, 0);
}
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, extpower_shutdown, HOOK_PRIO_DEFAULT);
void extpower_interrupt(enum gpio_signal signal)
{
extpower_buffer_to_pch();
/* Trigger notification of external power change */
task_wake(TASK_ID_EXTPOWER);
}
static void extpower_init(void)
{
extpower_buffer_to_pch();
/* Enable interrupts, now that we've initialized */
gpio_enable_interrupt(GPIO_AC_PRESENT);
}
DECLARE_HOOK(HOOK_INIT, extpower_init, HOOK_PRIO_DEFAULT);
static void extpower_board_hacks(int extpower)
{
static int extpower_prev;
/*
* Use discharge_on_ac() to workaround hardware backboosting
* charge circuit problems.
*
* When in G3, PP5000 needs to be enabled to accurately sense
* CC voltage when AC is attached. When AC is disconnceted
* it needs to be off to save power.
*/
if (extpower && !extpower_prev) {
charger_discharge_on_ac(0);
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
gpio_set_level(GPIO_PP5000_EN, 1);
} else if (extpower && extpower_prev) {
/* Glitch on AC_PRESENT, attempt to recover from backboost */
charger_discharge_on_ac(1);
charger_discharge_on_ac(0);
} else {
charger_discharge_on_ac(1);
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
gpio_set_level(GPIO_PP5000_EN, 0);
}
extpower_prev = extpower;
}
/**
* Task to handle external power change
*/
void extpower_task(void)
{
int extpower = extpower_is_present();
extpower_board_hacks(extpower);
while (1) {
/* Wait until next extpower interrupt */
task_wait_event(-1);
extpower = extpower_is_present();
/* Various board hacks to run on extpower change */
extpower_board_hacks(extpower);
hook_notify(HOOK_AC_CHANGE);
/* Forward notification to host */
if (extpower)
host_set_single_event(EC_HOST_EVENT_AC_CONNECTED);
else
host_set_single_event(EC_HOST_EVENT_AC_DISCONNECTED);
}
}
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