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/* Copyright 2014 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.
*/
/* Inductive charging control */
#include "common.h"
#include "gpio.h"
#include "hooks.h"
#include "inductive_charging.h"
#include "lid_switch.h"
#include "timer.h"
/*
* The inductive charger is controlled with two signals:
* - BASE_CHG_VDD_EN controls whether the charger is powered.
* - CHARGE_EN controls whether to enable charging.
* Charging status is reported via CHARGE_DONE, but in a tricky way:
* - It's 0 if:
* + The charger is unpowered. (i.e. BASE_CHG_VDD_EN = 0)
* + Or charging is disabled. (i.e. CHARGE_EN = 0)
* + Or the charging current is small enough.
* - Otherwise, it's 1.
*/
/* Whether we want to process interrupts on CHARGE_DONE or not. */
static int monitor_charge_done;
/*
* Start monitoring CHARGE_DONE and fires the interrupt once so that
* we react to the current value.
*/
static void inductive_charging_monitor_charge(void)
{
monitor_charge_done = 1;
inductive_charging_interrupt(GPIO_CHARGE_DONE);
}
DECLARE_DEFERRED(inductive_charging_monitor_charge);
void inductive_charging_interrupt(enum gpio_signal signal)
{
int charger_enabled = gpio_get_level(GPIO_BASE_CHG_VDD_EN);
int charge_done = gpio_get_level(GPIO_CHARGE_DONE);
static int charge_already_done;
if (!monitor_charge_done && signal == GPIO_CHARGE_DONE)
return;
if (signal == GPIO_LID_OPEN) {
/* The lid has been opened. Clear all states. */
charge_done = 0;
charge_already_done = 0;
monitor_charge_done = 0;
} else if (signal == GPIO_CHARGE_DONE) {
/*
* Once we see CHARGE_DONE=1, we ignore any change on
* CHARGE_DONE until the next time the lid is opened.
*/
if (charge_done == 1)
charge_already_done = 1;
else if (charge_already_done)
return;
}
if (!charger_enabled || charge_done) {
gpio_set_level(GPIO_CHARGE_EN, 0);
} else {
gpio_set_level(GPIO_CHARGE_EN, 1);
/*
* When the charging is just enabled, there might be a
* blip on CHARGE_DONE. Wait for a second before we start
* looking at CHARGE_DONE.
*/
if (!monitor_charge_done)
hook_call_deferred(
&inductive_charging_monitor_charge_data,
SECOND);
}
}
static void inductive_charging_deferred_update(void)
{
int lid_open = lid_is_open();
gpio_set_level(GPIO_BASE_CHG_VDD_EN, !lid_open);
inductive_charging_interrupt(GPIO_LID_OPEN);
}
DECLARE_DEFERRED(inductive_charging_deferred_update);
static void inductive_charging_lid_update(void)
{
/*
* When the lid close signal changes, the coils might still be
* unaligned. Delay here to give the coils time to align before
* we try to clear CHARGE_DONE.
*/
hook_call_deferred(&inductive_charging_deferred_update_data,
5 * SECOND);
}
DECLARE_HOOK(HOOK_LID_CHANGE, inductive_charging_lid_update, HOOK_PRIO_DEFAULT);
static void inductive_charging_init(void)
{
gpio_enable_interrupt(GPIO_CHARGE_DONE);
inductive_charging_lid_update();
}
DECLARE_HOOK(HOOK_INIT, inductive_charging_init, HOOK_PRIO_DEFAULT);
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