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