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/* Copyright 2016 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.
*/
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "lid_angle.h"
#include "tablet_mode.h"
#include "timer.h"
#define CPRINTS(format, args...) cprints(CC_MOTION_LID, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_MOTION_LID, format, ## args)
/* 1: in tablet mode; 0: notebook mode; -1: uninitialized */
static int tablet_mode = -1;
/* 1: hall sensor is reporting 360 degrees. */
static int hall_sensor_at_360;
/*
* 1: all calls to tablet_set_mode are ignored and tablet_mode if forced to 0
* 0: all calls to tablet_set_mode are honored
*/
static int disabled;
int tablet_get_mode(void)
{
return !!tablet_mode;
}
void tablet_set_mode(int mode)
{
if (tablet_mode == mode)
return;
if (disabled) {
CPRINTS("Tablet mode set while disabled (ignoring)!");
return;
}
if (hall_sensor_at_360 && !mode) {
CPRINTS("Ignoring tablet mode exit while hall sensor active.");
return;
}
tablet_mode = mode;
CPRINTS("tablet mode %sabled", mode ? "en" : "dis");
hook_notify(HOOK_TABLET_MODE_CHANGE);
#ifdef CONFIG_HOSTCMD_EVENTS
/*
* When tablet mode changes, send an event to ACPI to retrieve
* tablet mode value and send an event to the kernel.
*/
host_set_single_event(EC_HOST_EVENT_MODE_CHANGE);
#endif
}
/* This ifdef can be removed once we clean up past projects which do own init */
#ifdef CONFIG_HALL_SENSOR
#ifndef HALL_SENSOR_GPIO_L
#error HALL_SENSOR_GPIO_L must be defined
#endif
static void hall_sensor_interrupt_debounce(void)
{
hall_sensor_at_360 = IS_ENABLED(CONFIG_HALL_SENSOR_CUSTOM)
? board_sensor_at_360()
: !gpio_get_level(HALL_SENSOR_GPIO_L);
/*
* 1. Peripherals are disabled only when lid reaches 360 position (It's
* probably already disabled by motion_sense task). We deliberately do
* not enable peripherals when the lid is leaving 360 position. Instead,
* we let motion sense task enable it once it is reaches laptop zone
* (180 or less).
* 2. Similarly, tablet mode is set here when lid reaches 360
* position. It should already be set by motion lid driver. We
* deliberately do not clear tablet mode when lid is leaving 360
* position(if motion lid driver is used). Instead, we let motion lid
* driver to clear it when lid goes into laptop zone.
*/
if (!IS_ENABLED(CONFIG_LID_ANGLE) || hall_sensor_at_360)
tablet_set_mode(hall_sensor_at_360);
if (IS_ENABLED(CONFIG_LID_ANGLE_UPDATE) && hall_sensor_at_360)
lid_angle_peripheral_enable(0);
}
DECLARE_DEFERRED(hall_sensor_interrupt_debounce);
/* Debounce time for hall sensor interrupt */
#define HALL_SENSOR_DEBOUNCE_US (30 * MSEC)
void hall_sensor_isr(enum gpio_signal signal)
{
hook_call_deferred(&hall_sensor_interrupt_debounce_data,
HALL_SENSOR_DEBOUNCE_US);
}
static void hall_sensor_init(void)
{
/* If this sub-system was disabled before initializing, honor that. */
if (disabled)
return;
gpio_enable_interrupt(HALL_SENSOR_GPIO_L);
/*
* Ensure tablet mode is initialized according to the hardware state
* so that the cached state reflects reality.
*/
hall_sensor_interrupt_debounce();
}
DECLARE_HOOK(HOOK_INIT, hall_sensor_init, HOOK_PRIO_DEFAULT);
void hall_sensor_disable(void)
{
gpio_disable_interrupt(HALL_SENSOR_GPIO_L);
/* Cancel any pending debounce calls */
hook_call_deferred(&hall_sensor_interrupt_debounce_data, -1);
tablet_set_mode(0);
disabled = 1;
}
#endif
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