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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.
*/
/* Lid angle module for Chrome EC */
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "hooks.h"
#include "keyboard_scan.h"
#include "lid_angle.h"
#include "lid_switch.h"
#include "math_util.h"
#include "motion_lid.h"
#include "motion_sense.h"
#include "tablet_mode.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_LIDANGLE, outstr)
#define CPRINTS(format, args...) cprints(CC_LIDANGLE, format, ## args)
/*
* Define the number of previous lid angle measurements to keep for determining
* whether to enable or disable peripherals that are only needed for laptop
* mode. These incude keyboard and trackpad. Note, that in order to change the
* enable/disable state of these peripherals, all stored measurements of the
* lid angle buffer must be in the specified range.
*/
#define LID_ANGLE_BUFFER_SIZE 4
/*
* Define two variables to determine if wake source peripherals that are only
* applicable for laptop mode should be enabled or disabled in S3 based on the
* current lid angle. Note, the lid angle is bound to [0, 360]. Here are two
* angles, defined such that we segregate the lid angle space into two regions.
* The first region is the region in which we enable peripherals in S3 and is
* when the lid angle CCW of the small_angle and CW of the large_angle. The
* second region is the region in which we disable peripherals in S3 and is when
* the lid angle is CCW of the large_angle and CW of the small_angle.
*
* Note, the most sensical values are small_angle = 0 and large_angle = 180,
* but, the angle measurement is not perfect, and we know that if the angle is
* near 0 and the lid isn't closed, then the lid must be near 360. So, the
* small_angle is set to a small positive value to make sure we don't swap modes
* when the lid is open all the way but is measuring a small positive value.
*/
static int wake_large_angle = 180;
static const int wake_small_angle = 13;
/* Define hysteresis value to add stability to the flags. */
#define LID_ANGLE_HYSTERESIS_DEG 2
/* Define max and min values for wake_large_angle. */
#define LID_ANGLE_MIN_LARGE_ANGLE 0
#define LID_ANGLE_MAX_LARGE_ANGLE 360
/**
* Determine if given angle is in region to enable peripherals.
*
* @param ang Some lid angle in degrees [0, 360]
*
* @return true/false
*/
static int lid_in_range_to_enable_peripherals(int ang)
{
/*
* If the wake large angle is min or max, then this function should
* return false or true respectively, independent of input angle.
*/
if (wake_large_angle == LID_ANGLE_MIN_LARGE_ANGLE)
return 0;
else if (wake_large_angle == LID_ANGLE_MAX_LARGE_ANGLE)
return 1;
return (ang >= (wake_small_angle + LID_ANGLE_HYSTERESIS_DEG)) &&
(ang <= (wake_large_angle - LID_ANGLE_HYSTERESIS_DEG));
}
/**
* Determine if given angle is in region to ignore peripherals.
*
* @param ang Some lid angle in degrees [0, 360]
*
* @return true/false
*/
static int lid_in_range_to_ignore_peripherals(int ang)
{
/*
* If the wake large angle is min or max, then this function should
* return true or false respectively, independent of input angle.
*/
if (wake_large_angle == LID_ANGLE_MIN_LARGE_ANGLE)
return 1;
else if (wake_large_angle == LID_ANGLE_MAX_LARGE_ANGLE)
return 0;
return (ang <= (wake_small_angle - LID_ANGLE_HYSTERESIS_DEG)) ||
(ang >= (wake_large_angle + LID_ANGLE_HYSTERESIS_DEG));
}
int lid_angle_get_wake_angle(void)
{
return wake_large_angle;
}
void lid_angle_set_wake_angle(int ang)
{
if (ang < LID_ANGLE_MIN_LARGE_ANGLE)
ang = LID_ANGLE_MIN_LARGE_ANGLE;
else if (ang > LID_ANGLE_MAX_LARGE_ANGLE)
ang = LID_ANGLE_MAX_LARGE_ANGLE;
wake_large_angle = ang;
}
void lid_angle_update(int lid_ang)
{
static int lidangle_buffer[LID_ANGLE_BUFFER_SIZE];
static int index;
int i;
int accept = 1, ignore = 1;
/* Record most recent lid angle in circular buffer. */
lidangle_buffer[index] = lid_ang;
index = (index == LID_ANGLE_BUFFER_SIZE-1) ? 0 : index+1;
/*
* Manage whether or not peripherals are enabled based on lid angle
* history.
*/
for (i = 0; i < LID_ANGLE_BUFFER_SIZE; i++) {
/*
* If any lid angle samples are unreliable, then
* don't change peripheral state.
*/
if (lidangle_buffer[i] == LID_ANGLE_UNRELIABLE)
return;
/*
* Force all elements of the lid angle buffer to be
* in range of one of the conditions in order to change
* to the corresponding peripheral state.
*/
if (!lid_in_range_to_enable_peripherals(lidangle_buffer[i]))
accept = 0;
if (!lid_in_range_to_ignore_peripherals(lidangle_buffer[i]))
ignore = 0;
}
/* Enable or disable peripherals as necessary. */
if (accept)
lid_angle_peripheral_enable(1);
else if (ignore && !accept)
lid_angle_peripheral_enable(0);
}
static void enable_peripherals(void)
{
/*
* Make sure lid angle is not disabling peripherals when AP is running.
*/
lid_angle_peripheral_enable(1);
}
DECLARE_HOOK(HOOK_CHIPSET_RESUME, enable_peripherals, HOOK_PRIO_DEFAULT);
#ifdef CONFIG_TABLET_MODE
static void suspend_peripherals(void)
{
/*
* Make sure peripherals are disabled in S3 in tablet mode.
*/
if (tablet_get_mode())
lid_angle_peripheral_enable(0);
}
DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, suspend_peripherals, HOOK_PRIO_DEFAULT);
#endif /* CONFIG_TABLET_MODE */
#ifdef TEST_BUILD
__overridable void lid_angle_peripheral_enable(int enable)
{
}
#else
__overridable void lid_angle_peripheral_enable(int enable)
{
int chipset_in_s0 = chipset_in_state(CHIPSET_STATE_ON);
if (enable) {
keyboard_scan_enable(1, KB_SCAN_DISABLE_LID_ANGLE);
} else {
/*
* Ensure that the chipset is off before disabling the keyboard.
* When the chipset is on, the EC keeps the keyboard enabled and
* the AP decides whether to ignore input devices or not.
*/
if (!chipset_in_s0)
keyboard_scan_enable(0, KB_SCAN_DISABLE_LID_ANGLE);
}
}
#endif /* TEST_BUILD */
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