mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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242f195771
Added ability to disable the keyboard to wake from suspend when the lid is outside a certain angle range. This has been added to glimmer by defining CONFIG_LID_ANGLE_KEY_SCAN in its board.h. Also modified the lid angle calculation to include a reliability flag which can be used to tell when the hinge aligns too closely with gravity and the lid angle value is unreliable. BUG=none BRANCH=rambi TEST=Tested on a glimmer: In S3, verified that when the lid is open past ~180 deg, the keyboard does not wake the machine. Also verified that if you align hinge with gravity, the keyboard enabled/disabled status remains the same (since we can't actually trust the lid angle value). Change-Id: I45b2c7c3c4bbcae61d3a0f8b5baa461ab8dabfb0 Original-Change-Id: If1a1592d259902d38941936961854b81b3a75b95 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/190061 Reviewed-on: https://chromium-review.googlesource.com/191612 Reviewed-by: Randall Spangler <rspangler@chromium.org>
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* Copyright (c) 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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/* Lid angle module for Chrome EC */
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#include "chipset.h"
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#include "common.h"
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#include "console.h"
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#include "keyboard_scan.h"
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#include "lid_angle.h"
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#include "lid_switch.h"
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#include "motion_sense.h"
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/* Console output macros */
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#define CPUTS(outstr) cputs(CC_LIDANGLE, outstr)
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#define CPRINTF(format, args...) cprintf(CC_LIDANGLE, format, ## args)
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/*
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* Define the number of previous lid angle measurements to keep for determining
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* whether to enable or disable key scanning. Note, that in order to change
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* the state of key scanning, all stored measurements of the lid angle buffer
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* must be in the specified range.
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*/
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#define KEY_SCAN_LID_ANGLE_BUFFER_SIZE 4
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void lidangle_keyscan_update(float lid_ang)
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{
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static float lidangle_buffer[KEY_SCAN_LID_ANGLE_BUFFER_SIZE];
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static int index;
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int i;
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int keys_accept = 1, keys_ignore = 1;
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/* Record most recent lid angle in circular buffer. */
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lidangle_buffer[index] = lid_ang;
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index = (index == KEY_SCAN_LID_ANGLE_BUFFER_SIZE-1) ? 0 : index+1;
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#ifdef CONFIG_LID_SWITCH
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/*
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* If lid is closed, don't need to check if keyboard scanning should
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* be enabled.
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*/
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if (!lid_is_open())
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return;
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#endif
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if (chipset_in_state(CHIPSET_STATE_SUSPEND)) {
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for (i = 0; i < KEY_SCAN_LID_ANGLE_BUFFER_SIZE; i++) {
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/*
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* If any lid angle samples are unreliable, then
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* don't change keyboard scanning state.
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*/
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if (lidangle_buffer[i] == LID_ANGLE_UNRELIABLE)
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return;
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/*
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* Force all elements of the lid angle buffer to be
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* in range of one of the conditions in order to change
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* to the corresponding key scanning state.
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*/
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if (!LID_IN_RANGE_TO_ACCEPT_KEYS(lidangle_buffer[i]))
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keys_accept = 0;
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if (!LID_IN_RANGE_TO_IGNORE_KEYS(lidangle_buffer[i]))
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keys_ignore = 0;
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}
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/* Enable or disable keyboard scanning if necessary. */
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if (keys_accept && !keyboard_scan_is_enabled()) {
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CPRINTF("[%T Enabling keyboard scan, lid ang at %d]\n",
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(int)lidangle_buffer[index]);
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keyboard_scan_enable(1);
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} else if (keys_ignore && !keys_accept &&
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keyboard_scan_is_enabled()) {
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CPRINTF("[%T Disabling keyboard scan, lid ang at %d]\n",
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(int)lidangle_buffer[index]);
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keyboard_scan_enable(0);
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}
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}
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}
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