1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "SwitchInputMapper"
18//#define LOG_NDEBUG 0
19
20#include "SwitchInputMapper.h"
21
22#include <inttypes.h>
23#include <linux/input.h>
24#include <hardware/input.h>
25#include <utils/Log.h>
26
27#include "InputHost.h"
28#include "InputHub.h"
29
30namespace android {
31
32static struct {
33    int32_t scancode;
34    InputUsage usage;
35} codeMap[] = {
36    {SW_LID, INPUT_USAGE_SWITCH_LID},
37    {SW_TABLET_MODE, INPUT_USAGE_SWITCH_UNKNOWN},
38    {SW_HEADPHONE_INSERT, INPUT_USAGE_SWITCH_HEADPHONE_INSERT},
39    {SW_RFKILL_ALL, INPUT_USAGE_SWITCH_UNKNOWN},
40    {SW_MICROPHONE_INSERT, INPUT_USAGE_SWITCH_MICROPHONE_INSERT},
41    {SW_DOCK, INPUT_USAGE_SWITCH_UNKNOWN},
42    {SW_LINEOUT_INSERT, INPUT_USAGE_SWITCH_LINEOUT_INSERT},
43    {SW_JACK_PHYSICAL_INSERT, INPUT_USAGE_SWITCH_UNKNOWN},
44    {SW_VIDEOOUT_INSERT, INPUT_USAGE_SWITCH_UNKNOWN},
45    {SW_CAMERA_LENS_COVER, INPUT_USAGE_SWITCH_CAMERA_LENS_COVER},
46    {SW_KEYPAD_SLIDE, INPUT_USAGE_SWITCH_KEYPAD_SLIDE},
47    {SW_FRONT_PROXIMITY, INPUT_USAGE_SWITCH_UNKNOWN},
48    {SW_ROTATE_LOCK, INPUT_USAGE_SWITCH_UNKNOWN},
49    {SW_LINEIN_INSERT, INPUT_USAGE_SWITCH_UNKNOWN},
50    {0x0e /* unused */, INPUT_USAGE_SWITCH_UNKNOWN},
51    {SW_MAX, INPUT_USAGE_SWITCH_UNKNOWN},
52};
53
54SwitchInputMapper::SwitchInputMapper()
55    : InputMapper() {
56    static_assert(SW_CNT <= 32, "More than 32 switches defined in linux/input.h");
57}
58
59bool SwitchInputMapper::configureInputReport(InputDeviceNode* devNode,
60        InputReportDefinition* report) {
61    InputUsage usages[SW_CNT];
62    int numUsages = 0;
63    for (int32_t i = 0; i < SW_CNT; ++i) {
64        if (devNode->hasSwitch(codeMap[i].scancode)) {
65            usages[numUsages++] = codeMap[i].usage;
66        }
67    }
68    if (numUsages == 0) {
69        ALOGE("SwitchInputMapper found no switches for %s!", devNode->getPath().c_str());
70        return false;
71    }
72    setInputReportDefinition(report);
73    getInputReportDefinition()->addCollection(INPUT_COLLECTION_ID_SWITCH, 1);
74    getInputReportDefinition()->declareUsages(INPUT_COLLECTION_ID_SWITCH, usages, numUsages);
75    return true;
76}
77
78void SwitchInputMapper::process(const InputEvent& event) {
79    switch (event.type) {
80        case EV_SW:
81            processSwitch(event.code, event.value);
82            break;
83        case EV_SYN:
84            if (event.code == SYN_REPORT) {
85                sync(event.when);
86            }
87            break;
88        default:
89            ALOGV("unknown switch event type: %d", event.type);
90    }
91}
92
93void SwitchInputMapper::processSwitch(int32_t switchCode, int32_t switchValue) {
94    ALOGV("processing switch event. code=%" PRId32 ", value=%" PRId32, switchCode, switchValue);
95    if (switchCode >= 0 && switchCode < SW_CNT) {
96        if (switchValue) {
97            mSwitchValues.markBit(switchCode);
98        } else {
99            mSwitchValues.clearBit(switchCode);
100        }
101        mUpdatedSwitchMask.markBit(switchCode);
102    }
103}
104
105void SwitchInputMapper::sync(nsecs_t when) {
106    if (mUpdatedSwitchMask.isEmpty()) {
107        // Clear the values just in case.
108        mSwitchValues.clear();
109        return;
110    }
111
112    while (!mUpdatedSwitchMask.isEmpty()) {
113        auto bit = mUpdatedSwitchMask.firstMarkedBit();
114        getInputReport()->setBoolUsage(INPUT_COLLECTION_ID_SWITCH, codeMap[bit].usage,
115                mSwitchValues.hasBit(bit), 0);
116        mUpdatedSwitchMask.clearBit(bit);
117    }
118    getInputReport()->reportEvent(getDeviceHandle());
119    mUpdatedSwitchMask.clear();
120    mSwitchValues.clear();
121}
122
123}  // namespace android
124