1 /*
2 * Copyright (C) 2020 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 #include "UinputDevice.h"
18
19 #include <android-base/stringprintf.h>
20
21 namespace android {
22
23 // --- UinputDevice ---
24
UinputDevice(const char * name)25 UinputDevice::UinputDevice(const char* name) : mName(name) {}
26
~UinputDevice()27 UinputDevice::~UinputDevice() {
28 if (ioctl(mDeviceFd, UI_DEV_DESTROY)) {
29 ALOGE("Error while destroying uinput device: %s", strerror(errno));
30 }
31 mDeviceFd.reset();
32 }
33
init()34 void UinputDevice::init() {
35 mDeviceFd = android::base::unique_fd(open("/dev/uinput", O_WRONLY | O_NONBLOCK));
36 if (mDeviceFd < 0) {
37 FAIL() << "Can't open /dev/uinput :" << strerror(errno);
38 }
39
40 struct uinput_user_dev device = {};
41 strlcpy(device.name, mName, UINPUT_MAX_NAME_SIZE);
42 device.id.bustype = BUS_USB;
43 device.id.vendor = 0x01;
44 device.id.product = 0x01;
45 device.id.version = 1;
46
47 ASSERT_NO_FATAL_FAILURE(configureDevice(mDeviceFd, &device));
48
49 if (write(mDeviceFd, &device, sizeof(device)) < 0) {
50 FAIL() << "Could not write uinput_user_dev struct into uinput file descriptor: "
51 << strerror(errno);
52 }
53
54 if (ioctl(mDeviceFd, UI_DEV_CREATE)) {
55 FAIL() << "Error in ioctl : UI_DEV_CREATE: " << strerror(errno);
56 }
57 }
58
injectEvent(uint16_t type,uint16_t code,int32_t value)59 void UinputDevice::injectEvent(uint16_t type, uint16_t code, int32_t value) {
60 struct input_event event = {};
61 event.type = type;
62 event.code = code;
63 event.value = value;
64 event.time = {}; // uinput ignores the timestamp
65
66 if (write(mDeviceFd, &event, sizeof(input_event)) < 0) {
67 std::string msg = base::StringPrintf("Could not write event %" PRIu16 " %" PRIu16
68 " with value %" PRId32 " : %s",
69 type, code, value, strerror(errno));
70 ALOGE("%s", msg.c_str());
71 FAIL() << msg.c_str();
72 }
73 }
74
75 // --- UinputKeyboard ---
76
UinputKeyboard(std::initializer_list<int> keys)77 UinputKeyboard::UinputKeyboard(std::initializer_list<int> keys)
78 : UinputDevice(UinputKeyboard::KEYBOARD_NAME), mKeys(keys.begin(), keys.end()) {}
79
configureDevice(int fd,uinput_user_dev * device)80 void UinputKeyboard::configureDevice(int fd, uinput_user_dev* device) {
81 // enable key press/release event
82 if (ioctl(fd, UI_SET_EVBIT, EV_KEY)) {
83 FAIL() << "Error in ioctl : UI_SET_EVBIT : EV_KEY: " << strerror(errno);
84 }
85
86 // enable set of KEY events
87 std::for_each(mKeys.begin(), mKeys.end(), [fd](int key) {
88 if (ioctl(fd, UI_SET_KEYBIT, key)) {
89 FAIL() << "Error in ioctl : UI_SET_KEYBIT : " << key << " : " << strerror(errno);
90 }
91 });
92
93 // enable synchronization event
94 if (ioctl(fd, UI_SET_EVBIT, EV_SYN)) {
95 FAIL() << "Error in ioctl : UI_SET_EVBIT : EV_SYN: " << strerror(errno);
96 }
97 }
98
pressKey(int key)99 void UinputKeyboard::pressKey(int key) {
100 if (mKeys.find(key) == mKeys.end()) {
101 FAIL() << mName << ": Cannot inject key press: Key not found: " << key;
102 }
103 injectEvent(EV_KEY, key, 1);
104 injectEvent(EV_SYN, SYN_REPORT, 0);
105 }
106
releaseKey(int key)107 void UinputKeyboard::releaseKey(int key) {
108 if (mKeys.find(key) == mKeys.end()) {
109 FAIL() << mName << ": Cannot inject key release: Key not found: " << key;
110 }
111 injectEvent(EV_KEY, key, 0);
112 injectEvent(EV_SYN, SYN_REPORT, 0);
113 }
114
pressAndReleaseKey(int key)115 void UinputKeyboard::pressAndReleaseKey(int key) {
116 pressKey(key);
117 releaseKey(key);
118 }
119
120 // --- UinputHomeKey ---
121
UinputHomeKey()122 UinputHomeKey::UinputHomeKey() : UinputKeyboard({KEY_HOME}) {}
123
pressAndReleaseHomeKey()124 void UinputHomeKey::pressAndReleaseHomeKey() {
125 pressAndReleaseKey(KEY_HOME);
126 }
127
128 // --- UinputSteamController
UinputSteamController()129 UinputSteamController::UinputSteamController() : UinputKeyboard({BTN_GEAR_DOWN, BTN_GEAR_UP}) {}
130
131 // --- UinputTouchScreen ---
UinputTouchScreen(const Rect * size)132 UinputTouchScreen::UinputTouchScreen(const Rect* size)
133 : UinputDevice(UinputTouchScreen::DEVICE_NAME), mSize(*size) {}
134
configureDevice(int fd,uinput_user_dev * device)135 void UinputTouchScreen::configureDevice(int fd, uinput_user_dev* device) {
136 // Setup the touch screen device
137 ioctl(fd, UI_SET_EVBIT, EV_KEY);
138 ioctl(fd, UI_SET_EVBIT, EV_REL);
139 ioctl(fd, UI_SET_EVBIT, EV_ABS);
140 ioctl(fd, UI_SET_ABSBIT, ABS_MT_SLOT);
141 ioctl(fd, UI_SET_ABSBIT, ABS_MT_TOUCH_MAJOR);
142 ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_X);
143 ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_Y);
144 ioctl(fd, UI_SET_ABSBIT, ABS_MT_TRACKING_ID);
145 ioctl(fd, UI_SET_ABSBIT, ABS_MT_TOOL_TYPE);
146 ioctl(fd, UI_SET_PROPBIT, INPUT_PROP_DIRECT);
147 ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
148
149 device->absmin[ABS_MT_SLOT] = RAW_SLOT_MIN;
150 device->absmax[ABS_MT_SLOT] = RAW_SLOT_MAX;
151 device->absmin[ABS_MT_TOUCH_MAJOR] = RAW_TOUCH_MIN;
152 device->absmax[ABS_MT_TOUCH_MAJOR] = RAW_TOUCH_MAX;
153 device->absmin[ABS_MT_POSITION_X] = mSize.left;
154 device->absmax[ABS_MT_POSITION_X] = mSize.right - 1;
155 device->absmin[ABS_MT_POSITION_Y] = mSize.top;
156 device->absmax[ABS_MT_POSITION_Y] = mSize.bottom - 1;
157 device->absmin[ABS_MT_TRACKING_ID] = RAW_ID_MIN;
158 device->absmax[ABS_MT_TRACKING_ID] = RAW_ID_MAX;
159 }
160
sendSlot(int32_t slot)161 void UinputTouchScreen::sendSlot(int32_t slot) {
162 injectEvent(EV_ABS, ABS_MT_SLOT, slot);
163 }
164
sendTrackingId(int32_t trackingId)165 void UinputTouchScreen::sendTrackingId(int32_t trackingId) {
166 injectEvent(EV_ABS, ABS_MT_TRACKING_ID, trackingId);
167 }
168
sendDown(const Point & point)169 void UinputTouchScreen::sendDown(const Point& point) {
170 injectEvent(EV_KEY, BTN_TOUCH, 1);
171 injectEvent(EV_ABS, ABS_MT_POSITION_X, point.x);
172 injectEvent(EV_ABS, ABS_MT_POSITION_Y, point.y);
173 injectEvent(EV_SYN, SYN_REPORT, 0);
174 }
175
sendMove(const Point & point)176 void UinputTouchScreen::sendMove(const Point& point) {
177 injectEvent(EV_ABS, ABS_MT_POSITION_X, point.x);
178 injectEvent(EV_ABS, ABS_MT_POSITION_Y, point.y);
179 injectEvent(EV_SYN, SYN_REPORT, 0);
180 }
181
sendUp()182 void UinputTouchScreen::sendUp() {
183 sendTrackingId(0xffffffff);
184 injectEvent(EV_KEY, BTN_TOUCH, 0);
185 injectEvent(EV_SYN, SYN_REPORT, 0);
186 }
187
sendToolType(int32_t toolType)188 void UinputTouchScreen::sendToolType(int32_t toolType) {
189 injectEvent(EV_ABS, ABS_MT_TOOL_TYPE, toolType);
190 injectEvent(EV_SYN, SYN_REPORT, 0);
191 }
192
193 // Get the center x, y base on the range definition.
getCenterPoint()194 const Point UinputTouchScreen::getCenterPoint() {
195 return Point(mSize.left + mSize.width() / 2, mSize.top + mSize.height() / 2);
196 }
197
198 } // namespace android
199