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Add "uinput" command to support uinput device.

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Add support of uinput device with "uinput" shell command, allows user to
create a virtual uinput device and inject events to it, for input
framework testing.

Bug: 160360195
Bug: 163217897

Test: run uinput command from adb shell.
Change-Id: Ic885ae510d98fa282722f7a17d66778c15a893b6
This commit is contained in:
Chris Ye
2020-08-07 09:15:19 -07:00
parent 6fd5ba3a44
commit 3c5b809387
13 changed files with 1677 additions and 0 deletions
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1
PREUPLOAD.cfg
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@@ -6,6 +6,7 @@ clang_format = true
clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
cmds/hid/
cmds/input/
cmds/uinput/
core/jni/
libs/input/
services/core/jni/

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cmds/uinput/Android.bp Normal file
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// Copyright 2020 The Android Open Source Project
//
java_binary {
name: "uinput",
wrapper: "uinput",
srcs: ["**/*.java",
":uinputcommand_aidl"
],
required: ["libuinputcommand_jni"],
}
filegroup {
name: "uinputcommand_aidl",
srcs: [
"src/com/android/commands/uinput/InputAbsInfo.aidl",
],
}

0
cmds/uinput/MODULE_LICENSE_APACHE2 Normal file
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190
cmds/uinput/NOTICE Normal file
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
Unless required by applicable law or agreed to in writing, software
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cmds/uinput/README.md Normal file
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# Usage
## Two options to use the uinput command:
### 1. Interactive through stdin:
type `uinput -` into the terminal, then type/paste commands to send to the binary.
Use Ctrl+D to signal end of stream to the binary (EOF).
This mode can be also used from an app to send uinput events.
For an example, see the cts test case at: [InputTestCase.java][2]
When using another program to control uinput in interactive mode, registering a
new input device (for example, a bluetooth joystick) should be the first step.
After the device is added, you need to wait for the _onInputDeviceAdded_
(see [InputDeviceListener][1]) notification before issuing commands
to the device.
Failure to do so will cause missed events and inconsistent behavior.
### 2. Using a file as an input:
type `uinput <filename>`, and the file will be used an an input to the binary.
You must add a sufficient delay after a "register" command to ensure device
is ready. The interactive mode is the recommended method of communicating
with the uinput binary.
All of the input commands should be in pseudo-JSON format as documented below.
See examples [here][3].
The file can have multiple commands one after the other (which is not strictly
legal JSON format, as this would imply multiple root elements).
## Command description
1. `register`
Register a new uinput device
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| id | integer | Device id |
| command | string | Must be set to "register" |
| name | string | Device name |
| vid | 16-bit integer| Vendor id |
| pid | 16-bit integer| Product id |
| bus | string | Bus that device should use |
| configuration | int array | uinput device configuration|
| ff_effects_max| integer | ff_effects_max value |
| abs_info | array | ABS axes information |
Device ID is used for matching the subsequent commands to a specific device
to avoid ambiguity when multiple devices are registered.
Device bus is used to determine how the uinput device is connected to the host.
The options are "usb" and "bluetooth".
Device configuration is used to configure uinput device. "type" field provides the UI_SET_*
control code, and data is a vector of control values to be sent to uinput device, depends on
the control code.
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| type | integer | UI_SET_ control type |
| data | int array | control values |
Device ff_effects_max must be provided if FFBIT is set.
Device abs_info fields are provided to set the device axes information. It is an array of below
objects:
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| code | integer | Axis code |
| info | object | ABS information object |
ABS information object is defined as below:
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| value | integer | Latest reported value |
| minimum | integer | Minimum value for the axis |
| maximum | integer | Maximum value for the axis |
| fuzz | integer | fuzz value for noise filter|
| flat | integer | values to be discarded |
| resolution | integer | resolution of axis |
See [struct input_absinfo][4]) definitions.
Example:
```json
{
"id": 1,
"command": "register",
"name": "Keyboard (Test)",
"vid": 0x18d2,
"pid": 0x2c42,
"bus": "usb",
"configuration":[
{"type":100, "data":[1, 21]}, // UI_SET_EVBIT : EV_KEY and EV_FF
{"type":101, "data":[11, 2, 3, 4]}, // UI_SET_KEYBIT : KEY_0 KEY_1 KEY_2 KEY_3
{"type":107, "data":[80]} // UI_SET_FFBIT : FF_RUMBLE
],
"ff_effects_max" : 1,
"abs_info": [
{"code":1, "info": {"value":20, "minimum":-255,
"maximum":255, "fuzz":0, "flat":0, "resolution":1}
},
{"code":8, "info": {"value":-50, "minimum":-255,
"maximum":255, "fuzz":0, "flat":0, "resolution":1}
}
]
}
```
2. `delay`
Add a delay to command processing
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| id | integer | Device id |
| command | string | Must be set to "delay" |
| duration | integer | Delay in milliseconds |
Example:
```json
{
"id": 1,
"command": "delay",
"duration": 10
}
```
3. `inject`
Send an array of uinput event packets [type, code, value] to the uinput device
| Field | Type | Description |
|:-------------:|:-------------:|:-------------------------- |
| id | integer | Device id |
| command | string | Must be set to "inject" |
| events | integer array | events to inject |
The "events" parameter is an array of integers, encapsulates evdev input_event type, code and value,
see the example below.
Example:
```json
{
"id": 1,
"command": "inject",
"events": [0x01, 0xb, 0x1, // EV_KEY, KEY_0, DOWN
0x00, 0x00, 0x00, // EV_SYN, SYN_REPORT, 0
0x01, 0x0b, 0x00, // EV_KEY, KEY_0, UP
0x00, 0x00, 0x00, // EV_SYN, SYN_REPORT, 0
0x01, 0x2, 0x1, // EV_KEY, KEY_1, DOWN
0x00, 0x00, 0x01, // EV_SYN, SYN_REPORT, 0
0x01, 0x02, 0x00, // EV_KEY, KEY_1, UP
0x00, 0x00, 0x01 // EV_SYN, SYN_REPORT, 0
]
}
```
### Notes
1. As soon as EOF is reached (either in interactive mode, or in file mode),
the device that was created will be unregistered. There is no
explicit command for unregistering a device.
2. The `getevent` utility can used to print out the key events
for debugging purposes.
[1]: https://developer.android.com/reference/android/hardware/input/InputManager.InputDeviceListener.html
[2]: ../../../../cts/tests/tests/hardware/src/android/hardware/input/cts/tests/InputTestCase.java
[3]: ../../../../cts/tests/tests/hardware/res/raw/
[4]: ../../../../bionic/libc/kernel/uapi/linux/input.h

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cc_library_shared {
name: "libuinputcommand_jni",
srcs: [
"com_android_commands_uinput_Device.cpp",
":uinputcommand_aidl",
],
shared_libs: [
"libandroid",
"libandroid_runtime_lazy",
"libbase",
"libbinder",
"liblog",
"libnativehelper",
],
cflags: [
"-Wall",
"-Wextra",
"-Werror",
],
}

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cmds/uinput/jni/com_android_commands_uinput_Device.cpp Normal file
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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "UinputCommandDevice"
#include <linux/uinput.h>
#include <fcntl.h>
#include <inttypes.h>
#include <time.h>
#include <unistd.h>
#include <algorithm>
#include <array>
#include <cstdio>
#include <cstring>
#include <iterator>
#include <memory>
#include <vector>
#include <android/looper.h>
#include <android_os_Parcel.h>
#include <jni.h>
#include <log/log.h>
#include <nativehelper/JNIHelp.h>
#include <nativehelper/ScopedLocalRef.h>
#include <nativehelper/ScopedPrimitiveArray.h>
#include <nativehelper/ScopedUtfChars.h>
#include <android-base/stringprintf.h>
#include "com_android_commands_uinput_Device.h"
namespace android {
namespace uinput {
using src::com::android::commands::uinput::InputAbsInfo;
static constexpr const char* UINPUT_PATH = "/dev/uinput";
static struct {
jmethodID onDeviceConfigure;
jmethodID onDeviceVibrating;
jmethodID onDeviceError;
} gDeviceCallbackClassInfo;
static void checkAndClearException(JNIEnv* env, const char* methodName) {
if (env->ExceptionCheck()) {
ALOGE("An exception was thrown by callback '%s'.", methodName);
env->ExceptionClear();
}
}
DeviceCallback::DeviceCallback(JNIEnv* env, jobject callback)
: mCallbackObject(env->NewGlobalRef(callback)) {
env->GetJavaVM(&mJavaVM);
}
DeviceCallback::~DeviceCallback() {
JNIEnv* env = getJNIEnv();
env->DeleteGlobalRef(mCallbackObject);
}
void DeviceCallback::onDeviceError() {
JNIEnv* env = getJNIEnv();
env->CallVoidMethod(mCallbackObject, gDeviceCallbackClassInfo.onDeviceError);
checkAndClearException(env, "onDeviceError");
}
void DeviceCallback::onDeviceConfigure(int handle) {
JNIEnv* env = getJNIEnv();
env->CallVoidMethod(mCallbackObject, gDeviceCallbackClassInfo.onDeviceConfigure, handle);
checkAndClearException(env, "onDeviceConfigure");
}
void DeviceCallback::onDeviceVibrating(int value) {
JNIEnv* env = getJNIEnv();
env->CallVoidMethod(mCallbackObject, gDeviceCallbackClassInfo.onDeviceVibrating, value);
checkAndClearException(env, "onDeviceVibrating");
}
JNIEnv* DeviceCallback::getJNIEnv() {
JNIEnv* env;
mJavaVM->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6);
return env;
}
std::unique_ptr<UinputDevice> UinputDevice::open(int32_t id, const char* name, int32_t vid,
int32_t pid, uint16_t bus, uint32_t ffEffectsMax,
std::unique_ptr<DeviceCallback> callback) {
android::base::unique_fd fd(::open(UINPUT_PATH, O_RDWR | O_NONBLOCK | O_CLOEXEC));
if (!fd.ok()) {
ALOGE("Failed to open uinput: %s", strerror(errno));
return nullptr;
}
int32_t version;
::ioctl(fd, UI_GET_VERSION, &version);
if (version < 5) {
ALOGE("Kernel version %d older than 5 is not supported", version);
return nullptr;
}
struct uinput_setup setupDescriptor;
memset(&setupDescriptor, 0, sizeof(setupDescriptor));
strlcpy(setupDescriptor.name, name, UINPUT_MAX_NAME_SIZE);
setupDescriptor.id.version = 1;
setupDescriptor.id.bustype = bus;
setupDescriptor.id.vendor = vid;
setupDescriptor.id.product = pid;
setupDescriptor.ff_effects_max = ffEffectsMax;
// Request device configuration.
callback->onDeviceConfigure(fd.get());
// register the input device
if (::ioctl(fd, UI_DEV_SETUP, &setupDescriptor)) {
ALOGE("UI_DEV_SETUP ioctl failed on fd %d: %s.", fd.get(), strerror(errno));
return nullptr;
}
if (::ioctl(fd, UI_DEV_CREATE) != 0) {
ALOGE("Unable to create uinput device: %s.", strerror(errno));
return nullptr;
}
// using 'new' to access non-public constructor
return std::unique_ptr<UinputDevice>(new UinputDevice(id, std::move(fd), std::move(callback)));
}
UinputDevice::UinputDevice(int32_t id, android::base::unique_fd fd,
std::unique_ptr<DeviceCallback> callback)
: mId(id), mFd(std::move(fd)), mDeviceCallback(std::move(callback)) {
ALooper* aLooper = ALooper_forThread();
if (aLooper == nullptr) {
ALOGE("Could not get ALooper, ALooper_forThread returned NULL");
aLooper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
}
ALooper_addFd(
aLooper, mFd, 0, ALOOPER_EVENT_INPUT,
[](int, int events, void* data) {
UinputDevice* d = reinterpret_cast<UinputDevice*>(data);
return d->handleEvents(events);
},
reinterpret_cast<void*>(this));
ALOGI("uinput device %d created: version = %d, fd = %d", mId, UINPUT_VERSION, mFd.get());
}
UinputDevice::~UinputDevice() {
::ioctl(mFd, UI_DEV_DESTROY);
}
void UinputDevice::injectEvent(uint16_t type, uint16_t code, int32_t value) {
struct input_event event = {};
event.type = type;
event.code = code;
event.value = value;
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
TIMESPEC_TO_TIMEVAL(&event.time, &ts);
if (::write(mFd, &event, sizeof(input_event)) < 0) {
ALOGE("Could not write event %" PRIu16 " %" PRIu16 " with value %" PRId32 " : %s", type,
code, value, strerror(errno));
}
}
int UinputDevice::handleEvents(int events) {
if (events & (ALOOPER_EVENT_ERROR | ALOOPER_EVENT_HANGUP)) {
ALOGE("uinput node was closed or an error occurred. events=0x%x", events);
mDeviceCallback->onDeviceError();
return 0;
}
struct input_event ev;
ssize_t ret = ::read(mFd, &ev, sizeof(ev));
if (ret < 0) {
ALOGE("Failed to read from uinput node: %s", strerror(errno));
mDeviceCallback->onDeviceError();
return 0;
}
switch (ev.type) {
case EV_UINPUT: {
if (ev.code == UI_FF_UPLOAD) {
struct uinput_ff_upload ff_upload;
ff_upload.request_id = ev.value;
::ioctl(mFd, UI_BEGIN_FF_UPLOAD, &ff_upload);
ff_upload.retval = 0;
::ioctl(mFd, UI_END_FF_UPLOAD, &ff_upload);
} else if (ev.code == UI_FF_ERASE) {
struct uinput_ff_erase ff_erase;
ff_erase.request_id = ev.value;
::ioctl(mFd, UI_BEGIN_FF_ERASE, &ff_erase);
ff_erase.retval = 0;
::ioctl(mFd, UI_END_FF_ERASE, &ff_erase);
}
break;
}
case EV_FF: {
ALOGI("EV_FF effect = %d value = %d", ev.code, ev.value);
mDeviceCallback->onDeviceVibrating(ev.value);
break;
}
default: {
ALOGI("Unhandled event type: %" PRIu32, ev.type);
break;
}
}
return 1;
}
} // namespace uinput
std::vector<int32_t> toVector(JNIEnv* env, jintArray javaArray) {
std::vector<int32_t> data;
if (javaArray == nullptr) {
return data;
}
ScopedIntArrayRO scopedArray(env, javaArray);
size_t size = scopedArray.size();
data.reserve(size);
for (size_t i = 0; i < size; i++) {
data.push_back(static_cast<int32_t>(scopedArray[i]));
}
return data;
}
static jlong openUinputDevice(JNIEnv* env, jclass /* clazz */, jstring rawName, jint id, jint vid,
jint pid, jint bus, jint ffEffectsMax, jobject callback) {
ScopedUtfChars name(env, rawName);
if (name.c_str() == nullptr) {
return 0;
}
std::unique_ptr<uinput::DeviceCallback> cb =
std::make_unique<uinput::DeviceCallback>(env, callback);
std::unique_ptr<uinput::UinputDevice> d =
uinput::UinputDevice::open(id, name.c_str(), vid, pid, bus, ffEffectsMax,
std::move(cb));
return reinterpret_cast<jlong>(d.release());
}
static void closeUinputDevice(JNIEnv* /* env */, jclass /* clazz */, jlong ptr) {
uinput::UinputDevice* d = reinterpret_cast<uinput::UinputDevice*>(ptr);
if (d != nullptr) {
delete d;
}
}
static void injectEvent(JNIEnv* /* env */, jclass /* clazz */, jlong ptr, jint type, jint code,
jint value) {
uinput::UinputDevice* d = reinterpret_cast<uinput::UinputDevice*>(ptr);
if (d != nullptr) {
d->injectEvent(static_cast<uint16_t>(type), static_cast<uint16_t>(code),
static_cast<int32_t>(value));
} else {
ALOGE("Could not inject event, Device* is null!");
}
}
static void configure(JNIEnv* env, jclass /* clazz */, jint handle, jint code,
jintArray rawConfigs) {
std::vector<int32_t> configs = toVector(env, rawConfigs);
// Configure uinput device, with user specified code and value.
for (auto& config : configs) {
::ioctl(static_cast<int>(handle), _IOW(UINPUT_IOCTL_BASE, code, int), config);
}
}
static void setAbsInfo(JNIEnv* env, jclass /* clazz */, jint handle, jint axisCode,
jobject infoObj) {
Parcel* parcel = parcelForJavaObject(env, infoObj);
uinput::InputAbsInfo info;
info.readFromParcel(parcel);
struct uinput_abs_setup absSetup;
absSetup.code = axisCode;
absSetup.absinfo.maximum = info.maximum;
absSetup.absinfo.minimum = info.minimum;
absSetup.absinfo.value = info.value;
absSetup.absinfo.fuzz = info.fuzz;
absSetup.absinfo.flat = info.flat;
absSetup.absinfo.resolution = info.resolution;
::ioctl(static_cast<int>(handle), UI_ABS_SETUP, &absSetup);
}
static JNINativeMethod sMethods[] = {
{"nativeOpenUinputDevice",
"(Ljava/lang/String;IIIII"
"Lcom/android/commands/uinput/Device$DeviceCallback;)J",
reinterpret_cast<void*>(openUinputDevice)},
{"nativeInjectEvent", "(JIII)V", reinterpret_cast<void*>(injectEvent)},
{"nativeConfigure", "(II[I)V", reinterpret_cast<void*>(configure)},
{"nativeSetAbsInfo", "(IILandroid/os/Parcel;)V", reinterpret_cast<void*>(setAbsInfo)},
{"nativeCloseUinputDevice", "(J)V", reinterpret_cast<void*>(closeUinputDevice)},
};
int register_com_android_commands_uinput_Device(JNIEnv* env) {
jclass clazz = env->FindClass("com/android/commands/uinput/Device$DeviceCallback");
if (clazz == nullptr) {
ALOGE("Unable to find class 'DeviceCallback'");
return JNI_ERR;
}
uinput::gDeviceCallbackClassInfo.onDeviceConfigure =
env->GetMethodID(clazz, "onDeviceConfigure", "(I)V");
uinput::gDeviceCallbackClassInfo.onDeviceVibrating =
env->GetMethodID(clazz, "onDeviceVibrating", "(I)V");
uinput::gDeviceCallbackClassInfo.onDeviceError =
env->GetMethodID(clazz, "onDeviceError", "()V");
if (uinput::gDeviceCallbackClassInfo.onDeviceConfigure == nullptr ||
uinput::gDeviceCallbackClassInfo.onDeviceError == nullptr ||
uinput::gDeviceCallbackClassInfo.onDeviceVibrating == nullptr) {
ALOGE("Unable to obtain onDeviceConfigure or onDeviceError or onDeviceVibrating methods");
return JNI_ERR;
}
return jniRegisterNativeMethods(env, "com/android/commands/uinput/Device", sMethods,
NELEM(sMethods));
}
} // namespace android
jint JNI_OnLoad(JavaVM* jvm, void*) {
JNIEnv* env = nullptr;
if (jvm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6)) {
return JNI_ERR;
}
if (android::register_com_android_commands_uinput_Device(env) < 0) {
return JNI_ERR;
}
return JNI_VERSION_1_6;
}

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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <memory>
#include <vector>
#include <jni.h>
#include <linux/input.h>
#include <android-base/unique_fd.h>
#include "src/com/android/commands/uinput/InputAbsInfo.h"
namespace android {
namespace uinput {
class DeviceCallback {
public:
DeviceCallback(JNIEnv* env, jobject callback);
~DeviceCallback();
void onDeviceOpen();
void onDeviceGetReport(uint32_t requestId, uint8_t reportId);
void onDeviceOutput(const std::vector<uint8_t>& data);
void onDeviceConfigure(int handle);
void onDeviceVibrating(int value);
void onDeviceError();
private:
JNIEnv* getJNIEnv();
jobject mCallbackObject;
JavaVM* mJavaVM;
};
class UinputDevice {
public:
static std::unique_ptr<UinputDevice> open(int32_t id, const char* name, int32_t vid,
int32_t pid, uint16_t bus, uint32_t ff_effects_max,
std::unique_ptr<DeviceCallback> callback);
virtual ~UinputDevice();
void injectEvent(uint16_t type, uint16_t code, int32_t value);
int handleEvents(int events);
private:
UinputDevice(int32_t id, android::base::unique_fd fd, std::unique_ptr<DeviceCallback> callback);
int32_t mId;
android::base::unique_fd mFd;
std::unique_ptr<DeviceCallback> mDeviceCallback;
};
} // namespace uinput
} // namespace android

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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.commands.uinput;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.os.Parcel;
import android.os.SystemClock;
import android.util.Log;
import android.util.SparseArray;
import com.android.internal.os.SomeArgs;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.io.OutputStream;
import src.com.android.commands.uinput.InputAbsInfo;
/**
* Device class defines uinput device interfaces of device operations, for device open, close,
* configuration, events injection.
*/
public class Device {
private static final String TAG = "UinputDevice";
private static final int MSG_OPEN_UINPUT_DEVICE = 1;
private static final int MSG_CLOSE_UINPUT_DEVICE = 2;
private static final int MSG_INJECT_EVENT = 3;
private final int mId;
private final HandlerThread mThread;
private final DeviceHandler mHandler;
// mConfiguration is sparse array of ioctl code and array of values.
private final SparseArray<int[]> mConfiguration;
private final SparseArray<InputAbsInfo> mAbsInfo;
private final OutputStream mOutputStream;
private final Object mCond = new Object();
private long mTimeToSend;
static {
System.loadLibrary("uinputcommand_jni");
}
private static native long nativeOpenUinputDevice(String name, int id, int vid, int pid,
int bus, int ffEffectsMax, DeviceCallback callback);
private static native void nativeCloseUinputDevice(long ptr);
private static native void nativeInjectEvent(long ptr, int type, int code, int value);
private static native void nativeConfigure(int handle, int code, int[] configs);
private static native void nativeSetAbsInfo(int handle, int axisCode, Parcel axisParcel);
public Device(int id, String name, int vid, int pid, int bus,
SparseArray<int[]> configuration, int ffEffectsMax,
SparseArray<InputAbsInfo> absInfo) {
mId = id;
mThread = new HandlerThread("UinputDeviceHandler");
mThread.start();
mHandler = new DeviceHandler(mThread.getLooper());
mConfiguration = configuration;
mAbsInfo = absInfo;
mOutputStream = System.out;
SomeArgs args = SomeArgs.obtain();
args.argi1 = id;
args.argi2 = vid;
args.argi3 = pid;
args.argi4 = bus;
args.argi5 = ffEffectsMax;
if (name != null) {
args.arg1 = name;
} else {
args.arg1 = id + ":" + vid + ":" + pid;
}
mHandler.obtainMessage(MSG_OPEN_UINPUT_DEVICE, args).sendToTarget();
mTimeToSend = SystemClock.uptimeMillis();
}
/**
* Inject uinput events to device
*
* @param events Array of raw uinput events.
*/
public void injectEvent(int[] events) {
// if two messages are sent at identical time, they will be processed in order received
Message msg = mHandler.obtainMessage(MSG_INJECT_EVENT, events);
mHandler.sendMessageAtTime(msg, mTimeToSend);
}
/**
* Impose a delay to the device for execution.
*
* @param delay Time to delay in unit of milliseconds.
*/
public void addDelay(int delay) {
mTimeToSend = Math.max(SystemClock.uptimeMillis(), mTimeToSend) + delay;
}
/**
* Close an uinput device.
*
*/
public void close() {
Message msg = mHandler.obtainMessage(MSG_CLOSE_UINPUT_DEVICE);
mHandler.sendMessageAtTime(msg, Math.max(SystemClock.uptimeMillis(), mTimeToSend) + 1);
try {
synchronized (mCond) {
mCond.wait();
}
} catch (InterruptedException ignore) {
}
}
private class DeviceHandler extends Handler {
private long mPtr;
private int mBarrierToken;
DeviceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_OPEN_UINPUT_DEVICE:
SomeArgs args = (SomeArgs) msg.obj;
mPtr = nativeOpenUinputDevice((String) args.arg1, args.argi1, args.argi2,
args.argi3, args.argi4, args.argi5,
new DeviceCallback());
break;
case MSG_INJECT_EVENT:
if (mPtr != 0) {
int[] events = (int[]) msg.obj;
for (int pos = 0; pos + 2 < events.length; pos += 3) {
nativeInjectEvent(mPtr, events[pos], events[pos + 1], events[pos + 2]);
}
}
break;
case MSG_CLOSE_UINPUT_DEVICE:
if (mPtr != 0) {
nativeCloseUinputDevice(mPtr);
getLooper().quitSafely();
mPtr = 0;
} else {
Log.e(TAG, "Tried to close already closed device.");
}
Log.i(TAG, "Device closed.");
synchronized (mCond) {
mCond.notify();
}
break;
default:
throw new IllegalArgumentException("Unknown device message");
}
}
public void pauseEvents() {
mBarrierToken = getLooper().myQueue().postSyncBarrier();
}
public void resumeEvents() {
getLooper().myQueue().removeSyncBarrier(mBarrierToken);
mBarrierToken = 0;
}
}
private class DeviceCallback {
public void onDeviceOpen() {
mHandler.resumeEvents();
}
public void onDeviceConfigure(int handle) {
for (int i = 0; i < mConfiguration.size(); i++) {
int key = mConfiguration.keyAt(i);
int[] data = mConfiguration.get(key);
nativeConfigure(handle, key, data);
}
if (mAbsInfo != null) {
for (int i = 0; i < mAbsInfo.size(); i++) {
int key = mAbsInfo.keyAt(i);
InputAbsInfo info = mAbsInfo.get(key);
Parcel parcel = Parcel.obtain();
info.writeToParcel(parcel, 0);
parcel.setDataPosition(0);
nativeSetAbsInfo(handle, key, parcel);
}
}
}
public void onDeviceVibrating(int value) {
JSONObject json = new JSONObject();
try {
json.put("reason", "vibrating");
json.put("id", mId);
json.put("status", value);
} catch (JSONException e) {
throw new RuntimeException("Could not create JSON object ", e);
}
try {
mOutputStream.write(json.toString().getBytes());
mOutputStream.flush();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void onDeviceError() {
Log.e(TAG, "Device error occurred, closing /dev/uinput");
Message msg = mHandler.obtainMessage(MSG_CLOSE_UINPUT_DEVICE);
msg.setAsynchronous(true);
msg.sendToTarget();
}
}
}

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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.commands.uinput;
import android.util.JsonReader;
import android.util.JsonToken;
import android.util.Log;
import android.util.SparseArray;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import src.com.android.commands.uinput.InputAbsInfo;
/**
* An event is a JSON file defined action event to instruct uinput to perform a command like
* device registration or uinput events injection.
*/
public class Event {
private static final String TAG = "UinputEvent";
public static final String COMMAND_REGISTER = "register";
public static final String COMMAND_DELAY = "delay";
public static final String COMMAND_INJECT = "inject";
private static final int ABS_CNT = 64;
// These constants come from "include/uapi/linux/input.h" in the kernel
enum Bus {
USB(0x03), BLUETOOTH(0x05);
private final int mValue;
Bus(int value) {
mValue = value;
}
int getValue() {
return mValue;
}
}
private int mId;
private String mCommand;
private String mName;
private int mVid;
private int mPid;
private Bus mBus;
private int[] mInjections;
private SparseArray<int[]> mConfiguration;
private int mDuration;
private int mFfEffectsMax = 0;
private SparseArray<InputAbsInfo> mAbsInfo;
public int getId() {
return mId;
}
public String getCommand() {
return mCommand;
}
public String getName() {
return mName;
}
public int getVendorId() {
return mVid;
}
public int getProductId() {
return mPid;
}
public int getBus() {
return mBus.getValue();
}
public int[] getInjections() {
return mInjections;
}
public SparseArray<int[]> getConfiguration() {
return mConfiguration;
}
public int getDuration() {
return mDuration;
}
public int getFfEffectsMax() {
return mFfEffectsMax;
}
public SparseArray<InputAbsInfo> getAbsInfo() {
return mAbsInfo;
}
/**
* Convert an event to String.
*/
public String toString() {
return "Event{id=" + mId
+ ", command=" + mCommand
+ ", name=" + mName
+ ", vid=" + mVid
+ ", pid=" + mPid
+ ", bus=" + mBus
+ ", events=" + Arrays.toString(mInjections)
+ ", configuration=" + mConfiguration
+ ", duration=" + mDuration
+ ", ff_effects_max=" + mFfEffectsMax
+ "}";
}
private static class Builder {
private Event mEvent;
Builder() {
mEvent = new Event();
}
public void setId(int id) {
mEvent.mId = id;
}
private void setCommand(String command) {
mEvent.mCommand = command;
}
public void setName(String name) {
mEvent.mName = name;
}
public void setInjections(int[] events) {
mEvent.mInjections = events;
}
public void setConfiguration(SparseArray<int[]> configuration) {
mEvent.mConfiguration = configuration;
}
public void setVid(int vid) {
mEvent.mVid = vid;
}
public void setPid(int pid) {
mEvent.mPid = pid;
}
public void setBus(Bus bus) {
mEvent.mBus = bus;
}
public void setDuration(int duration) {
mEvent.mDuration = duration;
}
public void setFfEffectsMax(int ffEffectsMax) {
mEvent.mFfEffectsMax = ffEffectsMax;
}
public void setAbsInfo(SparseArray<InputAbsInfo> absInfo) {
mEvent.mAbsInfo = absInfo;
}
public Event build() {
if (mEvent.mId == -1) {
throw new IllegalStateException("No event id");
} else if (mEvent.mCommand == null) {
throw new IllegalStateException("Event does not contain a command");
}
if (COMMAND_REGISTER.equals(mEvent.mCommand)) {
if (mEvent.mConfiguration == null) {
throw new IllegalStateException(
"Device registration is missing configuration");
}
} else if (COMMAND_DELAY.equals(mEvent.mCommand)) {
if (mEvent.mDuration <= 0) {
throw new IllegalStateException("Delay has missing or invalid duration");
}
} else if (COMMAND_INJECT.equals(mEvent.mCommand)) {
if (mEvent.mInjections == null) {
throw new IllegalStateException("Inject command is missing injection data");
}
} else {
throw new IllegalStateException("Unknown command " + mEvent.mCommand);
}
return mEvent;
}
}
/**
* A class that parses the JSON event format from an input stream to build device events.
*/
public static class Reader {
private JsonReader mReader;
public Reader(InputStreamReader in) {
mReader = new JsonReader(in);
mReader.setLenient(true);
}
/**
* Get next event entry from JSON file reader.
*/
public Event getNextEvent() throws IOException {
Event e = null;
while (e == null && mReader.peek() != JsonToken.END_DOCUMENT) {
Event.Builder eb = new Event.Builder();
try {
mReader.beginObject();
while (mReader.hasNext()) {
String name = mReader.nextName();
switch (name) {
case "id":
eb.setId(readInt());
break;
case "command":
eb.setCommand(mReader.nextString());
break;
case "name":
eb.setName(mReader.nextString());
break;
case "vid":
eb.setVid(readInt());
break;
case "pid":
eb.setPid(readInt());
break;
case "bus":
eb.setBus(readBus());
break;
case "events":
int[] injections = readIntList().stream()
.mapToInt(Integer::intValue).toArray();
eb.setInjections(injections);
break;
case "configuration":
eb.setConfiguration(readConfiguration());
break;
case "ff_effects_max":
eb.setFfEffectsMax(readInt());
break;
case "abs_info":
eb.setAbsInfo(readAbsInfoArray());
break;
case "duration":
eb.setDuration(readInt());
break;
default:
mReader.skipValue();
}
}
mReader.endObject();
} catch (IllegalStateException ex) {
error("Error reading in object, ignoring.", ex);
consumeRemainingElements();
mReader.endObject();
continue;
}
e = eb.build();
}
return e;
}
private ArrayList<Integer> readIntList() throws IOException {
ArrayList<Integer> data = new ArrayList<Integer>();
try {
mReader.beginArray();
while (mReader.hasNext()) {
data.add(Integer.decode(mReader.nextString()));
}
mReader.endArray();
} catch (IllegalStateException | NumberFormatException e) {
consumeRemainingElements();
mReader.endArray();
throw new IllegalStateException("Encountered malformed data.", e);
}
return data;
}
private byte[] readData() throws IOException {
ArrayList<Integer> data = readIntList();
byte[] rawData = new byte[data.size()];
for (int i = 0; i < data.size(); i++) {
int d = data.get(i);
if ((d & 0xFF) != d) {
throw new IllegalStateException("Invalid data, all values must be byte-sized");
}
rawData[i] = (byte) d;
}
return rawData;
}
private int readInt() throws IOException {
String val = mReader.nextString();
return Integer.decode(val);
}
private Bus readBus() throws IOException {
String val = mReader.nextString();
return Bus.valueOf(val.toUpperCase());
}
private SparseArray<int[]> readConfiguration()
throws IllegalStateException, IOException {
SparseArray<int[]> configuration = new SparseArray<>();
try {
mReader.beginArray();
while (mReader.hasNext()) {
int type = 0;
int[] data = null;
mReader.beginObject();
while (mReader.hasNext()) {
String name = mReader.nextName();
switch (name) {
case "type":
type = readInt();
break;
case "data":
data = readIntList().stream()
.mapToInt(Integer::intValue).toArray();
break;
default:
consumeRemainingElements();
mReader.endObject();
throw new IllegalStateException(
"Invalid key in device configuration: " + name);
}
}
mReader.endObject();
if (data != null) {
configuration.put(type, data);
}
}
mReader.endArray();
} catch (IllegalStateException | NumberFormatException e) {
consumeRemainingElements();
mReader.endArray();
throw new IllegalStateException("Encountered malformed data.", e);
}
return configuration;
}
private InputAbsInfo readAbsInfo() throws IllegalStateException, IOException {
InputAbsInfo absInfo = new InputAbsInfo();
try {
mReader.beginObject();
while (mReader.hasNext()) {
String name = mReader.nextName();
switch (name) {
case "value":
absInfo.value = readInt();
break;
case "minimum":
absInfo.minimum = readInt();
break;
case "maximum":
absInfo.maximum = readInt();
break;
case "fuzz":
absInfo.fuzz = readInt();
break;
case "flat":
absInfo.flat = readInt();
break;
case "resolution":
absInfo.resolution = readInt();
break;
default:
consumeRemainingElements();
mReader.endObject();
throw new IllegalStateException("Invalid key in abs info: " + name);
}
}
mReader.endObject();
} catch (IllegalStateException | NumberFormatException e) {
consumeRemainingElements();
mReader.endObject();
throw new IllegalStateException("Encountered malformed data.", e);
}
return absInfo;
}
private SparseArray<InputAbsInfo> readAbsInfoArray()
throws IllegalStateException, IOException {
SparseArray<InputAbsInfo> infoArray = new SparseArray<>();
try {
mReader.beginArray();
while (mReader.hasNext()) {
int type = 0;
InputAbsInfo absInfo = null;
mReader.beginObject();
while (mReader.hasNext()) {
String name = mReader.nextName();
switch (name) {
case "code":
type = readInt();
break;
case "info":
absInfo = readAbsInfo();
break;
default:
consumeRemainingElements();
mReader.endObject();
throw new IllegalStateException("Invalid key in abs info array: "
+ name);
}
}
mReader.endObject();
if (absInfo != null) {
infoArray.put(type, absInfo);
}
}
mReader.endArray();
} catch (IllegalStateException | NumberFormatException e) {
consumeRemainingElements();
mReader.endArray();
throw new IllegalStateException("Encountered malformed data.", e);
}
return infoArray;
}
private void consumeRemainingElements() throws IOException {
while (mReader.hasNext()) {
mReader.skipValue();
}
}
}
private static void error(String msg, Exception e) {
System.out.println(msg);
Log.e(TAG, msg);
if (e != null) {
Log.e(TAG, Log.getStackTraceString(e));
}
}
}

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cmds/uinput/src/com/android/commands/uinput/InputAbsInfo.aidl Normal file
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/*
**
** Copyright 2020, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
package src.com.android.commands.uinput;
parcelable InputAbsInfo {
int value;
int minimum;
int maximum;
int fuzz;
int flat;
int resolution;
}

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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.commands.uinput;
import android.util.Log;
import android.util.SparseArray;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
/**
* Uinput class encapsulates execution of "uinput" command. It parses the provided input stream
* parameters as JSON file format, extract event entries and perform commands of event entries.
* Uinput device will be created when performing registration command and used to inject events.
*/
public class Uinput {
private static final String TAG = "UINPUT";
private final Event.Reader mReader;
private final SparseArray<Device> mDevices;
private static void usage() {
error("Usage: uinput [FILE]");
}
/**
* Commandline "uinput" binary main entry
*/
public static void main(String[] args) {
if (args.length != 1) {
usage();
System.exit(1);
}
InputStream stream = null;
try {
if (args[0].equals("-")) {
stream = System.in;
} else {
File f = new File(args[0]);
stream = new FileInputStream(f);
}
(new Uinput(stream)).run();
} catch (Exception e) {
error("Uinput injection failed.", e);
System.exit(1);
} finally {
try {
stream.close();
} catch (IOException e) {
}
}
}
private Uinput(InputStream in) {
mDevices = new SparseArray<Device>();
try {
mReader = new Event.Reader(new InputStreamReader(in, "UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
private void run() {
try {
Event e = null;
while ((e = mReader.getNextEvent()) != null) {
process(e);
}
} catch (IOException ex) {
error("Error reading in events.", ex);
}
for (int i = 0; i < mDevices.size(); i++) {
mDevices.valueAt(i).close();
}
}
private void process(Event e) {
final int index = mDevices.indexOfKey(e.getId());
if (index >= 0) {
Device d = mDevices.valueAt(index);
if (Event.COMMAND_DELAY.equals(e.getCommand())) {
d.addDelay(e.getDuration());
} else if (Event.COMMAND_INJECT.equals(e.getCommand())) {
d.injectEvent(e.getInjections());
} else {
if (Event.COMMAND_REGISTER.equals(e.getCommand())) {
error("Device id=" + e.getId() + " is already registered. Ignoring event.");
} else {
error("Unknown command \"" + e.getCommand() + "\". Ignoring event.");
}
}
} else if (Event.COMMAND_REGISTER.equals(e.getCommand())) {
registerDevice(e);
} else {
Log.e(TAG, "Unknown device id specified. Ignoring event.");
}
}
private void registerDevice(Event e) {
if (!Event.COMMAND_REGISTER.equals(e.getCommand())) {
throw new IllegalStateException(
"Tried to send command \"" + e.getCommand() + "\" to an unregistered device!");
}
int id = e.getId();
Device d = new Device(id, e.getName(), e.getVendorId(), e.getProductId(), e.getBus(),
e.getConfiguration(), e.getFfEffectsMax(), e.getAbsInfo());
mDevices.append(id, d);
}
private static void error(String msg) {
error(msg, null);
}
private static void error(String msg, Exception e) {
Log.e(TAG, msg);
if (e != null) {
Log.e(TAG, Log.getStackTraceString(e));
}
}
}

9
cmds/uinput/uinput Executable file
View File

@@ -0,0 +1,9 @@
#!/system/bin/sh
# Preload the native portion libuinputcommand_jni.so to bypass the dependency
# checks in the Java classloader, which prohibit dependencies that aren't
# listed in system/core/rootdir/etc/public.libraries.android.txt.
export LD_PRELOAD=libuinputcommand_jni.so
export CLASSPATH=/system/framework/uinput.jar
exec app_process /system/bin com.android.commands.uinput.Uinput "$@"