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      1 /*
      2  * Copyright (C) 2016 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_NDEBUG 0
     18 #define LOG_TAG "CAR.INPUT"
     19 
     20 #include <string.h>
     21 #include <sys/time.h>
     22 #include <linux/input.h>
     23 #include <jni.h>
     24 #include <JNIHelp.h>
     25 #include <android/keycodes.h>
     26 #include <cutils/log.h>
     27 #include <utils/Errors.h>
     28 
     29 
     30 namespace android {
     31 
     32 static int androidKeyCodeToLinuxKeyCode(int androidKeyCode) {
     33     switch (androidKeyCode) {
     34     case AKEYCODE_VOLUME_UP:
     35         return KEY_VOLUMEUP;
     36     case AKEYCODE_VOLUME_DOWN:
     37         return KEY_VOLUMEDOWN;
     38     case AKEYCODE_CALL:
     39         return KEY_SEND;
     40     case AKEYCODE_ENDCALL:
     41         return KEY_END;
     42     /* TODO add more keys like these:
     43     case AKEYCODE_MEDIA_PLAY_PAUSE:
     44     case AKEYCODE_MEDIA_STOP:
     45     case AKEYCODE_MEDIA_NEXT:
     46     case AKEYCODE_MEDIA_PREVIOUS:*/
     47     case AKEYCODE_VOICE_ASSIST:
     48         return KEY_MICMUTE;
     49     default:
     50         ALOGW("Unmapped android key code %d dropped", androidKeyCode);
     51         return 0;
     52     }
     53 }
     54 
     55 /*
     56  * Class:     com_android_car_CarInputService
     57  * Method:    nativeInjectKeyEvent
     58  * Signature: (IIZ)I
     59  */
     60 static jint com_android_car_CarInputService_nativeInjectKeyEvent
     61   (JNIEnv *env, jobject /*object*/, jint fd, jint keyCode, jboolean down) {
     62     int linuxKeyCode = androidKeyCodeToLinuxKeyCode(keyCode);
     63     if (linuxKeyCode == 0) {
     64         return BAD_VALUE;
     65     }
     66     struct input_event ev[2];
     67     memset(reinterpret_cast<void*>(&ev), 0, sizeof(ev));
     68     struct timeval now;
     69     gettimeofday(&now, NULL);
     70     // kernel driver is not using time now, but set it to be safe.
     71     ev[0].time = now;
     72     ev[0].type = EV_KEY;
     73     ev[0].code = linuxKeyCode;
     74     ev[0].value = (down ? 1 : 0);
     75     // force delivery and flushing
     76     ev[1].time = now;
     77     ev[1].type = EV_SYN;
     78     ev[1].code = SYN_REPORT;
     79     ev[1].value = 0;
     80     ALOGI("injectKeyEvent down %d keyCode %d, value %d", down, ev[0].code, ev[0].value);
     81     int r = write(fd, reinterpret_cast<void*>(&ev), sizeof(ev));
     82     if (r != sizeof(ev)) {
     83         return -EIO;
     84     }
     85     return 0;
     86 }
     87 
     88 static JNINativeMethod gMethods[] = {
     89     { "nativeInjectKeyEvent", "(IIZ)I",
     90             (void*)com_android_car_CarInputService_nativeInjectKeyEvent },
     91 };
     92 
     93 int register_com_android_car_CarInputService(JNIEnv *env) {
     94     return jniRegisterNativeMethods(env, "com/android/car/CarInputService",
     95             gMethods, NELEM(gMethods));
     96 }
     97 
     98 } // namespace android
     99