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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_TAG "VrManagerService"
     18 
     19 #include <android_runtime/AndroidRuntime.h>
     20 #include <jni.h>
     21 #include <JNIHelp.h>
     22 
     23 #include <utils/Errors.h>
     24 #include <utils/Log.h>
     25 #include <hardware/hardware.h>
     26 #include <hardware/vr.h>
     27 
     28 namespace android {
     29 
     30 static vr_module_t *gVrHardwareModule = NULL;
     31 
     32 
     33 static void init_native(JNIEnv* /* env */, jclass /* clazz */) {
     34     if (gVrHardwareModule != NULL) {
     35         // This call path should never be hit.
     36         ALOGE("%s: May not initialize VR hardware module more than once!", __FUNCTION__);
     37         return;
     38     }
     39 
     40     int err = hw_get_module(VR_HARDWARE_MODULE_ID, (hw_module_t const**)&gVrHardwareModule);
     41     if (err) {
     42         ALOGW("%s: Could not open VR hardware module, error %s (%d).", __FUNCTION__,
     43                 strerror(-err), err);
     44         return;
     45     }
     46 
     47     // Call init method if implemented.
     48     if (gVrHardwareModule->init) {
     49         gVrHardwareModule->init(gVrHardwareModule);
     50     }
     51 }
     52 
     53 static void setVrMode_native(JNIEnv* /* env */, jclass /* clazz */, jboolean enabled) {
     54     if (gVrHardwareModule == NULL) {
     55         // There is no VR hardware module implemented, do nothing.
     56         return;
     57     }
     58 
     59     // Call set_vr_mode method, this must be implemented if the HAL exists.
     60     gVrHardwareModule->set_vr_mode(gVrHardwareModule, static_cast<bool>(enabled));
     61 }
     62 
     63 static const JNINativeMethod method_table[] = {
     64     { "initializeNative", "()V", (void*)init_native },
     65     { "setVrModeNative", "(Z)V", (void*)setVrMode_native },
     66 };
     67 
     68 int register_android_server_vr_VrManagerService(JNIEnv *env)
     69 {
     70     return jniRegisterNativeMethods(env, "com/android/server/vr/VrManagerService",
     71             method_table, NELEM(method_table));
     72 }
     73 
     74 }; // namespace android
     75