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      1 /*
      2  * Copyright (C) 2010 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 "PowerManagerService-JNI"
     18 
     19 //#define LOG_NDEBUG 0
     20 
     21 #include "JNIHelp.h"
     22 #include "jni.h"
     23 
     24 #include <limits.h>
     25 
     26 #include <android_runtime/AndroidRuntime.h>
     27 #include <utils/Timers.h>
     28 #include <surfaceflinger/ISurfaceComposer.h>
     29 #include <surfaceflinger/SurfaceComposerClient.h>
     30 
     31 #include "com_android_server_PowerManagerService.h"
     32 
     33 namespace android {
     34 
     35 // ----------------------------------------------------------------------------
     36 
     37 static struct {
     38     jmethodID goToSleep;
     39     jmethodID userActivity;
     40 } gPowerManagerServiceClassInfo;
     41 
     42 // ----------------------------------------------------------------------------
     43 
     44 static jobject gPowerManagerServiceObj;
     45 
     46 static Mutex gPowerManagerLock;
     47 static bool gScreenOn;
     48 static bool gScreenBright;
     49 
     50 static nsecs_t gLastEventTime[POWER_MANAGER_LAST_EVENT + 1];
     51 
     52 // Throttling interval for user activity calls.
     53 static const nsecs_t MIN_TIME_BETWEEN_USERACTIVITIES = 500 * 1000000L; // 500ms
     54 
     55 // ----------------------------------------------------------------------------
     56 
     57 static bool checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
     58     if (env->ExceptionCheck()) {
     59         LOGE("An exception was thrown by callback '%s'.", methodName);
     60         LOGE_EX(env);
     61         env->ExceptionClear();
     62         return true;
     63     }
     64     return false;
     65 }
     66 
     67 bool android_server_PowerManagerService_isScreenOn() {
     68     AutoMutex _l(gPowerManagerLock);
     69     return gScreenOn;
     70 }
     71 
     72 bool android_server_PowerManagerService_isScreenBright() {
     73     AutoMutex _l(gPowerManagerLock);
     74     return gScreenBright;
     75 }
     76 
     77 void android_server_PowerManagerService_userActivity(nsecs_t eventTime, int32_t eventType) {
     78     if (gPowerManagerServiceObj) {
     79         // Throttle calls into user activity by event type.
     80         // We're a little conservative about argument checking here in case the caller
     81         // passes in bad data which could corrupt system state.
     82         if (eventType >= 0 && eventType <= POWER_MANAGER_LAST_EVENT) {
     83             nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
     84             if (eventTime > now) {
     85                 eventTime = now;
     86             }
     87 
     88             if (gLastEventTime[eventType] + MIN_TIME_BETWEEN_USERACTIVITIES > eventTime) {
     89                 return;
     90             }
     91             gLastEventTime[eventType] = eventTime;
     92         }
     93 
     94         JNIEnv* env = AndroidRuntime::getJNIEnv();
     95 
     96         env->CallVoidMethod(gPowerManagerServiceObj, gPowerManagerServiceClassInfo.userActivity,
     97                 nanoseconds_to_milliseconds(eventTime), false, eventType, false);
     98         checkAndClearExceptionFromCallback(env, "userActivity");
     99     }
    100 }
    101 
    102 void android_server_PowerManagerService_goToSleep(nsecs_t eventTime) {
    103     if (gPowerManagerServiceObj) {
    104         JNIEnv* env = AndroidRuntime::getJNIEnv();
    105 
    106         env->CallVoidMethod(gPowerManagerServiceObj, gPowerManagerServiceClassInfo.goToSleep,
    107                 nanoseconds_to_milliseconds(eventTime));
    108         checkAndClearExceptionFromCallback(env, "goToSleep");
    109     }
    110 }
    111 
    112 // ----------------------------------------------------------------------------
    113 
    114 static void android_server_PowerManagerService_nativeInit(JNIEnv* env, jobject obj) {
    115     gPowerManagerServiceObj = env->NewGlobalRef(obj);
    116 }
    117 
    118 static void android_server_PowerManagerService_nativeSetPowerState(JNIEnv* env,
    119         jobject serviceObj, jboolean screenOn, jboolean screenBright) {
    120     AutoMutex _l(gPowerManagerLock);
    121     gScreenOn = screenOn;
    122     gScreenBright = screenBright;
    123 }
    124 
    125 static void android_server_PowerManagerService_nativeStartSurfaceFlingerAnimation(JNIEnv* env,
    126         jobject obj, jint mode) {
    127     sp<ISurfaceComposer> s(ComposerService::getComposerService());
    128     s->turnElectronBeamOff(mode);
    129 }
    130 
    131 // ----------------------------------------------------------------------------
    132 
    133 static JNINativeMethod gPowerManagerServiceMethods[] = {
    134     /* name, signature, funcPtr */
    135     { "nativeInit", "()V",
    136             (void*) android_server_PowerManagerService_nativeInit },
    137     { "nativeSetPowerState", "(ZZ)V",
    138             (void*) android_server_PowerManagerService_nativeSetPowerState },
    139     { "nativeStartSurfaceFlingerAnimation", "(I)V",
    140             (void*) android_server_PowerManagerService_nativeStartSurfaceFlingerAnimation },
    141 };
    142 
    143 #define FIND_CLASS(var, className) \
    144         var = env->FindClass(className); \
    145         LOG_FATAL_IF(! var, "Unable to find class " className);
    146 
    147 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
    148         var = env->GetMethodID(clazz, methodName, methodDescriptor); \
    149         LOG_FATAL_IF(! var, "Unable to find method " methodName);
    150 
    151 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
    152         var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
    153         LOG_FATAL_IF(! var, "Unable to find field " fieldName);
    154 
    155 int register_android_server_PowerManagerService(JNIEnv* env) {
    156     int res = jniRegisterNativeMethods(env, "com/android/server/PowerManagerService",
    157             gPowerManagerServiceMethods, NELEM(gPowerManagerServiceMethods));
    158     LOG_FATAL_IF(res < 0, "Unable to register native methods.");
    159 
    160     // Callbacks
    161 
    162     jclass clazz;
    163     FIND_CLASS(clazz, "com/android/server/PowerManagerService");
    164 
    165     GET_METHOD_ID(gPowerManagerServiceClassInfo.goToSleep, clazz,
    166             "goToSleep", "(J)V");
    167 
    168     GET_METHOD_ID(gPowerManagerServiceClassInfo.userActivity, clazz,
    169             "userActivity", "(JZIZ)V");
    170 
    171     // Initialize
    172     for (int i = 0; i < POWER_MANAGER_LAST_EVENT; i++) {
    173         gLastEventTime[i] = LLONG_MIN;
    174     }
    175     gScreenOn = true;
    176     gScreenBright = true;
    177     return 0;
    178 }
    179 
    180 } /* namespace android */
    181