com_android_server_power_PowerManagerService.cpp revision b696de5c10ebcc7bf42d8487fc0e56e0e937754d 
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 <gui/ISurfaceComposer.h>
28#include <utils/Timers.h>
29#include <utils/misc.h>
30#include <utils/String8.h>
31#include <hardware/power.h>
32#include <hardware_legacy/power.h>
33#include <cutils/android_reboot.h>
34#include <suspend/autosuspend.h>
35
36#include <private/gui/ComposerService.h>
37
38#include "com_android_server_power_PowerManagerService.h"
39
40namespace android {
41
42// ----------------------------------------------------------------------------
43
44static struct {
45    jmethodID goToSleep;
46    jmethodID userActivity;
47} gPowerManagerServiceClassInfo;
48
49// ----------------------------------------------------------------------------
50
51static jobject gPowerManagerServiceObj;
52static struct power_module* gPowerModule;
53
54static Mutex gPowerManagerLock;
55static bool gScreenOn;
56static bool gScreenBright;
57
58static nsecs_t gLastEventTime[USER_ACTIVITY_EVENT_LAST + 1];
59
60// Throttling interval for user activity calls.
61static const nsecs_t MIN_TIME_BETWEEN_USERACTIVITIES = 500 * 1000000L; // 500ms
62
63// ----------------------------------------------------------------------------
64
65static bool checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
66    if (env->ExceptionCheck()) {
67        ALOGE("An exception was thrown by callback '%s'.", methodName);
68        LOGE_EX(env);
69        env->ExceptionClear();
70        return true;
71    }
72    return false;
73}
74
75bool android_server_PowerManagerService_isScreenOn() {
76    AutoMutex _l(gPowerManagerLock);
77    return gScreenOn;
78}
79
80bool android_server_PowerManagerService_isScreenBright() {
81    AutoMutex _l(gPowerManagerLock);
82    return gScreenBright;
83}
84
85void android_server_PowerManagerService_userActivity(nsecs_t eventTime, int32_t eventType) {
86    // Tell the power HAL when user activity occurs.
87    if (gPowerModule && gPowerModule->powerHint) {
88        gPowerModule->powerHint(gPowerModule, POWER_HINT_INTERACTION, NULL);
89    }
90
91    if (gPowerManagerServiceObj) {
92        // Throttle calls into user activity by event type.
93        // We're a little conservative about argument checking here in case the caller
94        // passes in bad data which could corrupt system state.
95        if (eventType >= 0 && eventType <= USER_ACTIVITY_EVENT_LAST) {
96            nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
97            if (eventTime > now) {
98                eventTime = now;
99            }
100
101            if (gLastEventTime[eventType] + MIN_TIME_BETWEEN_USERACTIVITIES > eventTime) {
102                return;
103            }
104            gLastEventTime[eventType] = eventTime;
105        }
106
107        JNIEnv* env = AndroidRuntime::getJNIEnv();
108
109        env->CallVoidMethod(gPowerManagerServiceObj, gPowerManagerServiceClassInfo.userActivity,
110                nanoseconds_to_milliseconds(eventTime), false, eventType, false);
111        checkAndClearExceptionFromCallback(env, "userActivity");
112    }
113}
114
115void android_server_PowerManagerService_goToSleep(nsecs_t eventTime) {
116    if (gPowerManagerServiceObj) {
117        JNIEnv* env = AndroidRuntime::getJNIEnv();
118
119        env->CallVoidMethod(gPowerManagerServiceObj, gPowerManagerServiceClassInfo.goToSleep,
120                nanoseconds_to_milliseconds(eventTime));
121        checkAndClearExceptionFromCallback(env, "goToSleep");
122    }
123}
124
125// ----------------------------------------------------------------------------
126
127static void nativeInit(JNIEnv* env, jobject obj) {
128    gPowerManagerServiceObj = env->NewGlobalRef(obj);
129
130    status_t err = hw_get_module(POWER_HARDWARE_MODULE_ID,
131            (hw_module_t const**)&gPowerModule);
132    if (!err) {
133        gPowerModule->init(gPowerModule);
134    } else {
135        ALOGE("Couldn't load %s module (%s)", POWER_HARDWARE_MODULE_ID, strerror(-err));
136    }
137}
138
139static void nativeSetPowerState(JNIEnv* env,
140        jobject serviceObj, jboolean screenOn, jboolean screenBright) {
141    AutoMutex _l(gPowerManagerLock);
142    gScreenOn = screenOn;
143    gScreenBright = screenBright;
144}
145
146static void nativeStartSurfaceFlingerAnimation(JNIEnv* env,
147        jobject obj, jint mode) {
148    sp<ISurfaceComposer> s(ComposerService::getComposerService());
149    s->turnElectronBeamOff(mode);
150}
151
152static void nativeAcquireWakeLock(JNIEnv *env, jobject clazz, jint lock, jstring idObj) {
153    if (idObj == NULL) {
154        jniThrowNullPointerException(env, "id is null");
155        return;
156    }
157
158    const char *id = env->GetStringUTFChars(idObj, NULL);
159
160    acquire_wake_lock(lock, id);
161
162    env->ReleaseStringUTFChars(idObj, id);
163}
164
165static void nativeReleaseWakeLock(JNIEnv *env, jobject clazz, jstring idObj) {
166    if (idObj == NULL) {
167        jniThrowNullPointerException(env, "id is null");
168        return ;
169    }
170
171    const char *id = env->GetStringUTFChars(idObj, NULL);
172
173    release_wake_lock(id);
174
175    env->ReleaseStringUTFChars(idObj, id);
176
177}
178
179static int nativeSetScreenState(JNIEnv *env, jobject clazz, jboolean on) {
180    sp<ISurfaceComposer> s(ComposerService::getComposerService());
181    if (on) {
182        autosuspend_disable();
183        if (gPowerModule) {
184            gPowerModule->setInteractive(gPowerModule, true);
185        }
186        s->unblank();
187    } else {
188        s->blank();
189        if (gPowerModule) {
190            gPowerModule->setInteractive(gPowerModule, false);
191        }
192        autosuspend_enable();
193    }
194
195    return 0;
196}
197
198static void nativeShutdown(JNIEnv *env, jobject clazz) {
199    android_reboot(ANDROID_RB_POWEROFF, 0, 0);
200}
201
202static void nativeReboot(JNIEnv *env, jobject clazz, jstring reason) {
203    if (reason == NULL) {
204        android_reboot(ANDROID_RB_RESTART, 0, 0);
205    } else {
206        const char *chars = env->GetStringUTFChars(reason, NULL);
207        android_reboot(ANDROID_RB_RESTART2, 0, (char *) chars);
208        env->ReleaseStringUTFChars(reason, chars);  // In case it fails.
209    }
210    jniThrowIOException(env, errno);
211}
212
213
214// ----------------------------------------------------------------------------
215
216static JNINativeMethod gPowerManagerServiceMethods[] = {
217    /* name, signature, funcPtr */
218    { "nativeInit", "()V",
219            (void*) nativeInit },
220    { "nativeSetPowerState", "(ZZ)V",
221            (void*) nativeSetPowerState },
222    { "nativeStartSurfaceFlingerAnimation", "(I)V",
223            (void*) nativeStartSurfaceFlingerAnimation },
224    { "nativeAcquireWakeLock", "(ILjava/lang/String;)V",
225            (void*) nativeAcquireWakeLock },
226    { "nativeReleaseWakeLock", "(Ljava/lang/String;)V",
227            (void*) nativeReleaseWakeLock },
228    { "nativeSetScreenState", "(Z)I",
229            (void*) nativeSetScreenState },
230    { "nativeShutdown", "()V",
231            (void*) nativeShutdown },
232    { "nativeReboot", "(Ljava/lang/String;)V",
233            (void*) nativeReboot },
234};
235
236#define FIND_CLASS(var, className) \
237        var = env->FindClass(className); \
238        LOG_FATAL_IF(! var, "Unable to find class " className);
239
240#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
241        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
242        LOG_FATAL_IF(! var, "Unable to find method " methodName);
243
244#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
245        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
246        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
247
248int register_android_server_PowerManagerService(JNIEnv* env) {
249    int res = jniRegisterNativeMethods(env, "com/android/server/power/PowerManagerService",
250            gPowerManagerServiceMethods, NELEM(gPowerManagerServiceMethods));
251    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
252
253    // Callbacks
254
255    jclass clazz;
256    FIND_CLASS(clazz, "com/android/server/power/PowerManagerService");
257
258    GET_METHOD_ID(gPowerManagerServiceClassInfo.goToSleep, clazz,
259            "goToSleep", "(J)V");
260
261    GET_METHOD_ID(gPowerManagerServiceClassInfo.userActivity, clazz,
262            "userActivity", "(JZIZ)V");
263
264    // Initialize
265    for (int i = 0; i <= USER_ACTIVITY_EVENT_LAST; i++) {
266        gLastEventTime[i] = LLONG_MIN;
267    }
268    gScreenOn = true;
269    gScreenBright = true;
270    gPowerManagerServiceObj = NULL;
271    gPowerModule = NULL;
272    return 0;
273}
274
275} /* namespace android */
276