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 <ScopedUtfChars.h>
25
26#include <limits.h>
27
28#include <android_runtime/AndroidRuntime.h>
29#include <utils/Timers.h>
30#include <utils/misc.h>
31#include <utils/String8.h>
32#include <utils/Log.h>
33#include <hardware/power.h>
34#include <hardware_legacy/power.h>
35#include <cutils/android_reboot.h>
36#include <suspend/autosuspend.h>
37
38#include "com_android_server_power_PowerManagerService.h"
39
40namespace android {
41
42// ----------------------------------------------------------------------------
43
44static struct {
45    jmethodID wakeUpFromNative;
46    jmethodID goToSleepFromNative;
47    jmethodID userActivityFromNative;
48} gPowerManagerServiceClassInfo;
49
50// ----------------------------------------------------------------------------
51
52static jobject gPowerManagerServiceObj;
53static struct power_module* gPowerModule;
54
55static Mutex gPowerManagerLock;
56static bool gScreenOn;
57static bool gScreenBright;
58
59static nsecs_t gLastEventTime[USER_ACTIVITY_EVENT_LAST + 1];
60
61// Throttling interval for user activity calls.
62static const nsecs_t MIN_TIME_BETWEEN_USERACTIVITIES = 500 * 1000000L; // 500ms
63
64// ----------------------------------------------------------------------------
65
66static bool checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
67    if (env->ExceptionCheck()) {
68        ALOGE("An exception was thrown by callback '%s'.", methodName);
69        LOGE_EX(env);
70        env->ExceptionClear();
71        return true;
72    }
73    return false;
74}
75
76bool android_server_PowerManagerService_isScreenOn() {
77    AutoMutex _l(gPowerManagerLock);
78    return gScreenOn;
79}
80
81bool android_server_PowerManagerService_isScreenBright() {
82    AutoMutex _l(gPowerManagerLock);
83    return gScreenBright;
84}
85
86void android_server_PowerManagerService_userActivity(nsecs_t eventTime, int32_t eventType) {
87    // Tell the power HAL when user activity occurs.
88    if (gPowerModule && gPowerModule->powerHint) {
89        gPowerModule->powerHint(gPowerModule, POWER_HINT_INTERACTION, NULL);
90    }
91
92    if (gPowerManagerServiceObj) {
93        // Throttle calls into user activity by event type.
94        // We're a little conservative about argument checking here in case the caller
95        // passes in bad data which could corrupt system state.
96        if (eventType >= 0 && eventType <= USER_ACTIVITY_EVENT_LAST) {
97            nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
98            if (eventTime > now) {
99                eventTime = now;
100            }
101
102            if (gLastEventTime[eventType] + MIN_TIME_BETWEEN_USERACTIVITIES > eventTime) {
103                return;
104            }
105            gLastEventTime[eventType] = eventTime;
106        }
107
108        JNIEnv* env = AndroidRuntime::getJNIEnv();
109
110        env->CallVoidMethod(gPowerManagerServiceObj,
111                gPowerManagerServiceClassInfo.userActivityFromNative,
112                nanoseconds_to_milliseconds(eventTime), eventType, 0);
113        checkAndClearExceptionFromCallback(env, "userActivityFromNative");
114    }
115}
116
117void android_server_PowerManagerService_wakeUp(nsecs_t eventTime) {
118    if (gPowerManagerServiceObj) {
119        JNIEnv* env = AndroidRuntime::getJNIEnv();
120
121        env->CallVoidMethod(gPowerManagerServiceObj,
122                gPowerManagerServiceClassInfo.wakeUpFromNative,
123                nanoseconds_to_milliseconds(eventTime));
124        checkAndClearExceptionFromCallback(env, "wakeUpFromNative");
125    }
126}
127
128void android_server_PowerManagerService_goToSleep(nsecs_t eventTime) {
129    if (gPowerManagerServiceObj) {
130        JNIEnv* env = AndroidRuntime::getJNIEnv();
131
132        env->CallVoidMethod(gPowerManagerServiceObj,
133                gPowerManagerServiceClassInfo.goToSleepFromNative,
134                nanoseconds_to_milliseconds(eventTime), 0);
135        checkAndClearExceptionFromCallback(env, "goToSleepFromNative");
136    }
137}
138
139// ----------------------------------------------------------------------------
140
141static void nativeInit(JNIEnv* env, jobject obj) {
142    gPowerManagerServiceObj = env->NewGlobalRef(obj);
143
144    status_t err = hw_get_module(POWER_HARDWARE_MODULE_ID,
145            (hw_module_t const**)&gPowerModule);
146    if (!err) {
147        gPowerModule->init(gPowerModule);
148    } else {
149        ALOGE("Couldn't load %s module (%s)", POWER_HARDWARE_MODULE_ID, strerror(-err));
150    }
151}
152
153static void nativeSetPowerState(JNIEnv* env,
154        jclass clazz, jboolean screenOn, jboolean screenBright) {
155    AutoMutex _l(gPowerManagerLock);
156    gScreenOn = screenOn;
157    gScreenBright = screenBright;
158}
159
160static void nativeAcquireSuspendBlocker(JNIEnv *env, jclass clazz, jstring nameStr) {
161    ScopedUtfChars name(env, nameStr);
162    acquire_wake_lock(PARTIAL_WAKE_LOCK, name.c_str());
163}
164
165static void nativeReleaseSuspendBlocker(JNIEnv *env, jclass clazz, jstring nameStr) {
166    ScopedUtfChars name(env, nameStr);
167    release_wake_lock(name.c_str());
168}
169
170static void nativeSetInteractive(JNIEnv *env, jclass clazz, jboolean enable) {
171    if (gPowerModule) {
172        if (enable) {
173            ALOGD_IF_SLOW(20, "Excessive delay in setInteractive(true) while turning screen on");
174            gPowerModule->setInteractive(gPowerModule, true);
175        } else {
176            ALOGD_IF_SLOW(20, "Excessive delay in setInteractive(false) while turning screen off");
177            gPowerModule->setInteractive(gPowerModule, false);
178        }
179    }
180}
181
182static void nativeSetAutoSuspend(JNIEnv *env, jclass clazz, jboolean enable) {
183    if (enable) {
184        ALOGD_IF_SLOW(100, "Excessive delay in autosuspend_enable() while turning screen off");
185        autosuspend_enable();
186    } else {
187        ALOGD_IF_SLOW(100, "Excessive delay in autosuspend_disable() while turning screen on");
188        autosuspend_disable();
189    }
190}
191
192static void nativeShutdown(JNIEnv *env, jclass clazz) {
193    android_reboot(ANDROID_RB_POWEROFF, 0, 0);
194}
195
196static void nativeReboot(JNIEnv *env, jclass clazz, jstring reason) {
197    if (reason == NULL) {
198        android_reboot(ANDROID_RB_RESTART, 0, 0);
199    } else {
200        const char *chars = env->GetStringUTFChars(reason, NULL);
201        android_reboot(ANDROID_RB_RESTART2, 0, (char *) chars);
202        env->ReleaseStringUTFChars(reason, chars);  // In case it fails.
203    }
204    jniThrowIOException(env, errno);
205}
206
207
208// ----------------------------------------------------------------------------
209
210static JNINativeMethod gPowerManagerServiceMethods[] = {
211    /* name, signature, funcPtr */
212    { "nativeInit", "()V",
213            (void*) nativeInit },
214    { "nativeSetPowerState", "(ZZ)V",
215            (void*) nativeSetPowerState },
216    { "nativeAcquireSuspendBlocker", "(Ljava/lang/String;)V",
217            (void*) nativeAcquireSuspendBlocker },
218    { "nativeReleaseSuspendBlocker", "(Ljava/lang/String;)V",
219            (void*) nativeReleaseSuspendBlocker },
220    { "nativeSetInteractive", "(Z)V",
221            (void*) nativeSetInteractive },
222    { "nativeSetAutoSuspend", "(Z)V",
223            (void*) nativeSetAutoSuspend },
224    { "nativeShutdown", "()V",
225            (void*) nativeShutdown },
226    { "nativeReboot", "(Ljava/lang/String;)V",
227            (void*) nativeReboot },
228};
229
230#define FIND_CLASS(var, className) \
231        var = env->FindClass(className); \
232        LOG_FATAL_IF(! var, "Unable to find class " className);
233
234#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
235        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
236        LOG_FATAL_IF(! var, "Unable to find method " methodName);
237
238#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
239        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
240        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
241
242int register_android_server_PowerManagerService(JNIEnv* env) {
243    int res = jniRegisterNativeMethods(env, "com/android/server/power/PowerManagerService",
244            gPowerManagerServiceMethods, NELEM(gPowerManagerServiceMethods));
245    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
246
247    // Callbacks
248
249    jclass clazz;
250    FIND_CLASS(clazz, "com/android/server/power/PowerManagerService");
251
252    GET_METHOD_ID(gPowerManagerServiceClassInfo.wakeUpFromNative, clazz,
253            "wakeUpFromNative", "(J)V");
254
255    GET_METHOD_ID(gPowerManagerServiceClassInfo.goToSleepFromNative, clazz,
256            "goToSleepFromNative", "(JI)V");
257
258    GET_METHOD_ID(gPowerManagerServiceClassInfo.userActivityFromNative, clazz,
259            "userActivityFromNative", "(JII)V");
260
261    // Initialize
262    for (int i = 0; i <= USER_ACTIVITY_EVENT_LAST; i++) {
263        gLastEventTime[i] = LLONG_MIN;
264    }
265    gScreenOn = true;
266    gScreenBright = true;
267    gPowerManagerServiceObj = NULL;
268    gPowerModule = NULL;
269    return 0;
270}
271
272} /* namespace android */
273