core/jni/android_os_Power.cpp

/* //device/libs/android_runtime/android_os_Power.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#include "JNIHelp.h"
#include "jni.h"
#include "android_runtime/AndroidRuntime.h"
#include <utils/misc.h>
#include <hardware_legacy/power.h>
#include <sys/reboot.h>

namespace android
{

static void throw_NullPointerException(JNIEnv *env, const char* msg)
{
    jclass clazz;
    clazz = env->FindClass("java/lang/NullPointerException");
    env->ThrowNew(clazz, msg);
}

static void
acquireWakeLock(JNIEnv *env, jobject clazz, jint lock, jstring idObj)
{
    if (idObj == NULL) {
        throw_NullPointerException(env, "id is null");
        return ;
    }

    const char *id = env->GetStringUTFChars(idObj, NULL);

    acquire_wake_lock(lock, id);

    env->ReleaseStringUTFChars(idObj, id);
}

static void
releaseWakeLock(JNIEnv *env, jobject clazz, jstring idObj)
{
    if (idObj == NULL) {
        throw_NullPointerException(env, "id is null");
        return ;
    }

    const char *id = env->GetStringUTFChars(idObj, NULL);

    release_wake_lock(id);

    env->ReleaseStringUTFChars(idObj, id);

}

static int
setLastUserActivityTimeout(JNIEnv *env, jobject clazz, jlong timeMS)
{
    return set_last_user_activity_timeout(timeMS/1000);
}

static int
setScreenState(JNIEnv *env, jobject clazz, jboolean on)
{
    return set_screen_state(on);
}

static void android_os_Power_shutdown(JNIEnv *env, jobject clazz)
{
    sync();
#ifdef HAVE_ANDROID_OS
    reboot(RB_POWER_OFF);
#endif
}

static void android_os_Power_reboot(JNIEnv *env, jobject clazz, jstring reason)
{
    sync();
#ifdef HAVE_ANDROID_OS
    if (reason == NULL) {
        reboot(RB_AUTOBOOT);
    } else {
        const char *chars = env->GetStringUTFChars(reason, NULL);
        __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
                 LINUX_REBOOT_CMD_RESTART2, (char*) chars);
        env->ReleaseStringUTFChars(reason, chars);  // In case it fails.
    }
    jniThrowIOException(env, errno);
#endif
}

static JNINativeMethod method_table[] = {
    { "acquireWakeLock", "(ILjava/lang/String;)V", (void*)acquireWakeLock },
    { "releaseWakeLock", "(Ljava/lang/String;)V", (void*)releaseWakeLock },
    { "setLastUserActivityTimeout", "(J)I", (void*)setLastUserActivityTimeout },
    { "setScreenState", "(Z)I", (void*)setScreenState },
    { "shutdown", "()V", (void*)android_os_Power_shutdown },
    { "rebootNative", "(Ljava/lang/String;)V", (void*)android_os_Power_reboot },
};

int register_android_os_Power(JNIEnv *env)
{
    return AndroidRuntime::registerNativeMethods(
        env, "android/os/Power",
        method_table, NELEM(method_table));
}

};