Fix issue 4604090: notification sound interrupted.

The problem is that the audio HAL fails to acquire the wake lock when playing the notification.
This is because of a change that removed the mediaserver process form the system group for honeycomb.

The fix consists in requesting the wake lock from PowerManagerService when AudioFlinger mixer
wakes up.

A consequence of this change is that audio HALs or pcm drivers do not have to hold wake locks
anymore as in the past.

Change-Id: I4fb3cc84816c9c408ab7fec75886baf801e1ecb5

2 files changed, 86 insertions, 0 deletions

diff --git a/services/powermanager/Android.mk b/services/powermanager/Android.mk
new file mode 100644
index 0000000..d98b2da
--- /dev/null
+++ b/services/powermanager/Android.mk
@@ -0,0 +1,15 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	IPowerManager.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libutils \
+	libbinder
+
+LOCAL_MODULE:= libpowermanager
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/services/powermanager/IPowerManager.cpp b/services/powermanager/IPowerManager.cpp
new file mode 100644
index 0000000..a0f19d4
--- /dev/null
+++ b/services/powermanager/IPowerManager.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+#define LOG_TAG "IPowerManager"
+//#define LOG_NDEBUG 0
+#include <utils/Log.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <binder/Parcel.h>
+
+#include <powermanager/IPowerManager.h>
+
+namespace android {
+
+// must be kept in sync with IPowerManager.aidl
+enum {
+    ACQUIRE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION,
+    RELEASE_WAKE_LOCK = IBinder::FIRST_CALL_TRANSACTION + 4,
+};
+
+class BpPowerManager : public BpInterface<IPowerManager>
+{
+public:
+    BpPowerManager(const sp<IBinder>& impl)
+        : BpInterface<IPowerManager>(impl)
+    {
+    }
+
+    virtual status_t acquireWakeLock(int flags, const sp<IBinder>& lock, const String16& tag)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IPowerManager::getInterfaceDescriptor());
+
+        data.writeInt32(flags);
+        data.writeStrongBinder(lock);
+        data.writeString16(tag);
+        // no WorkSource passed
+        data.writeInt32(0);
+        return remote()->transact(ACQUIRE_WAKE_LOCK, data, &reply);
+    }
+
+    virtual status_t releaseWakeLock(const sp<IBinder>& lock, int flags)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IPowerManager::getInterfaceDescriptor());
+        data.writeStrongBinder(lock);
+        data.writeInt32(flags);
+        return remote()->transact(RELEASE_WAKE_LOCK, data, &reply);
+    }
+};
+
+IMPLEMENT_META_INTERFACE(PowerManager, "android.os.IPowerManager");
+
+// ----------------------------------------------------------------------------
+
+}; // namespace android