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, 70 insertions, 0 deletions

diff --git a/include/powermanager/IPowerManager.h b/include/powermanager/IPowerManager.h
new file mode 100644
index 0000000..1723f04
--- /dev/null
+++ b/include/powermanager/IPowerManager.h
@@ -0,0 +1,41 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_IPOWERMANAGER_H
+#define ANDROID_IPOWERMANAGER_H
+
+#include <utils/Errors.h>
+#include <binder/IInterface.h>
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+// must be kept in sync with interface defined in IPowerManager.aidl
+class IPowerManager : public IInterface
+{
+public:
+    DECLARE_META_INTERFACE(PowerManager);
+
+    virtual status_t acquireWakeLock(int flags, const sp<IBinder>& lock, const String16& tag) = 0;
+    virtual status_t releaseWakeLock(const sp<IBinder>& lock, int flags) = 0;
+};
+
+// ----------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_IPOWERMANAGER_H
diff --git a/include/powermanager/PowerManager.h b/include/powermanager/PowerManager.h
new file mode 100644
index 0000000..4590174
--- /dev/null
+++ b/include/powermanager/PowerManager.h
@@ -0,0 +1,29 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_POWERMANAGER_H
+#define ANDROID_POWERMANAGER_H
+
+namespace android {
+
+// must be kept in sync with definitions in PowerManager.java
+enum {
+    POWERMANAGER_PARTIAL_WAKE_LOCK = 1, // equals PowerManager.PARTIAL_WAKE_LOCK constant
+};
+
+}; // namespace android
+
+#endif // ANDROID_POWERMANAGER_H