Initial Android Auto External View Systems drivers
Add support for EVS system camera and display drivers.
These build and run but still contain significant placeholder code and
TODO items.
Bug: 32095143
Test: run against evs_test (submitted in future change set)
Change-Id: I9187e888f03248e5cd43293253dc76a71184c02d
diff --git a/evs/1.0/IEvsDisplay.hal b/evs/1.0/IEvsDisplay.hal
new file mode 100644
index 0000000..a473872
--- /dev/null
+++ b/evs/1.0/IEvsDisplay.hal
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+package android.hardware.evs@1.0;
+
+import types;
+
+
+/**
+ * Represents a single camera and is the primary interface for capturing images.
+ */
+interface IEvsDisplay {
+
+ /**
+ * Returns basic information about the EVS display provided by the system.
+ *
+ * See the description of the DisplayDesc structure below for details.
+ */
+ getDisplayInfo() generates (DisplayDesc info);
+
+
+ /**
+ * Clients may set the display state to express their desired state.
+ *
+ * The HAL implementation must gracefully accept a request for any state while in
+ * any other state, although the response may be to defer or ignore the request. The display
+ * is defined to start in the NOT_VISIBLE state upon initialization. The client is
+ * then expected to request the VISIBLE_ON_NEXT_FRAME state, and then begin providing
+ * video. When the display is no longer required, the client is expected to request
+ * the NOT_VISIBLE state after passing the last video frame.
+ * Returns INVALID_ARG if the requested state is not a recognized value.
+ */
+ setDisplayState(DisplayState state) generates (EvsResult result);
+
+
+ /**
+ * This call requests the current state of the display
+ *
+ * The HAL implementation should report the actual current state, which might
+ * transiently differ from the most recently requested state. Note, however, that
+ * the logic responsible for changing display states should generally live above
+ * the device layer, making it undesirable for the HAL implementation to spontaneously
+ * change display states.
+ */
+ getDisplayState() generates (DisplayState state);
+
+
+ /**
+ * This call returns a handle to a frame buffer associated with the display.
+ *
+ * The returned buffer may be locked and written to by software and/or GL. This buffer
+ * must be returned via a call to returnTargetBufferForDisplay() even if the
+ * display is no longer visible.
+ */
+ getTargetBuffer() generates (handle bufferHandle);
+
+
+ /**
+ * This call tells the display that the buffer is ready for display.
+ *
+ * The buffer is no longer valid for use by the client after this call.
+ * There is no maximum time the caller may hold onto the buffer before making this
+ * call. The buffer may be returned at any time and in any DisplayState, but all
+ * buffers are expected to be returned before the IEvsDisplay interface is destroyed.
+ */
+ returnTargetBufferForDisplay(handle bufferHandle) generates (EvsResult result);
+};