Reference Camera v2 HAL Implementation

This is meant to be an example and a reference for device manufacturers
on how to build a new Camera v2 HAL.  This first patch has basic
configuration and entry/exit.

Change-Id: Ib4166e2eadb813228af38ec31a1215940c070bbf
diff --git a/modules/camera/CameraHAL.cpp b/modules/camera/CameraHAL.cpp
new file mode 100644
index 0000000..22c7aef
--- /dev/null
+++ b/modules/camera/CameraHAL.cpp
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2012 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 <cstdlib>
+#include <hardware/camera2.h>
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "CameraHAL"
+#include <cutils/log.h>
+
+#include "Camera.h"
+
+/*
+ * This file serves as the entry point to the HAL.  It contains the module
+ * structure and functions used by the framework to load and interface to this
+ * HAL, as well as the handles to the individual camera devices.
+ */
+
+namespace default_camera_hal {
+
+enum camera_id_t {
+    CAMERA_A,
+    CAMERA_B,
+    NUM_CAMERAS
+};
+
+// Symbol used by the framework when loading the HAL, defined below.
+extern "C" camera_module_t HAL_MODULE_INFO_SYM;
+
+// Camera devices created when the module is loaded. See Camera.h
+static Camera gCameras[NUM_CAMERAS] = {
+    Camera(CAMERA_A, &HAL_MODULE_INFO_SYM.common),
+    Camera(CAMERA_B, &HAL_MODULE_INFO_SYM.common)
+};
+
+extern "C" {
+
+static int get_number_of_cameras()
+{
+    ALOGV("%s", __func__);
+    return NUM_CAMERAS;
+}
+
+static int get_camera_info(int id, struct camera_info* info)
+{
+    ALOGV("%s: camera id %d: info=%p", __func__, id, info);
+    if (id < 0 || id >= NUM_CAMERAS) {
+        ALOGE("%s: Invalid camera id %d", __func__, id);
+        return -ENODEV;
+    }
+    return gCameras[id].getCameraInfo(info);
+}
+
+static int open_device(const hw_module_t* module,
+                       const char* name,
+                       hw_device_t** device)
+{
+    ALOGV("%s: module=%p, name=%s, device=%p", __func__, module, name, device);
+    char *nameEnd;
+    int id;
+
+    id = strtol(name, &nameEnd, 10);
+    if (nameEnd != NULL) {
+        ALOGE("%s: Invalid camera id name %s", __func__, name);
+        return -EINVAL;
+    } else if (id < 0 || id >= NUM_CAMERAS) {
+        ALOGE("%s: Invalid camera id %d", __func__, id);
+        return -ENODEV;
+    }
+    *device = &gCameras[id].mDevice.common;
+    return gCameras[id].open();
+}
+
+static hw_module_methods_t gCameraModuleMethods = {
+    open : open_device
+};
+
+camera_module_t HAL_MODULE_INFO_SYM = {
+    common : {
+        tag                : HARDWARE_MODULE_TAG,
+        module_api_version : CAMERA_MODULE_API_VERSION_2_0,
+        hal_api_version    : HARDWARE_HAL_API_VERSION,
+        id                 : CAMERA_HARDWARE_MODULE_ID,
+        name               : "Reference Camera v2 HAL",
+        author             : "The Android Open Source Project",
+        methods            : &gCameraModuleMethods,
+        dso                : NULL,
+        reserved           : {0},
+    },
+    get_number_of_cameras : get_number_of_cameras,
+    get_camera_info       : get_camera_info
+};
+
+} // extern "C"
+} // namespace default_camera_hal