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

1 files changed, 120 insertions, 0 deletions

diff --git a/modules/camera/Camera.cpp b/modules/camera/Camera.cpp
new file mode 100644
index 0000000..24cfe4f
--- /dev/null
+++ b/modules/camera/Camera.cpp
@@ -0,0 +1,120 @@
+/*
+ * 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 <pthread.h>
+
+#define LOG_NDEBUG 0
+#define LOG_TAG "Camera"
+#include <cutils/log.h>
+
+#include "Camera.h"
+
+namespace default_camera_hal {
+
+extern "C" {
+// Shim passed to the framework to close an opened device.
+static int close_device(hw_device_t* dev)
+{
+    camera2_device_t* cam_dev = reinterpret_cast<camera2_device_t*>(dev);
+    Camera* cam = static_cast<Camera*>(cam_dev->priv);
+    return cam->close();
+}
+} // extern "C"
+
+Camera::Camera(int id, const hw_module_t* module)
+    : mId(id),
+      mBusy(false),
+      mMetadata(NULL)
+{
+    pthread_mutex_init(&mMutex,
+                       NULL); // No pthread mutex attributes.
+
+    // TODO: fill in device operations function pointers
+    mDevice.common.tag    = HARDWARE_DEVICE_TAG;
+    mDevice.common.module = const_cast<hw_module_t*>(module);
+    mDevice.common.close  = close_device;
+    mDevice.priv          = this;
+}
+
+Camera::~Camera()
+{
+}
+
+int Camera::open()
+{
+    ALOGV("%s: camera id %d", __func__, mId);
+    pthread_mutex_lock(&mMutex);
+    if (mBusy) {
+        pthread_mutex_unlock(&mMutex);
+        ALOGE("%s:id%d: Error, device already in use.", __func__, mId);
+        return -EBUSY;
+    }
+
+    // TODO: open camera dev nodes, etc
+    mBusy = true;
+
+    pthread_mutex_unlock(&mMutex);
+    return 0;
+}
+
+int Camera::close()
+{
+    ALOGV("%s: camera id %d", __func__, mId);
+    pthread_mutex_lock(&mMutex);
+    if (!mBusy) {
+        pthread_mutex_unlock(&mMutex);
+        ALOGE("%s:id%d: Error, close() on not open device.", __func__, mId);
+        return -EINVAL;
+    }
+
+    // TODO: close camera dev nodes, etc
+    mBusy = false;
+
+    pthread_mutex_unlock(&mMutex);
+    return 0;
+}
+
+int Camera::getCameraInfo(struct camera_info* info)
+{
+    ALOGV("%s: camera id %d: info=%p", __func__, mId, info);
+    init();
+    if (mMetadata == NULL) {
+        ALOGE("%s:id%d: unable to initialize metadata.", __func__, mId);
+        return -ENOENT;
+    }
+
+    // TODO: fill remainder of info struct
+    info->static_camera_characteristics = mMetadata;
+
+    return 0;
+}
+
+void Camera::init()
+{
+    pthread_mutex_lock(&mMutex);
+    if (mMetadata != NULL) {
+        pthread_mutex_unlock(&mMutex);
+        return;
+    }
+
+    // TODO: init metadata, dummy value for now
+    mMetadata = allocate_camera_metadata(1,1);
+
+    pthread_mutex_unlock(&mMutex);
+}
+
+} // namespace default_camera_hal