cameraservice: Implement HAL1 and higher HAL API coexistence

A higher hal version device like HAL3.2 can be opened as HAL1.0 device
if HAL supports it. This only applies to camera API1.

Change-Id: I4ae9f59f4317158cc1bd7ed7726e4032cdd1fa07

2 files changed, 70 insertions, 0 deletions

diff --git a/camera/Camera.cpp b/camera/Camera.cpp
index 22199fa..85f44f0 100644
--- a/camera/Camera.cpp
+++ b/camera/Camera.cpp
@@ -77,6 +77,32 @@ sp<Camera> Camera::connect(int cameraId, const String16& clientPackageName,
     return CameraBaseT::connect(cameraId, clientPackageName, clientUid);
 }
 
+status_t Camera::connectLegacy(int cameraId, int halVersion,
+        const String16& clientPackageName,
+        int clientUid,
+        sp<Camera>& camera)
+{
+    ALOGV("%s: connect legacy camera device", __FUNCTION__);
+    sp<Camera> c = new Camera(cameraId);
+    sp<ICameraClient> cl = c;
+    status_t status = NO_ERROR;
+    const sp<ICameraService>& cs = CameraBaseT::getCameraService();
+
+    if (cs != 0) {
+        status = cs.get()->connectLegacy(cl, cameraId, halVersion, clientPackageName,
+                                        clientUid, /*out*/c->mCamera);
+    }
+    if (status == OK && c->mCamera != 0) {
+        c->mCamera->asBinder()->linkToDeath(c);
+        c->mStatus = NO_ERROR;
+        camera = c;
+    } else {
+        ALOGW("An error occurred while connecting to camera: %d", cameraId);
+        c.clear();
+    }
+    return status;
+}
+
 status_t Camera::reconnect()
 {
     ALOGV("reconnect");
diff --git a/camera/ICameraService.cpp b/camera/ICameraService.cpp
index 79c33f9..5485205 100644
--- a/camera/ICameraService.cpp
+++ b/camera/ICameraService.cpp
@@ -186,6 +186,29 @@ public:
         return status;
     }
 
+    // connect to camera service (android.hardware.Camera)
+    virtual status_t connectLegacy(const sp<ICameraClient>& cameraClient, int cameraId,
+                             int halVersion,
+                             const String16 &clientPackageName, int clientUid,
+                             /*out*/sp<ICamera>& device)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(ICameraService::getInterfaceDescriptor());
+        data.writeStrongBinder(cameraClient->asBinder());
+        data.writeInt32(cameraId);
+        data.writeInt32(halVersion);
+        data.writeString16(clientPackageName);
+        data.writeInt32(clientUid);
+        remote()->transact(BnCameraService::CONNECT_LEGACY, data, &reply);
+
+        if (readExceptionCode(reply)) return -EPROTO;
+        status_t status = reply.readInt32();
+        if (reply.readInt32() != 0) {
+            device = interface_cast<ICamera>(reply.readStrongBinder());
+        }
+        return status;
+    }
+
     // connect to camera service (pro client)
     virtual status_t connectPro(const sp<IProCameraCallbacks>& cameraCb, int cameraId,
                                 const String16 &clientPackageName, int clientUid,
@@ -446,6 +469,27 @@ status_t BnCameraService::onTransact(
             reply->writeInt32(supportsCameraApi(cameraId, apiVersion));
             return NO_ERROR;
         } break;
+        case CONNECT_LEGACY: {
+            CHECK_INTERFACE(ICameraService, data, reply);
+            sp<ICameraClient> cameraClient =
+                    interface_cast<ICameraClient>(data.readStrongBinder());
+            int32_t cameraId = data.readInt32();
+            int32_t halVersion = data.readInt32();
+            const String16 clientName = data.readString16();
+            int32_t clientUid = data.readInt32();
+            sp<ICamera> camera;
+            status_t status = connectLegacy(cameraClient, cameraId, halVersion,
+                    clientName, clientUid, /*out*/camera);
+            reply->writeNoException();
+            reply->writeInt32(status);
+            if (camera != NULL) {
+                reply->writeInt32(1);
+                reply->writeStrongBinder(camera->asBinder());
+            } else {
+                reply->writeInt32(0);
+            }
+            return NO_ERROR;
+        } break;
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }