MTP: Implement support for getting/setting device properties

Added support for the "device friendly name" and "synchonization partner"
properties, which are required by Microsoft.

Change-Id: Ic0443333d75f7d98a2d902a790b9d505a56d4eef
Signed-off-by: Mike Lockwood <lockwood@android.com>

4 files changed, 15 insertions, 7 deletions

diff --git a/media/mtp/MtpDevice.cpp b/media/mtp/MtpDevice.cpp
index bd68f75..fca0142 100644
--- a/media/mtp/MtpDevice.cpp
+++ b/media/mtp/MtpDevice.cpp
@@ -342,7 +342,7 @@ MtpProperty* MtpDevice::getDevicePropDesc(MtpDeviceProperty code) {
     MtpResponseCode ret = readResponse();
     if (ret == MTP_RESPONSE_OK) {
         MtpProperty* property = new MtpProperty;
-        property->read(mData, true);
+        property->read(mData);
         return property;
     }
     return NULL;
diff --git a/media/mtp/MtpProperty.cpp b/media/mtp/MtpProperty.cpp
index 932ad6a..c7a91d6 100644
--- a/media/mtp/MtpProperty.cpp
+++ b/media/mtp/MtpProperty.cpp
@@ -120,7 +120,7 @@ MtpProperty::~MtpProperty() {
     delete[] mEnumValues;
 }
 
-void MtpProperty::read(MtpDataPacket& packet, bool deviceProp) {
+void MtpProperty::read(MtpDataPacket& packet) {
 
     mCode = packet.getUInt16();
     mType = packet.getUInt16();
@@ -141,7 +141,7 @@ void MtpProperty::read(MtpDataPacket& packet, bool deviceProp) {
             break;
         default:
             readValue(packet, mDefaultValue);
-            if (deviceProp)
+            if (isDeviceProperty())
                 readValue(packet, mCurrentValue);
     }
     mGroupCode = packet.getUInt32();
@@ -159,7 +159,6 @@ void MtpProperty::read(MtpDataPacket& packet, bool deviceProp) {
     }
 }
 
-// FIXME - only works for object properties
 void MtpProperty::write(MtpDataPacket& packet) {
     packet.putUInt16(mCode);
     packet.putUInt16(mType);
diff --git a/media/mtp/MtpProperty.h b/media/mtp/MtpProperty.h
index c5b4e28..64cfb93 100644
--- a/media/mtp/MtpProperty.h
+++ b/media/mtp/MtpProperty.h
@@ -65,16 +65,22 @@ public:
 
     inline MtpPropertyCode getPropertyCode() const { return mCode; }
 
-    void                read(MtpDataPacket& packet, bool deviceProp);
+    void                read(MtpDataPacket& packet);
     void                write(MtpDataPacket& packet);
 
     void                print();
 
+    inline bool         isDeviceProperty() const {
+                            return (   ((mCode & 0xF000) == 0x5000)
+                                    || ((mCode & 0xF800) == 0xD000));
+                        }
+
 private:
     void                readValue(MtpDataPacket& packet, MtpPropertyValue& value);
     void                writeValue(MtpDataPacket& packet, MtpPropertyValue& value);
     MtpPropertyValue*   readArrayValues(MtpDataPacket& packet, int& length);
-    void                writeArrayValues(MtpDataPacket& packet, MtpPropertyValue* values, int length);
+    void                writeArrayValues(MtpDataPacket& packet,
+                                            MtpPropertyValue* values, int length);
 };
 
 }; // namespace android
diff --git a/media/mtp/MtpServer.cpp b/media/mtp/MtpServer.cpp
index c982114..3d3bd62 100644
--- a/media/mtp/MtpServer.cpp
+++ b/media/mtp/MtpServer.cpp
@@ -55,7 +55,7 @@ static const MtpOperationCode kSupportedOperationCodes[] = {
 //    MTP_OPERATION_SELF_TEST,
 //    MTP_OPERATION_SET_OBJECT_PROTECTION,
 //    MTP_OPERATION_POWER_DOWN,
-//    MTP_OPERATION_GET_DEVICE_PROP_DESC,
+    MTP_OPERATION_GET_DEVICE_PROP_DESC,
     MTP_OPERATION_GET_DEVICE_PROP_VALUE,
     MTP_OPERATION_SET_DEVICE_PROP_VALUE,
     MTP_OPERATION_RESET_DEVICE_PROP_VALUE,
@@ -288,6 +288,9 @@ bool MtpServer::handleRequest() {
         case MTP_OPERATION_GET_OBJECT_PROP_DESC:
             response = doGetObjectPropDesc();
             break;
+        case MTP_OPERATION_GET_DEVICE_PROP_DESC:
+            response = doGetDevicePropDesc();
+            break;
         default:
             response = MTP_RESPONSE_OPERATION_NOT_SUPPORTED;
             break;