usb: gadget: mtp: add new ioctl for compat

Define a new ioctl for MTP_SEND_EVENT, as its
ioctl numbers depends on the size of struct
mtp_event, which varies in ARCH32 and ARCH64.

Bug 1466403

Change-Id: I1d172aae422ca483b00c6dd59e739166f40c53ce
Signed-off-by: Rohith Seelaboyina <rseelaboyina@nvidia.com>
Reviewed-on: http://git-master/r/377800
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>

include/uapi/linux/usb/f_mtp.h

@@ -4,6 +4,8 @@
  * Copyright (C) 2010 Google, Inc.
  * Author: Mike Lockwood <lockwood@android.com>
  *
+ * Copyright (C) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
@@ -45,6 +47,17 @@ struct mtp_event {
 	void		*data;
 };
 
+#ifdef CONFIG_COMPAT
+struct mtp_event_32 {
+	/* size of the event */
+	compat_size_t	length;
+	/* event data to send */
+	compat_uptr_t	data;
+};
+
+#define MTP_SEND_EVENT_32          _IOW('M', 3, struct mtp_event_32)
+#endif
+
 /* Sends the specified file range to the host */
 #define MTP_SEND_FILE              _IOW('M', 0, struct mtp_file_range)
 /* Receives data from the host and writes it to a file.