linux-usb:optimize to match the Huawei USB storage devices and support new switch command

diff -uprN linux-3.8-rc3_orig/drivers/usb/storage/initializers.c linux-3.8-rc3/drivers/usb/storage/initializers.c
@@ -92,8 +92,8 @@ int usb_stor_ucr61s2b_init(struct us_dat
 	return 0;
 }
 
-/* This places the HUAWEI E220 devices in multi-port mode */
-int usb_stor_huawei_e220_init(struct us_data *us)
+/* This places the HUAWEI usb dongles in multi-port mode */
+static int usb_stor_huawei_feature_init(struct us_data *us)
 {
 	int result;
 

@@ -104,3 +104,71 @@ int usb_stor_huawei_e220_init(struct us_
 	US_DEBUGP("Huawei mode set result is %d\n", result);
 	return 0;
 }
+
+/* It will send a scsi switch command called rewind' to huawei dongle.
+ * When the dongle receives this command at the first time,
+ * it will reboot immediately. After rebooted, it will ignore this command.
+ * So it is  unnecessary to read its response. */
+static int usb_stor_huawei_scsi_init(struct us_data *us)
+{
+	int result = 0;
+	int act_len = 0;
+	struct bulk_cb_wrap *bcbw = (struct bulk_cb_wrap *) us->iobuf;
+	char rewind_cmd[] = {0x11, 0x06, 0x20, 0x00, 0x00, 0x01, 0x01, 0x00,
+			0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+	
+	bcbw->Signature = cpu_to_le32(US_BULK_CB_SIGN);
+	bcbw->Tag = 0;
+	bcbw->DataTransferLength = 0;
+	bcbw->Flags = bcbw->Lun = 0;
+	bcbw->Length = sizeof(rewind_cmd);
+	memset(bcbw->CDB, 0, sizeof(bcbw->CDB));
+	memcpy(bcbw->CDB, rewind_cmd, sizeof(rewind_cmd));
+
+	result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcbw,
+					US_BULK_CB_WRAP_LEN, &act_len);
+	US_DEBUGP("transfer actual length=%d, result=%d\n", act_len, result);
+	return result;
+}
+
+/* It tries to find the supported Huawei USB dongles.
+ * In Huawei, they assign the following product IDs
+ * for all of their mobile broadband dongles,
+ * including the new dongles in the future.
+ * So if the product ID is not included in this list,
+ * it means it is not Huawei's mobile broadband dongles.*/
+static int usb_stor_huawei_dongles_pid(struct us_data *us)
+{
+	struct usb_interface_descriptor *idesc;
+	int idProduct;
+	
+	idesc = &us->pusb_intf->cur_altsetting->desc;
+	idProduct = us->pusb_dev->descriptor.idProduct;
+	/* The first port is CDROM,
+	 * means the dongle in the single port mode,
+	 * and a switch command is required to be sent. */
+	if (idesc && idesc->bInterfaceNumber == 0) {
+		if ((idProduct == 0x1001)
+			|| (idProduct == 0x1003)
+			|| (idProduct == 0x1004)
+			|| (idProduct >= 0x1401 && idProduct <= 0x1500)
+			|| (idProduct >= 0x1505 && idProduct <= 0x1600)
+			|| (idProduct >= 0x1c02 && idProduct <= 0x2202)) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+int usb_stor_huawei_init(struct us_data *us)
+{
+	int result = 0;
+	
+	if (usb_stor_huawei_dongles_pid(us)) {
+		if (us->pusb_dev->descriptor.idProduct >= 0x1446)
+			result = usb_stor_huawei_scsi_init(us);
+		else
+			result = usb_stor_huawei_feature_init(us);
+	}
+	return result;
+}

diff -uprN linux-3.8-rc3_orig/drivers/usb/storage/initializers.h linux-3.8-rc3/drivers/usb/storage/initializers.h
@@ -46,5 +46,5 @@ int usb_stor_euscsi_init(struct us_data
  * flash reader */
 int usb_stor_ucr61s2b_init(struct us_data *us);
 
-/* This places the HUAWEI E220 devices in multi-port mode */
-int usb_stor_huawei_e220_init(struct us_data *us);
+/* This places the HUAWEI usb dongles in multi-port mode */
+int usb_stor_huawei_init(struct us_data *us);

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