diff --git a/drivers/usb/serial/qcaux.c b/drivers/usb/serial/qcaux.c
new file mode 100644
index 0000000..6e9f8af
--- /dev/null
+++ b/drivers/usb/serial/qcaux.c
@@ -0,0 +1,90 @@
+/*
+ * Qualcomm USB Auxiliary Serial Port driver
+ *
+ * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2010 Dan Williams <dcbw@redhat.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ * Devices listed here usually provide a CDC ACM port on which normal modem
+ * AT commands and PPP can be used.  But when that port is in-use by PPP it
+ * cannot be used simultaneously for status or signal strength.  Instead, the
+ * ports here can be queried for that information using the Qualcomm DM
+ * protocol.
+ */
+
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+/* NOTE: for now, only use this driver for devices that provide a CDC-ACM port
+ * for normal AT commands, but also provide secondary USB interfaces for the
+ * QCDM-capable ports.  Devices that do not provide a CDC-ACM port should
+ * probably be driven by option.ko.
+ */
+
+/* UTStarcom/Pantech/Curitel devices */
+#define UTSTARCOM_VENDOR_ID			0x106c
+#define UTSTARCOM_PRODUCT_PC5740		0x3701
+#define UTSTARCOM_PRODUCT_PC5750		0x3702 /* aka Pantech PX-500 */
+#define UTSTARCOM_PRODUCT_UM150			0x3711
+#define UTSTARCOM_PRODUCT_UM175_V1		0x3712
+#define UTSTARCOM_PRODUCT_UM175_V2		0x3714
+#define UTSTARCOM_PRODUCT_UM175_ALLTEL		0x3715
+
+/* CMOTECH devices */
+#define CMOTECH_VENDOR_ID			0x16d8
+#define CMOTECH_PRODUCT_CDU550			0x5553
+#define CMOTECH_PRODUCT_CDX650			0x6512
+
+/* LG devices */
+#define LG_VENDOR_ID				0x1004
+#define LG_PRODUCT_VX4400_6000			0x6000 /* VX4400/VX6000/Rumor */
+
+/* Sanyo devices */
+#define SANYO_VENDOR_ID				0x0474
+#define SANYO_PRODUCT_KATANA_LX			0x0754 /* SCP-3800 (Katana LX) */
+
+/* Samsung devices */
+#define SAMSUNG_VENDOR_ID			0x04e8
+#define SAMSUNG_PRODUCT_U520			0x6640 /* SCH-U520 */
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_PC5740, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_PC5750, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_UM150, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_UM175_V1, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_UM175_V2, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, UTSTARCOM_PRODUCT_UM175_ALLTEL, 0xff, 0x00, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_CDU550, 0xff, 0xff, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_CDX650, 0xff, 0xff, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(LG_VENDOR_ID, LG_PRODUCT_VX4400_6000, 0xff, 0xff, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(SANYO_VENDOR_ID, SANYO_PRODUCT_KATANA_LX, 0xff, 0xff, 0x00) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_U520, 0xff, 0x00, 0x00) },
+	{ USB_VENDOR_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, 0xff, 0xfd, 0xff) },  /* NMEA */
+	{ USB_VENDOR_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, 0xff, 0xfe, 0xff) },  /* WMC */
+	{ USB_VENDOR_AND_INTERFACE_INFO(UTSTARCOM_VENDOR_ID, 0xff, 0xff, 0xff) },  /* DIAG */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x1fac, 0x0151, 0xff, 0xff, 0xff) },
+	{ },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_serial_driver qcaux_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"qcaux",
+	},
+	.id_table =		id_table,
+	.num_ports =		1,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&qcaux_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+MODULE_LICENSE("GPL");