USB-serial updates for v4.5-rc1

These updates add support for Moxa UPort 1100-series devices through a new mxu11x0 driver. The cp210x driver gains proper support for cp2108 devices by working around a couple of firmware bugs, and generic wait-until-sent support (e.g. for tcdrain) is also added. Included are also some general clean ups. Signed-off-by: Johan Hovold <johan@kernel.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJWhQifAAoJEEEN5E/e4bSV5QoQAIu6882YOuChh7T/aKUmIUKY CKBmt02IWW0w2IUjfsYSMRwLKYywbss10gv6nF0QgwlLzCy2bhh+YAf12lFDyT6n ItUSbuTIDLBtlGjUQaTBPDHkqZ9VkkKDnh/WTEzm13wuhVwdu6Lw/NAqWF5lQVSf u4pQTDS1YkFD2I7YYCYijYfCVXJD2EztGC4oaWt7LbyRPwPGnlosW7s6RZbb4Bk1 rQeHN/3LQ4lKJ+lfA87PH31Nh4mhw9FsNYjjNfBczAE/uHuRkROJXG2FOjptHEoJ zT04mx1sMCkQY7d9yit19/b+yHjwYorjFK/2pbkzU8YkkdfsXiZCVGXywiZzROKp 8DNtS+7oK/O5GeTo/5cQTC58/MEYAqgDhwDOwNj1HoP8PICzES3uKLuEC1dWzUWF VblZaAdaVg259Yim2XxSKiovujDJAR0OwApDCdCankJYcBbtYKgvz+wThFUo00f+ A568bPR3hGm38AZp1GVZa4FCR9pKEiK+5amyKBo5CBYcnkGbHUBZIKdVIrfXlb+T Pm4xOCrfwznJhviGqiuscOjPODoeIAkNofe8AKgEgbt6U3UOLa8XZxrhia4dqIe+ UoUiPt4pmL41JHNPRpte4IWTz4PW4w2KQZe4rGgXjzVmtpLKH9jrVkfWomi4oXqT tfXq//igbK+Nq3RwZ1+m =tyK5 -----END PGP SIGNATURE----- Merge tag 'usb-serial-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next Johan writes: USB-serial updates for v4.5-rc1 These updates add support for Moxa UPort 1100-series devices through a new mxu11x0 driver. The cp210x driver gains proper support for cp2108 devices by working around a couple of firmware bugs, and generic wait-until-sent support (e.g. for tcdrain) is also added. Included are also some general clean ups. Signed-off-by: Johan Hovold <johan@kernel.org>
2016-01-03 15:15:26 -08:00 · 2016-01-03 15:15:26 -08:00 · b40e9dc0b4
parent daf273350d 6ff9d2761b
commit b40e9dc0b4
6 changed files with 1180 additions and 46 deletions
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@ -475,6 +475,22 @@ config USB_SERIAL_MOS7840
 	  To compile this driver as a module, choose M here: the
 	  module will be called mos7840.  If unsure, choose N.

+config USB_SERIAL_MXUPORT11
+	tristate "USB Moxa UPORT 11x0 Serial Driver"
+	---help---
+	  Say Y here if you want to use a MOXA UPort 11x0 Serial hub.
+
+	  This driver supports:
+
+	  - UPort 1110  : 1 port RS-232 USB to Serial Hub.
+	  - UPort 1130  : 1 port RS-422/485 USB to Serial Hub.
+	  - UPort 1130I : 1 port RS-422/485 USB to Serial Hub with Isolation.
+	  - UPort 1150  : 1 port RS-232/422/485 USB to Serial Hub.
+	  - UPort 1150I : 1 port RS-232/422/485 USB to Serial Hub with Isolation.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mxu11x0.
+
 config USB_SERIAL_MXUPORT
 	tristate "USB Moxa UPORT Serial Driver"
 	---help---
--- a/drivers/usb/serial/Makefile
+++ b/drivers/usb/serial/Makefile
@ -38,6 +38,7 @@ obj-$(CONFIG_USB_SERIAL_METRO)			+= metro-usb.o
 obj-$(CONFIG_USB_SERIAL_MOS7720)		+= mos7720.o
 obj-$(CONFIG_USB_SERIAL_MOS7840)		+= mos7840.o
 obj-$(CONFIG_USB_SERIAL_MXUPORT)		+= mxuport.o
+obj-$(CONFIG_USB_SERIAL_MXUPORT11)		+= mxu11x0.o
 obj-$(CONFIG_USB_SERIAL_NAVMAN)			+= navman.o
 obj-$(CONFIG_USB_SERIAL_OMNINET)		+= omninet.o
 obj-$(CONFIG_USB_SERIAL_OPTICON)		+= opticon.o
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@ -38,13 +38,14 @@ static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
 							struct ktermios *);
 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
 							struct ktermios*);
+static bool cp210x_tx_empty(struct usb_serial_port *port);
 static int cp210x_tiocmget(struct tty_struct *);
 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 		unsigned int, unsigned int);
 static void cp210x_break_ctl(struct tty_struct *, int);
-static int cp210x_startup(struct usb_serial *);
-static void cp210x_release(struct usb_serial *);
+static int cp210x_port_probe(struct usb_serial_port *);
+static int cp210x_port_remove(struct usb_serial_port *);
 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);

 static const struct usb_device_id id_table[] = {
@ -196,8 +197,9 @@ static const struct usb_device_id id_table[] = {

 MODULE_DEVICE_TABLE(usb, id_table);

-struct cp210x_serial_private {
+struct cp210x_port_private {
 	__u8			bInterfaceNumber;
+	bool			has_swapped_line_ctl;
 };

 static struct usb_serial_driver cp210x_device = {
@ -213,10 +215,11 @@ static struct usb_serial_driver cp210x_device = {
 	.close			= cp210x_close,
 	.break_ctl		= cp210x_break_ctl,
 	.set_termios		= cp210x_set_termios,
+	.tx_empty		= cp210x_tx_empty,
 	.tiocmget		= cp210x_tiocmget,
 	.tiocmset		= cp210x_tiocmset,
-	.attach			= cp210x_startup,
-	.release		= cp210x_release,
+	.port_probe		= cp210x_port_probe,
+	.port_remove		= cp210x_port_remove,
 	.dtr_rts		= cp210x_dtr_rts
 };

@ -299,6 +302,25 @@ static struct usb_serial_driver * const serial_drivers[] = {
 #define CONTROL_WRITE_DTR	0x0100
 #define CONTROL_WRITE_RTS	0x0200

+/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
+struct cp210x_comm_status {
+	__le32   ulErrors;
+	__le32   ulHoldReasons;
+	__le32   ulAmountInInQueue;
+	__le32   ulAmountInOutQueue;
+	u8       bEofReceived;
+	u8       bWaitForImmediate;
+	u8       bReserved;
+} __packed;
+
+/*
+ * CP210X_PURGE - 16 bits passed in wValue of USB request.
+ * SiLabs app note AN571 gives a strange description of the 4 bits:
+ * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
+ * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
+ */
+#define PURGE_ALL		0x000f
+
 /*
 * cp210x_get_config
 * Reads from the CP210x configuration registers
@ -310,7 +332,7 @@ static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 		unsigned int *data, int size)
 {
 	struct usb_serial *serial = port->serial;
-	struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
+	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 	__le32 *buf;
 	int result, i, length;

@ -324,7 +346,7 @@ static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 	/* Issue the request, attempting to read 'size' bytes */
 	result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 				request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
-				spriv->bInterfaceNumber, buf, size,
+				port_priv->bInterfaceNumber, buf, size,
 				USB_CTRL_GET_TIMEOUT);

 	/* Convert data into an array of integers */
@ -355,7 +377,7 @@ static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 		unsigned int *data, int size)
 {
 	struct usb_serial *serial = port->serial;
-	struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
+	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 	__le32 *buf;
 	int result, i, length;

@ -374,13 +396,13 @@ static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 		result = usb_control_msg(serial->dev,
 				usb_sndctrlpipe(serial->dev, 0),
 				request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
-				spriv->bInterfaceNumber, buf, size,
+				port_priv->bInterfaceNumber, buf, size,
 				USB_CTRL_SET_TIMEOUT);
 	} else {
 		result = usb_control_msg(serial->dev,
 				usb_sndctrlpipe(serial->dev, 0),
 				request, REQTYPE_HOST_TO_INTERFACE, data[0],
-				spriv->bInterfaceNumber, NULL, 0,
+				port_priv->bInterfaceNumber, NULL, 0,
 				USB_CTRL_SET_TIMEOUT);
 	}

@ -409,6 +431,60 @@ static inline int cp210x_set_config_single(struct usb_serial_port *port,
 	return cp210x_set_config(port, request, &data, 2);
 }

+/*
+ * Detect CP2108 GET_LINE_CTL bug and activate workaround.
+ * Write a known good value 0x800, read it back.
+ * If it comes back swapped the bug is detected.
+ * Preserve the original register value.
+ */
+static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
+{
+	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+	unsigned int line_ctl_save;
+	unsigned int line_ctl_test;
+	int err;
+
+	err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2);
+	if (err)
+		return err;
+
+	line_ctl_test = 0x800;
+	err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2);
+	if (err)
+		return err;
+
+	err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2);
+	if (err)
+		return err;
+
+	if (line_ctl_test == 8) {
+		port_priv->has_swapped_line_ctl = true;
+		line_ctl_save = swab16((u16)line_ctl_save);
+	}
+
+	return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2);
+}
+
+/*
+ * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL)
+ * to workaround cp2108 bug and get correct value.
+ */
+static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl)
+{
+	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+	int err;
+
+	err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2);
+	if (err)
+		return err;
+
+	/* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
+	if (port_priv->has_swapped_line_ctl)
+		*ctl = swab16((u16)(*ctl));
+
+	return 0;
+}
+
 /*
 * cp210x_quantise_baudrate
 * Quantises the baud rate as per AN205 Table 1
@ -474,10 +550,62 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)

 static void cp210x_close(struct usb_serial_port *port)
 {
+	unsigned int purge_ctl;
+
 	usb_serial_generic_close(port);
+
+	/* Clear both queues; cp2108 needs this to avoid an occasional hang */
+	purge_ctl = PURGE_ALL;
+	cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2);
+
 	cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 }

+/*
+ * Read how many bytes are waiting in the TX queue.
+ */
+static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
+		u32 *count)
+{
+	struct usb_serial *serial = port->serial;
+	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+	struct cp210x_comm_status *sts;
+	int result;
+
+	sts = kmalloc(sizeof(*sts), GFP_KERNEL);
+	if (!sts)
+		return -ENOMEM;
+
+	result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+			CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
+			0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
+			USB_CTRL_GET_TIMEOUT);
+	if (result == sizeof(*sts)) {
+		*count = le32_to_cpu(sts->ulAmountInOutQueue);
+		result = 0;
+	} else {
+		dev_err(&port->dev, "failed to get comm status: %d\n", result);
+		if (result >= 0)
+			result = -EPROTO;
+	}
+
+	kfree(sts);
+
+	return result;
+}
+
+static bool cp210x_tx_empty(struct usb_serial_port *port)
+{
+	int err;
+	u32 count;
+
+	err = cp210x_get_tx_queue_byte_count(port, &count);
+	if (err)
+		return true;
+
+	return !count;
+}
+
 /*
 * cp210x_get_termios
 * Reads the baud rate, data bits, parity, stop bits and flow control mode
@ -519,7 +647,7 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,

 	cflag = *cflagp;

-	cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
+	cp210x_get_line_ctl(port, &bits);
 	cflag &= ~CSIZE;
 	switch (bits & BITS_DATA_MASK) {
 	case BITS_DATA_5:
@ -687,7 +815,7 @@ static void cp210x_set_termios(struct tty_struct *tty,

 	/* If the number of data bits is to be updated */
 	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
-		cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
+		cp210x_get_line_ctl(port, &bits);
 		bits &= ~BITS_DATA_MASK;
 		switch (cflag & CSIZE) {
 		case CS5:
@ -721,7 +849,7 @@ static void cp210x_set_termios(struct tty_struct *tty,

 	if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 	    (old_cflag & (PARENB|PARODD|CMSPAR))) {
-		cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
+		cp210x_get_line_ctl(port, &bits);
 		bits &= ~BITS_PARITY_MASK;
 		if (cflag & PARENB) {
 			if (cflag & CMSPAR) {
@ -747,7 +875,7 @@ static void cp210x_set_termios(struct tty_struct *tty,
 	}

 	if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
-		cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
+		cp210x_get_line_ctl(port, &bits);
 		bits &= ~BITS_STOP_MASK;
 		if (cflag & CSTOPB) {
 			bits |= BITS_STOP_2;
@ -862,29 +990,39 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
 	cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 }

-static int cp210x_startup(struct usb_serial *serial)
+static int cp210x_port_probe(struct usb_serial_port *port)
 {
+	struct usb_serial *serial = port->serial;
 	struct usb_host_interface *cur_altsetting;
-	struct cp210x_serial_private *spriv;
+	struct cp210x_port_private *port_priv;
+	int ret;

-	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
-	if (!spriv)
+	port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
+	if (!port_priv)
 		return -ENOMEM;

 	cur_altsetting = serial->interface->cur_altsetting;
-	spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
+	port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;

-	usb_set_serial_data(serial, spriv);
+	usb_set_serial_port_data(port, port_priv);
+
+	ret = cp210x_detect_swapped_line_ctl(port);
+	if (ret) {
+		kfree(port_priv);
+		return ret;
+	}

 	return 0;
 }

-static void cp210x_release(struct usb_serial *serial)
+static int cp210x_port_remove(struct usb_serial_port *port)
 {
-	struct cp210x_serial_private *spriv;
+	struct cp210x_port_private *port_priv;

-	spriv = usb_get_serial_data(serial);
-	kfree(spriv);
+	port_priv = usb_get_serial_port_data(port);
+	kfree(port_priv);
+
+	return 0;
 }

 module_usb_serial_driver(serial_drivers, id_table);
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@ -1046,9 +1046,8 @@ static void edge_close(struct usb_serial_port *port)

 	edge_port->closePending = true;

-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPChase))) {
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPChase) {
 		/* flush and chase */
 		edge_port->chaseResponsePending = true;

@ -1061,9 +1060,8 @@ static void edge_close(struct usb_serial_port *port)
 			edge_port->chaseResponsePending = false;
 	}

-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPClose))) {
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPClose) {
 	       /* close the port */
 		dev_dbg(&port->dev, "%s - Sending IOSP_CMD_CLOSE_PORT\n", __func__);
 		send_iosp_ext_cmd(edge_port, IOSP_CMD_CLOSE_PORT, 0);
@ -1612,9 +1610,8 @@ static void edge_break(struct tty_struct *tty, int break_state)
 	struct edgeport_serial *edge_serial = usb_get_serial_data(port->serial);
 	int status;

-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPChase))) {
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPChase) {
 		/* flush and chase */
 		edge_port->chaseResponsePending = true;

@ -1628,9 +1625,8 @@ static void edge_break(struct tty_struct *tty, int break_state)
 		}
 	}

-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPSetClrBreak))) {
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPSetClrBreak) {
 		if (break_state == -1) {
 			dev_dbg(&port->dev, "%s - Sending IOSP_CMD_SET_BREAK\n", __func__);
 			status = send_iosp_ext_cmd(edge_port,
@ -2465,9 +2461,8 @@ static void change_port_settings(struct tty_struct *tty,
 		unsigned char stop_char  = STOP_CHAR(tty);
 		unsigned char start_char = START_CHAR(tty);

-		if ((!edge_serial->is_epic) ||
-		    ((edge_serial->is_epic) &&
-		     (edge_serial->epic_descriptor.Supports.IOSPSetXChar))) {
+		if (!edge_serial->is_epic ||
+		    edge_serial->epic_descriptor.Supports.IOSPSetXChar) {
 			send_iosp_ext_cmd(edge_port,
 					IOSP_CMD_SET_XON_CHAR, start_char);
 			send_iosp_ext_cmd(edge_port,
@ -2494,13 +2489,11 @@ static void change_port_settings(struct tty_struct *tty,
 	}

 	/* Set flow control to the configured value */
-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPSetRxFlow)))
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPSetRxFlow)
 		send_iosp_ext_cmd(edge_port, IOSP_CMD_SET_RX_FLOW, rxFlow);
-	if ((!edge_serial->is_epic) ||
-	    ((edge_serial->is_epic) &&
-	     (edge_serial->epic_descriptor.Supports.IOSPSetTxFlow)))
+	if (!edge_serial->is_epic ||
+	    edge_serial->epic_descriptor.Supports.IOSPSetTxFlow)
 		send_iosp_ext_cmd(edge_port, IOSP_CMD_SET_TX_FLOW, txFlow);


--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@ -635,7 +635,7 @@ static void mos7840_interrupt_callback(struct urb *urb)
 	 * Byte 4 IIR Port 4 (port.number is 3)
 	 * Byte 5 FIFO status for both */

-	if (length && length > 5) {
+	if (length > 5) {
 		dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 		return;
 	}
--- a/drivers/usb/serial/mxu11x0.c
+++ b/drivers/usb/serial/mxu11x0.c
@ -0,0 +1,986 @@
+/*
+ * USB Moxa UPORT 11x0 Serial Driver
+ *
+ * Copyright (C) 2007 MOXA Technologies Co., Ltd.
+ * Copyright (C) 2015 Mathieu Othacehe <m.othacehe@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ *
+ * Supports the following Moxa USB to serial converters:
+ *  UPort 1110,  1 port RS-232 USB to Serial Hub.
+ *  UPort 1130,  1 port RS-422/485 USB to Serial Hub.
+ *  UPort 1130I, 1 port RS-422/485 USB to Serial Hub with isolation
+ *    protection.
+ *  UPort 1150,  1 port RS-232/422/485 USB to Serial Hub.
+ *  UPort 1150I, 1 port RS-232/422/485 USB to Serial Hub with isolation
+ *  protection.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/jiffies.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+/* Vendor and product ids */
+#define MXU1_VENDOR_ID				0x110a
+#define MXU1_1110_PRODUCT_ID			0x1110
+#define MXU1_1130_PRODUCT_ID			0x1130
+#define MXU1_1150_PRODUCT_ID			0x1150
+#define MXU1_1151_PRODUCT_ID			0x1151
+#define MXU1_1131_PRODUCT_ID			0x1131
+
+/* Commands */
+#define MXU1_GET_VERSION			0x01
+#define MXU1_GET_PORT_STATUS			0x02
+#define MXU1_GET_PORT_DEV_INFO			0x03
+#define MXU1_GET_CONFIG				0x04
+#define MXU1_SET_CONFIG				0x05
+#define MXU1_OPEN_PORT				0x06
+#define MXU1_CLOSE_PORT				0x07
+#define MXU1_START_PORT				0x08
+#define MXU1_STOP_PORT				0x09
+#define MXU1_TEST_PORT				0x0A
+#define MXU1_PURGE_PORT				0x0B
+#define MXU1_RESET_EXT_DEVICE			0x0C
+#define MXU1_GET_OUTQUEUE			0x0D
+#define MXU1_WRITE_DATA				0x80
+#define MXU1_READ_DATA				0x81
+#define MXU1_REQ_TYPE_CLASS			0x82
+
+/* Module identifiers */
+#define MXU1_I2C_PORT				0x01
+#define MXU1_IEEE1284_PORT			0x02
+#define MXU1_UART1_PORT				0x03
+#define MXU1_UART2_PORT				0x04
+#define MXU1_RAM_PORT				0x05
+
+/* Modem status */
+#define MXU1_MSR_DELTA_CTS			0x01
+#define MXU1_MSR_DELTA_DSR			0x02
+#define MXU1_MSR_DELTA_RI			0x04
+#define MXU1_MSR_DELTA_CD			0x08
+#define MXU1_MSR_CTS				0x10
+#define MXU1_MSR_DSR				0x20
+#define MXU1_MSR_RI				0x40
+#define MXU1_MSR_CD				0x80
+#define MXU1_MSR_DELTA_MASK			0x0F
+#define MXU1_MSR_MASK				0xF0
+
+/* Line status */
+#define MXU1_LSR_OVERRUN_ERROR			0x01
+#define MXU1_LSR_PARITY_ERROR			0x02
+#define MXU1_LSR_FRAMING_ERROR			0x04
+#define MXU1_LSR_BREAK				0x08
+#define MXU1_LSR_ERROR				0x0F
+#define MXU1_LSR_RX_FULL			0x10
+#define MXU1_LSR_TX_EMPTY			0x20
+
+/* Modem control */
+#define MXU1_MCR_LOOP				0x04
+#define MXU1_MCR_DTR				0x10
+#define MXU1_MCR_RTS				0x20
+
+/* Mask settings */
+#define MXU1_UART_ENABLE_RTS_IN			0x0001
+#define MXU1_UART_DISABLE_RTS			0x0002
+#define MXU1_UART_ENABLE_PARITY_CHECKING	0x0008
+#define MXU1_UART_ENABLE_DSR_OUT		0x0010
+#define MXU1_UART_ENABLE_CTS_OUT		0x0020
+#define MXU1_UART_ENABLE_X_OUT			0x0040
+#define MXU1_UART_ENABLE_XA_OUT			0x0080
+#define MXU1_UART_ENABLE_X_IN			0x0100
+#define MXU1_UART_ENABLE_DTR_IN			0x0800
+#define MXU1_UART_DISABLE_DTR			0x1000
+#define MXU1_UART_ENABLE_MS_INTS		0x2000
+#define MXU1_UART_ENABLE_AUTO_START_DMA		0x4000
+#define MXU1_UART_SEND_BREAK_SIGNAL		0x8000
+
+/* Parity */
+#define MXU1_UART_NO_PARITY			0x00
+#define MXU1_UART_ODD_PARITY			0x01
+#define MXU1_UART_EVEN_PARITY			0x02
+#define MXU1_UART_MARK_PARITY			0x03
+#define MXU1_UART_SPACE_PARITY			0x04
+
+/* Stop bits */
+#define MXU1_UART_1_STOP_BITS			0x00
+#define MXU1_UART_1_5_STOP_BITS			0x01
+#define MXU1_UART_2_STOP_BITS			0x02
+
+/* Bits per character */
+#define MXU1_UART_5_DATA_BITS			0x00
+#define MXU1_UART_6_DATA_BITS			0x01
+#define MXU1_UART_7_DATA_BITS			0x02
+#define MXU1_UART_8_DATA_BITS			0x03
+
+/* Operation modes */
+#define MXU1_UART_232				0x00
+#define MXU1_UART_485_RECEIVER_DISABLED		0x01
+#define MXU1_UART_485_RECEIVER_ENABLED		0x02
+
+/* Pipe transfer mode and timeout */
+#define MXU1_PIPE_MODE_CONTINUOUS		0x01
+#define MXU1_PIPE_MODE_MASK			0x03
+#define MXU1_PIPE_TIMEOUT_MASK			0x7C
+#define MXU1_PIPE_TIMEOUT_ENABLE		0x80
+
+/* Config struct */
+struct mxu1_uart_config {
+	__be16	wBaudRate;
+	__be16	wFlags;
+	u8	bDataBits;
+	u8	bParity;
+	u8	bStopBits;
+	char	cXon;
+	char	cXoff;
+	u8	bUartMode;
+} __packed;
+
+/* Purge modes */
+#define MXU1_PURGE_OUTPUT			0x00
+#define MXU1_PURGE_INPUT			0x80
+
+/* Read/Write data */
+#define MXU1_RW_DATA_ADDR_SFR			0x10
+#define MXU1_RW_DATA_ADDR_IDATA			0x20
+#define MXU1_RW_DATA_ADDR_XDATA			0x30
+#define MXU1_RW_DATA_ADDR_CODE			0x40
+#define MXU1_RW_DATA_ADDR_GPIO			0x50
+#define MXU1_RW_DATA_ADDR_I2C			0x60
+#define MXU1_RW_DATA_ADDR_FLASH			0x70
+#define MXU1_RW_DATA_ADDR_DSP			0x80
+
+#define MXU1_RW_DATA_UNSPECIFIED		0x00
+#define MXU1_RW_DATA_BYTE			0x01
+#define MXU1_RW_DATA_WORD			0x02
+#define MXU1_RW_DATA_DOUBLE_WORD		0x04
+
+struct mxu1_write_data_bytes {
+	u8	bAddrType;
+	u8	bDataType;
+	u8	bDataCounter;
+	__be16	wBaseAddrHi;
+	__be16	wBaseAddrLo;
+	u8	bData[0];
+} __packed;
+
+/* Interrupt codes */
+#define MXU1_CODE_HARDWARE_ERROR		0xFF
+#define MXU1_CODE_DATA_ERROR			0x03
+#define MXU1_CODE_MODEM_STATUS			0x04
+
+static inline int mxu1_get_func_from_code(unsigned char code)
+{
+	return code & 0x0f;
+}
+
+/* Download firmware max packet size */
+#define MXU1_DOWNLOAD_MAX_PACKET_SIZE		64
+
+/* Firmware image header */
+struct mxu1_firmware_header {
+	__le16 wLength;
+	u8 bCheckSum;
+} __packed;
+
+#define MXU1_UART_BASE_ADDR	    0xFFA0
+#define MXU1_UART_OFFSET_MCR	    0x0004
+
+#define MXU1_BAUD_BASE              923077
+
+#define MXU1_TRANSFER_TIMEOUT	    2
+#define MXU1_DOWNLOAD_TIMEOUT       1000
+#define MXU1_DEFAULT_CLOSING_WAIT   4000 /* in .01 secs */
+
+struct mxu1_port {
+	u8 msr;
+	u8 mcr;
+	u8 uart_mode;
+	spinlock_t spinlock; /* Protects msr */
+	struct mutex mutex; /* Protects mcr */
+	bool send_break;
+};
+
+struct mxu1_device {
+	u16 mxd_model;
+};
+
+static const struct usb_device_id mxu1_idtable[] = {
+	{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1110_PRODUCT_ID) },
+	{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1130_PRODUCT_ID) },
+	{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1150_PRODUCT_ID) },
+	{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1151_PRODUCT_ID) },
+	{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1131_PRODUCT_ID) },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(usb, mxu1_idtable);
+
+/* Write the given buffer out to the control pipe.  */
+static int mxu1_send_ctrl_data_urb(struct usb_serial *serial,
+				   u8 request,
+				   u16 value, u16 index,
+				   void *data, size_t size)
+{
+	int status;
+
+	status = usb_control_msg(serial->dev,
+				 usb_sndctrlpipe(serial->dev, 0),
+				 request,
+				 (USB_DIR_OUT | USB_TYPE_VENDOR |
+				  USB_RECIP_DEVICE), value, index,
+				 data, size,
+				 USB_CTRL_SET_TIMEOUT);
+	if (status < 0) {
+		dev_err(&serial->interface->dev,
+			"%s - usb_control_msg failed: %d\n",
+			__func__, status);
+		return status;
+	}
+
+	if (status != size) {
+		dev_err(&serial->interface->dev,
+			"%s - short write (%d / %zd)\n",
+			__func__, status, size);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/* Send a vendor request without any data */
+static int mxu1_send_ctrl_urb(struct usb_serial *serial,
+			      u8 request, u16 value, u16 index)
+{
+	return mxu1_send_ctrl_data_urb(serial, request, value, index,
+				       NULL, 0);
+}
+
+static int mxu1_download_firmware(struct usb_serial *serial,
+				  const struct firmware *fw_p)
+{
+	int status = 0;
+	int buffer_size;
+	int pos;
+	int len;
+	int done;
+	u8 cs = 0;
+	u8 *buffer;
+	struct usb_device *dev = serial->dev;
+	struct mxu1_firmware_header *header;
+	unsigned int pipe;
+
+	pipe = usb_sndbulkpipe(dev, serial->port[0]->bulk_out_endpointAddress);
+
+	buffer_size = fw_p->size + sizeof(*header);
+	buffer = kmalloc(buffer_size, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	memcpy(buffer, fw_p->data, fw_p->size);
+	memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
+
+	for (pos = sizeof(*header); pos < buffer_size; pos++)
+		cs = (u8)(cs + buffer[pos]);
+
+	header = (struct mxu1_firmware_header *)buffer;
+	header->wLength = cpu_to_le16(buffer_size - sizeof(*header));
+	header->bCheckSum = cs;
+
+	dev_dbg(&dev->dev, "%s - downloading firmware\n", __func__);
+
+	for (pos = 0; pos < buffer_size; pos += done) {
+		len = min(buffer_size - pos, MXU1_DOWNLOAD_MAX_PACKET_SIZE);
+
+		status = usb_bulk_msg(dev, pipe, buffer + pos, len, &done,
+				MXU1_DOWNLOAD_TIMEOUT);
+		if (status)
+			break;
+	}
+
+	kfree(buffer);
+
+	if (status) {
+		dev_err(&dev->dev, "failed to download firmware: %d\n", status);
+		return status;
+	}
+
+	msleep_interruptible(100);
+	usb_reset_device(dev);
+
+	dev_dbg(&dev->dev, "%s - download successful\n", __func__);
+
+	return 0;
+}
+
+static int mxu1_port_probe(struct usb_serial_port *port)
+{
+	struct mxu1_port *mxport;
+	struct mxu1_device *mxdev;
+
+	if (!port->interrupt_in_urb) {
+		dev_err(&port->dev, "no interrupt urb\n");
+		return -ENODEV;
+	}
+
+	mxport = kzalloc(sizeof(struct mxu1_port), GFP_KERNEL);
+	if (!mxport)
+		return -ENOMEM;
+
+	spin_lock_init(&mxport->spinlock);
+	mutex_init(&mxport->mutex);
+
+	mxdev = usb_get_serial_data(port->serial);
+
+	switch (mxdev->mxd_model) {
+	case MXU1_1110_PRODUCT_ID:
+	case MXU1_1150_PRODUCT_ID:
+	case MXU1_1151_PRODUCT_ID:
+		mxport->uart_mode = MXU1_UART_232;
+		break;
+	case MXU1_1130_PRODUCT_ID:
+	case MXU1_1131_PRODUCT_ID:
+		mxport->uart_mode = MXU1_UART_485_RECEIVER_DISABLED;
+		break;
+	}
+
+	usb_set_serial_port_data(port, mxport);
+
+	port->port.closing_wait =
+			msecs_to_jiffies(MXU1_DEFAULT_CLOSING_WAIT * 10);
+	port->port.drain_delay = 1;
+
+	return 0;
+}
+
+static int mxu1_startup(struct usb_serial *serial)
+{
+	struct mxu1_device *mxdev;
+	struct usb_device *dev = serial->dev;
+	struct usb_host_interface *cur_altsetting;
+	char fw_name[32];
+	const struct firmware *fw_p = NULL;
+	int err;
+
+	dev_dbg(&serial->interface->dev, "%s - product 0x%04X, num configurations %d, configuration value %d\n",
+		__func__, le16_to_cpu(dev->descriptor.idProduct),
+		dev->descriptor.bNumConfigurations,
+		dev->actconfig->desc.bConfigurationValue);
+
+	/* create device structure */
+	mxdev = kzalloc(sizeof(struct mxu1_device), GFP_KERNEL);
+	if (!mxdev)
+		return -ENOMEM;
+
+	usb_set_serial_data(serial, mxdev);
+
+	mxdev->mxd_model = le16_to_cpu(dev->descriptor.idProduct);
+
+	cur_altsetting = serial->interface->cur_altsetting;
+
+	/* if we have only 1 configuration, download firmware */
+	if (cur_altsetting->desc.bNumEndpoints == 1) {
+
+		snprintf(fw_name,
+			 sizeof(fw_name),
+			 "moxa/moxa-%04x.fw",
+			 mxdev->mxd_model);
+
+		err = request_firmware(&fw_p, fw_name, &serial->interface->dev);
+		if (err) {
+			dev_err(&serial->interface->dev, "failed to request firmware: %d\n",
+				err);
+			goto err_free_mxdev;
+		}
+
+		err = mxu1_download_firmware(serial, fw_p);
+		if (err)
+			goto err_release_firmware;
+
+		/* device is being reset */
+		err = -ENODEV;
+		goto err_release_firmware;
+	}
+
+	return 0;
+
+err_release_firmware:
+	release_firmware(fw_p);
+err_free_mxdev:
+	kfree(mxdev);
+
+	return err;
+}
+
+static int mxu1_write_byte(struct usb_serial_port *port, u32 addr,
+			   u8 mask, u8 byte)
+{
+	int status;
+	size_t size;
+	struct mxu1_write_data_bytes *data;
+
+	dev_dbg(&port->dev, "%s - addr 0x%08X, mask 0x%02X, byte 0x%02X\n",
+		__func__, addr, mask, byte);
+
+	size = sizeof(struct mxu1_write_data_bytes) + 2;
+	data = kzalloc(size, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->bAddrType = MXU1_RW_DATA_ADDR_XDATA;
+	data->bDataType = MXU1_RW_DATA_BYTE;
+	data->bDataCounter = 1;
+	data->wBaseAddrHi = cpu_to_be16(addr >> 16);
+	data->wBaseAddrLo = cpu_to_be16(addr);
+	data->bData[0] = mask;
+	data->bData[1] = byte;
+
+	status = mxu1_send_ctrl_data_urb(port->serial, MXU1_WRITE_DATA, 0,
+					 MXU1_RAM_PORT, data, size);
+	if (status < 0)
+		dev_err(&port->dev, "%s - failed: %d\n", __func__, status);
+
+	kfree(data);
+
+	return status;
+}
+
+static int mxu1_set_mcr(struct usb_serial_port *port, unsigned int mcr)
+{
+	int status;
+
+	status = mxu1_write_byte(port,
+				 MXU1_UART_BASE_ADDR + MXU1_UART_OFFSET_MCR,
+				 MXU1_MCR_RTS | MXU1_MCR_DTR | MXU1_MCR_LOOP,
+				 mcr);
+	return status;
+}
+
+static void mxu1_set_termios(struct tty_struct *tty,
+			     struct usb_serial_port *port,
+			     struct ktermios *old_termios)
+{
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+	struct mxu1_uart_config *config;
+	tcflag_t cflag, iflag;
+	speed_t baud;
+	int status;
+	unsigned int mcr;
+
+	cflag = tty->termios.c_cflag;
+	iflag = tty->termios.c_iflag;
+
+	if (old_termios &&
+	    !tty_termios_hw_change(&tty->termios, old_termios) &&
+	    tty->termios.c_iflag == old_termios->c_iflag) {
+		dev_dbg(&port->dev, "%s - nothing to change\n", __func__);
+		return;
+	}
+
+	dev_dbg(&port->dev,
+		"%s - cflag 0x%08x, iflag 0x%08x\n", __func__, cflag, iflag);
+
+	if (old_termios) {
+		dev_dbg(&port->dev, "%s - old cflag 0x%08x, old iflag 0x%08x\n",
+			__func__,
+			old_termios->c_cflag,
+			old_termios->c_iflag);
+	}
+
+	config = kzalloc(sizeof(*config), GFP_KERNEL);
+	if (!config)
+		return;
+
+	/* these flags must be set */
+	config->wFlags |= MXU1_UART_ENABLE_MS_INTS;
+	config->wFlags |= MXU1_UART_ENABLE_AUTO_START_DMA;
+	if (mxport->send_break)
+		config->wFlags |= MXU1_UART_SEND_BREAK_SIGNAL;
+	config->bUartMode = mxport->uart_mode;
+
+	switch (C_CSIZE(tty)) {
+	case CS5:
+		config->bDataBits = MXU1_UART_5_DATA_BITS;
+		break;
+	case CS6:
+		config->bDataBits = MXU1_UART_6_DATA_BITS;
+		break;
+	case CS7:
+		config->bDataBits = MXU1_UART_7_DATA_BITS;
+		break;
+	default:
+	case CS8:
+		config->bDataBits = MXU1_UART_8_DATA_BITS;
+		break;
+	}
+
+	if (C_PARENB(tty)) {
+		config->wFlags |= MXU1_UART_ENABLE_PARITY_CHECKING;
+		if (C_CMSPAR(tty)) {
+			if (C_PARODD(tty))
+				config->bParity = MXU1_UART_MARK_PARITY;
+			else
+				config->bParity = MXU1_UART_SPACE_PARITY;
+		} else {
+			if (C_PARODD(tty))
+				config->bParity = MXU1_UART_ODD_PARITY;
+			else
+				config->bParity = MXU1_UART_EVEN_PARITY;
+		}
+	} else {
+		config->bParity = MXU1_UART_NO_PARITY;
+	}
+
+	if (C_CSTOPB(tty))
+		config->bStopBits = MXU1_UART_2_STOP_BITS;
+	else
+		config->bStopBits = MXU1_UART_1_STOP_BITS;
+
+	if (C_CRTSCTS(tty)) {
+		/* RTS flow control must be off to drop RTS for baud rate B0 */
+		if (C_BAUD(tty) != B0)
+			config->wFlags |= MXU1_UART_ENABLE_RTS_IN;
+		config->wFlags |= MXU1_UART_ENABLE_CTS_OUT;
+	}
+
+	if (I_IXOFF(tty) || I_IXON(tty)) {
+		config->cXon  = START_CHAR(tty);
+		config->cXoff = STOP_CHAR(tty);
+
+		if (I_IXOFF(tty))
+			config->wFlags |= MXU1_UART_ENABLE_X_IN;
+
+		if (I_IXON(tty))
+			config->wFlags |= MXU1_UART_ENABLE_X_OUT;
+	}
+
+	baud = tty_get_baud_rate(tty);
+	if (!baud)
+		baud = 9600;
+	config->wBaudRate = MXU1_BAUD_BASE / baud;
+
+	dev_dbg(&port->dev, "%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d\n",
+		__func__, baud, config->wBaudRate, config->wFlags,
+		config->bDataBits, config->bParity, config->bStopBits,
+		config->cXon, config->cXoff, config->bUartMode);
+
+	cpu_to_be16s(&config->wBaudRate);
+	cpu_to_be16s(&config->wFlags);
+
+	status = mxu1_send_ctrl_data_urb(port->serial, MXU1_SET_CONFIG, 0,
+					 MXU1_UART1_PORT, config,
+					 sizeof(*config));
+	if (status)
+		dev_err(&port->dev, "cannot set config: %d\n", status);
+
+	mutex_lock(&mxport->mutex);
+	mcr = mxport->mcr;
+
+	if (C_BAUD(tty) == B0)
+		mcr &= ~(MXU1_MCR_DTR | MXU1_MCR_RTS);
+	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
+		mcr |= MXU1_MCR_DTR | MXU1_MCR_RTS;
+
+	status = mxu1_set_mcr(port, mcr);
+	if (status)
+		dev_err(&port->dev, "cannot set modem control: %d\n", status);
+	else
+		mxport->mcr = mcr;
+
+	mutex_unlock(&mxport->mutex);
+
+	kfree(config);
+}
+
+static int mxu1_get_serial_info(struct usb_serial_port *port,
+				struct serial_struct __user *ret_arg)
+{
+	struct serial_struct ret_serial;
+	unsigned cwait;
+
+	if (!ret_arg)
+		return -EFAULT;
+
+	cwait = port->port.closing_wait;
+	if (cwait != ASYNC_CLOSING_WAIT_NONE)
+		cwait = jiffies_to_msecs(cwait) / 10;
+
+	memset(&ret_serial, 0, sizeof(ret_serial));
+
+	ret_serial.type = PORT_16550A;
+	ret_serial.line = port->minor;
+	ret_serial.port = 0;
+	ret_serial.xmit_fifo_size = port->bulk_out_size;
+	ret_serial.baud_base = MXU1_BAUD_BASE;
+	ret_serial.close_delay = 5*HZ;
+	ret_serial.closing_wait = cwait;
+
+	if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int mxu1_set_serial_info(struct usb_serial_port *port,
+				struct serial_struct __user *new_arg)
+{
+	struct serial_struct new_serial;
+	unsigned cwait;
+
+	if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
+		return -EFAULT;
+
+	cwait = new_serial.closing_wait;
+	if (cwait != ASYNC_CLOSING_WAIT_NONE)
+		cwait = msecs_to_jiffies(10 * new_serial.closing_wait);
+
+	port->port.closing_wait = cwait;
+
+	return 0;
+}
+
+static int mxu1_ioctl(struct tty_struct *tty,
+		      unsigned int cmd, unsigned long arg)
+{
+	struct usb_serial_port *port = tty->driver_data;
+
+	switch (cmd) {
+	case TIOCGSERIAL:
+		return mxu1_get_serial_info(port,
+					    (struct serial_struct __user *)arg);
+	case TIOCSSERIAL:
+		return mxu1_set_serial_info(port,
+					    (struct serial_struct __user *)arg);
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+static int mxu1_tiocmget(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+	unsigned int result;
+	unsigned int msr;
+	unsigned int mcr;
+	unsigned long flags;
+
+	mutex_lock(&mxport->mutex);
+	spin_lock_irqsave(&mxport->spinlock, flags);
+
+	msr = mxport->msr;
+	mcr = mxport->mcr;
+
+	spin_unlock_irqrestore(&mxport->spinlock, flags);
+	mutex_unlock(&mxport->mutex);
+
+	result = ((mcr & MXU1_MCR_DTR)	? TIOCM_DTR	: 0) |
+		 ((mcr & MXU1_MCR_RTS)	? TIOCM_RTS	: 0) |
+		 ((mcr & MXU1_MCR_LOOP) ? TIOCM_LOOP	: 0) |
+		 ((msr & MXU1_MSR_CTS)	? TIOCM_CTS	: 0) |
+		 ((msr & MXU1_MSR_CD)	? TIOCM_CAR	: 0) |
+		 ((msr & MXU1_MSR_RI)	? TIOCM_RI	: 0) |
+		 ((msr & MXU1_MSR_DSR)	? TIOCM_DSR	: 0);
+
+	dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
+
+	return result;
+}
+
+static int mxu1_tiocmset(struct tty_struct *tty,
+			 unsigned int set, unsigned int clear)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+	int err;
+	unsigned int mcr;
+
+	mutex_lock(&mxport->mutex);
+	mcr = mxport->mcr;
+
+	if (set & TIOCM_RTS)
+		mcr |= MXU1_MCR_RTS;
+	if (set & TIOCM_DTR)
+		mcr |= MXU1_MCR_DTR;
+	if (set & TIOCM_LOOP)
+		mcr |= MXU1_MCR_LOOP;
+
+	if (clear & TIOCM_RTS)
+		mcr &= ~MXU1_MCR_RTS;
+	if (clear & TIOCM_DTR)
+		mcr &= ~MXU1_MCR_DTR;
+	if (clear & TIOCM_LOOP)
+		mcr &= ~MXU1_MCR_LOOP;
+
+	err = mxu1_set_mcr(port, mcr);
+	if (!err)
+		mxport->mcr = mcr;
+
+	mutex_unlock(&mxport->mutex);
+
+	return err;
+}
+
+static void mxu1_break(struct tty_struct *tty, int break_state)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+
+	if (break_state == -1)
+		mxport->send_break = true;
+	else
+		mxport->send_break = false;
+
+	mxu1_set_termios(tty, port, NULL);
+}
+
+static int mxu1_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+	struct usb_serial *serial = port->serial;
+	int status;
+	u16 open_settings;
+
+	open_settings = (MXU1_PIPE_MODE_CONTINUOUS |
+			 MXU1_PIPE_TIMEOUT_ENABLE |
+			 (MXU1_TRANSFER_TIMEOUT << 2));
+
+	mxport->msr = 0;
+
+	status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+	if (status) {
+		dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
+			status);
+		return status;
+	}
+
+	if (tty)
+		mxu1_set_termios(tty, port, NULL);
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_OPEN_PORT,
+				    open_settings, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot send open command: %d\n", status);
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
+				    0, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot send start command: %d\n", status);
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_PURGE_PORT,
+				    MXU1_PURGE_INPUT, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot clear input buffers: %d\n",
+			status);
+
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_PURGE_PORT,
+				    MXU1_PURGE_OUTPUT, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot clear output buffers: %d\n",
+			status);
+
+		goto unlink_int_urb;
+	}
+
+	/*
+	 * reset the data toggle on the bulk endpoints to work around bug in
+	 * host controllers where things get out of sync some times
+	 */
+	usb_clear_halt(serial->dev, port->write_urb->pipe);
+	usb_clear_halt(serial->dev, port->read_urb->pipe);
+
+	if (tty)
+		mxu1_set_termios(tty, port, NULL);
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_OPEN_PORT,
+				    open_settings, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot send open command: %d\n", status);
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
+				    0, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "cannot send start command: %d\n", status);
+		goto unlink_int_urb;
+	}
+
+	status = usb_serial_generic_open(tty, port);
+	if (status)
+		goto unlink_int_urb;
+
+	return 0;
+
+unlink_int_urb:
+	usb_kill_urb(port->interrupt_in_urb);
+
+	return status;
+}
+
+static void mxu1_close(struct usb_serial_port *port)
+{
+	int status;
+
+	usb_serial_generic_close(port);
+	usb_kill_urb(port->interrupt_in_urb);
+
+	status = mxu1_send_ctrl_urb(port->serial, MXU1_CLOSE_PORT,
+				    0, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "failed to send close port command: %d\n",
+			status);
+	}
+}
+
+static void mxu1_handle_new_msr(struct usb_serial_port *port, u8 msr)
+{
+	struct mxu1_port *mxport = usb_get_serial_port_data(port);
+	struct async_icount *icount;
+	unsigned long flags;
+
+	dev_dbg(&port->dev, "%s - msr 0x%02X\n", __func__, msr);
+
+	spin_lock_irqsave(&mxport->spinlock, flags);
+	mxport->msr = msr & MXU1_MSR_MASK;
+	spin_unlock_irqrestore(&mxport->spinlock, flags);
+
+	if (msr & MXU1_MSR_DELTA_MASK) {
+		icount = &port->icount;
+		if (msr & MXU1_MSR_DELTA_CTS)
+			icount->cts++;
+		if (msr & MXU1_MSR_DELTA_DSR)
+			icount->dsr++;
+		if (msr & MXU1_MSR_DELTA_CD)
+			icount->dcd++;
+		if (msr & MXU1_MSR_DELTA_RI)
+			icount->rng++;
+
+		wake_up_interruptible(&port->port.delta_msr_wait);
+	}
+}
+
+static void mxu1_interrupt_callback(struct urb *urb)
+{
+	struct usb_serial_port *port = urb->context;
+	unsigned char *data = urb->transfer_buffer;
+	int length = urb->actual_length;
+	int function;
+	int status;
+	u8 msr;
+
+	switch (urb->status) {
+	case 0:
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		dev_dbg(&port->dev, "%s - urb shutting down: %d\n",
+			__func__, urb->status);
+		return;
+	default:
+		dev_dbg(&port->dev, "%s - nonzero urb status: %d\n",
+			__func__, urb->status);
+		goto exit;
+	}
+
+	if (length != 2) {
+		dev_dbg(&port->dev, "%s - bad packet size: %d\n",
+			__func__, length);
+		goto exit;
+	}
+
+	if (data[0] == MXU1_CODE_HARDWARE_ERROR) {
+		dev_err(&port->dev, "hardware error: %d\n", data[1]);
+		goto exit;
+	}
+
+	function = mxu1_get_func_from_code(data[0]);
+
+	dev_dbg(&port->dev, "%s - function %d, data 0x%02X\n",
+		 __func__, function, data[1]);
+
+	switch (function) {
+	case MXU1_CODE_DATA_ERROR:
+		dev_dbg(&port->dev, "%s - DATA ERROR, data 0x%02X\n",
+			 __func__, data[1]);
+		break;
+
+	case MXU1_CODE_MODEM_STATUS:
+		msr = data[1];
+		mxu1_handle_new_msr(port, msr);
+		break;
+
+	default:
+		dev_err(&port->dev, "unknown interrupt code: 0x%02X\n",
+			data[1]);
+		break;
+	}
+
+exit:
+	status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (status) {
+		dev_err(&port->dev, "resubmit interrupt urb failed: %d\n",
+			status);
+	}
+}
+
+static struct usb_serial_driver mxu11x0_device = {
+	.driver = {
+		.owner		= THIS_MODULE,
+		.name		= "mxu11x0",
+	},
+	.description		= "MOXA UPort 11x0",
+	.id_table		= mxu1_idtable,
+	.num_ports		= 1,
+	.port_probe             = mxu1_port_probe,
+	.attach			= mxu1_startup,
+	.open			= mxu1_open,
+	.close			= mxu1_close,
+	.ioctl			= mxu1_ioctl,
+	.set_termios		= mxu1_set_termios,
+	.tiocmget		= mxu1_tiocmget,
+	.tiocmset		= mxu1_tiocmset,
+	.tiocmiwait		= usb_serial_generic_tiocmiwait,
+	.get_icount		= usb_serial_generic_get_icount,
+	.break_ctl		= mxu1_break,
+	.read_int_callback	= mxu1_interrupt_callback,
+};
+
+static struct usb_serial_driver *const serial_drivers[] = {
+	&mxu11x0_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, mxu1_idtable);
+
+MODULE_AUTHOR("Mathieu Othacehe <m.othacehe@gmail.com>");
+MODULE_DESCRIPTION("MOXA UPort 11x0 USB to Serial Hub Driver");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("moxa/moxa-1110.fw");
+MODULE_FIRMWARE("moxa/moxa-1130.fw");
+MODULE_FIRMWARE("moxa/moxa-1131.fw");
+MODULE_FIRMWARE("moxa/moxa-1150.fw");
+MODULE_FIRMWARE("moxa/moxa-1151.fw");