USB: serial: add Moxa UPORT 11x0 driver

Add a driver which 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.

This driver is based on GPL MOXA driver written by Hen Huang and available
on MOXA website. The original driver was based on io_ti serial driver.

Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

3 files changed, 1012 insertions, 0 deletions

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index 56ecb8b5115d..f612dda9c977 100644
--- 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---
diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
index 349d9df0895f..f3fa5e53702d 100644
--- 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
diff --git a/drivers/usb/serial/mxu11x0.c b/drivers/usb/serial/mxu11x0.c
new file mode 100644
index 000000000000..8884ca276e67
--- /dev/null
+++ b/drivers/usb/serial/mxu11x0.c
@@ -0,0 +1,995 @@
+/*
+ *
+ * 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;
+	struct urb *urb;
+
+	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);
+
+	urb = port->interrupt_in_urb;
+	if (!urb) {
+		dev_err(&port->dev, "%s - no interrupt urb\n", __func__);
+		return -EINVAL;
+	}
+
+	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;
+	int status = 0;
+
+	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);
+			kfree(mxdev);
+			return err;
+		}
+
+		err = mxu1_download_firmware(serial, fw_p);
+		if (err) {
+			release_firmware(fw_p);
+			kfree(mxdev);
+			return err;
+		}
+
+		status = -ENODEV;
+		release_firmware(fw_p);
+	}
+
+	return status;
+}
+
+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 - clfag %08x, iflag %08x\n", __func__, cflag, iflag);
+
+	if (old_termios) {
+		dev_dbg(&port->dev, "%s - old clfag %08x, old iflag %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;
+
+	dev_dbg(&port->dev, "%s - start interrupt in urb\n", __func__);
+	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, "%s - cannot send open command: %d\n",
+			__func__, status);
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
+				    0, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "%s - cannot send start command: %d\n",
+			__func__, 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, "%s - cannot clear input buffers: %d\n",
+			__func__, 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, "%s - cannot clear output buffers: %d\n",
+			__func__, 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, "%s - cannot send open command: %d\n",
+			__func__, status);
+		goto unlink_int_urb;
+	}
+
+	status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
+				    0, MXU1_UART1_PORT);
+	if (status) {
+		dev_err(&port->dev, "%s - cannot send start command: %d\n",
+			__func__, status);
+		goto unlink_int_urb;
+	}
+
+	status = usb_serial_generic_open(tty, port);
+	if (status) {
+		dev_err(&port->dev, "%s - submit read urb failed: %d\n",
+			__func__, status);
+		goto unlink_int_urb;
+	}
+
+	return status;
+
+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 async_icount *icount;
+	struct mxu1_port *mxport;
+	unsigned long flags;
+
+	dev_dbg(&port->dev, "%s - msr 0x%02X\n", __func__, msr);
+
+	mxport = usb_get_serial_port_data(port);
+
+	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, "%s - hardware error: %d\n",
+			__func__, 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, "%s - unknown interrupt code: 0x%02X\n",
+			__func__, 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 mxuport11_device = {
+	.driver = {
+		.owner		= THIS_MODULE,
+		.name		= "mxuport11",
+	},
+	.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[] = {
+	&mxuport11_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");