Merge tag 'usb-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB 3.5-rc1 changes from Greg Kroah-Hartman:
 "Here is the big USB 3.5-rc1 pull request for the 3.5-rc1 merge window.

  It's touches a lot of different parts of the kernel, all USB drivers,
  due to some API cleanups (getting rid of the ancient err() macro) and
  some changes that are needed for USB 3.0 power management updates.

  There are also lots of new drivers, pimarily gadget, but others as
  well.  We deleted a staging driver, which was nice, and finally
  dropped the obsolete usbfs code, which will make Al happy to never
  have to touch that again.

  There were some build errors in the tree that linux-next found a few
  days ago, but those were fixed by the most recent changes (all were
  due to us not building with CONFIG_PM disabled.)

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'usb-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (477 commits)
  xhci: Fix DIV_ROUND_UP compile error.
  xhci: Fix compile with CONFIG_USB_SUSPEND=n
  USB: Fix core compile with CONFIG_USB_SUSPEND=n
  brcm80211: Fix compile error for .disable_hub_initiated_lpm.
  Revert "USB: EHCI: work around bug in the Philips ISP1562 controller"
  MAINTAINERS: Add myself as maintainer to the USB PHY Layer
  USB: EHCI: fix command register configuration lost problem
  USB: Remove races in devio.c
  USB: ehci-platform: remove update_device
  USB: Disable hub-initiated LPM for comms devices.
  xhci: Add Intel U1/U2 timeout policy.
  xhci: Add infrastructure for host-specific LPM policies.
  USB: Add macros for interrupt endpoint types.
  xhci: Reserve one command for USB3 LPM disable.
  xhci: Some Evaluate Context commands must succeed.
  USB: Disable USB 3.0 LPM in critical sections.
  USB: Add support to enable/disable USB3 link states.
  USB: Allow drivers to disable hub-initiated LPM.
  USB: Calculate USB 3.0 exit latencies for LPM.
  USB: Refactor code to set LPM support flag.
  ...

Conflicts:
	arch/arm/mach-exynos/mach-nuri.c
	arch/arm/mach-exynos/mach-universal_c210.c
	drivers/net/wireless/ath/ath6kl/usb.c

1 files changed, 1155 insertions, 0 deletions

diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
new file mode 100644
index 000000000000..8dd88ebe9863
--- /dev/null
+++ b/drivers/usb/serial/quatech2.c
@@ -0,0 +1,1155 @@
+/*
+ * usb-serial driver for Quatech USB 2 devices
+ *
+ * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
+ *
+ * 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.
+ *
+ *
+ *  These devices all have only 1 bulk in and 1 bulk out that is shared
+ *  for all serial ports.
+ *
+ */
+
+#include <asm/unaligned.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/serial.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/uaccess.h>
+
+static bool debug;
+
+/* default urb timeout for usb operations */
+#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
+
+#define QT_OPEN_CLOSE_CHANNEL       0xca
+#define QT_SET_GET_DEVICE           0xc2
+#define QT_SET_GET_REGISTER         0xc0
+#define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
+#define QT_SET_ATF                  0xcd
+#define QT_TRANSFER_IN              0xc0
+#define QT_HW_FLOW_CONTROL_MASK     0xc5
+#define QT_SW_FLOW_CONTROL_MASK     0xc6
+#define QT2_BREAK_CONTROL	    0xc8
+#define QT2_GET_SET_UART            0xc1
+#define QT2_FLUSH_DEVICE	    0xc4
+#define QT2_GET_SET_QMCR            0xe1
+#define QT2_QMCR_RS232              0x40
+#define QT2_QMCR_RS422              0x10
+
+#define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
+
+#define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
+
+/* status bytes for the device */
+#define QT2_CONTROL_BYTE    0x1b
+#define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
+#define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
+#define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
+#define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
+#define QT2_REC_FLUSH       0x04  /* no following info */
+#define QT2_XMIT_FLUSH      0x05  /* no following info */
+#define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
+
+#define  MAX_BAUD_RATE              921600
+#define  DEFAULT_BAUD_RATE          9600
+
+#define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
+#define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
+
+/* Version Information */
+#define DRIVER_VERSION "v0.1"
+#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
+
+#define	USB_VENDOR_ID_QUATECH	0x061d
+#define QUATECH_SSU2_100	0xC120	/* RS232 single port */
+#define QUATECH_DSU2_100	0xC140	/* RS232 dual port */
+#define QUATECH_DSU2_400	0xC150	/* RS232/422/485 dual port */
+#define QUATECH_QSU2_100	0xC160	/* RS232 four port */
+#define QUATECH_QSU2_400	0xC170	/* RS232/422/485 four port */
+#define QUATECH_ESU2_100	0xC1A0	/* RS232 eight port */
+#define QUATECH_ESU2_400	0xC180	/* RS232/422/485 eight port */
+
+struct qt2_device_detail {
+	int product_id;
+	int num_ports;
+};
+
+#define QT_DETAILS(prod, ports)	\
+	.product_id = (prod),   \
+	.num_ports = (ports)
+
+static const struct qt2_device_detail qt2_device_details[] = {
+	{QT_DETAILS(QUATECH_SSU2_100, 1)},
+	{QT_DETAILS(QUATECH_DSU2_400, 2)},
+	{QT_DETAILS(QUATECH_DSU2_100, 2)},
+	{QT_DETAILS(QUATECH_QSU2_400, 4)},
+	{QT_DETAILS(QUATECH_QSU2_100, 4)},
+	{QT_DETAILS(QUATECH_ESU2_400, 8)},
+	{QT_DETAILS(QUATECH_ESU2_100, 8)},
+	{QT_DETAILS(0, 0)}	/* Terminating entry */
+};
+
+static const struct usb_device_id id_table[] = {
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
+	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
+	{}			/* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct qt2_serial_private {
+	unsigned char current_port;  /* current port for incoming data */
+
+	struct urb	*read_urb;   /* shared among all ports */
+	char		read_buffer[512];
+};
+
+struct qt2_port_private {
+	bool is_open;
+	u8   device_port;
+
+	spinlock_t urb_lock;
+	bool       urb_in_use;
+	struct urb *write_urb;
+	char       write_buffer[QT2_WRITE_BUFFER_SIZE];
+
+	spinlock_t  lock;
+	u8          shadowLSR;
+	u8          shadowMSR;
+
+	wait_queue_head_t   delta_msr_wait; /* Used for TIOCMIWAIT */
+	struct async_icount icount;
+
+	struct usb_serial_port *port;
+};
+
+static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
+static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
+static void qt2_write_bulk_callback(struct urb *urb);
+static void qt2_read_bulk_callback(struct urb *urb);
+
+static void qt2_release(struct usb_serial *serial)
+{
+	int i;
+
+	kfree(usb_get_serial_data(serial));
+
+	for (i = 0; i < serial->num_ports; i++)
+		kfree(usb_get_serial_port_data(serial->port[i]));
+}
+
+static inline int calc_baud_divisor(int baudrate)
+{
+	int divisor, rem;
+
+	divisor = MAX_BAUD_RATE / baudrate;
+	rem = MAX_BAUD_RATE % baudrate;
+	/* Round to nearest divisor */
+	if (((rem * 2) >= baudrate) && (baudrate != 110))
+		divisor++;
+
+	return divisor;
+}
+
+static inline int qt2_set_port_config(struct usb_device *dev,
+				      unsigned char port_number,
+				      u16 baudrate, u16 lcr)
+{
+	int divisor = calc_baud_divisor(baudrate);
+	u16 index = ((u16) (lcr << 8) | (u16) (port_number));
+
+	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			       QT2_GET_SET_UART, 0x40,
+			       divisor, index, NULL, 0, QT2_USB_TIMEOUT);
+}
+
+static inline int qt2_control_msg(struct usb_device *dev,
+				  u8 request, u16 data, u16 index)
+{
+	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			       request, 0x40, data, index,
+			       NULL, 0, QT2_USB_TIMEOUT);
+}
+
+static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
+{
+	u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
+
+	return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
+}
+
+
+static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
+{
+	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			       QT_SET_GET_DEVICE, 0xc0, 0, 0,
+			       data, 3, QT2_USB_TIMEOUT);
+}
+
+static inline int qt2_getregister(struct usb_device *dev,
+				  u8 uart,
+				  u8 reg,
+				  u8 *data)
+{
+	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			       QT_SET_GET_REGISTER, 0xc0, reg,
+			       uart, data, sizeof(*data), QT2_USB_TIMEOUT);
+
+}
+
+static inline int qt2_setregister(struct usb_device *dev,
+				  u8 uart, u8 reg, u16 data)
+{
+	u16 value = (data << 8) | reg;
+
+	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			       QT_SET_GET_REGISTER, 0x40, value, uart,
+			       NULL, 0, QT2_USB_TIMEOUT);
+}
+
+static inline int update_mctrl(struct qt2_port_private *port_priv,
+			       unsigned int set, unsigned int clear)
+{
+	struct usb_serial_port *port = port_priv->port;
+	struct usb_device *dev = port->serial->dev;
+	unsigned urb_value;
+	int status;
+
+	if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
+		dev_dbg(&port->dev,
+			"update_mctrl - DTR|RTS not being set|cleared\n");
+		return 0;	/* no change */
+	}
+
+	clear &= ~set;	/* 'set' takes precedence over 'clear' */
+	urb_value = 0;
+	if (set & TIOCM_DTR)
+		urb_value |= UART_MCR_DTR;
+	if (set & TIOCM_RTS)
+		urb_value |= UART_MCR_RTS;
+
+	status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
+				 urb_value);
+	if (status < 0)
+		dev_err(&port->dev,
+			"update_mctrl - Error from MODEM_CTRL urb: %i\n",
+			status);
+	return status;
+}
+
+static int qt2_calc_num_ports(struct usb_serial *serial)
+{
+	struct qt2_device_detail d;
+	int i;
+
+	for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
+		if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
+			return d.num_ports;
+	}
+
+	/* we didn't recognize the device */
+	dev_err(&serial->dev->dev,
+		 "don't know the number of ports, assuming 1\n");
+
+	return 1;
+}
+
+static void qt2_set_termios(struct tty_struct *tty,
+			    struct usb_serial_port *port,
+			    struct ktermios *old_termios)
+{
+	struct usb_device *dev = port->serial->dev;
+	struct qt2_port_private *port_priv;
+	struct ktermios *termios = tty->termios;
+	u16 baud;
+	unsigned int cflag = termios->c_cflag;
+	u16 new_lcr = 0;
+	int status;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	if (cflag & PARENB) {
+		if (cflag & PARODD)
+			new_lcr |= UART_LCR_PARITY;
+		else
+			new_lcr |= SERIAL_EVEN_PARITY;
+	}
+
+	switch (cflag & CSIZE) {
+	case CS5:
+		new_lcr |= UART_LCR_WLEN5;
+		break;
+	case CS6:
+		new_lcr |= UART_LCR_WLEN6;
+		break;
+	case CS7:
+		new_lcr |= UART_LCR_WLEN7;
+		break;
+	default:
+	case CS8:
+		new_lcr |= UART_LCR_WLEN8;
+		break;
+	}
+
+	baud = tty_get_baud_rate(tty);
+	if (!baud)
+		baud = 9600;
+
+	status = qt2_set_port_config(dev, port_priv->device_port, baud,
+				     new_lcr);
+	if (status < 0)
+		dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
+			__func__, status);
+
+	if (cflag & CRTSCTS)
+		status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
+					 SERIAL_CRTSCTS,
+					 port_priv->device_port);
+	else
+		status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
+					 0, port_priv->device_port);
+	if (status < 0)
+		dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
+			__func__, status);
+
+	if (I_IXOFF(tty) || I_IXON(tty)) {
+		u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
+
+		status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
+					 x, port_priv->device_port);
+	} else
+		status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
+					 0, port_priv->device_port);
+
+	if (status < 0)
+		dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
+			__func__, status);
+
+}
+
+static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+	struct usb_serial *serial;
+	struct qt2_serial_private *serial_priv;
+	struct qt2_port_private *port_priv;
+	u8 *data;
+	u16 device_port;
+	int status;
+	unsigned long flags;
+
+	device_port = (u16) (port->number - port->serial->minor);
+
+	serial = port->serial;
+
+	port_priv = usb_get_serial_port_data(port);
+	serial_priv = usb_get_serial_data(serial);
+
+	/* set the port to RS232 mode */
+	status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
+				 QT2_QMCR_RS232, device_port);
+	if (status < 0) {
+		dev_err(&port->dev,
+			"%s failed to set RS232 mode for port %i error %i\n",
+			__func__, device_port, status);
+		return status;
+	}
+
+	data = kzalloc(2, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/* open the port */
+	status = usb_control_msg(serial->dev,
+				 usb_rcvctrlpipe(serial->dev, 0),
+				 QT_OPEN_CLOSE_CHANNEL,
+				 0xc0, 0,
+				 device_port, data, 2, QT2_USB_TIMEOUT);
+
+	if (status < 0) {
+		dev_err(&port->dev, "%s - open port failed %i", __func__,
+			status);
+		kfree(data);
+		return status;
+	}
+
+	spin_lock_irqsave(&port_priv->lock, flags);
+	port_priv->shadowLSR = data[0];
+	port_priv->shadowMSR = data[1];
+	spin_unlock_irqrestore(&port_priv->lock, flags);
+
+	kfree(data);
+
+	/* set to default speed and 8bit word size */
+	status = qt2_set_port_config(serial->dev, device_port,
+				     DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
+	if (status < 0) {
+		dev_err(&port->dev,
+			"%s - initial setup failed for port %i (%i)\n",
+			__func__, port->number, device_port);
+		return status;
+	}
+
+	port_priv->is_open = true;
+	port_priv->device_port = (u8) device_port;
+
+	if (tty)
+		qt2_set_termios(tty, port, tty->termios);
+
+	return 0;
+
+}
+
+static void qt2_close(struct usb_serial_port *port)
+{
+	struct usb_serial *serial;
+	struct qt2_serial_private *serial_priv;
+	struct qt2_port_private *port_priv;
+	unsigned long flags;
+	int i;
+
+	serial = port->serial;
+	serial_priv = usb_get_serial_data(serial);
+	port_priv = usb_get_serial_port_data(port);
+
+	port_priv->is_open = false;
+
+	spin_lock_irqsave(&port_priv->urb_lock, flags);
+	if (port_priv->write_urb->status == -EINPROGRESS)
+		usb_kill_urb(port_priv->write_urb);
+	port_priv->urb_in_use = false;
+	spin_unlock_irqrestore(&port_priv->urb_lock, flags);
+
+	/* flush the port transmit buffer */
+	i = usb_control_msg(serial->dev,
+			    usb_rcvctrlpipe(serial->dev, 0),
+			    QT2_FLUSH_DEVICE, 0x40, 1,
+			    port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
+
+	if (i < 0)
+		dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
+			__func__, i);
+
+	/* flush the port receive buffer */
+	i = usb_control_msg(serial->dev,
+			    usb_rcvctrlpipe(serial->dev, 0),
+			    QT2_FLUSH_DEVICE, 0x40, 0,
+			    port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
+
+	if (i < 0)
+		dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
+			__func__, i);
+
+	/* close the port */
+	i = usb_control_msg(serial->dev,
+			    usb_sndctrlpipe(serial->dev, 0),
+			    QT_OPEN_CLOSE_CHANNEL,
+			    0x40, 0,
+			    port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
+
+	if (i < 0)
+		dev_err(&port->dev, "%s - close port failed %i\n",
+			__func__, i);
+
+}
+
+static void qt2_disconnect(struct usb_serial *serial)
+{
+	struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
+	struct qt2_port_private *port_priv;
+	int i;
+
+	if (serial_priv->read_urb->status == -EINPROGRESS)
+		usb_kill_urb(serial_priv->read_urb);
+
+	usb_free_urb(serial_priv->read_urb);
+
+	for (i = 0; i < serial->num_ports; i++) {
+		port_priv = usb_get_serial_port_data(serial->port[i]);
+
+		if (port_priv->write_urb->status == -EINPROGRESS)
+			usb_kill_urb(port_priv->write_urb);
+		usb_free_urb(port_priv->write_urb);
+	}
+}
+
+static int get_serial_info(struct usb_serial_port *port,
+			   struct serial_struct __user *retinfo)
+{
+	struct serial_struct tmp;
+
+	if (!retinfo)
+		return -EFAULT;
+
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.line		= port->serial->minor;
+	tmp.port		= 0;
+	tmp.irq			= 0;
+	tmp.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
+	tmp.xmit_fifo_size	= port->bulk_out_size;
+	tmp.baud_base		= 9600;
+	tmp.close_delay		= 5*HZ;
+	tmp.closing_wait	= 30*HZ;
+
+	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+		return -EFAULT;
+	return 0;
+}
+
+static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
+{
+	struct qt2_port_private *priv = usb_get_serial_port_data(port);
+	struct async_icount prev, cur;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	prev = priv->icount;
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	while (1) {
+		wait_event_interruptible(priv->delta_msr_wait,
+					 ((priv->icount.rng != prev.rng) ||
+					  (priv->icount.dsr != prev.dsr) ||
+					  (priv->icount.dcd != prev.dcd) ||
+					  (priv->icount.cts != prev.cts)));
+
+		if (signal_pending(current))
+			return -ERESTARTSYS;
+
+		spin_lock_irqsave(&priv->lock, flags);
+		cur = priv->icount;
+		spin_unlock_irqrestore(&priv->lock, flags);
+
+		if ((prev.rng == cur.rng) &&
+		    (prev.dsr == cur.dsr) &&
+		    (prev.dcd == cur.dcd) &&
+		    (prev.cts == cur.cts))
+			return -EIO;
+
+		if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
+		    (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
+		    (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
+		    (arg & TIOCM_CTS && (prev.cts != cur.cts)))
+			return 0;
+	}
+	return 0;
+}
+
+static int qt2_get_icount(struct tty_struct *tty,
+			  struct serial_icounter_struct *icount)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct qt2_port_private *priv = usb_get_serial_port_data(port);
+	struct async_icount cnow = priv->icount;
+
+	icount->cts = cnow.cts;
+	icount->dsr = cnow.dsr;
+	icount->rng = cnow.rng;
+	icount->dcd = cnow.dcd;
+	icount->rx = cnow.rx;
+	icount->tx = cnow.tx;
+	icount->frame = cnow.frame;
+	icount->overrun = cnow.overrun;
+	icount->parity = cnow.parity;
+	icount->brk = cnow.brk;
+	icount->buf_overrun = cnow.buf_overrun;
+
+	return 0;
+}
+
+static int qt2_ioctl(struct tty_struct *tty,
+		     unsigned int cmd, unsigned long arg)
+{
+	struct usb_serial_port *port = tty->driver_data;
+
+	switch (cmd) {
+	case TIOCGSERIAL:
+		return get_serial_info(port,
+				       (struct serial_struct __user *)arg);
+
+	case TIOCMIWAIT:
+		return wait_modem_info(port, arg);
+
+	default:
+		break;
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
+{
+	switch (*ch) {
+	case QT2_LINE_STATUS:
+		qt2_update_lsr(port, ch + 1);
+		break;
+	case QT2_MODEM_STATUS:
+		qt2_update_msr(port, ch + 1);
+		break;
+	}
+}
+
+/* not needed, kept to document functionality */
+static void qt2_process_xmit_empty(struct usb_serial_port *port,
+				   unsigned char *ch)
+{
+	int bytes_written;
+
+	bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
+}
+
+/* not needed, kept to document functionality */
+static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
+{
+	return;
+}
+
+void qt2_process_read_urb(struct urb *urb)
+{
+	struct usb_serial *serial;
+	struct qt2_serial_private *serial_priv;
+	struct usb_serial_port *port;
+	struct qt2_port_private *port_priv;
+	struct tty_struct *tty;
+	bool escapeflag;
+	unsigned char *ch;
+	int i;
+	unsigned char newport;
+	int len = urb->actual_length;
+
+	if (!len)
+		return;
+
+	ch = urb->transfer_buffer;
+	tty = NULL;
+	serial = urb->context;
+	serial_priv = usb_get_serial_data(serial);
+	port = serial->port[serial_priv->current_port];
+	port_priv = usb_get_serial_port_data(port);
+
+	if (port_priv->is_open)
+		tty = tty_port_tty_get(&port->port);
+
+	for (i = 0; i < urb->actual_length; i++) {
+		ch = (unsigned char *)urb->transfer_buffer + i;
+		if ((i <= (len - 3)) &&
+		    (*ch == QT2_CONTROL_BYTE) &&
+		    (*(ch + 1) == QT2_CONTROL_BYTE)) {
+			escapeflag = false;
+			switch (*(ch + 2)) {
+			case QT2_LINE_STATUS:
+			case QT2_MODEM_STATUS:
+				if (i > (len - 4)) {
+					dev_warn(&port->dev,
+						 "%s - status message too short\n",
+						__func__);
+					break;
+				}
+				qt2_process_status(port, ch + 2);
+				i += 3;
+				escapeflag = true;
+				break;
+			case QT2_XMIT_HOLD:
+				if (i > (len - 5)) {
+					dev_warn(&port->dev,
+						 "%s - xmit_empty message too short\n",
+						 __func__);
+					break;
+				}
+				qt2_process_xmit_empty(port, ch + 3);
+				i += 4;
+				escapeflag = true;
+				break;
+			case QT2_CHANGE_PORT:
+				if (i > (len - 4)) {
+					dev_warn(&port->dev,
+						 "%s - change_port message too short\n",
+						 __func__);
+					break;
+				}
+				if (tty) {
+					tty_flip_buffer_push(tty);
+					tty_kref_put(tty);
+				}
+
+				newport = *(ch + 3);
+
+				if (newport > serial->num_ports) {
+					dev_err(&port->dev,
+						"%s - port change to invalid port: %i\n",
+						__func__, newport);
+					break;
+				}
+
+				serial_priv->current_port = newport;
+				port = serial->port[serial_priv->current_port];
+				port_priv = usb_get_serial_port_data(port);
+				if (port_priv->is_open)
+					tty = tty_port_tty_get(&port->port);
+				else
+					tty = NULL;
+				i += 3;
+				escapeflag = true;
+				break;
+			case QT2_REC_FLUSH:
+			case QT2_XMIT_FLUSH:
+				qt2_process_flush(port, ch + 2);
+				i += 2;
+				escapeflag = true;
+				break;
+			case QT2_CONTROL_ESCAPE:
+				tty_buffer_request_room(tty, 2);
+				tty_insert_flip_string(tty, ch, 2);
+				i += 2;
+				escapeflag = true;
+				break;
+			default:
+				dev_warn(&port->dev,
+					 "%s - unsupported command %i\n",
+					 __func__, *(ch + 2));
+				break;
+			}
+			if (escapeflag)
+				continue;
+		}
+
+		if (tty) {
+			tty_buffer_request_room(tty, 1);
+			tty_insert_flip_string(tty, ch, 1);
+		}
+	}
+
+	if (tty) {
+		tty_flip_buffer_push(tty);
+		tty_kref_put(tty);
+	}
+}
+
+static void qt2_write_bulk_callback(struct urb *urb)
+{
+	struct usb_serial_port *port;
+	struct qt2_port_private *port_priv;
+
+	port = urb->context;
+	port_priv = usb_get_serial_port_data(port);
+
+	spin_lock(&port_priv->urb_lock);
+
+	port_priv->urb_in_use = false;
+	usb_serial_port_softint(port);
+
+	spin_unlock(&port_priv->urb_lock);
+
+}
+
+static void qt2_read_bulk_callback(struct urb *urb)
+{
+	struct usb_serial *serial = urb->context;
+	int status;
+
+	if (urb->status) {
+		dev_warn(&serial->dev->dev,
+			 "%s - non-zero urb status: %i\n", __func__,
+			 urb->status);
+		return;
+	}
+
+	qt2_process_read_urb(urb);
+
+	status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (status != 0)
+		dev_err(&serial->dev->dev,
+			"%s - resubmit read urb failed: %i\n",
+			__func__, status);
+}
+
+static int qt2_setup_urbs(struct usb_serial *serial)
+{
+	struct usb_serial_port *port;
+	struct usb_serial_port *port0;
+	struct qt2_serial_private *serial_priv;
+	struct qt2_port_private *port_priv;
+	int pcount, status;
+
+	port0 = serial->port[0];
+
+	serial_priv = usb_get_serial_data(serial);
+	serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!serial_priv->read_urb) {
+		dev_err(&serial->dev->dev, "No free urbs available\n");
+		return -ENOMEM;
+	}
+
+	usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
+			  usb_rcvbulkpipe(serial->dev,
+					  port0->bulk_in_endpointAddress),
+			  serial_priv->read_buffer,
+			  sizeof(serial_priv->read_buffer),
+			  qt2_read_bulk_callback, serial);
+
+	/* setup write_urb for each port */
+	for (pcount = 0; pcount < serial->num_ports; pcount++) {
+
+		port = serial->port[pcount];
+		port_priv = usb_get_serial_port_data(port);
+
+		port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!port_priv->write_urb) {
+			dev_err(&serial->dev->dev,
+				"failed to alloc write_urb for port %i\n",
+				pcount);
+			return -ENOMEM;
+		}
+
+		usb_fill_bulk_urb(port_priv->write_urb,
+				  serial->dev,
+				  usb_sndbulkpipe(serial->dev,
+						  port0->
+						  bulk_out_endpointAddress),
+				  port_priv->write_buffer,
+				  sizeof(port_priv->write_buffer),
+				  qt2_write_bulk_callback, port);
+	}
+
+	status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
+	if (status != 0) {
+		dev_err(&serial->dev->dev,
+			"%s - submit read urb failed %i\n", __func__, status);
+		return status;
+	}
+
+	return 0;
+
+}
+
+static int qt2_attach(struct usb_serial *serial)
+{
+	struct qt2_serial_private *serial_priv;
+	struct qt2_port_private *port_priv;
+	int status, pcount;
+
+	/* power on unit */
+	status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+				 0xc2, 0x40, 0x8000, 0, NULL, 0,
+				 QT2_USB_TIMEOUT);
+	if (status < 0) {
+		dev_err(&serial->dev->dev,
+			"%s - failed to power on unit: %i\n", __func__, status);
+		return status;
+	}
+
+	serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
+	if (!serial_priv) {
+		dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
+		return -ENOMEM;
+	}
+
+	usb_set_serial_data(serial, serial_priv);
+
+	for (pcount = 0; pcount < serial->num_ports; pcount++) {
+		port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
+		if (!port_priv) {
+			dev_err(&serial->dev->dev,
+				"%s- kmalloc(%Zd) failed.\n", __func__,
+				sizeof(*port_priv));
+			pcount--;
+			status = -ENOMEM;
+			goto attach_failed;
+		}
+
+		spin_lock_init(&port_priv->lock);
+		spin_lock_init(&port_priv->urb_lock);
+		init_waitqueue_head(&port_priv->delta_msr_wait);
+
+		port_priv->port = serial->port[pcount];
+
+		usb_set_serial_port_data(serial->port[pcount], port_priv);
+	}
+
+	status = qt2_setup_urbs(serial);
+	if (status != 0)
+		goto attach_failed;
+
+	return 0;
+
+attach_failed:
+	for (/* empty */; pcount >= 0; pcount--) {
+		port_priv = usb_get_serial_port_data(serial->port[pcount]);
+		kfree(port_priv);
+	}
+	kfree(serial_priv);
+	return status;
+}
+
+static int qt2_tiocmget(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct usb_device *dev = port->serial->dev;
+	struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
+	u8 *d;
+	int r;
+
+	d = kzalloc(2, GFP_KERNEL);
+	if (!d)
+		return -ENOMEM;
+
+	r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
+	if (r < 0)
+		goto mget_out;
+
+	r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
+	if (r < 0)
+		goto mget_out;
+
+	r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
+	    (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
+	    (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
+	    (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
+	    (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
+	    (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
+
+mget_out:
+	kfree(d);
+	return r;
+}
+
+static int qt2_tiocmset(struct tty_struct *tty,
+			unsigned int set, unsigned int clear)
+{
+	struct qt2_port_private *port_priv;
+
+	port_priv = usb_get_serial_port_data(tty->driver_data);
+	return update_mctrl(port_priv, set, clear);
+}
+
+static void qt2_break_ctl(struct tty_struct *tty, int break_state)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct qt2_port_private *port_priv;
+	int status;
+	u16 val;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	if (!port_priv->is_open) {
+		dev_err(&port->dev,
+			"%s - port is not open\n", __func__);
+		return;
+	}
+
+	val = (break_state == -1) ? 1 : 0;
+
+	status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
+				 val, port_priv->device_port);
+	if (status < 0)
+		dev_warn(&port->dev,
+			 "%s - failed to send control message: %i\n", __func__,
+			 status);
+}
+
+
+
+static void qt2_dtr_rts(struct usb_serial_port *port, int on)
+{
+	struct usb_device *dev = port->serial->dev;
+	struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
+
+	mutex_lock(&port->serial->disc_mutex);
+	if (!port->serial->disconnected) {
+		/* Disable flow control */
+		if (!on && qt2_setregister(dev, port_priv->device_port,
+					   UART_MCR, 0) < 0)
+			dev_warn(&port->dev, "error from flowcontrol urb\n");
+		/* drop RTS and DTR */
+		if (on)
+			update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
+		else
+			update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
+	}
+	mutex_unlock(&port->serial->disc_mutex);
+}
+
+static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
+{
+	struct qt2_port_private *port_priv;
+	u8 newMSR = (u8) *ch;
+	unsigned long flags;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave(&port_priv->lock, flags);
+	port_priv->shadowMSR = newMSR;
+	spin_unlock_irqrestore(&port_priv->lock, flags);
+
+	if (newMSR & UART_MSR_ANY_DELTA) {
+		/* update input line counters */
+		if (newMSR & UART_MSR_DCTS)
+			port_priv->icount.cts++;
+
+		if (newMSR & UART_MSR_DDSR)
+			port_priv->icount.dsr++;
+
+		if (newMSR & UART_MSR_DDCD)
+			port_priv->icount.dcd++;
+
+		if (newMSR & UART_MSR_TERI)
+			port_priv->icount.rng++;
+
+		wake_up_interruptible(&port_priv->delta_msr_wait);
+	}
+}
+
+static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
+{
+	struct qt2_port_private *port_priv;
+	struct async_icount *icount;
+	unsigned long flags;
+	u8 newLSR = (u8) *ch;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	if (newLSR & UART_LSR_BI)
+		newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
+
+	spin_lock_irqsave(&port_priv->lock, flags);
+	port_priv->shadowLSR = newLSR;
+	spin_unlock_irqrestore(&port_priv->lock, flags);
+
+	icount = &port_priv->icount;
+
+	if (newLSR & UART_LSR_BRK_ERROR_BITS) {
+
+		if (newLSR & UART_LSR_BI)
+			icount->brk++;
+
+		if (newLSR & UART_LSR_OE)
+			icount->overrun++;
+
+		if (newLSR & UART_LSR_PE)
+			icount->parity++;
+
+		if (newLSR & UART_LSR_FE)
+			icount->frame++;
+	}
+
+}
+
+static int qt2_write_room(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct qt2_port_private *port_priv;
+	unsigned long flags = 0;
+	int r;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave(&port_priv->urb_lock, flags);
+
+	if (port_priv->urb_in_use)
+		r = 0;
+	else
+		r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
+
+	spin_unlock_irqrestore(&port_priv->urb_lock, flags);
+
+	return r;
+}
+
+static int qt2_write(struct tty_struct *tty,
+		     struct usb_serial_port *port,
+		     const unsigned char *buf, int count)
+{
+	struct qt2_port_private *port_priv;
+	struct urb *write_urb;
+	unsigned char *data;
+	unsigned long flags;
+	int status;
+	int bytes_out = 0;
+
+	port_priv = usb_get_serial_port_data(port);
+
+	if (port_priv->write_urb == NULL) {
+		dev_err(&port->dev, "%s - no output urb\n", __func__);
+		return 0;
+	}
+	write_urb = port_priv->write_urb;
+
+	count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
+
+	data = write_urb->transfer_buffer;
+	spin_lock_irqsave(&port_priv->urb_lock, flags);
+	if (port_priv->urb_in_use == true) {
+		printk(KERN_INFO "qt2_write - urb is in use\n");
+		goto write_out;
+	}
+
+	*data++ = QT2_CONTROL_BYTE;
+	*data++ = QT2_CONTROL_BYTE;
+	*data++ = port_priv->device_port;
+	put_unaligned_le16(count, data);
+	data += 2;
+	memcpy(data, buf, count);
+
+	write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
+
+	status = usb_submit_urb(write_urb, GFP_ATOMIC);
+	if (status == 0) {
+		port_priv->urb_in_use = true;
+		bytes_out += count;
+	}
+
+write_out:
+	spin_unlock_irqrestore(&port_priv->urb_lock, flags);
+	return bytes_out;
+}
+
+
+static struct usb_serial_driver qt2_device = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "quatech-serial",
+	},
+	.description	     = DRIVER_DESC,
+	.id_table	     = id_table,
+	.open		     = qt2_open,
+	.close		     = qt2_close,
+	.write               = qt2_write,
+	.write_room          = qt2_write_room,
+	.calc_num_ports      = qt2_calc_num_ports,
+	.attach              = qt2_attach,
+	.release             = qt2_release,
+	.disconnect          = qt2_disconnect,
+	.dtr_rts             = qt2_dtr_rts,
+	.break_ctl           = qt2_break_ctl,
+	.tiocmget            = qt2_tiocmget,
+	.tiocmset            = qt2_tiocmset,
+	.get_icount	     = qt2_get_icount,
+	.ioctl               = qt2_ioctl,
+	.set_termios         = qt2_set_termios,
+};
+
+static struct usb_serial_driver *const serial_drivers[] = {
+	&qt2_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");