quatech2.c 24.3 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * usb-serial driver for Quatech USB 2 devices
 *
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 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
 *
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 *  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/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>

/* 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

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#define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
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#define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
#define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */

#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 */
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	char		*read_buffer;
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};

struct qt2_port_private {
	u8   device_port;

	spinlock_t urb_lock;
	bool       urb_in_use;
	struct urb *write_urb;
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	char       *write_buffer;
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	spinlock_t  lock;
	u8          shadowLSR;
	u8          shadowMSR;

	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)
{
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	struct qt2_serial_private *serial_priv;
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	serial_priv = usb_get_serial_data(serial);
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	usb_kill_urb(serial_priv->read_urb);
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	usb_free_urb(serial_priv->read_urb);
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	kfree(serial_priv->read_buffer);
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	kfree(serial_priv);
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}

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_getregister(struct usb_device *dev,
				  u8 uart,
				  u8 reg,
				  u8 *data)
{
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	int ret;

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      QT_SET_GET_REGISTER, 0xc0, reg,
			      uart, data, sizeof(*data), QT2_USB_TIMEOUT);
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	if (ret < (int)sizeof(*data)) {
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		if (ret >= 0)
			ret = -EIO;
	}
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	return ret;
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}

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;
}

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static int qt2_calc_num_ports(struct usb_serial *serial,
					struct usb_serial_endpoints *epds)
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{
	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;
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	struct ktermios *termios = &tty->termios;
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	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_port_private *port_priv;
	u8 *data;
	u16 device_port;
	int status;
	unsigned long flags;

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	device_port = port->port_number;
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	serial = port->serial;

	port_priv = usb_get_serial_port_data(port);

	/* 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);

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	if (status < 2) {
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		dev_err(&port->dev, "%s - open port failed %i\n", __func__,
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			status);
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		if (status >= 0)
			status = -EIO;
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		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) {
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		dev_err(&port->dev, "%s - initial setup failed (%i)\n",
			__func__, device_port);
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		return status;
	}

	port_priv->device_port = (u8) device_port;

	if (tty)
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		qt2_set_termios(tty, port, &tty->termios);
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	return 0;

}

static void qt2_close(struct usb_serial_port *port)
{
	struct usb_serial *serial;
	struct qt2_port_private *port_priv;
	int i;

	serial = port->serial;
	port_priv = usb_get_serial_port_data(port);

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	usb_kill_urb(port_priv->write_urb);
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	/* 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);

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	usb_kill_urb(serial_priv->read_urb);
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}

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static int get_serial_info(struct tty_struct *tty,
			   struct serial_struct *ss)
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{
	struct usb_serial_port *port = tty->driver_data;

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	ss->line		= port->minor;
	ss->port		= 0;
	ss->irq			= 0;
	ss->xmit_fifo_size	= port->bulk_out_size;
	ss->baud_base		= 9600;
	ss->close_delay		= 5*HZ;
	ss->closing_wait	= 30*HZ;
	return 0;
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}

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;
	}
}

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static void qt2_process_read_urb(struct urb *urb)
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{
	struct usb_serial *serial;
	struct qt2_serial_private *serial_priv;
	struct usb_serial_port *port;
	bool escapeflag;
	unsigned char *ch;
	int i;
	unsigned char newport;
	int len = urb->actual_length;

	if (!len)
		return;

	ch = urb->transfer_buffer;
	serial = urb->context;
	serial_priv = usb_get_serial_data(serial);
	port = serial->port[serial_priv->current_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;
				}
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				/* bytes_written = (ch[1] << 4) + ch[0]; */
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				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;
				}
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				tty_flip_buffer_push(&port->port);
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				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];
				i += 3;
				escapeflag = true;
				break;
			case QT2_REC_FLUSH:
			case QT2_XMIT_FLUSH:
				i += 2;
				escapeflag = true;
				break;
			case QT2_CONTROL_ESCAPE:
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				tty_insert_flip_string(&port->port, ch, 2);
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				i += 2;
				escapeflag = true;
				break;
			default:
				dev_warn(&port->dev,
					 "%s - unsupported command %i\n",
					 __func__, *(ch + 2));
				break;
			}
			if (escapeflag)
				continue;
		}

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		tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
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	}

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	tty_flip_buffer_push(&port->port);
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}

static void qt2_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port;
	struct qt2_port_private *port_priv;
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	unsigned long flags;
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	port = urb->context;
	port_priv = usb_get_serial_port_data(port);

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	spin_lock_irqsave(&port_priv->urb_lock, flags);
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	port_priv->urb_in_use = false;
	usb_serial_port_softint(port);

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	spin_unlock_irqrestore(&port_priv->urb_lock, flags);
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}

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 *port0;
	struct qt2_serial_private *serial_priv;
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	int status;
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	port0 = serial->port[0];

	serial_priv = usb_get_serial_data(serial);
	serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
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	if (!serial_priv->read_urb)
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		return -ENOMEM;

	usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
			  usb_rcvbulkpipe(serial->dev,
					  port0->bulk_in_endpointAddress),
			  serial_priv->read_buffer,
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			  QT2_READ_BUFFER_SIZE,
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			  qt2_read_bulk_callback, serial);

	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);
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		usb_free_urb(serial_priv->read_urb);
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		return status;
	}

	return 0;
}

static int qt2_attach(struct usb_serial *serial)
{
	struct qt2_serial_private *serial_priv;
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	int status;
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	/* 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);
667
	if (!serial_priv)
668 669
		return -ENOMEM;

670 671 672 673 674 675
	serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
	if (!serial_priv->read_buffer) {
		status = -ENOMEM;
		goto err_buf;
	}

676 677 678 679 680 681 682 683 684
	usb_set_serial_data(serial, serial_priv);

	status = qt2_setup_urbs(serial);
	if (status != 0)
		goto attach_failed;

	return 0;

attach_failed:
685 686
	kfree(serial_priv->read_buffer);
err_buf:
687 688 689 690
	kfree(serial_priv);
	return status;
}

691 692 693 694 695 696 697 698 699 700 701 702 703 704
static int qt2_port_probe(struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	struct qt2_port_private *port_priv;
	u8 bEndpointAddress;

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

	spin_lock_init(&port_priv->lock);
	spin_lock_init(&port_priv->urb_lock);
	port_priv->port = port;

705 706 707 708
	port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
	if (!port_priv->write_buffer)
		goto err_buf;

709
	port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
710 711 712
	if (!port_priv->write_urb)
		goto err_urb;

713 714 715 716
	bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
	usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
				usb_sndbulkpipe(serial->dev, bEndpointAddress),
				port_priv->write_buffer,
717
				QT2_WRITE_BUFFER_SIZE,
718 719 720 721 722
				qt2_write_bulk_callback, port);

	usb_set_serial_port_data(port, port_priv);

	return 0;
723 724 725 726 727
err_urb:
	kfree(port_priv->write_buffer);
err_buf:
	kfree(port_priv);
	return -ENOMEM;
728 729 730 731 732 733 734 735
}

static int qt2_port_remove(struct usb_serial_port *port)
{
	struct qt2_port_private *port_priv;

	port_priv = usb_get_serial_port_data(port);
	usb_free_urb(port_priv->write_urb);
736
	kfree(port_priv->write_buffer);
737 738 739 740 741
	kfree(port_priv);

	return 0;
}

742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
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);

	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);

809 810 811
	/* Disable flow control */
	if (!on) {
		if (qt2_setregister(dev, port_priv->device_port,
812 813 814
					   UART_MCR, 0) < 0)
			dev_warn(&port->dev, "error from flowcontrol urb\n");
	}
815 816 817 818 819
	/* 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);
820 821 822 823 824 825 826 827
}

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;

828
	/* May be called from qt2_process_read_urb() for an unbound port. */
829
	port_priv = usb_get_serial_port_data(port);
830 831
	if (!port_priv)
		return;
832 833 834 835 836 837 838 839

	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)
840
			port->icount.cts++;
841
		if (newMSR & UART_MSR_DDSR)
842
			port->icount.dsr++;
843
		if (newMSR & UART_MSR_DDCD)
844
			port->icount.dcd++;
845
		if (newMSR & UART_MSR_TERI)
846
			port->icount.rng++;
847

848
		wake_up_interruptible(&port->port.delta_msr_wait);
849 850 851 852 853 854 855 856 857 858
	}
}

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;

859
	/* May be called from qt2_process_read_urb() for an unbound port. */
860
	port_priv = usb_get_serial_port_data(port);
861 862
	if (!port_priv)
		return;
863 864 865 866 867 868 869 870

	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);

871
	icount = &port->icount;
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933

	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);
934
	if (port_priv->urb_in_use) {
935
		dev_err(&port->dev, "qt2_write - urb is in use\n");
936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
		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,
975 976
	.port_probe          = qt2_port_probe,
	.port_remove         = qt2_port_remove,
977 978 979 980
	.dtr_rts             = qt2_dtr_rts,
	.break_ctl           = qt2_break_ctl,
	.tiocmget            = qt2_tiocmget,
	.tiocmset            = qt2_tiocmset,
981
	.tiocmiwait          = usb_serial_generic_tiocmiwait,
982
	.get_icount	     = usb_serial_generic_get_icount,
983
	.get_serial          = get_serial_info,
984 985 986 987 988 989 990 991 992 993
	.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);
994
MODULE_LICENSE("GPL v2");