[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / drivers / usb / serial / ssu100.c

/*
 * usb-serial driver for Quatech SSU-100
 *
 * based on ftdi_sio.c and the original serqt_usb.c from Quatech
 *
 */

#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>

#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_GET_SET_UART             0xc1
#define QT_TRANSFER_IN              0xc0
#define QT_HW_FLOW_CONTROL_MASK     0xc5
#define QT_SW_FLOW_CONTROL_MASK     0xc6

#define  SERIAL_MSR_MASK            0xf0

#define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)

#define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)

#define  MAX_BAUD_RATE              460800

#define ATC_DISABLED                0x00
#define DUPMODE_BITS        0xc0
#define RR_BITS             0x03
#define LOOPMODE_BITS       0x41
#define RS232_MODE          0x00
#define RTSCTS_TO_CONNECTOR 0x40
#define CLKS_X4             0x02
#define FULLPWRBIT          0x00000080
#define NEXT_BOARD_POWER_BIT        0x00000004

static bool debug;

/* Version Information */
#define DRIVER_VERSION "v0.1"
#define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"

#define	USB_VENDOR_ID_QUATECH	0x061d	/* Quatech VID */
#define QUATECH_SSU100	0xC020	/* SSU100 */

static const struct usb_device_id id_table[] = {
	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
	{}			/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);


static struct usb_driver ssu100_driver = {
	.name			       = "ssu100",
	.probe			       = usb_serial_probe,
	.disconnect		       = usb_serial_disconnect,
	.id_table		       = id_table,
	.suspend		       = usb_serial_suspend,
	.resume			       = usb_serial_resume,
	.supports_autosuspend	       = 1,
};

struct ssu100_port_private {
	spinlock_t status_lock;
	u8 shadowLSR;
	u8 shadowMSR;
	wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
	struct async_icount icount;
};

static void ssu100_release(struct usb_serial *serial)
{
	struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);

	dbg("%s", __func__);
	kfree(priv);
}

static inline int ssu100_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, 300);
}

static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
{
	u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));

	return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
}


static inline int ssu100_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, 300);
}

static inline int ssu100_getregister(struct usb_device *dev,
				     unsigned short uart,
				     unsigned short reg,
				     u8 *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			       QT_SET_GET_REGISTER, 0xc0, reg,
			       uart, data, sizeof(*data), 300);

}


static inline int ssu100_setregister(struct usb_device *dev,
				     unsigned short uart,
				     unsigned short 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, 300);

}

#define set_mctrl(dev, set)		update_mctrl((dev), (set), 0)
#define clear_mctrl(dev, clear)	update_mctrl((dev), 0, (clear))

/* these do not deal with device that have more than 1 port */
static inline int update_mctrl(struct usb_device *dev, unsigned int set,
			       unsigned int clear)
{
	unsigned urb_value;
	int result;

	if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
		dbg("%s - DTR|RTS not being set|cleared", __func__);
		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;

	result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
	if (result < 0)
		dbg("%s Error from MODEM_CTRL urb", __func__);

	return result;
}

static int ssu100_initdevice(struct usb_device *dev)
{
	u8 *data;
	int result = 0;

	dbg("%s", __func__);

	data = kzalloc(3, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	result = ssu100_getdevice(dev, data);
	if (result < 0) {
		dbg("%s - get_device failed %i", __func__, result);
		goto out;
	}

	data[1] &= ~FULLPWRBIT;

	result = ssu100_setdevice(dev, data);
	if (result < 0) {
		dbg("%s - setdevice failed %i", __func__, result);
		goto out;
	}

	result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
	if (result < 0) {
		dbg("%s - set prebuffer level failed %i", __func__, result);
		goto out;
	}

	result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
	if (result < 0) {
		dbg("%s - set ATFprebuffer level failed %i", __func__, result);
		goto out;
	}

	result = ssu100_getdevice(dev, data);
	if (result < 0) {
		dbg("%s - get_device failed %i", __func__, result);
		goto out;
	}

	data[0] &= ~(RR_BITS | DUPMODE_BITS);
	data[0] |= CLKS_X4;
	data[1] &= ~(LOOPMODE_BITS);
	data[1] |= RS232_MODE;

	result = ssu100_setdevice(dev, data);
	if (result < 0) {
		dbg("%s - setdevice failed %i", __func__, result);
		goto out;
	}

out:	kfree(data);
	return result;

}


static void ssu100_set_termios(struct tty_struct *tty,
			       struct usb_serial_port *port,
			       struct ktermios *old_termios)
{
	struct usb_device *dev = port->serial->dev;
	struct ktermios *termios = tty->termios;
	u16 baud, divisor, remainder;
	unsigned int cflag = termios->c_cflag;
	u16 urb_value = 0; /* will hold the new flags */
	int result;

	dbg("%s", __func__);

	if (cflag & PARENB) {
		if (cflag & PARODD)
			urb_value |= UART_LCR_PARITY;
		else
			urb_value |= SERIAL_EVEN_PARITY;
	}

	switch (cflag & CSIZE) {
	case CS5:
		urb_value |= UART_LCR_WLEN5;
		break;
	case CS6:
		urb_value |= UART_LCR_WLEN6;
		break;
	case CS7:
		urb_value |= UART_LCR_WLEN7;
		break;
	default:
	case CS8:
		urb_value |= UART_LCR_WLEN8;
		break;
	}

	baud = tty_get_baud_rate(tty);
	if (!baud)
		baud = 9600;

	dbg("%s - got baud = %d\n", __func__, baud);


	divisor = MAX_BAUD_RATE / baud;
	remainder = MAX_BAUD_RATE % baud;
	if (((remainder * 2) >= baud) && (baud != 110))
		divisor++;

	urb_value = urb_value << 8;

	result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
	if (result < 0)
		dbg("%s - set uart failed", __func__);

	if (cflag & CRTSCTS)
		result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
					    SERIAL_CRTSCTS, 0);
	else
		result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
					    0, 0);
	if (result < 0)
		dbg("%s - set HW flow control failed", __func__);

	if (I_IXOFF(tty) || I_IXON(tty)) {
		u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));

		result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
					    x, 0);
	} else
		result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
					    0, 0);

	if (result < 0)
		dbg("%s - set SW flow control failed", __func__);

}


static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct usb_device *dev = port->serial->dev;
	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	u8 *data;
	int result;
	unsigned long flags;

	dbg("%s - port %d", __func__, port->number);

	data = kzalloc(2, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
				 QT_OPEN_CLOSE_CHANNEL,
				 QT_TRANSFER_IN, 0x01,
				 0, data, 2, 300);
	if (result < 0) {
		dbg("%s - open failed %i", __func__, result);
		kfree(data);
		return result;
	}

	spin_lock_irqsave(&priv->status_lock, flags);
	priv->shadowLSR = data[0];
	priv->shadowMSR = data[1];
	spin_unlock_irqrestore(&priv->status_lock, flags);

	kfree(data);

/* set to 9600 */
	result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
	if (result < 0)
		dbg("%s - set uart failed", __func__);

	if (tty)
		ssu100_set_termios(tty, port, tty->termios);

	return usb_serial_generic_open(tty, port);
}

static void ssu100_close(struct usb_serial_port *port)
{
	dbg("%s", __func__);
	usb_serial_generic_close(port);
}

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 ssu100_port_private *priv = usb_get_serial_port_data(port);
	struct async_icount prev, cur;
	unsigned long flags;

	spin_lock_irqsave(&priv->status_lock, flags);
	prev = priv->icount;
	spin_unlock_irqrestore(&priv->status_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->status_lock, flags);
		cur = priv->icount;
		spin_unlock_irqrestore(&priv->status_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 ssu100_get_icount(struct tty_struct *tty,
			struct serial_icounter_struct *icount)
{
	struct usb_serial_port *port = tty->driver_data;
	struct ssu100_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 ssu100_ioctl(struct tty_struct *tty,
		    unsigned int cmd, unsigned long arg)
{
	struct usb_serial_port *port = tty->driver_data;

	dbg("%s cmd 0x%04x", __func__, cmd);

	switch (cmd) {
	case TIOCGSERIAL:
		return get_serial_info(port,
				       (struct serial_struct __user *) arg);

	case TIOCMIWAIT:
		return wait_modem_info(port, arg);

	default:
		break;
	}

	dbg("%s arg not supported", __func__);

	return -ENOIOCTLCMD;
}

static int ssu100_attach(struct usb_serial *serial)
{
	struct ssu100_port_private *priv;
	struct usb_serial_port *port = *serial->port;

	dbg("%s", __func__);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
			sizeof(*priv));
		return -ENOMEM;
	}

	spin_lock_init(&priv->status_lock);
	init_waitqueue_head(&priv->delta_msr_wait);
	usb_set_serial_port_data(port, priv);

	return ssu100_initdevice(serial->dev);
}

static int ssu100_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_device *dev = port->serial->dev;
	u8 *d;
	int r;

	dbg("%s\n", __func__);

	d = kzalloc(2, GFP_KERNEL);
	if (!d)
		return -ENOMEM;

	r = ssu100_getregister(dev, 0, UART_MCR, d);
	if (r < 0)
		goto mget_out;

	r = ssu100_getregister(dev, 0, 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 ssu100_tiocmset(struct tty_struct *tty,
			   unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_device *dev = port->serial->dev;

	dbg("%s\n", __func__);
	return update_mctrl(dev, set, clear);
}

static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
{
	struct usb_device *dev = port->serial->dev;

	dbg("%s\n", __func__);

	mutex_lock(&port->serial->disc_mutex);
	if (!port->serial->disconnected) {
		/* Disable flow control */
		if (!on &&
		    ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
			dev_err(&port->dev, "error from flowcontrol urb\n");
		/* drop RTS and DTR */
		if (on)
			set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
		else
			clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
	}
	mutex_unlock(&port->serial->disc_mutex);
}

static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
{
	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	spin_lock_irqsave(&priv->status_lock, flags);
	priv->shadowMSR = msr;
	spin_unlock_irqrestore(&priv->status_lock, flags);

	if (msr & UART_MSR_ANY_DELTA) {
		/* update input line counters */
		if (msr & UART_MSR_DCTS)
			priv->icount.cts++;
		if (msr & UART_MSR_DDSR)
			priv->icount.dsr++;
		if (msr & UART_MSR_DDCD)
			priv->icount.dcd++;
		if (msr & UART_MSR_TERI)
			priv->icount.rng++;
		wake_up_interruptible(&priv->delta_msr_wait);
	}
}

static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
			      char *tty_flag)
{
	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	spin_lock_irqsave(&priv->status_lock, flags);
	priv->shadowLSR = lsr;
	spin_unlock_irqrestore(&priv->status_lock, flags);

	*tty_flag = TTY_NORMAL;
	if (lsr & UART_LSR_BRK_ERROR_BITS) {
		/* we always want to update icount, but we only want to
		 * update tty_flag for one case */
		if (lsr & UART_LSR_BI) {
			priv->icount.brk++;
			*tty_flag = TTY_BREAK;
			usb_serial_handle_break(port);
		}
		if (lsr & UART_LSR_PE) {
			priv->icount.parity++;
			if (*tty_flag == TTY_NORMAL)
				*tty_flag = TTY_PARITY;
		}
		if (lsr & UART_LSR_FE) {
			priv->icount.frame++;
			if (*tty_flag == TTY_NORMAL)
				*tty_flag = TTY_FRAME;
		}
		if (lsr & UART_LSR_OE){
			priv->icount.overrun++;
			if (*tty_flag == TTY_NORMAL)
				*tty_flag = TTY_OVERRUN;
		}
	}

}

static int ssu100_process_packet(struct urb *urb,
				 struct tty_struct *tty)
{
	struct usb_serial_port *port = urb->context;
	char *packet = (char *)urb->transfer_buffer;
	char flag = TTY_NORMAL;
	u32 len = urb->actual_length;
	int i;
	char *ch;

	dbg("%s - port %d", __func__, port->number);

	if ((len >= 4) &&
	    (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
	    ((packet[2] == 0x00) || (packet[2] == 0x01))) {
		if (packet[2] == 0x00) {
			ssu100_update_lsr(port, packet[3], &flag);
			if (flag == TTY_OVERRUN)
				tty_insert_flip_char(tty, 0, TTY_OVERRUN);
		}
		if (packet[2] == 0x01)
			ssu100_update_msr(port, packet[3]);

		len -= 4;
		ch = packet + 4;
	} else
		ch = packet;

	if (!len)
		return 0;	/* status only */

	if (port->port.console && port->sysrq) {
		for (i = 0; i < len; i++, ch++) {
			if (!usb_serial_handle_sysrq_char(port, *ch))
				tty_insert_flip_char(tty, *ch, flag);
		}
	} else
		tty_insert_flip_string_fixed_flag(tty, ch, flag, len);

	return len;
}

static void ssu100_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct tty_struct *tty;
	int count;

	dbg("%s", __func__);

	tty = tty_port_tty_get(&port->port);
	if (!tty)
		return;

	count = ssu100_process_packet(urb, tty);

	if (count)
		tty_flip_buffer_push(tty);
	tty_kref_put(tty);
}

static struct usb_serial_driver ssu100_device = {
	.driver = {
		.owner = THIS_MODULE,
		.name = "ssu100",
	},
	.description	     = DRIVER_DESC,
	.id_table	     = id_table,
	.num_ports	     = 1,
	.open		     = ssu100_open,
	.close		     = ssu100_close,
	.attach              = ssu100_attach,
	.release             = ssu100_release,
	.dtr_rts             = ssu100_dtr_rts,
	.process_read_urb    = ssu100_process_read_urb,
	.tiocmget            = ssu100_tiocmget,
	.tiocmset            = ssu100_tiocmset,
	.get_icount	     = ssu100_get_icount,
	.ioctl               = ssu100_ioctl,
	.set_termios         = ssu100_set_termios,
	.disconnect          = usb_serial_generic_disconnect,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&ssu100_device, NULL
};

module_usb_serial_driver(ssu100_driver, serial_drivers);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
Commit	Line	Data
52af9545 BP	1	/*
	2	* usb-serial driver for Quatech SSU-100
	3	*
	4	* based on ftdi_sio.c and the original serqt_usb.c from Quatech
	5	*
	6	*/
	7
	8	#include <linux/errno.h>
	9	#include <linux/init.h>
	10	#include <linux/slab.h>
	11	#include <linux/tty.h>
	12	#include <linux/tty_driver.h>
	13	#include <linux/tty_flip.h>
	14	#include <linux/module.h>
	15	#include <linux/serial.h>
	16	#include <linux/usb.h>
	17	#include <linux/usb/serial.h>
79f203a2	18	#include <linux/serial_reg.h>
52af9545 BP	19	#include <linux/uaccess.h>
	20
	21	#define QT_OPEN_CLOSE_CHANNEL 0xca
	22	#define QT_SET_GET_DEVICE 0xc2
	23	#define QT_SET_GET_REGISTER 0xc0
	24	#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
	25	#define QT_SET_ATF 0xcd
	26	#define QT_GET_SET_UART 0xc1
	27	#define QT_TRANSFER_IN 0xc0
	28	#define QT_HW_FLOW_CONTROL_MASK 0xc5
	29	#define QT_SW_FLOW_CONTROL_MASK 0xc6
	30
52af9545 BP	31	#define SERIAL_MSR_MASK 0xf0
52af9545 BP	32
79f203a2	33	#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) \| UART_MSR_CTS)
52af9545	34
79f203a2	35	#define SERIAL_EVEN_PARITY (UART_LCR_PARITY \| UART_LCR_EPAR)
52af9545 BP	36
	37	#define MAX_BAUD_RATE 460800
	38
	39	#define ATC_DISABLED 0x00
	40	#define DUPMODE_BITS 0xc0
	41	#define RR_BITS 0x03
	42	#define LOOPMODE_BITS 0x41
	43	#define RS232_MODE 0x00
	44	#define RTSCTS_TO_CONNECTOR 0x40
	45	#define CLKS_X4 0x02
	46	#define FULLPWRBIT 0x00000080
	47	#define NEXT_BOARD_POWER_BIT 0x00000004
	48
90ab5ee9	49	static bool debug;
52af9545 BP	50
	51	/* Version Information */
	52	#define DRIVER_VERSION "v0.1"
	53	#define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
	54
	55	#define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
	56	#define QUATECH_SSU100 0xC020 /* SSU100 */
	57
	58	static const struct usb_device_id id_table[] = {
	59	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
	60	{} /* Terminating entry */
	61	};
	62
	63	MODULE_DEVICE_TABLE(usb, id_table);
	64
	65
	66	static struct usb_driver ssu100_driver = {
	67	.name = "ssu100",
	68	.probe = usb_serial_probe,
	69	.disconnect = usb_serial_disconnect,
	70	.id_table = id_table,
	71	.suspend = usb_serial_suspend,
	72	.resume = usb_serial_resume,
52af9545 BP	73	.supports_autosuspend = 1,
	74	};
	75
	76	struct ssu100_port_private {
17523058	77	spinlock_t status_lock;
52af9545 BP	78	u8 shadowLSR;
	79	u8 shadowMSR;
	80	wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
f81c83db	81	struct async_icount icount;
52af9545 BP	82	};
	83
	84	static void ssu100_release(struct usb_serial *serial)
	85	{
	86	struct ssu100_port_private priv = usb_get_serial_port_data(serial->port);
	87
	88	dbg("%s", __func__);
	89	kfree(priv);
	90	}
	91
	92	static inline int ssu100_control_msg(struct usb_device *dev,
	93	u8 request, u16 data, u16 index)
	94	{
	95	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	96	request, 0x40, data, index,
	97	NULL, 0, 300);
	98	}
	99
	100	static inline int ssu100_setdevice(struct usb_device dev, u8 data)
	101	{
	102	u16 x = ((u16)(data[1] << 8) \| (u16)(data[0]));
	103
	104	return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
	105	}
	106
	107
	108	static inline int ssu100_getdevice(struct usb_device dev, u8 data)
	109	{
	110	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	111	QT_SET_GET_DEVICE, 0xc0, 0, 0,
	112	data, 3, 300);
	113	}
	114
	115	static inline int ssu100_getregister(struct usb_device *dev,
	116	unsigned short uart,
	117	unsigned short reg,
	118	u8 *data)
	119	{
	120	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	121	QT_SET_GET_REGISTER, 0xc0, reg,
	122	uart, data, sizeof(*data), 300);
	123
	124	}
	125
	126
	127	static inline int ssu100_setregister(struct usb_device *dev,
	128	unsigned short uart,
556f1a0e	129	unsigned short reg,
52af9545 BP	130	u16 data)
52af9545 BP	131	{
556f1a0e	132	u16 value = (data << 8) \| reg;
52af9545 BP	133
	134	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	135	QT_SET_GET_REGISTER, 0x40, value, uart,
	136	NULL, 0, 300);
	137
	138	}
	139
	140	#define set_mctrl(dev, set) update_mctrl((dev), (set), 0)
	141	#define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
	142
	143	/* these do not deal with device that have more than 1 port */
	144	static inline int update_mctrl(struct usb_device *dev, unsigned int set,
	145	unsigned int clear)
	146	{
	147	unsigned urb_value;
	148	int result;
	149
	150	if (((set \| clear) & (TIOCM_DTR \| TIOCM_RTS)) == 0) {
	151	dbg("%s - DTR\|RTS not being set\|cleared", __func__);
	152	return 0; /* no change */
	153	}
	154
	155	clear &= ~set; /* 'set' takes precedence over 'clear' */
	156	urb_value = 0;
	157	if (set & TIOCM_DTR)
79f203a2	158	urb_value \|= UART_MCR_DTR;
52af9545	159	if (set & TIOCM_RTS)
79f203a2	160	urb_value \|= UART_MCR_RTS;
52af9545	161
556f1a0e	162	result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
52af9545 BP	163	if (result < 0)
	164	dbg("%s Error from MODEM_CTRL urb", __func__);
	165
	166	return result;
	167	}
	168
	169	static int ssu100_initdevice(struct usb_device *dev)
	170	{
	171	u8 *data;
	172	int result = 0;
	173
	174	dbg("%s", __func__);
	175
	176	data = kzalloc(3, GFP_KERNEL);
	177	if (!data)
	178	return -ENOMEM;
	179
	180	result = ssu100_getdevice(dev, data);
	181	if (result < 0) {
	182	dbg("%s - get_device failed %i", __func__, result);
	183	goto out;
	184	}
	185
	186	data[1] &= ~FULLPWRBIT;
	187
	188	result = ssu100_setdevice(dev, data);
	189	if (result < 0) {
	190	dbg("%s - setdevice failed %i", __func__, result);
	191	goto out;
	192	}
	193
	194	result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
	195	if (result < 0) {
	196	dbg("%s - set prebuffer level failed %i", __func__, result);
	197	goto out;
	198	}
	199
	200	result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
	201	if (result < 0) {
	202	dbg("%s - set ATFprebuffer level failed %i", __func__, result);
	203	goto out;
	204	}
	205
	206	result = ssu100_getdevice(dev, data);
	207	if (result < 0) {
	208	dbg("%s - get_device failed %i", __func__, result);
	209	goto out;
	210	}
	211
	212	data[0] &= ~(RR_BITS \| DUPMODE_BITS);
	213	data[0] \|= CLKS_X4;
	214	data[1] &= ~(LOOPMODE_BITS);
	215	data[1] \|= RS232_MODE;
	216
	217	result = ssu100_setdevice(dev, data);
	218	if (result < 0) {
	219	dbg("%s - setdevice failed %i", __func__, result);
	220	goto out;
	221	}
	222
	223	out: kfree(data);
	224	return result;
	225
	226	}
227
228
229	static void ssu100_set_termios(struct tty_struct *tty,
230	struct usb_serial_port *port,
231	struct ktermios *old_termios)
232	{
233	struct usb_device *dev = port->serial->dev;
234	struct ktermios *termios = tty->termios;
235	u16 baud, divisor, remainder;
236	unsigned int cflag = termios->c_cflag;
237	u16 urb_value = 0; /* will hold the new flags */
238	int result;
239
240	dbg("%s", __func__);
241
242	if (cflag & PARENB) {
243	if (cflag & PARODD)
79f203a2	244	urb_value \|= UART_LCR_PARITY;
52af9545 BP	245	else
	246	urb_value \|= SERIAL_EVEN_PARITY;
	247	}
	248
	249	switch (cflag & CSIZE) {
	250	case CS5:
79f203a2	251	urb_value \|= UART_LCR_WLEN5;
52af9545 BP	252	break;
52af9545 BP	253	case CS6:
79f203a2	254	urb_value \|= UART_LCR_WLEN6;
52af9545 BP	255	break;
52af9545 BP	256	case CS7:
79f203a2	257	urb_value \|= UART_LCR_WLEN7;
52af9545 BP	258	break;
	259	default:
	260	case CS8:
79f203a2	261	urb_value \|= UART_LCR_WLEN8;
52af9545 BP	262	break;
	263	}
	264
	265	baud = tty_get_baud_rate(tty);
	266	if (!baud)
	267	baud = 9600;
	268
	269	dbg("%s - got baud = %d\n", __func__, baud);
	270
	271
	272	divisor = MAX_BAUD_RATE / baud;
	273	remainder = MAX_BAUD_RATE % baud;
	274	if (((remainder * 2) >= baud) && (baud != 110))
	275	divisor++;
	276
	277	urb_value = urb_value << 8;
	278
	279	result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
	280	if (result < 0)
	281	dbg("%s - set uart failed", __func__);
	282
	283	if (cflag & CRTSCTS)
	284	result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
	285	SERIAL_CRTSCTS, 0);
	286	else
	287	result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
	288	0, 0);
	289	if (result < 0)
	290	dbg("%s - set HW flow control failed", __func__);
	291
	292	if (I_IXOFF(tty) \|\| I_IXON(tty)) {
	293	u16 x = ((u16)(START_CHAR(tty) << 8) \| (u16)(STOP_CHAR(tty)));
	294
	295	result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
	296	x, 0);
	297	} else
	298	result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
	299	0, 0);
	300
	301	if (result < 0)
	302	dbg("%s - set SW flow control failed", __func__);
	303
	304	}
	305
	306
	307	static int ssu100_open(struct tty_struct tty, struct usb_serial_port port)
	308	{
	309	struct usb_device *dev = port->serial->dev;
	310	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	311	u8 *data;
	312	int result;
17523058	313	unsigned long flags;
52af9545 BP	314
	315	dbg("%s - port %d", __func__, port->number);
	316
	317	data = kzalloc(2, GFP_KERNEL);
	318	if (!data)
	319	return -ENOMEM;
	320
	321	result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	322	QT_OPEN_CLOSE_CHANNEL,
	323	QT_TRANSFER_IN, 0x01,
	324	0, data, 2, 300);
	325	if (result < 0) {
	326	dbg("%s - open failed %i", __func__, result);
	327	kfree(data);
	328	return result;
	329	}
	330
17523058	331	spin_lock_irqsave(&priv->status_lock, flags);
f81c83db BP	332	priv->shadowLSR = data[0];
f81c83db BP	333	priv->shadowMSR = data[1];
17523058	334	spin_unlock_irqrestore(&priv->status_lock, flags);
52af9545 BP	335
	336	kfree(data);
	337
	338	/* set to 9600 */
	339	result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
	340	if (result < 0)
	341	dbg("%s - set uart failed", __func__);
	342
	343	if (tty)
	344	ssu100_set_termios(tty, port, tty->termios);
	345
	346	return usb_serial_generic_open(tty, port);
	347	}
	348
	349	static void ssu100_close(struct usb_serial_port *port)
	350	{
	351	dbg("%s", __func__);
	352	usb_serial_generic_close(port);
	353	}
	354
	355	static int get_serial_info(struct usb_serial_port *port,
	356	struct serial_struct __user *retinfo)
	357	{
	358	struct serial_struct tmp;
	359
	360	if (!retinfo)
	361	return -EFAULT;
	362
	363	memset(&tmp, 0, sizeof(tmp));
	364	tmp.line = port->serial->minor;
	365	tmp.port = 0;
	366	tmp.irq = 0;
	367	tmp.flags = ASYNC_SKIP_TEST \| ASYNC_AUTO_IRQ;
	368	tmp.xmit_fifo_size = port->bulk_out_size;
	369	tmp.baud_base = 9600;
	370	tmp.close_delay = 5*HZ;
	371	tmp.closing_wait = 30*HZ;
	372
	373	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
	374	return -EFAULT;
	375	return 0;
	376	}
	377
f81c83db BP	378	static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
	379	{
	380	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	381	struct async_icount prev, cur;
	382	unsigned long flags;
	383
	384	spin_lock_irqsave(&priv->status_lock, flags);
	385	prev = priv->icount;
	386	spin_unlock_irqrestore(&priv->status_lock, flags);
	387
	388	while (1) {
	389	wait_event_interruptible(priv->delta_msr_wait,
	390	((priv->icount.rng != prev.rng) \|\|
	391	(priv->icount.dsr != prev.dsr) \|\|
	392	(priv->icount.dcd != prev.dcd) \|\|
	393	(priv->icount.cts != prev.cts)));
	394
	395	if (signal_pending(current))
	396	return -ERESTARTSYS;
	397
	398	spin_lock_irqsave(&priv->status_lock, flags);
	399	cur = priv->icount;
	400	spin_unlock_irqrestore(&priv->status_lock, flags);
	401
	402	if ((prev.rng == cur.rng) &&
	403	(prev.dsr == cur.dsr) &&
	404	(prev.dcd == cur.dcd) &&
	405	(prev.cts == cur.cts))
	406	return -EIO;
	407
	408	if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) \|\|
	409	(arg & TIOCM_DSR && (prev.dsr != cur.dsr)) \|\|
	410	(arg & TIOCM_CD && (prev.dcd != cur.dcd)) \|\|
	411	(arg & TIOCM_CTS && (prev.cts != cur.cts)))
	412	return 0;
	413	}
	414	return 0;
	415	}
	416
0bca1b91 AC	417	static int ssu100_get_icount(struct tty_struct *tty,
	418	struct serial_icounter_struct *icount)
	419	{
	420	struct usb_serial_port *port = tty->driver_data;
	421	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	422	struct async_icount cnow = priv->icount;
	423
	424	icount->cts = cnow.cts;
	425	icount->dsr = cnow.dsr;
	426	icount->rng = cnow.rng;
	427	icount->dcd = cnow.dcd;
	428	icount->rx = cnow.rx;
	429	icount->tx = cnow.tx;
	430	icount->frame = cnow.frame;
	431	icount->overrun = cnow.overrun;
	432	icount->parity = cnow.parity;
	433	icount->brk = cnow.brk;
	434	icount->buf_overrun = cnow.buf_overrun;
	435
	436	return 0;
	437	}
	438
	439
	440
00a0d0d6	441	static int ssu100_ioctl(struct tty_struct *tty,
52af9545 BP	442	unsigned int cmd, unsigned long arg)
	443	{
	444	struct usb_serial_port *port = tty->driver_data;
52af9545 BP	445
	446	dbg("%s cmd 0x%04x", __func__, cmd);
	447
	448	switch (cmd) {
	449	case TIOCGSERIAL:
	450	return get_serial_info(port,
	451	(struct serial_struct __user *) arg);
	452
	453	case TIOCMIWAIT:
f81c83db BP	454	return wait_modem_info(port, arg);
f81c83db BP	455
52af9545 BP	456	default:
	457	break;
	458	}
	459
	460	dbg("%s arg not supported", __func__);
	461
	462	return -ENOIOCTLCMD;
	463	}
	464
52af9545 BP	465	static int ssu100_attach(struct usb_serial *serial)
	466	{
	467	struct ssu100_port_private *priv;
	468	struct usb_serial_port port = serial->port;
	469
	470	dbg("%s", __func__);
	471
	472	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	473	if (!priv) {
	474	dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
	475	sizeof(*priv));
	476	return -ENOMEM;
	477	}
	478
17523058	479	spin_lock_init(&priv->status_lock);
52af9545 BP	480	init_waitqueue_head(&priv->delta_msr_wait);
52af9545 BP	481	usb_set_serial_port_data(port, priv);
52af9545 BP	482
	483	return ssu100_initdevice(serial->dev);
	484	}
	485
60b33c13	486	static int ssu100_tiocmget(struct tty_struct *tty)
52af9545 BP	487	{
	488	struct usb_serial_port *port = tty->driver_data;
	489	struct usb_device *dev = port->serial->dev;
	490	u8 *d;
	491	int r;
	492
	493	dbg("%s\n", __func__);
	494
	495	d = kzalloc(2, GFP_KERNEL);
	496	if (!d)
	497	return -ENOMEM;
	498
79f203a2	499	r = ssu100_getregister(dev, 0, UART_MCR, d);
52af9545 BP	500	if (r < 0)
	501	goto mget_out;
	502
79f203a2	503	r = ssu100_getregister(dev, 0, UART_MSR, d+1);
52af9545 BP	504	if (r < 0)
	505	goto mget_out;
	506
79f203a2 BP	507	r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) \|
	508	(d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) \|
	509	(d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) \|
	510	(d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) \|
	511	(d[1] & UART_MSR_RI ? TIOCM_RI : 0) \|
	512	(d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
52af9545 BP	513
	514	mget_out:
	515	kfree(d);
	516	return r;
	517	}
	518
20b9d177	519	static int ssu100_tiocmset(struct tty_struct *tty,
52af9545 BP	520	unsigned int set, unsigned int clear)
	521	{
	522	struct usb_serial_port *port = tty->driver_data;
	523	struct usb_device *dev = port->serial->dev;
	524
	525	dbg("%s\n", __func__);
	526	return update_mctrl(dev, set, clear);
	527	}
	528
	529	static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
	530	{
	531	struct usb_device *dev = port->serial->dev;
	532
	533	dbg("%s\n", __func__);
	534
	535	mutex_lock(&port->serial->disc_mutex);
	536	if (!port->serial->disconnected) {
	537	/* Disable flow control */
	538	if (!on &&
556f1a0e	539	ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
52af9545 BP	540	dev_err(&port->dev, "error from flowcontrol urb\n");
	541	/* drop RTS and DTR */
	542	if (on)
	543	set_mctrl(dev, TIOCM_DTR \| TIOCM_RTS);
	544	else
	545	clear_mctrl(dev, TIOCM_DTR \| TIOCM_RTS);
	546	}
	547	mutex_unlock(&port->serial->disc_mutex);
	548	}
	549
f81c83db BP	550	static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
	551	{
	552	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	553	unsigned long flags;
	554
	555	spin_lock_irqsave(&priv->status_lock, flags);
	556	priv->shadowMSR = msr;
	557	spin_unlock_irqrestore(&priv->status_lock, flags);
	558
	559	if (msr & UART_MSR_ANY_DELTA) {
	560	/* update input line counters */
	561	if (msr & UART_MSR_DCTS)
	562	priv->icount.cts++;
	563	if (msr & UART_MSR_DDSR)
	564	priv->icount.dsr++;
	565	if (msr & UART_MSR_DDCD)
	566	priv->icount.dcd++;
	567	if (msr & UART_MSR_TERI)
	568	priv->icount.rng++;
	569	wake_up_interruptible(&priv->delta_msr_wait);
	570	}
	571	}
	572
6b8f1ca5 BP	573	static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
6b8f1ca5 BP	574	char *tty_flag)
f81c83db BP	575	{
	576	struct ssu100_port_private *priv = usb_get_serial_port_data(port);
	577	unsigned long flags;
	578
	579	spin_lock_irqsave(&priv->status_lock, flags);
	580	priv->shadowLSR = lsr;
	581	spin_unlock_irqrestore(&priv->status_lock, flags);
	582
6b8f1ca5	583	*tty_flag = TTY_NORMAL;
f81c83db	584	if (lsr & UART_LSR_BRK_ERROR_BITS) {
6b8f1ca5 BP	585	/* we always want to update icount, but we only want to
	586	* update tty_flag for one case */
	587	if (lsr & UART_LSR_BI) {
f81c83db	588	priv->icount.brk++;
6b8f1ca5 BP	589	*tty_flag = TTY_BREAK;
	590	usb_serial_handle_break(port);
	591	}
	592	if (lsr & UART_LSR_PE) {
f81c83db	593	priv->icount.parity++;
6b8f1ca5 BP	594	if (*tty_flag == TTY_NORMAL)
	595	*tty_flag = TTY_PARITY;
	596	}
	597	if (lsr & UART_LSR_FE) {
	598	priv->icount.frame++;
	599	if (*tty_flag == TTY_NORMAL)
	600	*tty_flag = TTY_FRAME;
	601	}
	602	if (lsr & UART_LSR_OE){
f81c83db	603	priv->icount.overrun++;
6b8f1ca5 BP	604	if (*tty_flag == TTY_NORMAL)
	605	*tty_flag = TTY_OVERRUN;
	606	}
f81c83db	607	}
6b8f1ca5	608
f81c83db BP	609	}
f81c83db BP	610
f7043ecb BP	611	static int ssu100_process_packet(struct urb *urb,
f7043ecb BP	612	struct tty_struct *tty)
52af9545	613	{
f7043ecb BP	614	struct usb_serial_port *port = urb->context;
f7043ecb BP	615	char packet = (char )urb->transfer_buffer;
6b8f1ca5	616	char flag = TTY_NORMAL;
f7043ecb BP	617	u32 len = urb->actual_length;
f7043ecb BP	618	int i;
52af9545 BP	619	char *ch;
	620
	621	dbg("%s - port %d", __func__, port->number);
	622
9b2cef31 BP	623	if ((len >= 4) &&
9b2cef31 BP	624	(packet[0] == 0x1b) && (packet[1] == 0x1b) &&
52af9545	625	((packet[2] == 0x00) \|\| (packet[2] == 0x01))) {
6b8f1ca5 BP	626	if (packet[2] == 0x00) {
	627	ssu100_update_lsr(port, packet[3], &flag);
	628	if (flag == TTY_OVERRUN)
	629	tty_insert_flip_char(tty, 0, TTY_OVERRUN);
	630	}
f81c83db BP	631	if (packet[2] == 0x01)
f81c83db BP	632	ssu100_update_msr(port, packet[3]);
52af9545 BP	633
	634	len -= 4;
	635	ch = packet + 4;
	636	} else
	637	ch = packet;
	638
	639	if (!len)
	640	return 0; /* status only */
	641
	642	if (port->port.console && port->sysrq) {
	643	for (i = 0; i < len; i++, ch++) {
6ee9f4b4	644	if (!usb_serial_handle_sysrq_char(port, *ch))
52af9545 BP	645	tty_insert_flip_char(tty, *ch, flag);
	646	}
	647	} else
	648	tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
	649
	650	return len;
	651	}
	652
	653	static void ssu100_process_read_urb(struct urb *urb)
	654	{
	655	struct usb_serial_port *port = urb->context;
52af9545	656	struct tty_struct *tty;
f7043ecb	657	int count;
52af9545 BP	658
	659	dbg("%s", __func__);
	660
	661	tty = tty_port_tty_get(&port->port);
	662	if (!tty)
	663	return;
	664
f7043ecb	665	count = ssu100_process_packet(urb, tty);
52af9545 BP	666
	667	if (count)
	668	tty_flip_buffer_push(tty);
	669	tty_kref_put(tty);
	670	}
	671
52af9545 BP	672	static struct usb_serial_driver ssu100_device = {
	673	.driver = {
	674	.owner = THIS_MODULE,
	675	.name = "ssu100",
	676	},
	677	.description = DRIVER_DESC,
	678	.id_table = id_table,
52af9545	679	.num_ports = 1,
52af9545 BP	680	.open = ssu100_open,
	681	.close = ssu100_close,
	682	.attach = ssu100_attach,
	683	.release = ssu100_release,
	684	.dtr_rts = ssu100_dtr_rts,
	685	.process_read_urb = ssu100_process_read_urb,
	686	.tiocmget = ssu100_tiocmget,
	687	.tiocmset = ssu100_tiocmset,
0bca1b91	688	.get_icount = ssu100_get_icount,
52af9545 BP	689	.ioctl = ssu100_ioctl,
52af9545 BP	690	.set_termios = ssu100_set_termios,
85dee135	691	.disconnect = usb_serial_generic_disconnect,
52af9545 BP	692	};
52af9545 BP	693
d860322f AS	694	static struct usb_serial_driver * const serial_drivers[] = {
	695	&ssu100_device, NULL
	696	};
	697
3a674607	698	module_usb_serial_driver(ssu100_driver, serial_drivers);
52af9545 BP	699
	700	MODULE_DESCRIPTION(DRIVER_DESC);
	701	MODULE_LICENSE("GPL");
	702
	703	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	704	MODULE_PARM_DESC(debug, "Debug enabled or not");