[mirror_ubuntu-bionic-kernel.git] / drivers / usb / serial / kl5kusb105.c

/*
 * KLSI KL5KUSB105 chip RS232 converter driver
 *
 *   Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
 *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * All information about the device was acquired using SniffUSB ans snoopUSB
 * on Windows98.
 * It was written out of frustration with the PalmConnect USB Serial adapter
 * sold by Palm Inc.
 * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
 * information that was not already available.
 *
 * It seems that KLSI bought some silicon-design information from ScanLogic,
 * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
 * KLSI has firmware available for their devices; it is probable that the
 * firmware differs from that used by KLSI in their products. If you have an
 * original KLSI device and can provide some information on it, I would be
 * most interested in adding support for it here. If you have any information
 * on the protocol used (or find errors in my reverse-engineered stuff), please
 * let me know.
 *
 * The code was only tested with a PalmConnect USB adapter; if you
 * are adventurous, try it with any KLSI-based device and let me know how it
 * breaks so that I can fix it!
 */

/* TODO:
 *	check modem line signals
 *	implement handshaking or decide that we do not support it
 */

#include <linux/kernel.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/uaccess.h>
#include <asm/unaligned.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "kl5kusb105.h"

#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"


/*
 * Function prototypes
 */
static int klsi_105_port_probe(struct usb_serial_port *port);
static int klsi_105_port_remove(struct usb_serial_port *port);
static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
static void klsi_105_close(struct usb_serial_port *port);
static void klsi_105_set_termios(struct tty_struct *tty,
			struct usb_serial_port *port, struct ktermios *old);
static int  klsi_105_tiocmget(struct tty_struct *tty);
static void klsi_105_process_read_urb(struct urb *urb);
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
						void *dest, size_t size);

/*
 * All of the device info needed for the KLSI converters.
 */
static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
	{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
	{ }		/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_serial_driver kl5kusb105d_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"kl5kusb105d",
	},
	.description =		"KL5KUSB105D / PalmConnect",
	.id_table =		id_table,
	.num_ports =		1,
	.bulk_out_size =	64,
	.open =			klsi_105_open,
	.close =		klsi_105_close,
	.set_termios =		klsi_105_set_termios,
	/*.break_ctl =		klsi_105_break_ctl,*/
	.tiocmget =		klsi_105_tiocmget,
	.port_probe =		klsi_105_port_probe,
	.port_remove =		klsi_105_port_remove,
	.throttle =		usb_serial_generic_throttle,
	.unthrottle =		usb_serial_generic_unthrottle,
	.process_read_urb =	klsi_105_process_read_urb,
	.prepare_write_buffer =	klsi_105_prepare_write_buffer,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&kl5kusb105d_device, NULL
};

struct klsi_105_port_settings {
	__u8	pktlen;		/* always 5, it seems */
	__u8	baudrate;
	__u8	databits;
	__u8	unknown1;
	__u8	unknown2;
} __attribute__ ((packed));

struct klsi_105_private {
	struct klsi_105_port_settings	cfg;
	struct ktermios			termios;
	unsigned long			line_state; /* modem line settings */
	spinlock_t			lock;
};


/*
 * Handle vendor specific USB requests
 */


#define KLSI_TIMEOUT	 5000 /* default urb timeout */

static int klsi_105_chg_port_settings(struct usb_serial_port *port,
				      struct klsi_105_port_settings *settings)
{
	int rc;

	rc = usb_control_msg(port->serial->dev,
			usb_sndctrlpipe(port->serial->dev, 0),
			KL5KUSB105A_SIO_SET_DATA,
			USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
			0, /* value */
			0, /* index */
			settings,
			sizeof(struct klsi_105_port_settings),
			KLSI_TIMEOUT);
	if (rc < 0)
		dev_err(&port->dev,
			"Change port settings failed (error = %d)\n", rc);
	dev_info(&port->serial->dev->dev,
		 "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
		 settings->pktlen, settings->baudrate, settings->databits,
		 settings->unknown1, settings->unknown2);
	return rc;
}

/* translate a 16-bit status value from the device to linux's TIO bits */
static unsigned long klsi_105_status2linestate(const __u16 status)
{
	unsigned long res = 0;

	res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
	      | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
	      ;

	return res;
}

/*
 * Read line control via vendor command and return result through
 * *line_state_p
 */
/* It seems that the status buffer has always only 2 bytes length */
#define KLSI_STATUSBUF_LEN	2
static int klsi_105_get_line_state(struct usb_serial_port *port,
				   unsigned long *line_state_p)
{
	int rc;
	u8 *status_buf;
	__u16 status;

	dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");

	status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
	if (!status_buf)
		return -ENOMEM;

	status_buf[0] = 0xff;
	status_buf[1] = 0xff;
	rc = usb_control_msg(port->serial->dev,
			     usb_rcvctrlpipe(port->serial->dev, 0),
			     KL5KUSB105A_SIO_POLL,
			     USB_TYPE_VENDOR | USB_DIR_IN,
			     0, /* value */
			     0, /* index */
			     status_buf, KLSI_STATUSBUF_LEN,
			     10000
			     );
	if (rc < 0)
		dev_err(&port->dev, "Reading line status failed (error = %d)\n",
			rc);
	else {
		status = get_unaligned_le16(status_buf);

		dev_info(&port->serial->dev->dev, "read status %x %x\n",
			 status_buf[0], status_buf[1]);

		*line_state_p = klsi_105_status2linestate(status);
	}

	kfree(status_buf);
	return rc;
}


/*
 * Driver's tty interface functions
 */

static int klsi_105_port_probe(struct usb_serial_port *port)
{
	struct klsi_105_private *priv;

	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	/* set initial values for control structures */
	priv->cfg.pktlen    = 5;
	priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
	priv->cfg.databits  = kl5kusb105a_dtb_8;
	priv->cfg.unknown1  = 0;
	priv->cfg.unknown2  = 1;

	priv->line_state    = 0;

	spin_lock_init(&priv->lock);

	/* priv->termios is left uninitialized until port opening */

	usb_set_serial_port_data(port, priv);

	return 0;
}

static int klsi_105_port_remove(struct usb_serial_port *port)
{
	struct klsi_105_private *priv;

	priv = usb_get_serial_port_data(port);
	kfree(priv);

	return 0;
}

static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	int retval = 0;
	int rc;
	int i;
	unsigned long line_state;
	struct klsi_105_port_settings *cfg;
	unsigned long flags;

	/* Do a defined restart:
	 * Set up sane default baud rate and send the 'READ_ON'
	 * vendor command.
	 * FIXME: set modem line control (how?)
	 * Then read the modem line control and store values in
	 * priv->line_state.
	 */
	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	cfg->pktlen   = 5;
	cfg->baudrate = kl5kusb105a_sio_b9600;
	cfg->databits = kl5kusb105a_dtb_8;
	cfg->unknown1 = 0;
	cfg->unknown2 = 1;
	klsi_105_chg_port_settings(port, cfg);

	/* set up termios structure */
	spin_lock_irqsave(&priv->lock, flags);
	priv->termios.c_iflag = tty->termios.c_iflag;
	priv->termios.c_oflag = tty->termios.c_oflag;
	priv->termios.c_cflag = tty->termios.c_cflag;
	priv->termios.c_lflag = tty->termios.c_lflag;
	for (i = 0; i < NCCS; i++)
		priv->termios.c_cc[i] = tty->termios.c_cc[i];
	priv->cfg.pktlen   = cfg->pktlen;
	priv->cfg.baudrate = cfg->baudrate;
	priv->cfg.databits = cfg->databits;
	priv->cfg.unknown1 = cfg->unknown1;
	priv->cfg.unknown2 = cfg->unknown2;
	spin_unlock_irqrestore(&priv->lock, flags);

	/* READ_ON and urb submission */
	rc = usb_serial_generic_open(tty, port);
	if (rc) {
		retval = rc;
		goto exit;
	}

	rc = usb_control_msg(port->serial->dev,
			     usb_sndctrlpipe(port->serial->dev, 0),
			     KL5KUSB105A_SIO_CONFIGURE,
			     USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
			     KL5KUSB105A_SIO_CONFIGURE_READ_ON,
			     0, /* index */
			     NULL,
			     0,
			     KLSI_TIMEOUT);
	if (rc < 0) {
		dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
		retval = rc;
	} else
		dev_dbg(&port->dev, "%s - enabled reading\n", __func__);

	rc = klsi_105_get_line_state(port, &line_state);
	if (rc >= 0) {
		spin_lock_irqsave(&priv->lock, flags);
		priv->line_state = line_state;
		spin_unlock_irqrestore(&priv->lock, flags);
		dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
		retval = 0;
	} else
		retval = rc;

exit:
	kfree(cfg);
	return retval;
}

static void klsi_105_close(struct usb_serial_port *port)
{
	int rc;

	/* send READ_OFF */
	rc = usb_control_msg(port->serial->dev,
			     usb_sndctrlpipe(port->serial->dev, 0),
			     KL5KUSB105A_SIO_CONFIGURE,
			     USB_TYPE_VENDOR | USB_DIR_OUT,
			     KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
			     0, /* index */
			     NULL, 0,
			     KLSI_TIMEOUT);
	if (rc < 0)
		dev_err(&port->dev, "failed to disable read: %d\n", rc);

	/* shutdown our bulk reads and writes */
	usb_serial_generic_close(port);
}

/* We need to write a complete 64-byte data block and encode the
 * number actually sent in the first double-byte, LSB-order. That
 * leaves at most 62 bytes of payload.
 */
#define KLSI_HDR_LEN		2
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
						void *dest, size_t size)
{
	unsigned char *buf = dest;
	int count;

	count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
								&port->lock);
	put_unaligned_le16(count, buf);

	return count + KLSI_HDR_LEN;
}

/* The data received is preceded by a length double-byte in LSB-first order.
 */
static void klsi_105_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	unsigned len;

	/* empty urbs seem to happen, we ignore them */
	if (!urb->actual_length)
		return;

	if (urb->actual_length <= KLSI_HDR_LEN) {
		dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
		return;
	}

	len = get_unaligned_le16(data);
	if (len > urb->actual_length - KLSI_HDR_LEN) {
		dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
		len = urb->actual_length - KLSI_HDR_LEN;
	}

	tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
	tty_flip_buffer_push(&port->port);
}

static void klsi_105_set_termios(struct tty_struct *tty,
				 struct usb_serial_port *port,
				 struct ktermios *old_termios)
{
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	unsigned int iflag = tty->termios.c_iflag;
	unsigned int old_iflag = old_termios->c_iflag;
	unsigned int cflag = tty->termios.c_cflag;
	unsigned int old_cflag = old_termios->c_cflag;
	struct klsi_105_port_settings *cfg;
	unsigned long flags;
	speed_t baud;

	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
		return;

	/* lock while we are modifying the settings */
	spin_lock_irqsave(&priv->lock, flags);

	/*
	 * Update baud rate
	 */
	baud = tty_get_baud_rate(tty);

	if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
		/* reassert DTR and (maybe) RTS on transition from B0 */
		if ((old_cflag & CBAUD) == B0) {
			dev_dbg(dev, "%s: baud was B0\n", __func__);
#if 0
			priv->control_state |= TIOCM_DTR;
			/* don't set RTS if using hardware flow control */
			if (!(old_cflag & CRTSCTS))
				priv->control_state |= TIOCM_RTS;
			mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		}
	}
	switch (baud) {
	case 0: /* handled below */
		break;
	case 1200:
		priv->cfg.baudrate = kl5kusb105a_sio_b1200;
		break;
	case 2400:
		priv->cfg.baudrate = kl5kusb105a_sio_b2400;
		break;
	case 4800:
		priv->cfg.baudrate = kl5kusb105a_sio_b4800;
		break;
	case 9600:
		priv->cfg.baudrate = kl5kusb105a_sio_b9600;
		break;
	case 19200:
		priv->cfg.baudrate = kl5kusb105a_sio_b19200;
		break;
	case 38400:
		priv->cfg.baudrate = kl5kusb105a_sio_b38400;
		break;
	case 57600:
		priv->cfg.baudrate = kl5kusb105a_sio_b57600;
		break;
	case 115200:
		priv->cfg.baudrate = kl5kusb105a_sio_b115200;
		break;
	default:
		dev_dbg(dev, "unsupported baudrate, using 9600\n");
		priv->cfg.baudrate = kl5kusb105a_sio_b9600;
		baud = 9600;
		break;
	}
	if ((cflag & CBAUD) == B0) {
		dev_dbg(dev, "%s: baud is B0\n", __func__);
		/* Drop RTS and DTR */
		/* maybe this should be simulated by sending read
		 * disable and read enable messages?
		 */
#if 0
		priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
	}
	tty_encode_baud_rate(tty, baud, baud);

	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
		/* set the number of data bits */
		switch (cflag & CSIZE) {
		case CS5:
			dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
			spin_unlock_irqrestore(&priv->lock, flags);
			goto err;
		case CS6:
			dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
			spin_unlock_irqrestore(&priv->lock, flags);
			goto err;
		case CS7:
			priv->cfg.databits = kl5kusb105a_dtb_7;
			break;
		case CS8:
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		default:
			dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		}
	}

	/*
	 * Update line control register (LCR)
	 */
	if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
	    || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
		/* Not currently supported */
		tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
#if 0
		priv->last_lcr = 0;

		/* set the parity */
		if (cflag & PARENB)
			priv->last_lcr |= (cflag & PARODD) ?
				MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
		else
			priv->last_lcr |= MCT_U232_PARITY_NONE;

		/* set the number of stop bits */
		priv->last_lcr |= (cflag & CSTOPB) ?
			MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;

		mct_u232_set_line_ctrl(serial, priv->last_lcr);
#endif
	}
	/*
	 * Set flow control: well, I do not really now how to handle DTR/RTS.
	 * Just do what we have seen with SniffUSB on Win98.
	 */
	if ((iflag & IXOFF) != (old_iflag & IXOFF)
	    || (iflag & IXON) != (old_iflag & IXON)
	    ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
		/* Not currently supported */
		tty->termios.c_cflag &= ~CRTSCTS;
		/* Drop DTR/RTS if no flow control otherwise assert */
#if 0
		if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
			priv->control_state |= TIOCM_DTR | TIOCM_RTS;
		else
			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
	}
	memcpy(cfg, &priv->cfg, sizeof(*cfg));
	spin_unlock_irqrestore(&priv->lock, flags);

	/* now commit changes to device */
	klsi_105_chg_port_settings(port, cfg);
err:
	kfree(cfg);
}

#if 0
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	struct mct_u232_private *priv =
				(struct mct_u232_private *)port->private;
	unsigned char lcr = priv->last_lcr;

	dev_dbg(&port->dev, "%s - state=%d\n", __func__, break_state);

	/* LOCKING */
	if (break_state)
		lcr |= MCT_U232_SET_BREAK;

	mct_u232_set_line_ctrl(serial, lcr);
}
#endif

static int klsi_105_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int rc;
	unsigned long line_state;

	rc = klsi_105_get_line_state(port, &line_state);
	if (rc < 0) {
		dev_err(&port->dev,
			"Reading line control failed (error = %d)\n", rc);
		/* better return value? EAGAIN? */
		return rc;
	}

	spin_lock_irqsave(&priv->lock, flags);
	priv->line_state = line_state;
	spin_unlock_irqrestore(&priv->lock, flags);
	dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
	return (int)line_state;
}

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* KLSI KL5KUSB105 chip RS232 converter driver
	3	*
60b3013c	4	* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
1da177e4 LT	5	* Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* All information about the device was acquired using SniffUSB ans snoopUSB
	13	* on Windows98.
	14	* It was written out of frustration with the PalmConnect USB Serial adapter
	15	* sold by Palm Inc.
	16	* Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
	17	* information that was not already available.
	18	*
0c265f4e	19	* It seems that KLSI bought some silicon-design information from ScanLogic,
1da177e4 LT	20	* whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
	21	* KLSI has firmware available for their devices; it is probable that the
	22	* firmware differs from that used by KLSI in their products. If you have an
0c265f4e AC	23	* original KLSI device and can provide some information on it, I would be
0c265f4e AC	24	* most interested in adding support for it here. If you have any information
1da177e4 LT	25	* on the protocol used (or find errors in my reverse-engineered stuff), please
	26	* let me know.
	27	*
	28	* The code was only tested with a PalmConnect USB adapter; if you
	29	* are adventurous, try it with any KLSI-based device and let me know how it
	30	* breaks so that I can fix it!
	31	*/
	32
	33	/* TODO:
	34	* check modem line signals
	35	* implement handshaking or decide that we do not support it
	36	*/
	37
1da177e4 LT	38	#include <linux/kernel.h>
1da177e4 LT	39	#include <linux/errno.h>
1da177e4 LT	40	#include <linux/slab.h>
	41	#include <linux/tty.h>
	42	#include <linux/tty_driver.h>
	43	#include <linux/tty_flip.h>
	44	#include <linux/module.h>
0c265f4e	45	#include <linux/uaccess.h>
fd05e720	46	#include <asm/unaligned.h>
1da177e4	47	#include <linux/usb.h>
a969888c	48	#include <linux/usb/serial.h>
1da177e4 LT	49	#include "kl5kusb105.h"
1da177e4 LT	50
60b3013c	51	#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
1da177e4 LT	52	#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
	53
	54
	55	/*
	56	* Function prototypes
	57	*/
99a6f73c JH	58	static int klsi_105_port_probe(struct usb_serial_port *port);
99a6f73c JH	59	static int klsi_105_port_remove(struct usb_serial_port *port);
a509a7e4	60	static int klsi_105_open(struct tty_struct tty, struct usb_serial_port port);
335f8514	61	static void klsi_105_close(struct usb_serial_port *port);
0c265f4e AC	62	static void klsi_105_set_termios(struct tty_struct *tty,
0c265f4e AC	63	struct usb_serial_port port, struct ktermios old);
60b33c13	64	static int klsi_105_tiocmget(struct tty_struct *tty);
60b3013c JH	65	static void klsi_105_process_read_urb(struct urb *urb);
	66	static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
	67	void *dest, size_t size);
1da177e4 LT	68
	69	/*
	70	* All of the device info needed for the KLSI converters.
	71	*/
7d40d7e8	72	static const struct usb_device_id id_table[] = {
1da177e4 LT	73	{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
	74	{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
	75	{ } /* Terminating entry */
	76	};
	77
0c265f4e	78	MODULE_DEVICE_TABLE(usb, id_table);
1da177e4	79
ea65370d	80	static struct usb_serial_driver kl5kusb105d_device = {
18fcac35 GKH	81	.driver = {
18fcac35 GKH	82	.owner = THIS_MODULE,
269bda1c	83	.name = "kl5kusb105d",
18fcac35	84	},
ff8c195f	85	.description = "KL5KUSB105D / PalmConnect",
ff8c195f JH	86	.id_table = id_table,
ff8c195f JH	87	.num_ports = 1,
60b3013c	88	.bulk_out_size = 64,
ff8c195f JH	89	.open = klsi_105_open,
ff8c195f JH	90	.close = klsi_105_close,
ff8c195f JH	91	.set_termios = klsi_105_set_termios,
	92	/.break_ctl = klsi_105_break_ctl,/
	93	.tiocmget = klsi_105_tiocmget,
99a6f73c JH	94	.port_probe = klsi_105_port_probe,
99a6f73c JH	95	.port_remove = klsi_105_port_remove,
60b3013c JH	96	.throttle = usb_serial_generic_throttle,
	97	.unthrottle = usb_serial_generic_unthrottle,
	98	.process_read_urb = klsi_105_process_read_urb,
	99	.prepare_write_buffer = klsi_105_prepare_write_buffer,
1da177e4 LT	100	};
1da177e4 LT	101
4d2a7aff AS	102	static struct usb_serial_driver * const serial_drivers[] = {
	103	&kl5kusb105d_device, NULL
	104	};
	105
1da177e4 LT	106	struct klsi_105_port_settings {
	107	__u8 pktlen; /* always 5, it seems */
	108	__u8 baudrate;
	109	__u8 databits;
	110	__u8 unknown1;
	111	__u8 unknown2;
	112	} __attribute__ ((packed));
	113
1da177e4 LT	114	struct klsi_105_private {
1da177e4 LT	115	struct klsi_105_port_settings cfg;
606d099c	116	struct ktermios termios;
1da177e4	117	unsigned long line_state; /* modem line settings */
1da177e4	118	spinlock_t lock;
1da177e4 LT	119	};
	120
	121
	122	/*
	123	* Handle vendor specific USB requests
	124	*/
	125
	126
	127	#define KLSI_TIMEOUT 5000 /* default urb timeout */
	128
	129	static int klsi_105_chg_port_settings(struct usb_serial_port *port,
	130	struct klsi_105_port_settings *settings)
	131	{
	132	int rc;
	133
0c265f4e AC	134	rc = usb_control_msg(port->serial->dev,
	135	usb_sndctrlpipe(port->serial->dev, 0),
	136	KL5KUSB105A_SIO_SET_DATA,
	137	USB_TYPE_VENDOR \| USB_DIR_OUT \| USB_RECIP_INTERFACE,
	138	0, /* value */
	139	0, /* index */
	140	settings,
	141	sizeof(struct klsi_105_port_settings),
	142	KLSI_TIMEOUT);
1da177e4	143	if (rc < 0)
194343d9 GKH	144	dev_err(&port->dev,
194343d9 GKH	145	"Change port settings failed (error = %d)\n", rc);
c197a8db GKH	146	dev_info(&port->serial->dev->dev,
	147	"%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
	148	settings->pktlen, settings->baudrate, settings->databits,
	149	settings->unknown1, settings->unknown2);
0c265f4e	150	return rc;
ff8c195f	151	}
1da177e4 LT	152
	153	/* translate a 16-bit status value from the device to linux's TIO bits */
	154	static unsigned long klsi_105_status2linestate(const __u16 status)
	155	{
	156	unsigned long res = 0;
	157
	158	res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
	159	\| ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
	160	;
	161
	162	return res;
	163	}
ff8c195f	164
0c265f4e	165	/*
1da177e4	166	* Read line control via vendor command and return result through
0c265f4e	167	* *line_state_p
1da177e4 LT	168	*/
	169	/* It seems that the status buffer has always only 2 bytes length */
	170	#define KLSI_STATUSBUF_LEN 2
	171	static int klsi_105_get_line_state(struct usb_serial_port *port,
	172	unsigned long *line_state_p)
	173	{
	174	int rc;
abf492e7	175	u8 *status_buf;
1da177e4 LT	176	__u16 status;
1da177e4 LT	177
c197a8db	178	dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
abf492e7 JH	179
abf492e7 JH	180	status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
10c642d0	181	if (!status_buf)
abf492e7	182	return -ENOMEM;
10c642d0	183
abf492e7 JH	184	status_buf[0] = 0xff;
abf492e7 JH	185	status_buf[1] = 0xff;
0c265f4e	186	rc = usb_control_msg(port->serial->dev,
1da177e4 LT	187	usb_rcvctrlpipe(port->serial->dev, 0),
1da177e4 LT	188	KL5KUSB105A_SIO_POLL,
0c265f4e	189	USB_TYPE_VENDOR \| USB_DIR_IN,
1da177e4 LT	190	0, /* value */
	191	0, /* index */
	192	status_buf, KLSI_STATUSBUF_LEN,
	193	10000
	194	);
	195	if (rc < 0)
194343d9 GKH	196	dev_err(&port->dev, "Reading line status failed (error = %d)\n",
194343d9 GKH	197	rc);
1da177e4	198	else {
bd2c7845	199	status = get_unaligned_le16(status_buf);
1da177e4	200
d9a38a87	201	dev_info(&port->serial->dev->dev, "read status %x %x\n",
c197a8db	202	status_buf[0], status_buf[1]);
1da177e4 LT	203
	204	*line_state_p = klsi_105_status2linestate(status);
	205	}
abf492e7 JH	206
abf492e7 JH	207	kfree(status_buf);
0c265f4e	208	return rc;
1da177e4 LT	209	}
	210
	211
	212	/*
	213	* Driver's tty interface functions
	214	*/
	215
99a6f73c	216	static int klsi_105_port_probe(struct usb_serial_port *port)
1da177e4 LT	217	{
1da177e4 LT	218	struct klsi_105_private *priv;
1da177e4	219
99a6f73c JH	220	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
	221	if (!priv)
	222	return -ENOMEM;
1da177e4	223
99a6f73c JH	224	/* set initial values for control structures */
	225	priv->cfg.pktlen = 5;
	226	priv->cfg.baudrate = kl5kusb105a_sio_b9600;
	227	priv->cfg.databits = kl5kusb105a_dtb_8;
	228	priv->cfg.unknown1 = 0;
	229	priv->cfg.unknown2 = 1;
1da177e4	230
99a6f73c	231	priv->line_state = 0;
1da177e4	232
99a6f73c	233	spin_lock_init(&priv->lock);
1da177e4	234
99a6f73c	235	/* priv->termios is left uninitialized until port opening */
1da177e4	236
99a6f73c	237	usb_set_serial_port_data(port, priv);
0c265f4e	238
9306fff1	239	return 0;
ff8c195f	240	}
1da177e4	241
99a6f73c	242	static int klsi_105_port_remove(struct usb_serial_port *port)
f9c99bb8	243	{
99a6f73c	244	struct klsi_105_private *priv;
f9c99bb8	245
99a6f73c JH	246	priv = usb_get_serial_port_data(port);
	247	kfree(priv);
	248
	249	return 0;
ff8c195f	250	}
1da177e4	251
a509a7e4	252	static int klsi_105_open(struct tty_struct tty, struct usb_serial_port port)
1da177e4 LT	253	{
	254	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	255	int retval = 0;
	256	int rc;
	257	int i;
	258	unsigned long line_state;
abf492e7	259	struct klsi_105_port_settings *cfg;
1da177e4 LT	260	unsigned long flags;
1da177e4 LT	261
1da177e4 LT	262	/* Do a defined restart:
1da177e4 LT	263	* Set up sane default baud rate and send the 'READ_ON'
0c265f4e	264	* vendor command.
1da177e4 LT	265	* FIXME: set modem line control (how?)
	266	* Then read the modem line control and store values in
	267	* priv->line_state.
	268	*/
abf492e7	269	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
10c642d0	270	if (!cfg)
abf492e7	271	return -ENOMEM;
10c642d0	272
abf492e7 JH	273	cfg->pktlen = 5;
	274	cfg->baudrate = kl5kusb105a_sio_b9600;
	275	cfg->databits = kl5kusb105a_dtb_8;
	276	cfg->unknown1 = 0;
	277	cfg->unknown2 = 1;
	278	klsi_105_chg_port_settings(port, cfg);
0c265f4e	279
1da177e4	280	/* set up termios structure */
0c265f4e	281	spin_lock_irqsave(&priv->lock, flags);
adc8d746 AC	282	priv->termios.c_iflag = tty->termios.c_iflag;
	283	priv->termios.c_oflag = tty->termios.c_oflag;
	284	priv->termios.c_cflag = tty->termios.c_cflag;
	285	priv->termios.c_lflag = tty->termios.c_lflag;
0c265f4e	286	for (i = 0; i < NCCS; i++)
adc8d746	287	priv->termios.c_cc[i] = tty->termios.c_cc[i];
abf492e7 JH	288	priv->cfg.pktlen = cfg->pktlen;
	289	priv->cfg.baudrate = cfg->baudrate;
	290	priv->cfg.databits = cfg->databits;
	291	priv->cfg.unknown1 = cfg->unknown1;
	292	priv->cfg.unknown2 = cfg->unknown2;
0c265f4e	293	spin_unlock_irqrestore(&priv->lock, flags);
1da177e4 LT	294
1da177e4 LT	295	/* READ_ON and urb submission */
60b3013c	296	rc = usb_serial_generic_open(tty, port);
1da177e4	297	if (rc) {
1da177e4 LT	298	retval = rc;
	299	goto exit;
	300	}
	301
	302	rc = usb_control_msg(port->serial->dev,
0c265f4e	303	usb_sndctrlpipe(port->serial->dev, 0),
1da177e4 LT	304	KL5KUSB105A_SIO_CONFIGURE,
	305	USB_TYPE_VENDOR\|USB_DIR_OUT\|USB_RECIP_INTERFACE,
	306	KL5KUSB105A_SIO_CONFIGURE_READ_ON,
	307	0, /* index */
	308	NULL,
	309	0,
	310	KLSI_TIMEOUT);
	311	if (rc < 0) {
194343d9	312	dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
1da177e4	313	retval = rc;
0c265f4e	314	} else
1ad7604f	315	dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
1da177e4 LT	316
	317	rc = klsi_105_get_line_state(port, &line_state);
	318	if (rc >= 0) {
0c265f4e	319	spin_lock_irqsave(&priv->lock, flags);
1da177e4	320	priv->line_state = line_state;
0c265f4e	321	spin_unlock_irqrestore(&priv->lock, flags);
1ad7604f	322	dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
1da177e4 LT	323	retval = 0;
	324	} else
	325	retval = rc;
	326
	327	exit:
abf492e7	328	kfree(cfg);
1da177e4	329	return retval;
ff8c195f	330	}
1da177e4	331
335f8514	332	static void klsi_105_close(struct usb_serial_port *port)
1da177e4	333	{
1da177e4 LT	334	int rc;
1da177e4 LT	335
9fcb2e6e JH	336	/* send READ_OFF */
	337	rc = usb_control_msg(port->serial->dev,
	338	usb_sndctrlpipe(port->serial->dev, 0),
	339	KL5KUSB105A_SIO_CONFIGURE,
	340	USB_TYPE_VENDOR \| USB_DIR_OUT,
	341	KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
	342	0, /* index */
	343	NULL, 0,
	344	KLSI_TIMEOUT);
	345	if (rc < 0)
	346	dev_err(&port->dev, "failed to disable read: %d\n", rc);
1da177e4 LT	347
1da177e4 LT	348	/* shutdown our bulk reads and writes */
60b3013c	349	usb_serial_generic_close(port);
ff8c195f	350	}
1da177e4 LT	351
1da177e4 LT	352	/* We need to write a complete 64-byte data block and encode the
0c265f4e	353	* number actually sent in the first double-byte, LSB-order. That
1da177e4 LT	354	* leaves at most 62 bytes of payload.
1da177e4 LT	355	*/
60b3013c JH	356	#define KLSI_HDR_LEN 2
	357	static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
	358	void *dest, size_t size)
1da177e4	359	{
60b3013c JH	360	unsigned char *buf = dest;
60b3013c JH	361	int count;
17c1b35a	362
60b3013c JH	363	count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
	364	&port->lock);
	365	put_unaligned_le16(count, buf);
1da177e4	366
60b3013c	367	return count + KLSI_HDR_LEN;
ff8c195f	368	}
1da177e4	369
60b3013c JH	370	/* The data received is preceded by a length double-byte in LSB-first order.
	371	*/
	372	static void klsi_105_process_read_urb(struct urb *urb)
1da177e4	373	{
cdc97792	374	struct usb_serial_port *port = urb->context;
1da177e4	375	unsigned char *data = urb->transfer_buffer;
60b3013c	376	unsigned len;
1da177e4	377
60b3013c JH	378	/* empty urbs seem to happen, we ignore them */
	379	if (!urb->actual_length)
	380	return;
1da177e4	381
60b3013c	382	if (urb->actual_length <= KLSI_HDR_LEN) {
1ad7604f	383	dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
17c1b35a GKH	384	return;
	385	}
	386
60b3013c JH	387	len = get_unaligned_le16(data);
60b3013c JH	388	if (len > urb->actual_length - KLSI_HDR_LEN) {
1ad7604f	389	dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
60b3013c	390	len = urb->actual_length - KLSI_HDR_LEN;
1da177e4	391	}
60b3013c	392
05c7cd39	393	tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
2e124b4a	394	tty_flip_buffer_push(&port->port);
ff8c195f	395	}
1da177e4	396
0c265f4e AC	397	static void klsi_105_set_termios(struct tty_struct *tty,
	398	struct usb_serial_port *port,
	399	struct ktermios *old_termios)
1da177e4 LT	400	{
1da177e4 LT	401	struct klsi_105_private *priv = usb_get_serial_port_data(port);
1ad7604f	402	struct device *dev = &port->dev;
adc8d746	403	unsigned int iflag = tty->termios.c_iflag;
1da177e4	404	unsigned int old_iflag = old_termios->c_iflag;
adc8d746	405	unsigned int cflag = tty->termios.c_cflag;
1da177e4	406	unsigned int old_cflag = old_termios->c_cflag;
abf492e7	407	struct klsi_105_port_settings *cfg;
1da177e4	408	unsigned long flags;
a5b6f60c	409	speed_t baud;
0c265f4e	410
abf492e7	411	cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
10c642d0	412	if (!cfg)
abf492e7	413	return;
abf492e7	414
1da177e4	415	/* lock while we are modifying the settings */
0c265f4e AC	416	spin_lock_irqsave(&priv->lock, flags);
0c265f4e AC	417
1da177e4 LT	418	/*
	419	* Update baud rate
	420	*/
a5b6f60c AC	421	baud = tty_get_baud_rate(tty);
a5b6f60c AC	422
0c265f4e AC	423	if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
	424	/* reassert DTR and (maybe) RTS on transition from B0 */
	425	if ((old_cflag & CBAUD) == B0) {
1ad7604f	426	dev_dbg(dev, "%s: baud was B0\n", __func__);
1da177e4 LT	427	#if 0
	428	priv->control_state \|= TIOCM_DTR;
	429	/* don't set RTS if using hardware flow control */
0c265f4e	430	if (!(old_cflag & CRTSCTS))
1da177e4	431	priv->control_state \|= TIOCM_RTS;
1da177e4 LT	432	mct_u232_set_modem_ctrl(serial, priv->control_state);
	433	#endif
	434	}
a5b6f60c	435	}
0c265f4e AC	436	switch (baud) {
	437	case 0: /* handled below */
	438	break;
	439	case 1200:
	440	priv->cfg.baudrate = kl5kusb105a_sio_b1200;
	441	break;
	442	case 2400:
	443	priv->cfg.baudrate = kl5kusb105a_sio_b2400;
	444	break;
	445	case 4800:
	446	priv->cfg.baudrate = kl5kusb105a_sio_b4800;
	447	break;
	448	case 9600:
	449	priv->cfg.baudrate = kl5kusb105a_sio_b9600;
	450	break;
	451	case 19200:
	452	priv->cfg.baudrate = kl5kusb105a_sio_b19200;
	453	break;
	454	case 38400:
	455	priv->cfg.baudrate = kl5kusb105a_sio_b38400;
	456	break;
	457	case 57600:
	458	priv->cfg.baudrate = kl5kusb105a_sio_b57600;
	459	break;
	460	case 115200:
	461	priv->cfg.baudrate = kl5kusb105a_sio_b115200;
	462	break;
	463	default:
d9a38a87	464	dev_dbg(dev, "unsupported baudrate, using 9600\n");
1ad7604f	465	priv->cfg.baudrate = kl5kusb105a_sio_b9600;
0c265f4e AC	466	baud = 9600;
0c265f4e AC	467	break;
a5b6f60c	468	}
0c265f4e	469	if ((cflag & CBAUD) == B0) {
1ad7604f	470	dev_dbg(dev, "%s: baud is B0\n", __func__);
a5b6f60c AC	471	/* Drop RTS and DTR */
	472	/* maybe this should be simulated by sending read
	473	* disable and read enable messages?
	474	*/
1da177e4	475	#if 0
a5b6f60c	476	priv->control_state &= ~(TIOCM_DTR \| TIOCM_RTS);
0c265f4e	477	mct_u232_set_modem_ctrl(serial, priv->control_state);
1da177e4	478	#endif
1da177e4	479	}
a5b6f60c	480	tty_encode_baud_rate(tty, baud, baud);
1da177e4 LT	481
	482	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
	483	/* set the number of data bits */
	484	switch (cflag & CSIZE) {
	485	case CS5:
1ad7604f	486	dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
0c265f4e	487	spin_unlock_irqrestore(&priv->lock, flags);
abf492e7	488	goto err;
1da177e4	489	case CS6:
1ad7604f	490	dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
0c265f4e	491	spin_unlock_irqrestore(&priv->lock, flags);
abf492e7	492	goto err;
1da177e4 LT	493	case CS7:
	494	priv->cfg.databits = kl5kusb105a_dtb_7;
	495	break;
	496	case CS8:
	497	priv->cfg.databits = kl5kusb105a_dtb_8;
	498	break;
	499	default:
1ad7604f	500	dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
1da177e4 LT	501	priv->cfg.databits = kl5kusb105a_dtb_8;
	502	break;
	503	}
	504	}
	505
	506	/*
	507	* Update line control register (LCR)
	508	*/
	509	if ((cflag & (PARENB\|PARODD)) != (old_cflag & (PARENB\|PARODD))
0c265f4e	510	\|\| (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
a5b6f60c	511	/* Not currently supported */
adc8d746	512	tty->termios.c_cflag &= ~(PARENB\|PARODD\|CSTOPB);
1da177e4 LT	513	#if 0
	514	priv->last_lcr = 0;
	515
	516	/* set the parity */
	517	if (cflag & PARENB)
	518	priv->last_lcr \|= (cflag & PARODD) ?
	519	MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
	520	else
	521	priv->last_lcr \|= MCT_U232_PARITY_NONE;
	522
	523	/* set the number of stop bits */
	524	priv->last_lcr \|= (cflag & CSTOPB) ?
	525	MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
	526
	527	mct_u232_set_line_ctrl(serial, priv->last_lcr);
	528	#endif
1da177e4	529	}
1da177e4 LT	530	/*
	531	* Set flow control: well, I do not really now how to handle DTR/RTS.
	532	* Just do what we have seen with SniffUSB on Win98.
	533	*/
0c265f4e	534	if ((iflag & IXOFF) != (old_iflag & IXOFF)
1da177e4	535	\|\| (iflag & IXON) != (old_iflag & IXON)
0c265f4e	536	\|\| (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
a5b6f60c	537	/* Not currently supported */
adc8d746	538	tty->termios.c_cflag &= ~CRTSCTS;
1da177e4 LT	539	/* Drop DTR/RTS if no flow control otherwise assert */
1da177e4 LT	540	#if 0
0c265f4e	541	if ((iflag & IXOFF) \|\| (iflag & IXON) \|\| (cflag & CRTSCTS))
1da177e4 LT	542	priv->control_state \|= TIOCM_DTR \| TIOCM_RTS;
	543	else
	544	priv->control_state &= ~(TIOCM_DTR \| TIOCM_RTS);
	545	mct_u232_set_modem_ctrl(serial, priv->control_state);
	546	#endif
1da177e4	547	}
abf492e7	548	memcpy(cfg, &priv->cfg, sizeof(*cfg));
0c265f4e AC	549	spin_unlock_irqrestore(&priv->lock, flags);
0c265f4e AC	550
1da177e4	551	/* now commit changes to device */
abf492e7 JH	552	klsi_105_chg_port_settings(port, cfg);
	553	err:
	554	kfree(cfg);
ff8c195f	555	}
1da177e4 LT	556
1da177e4 LT	557	#if 0
0c265f4e	558	static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
1da177e4	559	{
95da310e	560	struct usb_serial_port *port = tty->driver_data;
1da177e4	561	struct usb_serial *serial = port->serial;
0c265f4e AC	562	struct mct_u232_private *priv =
0c265f4e AC	563	(struct mct_u232_private *)port->private;
1da177e4 LT	564	unsigned char lcr = priv->last_lcr;
1da177e4 LT	565
1ad7604f	566	dev_dbg(&port->dev, "%s - state=%d\n", __func__, break_state);
1da177e4	567
6b447f04	568	/* LOCKING */
1da177e4 LT	569	if (break_state)
	570	lcr \|= MCT_U232_SET_BREAK;
	571
	572	mct_u232_set_line_ctrl(serial, lcr);
ff8c195f	573	}
1da177e4 LT	574	#endif
1da177e4 LT	575
60b33c13	576	static int klsi_105_tiocmget(struct tty_struct *tty)
1da177e4	577	{
95da310e	578	struct usb_serial_port *port = tty->driver_data;
1da177e4 LT	579	struct klsi_105_private *priv = usb_get_serial_port_data(port);
	580	unsigned long flags;
	581	int rc;
	582	unsigned long line_state;
1da177e4 LT	583
	584	rc = klsi_105_get_line_state(port, &line_state);
	585	if (rc < 0) {
194343d9 GKH	586	dev_err(&port->dev,
194343d9 GKH	587	"Reading line control failed (error = %d)\n", rc);
1da177e4 LT	588	/* better return value? EAGAIN? */
	589	return rc;
	590	}
	591
0c265f4e	592	spin_lock_irqsave(&priv->lock, flags);
1da177e4	593	priv->line_state = line_state;
0c265f4e	594	spin_unlock_irqrestore(&priv->lock, flags);
1ad7604f	595	dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
1da177e4 LT	596	return (int)line_state;
	597	}
	598
68e24113	599	module_usb_serial_driver(serial_drivers, id_table);
1da177e4	600
0c265f4e AC	601	MODULE_AUTHOR(DRIVER_AUTHOR);
	602	MODULE_DESCRIPTION(DRIVER_DESC);
	603	MODULE_LICENSE("GPL");