drivers/usb/serial/kl5kusb105.c

   1 /*
   2  * KLSI KL5KUSB105 chip RS232 converter driver
   3  *
   4  *   Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
   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  *
  19  * It seems that KLSI bought some silicon-design information from ScanLogic,
  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
  23  * original KLSI device and can provide some information on it, I would be
  24  * most interested in adding support for it here. If you have any information
  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
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  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>
  45 #include <linux/uaccess.h>
  46 #include <asm/unaligned.h>
  47 #include <linux/usb.h>
  48 #include <linux/usb/serial.h>
  49 #include "kl5kusb105.h"
  50
  51 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
  52 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  53
  54
  55 /*
  56  * Function prototypes
  57  */
  58 static int klsi_105_port_probe(struct usb_serial_port *port);
  59 static int klsi_105_port_remove(struct usb_serial_port *port);
  60 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
  61 static void klsi_105_close(struct usb_serial_port *port);
  62 static void klsi_105_set_termios(struct tty_struct *tty,
  63                         struct usb_serial_port *port, struct ktermios *old);
  64 static int  klsi_105_tiocmget(struct tty_struct *tty);
  65 static int  klsi_105_tiocmset(struct tty_struct *tty,
  66                         unsigned int set, unsigned int clear);
  67 static void klsi_105_process_read_urb(struct urb *urb);
  68 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
  69                                                 void *dest, size_t size);
  70
  71 /*
  72  * All of the device info needed for the KLSI converters.
  73  */
  74 static const struct usb_device_id id_table[] = {
  75         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
  76         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
  77         { }             /* Terminating entry */
  78 };
  79
  80 MODULE_DEVICE_TABLE(usb, id_table);
  81
  82 static struct usb_serial_driver kl5kusb105d_device = {
  83         .driver = {
  84                 .owner =        THIS_MODULE,
  85                 .name =         "kl5kusb105d",
  86         },
  87         .description =          "KL5KUSB105D / PalmConnect",
  88         .id_table =             id_table,
  89         .num_ports =            1,
  90         .bulk_out_size =        64,
  91         .open =                 klsi_105_open,
  92         .close =                klsi_105_close,
  93         .set_termios =          klsi_105_set_termios,
  94         /*.break_ctl =          klsi_105_break_ctl,*/
  95         .tiocmget =             klsi_105_tiocmget,
  96         .tiocmset =             klsi_105_tiocmset,
  97         .port_probe =           klsi_105_port_probe,
  98         .port_remove =          klsi_105_port_remove,
  99         .throttle =             usb_serial_generic_throttle,
 100         .unthrottle =           usb_serial_generic_unthrottle,
 101         .process_read_urb =     klsi_105_process_read_urb,
 102         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 103 };
 104
 105 static struct usb_serial_driver * const serial_drivers[] = {
 106         &kl5kusb105d_device, NULL
 107 };
 108
 109 struct klsi_105_port_settings {
 110         __u8    pktlen;         /* always 5, it seems */
 111         __u8    baudrate;
 112         __u8    databits;
 113         __u8    unknown1;
 114         __u8    unknown2;
 115 } __attribute__ ((packed));
 116
 117 struct klsi_105_private {
 118         struct klsi_105_port_settings   cfg;
 119         struct ktermios                 termios;
 120         unsigned long                   line_state; /* modem line settings */
 121         spinlock_t                      lock;
 122 };
 123
 124
 125 /*
 126  * Handle vendor specific USB requests
 127  */
 128
 129
 130 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 131
 132 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 133                                       struct klsi_105_port_settings *settings)
 134 {
 135         int rc;
 136
 137         rc = usb_control_msg(port->serial->dev,
 138                         usb_sndctrlpipe(port->serial->dev, 0),
 139                         KL5KUSB105A_SIO_SET_DATA,
 140                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 141                         0, /* value */
 142                         0, /* index */
 143                         settings,
 144                         sizeof(struct klsi_105_port_settings),
 145                         KLSI_TIMEOUT);
 146         if (rc < 0)
 147                 dev_err(&port->dev,
 148                         "Change port settings failed (error = %d)\n", rc);
 149         dev_info(&port->serial->dev->dev,
 150                  "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
 151                  settings->pktlen, settings->baudrate, settings->databits,
 152                  settings->unknown1, settings->unknown2);
 153         return rc;
 154 }
 155
 156 /* translate a 16-bit status value from the device to linux's TIO bits */
 157 static unsigned long klsi_105_status2linestate(const __u16 status)
 158 {
 159         unsigned long res = 0;
 160
 161         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 162               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 163               ;
 164
 165         return res;
 166 }
 167
 168 /*
 169  * Read line control via vendor command and return result through
 170  * *line_state_p
 171  */
 172 /* It seems that the status buffer has always only 2 bytes length */
 173 #define KLSI_STATUSBUF_LEN      2
 174 static int klsi_105_get_line_state(struct usb_serial_port *port,
 175                                    unsigned long *line_state_p)
 176 {
 177         int rc;
 178         u8 *status_buf;
 179         __u16 status;
 180
 181         dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
 182
 183         status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
 184         if (!status_buf)
 185                 return -ENOMEM;
 186
 187         status_buf[0] = 0xff;
 188         status_buf[1] = 0xff;
 189         rc = usb_control_msg(port->serial->dev,
 190                              usb_rcvctrlpipe(port->serial->dev, 0),
 191                              KL5KUSB105A_SIO_POLL,
 192                              USB_TYPE_VENDOR | USB_DIR_IN,
 193                              0, /* value */
 194                              0, /* index */
 195                              status_buf, KLSI_STATUSBUF_LEN,
 196                              10000
 197                              );
 198         if (rc < 0)
 199                 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
 200                         rc);
 201         else {
 202                 status = get_unaligned_le16(status_buf);
 203
 204                 dev_info(&port->serial->dev->dev, "read status %x %x",
 205                          status_buf[0], status_buf[1]);
 206
 207                 *line_state_p = klsi_105_status2linestate(status);
 208         }
 209
 210         kfree(status_buf);
 211         return rc;
 212 }
 213
 214
 215 /*
 216  * Driver's tty interface functions
 217  */
 218
 219 static int klsi_105_port_probe(struct usb_serial_port *port)
 220 {
 221         struct klsi_105_private *priv;
 222
 223         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 224         if (!priv)
 225                 return -ENOMEM;
 226
 227         /* set initial values for control structures */
 228         priv->cfg.pktlen    = 5;
 229         priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 230         priv->cfg.databits  = kl5kusb105a_dtb_8;
 231         priv->cfg.unknown1  = 0;
 232         priv->cfg.unknown2  = 1;
 233
 234         priv->line_state    = 0;
 235
 236         spin_lock_init(&priv->lock);
 237
 238         /* priv->termios is left uninitialized until port opening */
 239
 240         usb_set_serial_port_data(port, priv);
 241
 242         return 0;
 243 }
 244
 245 static int klsi_105_port_remove(struct usb_serial_port *port)
 246 {
 247         struct klsi_105_private *priv;
 248
 249         priv = usb_get_serial_port_data(port);
 250         kfree(priv);
 251
 252         return 0;
 253 }
 254
 255 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 256 {
 257         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 258         int retval = 0;
 259         int rc;
 260         int i;
 261         unsigned long line_state;
 262         struct klsi_105_port_settings *cfg;
 263         unsigned long flags;
 264
 265         /* Do a defined restart:
 266          * Set up sane default baud rate and send the 'READ_ON'
 267          * vendor command.
 268          * FIXME: set modem line control (how?)
 269          * Then read the modem line control and store values in
 270          * priv->line_state.
 271          */
 272         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 273         if (!cfg)
 274                 return -ENOMEM;
 275
 276         cfg->pktlen   = 5;
 277         cfg->baudrate = kl5kusb105a_sio_b9600;
 278         cfg->databits = kl5kusb105a_dtb_8;
 279         cfg->unknown1 = 0;
 280         cfg->unknown2 = 1;
 281         klsi_105_chg_port_settings(port, cfg);
 282
 283         /* set up termios structure */
 284         spin_lock_irqsave(&priv->lock, flags);
 285         priv->termios.c_iflag = tty->termios.c_iflag;
 286         priv->termios.c_oflag = tty->termios.c_oflag;
 287         priv->termios.c_cflag = tty->termios.c_cflag;
 288         priv->termios.c_lflag = tty->termios.c_lflag;
 289         for (i = 0; i < NCCS; i++)
 290                 priv->termios.c_cc[i] = tty->termios.c_cc[i];
 291         priv->cfg.pktlen   = cfg->pktlen;
 292         priv->cfg.baudrate = cfg->baudrate;
 293         priv->cfg.databits = cfg->databits;
 294         priv->cfg.unknown1 = cfg->unknown1;
 295         priv->cfg.unknown2 = cfg->unknown2;
 296         spin_unlock_irqrestore(&priv->lock, flags);
 297
 298         /* READ_ON and urb submission */
 299         rc = usb_serial_generic_open(tty, port);
 300         if (rc) {
 301                 retval = rc;
 302                 goto exit;
 303         }
 304
 305         rc = usb_control_msg(port->serial->dev,
 306                              usb_sndctrlpipe(port->serial->dev, 0),
 307                              KL5KUSB105A_SIO_CONFIGURE,
 308                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 309                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 310                              0, /* index */
 311                              NULL,
 312                              0,
 313                              KLSI_TIMEOUT);
 314         if (rc < 0) {
 315                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 316                 retval = rc;
 317         } else
 318                 dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
 319
 320         rc = klsi_105_get_line_state(port, &line_state);
 321         if (rc >= 0) {
 322                 spin_lock_irqsave(&priv->lock, flags);
 323                 priv->line_state = line_state;
 324                 spin_unlock_irqrestore(&priv->lock, flags);
 325                 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 326                 retval = 0;
 327         } else
 328                 retval = rc;
 329
 330 exit:
 331         kfree(cfg);
 332         return retval;
 333 }
 334
 335 static void klsi_105_close(struct usb_serial_port *port)
 336 {
 337         int rc;
 338
 339         /* send READ_OFF */
 340         rc = usb_control_msg(port->serial->dev,
 341                              usb_sndctrlpipe(port->serial->dev, 0),
 342                              KL5KUSB105A_SIO_CONFIGURE,
 343                              USB_TYPE_VENDOR | USB_DIR_OUT,
 344                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 345                              0, /* index */
 346                              NULL, 0,
 347                              KLSI_TIMEOUT);
 348         if (rc < 0)
 349                 dev_err(&port->dev, "failed to disable read: %d\n", rc);
 350
 351         /* shutdown our bulk reads and writes */
 352         usb_serial_generic_close(port);
 353 }
 354
 355 /* We need to write a complete 64-byte data block and encode the
 356  * number actually sent in the first double-byte, LSB-order. That
 357  * leaves at most 62 bytes of payload.
 358  */
 359 #define KLSI_HDR_LEN            2
 360 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 361                                                 void *dest, size_t size)
 362 {
 363         unsigned char *buf = dest;
 364         int count;
 365
 366         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 367                                                                 &port->lock);
 368         put_unaligned_le16(count, buf);
 369
 370         return count + KLSI_HDR_LEN;
 371 }
 372
 373 /* The data received is preceded by a length double-byte in LSB-first order.
 374  */
 375 static void klsi_105_process_read_urb(struct urb *urb)
 376 {
 377         struct usb_serial_port *port = urb->context;
 378         unsigned char *data = urb->transfer_buffer;
 379         unsigned len;
 380
 381         /* empty urbs seem to happen, we ignore them */
 382         if (!urb->actual_length)
 383                 return;
 384
 385         if (urb->actual_length <= KLSI_HDR_LEN) {
 386                 dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
 387                 return;
 388         }
 389
 390         len = get_unaligned_le16(data);
 391         if (len > urb->actual_length - KLSI_HDR_LEN) {
 392                 dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
 393                 len = urb->actual_length - KLSI_HDR_LEN;
 394         }
 395
 396         tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
 397         tty_flip_buffer_push(&port->port);
 398 }
 399
 400 static void klsi_105_set_termios(struct tty_struct *tty,
 401                                  struct usb_serial_port *port,
 402                                  struct ktermios *old_termios)
 403 {
 404         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 405         struct device *dev = &port->dev;
 406         unsigned int iflag = tty->termios.c_iflag;
 407         unsigned int old_iflag = old_termios->c_iflag;
 408         unsigned int cflag = tty->termios.c_cflag;
 409         unsigned int old_cflag = old_termios->c_cflag;
 410         struct klsi_105_port_settings *cfg;
 411         unsigned long flags;
 412         speed_t baud;
 413
 414         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 415         if (!cfg)
 416                 return;
 417
 418         /* lock while we are modifying the settings */
 419         spin_lock_irqsave(&priv->lock, flags);
 420
 421         /*
 422          * Update baud rate
 423          */
 424         baud = tty_get_baud_rate(tty);
 425
 426         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 427                 /* reassert DTR and (maybe) RTS on transition from B0 */
 428                 if ((old_cflag & CBAUD) == B0) {
 429                         dev_dbg(dev, "%s: baud was B0\n", __func__);
 430 #if 0
 431                         priv->control_state |= TIOCM_DTR;
 432                         /* don't set RTS if using hardware flow control */
 433                         if (!(old_cflag & CRTSCTS))
 434                                 priv->control_state |= TIOCM_RTS;
 435                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 436 #endif
 437                 }
 438         }
 439         switch (baud) {
 440         case 0: /* handled below */
 441                 break;
 442         case 1200:
 443                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 444                 break;
 445         case 2400:
 446                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 447                 break;
 448         case 4800:
 449                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 450                 break;
 451         case 9600:
 452                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 453                 break;
 454         case 19200:
 455                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 456                 break;
 457         case 38400:
 458                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 459                 break;
 460         case 57600:
 461                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 462                 break;
 463         case 115200:
 464                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 465                 break;
 466         default:
 467                 dev_dbg(dev, "KLSI USB->Serial converter: unsupported baudrate request, using default of 9600");
 468                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 469                 baud = 9600;
 470                 break;
 471         }
 472         if ((cflag & CBAUD) == B0) {
 473                 dev_dbg(dev, "%s: baud is B0\n", __func__);
 474                 /* Drop RTS and DTR */
 475                 /* maybe this should be simulated by sending read
 476                  * disable and read enable messages?
 477                  */
 478                 ;
 479 #if 0
 480                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 481                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 482 #endif
 483         }
 484         tty_encode_baud_rate(tty, baud, baud);
 485
 486         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 487                 /* set the number of data bits */
 488                 switch (cflag & CSIZE) {
 489                 case CS5:
 490                         dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
 491                         spin_unlock_irqrestore(&priv->lock, flags);
 492                         goto err;
 493                 case CS6:
 494                         dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
 495                         spin_unlock_irqrestore(&priv->lock, flags);
 496                         goto err;
 497                 case CS7:
 498                         priv->cfg.databits = kl5kusb105a_dtb_7;
 499                         break;
 500                 case CS8:
 501                         priv->cfg.databits = kl5kusb105a_dtb_8;
 502                         break;
 503                 default:
 504                         dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
 505                         priv->cfg.databits = kl5kusb105a_dtb_8;
 506                         break;
 507                 }
 508         }
 509
 510         /*
 511          * Update line control register (LCR)
 512          */
 513         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 514             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 515                 /* Not currently supported */
 516                 tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
 517 #if 0
 518                 priv->last_lcr = 0;
 519
 520                 /* set the parity */
 521                 if (cflag & PARENB)
 522                         priv->last_lcr |= (cflag & PARODD) ?
 523                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 524                 else
 525                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 526
 527                 /* set the number of stop bits */
 528                 priv->last_lcr |= (cflag & CSTOPB) ?
 529                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 530
 531                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 532 #endif
 533                 ;
 534         }
 535         /*
 536          * Set flow control: well, I do not really now how to handle DTR/RTS.
 537          * Just do what we have seen with SniffUSB on Win98.
 538          */
 539         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 540             || (iflag & IXON) != (old_iflag & IXON)
 541             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 542                 /* Not currently supported */
 543                 tty->termios.c_cflag &= ~CRTSCTS;
 544                 /* Drop DTR/RTS if no flow control otherwise assert */
 545 #if 0
 546                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 547                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 548                 else
 549                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 550                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 551 #endif
 552                 ;
 553         }
 554         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 555         spin_unlock_irqrestore(&priv->lock, flags);
 556
 557         /* now commit changes to device */
 558         klsi_105_chg_port_settings(port, cfg);
 559 err:
 560         kfree(cfg);
 561 }
 562
 563 #if 0
 564 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 565 {
 566         struct usb_serial_port *port = tty->driver_data;
 567         struct usb_serial *serial = port->serial;
 568         struct mct_u232_private *priv =
 569                                 (struct mct_u232_private *)port->private;
 570         unsigned char lcr = priv->last_lcr;
 571
 572         dev_dbg(&port->dev, "%s - state=%d\n", __func__, break_state);
 573
 574         /* LOCKING */
 575         if (break_state)
 576                 lcr |= MCT_U232_SET_BREAK;
 577
 578         mct_u232_set_line_ctrl(serial, lcr);
 579 }
 580 #endif
 581
 582 static int klsi_105_tiocmget(struct tty_struct *tty)
 583 {
 584         struct usb_serial_port *port = tty->driver_data;
 585         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 586         unsigned long flags;
 587         int rc;
 588         unsigned long line_state;
 589
 590         rc = klsi_105_get_line_state(port, &line_state);
 591         if (rc < 0) {
 592                 dev_err(&port->dev,
 593                         "Reading line control failed (error = %d)\n", rc);
 594                 /* better return value? EAGAIN? */
 595                 return rc;
 596         }
 597
 598         spin_lock_irqsave(&priv->lock, flags);
 599         priv->line_state = line_state;
 600         spin_unlock_irqrestore(&priv->lock, flags);
 601         dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 602         return (int)line_state;
 603 }
 604
 605 static int klsi_105_tiocmset(struct tty_struct *tty,
 606                              unsigned int set, unsigned int clear)
 607 {
 608         int retval = -EINVAL;
 609
 610 /* if this ever gets implemented, it should be done something like this:
 611         struct usb_serial *serial = port->serial;
 612         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 613         unsigned long flags;
 614         int control;
 615
 616         spin_lock_irqsave (&priv->lock, flags);
 617         if (set & TIOCM_RTS)
 618                 priv->control_state |= TIOCM_RTS;
 619         if (set & TIOCM_DTR)
 620                 priv->control_state |= TIOCM_DTR;
 621         if (clear & TIOCM_RTS)
 622                 priv->control_state &= ~TIOCM_RTS;
 623         if (clear & TIOCM_DTR)
 624                 priv->control_state &= ~TIOCM_DTR;
 625         control = priv->control_state;
 626         spin_unlock_irqrestore (&priv->lock, flags);
 627         retval = mct_u232_set_modem_ctrl(serial, control);
 628 */
 629         return retval;
 630 }
 631
 632 module_usb_serial_driver(serial_drivers, id_table);
 633
 634 MODULE_AUTHOR(DRIVER_AUTHOR);
 635 MODULE_DESCRIPTION(DRIVER_DESC);
 636 MODULE_LICENSE("GPL");