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/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/tty.h>
  43 #include <linux/tty_driver.h>
  44 #include <linux/tty_flip.h>
  45 #include <linux/module.h>
  46 #include <linux/uaccess.h>
  47 #include <asm/unaligned.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb/serial.h>
  50 #include "kl5kusb105.h"
  51
  52 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
  53 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  54
  55
  56 /*
  57  * Function prototypes
  58  */
  59 static int klsi_105_port_probe(struct usb_serial_port *port);
  60 static int klsi_105_port_remove(struct usb_serial_port *port);
  61 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
  62 static void klsi_105_close(struct usb_serial_port *port);
  63 static void klsi_105_set_termios(struct tty_struct *tty,
  64                         struct usb_serial_port *port, struct ktermios *old);
  65 static int  klsi_105_tiocmget(struct tty_struct *tty);
  66 static int  klsi_105_tiocmset(struct tty_struct *tty,
  67                         unsigned int set, unsigned int clear);
  68 static void klsi_105_process_read_urb(struct urb *urb);
  69 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
  70                                                 void *dest, size_t size);
  71
  72 /*
  73  * All of the device info needed for the KLSI converters.
  74  */
  75 static const struct usb_device_id id_table[] = {
  76         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
  77         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
  78         { }             /* Terminating entry */
  79 };
  80
  81 MODULE_DEVICE_TABLE(usb, id_table);
  82
  83 static struct usb_serial_driver kl5kusb105d_device = {
  84         .driver = {
  85                 .owner =        THIS_MODULE,
  86                 .name =         "kl5kusb105d",
  87         },
  88         .description =          "KL5KUSB105D / PalmConnect",
  89         .id_table =             id_table,
  90         .num_ports =            1,
  91         .bulk_out_size =        64,
  92         .open =                 klsi_105_open,
  93         .close =                klsi_105_close,
  94         .set_termios =          klsi_105_set_termios,
  95         /*.break_ctl =          klsi_105_break_ctl,*/
  96         .tiocmget =             klsi_105_tiocmget,
  97         .tiocmset =             klsi_105_tiocmset,
  98         .port_probe =           klsi_105_port_probe,
  99         .port_remove =          klsi_105_port_remove,
 100         .throttle =             usb_serial_generic_throttle,
 101         .unthrottle =           usb_serial_generic_unthrottle,
 102         .process_read_urb =     klsi_105_process_read_urb,
 103         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 104 };
 105
 106 static struct usb_serial_driver * const serial_drivers[] = {
 107         &kl5kusb105d_device, NULL
 108 };
 109
 110 struct klsi_105_port_settings {
 111         __u8    pktlen;         /* always 5, it seems */
 112         __u8    baudrate;
 113         __u8    databits;
 114         __u8    unknown1;
 115         __u8    unknown2;
 116 } __attribute__ ((packed));
 117
 118 struct klsi_105_private {
 119         struct klsi_105_port_settings   cfg;
 120         struct ktermios                 termios;
 121         unsigned long                   line_state; /* modem line settings */
 122         spinlock_t                      lock;
 123 };
 124
 125
 126 /*
 127  * Handle vendor specific USB requests
 128  */
 129
 130
 131 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 132
 133 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 134                                       struct klsi_105_port_settings *settings)
 135 {
 136         int rc;
 137
 138         rc = usb_control_msg(port->serial->dev,
 139                         usb_sndctrlpipe(port->serial->dev, 0),
 140                         KL5KUSB105A_SIO_SET_DATA,
 141                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 142                         0, /* value */
 143                         0, /* index */
 144                         settings,
 145                         sizeof(struct klsi_105_port_settings),
 146                         KLSI_TIMEOUT);
 147         if (rc < 0)
 148                 dev_err(&port->dev,
 149                         "Change port settings failed (error = %d)\n", rc);
 150         dev_info(&port->serial->dev->dev,
 151                  "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
 152                  settings->pktlen, settings->baudrate, settings->databits,
 153                  settings->unknown1, settings->unknown2);
 154         return rc;
 155 }
 156
 157 /* translate a 16-bit status value from the device to linux's TIO bits */
 158 static unsigned long klsi_105_status2linestate(const __u16 status)
 159 {
 160         unsigned long res = 0;
 161
 162         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 163               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 164               ;
 165
 166         return res;
 167 }
 168
 169 /*
 170  * Read line control via vendor command and return result through
 171  * *line_state_p
 172  */
 173 /* It seems that the status buffer has always only 2 bytes length */
 174 #define KLSI_STATUSBUF_LEN      2
 175 static int klsi_105_get_line_state(struct usb_serial_port *port,
 176                                    unsigned long *line_state_p)
 177 {
 178         int rc;
 179         u8 *status_buf;
 180         __u16 status;
 181
 182         dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
 183
 184         status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
 185         if (!status_buf) {
 186                 dev_err(&port->dev, "%s - out of memory for status buffer.\n",
 187                                 __func__);
 188                 return -ENOMEM;
 189         }
 190         status_buf[0] = 0xff;
 191         status_buf[1] = 0xff;
 192         rc = usb_control_msg(port->serial->dev,
 193                              usb_rcvctrlpipe(port->serial->dev, 0),
 194                              KL5KUSB105A_SIO_POLL,
 195                              USB_TYPE_VENDOR | USB_DIR_IN,
 196                              0, /* value */
 197                              0, /* index */
 198                              status_buf, KLSI_STATUSBUF_LEN,
 199                              10000
 200                              );
 201         if (rc < 0)
 202                 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
 203                         rc);
 204         else {
 205                 status = get_unaligned_le16(status_buf);
 206
 207                 dev_info(&port->serial->dev->dev, "read status %x %x",
 208                          status_buf[0], status_buf[1]);
 209
 210                 *line_state_p = klsi_105_status2linestate(status);
 211         }
 212
 213         kfree(status_buf);
 214         return rc;
 215 }
 216
 217
 218 /*
 219  * Driver's tty interface functions
 220  */
 221
 222 static int klsi_105_port_probe(struct usb_serial_port *port)
 223 {
 224         struct klsi_105_private *priv;
 225
 226         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 227         if (!priv)
 228                 return -ENOMEM;
 229
 230         /* set initial values for control structures */
 231         priv->cfg.pktlen    = 5;
 232         priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 233         priv->cfg.databits  = kl5kusb105a_dtb_8;
 234         priv->cfg.unknown1  = 0;
 235         priv->cfg.unknown2  = 1;
 236
 237         priv->line_state    = 0;
 238
 239         spin_lock_init(&priv->lock);
 240
 241         /* priv->termios is left uninitialized until port opening */
 242
 243         usb_set_serial_port_data(port, priv);
 244
 245         return 0;
 246 }
 247
 248 static int klsi_105_port_remove(struct usb_serial_port *port)
 249 {
 250         struct klsi_105_private *priv;
 251
 252         priv = usb_get_serial_port_data(port);
 253         kfree(priv);
 254
 255         return 0;
 256 }
 257
 258 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 259 {
 260         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 261         int retval = 0;
 262         int rc;
 263         int i;
 264         unsigned long line_state;
 265         struct klsi_105_port_settings *cfg;
 266         unsigned long flags;
 267
 268         /* Do a defined restart:
 269          * Set up sane default baud rate and send the 'READ_ON'
 270          * vendor command.
 271          * FIXME: set modem line control (how?)
 272          * Then read the modem line control and store values in
 273          * priv->line_state.
 274          */
 275         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 276         if (!cfg) {
 277                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 278                                 __func__);
 279                 return -ENOMEM;
 280         }
 281         cfg->pktlen   = 5;
 282         cfg->baudrate = kl5kusb105a_sio_b9600;
 283         cfg->databits = kl5kusb105a_dtb_8;
 284         cfg->unknown1 = 0;
 285         cfg->unknown2 = 1;
 286         klsi_105_chg_port_settings(port, cfg);
 287
 288         /* set up termios structure */
 289         spin_lock_irqsave(&priv->lock, flags);
 290         priv->termios.c_iflag = tty->termios.c_iflag;
 291         priv->termios.c_oflag = tty->termios.c_oflag;
 292         priv->termios.c_cflag = tty->termios.c_cflag;
 293         priv->termios.c_lflag = tty->termios.c_lflag;
 294         for (i = 0; i < NCCS; i++)
 295                 priv->termios.c_cc[i] = tty->termios.c_cc[i];
 296         priv->cfg.pktlen   = cfg->pktlen;
 297         priv->cfg.baudrate = cfg->baudrate;
 298         priv->cfg.databits = cfg->databits;
 299         priv->cfg.unknown1 = cfg->unknown1;
 300         priv->cfg.unknown2 = cfg->unknown2;
 301         spin_unlock_irqrestore(&priv->lock, flags);
 302
 303         /* READ_ON and urb submission */
 304         rc = usb_serial_generic_open(tty, port);
 305         if (rc) {
 306                 retval = rc;
 307                 goto exit;
 308         }
 309
 310         rc = usb_control_msg(port->serial->dev,
 311                              usb_sndctrlpipe(port->serial->dev, 0),
 312                              KL5KUSB105A_SIO_CONFIGURE,
 313                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 314                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 315                              0, /* index */
 316                              NULL,
 317                              0,
 318                              KLSI_TIMEOUT);
 319         if (rc < 0) {
 320                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 321                 retval = rc;
 322         } else
 323                 dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
 324
 325         rc = klsi_105_get_line_state(port, &line_state);
 326         if (rc >= 0) {
 327                 spin_lock_irqsave(&priv->lock, flags);
 328                 priv->line_state = line_state;
 329                 spin_unlock_irqrestore(&priv->lock, flags);
 330                 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 331                 retval = 0;
 332         } else
 333                 retval = rc;
 334
 335 exit:
 336         kfree(cfg);
 337         return retval;
 338 }
 339
 340 static void klsi_105_close(struct usb_serial_port *port)
 341 {
 342         int rc;
 343
 344         /* send READ_OFF */
 345         rc = usb_control_msg(port->serial->dev,
 346                              usb_sndctrlpipe(port->serial->dev, 0),
 347                              KL5KUSB105A_SIO_CONFIGURE,
 348                              USB_TYPE_VENDOR | USB_DIR_OUT,
 349                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 350                              0, /* index */
 351                              NULL, 0,
 352                              KLSI_TIMEOUT);
 353         if (rc < 0)
 354                 dev_err(&port->dev, "failed to disable read: %d\n", rc);
 355
 356         /* shutdown our bulk reads and writes */
 357         usb_serial_generic_close(port);
 358 }
 359
 360 /* We need to write a complete 64-byte data block and encode the
 361  * number actually sent in the first double-byte, LSB-order. That
 362  * leaves at most 62 bytes of payload.
 363  */
 364 #define KLSI_HDR_LEN            2
 365 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 366                                                 void *dest, size_t size)
 367 {
 368         unsigned char *buf = dest;
 369         int count;
 370
 371         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 372                                                                 &port->lock);
 373         put_unaligned_le16(count, buf);
 374
 375         return count + KLSI_HDR_LEN;
 376 }
 377
 378 /* The data received is preceded by a length double-byte in LSB-first order.
 379  */
 380 static void klsi_105_process_read_urb(struct urb *urb)
 381 {
 382         struct usb_serial_port *port = urb->context;
 383         unsigned char *data = urb->transfer_buffer;
 384         unsigned len;
 385
 386         /* empty urbs seem to happen, we ignore them */
 387         if (!urb->actual_length)
 388                 return;
 389
 390         if (urb->actual_length <= KLSI_HDR_LEN) {
 391                 dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
 392                 return;
 393         }
 394
 395         len = get_unaligned_le16(data);
 396         if (len > urb->actual_length - KLSI_HDR_LEN) {
 397                 dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
 398                 len = urb->actual_length - KLSI_HDR_LEN;
 399         }
 400
 401         tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
 402         tty_flip_buffer_push(&port->port);
 403 }
 404
 405 static void klsi_105_set_termios(struct tty_struct *tty,
 406                                  struct usb_serial_port *port,
 407                                  struct ktermios *old_termios)
 408 {
 409         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 410         struct device *dev = &port->dev;
 411         unsigned int iflag = tty->termios.c_iflag;
 412         unsigned int old_iflag = old_termios->c_iflag;
 413         unsigned int cflag = tty->termios.c_cflag;
 414         unsigned int old_cflag = old_termios->c_cflag;
 415         struct klsi_105_port_settings *cfg;
 416         unsigned long flags;
 417         speed_t baud;
 418
 419         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 420         if (!cfg) {
 421                 dev_err(dev, "%s - out of memory for config buffer.\n", __func__);
 422                 return;
 423         }
 424
 425         /* lock while we are modifying the settings */
 426         spin_lock_irqsave(&priv->lock, flags);
 427
 428         /*
 429          * Update baud rate
 430          */
 431         baud = tty_get_baud_rate(tty);
 432
 433         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 434                 /* reassert DTR and (maybe) RTS on transition from B0 */
 435                 if ((old_cflag & CBAUD) == B0) {
 436                         dev_dbg(dev, "%s: baud was B0\n", __func__);
 437 #if 0
 438                         priv->control_state |= TIOCM_DTR;
 439                         /* don't set RTS if using hardware flow control */
 440                         if (!(old_cflag & CRTSCTS))
 441                                 priv->control_state |= TIOCM_RTS;
 442                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 443 #endif
 444                 }
 445         }
 446         switch (baud) {
 447         case 0: /* handled below */
 448                 break;
 449         case 1200:
 450                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 451                 break;
 452         case 2400:
 453                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 454                 break;
 455         case 4800:
 456                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 457                 break;
 458         case 9600:
 459                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 460                 break;
 461         case 19200:
 462                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 463                 break;
 464         case 38400:
 465                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 466                 break;
 467         case 57600:
 468                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 469                 break;
 470         case 115200:
 471                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 472                 break;
 473         default:
 474                 dev_dbg(dev, "KLSI USB->Serial converter: unsupported baudrate request, using default of 9600");
 475                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 476                 baud = 9600;
 477                 break;
 478         }
 479         if ((cflag & CBAUD) == B0) {
 480                 dev_dbg(dev, "%s: baud is B0\n", __func__);
 481                 /* Drop RTS and DTR */
 482                 /* maybe this should be simulated by sending read
 483                  * disable and read enable messages?
 484                  */
 485                 ;
 486 #if 0
 487                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 488                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 489 #endif
 490         }
 491         tty_encode_baud_rate(tty, baud, baud);
 492
 493         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 494                 /* set the number of data bits */
 495                 switch (cflag & CSIZE) {
 496                 case CS5:
 497                         dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
 498                         spin_unlock_irqrestore(&priv->lock, flags);
 499                         goto err;
 500                 case CS6:
 501                         dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
 502                         spin_unlock_irqrestore(&priv->lock, flags);
 503                         goto err;
 504                 case CS7:
 505                         priv->cfg.databits = kl5kusb105a_dtb_7;
 506                         break;
 507                 case CS8:
 508                         priv->cfg.databits = kl5kusb105a_dtb_8;
 509                         break;
 510                 default:
 511                         dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
 512                         priv->cfg.databits = kl5kusb105a_dtb_8;
 513                         break;
 514                 }
 515         }
 516
 517         /*
 518          * Update line control register (LCR)
 519          */
 520         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 521             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 522                 /* Not currently supported */
 523                 tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
 524 #if 0
 525                 priv->last_lcr = 0;
 526
 527                 /* set the parity */
 528                 if (cflag & PARENB)
 529                         priv->last_lcr |= (cflag & PARODD) ?
 530                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 531                 else
 532                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 533
 534                 /* set the number of stop bits */
 535                 priv->last_lcr |= (cflag & CSTOPB) ?
 536                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 537
 538                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 539 #endif
 540                 ;
 541         }
 542         /*
 543          * Set flow control: well, I do not really now how to handle DTR/RTS.
 544          * Just do what we have seen with SniffUSB on Win98.
 545          */
 546         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 547             || (iflag & IXON) != (old_iflag & IXON)
 548             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 549                 /* Not currently supported */
 550                 tty->termios.c_cflag &= ~CRTSCTS;
 551                 /* Drop DTR/RTS if no flow control otherwise assert */
 552 #if 0
 553                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 554                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 555                 else
 556                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 557                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 558 #endif
 559                 ;
 560         }
 561         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 562         spin_unlock_irqrestore(&priv->lock, flags);
 563
 564         /* now commit changes to device */
 565         klsi_105_chg_port_settings(port, cfg);
 566 err:
 567         kfree(cfg);
 568 }
 569
 570 #if 0
 571 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 572 {
 573         struct usb_serial_port *port = tty->driver_data;
 574         struct usb_serial *serial = port->serial;
 575         struct mct_u232_private *priv =
 576                                 (struct mct_u232_private *)port->private;
 577         unsigned char lcr = priv->last_lcr;
 578
 579         dev_dbg(&port->dev, "%s - state=%d\n", __func__, break_state);
 580
 581         /* LOCKING */
 582         if (break_state)
 583                 lcr |= MCT_U232_SET_BREAK;
 584
 585         mct_u232_set_line_ctrl(serial, lcr);
 586 }
 587 #endif
 588
 589 static int klsi_105_tiocmget(struct tty_struct *tty)
 590 {
 591         struct usb_serial_port *port = tty->driver_data;
 592         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 593         unsigned long flags;
 594         int rc;
 595         unsigned long line_state;
 596
 597         rc = klsi_105_get_line_state(port, &line_state);
 598         if (rc < 0) {
 599                 dev_err(&port->dev,
 600                         "Reading line control failed (error = %d)\n", rc);
 601                 /* better return value? EAGAIN? */
 602                 return rc;
 603         }
 604
 605         spin_lock_irqsave(&priv->lock, flags);
 606         priv->line_state = line_state;
 607         spin_unlock_irqrestore(&priv->lock, flags);
 608         dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 609         return (int)line_state;
 610 }
 611
 612 static int klsi_105_tiocmset(struct tty_struct *tty,
 613                              unsigned int set, unsigned int clear)
 614 {
 615         int retval = -EINVAL;
 616
 617 /* if this ever gets implemented, it should be done something like this:
 618         struct usb_serial *serial = port->serial;
 619         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 620         unsigned long flags;
 621         int control;
 622
 623         spin_lock_irqsave (&priv->lock, flags);
 624         if (set & TIOCM_RTS)
 625                 priv->control_state |= TIOCM_RTS;
 626         if (set & TIOCM_DTR)
 627                 priv->control_state |= TIOCM_DTR;
 628         if (clear & TIOCM_RTS)
 629                 priv->control_state &= ~TIOCM_RTS;
 630         if (clear & TIOCM_DTR)
 631                 priv->control_state &= ~TIOCM_DTR;
 632         control = priv->control_state;
 633         spin_unlock_irqrestore (&priv->lock, flags);
 634         retval = mct_u232_set_modem_ctrl(serial, control);
 635 */
 636         return retval;
 637 }
 638
 639 module_usb_serial_driver(serial_drivers, id_table);
 640
 641 MODULE_AUTHOR(DRIVER_AUTHOR);
 642 MODULE_DESCRIPTION(DRIVER_DESC);
 643 MODULE_LICENSE("GPL");