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 static bool debug;
  53
  54 /*
  55  * Version Information
  56  */
  57 #define DRIVER_VERSION "v0.4"
  58 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
  59 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  60
  61
  62 /*
  63  * Function prototypes
  64  */
  65 static int  klsi_105_startup(struct usb_serial *serial);
  66 static void klsi_105_release(struct usb_serial *serial);
  67 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
  68 static void klsi_105_close(struct usb_serial_port *port);
  69 static void klsi_105_set_termios(struct tty_struct *tty,
  70                         struct usb_serial_port *port, struct ktermios *old);
  71 static int  klsi_105_tiocmget(struct tty_struct *tty);
  72 static int  klsi_105_tiocmset(struct tty_struct *tty,
  73                         unsigned int set, unsigned int clear);
  74 static void klsi_105_process_read_urb(struct urb *urb);
  75 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
  76                                                 void *dest, size_t size);
  77
  78 /*
  79  * All of the device info needed for the KLSI converters.
  80  */
  81 static const struct usb_device_id id_table[] = {
  82         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
  83         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
  84         { }             /* Terminating entry */
  85 };
  86
  87 MODULE_DEVICE_TABLE(usb, id_table);
  88
  89 static struct usb_driver kl5kusb105d_driver = {
  90         .name =         "kl5kusb105d",
  91         .id_table =     id_table,
  92 };
  93
  94 static struct usb_serial_driver kl5kusb105d_device = {
  95         .driver = {
  96                 .owner =        THIS_MODULE,
  97                 .name =         "kl5kusb105d",
  98         },
  99         .description =          "KL5KUSB105D / PalmConnect",
 100         .id_table =             id_table,
 101         .num_ports =            1,
 102         .bulk_out_size =        64,
 103         .open =                 klsi_105_open,
 104         .close =                klsi_105_close,
 105         .set_termios =          klsi_105_set_termios,
 106         /*.break_ctl =          klsi_105_break_ctl,*/
 107         .tiocmget =             klsi_105_tiocmget,
 108         .tiocmset =             klsi_105_tiocmset,
 109         .attach =               klsi_105_startup,
 110         .release =              klsi_105_release,
 111         .throttle =             usb_serial_generic_throttle,
 112         .unthrottle =           usb_serial_generic_unthrottle,
 113         .process_read_urb =     klsi_105_process_read_urb,
 114         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 115 };
 116
 117 static struct usb_serial_driver * const serial_drivers[] = {
 118         &kl5kusb105d_device, NULL
 119 };
 120
 121 struct klsi_105_port_settings {
 122         __u8    pktlen;         /* always 5, it seems */
 123         __u8    baudrate;
 124         __u8    databits;
 125         __u8    unknown1;
 126         __u8    unknown2;
 127 } __attribute__ ((packed));
 128
 129 struct klsi_105_private {
 130         struct klsi_105_port_settings   cfg;
 131         struct ktermios                 termios;
 132         unsigned long                   line_state; /* modem line settings */
 133         spinlock_t                      lock;
 134 };
 135
 136
 137 /*
 138  * Handle vendor specific USB requests
 139  */
 140
 141
 142 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 143
 144 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 145                                       struct klsi_105_port_settings *settings)
 146 {
 147         int rc;
 148
 149         rc = usb_control_msg(port->serial->dev,
 150                         usb_sndctrlpipe(port->serial->dev, 0),
 151                         KL5KUSB105A_SIO_SET_DATA,
 152                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 153                         0, /* value */
 154                         0, /* index */
 155                         settings,
 156                         sizeof(struct klsi_105_port_settings),
 157                         KLSI_TIMEOUT);
 158         if (rc < 0)
 159                 dev_err(&port->dev,
 160                         "Change port settings failed (error = %d)\n", rc);
 161         dev_info(&port->serial->dev->dev,
 162                  "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
 163                  settings->pktlen, settings->baudrate, settings->databits,
 164                  settings->unknown1, settings->unknown2);
 165         return rc;
 166 }
 167
 168 /* translate a 16-bit status value from the device to linux's TIO bits */
 169 static unsigned long klsi_105_status2linestate(const __u16 status)
 170 {
 171         unsigned long res = 0;
 172
 173         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 174               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 175               ;
 176
 177         return res;
 178 }
 179
 180 /*
 181  * Read line control via vendor command and return result through
 182  * *line_state_p
 183  */
 184 /* It seems that the status buffer has always only 2 bytes length */
 185 #define KLSI_STATUSBUF_LEN      2
 186 static int klsi_105_get_line_state(struct usb_serial_port *port,
 187                                    unsigned long *line_state_p)
 188 {
 189         int rc;
 190         u8 *status_buf;
 191         __u16 status;
 192
 193         dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
 194
 195         status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
 196         if (!status_buf) {
 197                 dev_err(&port->dev, "%s - out of memory for status buffer.\n",
 198                                 __func__);
 199                 return -ENOMEM;
 200         }
 201         status_buf[0] = 0xff;
 202         status_buf[1] = 0xff;
 203         rc = usb_control_msg(port->serial->dev,
 204                              usb_rcvctrlpipe(port->serial->dev, 0),
 205                              KL5KUSB105A_SIO_POLL,
 206                              USB_TYPE_VENDOR | USB_DIR_IN,
 207                              0, /* value */
 208                              0, /* index */
 209                              status_buf, KLSI_STATUSBUF_LEN,
 210                              10000
 211                              );
 212         if (rc < 0)
 213                 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
 214                         rc);
 215         else {
 216                 status = get_unaligned_le16(status_buf);
 217
 218                 dev_info(&port->serial->dev->dev, "read status %x %x",
 219                          status_buf[0], status_buf[1]);
 220
 221                 *line_state_p = klsi_105_status2linestate(status);
 222         }
 223
 224         kfree(status_buf);
 225         return rc;
 226 }
 227
 228
 229 /*
 230  * Driver's tty interface functions
 231  */
 232
 233 static int klsi_105_startup(struct usb_serial *serial)
 234 {
 235         struct klsi_105_private *priv;
 236         int i;
 237
 238         /* check if we support the product id (see keyspan.c)
 239          * FIXME
 240          */
 241
 242         /* allocate the private data structure */
 243         for (i = 0; i < serial->num_ports; i++) {
 244                 priv = kmalloc(sizeof(struct klsi_105_private),
 245                                                    GFP_KERNEL);
 246                 if (!priv) {
 247                         dbg("%skmalloc for klsi_105_private failed.", __func__);
 248                         i--;
 249                         goto err_cleanup;
 250                 }
 251                 /* set initial values for control structures */
 252                 priv->cfg.pktlen    = 5;
 253                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 254                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 255                 priv->cfg.unknown1  = 0;
 256                 priv->cfg.unknown2  = 1;
 257
 258                 priv->line_state    = 0;
 259
 260                 usb_set_serial_port_data(serial->port[i], priv);
 261
 262                 spin_lock_init(&priv->lock);
 263
 264                 /* priv->termios is left uninitialized until port opening */
 265                 init_waitqueue_head(&serial->port[i]->write_wait);
 266         }
 267
 268         return 0;
 269
 270 err_cleanup:
 271         for (; i >= 0; i--) {
 272                 priv = usb_get_serial_port_data(serial->port[i]);
 273                 kfree(priv);
 274                 usb_set_serial_port_data(serial->port[i], NULL);
 275         }
 276         return -ENOMEM;
 277 }
 278
 279 static void klsi_105_release(struct usb_serial *serial)
 280 {
 281         int i;
 282
 283         for (i = 0; i < serial->num_ports; ++i)
 284                 kfree(usb_get_serial_port_data(serial->port[i]));
 285 }
 286
 287 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 288 {
 289         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 290         int retval = 0;
 291         int rc;
 292         int i;
 293         unsigned long line_state;
 294         struct klsi_105_port_settings *cfg;
 295         unsigned long flags;
 296
 297         /* Do a defined restart:
 298          * Set up sane default baud rate and send the 'READ_ON'
 299          * vendor command.
 300          * FIXME: set modem line control (how?)
 301          * Then read the modem line control and store values in
 302          * priv->line_state.
 303          */
 304         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 305         if (!cfg) {
 306                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 307                                 __func__);
 308                 return -ENOMEM;
 309         }
 310         cfg->pktlen   = 5;
 311         cfg->baudrate = kl5kusb105a_sio_b9600;
 312         cfg->databits = kl5kusb105a_dtb_8;
 313         cfg->unknown1 = 0;
 314         cfg->unknown2 = 1;
 315         klsi_105_chg_port_settings(port, cfg);
 316
 317         /* set up termios structure */
 318         spin_lock_irqsave(&priv->lock, flags);
 319         priv->termios.c_iflag = tty->termios->c_iflag;
 320         priv->termios.c_oflag = tty->termios->c_oflag;
 321         priv->termios.c_cflag = tty->termios->c_cflag;
 322         priv->termios.c_lflag = tty->termios->c_lflag;
 323         for (i = 0; i < NCCS; i++)
 324                 priv->termios.c_cc[i] = tty->termios->c_cc[i];
 325         priv->cfg.pktlen   = cfg->pktlen;
 326         priv->cfg.baudrate = cfg->baudrate;
 327         priv->cfg.databits = cfg->databits;
 328         priv->cfg.unknown1 = cfg->unknown1;
 329         priv->cfg.unknown2 = cfg->unknown2;
 330         spin_unlock_irqrestore(&priv->lock, flags);
 331
 332         /* READ_ON and urb submission */
 333         rc = usb_serial_generic_open(tty, port);
 334         if (rc) {
 335                 retval = rc;
 336                 goto exit;
 337         }
 338
 339         rc = usb_control_msg(port->serial->dev,
 340                              usb_sndctrlpipe(port->serial->dev, 0),
 341                              KL5KUSB105A_SIO_CONFIGURE,
 342                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 343                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 344                              0, /* index */
 345                              NULL,
 346                              0,
 347                              KLSI_TIMEOUT);
 348         if (rc < 0) {
 349                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 350                 retval = rc;
 351         } else
 352                 dbg("%s - enabled reading", __func__);
 353
 354         rc = klsi_105_get_line_state(port, &line_state);
 355         if (rc >= 0) {
 356                 spin_lock_irqsave(&priv->lock, flags);
 357                 priv->line_state = line_state;
 358                 spin_unlock_irqrestore(&priv->lock, flags);
 359                 dbg("%s - read line state 0x%lx", __func__, line_state);
 360                 retval = 0;
 361         } else
 362                 retval = rc;
 363
 364 exit:
 365         kfree(cfg);
 366         return retval;
 367 }
 368
 369 static void klsi_105_close(struct usb_serial_port *port)
 370 {
 371         int rc;
 372
 373         mutex_lock(&port->serial->disc_mutex);
 374         if (!port->serial->disconnected) {
 375                 /* send READ_OFF */
 376                 rc = usb_control_msg(port->serial->dev,
 377                                      usb_sndctrlpipe(port->serial->dev, 0),
 378                                      KL5KUSB105A_SIO_CONFIGURE,
 379                                      USB_TYPE_VENDOR | USB_DIR_OUT,
 380                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 381                                      0, /* index */
 382                                      NULL, 0,
 383                                      KLSI_TIMEOUT);
 384                 if (rc < 0)
 385                         dev_err(&port->dev,
 386                                 "Disabling read failed (error = %d)\n", rc);
 387         }
 388         mutex_unlock(&port->serial->disc_mutex);
 389
 390         /* shutdown our bulk reads and writes */
 391         usb_serial_generic_close(port);
 392
 393         /* wgg - do I need this? I think so. */
 394         usb_kill_urb(port->interrupt_in_urb);
 395 }
 396
 397 /* We need to write a complete 64-byte data block and encode the
 398  * number actually sent in the first double-byte, LSB-order. That
 399  * leaves at most 62 bytes of payload.
 400  */
 401 #define KLSI_HDR_LEN            2
 402 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 403                                                 void *dest, size_t size)
 404 {
 405         unsigned char *buf = dest;
 406         int count;
 407
 408         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 409                                                                 &port->lock);
 410         put_unaligned_le16(count, buf);
 411
 412         return count + KLSI_HDR_LEN;
 413 }
 414
 415 /* The data received is preceded by a length double-byte in LSB-first order.
 416  */
 417 static void klsi_105_process_read_urb(struct urb *urb)
 418 {
 419         struct usb_serial_port *port = urb->context;
 420         unsigned char *data = urb->transfer_buffer;
 421         struct tty_struct *tty;
 422         unsigned len;
 423
 424         /* empty urbs seem to happen, we ignore them */
 425         if (!urb->actual_length)
 426                 return;
 427
 428         if (urb->actual_length <= KLSI_HDR_LEN) {
 429                 dbg("%s - malformed packet", __func__);
 430                 return;
 431         }
 432
 433         tty = tty_port_tty_get(&port->port);
 434         if (!tty)
 435                 return;
 436
 437         len = get_unaligned_le16(data);
 438         if (len > urb->actual_length - KLSI_HDR_LEN) {
 439                 dbg("%s - packet length mismatch", __func__);
 440                 len = urb->actual_length - KLSI_HDR_LEN;
 441         }
 442
 443         tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
 444         tty_flip_buffer_push(tty);
 445         tty_kref_put(tty);
 446 }
 447
 448 static void klsi_105_set_termios(struct tty_struct *tty,
 449                                  struct usb_serial_port *port,
 450                                  struct ktermios *old_termios)
 451 {
 452         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 453         unsigned int iflag = tty->termios->c_iflag;
 454         unsigned int old_iflag = old_termios->c_iflag;
 455         unsigned int cflag = tty->termios->c_cflag;
 456         unsigned int old_cflag = old_termios->c_cflag;
 457         struct klsi_105_port_settings *cfg;
 458         unsigned long flags;
 459         speed_t baud;
 460
 461         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 462         if (!cfg) {
 463                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 464                                 __func__);
 465                 return;
 466         }
 467
 468         /* lock while we are modifying the settings */
 469         spin_lock_irqsave(&priv->lock, flags);
 470
 471         /*
 472          * Update baud rate
 473          */
 474         baud = tty_get_baud_rate(tty);
 475
 476         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 477                 /* reassert DTR and (maybe) RTS on transition from B0 */
 478                 if ((old_cflag & CBAUD) == B0) {
 479                         dbg("%s: baud was B0", __func__);
 480 #if 0
 481                         priv->control_state |= TIOCM_DTR;
 482                         /* don't set RTS if using hardware flow control */
 483                         if (!(old_cflag & CRTSCTS))
 484                                 priv->control_state |= TIOCM_RTS;
 485                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 486 #endif
 487                 }
 488         }
 489         switch (baud) {
 490         case 0: /* handled below */
 491                 break;
 492         case 1200:
 493                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 494                 break;
 495         case 2400:
 496                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 497                 break;
 498         case 4800:
 499                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 500                 break;
 501         case 9600:
 502                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 503                 break;
 504         case 19200:
 505                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 506                 break;
 507         case 38400:
 508                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 509                 break;
 510         case 57600:
 511                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 512                 break;
 513         case 115200:
 514                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 515                 break;
 516         default:
 517                 dbg("KLSI USB->Serial converter:"
 518                     " unsupported baudrate request, using default of 9600");
 519                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 520                 baud = 9600;
 521                 break;
 522         }
 523         if ((cflag & CBAUD) == B0) {
 524                 dbg("%s: baud is B0", __func__);
 525                 /* Drop RTS and DTR */
 526                 /* maybe this should be simulated by sending read
 527                  * disable and read enable messages?
 528                  */
 529                 ;
 530 #if 0
 531                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 532                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 533 #endif
 534         }
 535         tty_encode_baud_rate(tty, baud, baud);
 536
 537         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 538                 /* set the number of data bits */
 539                 switch (cflag & CSIZE) {
 540                 case CS5:
 541                         dbg("%s - 5 bits/byte not supported", __func__);
 542                         spin_unlock_irqrestore(&priv->lock, flags);
 543                         goto err;
 544                 case CS6:
 545                         dbg("%s - 6 bits/byte not supported", __func__);
 546                         spin_unlock_irqrestore(&priv->lock, flags);
 547                         goto err;
 548                 case CS7:
 549                         priv->cfg.databits = kl5kusb105a_dtb_7;
 550                         break;
 551                 case CS8:
 552                         priv->cfg.databits = kl5kusb105a_dtb_8;
 553                         break;
 554                 default:
 555                         dev_err(&port->dev,
 556                                 "CSIZE was not CS5-CS8, using default of 8\n");
 557                         priv->cfg.databits = kl5kusb105a_dtb_8;
 558                         break;
 559                 }
 560         }
 561
 562         /*
 563          * Update line control register (LCR)
 564          */
 565         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 566             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 567                 /* Not currently supported */
 568                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 569 #if 0
 570                 priv->last_lcr = 0;
 571
 572                 /* set the parity */
 573                 if (cflag & PARENB)
 574                         priv->last_lcr |= (cflag & PARODD) ?
 575                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 576                 else
 577                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 578
 579                 /* set the number of stop bits */
 580                 priv->last_lcr |= (cflag & CSTOPB) ?
 581                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 582
 583                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 584 #endif
 585                 ;
 586         }
 587         /*
 588          * Set flow control: well, I do not really now how to handle DTR/RTS.
 589          * Just do what we have seen with SniffUSB on Win98.
 590          */
 591         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 592             || (iflag & IXON) != (old_iflag & IXON)
 593             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 594                 /* Not currently supported */
 595                 tty->termios->c_cflag &= ~CRTSCTS;
 596                 /* Drop DTR/RTS if no flow control otherwise assert */
 597 #if 0
 598                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 599                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 600                 else
 601                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 602                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 603 #endif
 604                 ;
 605         }
 606         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 607         spin_unlock_irqrestore(&priv->lock, flags);
 608
 609         /* now commit changes to device */
 610         klsi_105_chg_port_settings(port, cfg);
 611 err:
 612         kfree(cfg);
 613 }
 614
 615 #if 0
 616 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 617 {
 618         struct usb_serial_port *port = tty->driver_data;
 619         struct usb_serial *serial = port->serial;
 620         struct mct_u232_private *priv =
 621                                 (struct mct_u232_private *)port->private;
 622         unsigned char lcr = priv->last_lcr;
 623
 624         dbg("%sstate=%d", __func__, break_state);
 625
 626         /* LOCKING */
 627         if (break_state)
 628                 lcr |= MCT_U232_SET_BREAK;
 629
 630         mct_u232_set_line_ctrl(serial, lcr);
 631 }
 632 #endif
 633
 634 static int klsi_105_tiocmget(struct tty_struct *tty)
 635 {
 636         struct usb_serial_port *port = tty->driver_data;
 637         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 638         unsigned long flags;
 639         int rc;
 640         unsigned long line_state;
 641
 642         rc = klsi_105_get_line_state(port, &line_state);
 643         if (rc < 0) {
 644                 dev_err(&port->dev,
 645                         "Reading line control failed (error = %d)\n", rc);
 646                 /* better return value? EAGAIN? */
 647                 return rc;
 648         }
 649
 650         spin_lock_irqsave(&priv->lock, flags);
 651         priv->line_state = line_state;
 652         spin_unlock_irqrestore(&priv->lock, flags);
 653         dbg("%s - read line state 0x%lx", __func__, line_state);
 654         return (int)line_state;
 655 }
 656
 657 static int klsi_105_tiocmset(struct tty_struct *tty,
 658                              unsigned int set, unsigned int clear)
 659 {
 660         int retval = -EINVAL;
 661
 662 /* if this ever gets implemented, it should be done something like this:
 663         struct usb_serial *serial = port->serial;
 664         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 665         unsigned long flags;
 666         int control;
 667
 668         spin_lock_irqsave (&priv->lock, flags);
 669         if (set & TIOCM_RTS)
 670                 priv->control_state |= TIOCM_RTS;
 671         if (set & TIOCM_DTR)
 672                 priv->control_state |= TIOCM_DTR;
 673         if (clear & TIOCM_RTS)
 674                 priv->control_state &= ~TIOCM_RTS;
 675         if (clear & TIOCM_DTR)
 676                 priv->control_state &= ~TIOCM_DTR;
 677         control = priv->control_state;
 678         spin_unlock_irqrestore (&priv->lock, flags);
 679         retval = mct_u232_set_modem_ctrl(serial, control);
 680 */
 681         return retval;
 682 }
 683
 684 module_usb_serial_driver(kl5kusb105d_driver, serial_drivers);
 685
 686 MODULE_AUTHOR(DRIVER_AUTHOR);
 687 MODULE_DESCRIPTION(DRIVER_DESC);
 688 MODULE_LICENSE("GPL");
 689
 690 module_param(debug, bool, S_IRUGO | S_IWUSR);
 691 MODULE_PARM_DESC(debug, "enable extensive debugging messages");