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