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 int 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         .no_dynamic_id =        1,
  95 };
  96
  97 static struct usb_serial_driver kl5kusb105d_device = {
  98         .driver = {
  99                 .owner =        THIS_MODULE,
 100                 .name =         "kl5kusb105d",
 101         },
 102         .description =          "KL5KUSB105D / PalmConnect",
 103         .usb_driver =           &kl5kusb105d_driver,
 104         .id_table =             id_table,
 105         .num_ports =            1,
 106         .bulk_out_size =        64,
 107         .open =                 klsi_105_open,
 108         .close =                klsi_105_close,
 109         .set_termios =          klsi_105_set_termios,
 110         /*.break_ctl =          klsi_105_break_ctl,*/
 111         .tiocmget =             klsi_105_tiocmget,
 112         .tiocmset =             klsi_105_tiocmset,
 113         .attach =               klsi_105_startup,
 114         .release =              klsi_105_release,
 115         .throttle =             usb_serial_generic_throttle,
 116         .unthrottle =           usb_serial_generic_unthrottle,
 117         .process_read_urb =     klsi_105_process_read_urb,
 118         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 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 != KLSI_STATUSBUF_LEN) {
 213                 dev_err(&port->dev, "reading line status failed: %d\n", rc);
 214                 if (rc >= 0)
 215                         rc = -EIO;
 216         } else {
 217                 status = get_unaligned_le16(status_buf);
 218
 219                 dev_info(&port->serial->dev->dev, "read status %x %x",
 220                          status_buf[0], status_buf[1]);
 221
 222                 *line_state_p = klsi_105_status2linestate(status);
 223         }
 224
 225         kfree(status_buf);
 226         return rc;
 227 }
 228
 229
 230 /*
 231  * Driver's tty interface functions
 232  */
 233
 234 static int klsi_105_startup(struct usb_serial *serial)
 235 {
 236         struct klsi_105_private *priv;
 237         int i;
 238
 239         /* check if we support the product id (see keyspan.c)
 240          * FIXME
 241          */
 242
 243         /* allocate the private data structure */
 244         for (i = 0; i < serial->num_ports; i++) {
 245                 priv = kmalloc(sizeof(struct klsi_105_private),
 246                                                    GFP_KERNEL);
 247                 if (!priv) {
 248                         dbg("%skmalloc for klsi_105_private failed.", __func__);
 249                         i--;
 250                         goto err_cleanup;
 251                 }
 252                 /* set initial values for control structures */
 253                 priv->cfg.pktlen    = 5;
 254                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 255                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 256                 priv->cfg.unknown1  = 0;
 257                 priv->cfg.unknown2  = 1;
 258
 259                 priv->line_state    = 0;
 260
 261                 usb_set_serial_port_data(serial->port[i], priv);
 262
 263                 spin_lock_init(&priv->lock);
 264
 265                 /* priv->termios is left uninitialized until port opening */
 266                 init_waitqueue_head(&serial->port[i]->write_wait);
 267         }
 268
 269         return 0;
 270
 271 err_cleanup:
 272         for (; i >= 0; i--) {
 273                 priv = usb_get_serial_port_data(serial->port[i]);
 274                 kfree(priv);
 275                 usb_set_serial_port_data(serial->port[i], NULL);
 276         }
 277         return -ENOMEM;
 278 }
 279
 280 static void klsi_105_release(struct usb_serial *serial)
 281 {
 282         int i;
 283
 284         dbg("%s", __func__);
 285
 286         for (i = 0; i < serial->num_ports; ++i)
 287                 kfree(usb_get_serial_port_data(serial->port[i]));
 288 }
 289
 290 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 291 {
 292         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 293         int retval = 0;
 294         int rc;
 295         int i;
 296         unsigned long line_state;
 297         struct klsi_105_port_settings *cfg;
 298         unsigned long flags;
 299
 300         dbg("%s port %d", __func__, port->number);
 301
 302         /* Do a defined restart:
 303          * Set up sane default baud rate and send the 'READ_ON'
 304          * vendor command.
 305          * FIXME: set modem line control (how?)
 306          * Then read the modem line control and store values in
 307          * priv->line_state.
 308          */
 309         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 310         if (!cfg) {
 311                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 312                                 __func__);
 313                 return -ENOMEM;
 314         }
 315         cfg->pktlen   = 5;
 316         cfg->baudrate = kl5kusb105a_sio_b9600;
 317         cfg->databits = kl5kusb105a_dtb_8;
 318         cfg->unknown1 = 0;
 319         cfg->unknown2 = 1;
 320         klsi_105_chg_port_settings(port, cfg);
 321
 322         /* set up termios structure */
 323         spin_lock_irqsave(&priv->lock, flags);
 324         priv->termios.c_iflag = tty->termios->c_iflag;
 325         priv->termios.c_oflag = tty->termios->c_oflag;
 326         priv->termios.c_cflag = tty->termios->c_cflag;
 327         priv->termios.c_lflag = tty->termios->c_lflag;
 328         for (i = 0; i < NCCS; i++)
 329                 priv->termios.c_cc[i] = tty->termios->c_cc[i];
 330         priv->cfg.pktlen   = cfg->pktlen;
 331         priv->cfg.baudrate = cfg->baudrate;
 332         priv->cfg.databits = cfg->databits;
 333         priv->cfg.unknown1 = cfg->unknown1;
 334         priv->cfg.unknown2 = cfg->unknown2;
 335         spin_unlock_irqrestore(&priv->lock, flags);
 336
 337         /* READ_ON and urb submission */
 338         rc = usb_serial_generic_open(tty, port);
 339         if (rc) {
 340                 retval = rc;
 341                 goto err_free_cfg;
 342         }
 343
 344         rc = usb_control_msg(port->serial->dev,
 345                              usb_sndctrlpipe(port->serial->dev, 0),
 346                              KL5KUSB105A_SIO_CONFIGURE,
 347                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 348                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 349                              0, /* index */
 350                              NULL,
 351                              0,
 352                              KLSI_TIMEOUT);
 353         if (rc < 0) {
 354                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 355                 retval = rc;
 356         } else
 357                 dbg("%s - enabled reading", __func__);
 358
 359         rc = klsi_105_get_line_state(port, &line_state);
 360         if (rc < 0) {
 361                 retval = rc;
 362                 goto err_disable_read;
 363         }
 364
 365         spin_lock_irqsave(&priv->lock, flags);
 366         priv->line_state = line_state;
 367         spin_unlock_irqrestore(&priv->lock, flags);
 368         dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
 369                         line_state);
 370
 371         return 0;
 372
 373 err_disable_read:
 374         usb_control_msg(port->serial->dev,
 375                              usb_sndctrlpipe(port->serial->dev, 0),
 376                              KL5KUSB105A_SIO_CONFIGURE,
 377                              USB_TYPE_VENDOR | USB_DIR_OUT,
 378                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 379                              0, /* index */
 380                              NULL, 0,
 381                              KLSI_TIMEOUT);
 382         usb_serial_generic_close(port);
 383 err_free_cfg:
 384         kfree(cfg);
 385
 386         return retval;
 387 }
 388
 389 static void klsi_105_close(struct usb_serial_port *port)
 390 {
 391         int rc;
 392
 393         dbg("%s port %d", __func__, port->number);
 394
 395         mutex_lock(&port->serial->disc_mutex);
 396         if (!port->serial->disconnected) {
 397                 /* send READ_OFF */
 398                 rc = usb_control_msg(port->serial->dev,
 399                                      usb_sndctrlpipe(port->serial->dev, 0),
 400                                      KL5KUSB105A_SIO_CONFIGURE,
 401                                      USB_TYPE_VENDOR | USB_DIR_OUT,
 402                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 403                                      0, /* index */
 404                                      NULL, 0,
 405                                      KLSI_TIMEOUT);
 406                 if (rc < 0)
 407                         dev_err(&port->dev,
 408                                 "Disabling read failed (error = %d)\n", rc);
 409         }
 410         mutex_unlock(&port->serial->disc_mutex);
 411
 412         /* shutdown our bulk reads and writes */
 413         usb_serial_generic_close(port);
 414
 415         /* wgg - do I need this? I think so. */
 416         usb_kill_urb(port->interrupt_in_urb);
 417 }
 418
 419 /* We need to write a complete 64-byte data block and encode the
 420  * number actually sent in the first double-byte, LSB-order. That
 421  * leaves at most 62 bytes of payload.
 422  */
 423 #define KLSI_HDR_LEN            2
 424 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 425                                                 void *dest, size_t size)
 426 {
 427         unsigned char *buf = dest;
 428         int count;
 429
 430         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 431                                                                 &port->lock);
 432         put_unaligned_le16(count, buf);
 433
 434         return count + KLSI_HDR_LEN;
 435 }
 436
 437 /* The data received is preceded by a length double-byte in LSB-first order.
 438  */
 439 static void klsi_105_process_read_urb(struct urb *urb)
 440 {
 441         struct usb_serial_port *port = urb->context;
 442         unsigned char *data = urb->transfer_buffer;
 443         struct tty_struct *tty;
 444         unsigned len;
 445
 446         /* empty urbs seem to happen, we ignore them */
 447         if (!urb->actual_length)
 448                 return;
 449
 450         if (urb->actual_length <= KLSI_HDR_LEN) {
 451                 dbg("%s - malformed packet", __func__);
 452                 return;
 453         }
 454
 455         tty = tty_port_tty_get(&port->port);
 456         if (!tty)
 457                 return;
 458
 459         len = get_unaligned_le16(data);
 460         if (len > urb->actual_length - KLSI_HDR_LEN) {
 461                 dbg("%s - packet length mismatch", __func__);
 462                 len = urb->actual_length - KLSI_HDR_LEN;
 463         }
 464
 465         tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
 466         tty_flip_buffer_push(tty);
 467         tty_kref_put(tty);
 468 }
 469
 470 static void klsi_105_set_termios(struct tty_struct *tty,
 471                                  struct usb_serial_port *port,
 472                                  struct ktermios *old_termios)
 473 {
 474         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 475         unsigned int iflag = tty->termios->c_iflag;
 476         unsigned int old_iflag = old_termios->c_iflag;
 477         unsigned int cflag = tty->termios->c_cflag;
 478         unsigned int old_cflag = old_termios->c_cflag;
 479         struct klsi_105_port_settings *cfg;
 480         unsigned long flags;
 481         speed_t baud;
 482
 483         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 484         if (!cfg) {
 485                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 486                                 __func__);
 487                 return;
 488         }
 489
 490         /* lock while we are modifying the settings */
 491         spin_lock_irqsave(&priv->lock, flags);
 492
 493         /*
 494          * Update baud rate
 495          */
 496         baud = tty_get_baud_rate(tty);
 497
 498         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 499                 /* reassert DTR and (maybe) RTS on transition from B0 */
 500                 if ((old_cflag & CBAUD) == B0) {
 501                         dbg("%s: baud was B0", __func__);
 502 #if 0
 503                         priv->control_state |= TIOCM_DTR;
 504                         /* don't set RTS if using hardware flow control */
 505                         if (!(old_cflag & CRTSCTS))
 506                                 priv->control_state |= TIOCM_RTS;
 507                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 508 #endif
 509                 }
 510         }
 511         switch (baud) {
 512         case 0: /* handled below */
 513                 break;
 514         case 1200:
 515                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 516                 break;
 517         case 2400:
 518                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 519                 break;
 520         case 4800:
 521                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 522                 break;
 523         case 9600:
 524                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 525                 break;
 526         case 19200:
 527                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 528                 break;
 529         case 38400:
 530                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 531                 break;
 532         case 57600:
 533                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 534                 break;
 535         case 115200:
 536                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 537                 break;
 538         default:
 539                 dbg("KLSI USB->Serial converter:"
 540                     " unsupported baudrate request, using default of 9600");
 541                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 542                 baud = 9600;
 543                 break;
 544         }
 545         if ((cflag & CBAUD) == B0) {
 546                 dbg("%s: baud is B0", __func__);
 547                 /* Drop RTS and DTR */
 548                 /* maybe this should be simulated by sending read
 549                  * disable and read enable messages?
 550                  */
 551                 ;
 552 #if 0
 553                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 554                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 555 #endif
 556         }
 557         tty_encode_baud_rate(tty, baud, baud);
 558
 559         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 560                 /* set the number of data bits */
 561                 switch (cflag & CSIZE) {
 562                 case CS5:
 563                         dbg("%s - 5 bits/byte not supported", __func__);
 564                         spin_unlock_irqrestore(&priv->lock, flags);
 565                         goto err;
 566                 case CS6:
 567                         dbg("%s - 6 bits/byte not supported", __func__);
 568                         spin_unlock_irqrestore(&priv->lock, flags);
 569                         goto err;
 570                 case CS7:
 571                         priv->cfg.databits = kl5kusb105a_dtb_7;
 572                         break;
 573                 case CS8:
 574                         priv->cfg.databits = kl5kusb105a_dtb_8;
 575                         break;
 576                 default:
 577                         dev_err(&port->dev,
 578                                 "CSIZE was not CS5-CS8, using default of 8\n");
 579                         priv->cfg.databits = kl5kusb105a_dtb_8;
 580                         break;
 581                 }
 582         }
 583
 584         /*
 585          * Update line control register (LCR)
 586          */
 587         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 588             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 589                 /* Not currently supported */
 590                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 591 #if 0
 592                 priv->last_lcr = 0;
 593
 594                 /* set the parity */
 595                 if (cflag & PARENB)
 596                         priv->last_lcr |= (cflag & PARODD) ?
 597                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 598                 else
 599                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 600
 601                 /* set the number of stop bits */
 602                 priv->last_lcr |= (cflag & CSTOPB) ?
 603                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 604
 605                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 606 #endif
 607                 ;
 608         }
 609         /*
 610          * Set flow control: well, I do not really now how to handle DTR/RTS.
 611          * Just do what we have seen with SniffUSB on Win98.
 612          */
 613         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 614             || (iflag & IXON) != (old_iflag & IXON)
 615             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 616                 /* Not currently supported */
 617                 tty->termios->c_cflag &= ~CRTSCTS;
 618                 /* Drop DTR/RTS if no flow control otherwise assert */
 619 #if 0
 620                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 621                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 622                 else
 623                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 624                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 625 #endif
 626                 ;
 627         }
 628         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 629         spin_unlock_irqrestore(&priv->lock, flags);
 630
 631         /* now commit changes to device */
 632         klsi_105_chg_port_settings(port, cfg);
 633 err:
 634         kfree(cfg);
 635 }
 636
 637 #if 0
 638 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 639 {
 640         struct usb_serial_port *port = tty->driver_data;
 641         struct usb_serial *serial = port->serial;
 642         struct mct_u232_private *priv =
 643                                 (struct mct_u232_private *)port->private;
 644         unsigned char lcr = priv->last_lcr;
 645
 646         dbg("%sstate=%d", __func__, break_state);
 647
 648         /* LOCKING */
 649         if (break_state)
 650                 lcr |= MCT_U232_SET_BREAK;
 651
 652         mct_u232_set_line_ctrl(serial, lcr);
 653 }
 654 #endif
 655
 656 static int klsi_105_tiocmget(struct tty_struct *tty)
 657 {
 658         struct usb_serial_port *port = tty->driver_data;
 659         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 660         unsigned long flags;
 661         int rc;
 662         unsigned long line_state;
 663         dbg("%s - request, just guessing", __func__);
 664
 665         rc = klsi_105_get_line_state(port, &line_state);
 666         if (rc < 0) {
 667                 dev_err(&port->dev,
 668                         "Reading line control failed (error = %d)\n", rc);
 669                 /* better return value? EAGAIN? */
 670                 return rc;
 671         }
 672
 673         spin_lock_irqsave(&priv->lock, flags);
 674         priv->line_state = line_state;
 675         spin_unlock_irqrestore(&priv->lock, flags);
 676         dbg("%s - read line state 0x%lx", __func__, line_state);
 677         return (int)line_state;
 678 }
 679
 680 static int klsi_105_tiocmset(struct tty_struct *tty,
 681                              unsigned int set, unsigned int clear)
 682 {
 683         int retval = -EINVAL;
 684
 685         dbg("%s", __func__);
 686
 687 /* if this ever gets implemented, it should be done something like this:
 688         struct usb_serial *serial = port->serial;
 689         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 690         unsigned long flags;
 691         int control;
 692
 693         spin_lock_irqsave (&priv->lock, flags);
 694         if (set & TIOCM_RTS)
 695                 priv->control_state |= TIOCM_RTS;
 696         if (set & TIOCM_DTR)
 697                 priv->control_state |= TIOCM_DTR;
 698         if (clear & TIOCM_RTS)
 699                 priv->control_state &= ~TIOCM_RTS;
 700         if (clear & TIOCM_DTR)
 701                 priv->control_state &= ~TIOCM_DTR;
 702         control = priv->control_state;
 703         spin_unlock_irqrestore (&priv->lock, flags);
 704         retval = mct_u232_set_modem_ctrl(serial, control);
 705 */
 706         return retval;
 707 }
 708
 709
 710 static int __init klsi_105_init(void)
 711 {
 712         int retval;
 713         retval = usb_serial_register(&kl5kusb105d_device);
 714         if (retval)
 715                 goto failed_usb_serial_register;
 716         retval = usb_register(&kl5kusb105d_driver);
 717         if (retval)
 718                 goto failed_usb_register;
 719
 720         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 721                DRIVER_DESC "\n");
 722         return 0;
 723 failed_usb_register:
 724         usb_serial_deregister(&kl5kusb105d_device);
 725 failed_usb_serial_register:
 726         return retval;
 727 }
 728
 729 static void __exit klsi_105_exit(void)
 730 {
 731         usb_deregister(&kl5kusb105d_driver);
 732         usb_serial_deregister(&kl5kusb105d_device);
 733 }
 734
 735
 736 module_init(klsi_105_init);
 737 module_exit(klsi_105_exit);
 738
 739 MODULE_AUTHOR(DRIVER_AUTHOR);
 740 MODULE_DESCRIPTION(DRIVER_DESC);
 741 MODULE_LICENSE("GPL");
 742
 743
 744 module_param(debug, bool, S_IRUGO | S_IWUSR);
 745 MODULE_PARM_DESC(debug, "enable extensive debugging messages");