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