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                 goto err_generic_close;
 357         } else
 358                 dbg("%s - enabled reading", __func__);
 359
 360         rc = klsi_105_get_line_state(port, &line_state);
 361         if (rc < 0) {
 362                 retval = rc;
 363                 goto err_disable_read;
 364         }
 365
 366         spin_lock_irqsave(&priv->lock, flags);
 367         priv->line_state = line_state;
 368         spin_unlock_irqrestore(&priv->lock, flags);
 369         dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
 370                         line_state);
 371
 372         return 0;
 373
 374 err_disable_read:
 375         usb_control_msg(port->serial->dev,
 376                              usb_sndctrlpipe(port->serial->dev, 0),
 377                              KL5KUSB105A_SIO_CONFIGURE,
 378                              USB_TYPE_VENDOR | USB_DIR_OUT,
 379                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 380                              0, /* index */
 381                              NULL, 0,
 382                              KLSI_TIMEOUT);
 383 err_generic_close:
 384         usb_serial_generic_close(port);
 385 err_free_cfg:
 386         kfree(cfg);
 387
 388         return retval;
 389 }
 390
 391 static void klsi_105_close(struct usb_serial_port *port)
 392 {
 393         int rc;
 394
 395         dbg("%s port %d", __func__, port->number);
 396
 397         mutex_lock(&port->serial->disc_mutex);
 398         if (!port->serial->disconnected) {
 399                 /* send READ_OFF */
 400                 rc = usb_control_msg(port->serial->dev,
 401                                      usb_sndctrlpipe(port->serial->dev, 0),
 402                                      KL5KUSB105A_SIO_CONFIGURE,
 403                                      USB_TYPE_VENDOR | USB_DIR_OUT,
 404                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 405                                      0, /* index */
 406                                      NULL, 0,
 407                                      KLSI_TIMEOUT);
 408                 if (rc < 0)
 409                         dev_err(&port->dev,
 410                                 "Disabling read failed (error = %d)\n", rc);
 411         }
 412         mutex_unlock(&port->serial->disc_mutex);
 413
 414         /* shutdown our bulk reads and writes */
 415         usb_serial_generic_close(port);
 416
 417         /* wgg - do I need this? I think so. */
 418         usb_kill_urb(port->interrupt_in_urb);
 419 }
 420
 421 /* We need to write a complete 64-byte data block and encode the
 422  * number actually sent in the first double-byte, LSB-order. That
 423  * leaves at most 62 bytes of payload.
 424  */
 425 #define KLSI_HDR_LEN            2
 426 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 427                                                 void *dest, size_t size)
 428 {
 429         unsigned char *buf = dest;
 430         int count;
 431
 432         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 433                                                                 &port->lock);
 434         put_unaligned_le16(count, buf);
 435
 436         return count + KLSI_HDR_LEN;
 437 }
 438
 439 /* The data received is preceded by a length double-byte in LSB-first order.
 440  */
 441 static void klsi_105_process_read_urb(struct urb *urb)
 442 {
 443         struct usb_serial_port *port = urb->context;
 444         unsigned char *data = urb->transfer_buffer;
 445         struct tty_struct *tty;
 446         unsigned len;
 447
 448         /* empty urbs seem to happen, we ignore them */
 449         if (!urb->actual_length)
 450                 return;
 451
 452         if (urb->actual_length <= KLSI_HDR_LEN) {
 453                 dbg("%s - malformed packet", __func__);
 454                 return;
 455         }
 456
 457         tty = tty_port_tty_get(&port->port);
 458         if (!tty)
 459                 return;
 460
 461         len = get_unaligned_le16(data);
 462         if (len > urb->actual_length - KLSI_HDR_LEN) {
 463                 dbg("%s - packet length mismatch", __func__);
 464                 len = urb->actual_length - KLSI_HDR_LEN;
 465         }
 466
 467         tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
 468         tty_flip_buffer_push(tty);
 469         tty_kref_put(tty);
 470 }
 471
 472 static void klsi_105_set_termios(struct tty_struct *tty,
 473                                  struct usb_serial_port *port,
 474                                  struct ktermios *old_termios)
 475 {
 476         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 477         unsigned int iflag = tty->termios->c_iflag;
 478         unsigned int old_iflag = old_termios->c_iflag;
 479         unsigned int cflag = tty->termios->c_cflag;
 480         unsigned int old_cflag = old_termios->c_cflag;
 481         struct klsi_105_port_settings *cfg;
 482         unsigned long flags;
 483         speed_t baud;
 484
 485         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 486         if (!cfg) {
 487                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 488                                 __func__);
 489                 return;
 490         }
 491
 492         /* lock while we are modifying the settings */
 493         spin_lock_irqsave(&priv->lock, flags);
 494
 495         /*
 496          * Update baud rate
 497          */
 498         baud = tty_get_baud_rate(tty);
 499
 500         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 501                 /* reassert DTR and (maybe) RTS on transition from B0 */
 502                 if ((old_cflag & CBAUD) == B0) {
 503                         dbg("%s: baud was B0", __func__);
 504 #if 0
 505                         priv->control_state |= TIOCM_DTR;
 506                         /* don't set RTS if using hardware flow control */
 507                         if (!(old_cflag & CRTSCTS))
 508                                 priv->control_state |= TIOCM_RTS;
 509                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 510 #endif
 511                 }
 512         }
 513         switch (baud) {
 514         case 0: /* handled below */
 515                 break;
 516         case 1200:
 517                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 518                 break;
 519         case 2400:
 520                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 521                 break;
 522         case 4800:
 523                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 524                 break;
 525         case 9600:
 526                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 527                 break;
 528         case 19200:
 529                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 530                 break;
 531         case 38400:
 532                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 533                 break;
 534         case 57600:
 535                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 536                 break;
 537         case 115200:
 538                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 539                 break;
 540         default:
 541                 dbg("KLSI USB->Serial converter:"
 542                     " unsupported baudrate request, using default of 9600");
 543                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 544                 baud = 9600;
 545                 break;
 546         }
 547         if ((cflag & CBAUD) == B0) {
 548                 dbg("%s: baud is B0", __func__);
 549                 /* Drop RTS and DTR */
 550                 /* maybe this should be simulated by sending read
 551                  * disable and read enable messages?
 552                  */
 553                 ;
 554 #if 0
 555                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 556                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 557 #endif
 558         }
 559         tty_encode_baud_rate(tty, baud, baud);
 560
 561         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 562                 /* set the number of data bits */
 563                 switch (cflag & CSIZE) {
 564                 case CS5:
 565                         dbg("%s - 5 bits/byte not supported", __func__);
 566                         spin_unlock_irqrestore(&priv->lock, flags);
 567                         goto err;
 568                 case CS6:
 569                         dbg("%s - 6 bits/byte not supported", __func__);
 570                         spin_unlock_irqrestore(&priv->lock, flags);
 571                         goto err;
 572                 case CS7:
 573                         priv->cfg.databits = kl5kusb105a_dtb_7;
 574                         break;
 575                 case CS8:
 576                         priv->cfg.databits = kl5kusb105a_dtb_8;
 577                         break;
 578                 default:
 579                         dev_err(&port->dev,
 580                                 "CSIZE was not CS5-CS8, using default of 8\n");
 581                         priv->cfg.databits = kl5kusb105a_dtb_8;
 582                         break;
 583                 }
 584         }
 585
 586         /*
 587          * Update line control register (LCR)
 588          */
 589         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 590             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 591                 /* Not currently supported */
 592                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 593 #if 0
 594                 priv->last_lcr = 0;
 595
 596                 /* set the parity */
 597                 if (cflag & PARENB)
 598                         priv->last_lcr |= (cflag & PARODD) ?
 599                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 600                 else
 601                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 602
 603                 /* set the number of stop bits */
 604                 priv->last_lcr |= (cflag & CSTOPB) ?
 605                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 606
 607                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 608 #endif
 609                 ;
 610         }
 611         /*
 612          * Set flow control: well, I do not really now how to handle DTR/RTS.
 613          * Just do what we have seen with SniffUSB on Win98.
 614          */
 615         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 616             || (iflag & IXON) != (old_iflag & IXON)
 617             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 618                 /* Not currently supported */
 619                 tty->termios->c_cflag &= ~CRTSCTS;
 620                 /* Drop DTR/RTS if no flow control otherwise assert */
 621 #if 0
 622                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 623                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 624                 else
 625                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 626                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 627 #endif
 628                 ;
 629         }
 630         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 631         spin_unlock_irqrestore(&priv->lock, flags);
 632
 633         /* now commit changes to device */
 634         klsi_105_chg_port_settings(port, cfg);
 635 err:
 636         kfree(cfg);
 637 }
 638
 639 #if 0
 640 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 641 {
 642         struct usb_serial_port *port = tty->driver_data;
 643         struct usb_serial *serial = port->serial;
 644         struct mct_u232_private *priv =
 645                                 (struct mct_u232_private *)port->private;
 646         unsigned char lcr = priv->last_lcr;
 647
 648         dbg("%sstate=%d", __func__, break_state);
 649
 650         /* LOCKING */
 651         if (break_state)
 652                 lcr |= MCT_U232_SET_BREAK;
 653
 654         mct_u232_set_line_ctrl(serial, lcr);
 655 }
 656 #endif
 657
 658 static int klsi_105_tiocmget(struct tty_struct *tty)
 659 {
 660         struct usb_serial_port *port = tty->driver_data;
 661         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 662         unsigned long flags;
 663         int rc;
 664         unsigned long line_state;
 665         dbg("%s - request, just guessing", __func__);
 666
 667         rc = klsi_105_get_line_state(port, &line_state);
 668         if (rc < 0) {
 669                 dev_err(&port->dev,
 670                         "Reading line control failed (error = %d)\n", rc);
 671                 /* better return value? EAGAIN? */
 672                 return rc;
 673         }
 674
 675         spin_lock_irqsave(&priv->lock, flags);
 676         priv->line_state = line_state;
 677         spin_unlock_irqrestore(&priv->lock, flags);
 678         dbg("%s - read line state 0x%lx", __func__, line_state);
 679         return (int)line_state;
 680 }
 681
 682 static int klsi_105_tiocmset(struct tty_struct *tty,
 683                              unsigned int set, unsigned int clear)
 684 {
 685         int retval = -EINVAL;
 686
 687         dbg("%s", __func__);
 688
 689 /* if this ever gets implemented, it should be done something like this:
 690         struct usb_serial *serial = port->serial;
 691         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 692         unsigned long flags;
 693         int control;
 694
 695         spin_lock_irqsave (&priv->lock, flags);
 696         if (set & TIOCM_RTS)
 697                 priv->control_state |= TIOCM_RTS;
 698         if (set & TIOCM_DTR)
 699                 priv->control_state |= TIOCM_DTR;
 700         if (clear & TIOCM_RTS)
 701                 priv->control_state &= ~TIOCM_RTS;
 702         if (clear & TIOCM_DTR)
 703                 priv->control_state &= ~TIOCM_DTR;
 704         control = priv->control_state;
 705         spin_unlock_irqrestore (&priv->lock, flags);
 706         retval = mct_u232_set_modem_ctrl(serial, control);
 707 */
 708         return retval;
 709 }
 710
 711
 712 static int __init klsi_105_init(void)
 713 {
 714         int retval;
 715         retval = usb_serial_register(&kl5kusb105d_device);
 716         if (retval)
 717                 goto failed_usb_serial_register;
 718         retval = usb_register(&kl5kusb105d_driver);
 719         if (retval)
 720                 goto failed_usb_register;
 721
 722         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 723                DRIVER_DESC "\n");
 724         return 0;
 725 failed_usb_register:
 726         usb_serial_deregister(&kl5kusb105d_device);
 727 failed_usb_serial_register:
 728         return retval;
 729 }
 730
 731 static void __exit klsi_105_exit(void)
 732 {
 733         usb_deregister(&kl5kusb105d_driver);
 734         usb_serial_deregister(&kl5kusb105d_device);
 735 }
 736
 737
 738 module_init(klsi_105_init);
 739 module_exit(klsi_105_exit);
 740
 741 MODULE_AUTHOR(DRIVER_AUTHOR);
 742 MODULE_DESCRIPTION(DRIVER_DESC);
 743 MODULE_LICENSE("GPL");
 744
 745
 746 module_param(debug, bool, S_IRUGO | S_IWUSR);
 747 MODULE_PARM_DESC(debug, "enable extensive debugging messages");