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