drivers/usb/serial/kl5kusb105.c

   1 /*
   2  * KLSI KL5KUSB105 chip RS232 converter driver
   3  *
   4  *   Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
   5  *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  * All information about the device was acquired using SniffUSB ans snoopUSB
  13  * on Windows98.
  14  * It was written out of frustration with the PalmConnect USB Serial adapter
  15  * sold by Palm Inc.
  16  * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
  17  * information that was not already available.
  18  *
  19  * It seems that KLSI bought some silicon-design information from ScanLogic,
  20  * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
  21  * KLSI has firmware available for their devices; it is probable that the
  22  * firmware differs from that used by KLSI in their products. If you have an
  23  * original KLSI device and can provide some information on it, I would be
  24  * most interested in adding support for it here. If you have any information
  25  * on the protocol used (or find errors in my reverse-engineered stuff), please
  26  * let me know.
  27  *
  28  * The code was only tested with a PalmConnect USB adapter; if you
  29  * are adventurous, try it with any KLSI-based device and let me know how it
  30  * breaks so that I can fix it!
  31  */
  32
  33 /* TODO:
  34  *      check modem line signals
  35  *      implement handshaking or decide that we do not support it
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/tty.h>
  43 #include <linux/tty_driver.h>
  44 #include <linux/tty_flip.h>
  45 #include <linux/module.h>
  46 #include <linux/uaccess.h>
  47 #include <asm/unaligned.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb/serial.h>
  50 #include "kl5kusb105.h"
  51
  52 static bool debug;
  53
  54 /*
  55  * Version Information
  56  */
  57 #define DRIVER_VERSION "v0.4"
  58 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
  59 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  60
  61
  62 /*
  63  * Function prototypes
  64  */
  65 static int  klsi_105_startup(struct usb_serial *serial);
  66 static void klsi_105_release(struct usb_serial *serial);
  67 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
  68 static void klsi_105_close(struct usb_serial_port *port);
  69 static void klsi_105_set_termios(struct tty_struct *tty,
  70                         struct usb_serial_port *port, struct ktermios *old);
  71 static int  klsi_105_tiocmget(struct tty_struct *tty);
  72 static int  klsi_105_tiocmset(struct tty_struct *tty,
  73                         unsigned int set, unsigned int clear);
  74 static void klsi_105_process_read_urb(struct urb *urb);
  75 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
  76                                                 void *dest, size_t size);
  77
  78 /*
  79  * All of the device info needed for the KLSI converters.
  80  */
  81 static const struct usb_device_id id_table[] = {
  82         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
  83         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
  84         { }             /* Terminating entry */
  85 };
  86
  87 MODULE_DEVICE_TABLE(usb, id_table);
  88
  89 static struct usb_driver kl5kusb105d_driver = {
  90         .name =         "kl5kusb105d",
  91         .probe =        usb_serial_probe,
  92         .disconnect =   usb_serial_disconnect,
  93         .id_table =     id_table,
  94 };
  95
  96 static struct usb_serial_driver kl5kusb105d_device = {
  97         .driver = {
  98                 .owner =        THIS_MODULE,
  99                 .name =         "kl5kusb105d",
 100         },
 101         .description =          "KL5KUSB105D / PalmConnect",
 102         .id_table =             id_table,
 103         .num_ports =            1,
 104         .bulk_out_size =        64,
 105         .open =                 klsi_105_open,
 106         .close =                klsi_105_close,
 107         .set_termios =          klsi_105_set_termios,
 108         /*.break_ctl =          klsi_105_break_ctl,*/
 109         .tiocmget =             klsi_105_tiocmget,
 110         .tiocmset =             klsi_105_tiocmset,
 111         .attach =               klsi_105_startup,
 112         .release =              klsi_105_release,
 113         .throttle =             usb_serial_generic_throttle,
 114         .unthrottle =           usb_serial_generic_unthrottle,
 115         .process_read_urb =     klsi_105_process_read_urb,
 116         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 117 };
 118
 119 static struct usb_serial_driver * const serial_drivers[] = {
 120         &kl5kusb105d_device, NULL
 121 };
 122
 123 struct klsi_105_port_settings {
 124         __u8    pktlen;         /* always 5, it seems */
 125         __u8    baudrate;
 126         __u8    databits;
 127         __u8    unknown1;
 128         __u8    unknown2;
 129 } __attribute__ ((packed));
 130
 131 struct klsi_105_private {
 132         struct klsi_105_port_settings   cfg;
 133         struct ktermios                 termios;
 134         unsigned long                   line_state; /* modem line settings */
 135         spinlock_t                      lock;
 136 };
 137
 138
 139 /*
 140  * Handle vendor specific USB requests
 141  */
 142
 143
 144 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 145
 146 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 147                                       struct klsi_105_port_settings *settings)
 148 {
 149         int rc;
 150
 151         rc = usb_control_msg(port->serial->dev,
 152                         usb_sndctrlpipe(port->serial->dev, 0),
 153                         KL5KUSB105A_SIO_SET_DATA,
 154                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 155                         0, /* value */
 156                         0, /* index */
 157                         settings,
 158                         sizeof(struct klsi_105_port_settings),
 159                         KLSI_TIMEOUT);
 160         if (rc < 0)
 161                 dev_err(&port->dev,
 162                         "Change port settings failed (error = %d)\n", rc);
 163         dev_info(&port->serial->dev->dev,
 164                  "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
 165                  settings->pktlen, settings->baudrate, settings->databits,
 166                  settings->unknown1, settings->unknown2);
 167         return rc;
 168 }
 169
 170 /* translate a 16-bit status value from the device to linux's TIO bits */
 171 static unsigned long klsi_105_status2linestate(const __u16 status)
 172 {
 173         unsigned long res = 0;
 174
 175         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 176               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 177               ;
 178
 179         return res;
 180 }
 181
 182 /*
 183  * Read line control via vendor command and return result through
 184  * *line_state_p
 185  */
 186 /* It seems that the status buffer has always only 2 bytes length */
 187 #define KLSI_STATUSBUF_LEN      2
 188 static int klsi_105_get_line_state(struct usb_serial_port *port,
 189                                    unsigned long *line_state_p)
 190 {
 191         int rc;
 192         u8 *status_buf;
 193         __u16 status;
 194
 195         dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
 196
 197         status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
 198         if (!status_buf) {
 199                 dev_err(&port->dev, "%s - out of memory for status buffer.\n",
 200                                 __func__);
 201                 return -ENOMEM;
 202         }
 203         status_buf[0] = 0xff;
 204         status_buf[1] = 0xff;
 205         rc = usb_control_msg(port->serial->dev,
 206                              usb_rcvctrlpipe(port->serial->dev, 0),
 207                              KL5KUSB105A_SIO_POLL,
 208                              USB_TYPE_VENDOR | USB_DIR_IN,
 209                              0, /* value */
 210                              0, /* index */
 211                              status_buf, KLSI_STATUSBUF_LEN,
 212                              10000
 213                              );
 214         if (rc < 0)
 215                 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
 216                         rc);
 217         else {
 218                 status = get_unaligned_le16(status_buf);
 219
 220                 dev_info(&port->serial->dev->dev, "read status %x %x",
 221                          status_buf[0], status_buf[1]);
 222
 223                 *line_state_p = klsi_105_status2linestate(status);
 224         }
 225
 226         kfree(status_buf);
 227         return rc;
 228 }
 229
 230
 231 /*
 232  * Driver's tty interface functions
 233  */
 234
 235 static int klsi_105_startup(struct usb_serial *serial)
 236 {
 237         struct klsi_105_private *priv;
 238         int i;
 239
 240         /* check if we support the product id (see keyspan.c)
 241          * FIXME
 242          */
 243
 244         /* allocate the private data structure */
 245         for (i = 0; i < serial->num_ports; i++) {
 246                 priv = kmalloc(sizeof(struct klsi_105_private),
 247                                                    GFP_KERNEL);
 248                 if (!priv) {
 249                         dbg("%skmalloc for klsi_105_private failed.", __func__);
 250                         i--;
 251                         goto err_cleanup;
 252                 }
 253                 /* set initial values for control structures */
 254                 priv->cfg.pktlen    = 5;
 255                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 256                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 257                 priv->cfg.unknown1  = 0;
 258                 priv->cfg.unknown2  = 1;
 259
 260                 priv->line_state    = 0;
 261
 262                 usb_set_serial_port_data(serial->port[i], priv);
 263
 264                 spin_lock_init(&priv->lock);
 265
 266                 /* priv->termios is left uninitialized until port opening */
 267                 init_waitqueue_head(&serial->port[i]->write_wait);
 268         }
 269
 270         return 0;
 271
 272 err_cleanup:
 273         for (; i >= 0; i--) {
 274                 priv = usb_get_serial_port_data(serial->port[i]);
 275                 kfree(priv);
 276                 usb_set_serial_port_data(serial->port[i], NULL);
 277         }
 278         return -ENOMEM;
 279 }
 280
 281 static void klsi_105_release(struct usb_serial *serial)
 282 {
 283         int i;
 284
 285         dbg("%s", __func__);
 286
 287         for (i = 0; i < serial->num_ports; ++i)
 288                 kfree(usb_get_serial_port_data(serial->port[i]));
 289 }
 290
 291 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 292 {
 293         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 294         int retval = 0;
 295         int rc;
 296         int i;
 297         unsigned long line_state;
 298         struct klsi_105_port_settings *cfg;
 299         unsigned long flags;
 300
 301         dbg("%s port %d", __func__, port->number);
 302
 303         /* Do a defined restart:
 304          * Set up sane default baud rate and send the 'READ_ON'
 305          * vendor command.
 306          * FIXME: set modem line control (how?)
 307          * Then read the modem line control and store values in
 308          * priv->line_state.
 309          */
 310         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 311         if (!cfg) {
 312                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 313                                 __func__);
 314                 return -ENOMEM;
 315         }
 316         cfg->pktlen   = 5;
 317         cfg->baudrate = kl5kusb105a_sio_b9600;
 318         cfg->databits = kl5kusb105a_dtb_8;
 319         cfg->unknown1 = 0;
 320         cfg->unknown2 = 1;
 321         klsi_105_chg_port_settings(port, cfg);
 322
 323         /* set up termios structure */
 324         spin_lock_irqsave(&priv->lock, flags);
 325         priv->termios.c_iflag = tty->termios->c_iflag;
 326         priv->termios.c_oflag = tty->termios->c_oflag;
 327         priv->termios.c_cflag = tty->termios->c_cflag;
 328         priv->termios.c_lflag = tty->termios->c_lflag;
 329         for (i = 0; i < NCCS; i++)
 330                 priv->termios.c_cc[i] = tty->termios->c_cc[i];
 331         priv->cfg.pktlen   = cfg->pktlen;
 332         priv->cfg.baudrate = cfg->baudrate;
 333         priv->cfg.databits = cfg->databits;
 334         priv->cfg.unknown1 = cfg->unknown1;
 335         priv->cfg.unknown2 = cfg->unknown2;
 336         spin_unlock_irqrestore(&priv->lock, flags);
 337
 338         /* READ_ON and urb submission */
 339         rc = usb_serial_generic_open(tty, port);
 340         if (rc) {
 341                 retval = rc;
 342                 goto exit;
 343         }
 344
 345         rc = usb_control_msg(port->serial->dev,
 346                              usb_sndctrlpipe(port->serial->dev, 0),
 347                              KL5KUSB105A_SIO_CONFIGURE,
 348                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 349                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 350                              0, /* index */
 351                              NULL,
 352                              0,
 353                              KLSI_TIMEOUT);
 354         if (rc < 0) {
 355                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 356                 retval = rc;
 357         } else
 358                 dbg("%s - enabled reading", __func__);
 359
 360         rc = klsi_105_get_line_state(port, &line_state);
 361         if (rc >= 0) {
 362                 spin_lock_irqsave(&priv->lock, flags);
 363                 priv->line_state = line_state;
 364                 spin_unlock_irqrestore(&priv->lock, flags);
 365                 dbg("%s - read line state 0x%lx", __func__, line_state);
 366                 retval = 0;
 367         } else
 368                 retval = rc;
 369
 370 exit:
 371         kfree(cfg);
 372         return retval;
 373 }
 374
 375 static void klsi_105_close(struct usb_serial_port *port)
 376 {
 377         int rc;
 378
 379         dbg("%s port %d", __func__, port->number);
 380
 381         mutex_lock(&port->serial->disc_mutex);
 382         if (!port->serial->disconnected) {
 383                 /* send READ_OFF */
 384                 rc = usb_control_msg(port->serial->dev,
 385                                      usb_sndctrlpipe(port->serial->dev, 0),
 386                                      KL5KUSB105A_SIO_CONFIGURE,
 387                                      USB_TYPE_VENDOR | USB_DIR_OUT,
 388                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 389                                      0, /* index */
 390                                      NULL, 0,
 391                                      KLSI_TIMEOUT);
 392                 if (rc < 0)
 393                         dev_err(&port->dev,
 394                                 "Disabling read failed (error = %d)\n", rc);
 395         }
 396         mutex_unlock(&port->serial->disc_mutex);
 397
 398         /* shutdown our bulk reads and writes */
 399         usb_serial_generic_close(port);
 400
 401         /* wgg - do I need this? I think so. */
 402         usb_kill_urb(port->interrupt_in_urb);
 403 }
 404
 405 /* We need to write a complete 64-byte data block and encode the
 406  * number actually sent in the first double-byte, LSB-order. That
 407  * leaves at most 62 bytes of payload.
 408  */
 409 #define KLSI_HDR_LEN            2
 410 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 411                                                 void *dest, size_t size)
 412 {
 413         unsigned char *buf = dest;
 414         int count;
 415
 416         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 417                                                                 &port->lock);
 418         put_unaligned_le16(count, buf);
 419
 420         return count + KLSI_HDR_LEN;
 421 }
 422
 423 /* The data received is preceded by a length double-byte in LSB-first order.
 424  */
 425 static void klsi_105_process_read_urb(struct urb *urb)
 426 {
 427         struct usb_serial_port *port = urb->context;
 428         unsigned char *data = urb->transfer_buffer;
 429         struct tty_struct *tty;
 430         unsigned len;
 431
 432         /* empty urbs seem to happen, we ignore them */
 433         if (!urb->actual_length)
 434                 return;
 435
 436         if (urb->actual_length <= KLSI_HDR_LEN) {
 437                 dbg("%s - malformed packet", __func__);
 438                 return;
 439         }
 440
 441         tty = tty_port_tty_get(&port->port);
 442         if (!tty)
 443                 return;
 444
 445         len = get_unaligned_le16(data);
 446         if (len > urb->actual_length - KLSI_HDR_LEN) {
 447                 dbg("%s - packet length mismatch", __func__);
 448                 len = urb->actual_length - KLSI_HDR_LEN;
 449         }
 450
 451         tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
 452         tty_flip_buffer_push(tty);
 453         tty_kref_put(tty);
 454 }
 455
 456 static void klsi_105_set_termios(struct tty_struct *tty,
 457                                  struct usb_serial_port *port,
 458                                  struct ktermios *old_termios)
 459 {
 460         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 461         unsigned int iflag = tty->termios->c_iflag;
 462         unsigned int old_iflag = old_termios->c_iflag;
 463         unsigned int cflag = tty->termios->c_cflag;
 464         unsigned int old_cflag = old_termios->c_cflag;
 465         struct klsi_105_port_settings *cfg;
 466         unsigned long flags;
 467         speed_t baud;
 468
 469         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 470         if (!cfg) {
 471                 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
 472                                 __func__);
 473                 return;
 474         }
 475
 476         /* lock while we are modifying the settings */
 477         spin_lock_irqsave(&priv->lock, flags);
 478
 479         /*
 480          * Update baud rate
 481          */
 482         baud = tty_get_baud_rate(tty);
 483
 484         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 485                 /* reassert DTR and (maybe) RTS on transition from B0 */
 486                 if ((old_cflag & CBAUD) == B0) {
 487                         dbg("%s: baud was B0", __func__);
 488 #if 0
 489                         priv->control_state |= TIOCM_DTR;
 490                         /* don't set RTS if using hardware flow control */
 491                         if (!(old_cflag & CRTSCTS))
 492                                 priv->control_state |= TIOCM_RTS;
 493                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 494 #endif
 495                 }
 496         }
 497         switch (baud) {
 498         case 0: /* handled below */
 499                 break;
 500         case 1200:
 501                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 502                 break;
 503         case 2400:
 504                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 505                 break;
 506         case 4800:
 507                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 508                 break;
 509         case 9600:
 510                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 511                 break;
 512         case 19200:
 513                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 514                 break;
 515         case 38400:
 516                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 517                 break;
 518         case 57600:
 519                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 520                 break;
 521         case 115200:
 522                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 523                 break;
 524         default:
 525                 dbg("KLSI USB->Serial converter:"
 526                     " unsupported baudrate request, using default of 9600");
 527                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 528                 baud = 9600;
 529                 break;
 530         }
 531         if ((cflag & CBAUD) == B0) {
 532                 dbg("%s: baud is B0", __func__);
 533                 /* Drop RTS and DTR */
 534                 /* maybe this should be simulated by sending read
 535                  * disable and read enable messages?
 536                  */
 537                 ;
 538 #if 0
 539                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 540                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 541 #endif
 542         }
 543         tty_encode_baud_rate(tty, baud, baud);
 544
 545         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 546                 /* set the number of data bits */
 547                 switch (cflag & CSIZE) {
 548                 case CS5:
 549                         dbg("%s - 5 bits/byte not supported", __func__);
 550                         spin_unlock_irqrestore(&priv->lock, flags);
 551                         goto err;
 552                 case CS6:
 553                         dbg("%s - 6 bits/byte not supported", __func__);
 554                         spin_unlock_irqrestore(&priv->lock, flags);
 555                         goto err;
 556                 case CS7:
 557                         priv->cfg.databits = kl5kusb105a_dtb_7;
 558                         break;
 559                 case CS8:
 560                         priv->cfg.databits = kl5kusb105a_dtb_8;
 561                         break;
 562                 default:
 563                         dev_err(&port->dev,
 564                                 "CSIZE was not CS5-CS8, using default of 8\n");
 565                         priv->cfg.databits = kl5kusb105a_dtb_8;
 566                         break;
 567                 }
 568         }
 569
 570         /*
 571          * Update line control register (LCR)
 572          */
 573         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 574             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 575                 /* Not currently supported */
 576                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 577 #if 0
 578                 priv->last_lcr = 0;
 579
 580                 /* set the parity */
 581                 if (cflag & PARENB)
 582                         priv->last_lcr |= (cflag & PARODD) ?
 583                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 584                 else
 585                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 586
 587                 /* set the number of stop bits */
 588                 priv->last_lcr |= (cflag & CSTOPB) ?
 589                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 590
 591                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 592 #endif
 593                 ;
 594         }
 595         /*
 596          * Set flow control: well, I do not really now how to handle DTR/RTS.
 597          * Just do what we have seen with SniffUSB on Win98.
 598          */
 599         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 600             || (iflag & IXON) != (old_iflag & IXON)
 601             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 602                 /* Not currently supported */
 603                 tty->termios->c_cflag &= ~CRTSCTS;
 604                 /* Drop DTR/RTS if no flow control otherwise assert */
 605 #if 0
 606                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 607                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 608                 else
 609                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 610                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 611 #endif
 612                 ;
 613         }
 614         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 615         spin_unlock_irqrestore(&priv->lock, flags);
 616
 617         /* now commit changes to device */
 618         klsi_105_chg_port_settings(port, cfg);
 619 err:
 620         kfree(cfg);
 621 }
 622
 623 #if 0
 624 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 625 {
 626         struct usb_serial_port *port = tty->driver_data;
 627         struct usb_serial *serial = port->serial;
 628         struct mct_u232_private *priv =
 629                                 (struct mct_u232_private *)port->private;
 630         unsigned char lcr = priv->last_lcr;
 631
 632         dbg("%sstate=%d", __func__, break_state);
 633
 634         /* LOCKING */
 635         if (break_state)
 636                 lcr |= MCT_U232_SET_BREAK;
 637
 638         mct_u232_set_line_ctrl(serial, lcr);
 639 }
 640 #endif
 641
 642 static int klsi_105_tiocmget(struct tty_struct *tty)
 643 {
 644         struct usb_serial_port *port = tty->driver_data;
 645         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 646         unsigned long flags;
 647         int rc;
 648         unsigned long line_state;
 649         dbg("%s - request, just guessing", __func__);
 650
 651         rc = klsi_105_get_line_state(port, &line_state);
 652         if (rc < 0) {
 653                 dev_err(&port->dev,
 654                         "Reading line control failed (error = %d)\n", rc);
 655                 /* better return value? EAGAIN? */
 656                 return rc;
 657         }
 658
 659         spin_lock_irqsave(&priv->lock, flags);
 660         priv->line_state = line_state;
 661         spin_unlock_irqrestore(&priv->lock, flags);
 662         dbg("%s - read line state 0x%lx", __func__, line_state);
 663         return (int)line_state;
 664 }
 665
 666 static int klsi_105_tiocmset(struct tty_struct *tty,
 667                              unsigned int set, unsigned int clear)
 668 {
 669         int retval = -EINVAL;
 670
 671         dbg("%s", __func__);
 672
 673 /* if this ever gets implemented, it should be done something like this:
 674         struct usb_serial *serial = port->serial;
 675         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 676         unsigned long flags;
 677         int control;
 678
 679         spin_lock_irqsave (&priv->lock, flags);
 680         if (set & TIOCM_RTS)
 681                 priv->control_state |= TIOCM_RTS;
 682         if (set & TIOCM_DTR)
 683                 priv->control_state |= TIOCM_DTR;
 684         if (clear & TIOCM_RTS)
 685                 priv->control_state &= ~TIOCM_RTS;
 686         if (clear & TIOCM_DTR)
 687                 priv->control_state &= ~TIOCM_DTR;
 688         control = priv->control_state;
 689         spin_unlock_irqrestore (&priv->lock, flags);
 690         retval = mct_u232_set_modem_ctrl(serial, control);
 691 */
 692         return retval;
 693 }
 694
 695 module_usb_serial_driver(kl5kusb105d_driver, serial_drivers);
 696
 697 MODULE_AUTHOR(DRIVER_AUTHOR);
 698 MODULE_DESCRIPTION(DRIVER_DESC);
 699 MODULE_LICENSE("GPL");
 700
 701 module_param(debug, bool, S_IRUGO | S_IWUSR);
 702 MODULE_PARM_DESC(debug, "enable extensive debugging messages");