drivers/usb/serial/belkin_sa.c

   1 /*
   2  * Belkin USB Serial Adapter Driver
   3  *
   4  *  Copyright (C) 2000          William Greathouse (wgreathouse@smva.com)
   5  *  Copyright (C) 2000-2001     Greg Kroah-Hartman (greg@kroah.com)
   6  *
   7  *  This program is largely derived from work by the linux-usb group
   8  *  and associated source files.  Please see the usb/serial files for
   9  *  individual credits and copyrights.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  * See Documentation/usb/usb-serial.txt for more information on using this driver
  17  *
  18  * TODO:
  19  * -- Add true modem contol line query capability.  Currently we track the
  20  *    states reported by the interrupt and the states we request.
  21  * -- Add error reporting back to application for UART error conditions.
  22  *    Just point me at how to implement this and I'll do it. I've put the
  23  *    framework in, but haven't analyzed the "tty_flip" interface yet.
  24  * -- Add support for flush commands
  25  * -- Add everything that is missing :)
  26  *
  27  * 27-Nov-2001 gkh
  28  *      compressed all the differnent device entries into 1.
  29  *
  30  * 30-May-2001 gkh
  31  *      switched from using spinlock to a semaphore, which fixes lots of problems.
  32  *
  33  * 08-Apr-2001 gb
  34  *      - Identify version on module load.
  35  *
  36  * 12-Mar-2001 gkh
  37  *      - Added support for the GoHubs GO-COM232 device which is the same as the
  38  *        Peracom device.
  39  *
  40  * 06-Nov-2000 gkh
  41  *      - Added support for the old Belkin and Peracom devices.
  42  *      - Made the port able to be opened multiple times.
  43  *      - Added some defaults incase the line settings are things these devices
  44  *        can't support.
  45  *
  46  * 18-Oct-2000 William Greathouse
  47  *    Released into the wild (linux-usb-devel)
  48  *
  49  * 17-Oct-2000 William Greathouse
  50  *    Add code to recognize firmware version and set hardware flow control
  51  *    appropriately.  Belkin states that firmware prior to 3.05 does not
  52  *    operate correctly in hardware handshake mode.  I have verified this
  53  *    on firmware 2.05 -- for both RTS and DTR input flow control, the control
  54  *    line is not reset.  The test performed by the Belkin Win* driver is
  55  *    to enable hardware flow control for firmware 2.06 or greater and
  56  *    for 1.00 or prior.  I am only enabling for 2.06 or greater.
  57  *
  58  * 12-Oct-2000 William Greathouse
  59  *    First cut at supporting Belkin USB Serial Adapter F5U103
  60  *    I did not have a copy of the original work to support this
  61  *    adapter, so pardon any stupid mistakes.  All of the information
  62  *    I am using to write this driver was acquired by using a modified
  63  *    UsbSnoop on Windows2000 and from examining the other USB drivers.
  64  */
  65
  66 #include <linux/config.h>
  67 #include <linux/kernel.h>
  68 #include <linux/errno.h>
  69 #include <linux/init.h>
  70 #include <linux/slab.h>
  71 #include <linux/tty.h>
  72 #include <linux/tty_driver.h>
  73 #include <linux/tty_flip.h>
  74 #include <linux/module.h>
  75 #include <linux/spinlock.h>
  76 #include <asm/uaccess.h>
  77 #include <linux/usb.h>
  78 #include "usb-serial.h"
  79 #include "belkin_sa.h"
  80
  81 static int debug;
  82
  83 /*
  84  * Version Information
  85  */
  86 #define DRIVER_VERSION "v1.2"
  87 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
  88 #define DRIVER_DESC "USB Belkin Serial converter driver"
  89
  90 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
  91 static int  belkin_sa_startup           (struct usb_serial *serial);
  92 static void belkin_sa_shutdown          (struct usb_serial *serial);
  93 static int  belkin_sa_open              (struct usb_serial_port *port, struct file *filp);
  94 static void belkin_sa_close             (struct usb_serial_port *port, struct file *filp);
  95 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs);
  96 static void belkin_sa_set_termios       (struct usb_serial_port *port, struct termios * old);
  97 static int  belkin_sa_ioctl             (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
  98 static void belkin_sa_break_ctl         (struct usb_serial_port *port, int break_state );
  99 static int  belkin_sa_tiocmget          (struct usb_serial_port *port, struct file *file);
 100 static int  belkin_sa_tiocmset          (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
 101
 102
 103 static struct usb_device_id id_table_combined [] = {
 104         { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
 105         { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
 106         { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
 107         { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
 108         { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
 109         { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
 110         { }                                                     /* Terminating entry */
 111 };
 112
 113 MODULE_DEVICE_TABLE (usb, id_table_combined);
 114
 115 static struct usb_driver belkin_driver = {
 116         .owner =        THIS_MODULE,
 117         .name =         "belkin",
 118         .probe =        usb_serial_probe,
 119         .disconnect =   usb_serial_disconnect,
 120         .id_table =     id_table_combined,
 121 };
 122
 123 /* All of the device info needed for the serial converters */
 124 static struct usb_serial_device_type belkin_device = {
 125         .owner =                THIS_MODULE,
 126         .name =                 "Belkin / Peracom / GoHubs USB Serial Adapter",
 127         .short_name =           "belkin",
 128         .id_table =             id_table_combined,
 129         .num_interrupt_in =     1,
 130         .num_bulk_in =          1,
 131         .num_bulk_out =         1,
 132         .num_ports =            1,
 133         .open =                 belkin_sa_open,
 134         .close =                belkin_sa_close,
 135         .read_int_callback =    belkin_sa_read_int_callback,    /* How we get the status info */
 136         .ioctl =                belkin_sa_ioctl,
 137         .set_termios =          belkin_sa_set_termios,
 138         .break_ctl =            belkin_sa_break_ctl,
 139         .tiocmget =             belkin_sa_tiocmget,
 140         .tiocmset =             belkin_sa_tiocmset,
 141         .attach =               belkin_sa_startup,
 142         .shutdown =             belkin_sa_shutdown,
 143 };
 144
 145
 146 struct belkin_sa_private {
 147         spinlock_t              lock;
 148         unsigned long           control_state;
 149         unsigned char           last_lsr;
 150         unsigned char           last_msr;
 151         int                     bad_flow_control;
 152 };
 153
 154
 155 /*
 156  * ***************************************************************************
 157  * Belkin USB Serial Adapter F5U103 specific driver functions
 158  * ***************************************************************************
 159  */
 160
 161 #define WDR_TIMEOUT 5000 /* default urb timeout */
 162
 163 /* assumes that struct usb_serial *serial is available */
 164 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
 165                                             (c), BELKIN_SA_SET_REQUEST_TYPE, \
 166                                             (v), 0, NULL, 0, WDR_TIMEOUT)
 167
 168 /* do some startup allocations not currently performed by usb_serial_probe() */
 169 static int belkin_sa_startup (struct usb_serial *serial)
 170 {
 171         struct usb_device *dev = serial->dev;
 172         struct belkin_sa_private *priv;
 173
 174         /* allocate the private data structure */
 175         priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
 176         if (!priv)
 177                 return (-1); /* error */
 178         /* set initial values for control structures */
 179         spin_lock_init(&priv->lock);
 180         priv->control_state = 0;
 181         priv->last_lsr = 0;
 182         priv->last_msr = 0;
 183         /* see comments at top of file */
 184         priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
 185         info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
 186
 187         init_waitqueue_head(&serial->port[0]->write_wait);
 188         usb_set_serial_port_data(serial->port[0], priv);
 189
 190         return (0);
 191 }
 192
 193
 194 static void belkin_sa_shutdown (struct usb_serial *serial)
 195 {
 196         struct belkin_sa_private *priv;
 197         int i;
 198
 199         dbg ("%s", __FUNCTION__);
 200
 201         /* stop reads and writes on all ports */
 202         for (i=0; i < serial->num_ports; ++i) {
 203                 /* My special items, the standard routines free my urbs */
 204                 priv = usb_get_serial_port_data(serial->port[i]);
 205                 kfree(priv);
 206         }
 207 }
 208
 209
 210 static int  belkin_sa_open (struct usb_serial_port *port, struct file *filp)
 211 {
 212         int retval = 0;
 213
 214         dbg("%s port %d", __FUNCTION__, port->number);
 215
 216         /*Start reading from the device*/
 217         /* TODO: Look at possibility of submitting multiple URBs to device to
 218          *       enhance buffering.  Win trace shows 16 initial read URBs.
 219          */
 220         port->read_urb->dev = port->serial->dev;
 221         retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
 222         if (retval) {
 223                 err("usb_submit_urb(read bulk) failed");
 224                 goto exit;
 225         }
 226
 227         port->interrupt_in_urb->dev = port->serial->dev;
 228         retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 229         if (retval) {
 230                 usb_kill_urb(port->read_urb);
 231                 err(" usb_submit_urb(read int) failed");
 232         }
 233
 234 exit:
 235         return retval;
 236 } /* belkin_sa_open */
 237
 238
 239 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
 240 {
 241         dbg("%s port %d", __FUNCTION__, port->number);
 242
 243         /* shutdown our bulk reads and writes */
 244         usb_kill_urb(port->write_urb);
 245         usb_kill_urb(port->read_urb);
 246         usb_kill_urb(port->interrupt_in_urb);
 247 } /* belkin_sa_close */
 248
 249
 250 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
 251 {
 252         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 253         struct belkin_sa_private *priv;
 254         unsigned char *data = urb->transfer_buffer;
 255         int retval;
 256         unsigned long flags;
 257
 258         switch (urb->status) {
 259         case 0:
 260                 /* success */
 261                 break;
 262         case -ECONNRESET:
 263         case -ENOENT:
 264         case -ESHUTDOWN:
 265                 /* this urb is terminated, clean up */
 266                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 267                 return;
 268         default:
 269                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 270                 goto exit;
 271         }
 272
 273         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 274
 275         /* Handle known interrupt data */
 276         /* ignore data[0] and data[1] */
 277
 278         priv = usb_get_serial_port_data(port);
 279         spin_lock_irqsave(&priv->lock, flags);
 280         priv->last_msr = data[BELKIN_SA_MSR_INDEX];
 281
 282         /* Record Control Line states */
 283         if (priv->last_msr & BELKIN_SA_MSR_DSR)
 284                 priv->control_state |= TIOCM_DSR;
 285         else
 286                 priv->control_state &= ~TIOCM_DSR;
 287
 288         if (priv->last_msr & BELKIN_SA_MSR_CTS)
 289                 priv->control_state |= TIOCM_CTS;
 290         else
 291                 priv->control_state &= ~TIOCM_CTS;
 292
 293         if (priv->last_msr & BELKIN_SA_MSR_RI)
 294                 priv->control_state |= TIOCM_RI;
 295         else
 296                 priv->control_state &= ~TIOCM_RI;
 297
 298         if (priv->last_msr & BELKIN_SA_MSR_CD)
 299                 priv->control_state |= TIOCM_CD;
 300         else
 301                 priv->control_state &= ~TIOCM_CD;
 302
 303         /* Now to report any errors */
 304         priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
 305 #if 0
 306         /*
 307          * fill in the flip buffer here, but I do not know the relation
 308          * to the current/next receive buffer or characters.  I need
 309          * to look in to this before committing any code.
 310          */
 311         if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
 312                 tty = port->tty;
 313                 /* Overrun Error */
 314                 if (priv->last_lsr & BELKIN_SA_LSR_OE) {
 315                 }
 316                 /* Parity Error */
 317                 if (priv->last_lsr & BELKIN_SA_LSR_PE) {
 318                 }
 319                 /* Framing Error */
 320                 if (priv->last_lsr & BELKIN_SA_LSR_FE) {
 321                 }
 322                 /* Break Indicator */
 323                 if (priv->last_lsr & BELKIN_SA_LSR_BI) {
 324                 }
 325         }
 326 #endif
 327         spin_unlock_irqrestore(&priv->lock, flags);
 328 exit:
 329         retval = usb_submit_urb (urb, GFP_ATOMIC);
 330         if (retval)
 331                 err ("%s - usb_submit_urb failed with result %d",
 332                      __FUNCTION__, retval);
 333 }
 334
 335 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 336 {
 337         struct usb_serial *serial = port->serial;
 338         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 339         unsigned int iflag;
 340         unsigned int cflag;
 341         unsigned int old_iflag = 0;
 342         unsigned int old_cflag = 0;
 343         __u16 urb_value = 0; /* Will hold the new flags */
 344         unsigned long flags;
 345         unsigned long control_state;
 346         int bad_flow_control;
 347
 348         if ((!port->tty) || (!port->tty->termios)) {
 349                 dbg ("%s - no tty or termios structure", __FUNCTION__);
 350                 return;
 351         }
 352
 353         iflag = port->tty->termios->c_iflag;
 354         cflag = port->tty->termios->c_cflag;
 355
 356         /* get a local copy of the current port settings */
 357         spin_lock_irqsave(&priv->lock, flags);
 358         control_state = priv->control_state;
 359         bad_flow_control = priv->bad_flow_control;
 360         spin_unlock_irqrestore(&priv->lock, flags);
 361
 362         /* check that they really want us to change something */
 363         if (old_termios) {
 364                 if ((cflag == old_termios->c_cflag) &&
 365                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 366                         dbg("%s - nothing to change...", __FUNCTION__);
 367                         return;
 368                 }
 369                 old_iflag = old_termios->c_iflag;
 370                 old_cflag = old_termios->c_cflag;
 371         }
 372
 373         /* Set the baud rate */
 374         if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
 375                 /* reassert DTR and (maybe) RTS on transition from B0 */
 376                 if( (old_cflag&CBAUD) == B0 ) {
 377                         control_state |= (TIOCM_DTR|TIOCM_RTS);
 378                         if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
 379                                 err("Set DTR error");
 380                         /* don't set RTS if using hardware flow control */
 381                         if (!(old_cflag&CRTSCTS) )
 382                                 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
 383                                         err("Set RTS error");
 384                 }
 385
 386                 switch(cflag & CBAUD) {
 387                         case B0: /* handled below */ break;
 388                         case B300: urb_value = BELKIN_SA_BAUD(300); break;
 389                         case B600: urb_value = BELKIN_SA_BAUD(600); break;
 390                         case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
 391                         case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
 392                         case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
 393                         case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
 394                         case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
 395                         case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
 396                         case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
 397                         case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
 398                         case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
 399                         default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
 400                                 urb_value = BELKIN_SA_BAUD(9600); break;
 401                 }
 402                 if ((cflag & CBAUD) != B0 ) {
 403                         if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
 404                                 err("Set baudrate error");
 405                 } else {
 406                         /* Disable flow control */
 407                         if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
 408                                 err("Disable flowcontrol error");
 409
 410                         /* Drop RTS and DTR */
 411                         control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 412                         if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
 413                                 err("DTR LOW error");
 414                         if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
 415                                 err("RTS LOW error");
 416                 }
 417         }
 418
 419         /* set the parity */
 420         if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
 421                 if (cflag & PARENB)
 422                         urb_value = (cflag & PARODD) ?  BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
 423                 else
 424                         urb_value = BELKIN_SA_PARITY_NONE;
 425                 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
 426                         err("Set parity error");
 427         }
 428
 429         /* set the number of data bits */
 430         if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
 431                 switch (cflag & CSIZE) {
 432                         case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
 433                         case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
 434                         case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
 435                         case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
 436                         default: err("CSIZE was not CS5-CS8, using default of 8");
 437                                 urb_value = BELKIN_SA_DATA_BITS(8);
 438                                 break;
 439                 }
 440                 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
 441                         err("Set data bits error");
 442         }
 443
 444         /* set the number of stop bits */
 445         if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
 446                 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
 447                 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
 448                         err("Set stop bits error");
 449         }
 450
 451         /* Set flow control */
 452         if( (iflag&IXOFF)   != (old_iflag&IXOFF)
 453         ||      (iflag&IXON)    != (old_iflag&IXON)
 454         ||  (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
 455                 urb_value = 0;
 456                 if ((iflag & IXOFF) || (iflag & IXON))
 457                         urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 458                 else
 459                         urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 460
 461                 if (cflag & CRTSCTS)
 462                         urb_value |=  (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 463                 else
 464                         urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 465
 466                 if (bad_flow_control)
 467                         urb_value &= ~(BELKIN_SA_FLOW_IRTS);
 468
 469                 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
 470                         err("Set flow control error");
 471         }
 472
 473         /* save off the modified port settings */
 474         spin_lock_irqsave(&priv->lock, flags);
 475         priv->control_state = control_state;
 476         spin_unlock_irqrestore(&priv->lock, flags);
 477 } /* belkin_sa_set_termios */
 478
 479
 480 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
 481 {
 482         struct usb_serial *serial = port->serial;
 483
 484         if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
 485                 err("Set break_ctl %d", break_state);
 486 }
 487
 488
 489 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
 490 {
 491         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 492         unsigned long control_state;
 493         unsigned long flags;
 494
 495         dbg("%s", __FUNCTION__);
 496
 497         spin_lock_irqsave(&priv->lock, flags);
 498         control_state = priv->control_state;
 499         spin_unlock_irqrestore(&priv->lock, flags);
 500
 501         return control_state;
 502 }
 503
 504
 505 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
 506                                unsigned int set, unsigned int clear)
 507 {
 508         struct usb_serial *serial = port->serial;
 509         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 510         unsigned long control_state;
 511         unsigned long flags;
 512         int retval;
 513         int rts = 0;
 514         int dtr = 0;
 515
 516         dbg("%s", __FUNCTION__);
 517
 518         spin_lock_irqsave(&priv->lock, flags);
 519         control_state = priv->control_state;
 520
 521         if (set & TIOCM_RTS) {
 522                 control_state |= TIOCM_RTS;
 523                 rts = 1;
 524         }
 525         if (set & TIOCM_DTR) {
 526                 control_state |= TIOCM_DTR;
 527                 dtr = 1;
 528         }
 529         if (clear & TIOCM_RTS) {
 530                 control_state &= ~TIOCM_RTS;
 531                 rts = 0;
 532         }
 533         if (clear & TIOCM_DTR) {
 534                 control_state &= ~TIOCM_DTR;
 535                 dtr = 0;
 536         }
 537
 538         priv->control_state = control_state;
 539         spin_unlock_irqrestore(&priv->lock, flags);
 540
 541         retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
 542         if (retval < 0) {
 543                 err("Set RTS error %d", retval);
 544                 goto exit;
 545         }
 546
 547         retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
 548         if (retval < 0) {
 549                 err("Set DTR error %d", retval);
 550                 goto exit;
 551         }
 552 exit:
 553         return retval;
 554 }
 555
 556
 557 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
 558 {
 559         switch (cmd) {
 560         case TIOCMIWAIT:
 561                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
 562                 /* TODO */
 563                 return( 0 );
 564
 565         case TIOCGICOUNT:
 566                 /* return count of modemline transitions */
 567                 /* TODO */
 568                 return 0;
 569
 570         default:
 571                 dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
 572                 return(-ENOIOCTLCMD);
 573                 break;
 574         }
 575         return 0;
 576 } /* belkin_sa_ioctl */
 577
 578
 579 static int __init belkin_sa_init (void)
 580 {
 581         int retval;
 582         retval = usb_serial_register(&belkin_device);
 583         if (retval)
 584                 goto failed_usb_serial_register;
 585         retval = usb_register(&belkin_driver);
 586         if (retval)
 587                 goto failed_usb_register;
 588         info(DRIVER_DESC " " DRIVER_VERSION);
 589         return 0;
 590 failed_usb_register:
 591         usb_serial_deregister(&belkin_device);
 592 failed_usb_serial_register:
 593         return retval;
 594 }
 595
 596
 597 static void __exit belkin_sa_exit (void)
 598 {
 599         usb_deregister (&belkin_driver);
 600         usb_serial_deregister (&belkin_device);
 601 }
 602
 603
 604 module_init (belkin_sa_init);
 605 module_exit (belkin_sa_exit);
 606
 607 MODULE_AUTHOR( DRIVER_AUTHOR );
 608 MODULE_DESCRIPTION( DRIVER_DESC );
 609 MODULE_VERSION( DRIVER_VERSION );
 610 MODULE_LICENSE("GPL");
 611
 612 module_param(debug, bool, S_IRUGO | S_IWUSR);
 613 MODULE_PARM_DESC(debug, "Debug enabled or not");