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