drivers/usb/uss720.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      uss720.c  --  USS720 USB Parport Cable.
   5  *
   6  *      Copyright (C) 1999
   7  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *  Based on parport_pc.c
  24  *
  25  *  History:
  26  *   0.1  04.08.99  Created
  27  *   0.2  07.08.99  Some fixes mainly suggested by Tim Waugh
  28  *                  Interrupt handling currently disabled because
  29  *                  usb_request_irq crashes somewhere within ohci.c
  30  *                  for no apparent reason (that is for me, anyway)
  31  *                  ECP currently untested
  32  *   0.3  10.08.99  fixing merge errors
  33  *   0.4  13.08.99  Added Vendor/Product ID of Brad Hard's cable
  34  *   0.5  20.09.99  usb_control_msg wrapper used
  35  *        Nov01.00  usb_device_table support by Adam J. Richter
  36  *
  37  */
  38
  39 /*****************************************************************************/
  40
  41 #include <linux/module.h>
  42 #include <linux/socket.h>
  43 #include <linux/parport.h>
  44 #include <linux/init.h>
  45 #include <linux/usb.h>
  46
  47 /* --------------------------------------------------------------------- */
  48
  49 struct parport_uss720_private {
  50         struct usb_device *usbdev;
  51         void *irqhandle;
  52         unsigned int irqpipe;
  53         unsigned char reg[7];  /* USB registers */
  54 };
  55
  56 /* --------------------------------------------------------------------- */
  57
  58 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val)
  59 {
  60         struct parport_uss720_private *priv = pp->private_data;
  61         struct usb_device *usbdev = priv->usbdev;
  62         static const unsigned char regindex[9] = {
  63                 4, 0, 1, 5, 5, 0, 2, 3, 6
  64         };
  65         int ret;
  66
  67         if (!usbdev)
  68                 return -1;
  69         ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev,0), 3, 0xc0, ((unsigned int)reg) << 8, 0, priv->reg, 7, HZ);
  70         if (ret) {
  71                 printk(KERN_DEBUG "uss720: get_1284_register(%d) failed, status 0x%x\n",
  72                        (unsigned int)reg, ret);
  73         } else {
  74 #if 0
  75                 printk(KERN_DEBUG "uss720: get_1284_register(%d) return %02x %02x %02x %02x %02x %02x %02x\n",
  76                        (unsigned int)reg, (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
  77                        (unsigned int)priv->reg[2], (unsigned int)priv->reg[3], (unsigned int)priv->reg[4],
  78                        (unsigned int)priv->reg[5], (unsigned int)priv->reg[6]);
  79 #endif
  80                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
  81                 if (priv->reg[2] & priv->reg[1] & 0x10)
  82                         parport_generic_irq(0, pp, NULL);
  83         }
  84         if (val)
  85                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
  86         return ret;
  87 }
  88
  89 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val)
  90 {
  91         struct parport_uss720_private *priv = pp->private_data;
  92         struct usb_device *usbdev = priv->usbdev;
  93         int ret;
  94
  95         if (!usbdev)
  96                 return -1;
  97         ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev,0), 4, 0x40, (((unsigned int)reg) << 8) | val, 0, NULL, 0, HZ);
  98         if (ret) {
  99                 printk(KERN_DEBUG "uss720: set_1284_register(%u,0x%02x) failed, status 0x%x\n",
 100                        (unsigned int)reg, (unsigned int)val, ret);
 101         } else {
 102 #if 0
 103                 printk(KERN_DEBUG "uss720: set_1284_register(%u,0x%02x)\n",
 104                        (unsigned int)reg, (unsigned int)val);
 105 #endif
 106         }
 107         return ret;
 108 }
 109
 110 /* --------------------------------------------------------------------- */
 111
 112 /* ECR modes */
 113 #define ECR_SPP 00
 114 #define ECR_PS2 01
 115 #define ECR_PPF 02
 116 #define ECR_ECP 03
 117 #define ECR_EPP 04
 118
 119 /* Safely change the mode bits in the ECR */
 120 static int change_mode(struct parport *pp, int m)
 121 {
 122         struct parport_uss720_private *priv = pp->private_data;
 123         int mode;
 124
 125         if (get_1284_register(pp, 6, NULL))
 126                 return -EIO;
 127         /* Bits <7:5> contain the mode. */
 128         mode = (priv->reg[2] >> 5) & 0x7;
 129         if (mode == m)
 130                 return 0;
 131         /* We have to go through mode 000 or 001 */
 132         if (mode > ECR_PS2 && m > ECR_PS2)
 133                 if (change_mode(pp, ECR_PS2))
 134                         return -EIO;
 135
 136         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 137                 /* This mode resets the FIFO, so we may
 138                  * have to wait for it to drain first. */
 139                 long expire = jiffies + pp->physport->cad->timeout;
 140                 switch (mode) {
 141                 case ECR_PPF: /* Parallel Port FIFO mode */
 142                 case ECR_ECP: /* ECP Parallel Port mode */
 143                         /* Poll slowly. */
 144                         for (;;) {
 145                                 if (get_1284_register(pp, 6, NULL))
 146                                         return -EIO;
 147                                 if (priv->reg[2] & 0x01)
 148                                         break;
 149                                 if (time_after_eq (jiffies, expire))
 150                                         /* The FIFO is stuck. */
 151                                         return -EBUSY;
 152                                 current->state = TASK_INTERRUPTIBLE;
 153                                 schedule_timeout((HZ + 99) / 100);
 154                                 if (signal_pending (current))
 155                                         break;
 156                         }
 157                 }
 158         }
 159         /* Set the mode. */
 160         if (set_1284_register(pp, 6, m << 5))
 161                 return -EIO;
 162         return 0;
 163 }
 164
 165 /*
 166  * Clear TIMEOUT BIT in EPP MODE
 167  */
 168 static int clear_epp_timeout(struct parport *pp)
 169 {
 170         unsigned char stat;
 171
 172         if (get_1284_register(pp, 1, &stat))
 173                 return 1;
 174         return stat & 1;
 175 }
 176
 177 /*
 178  * Access functions.
 179  */
 180 #if 0
 181 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 182 {
 183         struct parport *pp = (struct parport *)dev_id;
 184         struct parport_uss720_private *priv = pp->private_data;
 185
 186         if (usbstatus != USB_ST_NOERROR || len < 4 || !buffer)
 187                 return 1;
 188         memcpy(priv->reg, buffer, 4);
 189         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 190         if (priv->reg[2] & priv->reg[1] & 0x10)
 191                 parport_generic_irq(0, pp, NULL);
 192         return 1;
 193 }
 194 #endif
 195
 196 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 197 {
 198         set_1284_register(pp, 0, d);
 199 }
 200
 201 static unsigned char parport_uss720_read_data(struct parport *pp)
 202 {
 203         unsigned char ret;
 204
 205         if (get_1284_register(pp, 0, &ret))
 206                 return 0;
 207         return ret;
 208 }
 209
 210 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 211 {
 212         struct parport_uss720_private *priv = pp->private_data;
 213
 214         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 215         if (set_1284_register(pp, 2, d))
 216                 return;
 217         priv->reg[1] = d;
 218 }
 219
 220 static unsigned char parport_uss720_read_control(struct parport *pp)
 221 {
 222         struct parport_uss720_private *priv = pp->private_data;
 223         return priv->reg[1] & 0xf; /* Use soft copy */
 224 }
 225
 226 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 227 {
 228         struct parport_uss720_private *priv = pp->private_data;
 229         unsigned char d;
 230
 231         mask &= 0x0f;
 232         val &= 0x0f;
 233         d = (priv->reg[1] & (~mask)) ^ val;
 234         if (set_1284_register(pp, 2, d))
 235                 return 0;
 236         priv->reg[1] = d;
 237         return d & 0xf;
 238 }
 239
 240 static unsigned char parport_uss720_read_status(struct parport *pp)
 241 {
 242         unsigned char ret;
 243
 244         if (get_1284_register(pp, 1, &ret))
 245                 return 0;
 246         return ret & 0xf8;
 247 }
 248
 249 static void parport_uss720_disable_irq(struct parport *pp)
 250 {
 251         struct parport_uss720_private *priv = pp->private_data;
 252         unsigned char d;
 253
 254         d = priv->reg[1] & ~0x10;
 255         if (set_1284_register(pp, 2, d))
 256                 return;
 257         priv->reg[1] = d;
 258 }
 259
 260 static void parport_uss720_enable_irq(struct parport *pp)
 261 {
 262         struct parport_uss720_private *priv = pp->private_data;
 263         unsigned char d;
 264
 265         d = priv->reg[1] | 0x10;
 266         if (set_1284_register(pp, 2, d))
 267                 return;
 268         priv->reg[1] = d;
 269 }
 270
 271 static void parport_uss720_data_forward (struct parport *pp)
 272 {
 273         struct parport_uss720_private *priv = pp->private_data;
 274         unsigned char d;
 275
 276         d = priv->reg[1] & ~0x20;
 277         if (set_1284_register(pp, 2, d))
 278                 return;
 279         priv->reg[1] = d;
 280 }
 281
 282 static void parport_uss720_data_reverse (struct parport *pp)
 283 {
 284         struct parport_uss720_private *priv = pp->private_data;
 285         unsigned char d;
 286
 287         d = priv->reg[1] | 0x20;
 288         if (set_1284_register(pp, 2, d))
 289                 return;
 290         priv->reg[1] = d;
 291 }
 292
 293 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 294 {
 295         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 296         s->u.pc.ecr = 0x24;
 297 }
 298
 299 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 300 {
 301         struct parport_uss720_private *priv = pp->private_data;
 302
 303         if (get_1284_register(pp, 2, NULL))
 304                 return;
 305         s->u.pc.ctr = priv->reg[1];
 306         s->u.pc.ecr = priv->reg[2];
 307 }
 308
 309 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 310 {
 311         set_1284_register(pp, 2, s->u.pc.ctr);
 312         set_1284_register(pp, 6, s->u.pc.ecr);
 313         get_1284_register(pp, 2, NULL);
 314 }
 315
 316 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 317 {
 318         struct parport_uss720_private *priv = pp->private_data;
 319         size_t got = 0;
 320
 321         if (change_mode(pp, ECR_EPP))
 322                 return 0;
 323         for (; got < length; got++) {
 324                 if (get_1284_register(pp, 4, (char *)buf))
 325                         break;
 326                 ((char*)buf)++;
 327                 if (priv->reg[0] & 0x01) {
 328                         clear_epp_timeout(pp);
 329                         break;
 330                 }
 331         }
 332         change_mode(pp, ECR_PS2);
 333         return got;
 334 }
 335
 336 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 337 {
 338 #if 0
 339         struct parport_uss720_private *priv = pp->private_data;
 340         size_t written = 0;
 341
 342         if (change_mode(pp, ECR_EPP))
 343                 return 0;
 344         for (; written < length; written++) {
 345                 if (set_1284_register(pp, 4, (char *)buf))
 346                         break;
 347                 ((char*)buf)++;
 348                 if (get_1284_register(pp, 1, NULL))
 349                         break;
 350                 if (priv->reg[0] & 0x01) {
 351                         clear_epp_timeout(pp);
 352                         break;
 353                 }
 354         }
 355         change_mode(pp, ECR_PS2);
 356         return written;
 357 #else
 358         struct parport_uss720_private *priv = pp->private_data;
 359         struct usb_device *usbdev = priv->usbdev;
 360         int rlen;
 361         int i;
 362
 363         if (!usbdev)
 364                 return 0;
 365         if (change_mode(pp, ECR_EPP))
 366                 return 0;
 367         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, HZ*20);
 368         if (i)
 369                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u rlen %u\n", buf, length, rlen);
 370         change_mode(pp, ECR_PS2);
 371         return rlen;
 372 #endif
 373 }
 374
 375 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 376 {
 377         struct parport_uss720_private *priv = pp->private_data;
 378         size_t got = 0;
 379
 380         if (change_mode(pp, ECR_EPP))
 381                 return 0;
 382         for (; got < length; got++) {
 383                 if (get_1284_register(pp, 3, (char *)buf))
 384                         break;
 385                 ((char*)buf)++;
 386                 if (priv->reg[0] & 0x01) {
 387                         clear_epp_timeout(pp);
 388                         break;
 389                 }
 390         }
 391         change_mode(pp, ECR_PS2);
 392         return got;
 393 }
 394
 395 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 396 {
 397         struct parport_uss720_private *priv = pp->private_data;
 398         size_t written = 0;
 399
 400         if (change_mode(pp, ECR_EPP))
 401                 return 0;
 402         for (; written < length; written++) {
 403                 if (set_1284_register(pp, 3, *(char *)buf))
 404                         break;
 405                 ((char*)buf)++;
 406                 if (get_1284_register(pp, 1, NULL))
 407                         break;
 408                 if (priv->reg[0] & 0x01) {
 409                         clear_epp_timeout(pp);
 410                         break;
 411                 }
 412         }
 413         change_mode(pp, ECR_PS2);
 414         return written;
 415 }
 416
 417 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 418 {
 419         struct parport_uss720_private *priv = pp->private_data;
 420         struct usb_device *usbdev = priv->usbdev;
 421         int rlen;
 422         int i;
 423
 424         if (!usbdev)
 425                 return 0;
 426         if (change_mode(pp, ECR_ECP))
 427                 return 0;
 428         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, HZ*20);
 429         if (i)
 430                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u rlen %u\n", buffer, len, rlen);
 431         change_mode(pp, ECR_PS2);
 432         return rlen;
 433 }
 434
 435 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 436 {
 437         struct parport_uss720_private *priv = pp->private_data;
 438         struct usb_device *usbdev = priv->usbdev;
 439         int rlen;
 440         int i;
 441
 442         if (!usbdev)
 443                 return 0;
 444         if (change_mode(pp, ECR_ECP))
 445                 return 0;
 446         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, HZ*20);
 447         if (i)
 448                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %u rlen %u\n", buffer, len, rlen);
 449         change_mode(pp, ECR_PS2);
 450         return rlen;
 451 }
 452
 453 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 454 {
 455         size_t written = 0;
 456
 457         if (change_mode(pp, ECR_ECP))
 458                 return 0;
 459         for (; written < len; written++) {
 460                 if (set_1284_register(pp, 5, *(char *)buffer))
 461                         break;
 462                 ((char*)buffer)++;
 463         }
 464         change_mode(pp, ECR_PS2);
 465         return written;
 466 }
 467
 468 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 469 {
 470         struct parport_uss720_private *priv = pp->private_data;
 471         struct usb_device *usbdev = priv->usbdev;
 472         int rlen;
 473         int i;
 474
 475         if (!usbdev)
 476                 return 0;
 477         if (change_mode(pp, ECR_PPF))
 478                 return 0;
 479         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, HZ*20);
 480         if (i)
 481                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u rlen %u\n", buffer, len, rlen);
 482         change_mode(pp, ECR_PS2);
 483         return rlen;
 484 }
 485
 486 void parport_uss720_inc_use_count(void)
 487 {
 488         MOD_INC_USE_COUNT;
 489 }
 490
 491 void parport_uss720_dec_use_count(void)
 492 {
 493         MOD_DEC_USE_COUNT;
 494 }
 495
 496 /* --------------------------------------------------------------------- */
 497
 498 static struct parport_operations parport_uss720_ops =
 499 {
 500         parport_uss720_write_data,
 501         parport_uss720_read_data,
 502
 503         parport_uss720_write_control,
 504         parport_uss720_read_control,
 505         parport_uss720_frob_control,
 506
 507         parport_uss720_read_status,
 508
 509         parport_uss720_enable_irq,
 510         parport_uss720_disable_irq,
 511
 512         parport_uss720_data_forward,
 513         parport_uss720_data_reverse,
 514
 515         parport_uss720_init_state,
 516         parport_uss720_save_state,
 517         parport_uss720_restore_state,
 518
 519         parport_uss720_inc_use_count,
 520         parport_uss720_dec_use_count,
 521
 522         parport_uss720_epp_write_data,
 523         parport_uss720_epp_read_data,
 524         parport_uss720_epp_write_addr,
 525         parport_uss720_epp_read_addr,
 526
 527         parport_uss720_ecp_write_data,
 528         parport_uss720_ecp_read_data,
 529         parport_uss720_ecp_write_addr,
 530
 531         parport_uss720_write_compat,
 532         parport_ieee1284_read_nibble,
 533         parport_ieee1284_read_byte,
 534 };
 535
 536 /* --------------------------------------------------------------------- */
 537
 538 static void * uss720_probe(struct usb_device *usbdev, unsigned int ifnum,
 539                            const struct usb_device_id *id)
 540 {
 541         struct usb_interface_descriptor *interface;
 542         struct usb_endpoint_descriptor *endpoint;
 543         struct parport_uss720_private *priv;
 544         struct parport *pp;
 545         int i;
 546
 547         printk(KERN_DEBUG "uss720: probe: vendor id 0x%x, device id 0x%x\n",
 548                usbdev->descriptor.idVendor, usbdev->descriptor.idProduct);
 549
 550         /* our known interfaces have 3 alternate settings */
 551         if (usbdev->actconfig->interface[ifnum].num_altsetting != 3)
 552                 return NULL;
 553
 554         i = usb_set_interface(usbdev, ifnum, 2);
 555         printk(KERN_DEBUG "uss720: set inteface result %d\n", i);
 556
 557         interface = &usbdev->actconfig->interface[ifnum].altsetting[2];
 558
 559         /*
 560          * Allocate parport interface
 561          */
 562         printk(KERN_INFO "uss720: (C) 1999 by Thomas Sailer, <sailer@ife.ee.ethz.ch>\n");
 563
 564         if (!(priv = kmalloc(sizeof(struct parport_uss720_private), GFP_KERNEL)))
 565                 return NULL;
 566         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 567                 printk(KERN_WARNING "usb-uss720: could not register parport\n");
 568                 goto probe_abort;
 569         }
 570
 571         pp->private_data = priv;
 572         priv->usbdev = usbdev;
 573         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 574
 575         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 576         set_1284_register(pp, 7, 0x00);
 577         set_1284_register(pp, 6, 0x30);  /* PS/2 mode */
 578         set_1284_register(pp, 2, 0x0c);
 579         /* debugging */
 580         get_1284_register(pp, 0, NULL);
 581         printk("uss720: reg: %02x %02x %02x %02x %02x %02x %02x\n",
 582                priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]);
 583
 584         endpoint = &interface->endpoint[2];
 585         printk(KERN_DEBUG "uss720: epaddr %d interval %d\n", endpoint->bEndpointAddress, endpoint->bInterval);
 586 #if 0
 587         priv->irqpipe = usb_rcvctrlpipe(usbdev, endpoint->bEndpointAddress);
 588         i = usb_request_irq(usbdev, priv->irqpipe,
 589                                   uss720_irq, endpoint->bInterval,
 590                                   pp, &priv->irqhandle);
 591         if (i) {
 592                 printk (KERN_WARNING "usb-uss720: usb_request_irq failed (0x%x)\n", i);
 593                 goto probe_abort_port;
 594         }
 595 #endif
 596         parport_proc_register(pp);
 597         parport_announce_port(pp);
 598
 599         MOD_INC_USE_COUNT;
 600         return pp;
 601
 602 #if 0
 603 probe_abort_port:
 604         parport_unregister_port(pp);
 605 #endif
 606 probe_abort:
 607         kfree(priv);
 608         return NULL;
 609 }
 610
 611 static void uss720_disconnect(struct usb_device *usbdev, void *ptr)
 612 {
 613         struct parport *pp = (struct parport *)ptr;
 614         struct parport_uss720_private *priv = pp->private_data;
 615
 616 #if 0
 617         usb_release_irq(usbdev, priv->irqhandle, priv->irqpipe);
 618 #endif
 619         priv->usbdev = NULL;
 620         parport_proc_unregister(pp);
 621         parport_unregister_port(pp);
 622         kfree(priv);
 623         MOD_DEC_USE_COUNT;
 624 }
 625
 626 /* table of cables that work through this driver */
 627 static struct usb_device_id uss720_table [] = {
 628     { idVendor: 0x047e, idProduct: 0x1001},
 629     { idVendor: 0x0557, idProduct: 0x2001},
 630     { idVendor: 0x0729, idProduct: 0x1284},
 631     { }                                         /* Terminating entry */
 632 };
 633
 634 MODULE_DEVICE_TABLE (usb, uss720_table);
 635
 636
 637 static struct usb_driver uss720_driver = {
 638         name:           "uss720",
 639         probe:          uss720_probe,
 640         disconnect:     uss720_disconnect,
 641         id_table:       uss720_table,
 642 };
 643
 644 /* --------------------------------------------------------------------- */
 645
 646 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch");
 647 MODULE_DESCRIPTION("USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip");
 648
 649 static int __init uss720_init(void)
 650 {
 651         if (usb_register(&uss720_driver) < 0)
 652                 return -1;
 653
 654         printk(KERN_INFO "uss720: USB<->IEEE1284 cable driver v0.4 registered.\n"
 655                KERN_INFO "uss720: (C) 1999 by Thomas Sailer, <sailer@ife.ee.ethz.ch>\n");
 656         return 0;
 657 }
 658
 659 static void __exit uss720_cleanup(void)
 660 {
 661         usb_deregister(&uss720_driver);
 662 }
 663
 664 module_init(uss720_init);
 665 module_exit(uss720_cleanup);
 666
 667 /* --------------------------------------------------------------------- */