git.oblomov.eu Git - linux-2.6/blob - drivers/media/dvb/bt8xx/bt878.c

   1 /*
   2  * bt878.c: part of the driver for the Pinnacle PCTV Sat DVB PCI card
   3  *
   4  * Copyright (C) 2002 Peter Hettkamp <peter.hettkamp@htp-tel.de>
   5  *
   6  * large parts based on the bttv driver
   7  * Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@metzlerbros.de)
   8  *                        & Marcus Metzler (mocm@metzlerbros.de)
   9  * (c) 1999,2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/pci.h>
  33 #include <asm/io.h>
  34 #include <linux/ioport.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/page.h>
  37 #include <linux/types.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/kmod.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/init.h>
  42
  43 #include "dmxdev.h"
  44 #include "dvbdev.h"
  45 #include "bt878.h"
  46 #include "dst_priv.h"
  47
  48
  49 /**************************************/
  50 /* Miscellaneous utility  definitions */
  51 /**************************************/
  52
  53 static unsigned int bt878_verbose = 1;
  54 static unsigned int bt878_debug;
  55
  56 module_param_named(verbose, bt878_verbose, int, 0444);
  57 MODULE_PARM_DESC(verbose,
  58                  "verbose startup messages, default is 1 (yes)");
  59 module_param_named(debug, bt878_debug, int, 0644);
  60 MODULE_PARM_DESC(debug, "Turn on/off debugging, default is 0 (off).");
  61
  62 int bt878_num;
  63 struct bt878 bt878[BT878_MAX];
  64
  65 EXPORT_SYMBOL(bt878_num);
  66 EXPORT_SYMBOL(bt878);
  67
  68 #define btwrite(dat,adr)    bmtwrite((dat), (bt->bt878_mem+(adr)))
  69 #define btread(adr)         bmtread(bt->bt878_mem+(adr))
  70
  71 #define btand(dat,adr)      btwrite((dat) & btread(adr), adr)
  72 #define btor(dat,adr)       btwrite((dat) | btread(adr), adr)
  73 #define btaor(dat,mask,adr) btwrite((dat) | ((mask) & btread(adr)), adr)
  74
  75 #if defined(dprintk)
  76 #undef dprintk
  77 #endif
  78 #define dprintk if(bt878_debug) printk
  79
  80 static void bt878_mem_free(struct bt878 *bt)
  81 {
  82         if (bt->buf_cpu) {
  83                 pci_free_consistent(bt->dev, bt->buf_size, bt->buf_cpu,
  84                                     bt->buf_dma);
  85                 bt->buf_cpu = NULL;
  86         }
  87
  88         if (bt->risc_cpu) {
  89                 pci_free_consistent(bt->dev, bt->risc_size, bt->risc_cpu,
  90                                     bt->risc_dma);
  91                 bt->risc_cpu = NULL;
  92         }
  93 }
  94
  95 static int bt878_mem_alloc(struct bt878 *bt)
  96 {
  97         if (!bt->buf_cpu) {
  98                 bt->buf_size = 128 * 1024;
  99
 100                 bt->buf_cpu =
 101                     pci_alloc_consistent(bt->dev, bt->buf_size,
 102                                          &bt->buf_dma);
 103
 104                 if (!bt->buf_cpu)
 105                         return -ENOMEM;
 106
 107                 memset(bt->buf_cpu, 0, bt->buf_size);
 108         }
 109
 110         if (!bt->risc_cpu) {
 111                 bt->risc_size = PAGE_SIZE;
 112                 bt->risc_cpu =
 113                     pci_alloc_consistent(bt->dev, bt->risc_size,
 114                                          &bt->risc_dma);
 115
 116                 if (!bt->risc_cpu) {
 117                         bt878_mem_free(bt);
 118                         return -ENOMEM;
 119                 }
 120
 121                 memset(bt->risc_cpu, 0, bt->risc_size);
 122         }
 123
 124         return 0;
 125 }
 126
 127 /* RISC instructions */
 128 #define RISC_WRITE              (0x01 << 28)
 129 #define RISC_JUMP               (0x07 << 28)
 130 #define RISC_SYNC               (0x08 << 28)
 131
 132 /* RISC bits */
 133 #define RISC_WR_SOL             (1 << 27)
 134 #define RISC_WR_EOL             (1 << 26)
 135 #define RISC_IRQ                (1 << 24)
 136 #define RISC_STATUS(status)     ((((~status) & 0x0F) << 20) | ((status & 0x0F) << 16))
 137 #define RISC_SYNC_RESYNC        (1 << 15)
 138 #define RISC_SYNC_FM1           0x06
 139 #define RISC_SYNC_VRO           0x0C
 140
 141 #define RISC_FLUSH()            bt->risc_pos = 0
 142 #define RISC_INSTR(instr)       bt->risc_cpu[bt->risc_pos++] = cpu_to_le32(instr)
 143
 144 static int bt878_make_risc(struct bt878 *bt)
 145 {
 146         bt->block_bytes = bt->buf_size >> 4;
 147         bt->block_count = 1 << 4;
 148         bt->line_bytes = bt->block_bytes;
 149         bt->line_count = bt->block_count;
 150
 151         while (bt->line_bytes > 4095) {
 152                 bt->line_bytes >>= 1;
 153                 bt->line_count <<= 1;
 154         }
 155
 156         if (bt->line_count > 255) {
 157                 printk("bt878: buffer size error!\n");
 158                 return -EINVAL;
 159         }
 160         return 0;
 161 }
 162
 163
 164 static void bt878_risc_program(struct bt878 *bt, u32 op_sync_orin)
 165 {
 166         u32 buf_pos = 0;
 167         u32 line;
 168
 169         RISC_FLUSH();
 170         RISC_INSTR(RISC_SYNC | RISC_SYNC_FM1 | op_sync_orin);
 171         RISC_INSTR(0);
 172
 173         dprintk("bt878: risc len lines %u, bytes per line %u\n",
 174                         bt->line_count, bt->line_bytes);
 175         for (line = 0; line < bt->line_count; line++) {
 176                 // At the beginning of every block we issue an IRQ with previous (finished) block number set
 177                 if (!(buf_pos % bt->block_bytes))
 178                         RISC_INSTR(RISC_WRITE | RISC_WR_SOL | RISC_WR_EOL |
 179                                    RISC_IRQ |
 180                                    RISC_STATUS(((buf_pos /
 181                                                  bt->block_bytes) +
 182                                                 (bt->block_count -
 183                                                  1)) %
 184                                                bt->block_count) | bt->
 185                                    line_bytes);
 186                 else
 187                         RISC_INSTR(RISC_WRITE | RISC_WR_SOL | RISC_WR_EOL |
 188                                    bt->line_bytes);
 189                 RISC_INSTR(bt->buf_dma + buf_pos);
 190                 buf_pos += bt->line_bytes;
 191         }
 192
 193         RISC_INSTR(RISC_SYNC | op_sync_orin | RISC_SYNC_VRO);
 194         RISC_INSTR(0);
 195
 196         RISC_INSTR(RISC_JUMP);
 197         RISC_INSTR(bt->risc_dma);
 198
 199         btwrite((bt->line_count << 16) | bt->line_bytes, BT878_APACK_LEN);
 200 }
 201
 202 /*****************************/
 203 /* Start/Stop grabbing funcs */
 204 /*****************************/
 205
 206 void bt878_start(struct bt878 *bt, u32 controlreg, u32 op_sync_orin,
 207                 u32 irq_err_ignore)
 208 {
 209         u32 int_mask;
 210
 211         dprintk("bt878 debug: bt878_start (ctl=%8.8x)\n", controlreg);
 212         /* complete the writing of the risc dma program now we have
 213          * the card specifics
 214          */
 215         bt878_risc_program(bt, op_sync_orin);
 216         controlreg &= ~0x1f;
 217         controlreg |= 0x1b;
 218
 219         btwrite(bt->risc_dma, BT878_ARISC_START);
 220
 221         /* original int mask had :
 222          *    6    2    8    4    0
 223          * 1111 1111 1000 0000 0000
 224          * SCERR|OCERR|PABORT|RIPERR|FDSR|FTRGT|FBUS|RISCI
 225          * Hacked for DST to:
 226          * SCERR | OCERR | FDSR | FTRGT | FBUS | RISCI
 227          */
 228         int_mask = BT878_ASCERR | BT878_AOCERR | BT878_APABORT |
 229                 BT878_ARIPERR | BT878_APPERR | BT878_AFDSR | BT878_AFTRGT |
 230                 BT878_AFBUS | BT878_ARISCI;
 231
 232
 233         /* ignore pesky bits */
 234         int_mask &= ~irq_err_ignore;
 235
 236         btwrite(int_mask, BT878_AINT_MASK);
 237         btwrite(controlreg, BT878_AGPIO_DMA_CTL);
 238 }
 239
 240 void bt878_stop(struct bt878 *bt)
 241 {
 242         u32 stat;
 243         int i = 0;
 244
 245         dprintk("bt878 debug: bt878_stop\n");
 246
 247         btwrite(0, BT878_AINT_MASK);
 248         btand(~0x13, BT878_AGPIO_DMA_CTL);
 249
 250         do {
 251                 stat = btread(BT878_AINT_STAT);
 252                 if (!(stat & BT878_ARISC_EN))
 253                         break;
 254                 i++;
 255         } while (i < 500);
 256
 257         dprintk("bt878(%d) debug: bt878_stop, i=%d, stat=0x%8.8x\n",
 258                 bt->nr, i, stat);
 259 }
 260
 261 EXPORT_SYMBOL(bt878_start);
 262 EXPORT_SYMBOL(bt878_stop);
 263
 264 /*****************************/
 265 /* Interrupt service routine */
 266 /*****************************/
 267
 268 static irqreturn_t bt878_irq(int irq, void *dev_id)
 269 {
 270         u32 stat, astat, mask;
 271         int count;
 272         struct bt878 *bt;
 273
 274         bt = (struct bt878 *) dev_id;
 275
 276         count = 0;
 277         while (1) {
 278                 stat = btread(BT878_AINT_STAT);
 279                 mask = btread(BT878_AINT_MASK);
 280                 if (!(astat = (stat & mask)))
 281                         return IRQ_NONE;        /* this interrupt is not for me */
 282 /*              dprintk("bt878(%d) debug: irq count %d, stat 0x%8.8x, mask 0x%8.8x\n",bt->nr,count,stat,mask); */
 283                 btwrite(astat, BT878_AINT_STAT);        /* try to clear interrupt condition */
 284
 285
 286                 if (astat & (BT878_ASCERR | BT878_AOCERR)) {
 287                         if (bt878_verbose) {
 288                                 printk("bt878(%d): irq%s%s risc_pc=%08x\n",
 289                                        bt->nr,
 290                                        (astat & BT878_ASCERR) ? " SCERR" :
 291                                        "",
 292                                        (astat & BT878_AOCERR) ? " OCERR" :
 293                                        "", btread(BT878_ARISC_PC));
 294                         }
 295                 }
 296                 if (astat & (BT878_APABORT | BT878_ARIPERR | BT878_APPERR)) {
 297                         if (bt878_verbose) {
 298                                 printk
 299                                     ("bt878(%d): irq%s%s%s risc_pc=%08x\n",
 300                                      bt->nr,
 301                                      (astat & BT878_APABORT) ? " PABORT" :
 302                                      "",
 303                                      (astat & BT878_ARIPERR) ? " RIPERR" :
 304                                      "",
 305                                      (astat & BT878_APPERR) ? " PPERR" :
 306                                      "", btread(BT878_ARISC_PC));
 307                         }
 308                 }
 309                 if (astat & (BT878_AFDSR | BT878_AFTRGT | BT878_AFBUS)) {
 310                         if (bt878_verbose) {
 311                                 printk
 312                                     ("bt878(%d): irq%s%s%s risc_pc=%08x\n",
 313                                      bt->nr,
 314                                      (astat & BT878_AFDSR) ? " FDSR" : "",
 315                                      (astat & BT878_AFTRGT) ? " FTRGT" :
 316                                      "",
 317                                      (astat & BT878_AFBUS) ? " FBUS" : "",
 318                                      btread(BT878_ARISC_PC));
 319                         }
 320                 }
 321                 if (astat & BT878_ARISCI) {
 322                         bt->finished_block = (stat & BT878_ARISCS) >> 28;
 323                         tasklet_schedule(&bt->tasklet);
 324                         break;
 325                 }
 326                 count++;
 327                 if (count > 20) {
 328                         btwrite(0, BT878_AINT_MASK);
 329                         printk(KERN_ERR
 330                                "bt878(%d): IRQ lockup, cleared int mask\n",
 331                                bt->nr);
 332                         break;
 333                 }
 334         }
 335         return IRQ_HANDLED;
 336 }
 337
 338 int
 339 bt878_device_control(struct bt878 *bt, unsigned int cmd, union dst_gpio_packet *mp)
 340 {
 341         int retval;
 342
 343         retval = 0;
 344         if (mutex_lock_interruptible(&bt->gpio_lock))
 345                 return -ERESTARTSYS;
 346         /* special gpio signal */
 347         switch (cmd) {
 348             case DST_IG_ENABLE:
 349                 // dprintk("dvb_bt8xx: dst enable mask 0x%02x enb 0x%02x \n", mp->dstg.enb.mask, mp->dstg.enb.enable);
 350                 retval = bttv_gpio_enable(bt->bttv_nr,
 351                                 mp->enb.mask,
 352                                 mp->enb.enable);
 353                 break;
 354             case DST_IG_WRITE:
 355                 // dprintk("dvb_bt8xx: dst write gpio mask 0x%02x out 0x%02x\n", mp->dstg.outp.mask, mp->dstg.outp.highvals);
 356                 retval = bttv_write_gpio(bt->bttv_nr,
 357                                 mp->outp.mask,
 358                                 mp->outp.highvals);
 359
 360                 break;
 361             case DST_IG_READ:
 362                 /* read */
 363                 retval =  bttv_read_gpio(bt->bttv_nr, &mp->rd.value);
 364                 // dprintk("dvb_bt8xx: dst read gpio 0x%02x\n", (unsigned)mp->dstg.rd.value);
 365                 break;
 366             case DST_IG_TS:
 367                 /* Set packet size */
 368                 bt->TS_Size = mp->psize;
 369                 break;
 370
 371             default:
 372                 retval = -EINVAL;
 373                 break;
 374         }
 375         mutex_unlock(&bt->gpio_lock);
 376         return retval;
 377 }
 378
 379 EXPORT_SYMBOL(bt878_device_control);
 380
 381 #define BROOKTREE_878_DEVICE(vend, dev, name) \
 382         { \
 383                 .vendor = PCI_VENDOR_ID_BROOKTREE, \
 384                 .device = PCI_DEVICE_ID_BROOKTREE_878, \
 385                 .subvendor = (vend), .subdevice = (dev), \
 386                 .driver_data = (unsigned long) name \
 387         }
 388
 389 static struct pci_device_id bt878_pci_tbl[] __devinitdata = {
 390         BROOKTREE_878_DEVICE(0x0071, 0x0101, "Nebula Electronics DigiTV"),
 391         BROOKTREE_878_DEVICE(0x1461, 0x0761, "AverMedia AverTV DVB-T 761"),
 392         BROOKTREE_878_DEVICE(0x11bd, 0x001c, "Pinnacle PCTV Sat"),
 393         BROOKTREE_878_DEVICE(0x11bd, 0x0026, "Pinnacle PCTV SAT CI"),
 394         BROOKTREE_878_DEVICE(0x1822, 0x0001, "Twinhan VisionPlus DVB"),
 395         BROOKTREE_878_DEVICE(0x270f, 0xfc00,
 396                                 "ChainTech digitop DST-1000 DVB-S"),
 397         BROOKTREE_878_DEVICE(0x1461, 0x0771, "AVermedia AverTV DVB-T 771"),
 398         BROOKTREE_878_DEVICE(0x18ac, 0xdb10, "DViCO FusionHDTV DVB-T Lite"),
 399         BROOKTREE_878_DEVICE(0x18ac, 0xdb11, "Ultraview DVB-T Lite"),
 400         BROOKTREE_878_DEVICE(0x18ac, 0xd500, "DViCO FusionHDTV 5 Lite"),
 401         BROOKTREE_878_DEVICE(0x7063, 0x2000, "pcHDTV HD-2000 TV"),
 402         BROOKTREE_878_DEVICE(0x1822, 0x0026, "DNTV Live! Mini"),
 403         { }
 404 };
 405
 406 MODULE_DEVICE_TABLE(pci, bt878_pci_tbl);
 407
 408 static const char * __devinit card_name(const struct pci_device_id *id)
 409 {
 410         return id->driver_data ? (const char *)id->driver_data : "Unknown";
 411 }
 412
 413 /***********************/
 414 /* PCI device handling */
 415 /***********************/
 416
 417 static int __devinit bt878_probe(struct pci_dev *dev,
 418                                  const struct pci_device_id *pci_id)
 419 {
 420         int result = 0;
 421         unsigned char lat;
 422         struct bt878 *bt;
 423 #if defined(__powerpc__)
 424         unsigned int cmd;
 425 #endif
 426         unsigned int cardid;
 427
 428         printk(KERN_INFO "bt878: Bt878 AUDIO function found (%d).\n",
 429                bt878_num);
 430         if (bt878_num >= BT878_MAX) {
 431                 printk(KERN_ERR "bt878: Too many devices inserted\n");
 432                 result = -ENOMEM;
 433                 goto fail0;
 434         }
 435         if (pci_enable_device(dev))
 436                 return -EIO;
 437
 438         cardid = dev->subsystem_device << 16;
 439         cardid |= dev->subsystem_vendor;
 440
 441         printk(KERN_INFO "%s: card id=[0x%x],[ %s ] has DVB functions.\n",
 442                                 __func__, cardid, card_name(pci_id));
 443
 444         bt = &bt878[bt878_num];
 445         bt->dev = dev;
 446         bt->nr = bt878_num;
 447         bt->shutdown = 0;
 448
 449         bt->id = dev->device;
 450         bt->irq = dev->irq;
 451         bt->bt878_adr = pci_resource_start(dev, 0);
 452         if (!request_mem_region(pci_resource_start(dev, 0),
 453                                 pci_resource_len(dev, 0), "bt878")) {
 454                 result = -EBUSY;
 455                 goto fail0;
 456         }
 457
 458         pci_read_config_byte(dev, PCI_CLASS_REVISION, &bt->revision);
 459         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 460
 461
 462         printk(KERN_INFO "bt878(%d): Bt%x (rev %d) at %02x:%02x.%x, ",
 463                bt878_num, bt->id, bt->revision, dev->bus->number,
 464                PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 465         printk("irq: %d, latency: %d, memory: 0x%lx\n",
 466                bt->irq, lat, bt->bt878_adr);
 467
 468
 469 #if defined(__powerpc__)
 470         /* on OpenFirmware machines (PowerMac at least), PCI memory cycle */
 471         /* response on cards with no firmware is not enabled by OF */
 472         pci_read_config_dword(dev, PCI_COMMAND, &cmd);
 473         cmd = (cmd | PCI_COMMAND_MEMORY);
 474         pci_write_config_dword(dev, PCI_COMMAND, cmd);
 475 #endif
 476
 477 #ifdef __sparc__
 478         bt->bt878_mem = (unsigned char *) bt->bt878_adr;
 479 #else
 480         bt->bt878_mem = ioremap(bt->bt878_adr, 0x1000);
 481 #endif
 482
 483         /* clear interrupt mask */
 484         btwrite(0, BT848_INT_MASK);
 485
 486         result = request_irq(bt->irq, bt878_irq,
 487                              IRQF_SHARED | IRQF_DISABLED, "bt878",
 488                              (void *) bt);
 489         if (result == -EINVAL) {
 490                 printk(KERN_ERR "bt878(%d): Bad irq number or handler\n",
 491                        bt878_num);
 492                 goto fail1;
 493         }
 494         if (result == -EBUSY) {
 495                 printk(KERN_ERR
 496                        "bt878(%d): IRQ %d busy, change your PnP config in BIOS\n",
 497                        bt878_num, bt->irq);
 498                 goto fail1;
 499         }
 500         if (result < 0)
 501                 goto fail1;
 502
 503         pci_set_master(dev);
 504         pci_set_drvdata(dev, bt);
 505
 506 /*        if(init_bt878(btv) < 0) {
 507                 bt878_remove(dev);
 508                 return -EIO;
 509         }
 510 */
 511
 512         if ((result = bt878_mem_alloc(bt))) {
 513                 printk("bt878: failed to allocate memory!\n");
 514                 goto fail2;
 515         }
 516
 517         bt878_make_risc(bt);
 518         btwrite(0, BT878_AINT_MASK);
 519         bt878_num++;
 520
 521         return 0;
 522
 523       fail2:
 524         free_irq(bt->irq, bt);
 525       fail1:
 526         release_mem_region(pci_resource_start(bt->dev, 0),
 527                            pci_resource_len(bt->dev, 0));
 528       fail0:
 529         pci_disable_device(dev);
 530         return result;
 531 }
 532
 533 static void __devexit bt878_remove(struct pci_dev *pci_dev)
 534 {
 535         u8 command;
 536         struct bt878 *bt = pci_get_drvdata(pci_dev);
 537
 538         if (bt878_verbose)
 539                 printk("bt878(%d): unloading\n", bt->nr);
 540
 541         /* turn off all capturing, DMA and IRQs */
 542         btand(~0x13, BT878_AGPIO_DMA_CTL);
 543
 544         /* first disable interrupts before unmapping the memory! */
 545         btwrite(0, BT878_AINT_MASK);
 546         btwrite(~0U, BT878_AINT_STAT);
 547
 548         /* disable PCI bus-mastering */
 549         pci_read_config_byte(bt->dev, PCI_COMMAND, &command);
 550         /* Should this be &=~ ?? */
 551         command &= ~PCI_COMMAND_MASTER;
 552         pci_write_config_byte(bt->dev, PCI_COMMAND, command);
 553
 554         free_irq(bt->irq, bt);
 555         printk(KERN_DEBUG "bt878_mem: 0x%p.\n", bt->bt878_mem);
 556         if (bt->bt878_mem)
 557                 iounmap(bt->bt878_mem);
 558
 559         release_mem_region(pci_resource_start(bt->dev, 0),
 560                            pci_resource_len(bt->dev, 0));
 561         /* wake up any waiting processes
 562            because shutdown flag is set, no new processes (in this queue)
 563            are expected
 564          */
 565         bt->shutdown = 1;
 566         bt878_mem_free(bt);
 567
 568         pci_set_drvdata(pci_dev, NULL);
 569         pci_disable_device(pci_dev);
 570         return;
 571 }
 572
 573 static struct pci_driver bt878_pci_driver = {
 574       .name     = "bt878",
 575       .id_table = bt878_pci_tbl,
 576       .probe    = bt878_probe,
 577       .remove   = bt878_remove,
 578 };
 579
 580 static int bt878_pci_driver_registered;
 581
 582 /*******************************/
 583 /* Module management functions */
 584 /*******************************/
 585
 586 static int bt878_init_module(void)
 587 {
 588         bt878_num = 0;
 589         bt878_pci_driver_registered = 0;
 590
 591         printk(KERN_INFO "bt878: AUDIO driver version %d.%d.%d loaded\n",
 592                (BT878_VERSION_CODE >> 16) & 0xff,
 593                (BT878_VERSION_CODE >> 8) & 0xff,
 594                BT878_VERSION_CODE & 0xff);
 595 /*
 596         bt878_check_chipset();
 597 */
 598         /* later we register inside of bt878_find_audio_dma()
 599          * because we may want to ignore certain cards */
 600         bt878_pci_driver_registered = 1;
 601         return pci_register_driver(&bt878_pci_driver);
 602 }
 603
 604 static void bt878_cleanup_module(void)
 605 {
 606         if (bt878_pci_driver_registered) {
 607                 bt878_pci_driver_registered = 0;
 608                 pci_unregister_driver(&bt878_pci_driver);
 609         }
 610         return;
 611 }
 612
 613 module_init(bt878_init_module);
 614 module_exit(bt878_cleanup_module);
 615
 616 //MODULE_AUTHOR("XXX");
 617 MODULE_LICENSE("GPL");
 618
 619 /*
 620  * Local variables:
 621  * c-basic-offset: 8
 622  * End:
 623  */