Pileus Git - ~andy/linux/blob - drivers/media/radio/radio-cadet.c

   1 /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
   2  *
   3  * by Fred Gleason <fredg@wava.com>
   4  * Version 0.3.3
   5  *
   6  * (Loosely) based on code for the Aztech radio card by
   7  *
   8  * Russell Kroll    (rkroll@exploits.org)
   9  * Quay Ly
  10  * Donald Song
  11  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  12  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  13  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  14  *
  15  * History:
  16  * 2000-04-29   Russell Kroll <rkroll@exploits.org>
  17  *              Added ISAPnP detection for Linux 2.3/2.4
  18  *
  19  * 2001-01-10   Russell Kroll <rkroll@exploits.org>
  20  *              Removed dead CONFIG_RADIO_CADET_PORT code
  21  *              PnP detection on load is now default (no args necessary)
  22  *
  23  * 2002-01-17   Adam Belay <ambx1@neo.rr.com>
  24  *              Updated to latest pnp code
  25  *
  26  * 2003-01-31   Alan Cox <alan@lxorguk.ukuu.org.uk>
  27  *              Cleaned up locking, delay code, general odds and ends
  28  *
  29  * 2006-07-30   Hans J. Koch <koch@hjk-az.de>
  30  *              Changed API to V4L2
  31  */
  32
  33 #include <linux/module.h>       /* Modules                      */
  34 #include <linux/init.h>         /* Initdata                     */
  35 #include <linux/ioport.h>       /* request_region               */
  36 #include <linux/delay.h>        /* udelay                       */
  37 #include <linux/videodev2.h>    /* V4L2 API defs                */
  38 #include <linux/param.h>
  39 #include <linux/pnp.h>
  40 #include <linux/sched.h>
  41 #include <linux/io.h>           /* outb, outb_p                 */
  42 #include <media/v4l2-device.h>
  43 #include <media/v4l2-ioctl.h>
  44 #include <media/v4l2-ctrls.h>
  45 #include <media/v4l2-fh.h>
  46 #include <media/v4l2-event.h>
  47
  48 MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  49 MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
  50 MODULE_LICENSE("GPL");
  51 MODULE_VERSION("0.3.4");
  52
  53 static int io = -1;             /* default to isapnp activation */
  54 static int radio_nr = -1;
  55
  56 module_param(io, int, 0);
  57 MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
  58 module_param(radio_nr, int, 0);
  59
  60 #define RDS_BUFFER 256
  61 #define RDS_RX_FLAG 1
  62 #define MBS_RX_FLAG 2
  63
  64 struct cadet {
  65         struct v4l2_device v4l2_dev;
  66         struct video_device vdev;
  67         struct v4l2_ctrl_handler ctrl_handler;
  68         int io;
  69         int curtuner;
  70         int tunestat;
  71         int sigstrength;
  72         wait_queue_head_t read_queue;
  73         struct timer_list readtimer;
  74         u8 rdsin, rdsout, rdsstat;
  75         unsigned char rdsbuf[RDS_BUFFER];
  76         struct mutex lock;
  77         int reading;
  78 };
  79
  80 static struct cadet cadet_card;
  81
  82 /*
  83  * Signal Strength Threshold Values
  84  * The V4L API spec does not define any particular unit for the signal
  85  * strength value.  These values are in microvolts of RF at the tuner's input.
  86  */
  87 static __u16 sigtable[2][4] = {
  88         { 2185, 4369, 13107, 65535 },
  89         { 1835, 2621,  4128, 65535 }
  90 };
  91
  92
  93 static int cadet_getstereo(struct cadet *dev)
  94 {
  95         int ret = V4L2_TUNER_SUB_MONO;
  96
  97         if (dev->curtuner != 0) /* Only FM has stereo capability! */
  98                 return V4L2_TUNER_SUB_MONO;
  99
 100         outb(7, dev->io);          /* Select tuner control */
 101         if ((inb(dev->io + 1) & 0x40) == 0)
 102                 ret = V4L2_TUNER_SUB_STEREO;
 103         return ret;
 104 }
 105
 106 static unsigned cadet_gettune(struct cadet *dev)
 107 {
 108         int curvol, i;
 109         unsigned fifo = 0;
 110
 111         /*
 112          * Prepare for read
 113          */
 114
 115         outb(7, dev->io);       /* Select tuner control */
 116         curvol = inb(dev->io + 1); /* Save current volume/mute setting */
 117         outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
 118         dev->tunestat = 0xffff;
 119
 120         /*
 121          * Read the shift register
 122          */
 123         for (i = 0; i < 25; i++) {
 124                 fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
 125                 if (i < 24) {
 126                         outb(0x01, dev->io + 1);
 127                         dev->tunestat &= inb(dev->io + 1);
 128                         outb(0x00, dev->io + 1);
 129                 }
 130         }
 131
 132         /*
 133          * Restore volume/mute setting
 134          */
 135         outb(curvol, dev->io + 1);
 136         return fifo;
 137 }
 138
 139 static unsigned cadet_getfreq(struct cadet *dev)
 140 {
 141         int i;
 142         unsigned freq = 0, test, fifo = 0;
 143
 144         /*
 145          * Read current tuning
 146          */
 147         fifo = cadet_gettune(dev);
 148
 149         /*
 150          * Convert to actual frequency
 151          */
 152         if (dev->curtuner == 0) {    /* FM */
 153                 test = 12500;
 154                 for (i = 0; i < 14; i++) {
 155                         if ((fifo & 0x01) != 0)
 156                                 freq += test;
 157                         test = test << 1;
 158                         fifo = fifo >> 1;
 159                 }
 160                 freq -= 10700000;           /* IF frequency is 10.7 MHz */
 161                 freq = (freq * 16) / 1000;   /* Make it 1/16 kHz */
 162         }
 163         if (dev->curtuner == 1)    /* AM */
 164                 freq = ((fifo & 0x7fff) - 2010) * 16;
 165
 166         return freq;
 167 }
 168
 169 static void cadet_settune(struct cadet *dev, unsigned fifo)
 170 {
 171         int i;
 172         unsigned test;
 173
 174         outb(7, dev->io);                /* Select tuner control */
 175         /*
 176          * Write the shift register
 177          */
 178         test = 0;
 179         test = (fifo >> 23) & 0x02;      /* Align data for SDO */
 180         test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
 181         outb(7, dev->io);                /* Select tuner control */
 182         outb(test, dev->io + 1);           /* Initialize for write */
 183         for (i = 0; i < 25; i++) {
 184                 test |= 0x01;              /* Toggle SCK High */
 185                 outb(test, dev->io + 1);
 186                 test &= 0xfe;              /* Toggle SCK Low */
 187                 outb(test, dev->io + 1);
 188                 fifo = fifo << 1;            /* Prepare the next bit */
 189                 test = 0x1c | ((fifo >> 23) & 0x02);
 190                 outb(test, dev->io + 1);
 191         }
 192 }
 193
 194 static void cadet_setfreq(struct cadet *dev, unsigned freq)
 195 {
 196         unsigned fifo;
 197         int i, j, test;
 198         int curvol;
 199
 200         /*
 201          * Formulate a fifo command
 202          */
 203         fifo = 0;
 204         if (dev->curtuner == 0) {    /* FM */
 205                 test = 102400;
 206                 freq = freq / 16;       /* Make it kHz */
 207                 freq += 10700;               /* IF is 10700 kHz */
 208                 for (i = 0; i < 14; i++) {
 209                         fifo = fifo << 1;
 210                         if (freq >= test) {
 211                                 fifo |= 0x01;
 212                                 freq -= test;
 213                         }
 214                         test = test >> 1;
 215                 }
 216         }
 217         if (dev->curtuner == 1) {    /* AM */
 218                 fifo = (freq / 16) + 2010;            /* Make it kHz */
 219                 fifo |= 0x100000;            /* Select AM Band */
 220         }
 221
 222         /*
 223          * Save current volume/mute setting
 224          */
 225
 226         outb(7, dev->io);                /* Select tuner control */
 227         curvol = inb(dev->io + 1);
 228
 229         /*
 230          * Tune the card
 231          */
 232         for (j = 3; j > -1; j--) {
 233                 cadet_settune(dev, fifo | (j << 16));
 234
 235                 outb(7, dev->io);         /* Select tuner control */
 236                 outb(curvol, dev->io + 1);
 237
 238                 msleep(100);
 239
 240                 cadet_gettune(dev);
 241                 if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
 242                         dev->sigstrength = sigtable[dev->curtuner][j];
 243                         goto reset_rds;
 244                 }
 245         }
 246         dev->sigstrength = 0;
 247 reset_rds:
 248         outb(3, dev->io);
 249         outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 250 }
 251
 252
 253 static void cadet_handler(unsigned long data)
 254 {
 255         struct cadet *dev = (void *)data;
 256
 257         /* Service the RDS fifo */
 258         if (mutex_trylock(&dev->lock)) {
 259                 outb(0x3, dev->io);       /* Select RDS Decoder Control */
 260                 if ((inb(dev->io + 1) & 0x20) != 0)
 261                         printk(KERN_CRIT "cadet: RDS fifo overflow\n");
 262                 outb(0x80, dev->io);      /* Select RDS fifo */
 263                 while ((inb(dev->io) & 0x80) != 0) {
 264                         dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
 265                         if (dev->rdsin + 1 == dev->rdsout)
 266                                 printk(KERN_WARNING "cadet: RDS buffer overflow\n");
 267                         else
 268                                 dev->rdsin++;
 269                 }
 270                 mutex_unlock(&dev->lock);
 271         }
 272
 273         /*
 274          * Service pending read
 275          */
 276         if (dev->rdsin != dev->rdsout)
 277                 wake_up_interruptible(&dev->read_queue);
 278
 279         /*
 280          * Clean up and exit
 281          */
 282         init_timer(&dev->readtimer);
 283         dev->readtimer.function = cadet_handler;
 284         dev->readtimer.data = data;
 285         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 286         add_timer(&dev->readtimer);
 287 }
 288
 289 static void cadet_start_rds(struct cadet *dev)
 290 {
 291         dev->rdsstat = 1;
 292         outb(0x80, dev->io);        /* Select RDS fifo */
 293         init_timer(&dev->readtimer);
 294         dev->readtimer.function = cadet_handler;
 295         dev->readtimer.data = (unsigned long)dev;
 296         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 297         add_timer(&dev->readtimer);
 298 }
 299
 300 static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 301 {
 302         struct cadet *dev = video_drvdata(file);
 303         unsigned char readbuf[RDS_BUFFER];
 304         int i = 0;
 305
 306         mutex_lock(&dev->lock);
 307         if (dev->rdsstat == 0)
 308                 cadet_start_rds(dev);
 309         if (dev->rdsin == dev->rdsout) {
 310                 if (file->f_flags & O_NONBLOCK) {
 311                         i = -EWOULDBLOCK;
 312                         goto unlock;
 313                 }
 314                 mutex_unlock(&dev->lock);
 315                 interruptible_sleep_on(&dev->read_queue);
 316                 mutex_lock(&dev->lock);
 317         }
 318         while (i < count && dev->rdsin != dev->rdsout)
 319                 readbuf[i++] = dev->rdsbuf[dev->rdsout++];
 320
 321         if (i && copy_to_user(data, readbuf, i))
 322                 i = -EFAULT;
 323 unlock:
 324         mutex_unlock(&dev->lock);
 325         return i;
 326 }
 327
 328
 329 static int vidioc_querycap(struct file *file, void *priv,
 330                                 struct v4l2_capability *v)
 331 {
 332         strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
 333         strlcpy(v->card, "ADS Cadet", sizeof(v->card));
 334         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 335         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
 336                           V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
 337         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 338         return 0;
 339 }
 340
 341 static int vidioc_g_tuner(struct file *file, void *priv,
 342                                 struct v4l2_tuner *v)
 343 {
 344         struct cadet *dev = video_drvdata(file);
 345
 346         v->type = V4L2_TUNER_RADIO;
 347         switch (v->index) {
 348         case 0:
 349                 strlcpy(v->name, "FM", sizeof(v->name));
 350                 v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 351                         V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW;
 352                 v->rangelow = 1400000;     /* 87.5 MHz */
 353                 v->rangehigh = 1728000;    /* 108.0 MHz */
 354                 v->rxsubchans = cadet_getstereo(dev);
 355                 v->audmode = V4L2_TUNER_MODE_STEREO;
 356                 outb(3, dev->io);
 357                 outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 358                 mdelay(100);
 359                 outb(3, dev->io);
 360                 if (inb(dev->io + 1) & 0x80)
 361                         v->rxsubchans |= V4L2_TUNER_SUB_RDS;
 362                 break;
 363         case 1:
 364                 strlcpy(v->name, "AM", sizeof(v->name));
 365                 v->capability = V4L2_TUNER_CAP_LOW;
 366                 v->rangelow = 8320;      /* 520 kHz */
 367                 v->rangehigh = 26400;    /* 1650 kHz */
 368                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 369                 v->audmode = V4L2_TUNER_MODE_MONO;
 370                 break;
 371         default:
 372                 return -EINVAL;
 373         }
 374         v->signal = dev->sigstrength; /* We might need to modify scaling of this */
 375         return 0;
 376 }
 377
 378 static int vidioc_s_tuner(struct file *file, void *priv,
 379                                 struct v4l2_tuner *v)
 380 {
 381         if (v->index != 0 && v->index != 1)
 382                 return -EINVAL;
 383         return 0;
 384 }
 385
 386 static int vidioc_g_frequency(struct file *file, void *priv,
 387                                 struct v4l2_frequency *f)
 388 {
 389         struct cadet *dev = video_drvdata(file);
 390
 391         if (f->tuner > 1)
 392                 return -EINVAL;
 393         f->type = V4L2_TUNER_RADIO;
 394         f->frequency = cadet_getfreq(dev);
 395         return 0;
 396 }
 397
 398
 399 static int vidioc_s_frequency(struct file *file, void *priv,
 400                                 struct v4l2_frequency *f)
 401 {
 402         struct cadet *dev = video_drvdata(file);
 403
 404         if (f->type != V4L2_TUNER_RADIO)
 405                 return -EINVAL;
 406         if (f->tuner == 0) {
 407                 if (f->frequency < 1400000)
 408                         f->frequency = 1400000;
 409                 else if (f->frequency > 1728000)
 410                         f->frequency = 1728000;
 411         } else if (f->tuner == 1) {
 412                 if (f->frequency < 8320)
 413                         f->frequency = 8320;
 414                 else if (f->frequency > 26400)
 415                         f->frequency = 26400;
 416         } else
 417                 return -EINVAL;
 418         cadet_setfreq(dev, f->frequency);
 419         return 0;
 420 }
 421
 422 static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
 423 {
 424         struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
 425
 426         switch (ctrl->id) {
 427         case V4L2_CID_AUDIO_MUTE:
 428                 outb(7, dev->io);                /* Select tuner control */
 429                 if (ctrl->val)
 430                         outb(0x00, dev->io + 1);
 431                 else
 432                         outb(0x20, dev->io + 1);
 433                 return 0;
 434         }
 435         return -EINVAL;
 436 }
 437
 438 static int cadet_open(struct file *file)
 439 {
 440         struct cadet *dev = video_drvdata(file);
 441         int err;
 442
 443         mutex_lock(&dev->lock);
 444         err = v4l2_fh_open(file);
 445         if (err)
 446                 goto fail;
 447         if (v4l2_fh_is_singular_file(file))
 448                 init_waitqueue_head(&dev->read_queue);
 449 fail:
 450         mutex_unlock(&dev->lock);
 451         return err;
 452 }
 453
 454 static int cadet_release(struct file *file)
 455 {
 456         struct cadet *dev = video_drvdata(file);
 457
 458         mutex_lock(&dev->lock);
 459         if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
 460                 del_timer_sync(&dev->readtimer);
 461                 dev->rdsstat = 0;
 462         }
 463         v4l2_fh_release(file);
 464         mutex_unlock(&dev->lock);
 465         return 0;
 466 }
 467
 468 static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
 469 {
 470         struct cadet *dev = video_drvdata(file);
 471         unsigned long req_events = poll_requested_events(wait);
 472         unsigned int res = v4l2_ctrl_poll(file, wait);
 473
 474         poll_wait(file, &dev->read_queue, wait);
 475         if (dev->rdsstat == 0 && (req_events & (POLLIN | POLLRDNORM))) {
 476                 mutex_lock(&dev->lock);
 477                 if (dev->rdsstat == 0)
 478                         cadet_start_rds(dev);
 479                 mutex_unlock(&dev->lock);
 480         }
 481         if (dev->rdsin != dev->rdsout)
 482                 res |= POLLIN | POLLRDNORM;
 483         return res;
 484 }
 485
 486
 487 static const struct v4l2_file_operations cadet_fops = {
 488         .owner          = THIS_MODULE,
 489         .open           = cadet_open,
 490         .release        = cadet_release,
 491         .read           = cadet_read,
 492         .unlocked_ioctl = video_ioctl2,
 493         .poll           = cadet_poll,
 494 };
 495
 496 static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
 497         .vidioc_querycap    = vidioc_querycap,
 498         .vidioc_g_tuner     = vidioc_g_tuner,
 499         .vidioc_s_tuner     = vidioc_s_tuner,
 500         .vidioc_g_frequency = vidioc_g_frequency,
 501         .vidioc_s_frequency = vidioc_s_frequency,
 502         .vidioc_log_status  = v4l2_ctrl_log_status,
 503         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 504         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 505 };
 506
 507 static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
 508         .s_ctrl = cadet_s_ctrl,
 509 };
 510
 511 #ifdef CONFIG_PNP
 512
 513 static struct pnp_device_id cadet_pnp_devices[] = {
 514         /* ADS Cadet AM/FM Radio Card */
 515         {.id = "MSM0c24", .driver_data = 0},
 516         {.id = ""}
 517 };
 518
 519 MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
 520
 521 static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 522 {
 523         if (!dev)
 524                 return -ENODEV;
 525         /* only support one device */
 526         if (io > 0)
 527                 return -EBUSY;
 528
 529         if (!pnp_port_valid(dev, 0))
 530                 return -ENODEV;
 531
 532         io = pnp_port_start(dev, 0);
 533
 534         printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
 535
 536         return io;
 537 }
 538
 539 static struct pnp_driver cadet_pnp_driver = {
 540         .name           = "radio-cadet",
 541         .id_table       = cadet_pnp_devices,
 542         .probe          = cadet_pnp_probe,
 543         .remove         = NULL,
 544 };
 545
 546 #else
 547 static struct pnp_driver cadet_pnp_driver;
 548 #endif
 549
 550 static void cadet_probe(struct cadet *dev)
 551 {
 552         static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
 553         int i;
 554
 555         for (i = 0; i < 8; i++) {
 556                 dev->io = iovals[i];
 557                 if (request_region(dev->io, 2, "cadet-probe")) {
 558                         cadet_setfreq(dev, 1410);
 559                         if (cadet_getfreq(dev) == 1410) {
 560                                 release_region(dev->io, 2);
 561                                 return;
 562                         }
 563                         release_region(dev->io, 2);
 564                 }
 565         }
 566         dev->io = -1;
 567 }
 568
 569 /*
 570  * io should only be set if the user has used something like
 571  * isapnp (the userspace program) to initialize this card for us
 572  */
 573
 574 static int __init cadet_init(void)
 575 {
 576         struct cadet *dev = &cadet_card;
 577         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 578         struct v4l2_ctrl_handler *hdl;
 579         int res = -ENODEV;
 580
 581         strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
 582         mutex_init(&dev->lock);
 583
 584         /* If a probe was requested then probe ISAPnP first (safest) */
 585         if (io < 0)
 586                 pnp_register_driver(&cadet_pnp_driver);
 587         dev->io = io;
 588
 589         /* If that fails then probe unsafely if probe is requested */
 590         if (dev->io < 0)
 591                 cadet_probe(dev);
 592
 593         /* Else we bail out */
 594         if (dev->io < 0) {
 595 #ifdef MODULE
 596                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
 597                 v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
 598 #endif
 599                 goto fail;
 600         }
 601         if (!request_region(dev->io, 2, "cadet"))
 602                 goto fail;
 603
 604         res = v4l2_device_register(NULL, v4l2_dev);
 605         if (res < 0) {
 606                 release_region(dev->io, 2);
 607                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 608                 goto fail;
 609         }
 610
 611         hdl = &dev->ctrl_handler;
 612         v4l2_ctrl_handler_init(hdl, 2);
 613         v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
 614                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 615         v4l2_dev->ctrl_handler = hdl;
 616         if (hdl->error) {
 617                 res = hdl->error;
 618                 v4l2_err(v4l2_dev, "Could not register controls\n");
 619                 goto err_hdl;
 620         }
 621
 622         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 623         dev->vdev.v4l2_dev = v4l2_dev;
 624         dev->vdev.fops = &cadet_fops;
 625         dev->vdev.ioctl_ops = &cadet_ioctl_ops;
 626         dev->vdev.release = video_device_release_empty;
 627         dev->vdev.lock = &dev->lock;
 628         set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
 629         video_set_drvdata(&dev->vdev, dev);
 630
 631         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
 632                 goto err_hdl;
 633         v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
 634         return 0;
 635 err_hdl:
 636         v4l2_ctrl_handler_free(hdl);
 637         v4l2_device_unregister(v4l2_dev);
 638         release_region(dev->io, 2);
 639 fail:
 640         pnp_unregister_driver(&cadet_pnp_driver);
 641         return res;
 642 }
 643
 644 static void __exit cadet_exit(void)
 645 {
 646         struct cadet *dev = &cadet_card;
 647
 648         video_unregister_device(&dev->vdev);
 649         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 650         v4l2_device_unregister(&dev->v4l2_dev);
 651         outb(7, dev->io);       /* Mute */
 652         outb(0x00, dev->io + 1);
 653         release_region(dev->io, 2);
 654         pnp_unregister_driver(&cadet_pnp_driver);
 655 }
 656
 657 module_init(cadet_init);
 658 module_exit(cadet_exit);
 659