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         bool is_fm_band;
  70         u32 curfreq;
  71         int tunestat;
  72         int sigstrength;
  73         wait_queue_head_t read_queue;
  74         struct timer_list readtimer;
  75         u8 rdsin, rdsout, rdsstat;
  76         unsigned char rdsbuf[RDS_BUFFER];
  77         struct mutex lock;
  78         int reading;
  79 };
  80
  81 static struct cadet cadet_card;
  82
  83 /*
  84  * Signal Strength Threshold Values
  85  * The V4L API spec does not define any particular unit for the signal
  86  * strength value.  These values are in microvolts of RF at the tuner's input.
  87  */
  88 static u16 sigtable[2][4] = {
  89         { 1835, 2621,  4128, 65535 },
  90         { 2185, 4369, 13107, 65535 },
  91 };
  92
  93 static const struct v4l2_frequency_band bands[] = {
  94         {
  95                 .index = 0,
  96                 .type = V4L2_TUNER_RADIO,
  97                 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
  98                 .rangelow = 8320,      /* 520 kHz */
  99                 .rangehigh = 26400,    /* 1650 kHz */
 100                 .modulation = V4L2_BAND_MODULATION_AM,
 101         }, {
 102                 .index = 1,
 103                 .type = V4L2_TUNER_RADIO,
 104                 .capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
 105                         V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
 106                         V4L2_TUNER_CAP_FREQ_BANDS,
 107                 .rangelow = 1400000,   /* 87.5 MHz */
 108                 .rangehigh = 1728000,  /* 108.0 MHz */
 109                 .modulation = V4L2_BAND_MODULATION_FM,
 110         },
 111 };
 112
 113
 114 static int cadet_getstereo(struct cadet *dev)
 115 {
 116         int ret = V4L2_TUNER_SUB_MONO;
 117
 118         if (!dev->is_fm_band)   /* Only FM has stereo capability! */
 119                 return V4L2_TUNER_SUB_MONO;
 120
 121         outb(7, dev->io);          /* Select tuner control */
 122         if ((inb(dev->io + 1) & 0x40) == 0)
 123                 ret = V4L2_TUNER_SUB_STEREO;
 124         return ret;
 125 }
 126
 127 static unsigned cadet_gettune(struct cadet *dev)
 128 {
 129         int curvol, i;
 130         unsigned fifo = 0;
 131
 132         /*
 133          * Prepare for read
 134          */
 135
 136         outb(7, dev->io);       /* Select tuner control */
 137         curvol = inb(dev->io + 1); /* Save current volume/mute setting */
 138         outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
 139         dev->tunestat = 0xffff;
 140
 141         /*
 142          * Read the shift register
 143          */
 144         for (i = 0; i < 25; i++) {
 145                 fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
 146                 if (i < 24) {
 147                         outb(0x01, dev->io + 1);
 148                         dev->tunestat &= inb(dev->io + 1);
 149                         outb(0x00, dev->io + 1);
 150                 }
 151         }
 152
 153         /*
 154          * Restore volume/mute setting
 155          */
 156         outb(curvol, dev->io + 1);
 157         return fifo;
 158 }
 159
 160 static unsigned cadet_getfreq(struct cadet *dev)
 161 {
 162         int i;
 163         unsigned freq = 0, test, fifo = 0;
 164
 165         /*
 166          * Read current tuning
 167          */
 168         fifo = cadet_gettune(dev);
 169
 170         /*
 171          * Convert to actual frequency
 172          */
 173         if (!dev->is_fm_band)    /* AM */
 174                 return ((fifo & 0x7fff) - 450) * 16;
 175
 176         test = 12500;
 177         for (i = 0; i < 14; i++) {
 178                 if ((fifo & 0x01) != 0)
 179                         freq += test;
 180                 test = test << 1;
 181                 fifo = fifo >> 1;
 182         }
 183         freq -= 10700000;           /* IF frequency is 10.7 MHz */
 184         freq = (freq * 16) / 1000;   /* Make it 1/16 kHz */
 185         return freq;
 186 }
 187
 188 static void cadet_settune(struct cadet *dev, unsigned fifo)
 189 {
 190         int i;
 191         unsigned test;
 192
 193         outb(7, dev->io);                /* Select tuner control */
 194         /*
 195          * Write the shift register
 196          */
 197         test = 0;
 198         test = (fifo >> 23) & 0x02;      /* Align data for SDO */
 199         test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
 200         outb(7, dev->io);                /* Select tuner control */
 201         outb(test, dev->io + 1);           /* Initialize for write */
 202         for (i = 0; i < 25; i++) {
 203                 test |= 0x01;              /* Toggle SCK High */
 204                 outb(test, dev->io + 1);
 205                 test &= 0xfe;              /* Toggle SCK Low */
 206                 outb(test, dev->io + 1);
 207                 fifo = fifo << 1;            /* Prepare the next bit */
 208                 test = 0x1c | ((fifo >> 23) & 0x02);
 209                 outb(test, dev->io + 1);
 210         }
 211 }
 212
 213 static void cadet_setfreq(struct cadet *dev, unsigned freq)
 214 {
 215         unsigned fifo;
 216         int i, j, test;
 217         int curvol;
 218
 219         freq = clamp(freq, bands[dev->is_fm_band].rangelow,
 220                            bands[dev->is_fm_band].rangehigh);
 221         dev->curfreq = freq;
 222         /*
 223          * Formulate a fifo command
 224          */
 225         fifo = 0;
 226         if (dev->is_fm_band) {    /* FM */
 227                 test = 102400;
 228                 freq = freq / 16;       /* Make it kHz */
 229                 freq += 10700;               /* IF is 10700 kHz */
 230                 for (i = 0; i < 14; i++) {
 231                         fifo = fifo << 1;
 232                         if (freq >= test) {
 233                                 fifo |= 0x01;
 234                                 freq -= test;
 235                         }
 236                         test = test >> 1;
 237                 }
 238         } else {        /* AM */
 239                 fifo = (freq / 16) + 450;       /* Make it kHz */
 240                 fifo |= 0x100000;               /* Select AM Band */
 241         }
 242
 243         /*
 244          * Save current volume/mute setting
 245          */
 246
 247         outb(7, dev->io);                /* Select tuner control */
 248         curvol = inb(dev->io + 1);
 249
 250         /*
 251          * Tune the card
 252          */
 253         for (j = 3; j > -1; j--) {
 254                 cadet_settune(dev, fifo | (j << 16));
 255
 256                 outb(7, dev->io);         /* Select tuner control */
 257                 outb(curvol, dev->io + 1);
 258
 259                 msleep(100);
 260
 261                 cadet_gettune(dev);
 262                 if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
 263                         dev->sigstrength = sigtable[dev->is_fm_band][j];
 264                         goto reset_rds;
 265                 }
 266         }
 267         dev->sigstrength = 0;
 268 reset_rds:
 269         outb(3, dev->io);
 270         outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 271 }
 272
 273
 274 static void cadet_handler(unsigned long data)
 275 {
 276         struct cadet *dev = (void *)data;
 277
 278         /* Service the RDS fifo */
 279         if (mutex_trylock(&dev->lock)) {
 280                 outb(0x3, dev->io);       /* Select RDS Decoder Control */
 281                 if ((inb(dev->io + 1) & 0x20) != 0)
 282                         printk(KERN_CRIT "cadet: RDS fifo overflow\n");
 283                 outb(0x80, dev->io);      /* Select RDS fifo */
 284                 while ((inb(dev->io) & 0x80) != 0) {
 285                         dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
 286                         if (dev->rdsin + 1 == dev->rdsout)
 287                                 printk(KERN_WARNING "cadet: RDS buffer overflow\n");
 288                         else
 289                                 dev->rdsin++;
 290                 }
 291                 mutex_unlock(&dev->lock);
 292         }
 293
 294         /*
 295          * Service pending read
 296          */
 297         if (dev->rdsin != dev->rdsout)
 298                 wake_up_interruptible(&dev->read_queue);
 299
 300         /*
 301          * Clean up and exit
 302          */
 303         init_timer(&dev->readtimer);
 304         dev->readtimer.function = cadet_handler;
 305         dev->readtimer.data = data;
 306         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 307         add_timer(&dev->readtimer);
 308 }
 309
 310 static void cadet_start_rds(struct cadet *dev)
 311 {
 312         dev->rdsstat = 1;
 313         outb(0x80, dev->io);        /* Select RDS fifo */
 314         init_timer(&dev->readtimer);
 315         dev->readtimer.function = cadet_handler;
 316         dev->readtimer.data = (unsigned long)dev;
 317         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 318         add_timer(&dev->readtimer);
 319 }
 320
 321 static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 322 {
 323         struct cadet *dev = video_drvdata(file);
 324         unsigned char readbuf[RDS_BUFFER];
 325         int i = 0;
 326
 327         mutex_lock(&dev->lock);
 328         if (dev->rdsstat == 0)
 329                 cadet_start_rds(dev);
 330         if (dev->rdsin == dev->rdsout) {
 331                 if (file->f_flags & O_NONBLOCK) {
 332                         i = -EWOULDBLOCK;
 333                         goto unlock;
 334                 }
 335                 mutex_unlock(&dev->lock);
 336                 interruptible_sleep_on(&dev->read_queue);
 337                 mutex_lock(&dev->lock);
 338         }
 339         while (i < count && dev->rdsin != dev->rdsout)
 340                 readbuf[i++] = dev->rdsbuf[dev->rdsout++];
 341
 342         if (i && copy_to_user(data, readbuf, i))
 343                 i = -EFAULT;
 344 unlock:
 345         mutex_unlock(&dev->lock);
 346         return i;
 347 }
 348
 349
 350 static int vidioc_querycap(struct file *file, void *priv,
 351                                 struct v4l2_capability *v)
 352 {
 353         strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
 354         strlcpy(v->card, "ADS Cadet", sizeof(v->card));
 355         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 356         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
 357                           V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
 358         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 359         return 0;
 360 }
 361
 362 static int vidioc_g_tuner(struct file *file, void *priv,
 363                                 struct v4l2_tuner *v)
 364 {
 365         struct cadet *dev = video_drvdata(file);
 366
 367         if (v->index)
 368                 return -EINVAL;
 369         v->type = V4L2_TUNER_RADIO;
 370         strlcpy(v->name, "Radio", sizeof(v->name));
 371         v->capability = bands[0].capability | bands[1].capability;
 372         v->rangelow = bands[0].rangelow;           /* 520 kHz (start of AM band) */
 373         v->rangehigh = bands[1].rangehigh;    /* 108.0 MHz (end of FM band) */
 374         if (dev->is_fm_band) {
 375                 v->rxsubchans = cadet_getstereo(dev);
 376                 outb(3, dev->io);
 377                 outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 378                 mdelay(100);
 379                 outb(3, dev->io);
 380                 if (inb(dev->io + 1) & 0x80)
 381                         v->rxsubchans |= V4L2_TUNER_SUB_RDS;
 382         } else {
 383                 v->rangelow = 8320;      /* 520 kHz */
 384                 v->rangehigh = 26400;    /* 1650 kHz */
 385                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 386         }
 387         v->audmode = V4L2_TUNER_MODE_STEREO;
 388         v->signal = dev->sigstrength; /* We might need to modify scaling of this */
 389         return 0;
 390 }
 391
 392 static int vidioc_s_tuner(struct file *file, void *priv,
 393                                 const struct v4l2_tuner *v)
 394 {
 395         return v->index ? -EINVAL : 0;
 396 }
 397
 398 static int vidioc_enum_freq_bands(struct file *file, void *priv,
 399                                 struct v4l2_frequency_band *band)
 400 {
 401         if (band->tuner)
 402                 return -EINVAL;
 403         if (band->index >= ARRAY_SIZE(bands))
 404                 return -EINVAL;
 405         *band = bands[band->index];
 406         return 0;
 407 }
 408
 409 static int vidioc_g_frequency(struct file *file, void *priv,
 410                                 struct v4l2_frequency *f)
 411 {
 412         struct cadet *dev = video_drvdata(file);
 413
 414         if (f->tuner)
 415                 return -EINVAL;
 416         f->type = V4L2_TUNER_RADIO;
 417         f->frequency = dev->curfreq;
 418         return 0;
 419 }
 420
 421
 422 static int vidioc_s_frequency(struct file *file, void *priv,
 423                                 const struct v4l2_frequency *f)
 424 {
 425         struct cadet *dev = video_drvdata(file);
 426
 427         if (f->tuner)
 428                 return -EINVAL;
 429         dev->is_fm_band =
 430                 f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
 431         cadet_setfreq(dev, f->frequency);
 432         return 0;
 433 }
 434
 435 static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
 436 {
 437         struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
 438
 439         switch (ctrl->id) {
 440         case V4L2_CID_AUDIO_MUTE:
 441                 outb(7, dev->io);                /* Select tuner control */
 442                 if (ctrl->val)
 443                         outb(0x00, dev->io + 1);
 444                 else
 445                         outb(0x20, dev->io + 1);
 446                 return 0;
 447         }
 448         return -EINVAL;
 449 }
 450
 451 static int cadet_open(struct file *file)
 452 {
 453         struct cadet *dev = video_drvdata(file);
 454         int err;
 455
 456         mutex_lock(&dev->lock);
 457         err = v4l2_fh_open(file);
 458         if (err)
 459                 goto fail;
 460         if (v4l2_fh_is_singular_file(file))
 461                 init_waitqueue_head(&dev->read_queue);
 462 fail:
 463         mutex_unlock(&dev->lock);
 464         return err;
 465 }
 466
 467 static int cadet_release(struct file *file)
 468 {
 469         struct cadet *dev = video_drvdata(file);
 470
 471         mutex_lock(&dev->lock);
 472         if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
 473                 del_timer_sync(&dev->readtimer);
 474                 dev->rdsstat = 0;
 475         }
 476         v4l2_fh_release(file);
 477         mutex_unlock(&dev->lock);
 478         return 0;
 479 }
 480
 481 static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
 482 {
 483         struct cadet *dev = video_drvdata(file);
 484         unsigned long req_events = poll_requested_events(wait);
 485         unsigned int res = v4l2_ctrl_poll(file, wait);
 486
 487         poll_wait(file, &dev->read_queue, wait);
 488         if (dev->rdsstat == 0 && (req_events & (POLLIN | POLLRDNORM))) {
 489                 mutex_lock(&dev->lock);
 490                 if (dev->rdsstat == 0)
 491                         cadet_start_rds(dev);
 492                 mutex_unlock(&dev->lock);
 493         }
 494         if (dev->rdsin != dev->rdsout)
 495                 res |= POLLIN | POLLRDNORM;
 496         return res;
 497 }
 498
 499
 500 static const struct v4l2_file_operations cadet_fops = {
 501         .owner          = THIS_MODULE,
 502         .open           = cadet_open,
 503         .release        = cadet_release,
 504         .read           = cadet_read,
 505         .unlocked_ioctl = video_ioctl2,
 506         .poll           = cadet_poll,
 507 };
 508
 509 static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
 510         .vidioc_querycap    = vidioc_querycap,
 511         .vidioc_g_tuner     = vidioc_g_tuner,
 512         .vidioc_s_tuner     = vidioc_s_tuner,
 513         .vidioc_g_frequency = vidioc_g_frequency,
 514         .vidioc_s_frequency = vidioc_s_frequency,
 515         .vidioc_enum_freq_bands = vidioc_enum_freq_bands,
 516         .vidioc_log_status  = v4l2_ctrl_log_status,
 517         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 518         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 519 };
 520
 521 static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
 522         .s_ctrl = cadet_s_ctrl,
 523 };
 524
 525 #ifdef CONFIG_PNP
 526
 527 static struct pnp_device_id cadet_pnp_devices[] = {
 528         /* ADS Cadet AM/FM Radio Card */
 529         {.id = "MSM0c24", .driver_data = 0},
 530         {.id = ""}
 531 };
 532
 533 MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
 534
 535 static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 536 {
 537         if (!dev)
 538                 return -ENODEV;
 539         /* only support one device */
 540         if (io > 0)
 541                 return -EBUSY;
 542
 543         if (!pnp_port_valid(dev, 0))
 544                 return -ENODEV;
 545
 546         io = pnp_port_start(dev, 0);
 547
 548         printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
 549
 550         return io;
 551 }
 552
 553 static struct pnp_driver cadet_pnp_driver = {
 554         .name           = "radio-cadet",
 555         .id_table       = cadet_pnp_devices,
 556         .probe          = cadet_pnp_probe,
 557         .remove         = NULL,
 558 };
 559
 560 #else
 561 static struct pnp_driver cadet_pnp_driver;
 562 #endif
 563
 564 static void cadet_probe(struct cadet *dev)
 565 {
 566         static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
 567         int i;
 568
 569         for (i = 0; i < 8; i++) {
 570                 dev->io = iovals[i];
 571                 if (request_region(dev->io, 2, "cadet-probe")) {
 572                         cadet_setfreq(dev, bands[1].rangelow);
 573                         if (cadet_getfreq(dev) == bands[1].rangelow) {
 574                                 release_region(dev->io, 2);
 575                                 return;
 576                         }
 577                         release_region(dev->io, 2);
 578                 }
 579         }
 580         dev->io = -1;
 581 }
 582
 583 /*
 584  * io should only be set if the user has used something like
 585  * isapnp (the userspace program) to initialize this card for us
 586  */
 587
 588 static int __init cadet_init(void)
 589 {
 590         struct cadet *dev = &cadet_card;
 591         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 592         struct v4l2_ctrl_handler *hdl;
 593         int res = -ENODEV;
 594
 595         strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
 596         mutex_init(&dev->lock);
 597
 598         /* If a probe was requested then probe ISAPnP first (safest) */
 599         if (io < 0)
 600                 pnp_register_driver(&cadet_pnp_driver);
 601         dev->io = io;
 602
 603         /* If that fails then probe unsafely if probe is requested */
 604         if (dev->io < 0)
 605                 cadet_probe(dev);
 606
 607         /* Else we bail out */
 608         if (dev->io < 0) {
 609 #ifdef MODULE
 610                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
 611                 v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
 612 #endif
 613                 goto fail;
 614         }
 615         if (!request_region(dev->io, 2, "cadet"))
 616                 goto fail;
 617
 618         res = v4l2_device_register(NULL, v4l2_dev);
 619         if (res < 0) {
 620                 release_region(dev->io, 2);
 621                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 622                 goto fail;
 623         }
 624
 625         hdl = &dev->ctrl_handler;
 626         v4l2_ctrl_handler_init(hdl, 2);
 627         v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
 628                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 629         v4l2_dev->ctrl_handler = hdl;
 630         if (hdl->error) {
 631                 res = hdl->error;
 632                 v4l2_err(v4l2_dev, "Could not register controls\n");
 633                 goto err_hdl;
 634         }
 635
 636         dev->is_fm_band = true;
 637         dev->curfreq = bands[dev->is_fm_band].rangelow;
 638         cadet_setfreq(dev, dev->curfreq);
 639         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 640         dev->vdev.v4l2_dev = v4l2_dev;
 641         dev->vdev.fops = &cadet_fops;
 642         dev->vdev.ioctl_ops = &cadet_ioctl_ops;
 643         dev->vdev.release = video_device_release_empty;
 644         dev->vdev.lock = &dev->lock;
 645         set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
 646         video_set_drvdata(&dev->vdev, dev);
 647
 648         res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);
 649         if (res < 0)
 650                 goto err_hdl;
 651         v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
 652         return 0;
 653 err_hdl:
 654         v4l2_ctrl_handler_free(hdl);
 655         v4l2_device_unregister(v4l2_dev);
 656         release_region(dev->io, 2);
 657 fail:
 658         pnp_unregister_driver(&cadet_pnp_driver);
 659         return res;
 660 }
 661
 662 static void __exit cadet_exit(void)
 663 {
 664         struct cadet *dev = &cadet_card;
 665
 666         video_unregister_device(&dev->vdev);
 667         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 668         v4l2_device_unregister(&dev->v4l2_dev);
 669         outb(7, dev->io);       /* Mute */
 670         outb(0x00, dev->io + 1);
 671         release_region(dev->io, 2);
 672         pnp_unregister_driver(&cadet_pnp_driver);
 673 }
 674
 675 module_init(cadet_init);
 676 module_exit(cadet_exit);
 677