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 static bool cadet_has_rds_data(struct cadet *dev)
 274 {
 275         bool result;
 276
 277         mutex_lock(&dev->lock);
 278         result = dev->rdsin != dev->rdsout;
 279         mutex_unlock(&dev->lock);
 280         return result;
 281 }
 282
 283
 284 static void cadet_handler(unsigned long data)
 285 {
 286         struct cadet *dev = (void *)data;
 287
 288         /* Service the RDS fifo */
 289         if (mutex_trylock(&dev->lock)) {
 290                 outb(0x3, dev->io);       /* Select RDS Decoder Control */
 291                 if ((inb(dev->io + 1) & 0x20) != 0)
 292                         pr_err("cadet: RDS fifo overflow\n");
 293                 outb(0x80, dev->io);      /* Select RDS fifo */
 294
 295                 while ((inb(dev->io) & 0x80) != 0) {
 296                         dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
 297                         if (dev->rdsin + 1 != dev->rdsout)
 298                                 dev->rdsin++;
 299                 }
 300                 mutex_unlock(&dev->lock);
 301         }
 302
 303         /*
 304          * Service pending read
 305          */
 306         if (cadet_has_rds_data(dev))
 307                 wake_up_interruptible(&dev->read_queue);
 308
 309         /*
 310          * Clean up and exit
 311          */
 312         setup_timer(&dev->readtimer, cadet_handler, data);
 313         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 314         add_timer(&dev->readtimer);
 315 }
 316
 317 static void cadet_start_rds(struct cadet *dev)
 318 {
 319         dev->rdsstat = 1;
 320         outb(0x80, dev->io);        /* Select RDS fifo */
 321         setup_timer(&dev->readtimer, cadet_handler, (unsigned long)dev);
 322         dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
 323         add_timer(&dev->readtimer);
 324 }
 325
 326 static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 327 {
 328         struct cadet *dev = video_drvdata(file);
 329         unsigned char readbuf[RDS_BUFFER];
 330         int i = 0;
 331
 332         mutex_lock(&dev->lock);
 333         if (dev->rdsstat == 0)
 334                 cadet_start_rds(dev);
 335         mutex_unlock(&dev->lock);
 336
 337         if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK))
 338                 return -EWOULDBLOCK;
 339         i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev));
 340         if (i)
 341                 return i;
 342
 343         mutex_lock(&dev->lock);
 344         while (i < count && dev->rdsin != dev->rdsout)
 345                 readbuf[i++] = dev->rdsbuf[dev->rdsout++];
 346         mutex_unlock(&dev->lock);
 347
 348         if (i && copy_to_user(data, readbuf, i))
 349                 return -EFAULT;
 350         return i;
 351 }
 352
 353
 354 static int vidioc_querycap(struct file *file, void *priv,
 355                                 struct v4l2_capability *v)
 356 {
 357         strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
 358         strlcpy(v->card, "ADS Cadet", sizeof(v->card));
 359         strlcpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info));
 360         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
 361                           V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
 362         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 363         return 0;
 364 }
 365
 366 static int vidioc_g_tuner(struct file *file, void *priv,
 367                                 struct v4l2_tuner *v)
 368 {
 369         struct cadet *dev = video_drvdata(file);
 370
 371         if (v->index)
 372                 return -EINVAL;
 373         v->type = V4L2_TUNER_RADIO;
 374         strlcpy(v->name, "Radio", sizeof(v->name));
 375         v->capability = bands[0].capability | bands[1].capability;
 376         v->rangelow = bands[0].rangelow;           /* 520 kHz (start of AM band) */
 377         v->rangehigh = bands[1].rangehigh;    /* 108.0 MHz (end of FM band) */
 378         if (dev->is_fm_band) {
 379                 v->rxsubchans = cadet_getstereo(dev);
 380                 outb(3, dev->io);
 381                 outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
 382                 mdelay(100);
 383                 outb(3, dev->io);
 384                 if (inb(dev->io + 1) & 0x80)
 385                         v->rxsubchans |= V4L2_TUNER_SUB_RDS;
 386         } else {
 387                 v->rangelow = 8320;      /* 520 kHz */
 388                 v->rangehigh = 26400;    /* 1650 kHz */
 389                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 390         }
 391         v->audmode = V4L2_TUNER_MODE_STEREO;
 392         v->signal = dev->sigstrength; /* We might need to modify scaling of this */
 393         return 0;
 394 }
 395
 396 static int vidioc_s_tuner(struct file *file, void *priv,
 397                                 const struct v4l2_tuner *v)
 398 {
 399         return v->index ? -EINVAL : 0;
 400 }
 401
 402 static int vidioc_enum_freq_bands(struct file *file, void *priv,
 403                                 struct v4l2_frequency_band *band)
 404 {
 405         if (band->tuner)
 406                 return -EINVAL;
 407         if (band->index >= ARRAY_SIZE(bands))
 408                 return -EINVAL;
 409         *band = bands[band->index];
 410         return 0;
 411 }
 412
 413 static int vidioc_g_frequency(struct file *file, void *priv,
 414                                 struct v4l2_frequency *f)
 415 {
 416         struct cadet *dev = video_drvdata(file);
 417
 418         if (f->tuner)
 419                 return -EINVAL;
 420         f->type = V4L2_TUNER_RADIO;
 421         f->frequency = dev->curfreq;
 422         return 0;
 423 }
 424
 425
 426 static int vidioc_s_frequency(struct file *file, void *priv,
 427                                 const struct v4l2_frequency *f)
 428 {
 429         struct cadet *dev = video_drvdata(file);
 430
 431         if (f->tuner)
 432                 return -EINVAL;
 433         dev->is_fm_band =
 434                 f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
 435         cadet_setfreq(dev, f->frequency);
 436         return 0;
 437 }
 438
 439 static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
 440 {
 441         struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
 442
 443         switch (ctrl->id) {
 444         case V4L2_CID_AUDIO_MUTE:
 445                 outb(7, dev->io);                /* Select tuner control */
 446                 if (ctrl->val)
 447                         outb(0x00, dev->io + 1);
 448                 else
 449                         outb(0x20, dev->io + 1);
 450                 return 0;
 451         }
 452         return -EINVAL;
 453 }
 454
 455 static int cadet_open(struct file *file)
 456 {
 457         struct cadet *dev = video_drvdata(file);
 458         int err;
 459
 460         mutex_lock(&dev->lock);
 461         err = v4l2_fh_open(file);
 462         if (err)
 463                 goto fail;
 464         if (v4l2_fh_is_singular_file(file))
 465                 init_waitqueue_head(&dev->read_queue);
 466 fail:
 467         mutex_unlock(&dev->lock);
 468         return err;
 469 }
 470
 471 static int cadet_release(struct file *file)
 472 {
 473         struct cadet *dev = video_drvdata(file);
 474
 475         mutex_lock(&dev->lock);
 476         if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
 477                 del_timer_sync(&dev->readtimer);
 478                 dev->rdsstat = 0;
 479         }
 480         v4l2_fh_release(file);
 481         mutex_unlock(&dev->lock);
 482         return 0;
 483 }
 484
 485 static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
 486 {
 487         struct cadet *dev = video_drvdata(file);
 488         unsigned long req_events = poll_requested_events(wait);
 489         unsigned int res = v4l2_ctrl_poll(file, wait);
 490
 491         poll_wait(file, &dev->read_queue, wait);
 492         if (dev->rdsstat == 0 && (req_events & (POLLIN | POLLRDNORM))) {
 493                 mutex_lock(&dev->lock);
 494                 if (dev->rdsstat == 0)
 495                         cadet_start_rds(dev);
 496                 mutex_unlock(&dev->lock);
 497         }
 498         if (cadet_has_rds_data(dev))
 499                 res |= POLLIN | POLLRDNORM;
 500         return res;
 501 }
 502
 503
 504 static const struct v4l2_file_operations cadet_fops = {
 505         .owner          = THIS_MODULE,
 506         .open           = cadet_open,
 507         .release        = cadet_release,
 508         .read           = cadet_read,
 509         .unlocked_ioctl = video_ioctl2,
 510         .poll           = cadet_poll,
 511 };
 512
 513 static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
 514         .vidioc_querycap    = vidioc_querycap,
 515         .vidioc_g_tuner     = vidioc_g_tuner,
 516         .vidioc_s_tuner     = vidioc_s_tuner,
 517         .vidioc_g_frequency = vidioc_g_frequency,
 518         .vidioc_s_frequency = vidioc_s_frequency,
 519         .vidioc_enum_freq_bands = vidioc_enum_freq_bands,
 520         .vidioc_log_status  = v4l2_ctrl_log_status,
 521         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 522         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 523 };
 524
 525 static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
 526         .s_ctrl = cadet_s_ctrl,
 527 };
 528
 529 #ifdef CONFIG_PNP
 530
 531 static struct pnp_device_id cadet_pnp_devices[] = {
 532         /* ADS Cadet AM/FM Radio Card */
 533         {.id = "MSM0c24", .driver_data = 0},
 534         {.id = ""}
 535 };
 536
 537 MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
 538
 539 static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 540 {
 541         if (!dev)
 542                 return -ENODEV;
 543         /* only support one device */
 544         if (io > 0)
 545                 return -EBUSY;
 546
 547         if (!pnp_port_valid(dev, 0))
 548                 return -ENODEV;
 549
 550         io = pnp_port_start(dev, 0);
 551
 552         printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
 553
 554         return io;
 555 }
 556
 557 static struct pnp_driver cadet_pnp_driver = {
 558         .name           = "radio-cadet",
 559         .id_table       = cadet_pnp_devices,
 560         .probe          = cadet_pnp_probe,
 561         .remove         = NULL,
 562 };
 563
 564 #else
 565 static struct pnp_driver cadet_pnp_driver;
 566 #endif
 567
 568 static void cadet_probe(struct cadet *dev)
 569 {
 570         static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
 571         int i;
 572
 573         for (i = 0; i < 8; i++) {
 574                 dev->io = iovals[i];
 575                 if (request_region(dev->io, 2, "cadet-probe")) {
 576                         cadet_setfreq(dev, bands[1].rangelow);
 577                         if (cadet_getfreq(dev) == bands[1].rangelow) {
 578                                 release_region(dev->io, 2);
 579                                 return;
 580                         }
 581                         release_region(dev->io, 2);
 582                 }
 583         }
 584         dev->io = -1;
 585 }
 586
 587 /*
 588  * io should only be set if the user has used something like
 589  * isapnp (the userspace program) to initialize this card for us
 590  */
 591
 592 static int __init cadet_init(void)
 593 {
 594         struct cadet *dev = &cadet_card;
 595         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 596         struct v4l2_ctrl_handler *hdl;
 597         int res = -ENODEV;
 598
 599         strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
 600         mutex_init(&dev->lock);
 601
 602         /* If a probe was requested then probe ISAPnP first (safest) */
 603         if (io < 0)
 604                 pnp_register_driver(&cadet_pnp_driver);
 605         dev->io = io;
 606
 607         /* If that fails then probe unsafely if probe is requested */
 608         if (dev->io < 0)
 609                 cadet_probe(dev);
 610
 611         /* Else we bail out */
 612         if (dev->io < 0) {
 613 #ifdef MODULE
 614                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
 615                 v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
 616 #endif
 617                 goto fail;
 618         }
 619         if (!request_region(dev->io, 2, "cadet"))
 620                 goto fail;
 621
 622         res = v4l2_device_register(NULL, v4l2_dev);
 623         if (res < 0) {
 624                 release_region(dev->io, 2);
 625                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 626                 goto fail;
 627         }
 628
 629         hdl = &dev->ctrl_handler;
 630         v4l2_ctrl_handler_init(hdl, 2);
 631         v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
 632                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 633         v4l2_dev->ctrl_handler = hdl;
 634         if (hdl->error) {
 635                 res = hdl->error;
 636                 v4l2_err(v4l2_dev, "Could not register controls\n");
 637                 goto err_hdl;
 638         }
 639
 640         dev->is_fm_band = true;
 641         dev->curfreq = bands[dev->is_fm_band].rangelow;
 642         cadet_setfreq(dev, dev->curfreq);
 643         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 644         dev->vdev.v4l2_dev = v4l2_dev;
 645         dev->vdev.fops = &cadet_fops;
 646         dev->vdev.ioctl_ops = &cadet_ioctl_ops;
 647         dev->vdev.release = video_device_release_empty;
 648         dev->vdev.lock = &dev->lock;
 649         video_set_drvdata(&dev->vdev, dev);
 650
 651         res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);
 652         if (res < 0)
 653                 goto err_hdl;
 654         v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
 655         return 0;
 656 err_hdl:
 657         v4l2_ctrl_handler_free(hdl);
 658         v4l2_device_unregister(v4l2_dev);
 659         release_region(dev->io, 2);
 660 fail:
 661         pnp_unregister_driver(&cadet_pnp_driver);
 662         return res;
 663 }
 664
 665 static void __exit cadet_exit(void)
 666 {
 667         struct cadet *dev = &cadet_card;
 668
 669         video_unregister_device(&dev->vdev);
 670         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 671         v4l2_device_unregister(&dev->v4l2_dev);
 672         outb(7, dev->io);       /* Mute */
 673         outb(0x00, dev->io + 1);
 674         release_region(dev->io, 2);
 675         pnp_unregister_driver(&cadet_pnp_driver);
 676 }
 677
 678 module_init(cadet_init);
 679 module_exit(cadet_exit);
 680