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Linux/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 
678 

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