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