1 // SPDX-License-Identifier: GPL-2.0-only
2 /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
3  *
4  * by Fred Gleason <fredg@wava.com>
5  * Version 0.3.3
6  *
7  * (Loosely) based on code for the Aztech radio card by
8  *
9  * Russell Kroll    (rkroll@exploits.org)
10  * Quay Ly
11  * Donald Song
12  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
13  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
14  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
15  *
16  * History:
17  * 2000-04-29	Russell Kroll <rkroll@exploits.org>
18  *		Added ISAPnP detection for Linux 2.3/2.4
19  *
20  * 2001-01-10	Russell Kroll <rkroll@exploits.org>
21  *		Removed dead CONFIG_RADIO_CADET_PORT code
22  *		PnP detection on load is now default (no args necessary)
23  *
24  * 2002-01-17	Adam Belay <ambx1@neo.rr.com>
25  *		Updated to latest pnp code
26  *
27  * 2003-01-31	Alan Cox <alan@lxorguk.ukuu.org.uk>
28  *		Cleaned up locking, delay code, general odds and ends
29  *
30  * 2006-07-30	Hans J. Koch <koch@hjk-az.de>
31  *		Changed API to V4L2
32  */
33 
34 #include <linux/module.h>	/* Modules			*/
35 #include <linux/init.h>		/* Initdata			*/
36 #include <linux/ioport.h>	/* request_region		*/
37 #include <linux/delay.h>	/* udelay			*/
38 #include <linux/videodev2.h>	/* V4L2 API defs		*/
39 #include <linux/param.h>
40 #include <linux/pnp.h>
41 #include <linux/sched.h>
42 #include <linux/io.h>		/* outb, outb_p			*/
43 #include <media/v4l2-device.h>
44 #include <media/v4l2-ioctl.h>
45 #include <media/v4l2-ctrls.h>
46 #include <media/v4l2-fh.h>
47 #include <media/v4l2-event.h>
48 
49 MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
50 MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION("0.3.4");
53 
54 static int io = -1;		/* default to isapnp activation */
55 static int radio_nr = -1;
56 
57 module_param(io, int, 0);
58 MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
59 module_param(radio_nr, int, 0);
60 
61 #define RDS_BUFFER 256
62 #define RDS_RX_FLAG 1
63 #define MBS_RX_FLAG 2
64 
65 struct cadet {
66 	struct v4l2_device v4l2_dev;
67 	struct video_device vdev;
68 	struct v4l2_ctrl_handler ctrl_handler;
69 	int io;
70 	bool is_fm_band;
71 	u32 curfreq;
72 	int tunestat;
73 	int sigstrength;
74 	wait_queue_head_t read_queue;
75 	struct timer_list readtimer;
76 	u8 rdsin, rdsout, rdsstat;
77 	unsigned char rdsbuf[RDS_BUFFER];
78 	struct mutex lock;
79 	int reading;
80 };
81 
82 static struct cadet cadet_card;
83 
84 /*
85  * Signal Strength Threshold Values
86  * The V4L API spec does not define any particular unit for the signal
87  * strength value.  These values are in microvolts of RF at the tuner's input.
88  */
89 static u16 sigtable[2][4] = {
90 	{ 1835, 2621,  4128, 65535 },
91 	{ 2185, 4369, 13107, 65535 },
92 };
93 
94 static const struct v4l2_frequency_band bands[] = {
95 	{
96 		.index = 0,
97 		.type = V4L2_TUNER_RADIO,
98 		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
99 		.rangelow = 8320,      /* 520 kHz */
100 		.rangehigh = 26400,    /* 1650 kHz */
101 		.modulation = V4L2_BAND_MODULATION_AM,
102 	}, {
103 		.index = 1,
104 		.type = V4L2_TUNER_RADIO,
105 		.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
106 			V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
107 			V4L2_TUNER_CAP_FREQ_BANDS,
108 		.rangelow = 1400000,   /* 87.5 MHz */
109 		.rangehigh = 1728000,  /* 108.0 MHz */
110 		.modulation = V4L2_BAND_MODULATION_FM,
111 	},
112 };
113 
114 
115 static int cadet_getstereo(struct cadet *dev)
116 {
117 	int ret = V4L2_TUNER_SUB_MONO;
118 
119 	if (!dev->is_fm_band)	/* Only FM has stereo capability! */
120 		return V4L2_TUNER_SUB_MONO;
121 
122 	outb(7, dev->io);          /* Select tuner control */
123 	if ((inb(dev->io + 1) & 0x40) == 0)
124 		ret = V4L2_TUNER_SUB_STEREO;
125 	return ret;
126 }
127 
128 static unsigned cadet_gettune(struct cadet *dev)
129 {
130 	int curvol, i;
131 	unsigned fifo = 0;
132 
133 	/*
134 	 * Prepare for read
135 	 */
136 
137 	outb(7, dev->io);       /* Select tuner control */
138 	curvol = inb(dev->io + 1); /* Save current volume/mute setting */
139 	outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
140 	dev->tunestat = 0xffff;
141 
142 	/*
143 	 * Read the shift register
144 	 */
145 	for (i = 0; i < 25; i++) {
146 		fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
147 		if (i < 24) {
148 			outb(0x01, dev->io + 1);
149 			dev->tunestat &= inb(dev->io + 1);
150 			outb(0x00, dev->io + 1);
151 		}
152 	}
153 
154 	/*
155 	 * Restore volume/mute setting
156 	 */
157 	outb(curvol, dev->io + 1);
158 	return fifo;
159 }
160 
161 static unsigned cadet_getfreq(struct cadet *dev)
162 {
163 	int i;
164 	unsigned freq = 0, test, fifo = 0;
165 
166 	/*
167 	 * Read current tuning
168 	 */
169 	fifo = cadet_gettune(dev);
170 
171 	/*
172 	 * Convert to actual frequency
173 	 */
174 	if (!dev->is_fm_band)    /* AM */
175 		return ((fifo & 0x7fff) - 450) * 16;
176 
177 	test = 12500;
178 	for (i = 0; i < 14; i++) {
179 		if ((fifo & 0x01) != 0)
180 			freq += test;
181 		test = test << 1;
182 		fifo = fifo >> 1;
183 	}
184 	freq -= 10700000;           /* IF frequency is 10.7 MHz */
185 	freq = (freq * 16) / 1000;   /* Make it 1/16 kHz */
186 	return freq;
187 }
188 
189 static void cadet_settune(struct cadet *dev, unsigned fifo)
190 {
191 	int i;
192 	unsigned test;
193 
194 	outb(7, dev->io);                /* Select tuner control */
195 	/*
196 	 * Write the shift register
197 	 */
198 	test = 0;
199 	test = (fifo >> 23) & 0x02;      /* Align data for SDO */
200 	test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
201 	outb(7, dev->io);                /* Select tuner control */
202 	outb(test, dev->io + 1);           /* Initialize for write */
203 	for (i = 0; i < 25; i++) {
204 		test |= 0x01;              /* Toggle SCK High */
205 		outb(test, dev->io + 1);
206 		test &= 0xfe;              /* Toggle SCK Low */
207 		outb(test, dev->io + 1);
208 		fifo = fifo << 1;            /* Prepare the next bit */
209 		test = 0x1c | ((fifo >> 23) & 0x02);
210 		outb(test, dev->io + 1);
211 	}
212 }
213 
214 static void cadet_setfreq(struct cadet *dev, unsigned freq)
215 {
216 	unsigned fifo;
217 	int i, j, test;
218 	int curvol;
219 
220 	freq = clamp(freq, bands[dev->is_fm_band].rangelow,
221 			   bands[dev->is_fm_band].rangehigh);
222 	dev->curfreq = freq;
223 	/*
224 	 * Formulate a fifo command
225 	 */
226 	fifo = 0;
227 	if (dev->is_fm_band) {    /* FM */
228 		test = 102400;
229 		freq = freq / 16;       /* Make it kHz */
230 		freq += 10700;               /* IF is 10700 kHz */
231 		for (i = 0; i < 14; i++) {
232 			fifo = fifo << 1;
233 			if (freq >= test) {
234 				fifo |= 0x01;
235 				freq -= test;
236 			}
237 			test = test >> 1;
238 		}
239 	} else {	/* AM */
240 		fifo = (freq / 16) + 450;	/* Make it kHz */
241 		fifo |= 0x100000;		/* Select AM Band */
242 	}
243 
244 	/*
245 	 * Save current volume/mute setting
246 	 */
247 
248 	outb(7, dev->io);                /* Select tuner control */
249 	curvol = inb(dev->io + 1);
250 
251 	/*
252 	 * Tune the card
253 	 */
254 	for (j = 3; j > -1; j--) {
255 		cadet_settune(dev, fifo | (j << 16));
256 
257 		outb(7, dev->io);         /* Select tuner control */
258 		outb(curvol, dev->io + 1);
259 
260 		msleep(100);
261 
262 		cadet_gettune(dev);
263 		if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
264 			dev->sigstrength = sigtable[dev->is_fm_band][j];
265 			goto reset_rds;
266 		}
267 	}
268 	dev->sigstrength = 0;
269 reset_rds:
270 	outb(3, dev->io);
271 	outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
272 }
273 
274 static bool cadet_has_rds_data(struct cadet *dev)
275 {
276 	bool result;
277 
278 	mutex_lock(&dev->lock);
279 	result = dev->rdsin != dev->rdsout;
280 	mutex_unlock(&dev->lock);
281 	return result;
282 }
283 
284 
285 static void cadet_handler(struct timer_list *t)
286 {
287 	struct cadet *dev = from_timer(dev, t, readtimer);
288 
289 	/* Service the RDS fifo */
290 	if (mutex_trylock(&dev->lock)) {
291 		outb(0x3, dev->io);       /* Select RDS Decoder Control */
292 		if ((inb(dev->io + 1) & 0x20) != 0)
293 			pr_err("cadet: RDS fifo overflow\n");
294 		outb(0x80, dev->io);      /* Select RDS fifo */
295 
296 		while ((inb(dev->io) & 0x80) != 0) {
297 			dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
298 			if (dev->rdsin + 1 != dev->rdsout)
299 				dev->rdsin++;
300 		}
301 		mutex_unlock(&dev->lock);
302 	}
303 
304 	/*
305 	 * Service pending read
306 	 */
307 	if (cadet_has_rds_data(dev))
308 		wake_up_interruptible(&dev->read_queue);
309 
310 	/*
311 	 * Clean up and exit
312 	 */
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 	timer_setup(&dev->readtimer, cadet_handler, 0);
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 	strscpy(v->driver, "ADS Cadet", sizeof(v->driver));
358 	strscpy(v->card, "ADS Cadet", sizeof(v->card));
359 	strscpy(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 	strscpy(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 __poll_t cadet_poll(struct file *file, struct poll_table_struct *wait)
486 {
487 	struct cadet *dev = video_drvdata(file);
488 	__poll_t req_events = poll_requested_events(wait);
489 	__poll_t res = v4l2_ctrl_poll(file, wait);
490 
491 	poll_wait(file, &dev->read_queue, wait);
492 	if (dev->rdsstat == 0 && (req_events & (EPOLLIN | EPOLLRDNORM))) {
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 |= EPOLLIN | EPOLLRDNORM;
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 const 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 	strscpy(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 	strscpy(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 
681