summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-cadet.c
blob: 16a089fad909f241f76d6f5a8a1eb8b22f9358bb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
 *
 * by Fred Gleason <fredg@wava.com>
 * Version 0.3.3
 *
 * (Loosely) based on code for the Aztech radio card by
 *
 * Russell Kroll    (rkroll@exploits.org)
 * Quay Ly
 * Donald Song
 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
 *
 * History:
 * 2000-04-29	Russell Kroll <rkroll@exploits.org>
 *		Added ISAPnP detection for Linux 2.3/2.4
 *
 * 2001-01-10	Russell Kroll <rkroll@exploits.org>
 *		Removed dead CONFIG_RADIO_CADET_PORT code
 *		PnP detection on load is now default (no args necessary)
 *
 * 2002-01-17	Adam Belay <ambx1@neo.rr.com>
 *		Updated to latest pnp code
 *
 * 2003-01-31	Alan Cox <alan@lxorguk.ukuu.org.uk>
 *		Cleaned up locking, delay code, general odds and ends
 *
 * 2006-07-30	Hans J. Koch <koch@hjk-az.de>
 *		Changed API to V4L2
 */

#include <linux/module.h>	/* Modules 			*/
#include <linux/init.h>		/* Initdata			*/
#include <linux/ioport.h>	/* request_region		*/
#include <linux/delay.h>	/* udelay			*/
#include <linux/videodev2.h>	/* V4L2 API defs		*/
#include <linux/param.h>
#include <linux/pnp.h>
#include <linux/sched.h>
#include <linux/io.h>		/* outb, outb_p			*/
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>

MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.3.4");

static int io = -1;		/* default to isapnp activation */
static int radio_nr = -1;

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
module_param(radio_nr, int, 0);

#define RDS_BUFFER 256
#define RDS_RX_FLAG 1
#define MBS_RX_FLAG 2

struct cadet {
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int io;
	int users;
	int curtuner;
	int tunestat;
	int sigstrength;
	wait_queue_head_t read_queue;
	struct timer_list readtimer;
	__u8 rdsin, rdsout, rdsstat;
	unsigned char rdsbuf[RDS_BUFFER];
	struct mutex lock;
	int reading;
};

static struct cadet cadet_card;

/*
 * Signal Strength Threshold Values
 * The V4L API spec does not define any particular unit for the signal
 * strength value.  These values are in microvolts of RF at the tuner's input.
 */
static __u16 sigtable[2][4] = {
	{  5, 10, 30,  150 },
	{ 28, 40, 63, 1000 }
};


static int cadet_getstereo(struct cadet *dev)
{
	int ret = V4L2_TUNER_SUB_MONO;

	if (dev->curtuner != 0)	/* Only FM has stereo capability! */
		return V4L2_TUNER_SUB_MONO;

	mutex_lock(&dev->lock);
	outb(7, dev->io);          /* Select tuner control */
	if ((inb(dev->io + 1) & 0x40) == 0)
		ret = V4L2_TUNER_SUB_STEREO;
	mutex_unlock(&dev->lock);
	return ret;
}

static unsigned cadet_gettune(struct cadet *dev)
{
	int curvol, i;
	unsigned fifo = 0;

	/*
	 * Prepare for read
	 */

	mutex_lock(&dev->lock);

	outb(7, dev->io);       /* Select tuner control */
	curvol = inb(dev->io + 1); /* Save current volume/mute setting */
	outb(0x00, dev->io + 1);  /* Ensure WRITE-ENABLE is LOW */
	dev->tunestat = 0xffff;

	/*
	 * Read the shift register
	 */
	for (i = 0; i < 25; i++) {
		fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
		if (i < 24) {
			outb(0x01, dev->io + 1);
			dev->tunestat &= inb(dev->io + 1);
			outb(0x00, dev->io + 1);
		}
	}

	/*
	 * Restore volume/mute setting
	 */
	outb(curvol, dev->io + 1);
	mutex_unlock(&dev->lock);

	return fifo;
}

static unsigned cadet_getfreq(struct cadet *dev)
{
	int i;
	unsigned freq = 0, test, fifo = 0;

	/*
	 * Read current tuning
	 */
	fifo = cadet_gettune(dev);

	/*
	 * Convert to actual frequency
	 */
	if (dev->curtuner == 0) {    /* FM */
		test = 12500;
		for (i = 0; i < 14; i++) {
			if ((fifo & 0x01) != 0)
				freq += test;
			test = test << 1;
			fifo = fifo >> 1;
		}
		freq -= 10700000;           /* IF frequency is 10.7 MHz */
		freq = (freq * 16) / 1000000;   /* Make it 1/16 MHz */
	}
	if (dev->curtuner == 1)    /* AM */
		freq = ((fifo & 0x7fff) - 2010) * 16;

	return freq;
}

static void cadet_settune(struct cadet *dev, unsigned fifo)
{
	int i;
	unsigned test;

	mutex_lock(&dev->lock);

	outb(7, dev->io);                /* Select tuner control */
	/*
	 * Write the shift register
	 */
	test = 0;
	test = (fifo >> 23) & 0x02;      /* Align data for SDO */
	test |= 0x1c;                /* SDM=1, SWE=1, SEN=1, SCK=0 */
	outb(7, dev->io);                /* Select tuner control */
	outb(test, dev->io + 1);           /* Initialize for write */
	for (i = 0; i < 25; i++) {
		test |= 0x01;              /* Toggle SCK High */
		outb(test, dev->io + 1);
		test &= 0xfe;              /* Toggle SCK Low */
		outb(test, dev->io + 1);
		fifo = fifo << 1;            /* Prepare the next bit */
		test = 0x1c | ((fifo >> 23) & 0x02);
		outb(test, dev->io + 1);
	}
	mutex_unlock(&dev->lock);
}

static void cadet_setfreq(struct cadet *dev, unsigned freq)
{
	unsigned fifo;
	int i, j, test;
	int curvol;

	/*
	 * Formulate a fifo command
	 */
	fifo = 0;
	if (dev->curtuner == 0) {    /* FM */
		test = 102400;
		freq = (freq * 1000) / 16;       /* Make it kHz */
		freq += 10700;               /* IF is 10700 kHz */
		for (i = 0; i < 14; i++) {
			fifo = fifo << 1;
			if (freq >= test) {
				fifo |= 0x01;
				freq -= test;
			}
			test = test >> 1;
		}
	}
	if (dev->curtuner == 1) {    /* AM */
		fifo = (freq / 16) + 2010;            /* Make it kHz */
		fifo |= 0x100000;            /* Select AM Band */
	}

	/*
	 * Save current volume/mute setting
	 */

	mutex_lock(&dev->lock);
	outb(7, dev->io);                /* Select tuner control */
	curvol = inb(dev->io + 1);
	mutex_unlock(&dev->lock);

	/*
	 * Tune the card
	 */
	for (j = 3; j > -1; j--) {
		cadet_settune(dev, fifo | (j << 16));

		mutex_lock(&dev->lock);
		outb(7, dev->io);         /* Select tuner control */
		outb(curvol, dev->io + 1);
		mutex_unlock(&dev->lock);

		msleep(100);

		cadet_gettune(dev);
		if ((dev->tunestat & 0x40) == 0) {   /* Tuned */
			dev->sigstrength = sigtable[dev->curtuner][j];
			return;
		}
	}
	dev->sigstrength = 0;
}


static int cadet_getvol(struct cadet *dev)
{
	int ret = 0;

	mutex_lock(&dev->lock);

	outb(7, dev->io);                /* Select tuner control */
	if ((inb(dev->io + 1) & 0x20) != 0)
		ret = 0xffff;

	mutex_unlock(&dev->lock);
	return ret;
}


static void cadet_setvol(struct cadet *dev, int vol)
{
	mutex_lock(&dev->lock);
	outb(7, dev->io);                /* Select tuner control */
	if (vol > 0)
		outb(0x20, dev->io + 1);
	else
		outb(0x00, dev->io + 1);
	mutex_unlock(&dev->lock);
}

static void cadet_handler(unsigned long data)
{
	struct cadet *dev = (void *)data;

	/* Service the RDS fifo */
	if (mutex_trylock(&dev->lock)) {
		outb(0x3, dev->io);       /* Select RDS Decoder Control */
		if ((inb(dev->io + 1) & 0x20) != 0)
			printk(KERN_CRIT "cadet: RDS fifo overflow\n");
		outb(0x80, dev->io);      /* Select RDS fifo */
		while ((inb(dev->io) & 0x80) != 0) {
			dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
			if (dev->rdsin == dev->rdsout)
				printk(KERN_WARNING "cadet: RDS buffer overflow\n");
			else
				dev->rdsin++;
		}
		mutex_unlock(&dev->lock);
	}

	/*
	 * Service pending read
	 */
	if (dev->rdsin != dev->rdsout)
		wake_up_interruptible(&dev->read_queue);

	/*
	 * Clean up and exit
	 */
	init_timer(&dev->readtimer);
	dev->readtimer.function = cadet_handler;
	dev->readtimer.data = (unsigned long)0;
	dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
	add_timer(&dev->readtimer);
}


static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
	struct cadet *dev = video_drvdata(file);
	unsigned char readbuf[RDS_BUFFER];
	int i = 0;

	mutex_lock(&dev->lock);
	if (dev->rdsstat == 0) {
		dev->rdsstat = 1;
		outb(0x80, dev->io);        /* Select RDS fifo */
		init_timer(&dev->readtimer);
		dev->readtimer.function = cadet_handler;
		dev->readtimer.data = (unsigned long)dev;
		dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
		add_timer(&dev->readtimer);
	}
	if (dev->rdsin == dev->rdsout) {
		mutex_unlock(&dev->lock);
		if (file->f_flags & O_NONBLOCK)
			return -EWOULDBLOCK;
		interruptible_sleep_on(&dev->read_queue);
		mutex_lock(&dev->lock);
	}
	while (i < count && dev->rdsin != dev->rdsout)
		readbuf[i++] = dev->rdsbuf[dev->rdsout++];
	mutex_unlock(&dev->lock);

	if (copy_to_user(data, readbuf, i))
		return -EFAULT;
	return i;
}


static int vidioc_querycap(struct file *file, void *priv,
				struct v4l2_capability *v)
{
	strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
	strlcpy(v->card, "ADS Cadet", sizeof(v->card));
	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
			  V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct cadet *dev = video_drvdata(file);

	v->type = V4L2_TUNER_RADIO;
	switch (v->index) {
	case 0:
		strlcpy(v->name, "FM", sizeof(v->name));
		v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
			V4L2_TUNER_CAP_RDS_BLOCK_IO;
		v->rangelow = 1400;     /* 87.5 MHz */
		v->rangehigh = 1728;    /* 108.0 MHz */
		v->rxsubchans = cadet_getstereo(dev);
		switch (v->rxsubchans) {
		case V4L2_TUNER_SUB_MONO:
			v->audmode = V4L2_TUNER_MODE_MONO;
			break;
		case V4L2_TUNER_SUB_STEREO:
			v->audmode = V4L2_TUNER_MODE_STEREO;
			break;
		default:
			break;
		}
		v->rxsubchans |= V4L2_TUNER_SUB_RDS;
		break;
	case 1:
		strlcpy(v->name, "AM", sizeof(v->name));
		v->capability = V4L2_TUNER_CAP_LOW;
		v->rangelow = 8320;      /* 520 kHz */
		v->rangehigh = 26400;    /* 1650 kHz */
		v->rxsubchans = V4L2_TUNER_SUB_MONO;
		v->audmode = V4L2_TUNER_MODE_MONO;
		break;
	default:
		return -EINVAL;
	}
	v->signal = dev->sigstrength; /* We might need to modify scaling of this */
	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct cadet *dev = video_drvdata(file);

	if (v->index != 0 && v->index != 1)
		return -EINVAL;
	dev->curtuner = v->index;
	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct cadet *dev = video_drvdata(file);

	f->tuner = dev->curtuner;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = cadet_getfreq(dev);
	return 0;
}


static int vidioc_s_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct cadet *dev = video_drvdata(file);

	if (f->type != V4L2_TUNER_RADIO)
		return -EINVAL;
	if (dev->curtuner == 0 && (f->frequency < 1400 || f->frequency > 1728))
		return -EINVAL;
	if (dev->curtuner == 1 && (f->frequency < 8320 || f->frequency > 26400))
		return -EINVAL;
	cadet_setfreq(dev, f->frequency);
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	case V4L2_CID_AUDIO_VOLUME:
		return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
	}
	return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct cadet *dev = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
		ctrl->value = (cadet_getvol(dev) == 0);
		break;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = cadet_getvol(dev);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct cadet *dev = video_drvdata(file);

	switch (ctrl->id){
	case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
		if (ctrl->value)
			cadet_setvol(dev, 0);
		else
			cadet_setvol(dev, 0xffff);
		break;
	case V4L2_CID_AUDIO_VOLUME:
		cadet_setvol(dev, ctrl->value);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	return i ? -EINVAL : 0;
}

static int vidioc_g_audio(struct file *file, void *priv,
				struct v4l2_audio *a)
{
	a->index = 0;
	strlcpy(a->name, "Radio", sizeof(a->name));
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

static int vidioc_s_audio(struct file *file, void *priv,
				struct v4l2_audio *a)
{
	return a->index ? -EINVAL : 0;
}

static int cadet_open(struct file *file)
{
	struct cadet *dev = video_drvdata(file);

	mutex_lock(&dev->lock);
	dev->users++;
	if (1 == dev->users)
		init_waitqueue_head(&dev->read_queue);
	mutex_unlock(&dev->lock);
	return 0;
}

static int cadet_release(struct file *file)
{
	struct cadet *dev = video_drvdata(file);

	mutex_lock(&dev->lock);
	dev->users--;
	if (0 == dev->users) {
		del_timer_sync(&dev->readtimer);
		dev->rdsstat = 0;
	}
	mutex_unlock(&dev->lock);
	return 0;
}

static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
{
	struct cadet *dev = video_drvdata(file);

	poll_wait(file, &dev->read_queue, wait);
	if (dev->rdsin != dev->rdsout)
		return POLLIN | POLLRDNORM;
	return 0;
}


static const struct v4l2_file_operations cadet_fops = {
	.owner		= THIS_MODULE,
	.open		= cadet_open,
	.release       	= cadet_release,
	.read		= cadet_read,
	.unlocked_ioctl	= video_ioctl2,
	.poll		= cadet_poll,
};

static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_queryctrl   = vidioc_queryctrl,
	.vidioc_g_ctrl      = vidioc_g_ctrl,
	.vidioc_s_ctrl      = vidioc_s_ctrl,
	.vidioc_g_audio     = vidioc_g_audio,
	.vidioc_s_audio     = vidioc_s_audio,
	.vidioc_g_input     = vidioc_g_input,
	.vidioc_s_input     = vidioc_s_input,
};

#ifdef CONFIG_PNP

static struct pnp_device_id cadet_pnp_devices[] = {
	/* ADS Cadet AM/FM Radio Card */
	{.id = "MSM0c24", .driver_data = 0},
	{.id = ""}
};

MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);

static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
	if (!dev)
		return -ENODEV;
	/* only support one device */
	if (io > 0)
		return -EBUSY;

	if (!pnp_port_valid(dev, 0))
		return -ENODEV;

	io = pnp_port_start(dev, 0);

	printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);

	return io;
}

static struct pnp_driver cadet_pnp_driver = {
	.name		= "radio-cadet",
	.id_table	= cadet_pnp_devices,
	.probe		= cadet_pnp_probe,
	.remove		= NULL,
};

#else
static struct pnp_driver cadet_pnp_driver;
#endif

static void cadet_probe(struct cadet *dev)
{
	static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
	int i;

	for (i = 0; i < 8; i++) {
		dev->io = iovals[i];
		if (request_region(dev->io, 2, "cadet-probe")) {
			cadet_setfreq(dev, 1410);
			if (cadet_getfreq(dev) == 1410) {
				release_region(dev->io, 2);
				return;
			}
			release_region(dev->io, 2);
		}
	}
	dev->io = -1;
}

/*
 * io should only be set if the user has used something like
 * isapnp (the userspace program) to initialize this card for us
 */

static int __init cadet_init(void)
{
	struct cadet *dev = &cadet_card;
	struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
	mutex_init(&dev->lock);

	/* If a probe was requested then probe ISAPnP first (safest) */
	if (io < 0)
		pnp_register_driver(&cadet_pnp_driver);
	dev->io = io;

	/* If that fails then probe unsafely if probe is requested */
	if (dev->io < 0)
		cadet_probe(dev);

	/* Else we bail out */
	if (dev->io < 0) {
#ifdef MODULE
		v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
		v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
#endif
		goto fail;
	}
	if (!request_region(dev->io, 2, "cadet"))
		goto fail;

	res = v4l2_device_register(NULL, v4l2_dev);
	if (res < 0) {
		release_region(dev->io, 2);
		v4l2_err(v4l2_dev, "could not register v4l2_device\n");
		goto fail;
	}

	strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
	dev->vdev.v4l2_dev = v4l2_dev;
	dev->vdev.fops = &cadet_fops;
	dev->vdev.ioctl_ops = &cadet_ioctl_ops;
	dev->vdev.release = video_device_release_empty;
	video_set_drvdata(&dev->vdev, dev);

	if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
		v4l2_device_unregister(v4l2_dev);
		release_region(dev->io, 2);
		goto fail;
	}
	v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
	return 0;
fail:
	pnp_unregister_driver(&cadet_pnp_driver);
	return -ENODEV;
}

static void __exit cadet_exit(void)
{
	struct cadet *dev = &cadet_card;

	video_unregister_device(&dev->vdev);
	v4l2_device_unregister(&dev->v4l2_dev);
	release_region(dev->io, 2);
	pnp_unregister_driver(&cadet_pnp_driver);
}

module_init(cadet_init);
module_exit(cadet_exit);

OpenPOWER on IntegriCloud