summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/dsbr100.c
blob: cc54ed4efc488fb49ad60102e1eb682e86b9ec35 (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
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
/* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
 The device plugs into both the USB and an analog audio input, so this thing
 only deals with initialisation and frequency setting, the
 audio data has to be handled by a sound driver.

 Major issue: I can't find out where the device reports the signal
 strength, and indeed the windows software appearantly just looks
 at the stereo indicator as well.  So, scanning will only find
 stereo stations.  Sad, but I can't help it.

 Also, the windows program sends oodles of messages over to the
 device, and I couldn't figure out their meaning.  My suspicion
 is that they don't have any:-)

 You might find some interesting stuff about this module at
 http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr

 Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 History:

 Version 0.44:
	Add suspend/resume functions, fix unplug of device,
	a lot of cleanups and fixes by Alexey Klimov <klimov.linux@gmail.com>

 Version 0.43:
	Oliver Neukum: avoided DMA coherency issue

 Version 0.42:
	Converted dsbr100 to use video_ioctl2
	by Douglas Landgraf <dougsland@gmail.com>

 Version 0.41-ac1:
	Alan Cox: Some cleanups and fixes

 Version 0.41:
	Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>

 Version 0.40:
	Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing

 Version 0.30:
	Markus: Updates for 2.5.x kernel and more ISO compliant source

 Version 0.25:
	PSL and Markus: Cleanup, radio now doesn't stop on device close

 Version 0.24:
	Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
	right.  Some minor cleanup, improved standalone compilation

 Version 0.23:
	Markus: Sign extension bug fixed by declaring transfer_buffer unsigned

 Version 0.22:
	Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
	thanks to Mike Cox for pointing the problem out.

 Version 0.21:
	Markus: Minor cleanup, warnings if something goes wrong, lame attempt
	to adhere to Documentation/CodingStyle

 Version 0.2:
	Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
	Markus: Copyright clarification

 Version 0.01: Markus: initial release

*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <linux/usb.h>

/*
 * Version Information
 */
#include <linux/version.h>	/* for KERNEL_VERSION MACRO	*/

#define DRIVER_VERSION "v0.44"
#define RADIO_VERSION KERNEL_VERSION(0, 4, 4)

static struct v4l2_queryctrl radio_qctrl[] = {
	{
		.id            = V4L2_CID_AUDIO_MUTE,
		.name          = "Mute",
		.minimum       = 0,
		.maximum       = 1,
		.default_value = 1,
		.type          = V4L2_CTRL_TYPE_BOOLEAN,
	},
/* HINT: the disabled controls are only here to satify kradio and such apps */
	{       .id             = V4L2_CID_AUDIO_VOLUME,
		.flags          = V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id             = V4L2_CID_AUDIO_BALANCE,
		.flags          = V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id             = V4L2_CID_AUDIO_BASS,
		.flags          = V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id             = V4L2_CID_AUDIO_TREBLE,
		.flags          = V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id             = V4L2_CID_AUDIO_LOUDNESS,
		.flags          = V4L2_CTRL_FLAG_DISABLED,
	},
};

#define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
#define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"

#define DSB100_VENDOR 0x04b4
#define DSB100_PRODUCT 0x1002

/* Commands the device appears to understand */
#define DSB100_TUNE 1
#define DSB100_ONOFF 2

#define TB_LEN 16

/* Frequency limits in MHz -- these are European values.  For Japanese
devices, that would be 76 and 91.  */
#define FREQ_MIN  87.5
#define FREQ_MAX 108.0
#define FREQ_MUL 16000

#define videodev_to_radio(d) container_of(d, struct dsbr100_device, videodev)

static int usb_dsbr100_probe(struct usb_interface *intf,
			     const struct usb_device_id *id);
static void usb_dsbr100_disconnect(struct usb_interface *intf);
static int usb_dsbr100_open(struct file *file);
static int usb_dsbr100_close(struct file *file);
static int usb_dsbr100_suspend(struct usb_interface *intf,
						pm_message_t message);
static int usb_dsbr100_resume(struct usb_interface *intf);

static int radio_nr = -1;
module_param(radio_nr, int, 0);

/* Data for one (physical) device */
struct dsbr100_device {
	struct usb_device *usbdev;
	struct video_device videodev;
	u8 *transfer_buffer;
	struct mutex lock;	/* buffer locking */
	int curfreq;
	int stereo;
	int users;
	int removed;
	int muted;
};

static struct usb_device_id usb_dsbr100_device_table [] = {
	{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);

/* USB subsystem interface */
static struct usb_driver usb_dsbr100_driver = {
	.name			= "dsbr100",
	.probe			= usb_dsbr100_probe,
	.disconnect		= usb_dsbr100_disconnect,
	.id_table		= usb_dsbr100_device_table,
	.suspend		= usb_dsbr100_suspend,
	.resume			= usb_dsbr100_resume,
	.reset_resume		= usb_dsbr100_resume,
	.supports_autosuspend	= 0,
};

/* Low-level device interface begins here */

/* switch on radio */
static int dsbr100_start(struct dsbr100_device *radio)
{
	int retval;
	int request;

	mutex_lock(&radio->lock);

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x00, 0xC7, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = USB_REQ_GET_STATUS;
		goto usb_control_msg_failed;
	}

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		DSB100_ONOFF,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x01, 0x00, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = DSB100_ONOFF;
		goto usb_control_msg_failed;
	}

	radio->muted = 0;
	mutex_unlock(&radio->lock);
	return (radio->transfer_buffer)[0];

usb_control_msg_failed:
	mutex_unlock(&radio->lock);
	dev_err(&radio->usbdev->dev,
		"%s - usb_control_msg returned %i, request %i\n",
			__func__, retval, request);
	return retval;

}

/* switch off radio */
static int dsbr100_stop(struct dsbr100_device *radio)
{
	int retval;
	int request;

	mutex_lock(&radio->lock);

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x16, 0x1C, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = USB_REQ_GET_STATUS;
		goto usb_control_msg_failed;
	}

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		DSB100_ONOFF,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x00, 0x00, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = DSB100_ONOFF;
		goto usb_control_msg_failed;
	}

	radio->muted = 1;
	mutex_unlock(&radio->lock);
	return (radio->transfer_buffer)[0];

usb_control_msg_failed:
	mutex_unlock(&radio->lock);
	dev_err(&radio->usbdev->dev,
		"%s - usb_control_msg returned %i, request %i\n",
			__func__, retval, request);
	return retval;

}

/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int dsbr100_setfreq(struct dsbr100_device *radio, int freq)
{
	int retval;
	int request;

	freq = (freq / 16 * 80) / 1000 + 856;
	mutex_lock(&radio->lock);

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		DSB100_TUNE,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		(freq >> 8) & 0x00ff, freq & 0xff,
		radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = DSB100_TUNE;
		goto usb_control_msg_failed;
	}

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x96, 0xB7, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = USB_REQ_GET_STATUS;
		goto usb_control_msg_failed;
	}

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
		0x00, 0x24, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		request = USB_REQ_GET_STATUS;
		goto usb_control_msg_failed;
	}

	radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
	mutex_unlock(&radio->lock);
	return (radio->transfer_buffer)[0];

usb_control_msg_failed:
	radio->stereo = -1;
	mutex_unlock(&radio->lock);
	dev_err(&radio->usbdev->dev,
		"%s - usb_control_msg returned %i, request %i\n",
			__func__, retval, request);
	return retval;
}

/* return the device status.  This is, in effect, just whether it
sees a stereo signal or not.  Pity. */
static void dsbr100_getstat(struct dsbr100_device *radio)
{
	int retval;

	mutex_lock(&radio->lock);

	retval = usb_control_msg(radio->usbdev,
		usb_rcvctrlpipe(radio->usbdev, 0),
		USB_REQ_GET_STATUS,
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x00 , 0x24, radio->transfer_buffer, 8, 300);

	if (retval < 0) {
		radio->stereo = -1;
		dev_err(&radio->usbdev->dev,
			"%s - usb_control_msg returned %i, request %i\n",
				__func__, retval, USB_REQ_GET_STATUS);
	} else {
		radio->stereo = !(radio->transfer_buffer[0] & 0x01);
	}

	mutex_unlock(&radio->lock);
}

/* USB subsystem interface begins here */

/*
 * Handle unplugging of the device.
 * We call video_unregister_device in any case.
 * The last function called in this procedure is
 * usb_dsbr100_video_device_release
 */
static void usb_dsbr100_disconnect(struct usb_interface *intf)
{
	struct dsbr100_device *radio = usb_get_intfdata(intf);

	usb_set_intfdata (intf, NULL);

	mutex_lock(&radio->lock);
	radio->removed = 1;
	mutex_unlock(&radio->lock);

	video_unregister_device(&radio->videodev);
}


static int vidioc_querycap(struct file *file, void *priv,
					struct v4l2_capability *v)
{
	struct dsbr100_device *radio = video_drvdata(file);

	strlcpy(v->driver, "dsbr100", sizeof(v->driver));
	strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct dsbr100_device *radio = video_drvdata(file);

	/* safety check */
	if (radio->removed)
		return -EIO;

	if (v->index > 0)
		return -EINVAL;

	dsbr100_getstat(radio);
	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = FREQ_MIN * FREQ_MUL;
	v->rangehigh = FREQ_MAX * FREQ_MUL;
	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
	v->capability = V4L2_TUNER_CAP_LOW;
	if(radio->stereo)
		v->audmode = V4L2_TUNER_MODE_STEREO;
	else
		v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal = 0xffff;     /* We can't get the signal strength */
	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct dsbr100_device *radio = video_drvdata(file);

	/* safety check */
	if (radio->removed)
		return -EIO;

	if (v->index > 0)
		return -EINVAL;

	return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct dsbr100_device *radio = video_drvdata(file);
	int retval;

	/* safety check */
	if (radio->removed)
		return -EIO;

	mutex_lock(&radio->lock);
	radio->curfreq = f->frequency;
	mutex_unlock(&radio->lock);

	retval = dsbr100_setfreq(radio, radio->curfreq);
	if (retval < 0)
		dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct dsbr100_device *radio = video_drvdata(file);

	/* safety check */
	if (radio->removed)
		return -EIO;

	f->type = V4L2_TUNER_RADIO;
	f->frequency = radio->curfreq;
	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
		if (qc->id && qc->id == radio_qctrl[i].id) {
			memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
			return 0;
		}
	}
	return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct dsbr100_device *radio = video_drvdata(file);

	/* safety check */
	if (radio->removed)
		return -EIO;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = radio->muted;
		return 0;
	}
	return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct dsbr100_device *radio = video_drvdata(file);
	int retval;

	/* safety check */
	if (radio->removed)
		return -EIO;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value) {
			retval = dsbr100_stop(radio);
			if (retval < 0) {
				dev_warn(&radio->usbdev->dev,
					 "Radio did not respond properly\n");
				return -EBUSY;
			}
		} else {
			retval = dsbr100_start(radio);
			if (retval < 0) {
				dev_warn(&radio->usbdev->dev,
					 "Radio did not respond properly\n");
				return -EBUSY;
			}
		}
		return 0;
	}
	return -EINVAL;
}

static int vidioc_g_audio(struct file *file, void *priv,
				struct v4l2_audio *a)
{
	if (a->index > 1)
		return -EINVAL;

	strcpy(a->name, "Radio");
	a->capability = V4L2_AUDCAP_STEREO;
	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)
{
	if (i != 0)
		return -EINVAL;
	return 0;
}

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

static int usb_dsbr100_open(struct file *file)
{
	struct dsbr100_device *radio = video_drvdata(file);
	int retval;

	lock_kernel();
	radio->users = 1;
	radio->muted = 1;

	retval = dsbr100_start(radio);
	if (retval < 0) {
		dev_warn(&radio->usbdev->dev,
			 "Radio did not start up properly\n");
		radio->users = 0;
		unlock_kernel();
		return -EIO;
	}

	retval = dsbr100_setfreq(radio, radio->curfreq);
	if (retval < 0)
		dev_warn(&radio->usbdev->dev,
			"set frequency failed\n");

	unlock_kernel();
	return 0;
}

static int usb_dsbr100_close(struct file *file)
{
	struct dsbr100_device *radio = video_drvdata(file);
	int retval;

	if (!radio)
		return -ENODEV;

	mutex_lock(&radio->lock);
	radio->users = 0;
	mutex_unlock(&radio->lock);

	if (!radio->removed) {
		retval = dsbr100_stop(radio);
		if (retval < 0) {
			dev_warn(&radio->usbdev->dev,
				"dsbr100_stop failed\n");
		}

	}
	return 0;
}

/* Suspend device - stop device. */
static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct dsbr100_device *radio = usb_get_intfdata(intf);
	int retval;

	retval = dsbr100_stop(radio);
	if (retval < 0)
		dev_warn(&intf->dev, "dsbr100_stop failed\n");

	dev_info(&intf->dev, "going into suspend..\n");

	return 0;
}

/* Resume device - start device. */
static int usb_dsbr100_resume(struct usb_interface *intf)
{
	struct dsbr100_device *radio = usb_get_intfdata(intf);
	int retval;

	retval = dsbr100_start(radio);
	if (retval < 0)
		dev_warn(&intf->dev, "dsbr100_start failed\n");

	dev_info(&intf->dev, "coming out of suspend..\n");

	return 0;
}

/* free data structures */
static void usb_dsbr100_video_device_release(struct video_device *videodev)
{
	struct dsbr100_device *radio = videodev_to_radio(videodev);

	kfree(radio->transfer_buffer);
	kfree(radio);
}

/* File system interface */
static const struct v4l2_file_operations usb_dsbr100_fops = {
	.owner		= THIS_MODULE,
	.open		= usb_dsbr100_open,
	.release	= usb_dsbr100_close,
	.ioctl		= video_ioctl2,
};

static const struct v4l2_ioctl_ops usb_dsbr100_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,
};

/* V4L2 interface */
static struct video_device dsbr100_videodev_data = {
	.name		= "D-Link DSB-R 100",
	.fops		= &usb_dsbr100_fops,
	.ioctl_ops 	= &usb_dsbr100_ioctl_ops,
	.release	= usb_dsbr100_video_device_release,
};

/* check if the device is present and register with v4l and usb if it is */
static int usb_dsbr100_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	struct dsbr100_device *radio;
	int retval;

	radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL);

	if (!radio)
		return -ENOMEM;

	radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);

	if (!(radio->transfer_buffer)) {
		kfree(radio);
		return -ENOMEM;
	}

	mutex_init(&radio->lock);
	radio->videodev = dsbr100_videodev_data;

	radio->removed = 0;
	radio->users = 0;
	radio->usbdev = interface_to_usbdev(intf);
	radio->curfreq = FREQ_MIN * FREQ_MUL;
	video_set_drvdata(&radio->videodev, radio);
	retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
	if (retval < 0) {
		dev_err(&intf->dev, "couldn't register video device\n");
		kfree(radio->transfer_buffer);
		kfree(radio);
		return -EIO;
	}
	usb_set_intfdata(intf, radio);
	return 0;
}

static int __init dsbr100_init(void)
{
	int retval = usb_register(&usb_dsbr100_driver);
	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");
	return retval;
}

static void __exit dsbr100_exit(void)
{
	usb_deregister(&usb_dsbr100_driver);
}

module_init (dsbr100_init);
module_exit (dsbr100_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud