summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-core/dvbdev.c
blob: 60e9c2ba26be6dca5700184655e5f4d778aa4491 (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
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
/*
 * dvbdev.c
 *
 * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
 *                  & Marcus Metzler <marcus@convergence.de>
 *                    for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * 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.
 *
 */

#define pr_fmt(fmt) "dvbdev: " fmt

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/mutex.h>
#include <media/dvbdev.h>

/* Due to enum tuner_pad_index */
#include <media/tuner.h>

static DEFINE_MUTEX(dvbdev_mutex);
static int dvbdev_debug;

module_param(dvbdev_debug, int, 0644);
MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");

#define dprintk(fmt, arg...) do {					\
	if (dvbdev_debug)						\
		printk(KERN_DEBUG pr_fmt("%s: " fmt),			\
		       __func__, ##arg);				\
} while (0)

static LIST_HEAD(dvb_adapter_list);
static DEFINE_MUTEX(dvbdev_register_lock);

static const char * const dnames[] = {
	[DVB_DEVICE_VIDEO] =		"video",
	[DVB_DEVICE_AUDIO] =		"audio",
	[DVB_DEVICE_SEC] =		"sec",
	[DVB_DEVICE_FRONTEND] =		"frontend",
	[DVB_DEVICE_DEMUX] =		"demux",
	[DVB_DEVICE_DVR] =		"dvr",
	[DVB_DEVICE_CA] =		"ca",
	[DVB_DEVICE_NET] =		"net",
	[DVB_DEVICE_OSD] =		"osd"
};

#ifdef CONFIG_DVB_DYNAMIC_MINORS
#define MAX_DVB_MINORS		256
#define DVB_MAX_IDS		MAX_DVB_MINORS
#else
#define DVB_MAX_IDS		4

static const u8 minor_type[] = {
       [DVB_DEVICE_VIDEO]      = 0,
       [DVB_DEVICE_AUDIO]      = 1,
       [DVB_DEVICE_SEC]        = 2,
       [DVB_DEVICE_FRONTEND]   = 3,
       [DVB_DEVICE_DEMUX]      = 4,
       [DVB_DEVICE_DVR]        = 5,
       [DVB_DEVICE_CA]         = 6,
       [DVB_DEVICE_NET]        = 7,
       [DVB_DEVICE_OSD]        = 8,
};

#define nums2minor(num, type, id) \
       (((num) << 6) | ((id) << 4) | minor_type[type])

#define MAX_DVB_MINORS		(DVB_MAX_ADAPTERS*64)
#endif

static struct class *dvb_class;

static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
static DECLARE_RWSEM(minor_rwsem);

static int dvb_device_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev;

	mutex_lock(&dvbdev_mutex);
	down_read(&minor_rwsem);
	dvbdev = dvb_minors[iminor(inode)];

	if (dvbdev && dvbdev->fops) {
		int err = 0;
		const struct file_operations *new_fops;

		new_fops = fops_get(dvbdev->fops);
		if (!new_fops)
			goto fail;
		file->private_data = dvbdev;
		replace_fops(file, new_fops);
		if (file->f_op->open)
			err = file->f_op->open(inode, file);
		up_read(&minor_rwsem);
		mutex_unlock(&dvbdev_mutex);
		return err;
	}
fail:
	up_read(&minor_rwsem);
	mutex_unlock(&dvbdev_mutex);
	return -ENODEV;
}


static const struct file_operations dvb_device_fops =
{
	.owner =	THIS_MODULE,
	.open =		dvb_device_open,
	.llseek =	noop_llseek,
};

static struct cdev dvb_device_cdev;

int dvb_generic_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->users)
		return -EBUSY;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		if (!dvbdev->readers)
			return -EBUSY;
		dvbdev->readers--;
	} else {
		if (!dvbdev->writers)
			return -EBUSY;
		dvbdev->writers--;
	}

	dvbdev->users--;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_open);


int dvb_generic_release(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		dvbdev->readers++;
	} else {
		dvbdev->writers++;
	}

	dvbdev->users++;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_release);


long dvb_generic_ioctl(struct file *file,
		       unsigned int cmd, unsigned long arg)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->kernel_ioctl)
		return -EINVAL;

	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
}
EXPORT_SYMBOL(dvb_generic_ioctl);


static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
{
	u32 id = 0;

	while (id < DVB_MAX_IDS) {
		struct dvb_device *dev;
		list_for_each_entry(dev, &adap->device_list, list_head)
			if (dev->type == type && dev->id == id)
				goto skip;
		return id;
skip:
		id++;
	}
	return -ENFILE;
}

static void dvb_media_device_free(struct dvb_device *dvbdev)
{
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	if (dvbdev->entity) {
		media_device_unregister_entity(dvbdev->entity);
		kfree(dvbdev->entity);
		kfree(dvbdev->pads);
		dvbdev->entity = NULL;
		dvbdev->pads = NULL;
	}

	if (dvbdev->tsout_entity) {
		int i;

		for (i = 0; i < dvbdev->tsout_num_entities; i++) {
			media_device_unregister_entity(&dvbdev->tsout_entity[i]);
			kfree(dvbdev->tsout_entity[i].name);
		}
		kfree(dvbdev->tsout_entity);
		kfree(dvbdev->tsout_pads);
		dvbdev->tsout_entity = NULL;
		dvbdev->tsout_pads = NULL;

		dvbdev->tsout_num_entities = 0;
	}

	if (dvbdev->intf_devnode) {
		media_devnode_remove(dvbdev->intf_devnode);
		dvbdev->intf_devnode = NULL;
	}

	if (dvbdev->adapter->conn) {
		media_device_unregister_entity(dvbdev->adapter->conn);
		dvbdev->adapter->conn = NULL;
		kfree(dvbdev->adapter->conn_pads);
		dvbdev->adapter->conn_pads = NULL;
	}
#endif
}

#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
				    const char *name, int npads)
{
	int i, ret = 0;

	dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
				     GFP_KERNEL);
	if (!dvbdev->tsout_pads)
		return -ENOMEM;

	dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
				       GFP_KERNEL);
	if (!dvbdev->tsout_entity)
		return -ENOMEM;

	dvbdev->tsout_num_entities = npads;

	for (i = 0; i < npads; i++) {
		struct media_pad *pads = &dvbdev->tsout_pads[i];
		struct media_entity *entity = &dvbdev->tsout_entity[i];

		entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
		if (!entity->name)
			return -ENOMEM;

		entity->function = MEDIA_ENT_F_IO_DTV;
		pads->flags = MEDIA_PAD_FL_SINK;

		ret = media_entity_pads_init(entity, 1, pads);
		if (ret < 0)
			return ret;

		ret = media_device_register_entity(dvbdev->adapter->mdev,
						   entity);
		if (ret < 0)
			return ret;
	}
	return 0;
}

#define DEMUX_TSOUT	"demux-tsout"
#define DVR_TSOUT	"dvr-tsout"

static int dvb_create_media_entity(struct dvb_device *dvbdev,
				   int type, int demux_sink_pads)
{
	int i, ret, npads;

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		npads = 2;
		break;
	case DVB_DEVICE_DVR:
		ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
					      demux_sink_pads);
		return ret;
	case DVB_DEVICE_DEMUX:
		npads = 1 + demux_sink_pads;
		ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
					      demux_sink_pads);
		if (ret < 0)
			return ret;
		break;
	case DVB_DEVICE_CA:
		npads = 2;
		break;
	case DVB_DEVICE_NET:
		/*
		 * We should be creating entities for the MPE/ULE
		 * decapsulation hardware (or software implementation).
		 *
		 * However, the number of for the MPE/ULE decaps may not be
		 * fixed. As we don't have yet dynamic support for PADs at
		 * the Media Controller, let's not create the decap
		 * entities yet.
		 */
		return 0;
	default:
		return 0;
	}

	dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
	if (!dvbdev->entity)
		return -ENOMEM;

	dvbdev->entity->name = dvbdev->name;

	if (npads) {
		dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
				       GFP_KERNEL);
		if (!dvbdev->pads)
			return -ENOMEM;
	}

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
		break;
	case DVB_DEVICE_DEMUX:
		dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		for (i = 1; i < npads; i++)
			dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
		break;
	case DVB_DEVICE_CA:
		dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
		break;
	default:
		/* Should never happen, as the first switch prevents it */
		kfree(dvbdev->entity);
		kfree(dvbdev->pads);
		dvbdev->entity = NULL;
		dvbdev->pads = NULL;
		return 0;
	}

	if (npads) {
		ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
		if (ret)
			return ret;
	}
	ret = media_device_register_entity(dvbdev->adapter->mdev,
					   dvbdev->entity);
	if (ret)
		return ret;

	pr_info("%s: media entity '%s' registered.\n",
		__func__, dvbdev->entity->name);

	return 0;
}
#endif

static int dvb_register_media_device(struct dvb_device *dvbdev,
				     int type, int minor,
				     unsigned demux_sink_pads)
{
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	struct media_link *link;
	u32 intf_type;
	int ret;

	if (!dvbdev->adapter->mdev)
		return 0;

	ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
	if (ret)
		return ret;

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		intf_type = MEDIA_INTF_T_DVB_FE;
		break;
	case DVB_DEVICE_DEMUX:
		intf_type = MEDIA_INTF_T_DVB_DEMUX;
		break;
	case DVB_DEVICE_DVR:
		intf_type = MEDIA_INTF_T_DVB_DVR;
		break;
	case DVB_DEVICE_CA:
		intf_type = MEDIA_INTF_T_DVB_CA;
		break;
	case DVB_DEVICE_NET:
		intf_type = MEDIA_INTF_T_DVB_NET;
		break;
	default:
		return 0;
	}

	dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
						    intf_type, 0,
						    DVB_MAJOR, minor);

	if (!dvbdev->intf_devnode)
		return -ENOMEM;

	/*
	 * Create the "obvious" link, e. g. the ones that represent
	 * a direct association between an interface and an entity.
	 * Other links should be created elsewhere, like:
	 *		DVB FE intf    -> tuner
	 *		DVB demux intf -> dvr
	 */

	if (!dvbdev->entity)
		return 0;

	link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
				      MEDIA_LNK_FL_ENABLED);
	if (!link)
		return -ENOMEM;
#endif
	return 0;
}

int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
			const struct dvb_device *template, void *priv,
			enum dvb_device_type type, int demux_sink_pads)
{
	struct dvb_device *dvbdev;
	struct file_operations *dvbdevfops;
	struct device *clsdev;
	int minor;
	int id, ret;

	mutex_lock(&dvbdev_register_lock);

	if ((id = dvbdev_get_free_id (adap, type)) < 0){
		mutex_unlock(&dvbdev_register_lock);
		*pdvbdev = NULL;
		pr_err("%s: couldn't find free device id\n", __func__);
		return -ENFILE;
	}

	*pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);

	if (!dvbdev){
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);

	if (!dvbdevfops){
		kfree (dvbdev);
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	memcpy(dvbdev, template, sizeof(struct dvb_device));
	dvbdev->type = type;
	dvbdev->id = id;
	dvbdev->adapter = adap;
	dvbdev->priv = priv;
	dvbdev->fops = dvbdevfops;
	init_waitqueue_head (&dvbdev->wait_queue);

	memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
	dvbdevfops->owner = adap->module;

	list_add_tail (&dvbdev->list_head, &adap->device_list);

	down_write(&minor_rwsem);
#ifdef CONFIG_DVB_DYNAMIC_MINORS
	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
		if (dvb_minors[minor] == NULL)
			break;

	if (minor == MAX_DVB_MINORS) {
		kfree(dvbdevfops);
		kfree(dvbdev);
		up_write(&minor_rwsem);
		mutex_unlock(&dvbdev_register_lock);
		return -EINVAL;
	}
#else
	minor = nums2minor(adap->num, type, id);
#endif

	dvbdev->minor = minor;
	dvb_minors[minor] = dvbdev;
	up_write(&minor_rwsem);

	ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
	if (ret) {
		pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
		      __func__);

		dvb_media_device_free(dvbdev);
		kfree(dvbdevfops);
		kfree(dvbdev);
		up_write(&minor_rwsem);
		mutex_unlock(&dvbdev_register_lock);
		return ret;
	}

	mutex_unlock(&dvbdev_register_lock);

	clsdev = device_create(dvb_class, adap->device,
			       MKDEV(DVB_MAJOR, minor),
			       dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
	if (IS_ERR(clsdev)) {
		pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
		       __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
		return PTR_ERR(clsdev);
	}
	dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
		adap->num, dnames[type], id, minor, minor);

	return 0;
}
EXPORT_SYMBOL(dvb_register_device);


void dvb_remove_device(struct dvb_device *dvbdev)
{
	if (!dvbdev)
		return;

	down_write(&minor_rwsem);
	dvb_minors[dvbdev->minor] = NULL;
	up_write(&minor_rwsem);

	dvb_media_device_free(dvbdev);

	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));

	list_del (&dvbdev->list_head);
}
EXPORT_SYMBOL(dvb_remove_device);


void dvb_free_device(struct dvb_device *dvbdev)
{
	if (!dvbdev)
		return;

	kfree (dvbdev->fops);
	kfree (dvbdev);
}
EXPORT_SYMBOL(dvb_free_device);


void dvb_unregister_device(struct dvb_device *dvbdev)
{
	dvb_remove_device(dvbdev);
	dvb_free_device(dvbdev);
}
EXPORT_SYMBOL(dvb_unregister_device);


#ifdef CONFIG_MEDIA_CONTROLLER_DVB

static int dvb_create_io_intf_links(struct dvb_adapter *adap,
				    struct media_interface *intf,
				    char *name)
{
	struct media_device *mdev = adap->mdev;
	struct media_entity *entity;
	struct media_link *link;

	media_device_for_each_entity(entity, mdev) {
		if (entity->function == MEDIA_ENT_F_IO_DTV) {
			if (strncmp(entity->name, name, strlen(name)))
				continue;
			link = media_create_intf_link(entity, intf,
						      MEDIA_LNK_FL_ENABLED);
			if (!link)
				return -ENOMEM;
		}
	}
	return 0;
}

int dvb_create_media_graph(struct dvb_adapter *adap,
			   bool create_rf_connector)
{
	struct media_device *mdev = adap->mdev;
	struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
	struct media_entity *demux = NULL, *ca = NULL;
	struct media_link *link;
	struct media_interface *intf;
	unsigned demux_pad = 0;
	unsigned dvr_pad = 0;
	unsigned ntuner = 0, ndemod = 0;
	int ret;
	static const char *connector_name = "Television";

	if (!mdev)
		return 0;

	media_device_for_each_entity(entity, mdev) {
		switch (entity->function) {
		case MEDIA_ENT_F_TUNER:
			tuner = entity;
			ntuner++;
			break;
		case MEDIA_ENT_F_DTV_DEMOD:
			demod = entity;
			ndemod++;
			break;
		case MEDIA_ENT_F_TS_DEMUX:
			demux = entity;
			break;
		case MEDIA_ENT_F_DTV_CA:
			ca = entity;
			break;
		}
	}

	/*
	 * Prepare to signalize to media_create_pad_links() that multiple
	 * entities of the same type exists and a 1:n or n:1 links need to be
	 * created.
	 * NOTE: if both tuner and demod have multiple instances, it is up
	 * to the caller driver to create such links.
	 */
	if (ntuner > 1)
		tuner = NULL;
	if (ndemod > 1)
		demod = NULL;

	if (create_rf_connector) {
		conn = kzalloc(sizeof(*conn), GFP_KERNEL);
		if (!conn)
			return -ENOMEM;
		adap->conn = conn;

		adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
		if (!adap->conn_pads)
			return -ENOMEM;

		conn->flags = MEDIA_ENT_FL_CONNECTOR;
		conn->function = MEDIA_ENT_F_CONN_RF;
		conn->name = connector_name;
		adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;

		ret = media_entity_pads_init(conn, 1, adap->conn_pads);
		if (ret)
			return ret;

		ret = media_device_register_entity(mdev, conn);
		if (ret)
			return ret;

		if (!ntuner)
			ret = media_create_pad_links(mdev,
						     MEDIA_ENT_F_CONN_RF,
						     conn, 0,
						     MEDIA_ENT_F_DTV_DEMOD,
						     demod, 0,
						     MEDIA_LNK_FL_ENABLED,
						     false);
		else
			ret = media_create_pad_links(mdev,
						     MEDIA_ENT_F_CONN_RF,
						     conn, 0,
						     MEDIA_ENT_F_TUNER,
						     tuner, TUNER_PAD_RF_INPUT,
						     MEDIA_LNK_FL_ENABLED,
						     false);
		if (ret)
			return ret;
	}

	if (ntuner && ndemod) {
		ret = media_create_pad_links(mdev,
					     MEDIA_ENT_F_TUNER,
					     tuner, TUNER_PAD_OUTPUT,
					     MEDIA_ENT_F_DTV_DEMOD,
					     demod, 0, MEDIA_LNK_FL_ENABLED,
					     false);
		if (ret)
			return ret;
	}

	if (ndemod && demux) {
		ret = media_create_pad_links(mdev,
					     MEDIA_ENT_F_DTV_DEMOD,
					     demod, 1,
					     MEDIA_ENT_F_TS_DEMUX,
					     demux, 0, MEDIA_LNK_FL_ENABLED,
					     false);
		if (ret)
			return ret;
	}
	if (demux && ca) {
		ret = media_create_pad_link(demux, 1, ca,
					    0, MEDIA_LNK_FL_ENABLED);
		if (ret)
			return ret;
	}

	/* Create demux links for each ringbuffer/pad */
	if (demux) {
		media_device_for_each_entity(entity, mdev) {
			if (entity->function == MEDIA_ENT_F_IO_DTV) {
				if (!strncmp(entity->name, DVR_TSOUT,
				    strlen(DVR_TSOUT))) {
					ret = media_create_pad_link(demux,
								++dvr_pad,
							    entity, 0, 0);
					if (ret)
						return ret;
				}
				if (!strncmp(entity->name, DEMUX_TSOUT,
				    strlen(DEMUX_TSOUT))) {
					ret = media_create_pad_link(demux,
							      ++demux_pad,
							    entity, 0, 0);
					if (ret)
						return ret;
				}
			}
		}
	}

	/* Create interface links for FE->tuner, DVR->demux and CA->ca */
	media_device_for_each_intf(intf, mdev) {
		if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
			link = media_create_intf_link(ca, intf,
						      MEDIA_LNK_FL_ENABLED);
			if (!link)
				return -ENOMEM;
		}

		if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
			link = media_create_intf_link(tuner, intf,
						      MEDIA_LNK_FL_ENABLED);
			if (!link)
				return -ENOMEM;
		}
#if 0
		/*
		 * Indirect link - let's not create yet, as we don't know how
		 *		   to handle indirect links, nor if this will
		 *		   actually be needed.
		 */
		if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
			link = media_create_intf_link(demux, intf,
						      MEDIA_LNK_FL_ENABLED);
			if (!link)
				return -ENOMEM;
		}
#endif
		if (intf->type == MEDIA_INTF_T_DVB_DVR) {
			ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
			if (ret)
				return ret;
		}
		if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
			ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
			if (ret)
				return ret;
		}
	}
	return 0;
}
EXPORT_SYMBOL_GPL(dvb_create_media_graph);
#endif

static int dvbdev_check_free_adapter_num(int num)
{
	struct list_head *entry;
	list_for_each(entry, &dvb_adapter_list) {
		struct dvb_adapter *adap;
		adap = list_entry(entry, struct dvb_adapter, list_head);
		if (adap->num == num)
			return 0;
	}
	return 1;
}

static int dvbdev_get_free_adapter_num (void)
{
	int num = 0;

	while (num < DVB_MAX_ADAPTERS) {
		if (dvbdev_check_free_adapter_num(num))
			return num;
		num++;
	}

	return -ENFILE;
}


int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
			 struct module *module, struct device *device,
			 short *adapter_nums)
{
	int i, num;

	mutex_lock(&dvbdev_register_lock);

	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
		num = adapter_nums[i];
		if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
		/* use the one the driver asked for */
			if (dvbdev_check_free_adapter_num(num))
				break;
		} else {
			num = dvbdev_get_free_adapter_num();
			break;
		}
		num = -1;
	}

	if (num < 0) {
		mutex_unlock(&dvbdev_register_lock);
		return -ENFILE;
	}

	memset (adap, 0, sizeof(struct dvb_adapter));
	INIT_LIST_HEAD (&adap->device_list);

	pr_info("DVB: registering new adapter (%s)\n", name);

	adap->num = num;
	adap->name = name;
	adap->module = module;
	adap->device = device;
	adap->mfe_shared = 0;
	adap->mfe_dvbdev = NULL;
	mutex_init (&adap->mfe_lock);

	list_add_tail (&adap->list_head, &dvb_adapter_list);

	mutex_unlock(&dvbdev_register_lock);

	return num;
}
EXPORT_SYMBOL(dvb_register_adapter);


int dvb_unregister_adapter(struct dvb_adapter *adap)
{
	mutex_lock(&dvbdev_register_lock);
	list_del (&adap->list_head);
	mutex_unlock(&dvbdev_register_lock);
	return 0;
}
EXPORT_SYMBOL(dvb_unregister_adapter);

/* if the miracle happens and "generic_usercopy()" is included into
   the kernel, then this can vanish. please don't make the mistake and
   define this as video_usercopy(). this will introduce a dependecy
   to the v4l "videodev.o" module, which is unnecessary for some
   cards (ie. the budget dvb-cards don't need the v4l module...) */
int dvb_usercopy(struct file *file,
		     unsigned int cmd, unsigned long arg,
		     int (*func)(struct file *file,
		     unsigned int cmd, void *arg))
{
	char    sbuf[128];
	void    *mbuf = NULL;
	void    *parg = NULL;
	int     err  = -EINVAL;

	/*  Copy arguments into temp kernel buffer  */
	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:
		/*
		 * For this command, the pointer is actually an integer
		 * argument.
		 */
		parg = (void *) arg;
		break;
	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	case _IOC_WRITE:
	case (_IOC_WRITE | _IOC_READ):
		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
			parg = sbuf;
		} else {
			/* too big to allocate from stack */
			mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
			if (NULL == mbuf)
				return -ENOMEM;
			parg = mbuf;
		}

		err = -EFAULT;
		if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
			goto out;
		break;
	}

	/* call driver */
	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
		err = -ENOTTY;

	if (err < 0)
		goto out;

	/*  Copy results into user buffer  */
	switch (_IOC_DIR(cmd))
	{
	case _IOC_READ:
	case (_IOC_WRITE | _IOC_READ):
		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
			err = -EFAULT;
		break;
	}

out:
	kfree(mbuf);
	return err;
}

static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct dvb_device *dvbdev = dev_get_drvdata(dev);

	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
	return 0;
}

static char *dvb_devnode(struct device *dev, umode_t *mode)
{
	struct dvb_device *dvbdev = dev_get_drvdata(dev);

	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
		dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
}


static int __init init_dvbdev(void)
{
	int retval;
	dev_t dev = MKDEV(DVB_MAJOR, 0);

	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
		pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
		return retval;
	}

	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
		pr_err("dvb-core: unable register character device\n");
		goto error;
	}

	dvb_class = class_create(THIS_MODULE, "dvb");
	if (IS_ERR(dvb_class)) {
		retval = PTR_ERR(dvb_class);
		goto error;
	}
	dvb_class->dev_uevent = dvb_uevent;
	dvb_class->devnode = dvb_devnode;
	return 0;

error:
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	return retval;
}


static void __exit exit_dvbdev(void)
{
	class_destroy(dvb_class);
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
}

subsys_initcall(init_dvbdev);
module_exit(exit_dvbdev);

MODULE_DESCRIPTION("DVB Core Driver");
MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
MODULE_LICENSE("GPL");