summaryrefslogtreecommitdiffstats
path: root/include/media/v4l2-subdev.h
blob: 0f92ebd2d7101acf66ff8cc5e83f8524e573332a (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
/*
 *  V4L2 sub-device support header.
 *
 *  Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>
 *
 *  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.
 */

#ifndef _V4L2_SUBDEV_H
#define _V4L2_SUBDEV_H

#include <linux/types.h>
#include <linux/v4l2-subdev.h>
#include <media/media-entity.h>
#include <media/v4l2-async.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-mediabus.h>

/* generic v4l2_device notify callback notification values */
#define V4L2_SUBDEV_IR_RX_NOTIFY		_IOW('v', 0, u32)
#define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ	0x00000001
#define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED	0x00000002
#define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN	0x00000004
#define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN	0x00000008

#define V4L2_SUBDEV_IR_TX_NOTIFY		_IOW('v', 1, u32)
#define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ	0x00000001

#define	V4L2_DEVICE_NOTIFY_EVENT		_IOW('v', 2, struct v4l2_event)

struct v4l2_device;
struct v4l2_ctrl_handler;
struct v4l2_event;
struct v4l2_event_subscription;
struct v4l2_fh;
struct v4l2_subdev;
struct v4l2_subdev_fh;
struct tuner_setup;
struct v4l2_mbus_frame_desc;

/**
 * struct v4l2_decode_vbi_line - used to decode_vbi_line
 *
 * @is_second_field: Set to 0 for the first (odd) field;
 *	set to 1 for the second (even) field.
 * @p: Pointer to the sliced VBI data from the decoder. On exit, points to
 *	the start of the payload.
 * @line: Line number of the sliced VBI data (1-23)
 * @type: VBI service type (V4L2_SLICED_*). 0 if no service found
 */
struct v4l2_decode_vbi_line {
	u32 is_second_field;
	u8 *p;
	u32 line;
	u32 type;
};

/*
 * Sub-devices are devices that are connected somehow to the main bridge
 * device. These devices are usually audio/video muxers/encoders/decoders or
 * sensors and webcam controllers.
 *
 * Usually these devices are controlled through an i2c bus, but other busses
 * may also be used.
 *
 * The v4l2_subdev struct provides a way of accessing these devices in a
 * generic manner. Most operations that these sub-devices support fall in
 * a few categories: core ops, audio ops, video ops and tuner ops.
 *
 * More categories can be added if needed, although this should remain a
 * limited set (no more than approx. 8 categories).
 *
 * Each category has its own set of ops that subdev drivers can implement.
 *
 * A subdev driver can leave the pointer to the category ops NULL if
 * it does not implement them (e.g. an audio subdev will generally not
 * implement the video category ops). The exception is the core category:
 * this must always be present.
 *
 * These ops are all used internally so it is no problem to change, remove
 * or add ops or move ops from one to another category. Currently these
 * ops are based on the original ioctls, but since ops are not limited to
 * one argument there is room for improvement here once all i2c subdev
 * drivers are converted to use these ops.
 */

/*
 * Core ops: it is highly recommended to implement at least these ops:
 *
 * log_status
 * g_register
 * s_register
 *
 * This provides basic debugging support.
 *
 * The ioctl ops is meant for generic ioctl-like commands. Depending on
 * the use-case it might be better to use subdev-specific ops (currently
 * not yet implemented) since ops provide proper type-checking.
 */

/* Subdevice external IO pin configuration */
#define V4L2_SUBDEV_IO_PIN_DISABLE	(1 << 0) /* ENABLE assumed */
#define V4L2_SUBDEV_IO_PIN_OUTPUT	(1 << 1)
#define V4L2_SUBDEV_IO_PIN_INPUT	(1 << 2)
#define V4L2_SUBDEV_IO_PIN_SET_VALUE	(1 << 3) /* Set output value */
#define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW	(1 << 4) /* ACTIVE HIGH assumed */

/**
 * struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
 *
 * @flags: bitmask with flags for this pin's config:
 *	   %V4L2_SUBDEV_IO_PIN_DISABLE - disables a pin config,
 *	   %V4L2_SUBDEV_IO_PIN_OUTPUT - if pin is an output,
 *	   %V4L2_SUBDEV_IO_PIN_INPUT - if pin is an input,
 *	   %V4L2_SUBDEV_IO_PIN_SET_VALUE - to set the output value via @value
 *	   and %V4L2_SUBDEV_IO_PIN_ACTIVE_LOW - if active is 0.
 * @pin: Chip external IO pin to configure
 * @function: Internal signal pad/function to route to IO pin
 * @value: Initial value for pin - e.g. GPIO output value
 * @strength: Pin drive strength
 */
struct v4l2_subdev_io_pin_config {
	u32 flags;
	u8 pin;
	u8 function;
	u8 value;
	u8 strength;
};

/**
 * struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
 *
 * @log_status: callback for %VIDIOC_LOG_STATUS ioctl handler code.
 *
 * @s_io_pin_config: configure one or more chip I/O pins for chips that
 *	multiplex different internal signal pads out to IO pins.  This function
 *	takes a pointer to an array of 'n' pin configuration entries, one for
 *	each pin being configured.  This function could be called at times
 *	other than just subdevice initialization.
 *
 * @init: initialize the sensor registers to some sort of reasonable default
 *	values. Do not use for new drivers and should be removed in existing
 *	drivers.
 *
 * @load_fw: load firmware.
 *
 * @reset: generic reset command. The argument selects which subsystems to
 *	reset. Passing 0 will always reset the whole chip. Do not use for new
 *	drivers without discussing this first on the linux-media mailinglist.
 *	There should be no reason normally to reset a device.
 *
 * @s_gpio: set GPIO pins. Very simple right now, might need to be extended with
 *	a direction argument if needed.
 *
 * @ioctl: called at the end of ioctl() syscall handler at the V4L2 core.
 *	   used to provide support for private ioctls used on the driver.
 *
 * @compat_ioctl32: called when a 32 bits application uses a 64 bits Kernel,
 *		    in order to fix data passed from/to userspace.
 *
 * @g_register: callback for %VIDIOC_G_REGISTER ioctl handler code.
 *
 * @s_register: callback for %VIDIOC_G_REGISTER ioctl handler code.
 *
 * @s_power: puts subdevice in power saving mode (on == 0) or normal operation
 *	mode (on == 1).
 *
 * @interrupt_service_routine: Called by the bridge chip's interrupt service
 *	handler, when an interrupt status has be raised due to this subdev,
 *	so that this subdev can handle the details.  It may schedule work to be
 *	performed later.  It must not sleep. **Called from an IRQ context**.
 *
 * @subscribe_event: used by the drivers to request the control framework that
 *		     for it to be warned when the value of a control changes.
 *
 * @unsubscribe_event: remove event subscription from the control framework.
 */
struct v4l2_subdev_core_ops {
	int (*log_status)(struct v4l2_subdev *sd);
	int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
				      struct v4l2_subdev_io_pin_config *pincfg);
	int (*init)(struct v4l2_subdev *sd, u32 val);
	int (*load_fw)(struct v4l2_subdev *sd);
	int (*reset)(struct v4l2_subdev *sd, u32 val);
	int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
	long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
#ifdef CONFIG_COMPAT
	long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
			       unsigned long arg);
#endif
#ifdef CONFIG_VIDEO_ADV_DEBUG
	int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
	int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
#endif
	int (*s_power)(struct v4l2_subdev *sd, int on);
	int (*interrupt_service_routine)(struct v4l2_subdev *sd,
						u32 status, bool *handled);
	int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
			       struct v4l2_event_subscription *sub);
	int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
				 struct v4l2_event_subscription *sub);
};

/**
 * struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
 *	in radio mode.
 *
 * @s_radio: callback for %VIDIOC_S_RADIO ioctl handler code.
 *
 * @s_frequency: callback for %VIDIOC_S_FREQUENCY ioctl handler code.
 *
 * @g_frequency: callback for %VIDIOC_G_FREQUENCY ioctl handler code.
 *		 freq->type must be filled in. Normally done by video_ioctl2()
 *		 or the bridge driver.
 *
 * @enum_freq_bands: callback for %VIDIOC_ENUM_FREQ_BANDS ioctl handler code.
 *
 * @g_tuner: callback for %VIDIOC_G_TUNER ioctl handler code.
 *
 * @s_tuner: callback for %VIDIOC_S_TUNER ioctl handler code. @vt->type must be
 *	     filled in. Normally done by video_ioctl2 or the
 *	     bridge driver.
 *
 * @g_modulator: callback for %VIDIOC_G_MODULATOR ioctl handler code.
 *
 * @s_modulator: callback for %VIDIOC_S_MODULATOR ioctl handler code.
 *
 * @s_type_addr: sets tuner type and its I2C addr.
 *
 * @s_config: sets tda9887 specific stuff, like port1, port2 and qss
 */
struct v4l2_subdev_tuner_ops {
	int (*s_radio)(struct v4l2_subdev *sd);
	int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
	int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
	int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
	int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
	int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
	int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
	int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
	int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
	int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
};

/**
 * struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
 *
 * @s_clock_freq: set the frequency (in Hz) of the audio clock output.
 *	Used to slave an audio processor to the video decoder, ensuring that
 *	audio and video remain synchronized. Usual values for the frequency
 *	are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
 *	-EINVAL is returned.
 *
 * @s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
 *	way to select I2S clock used by driving digital audio streams at some
 *	board designs. Usual values for the frequency are 1024000 and 2048000.
 *	If the frequency is not supported, then %-EINVAL is returned.
 *
 * @s_routing: used to define the input and/or output pins of an audio chip,
 *	and any additional configuration data.
 *	Never attempt to use user-level input IDs (e.g. Composite, S-Video,
 *	Tuner) at this level. An i2c device shouldn't know about whether an
 *	input pin is connected to a Composite connector, become on another
 *	board or platform it might be connected to something else entirely.
 *	The calling driver is responsible for mapping a user-level input to
 *	the right pins on the i2c device.
 *
 * @s_stream: used to notify the audio code that stream will start or has
 *	stopped.
 */
struct v4l2_subdev_audio_ops {
	int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
	int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
	int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
	int (*s_stream)(struct v4l2_subdev *sd, int enable);
};

/* Indicates the @length field specifies maximum data length. */
#define V4L2_MBUS_FRAME_DESC_FL_LEN_MAX		(1U << 0)
/*
 * Indicates that the format does not have line offsets, i.e. the
 * receiver should use 1D DMA.
 */
#define V4L2_MBUS_FRAME_DESC_FL_BLOB		(1U << 1)

/**
 * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
 *
 * @flags: bitmask flags: %V4L2_MBUS_FRAME_DESC_FL_LEN_MAX and
 *			  %V4L2_MBUS_FRAME_DESC_FL_BLOB.
 * @pixelcode: media bus pixel code, valid if FRAME_DESC_FL_BLOB is not set
 * @length: number of octets per frame, valid if V4L2_MBUS_FRAME_DESC_FL_BLOB
 *	    is set
 */
struct v4l2_mbus_frame_desc_entry {
	u16 flags;
	u32 pixelcode;
	u32 length;
};

#define V4L2_FRAME_DESC_ENTRY_MAX	4

/**
 * struct v4l2_mbus_frame_desc - media bus data frame description
 * @entry: frame descriptors array
 * @num_entries: number of entries in @entry array
 */
struct v4l2_mbus_frame_desc {
	struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
	unsigned short num_entries;
};

/**
 * struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
 *				  in video mode.
 *
 * @s_routing: see s_routing in audio_ops, except this version is for video
 *	devices.
 *
 * @s_crystal_freq: sets the frequency of the crystal used to generate the
 *	clocks in Hz. An extra flags field allows device specific configuration
 *	regarding clock frequency dividers, etc. If not used, then set flags
 *	to 0. If the frequency is not supported, then -EINVAL is returned.
 *
 * @g_std: callback for %VIDIOC_G_STD ioctl handler code.
 *
 * @s_std: callback for %VIDIOC_S_STD ioctl handler code.
 *
 * @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
 *	video input devices.
 *
 * @g_std_output: get current standard for video OUTPUT devices. This is ignored
 *	by video input devices.
 *
 * @querystd: callback for %VIDIOC_QUERYSTD ioctl handler code.
 *
 * @g_tvnorms: get &v4l2_std_id with all standards supported by the video
 *	CAPTURE device. This is ignored by video output devices.
 *
 * @g_tvnorms_output: get v4l2_std_id with all standards supported by the video
 *	OUTPUT device. This is ignored by video capture devices.
 *
 * @g_input_status: get input status. Same as the status field in the
 *	&struct &v4l2_input
 *
 * @s_stream: used to notify the driver that a video stream will start or has
 *	stopped.
 *
 * @g_pixelaspect: callback to return the pixelaspect ratio.
 *
 * @g_parm: callback for %VIDIOC_G_PARM ioctl handler code.
 *
 * @s_parm: callback for %VIDIOC_S_PARM ioctl handler code.
 *
 * @g_frame_interval: callback for %VIDIOC_G_FRAMEINTERVAL ioctl handler code.
 *
 * @s_frame_interval: callback for %VIDIOC_S_FRAMEINTERVAL ioctl handler code.
 *
 * @s_dv_timings: Set custom dv timings in the sub device. This is used
 *	when sub device is capable of setting detailed timing information
 *	in the hardware to generate/detect the video signal.
 *
 * @g_dv_timings: Get custom dv timings in the sub device.
 *
 * @query_dv_timings: callback for %VIDIOC_QUERY_DV_TIMINGS ioctl handler code.
 *
 * @g_mbus_config: get supported mediabus configurations
 *
 * @s_mbus_config: set a certain mediabus configuration. This operation is added
 *	for compatibility with soc-camera drivers and should not be used by new
 *	software.
 *
 * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
 *	can adjust @size to a lower value and must not write more data to the
 *	buffer starting at @data than the original value of @size.
 */
struct v4l2_subdev_video_ops {
	int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
	int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
	int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
	int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
	int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
	int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
	int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
	int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
	int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
	int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
	int (*s_stream)(struct v4l2_subdev *sd, int enable);
	int (*g_pixelaspect)(struct v4l2_subdev *sd, struct v4l2_fract *aspect);
	int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
	int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
	int (*g_frame_interval)(struct v4l2_subdev *sd,
				struct v4l2_subdev_frame_interval *interval);
	int (*s_frame_interval)(struct v4l2_subdev *sd,
				struct v4l2_subdev_frame_interval *interval);
	int (*s_dv_timings)(struct v4l2_subdev *sd,
			struct v4l2_dv_timings *timings);
	int (*g_dv_timings)(struct v4l2_subdev *sd,
			struct v4l2_dv_timings *timings);
	int (*query_dv_timings)(struct v4l2_subdev *sd,
			struct v4l2_dv_timings *timings);
	int (*g_mbus_config)(struct v4l2_subdev *sd,
			     struct v4l2_mbus_config *cfg);
	int (*s_mbus_config)(struct v4l2_subdev *sd,
			     const struct v4l2_mbus_config *cfg);
	int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
			   unsigned int *size);
};

/**
 * struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
 *				  in video mode via the vbi device node.
 *
 *  @decode_vbi_line: video decoders that support sliced VBI need to implement
 *	this ioctl. Field p of the &struct v4l2_decode_vbi_line is set to the
 *	start of the VBI data that was generated by the decoder. The driver
 *	then parses the sliced VBI data and sets the other fields in the
 *	struct accordingly. The pointer p is updated to point to the start of
 *	the payload which can be copied verbatim into the data field of the
 *	&struct v4l2_sliced_vbi_data. If no valid VBI data was found, then the
 *	type field is set to 0 on return.
 *
 * @s_vbi_data: used to generate VBI signals on a video signal.
 *	&struct v4l2_sliced_vbi_data is filled with the data packets that
 *	should be output. Note that if you set the line field to 0, then that
 *	VBI signal is disabled. If no valid VBI data was found, then the type
 *	field is set to 0 on return.
 *
 * @g_vbi_data: used to obtain the sliced VBI packet from a readback register.
 *	Not all video decoders support this. If no data is available because
 *	the readback register contains invalid or erroneous data %-EIO is
 *	returned. Note that you must fill in the 'id' member and the 'field'
 *	member (to determine whether CC data from the first or second field
 *	should be obtained).
 *
 * @g_sliced_vbi_cap: callback for %VIDIOC_SLICED_VBI_CAP ioctl handler code.
 *
 * @s_raw_fmt: setup the video encoder/decoder for raw VBI.
 *
 * @g_sliced_fmt: retrieve the current sliced VBI settings.
 *
 * @s_sliced_fmt: setup the sliced VBI settings.
 */
struct v4l2_subdev_vbi_ops {
	int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
	int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
	int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
	int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
	int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
	int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
	int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
};

/**
 * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
 * @g_skip_top_lines: number of lines at the top of the image to be skipped.
 *		      This is needed for some sensors, which always corrupt
 *		      several top lines of the output image, or which send their
 *		      metadata in them.
 * @g_skip_frames: number of frames to skip at stream start. This is needed for
 *		   buggy sensors that generate faulty frames when they are
 *		   turned on.
 */
struct v4l2_subdev_sensor_ops {
	int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
	int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
};

/**
 * enum v4l2_subdev_ir_mode- describes the type of IR supported
 *
 * @V4L2_SUBDEV_IR_MODE_PULSE_WIDTH: IR uses struct ir_raw_event records
 */
enum v4l2_subdev_ir_mode {
	V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
};

/**
 * struct v4l2_subdev_ir_parameters - Parameters for IR TX or TX
 *
 * @bytes_per_data_element: bytes per data element of data in read or
 *	write call.
 * @mode: IR mode as defined by &enum v4l2_subdev_ir_mode.
 * @enable: device is active if true
 * @interrupt_enable: IR interrupts are enabled if true
 * @shutdown: if true: set hardware to low/no power, false: normal mode
 *
 * @modulation: if true, it uses carrier, if false: baseband
 * @max_pulse_width:  maximum pulse width in ns, valid only for baseband signal
 * @carrier_freq: carrier frequency in Hz, valid only for modulated signal
 * @duty_cycle: duty cycle percentage, valid only for modulated signal
 * @invert_level: invert signal level
 *
 * @invert_carrier_sense: Send 0/space as a carrier burst. used only in TX.
 *
 * @noise_filter_min_width: min time of a valid pulse, in ns. Used only for RX.
 * @carrier_range_lower: Lower carrier range, in Hz, valid only for modulated
 *	signal. Used only for RX.
 * @carrier_range_upper: Upper carrier range, in Hz, valid only for modulated
 *	signal. Used only for RX.
 * @resolution: The receive resolution, in ns . Used only for RX.
 */
struct v4l2_subdev_ir_parameters {
	unsigned int bytes_per_data_element;
	enum v4l2_subdev_ir_mode mode;

	bool enable;
	bool interrupt_enable;
	bool shutdown;

	bool modulation;
	u32 max_pulse_width;
	unsigned int carrier_freq;
	unsigned int duty_cycle;
	bool invert_level;

	/* Tx only */
	bool invert_carrier_sense;

	/* Rx only */
	u32 noise_filter_min_width;
	unsigned int carrier_range_lower;
	unsigned int carrier_range_upper;
	u32 resolution;
};

/**
 * struct v4l2_subdev_ir_ops - operations for IR subdevices
 *
 * @rx_read: Reads received codes or pulse width data.
 *	The semantics are similar to a non-blocking read() call.
 * @rx_g_parameters: Get the current operating parameters and state of the
 *	the IR receiver.
 * @rx_s_parameters: Set the current operating parameters and state of the
 *	the IR receiver.  It is recommended to call
 *	[rt]x_g_parameters first to fill out the current state, and only change
 *	the fields that need to be changed.  Upon return, the actual device
 *	operating parameters and state will be returned.  Note that hardware
 *	limitations may prevent the actual settings from matching the requested
 *	settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 *	was requested.  An exception is when the shutdown parameter is true.
 *	The last used operational parameters will be returned, but the actual
 *	state of the hardware be different to minimize power consumption and
 *	processing when shutdown is true.
 *
 * @tx_write: Writes codes or pulse width data for transmission.
 *	The semantics are similar to a non-blocking write() call.
 * @tx_g_parameters: Get the current operating parameters and state of the
 *	the IR transmitter.
 * @tx_s_parameters: Set the current operating parameters and state of the
 *	the IR transmitter.  It is recommended to call
 *	[rt]x_g_parameters first to fill out the current state, and only change
 *	the fields that need to be changed.  Upon return, the actual device
 *	operating parameters and state will be returned.  Note that hardware
 *	limitations may prevent the actual settings from matching the requested
 *	settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 *	was requested.  An exception is when the shutdown parameter is true.
 *	The last used operational parameters will be returned, but the actual
 *	state of the hardware be different to minimize power consumption and
 *	processing when shutdown is true.
 */
struct v4l2_subdev_ir_ops {
	/* Receiver */
	int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
				ssize_t *num);

	int (*rx_g_parameters)(struct v4l2_subdev *sd,
				struct v4l2_subdev_ir_parameters *params);
	int (*rx_s_parameters)(struct v4l2_subdev *sd,
				struct v4l2_subdev_ir_parameters *params);

	/* Transmitter */
	int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
				ssize_t *num);

	int (*tx_g_parameters)(struct v4l2_subdev *sd,
				struct v4l2_subdev_ir_parameters *params);
	int (*tx_s_parameters)(struct v4l2_subdev *sd,
				struct v4l2_subdev_ir_parameters *params);
};

/**
 * struct v4l2_subdev_pad_config - Used for storing subdev pad information.
 *
 * @try_fmt: &struct v4l2_mbus_framefmt
 * @try_crop: &struct v4l2_rect to be used for crop
 * @try_compose: &struct v4l2_rect to be used for compose
 *
 * This structure only needs to be passed to the pad op if the 'which' field
 * of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
 * %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
 */
struct v4l2_subdev_pad_config {
	struct v4l2_mbus_framefmt try_fmt;
	struct v4l2_rect try_crop;
	struct v4l2_rect try_compose;
};

/**
 * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
 *
 * @init_cfg: initialize the pad config to default values
 * @enum_mbus_code: callback for %VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler
 *		    code.
 * @enum_frame_size: callback for %VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler
 *		     code.
 *
 * @enum_frame_interval: callback for %VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL ioctl
 *			 handler code.
 *
 * @get_fmt: callback for %VIDIOC_SUBDEV_G_FMT ioctl handler code.
 *
 * @set_fmt: callback for %VIDIOC_SUBDEV_S_FMT ioctl handler code.
 *
 * @get_selection: callback for %VIDIOC_SUBDEV_G_SELECTION ioctl handler code.
 *
 * @set_selection: callback for %VIDIOC_SUBDEV_S_SELECTION ioctl handler code.
 *
 * @get_edid: callback for %VIDIOC_SUBDEV_G_EDID ioctl handler code.
 *
 * @set_edid: callback for %VIDIOC_SUBDEV_S_EDID ioctl handler code.
 *
 * @dv_timings_cap: callback for %VIDIOC_SUBDEV_DV_TIMINGS_CAP ioctl handler
 *		    code.
 *
 * @enum_dv_timings: callback for %VIDIOC_SUBDEV_ENUM_DV_TIMINGS ioctl handler
 *		     code.
 *
 * @link_validate: used by the media controller code to check if the links
 *		   that belongs to a pipeline can be used for stream.
 *
 * @get_frame_desc: get the current low level media bus frame parameters.
 *
 * @set_frame_desc: set the low level media bus frame parameters, @fd array
 *                  may be adjusted by the subdev driver to device capabilities.
 */
struct v4l2_subdev_pad_ops {
	int (*init_cfg)(struct v4l2_subdev *sd,
			struct v4l2_subdev_pad_config *cfg);
	int (*enum_mbus_code)(struct v4l2_subdev *sd,
			      struct v4l2_subdev_pad_config *cfg,
			      struct v4l2_subdev_mbus_code_enum *code);
	int (*enum_frame_size)(struct v4l2_subdev *sd,
			       struct v4l2_subdev_pad_config *cfg,
			       struct v4l2_subdev_frame_size_enum *fse);
	int (*enum_frame_interval)(struct v4l2_subdev *sd,
				   struct v4l2_subdev_pad_config *cfg,
				   struct v4l2_subdev_frame_interval_enum *fie);
	int (*get_fmt)(struct v4l2_subdev *sd,
		       struct v4l2_subdev_pad_config *cfg,
		       struct v4l2_subdev_format *format);
	int (*set_fmt)(struct v4l2_subdev *sd,
		       struct v4l2_subdev_pad_config *cfg,
		       struct v4l2_subdev_format *format);
	int (*get_selection)(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_selection *sel);
	int (*set_selection)(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_selection *sel);
	int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
	int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
	int (*dv_timings_cap)(struct v4l2_subdev *sd,
			      struct v4l2_dv_timings_cap *cap);
	int (*enum_dv_timings)(struct v4l2_subdev *sd,
			       struct v4l2_enum_dv_timings *timings);
#ifdef CONFIG_MEDIA_CONTROLLER
	int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
			     struct v4l2_subdev_format *source_fmt,
			     struct v4l2_subdev_format *sink_fmt);
#endif /* CONFIG_MEDIA_CONTROLLER */
	int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
			      struct v4l2_mbus_frame_desc *fd);
	int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
			      struct v4l2_mbus_frame_desc *fd);
};

/**
 * struct v4l2_subdev_ops - Subdev operations
 *
 * @core: pointer to &struct v4l2_subdev_core_ops. Can be %NULL
 * @tuner: pointer to &struct v4l2_subdev_tuner_ops. Can be %NULL
 * @audio: pointer to &struct v4l2_subdev_audio_ops. Can be %NULL
 * @video: pointer to &struct v4l2_subdev_video_ops. Can be %NULL
 * @vbi: pointer to &struct v4l2_subdev_vbi_ops. Can be %NULL
 * @ir: pointer to &struct v4l2_subdev_ir_ops. Can be %NULL
 * @sensor: pointer to &struct v4l2_subdev_sensor_ops. Can be %NULL
 * @pad: pointer to &struct v4l2_subdev_pad_ops. Can be %NULL
 */
struct v4l2_subdev_ops {
	const struct v4l2_subdev_core_ops	*core;
	const struct v4l2_subdev_tuner_ops	*tuner;
	const struct v4l2_subdev_audio_ops	*audio;
	const struct v4l2_subdev_video_ops	*video;
	const struct v4l2_subdev_vbi_ops	*vbi;
	const struct v4l2_subdev_ir_ops		*ir;
	const struct v4l2_subdev_sensor_ops	*sensor;
	const struct v4l2_subdev_pad_ops	*pad;
};

/**
 * struct v4l2_subdev_internal_ops - V4L2 subdev internal ops
 *
 * @registered: called when this subdev is registered. When called the v4l2_dev
 *	field is set to the correct v4l2_device.
 *
 * @unregistered: called when this subdev is unregistered. When called the
 *	v4l2_dev field is still set to the correct v4l2_device.
 *
 * @open: called when the subdev device node is opened by an application.
 *
 * @close: called when the subdev device node is closed.
 *
 * .. note::
 *	Never call this from drivers, only the v4l2 framework can call
 *	these ops.
 */
struct v4l2_subdev_internal_ops {
	int (*registered)(struct v4l2_subdev *sd);
	void (*unregistered)(struct v4l2_subdev *sd);
	int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
	int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
};

#define V4L2_SUBDEV_NAME_SIZE 32

/* Set this flag if this subdev is a i2c device. */
#define V4L2_SUBDEV_FL_IS_I2C			(1U << 0)
/* Set this flag if this subdev is a spi device. */
#define V4L2_SUBDEV_FL_IS_SPI			(1U << 1)
/* Set this flag if this subdev needs a device node. */
#define V4L2_SUBDEV_FL_HAS_DEVNODE		(1U << 2)
/* Set this flag if this subdev generates events. */
#define V4L2_SUBDEV_FL_HAS_EVENTS		(1U << 3)

struct regulator_bulk_data;

/**
 * struct v4l2_subdev_platform_data - regulators config struct
 *
 * @regulators: Optional regulators used to power on/off the subdevice
 * @num_regulators: Number of regululators
 * @host_priv: Per-subdevice data, specific for a certain video host device
 */
struct v4l2_subdev_platform_data {
	struct regulator_bulk_data *regulators;
	int num_regulators;

	void *host_priv;
};

/**
 * struct v4l2_subdev - describes a V4L2 sub-device
 *
 * @entity: pointer to &struct media_entity
 * @list: List of sub-devices
 * @owner: The owner is the same as the driver's &struct device owner.
 * @owner_v4l2_dev: true if the &sd->owner matches the owner of @v4l2_dev->dev
 *	ownner. Initialized by v4l2_device_register_subdev().
 * @flags: subdev flags. Can be:
 *   %V4L2_SUBDEV_FL_IS_I2C - Set this flag if this subdev is a i2c device;
 *   %V4L2_SUBDEV_FL_IS_SPI - Set this flag if this subdev is a spi device;
 *   %V4L2_SUBDEV_FL_HAS_DEVNODE - Set this flag if this subdev needs a
 *   device node;
 *   %V4L2_SUBDEV_FL_HAS_EVENTS -  Set this flag if this subdev generates
 *   events.
 *
 * @v4l2_dev: pointer to struct &v4l2_device
 * @ops: pointer to struct &v4l2_subdev_ops
 * @internal_ops: pointer to struct &v4l2_subdev_internal_ops.
 *	Never call these internal ops from within a driver!
 * @ctrl_handler: The control handler of this subdev. May be NULL.
 * @name: Name of the sub-device. Please notice that the name must be unique.
 * @grp_id: can be used to group similar subdevs. Value is driver-specific
 * @dev_priv: pointer to private data
 * @host_priv: pointer to private data used by the device where the subdev
 *	is attached.
 * @devnode: subdev device node
 * @dev: pointer to the physical device, if any
 * @fwnode: The fwnode_handle of the subdev, usually the same as
 *	    either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
 * @async_list: Links this subdev to a global subdev_list or @notifier->done
 *	list.
 * @asd: Pointer to respective &struct v4l2_async_subdev.
 * @notifier: Pointer to the managing notifier.
 * @pdata: common part of subdevice platform data
 *
 * Each instance of a subdev driver should create this struct, either
 * stand-alone or embedded in a larger struct.
 *
 * This structure should be initialized by v4l2_subdev_init() or one of
 * its variants: v4l2_spi_subdev_init(), v4l2_i2c_subdev_init().
 */
struct v4l2_subdev {
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity entity;
#endif
	struct list_head list;
	struct module *owner;
	bool owner_v4l2_dev;
	u32 flags;
	struct v4l2_device *v4l2_dev;
	const struct v4l2_subdev_ops *ops;
	const struct v4l2_subdev_internal_ops *internal_ops;
	struct v4l2_ctrl_handler *ctrl_handler;
	char name[V4L2_SUBDEV_NAME_SIZE];
	u32 grp_id;
	void *dev_priv;
	void *host_priv;
	struct video_device *devnode;
	struct device *dev;
	struct fwnode_handle *fwnode;
	struct list_head async_list;
	struct v4l2_async_subdev *asd;
	struct v4l2_async_notifier *notifier;
	struct v4l2_subdev_platform_data *pdata;
};

#define media_entity_to_v4l2_subdev(ent)				\
({									\
	typeof(ent) __me_sd_ent = (ent);				\
									\
	__me_sd_ent ?							\
		container_of(__me_sd_ent, struct v4l2_subdev, entity) :	\
		NULL;							\
})

#define vdev_to_v4l2_subdev(vdev) \
	((struct v4l2_subdev *)video_get_drvdata(vdev))

/**
 * struct v4l2_subdev_fh - Used for storing subdev information per file handle
 *
 * @vfh: pointer to struct v4l2_fh
 * @pad: pointer to v4l2_subdev_pad_config
 */
struct v4l2_subdev_fh {
	struct v4l2_fh vfh;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	struct v4l2_subdev_pad_config *pad;
#endif
};

#define to_v4l2_subdev_fh(fh)	\
	container_of(fh, struct v4l2_subdev_fh, vfh)

#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
#define __V4L2_SUBDEV_MK_GET_TRY(rtype, fun_name, field_name)		\
	static inline struct rtype *					\
	fun_name(struct v4l2_subdev *sd,				\
		 struct v4l2_subdev_pad_config *cfg,			\
		 unsigned int pad)					\
	{								\
		BUG_ON(pad >= sd->entity.num_pads);			\
		return &cfg[pad].field_name;				\
	}

__V4L2_SUBDEV_MK_GET_TRY(v4l2_mbus_framefmt, v4l2_subdev_get_try_format, try_fmt)
__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_crop, try_crop)
__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_compose, try_compose)
#endif

extern const struct v4l2_file_operations v4l2_subdev_fops;

/**
 * v4l2_set_subdevdata - Sets V4L2 dev private device data
 *
 * @sd: pointer to &struct v4l2_subdev
 * @p: pointer to the private device data to be stored.
 */
static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
{
	sd->dev_priv = p;
}

/**
 * v4l2_get_subdevdata - Gets V4L2 dev private device data
 *
 * @sd: pointer to &struct v4l2_subdev
 *
 * Returns the pointer to the private device data to be stored.
 */
static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
{
	return sd->dev_priv;
}

/**
 * v4l2_set_subdev_hostdata - Sets V4L2 dev private host data
 *
 * @sd: pointer to &struct v4l2_subdev
 * @p: pointer to the private data to be stored.
 */
static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
{
	sd->host_priv = p;
}

/**
 * v4l2_get_subdev_hostdata - Gets V4L2 dev private data
 *
 * @sd: pointer to &struct v4l2_subdev
 *
 * Returns the pointer to the private host data to be stored.
 */
static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
{
	return sd->host_priv;
}

#ifdef CONFIG_MEDIA_CONTROLLER

/**
 * v4l2_subdev_link_validate_default - validates a media link
 *
 * @sd: pointer to &struct v4l2_subdev
 * @link: pointer to &struct media_link
 * @source_fmt: pointer to &struct v4l2_subdev_format
 * @sink_fmt: pointer to &struct v4l2_subdev_format
 *
 * This function ensures that width, height and the media bus pixel
 * code are equal on both source and sink of the link.
 */
int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
				      struct media_link *link,
				      struct v4l2_subdev_format *source_fmt,
				      struct v4l2_subdev_format *sink_fmt);

/**
 * v4l2_subdev_link_validate - validates a media link
 *
 * @link: pointer to &struct media_link
 *
 * This function calls the subdev's link_validate ops to validate
 * if a media link is valid for streaming. It also internally
 * calls v4l2_subdev_link_validate_default() to ensure that
 * width, height and the media bus pixel code are equal on both
 * source and sink of the link.
 */
int v4l2_subdev_link_validate(struct media_link *link);

/**
 * v4l2_subdev_alloc_pad_config - Allocates memory for pad config
 *
 * @sd: pointer to struct v4l2_subdev
 */
struct
v4l2_subdev_pad_config *v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);

/**
 * v4l2_subdev_free_pad_config - Frees memory allocated by
 *	v4l2_subdev_alloc_pad_config().
 *
 * @cfg: pointer to &struct v4l2_subdev_pad_config
 */
void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
#endif /* CONFIG_MEDIA_CONTROLLER */

/**
 * v4l2_subdev_init - initializes the sub-device struct
 *
 * @sd: pointer to the &struct v4l2_subdev to be initialized
 * @ops: pointer to &struct v4l2_subdev_ops.
 */
void v4l2_subdev_init(struct v4l2_subdev *sd,
		      const struct v4l2_subdev_ops *ops);

/*
 * Call an ops of a v4l2_subdev, doing the right checks against
 * NULL pointers.
 *
 * Example: err = v4l2_subdev_call(sd, video, s_std, norm);
 */
#define v4l2_subdev_call(sd, o, f, args...)				\
	(!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ?	\
		(sd)->ops->o->f((sd), ##args) : -ENOIOCTLCMD))

#define v4l2_subdev_has_op(sd, o, f) \
	((sd)->ops->o && (sd)->ops->o->f)

/**
 * v4l2_subdev_notify_event() - Delivers event notification for subdevice
 * @sd: The subdev for which to deliver the event
 * @ev: The event to deliver
 *
 * Will deliver the specified event to all userspace event listeners which are
 * subscribed to the v42l subdev event queue as well as to the bridge driver
 * using the notify callback. The notification type for the notify callback
 * will be %V4L2_DEVICE_NOTIFY_EVENT.
 */
void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
			      const struct v4l2_event *ev);

#endif