aboutsummaryrefslogtreecommitdiff
path: root/include/media/dvb_frontend.h
blob: 0b40886fd7d371088405eccef7a7aecd6aae2da3 (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
/*
 * dvb_frontend.h
 *
 * The Digital TV Frontend kABI defines a driver-internal interface for
 * registering low-level, hardware specific driver to a hardware independent
 * frontend layer.
 *
 * Copyright (C) 2001 convergence integrated media GmbH
 * Copyright (C) 2004 convergence GmbH
 *
 * Written by Ralph Metzler
 * Overhauled by Holger Waechtler
 * Kernel I2C stuff by Michael Hunold <hunold@convergence.de>
 *
 * 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.
 *

 * You should have received a copy of the GNU Lesser 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.
 *
 */

#ifndef _DVB_FRONTEND_H_
#define _DVB_FRONTEND_H_

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/ioctl.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include <linux/dvb/frontend.h>

#include <media/dvbdev.h>

/*
 * Maximum number of Delivery systems per frontend. It
 * should be smaller or equal to 32
 */
#define MAX_DELSYS	8

/**
 * struct dvb_frontend_tune_settings - parameters to adjust frontend tuning
 *
 * @min_delay_ms:	minimum delay for tuning, in ms
 * @step_size:		step size between two consecutive frequencies
 * @max_drift:		maximum drift
 *
 * NOTE: step_size is in Hz, for terrestrial/cable or kHz for satellite
 */
struct dvb_frontend_tune_settings {
	int min_delay_ms;
	int step_size;
	int max_drift;
};

struct dvb_frontend;

/**
 * struct dvb_tuner_info - Frontend name and min/max ranges/bandwidths
 *
 * @name:		name of the Frontend
 * @frequency_min:	minimal frequency supported
 * @frequency_max:	maximum frequency supported
 * @frequency_step:	frequency step
 * @bandwidth_min:	minimal frontend bandwidth supported
 * @bandwidth_max:	maximum frontend bandwidth supported
 * @bandwidth_step:	frontend bandwidth step
 *
 * NOTE: frequency parameters are in Hz, for terrestrial/cable or kHz for
 * satellite.
 */
struct dvb_tuner_info {
	char name[128];

	u32 frequency_min;
	u32 frequency_max;
	u32 frequency_step;

	u32 bandwidth_min;
	u32 bandwidth_max;
	u32 bandwidth_step;
};

/**
 * struct analog_parameters - Parameters to tune into an analog/radio channel
 *
 * @frequency:	Frequency used by analog TV tuner (either in 62.5 kHz step,
 * 		for TV, or 62.5 Hz for radio)
 * @mode:	Tuner mode, as defined on enum v4l2_tuner_type
 * @audmode:	Audio mode as defined for the rxsubchans field at videodev2.h,
 * 		e. g. V4L2_TUNER_MODE_*
 * @std:	TV standard bitmap as defined at videodev2.h, e. g. V4L2_STD_*
 *
 * Hybrid tuners should be supported by both V4L2 and DVB APIs. This
 * struct contains the data that are used by the V4L2 side. To avoid
 * dependencies from V4L2 headers, all enums here are declared as integers.
 */
struct analog_parameters {
	unsigned int frequency;
	unsigned int mode;
	unsigned int audmode;
	u64 std;
};

/**
 * enum dvbfe_algo - defines the algorithm used to tune into a channel
 *
 * @DVBFE_ALGO_HW: Hardware Algorithm -
 *	Devices that support this algorithm do everything in hardware
 *	and no software support is needed to handle them.
 *	Requesting these devices to LOCK is the only thing required,
 *	device is supposed to do everything in the hardware.
 *
 * @DVBFE_ALGO_SW: Software Algorithm -
 * These are dumb devices, that require software to do everything
 *
 * @DVBFE_ALGO_CUSTOM: Customizable Agorithm -
 *	Devices having this algorithm can be customized to have specific
 *	algorithms in the frontend driver, rather than simply doing a
 *	software zig-zag. In this case the zigzag maybe hardware assisted
 *	or it maybe completely done in hardware. In all cases, usage of
 *	this algorithm, in conjunction with the search and track
 *	callbacks, utilizes the driver specific algorithm.
 *
 * @DVBFE_ALGO_RECOVERY: Recovery Algorithm -
 *	These devices have AUTO recovery capabilities from LOCK failure
 */
enum dvbfe_algo {
	DVBFE_ALGO_HW			= (1 <<  0),
	DVBFE_ALGO_SW			= (1 <<  1),
	DVBFE_ALGO_CUSTOM		= (1 <<  2),
	DVBFE_ALGO_RECOVERY		= (1 << 31)
};

/**
 * enum dvbfe_search - search callback possible return status
 *
 * @DVBFE_ALGO_SEARCH_SUCCESS:
 *	The frontend search algorithm completed and returned successfully
 *
 * @DVBFE_ALGO_SEARCH_ASLEEP:
 *	The frontend search algorithm is sleeping
 *
 * @DVBFE_ALGO_SEARCH_FAILED:
 *	The frontend search for a signal failed
 *
 * @DVBFE_ALGO_SEARCH_INVALID:
 *	The frontend search algorith was probably supplied with invalid
 *	parameters and the search is an invalid one
 *
 * @DVBFE_ALGO_SEARCH_ERROR:
 *	The frontend search algorithm failed due to some error
 *
 * @DVBFE_ALGO_SEARCH_AGAIN:
 *	The frontend search algorithm was requested to search again
 */
enum dvbfe_search {
	DVBFE_ALGO_SEARCH_SUCCESS	= (1 <<  0),
	DVBFE_ALGO_SEARCH_ASLEEP	= (1 <<  1),
	DVBFE_ALGO_SEARCH_FAILED	= (1 <<  2),
	DVBFE_ALGO_SEARCH_INVALID	= (1 <<  3),
	DVBFE_ALGO_SEARCH_AGAIN		= (1 <<  4),
	DVBFE_ALGO_SEARCH_ERROR		= (1 << 31),
};

/**
 * struct dvb_tuner_ops - Tuner information and callbacks
 *
 * @info:		embedded &struct dvb_tuner_info with tuner properties
 * @release:		callback function called when frontend is detached.
 *			drivers should free any allocated memory.
 * @init:		callback function used to initialize the tuner device.
 * @sleep:		callback function used to put the tuner to sleep.
 * @suspend:		callback function used to inform that the Kernel will
 *			suspend.
 * @resume:		callback function used to inform that the Kernel is
 *			resuming from suspend.
 * @set_params:		callback function used to inform the tuner to tune
 *			into a digital TV channel. The properties to be used
 *			are stored at &struct dvb_frontend.dtv_property_cache.
 *			The tuner demod can change the parameters to reflect
 *			the changes needed for the channel to be tuned, and
 *			update statistics. This is the recommended way to set
 *			the tuner parameters and should be used on newer
 *			drivers.
 * @set_analog_params:	callback function used to tune into an analog TV
 *			channel on hybrid tuners. It passes @analog_parameters
 *			to the driver.
 * @set_config:		callback function used to send some tuner-specific
 *			parameters.
 * @get_frequency:	get the actual tuned frequency
 * @get_bandwidth:	get the bandwitdh used by the low pass filters
 * @get_if_frequency:	get the Intermediate Frequency, in Hz. For baseband,
 * 			should return 0.
 * @get_status:		returns the frontend lock status
 * @get_rf_strength:	returns the RF signal strength. Used mostly to support
 *			analog TV and radio. Digital TV should report, instead,
 *			via DVBv5 API (&struct dvb_frontend.dtv_property_cache).
 * @get_afc:		Used only by analog TV core. Reports the frequency
 *			drift due to AFC.
 * @calc_regs:		callback function used to pass register data settings
 *			for simple tuners.  Shouldn't be used on newer drivers.
 * @set_frequency:	Set a new frequency. Shouldn't be used on newer drivers.
 * @set_bandwidth:	Set a new frequency. Shouldn't be used on newer drivers.
 *
 * NOTE: frequencies used on @get_frequency and @set_frequency are in Hz for
 * terrestrial/cable or kHz for satellite.
 *
 */
struct dvb_tuner_ops {

	struct dvb_tuner_info info;

	void (*release)(struct dvb_frontend *fe);
	int (*init)(struct dvb_frontend *fe);
	int (*sleep)(struct dvb_frontend *fe);
	int (*suspend)(struct dvb_frontend *fe);
	int (*resume)(struct dvb_frontend *fe);

	/* This is the recomended way to set the tuner */
	int (*set_params)(struct dvb_frontend *fe);
	int (*set_analog_params)(struct dvb_frontend *fe, struct analog_parameters *p);

	int (*set_config)(struct dvb_frontend *fe, void *priv_cfg);

	int (*get_frequency)(struct dvb_frontend *fe, u32 *frequency);
	int (*get_bandwidth)(struct dvb_frontend *fe, u32 *bandwidth);
	int (*get_if_frequency)(struct dvb_frontend *fe, u32 *frequency);

#define TUNER_STATUS_LOCKED 1
#define TUNER_STATUS_STEREO 2
	int (*get_status)(struct dvb_frontend *fe, u32 *status);
	int (*get_rf_strength)(struct dvb_frontend *fe, u16 *strength);
	int (*get_afc)(struct dvb_frontend *fe, s32 *afc);

	/*
	 * This is support for demods like the mt352 - fills out the supplied
	 * buffer with what to write.
	 *
	 * Don't use on newer drivers.
	 */
	int (*calc_regs)(struct dvb_frontend *fe, u8 *buf, int buf_len);

	/*
	 * These are provided separately from set_params in order to
	 * facilitate silicon tuners which require sophisticated tuning loops,
	 * controlling each parameter separately.
	 *
	 * Don't use on newer drivers.
	 */
	int (*set_frequency)(struct dvb_frontend *fe, u32 frequency);
	int (*set_bandwidth)(struct dvb_frontend *fe, u32 bandwidth);
};

/**
 * struct analog_demod_info - Information struct for analog TV part of the demod
 *
 * @name:	Name of the analog TV demodulator
 */
struct analog_demod_info {
	char *name;
};

/**
 * struct analog_demod_ops  - Demodulation information and callbacks for
 *			      analog TV and radio
 *
 * @info:		pointer to struct analog_demod_info
 * @set_params:		callback function used to inform the demod to set the
 *			demodulator parameters needed to decode an analog or
 *			radio channel. The properties are passed via
 *			&struct analog_params.
 * @has_signal:		returns 0xffff if has signal, or 0 if it doesn't.
 * @get_afc:		Used only by analog TV core. Reports the frequency
 *			drift due to AFC.
 * @tuner_status:	callback function that returns tuner status bits, e. g.
 *			%TUNER_STATUS_LOCKED and %TUNER_STATUS_STEREO.
 * @standby:		set the tuner to standby mode.
 * @release:		callback function called when frontend is detached.
 *			drivers should free any allocated memory.
 * @i2c_gate_ctrl:	controls the I2C gate. Newer drivers should use I2C
 *			mux support instead.
 * @set_config:		callback function used to send some tuner-specific
 *			parameters.
 */
struct analog_demod_ops {

	struct analog_demod_info info;

	void (*set_params)(struct dvb_frontend *fe,
			   struct analog_parameters *params);
	int  (*has_signal)(struct dvb_frontend *fe, u16 *signal);
	int  (*get_afc)(struct dvb_frontend *fe, s32 *afc);
	void (*tuner_status)(struct dvb_frontend *fe);
	void (*standby)(struct dvb_frontend *fe);
	void (*release)(struct dvb_frontend *fe);
	int  (*i2c_gate_ctrl)(struct dvb_frontend *fe, int enable);

	/** This is to allow setting tuner-specific configuration */
	int (*set_config)(struct dvb_frontend *fe, void *priv_cfg);
};

struct dtv_frontend_properties;


/**
 * struct dvb_frontend_ops - Demodulation information and callbacks for
 *			      ditialt TV
 *
 * @info:		embedded &struct dvb_tuner_info with tuner properties
 * @delsys:		Delivery systems supported by the frontend
 * @detach:		callback function called when frontend is detached.
 *			drivers should clean up, but not yet free the &struct
 *			dvb_frontend allocation.
 * @release:		callback function called when frontend is ready to be
 *			freed.
 *			drivers should free any allocated memory.
 * @release_sec:	callback function requesting that the Satelite Equipment
 *			Control (SEC) driver to release and free any memory
 *			allocated by the driver.
 * @init:		callback function used to initialize the tuner device.
 * @sleep:		callback function used to put the tuner to sleep.
 * @write:		callback function used by some demod legacy drivers to
 *			allow other drivers to write data into their registers.
 *			Should not be used on new drivers.
 * @tune:		callback function used by demod drivers that use
 *			@DVBFE_ALGO_HW to tune into a frequency.
 * @get_frontend_algo:	returns the desired hardware algorithm.
 * @set_frontend:	callback function used to inform the demod to set the
 *			parameters for demodulating a digital TV channel.
 *			The properties to be used are stored at &struct
 *			dvb_frontend.dtv_property_cache. The demod can change
 *			the parameters to reflect the changes needed for the
 *			channel to be decoded, and update statistics.
 * @get_tune_settings:	callback function
 * @get_frontend:	callback function used to inform the parameters
 *			actuall in use. The properties to be used are stored at
 *			&struct dvb_frontend.dtv_property_cache and update
 *			statistics. Please notice that it should not return
 *			an error code if the statistics are not available
 *			because the demog is not locked.
 * @read_status:	returns the locking status of the frontend.
 * @read_ber:		legacy callback function to return the bit error rate.
 *			Newer drivers should provide such info via DVBv5 API,
 *			e. g. @set_frontend;/@get_frontend, implementing this
 *			callback only if DVBv3 API compatibility is wanted.
 * @read_signal_strength: legacy callback function to return the signal
 *			strength. Newer drivers should provide such info via
 *			DVBv5 API, e. g. @set_frontend/@get_frontend,
 *			implementing this callback only if DVBv3 API
 *			compatibility is wanted.
 * @read_snr:		legacy callback function to return the Signal/Noise
 * 			rate. Newer drivers should provide such info via
 *			DVBv5 API, e. g. @set_frontend/@get_frontend,
 *			implementing this callback only if DVBv3 API
 *			compatibility is wanted.
 * @read_ucblocks:	legacy callback function to return the Uncorrected Error
 *			Blocks. Newer drivers should provide such info via
 *			DVBv5 API, e. g. @set_frontend/@get_frontend,
 *			implementing this callback only if DVBv3 API
 *			compatibility is wanted.
 * @diseqc_reset_overload: callback function to implement the
 *			FE_DISEQC_RESET_OVERLOAD() ioctl (only Satellite)
 * @diseqc_send_master_cmd: callback function to implement the
 *			FE_DISEQC_SEND_MASTER_CMD() ioctl (only Satellite).
 * @diseqc_recv_slave_reply: callback function to implement the
 *			FE_DISEQC_RECV_SLAVE_REPLY() ioctl (only Satellite)
 * @diseqc_send_burst:	callback function to implement the
 *			FE_DISEQC_SEND_BURST() ioctl (only Satellite).
 * @set_tone:		callback function to implement the
 *			FE_SET_TONE() ioctl (only Satellite).
 * @set_voltage:	callback function to implement the
 *			FE_SET_VOLTAGE() ioctl (only Satellite).
 * @enable_high_lnb_voltage: callback function to implement the
 *			FE_ENABLE_HIGH_LNB_VOLTAGE() ioctl (only Satellite).
 * @dishnetwork_send_legacy_command: callback function to implement the
 *			FE_DISHNETWORK_SEND_LEGACY_CMD() ioctl (only Satellite).
 *			Drivers should not use this, except when the DVB
 *			core emulation fails to provide proper support (e.g.
 *			if @set_voltage takes more than 8ms to work), and
 *			when backward compatibility with this legacy API is
 *			required.
 * @i2c_gate_ctrl:	controls the I2C gate. Newer drivers should use I2C
 *			mux support instead.
 * @ts_bus_ctrl:	callback function used to take control of the TS bus.
 * @set_lna:		callback function to power on/off/auto the LNA.
 * @search:		callback function used on some custom algo search algos.
 * @tuner_ops:		pointer to &struct dvb_tuner_ops
 * @analog_ops:		pointer to &struct analog_demod_ops
 */
struct dvb_frontend_ops {
	struct dvb_frontend_info info;

	u8 delsys[MAX_DELSYS];

	void (*detach)(struct dvb_frontend *fe);
	void (*release)(struct dvb_frontend* fe);
	void (*release_sec)(struct dvb_frontend* fe);

	int (*init)(struct dvb_frontend* fe);
	int (*sleep)(struct dvb_frontend* fe);

	int (*write)(struct dvb_frontend* fe, const u8 buf[], int len);

	/* if this is set, it overrides the default swzigzag */
	int (*tune)(struct dvb_frontend* fe,
		    bool re_tune,
		    unsigned int mode_flags,
		    unsigned int *delay,
		    enum fe_status *status);

	/* get frontend tuning algorithm from the module */
	enum dvbfe_algo (*get_frontend_algo)(struct dvb_frontend *fe);

	/* these two are only used for the swzigzag code */
	int (*set_frontend)(struct dvb_frontend *fe);
	int (*get_tune_settings)(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* settings);

	int (*get_frontend)(struct dvb_frontend *fe,
			    struct dtv_frontend_properties *props);

	int (*read_status)(struct dvb_frontend *fe, enum fe_status *status);
	int (*read_ber)(struct dvb_frontend* fe, u32* ber);
	int (*read_signal_strength)(struct dvb_frontend* fe, u16* strength);
	int (*read_snr)(struct dvb_frontend* fe, u16* snr);
	int (*read_ucblocks)(struct dvb_frontend* fe, u32* ucblocks);

	int (*diseqc_reset_overload)(struct dvb_frontend* fe);
	int (*diseqc_send_master_cmd)(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd* cmd);
	int (*diseqc_recv_slave_reply)(struct dvb_frontend* fe, struct dvb_diseqc_slave_reply* reply);
	int (*diseqc_send_burst)(struct dvb_frontend *fe,
				 enum fe_sec_mini_cmd minicmd);
	int (*set_tone)(struct dvb_frontend *fe, enum fe_sec_tone_mode tone);
	int (*set_voltage)(struct dvb_frontend *fe,
			   enum fe_sec_voltage voltage);
	int (*enable_high_lnb_voltage)(struct dvb_frontend* fe, long arg);
	int (*dishnetwork_send_legacy_command)(struct dvb_frontend* fe, unsigned long cmd);
	int (*i2c_gate_ctrl)(struct dvb_frontend* fe, int enable);
	int (*ts_bus_ctrl)(struct dvb_frontend* fe, int acquire);
	int (*set_lna)(struct dvb_frontend *);

	/*
	 * These callbacks are for devices that implement their own
	 * tuning algorithms, rather than a simple swzigzag
	 */
	enum dvbfe_search (*search)(struct dvb_frontend *fe);

	struct dvb_tuner_ops tuner_ops;
	struct analog_demod_ops analog_ops;
};

#ifdef __DVB_CORE__
#define MAX_EVENT 8

/* Used only internally at dvb_frontend.c */
struct dvb_fe_events {
	struct dvb_frontend_event events[MAX_EVENT];
	int			  eventw;
	int			  eventr;
	int			  overflow;
	wait_queue_head_t	  wait_queue;
	struct mutex		  mtx;
};
#endif

/**
 * struct dtv_frontend_properties - contains a list of properties that are
 *				    specific to a digital TV standard.
 *
 * @frequency:		frequency in Hz for terrestrial/cable or in kHz for
 *			Satellite
 * @modulation:		Frontend modulation type
 * @voltage:		SEC voltage (only Satellite)
 * @sectone:		SEC tone mode (only Satellite)
 * @inversion:		Spectral inversion
 * @fec_inner:		Forward error correction inner Code Rate
 * @transmission_mode:	Transmission Mode
 * @bandwidth_hz:	Bandwidth, in Hz. A zero value means that userspace
 * 			wants to autodetect.
 * @guard_interval:	Guard Interval
 * @hierarchy:		Hierarchy
 * @symbol_rate:	Symbol Rate
 * @code_rate_HP:	high priority stream code rate
 * @code_rate_LP:	low priority stream code rate
 * @pilot:		Enable/disable/autodetect pilot tones
 * @rolloff:		Rolloff factor (alpha)
 * @delivery_system:	FE delivery system (e. g. digital TV standard)
 * @interleaving:	interleaving
 * @isdbt_partial_reception: ISDB-T partial reception (only ISDB standard)
 * @isdbt_sb_mode:	ISDB-T Sound Broadcast (SB) mode (only ISDB standard)
 * @isdbt_sb_subchannel:	ISDB-T SB subchannel (only ISDB standard)
 * @isdbt_sb_segment_idx:	ISDB-T SB segment index (only ISDB standard)
 * @isdbt_sb_segment_count:	ISDB-T SB segment count (only ISDB standard)
 * @isdbt_layer_enabled:	ISDB Layer enabled (only ISDB standard)
 * @layer:		ISDB per-layer data (only ISDB standard)
 * @layer.segment_count: Segment Count;
 * @layer.fec:		per layer code rate;
 * @layer.modulation:	per layer modulation;
 * @layer.interleaving:	 per layer interleaving.
 * @stream_id:		If different than zero, enable substream filtering, if
 *			hardware supports (DVB-S2 and DVB-T2).
 * @scrambling_sequence_index:	Carries the index of the DVB-S2 physical layer
 *				scrambling sequence.
 * @atscmh_fic_ver:	Version number of the FIC (Fast Information Channel)
 *			signaling data (only ATSC-M/H)
 * @atscmh_parade_id:	Parade identification number (only ATSC-M/H)
 * @atscmh_nog:		Number of MH groups per MH subframe for a designated
 *			parade (only ATSC-M/H)
 * @atscmh_tnog:	Total number of MH groups including all MH groups
 *			belonging to all MH parades in one MH subframe
 *			(only ATSC-M/H)
 * @atscmh_sgn:		Start group number (only ATSC-M/H)
 * @atscmh_prc:		Parade repetition cycle (only ATSC-M/H)
 * @atscmh_rs_frame_mode:	Reed Solomon (RS) frame mode (only ATSC-M/H)
 * @atscmh_rs_frame_ensemble:	RS frame ensemble (only ATSC-M/H)
 * @atscmh_rs_code_mode_pri:	RS code mode pri (only ATSC-M/H)
 * @atscmh_rs_code_mode_sec:	RS code mode sec (only ATSC-M/H)
 * @atscmh_sccc_block_mode:	Series Concatenated Convolutional Code (SCCC)
 *				Block Mode (only ATSC-M/H)
 * @atscmh_sccc_code_mode_a:	SCCC code mode A (only ATSC-M/H)
 * @atscmh_sccc_code_mode_b:	SCCC code mode B (only ATSC-M/H)
 * @atscmh_sccc_code_mode_c:	SCCC code mode C (only ATSC-M/H)
 * @atscmh_sccc_code_mode_d:	SCCC code mode D (only ATSC-M/H)
 * @lna:		Power ON/OFF/AUTO the Linear Now-noise Amplifier (LNA)
 * @strength:		DVBv5 API statistics: Signal Strength
 * @cnr:		DVBv5 API statistics: Signal to Noise ratio of the
 * 			(main) carrier
 * @pre_bit_error:	DVBv5 API statistics: pre-Viterbi bit error count
 * @pre_bit_count:	DVBv5 API statistics: pre-Viterbi bit count
 * @post_bit_error:	DVBv5 API statistics: post-Viterbi bit error count
 * @post_bit_count:	DVBv5 API statistics: post-Viterbi bit count
 * @block_error:	DVBv5 API statistics: block error count
 * @block_count:	DVBv5 API statistics: block count
 *
 * NOTE: derivated statistics like Uncorrected Error blocks (UCE) are
 * calculated on userspace.
 *
 * Only a subset of the properties are needed for a given delivery system.
 * For more info, consult the media_api.html with the documentation of the
 * Userspace API.
 */
struct dtv_frontend_properties {
	u32			frequency;
	enum fe_modulation	modulation;

	enum fe_sec_voltage	voltage;
	enum fe_sec_tone_mode	sectone;
	enum fe_spectral_inversion inversion;
	enum fe_code_rate	fec_inner;
	enum fe_transmit_mode	transmission_mode;
	u32			bandwidth_hz;	/* 0 = AUTO */
	enum fe_guard_interval	guard_interval;
	enum fe_hierarchy	hierarchy;
	u32			symbol_rate;
	enum fe_code_rate	code_rate_HP;
	enum fe_code_rate	code_rate_LP;

	enum fe_pilot		pilot;
	enum fe_rolloff		rolloff;

	enum fe_delivery_system	delivery_system;

	enum fe_interleaving	interleaving;

	/* ISDB-T specifics */
	u8			isdbt_partial_reception;
	u8			isdbt_sb_mode;
	u8			isdbt_sb_subchannel;
	u32			isdbt_sb_segment_idx;
	u32			isdbt_sb_segment_count;
	u8			isdbt_layer_enabled;
	struct {
	    u8			segment_count;
	    enum fe_code_rate	fec;
	    enum fe_modulation	modulation;
	    u8			interleaving;
	} layer[3];

	/* Multistream specifics */
	u32			stream_id;

	/* Physical Layer Scrambling specifics */
	u32			scrambling_sequence_index;

	/* ATSC-MH specifics */
	u8			atscmh_fic_ver;
	u8			atscmh_parade_id;
	u8			atscmh_nog;
	u8			atscmh_tnog;
	u8			atscmh_sgn;
	u8			atscmh_prc;

	u8			atscmh_rs_frame_mode;
	u8			atscmh_rs_frame_ensemble;
	u8			atscmh_rs_code_mode_pri;
	u8			atscmh_rs_code_mode_sec;
	u8			atscmh_sccc_block_mode;
	u8			atscmh_sccc_code_mode_a;
	u8			atscmh_sccc_code_mode_b;
	u8			atscmh_sccc_code_mode_c;
	u8			atscmh_sccc_code_mode_d;

	u32			lna;

	/* statistics data */
	struct dtv_fe_stats	strength;
	struct dtv_fe_stats	cnr;
	struct dtv_fe_stats	pre_bit_error;
	struct dtv_fe_stats	pre_bit_count;
	struct dtv_fe_stats	post_bit_error;
	struct dtv_fe_stats	post_bit_count;
	struct dtv_fe_stats	block_error;
	struct dtv_fe_stats	block_count;
};

#define DVB_FE_NO_EXIT  0
#define DVB_FE_NORMAL_EXIT      1
#define DVB_FE_DEVICE_REMOVED   2
#define DVB_FE_DEVICE_RESUME    3

/**
 * struct dvb_frontend - Frontend structure to be used on drivers.
 *
 * @refcount:		refcount to keep track of &struct dvb_frontend
 *			references
 * @ops:		embedded &struct dvb_frontend_ops
 * @dvb:		pointer to &struct dvb_adapter
 * @demodulator_priv:	demod private data
 * @tuner_priv:		tuner private data
 * @frontend_priv:	frontend private data
 * @sec_priv:		SEC private data
 * @analog_demod_priv:	Analog demod private data
 * @dtv_property_cache:	embedded &struct dtv_frontend_properties
 * @callback:		callback function used on some drivers to call
 *			either the tuner or the demodulator.
 * @id:			Frontend ID
 * @exit:		Used to inform the DVB core that the frontend
 *			thread should exit (usually, means that the hardware
 *			got disconnected.
 */

struct dvb_frontend {
	struct kref refcount;
	struct dvb_frontend_ops ops;
	struct dvb_adapter *dvb;
	void *demodulator_priv;
	void *tuner_priv;
	void *frontend_priv;
	void *sec_priv;
	void *analog_demod_priv;
	struct dtv_frontend_properties dtv_property_cache;
#define DVB_FRONTEND_COMPONENT_TUNER 0
#define DVB_FRONTEND_COMPONENT_DEMOD 1
	int (*callback)(void *adapter_priv, int component, int cmd, int arg);
	int id;
	unsigned int exit;
};

/**
 * dvb_register_frontend() - Registers a DVB frontend at the adapter
 *
 * @dvb: pointer to &struct dvb_adapter
 * @fe: pointer to &struct dvb_frontend
 *
 * Allocate and initialize the private data needed by the frontend core to
 * manage the frontend and calls dvb_register_device() to register a new
 * frontend. It also cleans the property cache that stores the frontend
 * parameters and selects the first available delivery system.
 */
int dvb_register_frontend(struct dvb_adapter *dvb,
				 struct dvb_frontend *fe);

/**
 * dvb_unregister_frontend() - Unregisters a DVB frontend
 *
 * @fe: pointer to &struct dvb_frontend
 *
 * Stops the frontend kthread, calls dvb_unregister_device() and frees the
 * private frontend data allocated by dvb_register_frontend().
 *
 * NOTE: This function doesn't frees the memory allocated by the demod,
 * by the SEC driver and by the tuner. In order to free it, an explicit call to
 * dvb_frontend_detach() is needed, after calling this function.
 */
int dvb_unregister_frontend(struct dvb_frontend *fe);

/**
 * dvb_frontend_detach() - Detaches and frees frontend specific data
 *
 * @fe: pointer to &struct dvb_frontend
 *
 * This function should be called after dvb_unregister_frontend(). It
 * calls the SEC, tuner and demod release functions:
 * &dvb_frontend_ops.release_sec, &dvb_frontend_ops.tuner_ops.release,
 * &dvb_frontend_ops.analog_ops.release and &dvb_frontend_ops.release.
 *
 * If the driver is compiled with %CONFIG_MEDIA_ATTACH, it also decreases
 * the module reference count, needed to allow userspace to remove the
 * previously used DVB frontend modules.
 */
void dvb_frontend_detach(struct dvb_frontend *fe);

/**
 * dvb_frontend_suspend() - Suspends a Digital TV frontend
 *
 * @fe: pointer to &struct dvb_frontend
 *
 * This function prepares a Digital TV frontend to suspend.
 *
 * In order to prepare the tuner to suspend, if
 * &dvb_frontend_ops.tuner_ops.suspend\(\) is available, it calls it. Otherwise,
 * it will call &dvb_frontend_ops.tuner_ops.sleep\(\), if available.
 *
 * It will also call &dvb_frontend_ops.sleep\(\) to put the demod to suspend.
 *
 * The drivers should also call dvb_frontend_suspend\(\) as part of their
 * handler for the &device_driver.suspend\(\).
 */
int dvb_frontend_suspend(struct dvb_frontend *fe);

/**
 * dvb_frontend_resume() - Resumes a Digital TV frontend
 *
 * @fe: pointer to &struct dvb_frontend
 *
 * This function resumes the usual operation of the tuner after resume.
 *
 * In order to resume the frontend, it calls the demod &dvb_frontend_ops.init\(\).
 *
 * If &dvb_frontend_ops.tuner_ops.resume\(\) is available, It, it calls it.
 * Otherwise,t will call &dvb_frontend_ops.tuner_ops.init\(\), if available.
 *
 * Once tuner and demods are resumed, it will enforce that the SEC voltage and
 * tone are restored to their previous values and wake up the frontend's
 * kthread in order to retune the frontend.
 *
 * The drivers should also call dvb_frontend_resume() as part of their
 * handler for the &device_driver.resume\(\).
 */
int dvb_frontend_resume(struct dvb_frontend *fe);

/**
 * dvb_frontend_reinitialise() - forces a reinitialisation at the frontend
 *
 * @fe: pointer to &struct dvb_frontend
 *
 * Calls &dvb_frontend_ops.init\(\) and &dvb_frontend_ops.tuner_ops.init\(\),
 * and resets SEC tone and voltage (for Satellite systems).
 *
 * NOTE: Currently, this function is used only by one driver (budget-av).
 * It seems to be due to address some special issue with that specific
 * frontend.
 */
void dvb_frontend_reinitialise(struct dvb_frontend *fe);

/**
 * dvb_frontend_sleep_until() - Sleep for the amount of time given by
 *                      add_usec parameter
 *
 * @waketime: pointer to &struct ktime_t
 * @add_usec: time to sleep, in microseconds
 *
 * This function is used to measure the time required for the
 * FE_DISHNETWORK_SEND_LEGACY_CMD() ioctl to work. It needs to be as precise
 * as possible, as it affects the detection of the dish tone command at the
 * satellite subsystem.
 *
 * Its used internally by the DVB frontend core, in order to emulate
 * FE_DISHNETWORK_SEND_LEGACY_CMD() using the &dvb_frontend_ops.set_voltage\(\)
 * callback.
 *
 * NOTE: it should not be used at the drivers, as the emulation for the
 * legacy callback is provided by the Kernel. The only situation where this
 * should be at the drivers is when there are some bugs at the hardware that
 * would prevent the core emulation to work. On such cases, the driver would
 * be writing a &dvb_frontend_ops.dishnetwork_send_legacy_command\(\) and
 * calling this function directly.
 */
void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec);

#endif