1 /*
2  * dvb_frontend.h
3  *
4  * The Digital TV Frontend kABI defines a driver-internal interface for
5  * registering low-level, hardware specific driver to a hardware independent
6  * frontend layer.
7  *
8  * Copyright (C) 2001 convergence integrated media GmbH
9  * Copyright (C) 2004 convergence GmbH
10  *
11  * Written by Ralph Metzler
12  * Overhauled by Holger Waechtler
13  * Kernel I2C stuff by Michael Hunold <hunold@convergence.de>
14  *
15  * This program is free software; you can redistribute it and/or
16  * modify it under the terms of the GNU Lesser General Public License
17  * as published by the Free Software Foundation; either version 2.1
18  * of the License, or (at your option) any later version.
19  *
20  * This program is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23  * GNU General Public License for more details.
24  *
25 
26  * You should have received a copy of the GNU Lesser General Public License
27  * along with this program; if not, write to the Free Software
28  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
29  *
30  */
31 
32 #ifndef _DVB_FRONTEND_H_
33 #define _DVB_FRONTEND_H_
34 
35 #include <linux/types.h>
36 #include <linux/sched.h>
37 #include <linux/ioctl.h>
38 #include <linux/i2c.h>
39 #include <linux/module.h>
40 #include <linux/errno.h>
41 #include <linux/delay.h>
42 #include <linux/mutex.h>
43 #include <linux/slab.h>
44 #include <linux/bitops.h>
45 
46 #include <linux/dvb/frontend.h>
47 
48 #include <media/dvbdev.h>
49 
50 /*
51  * Maximum number of Delivery systems per frontend. It
52  * should be smaller or equal to 32
53  */
54 #define MAX_DELSYS	8
55 
56 /* Helper definitions to be used at frontend drivers */
57 #define kHz 1000UL
58 #define MHz 1000000UL
59 
60 /**
61  * struct dvb_frontend_tune_settings - parameters to adjust frontend tuning
62  *
63  * @min_delay_ms:	minimum delay for tuning, in ms
64  * @step_size:		step size between two consecutive frequencies
65  * @max_drift:		maximum drift
66  *
67  * NOTE: step_size is in Hz, for terrestrial/cable or kHz for satellite
68  */
69 struct dvb_frontend_tune_settings {
70 	int min_delay_ms;
71 	int step_size;
72 	int max_drift;
73 };
74 
75 struct dvb_frontend;
76 
77 /**
78  * struct dvb_tuner_info - Frontend name and min/max ranges/bandwidths
79  *
80  * @name:		name of the Frontend
81  * @frequency_min_hz:	minimal frequency supported in Hz
82  * @frequency_max_hz:	maximum frequency supported in Hz
83  * @frequency_step_hz:	frequency step in Hz
84  * @bandwidth_min:	minimal frontend bandwidth supported
85  * @bandwidth_max:	maximum frontend bandwidth supported
86  * @bandwidth_step:	frontend bandwidth step
87  */
88 struct dvb_tuner_info {
89 	char name[128];
90 
91 	u32 frequency_min_hz;
92 	u32 frequency_max_hz;
93 	u32 frequency_step_hz;
94 
95 	u32 bandwidth_min;
96 	u32 bandwidth_max;
97 	u32 bandwidth_step;
98 };
99 
100 /**
101  * struct analog_parameters - Parameters to tune into an analog/radio channel
102  *
103  * @frequency:	Frequency used by analog TV tuner (either in 62.5 kHz step,
104  *		for TV, or 62.5 Hz for radio)
105  * @mode:	Tuner mode, as defined on enum v4l2_tuner_type
106  * @audmode:	Audio mode as defined for the rxsubchans field at videodev2.h,
107  *		e. g. V4L2_TUNER_MODE_*
108  * @std:	TV standard bitmap as defined at videodev2.h, e. g. V4L2_STD_*
109  *
110  * Hybrid tuners should be supported by both V4L2 and DVB APIs. This
111  * struct contains the data that are used by the V4L2 side. To avoid
112  * dependencies from V4L2 headers, all enums here are declared as integers.
113  */
114 struct analog_parameters {
115 	unsigned int frequency;
116 	unsigned int mode;
117 	unsigned int audmode;
118 	u64 std;
119 };
120 
121 /**
122  * enum dvbfe_algo - defines the algorithm used to tune into a channel
123  *
124  * @DVBFE_ALGO_HW: Hardware Algorithm -
125  *	Devices that support this algorithm do everything in hardware
126  *	and no software support is needed to handle them.
127  *	Requesting these devices to LOCK is the only thing required,
128  *	device is supposed to do everything in the hardware.
129  *
130  * @DVBFE_ALGO_SW: Software Algorithm -
131  * These are dumb devices, that require software to do everything
132  *
133  * @DVBFE_ALGO_CUSTOM: Customizable Agorithm -
134  *	Devices having this algorithm can be customized to have specific
135  *	algorithms in the frontend driver, rather than simply doing a
136  *	software zig-zag. In this case the zigzag maybe hardware assisted
137  *	or it maybe completely done in hardware. In all cases, usage of
138  *	this algorithm, in conjunction with the search and track
139  *	callbacks, utilizes the driver specific algorithm.
140  *
141  * @DVBFE_ALGO_RECOVERY: Recovery Algorithm -
142  *	These devices have AUTO recovery capabilities from LOCK failure
143  */
144 enum dvbfe_algo {
145 	DVBFE_ALGO_HW			= BIT(0),
146 	DVBFE_ALGO_SW			= BIT(1),
147 	DVBFE_ALGO_CUSTOM		= BIT(2),
148 	DVBFE_ALGO_RECOVERY		= BIT(31),
149 };
150 
151 /**
152  * enum dvbfe_search - search callback possible return status
153  *
154  * @DVBFE_ALGO_SEARCH_SUCCESS:
155  *	The frontend search algorithm completed and returned successfully
156  *
157  * @DVBFE_ALGO_SEARCH_ASLEEP:
158  *	The frontend search algorithm is sleeping
159  *
160  * @DVBFE_ALGO_SEARCH_FAILED:
161  *	The frontend search for a signal failed
162  *
163  * @DVBFE_ALGO_SEARCH_INVALID:
164  *	The frontend search algorithm was probably supplied with invalid
165  *	parameters and the search is an invalid one
166  *
167  * @DVBFE_ALGO_SEARCH_ERROR:
168  *	The frontend search algorithm failed due to some error
169  *
170  * @DVBFE_ALGO_SEARCH_AGAIN:
171  *	The frontend search algorithm was requested to search again
172  */
173 enum dvbfe_search {
174 	DVBFE_ALGO_SEARCH_SUCCESS	= BIT(0),
175 	DVBFE_ALGO_SEARCH_ASLEEP	= BIT(1),
176 	DVBFE_ALGO_SEARCH_FAILED	= BIT(2),
177 	DVBFE_ALGO_SEARCH_INVALID	= BIT(3),
178 	DVBFE_ALGO_SEARCH_AGAIN		= BIT(4),
179 	DVBFE_ALGO_SEARCH_ERROR		= BIT(31),
180 };
181 
182 /**
183  * struct dvb_tuner_ops - Tuner information and callbacks
184  *
185  * @info:		embedded &struct dvb_tuner_info with tuner properties
186  * @release:		callback function called when frontend is detached.
187  *			drivers should free any allocated memory.
188  * @init:		callback function used to initialize the tuner device.
189  * @sleep:		callback function used to put the tuner to sleep.
190  * @suspend:		callback function used to inform that the Kernel will
191  *			suspend.
192  * @resume:		callback function used to inform that the Kernel is
193  *			resuming from suspend.
194  * @set_params:		callback function used to inform the tuner to tune
195  *			into a digital TV channel. The properties to be used
196  *			are stored at &struct dvb_frontend.dtv_property_cache.
197  *			The tuner demod can change the parameters to reflect
198  *			the changes needed for the channel to be tuned, and
199  *			update statistics. This is the recommended way to set
200  *			the tuner parameters and should be used on newer
201  *			drivers.
202  * @set_analog_params:	callback function used to tune into an analog TV
203  *			channel on hybrid tuners. It passes @analog_parameters
204  *			to the driver.
205  * @set_config:		callback function used to send some tuner-specific
206  *			parameters.
207  * @get_frequency:	get the actual tuned frequency
208  * @get_bandwidth:	get the bandwidth used by the low pass filters
209  * @get_if_frequency:	get the Intermediate Frequency, in Hz. For baseband,
210  *			should return 0.
211  * @get_status:		returns the frontend lock status
212  * @get_rf_strength:	returns the RF signal strength. Used mostly to support
213  *			analog TV and radio. Digital TV should report, instead,
214  *			via DVBv5 API (&struct dvb_frontend.dtv_property_cache).
215  * @get_afc:		Used only by analog TV core. Reports the frequency
216  *			drift due to AFC.
217  * @calc_regs:		callback function used to pass register data settings
218  *			for simple tuners.  Shouldn't be used on newer drivers.
219  * @set_frequency:	Set a new frequency. Shouldn't be used on newer drivers.
220  * @set_bandwidth:	Set a new frequency. Shouldn't be used on newer drivers.
221  *
222  * NOTE: frequencies used on @get_frequency and @set_frequency are in Hz for
223  * terrestrial/cable or kHz for satellite.
224  *
225  */
226 struct dvb_tuner_ops {
227 
228 	struct dvb_tuner_info info;
229 
230 	void (*release)(struct dvb_frontend *fe);
231 	int (*init)(struct dvb_frontend *fe);
232 	int (*sleep)(struct dvb_frontend *fe);
233 	int (*suspend)(struct dvb_frontend *fe);
234 	int (*resume)(struct dvb_frontend *fe);
235 
236 	/* This is the recommended way to set the tuner */
237 	int (*set_params)(struct dvb_frontend *fe);
238 	int (*set_analog_params)(struct dvb_frontend *fe, struct analog_parameters *p);
239 
240 	int (*set_config)(struct dvb_frontend *fe, void *priv_cfg);
241 
242 	int (*get_frequency)(struct dvb_frontend *fe, u32 *frequency);
243 	int (*get_bandwidth)(struct dvb_frontend *fe, u32 *bandwidth);
244 	int (*get_if_frequency)(struct dvb_frontend *fe, u32 *frequency);
245 
246 #define TUNER_STATUS_LOCKED 1
247 #define TUNER_STATUS_STEREO 2
248 	int (*get_status)(struct dvb_frontend *fe, u32 *status);
249 	int (*get_rf_strength)(struct dvb_frontend *fe, u16 *strength);
250 	int (*get_afc)(struct dvb_frontend *fe, s32 *afc);
251 
252 	/*
253 	 * This is support for demods like the mt352 - fills out the supplied
254 	 * buffer with what to write.
255 	 *
256 	 * Don't use on newer drivers.
257 	 */
258 	int (*calc_regs)(struct dvb_frontend *fe, u8 *buf, int buf_len);
259 
260 	/*
261 	 * These are provided separately from set_params in order to
262 	 * facilitate silicon tuners which require sophisticated tuning loops,
263 	 * controlling each parameter separately.
264 	 *
265 	 * Don't use on newer drivers.
266 	 */
267 	int (*set_frequency)(struct dvb_frontend *fe, u32 frequency);
268 	int (*set_bandwidth)(struct dvb_frontend *fe, u32 bandwidth);
269 };
270 
271 /**
272  * struct analog_demod_info - Information struct for analog TV part of the demod
273  *
274  * @name:	Name of the analog TV demodulator
275  */
276 struct analog_demod_info {
277 	char *name;
278 };
279 
280 /**
281  * struct analog_demod_ops  - Demodulation information and callbacks for
282  *			      analog TV and radio
283  *
284  * @info:		pointer to struct analog_demod_info
285  * @set_params:		callback function used to inform the demod to set the
286  *			demodulator parameters needed to decode an analog or
287  *			radio channel. The properties are passed via
288  *			&struct analog_params.
289  * @has_signal:		returns 0xffff if has signal, or 0 if it doesn't.
290  * @get_afc:		Used only by analog TV core. Reports the frequency
291  *			drift due to AFC.
292  * @tuner_status:	callback function that returns tuner status bits, e. g.
293  *			%TUNER_STATUS_LOCKED and %TUNER_STATUS_STEREO.
294  * @standby:		set the tuner to standby mode.
295  * @release:		callback function called when frontend is detached.
296  *			drivers should free any allocated memory.
297  * @i2c_gate_ctrl:	controls the I2C gate. Newer drivers should use I2C
298  *			mux support instead.
299  * @set_config:		callback function used to send some tuner-specific
300  *			parameters.
301  */
302 struct analog_demod_ops {
303 
304 	struct analog_demod_info info;
305 
306 	void (*set_params)(struct dvb_frontend *fe,
307 			   struct analog_parameters *params);
308 	int  (*has_signal)(struct dvb_frontend *fe, u16 *signal);
309 	int  (*get_afc)(struct dvb_frontend *fe, s32 *afc);
310 	void (*tuner_status)(struct dvb_frontend *fe);
311 	void (*standby)(struct dvb_frontend *fe);
312 	void (*release)(struct dvb_frontend *fe);
313 	int  (*i2c_gate_ctrl)(struct dvb_frontend *fe, int enable);
314 
315 	/** This is to allow setting tuner-specific configuration */
316 	int (*set_config)(struct dvb_frontend *fe, void *priv_cfg);
317 };
318 
319 struct dtv_frontend_properties;
320 
321 /**
322  * struct dvb_frontend_internal_info - Frontend properties and capabilities
323  *
324  * @name:			Name of the frontend
325  * @frequency_min_hz:		Minimal frequency supported by the frontend.
326  * @frequency_max_hz:		Minimal frequency supported by the frontend.
327  * @frequency_stepsize_hz:	All frequencies are multiple of this value.
328  * @frequency_tolerance_hz:	Frequency tolerance.
329  * @symbol_rate_min:		Minimal symbol rate, in bauds
330  *				(for Cable/Satellite systems).
331  * @symbol_rate_max:		Maximal symbol rate, in bauds
332  *				(for Cable/Satellite systems).
333  * @symbol_rate_tolerance:	Maximal symbol rate tolerance, in ppm
334  *				(for Cable/Satellite systems).
335  * @caps:			Capabilities supported by the frontend,
336  *				as specified in &enum fe_caps.
337  */
338 struct dvb_frontend_internal_info {
339 	char	name[128];
340 	u32	frequency_min_hz;
341 	u32	frequency_max_hz;
342 	u32	frequency_stepsize_hz;
343 	u32	frequency_tolerance_hz;
344 	u32	symbol_rate_min;
345 	u32	symbol_rate_max;
346 	u32	symbol_rate_tolerance;
347 	enum fe_caps caps;
348 };
349 
350 /**
351  * struct dvb_frontend_ops - Demodulation information and callbacks for
352  *			      ditialt TV
353  *
354  * @info:		embedded &struct dvb_tuner_info with tuner properties
355  * @delsys:		Delivery systems supported by the frontend
356  * @detach:		callback function called when frontend is detached.
357  *			drivers should clean up, but not yet free the &struct
358  *			dvb_frontend allocation.
359  * @release:		callback function called when frontend is ready to be
360  *			freed.
361  *			drivers should free any allocated memory.
362  * @release_sec:	callback function requesting that the Satellite Equipment
363  *			Control (SEC) driver to release and free any memory
364  *			allocated by the driver.
365  * @init:		callback function used to initialize the tuner device.
366  * @sleep:		callback function used to put the tuner to sleep.
367  * @suspend:		callback function used to inform that the Kernel will
368  *			suspend.
369  * @resume:		callback function used to inform that the Kernel is
370  *			resuming from suspend.
371  * @write:		callback function used by some demod legacy drivers to
372  *			allow other drivers to write data into their registers.
373  *			Should not be used on new drivers.
374  * @tune:		callback function used by demod drivers that use
375  *			@DVBFE_ALGO_HW to tune into a frequency.
376  * @get_frontend_algo:	returns the desired hardware algorithm.
377  * @set_frontend:	callback function used to inform the demod to set the
378  *			parameters for demodulating a digital TV channel.
379  *			The properties to be used are stored at &struct
380  *			dvb_frontend.dtv_property_cache. The demod can change
381  *			the parameters to reflect the changes needed for the
382  *			channel to be decoded, and update statistics.
383  * @get_tune_settings:	callback function
384  * @get_frontend:	callback function used to inform the parameters
385  *			actuall in use. The properties to be used are stored at
386  *			&struct dvb_frontend.dtv_property_cache and update
387  *			statistics. Please notice that it should not return
388  *			an error code if the statistics are not available
389  *			because the demog is not locked.
390  * @read_status:	returns the locking status of the frontend.
391  * @read_ber:		legacy callback function to return the bit error rate.
392  *			Newer drivers should provide such info via DVBv5 API,
393  *			e. g. @set_frontend;/@get_frontend, implementing this
394  *			callback only if DVBv3 API compatibility is wanted.
395  * @read_signal_strength: legacy callback function to return the signal
396  *			strength. Newer drivers should provide such info via
397  *			DVBv5 API, e. g. @set_frontend/@get_frontend,
398  *			implementing this callback only if DVBv3 API
399  *			compatibility is wanted.
400  * @read_snr:		legacy callback function to return the Signal/Noise
401  *			rate. Newer drivers should provide such info via
402  *			DVBv5 API, e. g. @set_frontend/@get_frontend,
403  *			implementing this callback only if DVBv3 API
404  *			compatibility is wanted.
405  * @read_ucblocks:	legacy callback function to return the Uncorrected Error
406  *			Blocks. Newer drivers should provide such info via
407  *			DVBv5 API, e. g. @set_frontend/@get_frontend,
408  *			implementing this callback only if DVBv3 API
409  *			compatibility is wanted.
410  * @diseqc_reset_overload: callback function to implement the
411  *			FE_DISEQC_RESET_OVERLOAD() ioctl (only Satellite)
412  * @diseqc_send_master_cmd: callback function to implement the
413  *			FE_DISEQC_SEND_MASTER_CMD() ioctl (only Satellite).
414  * @diseqc_recv_slave_reply: callback function to implement the
415  *			FE_DISEQC_RECV_SLAVE_REPLY() ioctl (only Satellite)
416  * @diseqc_send_burst:	callback function to implement the
417  *			FE_DISEQC_SEND_BURST() ioctl (only Satellite).
418  * @set_tone:		callback function to implement the
419  *			FE_SET_TONE() ioctl (only Satellite).
420  * @set_voltage:	callback function to implement the
421  *			FE_SET_VOLTAGE() ioctl (only Satellite).
422  * @enable_high_lnb_voltage: callback function to implement the
423  *			FE_ENABLE_HIGH_LNB_VOLTAGE() ioctl (only Satellite).
424  * @dishnetwork_send_legacy_command: callback function to implement the
425  *			FE_DISHNETWORK_SEND_LEGACY_CMD() ioctl (only Satellite).
426  *			Drivers should not use this, except when the DVB
427  *			core emulation fails to provide proper support (e.g.
428  *			if @set_voltage takes more than 8ms to work), and
429  *			when backward compatibility with this legacy API is
430  *			required.
431  * @i2c_gate_ctrl:	controls the I2C gate. Newer drivers should use I2C
432  *			mux support instead.
433  * @ts_bus_ctrl:	callback function used to take control of the TS bus.
434  * @set_lna:		callback function to power on/off/auto the LNA.
435  * @search:		callback function used on some custom algo search algos.
436  * @tuner_ops:		pointer to &struct dvb_tuner_ops
437  * @analog_ops:		pointer to &struct analog_demod_ops
438  */
439 struct dvb_frontend_ops {
440 	struct dvb_frontend_internal_info info;
441 
442 	u8 delsys[MAX_DELSYS];
443 
444 	void (*detach)(struct dvb_frontend *fe);
445 	void (*release)(struct dvb_frontend* fe);
446 	void (*release_sec)(struct dvb_frontend* fe);
447 
448 	int (*init)(struct dvb_frontend* fe);
449 	int (*sleep)(struct dvb_frontend* fe);
450 	int (*suspend)(struct dvb_frontend *fe);
451 	int (*resume)(struct dvb_frontend *fe);
452 
453 	int (*write)(struct dvb_frontend* fe, const u8 buf[], int len);
454 
455 	/* if this is set, it overrides the default swzigzag */
456 	int (*tune)(struct dvb_frontend* fe,
457 		    bool re_tune,
458 		    unsigned int mode_flags,
459 		    unsigned int *delay,
460 		    enum fe_status *status);
461 
462 	/* get frontend tuning algorithm from the module */
463 	enum dvbfe_algo (*get_frontend_algo)(struct dvb_frontend *fe);
464 
465 	/* these two are only used for the swzigzag code */
466 	int (*set_frontend)(struct dvb_frontend *fe);
467 	int (*get_tune_settings)(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* settings);
468 
469 	int (*get_frontend)(struct dvb_frontend *fe,
470 			    struct dtv_frontend_properties *props);
471 
472 	int (*read_status)(struct dvb_frontend *fe, enum fe_status *status);
473 	int (*read_ber)(struct dvb_frontend* fe, u32* ber);
474 	int (*read_signal_strength)(struct dvb_frontend* fe, u16* strength);
475 	int (*read_snr)(struct dvb_frontend* fe, u16* snr);
476 	int (*read_ucblocks)(struct dvb_frontend* fe, u32* ucblocks);
477 
478 	int (*diseqc_reset_overload)(struct dvb_frontend* fe);
479 	int (*diseqc_send_master_cmd)(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd* cmd);
480 	int (*diseqc_recv_slave_reply)(struct dvb_frontend* fe, struct dvb_diseqc_slave_reply* reply);
481 	int (*diseqc_send_burst)(struct dvb_frontend *fe,
482 				 enum fe_sec_mini_cmd minicmd);
483 	int (*set_tone)(struct dvb_frontend *fe, enum fe_sec_tone_mode tone);
484 	int (*set_voltage)(struct dvb_frontend *fe,
485 			   enum fe_sec_voltage voltage);
486 	int (*enable_high_lnb_voltage)(struct dvb_frontend* fe, long arg);
487 	int (*dishnetwork_send_legacy_command)(struct dvb_frontend* fe, unsigned long cmd);
488 	int (*i2c_gate_ctrl)(struct dvb_frontend* fe, int enable);
489 	int (*ts_bus_ctrl)(struct dvb_frontend* fe, int acquire);
490 	int (*set_lna)(struct dvb_frontend *);
491 
492 	/*
493 	 * These callbacks are for devices that implement their own
494 	 * tuning algorithms, rather than a simple swzigzag
495 	 */
496 	enum dvbfe_search (*search)(struct dvb_frontend *fe);
497 
498 	struct dvb_tuner_ops tuner_ops;
499 	struct analog_demod_ops analog_ops;
500 };
501 
502 #ifdef __DVB_CORE__
503 #define MAX_EVENT 8
504 
505 /* Used only internally at dvb_frontend.c */
506 struct dvb_fe_events {
507 	struct dvb_frontend_event events[MAX_EVENT];
508 	int			  eventw;
509 	int			  eventr;
510 	int			  overflow;
511 	wait_queue_head_t	  wait_queue;
512 	struct mutex		  mtx;
513 };
514 #endif
515 
516 /**
517  * struct dtv_frontend_properties - contains a list of properties that are
518  *				    specific to a digital TV standard.
519  *
520  * @frequency:		frequency in Hz for terrestrial/cable or in kHz for
521  *			Satellite
522  * @modulation:		Frontend modulation type
523  * @voltage:		SEC voltage (only Satellite)
524  * @sectone:		SEC tone mode (only Satellite)
525  * @inversion:		Spectral inversion
526  * @fec_inner:		Forward error correction inner Code Rate
527  * @transmission_mode:	Transmission Mode
528  * @bandwidth_hz:	Bandwidth, in Hz. A zero value means that userspace
529  *			wants to autodetect.
530  * @guard_interval:	Guard Interval
531  * @hierarchy:		Hierarchy
532  * @symbol_rate:	Symbol Rate
533  * @code_rate_HP:	high priority stream code rate
534  * @code_rate_LP:	low priority stream code rate
535  * @pilot:		Enable/disable/autodetect pilot tones
536  * @rolloff:		Rolloff factor (alpha)
537  * @delivery_system:	FE delivery system (e. g. digital TV standard)
538  * @interleaving:	interleaving
539  * @isdbt_partial_reception: ISDB-T partial reception (only ISDB standard)
540  * @isdbt_sb_mode:	ISDB-T Sound Broadcast (SB) mode (only ISDB standard)
541  * @isdbt_sb_subchannel:	ISDB-T SB subchannel (only ISDB standard)
542  * @isdbt_sb_segment_idx:	ISDB-T SB segment index (only ISDB standard)
543  * @isdbt_sb_segment_count:	ISDB-T SB segment count (only ISDB standard)
544  * @isdbt_layer_enabled:	ISDB Layer enabled (only ISDB standard)
545  * @layer:		ISDB per-layer data (only ISDB standard)
546  * @layer.segment_count: Segment Count;
547  * @layer.fec:		per layer code rate;
548  * @layer.modulation:	per layer modulation;
549  * @layer.interleaving:	 per layer interleaving.
550  * @stream_id:		If different than zero, enable substream filtering, if
551  *			hardware supports (DVB-S2 and DVB-T2).
552  * @scrambling_sequence_index:	Carries the index of the DVB-S2 physical layer
553  *				scrambling sequence.
554  * @atscmh_fic_ver:	Version number of the FIC (Fast Information Channel)
555  *			signaling data (only ATSC-M/H)
556  * @atscmh_parade_id:	Parade identification number (only ATSC-M/H)
557  * @atscmh_nog:		Number of MH groups per MH subframe for a designated
558  *			parade (only ATSC-M/H)
559  * @atscmh_tnog:	Total number of MH groups including all MH groups
560  *			belonging to all MH parades in one MH subframe
561  *			(only ATSC-M/H)
562  * @atscmh_sgn:		Start group number (only ATSC-M/H)
563  * @atscmh_prc:		Parade repetition cycle (only ATSC-M/H)
564  * @atscmh_rs_frame_mode:	Reed Solomon (RS) frame mode (only ATSC-M/H)
565  * @atscmh_rs_frame_ensemble:	RS frame ensemble (only ATSC-M/H)
566  * @atscmh_rs_code_mode_pri:	RS code mode pri (only ATSC-M/H)
567  * @atscmh_rs_code_mode_sec:	RS code mode sec (only ATSC-M/H)
568  * @atscmh_sccc_block_mode:	Series Concatenated Convolutional Code (SCCC)
569  *				Block Mode (only ATSC-M/H)
570  * @atscmh_sccc_code_mode_a:	SCCC code mode A (only ATSC-M/H)
571  * @atscmh_sccc_code_mode_b:	SCCC code mode B (only ATSC-M/H)
572  * @atscmh_sccc_code_mode_c:	SCCC code mode C (only ATSC-M/H)
573  * @atscmh_sccc_code_mode_d:	SCCC code mode D (only ATSC-M/H)
574  * @lna:		Power ON/OFF/AUTO the Linear Now-noise Amplifier (LNA)
575  * @strength:		DVBv5 API statistics: Signal Strength
576  * @cnr:		DVBv5 API statistics: Signal to Noise ratio of the
577  *			(main) carrier
578  * @pre_bit_error:	DVBv5 API statistics: pre-Viterbi bit error count
579  * @pre_bit_count:	DVBv5 API statistics: pre-Viterbi bit count
580  * @post_bit_error:	DVBv5 API statistics: post-Viterbi bit error count
581  * @post_bit_count:	DVBv5 API statistics: post-Viterbi bit count
582  * @block_error:	DVBv5 API statistics: block error count
583  * @block_count:	DVBv5 API statistics: block count
584  *
585  * NOTE: derivated statistics like Uncorrected Error blocks (UCE) are
586  * calculated on userspace.
587  *
588  * Only a subset of the properties are needed for a given delivery system.
589  * For more info, consult the media_api.html with the documentation of the
590  * Userspace API.
591  */
592 struct dtv_frontend_properties {
593 	u32			frequency;
594 	enum fe_modulation	modulation;
595 
596 	enum fe_sec_voltage	voltage;
597 	enum fe_sec_tone_mode	sectone;
598 	enum fe_spectral_inversion inversion;
599 	enum fe_code_rate	fec_inner;
600 	enum fe_transmit_mode	transmission_mode;
601 	u32			bandwidth_hz;	/* 0 = AUTO */
602 	enum fe_guard_interval	guard_interval;
603 	enum fe_hierarchy	hierarchy;
604 	u32			symbol_rate;
605 	enum fe_code_rate	code_rate_HP;
606 	enum fe_code_rate	code_rate_LP;
607 
608 	enum fe_pilot		pilot;
609 	enum fe_rolloff		rolloff;
610 
611 	enum fe_delivery_system	delivery_system;
612 
613 	enum fe_interleaving	interleaving;
614 
615 	/* ISDB-T specifics */
616 	u8			isdbt_partial_reception;
617 	u8			isdbt_sb_mode;
618 	u8			isdbt_sb_subchannel;
619 	u32			isdbt_sb_segment_idx;
620 	u32			isdbt_sb_segment_count;
621 	u8			isdbt_layer_enabled;
622 	struct {
623 	    u8			segment_count;
624 	    enum fe_code_rate	fec;
625 	    enum fe_modulation	modulation;
626 	    u8			interleaving;
627 	} layer[3];
628 
629 	/* Multistream specifics */
630 	u32			stream_id;
631 
632 	/* Physical Layer Scrambling specifics */
633 	u32			scrambling_sequence_index;
634 
635 	/* ATSC-MH specifics */
636 	u8			atscmh_fic_ver;
637 	u8			atscmh_parade_id;
638 	u8			atscmh_nog;
639 	u8			atscmh_tnog;
640 	u8			atscmh_sgn;
641 	u8			atscmh_prc;
642 
643 	u8			atscmh_rs_frame_mode;
644 	u8			atscmh_rs_frame_ensemble;
645 	u8			atscmh_rs_code_mode_pri;
646 	u8			atscmh_rs_code_mode_sec;
647 	u8			atscmh_sccc_block_mode;
648 	u8			atscmh_sccc_code_mode_a;
649 	u8			atscmh_sccc_code_mode_b;
650 	u8			atscmh_sccc_code_mode_c;
651 	u8			atscmh_sccc_code_mode_d;
652 
653 	u32			lna;
654 
655 	/* statistics data */
656 	struct dtv_fe_stats	strength;
657 	struct dtv_fe_stats	cnr;
658 	struct dtv_fe_stats	pre_bit_error;
659 	struct dtv_fe_stats	pre_bit_count;
660 	struct dtv_fe_stats	post_bit_error;
661 	struct dtv_fe_stats	post_bit_count;
662 	struct dtv_fe_stats	block_error;
663 	struct dtv_fe_stats	block_count;
664 };
665 
666 #define DVB_FE_NO_EXIT  0
667 #define DVB_FE_NORMAL_EXIT      1
668 #define DVB_FE_DEVICE_REMOVED   2
669 #define DVB_FE_DEVICE_RESUME    3
670 
671 /**
672  * struct dvb_frontend - Frontend structure to be used on drivers.
673  *
674  * @refcount:		refcount to keep track of &struct dvb_frontend
675  *			references
676  * @ops:		embedded &struct dvb_frontend_ops
677  * @dvb:		pointer to &struct dvb_adapter
678  * @demodulator_priv:	demod private data
679  * @tuner_priv:		tuner private data
680  * @frontend_priv:	frontend private data
681  * @sec_priv:		SEC private data
682  * @analog_demod_priv:	Analog demod private data
683  * @dtv_property_cache:	embedded &struct dtv_frontend_properties
684  * @callback:		callback function used on some drivers to call
685  *			either the tuner or the demodulator.
686  * @id:			Frontend ID
687  * @exit:		Used to inform the DVB core that the frontend
688  *			thread should exit (usually, means that the hardware
689  *			got disconnected.
690  */
691 
692 struct dvb_frontend {
693 	struct kref refcount;
694 	struct dvb_frontend_ops ops;
695 	struct dvb_adapter *dvb;
696 	void *demodulator_priv;
697 	void *tuner_priv;
698 	void *frontend_priv;
699 	void *sec_priv;
700 	void *analog_demod_priv;
701 	struct dtv_frontend_properties dtv_property_cache;
702 #define DVB_FRONTEND_COMPONENT_TUNER 0
703 #define DVB_FRONTEND_COMPONENT_DEMOD 1
704 	int (*callback)(void *adapter_priv, int component, int cmd, int arg);
705 	int id;
706 	unsigned int exit;
707 };
708 
709 /**
710  * dvb_register_frontend() - Registers a DVB frontend at the adapter
711  *
712  * @dvb: pointer to &struct dvb_adapter
713  * @fe: pointer to &struct dvb_frontend
714  *
715  * Allocate and initialize the private data needed by the frontend core to
716  * manage the frontend and calls dvb_register_device() to register a new
717  * frontend. It also cleans the property cache that stores the frontend
718  * parameters and selects the first available delivery system.
719  */
720 int dvb_register_frontend(struct dvb_adapter *dvb,
721 				 struct dvb_frontend *fe);
722 
723 /**
724  * dvb_unregister_frontend() - Unregisters a DVB frontend
725  *
726  * @fe: pointer to &struct dvb_frontend
727  *
728  * Stops the frontend kthread, calls dvb_unregister_device() and frees the
729  * private frontend data allocated by dvb_register_frontend().
730  *
731  * NOTE: This function doesn't frees the memory allocated by the demod,
732  * by the SEC driver and by the tuner. In order to free it, an explicit call to
733  * dvb_frontend_detach() is needed, after calling this function.
734  */
735 int dvb_unregister_frontend(struct dvb_frontend *fe);
736 
737 /**
738  * dvb_frontend_detach() - Detaches and frees frontend specific data
739  *
740  * @fe: pointer to &struct dvb_frontend
741  *
742  * This function should be called after dvb_unregister_frontend(). It
743  * calls the SEC, tuner and demod release functions:
744  * &dvb_frontend_ops.release_sec, &dvb_frontend_ops.tuner_ops.release,
745  * &dvb_frontend_ops.analog_ops.release and &dvb_frontend_ops.release.
746  *
747  * If the driver is compiled with %CONFIG_MEDIA_ATTACH, it also decreases
748  * the module reference count, needed to allow userspace to remove the
749  * previously used DVB frontend modules.
750  */
751 void dvb_frontend_detach(struct dvb_frontend *fe);
752 
753 /**
754  * dvb_frontend_suspend() - Suspends a Digital TV frontend
755  *
756  * @fe: pointer to &struct dvb_frontend
757  *
758  * This function prepares a Digital TV frontend to suspend.
759  *
760  * In order to prepare the tuner to suspend, if
761  * &dvb_frontend_ops.tuner_ops.suspend\(\) is available, it calls it. Otherwise,
762  * it will call &dvb_frontend_ops.tuner_ops.sleep\(\), if available.
763  *
764  * It will also call &dvb_frontend_ops.suspend\(\) to put the demod to suspend,
765  * if available. Otherwise it will call &dvb_frontend_ops.sleep\(\).
766  *
767  * The drivers should also call dvb_frontend_suspend\(\) as part of their
768  * handler for the &device_driver.suspend\(\).
769  */
770 int dvb_frontend_suspend(struct dvb_frontend *fe);
771 
772 /**
773  * dvb_frontend_resume() - Resumes a Digital TV frontend
774  *
775  * @fe: pointer to &struct dvb_frontend
776  *
777  * This function resumes the usual operation of the tuner after resume.
778  *
779  * In order to resume the frontend, it calls the demod
780  * &dvb_frontend_ops.resume\(\) if available. Otherwise it calls demod
781  * &dvb_frontend_ops.init\(\).
782  *
783  * If &dvb_frontend_ops.tuner_ops.resume\(\) is available, It, it calls it.
784  * Otherwise,t will call &dvb_frontend_ops.tuner_ops.init\(\), if available.
785  *
786  * Once tuner and demods are resumed, it will enforce that the SEC voltage and
787  * tone are restored to their previous values and wake up the frontend's
788  * kthread in order to retune the frontend.
789  *
790  * The drivers should also call dvb_frontend_resume() as part of their
791  * handler for the &device_driver.resume\(\).
792  */
793 int dvb_frontend_resume(struct dvb_frontend *fe);
794 
795 /**
796  * dvb_frontend_reinitialise() - forces a reinitialisation at the frontend
797  *
798  * @fe: pointer to &struct dvb_frontend
799  *
800  * Calls &dvb_frontend_ops.init\(\) and &dvb_frontend_ops.tuner_ops.init\(\),
801  * and resets SEC tone and voltage (for Satellite systems).
802  *
803  * NOTE: Currently, this function is used only by one driver (budget-av).
804  * It seems to be due to address some special issue with that specific
805  * frontend.
806  */
807 void dvb_frontend_reinitialise(struct dvb_frontend *fe);
808 
809 /**
810  * dvb_frontend_sleep_until() - Sleep for the amount of time given by
811  *                      add_usec parameter
812  *
813  * @waketime: pointer to &struct ktime_t
814  * @add_usec: time to sleep, in microseconds
815  *
816  * This function is used to measure the time required for the
817  * FE_DISHNETWORK_SEND_LEGACY_CMD() ioctl to work. It needs to be as precise
818  * as possible, as it affects the detection of the dish tone command at the
819  * satellite subsystem.
820  *
821  * Its used internally by the DVB frontend core, in order to emulate
822  * FE_DISHNETWORK_SEND_LEGACY_CMD() using the &dvb_frontend_ops.set_voltage\(\)
823  * callback.
824  *
825  * NOTE: it should not be used at the drivers, as the emulation for the
826  * legacy callback is provided by the Kernel. The only situation where this
827  * should be at the drivers is when there are some bugs at the hardware that
828  * would prevent the core emulation to work. On such cases, the driver would
829  * be writing a &dvb_frontend_ops.dishnetwork_send_legacy_command\(\) and
830  * calling this function directly.
831  */
832 void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec);
833 
834 #endif
835