/*
 * dvb_frontend.h
 *
 * 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 "dvbdev.h"

/**
 * DOC: Digital TV Frontend
 *
 * The Digital TV Frontend kABI defines a driver-internal interface for
 * registering low-level, hardware specific driver to a hardware independent
 * frontend layer. It is only of interest for Digital TV device driver writers.
 * The header file for this API is named dvb_frontend.h and located in
 * drivers/media/dvb-core.
 *
 * Before using the Digital TV frontend core, the bridge driver should attach
 * the frontend demod, tuner and SEC devices and call dvb_register_frontend(),
 * in order to register the new frontend at the subsystem. At device
 * detach/removal, the bridge driver should call dvb_unregister_frontend() to
 * remove the frontend from the core and then dvb_frontend_detach() to free the
 * memory allocated by the frontend drivers.
 *
 * The drivers should also call dvb_frontend_suspend() as part of their
 * handler for the &device_driver.suspend(), and dvb_frontend_resume() as
 * part of their handler for &device_driver.resume().
 *
 * A few other optional functions are provided to handle some special cases.
 */

/*
 * 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 dettached.
 *                      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 @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 strengh. Used mostly to support
 *                      analog TV and radio. Digital TV should report, instead,
 *                      via DVBv5 API (@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;

        int (*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 dettached.
 *                      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
 * @release:            callback function called when frontend is dettached.
 *                      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
 *                      @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
 *                      @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
 * @set_property:       callback function to allow the frontend to validade
 *                      incoming properties. Should not be used on new drivers.
 * @get_property:       callback function to allow the frontend to override
 *                      outcoming properties. Should not be used on new drivers.
 */
struct dvb_frontend_ops {

        struct dvb_frontend_info info;

        u8 delsys[MAX_DELSYS];

        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;

        int (*set_property)(struct dvb_frontend* fe, struct dtv_property* tvp);
        int (*get_property)(struct dvb_frontend* fe, struct dtv_property* tvp);
};

#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).
 * @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;

        /* 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;

        /* private: */
        /* Cache State */
        u32                     state;

};

#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.
 *
 * @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 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 the dvb adapter
 * @fe: pointer to the frontend struct
 *
 * 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 the frontend struct
 *
 * 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 the frontend struct
 *
 * 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 the frontend struct
 *
 * 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 the frontend struct
 *
 * 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 the frontend struct
 *
 * 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 a 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