cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vidtv_demod.h (2105B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * The Virtual DTV test driver serves as a reference DVB driver and helps
      4 * validate the existing APIs in the media subsystem. It can also aid
      5 * developers working on userspace applications.
      6 *
      7 * Copyright (C) 2020 Daniel W. S. Almeida
      8 * Based on the example driver written by Emard <emard@softhome.net>
      9 */
     10
     11#ifndef VIDTV_DEMOD_H
     12#define VIDTV_DEMOD_H
     13
     14#include <linux/dvb/frontend.h>
     15
     16#include <media/dvb_frontend.h>
     17
     18/**
     19 * struct vidtv_demod_cnr_to_qual_s - Map CNR values to a given combination of
     20 * modulation and fec_inner
     21 * @modulation: see enum fe_modulation
     22 * @fec: see enum fe_fec_rate
     23 * @cnr_ok: S/N threshold to consider the signal as OK. Below that, there's
     24 *          a chance of losing sync.
     25 * @cnr_good: S/N threshold to consider the signal strong.
     26 *
     27 * This struct matches values for 'good' and 'ok' CNRs given the combination
     28 * of modulation and fec_inner in use. We might simulate some noise if the
     29 * signal quality is not too good.
     30 *
     31 * The values were taken from libdvbv5.
     32 */
     33struct vidtv_demod_cnr_to_qual_s {
     34	u32 modulation;
     35	u32 fec;
     36	u32 cnr_ok;
     37	u32 cnr_good;
     38};
     39
     40/**
     41 * struct vidtv_demod_config - Configuration used to init the demod
     42 * @drop_tslock_prob_on_low_snr: probability of losing the lock due to low snr
     43 * @recover_tslock_prob_on_good_snr: probability of recovering when the signal
     44 * improves
     45 *
     46 * The configuration used to init the demodulator module, usually filled
     47 * by a bridge driver. For vidtv, this is filled by vidtv_bridge before the
     48 * demodulator module is probed.
     49 */
     50struct vidtv_demod_config {
     51	u8 drop_tslock_prob_on_low_snr;
     52	u8 recover_tslock_prob_on_good_snr;
     53};
     54
     55/**
     56 * struct vidtv_demod_state - The demodulator state
     57 * @frontend: The frontend structure allocated by the demod.
     58 * @config: The config used to init the demod.
     59 * @status: the demod status.
     60 * @tuner_cnr: current S/N ratio for the signal carrier
     61 */
     62struct vidtv_demod_state {
     63	struct dvb_frontend frontend;
     64	struct vidtv_demod_config config;
     65	enum fe_status status;
     66	u16 tuner_cnr;
     67};
     68#endif // VIDTV_DEMOD_H