diff options
Diffstat (limited to 'drivers/media/test-drivers/vidtv/vidtv_demod.h')
| -rw-r--r-- | drivers/media/test-drivers/vidtv/vidtv_demod.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.h b/drivers/media/test-drivers/vidtv/vidtv_demod.h new file mode 100644 index 000000000000..dfb36c515e4d --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * The Virtual DTV test driver serves as a reference DVB driver and helps + * validate the existing APIs in the media subsystem. It can also aid + * developers working on userspace applications. + * + * Copyright (C) 2020 Daniel W. S. Almeida + * Based on the example driver written by Emard <emard@softhome.net> + */ + +#ifndef VIDTV_DEMOD_H +#define VIDTV_DEMOD_H + +#include <linux/dvb/frontend.h> +#include <media/dvb_frontend.h> + +/** + * struct vidtv_demod_cnr_to_qual_s - Map CNR values to a given combination of + * modulation and fec_inner + * @modulation: see enum fe_modulation + * @fec: see enum fe_fec_rate + * + * This struct matches values for 'good' and 'ok' CNRs given the combination + * of modulation and fec_inner in use. We might simulate some noise if the + * signal quality is not too good. + * + * The values were taken from libdvbv5. + */ +struct vidtv_demod_cnr_to_qual_s { + u32 modulation; + u32 fec; + u32 cnr_ok; + u32 cnr_good; +}; + +/** + * struct vidtv_demod_config - Configuration used to init the demod + * @drop_tslock_prob_on_low_snr: probability of losing the lock due to low snr + * @recover_tslock_prob_on_good_snr: probability of recovering when the signal + * improves + * + * The configuration used to init the demodulator module, usually filled + * by a bridge driver. For vidtv, this is filled by vidtv_bridge before the + * demodulator module is probed. + */ +struct vidtv_demod_config { + u8 drop_tslock_prob_on_low_snr; + u8 recover_tslock_prob_on_good_snr; +}; + +/** + * struct vidtv_demod_state - The demodulator state + * @frontend: The frontend structure allocated by the demod. + * @config: The config used to init the demod. + * @poll_snr: The task responsible for periodically checking the simulated + * signal quality, eventually dropping or reacquiring the TS lock. + * @status: the demod status. + * @cold_start: Whether the demod has not been init yet. + * @poll_snr_thread_running: Whether the task responsible for periodically + * checking the simulated signal quality is running. + * @poll_snr_thread_restart: Whether we should restart the poll_snr task. + */ +struct vidtv_demod_state { + struct dvb_frontend frontend; + struct vidtv_demod_config config; + struct delayed_work poll_snr; + enum fe_status status; + u16 tuner_cnr; + bool cold_start; + bool poll_snr_thread_running; + bool poll_snr_thread_restart; +}; +#endif // VIDTV_DEMOD_H |