linux/sound/firewire/motu/motu-command-dsp-message-parser.c

// SPDX-License-Identifier: GPL-2.0-only
//
// motu-command-dsp-message-parser.c - a part of driver for MOTU FireWire series
//
// Copyright (c) 2021 Takashi Sakamoto <[email protected]>

// Below models allow software to configure their DSP function by command transferred in
// asynchronous transaction:
//  * 828 mk3 (FireWire only and Hybrid)
//  * 896 mk3 (FireWire only and Hybrid)
//  * Ultralite mk3 (FireWire only and Hybrid)
//  * Traveler mk3
//  * Track 16
//
// Isochronous packets from the above models includes messages to report state of hardware meter.

#include "motu.h"

enum msg_parser_state { … };

struct msg_parser { … };

int snd_motu_command_dsp_message_parser_new(struct snd_motu *motu)
{ … }

int snd_motu_command_dsp_message_parser_init(struct snd_motu *motu, enum cip_sfc sfc)
{ … }

#define FRAGMENT_POS …
#define MIDI_BYTE_POS …
#define MIDI_FLAG_POS …
// One value of hardware meter consists of 4 messages.
#define FRAGMENTS_PER_VALUE …
#define VALUES_AT_IMAGE_END …

void snd_motu_command_dsp_message_parser_parse(const struct amdtp_stream *s,
					const struct pkt_desc *desc, unsigned int count)
{ … }

void snd_motu_command_dsp_message_parser_copy_meter(struct snd_motu *motu,
					struct snd_firewire_motu_command_dsp_meter *meter)
{ … }