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/*
* Copyright (c) 2026 Abdelkader Boudih <freebsd@seuros.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#ifndef _DEV_FIREWIRE_FWISOUND_H_
#define _DEV_FIREWIRE_FWISOUND_H_
#include <dev/firewire/fwcam.h>
/* Protocol reverse-engineered by Clemens Ladisch (Linux isight-firmware). */
#define FWISOUND_SPEC_ID APPLE_FW_OUI
#define FWISOUND_VERSION 0x000010 /* SW_ISIGHT_AUDIO */
#define APPLE_FW_OUI 0x000a27
/* Audio register offsets from audio_base */
#define FWISOUND_REG_AUDIO_ENABLE 0x000 /* bit31 = enable streaming */
#define FWISOUND_REG_DEF_AUDIO_GAIN 0x204
#define FWISOUND_REG_GAIN_RAW_START 0x210
#define FWISOUND_REG_GAIN_RAW_END 0x214
#define FWISOUND_REG_GAIN_DB_START 0x218
#define FWISOUND_REG_GAIN_DB_END 0x21c
#define FWISOUND_REG_SAMPLE_RATE_INQ 0x280
#define FWISOUND_REG_ISO_TX_CONFIG 0x300 /* bits[19:16]=speed, [3:0]=ch*/
#define FWISOUND_REG_SAMPLE_RATE 0x400 /* bit31 = 1 → 48000 Hz */
#define FWISOUND_REG_GAIN 0x500
#define FWISOUND_REG_MUTE 0x504
/* REG_AUDIO_ENABLE / REG_SAMPLE_RATE bit */
#define FWISOUND_AUDIO_ENABLE (1u << 31)
#define FWISOUND_RATE_48000 (1u << 31)
#define FWISOUND_MAX_SAMPLES 475 /* max samples per ISO packet */
#define FWISOUND_SIGNATURE 0x73676874u /* "sght" */
/* Apple FireWire audio ISO payload. */
struct fwisound_payload {
uint32_t sample_count; /* samples in this packet */
uint32_t signature; /* 0x73676874 = "sght" */
uint32_t sample_total; /* running total (drop detect)*/
uint32_t reserved;
int16_t samples[2 * FWISOUND_MAX_SAMPLES]; /* stereo S16BE */
};
/* ISO DMA parameters */
#define FWISOUND_ISO_CHANNEL 1
#define FWISOUND_ISO_NCHUNK 64
#define FWISOUND_ISO_PKTSIZE 2048 /* MCLBYTES */
/* Driver states */
#define FWISOUND_STATE_IDLE 0
#define FWISOUND_STATE_PROBED 1
#define FWISOUND_STATE_STREAMING 2
#define FWISOUND_STATE_DETACHING 3
#ifdef _KERNEL
#include <dev/sound/pcm/sound.h>
struct fwisound_chan {
struct fwisound_softc *sc;
struct pcm_channel *pcm_chan;
struct snd_dbuf *buf;
struct pcmchan_caps caps;
uint32_t fmts[2];
uint32_t hw_ptr; /* ring write offset (bytes) */
int running;
};
struct fwisound_softc {
struct firewire_dev_comm fd; /* MUST BE FIRST */
struct mtx mtx;
device_t dev;
device_t pcm_dev;
struct fw_device *fwdev;
uint16_t cmd_hi; /* always 0xffff */
uint32_t cmd_lo; /* 0xf0000000|(audio_base<<2) */
struct task probe_task;
struct task start_task; /* deferred iso_start */
struct task stop_task; /* deferred iso_stop */
/* ISO streaming */
int dma_ch; /* -1 = not open */
int iso_active; /* iso_input running */
uint8_t iso_channel;
/* PCM channel back-reference */
struct fwisound_chan *chan;
/* Sample drop detection */
uint32_t sample_total;
/* Gain range (read from camera during probe) */
int32_t gain_raw_min;
int32_t gain_raw_max;
int state;
int dropped;
};
#define FWISOUND_LOCK(sc) mtx_lock(&(sc)->mtx)
#define FWISOUND_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
int fwisound_iso_start(struct fwisound_softc *);
void fwisound_iso_stop(struct fwisound_softc *);
#endif /* _KERNEL */
#endif /* _DEV_FIREWIRE_FWISOUND_H_ */
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