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Abdelkader Boudih
dd56711e83
No functional change. Reviewed by: adrian Differential Revision: https://reviews.freebsd.org/D58311
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*
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* Copyright (c) 2026 Abdelkader Boudih <[email protected]>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#ifndef _DEV_FIREWIRE_FWISOUND_H_
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#define _DEV_FIREWIRE_FWISOUND_H_
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#include <dev/firewire/fwcam.h>
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/* Protocol reverse-engineered by Clemens Ladisch (Linux isight-firmware). */
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#define FWISOUND_SPEC_ID APPLE_FW_OUI
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#define FWISOUND_VERSION 0x000010 /* SW_ISIGHT_AUDIO */
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#define APPLE_FW_OUI 0x000a27
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/* Audio register offsets from audio_base */
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#define FWISOUND_REG_AUDIO_ENABLE 0x000 /* bit31 = enable streaming */
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#define FWISOUND_REG_DEF_AUDIO_GAIN 0x204
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#define FWISOUND_REG_GAIN_RAW_START 0x210
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#define FWISOUND_REG_GAIN_RAW_END 0x214
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#define FWISOUND_REG_GAIN_DB_START 0x218
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#define FWISOUND_REG_GAIN_DB_END 0x21c
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#define FWISOUND_REG_SAMPLE_RATE_INQ 0x280
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#define FWISOUND_REG_ISO_TX_CONFIG 0x300 /* bits[19:16]=speed, [3:0]=ch*/
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#define FWISOUND_REG_SAMPLE_RATE 0x400 /* bit31 = 1 → 48000 Hz */
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#define FWISOUND_REG_GAIN 0x500
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#define FWISOUND_REG_MUTE 0x504
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/* REG_AUDIO_ENABLE / REG_SAMPLE_RATE bit */
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#define FWISOUND_AUDIO_ENABLE (1u << 31)
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#define FWISOUND_RATE_48000 (1u << 31)
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#define FWISOUND_MAX_SAMPLES 475 /* max samples per ISO packet */
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#define FWISOUND_SIGNATURE 0x73676874u /* "sght" */
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/* Apple FireWire audio ISO payload. */
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struct fwisound_payload {
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uint32_t sample_count; /* samples in this packet */
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uint32_t signature; /* 0x73676874 = "sght" */
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uint32_t sample_total; /* running total (drop detect)*/
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uint32_t reserved;
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int16_t samples[2 * FWISOUND_MAX_SAMPLES]; /* stereo S16BE */
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};
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/* ISO DMA parameters */
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#define FWISOUND_ISO_CHANNEL 1
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#define FWISOUND_ISO_NCHUNK 64
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#define FWISOUND_ISO_PKTSIZE 2048 /* MCLBYTES */
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/* Driver states */
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#define FWISOUND_STATE_IDLE 0
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#define FWISOUND_STATE_PROBED 1
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#define FWISOUND_STATE_STREAMING 2
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#define FWISOUND_STATE_DETACHING 3
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#ifdef _KERNEL
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#include <dev/sound/pcm/sound.h>
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struct fwisound_chan {
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struct fwisound_softc *sc;
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struct pcm_channel *pcm_chan;
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struct snd_dbuf *buf;
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struct pcmchan_caps caps;
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uint32_t fmts[2];
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uint32_t hw_ptr; /* ring write offset (bytes) */
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int running;
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};
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struct fwisound_softc {
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struct firewire_dev_comm fd; /* MUST BE FIRST */
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struct mtx mtx;
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device_t dev;
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device_t pcm_dev;
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struct fw_device *fwdev;
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uint16_t cmd_hi; /* always 0xffff */
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uint32_t cmd_lo; /* 0xf0000000|(audio_base<<2) */
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struct task probe_task;
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struct task start_task; /* deferred iso_start */
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struct task stop_task; /* deferred iso_stop */
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/* ISO streaming */
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int dma_ch; /* -1 = not open */
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int iso_active; /* iso_input running */
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uint8_t iso_channel;
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/* PCM channel back-reference */
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struct fwisound_chan *chan;
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/* Sample drop detection */
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uint32_t sample_total;
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/* Gain range (read from camera during probe) */
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int32_t gain_raw_min;
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int32_t gain_raw_max;
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int state;
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int dropped;
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};
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#define FWISOUND_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define FWISOUND_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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int fwisound_iso_start(struct fwisound_softc *);
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void fwisound_iso_stop(struct fwisound_softc *);
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#endif /* _KERNEL */
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#endif /* _DEV_FIREWIRE_FWISOUND_H_ */
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