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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_SOUND_FIREWIRE_H_INCLUDED
#define _UAPI_SOUND_FIREWIRE_H_INCLUDED
#include <linux/ioctl.h>
#include <linux/types.h>
/* events can be read() from the hwdep device */
#define SNDRV_FIREWIRE_EVENT_LOCK_STATUS 0x000010cc
#define SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION 0xd1ce004e
#define SNDRV_FIREWIRE_EVENT_EFW_RESPONSE 0x4e617475
#define SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE 0x746e736c
#define SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION 0x64776479
#define SNDRV_FIREWIRE_EVENT_TASCAM_CONTROL 0x7473636d
struct snd_firewire_event_common {
unsigned int type; /* SNDRV_FIREWIRE_EVENT_xxx */
};
struct snd_firewire_event_lock_status {
unsigned int type;
unsigned int status; /* 0/1 = unlocked/locked */
};
struct snd_firewire_event_dice_notification {
unsigned int type;
unsigned int notification; /* DICE-specific bits */
};
#define SND_EFW_TRANSACTION_USER_SEQNUM_MAX ((__u32)((__u16)~0) - 1)
/* each field should be in big endian */
struct snd_efw_transaction {
__be32 length;
__be32 version;
__be32 seqnum;
__be32 category;
__be32 command;
__be32 status;
__be32 params[0];
};
struct snd_firewire_event_efw_response {
unsigned int type;
__be32 response[0]; /* some responses */
};
struct snd_firewire_event_digi00x_message {
unsigned int type;
__u32 message; /* Digi00x-specific message */
};
struct snd_firewire_event_motu_notification {
unsigned int type;
__u32 message; /* MOTU-specific bits. */
};
struct snd_firewire_tascam_change {
unsigned int index;
__be32 before;
__be32 after;
};
struct snd_firewire_event_tascam_control {
unsigned int type;
struct snd_firewire_tascam_change changes[0];
};
union snd_firewire_event {
struct snd_firewire_event_common common;
struct snd_firewire_event_lock_status lock_status;
struct snd_firewire_event_dice_notification dice_notification;
struct snd_firewire_event_efw_response efw_response;
struct snd_firewire_event_digi00x_message digi00x_message;
struct snd_firewire_event_tascam_control tascam_control;
struct snd_firewire_event_motu_notification motu_notification;
};
#define SNDRV_FIREWIRE_IOCTL_GET_INFO _IOR('H', 0xf8, struct snd_firewire_get_info)
#define SNDRV_FIREWIRE_IOCTL_LOCK _IO('H', 0xf9)
#define SNDRV_FIREWIRE_IOCTL_UNLOCK _IO('H', 0xfa)
#define SNDRV_FIREWIRE_IOCTL_TASCAM_STATE _IOR('H', 0xfb, struct snd_firewire_tascam_state)
#define SNDRV_FIREWIRE_IOCTL_MOTU_REGISTER_DSP_METER _IOR('H', 0xfc, struct snd_firewire_motu_register_dsp_meter)
#define SNDRV_FIREWIRE_IOCTL_MOTU_COMMAND_DSP_METER _IOR('H', 0xfd, struct snd_firewire_motu_command_dsp_meter)
#define SNDRV_FIREWIRE_TYPE_DICE 1
#define SNDRV_FIREWIRE_TYPE_FIREWORKS 2
#define SNDRV_FIREWIRE_TYPE_BEBOB 3
#define SNDRV_FIREWIRE_TYPE_OXFW 4
#define SNDRV_FIREWIRE_TYPE_DIGI00X 5
#define SNDRV_FIREWIRE_TYPE_TASCAM 6
#define SNDRV_FIREWIRE_TYPE_MOTU 7
#define SNDRV_FIREWIRE_TYPE_FIREFACE 8
struct snd_firewire_get_info {
unsigned int type; /* SNDRV_FIREWIRE_TYPE_xxx */
unsigned int card; /* same as fw_cdev_get_info.card */
unsigned char guid[8];
char device_name[16]; /* device node in /dev */
};
/*
* SNDRV_FIREWIRE_IOCTL_LOCK prevents the driver from streaming.
* Returns -EBUSY if the driver is already streaming.
*/
#define SNDRV_FIREWIRE_TASCAM_STATE_COUNT 64
struct snd_firewire_tascam_state {
__be32 data[SNDRV_FIREWIRE_TASCAM_STATE_COUNT];
};
// In below MOTU models, software is allowed to control their DSP by accessing to registers.
// - 828mk2
// - 896hd
// - Traveler
// - 8 pre
// - Ultralite
// - 4 pre
// - Audio Express
//
// On the other hand, the status of DSP is split into specific messages included in the sequence of
// isochronous packet. ALSA firewire-motu driver gathers the messages and allow userspace applications
// to read it via ioctl. In 828mk2, 896hd, and Traveler, hardware meter for all of physical inputs
// are put into the message, while one pair of physical outputs is selected. The selection is done by
// LSB one byte in asynchronous write quadlet transaction to 0x'ffff'f000'0b2c.
//
// I note that V3HD/V4HD uses asynchronous transaction for the purpose. The destination address is
// registered to 0x'ffff'f000'0b38 and '0b3c by asynchronous write quadlet request. The size of
// message differs between 23 and 51 quadlets. For the case, the number of mixer bus can be extended
// up to 12.
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT 40
/**
* struct snd_firewire_motu_register_dsp_meter - the container for meter information in DSP
* controlled by register access
* @data: Signal level meters. The mapping between position and input/output channel is
* model-dependent.
*
* The structure expresses the part of DSP status for hardware meter. The u8 storage includes linear
* value for audio signal level between 0x00 and 0x7f.
*/
struct snd_firewire_motu_register_dsp_meter {
__u8 data[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT];
};
// In below MOTU models, software is allowed to control their DSP by command in frame of
// asynchronous transaction to 0x'ffff'0001'0000:
//
// - 828 mk3 (FireWire only and Hybrid)
// - 896 mk3 (FireWire only and Hybrid)
// - Ultralite mk3 (FireWire only and Hybrid)
// - Traveler mk3
// - Track 16
//
// On the other hand, the states of hardware meter is split into specific messages included in the
// sequence of isochronous packet. ALSA firewire-motu driver gathers the message and allow userspace
// application to read it via ioctl.
#define SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT 400
/**
* struct snd_firewire_motu_command_dsp_meter - the container for meter information in DSP
* controlled by command
* @data: Signal level meters. The mapping between position and signal channel is model-dependent.
*
* The structure expresses the part of DSP status for hardware meter. The 32 bit storage is
* estimated to include IEEE 764 32 bit single precision floating point (binary32) value. It is
* expected to be linear value (not logarithm) for audio signal level between 0.0 and +1.0. However,
* the last two quadlets (data[398] and data[399]) are filled with 0xffffffff since they are the
* marker of one period.
*/
struct snd_firewire_motu_command_dsp_meter {
__u32 data[SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT];
};
#endif /* _UAPI_SOUND_FIREWIRE_H_INCLUDED */
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