root/include/uapi/sound/firewire.h

#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

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 */
};

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;
};


#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_TYPE_DICE        1
#define SNDRV_FIREWIRE_TYPE_FIREWORKS   2
#define SNDRV_FIREWIRE_TYPE_BEBOB       3
/* AV/C, RME, MOTU, ... */

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.
 */

#endif /* _UAPI_SOUND_FIREWIRE_H_INCLUDED */