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linux/include/uapi/sound/firewire.h
Takashi Sakamoto 0d9eb7ed95 ALSA: fireface: add field for the number of messages copied to user space 
Current structure includes no field to express the number of messages
copied to user space, thus user space application needs to information
out of the structure to parse the content of structure.

This commit adds a field to express the number of messages copied to user
space since It is more preferable to use self-contained structure.

Kees Cook proposed an idea of annotation for bound of flexible arrays
in his future improvement for flexible-length array in kernel. The
additional field for message count is suitable to the idea as well.

Reference: https://people.kernel.org/kees/bounded-flexible-arrays-in-c
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230202133708.163936-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-02-04 09:35:17 +01:00

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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
#define SNDRV_FIREWIRE_EVENT_MOTU_REGISTER_DSP_CHANGE 0x4d545244
#define SNDRV_FIREWIRE_EVENT_FF400_MESSAGE 0x4f6c6761
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[];
};
struct snd_firewire_event_efw_response {
unsigned int type;
__be32 response[]; /* 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[];
};
struct snd_firewire_event_motu_register_dsp_change {
unsigned int type;
__u32 count; /* The number of changes. */
__u32 changes[]; /* Encoded event for change of register DSP. */
};
/**
* struct snd_firewire_event_ff400_message - the container for message from Fireface 400 when
* operating hardware knob.
*
* @type: Fixed to SNDRV_FIREWIRE_EVENT_FF400_MESSAGE.
* @message_count: The number of messages.
* @messages.message: The messages expressing hardware knob operation.
* @messages.tstamp: The isochronous cycle at which the request subaction of asynchronous
* transaction was sent to deliver the message. It has 16 bit unsigned integer
* value. The higher 3 bits of value expresses the lower three bits of second
* field in the format of CYCLE_TIME, up to 7. The rest 13 bits expresses cycle
* field up to 7999.
*
* The structure expresses message transmitted by Fireface 400 when operating hardware knob.
*/
struct snd_firewire_event_ff400_message {
unsigned int type;
unsigned int message_count;
struct {
__u32 message;
__u32 tstamp;
} messages[];
};
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;
struct snd_firewire_event_motu_register_dsp_change motu_register_dsp_change;
struct snd_firewire_event_ff400_message ff400_message;
};
#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_IOCTL_MOTU_REGISTER_DSP_PARAMETER _IOR('H', 0xfe, struct snd_firewire_motu_register_dsp_parameter)
#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_INPUT_COUNT 24
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_OUTPUT_COUNT 24
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT \
(SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT + SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_OUTPUT_COUNT)
/**
* 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];
};
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT 4
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT 20
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT 10
#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT (SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT + 2)
/**
* snd_firewire_motu_register_dsp_parameter - the container for parameters of DSP controlled
* by register access.
* @mixer.source.gain: The gain of source to mixer.
* @mixer.source.pan: The L/R balance of source to mixer.
* @mixer.source.flag: The flag of source to mixer, including mute, solo.
* @mixer.source.paired_balance: The L/R balance of paired source to mixer, only for 4 pre and
* Audio Express.
* @mixer.source.paired_width: The width of paired source to mixer, only for 4 pre and
* Audio Express.
* @mixer.output.paired_volume: The volume of paired output from mixer.
* @mixer.output.paired_flag: The flag of paired output from mixer.
* @output.main_paired_volume: The volume of paired main output.
* @output.hp_paired_volume: The volume of paired hp output.
* @output.hp_paired_assignment: The source assigned to paired hp output.
* @output.reserved: Padding for 32 bit alignment for future extension.
* @line_input.boost_flag: The flags of boost for line inputs, only for 828mk2 and Traveler.
* @line_input.nominal_level_flag: The flags of nominal level for line inputs, only for 828mk2 and
* Traveler.
* @line_input.reserved: Padding for 32 bit alignment for future extension.
* @input.gain_and_invert: The value including gain and invert for input, only for Ultralite, 4 pre
* and Audio Express.
* @input.flag: The flag of input; e.g. jack detection, phantom power, and pad, only for Ultralite,
* 4 pre and Audio express.
* @reserved: Padding so that the size of structure is kept to 512 byte, but for future extension.
*
* The structure expresses the set of parameters for DSP controlled by register access.
*/
struct snd_firewire_motu_register_dsp_parameter {
struct {
struct {
__u8 gain[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
__u8 pan[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
__u8 flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
__u8 paired_balance[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
__u8 paired_width[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
} source[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
struct {
__u8 paired_volume[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
__u8 paired_flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
} output;
} mixer;
struct {
__u8 main_paired_volume;
__u8 hp_paired_volume;
__u8 hp_paired_assignment;
__u8 reserved[5];
} output;
struct {
__u8 boost_flag;
__u8 nominal_level_flag;
__u8 reserved[6];
} line_input;
struct {
__u8 gain_and_invert[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT];
__u8 flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT];
} input;
__u8 reserved[64];
};
/*
* 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.
*/
struct snd_firewire_motu_command_dsp_meter {
#ifdef __KERNEL__
__u32 data[SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT];
#else
float data[SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT];
#endif
};
#endif /* _UAPI_SOUND_FIREWIRE_H_INCLUDED */
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