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Subject: RE: [virtio-dev] Request for a new device number for a virtio-audio device.
Hi all,
I updated the header file according to the comments and overall flow of the discussion (see attachment). Also I replaced defines with enumerations and
1. Added new PCM request type for assigning particular virtual queue for particular substream.
2. Removed the rewind/forward request types, since these are actually not needed.
Looking forward for your comments.
Anton Yakovlev
Senior Software Engineer
OpenSynergy GmbH
Rotherstr. 20, 10245 Berlin
www.opensynergy.com
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/*
* Copyright (C) 2019 OpenSynergy GmbH
*
* This header is BSD licensed so anyone can use the definitions to
* implement compatible drivers/servers.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of OpenSynergy GmbH nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#ifndef VIRTIO_SND_IF_H
#define VIRTIO_SND_IF_H
#include <linux/virtio_types.h>
/*******************************************************************************
* COMMON DEFINITIONS
*/
/* a configuration space */
struct virtio_snd_config
{
/* maximum # of available virtual queues (including the control queue) */
__virtio32 nqueues;
};
/* supported function types */
enum
{
VIRTIO_SND_FN_BASE,
VIRTIO_SND_FN_PCM
};
/* supported descriptor types */
enum
{
VIRTIO_SND_DESC_PCM,
VIRTIO_SND_DESC_PCM_STREAM
};
/* supported control request types */
enum
{
/* --- base request types --- */
VIRTIO_SND_BASE_R_GET_CFG,
/* --- pcm request types --- */
VIRTIO_SND_PCM_R_GET_FEATURE = 0x1000,
VIRTIO_SND_PCM_R_SET_FEATURE,
VIRTIO_SND_PCM_R_SET_QUEUE,
VIRTIO_SND_PCM_R_SET_FORMAT,
VIRTIO_SND_PCM_R_PREPARE,
VIRTIO_SND_PCM_R_START,
VIRTIO_SND_PCM_R_STOP,
VIRTIO_SND_PCM_R_PAUSE,
VIRTIO_SND_PCM_R_UNPAUSE
};
/* supported error codes */
enum
{
/* --- generic error codes --- */
/* no errors */
VIRTIO_SND_E_SUCCESS,
/* an undefined error */
VIRTIO_SND_E_GENERAL,
/* not supported input parameter(s) */
VIRTIO_SND_E_NOTSUPPORTED,
/* invalid input parameter(s) */
VIRTIO_SND_E_INVALID,
/* I/O error */
VIRTIO_SND_E_IO,
/* --- pcm error codes --- */
VIRTIO_SND_PCM_E_NOT_READY = 0x1000
};
/* a generic request header */
struct virtio_snd_req
{
__virtio16 function;
__virtio16 request;
};
/* a generic response header */
struct virtio_snd_rsp
{
__virtio32 status; /* VIRTIO_SND_E_XXX */
};
/* a generic descriptor */
struct virtio_snd_generic_desc
{
__u8 length;
__u8 type;
__u16 padding;
};
/*******************************************************************************
* BASE FUNCTION DEFINITIONS
*/
/* a maximum possible configuration data size (in bytes) */
#define VIRTIO_SND_BASE_CFG_MAX_SIZE 1024
/* a response containing device configuration */
struct virtio_snd_base_configuration
{
struct virtio_snd_rsp hdr;
/* size in bytes of configuration data */
__virtio32 length;
/* configuration data */
__u8 data[VIRTIO_SND_BASE_CFG_MAX_SIZE];
};
/*******************************************************************************
* PCM FUNCTION DEFINITIONS
*/
/* supported PCM stream types */
enum
{
VIRTIO_SND_PCM_T_PLAYBACK,
VIRTIO_SND_PCM_T_CAPTURE
};
/* supported PCM stream features */
enum
{
VIRTIO_SND_PCM_FEAT_UPDATE_FREQUENCY,
VIRTIO_SND_PCM_FEAT_CHANNEL_MAP
};
#define VIRTIO_SND_PCM_FEATBIT(bit) (1U << VIRTIO_SND_PCM_FEAT_ ## bit)
enum
{
VIRTIO_SND_PCM_FEATBIT_UPDATE_FREQUENCY =
VIRTIO_SND_PCM_FEATBIT(UPDATE_FREQUENCY),
VIRTIO_SND_PCM_FEATBIT_CHANNEL_MAP =
VIRTIO_SND_PCM_FEATBIT(CHANNEL_MAP)
};
/* supported PCM sample formats */
enum
{
VIRTIO_SND_PCM_FMT_S8,
VIRTIO_SND_PCM_FMT_U8,
VIRTIO_SND_PCM_FMT_S16,
VIRTIO_SND_PCM_FMT_U16,
VIRTIO_SND_PCM_FMT_S24,
VIRTIO_SND_PCM_FMT_U24,
VIRTIO_SND_PCM_FMT_S32,
VIRTIO_SND_PCM_FMT_U32,
VIRTIO_SND_PCM_FMT_FLOAT,
VIRTIO_SND_PCM_FMT_FLOAT64,
VIRTIO_SND_PCM_FMT_S20,
VIRTIO_SND_PCM_FMT_U20,
VIRTIO_SND_PCM_FMT_S24_3,
VIRTIO_SND_PCM_FMT_U24_3,
VIRTIO_SND_PCM_FMT_S20_3,
VIRTIO_SND_PCM_FMT_U20_3,
VIRTIO_SND_PCM_FMT_S18_3,
VIRTIO_SND_PCM_FMT_U18_3
};
#define VIRTIO_SND_PCM_FMTBIT(bit) (1ULL << VIRTIO_SND_PCM_FMT_ ## bit)
enum
{
VIRTIO_SND_PCM_FMTBIT_S8 = VIRTIO_SND_PCM_FMTBIT(S8),
VIRTIO_SND_PCM_FMTBIT_U8 = VIRTIO_SND_PCM_FMTBIT(U8),
VIRTIO_SND_PCM_FMTBIT_S16 = VIRTIO_SND_PCM_FMTBIT(S16),
VIRTIO_SND_PCM_FMTBIT_U16 = VIRTIO_SND_PCM_FMTBIT(U16),
VIRTIO_SND_PCM_FMTBIT_S24 = VIRTIO_SND_PCM_FMTBIT(S24),
VIRTIO_SND_PCM_FMTBIT_U24 = VIRTIO_SND_PCM_FMTBIT(U24),
VIRTIO_SND_PCM_FMTBIT_S32 = VIRTIO_SND_PCM_FMTBIT(S32),
VIRTIO_SND_PCM_FMTBIT_U32 = VIRTIO_SND_PCM_FMTBIT(U32),
VIRTIO_SND_PCM_FMTBIT_FLOAT = VIRTIO_SND_PCM_FMTBIT(FLOAT),
VIRTIO_SND_PCM_FMTBIT_FLOAT64 = VIRTIO_SND_PCM_FMTBIT(FLOAT64),
VIRTIO_SND_PCM_FMTBIT_S20 = VIRTIO_SND_PCM_FMTBIT(S20),
VIRTIO_SND_PCM_FMTBIT_U20 = VIRTIO_SND_PCM_FMTBIT(U20),
VIRTIO_SND_PCM_FMTBIT_S24_3 = VIRTIO_SND_PCM_FMTBIT(S24_3),
VIRTIO_SND_PCM_FMTBIT_U24_3 = VIRTIO_SND_PCM_FMTBIT(U24_3),
VIRTIO_SND_PCM_FMTBIT_S20_3 = VIRTIO_SND_PCM_FMTBIT(S20_3),
VIRTIO_SND_PCM_FMTBIT_U20_3 = VIRTIO_SND_PCM_FMTBIT(U20_3),
VIRTIO_SND_PCM_FMTBIT_S18_3 = VIRTIO_SND_PCM_FMTBIT(S18_3),
VIRTIO_SND_PCM_FMTBIT_U18_3 = VIRTIO_SND_PCM_FMTBIT(U18_3)
};
/* supported PCM frame rates */
enum
{
VIRTIO_SND_PCM_RATE_8000,
VIRTIO_SND_PCM_RATE_11025,
VIRTIO_SND_PCM_RATE_16000,
VIRTIO_SND_PCM_RATE_22050,
VIRTIO_SND_PCM_RATE_32000,
VIRTIO_SND_PCM_RATE_44100,
VIRTIO_SND_PCM_RATE_48000,
VIRTIO_SND_PCM_RATE_64000,
VIRTIO_SND_PCM_RATE_88200,
VIRTIO_SND_PCM_RATE_96000,
VIRTIO_SND_PCM_RATE_176400,
VIRTIO_SND_PCM_RATE_192000
};
#define VIRTIO_SND_PCM_RATEBIT(bit) (1U << VIRTIO_SND_PCM_RATE_ ## bit)
enum
{
VIRTIO_SND_PCM_RATEBIT_8000 = VIRTIO_SND_PCM_RATEBIT(8000),
VIRTIO_SND_PCM_RATEBIT_11025 = VIRTIO_SND_PCM_RATEBIT(11025),
VIRTIO_SND_PCM_RATEBIT_16000 = VIRTIO_SND_PCM_RATEBIT(16000),
VIRTIO_SND_PCM_RATEBIT_22050 = VIRTIO_SND_PCM_RATEBIT(22050),
VIRTIO_SND_PCM_RATEBIT_32000 = VIRTIO_SND_PCM_RATEBIT(32000),
VIRTIO_SND_PCM_RATEBIT_44100 = VIRTIO_SND_PCM_RATEBIT(44100),
VIRTIO_SND_PCM_RATEBIT_48000 = VIRTIO_SND_PCM_RATEBIT(48000),
VIRTIO_SND_PCM_RATEBIT_64000 = VIRTIO_SND_PCM_RATEBIT(64000),
VIRTIO_SND_PCM_RATEBIT_88200 = VIRTIO_SND_PCM_RATEBIT(88200),
VIRTIO_SND_PCM_RATEBIT_96000 = VIRTIO_SND_PCM_RATEBIT(96000),
VIRTIO_SND_PCM_RATEBIT_176400 = VIRTIO_SND_PCM_RATEBIT(176400),
VIRTIO_SND_PCM_RATEBIT_192000 = VIRTIO_SND_PCM_RATEBIT(192000)
};
/* PCM channel map definitions */
enum
{
/* All channels have fixed channel positions */
VIRTIO_SND_PCM_CHMAP_FIXED,
/* All channels are swappable (e.g. {FL/FR/RL/RR} -> {RR/RL/FR/FL}) */
VIRTIO_SND_PCM_CHMAP_VARIABLE,
/* Only pair-wise channels are swappable (e.g. {FL/FR/RL/RR} -> {RL/RR/FL/FR}) */
VIRTIO_SND_PCM_CHMAP_PAIRED
};
/* Standard channel position definition */
enum
{
VIRTIO_SND_PCM_CH_NONE, /* undefined */
VIRTIO_SND_PCM_CH_NA, /* silent */
VIRTIO_SND_PCM_CH_MONO, /* mono stream */
VIRTIO_SND_PCM_CH_FL, /* front left */
VIRTIO_SND_PCM_CH_FR, /* front right */
VIRTIO_SND_PCM_CH_RL, /* rear left */
VIRTIO_SND_PCM_CH_RR, /* rear right */
VIRTIO_SND_PCM_CH_FC, /* front center */
VIRTIO_SND_PCM_CH_LFE, /* low frequency (LFE) */
VIRTIO_SND_PCM_CH_SL, /* side left */
VIRTIO_SND_PCM_CH_SR, /* side right */
VIRTIO_SND_PCM_CH_RC, /* rear center */
VIRTIO_SND_PCM_CH_FLC, /* front left center */
VIRTIO_SND_PCM_CH_FRC, /* front right center */
VIRTIO_SND_PCM_CH_RLC, /* rear left center */
VIRTIO_SND_PCM_CH_RRC, /* rear right center */
VIRTIO_SND_PCM_CH_FLW, /* front left wide */
VIRTIO_SND_PCM_CH_FRW, /* front right wide */
VIRTIO_SND_PCM_CH_FLH, /* front left high */
VIRTIO_SND_PCM_CH_FCH, /* front center high */
VIRTIO_SND_PCM_CH_FRH, /* front right high */
VIRTIO_SND_PCM_CH_TC, /* top center */
VIRTIO_SND_PCM_CH_TFL, /* top front left */
VIRTIO_SND_PCM_CH_TFR, /* top front right */
VIRTIO_SND_PCM_CH_TFC, /* top front center */
VIRTIO_SND_PCM_CH_TRL, /* top rear left */
VIRTIO_SND_PCM_CH_TRR, /* top rear right */
VIRTIO_SND_PCM_CH_TRC, /* top rear center */
VIRTIO_SND_PCM_CH_TFLC, /* top front left center */
VIRTIO_SND_PCM_CH_TFRC, /* top front right center */
VIRTIO_SND_PCM_CH_TSL, /* top side left */
VIRTIO_SND_PCM_CH_TSR, /* top side right */
VIRTIO_SND_PCM_CH_LLFE, /* left LFE */
VIRTIO_SND_PCM_CH_RLFE, /* right LFE */
VIRTIO_SND_PCM_CH_BC, /* bottom center */
VIRTIO_SND_PCM_CH_BLC, /* bottom left center */
VIRTIO_SND_PCM_CH_BRC /* bottom right center */
};
/*
* The channel is phase inverted (thus summing left and right channels would
* result in almost silence).
*/
enum
{
VIRTIO_SND_PCM_CH_F_PHASE_INVERSE = 0x01
};
/* PCM function descriptor */
struct virtio_snd_pcm_desc
{
/* sizeof(struct virtio_snd_pcm_desc) */
__u8 length;
/* VIRTIO_SND_DESC_PCM */
__u8 type;
/* a PCM function ID (assigned by the device) */
__u8 pcm_id;
/* # of PCM stream descriptors in the configuration (one per supported PCM stream type) */
__u8 nstreams;
};
/* PCM stream descriptor */
struct virtio_snd_pcm_stream_desc
{
/* sizeof(struct virtio_snd_pcm_stream_desc) */
__u8 length;
/* VIRTIO_SND_DESC_PCM_STREAM */
__u8 type;
/* a PCM stream type (VIRTIO_SND_PCM_T_XXX) */
__u8 stream_type;
/* # of substreams for the specified stream type */
__u8 nsubstreams;
/* minimum # of supported channels */
__u8 channels_min;
/* maximum # of supported channels */
__u8 channels_max;
/* supported PCM stream features (VIRTIO_SND_PCM_FEATBIT_XXX, can be ORed) */
__u8 features;
/* # of supported channel maps */
__u8 nchmaps;
/* supported sample formats (VIRTIO_SND_PCM_FMTBIT_XXX, can be ORed) */
__virtio32 formats;
/* supported frame rates (VIRTIO_SND_PCM_RATEBIT_XXX, can be ORed) */
__virtio32 rates;
};
/* PCM substream request header */
struct virtio_snd_pcm_hdr
{
/* VIRTIO_SND_FN_PCM */
__virtio16 function;
/* a PCM request type (VIRTIO_SND_PCM_R_XXX) */
__virtio16 request;
/* a PCM identifier (assigned in configuration) */
__u8 pcm_id;
/* a PCM stream type (VIRTIO_SND_PCM_T_XXX) */
__u8 stream_type;
/* a PCM substream identifier [0 .. virtio_snd_pcm_stream_desc::nsubstreams - 1] */
__u8 substream_id;
__u8 padding;
};
/* get/set PCM substream feature */
struct virtio_snd_pcm_feature
{
/* VIRTIO_SND_FN_PCM */
__virtio16 function;
/* VIRTIO_SND_PCM_R_GET_FEATURE / VIRTIO_SND_PCM_R_SET_FEATURE */
__virtio16 request;
/* a PCM identifier (assigned in configuration) */
__u8 pcm_id;
/* a PCM stream type (VIRTIO_SND_PCM_T_XXX) */
__u8 stream_type;
/* a PCM substream identifier [0 .. virtio_snd_pcm_stream_desc::nsubstreams - 1] */
__u8 substream_id;
/* a selected PCM substream feature (VIRTIO_SND_PCM_FEAT_XXX) */
__u8 feature;
/* a feature-specific request data */
/*
* VIRTIO_SND_PCM_FEAT_UPDATE_FREQUENCY [SET-only]
* .data = an approximate update frequency in bytes
* VIRTIO_SND_PCM_FEAT_CHANNEL_MAP [GET/SET]
* GET:
* .data = a channel map index [0 .. virtio_snd_pcm_stream_desc::nchmaps - 1]
* SET:
* .data = a pseudophysical start address of the virtio_snd_pcm_chmap_data structure
*/
__virtio64 data;
};
#define VIRTIO_SND_PCM_CH_MAX 256
/* PCM channel information */
struct virtio_snd_pcm_chinfo
{
/* a PCM channel position (VIRTIO_SND_PCM_CH_XXX) */
__u8 position;
/* a PCM channel flags (VIRTIO_SND_PCM_CH_F_XXX, can be ORed) */
__u8 flags;
};
/* PCM channel map data */
struct virtio_snd_pcm_chmap_data
{
/* # of valid entries in the PCM channel map */
__virtio32 nchannels;
/* a PCM channel map */
struct virtio_snd_pcm_chinfo channel_map[VIRTIO_SND_PCM_CH_MAX];
};
/* a response containing PCM channel map */
struct virtio_snd_pcm_chmap
{
struct virtio_snd_rsp hdr;
/* a channel map type (VIRTIO_SND_PCM_CHMAP_XXX) */
__u8 type;
/* reserved, must be zero */
__u8 reserved[3];
/* a channel map data */
struct virtio_snd_pcm_chmap_data data;
};
/* assign data queue for PCM substream */
struct virtio_snd_pcm_set_queue
{
/* .request = VIRTIO_SND_PCM_R_SET_QUEUE */
struct virtio_snd_pcm_hdr hdr;
/* a virtual queue index */
__virtio32 queue;
};
/* set PCM substream format */
struct virtio_snd_pcm_set_format
{
/* .request = VIRTIO_SND_PCM_R_SET_FORMAT */
struct virtio_snd_pcm_hdr hdr;
/* # of channels */
__virtio16 channels;
/* a PCM sample format (VIRTIO_SND_PCM_FMT_XXX) */
__virtio16 format;
/* a PCM frame rate (VIRTIO_SND_PCM_RATE_XXX) */
__virtio16 rate;
__u16 padding;
};
#endif /* VIRTIO_SND_IF_H */
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