include/uapi/linux/virtio_snd.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/virtio_snd.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/virtio_snd.h
Extension
.h
Size
13193 bytes
Lines
489
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct virtio_snd_config {
	/* # of available physical jacks */
	__le32 jacks;
	/* # of available PCM streams */
	__le32 streams;
	/* # of available channel maps */
	__le32 chmaps;
	/* # of available control elements (if VIRTIO_SND_F_CTLS) */
	__le32 controls;
};

enum {
	/* device virtqueue indexes */
	VIRTIO_SND_VQ_CONTROL = 0,
	VIRTIO_SND_VQ_EVENT,
	VIRTIO_SND_VQ_TX,
	VIRTIO_SND_VQ_RX,
	/* # of device virtqueues */
	VIRTIO_SND_VQ_MAX
};

/*******************************************************************************
 * COMMON DEFINITIONS
 */

/* supported dataflow directions */
enum {
	VIRTIO_SND_D_OUTPUT = 0,
	VIRTIO_SND_D_INPUT
};

enum {
	/* jack control request types */
	VIRTIO_SND_R_JACK_INFO = 1,
	VIRTIO_SND_R_JACK_REMAP,

	/* PCM control request types */
	VIRTIO_SND_R_PCM_INFO = 0x0100,
	VIRTIO_SND_R_PCM_SET_PARAMS,
	VIRTIO_SND_R_PCM_PREPARE,
	VIRTIO_SND_R_PCM_RELEASE,
	VIRTIO_SND_R_PCM_START,
	VIRTIO_SND_R_PCM_STOP,

	/* channel map control request types */
	VIRTIO_SND_R_CHMAP_INFO = 0x0200,

	/* control element request types */
	VIRTIO_SND_R_CTL_INFO = 0x0300,
	VIRTIO_SND_R_CTL_ENUM_ITEMS,
	VIRTIO_SND_R_CTL_READ,
	VIRTIO_SND_R_CTL_WRITE,
	VIRTIO_SND_R_CTL_TLV_READ,
	VIRTIO_SND_R_CTL_TLV_WRITE,
	VIRTIO_SND_R_CTL_TLV_COMMAND,

	/* jack event types */
	VIRTIO_SND_EVT_JACK_CONNECTED = 0x1000,
	VIRTIO_SND_EVT_JACK_DISCONNECTED,

	/* PCM event types */
	VIRTIO_SND_EVT_PCM_PERIOD_ELAPSED = 0x1100,
	VIRTIO_SND_EVT_PCM_XRUN,

	/* control element event types */
	VIRTIO_SND_EVT_CTL_NOTIFY = 0x1200,

	/* common status codes */
	VIRTIO_SND_S_OK = 0x8000,
	VIRTIO_SND_S_BAD_MSG,
	VIRTIO_SND_S_NOT_SUPP,
	VIRTIO_SND_S_IO_ERR
};

/* common header */
struct virtio_snd_hdr {
	__le32 code;
};

/* event notification */
struct virtio_snd_event {
	/* VIRTIO_SND_EVT_XXX */
	struct virtio_snd_hdr hdr;
	/* optional event data */
	__le32 data;
};

/* common control request to query an item information */
struct virtio_snd_query_info {
	/* VIRTIO_SND_R_XXX_INFO */

Annotation

Implementation Notes