sound/usb/usx2y/usbusx2y.h

Source file repositories/reference/linux-study-clean/sound/usb/usx2y/usbusx2y.h

File Facts

System
Linux kernel
Corpus path
sound/usb/usx2y/usbusx2y.h
Extension
.h
Size
2952 bytes
Lines
115
Domain
Driver Families
Bucket
sound/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct snd_usx2y_async_seq {
	struct urb	*urb[URBS_ASYNC_SEQ];
	char		*buffer;
};

struct snd_usx2y_urb_seq {
	int	submitted;
	int	len;
	struct urb	*urb[] __counted_by(len);
};

#include "usx2yhwdeppcm.h"

struct usx2ydev {
	struct usb_device	*dev;
	int			card_index;
	int			stride;
	struct urb		*in04_urb;
	void			*in04_buf;
	char			in04_last[24];
	unsigned int		in04_int_calls;
	struct snd_usx2y_urb_seq	*us04;
	wait_queue_head_t	in04_wait_queue;
	struct snd_usx2y_async_seq	as04;
	unsigned int		rate,
				format;
	int			chip_status;
	struct mutex		pcm_mutex;
	struct us428ctls_sharedmem	*us428ctls_sharedmem;
	int			wait_iso_frame;
	wait_queue_head_t	us428ctls_wait_queue_head;
	struct snd_usx2y_hwdep_pcm_shm	*hwdep_pcm_shm;
	struct snd_usx2y_substream	*subs[4];
	struct snd_usx2y_substream	* volatile  prepare_subs;
	wait_queue_head_t	prepare_wait_queue;
	struct list_head	midi_list;
	int			pcm_devs;
};


struct snd_usx2y_substream {
	struct usx2ydev	*usx2y;
	struct snd_pcm_substream *pcm_substream;

	int			endpoint;
	unsigned int		maxpacksize;		/* max packet size in bytes */

	atomic_t		state;
#define STATE_STOPPED	0
#define STATE_STARTING1 1
#define STATE_STARTING2 2
#define STATE_STARTING3 3
#define STATE_PREPARED	4
#define STATE_PRERUNNING  6
#define STATE_RUNNING	8

	int			hwptr;			/* free frame position in the buffer (only for playback) */
	int			hwptr_done;		/* processed frame position in the buffer */
	int			transfer_done;		/* processed frames since last period update */

	struct urb		*urb[NRURBS];	/* data urb table */
	struct urb		*completed_urb;
	char			*tmpbuf;			/* temporary buffer for playback */
};


#define usx2y(c) ((struct usx2ydev *)(c)->private_data)

int usx2y_audio_create(struct snd_card *card);

int usx2y_async_seq04_init(struct usx2ydev *usx2y);
int usx2y_in04_init(struct usx2ydev *usx2y);

#define NAME_ALLCAPS "US-X2Y"

#endif

Annotation

Implementation Notes