drivers/media/pci/cx25821/cx25821-audio.h

Source file repositories/reference/linux-study-clean/drivers/media/pci/cx25821/cx25821-audio.h

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/cx25821/cx25821-audio.h
Extension
.h
Size
1417 bytes
Lines
49
Domain
Driver Families
Bucket
drivers/media
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

#ifndef __CX25821_AUDIO_H__
#define __CX25821_AUDIO_H__

#define USE_RISC_NOOP		1
#define LINES_PER_BUFFER	15
#define AUDIO_LINE_SIZE		128

/* Number of buffer programs to use at once. */
#define NUMBER_OF_PROGRAMS	8

/*
 * Max size of the RISC program for a buffer. - worst case is 2 writes per line
 * Space is also added for the 4 no-op instructions added on the end.
 */
#ifndef USE_RISC_NOOP
#define MAX_BUFFER_PROGRAM_SIZE						\
	(2 * LINES_PER_BUFFER * RISC_WRITE_INSTRUCTION_SIZE +		\
	 RISC_WRITECR_INSTRUCTION_SIZE * 4)
#endif

/* MAE 12 July 2005 Try to use NOOP RISC instruction instead */
#ifdef USE_RISC_NOOP
#define MAX_BUFFER_PROGRAM_SIZE						\
	(2 * LINES_PER_BUFFER * RISC_WRITE_INSTRUCTION_SIZE +		\
	 RISC_NOOP_INSTRUCTION_SIZE * 4)
#endif

/* Sizes of various instructions in bytes.  Used when adding instructions. */
#define RISC_WRITE_INSTRUCTION_SIZE	12
#define RISC_JUMP_INSTRUCTION_SIZE	12
#define RISC_SKIP_INSTRUCTION_SIZE	4
#define RISC_SYNC_INSTRUCTION_SIZE	4
#define RISC_WRITECR_INSTRUCTION_SIZE	16
#define RISC_NOOP_INSTRUCTION_SIZE	4

#define MAX_AUDIO_DMA_BUFFER_SIZE					\
	(MAX_BUFFER_PROGRAM_SIZE * NUMBER_OF_PROGRAMS +			\
	 RISC_SYNC_INSTRUCTION_SIZE)

#endif

Annotation

Implementation Notes