drivers/comedi/drivers/dt2801.c

File Facts

System

Linux kernel

Corpus path

drivers/comedi/drivers/dt2801.c

Extension

.c

Size

13706 bytes

Lines

647

Domain

Driver Families

Bucket

drivers/comedi

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.

• 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/comedi/comedidev.h
• linux/delay.h

Detected Declarations

• struct dt2801_board
• struct dt2801_private
• function dt2801_readdata
• function dt2801_readdata2
• function dt2801_writedata
• function dt2801_writedata2
• function dt2801_wait_for_ready
• function dt2801_writecmd
• function dt2801_reset
• function probe_number_of_ai_chans
• function dt2801_error
• function dt2801_ai_insn_read
• function dt2801_ao_insn_write
• function dt2801_dio_insn_bits
• function dt2801_dio_insn_config
• function dt2801_attach

Annotated Snippet

struct dt2801_board {
	const char *name;
	int boardcode;
	int ad_diff;
	int ad_chan;
	int adbits;
	int adrangetype;
	int dabits;
};

/*
 * Typeid's for the different boards of the DT2801-series
 * (taken from the test-software, that comes with the board)
 */
static const struct dt2801_board boardtypes[] = {
	{
	 .name = "dt2801",
	 .boardcode = 0x09,
	 .ad_diff = 2,
	 .ad_chan = 16,
	 .adbits = 12,
	 .adrangetype = 0,
	 .dabits = 12},
	{
	 .name = "dt2801-a",
	 .boardcode = 0x52,
	 .ad_diff = 2,
	 .ad_chan = 16,
	 .adbits = 12,
	 .adrangetype = 0,
	 .dabits = 12},
	{
	 .name = "dt2801/5716a",
	 .boardcode = 0x82,
	 .ad_diff = 1,
	 .ad_chan = 16,
	 .adbits = 16,
	 .adrangetype = 1,
	 .dabits = 12},
	{
	 .name = "dt2805",
	 .boardcode = 0x12,
	 .ad_diff = 1,
	 .ad_chan = 16,
	 .adbits = 12,
	 .adrangetype = 0,
	 .dabits = 12},
	{
	 .name = "dt2805/5716a",
	 .boardcode = 0x92,
	 .ad_diff = 1,
	 .ad_chan = 16,
	 .adbits = 16,
	 .adrangetype = 1,
	 .dabits = 12},
	{
	 .name = "dt2808",
	 .boardcode = 0x20,
	 .ad_diff = 0,
	 .ad_chan = 16,
	 .adbits = 12,
	 .adrangetype = 2,
	 .dabits = 8},
	{
	 .name = "dt2818",
	 .boardcode = 0xa2,
	 .ad_diff = 0,
	 .ad_chan = 4,
	 .adbits = 12,
	 .adrangetype = 0,
	 .dabits = 12},
	{
	 .name = "dt2809",
	 .boardcode = 0xb0,
	 .ad_diff = 0,
	 .ad_chan = 8,
	 .adbits = 12,
	 .adrangetype = 1,
	 .dabits = 12},
};

struct dt2801_private {
	const struct comedi_lrange *dac_range_types[2];
};

/*
 * These are the low-level routines:
 * writecommand: write a command to the board
 * writedata: write data byte
 * readdata: read data byte

Annotation

• Immediate include surface: `linux/module.h`, `linux/comedi/comedidev.h`, `linux/delay.h`.
• Detected declarations: `struct dt2801_board`, `struct dt2801_private`, `function dt2801_readdata`, `function dt2801_readdata2`, `function dt2801_writedata`, `function dt2801_writedata2`, `function dt2801_wait_for_ready`, `function dt2801_writecmd`, `function dt2801_reset`, `function probe_number_of_ai_chans`.
• Atlas domain: Driver Families / drivers/comedi.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.