include/linux/comedi/comedi_8254.h

File Facts

System

Linux kernel

Corpus path

include/linux/comedi/comedi_8254.h

Extension

.h

Size

5201 bytes

Lines

162

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.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• linux/errno.h
• linux/err.h

Detected Declarations

• struct comedi_device
• struct comedi_insn
• struct comedi_subdevice
• struct comedi_8254
• struct comedi_8254

Annotated Snippet

struct comedi_8254 {
	comedi_8254_iocb_fn *iocb;
	unsigned long context;
	unsigned int iosize;
	unsigned int regshift;
	unsigned int osc_base;
	unsigned int divisor;
	unsigned int divisor1;
	unsigned int divisor2;
	unsigned int next_div;
	unsigned int next_div1;
	unsigned int next_div2;
	unsigned int clock_src[3];
	unsigned int gate_src[3];
	bool busy[3];

	int (*insn_config)(struct comedi_device *dev,
			   struct comedi_subdevice *s,
			   struct comedi_insn *insn, unsigned int *data);
};

unsigned int comedi_8254_status(struct comedi_8254 *i8254,
				unsigned int counter);
unsigned int comedi_8254_read(struct comedi_8254 *i8254, unsigned int counter);
void comedi_8254_write(struct comedi_8254 *i8254,
		       unsigned int counter, unsigned int val);

int comedi_8254_set_mode(struct comedi_8254 *i8254,
			 unsigned int counter, unsigned int mode);
int comedi_8254_load(struct comedi_8254 *i8254,
		     unsigned int counter, unsigned int val, unsigned int mode);

void comedi_8254_pacer_enable(struct comedi_8254 *i8254,
			      unsigned int counter1, unsigned int counter2,
			      bool enable);
void comedi_8254_update_divisors(struct comedi_8254 *i8254);
void comedi_8254_cascade_ns_to_timer(struct comedi_8254 *i8254,
				     unsigned int *nanosec, unsigned int flags);
void comedi_8254_ns_to_timer(struct comedi_8254 *i8254,
			     unsigned int *nanosec, unsigned int flags);

void comedi_8254_set_busy(struct comedi_8254 *i8254,
			  unsigned int counter, bool busy);

void comedi_8254_subdevice_init(struct comedi_subdevice *s,
				struct comedi_8254 *i8254);

#ifdef CONFIG_HAS_IOPORT
struct comedi_8254 *comedi_8254_io_alloc(unsigned long iobase,
					 unsigned int osc_base,
					 unsigned int iosize,
					 unsigned int regshift);
#else
static inline struct comedi_8254 *comedi_8254_io_alloc(unsigned long iobase,
						       unsigned int osc_base,
						       unsigned int iosize,
						       unsigned int regshift)
{
	return ERR_PTR(-ENXIO);
}
#endif

struct comedi_8254 *comedi_8254_mm_alloc(void __iomem *mmio,
					 unsigned int osc_base,
					 unsigned int iosize,
					 unsigned int regshift);

#endif	/* _COMEDI_8254_H */

Annotation

• Immediate include surface: `linux/types.h`, `linux/errno.h`, `linux/err.h`.
• Detected declarations: `struct comedi_device`, `struct comedi_insn`, `struct comedi_subdevice`, `struct comedi_8254`, `struct comedi_8254`.
• Atlas domain: Core OS / Core Kernel Interface.
• 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.