include/linux/pps_kernel.h

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

File Facts

System
Linux kernel
Corpus path
include/linux/pps_kernel.h
Extension
.h
Size
3078 bytes
Lines
123
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 pps_source_info {
	char name[PPS_MAX_NAME_LEN];		/* symbolic name */
	char path[PPS_MAX_NAME_LEN];		/* path of connected device */
	int mode;				/* PPS allowed mode */

	void (*echo)(struct pps_device *pps,
			int event, void *data);	/* PPS echo function */

	struct module *owner;
	struct device *dev;		/* Parent device for device_create */
};

struct pps_event_time {
#ifdef CONFIG_NTP_PPS
	struct timespec64 ts_raw;
#endif /* CONFIG_NTP_PPS */
	struct timespec64 ts_real;
};

/* The main struct */
struct pps_device {
	struct pps_source_info info;		/* PSS source info */

	struct pps_kparams params;		/* PPS current params */

	__u32 assert_sequence;			/* PPS assert event seq # */
	__u32 clear_sequence;			/* PPS clear event seq # */
	struct pps_ktime assert_tu;
	struct pps_ktime clear_tu;
	int current_mode;			/* PPS mode at event time */

	unsigned int last_ev;			/* last PPS event id */
	unsigned int last_fetched_ev;		/* last fetched PPS event id */
	wait_queue_head_t queue;		/* PPS event queue */

	unsigned int id;			/* PPS source unique ID */
	void const *lookup_cookie;		/* For pps_lookup_dev() only */
	struct device dev;
	struct fasync_struct *async_queue;	/* fasync method */
	spinlock_t lock;
};

/*
 * Global variables
 */

extern const struct attribute_group *pps_groups[];

/*
 * Internal functions.
 *
 * These are not actually part of the exported API, but this is a
 * convenient header file to put them in.
 */

extern int pps_register_cdev(struct pps_device *pps);
extern void pps_unregister_cdev(struct pps_device *pps);

/*
 * Exported functions
 */

extern struct pps_device *pps_register_source(
		struct pps_source_info *info, int default_params);
extern void pps_unregister_source(struct pps_device *pps);
extern void pps_event(struct pps_device *pps,
		struct pps_event_time *ts, int event, void *data);
/* Look up a pps_device by magic cookie */
struct pps_device *pps_lookup_dev(void const *cookie);

static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
		struct timespec64 ts)
{
	kt->sec = ts.tv_sec;
	kt->nsec = ts.tv_nsec;
}

static inline void pps_get_ts(struct pps_event_time *ts)
{
#ifdef CONFIG_NTP_PPS
	struct system_time_snapshot snap;

	ktime_get_snapshot_id(CLOCK_REALTIME, &snap);
	ts->ts_real = ktime_to_timespec64(snap.systime);
	ts->ts_raw = ktime_to_timespec64(snap.monoraw);
#else
	ktime_get_real_ts64(&ts->ts_real);
#endif
}

Annotation

Implementation Notes