[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / pps_kernel.h

/*
 * PPS API kernel header
 *
 * Copyright (C) 2009   Rodolfo Giometti <giometti@linux.it>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef LINUX_PPS_KERNEL_H
#define LINUX_PPS_KERNEL_H

#include <linux/pps.h>

#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/time.h>

/*
 * Global defines
 */

struct pps_device;

/* The specific PPS source info */
struct pps_source_info {
	char name[PPS_MAX_NAME_LEN];		/* simbolic name */
	char path[PPS_MAX_NAME_LEN];		/* path of connected device */
	int mode;				/* PPS's 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 timespec ts_raw;
#endif /* CONFIG_NTP_PPS */
	struct timespec ts_real;
};

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

	struct pps_kparams params;		/* PPS's 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 */
	wait_queue_head_t queue;		/* PPS event queue */

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

/*
 * Global variables
 */

extern struct device_attribute pps_attrs[];

/*
 * 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 timespec ts)
{
	kt->sec = ts.tv_sec;
	kt->nsec = ts.tv_nsec;
}

#ifdef CONFIG_NTP_PPS

static inline void pps_get_ts(struct pps_event_time *ts)
{
	getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
}

#else /* CONFIG_NTP_PPS */

static inline void pps_get_ts(struct pps_event_time *ts)
{
	getnstimeofday(&ts->ts_real);
}

#endif /* CONFIG_NTP_PPS */

/* Subtract known time delay from PPS event time(s) */
static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec delta)
{
	ts->ts_real = timespec_sub(ts->ts_real, delta);
#ifdef CONFIG_NTP_PPS
	ts->ts_raw = timespec_sub(ts->ts_raw, delta);
#endif
}

#endif /* LINUX_PPS_KERNEL_H */
Commit	Line	Data
eae9d2ba RG	1	/*
	2	* PPS API kernel header
	3	*
	4	* Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
7a21a3cc AG	21	#ifndef LINUX_PPS_KERNEL_H
	22	#define LINUX_PPS_KERNEL_H
	23
eae9d2ba RG	24	#include <linux/pps.h>
	25
	26	#include <linux/cdev.h>
	27	#include <linux/device.h>
	28	#include <linux/time.h>
	29
	30	/*
	31	* Global defines
	32	*/
	33
5e196d34 AG	34	struct pps_device;
5e196d34 AG	35
eae9d2ba RG	36	/* The specific PPS source info */
	37	struct pps_source_info {
	38	char name[PPS_MAX_NAME_LEN]; /* simbolic name */
	39	char path[PPS_MAX_NAME_LEN]; /* path of connected device */
	40	int mode; /* PPS's allowed mode */
	41
5e196d34 AG	42	void (echo)(struct pps_device pps,
5e196d34 AG	43	int event, void data); / PPS echo function */
eae9d2ba RG	44
eae9d2ba RG	45	struct module *owner;
513b032c	46	struct device dev; / Parent device for device_create */
eae9d2ba RG	47	};
eae9d2ba RG	48
6f4229b5	49	struct pps_event_time {
e2c18e49 AG	50	#ifdef CONFIG_NTP_PPS
	51	struct timespec ts_raw;
	52	#endif /* CONFIG_NTP_PPS */
6f4229b5 AG	53	struct timespec ts_real;
	54	};
	55
eae9d2ba RG	56	/* The main struct */
	57	struct pps_device {
	58	struct pps_source_info info; /* PSS source info */
	59
	60	struct pps_kparams params; /* PPS's current params */
	61
	62	__u32 assert_sequence; /* PPS' assert event seq # */
	63	__u32 clear_sequence; /* PPS' clear event seq # */
	64	struct pps_ktime assert_tu;
	65	struct pps_ktime clear_tu;
	66	int current_mode; /* PPS mode at event time */
	67
3003d55b	68	unsigned int last_ev; /* last PPS event id */
eae9d2ba RG	69	wait_queue_head_t queue; /* PPS event queue */
	70
	71	unsigned int id; /* PPS source unique ID */
513b032c	72	void const lookup_cookie; / pps_lookup_dev only */
eae9d2ba RG	73	struct cdev cdev;
eae9d2ba RG	74	struct device *dev;
eae9d2ba RG	75	struct fasync_struct async_queue; / fasync method */
eae9d2ba RG	76	spinlock_t lock;
eae9d2ba RG	77	};
	78
	79	/*
	80	* Global variables
	81	*/
	82
eae9d2ba RG	83	extern struct device_attribute pps_attrs[];
eae9d2ba RG	84
513b032c GS	85	/*
	86	* Internal functions.
	87	*
	88	* These are not actually part of the exported API, but this is a
	89	* convenient header file to put them in.
	90	*/
	91
	92	extern int pps_register_cdev(struct pps_device *pps);
	93	extern void pps_unregister_cdev(struct pps_device *pps);
	94
eae9d2ba RG	95	/*
	96	* Exported functions
	97	*/
	98
5e196d34 AG	99	extern struct pps_device *pps_register_source(
	100	struct pps_source_info *info, int default_params);
	101	extern void pps_unregister_source(struct pps_device *pps);
5e196d34 AG	102	extern void pps_event(struct pps_device *pps,
5e196d34 AG	103	struct pps_event_time ts, int event, void data);
513b032c GS	104	/* Look up a pps device by magic cookie */
513b032c GS	105	struct pps_device pps_lookup_dev(void const cookie);
6f4229b5 AG	106
	107	static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
	108	struct timespec ts)
	109	{
	110	kt->sec = ts.tv_sec;
	111	kt->nsec = ts.tv_nsec;
	112	}
	113
e2c18e49 AG	114	#ifdef CONFIG_NTP_PPS
	115
	116	static inline void pps_get_ts(struct pps_event_time *ts)
	117	{
	118	getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
	119	}
	120
	121	#else /* CONFIG_NTP_PPS */
	122
6f4229b5 AG	123	static inline void pps_get_ts(struct pps_event_time *ts)
	124	{
	125	getnstimeofday(&ts->ts_real);
	126	}
7a21a3cc	127
e2c18e49 AG	128	#endif /* CONFIG_NTP_PPS */
e2c18e49 AG	129
220a60a4 BH	130	/* Subtract known time delay from PPS event time(s) */
	131	static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec delta)
	132	{
	133	ts->ts_real = timespec_sub(ts->ts_real, delta);
	134	#ifdef CONFIG_NTP_PPS
	135	ts->ts_raw = timespec_sub(ts->ts_raw, delta);
	136	#endif
	137	}
	138
7a21a3cc	139	#endif /* LINUX_PPS_KERNEL_H */
6f4229b5	140