/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
 * ----------------------------------------------------------------------------
 *
 * $FreeBSD: src/sys/sys/timepps.h,v 1.12 1999/12/29 04:24:48 peter Exp $
 *
 * The is a FreeBSD protype version of the "draft-mogul-pps-api-05.txt" 
 * specification for Pulse Per Second timing interfaces.  
 */

#ifndef _SYS_TIMEPPS_H_
#define _SYS_TIMEPPS_H_

#ifndef _SYS_IOCCOM_H_
#include <sys/ioccom.h>
#endif
#ifndef _SYS_TIME_H_
#include <sys/time.h>
#endif

#define PPS_API_VERS_1  1

typedef int pps_handle_t;       

typedef unsigned pps_seq_t;

typedef struct ntp_fp {
        unsigned int    integral;
        unsigned int    fractional;
} ntp_fp_t;

typedef union pps_timeu {
        struct timespec tspec;
        ntp_fp_t        ntpfp;
        unsigned long   longpad[3];
} pps_timeu_t;

typedef struct {
        pps_seq_t       assert_sequence;        /* assert event seq # */
        pps_seq_t       clear_sequence;         /* clear event seq # */
        pps_timeu_t     assert_tu;
        pps_timeu_t     clear_tu;
        int             current_mode;           /* current mode bits */
} pps_info_t;

#define assert_timestamp        assert_tu.tspec
#define clear_timestamp         clear_tu.tspec

#define assert_timestamp_ntpfp  assert_tu.ntpfp
#define clear_timestamp_ntpfp   clear_tu.ntpfp

typedef struct {
        int api_version;                        /* API version # */
        int mode;                               /* mode bits */
        pps_timeu_t assert_off_tu;
        pps_timeu_t clear_off_tu;
} pps_params_t;

#define assert_offset   assert_off_tu.tspec
#define clear_offset    clear_off_tu.tspec

#define assert_offset_ntpfp     assert_off_tu.ntpfp
#define clear_offset_ntpfp      clear_off_tu.ntpfp


#define PPS_CAPTUREASSERT       0x01
#define PPS_CAPTURECLEAR        0x02
#define PPS_CAPTUREBOTH         0x03

#define PPS_OFFSETASSERT        0x10
#define PPS_OFFSETCLEAR         0x20

#define PPS_ECHOASSERT          0x40
#define PPS_ECHOCLEAR           0x80

#define PPS_CANWAIT             0x100
#define PPS_CANPOLL             0x200

#define PPS_TSFMT_TSPEC         0x1000
#define PPS_TSFMT_NTPFP         0x2000

#define PPS_KC_HARDPPS          0
#define PPS_KC_HARDPPS_PLL      1
#define PPS_KC_HARDPPS_FLL      2

struct pps_fetch_args {
        int tsformat;
        pps_info_t      pps_info_buf;
        struct timespec timeout;
};

struct pps_kcbind_args {
        int kernel_consumer;
        int edge;
        int tsformat;
};

#define PPS_IOC_CREATE          _IO('1', 1)
#define PPS_IOC_DESTROY         _IO('1', 2)
#define PPS_IOC_SETPARAMS       _IOW('1', 3, pps_params_t)
#define PPS_IOC_GETPARAMS       _IOR('1', 4, pps_params_t)
#define PPS_IOC_GETCAP          _IOR('1', 5, int)
#define PPS_IOC_FETCH           _IOWR('1', 6, struct pps_fetch_args)
#define PPS_IOC_KCBIND          _IOW('1', 7, struct pps_kcbind_args)

#ifdef _KERNEL

#include <sys/systimer.h>

struct pps_state {
        pps_params_t    ppsparam;
        pps_info_t      ppsinfo;
        int             kcmode;
        int             ppscap;
        sysclock_t      ppscount[3];
};

void pps_event (struct pps_state *pps, sysclock_t count, int event);
void pps_init (struct pps_state *pps);
int pps_ioctl (u_long cmd, caddr_t data, struct pps_state *pps);
void hardpps (struct timespec *tsp, long nsec);

#else /* !_KERNEL */

static __inline int
time_pps_create(int filedes, pps_handle_t *handle)
{
        int error;

        *handle = -1;
        error = ioctl(filedes, PPS_IOC_CREATE, 0);
        if (error < 0) 
                return (-1);
        *handle = filedes;
        return (0);
}

static __inline int
time_pps_destroy(pps_handle_t handle)
{
        return (ioctl(handle, PPS_IOC_DESTROY, 0));
}

static __inline int
time_pps_setparams(pps_handle_t handle, const pps_params_t *ppsparams)
{
        return (ioctl(handle, PPS_IOC_SETPARAMS, ppsparams));
}

static __inline int
time_pps_getparams(pps_handle_t handle, pps_params_t *ppsparams)
{
        return (ioctl(handle, PPS_IOC_GETPARAMS, ppsparams));
}

static __inline int 
time_pps_getcap(pps_handle_t handle, int *mode)
{
        return (ioctl(handle, PPS_IOC_GETCAP, mode));
}

static __inline int
time_pps_fetch(pps_handle_t handle, const int tsformat,
        pps_info_t *ppsinfobuf, const struct timespec *timeout)
{
        int error;
        struct pps_fetch_args arg;

        arg.tsformat = tsformat;
        if (timeout == NULL) {
                arg.timeout.tv_sec = -1;
                arg.timeout.tv_nsec = -1;
        } else
                arg.timeout = *timeout;
        error = ioctl(handle, PPS_IOC_FETCH, &arg);
        *ppsinfobuf = arg.pps_info_buf;
        return (error);
}

static __inline int
time_pps_kcbind(pps_handle_t handle, const int kernel_consumer,
        const int edge, const int tsformat)
{
        struct pps_kcbind_args arg;

        arg.kernel_consumer = kernel_consumer;
        arg.edge = edge;
        arg.tsformat = tsformat;
        return (ioctl(handle, PPS_IOC_KCBIND, &arg));
}

#endif /* _KERNEL */
#endif /* _SYS_TIMEPPS_H_ */