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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */

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* PPS API header

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* This program is free software; you can redistribute it and/or modify

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* it under the terms of the GNU General Public License as published by

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* the Free Software Foundation; either version 2 of the License, or

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* (at your option) any later version.

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* This program is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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* GNU General Public License for more details.

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* You should have received a copy of the GNU General Public License

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* along with this program; if not, write to the Free Software

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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

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#ifndef _PPS_H_

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#define _PPS_H_

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#include <linux/types.h>

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#define PPS_VERSION "5.3.6"

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#define PPS_MAX_SOURCES 16 /* should be enough... */

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/* Implementation note: the logical states ``assert'' and ``clear''

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* are implemented in terms of the chip register, i.e. ``assert''

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* means the bit is set. */

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* 3.2 New data structures

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#define PPS_API_VERS_1 1

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#define PPS_API_VERS PPS_API_VERS_1 /* we use API version 1 */

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#define PPS_MAX_NAME_LEN 32

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/* 32-bit vs. 64-bit compatibility.

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* 0n i386, the alignment of a uint64_t is only 4 bytes, while on most other

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* architectures it's 8 bytes. On i386, there will be no padding between the

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* two consecutive 'struct pps_ktime' members of struct pps_kinfo and struct

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* pps_kparams. But on most platforms there will be padding to ensure correct

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* alignment.

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* The simple fix is probably to add an explicit padding.

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* [David Woodhouse]

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struct pps_ktime {

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__s64 sec;

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__s32 nsec;

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__u32 flags;

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};

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struct pps_ktime_compat {

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__s64 sec;

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__s32 nsec;

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__u32 flags;

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} __attribute__((packed, aligned(4)));

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#define PPS_TIME_INVALID (1<<0) /* used to specify timeout==NULL */

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struct pps_kinfo {

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__u32 assert_sequence; /* seq. num. of assert event */

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__u32 clear_sequence; /* seq. num. of clear event */

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struct pps_ktime assert_tu; /* time of assert event */

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struct pps_ktime clear_tu; /* time of clear event */

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int current_mode; /* current mode bits */

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};

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struct pps_kinfo_compat {

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__u32 assert_sequence; /* seq. num. of assert event */

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__u32 clear_sequence; /* seq. num. of clear event */

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struct pps_ktime_compat assert_tu; /* time of assert event */

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struct pps_ktime_compat clear_tu; /* time of clear event */

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int current_mode; /* current mode bits */

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};

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struct pps_kparams {

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int api_version; /* API version # */

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int mode; /* mode bits */

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struct pps_ktime assert_off_tu; /* offset compensation for assert */

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struct pps_ktime clear_off_tu; /* offset compensation for clear */

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};

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* 3.3 Mode bit definitions

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/* Device/implementation parameters */

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#define PPS_CAPTUREASSERT 0x01 /* capture assert events */

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#define PPS_CAPTURECLEAR 0x02 /* capture clear events */

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#define PPS_CAPTUREBOTH 0x03 /* capture assert and clear events */

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#define PPS_OFFSETASSERT 0x10 /* apply compensation for assert event */

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#define PPS_OFFSETCLEAR 0x20 /* apply compensation for clear event */

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#define PPS_CANWAIT 0x100 /* can we wait for an event? */

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#define PPS_CANPOLL 0x200 /* bit reserved for future use */

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/* Kernel actions */

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#define PPS_ECHOASSERT 0x40 /* feed back assert event to output */

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#define PPS_ECHOCLEAR 0x80 /* feed back clear event to output */

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/* Timestamp formats */

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#define PPS_TSFMT_TSPEC 0x1000 /* select timespec format */

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#define PPS_TSFMT_NTPFP 0x2000 /* select NTP format */

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* 3.4.4 New functions: disciplining the kernel timebase

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/* Kernel consumers */

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#define PPS_KC_HARDPPS 0 /* hardpps() (or equivalent) */

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#define PPS_KC_HARDPPS_PLL 1 /* hardpps() constrained to

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use a phase-locked loop */

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#define PPS_KC_HARDPPS_FLL 2 /* hardpps() constrained to

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use a frequency-locked loop */

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* Here begins the implementation-specific part!

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struct pps_fdata {

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struct pps_kinfo info;

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struct pps_ktime timeout;

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};

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struct pps_fdata_compat {

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struct pps_kinfo_compat info;

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struct pps_ktime_compat timeout;

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};

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struct pps_bind_args {

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int tsformat; /* format of time stamps */

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int edge; /* selected event type */

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int consumer; /* selected kernel consumer */

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};

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#include <linux/ioctl.h>

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#define PPS_GETPARAMS _IOR('p', 0xa1, struct pps_kparams *)

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#define PPS_SETPARAMS _IOW('p', 0xa2, struct pps_kparams *)

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#define PPS_GETCAP _IOR('p', 0xa3, int *)

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#define PPS_FETCH _IOWR('p', 0xa4, struct pps_fdata *)

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#define PPS_KC_BIND _IOW('p', 0xa5, struct pps_bind_args *)

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#endif /* _PPS_H_ */

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