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151 lines
4.6 KiB
151 lines
4.6 KiB
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
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/* |
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* PPS API header |
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* |
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* Copyright (C) 2005-2009 Rodolfo Giometti <[email protected]> |
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* |
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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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* |
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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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* |
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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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*/ |
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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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/* |
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* 3.2 New data structures |
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*/ |
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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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* |
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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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* |
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* The simple fix is probably to add an explicit padding. |
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* [David Woodhouse] |
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*/ |
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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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/* |
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* 3.3 Mode bit definitions |
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*/ |
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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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/* |
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* 3.4.4 New functions: disciplining the kernel timebase |
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*/ |
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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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/* |
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* Here begins the implementation-specific part! |
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*/ |
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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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