2  * refclock_atom - clock driver for 1-pps signals
25  * This driver furnishes an interface for pulse-per-second (PPS) signals
33  * within +-0.4 s by another means, such as a radio clock or NTP
37  * may require a one-shot flipflop to lengthen the pulse. The other is
41  * This driver requires the Pulse-per-Second API for Unix-like Operating
42  * Systems, Version 1.0, RFC-2783 (PPSAPI). Implementations are
45  * the API with multiple PPS drivers and multiple handles per driver. If
74  * miscellaneous device driver and OS delays.
79 #define DEVICE		"/dev/pps%d" /* device name and unit */  macro
80 #define	PRECISION	(-20)	/* precision assumed (about 1 us) */
110 	atom_timer,		/* called once per second */
115  * atom_start - initialize data for processing
125 	char	device[80];  in atom_start()  local
130 	pp = peer->procptr;  in atom_start()
131 	peer->precision = PRECISION;  in atom_start()
132 	pp->clockdesc = DESCRIPTION;  in atom_start()
133 	pp->stratum = STRATUM_UNSPEC;  in atom_start()
134 	memcpy((char *)&pp->refid, REFID, 4);  in atom_start()
137 	pp->unitptr = up;  in atom_start()
140 	 * Open PPS device. This can be any serial or parallel port and  in atom_start()
143 	snprintf(device, sizeof(device), DEVICE, unit);  in atom_start()
144 	up->fddev = tty_open(device, O_RDWR, 0777);  in atom_start()
145 	if (up->fddev <= 0) {  in atom_start()
147 			"refclock_atom: %s: %m", device);  in atom_start()
154 	return (refclock_ppsapi(up->fddev, &up->atom));  in atom_start()
159  * atom_shutdown - shut down the clock
170 	pp = peer->procptr;  in atom_shutdown()
171 	up = pp->unitptr;  in atom_shutdown()
172 	if (up->fddev > 0)  in atom_shutdown()
173 		close(up->fddev);  in atom_shutdown()
178  * atom_timer - called once per second
190 	pp = peer->procptr;  in atom_timer()
191 	up = pp->unitptr;  in atom_timer()
192 	if (refclock_pps(peer, &up->atom, pp->sloppyclockflag) <= 0)  in atom_timer()
195 	peer->flags |= FLAG_PPS;  in atom_timer()
201 	if (pp->sloppyclockflag & CLK_FLAG4) {  in atom_timer()
203 			 pp->filter[pp->coderecv]);  in atom_timer()
204 		record_clock_stats(&peer->srcadr, tbuf);  in atom_timer()
210  * atom_poll - called by the transmit procedure
227 	pp = peer->procptr;  in atom_poll()
228 	pp->polls++;  in atom_poll()
229 	if (pp->codeproc == pp->coderecv) {  in atom_poll()
230 		peer->flags &= ~FLAG_PPS;  in atom_poll()
234 	pp->lastref = pp->lastrec;  in atom_poll()