/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * raspberry pi doesn't have a realtime clock * fake a crude approximation from the kernel build time */ #include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" enum{	Qdir = 0,	Qrtc,}; Dirtab rtcdir[]={	".",	{Qdir, 0, QTDIR},	0,	0555,	"rtc",		{Qrtc, 0},	0,	0664,}; extern ulong kerndate; static ulong rtcsecs; static voidrtctick(void){	rtcsecs++;} static voidrtcinit(void){	rtcsecs = kerndate;	addclock0link(rtctick, 1000);} static longrtcread(Chan *c, void *a, long n, vlong offset){	if(c->qid.type & QTDIR)		return devdirread(c, a, n, rtcdir, nelem(rtcdir), devgen); 	switch((ulong)c->qid.path){	case Qrtc:		return readnum((ulong)offset, a, n, rtcsecs, 12);	}	error(Ebadarg);	return 0;} static longrtcwrite(Chan*c, void *a, long n, vlong){	char b[13];	ulong i; 	switch((ulong)c->qid.path){	case Qrtc:		if(n >= sizeof(b))			error(Ebadarg);		strncpy(b, (char*)a, n);		i = strtol(b, 0, 0);		if(i <= 0)			error(Ebadarg);		rtcsecs = i;		return n;	}	error(Eperm);	return 0;} static Chan*rtcattach(char* spec){	return devattach('r', spec);} static Walkqid*	 rtcwalk(Chan* c, Chan *nc, char** name, int nname){	return devwalk(c, nc, name, nname, rtcdir, nelem(rtcdir), devgen);} static int	 rtcstat(Chan* c, uchar* dp, int n){	return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen);} static Chan*rtcopen(Chan* c, int omode){	return devopen(c, omode, rtcdir, nelem(rtcdir), devgen);} static void	 rtcclose(Chan*){} Dev fakertcdevtab = {	'r',	"rtc", 	devreset,	rtcinit,	devshutdown,	rtcattach,	rtcwalk,	rtcstat,	rtcopen,	devcreate,	rtcclose,	rtcread,	devbread,	rtcwrite,	devbwrite,	devremove,	devwstat,};