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/*
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 * raspberry pi doesn't have a realtime clock
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 * fake a crude approximation from the kernel build time
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 */
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#include	"u.h"
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#include	"../port/lib.h"
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#include	"mem.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"../port/error.h"
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enum{
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	Qdir = 0,
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	Qrtc,
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};
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Dirtab rtcdir[]={
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	".",	{Qdir, 0, QTDIR},	0,	0555,
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	"rtc",		{Qrtc, 0},	0,	0664,
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};
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extern ulong kerndate;
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static ulong rtcsecs;
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static void
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rtctick(void)
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{
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	rtcsecs++;
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}
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static void
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rtcinit(void)
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{
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	rtcsecs = kerndate;
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	addclock0link(rtctick, 1000);
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}
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static long
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rtcread(Chan *c, void *a, long n, vlong offset)
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{
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	if(c->qid.type & QTDIR)
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		return devdirread(c, a, n, rtcdir, nelem(rtcdir), devgen);
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	switch((ulong)c->qid.path){
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	case Qrtc:
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		return readnum((ulong)offset, a, n, rtcsecs, 12);
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	}
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	error(Ebadarg);
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	return 0;
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}
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static long
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rtcwrite(Chan*c, void *a, long n, vlong)
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{
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	char b[13];
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	ulong i;
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	switch((ulong)c->qid.path){
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	case Qrtc:
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		if(n >= sizeof(b))
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			error(Ebadarg);
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		strncpy(b, (char*)a, n);
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		i = strtol(b, 0, 0);
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		if(i <= 0)
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			error(Ebadarg);
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		rtcsecs = i;
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		return n;
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	}
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	error(Eperm);
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	return 0;
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}
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static Chan*
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rtcattach(char* spec)
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{
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	return devattach('r', spec);
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}
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static Walkqid*
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rtcwalk(Chan* c, Chan *nc, char** name, int nname)
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{
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	return devwalk(c, nc, name, nname, rtcdir, nelem(rtcdir), devgen);
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}
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static int
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rtcstat(Chan* c, uchar* dp, int n)
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{
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	return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen);
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}
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static Chan*
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rtcopen(Chan* c, int omode)
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{
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	return devopen(c, omode, rtcdir, nelem(rtcdir), devgen);
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}
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static void
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rtcclose(Chan*)
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{
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}
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Dev fakertcdevtab = {
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	'r',
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	"rtc",
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	devreset,
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	rtcinit,
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	devshutdown,
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	rtcattach,
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	rtcwalk,
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	rtcstat,
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	rtcopen,
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	devcreate,
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	rtcclose,
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	rtcread,
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	devbread,
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	rtcwrite,
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	devbwrite,
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	devremove,
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	devwstat,
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};
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