#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" #include "io.h"  enum{	Qdir,	Qled,}; staticDirtab cerftab[]={	".",			{Qdir, 0, QTDIR},	0,	0555,	"cerfled",		{Qled, 0},	0,	0660,}; static voidcerfinit(void)						/* default in dev.c */{	int s; 	s = splhi();	GPIOREG->gpdr |= 0xF;	GPIOREG->gpsr = 1<<0;	/* we're here */	splx(s);} static Chan*cerfattach(char* spec){	return devattach('T', spec);} static Walkqid*cerfwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, cerftab, nelem(cerftab), devgen);} static intcerfstat(Chan* c, uchar *db, int n){	return devstat(c, db, n, cerftab, nelem(cerftab), devgen);} static Chan*cerfopen(Chan* c, int omode){	return devopen(c, omode, cerftab, nelem(cerftab), devgen);} static voidcerfclose(Chan* c){	USED(c);} static longcerfread(Chan* c, void* a, long n, vlong offset){	char buf[16]; 	switch((ulong)c->qid.path){	case Qdir:		return devdirread(c, a, n, cerftab, nelem(cerftab), devgen);	case Qled:		snprint(buf, sizeof(buf), "%2.2lux", GPIOREG->gplr&0xF);		return readstr(offset, a, n, buf);	default:		n=0;		break;	}	return n;} static longcerfwrite(Chan* c, void* a, long n, vlong){	char buf[16];	ulong v; 	switch((ulong)c->qid.path){	case Qled:		if(n >= sizeof(buf))			n = sizeof(buf)-1;		memmove(buf, a, n);		buf[n] = 0;		v = GPIOREG->gplr & 0xF;		if(buf[0] == '+')			v |= strtoul(buf+1, nil, 0);		else if(buf[0] == '-')			v &= ~strtoul(buf+1, nil, 0);		else			v = strtoul(buf, nil, 0);		GPIOREG->gpsr = v & 0xF;		GPIOREG->gpcr = ~v & 0xF;		break;	default:		error(Ebadusefd);	}	return n;} Dev cerfdevtab = {	'T',	"cerf", 	devreset,	cerfinit,	devshutdown,	cerfattach,	cerfwalk,	cerfstat,	cerfopen,	devcreate,	cerfclose,	cerfread,	devbread,	cerfwrite,	devbwrite,	devremove,	devwstat,};