/*  * 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. */ /* *  keyboard scan code input from outside the kernel. *  to avoid duplication of keyboard map processing for usb. */ #include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" extern	void kbdputsc(int, int); enum {	Qdir,	Qkbd,}; Dirtab kbintab[] = {	".",	{Qdir, 0, QTDIR},	0,	0555,	"kbin",	{Qkbd, 0},		0,	0200,}; Lock	kbinlck;int	kbinbusy; static Chan *kbinattach(char *spec){	return devattach(L'Ι', spec);} static Walkqid*kbinwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, kbintab, nelem(kbintab), devgen);} static intkbinstat(Chan *c, uchar *dp, int n){	return devstat(c, dp, n, kbintab, nelem(kbintab), devgen);} static Chan*kbinopen(Chan *c, int omode){	if(!iseve())		error(Eperm);	if(c->qid.path == Qkbd){		lock(&kbinlck);		if(kbinbusy){			unlock(&kbinlck);			error(Einuse);		}		kbinbusy++;		unlock(&kbinlck);	}	return devopen(c, omode, kbintab, nelem(kbintab), devgen);} static voidkbinclose(Chan *c){	if(c->aux){		free(c->aux);		c->aux = nil;	}	if(c->qid.path == Qkbd)		kbinbusy = 0;} static longkbinread(Chan *c, void *a, long n, vlong ){	if(c->qid.type == QTDIR)		return devdirread(c, a, n, kbintab, nelem(kbintab), devgen);	return 0;} static longkbinwrite(Chan *c, void *a, long n, vlong){	int i;	uchar *p = a; 	if(c->qid.type == QTDIR)		error(Eisdir);	switch((int)c->qid.path){	case Qkbd:		for(i = 0; i < n; i++)			kbdputsc(*p++, 1);	/* external source */		break;	default:		error(Egreg);	}	return n;} Dev kbindevtab = {	L'Ι',	"kbin", 	devreset,	devinit,	devshutdown,	kbinattach,	kbinwalk,	kbinstat,	kbinopen,	devcreate,	kbinclose,	kbinread,	devbread,	kbinwrite,	devbwrite,	devremove,	devwstat,};