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