/*  * 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. */ /* * omap35 display subsystem (dss) device interface to screen.c. * implements #v/vgactl */#include "u.h"#include "../port/lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h"#include "ureg.h"#include "../port/error.h" #define	Image	IMAGE#include <draw.h>#include <memdraw.h>#include <cursor.h>#include "screen.h"// #include "gamma.h" enum {	Qdir,	Qdss,}; extern OScreen oscreen;extern Settings settings[];extern Omap3fb *framebuf; static QLock dsslck;static Dirtab dsstab[] = {	".",		{Qdir, 0, QTDIR},	0,	0555|DMDIR,	"vgactl",	{Qdss, 0},		0,	0666,}; static Chan*screenattach(char *spec){	return devattach('v', spec);} static Walkqid*screenwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, dsstab, nelem(dsstab), devgen);} static intscreenstat(Chan *c, uchar *dp, int n){	return devstat(c, dp, n, dsstab, nelem(dsstab), devgen);} static Chan*screenopen(Chan *c, int omode){	if ((ulong)c->qid.path == Qdss) {		qlock(&dsslck);		oscreen.open = 1;		c->mode = openmode(omode);		c->flag |= COPEN;		c->offset = 0;	}	return c;} static voidscreenclose(Chan *c){	if ((c->qid.type & QTDIR) == 0 && c->flag & COPEN)		if (c->qid.path == Qdss) {			oscreen.open = 0;			qunlock(&dsslck);		}} static ulonggetchans(char *p){	if (strncmp("x24" , p, 3) == 0)		return RGB24;		/* can't work yet, pixels are shorts */	else if (strncmp("x16", p, 3) == 0)		return RGB16;	else		return RGB16;} static longsettingswrite(OScreen *scr, char *p){	if (strncmp("800x600", p, 7) == 0) {		p += 7;		scr->settings = &settings[Res800x600];	} else if (strncmp("1024x768", p, 8) == 0) {		p += 8;		scr->settings = &settings[Res1024x768];	} else if (strncmp("1280x1024", p, 9) == 0) {		p += 9;		scr->settings = &settings[Res1280x1024];	} else		return -1;	scr->settings->chan = getchans(p);	return 1;} static longscreenread(Chan *c, void *a, long n, vlong off){	int len, depth;	char *p;	Settings *set; 	switch ((ulong)c->qid.path) {	case Qdir:		return devdirread(c, a, n, dsstab, nelem(dsstab), devgen);	case Qdss:		set = oscreen.settings;		p = malloc(READSTR);		if(waserror()){			free(p);			nexterror();		}		if (set->chan == RGB16)			depth = 16;		else if (set->chan == RGB24)			depth = 24;		else			depth = 0;		len = snprint(p, READSTR, "size %dx%dx%d @ %d Hz\n"			"addr %#p size %ud\n", set->wid, set->ht, depth,			set->freq, framebuf, sizeof *framebuf);		USED(len);		n = readstr(off, a, n, p);		poperror();		free(p);		return n;	default:		error(Egreg);	}	return 0;} static longscreenwrite(Chan *c, void *a, long n, vlong off){	switch ((ulong)c->qid.path) {	case Qdss:		if(off)			error(Ebadarg);		n = settingswrite(&oscreen, a);		if (n < 0)			error(Ebadctl);		screeninit();		return n;	default:		error(Egreg);	}	return 0;} Dev dssdevtab = {	L'v',	"dss", 	devreset,	devinit,	devshutdown,		// TODO add a shutdown to stop dma to monitor	screenattach,	screenwalk,	screenstat,	screenopen,	devcreate,	screenclose,	screenread,	devbread,	screenwrite,	devbwrite,	devremove,	devwstat,};