#include <u.h>#include <libc.h>#include <thread.h>#include "usb.h" /* * epN.M -> N */static intnameid(char *s){	char *r;	char nm[20]; 	r = strrchr(s, 'p');	if(r == nil)		return -1;	strecpy(nm, nm+sizeof(nm), r+1);	r = strchr(nm, '.');	if(r == nil)		return -1;	*r = 0;	return atoi(nm);} Dev*openep(Dev *d, Ep *ep){	char *mode;	/* How many modes? */	Dev *epd;	char name[40]; 	if(d->cfd < 0 || d->usb == nil){		werrstr("device not configured");		return nil;	}	snprint(name, sizeof(name), "/dev/usb/ep%d.%d", d->id, ep->id);	if(access(name, AEXIST) == 0){		dprint(2, "%s: %s already exists; trying to open\n", argv0, name);		epd = opendev(name);	} else {		mode = "rw";		if(ep->dir == Ein)			mode = "r";		if(ep->dir == Eout)			mode = "w";		if(devctl(d, "new %d %d %s", ep->id, ep->type, mode) < 0){			dprint(2, "%s: %s: new: %r\n", argv0, d->dir);			return nil;		}		epd = opendev(name);	}	if(epd == nil)		return nil;	epd->ep = ep;	epd->id = ep->id;	if(devctl(epd, "maxpkt %d", ep->maxpkt) < 0)		fprint(2, "%s: %s: openep: maxpkt: %r\n", argv0, epd->dir);	else		dprint(2, "%s: %s: maxpkt %d\n", argv0, epd->dir, ep->maxpkt);	epd->maxpkt = ep->maxpkt;	if(ep->ntds > 1 && devctl(epd, "ntds %d", ep->ntds) < 0)		fprint(2, "%s: %s: openep: ntds: %r\n", argv0, epd->dir);	else		dprint(2, "%s: %s: ntds %d\n", argv0, epd->dir, ep->ntds);	if((ep->type == Eintr || ep->type == Eiso) && ep->pollival != 0)		if(devctl(epd, "pollival %d", ep->pollival) < 0)			fprint(2, "%s: %s: openep: pollival: %r\n", argv0, epd->dir);	return epd;} Dev*opendev(char *fn){	Dev *d;	int l; 	d = emallocz(sizeof(Dev), 1);	incref(d); 	l = strlen(fn);	d->dfd = -1;	/*	 * +30 to allocate extra size to concat "/<epfilename>"	 * we should probably remove that feature from the manual	 * and from the code after checking out that nobody relies on	 * that.	 */	d->dir = emallocz(l + 30, 0);	strcpy(d->dir, fn);	strcpy(d->dir+l, "/ctl");	d->cfd = open(d->dir, ORDWR|OCEXEC);	d->dir[l] = 0;	d->ep = nil;	d->id = nameid(fn);	if(d->cfd < 0){		werrstr("can't open endpoint %s: %r", d->dir);		free(d->dir);		free(d);		return nil;	}	d->hname = nil;	dprint(2, "%s: opendev %#p %s\n", argv0, d, fn);	return d;} intopendevdata(Dev *d, int mode){	char buf[80]; /* more than enough for a usb path */ 	seprint(buf, buf+sizeof(buf), "%s/data", d->dir);	d->dfd = open(buf, mode|OCEXEC);	return d->dfd;} enum{	/*	 * Max device conf is also limited by max control request size as	 * limited by Maxctllen in the kernel usb.h (both limits are arbitrary).	 * Some devices ignore the high byte of control transfer reads so keep	 * the low byte all ones. asking for 16K kills Newsham's disk.	 */	Maxdevconf = 4*1024 - 1,}; intloaddevconf(Dev *d, int n){	uchar *buf;	int nr;	int type; 	if(n >= nelem(d->usb->conf)){		werrstr("loaddevconf: bug: out of configurations in device");		fprint(2, "%s: %r\n", argv0);		return -1;	}	buf = emallocz(Maxdevconf, 0);	type = Rd2h|Rstd|Rdev;	nr = usbcmd(d, type, Rgetdesc, Dconf<<8|n, 0, buf, Maxdevconf);	if(nr < Dconflen){		free(buf);		return -1;	}	if(d->usb->conf[n] == nil)		d->usb->conf[n] = emallocz(sizeof(Conf), 1);	nr = parseconf(d->usb, d->usb->conf[n], buf, nr);	free(buf);	return nr;} Ep*mkep(Usbdev *d, int id){	Ep *ep; 	ep = emallocz(sizeof(Ep), 1);	ep->id = id; 	id &= Epmax;	ep->next = d->ep[id];	d->ep[id] = ep; 	return ep;} static char*mkstr(uchar *b, int n){	Rune r;	char *us;	char *s; 	if(n > 0 && n > b[0])		n = b[0];	if(n <= 2 || (n & 1) != 0)		return strdup("none");	n = (n - 2)/2;	b += 2;	us = s = emallocz(n*UTFmax+1, 0);	for(; --n >= 0; b += 2){		r = GET2(b);		s += runetochar(s, &r);	}	*s = 0;	return us;} char*loaddevstr(Dev *d, int sid){	uchar buf[256-2];	/* keep size < 256 */	int langid;	int type;	int nr; 	if(sid == 0)		return estrdup("none");	type = Rd2h|Rstd|Rdev; 	/*	 * there are devices which do not return a string if used	 * with invalid language id, so at least try to use the first	 * one and choose english if failed	 */	nr=usbcmd(d, type, Rgetdesc, Dstr<<8, 0, buf, sizeof(buf));	if(nr < 4)		langid = 0x0409;	// english	else		langid = buf[3]<<8|buf[2]; 	nr=usbcmd(d, type, Rgetdesc, Dstr<<8|sid, langid, buf, sizeof(buf));	return mkstr(buf, nr);} intloaddevdesc(Dev *d){	uchar buf[Ddevlen];	int nr;	int type;	Ep *ep0; 	type = Rd2h|Rstd|Rdev;	nr = sizeof(buf);	memset(buf, 0, nr);	if((nr=usbcmd(d, type, Rgetdesc, Ddev<<8|0, 0, buf, nr)) < 0)		return -1;	/*	 * Several hubs are returning descriptors of 17 bytes, not 18.	 * We accept them and leave number of configurations as zero.	 * (a get configuration descriptor also fails for them!)	 */	if(nr < Ddevlen){		dprint(2, "%s: %s: warning: device with short descriptor (got %d bytes)\n",			argv0, d->dir, nr);		if(nr < Ddevlen-1){			werrstr("short device descriptor (%d bytes)", nr);			return -1;		}	}	d->usb = emallocz(sizeof(Usbdev), 1);	ep0 = mkep(d->usb, 0);	ep0->dir = Eboth;	ep0->type = Econtrol;	ep0->maxpkt = d->maxpkt = 8;		/* a default */	d->ep = ep0;	nr = parsedev(d, buf, nr);	if(nr >= 0){		d->usb->vendor = loaddevstr(d, d->usb->vsid);		if(strcmp(d->usb->vendor, "none") != 0){			d->usb->product = loaddevstr(d, d->usb->psid);			d->usb->serial = loaddevstr(d, d->usb->ssid);		}	}	return nr;} intconfigdev(Dev *d){	int i; 	if(d->dfd < 0)		opendevdata(d, ORDWR);	if(d->dfd < 0)		return -1;	if(loaddevdesc(d) < 0)		return -1;	for(i = 0; i < d->usb->nconf; i++)		if(loaddevconf(d, i) < 0)			return -1;	return 0;} static voidcloseconf(Conf *c){	Iface *f;	int i; 	if(c == nil)		return;	for(i = 0; i < nelem(c->iface); i++){		while((f = c->iface[i]) != nil) {			c->iface[i] = f->next;			free(f);		}	}	free(c);} voidclosedev(Dev *d){	int i;	Ep *ep;	Usbdev *ud; 	if(d==nil || decref(d) != 0)		return;	dprint(2, "%s: closedev %#p %s\n", argv0, d, d->dir);	if(d->cfd >= 0)		close(d->cfd);	if(d->dfd >= 0)		close(d->dfd);	d->cfd = d->dfd = -1;	free(d->dir);	d->dir = nil;	free(d->hname);	d->hname = nil;	ud = d->usb;	d->usb = nil;	if(ud != nil){		free(ud->vendor);		free(ud->product);		free(ud->serial);		for(i = 0; i < nelem(ud->ep); i++){			while((ep = ud->ep[i]) != nil){				ud->ep[i] = ep->next;				free(ep);			}		}		for(i = 0; i < nelem(ud->ddesc); i++)			free(ud->ddesc[i]);		for(i = 0; i < nelem(ud->conf); i++)			closeconf(ud->conf[i]);		free(ud);	}	free(d);} static char*reqstr(int type, int req){	char *s;	static char* ds[] = { "dev", "if", "ep", "oth" };	static char buf[40]; 	if(type&Rd2h)		s = seprint(buf, buf+sizeof(buf), "d2h");	else		s = seprint(buf, buf+sizeof(buf), "h2d");	if(type&Rclass)		s = seprint(s, buf+sizeof(buf), "|cls");	else if(type&Rvendor)		s = seprint(s, buf+sizeof(buf), "|vnd");	else		s = seprint(s, buf+sizeof(buf), "|std");	s = seprint(s, buf+sizeof(buf), "|%s", ds[type&3]); 	switch(req){	case Rgetstatus: s = seprint(s, buf+sizeof(buf), " getsts"); break;	case Rclearfeature: s = seprint(s, buf+sizeof(buf), " clrfeat"); break;	case Rsetfeature: s = seprint(s, buf+sizeof(buf), " setfeat"); break;	case Rsetaddress: s = seprint(s, buf+sizeof(buf), " setaddr"); break;	case Rgetdesc: s = seprint(s, buf+sizeof(buf), " getdesc"); break;	case Rsetdesc: s = seprint(s, buf+sizeof(buf), " setdesc"); break;	case Rgetconf: s = seprint(s, buf+sizeof(buf), " getcnf"); break;	case Rsetconf: s = seprint(s, buf+sizeof(buf), " setcnf"); break;	case Rgetiface: s = seprint(s, buf+sizeof(buf), " getif"); break;	case Rsetiface: s = seprint(s, buf+sizeof(buf), " setif"); break;	}	USED(s);	return buf;} static intcmdreq(Dev *d, int type, int req, int value, int index, uchar *data, int count){	int ndata, n;	uchar *wp;	uchar buf[8]; 	assert(d != nil);	if(data == nil){		wp = buf;		ndata = 0;	}else{		ndata = count;		wp = emallocz(8+ndata, 0);		memmove(wp+8, data, ndata);	}	wp[0] = type;	wp[1] = req;	PUT2(wp+2, value);	PUT2(wp+4, index);	PUT2(wp+6, count);	if(usbdebug>2){		fprint(2, "%s: %s val %d|%d idx %d cnt %d out[%d] %.*H\n",			d->dir, reqstr(type, req), value>>8, value&0xFF,			index, count, ndata+8,			ndata+8, wp);	}	n = write(d->dfd, wp, 8+ndata);	if(wp != buf)		free(wp);	if(n < 0)		return -1;	if(n != 8+ndata){		dprint(2, "%s: cmd: short write: %d\n", argv0, n);		return -1;	}	return ndata;} static intcmdrep(Dev *d, void *buf, int nb){	nb = read(d->dfd, buf, nb);	if(nb > 0 && usbdebug > 2)		fprint(2, "%s: in[%d] %.*H\n", d->dir, nb, nb, buf);	return nb;} intusbcmd(Dev *d, int type, int req, int value, int index, uchar *data, int count){	char err[ERRMAX];	int r, tries; 	/*	 * Some devices do not respond to commands some times.	 * Others even report errors but later work just fine. Retry.	 */	*err = 0;	for(tries = 1;; tries++){		if(type & Rd2h)			r = cmdreq(d, type, req, value, index, nil, count);		else			r = cmdreq(d, type, req, value, index, data, count);		if(r >= 0){			if((type & Rd2h) == 0)				break;			r = cmdrep(d, data, count);			if(r > 0)				break;			if(r == 0)				werrstr("no data from device");		}		if(*err == 0)			rerrstr(err, sizeof(err));		if(tries >= Uctries)			break;		sleep(Ucdelay);	}	if(r >= 0 && tries > 1)		/* let the user know the device is not in good shape */		fprint(2, "%s: usbcmd: %s: %s required %d attempts (%s)\n",			argv0, d->dir, reqstr(type, req), tries, err);	return r;} intunstall(Dev *dev, Dev *ep, int dir){	int r; 	if(dir == Ein)		dir = 0x80;	else		dir = 0;	r = Rh2d|Rstd|Rep;	if(usbcmd(dev, r, Rclearfeature, Fhalt, (ep->id&0xF)|dir, nil, 0)<0){		werrstr("unstall: %s: %r", ep->dir);		return -1;	}	if(devctl(ep, "clrhalt") < 0){		werrstr("clrhalt: %s: %r", ep->dir);		return -1;	}	return 0;} intsetconf(Dev *d, Conf *c){	if(usbcmd(d, Rh2d|Rstd|Rdev, Rsetconf, c->cval, 0, nil, 0) > 0) {		werrstr("setconf: %s: %r", d->dir);		return -1;	}	return 0;} intsetalt(Dev *d, Iface *ifc){	if(usbcmd(d, Rh2d|Rstd|Riface, Rsetiface, ifc->alt, ifc->id, nil, 0) < 0){		werrstr("setalt: %s: %r", d->dir);		return -1;	}	return 0;} /* * To be sure it uses a single write. */int

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