ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/nusb/lib/parse.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "usb.h"
int
parsedev(Dev *xd, uchar *b, int n)
{
Usbdev *d;
DDev *dd;
char *hd;
d = xd->usb;
assert(d != nil);
dd = (DDev*)b;
if(usbdebug>1){
hd = hexstr(b, Ddevlen);
fprint(2, "%s: parsedev %s: %s\n", argv0, xd->dir, hd);
free(hd);
}
if(dd->bLength < Ddevlen){
werrstr("short dev descr. (%d < %d)", dd->bLength, Ddevlen);
return -1;
}
if(dd->bDescriptorType != Ddev){
werrstr("%d is not a dev descriptor", dd->bDescriptorType);
return -1;
}
d->csp = CSP(dd->bDevClass, dd->bDevSubClass, dd->bDevProtocol);
d->ep[0]->maxpkt = xd->maxpkt = dd->bMaxPacketSize0;
d->class = dd->bDevClass;
d->nconf = dd->bNumConfigurations;
if(d->nconf == 0)
dprint(2, "%s: %s: no configurations\n", argv0, xd->dir);
d->vid = GET2(dd->idVendor);
d->did = GET2(dd->idProduct);
d->dno = GET2(dd->bcdDev);
d->vsid = dd->iManufacturer;
d->psid = dd->iProduct;
d->ssid = dd->iSerialNumber;
if(n > Ddevlen && usbdebug>1)
fprint(2, "%s: %s: parsedev: %d bytes left",
argv0, xd->dir, n - Ddevlen);
return Ddevlen;
}
static int
parseiface(Usbdev *d, Conf *c, uchar *b, int n, Iface **ipp, Altc **app)
{
int class, subclass, proto;
int ifid, altid;
DIface *dip;
Iface *ip;
assert(d != nil && c != nil);
if(n < Difacelen){
werrstr("short interface descriptor");
return -1;
}
dip = (DIface *)b;
ifid = dip->bInterfaceNumber;
if(ifid < 0 || ifid >= nelem(c->iface)){
werrstr("bad interface number %d", ifid);
return -1;
}
if(c->iface[ifid] == nil)
c->iface[ifid] = emallocz(sizeof(Iface), 1);
ip = c->iface[ifid];
class = dip->bInterfaceClass;
subclass = dip->bInterfaceSubClass;
proto = dip->bInterfaceProtocol;
ip->csp = CSP(class, subclass, proto);
if(ip->csp == 0)
ip->csp = d->csp;
if(d->csp == 0) /* use csp from 1st iface */
d->csp = ip->csp; /* if device has none */
if(d->class == 0)
d->class = class;
ip->id = ifid;
if(c == d->conf[0] && ifid == 0) /* ep0 was already there */
d->ep[0]->iface = ip;
altid = dip->bAlternateSetting;
if(altid < 0 || altid >= nelem(ip->altc)){
werrstr("bad alternate conf. number %d", altid);
return -1;
}
if(ip->altc[altid] == nil)
ip->altc[altid] = emallocz(sizeof(Altc), 1);
*ipp = ip;
*app = ip->altc[altid];
return Difacelen;
}
extern Ep* mkep(Usbdev *, int);
static int
parseendpt(Usbdev *d, Conf *c, Iface *ip, Altc *altc, uchar *b, int n, Ep **epp)
{
int i, dir, epid, type, addr;
Ep *ep;
DEp *dep;
assert(d != nil && c != nil && ip != nil && altc != nil);
if(n < Deplen){
werrstr("short endpoint descriptor");
return -1;
}
dep = (DEp *)b;
altc->attrib = dep->bmAttributes; /* here? */
altc->interval = dep->bInterval;
type = dep->bmAttributes & 0x03;
addr = dep->bEndpointAddress;
if(addr & 0x80)
dir = Ein;
else
dir = Eout;
epid = addr & 0xF; /* default map to 0..15 */
assert(epid < nelem(d->ep));
ep = d->ep[epid];
if(ep == nil){
ep = mkep(d, epid);
ep->dir = dir;
}else if((ep->addr & 0x80) != (addr & 0x80)){
if(ep->type == type)
ep->dir = Eboth;
else {
/*
* resolve conflict when same endpoint number
* is used for different input and output types.
* map input endpoint to 16..31 and output to 0..15.
*/
ep->id = ((ep->addr & 0x80) != 0)<<4 | (ep->addr & 0xF);
d->ep[ep->id] = ep;
epid = ep->id ^ 0x10;
ep = mkep(d, epid);
ep->dir = dir;
}
}
ep->maxpkt = GET2(dep->wMaxPacketSize);
ep->ntds = 1 + ((ep->maxpkt >> 11) & 3);
ep->maxpkt &= 0x7FF;
ep->addr = addr;
ep->type = type;
ep->isotype = (dep->bmAttributes>>2) & 0x03;
ep->conf = c;
ep->iface = ip;
for(i = 0; i < nelem(ip->ep); i++)
if(ip->ep[i] == nil)
break;
if(i == nelem(ip->ep)){
werrstr("parseendpt: bug: too many end points on interface "
"with csp %#lux", ip->csp);
fprint(2, "%s: %r\n", argv0);
return -1;
}
*epp = ip->ep[i] = ep;
return Dep;
}
static char*
dname(int dtype)
{
switch(dtype){
case Ddev: return "device";
case Dconf: return "config";
case Dstr: return "string";
case Diface: return "interface";
case Dep: return "endpoint";
case Dreport: return "report";
case Dphysical: return "phys";
default: return "desc";
}
}
int
parsedesc(Usbdev *d, Conf *c, uchar *b, int n)
{
int len, nd, tot;
Iface *ip;
Ep *ep;
Altc *altc;
char *hd;
assert(d != nil && c != nil);
tot = 0;
ip = nil;
ep = nil;
altc = nil;
for(nd = 0; nd < nelem(d->ddesc); nd++)
if(d->ddesc[nd] == nil)
break;
while(n > 2 && b[0] != 0 && b[0] <= n){
len = b[0];
if(usbdebug>1){
hd = hexstr(b, len);
fprint(2, "%s:\t\tparsedesc %s %x[%d] %s\n",
argv0, dname(b[1]), b[1], b[0], hd);
free(hd);
}
switch(b[1]){
case Ddev:
case Dconf:
werrstr("unexpected descriptor %d", b[1]);
ddprint(2, "%s\tparsedesc: %r", argv0);
break;
case Diface:
if(parseiface(d, c, b, n, &ip, &altc) < 0){
ddprint(2, "%s\tparsedesc: %r\n", argv0);
return -1;
}
break;
case Dep:
if(ip == nil || altc == nil){
werrstr("unexpected endpoint descriptor");
break;
}
if(parseendpt(d, c, ip, altc, b, n, &ep) < 0){
ddprint(2, "%s\tparsedesc: %r\n", argv0);
return -1;
}
break;
default:
if(nd == nelem(d->ddesc)){
fprint(2, "%s: parsedesc: too many "
"device-specific descriptors for device"
" %s %s\n",
argv0, d->vendor, d->product);
break;
}
d->ddesc[nd] = emallocz(sizeof(Desc)+b[0], 0);
d->ddesc[nd]->iface = ip;
d->ddesc[nd]->ep = ep;
d->ddesc[nd]->altc = altc;
d->ddesc[nd]->conf = c;
memmove(&d->ddesc[nd]->data, b, len);
++nd;
}
n -= len;
b += len;
tot += len;
}
return tot;
}
int
parseconf(Usbdev *d, Conf *c, uchar *b, int n)
{
DConf* dc;
int l;
int nr;
char *hd;
assert(d != nil && c != nil);
dc = (DConf*)b;
if(usbdebug>1){
hd = hexstr(b, Dconflen);
fprint(2, "%s:\tparseconf %s\n", argv0, hd);
free(hd);
}
if(dc->bLength < Dconflen){
werrstr("short configuration descriptor");
return -1;
}
if(dc->bDescriptorType != Dconf){
werrstr("not a configuration descriptor");
return -1;
}
c->cval = dc->bConfigurationValue;
c->attrib = dc->bmAttributes;
c->milliamps = dc->MaxPower*2;
l = GET2(dc->wTotalLength);
if(n < l){
werrstr("truncated configuration info");
return -1;
}
n -= Dconflen;
b += Dconflen;
nr = 0;
if(n > 0 && (nr=parsedesc(d, c, b, n)) < 0)
return -1;
n -= nr;
if(n > 0 && usbdebug>1)
fprint(2, "%s:\tparseconf: %d bytes left\n", argv0, n);
return l;
}