ref: 53d55013598d7cd214d01cbf0b026844fe7ca8d2
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;
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->ver = GET2(dd->bcdUSB);
xd->isusb3 = (d->ver >= 0x0300);
if(xd->isusb3)
d->ep[0]->maxpkt = xd->maxpkt = 1<<dd->bMaxPacketSize0;
else
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)
{
int class, subclass, proto, alt, id;
ulong csp;
DIface *dip;
Iface *ip;
if(n < Difacelen){
werrstr("short interface descriptor");
return -1;
}
dip = (DIface *)b;
class = dip->bInterfaceClass;
subclass = dip->bInterfaceSubClass;
proto = dip->bInterfaceProtocol;
csp = CSP(class, subclass, proto);
if(csp == 0)
csp = d->csp;
if(d->class == 0)
d->class = class;
alt = dip->bAlternateSetting;
id = dip->bInterfaceNumber;
if(id < 0 || id >= nelem(c->iface)){
werrstr("bad interface number %d", id);
return -1;
}
for(ip = c->iface[id]; ip != nil; ip = ip->next)
if(ip->csp == csp && ip->alt == alt)
goto Found;
ip = emallocz(sizeof(Iface), 1);
ip->id = id;
ip->csp = csp;
ip->alt = alt;
ip->next = c->iface[id];
c->iface[id] = ip;
if(d->csp == 0) /* use csp from 1st iface */
d->csp = ip->csp; /* if device has none */
if(c == d->conf[0] && id == 0) /* ep0 was already there */
d->ep[0]->iface = ip;
Found:
*ipp = ip;
return Difacelen;
}
extern Ep* mkep(Usbdev *, int);
static int
parseendpt(Usbdev *d, Conf *c, Iface *ip, uchar *b, int n, Ep **epp)
{
int addr, dir, type, id, i;
DEp *dep;
Ep *ep;
if(n < Deplen){
werrstr("short endpoint descriptor");
return -1;
}
dep = (DEp *)b;
type = dep->bmAttributes & 0x03;
addr = dep->bEndpointAddress;
if(addr & 0x80)
dir = Ein;
else
dir = Eout;
/*
* the endpoint id is created once, setting
* type and direction, meaning the endpoint's
* id must be unique for (type, dir) relative
* to all other potential endpoints from
* interfaces/altsettings on this device.
*
* the low Epmax bits of the id contains the
* endpoint address that must be preserved.
*/
id = addr & Epmax;
Again:
for(ep = d->ep[id & Epmax]; ep != nil; ep = ep->next){
if(ep->id != id)
continue;
if(ep->type != type){
id += Epmax+1;
goto Again;
}
if(ep->dir == dir)
break;
/*
* Ein/Eout endpoints from the same
* interface/altsetting can be merged
* into one. (except for iso).
*/
if(ep->iface != ip || type == Eiso){
id += Epmax+1;
goto Again;
}
dir = Eboth;
break;
}
if(ep == nil || ep->iface != ip)
ep = mkep(d, id);
ep->dir = dir;
ep->type = type;
ep->iface = ip;
ep->conf = c;
ep->maxpkt = GET2(dep->wMaxPacketSize);
ep->ntds = 1 + ((ep->maxpkt >> 11) & 3);
ep->maxpkt &= 0x7FF;
ep->attrib = dep->bmAttributes;
ep->pollival = dep->bInterval;
for(i = 0; i < nelem(ip->ep); i++){
if(ip->ep[i] == nil){
ip->ep[i] = ep;
break;
}
if(ip->ep[i] == ep)
break;
}
if(i >= nelem(ip->ep))
fprint(2, "%s: parseendpt: too many endpoints in interface", argv0);
*epp = ep;
return Deplen;
}
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;
char *hd;
tot = 0;
ip = nil;
ep = 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) < 0){
ddprint(2, "%s\tparsedesc: %r\n", argv0);
return -1;
}
break;
case Dep:
if(ip == nil){
werrstr("unexpected endpoint descriptor");
break;
}
if(parseendpt(d, c, ip, 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]->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;
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;
}