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/*
* generic CDC
*/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <ip.h>
#include "usb.h"
#include "dat.h"
static int
cdcread(Dev *ep, uchar *p, int n)
{
return read(ep->dfd, p, n);
}
static void
cdcwrite(Dev *ep, uchar *p, int n)
{
if(write(ep->dfd, p, n) < 0){
fprint(2, "cdcwrite: %r\n");
} else {
/*
* this may not work with all CDC devices. the
* linux driver sends one more random byte
* instead of a zero byte transaction. maybe we
* should do the same?
*/
if(n % ep->maxpkt == 0)
write(ep->dfd, "", 0);
}
}
int
cdcinit(Dev *d)
{
int i;
Usbdev *ud;
uchar *b;
Desc *dd;
char *mac;
ud = d->usb;
for(i = 0; i < nelem(ud->ddesc); i++)
if((dd = ud->ddesc[i]) != nil){
b = (uchar*)&dd->data;
if(b[1] == Dfunction && b[2] == Fnether){
mac = loaddevstr(d, b[3]);
if(mac != nil && strlen(mac) != 12){
free(mac);
mac = nil;
}
if(mac != nil){
parseether(macaddr, mac);
free(mac);
epread = cdcread;
epwrite = cdcwrite;
return 0;
}
}
}
return -1;
}
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