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nusb/ptp: do maxpkt reads to avoid babble error with usb 2.0 devices (thanks mischief!)

mischief got babble error with his mobile phone as we used to
read at max 64 bytes for the data response phase. his device
has 512 byte packet size.

thans to mischief for the patience.

--- a/sys/src/cmd/nusb/ptp/ptp.c

+++ b/sys/src/cmd/nusb/ptp/ptp.c

@@ -45,7 +45,7 @@

 	uchar	type[2];

 	uchar	code[2];

 	uchar	transid[4];

-	uchar	d[52];

+	uchar	d[500];

 };

 struct Node

@@ -281,7 +281,7 @@

 		*prdata = nil;

 		*prdatalen = 0;

-		while((n = ioread(io, usbep[In]->dfd, &rpc, sizeof(rpc))) <= 0){

+		while((n = ioread(io, usbep[In]->dfd, &rpc, usbep[In]->maxpkt)) <= 0){

 			if(n < 0){

 				wasinterrupt();

 				return -1;

@@ -334,7 +334,7 @@

 		}

 	}

-	while((n = ioread(io, usbep[In]->dfd, &rpc, sizeof(rpc))) <= 0){

+	while((n = ioread(io, usbep[In]->dfd, &rpc, usbep[In]->maxpkt)) <= 0){

 		if(n < 0){

 			wasinterrupt();

 			return -1;

@@ -1028,6 +1028,8 @@

 	}

 	if(usbep[In]->dfd < 0 || usbep[Out]->dfd < 0)

 		sysfatal("open endpoints: %r");

+	if(usbep[In]->maxpkt < 12 || usbep[In]->maxpkt > sizeof(Ptprpc))

+		sysfatal("bad packet size: %d\n", usbep[In]->maxpkt);

 	iochan = chancreate(sizeof(Ioproc*), 1);

 	sendp(iochan, ioproc());

-- 

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