[sane-devel] Hai, about probe_scanner can't be probed

[Fan Dan]

Hai, Henning

    Today, I modified scanner.c for Mustek A3Pro usb scanner (0x055f 
0x0401)
In probe_scanner.
modified
have_bulk_in = 1
have_bulk_out =2
have_intr = 3
to 
have_bulk_in = 0
have_bulk_out = 1
have_bulk_intr = 2

/////////////////////////////////////////
+ have_bulk_in--
+ have_bulk_out--
+ have_intr--
if (!(scn = kmalloc (sizeof (struct scn_usb_data), GFP_KERNEL))) {
		err("probe_scanner: Out of memory.");
		up(&scn_mutex);
		return NULL;
	}
	memset (scn, 0, sizeof(struct scn_usb_data));

	init_MUTEX(&(scn->sem)); /* Initializes to unlocked */
/////////////////////////////////////////

then scanner that has three endpoints can be probed successly, because 
maxpacketout[3] = 0, but maxpacketout[2] = 1 in USB module; 

And scanner can be writed, but we can't read  from that. so I midified some 
code int read_scanner function.
//////////////////////////////////////////////////////
- result = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, scn->bulk_in_ep), ibuf, 
this_read, &partial, scn->rd_nak_timeout);
+ result = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, scn->bulk_out_ep), ibuf, 
this_read, &partial, scn->rd_nak_timeout);
/////////////////////////////////////////////////////
Then scanner can be write and read.

I have test that we can write some bytes to DRAM of scanner, then read them 
for scanner, that is OK. ioctl also is OK.

I want to know that there are three endpoint in scanner, but why both in 
bulk and out bulk are in same ep? Whether is that OK??

Good Lucky!

Dan  

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