From: John Homppi Sent: Sunday, December 14, 2003 12:38 PM To: 'Sergey Vlasov' Cc: '[EMAIL PROTECTED]'; '[EMAIL PROTECTED]' Subject: RE: [linux-usb-devel] hid and low-speed devices
Hi Sergey,
This failure mode also occurs with the ADU200 device from Ontrak Control Systems.
The ADU200 is a HID device with no bulk endpoints; only control and interrupt endpoints.
As you pointed out, hid-core.c assumes that all HID devices have a bulk-out endpoint.
Thus the ADU200 appears in the hid_blacklist in hid-core.c
If someone knowledgeable made the change to hid-core.c then I would be willing
to test it. I suspect that the change may not be simple as there may be repercussions in
other areas of the Linux kernel.
I already have code that attempts to use the ADU200 as a HID device (of course it
fails so I have been using my own driver instead.)
Bye, John Homppi
Sergey Vlasov wrote: ---------- From: Sergey Vlasov Sent: Sunday, December 14, 2003 11:14 AM To: Johann Deneux Cc: [EMAIL PROTECTED] Subject: Re: [linux-usb-devel] hid and low-speed devices
<<<original message from Johann Deneux snipped>>>
Seems that the real problem is in hid-core.c:
endpoint = &interface->endpoint[n].desc;
if ((endpoint->bmAttributes & 3) != 3) /* Not an interrupt
endpoint */
continue; if (endpoint->bEndpointAddress & USB_DIR_IN) {
if (hid->urbin)
continue;
if (!(hid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
goto fail;
pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
usb_fill_int_urb(hid->urbin, dev, pipe, hid->inbuf, 0,
hid_irq_in, hid, endpoint->bInterval);
hid->urbin->transfer_dma = hid->inbuf_dma;
hid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
} else {
if (hid->urbout)
continue;
if (!(hid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
goto fail;
pipe = usb_sndbulkpipe(dev, endpoint->bEndpointAddress);
usb_fill_bulk_urb(hid->urbout, dev, pipe, hid->outbuf, 0,
hid_irq_out, hid);
hid->urbout->transfer_dma = hid->outbuf_dma;
hid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
}Notice that for the input endpoint it correctly uses usb_rcvintpipe() and usb_fill_int_urb(), but for the output endpoint usb_sndbulkpipe() and usb_fill_bulk_urb() are used (even though it is really an interrupt endpoint). How could this work?
So it is the HID core which must be fixed. Unfortunately, I don't have any HID device which would have an interrupt out endpoint...
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