On Thursday 06 July 2006 20:15, Arnaud Quette wrote:
> a good try, and amount of effort.
> Sadly, notifications are on the PIPE_INTERRUPT
Ok, let's do it again.
HIDGetEvents() calls libusb_get_interrupt() with size=20 (hardcoded), which
calls usb_interrupt_read(), then usb_urb_transfer(), which sets
urb.buffer_length=20, going down the ioctl (as uurb), where the kernel urb
struct gets urb.transfer_buffer_length=20. Then, uhci_submit_interrupt()
checks that field with
--------------------
if (urb->transfer_buffer_length > usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe)))
return -EINVAL;
--------------------
What is the endpoint max packet size? According to /proc/bus/usb/devices
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0463 ProdID=ffff Rev= 1.00
S: Manufacturer=MGE UPS SYSTEMS
S: Product=Evolution
S: SerialNumber=AF3G03062
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 40mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=(none)
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=20ms
Assuming that MxPS means max packet size, it seems to be 8, which is
lower than 20, and therefore it looks like the EINVAL error comes from
there. Am I going in the right direction this time?
> If something is not working, you can try to reset the communication: power
> off the UPS, then unplug its power cable, wait (at least) 10 seconds and
> replug/restart all.
Well, that's something I'd like to avoid, since all the institution servers
are fed by the UPS.
Cheers,
Rodrigo
--
*** Rodrigo Martins de Matos Ventura <[EMAIL PROTECTED]>
*** Web page: http://www.isr.ist.utl.pt/~yoda
*** Teaching Assistant and PhD Student at ISR:
*** Instituto de Sistemas e Robotica, Polo de Lisboa
*** Instituto Superior Tecnico, Lisboa, PORTUGAL
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