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On Tue, 23 Dec 2003 13:10 pm, Froilan A. Olivas wrote:
> C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=03(HID ) Sub=00 Prot=00
> Driver=hid
> E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms
> E: Ad=01(O) Atr=03(Int.) MxPS= 8 Ivl=10ms
The lines above this are one configuration.
> C: #Ifs= 1 Cfg#= 2 Atr=80 MxPwr=500mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00
> Driver=(none)
> E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms
> E: Ad=01(O) Atr=03(Int.) MxPS= 8 Ivl=10ms
And this is a second configuration.
> Here is my question, please, please help me. I know
> that Cls=03( HID ) means it is using a human
> interface device driver, it is at /dev/usb/hiddev0.
Yep.
> When I open it and try to write to it and read from
> it, it hangs i.e it waits forever for a read. (Note: I
> am trying to write my own program to send and receive
> commands to this device.) Does the 2nd "D" line
> Cls=ff(vend.) mean I need a vendor specific driver
> along with the hid driver?? If not then shouldn't a
> simple fd = open("/dev/usb/hiddev0") ... work. Maybe
> a simple explination on how hid driver works. Please
> help.
There are two interfaces to the HID parser. There is a small file in the
kernel distribution (in Documentation/usb/hiddev.txt) that has a little ASCII
art drawing that I did that tries to explain it.
The use of the hiddev interface is badly underdocumented - like much of the
kernel API. I keep meaning to go back and do it, but never got that enthused.
http://www.frogmouth.net/hid-doco/examples/hiddev-misc/dump-events.c
and
http://www.frogmouth.net/hid-doco/examples/hiddev-misc/write-events.c
might help.
Also, Arnauld Quette (from MGE) has written a libHID, which doesn't use the
in-kernel HID code, but instead bypasses it. That might be worth a look too -
see http://www.mgeups.com/opensource/projects/newhidups/
HTH
Brad
- --
http://linux.conf.au - I'm registered. Are you?
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