Re: [RFC v2 0/1] User-space HID I/O Driver

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On Tue, Apr 3, 2012 at 7:14 PM, Jiri Kosina <jkosina@xxxxxxx> wrote:
> On Tue, 3 Apr 2012, Joao Paulo Rechi Vita wrote:
>
>> >> This is the second revision of the UHID driver. It basically allows to register
>> >> hid_ll_drivers in user-space. This is needed to implement Bluetooth HoG (HID
>> >> over GATT) as discussed earlier.
>> >>
>> >
>> > We have a first prototype implementation of the HoG plugin working
>> > with the uhid driver \o/
>> >
>>
>> I'm having problems with modifiers keys (they don't work). The USB-HID
>> spec says that for each modifier key pressed a bit have to be set on
>> the modifiers byte (byte 2) of the report array. Dumping the data both
>> on the HoG plugin on bluetoothd and through hidraw for the created HID
>> device shows that these bits are being set correctly.
>>
>> Any idea of what could be wrong or additional checks that can be performed?
>
> So hidraw shows the respective bits set properly, but they are not coming
> out of /dev/input/eventX, right?
>

Exactly.

> How about /syse/kernel/debug/hid/<device>/events, does it show the events?
>

Thanks for the help, but it wasn't needed. The problem was actually on
the userspace HoG->HID parsing, we're adding an additional 0x00 byte
to the beginning of the array. Now modifiers works!

-- 
João Paulo Rechi Vita
Openbossa Labs - INdT
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