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

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On Thu, Apr 26, 2012 at 2:54 PM, David Herrmann
<dh.herrmann@xxxxxxxxxxxxxx> wrote:
> Hi Claudio
>
> On Thu, Apr 26, 2012 at 7:22 PM, Claudio Takahasi
> <claudio.takahasi@xxxxxxxxxxxxx> wrote:
>> Hi David/Jiri,
> [snip]
>>
>> The basic features are now working, we have tested HoG keyboard and
>> mouse. The major features missing related to HID are output/feature
>> reports, and suspend.
>
> Output reports should be working. Only thing missing is feature input
> reports. They are not implemented yet. However, what driver (except
> hidraw and picolcd) uses them?
>
>> My HID knowledge is quite limited but it seems that output reports are
>> not working on uhid, at least I didn't see events from the host. Even
>> for USB keyboard it doesn't work, do you have any pointers?
>
> Do you actually handle the UHID_OUTPUT and UHID_OUTPUT_EV events from
> UHID? I have looked at the HoG code recently and haven't seen any code
> that correctly parses UHID_OUTPUT_EV packets? These packets contain
> LED (capslock, numlock etc.) updates so the keyboard can actually set
> them. They also contain BELL/SOUND codes for such devices. Only other
> non-standard stuff is sent through UHID_OUTPUT reports. If there are
> problems with it, I can help implementing this.
>

We're handling these events, but this code has not been sent to the
mailing list yet. We're going to re-send the same patchset as before,
with comments fixed, and send a RFC for the output reports handling
afterwards.

> Regarding UHID, I will send an updated version this weekend which
> mainly improves the internal buffer handling. The API will stay the
> same, however, I might implement the feature input reports, then
> everything should be ready for merging upstream (if the review cycles
> go well ;)).
>

Good to hear that! We've been using it on a daily basis to work on the
HoG implementation and haven't noticed any major issue.

-- 
João Paulo Rechi Vita
Openbossa Labs - INdT
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