linux-kernel - Re: HID: is scancode correctly reported after key status change in hidinput_hid

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Date:	Sat, 9 Jan 2010 19:51:21 +0100
From:	roel kluin <roel.kluin@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: HID: is scancode correctly reported after key status change in 
	hidinput_hid_event()?

On Sat, Jan 9, 2010 at 4:15 PM, Jiri Kosina <jkosina@...e.cz> wrote:
> On Sat, 9 Jan 2010, Roel Kluin wrote:
>
>> vi drivers/hid/hid-input.c +634 and not in hidinput_hid_event()
>>
>>       /* report the usage code as scancode if the key status has changed */
>>       if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value)
>>               input_event(input, EV_MSC, MSC_SCAN, usage->hid);
>>
>> Only if value is 1 or 0 the input_event() can occur, but value doesn't
>> seem to be intended to be used as a boolean. are we really doing the
>> correct test here?
>
> Hi Roel,
>
> well, value 2 means 'repeated' key, and there is no other possibility for
> EV_KEY value than 0,1,2.
>
> For EV_KEY events generated by HID devices, the autorepeat is done by
> input core (as the device sends the report only when status is changed),
> so there is no easy way how to inject EV_MSC into the 'autorepeat reports'
> anyway.
>
> Are you hitting some bug because of this, or have you found this out
> solely by code reading?

only code reading.

Thanks
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