linux-kernel - Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

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Message-ID: <460AE933.6010209@gmail.com>
Date:	Thu, 29 Mar 2007 00:16:19 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Dmitry Torokhov <dtor@...ightbb.com>
CC:	johann deneux <johann.deneux@...il.com>,
	"STenyaK (Bruno González)" 
	<stenyak@...il.com>, Anssi Hannula <anssi.hannula@...il.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	linux-input@...ey.karlin.mff.cuni.cz
Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom
 driver]

Dmitry Torokhov napsal(a):
> On Tuesday 27 March 2007 17:34, johann deneux wrote:
>> What about adding a member to ff_effect which would be the number of the motor?
>> We can't change the layout of ff_effect too much though, so we have to
>> find unused bits and put them to work.
>>
>> For instance, we could replace
>>
>> __u16 type;
>>
>> by
>>
>> __u8 motor;
>> __u8 type;
>>
> 
> Splitting type field seems to be a good idea.

Maybe stupid question, but what about endianness + backward compatibility?
If we split it into motor,type sequence, it would break LE (untouched BE),
if we do type,motor, it is OK for LE (broken BE).

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
 B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E

Hnus <hnus@...muni.cz> is an alias for /dev/null
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