linux-kernel - Re: [PATCH] hid: Fix Logitech Driving Force Pro wheel

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Date:	Sun, 29 May 2011 10:50:35 -0400
From:	simon@...gewell.org
To:	"Michael Bauer" <michael@...auer.org>
Cc:	linux-input@...r.kernel.org, simon@...gewell.org,
	linux-kernel@...r.kernel.org, "Jiri Kosina" <jkosina@...e.cz>
Subject: Re: [PATCH] hid: Fix Logitech Driving Force Pro wheel


> Often the control assignement works like this: User clicks "set axis for
> acceleration", application asks "please move the desired axis" and then
> automatically choses the "moving" axis.
> If we report both combined and separate at the same time, the application
> will
> have a hard time deciding which one to use, as they both will change their
> values.
>

Fair enough, I played a little trying to massage the original descriptor
but could not find a sensible solution - so I guess we'll have to provide
a full replacement.

I don't see the need to comment the original/replacement blocks, so
probably a simple 'hex block' would be good.

Regarding the replacement, you appear to have a lot of unnecessary code
there. You could try with something like:
--
...
+0x09, 0x39,         /*          Usage (Hat Switch),             */
+0x81, 0x42,         /*          Input (Variable),               */
+0x75, 0x08,         /*          Report Size (8),                */
+0x95, 0x08,         /*          Report Count (1),               */
+0x65, 0x00,         /*          Unit,                           */
+0x06, 0x00, 0xFF,   /*          Usage Page (FF00h),             */
+0x26, 0xFF, 0x00,   /*          Logical Maximum (255),          */
+0x46, 0xFF, 0x00,   /*          Physical Maximum (255),         */
+0x09, 0x01,         /*          Usage (01h),                    */
+0x81, 0x02,         /*          Input (Variable),               */
+0xA4,               /*          Push,                           */
+0x05, 0x01,         /*          Usage Page (Desktop),           */
+0x95, 0x01,         /*          Report Count (2),               */
+0x09, 0x31,         /*          Usage (Y),                      */
+0x09, 0x35,         /*          Usage (Rz),                     */
+0x81, 0x02,         /*          Input (Variable),               */
+0xB4,               /*          Pop,                            */
+0x81, 0x02,         /*          Input (Variable),               */
+0xC0,               /*      End Collection,                     */
...
--

Cheers,
Simon.

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