linux-kernel - Re: [PATCH] HID: hid-lg: Add USBID for Logitech G29 Wheel

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Date:	Wed, 2 Sep 2015 22:02:11 -0400
From:	simon@...gewell.org
To:	"Simon Wood" <simon@...gewell.org>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Jiri Kosina" <jkosina@...e.cz>, "Simon Wood" <simon@...gewell.org>
Subject: Re: [PATCH] HID: hid-lg: Add USBID for Logitech G29 Wheel

> I do not have this wheel to test with, but this should at least get it
> working in emulation mode.
>
> Note: There is probably more work required for adjust HID descriptor and
> handle switching between emulation and native modes.

I was able to get some more information, but as yet have not been able to
get time on the real hardware. Attached is a 2nd patch which should
improve the support, I'll formally submit it next week.... But if anyone
can test it first that would be great.

There's a pre-built Debian/Ubuntu kernel here:
https://dl.dropboxusercontent.com/u/34518077/linux-headers-4.2.0-g29%2B_20150831_i386.deb
https://dl.dropboxusercontent.com/u/34518077/linux-image-4.2.0-g29%2B_20150831_i386.deb

The wheel will need to be in PS3 mode set with switch behind LEDs, and
should connect first as a DF-EX (220' turn) and then automatically
reconnect as G29 (900' turn).

The mode should be selectable something like
--
root@...robox:/home/simon# cd /sys/bus/hid/devices/0003\:046D\:C29B.0002
root@...robox:/sys/bus/hid/devices/0003:046D:C29B.0002# ls
alternate_modes  country  driver  hidraw  input  leds  modalias  power 
range  real_id  report_descriptor  subsystem  uevent
root@...robox:/sys/bus/hid/devices/0003:046D:C29B.0002# cat alternate_modes
native: G27 Racing Wheel *
DF-EX: Driving Force / Formula EX
DFP: Driving Force Pro
G25: G25 Racing Wheel
G27: G27 Racing Wheel *
root@...robox:/sys/bus/hid/devices/0003:046D:C29B.0002# echo G25 >
alternate_modes
--

The LEDs should also work
--
root@...robox:/home/simon/linux-git# cd /sys/class/leds/
root@...robox:/sys/class/leds# ls
0003:046D:C29B.0005::RPM1  0003:046D:C29B.0005::RPM4  input3::numlock    
tpacpi::power       tpacpi::thinkvantage
0003:046D:C29B.0005::RPM2  0003:046D:C29B.0005::RPM5  input3::scrolllock 
tpacpi::standby
0003:046D:C29B.0005::RPM3  input3::capslock           phy0-led           
tpacpi::thinklight
root@...robox:/sys/class/leds# echo 1 >
0003\:046D\:C29B.0005\:\:RPM1/brightness
--

Cheers,
Simon
View attachment "g29_ps3.patch" of type "text/x-patch" (6764 bytes)