Re: [PATCH] Input: xpad: Remove a conflicting Razer Sabertooth using the VID/PID for the Razer DeathAdder 2013 mouse

[Cameron Gutman <aicommander@gmail.com>]

On 7/30/20 11:14 PM, Swyter wrote:
> On 31/07/2020 7:54, Cameron Gutman wrote:
>> On 7/30/20 8:44 AM, Ismael Ferreras Morezuelas wrote:
>>> -	{ 0x1532, 0x0037, "Razer Sabertooth", 0, XTYPE_XBOX360 },
>>>
>>
>> The list here doesn't actually affect which devices that xpad will attach to.
>> xpad_table[] is what determines the devices that xpad's probe() will be
>> called for. It does this using the VID + vendor-defined interface subclass
>> and interface number, not the VID+PID combos. xpad_device[] just provides a
>> friendly name and quirk flags for some supported gamepads. Gamepads that
>> aren't in the list will just show up as "Generic X-Box pad" with no quirk
>> flags applied.
>>
>> If 1532:0037 is actually a mouse, it's unlikely we'd even reach the probe()
>> in the first place. The device would lack the expected vendor-defined Xbox
>> interface that is required for xpad to attach to the device.
>>
>> All that said, I'm definitely not opposed to removing the entry if it isn't
>> a real gamepad. Given the difficulty you had finding information about this
>> device, I take it you don't have any 'lsusb -v' output for this device, right?
>>
>> Regards,
>> Cameron
>>
> 
> Hi, Cameron. Yeah, the main idea is to clean the list, even if as you say it hasn't
> caused mouse issues and that's why probably nobody has noticed it before.
> 
> Because, for some reason, everyone assumes some kind of correctness even when most of
> these are community-sourced and self-reported, everyone copies these lists from
> somewhere else. Hopefully the fixes will trickle downstream.
> 
> So yeah, I know for sure that (for example) the internal list Valve uses comes right from here:
> https://hg.libsdl.org/SDL/file/7d94464f10f7/src/joystick/controller_type.h#l246
> 
> (It's commented out)
> 
> Actual change referencing this kernel issue:
> https://hg.libsdl.org/SDL/rev/29809f6f0271
> 
> For more information of the device, take a look here:
> https://github.com/xboxdrv/xboxdrv/pull/59
> 
> You can see a lsusb dump here: https://github.com/xboxdrv/xboxdrv/files/76581/Qa6dBcrv.txt
> 
> So yeah, let me know what you guys think. This has been a weird tangent for me. :)
> 

Yep, that device definitely isn't an Xbox controller. That's for sure.

We wouldn't reach xpad_probe(), but it's a good idea to get rid of it anyway
to ensure that other projects using the our list won't be misled like SDL was.

On the off chance Razer did release an Xbox gamepad with that VID/PID, we'll
still enumerate it properly in xpad using the generic controller codepath.

So this patch looks good to me.

Reviewed-by: Cameron Gutman <aicommander@gmail.com>


Regards,
Cameron