linux-kernel - Re: NULL pointer dereference in i2c-hid

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Message-ID: <54AF19BE.9010506@synaptics.com>
Date:	Thu, 8 Jan 2015 15:58:54 -0800
From:	Andrew Duggan <aduggan@...aptics.com>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>
CC:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<benjamin.tissoires@...hat.com>, <jkosina@...e.cz>
Subject: Re: NULL pointer dereference in i2c-hid

On 12/24/2014 03:53 PM, Gabriele Mazzotta wrote:
[...snip...]
>>>> Also, if you can get the firmware id from your touchpad that would also
>>>> be useful.
>>>>
>>>> $ sudo ./rmihidtool -f /dev/hidraw0
>>> firmware id: 1522295
>> Thanks, I will see if I can get any additional information on this.
>>
>> Andrew
> Hi,
>
> I think I found the source of the problem.
>
> $ ./rmihidtool /dev/hidraw1 -r 0x50 1
> 0x01  #PalmDetect Interrupt Enable, right?
Yes, 0x50 does appear to be the address of the palm detect interrupt 
enable register.
> $ ./rmihidtool /dev/hidraw1 -w 0x50 0  #Disable PalmDetect Interrupt
>
> It makes more sense now that widths greater than 12 trigger the bug.
That is weird behavior and I haven't seen anything like that before. I 
will file a bug to see if firmware has any idea why this is happening.
>
> Gabriele
>
Andrew
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