linux-kernel - Re: [11/51] Input: atmel_mxt_ts - Implement CRC check for configuration data

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Message-ID: <5239DBDE.7010709@parkeon.com>
Date:	Wed, 18 Sep 2013 18:59:10 +0200
From:	Martin Fuzzey <mfuzzey@...keon.com>
To:	Nick Dyer <nick.dyer@...ev.co.uk>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [11/51] Input: atmel_mxt_ts - Implement CRC check for configuration
 data

On 27/06/13 14:48, Nick Dyer wrote:
> The configuration is stored in NVRAM on the maXTouch chip. When the device is
> reset it reports a CRC of the stored configuration values. Therefore it isn't
> necessary to send the configuration on each probe - we can check the CRC
> matches and avoid a timeconsuming backup/reset cycle.
>
> Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
> Acked-by: Benson Leung <bleung@...omium.org>
> -static unsigned mxt_extract_T6_csum(const u8 *csum)
> +static u16 mxt_extract_T6_csum(const u8 *csum)
>   {
>   	return csum[0] | (csum[1] << 8) | (csum[2] << 16);
>   }

Shouldn't this be u32?
It's losing data causing the checksums not to match for me.

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