linux-kernel - Re: [PATCH v2 7/7] Input: elantech

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Message-ID: <20110824143520.GB23868@thinkpad-t410>
Date:	Wed, 24 Aug 2011 09:35:20 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	JJ Ding <jj_ding@....com.tw>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Aaron Huang <aaron_huang@....com.tw>,
	Tom Lin <tom_lin@....com.tw>,
	Éric Piel <E.A.B.Piel@...elft.nl>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Chase Douglas <chase.douglas@...onical.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Alessandro Rubini <rubini@...l.unipv.it>
Subject: Re: [PATCH v2 7/7] Input: elantech - add v3 hardware support

On Wed, Aug 24, 2011 at 01:44:46PM +0800, JJ Ding wrote:
> @@ -403,11 +503,39 @@ static int elantech_packet_check_v2(struct psmouse *psmouse)
>  }
>  
>  /*
> + * We check the constant bits to determine what packet type we get,
> + * so packet checking is mandatory for v3 hardware.
> + */
> +static int elantech_packet_check_v3(struct psmouse *psmouse)
> +{
> +	unsigned char *packet = psmouse->packet;
> +
> +	if ((packet[0] & 0x0c) == 0x04 &&
> +	    (packet[3] & 0xcf) == 0x02)
> +		return PACKET_V3_HEAD;
> +
> +	if ((packet[0] & 0x0c) == 0x0c &&
> +	    (packet[3] & 0xce) == 0x0c)
> +		return PACKET_V3_TAIL;
> +
> +	if (packet[0] == 0xc4 &&
> +	    packet[1] == 0xff &&
> +	    packet[2] == 0xff &&
> +	    packet[3] == 0x02 &&
> +	    packet[4] == 0xff &&
> +	    packet[5] == 0xff)
> +		return PACKET_DEBOUNCE;
> +
> +	return PACKET_UNKNOWN;
> +}

This will never return PACKET_DEBOUNCE, because those packets will have
already matched the conditions for PACKET_V3_HEAD. That condition needs
to be moved to the top of the function.

Seth
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