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

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Date:	Thu, 25 Aug 2011 09:09:02 +0800
From:	JJ Ding <jj_ding@....com.tw>
To:	Seth Forshee <seth.forshee@...onical.com>
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

Hi Seth,

Thank you. You are right.
I think I somehow tested the worng touchpad for this patch.

jj

On Wed, 24 Aug 2011 09:35:20 -0500, Seth Forshee <seth.forshee@...onical.com> wrote:
> 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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