Re: [PATCH v2 7/7] Input: elantech - add v3 hardware support

[Seth Forshee <seth.forshee@canonical.com>]

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