On Sat, Jul 06, 2013 at 09:27:34AM +0200, Matteo Delfino wrote:
> * Fix version recognition in elantech_set_properties
>
> The new hardware reports itself as v7 but the packets'
> structure is unaltered.
>
> * Fix packet type recognition in elantech_packet_check_v4
>
> The bitmask used for v6 is too wide, only the last three bits of
> the third byte in a packet (packet[3] & 0x03) are actually used to
> distinguish between packet types.
> Starting from v7, additional information (to be interpreted) is
> stored in the remaining bits (packets[3] & 0x1c).
> In addition, the value stored in (packet[0] & 0x0c) is no longer
> a constant but contains additional information yet to be deciphered.
> This change should be backwards compatible with v6 hardware.
>
> Additional-author: Giovanni Frigione <[email protected]>
> Signed-off-by: Matteo Delfino <[email protected]>
Applied, thank you.
> ---
> drivers/input/mouse/elantech.c | 17 +++++++++--------
> 1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> index e2a9867..1c792c9 100644
> --- a/drivers/input/mouse/elantech.c
> +++ b/drivers/input/mouse/elantech.c
> @@ -677,18 +677,18 @@ static int elantech_packet_check_v3(struct psmouse
> *psmouse)
> static int elantech_packet_check_v4(struct psmouse *psmouse)
> {
> unsigned char *packet = psmouse->packet;
> + unsigned char packet_type = packet[3] & 0x03;
>
> - if ((packet[0] & 0x0c) == 0x04 &&
> - (packet[3] & 0x1f) == 0x11)
> + switch (packet_type) {
> + case 0:
> + return PACKET_V4_STATUS;
> +
> + case 1:
> return PACKET_V4_HEAD;
>
> - if ((packet[0] & 0x0c) == 0x04 &&
> - (packet[3] & 0x1f) == 0x12)
> + case 2:
> return PACKET_V4_MOTION;
> -
> - if ((packet[0] & 0x0c) == 0x04 &&
> - (packet[3] & 0x1f) == 0x10)
> - return PACKET_V4_STATUS;
> + }
>
> return PACKET_UNKNOWN;
> }
> @@ -1226,6 +1226,7 @@ static int elantech_set_properties(struct elantech_data
> *etd)
> etd->hw_version = 3;
> break;
> case 6:
> + case 7:
> etd->hw_version = 4;
> break;
> default:
> --
> 1.7.10.4
--
Dmitry
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