| From | Kamal Mostafa <> | Subject | [PATCH 001/133] Input: elantech - fix for newer hardware versions (v7) | Date | Fri, 16 Aug 2013 15:32:23 -0700 |
| |
3.8.13.7 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Matteo Delfino <kendatsuba@gmail.com>
commit 9eebed7de660c0b5ab129a9de4f89d20b60de68c upstream.
* 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 <gio.frigione@gmail.com> Signed-off-by: Matteo Delfino <kendatsuba@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Joseph Salisbury <joseph.salisbury@canonical.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- 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 1e8e42f..57b2637 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -694,18 +694,18 @@ 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; } @@ -1282,6 +1282,7 @@ static int elantech_set_properties(struct elantech_data *etd) etd->hw_version = 3; break; case 6: + case 7: etd->hw_version = 4; break; default: -- 1.8.1.2
|