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Input: alps - only Dell laptops have separate button bits for v2 dualpoint sticks

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It turns out that only Dell laptops have the separate button bits for
v2 dualpoint sticks and that commit 92bac83dd7 ("Input: alps - non
interleaved V2 dualpoint has separate stick button bits") causes
regressions on Toshiba laptops.

This commit adds a check for Dell laptops to the code for handling these
extra button bits, fixing this regression.

This patch has been tested on a Dell Latitude D620 to make sure that it
does not reintroduce the original problem.

Reported-and-tested-by: Douglas Christman <douglaschristman@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede 2015-08-03 14:06:24 -07:00 committed by Dmitry Torokhov
parent b6e26546cc
commit 073e570d7c
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/input/alps.txt
View File

@ -119,8 +119,10 @@ ALPS Absolute Mode - Protocol Version 2
byte 5: 0 z6 z5 z4 z3 z2 z1 z0
Protocol Version 2 DualPoint devices send standard PS/2 mouse packets for
the DualPoint Stick. For non interleaved dualpoint devices the pointingstick
buttons get reported separately in the PSM, PSR and PSL bits.
the DualPoint Stick. The M, R and L bits signal the combined status of both
the pointingstick and touchpad buttons, except for Dell dualpoint devices
where the pointingstick buttons get reported separately in the PSM, PSR
and PSL bits.
Dualpoint device -- interleaved packet format
---------------------------------------------

8
drivers/input/mouse/alps.c
View File

@ -20,6 +20,7 @@
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include <linux/dmi.h>
#include "psmouse.h"
#include "alps.h"
@ -99,6 +100,7 @@ static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
#define ALPS_FOUR_BUTTONS 0x40 /* 4 direction button present */
#define ALPS_PS2_INTERLEAVED 0x80 /* 3-byte PS/2 packet interleaved with
6-byte ALPS packet */
#define ALPS_DELL 0x100 /* device is a Dell laptop */
#define ALPS_BUTTONPAD 0x200 /* device is a clickpad */
static const struct alps_model_info alps_model_data[] = {
@ -251,9 +253,9 @@ static void alps_process_packet_v1_v2(struct psmouse *psmouse)
return;
}
/* Non interleaved V2 dualpoint has separate stick button bits */
/* Dell non interleaved V2 dualpoint has separate stick button bits */
if (priv->proto_version == ALPS_PROTO_V2 &&
priv->flags == (ALPS_PASS | ALPS_DUALPOINT)) {
priv->flags == (ALPS_DELL | ALPS_PASS | ALPS_DUALPOINT)) {
left |= packet[0] & 1;
right |= packet[0] & 2;
middle |= packet[0] & 4;
@ -2550,6 +2552,8 @@ static int alps_set_protocol(struct psmouse *psmouse,
priv->byte0 = protocol->byte0;
priv->mask0 = protocol->mask0;
priv->flags = protocol->flags;
if (dmi_name_in_vendors("Dell"))
priv->flags |= ALPS_DELL;
priv->x_max = 2000;
priv->y_max = 1400;