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Input: ALPS - fix touchpad detection when buttons are pressed

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ALPS touchpad detection fails if some buttons of ALPS are pressed.
The reason is that the "E6" query response byte is different from
what is expected.

This was tested on a Toshiba Portege R500.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Akio Idehara <zbe64533@gmail.com>
Tested-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Akio Idehara 2012-02-24 00:33:22 -08:00 committed by Dmitry Torokhov
parent 82b982c9a6
commit 99c90ab31f
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/input/alps.txt
View File

@ -13,7 +13,8 @@ Detection
All ALPS touchpads should respond to the "E6 report" command sequence:
E8-E6-E6-E6-E9. An ALPS touchpad should respond with either 00-00-0A or
00-00-64.
00-00-64 if no buttons are pressed. The bits 0-2 of the first byte will be 1s
if some buttons are pressed.
If the E6 report is successful, the touchpad model is identified using the "E7
report" sequence: E8-E7-E7-E7-E9. The response is the model signature and is

7
drivers/input/mouse/alps.c
View File

@ -952,7 +952,9 @@ static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int
/*
* First try "E6 report".
* ALPS should return 0,0,10 or 0,0,100
* ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
* The bits 0-2 of the first byte will be 1s if some buttons are
* pressed.
*/
param[0] = 0;
if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
@ -968,7 +970,8 @@ static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int
psmouse_dbg(psmouse, "E6 report: %2.2x %2.2x %2.2x",
param[0], param[1], param[2]);
if (param[0] != 0 || param[1] != 0 || (param[2] != 10 && param[2] != 100))
if ((param[0] & 0xf8) != 0 || param[1] != 0 ||
(param[2] != 10 && param[2] != 100))
return NULL;
/*