linux-kernel - Re: [PATCH v2] Input: ALPS - Fix ALPS touchpad detection

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Message-ID: <4F465007.30304@gmail.com>
Date:	Thu, 23 Feb 2012 23:41:11 +0900
From:	Akio Idehara <zbe64533@...il.com>
To:	dmitry.torokhov@...il.com, dtor@...l.ru
CC:	seth.forshee@...onical.com, rubini@...l.unipv.it,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, rdunlap@...otime.net,
	gregkh@...uxfoundation.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH v2] Input: ALPS - Fix ALPS touchpad detection

This is definitely a bug which isn't fixed for nine years.
Why this patch isn't applied to the input sub-system (or mainline)?

Seth Forshee wrote:
> On Thu, Feb 16, 2012 at 10:11:55PM +0900, Akio Idehara wrote:
>> 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@...r.kernel.org>
>> Signed-off-by: Akio Idehara<zbe64533@...il.com>
>
> This version is working fine for me. Thanks!
>
> Tested-by: Seth Forshee<seth.forshee@...onical.com>

  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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@...r.kernel.org>
Signed-off-by: Akio Idehara <zbe64533@...il.com>
Tested-by: Seth Forshee<seth.forshee@...onical.com>
---
     Documentation/input/alps.txt |    3 ++-
     drivers/input/mouse/alps.c   |    7 +++++--
     2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index f274c28..2f95308 100644
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -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
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index bd87380..4c6a72d 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -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;

     	/*
-- 1.7.9
--
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