linux-kernel - [PATCH 3.13 041/163] Input: elantech - fix detection of touchpad on ASUS s301l

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Message-Id: <1412888588-26755-42-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Oct 2014 14:01:06 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Hans de Goede <hdegoede@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 041/163] Input: elantech - fix detection of touchpad on ASUS s301l

3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdegoede@...hat.com>

commit 271329b3c798b2102120f5df829071c211ef00ed upstream.

Adjust Elantech signature validation to account fo rnewer models of
touchpads.

Reported-and-tested-by: Màrius Monton <marius.monton@...il.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/input/mouse/elantech.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 233516a..0b75b57 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -1253,6 +1253,13 @@ static bool elantech_is_signature_valid(const unsigned char *param)
 	if (param[1] == 0)
 		return true;
 
+	/*
+	 * Some models have a revision higher then 20. Meaning param[2] may
+	 * be 10 or 20, skip the rates check for these.
+	 */
+	if (param[0] == 0x46 && (param[1] & 0xef) == 0x0f && param[2] < 40)
+		return true;
+
 	for (i = 0; i < ARRAY_SIZE(rates); i++)
 		if (param[2] == rates[i])
 			return false;
-- 
1.9.1

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