linux-kernel - [PATCH] Input: ALPS - fix max coordinates for v5 and v7 protocols

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Message-ID: <20150322033656.GA35352@dtor-ws>
Date:	Sat, 21 Mar 2015 20:36:56 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	linux-input@...r.kernel.org
Cc:	Hans de Goede <hdegoede@...hat.com>,
	Pali Rohár <pali.rohar@...il.com>,
	Santiago Gala <sgala@...che.org>,
	Yunkang Tang <yunkang.tang@...alps.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Input: ALPS - fix max coordinates for v5 and v7 protocols

Commit 3296f71cd2fde7a2ad52e66a27eae419f6328066 ("Input: ALPS - consolidate
setting protocol parameters") inadvertently moved call to
alps_dolphin_get_device_area() from v5 to v7 protocol, causing both
protocols report incorrect maximum values for X and Y axes which resulted
in crash in Synaptics X driver.

Reported-by: Santiago Gala <sgala@...che.org>
Reported-by: Pali Rohár <pali.rohar@...il.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/mouse/alps.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 1bd15eb..33198b9 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -2281,10 +2281,12 @@ static int alps_set_protocol(struct psmouse *psmouse,
 		priv->set_abs_params = alps_set_abs_params_mt;
 		priv->nibble_commands = alps_v3_nibble_commands;
 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
-		priv->x_max = 1360;
-		priv->y_max = 660;
 		priv->x_bits = 23;
 		priv->y_bits = 12;
+
+		if (alps_dolphin_get_device_area(psmouse, priv))
+			return -EIO;
+
 		break;
 
 	case ALPS_PROTO_V6:
@@ -2303,9 +2305,8 @@ static int alps_set_protocol(struct psmouse *psmouse,
 		priv->set_abs_params = alps_set_abs_params_mt;
 		priv->nibble_commands = alps_v3_nibble_commands;
 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
-
-		if (alps_dolphin_get_device_area(psmouse, priv))
-			return -EIO;
+		priv->x_max = 0xfff;
+		priv->y_max = 0x7ff;
 
 		if (priv->fw_ver[1] != 0xba)
 			priv->flags |= ALPS_BUTTONPAD;
-- 
2.2.0.rc0.207.ga3a616c


-- 
Dmitry
--
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