linux-kernel - [PATCH] Input: elan_i2c - Recovery exception ic type

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Date:	Mon, 31 Aug 2015 09:49:36 +0800
From:	duson <dusonlin@....com.tw>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Input: elan_i2c - Recovery exception ic type

When driver get exception ic type (0xFF), maybe occurred from wrong
I2C protocol communication, system crash or other unknown situation,
we need to reset ic type from iap_version.
---
 drivers/input/mouse/elan_i2c_core.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 5b5f403..39d9929 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -4,7 +4,7 @@
  * Copyright (c) 2013 ELAN Microelectronics Corp.
  *
  * Author: 林政維 (Duson Lin) <dusonlin@....com.tw>
- * Version: 1.5.9
+ * Version: 1.6.0
  *
  * Based on cyapa driver:
  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
@@ -40,7 +40,7 @@
 #include "elan_i2c.h"
 
 #define DRIVER_NAME		"elan_i2c"
-#define ELAN_DRIVER_VERSION	"1.5.9"
+#define ELAN_DRIVER_VERSION	"1.6.0"
 #define ETP_MAX_PRESSURE	255
 #define ETP_FWIDTH_REDUCE	90
 #define ETP_FINGER_WIDTH	15
@@ -247,15 +247,19 @@ static int elan_query_device_info(struct elan_tp_data *data)
 	if (error)
 		return error;
 
-	error = data->ops->get_sm_version(data->client, &data->ic_type,
-					  &data->sm_version);
+	error = data->ops->get_version(data->client, true, &data->iap_version);
 	if (error)
 		return error;
 
-	error = data->ops->get_version(data->client, true, &data->iap_version);
+	error = data->ops->get_sm_version(data->client, &data->ic_type,
+					  &data->sm_version);
 	if (error)
 		return error;
 
+	/* exception type, need reset from iap_version */
+	if (data->ic_type == 0xFF)
+		data->ic_type = data->iap_version;
+
 	error = data->ops->get_pressure_adjustment(data->client,
 						   &data->pressure_adjustment);
 	if (error)


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