linux-kernel - [PATCH] input: edt-ft5x06: increase allowed data range for threshold parameter

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Date:   Tue, 2 May 2017 17:00:59 +0200
From:   Martin Kepplinger <martin.kepplinger@...zinger.com>
To:     <dmitry.torokhov@...il.com>, <simon.budig@...nelconcepts.de>,
        <daniel.wagener@...nelconcepts.de>, <mchehab@...nel.org>
CC:     <linux-input@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        Martin Kepplinger <martin.kepplinger@...zinger.com>,
        Schoefegger Stefan <stefan.schoefegger@...zinger.com>,
        Manfred Schlaegl <manfred.schlaegl@...zinger.com>
Subject: [PATCH] input: edt-ft5x06: increase allowed data range for threshold parameter

The datasheet and application note does not mention an allowed range for
the M09_REGISTER_THRESHOLD parameter. One of our customers needs to set
lower values than 20 and they seem to work just fine on EDT EP0xx0M09 with
T5x06 touch.

So, lacking a known lower limit, we increase the range for thresholds,
and set the lower limit to 0. The documentation is updated accordingly.

Signed-off-by: Schoefegger Stefan <stefan.schoefegger@...zinger.com>
Signed-off-by: Manfred Schlaegl <manfred.schlaegl@...zinger.com>
Signed-off-by: Martin Kepplinger <martin.kepplinger@...zinger.com>
---
 Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt | 2 +-
 Documentation/input/devices/edt-ft5x06.rst                         | 2 +-
 drivers/input/touchscreen/edt-ft5x06.c                             | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
index 6db2210..025cf8c 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
@@ -36,7 +36,7 @@ Optional properties:
                 control gpios
 
  - threshold:   allows setting the "click"-threshold in the range
-                from 20 to 80.
+                from 0 to 80.
 
  - gain:        allows setting the sensitivity in the range from 0 to
                 31. Note that lower values indicate higher
diff --git a/Documentation/input/devices/edt-ft5x06.rst b/Documentation/input/devices/edt-ft5x06.rst
index 2032f0b..1ccc94b 100644
--- a/Documentation/input/devices/edt-ft5x06.rst
+++ b/Documentation/input/devices/edt-ft5x06.rst
@@ -15,7 +15,7 @@ It has been tested with the following devices:
 The driver allows configuration of the touch screen via a set of sysfs files:
 
 /sys/class/input/eventX/device/device/threshold:
-    allows setting the "click"-threshold in the range from 20 to 80.
+    allows setting the "click"-threshold in the range from 0 to 80.
 
 /sys/class/input/eventX/device/device/gain:
     allows setting the sensitivity in the range from 0 to 31. Note that
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 8cf8d8d..f872817 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -471,7 +471,7 @@ static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
 		M09_REGISTER_OFFSET, 0, 31);
 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
-		M09_REGISTER_THRESHOLD, 20, 80);
+		M09_REGISTER_THRESHOLD, 0, 80);
 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
 		NO_REGISTER, 3, 14);
 
-- 
2.1.4