linux-kernel - RE: [PATCH v2 09/10] Input: elan_i2c - correct the width/size base value

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Date:   Fri, 24 May 2019 11:13:10 +0800
From:   廖崇榮 <kt.liao@....com.tw>
To:     "'Benjamin Tissoires'" <benjamin.tissoires@...hat.com>,
        "'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
        "'Rob Herring'" <robh+dt@...nel.org>,
        "'Aaron Ma'" <aaron.ma@...onical.com>,
        "'Hans de Goede'" <hdegoede@...hat.com>
Cc:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: RE: [PATCH v2 09/10] Input: elan_i2c - correct the width/size base value

Hi Benjamin,

Thanks so much for all you do for Elan touchpad.

For the width_*, I have a question for it.
Our antenna sensors fully occupied the whole touchpad PCB.

The Gap between 2 sensors are 7.5 mil (0.19mm).
That's why we did not minus one trace.


Thanks
KT
-----Original Message-----
From: Benjamin Tissoires [mailto:benjamin.tissoires@...hat.com] 
Sent: Tuesday, May 21, 2019 9:27 PM
To: Dmitry Torokhov; KT Liao; Rob Herring; Aaron Ma; Hans de Goede
Cc: linux-input@...r.kernel.org; linux-kernel@...r.kernel.org;
devicetree@...r.kernel.org; Benjamin Tissoires
Subject: [PATCH v2 09/10] Input: elan_i2c - correct the width/size base
value

*_traces are the number of antennas. width_* is thus the space between 2
antennas. Which means, we should subtract 1 to the number of antennas to
divide the touchpad by the number of holes between each antenna.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

--

new in v2
---
 drivers/input/mouse/elan_i2c_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c_core.c
b/drivers/input/mouse/elan_i2c_core.c
index 6f4feedb7765..3375eaa9a72e 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -398,8 +398,8 @@ static int elan_query_device_parameters(struct
elan_tp_data *data)
 		if (error)
 			return error;
 	}
-	data->width_x = data->max_x / x_traces;
-	data->width_y = data->max_y / y_traces;
+	data->width_x = data->max_x / (x_traces - 1);
+	data->width_y = data->max_y / (y_traces - 1);
 
 	if (device_property_read_u32(&client->dev,
 				     "touchscreen-x-mm", &x_mm) ||
--
2.21.0