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authorAhmet Inan <inan@distec.de>2017-10-14 20:10:53 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-10-26 00:55:33 +0300
commit7e577a17f2eefeef32f1106ebf91e7cd143ba654 (patch)
tree34147b970b0d1eb17f95331d13f6b339aa911a46 /Documentation/devicetree/bindings/input
parent25309004c0e761986c9dc23526a03928a85188c0 (diff)
downloadlinux-7e577a17f2eefeef32f1106ebf91e7cd143ba654.tar.xz
Input: add I2C attached EETI EXC3000 multi touch driver
The 3000 series have a new protocol which allows to report up to 5 points in a single 66 byte frame. One must always read in 66 byte frames. To support up to 10 points, two consecutive frames need to be read: The first frame says how many points until sync. The second frame must say zero points or both frames must be discarded. To be able to work with the higher 400KHz I2C bus rate, one must successfully send a special package prior _each_ read or the controller will refuse to cooperate. This is a minimal implementation based on egalax_i2c.c (which can be found on the internet) and egalax_ts.c but without the vendor interface and no power management support. Signed-off-by: Ahmet Inan <inan@distec.de> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/devicetree/bindings/input')
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/exc3000.txt27
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diff --git a/Documentation/devicetree/bindings/input/touchscreen/exc3000.txt b/Documentation/devicetree/bindings/input/touchscreen/exc3000.txt
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+* EETI EXC3000 Multiple Touch Controller
+
+Required properties:
+- compatible: must be "eeti,exc3000"
+- reg: i2c slave address
+- interrupt-parent: the phandle for the interrupt controller
+- interrupts: touch controller interrupt
+- touchscreen-size-x: See touchscreen.txt
+- touchscreen-size-y: See touchscreen.txt
+
+Optional properties:
+- touchscreen-inverted-x: See touchscreen.txt
+- touchscreen-inverted-y: See touchscreen.txt
+- touchscreen-swapped-x-y: See touchscreen.txt
+
+Example:
+
+ touchscreen@2a {
+ compatible = "eeti,exc3000";
+ reg = <0x2a>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+ touchscreen-size-x = <4096>;
+ touchscreen-size-y = <4096>;
+ touchscreen-inverted-x;
+ touchscreen-swapped-x-y;
+ };