Input: add driver for Elan I2C/SMbus touchpad

This driver supports Elan I2C/SMbus touchpads found in some laptops and
also in many Chromebooks.

Signed-off-by: Duson Lin <dusonlin@emc.com.tw>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/elan_i2c.txt b/Documentation/devicetree/bindings/input/elan_i2c.txt
new file mode 100644
index 000000000000..ee3242c4ba67
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/elan_i2c.txt
@@ -0,0 +1,34 @@
+Elantech I2C Touchpad
+
+Required properties:
+- compatible: must be "elan,ekth3000".
+- reg: I2C address of the chip.
+- interrupt-parent: a phandle for the interrupt controller (see interrupt
+  binding[0]).
+- interrupts: interrupt to which the chip is connected (see interrupt
+  binding[0]).
+
+Optional properties:
+- wakeup-source: touchpad can be used as a wakeup source.
+- pinctrl-names: should be "default" (see pinctrl binding [1]).
+- pinctrl-0: a phandle pointing to the pin settings for the device (see
+  pinctrl binding [1]).
+- vcc-supply: a phandle for the regulator supplying 3.3V power.
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+Example:
+        &i2c1 {
+                /* ... */
+
+                touchpad@15 {
+                        compatible = "elan,ekth3000";
+                        reg = <0x15>;
+                        interrupt-parent = <&gpio4>;
+                        interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+                        wakeup-source;
+                };
+
+                /* ... */
+        };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index ac7269f90764..e6469ec7a90e 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -42,6 +42,7 @@ dlink	D-Link Corporation
 dmo     Data Modul AG
 ebv     EBV Elektronik
 edt     Emerging Display Technologies
+elan    Elan Microelectronic Corp.
 emmicro EM Microelectronic
 epcos   EPCOS AG
 epfl    Ecole Polytechnique Fédérale de Lausanne