Commit cbebf5ad authored by Marco Felsch's avatar Marco Felsch Committed by Dmitry Torokhov

Input: qt1050 - add Microchip AT42QT1050 support

Add initial support for the AT42QT1050 (QT1050) device. The device
supports up to five input keys, dependent on the mode. Since it adds only
the initial support, the "1 to 4 keys plus Guard Channel" mode isn't
supported.
Signed-off-by: default avatarMarco Felsch <m.felsch@pengutronix.de>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 7b5bb55d
Microchip AT42QT1050 Five-channel Touch Sensor IC
The AT42QT1050 (QT1050) is a QTouchADC sensor device. The device can sense from
one to five keys, dependent on mode. The QT1050 includes all signal processing
functions necessary to provide stable sensing under a wide variety of changing
conditions, and the outputs are fully debounced.
The touchkey device node should be placed inside an I2C bus node.
Required properties:
- compatible: Must be "microchip,qt1050"
- reg: The I2C address of the device
- interrupts: The sink for the touchpad's IRQ output,
see ../interrupt-controller/interrupts.txt
Optional properties:
- wakeup-source: touch keys can be used as a wakeup source
Each button (key) is represented as a sub-node:
Each not specified key or key with linux,code set to KEY_RESERVED gets disabled
in HW.
Subnode properties:
- linux,code: Keycode to emit.
- reg: The key number. Valid values: 0, 1, 2, 3, 4.
Optional subnode-properties:
If a optional property is missing or has a invalid value the default value is
taken.
- microchip,pre-charge-time-ns:
Each touchpad need some time to precharge. The value depends on the mechanical
layout.
Valid value range: 0 - 637500; values must be a multiple of 2500;
default is 0.
- microchip,average-samples:
Number of data samples which are averaged for each read.
Valid values: 1, 4, 16, 64, 256, 1024, 4096, 16384; default is 1.
- microchip,average-scaling:
The scaling factor which is used to scale the average-samples.
Valid values: 1, 2, 4, 8, 16, 32, 64, 128; default is 1.
- microchip,threshold:
Number of counts to register a touch detection.
Valid value range: 0 - 255; default is 20.
Example:
QT1050 with 3 non continuous keys, key2 and key4 are disabled.
touchkeys@41 {
compatible = "microchip,qt1050";
reg = <0x41>;
interrupt-parent = <&gpio0>;
interrupts = <17 IRQ_TYPE_EDGE_FALLING>;
up@0 {
reg = <0>;
linux,code = <KEY_UP>;
microchip,average-samples = <64>;
microchip,average-scaling = <16>;
microchip,pre-charge-time-ns = <10000>;
};
right@1 {
reg = <1>;
linux,code = <KEY_RIGHT>;
microchip,average-samples = <64>;
microchip,average-scaling = <8>;
};
down@3 {
reg = <3>;
linux,code = <KEY_DOWN>;
microchip,average-samples = <256>;
microchip,average-scaling = <16>;
};
};
...@@ -137,6 +137,17 @@ config KEYBOARD_ATKBD_RDI_KEYCODES ...@@ -137,6 +137,17 @@ config KEYBOARD_ATKBD_RDI_KEYCODES
right-hand column will be interpreted as the key shown in the right-hand column will be interpreted as the key shown in the
left-hand column. left-hand column.
config KEYBOARD_QT1050
tristate "Microchip AT42QT1050 Touch Sensor Chip"
depends on I2C
select REGMAP_I2C
help
Say Y here if you want to use Microchip AT42QT1050 QTouch
Sensor chip as input device.
To compile this driver as a module, choose M here:
the module will be called qt1050
config KEYBOARD_QT1070 config KEYBOARD_QT1070
tristate "Atmel AT42QT1070 Touch Sensor Chip" tristate "Atmel AT42QT1070 Touch Sensor Chip"
depends on I2C depends on I2C
......
...@@ -50,6 +50,7 @@ obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o ...@@ -50,6 +50,7 @@ obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o
obj-$(CONFIG_KEYBOARD_PMIC8XXX) += pmic8xxx-keypad.o obj-$(CONFIG_KEYBOARD_PMIC8XXX) += pmic8xxx-keypad.o
obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o
obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
obj-$(CONFIG_KEYBOARD_QT1050) += qt1050.o
obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o
obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
......
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