Input: add Analog Devices AD714x captouch input driver

AD7142 and AD7147 are integrated capacitance-to-digital converters
(CDCs) with on-chip environmental calibration for use in systems
requiring a novel user input method. The AD7142 and AD7147 can interface
to external capacitance sensors implementing functions such as buttons,
scrollwheels, sliders, touchpads and so on.

The chips don't restrict the specific usage. Depending on the hardware
connection, one special target board can include one or several these
components. The platform_data for the device's "struct device" holds
these information. The data-struct defined in head file descript the
hardware feature of button/scrollwheel/slider/touchpad components on
target boards, which need be filled in the arch/mach-/.

As the result, the driver is independent of boards. It gets the
components layout from the platform_data, registers related devices,
fullfills the algorithms and state machines for these components and
report related input events to up level.

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 54a9c2d0ba1c..a4b9dc5cf456 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -22,6 +22,36 @@ config INPUT_88PM860X_ONKEY
           To compile this driver as a module, choose M here: the module
           will be called 88pm860x_onkey.
 
+config INPUT_AD714X
+        tristate "Analog Devices AD714x Capacitance Touch Sensor"
+        help
+          Say Y here if you want to support an AD7142/AD7147 touch sensor.
+
+          You should select a bus connection too.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x.
+
+config INPUT_AD714X_I2C
+        tristate "support I2C bus connection"
+        depends on INPUT_AD714X && I2C
+        default y
+        help
+          Say Y here if you have AD7142/AD7147 hooked to an I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x-i2c.
+
+config INPUT_AD714X_SPI
+        tristate "support SPI bus connection"
+        depends on INPUT_AD714X && SPI
+        default y
+        help
+          Say Y here if you have AD7142/AD7147 hooked to a SPI bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x-spi.
+
 config INPUT_PCSPKR
         tristate "PC Speaker support"
         depends on PCSPKR_PLATFORM