Input: add ADC resistor ladder driver
A common way of multiplexing buttons on a single input in cheap devices is
to use a resistor ladder on an ADC. This driver supports that configuration
by polling an ADC channel provided by IIO.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 509608c..cbd75cf 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -12,6 +12,21 @@
if INPUT_KEYBOARD
+config KEYBOARD_ADC
+ tristate "ADC Ladder Buttons"
+ depends on IIO
+ select INPUT_POLLDEV
+ help
+ This driver implements support for buttons connected
+ to an ADC using a resistor ladder.
+
+ Say Y here if your device has such buttons connected to an ADC. Your
+ board-specific setup logic must also provide a configuration data
+ for mapping voltages to buttons.
+
+ To compile this driver as a module, choose M here: the
+ module will be called adc_keys.
+
config KEYBOARD_ADP5520
tristate "Keypad Support for ADP5520 PMIC"
depends on PMIC_ADP5520