Input: add generic GPIO-tilt driver

There exist tilt switches that simply report their tilt-state via
some gpios. The number and orientation of their axes can vary
depending on the switch used and the build of the device. Also two
or more one-axis switches could be combined to provide multi-dimensional
orientation.

One example of a device using such a switch is the family of Qisda
ebook readers, where the switch provides information about the
landscape / portrait orientation of the device. The example in
Documentation/input/gpio-tilt.txt documents exactly this one-axis
device.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 22d875fde53a..e53b443d1e33 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -179,6 +179,20 @@ config INPUT_APANEL
          To compile this driver as a module, choose M here: the module will
          be called apanel.
 
+config INPUT_GPIO_TILT_POLLED
+        tristate "Polled GPIO tilt switch"
+        depends on GENERIC_GPIO
+        select INPUT_POLLDEV
+        help
+          This driver implements support for tilt switches connected
+          to GPIO pins that are not capable of generating interrupts.
+
+          The list of gpios to use and the mapping of their states
+          to specific angles is done via platform data.
+
+          To compile this driver as a module, choose M here: the
+          module will be called gpio_tilt_polled.
+
 config INPUT_IXP4XX_BEEPER
         tristate "IXP4XX Beeper support"
         depends on ARCH_IXP4XX