input: Add ChromeOS EC keyboard driver

Use the key-matrix layer to interpret key scan information from the EC
and inject input based on the FDT-supplied key map. This driver registers
itself with the ChromeOS EC driver to perform communications.

The matrix-keypad FDT binding is used with a small addition to control
ghosting.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Luigi Semenzato <semenzato@chromium.org>
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index ac0500667000..6a195d5e90ff 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -628,4 +628,16 @@ config KEYBOARD_W90P910
           To compile this driver as a module, choose M here: the
           module will be called w90p910_keypad.
 
+config KEYBOARD_CROS_EC
+        tristate "ChromeOS EC keyboard"
+        select INPUT_MATRIXKMAP
+        depends on MFD_CROS_EC
+        help
+          Say Y here to enable the matrix keyboard used by ChromeOS devices
+          and implemented on the ChromeOS EC. You must enable one bus option
+          (MFD_CROS_EC_I2C or MFD_CROS_EC_SPI) to use this.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cros_ec_keyb.
+
 endif