platform/chrome: Add cros_ec_lpc driver for x86 devices
Chromebooks have an Embedded Controller (EC) that is used to
implement various functions such as keyboard, power and battery.
The AP can communicate with the EC through different bus types
such as I2C, SPI or LPC.
The cros_ec mfd driver is then composed of a core driver that
register the sub-devices as mfd cells and provide a high level
communication interface that is used by the rest of the kernel
and bus specific interfaces modules.
Each connection method then has its own driver, which register
with the EC driver interface-agnostic interface.
Currently, there are drivers to communicate with the EC over
I2C and SPI and this driver adds support for LPC.
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 440ed77..6c5f5a1 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -39,4 +39,16 @@
The module will be called chromeos_pstore.
+config CROS_EC_LPC
+ tristate "ChromeOS Embedded Controller (LPC)"
+ depends on MFD_CROS_EC
+ help
+ If you say Y here, you get support for talking to the ChromeOS EC
+ over an LPC bus. This uses a simple byte-level protocol with a
+ checksum. This is used for userspace access only. The kernel
+ typically has its own communication methods.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cros_ec_lpc.
+
endif # CHROMEOS_PLATFORMS