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platform/chrome: Add Type C connector class driver

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Add a driver to implement the Type C connector class for Chrome OS
devices with ECs (Embedded Controllers).

The driver relies on firmware device specifications for various port
attributes. On ACPI platforms, this is specified using the logical
device with HID GOOG0014. On DT platforms, this is specified using the
DT node with compatible string "google,cros-ec-typec".

The driver reads the device FW node and uses the port attributes to
register the typec ports with the Type C connector class framework, but
doesn't do much else.

Subsequent patches will add more functionality to the driver, including
obtaining current port information (polarity, vconn role, current power
role etc.) after querying the EC.

Co-developed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Prashant Malani
2020-03-16 02:00:17 -07:00
committed by Enric Balletbo i Serra
parent a88214089d
commit fdc6b21e24
3 changed files with 250 additions and 0 deletions
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11
drivers/platform/chrome/Kconfig
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@@ -214,6 +214,17 @@ config CROS_EC_SYSFS
To compile this driver as a module, choose M here: the
module will be called cros_ec_sysfs.
config CROS_EC_TYPEC
tristate "ChromeOS EC Type-C Connector Control"
depends on MFD_CROS_EC_DEV && TYPEC
default MFD_CROS_EC_DEV
help
If you say Y here, you get support for accessing Type C connector
information from the Chrome OS EC.
To compile this driver as a module, choose M here: the module will be
called cros_ec_typec.
config CROS_USBPD_LOGGER
tristate "Logging driver for USB PD charger"
depends on CHARGER_CROS_USBPD