usb: typec: Add driver for DisplayPort alternate mode

What:		/sys/bus/typec/devices/.../displayport/configuration

Date:		July 2018

Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>

Description:

		Shows the current DisplayPort configuration for the connector.

		Valid values are USB, source and sink. Source means DisplayPort

		source, and sink means DisplayPort sink.

		All supported configurations are listed as space separated list

		with the active one wrapped in square brackets.

		Source example:

			USB [source] sink

		The configuration can be changed by writing to the file

		Note. USB configuration does not equal to Exit Mode. It is

		separate configuration defined in VESA DisplayPort Alt Mode on

		USB Type-C Standard. Functionally it equals to the situation

		where the mode has been exited (to exit the mode, see

		Documentation/ABI/testing/sysfs-bus-typec, and use file

		/sys/bus/typec/devices/.../active).

What:		/sys/bus/typec/devices/.../displayport/pin_assignment

Date:		July 2018

Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>

Description:

		VESA DisplayPort Alt Mode on USB Type-C Standard defines six

		different pin assignments for USB Type-C connector that are

		labeled A, B, C, D, E, and F. The supported pin assignments are

		listed as space separated list with the active one wrapped in

		square brackets.

		Example:

			C [D]

		Pin assignment can be changed by writing to the file. It is

		possible to set pin assignment before configuration has been

		set, but the assignment will not be active before the

		connector is actually configured.

		Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard

		version 1.0b, pin assignments A, B, and F are deprecated. Only

		pin assignment D can now carry simultaneously one channel of

		USB SuperSpeed protocol. From user perspective pin assignments C

		and E are equal, where all channels on the connector are used

		for carrying DisplayPort protocol (allowing higher resolutions).

source "drivers/usb/typec/mux/Kconfig"

source "drivers/usb/typec/altmodes/Kconfig"

endif # TYPEC

# SPDX-License-Identifier: GPL-2.0

obj-$(CONFIG_TYPEC)		+= typec.o

typec-y				:= class.o mux.o bus.o

obj-$(CONFIG_TYPEC)		+= altmodes/

obj-$(CONFIG_TYPEC_TCPM)	+= tcpm.o

obj-y				+= fusb302/

obj-$(CONFIG_TYPEC_WCOVE)	+= typec_wcove.o

menu "USB Type-C Alternate Mode drivers"

config TYPEC_DP_ALTMODE

	tristate "DisplayPort Alternate Mode driver"

	help

	  DisplayPort USB Type-C Alternate Mode allows DisplayPort

	  displays and adapters to be attached to the USB Type-C

	  connectors on the system.

	  To compile this driver as a module, choose M here: the

	  module will be called typec_displayport.

endmenu

obj-$(CONFIG_TYPEC_DP_ALTMODE)		+= typec_displayport.o

typec_displayport-y			:= displayport.o