linux-kernel - [PATCH 0/3] usb: USB Type-C Class and driver for UCSI

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Date:	Tue,  9 Feb 2016 19:01:20 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Felipe Balbi <balbi@...nel.org>
Subject: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI

Hi,

The OS, or more precisely the user space, needs to be able to control
a few things regarding USB Type-C ports. The first thing that must be
allowed to be controlled is the data role. USB Type-C ports will
select the data role randomly with DRP ports. When USB PD is
supported, also independent (from data role) power role swapping can
be supported together with Alternate Mode control.

I'm proposing with this set a Class for the Type-C connectors that
gives the user space control over those things on top of getting basic
details about the USB Type-C connectors and also partners. The details
include the capabilities of the port, the supported data and power
roles, supported accessories (audio and debug), supported Alternate
Modes, USB PD support and of course the type of the partner (USB, Alt
Mode, Accessory or Charger), and more or less the same details about
the partner.

I'm not considering cables with this Class, and I have deliberately
left out some more technical details, like cable orientation, firstly
because I did not see much use for the user space from knowing that
an secondly because that kind of details are not always available for
example with UCSI.

So the interface to the user space is kept as simple as I dared to
make it.

NOTE: In case there is somebody wondering, this is not adding USB PD
support to Linux kernel. This is just about USB Type-C.

Heikki Krogerus (3):
  usb: USB Type-C Connector Class
  usb: type-c: USB Type-C Connector System Software Interface
  usb: type-c: UCSI ACPI driver

 drivers/usb/Kconfig            |   2 +
 drivers/usb/Makefile           |   2 +
 drivers/usb/type-c/Kconfig     |  25 +++
 drivers/usb/type-c/Makefile    |   3 +
 drivers/usb/type-c/typec.c     | 446 ++++++++++++++++++++++++++++++++++++++++
 drivers/usb/type-c/ucsi.c      | 450 +++++++++++++++++++++++++++++++++++++++++
 drivers/usb/type-c/ucsi.h      | 219 ++++++++++++++++++++
 drivers/usb/type-c/ucsi_acpi.c | 133 ++++++++++++
 include/linux/usb/typec.h      | 114 +++++++++++
 9 files changed, 1394 insertions(+)
 create mode 100644 drivers/usb/type-c/Kconfig
 create mode 100644 drivers/usb/type-c/Makefile
 create mode 100644 drivers/usb/type-c/typec.c
 create mode 100644 drivers/usb/type-c/ucsi.c
 create mode 100644 drivers/usb/type-c/ucsi.h
 create mode 100644 drivers/usb/type-c/ucsi_acpi.c
 create mode 100644 include/linux/usb/typec.h

-- 
2.7.0