linux-kernel - [PATCH v6 0/4] usb: Linking ports to their Type-C connectors

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Message-Id: <20210407065555.88110-1-heikki.krogerus@linux.intel.com>
Date:   Wed,  7 Apr 2021 09:55:51 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Guenter Roeck <linux@...ck-us.net>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 0/4] usb: Linking ports to their Type-C connectors

Hi,

These are the remaining four patches of the series, now rebased on top
of the latest usb-next. No other changes.

v5 cover letter:

I have to use IS_REACHABLE() instead of IS_ENABLED() also in
include/linux/usb.h. Otherwise compilation will fail if the Type-C
class is build-in while USB is a module.

I'm sorry for re-sending these so fast, immediately after v4. Normally
I would wait, but I'll be taking a short vacation starting from right
now, and I'm still hoping to get these into v5.13.

v4 cover letter:

One more version. I used #ifdef when I should have used #if
IS_DEFINED(). Thanks Guenter for pointing that out.

I'm sending this version right away because of the holidays. I'm not
changing anything else except that one fix.

v3: cover letter:

Third version: ifdefs now in the header files as they should be.

v2 cover letter:

This is the second version of this series. The "Iterator for ports"
patch is now moved to the end of the series (5/6).

I'm now using usb_for_each_dev() in usb_for_each_port like Alan
suggested, and I'm now using usb_port_peer_mutex to lock the ports
while we're dealing with them in __each_hub().

The original cover letter:

Adding a simple function typec_link_port() that can be used to create
a symlink "connector" that points to the USB Type-C connector of a
port. It is used with USB ports initially, but hopefully later also
with other things like DisplayPorts.

Being able to see which connector is connected to a port is important
in general, but it is really important when for example the data or
power role of a device needs to swapped. The user probable wants to
know which USB device is disconnected if role swap on a USB Type-C
connector is executed.

Hope these are OK.

thanks,

Heikki Krogerus (4):
  usb: typec: Port mapping utility
  usb: Link the ports to the connectors they are attached to
  usb: Iterator for ports
  usb: typec: Link all ports during connector registration

 Documentation/ABI/testing/sysfs-bus-usb |   9 +
 drivers/usb/core/port.c                 |   3 +
 drivers/usb/core/usb.c                  |  46 ++++
 drivers/usb/typec/Makefile              |   2 +-
 drivers/usb/typec/class.c               |  12 +-
 drivers/usb/typec/class.h               |   9 +
 drivers/usb/typec/port-mapper.c         | 277 ++++++++++++++++++++++++
 include/linux/usb.h                     |   9 +
 include/linux/usb/typec.h               |  13 ++
 9 files changed, 377 insertions(+), 3 deletions(-)
 create mode 100644 drivers/usb/typec/port-mapper.c

-- 
2.30.2