[v1,0/2] usb: typec: ucsi: sysfs mailbox for commands

Message

Heikki Krogerus Feb. 6, 2025, 2:19 p.m. UTC

Hi,

UCSI has commands that can be used to configure the platform policy
manager (PPM, which is the EC in most cases) on top of individual
connectors. That kind of commands are very UCSI specific, and because
of that, don't fit very well into any of our existing device classes
that are all designed to represent the connectors in generic fashion.

Nevertheless, the user space needs some way to configure also the
entire PPM with these commands. Exposing the UCSI data structure as a
mailbox file to the user space felt to me as the simplest way to do
that, so that's why this proposal.

This mailbox is of course not limited to those commands only - any
UCSI command can be send to the PPM with it. Łukasz, would this cover
also your debugging and testing needs that you were planning the
netlink for (although, for the ChromeOS UCSI driver only)?

Br,

Heikki Krogerus (2):
  usb: typec: ucsi: Command mailbox interface for the userspace
  tools: usb: UCSI command testing tool

 Documentation/ABI/testing/sysfs-driver-ucsi |  20 ++
 drivers/usb/typec/ucsi/Makefile             |   2 +-
 drivers/usb/typec/ucsi/sysfs.c              | 127 ++++++++++
 drivers/usb/typec/ucsi/ucsi.c               |  31 ++-
 drivers/usb/typec/ucsi/ucsi.h               |   7 +
 tools/usb/.gitignore                        |   1 +
 tools/usb/Build                             |   1 +
 tools/usb/Makefile                          |   8 +-
 tools/usb/ucsi.c                            | 250 ++++++++++++++++++++
 9 files changed, 432 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-ucsi
 create mode 100644 drivers/usb/typec/ucsi/sysfs.c
 create mode 100644 tools/usb/ucsi.c