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 -- 2.47.2
