[PATCH 0/4] HID: Use wVersionID for device version

[Daniel Schaefer <dhs@frame.work>]

The motivation for this patch series is that the touchpads on Framework
Laptops expose their firmware version in the I2C HID device descriptor.
So the vendor's windows tool uses that to check the firmware version,
but Linux does not expose it to userspace at all.
We have added vendor specific HID reports to newer firmware for reading
the firmware version -that means however, the old firmware still cannot
reports its version to Linux at all.

I found that Mario has been planning to add a way for the kernel to
report HID firmware versions to userspace and added support to fwupd.
There's a kernel patch in flight that also exports this:
https://lwn.net/ml/all/20260220070533.4083667-1-derekjohn.clark@gmail.com/

While adding this for I2C HID devices, I noticed that the goodix-spi and
surface drivers also expose the HID protocol version, which is not very
useful. I do not have hardware to test those

The i2c-hid and core changes were tested on Framework Laptop 16.
I also added support to hidapi for reading the new uevent, if not
provided by USB already: https://github.com/libusb/hidapi/pull/777

Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <bentiss@kernel.org>
Cc: linux-input@vger.kernel.org
Cc: linux@frame.work
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Maximilian Luz <luzmaximilian@gmail.com>
Cc: Richard Hughes <richard@hughsie.com>
Cc: Charles Wang <charles.goodix@gmail.com>

Daniel Schaefer (4):
  HID: i2c-hid: Use wVersionID for device version
  HID: goodix-spi: Use version_id for device version
  HID: surface: Use device version instead of HID spec version
  HID: core: Export device version via HID_FIRMWARE_VERSION uevent

 drivers/hid/hid-core.c                     | 3 +++
 drivers/hid/hid-goodix-spi.c               | 2 +-
 drivers/hid/i2c-hid/i2c-hid-core.c         | 2 +-
 drivers/hid/surface-hid/surface_hid_core.c | 2 +-
 4 files changed, 6 insertions(+), 3 deletions(-)

-- 
2.52.0