Add support for Chromium OS EC devices

[fandango96]

This PR adds the CROS_EC_DEV_IOCXCMD_V2 and CROS_EC_DEV_IOCEVENTMASK_V2 ioctls necessary for testing Chromium OS EC devices. My main use-case is to add support for the FPMCU to allow automated testing in libfprint.

PR showing use of the newly added ioctls here: https://gitlab.freedesktop.org/libfprint/libfprint/-/merge_requests/493

[fandango96]

not sure why the build fails only on s390x

[martinpitt]

Thanks @fandango96 ! Sorry, I don't have much time this week for a detailed review, as I'm travelling. But for s390 the build log shows a unit test failure:

# DEBUG: umockdev-ioctl.vala:904: Aborting client because ioctl tree for /dev/cros_fp is empty
stderr:
ioctl_varlenstruct_init_from_text: ioctl C014EC00: expected data length 67108884, but got 24 bytes from text data
ERROR: libumockdev-preload: Server requested abort on device /dev/cros_fp, exiting
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s390x is big endian, this smells like reading a 32 bit int the wrong way around?

[fandango96]

Thank you @martinpitt, that was it - fixed.

[fandango96]

This looks fine, thanks! Do you need this in a new release, or is git main enough for the libfprint MR?

Thanks! git main is enough for the libfprint MR

[fandango96]

This looks fine, thanks! Do you need this in a new release, or is git main enough for the libfprint MR?

@martinpitt looks like the CI doesn't need a new release (as it uses main) but we do a version check during runtime and I'll need to update to a version including this change. Are you planning to do a new release soon?

[martinpitt]

@fandango96 Sure! I just released https://github.com/martinpitt/umockdev/releases/tag/0.18.4 and will upload to Fedora and Debian now.

[fandango96]

@fandango96 Sure! I just released https://github.com/martinpitt/umockdev/releases/tag/0.18.4 and will upload to Fedora and Debian now.

Thank you!