LinuxKPI: enable class dev_groups attributes

[• hselasky]

Summary

This is necessary for backlight in DRM/KMS drivers:

% sysctl sys.class.backlight
sys.class.backlight.intel_backlight.bl_device.type: raw
sys.class.backlight.intel_backlight.bl_device.max_brightness: 65535
sys.class.backlight.intel_backlight.bl_device.actual_brightness: 5000
sys.class.backlight.intel_backlight.bl_device.brightness: 5000
sys.class.backlight.intel_backlight.bl_device.bl_power: 0

(the corresponding kms-drm patch is just removing the ifdef __linux__'es in linux_backlight.c. well, replacing them with a __FreeBSD_version check once this lands and gets a version number)

I think I've added the create_groups in the right place… it works, anyway :)

[val_packett.cool]

ping

[imp]

Seems fine to me. Does this cause an issue for other users of LinuxKPI?

[• hselasky]

I'll take it.

[• hselasky]

Found some bugs in the patch. Can you re-test? Also re-loading kernel module?

[val_packett.cool]

oh, i915 is reloadable, right. Everything works fine, can adjust brightness after reloading.

sys/compat/linuxkpi/common/include/linux/sysfs.h

63 ↗

(On Diff #62411)

why remove the comment? :)

[val_packett.cool]

ping

[• hselasky]

Who will submit this patch?

[val_packett.cool]

In D21564#485874, @hselasky wrote:

Who will submit this patch?

I'm not sure what this means exactly? Submit to where? You mean listed as submitter in the commit message? Doesn't matter, you don't have to say it was me :D

[• hselasky]

I'll handle it.