bbswitch-dkms fails with 5.6 kernels

ERROR (dkms apport): kernel package linux-headers-5.6.11-050611-generic is not supported
Error! Bad return status for module build on kernel: 5.6.11-050611-generic (x86_64)
Consult /var/lib/dkms/bbswitch/0.8/build/make.log for more information.

I have encountered same error during kernel update (5.5.15 -> 5.6.13). Latest version of 5.5.* compiles correctly (5.5.19). Looks like some breaking changes have been made within all 5.6.* kernel versions. Here are logs:

DKMS make.log for bbswitch-0.8 for kernel 5.6.13-050613-generic (x86_64)
Sat May 16 07:11:26 CEST 2020
make -C /lib/modules/5.6.13-050613-generic/build M="$(pwd)" modules
make[1]: Entering directory '/usr/src/linux-headers-5.6.13-050613-generic'
  CC [M] /var/lib/dkms/bbswitch/0.8/build/bbswitch.o
/var/lib/dkms/bbswitch/0.8/build/bbswitch.c: In function ‘bbswitch_init’:
/var/lib/dkms/bbswitch/0.8/build/bbswitch.c:460:63: error: passing argument 4 of ‘proc_create’ from incompatible pointer type [-Werror=incompatible-pointer-types]
  460 | acpi_entry = proc_create("bbswitch", 0664, acpi_root_dir, &bbswitch_fops);
      | ^~~~~~~~~~~~~~
      | |
      | struct file_operations *
In file included from ./include/acpi/acpi_bus.h:83,
                 from ./include/linux/acpi.h:32,
                 from /var/lib/dkms/bbswitch/0.8/build/bbswitch.c:32:
./include/linux/proc_fs.h:64:24: note: expected ‘const struct proc_ops *’ but argument is of type ‘struct file_operations *’
   64 | struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
      | ^~~~~~~~~~~
cc1: some warnings being treated as errors
scripts/Makefile.build:267: recipe for target '/var/lib/dkms/bbswitch/0.8/build/bbswitch.o' failed
make[2]: *** [/var/lib/dkms/bbswitch/0.8/build/bbswitch.o] Error 1
Makefile:1683: recipe for target '/var/lib/dkms/bbswitch/0.8/build' failed
make[1]: *** [/var/lib/dkms/bbswitch/0.8/build] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.6.13-050613-generic'
Makefile:13: recipe for target 'default' failed
make: *** [default] Error 2

Thank you for the bug report, the issue is the same as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959189

which is fixed in https://bugs.launchpad.net/ubuntu/+source/bbswitch/0.8-9

There is no linux-5.6 kernel in Ubuntu today. Please include a complete step-by-step test case for which kernel you want users to install and how.

linux-oem-5.6 is available in both focal and groovy

Hello Liu, or anyone else affected,

Accepted bbswitch into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/bbswitch/0.8-8ubuntu0.20.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

All autopkgtests for the newly accepted bbswitch (0.8-8ubuntu0.20.04.1) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

bbswitch/0.8-8ubuntu0.20.04.1 (armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#bbswitch

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

I've tested the build against linux-oem-20.04 (5.6) kernel and it succeeded. The autopkgtest failure on armhf is irrelevant, since this package is not even useful on non-x86 and quite frankly shouldn't be built on !amd64.

This bug was fixed in the package bbswitch - 0.8-8ubuntu0.20.04.1

---------------
bbswitch (0.8-8ubuntu0.20.04.1) focal; urgency=medium

  * debian/patches/0001-Use-proc_ops-structure-for-kernel-version-5.6.0.patch,
    debian/patches/fix-clean.patch,
    debian/patches/series:
    - Add support for Linux 5.6 and fix the clean target to run
      against the kernel version used for building (LP: #1878603)

 -- Alberto Milone <email address hidden> Mon, 18 May 2020 10:47:19 +0200

The verification of the Stable Release Update for bbswitch has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.