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Apple's Non-Standards and Linux

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Linux
Hardware
  • Linux 5.7 To See USB Fast Charge Support For Apple iOS Devices

    The Linux 5.7 kernel that will be out in the late spring / early summer is poised to see support for USB fast charging support for Apple iOS devices.

    Currently if charging an Apple iPhone / iPad from a USB port by default it will not draw more than 500mA per specifications. However, iOS devices can draw more power when communicated to do so via Apple's protocol. With Linux 5.7 a new "apple-mfi-fastcharge" driver will allow this capability of up to 2500mA.

    The apple-mfi-fastcharge driver will allow setting the power supply property via sysfs to "fast" and in turn lets the iOS device draw more power from the USB port, similar to the behavior of MFi certified chargers.

  • Apple Firmware Update For Magic Keyboards Decides To Change The Fn Key

    Linux has supported the Apple Magic Keyboards since 2018 handling the Bluetooth connectivity and also needing some special handling for the numeric keypad. While that normally would be the end of the story, recent firmware updates to the Apple Magic Keyboard have caused problems.

    Newer Apple firmware updates to the Magic Keyboards have caused the function (Fn) keys to be reported differently. So on current Linux kernels when running on an Apple keyboard with updated firmware, the Fn key may not behave correctly.

Linux to get iPhone fast charging support

  • Linux to get iPhone fast charging support

    Before the iPhone 11 Pro was released, all iPhones shipped with slow 5W chargers. However, now that the iPhone 11 Pro and the iPhone 11 Pro Max come bundled with 18W fast chargers, it makes sense to have computers support the technology as well.

    To add fast charging support for iPhones, the upcoming Linux Kernel 5.7 will add support for the latest fast charging technology. To be more specific, it’s not only for iPhones but also iPads which use 24W chargers.

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Linux 5.6

So I'll admit to vacillating between doing this 5.6 release and doing
another -rc.

This has a bit more changes than I'd like, but they are mostly from
davem's networking fixes pulls, and David feels comfy with them. And I
looked over the diff, and none of it looks scary. It's just slightly
more than I'd have preferred at this stage - not doesn't really seem
worth delaying a release over.

So about half the diff from the final week is network driver fixlets,
and some minor core networking fixes. Another 20% is tooling - mostly
bpf and netfilter selftests (but also some perf work).

The rest is "misc" - mostly random drivers (gpio, rdma, input) and DTS
files. With a smattering of fixes elsewhere (a couple of afs fixes,
some vm fixes, etc).

The shortlog is appended, nothing really looks all that exciting, and
most of the discussions I've seen are already about things for the
next merge window.

Which obviously opens now as of the release, and I'll start doing
pulls tomorrow. I already have a couple of pull requests in pending in
my inbox - thank you.

And while I haven't really seen any real sign of kernel development
being impacted by all the coronavirus activity - I suspect a lot of us
work from home even normally, and my daughter laughed at me and called
me a "social distancing champ" the other day - it may be worth just
mentioning: I think we're all reading the news and slightly
distracted.  I'm currently going by the assumption that we'll have a
fairly normal 5.7 release, and there doesn't seem to be any signs
saying otherwise, but hey, people may have better-than-usual reasons
for missing the merge window. Let me know if you know of some
subsystem that ends up being affected.

So we'll play it by ear and see what happens. It's not like the merge
window is more important than your health, or the health of people
around you.

                  Linus
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