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ib-tb: support magic keyboard backlight #4

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@Redecorating Redecorating commented Oct 16, 2021

MacBookPro16,1/2/3/4 and MacBookAir9,1 have the magic keyboard, with the
keyboard backlight controlled via the Touch Bar Backlight USB device.

We check that the internal keyboard's USB product ID matches that of
models with the magic keyboard, and then we create a sysfs led class
dev.

When setting the brightness to 15 (one less than the max of 16), it
seems to have about a 50% chance of setting it to dim instead. This
doesn't happen for other values.

@Redecorating Redecorating marked this pull request as draft October 16, 2021 11:15
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Setting as draft while I figure out how to get it to change the brightness like windows does.

@Redecorating Redecorating marked this pull request as ready for review October 17, 2021 05:02
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It's been tested on MBP16,1 and MBP16,2

@Redecorating Redecorating marked this pull request as draft October 18, 2021 00:16
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drafting again as it seems to print backtraces on mbp15,1 (although the touchbar was still working). Also, its now been tested on mbp16,3

@Redecorating Redecorating marked this pull request as ready for review October 18, 2021 22:20
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aunali1 commented Jan 4, 2022

@Redecorating Is this ready to merge?

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The backlight doesn't get freed when the module is unloaded, I'll try to fix that tomorrow.

MacBookPro16,1/2/3/4 have the magic keyboard, with the keyboard
backlight controlled via the Touch Bar Backlight USB device.

We check that the internal keyboard's USB product ID matches that of
models with the magic keyboard, and then we create a sysfs led class
dev that controls the backlight.
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@aunali1 it's ready now

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is this going to be merged?

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