Support smart charging and battery authentication status#167
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Authentic batteries in Surface devices are verified and paired with the motherboard during manufacturing or repair for quality assurance. Read the authentication status from the SAM and report it.
Newer Surface devices limit the battery charge to 80% based on usage patterns. Report the charge limit status and disengage it if requested. The charge limit is always controlled by the SAM and will be re-enabled after a few days depending on use.
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Added support for battery features reverse-engineered from the Windows drivers.
Authentic batteries in Surface devices are verified and paired with the motherboard during manufacturing or repair for quality assurance. Windows reads the authentication status and shows a warning message if the battery isn't genuine. This status can now be read from Linux.
Newer Surface devices limit the battery charge to 80% based on usage patterns. The Surface app on Windows has a button that disables the limit temporarily and charges the battery to 100%, but Linux previously had no way to control it. The battery driver now reports the smart charging status as a charge limit and lets users disable it by setting it to 100%. The charge limit is controlled by the SAM and gets re-enabled automatically after a few days, and re-enabling the limit manually doesn't seem to be possible.
Fixes linux-surface/linux-surface#1781, linux-surface/linux-surface#2070.