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It's historical cruft and will probably go away as other similar drivers did. It could be implemented with the FunctionFS gadget now. The Linux kernel was much less capable of meeting their needs when they started out and is still missing some capabilities they actually need.

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There's very little difference between the generic Android kernel and the mainline kernel today since people have been working on landing those features upstream and adapting Android to use the newer Linux kernel capabilities instead of the earlier downstream implementations.

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ADB was reimplemented FunctionFS so it just seems no one has gotten around to a similar migration for MTP. The standard implementation of MTP is also extremely inefficient to the point that many people use ADB simply for faster transfer to and from external storage.

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Since most mobile devices need millions of lines of out-of-tree code for SoC drivers, eliminating the few small remaining differences between the generic Android kernel and mainline seems to be on the backburner. A few thousand extra lines of non-mainline code isn't significant.

9:03 PM · Sep 6, 2018Twitter Web Client