char interface to sdio, chdio.c

From: Greg KH
Date: Tue Jul 15 2014 - 23:22:32 EST

Hi Stephen.

I had some people ask me about a sdio userspace interface, and ran
across the chdio.c file as found in the MSM android kernel trees:

Any reason why this hasn't been submitted upstream? Or has it, and was
it rejected?

Also, what userspace code uses this? Is there some android-specific
code somewhere that does a weird mix of sysfs and char control of the
hardware? And what type of SDIO devices are controlled with this?


greg k-h
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