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:

https://android.googlesource.com/kernel/msm/+/57b74303d6f033ab04be039379f6661337fb9279

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?

thanks,

greg k-h
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