Hi all,
I've got an ARM development board with Allwinner A20 SoC and AXP209
charging controller for the attached battery. I'm using the USB OTG
port for a MIDI USB gadget and would like to control how and when my
board tries to charge the battery via the OTG USB connection. When
attached to a USB wall plug it should charge at high speed, to a
"normal" USB port at slower speed and when attached to an iPad (via
camera connection kit) it should not charge at all.
I think I found the relevant registers on the AXP209 chip that control
the charging current, but I don't know how to detect how much power
the USB connection can supply, and whether or not I'm connected to the
iPad (to disable charging altogether).
Do I even need to poke the AXP directly, or is there some kind of
kernel device that I can control, maybe even from userland?
I'm currently running a linux-sunxi 3.4 kernel.
All the best,
Marcus
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