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[Q] Where in the source code is AC charging handled?

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By Kaktrot, Junior Member on 11th January 2014, 11:17 PM
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Could someone please direct me to the file in the manta source code what decides if the tablet should be charging or not?

I am trying to learn how to do some kernel hacking, and would like to start with a simple project.

I just got a Nexus 10 for Christmas, and I love it. I got a powered OTG cable and usb hub. Keyboard, mouse, and gamepad work flawlessly in CM, but the Nexus doesn't charge while I'm using them. I also have an Atrix 2, which I'm not very fond of, but it charges just fine under the same setup. The source for the Atrix 2 isn't available, so I got the source code for the Droid Bionic which I believe is close to identical if it's not the same phone. Once upon a time, I knew how to code, and I want to re-learn. I have plenty of manuals laying around.

What I'd like to do is re-compile the kernel with better behavior for OTG. I want it to check for incoming voltage, and AC charge if it sees it.

The only problem is that I'm completely unfamiliar with the kernel and system sources. I see the source for manta here:
(woops! Can't post links. Github. android_kernel_samsung_manta)

and the Droid Bionic here:
(Ditto. Sourceforge. droidbionic)

I was hoping someone could tell me whereabouts in the CM code it actually detects that a USB cable has been plugged in, and decides what actions to take. I can look back and forth between the two and sort it out, and learn a bit about how it's plumbed together. Additional commentary on how I should proceed would be most appreciated.

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