S the headphone jack on an iPad an input output or just output? Is it tip ring sleeve or tip ring ring sleeve?

I'm hesitant to recommend any information on this other than use a browser pointed to "iphone audio jack schematic".

If you look closely at an Apple headphone jack (with mic) you'll see it actually has four instead of the three standard rings. The last one, closest to the base, is the microphone contact. The iPad works fine with these headphones, and yes, the mic works.

As stevnim suggests, a search for the iPhone jack pinout should get you diagram. I used to have a good link, but it seems to have gotten lost.