Keypad connector on the e740:

pin             function
1
2		Vss
3
4
5		matrix on (record,
6		matrix on (jogdial common, 
7		matrix on (right, D-pad common?, 
8		BTTXD on PXA (D13)
9		BTRXD on PXA (B13)
10		matrix on (left, jogdial centre, 
11		matrix on (bottomleft, jogdial down, 
12		matrix on (record, bottomright, 
13		matrix on (topright, jogdial up, 
14		matrix on (topleft, 
15
16
17
18
19		charge indicate output (to D12 / GPIO 17 on PXA)
20
21
22
23
24
25
26
27
28		AC connected indicate (M12 on PXA / GPIO 22)
29,31,33,35 +Ve input from AC connector
30,32,34,36 Vss