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From Htc-linux

Commands:

read    -> 0xfd33, 3, { reg, 0x02, 0}
readRDS -> 0xfd33, 3, {0x05, 0xc0, 0}
readX   -> 0xfd33, 2, { reg, 0x02}
write   -> 0xfd35, 5, { reg, 0x02, 0, MSB, LSB}
power   -> 0xfd37, 1, {0/1}

Registers:

0 -?
1  RSSI
2 -?
3 -?
4 -?
5  RDSread
6 -?
7 -?
8 -?
9 -?
a  Frequency
b  AF
c  mono/stereo
d  stereo blend
e  deemph
f  RSSI search level
10 band start
11 mute start
12 pause lev
13 pause duration
14 RDS threshold
15 -?
16 -?
17 PI mask
18 PI
19 RDS/RBDS
1a enable interrupt (RDS, etc.)
1b seek direction
1c volume
1d audio enable
1e -?
1f -?
20 poweron FM+RDS (3)
...
2d AF jump
2e -?
2f RDS fifo
...
64
65
66

Frequencies (MHz):

87.5 0x155cc
108  0x1a5e0
76   0x128e0
90   0x15f90

Frequency step: 50kHz

Frequency index: idx=(f-fmin)/step