[lm-sensors] sensors and i2cdump disagree on bus number

[Juerg Haefliger]

Hi all,

When running sensors (2.10.1) I get the following adapter information:
emc6d102-i2c-1-2e
Adapter: SMBus nForce2 adapter at 4c40

And i2cdump prints the following:
  Installed I2C busses:
    i2c-5       i2c             NVIDIA i2c adapter 2 at 0:05.0
    i2c-4       i2c             NVIDIA i2c adapter 1 at 0:05.0
    i2c-3       i2c             NVIDIA i2c adapter 0 at 0:05.0
    i2c-2       i2c             ivtv i2c driver #0
    i2c-1       smbus           SMBus nForce2 adapter at 4c40
    i2c-0       smbus           SMBus nForce2 adapter at 4c00

But in order to dump the register content of the emc6d102 I have to scan bus
0:

jabba:/home/juergh# i2cdump 0 0x2e
No size specified (using byte-data access)
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0, address 0x2e, mode byte
Continue? [Y/n] y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
20: 00 79 c1 c2 be 80 29 31 46 0b ff ff ff ff ff ff    .y????)1F?......
30: 55 ff ff 00 00 00 00 00 00 00 00 00 00 00 5c 8a    U.............\?
40: 05 91 40 00 00 ff 00 ff 00 ff 00 ff 00 ff 81 7f    ??@...........??
50: 81 7f 81 7f ff ff ff ff ff ff ff ff 42 62 62 cb    ????........Bbb?
60: cb db e0 00 55 80 80 5a 5a 3c 64 64 4d 40 40 00    ???.U??ZZ<ddM@@.
70: 55 ff ff 09 09 09 09 09 09 00 10 00 40 00 ec 18    U..??????.?. at .??
80: 7e a4 0e 00 60 90 99 90 c1 00 4d 4d 0b 0b 0d 00    ~??.`????.MM???.
90: 04 04 04 04 0c 0c 0c 5a f1 c2 00 00 ff 00 ff 00    ???????Z??......
a0: 00 00 0c 00 02 00 00 0b 0b fe ff fe ff ff ff ff    ..?.?..???.?....
b0: ff 00 00 00 00 00 28 28 0e 0e 2b 2b 00 00 00 00    ......((??++....
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

Scanning bus 1 on the other hand returns all FFs:

jabba:/home/juergh# i2cdump 1 0x2c
No size specified (using byte-data access)
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1, address 0x2c, mode byte
Continue? [Y/n] y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX

regards
...juerg
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