[lm-sensors] Output problem with adcxx on at91

[John Rippetoe <jrippetoe@comconcepts.com>]

I am attempting to setup lm-sensors on an embedded platform, more 
specifically the Micromint Electrum 100.  I'm experiencing an issue with 
the output of the sensors program where the output is obviously bogus, 
especially given that all the values are identical.  Some basic details 
about the system:

- 6.04 Debian squeeze
- Atmel AT91SAM9G20 cpu (armv5)
- ADC128S052 SPI ADC
- atmel_spi driver built in to pre-compiled kernel
- hwmon, and adcxx loaded as modules later

The adcxx kernel module successfully loads and binds to the device. 
Reading the sysfs files it creates for each input, the same value of 
52799 is seen on each.  I know the device works because I have tested it 
with some userland example code provided by the manufacturer and get 
expected values for various inputs.

I initially had an issue with getting the adcxx module to bind with the 
device, but found that the problem was because of an alias problem.  In 
./arch/arm/mach-at91/board-electrum-100.c the ADC was declared with an 
alias as shown in the code segment below:

/static struct spi_board_info ek_spi_devices[] = {
/  .....
/    {    /* ADC128S052 analog inputs */
/        .modalias    = "adc128s052",
/        .chip_select    = 2,
/        .max_speed_hz    = 8 * 1000 * 1000,
/        .bus_num    = 1,
/    },
/  .....

Rather than change the alias in board-electrum-100.c and have to 
recompile and install a new kernel, I opted to add the alias as shown 
above to adcxx_ids[] in adcxx.c

/static const struct spi_device_id adcxx_ids[] = {
/    { "adcxx1s", 1 },
/    { "adcxx2s", 2 },
/    { "adcxx4s", 4 },
/    { "adcxx8s", 8 },
/    { "adc128s052", 8},   <-- added here
/    { },
/};

With that done, sensors starting giving me output, just not anything 
worth reading.  At this point I'm a little baffled as to what is causing 
this and crawling the internet has turned up nothing. Here is my output 
for sensors:

electrum100:~# sensors
adcxx8s-spi-1-2
Adapter: SPI adapter
in0:         +52.80 V
in1:         +52.80 V
in2:         +52.80 V
in3:         +52.80 V
in4:         +52.80 V
in5:         +52.80 V
in6:         +52.80 V
in7:         +52.80 V


Any help would be greatly appreciated.  Thank you.

     - John

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