Hello list,
I'm implementing an LDD for the MCP3422 ADC from microchip. I'm heading at kernel inclusion, so I'm asking here before doing it too much wrong.
I'm reading Documentation/hwmon/sysfs-interface, and I find that the chip adhere poorly to that specification:
0) The chip has an 18bits ADC, but the unit of in0_input should be in mV, I don't want to waste the 18bits precision. Right now I have the unit in nV and it works quite well, but If I understand correctly, it's not right for hwmon specs.
1) The chip provides up to 4 differential input channels, but only one at a time could be read after setting the corresponding channel in a registry. How should I manage 4 different inputs that maps the same device registry to be compliant?
2) Cause the device has 4 differential inputs, it could output negative values. Are they permitted?
3) The device has various configuration parameters (like varialbe 12/14/16/18bits precision, variable gain), could them be added as external attributes?
4) The update_interval depends on the precion (device is faster with less precision), could it be updated at runtime if user changes precision?
Thank you four support!
Angelo
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