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Add support for `LiFePO4wered-Pi`

It should be fairly straightforward to clone the IPMI plugin to read lifepo4wered-cli.

It will likely have to hard-code the units of registers, since they don't provide them explicitly.

Most are raw register data, but according to the manual the following registers are reported in integer millivolts:

  • VBAT (called VIN prior to 2016-11-10)
  • VOUT
  • VBAT_MIN (née VIN_MIN)
  • VBAT_SHDN (née VIN_SHDN)
  • VBAT_BOOT (née VIN_BOOT)
  • VOUT_MAX
  • VOFFSET_ADC

These values should be converted and reported as a floating point value in volts.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information