Implement libswitch::power module

[vbe0201]

This is the tracking issue for the libswitch::power module containing drivers for the Switch's TI BQ24193, the Maxim 17050, and the Maxim 77620.

Required to complete #1.

Implementation

Max77620 driver has the highest priority. The others are nice to have, however low priority at the moment.

BQ24193

This is used for battery charging and should provide at least a function to retrieve the value (i16) of one of the following device properties, represented in an enum:

/// Representation of the BQ24193 device properties.
pub enum Properties {
    InputVoltageLimit,
    InputCurrentLimit,
    SystemMinimumVoltage,
    FastChargeCurrentLimit,
    ChargeVoltageLimit,
    RechargeThreshold,
    ThermalRegulation,
    ChargeStatus,
    TempStatus,
    DevId,
    ProductNumber,
}

These are to be retrieved over I2C. See the Technical Reference for details.

Max17050

Used for fuel gauging. Similar to the BQ24193, this has a similar system of retrieving values for certain device properties. The enum would however contain different members (notably a whole bunch more) with different values. See Technical Reference for details.

Max77620

Used for PMIC stuff. Hence, the driver should contain an abstraction of the device that holds its ID and the corresponding methods for configuring and managing the regulators which is done via I2C.

Resources

• TI BQ24193 Datasheet

• Max17050 Datasheet

• Linux kernel

• hekate project