Usermode PPM implementation

Usermode UCSI PPM implementation for evaluation and testing usage. Try using this with the ucsi_um_test kernel driver.

Setup

For usermode implementations, we use libi2c and libgpiod to provide an smbus implementation. You will need the right libraries to build:

sudo apt-get install libi2c-dev libgpiod-dev

Architecture

┌─────────┐
│OPM      │
│kernel or│
│cli      │
└────┬────┘
     │
     │
     ▼          ┌───────────┐
 ┌────────┐     │ PD Driver │
 │        ├────►│           │
 │  PPM   │     ├───────────┤
 │        │     │           │
 └────────┘     │ I2C Driver│
                └───────────┘

The usermode ppm implementation consists of the PPM task, the PD driver and the I2C driver backing it. The OPM will either be a CLI (for locally triggering some functionality) or the ucsi_um_test kernel module.