ableos/kernel/src/device_tree.rs

//! A tree of hardware devices

use {
    crate::alloc::string::ToString,
    alloc::{string::String, vec::Vec},
    core::fmt,
    hashbrown::HashMap,
};
/// A device object.
/// TODO define device
pub type Device = xml::XMLElement;

/// A tree of devices
// TODO: alphabatize this list
#[derive(Debug)]
pub struct DeviceTree {
    /// The device tree
    pub devices: HashMap<String, Vec<Device>>,
}
impl DeviceTree {
    /// Build the device tree. Does not populate the device tree
    pub fn new() -> Self {
        let mut dt = Self {
            devices: HashMap::new(),
        };

        // Human input devices
        {
            dt.devices.insert("Mice".to_string(), Vec::new());
            dt.devices.insert("Keyboards".to_string(), Vec::new());
            dt.devices.insert("Controllers".to_string(), Vec::new());
            // Human Input Devices that do not fit into other catagories go in this spot
            dt.devices.insert("Generic HIDs".to_string(), Vec::new());
        }

        {
            dt.devices.insert("Disk Drives".to_string(), Vec::new());
            dt.devices.insert("CD Drives".to_string(), Vec::new());
        }

        dt.devices.insert("Batteries".to_string(), Vec::new());
        dt.devices.insert("Monitors".to_string(), Vec::new());
        dt.devices.insert("GPUs".to_string(), Vec::new());
        dt.devices.insert("CPUs".to_string(), Vec::new());

        dt.devices.insert("USB".to_string(), Vec::new());
        dt.devices.insert("Serial Ports".to_string(), Vec::new());
        dt.devices.insert("Cameras".to_string(), Vec::new());
        dt.devices
            .insert("Biometric Devices".to_string(), Vec::new());

        dt
    }
}
use crate::utils::TAB;
use crate::tab;
impl fmt::Display for DeviceTree {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(f)?;
        for (device_type, devices) in &self.devices {
            writeln!(f, "\r{}{}/\r", tab!(1), device_type)?;
            for device in devices {
                writeln!(f, "{}{}/\r", tab!(2), device.name)?;
                for attr in &device.attributes {
                    writeln!(f, "{}{}\r", tab!(3), attr)?;
                }
                for child in &device.children {
                    writeln!(f, "{}{}\r", tab!(3), child.name)?;
                    for attr in &child.attributes {
                        writeln!(f, "{}{}\r", tab!(4), attr)?;
                    }
                    for child in &child.children {
                        writeln!(f, "{}{}\r", tab!(4), child.name)?;
                        for attr in &child.attributes {
                            writeln!(f, "{}{}\r", tab!(5), attr)?;
                        }
                    }
                }
            }
        }
        Ok(())
    }
}