mod registers;

use std::env;
use std::process;
use log::{info, error, LevelFilter};

struct StderrLogger;
impl log::Log for StderrLogger {
    fn enabled(&self, md: &log::Metadata) -> bool { md.level() <= LevelFilter::Info }
    fn log(&self, r: &log::Record) { eprintln!("[{}] ehcid: {}", r.level(), r.args()); }
    fn flush(&self) {}
}

fn main() {
    log::set_logger(&StderrLogger).ok();
    log::set_max_level(LevelFilter::Info);

    let channel_fd: usize = match env::var("PCID_CLIENT_CHANNEL") {
        Ok(s) => match s.parse() { Ok(fd) => fd, Err(_) => { error!("invalid PCID_CLIENT_CHANNEL"); process::exit(1); } },
        Err(_) => { error!("PCID_CLIENT_CHANNEL not set"); process::exit(1); }
    };

    let device_path = env::var("PCID_DEVICE_PATH").unwrap_or_default();
    info!("EHCI USB 2.0 controller at {} (PCI fd: {})", device_path, channel_fd);

    // Enable bus mastering and MMIO via the channel
    let enable_cmd: [u8; 4] = [0x07, 0x00, 0x00, 0x00]; // IO + MEM + BUS_MASTER
    if let Err(e) = syscall::write(channel_fd, &enable_cmd) {
        error!("failed to enable device: {}", e);
    }

    info!("ehcid: initialized — ready for enumeration");
}