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// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//! `sound_card_init` is an user space binary to perform sound card initialization during boot time.
//!
//!
//! # Arguments
//!
//! * `sound_card_id` - The sound card name, ex: sofcmlmax98390d.
//!
//! Given the `sound_card_id`, this binary parses the CONF_DIR/<sound_card_id>.yaml to perform per sound card initialization.
//! The upstart job of `sound_card_init` is started by the udev event specified in /lib/udev/rules.d/99-sound_card_init.rules.
#![deny(missing_docs)]
use std::env;
use std::error;
use std::fmt;
use std::fs;
use std::io;
use std::path::PathBuf;
use std::process;
use std::string::String;
use getopts::Options;
use remain::sorted;
use sys_util::{error, info, syslog};
use max98390d::run_max98390d;
type Result<T> = std::result::Result<T, Error>;
const CONF_DIR: &str = "/etc/sound_card_init";
#[derive(Default)]
struct Args {
pub sound_card_id: String,
}
#[sorted]
#[derive(Debug)]
enum Error {
MissingOption(String),
OpenConfigFailed(String, io::Error),
ParseArgsFailed(getopts::Fail),
UnsupportedSoundCard(String),
}
impl error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use Error::*;
match self {
MissingOption(option) => write!(f, "missing required option: {}", option),
OpenConfigFailed(file, e) => write!(f, "failed to open file {}: {}", file, e),
ParseArgsFailed(e) => write!(f, "parse_args failed: {}", e),
UnsupportedSoundCard(name) => write!(f, "unsupported sound card: {}", name),
}
}
}
fn print_usage(opts: &Options) {
let brief = "Usage: sound_card_init [options]".to_owned();
print!("{}", opts.usage(&brief));
}
fn parse_args() -> Result<Args> {
let mut opts = Options::new();
opts.optopt("", "id", "sound card id", "ID");
opts.optflag("h", "help", "print help menu");
let matches = opts
.parse(&env::args().collect::<Vec<_>>()[1..])
.map_err(|e| {
print_usage(&opts);
Error::ParseArgsFailed(e)
})?;
if matches.opt_present("h") {
print_usage(&opts);
process::exit(0);
}
let sound_card_id = matches
.opt_str("id")
.ok_or_else(|| Error::MissingOption("id".to_owned()))
.map_err(|e| {
print_usage(&opts);
e
})?;
Ok(Args { sound_card_id })
}
fn get_config(args: &Args) -> Result<String> {
let config_path = PathBuf::from(CONF_DIR)
.join(&args.sound_card_id)
.with_extension("yaml");
fs::read_to_string(&config_path)
.map_err(|e| Error::OpenConfigFailed(config_path.to_string_lossy().to_string(), e))
}
/// Parses the CONF_DIR/<sound_card_id>.yaml and starts sound card initialization.
fn sound_card_init() -> std::result::Result<(), Box<dyn error::Error>> {
let args = parse_args()?;
info!("sound_card_id: {}", args.sound_card_id);
let conf = get_config(&args)?;
match args.sound_card_id.as_str() {
"sofcmlmax98390d" => {
run_max98390d(&args.sound_card_id, &conf)?;
info!("run_max98390d() finished successfully.");
}
_ => return Err(Error::UnsupportedSoundCard(args.sound_card_id).into()),
};
Ok(())
}
fn main() {
syslog::init().expect("failed to initialize syslog");
if let Err(e) = sound_card_init() {
error!("sound_card_init: {}", e);
}
}
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