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Discover battery from sysfs #185

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Discover battery from sysfs #185

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25 changes: 9 additions & 16 deletions src/battery/kobo.rs
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Original file line number Diff line number Diff line change
@@ -1,12 +1,9 @@
use std::env;
use std::fs::File;
use std::path::Path;
use std::fs::{File, read_dir, read_to_string};
use std::io::{Read, Seek, SeekFrom};
use super::{Battery, Status};
use anyhow::{Error, format_err};

const BATTERY_INTERFACE_A: &str = "/sys/class/power_supply/mc13892_bat";
const BATTERY_INTERFACE_B: &str = "/sys/class/power_supply/battery";
const BATTERY_INTERFACE: &str = "/sys/class/power_supply";

const BATTERY_CAPACITY: &str = "capacity";
const BATTERY_STATUS: &str = "status";
Expand All @@ -19,17 +16,13 @@ pub struct KoboBattery {

impl KoboBattery {
pub fn new() -> Result<KoboBattery, Error> {
let mut firmware_version = [0u16; 3];
env::var("FIRMWARE_VERSION").ok()
.map(|s| s.split('.')
.filter_map(|v| v.parse::<u16>().ok())
.zip(firmware_version.iter_mut())
.for_each(|(a, b)| *b = a));
let base = if firmware_version < [4, 28, 17623] {
Path::new(BATTERY_INTERFACE_A)
} else {
Path::new(BATTERY_INTERFACE_B)
};
let base = read_dir(BATTERY_INTERFACE)?
.filter_map(Result::ok)
.map(|dir| dir.path())
.find(|path| {
let kind = read_to_string(path.join("type")).unwrap_or_default();
kind.trim_end() == "Battery"
}).expect("Could not find battery");
let capacity = File::open(base.join(BATTERY_CAPACITY))?;
let status = File::open(base.join(BATTERY_STATUS))?;
Ok(KoboBattery { capacity, status })
Expand Down