Add ability to set BAT0/charge_control_end_threshold

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add support for G531GT
 - Remove duplicated code: it looks like there is at least *some* consistency in Consumer-Device keycodes that ASUS uses
 
+### BREAKING CHANGE
+- `bat_charge_limit = 100` must be appended to the top of `/etc/rogcore.conf`
+
 ## [0.11.1] - 2020-11-06
 ### Changed
 - Use DBUS_NAME instead of DBUS_IFACE when requesting the name

rog-core/src/config.rs

@@ -8,6 +8,7 @@ pub static CONFIG_PATH: &str = "/etc/rogcore.conf";
 #[derive(Default, Deserialize, Serialize)]
 pub struct Config {
     pub fan_mode: u8,
+    pub bat_charge_limit: u8,
     pub brightness: u8,
     pub current_mode: [u8; 4],
     pub builtin_modes: BuiltInModeBytes,
@@ -29,6 +30,7 @@ impl Config {
             if l == 0 {
                 // create a default config here
                 let mut c = Config::default();
+                c.bat_charge_limit = 100;
                 c.current_mode[0] = 0x5d;
                 c.current_mode[1] = 0xb3;
                 // Should be okay to unwrap this as is since it is a Default

rog-core/src/daemon.rs

@@ -51,8 +51,11 @@ pub async fn start_daemon() -> Result<(), Box<dyn Error>> {
     // Reload settings
     rogcore
         .fan_mode_reload(&mut config)
-        .await
         .unwrap_or_else(|err| warn!("Fan mode: {}", err));
+    rogcore
+        .bat_charge_limit_reload(&mut config)
+        .unwrap_or_else(|err| warn!("Battery charge limit: {}", err));
+
     let mut led_writer = LedWriter::new(
         rogcore.get_raw_device_handle(),
         laptop.led_endpoint(),

rog-core/src/rogcore.rs

@@ -16,6 +16,7 @@ use std::time::Duration;
 static FAN_TYPE_1_PATH: &str = "/sys/devices/platform/asus-nb-wmi/throttle_thermal_policy";
 static FAN_TYPE_2_PATH: &str = "/sys/devices/platform/asus-nb-wmi/fan_boost_mode";
 static AMD_BOOST_PATH: &str = "/sys/devices/system/cpu/cpufreq/boost";
+static BAT_CHARGE_PATH: &str = "/sys/class/power_supply/BAT0/charge_control_end_threshold";
 
 /// ROG device controller
 ///
@@ -128,7 +129,7 @@ impl RogCore {
         }
     }
 
-    pub async fn fan_mode_reload(&mut self, config: &mut Config) -> Result<(), Box<dyn Error>> {
+    pub fn fan_mode_reload(&mut self, config: &mut Config) -> Result<(), Box<dyn Error>> {
         let path = RogCore::get_fan_path()?;
         let mut file = OpenOptions::new().write(true).open(path)?;
         file.write_all(format!("{:?}\n", config.fan_mode).as_bytes())
@@ -258,6 +259,37 @@ impl RogCore {
         Ok(())
     }
 
+    pub fn bat_charge_limit_reload(&self, config: &mut Config) -> Result<(), Box<dyn Error>> {
+        config.read();
+        info!("Reloaded battery charge limit");
+        self.set_charge_limit(config.bat_charge_limit, config)
+    }
+
+    pub fn set_charge_limit(&self, limit: u8, config: &mut Config) -> Result<(), Box<dyn Error>> {
+        if limit < 20 || limit > 100 {
+            warn!(
+                "Unable to set battery charge limit, must be between 20-100: requested {}",
+                limit
+            );
+        }
+
+        let mut file = OpenOptions::new()
+            .write(true)
+            .open(BAT_CHARGE_PATH)
+            .map_err(|err| {
+                warn!("Failed to open battery charge limit path: {:?}", err);
+                err
+            })?;
+        file.write_all(limit.to_string().as_bytes())
+            .unwrap_or_else(|err| error!("Could not write to {}, {:?}", BAT_CHARGE_PATH, err));
+        info!("Battery charge limit: {}", limit);
+
+        config.bat_charge_limit = limit;
+        config.write();
+
+        Ok(())
+    }
+
     /// A direct call to systemd to suspend the PC.
     ///
     /// This avoids desktop environments being required to handle it