power: Expose TDP limit range as platform config

data/platforms/jupiter.toml

@@ -19,3 +19,7 @@ no_validate_flag = "--skip-validation"
 
 [fan_control]
 systemd = "jupiter-fan-control.service"
+
+[tdp_limit]
+min = 3
+max = 15

src/hardware.rs

@@ -369,6 +369,7 @@ pub mod test {
             fan_control: Some(ServiceConfig::Systemd(String::from(
                 "jupiter-fan-control.service",
             ))),
+            tdp_limit: None,
         }));
 
         let fan_control = FanControl::new(connection);

src/manager/user.rs

@@ -27,6 +27,7 @@ use crate::power::{
     get_available_cpu_scaling_governors, get_available_gpu_performance_levels,
     get_available_gpu_power_profiles, get_cpu_scaling_governor, get_gpu_clocks,
     get_gpu_clocks_range, get_gpu_performance_level, get_gpu_power_profile, get_tdp_limit,
+    get_tdp_limit_range,
 };
 use crate::wifi::{get_wifi_backend, get_wifi_power_management_state, list_wifi_interfaces};
 use crate::API_VERSION;
@@ -418,8 +419,8 @@ impl Storage1 {
 #[interface(name = "com.steampowered.SteamOSManager1.TdpLimit1")]
 impl TdpLimit1 {
     #[zbus(property(emits_changed_signal = "false"))]
-    async fn tdp_limit(&self) -> fdo::Result<u32> {
+    async fn tdp_limit(&self) -> u32 {
-        get_tdp_limit().await.map_err(to_zbus_fdo_error)
+        get_tdp_limit().await.unwrap_or(0)
     }
 
     #[zbus(property)]
@@ -429,14 +430,18 @@ impl TdpLimit1 {
 
     #[zbus(property(emits_changed_signal = "const"))]
     async fn tdp_limit_min(&self) -> u32 {
-        // TODO: Can this be queried from somewhere?
+        get_tdp_limit_range()
-        3
+            .await
+            .and_then(|(min, _)| Ok(min))
+            .unwrap_or(0)
     }
 
     #[zbus(property(emits_changed_signal = "const"))]
     async fn tdp_limit_max(&self) -> u32 {
-        // TODO: Can this be queried from somewhere?
+        get_tdp_limit_range()
-        15
+            .await
+            .and_then(|(_, max)| Ok(max))
+            .unwrap_or(0)
     }
 }
 
@@ -661,7 +666,9 @@ mod test {
     use crate::daemon::user::UserContext;
     use crate::hardware::test::fake_model;
     use crate::hardware::HardwareVariant;
-    use crate::platform::{PlatformConfig, ScriptConfig, ServiceConfig, StorageConfig};
+    use crate::platform::{
+        PlatformConfig, RangeConfig, ScriptConfig, ServiceConfig, StorageConfig,
+    };
     use crate::systemd::test::{MockManager, MockUnit};
     use crate::{power, testing};
 
@@ -684,6 +691,7 @@ mod test {
             fan_control: Some(ServiceConfig::Systemd(String::from(
                 "jupiter-fan-control.service",
             ))),
+            tdp_limit: Some(RangeConfig::new(3, 15)),
         })
     }
 

src/platform.rs

@@ -26,8 +26,17 @@ pub(crate) struct PlatformConfig {
     pub update_dock: Option<ScriptConfig>,
     pub storage: Option<StorageConfig>,
     pub fan_control: Option<ServiceConfig>,
+    pub tdp_limit: Option<RangeConfig<u32>>,
 }
 
+#[derive(Clone, Deserialize, Debug)]
+pub(crate) struct RangeConfig<T: Clone> {
+    pub min: T,
+    pub max: T,
+}
+
+impl<T> Copy for RangeConfig<T> where T: Copy {}
+
 #[derive(Clone, Default, Deserialize, Debug)]
 pub(crate) struct ScriptConfig {
     pub script: PathBuf,
@@ -67,6 +76,13 @@ pub(crate) struct FormatDeviceConfig {
     pub no_validate_flag: Option<String>,
 }
 
+impl<T: Clone> RangeConfig<T> {
+    #[allow(unused)]
+    pub(crate) fn new(min: T, max: T) -> RangeConfig<T> {
+        RangeConfig { min, max }
+    }
+}
+
 impl PlatformConfig {
     #[cfg(not(test))]
     async fn load() -> Result<Option<PlatformConfig>> {

src/power.rs

@@ -16,6 +16,7 @@ use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
 use tracing::{error, warn};
 
 use crate::hardware::is_deck;
+use crate::platform::platform_config;
 use crate::{path, write_synced};
 
 const GPU_HWMON_PREFIX: &str = "/sys/class/hwmon";
@@ -397,6 +398,15 @@ pub(crate) async fn set_tdp_limit(limit: u32) -> Result<()> {
     Ok(())
 }
 
+pub(crate) async fn get_tdp_limit_range() -> Result<(u32, u32)> {
+    let range = platform_config()
+        .await?
+        .as_ref()
+        .and_then(|config| config.tdp_limit)
+        .ok_or(anyhow!("No TDP limit range configured"))?;
+    Ok((range.min, range.max))
+}
+
 #[cfg(test)]
 pub(crate) mod test {
     use super::*;