feat: zero RPM settings (#11)

* feat: add fan zero rpm functionality

* feat: new zero rpm controls

src/gpu_handle/mod.rs

@@ -439,6 +439,29 @@ impl GpuHandle {
         self.read_fan_info("fan_minimum_pwm", "FAN_MINIMUM_PWM", "MINIMUM_PWM")
     }
 
+    /// Gets the current fan zero RPM mode.
+    ///
+    /// Only available on Navi3x (RDNA 3) or newer.
+    pub fn get_fan_zero_rpm_enable(&self) -> Result<bool> {
+        self.read_fan_info(
+            "fan_zero_rpm_enable",
+            "FAN_ZERO_RPM_ENABLE",
+            "ZERO_RPM_ENABLE",
+        )
+        .map(|info| info.current == 1)
+    }
+
+    /// Gets the current fan zero RPM stop temperature.
+    ///
+    /// Only available on Navi3x (RDNA 3) or newer.
+    pub fn get_fan_zero_rpm_stop_temperature(&self) -> Result<FanInfo> {
+        self.read_fan_info(
+            "fan_zero_rpm_stop_temperature",
+            "FAN_ZERO_RPM_STOP_TEMPERATURE",
+            "ZERO_RPM_STOP_TEMPERATURE",
+        )
+    }
+
     fn set_fan_value(
         &self,
         file: &str,
@@ -508,11 +531,34 @@ impl GpuHandle {
     /// Sets the fan minimum PWM. Value is a percentage.
     ///
     /// Only available on Navi3x (RDNA 3) or newer.
-    /// <https://kernel.org/doc/html/latest/gpu/amdgpu/thermal.html#fan-minimum-pwm>
     pub fn set_fan_minimum_pwm(&self, value: u32) -> Result<CommitHandle> {
         self.set_fan_value("fan_minimum_pwm", value, "FAN_MINIMUM_PWM", "MINIMUM_PWM")
     }
 
+    /// Sets the current fan zero RPM mode.
+    ///
+    /// Only available on Navi3x (RDNA 3) or newer.
+    pub fn set_fan_zero_rpm_enable(&self, enabled: bool) -> Result<CommitHandle> {
+        self.set_fan_value(
+            "fan_zero_rpm_enable",
+            enabled as u32,
+            "FAN_ZERO_RPM_ENABLE",
+            "ZERO_RPM_ENABLE",
+        )
+    }
+
+    /// Sets the fan zero RPM stop temperature.
+    ///
+    /// Only available on Navi3x (RDNA 3) or newer.
+    pub fn set_fan_zero_rpm_stop_temperature(&self, value: u32) -> Result<CommitHandle> {
+        self.set_fan_value(
+            "fan_zero_rpm_stop_temperature",
+            value,
+            "FAN_ZERO_RPM_STOP_TEMPERATURE",
+            "ZERO_RPM_STOP_TEMPERATURE",
+        )
+    }
+
     fn reset_fan_value(&self, file: &str) -> Result<()> {
         let file_path = self.sysfs_path.join("gpu_od/fan_ctrl").join(file);
         let mut file = File::create(file_path)?;

tests/data/rx7800xt/gpu_od/fan_ctrl/fan_zero_rpm_enable

@@ -0,0 +1,4 @@
+FAN_ZERO_RPM_ENABLE:
+0
+OD_RANGE:
+ZERO_RPM_ENABLE: 0 1

tests/rx7800xt.rs

@@ -26,5 +26,9 @@ test_with_handle! {
     get_fan_curve => {
         GpuHandle::get_fan_curve,
         Ok(FanCurve { points: vec![(0, 0); 5].into_boxed_slice(), allowed_ranges: Some(FanCurveRanges {temperature_range: 25..=100, speed_range: 20..=100 })})
+    },
+    get_fan_zero_rpm => {
+        GpuHandle::get_fan_zero_rpm_enable,
+        Ok(false),
     }
 }