rog-platform: add power (basics)

- Refactor the macros
- Add inotify creator for each attribute

rog-platform/src/power.rs

@@ -0,0 +1,62 @@
+use std::path::PathBuf;
+
+use log::warn;
+
+use crate::{
+    attr_u8,
+    error::{PlatformError, Result},
+    to_device,
+};
+
+/// The "platform" device provides access to things like:
+/// - dgpu_disable
+/// - egpu_enable
+/// - panel_od
+/// - dgpu_only
+/// - keyboard_mode, set keyboard RGB mode and speed
+/// - keyboard_state, set keyboard power states
+#[derive(Debug, PartialEq, PartialOrd, Clone)]
+pub struct AsusPower {
+    mains: PathBuf,
+    battery: PathBuf,
+    usb: Option<PathBuf>,
+}
+
+impl AsusPower {
+    pub fn new() -> Result<Self> {
+        let mut mains = PathBuf::new();
+        let mut battery = PathBuf::new();
+        let mut usb = None;
+
+        let mut enumerator = udev::Enumerator::new().map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("enumerator failed".into(), err)
+        })?;
+        enumerator.match_subsystem("power_supply").map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("match_subsystem failed".into(), err)
+        })?;
+
+        for device in enumerator.scan_devices().map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("scan_devices failed".into(), err)
+        })? {
+            if let Some(attr) = device.attribute_value("type") {
+                match attr.to_os_string().as_os_str().to_str() {
+                    Some("Mains") => mains = device.syspath().to_path_buf(),
+                    Some("Battery") => battery = device.syspath().to_path_buf(),
+                    Some("USB") => usb = Some(device.syspath().to_path_buf()),
+                    _ => {}
+                };
+            }
+        }
+
+        Ok(Self {
+            mains,
+            battery,
+            usb,
+        })
+    }
+
+    attr_u8!("charge_control_end_threshold", battery);
+}