Fix the handling of of the kernel change from "quiet" to "low-power"

A coming kernel change will convert "quiet" to "low-power" due to how
platform_profile can now have multiple registered handlers.
(kernel 6.14 est)

Fixes #609

rog-platform/src/lib.rs

@@ -15,6 +15,7 @@ use std::path::Path;
 
 use error::{PlatformError, Result};
 use log::warn;
+use platform::PlatformProfile;
 use udev::Device;
 
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");
@@ -107,6 +108,18 @@ pub fn write_attr_string(device: &mut Device, attr: &str, value: &str) -> Result
         .map_err(|e| PlatformError::IoPath(attr.into(), e))
 }
 
+pub fn read_attr_string_array(device: &Device, attr_name: &str) -> Result<Vec<PlatformProfile>> {
+    if let Some(value) = device.attribute_value(attr_name) {
+        let tmp: Vec<PlatformProfile> = value
+            .to_string_lossy()
+            .split(' ')
+            .map(PlatformProfile::from)
+            .collect();
+        return Ok(tmp);
+    }
+    Err(PlatformError::AttrNotFound(attr_name.to_owned()))
+}
+
 #[cfg(test)]
 mod tests {
     #[test]