screenreader: Use uinput to send keyboard events.

Orca has no API, so use keyboard events to trigger specific actions
like sticking to focus mode, browse mode, etc.
Also add new get and set methods to steamosctl for mode.

src/manager/user.rs

@@ -31,7 +31,7 @@ use crate::power::{
     get_gpu_clocks, get_gpu_clocks_range, get_gpu_performance_level, get_gpu_power_profile,
     get_max_charge_level, get_platform_profile, TdpManagerCommand,
 };
-use crate::screenreader::OrcaManager;
+use crate::screenreader::{OrcaManager, ScreenReaderMode};
 use crate::wifi::{
     get_wifi_backend, get_wifi_power_management_state, list_wifi_interfaces, WifiBackend,
 };
@@ -685,6 +685,28 @@ impl ScreenReader0 {
             .await
             .map_err(to_zbus_fdo_error)
     }
+
+    #[zbus(property)]
+    async fn mode(&self) -> u32 {
+        self.screen_reader.mode() as u32
+    }
+
+    #[zbus(property)]
+    async fn set_mode(
+        &mut self,
+        m: u32,
+        #[zbus(signal_emitter)] ctx: SignalEmitter<'_>,
+    ) -> fdo::Result<()> {
+        let mode = match ScreenReaderMode::try_from(m) {
+            Ok(mode) => mode,
+            Err(err) => return Err(fdo::Error::InvalidArgs(err.to_string())),
+        };
+        self.screen_reader
+            .set_mode(mode)
+            .await
+            .map_err(to_zbus_fdo_error)?;
+        self.mode_changed(&ctx).await.map_err(to_zbus_fdo_error)
+    }
 }
 
 #[interface(name = "com.steampowered.SteamOSManager1.Storage1")]