rust/kernel: Add faux device bindings

This introduces a module for working with faux devices in rust, along with
adding sample code to show how the API is used. Unlike other types of
devices, we don't provide any hooks for device probe/removal - since these
are optional for the faux API and are unnecessary in rust.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Maíra Canal <mairacanal@riseup.net>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/2025021026-exert-accent-b4c6@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/samples/rust/rust_driver_faux.rs b/samples/rust/rust_driver_faux.rs
new file mode 100644
index 000000000000..048c6cb98b29
--- /dev/null
+++ b/samples/rust/rust_driver_faux.rs
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+//! Rust faux device sample.
+
+use kernel::{c_str, faux, prelude::*, Module};
+
+module! {
+    type: SampleModule,
+    name: "rust_faux_driver",
+    author: "Lyude Paul",
+    description: "Rust faux device sample",
+    license: "GPL",
+}
+
+struct SampleModule {
+    _reg: faux::Registration,
+}
+
+impl Module for SampleModule {
+    fn init(_module: &'static ThisModule) -> Result<Self> {
+        pr_info!("Initialising Rust Faux Device Sample\n");
+
+        let reg = faux::Registration::new(c_str!("rust-faux-sample-device"))?;
+
+        dev_info!(reg.as_ref(), "Hello from faux device!\n");
+
+        Ok(Self { _reg: reg })
+    }
+}