Add SPI abstraction in Rust

rust/kernel/bindings_helper.h

@@ -11,6 +11,7 @@
 #include <linux/miscdevice.h>
 #include <linux/poll.h>
 #include <linux/mm.h>
+#include <linux/spi/spi.h>
 #include <uapi/linux/android/binder.h>
 
 // `bindgen` gets confused at certain things

rust/kernel/lib.rs

@@ -65,6 +65,9 @@ pub mod user_ptr;
 pub use crate::error::{Error, KernelResult};
 pub use crate::types::{CStr, Mode};
 
+#[cfg(CONFIG_SPI)]
+pub mod spi;
+
 /// Page size defined in terms of the `PAGE_SHIFT` macro from C.
 ///
 /// [`PAGE_SHIFT`]: ../../../include/asm-generic/page.h

rust/kernel/spi.rs

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+
+use crate::bindings;
+use crate::c_types;
+use crate::error::{Error, KernelResult};
+
+pub struct Registration {
+    this_module: &'static crate::ThisModule,
+    spi_driver: bindings::spi_driver,
+    prout
+}
+
+impl Registration {
+    pub fn new(this_module: &'static crate::ThisModule,
+               spi_driver: bindings::spi_driver
+               ) -> Self {
+        Registration {
+            this_module,
+            spi_driver
+        }
+    }
+
+    pub fn register(&mut self) -> KernelResult {
+        let res = unsafe { bindings::__spi_register_driver(self.this_module.0, &mut self.spi_driver as
+                                                            *mut bindings::spi_driver) };
+
+        if res != 0 {
+            return Err(Error::from_kernel_errno(res));
+        }
+
+        Ok(())
+    }
+}