Reorganize access module and make it public

Author: phil-opp

src/access.rs

@@ -1,13 +1,13 @@
 pub trait Readable {}
 pub trait Writable {}
 
-pub struct Read;
-
-impl Readable for Read {}
-
-pub struct Write;
-impl Writable for Write {}
-
 pub struct ReadWrite;
 impl Readable for ReadWrite {}
 impl Writable for ReadWrite {}
+
+pub struct ReadOnly;
+
+impl Readable for ReadOnly {}
+
+pub struct WriteOnly;
+impl Writable for WriteOnly {}

src/lib.rs

@@ -9,15 +9,16 @@
 
 #![no_std]
 
-pub use crate::access::{ReadWrite, Readable, Writable};
+use access::{ReadOnly, ReadWrite, Readable, Writable, WriteOnly};
 use core::{
     marker::PhantomData,
     ops::{Index, IndexMut},
     ptr,
     slice::SliceIndex,
 };
 
-mod access;
+/// Allows creating read-only and write-only `Volatile` values.
+pub mod access;
 
 /// A wrapper type around a reference to a volatile variable.
 ///