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-rw-r--r--src/hid.rs32
-rw-r--r--src/main.rs3
-rw-r--r--src/util.rs43
3 files changed, 57 insertions, 21 deletions
diff --git a/src/hid.rs b/src/hid.rs
index 4f1d506..6274e7f 100644
--- a/src/hid.rs
+++ b/src/hid.rs
@@ -11,30 +11,20 @@ use usb_device::Result;
const INTERFACE_CLASS_HID: u8 = 0x03;
-#[derive(Clone, Copy, Debug, PartialEq)]
-#[repr(u8)]
-pub enum Subclass {
- None = 0x00,
- BootInterface = 0x01,
-}
-
-impl From<Subclass> for u8 {
- fn from(subclass: Subclass) -> u8 {
- subclass as u8
+enum_u8! {
+ #[derive(Clone, Copy, Debug, PartialEq)]
+ pub enum Subclass {
+ None = 0x00,
+ BootInterface = 0x01,
}
}
-#[derive(Clone, Copy, Debug, PartialEq)]
-#[repr(u8)]
-pub enum Protocol {
- None = 0x00,
- Keyboard = 0x01,
- Mouse = 0x02,
-}
-
-impl From<Protocol> for u8 {
- fn from(protocol: Protocol) -> u8 {
- protocol as u8
+enum_u8! {
+ #[derive(Clone, Copy, Debug, PartialEq)]
+ pub enum Protocol {
+ None = 0x00,
+ Keyboard = 0x01,
+ Mouse = 0x02,
}
}
diff --git a/src/main.rs b/src/main.rs
index b0ecafd..3857967 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,6 +6,9 @@
extern crate panic_halt;
+#[macro_use]
+mod util;
+
mod device;
mod hid;
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..4fc4448
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,43 @@
+// Copyright 2019 Robin Krahl <robin.krahl@ireas.org>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use core::marker::Sized;
+
+macro_rules! enum_u8 {
+ (
+ $(#[$outer:meta])*
+ pub enum $name:ident {
+ $($var:ident = $num:expr),+
+ $(,)*
+ }
+ ) => {
+ $(#[$outer])*
+ #[repr(u8)]
+ pub enum $name {
+ $(
+ $var = $num,
+ )*
+ }
+
+ impl crate::util::TryFrom<u8> for $name {
+ fn try_from(val: u8) -> ::core::result::Result<Self, ()> {
+ match val {
+ $(
+ $num => Ok($name::$var),
+ )*
+ _ => Err(())
+ }
+ }
+ }
+
+ impl From<$name> for u8 {
+ fn from(val: $name) -> u8 {
+ val as u8
+ }
+ }
+ };
+}
+
+pub trait TryFrom<T>: Sized {
+ fn try_from(val: T) -> Result<Self, ()>;
+}