1 files changed, 90 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100755
index 0000000..551824a
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,90 @@
+#![no_std]
+
+mod descriptor;
+mod setup;
+
+pub use descriptor::*;
+pub use setup::*;
+
+#[derive(Debug)]
+pub enum TransferError {
+    Retry(&'static str),
+    Permanent(&'static str),
+}
+
+pub trait USBHost {
+    fn control_transfer(
+        &mut self,
+        ep: &mut dyn Endpoint,
+        bm_request_type: RequestType,
+        b_request: RequestCode,
+        w_value: WValue,
+        w_index: u16,
+        buf: Option<&mut [u8]>,
+    ) -> Result<usize, TransferError>;
+
+    fn in_transfer(
+        &mut self,
+        ep: &mut dyn Endpoint,
+        buf: &mut [u8],
+    ) -> Result<usize, TransferError>;
+
+    fn out_transfer(&mut self, ep: &mut dyn Endpoint, buf: &[u8]) -> Result<usize, TransferError>;
+}
+
+// cf §9.6.6 of USB 2.0
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum TransferType {
+    Control = 0,
+    Isochronous = 1,
+    Bulk = 2,
+    Interrupt = 3,
+}
+
+// ibid
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum Direction {
+    Out,
+    In,
+}
+
+pub trait Endpoint {
+    fn address(&self) -> u8;
+
+    fn endpoint_num(&self) -> u8;
+
+    fn transfer_type(&self) -> TransferType;
+
+    fn direction(&self) -> Direction;
+
+    fn max_packet_size(&self) -> u16;
+
+    fn in_toggle(&self) -> bool;
+
+    fn set_in_toggle(&mut self, toggle: bool);
+
+    fn out_toggle(&self) -> bool;
+
+    fn set_out_toggle(&mut self, toggle: bool);
+}
+
+#[derive(Copy, Clone, Debug)]
+pub enum DriverError {
+    Retry(u8, &'static str),
+    Permanent(u8, &'static str),
+}
+pub trait Driver: core::fmt::Debug {
+    fn want_device(&self, device: &DeviceDescriptor) -> bool;
+
+    fn add_device(&mut self, device: DeviceDescriptor, address: u8) -> Result<(), DriverError>;
+
+    fn remove_device(&mut self, address: u8);
+
+    fn tick(&mut self, millis: usize, usbhost: &mut dyn USBHost) -> Result<(), DriverError>;
+}
+
+// TODO: There needs to be a per-interface/function driver trait, as
+// well, since that's how most drivers will actually work.
+//
+// As a result, the host driver has to at least get the full
+// configuration.