From 54e051b7dfbfde9083ce4becd80718ea642114fd Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Sun, 4 Aug 2019 15:28:37 -0400
Subject: Initial commit.

---
 src/setup.rs | 196 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 196 insertions(+)
 create mode 100644 src/setup.rs

(limited to 'src/setup.rs')

diff --git a/src/setup.rs b/src/setup.rs
new file mode 100644
index 0000000..8fa6414
--- /dev/null
+++ b/src/setup.rs
@@ -0,0 +1,196 @@
+use core::convert::{TryFrom, TryInto};
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[repr(C)]
+pub struct RequestType(u8);
+impl RequestType {
+    pub fn recipient(&self) -> Result<RequestRecipient, &'static str> {
+        const POS: u8 = 0;
+        const MASK: u8 = 0x1f;
+        (self.0 & (MASK << POS)).try_into()
+    }
+
+    pub fn set_recipient(&mut self, v: RequestRecipient) {
+        const POS: u8 = 0;
+        const MASK: u8 = 0x1f;
+        self.0 &= !(MASK << POS);
+        self.0 |= v as u8 & MASK;
+    }
+
+    pub fn kind(&self) -> Result<RequestKind, &'static str> {
+        const POS: u8 = 5;
+        const MASK: u8 = 0x3;
+        (self.0 & (MASK << POS)).try_into()
+    }
+
+    pub fn set_kind(&mut self, v: RequestKind) {
+        const POS: u8 = 5;
+        const MASK: u8 = 0x3;
+        self.0 &= !(MASK << POS);
+        self.0 |= v as u8 & MASK;
+    }
+
+    pub fn direction(&self) -> Result<RequestDirection, &'static str> {
+        const POS: u8 = 7;
+        const MASK: u8 = 0x1;
+        (self.0 & (MASK << POS)).try_into()
+    }
+
+    pub fn set_direction(&mut self, v: RequestDirection) {
+        const POS: u8 = 7;
+        const MASK: u8 = 0x1;
+        self.0 &= !(MASK << POS);
+        self.0 |= v as u8 & MASK;
+    }
+}
+impl From<(RequestDirection, RequestKind, RequestRecipient)> for RequestType {
+    fn from(v: (RequestDirection, RequestKind, RequestRecipient)) -> Self {
+        Self(v.0 as u8 | v.1 as u8 | v.2 as u8)
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum RequestDirection {
+    HostToDevice = 0x00,
+    DeviceToHost = 0x80,
+}
+impl TryFrom<u8> for RequestDirection {
+    type Error = &'static str;
+
+    fn try_from(v: u8) -> Result<Self, Self::Error> {
+        match v {
+            0x00 => Ok(Self::HostToDevice),
+            0x80 => Ok(Self::DeviceToHost),
+            _ => Err("direction can only be 0x00 or 0x80"),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum RequestKind {
+    Standard = 0x00,
+    Class = 0x20,
+    Vendor = 0x40,
+}
+impl TryFrom<u8> for RequestKind {
+    type Error = &'static str;
+
+    fn try_from(v: u8) -> Result<Self, Self::Error> {
+        match v {
+            0x00 => Ok(Self::Standard),
+            0x20 => Ok(Self::Class),
+            0x40 => Ok(Self::Vendor),
+            _ => Err("type can only be 0x00, 0x20, or 0x40"),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum RequestRecipient {
+    Device = 0x00,
+    Interface = 0x01,
+    Endpoint = 0x02,
+    Other = 0x03,
+}
+impl TryFrom<u8> for RequestRecipient {
+    type Error = &'static str;
+
+    fn try_from(v: u8) -> Result<Self, Self::Error> {
+        match v {
+            0x00 => Ok(Self::Device),
+            0x01 => Ok(Self::Interface),
+            0x02 => Ok(Self::Endpoint),
+            0x03 => Ok(Self::Other),
+            _ => Err("recipient can only be between 0 and 3"),
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+#[repr(C)]
+pub struct WValue(u16);
+impl WValue {
+    pub fn w_value_lo(&self) -> u8 {
+        const POS: u8 = 0;
+        const MASK: u16 = 0xff;
+        ((self.0 >> POS) & MASK) as u8
+    }
+
+    pub fn set_w_value_lo(&mut self, v: u8) {
+        const POS: u8 = 0;
+        const MASK: u8 = 0xff;
+        self.0 &= !((MASK as u16) << POS);
+        self.0 |= ((v & MASK) as u16) << POS;
+    }
+
+    pub fn w_value_hi(&self) -> u8 {
+        const POS: u8 = 8;
+        const MASK: u16 = 0xff;
+        ((self.0 >> POS) & MASK) as u8
+    }
+
+    pub fn set_w_value_hi(&mut self, v: u8) {
+        const POS: u8 = 8;
+        const MASK: u8 = 0xff;
+        self.0 &= !((MASK as u16) << POS);
+        self.0 |= ((v & MASK) as u16) << POS;
+    }
+}
+impl From<(u8, u8)> for WValue {
+    fn from(v: (u8, u8)) -> Self {
+        let mut rc = Self(0);
+        rc.set_w_value_lo(v.0);
+        rc.set_w_value_hi(v.1);
+        rc
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum RequestCode {
+    GetStatus = 0,
+    ClearFeature = 1,
+    SetFeature = 3,
+    SetAddress = 5,
+    GetDescriptor = 6,
+    SetDescriptor = 7,
+    GetConfiguration = 8,
+    SetConfiguration = 9,
+    GetInterface = 10,
+    SetInterface = 11,
+    SynchFrame = 12,
+}
+impl TryFrom<u8> for RequestCode {
+    type Error = &'static str;
+
+    fn try_from(v: u8) -> Result<Self, Self::Error> {
+        match v {
+            0 => Ok(Self::GetStatus),
+            1 => Ok(Self::ClearFeature),
+            3 => Ok(Self::SetFeature),
+            5 => Ok(Self::SetAddress),
+            6 => Ok(Self::GetDescriptor),
+            7 => Ok(Self::SetDescriptor),
+            8 => Ok(Self::GetConfiguration),
+            9 => Ok(Self::SetConfiguration),
+            10 => Ok(Self::GetInterface),
+            11 => Ok(Self::SetInterface),
+            12 => Ok(Self::SynchFrame),
+            _ => Err("invalid request value"),
+        }
+    }
+}
+impl Default for RequestCode {
+    fn default() -> Self {
+        Self::GetStatus
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+#[repr(C, packed)]
+pub struct SetupPacket {
+    pub bm_request_type: RequestType,
+    pub b_request: RequestCode,
+    pub w_value: WValue,
+    pub w_index: u16,
+    pub w_length: u16,
+}
-- 
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