hid: Add support for {Get,Set}_Report requests

This patch adds support for Get_Report and Set_Report requests to
HidClass.  We parse the request metadata and the delegate the request
handling to the HidDevice.

Our HidDevice implementation, Nitrokey, stores the data sent with
Set_Report requests.  The Get_Report handling is not implemented yet.

1 files changed, 27 insertions, 3 deletions

diff --git a/src/device.rs b/src/device.rs
index f71caf0..f7c4fc7 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -4,11 +4,12 @@
 use usb_device::bus::{UsbBus, UsbBusAllocator};
 use usb_device::device::{UsbDevice, UsbDeviceBuilder, UsbVidPid};
 
-use crate::hid::{HidDevice, Protocol, Subclass};
+use crate::hid::{HidDevice, Protocol, ReportType, Subclass};
 
 const VID_CLAY_LOGIC: u16 = 0x20a0;
 const PID_NITROKEY_PRO: u16 = 0x4108;
 
+const REPORT_LEN: usize = 64;
 const REPORT_DESCRIPTOR: &[u8] = &[
     0x05, 0x01, 0x09, 0x06, 0xA1, 0x01, 0x05, 0x07, 0x19, 0xE0, 0x29, 0xE7, 0x15, 0x00, 0x25, 0x01,
     0x75, 0x01, 0x95, 0x08, 0x81, 0x02, 0x95, 0x01, 0x75, 0x08, 0x81, 0x03, 0x95, 0x05, 0x75, 0x01,
@@ -17,11 +18,15 @@ const REPORT_DESCRIPTOR: &[u8] = &[
     0x75, 0x08, 0x95, 0x40, 0xB1, 0x02, 0xC0,
 ];
 
-pub struct Nitrokey {}
+pub struct Nitrokey {
+    buf: [u8; REPORT_LEN],
+}
 
 impl Nitrokey {
     pub fn new() -> Self {
-        Nitrokey {}
+        Nitrokey {
+            buf: [0; REPORT_LEN],
+        }
     }
 }
 
@@ -37,6 +42,25 @@ impl HidDevice for Nitrokey {
     fn report_descriptor(&self) -> &[u8] {
         REPORT_DESCRIPTOR
     }
+
+    fn get_report(&mut self, report_type: ReportType, report_id: u8) -> Result<&[u8], ()> {
+        let _ = (report_type, report_id);
+        Err(())
+    }
+
+    fn set_report(
+        &mut self,
+        report_type: ReportType,
+        report_id: u8,
+        data: &[u8],
+    ) -> Result<(), ()> {
+        if report_type != ReportType::Feature || report_id != 0 || data.len() != REPORT_LEN {
+            Err(())
+        } else {
+            self.buf.copy_from_slice(data);
+            Ok(())
+        }
+    }
 }
 
 pub fn create_usb_device<B: UsbBus>(alloc: &UsbBusAllocator<B>) -> UsbDevice<'_, B> {