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usb: builtin handling of interface alternate settings

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The stack reads its own descriptors to figure out which endpoints
are used in which alt settings, and enables/disables them as needed.

The ControlHandler has a callback so it can get notified of alternate
setting changes, which is purely informative (it doesn't have to do anything).
This commit is contained in:
Dario Nieuwenhuis
2022-04-16 04:47:27 +02:00
parent ea0a701ebd
commit 092c2b7dfe
9 changed files with 357 additions and 146 deletions
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21
embassy-usb-hid/src/lib.rs
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@ -438,6 +438,14 @@ impl<'d> ControlHandler for Control<'d> {
self.out_report_offset.store(0, Ordering::Release);
}
fn get_descriptor<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
match (req.value >> 8) as u8 {
HID_DESC_DESCTYPE_HID_REPORT => InResponse::Accepted(self.report_descriptor),
HID_DESC_DESCTYPE_HID => InResponse::Accepted(&self.hid_descriptor),
_ => InResponse::Rejected,
}
}
fn control_out(&mut self, req: embassy_usb::control::Request, data: &[u8]) -> OutResponse {
trace!("HID control_out {:?} {=[u8]:x}", req, data);
if let RequestType::Class = req.request_type {
@ -477,13 +485,8 @@ impl<'d> ControlHandler for Control<'d> {
fn control_in<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
trace!("HID control_in {:?}", req);
match (req.request_type, req.request) {
(RequestType::Standard, Request::GET_DESCRIPTOR) => match (req.value >> 8) as u8 {
HID_DESC_DESCTYPE_HID_REPORT => InResponse::Accepted(self.report_descriptor),
HID_DESC_DESCTYPE_HID => InResponse::Accepted(&self.hid_descriptor),
_ => InResponse::Rejected,
},
(RequestType::Class, HID_REQ_GET_REPORT) => {
match req.request {
HID_REQ_GET_REPORT => {
let size = match ReportId::try_from(req.value) {
Ok(id) => self.request_handler.and_then(|x| x.get_report(id, buf)),
Err(_) => None,
@ -495,7 +498,7 @@ impl<'d> ControlHandler for Control<'d> {
InResponse::Rejected
}
}
(RequestType::Class, HID_REQ_GET_IDLE) => {
HID_REQ_GET_IDLE => {
if let Some(handler) = self.request_handler {
let id = req.value as u8;
let id = (id != 0).then(|| ReportId::In(id));
@ -510,7 +513,7 @@ impl<'d> ControlHandler for Control<'d> {
InResponse::Rejected
}
}
(RequestType::Class, HID_REQ_GET_PROTOCOL) => {
HID_REQ_GET_PROTOCOL => {
// UNSUPPORTED: Boot Protocol
buf[0] = 1;
InResponse::Accepted(&buf[0..1])