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usb: simplify control in/out handlng, calling response from a single place.

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This commit is contained in:
Dario Nieuwenhuis 2022-05-09 02:11:02 +02:00
parent 2e104170de
commit 7ed462a657
4 changed files with 158 additions and 156 deletions
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14
embassy-usb-ncm/src/lib.rs
View file

@ -133,6 +133,7 @@ impl Default for ControlShared {
struct CommControl<'a> {
mac_addr_string: StringIndex,
shared: &'a ControlShared,
mac_addr_str: [u8; 12],
}
impl<'d> ControlHandler for CommControl<'d> {
@ -178,24 +179,20 @@ impl<'d> ControlHandler for CommControl<'d> {
}
}
fn get_string<'a>(
&'a mut self,
index: StringIndex,
_lang_id: u16,
buf: &'a mut [u8],
) -> Option<&'a str> {
fn get_string(&mut self, index: StringIndex, _lang_id: u16) -> Option<&str> {
if index == self.mac_addr_string {
let mac_addr = self.shared.mac_addr.get();
let s = &mut self.mac_addr_str;
for i in 0..12 {
let n = (mac_addr[i / 2] >> ((1 - i % 2) * 4)) & 0xF;
buf[i] = match n {
s[i] = match n {
0x0..=0x9 => b'0' + n,
0xA..=0xF => b'A' + n - 0xA,
_ => unreachable!(),
}
}
Some(unsafe { core::str::from_utf8_unchecked(&buf[..12]) })
Some(unsafe { core::str::from_utf8_unchecked(s) })
} else {
warn!("unknown string index requested");
None
@ -244,6 +241,7 @@ impl<'d, D: Driver<'d>> CdcNcmClass<'d, D> {
iface.handler(state.comm_control.write(CommControl {
mac_addr_string,
shared: &control_shared,
mac_addr_str: [0; 12],
}));
let comm_if = iface.interface_number();
let mut alt = iface.alt_setting(USB_CLASS_CDC, CDC_SUBCLASS_NCM, CDC_PROTOCOL_NONE);

29
embassy-usb/src/control.rs
View file

@ -1,9 +1,7 @@
use core::mem;
use crate::descriptor::DescriptorWriter;
use crate::driver::{self, EndpointError};
use super::types::*;
use crate::driver::{self, EndpointError};
/// Control request type.
#[repr(u8)]
@ -191,16 +189,8 @@ pub trait ControlHandler {
}
/// Called when a GET_DESCRIPTOR STRING control request is received.
///
/// Write the response string somewhere (usually to `buf`, but you may use another buffer
/// owned by yourself, or a static buffer), then return it.
fn get_string<'a>(
&'a mut self,
index: StringIndex,
lang_id: u16,
buf: &'a mut [u8],
) -> Option<&'a str> {
let _ = (index, lang_id, buf);
fn get_string(&mut self, index: StringIndex, lang_id: u16) -> Option<&str> {
let _ = (index, lang_id);
None
}
}
@ -316,19 +306,6 @@ impl<C: driver::ControlPipe> ControlPipe<C> {
}
}
pub(crate) async fn accept_in_writer(
&mut self,
req: Request,
stage: DataInStage,
f: impl FnOnce(&mut DescriptorWriter),
) {
let mut buf = [0; 256];
let mut w = DescriptorWriter::new(&mut buf);
f(&mut w);
let pos = w.position().min(usize::from(req.length));
self.accept_in(&buf[..pos], stage).await
}
pub(crate) fn accept(&mut self, _: StatusStage) {
trace!(" control accept");
self.control.accept();

1
embassy-usb/src/descriptor.rs
View file

@ -244,6 +244,7 @@ impl<'a> DescriptorWriter<'a> {
}
/// Writes a string descriptor.
#[allow(unused)]
pub(crate) fn string(&mut self, string: &str) {
let mut pos = self.position;

270
embassy-usb/src/lib.rs
View file

@ -100,15 +100,19 @@ struct Interface<'d> {
}
pub struct UsbDevice<'d, D: Driver<'d>> {
control_buf: &'d mut [u8],
control: ControlPipe<D::ControlPipe>,
inner: Inner<'d, D>,
}
struct Inner<'d, D: Driver<'d>> {
bus: D::Bus,
handler: Option<&'d dyn DeviceStateHandler>,
control: ControlPipe<D::ControlPipe>,
config: Config<'d>,
device_descriptor: &'d [u8],
config_descriptor: &'d [u8],
bos_descriptor: &'d [u8],
control_buf: &'d mut [u8],
device_state: UsbDeviceState,
suspended: bool,
@ -139,20 +143,23 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
let bus = driver.into_bus();
Self {
bus,
config,
handler,
control: ControlPipe::new(control),
device_descriptor,
config_descriptor,
bos_descriptor,
control_buf,
device_state: UsbDeviceState::Disabled,
suspended: false,
remote_wakeup_enabled: false,
self_powered: false,
pending_address: 0,
interfaces,
control: ControlPipe::new(control),
inner: Inner {
bus,
config,
handler,
device_descriptor,
config_descriptor,
bos_descriptor,
device_state: UsbDeviceState::Disabled,
suspended: false,
remote_wakeup_enabled: false,
self_powered: false,
pending_address: 0,
interfaces,
},
}
}
@ -176,28 +183,60 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
/// before calling any other `UsbDevice` methods to fully reset the
/// peripheral.
pub async fn run_until_suspend(&mut self) -> () {
if self.device_state == UsbDeviceState::Disabled {
self.bus.enable().await;
self.device_state = UsbDeviceState::Default;
if self.inner.device_state == UsbDeviceState::Disabled {
self.inner.bus.enable().await;
self.inner.device_state = UsbDeviceState::Default;
if let Some(h) = &self.handler {
if let Some(h) = &self.inner.handler {
h.enabled(true);
}
}
loop {
let control_fut = self.control.setup();
let bus_fut = self.bus.poll();
let bus_fut = self.inner.bus.poll();
match select(bus_fut, control_fut).await {
Either::First(evt) => {
self.handle_bus_event(evt);
if self.suspended {
self.inner.handle_bus_event(evt);
if self.inner.suspended {
return;
}
}
Either::Second(req) => match req {
Setup::DataIn(req, stage) => self.handle_control_in(req, stage).await,
Setup::DataOut(req, stage) => self.handle_control_out(req, stage).await,
Setup::DataIn(req, mut stage) => {
// If we don't have an address yet, respond with max 1 packet.
// The host doesn't know our EP0 max packet size yet, and might assume
// a full-length packet is a short packet, thinking we're done sending data.
// See https://github.com/hathach/tinyusb/issues/184
const DEVICE_DESCRIPTOR_LEN: u8 = 18;
if self.inner.pending_address == 0
&& self.inner.config.max_packet_size_0 < DEVICE_DESCRIPTOR_LEN
&& (self.inner.config.max_packet_size_0 as usize) < stage.length
{
trace!("received control req while not addressed: capping response to 1 packet.");
stage.length = self.inner.config.max_packet_size_0 as _;
}
match self.inner.handle_control_in(req, &mut self.control_buf) {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
}
}
Setup::DataOut(req, stage) => {
let (data, stage) =
match self.control.data_out(self.control_buf, stage).await {
Ok(data) => data,
Err(_) => {
warn!("usb: failed to read CONTROL OUT data stage.");
return;
}
};
match self.inner.handle_control_out(req, data) {
OutResponse::Accepted => self.control.accept(stage),
OutResponse::Rejected => self.control.reject(),
}
}
},
}
}
@ -205,13 +244,13 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
/// Disables the USB peripheral.
pub async fn disable(&mut self) {
if self.device_state != UsbDeviceState::Disabled {
self.bus.disable().await;
self.device_state = UsbDeviceState::Disabled;
self.suspended = false;
self.remote_wakeup_enabled = false;
if self.inner.device_state != UsbDeviceState::Disabled {
self.inner.bus.disable().await;
self.inner.device_state = UsbDeviceState::Disabled;
self.inner.suspended = false;
self.inner.remote_wakeup_enabled = false;
if let Some(h) = &self.handler {
if let Some(h) = &self.inner.handler {
h.enabled(false);
}
}
@ -221,9 +260,9 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
///
/// This future is cancel-safe.
pub async fn wait_resume(&mut self) {
while self.suspended {
let evt = self.bus.poll().await;
self.handle_bus_event(evt);
while self.inner.suspended {
let evt = self.inner.bus.poll().await;
self.inner.handle_bus_event(evt);
}
}
@ -236,11 +275,11 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
/// After dropping the future, [`UsbDevice::disable()`] should be called
/// before calling any other `UsbDevice` methods to fully reset the peripheral.
pub async fn remote_wakeup(&mut self) -> Result<(), RemoteWakeupError> {
if self.suspended && self.remote_wakeup_enabled {
self.bus.remote_wakeup().await?;
self.suspended = false;
if self.inner.suspended && self.inner.remote_wakeup_enabled {
self.inner.bus.remote_wakeup().await?;
self.inner.suspended = false;
if let Some(h) = &self.handler {
if let Some(h) = &self.inner.handler {
h.suspended(false);
}
@ -249,7 +288,9 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
Err(RemoteWakeupError::InvalidState)
}
}
}
impl<'d, D: Driver<'d>> Inner<'d, D> {
fn handle_bus_event(&mut self, evt: Event) {
match evt {
Event::Reset => {
@ -288,18 +329,10 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
}
}
async fn handle_control_out(&mut self, req: Request, stage: DataOutStage) {
fn handle_control_out(&mut self, req: Request, data: &[u8]) -> OutResponse {
const CONFIGURATION_NONE_U16: u16 = CONFIGURATION_NONE as u16;
const CONFIGURATION_VALUE_U16: u16 = CONFIGURATION_VALUE as u16;
let (data, stage) = match self.control.data_out(self.control_buf, stage).await {
Ok(data) => data,
Err(_) => {
warn!("usb: failed to read CONTROL OUT data stage.");
return;
}
};
match (req.request_type, req.recipient) {
(RequestType::Standard, Recipient::Device) => match (req.request, req.value) {
(Request::CLEAR_FEATURE, Request::FEATURE_DEVICE_REMOTE_WAKEUP) => {
@ -307,14 +340,14 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if let Some(h) = &self.handler {
h.remote_wakeup_enabled(false);
}
self.control.accept(stage)
OutResponse::Accepted
}
(Request::SET_FEATURE, Request::FEATURE_DEVICE_REMOTE_WAKEUP) => {
self.remote_wakeup_enabled = true;
if let Some(h) = &self.handler {
h.remote_wakeup_enabled(true);
}
self.control.accept(stage)
OutResponse::Accepted
}
(Request::SET_ADDRESS, addr @ 1..=127) => {
self.pending_address = addr as u8;
@ -323,7 +356,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if let Some(h) = &self.handler {
h.addressed(self.pending_address);
}
self.control.accept(stage)
OutResponse::Accepted
}
(Request::SET_CONFIGURATION, CONFIGURATION_VALUE_U16) => {
debug!("SET_CONFIGURATION: configured");
@ -344,10 +377,10 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
h.configured(true);
}
self.control.accept(stage)
OutResponse::Accepted
}
(Request::SET_CONFIGURATION, CONFIGURATION_NONE_U16) => match self.device_state {
UsbDeviceState::Default => self.control.accept(stage),
UsbDeviceState::Default => OutResponse::Accepted,
_ => {
debug!("SET_CONFIGURATION: unconfigured");
self.device_state = UsbDeviceState::Addressed;
@ -363,15 +396,15 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
h.configured(false);
}
self.control.accept(stage)
OutResponse::Accepted
}
},
_ => self.control.reject(),
_ => OutResponse::Rejected,
},
(RequestType::Standard, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
None => return OutResponse::Rejected,
};
match req.request {
@ -380,7 +413,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if new_altsetting >= iface.num_alt_settings {
warn!("SET_INTERFACE: trying to select alt setting out of range.");
return self.control.reject();
return OutResponse::Rejected;
}
iface.current_alt_setting = new_altsetting;
@ -402,55 +435,39 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if let Some(handler) = &mut iface.handler {
handler.set_alternate_setting(new_altsetting);
}
self.control.accept(stage)
OutResponse::Accepted
}
_ => self.control.reject(),
_ => OutResponse::Rejected,
}
}
(RequestType::Standard, Recipient::Endpoint) => match (req.request, req.value) {
(Request::SET_FEATURE, Request::FEATURE_ENDPOINT_HALT) => {
let ep_addr = ((req.index as u8) & 0x8f).into();
self.bus.endpoint_set_stalled(ep_addr, true);
self.control.accept(stage)
OutResponse::Accepted
}
(Request::CLEAR_FEATURE, Request::FEATURE_ENDPOINT_HALT) => {
let ep_addr = ((req.index as u8) & 0x8f).into();
self.bus.endpoint_set_stalled(ep_addr, false);
self.control.accept(stage)
OutResponse::Accepted
}
_ => self.control.reject(),
_ => OutResponse::Rejected,
},
(RequestType::Class, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
None => return OutResponse::Rejected,
};
match &mut iface.handler {
Some(handler) => match handler.control_out(req, data) {
OutResponse::Accepted => self.control.accept(stage),
OutResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
Some(handler) => handler.control_out(req, data),
None => OutResponse::Rejected,
}
}
_ => self.control.reject(),
_ => OutResponse::Rejected,
}
}
async fn handle_control_in(&mut self, req: Request, mut stage: DataInStage) {
// If we don't have an address yet, respond with max 1 packet.
// The host doesn't know our EP0 max packet size yet, and might assume
// a full-length packet is a short packet, thinking we're done sending data.
// See https://github.com/hathach/tinyusb/issues/184
const DEVICE_DESCRIPTOR_LEN: u8 = 18;
if self.pending_address == 0
&& self.config.max_packet_size_0 < DEVICE_DESCRIPTOR_LEN
&& (self.config.max_packet_size_0 as usize) < stage.length
{
trace!("received control req while not addressed: capping response to 1 packet.");
stage.length = self.config.max_packet_size_0 as _;
}
fn handle_control_in<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
match (req.request_type, req.recipient) {
(RequestType::Standard, Recipient::Device) => match req.request {
Request::GET_STATUS => {
@ -461,42 +478,41 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if self.remote_wakeup_enabled {
status |= 0x0002;
}
self.control.accept_in(&status.to_le_bytes(), stage).await
buf[..2].copy_from_slice(&status.to_le_bytes());
InResponse::Accepted(&buf[..2])
}
Request::GET_DESCRIPTOR => self.handle_get_descriptor(req, stage).await,
Request::GET_DESCRIPTOR => self.handle_get_descriptor(req, buf),
Request::GET_CONFIGURATION => {
let status = match self.device_state {
UsbDeviceState::Configured => CONFIGURATION_VALUE,
_ => CONFIGURATION_NONE,
};
self.control.accept_in(&status.to_le_bytes(), stage).await
buf[0] = status;
InResponse::Accepted(&buf[..1])
}
_ => self.control.reject(),
_ => InResponse::Rejected,
},
(RequestType::Standard, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
None => return InResponse::Rejected,
};
match req.request {
Request::GET_STATUS => {
let status: u16 = 0;
self.control.accept_in(&status.to_le_bytes(), stage).await
buf[..2].copy_from_slice(&status.to_le_bytes());
InResponse::Accepted(&buf[..2])
}
Request::GET_INTERFACE => {
self.control
.accept_in(&[iface.current_alt_setting], stage)
.await;
buf[0] = iface.current_alt_setting;
InResponse::Accepted(&buf[..1])
}
Request::GET_DESCRIPTOR => match &mut iface.handler {
Some(handler) => match handler.get_descriptor(req, self.control_buf) {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
Some(handler) => handler.get_descriptor(req, buf),
None => InResponse::Rejected,
},
_ => self.control.reject(),
_ => InResponse::Rejected,
}
}
(RequestType::Standard, Recipient::Endpoint) => match req.request {
@ -506,44 +522,40 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if self.bus.endpoint_is_stalled(ep_addr) {
status |= 0x0001;
}
self.control.accept_in(&status.to_le_bytes(), stage).await
buf[..2].copy_from_slice(&status.to_le_bytes());
InResponse::Accepted(&buf[..2])
}
_ => self.control.reject(),
_ => InResponse::Rejected,
},
(RequestType::Class, Recipient::Interface) => {
let iface = match self.interfaces.get_mut(req.index as usize) {
Some(iface) => iface,
None => return self.control.reject(),
None => return InResponse::Rejected,
};
match &mut iface.handler {
Some(handler) => match handler.control_in(req, self.control_buf) {
InResponse::Accepted(data) => self.control.accept_in(data, stage).await,
InResponse::Rejected => self.control.reject(),
},
None => self.control.reject(),
Some(handler) => handler.control_in(req, buf),
None => InResponse::Rejected,
}
}
_ => self.control.reject(),
_ => InResponse::Rejected,
}
}
async fn handle_get_descriptor(&mut self, req: Request, stage: DataInStage) {
fn handle_get_descriptor<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
let (dtype, index) = req.descriptor_type_index();
match dtype {
descriptor_type::BOS => self.control.accept_in(self.bos_descriptor, stage).await,
descriptor_type::DEVICE => self.control.accept_in(self.device_descriptor, stage).await,
descriptor_type::CONFIGURATION => {
self.control.accept_in(self.config_descriptor, stage).await
}
descriptor_type::BOS => InResponse::Accepted(self.bos_descriptor),
descriptor_type::DEVICE => InResponse::Accepted(self.device_descriptor),
descriptor_type::CONFIGURATION => InResponse::Accepted(self.config_descriptor),
descriptor_type::STRING => {
if index == 0 {
self.control
.accept_in_writer(req, stage, |w| {
w.write(descriptor_type::STRING, &lang_id::ENGLISH_US.to_le_bytes());
})
.await
buf[0] = 4; // len
buf[1] = descriptor_type::STRING;
buf[2] = lang_id::ENGLISH_US as u8;
buf[3] = (lang_id::ENGLISH_US >> 8) as u8;
InResponse::Accepted(&buf[..4])
} else {
let s = match index {
STRING_INDEX_MANUFACTURER => self.config.manufacturer,
@ -565,7 +577,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
if let Some(handler) = &mut iface.handler {
let index = StringIndex::new(index);
let lang_id = req.index;
handler.get_string(index, lang_id, self.control_buf)
handler.get_string(index, lang_id)
} else {
warn!("String requested to an interface with no handler.");
None
@ -578,15 +590,29 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
};
if let Some(s) = s {
self.control
.accept_in_writer(req, stage, |w| w.string(s))
.await
if buf.len() < 2 {
panic!("control buffer too small");
}
buf[1] = descriptor_type::STRING;
let mut pos = 2;
for c in s.encode_utf16() {
if pos >= buf.len() {
panic!("control buffer too small");
}
buf[pos..pos + 2].copy_from_slice(&c.to_le_bytes());
pos += 2;
}
buf[0] = pos as u8;
InResponse::Accepted(&buf[..pos])
} else {
self.control.reject()
InResponse::Rejected
}
}
}
_ => self.control.reject(),
_ => InResponse::Rejected,
}
}
}