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devices: usb: clean up intercepted_control_transfer

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Rearrange the control request type match to check the request and
recipient together in a tuple (along with direction, which will be
different for a Get Descriptor request, to be added in the next commit).

No functional change.

BUG=b:180238956
BUG=chromium:1030778
TEST=Share USB device with Crostini

Change-Id: I51badd8f8b067a5e19216a92257c2b75c2041663
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2811860
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This commit is contained in:
Daniel Verkamp 2021-04-05 14:40:01 -07:00 committed by Commit Bot
parent 7b17f50df9
commit 425e4aad1e
1 changed files with 32 additions and 27 deletions
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59
devices/src/usb/host_backend/host_device.rs
View file

@ -95,43 +95,48 @@ impl HostDevice {
fn intercepted_control_transfer(&mut self, xhci_transfer: &XhciTransfer) -> Result<bool> {
let direction = self.control_request_setup.get_direction();
let recipient = self.control_request_setup.get_recipient();
let standard_request = self.control_request_setup.get_standard_request();
if direction != ControlRequestDataPhaseTransferDirection::HostToDevice {
// Only host to device requests are intercepted currently.
let standard_request = if let Some(req) = self.control_request_setup.get_standard_request()
{
req
} else {
// Unknown control requests will be passed through to the device.
return Ok(false);
}
};
let status = match standard_request {
Some(StandardControlRequest::SetAddress) => {
if recipient != ControlRequestRecipient::Device {
return Ok(false);
}
let (status, bytes_transferred) = match (standard_request, recipient, direction) {
(
StandardControlRequest::SetAddress,
ControlRequestRecipient::Device,
ControlRequestDataPhaseTransferDirection::HostToDevice,
) => {
usb_debug!("host device handling set address");
let addr = self.control_request_setup.value as u32;
self.set_address(addr);
TransferStatus::Completed
}
Some(StandardControlRequest::SetConfiguration) => {
if recipient != ControlRequestRecipient::Device {
return Ok(false);
(TransferStatus::Completed, 0)
}
(
StandardControlRequest::SetConfiguration,
ControlRequestRecipient::Device,
ControlRequestDataPhaseTransferDirection::HostToDevice,
) => {
usb_debug!("host device handling set config");
self.set_config()?
}
Some(StandardControlRequest::SetInterface) => {
if recipient != ControlRequestRecipient::Interface {
return Ok(false);
(self.set_config()?, 0)
}
(
StandardControlRequest::SetInterface,
ControlRequestRecipient::Interface,
ControlRequestDataPhaseTransferDirection::HostToDevice,
) => {
usb_debug!("host device handling set interface");
self.set_interface()?
}
Some(StandardControlRequest::ClearFeature) => {
if recipient != ControlRequestRecipient::Endpoint {
return Ok(false);
(self.set_interface()?, 0)
}
(
StandardControlRequest::ClearFeature,
ControlRequestRecipient::Endpoint,
ControlRequestDataPhaseTransferDirection::HostToDevice,
) => {
usb_debug!("host device handling clear feature");
self.clear_feature()?
(self.clear_feature()?, 0)
}
_ => {
// Other requests will be passed through to the device.
@ -140,7 +145,7 @@ impl HostDevice {
};
xhci_transfer
.on_transfer_complete(&status, 0)
.on_transfer_complete(&status, bytes_transferred)
.map_err(Error::TransferComplete)?;
Ok(true)
}