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server: adapt UVC ctrl length from host

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This commit is contained in:
Brad Stein 2026-01-06 15:24:39 -03:00
parent 83f2aac696
commit 6a76be3c38
1 changed files with 22 additions and 0 deletions
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22
server/src/bin/lesavka-uvc.rs
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@ -359,6 +359,9 @@ fn handle_setup(
};
let selector = (req.w_value >> 8) as u8;
let is_in = (req.b_request_type & USB_DIR_IN) != 0;
if matches!(selector, UVC_VS_PROBE_CONTROL | UVC_VS_COMMIT_CONTROL) {
maybe_update_ctrl_len(state, req.w_length, debug);
}
let interface = map_interface(interface_raw, selector, interfaces, debug);
if !is_in && req.b_request == UVC_SET_CUR {
@ -425,6 +428,25 @@ fn map_interface(raw: u8, selector: u8, interfaces: UvcInterfaces, debug: bool)
mapped
}
fn maybe_update_ctrl_len(state: &mut UvcState, w_length: u16, debug: bool) {
let want = w_length as usize;
if !(want == STREAM_CTRL_SIZE_11 || want == STREAM_CTRL_SIZE_15) {
return;
}
if state.ctrl_len == want {
return;
}
state.ctrl_len = want;
state.default = build_streaming_control(&state.cfg, state.ctrl_len);
state.probe = state.default;
state.commit = state.default;
if debug {
eprintln!("[lesavka-uvc] ctrl_len set to {}", state.ctrl_len);
}
}
fn handle_data(
state: &mut UvcState,
pending: &mut Option<PendingRequest>,