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uvc: clamp to configfs maxpacket

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This commit is contained in:
Brad Stein 2026-01-10 13:26:54 -03:00
parent 298aeabc10
commit cfe2430521
1 changed files with 22 additions and 0 deletions
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22
server/src/bin/lesavka-uvc.rs
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@ -301,6 +301,22 @@ impl UvcConfig {
max_packet
);
}
if let Some(cfg_max) = read_u32_file(
"/sys/kernel/config/usb_gadget/lesavka/functions/uvc.usb0/streaming_maxpacket",
) {
if max_packet > cfg_max {
eprintln!(
"[lesavka-uvc] configfs maxpacket {}: clamp max_packet {} -> {}",
cfg_max, max_packet, cfg_max
);
max_packet = cfg_max;
} else {
eprintln!(
"[lesavka-uvc] configfs maxpacket {}: max_packet {}",
cfg_max, max_packet
);
}
}
if env::var("LESAVKA_UVC_BULK").is_ok() {
max_packet = max_packet.min(512);
} else {
@ -773,6 +789,12 @@ fn env_u32_opt(name: &str) -> Option<u32> {
env::var(name).ok().and_then(|v| v.parse::<u32>().ok())
}
fn read_u32_file(path: &str) -> Option<u32> {
std::fs::read_to_string(path)
.ok()
.and_then(|v| v.trim().parse::<u32>().ok())
}
fn adjust_length(mut bytes: Vec<u8>, w_length: u16) -> Vec<u8> {
let want = (w_length as usize).min(UVC_DATA_SIZE);
if bytes.len() > want {