uvc: log setup/data events

server/src/bin/lesavka-uvc.rs

@@ -105,6 +105,10 @@ fn main() -> Result<()> {
     let (dev, cfg) = parse_args()?;
     eprintln!("[lesavka-uvc] starting (dev={dev})");
 
+    let debug = env::var("LESAVKA_UVC_DEBUG").is_ok();
+    let mut setup_seen: u64 = 0;
+    let mut data_seen: u64 = 0;
+
     loop {
         let file = open_with_retry(&dev)?;
         let fd = file.as_raw_fd();
@@ -154,6 +158,17 @@ fn main() -> Result<()> {
                 UVC_EVENT_STREAMOFF => eprintln!("[lesavka-uvc] stream off"),
                 UVC_EVENT_SETUP => {
                     let req = parse_ctrl_request(event_bytes(&ev));
+                    setup_seen += 1;
+                    if debug || setup_seen <= 10 {
+                        eprintln!(
+                            "[lesavka-uvc] setup #{setup_seen} rt=0x{:02x} rq=0x{:02x} val=0x{:04x} idx=0x{:04x} len={}",
+                            req.b_request_type,
+                            req.b_request,
+                            req.w_value,
+                            req.w_index,
+                            req.w_length
+                        );
+                    }
                     handle_setup(
                         fd,
                         uvc_send_response,
@@ -164,6 +179,13 @@ fn main() -> Result<()> {
                 }
                 UVC_EVENT_DATA => {
                     let data = parse_request_data(event_bytes(&ev));
+                    data_seen += 1;
+                    if debug || data_seen <= 10 {
+                        eprintln!(
+                            "[lesavka-uvc] data #{data_seen} len={}",
+                            data.length
+                        );
+                    }
                     handle_data(fd, uvc_send_response, &mut state, &mut pending, data);
                 }
                 _ => {}