UVIDEO_FLAG_VENDOR_CLASS has been broken since r1.147: attach selected
only UICLASS_VIDEO interfaces, even after match accepted a device whose
video control interface incorrectly reports UICLASS_VENDOR.

Restore the vendor class path in attach, and add the remaining Logitech
vendor class UVC devices listed by Linux for which usbdevs already has
product IDs.

Ok?

Index: sys/dev/usb/uvideo.c
===================================================================
RCS file: /home/cvs/src/sys/dev/usb/uvideo.c,v
diff -u -p -r1.265 uvideo.c
--- sys/dev/usb/uvideo.c	6 Sep 2025 13:45:41 -0000	1.265
+++ sys/dev/usb/uvideo.c	2 Jun 2026 16:09:29 -0000
@@ -387,11 +387,41 @@ const struct uvideo_devs {
 	    UVIDEO_FLAG_ISIGHT_STREAM_HEADER
 	},
 	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
+	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMFUSION_1 },
+	    NULL,
+	    NULL,
+	    UVIDEO_FLAG_VENDOR_CLASS
+	},
+	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
+	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMORBITMP_1 },
+	    NULL,
+	    NULL,
+	    UVIDEO_FLAG_VENDOR_CLASS
+	},
+	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
+	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMNBPRO },
+	    NULL,
+	    NULL,
+	    UVIDEO_FLAG_VENDOR_CLASS
+	},
+	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
+	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMPRO5K_1 },
+	    NULL,
+	    NULL,
+	    UVIDEO_FLAG_VENDOR_CLASS
+	},
+	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
 	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMOEM_1 },
 	    NULL,
 	    NULL,
 	    UVIDEO_FLAG_VENDOR_CLASS
 	},
+	{   /* Incorrectly reports as bInterfaceClass=UICLASS_VENDOR */
+	    { USB_VENDOR_LOGITECH, USB_PRODUCT_LOGITECH_QUICKCAMOEM_2 },
+	    NULL,
+	    NULL,
+	    UVIDEO_FLAG_VENDOR_CLASS
+	},
 	{   /* Infrared camera not supported */
 	    { USB_VENDOR_CHICONY, USB_PRODUCT_CHICONY_IRCAMERA },
 	    NULL,
@@ -556,10 +586,13 @@ uvideo_attach(struct device *parent, str
 	usb_interface_descriptor_t *id;
 	const usb_descriptor_t *desc;
 	struct usbd_desc_iter iter;
+	const struct uvideo_devs *quirk;
 	int i;
 
 	sc->sc_udev = uaa->device;
 
+	quirk = uvideo_lookup(uaa->vendor, uaa->product);
+
 	/* Find the first unclaimed video interface. */
 	for (i = 0; i < uaa->nifaces; i++) {
 		if (usbd_iface_claimed(sc->sc_udev, i))
@@ -568,6 +601,10 @@ uvideo_attach(struct device *parent, str
 		if (id == NULL)
 			continue;
 		if (id->bInterfaceClass == UICLASS_VIDEO)
+			break;
+		if (quirk != NULL &&
+		    quirk->flags & UVIDEO_FLAG_VENDOR_CLASS &&
+		    id->bInterfaceClass == UICLASS_VENDOR)
 			break;
 	}
 	if (i == uaa->nifaces) {

-- 
wbr, Kirill