Hi, Sorry not coded yet, I first wanted to discuss the principle. I'm working on supporting so called dual mode cameras, which are cheap still cameras (low res, fixed lens, photos stored in battery backed sram), which can double as webcams. We currently have webcam drivers in the v4l subsystem for quite a few of these, but the coordination with libgphoto, which handles the still cam function from userspace is less then ideal. One of the problems is that if gphoto tries to access the device while another app is streaming from the webcam, this is allowed and the webcam driver sees a usb disconnect, after which the webcam app often is left in a very confused state. So I would like to be able to tell from the driver to return -EBUSY to the USBDEVFS_DISCONNECT ioctl. The idea here is for the driver to temporary disable USBDEVFS_DISCONNECT, when the application starts the video stream (not on opening the device as some apps like control panels for webcams will keep the device open indefinitely). And re-allow it when the cam stops streaming. Does this sound something for which a patch to allow driver to temporary disable USBDEVFS_DISCONNECT would be acceptable ? Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
