On Monday 22 February 2010 23:47:49 Sakari Ailus wrote: > >> +Drivers do not initialise events directly. The events are initialised > >> +through v4l2_fh_init() if video_device->ioctl_ops->vidioc_subscribe_event is > >> +non-NULL. This *MUST* be performed in the driver's > >> +v4l2_file_operations->open() handler. > >> + > >> +Events are delivered to user space through the poll system call. The driver > >> +can use v4l2_fh->events->wait wait_queue_head_t as the argument for > >> +poll_wait(). > >> + > >> +There are standard and private events. New standard events must use the > >> +smallest available event type. The drivers must allocate their events > >> +starting from base (V4L2_EVENT_PRIVATE_START + n * 1024) while individual > >> +events start from base + 1. > > > > What do you mean with 'while individual events start from base + 1'? I still > > don't understand that phrase. > > Will be "There are standard and private events. New standard events must > use the smallest available event type. The drivers must allocate their > events starting from base (V4L2_EVENT_PRIVATE_START + n * 1024) + 1." in > the next one. Ah, OK. But why '+ 1'? I don't really see a reason for that to be honest. Am I missing something? Regards, Hans -- Hans Verkuil - video4linux developer - sponsored by TANDBERG -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
