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Controls can be exposed to userspace via a v4l-subdevX device, and userspace has to be able to subscribe to control events so that it is notified when the control changes value. If a control handler is set for the subdev then set the HAS_EVENTS flag automatically into v4l2_subdev_init_finalize() and use v4l2_ctrl_subdev_subscribe_event() and v4l2_event_subdev_unsubscribe() as default if subdev don't have .(un)subscribe control operations. This simplifies subdev drivers by avoiding the need to set the V4L2_SUBDEV_FL_HAS_EVENTS flag and plug the event handlers, and ensures consistency of the API exposed to userspace. Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| tuner-core.c | ||
| v4l2-async.c | ||
| v4l2-cci.c | ||
| v4l2-common.c | ||
| v4l2-compat-ioctl32.c | ||
| v4l2-ctrls-api.c | ||
| v4l2-ctrls-core.c | ||
| v4l2-ctrls-defs.c | ||
| v4l2-ctrls-priv.h | ||
| v4l2-ctrls-request.c | ||
| v4l2-dev.c | ||
| v4l2-device.c | ||
| v4l2-dv-timings.c | ||
| v4l2-event.c | ||
| v4l2-fh.c | ||
| v4l2-flash-led-class.c | ||
| v4l2-fwnode.c | ||
| v4l2-h264.c | ||
| v4l2-i2c.c | ||
| v4l2-ioctl.c | ||
| v4l2-jpeg.c | ||
| v4l2-mc.c | ||
| v4l2-mem2mem.c | ||
| v4l2-spi.c | ||
| v4l2-subdev-priv.h | ||
| v4l2-subdev.c | ||
| v4l2-trace.c | ||
| v4l2-vp9.c | ||