diff options
Diffstat (limited to 'include/media/v4l2-subdev.h')
| -rw-r--r-- | include/media/v4l2-subdev.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 349e1c18cf48..e807aa96ed3b 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -755,7 +755,17 @@ struct v4l2_subdev_ops { * * @open: called when the subdev device node is opened by an application. * - * @close: called when the subdev device node is closed. + * @close: called when the subdev device node is closed. Please note that + * it is possible for @close to be called after @unregistered! + * + * @release: called when the last user of the subdev device is gone. This + * happens after the @unregistered callback and when the last open + * filehandle to the v4l-subdevX device node was closed. If no device + * node was created for this sub-device, then the @release callback + * is called right after the @unregistered callback. + * The @release callback is typically used to free the memory containing + * the v4l2_subdev structure. It is almost certainly required for any + * sub-device that sets the V4L2_SUBDEV_FL_HAS_DEVNODE flag. * * .. note:: * Never call this from drivers, only the v4l2 framework can call @@ -766,6 +776,7 @@ struct v4l2_subdev_internal_ops { void (*unregistered)(struct v4l2_subdev *sd); int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh); int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh); + void (*release)(struct v4l2_subdev *sd); }; #define V4L2_SUBDEV_NAME_SIZE 32 |