[media] V4L: Add v4l2_ctrl_subdev_subscribe_event() helper function
Add a v4l2 core helper function that can be used as the subdev .subscribe_event handler. This allows to eliminate some boilerplate from drivers that are only handling the control events. Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -2885,6 +2885,15 @@ int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
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}
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EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
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int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
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struct v4l2_event_subscription *sub)
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{
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if (!sd->ctrl_handler)
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return -EINVAL;
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return v4l2_ctrl_subscribe_event(fh, sub);
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}
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EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
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unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
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{
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struct v4l2_fh *fh = file->private_data;
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@ -654,4 +654,9 @@ int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs
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int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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/* Can be used as a subscribe_event function that just subscribes control
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events. */
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int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
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struct v4l2_event_subscription *sub);
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#endif
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