media/v4l2-core/v4l2-fh.c

3  * v4l2-fh.c
16 #include <media/v4l2-fh.h>
21 void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
23 	fh->vdev = vdev;
25 	fh->ctrl_handler = vdev->ctrl_handler;
26 	INIT_LIST_HEAD(&fh->list);
27 	set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);
35 	fh->prio = V4L2_PRIORITY_UNSET;
36 	init_waitqueue_head(&fh->wait);
37 	INIT_LIST_HEAD(&fh->available);
38 	INIT_LIST_HEAD(&fh->subscribed);
39 	fh->sequence = -1;
40 	mutex_init(&fh->subscribe_lock);
44 void v4l2_fh_add(struct v4l2_fh *fh)
48 	v4l2_prio_open(fh->vdev->prio, &fh->prio);
49 	spin_lock_irqsave(&fh->vdev->fh_lock, flags);
50 	list_add(&fh->list, &fh->vdev->fh_list);
51 	spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
58 	struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
60 	filp->private_data = fh;
61 	if (fh == NULL)
63 	v4l2_fh_init(fh, vdev);
64 	v4l2_fh_add(fh);
69 void v4l2_fh_del(struct v4l2_fh *fh)
73 	spin_lock_irqsave(&fh->vdev->fh_lock, flags);
74 	list_del_init(&fh->list);
75 	spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
76 	v4l2_prio_close(fh->vdev->prio, fh->prio);
80 void v4l2_fh_exit(struct v4l2_fh *fh)
82 	if (fh->vdev == NULL)
84 	v4l_disable_media_source(fh->vdev);
85 	v4l2_event_unsubscribe_all(fh);
86 	mutex_destroy(&fh->subscribe_lock);
87 	fh->vdev = NULL;
93 	struct v4l2_fh *fh = filp->private_data;
95 	if (fh) {
96 		v4l2_fh_del(fh);
97 		v4l2_fh_exit(fh);
98 		kfree(fh);
105 int v4l2_fh_is_singular(struct v4l2_fh *fh)
110 	if (fh == NULL || fh->vdev == NULL)
112 	spin_lock_irqsave(&fh->vdev->fh_lock, flags);
113 	is_singular = list_is_singular(&fh->list);
114 	spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);