[media] v4l2-fh: add v4l2_fh_open and v4l2_fh_release helper functions

Add two new functions: v4l2_fh_open allocates and initializes a struct v4l2_fh
based on a struct file pointer and v4l2_fh_release releases and frees a struct
v4l2_fh.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/media/video/v4l2-fh.c b/drivers/media/video/v4l2-fh.c
index 78a1608a09d6..27242e5ca431 100644
--- a/drivers/media/video/v4l2-fh.c
+++ b/drivers/media/video/v4l2-fh.c
@@ -23,6 +23,7 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/slab.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-fh.h>
 #include <media/v4l2-event.h>
@@ -60,6 +61,20 @@ void v4l2_fh_add(struct v4l2_fh *fh)
 }
 EXPORT_SYMBOL_GPL(v4l2_fh_add);
 
+int v4l2_fh_open(struct file *filp)
+{
+        struct video_device *vdev = video_devdata(filp);
+        struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+
+        filp->private_data = fh;
+        if (fh == NULL)
+                return -ENOMEM;
+        v4l2_fh_init(fh, vdev);
+        v4l2_fh_add(fh);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_fh_open);
+
 void v4l2_fh_del(struct v4l2_fh *fh)
 {
         unsigned long flags;
@@ -81,3 +96,16 @@ void v4l2_fh_exit(struct v4l2_fh *fh)
         v4l2_event_free(fh);
 }
 EXPORT_SYMBOL_GPL(v4l2_fh_exit);
+
+int v4l2_fh_release(struct file *filp)
+{
+        struct v4l2_fh *fh = filp->private_data;
+
+        if (fh) {
+                v4l2_fh_del(fh);
+                v4l2_fh_exit(fh);
+                kfree(fh);
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_fh_release);