[PATCH 10/11] media: v4l2: Add callback for show_fdinfo

[Detlev Casanova <detlev.casanova@collabora.com>]

Allow v4l2 drivers to add information in the fdinfo file matching the
opened /dev/videoX file.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---
 drivers/media/v4l2-core/v4l2-dev.c | 10 ++++++++++
 include/media/v4l2-dev.h           |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 10a126e50c1c..29c04f5f4c59 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -481,6 +481,15 @@ static int v4l2_release(struct inode *inode, struct file *filp)
 	return ret;
 }
 
+/* Override for the show_fdinfo function */
+static void v4l2_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+	struct video_device *vdev = video_devdata(filp);
+
+	if (vdev->fops->show_fdinfo)
+		vdev->fops->show_fdinfo(m, filp);
+}
+
 static const struct file_operations v4l2_fops = {
 	.owner = THIS_MODULE,
 	.read = v4l2_read,
@@ -494,6 +503,7 @@ static const struct file_operations v4l2_fops = {
 #endif
 	.release = v4l2_release,
 	.poll = v4l2_poll,
+	.show_fdinfo = v4l2_show_fdinfo,
 };
 
 /**
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 2e0f6d2e6a78..1635ab186f21 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -212,6 +212,7 @@ struct v4l2_file_operations {
 	int (*mmap) (struct file *, struct vm_area_struct *);
 	int (*open) (struct file *);
 	int (*release) (struct file *);
+	void (*show_fdinfo)(struct seq_file *, struct file *);
 };
 
 /*
-- 
2.53.0