V4L/DVB (7947): videodev: add vidioc_g_std callback.

The default videodev behavior for VIDIOC_G_STD is not correct for all devices.
Add a new callback that drivers can use instead.

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

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 91fd6cbc60ca..4d58b55095d7 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -1206,11 +1206,15 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
         {
                 v4l2_std_id *id = arg;
 
-                *id = vfd->current_norm;
-
-                dbgarg (cmd, "value=%08Lx\n", (long long unsigned) *id);
+                ret = 0;
+                /* Calls the specific handler */
+                if (vfd->vidioc_g_std)
+                        ret = vfd->vidioc_g_std(file, fh, id);
+                else
+                        *id = vfd->current_norm;
 
-                ret=0;
+                if (!ret)
+                        dbgarg(cmd, "value=%08Lx\n", (long long unsigned)*id);
                 break;
         }
         case VIDIOC_S_STD: