V4L/DVB (4637): Add a default method for VIDIOC_G_PARM

For most drivers, VIDIOC_G_PARM will just return the current standard fps.
So, instead of failing, drivers based on video_ioctl2 will implement the
default method.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 23 insertions, 3 deletions

diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 26e7ea252a0..479a0675cf6 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -1283,9 +1283,29 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
         case VIDIOC_G_PARM:
         {
                 struct v4l2_streamparm *p=arg;
-                if (!vfd->vidioc_g_parm)
-                        break;
-                ret=vfd->vidioc_g_parm(file, fh, p);
+                if (vfd->vidioc_g_parm) {
+                        ret=vfd->vidioc_g_parm(file, fh, p);
+                } else {
+                        struct v4l2_standard s;
+
+                        if (!vfd->tvnormsize) {
+                                printk (KERN_WARNING "%s: no TV norms defined!\n",
+                                                        vfd->name);
+                                break;
+                        }
+
+                        if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                                return -EINVAL;
+
+                        v4l2_video_std_construct(&s, vfd->tvnorms[vfd->current_norm].id,
+                                                 vfd->tvnorms[vfd->current_norm].name);
+
+                        memset(p,0,sizeof(*p));
+
+                        p->parm.capture.timeperframe = s.frameperiod;
+                        ret=0;
+                }
+
                 dbgarg (cmd, "type=%d\n", p->type);
                 break;
         }