[media] em28xx: Add VIDIOC_QUERYSTD support

Allow subdevs to return the detected standards

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 61f35c8d66d2..62182e311060 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1156,6 +1156,21 @@ static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
         return 0;
 }
 
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+        struct em28xx_fh   *fh  = priv;
+        struct em28xx      *dev = fh->dev;
+        int                rc;
+
+        rc = check_dev(dev);
+        if (rc < 0)
+                return rc;
+
+        v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
+
+        return 0;
+}
+
 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
 {
         struct em28xx_fh   *fh  = priv;
@@ -2354,6 +2369,7 @@ static const struct v4l2_ioctl_ops video_ioctl_ops = {
         .vidioc_qbuf                = vidioc_qbuf,
         .vidioc_dqbuf               = vidioc_dqbuf,
         .vidioc_g_std               = vidioc_g_std,
+        .vidioc_querystd            = vidioc_querystd,
         .vidioc_s_std               = vidioc_s_std,
         .vidioc_g_parm              = vidioc_g_parm,
         .vidioc_s_parm              = vidioc_s_parm,