[media] soc_camera: Support VIDIOC_EXPBUF ioctl

This patch allows for exporting a dmabuf descriptor from soc_camera drivers.

Signed-off-by: Kazunori Kobayashi <kkobayas@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index ee8cdc95a9f9..8e61b976da19 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -437,6 +437,22 @@ static int soc_camera_prepare_buf(struct file *file, void *priv,
                 return vb2_prepare_buf(&icd->vb2_vidq, b);
 }
 
+static int soc_camera_expbuf(struct file *file, void *priv,
+                             struct v4l2_exportbuffer *p)
+{
+        struct soc_camera_device *icd = file->private_data;
+        struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+
+        if (icd->streamer != file)
+                return -EBUSY;
+
+        /* videobuf2 only */
+        if (ici->ops->init_videobuf)
+                return -EINVAL;
+        else
+                return vb2_expbuf(&icd->vb2_vidq, p);
+}
+
 /* Always entered with .host_lock held */
 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
 {
@@ -2083,6 +2099,7 @@ static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
         .vidioc_dqbuf            = soc_camera_dqbuf,
         .vidioc_create_bufs      = soc_camera_create_bufs,
         .vidioc_prepare_buf      = soc_camera_prepare_buf,
+        .vidioc_expbuf           = soc_camera_expbuf,
         .vidioc_streamon         = soc_camera_streamon,
         .vidioc_streamoff        = soc_camera_streamoff,
         .vidioc_cropcap          = soc_camera_cropcap,