[media] ivtv: add IVTV_IOC_PASSTHROUGH_MODE

With this private ioctl it is possible to use the ivtv decoder without
requiring the dvb/video.h and dvb/audio.h headers.

Eventually support for those DVB APIs will be dropped from ivtv.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/drivers/media/video/ivtv/ivtv-ioctl.c b/drivers/media/video/ivtv/ivtv-ioctl.c
index cd8032693e6d..37ac32b53baf 100644
--- a/drivers/media/video/ivtv/ivtv-ioctl.c
+++ b/drivers/media/video/ivtv/ivtv-ioctl.c
@@ -1625,6 +1625,12 @@ static int ivtv_decoder_ioctls(struct file *filp, unsigned int cmd, void *arg)
                 return ivtv_yuv_prep_frame(itv, args);
         }
 
+        case IVTV_IOC_PASSTHROUGH_MODE:
+                IVTV_DEBUG_IOCTL("IVTV_IOC_PASSTHROUGH_MODE\n");
+                if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
+                        return -EINVAL;
+                return ivtv_passthrough_mode(itv, *(int *)arg != 0);
+
         case VIDEO_GET_PTS: {
                 s64 *pts = arg;
                 s64 frame;
@@ -1786,6 +1792,7 @@ static long ivtv_default(struct file *file, void *fh, bool valid_prio,
 
         if (!valid_prio) {
                 switch (cmd) {
+                case IVTV_IOC_PASSTHROUGH_MODE:
                 case VIDEO_PLAY:
                 case VIDEO_STOP:
                 case VIDEO_FREEZE:
@@ -1811,6 +1818,7 @@ static long ivtv_default(struct file *file, void *fh, bool valid_prio,
         }
 
         case IVTV_IOC_DMA_FRAME:
+        case IVTV_IOC_PASSTHROUGH_MODE:
         case VIDEO_GET_PTS:
         case VIDEO_GET_FRAME_COUNT:
         case VIDEO_GET_EVENT:
diff --git a/include/linux/ivtv.h b/include/linux/ivtv.h
index 062d20f74322..42bf725751af 100644
--- a/include/linux/ivtv.h
+++ b/include/linux/ivtv.h
@@ -58,7 +58,11 @@ struct ivtv_dma_frame {
         __u32 src_height;
 };
 
-#define IVTV_IOC_DMA_FRAME  _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)
+#define IVTV_IOC_DMA_FRAME              _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)
+
+/* Select the passthrough mode (if the argument is non-zero). In the passthrough
+   mode the output of the encoder is passed immediately into the decoder. */
+#define IVTV_IOC_PASSTHROUGH_MODE       _IOW ('V', BASE_VIDIOC_PRIVATE+1, int)
 
 /* Deprecated defines: applications should use the defines from videodev2.h */
 #define IVTV_SLICED_TYPE_TELETEXT_B     V4L2_MPEG_VBI_IVTV_TELETEXT_B