[media] cx18: mmap() support for raw YUV video capture

Add support for mmap method streaming of raw YUV video on cx18-based
hardware, in addition to the existing support for read() streaming of
raw YUV and MPEG-2 encoded video.

[simon.farnsworth@onelan.co.uk: I forward-ported this from Steven's original work,
 done under contract to ONELAN. The original code is at
 http://www.kernellabs.com/hg/~stoth/cx18-videobuf]

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c
index 6fbc356113c1..eeb455a8b726 100644
--- a/drivers/media/video/cx18/cx18-streams.c
+++ b/drivers/media/video/cx18/cx18-streams.c
@@ -44,6 +44,7 @@ static struct v4l2_file_operations cx18_v4l2_enc_fops = {
         .unlocked_ioctl = cx18_v4l2_ioctl,
         .release = cx18_v4l2_close,
         .poll = cx18_v4l2_enc_poll,
+        .mmap = cx18_v4l2_mmap,
 };
 
 /* offset from 0 to register ts v4l2 minors on */
@@ -132,6 +133,15 @@ static void cx18_stream_init(struct cx18 *cx, int type)
         cx18_queue_init(&s->q_idle);
 
         INIT_WORK(&s->out_work_order, cx18_out_work_handler);
+
+        INIT_LIST_HEAD(&s->vb_capture);
+        s->vb_timeout.function = cx18_vb_timeout;
+        s->vb_timeout.data = (unsigned long)s;
+        init_timer(&s->vb_timeout);
+        spin_lock_init(&s->vb_lock);
+
+        /* Assume the previous pixel default */
+        s->pixelformat = V4L2_PIX_FMT_HM12;
 }
 
 static int cx18_prep_dev(struct cx18 *cx, int type)
@@ -729,6 +739,19 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
                     test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
                           (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute_yuv) << 8) | 1);
+
+                /* Enable the Video Format Converter for UYVY 4:2:2 support,
+                 * rather than the default HM12 Macroblovk 4:2:0 support.
+                 */
+                if (captype == CAPTURE_CHANNEL_TYPE_YUV) {
+                        if (s->pixelformat == V4L2_PIX_FMT_YUYV)
+                                cx18_vapi(cx, CX18_CPU_SET_VFC_PARAM, 2,
+                                        s->handle, 1);
+                        else
+                                /* If in doubt, default to HM12 */
+                                cx18_vapi(cx, CX18_CPU_SET_VFC_PARAM, 2,
+                                        s->handle, 0);
+                }
         }
 
         if (atomic_read(&cx->tot_capturing) == 0) {