[media] adv7842: add support to for the content type control

This receiver now supports reading the IT content type of the incoming
video.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
index 5fbb788e7b59..7ccb85d45224 100644
--- a/drivers/media/i2c/adv7842.c
+++ b/drivers/media/i2c/adv7842.c
@@ -1359,6 +1359,19 @@ static int adv7842_s_ctrl(struct v4l2_ctrl *ctrl)
         return -EINVAL;
 }
 
+static int adv7842_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+        struct v4l2_subdev *sd = to_sd(ctrl);
+
+        if (ctrl->id == V4L2_CID_DV_RX_IT_CONTENT_TYPE) {
+                ctrl->val = V4L2_DV_IT_CONTENT_TYPE_NO_ITC;
+                if ((io_read(sd, 0x60) & 1) && (infoframe_read(sd, 0x03) & 0x80))
+                        ctrl->val = (infoframe_read(sd, 0x05) >> 4) & 3;
+                return 0;
+        }
+        return -EINVAL;
+}
+
 static inline bool no_power(struct v4l2_subdev *sd)
 {
         return io_read(sd, 0x0c) & 0x24;
@@ -3022,6 +3035,7 @@ static int adv7842_subscribe_event(struct v4l2_subdev *sd,
 
 static const struct v4l2_ctrl_ops adv7842_ctrl_ops = {
         .s_ctrl = adv7842_s_ctrl,
+        .g_volatile_ctrl = adv7842_g_volatile_ctrl,
 };
 
 static const struct v4l2_subdev_core_ops adv7842_core_ops = {
@@ -3196,6 +3210,7 @@ static int adv7842_probe(struct i2c_client *client,
                 V4L2_DV_BT_CEA_640X480P59_94;
         struct adv7842_platform_data *pdata = client->dev.platform_data;
         struct v4l2_ctrl_handler *hdl;
+        struct v4l2_ctrl *ctrl;
         struct v4l2_subdev *sd;
         u16 rev;
         int err;
@@ -3261,6 +3276,11 @@ static int adv7842_probe(struct i2c_client *client,
                           V4L2_CID_SATURATION, 0, 255, 1, 128);
         v4l2_ctrl_new_std(hdl, &adv7842_ctrl_ops,
                           V4L2_CID_HUE, 0, 128, 1, 0);
+        ctrl = v4l2_ctrl_new_std_menu(hdl, &adv7842_ctrl_ops,
+                        V4L2_CID_DV_RX_IT_CONTENT_TYPE, V4L2_DV_IT_CONTENT_TYPE_NO_ITC,
+                        0, V4L2_DV_IT_CONTENT_TYPE_NO_ITC);
+        if (ctrl)
+                ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 
         /* custom controls */
         state->detect_tx_5v_ctrl = v4l2_ctrl_new_std(hdl, NULL,