[media] v4l: ov772x: simplify pointer dereference

Use a more direct way to obtain a pointer to struct ov772x_priv, where the
subdevice is available.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ov772x.c

@@ -600,7 +600,7 @@ static int ov772x_reset(struct i2c_client *client)
 static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 
 	if (!enable) {
 		ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE, SOFT_SLEEP_MODE);
@@ -645,8 +645,7 @@ static unsigned long ov772x_query_bus_param(struct soc_camera_device *icd)
 
 static int ov772x_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 
 	switch (ctrl->id) {
 	case V4L2_CID_VFLIP:
@@ -665,7 +664,7 @@ static int ov772x_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 static int ov772x_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 	int ret = 0;
 	u8 val;
 
@@ -715,8 +714,7 @@ static int ov772x_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 static int ov772x_g_chip_ident(struct v4l2_subdev *sd,
 			       struct v4l2_dbg_chip_ident *id)
 {
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 
 	id->ident    = priv->model;
 	id->revision = 0;
@@ -955,7 +953,7 @@ static int ov772x_g_fmt(struct v4l2_subdev *sd,
 			struct v4l2_mbus_framefmt *mf)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 
 	if (!priv->win || !priv->cfmt) {
 		u32 width = VGA_WIDTH, height = VGA_HEIGHT;
@@ -978,7 +976,7 @@ static int ov772x_s_fmt(struct v4l2_subdev *sd,
 			struct v4l2_mbus_framefmt *mf)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 	int ret = ov772x_set_params(client, &mf->width, &mf->height,
 				    mf->code);
 
@@ -991,8 +989,7 @@ static int ov772x_s_fmt(struct v4l2_subdev *sd,
 static int ov772x_try_fmt(struct v4l2_subdev *sd,
 			  struct v4l2_mbus_framefmt *mf)
 {
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	struct ov772x_priv *priv = to_ov772x(client);
+	struct ov772x_priv *priv = container_of(sd, struct ov772x_priv, subdev);
 	const struct ov772x_win_size *win;
 	int i;