media: ipu3-imgu: Use MENU type for mode control

This addresses the below TODO item.
- Use V4L2_CTRL_TYPE_MENU for dual-pipe mode control. (Sakari)
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/ipu3/TODO

@@ -11,8 +11,6 @@ staging directory.
 - Prefix imgu for all public APIs, i.e. change ipu3_v4l2_register() to
   imgu_v4l2_register(). (Sakari)
 
-- Use V4L2_CTRL_TYPE_MENU for dual-pipe mode control. (Sakari)
-
 - IPU3 driver documentation (Laurent)
   Add diagram in driver rst to describe output capability.
   Comments on configuring v4l2 subdevs for CIO2 and ImgU.

drivers/staging/media/ipu3/include/intel-ipu3.h

@@ -16,12 +16,6 @@
 #define V4L2_CID_INTEL_IPU3_BASE	(V4L2_CID_USER_BASE + 0x10c0)
 #define V4L2_CID_INTEL_IPU3_MODE	(V4L2_CID_INTEL_IPU3_BASE + 1)
 
-/* custom ctrl to set pipe mode */
-enum ipu3_running_mode {
-	IPU3_RUNNING_MODE_VIDEO = 0,
-	IPU3_RUNNING_MODE_STILL = 1,
-};
-
 /******************* ipu3_uapi_stats_3a *******************/
 
 #define IPU3_UAPI_MAX_STRIPES				2

drivers/staging/media/ipu3/ipu3-v4l2.c

@@ -12,6 +12,9 @@
 
 /******************** v4l2_subdev_ops ********************/
 
+#define IPU3_RUNNING_MODE_VIDEO		0
+#define IPU3_RUNNING_MODE_STILL		1
+
 static int ipu3_subdev_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
 	struct imgu_v4l2_subdev *imgu_sd = container_of(sd,
@@ -1035,15 +1038,19 @@ static const struct v4l2_ctrl_ops ipu3_subdev_ctrl_ops = {
 	.s_ctrl = ipu3_sd_s_ctrl,
 };
 
+static const char * const ipu3_ctrl_mode_strings[] = {
+	"Video mode",
+	"Still mode",
+};
+
 static const struct v4l2_ctrl_config ipu3_subdev_ctrl_mode = {
 	.ops = &ipu3_subdev_ctrl_ops,
 	.id = V4L2_CID_INTEL_IPU3_MODE,
 	.name = "IPU3 Pipe Mode",
-	.type = V4L2_CTRL_TYPE_INTEGER,
-	.min = IPU3_RUNNING_MODE_VIDEO,
-	.max = IPU3_RUNNING_MODE_STILL,
-	.step = 1,
+	.type = V4L2_CTRL_TYPE_MENU,
+	.max = ARRAY_SIZE(ipu3_ctrl_mode_strings) - 1,
 	.def = IPU3_RUNNING_MODE_VIDEO,
+	.qmenu = ipu3_ctrl_mode_strings,
 };
 
 /******************** Framework registration ********************/