media: uvcvideo: Refactor uvc_ctrl_mappings_uvcXX

Convert the array of structs into an array of pointers, that way the
mappings can be reused.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/media/usb/uvc/uvc_ctrl.c

@@ -723,8 +723,7 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 };
 
-static const struct uvc_control_mapping uvc_ctrl_mappings_uvc11[] = {
-	{
+static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc11 = {
 	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
 	.entity		= UVC_GUID_UVC_PROCESSING,
 	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
@@ -735,11 +734,14 @@ static const struct uvc_control_mapping uvc_ctrl_mappings_uvc11[] = {
 	.menu_info	= power_line_frequency_controls,
 	.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
 				  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
-	},
 };
 
-static const struct uvc_control_mapping uvc_ctrl_mappings_uvc15[] = {
-	{
+static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc11[] = {
+	&uvc_ctrl_power_line_mapping_uvc11,
+	NULL, /* Sentinel */
+};
+
+static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc15 = {
 	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
 	.entity		= UVC_GUID_UVC_PROCESSING,
 	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
@@ -750,7 +752,11 @@ static const struct uvc_control_mapping uvc_ctrl_mappings_uvc15[] = {
 	.menu_info	= power_line_frequency_controls,
 	.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_AUTO,
 				  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
-	},
+};
+
+static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc15[] = {
+	&uvc_ctrl_power_line_mapping_uvc15,
+	NULL, /* Sentinel */
 };
 
 /* ------------------------------------------------------------------------
@@ -2506,8 +2512,7 @@ static void uvc_ctrl_prune_entity(struct uvc_device *dev,
 static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
 			       struct uvc_control *ctrl)
 {
-	const struct uvc_control_mapping *mappings;
-	unsigned int num_mappings;
+	const struct uvc_control_mapping **mappings;
 	unsigned int i;
 
 	/*
@@ -2574,16 +2579,11 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
 	}
 
 	/* Finally process version-specific mappings. */
-	if (chain->dev->uvc_version < 0x0150) {
-		mappings = uvc_ctrl_mappings_uvc11;
-		num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc11);
-	} else {
-		mappings = uvc_ctrl_mappings_uvc15;
-		num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc15);
-	}
+	mappings = chain->dev->uvc_version < 0x0150
+		 ? uvc_ctrl_mappings_uvc11 : uvc_ctrl_mappings_uvc15;
 
-	for (i = 0; i < num_mappings; ++i) {
-		const struct uvc_control_mapping *mapping = &mappings[i];
+	for (i = 0; mappings[i]; ++i) {
+		const struct uvc_control_mapping *mapping = mappings[i];
 
 		if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
 		    ctrl->info.selector == mapping->selector)