linux-kernel - [PATCH 2/2] Made recommended changes

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Message-Id: <20240405-uvc-fix-relative-ptz-speed-v1-2-c32cdb2a899d@securitylive.com>
Date: Fri, 05 Apr 2024 02:06:27 -0500
From: John Bauer via B4 Relay <devnull+johnebgood.securitylive.com@...nel.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linh.tp.vu@...il.com, ribalda@...omium.org, soyer@....hu, 
 John Bauer <johnebgood@...uritylive.com>
Subject: [PATCH 2/2] Made recommended changes

From: John Bauer <johnebgood@...uritylive.com>

Moved control checks to helper function and removed
dead code per recommendations from Ricardo.

Signed-off-by: John Bauer <johnebgood@...uritylive.com>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 53 +++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 28 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index b389ab3ee05d..34a9a29b0754 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -441,7 +441,6 @@ static s32 uvc_ctrl_get_rel_speed(struct uvc_control_mapping *mapping,
 		return (rel == 0) ? 0 : (rel > 0 ? data[first+1]
 						 : -data[first+1]);
 	case UVC_GET_MIN:
-		return -data[first+1];
 	case UVC_GET_MAX:
 	case UVC_GET_RES:
 	case UVC_GET_DEF:
@@ -1233,6 +1232,17 @@ static u32 uvc_get_ctrl_bitmap(struct uvc_control *ctrl,
 	return ~0;
 }
 
+static bool is_relative_ptz_ctrl(__u32 ctrl_id)
+{
+	switch (ctrl_id) {
+	case V4L2_CID_ZOOM_CONTINUOUS:
+	case V4L2_CID_PAN_SPEED:
+	case V4L2_CID_TILT_SPEED:
+		return true;
+	}
+	return false;
+}
+
 static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	struct uvc_control *ctrl,
 	struct uvc_control_mapping *mapping,
@@ -1322,30 +1332,23 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		break;
 	}
 
+	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
+		v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
+				     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
+
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) {
-		switch (v4l2_ctrl->id) {
-		case V4L2_CID_ZOOM_CONTINUOUS:
-		case V4L2_CID_PAN_SPEED:
-		case V4L2_CID_TILT_SPEED:
-			/*
-			 * For the relative speed implementation the minimum
-			 * value cannot be probed so it becomes the additive
-			 * inverse of maximum.
-			 */
-			v4l2_ctrl->minimum = -1 * mapping->get(mapping, UVC_GET_MAX,
-						uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
-			break;
-		default:
+		/*
+		 * For the relative speed implementation the minimum
+		 * value cannot be probed so it becomes the additive
+		 * inverse of maximum.
+		 */
+		if (is_relative_ptz_ctrl(v4l2_ctrl->id))
+			v4l2_ctrl->minimum = -v4l2_ctrl->maximum;
+		else
 			v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
 						uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
-			break;
-		}
 	}
 
-	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
-		v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
-				     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
-
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
 		v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
 				  uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
@@ -1936,14 +1939,8 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 		 * value cannot be probed so it becomes the additive
 		 * inverse of maximum.
 		 */
-		switch (xctrl->id) {
-		case V4L2_CID_ZOOM_CONTINUOUS:
-		case V4L2_CID_PAN_SPEED:
-		case V4L2_CID_TILT_SPEED:
-			min = max * -1;
-		default:
-			break;
-		}
+		if (is_relative_ptz_ctrl(xctrl->id))
+			min = -max;
 
 		step = mapping->get(mapping, UVC_GET_RES,
 				    uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));

-- 
2.34.1