linux-kernel - [PATCH 3/4] media: uvcvideo: Announce deprecation intentions for UVCIOC_CTRL

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Message-Id: <20251117-uvcdynctrl-v1-3-aed70eadf3d8@chromium.org>
Date: Mon, 17 Nov 2025 20:14:18 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hans de Goede <hansg@...nel.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 3/4] media: uvcvideo: Announce deprecation intentions for
 UVCIOC_CTRL_MAP

The UVCIOC_CTRL_MAP lets userspace create a mapping for a custom
control.

This mapping is usually created by the uvcdynctrl userspace utility. We
would like to get the mappings into the driver instead.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 Documentation/userspace-api/media/drivers/uvcvideo.rst | 2 ++
 drivers/media/usb/uvc/uvc_v4l2.c                       | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/Documentation/userspace-api/media/drivers/uvcvideo.rst b/Documentation/userspace-api/media/drivers/uvcvideo.rst
index dbb30ad389ae4d53bc734b4269ebea20ecdd7535..b09d2f8ba66ecde67f1e35fd77858a505ad44eb1 100644
--- a/Documentation/userspace-api/media/drivers/uvcvideo.rst
+++ b/Documentation/userspace-api/media/drivers/uvcvideo.rst
@@ -109,6 +109,8 @@ IOCTL reference
 UVCIOC_CTRL_MAP - Map a UVC control to a V4L2 control
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+**This IOCTL is deprecated and will be eventually removed**
+
 Argument: struct uvc_xu_control_mapping
 
 **Description**:
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 9e4a251eca88085a1b4e0e854370015855be92ee..03c64b5698bf4331fed8437fa6e9c726a07450bd 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1044,6 +1044,8 @@ static long uvc_ioctl_default(struct file *file, void *priv, bool valid_prio,
 	switch (cmd) {
 	/* Dynamic controls. */
 	case UVCIOC_CTRL_MAP:
+		pr_warn_once("uvcvideo: " DEPRECATED
+			     "UVCIOC_CTRL_MAP ioctl will be eventually removed.\n");
 		return uvc_ioctl_xu_ctrl_map(chain, arg);
 
 	case UVCIOC_CTRL_QUERY:
@@ -1158,6 +1160,8 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
 
 	switch (cmd) {
 	case UVCIOC_CTRL_MAP32:
+		pr_warn_once("uvcvideo: " DEPRECATED
+			     "UVCIOC_CTRL_MAP32 ioctl will be eventually removed.\n");
 		ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
 		if (ret)
 			break;

-- 
2.52.0.rc1.455.g30608eb744-goog