[PATCH v3 2/4] media: uvcvideo: Announce deprecation intentions for UVCIOC_CTRL_MAP

[Ricardo Ribalda <ribalda@chromium.org>]

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.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.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 dbb30ad389ae..b09d2f8ba66e 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 d5860661c115..f9049e9c0d3a 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1046,6 +1046,8 @@ 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:
@@ -1160,6 +1162,8 @@ 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;

-- 
2.53.0.851.ga537e3e6e9-goog