linux-kernel - [PATCH 10/10] media: uvcvideo: Populate only active control classes

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Date:   Thu, 11 Mar 2021 13:20:40 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, senozhatsky@...omium.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 10/10] media: uvcvideo: Populate only active control classes

Do not create Control Classes for empty classes.

Fixes v4l2-compliance:

Control ioctls (Input 0):
	                fail: v4l2-test-controls.cpp(255): no controls in class 009d0000
	test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: FAIL

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c   | 11 +++++++++++
 drivers/media/usb/uvc/uvc_driver.c |  1 -
 drivers/media/usb/uvc/uvcvideo.h   |  1 -
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 433342efc63f..5efbb3b5aa5b 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2128,6 +2128,17 @@ static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
 	if (map->set == NULL)
 		map->set = uvc_set_le_value;
 
+	switch (V4L2_CTRL_ID2WHICH(map->id)) {
+	case V4L2_CTRL_ID2WHICH(V4L2_CID_CAMERA_CLASS):
+		dev->ctrl_class_unit->ctrl_class.bmControls[0] |=
+						BIT(UVC_CC_CAMERA_CLASS);
+		break;
+	case V4L2_CTRL_ID2WHICH(V4L2_CID_USER_CLASS):
+		dev->ctrl_class_unit->ctrl_class.bmControls[0] |=
+						BIT(UVC_CC_USER_CLASS);
+		break;
+	}
+
 	list_add_tail(&map->list, &ctrl->info.mappings);
 	uvc_dbg(dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
 		map->name, ctrl->info.entity, ctrl->info.selector);
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 996e8bd06ac5..4f368ab3a1f1 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1501,7 +1501,6 @@ static int uvc_ctrl_class_parse(struct uvc_device *dev)
 
 	unit->ctrl_class.bControlSize = 1;
 	unit->ctrl_class.bmControls = (u8 *)unit + sizeof(*unit);
-	unit->ctrl_class.bmControls[0] = (1 << (UVC_CC_LAST_CLASS + 1)) - 1;
 	unit->get_info = uvc_ctrl_class_get_info;
 	strncpy(unit->name, "Control Class", sizeof(unit->name) - 1);
 
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 1d59ac10c2eb..cc573d63e459 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -186,7 +186,6 @@
  */
 #define UVC_CC_CAMERA_CLASS	0
 #define UVC_CC_USER_CLASS	1
-#define UVC_CC_LAST_CLASS	UVC_CC_USER_CLASS
 
 /* ------------------------------------------------------------------------
  * Driver specific constants.
-- 
2.31.0.rc2.261.g7f71774620-goog