linux-kernel - [PATCH v16 06/18] media: uvcvideo: Handle uvc menu translation inside uvc_set_le

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Message-Id: <20241210-uvc-roi-v16-6-e8201f7e8e57@chromium.org>
Date: Tue, 10 Dec 2024 09:42:42 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Hans de Goede <hdegoede@...hat.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: Yunke Cao <yunkec@...omium.org>, linux-media@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>, 
 Yunke Cao <yunkec@...gle.com>
Subject: [PATCH v16 06/18] media: uvcvideo: Handle uvc menu translation
 inside uvc_set_le_value

Be consistent with uvc_get_le_value() and do the menu translation there.

Note that in this case, the refactor does not provide much... but
consistency is a nice feature.

Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Tested-by: Yunke Cao <yunkec@...gle.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 77f7058ec966..987a9700bed9 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -939,14 +939,22 @@ static void uvc_set_le_value(struct uvc_control_mapping *mapping,
 	int offset = mapping->offset;
 	u8 mask;
 
-	/*
-	 * According to the v4l2 spec, writing any value to a button control
-	 * should result in the action belonging to the button control being
-	 * triggered. UVC devices however want to see a 1 written -> override
-	 * value.
-	 */
-	if (mapping->v4l2_type == V4L2_CTRL_TYPE_BUTTON)
+	switch (mapping->v4l2_type) {
+	case V4L2_CTRL_TYPE_MENU:
+		value = uvc_mapping_get_menu_value(mapping, value);
+		break;
+	case V4L2_CTRL_TYPE_BUTTON:
+		/*
+		 * According to the v4l2 spec, writing any value to a button
+		 * control should result in the action belonging to the button
+		 * control being triggered. UVC devices however want to see a 1
+		 * written -> override value.
+		 */
 		value = -1;
+		break;
+	default:
+		break;
+	}
 
 	data += offset / 8;
 	offset &= 7;
@@ -1988,23 +1996,23 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 		if (!test_bit(xctrl->value, &mapping->menu_mask))
 			return -EINVAL;
 
-		value = uvc_mapping_get_menu_value(mapping, xctrl->value);
-
 		/*
 		 * Valid menu indices are reported by the GET_RES request for
 		 * UVC controls that support it.
 		 */
 		if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK) {
+			int val = uvc_mapping_get_menu_value(mapping,
+							     xctrl->value);
 			if (!ctrl->cached) {
 				ret = uvc_ctrl_populate_cache(chain, ctrl);
 				if (ret < 0)
 					return ret;
 			}
 
-			if (!(uvc_get_ctrl_bitmap(ctrl, mapping) & value))
+			if (!(uvc_get_ctrl_bitmap(ctrl, mapping) & val))
 				return -EINVAL;
 		}
-
+		value = xctrl->value;
 		break;
 
 	default:

-- 
2.47.0.338.g60cca15819-goog