linux-kernel - [PATCH AUTOSEL 6.6 129/294] media: uvcvideo: Handle uvc menu translation inside uvc_get_le

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Message-Id: <20250505225634.2688578-129-sashal@kernel.org>
Date: Mon,  5 May 2025 18:53:49 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ricardo Ribalda <ribalda@...omium.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Yunke Cao <yunkec@...gle.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sasha Levin <sashal@...nel.org>,
	laurent.pinchart@...asonboard.com,
	mchehab@...nel.org,
	linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 129/294] media: uvcvideo: Handle uvc menu translation inside uvc_get_le_value

From: Ricardo Ribalda <ribalda@...omium.org>

[ Upstream commit 9109a0b4cb10fd681e9c6e9a4497a6fec5b91c39 ]

map->get() gets a value from an uvc_control in "UVC format" and converts
it to a value that can be consumed by v4l2.

Instead of using a special get function for V4L2_CTRL_TYPE_MENU, we
were converting from uvc_get_le_value in two different places.

Move the conversion to uvc_get_le_value().

Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Tested-by: Yunke Cao <yunkec@...gle.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
Link: https://lore.kernel.org/r/20250203-uvc-roi-v17-4-5900a9fed613@chromium.org
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 77 +++++++++++++-------------------
 1 file changed, 32 insertions(+), 45 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 028c4a5049af9..5926a9dfb0b1f 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -815,6 +815,25 @@ static inline void uvc_clear_bit(u8 *data, int bit)
 	data[bit >> 3] &= ~(1 << (bit & 7));
 }
 
+static s32 uvc_menu_to_v4l2_menu(struct uvc_control_mapping *mapping, s32 val)
+{
+	unsigned int i;
+
+	for (i = 0; BIT(i) <= mapping->menu_mask; ++i) {
+		u32 menu_value;
+
+		if (!test_bit(i, &mapping->menu_mask))
+			continue;
+
+		menu_value = uvc_mapping_get_menu_value(mapping, i);
+
+		if (menu_value == val)
+			return i;
+	}
+
+	return val;
+}
+
 /*
  * Extract the bit string specified by mapping->offset and mapping->size
  * from the little-endian data stored at 'data' and return the result as
@@ -849,6 +868,16 @@ static s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
 	if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 		value |= -(value & (1 << (mapping->size - 1)));
 
+	/* If it is a menu, convert from uvc to v4l2. */
+	if (mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
+		return value;
+
+	switch (query) {
+	case UVC_GET_CUR:
+	case UVC_GET_DEF:
+		return uvc_menu_to_v4l2_menu(mapping, value);
+	}
+
 	return value;
 }
 
@@ -1013,32 +1042,6 @@ static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain,
 	return 0;
 }
 
-static s32 __uvc_ctrl_get_value(struct uvc_control_mapping *mapping,
-				const u8 *data)
-{
-	s32 value = mapping->get(mapping, UVC_GET_CUR, data);
-
-	if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
-		unsigned int i;
-
-		for (i = 0; BIT(i) <= mapping->menu_mask; ++i) {
-			u32 menu_value;
-
-			if (!test_bit(i, &mapping->menu_mask))
-				continue;
-
-			menu_value = uvc_mapping_get_menu_value(mapping, i);
-
-			if (menu_value == value) {
-				value = i;
-				break;
-			}
-		}
-	}
-
-	return value;
-}
-
 static int __uvc_ctrl_load_cur(struct uvc_video_chain *chain,
 			       struct uvc_control *ctrl)
 {
@@ -1089,8 +1092,8 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain,
 	if (ret < 0)
 		return ret;
 
-	*value = __uvc_ctrl_get_value(mapping,
-				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
+	*value = mapping->get(mapping, UVC_GET_CUR,
+			      uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
 
 	return 0;
 }
@@ -1240,7 +1243,6 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 {
 	struct uvc_control_mapping *master_map = NULL;
 	struct uvc_control *master_ctrl = NULL;
-	unsigned int i;
 
 	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
 	v4l2_ctrl->id = mapping->id;
@@ -1283,21 +1285,6 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		v4l2_ctrl->minimum = ffs(mapping->menu_mask) - 1;
 		v4l2_ctrl->maximum = fls(mapping->menu_mask) - 1;
 		v4l2_ctrl->step = 1;
-
-		for (i = 0; BIT(i) <= mapping->menu_mask; ++i) {
-			u32 menu_value;
-
-			if (!test_bit(i, &mapping->menu_mask))
-				continue;
-
-			menu_value = uvc_mapping_get_menu_value(mapping, i);
-
-			if (menu_value == v4l2_ctrl->default_value) {
-				v4l2_ctrl->default_value = i;
-				break;
-			}
-		}
-
 		return 0;
 
 	case V4L2_CTRL_TYPE_BOOLEAN:
@@ -1580,7 +1567,7 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain,
 		uvc_ctrl_set_handle(handle, ctrl, NULL);
 
 	list_for_each_entry(mapping, &ctrl->info.mappings, list) {
-		s32 value = __uvc_ctrl_get_value(mapping, data);
+		s32 value = mapping->get(mapping, UVC_GET_CUR, data);
 
 		/*
 		 * handle may be NULL here if the device sends auto-update
-- 
2.39.5