linux-kernel - [PATCH 1/1] x86: Fix reading the current exposure value of UVC

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Date:	Sun, 18 Oct 2015 17:01:26 -0400
From:	"Anton V. Shokurov" <shokurov.anton.v@...dex.ru>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"Anton V . Shokurov" <shokurov.anton.v@...dex.ru>
Subject: [PATCH 1/1] x86: Fix reading the current exposure value of UVC

V4L2_CID_EXPOSURE_ABSOLUTE property does not return an updated value when
autoexposure (V4L2_CID_EXPOSURE_AUTO) is turned on. This patch fixes this
issue by adding the UVC_CTRL_FLAG_AUTO_UPDATE flag.

Tested on a C920 camera.

Signed-off-by: Anton V. Shokurov <shokurov.anton.v@...dex.ru>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 3e59b28..c2ee6e3 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -227,7 +227,8 @@ static struct uvc_control_info uvc_ctrls[] = {
 		.size		= 4,
 		.flags		= UVC_CTRL_FLAG_SET_CUR
 				| UVC_CTRL_FLAG_GET_RANGE
-				| UVC_CTRL_FLAG_RESTORE,
+				| UVC_CTRL_FLAG_RESTORE
+				| UVC_CTRL_FLAG_AUTO_UPDATE,
 	},
 	{
 		.entity		= UVC_GUID_UVC_CAMERA,
-- 
2.6.0

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