linux-kernel - [PATCH 1/6] media: uvcvideo: Add UVC_CTRL_FLAG_ENTITY_GET

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Date:   Thu, 22 Oct 2020 15:37:48 +0200
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     tfiga@...omium.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 1/6] media: uvcvideo: Add UVC_CTRL_FLAG_ENTITY_GET_INFO

This flag allows controls to get their properties from an entity defined
function instead of via a query to the USB device.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++--
 drivers/media/usb/uvc/uvcvideo.h | 3 +++
 include/uapi/linux/uvcvideo.h    | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index f479d8971dfb..7acdc055613b 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1708,8 +1708,13 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
 	if (data == NULL)
 		return -ENOMEM;
 
-	ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
-			     info->selector, data, 1);
+	if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_INFO)
+		ret = ctrl->entity->get_info ?
+			ctrl->entity->get_info(ctrl->entity, ctrl->info.selector, data) :
+			-EINVAL;
+	else
+		ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
+				     info->selector, data, 1);
 	if (!ret)
 		info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
 				UVC_CTRL_FLAG_GET_CUR : 0)
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index a3dfacf069c4..08922d889bb6 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -353,6 +353,9 @@ struct uvc_entity {
 	u8 bNrInPins;
 	u8 *baSourceID;
 
+	int (*get_info)(struct uvc_entity *entity, u8 cs, u8 *caps);
+	int (*get_cur)(struct uvc_entity *entity, u8 cs, void *data, u16 size);
+
 	unsigned int ncontrols;
 	struct uvc_control *controls;
 };
diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
index f80f05b3c423..69b636290c31 100644
--- a/include/uapi/linux/uvcvideo.h
+++ b/include/uapi/linux/uvcvideo.h
@@ -30,6 +30,8 @@
 #define UVC_CTRL_FLAG_AUTO_UPDATE	(1 << 7)
 /* Control supports asynchronous reporting */
 #define UVC_CTRL_FLAG_ASYNCHRONOUS	(1 << 8)
+/* Entity queries */
+#define UVC_CTRL_FLAG_ENTITY_GET_INFO	(1 << 9)
 
 #define UVC_CTRL_FLAG_GET_RANGE \
 	(UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
-- 
2.29.0.rc1.297.gfa9743e501-goog