media: v4l2-ctrls: support g/s_ext_ctrls for requests

The v4l2_g/s_ext_ctrls functions now support control handlers that
represent requests.

The v4l2_ctrls_find_req_obj() function is responsible for finding the
request from the fd.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 130 insertions, 8 deletions

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 89e7bfee108f..6d34d7a6f235 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -3140,7 +3140,8 @@ static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
 }
 
 /* Get extended controls. Allocates the helpers array if needed. */
-int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
+				   struct v4l2_ext_controls *cs)
 {
 	struct v4l2_ctrl_helper helper[4];
 	struct v4l2_ctrl_helper *helpers = helper;
@@ -3220,6 +3221,83 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
 		kvfree(helpers);
 	return ret;
 }
+
+static struct media_request_object *
+v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
+			struct media_request *req, bool set)
+{
+	struct media_request_object *obj;
+	struct v4l2_ctrl_handler *new_hdl;
+	int ret;
+
+	if (IS_ERR(req))
+		return ERR_CAST(req);
+
+	if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
+		return ERR_PTR(-EBUSY);
+
+	obj = media_request_object_find(req, &req_ops, hdl);
+	if (obj)
+		return obj;
+	if (!set)
+		return ERR_PTR(-ENOENT);
+
+	new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
+	if (!new_hdl)
+		return ERR_PTR(-ENOMEM);
+
+	obj = &new_hdl->req_obj;
+	ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
+	if (!ret)
+		ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
+	if (ret) {
+		kfree(new_hdl);
+
+		return ERR_PTR(ret);
+	}
+
+	media_request_object_get(obj);
+	return obj;
+}
+
+int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
+		     struct v4l2_ext_controls *cs)
+{
+	struct media_request_object *obj = NULL;
+	int ret;
+
+	if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
+		struct media_request *req;
+
+		if (!mdev || cs->request_fd < 0)
+			return -EINVAL;
+
+		req = media_request_get_by_fd(mdev, cs->request_fd);
+		if (IS_ERR(req))
+			return PTR_ERR(req);
+
+		if (req->state != MEDIA_REQUEST_STATE_IDLE &&
+		    req->state != MEDIA_REQUEST_STATE_COMPLETE) {
+			media_request_put(req);
+			return -EBUSY;
+		}
+
+		obj = v4l2_ctrls_find_req_obj(hdl, req, false);
+		/* Reference to the request held through obj */
+		media_request_put(req);
+		if (IS_ERR(obj))
+			return PTR_ERR(obj);
+
+		hdl = container_of(obj, struct v4l2_ctrl_handler,
+				   req_obj);
+	}
+
+	ret = v4l2_g_ext_ctrls_common(hdl, cs);
+
+	if (obj)
+		media_request_object_put(obj);
+	return ret;
+}
 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
 
 /* Helper function to get a single control */
@@ -3408,9 +3486,9 @@ static void update_from_auto_cluster(struct v4l2_ctrl *master)
 }
 
 /* Try or try-and-set controls */
-static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
-			     struct v4l2_ext_controls *cs,
-			     bool set)
+static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
+				    struct v4l2_ctrl_handler *hdl,
+				    struct v4l2_ext_controls *cs, bool set)
 {
 	struct v4l2_ctrl_helper helper[4];
 	struct v4l2_ctrl_helper *helpers = helper;
@@ -3523,16 +3601,60 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
 	return ret;
 }
 
-int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+static int try_set_ext_ctrls(struct v4l2_fh *fh,
+			     struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
+			     struct v4l2_ext_controls *cs, bool set)
+{
+	struct media_request_object *obj = NULL;
+	struct media_request *req = NULL;
+	int ret;
+
+	if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
+		if (!mdev || cs->request_fd < 0)
+			return -EINVAL;
+
+		req = media_request_get_by_fd(mdev, cs->request_fd);
+		if (IS_ERR(req))
+			return PTR_ERR(req);
+
+		ret = media_request_lock_for_update(req);
+		if (ret) {
+			media_request_put(req);
+			return ret;
+		}
+
+		obj = v4l2_ctrls_find_req_obj(hdl, req, set);
+		/* Reference to the request held through obj */
+		media_request_put(req);
+		if (IS_ERR(obj)) {
+			media_request_unlock_for_update(req);
+			return PTR_ERR(obj);
+		}
+		hdl = container_of(obj, struct v4l2_ctrl_handler,
+				   req_obj);
+	}
+
+	ret = try_set_ext_ctrls_common(fh, hdl, cs, set);
+
+	if (obj) {
+		media_request_unlock_for_update(obj->req);
+		media_request_object_put(obj);
+	}
+
+	return ret;
+}
+
+int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
+		       struct v4l2_ext_controls *cs)
 {
-	return try_set_ext_ctrls(NULL, hdl, cs, false);
+	return try_set_ext_ctrls(NULL, hdl, mdev, cs, false);
 }
 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
 
 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
-					struct v4l2_ext_controls *cs)
+		     struct media_device *mdev, struct v4l2_ext_controls *cs)
 {
-	return try_set_ext_ctrls(fh, hdl, cs, true);
+	return try_set_ext_ctrls(fh, hdl, mdev, cs, true);
 }
 EXPORT_SYMBOL(v4l2_s_ext_ctrls);