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Message-Id: <20180710080114.31469-2-paul.kocialkowski@bootlin.com>
Date: Tue, 10 Jul 2018 10:00:53 +0200
From: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Chen-Yu Tsai <wens@...e.org>,
Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
Marco Franchi <marco.franchi@....com>,
Icenowy Zheng <icenowy@...c.io>,
Hans Verkuil <hverkuil@...all.nl>,
Keiichi Watanabe <keiichiw@...omium.org>,
Jonathan Corbet <corbet@....net>,
Smitha T Murthy <smitha.t@...sung.com>,
Tom Saeger <tom.saeger@...cle.com>,
Andrzej Hajda <a.hajda@...sung.com>,
"David S . Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
Arnd Bergmann <arnd@...db.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
Jacob Chen <jacob-chen@...wrt.com>,
Neil Armstrong <narmstrong@...libre.com>,
Benoit Parrot <bparrot@...com>,
Todor Tomov <todor.tomov@...aro.org>,
Alexandre Courbot <acourbot@...omium.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Pawel Osciak <posciak@...omium.org>,
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>,
linux-sunxi@...glegroups.com,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Hugues Fruchet <hugues.fruchet@...com>,
Randy Li <ayaka@...lik.info>,
Hans Verkuil <hans.verkuil@...co.com>
Subject: [PATCH v5 01/22] v4l2-ctrls: add v4l2_ctrl_request_hdl_find/put/ctrl_find functions
From: Hans Verkuil <hverkuil@...all.nl>
If a driver needs to find/inspect the controls set in a request then
it can use these functions.
E.g. to check if a required control is set in a request use this in the
req_validate() implementation:
int res = -EINVAL;
hdl = v4l2_ctrl_request_hdl_find(req, parent_hdl);
if (hdl) {
if (v4l2_ctrl_request_hdl_ctrl_find(hdl, ctrl_id))
res = 0;
v4l2_ctrl_request_hdl_put(hdl);
}
return res;
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
---
drivers/media/v4l2-core/v4l2-ctrls.c | 25 ++++++++++++++++
include/media/v4l2-ctrls.h | 44 +++++++++++++++++++++++++++-
2 files changed, 68 insertions(+), 1 deletion(-)
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 86a6ae54ccaa..198b7e924d21 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2976,6 +2976,31 @@ static const struct media_request_object_ops req_ops = {
.release = v4l2_ctrl_request_release,
};
+struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
+ struct v4l2_ctrl_handler *parent)
+{
+ struct media_request_object *obj;
+
+ if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
+ req->state != MEDIA_REQUEST_STATE_QUEUED))
+ return NULL;
+
+ obj = media_request_object_find(req, &req_ops, parent);
+ if (obj)
+ return container_of(obj, struct v4l2_ctrl_handler, req_obj);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
+
+struct v4l2_ctrl *
+v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
+{
+ struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
+
+ return (ref && ref->req == ref) ? ref : NULL;
+}
+EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
+
static int v4l2_ctrl_request_bind(struct media_request *req,
struct v4l2_ctrl_handler *hdl,
struct v4l2_ctrl_handler *from)
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index de70cc3a1b80..34ee3167d7dd 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -1111,7 +1111,49 @@ void v4l2_ctrl_request_setup(struct media_request *req,
* request object.
*/
void v4l2_ctrl_request_complete(struct media_request *req,
- struct v4l2_ctrl_handler *hdl);
+ struct v4l2_ctrl_handler *parent);
+
+/**
+ * v4l2_ctrl_request_hdl_find - Find the control handler in the request
+ *
+ * @req: The request
+ * @parent: The parent control handler ('priv' in media_request_object_find())
+ *
+ * This function finds the control handler in the request. It may return
+ * NULL if not found. When done, you must call v4l2_ctrl_request_put_hdl()
+ * with the returned handler pointer.
+ *
+ * If the request is not in state VALIDATING or QUEUED, then this function
+ * will always return NULL.
+ */
+struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
+ struct v4l2_ctrl_handler *parent);
+
+/**
+ * v4l2_ctrl_request_hdl_put - Put the control handler
+ *
+ * @hdl: Put this control handler
+ *
+ * This function released the control handler previously obtained from'
+ * v4l2_ctrl_request_hdl_find().
+ */
+static inline void v4l2_ctrl_request_hdl_put(struct v4l2_ctrl_handler *hdl)
+{
+ if (hdl)
+ media_request_object_put(&hdl->req_obj);
+}
+
+/**
+ * v4l2_ctrl_request_ctrl_find() - Find a control with the given ID.
+ *
+ * @hdl: The control handler from the request.
+ * @id: The ID of the control to find.
+ *
+ * This function returns a pointer to the control if this control is
+ * part of the request or NULL otherwise.
+ */
+struct v4l2_ctrl *
+v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
/* Helpers for ioctl_ops */
--
2.17.1
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