From: Hans Verkuil <hans.verk...@cisco.com>
Add the two core request functions:
v4l2_ctrl_request_setup() applies the contents of the request
to the current driver state.
v4l2_ctrl_request_complete() marks the request complete. After
this the contents is fixed.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
drivers/media/v4l2-core/v4l2-ctrls.c | 172 +++++++++++++++++++++++++++++++++++
include/media/v4l2-ctrls.h | 9 ++
2 files changed, 181 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c
b/drivers/media/v4l2-core/v4l2-ctrls.c
index 80714c5bad8b..62f91c0f1e5f 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1781,6 +1781,14 @@ static void new_to_req(struct v4l2_ctrl_ref *ref)
ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
}
+/* Copy the request value to the new value */
+static void req_to_new(struct v4l2_ctrl_ref *ref)
+{
+ if (!ref)
+ return;
+ ptr_to_ptr(ref->ctrl, ref->p_req, ref->ctrl->p_new);
+}
+
/* Return non-zero if one or more of the controls in the cluster has a new
value that differs from the current value. */
static int cluster_changed(struct v4l2_ctrl *master)
@@ -2831,6 +2839,78 @@ int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct
v4l2_querymenu *qm)
}
EXPORT_SYMBOL(v4l2_querymenu);
+static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_handler *from,
+ bool (*filter)(const struct v4l2_ctrl *ctrl))
+{
+ struct v4l2_ctrl_ref *ref;
+ int err;
+
+ if (WARN_ON(!hdl || hdl == from))
+ return -EINVAL;
+
+ if (hdl->error)
+ return hdl->error;
+
+ WARN_ON(hdl->lock != &hdl->_lock);
+ v4l2_ctrl_handler_free(hdl);
+ err = v4l2_ctrl_handler_init(hdl, (from->nr_of_buckets - 1) * 8);
+ if (err)
+ return err;
+ if (!from)
+ return 0;
+
+ mutex_lock(from->lock);
+ list_for_each_entry(ref, &from->ctrl_refs, node) {
+ struct v4l2_ctrl *ctrl = ref->ctrl;
+ struct v4l2_ctrl_ref *new_ref;
+
+ /* Skip refs inherited from other devices */
+ if (ref->from_other_dev)
+ continue;
+ /* And buttons and control classes */
+ if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
+ ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
+ continue;
+ /* Filter any unwanted controls */
+ if (filter && !filter(ctrl))
+ continue;
+ err = handler_new_ref(hdl, ctrl, &new_ref, false);
+ if (err)
+ break;
+ if (from->req_obj.req)
+ ptr_to_ptr(ctrl, ref->p_req, new_ref->p_req);
+ else
+ ptr_to_ptr(ctrl, ctrl->p_cur, new_ref->p_req);
+ }
+ mutex_unlock(from->lock);
+ return err;
+}
+
+static void v4l2_ctrl_request_release(struct media_request_object *obj)
+{
+ struct v4l2_ctrl_handler *hdl =
+ container_of(obj, struct v4l2_ctrl_handler, req_obj);
+
+ v4l2_ctrl_handler_free(hdl);
+ kfree(hdl);
+}
+
+static const struct media_request_object_ops req_ops = {
+ .release = v4l2_ctrl_request_release,
+};
+
+static int v4l2_ctrl_request_bind(struct media_request *req,
+ struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ctrl_handler *from,
+ bool (*filter)(const struct v4l2_ctrl *ctrl))
+{
+ int ret = v4l2_ctrl_request_clone(hdl, from, filter);
+
+ if (!ret)
+ media_request_object_bind(req, &req_ops, from, &hdl->req_obj);
+ return ret;
+}
/* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
@@ -3458,6 +3538,98 @@ int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl,
const char *s)
}
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
+void v4l2_ctrl_request_complete(struct media_request *req,
+ struct v4l2_ctrl_handler *hdl)
+{
+ struct media_request_object *obj;
+
+ if (!req || !hdl)
+ return;
+
+ obj = media_request_object_find(req, &req_ops, hdl);
+ if (!obj)
+ return;
+
+ media_request_object_complete(obj);
+ media_request_object_put(obj);
+}
+EXPORT_SYMBOL(v4l2_ctrl_request_complete);
+
+void v4l2_ctrl_request_setup(struct media_request *req,
+ struct v4l2_ctrl_handler *hdl)
+{
+ struct media_request_object *obj;
+ struct v4l2_ctrl_ref *ref;
+
+ if (!req || !hdl)
+ return;
+
+ obj = media_request_object_find(req, &req_ops, hdl);
+ if (!obj)
+ return;
+ if (obj->completed) {
+ media_request_object_put(obj);
+ return;
+ }
+ hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
+
+ mutex_lock(hdl->lock);
+
+ list_for_each_entry(ref, &hdl->ctrl_refs, node)
+ ref->done = false;
+
+ list_for_each_entry(ref, &hdl->ctrl_refs, node) {
+ struct v4l2_ctrl *ctrl = ref->ctrl;
+ struct v4l2_ctrl *master = ctrl->cluster[0];
+ int i;
+
+ /* Skip if this control was already handled by a cluster. */
+ /* Skip button controls and read-only controls. */
+ if (ref->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
+ (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
+ continue;
+
+ v4l2_ctrl_lock(master);
+ for (i = 0; i < master->ncontrols; i++) {
+ if (master->cluster[i]) {
+ struct v4l2_ctrl_ref *r =
+ find_ref(hdl, master->cluster[i]->id);
+
+ req_to_new(r);
+ master->cluster[i]->is_new = 1;
+ r->done = true;
+ }
+ }
+ /*
+ * For volatile autoclusters that are currently in auto mode
+ * we need to discover if it will be set to manual mode.
+ * If so, then we have to copy the current volatile values
+ * first since those will become the new manual values (which
+ * may be overwritten by explicit new values from this set
+ * of controls).
+ */
+ if (master->is_auto && master->has_volatiles &&
+ !is_cur_manual(master)) {
+ s32 new_auto_val = *master->p_new.p_s32;
+
+ /*
+ * If the new value == the manual value, then copy
+ * the current volatile values.
+ */
+ if (new_auto_val == master->manual_mode_value)
+ update_from_auto_cluster(master);
+ }
+
+ try_or_set_cluster(NULL, master, true, 0);
+
+ v4l2_ctrl_unlock(master);
+ }
+
+ mutex_unlock(hdl->lock);
+ media_request_object_put(obj);
+}
+EXPORT_SYMBOL(v4l2_ctrl_request_setup);
+
void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify,
void *priv)
{
if (ctrl == NULL)
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 89a985607126..378d4f05c160 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -250,6 +250,9 @@ struct v4l2_ctrl {
* ``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``.
* @from_other_dev: If true, then @ctrl was defined in another
* device then the &struct v4l2_ctrl_handler.
+ * @done: If true, then this control reference is part of a
+ * control cluster that was already set while applying
+ * the controls in this media request object.
* @p_req: The request value. Only used if the control handler
* is bound to a media request.
*
@@ -263,6 +266,7 @@ struct v4l2_ctrl_ref {
struct v4l2_ctrl *ctrl;
struct v4l2_ctrl_helper *helper;
bool from_other_dev;
+ bool done;
union v4l2_ctrl_ptr p_req;
};
@@ -1059,6 +1063,11 @@ int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
*/
__poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
+void v4l2_ctrl_request_setup(struct media_request *req,
+ struct v4l2_ctrl_handler *hdl);
+void v4l2_ctrl_request_complete(struct media_request *req,
+ struct v4l2_ctrl_handler *hdl);
+
/* Helpers for ioctl_ops */
/**
--
2.16.1
