[media] v4l2-ctrls: add support for setting string controls
Rather than always having to use a v4l2_ext_control struct to set
a control value from within a driver, switch to just setting the
new value. This is faster and it makes it possible to set more
complex types such as a string control as is added by this
patch.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 004e7e8..5db0385 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -3121,26 +3121,22 @@
struct v4l2_ctrl *master = ctrl->cluster[0];
int i;
- /* Compound controls are not supported. The user_to_new() and
- * cur_to_user() calls below would need to be modified not to access
- * userspace memory when called from set_ctrl().
- */
- if (ctrl->is_ptr)
- return -EINVAL;
-
/* Reset the 'is_new' flags of the cluster */
for (i = 0; i < master->ncontrols; i++)
if (master->cluster[i])
master->cluster[i]->is_new = 0;
+ if (c)
+ user_to_new(c, ctrl);
+
/* For autoclusters with volatiles that are switched from auto to
manual mode we have to update the current volatile values since
those will become the initial manual values after such a switch. */
if (master->is_auto && master->has_volatiles && ctrl == master &&
- !is_cur_manual(master) && c->value == master->manual_mode_value)
+ !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
update_from_auto_cluster(master);
- user_to_new(c, ctrl);
+ ctrl->is_new = 1;
return try_or_set_cluster(fh, master, true, ch_flags);
}
@@ -3188,40 +3184,37 @@
int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
{
- struct v4l2_ext_control c;
- int rval;
-
lockdep_assert_held(ctrl->handler->lock);
/* It's a driver bug if this happens. */
WARN_ON(!ctrl->is_int);
- c.value = val;
- rval = set_ctrl(NULL, ctrl, &c, 0);
- if (!rval)
- cur_to_user(&c, ctrl);
-
- return rval;
+ ctrl->val = val;
+ return set_ctrl(NULL, ctrl, NULL, 0);
}
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
{
- struct v4l2_ext_control c;
- int rval;
-
lockdep_assert_held(ctrl->handler->lock);
/* It's a driver bug if this happens. */
WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
- c.value64 = val;
- rval = set_ctrl(NULL, ctrl, &c, 0);
- if (!rval)
- cur_to_user(&c, ctrl);
-
- return rval;
+ *ctrl->p_new.p_s64 = val;
+ return set_ctrl(NULL, ctrl, NULL, 0);
}
EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
+int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
+{
+ lockdep_assert_held(ctrl->handler->lock);
+
+ /* It's a driver bug if this happens. */
+ WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
+ strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
+ return set_ctrl(NULL, ctrl, NULL, 0);
+}
+EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
+
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 8c4edd6..d6540d2 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -737,6 +737,30 @@
return rval;
}
+/** __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string(). */
+int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s);
+
+/** v4l2_ctrl_s_ctrl_string() - Helper function to set a control's string value from within a driver.
+ * @ctrl: The control.
+ * @s: The new string.
+ *
+ * This set the control's new string safely by going through the control
+ * framework. This function will lock the control's handler, so it cannot be
+ * used from within the &v4l2_ctrl_ops functions.
+ *
+ * This function is for string type controls only.
+ */
+static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
+{
+ int rval;
+
+ v4l2_ctrl_lock(ctrl);
+ rval = __v4l2_ctrl_s_ctrl_string(ctrl, s);
+ v4l2_ctrl_unlock(ctrl);
+
+ return rval;
+}
+
/* Internal helper functions that deal with control events. */
extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);