From 5d0360a4f027576e5419d4a7c711c9ca0f1be8ca Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Mon, 21 Jul 2014 10:45:42 -0300 Subject: [PATCH] [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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-ctrls.c | 47 +++++++++++++++--------------------- include/media/v4l2-ctrls.h | 24 ++++++++++++++++++ 2 files changed, 44 insertions(+), 27 deletions(-) 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 @@ static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, 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 @@ EXPORT_SYMBOL(v4l2_subdev_s_ctrl); 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 @@ static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val) 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); -- 2.7.4