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[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>
This commit is contained in:
Hans Verkuil 2014-07-21 10:45:42 -03:00 committed by Mauro Carvalho Chehab
parent 592d1349f7
commit 5d0360a4f0
2 changed files with 44 additions and 27 deletions
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47
drivers/media/v4l2-core/v4l2-ctrls.c
View File

@ -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)

24
include/media/v4l2-ctrls.h
View File

@ -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);