2010-08-01 11:32:42 -06:00
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/*
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V4L2 controls support header.
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Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _V4L2_CTRLS_H
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#define _V4L2_CTRLS_H
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#include <linux/list.h>
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2010-11-19 07:20:06 -07:00
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#include <linux/videodev2.h>
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2010-08-01 11:32:42 -06:00
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/* forward references */
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2012-04-23 05:20:35 -06:00
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struct file;
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2010-08-01 11:32:42 -06:00
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struct v4l2_ctrl_handler;
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2011-06-14 07:04:06 -06:00
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struct v4l2_ctrl_helper;
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2010-08-01 11:32:42 -06:00
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struct v4l2_ctrl;
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struct video_device;
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struct v4l2_subdev;
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2011-06-13 15:55:58 -06:00
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struct v4l2_subscribed_event;
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2011-06-07 08:13:44 -06:00
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struct v4l2_fh;
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2012-01-27 12:18:42 -07:00
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struct poll_table_struct;
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2010-08-01 11:32:42 -06:00
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/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
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* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
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* for volatile (and usually read-only) controls such as a control
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* that returns the current signal strength which changes
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* continuously.
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* If not set, then the currently cached value will be returned.
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* @try_ctrl: Test whether the control's value is valid. Only relevant when
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* the usual min/max/step checks are not sufficient.
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* @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
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* ctrl->handler->lock is held when these ops are called, so no
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* one else can access controls owned by that handler.
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*/
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struct v4l2_ctrl_ops {
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int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
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int (*try_ctrl)(struct v4l2_ctrl *ctrl);
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int (*s_ctrl)(struct v4l2_ctrl *ctrl);
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};
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/** struct v4l2_ctrl - The control structure.
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* @node: The list node.
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2011-06-13 15:55:58 -06:00
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* @ev_subs: The list of control event subscriptions.
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2010-08-01 11:32:42 -06:00
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* @handler: The handler that owns the control.
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* @cluster: Point to start of cluster array.
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* @ncontrols: Number of controls in cluster array.
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* @done: Internal flag: set for each processed control.
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2011-01-11 10:45:03 -07:00
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* @is_new: Set when the user specified a new value for this control. It
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* is also set when called from v4l2_ctrl_handler_setup. Drivers
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* should never set this flag.
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2010-08-01 11:32:42 -06:00
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* @is_private: If set, then this control is private to its handler and it
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* will not be added to any other handlers. Drivers can set
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* this flag.
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2011-06-10 02:44:36 -06:00
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* @is_auto: If set, then this control selects whether the other cluster
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* members are in 'automatic' mode or 'manual' mode. This is
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* used for autogain/gain type clusters. Drivers should never
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* set this flag directly.
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[media] v4l2-ctrls: implement new volatile autocluster scheme
The problem tackled in this patch is how to handle volatile autoclusters
correctly. A volatile autocluster is a cluster of related controls where one
control is the control that toggles between manual and auto mode and the other
controls are the values for the manual mode. For example autogain and gain,
autoexposure and exposure, etc.
If the hardware lets you read out the automatically calculated manual values
while in automode, then those manual controls should be marked volatile.
gain value as calculated by the autogain circuitry, then you would mark the
gain control as volatile (i.e. continuously changing).
The question in such use cases is what to do when switching from the auto
mode to the manual mode. Should we switch to the last set manual values or
should the volatile values be copied and used as the initial manual values.
For example: suppose the mode is manual gain and gain is set to 5. Then
autogain is turned on and the gain is set by the hardware to 2. Finally
the user switches back to manual gain. What should the gain be? 2 or 5?
After a long discussion the decisions was made to keep the last value as
calculated by the auto mode (so 2 in the example above).
The reason is that webcams that do such things will adapt themselves to
the current light conditions and when you switch back to manual mode you
expect that you keep the same picture. If you would switch back to old
manual values, then that would give you a suddenly different picture,
which is jarring for the user.
Additionally, this would be difficult to implement in applications that
store and restore the control values at application exit and start.
If you want to keep the old manual values when you switch from auto to
manual, then there would have to be a way for applications to get hold
of those old values while in auto mode, but there isn't.
So this patch will do all the heavy lifting in v4l2-ctrls.c: if you go
from auto mode to manual mode and the manual controls are volatile, then
g_volatile_ctrl will be called to get the current values for the manual
controls before switching to manual mode.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-08-26 04:53:53 -06:00
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* @has_volatiles: If set, then one or more members of the cluster are volatile.
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* Drivers should never touch this flag.
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2011-06-10 02:44:36 -06:00
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* @manual_mode_value: If the is_auto flag is set, then this is the value
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* of the auto control that determines if that control is in
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* manual mode. So if the value of the auto control equals this
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* value, then the whole cluster is in manual mode. Drivers should
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* never set this flag directly.
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2010-08-01 11:32:42 -06:00
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* @ops: The control ops.
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* @id: The control ID.
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* @name: The control name.
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* @type: The control type.
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* @minimum: The control's minimum value.
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* @maximum: The control's maximum value.
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* @default_value: The control's default value.
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* @step: The control's step value for non-menu controls.
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* @menu_skip_mask: The control's skip mask for menu controls. This makes it
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* easy to skip menu items that are not valid. If bit X is set,
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* then menu item X is skipped. Of course, this only works for
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* menus with <= 32 menu items. There are no menus that come
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* close to that number, so this is OK. Should we ever need more,
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* then this will have to be extended to a u64 or a bit array.
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* @qmenu: A const char * array for all menu items. Array entries that are
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* empty strings ("") correspond to non-existing menu items (this
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* is in addition to the menu_skip_mask above). The last entry
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* must be NULL.
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* @flags: The control's flags.
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* @cur: The control's current value.
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* @val: The control's new s32 value.
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* @val64: The control's new s64 value.
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* @string: The control's new string value.
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* @priv: The control's private pointer. For use by the driver. It is
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* untouched by the control framework. Note that this pointer is
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* not freed when the control is deleted. Should this be needed
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* then a new internal bitfield can be added to tell the framework
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* to free this pointer.
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*/
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struct v4l2_ctrl {
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/* Administrative fields */
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struct list_head node;
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2011-06-13 15:55:58 -06:00
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struct list_head ev_subs;
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2010-08-01 11:32:42 -06:00
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struct v4l2_ctrl_handler *handler;
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struct v4l2_ctrl **cluster;
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unsigned ncontrols;
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unsigned int done:1;
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2011-01-11 10:45:03 -07:00
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unsigned int is_new:1;
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2010-08-01 11:32:42 -06:00
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unsigned int is_private:1;
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2011-06-10 02:44:36 -06:00
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unsigned int is_auto:1;
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[media] v4l2-ctrls: implement new volatile autocluster scheme
The problem tackled in this patch is how to handle volatile autoclusters
correctly. A volatile autocluster is a cluster of related controls where one
control is the control that toggles between manual and auto mode and the other
controls are the values for the manual mode. For example autogain and gain,
autoexposure and exposure, etc.
If the hardware lets you read out the automatically calculated manual values
while in automode, then those manual controls should be marked volatile.
gain value as calculated by the autogain circuitry, then you would mark the
gain control as volatile (i.e. continuously changing).
The question in such use cases is what to do when switching from the auto
mode to the manual mode. Should we switch to the last set manual values or
should the volatile values be copied and used as the initial manual values.
For example: suppose the mode is manual gain and gain is set to 5. Then
autogain is turned on and the gain is set by the hardware to 2. Finally
the user switches back to manual gain. What should the gain be? 2 or 5?
After a long discussion the decisions was made to keep the last value as
calculated by the auto mode (so 2 in the example above).
The reason is that webcams that do such things will adapt themselves to
the current light conditions and when you switch back to manual mode you
expect that you keep the same picture. If you would switch back to old
manual values, then that would give you a suddenly different picture,
which is jarring for the user.
Additionally, this would be difficult to implement in applications that
store and restore the control values at application exit and start.
If you want to keep the old manual values when you switch from auto to
manual, then there would have to be a way for applications to get hold
of those old values while in auto mode, but there isn't.
So this patch will do all the heavy lifting in v4l2-ctrls.c: if you go
from auto mode to manual mode and the manual controls are volatile, then
g_volatile_ctrl will be called to get the current values for the manual
controls before switching to manual mode.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-08-26 04:53:53 -06:00
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unsigned int has_volatiles:1;
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2011-06-28 07:43:13 -06:00
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unsigned int manual_mode_value:8;
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2010-08-01 11:32:42 -06:00
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const struct v4l2_ctrl_ops *ops;
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u32 id;
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const char *name;
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enum v4l2_ctrl_type type;
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s32 minimum, maximum, default_value;
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union {
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u32 step;
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u32 menu_skip_mask;
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};
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2011-08-04 10:51:11 -06:00
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union {
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const char * const *qmenu;
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const s64 *qmenu_int;
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};
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2010-08-01 11:32:42 -06:00
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unsigned long flags;
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union {
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s32 val;
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s64 val64;
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char *string;
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} cur;
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union {
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s32 val;
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s64 val64;
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char *string;
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};
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void *priv;
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};
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/** struct v4l2_ctrl_ref - The control reference.
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* @node: List node for the sorted list.
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* @next: Single-link list node for the hash.
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* @ctrl: The actual control information.
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2011-06-14 07:04:06 -06:00
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* @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls().
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2010-08-01 11:32:42 -06:00
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*
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* Each control handler has a list of these refs. The list_head is used to
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* keep a sorted-by-control-ID list of all controls, while the next pointer
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* is used to link the control in the hash's bucket.
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*/
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struct v4l2_ctrl_ref {
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struct list_head node;
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struct v4l2_ctrl_ref *next;
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struct v4l2_ctrl *ctrl;
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2011-06-14 07:04:06 -06:00
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struct v4l2_ctrl_helper *helper;
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2010-08-01 11:32:42 -06:00
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};
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/** struct v4l2_ctrl_handler - The control handler keeps track of all the
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* controls: both the controls owned by the handler and those inherited
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* from other handlers.
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2012-01-24 17:05:34 -07:00
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* @_lock: Default for "lock".
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2010-08-01 11:32:42 -06:00
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* @lock: Lock to control access to this handler and its controls.
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2012-01-24 17:05:34 -07:00
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* May be replaced by the user right after init.
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2010-08-01 11:32:42 -06:00
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* @ctrls: The list of controls owned by this handler.
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* @ctrl_refs: The list of control references.
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* @cached: The last found control reference. It is common that the same
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* control is needed multiple times, so this is a simple
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* optimization.
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* @buckets: Buckets for the hashing. Allows for quick control lookup.
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* @nr_of_buckets: Total number of buckets in the array.
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* @error: The error code of the first failed control addition.
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*/
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struct v4l2_ctrl_handler {
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2012-01-24 17:05:34 -07:00
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struct mutex _lock;
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struct mutex *lock;
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2010-08-01 11:32:42 -06:00
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struct list_head ctrls;
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struct list_head ctrl_refs;
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struct v4l2_ctrl_ref *cached;
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struct v4l2_ctrl_ref **buckets;
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u16 nr_of_buckets;
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int error;
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};
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/** struct v4l2_ctrl_config - Control configuration structure.
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* @ops: The control ops.
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* @id: The control ID.
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* @name: The control name.
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* @type: The control type.
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* @min: The control's minimum value.
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* @max: The control's maximum value.
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* @step: The control's step value for non-menu controls.
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* @def: The control's default value.
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* @flags: The control's flags.
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* @menu_skip_mask: The control's skip mask for menu controls. This makes it
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* easy to skip menu items that are not valid. If bit X is set,
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* then menu item X is skipped. Of course, this only works for
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* menus with <= 32 menu items. There are no menus that come
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* close to that number, so this is OK. Should we ever need more,
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* then this will have to be extended to a u64 or a bit array.
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* @qmenu: A const char * array for all menu items. Array entries that are
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* empty strings ("") correspond to non-existing menu items (this
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* is in addition to the menu_skip_mask above). The last entry
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* must be NULL.
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* @is_private: If set, then this control is private to its handler and it
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* will not be added to any other handlers.
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*/
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struct v4l2_ctrl_config {
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const struct v4l2_ctrl_ops *ops;
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u32 id;
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const char *name;
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enum v4l2_ctrl_type type;
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s32 min;
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s32 max;
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u32 step;
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s32 def;
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u32 flags;
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u32 menu_skip_mask;
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2010-12-29 10:25:52 -07:00
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const char * const *qmenu;
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2011-08-04 10:51:11 -06:00
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const s64 *qmenu_int;
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2010-08-01 11:32:42 -06:00
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unsigned int is_private:1;
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};
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/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
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*
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* This works for all standard V4L2 controls.
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* For non-standard controls it will only fill in the given arguments
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* and @name will be NULL.
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*
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* This function will overwrite the contents of @name, @type and @flags.
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* The contents of @min, @max, @step and @def may be modified depending on
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* the type.
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*
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* Do not use in drivers! It is used internally for backwards compatibility
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* control handling only. Once all drivers are converted to use the new
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* control framework this function will no longer be exported.
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*/
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void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
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s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags);
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/** v4l2_ctrl_handler_init() - Initialize the control handler.
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* @hdl: The control handler.
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* @nr_of_controls_hint: A hint of how many controls this handler is
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* expected to refer to. This is the total number, so including
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* any inherited controls. It doesn't have to be precise, but if
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* it is way off, then you either waste memory (too many buckets
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* are allocated) or the control lookup becomes slower (not enough
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* buckets are allocated, so there are more slow list lookups).
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* It will always work, though.
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*
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* Returns an error if the buckets could not be allocated. This error will
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* also be stored in @hdl->error.
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*/
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int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
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unsigned nr_of_controls_hint);
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/** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free
|
|
|
|
* the control list.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
*
|
|
|
|
* Does nothing if @hdl == NULL.
|
|
|
|
*/
|
|
|
|
void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
|
|
|
|
* to the handler to initialize the hardware to the current control values.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
*
|
|
|
|
* Button controls will be skipped, as are read-only controls.
|
|
|
|
*
|
|
|
|
* If @hdl == NULL, then this just returns 0.
|
|
|
|
*/
|
|
|
|
int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @prefix: The prefix to use when logging the control values. If the
|
|
|
|
* prefix does not end with a space, then ": " will be added
|
|
|
|
* after the prefix. If @prefix == NULL, then no prefix will be
|
|
|
|
* used.
|
|
|
|
*
|
|
|
|
* For use with VIDIOC_LOG_STATUS.
|
|
|
|
*
|
|
|
|
* Does nothing if @hdl == NULL.
|
|
|
|
*/
|
|
|
|
void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
|
|
|
|
const char *prefix);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
|
|
|
|
* control.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @cfg: The control's configuration data.
|
|
|
|
* @priv: The control's driver-specific private data.
|
|
|
|
*
|
|
|
|
* If the &v4l2_ctrl struct could not be allocated then NULL is returned
|
|
|
|
* and @hdl->error is set to the error code (if it wasn't set already).
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
|
|
|
|
const struct v4l2_ctrl_config *cfg, void *priv);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @ops: The control ops.
|
|
|
|
* @id: The control ID.
|
|
|
|
* @min: The control's minimum value.
|
|
|
|
* @max: The control's maximum value.
|
|
|
|
* @step: The control's step value
|
|
|
|
* @def: The control's default value.
|
|
|
|
*
|
|
|
|
* If the &v4l2_ctrl struct could not be allocated, or the control
|
|
|
|
* ID is not known, then NULL is returned and @hdl->error is set to the
|
|
|
|
* appropriate error code (if it wasn't set already).
|
|
|
|
*
|
|
|
|
* If @id refers to a menu control, then this function will return NULL.
|
|
|
|
*
|
|
|
|
* Use v4l2_ctrl_new_std_menu() when adding menu controls.
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
|
|
|
|
const struct v4l2_ctrl_ops *ops,
|
|
|
|
u32 id, s32 min, s32 max, u32 step, s32 def);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @ops: The control ops.
|
|
|
|
* @id: The control ID.
|
|
|
|
* @max: The control's maximum value.
|
|
|
|
* @mask: The control's skip mask for menu controls. This makes it
|
|
|
|
* easy to skip menu items that are not valid. If bit X is set,
|
|
|
|
* then menu item X is skipped. Of course, this only works for
|
|
|
|
* menus with <= 32 menu items. There are no menus that come
|
|
|
|
* close to that number, so this is OK. Should we ever need more,
|
|
|
|
* then this will have to be extended to a u64 or a bit array.
|
|
|
|
* @def: The control's default value.
|
|
|
|
*
|
|
|
|
* Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value
|
|
|
|
* determines which menu items are to be skipped.
|
|
|
|
*
|
|
|
|
* If @id refers to a non-menu control, then this function will return NULL.
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
|
|
|
|
const struct v4l2_ctrl_ops *ops,
|
|
|
|
u32 id, s32 max, s32 mask, s32 def);
|
|
|
|
|
2012-05-06 12:30:44 -06:00
|
|
|
/** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @ops: The control ops.
|
|
|
|
* @id: The control ID.
|
|
|
|
* @max: The control's maximum value.
|
|
|
|
* @def: The control's default value.
|
|
|
|
* @qmenu_int: The control's menu entries.
|
|
|
|
*
|
|
|
|
* Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly
|
|
|
|
* takes as an argument an array of integers determining the menu items.
|
|
|
|
*
|
|
|
|
* If @id refers to a non-integer-menu control, then this function will return NULL.
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
|
|
|
|
const struct v4l2_ctrl_ops *ops,
|
|
|
|
u32 id, s32 max, s32 def, const s64 *qmenu_int);
|
|
|
|
|
2010-08-01 11:32:42 -06:00
|
|
|
/** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @ctrl: The control to add.
|
|
|
|
*
|
|
|
|
* It will return NULL if it was unable to add the control reference.
|
|
|
|
* If the control already belonged to the handler, then it will do
|
|
|
|
* nothing and just return @ctrl.
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
|
|
|
|
struct v4l2_ctrl *ctrl);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_add_handler() - Add all controls from handler @add to
|
|
|
|
* handler @hdl.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @add: The control handler whose controls you want to add to
|
|
|
|
* the @hdl control handler.
|
|
|
|
*
|
|
|
|
* Does nothing if either of the two is a NULL pointer.
|
|
|
|
* In case of an error @hdl->error will be set to the error code (if it
|
|
|
|
* wasn't set already).
|
|
|
|
*/
|
|
|
|
int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
|
|
|
|
struct v4l2_ctrl_handler *add);
|
|
|
|
|
|
|
|
|
|
|
|
/** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
|
|
|
|
* @ncontrols: The number of controls in this cluster.
|
|
|
|
* @controls: The cluster control array of size @ncontrols.
|
|
|
|
*/
|
|
|
|
void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
|
|
|
|
|
|
|
|
|
2011-06-10 02:44:36 -06:00
|
|
|
/** v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to
|
|
|
|
* that cluster and set it up for autofoo/foo-type handling.
|
|
|
|
* @ncontrols: The number of controls in this cluster.
|
|
|
|
* @controls: The cluster control array of size @ncontrols. The first control
|
|
|
|
* must be the 'auto' control (e.g. autogain, autoexposure, etc.)
|
|
|
|
* @manual_val: The value for the first control in the cluster that equals the
|
|
|
|
* manual setting.
|
|
|
|
* @set_volatile: If true, then all controls except the first auto control will
|
2011-08-26 04:35:14 -06:00
|
|
|
* be volatile.
|
2011-06-10 02:44:36 -06:00
|
|
|
*
|
|
|
|
* Use for control groups where one control selects some automatic feature and
|
|
|
|
* the other controls are only active whenever the automatic feature is turned
|
|
|
|
* off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs
|
|
|
|
* red and blue balance, etc.
|
|
|
|
*
|
|
|
|
* The behavior of such controls is as follows:
|
|
|
|
*
|
|
|
|
* When the autofoo control is set to automatic, then any manual controls
|
|
|
|
* are set to inactive and any reads will call g_volatile_ctrl (if the control
|
|
|
|
* was marked volatile).
|
|
|
|
*
|
|
|
|
* When the autofoo control is set to manual, then any manual controls will
|
|
|
|
* be marked active, and any reads will just return the current value without
|
|
|
|
* going through g_volatile_ctrl.
|
|
|
|
*
|
|
|
|
* In addition, this function will set the V4L2_CTRL_FLAG_UPDATE flag
|
|
|
|
* on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s)
|
|
|
|
* if autofoo is in auto mode.
|
|
|
|
*/
|
|
|
|
void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
|
|
|
|
u8 manual_val, bool set_volatile);
|
|
|
|
|
|
|
|
|
2010-08-01 11:32:42 -06:00
|
|
|
/** v4l2_ctrl_find() - Find a control with the given ID.
|
|
|
|
* @hdl: The control handler.
|
|
|
|
* @id: The control ID to find.
|
|
|
|
*
|
|
|
|
* If @hdl == NULL this will return NULL as well. Will lock the handler so
|
|
|
|
* do not use from inside &v4l2_ctrl_ops.
|
|
|
|
*/
|
|
|
|
struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_activate() - Make the control active or inactive.
|
|
|
|
* @ctrl: The control to (de)activate.
|
|
|
|
* @active: True if the control should become active.
|
|
|
|
*
|
|
|
|
* This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically.
|
|
|
|
* Does nothing if @ctrl == NULL.
|
|
|
|
* This will usually be called from within the s_ctrl op.
|
2011-06-07 08:13:44 -06:00
|
|
|
* The V4L2_EVENT_CTRL event will be generated afterwards.
|
2010-08-01 11:32:42 -06:00
|
|
|
*
|
2011-06-07 08:13:44 -06:00
|
|
|
* This function assumes that the control handler is locked.
|
2010-08-01 11:32:42 -06:00
|
|
|
*/
|
|
|
|
void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
|
|
|
|
* @ctrl: The control to (de)activate.
|
|
|
|
* @grabbed: True if the control should become grabbed.
|
|
|
|
*
|
|
|
|
* This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
|
|
|
|
* Does nothing if @ctrl == NULL.
|
2011-06-07 08:13:44 -06:00
|
|
|
* The V4L2_EVENT_CTRL event will be generated afterwards.
|
2010-08-01 11:32:42 -06:00
|
|
|
* This will usually be called when starting or stopping streaming in the
|
|
|
|
* driver.
|
|
|
|
*
|
2011-06-07 08:13:44 -06:00
|
|
|
* This function assumes that the control handler is not locked and will
|
|
|
|
* take the lock itself.
|
2010-08-01 11:32:42 -06:00
|
|
|
*/
|
|
|
|
void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_lock() - Helper function to lock the handler
|
|
|
|
* associated with the control.
|
|
|
|
* @ctrl: The control to lock.
|
|
|
|
*/
|
|
|
|
static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
|
|
|
|
{
|
2012-01-24 17:05:34 -07:00
|
|
|
mutex_lock(ctrl->handler->lock);
|
2010-08-01 11:32:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/** v4l2_ctrl_lock() - Helper function to unlock the handler
|
|
|
|
* associated with the control.
|
|
|
|
* @ctrl: The control to unlock.
|
|
|
|
*/
|
|
|
|
static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
|
|
|
|
{
|
2012-01-24 17:05:34 -07:00
|
|
|
mutex_unlock(ctrl->handler->lock);
|
2010-08-01 11:32:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
|
|
|
|
* @ctrl: The control.
|
|
|
|
*
|
|
|
|
* This returns the control's value 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 integer type controls only.
|
|
|
|
*/
|
|
|
|
s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
|
|
|
|
|
|
|
|
/** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver.
|
|
|
|
* @ctrl: The control.
|
|
|
|
* @val: The new value.
|
|
|
|
*
|
|
|
|
* This set the control's new value 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 integer type controls only.
|
|
|
|
*/
|
|
|
|
int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
|
|
|
|
|
2011-06-10 02:56:39 -06:00
|
|
|
/* Internal helper functions that deal with control events. */
|
2012-04-08 09:59:47 -06:00
|
|
|
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);
|
|
|
|
void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
|
2011-06-07 08:13:44 -06:00
|
|
|
|
2012-02-02 04:20:53 -07:00
|
|
|
/* Can be used as a vidioc_log_status function that just dumps all controls
|
|
|
|
associated with the filehandle. */
|
|
|
|
int v4l2_ctrl_log_status(struct file *file, void *fh);
|
|
|
|
|
2012-01-27 12:18:42 -07:00
|
|
|
/* Can be used as a vidioc_subscribe_event function that just subscribes
|
|
|
|
control events. */
|
|
|
|
int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
|
|
|
|
struct v4l2_event_subscription *sub);
|
|
|
|
|
|
|
|
/* Can be used as a poll function that just polls for control events. */
|
|
|
|
unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
|
|
|
|
|
2010-08-01 11:32:42 -06:00
|
|
|
/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
|
|
|
|
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
|
|
|
|
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
|
|
|
|
int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
|
2011-06-07 03:47:18 -06:00
|
|
|
int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
|
|
|
struct v4l2_control *ctrl);
|
2010-08-01 11:32:42 -06:00
|
|
|
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
|
|
|
|
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
|
2011-06-07 03:47:18 -06:00
|
|
|
int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
|
|
|
struct v4l2_ext_controls *c);
|
2010-08-01 11:32:42 -06:00
|
|
|
|
|
|
|
/* Helpers for subdevices. If the associated ctrl_handler == NULL then they
|
|
|
|
will all return -EINVAL. */
|
|
|
|
int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
|
|
|
|
int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
|
|
|
|
int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
|
|
|
|
int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
|
|
|
|
int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
|
|
|
|
int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
|
|
|
|
int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
|
|
|
|
|
|
|
|
#endif
|