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/*
V4L2 controls support header.
Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _V4L2_CTRLS_H
#define _V4L2_CTRLS_H
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
/* forward references */
struct file;
struct v4l2_ctrl_handler;
struct v4l2_ctrl_helper;
struct v4l2_ctrl;
struct video_device;
struct v4l2_subdev;
struct v4l2_subscribed_event;
struct v4l2_fh;
struct poll_table_struct;
/** union v4l2_ctrl_ptr - A pointer to a control value.
* @p_s32: Pointer to a 32-bit signed value.
* @p_s64: Pointer to a 64-bit signed value.
* @p_u8: Pointer to a 8-bit unsigned value.
* @p_u16: Pointer to a 16-bit unsigned value.
* @p_u32: Pointer to a 32-bit unsigned value.
* @p_char: Pointer to a string.
* @p: Pointer to a compound value.
*/
union v4l2_ctrl_ptr {
s32 *p_s32;
s64 *p_s64;
u8 *p_u8;
u16 *p_u16;
u32 *p_u32;
char *p_char;
void *p;
};
/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
* for volatile (and usually read-only) controls such as a control
* that returns the current signal strength which changes
* continuously.
* If not set, then the currently cached value will be returned.
* @try_ctrl: Test whether the control's value is valid. Only relevant when
* the usual min/max/step checks are not sufficient.
* @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
* ctrl->handler->lock is held when these ops are called, so no
* one else can access controls owned by that handler.
*/
struct v4l2_ctrl_ops {
int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
int (*try_ctrl)(struct v4l2_ctrl *ctrl);
int (*s_ctrl)(struct v4l2_ctrl *ctrl);
};
/** struct v4l2_ctrl_type_ops - The control type operations that the driver has to provide.
* @equal: return true if both values are equal.
* @init: initialize the value.
* @log: log the value.
* @validate: validate the value. Return 0 on success and a negative value otherwise.
*/
struct v4l2_ctrl_type_ops {
bool (*equal)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr1,
union v4l2_ctrl_ptr ptr2);
void (*init)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr);
void (*log)(const struct v4l2_ctrl *ctrl);
int (*validate)(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr);
};
typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
/** struct v4l2_ctrl - The control structure.
* @node: The list node.
* @ev_subs: The list of control event subscriptions.
* @handler: The handler that owns the control.
* @cluster: Point to start of cluster array.
* @ncontrols: Number of controls in cluster array.
* @done: Internal flag: set for each processed control.
* @is_new: Set when the user specified a new value for this control. It
* is also set when called from v4l2_ctrl_handler_setup. Drivers
* should never set this flag.
* @has_changed: Set when the current value differs from the new value. Drivers
* should never use this flag.
* @is_private: If set, then this control is private to its handler and it
* will not be added to any other handlers. Drivers can set
* this flag.
* @is_auto: If set, then this control selects whether the other cluster
* members are in 'automatic' mode or 'manual' mode. This is
* used for autogain/gain type clusters. Drivers should never
* set this flag directly.
* @is_int: If set, then this control has a simple integer value (i.e. it
* uses ctrl->val).
* @is_string: If set, then this control has type V4L2_CTRL_TYPE_STRING.
* @is_ptr: If set, then this control is an array and/or has type >= V4L2_CTRL_COMPOUND_TYPES
* and/or has type V4L2_CTRL_TYPE_STRING. In other words, struct
* v4l2_ext_control uses field p to point to the data.
* @is_array: If set, then this control contains an N-dimensional array.
* @has_volatiles: If set, then one or more members of the cluster are volatile.
* Drivers should never touch this flag.
* @call_notify: If set, then call the handler's notify function whenever the
* control's value changes.
* @manual_mode_value: If the is_auto flag is set, then this is the value
* of the auto control that determines if that control is in
* manual mode. So if the value of the auto control equals this
* value, then the whole cluster is in manual mode. Drivers should
* never set this flag directly.
* @ops: The control ops.
* @type_ops: The control type ops.
* @id: The control ID.
* @name: The control name.
* @type: The control type.
* @minimum: The control's minimum value.
* @maximum: The control's maximum value.
* @default_value: The control's default value.
* @step: The control's step value for non-menu controls.
* @elems: The number of elements in the N-dimensional array.
* @elem_size: The size in bytes of the control.
* @dims: The size of each dimension.
* @nr_of_dims:The number of dimensions in @dims.
* @menu_skip_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.
* @qmenu: A const char * array for all menu items. Array entries that are
* empty strings ("") correspond to non-existing menu items (this
* is in addition to the menu_skip_mask above). The last entry
* must be NULL.
* @flags: The control's flags.
* @cur: The control's current value.
* @val: The control's new s32 value.
* @val64: The control's new s64 value.
* @priv: The control's private pointer. For use by the driver. It is
* untouched by the control framework. Note that this pointer is
* not freed when the control is deleted. Should this be needed
* then a new internal bitfield can be added to tell the framework
* to free this pointer.
*/
struct v4l2_ctrl {
/* Administrative fields */
struct list_head node;
struct list_head ev_subs;
struct v4l2_ctrl_handler *handler;
struct v4l2_ctrl **cluster;
unsigned ncontrols;
unsigned int done:1;
unsigned int is_new:1;
unsigned int has_changed:1;
unsigned int is_private:1;
unsigned int is_auto:1;
unsigned int is_int:1;
unsigned int is_string:1;
unsigned int is_ptr:1;
unsigned int is_array:1;
unsigned int has_volatiles:1;
unsigned int call_notify:1;
unsigned int manual_mode_value:8;
const struct v4l2_ctrl_ops *ops;
const struct v4l2_ctrl_type_ops *type_ops;
u32 id;
const char *name;
enum v4l2_ctrl_type type;
s64 minimum, maximum, default_value;
u32 elems;
u32 elem_size;
u32 dims[V4L2_CTRL_MAX_DIMS];
u32 nr_of_dims;
union {
u64 step;
u64 menu_skip_mask;
};
union {
const char * const *qmenu;
const s64 *qmenu_int;
};
unsigned long flags;
void *priv;
s32 val;
struct {
s32 val;
} cur;
union v4l2_ctrl_ptr p_new;
union v4l2_ctrl_ptr p_cur;
};
/** struct v4l2_ctrl_ref - The control reference.
* @node: List node for the sorted list.
* @next: Single-link list node for the hash.
* @ctrl: The actual control information.
* @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls().
*
* Each control handler has a list of these refs. The list_head is used to
* keep a sorted-by-control-ID list of all controls, while the next pointer
* is used to link the control in the hash's bucket.
*/
struct v4l2_ctrl_ref {
struct list_head node;
struct v4l2_ctrl_ref *next;
struct v4l2_ctrl *ctrl;
struct v4l2_ctrl_helper *helper;
};
/** struct v4l2_ctrl_handler - The control handler keeps track of all the
* controls: both the controls owned by the handler and those inherited
* from other handlers.
* @_lock: Default for "lock".
* @lock: Lock to control access to this handler and its controls.
* May be replaced by the user right after init.
* @ctrls: The list of controls owned by this handler.
* @ctrl_refs: The list of control references.
* @cached: The last found control reference. It is common that the same
* control is needed multiple times, so this is a simple
* optimization.
* @buckets: Buckets for the hashing. Allows for quick control lookup.
* @notify: A notify callback that is called whenever the control changes value.
* Note that the handler's lock is held when the notify function
* is called!
* @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
* @nr_of_buckets: Total number of buckets in the array.
* @error: The error code of the first failed control addition.
*/
struct v4l2_ctrl_handler {
struct mutex _lock;
struct mutex *lock;
struct list_head ctrls;
struct list_head ctrl_refs;
struct v4l2_ctrl_ref *cached;
struct v4l2_ctrl_ref **buckets;
v4l2_ctrl_notify_fnc notify;
void *notify_priv;
u16 nr_of_buckets;
int
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