mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
79fbc209f1
For some unknown reason several control prototypes where in v4l2-common.c instead of in v4l2-ctrls.h. Move them and document them. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
839 lines
32 KiB
C
839 lines
32 KiB
C
/*
|
|
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 error;
|
|
};
|
|
|
|
/** struct v4l2_ctrl_config - Control configuration structure.
|
|
* @ops: The control ops.
|
|
* @type_ops: The control type ops. Only needed for compound controls.
|
|
* @id: The control ID.
|
|
* @name: The control name.
|
|
* @type: The control type.
|
|
* @min: The control's minimum value.
|
|
* @max: The control's maximum value.
|
|
* @step: The control's step value for non-menu controls.
|
|
* @def: The control's default value.
|
|
* @dims: The size of each dimension.
|
|
* @elem_size: The size in bytes of the control.
|
|
* @flags: The control's flags.
|
|
* @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 <= 64 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 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.
|
|
* @is_private: If set, then this control is private to its handler and it
|
|
* will not be added to any other handlers.
|
|
*/
|
|
struct v4l2_ctrl_config {
|
|
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 min;
|
|
s64 max;
|
|
u64 step;
|
|
s64 def;
|
|
u32 dims[V4L2_CTRL_MAX_DIMS];
|
|
u32 elem_size;
|
|
u32 flags;
|
|
u64 menu_skip_mask;
|
|
const char * const *qmenu;
|
|
const s64 *qmenu_int;
|
|
unsigned int is_private:1;
|
|
};
|
|
|
|
/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
|
|
*
|
|
* This works for all standard V4L2 controls.
|
|
* For non-standard controls it will only fill in the given arguments
|
|
* and @name will be NULL.
|
|
*
|
|
* This function will overwrite the contents of @name, @type and @flags.
|
|
* The contents of @min, @max, @step and @def may be modified depending on
|
|
* the type.
|
|
*
|
|
* Do not use in drivers! It is used internally for backwards compatibility
|
|
* control handling only. Once all drivers are converted to use the new
|
|
* control framework this function will no longer be exported.
|
|
*/
|
|
void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
|
|
s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags);
|
|
|
|
|
|
/** v4l2_ctrl_handler_init_class() - Initialize the control handler.
|
|
* @hdl: The control handler.
|
|
* @nr_of_controls_hint: A hint of how many controls this handler is
|
|
* expected to refer to. This is the total number, so including
|
|
* any inherited controls. It doesn't have to be precise, but if
|
|
* it is way off, then you either waste memory (too many buckets
|
|
* are allocated) or the control lookup becomes slower (not enough
|
|
* buckets are allocated, so there are more slow list lookups).
|
|
* It will always work, though.
|
|
* @key: Used by the lock validator if CONFIG_LOCKDEP is set.
|
|
* @name: Used by the lock validator if CONFIG_LOCKDEP is set.
|
|
*
|
|
* Returns an error if the buckets could not be allocated. This error will
|
|
* also be stored in @hdl->error.
|
|
*
|
|
* Never use this call directly, always use the v4l2_ctrl_handler_init
|
|
* macro that hides the @key and @name arguments.
|
|
*/
|
|
int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
|
|
unsigned nr_of_controls_hint,
|
|
struct lock_class_key *key, const char *name);
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
|
|
( \
|
|
({ \
|
|
static struct lock_class_key _key; \
|
|
v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \
|
|
&_key, \
|
|
KBUILD_BASENAME ":" \
|
|
__stringify(__LINE__) ":" \
|
|
"(" #hdl ")->_lock"); \
|
|
}) \
|
|
)
|
|
#else
|
|
#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
|
|
v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL)
|
|
#endif
|
|
|
|
/** 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_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)
|
|
{
|
|
mutex_lock(ctrl->handler->lock);
|
|
}
|
|
|
|
/** v4l2_ctrl_unlock() - 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)
|
|
{
|
|
mutex_unlock(ctrl->handler->lock);
|
|
}
|
|
|
|
/** 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, s64 min, s64 max, u64 step, s64 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 <= 64 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 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, u8 max, u64 mask, u8 def);
|
|
|
|
/** v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
|
|
* with driver specific menu.
|
|
* @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 <= 64 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 bit array.
|
|
* @def: The control's default value.
|
|
* @qmenu: The new menu.
|
|
*
|
|
* Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific
|
|
* menu of this control.
|
|
*
|
|
*/
|
|
struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
|
|
const struct v4l2_ctrl_ops *ops, u32 id, u8 max,
|
|
u64 mask, u8 def, const char * const *qmenu);
|
|
|
|
/** 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, u8 max, u8 def, const s64 *qmenu_int);
|
|
|
|
/** 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.
|
|
* @filter: This function will filter which controls should be added.
|
|
*
|
|
* Does nothing if either of the two handlers is a NULL pointer.
|
|
* If @filter is NULL, then all controls are added. Otherwise only those
|
|
* controls for which @filter returns true will be added.
|
|
* 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,
|
|
bool (*filter)(const struct v4l2_ctrl *ctrl));
|
|
|
|
/** v4l2_ctrl_radio_filter() - Standard filter for radio controls.
|
|
* @ctrl: The control that is filtered.
|
|
*
|
|
* This will return true for any controls that are valid for radio device
|
|
* nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM
|
|
* transmitter class controls.
|
|
*
|
|
* This function is to be used with v4l2_ctrl_add_handler().
|
|
*/
|
|
bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
|
|
|
|
/** 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);
|
|
|
|
|
|
/** 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
|
|
* be volatile.
|
|
*
|
|
* 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);
|
|
|
|
|
|
/** 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.
|
|
* The V4L2_EVENT_CTRL event will be generated afterwards.
|
|
*
|
|
* This function assumes that the control handler is locked.
|
|
*/
|
|
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.
|
|
* The V4L2_EVENT_CTRL event will be generated afterwards.
|
|
* This will usually be called when starting or stopping streaming in the
|
|
* driver.
|
|
*
|
|
* This function assumes that the control handler is not locked and will
|
|
* take the lock itself.
|
|
*/
|
|
void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
|
|
|
|
|
|
/** __v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range() */
|
|
int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|
s64 min, s64 max, u64 step, s64 def);
|
|
|
|
/** v4l2_ctrl_modify_range() - Update the range of a control.
|
|
* @ctrl: The control to update.
|
|
* @min: The control's minimum value.
|
|
* @max: The control's maximum value.
|
|
* @step: The control's step value
|
|
* @def: The control's default value.
|
|
*
|
|
* Update the range of a control on the fly. This works for control types
|
|
* INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
|
|
* @step value is interpreted as a menu_skip_mask.
|
|
*
|
|
* An error is returned if one of the range arguments is invalid for this
|
|
* control type.
|
|
*
|
|
* This function assumes that the control handler is not locked and will
|
|
* take the lock itself.
|
|
*/
|
|
static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
|
|
s64 min, s64 max, u64 step, s64 def)
|
|
{
|
|
int rval;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/** v4l2_ctrl_notify() - Function to set a notify callback for a control.
|
|
* @ctrl: The control.
|
|
* @notify: The callback function.
|
|
* @priv: The callback private handle, passed as argument to the callback.
|
|
*
|
|
* This function sets a callback function for the control. If @ctrl is NULL,
|
|
* then it will do nothing. If @notify is NULL, then the notify callback will
|
|
* be removed.
|
|
*
|
|
* There can be only one notify. If another already exists, then a WARN_ON
|
|
* will be issued and the function will do nothing.
|
|
*/
|
|
void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv);
|
|
|
|
/** v4l2_ctrl_get_name() - Get the name of the control
|
|
* @id: The control ID.
|
|
*
|
|
* This function returns the name of the given control ID or NULL if it isn't
|
|
* a known control.
|
|
*/
|
|
const char *v4l2_ctrl_get_name(u32 id);
|
|
|
|
/** v4l2_ctrl_get_menu() - Get the menu string array of the control
|
|
* @id: The control ID.
|
|
*
|
|
* This function returns the NULL-terminated menu string array name of the
|
|
* given control ID or NULL if it isn't a known menu control.
|
|
*/
|
|
const char * const *v4l2_ctrl_get_menu(u32 id);
|
|
|
|
/** v4l2_ctrl_get_int_menu() - Get the integer menu array of the control
|
|
* @id: The control ID.
|
|
* @len: The size of the integer array.
|
|
*
|
|
* This function returns the integer array of the given control ID or NULL if it
|
|
* if it isn't a known integer menu control.
|
|
*/
|
|
const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len);
|
|
|
|
/** 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() - Unlocked variant of v4l2_ctrl_s_ctrl(). */
|
|
int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
|
|
/** 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.
|
|
*/
|
|
static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
|
|
{
|
|
int rval;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
rval = __v4l2_ctrl_s_ctrl(ctrl, val);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit 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 64-bit integer type controls only.
|
|
*/
|
|
s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
|
|
|
|
/** __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64(). */
|
|
int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
|
|
|
|
/** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit 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 64-bit integer type controls only.
|
|
*/
|
|
static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
|
|
{
|
|
int rval;
|
|
|
|
v4l2_ctrl_lock(ctrl);
|
|
rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val);
|
|
v4l2_ctrl_unlock(ctrl);
|
|
|
|
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);
|
|
void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
|
|
|
|
/* 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);
|
|
|
|
/* Can be used as a vidioc_subscribe_event function that just subscribes
|
|
control events. */
|
|
int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
|
|
const 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);
|
|
|
|
/* 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_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *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);
|
|
int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
|
struct v4l2_control *ctrl);
|
|
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);
|
|
int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
|
|
struct v4l2_ext_controls *c);
|
|
|
|
/* 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);
|
|
|
|
/* Can be used as a subscribe_event function that just subscribes control
|
|
events. */
|
|
int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
|
|
struct v4l2_event_subscription *sub);
|
|
|
|
/* Log all controls owned by subdev's control handler. */
|
|
int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd);
|
|
|
|
#endif
|