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authorMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-08-22 08:03:49 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-08-22 09:05:50 -0300
commit8c2721d57a4bac055ae7bb1874a13a928277d5ff (patch)
treee05d9e058143af369c5b855486aa92a88aba07fc /include/media
parent2a86e373e0cf926f5cb41725f1b0ce3874e7b1cf (diff)
[media] v4l2-ctrls.h: add to device-drivers DocBook
The comments there are using a wrong format. Due to that, DocBook were unable to parse it. Fix the tags format, and add it to device-drivers.xml. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Acked-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/v4l2-ctrls.h1011
1 files changed, 551 insertions, 460 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 911f3e542834..88f736661c06 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -36,7 +36,8 @@ struct v4l2_subscribed_event;
struct v4l2_fh;
struct poll_table_struct;
-/** union v4l2_ctrl_ptr - A pointer to a control value.
+/**
+ * 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.
@@ -55,30 +56,34 @@ union v4l2_ctrl_ptr {
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 - 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 - 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,
@@ -92,74 +97,75 @@ struct v4l2_ctrl_type_ops {
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 - 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;
@@ -210,16 +216,17 @@ struct v4l2_ctrl {
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 - 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;
@@ -227,25 +234,26 @@ struct v4l2_ctrl_ref {
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 - 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;
@@ -259,32 +267,33 @@ struct v4l2_ctrl_handler {
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 - 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;
@@ -304,42 +313,44 @@ struct v4l2_ctrl_config {
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.
- */
+/**
+ * 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.
- */
+/**
+ * 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);
@@ -361,289 +372,326 @@ int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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).
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- *
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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).
- */
+/**
+ * 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().
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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.
- */
+/**
+ * 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() */
+/**
+ *__v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range()
+ *
+ * @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.
+ */
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.
- */
+/**
+ * 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)
{
@@ -656,21 +704,23 @@ static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *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.
- */
+/**
+ * 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
+/**
+ * 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
@@ -678,7 +728,8 @@ void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void
*/
const char *v4l2_ctrl_get_name(u32 id);
-/** v4l2_ctrl_get_menu() - Get the menu string array of the control
+/**
+ * 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
@@ -686,7 +737,8 @@ const char *v4l2_ctrl_get_name(u32 id);
*/
const char * const *v4l2_ctrl_get_menu(u32 id);
-/** v4l2_ctrl_get_int_menu() - Get the integer menu array of the control
+/**
+ * v4l2_ctrl_get_int_menu() - Get the integer menu array of the control
* @id: The control ID.
* @len: The size of the integer array.
*
@@ -695,29 +747,41 @@ const char * const *v4l2_ctrl_get_menu(u32 id);
*/
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.
- */
+/**
+ * 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(). */
+/**
+ * __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl().
+ * @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);
+
/** 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.
- */
+ * @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;
@@ -729,30 +793,45 @@ static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
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.
- */
+/**
+ * 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(). */
+/**
+ * __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64().
+ *
+ * @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.
+ */
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.
- */
+/** 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;
@@ -764,19 +843,31 @@ 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(). */
+/** __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string().
+ *
+ * @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.
+ */
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.
- */
+/** 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;

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