diff options
Diffstat (limited to 'include/media/v4l2-ctrls.h')
| -rw-r--r-- | include/media/v4l2-ctrls.h | 1018 |
1 files changed, 558 insertions, 460 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h index 911f3e542834..da6fe9802fee 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 +97,80 @@ 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. + * @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. + * @p_cur: The control's current value represented via an union with + * provides a standard way of accessing control types + * through a pointer. + * @p_new: The control's new value represented via an union with provides + * a standard way of accessing control types + * through a pointer. + */ struct v4l2_ctrl { /* Administrative fields */ struct list_head node; @@ -210,16 +221,17 @@ 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 +239,26 @@ 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 +272,35 @@ 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. + * @qmenu_int: A const s64 integer array for all menu items of the type + * V4L2_CTRL_TYPE_INTEGER_MENU. + * @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 +320,44 @@ 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 +379,326 @@ 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 +711,23 @@ 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 +735,8 @@ 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 +744,8 @@ 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 +754,41 @@ 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 +800,45 @@ 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 +850,31 @@ 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; |
