blob: 911f3e542834b9d13987aa29b72b60bd62f8b586 [file] [log] [blame]
Hans Verkuil09965172010-08-01 14:32:42 -03001/*
2 V4L2 controls support header.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#ifndef _V4L2_CTRLS_H
22#define _V4L2_CTRLS_H
23
24#include <linux/list.h>
Andrzej Hajdaa19dec62013-06-28 05:44:22 -030025#include <linux/mutex.h>
Laurent Pinchart01c40c02010-11-19 11:20:06 -030026#include <linux/videodev2.h>
Hans Verkuil09965172010-08-01 14:32:42 -030027
28/* forward references */
Laurent Pinchart528f0f72012-04-23 08:20:35 -030029struct file;
Hans Verkuil09965172010-08-01 14:32:42 -030030struct v4l2_ctrl_handler;
Hans Verkuileb5b16e2011-06-14 10:04:06 -030031struct v4l2_ctrl_helper;
Hans Verkuil09965172010-08-01 14:32:42 -030032struct v4l2_ctrl;
33struct video_device;
34struct v4l2_subdev;
Hans Verkuil77068d32011-06-13 18:55:58 -030035struct v4l2_subscribed_event;
Hans Verkuil6e239392011-06-07 11:13:44 -030036struct v4l2_fh;
Hans Verkuila26243b2012-01-27 16:18:42 -030037struct poll_table_struct;
Hans Verkuil09965172010-08-01 14:32:42 -030038
Hans Verkuil01760772014-04-27 03:22:17 -030039/** union v4l2_ctrl_ptr - A pointer to a control value.
40 * @p_s32: Pointer to a 32-bit signed value.
41 * @p_s64: Pointer to a 64-bit signed value.
Hans Verkuildda4a4d2014-06-10 07:30:04 -030042 * @p_u8: Pointer to a 8-bit unsigned value.
43 * @p_u16: Pointer to a 16-bit unsigned value.
Hans Verkuil811c5082014-07-21 10:45:37 -030044 * @p_u32: Pointer to a 32-bit unsigned value.
Hans Verkuil01760772014-04-27 03:22:17 -030045 * @p_char: Pointer to a string.
46 * @p: Pointer to a compound value.
47 */
48union v4l2_ctrl_ptr {
49 s32 *p_s32;
50 s64 *p_s64;
Hans Verkuildda4a4d2014-06-10 07:30:04 -030051 u8 *p_u8;
52 u16 *p_u16;
Hans Verkuil811c5082014-07-21 10:45:37 -030053 u32 *p_u32;
Hans Verkuil01760772014-04-27 03:22:17 -030054 char *p_char;
55 void *p;
56};
57
Hans Verkuil09965172010-08-01 14:32:42 -030058/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
59 * @g_volatile_ctrl: Get a new value for this control. Generally only relevant
60 * for volatile (and usually read-only) controls such as a control
61 * that returns the current signal strength which changes
62 * continuously.
63 * If not set, then the currently cached value will be returned.
64 * @try_ctrl: Test whether the control's value is valid. Only relevant when
65 * the usual min/max/step checks are not sufficient.
66 * @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
67 * ctrl->handler->lock is held when these ops are called, so no
68 * one else can access controls owned by that handler.
69 */
70struct v4l2_ctrl_ops {
71 int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
72 int (*try_ctrl)(struct v4l2_ctrl *ctrl);
73 int (*s_ctrl)(struct v4l2_ctrl *ctrl);
74};
75
Hans Verkuil01760772014-04-27 03:22:17 -030076/** struct v4l2_ctrl_type_ops - The control type operations that the driver has to provide.
77 * @equal: return true if both values are equal.
78 * @init: initialize the value.
79 * @log: log the value.
80 * @validate: validate the value. Return 0 on success and a negative value otherwise.
81 */
82struct v4l2_ctrl_type_ops {
Hans Verkuil998e7652014-06-10 07:55:00 -030083 bool (*equal)(const struct v4l2_ctrl *ctrl, u32 idx,
Hans Verkuil01760772014-04-27 03:22:17 -030084 union v4l2_ctrl_ptr ptr1,
85 union v4l2_ctrl_ptr ptr2);
Hans Verkuil998e7652014-06-10 07:55:00 -030086 void (*init)(const struct v4l2_ctrl *ctrl, u32 idx,
Hans Verkuil01760772014-04-27 03:22:17 -030087 union v4l2_ctrl_ptr ptr);
88 void (*log)(const struct v4l2_ctrl *ctrl);
Hans Verkuil998e7652014-06-10 07:55:00 -030089 int (*validate)(const struct v4l2_ctrl *ctrl, u32 idx,
Hans Verkuil01760772014-04-27 03:22:17 -030090 union v4l2_ctrl_ptr ptr);
91};
92
Hans Verkuil8ac7a942012-09-07 04:46:39 -030093typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
94
Hans Verkuil09965172010-08-01 14:32:42 -030095/** struct v4l2_ctrl - The control structure.
96 * @node: The list node.
Hans Verkuil77068d32011-06-13 18:55:58 -030097 * @ev_subs: The list of control event subscriptions.
Hans Verkuil09965172010-08-01 14:32:42 -030098 * @handler: The handler that owns the control.
99 * @cluster: Point to start of cluster array.
100 * @ncontrols: Number of controls in cluster array.
Hans Verkuil09965172010-08-01 14:32:42 -0300101 * @done: Internal flag: set for each processed control.
Hans Verkuil2a863792011-01-11 14:45:03 -0300102 * @is_new: Set when the user specified a new value for this control. It
103 * is also set when called from v4l2_ctrl_handler_setup. Drivers
104 * should never set this flag.
Hans Verkuil9ea1b7a2014-01-17 08:25:26 -0300105 * @has_changed: Set when the current value differs from the new value. Drivers
106 * should never use this flag.
Hans Verkuil09965172010-08-01 14:32:42 -0300107 * @is_private: If set, then this control is private to its handler and it
108 * will not be added to any other handlers. Drivers can set
109 * this flag.
Hans Verkuil72d877c2011-06-10 05:44:36 -0300110 * @is_auto: If set, then this control selects whether the other cluster
111 * members are in 'automatic' mode or 'manual' mode. This is
112 * used for autogain/gain type clusters. Drivers should never
113 * set this flag directly.
Hans Verkuild9a25472014-06-12 07:54:16 -0300114 * @is_int: If set, then this control has a simple integer value (i.e. it
115 * uses ctrl->val).
116 * @is_string: If set, then this control has type V4L2_CTRL_TYPE_STRING.
117 * @is_ptr: If set, then this control is an array and/or has type >= V4L2_CTRL_COMPOUND_TYPES
118 * and/or has type V4L2_CTRL_TYPE_STRING. In other words, struct
119 * v4l2_ext_control uses field p to point to the data.
Hans Verkuil998e7652014-06-10 07:55:00 -0300120 * @is_array: If set, then this control contains an N-dimensional array.
Hans Verkuil5626b8c2011-08-26 07:53:53 -0300121 * @has_volatiles: If set, then one or more members of the cluster are volatile.
122 * Drivers should never touch this flag.
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300123 * @call_notify: If set, then call the handler's notify function whenever the
124 * control's value changes.
Hans Verkuil72d877c2011-06-10 05:44:36 -0300125 * @manual_mode_value: If the is_auto flag is set, then this is the value
126 * of the auto control that determines if that control is in
127 * manual mode. So if the value of the auto control equals this
128 * value, then the whole cluster is in manual mode. Drivers should
129 * never set this flag directly.
Hans Verkuil09965172010-08-01 14:32:42 -0300130 * @ops: The control ops.
Hans Verkuil01760772014-04-27 03:22:17 -0300131 * @type_ops: The control type ops.
Hans Verkuil09965172010-08-01 14:32:42 -0300132 * @id: The control ID.
133 * @name: The control name.
134 * @type: The control type.
135 * @minimum: The control's minimum value.
136 * @maximum: The control's maximum value.
137 * @default_value: The control's default value.
138 * @step: The control's step value for non-menu controls.
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300139 * @elems: The number of elements in the N-dimensional array.
Hans Verkuild9a25472014-06-12 07:54:16 -0300140 * @elem_size: The size in bytes of the control.
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300141 * @dims: The size of each dimension.
142 * @nr_of_dims:The number of dimensions in @dims.
Hans Verkuil09965172010-08-01 14:32:42 -0300143 * @menu_skip_mask: The control's skip mask for menu controls. This makes it
144 * easy to skip menu items that are not valid. If bit X is set,
145 * then menu item X is skipped. Of course, this only works for
146 * menus with <= 32 menu items. There are no menus that come
147 * close to that number, so this is OK. Should we ever need more,
148 * then this will have to be extended to a u64 or a bit array.
149 * @qmenu: A const char * array for all menu items. Array entries that are
150 * empty strings ("") correspond to non-existing menu items (this
151 * is in addition to the menu_skip_mask above). The last entry
152 * must be NULL.
153 * @flags: The control's flags.
154 * @cur: The control's current value.
155 * @val: The control's new s32 value.
156 * @val64: The control's new s64 value.
Hans Verkuil09965172010-08-01 14:32:42 -0300157 * @priv: The control's private pointer. For use by the driver. It is
158 * untouched by the control framework. Note that this pointer is
159 * not freed when the control is deleted. Should this be needed
160 * then a new internal bitfield can be added to tell the framework
161 * to free this pointer.
162 */
163struct v4l2_ctrl {
164 /* Administrative fields */
165 struct list_head node;
Hans Verkuil77068d32011-06-13 18:55:58 -0300166 struct list_head ev_subs;
Hans Verkuil09965172010-08-01 14:32:42 -0300167 struct v4l2_ctrl_handler *handler;
168 struct v4l2_ctrl **cluster;
169 unsigned ncontrols;
Hans Verkuil09965172010-08-01 14:32:42 -0300170 unsigned int done:1;
171
Hans Verkuil2a863792011-01-11 14:45:03 -0300172 unsigned int is_new:1;
Hans Verkuil9ea1b7a2014-01-17 08:25:26 -0300173 unsigned int has_changed:1;
Hans Verkuil09965172010-08-01 14:32:42 -0300174 unsigned int is_private:1;
Hans Verkuil72d877c2011-06-10 05:44:36 -0300175 unsigned int is_auto:1;
Hans Verkuild9a25472014-06-12 07:54:16 -0300176 unsigned int is_int:1;
177 unsigned int is_string:1;
178 unsigned int is_ptr:1;
Hans Verkuil998e7652014-06-10 07:55:00 -0300179 unsigned int is_array:1;
Hans Verkuil5626b8c2011-08-26 07:53:53 -0300180 unsigned int has_volatiles:1;
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300181 unsigned int call_notify:1;
Hans Verkuil82a7c042011-06-28 10:43:13 -0300182 unsigned int manual_mode_value:8;
Hans Verkuil09965172010-08-01 14:32:42 -0300183
184 const struct v4l2_ctrl_ops *ops;
Hans Verkuil01760772014-04-27 03:22:17 -0300185 const struct v4l2_ctrl_type_ops *type_ops;
Hans Verkuil09965172010-08-01 14:32:42 -0300186 u32 id;
187 const char *name;
188 enum v4l2_ctrl_type type;
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300189 s64 minimum, maximum, default_value;
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300190 u32 elems;
Hans Verkuild9a25472014-06-12 07:54:16 -0300191 u32 elem_size;
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300192 u32 dims[V4L2_CTRL_MAX_DIMS];
193 u32 nr_of_dims;
Hans Verkuil09965172010-08-01 14:32:42 -0300194 union {
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300195 u64 step;
196 u64 menu_skip_mask;
Hans Verkuil09965172010-08-01 14:32:42 -0300197 };
Sakari Ailusce580fe2011-08-04 13:51:11 -0300198 union {
199 const char * const *qmenu;
200 const s64 *qmenu_int;
201 };
Hans Verkuil09965172010-08-01 14:32:42 -0300202 unsigned long flags;
Hans Verkuil09965172010-08-01 14:32:42 -0300203 void *priv;
Hans Verkuil2a9ec372014-04-27 03:38:13 -0300204 s32 val;
205 struct {
Hans Verkuild9a25472014-06-12 07:54:16 -0300206 s32 val;
Hans Verkuild9a25472014-06-12 07:54:16 -0300207 } cur;
Hans Verkuil01760772014-04-27 03:22:17 -0300208
209 union v4l2_ctrl_ptr p_new;
210 union v4l2_ctrl_ptr p_cur;
Hans Verkuil09965172010-08-01 14:32:42 -0300211};
212
213/** struct v4l2_ctrl_ref - The control reference.
214 * @node: List node for the sorted list.
215 * @next: Single-link list node for the hash.
216 * @ctrl: The actual control information.
Hans Verkuileb5b16e2011-06-14 10:04:06 -0300217 * @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls().
Hans Verkuil09965172010-08-01 14:32:42 -0300218 *
219 * Each control handler has a list of these refs. The list_head is used to
220 * keep a sorted-by-control-ID list of all controls, while the next pointer
221 * is used to link the control in the hash's bucket.
222 */
223struct v4l2_ctrl_ref {
224 struct list_head node;
225 struct v4l2_ctrl_ref *next;
226 struct v4l2_ctrl *ctrl;
Hans Verkuileb5b16e2011-06-14 10:04:06 -0300227 struct v4l2_ctrl_helper *helper;
Hans Verkuil09965172010-08-01 14:32:42 -0300228};
229
230/** struct v4l2_ctrl_handler - The control handler keeps track of all the
231 * controls: both the controls owned by the handler and those inherited
232 * from other handlers.
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300233 * @_lock: Default for "lock".
Hans Verkuil09965172010-08-01 14:32:42 -0300234 * @lock: Lock to control access to this handler and its controls.
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300235 * May be replaced by the user right after init.
Hans Verkuil09965172010-08-01 14:32:42 -0300236 * @ctrls: The list of controls owned by this handler.
237 * @ctrl_refs: The list of control references.
238 * @cached: The last found control reference. It is common that the same
239 * control is needed multiple times, so this is a simple
240 * optimization.
241 * @buckets: Buckets for the hashing. Allows for quick control lookup.
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300242 * @notify: A notify callback that is called whenever the control changes value.
243 * Note that the handler's lock is held when the notify function
244 * is called!
245 * @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
Hans Verkuil09965172010-08-01 14:32:42 -0300246 * @nr_of_buckets: Total number of buckets in the array.
247 * @error: The error code of the first failed control addition.
248 */
249struct v4l2_ctrl_handler {
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300250 struct mutex _lock;
251 struct mutex *lock;
Hans Verkuil09965172010-08-01 14:32:42 -0300252 struct list_head ctrls;
253 struct list_head ctrl_refs;
254 struct v4l2_ctrl_ref *cached;
255 struct v4l2_ctrl_ref **buckets;
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300256 v4l2_ctrl_notify_fnc notify;
257 void *notify_priv;
Hans Verkuil09965172010-08-01 14:32:42 -0300258 u16 nr_of_buckets;
259 int error;
260};
261
262/** struct v4l2_ctrl_config - Control configuration structure.
263 * @ops: The control ops.
Hans Verkuil01760772014-04-27 03:22:17 -0300264 * @type_ops: The control type ops. Only needed for compound controls.
Hans Verkuil09965172010-08-01 14:32:42 -0300265 * @id: The control ID.
266 * @name: The control name.
267 * @type: The control type.
268 * @min: The control's minimum value.
269 * @max: The control's maximum value.
270 * @step: The control's step value for non-menu controls.
271 * @def: The control's default value.
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300272 * @dims: The size of each dimension.
Hans Verkuild9a25472014-06-12 07:54:16 -0300273 * @elem_size: The size in bytes of the control.
Hans Verkuil09965172010-08-01 14:32:42 -0300274 * @flags: The control's flags.
275 * @menu_skip_mask: The control's skip mask for menu controls. This makes it
276 * easy to skip menu items that are not valid. If bit X is set,
277 * then menu item X is skipped. Of course, this only works for
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300278 * menus with <= 64 menu items. There are no menus that come
Hans Verkuil09965172010-08-01 14:32:42 -0300279 * close to that number, so this is OK. Should we ever need more,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300280 * then this will have to be extended to a bit array.
Hans Verkuil09965172010-08-01 14:32:42 -0300281 * @qmenu: A const char * array for all menu items. Array entries that are
282 * empty strings ("") correspond to non-existing menu items (this
283 * is in addition to the menu_skip_mask above). The last entry
284 * must be NULL.
285 * @is_private: If set, then this control is private to its handler and it
286 * will not be added to any other handlers.
Hans Verkuil09965172010-08-01 14:32:42 -0300287 */
288struct v4l2_ctrl_config {
289 const struct v4l2_ctrl_ops *ops;
Hans Verkuil01760772014-04-27 03:22:17 -0300290 const struct v4l2_ctrl_type_ops *type_ops;
Hans Verkuil09965172010-08-01 14:32:42 -0300291 u32 id;
292 const char *name;
293 enum v4l2_ctrl_type type;
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300294 s64 min;
295 s64 max;
296 u64 step;
297 s64 def;
Hans Verkuil20d88ee2014-06-12 07:55:21 -0300298 u32 dims[V4L2_CTRL_MAX_DIMS];
Hans Verkuild9a25472014-06-12 07:54:16 -0300299 u32 elem_size;
Hans Verkuil09965172010-08-01 14:32:42 -0300300 u32 flags;
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300301 u64 menu_skip_mask;
Hans Verkuil513521e2010-12-29 14:25:52 -0300302 const char * const *qmenu;
Sakari Ailusce580fe2011-08-04 13:51:11 -0300303 const s64 *qmenu_int;
Hans Verkuil09965172010-08-01 14:32:42 -0300304 unsigned int is_private:1;
Hans Verkuil09965172010-08-01 14:32:42 -0300305};
306
307/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
308 *
309 * This works for all standard V4L2 controls.
310 * For non-standard controls it will only fill in the given arguments
311 * and @name will be NULL.
312 *
313 * This function will overwrite the contents of @name, @type and @flags.
314 * The contents of @min, @max, @step and @def may be modified depending on
315 * the type.
316 *
317 * Do not use in drivers! It is used internally for backwards compatibility
318 * control handling only. Once all drivers are converted to use the new
319 * control framework this function will no longer be exported.
320 */
321void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300322 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags);
Hans Verkuil09965172010-08-01 14:32:42 -0300323
324
Andy Walls6cd247e2013-03-09 05:55:11 -0300325/** v4l2_ctrl_handler_init_class() - Initialize the control handler.
Hans Verkuil09965172010-08-01 14:32:42 -0300326 * @hdl: The control handler.
327 * @nr_of_controls_hint: A hint of how many controls this handler is
328 * expected to refer to. This is the total number, so including
329 * any inherited controls. It doesn't have to be precise, but if
330 * it is way off, then you either waste memory (too many buckets
331 * are allocated) or the control lookup becomes slower (not enough
332 * buckets are allocated, so there are more slow list lookups).
333 * It will always work, though.
Andy Walls6cd247e2013-03-09 05:55:11 -0300334 * @key: Used by the lock validator if CONFIG_LOCKDEP is set.
335 * @name: Used by the lock validator if CONFIG_LOCKDEP is set.
Hans Verkuil09965172010-08-01 14:32:42 -0300336 *
337 * Returns an error if the buckets could not be allocated. This error will
338 * also be stored in @hdl->error.
Andy Walls6cd247e2013-03-09 05:55:11 -0300339 *
340 * Never use this call directly, always use the v4l2_ctrl_handler_init
341 * macro that hides the @key and @name arguments.
Hans Verkuil09965172010-08-01 14:32:42 -0300342 */
Andy Walls6cd247e2013-03-09 05:55:11 -0300343int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
344 unsigned nr_of_controls_hint,
345 struct lock_class_key *key, const char *name);
346
347#ifdef CONFIG_LOCKDEP
348#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
349( \
350 ({ \
351 static struct lock_class_key _key; \
352 v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \
353 &_key, \
354 KBUILD_BASENAME ":" \
355 __stringify(__LINE__) ":" \
356 "(" #hdl ")->_lock"); \
357 }) \
358)
359#else
360#define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \
361 v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL)
362#endif
Hans Verkuil09965172010-08-01 14:32:42 -0300363
364/** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free
365 * the control list.
366 * @hdl: The control handler.
367 *
368 * Does nothing if @hdl == NULL.
369 */
370void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl);
371
Sakari Ailus605b3842014-06-12 13:09:39 -0300372/** v4l2_ctrl_lock() - Helper function to lock the handler
373 * associated with the control.
374 * @ctrl: The control to lock.
375 */
376static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
377{
378 mutex_lock(ctrl->handler->lock);
379}
380
381/** v4l2_ctrl_unlock() - Helper function to unlock the handler
382 * associated with the control.
383 * @ctrl: The control to unlock.
384 */
385static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
386{
387 mutex_unlock(ctrl->handler->lock);
388}
389
Hans Verkuil09965172010-08-01 14:32:42 -0300390/** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
391 * to the handler to initialize the hardware to the current control values.
392 * @hdl: The control handler.
393 *
394 * Button controls will be skipped, as are read-only controls.
395 *
396 * If @hdl == NULL, then this just returns 0.
397 */
398int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
399
400/** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler.
401 * @hdl: The control handler.
402 * @prefix: The prefix to use when logging the control values. If the
403 * prefix does not end with a space, then ": " will be added
404 * after the prefix. If @prefix == NULL, then no prefix will be
405 * used.
406 *
407 * For use with VIDIOC_LOG_STATUS.
408 *
409 * Does nothing if @hdl == NULL.
410 */
411void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
412 const char *prefix);
413
414/** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
415 * control.
416 * @hdl: The control handler.
417 * @cfg: The control's configuration data.
418 * @priv: The control's driver-specific private data.
419 *
420 * If the &v4l2_ctrl struct could not be allocated then NULL is returned
421 * and @hdl->error is set to the error code (if it wasn't set already).
422 */
423struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
424 const struct v4l2_ctrl_config *cfg, void *priv);
425
426/** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control.
427 * @hdl: The control handler.
428 * @ops: The control ops.
429 * @id: The control ID.
430 * @min: The control's minimum value.
431 * @max: The control's maximum value.
432 * @step: The control's step value
433 * @def: The control's default value.
434 *
435 * If the &v4l2_ctrl struct could not be allocated, or the control
436 * ID is not known, then NULL is returned and @hdl->error is set to the
437 * appropriate error code (if it wasn't set already).
438 *
439 * If @id refers to a menu control, then this function will return NULL.
440 *
441 * Use v4l2_ctrl_new_std_menu() when adding menu controls.
442 */
443struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
444 const struct v4l2_ctrl_ops *ops,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300445 u32 id, s64 min, s64 max, u64 step, s64 def);
Hans Verkuil09965172010-08-01 14:32:42 -0300446
447/** v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control.
448 * @hdl: The control handler.
449 * @ops: The control ops.
450 * @id: The control ID.
451 * @max: The control's maximum value.
452 * @mask: The control's skip mask for menu controls. This makes it
453 * easy to skip menu items that are not valid. If bit X is set,
454 * then menu item X is skipped. Of course, this only works for
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300455 * menus with <= 64 menu items. There are no menus that come
Hans Verkuil09965172010-08-01 14:32:42 -0300456 * close to that number, so this is OK. Should we ever need more,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300457 * then this will have to be extended to a bit array.
Hans Verkuil09965172010-08-01 14:32:42 -0300458 * @def: The control's default value.
459 *
460 * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value
461 * determines which menu items are to be skipped.
462 *
463 * If @id refers to a non-menu control, then this function will return NULL.
464 */
465struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
466 const struct v4l2_ctrl_ops *ops,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300467 u32 id, u8 max, u64 mask, u8 def);
Hans Verkuil09965172010-08-01 14:32:42 -0300468
Lad, Prabhakar117a7112012-09-18 15:54:38 -0300469/** v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
470 * with driver specific menu.
471 * @hdl: The control handler.
472 * @ops: The control ops.
473 * @id: The control ID.
474 * @max: The control's maximum value.
475 * @mask: The control's skip mask for menu controls. This makes it
476 * easy to skip menu items that are not valid. If bit X is set,
477 * then menu item X is skipped. Of course, this only works for
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300478 * menus with <= 64 menu items. There are no menus that come
Lad, Prabhakar117a7112012-09-18 15:54:38 -0300479 * close to that number, so this is OK. Should we ever need more,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300480 * then this will have to be extended to a bit array.
Lad, Prabhakar117a7112012-09-18 15:54:38 -0300481 * @def: The control's default value.
482 * @qmenu: The new menu.
483 *
484 * Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific
485 * menu of this control.
486 *
487 */
488struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300489 const struct v4l2_ctrl_ops *ops, u32 id, u8 max,
490 u64 mask, u8 def, const char * const *qmenu);
Lad, Prabhakar117a7112012-09-18 15:54:38 -0300491
Sylwester Nawrocki515f3282012-05-06 15:30:44 -0300492/** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
493 * @hdl: The control handler.
494 * @ops: The control ops.
495 * @id: The control ID.
496 * @max: The control's maximum value.
497 * @def: The control's default value.
498 * @qmenu_int: The control's menu entries.
499 *
500 * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly
501 * takes as an argument an array of integers determining the menu items.
502 *
503 * If @id refers to a non-integer-menu control, then this function will return NULL.
504 */
505struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
506 const struct v4l2_ctrl_ops *ops,
Hans Verkuil0ba2aeb2014-04-16 09:41:25 -0300507 u32 id, u8 max, u8 def, const s64 *qmenu_int);
Sylwester Nawrocki515f3282012-05-06 15:30:44 -0300508
Hans Verkuil09965172010-08-01 14:32:42 -0300509/** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler.
510 * @hdl: The control handler.
511 * @ctrl: The control to add.
512 *
513 * It will return NULL if it was unable to add the control reference.
514 * If the control already belonged to the handler, then it will do
515 * nothing and just return @ctrl.
516 */
517struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
518 struct v4l2_ctrl *ctrl);
519
520/** v4l2_ctrl_add_handler() - Add all controls from handler @add to
521 * handler @hdl.
522 * @hdl: The control handler.
523 * @add: The control handler whose controls you want to add to
524 * the @hdl control handler.
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300525 * @filter: This function will filter which controls should be added.
Hans Verkuil09965172010-08-01 14:32:42 -0300526 *
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300527 * Does nothing if either of the two handlers is a NULL pointer.
528 * If @filter is NULL, then all controls are added. Otherwise only those
529 * controls for which @filter returns true will be added.
Hans Verkuil09965172010-08-01 14:32:42 -0300530 * In case of an error @hdl->error will be set to the error code (if it
531 * wasn't set already).
532 */
533int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300534 struct v4l2_ctrl_handler *add,
535 bool (*filter)(const struct v4l2_ctrl *ctrl));
Hans Verkuil09965172010-08-01 14:32:42 -0300536
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300537/** v4l2_ctrl_radio_filter() - Standard filter for radio controls.
538 * @ctrl: The control that is filtered.
539 *
540 * This will return true for any controls that are valid for radio device
541 * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM
542 * transmitter class controls.
543 *
544 * This function is to be used with v4l2_ctrl_add_handler().
545 */
546bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
Hans Verkuil09965172010-08-01 14:32:42 -0300547
548/** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
549 * @ncontrols: The number of controls in this cluster.
550 * @controls: The cluster control array of size @ncontrols.
551 */
552void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
553
554
Hans Verkuil72d877c2011-06-10 05:44:36 -0300555/** v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to
556 * that cluster and set it up for autofoo/foo-type handling.
557 * @ncontrols: The number of controls in this cluster.
558 * @controls: The cluster control array of size @ncontrols. The first control
559 * must be the 'auto' control (e.g. autogain, autoexposure, etc.)
560 * @manual_val: The value for the first control in the cluster that equals the
561 * manual setting.
562 * @set_volatile: If true, then all controls except the first auto control will
Hans Verkuil88365102011-08-26 07:35:14 -0300563 * be volatile.
Hans Verkuil72d877c2011-06-10 05:44:36 -0300564 *
565 * Use for control groups where one control selects some automatic feature and
566 * the other controls are only active whenever the automatic feature is turned
567 * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs
568 * red and blue balance, etc.
569 *
570 * The behavior of such controls is as follows:
571 *
572 * When the autofoo control is set to automatic, then any manual controls
573 * are set to inactive and any reads will call g_volatile_ctrl (if the control
574 * was marked volatile).
575 *
576 * When the autofoo control is set to manual, then any manual controls will
577 * be marked active, and any reads will just return the current value without
578 * going through g_volatile_ctrl.
579 *
580 * In addition, this function will set the V4L2_CTRL_FLAG_UPDATE flag
581 * on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s)
582 * if autofoo is in auto mode.
583 */
584void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
585 u8 manual_val, bool set_volatile);
586
587
Hans Verkuil09965172010-08-01 14:32:42 -0300588/** v4l2_ctrl_find() - Find a control with the given ID.
589 * @hdl: The control handler.
590 * @id: The control ID to find.
591 *
592 * If @hdl == NULL this will return NULL as well. Will lock the handler so
593 * do not use from inside &v4l2_ctrl_ops.
594 */
595struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
596
597/** v4l2_ctrl_activate() - Make the control active or inactive.
598 * @ctrl: The control to (de)activate.
599 * @active: True if the control should become active.
600 *
601 * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically.
602 * Does nothing if @ctrl == NULL.
603 * This will usually be called from within the s_ctrl op.
Hans Verkuil6e239392011-06-07 11:13:44 -0300604 * The V4L2_EVENT_CTRL event will be generated afterwards.
Hans Verkuil09965172010-08-01 14:32:42 -0300605 *
Hans Verkuil6e239392011-06-07 11:13:44 -0300606 * This function assumes that the control handler is locked.
Hans Verkuil09965172010-08-01 14:32:42 -0300607 */
608void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
609
610/** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
611 * @ctrl: The control to (de)activate.
612 * @grabbed: True if the control should become grabbed.
613 *
614 * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
615 * Does nothing if @ctrl == NULL.
Hans Verkuil6e239392011-06-07 11:13:44 -0300616 * The V4L2_EVENT_CTRL event will be generated afterwards.
Hans Verkuil09965172010-08-01 14:32:42 -0300617 * This will usually be called when starting or stopping streaming in the
618 * driver.
619 *
Hans Verkuil6e239392011-06-07 11:13:44 -0300620 * This function assumes that the control handler is not locked and will
621 * take the lock itself.
Hans Verkuil09965172010-08-01 14:32:42 -0300622 */
623void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
624
Sakari Ailus5a573922014-06-12 13:09:40 -0300625
626/** __v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range() */
627int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
628 s64 min, s64 max, u64 step, s64 def);
629
Sylwester Nawrocki2ccbe772013-01-19 15:51:55 -0300630/** v4l2_ctrl_modify_range() - Update the range of a control.
631 * @ctrl: The control to update.
632 * @min: The control's minimum value.
633 * @max: The control's maximum value.
634 * @step: The control's step value
635 * @def: The control's default value.
636 *
637 * Update the range of a control on the fly. This works for control types
638 * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
639 * @step value is interpreted as a menu_skip_mask.
640 *
641 * An error is returned if one of the range arguments is invalid for this
642 * control type.
643 *
644 * This function assumes that the control handler is not locked and will
645 * take the lock itself.
646 */
Sakari Ailus5a573922014-06-12 13:09:40 -0300647static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
648 s64 min, s64 max, u64 step, s64 def)
649{
650 int rval;
651
652 v4l2_ctrl_lock(ctrl);
653 rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def);
654 v4l2_ctrl_unlock(ctrl);
655
656 return rval;
657}
Sylwester Nawrocki2ccbe772013-01-19 15:51:55 -0300658
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300659/** v4l2_ctrl_notify() - Function to set a notify callback for a control.
660 * @ctrl: The control.
661 * @notify: The callback function.
662 * @priv: The callback private handle, passed as argument to the callback.
663 *
664 * This function sets a callback function for the control. If @ctrl is NULL,
665 * then it will do nothing. If @notify is NULL, then the notify callback will
666 * be removed.
667 *
668 * There can be only one notify. If another already exists, then a WARN_ON
669 * will be issued and the function will do nothing.
670 */
671void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv);
672
Hans Verkuil79fbc202014-11-23 09:39:54 -0300673/** v4l2_ctrl_get_name() - Get the name of the control
674 * @id: The control ID.
675 *
676 * This function returns the name of the given control ID or NULL if it isn't
677 * a known control.
678 */
679const char *v4l2_ctrl_get_name(u32 id);
680
681/** v4l2_ctrl_get_menu() - Get the menu string array of the control
682 * @id: The control ID.
683 *
684 * This function returns the NULL-terminated menu string array name of the
685 * given control ID or NULL if it isn't a known menu control.
686 */
687const char * const *v4l2_ctrl_get_menu(u32 id);
688
689/** v4l2_ctrl_get_int_menu() - Get the integer menu array of the control
690 * @id: The control ID.
691 * @len: The size of the integer array.
692 *
693 * This function returns the integer array of the given control ID or NULL if it
694 * if it isn't a known integer menu control.
695 */
696const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len);
697
Hans Verkuil09965172010-08-01 14:32:42 -0300698/** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
699 * @ctrl: The control.
700 *
701 * This returns the control's value safely by going through the control
702 * framework. This function will lock the control's handler, so it cannot be
703 * used from within the &v4l2_ctrl_ops functions.
704 *
705 * This function is for integer type controls only.
706 */
707s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
708
Sakari Ailus0c4348a2014-06-12 13:09:42 -0300709/** __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl(). */
710int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
Hans Verkuil09965172010-08-01 14:32:42 -0300711/** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver.
712 * @ctrl: The control.
713 * @val: The new value.
714 *
715 * This set the control's new value safely by going through the control
716 * framework. This function will lock the control's handler, so it cannot be
717 * used from within the &v4l2_ctrl_ops functions.
718 *
719 * This function is for integer type controls only.
720 */
Sakari Ailus0c4348a2014-06-12 13:09:42 -0300721static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
722{
723 int rval;
724
725 v4l2_ctrl_lock(ctrl);
726 rval = __v4l2_ctrl_s_ctrl(ctrl, val);
727 v4l2_ctrl_unlock(ctrl);
728
729 return rval;
730}
Hans Verkuil09965172010-08-01 14:32:42 -0300731
Laurent Pinchart03d52852012-07-23 09:15:21 -0300732/** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value from within a driver.
733 * @ctrl: The control.
734 *
735 * This returns the control's value safely by going through the control
736 * framework. This function will lock the control's handler, so it cannot be
737 * used from within the &v4l2_ctrl_ops functions.
738 *
739 * This function is for 64-bit integer type controls only.
740 */
741s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
742
Sakari Ailus0c4348a2014-06-12 13:09:42 -0300743/** __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64(). */
744int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
745
Laurent Pinchart03d52852012-07-23 09:15:21 -0300746/** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value from within a driver.
747 * @ctrl: The control.
748 * @val: The new value.
749 *
750 * This set the control's new value safely by going through the control
751 * framework. This function will lock the control's handler, so it cannot be
752 * used from within the &v4l2_ctrl_ops functions.
753 *
754 * This function is for 64-bit integer type controls only.
755 */
Sakari Ailus0c4348a2014-06-12 13:09:42 -0300756static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
757{
758 int rval;
759
760 v4l2_ctrl_lock(ctrl);
761 rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val);
762 v4l2_ctrl_unlock(ctrl);
763
764 return rval;
765}
Laurent Pinchart03d52852012-07-23 09:15:21 -0300766
Hans Verkuil5d0360a2014-07-21 10:45:42 -0300767/** __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string(). */
768int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s);
769
770/** v4l2_ctrl_s_ctrl_string() - Helper function to set a control's string value from within a driver.
771 * @ctrl: The control.
772 * @s: The new string.
773 *
774 * This set the control's new string safely by going through the control
775 * framework. This function will lock the control's handler, so it cannot be
776 * used from within the &v4l2_ctrl_ops functions.
777 *
778 * This function is for string type controls only.
779 */
780static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
781{
782 int rval;
783
784 v4l2_ctrl_lock(ctrl);
785 rval = __v4l2_ctrl_s_ctrl_string(ctrl, s);
786 v4l2_ctrl_unlock(ctrl);
787
788 return rval;
789}
790
Hans Verkuilce727572011-06-10 05:56:39 -0300791/* Internal helper functions that deal with control events. */
Hans de Goede3e3661492012-04-08 12:59:47 -0300792extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
793void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);
794void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
Hans Verkuil6e239392011-06-07 11:13:44 -0300795
Hans Verkuile2ecb252012-02-02 08:20:53 -0300796/* Can be used as a vidioc_log_status function that just dumps all controls
797 associated with the filehandle. */
798int v4l2_ctrl_log_status(struct file *file, void *fh);
799
Hans Verkuila26243b2012-01-27 16:18:42 -0300800/* Can be used as a vidioc_subscribe_event function that just subscribes
801 control events. */
802int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
Hans Verkuil85f5fe32012-09-04 11:46:09 -0300803 const struct v4l2_event_subscription *sub);
Hans Verkuila26243b2012-01-27 16:18:42 -0300804
805/* Can be used as a poll function that just polls for control events. */
806unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
807
Hans Verkuil09965172010-08-01 14:32:42 -0300808/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
809int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
Hans Verkuild9a25472014-06-12 07:54:16 -0300810int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc);
Hans Verkuil09965172010-08-01 14:32:42 -0300811int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
812int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
Hans Verkuilab892ba2011-06-07 06:47:18 -0300813int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
814 struct v4l2_control *ctrl);
Hans Verkuil09965172010-08-01 14:32:42 -0300815int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
816int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
Hans Verkuilab892ba2011-06-07 06:47:18 -0300817int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
818 struct v4l2_ext_controls *c);
Hans Verkuil09965172010-08-01 14:32:42 -0300819
820/* Helpers for subdevices. If the associated ctrl_handler == NULL then they
821 will all return -EINVAL. */
822int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
823int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
824int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
825int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
826int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
827int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
828int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
829
Sylwester Nawrocki22fa4272013-01-22 19:00:23 -0300830/* Can be used as a subscribe_event function that just subscribes control
831 events. */
832int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
833 struct v4l2_event_subscription *sub);
834
Sylwester Nawrockiffa9b9f2013-01-22 19:01:02 -0300835/* Log all controls owned by subdev's control handler. */
836int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd);
837
Hans Verkuil09965172010-08-01 14:32:42 -0300838#endif