blob: f00d42bc01a69ea5b47673ef838ee524adc13218 [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>
Laurent Pinchart01c40c02010-11-19 11:20:06 -030025#include <linux/videodev2.h>
Hans Verkuil09965172010-08-01 14:32:42 -030026
27/* forward references */
Laurent Pinchart528f0f72012-04-23 08:20:35 -030028struct file;
Hans Verkuil09965172010-08-01 14:32:42 -030029struct v4l2_ctrl_handler;
Hans Verkuileb5b16e2011-06-14 10:04:06 -030030struct v4l2_ctrl_helper;
Hans Verkuil09965172010-08-01 14:32:42 -030031struct v4l2_ctrl;
32struct video_device;
33struct v4l2_subdev;
Hans Verkuil77068d32011-06-13 18:55:58 -030034struct v4l2_subscribed_event;
Hans Verkuil6e239392011-06-07 11:13:44 -030035struct v4l2_fh;
Hans Verkuila26243b2012-01-27 16:18:42 -030036struct poll_table_struct;
Hans Verkuil09965172010-08-01 14:32:42 -030037
38/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
39 * @g_volatile_ctrl: Get a new value for this control. Generally only relevant
40 * for volatile (and usually read-only) controls such as a control
41 * that returns the current signal strength which changes
42 * continuously.
43 * If not set, then the currently cached value will be returned.
44 * @try_ctrl: Test whether the control's value is valid. Only relevant when
45 * the usual min/max/step checks are not sufficient.
46 * @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The
47 * ctrl->handler->lock is held when these ops are called, so no
48 * one else can access controls owned by that handler.
49 */
50struct v4l2_ctrl_ops {
51 int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
52 int (*try_ctrl)(struct v4l2_ctrl *ctrl);
53 int (*s_ctrl)(struct v4l2_ctrl *ctrl);
54};
55
Hans Verkuil8ac7a942012-09-07 04:46:39 -030056typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
57
Hans Verkuil09965172010-08-01 14:32:42 -030058/** struct v4l2_ctrl - The control structure.
59 * @node: The list node.
Hans Verkuil77068d32011-06-13 18:55:58 -030060 * @ev_subs: The list of control event subscriptions.
Hans Verkuil09965172010-08-01 14:32:42 -030061 * @handler: The handler that owns the control.
62 * @cluster: Point to start of cluster array.
63 * @ncontrols: Number of controls in cluster array.
Hans Verkuil09965172010-08-01 14:32:42 -030064 * @done: Internal flag: set for each processed control.
Hans Verkuil2a863792011-01-11 14:45:03 -030065 * @is_new: Set when the user specified a new value for this control. It
66 * is also set when called from v4l2_ctrl_handler_setup. Drivers
67 * should never set this flag.
Hans Verkuil09965172010-08-01 14:32:42 -030068 * @is_private: If set, then this control is private to its handler and it
69 * will not be added to any other handlers. Drivers can set
70 * this flag.
Hans Verkuil72d877c2011-06-10 05:44:36 -030071 * @is_auto: If set, then this control selects whether the other cluster
72 * members are in 'automatic' mode or 'manual' mode. This is
73 * used for autogain/gain type clusters. Drivers should never
74 * set this flag directly.
Hans Verkuil5626b8c2011-08-26 07:53:53 -030075 * @has_volatiles: If set, then one or more members of the cluster are volatile.
76 * Drivers should never touch this flag.
Hans Verkuil8ac7a942012-09-07 04:46:39 -030077 * @call_notify: If set, then call the handler's notify function whenever the
78 * control's value changes.
Hans Verkuil72d877c2011-06-10 05:44:36 -030079 * @manual_mode_value: If the is_auto flag is set, then this is the value
80 * of the auto control that determines if that control is in
81 * manual mode. So if the value of the auto control equals this
82 * value, then the whole cluster is in manual mode. Drivers should
83 * never set this flag directly.
Hans Verkuil09965172010-08-01 14:32:42 -030084 * @ops: The control ops.
85 * @id: The control ID.
86 * @name: The control name.
87 * @type: The control type.
88 * @minimum: The control's minimum value.
89 * @maximum: The control's maximum value.
90 * @default_value: The control's default value.
91 * @step: The control's step value for non-menu controls.
92 * @menu_skip_mask: The control's skip mask for menu controls. This makes it
93 * easy to skip menu items that are not valid. If bit X is set,
94 * then menu item X is skipped. Of course, this only works for
95 * menus with <= 32 menu items. There are no menus that come
96 * close to that number, so this is OK. Should we ever need more,
97 * then this will have to be extended to a u64 or a bit array.
98 * @qmenu: A const char * array for all menu items. Array entries that are
99 * empty strings ("") correspond to non-existing menu items (this
100 * is in addition to the menu_skip_mask above). The last entry
101 * must be NULL.
102 * @flags: The control's flags.
103 * @cur: The control's current value.
104 * @val: The control's new s32 value.
105 * @val64: The control's new s64 value.
106 * @string: The control's new string value.
107 * @priv: The control's private pointer. For use by the driver. It is
108 * untouched by the control framework. Note that this pointer is
109 * not freed when the control is deleted. Should this be needed
110 * then a new internal bitfield can be added to tell the framework
111 * to free this pointer.
112 */
113struct v4l2_ctrl {
114 /* Administrative fields */
115 struct list_head node;
Hans Verkuil77068d32011-06-13 18:55:58 -0300116 struct list_head ev_subs;
Hans Verkuil09965172010-08-01 14:32:42 -0300117 struct v4l2_ctrl_handler *handler;
118 struct v4l2_ctrl **cluster;
119 unsigned ncontrols;
Hans Verkuil09965172010-08-01 14:32:42 -0300120 unsigned int done:1;
121
Hans Verkuil2a863792011-01-11 14:45:03 -0300122 unsigned int is_new:1;
Hans Verkuil09965172010-08-01 14:32:42 -0300123 unsigned int is_private:1;
Hans Verkuil72d877c2011-06-10 05:44:36 -0300124 unsigned int is_auto:1;
Hans Verkuil5626b8c2011-08-26 07:53:53 -0300125 unsigned int has_volatiles:1;
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300126 unsigned int call_notify:1;
Hans Verkuil82a7c042011-06-28 10:43:13 -0300127 unsigned int manual_mode_value:8;
Hans Verkuil09965172010-08-01 14:32:42 -0300128
129 const struct v4l2_ctrl_ops *ops;
130 u32 id;
131 const char *name;
132 enum v4l2_ctrl_type type;
133 s32 minimum, maximum, default_value;
134 union {
135 u32 step;
136 u32 menu_skip_mask;
137 };
Sakari Ailusce580fe2011-08-04 13:51:11 -0300138 union {
139 const char * const *qmenu;
140 const s64 *qmenu_int;
141 };
Hans Verkuil09965172010-08-01 14:32:42 -0300142 unsigned long flags;
143 union {
144 s32 val;
145 s64 val64;
146 char *string;
147 } cur;
148 union {
149 s32 val;
150 s64 val64;
151 char *string;
152 };
153 void *priv;
154};
155
156/** struct v4l2_ctrl_ref - The control reference.
157 * @node: List node for the sorted list.
158 * @next: Single-link list node for the hash.
159 * @ctrl: The actual control information.
Hans Verkuileb5b16e2011-06-14 10:04:06 -0300160 * @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls().
Hans Verkuil09965172010-08-01 14:32:42 -0300161 *
162 * Each control handler has a list of these refs. The list_head is used to
163 * keep a sorted-by-control-ID list of all controls, while the next pointer
164 * is used to link the control in the hash's bucket.
165 */
166struct v4l2_ctrl_ref {
167 struct list_head node;
168 struct v4l2_ctrl_ref *next;
169 struct v4l2_ctrl *ctrl;
Hans Verkuileb5b16e2011-06-14 10:04:06 -0300170 struct v4l2_ctrl_helper *helper;
Hans Verkuil09965172010-08-01 14:32:42 -0300171};
172
173/** struct v4l2_ctrl_handler - The control handler keeps track of all the
174 * controls: both the controls owned by the handler and those inherited
175 * from other handlers.
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300176 * @_lock: Default for "lock".
Hans Verkuil09965172010-08-01 14:32:42 -0300177 * @lock: Lock to control access to this handler and its controls.
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300178 * May be replaced by the user right after init.
Hans Verkuil09965172010-08-01 14:32:42 -0300179 * @ctrls: The list of controls owned by this handler.
180 * @ctrl_refs: The list of control references.
181 * @cached: The last found control reference. It is common that the same
182 * control is needed multiple times, so this is a simple
183 * optimization.
184 * @buckets: Buckets for the hashing. Allows for quick control lookup.
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300185 * @notify: A notify callback that is called whenever the control changes value.
186 * Note that the handler's lock is held when the notify function
187 * is called!
188 * @notify_priv: Passed as argument to the v4l2_ctrl notify callback.
Hans Verkuil09965172010-08-01 14:32:42 -0300189 * @nr_of_buckets: Total number of buckets in the array.
190 * @error: The error code of the first failed control addition.
191 */
192struct v4l2_ctrl_handler {
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300193 struct mutex _lock;
194 struct mutex *lock;
Hans Verkuil09965172010-08-01 14:32:42 -0300195 struct list_head ctrls;
196 struct list_head ctrl_refs;
197 struct v4l2_ctrl_ref *cached;
198 struct v4l2_ctrl_ref **buckets;
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300199 v4l2_ctrl_notify_fnc notify;
200 void *notify_priv;
Hans Verkuil09965172010-08-01 14:32:42 -0300201 u16 nr_of_buckets;
202 int error;
203};
204
205/** struct v4l2_ctrl_config - Control configuration structure.
206 * @ops: The control ops.
207 * @id: The control ID.
208 * @name: The control name.
209 * @type: The control type.
210 * @min: The control's minimum value.
211 * @max: The control's maximum value.
212 * @step: The control's step value for non-menu controls.
213 * @def: The control's default value.
214 * @flags: The control's flags.
215 * @menu_skip_mask: The control's skip mask for menu controls. This makes it
216 * easy to skip menu items that are not valid. If bit X is set,
217 * then menu item X is skipped. Of course, this only works for
218 * menus with <= 32 menu items. There are no menus that come
219 * close to that number, so this is OK. Should we ever need more,
220 * then this will have to be extended to a u64 or a bit array.
221 * @qmenu: A const char * array for all menu items. Array entries that are
222 * empty strings ("") correspond to non-existing menu items (this
223 * is in addition to the menu_skip_mask above). The last entry
224 * must be NULL.
225 * @is_private: If set, then this control is private to its handler and it
226 * will not be added to any other handlers.
Hans Verkuil09965172010-08-01 14:32:42 -0300227 */
228struct v4l2_ctrl_config {
229 const struct v4l2_ctrl_ops *ops;
230 u32 id;
231 const char *name;
232 enum v4l2_ctrl_type type;
233 s32 min;
234 s32 max;
235 u32 step;
236 s32 def;
237 u32 flags;
238 u32 menu_skip_mask;
Hans Verkuil513521e2010-12-29 14:25:52 -0300239 const char * const *qmenu;
Sakari Ailusce580fe2011-08-04 13:51:11 -0300240 const s64 *qmenu_int;
Hans Verkuil09965172010-08-01 14:32:42 -0300241 unsigned int is_private:1;
Hans Verkuil09965172010-08-01 14:32:42 -0300242};
243
244/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
245 *
246 * This works for all standard V4L2 controls.
247 * For non-standard controls it will only fill in the given arguments
248 * and @name will be NULL.
249 *
250 * This function will overwrite the contents of @name, @type and @flags.
251 * The contents of @min, @max, @step and @def may be modified depending on
252 * the type.
253 *
254 * Do not use in drivers! It is used internally for backwards compatibility
255 * control handling only. Once all drivers are converted to use the new
256 * control framework this function will no longer be exported.
257 */
258void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
259 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags);
260
261
262/** v4l2_ctrl_handler_init() - Initialize the control handler.
263 * @hdl: The control handler.
264 * @nr_of_controls_hint: A hint of how many controls this handler is
265 * expected to refer to. This is the total number, so including
266 * any inherited controls. It doesn't have to be precise, but if
267 * it is way off, then you either waste memory (too many buckets
268 * are allocated) or the control lookup becomes slower (not enough
269 * buckets are allocated, so there are more slow list lookups).
270 * It will always work, though.
271 *
272 * Returns an error if the buckets could not be allocated. This error will
273 * also be stored in @hdl->error.
274 */
275int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
276 unsigned nr_of_controls_hint);
277
278/** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free
279 * the control list.
280 * @hdl: The control handler.
281 *
282 * Does nothing if @hdl == NULL.
283 */
284void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl);
285
286/** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
287 * to the handler to initialize the hardware to the current control values.
288 * @hdl: The control handler.
289 *
290 * Button controls will be skipped, as are read-only controls.
291 *
292 * If @hdl == NULL, then this just returns 0.
293 */
294int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
295
296/** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler.
297 * @hdl: The control handler.
298 * @prefix: The prefix to use when logging the control values. If the
299 * prefix does not end with a space, then ": " will be added
300 * after the prefix. If @prefix == NULL, then no prefix will be
301 * used.
302 *
303 * For use with VIDIOC_LOG_STATUS.
304 *
305 * Does nothing if @hdl == NULL.
306 */
307void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
308 const char *prefix);
309
310/** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
311 * control.
312 * @hdl: The control handler.
313 * @cfg: The control's configuration data.
314 * @priv: The control's driver-specific private data.
315 *
316 * If the &v4l2_ctrl struct could not be allocated then NULL is returned
317 * and @hdl->error is set to the error code (if it wasn't set already).
318 */
319struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
320 const struct v4l2_ctrl_config *cfg, void *priv);
321
322/** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control.
323 * @hdl: The control handler.
324 * @ops: The control ops.
325 * @id: The control ID.
326 * @min: The control's minimum value.
327 * @max: The control's maximum value.
328 * @step: The control's step value
329 * @def: The control's default value.
330 *
331 * If the &v4l2_ctrl struct could not be allocated, or the control
332 * ID is not known, then NULL is returned and @hdl->error is set to the
333 * appropriate error code (if it wasn't set already).
334 *
335 * If @id refers to a menu control, then this function will return NULL.
336 *
337 * Use v4l2_ctrl_new_std_menu() when adding menu controls.
338 */
339struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
340 const struct v4l2_ctrl_ops *ops,
341 u32 id, s32 min, s32 max, u32 step, s32 def);
342
343/** v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control.
344 * @hdl: The control handler.
345 * @ops: The control ops.
346 * @id: The control ID.
347 * @max: The control's maximum value.
348 * @mask: The control's skip mask for menu controls. This makes it
349 * easy to skip menu items that are not valid. If bit X is set,
350 * then menu item X is skipped. Of course, this only works for
351 * menus with <= 32 menu items. There are no menus that come
352 * close to that number, so this is OK. Should we ever need more,
353 * then this will have to be extended to a u64 or a bit array.
354 * @def: The control's default value.
355 *
356 * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value
357 * determines which menu items are to be skipped.
358 *
359 * If @id refers to a non-menu control, then this function will return NULL.
360 */
361struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
362 const struct v4l2_ctrl_ops *ops,
363 u32 id, s32 max, s32 mask, s32 def);
364
Lad, Prabhakar117a7112012-09-18 15:54:38 -0300365/** v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
366 * with driver specific menu.
367 * @hdl: The control handler.
368 * @ops: The control ops.
369 * @id: The control ID.
370 * @max: The control's maximum value.
371 * @mask: The control's skip mask for menu controls. This makes it
372 * easy to skip menu items that are not valid. If bit X is set,
373 * then menu item X is skipped. Of course, this only works for
374 * menus with <= 32 menu items. There are no menus that come
375 * close to that number, so this is OK. Should we ever need more,
376 * then this will have to be extended to a u64 or a bit array.
377 * @def: The control's default value.
378 * @qmenu: The new menu.
379 *
380 * Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific
381 * menu of this control.
382 *
383 */
384struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
385 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
386 s32 mask, s32 def, const char * const *qmenu);
387
Sylwester Nawrocki515f3282012-05-06 15:30:44 -0300388/** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
389 * @hdl: The control handler.
390 * @ops: The control ops.
391 * @id: The control ID.
392 * @max: The control's maximum value.
393 * @def: The control's default value.
394 * @qmenu_int: The control's menu entries.
395 *
396 * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly
397 * takes as an argument an array of integers determining the menu items.
398 *
399 * If @id refers to a non-integer-menu control, then this function will return NULL.
400 */
401struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
402 const struct v4l2_ctrl_ops *ops,
403 u32 id, s32 max, s32 def, const s64 *qmenu_int);
404
Hans Verkuil09965172010-08-01 14:32:42 -0300405/** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler.
406 * @hdl: The control handler.
407 * @ctrl: The control to add.
408 *
409 * It will return NULL if it was unable to add the control reference.
410 * If the control already belonged to the handler, then it will do
411 * nothing and just return @ctrl.
412 */
413struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
414 struct v4l2_ctrl *ctrl);
415
416/** v4l2_ctrl_add_handler() - Add all controls from handler @add to
417 * handler @hdl.
418 * @hdl: The control handler.
419 * @add: The control handler whose controls you want to add to
420 * the @hdl control handler.
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300421 * @filter: This function will filter which controls should be added.
Hans Verkuil09965172010-08-01 14:32:42 -0300422 *
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300423 * Does nothing if either of the two handlers is a NULL pointer.
424 * If @filter is NULL, then all controls are added. Otherwise only those
425 * controls for which @filter returns true will be added.
Hans Verkuil09965172010-08-01 14:32:42 -0300426 * In case of an error @hdl->error will be set to the error code (if it
427 * wasn't set already).
428 */
429int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300430 struct v4l2_ctrl_handler *add,
431 bool (*filter)(const struct v4l2_ctrl *ctrl));
Hans Verkuil09965172010-08-01 14:32:42 -0300432
Hans Verkuil34a6b7d2012-09-14 07:15:03 -0300433/** v4l2_ctrl_radio_filter() - Standard filter for radio controls.
434 * @ctrl: The control that is filtered.
435 *
436 * This will return true for any controls that are valid for radio device
437 * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM
438 * transmitter class controls.
439 *
440 * This function is to be used with v4l2_ctrl_add_handler().
441 */
442bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
Hans Verkuil09965172010-08-01 14:32:42 -0300443
444/** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
445 * @ncontrols: The number of controls in this cluster.
446 * @controls: The cluster control array of size @ncontrols.
447 */
448void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
449
450
Hans Verkuil72d877c2011-06-10 05:44:36 -0300451/** v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to
452 * that cluster and set it up for autofoo/foo-type handling.
453 * @ncontrols: The number of controls in this cluster.
454 * @controls: The cluster control array of size @ncontrols. The first control
455 * must be the 'auto' control (e.g. autogain, autoexposure, etc.)
456 * @manual_val: The value for the first control in the cluster that equals the
457 * manual setting.
458 * @set_volatile: If true, then all controls except the first auto control will
Hans Verkuil88365102011-08-26 07:35:14 -0300459 * be volatile.
Hans Verkuil72d877c2011-06-10 05:44:36 -0300460 *
461 * Use for control groups where one control selects some automatic feature and
462 * the other controls are only active whenever the automatic feature is turned
463 * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs
464 * red and blue balance, etc.
465 *
466 * The behavior of such controls is as follows:
467 *
468 * When the autofoo control is set to automatic, then any manual controls
469 * are set to inactive and any reads will call g_volatile_ctrl (if the control
470 * was marked volatile).
471 *
472 * When the autofoo control is set to manual, then any manual controls will
473 * be marked active, and any reads will just return the current value without
474 * going through g_volatile_ctrl.
475 *
476 * In addition, this function will set the V4L2_CTRL_FLAG_UPDATE flag
477 * on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s)
478 * if autofoo is in auto mode.
479 */
480void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
481 u8 manual_val, bool set_volatile);
482
483
Hans Verkuil09965172010-08-01 14:32:42 -0300484/** v4l2_ctrl_find() - Find a control with the given ID.
485 * @hdl: The control handler.
486 * @id: The control ID to find.
487 *
488 * If @hdl == NULL this will return NULL as well. Will lock the handler so
489 * do not use from inside &v4l2_ctrl_ops.
490 */
491struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
492
493/** v4l2_ctrl_activate() - Make the control active or inactive.
494 * @ctrl: The control to (de)activate.
495 * @active: True if the control should become active.
496 *
497 * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically.
498 * Does nothing if @ctrl == NULL.
499 * This will usually be called from within the s_ctrl op.
Hans Verkuil6e239392011-06-07 11:13:44 -0300500 * The V4L2_EVENT_CTRL event will be generated afterwards.
Hans Verkuil09965172010-08-01 14:32:42 -0300501 *
Hans Verkuil6e239392011-06-07 11:13:44 -0300502 * This function assumes that the control handler is locked.
Hans Verkuil09965172010-08-01 14:32:42 -0300503 */
504void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
505
506/** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
507 * @ctrl: The control to (de)activate.
508 * @grabbed: True if the control should become grabbed.
509 *
510 * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
511 * Does nothing if @ctrl == NULL.
Hans Verkuil6e239392011-06-07 11:13:44 -0300512 * The V4L2_EVENT_CTRL event will be generated afterwards.
Hans Verkuil09965172010-08-01 14:32:42 -0300513 * This will usually be called when starting or stopping streaming in the
514 * driver.
515 *
Hans Verkuil6e239392011-06-07 11:13:44 -0300516 * This function assumes that the control handler is not locked and will
517 * take the lock itself.
Hans Verkuil09965172010-08-01 14:32:42 -0300518 */
519void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
520
Sylwester Nawrocki2ccbe772013-01-19 15:51:55 -0300521/** v4l2_ctrl_modify_range() - Update the range of a control.
522 * @ctrl: The control to update.
523 * @min: The control's minimum value.
524 * @max: The control's maximum value.
525 * @step: The control's step value
526 * @def: The control's default value.
527 *
528 * Update the range of a control on the fly. This works for control types
529 * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
530 * @step value is interpreted as a menu_skip_mask.
531 *
532 * An error is returned if one of the range arguments is invalid for this
533 * control type.
534 *
535 * This function assumes that the control handler is not locked and will
536 * take the lock itself.
537 */
538int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
539 s32 min, s32 max, u32 step, s32 def);
540
Hans Verkuil09965172010-08-01 14:32:42 -0300541/** v4l2_ctrl_lock() - Helper function to lock the handler
542 * associated with the control.
543 * @ctrl: The control to lock.
544 */
545static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
546{
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300547 mutex_lock(ctrl->handler->lock);
Hans Verkuil09965172010-08-01 14:32:42 -0300548}
549
550/** v4l2_ctrl_lock() - Helper function to unlock the handler
551 * associated with the control.
552 * @ctrl: The control to unlock.
553 */
554static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
555{
Sakari Ailus77e7c4e2012-01-24 21:05:34 -0300556 mutex_unlock(ctrl->handler->lock);
Hans Verkuil09965172010-08-01 14:32:42 -0300557}
558
Hans Verkuil8ac7a942012-09-07 04:46:39 -0300559/** v4l2_ctrl_notify() - Function to set a notify callback for a control.
560 * @ctrl: The control.
561 * @notify: The callback function.
562 * @priv: The callback private handle, passed as argument to the callback.
563 *
564 * This function sets a callback function for the control. If @ctrl is NULL,
565 * then it will do nothing. If @notify is NULL, then the notify callback will
566 * be removed.
567 *
568 * There can be only one notify. If another already exists, then a WARN_ON
569 * will be issued and the function will do nothing.
570 */
571void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv);
572
Hans Verkuil09965172010-08-01 14:32:42 -0300573/** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
574 * @ctrl: The control.
575 *
576 * This returns the control's value safely by going through the control
577 * framework. This function will lock the control's handler, so it cannot be
578 * used from within the &v4l2_ctrl_ops functions.
579 *
580 * This function is for integer type controls only.
581 */
582s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
583
584/** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver.
585 * @ctrl: The control.
586 * @val: The new value.
587 *
588 * This set the control's new value safely by going through the control
589 * framework. This function will lock the control's handler, so it cannot be
590 * used from within the &v4l2_ctrl_ops functions.
591 *
592 * This function is for integer type controls only.
593 */
594int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
595
Laurent Pinchart03d52852012-07-23 09:15:21 -0300596/** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value from within a driver.
597 * @ctrl: The control.
598 *
599 * This returns the control's value safely by going through the control
600 * framework. This function will lock the control's handler, so it cannot be
601 * used from within the &v4l2_ctrl_ops functions.
602 *
603 * This function is for 64-bit integer type controls only.
604 */
605s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
606
607/** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value from within a driver.
608 * @ctrl: The control.
609 * @val: The new value.
610 *
611 * This set the control's new value safely by going through the control
612 * framework. This function will lock the control's handler, so it cannot be
613 * used from within the &v4l2_ctrl_ops functions.
614 *
615 * This function is for 64-bit integer type controls only.
616 */
617int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
618
Hans Verkuilce727572011-06-10 05:56:39 -0300619/* Internal helper functions that deal with control events. */
Hans de Goede3e3661492012-04-08 12:59:47 -0300620extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
621void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);
622void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new);
Hans Verkuil6e239392011-06-07 11:13:44 -0300623
Hans Verkuile2ecb252012-02-02 08:20:53 -0300624/* Can be used as a vidioc_log_status function that just dumps all controls
625 associated with the filehandle. */
626int v4l2_ctrl_log_status(struct file *file, void *fh);
627
Hans Verkuila26243b2012-01-27 16:18:42 -0300628/* Can be used as a vidioc_subscribe_event function that just subscribes
629 control events. */
630int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
Hans Verkuil85f5fe32012-09-04 11:46:09 -0300631 const struct v4l2_event_subscription *sub);
Hans Verkuila26243b2012-01-27 16:18:42 -0300632
633/* Can be used as a poll function that just polls for control events. */
634unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
635
Hans Verkuil09965172010-08-01 14:32:42 -0300636/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
637int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
638int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
639int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
Hans Verkuilab892ba2011-06-07 06:47:18 -0300640int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
641 struct v4l2_control *ctrl);
Hans Verkuil09965172010-08-01 14:32:42 -0300642int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
643int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
Hans Verkuilab892ba2011-06-07 06:47:18 -0300644int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
645 struct v4l2_ext_controls *c);
Hans Verkuil09965172010-08-01 14:32:42 -0300646
647/* Helpers for subdevices. If the associated ctrl_handler == NULL then they
648 will all return -EINVAL. */
649int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
650int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
651int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
652int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
653int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
654int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
655int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
656
Sylwester Nawrocki22fa4272013-01-22 19:00:23 -0300657/* Can be used as a subscribe_event function that just subscribes control
658 events. */
659int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
660 struct v4l2_event_subscription *sub);
661
Sylwester Nawrockiffa9b9f2013-01-22 19:01:02 -0300662/* Log all controls owned by subdev's control handler. */
663int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd);
664
Hans Verkuil09965172010-08-01 14:32:42 -0300665#endif