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0996517c HV |
1 | /* |
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> | |
01c40c04 | 25 | #include <linux/videodev2.h> |
0996517c HV |
26 | |
27 | /* forward references */ | |
528f0f78 | 28 | struct file; |
0996517c | 29 | struct v4l2_ctrl_handler; |
eb5b16ef | 30 | struct v4l2_ctrl_helper; |
0996517c HV |
31 | struct v4l2_ctrl; |
32 | struct video_device; | |
33 | struct v4l2_subdev; | |
77068d36 | 34 | struct v4l2_subscribed_event; |
6e239399 | 35 | struct v4l2_fh; |
a26243b0 | 36 | struct poll_table_struct; |
0996517c HV |
37 | |
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 | */ | |
50 | struct 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 | ||
56 | /** struct v4l2_ctrl - The control structure. | |
57 | * @node: The list node. | |
77068d36 | 58 | * @ev_subs: The list of control event subscriptions. |
0996517c HV |
59 | * @handler: The handler that owns the control. |
60 | * @cluster: Point to start of cluster array. | |
61 | * @ncontrols: Number of controls in cluster array. | |
0996517c | 62 | * @done: Internal flag: set for each processed control. |
2a863793 HV |
63 | * @is_new: Set when the user specified a new value for this control. It |
64 | * is also set when called from v4l2_ctrl_handler_setup. Drivers | |
65 | * should never set this flag. | |
0996517c HV |
66 | * @is_private: If set, then this control is private to its handler and it |
67 | * will not be added to any other handlers. Drivers can set | |
68 | * this flag. | |
72d877ca HV |
69 | * @is_auto: If set, then this control selects whether the other cluster |
70 | * members are in 'automatic' mode or 'manual' mode. This is | |
71 | * used for autogain/gain type clusters. Drivers should never | |
72 | * set this flag directly. | |
5626b8c7 HV |
73 | * @has_volatiles: If set, then one or more members of the cluster are volatile. |
74 | * Drivers should never touch this flag. | |
72d877ca HV |
75 | * @manual_mode_value: If the is_auto flag is set, then this is the value |
76 | * of the auto control that determines if that control is in | |
77 | * manual mode. So if the value of the auto control equals this | |
78 | * value, then the whole cluster is in manual mode. Drivers should | |
79 | * never set this flag directly. | |
0996517c HV |
80 | * @ops: The control ops. |
81 | * @id: The control ID. | |
82 | * @name: The control name. | |
83 | * @type: The control type. | |
84 | * @minimum: The control's minimum value. | |
85 | * @maximum: The control's maximum value. | |
86 | * @default_value: The control's default value. | |
87 | * @step: The control's step value for non-menu controls. | |
88 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it | |
89 | * easy to skip menu items that are not valid. If bit X is set, | |
90 | * then menu item X is skipped. Of course, this only works for | |
91 | * menus with <= 32 menu items. There are no menus that come | |
92 | * close to that number, so this is OK. Should we ever need more, | |
93 | * then this will have to be extended to a u64 or a bit array. | |
94 | * @qmenu: A const char * array for all menu items. Array entries that are | |
95 | * empty strings ("") correspond to non-existing menu items (this | |
96 | * is in addition to the menu_skip_mask above). The last entry | |
97 | * must be NULL. | |
98 | * @flags: The control's flags. | |
99 | * @cur: The control's current value. | |
100 | * @val: The control's new s32 value. | |
101 | * @val64: The control's new s64 value. | |
102 | * @string: The control's new string value. | |
103 | * @priv: The control's private pointer. For use by the driver. It is | |
104 | * untouched by the control framework. Note that this pointer is | |
105 | * not freed when the control is deleted. Should this be needed | |
106 | * then a new internal bitfield can be added to tell the framework | |
107 | * to free this pointer. | |
108 | */ | |
109 | struct v4l2_ctrl { | |
110 | /* Administrative fields */ | |
111 | struct list_head node; | |
77068d36 | 112 | struct list_head ev_subs; |
0996517c HV |
113 | struct v4l2_ctrl_handler *handler; |
114 | struct v4l2_ctrl **cluster; | |
115 | unsigned ncontrols; | |
0996517c HV |
116 | unsigned int done:1; |
117 | ||
2a863793 | 118 | unsigned int is_new:1; |
0996517c | 119 | unsigned int is_private:1; |
72d877ca | 120 | unsigned int is_auto:1; |
5626b8c7 | 121 | unsigned int has_volatiles:1; |
82a7c049 | 122 | unsigned int manual_mode_value:8; |
0996517c HV |
123 | |
124 | const struct v4l2_ctrl_ops *ops; | |
125 | u32 id; | |
126 | const char *name; | |
127 | enum v4l2_ctrl_type type; | |
128 | s32 minimum, maximum, default_value; | |
129 | union { | |
130 | u32 step; | |
131 | u32 menu_skip_mask; | |
132 | }; | |
ce580fe5 SA |
133 | union { |
134 | const char * const *qmenu; | |
135 | const s64 *qmenu_int; | |
136 | }; | |
0996517c HV |
137 | unsigned long flags; |
138 | union { | |
139 | s32 val; | |
140 | s64 val64; | |
141 | char *string; | |
142 | } cur; | |
143 | union { | |
144 | s32 val; | |
145 | s64 val64; | |
146 | char *string; | |
147 | }; | |
148 | void *priv; | |
149 | }; | |
150 | ||
151 | /** struct v4l2_ctrl_ref - The control reference. | |
152 | * @node: List node for the sorted list. | |
153 | * @next: Single-link list node for the hash. | |
154 | * @ctrl: The actual control information. | |
eb5b16ef | 155 | * @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls(). |
0996517c HV |
156 | * |
157 | * Each control handler has a list of these refs. The list_head is used to | |
158 | * keep a sorted-by-control-ID list of all controls, while the next pointer | |
159 | * is used to link the control in the hash's bucket. | |
160 | */ | |
161 | struct v4l2_ctrl_ref { | |
162 | struct list_head node; | |
163 | struct v4l2_ctrl_ref *next; | |
164 | struct v4l2_ctrl *ctrl; | |
eb5b16ef | 165 | struct v4l2_ctrl_helper *helper; |
0996517c HV |
166 | }; |
167 | ||
168 | /** struct v4l2_ctrl_handler - The control handler keeps track of all the | |
169 | * controls: both the controls owned by the handler and those inherited | |
170 | * from other handlers. | |
77e7c4e6 | 171 | * @_lock: Default for "lock". |
0996517c | 172 | * @lock: Lock to control access to this handler and its controls. |
77e7c4e6 | 173 | * May be replaced by the user right after init. |
0996517c HV |
174 | * @ctrls: The list of controls owned by this handler. |
175 | * @ctrl_refs: The list of control references. | |
176 | * @cached: The last found control reference. It is common that the same | |
177 | * control is needed multiple times, so this is a simple | |
178 | * optimization. | |
179 | * @buckets: Buckets for the hashing. Allows for quick control lookup. | |
180 | * @nr_of_buckets: Total number of buckets in the array. | |
181 | * @error: The error code of the first failed control addition. | |
182 | */ | |
183 | struct v4l2_ctrl_handler { | |
77e7c4e6 SA |
184 | struct mutex _lock; |
185 | struct mutex *lock; | |
0996517c HV |
186 | struct list_head ctrls; |
187 | struct list_head ctrl_refs; | |
188 | struct v4l2_ctrl_ref *cached; | |
189 | struct v4l2_ctrl_ref **buckets; | |
190 | u16 nr_of_buckets; | |
191 | int error; | |
192 | }; | |
193 | ||
194 | /** struct v4l2_ctrl_config - Control configuration structure. | |
195 | * @ops: The control ops. | |
196 | * @id: The control ID. | |
197 | * @name: The control name. | |
198 | * @type: The control type. | |
199 | * @min: The control's minimum value. | |
200 | * @max: The control's maximum value. | |
201 | * @step: The control's step value for non-menu controls. | |
202 | * @def: The control's default value. | |
203 | * @flags: The control's flags. | |
204 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it | |
205 | * easy to skip menu items that are not valid. If bit X is set, | |
206 | * then menu item X is skipped. Of course, this only works for | |
207 | * menus with <= 32 menu items. There are no menus that come | |
208 | * close to that number, so this is OK. Should we ever need more, | |
209 | * then this will have to be extended to a u64 or a bit array. | |
210 | * @qmenu: A const char * array for all menu items. Array entries that are | |
211 | * empty strings ("") correspond to non-existing menu items (this | |
212 | * is in addition to the menu_skip_mask above). The last entry | |
213 | * must be NULL. | |
214 | * @is_private: If set, then this control is private to its handler and it | |
215 | * will not be added to any other handlers. | |
0996517c HV |
216 | */ |
217 | struct v4l2_ctrl_config { | |
218 | const struct v4l2_ctrl_ops *ops; | |
219 | u32 id; | |
220 | const char *name; | |
221 | enum v4l2_ctrl_type type; | |
222 | s32 min; | |
223 | s32 max; | |
224 | u32 step; | |
225 | s32 def; | |
226 | u32 flags; | |
227 | u32 menu_skip_mask; | |
513521ea | 228 | const char * const *qmenu; |
ce580fe5 | 229 | const s64 *qmenu_int; |
0996517c | 230 | unsigned int is_private:1; |
0996517c HV |
231 | }; |
232 | ||
233 | /** v4l2_ctrl_fill() - Fill in the control fields based on the control ID. | |
234 | * | |
235 | * This works for all standard V4L2 controls. | |
236 | * For non-standard controls it will only fill in the given arguments | |
237 | * and @name will be NULL. | |
238 | * | |
239 | * This function will overwrite the contents of @name, @type and @flags. | |
240 | * The contents of @min, @max, @step and @def may be modified depending on | |
241 | * the type. | |
242 | * | |
243 | * Do not use in drivers! It is used internally for backwards compatibility | |
244 | * control handling only. Once all drivers are converted to use the new | |
245 | * control framework this function will no longer be exported. | |
246 | */ | |
247 | void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, | |
248 | s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags); | |
249 | ||
250 | ||
251 | /** v4l2_ctrl_handler_init() - Initialize the control handler. | |
252 | * @hdl: The control handler. | |
253 | * @nr_of_controls_hint: A hint of how many controls this handler is | |
254 | * expected to refer to. This is the total number, so including | |
255 | * any inherited controls. It doesn't have to be precise, but if | |
256 | * it is way off, then you either waste memory (too many buckets | |
257 | * are allocated) or the control lookup becomes slower (not enough | |
258 | * buckets are allocated, so there are more slow list lookups). | |
259 | * It will always work, though. | |
260 | * | |
261 | * Returns an error if the buckets could not be allocated. This error will | |
262 | * also be stored in @hdl->error. | |
263 | */ | |
264 | int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl, | |
265 | unsigned nr_of_controls_hint); | |
266 | ||
267 | /** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free | |
268 | * the control list. | |
269 | * @hdl: The control handler. | |
270 | * | |
271 | * Does nothing if @hdl == NULL. | |
272 | */ | |
273 | void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl); | |
274 | ||
275 | /** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging | |
276 | * to the handler to initialize the hardware to the current control values. | |
277 | * @hdl: The control handler. | |
278 | * | |
279 | * Button controls will be skipped, as are read-only controls. | |
280 | * | |
281 | * If @hdl == NULL, then this just returns 0. | |
282 | */ | |
283 | int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); | |
284 | ||
285 | /** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler. | |
286 | * @hdl: The control handler. | |
287 | * @prefix: The prefix to use when logging the control values. If the | |
288 | * prefix does not end with a space, then ": " will be added | |
289 | * after the prefix. If @prefix == NULL, then no prefix will be | |
290 | * used. | |
291 | * | |
292 | * For use with VIDIOC_LOG_STATUS. | |
293 | * | |
294 | * Does nothing if @hdl == NULL. | |
295 | */ | |
296 | void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl, | |
297 | const char *prefix); | |
298 | ||
299 | /** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2 | |
300 | * control. | |
301 | * @hdl: The control handler. | |
302 | * @cfg: The control's configuration data. | |
303 | * @priv: The control's driver-specific private data. | |
304 | * | |
305 | * If the &v4l2_ctrl struct could not be allocated then NULL is returned | |
306 | * and @hdl->error is set to the error code (if it wasn't set already). | |
307 | */ | |
308 | struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, | |
309 | const struct v4l2_ctrl_config *cfg, void *priv); | |
310 | ||
311 | /** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control. | |
312 | * @hdl: The control handler. | |
313 | * @ops: The control ops. | |
314 | * @id: The control ID. | |
315 | * @min: The control's minimum value. | |
316 | * @max: The control's maximum value. | |
317 | * @step: The control's step value | |
318 | * @def: The control's default value. | |
319 | * | |
320 | * If the &v4l2_ctrl struct could not be allocated, or the control | |
321 | * ID is not known, then NULL is returned and @hdl->error is set to the | |
322 | * appropriate error code (if it wasn't set already). | |
323 | * | |
324 | * If @id refers to a menu control, then this function will return NULL. | |
325 | * | |
326 | * Use v4l2_ctrl_new_std_menu() when adding menu controls. | |
327 | */ | |
328 | struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, | |
329 | const struct v4l2_ctrl_ops *ops, | |
330 | u32 id, s32 min, s32 max, u32 step, s32 def); | |
331 | ||
332 | /** v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control. | |
333 | * @hdl: The control handler. | |
334 | * @ops: The control ops. | |
335 | * @id: The control ID. | |
336 | * @max: The control's maximum value. | |
337 | * @mask: The control's skip mask for menu controls. This makes it | |
338 | * easy to skip menu items that are not valid. If bit X is set, | |
339 | * then menu item X is skipped. Of course, this only works for | |
340 | * menus with <= 32 menu items. There are no menus that come | |
341 | * close to that number, so this is OK. Should we ever need more, | |
342 | * then this will have to be extended to a u64 or a bit array. | |
343 | * @def: The control's default value. | |
344 | * | |
345 | * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value | |
346 | * determines which menu items are to be skipped. | |
347 | * | |
348 | * If @id refers to a non-menu control, then this function will return NULL. | |
349 | */ | |
350 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, | |
351 | const struct v4l2_ctrl_ops *ops, | |
352 | u32 id, s32 max, s32 mask, s32 def); | |
353 | ||
515f3287 SN |
354 | /** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. |
355 | * @hdl: The control handler. | |
356 | * @ops: The control ops. | |
357 | * @id: The control ID. | |
358 | * @max: The control's maximum value. | |
359 | * @def: The control's default value. | |
360 | * @qmenu_int: The control's menu entries. | |
361 | * | |
362 | * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly | |
363 | * takes as an argument an array of integers determining the menu items. | |
364 | * | |
365 | * If @id refers to a non-integer-menu control, then this function will return NULL. | |
366 | */ | |
367 | struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, | |
368 | const struct v4l2_ctrl_ops *ops, | |
369 | u32 id, s32 max, s32 def, const s64 *qmenu_int); | |
370 | ||
0996517c HV |
371 | /** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler. |
372 | * @hdl: The control handler. | |
373 | * @ctrl: The control to add. | |
374 | * | |
375 | * It will return NULL if it was unable to add the control reference. | |
376 | * If the control already belonged to the handler, then it will do | |
377 | * nothing and just return @ctrl. | |
378 | */ | |
379 | struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl, | |
380 | struct v4l2_ctrl *ctrl); | |
381 | ||
382 | /** v4l2_ctrl_add_handler() - Add all controls from handler @add to | |
383 | * handler @hdl. | |
384 | * @hdl: The control handler. | |
385 | * @add: The control handler whose controls you want to add to | |
386 | * the @hdl control handler. | |
387 | * | |
388 | * Does nothing if either of the two is a NULL pointer. | |
389 | * In case of an error @hdl->error will be set to the error code (if it | |
390 | * wasn't set already). | |
391 | */ | |
392 | int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, | |
393 | struct v4l2_ctrl_handler *add); | |
394 | ||
395 | ||
396 | /** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster. | |
397 | * @ncontrols: The number of controls in this cluster. | |
398 | * @controls: The cluster control array of size @ncontrols. | |
399 | */ | |
400 | void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls); | |
401 | ||
402 | ||
72d877ca HV |
403 | /** v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to |
404 | * that cluster and set it up for autofoo/foo-type handling. | |
405 | * @ncontrols: The number of controls in this cluster. | |
406 | * @controls: The cluster control array of size @ncontrols. The first control | |
407 | * must be the 'auto' control (e.g. autogain, autoexposure, etc.) | |
408 | * @manual_val: The value for the first control in the cluster that equals the | |
409 | * manual setting. | |
410 | * @set_volatile: If true, then all controls except the first auto control will | |
88365105 | 411 | * be volatile. |
72d877ca HV |
412 | * |
413 | * Use for control groups where one control selects some automatic feature and | |
414 | * the other controls are only active whenever the automatic feature is turned | |
415 | * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs | |
416 | * red and blue balance, etc. | |
417 | * | |
418 | * The behavior of such controls is as follows: | |
419 | * | |
420 | * When the autofoo control is set to automatic, then any manual controls | |
421 | * are set to inactive and any reads will call g_volatile_ctrl (if the control | |
422 | * was marked volatile). | |
423 | * | |
424 | * When the autofoo control is set to manual, then any manual controls will | |
425 | * be marked active, and any reads will just return the current value without | |
426 | * going through g_volatile_ctrl. | |
427 | * | |
428 | * In addition, this function will set the V4L2_CTRL_FLAG_UPDATE flag | |
429 | * on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s) | |
430 | * if autofoo is in auto mode. | |
431 | */ | |
432 | void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls, | |
433 | u8 manual_val, bool set_volatile); | |
434 | ||
435 | ||
0996517c HV |
436 | /** v4l2_ctrl_find() - Find a control with the given ID. |
437 | * @hdl: The control handler. | |
438 | * @id: The control ID to find. | |
439 | * | |
440 | * If @hdl == NULL this will return NULL as well. Will lock the handler so | |
441 | * do not use from inside &v4l2_ctrl_ops. | |
442 | */ | |
443 | struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); | |
444 | ||
445 | /** v4l2_ctrl_activate() - Make the control active or inactive. | |
446 | * @ctrl: The control to (de)activate. | |
447 | * @active: True if the control should become active. | |
448 | * | |
449 | * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically. | |
450 | * Does nothing if @ctrl == NULL. | |
451 | * This will usually be called from within the s_ctrl op. | |
6e239399 | 452 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
0996517c | 453 | * |
6e239399 | 454 | * This function assumes that the control handler is locked. |
0996517c HV |
455 | */ |
456 | void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active); | |
457 | ||
458 | /** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed. | |
459 | * @ctrl: The control to (de)activate. | |
460 | * @grabbed: True if the control should become grabbed. | |
461 | * | |
462 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. | |
463 | * Does nothing if @ctrl == NULL. | |
6e239399 | 464 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
0996517c HV |
465 | * This will usually be called when starting or stopping streaming in the |
466 | * driver. | |
467 | * | |
6e239399 HV |
468 | * This function assumes that the control handler is not locked and will |
469 | * take the lock itself. | |
0996517c HV |
470 | */ |
471 | void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed); | |
472 | ||
473 | /** v4l2_ctrl_lock() - Helper function to lock the handler | |
474 | * associated with the control. | |
475 | * @ctrl: The control to lock. | |
476 | */ | |
477 | static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) | |
478 | { | |
77e7c4e6 | 479 | mutex_lock(ctrl->handler->lock); |
0996517c HV |
480 | } |
481 | ||
482 | /** v4l2_ctrl_lock() - Helper function to unlock the handler | |
483 | * associated with the control. | |
484 | * @ctrl: The control to unlock. | |
485 | */ | |
486 | static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) | |
487 | { | |
77e7c4e6 | 488 | mutex_unlock(ctrl->handler->lock); |
0996517c HV |
489 | } |
490 | ||
491 | /** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver. | |
492 | * @ctrl: The control. | |
493 | * | |
494 | * This returns the control's value safely by going through the control | |
495 | * framework. This function will lock the control's handler, so it cannot be | |
496 | * used from within the &v4l2_ctrl_ops functions. | |
497 | * | |
498 | * This function is for integer type controls only. | |
499 | */ | |
500 | s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl); | |
501 | ||
502 | /** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver. | |
503 | * @ctrl: The control. | |
504 | * @val: The new value. | |
505 | * | |
506 | * This set the control's new value safely by going through the control | |
507 | * framework. This function will lock the control's handler, so it cannot be | |
508 | * used from within the &v4l2_ctrl_ops functions. | |
509 | * | |
510 | * This function is for integer type controls only. | |
511 | */ | |
512 | int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val); | |
513 | ||
ce727574 | 514 | /* Internal helper functions that deal with control events. */ |
3e366149 HG |
515 | extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops; |
516 | void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new); | |
517 | void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new); | |
6e239399 | 518 | |
e2ecb257 HV |
519 | /* Can be used as a vidioc_log_status function that just dumps all controls |
520 | associated with the filehandle. */ | |
521 | int v4l2_ctrl_log_status(struct file *file, void *fh); | |
522 | ||
a26243b0 HV |
523 | /* Can be used as a vidioc_subscribe_event function that just subscribes |
524 | control events. */ | |
525 | int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh, | |
526 | struct v4l2_event_subscription *sub); | |
527 | ||
528 | /* Can be used as a poll function that just polls for control events. */ | |
529 | unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait); | |
530 | ||
0996517c HV |
531 | /* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */ |
532 | int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc); | |
533 | int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm); | |
534 | int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl); | |
ab892bac HV |
535 | int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
536 | struct v4l2_control *ctrl); | |
0996517c HV |
537 | int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c); |
538 | int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c); | |
ab892bac HV |
539 | int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
540 | struct v4l2_ext_controls *c); | |
0996517c HV |
541 | |
542 | /* Helpers for subdevices. If the associated ctrl_handler == NULL then they | |
543 | will all return -EINVAL. */ | |
544 | int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); | |
545 | int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); | |
546 | int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
547 | int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
548 | int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
549 | int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
550 | int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
551 | ||
552 | #endif |