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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> | |
a19dec6e | 25 | #include <linux/mutex.h> |
01c40c04 | 26 | #include <linux/videodev2.h> |
0996517c HV |
27 | |
28 | /* forward references */ | |
528f0f78 | 29 | struct file; |
0996517c | 30 | struct v4l2_ctrl_handler; |
eb5b16ef | 31 | struct v4l2_ctrl_helper; |
0996517c HV |
32 | struct v4l2_ctrl; |
33 | struct video_device; | |
34 | struct v4l2_subdev; | |
77068d36 | 35 | struct v4l2_subscribed_event; |
6e239399 | 36 | struct v4l2_fh; |
a26243b0 | 37 | struct poll_table_struct; |
0996517c HV |
38 | |
39 | /** struct v4l2_ctrl_ops - The control operations that the driver has to provide. | |
40 | * @g_volatile_ctrl: Get a new value for this control. Generally only relevant | |
41 | * for volatile (and usually read-only) controls such as a control | |
42 | * that returns the current signal strength which changes | |
43 | * continuously. | |
44 | * If not set, then the currently cached value will be returned. | |
45 | * @try_ctrl: Test whether the control's value is valid. Only relevant when | |
46 | * the usual min/max/step checks are not sufficient. | |
47 | * @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The | |
48 | * ctrl->handler->lock is held when these ops are called, so no | |
49 | * one else can access controls owned by that handler. | |
50 | */ | |
51 | struct v4l2_ctrl_ops { | |
52 | int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl); | |
53 | int (*try_ctrl)(struct v4l2_ctrl *ctrl); | |
54 | int (*s_ctrl)(struct v4l2_ctrl *ctrl); | |
55 | }; | |
56 | ||
8ac7a949 HV |
57 | typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv); |
58 | ||
0996517c HV |
59 | /** struct v4l2_ctrl - The control structure. |
60 | * @node: The list node. | |
77068d36 | 61 | * @ev_subs: The list of control event subscriptions. |
0996517c HV |
62 | * @handler: The handler that owns the control. |
63 | * @cluster: Point to start of cluster array. | |
64 | * @ncontrols: Number of controls in cluster array. | |
0996517c | 65 | * @done: Internal flag: set for each processed control. |
2a863793 HV |
66 | * @is_new: Set when the user specified a new value for this control. It |
67 | * is also set when called from v4l2_ctrl_handler_setup. Drivers | |
68 | * should never set this flag. | |
0996517c HV |
69 | * @is_private: If set, then this control is private to its handler and it |
70 | * will not be added to any other handlers. Drivers can set | |
71 | * this flag. | |
72d877ca HV |
72 | * @is_auto: If set, then this control selects whether the other cluster |
73 | * members are in 'automatic' mode or 'manual' mode. This is | |
74 | * used for autogain/gain type clusters. Drivers should never | |
75 | * set this flag directly. | |
d9a25471 HV |
76 | * @is_int: If set, then this control has a simple integer value (i.e. it |
77 | * uses ctrl->val). | |
78 | * @is_string: If set, then this control has type V4L2_CTRL_TYPE_STRING. | |
79 | * @is_ptr: If set, then this control is an array and/or has type >= V4L2_CTRL_COMPOUND_TYPES | |
80 | * and/or has type V4L2_CTRL_TYPE_STRING. In other words, struct | |
81 | * v4l2_ext_control uses field p to point to the data. | |
5626b8c7 HV |
82 | * @has_volatiles: If set, then one or more members of the cluster are volatile. |
83 | * Drivers should never touch this flag. | |
8ac7a949 HV |
84 | * @call_notify: If set, then call the handler's notify function whenever the |
85 | * control's value changes. | |
72d877ca HV |
86 | * @manual_mode_value: If the is_auto flag is set, then this is the value |
87 | * of the auto control that determines if that control is in | |
88 | * manual mode. So if the value of the auto control equals this | |
89 | * value, then the whole cluster is in manual mode. Drivers should | |
90 | * never set this flag directly. | |
0996517c HV |
91 | * @ops: The control ops. |
92 | * @id: The control ID. | |
93 | * @name: The control name. | |
94 | * @type: The control type. | |
95 | * @minimum: The control's minimum value. | |
96 | * @maximum: The control's maximum value. | |
97 | * @default_value: The control's default value. | |
98 | * @step: The control's step value for non-menu controls. | |
d9a25471 | 99 | * @elem_size: The size in bytes of the control. |
0996517c HV |
100 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it |
101 | * easy to skip menu items that are not valid. If bit X is set, | |
102 | * then menu item X is skipped. Of course, this only works for | |
103 | * menus with <= 32 menu items. There are no menus that come | |
104 | * close to that number, so this is OK. Should we ever need more, | |
105 | * then this will have to be extended to a u64 or a bit array. | |
106 | * @qmenu: A const char * array for all menu items. Array entries that are | |
107 | * empty strings ("") correspond to non-existing menu items (this | |
108 | * is in addition to the menu_skip_mask above). The last entry | |
109 | * must be NULL. | |
110 | * @flags: The control's flags. | |
111 | * @cur: The control's current value. | |
112 | * @val: The control's new s32 value. | |
113 | * @val64: The control's new s64 value. | |
0996517c HV |
114 | * @priv: The control's private pointer. For use by the driver. It is |
115 | * untouched by the control framework. Note that this pointer is | |
116 | * not freed when the control is deleted. Should this be needed | |
117 | * then a new internal bitfield can be added to tell the framework | |
118 | * to free this pointer. | |
119 | */ | |
120 | struct v4l2_ctrl { | |
121 | /* Administrative fields */ | |
122 | struct list_head node; | |
77068d36 | 123 | struct list_head ev_subs; |
0996517c HV |
124 | struct v4l2_ctrl_handler *handler; |
125 | struct v4l2_ctrl **cluster; | |
126 | unsigned ncontrols; | |
0996517c HV |
127 | unsigned int done:1; |
128 | ||
2a863793 | 129 | unsigned int is_new:1; |
0996517c | 130 | unsigned int is_private:1; |
72d877ca | 131 | unsigned int is_auto:1; |
d9a25471 HV |
132 | unsigned int is_int:1; |
133 | unsigned int is_string:1; | |
134 | unsigned int is_ptr:1; | |
5626b8c7 | 135 | unsigned int has_volatiles:1; |
8ac7a949 | 136 | unsigned int call_notify:1; |
82a7c049 | 137 | unsigned int manual_mode_value:8; |
0996517c HV |
138 | |
139 | const struct v4l2_ctrl_ops *ops; | |
140 | u32 id; | |
141 | const char *name; | |
142 | enum v4l2_ctrl_type type; | |
0ba2aeb6 | 143 | s64 minimum, maximum, default_value; |
d9a25471 | 144 | u32 elem_size; |
0996517c | 145 | union { |
0ba2aeb6 HV |
146 | u64 step; |
147 | u64 menu_skip_mask; | |
0996517c | 148 | }; |
ce580fe5 SA |
149 | union { |
150 | const char * const *qmenu; | |
151 | const s64 *qmenu_int; | |
152 | }; | |
0996517c | 153 | unsigned long flags; |
d9a25471 | 154 | void *priv; |
0996517c HV |
155 | union { |
156 | s32 val; | |
157 | s64 val64; | |
158 | char *string; | |
d9a25471 HV |
159 | void *p; |
160 | }; | |
0996517c HV |
161 | union { |
162 | s32 val; | |
163 | s64 val64; | |
164 | char *string; | |
d9a25471 HV |
165 | void *p; |
166 | } cur; | |
0996517c HV |
167 | }; |
168 | ||
169 | /** struct v4l2_ctrl_ref - The control reference. | |
170 | * @node: List node for the sorted list. | |
171 | * @next: Single-link list node for the hash. | |
172 | * @ctrl: The actual control information. | |
eb5b16ef | 173 | * @helper: Pointer to helper struct. Used internally in prepare_ext_ctrls(). |
0996517c HV |
174 | * |
175 | * Each control handler has a list of these refs. The list_head is used to | |
176 | * keep a sorted-by-control-ID list of all controls, while the next pointer | |
177 | * is used to link the control in the hash's bucket. | |
178 | */ | |
179 | struct v4l2_ctrl_ref { | |
180 | struct list_head node; | |
181 | struct v4l2_ctrl_ref *next; | |
182 | struct v4l2_ctrl *ctrl; | |
eb5b16ef | 183 | struct v4l2_ctrl_helper *helper; |
0996517c HV |
184 | }; |
185 | ||
186 | /** struct v4l2_ctrl_handler - The control handler keeps track of all the | |
187 | * controls: both the controls owned by the handler and those inherited | |
188 | * from other handlers. | |
77e7c4e6 | 189 | * @_lock: Default for "lock". |
0996517c | 190 | * @lock: Lock to control access to this handler and its controls. |
77e7c4e6 | 191 | * May be replaced by the user right after init. |
0996517c HV |
192 | * @ctrls: The list of controls owned by this handler. |
193 | * @ctrl_refs: The list of control references. | |
194 | * @cached: The last found control reference. It is common that the same | |
195 | * control is needed multiple times, so this is a simple | |
196 | * optimization. | |
197 | * @buckets: Buckets for the hashing. Allows for quick control lookup. | |
8ac7a949 HV |
198 | * @notify: A notify callback that is called whenever the control changes value. |
199 | * Note that the handler's lock is held when the notify function | |
200 | * is called! | |
201 | * @notify_priv: Passed as argument to the v4l2_ctrl notify callback. | |
0996517c HV |
202 | * @nr_of_buckets: Total number of buckets in the array. |
203 | * @error: The error code of the first failed control addition. | |
204 | */ | |
205 | struct v4l2_ctrl_handler { | |
77e7c4e6 SA |
206 | struct mutex _lock; |
207 | struct mutex *lock; | |
0996517c HV |
208 | struct list_head ctrls; |
209 | struct list_head ctrl_refs; | |
210 | struct v4l2_ctrl_ref *cached; | |
211 | struct v4l2_ctrl_ref **buckets; | |
8ac7a949 HV |
212 | v4l2_ctrl_notify_fnc notify; |
213 | void *notify_priv; | |
0996517c HV |
214 | u16 nr_of_buckets; |
215 | int error; | |
216 | }; | |
217 | ||
218 | /** struct v4l2_ctrl_config - Control configuration structure. | |
219 | * @ops: The control ops. | |
220 | * @id: The control ID. | |
221 | * @name: The control name. | |
222 | * @type: The control type. | |
223 | * @min: The control's minimum value. | |
224 | * @max: The control's maximum value. | |
225 | * @step: The control's step value for non-menu controls. | |
226 | * @def: The control's default value. | |
d9a25471 | 227 | * @elem_size: The size in bytes of the control. |
0996517c HV |
228 | * @flags: The control's flags. |
229 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it | |
230 | * easy to skip menu items that are not valid. If bit X is set, | |
231 | * then menu item X is skipped. Of course, this only works for | |
0ba2aeb6 | 232 | * menus with <= 64 menu items. There are no menus that come |
0996517c | 233 | * close to that number, so this is OK. Should we ever need more, |
0ba2aeb6 | 234 | * then this will have to be extended to a bit array. |
0996517c HV |
235 | * @qmenu: A const char * array for all menu items. Array entries that are |
236 | * empty strings ("") correspond to non-existing menu items (this | |
237 | * is in addition to the menu_skip_mask above). The last entry | |
238 | * must be NULL. | |
239 | * @is_private: If set, then this control is private to its handler and it | |
240 | * will not be added to any other handlers. | |
0996517c HV |
241 | */ |
242 | struct v4l2_ctrl_config { | |
243 | const struct v4l2_ctrl_ops *ops; | |
244 | u32 id; | |
245 | const char *name; | |
246 | enum v4l2_ctrl_type type; | |
0ba2aeb6 HV |
247 | s64 min; |
248 | s64 max; | |
249 | u64 step; | |
250 | s64 def; | |
d9a25471 | 251 | u32 elem_size; |
0996517c | 252 | u32 flags; |
0ba2aeb6 | 253 | u64 menu_skip_mask; |
513521ea | 254 | const char * const *qmenu; |
ce580fe5 | 255 | const s64 *qmenu_int; |
0996517c | 256 | unsigned int is_private:1; |
0996517c HV |
257 | }; |
258 | ||
259 | /** v4l2_ctrl_fill() - Fill in the control fields based on the control ID. | |
260 | * | |
261 | * This works for all standard V4L2 controls. | |
262 | * For non-standard controls it will only fill in the given arguments | |
263 | * and @name will be NULL. | |
264 | * | |
265 | * This function will overwrite the contents of @name, @type and @flags. | |
266 | * The contents of @min, @max, @step and @def may be modified depending on | |
267 | * the type. | |
268 | * | |
269 | * Do not use in drivers! It is used internally for backwards compatibility | |
270 | * control handling only. Once all drivers are converted to use the new | |
271 | * control framework this function will no longer be exported. | |
272 | */ | |
273 | void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, | |
0ba2aeb6 | 274 | s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags); |
0996517c HV |
275 | |
276 | ||
6cd247ef | 277 | /** v4l2_ctrl_handler_init_class() - Initialize the control handler. |
0996517c HV |
278 | * @hdl: The control handler. |
279 | * @nr_of_controls_hint: A hint of how many controls this handler is | |
280 | * expected to refer to. This is the total number, so including | |
281 | * any inherited controls. It doesn't have to be precise, but if | |
282 | * it is way off, then you either waste memory (too many buckets | |
283 | * are allocated) or the control lookup becomes slower (not enough | |
284 | * buckets are allocated, so there are more slow list lookups). | |
285 | * It will always work, though. | |
6cd247ef AW |
286 | * @key: Used by the lock validator if CONFIG_LOCKDEP is set. |
287 | * @name: Used by the lock validator if CONFIG_LOCKDEP is set. | |
0996517c HV |
288 | * |
289 | * Returns an error if the buckets could not be allocated. This error will | |
290 | * also be stored in @hdl->error. | |
6cd247ef AW |
291 | * |
292 | * Never use this call directly, always use the v4l2_ctrl_handler_init | |
293 | * macro that hides the @key and @name arguments. | |
0996517c | 294 | */ |
6cd247ef AW |
295 | int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl, |
296 | unsigned nr_of_controls_hint, | |
297 | struct lock_class_key *key, const char *name); | |
298 | ||
299 | #ifdef CONFIG_LOCKDEP | |
300 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ | |
301 | ( \ | |
302 | ({ \ | |
303 | static struct lock_class_key _key; \ | |
304 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \ | |
305 | &_key, \ | |
306 | KBUILD_BASENAME ":" \ | |
307 | __stringify(__LINE__) ":" \ | |
308 | "(" #hdl ")->_lock"); \ | |
309 | }) \ | |
310 | ) | |
311 | #else | |
312 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ | |
313 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL) | |
314 | #endif | |
0996517c HV |
315 | |
316 | /** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free | |
317 | * the control list. | |
318 | * @hdl: The control handler. | |
319 | * | |
320 | * Does nothing if @hdl == NULL. | |
321 | */ | |
322 | void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl); | |
323 | ||
324 | /** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging | |
325 | * to the handler to initialize the hardware to the current control values. | |
326 | * @hdl: The control handler. | |
327 | * | |
328 | * Button controls will be skipped, as are read-only controls. | |
329 | * | |
330 | * If @hdl == NULL, then this just returns 0. | |
331 | */ | |
332 | int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); | |
333 | ||
334 | /** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler. | |
335 | * @hdl: The control handler. | |
336 | * @prefix: The prefix to use when logging the control values. If the | |
337 | * prefix does not end with a space, then ": " will be added | |
338 | * after the prefix. If @prefix == NULL, then no prefix will be | |
339 | * used. | |
340 | * | |
341 | * For use with VIDIOC_LOG_STATUS. | |
342 | * | |
343 | * Does nothing if @hdl == NULL. | |
344 | */ | |
345 | void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl, | |
346 | const char *prefix); | |
347 | ||
348 | /** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2 | |
349 | * control. | |
350 | * @hdl: The control handler. | |
351 | * @cfg: The control's configuration data. | |
352 | * @priv: The control's driver-specific private data. | |
353 | * | |
354 | * If the &v4l2_ctrl struct could not be allocated then NULL is returned | |
355 | * and @hdl->error is set to the error code (if it wasn't set already). | |
356 | */ | |
357 | struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, | |
358 | const struct v4l2_ctrl_config *cfg, void *priv); | |
359 | ||
360 | /** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu control. | |
361 | * @hdl: The control handler. | |
362 | * @ops: The control ops. | |
363 | * @id: The control ID. | |
364 | * @min: The control's minimum value. | |
365 | * @max: The control's maximum value. | |
366 | * @step: The control's step value | |
367 | * @def: The control's default value. | |
368 | * | |
369 | * If the &v4l2_ctrl struct could not be allocated, or the control | |
370 | * ID is not known, then NULL is returned and @hdl->error is set to the | |
371 | * appropriate error code (if it wasn't set already). | |
372 | * | |
373 | * If @id refers to a menu control, then this function will return NULL. | |
374 | * | |
375 | * Use v4l2_ctrl_new_std_menu() when adding menu controls. | |
376 | */ | |
377 | struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, | |
378 | const struct v4l2_ctrl_ops *ops, | |
0ba2aeb6 | 379 | u32 id, s64 min, s64 max, u64 step, s64 def); |
0996517c HV |
380 | |
381 | /** v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 menu control. | |
382 | * @hdl: The control handler. | |
383 | * @ops: The control ops. | |
384 | * @id: The control ID. | |
385 | * @max: The control's maximum value. | |
386 | * @mask: The control's skip mask for menu controls. This makes it | |
387 | * easy to skip menu items that are not valid. If bit X is set, | |
388 | * then menu item X is skipped. Of course, this only works for | |
0ba2aeb6 | 389 | * menus with <= 64 menu items. There are no menus that come |
0996517c | 390 | * close to that number, so this is OK. Should we ever need more, |
0ba2aeb6 | 391 | * then this will have to be extended to a bit array. |
0996517c HV |
392 | * @def: The control's default value. |
393 | * | |
394 | * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value | |
395 | * determines which menu items are to be skipped. | |
396 | * | |
397 | * If @id refers to a non-menu control, then this function will return NULL. | |
398 | */ | |
399 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, | |
400 | const struct v4l2_ctrl_ops *ops, | |
0ba2aeb6 | 401 | u32 id, u8 max, u64 mask, u8 def); |
0996517c | 402 | |
117a711a LP |
403 | /** v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control |
404 | * with driver specific menu. | |
405 | * @hdl: The control handler. | |
406 | * @ops: The control ops. | |
407 | * @id: The control ID. | |
408 | * @max: The control's maximum value. | |
409 | * @mask: The control's skip mask for menu controls. This makes it | |
410 | * easy to skip menu items that are not valid. If bit X is set, | |
411 | * then menu item X is skipped. Of course, this only works for | |
0ba2aeb6 | 412 | * menus with <= 64 menu items. There are no menus that come |
117a711a | 413 | * close to that number, so this is OK. Should we ever need more, |
0ba2aeb6 | 414 | * then this will have to be extended to a bit array. |
117a711a LP |
415 | * @def: The control's default value. |
416 | * @qmenu: The new menu. | |
417 | * | |
418 | * Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific | |
419 | * menu of this control. | |
420 | * | |
421 | */ | |
422 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl, | |
0ba2aeb6 HV |
423 | const struct v4l2_ctrl_ops *ops, u32 id, u8 max, |
424 | u64 mask, u8 def, const char * const *qmenu); | |
117a711a | 425 | |
515f3287 SN |
426 | /** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. |
427 | * @hdl: The control handler. | |
428 | * @ops: The control ops. | |
429 | * @id: The control ID. | |
430 | * @max: The control's maximum value. | |
431 | * @def: The control's default value. | |
432 | * @qmenu_int: The control's menu entries. | |
433 | * | |
434 | * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly | |
435 | * takes as an argument an array of integers determining the menu items. | |
436 | * | |
437 | * If @id refers to a non-integer-menu control, then this function will return NULL. | |
438 | */ | |
439 | struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, | |
440 | const struct v4l2_ctrl_ops *ops, | |
0ba2aeb6 | 441 | u32 id, u8 max, u8 def, const s64 *qmenu_int); |
515f3287 | 442 | |
0996517c HV |
443 | /** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler. |
444 | * @hdl: The control handler. | |
445 | * @ctrl: The control to add. | |
446 | * | |
447 | * It will return NULL if it was unable to add the control reference. | |
448 | * If the control already belonged to the handler, then it will do | |
449 | * nothing and just return @ctrl. | |
450 | */ | |
451 | struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl, | |
452 | struct v4l2_ctrl *ctrl); | |
453 | ||
454 | /** v4l2_ctrl_add_handler() - Add all controls from handler @add to | |
455 | * handler @hdl. | |
456 | * @hdl: The control handler. | |
457 | * @add: The control handler whose controls you want to add to | |
458 | * the @hdl control handler. | |
34a6b7d0 | 459 | * @filter: This function will filter which controls should be added. |
0996517c | 460 | * |
34a6b7d0 HV |
461 | * Does nothing if either of the two handlers is a NULL pointer. |
462 | * If @filter is NULL, then all controls are added. Otherwise only those | |
463 | * controls for which @filter returns true will be added. | |
0996517c HV |
464 | * In case of an error @hdl->error will be set to the error code (if it |
465 | * wasn't set already). | |
466 | */ | |
467 | int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, | |
34a6b7d0 HV |
468 | struct v4l2_ctrl_handler *add, |
469 | bool (*filter)(const struct v4l2_ctrl *ctrl)); | |
0996517c | 470 | |
34a6b7d0 HV |
471 | /** v4l2_ctrl_radio_filter() - Standard filter for radio controls. |
472 | * @ctrl: The control that is filtered. | |
473 | * | |
474 | * This will return true for any controls that are valid for radio device | |
475 | * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM | |
476 | * transmitter class controls. | |
477 | * | |
478 | * This function is to be used with v4l2_ctrl_add_handler(). | |
479 | */ | |
480 | bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl); | |
0996517c HV |
481 | |
482 | /** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster. | |
483 | * @ncontrols: The number of controls in this cluster. | |
484 | * @controls: The cluster control array of size @ncontrols. | |
485 | */ | |
486 | void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls); | |
487 | ||
488 | ||
72d877ca HV |
489 | /** v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging to |
490 | * that cluster and set it up for autofoo/foo-type handling. | |
491 | * @ncontrols: The number of controls in this cluster. | |
492 | * @controls: The cluster control array of size @ncontrols. The first control | |
493 | * must be the 'auto' control (e.g. autogain, autoexposure, etc.) | |
494 | * @manual_val: The value for the first control in the cluster that equals the | |
495 | * manual setting. | |
496 | * @set_volatile: If true, then all controls except the first auto control will | |
88365105 | 497 | * be volatile. |
72d877ca HV |
498 | * |
499 | * Use for control groups where one control selects some automatic feature and | |
500 | * the other controls are only active whenever the automatic feature is turned | |
501 | * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs | |
502 | * red and blue balance, etc. | |
503 | * | |
504 | * The behavior of such controls is as follows: | |
505 | * | |
506 | * When the autofoo control is set to automatic, then any manual controls | |
507 | * are set to inactive and any reads will call g_volatile_ctrl (if the control | |
508 | * was marked volatile). | |
509 | * | |
510 | * When the autofoo control is set to manual, then any manual controls will | |
511 | * be marked active, and any reads will just return the current value without | |
512 | * going through g_volatile_ctrl. | |
513 | * | |
514 | * In addition, this function will set the V4L2_CTRL_FLAG_UPDATE flag | |
515 | * on the autofoo control and V4L2_CTRL_FLAG_INACTIVE on the foo control(s) | |
516 | * if autofoo is in auto mode. | |
517 | */ | |
518 | void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls, | |
519 | u8 manual_val, bool set_volatile); | |
520 | ||
521 | ||
0996517c HV |
522 | /** v4l2_ctrl_find() - Find a control with the given ID. |
523 | * @hdl: The control handler. | |
524 | * @id: The control ID to find. | |
525 | * | |
526 | * If @hdl == NULL this will return NULL as well. Will lock the handler so | |
527 | * do not use from inside &v4l2_ctrl_ops. | |
528 | */ | |
529 | struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); | |
530 | ||
531 | /** v4l2_ctrl_activate() - Make the control active or inactive. | |
532 | * @ctrl: The control to (de)activate. | |
533 | * @active: True if the control should become active. | |
534 | * | |
535 | * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically. | |
536 | * Does nothing if @ctrl == NULL. | |
537 | * This will usually be called from within the s_ctrl op. | |
6e239399 | 538 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
0996517c | 539 | * |
6e239399 | 540 | * This function assumes that the control handler is locked. |
0996517c HV |
541 | */ |
542 | void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active); | |
543 | ||
544 | /** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed. | |
545 | * @ctrl: The control to (de)activate. | |
546 | * @grabbed: True if the control should become grabbed. | |
547 | * | |
548 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. | |
549 | * Does nothing if @ctrl == NULL. | |
6e239399 | 550 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
0996517c HV |
551 | * This will usually be called when starting or stopping streaming in the |
552 | * driver. | |
553 | * | |
6e239399 HV |
554 | * This function assumes that the control handler is not locked and will |
555 | * take the lock itself. | |
0996517c HV |
556 | */ |
557 | void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed); | |
558 | ||
2ccbe779 SN |
559 | /** v4l2_ctrl_modify_range() - Update the range of a control. |
560 | * @ctrl: The control to update. | |
561 | * @min: The control's minimum value. | |
562 | * @max: The control's maximum value. | |
563 | * @step: The control's step value | |
564 | * @def: The control's default value. | |
565 | * | |
566 | * Update the range of a control on the fly. This works for control types | |
567 | * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the | |
568 | * @step value is interpreted as a menu_skip_mask. | |
569 | * | |
570 | * An error is returned if one of the range arguments is invalid for this | |
571 | * control type. | |
572 | * | |
573 | * This function assumes that the control handler is not locked and will | |
574 | * take the lock itself. | |
575 | */ | |
576 | int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, | |
0ba2aeb6 | 577 | s64 min, s64 max, u64 step, s64 def); |
2ccbe779 | 578 | |
0996517c HV |
579 | /** v4l2_ctrl_lock() - Helper function to lock the handler |
580 | * associated with the control. | |
581 | * @ctrl: The control to lock. | |
582 | */ | |
583 | static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) | |
584 | { | |
77e7c4e6 | 585 | mutex_lock(ctrl->handler->lock); |
0996517c HV |
586 | } |
587 | ||
b594a75e | 588 | /** v4l2_ctrl_unlock() - Helper function to unlock the handler |
0996517c HV |
589 | * associated with the control. |
590 | * @ctrl: The control to unlock. | |
591 | */ | |
592 | static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) | |
593 | { | |
77e7c4e6 | 594 | mutex_unlock(ctrl->handler->lock); |
0996517c HV |
595 | } |
596 | ||
8ac7a949 HV |
597 | /** v4l2_ctrl_notify() - Function to set a notify callback for a control. |
598 | * @ctrl: The control. | |
599 | * @notify: The callback function. | |
600 | * @priv: The callback private handle, passed as argument to the callback. | |
601 | * | |
602 | * This function sets a callback function for the control. If @ctrl is NULL, | |
603 | * then it will do nothing. If @notify is NULL, then the notify callback will | |
604 | * be removed. | |
605 | * | |
606 | * There can be only one notify. If another already exists, then a WARN_ON | |
607 | * will be issued and the function will do nothing. | |
608 | */ | |
609 | void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv); | |
610 | ||
0996517c HV |
611 | /** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver. |
612 | * @ctrl: The control. | |
613 | * | |
614 | * This returns the control's value safely by going through the control | |
615 | * framework. This function will lock the control's handler, so it cannot be | |
616 | * used from within the &v4l2_ctrl_ops functions. | |
617 | * | |
618 | * This function is for integer type controls only. | |
619 | */ | |
620 | s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl); | |
621 | ||
622 | /** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver. | |
623 | * @ctrl: The control. | |
624 | * @val: The new value. | |
625 | * | |
626 | * This set the control's new value safely by going through the control | |
627 | * framework. This function will lock the control's handler, so it cannot be | |
628 | * used from within the &v4l2_ctrl_ops functions. | |
629 | * | |
630 | * This function is for integer type controls only. | |
631 | */ | |
632 | int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val); | |
633 | ||
03d5285b LP |
634 | /** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value from within a driver. |
635 | * @ctrl: The control. | |
636 | * | |
637 | * This returns the control's value safely by going through the control | |
638 | * framework. This function will lock the control's handler, so it cannot be | |
639 | * used from within the &v4l2_ctrl_ops functions. | |
640 | * | |
641 | * This function is for 64-bit integer type controls only. | |
642 | */ | |
643 | s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl); | |
644 | ||
645 | /** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value from within a driver. | |
646 | * @ctrl: The control. | |
647 | * @val: The new value. | |
648 | * | |
649 | * This set the control's new value safely by going through the control | |
650 | * framework. This function will lock the control's handler, so it cannot be | |
651 | * used from within the &v4l2_ctrl_ops functions. | |
652 | * | |
653 | * This function is for 64-bit integer type controls only. | |
654 | */ | |
655 | int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val); | |
656 | ||
ce727574 | 657 | /* Internal helper functions that deal with control events. */ |
3e366149 HG |
658 | extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops; |
659 | void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new); | |
660 | void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new); | |
6e239399 | 661 | |
e2ecb257 HV |
662 | /* Can be used as a vidioc_log_status function that just dumps all controls |
663 | associated with the filehandle. */ | |
664 | int v4l2_ctrl_log_status(struct file *file, void *fh); | |
665 | ||
a26243b0 HV |
666 | /* Can be used as a vidioc_subscribe_event function that just subscribes |
667 | control events. */ | |
668 | int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh, | |
85f5fe39 | 669 | const struct v4l2_event_subscription *sub); |
a26243b0 HV |
670 | |
671 | /* Can be used as a poll function that just polls for control events. */ | |
672 | unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait); | |
673 | ||
0996517c HV |
674 | /* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */ |
675 | int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc); | |
d9a25471 | 676 | int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc); |
0996517c HV |
677 | int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm); |
678 | int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl); | |
ab892bac HV |
679 | int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
680 | struct v4l2_control *ctrl); | |
0996517c HV |
681 | int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c); |
682 | int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c); | |
ab892bac HV |
683 | int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
684 | struct v4l2_ext_controls *c); | |
0996517c HV |
685 | |
686 | /* Helpers for subdevices. If the associated ctrl_handler == NULL then they | |
687 | will all return -EINVAL. */ | |
688 | int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); | |
689 | int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); | |
690 | int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
691 | int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
692 | int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs); | |
693 | int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
694 | int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl); | |
695 | ||
22fa4279 SN |
696 | /* Can be used as a subscribe_event function that just subscribes control |
697 | events. */ | |
698 | int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, | |
699 | struct v4l2_event_subscription *sub); | |
700 | ||
ffa9b9f0 SN |
701 | /* Log all controls owned by subdev's control handler. */ |
702 | int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd); | |
703 | ||
0996517c | 704 | #endif |