1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * V4L2 controls support header. |
4 | * |
5 | * Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl> |
6 | */ |
7 | |
8 | #ifndef _V4L2_CTRLS_H |
9 | #define _V4L2_CTRLS_H |
10 | |
11 | #include <linux/list.h> |
12 | #include <linux/mutex.h> |
13 | #include <linux/videodev2.h> |
14 | #include <media/media-request.h> |
15 | |
16 | /* forward references */ |
17 | struct file; |
18 | struct poll_table_struct; |
19 | struct v4l2_ctrl; |
20 | struct v4l2_ctrl_handler; |
21 | struct v4l2_ctrl_helper; |
22 | struct v4l2_fh; |
23 | struct v4l2_fwnode_device_properties; |
24 | struct v4l2_subdev; |
25 | struct v4l2_subscribed_event; |
26 | struct video_device; |
27 | |
28 | /** |
29 | * union v4l2_ctrl_ptr - A pointer to a control value. |
30 | * @p_s32: Pointer to a 32-bit signed value. |
31 | * @p_s64: Pointer to a 64-bit signed value. |
32 | * @p_u8: Pointer to a 8-bit unsigned value. |
33 | * @p_u16: Pointer to a 16-bit unsigned value. |
34 | * @p_u32: Pointer to a 32-bit unsigned value. |
35 | * @p_char: Pointer to a string. |
36 | * @p_mpeg2_sequence: Pointer to a MPEG2 sequence structure. |
37 | * @p_mpeg2_picture: Pointer to a MPEG2 picture structure. |
38 | * @p_mpeg2_quantisation: Pointer to a MPEG2 quantisation data structure. |
39 | * @p_fwht_params: Pointer to a FWHT stateless parameters structure. |
40 | * @p_h264_sps: Pointer to a struct v4l2_ctrl_h264_sps. |
41 | * @p_h264_pps: Pointer to a struct v4l2_ctrl_h264_pps. |
42 | * @p_h264_scaling_matrix: Pointer to a struct v4l2_ctrl_h264_scaling_matrix. |
43 | * @p_h264_slice_params: Pointer to a struct v4l2_ctrl_h264_slice_params. |
44 | * @p_h264_decode_params: Pointer to a struct v4l2_ctrl_h264_decode_params. |
45 | * @p_h264_pred_weights: Pointer to a struct v4l2_ctrl_h264_pred_weights. |
46 | * @p_vp8_frame: Pointer to a VP8 frame params structure. |
47 | * @p_vp9_compressed_hdr_probs: Pointer to a VP9 frame compressed header probs structure. |
48 | * @p_vp9_frame: Pointer to a VP9 frame params structure. |
49 | * @p_hevc_sps: Pointer to an HEVC sequence parameter set structure. |
50 | * @p_hevc_pps: Pointer to an HEVC picture parameter set structure. |
51 | * @p_hevc_slice_params: Pointer to an HEVC slice parameters structure. |
52 | * @p_hdr10_cll: Pointer to an HDR10 Content Light Level structure. |
53 | * @p_hdr10_mastering: Pointer to an HDR10 Mastering Display structure. |
54 | * @p_area: Pointer to an area. |
55 | * @p_av1_sequence: Pointer to an AV1 sequence structure. |
56 | * @p_av1_tile_group_entry: Pointer to an AV1 tile group entry structure. |
57 | * @p_av1_frame: Pointer to an AV1 frame structure. |
58 | * @p_av1_film_grain: Pointer to an AV1 film grain structure. |
59 | * @p: Pointer to a compound value. |
60 | * @p_const: Pointer to a constant compound value. |
61 | */ |
62 | union v4l2_ctrl_ptr { |
63 | s32 *p_s32; |
64 | s64 *p_s64; |
65 | u8 *p_u8; |
66 | u16 *p_u16; |
67 | u32 *p_u32; |
68 | char *p_char; |
69 | struct v4l2_ctrl_mpeg2_sequence *p_mpeg2_sequence; |
70 | struct v4l2_ctrl_mpeg2_picture *p_mpeg2_picture; |
71 | struct v4l2_ctrl_mpeg2_quantisation *p_mpeg2_quantisation; |
72 | struct v4l2_ctrl_fwht_params *p_fwht_params; |
73 | struct v4l2_ctrl_h264_sps *p_h264_sps; |
74 | struct v4l2_ctrl_h264_pps *p_h264_pps; |
75 | struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix; |
76 | struct v4l2_ctrl_h264_slice_params *p_h264_slice_params; |
77 | struct v4l2_ctrl_h264_decode_params *p_h264_decode_params; |
78 | struct v4l2_ctrl_h264_pred_weights *p_h264_pred_weights; |
79 | struct v4l2_ctrl_vp8_frame *p_vp8_frame; |
80 | struct v4l2_ctrl_hevc_sps *p_hevc_sps; |
81 | struct v4l2_ctrl_hevc_pps *p_hevc_pps; |
82 | struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params; |
83 | struct v4l2_ctrl_vp9_compressed_hdr *p_vp9_compressed_hdr_probs; |
84 | struct v4l2_ctrl_vp9_frame *p_vp9_frame; |
85 | struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll; |
86 | struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering; |
87 | struct v4l2_area *p_area; |
88 | struct v4l2_ctrl_av1_sequence *p_av1_sequence; |
89 | struct v4l2_ctrl_av1_tile_group_entry *p_av1_tile_group_entry; |
90 | struct v4l2_ctrl_av1_frame *p_av1_frame; |
91 | struct v4l2_ctrl_av1_film_grain *p_av1_film_grain; |
92 | void *p; |
93 | const void *p_const; |
94 | }; |
95 | |
96 | /** |
97 | * v4l2_ctrl_ptr_create() - Helper function to return a v4l2_ctrl_ptr from a |
98 | * void pointer |
99 | * @ptr: The void pointer |
100 | */ |
101 | static inline union v4l2_ctrl_ptr v4l2_ctrl_ptr_create(void *ptr) |
102 | { |
103 | union v4l2_ctrl_ptr p = { .p = ptr }; |
104 | |
105 | return p; |
106 | } |
107 | |
108 | /** |
109 | * struct v4l2_ctrl_ops - The control operations that the driver has to provide. |
110 | * |
111 | * @g_volatile_ctrl: Get a new value for this control. Generally only relevant |
112 | * for volatile (and usually read-only) controls such as a control |
113 | * that returns the current signal strength which changes |
114 | * continuously. |
115 | * If not set, then the currently cached value will be returned. |
116 | * @try_ctrl: Test whether the control's value is valid. Only relevant when |
117 | * the usual min/max/step checks are not sufficient. |
118 | * @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The |
119 | * ctrl->handler->lock is held when these ops are called, so no |
120 | * one else can access controls owned by that handler. |
121 | */ |
122 | struct v4l2_ctrl_ops { |
123 | int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl); |
124 | int (*try_ctrl)(struct v4l2_ctrl *ctrl); |
125 | int (*s_ctrl)(struct v4l2_ctrl *ctrl); |
126 | }; |
127 | |
128 | /** |
129 | * struct v4l2_ctrl_type_ops - The control type operations that the driver |
130 | * has to provide. |
131 | * |
132 | * @equal: return true if all ctrl->elems array elements are equal. |
133 | * @init: initialize the value for array elements from from_idx to ctrl->elems. |
134 | * @log: log the value. |
135 | * @validate: validate the value for ctrl->new_elems array elements. |
136 | * Return 0 on success and a negative value otherwise. |
137 | */ |
138 | struct v4l2_ctrl_type_ops { |
139 | bool (*equal)(const struct v4l2_ctrl *ctrl, |
140 | union v4l2_ctrl_ptr ptr1, union v4l2_ctrl_ptr ptr2); |
141 | void (*init)(const struct v4l2_ctrl *ctrl, u32 from_idx, |
142 | union v4l2_ctrl_ptr ptr); |
143 | void (*log)(const struct v4l2_ctrl *ctrl); |
144 | int (*validate)(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr ptr); |
145 | }; |
146 | |
147 | /** |
148 | * typedef v4l2_ctrl_notify_fnc - typedef for a notify argument with a function |
149 | * that should be called when a control value has changed. |
150 | * |
151 | * @ctrl: pointer to struct &v4l2_ctrl |
152 | * @priv: control private data |
153 | * |
154 | * This typedef definition is used as an argument to v4l2_ctrl_notify() |
155 | * and as an argument at struct &v4l2_ctrl_handler. |
156 | */ |
157 | typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv); |
158 | |
159 | /** |
160 | * struct v4l2_ctrl - The control structure. |
161 | * |
162 | * @node: The list node. |
163 | * @ev_subs: The list of control event subscriptions. |
164 | * @handler: The handler that owns the control. |
165 | * @cluster: Point to start of cluster array. |
166 | * @ncontrols: Number of controls in cluster array. |
167 | * @done: Internal flag: set for each processed control. |
168 | * @is_new: Set when the user specified a new value for this control. It |
169 | * is also set when called from v4l2_ctrl_handler_setup(). Drivers |
170 | * should never set this flag. |
171 | * @has_changed: Set when the current value differs from the new value. Drivers |
172 | * should never use this flag. |
173 | * @is_private: If set, then this control is private to its handler and it |
174 | * will not be added to any other handlers. Drivers can set |
175 | * this flag. |
176 | * @is_auto: If set, then this control selects whether the other cluster |
177 | * members are in 'automatic' mode or 'manual' mode. This is |
178 | * used for autogain/gain type clusters. Drivers should never |
179 | * set this flag directly. |
180 | * @is_int: If set, then this control has a simple integer value (i.e. it |
181 | * uses ctrl->val). |
182 | * @is_string: If set, then this control has type %V4L2_CTRL_TYPE_STRING. |
183 | * @is_ptr: If set, then this control is an array and/or has type >= |
184 | * %V4L2_CTRL_COMPOUND_TYPES |
185 | * and/or has type %V4L2_CTRL_TYPE_STRING. In other words, &struct |
186 | * v4l2_ext_control uses field p to point to the data. |
187 | * @is_array: If set, then this control contains an N-dimensional array. |
188 | * @is_dyn_array: If set, then this control contains a dynamically sized 1-dimensional array. |
189 | * If this is set, then @is_array is also set. |
190 | * @has_volatiles: If set, then one or more members of the cluster are volatile. |
191 | * Drivers should never touch this flag. |
192 | * @call_notify: If set, then call the handler's notify function whenever the |
193 | * control's value changes. |
194 | * @manual_mode_value: If the is_auto flag is set, then this is the value |
195 | * of the auto control that determines if that control is in |
196 | * manual mode. So if the value of the auto control equals this |
197 | * value, then the whole cluster is in manual mode. Drivers should |
198 | * never set this flag directly. |
199 | * @ops: The control ops. |
200 | * @type_ops: The control type ops. |
201 | * @id: The control ID. |
202 | * @name: The control name. |
203 | * @type: The control type. |
204 | * @minimum: The control's minimum value. |
205 | * @maximum: The control's maximum value. |
206 | * @default_value: The control's default value. |
207 | * @step: The control's step value for non-menu controls. |
208 | * @elems: The number of elements in the N-dimensional array. |
209 | * @elem_size: The size in bytes of the control. |
210 | * @new_elems: The number of elements in p_new. This is the same as @elems, |
211 | * except for dynamic arrays. In that case it is in the range of |
212 | * 1 to @p_array_alloc_elems. |
213 | * @dims: The size of each dimension. |
214 | * @nr_of_dims:The number of dimensions in @dims. |
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 | * Used only if the @type is %V4L2_CTRL_TYPE_MENU. |
226 | * @qmenu_int: A 64-bit integer array for with integer menu items. |
227 | * The size of array must be equal to the menu size, e. g.: |
228 | * :math:`ceil(\frac{maximum - minimum}{step}) + 1`. |
229 | * Used only if the @type is %V4L2_CTRL_TYPE_INTEGER_MENU. |
230 | * @flags: The control's flags. |
231 | * @priv: The control's private pointer. For use by the driver. It is |
232 | * untouched by the control framework. Note that this pointer is |
233 | * not freed when the control is deleted. Should this be needed |
234 | * then a new internal bitfield can be added to tell the framework |
235 | * to free this pointer. |
236 | * @p_array: Pointer to the allocated array. Only valid if @is_array is true. |
237 | * @p_array_alloc_elems: The number of elements in the allocated |
238 | * array for both the cur and new values. So @p_array is actually |
239 | * sized for 2 * @p_array_alloc_elems * @elem_size. Only valid if |
240 | * @is_array is true. |
241 | * @cur: Structure to store the current value. |
242 | * @cur.val: The control's current value, if the @type is represented via |
243 | * a u32 integer (see &enum v4l2_ctrl_type). |
244 | * @val: The control's new s32 value. |
245 | * @p_def: The control's default value represented via a union which |
246 | * provides a standard way of accessing control types |
247 | * through a pointer (for compound controls only). |
248 | * @p_cur: The control's current value represented via a union which |
249 | * provides a standard way of accessing control types |
250 | * through a pointer. |
251 | * @p_new: The control's new value represented via a union which provides |
252 | * a standard way of accessing control types |
253 | * through a pointer. |
254 | */ |
255 | struct v4l2_ctrl { |
256 | /* Administrative fields */ |
257 | struct list_head node; |
258 | struct list_head ev_subs; |
259 | struct v4l2_ctrl_handler *handler; |
260 | struct v4l2_ctrl **cluster; |
261 | unsigned int ncontrols; |
262 | |
263 | unsigned int done:1; |
264 | |
265 | unsigned int is_new:1; |
266 | unsigned int has_changed:1; |
267 | unsigned int is_private:1; |
268 | unsigned int is_auto:1; |
269 | unsigned int is_int:1; |
270 | unsigned int is_string:1; |
271 | unsigned int is_ptr:1; |
272 | unsigned int is_array:1; |
273 | unsigned int is_dyn_array:1; |
274 | unsigned int has_volatiles:1; |
275 | unsigned int call_notify:1; |
276 | unsigned int manual_mode_value:8; |
277 | |
278 | const struct v4l2_ctrl_ops *ops; |
279 | const struct v4l2_ctrl_type_ops *type_ops; |
280 | u32 id; |
281 | const char *name; |
282 | enum v4l2_ctrl_type type; |
283 | s64 minimum, maximum, default_value; |
284 | u32 elems; |
285 | u32 elem_size; |
286 | u32 new_elems; |
287 | u32 dims[V4L2_CTRL_MAX_DIMS]; |
288 | u32 nr_of_dims; |
289 | union { |
290 | u64 step; |
291 | u64 ; |
292 | }; |
293 | union { |
294 | const char * const *; |
295 | const s64 *; |
296 | }; |
297 | unsigned long flags; |
298 | void *priv; |
299 | void *p_array; |
300 | u32 p_array_alloc_elems; |
301 | s32 val; |
302 | struct { |
303 | s32 val; |
304 | } cur; |
305 | |
306 | union v4l2_ctrl_ptr p_def; |
307 | union v4l2_ctrl_ptr p_new; |
308 | union v4l2_ctrl_ptr p_cur; |
309 | }; |
310 | |
311 | /** |
312 | * struct v4l2_ctrl_ref - The control reference. |
313 | * |
314 | * @node: List node for the sorted list. |
315 | * @next: Single-link list node for the hash. |
316 | * @ctrl: The actual control information. |
317 | * @helper: Pointer to helper struct. Used internally in |
318 | * ``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``. |
319 | * @from_other_dev: If true, then @ctrl was defined in another |
320 | * device than the &struct v4l2_ctrl_handler. |
321 | * @req_done: Internal flag: if the control handler containing this control |
322 | * reference is bound to a media request, then this is set when |
323 | * the control has been applied. This prevents applying controls |
324 | * from a cluster with multiple controls twice (when the first |
325 | * control of a cluster is applied, they all are). |
326 | * @p_req_valid: If set, then p_req contains the control value for the request. |
327 | * @p_req_array_enomem: If set, then p_req is invalid since allocating space for |
328 | * an array failed. Attempting to read this value shall |
329 | * result in ENOMEM. Only valid if ctrl->is_array is true. |
330 | * @p_req_array_alloc_elems: The number of elements allocated for the |
331 | * array. Only valid if @p_req_valid and ctrl->is_array are |
332 | * true. |
333 | * @p_req_elems: The number of elements in @p_req. This is the same as |
334 | * ctrl->elems, except for dynamic arrays. In that case it is in |
335 | * the range of 1 to @p_req_array_alloc_elems. Only valid if |
336 | * @p_req_valid is true. |
337 | * @p_req: If the control handler containing this control reference |
338 | * is bound to a media request, then this points to the |
339 | * value of the control that must be applied when the request |
340 | * is executed, or to the value of the control at the time |
341 | * that the request was completed. If @p_req_valid is false, |
342 | * then this control was never set for this request and the |
343 | * control will not be updated when this request is applied. |
344 | * |
345 | * Each control handler has a list of these refs. The list_head is used to |
346 | * keep a sorted-by-control-ID list of all controls, while the next pointer |
347 | * is used to link the control in the hash's bucket. |
348 | */ |
349 | struct v4l2_ctrl_ref { |
350 | struct list_head node; |
351 | struct v4l2_ctrl_ref *next; |
352 | struct v4l2_ctrl *ctrl; |
353 | struct v4l2_ctrl_helper *helper; |
354 | bool from_other_dev; |
355 | bool req_done; |
356 | bool p_req_valid; |
357 | bool p_req_array_enomem; |
358 | u32 p_req_array_alloc_elems; |
359 | u32 p_req_elems; |
360 | union v4l2_ctrl_ptr p_req; |
361 | }; |
362 | |
363 | /** |
364 | * struct v4l2_ctrl_handler - The control handler keeps track of all the |
365 | * controls: both the controls owned by the handler and those inherited |
366 | * from other handlers. |
367 | * |
368 | * @_lock: Default for "lock". |
369 | * @lock: Lock to control access to this handler and its controls. |
370 | * May be replaced by the user right after init. |
371 | * @ctrls: The list of controls owned by this handler. |
372 | * @ctrl_refs: The list of control references. |
373 | * @cached: The last found control reference. It is common that the same |
374 | * control is needed multiple times, so this is a simple |
375 | * optimization. |
376 | * @buckets: Buckets for the hashing. Allows for quick control lookup. |
377 | * @notify: A notify callback that is called whenever the control changes |
378 | * value. |
379 | * Note that the handler's lock is held when the notify function |
380 | * is called! |
381 | * @notify_priv: Passed as argument to the v4l2_ctrl notify callback. |
382 | * @nr_of_buckets: Total number of buckets in the array. |
383 | * @error: The error code of the first failed control addition. |
384 | * @request_is_queued: True if the request was queued. |
385 | * @requests: List to keep track of open control handler request objects. |
386 | * For the parent control handler (@req_obj.ops == NULL) this |
387 | * is the list header. When the parent control handler is |
388 | * removed, it has to unbind and put all these requests since |
389 | * they refer to the parent. |
390 | * @requests_queued: List of the queued requests. This determines the order |
391 | * in which these controls are applied. Once the request is |
392 | * completed it is removed from this list. |
393 | * @req_obj: The &struct media_request_object, used to link into a |
394 | * &struct media_request. This request object has a refcount. |
395 | */ |
396 | struct v4l2_ctrl_handler { |
397 | struct mutex _lock; |
398 | struct mutex *lock; |
399 | struct list_head ctrls; |
400 | struct list_head ctrl_refs; |
401 | struct v4l2_ctrl_ref *cached; |
402 | struct v4l2_ctrl_ref **buckets; |
403 | v4l2_ctrl_notify_fnc notify; |
404 | void *notify_priv; |
405 | u16 nr_of_buckets; |
406 | int error; |
407 | bool request_is_queued; |
408 | struct list_head requests; |
409 | struct list_head requests_queued; |
410 | struct media_request_object req_obj; |
411 | }; |
412 | |
413 | /** |
414 | * struct v4l2_ctrl_config - Control configuration structure. |
415 | * |
416 | * @ops: The control ops. |
417 | * @type_ops: The control type ops. Only needed for compound controls. |
418 | * @id: The control ID. |
419 | * @name: The control name. |
420 | * @type: The control type. |
421 | * @min: The control's minimum value. |
422 | * @max: The control's maximum value. |
423 | * @step: The control's step value for non-menu controls. |
424 | * @def: The control's default value. |
425 | * @p_def: The control's default value for compound controls. |
426 | * @dims: The size of each dimension. |
427 | * @elem_size: The size in bytes of the control. |
428 | * @flags: The control's flags. |
429 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it |
430 | * easy to skip menu items that are not valid. If bit X is set, |
431 | * then menu item X is skipped. Of course, this only works for |
432 | * menus with <= 64 menu items. There are no menus that come |
433 | * close to that number, so this is OK. Should we ever need more, |
434 | * then this will have to be extended to a bit array. |
435 | * @qmenu: A const char * array for all menu items. Array entries that are |
436 | * empty strings ("") correspond to non-existing menu items (this |
437 | * is in addition to the menu_skip_mask above). The last entry |
438 | * must be NULL. |
439 | * @qmenu_int: A const s64 integer array for all menu items of the type |
440 | * V4L2_CTRL_TYPE_INTEGER_MENU. |
441 | * @is_private: If set, then this control is private to its handler and it |
442 | * will not be added to any other handlers. |
443 | */ |
444 | struct v4l2_ctrl_config { |
445 | const struct v4l2_ctrl_ops *ops; |
446 | const struct v4l2_ctrl_type_ops *type_ops; |
447 | u32 id; |
448 | const char *name; |
449 | enum v4l2_ctrl_type type; |
450 | s64 min; |
451 | s64 max; |
452 | u64 step; |
453 | s64 def; |
454 | union v4l2_ctrl_ptr p_def; |
455 | u32 dims[V4L2_CTRL_MAX_DIMS]; |
456 | u32 elem_size; |
457 | u32 flags; |
458 | u64 ; |
459 | const char * const *; |
460 | const s64 *; |
461 | unsigned int is_private:1; |
462 | }; |
463 | |
464 | /** |
465 | * v4l2_ctrl_fill - Fill in the control fields based on the control ID. |
466 | * |
467 | * @id: ID of the control |
468 | * @name: pointer to be filled with a string with the name of the control |
469 | * @type: pointer for storing the type of the control |
470 | * @min: pointer for storing the minimum value for the control |
471 | * @max: pointer for storing the maximum value for the control |
472 | * @step: pointer for storing the control step |
473 | * @def: pointer for storing the default value for the control |
474 | * @flags: pointer for storing the flags to be used on the control |
475 | * |
476 | * This works for all standard V4L2 controls. |
477 | * For non-standard controls it will only fill in the given arguments |
478 | * and @name content will be set to %NULL. |
479 | * |
480 | * This function will overwrite the contents of @name, @type and @flags. |
481 | * The contents of @min, @max, @step and @def may be modified depending on |
482 | * the type. |
483 | * |
484 | * .. note:: |
485 | * |
486 | * Do not use in drivers! It is used internally for backwards compatibility |
487 | * control handling only. Once all drivers are converted to use the new |
488 | * control framework this function will no longer be exported. |
489 | */ |
490 | void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, |
491 | s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags); |
492 | |
493 | |
494 | /** |
495 | * v4l2_ctrl_handler_init_class() - Initialize the control handler. |
496 | * @hdl: The control handler. |
497 | * @nr_of_controls_hint: A hint of how many controls this handler is |
498 | * expected to refer to. This is the total number, so including |
499 | * any inherited controls. It doesn't have to be precise, but if |
500 | * it is way off, then you either waste memory (too many buckets |
501 | * are allocated) or the control lookup becomes slower (not enough |
502 | * buckets are allocated, so there are more slow list lookups). |
503 | * It will always work, though. |
504 | * @key: Used by the lock validator if CONFIG_LOCKDEP is set. |
505 | * @name: Used by the lock validator if CONFIG_LOCKDEP is set. |
506 | * |
507 | * .. attention:: |
508 | * |
509 | * Never use this call directly, always use the v4l2_ctrl_handler_init() |
510 | * macro that hides the @key and @name arguments. |
511 | * |
512 | * Return: returns an error if the buckets could not be allocated. This |
513 | * error will also be stored in @hdl->error. |
514 | */ |
515 | int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl, |
516 | unsigned int nr_of_controls_hint, |
517 | struct lock_class_key *key, const char *name); |
518 | |
519 | #ifdef CONFIG_LOCKDEP |
520 | |
521 | /** |
522 | * v4l2_ctrl_handler_init - helper function to create a static struct |
523 | * &lock_class_key and calls v4l2_ctrl_handler_init_class() |
524 | * |
525 | * @hdl: The control handler. |
526 | * @nr_of_controls_hint: A hint of how many controls this handler is |
527 | * expected to refer to. This is the total number, so including |
528 | * any inherited controls. It doesn't have to be precise, but if |
529 | * it is way off, then you either waste memory (too many buckets |
530 | * are allocated) or the control lookup becomes slower (not enough |
531 | * buckets are allocated, so there are more slow list lookups). |
532 | * It will always work, though. |
533 | * |
534 | * This helper function creates a static struct &lock_class_key and |
535 | * calls v4l2_ctrl_handler_init_class(), providing a proper name for the lock |
536 | * validador. |
537 | * |
538 | * Use this helper function to initialize a control handler. |
539 | */ |
540 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ |
541 | ( \ |
542 | ({ \ |
543 | static struct lock_class_key _key; \ |
544 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \ |
545 | &_key, \ |
546 | KBUILD_BASENAME ":" \ |
547 | __stringify(__LINE__) ":" \ |
548 | "(" #hdl ")->_lock"); \ |
549 | }) \ |
550 | ) |
551 | #else |
552 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ |
553 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL) |
554 | #endif |
555 | |
556 | /** |
557 | * v4l2_ctrl_handler_free() - Free all controls owned by the handler and free |
558 | * the control list. |
559 | * @hdl: The control handler. |
560 | * |
561 | * Does nothing if @hdl == NULL. |
562 | */ |
563 | void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl); |
564 | |
565 | /** |
566 | * v4l2_ctrl_lock() - Helper function to lock the handler |
567 | * associated with the control. |
568 | * @ctrl: The control to lock. |
569 | */ |
570 | static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) |
571 | { |
572 | mutex_lock(ctrl->handler->lock); |
573 | } |
574 | |
575 | /** |
576 | * v4l2_ctrl_unlock() - Helper function to unlock the handler |
577 | * associated with the control. |
578 | * @ctrl: The control to unlock. |
579 | */ |
580 | static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) |
581 | { |
582 | mutex_unlock(lock: ctrl->handler->lock); |
583 | } |
584 | |
585 | /** |
586 | * __v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging |
587 | * to the handler to initialize the hardware to the current control values. The |
588 | * caller is responsible for acquiring the control handler mutex on behalf of |
589 | * __v4l2_ctrl_handler_setup(). |
590 | * @hdl: The control handler. |
591 | * |
592 | * Button controls will be skipped, as are read-only controls. |
593 | * |
594 | * If @hdl == NULL, then this just returns 0. |
595 | */ |
596 | int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); |
597 | |
598 | /** |
599 | * v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging |
600 | * to the handler to initialize the hardware to the current control values. |
601 | * @hdl: The control handler. |
602 | * |
603 | * Button controls will be skipped, as are read-only controls. |
604 | * |
605 | * If @hdl == NULL, then this just returns 0. |
606 | */ |
607 | int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); |
608 | |
609 | /** |
610 | * v4l2_ctrl_handler_log_status() - Log all controls owned by the handler. |
611 | * @hdl: The control handler. |
612 | * @prefix: The prefix to use when logging the control values. If the |
613 | * prefix does not end with a space, then ": " will be added |
614 | * after the prefix. If @prefix == NULL, then no prefix will be |
615 | * used. |
616 | * |
617 | * For use with VIDIOC_LOG_STATUS. |
618 | * |
619 | * Does nothing if @hdl == NULL. |
620 | */ |
621 | void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl, |
622 | const char *prefix); |
623 | |
624 | /** |
625 | * v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2 |
626 | * control. |
627 | * |
628 | * @hdl: The control handler. |
629 | * @cfg: The control's configuration data. |
630 | * @priv: The control's driver-specific private data. |
631 | * |
632 | * If the &v4l2_ctrl struct could not be allocated then NULL is returned |
633 | * and @hdl->error is set to the error code (if it wasn't set already). |
634 | */ |
635 | struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, |
636 | const struct v4l2_ctrl_config *cfg, |
637 | void *priv); |
638 | |
639 | /** |
640 | * v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu |
641 | * control. |
642 | * |
643 | * @hdl: The control handler. |
644 | * @ops: The control ops. |
645 | * @id: The control ID. |
646 | * @min: The control's minimum value. |
647 | * @max: The control's maximum value. |
648 | * @step: The control's step value |
649 | * @def: The control's default value. |
650 | * |
651 | * If the &v4l2_ctrl struct could not be allocated, or the control |
652 | * ID is not known, then NULL is returned and @hdl->error is set to the |
653 | * appropriate error code (if it wasn't set already). |
654 | * |
655 | * If @id refers to a menu control, then this function will return NULL. |
656 | * |
657 | * Use v4l2_ctrl_new_std_menu() when adding menu controls. |
658 | */ |
659 | struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, |
660 | const struct v4l2_ctrl_ops *ops, |
661 | u32 id, s64 min, s64 max, u64 step, |
662 | s64 def); |
663 | |
664 | /** |
665 | * v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 |
666 | * menu control. |
667 | * |
668 | * @hdl: The control handler. |
669 | * @ops: The control ops. |
670 | * @id: The control ID. |
671 | * @max: The control's maximum value. |
672 | * @mask: The control's skip mask for menu controls. This makes it |
673 | * easy to skip menu items that are not valid. If bit X is set, |
674 | * then menu item X is skipped. Of course, this only works for |
675 | * menus with <= 64 menu items. There are no menus that come |
676 | * close to that number, so this is OK. Should we ever need more, |
677 | * then this will have to be extended to a bit array. |
678 | * @def: The control's default value. |
679 | * |
680 | * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value |
681 | * determines which menu items are to be skipped. |
682 | * |
683 | * If @id refers to a non-menu control, then this function will return NULL. |
684 | */ |
685 | struct v4l2_ctrl *(struct v4l2_ctrl_handler *hdl, |
686 | const struct v4l2_ctrl_ops *ops, |
687 | u32 id, u8 max, u64 mask, u8 def); |
688 | |
689 | /** |
690 | * v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control |
691 | * with driver specific menu. |
692 | * |
693 | * @hdl: The control handler. |
694 | * @ops: The control ops. |
695 | * @id: The control ID. |
696 | * @max: The control's maximum value. |
697 | * @mask: The control's skip mask for menu controls. This makes it |
698 | * easy to skip menu items that are not valid. If bit X is set, |
699 | * then menu item X is skipped. Of course, this only works for |
700 | * menus with <= 64 menu items. There are no menus that come |
701 | * close to that number, so this is OK. Should we ever need more, |
702 | * then this will have to be extended to a bit array. |
703 | * @def: The control's default value. |
704 | * @qmenu: The new menu. |
705 | * |
706 | * Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific |
707 | * menu of this control. |
708 | * |
709 | */ |
710 | struct v4l2_ctrl *(struct v4l2_ctrl_handler *hdl, |
711 | const struct v4l2_ctrl_ops *ops, |
712 | u32 id, u8 max, |
713 | u64 mask, u8 def, |
714 | const char * const *); |
715 | |
716 | /** |
717 | * v4l2_ctrl_new_std_compound() - Allocate and initialize a new standard V4L2 |
718 | * compound control. |
719 | * |
720 | * @hdl: The control handler. |
721 | * @ops: The control ops. |
722 | * @id: The control ID. |
723 | * @p_def: The control's default value. |
724 | * |
725 | * Sames as v4l2_ctrl_new_std(), but with support to compound controls, thanks |
726 | * to the @p_def field. Use v4l2_ctrl_ptr_create() to create @p_def from a |
727 | * pointer. Use v4l2_ctrl_ptr_create(NULL) if the default value of the |
728 | * compound control should be all zeroes. |
729 | * |
730 | */ |
731 | struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl, |
732 | const struct v4l2_ctrl_ops *ops, |
733 | u32 id, |
734 | const union v4l2_ctrl_ptr p_def); |
735 | |
736 | /** |
737 | * v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. |
738 | * |
739 | * @hdl: The control handler. |
740 | * @ops: The control ops. |
741 | * @id: The control ID. |
742 | * @max: The control's maximum value. |
743 | * @def: The control's default value. |
744 | * @qmenu_int: The control's menu entries. |
745 | * |
746 | * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionally |
747 | * takes as an argument an array of integers determining the menu items. |
748 | * |
749 | * If @id refers to a non-integer-menu control, then this function will |
750 | * return %NULL. |
751 | */ |
752 | struct v4l2_ctrl *(struct v4l2_ctrl_handler *hdl, |
753 | const struct v4l2_ctrl_ops *ops, |
754 | u32 id, u8 max, u8 def, |
755 | const s64 *); |
756 | |
757 | /** |
758 | * typedef v4l2_ctrl_filter - Typedef to define the filter function to be |
759 | * used when adding a control handler. |
760 | * |
761 | * @ctrl: pointer to struct &v4l2_ctrl. |
762 | */ |
763 | |
764 | typedef bool (*v4l2_ctrl_filter)(const struct v4l2_ctrl *ctrl); |
765 | |
766 | /** |
767 | * v4l2_ctrl_add_handler() - Add all controls from handler @add to |
768 | * handler @hdl. |
769 | * |
770 | * @hdl: The control handler. |
771 | * @add: The control handler whose controls you want to add to |
772 | * the @hdl control handler. |
773 | * @filter: This function will filter which controls should be added. |
774 | * @from_other_dev: If true, then the controls in @add were defined in another |
775 | * device than @hdl. |
776 | * |
777 | * Does nothing if either of the two handlers is a NULL pointer. |
778 | * If @filter is NULL, then all controls are added. Otherwise only those |
779 | * controls for which @filter returns true will be added. |
780 | * In case of an error @hdl->error will be set to the error code (if it |
781 | * wasn't set already). |
782 | */ |
783 | int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, |
784 | struct v4l2_ctrl_handler *add, |
785 | v4l2_ctrl_filter filter, |
786 | bool from_other_dev); |
787 | |
788 | /** |
789 | * v4l2_ctrl_radio_filter() - Standard filter for radio controls. |
790 | * |
791 | * @ctrl: The control that is filtered. |
792 | * |
793 | * This will return true for any controls that are valid for radio device |
794 | * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM |
795 | * transmitter class controls. |
796 | * |
797 | * This function is to be used with v4l2_ctrl_add_handler(). |
798 | */ |
799 | bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl); |
800 | |
801 | /** |
802 | * v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging |
803 | * to that cluster. |
804 | * |
805 | * @ncontrols: The number of controls in this cluster. |
806 | * @controls: The cluster control array of size @ncontrols. |
807 | */ |
808 | void v4l2_ctrl_cluster(unsigned int ncontrols, struct v4l2_ctrl **controls); |
809 | |
810 | |
811 | /** |
812 | * v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging |
813 | * to that cluster and set it up for autofoo/foo-type handling. |
814 | * |
815 | * @ncontrols: The number of controls in this cluster. |
816 | * @controls: The cluster control array of size @ncontrols. The first control |
817 | * must be the 'auto' control (e.g. autogain, autoexposure, etc.) |
818 | * @manual_val: The value for the first control in the cluster that equals the |
819 | * manual setting. |
820 | * @set_volatile: If true, then all controls except the first auto control will |
821 | * be volatile. |
822 | * |
823 | * Use for control groups where one control selects some automatic feature and |
824 | * the other controls are only active whenever the automatic feature is turned |
825 | * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs |
826 | * red and blue balance, etc. |
827 | * |
828 | * The behavior of such controls is as follows: |
829 | * |
830 | * When the autofoo control is set to automatic, then any manual controls |
831 | * are set to inactive and any reads will call g_volatile_ctrl (if the control |
832 | * was marked volatile). |
833 | * |
834 | * When the autofoo control is set to manual, then any manual controls will |
835 | * be marked active, and any reads will just return the current value without |
836 | * going through g_volatile_ctrl. |
837 | * |
838 | * In addition, this function will set the %V4L2_CTRL_FLAG_UPDATE flag |
839 | * on the autofoo control and %V4L2_CTRL_FLAG_INACTIVE on the foo control(s) |
840 | * if autofoo is in auto mode. |
841 | */ |
842 | void v4l2_ctrl_auto_cluster(unsigned int ncontrols, |
843 | struct v4l2_ctrl **controls, |
844 | u8 manual_val, bool set_volatile); |
845 | |
846 | |
847 | /** |
848 | * v4l2_ctrl_find() - Find a control with the given ID. |
849 | * |
850 | * @hdl: The control handler. |
851 | * @id: The control ID to find. |
852 | * |
853 | * If @hdl == NULL this will return NULL as well. Will lock the handler so |
854 | * do not use from inside &v4l2_ctrl_ops. |
855 | */ |
856 | struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); |
857 | |
858 | /** |
859 | * v4l2_ctrl_activate() - Make the control active or inactive. |
860 | * @ctrl: The control to (de)activate. |
861 | * @active: True if the control should become active. |
862 | * |
863 | * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically. |
864 | * Does nothing if @ctrl == NULL. |
865 | * This will usually be called from within the s_ctrl op. |
866 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
867 | * |
868 | * This function assumes that the control handler is locked. |
869 | */ |
870 | void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active); |
871 | |
872 | /** |
873 | * __v4l2_ctrl_grab() - Unlocked variant of v4l2_ctrl_grab. |
874 | * |
875 | * @ctrl: The control to (de)activate. |
876 | * @grabbed: True if the control should become grabbed. |
877 | * |
878 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. |
879 | * Does nothing if @ctrl == NULL. |
880 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
881 | * This will usually be called when starting or stopping streaming in the |
882 | * driver. |
883 | * |
884 | * This function assumes that the control handler is locked by the caller. |
885 | */ |
886 | void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed); |
887 | |
888 | /** |
889 | * v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed. |
890 | * |
891 | * @ctrl: The control to (de)activate. |
892 | * @grabbed: True if the control should become grabbed. |
893 | * |
894 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. |
895 | * Does nothing if @ctrl == NULL. |
896 | * The V4L2_EVENT_CTRL event will be generated afterwards. |
897 | * This will usually be called when starting or stopping streaming in the |
898 | * driver. |
899 | * |
900 | * This function assumes that the control handler is not locked and will |
901 | * take the lock itself. |
902 | */ |
903 | static inline void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed) |
904 | { |
905 | if (!ctrl) |
906 | return; |
907 | |
908 | v4l2_ctrl_lock(ctrl); |
909 | __v4l2_ctrl_grab(ctrl, grabbed); |
910 | v4l2_ctrl_unlock(ctrl); |
911 | } |
912 | |
913 | /** |
914 | *__v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range() |
915 | * |
916 | * @ctrl: The control to update. |
917 | * @min: The control's minimum value. |
918 | * @max: The control's maximum value. |
919 | * @step: The control's step value |
920 | * @def: The control's default value. |
921 | * |
922 | * Update the range of a control on the fly. This works for control types |
923 | * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the |
924 | * @step value is interpreted as a menu_skip_mask. |
925 | * |
926 | * An error is returned if one of the range arguments is invalid for this |
927 | * control type. |
928 | * |
929 | * The caller is responsible for acquiring the control handler mutex on behalf |
930 | * of __v4l2_ctrl_modify_range(). |
931 | */ |
932 | int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, |
933 | s64 min, s64 max, u64 step, s64 def); |
934 | |
935 | /** |
936 | * v4l2_ctrl_modify_range() - Update the range of a control. |
937 | * |
938 | * @ctrl: The control to update. |
939 | * @min: The control's minimum value. |
940 | * @max: The control's maximum value. |
941 | * @step: The control's step value |
942 | * @def: The control's default value. |
943 | * |
944 | * Update the range of a control on the fly. This works for control types |
945 | * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the |
946 | * @step value is interpreted as a menu_skip_mask. |
947 | * |
948 | * An error is returned if one of the range arguments is invalid for this |
949 | * control type. |
950 | * |
951 | * This function assumes that the control handler is not locked and will |
952 | * take the lock itself. |
953 | */ |
954 | static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, |
955 | s64 min, s64 max, u64 step, s64 def) |
956 | { |
957 | int rval; |
958 | |
959 | v4l2_ctrl_lock(ctrl); |
960 | rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def); |
961 | v4l2_ctrl_unlock(ctrl); |
962 | |
963 | return rval; |
964 | } |
965 | |
966 | /** |
967 | *__v4l2_ctrl_modify_dimensions() - Unlocked variant of v4l2_ctrl_modify_dimensions() |
968 | * |
969 | * @ctrl: The control to update. |
970 | * @dims: The control's new dimensions. |
971 | * |
972 | * Update the dimensions of an array control on the fly. The elements of the |
973 | * array are reset to their default value, even if the dimensions are |
974 | * unchanged. |
975 | * |
976 | * An error is returned if @dims is invalid for this control. |
977 | * |
978 | * The caller is responsible for acquiring the control handler mutex on behalf |
979 | * of __v4l2_ctrl_modify_dimensions(). |
980 | * |
981 | * Note: calling this function when the same control is used in pending requests |
982 | * is untested. It should work (a request with the wrong size of the control |
983 | * will drop that control silently), but it will be very confusing. |
984 | */ |
985 | int __v4l2_ctrl_modify_dimensions(struct v4l2_ctrl *ctrl, |
986 | u32 dims[V4L2_CTRL_MAX_DIMS]); |
987 | |
988 | /** |
989 | * v4l2_ctrl_modify_dimensions() - Update the dimensions of an array control. |
990 | * |
991 | * @ctrl: The control to update. |
992 | * @dims: The control's new dimensions. |
993 | * |
994 | * Update the dimensions of an array control on the fly. The elements of the |
995 | * array are reset to their default value, even if the dimensions are |
996 | * unchanged. |
997 | * |
998 | * An error is returned if @dims is invalid for this control type. |
999 | * |
1000 | * This function assumes that the control handler is not locked and will |
1001 | * take the lock itself. |
1002 | * |
1003 | * Note: calling this function when the same control is used in pending requests |
1004 | * is untested. It should work (a request with the wrong size of the control |
1005 | * will drop that control silently), but it will be very confusing. |
1006 | */ |
1007 | static inline int v4l2_ctrl_modify_dimensions(struct v4l2_ctrl *ctrl, |
1008 | u32 dims[V4L2_CTRL_MAX_DIMS]) |
1009 | { |
1010 | int rval; |
1011 | |
1012 | v4l2_ctrl_lock(ctrl); |
1013 | rval = __v4l2_ctrl_modify_dimensions(ctrl, dims); |
1014 | v4l2_ctrl_unlock(ctrl); |
1015 | |
1016 | return rval; |
1017 | } |
1018 | |
1019 | /** |
1020 | * v4l2_ctrl_notify() - Function to set a notify callback for a control. |
1021 | * |
1022 | * @ctrl: The control. |
1023 | * @notify: The callback function. |
1024 | * @priv: The callback private handle, passed as argument to the callback. |
1025 | * |
1026 | * This function sets a callback function for the control. If @ctrl is NULL, |
1027 | * then it will do nothing. If @notify is NULL, then the notify callback will |
1028 | * be removed. |
1029 | * |
1030 | * There can be only one notify. If another already exists, then a WARN_ON |
1031 | * will be issued and the function will do nothing. |
1032 | */ |
1033 | void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, |
1034 | void *priv); |
1035 | |
1036 | /** |
1037 | * v4l2_ctrl_get_name() - Get the name of the control |
1038 | * |
1039 | * @id: The control ID. |
1040 | * |
1041 | * This function returns the name of the given control ID or NULL if it isn't |
1042 | * a known control. |
1043 | */ |
1044 | const char *v4l2_ctrl_get_name(u32 id); |
1045 | |
1046 | /** |
1047 | * v4l2_ctrl_get_menu() - Get the menu string array of the control |
1048 | * |
1049 | * @id: The control ID. |
1050 | * |
1051 | * This function returns the NULL-terminated menu string array name of the |
1052 | * given control ID or NULL if it isn't a known menu control. |
1053 | */ |
1054 | const char * const *(u32 id); |
1055 | |
1056 | /** |
1057 | * v4l2_ctrl_get_int_menu() - Get the integer menu array of the control |
1058 | * |
1059 | * @id: The control ID. |
1060 | * @len: The size of the integer array. |
1061 | * |
1062 | * This function returns the integer array of the given control ID or NULL if it |
1063 | * if it isn't a known integer menu control. |
1064 | */ |
1065 | const s64 *(u32 id, u32 *len); |
1066 | |
1067 | /** |
1068 | * v4l2_ctrl_g_ctrl() - Helper function to get the control's value from |
1069 | * within a driver. |
1070 | * |
1071 | * @ctrl: The control. |
1072 | * |
1073 | * This returns the control's value safely by going through the control |
1074 | * framework. This function will lock the control's handler, so it cannot be |
1075 | * used from within the &v4l2_ctrl_ops functions. |
1076 | * |
1077 | * This function is for integer type controls only. |
1078 | */ |
1079 | s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl); |
1080 | |
1081 | /** |
1082 | * __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl(). |
1083 | * |
1084 | * @ctrl: The control. |
1085 | * @val: The new value. |
1086 | * |
1087 | * This sets the control's new value safely by going through the control |
1088 | * framework. This function assumes the control's handler is already locked, |
1089 | * allowing it to be used from within the &v4l2_ctrl_ops functions. |
1090 | * |
1091 | * This function is for integer type controls only. |
1092 | */ |
1093 | int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val); |
1094 | |
1095 | /** |
1096 | * v4l2_ctrl_s_ctrl() - Helper function to set the control's value from |
1097 | * within a driver. |
1098 | * @ctrl: The control. |
1099 | * @val: The new value. |
1100 | * |
1101 | * This sets the control's new value safely by going through the control |
1102 | * framework. This function will lock the control's handler, so it cannot be |
1103 | * used from within the &v4l2_ctrl_ops functions. |
1104 | * |
1105 | * This function is for integer type controls only. |
1106 | */ |
1107 | static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val) |
1108 | { |
1109 | int rval; |
1110 | |
1111 | v4l2_ctrl_lock(ctrl); |
1112 | rval = __v4l2_ctrl_s_ctrl(ctrl, val); |
1113 | v4l2_ctrl_unlock(ctrl); |
1114 | |
1115 | return rval; |
1116 | } |
1117 | |
1118 | /** |
1119 | * v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value |
1120 | * from within a driver. |
1121 | * |
1122 | * @ctrl: The control. |
1123 | * |
1124 | * This returns the control's value safely by going through the control |
1125 | * framework. This function will lock the control's handler, so it cannot be |
1126 | * used from within the &v4l2_ctrl_ops functions. |
1127 | * |
1128 | * This function is for 64-bit integer type controls only. |
1129 | */ |
1130 | s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl); |
1131 | |
1132 | /** |
1133 | * __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64(). |
1134 | * |
1135 | * @ctrl: The control. |
1136 | * @val: The new value. |
1137 | * |
1138 | * This sets the control's new value safely by going through the control |
1139 | * framework. This function assumes the control's handler is already locked, |
1140 | * allowing it to be used from within the &v4l2_ctrl_ops functions. |
1141 | * |
1142 | * This function is for 64-bit integer type controls only. |
1143 | */ |
1144 | int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val); |
1145 | |
1146 | /** |
1147 | * v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value |
1148 | * from within a driver. |
1149 | * |
1150 | * @ctrl: The control. |
1151 | * @val: The new value. |
1152 | * |
1153 | * This sets the control's new value safely by going through the control |
1154 | * framework. This function will lock the control's handler, so it cannot be |
1155 | * used from within the &v4l2_ctrl_ops functions. |
1156 | * |
1157 | * This function is for 64-bit integer type controls only. |
1158 | */ |
1159 | static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val) |
1160 | { |
1161 | int rval; |
1162 | |
1163 | v4l2_ctrl_lock(ctrl); |
1164 | rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val); |
1165 | v4l2_ctrl_unlock(ctrl); |
1166 | |
1167 | return rval; |
1168 | } |
1169 | |
1170 | /** |
1171 | * __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string(). |
1172 | * |
1173 | * @ctrl: The control. |
1174 | * @s: The new string. |
1175 | * |
1176 | * This sets the control's new string safely by going through the control |
1177 | * framework. This function assumes the control's handler is already locked, |
1178 | * allowing it to be used from within the &v4l2_ctrl_ops functions. |
1179 | * |
1180 | * This function is for string type controls only. |
1181 | */ |
1182 | int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s); |
1183 | |
1184 | /** |
1185 | * v4l2_ctrl_s_ctrl_string() - Helper function to set a control's string value |
1186 | * from within a driver. |
1187 | * |
1188 | * @ctrl: The control. |
1189 | * @s: The new string. |
1190 | * |
1191 | * This sets the control's new string safely by going through the control |
1192 | * framework. This function will lock the control's handler, so it cannot be |
1193 | * used from within the &v4l2_ctrl_ops functions. |
1194 | * |
1195 | * This function is for string type controls only. |
1196 | */ |
1197 | static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s) |
1198 | { |
1199 | int rval; |
1200 | |
1201 | v4l2_ctrl_lock(ctrl); |
1202 | rval = __v4l2_ctrl_s_ctrl_string(ctrl, s); |
1203 | v4l2_ctrl_unlock(ctrl); |
1204 | |
1205 | return rval; |
1206 | } |
1207 | |
1208 | /** |
1209 | * __v4l2_ctrl_s_ctrl_compound() - Unlocked variant to set a compound control |
1210 | * |
1211 | * @ctrl: The control. |
1212 | * @type: The type of the data. |
1213 | * @p: The new compound payload. |
1214 | * |
1215 | * This sets the control's new compound payload safely by going through the |
1216 | * control framework. This function assumes the control's handler is already |
1217 | * locked, allowing it to be used from within the &v4l2_ctrl_ops functions. |
1218 | * |
1219 | * This function is for compound type controls only. |
1220 | */ |
1221 | int __v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl, |
1222 | enum v4l2_ctrl_type type, const void *p); |
1223 | |
1224 | /** |
1225 | * v4l2_ctrl_s_ctrl_compound() - Helper function to set a compound control |
1226 | * from within a driver. |
1227 | * |
1228 | * @ctrl: The control. |
1229 | * @type: The type of the data. |
1230 | * @p: The new compound payload. |
1231 | * |
1232 | * This sets the control's new compound payload safely by going through the |
1233 | * control framework. This function will lock the control's handler, so it |
1234 | * cannot be used from within the &v4l2_ctrl_ops functions. |
1235 | * |
1236 | * This function is for compound type controls only. |
1237 | */ |
1238 | static inline int v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl, |
1239 | enum v4l2_ctrl_type type, |
1240 | const void *p) |
1241 | { |
1242 | int rval; |
1243 | |
1244 | v4l2_ctrl_lock(ctrl); |
1245 | rval = __v4l2_ctrl_s_ctrl_compound(ctrl, type, p); |
1246 | v4l2_ctrl_unlock(ctrl); |
1247 | |
1248 | return rval; |
1249 | } |
1250 | |
1251 | /* Helper defines for area type controls */ |
1252 | #define __v4l2_ctrl_s_ctrl_area(ctrl, area) \ |
1253 | __v4l2_ctrl_s_ctrl_compound((ctrl), V4L2_CTRL_TYPE_AREA, (area)) |
1254 | #define v4l2_ctrl_s_ctrl_area(ctrl, area) \ |
1255 | v4l2_ctrl_s_ctrl_compound((ctrl), V4L2_CTRL_TYPE_AREA, (area)) |
1256 | |
1257 | /* Internal helper functions that deal with control events. */ |
1258 | extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops; |
1259 | |
1260 | /** |
1261 | * v4l2_ctrl_replace - Function to be used as a callback to |
1262 | * &struct v4l2_subscribed_event_ops replace\(\) |
1263 | * |
1264 | * @old: pointer to struct &v4l2_event with the reported |
1265 | * event; |
1266 | * @new: pointer to struct &v4l2_event with the modified |
1267 | * event; |
1268 | */ |
1269 | void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new); |
1270 | |
1271 | /** |
1272 | * v4l2_ctrl_merge - Function to be used as a callback to |
1273 | * &struct v4l2_subscribed_event_ops merge(\) |
1274 | * |
1275 | * @old: pointer to struct &v4l2_event with the reported |
1276 | * event; |
1277 | * @new: pointer to struct &v4l2_event with the merged |
1278 | * event; |
1279 | */ |
1280 | void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new); |
1281 | |
1282 | /** |
1283 | * v4l2_ctrl_log_status - helper function to implement %VIDIOC_LOG_STATUS ioctl |
1284 | * |
1285 | * @file: pointer to struct file |
1286 | * @fh: unused. Kept just to be compatible to the arguments expected by |
1287 | * &struct v4l2_ioctl_ops.vidioc_log_status. |
1288 | * |
1289 | * Can be used as a vidioc_log_status function that just dumps all controls |
1290 | * associated with the filehandle. |
1291 | */ |
1292 | int v4l2_ctrl_log_status(struct file *file, void *fh); |
1293 | |
1294 | /** |
1295 | * v4l2_ctrl_subscribe_event - Subscribes to an event |
1296 | * |
1297 | * |
1298 | * @fh: pointer to struct v4l2_fh |
1299 | * @sub: pointer to &struct v4l2_event_subscription |
1300 | * |
1301 | * Can be used as a vidioc_subscribe_event function that just subscribes |
1302 | * control events. |
1303 | */ |
1304 | int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh, |
1305 | const struct v4l2_event_subscription *sub); |
1306 | |
1307 | /** |
1308 | * v4l2_ctrl_poll - function to be used as a callback to the poll() |
1309 | * That just polls for control events. |
1310 | * |
1311 | * @file: pointer to struct file |
1312 | * @wait: pointer to struct poll_table_struct |
1313 | */ |
1314 | __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait); |
1315 | |
1316 | /** |
1317 | * v4l2_ctrl_request_setup - helper function to apply control values in a request |
1318 | * |
1319 | * @req: The request |
1320 | * @parent: The parent control handler ('priv' in media_request_object_find()) |
1321 | * |
1322 | * This is a helper function to call the control handler's s_ctrl callback with |
1323 | * the control values contained in the request. Do note that this approach of |
1324 | * applying control values in a request is only applicable to memory-to-memory |
1325 | * devices. |
1326 | */ |
1327 | int v4l2_ctrl_request_setup(struct media_request *req, |
1328 | struct v4l2_ctrl_handler *parent); |
1329 | |
1330 | /** |
1331 | * v4l2_ctrl_request_complete - Complete a control handler request object |
1332 | * |
1333 | * @req: The request |
1334 | * @parent: The parent control handler ('priv' in media_request_object_find()) |
1335 | * |
1336 | * This function is to be called on each control handler that may have had a |
1337 | * request object associated with it, i.e. control handlers of a driver that |
1338 | * supports requests. |
1339 | * |
1340 | * The function first obtains the values of any volatile controls in the control |
1341 | * handler and attach them to the request. Then, the function completes the |
1342 | * request object. |
1343 | */ |
1344 | void v4l2_ctrl_request_complete(struct media_request *req, |
1345 | struct v4l2_ctrl_handler *parent); |
1346 | |
1347 | /** |
1348 | * v4l2_ctrl_request_hdl_find - Find the control handler in the request |
1349 | * |
1350 | * @req: The request |
1351 | * @parent: The parent control handler ('priv' in media_request_object_find()) |
1352 | * |
1353 | * This function finds the control handler in the request. It may return |
1354 | * NULL if not found. When done, you must call v4l2_ctrl_request_hdl_put() |
1355 | * with the returned handler pointer. |
1356 | * |
1357 | * If the request is not in state VALIDATING or QUEUED, then this function |
1358 | * will always return NULL. |
1359 | * |
1360 | * Note that in state VALIDATING the req_queue_mutex is held, so |
1361 | * no objects can be added or deleted from the request. |
1362 | * |
1363 | * In state QUEUED it is the driver that will have to ensure this. |
1364 | */ |
1365 | struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req, |
1366 | struct v4l2_ctrl_handler *parent); |
1367 | |
1368 | /** |
1369 | * v4l2_ctrl_request_hdl_put - Put the control handler |
1370 | * |
1371 | * @hdl: Put this control handler |
1372 | * |
1373 | * This function released the control handler previously obtained from' |
1374 | * v4l2_ctrl_request_hdl_find(). |
1375 | */ |
1376 | static inline void v4l2_ctrl_request_hdl_put(struct v4l2_ctrl_handler *hdl) |
1377 | { |
1378 | if (hdl) |
1379 | media_request_object_put(obj: &hdl->req_obj); |
1380 | } |
1381 | |
1382 | /** |
1383 | * v4l2_ctrl_request_hdl_ctrl_find() - Find a control with the given ID. |
1384 | * |
1385 | * @hdl: The control handler from the request. |
1386 | * @id: The ID of the control to find. |
1387 | * |
1388 | * This function returns a pointer to the control if this control is |
1389 | * part of the request or NULL otherwise. |
1390 | */ |
1391 | struct v4l2_ctrl * |
1392 | v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); |
1393 | |
1394 | /* Helpers for ioctl_ops */ |
1395 | |
1396 | /** |
1397 | * v4l2_queryctrl - Helper function to implement |
1398 | * :ref:`VIDIOC_QUERYCTRL <vidioc_queryctrl>` ioctl |
1399 | * |
1400 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1401 | * @qc: pointer to &struct v4l2_queryctrl |
1402 | * |
1403 | * If hdl == NULL then they will all return -EINVAL. |
1404 | */ |
1405 | int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc); |
1406 | |
1407 | /** |
1408 | * v4l2_query_ext_ctrl - Helper function to implement |
1409 | * :ref:`VIDIOC_QUERY_EXT_CTRL <vidioc_queryctrl>` ioctl |
1410 | * |
1411 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1412 | * @qc: pointer to &struct v4l2_query_ext_ctrl |
1413 | * |
1414 | * If hdl == NULL then they will all return -EINVAL. |
1415 | */ |
1416 | int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, |
1417 | struct v4l2_query_ext_ctrl *qc); |
1418 | |
1419 | /** |
1420 | * v4l2_querymenu - Helper function to implement |
1421 | * :ref:`VIDIOC_QUERYMENU <vidioc_queryctrl>` ioctl |
1422 | * |
1423 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1424 | * @qm: pointer to &struct v4l2_querymenu |
1425 | * |
1426 | * If hdl == NULL then they will all return -EINVAL. |
1427 | */ |
1428 | int (struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm); |
1429 | |
1430 | /** |
1431 | * v4l2_g_ctrl - Helper function to implement |
1432 | * :ref:`VIDIOC_G_CTRL <vidioc_g_ctrl>` ioctl |
1433 | * |
1434 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1435 | * @ctrl: pointer to &struct v4l2_control |
1436 | * |
1437 | * If hdl == NULL then they will all return -EINVAL. |
1438 | */ |
1439 | int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl); |
1440 | |
1441 | /** |
1442 | * v4l2_s_ctrl - Helper function to implement |
1443 | * :ref:`VIDIOC_S_CTRL <vidioc_g_ctrl>` ioctl |
1444 | * |
1445 | * @fh: pointer to &struct v4l2_fh |
1446 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1447 | * |
1448 | * @ctrl: pointer to &struct v4l2_control |
1449 | * |
1450 | * If hdl == NULL then they will all return -EINVAL. |
1451 | */ |
1452 | int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
1453 | struct v4l2_control *ctrl); |
1454 | |
1455 | /** |
1456 | * v4l2_g_ext_ctrls - Helper function to implement |
1457 | * :ref:`VIDIOC_G_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl |
1458 | * |
1459 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1460 | * @vdev: pointer to &struct video_device |
1461 | * @mdev: pointer to &struct media_device |
1462 | * @c: pointer to &struct v4l2_ext_controls |
1463 | * |
1464 | * If hdl == NULL then they will all return -EINVAL. |
1465 | */ |
1466 | int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev, |
1467 | struct media_device *mdev, struct v4l2_ext_controls *c); |
1468 | |
1469 | /** |
1470 | * v4l2_try_ext_ctrls - Helper function to implement |
1471 | * :ref:`VIDIOC_TRY_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl |
1472 | * |
1473 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1474 | * @vdev: pointer to &struct video_device |
1475 | * @mdev: pointer to &struct media_device |
1476 | * @c: pointer to &struct v4l2_ext_controls |
1477 | * |
1478 | * If hdl == NULL then they will all return -EINVAL. |
1479 | */ |
1480 | int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, |
1481 | struct video_device *vdev, |
1482 | struct media_device *mdev, |
1483 | struct v4l2_ext_controls *c); |
1484 | |
1485 | /** |
1486 | * v4l2_s_ext_ctrls - Helper function to implement |
1487 | * :ref:`VIDIOC_S_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl |
1488 | * |
1489 | * @fh: pointer to &struct v4l2_fh |
1490 | * @hdl: pointer to &struct v4l2_ctrl_handler |
1491 | * @vdev: pointer to &struct video_device |
1492 | * @mdev: pointer to &struct media_device |
1493 | * @c: pointer to &struct v4l2_ext_controls |
1494 | * |
1495 | * If hdl == NULL then they will all return -EINVAL. |
1496 | */ |
1497 | int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
1498 | struct video_device *vdev, |
1499 | struct media_device *mdev, |
1500 | struct v4l2_ext_controls *c); |
1501 | |
1502 | /** |
1503 | * v4l2_ctrl_subdev_subscribe_event - Helper function to implement |
1504 | * as a &struct v4l2_subdev_core_ops subscribe_event function |
1505 | * that just subscribes control events. |
1506 | * |
1507 | * @sd: pointer to &struct v4l2_subdev |
1508 | * @fh: pointer to &struct v4l2_fh |
1509 | * @sub: pointer to &struct v4l2_event_subscription |
1510 | */ |
1511 | int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, |
1512 | struct v4l2_event_subscription *sub); |
1513 | |
1514 | /** |
1515 | * v4l2_ctrl_subdev_log_status - Log all controls owned by subdev's control |
1516 | * handler. |
1517 | * |
1518 | * @sd: pointer to &struct v4l2_subdev |
1519 | */ |
1520 | int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd); |
1521 | |
1522 | /** |
1523 | * v4l2_ctrl_new_fwnode_properties() - Register controls for the device |
1524 | * properties |
1525 | * |
1526 | * @hdl: pointer to &struct v4l2_ctrl_handler to register controls on |
1527 | * @ctrl_ops: pointer to &struct v4l2_ctrl_ops to register controls with |
1528 | * @p: pointer to &struct v4l2_fwnode_device_properties |
1529 | * |
1530 | * This function registers controls associated to device properties, using the |
1531 | * property values contained in @p parameter, if the property has been set to |
1532 | * a value. |
1533 | * |
1534 | * Currently the following v4l2 controls are parsed and registered: |
1535 | * - V4L2_CID_CAMERA_ORIENTATION |
1536 | * - V4L2_CID_CAMERA_SENSOR_ROTATION; |
1537 | * |
1538 | * Controls already registered by the caller with the @hdl control handler are |
1539 | * not overwritten. Callers should register the controls they want to handle |
1540 | * themselves before calling this function. |
1541 | * |
1542 | * Return: 0 on success, a negative error code on failure. |
1543 | */ |
1544 | int v4l2_ctrl_new_fwnode_properties(struct v4l2_ctrl_handler *hdl, |
1545 | const struct v4l2_ctrl_ops *ctrl_ops, |
1546 | const struct v4l2_fwnode_device_properties *p); |
1547 | |
1548 | /** |
1549 | * v4l2_ctrl_type_op_equal - Default v4l2_ctrl_type_ops equal callback. |
1550 | * |
1551 | * @ctrl: The v4l2_ctrl pointer. |
1552 | * @ptr1: A v4l2 control value. |
1553 | * @ptr2: A v4l2 control value. |
1554 | * |
1555 | * Return: true if values are equal, otherwise false. |
1556 | */ |
1557 | bool v4l2_ctrl_type_op_equal(const struct v4l2_ctrl *ctrl, |
1558 | union v4l2_ctrl_ptr ptr1, union v4l2_ctrl_ptr ptr2); |
1559 | |
1560 | /** |
1561 | * v4l2_ctrl_type_op_init - Default v4l2_ctrl_type_ops init callback. |
1562 | * |
1563 | * @ctrl: The v4l2_ctrl pointer. |
1564 | * @from_idx: Starting element index. |
1565 | * @ptr: The v4l2 control value. |
1566 | * |
1567 | * Return: void |
1568 | */ |
1569 | void v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, |
1570 | union v4l2_ctrl_ptr ptr); |
1571 | |
1572 | /** |
1573 | * v4l2_ctrl_type_op_log - Default v4l2_ctrl_type_ops log callback. |
1574 | * |
1575 | * @ctrl: The v4l2_ctrl pointer. |
1576 | * |
1577 | * Return: void |
1578 | */ |
1579 | void v4l2_ctrl_type_op_log(const struct v4l2_ctrl *ctrl); |
1580 | |
1581 | /** |
1582 | * v4l2_ctrl_type_op_validate - Default v4l2_ctrl_type_ops validate callback. |
1583 | * |
1584 | * @ctrl: The v4l2_ctrl pointer. |
1585 | * @ptr: The v4l2 control value. |
1586 | * |
1587 | * Return: 0 on success, a negative error code on failure. |
1588 | */ |
1589 | int v4l2_ctrl_type_op_validate(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr ptr); |
1590 | |
1591 | #endif |
1592 | |