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0996517c | 1 | /* |
8ec4bee7 MCC |
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. | |
0996517c HV |
15 | */ |
16 | ||
17 | #ifndef _V4L2_CTRLS_H | |
18 | #define _V4L2_CTRLS_H | |
19 | ||
20 | #include <linux/list.h> | |
a19dec6e | 21 | #include <linux/mutex.h> |
01c40c04 | 22 | #include <linux/videodev2.h> |
52beeddb | 23 | #include <media/media-request.h> |
0996517c HV |
24 | |
25 | /* forward references */ | |
528f0f78 | 26 | struct file; |
0996517c | 27 | struct v4l2_ctrl_handler; |
eb5b16ef | 28 | struct v4l2_ctrl_helper; |
0996517c HV |
29 | struct v4l2_ctrl; |
30 | struct video_device; | |
31 | struct v4l2_subdev; | |
77068d36 | 32 | struct v4l2_subscribed_event; |
6e239399 | 33 | struct v4l2_fh; |
a26243b0 | 34 | struct poll_table_struct; |
0996517c | 35 | |
8c2721d5 MCC |
36 | /** |
37 | * union v4l2_ctrl_ptr - A pointer to a control value. | |
c27bb30e PK |
38 | * @p_s32: Pointer to a 32-bit signed value. |
39 | * @p_s64: Pointer to a 64-bit signed value. | |
40 | * @p_u8: Pointer to a 8-bit unsigned value. | |
41 | * @p_u16: Pointer to a 16-bit unsigned value. | |
42 | * @p_u32: Pointer to a 32-bit unsigned value. | |
43 | * @p_char: Pointer to a string. | |
44 | * @p_mpeg2_slice_params: Pointer to a MPEG2 slice parameters structure. | |
45 | * @p_mpeg2_quantization: Pointer to a MPEG2 quantization data structure. | |
46 | * @p: Pointer to a compound value. | |
0176077a HV |
47 | */ |
48 | union v4l2_ctrl_ptr { | |
49 | s32 *p_s32; | |
50 | s64 *p_s64; | |
dda4a4d5 HV |
51 | u8 *p_u8; |
52 | u16 *p_u16; | |
811c5081 | 53 | u32 *p_u32; |
0176077a | 54 | char *p_char; |
c27bb30e PK |
55 | struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params; |
56 | struct v4l2_ctrl_mpeg2_quantization *p_mpeg2_quantization; | |
0176077a HV |
57 | void *p; |
58 | }; | |
59 | ||
8c2721d5 MCC |
60 | /** |
61 | * struct v4l2_ctrl_ops - The control operations that the driver has to provide. | |
8ec4bee7 | 62 | * |
8c2721d5 MCC |
63 | * @g_volatile_ctrl: Get a new value for this control. Generally only relevant |
64 | * for volatile (and usually read-only) controls such as a control | |
65 | * that returns the current signal strength which changes | |
66 | * continuously. | |
67 | * If not set, then the currently cached value will be returned. | |
68 | * @try_ctrl: Test whether the control's value is valid. Only relevant when | |
69 | * the usual min/max/step checks are not sufficient. | |
70 | * @s_ctrl: Actually set the new control value. s_ctrl is compulsory. The | |
71 | * ctrl->handler->lock is held when these ops are called, so no | |
72 | * one else can access controls owned by that handler. | |
73 | */ | |
0996517c HV |
74 | struct v4l2_ctrl_ops { |
75 | int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl); | |
76 | int (*try_ctrl)(struct v4l2_ctrl *ctrl); | |
77 | int (*s_ctrl)(struct v4l2_ctrl *ctrl); | |
78 | }; | |
79 | ||
8c2721d5 MCC |
80 | /** |
81 | * struct v4l2_ctrl_type_ops - The control type operations that the driver | |
8ec4bee7 | 82 | * has to provide. |
8c2721d5 MCC |
83 | * |
84 | * @equal: return true if both values are equal. | |
85 | * @init: initialize the value. | |
86 | * @log: log the value. | |
8ec4bee7 MCC |
87 | * @validate: validate the value. Return 0 on success and a negative value |
88 | * otherwise. | |
8c2721d5 | 89 | */ |
0176077a | 90 | struct v4l2_ctrl_type_ops { |
998e7659 | 91 | bool (*equal)(const struct v4l2_ctrl *ctrl, u32 idx, |
0176077a HV |
92 | union v4l2_ctrl_ptr ptr1, |
93 | union v4l2_ctrl_ptr ptr2); | |
998e7659 | 94 | void (*init)(const struct v4l2_ctrl *ctrl, u32 idx, |
0176077a HV |
95 | union v4l2_ctrl_ptr ptr); |
96 | void (*log)(const struct v4l2_ctrl *ctrl); | |
998e7659 | 97 | int (*validate)(const struct v4l2_ctrl *ctrl, u32 idx, |
0176077a HV |
98 | union v4l2_ctrl_ptr ptr); |
99 | }; | |
100 | ||
2257e180 MCC |
101 | /** |
102 | * typedef v4l2_ctrl_notify_fnc - typedef for a notify argument with a function | |
103 | * that should be called when a control value has changed. | |
104 | * | |
105 | * @ctrl: pointer to struct &v4l2_ctrl | |
106 | * @priv: control private data | |
107 | * | |
108 | * This typedef definition is used as an argument to v4l2_ctrl_notify() | |
109 | * and as an argument at struct &v4l2_ctrl_handler. | |
110 | */ | |
8ac7a949 HV |
111 | typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv); |
112 | ||
8c2721d5 MCC |
113 | /** |
114 | * struct v4l2_ctrl - The control structure. | |
8ec4bee7 | 115 | * |
8c2721d5 MCC |
116 | * @node: The list node. |
117 | * @ev_subs: The list of control event subscriptions. | |
118 | * @handler: The handler that owns the control. | |
119 | * @cluster: Point to start of cluster array. | |
120 | * @ncontrols: Number of controls in cluster array. | |
121 | * @done: Internal flag: set for each processed control. | |
122 | * @is_new: Set when the user specified a new value for this control. It | |
8ec4bee7 | 123 | * is also set when called from v4l2_ctrl_handler_setup(). Drivers |
8c2721d5 MCC |
124 | * should never set this flag. |
125 | * @has_changed: Set when the current value differs from the new value. Drivers | |
126 | * should never use this flag. | |
127 | * @is_private: If set, then this control is private to its handler and it | |
128 | * will not be added to any other handlers. Drivers can set | |
129 | * this flag. | |
130 | * @is_auto: If set, then this control selects whether the other cluster | |
131 | * members are in 'automatic' mode or 'manual' mode. This is | |
132 | * used for autogain/gain type clusters. Drivers should never | |
133 | * set this flag directly. | |
134 | * @is_int: If set, then this control has a simple integer value (i.e. it | |
135 | * uses ctrl->val). | |
8ec4bee7 MCC |
136 | * @is_string: If set, then this control has type %V4L2_CTRL_TYPE_STRING. |
137 | * @is_ptr: If set, then this control is an array and/or has type >= | |
138 | * %V4L2_CTRL_COMPOUND_TYPES | |
139 | * and/or has type %V4L2_CTRL_TYPE_STRING. In other words, &struct | |
8c2721d5 MCC |
140 | * v4l2_ext_control uses field p to point to the data. |
141 | * @is_array: If set, then this control contains an N-dimensional array. | |
142 | * @has_volatiles: If set, then one or more members of the cluster are volatile. | |
143 | * Drivers should never touch this flag. | |
144 | * @call_notify: If set, then call the handler's notify function whenever the | |
145 | * control's value changes. | |
146 | * @manual_mode_value: If the is_auto flag is set, then this is the value | |
147 | * of the auto control that determines if that control is in | |
148 | * manual mode. So if the value of the auto control equals this | |
149 | * value, then the whole cluster is in manual mode. Drivers should | |
150 | * never set this flag directly. | |
151 | * @ops: The control ops. | |
152 | * @type_ops: The control type ops. | |
153 | * @id: The control ID. | |
154 | * @name: The control name. | |
155 | * @type: The control type. | |
156 | * @minimum: The control's minimum value. | |
157 | * @maximum: The control's maximum value. | |
158 | * @default_value: The control's default value. | |
159 | * @step: The control's step value for non-menu controls. | |
160 | * @elems: The number of elements in the N-dimensional array. | |
161 | * @elem_size: The size in bytes of the control. | |
162 | * @dims: The size of each dimension. | |
163 | * @nr_of_dims:The number of dimensions in @dims. | |
164 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it | |
165 | * easy to skip menu items that are not valid. If bit X is set, | |
166 | * then menu item X is skipped. Of course, this only works for | |
167 | * menus with <= 32 menu items. There are no menus that come | |
168 | * close to that number, so this is OK. Should we ever need more, | |
169 | * then this will have to be extended to a u64 or a bit array. | |
170 | * @qmenu: A const char * array for all menu items. Array entries that are | |
171 | * empty strings ("") correspond to non-existing menu items (this | |
172 | * is in addition to the menu_skip_mask above). The last entry | |
173 | * must be NULL. | |
20139f18 MCC |
174 | * Used only if the @type is %V4L2_CTRL_TYPE_MENU. |
175 | * @qmenu_int: A 64-bit integer array for with integer menu items. | |
176 | * The size of array must be equal to the menu size, e. g.: | |
177 | * :math:`ceil(\frac{maximum - minimum}{step}) + 1`. | |
178 | * Used only if the @type is %V4L2_CTRL_TYPE_INTEGER_MENU. | |
8c2721d5 | 179 | * @flags: The control's flags. |
20139f18 MCC |
180 | * @cur: Structure to store the current value. |
181 | * @cur.val: The control's current value, if the @type is represented via | |
182 | * a u32 integer (see &enum v4l2_ctrl_type). | |
8c2721d5 | 183 | * @val: The control's new s32 value. |
8c2721d5 MCC |
184 | * @priv: The control's private pointer. For use by the driver. It is |
185 | * untouched by the control framework. Note that this pointer is | |
186 | * not freed when the control is deleted. Should this be needed | |
187 | * then a new internal bitfield can be added to tell the framework | |
188 | * to free this pointer. | |
bf7b7048 | 189 | * @p_cur: The control's current value represented via a union which |
7dc87919 MCC |
190 | * provides a standard way of accessing control types |
191 | * through a pointer. | |
bf7b7048 | 192 | * @p_new: The control's new value represented via a union which provides |
7dc87919 MCC |
193 | * a standard way of accessing control types |
194 | * through a pointer. | |
8c2721d5 | 195 | */ |
0996517c HV |
196 | struct v4l2_ctrl { |
197 | /* Administrative fields */ | |
198 | struct list_head node; | |
77068d36 | 199 | struct list_head ev_subs; |
0996517c HV |
200 | struct v4l2_ctrl_handler *handler; |
201 | struct v4l2_ctrl **cluster; | |
8ec4bee7 MCC |
202 | unsigned int ncontrols; |
203 | ||
0996517c HV |
204 | unsigned int done:1; |
205 | ||
2a863793 | 206 | unsigned int is_new:1; |
9ea1b7a4 | 207 | unsigned int has_changed:1; |
0996517c | 208 | unsigned int is_private:1; |
72d877ca | 209 | unsigned int is_auto:1; |
d9a25471 HV |
210 | unsigned int is_int:1; |
211 | unsigned int is_string:1; | |
212 | unsigned int is_ptr:1; | |
998e7659 | 213 | unsigned int is_array:1; |
5626b8c7 | 214 | unsigned int has_volatiles:1; |
8ac7a949 | 215 | unsigned int call_notify:1; |
82a7c049 | 216 | unsigned int manual_mode_value:8; |
0996517c HV |
217 | |
218 | const struct v4l2_ctrl_ops *ops; | |
0176077a | 219 | const struct v4l2_ctrl_type_ops *type_ops; |
0996517c HV |
220 | u32 id; |
221 | const char *name; | |
222 | enum v4l2_ctrl_type type; | |
0ba2aeb6 | 223 | s64 minimum, maximum, default_value; |
20d88eef | 224 | u32 elems; |
d9a25471 | 225 | u32 elem_size; |
20d88eef HV |
226 | u32 dims[V4L2_CTRL_MAX_DIMS]; |
227 | u32 nr_of_dims; | |
0996517c | 228 | union { |
0ba2aeb6 HV |
229 | u64 step; |
230 | u64 menu_skip_mask; | |
0996517c | 231 | }; |
ce580fe5 SA |
232 | union { |
233 | const char * const *qmenu; | |
234 | const s64 *qmenu_int; | |
235 | }; | |
0996517c | 236 | unsigned long flags; |
d9a25471 | 237 | void *priv; |
2a9ec373 HV |
238 | s32 val; |
239 | struct { | |
0996517c | 240 | s32 val; |
d9a25471 | 241 | } cur; |
0176077a HV |
242 | |
243 | union v4l2_ctrl_ptr p_new; | |
244 | union v4l2_ctrl_ptr p_cur; | |
0996517c HV |
245 | }; |
246 | ||
8c2721d5 MCC |
247 | /** |
248 | * struct v4l2_ctrl_ref - The control reference. | |
8ec4bee7 | 249 | * |
8c2721d5 MCC |
250 | * @node: List node for the sorted list. |
251 | * @next: Single-link list node for the hash. | |
252 | * @ctrl: The actual control information. | |
8ec4bee7 | 253 | * @helper: Pointer to helper struct. Used internally in |
fb91161a | 254 | * ``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``. |
da1b1aea HV |
255 | * @from_other_dev: If true, then @ctrl was defined in another |
256 | * device than the &struct v4l2_ctrl_handler. | |
6fa6f831 HV |
257 | * @req_done: Internal flag: if the control handler containing this control |
258 | * reference is bound to a media request, then this is set when | |
259 | * the control has been applied. This prevents applying controls | |
260 | * from a cluster with multiple controls twice (when the first | |
261 | * control of a cluster is applied, they all are). | |
262 | * @req: If set, this refers to another request that sets this control. | |
52beeddb HV |
263 | * @p_req: If the control handler containing this control reference |
264 | * is bound to a media request, then this points to the | |
265 | * value of the control that should be applied when the request | |
266 | * is executed, or to the value of the control at the time | |
267 | * that the request was completed. | |
8c2721d5 MCC |
268 | * |
269 | * Each control handler has a list of these refs. The list_head is used to | |
270 | * keep a sorted-by-control-ID list of all controls, while the next pointer | |
271 | * is used to link the control in the hash's bucket. | |
272 | */ | |
0996517c HV |
273 | struct v4l2_ctrl_ref { |
274 | struct list_head node; | |
275 | struct v4l2_ctrl_ref *next; | |
276 | struct v4l2_ctrl *ctrl; | |
eb5b16ef | 277 | struct v4l2_ctrl_helper *helper; |
da1b1aea | 278 | bool from_other_dev; |
6fa6f831 HV |
279 | bool req_done; |
280 | struct v4l2_ctrl_ref *req; | |
52beeddb | 281 | union v4l2_ctrl_ptr p_req; |
0996517c HV |
282 | }; |
283 | ||
8c2721d5 MCC |
284 | /** |
285 | * struct v4l2_ctrl_handler - The control handler keeps track of all the | |
8ec4bee7 MCC |
286 | * controls: both the controls owned by the handler and those inherited |
287 | * from other handlers. | |
288 | * | |
8c2721d5 MCC |
289 | * @_lock: Default for "lock". |
290 | * @lock: Lock to control access to this handler and its controls. | |
291 | * May be replaced by the user right after init. | |
292 | * @ctrls: The list of controls owned by this handler. | |
293 | * @ctrl_refs: The list of control references. | |
294 | * @cached: The last found control reference. It is common that the same | |
295 | * control is needed multiple times, so this is a simple | |
296 | * optimization. | |
297 | * @buckets: Buckets for the hashing. Allows for quick control lookup. | |
8ec4bee7 MCC |
298 | * @notify: A notify callback that is called whenever the control changes |
299 | * value. | |
8c2721d5 MCC |
300 | * Note that the handler's lock is held when the notify function |
301 | * is called! | |
302 | * @notify_priv: Passed as argument to the v4l2_ctrl notify callback. | |
303 | * @nr_of_buckets: Total number of buckets in the array. | |
304 | * @error: The error code of the first failed control addition. | |
6fa6f831 HV |
305 | * @request_is_queued: True if the request was queued. |
306 | * @requests: List to keep track of open control handler request objects. | |
307 | * For the parent control handler (@req_obj.req == NULL) this | |
308 | * is the list header. When the parent control handler is | |
309 | * removed, it has to unbind and put all these requests since | |
310 | * they refer to the parent. | |
311 | * @requests_queued: List of the queued requests. This determines the order | |
312 | * in which these controls are applied. Once the request is | |
313 | * completed it is removed from this list. | |
52beeddb HV |
314 | * @req_obj: The &struct media_request_object, used to link into a |
315 | * &struct media_request. This request object has a refcount. | |
8c2721d5 | 316 | */ |
0996517c | 317 | struct v4l2_ctrl_handler { |
77e7c4e6 SA |
318 | struct mutex _lock; |
319 | struct mutex *lock; | |
0996517c HV |
320 | struct list_head ctrls; |
321 | struct list_head ctrl_refs; | |
322 | struct v4l2_ctrl_ref *cached; | |
323 | struct v4l2_ctrl_ref **buckets; | |
8ac7a949 HV |
324 | v4l2_ctrl_notify_fnc notify; |
325 | void *notify_priv; | |
0996517c HV |
326 | u16 nr_of_buckets; |
327 | int error; | |
6fa6f831 HV |
328 | bool request_is_queued; |
329 | struct list_head requests; | |
330 | struct list_head requests_queued; | |
52beeddb | 331 | struct media_request_object req_obj; |
0996517c HV |
332 | }; |
333 | ||
8c2721d5 MCC |
334 | /** |
335 | * struct v4l2_ctrl_config - Control configuration structure. | |
8ec4bee7 | 336 | * |
8c2721d5 MCC |
337 | * @ops: The control ops. |
338 | * @type_ops: The control type ops. Only needed for compound controls. | |
339 | * @id: The control ID. | |
340 | * @name: The control name. | |
341 | * @type: The control type. | |
342 | * @min: The control's minimum value. | |
343 | * @max: The control's maximum value. | |
344 | * @step: The control's step value for non-menu controls. | |
8ec4bee7 | 345 | * @def: The control's default value. |
8c2721d5 MCC |
346 | * @dims: The size of each dimension. |
347 | * @elem_size: The size in bytes of the control. | |
348 | * @flags: The control's flags. | |
349 | * @menu_skip_mask: The control's skip mask for menu controls. This makes it | |
350 | * easy to skip menu items that are not valid. If bit X is set, | |
351 | * then menu item X is skipped. Of course, this only works for | |
352 | * menus with <= 64 menu items. There are no menus that come | |
353 | * close to that number, so this is OK. Should we ever need more, | |
354 | * then this will have to be extended to a bit array. | |
355 | * @qmenu: A const char * array for all menu items. Array entries that are | |
356 | * empty strings ("") correspond to non-existing menu items (this | |
357 | * is in addition to the menu_skip_mask above). The last entry | |
358 | * must be NULL. | |
7dc87919 | 359 | * @qmenu_int: A const s64 integer array for all menu items of the type |
8ec4bee7 | 360 | * V4L2_CTRL_TYPE_INTEGER_MENU. |
8c2721d5 MCC |
361 | * @is_private: If set, then this control is private to its handler and it |
362 | * will not be added to any other handlers. | |
363 | */ | |
0996517c HV |
364 | struct v4l2_ctrl_config { |
365 | const struct v4l2_ctrl_ops *ops; | |
0176077a | 366 | const struct v4l2_ctrl_type_ops *type_ops; |
0996517c HV |
367 | u32 id; |
368 | const char *name; | |
369 | enum v4l2_ctrl_type type; | |
0ba2aeb6 HV |
370 | s64 min; |
371 | s64 max; | |
372 | u64 step; | |
373 | s64 def; | |
20d88eef | 374 | u32 dims[V4L2_CTRL_MAX_DIMS]; |
d9a25471 | 375 | u32 elem_size; |
0996517c | 376 | u32 flags; |
0ba2aeb6 | 377 | u64 menu_skip_mask; |
513521ea | 378 | const char * const *qmenu; |
ce580fe5 | 379 | const s64 *qmenu_int; |
0996517c | 380 | unsigned int is_private:1; |
0996517c HV |
381 | }; |
382 | ||
8ec4bee7 MCC |
383 | /** |
384 | * v4l2_ctrl_fill - Fill in the control fields based on the control ID. | |
385 | * | |
386 | * @id: ID of the control | |
67c672ec MCC |
387 | * @name: pointer to be filled with a string with the name of the control |
388 | * @type: pointer for storing the type of the control | |
389 | * @min: pointer for storing the minimum value for the control | |
390 | * @max: pointer for storing the maximum value for the control | |
391 | * @step: pointer for storing the control step | |
392 | * @def: pointer for storing the default value for the control | |
393 | * @flags: pointer for storing the flags to be used on the control | |
8c2721d5 MCC |
394 | * |
395 | * This works for all standard V4L2 controls. | |
396 | * For non-standard controls it will only fill in the given arguments | |
67c672ec | 397 | * and @name content will be set to %NULL. |
8c2721d5 MCC |
398 | * |
399 | * This function will overwrite the contents of @name, @type and @flags. | |
400 | * The contents of @min, @max, @step and @def may be modified depending on | |
401 | * the type. | |
402 | * | |
8ec4bee7 MCC |
403 | * .. note:: |
404 | * | |
405 | * Do not use in drivers! It is used internally for backwards compatibility | |
406 | * control handling only. Once all drivers are converted to use the new | |
407 | * control framework this function will no longer be exported. | |
8c2721d5 | 408 | */ |
0996517c | 409 | void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, |
0ba2aeb6 | 410 | s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags); |
0996517c HV |
411 | |
412 | ||
8c2721d5 MCC |
413 | /** |
414 | * v4l2_ctrl_handler_init_class() - Initialize the control handler. | |
415 | * @hdl: The control handler. | |
416 | * @nr_of_controls_hint: A hint of how many controls this handler is | |
417 | * expected to refer to. This is the total number, so including | |
418 | * any inherited controls. It doesn't have to be precise, but if | |
419 | * it is way off, then you either waste memory (too many buckets | |
420 | * are allocated) or the control lookup becomes slower (not enough | |
421 | * buckets are allocated, so there are more slow list lookups). | |
422 | * It will always work, though. | |
423 | * @key: Used by the lock validator if CONFIG_LOCKDEP is set. | |
424 | * @name: Used by the lock validator if CONFIG_LOCKDEP is set. | |
425 | * | |
2257e180 MCC |
426 | * .. attention:: |
427 | * | |
428 | * Never use this call directly, always use the v4l2_ctrl_handler_init() | |
429 | * macro that hides the @key and @name arguments. | |
8c2721d5 | 430 | * |
2257e180 MCC |
431 | * Return: returns an error if the buckets could not be allocated. This |
432 | * error will also be stored in @hdl->error. | |
8c2721d5 | 433 | */ |
6cd247ef | 434 | int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 | 435 | unsigned int nr_of_controls_hint, |
6cd247ef AW |
436 | struct lock_class_key *key, const char *name); |
437 | ||
438 | #ifdef CONFIG_LOCKDEP | |
2257e180 MCC |
439 | |
440 | /** | |
e383ce07 MCC |
441 | * v4l2_ctrl_handler_init - helper function to create a static struct |
442 | * &lock_class_key and calls v4l2_ctrl_handler_init_class() | |
2257e180 MCC |
443 | * |
444 | * @hdl: The control handler. | |
445 | * @nr_of_controls_hint: A hint of how many controls this handler is | |
446 | * expected to refer to. This is the total number, so including | |
447 | * any inherited controls. It doesn't have to be precise, but if | |
448 | * it is way off, then you either waste memory (too many buckets | |
449 | * are allocated) or the control lookup becomes slower (not enough | |
450 | * buckets are allocated, so there are more slow list lookups). | |
451 | * It will always work, though. | |
452 | * | |
453 | * This helper function creates a static struct &lock_class_key and | |
454 | * calls v4l2_ctrl_handler_init_class(), providing a proper name for the lock | |
455 | * validador. | |
456 | * | |
457 | * Use this helper function to initialize a control handler. | |
458 | */ | |
6cd247ef AW |
459 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ |
460 | ( \ | |
461 | ({ \ | |
462 | static struct lock_class_key _key; \ | |
463 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, \ | |
464 | &_key, \ | |
465 | KBUILD_BASENAME ":" \ | |
466 | __stringify(__LINE__) ":" \ | |
467 | "(" #hdl ")->_lock"); \ | |
468 | }) \ | |
469 | ) | |
470 | #else | |
471 | #define v4l2_ctrl_handler_init(hdl, nr_of_controls_hint) \ | |
472 | v4l2_ctrl_handler_init_class(hdl, nr_of_controls_hint, NULL, NULL) | |
473 | #endif | |
0996517c | 474 | |
8c2721d5 MCC |
475 | /** |
476 | * v4l2_ctrl_handler_free() - Free all controls owned by the handler and free | |
477 | * the control list. | |
478 | * @hdl: The control handler. | |
479 | * | |
480 | * Does nothing if @hdl == NULL. | |
481 | */ | |
0996517c HV |
482 | void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl); |
483 | ||
8c2721d5 MCC |
484 | /** |
485 | * v4l2_ctrl_lock() - Helper function to lock the handler | |
486 | * associated with the control. | |
487 | * @ctrl: The control to lock. | |
488 | */ | |
605b3840 SA |
489 | static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) |
490 | { | |
491 | mutex_lock(ctrl->handler->lock); | |
492 | } | |
493 | ||
8c2721d5 MCC |
494 | /** |
495 | * v4l2_ctrl_unlock() - Helper function to unlock the handler | |
496 | * associated with the control. | |
497 | * @ctrl: The control to unlock. | |
498 | */ | |
605b3840 SA |
499 | static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) |
500 | { | |
501 | mutex_unlock(ctrl->handler->lock); | |
502 | } | |
503 | ||
cc0140e2 SA |
504 | /** |
505 | * __v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging | |
506 | * to the handler to initialize the hardware to the current control values. The | |
507 | * caller is responsible for acquiring the control handler mutex on behalf of | |
508 | * __v4l2_ctrl_handler_setup(). | |
509 | * @hdl: The control handler. | |
510 | * | |
511 | * Button controls will be skipped, as are read-only controls. | |
512 | * | |
513 | * If @hdl == NULL, then this just returns 0. | |
514 | */ | |
515 | int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); | |
516 | ||
8c2721d5 MCC |
517 | /** |
518 | * v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging | |
519 | * to the handler to initialize the hardware to the current control values. | |
520 | * @hdl: The control handler. | |
521 | * | |
522 | * Button controls will be skipped, as are read-only controls. | |
523 | * | |
524 | * If @hdl == NULL, then this just returns 0. | |
525 | */ | |
0996517c HV |
526 | int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl); |
527 | ||
8c2721d5 MCC |
528 | /** |
529 | * v4l2_ctrl_handler_log_status() - Log all controls owned by the handler. | |
530 | * @hdl: The control handler. | |
531 | * @prefix: The prefix to use when logging the control values. If the | |
532 | * prefix does not end with a space, then ": " will be added | |
533 | * after the prefix. If @prefix == NULL, then no prefix will be | |
534 | * used. | |
535 | * | |
536 | * For use with VIDIOC_LOG_STATUS. | |
537 | * | |
538 | * Does nothing if @hdl == NULL. | |
539 | */ | |
0996517c HV |
540 | void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl, |
541 | const char *prefix); | |
542 | ||
8c2721d5 MCC |
543 | /** |
544 | * v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2 | |
8ec4bee7 MCC |
545 | * control. |
546 | * | |
8c2721d5 MCC |
547 | * @hdl: The control handler. |
548 | * @cfg: The control's configuration data. | |
549 | * @priv: The control's driver-specific private data. | |
550 | * | |
551 | * If the &v4l2_ctrl struct could not be allocated then NULL is returned | |
552 | * and @hdl->error is set to the error code (if it wasn't set already). | |
553 | */ | |
0996517c | 554 | struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
555 | const struct v4l2_ctrl_config *cfg, |
556 | void *priv); | |
0996517c | 557 | |
8c2721d5 | 558 | /** |
8ec4bee7 MCC |
559 | * v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 non-menu |
560 | * control. | |
561 | * | |
8c2721d5 MCC |
562 | * @hdl: The control handler. |
563 | * @ops: The control ops. | |
8ec4bee7 | 564 | * @id: The control ID. |
8c2721d5 MCC |
565 | * @min: The control's minimum value. |
566 | * @max: The control's maximum value. | |
567 | * @step: The control's step value | |
8ec4bee7 | 568 | * @def: The control's default value. |
8c2721d5 MCC |
569 | * |
570 | * If the &v4l2_ctrl struct could not be allocated, or the control | |
571 | * ID is not known, then NULL is returned and @hdl->error is set to the | |
572 | * appropriate error code (if it wasn't set already). | |
573 | * | |
574 | * If @id refers to a menu control, then this function will return NULL. | |
575 | * | |
576 | * Use v4l2_ctrl_new_std_menu() when adding menu controls. | |
577 | */ | |
0996517c | 578 | struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
579 | const struct v4l2_ctrl_ops *ops, |
580 | u32 id, s64 min, s64 max, u64 step, | |
581 | s64 def); | |
0996517c | 582 | |
8c2721d5 | 583 | /** |
8ec4bee7 MCC |
584 | * v4l2_ctrl_new_std_menu() - Allocate and initialize a new standard V4L2 |
585 | * menu control. | |
586 | * | |
8c2721d5 MCC |
587 | * @hdl: The control handler. |
588 | * @ops: The control ops. | |
8ec4bee7 | 589 | * @id: The control ID. |
8c2721d5 | 590 | * @max: The control's maximum value. |
8ec4bee7 | 591 | * @mask: The control's skip mask for menu controls. This makes it |
8c2721d5 MCC |
592 | * easy to skip menu items that are not valid. If bit X is set, |
593 | * then menu item X is skipped. Of course, this only works for | |
594 | * menus with <= 64 menu items. There are no menus that come | |
595 | * close to that number, so this is OK. Should we ever need more, | |
596 | * then this will have to be extended to a bit array. | |
8ec4bee7 | 597 | * @def: The control's default value. |
8c2721d5 MCC |
598 | * |
599 | * Same as v4l2_ctrl_new_std(), but @min is set to 0 and the @mask value | |
600 | * determines which menu items are to be skipped. | |
601 | * | |
602 | * If @id refers to a non-menu control, then this function will return NULL. | |
603 | */ | |
0996517c | 604 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
605 | const struct v4l2_ctrl_ops *ops, |
606 | u32 id, u8 max, u64 mask, u8 def); | |
0996517c | 607 | |
8c2721d5 MCC |
608 | /** |
609 | * v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control | |
8ec4bee7 MCC |
610 | * with driver specific menu. |
611 | * | |
8c2721d5 MCC |
612 | * @hdl: The control handler. |
613 | * @ops: The control ops. | |
614 | * @id: The control ID. | |
615 | * @max: The control's maximum value. | |
616 | * @mask: The control's skip mask for menu controls. This makes it | |
617 | * easy to skip menu items that are not valid. If bit X is set, | |
618 | * then menu item X is skipped. Of course, this only works for | |
619 | * menus with <= 64 menu items. There are no menus that come | |
620 | * close to that number, so this is OK. Should we ever need more, | |
621 | * then this will have to be extended to a bit array. | |
622 | * @def: The control's default value. | |
623 | * @qmenu: The new menu. | |
624 | * | |
625 | * Same as v4l2_ctrl_new_std_menu(), but @qmenu will be the driver specific | |
626 | * menu of this control. | |
627 | * | |
628 | */ | |
117a711a | 629 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
630 | const struct v4l2_ctrl_ops *ops, |
631 | u32 id, u8 max, | |
632 | u64 mask, u8 def, | |
633 | const char * const *qmenu); | |
117a711a | 634 | |
8c2721d5 MCC |
635 | /** |
636 | * v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. | |
8ec4bee7 | 637 | * |
8c2721d5 MCC |
638 | * @hdl: The control handler. |
639 | * @ops: The control ops. | |
640 | * @id: The control ID. | |
641 | * @max: The control's maximum value. | |
642 | * @def: The control's default value. | |
643 | * @qmenu_int: The control's menu entries. | |
644 | * | |
645 | * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly | |
646 | * takes as an argument an array of integers determining the menu items. | |
647 | * | |
8ec4bee7 MCC |
648 | * If @id refers to a non-integer-menu control, then this function will |
649 | * return %NULL. | |
8c2721d5 | 650 | */ |
515f3287 | 651 | struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
652 | const struct v4l2_ctrl_ops *ops, |
653 | u32 id, u8 max, u8 def, | |
654 | const s64 *qmenu_int); | |
515f3287 | 655 | |
2257e180 MCC |
656 | /** |
657 | * typedef v4l2_ctrl_filter - Typedef to define the filter function to be | |
658 | * used when adding a control handler. | |
659 | * | |
660 | * @ctrl: pointer to struct &v4l2_ctrl. | |
661 | */ | |
662 | ||
6d85d7d7 MCC |
663 | typedef bool (*v4l2_ctrl_filter)(const struct v4l2_ctrl *ctrl); |
664 | ||
8c2721d5 MCC |
665 | /** |
666 | * v4l2_ctrl_add_handler() - Add all controls from handler @add to | |
8ec4bee7 MCC |
667 | * handler @hdl. |
668 | * | |
8c2721d5 MCC |
669 | * @hdl: The control handler. |
670 | * @add: The control handler whose controls you want to add to | |
671 | * the @hdl control handler. | |
672 | * @filter: This function will filter which controls should be added. | |
da1b1aea HV |
673 | * @from_other_dev: If true, then the controls in @add were defined in another |
674 | * device than @hdl. | |
8c2721d5 MCC |
675 | * |
676 | * Does nothing if either of the two handlers is a NULL pointer. | |
677 | * If @filter is NULL, then all controls are added. Otherwise only those | |
678 | * controls for which @filter returns true will be added. | |
679 | * In case of an error @hdl->error will be set to the error code (if it | |
680 | * wasn't set already). | |
681 | */ | |
0996517c | 682 | int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, |
34a6b7d0 | 683 | struct v4l2_ctrl_handler *add, |
da1b1aea HV |
684 | v4l2_ctrl_filter filter, |
685 | bool from_other_dev); | |
0996517c | 686 | |
8c2721d5 MCC |
687 | /** |
688 | * v4l2_ctrl_radio_filter() - Standard filter for radio controls. | |
8ec4bee7 | 689 | * |
8c2721d5 MCC |
690 | * @ctrl: The control that is filtered. |
691 | * | |
692 | * This will return true for any controls that are valid for radio device | |
693 | * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM | |
694 | * transmitter class controls. | |
695 | * | |
696 | * This function is to be used with v4l2_ctrl_add_handler(). | |
697 | */ | |
34a6b7d0 | 698 | bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl); |
0996517c | 699 | |
8c2721d5 | 700 | /** |
8ec4bee7 MCC |
701 | * v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging |
702 | * to that cluster. | |
703 | * | |
8c2721d5 | 704 | * @ncontrols: The number of controls in this cluster. |
8ec4bee7 | 705 | * @controls: The cluster control array of size @ncontrols. |
8c2721d5 | 706 | */ |
8ec4bee7 | 707 | void v4l2_ctrl_cluster(unsigned int ncontrols, struct v4l2_ctrl **controls); |
0996517c HV |
708 | |
709 | ||
8c2721d5 | 710 | /** |
8ec4bee7 MCC |
711 | * v4l2_ctrl_auto_cluster() - Mark all controls in the cluster as belonging |
712 | * to that cluster and set it up for autofoo/foo-type handling. | |
713 | * | |
8c2721d5 MCC |
714 | * @ncontrols: The number of controls in this cluster. |
715 | * @controls: The cluster control array of size @ncontrols. The first control | |
716 | * must be the 'auto' control (e.g. autogain, autoexposure, etc.) | |
717 | * @manual_val: The value for the first control in the cluster that equals the | |
718 | * manual setting. | |
719 | * @set_volatile: If true, then all controls except the first auto control will | |
720 | * be volatile. | |
721 | * | |
722 | * Use for control groups where one control selects some automatic feature and | |
723 | * the other controls are only active whenever the automatic feature is turned | |
724 | * off (manual mode). Typical examples: autogain vs gain, auto-whitebalance vs | |
725 | * red and blue balance, etc. | |
726 | * | |
727 | * The behavior of such controls is as follows: | |
728 | * | |
729 | * When the autofoo control is set to automatic, then any manual controls | |
730 | * are set to inactive and any reads will call g_volatile_ctrl (if the control | |
731 | * was marked volatile). | |
732 | * | |
733 | * When the autofoo control is set to manual, then any manual controls will | |
734 | * be marked active, and any reads will just return the current value without | |
735 | * going through g_volatile_ctrl. | |
736 | * | |
2257e180 MCC |
737 | * In addition, this function will set the %V4L2_CTRL_FLAG_UPDATE flag |
738 | * on the autofoo control and %V4L2_CTRL_FLAG_INACTIVE on the foo control(s) | |
8c2721d5 MCC |
739 | * if autofoo is in auto mode. |
740 | */ | |
8ec4bee7 MCC |
741 | void v4l2_ctrl_auto_cluster(unsigned int ncontrols, |
742 | struct v4l2_ctrl **controls, | |
743 | u8 manual_val, bool set_volatile); | |
72d877ca HV |
744 | |
745 | ||
8c2721d5 MCC |
746 | /** |
747 | * v4l2_ctrl_find() - Find a control with the given ID. | |
8ec4bee7 | 748 | * |
8c2721d5 MCC |
749 | * @hdl: The control handler. |
750 | * @id: The control ID to find. | |
751 | * | |
752 | * If @hdl == NULL this will return NULL as well. Will lock the handler so | |
753 | * do not use from inside &v4l2_ctrl_ops. | |
754 | */ | |
0996517c HV |
755 | struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); |
756 | ||
8c2721d5 MCC |
757 | /** |
758 | * v4l2_ctrl_activate() - Make the control active or inactive. | |
759 | * @ctrl: The control to (de)activate. | |
760 | * @active: True if the control should become active. | |
761 | * | |
762 | * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically. | |
763 | * Does nothing if @ctrl == NULL. | |
764 | * This will usually be called from within the s_ctrl op. | |
765 | * The V4L2_EVENT_CTRL event will be generated afterwards. | |
766 | * | |
767 | * This function assumes that the control handler is locked. | |
768 | */ | |
0996517c HV |
769 | void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active); |
770 | ||
7a9b109d SA |
771 | /** |
772 | * __v4l2_ctrl_grab() - Unlocked variant of v4l2_ctrl_grab. | |
773 | * | |
774 | * @ctrl: The control to (de)activate. | |
775 | * @grabbed: True if the control should become grabbed. | |
776 | * | |
777 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. | |
778 | * Does nothing if @ctrl == NULL. | |
779 | * The V4L2_EVENT_CTRL event will be generated afterwards. | |
780 | * This will usually be called when starting or stopping streaming in the | |
781 | * driver. | |
782 | * | |
783 | * This function assumes that the control handler is locked by the caller. | |
784 | */ | |
785 | void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed); | |
786 | ||
8c2721d5 MCC |
787 | /** |
788 | * v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed. | |
8ec4bee7 | 789 | * |
8c2721d5 MCC |
790 | * @ctrl: The control to (de)activate. |
791 | * @grabbed: True if the control should become grabbed. | |
792 | * | |
793 | * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically. | |
794 | * Does nothing if @ctrl == NULL. | |
795 | * The V4L2_EVENT_CTRL event will be generated afterwards. | |
796 | * This will usually be called when starting or stopping streaming in the | |
797 | * driver. | |
798 | * | |
799 | * This function assumes that the control handler is not locked and will | |
800 | * take the lock itself. | |
801 | */ | |
7a9b109d SA |
802 | static inline void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed) |
803 | { | |
804 | if (!ctrl) | |
805 | return; | |
806 | ||
807 | v4l2_ctrl_lock(ctrl); | |
808 | __v4l2_ctrl_grab(ctrl, grabbed); | |
809 | v4l2_ctrl_unlock(ctrl); | |
810 | } | |
0996517c | 811 | |
8c2721d5 MCC |
812 | /** |
813 | *__v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range() | |
814 | * | |
815 | * @ctrl: The control to update. | |
816 | * @min: The control's minimum value. | |
817 | * @max: The control's maximum value. | |
818 | * @step: The control's step value | |
819 | * @def: The control's default value. | |
820 | * | |
821 | * Update the range of a control on the fly. This works for control types | |
822 | * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the | |
823 | * @step value is interpreted as a menu_skip_mask. | |
824 | * | |
825 | * An error is returned if one of the range arguments is invalid for this | |
826 | * control type. | |
827 | * | |
97eee23a HV |
828 | * The caller is responsible for acquiring the control handler mutex on behalf |
829 | * of __v4l2_ctrl_modify_range(). | |
8c2721d5 | 830 | */ |
5a573925 SA |
831 | int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, |
832 | s64 min, s64 max, u64 step, s64 def); | |
833 | ||
8c2721d5 MCC |
834 | /** |
835 | * v4l2_ctrl_modify_range() - Update the range of a control. | |
8ec4bee7 | 836 | * |
8c2721d5 MCC |
837 | * @ctrl: The control to update. |
838 | * @min: The control's minimum value. | |
839 | * @max: The control's maximum value. | |
840 | * @step: The control's step value | |
841 | * @def: The control's default value. | |
842 | * | |
843 | * Update the range of a control on the fly. This works for control types | |
844 | * INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the | |
845 | * @step value is interpreted as a menu_skip_mask. | |
846 | * | |
847 | * An error is returned if one of the range arguments is invalid for this | |
848 | * control type. | |
849 | * | |
850 | * This function assumes that the control handler is not locked and will | |
851 | * take the lock itself. | |
852 | */ | |
5a573925 SA |
853 | static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl, |
854 | s64 min, s64 max, u64 step, s64 def) | |
855 | { | |
856 | int rval; | |
857 | ||
858 | v4l2_ctrl_lock(ctrl); | |
859 | rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def); | |
860 | v4l2_ctrl_unlock(ctrl); | |
861 | ||
862 | return rval; | |
863 | } | |
2ccbe779 | 864 | |
8c2721d5 MCC |
865 | /** |
866 | * v4l2_ctrl_notify() - Function to set a notify callback for a control. | |
8ec4bee7 | 867 | * |
8c2721d5 MCC |
868 | * @ctrl: The control. |
869 | * @notify: The callback function. | |
870 | * @priv: The callback private handle, passed as argument to the callback. | |
871 | * | |
872 | * This function sets a callback function for the control. If @ctrl is NULL, | |
873 | * then it will do nothing. If @notify is NULL, then the notify callback will | |
874 | * be removed. | |
875 | * | |
876 | * There can be only one notify. If another already exists, then a WARN_ON | |
877 | * will be issued and the function will do nothing. | |
878 | */ | |
8ec4bee7 MCC |
879 | void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, |
880 | void *priv); | |
8ac7a949 | 881 | |
8c2721d5 MCC |
882 | /** |
883 | * v4l2_ctrl_get_name() - Get the name of the control | |
8ec4bee7 | 884 | * |
79fbc209 HV |
885 | * @id: The control ID. |
886 | * | |
887 | * This function returns the name of the given control ID or NULL if it isn't | |
888 | * a known control. | |
889 | */ | |
890 | const char *v4l2_ctrl_get_name(u32 id); | |
891 | ||
8c2721d5 MCC |
892 | /** |
893 | * v4l2_ctrl_get_menu() - Get the menu string array of the control | |
8ec4bee7 | 894 | * |
79fbc209 HV |
895 | * @id: The control ID. |
896 | * | |
897 | * This function returns the NULL-terminated menu string array name of the | |
898 | * given control ID or NULL if it isn't a known menu control. | |
899 | */ | |
900 | const char * const *v4l2_ctrl_get_menu(u32 id); | |
901 | ||
8c2721d5 MCC |
902 | /** |
903 | * v4l2_ctrl_get_int_menu() - Get the integer menu array of the control | |
8ec4bee7 | 904 | * |
79fbc209 HV |
905 | * @id: The control ID. |
906 | * @len: The size of the integer array. | |
907 | * | |
908 | * This function returns the integer array of the given control ID or NULL if it | |
909 | * if it isn't a known integer menu control. | |
910 | */ | |
911 | const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len); | |
912 | ||
8c2721d5 | 913 | /** |
8ec4bee7 MCC |
914 | * v4l2_ctrl_g_ctrl() - Helper function to get the control's value from |
915 | * within a driver. | |
916 | * | |
8c2721d5 MCC |
917 | * @ctrl: The control. |
918 | * | |
919 | * This returns the control's value safely by going through the control | |
920 | * framework. This function will lock the control's handler, so it cannot be | |
921 | * used from within the &v4l2_ctrl_ops functions. | |
922 | * | |
923 | * This function is for integer type controls only. | |
924 | */ | |
0996517c HV |
925 | s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl); |
926 | ||
8c2721d5 MCC |
927 | /** |
928 | * __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl(). | |
8ec4bee7 | 929 | * |
8c2721d5 | 930 | * @ctrl: The control. |
8ec4bee7 | 931 | * @val: TheControls name new value. |
8c2721d5 | 932 | * |
904aef0f HV |
933 | * This sets the control's new value safely by going through the control |
934 | * framework. This function assumes the control's handler is already locked, | |
935 | * allowing it to be used from within the &v4l2_ctrl_ops functions. | |
8c2721d5 MCC |
936 | * |
937 | * This function is for integer type controls only. | |
938 | */ | |
0c4348ad | 939 | int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val); |
8c2721d5 | 940 | |
8ec4bee7 MCC |
941 | /** |
942 | * v4l2_ctrl_s_ctrl() - Helper function to set the control's value from | |
943 | * within a driver. | |
8c2721d5 MCC |
944 | * @ctrl: The control. |
945 | * @val: The new value. | |
946 | * | |
904aef0f | 947 | * This sets the control's new value safely by going through the control |
8c2721d5 MCC |
948 | * framework. This function will lock the control's handler, so it cannot be |
949 | * used from within the &v4l2_ctrl_ops functions. | |
950 | * | |
951 | * This function is for integer type controls only. | |
952 | */ | |
0c4348ad SA |
953 | static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val) |
954 | { | |
955 | int rval; | |
956 | ||
957 | v4l2_ctrl_lock(ctrl); | |
958 | rval = __v4l2_ctrl_s_ctrl(ctrl, val); | |
959 | v4l2_ctrl_unlock(ctrl); | |
960 | ||
961 | return rval; | |
962 | } | |
0996517c | 963 | |
8c2721d5 MCC |
964 | /** |
965 | * v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value | |
966 | * from within a driver. | |
8ec4bee7 | 967 | * |
8c2721d5 MCC |
968 | * @ctrl: The control. |
969 | * | |
970 | * This returns the control's value safely by going through the control | |
971 | * framework. This function will lock the control's handler, so it cannot be | |
972 | * used from within the &v4l2_ctrl_ops functions. | |
973 | * | |
974 | * This function is for 64-bit integer type controls only. | |
975 | */ | |
03d5285b LP |
976 | s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl); |
977 | ||
8c2721d5 MCC |
978 | /** |
979 | * __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64(). | |
980 | * | |
981 | * @ctrl: The control. | |
982 | * @val: The new value. | |
983 | * | |
904aef0f HV |
984 | * This sets the control's new value safely by going through the control |
985 | * framework. This function assumes the control's handler is already locked, | |
986 | * allowing it to be used from within the &v4l2_ctrl_ops functions. | |
8c2721d5 MCC |
987 | * |
988 | * This function is for 64-bit integer type controls only. | |
989 | */ | |
0c4348ad SA |
990 | int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val); |
991 | ||
8ec4bee7 MCC |
992 | /** |
993 | * v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value | |
8c2721d5 MCC |
994 | * from within a driver. |
995 | * | |
996 | * @ctrl: The control. | |
997 | * @val: The new value. | |
998 | * | |
904aef0f | 999 | * This sets the control's new value safely by going through the control |
8c2721d5 MCC |
1000 | * framework. This function will lock the control's handler, so it cannot be |
1001 | * used from within the &v4l2_ctrl_ops functions. | |
1002 | * | |
1003 | * This function is for 64-bit integer type controls only. | |
1004 | */ | |
0c4348ad SA |
1005 | static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val) |
1006 | { | |
1007 | int rval; | |
1008 | ||
1009 | v4l2_ctrl_lock(ctrl); | |
1010 | rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val); | |
1011 | v4l2_ctrl_unlock(ctrl); | |
1012 | ||
1013 | return rval; | |
1014 | } | |
03d5285b | 1015 | |
8ec4bee7 MCC |
1016 | /** |
1017 | * __v4l2_ctrl_s_ctrl_string() - Unlocked variant of v4l2_ctrl_s_ctrl_string(). | |
8c2721d5 MCC |
1018 | * |
1019 | * @ctrl: The control. | |
1020 | * @s: The new string. | |
1021 | * | |
904aef0f HV |
1022 | * This sets the control's new string safely by going through the control |
1023 | * framework. This function assumes the control's handler is already locked, | |
1024 | * allowing it to be used from within the &v4l2_ctrl_ops functions. | |
8c2721d5 MCC |
1025 | * |
1026 | * This function is for string type controls only. | |
1027 | */ | |
5d0360a4 HV |
1028 | int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s); |
1029 | ||
8ec4bee7 MCC |
1030 | /** |
1031 | * v4l2_ctrl_s_ctrl_string() - Helper function to set a control's string value | |
8c2721d5 MCC |
1032 | * from within a driver. |
1033 | * | |
1034 | * @ctrl: The control. | |
1035 | * @s: The new string. | |
8ec4bee7 | 1036 | *Controls name |
904aef0f | 1037 | * This sets the control's new string safely by going through the control |
8c2721d5 MCC |
1038 | * framework. This function will lock the control's handler, so it cannot be |
1039 | * used from within the &v4l2_ctrl_ops functions. | |
1040 | * | |
1041 | * This function is for string type controls only. | |
1042 | */ | |
5d0360a4 HV |
1043 | static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s) |
1044 | { | |
1045 | int rval; | |
1046 | ||
1047 | v4l2_ctrl_lock(ctrl); | |
1048 | rval = __v4l2_ctrl_s_ctrl_string(ctrl, s); | |
1049 | v4l2_ctrl_unlock(ctrl); | |
1050 | ||
1051 | return rval; | |
1052 | } | |
1053 | ||
ce727574 | 1054 | /* Internal helper functions that deal with control events. */ |
3e366149 | 1055 | extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops; |
8ec4bee7 MCC |
1056 | |
1057 | /** | |
1058 | * v4l2_ctrl_replace - Function to be used as a callback to | |
1059 | * &struct v4l2_subscribed_event_ops replace\(\) | |
1060 | * | |
f8441a43 | 1061 | * @old: pointer to struct &v4l2_event with the reported |
8ec4bee7 | 1062 | * event; |
f8441a43 | 1063 | * @new: pointer to struct &v4l2_event with the modified |
8ec4bee7 MCC |
1064 | * event; |
1065 | */ | |
3e366149 | 1066 | void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new); |
8ec4bee7 MCC |
1067 | |
1068 | /** | |
1069 | * v4l2_ctrl_merge - Function to be used as a callback to | |
1070 | * &struct v4l2_subscribed_event_ops merge(\) | |
1071 | * | |
f8441a43 | 1072 | * @old: pointer to struct &v4l2_event with the reported |
8ec4bee7 | 1073 | * event; |
f8441a43 | 1074 | * @new: pointer to struct &v4l2_event with the merged |
8ec4bee7 MCC |
1075 | * event; |
1076 | */ | |
3e366149 | 1077 | void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new); |
6e239399 | 1078 | |
8ec4bee7 MCC |
1079 | /** |
1080 | * v4l2_ctrl_log_status - helper function to implement %VIDIOC_LOG_STATUS ioctl | |
1081 | * | |
1082 | * @file: pointer to struct file | |
1083 | * @fh: unused. Kept just to be compatible to the arguments expected by | |
1084 | * &struct v4l2_ioctl_ops.vidioc_log_status. | |
1085 | * | |
1086 | * Can be used as a vidioc_log_status function that just dumps all controls | |
1087 | * associated with the filehandle. | |
1088 | */ | |
e2ecb257 HV |
1089 | int v4l2_ctrl_log_status(struct file *file, void *fh); |
1090 | ||
8ec4bee7 MCC |
1091 | /** |
1092 | * v4l2_ctrl_subscribe_event - Subscribes to an event | |
1093 | * | |
1094 | * | |
1095 | * @fh: pointer to struct v4l2_fh | |
1096 | * @sub: pointer to &struct v4l2_event_subscription | |
1097 | * | |
1098 | * Can be used as a vidioc_subscribe_event function that just subscribes | |
1099 | * control events. | |
1100 | */ | |
a26243b0 | 1101 | int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh, |
85f5fe39 | 1102 | const struct v4l2_event_subscription *sub); |
a26243b0 | 1103 | |
8ec4bee7 MCC |
1104 | /** |
1105 | * v4l2_ctrl_poll - function to be used as a callback to the poll() | |
1106 | * That just polls for control events. | |
1107 | * | |
1108 | * @file: pointer to struct file | |
1109 | * @wait: pointer to struct poll_table_struct | |
1110 | */ | |
c23e0cb8 | 1111 | __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait); |
a26243b0 | 1112 | |
6fa6f831 HV |
1113 | /** |
1114 | * v4l2_ctrl_request_setup - helper function to apply control values in a request | |
1115 | * | |
1116 | * @req: The request | |
1117 | * @parent: The parent control handler ('priv' in media_request_object_find()) | |
1118 | * | |
1119 | * This is a helper function to call the control handler's s_ctrl callback with | |
1120 | * the control values contained in the request. Do note that this approach of | |
1121 | * applying control values in a request is only applicable to memory-to-memory | |
1122 | * devices. | |
1123 | */ | |
1124 | void v4l2_ctrl_request_setup(struct media_request *req, | |
1125 | struct v4l2_ctrl_handler *parent); | |
1126 | ||
1127 | /** | |
1128 | * v4l2_ctrl_request_complete - Complete a control handler request object | |
1129 | * | |
1130 | * @req: The request | |
1131 | * @parent: The parent control handler ('priv' in media_request_object_find()) | |
1132 | * | |
1133 | * This function is to be called on each control handler that may have had a | |
1134 | * request object associated with it, i.e. control handlers of a driver that | |
1135 | * supports requests. | |
1136 | * | |
1137 | * The function first obtains the values of any volatile controls in the control | |
1138 | * handler and attach them to the request. Then, the function completes the | |
1139 | * request object. | |
1140 | */ | |
1141 | void v4l2_ctrl_request_complete(struct media_request *req, | |
5f611d74 HV |
1142 | struct v4l2_ctrl_handler *parent); |
1143 | ||
1144 | /** | |
1145 | * v4l2_ctrl_request_hdl_find - Find the control handler in the request | |
1146 | * | |
1147 | * @req: The request | |
1148 | * @parent: The parent control handler ('priv' in media_request_object_find()) | |
1149 | * | |
1150 | * This function finds the control handler in the request. It may return | |
1151 | * NULL if not found. When done, you must call v4l2_ctrl_request_put_hdl() | |
1152 | * with the returned handler pointer. | |
1153 | * | |
1154 | * If the request is not in state VALIDATING or QUEUED, then this function | |
1155 | * will always return NULL. | |
1156 | * | |
1157 | * Note that in state VALIDATING the req_queue_mutex is held, so | |
1158 | * no objects can be added or deleted from the request. | |
1159 | * | |
1160 | * In state QUEUED it is the driver that will have to ensure this. | |
1161 | */ | |
1162 | struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req, | |
1163 | struct v4l2_ctrl_handler *parent); | |
1164 | ||
1165 | /** | |
1166 | * v4l2_ctrl_request_hdl_put - Put the control handler | |
1167 | * | |
1168 | * @hdl: Put this control handler | |
1169 | * | |
1170 | * This function released the control handler previously obtained from' | |
1171 | * v4l2_ctrl_request_hdl_find(). | |
1172 | */ | |
1173 | static inline void v4l2_ctrl_request_hdl_put(struct v4l2_ctrl_handler *hdl) | |
1174 | { | |
1175 | if (hdl) | |
1176 | media_request_object_put(&hdl->req_obj); | |
1177 | } | |
1178 | ||
1179 | /** | |
1180 | * v4l2_ctrl_request_ctrl_find() - Find a control with the given ID. | |
1181 | * | |
1182 | * @hdl: The control handler from the request. | |
1183 | * @id: The ID of the control to find. | |
1184 | * | |
1185 | * This function returns a pointer to the control if this control is | |
1186 | * part of the request or NULL otherwise. | |
1187 | */ | |
1188 | struct v4l2_ctrl * | |
1189 | v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id); | |
6fa6f831 | 1190 | |
8ec4bee7 MCC |
1191 | /* Helpers for ioctl_ops */ |
1192 | ||
1193 | /** | |
1194 | * v4l2_queryctrl - Helper function to implement | |
1195 | * :ref:`VIDIOC_QUERYCTRL <vidioc_queryctrl>` ioctl | |
1196 | * | |
1197 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
1198 | * @qc: pointer to &struct v4l2_queryctrl | |
1199 | * | |
1200 | * If hdl == NULL then they will all return -EINVAL. | |
1201 | */ | |
0996517c | 1202 | int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc); |
8ec4bee7 MCC |
1203 | |
1204 | /** | |
1205 | * v4l2_query_ext_ctrl - Helper function to implement | |
1206 | * :ref:`VIDIOC_QUERY_EXT_CTRL <vidioc_queryctrl>` ioctl | |
1207 | * | |
1208 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
1209 | * @qc: pointer to &struct v4l2_query_ext_ctrl | |
1210 | * | |
1211 | * If hdl == NULL then they will all return -EINVAL. | |
1212 | */ | |
1213 | int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, | |
1214 | struct v4l2_query_ext_ctrl *qc); | |
1215 | ||
1216 | /** | |
1217 | * v4l2_querymenu - Helper function to implement | |
1218 | * :ref:`VIDIOC_QUERYMENU <vidioc_queryctrl>` ioctl | |
1219 | * | |
1220 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
1221 | * @qm: pointer to &struct v4l2_querymenu | |
1222 | * | |
1223 | * If hdl == NULL then they will all return -EINVAL. | |
1224 | */ | |
0996517c | 1225 | int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm); |
8ec4bee7 MCC |
1226 | |
1227 | /** | |
1228 | * v4l2_g_ctrl - Helper function to implement | |
1229 | * :ref:`VIDIOC_G_CTRL <vidioc_g_ctrl>` ioctl | |
1230 | * | |
1231 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
1232 | * @ctrl: pointer to &struct v4l2_control | |
1233 | * | |
1234 | * If hdl == NULL then they will all return -EINVAL. | |
1235 | */ | |
0996517c | 1236 | int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl); |
8ec4bee7 MCC |
1237 | |
1238 | /** | |
1239 | * v4l2_s_ctrl - Helper function to implement | |
1240 | * :ref:`VIDIOC_S_CTRL <vidioc_g_ctrl>` ioctl | |
1241 | * | |
1242 | * @fh: pointer to &struct v4l2_fh | |
1243 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
1244 | * | |
1245 | * @ctrl: pointer to &struct v4l2_control | |
1246 | * | |
1247 | * If hdl == NULL then they will all return -EINVAL. | |
1248 | */ | |
ab892bac | 1249 | int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
8ec4bee7 MCC |
1250 | struct v4l2_control *ctrl); |
1251 | ||
1252 | /** | |
1253 | * v4l2_g_ext_ctrls - Helper function to implement | |
1254 | * :ref:`VIDIOC_G_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl | |
1255 | * | |
1256 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
c41e9cff | 1257 | * @mdev: pointer to &struct media_device |
8ec4bee7 MCC |
1258 | * @c: pointer to &struct v4l2_ext_controls |
1259 | * | |
1260 | * If hdl == NULL then they will all return -EINVAL. | |
1261 | */ | |
c41e9cff | 1262 | int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev, |
8ec4bee7 MCC |
1263 | struct v4l2_ext_controls *c); |
1264 | ||
1265 | /** | |
1266 | * v4l2_try_ext_ctrls - Helper function to implement | |
1267 | * :ref:`VIDIOC_TRY_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl | |
1268 | * | |
1269 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
c41e9cff | 1270 | * @mdev: pointer to &struct media_device |
8ec4bee7 MCC |
1271 | * @c: pointer to &struct v4l2_ext_controls |
1272 | * | |
1273 | * If hdl == NULL then they will all return -EINVAL. | |
1274 | */ | |
1275 | int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, | |
c41e9cff | 1276 | struct media_device *mdev, |
8ec4bee7 MCC |
1277 | struct v4l2_ext_controls *c); |
1278 | ||
1279 | /** | |
1280 | * v4l2_s_ext_ctrls - Helper function to implement | |
1281 | * :ref:`VIDIOC_S_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl | |
1282 | * | |
1283 | * @fh: pointer to &struct v4l2_fh | |
1284 | * @hdl: pointer to &struct v4l2_ctrl_handler | |
c41e9cff | 1285 | * @mdev: pointer to &struct media_device |
8ec4bee7 MCC |
1286 | * @c: pointer to &struct v4l2_ext_controls |
1287 | * | |
1288 | * If hdl == NULL then they will all return -EINVAL. | |
1289 | */ | |
ab892bac | 1290 | int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
c41e9cff | 1291 | struct media_device *mdev, |
8ec4bee7 | 1292 | struct v4l2_ext_controls *c); |
0996517c | 1293 | |
8ec4bee7 MCC |
1294 | /** |
1295 | * v4l2_ctrl_subdev_subscribe_event - Helper function to implement | |
4a3fad70 | 1296 | * as a &struct v4l2_subdev_core_ops subscribe_event function |
8ec4bee7 MCC |
1297 | * that just subscribes control events. |
1298 | * | |
1299 | * @sd: pointer to &struct v4l2_subdev | |
1300 | * @fh: pointer to &struct v4l2_fh | |
1301 | * @sub: pointer to &struct v4l2_event_subscription | |
1302 | */ | |
22fa4279 SN |
1303 | int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, |
1304 | struct v4l2_event_subscription *sub); | |
1305 | ||
8ec4bee7 MCC |
1306 | /** |
1307 | * v4l2_ctrl_subdev_log_status - Log all controls owned by subdev's control | |
1308 | * handler. | |
1309 | * | |
1310 | * @sd: pointer to &struct v4l2_subdev | |
1311 | */ | |
ffa9b9f0 SN |
1312 | int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd); |
1313 | ||
0996517c | 1314 | #endif |