| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | /* |
| 3 | V4L2 device support header. |
| 4 | |
| 5 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
| 6 | |
| 7 | */ |
| 8 | |
| 9 | #ifndef _V4L2_DEVICE_H |
| 10 | #define _V4L2_DEVICE_H |
| 11 | |
| 12 | #include <media/media-device.h> |
| 13 | #include <media/v4l2-subdev.h> |
| 14 | #include <media/v4l2-dev.h> |
| 15 | |
| 16 | #define V4L2_DEVICE_NAME_SIZE (20 + 16) |
| 17 | |
| 18 | struct v4l2_ctrl_handler; |
| 19 | |
| 20 | /** |
| 21 | * struct v4l2_device - main struct to for V4L2 device drivers |
| 22 | * |
| 23 | * @dev: pointer to struct device. |
| 24 | * @mdev: pointer to struct media_device, may be NULL. |
| 25 | * @subdevs: used to keep track of the registered subdevs |
| 26 | * @lock: lock this struct; can be used by the driver as well |
| 27 | * if this struct is embedded into a larger struct. |
| 28 | * @name: unique device name, by default the driver name + bus ID |
| 29 | * @notify: notify operation called by some sub-devices. |
| 30 | * @ctrl_handler: The control handler. May be %NULL. |
| 31 | * @prio: Device's priority state |
| 32 | * @ref: Keep track of the references to this struct. |
| 33 | * @release: Release function that is called when the ref count |
| 34 | * goes to 0. |
| 35 | * |
| 36 | * Each instance of a V4L2 device should create the v4l2_device struct, |
| 37 | * either stand-alone or embedded in a larger struct. |
| 38 | * |
| 39 | * It allows easy access to sub-devices (see v4l2-subdev.h) and provides |
| 40 | * basic V4L2 device-level support. |
| 41 | * |
| 42 | * .. note:: |
| 43 | * |
| 44 | * #) @dev->driver_data points to this struct. |
| 45 | * #) @dev might be %NULL if there is no parent device |
| 46 | */ |
| 47 | struct v4l2_device { |
| 48 | struct device *dev; |
| 49 | struct media_device *mdev; |
| 50 | struct list_head subdevs; |
| 51 | spinlock_t lock; |
| 52 | char name[V4L2_DEVICE_NAME_SIZE]; |
| 53 | void (*notify)(struct v4l2_subdev *sd, |
| 54 | unsigned int notification, void *arg); |
| 55 | struct v4l2_ctrl_handler *ctrl_handler; |
| 56 | struct v4l2_prio_state prio; |
| 57 | struct kref ref; |
| 58 | void (*release)(struct v4l2_device *v4l2_dev); |
| 59 | }; |
| 60 | |
| 61 | /** |
| 62 | * v4l2_device_get - gets a V4L2 device reference |
| 63 | * |
| 64 | * @v4l2_dev: pointer to struct &v4l2_device |
| 65 | * |
| 66 | * This is an ancillary routine meant to increment the usage for the |
| 67 | * struct &v4l2_device pointed by @v4l2_dev. |
| 68 | */ |
| 69 | static inline void v4l2_device_get(struct v4l2_device *v4l2_dev) |
| 70 | { |
| 71 | kref_get(&v4l2_dev->ref); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * v4l2_device_put - puts a V4L2 device reference |
| 76 | * |
| 77 | * @v4l2_dev: pointer to struct &v4l2_device |
| 78 | * |
| 79 | * This is an ancillary routine meant to decrement the usage for the |
| 80 | * struct &v4l2_device pointed by @v4l2_dev. |
| 81 | */ |
| 82 | int v4l2_device_put(struct v4l2_device *v4l2_dev); |
| 83 | |
| 84 | /** |
| 85 | * v4l2_device_register - Initialize v4l2_dev and make @dev->driver_data |
| 86 | * point to @v4l2_dev. |
| 87 | * |
| 88 | * @dev: pointer to struct &device |
| 89 | * @v4l2_dev: pointer to struct &v4l2_device |
| 90 | * |
| 91 | * .. note:: |
| 92 | * @dev may be %NULL in rare cases (ISA devices). |
| 93 | * In such case the caller must fill in the @v4l2_dev->name field |
| 94 | * before calling this function. |
| 95 | */ |
| 96 | int __must_check v4l2_device_register(struct device *dev, |
| 97 | struct v4l2_device *v4l2_dev); |
| 98 | |
| 99 | /** |
| 100 | * v4l2_device_set_name - Optional function to initialize the |
| 101 | * name field of struct &v4l2_device |
| 102 | * |
| 103 | * @v4l2_dev: pointer to struct &v4l2_device |
| 104 | * @basename: base name for the device name |
| 105 | * @instance: pointer to a static atomic_t var with the instance usage for |
| 106 | * the device driver. |
| 107 | * |
| 108 | * v4l2_device_set_name() initializes the name field of struct &v4l2_device |
| 109 | * using the driver name and a driver-global atomic_t instance. |
| 110 | * |
| 111 | * This function will increment the instance counter and returns the |
| 112 | * instance value used in the name. |
| 113 | * |
| 114 | * Example: |
| 115 | * |
| 116 | * static atomic_t drv_instance = ATOMIC_INIT(0); |
| 117 | * |
| 118 | * ... |
| 119 | * |
| 120 | * instance = v4l2_device_set_name(&\ v4l2_dev, "foo", &\ drv_instance); |
| 121 | * |
| 122 | * The first time this is called the name field will be set to foo0 and |
| 123 | * this function returns 0. If the name ends with a digit (e.g. cx18), |
| 124 | * then the name will be set to cx18-0 since cx180 would look really odd. |
| 125 | */ |
| 126 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, |
| 127 | atomic_t *instance); |
| 128 | |
| 129 | /** |
| 130 | * v4l2_device_disconnect - Change V4L2 device state to disconnected. |
| 131 | * |
| 132 | * @v4l2_dev: pointer to struct v4l2_device |
| 133 | * |
| 134 | * Should be called when the USB parent disconnects. |
| 135 | * Since the parent disappears, this ensures that @v4l2_dev doesn't have |
| 136 | * an invalid parent pointer. |
| 137 | * |
| 138 | * .. note:: This function sets @v4l2_dev->dev to NULL. |
| 139 | */ |
| 140 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev); |
| 141 | |
| 142 | /** |
| 143 | * v4l2_device_unregister - Unregister all sub-devices and any other |
| 144 | * resources related to @v4l2_dev. |
| 145 | * |
| 146 | * @v4l2_dev: pointer to struct v4l2_device |
| 147 | */ |
| 148 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); |
| 149 | |
| 150 | /** |
| 151 | * v4l2_device_register_subdev - Registers a subdev with a v4l2 device. |
| 152 | * |
| 153 | * @v4l2_dev: pointer to struct &v4l2_device |
| 154 | * @sd: pointer to &struct v4l2_subdev |
| 155 | * |
| 156 | * While registered, the subdev module is marked as in-use. |
| 157 | * |
| 158 | * An error is returned if the module is no longer loaded on any attempts |
| 159 | * to register it. |
| 160 | */ |
| 161 | int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
| 162 | struct v4l2_subdev *sd); |
| 163 | |
| 164 | /** |
| 165 | * v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device. |
| 166 | * |
| 167 | * @sd: pointer to &struct v4l2_subdev |
| 168 | * |
| 169 | * .. note :: |
| 170 | * |
| 171 | * Can also be called if the subdev wasn't registered. In such |
| 172 | * case, it will do nothing. |
| 173 | */ |
| 174 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); |
| 175 | |
| 176 | /** |
| 177 | * __v4l2_device_register_ro_subdev_nodes - Registers device nodes for |
| 178 | * all subdevs of the v4l2 device that are marked with the |
| 179 | * %V4L2_SUBDEV_FL_HAS_DEVNODE flag. |
| 180 | * |
| 181 | * @v4l2_dev: pointer to struct v4l2_device |
| 182 | * @read_only: subdevices read-only flag. True to register the subdevices |
| 183 | * device nodes in read-only mode, false to allow full access to the |
| 184 | * subdevice userspace API. |
| 185 | */ |
| 186 | int __must_check |
| 187 | __v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev, |
| 188 | bool read_only); |
| 189 | |
| 190 | /** |
| 191 | * v4l2_device_register_subdev_nodes - Registers subdevices device nodes with |
| 192 | * unrestricted access to the subdevice userspace operations |
| 193 | * |
| 194 | * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation |
| 195 | * for more details. |
| 196 | * |
| 197 | * @v4l2_dev: pointer to struct v4l2_device |
| 198 | */ |
| 199 | static inline int __must_check |
| 200 | v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) |
| 201 | { |
| 202 | #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) |
| 203 | return __v4l2_device_register_subdev_nodes(v4l2_dev, false); |
| 204 | #else |
| 205 | return 0; |
| 206 | #endif |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * v4l2_device_register_ro_subdev_nodes - Registers subdevices device nodes |
| 211 | * in read-only mode |
| 212 | * |
| 213 | * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation |
| 214 | * for more details. |
| 215 | * |
| 216 | * @v4l2_dev: pointer to struct v4l2_device |
| 217 | */ |
| 218 | static inline int __must_check |
| 219 | v4l2_device_register_ro_subdev_nodes(struct v4l2_device *v4l2_dev) |
| 220 | { |
| 221 | #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) |
| 222 | return __v4l2_device_register_subdev_nodes(v4l2_dev, true); |
| 223 | #else |
| 224 | return 0; |
| 225 | #endif |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * v4l2_subdev_notify - Sends a notification to v4l2_device. |
| 230 | * |
| 231 | * @sd: pointer to &struct v4l2_subdev |
| 232 | * @notification: type of notification. Please notice that the notification |
| 233 | * type is driver-specific. |
| 234 | * @arg: arguments for the notification. Those are specific to each |
| 235 | * notification type. |
| 236 | */ |
| 237 | static inline void v4l2_subdev_notify(struct v4l2_subdev *sd, |
| 238 | unsigned int notification, void *arg) |
| 239 | { |
| 240 | if (sd && sd->v4l2_dev && sd->v4l2_dev->notify) |
| 241 | sd->v4l2_dev->notify(sd, notification, arg); |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * v4l2_device_supports_requests - Test if requests are supported. |
| 246 | * |
| 247 | * @v4l2_dev: pointer to struct v4l2_device |
| 248 | */ |
| 249 | static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev) |
| 250 | { |
| 251 | return v4l2_dev->mdev && v4l2_dev->mdev->ops && |
| 252 | v4l2_dev->mdev->ops->req_queue; |
| 253 | } |
| 254 | |
| 255 | /* Helper macros to iterate over all subdevs. */ |
| 256 | |
| 257 | /** |
| 258 | * v4l2_device_for_each_subdev - Helper macro that interates over all |
| 259 | * sub-devices of a given &v4l2_device. |
| 260 | * |
| 261 | * @sd: pointer that will be filled by the macro with all |
| 262 | * &struct v4l2_subdev pointer used as an iterator by the loop. |
| 263 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 264 | * |
| 265 | * This macro iterates over all sub-devices owned by the @v4l2_dev device. |
| 266 | * It acts as a for loop iterator and executes the next statement with |
| 267 | * the @sd variable pointing to each sub-device in turn. |
| 268 | */ |
| 269 | #define v4l2_device_for_each_subdev(sd, v4l2_dev) \ |
| 270 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) |
| 271 | |
| 272 | /** |
| 273 | * __v4l2_device_call_subdevs_p - Calls the specified operation for |
| 274 | * all subdevs matching the condition. |
| 275 | * |
| 276 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 277 | * @sd: pointer that will be filled by the macro with all |
| 278 | * &struct v4l2_subdev pointer used as an iterator by the loop. |
| 279 | * @cond: condition to be match |
| 280 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 281 | * Each element there groups a set of operations functions. |
| 282 | * @f: operation function that will be called if @cond matches. |
| 283 | * The operation functions are defined in groups, according to |
| 284 | * each element at &struct v4l2_subdev_ops. |
| 285 | * @args: arguments for @f. |
| 286 | * |
| 287 | * Ignore any errors. |
| 288 | * |
| 289 | * Note: subdevs cannot be added or deleted while walking |
| 290 | * the subdevs list. |
| 291 | */ |
| 292 | #define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...) \ |
| 293 | do { \ |
| 294 | list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) \ |
| 295 | if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \ |
| 296 | (sd)->ops->o->f((sd) , ##args); \ |
| 297 | } while (0) |
| 298 | |
| 299 | /** |
| 300 | * __v4l2_device_call_subdevs - Calls the specified operation for |
| 301 | * all subdevs matching the condition. |
| 302 | * |
| 303 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 304 | * @cond: condition to be match |
| 305 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 306 | * Each element there groups a set of operations functions. |
| 307 | * @f: operation function that will be called if @cond matches. |
| 308 | * The operation functions are defined in groups, according to |
| 309 | * each element at &struct v4l2_subdev_ops. |
| 310 | * @args: arguments for @f. |
| 311 | * |
| 312 | * Ignore any errors. |
| 313 | * |
| 314 | * Note: subdevs cannot be added or deleted while walking |
| 315 | * the subdevs list. |
| 316 | */ |
| 317 | #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \ |
| 318 | do { \ |
| 319 | struct v4l2_subdev *__sd; \ |
| 320 | \ |
| 321 | __v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o, \ |
| 322 | f , ##args); \ |
| 323 | } while (0) |
| 324 | |
| 325 | /** |
| 326 | * __v4l2_device_call_subdevs_until_err_p - Calls the specified operation for |
| 327 | * all subdevs matching the condition. |
| 328 | * |
| 329 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 330 | * @sd: pointer that will be filled by the macro with all |
| 331 | * &struct v4l2_subdev sub-devices associated with @v4l2_dev. |
| 332 | * @cond: condition to be match |
| 333 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 334 | * Each element there groups a set of operations functions. |
| 335 | * @f: operation function that will be called if @cond matches. |
| 336 | * The operation functions are defined in groups, according to |
| 337 | * each element at &struct v4l2_subdev_ops. |
| 338 | * @args: arguments for @f. |
| 339 | * |
| 340 | * Return: |
| 341 | * |
| 342 | * If the operation returns an error other than 0 or ``-ENOIOCTLCMD`` |
| 343 | * for any subdevice, then abort and return with that error code, zero |
| 344 | * otherwise. |
| 345 | * |
| 346 | * Note: subdevs cannot be added or deleted while walking |
| 347 | * the subdevs list. |
| 348 | */ |
| 349 | #define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \ |
| 350 | ({ \ |
| 351 | long __err = 0; \ |
| 352 | \ |
| 353 | list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) { \ |
| 354 | if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \ |
| 355 | __err = (sd)->ops->o->f((sd) , ##args); \ |
| 356 | if (__err && __err != -ENOIOCTLCMD) \ |
| 357 | break; \ |
| 358 | } \ |
| 359 | (__err == -ENOIOCTLCMD) ? 0 : __err; \ |
| 360 | }) |
| 361 | |
| 362 | /** |
| 363 | * __v4l2_device_call_subdevs_until_err - Calls the specified operation for |
| 364 | * all subdevs matching the condition. |
| 365 | * |
| 366 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 367 | * @cond: condition to be match |
| 368 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 369 | * Each element there groups a set of operations functions. |
| 370 | * @f: operation function that will be called if @cond matches. |
| 371 | * The operation functions are defined in groups, according to |
| 372 | * each element at &struct v4l2_subdev_ops. |
| 373 | * @args: arguments for @f. |
| 374 | * |
| 375 | * Return: |
| 376 | * |
| 377 | * If the operation returns an error other than 0 or ``-ENOIOCTLCMD`` |
| 378 | * for any subdevice, then abort and return with that error code, |
| 379 | * zero otherwise. |
| 380 | * |
| 381 | * Note: subdevs cannot be added or deleted while walking |
| 382 | * the subdevs list. |
| 383 | */ |
| 384 | #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \ |
| 385 | ({ \ |
| 386 | struct v4l2_subdev *__sd; \ |
| 387 | __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o, \ |
| 388 | f , ##args); \ |
| 389 | }) |
| 390 | |
| 391 | /** |
| 392 | * v4l2_device_call_all - Calls the specified operation for |
| 393 | * all subdevs matching the &v4l2_subdev.grp_id, as assigned |
| 394 | * by the bridge driver. |
| 395 | * |
| 396 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 397 | * @grpid: &struct v4l2_subdev->grp_id group ID to match. |
| 398 | * Use 0 to match them all. |
| 399 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 400 | * Each element there groups a set of operations functions. |
| 401 | * @f: operation function that will be called if @cond matches. |
| 402 | * The operation functions are defined in groups, according to |
| 403 | * each element at &struct v4l2_subdev_ops. |
| 404 | * @args: arguments for @f. |
| 405 | * |
| 406 | * Ignore any errors. |
| 407 | * |
| 408 | * Note: subdevs cannot be added or deleted while walking |
| 409 | * the subdevs list. |
| 410 | */ |
| 411 | #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \ |
| 412 | do { \ |
| 413 | struct v4l2_subdev *__sd; \ |
| 414 | \ |
| 415 | __v4l2_device_call_subdevs_p(v4l2_dev, __sd, \ |
| 416 | (grpid) == 0 || __sd->grp_id == (grpid), o, f , \ |
| 417 | ##args); \ |
| 418 | } while (0) |
| 419 | |
| 420 | /** |
| 421 | * v4l2_device_call_until_err - Calls the specified operation for |
| 422 | * all subdevs matching the &v4l2_subdev.grp_id, as assigned |
| 423 | * by the bridge driver, until an error occurs. |
| 424 | * |
| 425 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 426 | * @grpid: &struct v4l2_subdev->grp_id group ID to match. |
| 427 | * Use 0 to match them all. |
| 428 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 429 | * Each element there groups a set of operations functions. |
| 430 | * @f: operation function that will be called if @cond matches. |
| 431 | * The operation functions are defined in groups, according to |
| 432 | * each element at &struct v4l2_subdev_ops. |
| 433 | * @args: arguments for @f. |
| 434 | * |
| 435 | * Return: |
| 436 | * |
| 437 | * If the operation returns an error other than 0 or ``-ENOIOCTLCMD`` |
| 438 | * for any subdevice, then abort and return with that error code, |
| 439 | * zero otherwise. |
| 440 | * |
| 441 | * Note: subdevs cannot be added or deleted while walking |
| 442 | * the subdevs list. |
| 443 | */ |
| 444 | #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \ |
| 445 | ({ \ |
| 446 | struct v4l2_subdev *__sd; \ |
| 447 | __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \ |
| 448 | (grpid) == 0 || __sd->grp_id == (grpid), o, f , \ |
| 449 | ##args); \ |
| 450 | }) |
| 451 | |
| 452 | /** |
| 453 | * v4l2_device_mask_call_all - Calls the specified operation for |
| 454 | * all subdevices where a group ID matches a specified bitmask. |
| 455 | * |
| 456 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 457 | * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id |
| 458 | * group ID to be matched. Use 0 to match them all. |
| 459 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 460 | * Each element there groups a set of operations functions. |
| 461 | * @f: operation function that will be called if @cond matches. |
| 462 | * The operation functions are defined in groups, according to |
| 463 | * each element at &struct v4l2_subdev_ops. |
| 464 | * @args: arguments for @f. |
| 465 | * |
| 466 | * Ignore any errors. |
| 467 | * |
| 468 | * Note: subdevs cannot be added or deleted while walking |
| 469 | * the subdevs list. |
| 470 | */ |
| 471 | #define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...) \ |
| 472 | do { \ |
| 473 | struct v4l2_subdev *__sd; \ |
| 474 | \ |
| 475 | __v4l2_device_call_subdevs_p(v4l2_dev, __sd, \ |
| 476 | (grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o, \ |
| 477 | f , ##args); \ |
| 478 | } while (0) |
| 479 | |
| 480 | /** |
| 481 | * v4l2_device_mask_call_until_err - Calls the specified operation for |
| 482 | * all subdevices where a group ID matches a specified bitmask. |
| 483 | * |
| 484 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 485 | * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id |
| 486 | * group ID to be matched. Use 0 to match them all. |
| 487 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 488 | * Each element there groups a set of operations functions. |
| 489 | * @f: operation function that will be called if @cond matches. |
| 490 | * The operation functions are defined in groups, according to |
| 491 | * each element at &struct v4l2_subdev_ops. |
| 492 | * @args: arguments for @f. |
| 493 | * |
| 494 | * Return: |
| 495 | * |
| 496 | * If the operation returns an error other than 0 or ``-ENOIOCTLCMD`` |
| 497 | * for any subdevice, then abort and return with that error code, |
| 498 | * zero otherwise. |
| 499 | * |
| 500 | * Note: subdevs cannot be added or deleted while walking |
| 501 | * the subdevs list. |
| 502 | */ |
| 503 | #define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \ |
| 504 | ({ \ |
| 505 | struct v4l2_subdev *__sd; \ |
| 506 | __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \ |
| 507 | (grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o, \ |
| 508 | f , ##args); \ |
| 509 | }) |
| 510 | |
| 511 | |
| 512 | /** |
| 513 | * v4l2_device_has_op - checks if any subdev with matching grpid has a |
| 514 | * given ops. |
| 515 | * |
| 516 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 517 | * @grpid: &struct v4l2_subdev->grp_id group ID to match. |
| 518 | * Use 0 to match them all. |
| 519 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 520 | * Each element there groups a set of operations functions. |
| 521 | * @f: operation function that will be called if @cond matches. |
| 522 | * The operation functions are defined in groups, according to |
| 523 | * each element at &struct v4l2_subdev_ops. |
| 524 | */ |
| 525 | #define v4l2_device_has_op(v4l2_dev, grpid, o, f) \ |
| 526 | ({ \ |
| 527 | struct v4l2_subdev *__sd; \ |
| 528 | bool __result = false; \ |
| 529 | list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \ |
| 530 | if ((grpid) && __sd->grp_id != (grpid)) \ |
| 531 | continue; \ |
| 532 | if (v4l2_subdev_has_op(__sd, o, f)) { \ |
| 533 | __result = true; \ |
| 534 | break; \ |
| 535 | } \ |
| 536 | } \ |
| 537 | __result; \ |
| 538 | }) |
| 539 | |
| 540 | /** |
| 541 | * v4l2_device_mask_has_op - checks if any subdev with matching group |
| 542 | * mask has a given ops. |
| 543 | * |
| 544 | * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over. |
| 545 | * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id |
| 546 | * group ID to be matched. Use 0 to match them all. |
| 547 | * @o: name of the element at &struct v4l2_subdev_ops that contains @f. |
| 548 | * Each element there groups a set of operations functions. |
| 549 | * @f: operation function that will be called if @cond matches. |
| 550 | * The operation functions are defined in groups, according to |
| 551 | * each element at &struct v4l2_subdev_ops. |
| 552 | */ |
| 553 | #define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f) \ |
| 554 | ({ \ |
| 555 | struct v4l2_subdev *__sd; \ |
| 556 | bool __result = false; \ |
| 557 | list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \ |
| 558 | if ((grpmsk) && !(__sd->grp_id & (grpmsk))) \ |
| 559 | continue; \ |
| 560 | if (v4l2_subdev_has_op(__sd, o, f)) { \ |
| 561 | __result = true; \ |
| 562 | break; \ |
| 563 | } \ |
| 564 | } \ |
| 565 | __result; \ |
| 566 | }) |
| 567 | |
| 568 | #endif |