1 // SPDX-License-Identifier: GPL-2.0-only 2 /* The industrial I/O core, trigger handling functions 3 * 4 * Copyright (c) 2008 Jonathan Cameron 5 */ 6 7 #include <linux/cleanup.h> 8 #include <linux/kernel.h> 9 #include <linux/idr.h> 10 #include <linux/err.h> 11 #include <linux/device.h> 12 #include <linux/interrupt.h> 13 #include <linux/list.h> 14 #include <linux/slab.h> 15 16 #include <linux/iio/iio.h> 17 #include <linux/iio/iio-opaque.h> 18 #include <linux/iio/trigger.h> 19 #include "iio_core.h" 20 #include "iio_core_trigger.h" 21 #include <linux/iio/trigger_consumer.h> 22 23 /* RFC - Question of approach 24 * Make the common case (single sensor single trigger) 25 * simple by starting trigger capture from when first sensors 26 * is added. 27 * 28 * Complex simultaneous start requires use of 'hold' functionality 29 * of the trigger. (not implemented) 30 * 31 * Any other suggestions? 32 */ 33 34 static DEFINE_IDA(iio_trigger_ida); 35 36 /* Single list of all available triggers */ 37 static LIST_HEAD(iio_trigger_list); 38 static DEFINE_MUTEX(iio_trigger_list_lock); 39 40 /** 41 * name_show() - retrieve useful identifying name 42 * @dev: device associated with the iio_trigger 43 * @attr: pointer to the device_attribute structure that is 44 * being processed 45 * @buf: buffer to print the name into 46 * 47 * Return: a negative number on failure or the number of written 48 * characters on success. 49 */ 50 static ssize_t name_show(struct device *dev, struct device_attribute *attr, 51 char *buf) 52 { 53 struct iio_trigger *trig = to_iio_trigger(dev); 54 55 return sysfs_emit(buf, "%s\n", trig->name); 56 } 57 58 static DEVICE_ATTR_RO(name); 59 60 static struct attribute *iio_trig_dev_attrs[] = { 61 &dev_attr_name.attr, 62 NULL, 63 }; 64 ATTRIBUTE_GROUPS(iio_trig_dev); 65 66 static struct iio_trigger *__iio_trigger_find_by_name(const char *name); 67 68 int iio_trigger_register(struct iio_trigger *trig_info) 69 { 70 int ret; 71 72 trig_info->id = ida_alloc(&iio_trigger_ida, GFP_KERNEL); 73 if (trig_info->id < 0) 74 return trig_info->id; 75 76 /* Set the name used for the sysfs directory etc */ 77 dev_set_name(&trig_info->dev, "trigger%d", trig_info->id); 78 79 ret = device_add(&trig_info->dev); 80 if (ret) 81 goto error_unregister_id; 82 83 /* Add to list of available triggers held by the IIO core */ 84 scoped_guard(mutex, &iio_trigger_list_lock) { 85 if (__iio_trigger_find_by_name(trig_info->name)) { 86 pr_err("Duplicate trigger name '%s'\n", trig_info->name); 87 ret = -EEXIST; 88 goto error_device_del; 89 } 90 list_add_tail(&trig_info->list, &iio_trigger_list); 91 } 92 93 return 0; 94 95 error_device_del: 96 device_del(&trig_info->dev); 97 error_unregister_id: 98 ida_free(&iio_trigger_ida, trig_info->id); 99 return ret; 100 } 101 EXPORT_SYMBOL(iio_trigger_register); 102 103 void iio_trigger_unregister(struct iio_trigger *trig_info) 104 { 105 scoped_guard(mutex, &iio_trigger_list_lock) 106 list_del(&trig_info->list); 107 108 ida_free(&iio_trigger_ida, trig_info->id); 109 /* Possible issue in here */ 110 device_del(&trig_info->dev); 111 } 112 EXPORT_SYMBOL(iio_trigger_unregister); 113 114 int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig) 115 { 116 struct iio_dev_opaque *iio_dev_opaque; 117 118 if (!indio_dev || !trig) 119 return -EINVAL; 120 121 iio_dev_opaque = to_iio_dev_opaque(indio_dev); 122 guard(mutex)(&iio_dev_opaque->mlock); 123 WARN_ON(iio_dev_opaque->trig_readonly); 124 125 indio_dev->trig = iio_trigger_get(trig); 126 iio_dev_opaque->trig_readonly = true; 127 128 return 0; 129 } 130 EXPORT_SYMBOL(iio_trigger_set_immutable); 131 132 /* Search for trigger by name, assuming iio_trigger_list_lock held */ 133 static struct iio_trigger *__iio_trigger_find_by_name(const char *name) 134 { 135 struct iio_trigger *iter; 136 137 list_for_each_entry(iter, &iio_trigger_list, list) 138 if (!strcmp(iter->name, name)) 139 return iter; 140 141 return NULL; 142 } 143 144 static struct iio_trigger *iio_trigger_acquire_by_name(const char *name) 145 { 146 struct iio_trigger *iter; 147 148 guard(mutex)(&iio_trigger_list_lock); 149 list_for_each_entry(iter, &iio_trigger_list, list) 150 if (sysfs_streq(iter->name, name)) 151 return iio_trigger_get(iter); 152 153 return NULL; 154 } 155 156 static void iio_reenable_work_fn(struct work_struct *work) 157 { 158 struct iio_trigger *trig = container_of(work, struct iio_trigger, 159 reenable_work); 160 161 /* 162 * This 'might' occur after the trigger state is set to disabled - 163 * in that case the driver should skip reenabling. 164 */ 165 trig->ops->reenable(trig); 166 } 167 168 /* 169 * In general, reenable callbacks may need to sleep and this path is 170 * not performance sensitive, so just queue up a work item 171 * to reneable the trigger for us. 172 * 173 * Races that can cause this. 174 * 1) A handler occurs entirely in interrupt context so the counter 175 * the final decrement is still in this interrupt. 176 * 2) The trigger has been removed, but one last interrupt gets through. 177 * 178 * For (1) we must call reenable, but not in atomic context. 179 * For (2) it should be safe to call reenanble, if drivers never blindly 180 * reenable after state is off. 181 */ 182 static void iio_trigger_notify_done_atomic(struct iio_trigger *trig) 183 { 184 if (atomic_dec_and_test(&trig->use_count) && trig->ops && 185 trig->ops->reenable) 186 schedule_work(&trig->reenable_work); 187 } 188 189 /** 190 * iio_trigger_poll() - Call the IRQ trigger handler of the consumers 191 * @trig: trigger which occurred 192 * 193 * This function should only be called from a hard IRQ context. 194 */ 195 void iio_trigger_poll(struct iio_trigger *trig) 196 { 197 int i; 198 199 if (!atomic_read(&trig->use_count)) { 200 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); 201 202 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { 203 if (trig->subirqs[i].enabled) 204 generic_handle_irq(trig->subirq_base + i); 205 else 206 iio_trigger_notify_done_atomic(trig); 207 } 208 } 209 } 210 EXPORT_SYMBOL(iio_trigger_poll); 211 212 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) 213 { 214 iio_trigger_poll(private); 215 return IRQ_HANDLED; 216 } 217 EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); 218 219 /** 220 * iio_trigger_poll_nested() - Call the threaded trigger handler of the 221 * consumers 222 * @trig: trigger which occurred 223 * 224 * This function should only be called from a kernel thread context. 225 */ 226 void iio_trigger_poll_nested(struct iio_trigger *trig) 227 { 228 int i; 229 230 if (!atomic_read(&trig->use_count)) { 231 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); 232 233 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { 234 if (trig->subirqs[i].enabled) 235 handle_nested_irq(trig->subirq_base + i); 236 else 237 iio_trigger_notify_done(trig); 238 } 239 } 240 } 241 EXPORT_SYMBOL(iio_trigger_poll_nested); 242 243 void iio_trigger_notify_done(struct iio_trigger *trig) 244 { 245 if (atomic_dec_and_test(&trig->use_count) && trig->ops && 246 trig->ops->reenable) 247 trig->ops->reenable(trig); 248 } 249 EXPORT_SYMBOL(iio_trigger_notify_done); 250 251 /* Trigger Consumer related functions */ 252 static int iio_trigger_get_irq(struct iio_trigger *trig) 253 { 254 int ret; 255 256 scoped_guard(mutex, &trig->pool_lock) { 257 ret = bitmap_find_free_region(trig->pool, 258 CONFIG_IIO_CONSUMERS_PER_TRIGGER, 259 ilog2(1)); 260 if (ret < 0) 261 return ret; 262 } 263 264 return ret + trig->subirq_base; 265 } 266 267 static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) 268 { 269 guard(mutex)(&trig->pool_lock); 270 clear_bit(irq - trig->subirq_base, trig->pool); 271 } 272 273 /* Complexity in here. With certain triggers (datardy) an acknowledgement 274 * may be needed if the pollfuncs do not include the data read for the 275 * triggering device. 276 * This is not currently handled. Alternative of not enabling trigger unless 277 * the relevant function is in there may be the best option. 278 */ 279 /* Worth protecting against double additions? */ 280 int iio_trigger_attach_poll_func(struct iio_trigger *trig, 281 struct iio_poll_func *pf) 282 { 283 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); 284 bool notinuse = 285 bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); 286 int ret = 0; 287 288 /* Prevent the module from being removed whilst attached to a trigger */ 289 __module_get(iio_dev_opaque->driver_module); 290 291 /* Get irq number */ 292 pf->irq = iio_trigger_get_irq(trig); 293 if (pf->irq < 0) { 294 pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n", 295 trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER); 296 goto out_put_module; 297 } 298 299 /* Request irq */ 300 ret = request_threaded_irq(pf->irq, pf->h, pf->thread, 301 pf->type, pf->name, 302 pf); 303 if (ret < 0) 304 goto out_put_irq; 305 306 /* Enable trigger in driver */ 307 if (trig->ops && trig->ops->set_trigger_state && notinuse) { 308 ret = trig->ops->set_trigger_state(trig, true); 309 if (ret) 310 goto out_free_irq; 311 } 312 313 /* 314 * Check if we just registered to our own trigger: we determine that 315 * this is the case if the IIO device and the trigger device share the 316 * same parent device. 317 */ 318 if (!iio_validate_own_trigger(pf->indio_dev, trig)) 319 trig->attached_own_device = true; 320 321 return ret; 322 323 out_free_irq: 324 free_irq(pf->irq, pf); 325 out_put_irq: 326 iio_trigger_put_irq(trig, pf->irq); 327 out_put_module: 328 module_put(iio_dev_opaque->driver_module); 329 return ret; 330 } 331 332 int iio_trigger_detach_poll_func(struct iio_trigger *trig, 333 struct iio_poll_func *pf) 334 { 335 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); 336 bool no_other_users = 337 bitmap_weight(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER) == 1; 338 int ret = 0; 339 340 if (trig->ops && trig->ops->set_trigger_state && no_other_users) { 341 ret = trig->ops->set_trigger_state(trig, false); 342 if (ret) 343 return ret; 344 } 345 if (pf->indio_dev->dev.parent == trig->dev.parent) 346 trig->attached_own_device = false; 347 iio_trigger_put_irq(trig, pf->irq); 348 free_irq(pf->irq, pf); 349 module_put(iio_dev_opaque->driver_module); 350 pf->irq = 0; 351 352 return ret; 353 } 354 355 irqreturn_t iio_pollfunc_store_time(int irq, void *p) 356 { 357 struct iio_poll_func *pf = p; 358 359 pf->timestamp = iio_get_time_ns(pf->indio_dev); 360 return IRQ_WAKE_THREAD; 361 } 362 EXPORT_SYMBOL(iio_pollfunc_store_time); 363 364 struct iio_poll_func 365 *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), 366 irqreturn_t (*thread)(int irq, void *p), 367 int type, 368 struct iio_dev *indio_dev, 369 const char *fmt, 370 ...) 371 { 372 va_list vargs; 373 struct iio_poll_func *pf; 374 375 pf = kmalloc(sizeof(*pf), GFP_KERNEL); 376 if (!pf) 377 return NULL; 378 va_start(vargs, fmt); 379 pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); 380 va_end(vargs); 381 if (pf->name == NULL) { 382 kfree(pf); 383 return NULL; 384 } 385 pf->h = h; 386 pf->thread = thread; 387 pf->type = type; 388 pf->indio_dev = indio_dev; 389 390 return pf; 391 } 392 EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); 393 394 void iio_dealloc_pollfunc(struct iio_poll_func *pf) 395 { 396 kfree(pf->name); 397 kfree(pf); 398 } 399 EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); 400 401 /** 402 * current_trigger_show() - trigger consumer sysfs query current trigger 403 * @dev: device associated with an industrial I/O device 404 * @attr: pointer to the device_attribute structure that 405 * is being processed 406 * @buf: buffer where the current trigger name will be printed into 407 * 408 * For trigger consumers the current_trigger interface allows the trigger 409 * used by the device to be queried. 410 * 411 * Return: a negative number on failure, the number of characters written 412 * on success or 0 if no trigger is available 413 */ 414 static ssize_t current_trigger_show(struct device *dev, 415 struct device_attribute *attr, char *buf) 416 { 417 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 418 419 if (indio_dev->trig) 420 return sysfs_emit(buf, "%s\n", indio_dev->trig->name); 421 return 0; 422 } 423 424 /** 425 * current_trigger_store() - trigger consumer sysfs set current trigger 426 * @dev: device associated with an industrial I/O device 427 * @attr: device attribute that is being processed 428 * @buf: string buffer that holds the name of the trigger 429 * @len: length of the trigger name held by buf 430 * 431 * For trigger consumers the current_trigger interface allows the trigger 432 * used for this device to be specified at run time based on the trigger's 433 * name. 434 * 435 * Return: negative error code on failure or length of the buffer 436 * on success 437 */ 438 static ssize_t current_trigger_store(struct device *dev, 439 struct device_attribute *attr, 440 const char *buf, size_t len) 441 { 442 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 443 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); 444 struct iio_trigger *oldtrig = indio_dev->trig; 445 struct iio_trigger *trig; 446 int ret; 447 448 scoped_guard(mutex, &iio_dev_opaque->mlock) { 449 if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) 450 return -EBUSY; 451 if (iio_dev_opaque->trig_readonly) 452 return -EPERM; 453 } 454 455 trig = iio_trigger_acquire_by_name(buf); 456 if (oldtrig == trig) { 457 ret = len; 458 goto out_trigger_put; 459 } 460 461 if (trig && indio_dev->info->validate_trigger) { 462 ret = indio_dev->info->validate_trigger(indio_dev, trig); 463 if (ret) 464 goto out_trigger_put; 465 } 466 467 if (trig && trig->ops && trig->ops->validate_device) { 468 ret = trig->ops->validate_device(trig, indio_dev); 469 if (ret) 470 goto out_trigger_put; 471 } 472 473 indio_dev->trig = trig; 474 475 if (oldtrig) { 476 if (indio_dev->modes & INDIO_EVENT_TRIGGERED) 477 iio_trigger_detach_poll_func(oldtrig, 478 indio_dev->pollfunc_event); 479 iio_trigger_put(oldtrig); 480 } 481 if (indio_dev->trig) { 482 if (indio_dev->modes & INDIO_EVENT_TRIGGERED) 483 iio_trigger_attach_poll_func(indio_dev->trig, 484 indio_dev->pollfunc_event); 485 } 486 487 return len; 488 489 out_trigger_put: 490 if (trig) 491 iio_trigger_put(trig); 492 return ret; 493 } 494 495 static DEVICE_ATTR_RW(current_trigger); 496 497 static struct attribute *iio_trigger_consumer_attrs[] = { 498 &dev_attr_current_trigger.attr, 499 NULL, 500 }; 501 502 static const struct attribute_group iio_trigger_consumer_attr_group = { 503 .name = "trigger", 504 .attrs = iio_trigger_consumer_attrs, 505 }; 506 507 static void iio_trig_release(struct device *device) 508 { 509 struct iio_trigger *trig = to_iio_trigger(device); 510 int i; 511 512 if (trig->subirq_base) { 513 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { 514 irq_modify_status(trig->subirq_base + i, 515 IRQ_NOAUTOEN, 516 IRQ_NOREQUEST | IRQ_NOPROBE); 517 irq_set_chip(trig->subirq_base + i, 518 NULL); 519 irq_set_handler(trig->subirq_base + i, 520 NULL); 521 } 522 523 irq_free_descs(trig->subirq_base, 524 CONFIG_IIO_CONSUMERS_PER_TRIGGER); 525 } 526 kfree(trig->name); 527 kfree(trig); 528 } 529 530 static const struct device_type iio_trig_type = { 531 .release = iio_trig_release, 532 .groups = iio_trig_dev_groups, 533 }; 534 535 static void iio_trig_subirqmask(struct irq_data *d) 536 { 537 struct irq_chip *chip = irq_data_get_irq_chip(d); 538 struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); 539 540 trig->subirqs[d->irq - trig->subirq_base].enabled = false; 541 } 542 543 static void iio_trig_subirqunmask(struct irq_data *d) 544 { 545 struct irq_chip *chip = irq_data_get_irq_chip(d); 546 struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); 547 548 trig->subirqs[d->irq - trig->subirq_base].enabled = true; 549 } 550 551 static __printf(3, 0) 552 struct iio_trigger *viio_trigger_alloc(struct device *parent, 553 struct module *this_mod, 554 const char *fmt, 555 va_list vargs) 556 { 557 struct iio_trigger *trig; 558 int i; 559 560 trig = kzalloc(sizeof(*trig), GFP_KERNEL); 561 if (!trig) 562 return NULL; 563 564 trig->dev.parent = parent; 565 trig->dev.type = &iio_trig_type; 566 trig->dev.bus = &iio_bus_type; 567 device_initialize(&trig->dev); 568 INIT_WORK(&trig->reenable_work, iio_reenable_work_fn); 569 570 mutex_init(&trig->pool_lock); 571 trig->subirq_base = irq_alloc_descs(-1, 0, 572 CONFIG_IIO_CONSUMERS_PER_TRIGGER, 573 0); 574 if (trig->subirq_base < 0) 575 goto free_trig; 576 577 trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); 578 if (trig->name == NULL) 579 goto free_descs; 580 581 INIT_LIST_HEAD(&trig->list); 582 583 trig->owner = this_mod; 584 585 trig->subirq_chip.name = trig->name; 586 trig->subirq_chip.irq_mask = &iio_trig_subirqmask; 587 trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; 588 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { 589 irq_set_chip(trig->subirq_base + i, &trig->subirq_chip); 590 irq_set_handler(trig->subirq_base + i, &handle_simple_irq); 591 irq_modify_status(trig->subirq_base + i, 592 IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); 593 } 594 595 return trig; 596 597 free_descs: 598 irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER); 599 free_trig: 600 kfree(trig); 601 return NULL; 602 } 603 604 /** 605 * __iio_trigger_alloc - Allocate a trigger 606 * @parent: Device to allocate iio_trigger for 607 * @this_mod: module allocating the trigger 608 * @fmt: trigger name format. If it includes format 609 * specifiers, the additional arguments following 610 * format are formatted and inserted in the resulting 611 * string replacing their respective specifiers. 612 * RETURNS: 613 * Pointer to allocated iio_trigger on success, NULL on failure. 614 */ 615 struct iio_trigger *__iio_trigger_alloc(struct device *parent, 616 struct module *this_mod, 617 const char *fmt, ...) 618 { 619 struct iio_trigger *trig; 620 va_list vargs; 621 622 va_start(vargs, fmt); 623 trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); 624 va_end(vargs); 625 626 return trig; 627 } 628 EXPORT_SYMBOL(__iio_trigger_alloc); 629 630 void iio_trigger_free(struct iio_trigger *trig) 631 { 632 if (trig) 633 put_device(&trig->dev); 634 } 635 EXPORT_SYMBOL(iio_trigger_free); 636 637 static void devm_iio_trigger_release(struct device *dev, void *res) 638 { 639 iio_trigger_free(*(struct iio_trigger **)res); 640 } 641 642 /** 643 * __devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() 644 * Managed iio_trigger_alloc. iio_trigger allocated with this function is 645 * automatically freed on driver detach. 646 * @parent: Device to allocate iio_trigger for 647 * @this_mod: module allocating the trigger 648 * @fmt: trigger name format. If it includes format 649 * specifiers, the additional arguments following 650 * format are formatted and inserted in the resulting 651 * string replacing their respective specifiers. 652 * 653 * 654 * RETURNS: 655 * Pointer to allocated iio_trigger on success, NULL on failure. 656 */ 657 struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, 658 struct module *this_mod, 659 const char *fmt, ...) 660 { 661 struct iio_trigger **ptr, *trig; 662 va_list vargs; 663 664 ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), 665 GFP_KERNEL); 666 if (!ptr) 667 return NULL; 668 669 /* use raw alloc_dr for kmalloc caller tracing */ 670 va_start(vargs, fmt); 671 trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); 672 va_end(vargs); 673 if (trig) { 674 *ptr = trig; 675 devres_add(parent, ptr); 676 } else { 677 devres_free(ptr); 678 } 679 680 return trig; 681 } 682 EXPORT_SYMBOL_GPL(__devm_iio_trigger_alloc); 683 684 static void devm_iio_trigger_unreg(void *trigger_info) 685 { 686 iio_trigger_unregister(trigger_info); 687 } 688 689 /** 690 * devm_iio_trigger_register - Resource-managed iio_trigger_register() 691 * @dev: device this trigger was allocated for 692 * @trig_info: trigger to register 693 * 694 * Managed iio_trigger_register(). The IIO trigger registered with this 695 * function is automatically unregistered on driver detach. This function 696 * calls iio_trigger_register() internally. Refer to that function for more 697 * information. 698 * 699 * RETURNS: 700 * 0 on success, negative error number on failure. 701 */ 702 int devm_iio_trigger_register(struct device *dev, 703 struct iio_trigger *trig_info) 704 { 705 int ret; 706 707 ret = iio_trigger_register(trig_info); 708 if (ret) 709 return ret; 710 711 return devm_add_action_or_reset(dev, devm_iio_trigger_unreg, trig_info); 712 } 713 EXPORT_SYMBOL_GPL(devm_iio_trigger_register); 714 715 bool iio_trigger_using_own(struct iio_dev *indio_dev) 716 { 717 return indio_dev->trig->attached_own_device; 718 } 719 EXPORT_SYMBOL(iio_trigger_using_own); 720 721 /** 722 * iio_validate_own_trigger - Check if a trigger and IIO device belong to 723 * the same device 724 * @idev: the IIO device to check 725 * @trig: the IIO trigger to check 726 * 727 * This function can be used as the validate_trigger callback for triggers that 728 * can only be attached to their own device. 729 * 730 * Return: 0 if both the trigger and the IIO device belong to the same 731 * device, -EINVAL otherwise. 732 */ 733 int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig) 734 { 735 if (idev->dev.parent != trig->dev.parent) 736 return -EINVAL; 737 return 0; 738 } 739 EXPORT_SYMBOL_GPL(iio_validate_own_trigger); 740 741 /** 742 * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to 743 * the same device 744 * @trig: The IIO trigger to check 745 * @indio_dev: the IIO device to check 746 * 747 * This function can be used as the validate_device callback for triggers that 748 * can only be attached to their own device. 749 * 750 * Return: 0 if both the trigger and the IIO device belong to the same 751 * device, -EINVAL otherwise. 752 */ 753 int iio_trigger_validate_own_device(struct iio_trigger *trig, 754 struct iio_dev *indio_dev) 755 { 756 if (indio_dev->dev.parent != trig->dev.parent) 757 return -EINVAL; 758 return 0; 759 } 760 EXPORT_SYMBOL(iio_trigger_validate_own_device); 761 762 int iio_device_register_trigger_consumer(struct iio_dev *indio_dev) 763 { 764 return iio_device_register_sysfs_group(indio_dev, 765 &iio_trigger_consumer_attr_group); 766 } 767 768 void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) 769 { 770 /* Clean up an associated but not attached trigger reference */ 771 if (indio_dev->trig) 772 iio_trigger_put(indio_dev->trig); 773 } 774 775 int iio_device_suspend_triggering(struct iio_dev *indio_dev) 776 { 777 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); 778 779 guard(mutex)(&iio_dev_opaque->mlock); 780 781 if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0)) 782 disable_irq(indio_dev->pollfunc->irq); 783 784 return 0; 785 } 786 EXPORT_SYMBOL(iio_device_suspend_triggering); 787 788 int iio_device_resume_triggering(struct iio_dev *indio_dev) 789 { 790 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); 791 792 guard(mutex)(&iio_dev_opaque->mlock); 793 794 if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0)) 795 enable_irq(indio_dev->pollfunc->irq); 796 797 return 0; 798 } 799 EXPORT_SYMBOL(iio_device_resume_triggering); 800