Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux/fpc-iii.git] / drivers / iio / industrialio-trigger.c
blob4061fed93f1f8f015cd99acb307c08962dd0bee0
1 /* The industrial I/O core, trigger handling functions
3 * Copyright (c) 2008 Jonathan Cameron
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 */
10 #include <linux/kernel.h>
11 #include <linux/idr.h>
12 #include <linux/err.h>
13 #include <linux/device.h>
14 #include <linux/interrupt.h>
15 #include <linux/list.h>
16 #include <linux/slab.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/trigger.h>
20 #include "iio_core.h"
21 #include "iio_core_trigger.h"
22 #include <linux/iio/trigger_consumer.h>
24 /* RFC - Question of approach
25 * Make the common case (single sensor single trigger)
26 * simple by starting trigger capture from when first sensors
27 * is added.
29 * Complex simultaneous start requires use of 'hold' functionality
30 * of the trigger. (not implemented)
32 * Any other suggestions?
35 static DEFINE_IDA(iio_trigger_ida);
37 /* Single list of all available triggers */
38 static LIST_HEAD(iio_trigger_list);
39 static DEFINE_MUTEX(iio_trigger_list_lock);
41 /**
42 * iio_trigger_read_name() - retrieve useful identifying name
43 * @dev: device associated with the iio_trigger
44 * @attr: pointer to the device_attribute structure that is
45 * being processed
46 * @buf: buffer to print the name into
48 * Return: a negative number on failure or the number of written
49 * characters on success.
51 static ssize_t iio_trigger_read_name(struct device *dev,
52 struct device_attribute *attr,
53 char *buf)
55 struct iio_trigger *trig = to_iio_trigger(dev);
56 return sprintf(buf, "%s\n", trig->name);
59 static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
61 static struct attribute *iio_trig_dev_attrs[] = {
62 &dev_attr_name.attr,
63 NULL,
65 ATTRIBUTE_GROUPS(iio_trig_dev);
67 static struct iio_trigger *__iio_trigger_find_by_name(const char *name);
69 int iio_trigger_register(struct iio_trigger *trig_info)
71 int ret;
73 /* trig_info->ops is required for the module member */
74 if (!trig_info->ops)
75 return -EINVAL;
77 trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
78 if (trig_info->id < 0)
79 return trig_info->id;
81 /* Set the name used for the sysfs directory etc */
82 dev_set_name(&trig_info->dev, "trigger%ld",
83 (unsigned long) trig_info->id);
85 ret = device_add(&trig_info->dev);
86 if (ret)
87 goto error_unregister_id;
89 /* Add to list of available triggers held by the IIO core */
90 mutex_lock(&iio_trigger_list_lock);
91 if (__iio_trigger_find_by_name(trig_info->name)) {
92 pr_err("Duplicate trigger name '%s'\n", trig_info->name);
93 ret = -EEXIST;
94 goto error_device_del;
96 list_add_tail(&trig_info->list, &iio_trigger_list);
97 mutex_unlock(&iio_trigger_list_lock);
99 return 0;
101 error_device_del:
102 mutex_unlock(&iio_trigger_list_lock);
103 device_del(&trig_info->dev);
104 error_unregister_id:
105 ida_simple_remove(&iio_trigger_ida, trig_info->id);
106 return ret;
108 EXPORT_SYMBOL(iio_trigger_register);
110 void iio_trigger_unregister(struct iio_trigger *trig_info)
112 mutex_lock(&iio_trigger_list_lock);
113 list_del(&trig_info->list);
114 mutex_unlock(&iio_trigger_list_lock);
116 ida_simple_remove(&iio_trigger_ida, trig_info->id);
117 /* Possible issue in here */
118 device_del(&trig_info->dev);
120 EXPORT_SYMBOL(iio_trigger_unregister);
122 int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig)
124 if (!indio_dev || !trig)
125 return -EINVAL;
127 mutex_lock(&indio_dev->mlock);
128 WARN_ON(indio_dev->trig_readonly);
130 indio_dev->trig = iio_trigger_get(trig);
131 indio_dev->trig_readonly = true;
132 mutex_unlock(&indio_dev->mlock);
134 return 0;
136 EXPORT_SYMBOL(iio_trigger_set_immutable);
138 /* Search for trigger by name, assuming iio_trigger_list_lock held */
139 static struct iio_trigger *__iio_trigger_find_by_name(const char *name)
141 struct iio_trigger *iter;
143 list_for_each_entry(iter, &iio_trigger_list, list)
144 if (!strcmp(iter->name, name))
145 return iter;
147 return NULL;
150 static struct iio_trigger *iio_trigger_acquire_by_name(const char *name)
152 struct iio_trigger *trig = NULL, *iter;
154 mutex_lock(&iio_trigger_list_lock);
155 list_for_each_entry(iter, &iio_trigger_list, list)
156 if (sysfs_streq(iter->name, name)) {
157 trig = iter;
158 iio_trigger_get(trig);
159 break;
161 mutex_unlock(&iio_trigger_list_lock);
163 return trig;
166 void iio_trigger_poll(struct iio_trigger *trig)
168 int i;
170 if (!atomic_read(&trig->use_count)) {
171 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
173 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
174 if (trig->subirqs[i].enabled)
175 generic_handle_irq(trig->subirq_base + i);
176 else
177 iio_trigger_notify_done(trig);
181 EXPORT_SYMBOL(iio_trigger_poll);
183 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
185 iio_trigger_poll(private);
186 return IRQ_HANDLED;
188 EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
190 void iio_trigger_poll_chained(struct iio_trigger *trig)
192 int i;
194 if (!atomic_read(&trig->use_count)) {
195 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
197 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
198 if (trig->subirqs[i].enabled)
199 handle_nested_irq(trig->subirq_base + i);
200 else
201 iio_trigger_notify_done(trig);
205 EXPORT_SYMBOL(iio_trigger_poll_chained);
207 void iio_trigger_notify_done(struct iio_trigger *trig)
209 if (atomic_dec_and_test(&trig->use_count) && trig->ops->try_reenable)
210 if (trig->ops->try_reenable(trig))
211 /* Missed an interrupt so launch new poll now */
212 iio_trigger_poll(trig);
214 EXPORT_SYMBOL(iio_trigger_notify_done);
216 /* Trigger Consumer related functions */
217 static int iio_trigger_get_irq(struct iio_trigger *trig)
219 int ret;
220 mutex_lock(&trig->pool_lock);
221 ret = bitmap_find_free_region(trig->pool,
222 CONFIG_IIO_CONSUMERS_PER_TRIGGER,
223 ilog2(1));
224 mutex_unlock(&trig->pool_lock);
225 if (ret >= 0)
226 ret += trig->subirq_base;
228 return ret;
231 static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
233 mutex_lock(&trig->pool_lock);
234 clear_bit(irq - trig->subirq_base, trig->pool);
235 mutex_unlock(&trig->pool_lock);
238 /* Complexity in here. With certain triggers (datardy) an acknowledgement
239 * may be needed if the pollfuncs do not include the data read for the
240 * triggering device.
241 * This is not currently handled. Alternative of not enabling trigger unless
242 * the relevant function is in there may be the best option.
244 /* Worth protecting against double additions? */
245 static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
246 struct iio_poll_func *pf)
248 int ret = 0;
249 bool notinuse
250 = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
252 /* Prevent the module from being removed whilst attached to a trigger */
253 __module_get(pf->indio_dev->info->driver_module);
255 /* Get irq number */
256 pf->irq = iio_trigger_get_irq(trig);
257 if (pf->irq < 0)
258 goto out_put_module;
260 /* Request irq */
261 ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
262 pf->type, pf->name,
263 pf);
264 if (ret < 0)
265 goto out_put_irq;
267 /* Enable trigger in driver */
268 if (trig->ops->set_trigger_state && notinuse) {
269 ret = trig->ops->set_trigger_state(trig, true);
270 if (ret < 0)
271 goto out_free_irq;
275 * Check if we just registered to our own trigger: we determine that
276 * this is the case if the IIO device and the trigger device share the
277 * same parent device.
279 if (pf->indio_dev->dev.parent == trig->dev.parent)
280 trig->attached_own_device = true;
282 return ret;
284 out_free_irq:
285 free_irq(pf->irq, pf);
286 out_put_irq:
287 iio_trigger_put_irq(trig, pf->irq);
288 out_put_module:
289 module_put(pf->indio_dev->info->driver_module);
290 return ret;
293 static int iio_trigger_detach_poll_func(struct iio_trigger *trig,
294 struct iio_poll_func *pf)
296 int ret = 0;
297 bool no_other_users
298 = (bitmap_weight(trig->pool,
299 CONFIG_IIO_CONSUMERS_PER_TRIGGER)
300 == 1);
301 if (trig->ops->set_trigger_state && no_other_users) {
302 ret = trig->ops->set_trigger_state(trig, false);
303 if (ret)
304 return ret;
306 if (pf->indio_dev->dev.parent == trig->dev.parent)
307 trig->attached_own_device = false;
308 iio_trigger_put_irq(trig, pf->irq);
309 free_irq(pf->irq, pf);
310 module_put(pf->indio_dev->info->driver_module);
312 return ret;
315 irqreturn_t iio_pollfunc_store_time(int irq, void *p)
317 struct iio_poll_func *pf = p;
318 pf->timestamp = iio_get_time_ns(pf->indio_dev);
319 return IRQ_WAKE_THREAD;
321 EXPORT_SYMBOL(iio_pollfunc_store_time);
323 struct iio_poll_func
324 *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
325 irqreturn_t (*thread)(int irq, void *p),
326 int type,
327 struct iio_dev *indio_dev,
328 const char *fmt,
329 ...)
331 va_list vargs;
332 struct iio_poll_func *pf;
334 pf = kmalloc(sizeof *pf, GFP_KERNEL);
335 if (pf == NULL)
336 return NULL;
337 va_start(vargs, fmt);
338 pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
339 va_end(vargs);
340 if (pf->name == NULL) {
341 kfree(pf);
342 return NULL;
344 pf->h = h;
345 pf->thread = thread;
346 pf->type = type;
347 pf->indio_dev = indio_dev;
349 return pf;
351 EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
353 void iio_dealloc_pollfunc(struct iio_poll_func *pf)
355 kfree(pf->name);
356 kfree(pf);
358 EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
361 * iio_trigger_read_current() - trigger consumer sysfs query current trigger
362 * @dev: device associated with an industrial I/O device
363 * @attr: pointer to the device_attribute structure that
364 * is being processed
365 * @buf: buffer where the current trigger name will be printed into
367 * For trigger consumers the current_trigger interface allows the trigger
368 * used by the device to be queried.
370 * Return: a negative number on failure, the number of characters written
371 * on success or 0 if no trigger is available
373 static ssize_t iio_trigger_read_current(struct device *dev,
374 struct device_attribute *attr,
375 char *buf)
377 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
379 if (indio_dev->trig)
380 return sprintf(buf, "%s\n", indio_dev->trig->name);
381 return 0;
385 * iio_trigger_write_current() - trigger consumer sysfs set current trigger
386 * @dev: device associated with an industrial I/O device
387 * @attr: device attribute that is being processed
388 * @buf: string buffer that holds the name of the trigger
389 * @len: length of the trigger name held by buf
391 * For trigger consumers the current_trigger interface allows the trigger
392 * used for this device to be specified at run time based on the trigger's
393 * name.
395 * Return: negative error code on failure or length of the buffer
396 * on success
398 static ssize_t iio_trigger_write_current(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf,
401 size_t len)
403 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
404 struct iio_trigger *oldtrig = indio_dev->trig;
405 struct iio_trigger *trig;
406 int ret;
408 mutex_lock(&indio_dev->mlock);
409 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
410 mutex_unlock(&indio_dev->mlock);
411 return -EBUSY;
413 if (indio_dev->trig_readonly) {
414 mutex_unlock(&indio_dev->mlock);
415 return -EPERM;
417 mutex_unlock(&indio_dev->mlock);
419 trig = iio_trigger_acquire_by_name(buf);
420 if (oldtrig == trig) {
421 ret = len;
422 goto out_trigger_put;
425 if (trig && indio_dev->info->validate_trigger) {
426 ret = indio_dev->info->validate_trigger(indio_dev, trig);
427 if (ret)
428 goto out_trigger_put;
431 if (trig && trig->ops->validate_device) {
432 ret = trig->ops->validate_device(trig, indio_dev);
433 if (ret)
434 goto out_trigger_put;
437 indio_dev->trig = trig;
439 if (oldtrig) {
440 if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
441 iio_trigger_detach_poll_func(oldtrig,
442 indio_dev->pollfunc_event);
443 iio_trigger_put(oldtrig);
445 if (indio_dev->trig) {
446 if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
447 iio_trigger_attach_poll_func(indio_dev->trig,
448 indio_dev->pollfunc_event);
451 return len;
453 out_trigger_put:
454 if (trig)
455 iio_trigger_put(trig);
456 return ret;
459 static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,
460 iio_trigger_read_current,
461 iio_trigger_write_current);
463 static struct attribute *iio_trigger_consumer_attrs[] = {
464 &dev_attr_current_trigger.attr,
465 NULL,
468 static const struct attribute_group iio_trigger_consumer_attr_group = {
469 .name = "trigger",
470 .attrs = iio_trigger_consumer_attrs,
473 static void iio_trig_release(struct device *device)
475 struct iio_trigger *trig = to_iio_trigger(device);
476 int i;
478 if (trig->subirq_base) {
479 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
480 irq_modify_status(trig->subirq_base + i,
481 IRQ_NOAUTOEN,
482 IRQ_NOREQUEST | IRQ_NOPROBE);
483 irq_set_chip(trig->subirq_base + i,
484 NULL);
485 irq_set_handler(trig->subirq_base + i,
486 NULL);
489 irq_free_descs(trig->subirq_base,
490 CONFIG_IIO_CONSUMERS_PER_TRIGGER);
492 kfree(trig->name);
493 kfree(trig);
496 static const struct device_type iio_trig_type = {
497 .release = iio_trig_release,
498 .groups = iio_trig_dev_groups,
501 static void iio_trig_subirqmask(struct irq_data *d)
503 struct irq_chip *chip = irq_data_get_irq_chip(d);
504 struct iio_trigger *trig
505 = container_of(chip,
506 struct iio_trigger, subirq_chip);
507 trig->subirqs[d->irq - trig->subirq_base].enabled = false;
510 static void iio_trig_subirqunmask(struct irq_data *d)
512 struct irq_chip *chip = irq_data_get_irq_chip(d);
513 struct iio_trigger *trig
514 = container_of(chip,
515 struct iio_trigger, subirq_chip);
516 trig->subirqs[d->irq - trig->subirq_base].enabled = true;
519 static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs)
521 struct iio_trigger *trig;
522 int i;
524 trig = kzalloc(sizeof *trig, GFP_KERNEL);
525 if (!trig)
526 return NULL;
528 trig->dev.type = &iio_trig_type;
529 trig->dev.bus = &iio_bus_type;
530 device_initialize(&trig->dev);
532 mutex_init(&trig->pool_lock);
533 trig->subirq_base = irq_alloc_descs(-1, 0,
534 CONFIG_IIO_CONSUMERS_PER_TRIGGER,
536 if (trig->subirq_base < 0)
537 goto free_trig;
539 trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
540 if (trig->name == NULL)
541 goto free_descs;
543 trig->subirq_chip.name = trig->name;
544 trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
545 trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
546 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
547 irq_set_chip(trig->subirq_base + i, &trig->subirq_chip);
548 irq_set_handler(trig->subirq_base + i, &handle_simple_irq);
549 irq_modify_status(trig->subirq_base + i,
550 IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
552 get_device(&trig->dev);
554 return trig;
556 free_descs:
557 irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
558 free_trig:
559 kfree(trig);
560 return NULL;
563 struct iio_trigger *iio_trigger_alloc(const char *fmt, ...)
565 struct iio_trigger *trig;
566 va_list vargs;
568 va_start(vargs, fmt);
569 trig = viio_trigger_alloc(fmt, vargs);
570 va_end(vargs);
572 return trig;
574 EXPORT_SYMBOL(iio_trigger_alloc);
576 void iio_trigger_free(struct iio_trigger *trig)
578 if (trig)
579 put_device(&trig->dev);
581 EXPORT_SYMBOL(iio_trigger_free);
583 static void devm_iio_trigger_release(struct device *dev, void *res)
585 iio_trigger_free(*(struct iio_trigger **)res);
588 static int devm_iio_trigger_match(struct device *dev, void *res, void *data)
590 struct iio_trigger **r = res;
592 if (!r || !*r) {
593 WARN_ON(!r || !*r);
594 return 0;
597 return *r == data;
601 * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc()
602 * @dev: Device to allocate iio_trigger for
603 * @fmt: trigger name format. If it includes format
604 * specifiers, the additional arguments following
605 * format are formatted and inserted in the resulting
606 * string replacing their respective specifiers.
608 * Managed iio_trigger_alloc. iio_trigger allocated with this function is
609 * automatically freed on driver detach.
611 * If an iio_trigger allocated with this function needs to be freed separately,
612 * devm_iio_trigger_free() must be used.
614 * RETURNS:
615 * Pointer to allocated iio_trigger on success, NULL on failure.
617 struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
618 const char *fmt, ...)
620 struct iio_trigger **ptr, *trig;
621 va_list vargs;
623 ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr),
624 GFP_KERNEL);
625 if (!ptr)
626 return NULL;
628 /* use raw alloc_dr for kmalloc caller tracing */
629 va_start(vargs, fmt);
630 trig = viio_trigger_alloc(fmt, vargs);
631 va_end(vargs);
632 if (trig) {
633 *ptr = trig;
634 devres_add(dev, ptr);
635 } else {
636 devres_free(ptr);
639 return trig;
641 EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc);
644 * devm_iio_trigger_free - Resource-managed iio_trigger_free()
645 * @dev: Device this iio_dev belongs to
646 * @iio_trig: the iio_trigger associated with the device
648 * Free iio_trigger allocated with devm_iio_trigger_alloc().
650 void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig)
652 int rc;
654 rc = devres_release(dev, devm_iio_trigger_release,
655 devm_iio_trigger_match, iio_trig);
656 WARN_ON(rc);
658 EXPORT_SYMBOL_GPL(devm_iio_trigger_free);
660 static void devm_iio_trigger_unreg(struct device *dev, void *res)
662 iio_trigger_unregister(*(struct iio_trigger **)res);
666 * devm_iio_trigger_register - Resource-managed iio_trigger_register()
667 * @dev: device this trigger was allocated for
668 * @trig_info: trigger to register
670 * Managed iio_trigger_register(). The IIO trigger registered with this
671 * function is automatically unregistered on driver detach. This function
672 * calls iio_trigger_register() internally. Refer to that function for more
673 * information.
675 * If an iio_trigger registered with this function needs to be unregistered
676 * separately, devm_iio_trigger_unregister() must be used.
678 * RETURNS:
679 * 0 on success, negative error number on failure.
681 int devm_iio_trigger_register(struct device *dev, struct iio_trigger *trig_info)
683 struct iio_trigger **ptr;
684 int ret;
686 ptr = devres_alloc(devm_iio_trigger_unreg, sizeof(*ptr), GFP_KERNEL);
687 if (!ptr)
688 return -ENOMEM;
690 *ptr = trig_info;
691 ret = iio_trigger_register(trig_info);
692 if (!ret)
693 devres_add(dev, ptr);
694 else
695 devres_free(ptr);
697 return ret;
699 EXPORT_SYMBOL_GPL(devm_iio_trigger_register);
702 * devm_iio_trigger_unregister - Resource-managed iio_trigger_unregister()
703 * @dev: device this iio_trigger belongs to
704 * @trig_info: the trigger associated with the device
706 * Unregister trigger registered with devm_iio_trigger_register().
708 void devm_iio_trigger_unregister(struct device *dev,
709 struct iio_trigger *trig_info)
711 int rc;
713 rc = devres_release(dev, devm_iio_trigger_unreg, devm_iio_trigger_match,
714 trig_info);
715 WARN_ON(rc);
717 EXPORT_SYMBOL_GPL(devm_iio_trigger_unregister);
719 bool iio_trigger_using_own(struct iio_dev *indio_dev)
721 return indio_dev->trig->attached_own_device;
723 EXPORT_SYMBOL(iio_trigger_using_own);
726 * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
727 * the same device
728 * @trig: The IIO trigger to check
729 * @indio_dev: the IIO device to check
731 * This function can be used as the validate_device callback for triggers that
732 * can only be attached to their own device.
734 * Return: 0 if both the trigger and the IIO device belong to the same
735 * device, -EINVAL otherwise.
737 int iio_trigger_validate_own_device(struct iio_trigger *trig,
738 struct iio_dev *indio_dev)
740 if (indio_dev->dev.parent != trig->dev.parent)
741 return -EINVAL;
742 return 0;
744 EXPORT_SYMBOL(iio_trigger_validate_own_device);
746 void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
748 indio_dev->groups[indio_dev->groupcounter++] =
749 &iio_trigger_consumer_attr_group;
752 void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
754 /* Clean up an associated but not attached trigger reference */
755 if (indio_dev->trig)
756 iio_trigger_put(indio_dev->trig);
759 int iio_triggered_buffer_postenable(struct iio_dev *indio_dev)
761 return iio_trigger_attach_poll_func(indio_dev->trig,
762 indio_dev->pollfunc);
764 EXPORT_SYMBOL(iio_triggered_buffer_postenable);
766 int iio_triggered_buffer_predisable(struct iio_dev *indio_dev)
768 return iio_trigger_detach_poll_func(indio_dev->trig,
769 indio_dev->pollfunc);
771 EXPORT_SYMBOL(iio_triggered_buffer_predisable);