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![Nuno Sá](/assets/img/avatar_default.png)
Now that there are no more users accessing 'mlock' directly, we can move it to the iio_dev private structure. Hence, it's now explicit that new driver's should not directly use this lock. Signed-off-by: Nuno Sá <nuno.sa@analog.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20221012151620.1725215-5-nuno.sa@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
750 lines
20 KiB
C
750 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* The industrial I/O core, trigger handling functions
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*
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* Copyright (c) 2008 Jonathan Cameron
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*/
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#include <linux/kernel.h>
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#include <linux/idr.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/iio-opaque.h>
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#include <linux/iio/trigger.h>
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#include "iio_core.h"
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#include "iio_core_trigger.h"
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#include <linux/iio/trigger_consumer.h>
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/* RFC - Question of approach
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* Make the common case (single sensor single trigger)
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* simple by starting trigger capture from when first sensors
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* is added.
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*
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* Complex simultaneous start requires use of 'hold' functionality
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* of the trigger. (not implemented)
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*
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* Any other suggestions?
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*/
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static DEFINE_IDA(iio_trigger_ida);
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/* Single list of all available triggers */
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static LIST_HEAD(iio_trigger_list);
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static DEFINE_MUTEX(iio_trigger_list_lock);
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/**
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* name_show() - retrieve useful identifying name
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* @dev: device associated with the iio_trigger
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* @attr: pointer to the device_attribute structure that is
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* being processed
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* @buf: buffer to print the name into
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*
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* Return: a negative number on failure or the number of written
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* characters on success.
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*/
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static ssize_t name_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct iio_trigger *trig = to_iio_trigger(dev);
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return sysfs_emit(buf, "%s\n", trig->name);
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}
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static DEVICE_ATTR_RO(name);
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static struct attribute *iio_trig_dev_attrs[] = {
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&dev_attr_name.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(iio_trig_dev);
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static struct iio_trigger *__iio_trigger_find_by_name(const char *name);
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int iio_trigger_register(struct iio_trigger *trig_info)
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{
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int ret;
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trig_info->id = ida_alloc(&iio_trigger_ida, GFP_KERNEL);
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if (trig_info->id < 0)
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return trig_info->id;
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/* Set the name used for the sysfs directory etc */
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dev_set_name(&trig_info->dev, "trigger%d", trig_info->id);
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ret = device_add(&trig_info->dev);
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if (ret)
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goto error_unregister_id;
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/* Add to list of available triggers held by the IIO core */
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mutex_lock(&iio_trigger_list_lock);
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if (__iio_trigger_find_by_name(trig_info->name)) {
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pr_err("Duplicate trigger name '%s'\n", trig_info->name);
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ret = -EEXIST;
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goto error_device_del;
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}
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list_add_tail(&trig_info->list, &iio_trigger_list);
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mutex_unlock(&iio_trigger_list_lock);
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return 0;
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error_device_del:
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mutex_unlock(&iio_trigger_list_lock);
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device_del(&trig_info->dev);
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error_unregister_id:
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ida_free(&iio_trigger_ida, trig_info->id);
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return ret;
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}
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EXPORT_SYMBOL(iio_trigger_register);
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void iio_trigger_unregister(struct iio_trigger *trig_info)
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{
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mutex_lock(&iio_trigger_list_lock);
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list_del(&trig_info->list);
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mutex_unlock(&iio_trigger_list_lock);
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ida_free(&iio_trigger_ida, trig_info->id);
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/* Possible issue in here */
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device_del(&trig_info->dev);
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}
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EXPORT_SYMBOL(iio_trigger_unregister);
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int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig)
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{
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struct iio_dev_opaque *iio_dev_opaque;
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if (!indio_dev || !trig)
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return -EINVAL;
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iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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mutex_lock(&iio_dev_opaque->mlock);
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WARN_ON(iio_dev_opaque->trig_readonly);
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indio_dev->trig = iio_trigger_get(trig);
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iio_dev_opaque->trig_readonly = true;
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mutex_unlock(&iio_dev_opaque->mlock);
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return 0;
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}
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EXPORT_SYMBOL(iio_trigger_set_immutable);
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/* Search for trigger by name, assuming iio_trigger_list_lock held */
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static struct iio_trigger *__iio_trigger_find_by_name(const char *name)
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{
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struct iio_trigger *iter;
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list_for_each_entry(iter, &iio_trigger_list, list)
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if (!strcmp(iter->name, name))
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return iter;
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return NULL;
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}
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static struct iio_trigger *iio_trigger_acquire_by_name(const char *name)
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{
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struct iio_trigger *trig = NULL, *iter;
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mutex_lock(&iio_trigger_list_lock);
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list_for_each_entry(iter, &iio_trigger_list, list)
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if (sysfs_streq(iter->name, name)) {
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trig = iter;
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iio_trigger_get(trig);
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break;
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}
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mutex_unlock(&iio_trigger_list_lock);
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return trig;
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}
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static void iio_reenable_work_fn(struct work_struct *work)
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{
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struct iio_trigger *trig = container_of(work, struct iio_trigger,
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reenable_work);
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/*
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* This 'might' occur after the trigger state is set to disabled -
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* in that case the driver should skip reenabling.
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*/
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trig->ops->reenable(trig);
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}
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/*
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* In general, reenable callbacks may need to sleep and this path is
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* not performance sensitive, so just queue up a work item
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* to reneable the trigger for us.
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*
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* Races that can cause this.
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* 1) A handler occurs entirely in interrupt context so the counter
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* the final decrement is still in this interrupt.
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* 2) The trigger has been removed, but one last interrupt gets through.
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*
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* For (1) we must call reenable, but not in atomic context.
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* For (2) it should be safe to call reenanble, if drivers never blindly
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* reenable after state is off.
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*/
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static void iio_trigger_notify_done_atomic(struct iio_trigger *trig)
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{
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if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
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trig->ops->reenable)
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schedule_work(&trig->reenable_work);
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}
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void iio_trigger_poll(struct iio_trigger *trig)
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{
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int i;
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if (!atomic_read(&trig->use_count)) {
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atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
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if (trig->subirqs[i].enabled)
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generic_handle_irq(trig->subirq_base + i);
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else
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iio_trigger_notify_done_atomic(trig);
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}
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}
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}
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EXPORT_SYMBOL(iio_trigger_poll);
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irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
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{
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iio_trigger_poll(private);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
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void iio_trigger_poll_chained(struct iio_trigger *trig)
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{
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int i;
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if (!atomic_read(&trig->use_count)) {
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atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
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if (trig->subirqs[i].enabled)
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handle_nested_irq(trig->subirq_base + i);
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else
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iio_trigger_notify_done(trig);
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}
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}
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}
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EXPORT_SYMBOL(iio_trigger_poll_chained);
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void iio_trigger_notify_done(struct iio_trigger *trig)
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{
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if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
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trig->ops->reenable)
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trig->ops->reenable(trig);
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}
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EXPORT_SYMBOL(iio_trigger_notify_done);
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/* Trigger Consumer related functions */
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static int iio_trigger_get_irq(struct iio_trigger *trig)
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{
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int ret;
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mutex_lock(&trig->pool_lock);
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ret = bitmap_find_free_region(trig->pool,
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CONFIG_IIO_CONSUMERS_PER_TRIGGER,
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ilog2(1));
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mutex_unlock(&trig->pool_lock);
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if (ret >= 0)
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ret += trig->subirq_base;
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return ret;
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}
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static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
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{
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mutex_lock(&trig->pool_lock);
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clear_bit(irq - trig->subirq_base, trig->pool);
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mutex_unlock(&trig->pool_lock);
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}
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/* Complexity in here. With certain triggers (datardy) an acknowledgement
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* may be needed if the pollfuncs do not include the data read for the
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* triggering device.
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* This is not currently handled. Alternative of not enabling trigger unless
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* the relevant function is in there may be the best option.
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*/
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/* Worth protecting against double additions? */
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int iio_trigger_attach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev);
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bool notinuse =
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bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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int ret = 0;
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/* Prevent the module from being removed whilst attached to a trigger */
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__module_get(iio_dev_opaque->driver_module);
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/* Get irq number */
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pf->irq = iio_trigger_get_irq(trig);
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if (pf->irq < 0) {
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pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n",
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trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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goto out_put_module;
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}
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/* Request irq */
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ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
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pf->type, pf->name,
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pf);
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if (ret < 0)
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goto out_put_irq;
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/* Enable trigger in driver */
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if (trig->ops && trig->ops->set_trigger_state && notinuse) {
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ret = trig->ops->set_trigger_state(trig, true);
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if (ret < 0)
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goto out_free_irq;
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}
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/*
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* Check if we just registered to our own trigger: we determine that
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* this is the case if the IIO device and the trigger device share the
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* same parent device.
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*/
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if (pf->indio_dev->dev.parent == trig->dev.parent)
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trig->attached_own_device = true;
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return ret;
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out_free_irq:
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free_irq(pf->irq, pf);
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out_put_irq:
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iio_trigger_put_irq(trig, pf->irq);
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out_put_module:
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module_put(iio_dev_opaque->driver_module);
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return ret;
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}
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int iio_trigger_detach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev);
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bool no_other_users =
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bitmap_weight(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER) == 1;
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int ret = 0;
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if (trig->ops && trig->ops->set_trigger_state && no_other_users) {
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ret = trig->ops->set_trigger_state(trig, false);
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if (ret)
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return ret;
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}
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if (pf->indio_dev->dev.parent == trig->dev.parent)
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trig->attached_own_device = false;
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iio_trigger_put_irq(trig, pf->irq);
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free_irq(pf->irq, pf);
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module_put(iio_dev_opaque->driver_module);
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return ret;
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}
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irqreturn_t iio_pollfunc_store_time(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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pf->timestamp = iio_get_time_ns(pf->indio_dev);
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return IRQ_WAKE_THREAD;
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}
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EXPORT_SYMBOL(iio_pollfunc_store_time);
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struct iio_poll_func
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*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
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irqreturn_t (*thread)(int irq, void *p),
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int type,
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struct iio_dev *indio_dev,
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const char *fmt,
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...)
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{
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va_list vargs;
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struct iio_poll_func *pf;
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pf = kmalloc(sizeof(*pf), GFP_KERNEL);
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if (!pf)
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return NULL;
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va_start(vargs, fmt);
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pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
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va_end(vargs);
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if (pf->name == NULL) {
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kfree(pf);
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return NULL;
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}
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pf->h = h;
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pf->thread = thread;
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pf->type = type;
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pf->indio_dev = indio_dev;
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return pf;
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}
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EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
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void iio_dealloc_pollfunc(struct iio_poll_func *pf)
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{
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kfree(pf->name);
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kfree(pf);
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}
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EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
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/**
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* current_trigger_show() - trigger consumer sysfs query current trigger
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* @dev: device associated with an industrial I/O device
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* @attr: pointer to the device_attribute structure that
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* is being processed
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* @buf: buffer where the current trigger name will be printed into
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*
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* For trigger consumers the current_trigger interface allows the trigger
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* used by the device to be queried.
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*
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* Return: a negative number on failure, the number of characters written
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* on success or 0 if no trigger is available
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*/
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static ssize_t current_trigger_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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if (indio_dev->trig)
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return sysfs_emit(buf, "%s\n", indio_dev->trig->name);
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return 0;
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}
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/**
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* current_trigger_store() - trigger consumer sysfs set current trigger
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* @dev: device associated with an industrial I/O device
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* @attr: device attribute that is being processed
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* @buf: string buffer that holds the name of the trigger
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* @len: length of the trigger name held by buf
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*
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* For trigger consumers the current_trigger interface allows the trigger
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* used for this device to be specified at run time based on the trigger's
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* name.
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*
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* Return: negative error code on failure or length of the buffer
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* on success
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*/
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static ssize_t current_trigger_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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struct iio_trigger *oldtrig = indio_dev->trig;
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struct iio_trigger *trig;
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int ret;
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mutex_lock(&iio_dev_opaque->mlock);
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if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) {
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mutex_unlock(&iio_dev_opaque->mlock);
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return -EBUSY;
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}
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if (iio_dev_opaque->trig_readonly) {
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mutex_unlock(&iio_dev_opaque->mlock);
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return -EPERM;
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}
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mutex_unlock(&iio_dev_opaque->mlock);
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trig = iio_trigger_acquire_by_name(buf);
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if (oldtrig == trig) {
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ret = len;
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goto out_trigger_put;
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}
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if (trig && indio_dev->info->validate_trigger) {
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ret = indio_dev->info->validate_trigger(indio_dev, trig);
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if (ret)
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goto out_trigger_put;
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}
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if (trig && trig->ops && trig->ops->validate_device) {
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ret = trig->ops->validate_device(trig, indio_dev);
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if (ret)
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goto out_trigger_put;
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}
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indio_dev->trig = trig;
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if (oldtrig) {
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if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
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iio_trigger_detach_poll_func(oldtrig,
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indio_dev->pollfunc_event);
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iio_trigger_put(oldtrig);
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}
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if (indio_dev->trig) {
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if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
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iio_trigger_attach_poll_func(indio_dev->trig,
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indio_dev->pollfunc_event);
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}
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return len;
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out_trigger_put:
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if (trig)
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iio_trigger_put(trig);
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return ret;
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}
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static DEVICE_ATTR_RW(current_trigger);
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static struct attribute *iio_trigger_consumer_attrs[] = {
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&dev_attr_current_trigger.attr,
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NULL,
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};
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static const struct attribute_group iio_trigger_consumer_attr_group = {
|
|
.name = "trigger",
|
|
.attrs = iio_trigger_consumer_attrs,
|
|
};
|
|
|
|
static void iio_trig_release(struct device *device)
|
|
{
|
|
struct iio_trigger *trig = to_iio_trigger(device);
|
|
int i;
|
|
|
|
if (trig->subirq_base) {
|
|
for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
|
|
irq_modify_status(trig->subirq_base + i,
|
|
IRQ_NOAUTOEN,
|
|
IRQ_NOREQUEST | IRQ_NOPROBE);
|
|
irq_set_chip(trig->subirq_base + i,
|
|
NULL);
|
|
irq_set_handler(trig->subirq_base + i,
|
|
NULL);
|
|
}
|
|
|
|
irq_free_descs(trig->subirq_base,
|
|
CONFIG_IIO_CONSUMERS_PER_TRIGGER);
|
|
}
|
|
kfree(trig->name);
|
|
kfree(trig);
|
|
}
|
|
|
|
static const struct device_type iio_trig_type = {
|
|
.release = iio_trig_release,
|
|
.groups = iio_trig_dev_groups,
|
|
};
|
|
|
|
static void iio_trig_subirqmask(struct irq_data *d)
|
|
{
|
|
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
|
struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip);
|
|
|
|
trig->subirqs[d->irq - trig->subirq_base].enabled = false;
|
|
}
|
|
|
|
static void iio_trig_subirqunmask(struct irq_data *d)
|
|
{
|
|
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
|
struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip);
|
|
|
|
trig->subirqs[d->irq - trig->subirq_base].enabled = true;
|
|
}
|
|
|
|
static __printf(3, 0)
|
|
struct iio_trigger *viio_trigger_alloc(struct device *parent,
|
|
struct module *this_mod,
|
|
const char *fmt,
|
|
va_list vargs)
|
|
{
|
|
struct iio_trigger *trig;
|
|
int i;
|
|
|
|
trig = kzalloc(sizeof(*trig), GFP_KERNEL);
|
|
if (!trig)
|
|
return NULL;
|
|
|
|
trig->dev.parent = parent;
|
|
trig->dev.type = &iio_trig_type;
|
|
trig->dev.bus = &iio_bus_type;
|
|
device_initialize(&trig->dev);
|
|
INIT_WORK(&trig->reenable_work, iio_reenable_work_fn);
|
|
|
|
mutex_init(&trig->pool_lock);
|
|
trig->subirq_base = irq_alloc_descs(-1, 0,
|
|
CONFIG_IIO_CONSUMERS_PER_TRIGGER,
|
|
0);
|
|
if (trig->subirq_base < 0)
|
|
goto free_trig;
|
|
|
|
trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
|
|
if (trig->name == NULL)
|
|
goto free_descs;
|
|
|
|
INIT_LIST_HEAD(&trig->list);
|
|
|
|
trig->owner = this_mod;
|
|
|
|
trig->subirq_chip.name = trig->name;
|
|
trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
|
|
trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
|
|
for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
|
|
irq_set_chip(trig->subirq_base + i, &trig->subirq_chip);
|
|
irq_set_handler(trig->subirq_base + i, &handle_simple_irq);
|
|
irq_modify_status(trig->subirq_base + i,
|
|
IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
|
|
}
|
|
|
|
return trig;
|
|
|
|
free_descs:
|
|
irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
|
|
free_trig:
|
|
kfree(trig);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __iio_trigger_alloc - Allocate a trigger
|
|
* @parent: Device to allocate iio_trigger for
|
|
* @this_mod: module allocating the trigger
|
|
* @fmt: trigger name format. If it includes format
|
|
* specifiers, the additional arguments following
|
|
* format are formatted and inserted in the resulting
|
|
* string replacing their respective specifiers.
|
|
* RETURNS:
|
|
* Pointer to allocated iio_trigger on success, NULL on failure.
|
|
*/
|
|
struct iio_trigger *__iio_trigger_alloc(struct device *parent,
|
|
struct module *this_mod,
|
|
const char *fmt, ...)
|
|
{
|
|
struct iio_trigger *trig;
|
|
va_list vargs;
|
|
|
|
va_start(vargs, fmt);
|
|
trig = viio_trigger_alloc(parent, this_mod, fmt, vargs);
|
|
va_end(vargs);
|
|
|
|
return trig;
|
|
}
|
|
EXPORT_SYMBOL(__iio_trigger_alloc);
|
|
|
|
void iio_trigger_free(struct iio_trigger *trig)
|
|
{
|
|
if (trig)
|
|
put_device(&trig->dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_free);
|
|
|
|
static void devm_iio_trigger_release(struct device *dev, void *res)
|
|
{
|
|
iio_trigger_free(*(struct iio_trigger **)res);
|
|
}
|
|
|
|
/**
|
|
* __devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc()
|
|
* Managed iio_trigger_alloc. iio_trigger allocated with this function is
|
|
* automatically freed on driver detach.
|
|
* @parent: Device to allocate iio_trigger for
|
|
* @this_mod: module allocating the trigger
|
|
* @fmt: trigger name format. If it includes format
|
|
* specifiers, the additional arguments following
|
|
* format are formatted and inserted in the resulting
|
|
* string replacing their respective specifiers.
|
|
*
|
|
*
|
|
* RETURNS:
|
|
* Pointer to allocated iio_trigger on success, NULL on failure.
|
|
*/
|
|
struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent,
|
|
struct module *this_mod,
|
|
const char *fmt, ...)
|
|
{
|
|
struct iio_trigger **ptr, *trig;
|
|
va_list vargs;
|
|
|
|
ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
/* use raw alloc_dr for kmalloc caller tracing */
|
|
va_start(vargs, fmt);
|
|
trig = viio_trigger_alloc(parent, this_mod, fmt, vargs);
|
|
va_end(vargs);
|
|
if (trig) {
|
|
*ptr = trig;
|
|
devres_add(parent, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return trig;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__devm_iio_trigger_alloc);
|
|
|
|
static void devm_iio_trigger_unreg(void *trigger_info)
|
|
{
|
|
iio_trigger_unregister(trigger_info);
|
|
}
|
|
|
|
/**
|
|
* devm_iio_trigger_register - Resource-managed iio_trigger_register()
|
|
* @dev: device this trigger was allocated for
|
|
* @trig_info: trigger to register
|
|
*
|
|
* Managed iio_trigger_register(). The IIO trigger registered with this
|
|
* function is automatically unregistered on driver detach. This function
|
|
* calls iio_trigger_register() internally. Refer to that function for more
|
|
* information.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, negative error number on failure.
|
|
*/
|
|
int devm_iio_trigger_register(struct device *dev,
|
|
struct iio_trigger *trig_info)
|
|
{
|
|
int ret;
|
|
|
|
ret = iio_trigger_register(trig_info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_add_action_or_reset(dev, devm_iio_trigger_unreg, trig_info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_trigger_register);
|
|
|
|
bool iio_trigger_using_own(struct iio_dev *indio_dev)
|
|
{
|
|
return indio_dev->trig->attached_own_device;
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_using_own);
|
|
|
|
/**
|
|
* iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
|
|
* the same device
|
|
* @trig: The IIO trigger to check
|
|
* @indio_dev: the IIO device to check
|
|
*
|
|
* This function can be used as the validate_device callback for triggers that
|
|
* can only be attached to their own device.
|
|
*
|
|
* Return: 0 if both the trigger and the IIO device belong to the same
|
|
* device, -EINVAL otherwise.
|
|
*/
|
|
int iio_trigger_validate_own_device(struct iio_trigger *trig,
|
|
struct iio_dev *indio_dev)
|
|
{
|
|
if (indio_dev->dev.parent != trig->dev.parent)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_validate_own_device);
|
|
|
|
int iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
|
|
{
|
|
return iio_device_register_sysfs_group(indio_dev,
|
|
&iio_trigger_consumer_attr_group);
|
|
}
|
|
|
|
void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
|
|
{
|
|
/* Clean up an associated but not attached trigger reference */
|
|
if (indio_dev->trig)
|
|
iio_trigger_put(indio_dev->trig);
|
|
}
|