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/** * The industrial I/O periodic hrtimer trigger driver * * Copyright (C) Intuitive Aerial AB * Written by Marten Svanfeldt, marten@intuitiveaerial.com * Copyright (C) 2012, Analog Device Inc. * Author: Lars-Peter Clausen <lars@metafoo.de> * Copyright (C) 2015, Intel Corporation * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * *//* default sampling frequency - 100Hz */struct iio_hrtimer_info { struct iio_sw_trigger swt; struct hrtimer timer; unsigned long sampling_frequency; ktime_t period;};static const struct config_item_type iio_hrtimer_type = { .ct_owner = THIS_MODULE,};staticssize_t iio_hrtimer_show_sampling_frequency(struct device *dev, struct device_attribute *attr, char *buf){ struct iio_trigger *trig = to_iio_trigger(dev); struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig); return snprintf(buf, PAGE_SIZE, "%lu\n", info->sampling_frequency);}staticssize_t iio_hrtimer_store_sampling_frequency(struct device *dev, struct device_attribute *attr, const char *buf, size_t len){ struct iio_trigger *trig = to_iio_trigger(dev); struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig); unsigned long val; int ret; ret = kstrtoul(buf, 10, &val); if (ret) return ret; if (!val || val > NSEC_PER_SEC) return -EINVAL; info->sampling_frequency = val; info->period = NSEC_PER_SEC / val; return len;}static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR, iio_hrtimer_show_sampling_frequency, iio_hrtimer_store_sampling_frequency);static struct attribute *iio_hrtimer_attrs[] = { &dev_attr_sampling_frequency.attr, NULL};static const struct attribute_group iio_hrtimer_attr_group = { .attrs = iio_hrtimer_attrs,};static const struct attribute_group *iio_hrtimer_attr_groups[] = { &iio_hrtimer_attr_group, NULL};static enum hrtimer_restart iio_hrtimer_trig_handler(struct hrtimer *timer){ struct iio_hrtimer_info *info;