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Release 4.7 drivers/iio/trigger/iio-trig-hrtimer.c

/**
 * 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.
 *
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hrtimer.h>

#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/sw_trigger.h>

/* default sampling frequency - 100Hz */

#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100


struct iio_hrtimer_info {
	
struct iio_sw_trigger swt;
	
struct hrtimer timer;
	
unsigned long sampling_frequency;
	
ktime_t period;
};


static struct config_item_type iio_hrtimer_type = {
	.ct_owner = THIS_MODULE,
};


static ssize_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); }

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static ssize_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 = ktime_set(0, NSEC_PER_SEC / val); return len; }

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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; info = container_of(timer, struct iio_hrtimer_info, timer); hrtimer_forward_now(timer, info->period); iio_trigger_poll(info->swt.trigger); return HRTIMER_RESTART; }

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static int iio_trig_hrtimer_set_state(struct iio_trigger *trig, bool state) { struct iio_hrtimer_info *trig_info; trig_info = iio_trigger_get_drvdata(trig); if (state) hrtimer_start(&trig_info->timer, trig_info->period, HRTIMER_MODE_REL); else hrtimer_cancel(&trig_info->timer); return 0; }

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static const struct iio_trigger_ops iio_hrtimer_trigger_ops = { .owner = THIS_MODULE, .set_trigger_state = iio_trig_hrtimer_set_state, };
static struct iio_sw_trigger *iio_trig_hrtimer_probe(const char *name) { struct iio_hrtimer_info *trig_info; int ret; trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL); if (!trig_info) return ERR_PTR(-ENOMEM); trig_info->swt.trigger = iio_trigger_alloc("%s", name); if (!trig_info->swt.trigger) { ret = -ENOMEM; goto err_free_trig_info; } iio_trigger_set_drvdata(trig_info->swt.trigger, trig_info); trig_info->swt.trigger->ops = &iio_hrtimer_trigger_ops; trig_info->swt.trigger->dev.groups = iio_hrtimer_attr_groups; hrtimer_init(&trig_info->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); trig_info->timer.function = iio_hrtimer_trig_handler; trig_info->sampling_frequency = HRTIMER_DEFAULT_SAMPLING_FREQUENCY; trig_info->period = ktime_set(0, NSEC_PER_SEC / trig_info->sampling_frequency); ret = iio_trigger_register(trig_info->swt.trigger); if (ret) goto err_free_trigger; iio_swt_group_init_type_name(&trig_info->swt, name, &iio_hrtimer_type); return &trig_info->swt; err_free_trigger: iio_trigger_free(trig_info->swt.trigger); err_free_trig_info: kfree(trig_info); return ERR_PTR(ret); }

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static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt) { struct iio_hrtimer_info *trig_info; trig_info = iio_trigger_get_drvdata(swt->trigger); iio_trigger_unregister(swt->trigger); /* cancel the timer after unreg to make sure no one rearms it */ hrtimer_cancel(&trig_info->timer); iio_trigger_free(swt->trigger); kfree(trig_info); return 0; }

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static const struct iio_sw_trigger_ops iio_trig_hrtimer_ops = { .probe = iio_trig_hrtimer_probe, .remove = iio_trig_hrtimer_remove, }; static struct iio_sw_trigger_type iio_trig_hrtimer = { .name = "hrtimer", .owner = THIS_MODULE, .ops = &iio_trig_hrtimer_ops, }; module_iio_sw_trigger_driver(iio_trig_hrtimer); MODULE_AUTHOR("Marten Svanfeldt <marten@intuitiveaerial.com>"); MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); MODULE_DESCRIPTION("Periodic hrtimer trigger for the IIO subsystem"); MODULE_LICENSE("GPL v2");

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