[deliverable/linux.git] / drivers / iio / industrialio-event.c

/* Industrial I/O event handling
 *
 * Copyright (c) 2008 Jonathan Cameron
 *
 * 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.
 *
 * Based on elements of hwmon and input subsystems.
 */

#include <linux/anon_inodes.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/kfifo.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <linux/iio/iio.h>
#include "iio_core.h"
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>

/**
 * struct iio_event_interface - chrdev interface for an event line
 * @wait:		wait queue to allow blocking reads of events
 * @det_events:		list of detected events
 * @dev_attr_list:	list of event interface sysfs attribute
 * @flags:		file operations related flags including busy flag.
 * @group:		event interface sysfs attribute group
 */
struct iio_event_interface {
	wait_queue_head_t	wait;
	DECLARE_KFIFO(det_events, struct iio_event_data, 16);

	struct list_head	dev_attr_list;
	unsigned long		flags;
	struct attribute_group	group;
	struct mutex		read_lock;
};

/**
 * iio_push_event() - try to add event to the list for userspace reading
 * @indio_dev:		IIO device structure
 * @ev_code:		What event
 * @timestamp:		When the event occurred
 *
 * Note: The caller must make sure that this function is not running
 * concurrently for the same indio_dev more than once.
 **/
int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
{
	struct iio_event_interface *ev_int = indio_dev->event_interface;
	struct iio_event_data ev;
	int copied;

	/* Does anyone care? */
	if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {

		ev.id = ev_code;
		ev.timestamp = timestamp;

		copied = kfifo_put(&ev_int->det_events, ev);
		if (copied != 0)
			wake_up_poll(&ev_int->wait, POLLIN);
	}

	return 0;
}
EXPORT_SYMBOL(iio_push_event);

/**
 * iio_event_poll() - poll the event queue to find out if it has data
 */
static unsigned int iio_event_poll(struct file *filep,
			     struct poll_table_struct *wait)
{
	struct iio_dev *indio_dev = filep->private_data;
	struct iio_event_interface *ev_int = indio_dev->event_interface;
	unsigned int events = 0;

	if (!indio_dev->info)
		return -ENODEV;

	poll_wait(filep, &ev_int->wait, wait);

	if (!kfifo_is_empty(&ev_int->det_events))
		events = POLLIN | POLLRDNORM;

	return events;
}

static ssize_t iio_event_chrdev_read(struct file *filep,
				     char __user *buf,
				     size_t count,
				     loff_t *f_ps)
{
	struct iio_dev *indio_dev = filep->private_data;
	struct iio_event_interface *ev_int = indio_dev->event_interface;
	unsigned int copied;
	int ret;

	if (!indio_dev->info)
		return -ENODEV;

	if (count < sizeof(struct iio_event_data))
		return -EINVAL;

	do {
		if (kfifo_is_empty(&ev_int->det_events)) {
			if (filep->f_flags & O_NONBLOCK)
				return -EAGAIN;

			ret = wait_event_interruptible(ev_int->wait,
					!kfifo_is_empty(&ev_int->det_events) ||
					indio_dev->info == NULL);
			if (ret)
				return ret;
			if (indio_dev->info == NULL)
				return -ENODEV;
		}

		if (mutex_lock_interruptible(&ev_int->read_lock))
			return -ERESTARTSYS;
		ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied);
		mutex_unlock(&ev_int->read_lock);

		if (ret)
			return ret;

		/*
		 * If we couldn't read anything from the fifo (a different
		 * thread might have been faster) we either return -EAGAIN if
		 * the file descriptor is non-blocking, otherwise we go back to
		 * sleep and wait for more data to arrive.
		 */
		if (copied == 0 && (filep->f_flags & O_NONBLOCK))
			return -EAGAIN;

	} while (copied == 0);

	return copied;
}

static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
{
	struct iio_dev *indio_dev = filep->private_data;
	struct iio_event_interface *ev_int = indio_dev->event_interface;

	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);

	iio_device_put(indio_dev);

	return 0;
}

static const struct file_operations iio_event_chrdev_fileops = {
	.read =  iio_event_chrdev_read,
	.poll =  iio_event_poll,
	.release = iio_event_chrdev_release,
	.owner = THIS_MODULE,
	.llseek = noop_llseek,
};

int iio_event_getfd(struct iio_dev *indio_dev)
{
	struct iio_event_interface *ev_int = indio_dev->event_interface;
	int fd;

	if (ev_int == NULL)
		return -ENODEV;

	if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags))
		return -EBUSY;

	iio_device_get(indio_dev);

	fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops,
				indio_dev, O_RDONLY | O_CLOEXEC);
	if (fd < 0) {
		clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
		iio_device_put(indio_dev);
	} else {
		kfifo_reset_out(&ev_int->det_events);
	}

	return fd;
}

static const char * const iio_ev_type_text[] = {
	[IIO_EV_TYPE_THRESH] = "thresh",
	[IIO_EV_TYPE_MAG] = "mag",
	[IIO_EV_TYPE_ROC] = "roc",
	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
	[IIO_EV_TYPE_INSTANCE] = "instance",
};

static const char * const iio_ev_dir_text[] = {
	[IIO_EV_DIR_EITHER] = "either",
	[IIO_EV_DIR_RISING] = "rising",
	[IIO_EV_DIR_FALLING] = "falling"
};

static const char * const iio_ev_info_text[] = {
	[IIO_EV_INFO_ENABLE] = "en",
	[IIO_EV_INFO_VALUE] = "value",
	[IIO_EV_INFO_HYSTERESIS] = "hysteresis",
	[IIO_EV_INFO_PERIOD] = "period",
};

static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr)
{
	return attr->c->event_spec[attr->address & 0xffff].dir;
}

static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr)
{
	return attr->c->event_spec[attr->address & 0xffff].type;
}

static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr)
{
	return (attr->address >> 16) & 0xffff;
}

static ssize_t iio_ev_state_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf,
				  size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	int ret;
	bool val;

	ret = strtobool(buf, &val);
	if (ret < 0)
		return ret;

	ret = indio_dev->info->write_event_config(indio_dev,
		this_attr->c, iio_ev_attr_type(this_attr),
		iio_ev_attr_dir(this_attr), val);

	return (ret < 0) ? ret : len;
}

static ssize_t iio_ev_state_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	int val;

	val = indio_dev->info->read_event_config(indio_dev,
		this_attr->c, iio_ev_attr_type(this_attr),
		iio_ev_attr_dir(this_attr));
	if (val < 0)
		return val;
	else
		return sprintf(buf, "%d\n", val);
}

static ssize_t iio_ev_value_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	int val, val2, val_arr[2];
	int ret;

	ret = indio_dev->info->read_event_value(indio_dev,
		this_attr->c, iio_ev_attr_type(this_attr),
		iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr),
		&val, &val2);
	if (ret < 0)
		return ret;
	val_arr[0] = val;
	val_arr[1] = val2;
	return iio_format_value(buf, ret, 2, val_arr);
}

static ssize_t iio_ev_value_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf,
				  size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	int val, val2;
	int ret;

	if (!indio_dev->info->write_event_value)
		return -EINVAL;

	ret = iio_str_to_fixpoint(buf, 100000, &val, &val2);
	if (ret)
		return ret;
	ret = indio_dev->info->write_event_value(indio_dev,
		this_attr->c, iio_ev_attr_type(this_attr),
		iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr),
		val, val2);
	if (ret < 0)
		return ret;

	return len;
}

static int iio_device_add_event(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, unsigned int spec_index,
	enum iio_event_type type, enum iio_event_direction dir,
	enum iio_shared_by shared_by, const unsigned long *mask)
{
	ssize_t (*show)(struct device *, struct device_attribute *, char *);
	ssize_t (*store)(struct device *, struct device_attribute *,
		const char *, size_t);
	unsigned int attrcount = 0;
	unsigned int i;
	char *postfix;
	int ret;

	for_each_set_bit(i, mask, sizeof(*mask)*8) {
		if (i >= ARRAY_SIZE(iio_ev_info_text))
			return -EINVAL;
		if (dir != IIO_EV_DIR_NONE)
			postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
					iio_ev_type_text[type],
					iio_ev_dir_text[dir],
					iio_ev_info_text[i]);
		else
			postfix = kasprintf(GFP_KERNEL, "%s_%s",
					iio_ev_type_text[type],
					iio_ev_info_text[i]);
		if (postfix == NULL)
			return -ENOMEM;

		if (i == IIO_EV_INFO_ENABLE) {
			show = iio_ev_state_show;
			store = iio_ev_state_store;
		} else {
			show = iio_ev_value_show;
			store = iio_ev_value_store;
		}

		ret = __iio_add_chan_devattr(postfix, chan, show, store,
			 (i << 16) | spec_index, shared_by, &indio_dev->dev,
			&indio_dev->event_interface->dev_attr_list);
		kfree(postfix);

		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
			continue;

		if (ret)
			return ret;

		attrcount++;
	}

	return attrcount;
}

static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan)
{
	int ret = 0, i, attrcount = 0;
	enum iio_event_direction dir;
	enum iio_event_type type;

	for (i = 0; i < chan->num_event_specs; i++) {
		type = chan->event_spec[i].type;
		dir = chan->event_spec[i].dir;

		ret = iio_device_add_event(indio_dev, chan, i, type, dir,
			IIO_SEPARATE, &chan->event_spec[i].mask_separate);
		if (ret < 0)
			return ret;
		attrcount += ret;

		ret = iio_device_add_event(indio_dev, chan, i, type, dir,
			IIO_SHARED_BY_TYPE,
			&chan->event_spec[i].mask_shared_by_type);
		if (ret < 0)
			return ret;
		attrcount += ret;

		ret = iio_device_add_event(indio_dev, chan, i, type, dir,
			IIO_SHARED_BY_DIR,
			&chan->event_spec[i].mask_shared_by_dir);
		if (ret < 0)
			return ret;
		attrcount += ret;

		ret = iio_device_add_event(indio_dev, chan, i, type, dir,
			IIO_SHARED_BY_ALL,
			&chan->event_spec[i].mask_shared_by_all);
		if (ret < 0)
			return ret;
		attrcount += ret;
	}
	ret = attrcount;
	return ret;
}

static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
{
	int j, ret, attrcount = 0;

	/* Dynically created from the channels array */
	for (j = 0; j < indio_dev->num_channels; j++) {
		ret = iio_device_add_event_sysfs(indio_dev,
						 &indio_dev->channels[j]);
		if (ret < 0)
			return ret;
		attrcount += ret;
	}
	return attrcount;
}

static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
{
	int j;

	for (j = 0; j < indio_dev->num_channels; j++) {
		if (indio_dev->channels[j].num_event_specs != 0)
			return true;
	}
	return false;
}

static void iio_setup_ev_int(struct iio_event_interface *ev_int)
{
	INIT_KFIFO(ev_int->det_events);
	init_waitqueue_head(&ev_int->wait);
	mutex_init(&ev_int->read_lock);
}

static const char *iio_event_group_name = "events";
int iio_device_register_eventset(struct iio_dev *indio_dev)
{
	struct iio_dev_attr *p;
	int ret = 0, attrcount_orig = 0, attrcount, attrn;
	struct attribute **attr;

	if (!(indio_dev->info->event_attrs ||
	      iio_check_for_dynamic_events(indio_dev)))
		return 0;

	indio_dev->event_interface =
		kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
	if (indio_dev->event_interface == NULL)
		return -ENOMEM;

	INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);

	iio_setup_ev_int(indio_dev->event_interface);
	if (indio_dev->info->event_attrs != NULL) {
		attr = indio_dev->info->event_attrs->attrs;
		while (*attr++ != NULL)
			attrcount_orig++;
	}
	attrcount = attrcount_orig;
	if (indio_dev->channels) {
		ret = __iio_add_event_config_attrs(indio_dev);
		if (ret < 0)
			goto error_free_setup_event_lines;
		attrcount += ret;
	}

	indio_dev->event_interface->group.name = iio_event_group_name;
	indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
							  sizeof(indio_dev->event_interface->group.attrs[0]),
							  GFP_KERNEL);
	if (indio_dev->event_interface->group.attrs == NULL) {
		ret = -ENOMEM;
		goto error_free_setup_event_lines;
	}
	if (indio_dev->info->event_attrs)
		memcpy(indio_dev->event_interface->group.attrs,
		       indio_dev->info->event_attrs->attrs,
		       sizeof(indio_dev->event_interface->group.attrs[0])
		       *attrcount_orig);
	attrn = attrcount_orig;
	/* Add all elements from the list. */
	list_for_each_entry(p,
			    &indio_dev->event_interface->dev_attr_list,
			    l)
		indio_dev->event_interface->group.attrs[attrn++] =
			&p->dev_attr.attr;
	indio_dev->groups[indio_dev->groupcounter++] =
		&indio_dev->event_interface->group;

	return 0;

error_free_setup_event_lines:
	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
	kfree(indio_dev->event_interface);
	return ret;
}

/**
 * iio_device_wakeup_eventset - Wakes up the event waitqueue
 * @indio_dev: The IIO device
 *
 * Wakes up the event waitqueue used for poll() and blocking read().
 * Should usually be called when the device is unregistered.
 */
void iio_device_wakeup_eventset(struct iio_dev *indio_dev)
{
	if (indio_dev->event_interface == NULL)
		return;
	wake_up(&indio_dev->event_interface->wait);
}

void iio_device_unregister_eventset(struct iio_dev *indio_dev)
{
	if (indio_dev->event_interface == NULL)
		return;
	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
	kfree(indio_dev->event_interface->group.attrs);
	kfree(indio_dev->event_interface);
}
Commit	Line	Data
0a769a95 LPC	1	/* Industrial I/O event handling
	2	*
	3	* Copyright (c) 2008 Jonathan Cameron
	4	*
	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	*
	9	* Based on elements of hwmon and input subsystems.
	10	*/
	11
	12	#include <linux/anon_inodes.h>
	13	#include <linux/device.h>
	14	#include <linux/fs.h>
	15	#include <linux/kernel.h>
2c00193f	16	#include <linux/kfifo.h>
0a769a95	17	#include <linux/module.h>
e18045ed	18	#include <linux/poll.h>
0a769a95 LPC	19	#include <linux/sched.h>
	20	#include <linux/slab.h>
	21	#include <linux/uaccess.h>
	22	#include <linux/wait.h>
06458e27	23	#include <linux/iio/iio.h>
0a769a95	24	#include "iio_core.h"
06458e27 JC	25	#include <linux/iio/sysfs.h>
06458e27 JC	26	#include <linux/iio/events.h>
0a769a95	27
0a769a95 LPC	28	/**
	29	* struct iio_event_interface - chrdev interface for an event line
	30	* @wait: wait queue to allow blocking reads of events
0a769a95	31	* @det_events: list of detected events
0a769a95 LPC	32	* @dev_attr_list: list of event interface sysfs attribute
	33	* @flags: file operations related flags including busy flag.
	34	* @group: event interface sysfs attribute group
	35	*/
	36	struct iio_event_interface {
	37	wait_queue_head_t wait;
2c00193f LPC	38	DECLARE_KFIFO(det_events, struct iio_event_data, 16);
2c00193f LPC	39
0a769a95 LPC	40	struct list_head dev_attr_list;
	41	unsigned long flags;
	42	struct attribute_group group;
b91accaf	43	struct mutex read_lock;
0a769a95 LPC	44	};
0a769a95 LPC	45
a7e57dce SK	46	/**
	47	* iio_push_event() - try to add event to the list for userspace reading
	48	* @indio_dev: IIO device structure
	49	* @ev_code: What event
	50	* @timestamp: When the event occurred
b91accaf LPC	51	*
	52	* Note: The caller must make sure that this function is not running
	53	* concurrently for the same indio_dev more than once.
a7e57dce	54	**/
0a769a95 LPC	55	int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
	56	{
	57	struct iio_event_interface *ev_int = indio_dev->event_interface;
2c00193f LPC	58	struct iio_event_data ev;
2c00193f LPC	59	int copied;
0a769a95 LPC	60
0a769a95 LPC	61	/* Does anyone care? */
0a769a95	62	if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
0a769a95	63
2c00193f LPC	64	ev.id = ev_code;
	65	ev.timestamp = timestamp;
	66
498d319b	67	copied = kfifo_put(&ev_int->det_events, ev);
2c00193f	68	if (copied != 0)
b91accaf	69	wake_up_poll(&ev_int->wait, POLLIN);
43ba1100	70	}
0a769a95	71
2c00193f	72	return 0;
0a769a95 LPC	73	}
	74	EXPORT_SYMBOL(iio_push_event);
	75
e18045ed LPC	76	/**
	77	* iio_event_poll() - poll the event queue to find out if it has data
	78	*/
	79	static unsigned int iio_event_poll(struct file *filep,
	80	struct poll_table_struct *wait)
	81	{
cadc2125 LPC	82	struct iio_dev *indio_dev = filep->private_data;
cadc2125 LPC	83	struct iio_event_interface *ev_int = indio_dev->event_interface;
e18045ed LPC	84	unsigned int events = 0;
e18045ed LPC	85
f18e7a06 LPC	86	if (!indio_dev->info)
	87	return -ENODEV;
	88
e18045ed LPC	89	poll_wait(filep, &ev_int->wait, wait);
e18045ed LPC	90
e18045ed LPC	91	if (!kfifo_is_empty(&ev_int->det_events))
e18045ed LPC	92	events = POLLIN \| POLLRDNORM;
e18045ed LPC	93
	94	return events;
	95	}
	96
0a769a95 LPC	97	static ssize_t iio_event_chrdev_read(struct file *filep,
	98	char __user *buf,
	99	size_t count,
	100	loff_t *f_ps)
	101	{
cadc2125 LPC	102	struct iio_dev *indio_dev = filep->private_data;
cadc2125 LPC	103	struct iio_event_interface *ev_int = indio_dev->event_interface;
2c00193f	104	unsigned int copied;
0a769a95 LPC	105	int ret;
0a769a95 LPC	106
f18e7a06 LPC	107	if (!indio_dev->info)
	108	return -ENODEV;
	109
2c00193f	110	if (count < sizeof(struct iio_event_data))
0a769a95 LPC	111	return -EINVAL;
0a769a95 LPC	112
b91accaf LPC	113	do {
	114	if (kfifo_is_empty(&ev_int->det_events)) {
	115	if (filep->f_flags & O_NONBLOCK)
	116	return -EAGAIN;
	117
	118	ret = wait_event_interruptible(ev_int->wait,
d2f0a48f LPC	119	!kfifo_is_empty(&ev_int->det_events) \|\|
d2f0a48f LPC	120	indio_dev->info == NULL);
b91accaf LPC	121	if (ret)
	122	return ret;
	123	if (indio_dev->info == NULL)
	124	return -ENODEV;
d2f0a48f	125	}
0a769a95	126
b91accaf LPC	127	if (mutex_lock_interruptible(&ev_int->read_lock))
	128	return -ERESTARTSYS;
	129	ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied);
	130	mutex_unlock(&ev_int->read_lock);
	131
	132	if (ret)
	133	return ret;
	134
	135	/*
	136	* If we couldn't read anything from the fifo (a different
	137	* thread might have been faster) we either return -EAGAIN if
	138	* the file descriptor is non-blocking, otherwise we go back to
	139	* sleep and wait for more data to arrive.
	140	*/
	141	if (copied == 0 && (filep->f_flags & O_NONBLOCK))
	142	return -EAGAIN;
0a769a95	143
b91accaf	144	} while (copied == 0);
43ba1100	145
b91accaf	146	return copied;
0a769a95 LPC	147	}
	148
	149	static int iio_event_chrdev_release(struct inode inode, struct file filep)
	150	{
cadc2125 LPC	151	struct iio_dev *indio_dev = filep->private_data;
cadc2125 LPC	152	struct iio_event_interface *ev_int = indio_dev->event_interface;
0a769a95	153
b91accaf	154	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
0a769a95	155
cadc2125 LPC	156	iio_device_put(indio_dev);
cadc2125 LPC	157
0a769a95 LPC	158	return 0;
	159	}
	160
	161	static const struct file_operations iio_event_chrdev_fileops = {
	162	.read = iio_event_chrdev_read,
e18045ed	163	.poll = iio_event_poll,
0a769a95 LPC	164	.release = iio_event_chrdev_release,
	165	.owner = THIS_MODULE,
	166	.llseek = noop_llseek,
	167	};
	168
	169	int iio_event_getfd(struct iio_dev *indio_dev)
	170	{
	171	struct iio_event_interface *ev_int = indio_dev->event_interface;
	172	int fd;
	173
	174	if (ev_int == NULL)
	175	return -ENODEV;
	176
b91accaf	177	if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags))
0a769a95	178	return -EBUSY;
b91accaf	179
cadc2125 LPC	180	iio_device_get(indio_dev);
	181
	182	fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops,
e2aad1d5	183	indio_dev, O_RDONLY \| O_CLOEXEC);
0a769a95	184	if (fd < 0) {
b91accaf	185	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
cadc2125	186	iio_device_put(indio_dev);
b91accaf LPC	187	} else {
b91accaf LPC	188	kfifo_reset_out(&ev_int->det_events);
0a769a95	189	}
b91accaf	190
0a769a95 LPC	191	return fd;
	192	}
	193
	194	static const char * const iio_ev_type_text[] = {
	195	[IIO_EV_TYPE_THRESH] = "thresh",
	196	[IIO_EV_TYPE_MAG] = "mag",
	197	[IIO_EV_TYPE_ROC] = "roc",
	198	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
	199	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
a88bfe78	200	[IIO_EV_TYPE_INSTANCE] = "instance",
0a769a95 LPC	201	};
	202
	203	static const char * const iio_ev_dir_text[] = {
	204	[IIO_EV_DIR_EITHER] = "either",
	205	[IIO_EV_DIR_RISING] = "rising",
	206	[IIO_EV_DIR_FALLING] = "falling"
	207	};
	208
b4e3ac0a LPC	209	static const char * const iio_ev_info_text[] = {
	210	[IIO_EV_INFO_ENABLE] = "en",
	211	[IIO_EV_INFO_VALUE] = "value",
ec6670ae	212	[IIO_EV_INFO_HYSTERESIS] = "hysteresis",
77a533c7	213	[IIO_EV_INFO_PERIOD] = "period",
b4e3ac0a LPC	214	};
	215
	216	static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr)
	217	{
	218	return attr->c->event_spec[attr->address & 0xffff].dir;
	219	}
	220
	221	static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr)
	222	{
	223	return attr->c->event_spec[attr->address & 0xffff].type;
	224	}
	225
	226	static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr)
	227	{
	228	return (attr->address >> 16) & 0xffff;
	229	}
	230
0a769a95 LPC	231	static ssize_t iio_ev_state_store(struct device *dev,
	232	struct device_attribute *attr,
	233	const char *buf,
	234	size_t len)
	235	{
e53f5ac5	236	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0a769a95 LPC	237	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	238	int ret;
	239	bool val;
	240
	241	ret = strtobool(buf, &val);
	242	if (ret < 0)
	243	return ret;
	244
cb955852 LPC	245	ret = indio_dev->info->write_event_config(indio_dev,
	246	this_attr->c, iio_ev_attr_type(this_attr),
	247	iio_ev_attr_dir(this_attr), val);
b4e3ac0a	248
0a769a95 LPC	249	return (ret < 0) ? ret : len;
	250	}
	251
	252	static ssize_t iio_ev_state_show(struct device *dev,
	253	struct device_attribute *attr,
	254	char *buf)
	255	{
e53f5ac5	256	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0a769a95	257	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
b4e3ac0a	258	int val;
0a769a95	259
cb955852 LPC	260	val = indio_dev->info->read_event_config(indio_dev,
	261	this_attr->c, iio_ev_attr_type(this_attr),
	262	iio_ev_attr_dir(this_attr));
0a769a95 LPC	263	if (val < 0)
	264	return val;
	265	else
	266	return sprintf(buf, "%d\n", val);
	267	}
	268
	269	static ssize_t iio_ev_value_show(struct device *dev,
	270	struct device_attribute *attr,
	271	char *buf)
	272	{
e53f5ac5	273	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0a769a95	274	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
9fbfb4b3	275	int val, val2, val_arr[2];
b4e3ac0a	276	int ret;
0a769a95	277
cb955852 LPC	278	ret = indio_dev->info->read_event_value(indio_dev,
	279	this_attr->c, iio_ev_attr_type(this_attr),
	280	iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr),
	281	&val, &val2);
	282	if (ret < 0)
	283	return ret;
9fbfb4b3 SP	284	val_arr[0] = val;
	285	val_arr[1] = val2;
	286	return iio_format_value(buf, ret, 2, val_arr);
0a769a95 LPC	287	}
	288
	289	static ssize_t iio_ev_value_store(struct device *dev,
	290	struct device_attribute *attr,
	291	const char *buf,
	292	size_t len)
	293	{
e53f5ac5	294	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
0a769a95	295	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
b4e3ac0a	296	int val, val2;
0a769a95 LPC	297	int ret;
0a769a95 LPC	298
cb955852	299	if (!indio_dev->info->write_event_value)
0a769a95 LPC	300	return -EINVAL;
0a769a95 LPC	301
cb955852 LPC	302	ret = iio_str_to_fixpoint(buf, 100000, &val, &val2);
	303	if (ret)
	304	return ret;
	305	ret = indio_dev->info->write_event_value(indio_dev,
	306	this_attr->c, iio_ev_attr_type(this_attr),
	307	iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr),
	308	val, val2);
0a769a95 LPC	309	if (ret < 0)
	310	return ret;
	311
	312	return len;
	313	}
	314
b4e3ac0a LPC	315	static int iio_device_add_event(struct iio_dev *indio_dev,
	316	const struct iio_chan_spec *chan, unsigned int spec_index,
	317	enum iio_event_type type, enum iio_event_direction dir,
	318	enum iio_shared_by shared_by, const unsigned long *mask)
	319	{
	320	ssize_t (show)(struct device , struct device_attribute , char );
	321	ssize_t (store)(struct device , struct device_attribute *,
	322	const char *, size_t);
	323	unsigned int attrcount = 0;
	324	unsigned int i;
	325	char *postfix;
	326	int ret;
	327
ef4b4856 JC	328	for_each_set_bit(i, mask, sizeof(mask)8) {
	329	if (i >= ARRAY_SIZE(iio_ev_info_text))
	330	return -EINVAL;
1843c2f3 IT	331	if (dir != IIO_EV_DIR_NONE)
	332	postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
	333	iio_ev_type_text[type],
	334	iio_ev_dir_text[dir],
	335	iio_ev_info_text[i]);
	336	else
	337	postfix = kasprintf(GFP_KERNEL, "%s_%s",
	338	iio_ev_type_text[type],
	339	iio_ev_info_text[i]);
b4e3ac0a LPC	340	if (postfix == NULL)
	341	return -ENOMEM;
	342
	343	if (i == IIO_EV_INFO_ENABLE) {
	344	show = iio_ev_state_show;
	345	store = iio_ev_state_store;
	346	} else {
	347	show = iio_ev_value_show;
	348	store = iio_ev_value_store;
	349	}
	350
	351	ret = __iio_add_chan_devattr(postfix, chan, show, store,
	352	(i << 16) \| spec_index, shared_by, &indio_dev->dev,
	353	&indio_dev->event_interface->dev_attr_list);
	354	kfree(postfix);
	355
78b33216 SP	356	if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
	357	continue;
	358
b4e3ac0a LPC	359	if (ret)
	360	return ret;
	361
	362	attrcount++;
	363	}
	364
	365	return attrcount;
	366	}
	367
cb955852	368	static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
b4e3ac0a LPC	369	struct iio_chan_spec const *chan)
	370	{
	371	int ret = 0, i, attrcount = 0;
	372	enum iio_event_direction dir;
	373	enum iio_event_type type;
	374
	375	for (i = 0; i < chan->num_event_specs; i++) {
	376	type = chan->event_spec[i].type;
	377	dir = chan->event_spec[i].dir;
	378
	379	ret = iio_device_add_event(indio_dev, chan, i, type, dir,
	380	IIO_SEPARATE, &chan->event_spec[i].mask_separate);
	381	if (ret < 0)
92825ff9	382	return ret;
b4e3ac0a LPC	383	attrcount += ret;
	384
	385	ret = iio_device_add_event(indio_dev, chan, i, type, dir,
	386	IIO_SHARED_BY_TYPE,
	387	&chan->event_spec[i].mask_shared_by_type);
	388	if (ret < 0)
92825ff9	389	return ret;
b4e3ac0a LPC	390	attrcount += ret;
	391
	392	ret = iio_device_add_event(indio_dev, chan, i, type, dir,
	393	IIO_SHARED_BY_DIR,
	394	&chan->event_spec[i].mask_shared_by_dir);
	395	if (ret < 0)
92825ff9	396	return ret;
b4e3ac0a LPC	397	attrcount += ret;
	398
	399	ret = iio_device_add_event(indio_dev, chan, i, type, dir,
	400	IIO_SHARED_BY_ALL,
	401	&chan->event_spec[i].mask_shared_by_all);
	402	if (ret < 0)
92825ff9	403	return ret;
b4e3ac0a LPC	404	attrcount += ret;
	405	}
	406	ret = attrcount;
b4e3ac0a LPC	407	return ret;
	408	}
	409
0a769a95 LPC	410	static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
	411	{
	412	int j, ret, attrcount = 0;
	413
0a769a95 LPC	414	/* Dynically created from the channels array */
	415	for (j = 0; j < indio_dev->num_channels; j++) {
	416	ret = iio_device_add_event_sysfs(indio_dev,
	417	&indio_dev->channels[j]);
	418	if (ret < 0)
e3db9ef6	419	return ret;
0a769a95 LPC	420	attrcount += ret;
	421	}
	422	return attrcount;
0a769a95 LPC	423	}
	424
	425	static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
	426	{
	427	int j;
	428
b4e3ac0a	429	for (j = 0; j < indio_dev->num_channels; j++) {
b4e3ac0a LPC	430	if (indio_dev->channels[j].num_event_specs != 0)
	431	return true;
	432	}
0a769a95 LPC	433	return false;
	434	}
	435
	436	static void iio_setup_ev_int(struct iio_event_interface *ev_int)
	437	{
2c00193f	438	INIT_KFIFO(ev_int->det_events);
0a769a95	439	init_waitqueue_head(&ev_int->wait);
b91accaf	440	mutex_init(&ev_int->read_lock);
0a769a95 LPC	441	}
	442
	443	static const char *iio_event_group_name = "events";
	444	int iio_device_register_eventset(struct iio_dev *indio_dev)
	445	{
	446	struct iio_dev_attr *p;
	447	int ret = 0, attrcount_orig = 0, attrcount, attrn;
	448	struct attribute **attr;
	449
	450	if (!(indio_dev->info->event_attrs \|\|
	451	iio_check_for_dynamic_events(indio_dev)))
	452	return 0;
	453
	454	indio_dev->event_interface =
	455	kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
92825ff9 HK	456	if (indio_dev->event_interface == NULL)
92825ff9 HK	457	return -ENOMEM;
0a769a95	458
46b24311 SH	459	INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
46b24311 SH	460
0a769a95 LPC	461	iio_setup_ev_int(indio_dev->event_interface);
	462	if (indio_dev->info->event_attrs != NULL) {
	463	attr = indio_dev->info->event_attrs->attrs;
	464	while (*attr++ != NULL)
	465	attrcount_orig++;
	466	}
	467	attrcount = attrcount_orig;
	468	if (indio_dev->channels) {
	469	ret = __iio_add_event_config_attrs(indio_dev);
	470	if (ret < 0)
	471	goto error_free_setup_event_lines;
	472	attrcount += ret;
	473	}
	474
	475	indio_dev->event_interface->group.name = iio_event_group_name;
	476	indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
	477	sizeof(indio_dev->event_interface->group.attrs[0]),
	478	GFP_KERNEL);
	479	if (indio_dev->event_interface->group.attrs == NULL) {
	480	ret = -ENOMEM;
	481	goto error_free_setup_event_lines;
	482	}
	483	if (indio_dev->info->event_attrs)
	484	memcpy(indio_dev->event_interface->group.attrs,
	485	indio_dev->info->event_attrs->attrs,
	486	sizeof(indio_dev->event_interface->group.attrs[0])
	487	*attrcount_orig);
	488	attrn = attrcount_orig;
	489	/* Add all elements from the list. */
	490	list_for_each_entry(p,
	491	&indio_dev->event_interface->dev_attr_list,
	492	l)
	493	indio_dev->event_interface->group.attrs[attrn++] =
	494	&p->dev_attr.attr;
	495	indio_dev->groups[indio_dev->groupcounter++] =
	496	&indio_dev->event_interface->group;
	497
	498	return 0;
	499
	500	error_free_setup_event_lines:
84088ebd	501	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
0a769a95	502	kfree(indio_dev->event_interface);
0a769a95 LPC	503	return ret;
	504	}
	505
d2f0a48f LPC	506	/**
	507	* iio_device_wakeup_eventset - Wakes up the event waitqueue
	508	* @indio_dev: The IIO device
	509	*
	510	* Wakes up the event waitqueue used for poll() and blocking read().
	511	* Should usually be called when the device is unregistered.
	512	*/
	513	void iio_device_wakeup_eventset(struct iio_dev *indio_dev)
	514	{
	515	if (indio_dev->event_interface == NULL)
	516	return;
	517	wake_up(&indio_dev->event_interface->wait);
	518	}
	519
0a769a95 LPC	520	void iio_device_unregister_eventset(struct iio_dev *indio_dev)
	521	{
	522	if (indio_dev->event_interface == NULL)
	523	return;
84088ebd	524	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
0a769a95 LPC	525	kfree(indio_dev->event_interface->group.attrs);
	526	kfree(indio_dev->event_interface);
	527	}