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Lars-Peter Clausen0a769a92012-01-03 14:59:38 +01001/* 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>
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010016#include <linux/kfifo.h>
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010017#include <linux/module.h>
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010018#include <linux/poll.h>
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010019#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/uaccess.h>
22#include <linux/wait.h>
Jonathan Cameron06458e22012-04-25 15:54:58 +010023#include <linux/iio/iio.h>
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010024#include "iio_core.h"
Jonathan Cameron06458e22012-04-25 15:54:58 +010025#include <linux/iio/sysfs.h>
26#include <linux/iio/events.h>
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010027
28/**
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010029 * struct iio_event_interface - chrdev interface for an event line
30 * @wait: wait queue to allow blocking reads of events
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010031 * @det_events: list of detected events
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010032 * @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 */
36struct iio_event_interface {
37 wait_queue_head_t wait;
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010038 DECLARE_KFIFO(det_events, struct iio_event_data, 16);
39
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010040 struct list_head dev_attr_list;
41 unsigned long flags;
42 struct attribute_group group;
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +000043 struct mutex read_lock;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010044};
45
Sachin Kamata7e57dc2013-10-29 11:39:00 +000046/**
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
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +000051 *
52 * Note: The caller must make sure that this function is not running
53 * concurrently for the same indio_dev more than once.
Sachin Kamata7e57dc2013-10-29 11:39:00 +000054 **/
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010055int 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;
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010058 struct iio_event_data ev;
59 int copied;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010060
61 /* Does anyone care? */
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010062 if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010063
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010064 ev.id = ev_code;
65 ev.timestamp = timestamp;
66
Stefani Seibold498d3192013-11-14 14:32:17 -080067 copied = kfifo_put(&ev_int->det_events, ev);
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010068 if (copied != 0)
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +000069 wake_up_poll(&ev_int->wait, POLLIN);
Lars-Peter Clausen43ba1102012-01-03 14:59:40 +010070 }
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010071
Lars-Peter Clausen2c001932012-01-03 14:59:39 +010072 return 0;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010073}
74EXPORT_SYMBOL(iio_push_event);
75
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010076/**
77 * iio_event_poll() - poll the event queue to find out if it has data
78 */
79static unsigned int iio_event_poll(struct file *filep,
80 struct poll_table_struct *wait)
81{
Lars-Peter Clausencadc2122013-09-18 21:02:00 +010082 struct iio_dev *indio_dev = filep->private_data;
83 struct iio_event_interface *ev_int = indio_dev->event_interface;
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010084 unsigned int events = 0;
85
Lars-Peter Clausenf18e7a02013-10-04 12:06:00 +010086 if (!indio_dev->info)
87 return -ENODEV;
88
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010089 poll_wait(filep, &ev_int->wait, wait);
90
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010091 if (!kfifo_is_empty(&ev_int->det_events))
92 events = POLLIN | POLLRDNORM;
Lars-Peter Clausene18045e2012-01-03 14:59:41 +010093
94 return events;
95}
96
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +010097static ssize_t iio_event_chrdev_read(struct file *filep,
98 char __user *buf,
99 size_t count,
100 loff_t *f_ps)
101{
Lars-Peter Clausencadc2122013-09-18 21:02:00 +0100102 struct iio_dev *indio_dev = filep->private_data;
103 struct iio_event_interface *ev_int = indio_dev->event_interface;
Lars-Peter Clausen2c001932012-01-03 14:59:39 +0100104 unsigned int copied;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100105 int ret;
106
Lars-Peter Clausenf18e7a02013-10-04 12:06:00 +0100107 if (!indio_dev->info)
108 return -ENODEV;
109
Lars-Peter Clausen2c001932012-01-03 14:59:39 +0100110 if (count < sizeof(struct iio_event_data))
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100111 return -EINVAL;
112
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000113 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,
Lars-Peter Clausend2f0a482013-10-04 12:07:00 +0100119 !kfifo_is_empty(&ev_int->det_events) ||
120 indio_dev->info == NULL);
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000121 if (ret)
122 return ret;
123 if (indio_dev->info == NULL)
124 return -ENODEV;
Lars-Peter Clausend2f0a482013-10-04 12:07:00 +0100125 }
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100126
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000127 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);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100131
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000132 if (ret)
133 return ret;
Lars-Peter Clausen43ba1102012-01-03 14:59:40 +0100134
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000135 /*
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;
143
144 } while (copied == 0);
145
146 return copied;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100147}
148
149static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
150{
Lars-Peter Clausencadc2122013-09-18 21:02:00 +0100151 struct iio_dev *indio_dev = filep->private_data;
152 struct iio_event_interface *ev_int = indio_dev->event_interface;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100153
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000154 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100155
Lars-Peter Clausencadc2122013-09-18 21:02:00 +0100156 iio_device_put(indio_dev);
157
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100158 return 0;
159}
160
161static const struct file_operations iio_event_chrdev_fileops = {
162 .read = iio_event_chrdev_read,
Lars-Peter Clausene18045e2012-01-03 14:59:41 +0100163 .poll = iio_event_poll,
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100164 .release = iio_event_chrdev_release,
165 .owner = THIS_MODULE,
166 .llseek = noop_llseek,
167};
168
169int 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
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000177 if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags))
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100178 return -EBUSY;
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000179
Lars-Peter Clausencadc2122013-09-18 21:02:00 +0100180 iio_device_get(indio_dev);
181
182 fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops,
Greg Kroah-Hartmane2aad1d2013-09-25 08:59:04 -0700183 indio_dev, O_RDONLY | O_CLOEXEC);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100184 if (fd < 0) {
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000185 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
Lars-Peter Clausencadc2122013-09-18 21:02:00 +0100186 iio_device_put(indio_dev);
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000187 } else {
188 kfifo_reset_out(&ev_int->det_events);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100189 }
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000190
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100191 return fd;
192}
193
194static 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",
Irina Tirdea27be8422015-01-11 21:10:11 +0200200 [IIO_EV_TYPE_CHANGE] = "change",
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100201};
202
203static 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
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100209static const char * const iio_ev_info_text[] = {
210 [IIO_EV_INFO_ENABLE] = "en",
211 [IIO_EV_INFO_VALUE] = "value",
Lars-Peter Clausenec6670a2013-10-07 15:11:00 +0100212 [IIO_EV_INFO_HYSTERESIS] = "hysteresis",
Srinivas Pandruvada77a533c2014-08-07 23:29:00 +0100213 [IIO_EV_INFO_PERIOD] = "period",
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100214};
215
216static 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
221static 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
226static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr)
227{
228 return (attr->address >> 16) & 0xffff;
229}
230
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100231static ssize_t iio_ev_state_store(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf,
234 size_t len)
235{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200236 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100237 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
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000245 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);
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100248
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100249 return (ret < 0) ? ret : len;
250}
251
252static ssize_t iio_ev_state_show(struct device *dev,
253 struct device_attribute *attr,
254 char *buf)
255{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200256 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100257 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100258 int val;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100259
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000260 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));
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100263 if (val < 0)
264 return val;
265 else
266 return sprintf(buf, "%d\n", val);
267}
268
269static ssize_t iio_ev_value_show(struct device *dev,
270 struct device_attribute *attr,
271 char *buf)
272{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200273 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100274 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100275 int val, val2, val_arr[2];
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100276 int ret;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100277
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000278 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;
Srinivas Pandruvada9fbfb4b2014-04-29 00:51:00 +0100284 val_arr[0] = val;
285 val_arr[1] = val2;
286 return iio_format_value(buf, ret, 2, val_arr);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100287}
288
289static ssize_t iio_ev_value_store(struct device *dev,
290 struct device_attribute *attr,
291 const char *buf,
292 size_t len)
293{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200294 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100295 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100296 int val, val2;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100297 int ret;
298
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000299 if (!indio_dev->info->write_event_value)
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100300 return -EINVAL;
301
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000302 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);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100309 if (ret < 0)
310 return ret;
311
312 return len;
313}
314
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100315static 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
Jonathan Cameronef4b4852014-01-03 22:24:00 +0000328 for_each_set_bit(i, mask, sizeof(*mask)*8) {
329 if (i >= ARRAY_SIZE(iio_ev_info_text))
330 return -EINVAL;
Irina Tirdea1843c2f2014-11-10 14:45:31 +0200331 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]);
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100340 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
Srinivas Pandruvada78b33212014-08-07 22:03:00 +0100356 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
357 continue;
358
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100359 if (ret)
360 return ret;
361
362 attrcount++;
363 }
364
365 return attrcount;
366}
367
Lars-Peter Clausencb955852013-12-07 10:45:00 +0000368static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100369 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)
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000382 return ret;
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100383 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)
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000389 return ret;
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100390 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)
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000396 return ret;
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100397 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)
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000403 return ret;
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100404 attrcount += ret;
405 }
406 ret = attrcount;
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100407 return ret;
408}
409
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100410static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
411{
412 int j, ret, attrcount = 0;
413
Roberta Dobrescu2179aab2015-01-16 00:24:14 +0200414 /* Dynamically created from the channels array */
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100415 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)
Julia Lawalle3db9ef2012-10-21 11:52:00 +0100419 return ret;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100420 attrcount += ret;
421 }
422 return attrcount;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100423}
424
425static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
426{
427 int j;
428
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100429 for (j = 0; j < indio_dev->num_channels; j++) {
Lars-Peter Clausenb4e3ac02013-10-07 15:11:00 +0100430 if (indio_dev->channels[j].num_event_specs != 0)
431 return true;
432 }
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100433 return false;
434}
435
436static void iio_setup_ev_int(struct iio_event_interface *ev_int)
437{
Lars-Peter Clausen2c001932012-01-03 14:59:39 +0100438 INIT_KFIFO(ev_int->det_events);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100439 init_waitqueue_head(&ev_int->wait);
Lars-Peter Clausenb91acca2014-02-14 18:49:00 +0000440 mutex_init(&ev_int->read_lock);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100441}
442
443static const char *iio_event_group_name = "events";
444int 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);
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000456 if (indio_dev->event_interface == NULL)
457 return -ENOMEM;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100458
Sascha Hauer46b24312012-07-03 10:55:40 +0200459 INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
460
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100461 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
500error_free_setup_event_lines:
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +0100501 iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100502 kfree(indio_dev->event_interface);
Martin Fuzzeyc1b03ab2015-02-19 15:17:44 +0100503 indio_dev->event_interface = NULL;
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100504 return ret;
505}
506
Lars-Peter Clausend2f0a482013-10-04 12:07:00 +0100507/**
508 * iio_device_wakeup_eventset - Wakes up the event waitqueue
509 * @indio_dev: The IIO device
510 *
511 * Wakes up the event waitqueue used for poll() and blocking read().
512 * Should usually be called when the device is unregistered.
513 */
514void iio_device_wakeup_eventset(struct iio_dev *indio_dev)
515{
516 if (indio_dev->event_interface == NULL)
517 return;
518 wake_up(&indio_dev->event_interface->wait);
519}
520
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100521void iio_device_unregister_eventset(struct iio_dev *indio_dev)
522{
523 if (indio_dev->event_interface == NULL)
524 return;
Lars-Peter Clausen84088eb2013-10-07 12:50:00 +0100525 iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
Lars-Peter Clausen0a769a92012-01-03 14:59:38 +0100526 kfree(indio_dev->event_interface->group.attrs);
527 kfree(indio_dev->event_interface);
528}