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> |
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); |
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 | }; |
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; |
59 | int copied; | |
0a769a95 LPC |
60 | |
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; |
83 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
e18045ed LPC |
84 | unsigned int events = 0; |
85 | ||
f18e7a06 LPC |
86 | if (!indio_dev->info) |
87 | return -ENODEV; | |
88 | ||
e18045ed LPC |
89 | poll_wait(filep, &ev_int->wait, wait); |
90 | ||
e18045ed LPC |
91 | if (!kfifo_is_empty(&ev_int->det_events)) |
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; |
103 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
2c00193f | 104 | unsigned int copied; |
0a769a95 LPC |
105 | int ret; |
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; |
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) || |
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; |
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); |
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 { |
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", | |
27be8423 | 200 | [IIO_EV_TYPE_CHANGE] = "change", |
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; |
298 | ||
cb955852 | 299 | if (!indio_dev->info->write_event_value) |
0a769a95 LPC |
300 | return -EINVAL; |
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 | ||
2179aabe | 414 | /* Dynamically created from the channels array */ |
0a769a95 LPC |
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) |
457 | return -ENOMEM; | |
0a769a95 | 458 | |
46b24311 SH |
459 | INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); |
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); |
c1b03ab5 | 503 | indio_dev->event_interface = NULL; |
0a769a95 LPC |
504 | return ret; |
505 | } | |
506 | ||
d2f0a48f LPC |
507 | /** |
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 | */ | |
514 | void 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 | ||
0a769a95 LPC |
521 | void iio_device_unregister_eventset(struct iio_dev *indio_dev) |
522 | { | |
523 | if (indio_dev->event_interface == NULL) | |
524 | return; | |
84088ebd | 525 | iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); |
0a769a95 LPC |
526 | kfree(indio_dev->event_interface->group.attrs); |
527 | kfree(indio_dev->event_interface); | |
528 | } |