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 | |
a316c01d | 35 | * @read_lock: lock to protect kfifo read operations |
0a769a95 LPC |
36 | */ |
37 | struct iio_event_interface { | |
38 | wait_queue_head_t wait; | |
2c00193f LPC |
39 | DECLARE_KFIFO(det_events, struct iio_event_data, 16); |
40 | ||
0a769a95 LPC |
41 | struct list_head dev_attr_list; |
42 | unsigned long flags; | |
43 | struct attribute_group group; | |
b91accaf | 44 | struct mutex read_lock; |
0a769a95 LPC |
45 | }; |
46 | ||
a7e57dce SK |
47 | /** |
48 | * iio_push_event() - try to add event to the list for userspace reading | |
49 | * @indio_dev: IIO device structure | |
50 | * @ev_code: What event | |
51 | * @timestamp: When the event occurred | |
b91accaf LPC |
52 | * |
53 | * Note: The caller must make sure that this function is not running | |
54 | * concurrently for the same indio_dev more than once. | |
a7e57dce | 55 | **/ |
0a769a95 LPC |
56 | int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) |
57 | { | |
58 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
2c00193f LPC |
59 | struct iio_event_data ev; |
60 | int copied; | |
0a769a95 LPC |
61 | |
62 | /* Does anyone care? */ | |
0a769a95 | 63 | if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { |
0a769a95 | 64 | |
2c00193f LPC |
65 | ev.id = ev_code; |
66 | ev.timestamp = timestamp; | |
67 | ||
498d319b | 68 | copied = kfifo_put(&ev_int->det_events, ev); |
2c00193f | 69 | if (copied != 0) |
b91accaf | 70 | wake_up_poll(&ev_int->wait, POLLIN); |
43ba1100 | 71 | } |
0a769a95 | 72 | |
2c00193f | 73 | return 0; |
0a769a95 LPC |
74 | } |
75 | EXPORT_SYMBOL(iio_push_event); | |
76 | ||
e18045ed LPC |
77 | /** |
78 | * iio_event_poll() - poll the event queue to find out if it has data | |
a316c01d CO |
79 | * @filep: File structure pointer to identify the device |
80 | * @wait: Poll table pointer to add the wait queue on | |
81 | * | |
82 | * Return: (POLLIN | POLLRDNORM) if data is available for reading | |
83 | * or a negative error code on failure | |
e18045ed LPC |
84 | */ |
85 | static unsigned int iio_event_poll(struct file *filep, | |
86 | struct poll_table_struct *wait) | |
87 | { | |
cadc2125 LPC |
88 | struct iio_dev *indio_dev = filep->private_data; |
89 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
e18045ed LPC |
90 | unsigned int events = 0; |
91 | ||
f18e7a06 | 92 | if (!indio_dev->info) |
41d903c0 | 93 | return events; |
f18e7a06 | 94 | |
e18045ed LPC |
95 | poll_wait(filep, &ev_int->wait, wait); |
96 | ||
e18045ed LPC |
97 | if (!kfifo_is_empty(&ev_int->det_events)) |
98 | events = POLLIN | POLLRDNORM; | |
e18045ed LPC |
99 | |
100 | return events; | |
101 | } | |
102 | ||
0a769a95 LPC |
103 | static ssize_t iio_event_chrdev_read(struct file *filep, |
104 | char __user *buf, | |
105 | size_t count, | |
106 | loff_t *f_ps) | |
107 | { | |
cadc2125 LPC |
108 | struct iio_dev *indio_dev = filep->private_data; |
109 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
2c00193f | 110 | unsigned int copied; |
0a769a95 LPC |
111 | int ret; |
112 | ||
f18e7a06 LPC |
113 | if (!indio_dev->info) |
114 | return -ENODEV; | |
115 | ||
2c00193f | 116 | if (count < sizeof(struct iio_event_data)) |
0a769a95 LPC |
117 | return -EINVAL; |
118 | ||
b91accaf LPC |
119 | do { |
120 | if (kfifo_is_empty(&ev_int->det_events)) { | |
121 | if (filep->f_flags & O_NONBLOCK) | |
122 | return -EAGAIN; | |
123 | ||
124 | ret = wait_event_interruptible(ev_int->wait, | |
d2f0a48f LPC |
125 | !kfifo_is_empty(&ev_int->det_events) || |
126 | indio_dev->info == NULL); | |
b91accaf LPC |
127 | if (ret) |
128 | return ret; | |
129 | if (indio_dev->info == NULL) | |
130 | return -ENODEV; | |
d2f0a48f | 131 | } |
0a769a95 | 132 | |
b91accaf LPC |
133 | if (mutex_lock_interruptible(&ev_int->read_lock)) |
134 | return -ERESTARTSYS; | |
135 | ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied); | |
136 | mutex_unlock(&ev_int->read_lock); | |
137 | ||
138 | if (ret) | |
139 | return ret; | |
140 | ||
141 | /* | |
142 | * If we couldn't read anything from the fifo (a different | |
143 | * thread might have been faster) we either return -EAGAIN if | |
144 | * the file descriptor is non-blocking, otherwise we go back to | |
145 | * sleep and wait for more data to arrive. | |
146 | */ | |
147 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
148 | return -EAGAIN; | |
0a769a95 | 149 | |
b91accaf | 150 | } while (copied == 0); |
43ba1100 | 151 | |
b91accaf | 152 | return copied; |
0a769a95 LPC |
153 | } |
154 | ||
155 | static int iio_event_chrdev_release(struct inode *inode, struct file *filep) | |
156 | { | |
cadc2125 LPC |
157 | struct iio_dev *indio_dev = filep->private_data; |
158 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
0a769a95 | 159 | |
b91accaf | 160 | clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
0a769a95 | 161 | |
cadc2125 LPC |
162 | iio_device_put(indio_dev); |
163 | ||
0a769a95 LPC |
164 | return 0; |
165 | } | |
166 | ||
167 | static const struct file_operations iio_event_chrdev_fileops = { | |
168 | .read = iio_event_chrdev_read, | |
e18045ed | 169 | .poll = iio_event_poll, |
0a769a95 LPC |
170 | .release = iio_event_chrdev_release, |
171 | .owner = THIS_MODULE, | |
172 | .llseek = noop_llseek, | |
173 | }; | |
174 | ||
175 | int iio_event_getfd(struct iio_dev *indio_dev) | |
176 | { | |
177 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
178 | int fd; | |
179 | ||
180 | if (ev_int == NULL) | |
181 | return -ENODEV; | |
182 | ||
b91accaf | 183 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) |
0a769a95 | 184 | return -EBUSY; |
b91accaf | 185 | |
cadc2125 LPC |
186 | iio_device_get(indio_dev); |
187 | ||
188 | fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, | |
e2aad1d5 | 189 | indio_dev, O_RDONLY | O_CLOEXEC); |
0a769a95 | 190 | if (fd < 0) { |
b91accaf | 191 | clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
cadc2125 | 192 | iio_device_put(indio_dev); |
b91accaf LPC |
193 | } else { |
194 | kfifo_reset_out(&ev_int->det_events); | |
0a769a95 | 195 | } |
b91accaf | 196 | |
0a769a95 LPC |
197 | return fd; |
198 | } | |
199 | ||
200 | static const char * const iio_ev_type_text[] = { | |
201 | [IIO_EV_TYPE_THRESH] = "thresh", | |
202 | [IIO_EV_TYPE_MAG] = "mag", | |
203 | [IIO_EV_TYPE_ROC] = "roc", | |
204 | [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", | |
205 | [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", | |
27be8423 | 206 | [IIO_EV_TYPE_CHANGE] = "change", |
0a769a95 LPC |
207 | }; |
208 | ||
209 | static const char * const iio_ev_dir_text[] = { | |
210 | [IIO_EV_DIR_EITHER] = "either", | |
211 | [IIO_EV_DIR_RISING] = "rising", | |
212 | [IIO_EV_DIR_FALLING] = "falling" | |
213 | }; | |
214 | ||
b4e3ac0a LPC |
215 | static const char * const iio_ev_info_text[] = { |
216 | [IIO_EV_INFO_ENABLE] = "en", | |
217 | [IIO_EV_INFO_VALUE] = "value", | |
ec6670ae | 218 | [IIO_EV_INFO_HYSTERESIS] = "hysteresis", |
77a533c7 | 219 | [IIO_EV_INFO_PERIOD] = "period", |
3f7f642b MF |
220 | [IIO_EV_INFO_HIGH_PASS_FILTER_3DB] = "high_pass_filter_3db", |
221 | [IIO_EV_INFO_LOW_PASS_FILTER_3DB] = "low_pass_filter_3db", | |
b4e3ac0a LPC |
222 | }; |
223 | ||
224 | static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr) | |
225 | { | |
226 | return attr->c->event_spec[attr->address & 0xffff].dir; | |
227 | } | |
228 | ||
229 | static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr) | |
230 | { | |
231 | return attr->c->event_spec[attr->address & 0xffff].type; | |
232 | } | |
233 | ||
234 | static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr) | |
235 | { | |
236 | return (attr->address >> 16) & 0xffff; | |
237 | } | |
238 | ||
0a769a95 LPC |
239 | static ssize_t iio_ev_state_store(struct device *dev, |
240 | struct device_attribute *attr, | |
241 | const char *buf, | |
242 | size_t len) | |
243 | { | |
e53f5ac5 | 244 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 LPC |
245 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
246 | int ret; | |
247 | bool val; | |
248 | ||
249 | ret = strtobool(buf, &val); | |
250 | if (ret < 0) | |
251 | return ret; | |
252 | ||
cb955852 LPC |
253 | ret = indio_dev->info->write_event_config(indio_dev, |
254 | this_attr->c, iio_ev_attr_type(this_attr), | |
255 | iio_ev_attr_dir(this_attr), val); | |
b4e3ac0a | 256 | |
0a769a95 LPC |
257 | return (ret < 0) ? ret : len; |
258 | } | |
259 | ||
260 | static ssize_t iio_ev_state_show(struct device *dev, | |
261 | struct device_attribute *attr, | |
262 | char *buf) | |
263 | { | |
e53f5ac5 | 264 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 265 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
b4e3ac0a | 266 | int val; |
0a769a95 | 267 | |
cb955852 LPC |
268 | val = indio_dev->info->read_event_config(indio_dev, |
269 | this_attr->c, iio_ev_attr_type(this_attr), | |
270 | iio_ev_attr_dir(this_attr)); | |
0a769a95 LPC |
271 | if (val < 0) |
272 | return val; | |
273 | else | |
274 | return sprintf(buf, "%d\n", val); | |
275 | } | |
276 | ||
277 | static ssize_t iio_ev_value_show(struct device *dev, | |
278 | struct device_attribute *attr, | |
279 | char *buf) | |
280 | { | |
e53f5ac5 | 281 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 282 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
9fbfb4b3 | 283 | int val, val2, val_arr[2]; |
b4e3ac0a | 284 | int ret; |
0a769a95 | 285 | |
cb955852 LPC |
286 | ret = indio_dev->info->read_event_value(indio_dev, |
287 | this_attr->c, iio_ev_attr_type(this_attr), | |
288 | iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), | |
289 | &val, &val2); | |
290 | if (ret < 0) | |
291 | return ret; | |
9fbfb4b3 SP |
292 | val_arr[0] = val; |
293 | val_arr[1] = val2; | |
294 | return iio_format_value(buf, ret, 2, val_arr); | |
0a769a95 LPC |
295 | } |
296 | ||
297 | static ssize_t iio_ev_value_store(struct device *dev, | |
298 | struct device_attribute *attr, | |
299 | const char *buf, | |
300 | size_t len) | |
301 | { | |
e53f5ac5 | 302 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 303 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
b4e3ac0a | 304 | int val, val2; |
0a769a95 LPC |
305 | int ret; |
306 | ||
cb955852 | 307 | if (!indio_dev->info->write_event_value) |
0a769a95 LPC |
308 | return -EINVAL; |
309 | ||
cb955852 LPC |
310 | ret = iio_str_to_fixpoint(buf, 100000, &val, &val2); |
311 | if (ret) | |
312 | return ret; | |
313 | ret = indio_dev->info->write_event_value(indio_dev, | |
314 | this_attr->c, iio_ev_attr_type(this_attr), | |
315 | iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), | |
316 | val, val2); | |
0a769a95 LPC |
317 | if (ret < 0) |
318 | return ret; | |
319 | ||
320 | return len; | |
321 | } | |
322 | ||
b4e3ac0a LPC |
323 | static int iio_device_add_event(struct iio_dev *indio_dev, |
324 | const struct iio_chan_spec *chan, unsigned int spec_index, | |
325 | enum iio_event_type type, enum iio_event_direction dir, | |
326 | enum iio_shared_by shared_by, const unsigned long *mask) | |
327 | { | |
328 | ssize_t (*show)(struct device *, struct device_attribute *, char *); | |
329 | ssize_t (*store)(struct device *, struct device_attribute *, | |
330 | const char *, size_t); | |
331 | unsigned int attrcount = 0; | |
332 | unsigned int i; | |
333 | char *postfix; | |
334 | int ret; | |
335 | ||
ef4b4856 JC |
336 | for_each_set_bit(i, mask, sizeof(*mask)*8) { |
337 | if (i >= ARRAY_SIZE(iio_ev_info_text)) | |
338 | return -EINVAL; | |
1843c2f3 IT |
339 | if (dir != IIO_EV_DIR_NONE) |
340 | postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
341 | iio_ev_type_text[type], | |
342 | iio_ev_dir_text[dir], | |
343 | iio_ev_info_text[i]); | |
344 | else | |
345 | postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
346 | iio_ev_type_text[type], | |
347 | iio_ev_info_text[i]); | |
b4e3ac0a LPC |
348 | if (postfix == NULL) |
349 | return -ENOMEM; | |
350 | ||
351 | if (i == IIO_EV_INFO_ENABLE) { | |
352 | show = iio_ev_state_show; | |
353 | store = iio_ev_state_store; | |
354 | } else { | |
355 | show = iio_ev_value_show; | |
356 | store = iio_ev_value_store; | |
357 | } | |
358 | ||
359 | ret = __iio_add_chan_devattr(postfix, chan, show, store, | |
360 | (i << 16) | spec_index, shared_by, &indio_dev->dev, | |
361 | &indio_dev->event_interface->dev_attr_list); | |
362 | kfree(postfix); | |
363 | ||
78b33216 SP |
364 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
365 | continue; | |
366 | ||
b4e3ac0a LPC |
367 | if (ret) |
368 | return ret; | |
369 | ||
370 | attrcount++; | |
371 | } | |
372 | ||
373 | return attrcount; | |
374 | } | |
375 | ||
cb955852 | 376 | static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, |
b4e3ac0a LPC |
377 | struct iio_chan_spec const *chan) |
378 | { | |
379 | int ret = 0, i, attrcount = 0; | |
380 | enum iio_event_direction dir; | |
381 | enum iio_event_type type; | |
382 | ||
383 | for (i = 0; i < chan->num_event_specs; i++) { | |
384 | type = chan->event_spec[i].type; | |
385 | dir = chan->event_spec[i].dir; | |
386 | ||
387 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
388 | IIO_SEPARATE, &chan->event_spec[i].mask_separate); | |
389 | if (ret < 0) | |
92825ff9 | 390 | return ret; |
b4e3ac0a LPC |
391 | attrcount += ret; |
392 | ||
393 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
394 | IIO_SHARED_BY_TYPE, | |
395 | &chan->event_spec[i].mask_shared_by_type); | |
396 | if (ret < 0) | |
92825ff9 | 397 | return ret; |
b4e3ac0a LPC |
398 | attrcount += ret; |
399 | ||
400 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
401 | IIO_SHARED_BY_DIR, | |
402 | &chan->event_spec[i].mask_shared_by_dir); | |
403 | if (ret < 0) | |
92825ff9 | 404 | return ret; |
b4e3ac0a LPC |
405 | attrcount += ret; |
406 | ||
407 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
408 | IIO_SHARED_BY_ALL, | |
409 | &chan->event_spec[i].mask_shared_by_all); | |
410 | if (ret < 0) | |
92825ff9 | 411 | return ret; |
b4e3ac0a LPC |
412 | attrcount += ret; |
413 | } | |
414 | ret = attrcount; | |
b4e3ac0a LPC |
415 | return ret; |
416 | } | |
417 | ||
0a769a95 LPC |
418 | static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) |
419 | { | |
420 | int j, ret, attrcount = 0; | |
421 | ||
2179aabe | 422 | /* Dynamically created from the channels array */ |
0a769a95 LPC |
423 | for (j = 0; j < indio_dev->num_channels; j++) { |
424 | ret = iio_device_add_event_sysfs(indio_dev, | |
425 | &indio_dev->channels[j]); | |
426 | if (ret < 0) | |
e3db9ef6 | 427 | return ret; |
0a769a95 LPC |
428 | attrcount += ret; |
429 | } | |
430 | return attrcount; | |
0a769a95 LPC |
431 | } |
432 | ||
433 | static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) | |
434 | { | |
435 | int j; | |
436 | ||
b4e3ac0a | 437 | for (j = 0; j < indio_dev->num_channels; j++) { |
b4e3ac0a LPC |
438 | if (indio_dev->channels[j].num_event_specs != 0) |
439 | return true; | |
440 | } | |
0a769a95 LPC |
441 | return false; |
442 | } | |
443 | ||
444 | static void iio_setup_ev_int(struct iio_event_interface *ev_int) | |
445 | { | |
2c00193f | 446 | INIT_KFIFO(ev_int->det_events); |
0a769a95 | 447 | init_waitqueue_head(&ev_int->wait); |
b91accaf | 448 | mutex_init(&ev_int->read_lock); |
0a769a95 LPC |
449 | } |
450 | ||
451 | static const char *iio_event_group_name = "events"; | |
452 | int iio_device_register_eventset(struct iio_dev *indio_dev) | |
453 | { | |
454 | struct iio_dev_attr *p; | |
455 | int ret = 0, attrcount_orig = 0, attrcount, attrn; | |
456 | struct attribute **attr; | |
457 | ||
458 | if (!(indio_dev->info->event_attrs || | |
459 | iio_check_for_dynamic_events(indio_dev))) | |
460 | return 0; | |
461 | ||
462 | indio_dev->event_interface = | |
463 | kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); | |
92825ff9 HK |
464 | if (indio_dev->event_interface == NULL) |
465 | return -ENOMEM; | |
0a769a95 | 466 | |
46b24311 SH |
467 | INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); |
468 | ||
0a769a95 LPC |
469 | iio_setup_ev_int(indio_dev->event_interface); |
470 | if (indio_dev->info->event_attrs != NULL) { | |
471 | attr = indio_dev->info->event_attrs->attrs; | |
472 | while (*attr++ != NULL) | |
473 | attrcount_orig++; | |
474 | } | |
475 | attrcount = attrcount_orig; | |
476 | if (indio_dev->channels) { | |
477 | ret = __iio_add_event_config_attrs(indio_dev); | |
478 | if (ret < 0) | |
479 | goto error_free_setup_event_lines; | |
480 | attrcount += ret; | |
481 | } | |
482 | ||
483 | indio_dev->event_interface->group.name = iio_event_group_name; | |
484 | indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1, | |
485 | sizeof(indio_dev->event_interface->group.attrs[0]), | |
486 | GFP_KERNEL); | |
487 | if (indio_dev->event_interface->group.attrs == NULL) { | |
488 | ret = -ENOMEM; | |
489 | goto error_free_setup_event_lines; | |
490 | } | |
491 | if (indio_dev->info->event_attrs) | |
492 | memcpy(indio_dev->event_interface->group.attrs, | |
493 | indio_dev->info->event_attrs->attrs, | |
494 | sizeof(indio_dev->event_interface->group.attrs[0]) | |
495 | *attrcount_orig); | |
496 | attrn = attrcount_orig; | |
497 | /* Add all elements from the list. */ | |
498 | list_for_each_entry(p, | |
499 | &indio_dev->event_interface->dev_attr_list, | |
500 | l) | |
501 | indio_dev->event_interface->group.attrs[attrn++] = | |
502 | &p->dev_attr.attr; | |
503 | indio_dev->groups[indio_dev->groupcounter++] = | |
504 | &indio_dev->event_interface->group; | |
505 | ||
506 | return 0; | |
507 | ||
508 | error_free_setup_event_lines: | |
84088ebd | 509 | iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); |
0a769a95 | 510 | kfree(indio_dev->event_interface); |
c1b03ab5 | 511 | indio_dev->event_interface = NULL; |
0a769a95 LPC |
512 | return ret; |
513 | } | |
514 | ||
d2f0a48f LPC |
515 | /** |
516 | * iio_device_wakeup_eventset - Wakes up the event waitqueue | |
517 | * @indio_dev: The IIO device | |
518 | * | |
519 | * Wakes up the event waitqueue used for poll() and blocking read(). | |
520 | * Should usually be called when the device is unregistered. | |
521 | */ | |
522 | void iio_device_wakeup_eventset(struct iio_dev *indio_dev) | |
523 | { | |
524 | if (indio_dev->event_interface == NULL) | |
525 | return; | |
526 | wake_up(&indio_dev->event_interface->wait); | |
527 | } | |
528 | ||
0a769a95 LPC |
529 | void iio_device_unregister_eventset(struct iio_dev *indio_dev) |
530 | { | |
531 | if (indio_dev->event_interface == NULL) | |
532 | return; | |
84088ebd | 533 | iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); |
0a769a95 LPC |
534 | kfree(indio_dev->event_interface->group.attrs); |
535 | kfree(indio_dev->event_interface); | |
536 | } |