Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0a769a95 LPC |
2 | /* Industrial I/O event handling |
3 | * | |
4 | * Copyright (c) 2008 Jonathan Cameron | |
5 | * | |
0a769a95 LPC |
6 | * Based on elements of hwmon and input subsystems. |
7 | */ | |
8 | ||
9 | #include <linux/anon_inodes.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/kernel.h> | |
2c00193f | 13 | #include <linux/kfifo.h> |
0a769a95 | 14 | #include <linux/module.h> |
e18045ed | 15 | #include <linux/poll.h> |
0a769a95 LPC |
16 | #include <linux/sched.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/wait.h> | |
06458e27 | 20 | #include <linux/iio/iio.h> |
0a769a95 | 21 | #include "iio_core.h" |
06458e27 JC |
22 | #include <linux/iio/sysfs.h> |
23 | #include <linux/iio/events.h> | |
0a769a95 | 24 | |
0a769a95 LPC |
25 | /** |
26 | * struct iio_event_interface - chrdev interface for an event line | |
27 | * @wait: wait queue to allow blocking reads of events | |
0a769a95 | 28 | * @det_events: list of detected events |
0a769a95 LPC |
29 | * @dev_attr_list: list of event interface sysfs attribute |
30 | * @flags: file operations related flags including busy flag. | |
31 | * @group: event interface sysfs attribute group | |
a316c01d | 32 | * @read_lock: lock to protect kfifo read operations |
0a769a95 LPC |
33 | */ |
34 | struct iio_event_interface { | |
35 | wait_queue_head_t wait; | |
2c00193f LPC |
36 | DECLARE_KFIFO(det_events, struct iio_event_data, 16); |
37 | ||
0a769a95 LPC |
38 | struct list_head dev_attr_list; |
39 | unsigned long flags; | |
40 | struct attribute_group group; | |
b91accaf | 41 | struct mutex read_lock; |
0a769a95 LPC |
42 | }; |
43 | ||
bc2b7dab GB |
44 | bool iio_event_enabled(const struct iio_event_interface *ev_int) |
45 | { | |
46 | return !!test_bit(IIO_BUSY_BIT_POS, &ev_int->flags); | |
47 | } | |
48 | ||
a7e57dce SK |
49 | /** |
50 | * iio_push_event() - try to add event to the list for userspace reading | |
51 | * @indio_dev: IIO device structure | |
52 | * @ev_code: What event | |
53 | * @timestamp: When the event occurred | |
b91accaf LPC |
54 | * |
55 | * Note: The caller must make sure that this function is not running | |
56 | * concurrently for the same indio_dev more than once. | |
4b1a9380 LPC |
57 | * |
58 | * This function may be safely used as soon as a valid reference to iio_dev has | |
59 | * been obtained via iio_device_alloc(), but any events that are submitted | |
60 | * before iio_device_register() has successfully completed will be silently | |
61 | * discarded. | |
a7e57dce | 62 | **/ |
0a769a95 LPC |
63 | int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) |
64 | { | |
65 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
2c00193f LPC |
66 | struct iio_event_data ev; |
67 | int copied; | |
0a769a95 | 68 | |
4b1a9380 LPC |
69 | if (!ev_int) |
70 | return 0; | |
71 | ||
0a769a95 | 72 | /* Does anyone care? */ |
bc2b7dab | 73 | if (iio_event_enabled(ev_int)) { |
0a769a95 | 74 | |
2c00193f LPC |
75 | ev.id = ev_code; |
76 | ev.timestamp = timestamp; | |
77 | ||
498d319b | 78 | copied = kfifo_put(&ev_int->det_events, ev); |
2c00193f | 79 | if (copied != 0) |
a9a08845 | 80 | wake_up_poll(&ev_int->wait, EPOLLIN); |
43ba1100 | 81 | } |
0a769a95 | 82 | |
2c00193f | 83 | return 0; |
0a769a95 LPC |
84 | } |
85 | EXPORT_SYMBOL(iio_push_event); | |
86 | ||
e18045ed LPC |
87 | /** |
88 | * iio_event_poll() - poll the event queue to find out if it has data | |
a316c01d CO |
89 | * @filep: File structure pointer to identify the device |
90 | * @wait: Poll table pointer to add the wait queue on | |
91 | * | |
a9a08845 | 92 | * Return: (EPOLLIN | EPOLLRDNORM) if data is available for reading |
a316c01d | 93 | * or a negative error code on failure |
e18045ed | 94 | */ |
afc9a42b | 95 | static __poll_t iio_event_poll(struct file *filep, |
e18045ed LPC |
96 | struct poll_table_struct *wait) |
97 | { | |
cadc2125 LPC |
98 | struct iio_dev *indio_dev = filep->private_data; |
99 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
afc9a42b | 100 | __poll_t events = 0; |
e18045ed | 101 | |
f18e7a06 | 102 | if (!indio_dev->info) |
41d903c0 | 103 | return events; |
f18e7a06 | 104 | |
e18045ed LPC |
105 | poll_wait(filep, &ev_int->wait, wait); |
106 | ||
e18045ed | 107 | if (!kfifo_is_empty(&ev_int->det_events)) |
a9a08845 | 108 | events = EPOLLIN | EPOLLRDNORM; |
e18045ed LPC |
109 | |
110 | return events; | |
111 | } | |
112 | ||
0a769a95 LPC |
113 | static ssize_t iio_event_chrdev_read(struct file *filep, |
114 | char __user *buf, | |
115 | size_t count, | |
116 | loff_t *f_ps) | |
117 | { | |
cadc2125 LPC |
118 | struct iio_dev *indio_dev = filep->private_data; |
119 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
2c00193f | 120 | unsigned int copied; |
0a769a95 LPC |
121 | int ret; |
122 | ||
f18e7a06 LPC |
123 | if (!indio_dev->info) |
124 | return -ENODEV; | |
125 | ||
2c00193f | 126 | if (count < sizeof(struct iio_event_data)) |
0a769a95 LPC |
127 | return -EINVAL; |
128 | ||
b91accaf LPC |
129 | do { |
130 | if (kfifo_is_empty(&ev_int->det_events)) { | |
131 | if (filep->f_flags & O_NONBLOCK) | |
132 | return -EAGAIN; | |
133 | ||
134 | ret = wait_event_interruptible(ev_int->wait, | |
d2f0a48f LPC |
135 | !kfifo_is_empty(&ev_int->det_events) || |
136 | indio_dev->info == NULL); | |
b91accaf LPC |
137 | if (ret) |
138 | return ret; | |
139 | if (indio_dev->info == NULL) | |
140 | return -ENODEV; | |
d2f0a48f | 141 | } |
0a769a95 | 142 | |
b91accaf LPC |
143 | if (mutex_lock_interruptible(&ev_int->read_lock)) |
144 | return -ERESTARTSYS; | |
145 | ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied); | |
146 | mutex_unlock(&ev_int->read_lock); | |
147 | ||
148 | if (ret) | |
149 | return ret; | |
150 | ||
151 | /* | |
152 | * If we couldn't read anything from the fifo (a different | |
153 | * thread might have been faster) we either return -EAGAIN if | |
154 | * the file descriptor is non-blocking, otherwise we go back to | |
155 | * sleep and wait for more data to arrive. | |
156 | */ | |
157 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
158 | return -EAGAIN; | |
0a769a95 | 159 | |
b91accaf | 160 | } while (copied == 0); |
43ba1100 | 161 | |
b91accaf | 162 | return copied; |
0a769a95 LPC |
163 | } |
164 | ||
165 | static int iio_event_chrdev_release(struct inode *inode, struct file *filep) | |
166 | { | |
cadc2125 LPC |
167 | struct iio_dev *indio_dev = filep->private_data; |
168 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
0a769a95 | 169 | |
b91accaf | 170 | clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
0a769a95 | 171 | |
cadc2125 LPC |
172 | iio_device_put(indio_dev); |
173 | ||
0a769a95 LPC |
174 | return 0; |
175 | } | |
176 | ||
177 | static const struct file_operations iio_event_chrdev_fileops = { | |
178 | .read = iio_event_chrdev_read, | |
e18045ed | 179 | .poll = iio_event_poll, |
0a769a95 LPC |
180 | .release = iio_event_chrdev_release, |
181 | .owner = THIS_MODULE, | |
182 | .llseek = noop_llseek, | |
183 | }; | |
184 | ||
185 | int iio_event_getfd(struct iio_dev *indio_dev) | |
186 | { | |
187 | struct iio_event_interface *ev_int = indio_dev->event_interface; | |
188 | int fd; | |
189 | ||
190 | if (ev_int == NULL) | |
191 | return -ENODEV; | |
192 | ||
bc2b7dab GB |
193 | fd = mutex_lock_interruptible(&indio_dev->mlock); |
194 | if (fd) | |
195 | return fd; | |
196 | ||
197 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { | |
198 | fd = -EBUSY; | |
199 | goto unlock; | |
200 | } | |
b91accaf | 201 | |
cadc2125 LPC |
202 | iio_device_get(indio_dev); |
203 | ||
204 | fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, | |
e2aad1d5 | 205 | indio_dev, O_RDONLY | O_CLOEXEC); |
0a769a95 | 206 | if (fd < 0) { |
b91accaf | 207 | clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
cadc2125 | 208 | iio_device_put(indio_dev); |
b91accaf LPC |
209 | } else { |
210 | kfifo_reset_out(&ev_int->det_events); | |
0a769a95 | 211 | } |
b91accaf | 212 | |
bc2b7dab GB |
213 | unlock: |
214 | mutex_unlock(&indio_dev->mlock); | |
0a769a95 LPC |
215 | return fd; |
216 | } | |
217 | ||
218 | static const char * const iio_ev_type_text[] = { | |
219 | [IIO_EV_TYPE_THRESH] = "thresh", | |
220 | [IIO_EV_TYPE_MAG] = "mag", | |
221 | [IIO_EV_TYPE_ROC] = "roc", | |
222 | [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", | |
223 | [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", | |
27be8423 | 224 | [IIO_EV_TYPE_CHANGE] = "change", |
0a769a95 LPC |
225 | }; |
226 | ||
227 | static const char * const iio_ev_dir_text[] = { | |
228 | [IIO_EV_DIR_EITHER] = "either", | |
229 | [IIO_EV_DIR_RISING] = "rising", | |
230 | [IIO_EV_DIR_FALLING] = "falling" | |
231 | }; | |
232 | ||
b4e3ac0a LPC |
233 | static const char * const iio_ev_info_text[] = { |
234 | [IIO_EV_INFO_ENABLE] = "en", | |
235 | [IIO_EV_INFO_VALUE] = "value", | |
ec6670ae | 236 | [IIO_EV_INFO_HYSTERESIS] = "hysteresis", |
77a533c7 | 237 | [IIO_EV_INFO_PERIOD] = "period", |
3f7f642b MF |
238 | [IIO_EV_INFO_HIGH_PASS_FILTER_3DB] = "high_pass_filter_3db", |
239 | [IIO_EV_INFO_LOW_PASS_FILTER_3DB] = "low_pass_filter_3db", | |
b4e3ac0a LPC |
240 | }; |
241 | ||
242 | static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr) | |
243 | { | |
244 | return attr->c->event_spec[attr->address & 0xffff].dir; | |
245 | } | |
246 | ||
247 | static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr) | |
248 | { | |
249 | return attr->c->event_spec[attr->address & 0xffff].type; | |
250 | } | |
251 | ||
252 | static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr) | |
253 | { | |
254 | return (attr->address >> 16) & 0xffff; | |
255 | } | |
256 | ||
0a769a95 LPC |
257 | static ssize_t iio_ev_state_store(struct device *dev, |
258 | struct device_attribute *attr, | |
259 | const char *buf, | |
260 | size_t len) | |
261 | { | |
e53f5ac5 | 262 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 LPC |
263 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
264 | int ret; | |
265 | bool val; | |
266 | ||
267 | ret = strtobool(buf, &val); | |
268 | if (ret < 0) | |
269 | return ret; | |
270 | ||
cb955852 LPC |
271 | ret = indio_dev->info->write_event_config(indio_dev, |
272 | this_attr->c, iio_ev_attr_type(this_attr), | |
273 | iio_ev_attr_dir(this_attr), val); | |
b4e3ac0a | 274 | |
0a769a95 LPC |
275 | return (ret < 0) ? ret : len; |
276 | } | |
277 | ||
278 | static ssize_t iio_ev_state_show(struct device *dev, | |
279 | struct device_attribute *attr, | |
280 | char *buf) | |
281 | { | |
e53f5ac5 | 282 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 283 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
b4e3ac0a | 284 | int val; |
0a769a95 | 285 | |
cb955852 LPC |
286 | val = indio_dev->info->read_event_config(indio_dev, |
287 | this_attr->c, iio_ev_attr_type(this_attr), | |
288 | iio_ev_attr_dir(this_attr)); | |
0a769a95 LPC |
289 | if (val < 0) |
290 | return val; | |
291 | else | |
292 | return sprintf(buf, "%d\n", val); | |
293 | } | |
294 | ||
295 | static ssize_t iio_ev_value_show(struct device *dev, | |
296 | struct device_attribute *attr, | |
297 | char *buf) | |
298 | { | |
e53f5ac5 | 299 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 300 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
9fbfb4b3 | 301 | int val, val2, val_arr[2]; |
b4e3ac0a | 302 | int ret; |
0a769a95 | 303 | |
cb955852 LPC |
304 | ret = indio_dev->info->read_event_value(indio_dev, |
305 | this_attr->c, iio_ev_attr_type(this_attr), | |
306 | iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), | |
307 | &val, &val2); | |
308 | if (ret < 0) | |
309 | return ret; | |
9fbfb4b3 SP |
310 | val_arr[0] = val; |
311 | val_arr[1] = val2; | |
312 | return iio_format_value(buf, ret, 2, val_arr); | |
0a769a95 LPC |
313 | } |
314 | ||
315 | static ssize_t iio_ev_value_store(struct device *dev, | |
316 | struct device_attribute *attr, | |
317 | const char *buf, | |
318 | size_t len) | |
319 | { | |
e53f5ac5 | 320 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
0a769a95 | 321 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
b4e3ac0a | 322 | int val, val2; |
0a769a95 LPC |
323 | int ret; |
324 | ||
cb955852 | 325 | if (!indio_dev->info->write_event_value) |
0a769a95 LPC |
326 | return -EINVAL; |
327 | ||
cb955852 LPC |
328 | ret = iio_str_to_fixpoint(buf, 100000, &val, &val2); |
329 | if (ret) | |
330 | return ret; | |
331 | ret = indio_dev->info->write_event_value(indio_dev, | |
332 | this_attr->c, iio_ev_attr_type(this_attr), | |
333 | iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), | |
334 | val, val2); | |
0a769a95 LPC |
335 | if (ret < 0) |
336 | return ret; | |
337 | ||
338 | return len; | |
339 | } | |
340 | ||
b4e3ac0a LPC |
341 | static int iio_device_add_event(struct iio_dev *indio_dev, |
342 | const struct iio_chan_spec *chan, unsigned int spec_index, | |
343 | enum iio_event_type type, enum iio_event_direction dir, | |
344 | enum iio_shared_by shared_by, const unsigned long *mask) | |
345 | { | |
346 | ssize_t (*show)(struct device *, struct device_attribute *, char *); | |
347 | ssize_t (*store)(struct device *, struct device_attribute *, | |
348 | const char *, size_t); | |
349 | unsigned int attrcount = 0; | |
350 | unsigned int i; | |
351 | char *postfix; | |
352 | int ret; | |
353 | ||
ef4b4856 JC |
354 | for_each_set_bit(i, mask, sizeof(*mask)*8) { |
355 | if (i >= ARRAY_SIZE(iio_ev_info_text)) | |
356 | return -EINVAL; | |
1843c2f3 IT |
357 | if (dir != IIO_EV_DIR_NONE) |
358 | postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
359 | iio_ev_type_text[type], | |
360 | iio_ev_dir_text[dir], | |
361 | iio_ev_info_text[i]); | |
362 | else | |
363 | postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
364 | iio_ev_type_text[type], | |
365 | iio_ev_info_text[i]); | |
b4e3ac0a LPC |
366 | if (postfix == NULL) |
367 | return -ENOMEM; | |
368 | ||
369 | if (i == IIO_EV_INFO_ENABLE) { | |
370 | show = iio_ev_state_show; | |
371 | store = iio_ev_state_store; | |
372 | } else { | |
373 | show = iio_ev_value_show; | |
374 | store = iio_ev_value_store; | |
375 | } | |
376 | ||
377 | ret = __iio_add_chan_devattr(postfix, chan, show, store, | |
378 | (i << 16) | spec_index, shared_by, &indio_dev->dev, | |
379 | &indio_dev->event_interface->dev_attr_list); | |
380 | kfree(postfix); | |
381 | ||
78b33216 SP |
382 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
383 | continue; | |
384 | ||
b4e3ac0a LPC |
385 | if (ret) |
386 | return ret; | |
387 | ||
388 | attrcount++; | |
389 | } | |
390 | ||
391 | return attrcount; | |
392 | } | |
393 | ||
cb955852 | 394 | static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, |
b4e3ac0a LPC |
395 | struct iio_chan_spec const *chan) |
396 | { | |
397 | int ret = 0, i, attrcount = 0; | |
398 | enum iio_event_direction dir; | |
399 | enum iio_event_type type; | |
400 | ||
401 | for (i = 0; i < chan->num_event_specs; i++) { | |
402 | type = chan->event_spec[i].type; | |
403 | dir = chan->event_spec[i].dir; | |
404 | ||
405 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
406 | IIO_SEPARATE, &chan->event_spec[i].mask_separate); | |
407 | if (ret < 0) | |
92825ff9 | 408 | return ret; |
b4e3ac0a LPC |
409 | attrcount += ret; |
410 | ||
411 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
412 | IIO_SHARED_BY_TYPE, | |
413 | &chan->event_spec[i].mask_shared_by_type); | |
414 | if (ret < 0) | |
92825ff9 | 415 | return ret; |
b4e3ac0a LPC |
416 | attrcount += ret; |
417 | ||
418 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
419 | IIO_SHARED_BY_DIR, | |
420 | &chan->event_spec[i].mask_shared_by_dir); | |
421 | if (ret < 0) | |
92825ff9 | 422 | return ret; |
b4e3ac0a LPC |
423 | attrcount += ret; |
424 | ||
425 | ret = iio_device_add_event(indio_dev, chan, i, type, dir, | |
426 | IIO_SHARED_BY_ALL, | |
427 | &chan->event_spec[i].mask_shared_by_all); | |
428 | if (ret < 0) | |
92825ff9 | 429 | return ret; |
b4e3ac0a LPC |
430 | attrcount += ret; |
431 | } | |
432 | ret = attrcount; | |
b4e3ac0a LPC |
433 | return ret; |
434 | } | |
435 | ||
0a769a95 LPC |
436 | static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) |
437 | { | |
438 | int j, ret, attrcount = 0; | |
439 | ||
2179aabe | 440 | /* Dynamically created from the channels array */ |
0a769a95 LPC |
441 | for (j = 0; j < indio_dev->num_channels; j++) { |
442 | ret = iio_device_add_event_sysfs(indio_dev, | |
443 | &indio_dev->channels[j]); | |
444 | if (ret < 0) | |
e3db9ef6 | 445 | return ret; |
0a769a95 LPC |
446 | attrcount += ret; |
447 | } | |
448 | return attrcount; | |
0a769a95 LPC |
449 | } |
450 | ||
451 | static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) | |
452 | { | |
453 | int j; | |
454 | ||
b4e3ac0a | 455 | for (j = 0; j < indio_dev->num_channels; j++) { |
b4e3ac0a LPC |
456 | if (indio_dev->channels[j].num_event_specs != 0) |
457 | return true; | |
458 | } | |
0a769a95 LPC |
459 | return false; |
460 | } | |
461 | ||
462 | static void iio_setup_ev_int(struct iio_event_interface *ev_int) | |
463 | { | |
2c00193f | 464 | INIT_KFIFO(ev_int->det_events); |
0a769a95 | 465 | init_waitqueue_head(&ev_int->wait); |
b91accaf | 466 | mutex_init(&ev_int->read_lock); |
0a769a95 LPC |
467 | } |
468 | ||
469 | static const char *iio_event_group_name = "events"; | |
470 | int iio_device_register_eventset(struct iio_dev *indio_dev) | |
471 | { | |
472 | struct iio_dev_attr *p; | |
473 | int ret = 0, attrcount_orig = 0, attrcount, attrn; | |
474 | struct attribute **attr; | |
475 | ||
476 | if (!(indio_dev->info->event_attrs || | |
477 | iio_check_for_dynamic_events(indio_dev))) | |
478 | return 0; | |
479 | ||
480 | indio_dev->event_interface = | |
481 | kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); | |
92825ff9 HK |
482 | if (indio_dev->event_interface == NULL) |
483 | return -ENOMEM; | |
0a769a95 | 484 | |
46b24311 SH |
485 | INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); |
486 | ||
0a769a95 LPC |
487 | iio_setup_ev_int(indio_dev->event_interface); |
488 | if (indio_dev->info->event_attrs != NULL) { | |
489 | attr = indio_dev->info->event_attrs->attrs; | |
490 | while (*attr++ != NULL) | |
491 | attrcount_orig++; | |
492 | } | |
493 | attrcount = attrcount_orig; | |
494 | if (indio_dev->channels) { | |
495 | ret = __iio_add_event_config_attrs(indio_dev); | |
496 | if (ret < 0) | |
497 | goto error_free_setup_event_lines; | |
498 | attrcount += ret; | |
499 | } | |
500 | ||
501 | indio_dev->event_interface->group.name = iio_event_group_name; | |
502 | indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1, | |
503 | sizeof(indio_dev->event_interface->group.attrs[0]), | |
504 | GFP_KERNEL); | |
505 | if (indio_dev->event_interface->group.attrs == NULL) { | |
506 | ret = -ENOMEM; | |
507 | goto error_free_setup_event_lines; | |
508 | } | |
509 | if (indio_dev->info->event_attrs) | |
510 | memcpy(indio_dev->event_interface->group.attrs, | |
511 | indio_dev->info->event_attrs->attrs, | |
512 | sizeof(indio_dev->event_interface->group.attrs[0]) | |
513 | *attrcount_orig); | |
514 | attrn = attrcount_orig; | |
515 | /* Add all elements from the list. */ | |
516 | list_for_each_entry(p, | |
517 | &indio_dev->event_interface->dev_attr_list, | |
518 | l) | |
519 | indio_dev->event_interface->group.attrs[attrn++] = | |
520 | &p->dev_attr.attr; | |
521 | indio_dev->groups[indio_dev->groupcounter++] = | |
522 | &indio_dev->event_interface->group; | |
523 | ||
524 | return 0; | |
525 | ||
526 | error_free_setup_event_lines: | |
84088ebd | 527 | iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); |
0a769a95 | 528 | kfree(indio_dev->event_interface); |
c1b03ab5 | 529 | indio_dev->event_interface = NULL; |
0a769a95 LPC |
530 | return ret; |
531 | } | |
532 | ||
d2f0a48f LPC |
533 | /** |
534 | * iio_device_wakeup_eventset - Wakes up the event waitqueue | |
535 | * @indio_dev: The IIO device | |
536 | * | |
537 | * Wakes up the event waitqueue used for poll() and blocking read(). | |
538 | * Should usually be called when the device is unregistered. | |
539 | */ | |
540 | void iio_device_wakeup_eventset(struct iio_dev *indio_dev) | |
541 | { | |
542 | if (indio_dev->event_interface == NULL) | |
543 | return; | |
544 | wake_up(&indio_dev->event_interface->wait); | |
545 | } | |
546 | ||
0a769a95 LPC |
547 | void iio_device_unregister_eventset(struct iio_dev *indio_dev) |
548 | { | |
549 | if (indio_dev->event_interface == NULL) | |
550 | return; | |
84088ebd | 551 | iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); |
0a769a95 LPC |
552 | kfree(indio_dev->event_interface->group.attrs); |
553 | kfree(indio_dev->event_interface); | |
554 | } |