1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* The industrial I/O core, trigger handling functions |
3 | * |
4 | * Copyright (c) 2008 Jonathan Cameron |
5 | */ |
6 | |
7 | #include <linux/kernel.h> |
8 | #include <linux/idr.h> |
9 | #include <linux/err.h> |
10 | #include <linux/device.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/list.h> |
13 | #include <linux/slab.h> |
14 | |
15 | #include <linux/iio/iio.h> |
16 | #include <linux/iio/iio-opaque.h> |
17 | #include <linux/iio/trigger.h> |
18 | #include "iio_core.h" |
19 | #include "iio_core_trigger.h" |
20 | #include <linux/iio/trigger_consumer.h> |
21 | |
22 | /* RFC - Question of approach |
23 | * Make the common case (single sensor single trigger) |
24 | * simple by starting trigger capture from when first sensors |
25 | * is added. |
26 | * |
27 | * Complex simultaneous start requires use of 'hold' functionality |
28 | * of the trigger. (not implemented) |
29 | * |
30 | * Any other suggestions? |
31 | */ |
32 | |
33 | static DEFINE_IDA(iio_trigger_ida); |
34 | |
35 | /* Single list of all available triggers */ |
36 | static LIST_HEAD(iio_trigger_list); |
37 | static DEFINE_MUTEX(iio_trigger_list_lock); |
38 | |
39 | /** |
40 | * name_show() - retrieve useful identifying name |
41 | * @dev: device associated with the iio_trigger |
42 | * @attr: pointer to the device_attribute structure that is |
43 | * being processed |
44 | * @buf: buffer to print the name into |
45 | * |
46 | * Return: a negative number on failure or the number of written |
47 | * characters on success. |
48 | */ |
49 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
50 | char *buf) |
51 | { |
52 | struct iio_trigger *trig = to_iio_trigger(d: dev); |
53 | |
54 | return sysfs_emit(buf, fmt: "%s\n" , trig->name); |
55 | } |
56 | |
57 | static DEVICE_ATTR_RO(name); |
58 | |
59 | static struct attribute *iio_trig_dev_attrs[] = { |
60 | &dev_attr_name.attr, |
61 | NULL, |
62 | }; |
63 | ATTRIBUTE_GROUPS(iio_trig_dev); |
64 | |
65 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name); |
66 | |
67 | int iio_trigger_register(struct iio_trigger *trig_info) |
68 | { |
69 | int ret; |
70 | |
71 | trig_info->id = ida_alloc(ida: &iio_trigger_ida, GFP_KERNEL); |
72 | if (trig_info->id < 0) |
73 | return trig_info->id; |
74 | |
75 | /* Set the name used for the sysfs directory etc */ |
76 | dev_set_name(dev: &trig_info->dev, name: "trigger%d" , trig_info->id); |
77 | |
78 | ret = device_add(dev: &trig_info->dev); |
79 | if (ret) |
80 | goto error_unregister_id; |
81 | |
82 | /* Add to list of available triggers held by the IIO core */ |
83 | mutex_lock(&iio_trigger_list_lock); |
84 | if (__iio_trigger_find_by_name(name: trig_info->name)) { |
85 | pr_err("Duplicate trigger name '%s'\n" , trig_info->name); |
86 | ret = -EEXIST; |
87 | goto error_device_del; |
88 | } |
89 | list_add_tail(new: &trig_info->list, head: &iio_trigger_list); |
90 | mutex_unlock(lock: &iio_trigger_list_lock); |
91 | |
92 | return 0; |
93 | |
94 | error_device_del: |
95 | mutex_unlock(lock: &iio_trigger_list_lock); |
96 | device_del(dev: &trig_info->dev); |
97 | error_unregister_id: |
98 | ida_free(&iio_trigger_ida, id: trig_info->id); |
99 | return ret; |
100 | } |
101 | EXPORT_SYMBOL(iio_trigger_register); |
102 | |
103 | void iio_trigger_unregister(struct iio_trigger *trig_info) |
104 | { |
105 | mutex_lock(&iio_trigger_list_lock); |
106 | list_del(entry: &trig_info->list); |
107 | mutex_unlock(lock: &iio_trigger_list_lock); |
108 | |
109 | ida_free(&iio_trigger_ida, id: trig_info->id); |
110 | /* Possible issue in here */ |
111 | device_del(dev: &trig_info->dev); |
112 | } |
113 | EXPORT_SYMBOL(iio_trigger_unregister); |
114 | |
115 | int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig) |
116 | { |
117 | struct iio_dev_opaque *iio_dev_opaque; |
118 | |
119 | if (!indio_dev || !trig) |
120 | return -EINVAL; |
121 | |
122 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
123 | mutex_lock(&iio_dev_opaque->mlock); |
124 | WARN_ON(iio_dev_opaque->trig_readonly); |
125 | |
126 | indio_dev->trig = iio_trigger_get(trig); |
127 | iio_dev_opaque->trig_readonly = true; |
128 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
129 | |
130 | return 0; |
131 | } |
132 | EXPORT_SYMBOL(iio_trigger_set_immutable); |
133 | |
134 | /* Search for trigger by name, assuming iio_trigger_list_lock held */ |
135 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name) |
136 | { |
137 | struct iio_trigger *iter; |
138 | |
139 | list_for_each_entry(iter, &iio_trigger_list, list) |
140 | if (!strcmp(iter->name, name)) |
141 | return iter; |
142 | |
143 | return NULL; |
144 | } |
145 | |
146 | static struct iio_trigger *iio_trigger_acquire_by_name(const char *name) |
147 | { |
148 | struct iio_trigger *trig = NULL, *iter; |
149 | |
150 | mutex_lock(&iio_trigger_list_lock); |
151 | list_for_each_entry(iter, &iio_trigger_list, list) |
152 | if (sysfs_streq(s1: iter->name, s2: name)) { |
153 | trig = iter; |
154 | iio_trigger_get(trig); |
155 | break; |
156 | } |
157 | mutex_unlock(lock: &iio_trigger_list_lock); |
158 | |
159 | return trig; |
160 | } |
161 | |
162 | static void iio_reenable_work_fn(struct work_struct *work) |
163 | { |
164 | struct iio_trigger *trig = container_of(work, struct iio_trigger, |
165 | reenable_work); |
166 | |
167 | /* |
168 | * This 'might' occur after the trigger state is set to disabled - |
169 | * in that case the driver should skip reenabling. |
170 | */ |
171 | trig->ops->reenable(trig); |
172 | } |
173 | |
174 | /* |
175 | * In general, reenable callbacks may need to sleep and this path is |
176 | * not performance sensitive, so just queue up a work item |
177 | * to reneable the trigger for us. |
178 | * |
179 | * Races that can cause this. |
180 | * 1) A handler occurs entirely in interrupt context so the counter |
181 | * the final decrement is still in this interrupt. |
182 | * 2) The trigger has been removed, but one last interrupt gets through. |
183 | * |
184 | * For (1) we must call reenable, but not in atomic context. |
185 | * For (2) it should be safe to call reenanble, if drivers never blindly |
186 | * reenable after state is off. |
187 | */ |
188 | static void iio_trigger_notify_done_atomic(struct iio_trigger *trig) |
189 | { |
190 | if (atomic_dec_and_test(v: &trig->use_count) && trig->ops && |
191 | trig->ops->reenable) |
192 | schedule_work(work: &trig->reenable_work); |
193 | } |
194 | |
195 | /** |
196 | * iio_trigger_poll() - Call the IRQ trigger handler of the consumers |
197 | * @trig: trigger which occurred |
198 | * |
199 | * This function should only be called from a hard IRQ context. |
200 | */ |
201 | void iio_trigger_poll(struct iio_trigger *trig) |
202 | { |
203 | int i; |
204 | |
205 | if (!atomic_read(v: &trig->use_count)) { |
206 | atomic_set(v: &trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
207 | |
208 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
209 | if (trig->subirqs[i].enabled) |
210 | generic_handle_irq(irq: trig->subirq_base + i); |
211 | else |
212 | iio_trigger_notify_done_atomic(trig); |
213 | } |
214 | } |
215 | } |
216 | EXPORT_SYMBOL(iio_trigger_poll); |
217 | |
218 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) |
219 | { |
220 | iio_trigger_poll(private); |
221 | return IRQ_HANDLED; |
222 | } |
223 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); |
224 | |
225 | /** |
226 | * iio_trigger_poll_nested() - Call the threaded trigger handler of the |
227 | * consumers |
228 | * @trig: trigger which occurred |
229 | * |
230 | * This function should only be called from a kernel thread context. |
231 | */ |
232 | void iio_trigger_poll_nested(struct iio_trigger *trig) |
233 | { |
234 | int i; |
235 | |
236 | if (!atomic_read(v: &trig->use_count)) { |
237 | atomic_set(v: &trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
238 | |
239 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
240 | if (trig->subirqs[i].enabled) |
241 | handle_nested_irq(irq: trig->subirq_base + i); |
242 | else |
243 | iio_trigger_notify_done(trig); |
244 | } |
245 | } |
246 | } |
247 | EXPORT_SYMBOL(iio_trigger_poll_nested); |
248 | |
249 | void iio_trigger_notify_done(struct iio_trigger *trig) |
250 | { |
251 | if (atomic_dec_and_test(v: &trig->use_count) && trig->ops && |
252 | trig->ops->reenable) |
253 | trig->ops->reenable(trig); |
254 | } |
255 | EXPORT_SYMBOL(iio_trigger_notify_done); |
256 | |
257 | /* Trigger Consumer related functions */ |
258 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
259 | { |
260 | int ret; |
261 | |
262 | mutex_lock(&trig->pool_lock); |
263 | ret = bitmap_find_free_region(bitmap: trig->pool, |
264 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, |
265 | ilog2(1)); |
266 | mutex_unlock(lock: &trig->pool_lock); |
267 | if (ret >= 0) |
268 | ret += trig->subirq_base; |
269 | |
270 | return ret; |
271 | } |
272 | |
273 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) |
274 | { |
275 | mutex_lock(&trig->pool_lock); |
276 | clear_bit(nr: irq - trig->subirq_base, addr: trig->pool); |
277 | mutex_unlock(lock: &trig->pool_lock); |
278 | } |
279 | |
280 | /* Complexity in here. With certain triggers (datardy) an acknowledgement |
281 | * may be needed if the pollfuncs do not include the data read for the |
282 | * triggering device. |
283 | * This is not currently handled. Alternative of not enabling trigger unless |
284 | * the relevant function is in there may be the best option. |
285 | */ |
286 | /* Worth protecting against double additions? */ |
287 | int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
288 | struct iio_poll_func *pf) |
289 | { |
290 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
291 | bool notinuse = |
292 | bitmap_empty(src: trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
293 | int ret = 0; |
294 | |
295 | /* Prevent the module from being removed whilst attached to a trigger */ |
296 | __module_get(module: iio_dev_opaque->driver_module); |
297 | |
298 | /* Get irq number */ |
299 | pf->irq = iio_trigger_get_irq(trig); |
300 | if (pf->irq < 0) { |
301 | pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n" , |
302 | trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
303 | goto out_put_module; |
304 | } |
305 | |
306 | /* Request irq */ |
307 | ret = request_threaded_irq(irq: pf->irq, handler: pf->h, thread_fn: pf->thread, |
308 | flags: pf->type, name: pf->name, |
309 | dev: pf); |
310 | if (ret < 0) |
311 | goto out_put_irq; |
312 | |
313 | /* Enable trigger in driver */ |
314 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
315 | ret = trig->ops->set_trigger_state(trig, true); |
316 | if (ret) |
317 | goto out_free_irq; |
318 | } |
319 | |
320 | /* |
321 | * Check if we just registered to our own trigger: we determine that |
322 | * this is the case if the IIO device and the trigger device share the |
323 | * same parent device. |
324 | */ |
325 | if (iio_validate_own_trigger(idev: pf->indio_dev, trig)) |
326 | trig->attached_own_device = true; |
327 | |
328 | return ret; |
329 | |
330 | out_free_irq: |
331 | free_irq(pf->irq, pf); |
332 | out_put_irq: |
333 | iio_trigger_put_irq(trig, irq: pf->irq); |
334 | out_put_module: |
335 | module_put(module: iio_dev_opaque->driver_module); |
336 | return ret; |
337 | } |
338 | |
339 | int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
340 | struct iio_poll_func *pf) |
341 | { |
342 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
343 | bool no_other_users = |
344 | bitmap_weight(src: trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER) == 1; |
345 | int ret = 0; |
346 | |
347 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
348 | ret = trig->ops->set_trigger_state(trig, false); |
349 | if (ret) |
350 | return ret; |
351 | } |
352 | if (pf->indio_dev->dev.parent == trig->dev.parent) |
353 | trig->attached_own_device = false; |
354 | iio_trigger_put_irq(trig, irq: pf->irq); |
355 | free_irq(pf->irq, pf); |
356 | module_put(module: iio_dev_opaque->driver_module); |
357 | |
358 | return ret; |
359 | } |
360 | |
361 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
362 | { |
363 | struct iio_poll_func *pf = p; |
364 | |
365 | pf->timestamp = iio_get_time_ns(indio_dev: pf->indio_dev); |
366 | return IRQ_WAKE_THREAD; |
367 | } |
368 | EXPORT_SYMBOL(iio_pollfunc_store_time); |
369 | |
370 | struct iio_poll_func |
371 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), |
372 | irqreturn_t (*thread)(int irq, void *p), |
373 | int type, |
374 | struct iio_dev *indio_dev, |
375 | const char *fmt, |
376 | ...) |
377 | { |
378 | va_list vargs; |
379 | struct iio_poll_func *pf; |
380 | |
381 | pf = kmalloc(size: sizeof(*pf), GFP_KERNEL); |
382 | if (!pf) |
383 | return NULL; |
384 | va_start(vargs, fmt); |
385 | pf->name = kvasprintf(GFP_KERNEL, fmt, args: vargs); |
386 | va_end(vargs); |
387 | if (pf->name == NULL) { |
388 | kfree(objp: pf); |
389 | return NULL; |
390 | } |
391 | pf->h = h; |
392 | pf->thread = thread; |
393 | pf->type = type; |
394 | pf->indio_dev = indio_dev; |
395 | |
396 | return pf; |
397 | } |
398 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); |
399 | |
400 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) |
401 | { |
402 | kfree(objp: pf->name); |
403 | kfree(objp: pf); |
404 | } |
405 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); |
406 | |
407 | /** |
408 | * current_trigger_show() - trigger consumer sysfs query current trigger |
409 | * @dev: device associated with an industrial I/O device |
410 | * @attr: pointer to the device_attribute structure that |
411 | * is being processed |
412 | * @buf: buffer where the current trigger name will be printed into |
413 | * |
414 | * For trigger consumers the current_trigger interface allows the trigger |
415 | * used by the device to be queried. |
416 | * |
417 | * Return: a negative number on failure, the number of characters written |
418 | * on success or 0 if no trigger is available |
419 | */ |
420 | static ssize_t current_trigger_show(struct device *dev, |
421 | struct device_attribute *attr, char *buf) |
422 | { |
423 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
424 | |
425 | if (indio_dev->trig) |
426 | return sysfs_emit(buf, fmt: "%s\n" , indio_dev->trig->name); |
427 | return 0; |
428 | } |
429 | |
430 | /** |
431 | * current_trigger_store() - trigger consumer sysfs set current trigger |
432 | * @dev: device associated with an industrial I/O device |
433 | * @attr: device attribute that is being processed |
434 | * @buf: string buffer that holds the name of the trigger |
435 | * @len: length of the trigger name held by buf |
436 | * |
437 | * For trigger consumers the current_trigger interface allows the trigger |
438 | * used for this device to be specified at run time based on the trigger's |
439 | * name. |
440 | * |
441 | * Return: negative error code on failure or length of the buffer |
442 | * on success |
443 | */ |
444 | static ssize_t current_trigger_store(struct device *dev, |
445 | struct device_attribute *attr, |
446 | const char *buf, size_t len) |
447 | { |
448 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
449 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
450 | struct iio_trigger *oldtrig = indio_dev->trig; |
451 | struct iio_trigger *trig; |
452 | int ret; |
453 | |
454 | mutex_lock(&iio_dev_opaque->mlock); |
455 | if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) { |
456 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
457 | return -EBUSY; |
458 | } |
459 | if (iio_dev_opaque->trig_readonly) { |
460 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
461 | return -EPERM; |
462 | } |
463 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
464 | |
465 | trig = iio_trigger_acquire_by_name(name: buf); |
466 | if (oldtrig == trig) { |
467 | ret = len; |
468 | goto out_trigger_put; |
469 | } |
470 | |
471 | if (trig && indio_dev->info->validate_trigger) { |
472 | ret = indio_dev->info->validate_trigger(indio_dev, trig); |
473 | if (ret) |
474 | goto out_trigger_put; |
475 | } |
476 | |
477 | if (trig && trig->ops && trig->ops->validate_device) { |
478 | ret = trig->ops->validate_device(trig, indio_dev); |
479 | if (ret) |
480 | goto out_trigger_put; |
481 | } |
482 | |
483 | indio_dev->trig = trig; |
484 | |
485 | if (oldtrig) { |
486 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
487 | iio_trigger_detach_poll_func(trig: oldtrig, |
488 | pf: indio_dev->pollfunc_event); |
489 | iio_trigger_put(trig: oldtrig); |
490 | } |
491 | if (indio_dev->trig) { |
492 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
493 | iio_trigger_attach_poll_func(trig: indio_dev->trig, |
494 | pf: indio_dev->pollfunc_event); |
495 | } |
496 | |
497 | return len; |
498 | |
499 | out_trigger_put: |
500 | if (trig) |
501 | iio_trigger_put(trig); |
502 | return ret; |
503 | } |
504 | |
505 | static DEVICE_ATTR_RW(current_trigger); |
506 | |
507 | static struct attribute *iio_trigger_consumer_attrs[] = { |
508 | &dev_attr_current_trigger.attr, |
509 | NULL, |
510 | }; |
511 | |
512 | static const struct attribute_group iio_trigger_consumer_attr_group = { |
513 | .name = "trigger" , |
514 | .attrs = iio_trigger_consumer_attrs, |
515 | }; |
516 | |
517 | static void iio_trig_release(struct device *device) |
518 | { |
519 | struct iio_trigger *trig = to_iio_trigger(d: device); |
520 | int i; |
521 | |
522 | if (trig->subirq_base) { |
523 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
524 | irq_modify_status(irq: trig->subirq_base + i, |
525 | clr: IRQ_NOAUTOEN, |
526 | set: IRQ_NOREQUEST | IRQ_NOPROBE); |
527 | irq_set_chip(irq: trig->subirq_base + i, |
528 | NULL); |
529 | irq_set_handler(irq: trig->subirq_base + i, |
530 | NULL); |
531 | } |
532 | |
533 | irq_free_descs(irq: trig->subirq_base, |
534 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
535 | } |
536 | kfree(objp: trig->name); |
537 | kfree(objp: trig); |
538 | } |
539 | |
540 | static const struct device_type iio_trig_type = { |
541 | .release = iio_trig_release, |
542 | .groups = iio_trig_dev_groups, |
543 | }; |
544 | |
545 | static void iio_trig_subirqmask(struct irq_data *d) |
546 | { |
547 | struct irq_chip *chip = irq_data_get_irq_chip(d); |
548 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
549 | |
550 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; |
551 | } |
552 | |
553 | static void iio_trig_subirqunmask(struct irq_data *d) |
554 | { |
555 | struct irq_chip *chip = irq_data_get_irq_chip(d); |
556 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
557 | |
558 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; |
559 | } |
560 | |
561 | static __printf(3, 0) |
562 | struct iio_trigger *viio_trigger_alloc(struct device *parent, |
563 | struct module *this_mod, |
564 | const char *fmt, |
565 | va_list vargs) |
566 | { |
567 | struct iio_trigger *trig; |
568 | int i; |
569 | |
570 | trig = kzalloc(size: sizeof(*trig), GFP_KERNEL); |
571 | if (!trig) |
572 | return NULL; |
573 | |
574 | trig->dev.parent = parent; |
575 | trig->dev.type = &iio_trig_type; |
576 | trig->dev.bus = &iio_bus_type; |
577 | device_initialize(dev: &trig->dev); |
578 | INIT_WORK(&trig->reenable_work, iio_reenable_work_fn); |
579 | |
580 | mutex_init(&trig->pool_lock); |
581 | trig->subirq_base = irq_alloc_descs(-1, 0, |
582 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, |
583 | 0); |
584 | if (trig->subirq_base < 0) |
585 | goto free_trig; |
586 | |
587 | trig->name = kvasprintf(GFP_KERNEL, fmt, args: vargs); |
588 | if (trig->name == NULL) |
589 | goto free_descs; |
590 | |
591 | INIT_LIST_HEAD(list: &trig->list); |
592 | |
593 | trig->owner = this_mod; |
594 | |
595 | trig->subirq_chip.name = trig->name; |
596 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; |
597 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; |
598 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
599 | irq_set_chip(irq: trig->subirq_base + i, chip: &trig->subirq_chip); |
600 | irq_set_handler(irq: trig->subirq_base + i, handle: &handle_simple_irq); |
601 | irq_modify_status(irq: trig->subirq_base + i, |
602 | clr: IRQ_NOREQUEST | IRQ_NOAUTOEN, set: IRQ_NOPROBE); |
603 | } |
604 | |
605 | return trig; |
606 | |
607 | free_descs: |
608 | irq_free_descs(irq: trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
609 | free_trig: |
610 | kfree(objp: trig); |
611 | return NULL; |
612 | } |
613 | |
614 | /** |
615 | * __iio_trigger_alloc - Allocate a trigger |
616 | * @parent: Device to allocate iio_trigger for |
617 | * @this_mod: module allocating the trigger |
618 | * @fmt: trigger name format. If it includes format |
619 | * specifiers, the additional arguments following |
620 | * format are formatted and inserted in the resulting |
621 | * string replacing their respective specifiers. |
622 | * RETURNS: |
623 | * Pointer to allocated iio_trigger on success, NULL on failure. |
624 | */ |
625 | struct iio_trigger *__iio_trigger_alloc(struct device *parent, |
626 | struct module *this_mod, |
627 | const char *fmt, ...) |
628 | { |
629 | struct iio_trigger *trig; |
630 | va_list vargs; |
631 | |
632 | va_start(vargs, fmt); |
633 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
634 | va_end(vargs); |
635 | |
636 | return trig; |
637 | } |
638 | EXPORT_SYMBOL(__iio_trigger_alloc); |
639 | |
640 | void iio_trigger_free(struct iio_trigger *trig) |
641 | { |
642 | if (trig) |
643 | put_device(dev: &trig->dev); |
644 | } |
645 | EXPORT_SYMBOL(iio_trigger_free); |
646 | |
647 | static void devm_iio_trigger_release(struct device *dev, void *res) |
648 | { |
649 | iio_trigger_free(*(struct iio_trigger **)res); |
650 | } |
651 | |
652 | /** |
653 | * __devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() |
654 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is |
655 | * automatically freed on driver detach. |
656 | * @parent: Device to allocate iio_trigger for |
657 | * @this_mod: module allocating the trigger |
658 | * @fmt: trigger name format. If it includes format |
659 | * specifiers, the additional arguments following |
660 | * format are formatted and inserted in the resulting |
661 | * string replacing their respective specifiers. |
662 | * |
663 | * |
664 | * RETURNS: |
665 | * Pointer to allocated iio_trigger on success, NULL on failure. |
666 | */ |
667 | struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, |
668 | struct module *this_mod, |
669 | const char *fmt, ...) |
670 | { |
671 | struct iio_trigger **ptr, *trig; |
672 | va_list vargs; |
673 | |
674 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), |
675 | GFP_KERNEL); |
676 | if (!ptr) |
677 | return NULL; |
678 | |
679 | /* use raw alloc_dr for kmalloc caller tracing */ |
680 | va_start(vargs, fmt); |
681 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
682 | va_end(vargs); |
683 | if (trig) { |
684 | *ptr = trig; |
685 | devres_add(dev: parent, res: ptr); |
686 | } else { |
687 | devres_free(res: ptr); |
688 | } |
689 | |
690 | return trig; |
691 | } |
692 | EXPORT_SYMBOL_GPL(__devm_iio_trigger_alloc); |
693 | |
694 | static void devm_iio_trigger_unreg(void *trigger_info) |
695 | { |
696 | iio_trigger_unregister(trigger_info); |
697 | } |
698 | |
699 | /** |
700 | * devm_iio_trigger_register - Resource-managed iio_trigger_register() |
701 | * @dev: device this trigger was allocated for |
702 | * @trig_info: trigger to register |
703 | * |
704 | * Managed iio_trigger_register(). The IIO trigger registered with this |
705 | * function is automatically unregistered on driver detach. This function |
706 | * calls iio_trigger_register() internally. Refer to that function for more |
707 | * information. |
708 | * |
709 | * RETURNS: |
710 | * 0 on success, negative error number on failure. |
711 | */ |
712 | int devm_iio_trigger_register(struct device *dev, |
713 | struct iio_trigger *trig_info) |
714 | { |
715 | int ret; |
716 | |
717 | ret = iio_trigger_register(trig_info); |
718 | if (ret) |
719 | return ret; |
720 | |
721 | return devm_add_action_or_reset(dev, devm_iio_trigger_unreg, trig_info); |
722 | } |
723 | EXPORT_SYMBOL_GPL(devm_iio_trigger_register); |
724 | |
725 | bool iio_trigger_using_own(struct iio_dev *indio_dev) |
726 | { |
727 | return indio_dev->trig->attached_own_device; |
728 | } |
729 | EXPORT_SYMBOL(iio_trigger_using_own); |
730 | |
731 | /** |
732 | * iio_validate_own_trigger - Check if a trigger and IIO device belong to |
733 | * the same device |
734 | * @idev: the IIO device to check |
735 | * @trig: the IIO trigger to check |
736 | * |
737 | * This function can be used as the validate_trigger callback for triggers that |
738 | * can only be attached to their own device. |
739 | * |
740 | * Return: 0 if both the trigger and the IIO device belong to the same |
741 | * device, -EINVAL otherwise. |
742 | */ |
743 | int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig) |
744 | { |
745 | if (idev->dev.parent != trig->dev.parent) |
746 | return -EINVAL; |
747 | return 0; |
748 | } |
749 | EXPORT_SYMBOL_GPL(iio_validate_own_trigger); |
750 | |
751 | /** |
752 | * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to |
753 | * the same device |
754 | * @trig: The IIO trigger to check |
755 | * @indio_dev: the IIO device to check |
756 | * |
757 | * This function can be used as the validate_device callback for triggers that |
758 | * can only be attached to their own device. |
759 | * |
760 | * Return: 0 if both the trigger and the IIO device belong to the same |
761 | * device, -EINVAL otherwise. |
762 | */ |
763 | int iio_trigger_validate_own_device(struct iio_trigger *trig, |
764 | struct iio_dev *indio_dev) |
765 | { |
766 | if (indio_dev->dev.parent != trig->dev.parent) |
767 | return -EINVAL; |
768 | return 0; |
769 | } |
770 | EXPORT_SYMBOL(iio_trigger_validate_own_device); |
771 | |
772 | int iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
773 | { |
774 | return iio_device_register_sysfs_group(indio_dev, |
775 | group: &iio_trigger_consumer_attr_group); |
776 | } |
777 | |
778 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
779 | { |
780 | /* Clean up an associated but not attached trigger reference */ |
781 | if (indio_dev->trig) |
782 | iio_trigger_put(trig: indio_dev->trig); |
783 | } |
784 | |