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1637db44 JC |
1 | /* The industrial I/O core, trigger handling functions |
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 | ||
10 | #include <linux/kernel.h> | |
1637db44 JC |
11 | #include <linux/idr.h> |
12 | #include <linux/err.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/list.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1637db44 | 17 | |
06458e27 JC |
18 | #include <linux/iio/iio.h> |
19 | #include <linux/iio/trigger.h> | |
df9c1c42 | 20 | #include "iio_core.h" |
6aea1c36 | 21 | #include "iio_core_trigger.h" |
06458e27 | 22 | #include <linux/iio/trigger_consumer.h> |
1637db44 JC |
23 | |
24 | /* RFC - Question of approach | |
25 | * Make the common case (single sensor single trigger) | |
26 | * simple by starting trigger capture from when first sensors | |
27 | * is added. | |
28 | * | |
29 | * Complex simultaneous start requires use of 'hold' functionality | |
30 | * of the trigger. (not implemented) | |
31 | * | |
32 | * Any other suggestions? | |
33 | */ | |
34 | ||
47c24fdd | 35 | static DEFINE_IDA(iio_trigger_ida); |
1637db44 JC |
36 | |
37 | /* Single list of all available triggers */ | |
38 | static LIST_HEAD(iio_trigger_list); | |
39 | static DEFINE_MUTEX(iio_trigger_list_lock); | |
40 | ||
59c85e82 JC |
41 | /** |
42 | * iio_trigger_read_name() - retrieve useful identifying name | |
43 | **/ | |
44 | static ssize_t iio_trigger_read_name(struct device *dev, | |
45 | struct device_attribute *attr, | |
46 | char *buf) | |
47 | { | |
971ff1db | 48 | struct iio_trigger *trig = to_iio_trigger(dev); |
59c85e82 JC |
49 | return sprintf(buf, "%s\n", trig->name); |
50 | } | |
51 | ||
52 | static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL); | |
53 | ||
6d459aa0 LPC |
54 | static struct attribute *iio_trig_dev_attrs[] = { |
55 | &dev_attr_name.attr, | |
56 | NULL, | |
57 | }; | |
f59c2576 | 58 | ATTRIBUTE_GROUPS(iio_trig_dev); |
1637db44 | 59 | |
1637db44 JC |
60 | int iio_trigger_register(struct iio_trigger *trig_info) |
61 | { | |
62 | int ret; | |
63 | ||
47c24fdd | 64 | trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL); |
92825ff9 HK |
65 | if (trig_info->id < 0) |
66 | return trig_info->id; | |
67 | ||
1637db44 JC |
68 | /* Set the name used for the sysfs directory etc */ |
69 | dev_set_name(&trig_info->dev, "trigger%ld", | |
70 | (unsigned long) trig_info->id); | |
71 | ||
72 | ret = device_add(&trig_info->dev); | |
73 | if (ret) | |
74 | goto error_unregister_id; | |
75 | ||
1637db44 JC |
76 | /* Add to list of available triggers held by the IIO core */ |
77 | mutex_lock(&iio_trigger_list_lock); | |
78 | list_add_tail(&trig_info->list, &iio_trigger_list); | |
79 | mutex_unlock(&iio_trigger_list_lock); | |
80 | ||
81 | return 0; | |
82 | ||
1637db44 | 83 | error_unregister_id: |
47c24fdd | 84 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 JC |
85 | return ret; |
86 | } | |
87 | EXPORT_SYMBOL(iio_trigger_register); | |
88 | ||
89 | void iio_trigger_unregister(struct iio_trigger *trig_info) | |
90 | { | |
1637db44 | 91 | mutex_lock(&iio_trigger_list_lock); |
582e5489 | 92 | list_del(&trig_info->list); |
1637db44 JC |
93 | mutex_unlock(&iio_trigger_list_lock); |
94 | ||
47c24fdd | 95 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 | 96 | /* Possible issue in here */ |
8bade406 | 97 | device_del(&trig_info->dev); |
1637db44 JC |
98 | } |
99 | EXPORT_SYMBOL(iio_trigger_unregister); | |
100 | ||
f6517f22 JC |
101 | static struct iio_trigger *iio_trigger_find_by_name(const char *name, |
102 | size_t len) | |
1637db44 | 103 | { |
f6517f22 | 104 | struct iio_trigger *trig = NULL, *iter; |
7c327857 | 105 | |
1637db44 | 106 | mutex_lock(&iio_trigger_list_lock); |
f6517f22 JC |
107 | list_for_each_entry(iter, &iio_trigger_list, list) |
108 | if (sysfs_streq(iter->name, name)) { | |
109 | trig = iter; | |
1637db44 JC |
110 | break; |
111 | } | |
1637db44 JC |
112 | mutex_unlock(&iio_trigger_list_lock); |
113 | ||
f6517f22 | 114 | return trig; |
5f87404d | 115 | } |
1637db44 | 116 | |
398fd22b | 117 | void iio_trigger_poll(struct iio_trigger *trig) |
1637db44 | 118 | { |
d96d1337 | 119 | int i; |
a1a8e1dc LPC |
120 | |
121 | if (!atomic_read(&trig->use_count)) { | |
122 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
123 | ||
124 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
125 | if (trig->subirqs[i].enabled) | |
d96d1337 | 126 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
127 | else |
128 | iio_trigger_notify_done(trig); | |
129 | } | |
130 | } | |
1637db44 JC |
131 | } |
132 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
133 | |
134 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
135 | { | |
398fd22b | 136 | iio_trigger_poll(private); |
8384d957 JC |
137 | return IRQ_HANDLED; |
138 | } | |
139 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 140 | |
398fd22b | 141 | void iio_trigger_poll_chained(struct iio_trigger *trig) |
1f785681 JC |
142 | { |
143 | int i; | |
a1a8e1dc LPC |
144 | |
145 | if (!atomic_read(&trig->use_count)) { | |
146 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
147 | ||
148 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
149 | if (trig->subirqs[i].enabled) | |
1f785681 | 150 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
151 | else |
152 | iio_trigger_notify_done(trig); | |
153 | } | |
154 | } | |
1f785681 JC |
155 | } |
156 | EXPORT_SYMBOL(iio_trigger_poll_chained); | |
157 | ||
1637db44 JC |
158 | void iio_trigger_notify_done(struct iio_trigger *trig) |
159 | { | |
a1a8e1dc LPC |
160 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
161 | trig->ops->try_reenable) | |
e69616b1 | 162 | if (trig->ops->try_reenable(trig)) |
860c9c54 | 163 | /* Missed an interrupt so launch new poll now */ |
398fd22b | 164 | iio_trigger_poll(trig); |
1637db44 JC |
165 | } |
166 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
167 | ||
1637db44 | 168 | /* Trigger Consumer related functions */ |
208b813c JC |
169 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
170 | { | |
171 | int ret; | |
172 | mutex_lock(&trig->pool_lock); | |
173 | ret = bitmap_find_free_region(trig->pool, | |
174 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
175 | ilog2(1)); | |
176 | mutex_unlock(&trig->pool_lock); | |
177 | if (ret >= 0) | |
178 | ret += trig->subirq_base; | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
183 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
184 | { | |
185 | mutex_lock(&trig->pool_lock); | |
186 | clear_bit(irq - trig->subirq_base, trig->pool); | |
187 | mutex_unlock(&trig->pool_lock); | |
188 | } | |
1637db44 JC |
189 | |
190 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
191 | * may be needed if the pollfuncs do not include the data read for the | |
192 | * triggering device. | |
193 | * This is not currently handled. Alternative of not enabling trigger unless | |
194 | * the relevant function is in there may be the best option. | |
195 | */ | |
860c9c54 | 196 | /* Worth protecting against double additions? */ |
208b813c JC |
197 | static int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
198 | struct iio_poll_func *pf) | |
1637db44 JC |
199 | { |
200 | int ret = 0; | |
51c060a0 JC |
201 | bool notinuse |
202 | = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
203 | ||
860c9c54 | 204 | /* Prevent the module from being removed whilst attached to a trigger */ |
f60c4a02 | 205 | __module_get(pf->indio_dev->info->driver_module); |
51c060a0 JC |
206 | pf->irq = iio_trigger_get_irq(trig); |
207 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, | |
208 | pf->type, pf->name, | |
209 | pf); | |
5dd72ecb JC |
210 | if (ret < 0) { |
211 | module_put(pf->indio_dev->info->driver_module); | |
212 | return ret; | |
213 | } | |
214 | ||
215 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { | |
d29f73db | 216 | ret = trig->ops->set_trigger_state(trig, true); |
5dd72ecb JC |
217 | if (ret < 0) |
218 | module_put(pf->indio_dev->info->driver_module); | |
219 | } | |
d96d1337 | 220 | |
1637db44 JC |
221 | return ret; |
222 | } | |
1637db44 | 223 | |
034bd7b5 | 224 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
208b813c | 225 | struct iio_poll_func *pf) |
1637db44 | 226 | { |
51c060a0 JC |
227 | int ret = 0; |
228 | bool no_other_users | |
229 | = (bitmap_weight(trig->pool, | |
230 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) | |
231 | == 1); | |
d29f73db JC |
232 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
233 | ret = trig->ops->set_trigger_state(trig, false); | |
51c060a0 | 234 | if (ret) |
92825ff9 | 235 | return ret; |
1637db44 | 236 | } |
51c060a0 JC |
237 | iio_trigger_put_irq(trig, pf->irq); |
238 | free_irq(pf->irq, pf); | |
f60c4a02 | 239 | module_put(pf->indio_dev->info->driver_module); |
1637db44 | 240 | |
1637db44 JC |
241 | return ret; |
242 | } | |
1637db44 | 243 | |
d96d1337 JC |
244 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
245 | { | |
246 | struct iio_poll_func *pf = p; | |
247 | pf->timestamp = iio_get_time_ns(); | |
248 | return IRQ_WAKE_THREAD; | |
249 | } | |
250 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
251 | ||
21b185f8 JC |
252 | struct iio_poll_func |
253 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
254 | irqreturn_t (*thread)(int irq, void *p), | |
255 | int type, | |
e65bc6ac | 256 | struct iio_dev *indio_dev, |
21b185f8 JC |
257 | const char *fmt, |
258 | ...) | |
259 | { | |
260 | va_list vargs; | |
261 | struct iio_poll_func *pf; | |
262 | ||
263 | pf = kmalloc(sizeof *pf, GFP_KERNEL); | |
264 | if (pf == NULL) | |
265 | return NULL; | |
266 | va_start(vargs, fmt); | |
267 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
268 | va_end(vargs); | |
269 | if (pf->name == NULL) { | |
270 | kfree(pf); | |
271 | return NULL; | |
272 | } | |
273 | pf->h = h; | |
274 | pf->thread = thread; | |
275 | pf->type = type; | |
e65bc6ac | 276 | pf->indio_dev = indio_dev; |
21b185f8 JC |
277 | |
278 | return pf; | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
281 | ||
282 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
283 | { | |
284 | kfree(pf->name); | |
285 | kfree(pf); | |
286 | } | |
287 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
288 | ||
1637db44 | 289 | /** |
860c9c54 | 290 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
1637db44 JC |
291 | * |
292 | * For trigger consumers the current_trigger interface allows the trigger | |
293 | * used by the device to be queried. | |
294 | **/ | |
295 | static ssize_t iio_trigger_read_current(struct device *dev, | |
296 | struct device_attribute *attr, | |
297 | char *buf) | |
298 | { | |
e53f5ac5 | 299 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 300 | |
f8c6f4e9 JC |
301 | if (indio_dev->trig) |
302 | return sprintf(buf, "%s\n", indio_dev->trig->name); | |
cb6c89a0 | 303 | return 0; |
1637db44 JC |
304 | } |
305 | ||
306 | /** | |
860c9c54 | 307 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
1637db44 JC |
308 | * |
309 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 310 | * used for this device to be specified at run time based on the trigger's |
1637db44 JC |
311 | * name. |
312 | **/ | |
313 | static ssize_t iio_trigger_write_current(struct device *dev, | |
314 | struct device_attribute *attr, | |
315 | const char *buf, | |
316 | size_t len) | |
317 | { | |
e53f5ac5 | 318 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 319 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
320 | struct iio_trigger *trig; |
321 | int ret; | |
322 | ||
f8c6f4e9 JC |
323 | mutex_lock(&indio_dev->mlock); |
324 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { | |
325 | mutex_unlock(&indio_dev->mlock); | |
1637db44 JC |
326 | return -EBUSY; |
327 | } | |
f8c6f4e9 | 328 | mutex_unlock(&indio_dev->mlock); |
1637db44 | 329 | |
43a4360e | 330 | trig = iio_trigger_find_by_name(buf, len); |
5dd72ecb JC |
331 | if (oldtrig == trig) |
332 | return len; | |
43a4360e | 333 | |
f8c6f4e9 JC |
334 | if (trig && indio_dev->info->validate_trigger) { |
335 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e MH |
336 | if (ret) |
337 | return ret; | |
338 | } | |
339 | ||
d29f73db | 340 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 341 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e MH |
342 | if (ret) |
343 | return ret; | |
344 | } | |
345 | ||
f8c6f4e9 | 346 | indio_dev->trig = trig; |
43a4360e | 347 | |
a35e1fd2 | 348 | if (oldtrig) |
7cbb7537 | 349 | iio_trigger_put(oldtrig); |
f8c6f4e9 | 350 | if (indio_dev->trig) |
7cbb7537 | 351 | iio_trigger_get(indio_dev->trig); |
1637db44 JC |
352 | |
353 | return len; | |
354 | } | |
355 | ||
74112d3f GKH |
356 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
357 | iio_trigger_read_current, | |
358 | iio_trigger_write_current); | |
1637db44 JC |
359 | |
360 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
361 | &dev_attr_current_trigger.attr, | |
362 | NULL, | |
363 | }; | |
364 | ||
365 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
366 | .name = "trigger", | |
367 | .attrs = iio_trigger_consumer_attrs, | |
368 | }; | |
369 | ||
370 | static void iio_trig_release(struct device *device) | |
371 | { | |
372 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
373 | int i; |
374 | ||
375 | if (trig->subirq_base) { | |
376 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
377 | irq_modify_status(trig->subirq_base + i, | |
378 | IRQ_NOAUTOEN, | |
379 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
380 | irq_set_chip(trig->subirq_base + i, | |
381 | NULL); | |
382 | irq_set_handler(trig->subirq_base + i, | |
383 | NULL); | |
384 | } | |
385 | ||
386 | irq_free_descs(trig->subirq_base, | |
387 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
388 | } | |
59c85e82 | 389 | kfree(trig->name); |
1637db44 | 390 | kfree(trig); |
1637db44 JC |
391 | } |
392 | ||
393 | static struct device_type iio_trig_type = { | |
394 | .release = iio_trig_release, | |
f59c2576 | 395 | .groups = iio_trig_dev_groups, |
1637db44 JC |
396 | }; |
397 | ||
d96d1337 JC |
398 | static void iio_trig_subirqmask(struct irq_data *d) |
399 | { | |
400 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
401 | struct iio_trigger *trig | |
402 | = container_of(chip, | |
403 | struct iio_trigger, subirq_chip); | |
404 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; | |
405 | } | |
406 | ||
407 | static void iio_trig_subirqunmask(struct irq_data *d) | |
408 | { | |
409 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
410 | struct iio_trigger *trig | |
411 | = container_of(chip, | |
412 | struct iio_trigger, subirq_chip); | |
413 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; | |
414 | } | |
415 | ||
d536321d | 416 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
1637db44 JC |
417 | { |
418 | struct iio_trigger *trig; | |
419 | trig = kzalloc(sizeof *trig, GFP_KERNEL); | |
420 | if (trig) { | |
d96d1337 | 421 | int i; |
1637db44 | 422 | trig->dev.type = &iio_trig_type; |
5aaaeba8 | 423 | trig->dev.bus = &iio_bus_type; |
1637db44 | 424 | device_initialize(&trig->dev); |
d96d1337 | 425 | |
59c85e82 JC |
426 | mutex_init(&trig->pool_lock); |
427 | trig->subirq_base | |
428 | = irq_alloc_descs(-1, 0, | |
429 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
430 | 0); | |
431 | if (trig->subirq_base < 0) { | |
432 | kfree(trig); | |
433 | return NULL; | |
434 | } | |
d536321d | 435 | |
59c85e82 | 436 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
59c85e82 JC |
437 | if (trig->name == NULL) { |
438 | irq_free_descs(trig->subirq_base, | |
439 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
440 | kfree(trig); | |
441 | return NULL; | |
442 | } | |
443 | trig->subirq_chip.name = trig->name; | |
444 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
445 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
446 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
447 | irq_set_chip(trig->subirq_base + i, | |
448 | &trig->subirq_chip); | |
449 | irq_set_handler(trig->subirq_base + i, | |
450 | &handle_simple_irq); | |
451 | irq_modify_status(trig->subirq_base + i, | |
452 | IRQ_NOREQUEST | IRQ_NOAUTOEN, | |
453 | IRQ_NOPROBE); | |
d96d1337 | 454 | } |
5f9c035c | 455 | get_device(&trig->dev); |
1637db44 | 456 | } |
d536321d JA |
457 | |
458 | return trig; | |
459 | } | |
460 | ||
461 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) | |
462 | { | |
463 | struct iio_trigger *trig; | |
464 | va_list vargs; | |
465 | ||
466 | va_start(vargs, fmt); | |
467 | trig = viio_trigger_alloc(fmt, vargs); | |
468 | va_end(vargs); | |
469 | ||
1637db44 JC |
470 | return trig; |
471 | } | |
7cbb7537 | 472 | EXPORT_SYMBOL(iio_trigger_alloc); |
1637db44 | 473 | |
7cbb7537 | 474 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
475 | { |
476 | if (trig) | |
477 | put_device(&trig->dev); | |
478 | } | |
7cbb7537 | 479 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 480 | |
d536321d JA |
481 | static void devm_iio_trigger_release(struct device *dev, void *res) |
482 | { | |
483 | iio_trigger_free(*(struct iio_trigger **)res); | |
484 | } | |
485 | ||
486 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) | |
487 | { | |
488 | struct iio_trigger **r = res; | |
489 | ||
490 | if (!r || !*r) { | |
491 | WARN_ON(!r || !*r); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | return *r == data; | |
496 | } | |
497 | ||
a7e57dce SK |
498 | /** |
499 | * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() | |
500 | * @dev: Device to allocate iio_trigger for | |
501 | * @fmt: trigger name format. If it includes format | |
502 | * specifiers, the additional arguments following | |
503 | * format are formatted and inserted in the resulting | |
504 | * string replacing their respective specifiers. | |
505 | * | |
506 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is | |
507 | * automatically freed on driver detach. | |
508 | * | |
509 | * If an iio_trigger allocated with this function needs to be freed separately, | |
510 | * devm_iio_trigger_free() must be used. | |
511 | * | |
512 | * RETURNS: | |
513 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
514 | */ | |
d536321d JA |
515 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
516 | const char *fmt, ...) | |
517 | { | |
518 | struct iio_trigger **ptr, *trig; | |
519 | va_list vargs; | |
520 | ||
521 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
522 | GFP_KERNEL); | |
523 | if (!ptr) | |
524 | return NULL; | |
525 | ||
526 | /* use raw alloc_dr for kmalloc caller tracing */ | |
527 | va_start(vargs, fmt); | |
528 | trig = viio_trigger_alloc(fmt, vargs); | |
529 | va_end(vargs); | |
530 | if (trig) { | |
531 | *ptr = trig; | |
532 | devres_add(dev, ptr); | |
533 | } else { | |
534 | devres_free(ptr); | |
535 | } | |
536 | ||
537 | return trig; | |
538 | } | |
539 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); | |
540 | ||
a7e57dce SK |
541 | /** |
542 | * devm_iio_trigger_free - Resource-managed iio_trigger_free() | |
543 | * @dev: Device this iio_dev belongs to | |
544 | * @iio_trig: the iio_trigger associated with the device | |
545 | * | |
546 | * Free iio_trigger allocated with devm_iio_trigger_alloc(). | |
547 | */ | |
d536321d JA |
548 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
549 | { | |
550 | int rc; | |
551 | ||
552 | rc = devres_release(dev, devm_iio_trigger_release, | |
553 | devm_iio_trigger_match, iio_trig); | |
554 | WARN_ON(rc); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); | |
557 | ||
67be8e32 | 558 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 559 | { |
f8c6f4e9 | 560 | indio_dev->groups[indio_dev->groupcounter++] = |
26d25ae3 | 561 | &iio_trigger_consumer_attr_group; |
1637db44 | 562 | } |
1637db44 | 563 | |
f8c6f4e9 | 564 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 565 | { |
860c9c54 | 566 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 567 | if (indio_dev->trig) |
7cbb7537 | 568 | iio_trigger_put(indio_dev->trig); |
1637db44 | 569 | } |
1637db44 | 570 | |
3b99fb76 | 571 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
c3db00cc | 572 | { |
67be8e32 JC |
573 | return iio_trigger_attach_poll_func(indio_dev->trig, |
574 | indio_dev->pollfunc); | |
c3db00cc | 575 | } |
3b99fb76 | 576 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
c3db00cc | 577 | |
3b99fb76 | 578 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
c3db00cc | 579 | { |
034bd7b5 | 580 | return iio_trigger_detach_poll_func(indio_dev->trig, |
67be8e32 | 581 | indio_dev->pollfunc); |
c3db00cc | 582 | } |
3b99fb76 | 583 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |