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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 | }; | |
1637db44 | 58 | |
6d459aa0 LPC |
59 | static struct attribute_group iio_trig_attr_group = { |
60 | .attrs = iio_trig_dev_attrs, | |
61 | }; | |
62 | ||
63 | static const struct attribute_group *iio_trig_attr_groups[] = { | |
64 | &iio_trig_attr_group, | |
65 | NULL | |
66 | }; | |
1637db44 | 67 | |
1637db44 JC |
68 | int iio_trigger_register(struct iio_trigger *trig_info) |
69 | { | |
70 | int ret; | |
71 | ||
47c24fdd JC |
72 | trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL); |
73 | if (trig_info->id < 0) { | |
74 | ret = trig_info->id; | |
1637db44 | 75 | goto error_ret; |
47c24fdd | 76 | } |
1637db44 JC |
77 | /* Set the name used for the sysfs directory etc */ |
78 | dev_set_name(&trig_info->dev, "trigger%ld", | |
79 | (unsigned long) trig_info->id); | |
80 | ||
81 | ret = device_add(&trig_info->dev); | |
82 | if (ret) | |
83 | goto error_unregister_id; | |
84 | ||
1637db44 JC |
85 | /* Add to list of available triggers held by the IIO core */ |
86 | mutex_lock(&iio_trigger_list_lock); | |
87 | list_add_tail(&trig_info->list, &iio_trigger_list); | |
88 | mutex_unlock(&iio_trigger_list_lock); | |
89 | ||
90 | return 0; | |
91 | ||
1637db44 | 92 | error_unregister_id: |
47c24fdd | 93 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 JC |
94 | error_ret: |
95 | return ret; | |
96 | } | |
97 | EXPORT_SYMBOL(iio_trigger_register); | |
98 | ||
99 | void iio_trigger_unregister(struct iio_trigger *trig_info) | |
100 | { | |
1637db44 | 101 | mutex_lock(&iio_trigger_list_lock); |
582e5489 | 102 | list_del(&trig_info->list); |
1637db44 JC |
103 | mutex_unlock(&iio_trigger_list_lock); |
104 | ||
47c24fdd | 105 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 | 106 | /* Possible issue in here */ |
8bade406 | 107 | device_del(&trig_info->dev); |
1637db44 JC |
108 | } |
109 | EXPORT_SYMBOL(iio_trigger_unregister); | |
110 | ||
f6517f22 JC |
111 | static struct iio_trigger *iio_trigger_find_by_name(const char *name, |
112 | size_t len) | |
1637db44 | 113 | { |
f6517f22 | 114 | struct iio_trigger *trig = NULL, *iter; |
7c327857 | 115 | |
1637db44 | 116 | mutex_lock(&iio_trigger_list_lock); |
f6517f22 JC |
117 | list_for_each_entry(iter, &iio_trigger_list, list) |
118 | if (sysfs_streq(iter->name, name)) { | |
119 | trig = iter; | |
1637db44 JC |
120 | break; |
121 | } | |
1637db44 JC |
122 | mutex_unlock(&iio_trigger_list_lock); |
123 | ||
f6517f22 | 124 | return trig; |
5f87404d | 125 | } |
1637db44 | 126 | |
7b2c33b1 | 127 | void iio_trigger_poll(struct iio_trigger *trig, s64 time) |
1637db44 | 128 | { |
d96d1337 | 129 | int i; |
a1a8e1dc LPC |
130 | |
131 | if (!atomic_read(&trig->use_count)) { | |
132 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
133 | ||
134 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
135 | if (trig->subirqs[i].enabled) | |
d96d1337 | 136 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
137 | else |
138 | iio_trigger_notify_done(trig); | |
139 | } | |
140 | } | |
1637db44 JC |
141 | } |
142 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
143 | |
144 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
145 | { | |
146 | iio_trigger_poll(private, iio_get_time_ns()); | |
147 | return IRQ_HANDLED; | |
148 | } | |
149 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 150 | |
1f785681 JC |
151 | void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time) |
152 | { | |
153 | int i; | |
a1a8e1dc LPC |
154 | |
155 | if (!atomic_read(&trig->use_count)) { | |
156 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
157 | ||
158 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
159 | if (trig->subirqs[i].enabled) | |
1f785681 | 160 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
161 | else |
162 | iio_trigger_notify_done(trig); | |
163 | } | |
164 | } | |
1f785681 JC |
165 | } |
166 | EXPORT_SYMBOL(iio_trigger_poll_chained); | |
167 | ||
1637db44 JC |
168 | void iio_trigger_notify_done(struct iio_trigger *trig) |
169 | { | |
a1a8e1dc LPC |
170 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
171 | trig->ops->try_reenable) | |
e69616b1 | 172 | if (trig->ops->try_reenable(trig)) |
860c9c54 | 173 | /* Missed an interrupt so launch new poll now */ |
7b2c33b1 | 174 | iio_trigger_poll(trig, 0); |
1637db44 JC |
175 | } |
176 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
177 | ||
1637db44 | 178 | /* Trigger Consumer related functions */ |
208b813c JC |
179 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
180 | { | |
181 | int ret; | |
182 | mutex_lock(&trig->pool_lock); | |
183 | ret = bitmap_find_free_region(trig->pool, | |
184 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
185 | ilog2(1)); | |
186 | mutex_unlock(&trig->pool_lock); | |
187 | if (ret >= 0) | |
188 | ret += trig->subirq_base; | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
194 | { | |
195 | mutex_lock(&trig->pool_lock); | |
196 | clear_bit(irq - trig->subirq_base, trig->pool); | |
197 | mutex_unlock(&trig->pool_lock); | |
198 | } | |
1637db44 JC |
199 | |
200 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
201 | * may be needed if the pollfuncs do not include the data read for the | |
202 | * triggering device. | |
203 | * This is not currently handled. Alternative of not enabling trigger unless | |
204 | * the relevant function is in there may be the best option. | |
205 | */ | |
860c9c54 | 206 | /* Worth protecting against double additions? */ |
208b813c JC |
207 | static int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
208 | struct iio_poll_func *pf) | |
1637db44 JC |
209 | { |
210 | int ret = 0; | |
51c060a0 JC |
211 | bool notinuse |
212 | = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
213 | ||
860c9c54 | 214 | /* Prevent the module from being removed whilst attached to a trigger */ |
f60c4a02 | 215 | __module_get(pf->indio_dev->info->driver_module); |
51c060a0 JC |
216 | pf->irq = iio_trigger_get_irq(trig); |
217 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, | |
218 | pf->type, pf->name, | |
219 | pf); | |
5dd72ecb JC |
220 | if (ret < 0) { |
221 | module_put(pf->indio_dev->info->driver_module); | |
222 | return ret; | |
223 | } | |
224 | ||
225 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { | |
d29f73db | 226 | ret = trig->ops->set_trigger_state(trig, true); |
5dd72ecb JC |
227 | if (ret < 0) |
228 | module_put(pf->indio_dev->info->driver_module); | |
229 | } | |
d96d1337 | 230 | |
1637db44 JC |
231 | return ret; |
232 | } | |
1637db44 | 233 | |
034bd7b5 | 234 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
208b813c | 235 | struct iio_poll_func *pf) |
1637db44 | 236 | { |
51c060a0 JC |
237 | int ret = 0; |
238 | bool no_other_users | |
239 | = (bitmap_weight(trig->pool, | |
240 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) | |
241 | == 1); | |
d29f73db JC |
242 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
243 | ret = trig->ops->set_trigger_state(trig, false); | |
51c060a0 JC |
244 | if (ret) |
245 | goto error_ret; | |
1637db44 | 246 | } |
51c060a0 JC |
247 | iio_trigger_put_irq(trig, pf->irq); |
248 | free_irq(pf->irq, pf); | |
f60c4a02 | 249 | module_put(pf->indio_dev->info->driver_module); |
1637db44 JC |
250 | |
251 | error_ret: | |
252 | return ret; | |
253 | } | |
1637db44 | 254 | |
d96d1337 JC |
255 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
256 | { | |
257 | struct iio_poll_func *pf = p; | |
258 | pf->timestamp = iio_get_time_ns(); | |
259 | return IRQ_WAKE_THREAD; | |
260 | } | |
261 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
262 | ||
21b185f8 JC |
263 | struct iio_poll_func |
264 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
265 | irqreturn_t (*thread)(int irq, void *p), | |
266 | int type, | |
e65bc6ac | 267 | struct iio_dev *indio_dev, |
21b185f8 JC |
268 | const char *fmt, |
269 | ...) | |
270 | { | |
271 | va_list vargs; | |
272 | struct iio_poll_func *pf; | |
273 | ||
274 | pf = kmalloc(sizeof *pf, GFP_KERNEL); | |
275 | if (pf == NULL) | |
276 | return NULL; | |
277 | va_start(vargs, fmt); | |
278 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
279 | va_end(vargs); | |
280 | if (pf->name == NULL) { | |
281 | kfree(pf); | |
282 | return NULL; | |
283 | } | |
284 | pf->h = h; | |
285 | pf->thread = thread; | |
286 | pf->type = type; | |
e65bc6ac | 287 | pf->indio_dev = indio_dev; |
21b185f8 JC |
288 | |
289 | return pf; | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
292 | ||
293 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
294 | { | |
295 | kfree(pf->name); | |
296 | kfree(pf); | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
299 | ||
1637db44 | 300 | /** |
860c9c54 | 301 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
1637db44 JC |
302 | * |
303 | * For trigger consumers the current_trigger interface allows the trigger | |
304 | * used by the device to be queried. | |
305 | **/ | |
306 | static ssize_t iio_trigger_read_current(struct device *dev, | |
307 | struct device_attribute *attr, | |
308 | char *buf) | |
309 | { | |
e53f5ac5 | 310 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 311 | |
f8c6f4e9 JC |
312 | if (indio_dev->trig) |
313 | return sprintf(buf, "%s\n", indio_dev->trig->name); | |
cb6c89a0 | 314 | return 0; |
1637db44 JC |
315 | } |
316 | ||
317 | /** | |
860c9c54 | 318 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
1637db44 JC |
319 | * |
320 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 321 | * used for this device to be specified at run time based on the trigger's |
1637db44 JC |
322 | * name. |
323 | **/ | |
324 | static ssize_t iio_trigger_write_current(struct device *dev, | |
325 | struct device_attribute *attr, | |
326 | const char *buf, | |
327 | size_t len) | |
328 | { | |
e53f5ac5 | 329 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 330 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
331 | struct iio_trigger *trig; |
332 | int ret; | |
333 | ||
f8c6f4e9 JC |
334 | mutex_lock(&indio_dev->mlock); |
335 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { | |
336 | mutex_unlock(&indio_dev->mlock); | |
1637db44 JC |
337 | return -EBUSY; |
338 | } | |
f8c6f4e9 | 339 | mutex_unlock(&indio_dev->mlock); |
1637db44 | 340 | |
43a4360e | 341 | trig = iio_trigger_find_by_name(buf, len); |
5dd72ecb JC |
342 | if (oldtrig == trig) |
343 | return len; | |
43a4360e | 344 | |
f8c6f4e9 JC |
345 | if (trig && indio_dev->info->validate_trigger) { |
346 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e MH |
347 | if (ret) |
348 | return ret; | |
349 | } | |
350 | ||
d29f73db | 351 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 352 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e MH |
353 | if (ret) |
354 | return ret; | |
355 | } | |
356 | ||
f8c6f4e9 | 357 | indio_dev->trig = trig; |
43a4360e | 358 | |
a35e1fd2 | 359 | if (oldtrig) |
7cbb7537 | 360 | iio_trigger_put(oldtrig); |
f8c6f4e9 | 361 | if (indio_dev->trig) |
7cbb7537 | 362 | iio_trigger_get(indio_dev->trig); |
1637db44 JC |
363 | |
364 | return len; | |
365 | } | |
366 | ||
74112d3f GKH |
367 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
368 | iio_trigger_read_current, | |
369 | iio_trigger_write_current); | |
1637db44 JC |
370 | |
371 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
372 | &dev_attr_current_trigger.attr, | |
373 | NULL, | |
374 | }; | |
375 | ||
376 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
377 | .name = "trigger", | |
378 | .attrs = iio_trigger_consumer_attrs, | |
379 | }; | |
380 | ||
381 | static void iio_trig_release(struct device *device) | |
382 | { | |
383 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
384 | int i; |
385 | ||
386 | if (trig->subirq_base) { | |
387 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
388 | irq_modify_status(trig->subirq_base + i, | |
389 | IRQ_NOAUTOEN, | |
390 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
391 | irq_set_chip(trig->subirq_base + i, | |
392 | NULL); | |
393 | irq_set_handler(trig->subirq_base + i, | |
394 | NULL); | |
395 | } | |
396 | ||
397 | irq_free_descs(trig->subirq_base, | |
398 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
399 | } | |
59c85e82 | 400 | kfree(trig->name); |
1637db44 | 401 | kfree(trig); |
1637db44 JC |
402 | } |
403 | ||
404 | static struct device_type iio_trig_type = { | |
405 | .release = iio_trig_release, | |
6d459aa0 | 406 | .groups = iio_trig_attr_groups, |
1637db44 JC |
407 | }; |
408 | ||
d96d1337 JC |
409 | static void iio_trig_subirqmask(struct irq_data *d) |
410 | { | |
411 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
412 | struct iio_trigger *trig | |
413 | = container_of(chip, | |
414 | struct iio_trigger, subirq_chip); | |
415 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; | |
416 | } | |
417 | ||
418 | static void iio_trig_subirqunmask(struct irq_data *d) | |
419 | { | |
420 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
421 | struct iio_trigger *trig | |
422 | = container_of(chip, | |
423 | struct iio_trigger, subirq_chip); | |
424 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; | |
425 | } | |
426 | ||
d536321d | 427 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
1637db44 JC |
428 | { |
429 | struct iio_trigger *trig; | |
430 | trig = kzalloc(sizeof *trig, GFP_KERNEL); | |
431 | if (trig) { | |
d96d1337 | 432 | int i; |
1637db44 | 433 | trig->dev.type = &iio_trig_type; |
5aaaeba8 | 434 | trig->dev.bus = &iio_bus_type; |
1637db44 | 435 | device_initialize(&trig->dev); |
d96d1337 | 436 | |
59c85e82 JC |
437 | mutex_init(&trig->pool_lock); |
438 | trig->subirq_base | |
439 | = irq_alloc_descs(-1, 0, | |
440 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
441 | 0); | |
442 | if (trig->subirq_base < 0) { | |
443 | kfree(trig); | |
444 | return NULL; | |
445 | } | |
d536321d | 446 | |
59c85e82 | 447 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
59c85e82 JC |
448 | if (trig->name == NULL) { |
449 | irq_free_descs(trig->subirq_base, | |
450 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
451 | kfree(trig); | |
452 | return NULL; | |
453 | } | |
454 | trig->subirq_chip.name = trig->name; | |
455 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
456 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
457 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
458 | irq_set_chip(trig->subirq_base + i, | |
459 | &trig->subirq_chip); | |
460 | irq_set_handler(trig->subirq_base + i, | |
461 | &handle_simple_irq); | |
462 | irq_modify_status(trig->subirq_base + i, | |
463 | IRQ_NOREQUEST | IRQ_NOAUTOEN, | |
464 | IRQ_NOPROBE); | |
d96d1337 | 465 | } |
5f9c035c | 466 | get_device(&trig->dev); |
1637db44 | 467 | } |
d536321d JA |
468 | |
469 | return trig; | |
470 | } | |
471 | ||
472 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) | |
473 | { | |
474 | struct iio_trigger *trig; | |
475 | va_list vargs; | |
476 | ||
477 | va_start(vargs, fmt); | |
478 | trig = viio_trigger_alloc(fmt, vargs); | |
479 | va_end(vargs); | |
480 | ||
1637db44 JC |
481 | return trig; |
482 | } | |
7cbb7537 | 483 | EXPORT_SYMBOL(iio_trigger_alloc); |
1637db44 | 484 | |
7cbb7537 | 485 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
486 | { |
487 | if (trig) | |
488 | put_device(&trig->dev); | |
489 | } | |
7cbb7537 | 490 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 491 | |
d536321d JA |
492 | static void devm_iio_trigger_release(struct device *dev, void *res) |
493 | { | |
494 | iio_trigger_free(*(struct iio_trigger **)res); | |
495 | } | |
496 | ||
497 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) | |
498 | { | |
499 | struct iio_trigger **r = res; | |
500 | ||
501 | if (!r || !*r) { | |
502 | WARN_ON(!r || !*r); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | return *r == data; | |
507 | } | |
508 | ||
a7e57dce SK |
509 | /** |
510 | * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() | |
511 | * @dev: Device to allocate iio_trigger for | |
512 | * @fmt: trigger name format. If it includes format | |
513 | * specifiers, the additional arguments following | |
514 | * format are formatted and inserted in the resulting | |
515 | * string replacing their respective specifiers. | |
516 | * | |
517 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is | |
518 | * automatically freed on driver detach. | |
519 | * | |
520 | * If an iio_trigger allocated with this function needs to be freed separately, | |
521 | * devm_iio_trigger_free() must be used. | |
522 | * | |
523 | * RETURNS: | |
524 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
525 | */ | |
d536321d JA |
526 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
527 | const char *fmt, ...) | |
528 | { | |
529 | struct iio_trigger **ptr, *trig; | |
530 | va_list vargs; | |
531 | ||
532 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
533 | GFP_KERNEL); | |
534 | if (!ptr) | |
535 | return NULL; | |
536 | ||
537 | /* use raw alloc_dr for kmalloc caller tracing */ | |
538 | va_start(vargs, fmt); | |
539 | trig = viio_trigger_alloc(fmt, vargs); | |
540 | va_end(vargs); | |
541 | if (trig) { | |
542 | *ptr = trig; | |
543 | devres_add(dev, ptr); | |
544 | } else { | |
545 | devres_free(ptr); | |
546 | } | |
547 | ||
548 | return trig; | |
549 | } | |
550 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); | |
551 | ||
a7e57dce SK |
552 | /** |
553 | * devm_iio_trigger_free - Resource-managed iio_trigger_free() | |
554 | * @dev: Device this iio_dev belongs to | |
555 | * @iio_trig: the iio_trigger associated with the device | |
556 | * | |
557 | * Free iio_trigger allocated with devm_iio_trigger_alloc(). | |
558 | */ | |
d536321d JA |
559 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
560 | { | |
561 | int rc; | |
562 | ||
563 | rc = devres_release(dev, devm_iio_trigger_release, | |
564 | devm_iio_trigger_match, iio_trig); | |
565 | WARN_ON(rc); | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); | |
568 | ||
67be8e32 | 569 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 570 | { |
f8c6f4e9 | 571 | indio_dev->groups[indio_dev->groupcounter++] = |
26d25ae3 | 572 | &iio_trigger_consumer_attr_group; |
1637db44 | 573 | } |
1637db44 | 574 | |
f8c6f4e9 | 575 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 576 | { |
860c9c54 | 577 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 578 | if (indio_dev->trig) |
7cbb7537 | 579 | iio_trigger_put(indio_dev->trig); |
1637db44 | 580 | } |
1637db44 | 581 | |
3b99fb76 | 582 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
c3db00cc | 583 | { |
67be8e32 JC |
584 | return iio_trigger_attach_poll_func(indio_dev->trig, |
585 | indio_dev->pollfunc); | |
c3db00cc | 586 | } |
3b99fb76 | 587 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
c3db00cc | 588 | |
3b99fb76 | 589 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
c3db00cc | 590 | { |
034bd7b5 | 591 | return iio_trigger_detach_poll_func(indio_dev->trig, |
67be8e32 | 592 | indio_dev->pollfunc); |
c3db00cc | 593 | } |
3b99fb76 | 594 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |