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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 | |
8e563b0d CO |
43 | * @dev: device associated with the iio_trigger |
44 | * @attr: pointer to the device_attribute structure that is | |
45 | * being processed | |
46 | * @buf: buffer to print the name into | |
47 | * | |
48 | * Return: a negative number on failure or the number of written | |
49 | * characters on success. | |
50 | */ | |
59c85e82 JC |
51 | static ssize_t iio_trigger_read_name(struct device *dev, |
52 | struct device_attribute *attr, | |
53 | char *buf) | |
54 | { | |
971ff1db | 55 | struct iio_trigger *trig = to_iio_trigger(dev); |
59c85e82 JC |
56 | return sprintf(buf, "%s\n", trig->name); |
57 | } | |
58 | ||
59 | static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL); | |
60 | ||
6d459aa0 LPC |
61 | static struct attribute *iio_trig_dev_attrs[] = { |
62 | &dev_attr_name.attr, | |
63 | NULL, | |
64 | }; | |
f59c2576 | 65 | ATTRIBUTE_GROUPS(iio_trig_dev); |
1637db44 | 66 | |
1637db44 JC |
67 | int iio_trigger_register(struct iio_trigger *trig_info) |
68 | { | |
69 | int ret; | |
70 | ||
47c24fdd | 71 | trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL); |
92825ff9 HK |
72 | if (trig_info->id < 0) |
73 | return trig_info->id; | |
74 | ||
1637db44 JC |
75 | /* Set the name used for the sysfs directory etc */ |
76 | dev_set_name(&trig_info->dev, "trigger%ld", | |
77 | (unsigned long) trig_info->id); | |
78 | ||
79 | ret = device_add(&trig_info->dev); | |
80 | if (ret) | |
81 | goto error_unregister_id; | |
82 | ||
1637db44 JC |
83 | /* Add to list of available triggers held by the IIO core */ |
84 | mutex_lock(&iio_trigger_list_lock); | |
85 | list_add_tail(&trig_info->list, &iio_trigger_list); | |
86 | mutex_unlock(&iio_trigger_list_lock); | |
87 | ||
88 | return 0; | |
89 | ||
1637db44 | 90 | error_unregister_id: |
47c24fdd | 91 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 JC |
92 | return ret; |
93 | } | |
94 | EXPORT_SYMBOL(iio_trigger_register); | |
95 | ||
96 | void iio_trigger_unregister(struct iio_trigger *trig_info) | |
97 | { | |
1637db44 | 98 | mutex_lock(&iio_trigger_list_lock); |
582e5489 | 99 | list_del(&trig_info->list); |
1637db44 JC |
100 | mutex_unlock(&iio_trigger_list_lock); |
101 | ||
47c24fdd | 102 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 | 103 | /* Possible issue in here */ |
8bade406 | 104 | device_del(&trig_info->dev); |
1637db44 JC |
105 | } |
106 | EXPORT_SYMBOL(iio_trigger_unregister); | |
107 | ||
f6517f22 JC |
108 | static struct iio_trigger *iio_trigger_find_by_name(const char *name, |
109 | size_t len) | |
1637db44 | 110 | { |
f6517f22 | 111 | struct iio_trigger *trig = NULL, *iter; |
7c327857 | 112 | |
1637db44 | 113 | mutex_lock(&iio_trigger_list_lock); |
f6517f22 JC |
114 | list_for_each_entry(iter, &iio_trigger_list, list) |
115 | if (sysfs_streq(iter->name, name)) { | |
116 | trig = iter; | |
1637db44 JC |
117 | break; |
118 | } | |
1637db44 JC |
119 | mutex_unlock(&iio_trigger_list_lock); |
120 | ||
f6517f22 | 121 | return trig; |
5f87404d | 122 | } |
1637db44 | 123 | |
398fd22b | 124 | void iio_trigger_poll(struct iio_trigger *trig) |
1637db44 | 125 | { |
d96d1337 | 126 | int i; |
a1a8e1dc LPC |
127 | |
128 | if (!atomic_read(&trig->use_count)) { | |
129 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
130 | ||
131 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
132 | if (trig->subirqs[i].enabled) | |
d96d1337 | 133 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
134 | else |
135 | iio_trigger_notify_done(trig); | |
136 | } | |
137 | } | |
1637db44 JC |
138 | } |
139 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
140 | |
141 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
142 | { | |
398fd22b | 143 | iio_trigger_poll(private); |
8384d957 JC |
144 | return IRQ_HANDLED; |
145 | } | |
146 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 147 | |
398fd22b | 148 | void iio_trigger_poll_chained(struct iio_trigger *trig) |
1f785681 JC |
149 | { |
150 | int i; | |
a1a8e1dc LPC |
151 | |
152 | if (!atomic_read(&trig->use_count)) { | |
153 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
154 | ||
155 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
156 | if (trig->subirqs[i].enabled) | |
1f785681 | 157 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
158 | else |
159 | iio_trigger_notify_done(trig); | |
160 | } | |
161 | } | |
1f785681 JC |
162 | } |
163 | EXPORT_SYMBOL(iio_trigger_poll_chained); | |
164 | ||
1637db44 JC |
165 | void iio_trigger_notify_done(struct iio_trigger *trig) |
166 | { | |
a1a8e1dc LPC |
167 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
168 | trig->ops->try_reenable) | |
e69616b1 | 169 | if (trig->ops->try_reenable(trig)) |
860c9c54 | 170 | /* Missed an interrupt so launch new poll now */ |
398fd22b | 171 | iio_trigger_poll(trig); |
1637db44 JC |
172 | } |
173 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
174 | ||
1637db44 | 175 | /* Trigger Consumer related functions */ |
208b813c JC |
176 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
177 | { | |
178 | int ret; | |
179 | mutex_lock(&trig->pool_lock); | |
180 | ret = bitmap_find_free_region(trig->pool, | |
181 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
182 | ilog2(1)); | |
183 | mutex_unlock(&trig->pool_lock); | |
184 | if (ret >= 0) | |
185 | ret += trig->subirq_base; | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
190 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
191 | { | |
192 | mutex_lock(&trig->pool_lock); | |
193 | clear_bit(irq - trig->subirq_base, trig->pool); | |
194 | mutex_unlock(&trig->pool_lock); | |
195 | } | |
1637db44 JC |
196 | |
197 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
198 | * may be needed if the pollfuncs do not include the data read for the | |
199 | * triggering device. | |
200 | * This is not currently handled. Alternative of not enabling trigger unless | |
201 | * the relevant function is in there may be the best option. | |
202 | */ | |
860c9c54 | 203 | /* Worth protecting against double additions? */ |
208b813c JC |
204 | static int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
205 | struct iio_poll_func *pf) | |
1637db44 JC |
206 | { |
207 | int ret = 0; | |
51c060a0 JC |
208 | bool notinuse |
209 | = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
210 | ||
860c9c54 | 211 | /* Prevent the module from being removed whilst attached to a trigger */ |
f60c4a02 | 212 | __module_get(pf->indio_dev->info->driver_module); |
51c060a0 JC |
213 | pf->irq = iio_trigger_get_irq(trig); |
214 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, | |
215 | pf->type, pf->name, | |
216 | pf); | |
5dd72ecb JC |
217 | if (ret < 0) { |
218 | module_put(pf->indio_dev->info->driver_module); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { | |
d29f73db | 223 | ret = trig->ops->set_trigger_state(trig, true); |
5dd72ecb JC |
224 | if (ret < 0) |
225 | module_put(pf->indio_dev->info->driver_module); | |
226 | } | |
d96d1337 | 227 | |
1637db44 JC |
228 | return ret; |
229 | } | |
1637db44 | 230 | |
034bd7b5 | 231 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
208b813c | 232 | struct iio_poll_func *pf) |
1637db44 | 233 | { |
51c060a0 JC |
234 | int ret = 0; |
235 | bool no_other_users | |
236 | = (bitmap_weight(trig->pool, | |
237 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) | |
238 | == 1); | |
d29f73db JC |
239 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
240 | ret = trig->ops->set_trigger_state(trig, false); | |
51c060a0 | 241 | if (ret) |
92825ff9 | 242 | return ret; |
1637db44 | 243 | } |
51c060a0 JC |
244 | iio_trigger_put_irq(trig, pf->irq); |
245 | free_irq(pf->irq, pf); | |
f60c4a02 | 246 | module_put(pf->indio_dev->info->driver_module); |
1637db44 | 247 | |
1637db44 JC |
248 | return ret; |
249 | } | |
1637db44 | 250 | |
d96d1337 JC |
251 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
252 | { | |
253 | struct iio_poll_func *pf = p; | |
254 | pf->timestamp = iio_get_time_ns(); | |
255 | return IRQ_WAKE_THREAD; | |
256 | } | |
257 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
258 | ||
21b185f8 JC |
259 | struct iio_poll_func |
260 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
261 | irqreturn_t (*thread)(int irq, void *p), | |
262 | int type, | |
e65bc6ac | 263 | struct iio_dev *indio_dev, |
21b185f8 JC |
264 | const char *fmt, |
265 | ...) | |
266 | { | |
267 | va_list vargs; | |
268 | struct iio_poll_func *pf; | |
269 | ||
270 | pf = kmalloc(sizeof *pf, GFP_KERNEL); | |
271 | if (pf == NULL) | |
272 | return NULL; | |
273 | va_start(vargs, fmt); | |
274 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
275 | va_end(vargs); | |
276 | if (pf->name == NULL) { | |
277 | kfree(pf); | |
278 | return NULL; | |
279 | } | |
280 | pf->h = h; | |
281 | pf->thread = thread; | |
282 | pf->type = type; | |
e65bc6ac | 283 | pf->indio_dev = indio_dev; |
21b185f8 JC |
284 | |
285 | return pf; | |
286 | } | |
287 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
288 | ||
289 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
290 | { | |
291 | kfree(pf->name); | |
292 | kfree(pf); | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
295 | ||
1637db44 | 296 | /** |
860c9c54 | 297 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
8e563b0d CO |
298 | * @dev: device associated with an industrial I/O device |
299 | * @attr: pointer to the device_attribute structure that | |
300 | * is being processed | |
301 | * @buf: buffer where the current trigger name will be printed into | |
1637db44 JC |
302 | * |
303 | * For trigger consumers the current_trigger interface allows the trigger | |
304 | * used by the device to be queried. | |
8e563b0d CO |
305 | * |
306 | * Return: a negative number on failure, the number of characters written | |
307 | * on success or 0 if no trigger is available | |
308 | */ | |
1637db44 JC |
309 | static ssize_t iio_trigger_read_current(struct device *dev, |
310 | struct device_attribute *attr, | |
311 | char *buf) | |
312 | { | |
e53f5ac5 | 313 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 314 | |
f8c6f4e9 JC |
315 | if (indio_dev->trig) |
316 | return sprintf(buf, "%s\n", indio_dev->trig->name); | |
cb6c89a0 | 317 | return 0; |
1637db44 JC |
318 | } |
319 | ||
320 | /** | |
860c9c54 | 321 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
8e563b0d CO |
322 | * @dev: device associated with an industrial I/O device |
323 | * @attr: device attribute that is being processed | |
324 | * @buf: string buffer that holds the name of the trigger | |
325 | * @len: length of the trigger name held by buf | |
1637db44 JC |
326 | * |
327 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 328 | * used for this device to be specified at run time based on the trigger's |
1637db44 | 329 | * name. |
8e563b0d CO |
330 | * |
331 | * Return: negative error code on failure or length of the buffer | |
332 | * on success | |
333 | */ | |
1637db44 JC |
334 | static ssize_t iio_trigger_write_current(struct device *dev, |
335 | struct device_attribute *attr, | |
336 | const char *buf, | |
337 | size_t len) | |
338 | { | |
e53f5ac5 | 339 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 340 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
341 | struct iio_trigger *trig; |
342 | int ret; | |
343 | ||
f8c6f4e9 JC |
344 | mutex_lock(&indio_dev->mlock); |
345 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { | |
346 | mutex_unlock(&indio_dev->mlock); | |
1637db44 JC |
347 | return -EBUSY; |
348 | } | |
f8c6f4e9 | 349 | mutex_unlock(&indio_dev->mlock); |
1637db44 | 350 | |
43a4360e | 351 | trig = iio_trigger_find_by_name(buf, len); |
5dd72ecb JC |
352 | if (oldtrig == trig) |
353 | return len; | |
43a4360e | 354 | |
f8c6f4e9 JC |
355 | if (trig && indio_dev->info->validate_trigger) { |
356 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e MH |
357 | if (ret) |
358 | return ret; | |
359 | } | |
360 | ||
d29f73db | 361 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 362 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e MH |
363 | if (ret) |
364 | return ret; | |
365 | } | |
366 | ||
f8c6f4e9 | 367 | indio_dev->trig = trig; |
43a4360e | 368 | |
a35e1fd2 | 369 | if (oldtrig) |
7cbb7537 | 370 | iio_trigger_put(oldtrig); |
f8c6f4e9 | 371 | if (indio_dev->trig) |
7cbb7537 | 372 | iio_trigger_get(indio_dev->trig); |
1637db44 JC |
373 | |
374 | return len; | |
375 | } | |
376 | ||
74112d3f GKH |
377 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
378 | iio_trigger_read_current, | |
379 | iio_trigger_write_current); | |
1637db44 JC |
380 | |
381 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
382 | &dev_attr_current_trigger.attr, | |
383 | NULL, | |
384 | }; | |
385 | ||
386 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
387 | .name = "trigger", | |
388 | .attrs = iio_trigger_consumer_attrs, | |
389 | }; | |
390 | ||
391 | static void iio_trig_release(struct device *device) | |
392 | { | |
393 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
394 | int i; |
395 | ||
396 | if (trig->subirq_base) { | |
397 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
398 | irq_modify_status(trig->subirq_base + i, | |
399 | IRQ_NOAUTOEN, | |
400 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
401 | irq_set_chip(trig->subirq_base + i, | |
402 | NULL); | |
403 | irq_set_handler(trig->subirq_base + i, | |
404 | NULL); | |
405 | } | |
406 | ||
407 | irq_free_descs(trig->subirq_base, | |
408 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
409 | } | |
59c85e82 | 410 | kfree(trig->name); |
1637db44 | 411 | kfree(trig); |
1637db44 JC |
412 | } |
413 | ||
414 | static struct device_type iio_trig_type = { | |
415 | .release = iio_trig_release, | |
f59c2576 | 416 | .groups = iio_trig_dev_groups, |
1637db44 JC |
417 | }; |
418 | ||
d96d1337 JC |
419 | static void iio_trig_subirqmask(struct irq_data *d) |
420 | { | |
421 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
422 | struct iio_trigger *trig | |
423 | = container_of(chip, | |
424 | struct iio_trigger, subirq_chip); | |
425 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; | |
426 | } | |
427 | ||
428 | static void iio_trig_subirqunmask(struct irq_data *d) | |
429 | { | |
430 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
431 | struct iio_trigger *trig | |
432 | = container_of(chip, | |
433 | struct iio_trigger, subirq_chip); | |
434 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; | |
435 | } | |
436 | ||
d536321d | 437 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
1637db44 JC |
438 | { |
439 | struct iio_trigger *trig; | |
440 | trig = kzalloc(sizeof *trig, GFP_KERNEL); | |
441 | if (trig) { | |
d96d1337 | 442 | int i; |
1637db44 | 443 | trig->dev.type = &iio_trig_type; |
5aaaeba8 | 444 | trig->dev.bus = &iio_bus_type; |
1637db44 | 445 | device_initialize(&trig->dev); |
d96d1337 | 446 | |
59c85e82 JC |
447 | mutex_init(&trig->pool_lock); |
448 | trig->subirq_base | |
449 | = irq_alloc_descs(-1, 0, | |
450 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
451 | 0); | |
452 | if (trig->subirq_base < 0) { | |
453 | kfree(trig); | |
454 | return NULL; | |
455 | } | |
d536321d | 456 | |
59c85e82 | 457 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
59c85e82 JC |
458 | if (trig->name == NULL) { |
459 | irq_free_descs(trig->subirq_base, | |
460 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
461 | kfree(trig); | |
462 | return NULL; | |
463 | } | |
464 | trig->subirq_chip.name = trig->name; | |
465 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
466 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
467 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
468 | irq_set_chip(trig->subirq_base + i, | |
469 | &trig->subirq_chip); | |
470 | irq_set_handler(trig->subirq_base + i, | |
471 | &handle_simple_irq); | |
472 | irq_modify_status(trig->subirq_base + i, | |
473 | IRQ_NOREQUEST | IRQ_NOAUTOEN, | |
474 | IRQ_NOPROBE); | |
d96d1337 | 475 | } |
5f9c035c | 476 | get_device(&trig->dev); |
1637db44 | 477 | } |
d536321d JA |
478 | |
479 | return trig; | |
480 | } | |
481 | ||
482 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) | |
483 | { | |
484 | struct iio_trigger *trig; | |
485 | va_list vargs; | |
486 | ||
487 | va_start(vargs, fmt); | |
488 | trig = viio_trigger_alloc(fmt, vargs); | |
489 | va_end(vargs); | |
490 | ||
1637db44 JC |
491 | return trig; |
492 | } | |
7cbb7537 | 493 | EXPORT_SYMBOL(iio_trigger_alloc); |
1637db44 | 494 | |
7cbb7537 | 495 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
496 | { |
497 | if (trig) | |
498 | put_device(&trig->dev); | |
499 | } | |
7cbb7537 | 500 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 501 | |
d536321d JA |
502 | static void devm_iio_trigger_release(struct device *dev, void *res) |
503 | { | |
504 | iio_trigger_free(*(struct iio_trigger **)res); | |
505 | } | |
506 | ||
507 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) | |
508 | { | |
509 | struct iio_trigger **r = res; | |
510 | ||
511 | if (!r || !*r) { | |
512 | WARN_ON(!r || !*r); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | return *r == data; | |
517 | } | |
518 | ||
a7e57dce SK |
519 | /** |
520 | * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() | |
521 | * @dev: Device to allocate iio_trigger for | |
522 | * @fmt: trigger name format. If it includes format | |
523 | * specifiers, the additional arguments following | |
524 | * format are formatted and inserted in the resulting | |
525 | * string replacing their respective specifiers. | |
526 | * | |
527 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is | |
528 | * automatically freed on driver detach. | |
529 | * | |
530 | * If an iio_trigger allocated with this function needs to be freed separately, | |
531 | * devm_iio_trigger_free() must be used. | |
532 | * | |
533 | * RETURNS: | |
534 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
535 | */ | |
d536321d JA |
536 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
537 | const char *fmt, ...) | |
538 | { | |
539 | struct iio_trigger **ptr, *trig; | |
540 | va_list vargs; | |
541 | ||
542 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
543 | GFP_KERNEL); | |
544 | if (!ptr) | |
545 | return NULL; | |
546 | ||
547 | /* use raw alloc_dr for kmalloc caller tracing */ | |
548 | va_start(vargs, fmt); | |
549 | trig = viio_trigger_alloc(fmt, vargs); | |
550 | va_end(vargs); | |
551 | if (trig) { | |
552 | *ptr = trig; | |
553 | devres_add(dev, ptr); | |
554 | } else { | |
555 | devres_free(ptr); | |
556 | } | |
557 | ||
558 | return trig; | |
559 | } | |
560 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); | |
561 | ||
a7e57dce SK |
562 | /** |
563 | * devm_iio_trigger_free - Resource-managed iio_trigger_free() | |
564 | * @dev: Device this iio_dev belongs to | |
565 | * @iio_trig: the iio_trigger associated with the device | |
566 | * | |
567 | * Free iio_trigger allocated with devm_iio_trigger_alloc(). | |
568 | */ | |
d536321d JA |
569 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
570 | { | |
571 | int rc; | |
572 | ||
573 | rc = devres_release(dev, devm_iio_trigger_release, | |
574 | devm_iio_trigger_match, iio_trig); | |
575 | WARN_ON(rc); | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); | |
578 | ||
67be8e32 | 579 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 580 | { |
f8c6f4e9 | 581 | indio_dev->groups[indio_dev->groupcounter++] = |
26d25ae3 | 582 | &iio_trigger_consumer_attr_group; |
1637db44 | 583 | } |
1637db44 | 584 | |
f8c6f4e9 | 585 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 586 | { |
860c9c54 | 587 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 588 | if (indio_dev->trig) |
7cbb7537 | 589 | iio_trigger_put(indio_dev->trig); |
1637db44 | 590 | } |
1637db44 | 591 | |
3b99fb76 | 592 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
c3db00cc | 593 | { |
67be8e32 JC |
594 | return iio_trigger_attach_poll_func(indio_dev->trig, |
595 | indio_dev->pollfunc); | |
c3db00cc | 596 | } |
3b99fb76 | 597 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
c3db00cc | 598 | |
3b99fb76 | 599 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
c3db00cc | 600 | { |
034bd7b5 | 601 | return iio_trigger_detach_poll_func(indio_dev->trig, |
67be8e32 | 602 | indio_dev->pollfunc); |
c3db00cc | 603 | } |
3b99fb76 | 604 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |