Commit | Line | Data |
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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); |
99543823 CDL |
213 | |
214 | /* Get irq number */ | |
51c060a0 | 215 | pf->irq = iio_trigger_get_irq(trig); |
99543823 CDL |
216 | if (pf->irq < 0) |
217 | goto out_put_module; | |
218 | ||
219 | /* Request irq */ | |
51c060a0 JC |
220 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, |
221 | pf->type, pf->name, | |
222 | pf); | |
99543823 CDL |
223 | if (ret < 0) |
224 | goto out_put_irq; | |
5dd72ecb | 225 | |
99543823 | 226 | /* Enable trigger in driver */ |
5dd72ecb | 227 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
d29f73db | 228 | ret = trig->ops->set_trigger_state(trig, true); |
5dd72ecb | 229 | if (ret < 0) |
99543823 | 230 | goto out_free_irq; |
5dd72ecb | 231 | } |
d96d1337 | 232 | |
1637db44 | 233 | return ret; |
99543823 CDL |
234 | |
235 | out_free_irq: | |
236 | free_irq(pf->irq, pf); | |
237 | out_put_irq: | |
238 | iio_trigger_put_irq(trig, pf->irq); | |
239 | out_put_module: | |
240 | module_put(pf->indio_dev->info->driver_module); | |
241 | return ret; | |
1637db44 | 242 | } |
1637db44 | 243 | |
034bd7b5 | 244 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
208b813c | 245 | struct iio_poll_func *pf) |
1637db44 | 246 | { |
51c060a0 JC |
247 | int ret = 0; |
248 | bool no_other_users | |
249 | = (bitmap_weight(trig->pool, | |
250 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) | |
251 | == 1); | |
d29f73db JC |
252 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
253 | ret = trig->ops->set_trigger_state(trig, false); | |
51c060a0 | 254 | if (ret) |
92825ff9 | 255 | return ret; |
1637db44 | 256 | } |
51c060a0 JC |
257 | iio_trigger_put_irq(trig, pf->irq); |
258 | free_irq(pf->irq, pf); | |
f60c4a02 | 259 | module_put(pf->indio_dev->info->driver_module); |
1637db44 | 260 | |
1637db44 JC |
261 | return ret; |
262 | } | |
1637db44 | 263 | |
d96d1337 JC |
264 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
265 | { | |
266 | struct iio_poll_func *pf = p; | |
267 | pf->timestamp = iio_get_time_ns(); | |
268 | return IRQ_WAKE_THREAD; | |
269 | } | |
270 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
271 | ||
21b185f8 JC |
272 | struct iio_poll_func |
273 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
274 | irqreturn_t (*thread)(int irq, void *p), | |
275 | int type, | |
e65bc6ac | 276 | struct iio_dev *indio_dev, |
21b185f8 JC |
277 | const char *fmt, |
278 | ...) | |
279 | { | |
280 | va_list vargs; | |
281 | struct iio_poll_func *pf; | |
282 | ||
283 | pf = kmalloc(sizeof *pf, GFP_KERNEL); | |
284 | if (pf == NULL) | |
285 | return NULL; | |
286 | va_start(vargs, fmt); | |
287 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
288 | va_end(vargs); | |
289 | if (pf->name == NULL) { | |
290 | kfree(pf); | |
291 | return NULL; | |
292 | } | |
293 | pf->h = h; | |
294 | pf->thread = thread; | |
295 | pf->type = type; | |
e65bc6ac | 296 | pf->indio_dev = indio_dev; |
21b185f8 JC |
297 | |
298 | return pf; | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
301 | ||
302 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
303 | { | |
304 | kfree(pf->name); | |
305 | kfree(pf); | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
308 | ||
1637db44 | 309 | /** |
860c9c54 | 310 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
8e563b0d CO |
311 | * @dev: device associated with an industrial I/O device |
312 | * @attr: pointer to the device_attribute structure that | |
313 | * is being processed | |
314 | * @buf: buffer where the current trigger name will be printed into | |
1637db44 JC |
315 | * |
316 | * For trigger consumers the current_trigger interface allows the trigger | |
317 | * used by the device to be queried. | |
8e563b0d CO |
318 | * |
319 | * Return: a negative number on failure, the number of characters written | |
320 | * on success or 0 if no trigger is available | |
321 | */ | |
1637db44 JC |
322 | static ssize_t iio_trigger_read_current(struct device *dev, |
323 | struct device_attribute *attr, | |
324 | char *buf) | |
325 | { | |
e53f5ac5 | 326 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 327 | |
f8c6f4e9 JC |
328 | if (indio_dev->trig) |
329 | return sprintf(buf, "%s\n", indio_dev->trig->name); | |
cb6c89a0 | 330 | return 0; |
1637db44 JC |
331 | } |
332 | ||
333 | /** | |
860c9c54 | 334 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
8e563b0d CO |
335 | * @dev: device associated with an industrial I/O device |
336 | * @attr: device attribute that is being processed | |
337 | * @buf: string buffer that holds the name of the trigger | |
338 | * @len: length of the trigger name held by buf | |
1637db44 JC |
339 | * |
340 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 341 | * used for this device to be specified at run time based on the trigger's |
1637db44 | 342 | * name. |
8e563b0d CO |
343 | * |
344 | * Return: negative error code on failure or length of the buffer | |
345 | * on success | |
346 | */ | |
1637db44 JC |
347 | static ssize_t iio_trigger_write_current(struct device *dev, |
348 | struct device_attribute *attr, | |
349 | const char *buf, | |
350 | size_t len) | |
351 | { | |
e53f5ac5 | 352 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 353 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
354 | struct iio_trigger *trig; |
355 | int ret; | |
356 | ||
f8c6f4e9 JC |
357 | mutex_lock(&indio_dev->mlock); |
358 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { | |
359 | mutex_unlock(&indio_dev->mlock); | |
1637db44 JC |
360 | return -EBUSY; |
361 | } | |
f8c6f4e9 | 362 | mutex_unlock(&indio_dev->mlock); |
1637db44 | 363 | |
43a4360e | 364 | trig = iio_trigger_find_by_name(buf, len); |
5dd72ecb JC |
365 | if (oldtrig == trig) |
366 | return len; | |
43a4360e | 367 | |
f8c6f4e9 JC |
368 | if (trig && indio_dev->info->validate_trigger) { |
369 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e MH |
370 | if (ret) |
371 | return ret; | |
372 | } | |
373 | ||
d29f73db | 374 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 375 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e MH |
376 | if (ret) |
377 | return ret; | |
378 | } | |
379 | ||
f8c6f4e9 | 380 | indio_dev->trig = trig; |
43a4360e | 381 | |
735ad074 VB |
382 | if (oldtrig) { |
383 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) | |
384 | iio_trigger_detach_poll_func(oldtrig, | |
385 | indio_dev->pollfunc_event); | |
7cbb7537 | 386 | iio_trigger_put(oldtrig); |
735ad074 VB |
387 | } |
388 | if (indio_dev->trig) { | |
7cbb7537 | 389 | iio_trigger_get(indio_dev->trig); |
735ad074 VB |
390 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
391 | iio_trigger_attach_poll_func(indio_dev->trig, | |
392 | indio_dev->pollfunc_event); | |
393 | } | |
1637db44 JC |
394 | |
395 | return len; | |
396 | } | |
397 | ||
74112d3f GKH |
398 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
399 | iio_trigger_read_current, | |
400 | iio_trigger_write_current); | |
1637db44 JC |
401 | |
402 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
403 | &dev_attr_current_trigger.attr, | |
404 | NULL, | |
405 | }; | |
406 | ||
407 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
408 | .name = "trigger", | |
409 | .attrs = iio_trigger_consumer_attrs, | |
410 | }; | |
411 | ||
412 | static void iio_trig_release(struct device *device) | |
413 | { | |
414 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
415 | int i; |
416 | ||
417 | if (trig->subirq_base) { | |
418 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
419 | irq_modify_status(trig->subirq_base + i, | |
420 | IRQ_NOAUTOEN, | |
421 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
422 | irq_set_chip(trig->subirq_base + i, | |
423 | NULL); | |
424 | irq_set_handler(trig->subirq_base + i, | |
425 | NULL); | |
426 | } | |
427 | ||
428 | irq_free_descs(trig->subirq_base, | |
429 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
430 | } | |
59c85e82 | 431 | kfree(trig->name); |
1637db44 | 432 | kfree(trig); |
1637db44 JC |
433 | } |
434 | ||
435 | static struct device_type iio_trig_type = { | |
436 | .release = iio_trig_release, | |
f59c2576 | 437 | .groups = iio_trig_dev_groups, |
1637db44 JC |
438 | }; |
439 | ||
d96d1337 JC |
440 | static void iio_trig_subirqmask(struct irq_data *d) |
441 | { | |
442 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
443 | struct iio_trigger *trig | |
444 | = container_of(chip, | |
445 | struct iio_trigger, subirq_chip); | |
446 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; | |
447 | } | |
448 | ||
449 | static void iio_trig_subirqunmask(struct irq_data *d) | |
450 | { | |
451 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
452 | struct iio_trigger *trig | |
453 | = container_of(chip, | |
454 | struct iio_trigger, subirq_chip); | |
455 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; | |
456 | } | |
457 | ||
d536321d | 458 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
1637db44 JC |
459 | { |
460 | struct iio_trigger *trig; | |
461 | trig = kzalloc(sizeof *trig, GFP_KERNEL); | |
462 | if (trig) { | |
d96d1337 | 463 | int i; |
1637db44 | 464 | trig->dev.type = &iio_trig_type; |
5aaaeba8 | 465 | trig->dev.bus = &iio_bus_type; |
1637db44 | 466 | device_initialize(&trig->dev); |
d96d1337 | 467 | |
59c85e82 JC |
468 | mutex_init(&trig->pool_lock); |
469 | trig->subirq_base | |
470 | = irq_alloc_descs(-1, 0, | |
471 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
472 | 0); | |
473 | if (trig->subirq_base < 0) { | |
474 | kfree(trig); | |
475 | return NULL; | |
476 | } | |
d536321d | 477 | |
59c85e82 | 478 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
59c85e82 JC |
479 | if (trig->name == NULL) { |
480 | irq_free_descs(trig->subirq_base, | |
481 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
482 | kfree(trig); | |
483 | return NULL; | |
484 | } | |
485 | trig->subirq_chip.name = trig->name; | |
486 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
487 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
488 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
489 | irq_set_chip(trig->subirq_base + i, | |
490 | &trig->subirq_chip); | |
491 | irq_set_handler(trig->subirq_base + i, | |
492 | &handle_simple_irq); | |
493 | irq_modify_status(trig->subirq_base + i, | |
494 | IRQ_NOREQUEST | IRQ_NOAUTOEN, | |
495 | IRQ_NOPROBE); | |
d96d1337 | 496 | } |
5f9c035c | 497 | get_device(&trig->dev); |
1637db44 | 498 | } |
d536321d JA |
499 | |
500 | return trig; | |
501 | } | |
502 | ||
503 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) | |
504 | { | |
505 | struct iio_trigger *trig; | |
506 | va_list vargs; | |
507 | ||
508 | va_start(vargs, fmt); | |
509 | trig = viio_trigger_alloc(fmt, vargs); | |
510 | va_end(vargs); | |
511 | ||
1637db44 JC |
512 | return trig; |
513 | } | |
7cbb7537 | 514 | EXPORT_SYMBOL(iio_trigger_alloc); |
1637db44 | 515 | |
7cbb7537 | 516 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
517 | { |
518 | if (trig) | |
519 | put_device(&trig->dev); | |
520 | } | |
7cbb7537 | 521 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 522 | |
d536321d JA |
523 | static void devm_iio_trigger_release(struct device *dev, void *res) |
524 | { | |
525 | iio_trigger_free(*(struct iio_trigger **)res); | |
526 | } | |
527 | ||
528 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) | |
529 | { | |
530 | struct iio_trigger **r = res; | |
531 | ||
532 | if (!r || !*r) { | |
533 | WARN_ON(!r || !*r); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | return *r == data; | |
538 | } | |
539 | ||
a7e57dce SK |
540 | /** |
541 | * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() | |
542 | * @dev: Device to allocate iio_trigger for | |
543 | * @fmt: trigger name format. If it includes format | |
544 | * specifiers, the additional arguments following | |
545 | * format are formatted and inserted in the resulting | |
546 | * string replacing their respective specifiers. | |
547 | * | |
548 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is | |
549 | * automatically freed on driver detach. | |
550 | * | |
551 | * If an iio_trigger allocated with this function needs to be freed separately, | |
552 | * devm_iio_trigger_free() must be used. | |
553 | * | |
554 | * RETURNS: | |
555 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
556 | */ | |
d536321d JA |
557 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
558 | const char *fmt, ...) | |
559 | { | |
560 | struct iio_trigger **ptr, *trig; | |
561 | va_list vargs; | |
562 | ||
563 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
564 | GFP_KERNEL); | |
565 | if (!ptr) | |
566 | return NULL; | |
567 | ||
568 | /* use raw alloc_dr for kmalloc caller tracing */ | |
569 | va_start(vargs, fmt); | |
570 | trig = viio_trigger_alloc(fmt, vargs); | |
571 | va_end(vargs); | |
572 | if (trig) { | |
573 | *ptr = trig; | |
574 | devres_add(dev, ptr); | |
575 | } else { | |
576 | devres_free(ptr); | |
577 | } | |
578 | ||
579 | return trig; | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); | |
582 | ||
a7e57dce SK |
583 | /** |
584 | * devm_iio_trigger_free - Resource-managed iio_trigger_free() | |
585 | * @dev: Device this iio_dev belongs to | |
586 | * @iio_trig: the iio_trigger associated with the device | |
587 | * | |
588 | * Free iio_trigger allocated with devm_iio_trigger_alloc(). | |
589 | */ | |
d536321d JA |
590 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
591 | { | |
592 | int rc; | |
593 | ||
594 | rc = devres_release(dev, devm_iio_trigger_release, | |
595 | devm_iio_trigger_match, iio_trig); | |
596 | WARN_ON(rc); | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); | |
599 | ||
67be8e32 | 600 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 601 | { |
f8c6f4e9 | 602 | indio_dev->groups[indio_dev->groupcounter++] = |
26d25ae3 | 603 | &iio_trigger_consumer_attr_group; |
1637db44 | 604 | } |
1637db44 | 605 | |
f8c6f4e9 | 606 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 607 | { |
860c9c54 | 608 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 609 | if (indio_dev->trig) |
7cbb7537 | 610 | iio_trigger_put(indio_dev->trig); |
1637db44 | 611 | } |
1637db44 | 612 | |
3b99fb76 | 613 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
c3db00cc | 614 | { |
67be8e32 JC |
615 | return iio_trigger_attach_poll_func(indio_dev->trig, |
616 | indio_dev->pollfunc); | |
c3db00cc | 617 | } |
3b99fb76 | 618 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
c3db00cc | 619 | |
3b99fb76 | 620 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
c3db00cc | 621 | { |
034bd7b5 | 622 | return iio_trigger_detach_poll_func(indio_dev->trig, |
67be8e32 | 623 | indio_dev->pollfunc); |
c3db00cc | 624 | } |
3b99fb76 | 625 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |