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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1637db44 JC |
2 | /* The industrial I/O core, trigger handling functions |
3 | * | |
4 | * Copyright (c) 2008 Jonathan Cameron | |
1637db44 JC |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
1637db44 JC |
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> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1637db44 | 14 | |
06458e27 JC |
15 | #include <linux/iio/iio.h> |
16 | #include <linux/iio/trigger.h> | |
df9c1c42 | 17 | #include "iio_core.h" |
6aea1c36 | 18 | #include "iio_core_trigger.h" |
06458e27 | 19 | #include <linux/iio/trigger_consumer.h> |
1637db44 JC |
20 | |
21 | /* RFC - Question of approach | |
22 | * Make the common case (single sensor single trigger) | |
23 | * simple by starting trigger capture from when first sensors | |
24 | * is added. | |
25 | * | |
26 | * Complex simultaneous start requires use of 'hold' functionality | |
27 | * of the trigger. (not implemented) | |
28 | * | |
29 | * Any other suggestions? | |
30 | */ | |
31 | ||
47c24fdd | 32 | static DEFINE_IDA(iio_trigger_ida); |
1637db44 JC |
33 | |
34 | /* Single list of all available triggers */ | |
35 | static LIST_HEAD(iio_trigger_list); | |
36 | static DEFINE_MUTEX(iio_trigger_list_lock); | |
37 | ||
59c85e82 JC |
38 | /** |
39 | * iio_trigger_read_name() - retrieve useful identifying name | |
8e563b0d CO |
40 | * @dev: device associated with the iio_trigger |
41 | * @attr: pointer to the device_attribute structure that is | |
42 | * being processed | |
43 | * @buf: buffer to print the name into | |
44 | * | |
45 | * Return: a negative number on failure or the number of written | |
46 | * characters on success. | |
47 | */ | |
59c85e82 JC |
48 | static ssize_t iio_trigger_read_name(struct device *dev, |
49 | struct device_attribute *attr, | |
50 | char *buf) | |
51 | { | |
971ff1db | 52 | struct iio_trigger *trig = to_iio_trigger(dev); |
59c85e82 JC |
53 | return sprintf(buf, "%s\n", trig->name); |
54 | } | |
55 | ||
56 | static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL); | |
57 | ||
6d459aa0 LPC |
58 | static struct attribute *iio_trig_dev_attrs[] = { |
59 | &dev_attr_name.attr, | |
60 | NULL, | |
61 | }; | |
f59c2576 | 62 | ATTRIBUTE_GROUPS(iio_trig_dev); |
1637db44 | 63 | |
3b8e73ec CDL |
64 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name); |
65 | ||
035c70ae JC |
66 | int __iio_trigger_register(struct iio_trigger *trig_info, |
67 | struct module *this_mod) | |
1637db44 JC |
68 | { |
69 | int ret; | |
70 | ||
035c70ae JC |
71 | trig_info->owner = this_mod; |
72 | ||
47c24fdd | 73 | trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL); |
92825ff9 HK |
74 | if (trig_info->id < 0) |
75 | return trig_info->id; | |
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); | |
3b8e73ec CDL |
87 | if (__iio_trigger_find_by_name(trig_info->name)) { |
88 | pr_err("Duplicate trigger name '%s'\n", trig_info->name); | |
89 | ret = -EEXIST; | |
90 | goto error_device_del; | |
91 | } | |
1637db44 JC |
92 | list_add_tail(&trig_info->list, &iio_trigger_list); |
93 | mutex_unlock(&iio_trigger_list_lock); | |
94 | ||
95 | return 0; | |
96 | ||
3b8e73ec CDL |
97 | error_device_del: |
98 | mutex_unlock(&iio_trigger_list_lock); | |
99 | device_del(&trig_info->dev); | |
1637db44 | 100 | error_unregister_id: |
47c24fdd | 101 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 JC |
102 | return ret; |
103 | } | |
035c70ae | 104 | EXPORT_SYMBOL(__iio_trigger_register); |
1637db44 JC |
105 | |
106 | void iio_trigger_unregister(struct iio_trigger *trig_info) | |
107 | { | |
1637db44 | 108 | mutex_lock(&iio_trigger_list_lock); |
582e5489 | 109 | list_del(&trig_info->list); |
1637db44 JC |
110 | mutex_unlock(&iio_trigger_list_lock); |
111 | ||
47c24fdd | 112 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
1637db44 | 113 | /* Possible issue in here */ |
8bade406 | 114 | device_del(&trig_info->dev); |
1637db44 JC |
115 | } |
116 | EXPORT_SYMBOL(iio_trigger_unregister); | |
117 | ||
c8cdf708 MR |
118 | int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig) |
119 | { | |
120 | if (!indio_dev || !trig) | |
121 | return -EINVAL; | |
122 | ||
123 | mutex_lock(&indio_dev->mlock); | |
124 | WARN_ON(indio_dev->trig_readonly); | |
125 | ||
126 | indio_dev->trig = iio_trigger_get(trig); | |
127 | indio_dev->trig_readonly = true; | |
128 | mutex_unlock(&indio_dev->mlock); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | EXPORT_SYMBOL(iio_trigger_set_immutable); | |
133 | ||
3b8e73ec CDL |
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 | ||
d5d24bcc | 146 | static struct iio_trigger *iio_trigger_acquire_by_name(const char *name) |
1637db44 | 147 | { |
f6517f22 | 148 | struct iio_trigger *trig = NULL, *iter; |
7c327857 | 149 | |
1637db44 | 150 | mutex_lock(&iio_trigger_list_lock); |
f6517f22 JC |
151 | list_for_each_entry(iter, &iio_trigger_list, list) |
152 | if (sysfs_streq(iter->name, name)) { | |
153 | trig = iter; | |
d5d24bcc | 154 | iio_trigger_get(trig); |
1637db44 JC |
155 | break; |
156 | } | |
1637db44 JC |
157 | mutex_unlock(&iio_trigger_list_lock); |
158 | ||
f6517f22 | 159 | return trig; |
5f87404d | 160 | } |
1637db44 | 161 | |
398fd22b | 162 | void iio_trigger_poll(struct iio_trigger *trig) |
1637db44 | 163 | { |
d96d1337 | 164 | int i; |
a1a8e1dc LPC |
165 | |
166 | if (!atomic_read(&trig->use_count)) { | |
167 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
168 | ||
169 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
170 | if (trig->subirqs[i].enabled) | |
d96d1337 | 171 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
172 | else |
173 | iio_trigger_notify_done(trig); | |
174 | } | |
175 | } | |
1637db44 JC |
176 | } |
177 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
178 | |
179 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
180 | { | |
398fd22b | 181 | iio_trigger_poll(private); |
8384d957 JC |
182 | return IRQ_HANDLED; |
183 | } | |
184 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 185 | |
398fd22b | 186 | void iio_trigger_poll_chained(struct iio_trigger *trig) |
1f785681 JC |
187 | { |
188 | int i; | |
a1a8e1dc LPC |
189 | |
190 | if (!atomic_read(&trig->use_count)) { | |
191 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
192 | ||
193 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
194 | if (trig->subirqs[i].enabled) | |
1f785681 | 195 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
196 | else |
197 | iio_trigger_notify_done(trig); | |
198 | } | |
199 | } | |
1f785681 JC |
200 | } |
201 | EXPORT_SYMBOL(iio_trigger_poll_chained); | |
202 | ||
1637db44 JC |
203 | void iio_trigger_notify_done(struct iio_trigger *trig) |
204 | { | |
04581681 JC |
205 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
206 | trig->ops->try_reenable) | |
e69616b1 | 207 | if (trig->ops->try_reenable(trig)) |
860c9c54 | 208 | /* Missed an interrupt so launch new poll now */ |
398fd22b | 209 | iio_trigger_poll(trig); |
1637db44 JC |
210 | } |
211 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
212 | ||
1637db44 | 213 | /* Trigger Consumer related functions */ |
208b813c JC |
214 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
215 | { | |
216 | int ret; | |
217 | mutex_lock(&trig->pool_lock); | |
218 | ret = bitmap_find_free_region(trig->pool, | |
219 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
220 | ilog2(1)); | |
221 | mutex_unlock(&trig->pool_lock); | |
222 | if (ret >= 0) | |
223 | ret += trig->subirq_base; | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
229 | { | |
230 | mutex_lock(&trig->pool_lock); | |
231 | clear_bit(irq - trig->subirq_base, trig->pool); | |
232 | mutex_unlock(&trig->pool_lock); | |
233 | } | |
1637db44 JC |
234 | |
235 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
236 | * may be needed if the pollfuncs do not include the data read for the | |
237 | * triggering device. | |
238 | * This is not currently handled. Alternative of not enabling trigger unless | |
239 | * the relevant function is in there may be the best option. | |
240 | */ | |
860c9c54 | 241 | /* Worth protecting against double additions? */ |
208b813c JC |
242 | static int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
243 | struct iio_poll_func *pf) | |
1637db44 JC |
244 | { |
245 | int ret = 0; | |
51c060a0 JC |
246 | bool notinuse |
247 | = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
248 | ||
860c9c54 | 249 | /* Prevent the module from being removed whilst attached to a trigger */ |
63b19547 | 250 | __module_get(pf->indio_dev->driver_module); |
99543823 CDL |
251 | |
252 | /* Get irq number */ | |
51c060a0 | 253 | pf->irq = iio_trigger_get_irq(trig); |
be35d281 MO |
254 | if (pf->irq < 0) { |
255 | pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n", | |
256 | trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
99543823 | 257 | goto out_put_module; |
be35d281 | 258 | } |
99543823 CDL |
259 | |
260 | /* Request irq */ | |
51c060a0 JC |
261 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, |
262 | pf->type, pf->name, | |
263 | pf); | |
99543823 CDL |
264 | if (ret < 0) |
265 | goto out_put_irq; | |
5dd72ecb | 266 | |
99543823 | 267 | /* Enable trigger in driver */ |
04581681 | 268 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
d29f73db | 269 | ret = trig->ops->set_trigger_state(trig, true); |
5dd72ecb | 270 | if (ret < 0) |
99543823 | 271 | goto out_free_irq; |
5dd72ecb | 272 | } |
d96d1337 | 273 | |
702a7b8e LW |
274 | /* |
275 | * Check if we just registered to our own trigger: we determine that | |
276 | * this is the case if the IIO device and the trigger device share the | |
277 | * same parent device. | |
278 | */ | |
279 | if (pf->indio_dev->dev.parent == trig->dev.parent) | |
280 | trig->attached_own_device = true; | |
281 | ||
1637db44 | 282 | return ret; |
99543823 CDL |
283 | |
284 | out_free_irq: | |
285 | free_irq(pf->irq, pf); | |
286 | out_put_irq: | |
287 | iio_trigger_put_irq(trig, pf->irq); | |
288 | out_put_module: | |
63b19547 | 289 | module_put(pf->indio_dev->driver_module); |
99543823 | 290 | return ret; |
1637db44 | 291 | } |
1637db44 | 292 | |
034bd7b5 | 293 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
208b813c | 294 | struct iio_poll_func *pf) |
1637db44 | 295 | { |
51c060a0 JC |
296 | int ret = 0; |
297 | bool no_other_users | |
298 | = (bitmap_weight(trig->pool, | |
299 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) | |
300 | == 1); | |
04581681 | 301 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
d29f73db | 302 | ret = trig->ops->set_trigger_state(trig, false); |
51c060a0 | 303 | if (ret) |
92825ff9 | 304 | return ret; |
1637db44 | 305 | } |
702a7b8e LW |
306 | if (pf->indio_dev->dev.parent == trig->dev.parent) |
307 | trig->attached_own_device = false; | |
51c060a0 JC |
308 | iio_trigger_put_irq(trig, pf->irq); |
309 | free_irq(pf->irq, pf); | |
63b19547 | 310 | module_put(pf->indio_dev->driver_module); |
1637db44 | 311 | |
1637db44 JC |
312 | return ret; |
313 | } | |
1637db44 | 314 | |
d96d1337 JC |
315 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
316 | { | |
317 | struct iio_poll_func *pf = p; | |
bc2b7dab | 318 | pf->timestamp = iio_get_time_ns(pf->indio_dev); |
d96d1337 JC |
319 | return IRQ_WAKE_THREAD; |
320 | } | |
321 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
322 | ||
21b185f8 JC |
323 | struct iio_poll_func |
324 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
325 | irqreturn_t (*thread)(int irq, void *p), | |
326 | int type, | |
e65bc6ac | 327 | struct iio_dev *indio_dev, |
21b185f8 JC |
328 | const char *fmt, |
329 | ...) | |
330 | { | |
331 | va_list vargs; | |
332 | struct iio_poll_func *pf; | |
333 | ||
334 | pf = kmalloc(sizeof *pf, GFP_KERNEL); | |
335 | if (pf == NULL) | |
336 | return NULL; | |
337 | va_start(vargs, fmt); | |
338 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
339 | va_end(vargs); | |
340 | if (pf->name == NULL) { | |
341 | kfree(pf); | |
342 | return NULL; | |
343 | } | |
344 | pf->h = h; | |
345 | pf->thread = thread; | |
346 | pf->type = type; | |
e65bc6ac | 347 | pf->indio_dev = indio_dev; |
21b185f8 JC |
348 | |
349 | return pf; | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
352 | ||
353 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
354 | { | |
355 | kfree(pf->name); | |
356 | kfree(pf); | |
357 | } | |
358 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
359 | ||
1637db44 | 360 | /** |
860c9c54 | 361 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
8e563b0d CO |
362 | * @dev: device associated with an industrial I/O device |
363 | * @attr: pointer to the device_attribute structure that | |
364 | * is being processed | |
365 | * @buf: buffer where the current trigger name will be printed into | |
1637db44 JC |
366 | * |
367 | * For trigger consumers the current_trigger interface allows the trigger | |
368 | * used by the device to be queried. | |
8e563b0d CO |
369 | * |
370 | * Return: a negative number on failure, the number of characters written | |
371 | * on success or 0 if no trigger is available | |
372 | */ | |
1637db44 JC |
373 | static ssize_t iio_trigger_read_current(struct device *dev, |
374 | struct device_attribute *attr, | |
375 | char *buf) | |
376 | { | |
e53f5ac5 | 377 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 378 | |
f8c6f4e9 JC |
379 | if (indio_dev->trig) |
380 | return sprintf(buf, "%s\n", indio_dev->trig->name); | |
cb6c89a0 | 381 | return 0; |
1637db44 JC |
382 | } |
383 | ||
384 | /** | |
860c9c54 | 385 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
8e563b0d CO |
386 | * @dev: device associated with an industrial I/O device |
387 | * @attr: device attribute that is being processed | |
388 | * @buf: string buffer that holds the name of the trigger | |
389 | * @len: length of the trigger name held by buf | |
1637db44 JC |
390 | * |
391 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 392 | * used for this device to be specified at run time based on the trigger's |
1637db44 | 393 | * name. |
8e563b0d CO |
394 | * |
395 | * Return: negative error code on failure or length of the buffer | |
396 | * on success | |
397 | */ | |
1637db44 JC |
398 | static ssize_t iio_trigger_write_current(struct device *dev, |
399 | struct device_attribute *attr, | |
400 | const char *buf, | |
401 | size_t len) | |
402 | { | |
e53f5ac5 | 403 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 404 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
405 | struct iio_trigger *trig; |
406 | int ret; | |
407 | ||
f8c6f4e9 JC |
408 | mutex_lock(&indio_dev->mlock); |
409 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { | |
410 | mutex_unlock(&indio_dev->mlock); | |
1637db44 JC |
411 | return -EBUSY; |
412 | } | |
c8cdf708 MR |
413 | if (indio_dev->trig_readonly) { |
414 | mutex_unlock(&indio_dev->mlock); | |
415 | return -EPERM; | |
416 | } | |
f8c6f4e9 | 417 | mutex_unlock(&indio_dev->mlock); |
1637db44 | 418 | |
d5d24bcc AS |
419 | trig = iio_trigger_acquire_by_name(buf); |
420 | if (oldtrig == trig) { | |
421 | ret = len; | |
422 | goto out_trigger_put; | |
423 | } | |
43a4360e | 424 | |
f8c6f4e9 JC |
425 | if (trig && indio_dev->info->validate_trigger) { |
426 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e | 427 | if (ret) |
d5d24bcc | 428 | goto out_trigger_put; |
43a4360e MH |
429 | } |
430 | ||
04581681 | 431 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 432 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e | 433 | if (ret) |
d5d24bcc | 434 | goto out_trigger_put; |
43a4360e MH |
435 | } |
436 | ||
f8c6f4e9 | 437 | indio_dev->trig = trig; |
43a4360e | 438 | |
735ad074 VB |
439 | if (oldtrig) { |
440 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) | |
441 | iio_trigger_detach_poll_func(oldtrig, | |
442 | indio_dev->pollfunc_event); | |
7cbb7537 | 443 | iio_trigger_put(oldtrig); |
735ad074 VB |
444 | } |
445 | if (indio_dev->trig) { | |
735ad074 VB |
446 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
447 | iio_trigger_attach_poll_func(indio_dev->trig, | |
448 | indio_dev->pollfunc_event); | |
449 | } | |
1637db44 JC |
450 | |
451 | return len; | |
d5d24bcc AS |
452 | |
453 | out_trigger_put: | |
4eecbe81 MN |
454 | if (trig) |
455 | iio_trigger_put(trig); | |
d5d24bcc | 456 | return ret; |
1637db44 JC |
457 | } |
458 | ||
74112d3f GKH |
459 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
460 | iio_trigger_read_current, | |
461 | iio_trigger_write_current); | |
1637db44 JC |
462 | |
463 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
464 | &dev_attr_current_trigger.attr, | |
465 | NULL, | |
466 | }; | |
467 | ||
468 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
469 | .name = "trigger", | |
470 | .attrs = iio_trigger_consumer_attrs, | |
471 | }; | |
472 | ||
473 | static void iio_trig_release(struct device *device) | |
474 | { | |
475 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
476 | int i; |
477 | ||
478 | if (trig->subirq_base) { | |
479 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
480 | irq_modify_status(trig->subirq_base + i, | |
481 | IRQ_NOAUTOEN, | |
482 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
483 | irq_set_chip(trig->subirq_base + i, | |
484 | NULL); | |
485 | irq_set_handler(trig->subirq_base + i, | |
486 | NULL); | |
487 | } | |
488 | ||
489 | irq_free_descs(trig->subirq_base, | |
490 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
491 | } | |
59c85e82 | 492 | kfree(trig->name); |
1637db44 | 493 | kfree(trig); |
1637db44 JC |
494 | } |
495 | ||
3bdafc49 | 496 | static const struct device_type iio_trig_type = { |
1637db44 | 497 | .release = iio_trig_release, |
f59c2576 | 498 | .groups = iio_trig_dev_groups, |
1637db44 JC |
499 | }; |
500 | ||
d96d1337 JC |
501 | static void iio_trig_subirqmask(struct irq_data *d) |
502 | { | |
503 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
504 | struct iio_trigger *trig | |
505 | = container_of(chip, | |
506 | struct iio_trigger, subirq_chip); | |
507 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; | |
508 | } | |
509 | ||
510 | static void iio_trig_subirqunmask(struct irq_data *d) | |
511 | { | |
512 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
513 | struct iio_trigger *trig | |
514 | = container_of(chip, | |
515 | struct iio_trigger, subirq_chip); | |
516 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; | |
517 | } | |
518 | ||
d536321d | 519 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
1637db44 JC |
520 | { |
521 | struct iio_trigger *trig; | |
2c99f1a0 DC |
522 | int i; |
523 | ||
1637db44 | 524 | trig = kzalloc(sizeof *trig, GFP_KERNEL); |
2c99f1a0 DC |
525 | if (!trig) |
526 | return NULL; | |
d536321d | 527 | |
2c99f1a0 DC |
528 | trig->dev.type = &iio_trig_type; |
529 | trig->dev.bus = &iio_bus_type; | |
530 | device_initialize(&trig->dev); | |
531 | ||
532 | mutex_init(&trig->pool_lock); | |
533 | trig->subirq_base = irq_alloc_descs(-1, 0, | |
534 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
535 | 0); | |
536 | if (trig->subirq_base < 0) | |
537 | goto free_trig; | |
538 | ||
539 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
540 | if (trig->name == NULL) | |
541 | goto free_descs; | |
542 | ||
543 | trig->subirq_chip.name = trig->name; | |
544 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
545 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
546 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
547 | irq_set_chip(trig->subirq_base + i, &trig->subirq_chip); | |
548 | irq_set_handler(trig->subirq_base + i, &handle_simple_irq); | |
549 | irq_modify_status(trig->subirq_base + i, | |
550 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); | |
1637db44 | 551 | } |
2c99f1a0 | 552 | get_device(&trig->dev); |
d536321d JA |
553 | |
554 | return trig; | |
2c99f1a0 DC |
555 | |
556 | free_descs: | |
557 | irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
558 | free_trig: | |
559 | kfree(trig); | |
560 | return NULL; | |
d536321d JA |
561 | } |
562 | ||
563 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) | |
564 | { | |
565 | struct iio_trigger *trig; | |
566 | va_list vargs; | |
567 | ||
568 | va_start(vargs, fmt); | |
569 | trig = viio_trigger_alloc(fmt, vargs); | |
570 | va_end(vargs); | |
571 | ||
1637db44 JC |
572 | return trig; |
573 | } | |
7cbb7537 | 574 | EXPORT_SYMBOL(iio_trigger_alloc); |
1637db44 | 575 | |
7cbb7537 | 576 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
577 | { |
578 | if (trig) | |
579 | put_device(&trig->dev); | |
580 | } | |
7cbb7537 | 581 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 582 | |
d536321d JA |
583 | static void devm_iio_trigger_release(struct device *dev, void *res) |
584 | { | |
585 | iio_trigger_free(*(struct iio_trigger **)res); | |
586 | } | |
587 | ||
588 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) | |
589 | { | |
590 | struct iio_trigger **r = res; | |
591 | ||
592 | if (!r || !*r) { | |
593 | WARN_ON(!r || !*r); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | return *r == data; | |
598 | } | |
599 | ||
a7e57dce SK |
600 | /** |
601 | * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() | |
602 | * @dev: Device to allocate iio_trigger for | |
603 | * @fmt: trigger name format. If it includes format | |
604 | * specifiers, the additional arguments following | |
605 | * format are formatted and inserted in the resulting | |
606 | * string replacing their respective specifiers. | |
607 | * | |
608 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is | |
609 | * automatically freed on driver detach. | |
610 | * | |
611 | * If an iio_trigger allocated with this function needs to be freed separately, | |
612 | * devm_iio_trigger_free() must be used. | |
613 | * | |
614 | * RETURNS: | |
615 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
616 | */ | |
d536321d JA |
617 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
618 | const char *fmt, ...) | |
619 | { | |
620 | struct iio_trigger **ptr, *trig; | |
621 | va_list vargs; | |
622 | ||
623 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
624 | GFP_KERNEL); | |
625 | if (!ptr) | |
626 | return NULL; | |
627 | ||
628 | /* use raw alloc_dr for kmalloc caller tracing */ | |
629 | va_start(vargs, fmt); | |
630 | trig = viio_trigger_alloc(fmt, vargs); | |
631 | va_end(vargs); | |
632 | if (trig) { | |
633 | *ptr = trig; | |
634 | devres_add(dev, ptr); | |
635 | } else { | |
636 | devres_free(ptr); | |
637 | } | |
638 | ||
639 | return trig; | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); | |
642 | ||
a7e57dce SK |
643 | /** |
644 | * devm_iio_trigger_free - Resource-managed iio_trigger_free() | |
645 | * @dev: Device this iio_dev belongs to | |
646 | * @iio_trig: the iio_trigger associated with the device | |
647 | * | |
648 | * Free iio_trigger allocated with devm_iio_trigger_alloc(). | |
649 | */ | |
d536321d JA |
650 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
651 | { | |
652 | int rc; | |
653 | ||
654 | rc = devres_release(dev, devm_iio_trigger_release, | |
655 | devm_iio_trigger_match, iio_trig); | |
656 | WARN_ON(rc); | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); | |
659 | ||
9083325f GB |
660 | static void devm_iio_trigger_unreg(struct device *dev, void *res) |
661 | { | |
662 | iio_trigger_unregister(*(struct iio_trigger **)res); | |
663 | } | |
664 | ||
665 | /** | |
035c70ae | 666 | * __devm_iio_trigger_register - Resource-managed iio_trigger_register() |
9083325f GB |
667 | * @dev: device this trigger was allocated for |
668 | * @trig_info: trigger to register | |
035c70ae | 669 | * @this_mod: module registering the trigger |
9083325f GB |
670 | * |
671 | * Managed iio_trigger_register(). The IIO trigger registered with this | |
672 | * function is automatically unregistered on driver detach. This function | |
673 | * calls iio_trigger_register() internally. Refer to that function for more | |
674 | * information. | |
675 | * | |
676 | * If an iio_trigger registered with this function needs to be unregistered | |
677 | * separately, devm_iio_trigger_unregister() must be used. | |
678 | * | |
679 | * RETURNS: | |
680 | * 0 on success, negative error number on failure. | |
681 | */ | |
035c70ae JC |
682 | int __devm_iio_trigger_register(struct device *dev, |
683 | struct iio_trigger *trig_info, | |
684 | struct module *this_mod) | |
9083325f GB |
685 | { |
686 | struct iio_trigger **ptr; | |
687 | int ret; | |
688 | ||
689 | ptr = devres_alloc(devm_iio_trigger_unreg, sizeof(*ptr), GFP_KERNEL); | |
690 | if (!ptr) | |
691 | return -ENOMEM; | |
692 | ||
693 | *ptr = trig_info; | |
035c70ae | 694 | ret = __iio_trigger_register(trig_info, this_mod); |
9083325f GB |
695 | if (!ret) |
696 | devres_add(dev, ptr); | |
697 | else | |
698 | devres_free(ptr); | |
699 | ||
700 | return ret; | |
701 | } | |
035c70ae | 702 | EXPORT_SYMBOL_GPL(__devm_iio_trigger_register); |
9083325f GB |
703 | |
704 | /** | |
705 | * devm_iio_trigger_unregister - Resource-managed iio_trigger_unregister() | |
706 | * @dev: device this iio_trigger belongs to | |
707 | * @trig_info: the trigger associated with the device | |
708 | * | |
709 | * Unregister trigger registered with devm_iio_trigger_register(). | |
710 | */ | |
711 | void devm_iio_trigger_unregister(struct device *dev, | |
712 | struct iio_trigger *trig_info) | |
713 | { | |
714 | int rc; | |
715 | ||
716 | rc = devres_release(dev, devm_iio_trigger_unreg, devm_iio_trigger_match, | |
717 | trig_info); | |
718 | WARN_ON(rc); | |
719 | } | |
720 | EXPORT_SYMBOL_GPL(devm_iio_trigger_unregister); | |
721 | ||
702a7b8e LW |
722 | bool iio_trigger_using_own(struct iio_dev *indio_dev) |
723 | { | |
724 | return indio_dev->trig->attached_own_device; | |
725 | } | |
726 | EXPORT_SYMBOL(iio_trigger_using_own); | |
727 | ||
43ece27e LPC |
728 | /** |
729 | * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to | |
730 | * the same device | |
731 | * @trig: The IIO trigger to check | |
732 | * @indio_dev: the IIO device to check | |
733 | * | |
734 | * This function can be used as the validate_device callback for triggers that | |
735 | * can only be attached to their own device. | |
736 | * | |
737 | * Return: 0 if both the trigger and the IIO device belong to the same | |
738 | * device, -EINVAL otherwise. | |
739 | */ | |
740 | int iio_trigger_validate_own_device(struct iio_trigger *trig, | |
741 | struct iio_dev *indio_dev) | |
742 | { | |
743 | if (indio_dev->dev.parent != trig->dev.parent) | |
744 | return -EINVAL; | |
745 | return 0; | |
746 | } | |
747 | EXPORT_SYMBOL(iio_trigger_validate_own_device); | |
748 | ||
67be8e32 | 749 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 750 | { |
f8c6f4e9 | 751 | indio_dev->groups[indio_dev->groupcounter++] = |
26d25ae3 | 752 | &iio_trigger_consumer_attr_group; |
1637db44 | 753 | } |
1637db44 | 754 | |
f8c6f4e9 | 755 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 756 | { |
860c9c54 | 757 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 758 | if (indio_dev->trig) |
7cbb7537 | 759 | iio_trigger_put(indio_dev->trig); |
1637db44 | 760 | } |
1637db44 | 761 | |
3b99fb76 | 762 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
c3db00cc | 763 | { |
67be8e32 JC |
764 | return iio_trigger_attach_poll_func(indio_dev->trig, |
765 | indio_dev->pollfunc); | |
c3db00cc | 766 | } |
3b99fb76 | 767 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
c3db00cc | 768 | |
3b99fb76 | 769 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
c3db00cc | 770 | { |
034bd7b5 | 771 | return iio_trigger_detach_poll_func(indio_dev->trig, |
67be8e32 | 772 | indio_dev->pollfunc); |
c3db00cc | 773 | } |
3b99fb76 | 774 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |