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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 | 15 | #include <linux/iio/iio.h> |
6eaf9f6a | 16 | #include <linux/iio/iio-opaque.h> |
06458e27 | 17 | #include <linux/iio/trigger.h> |
df9c1c42 | 18 | #include "iio_core.h" |
6aea1c36 | 19 | #include "iio_core_trigger.h" |
06458e27 | 20 | #include <linux/iio/trigger_consumer.h> |
1637db44 JC |
21 | |
22 | /* RFC - Question of approach | |
23 | * Make the common case (single sensor single trigger) | |
24 | * simple by starting trigger capture from when first sensors | |
25 | * is added. | |
26 | * | |
27 | * Complex simultaneous start requires use of 'hold' functionality | |
28 | * of the trigger. (not implemented) | |
29 | * | |
30 | * Any other suggestions? | |
31 | */ | |
32 | ||
47c24fdd | 33 | static DEFINE_IDA(iio_trigger_ida); |
1637db44 JC |
34 | |
35 | /* Single list of all available triggers */ | |
36 | static LIST_HEAD(iio_trigger_list); | |
37 | static DEFINE_MUTEX(iio_trigger_list_lock); | |
38 | ||
59c85e82 | 39 | /** |
9cf0b618 | 40 | * name_show() - retrieve useful identifying name |
8e563b0d CO |
41 | * @dev: device associated with the iio_trigger |
42 | * @attr: pointer to the device_attribute structure that is | |
43 | * being processed | |
44 | * @buf: buffer to print the name into | |
45 | * | |
46 | * Return: a negative number on failure or the number of written | |
47 | * characters on success. | |
48 | */ | |
9cf0b618 JST |
49 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
50 | char *buf) | |
59c85e82 | 51 | { |
971ff1db | 52 | struct iio_trigger *trig = to_iio_trigger(dev); |
9d9ec8d0 | 53 | |
83ca56b6 | 54 | return sysfs_emit(buf, "%s\n", trig->name); |
59c85e82 JC |
55 | } |
56 | ||
9cf0b618 | 57 | static DEVICE_ATTR_RO(name); |
59c85e82 | 58 | |
6d459aa0 LPC |
59 | static struct attribute *iio_trig_dev_attrs[] = { |
60 | &dev_attr_name.attr, | |
61 | NULL, | |
62 | }; | |
f59c2576 | 63 | ATTRIBUTE_GROUPS(iio_trig_dev); |
1637db44 | 64 | |
3b8e73ec CDL |
65 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name); |
66 | ||
bc72d938 | 67 | int iio_trigger_register(struct iio_trigger *trig_info) |
1637db44 JC |
68 | { |
69 | int ret; | |
70 | ||
319dbcd8 | 71 | trig_info->id = ida_alloc(&iio_trigger_ida, GFP_KERNEL); |
92825ff9 HK |
72 | if (trig_info->id < 0) |
73 | return trig_info->id; | |
74 | ||
1637db44 | 75 | /* Set the name used for the sysfs directory etc */ |
ebb9493c | 76 | dev_set_name(&trig_info->dev, "trigger%d", trig_info->id); |
1637db44 JC |
77 | |
78 | ret = device_add(&trig_info->dev); | |
79 | if (ret) | |
80 | goto error_unregister_id; | |
81 | ||
1637db44 JC |
82 | /* Add to list of available triggers held by the IIO core */ |
83 | mutex_lock(&iio_trigger_list_lock); | |
3b8e73ec CDL |
84 | if (__iio_trigger_find_by_name(trig_info->name)) { |
85 | pr_err("Duplicate trigger name '%s'\n", trig_info->name); | |
86 | ret = -EEXIST; | |
87 | goto error_device_del; | |
88 | } | |
1637db44 JC |
89 | list_add_tail(&trig_info->list, &iio_trigger_list); |
90 | mutex_unlock(&iio_trigger_list_lock); | |
91 | ||
92 | return 0; | |
93 | ||
3b8e73ec CDL |
94 | error_device_del: |
95 | mutex_unlock(&iio_trigger_list_lock); | |
96 | device_del(&trig_info->dev); | |
1637db44 | 97 | error_unregister_id: |
319dbcd8 | 98 | ida_free(&iio_trigger_ida, trig_info->id); |
1637db44 JC |
99 | return ret; |
100 | } | |
bc72d938 | 101 | EXPORT_SYMBOL(iio_trigger_register); |
1637db44 JC |
102 | |
103 | void iio_trigger_unregister(struct iio_trigger *trig_info) | |
104 | { | |
1637db44 | 105 | mutex_lock(&iio_trigger_list_lock); |
582e5489 | 106 | list_del(&trig_info->list); |
1637db44 JC |
107 | mutex_unlock(&iio_trigger_list_lock); |
108 | ||
319dbcd8 | 109 | ida_free(&iio_trigger_ida, trig_info->id); |
1637db44 | 110 | /* Possible issue in here */ |
8bade406 | 111 | device_del(&trig_info->dev); |
1637db44 JC |
112 | } |
113 | EXPORT_SYMBOL(iio_trigger_unregister); | |
114 | ||
c8cdf708 MR |
115 | int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig) |
116 | { | |
3028e0c2 JC |
117 | struct iio_dev_opaque *iio_dev_opaque; |
118 | ||
c8cdf708 MR |
119 | if (!indio_dev || !trig) |
120 | return -EINVAL; | |
121 | ||
3028e0c2 | 122 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
16afe125 | 123 | mutex_lock(&iio_dev_opaque->mlock); |
3028e0c2 | 124 | WARN_ON(iio_dev_opaque->trig_readonly); |
c8cdf708 MR |
125 | |
126 | indio_dev->trig = iio_trigger_get(trig); | |
3028e0c2 | 127 | iio_dev_opaque->trig_readonly = true; |
16afe125 | 128 | mutex_unlock(&iio_dev_opaque->mlock); |
c8cdf708 MR |
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 | |
9020ef65 JC |
162 | static void iio_reenable_work_fn(struct work_struct *work) |
163 | { | |
164 | struct iio_trigger *trig = container_of(work, struct iio_trigger, | |
165 | reenable_work); | |
166 | ||
167 | /* | |
168 | * This 'might' occur after the trigger state is set to disabled - | |
169 | * in that case the driver should skip reenabling. | |
170 | */ | |
171 | trig->ops->reenable(trig); | |
172 | } | |
173 | ||
174 | /* | |
175 | * In general, reenable callbacks may need to sleep and this path is | |
176 | * not performance sensitive, so just queue up a work item | |
177 | * to reneable the trigger for us. | |
178 | * | |
179 | * Races that can cause this. | |
180 | * 1) A handler occurs entirely in interrupt context so the counter | |
181 | * the final decrement is still in this interrupt. | |
182 | * 2) The trigger has been removed, but one last interrupt gets through. | |
183 | * | |
184 | * For (1) we must call reenable, but not in atomic context. | |
185 | * For (2) it should be safe to call reenanble, if drivers never blindly | |
186 | * reenable after state is off. | |
187 | */ | |
188 | static void iio_trigger_notify_done_atomic(struct iio_trigger *trig) | |
189 | { | |
190 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && | |
191 | trig->ops->reenable) | |
192 | schedule_work(&trig->reenable_work); | |
193 | } | |
194 | ||
4ad682e0 MD |
195 | /** |
196 | * iio_trigger_poll() - Call the IRQ trigger handler of the consumers | |
197 | * @trig: trigger which occurred | |
198 | * | |
199 | * This function should only be called from a hard IRQ context. | |
200 | */ | |
398fd22b | 201 | void iio_trigger_poll(struct iio_trigger *trig) |
1637db44 | 202 | { |
d96d1337 | 203 | int i; |
a1a8e1dc LPC |
204 | |
205 | if (!atomic_read(&trig->use_count)) { | |
206 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
207 | ||
208 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
209 | if (trig->subirqs[i].enabled) | |
d96d1337 | 210 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc | 211 | else |
9020ef65 | 212 | iio_trigger_notify_done_atomic(trig); |
a1a8e1dc LPC |
213 | } |
214 | } | |
1637db44 JC |
215 | } |
216 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
217 | |
218 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
219 | { | |
398fd22b | 220 | iio_trigger_poll(private); |
8384d957 JC |
221 | return IRQ_HANDLED; |
222 | } | |
223 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 224 | |
f700e55e MD |
225 | /** |
226 | * iio_trigger_poll_nested() - Call the threaded trigger handler of the | |
227 | * consumers | |
228 | * @trig: trigger which occurred | |
229 | * | |
230 | * This function should only be called from a kernel thread context. | |
231 | */ | |
232 | void iio_trigger_poll_nested(struct iio_trigger *trig) | |
1f785681 JC |
233 | { |
234 | int i; | |
a1a8e1dc LPC |
235 | |
236 | if (!atomic_read(&trig->use_count)) { | |
237 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
238 | ||
239 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
240 | if (trig->subirqs[i].enabled) | |
1f785681 | 241 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
242 | else |
243 | iio_trigger_notify_done(trig); | |
244 | } | |
245 | } | |
1f785681 | 246 | } |
f700e55e | 247 | EXPORT_SYMBOL(iio_trigger_poll_nested); |
1f785681 | 248 | |
1637db44 JC |
249 | void iio_trigger_notify_done(struct iio_trigger *trig) |
250 | { | |
04581681 | 251 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
eca8523a JC |
252 | trig->ops->reenable) |
253 | trig->ops->reenable(trig); | |
1637db44 JC |
254 | } |
255 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
256 | ||
1637db44 | 257 | /* Trigger Consumer related functions */ |
208b813c JC |
258 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
259 | { | |
260 | int ret; | |
af3bac44 | 261 | |
208b813c JC |
262 | mutex_lock(&trig->pool_lock); |
263 | ret = bitmap_find_free_region(trig->pool, | |
264 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
265 | ilog2(1)); | |
266 | mutex_unlock(&trig->pool_lock); | |
267 | if (ret >= 0) | |
268 | ret += trig->subirq_base; | |
269 | ||
270 | return ret; | |
271 | } | |
272 | ||
273 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
274 | { | |
275 | mutex_lock(&trig->pool_lock); | |
276 | clear_bit(irq - trig->subirq_base, trig->pool); | |
277 | mutex_unlock(&trig->pool_lock); | |
278 | } | |
1637db44 JC |
279 | |
280 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
281 | * may be needed if the pollfuncs do not include the data read for the | |
282 | * triggering device. | |
283 | * This is not currently handled. Alternative of not enabling trigger unless | |
284 | * the relevant function is in there may be the best option. | |
285 | */ | |
860c9c54 | 286 | /* Worth protecting against double additions? */ |
f11d59d8 LPC |
287 | int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
288 | struct iio_poll_func *pf) | |
1637db44 | 289 | { |
6eaf9f6a | 290 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
af3bac44 AS |
291 | bool notinuse = |
292 | bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
1637db44 | 293 | int ret = 0; |
51c060a0 | 294 | |
860c9c54 | 295 | /* Prevent the module from being removed whilst attached to a trigger */ |
6eaf9f6a | 296 | __module_get(iio_dev_opaque->driver_module); |
99543823 CDL |
297 | |
298 | /* Get irq number */ | |
51c060a0 | 299 | pf->irq = iio_trigger_get_irq(trig); |
be35d281 MO |
300 | if (pf->irq < 0) { |
301 | pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n", | |
302 | trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
99543823 | 303 | goto out_put_module; |
be35d281 | 304 | } |
99543823 CDL |
305 | |
306 | /* Request irq */ | |
51c060a0 JC |
307 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, |
308 | pf->type, pf->name, | |
309 | pf); | |
99543823 CDL |
310 | if (ret < 0) |
311 | goto out_put_irq; | |
5dd72ecb | 312 | |
99543823 | 313 | /* Enable trigger in driver */ |
04581681 | 314 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
d29f73db | 315 | ret = trig->ops->set_trigger_state(trig, true); |
4dc8f99d | 316 | if (ret) |
99543823 | 317 | goto out_free_irq; |
5dd72ecb | 318 | } |
d96d1337 | 319 | |
702a7b8e LW |
320 | /* |
321 | * Check if we just registered to our own trigger: we determine that | |
322 | * this is the case if the IIO device and the trigger device share the | |
323 | * same parent device. | |
324 | */ | |
517985eb | 325 | if (iio_validate_own_trigger(pf->indio_dev, trig)) |
702a7b8e LW |
326 | trig->attached_own_device = true; |
327 | ||
1637db44 | 328 | return ret; |
99543823 CDL |
329 | |
330 | out_free_irq: | |
331 | free_irq(pf->irq, pf); | |
332 | out_put_irq: | |
333 | iio_trigger_put_irq(trig, pf->irq); | |
334 | out_put_module: | |
6eaf9f6a | 335 | module_put(iio_dev_opaque->driver_module); |
99543823 | 336 | return ret; |
1637db44 | 337 | } |
1637db44 | 338 | |
f11d59d8 LPC |
339 | int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
340 | struct iio_poll_func *pf) | |
1637db44 | 341 | { |
6eaf9f6a | 342 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
af3bac44 AS |
343 | bool no_other_users = |
344 | bitmap_weight(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER) == 1; | |
51c060a0 | 345 | int ret = 0; |
af3bac44 | 346 | |
04581681 | 347 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
d29f73db | 348 | ret = trig->ops->set_trigger_state(trig, false); |
51c060a0 | 349 | if (ret) |
92825ff9 | 350 | return ret; |
1637db44 | 351 | } |
702a7b8e LW |
352 | if (pf->indio_dev->dev.parent == trig->dev.parent) |
353 | trig->attached_own_device = false; | |
51c060a0 JC |
354 | iio_trigger_put_irq(trig, pf->irq); |
355 | free_irq(pf->irq, pf); | |
6eaf9f6a | 356 | module_put(iio_dev_opaque->driver_module); |
1637db44 | 357 | |
1637db44 JC |
358 | return ret; |
359 | } | |
1637db44 | 360 | |
d96d1337 JC |
361 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
362 | { | |
363 | struct iio_poll_func *pf = p; | |
af3bac44 | 364 | |
bc2b7dab | 365 | pf->timestamp = iio_get_time_ns(pf->indio_dev); |
d96d1337 JC |
366 | return IRQ_WAKE_THREAD; |
367 | } | |
368 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
369 | ||
21b185f8 JC |
370 | struct iio_poll_func |
371 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
372 | irqreturn_t (*thread)(int irq, void *p), | |
373 | int type, | |
e65bc6ac | 374 | struct iio_dev *indio_dev, |
21b185f8 JC |
375 | const char *fmt, |
376 | ...) | |
377 | { | |
378 | va_list vargs; | |
379 | struct iio_poll_func *pf; | |
380 | ||
ef7cecee | 381 | pf = kmalloc(sizeof(*pf), GFP_KERNEL); |
295cc426 | 382 | if (!pf) |
21b185f8 JC |
383 | return NULL; |
384 | va_start(vargs, fmt); | |
385 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
386 | va_end(vargs); | |
387 | if (pf->name == NULL) { | |
388 | kfree(pf); | |
389 | return NULL; | |
390 | } | |
391 | pf->h = h; | |
392 | pf->thread = thread; | |
393 | pf->type = type; | |
e65bc6ac | 394 | pf->indio_dev = indio_dev; |
21b185f8 JC |
395 | |
396 | return pf; | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
399 | ||
400 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
401 | { | |
402 | kfree(pf->name); | |
403 | kfree(pf); | |
404 | } | |
405 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
406 | ||
1637db44 | 407 | /** |
9cf0b618 | 408 | * current_trigger_show() - trigger consumer sysfs query current trigger |
8e563b0d CO |
409 | * @dev: device associated with an industrial I/O device |
410 | * @attr: pointer to the device_attribute structure that | |
411 | * is being processed | |
412 | * @buf: buffer where the current trigger name will be printed into | |
1637db44 JC |
413 | * |
414 | * For trigger consumers the current_trigger interface allows the trigger | |
415 | * used by the device to be queried. | |
8e563b0d CO |
416 | * |
417 | * Return: a negative number on failure, the number of characters written | |
418 | * on success or 0 if no trigger is available | |
419 | */ | |
9cf0b618 JST |
420 | static ssize_t current_trigger_show(struct device *dev, |
421 | struct device_attribute *attr, char *buf) | |
1637db44 | 422 | { |
e53f5ac5 | 423 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 424 | |
f8c6f4e9 | 425 | if (indio_dev->trig) |
83ca56b6 | 426 | return sysfs_emit(buf, "%s\n", indio_dev->trig->name); |
cb6c89a0 | 427 | return 0; |
1637db44 JC |
428 | } |
429 | ||
430 | /** | |
9cf0b618 | 431 | * current_trigger_store() - trigger consumer sysfs set current trigger |
8e563b0d CO |
432 | * @dev: device associated with an industrial I/O device |
433 | * @attr: device attribute that is being processed | |
434 | * @buf: string buffer that holds the name of the trigger | |
435 | * @len: length of the trigger name held by buf | |
1637db44 JC |
436 | * |
437 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 438 | * used for this device to be specified at run time based on the trigger's |
1637db44 | 439 | * name. |
8e563b0d CO |
440 | * |
441 | * Return: negative error code on failure or length of the buffer | |
442 | * on success | |
443 | */ | |
9cf0b618 JST |
444 | static ssize_t current_trigger_store(struct device *dev, |
445 | struct device_attribute *attr, | |
446 | const char *buf, size_t len) | |
1637db44 | 447 | { |
e53f5ac5 | 448 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
3028e0c2 | 449 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
f8c6f4e9 | 450 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
451 | struct iio_trigger *trig; |
452 | int ret; | |
453 | ||
16afe125 | 454 | mutex_lock(&iio_dev_opaque->mlock); |
51570c9d | 455 | if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) { |
16afe125 | 456 | mutex_unlock(&iio_dev_opaque->mlock); |
1637db44 JC |
457 | return -EBUSY; |
458 | } | |
3028e0c2 | 459 | if (iio_dev_opaque->trig_readonly) { |
16afe125 | 460 | mutex_unlock(&iio_dev_opaque->mlock); |
c8cdf708 MR |
461 | return -EPERM; |
462 | } | |
16afe125 | 463 | mutex_unlock(&iio_dev_opaque->mlock); |
1637db44 | 464 | |
d5d24bcc AS |
465 | trig = iio_trigger_acquire_by_name(buf); |
466 | if (oldtrig == trig) { | |
467 | ret = len; | |
468 | goto out_trigger_put; | |
469 | } | |
43a4360e | 470 | |
f8c6f4e9 JC |
471 | if (trig && indio_dev->info->validate_trigger) { |
472 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e | 473 | if (ret) |
d5d24bcc | 474 | goto out_trigger_put; |
43a4360e MH |
475 | } |
476 | ||
04581681 | 477 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 478 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e | 479 | if (ret) |
d5d24bcc | 480 | goto out_trigger_put; |
43a4360e MH |
481 | } |
482 | ||
f8c6f4e9 | 483 | indio_dev->trig = trig; |
43a4360e | 484 | |
735ad074 VB |
485 | if (oldtrig) { |
486 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) | |
487 | iio_trigger_detach_poll_func(oldtrig, | |
488 | indio_dev->pollfunc_event); | |
7cbb7537 | 489 | iio_trigger_put(oldtrig); |
735ad074 VB |
490 | } |
491 | if (indio_dev->trig) { | |
735ad074 VB |
492 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
493 | iio_trigger_attach_poll_func(indio_dev->trig, | |
494 | indio_dev->pollfunc_event); | |
495 | } | |
1637db44 JC |
496 | |
497 | return len; | |
d5d24bcc AS |
498 | |
499 | out_trigger_put: | |
4eecbe81 MN |
500 | if (trig) |
501 | iio_trigger_put(trig); | |
d5d24bcc | 502 | return ret; |
1637db44 JC |
503 | } |
504 | ||
9cf0b618 | 505 | static DEVICE_ATTR_RW(current_trigger); |
1637db44 JC |
506 | |
507 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
508 | &dev_attr_current_trigger.attr, | |
509 | NULL, | |
510 | }; | |
511 | ||
512 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
513 | .name = "trigger", | |
514 | .attrs = iio_trigger_consumer_attrs, | |
515 | }; | |
516 | ||
517 | static void iio_trig_release(struct device *device) | |
518 | { | |
519 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
520 | int i; |
521 | ||
522 | if (trig->subirq_base) { | |
523 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
524 | irq_modify_status(trig->subirq_base + i, | |
525 | IRQ_NOAUTOEN, | |
526 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
527 | irq_set_chip(trig->subirq_base + i, | |
528 | NULL); | |
529 | irq_set_handler(trig->subirq_base + i, | |
530 | NULL); | |
531 | } | |
532 | ||
533 | irq_free_descs(trig->subirq_base, | |
534 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
535 | } | |
59c85e82 | 536 | kfree(trig->name); |
1637db44 | 537 | kfree(trig); |
1637db44 JC |
538 | } |
539 | ||
3bdafc49 | 540 | static const struct device_type iio_trig_type = { |
1637db44 | 541 | .release = iio_trig_release, |
f59c2576 | 542 | .groups = iio_trig_dev_groups, |
1637db44 JC |
543 | }; |
544 | ||
d96d1337 JC |
545 | static void iio_trig_subirqmask(struct irq_data *d) |
546 | { | |
547 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
af3bac44 AS |
548 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
549 | ||
d96d1337 JC |
550 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; |
551 | } | |
552 | ||
553 | static void iio_trig_subirqunmask(struct irq_data *d) | |
554 | { | |
555 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
af3bac44 AS |
556 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
557 | ||
d96d1337 JC |
558 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; |
559 | } | |
560 | ||
bc72d938 | 561 | static __printf(3, 0) |
995071d3 | 562 | struct iio_trigger *viio_trigger_alloc(struct device *parent, |
bc72d938 | 563 | struct module *this_mod, |
995071d3 GG |
564 | const char *fmt, |
565 | va_list vargs) | |
1637db44 JC |
566 | { |
567 | struct iio_trigger *trig; | |
2c99f1a0 DC |
568 | int i; |
569 | ||
ef7cecee | 570 | trig = kzalloc(sizeof(*trig), GFP_KERNEL); |
2c99f1a0 DC |
571 | if (!trig) |
572 | return NULL; | |
d536321d | 573 | |
995071d3 | 574 | trig->dev.parent = parent; |
2c99f1a0 DC |
575 | trig->dev.type = &iio_trig_type; |
576 | trig->dev.bus = &iio_bus_type; | |
577 | device_initialize(&trig->dev); | |
9020ef65 | 578 | INIT_WORK(&trig->reenable_work, iio_reenable_work_fn); |
2c99f1a0 DC |
579 | |
580 | mutex_init(&trig->pool_lock); | |
581 | trig->subirq_base = irq_alloc_descs(-1, 0, | |
582 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
583 | 0); | |
584 | if (trig->subirq_base < 0) | |
585 | goto free_trig; | |
586 | ||
587 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
588 | if (trig->name == NULL) | |
589 | goto free_descs; | |
590 | ||
4a080694 DR |
591 | INIT_LIST_HEAD(&trig->list); |
592 | ||
bc72d938 DR |
593 | trig->owner = this_mod; |
594 | ||
2c99f1a0 DC |
595 | trig->subirq_chip.name = trig->name; |
596 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
597 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
598 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
599 | irq_set_chip(trig->subirq_base + i, &trig->subirq_chip); | |
600 | irq_set_handler(trig->subirq_base + i, &handle_simple_irq); | |
601 | irq_modify_status(trig->subirq_base + i, | |
602 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); | |
1637db44 | 603 | } |
d536321d JA |
604 | |
605 | return trig; | |
2c99f1a0 DC |
606 | |
607 | free_descs: | |
608 | irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
609 | free_trig: | |
610 | kfree(trig); | |
611 | return NULL; | |
d536321d JA |
612 | } |
613 | ||
995071d3 | 614 | /** |
bc72d938 | 615 | * __iio_trigger_alloc - Allocate a trigger |
995071d3 | 616 | * @parent: Device to allocate iio_trigger for |
bc72d938 | 617 | * @this_mod: module allocating the trigger |
995071d3 GG |
618 | * @fmt: trigger name format. If it includes format |
619 | * specifiers, the additional arguments following | |
620 | * format are formatted and inserted in the resulting | |
621 | * string replacing their respective specifiers. | |
622 | * RETURNS: | |
623 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
624 | */ | |
bc72d938 DR |
625 | struct iio_trigger *__iio_trigger_alloc(struct device *parent, |
626 | struct module *this_mod, | |
627 | const char *fmt, ...) | |
d536321d JA |
628 | { |
629 | struct iio_trigger *trig; | |
630 | va_list vargs; | |
631 | ||
632 | va_start(vargs, fmt); | |
bc72d938 | 633 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
d536321d JA |
634 | va_end(vargs); |
635 | ||
1637db44 JC |
636 | return trig; |
637 | } | |
bc72d938 | 638 | EXPORT_SYMBOL(__iio_trigger_alloc); |
1637db44 | 639 | |
7cbb7537 | 640 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
641 | { |
642 | if (trig) | |
643 | put_device(&trig->dev); | |
644 | } | |
7cbb7537 | 645 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 646 | |
d536321d JA |
647 | static void devm_iio_trigger_release(struct device *dev, void *res) |
648 | { | |
649 | iio_trigger_free(*(struct iio_trigger **)res); | |
650 | } | |
651 | ||
a7e57dce | 652 | /** |
bc72d938 | 653 | * __devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() |
995071d3 GG |
654 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is |
655 | * automatically freed on driver detach. | |
656 | * @parent: Device to allocate iio_trigger for | |
bc72d938 | 657 | * @this_mod: module allocating the trigger |
a7e57dce SK |
658 | * @fmt: trigger name format. If it includes format |
659 | * specifiers, the additional arguments following | |
660 | * format are formatted and inserted in the resulting | |
661 | * string replacing their respective specifiers. | |
662 | * | |
a7e57dce | 663 | * |
a7e57dce SK |
664 | * RETURNS: |
665 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
666 | */ | |
bc72d938 DR |
667 | struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, |
668 | struct module *this_mod, | |
669 | const char *fmt, ...) | |
d536321d JA |
670 | { |
671 | struct iio_trigger **ptr, *trig; | |
672 | va_list vargs; | |
673 | ||
674 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
675 | GFP_KERNEL); | |
676 | if (!ptr) | |
677 | return NULL; | |
678 | ||
679 | /* use raw alloc_dr for kmalloc caller tracing */ | |
680 | va_start(vargs, fmt); | |
bc72d938 | 681 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
d536321d JA |
682 | va_end(vargs); |
683 | if (trig) { | |
684 | *ptr = trig; | |
995071d3 | 685 | devres_add(parent, ptr); |
d536321d JA |
686 | } else { |
687 | devres_free(ptr); | |
688 | } | |
689 | ||
690 | return trig; | |
691 | } | |
bc72d938 | 692 | EXPORT_SYMBOL_GPL(__devm_iio_trigger_alloc); |
d536321d | 693 | |
171a70af | 694 | static void devm_iio_trigger_unreg(void *trigger_info) |
9083325f | 695 | { |
171a70af | 696 | iio_trigger_unregister(trigger_info); |
9083325f GB |
697 | } |
698 | ||
699 | /** | |
bc72d938 | 700 | * devm_iio_trigger_register - Resource-managed iio_trigger_register() |
9083325f GB |
701 | * @dev: device this trigger was allocated for |
702 | * @trig_info: trigger to register | |
703 | * | |
704 | * Managed iio_trigger_register(). The IIO trigger registered with this | |
705 | * function is automatically unregistered on driver detach. This function | |
706 | * calls iio_trigger_register() internally. Refer to that function for more | |
707 | * information. | |
708 | * | |
9083325f GB |
709 | * RETURNS: |
710 | * 0 on success, negative error number on failure. | |
711 | */ | |
bc72d938 DR |
712 | int devm_iio_trigger_register(struct device *dev, |
713 | struct iio_trigger *trig_info) | |
9083325f | 714 | { |
9083325f GB |
715 | int ret; |
716 | ||
bc72d938 | 717 | ret = iio_trigger_register(trig_info); |
171a70af YY |
718 | if (ret) |
719 | return ret; | |
9083325f | 720 | |
171a70af | 721 | return devm_add_action_or_reset(dev, devm_iio_trigger_unreg, trig_info); |
9083325f | 722 | } |
bc72d938 | 723 | EXPORT_SYMBOL_GPL(devm_iio_trigger_register); |
9083325f | 724 | |
702a7b8e LW |
725 | bool iio_trigger_using_own(struct iio_dev *indio_dev) |
726 | { | |
727 | return indio_dev->trig->attached_own_device; | |
728 | } | |
729 | EXPORT_SYMBOL(iio_trigger_using_own); | |
730 | ||
517985eb MV |
731 | /** |
732 | * iio_validate_own_trigger - Check if a trigger and IIO device belong to | |
733 | * the same device | |
734 | * @idev: the IIO device to check | |
735 | * @trig: the IIO trigger to check | |
736 | * | |
737 | * This function can be used as the validate_trigger callback for triggers that | |
738 | * can only be attached to their own device. | |
739 | * | |
740 | * Return: 0 if both the trigger and the IIO device belong to the same | |
741 | * device, -EINVAL otherwise. | |
742 | */ | |
743 | int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig) | |
744 | { | |
745 | if (idev->dev.parent != trig->dev.parent) | |
746 | return -EINVAL; | |
747 | return 0; | |
748 | } | |
749 | EXPORT_SYMBOL_GPL(iio_validate_own_trigger); | |
750 | ||
43ece27e LPC |
751 | /** |
752 | * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to | |
753 | * the same device | |
754 | * @trig: The IIO trigger to check | |
755 | * @indio_dev: the IIO device to check | |
756 | * | |
757 | * This function can be used as the validate_device callback for triggers that | |
758 | * can only be attached to their own device. | |
759 | * | |
760 | * Return: 0 if both the trigger and the IIO device belong to the same | |
761 | * device, -EINVAL otherwise. | |
762 | */ | |
763 | int iio_trigger_validate_own_device(struct iio_trigger *trig, | |
af3bac44 | 764 | struct iio_dev *indio_dev) |
43ece27e LPC |
765 | { |
766 | if (indio_dev->dev.parent != trig->dev.parent) | |
767 | return -EINVAL; | |
768 | return 0; | |
769 | } | |
770 | EXPORT_SYMBOL(iio_trigger_validate_own_device); | |
771 | ||
e64506bf | 772 | int iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 773 | { |
32f17172 AA |
774 | return iio_device_register_sysfs_group(indio_dev, |
775 | &iio_trigger_consumer_attr_group); | |
1637db44 | 776 | } |
1637db44 | 777 | |
f8c6f4e9 | 778 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 779 | { |
860c9c54 | 780 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 781 | if (indio_dev->trig) |
7cbb7537 | 782 | iio_trigger_put(indio_dev->trig); |
1637db44 | 783 | } |