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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 | ||
095be2d5 | 7 | #include <linux/cleanup.h> |
1637db44 | 8 | #include <linux/kernel.h> |
1637db44 JC |
9 | #include <linux/idr.h> |
10 | #include <linux/err.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/list.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1637db44 | 15 | |
06458e27 | 16 | #include <linux/iio/iio.h> |
6eaf9f6a | 17 | #include <linux/iio/iio-opaque.h> |
06458e27 | 18 | #include <linux/iio/trigger.h> |
df9c1c42 | 19 | #include "iio_core.h" |
6aea1c36 | 20 | #include "iio_core_trigger.h" |
06458e27 | 21 | #include <linux/iio/trigger_consumer.h> |
1637db44 JC |
22 | |
23 | /* RFC - Question of approach | |
24 | * Make the common case (single sensor single trigger) | |
25 | * simple by starting trigger capture from when first sensors | |
26 | * is added. | |
27 | * | |
28 | * Complex simultaneous start requires use of 'hold' functionality | |
29 | * of the trigger. (not implemented) | |
30 | * | |
31 | * Any other suggestions? | |
32 | */ | |
33 | ||
47c24fdd | 34 | static DEFINE_IDA(iio_trigger_ida); |
1637db44 JC |
35 | |
36 | /* Single list of all available triggers */ | |
37 | static LIST_HEAD(iio_trigger_list); | |
38 | static DEFINE_MUTEX(iio_trigger_list_lock); | |
39 | ||
59c85e82 | 40 | /** |
9cf0b618 | 41 | * name_show() - retrieve useful identifying name |
8e563b0d CO |
42 | * @dev: device associated with the iio_trigger |
43 | * @attr: pointer to the device_attribute structure that is | |
44 | * being processed | |
45 | * @buf: buffer to print the name into | |
46 | * | |
47 | * Return: a negative number on failure or the number of written | |
48 | * characters on success. | |
49 | */ | |
9cf0b618 JST |
50 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
51 | char *buf) | |
59c85e82 | 52 | { |
971ff1db | 53 | struct iio_trigger *trig = to_iio_trigger(dev); |
9d9ec8d0 | 54 | |
83ca56b6 | 55 | return sysfs_emit(buf, "%s\n", trig->name); |
59c85e82 JC |
56 | } |
57 | ||
9cf0b618 | 58 | static DEVICE_ATTR_RO(name); |
59c85e82 | 59 | |
6d459aa0 LPC |
60 | static struct attribute *iio_trig_dev_attrs[] = { |
61 | &dev_attr_name.attr, | |
62 | NULL, | |
63 | }; | |
f59c2576 | 64 | ATTRIBUTE_GROUPS(iio_trig_dev); |
1637db44 | 65 | |
3b8e73ec CDL |
66 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name); |
67 | ||
bc72d938 | 68 | int iio_trigger_register(struct iio_trigger *trig_info) |
1637db44 JC |
69 | { |
70 | int ret; | |
71 | ||
319dbcd8 | 72 | trig_info->id = ida_alloc(&iio_trigger_ida, GFP_KERNEL); |
92825ff9 HK |
73 | if (trig_info->id < 0) |
74 | return trig_info->id; | |
75 | ||
1637db44 | 76 | /* Set the name used for the sysfs directory etc */ |
ebb9493c | 77 | dev_set_name(&trig_info->dev, "trigger%d", trig_info->id); |
1637db44 JC |
78 | |
79 | ret = device_add(&trig_info->dev); | |
80 | if (ret) | |
81 | goto error_unregister_id; | |
82 | ||
1637db44 | 83 | /* Add to list of available triggers held by the IIO core */ |
095be2d5 NS |
84 | scoped_guard(mutex, &iio_trigger_list_lock) { |
85 | if (__iio_trigger_find_by_name(trig_info->name)) { | |
86 | pr_err("Duplicate trigger name '%s'\n", trig_info->name); | |
87 | ret = -EEXIST; | |
88 | goto error_device_del; | |
89 | } | |
90 | list_add_tail(&trig_info->list, &iio_trigger_list); | |
3b8e73ec | 91 | } |
1637db44 JC |
92 | |
93 | return 0; | |
94 | ||
3b8e73ec | 95 | error_device_del: |
3b8e73ec | 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 | { | |
095be2d5 NS |
105 | scoped_guard(mutex, &iio_trigger_list_lock) |
106 | list_del(&trig_info->list); | |
1637db44 | 107 | |
319dbcd8 | 108 | ida_free(&iio_trigger_ida, trig_info->id); |
1637db44 | 109 | /* Possible issue in here */ |
8bade406 | 110 | device_del(&trig_info->dev); |
1637db44 JC |
111 | } |
112 | EXPORT_SYMBOL(iio_trigger_unregister); | |
113 | ||
c8cdf708 MR |
114 | int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig) |
115 | { | |
3028e0c2 JC |
116 | struct iio_dev_opaque *iio_dev_opaque; |
117 | ||
c8cdf708 MR |
118 | if (!indio_dev || !trig) |
119 | return -EINVAL; | |
120 | ||
3028e0c2 | 121 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
095be2d5 | 122 | guard(mutex)(&iio_dev_opaque->mlock); |
3028e0c2 | 123 | WARN_ON(iio_dev_opaque->trig_readonly); |
c8cdf708 MR |
124 | |
125 | indio_dev->trig = iio_trigger_get(trig); | |
3028e0c2 | 126 | iio_dev_opaque->trig_readonly = true; |
c8cdf708 MR |
127 | |
128 | return 0; | |
129 | } | |
130 | EXPORT_SYMBOL(iio_trigger_set_immutable); | |
131 | ||
3b8e73ec CDL |
132 | /* Search for trigger by name, assuming iio_trigger_list_lock held */ |
133 | static struct iio_trigger *__iio_trigger_find_by_name(const char *name) | |
134 | { | |
135 | struct iio_trigger *iter; | |
136 | ||
137 | list_for_each_entry(iter, &iio_trigger_list, list) | |
138 | if (!strcmp(iter->name, name)) | |
139 | return iter; | |
140 | ||
141 | return NULL; | |
142 | } | |
143 | ||
d5d24bcc | 144 | static struct iio_trigger *iio_trigger_acquire_by_name(const char *name) |
1637db44 | 145 | { |
095be2d5 | 146 | struct iio_trigger *iter; |
7c327857 | 147 | |
095be2d5 | 148 | guard(mutex)(&iio_trigger_list_lock); |
f6517f22 | 149 | list_for_each_entry(iter, &iio_trigger_list, list) |
095be2d5 NS |
150 | if (sysfs_streq(iter->name, name)) |
151 | return iio_trigger_get(iter); | |
1637db44 | 152 | |
095be2d5 | 153 | return NULL; |
5f87404d | 154 | } |
1637db44 | 155 | |
9020ef65 JC |
156 | static void iio_reenable_work_fn(struct work_struct *work) |
157 | { | |
158 | struct iio_trigger *trig = container_of(work, struct iio_trigger, | |
159 | reenable_work); | |
160 | ||
161 | /* | |
162 | * This 'might' occur after the trigger state is set to disabled - | |
163 | * in that case the driver should skip reenabling. | |
164 | */ | |
165 | trig->ops->reenable(trig); | |
166 | } | |
167 | ||
168 | /* | |
169 | * In general, reenable callbacks may need to sleep and this path is | |
170 | * not performance sensitive, so just queue up a work item | |
171 | * to reneable the trigger for us. | |
172 | * | |
173 | * Races that can cause this. | |
174 | * 1) A handler occurs entirely in interrupt context so the counter | |
175 | * the final decrement is still in this interrupt. | |
176 | * 2) The trigger has been removed, but one last interrupt gets through. | |
177 | * | |
178 | * For (1) we must call reenable, but not in atomic context. | |
179 | * For (2) it should be safe to call reenanble, if drivers never blindly | |
180 | * reenable after state is off. | |
181 | */ | |
182 | static void iio_trigger_notify_done_atomic(struct iio_trigger *trig) | |
183 | { | |
184 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && | |
185 | trig->ops->reenable) | |
186 | schedule_work(&trig->reenable_work); | |
187 | } | |
188 | ||
4ad682e0 MD |
189 | /** |
190 | * iio_trigger_poll() - Call the IRQ trigger handler of the consumers | |
191 | * @trig: trigger which occurred | |
192 | * | |
193 | * This function should only be called from a hard IRQ context. | |
194 | */ | |
398fd22b | 195 | void iio_trigger_poll(struct iio_trigger *trig) |
1637db44 | 196 | { |
d96d1337 | 197 | int i; |
a1a8e1dc LPC |
198 | |
199 | if (!atomic_read(&trig->use_count)) { | |
200 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
201 | ||
202 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
203 | if (trig->subirqs[i].enabled) | |
d96d1337 | 204 | generic_handle_irq(trig->subirq_base + i); |
a1a8e1dc | 205 | else |
9020ef65 | 206 | iio_trigger_notify_done_atomic(trig); |
a1a8e1dc LPC |
207 | } |
208 | } | |
1637db44 JC |
209 | } |
210 | EXPORT_SYMBOL(iio_trigger_poll); | |
8384d957 JC |
211 | |
212 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) | |
213 | { | |
398fd22b | 214 | iio_trigger_poll(private); |
8384d957 JC |
215 | return IRQ_HANDLED; |
216 | } | |
217 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); | |
1637db44 | 218 | |
f700e55e MD |
219 | /** |
220 | * iio_trigger_poll_nested() - Call the threaded trigger handler of the | |
221 | * consumers | |
222 | * @trig: trigger which occurred | |
223 | * | |
224 | * This function should only be called from a kernel thread context. | |
225 | */ | |
226 | void iio_trigger_poll_nested(struct iio_trigger *trig) | |
1f785681 JC |
227 | { |
228 | int i; | |
a1a8e1dc LPC |
229 | |
230 | if (!atomic_read(&trig->use_count)) { | |
231 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
232 | ||
233 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
234 | if (trig->subirqs[i].enabled) | |
1f785681 | 235 | handle_nested_irq(trig->subirq_base + i); |
a1a8e1dc LPC |
236 | else |
237 | iio_trigger_notify_done(trig); | |
238 | } | |
239 | } | |
1f785681 | 240 | } |
f700e55e | 241 | EXPORT_SYMBOL(iio_trigger_poll_nested); |
1f785681 | 242 | |
1637db44 JC |
243 | void iio_trigger_notify_done(struct iio_trigger *trig) |
244 | { | |
04581681 | 245 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
eca8523a JC |
246 | trig->ops->reenable) |
247 | trig->ops->reenable(trig); | |
1637db44 JC |
248 | } |
249 | EXPORT_SYMBOL(iio_trigger_notify_done); | |
250 | ||
1637db44 | 251 | /* Trigger Consumer related functions */ |
208b813c JC |
252 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
253 | { | |
254 | int ret; | |
af3bac44 | 255 | |
095be2d5 NS |
256 | scoped_guard(mutex, &trig->pool_lock) { |
257 | ret = bitmap_find_free_region(trig->pool, | |
258 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
259 | ilog2(1)); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | } | |
208b813c | 263 | |
095be2d5 | 264 | return ret + trig->subirq_base; |
208b813c JC |
265 | } |
266 | ||
267 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) | |
268 | { | |
095be2d5 | 269 | guard(mutex)(&trig->pool_lock); |
208b813c | 270 | clear_bit(irq - trig->subirq_base, trig->pool); |
208b813c | 271 | } |
1637db44 JC |
272 | |
273 | /* Complexity in here. With certain triggers (datardy) an acknowledgement | |
274 | * may be needed if the pollfuncs do not include the data read for the | |
275 | * triggering device. | |
276 | * This is not currently handled. Alternative of not enabling trigger unless | |
277 | * the relevant function is in there may be the best option. | |
278 | */ | |
860c9c54 | 279 | /* Worth protecting against double additions? */ |
f11d59d8 LPC |
280 | int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
281 | struct iio_poll_func *pf) | |
1637db44 | 282 | { |
6eaf9f6a | 283 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
af3bac44 AS |
284 | bool notinuse = |
285 | bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
1637db44 | 286 | int ret = 0; |
51c060a0 | 287 | |
860c9c54 | 288 | /* Prevent the module from being removed whilst attached to a trigger */ |
6eaf9f6a | 289 | __module_get(iio_dev_opaque->driver_module); |
99543823 CDL |
290 | |
291 | /* Get irq number */ | |
51c060a0 | 292 | pf->irq = iio_trigger_get_irq(trig); |
be35d281 MO |
293 | if (pf->irq < 0) { |
294 | pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n", | |
295 | trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
99543823 | 296 | goto out_put_module; |
be35d281 | 297 | } |
99543823 CDL |
298 | |
299 | /* Request irq */ | |
51c060a0 JC |
300 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, |
301 | pf->type, pf->name, | |
302 | pf); | |
99543823 CDL |
303 | if (ret < 0) |
304 | goto out_put_irq; | |
5dd72ecb | 305 | |
99543823 | 306 | /* Enable trigger in driver */ |
04581681 | 307 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
d29f73db | 308 | ret = trig->ops->set_trigger_state(trig, true); |
4dc8f99d | 309 | if (ret) |
99543823 | 310 | goto out_free_irq; |
5dd72ecb | 311 | } |
d96d1337 | 312 | |
702a7b8e LW |
313 | /* |
314 | * Check if we just registered to our own trigger: we determine that | |
315 | * this is the case if the IIO device and the trigger device share the | |
316 | * same parent device. | |
317 | */ | |
517985eb | 318 | if (iio_validate_own_trigger(pf->indio_dev, trig)) |
702a7b8e LW |
319 | trig->attached_own_device = true; |
320 | ||
1637db44 | 321 | return ret; |
99543823 CDL |
322 | |
323 | out_free_irq: | |
324 | free_irq(pf->irq, pf); | |
325 | out_put_irq: | |
326 | iio_trigger_put_irq(trig, pf->irq); | |
327 | out_put_module: | |
6eaf9f6a | 328 | module_put(iio_dev_opaque->driver_module); |
99543823 | 329 | return ret; |
1637db44 | 330 | } |
1637db44 | 331 | |
f11d59d8 LPC |
332 | int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
333 | struct iio_poll_func *pf) | |
1637db44 | 334 | { |
6eaf9f6a | 335 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(pf->indio_dev); |
af3bac44 AS |
336 | bool no_other_users = |
337 | bitmap_weight(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER) == 1; | |
51c060a0 | 338 | int ret = 0; |
af3bac44 | 339 | |
04581681 | 340 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
d29f73db | 341 | ret = trig->ops->set_trigger_state(trig, false); |
51c060a0 | 342 | if (ret) |
92825ff9 | 343 | return ret; |
1637db44 | 344 | } |
702a7b8e LW |
345 | if (pf->indio_dev->dev.parent == trig->dev.parent) |
346 | trig->attached_own_device = false; | |
51c060a0 JC |
347 | iio_trigger_put_irq(trig, pf->irq); |
348 | free_irq(pf->irq, pf); | |
6eaf9f6a | 349 | module_put(iio_dev_opaque->driver_module); |
1637db44 | 350 | |
1637db44 JC |
351 | return ret; |
352 | } | |
1637db44 | 353 | |
d96d1337 JC |
354 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
355 | { | |
356 | struct iio_poll_func *pf = p; | |
af3bac44 | 357 | |
bc2b7dab | 358 | pf->timestamp = iio_get_time_ns(pf->indio_dev); |
d96d1337 JC |
359 | return IRQ_WAKE_THREAD; |
360 | } | |
361 | EXPORT_SYMBOL(iio_pollfunc_store_time); | |
362 | ||
21b185f8 JC |
363 | struct iio_poll_func |
364 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), | |
365 | irqreturn_t (*thread)(int irq, void *p), | |
366 | int type, | |
e65bc6ac | 367 | struct iio_dev *indio_dev, |
21b185f8 JC |
368 | const char *fmt, |
369 | ...) | |
370 | { | |
371 | va_list vargs; | |
372 | struct iio_poll_func *pf; | |
373 | ||
ef7cecee | 374 | pf = kmalloc(sizeof(*pf), GFP_KERNEL); |
295cc426 | 375 | if (!pf) |
21b185f8 JC |
376 | return NULL; |
377 | va_start(vargs, fmt); | |
378 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
379 | va_end(vargs); | |
380 | if (pf->name == NULL) { | |
381 | kfree(pf); | |
382 | return NULL; | |
383 | } | |
384 | pf->h = h; | |
385 | pf->thread = thread; | |
386 | pf->type = type; | |
e65bc6ac | 387 | pf->indio_dev = indio_dev; |
21b185f8 JC |
388 | |
389 | return pf; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); | |
392 | ||
393 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) | |
394 | { | |
395 | kfree(pf->name); | |
396 | kfree(pf); | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); | |
399 | ||
1637db44 | 400 | /** |
9cf0b618 | 401 | * current_trigger_show() - trigger consumer sysfs query current trigger |
8e563b0d CO |
402 | * @dev: device associated with an industrial I/O device |
403 | * @attr: pointer to the device_attribute structure that | |
404 | * is being processed | |
405 | * @buf: buffer where the current trigger name will be printed into | |
1637db44 JC |
406 | * |
407 | * For trigger consumers the current_trigger interface allows the trigger | |
408 | * used by the device to be queried. | |
8e563b0d CO |
409 | * |
410 | * Return: a negative number on failure, the number of characters written | |
411 | * on success or 0 if no trigger is available | |
412 | */ | |
9cf0b618 JST |
413 | static ssize_t current_trigger_show(struct device *dev, |
414 | struct device_attribute *attr, char *buf) | |
1637db44 | 415 | { |
e53f5ac5 | 416 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
cb6c89a0 | 417 | |
f8c6f4e9 | 418 | if (indio_dev->trig) |
83ca56b6 | 419 | return sysfs_emit(buf, "%s\n", indio_dev->trig->name); |
cb6c89a0 | 420 | return 0; |
1637db44 JC |
421 | } |
422 | ||
423 | /** | |
9cf0b618 | 424 | * current_trigger_store() - trigger consumer sysfs set current trigger |
8e563b0d CO |
425 | * @dev: device associated with an industrial I/O device |
426 | * @attr: device attribute that is being processed | |
427 | * @buf: string buffer that holds the name of the trigger | |
428 | * @len: length of the trigger name held by buf | |
1637db44 JC |
429 | * |
430 | * For trigger consumers the current_trigger interface allows the trigger | |
17666ef3 | 431 | * used for this device to be specified at run time based on the trigger's |
1637db44 | 432 | * name. |
8e563b0d CO |
433 | * |
434 | * Return: negative error code on failure or length of the buffer | |
435 | * on success | |
436 | */ | |
9cf0b618 JST |
437 | static ssize_t current_trigger_store(struct device *dev, |
438 | struct device_attribute *attr, | |
439 | const char *buf, size_t len) | |
1637db44 | 440 | { |
e53f5ac5 | 441 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
3028e0c2 | 442 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
f8c6f4e9 | 443 | struct iio_trigger *oldtrig = indio_dev->trig; |
43a4360e MH |
444 | struct iio_trigger *trig; |
445 | int ret; | |
446 | ||
095be2d5 NS |
447 | scoped_guard(mutex, &iio_dev_opaque->mlock) { |
448 | if (iio_dev_opaque->currentmode == INDIO_BUFFER_TRIGGERED) | |
449 | return -EBUSY; | |
450 | if (iio_dev_opaque->trig_readonly) | |
451 | return -EPERM; | |
c8cdf708 | 452 | } |
1637db44 | 453 | |
d5d24bcc AS |
454 | trig = iio_trigger_acquire_by_name(buf); |
455 | if (oldtrig == trig) { | |
456 | ret = len; | |
457 | goto out_trigger_put; | |
458 | } | |
43a4360e | 459 | |
f8c6f4e9 JC |
460 | if (trig && indio_dev->info->validate_trigger) { |
461 | ret = indio_dev->info->validate_trigger(indio_dev, trig); | |
43a4360e | 462 | if (ret) |
d5d24bcc | 463 | goto out_trigger_put; |
43a4360e MH |
464 | } |
465 | ||
04581681 | 466 | if (trig && trig->ops && trig->ops->validate_device) { |
f8c6f4e9 | 467 | ret = trig->ops->validate_device(trig, indio_dev); |
43a4360e | 468 | if (ret) |
d5d24bcc | 469 | goto out_trigger_put; |
43a4360e MH |
470 | } |
471 | ||
f8c6f4e9 | 472 | indio_dev->trig = trig; |
43a4360e | 473 | |
735ad074 VB |
474 | if (oldtrig) { |
475 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) | |
476 | iio_trigger_detach_poll_func(oldtrig, | |
477 | indio_dev->pollfunc_event); | |
7cbb7537 | 478 | iio_trigger_put(oldtrig); |
735ad074 VB |
479 | } |
480 | if (indio_dev->trig) { | |
735ad074 VB |
481 | if (indio_dev->modes & INDIO_EVENT_TRIGGERED) |
482 | iio_trigger_attach_poll_func(indio_dev->trig, | |
483 | indio_dev->pollfunc_event); | |
484 | } | |
1637db44 JC |
485 | |
486 | return len; | |
d5d24bcc AS |
487 | |
488 | out_trigger_put: | |
4eecbe81 MN |
489 | if (trig) |
490 | iio_trigger_put(trig); | |
d5d24bcc | 491 | return ret; |
1637db44 JC |
492 | } |
493 | ||
9cf0b618 | 494 | static DEVICE_ATTR_RW(current_trigger); |
1637db44 JC |
495 | |
496 | static struct attribute *iio_trigger_consumer_attrs[] = { | |
497 | &dev_attr_current_trigger.attr, | |
498 | NULL, | |
499 | }; | |
500 | ||
501 | static const struct attribute_group iio_trigger_consumer_attr_group = { | |
502 | .name = "trigger", | |
503 | .attrs = iio_trigger_consumer_attrs, | |
504 | }; | |
505 | ||
506 | static void iio_trig_release(struct device *device) | |
507 | { | |
508 | struct iio_trigger *trig = to_iio_trigger(device); | |
d96d1337 JC |
509 | int i; |
510 | ||
511 | if (trig->subirq_base) { | |
512 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
513 | irq_modify_status(trig->subirq_base + i, | |
514 | IRQ_NOAUTOEN, | |
515 | IRQ_NOREQUEST | IRQ_NOPROBE); | |
516 | irq_set_chip(trig->subirq_base + i, | |
517 | NULL); | |
518 | irq_set_handler(trig->subirq_base + i, | |
519 | NULL); | |
520 | } | |
521 | ||
522 | irq_free_descs(trig->subirq_base, | |
523 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
524 | } | |
59c85e82 | 525 | kfree(trig->name); |
1637db44 | 526 | kfree(trig); |
1637db44 JC |
527 | } |
528 | ||
3bdafc49 | 529 | static const struct device_type iio_trig_type = { |
1637db44 | 530 | .release = iio_trig_release, |
f59c2576 | 531 | .groups = iio_trig_dev_groups, |
1637db44 JC |
532 | }; |
533 | ||
d96d1337 JC |
534 | static void iio_trig_subirqmask(struct irq_data *d) |
535 | { | |
536 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
af3bac44 AS |
537 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
538 | ||
d96d1337 JC |
539 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; |
540 | } | |
541 | ||
542 | static void iio_trig_subirqunmask(struct irq_data *d) | |
543 | { | |
544 | struct irq_chip *chip = irq_data_get_irq_chip(d); | |
af3bac44 AS |
545 | struct iio_trigger *trig = container_of(chip, struct iio_trigger, subirq_chip); |
546 | ||
d96d1337 JC |
547 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; |
548 | } | |
549 | ||
bc72d938 | 550 | static __printf(3, 0) |
995071d3 | 551 | struct iio_trigger *viio_trigger_alloc(struct device *parent, |
bc72d938 | 552 | struct module *this_mod, |
995071d3 GG |
553 | const char *fmt, |
554 | va_list vargs) | |
1637db44 JC |
555 | { |
556 | struct iio_trigger *trig; | |
2c99f1a0 DC |
557 | int i; |
558 | ||
ef7cecee | 559 | trig = kzalloc(sizeof(*trig), GFP_KERNEL); |
2c99f1a0 DC |
560 | if (!trig) |
561 | return NULL; | |
d536321d | 562 | |
995071d3 | 563 | trig->dev.parent = parent; |
2c99f1a0 DC |
564 | trig->dev.type = &iio_trig_type; |
565 | trig->dev.bus = &iio_bus_type; | |
566 | device_initialize(&trig->dev); | |
9020ef65 | 567 | INIT_WORK(&trig->reenable_work, iio_reenable_work_fn); |
2c99f1a0 DC |
568 | |
569 | mutex_init(&trig->pool_lock); | |
570 | trig->subirq_base = irq_alloc_descs(-1, 0, | |
571 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, | |
572 | 0); | |
573 | if (trig->subirq_base < 0) | |
574 | goto free_trig; | |
575 | ||
576 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); | |
577 | if (trig->name == NULL) | |
578 | goto free_descs; | |
579 | ||
4a080694 DR |
580 | INIT_LIST_HEAD(&trig->list); |
581 | ||
bc72d938 DR |
582 | trig->owner = this_mod; |
583 | ||
2c99f1a0 DC |
584 | trig->subirq_chip.name = trig->name; |
585 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; | |
586 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; | |
587 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { | |
588 | irq_set_chip(trig->subirq_base + i, &trig->subirq_chip); | |
589 | irq_set_handler(trig->subirq_base + i, &handle_simple_irq); | |
590 | irq_modify_status(trig->subirq_base + i, | |
591 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); | |
1637db44 | 592 | } |
d536321d JA |
593 | |
594 | return trig; | |
2c99f1a0 DC |
595 | |
596 | free_descs: | |
597 | irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER); | |
598 | free_trig: | |
599 | kfree(trig); | |
600 | return NULL; | |
d536321d JA |
601 | } |
602 | ||
995071d3 | 603 | /** |
bc72d938 | 604 | * __iio_trigger_alloc - Allocate a trigger |
995071d3 | 605 | * @parent: Device to allocate iio_trigger for |
bc72d938 | 606 | * @this_mod: module allocating the trigger |
995071d3 GG |
607 | * @fmt: trigger name format. If it includes format |
608 | * specifiers, the additional arguments following | |
609 | * format are formatted and inserted in the resulting | |
610 | * string replacing their respective specifiers. | |
611 | * RETURNS: | |
612 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
613 | */ | |
bc72d938 DR |
614 | struct iio_trigger *__iio_trigger_alloc(struct device *parent, |
615 | struct module *this_mod, | |
616 | const char *fmt, ...) | |
d536321d JA |
617 | { |
618 | struct iio_trigger *trig; | |
619 | va_list vargs; | |
620 | ||
621 | va_start(vargs, fmt); | |
bc72d938 | 622 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
d536321d JA |
623 | va_end(vargs); |
624 | ||
1637db44 JC |
625 | return trig; |
626 | } | |
bc72d938 | 627 | EXPORT_SYMBOL(__iio_trigger_alloc); |
1637db44 | 628 | |
7cbb7537 | 629 | void iio_trigger_free(struct iio_trigger *trig) |
1637db44 JC |
630 | { |
631 | if (trig) | |
632 | put_device(&trig->dev); | |
633 | } | |
7cbb7537 | 634 | EXPORT_SYMBOL(iio_trigger_free); |
1637db44 | 635 | |
d536321d JA |
636 | static void devm_iio_trigger_release(struct device *dev, void *res) |
637 | { | |
638 | iio_trigger_free(*(struct iio_trigger **)res); | |
639 | } | |
640 | ||
a7e57dce | 641 | /** |
bc72d938 | 642 | * __devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc() |
995071d3 GG |
643 | * Managed iio_trigger_alloc. iio_trigger allocated with this function is |
644 | * automatically freed on driver detach. | |
645 | * @parent: Device to allocate iio_trigger for | |
bc72d938 | 646 | * @this_mod: module allocating the trigger |
a7e57dce SK |
647 | * @fmt: trigger name format. If it includes format |
648 | * specifiers, the additional arguments following | |
649 | * format are formatted and inserted in the resulting | |
650 | * string replacing their respective specifiers. | |
651 | * | |
a7e57dce | 652 | * |
a7e57dce SK |
653 | * RETURNS: |
654 | * Pointer to allocated iio_trigger on success, NULL on failure. | |
655 | */ | |
bc72d938 DR |
656 | struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, |
657 | struct module *this_mod, | |
658 | const char *fmt, ...) | |
d536321d JA |
659 | { |
660 | struct iio_trigger **ptr, *trig; | |
661 | va_list vargs; | |
662 | ||
663 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), | |
664 | GFP_KERNEL); | |
665 | if (!ptr) | |
666 | return NULL; | |
667 | ||
668 | /* use raw alloc_dr for kmalloc caller tracing */ | |
669 | va_start(vargs, fmt); | |
bc72d938 | 670 | trig = viio_trigger_alloc(parent, this_mod, fmt, vargs); |
d536321d JA |
671 | va_end(vargs); |
672 | if (trig) { | |
673 | *ptr = trig; | |
995071d3 | 674 | devres_add(parent, ptr); |
d536321d JA |
675 | } else { |
676 | devres_free(ptr); | |
677 | } | |
678 | ||
679 | return trig; | |
680 | } | |
bc72d938 | 681 | EXPORT_SYMBOL_GPL(__devm_iio_trigger_alloc); |
d536321d | 682 | |
171a70af | 683 | static void devm_iio_trigger_unreg(void *trigger_info) |
9083325f | 684 | { |
171a70af | 685 | iio_trigger_unregister(trigger_info); |
9083325f GB |
686 | } |
687 | ||
688 | /** | |
bc72d938 | 689 | * devm_iio_trigger_register - Resource-managed iio_trigger_register() |
9083325f GB |
690 | * @dev: device this trigger was allocated for |
691 | * @trig_info: trigger to register | |
692 | * | |
693 | * Managed iio_trigger_register(). The IIO trigger registered with this | |
694 | * function is automatically unregistered on driver detach. This function | |
695 | * calls iio_trigger_register() internally. Refer to that function for more | |
696 | * information. | |
697 | * | |
9083325f GB |
698 | * RETURNS: |
699 | * 0 on success, negative error number on failure. | |
700 | */ | |
bc72d938 DR |
701 | int devm_iio_trigger_register(struct device *dev, |
702 | struct iio_trigger *trig_info) | |
9083325f | 703 | { |
9083325f GB |
704 | int ret; |
705 | ||
bc72d938 | 706 | ret = iio_trigger_register(trig_info); |
171a70af YY |
707 | if (ret) |
708 | return ret; | |
9083325f | 709 | |
171a70af | 710 | return devm_add_action_or_reset(dev, devm_iio_trigger_unreg, trig_info); |
9083325f | 711 | } |
bc72d938 | 712 | EXPORT_SYMBOL_GPL(devm_iio_trigger_register); |
9083325f | 713 | |
702a7b8e LW |
714 | bool iio_trigger_using_own(struct iio_dev *indio_dev) |
715 | { | |
716 | return indio_dev->trig->attached_own_device; | |
717 | } | |
718 | EXPORT_SYMBOL(iio_trigger_using_own); | |
719 | ||
517985eb MV |
720 | /** |
721 | * iio_validate_own_trigger - Check if a trigger and IIO device belong to | |
722 | * the same device | |
723 | * @idev: the IIO device to check | |
724 | * @trig: the IIO trigger to check | |
725 | * | |
726 | * This function can be used as the validate_trigger callback for triggers that | |
727 | * can only be attached to their own device. | |
728 | * | |
729 | * Return: 0 if both the trigger and the IIO device belong to the same | |
730 | * device, -EINVAL otherwise. | |
731 | */ | |
732 | int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig) | |
733 | { | |
734 | if (idev->dev.parent != trig->dev.parent) | |
735 | return -EINVAL; | |
736 | return 0; | |
737 | } | |
738 | EXPORT_SYMBOL_GPL(iio_validate_own_trigger); | |
739 | ||
43ece27e LPC |
740 | /** |
741 | * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to | |
742 | * the same device | |
743 | * @trig: The IIO trigger to check | |
744 | * @indio_dev: the IIO device to check | |
745 | * | |
746 | * This function can be used as the validate_device callback for triggers that | |
747 | * can only be attached to their own device. | |
748 | * | |
749 | * Return: 0 if both the trigger and the IIO device belong to the same | |
750 | * device, -EINVAL otherwise. | |
751 | */ | |
752 | int iio_trigger_validate_own_device(struct iio_trigger *trig, | |
af3bac44 | 753 | struct iio_dev *indio_dev) |
43ece27e LPC |
754 | { |
755 | if (indio_dev->dev.parent != trig->dev.parent) | |
756 | return -EINVAL; | |
757 | return 0; | |
758 | } | |
759 | EXPORT_SYMBOL(iio_trigger_validate_own_device); | |
760 | ||
e64506bf | 761 | int iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 762 | { |
32f17172 AA |
763 | return iio_device_register_sysfs_group(indio_dev, |
764 | &iio_trigger_consumer_attr_group); | |
1637db44 | 765 | } |
1637db44 | 766 | |
f8c6f4e9 | 767 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
1637db44 | 768 | { |
860c9c54 | 769 | /* Clean up an associated but not attached trigger reference */ |
f8c6f4e9 | 770 | if (indio_dev->trig) |
7cbb7537 | 771 | iio_trigger_put(indio_dev->trig); |
1637db44 | 772 | } |