| 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> |
| 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> |
| 16 | #include <linux/slab.h> |
| 17 | |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/iio/trigger.h> |
| 20 | #include "iio_core.h" |
| 21 | #include "iio_core_trigger.h" |
| 22 | #include <linux/iio/trigger_consumer.h> |
| 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 | |
| 35 | static DEFINE_IDA(iio_trigger_ida); |
| 36 | |
| 37 | /* Single list of all available triggers */ |
| 38 | static LIST_HEAD(iio_trigger_list); |
| 39 | static DEFINE_MUTEX(iio_trigger_list_lock); |
| 40 | |
| 41 | /** |
| 42 | * iio_trigger_read_name() - retrieve useful identifying name |
| 43 | **/ |
| 44 | static ssize_t iio_trigger_read_name(struct device *dev, |
| 45 | struct device_attribute *attr, |
| 46 | char *buf) |
| 47 | { |
| 48 | struct iio_trigger *trig = to_iio_trigger(dev); |
| 49 | return sprintf(buf, "%s\n", trig->name); |
| 50 | } |
| 51 | |
| 52 | static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL); |
| 53 | |
| 54 | static struct attribute *iio_trig_dev_attrs[] = { |
| 55 | &dev_attr_name.attr, |
| 56 | NULL, |
| 57 | }; |
| 58 | |
| 59 | static struct attribute_group iio_trig_attr_group = { |
| 60 | .attrs = iio_trig_dev_attrs, |
| 61 | }; |
| 62 | |
| 63 | static const struct attribute_group *iio_trig_attr_groups[] = { |
| 64 | &iio_trig_attr_group, |
| 65 | NULL |
| 66 | }; |
| 67 | |
| 68 | int iio_trigger_register(struct iio_trigger *trig_info) |
| 69 | { |
| 70 | int ret; |
| 71 | |
| 72 | trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL); |
| 73 | if (trig_info->id < 0) { |
| 74 | ret = trig_info->id; |
| 75 | goto error_ret; |
| 76 | } |
| 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 | |
| 85 | /* Add to list of available triggers held by the IIO core */ |
| 86 | mutex_lock(&iio_trigger_list_lock); |
| 87 | list_add_tail(&trig_info->list, &iio_trigger_list); |
| 88 | mutex_unlock(&iio_trigger_list_lock); |
| 89 | |
| 90 | return 0; |
| 91 | |
| 92 | error_unregister_id: |
| 93 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
| 94 | error_ret: |
| 95 | return ret; |
| 96 | } |
| 97 | EXPORT_SYMBOL(iio_trigger_register); |
| 98 | |
| 99 | void iio_trigger_unregister(struct iio_trigger *trig_info) |
| 100 | { |
| 101 | mutex_lock(&iio_trigger_list_lock); |
| 102 | list_del(&trig_info->list); |
| 103 | mutex_unlock(&iio_trigger_list_lock); |
| 104 | |
| 105 | ida_simple_remove(&iio_trigger_ida, trig_info->id); |
| 106 | /* Possible issue in here */ |
| 107 | device_del(&trig_info->dev); |
| 108 | } |
| 109 | EXPORT_SYMBOL(iio_trigger_unregister); |
| 110 | |
| 111 | static struct iio_trigger *iio_trigger_find_by_name(const char *name, |
| 112 | size_t len) |
| 113 | { |
| 114 | struct iio_trigger *trig = NULL, *iter; |
| 115 | |
| 116 | mutex_lock(&iio_trigger_list_lock); |
| 117 | list_for_each_entry(iter, &iio_trigger_list, list) |
| 118 | if (sysfs_streq(iter->name, name)) { |
| 119 | trig = iter; |
| 120 | break; |
| 121 | } |
| 122 | mutex_unlock(&iio_trigger_list_lock); |
| 123 | |
| 124 | return trig; |
| 125 | } |
| 126 | |
| 127 | void iio_trigger_poll(struct iio_trigger *trig, s64 time) |
| 128 | { |
| 129 | int i; |
| 130 | |
| 131 | if (!atomic_read(&trig->use_count)) { |
| 132 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
| 133 | |
| 134 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
| 135 | if (trig->subirqs[i].enabled) |
| 136 | generic_handle_irq(trig->subirq_base + i); |
| 137 | else |
| 138 | iio_trigger_notify_done(trig); |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | EXPORT_SYMBOL(iio_trigger_poll); |
| 143 | |
| 144 | irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private) |
| 145 | { |
| 146 | iio_trigger_poll(private, iio_get_time_ns()); |
| 147 | return IRQ_HANDLED; |
| 148 | } |
| 149 | EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll); |
| 150 | |
| 151 | void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time) |
| 152 | { |
| 153 | int i; |
| 154 | |
| 155 | if (!atomic_read(&trig->use_count)) { |
| 156 | atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
| 157 | |
| 158 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
| 159 | if (trig->subirqs[i].enabled) |
| 160 | handle_nested_irq(trig->subirq_base + i); |
| 161 | else |
| 162 | iio_trigger_notify_done(trig); |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | EXPORT_SYMBOL(iio_trigger_poll_chained); |
| 167 | |
| 168 | void iio_trigger_notify_done(struct iio_trigger *trig) |
| 169 | { |
| 170 | if (atomic_dec_and_test(&trig->use_count) && trig->ops && |
| 171 | trig->ops->try_reenable) |
| 172 | if (trig->ops->try_reenable(trig)) |
| 173 | /* Missed an interrupt so launch new poll now */ |
| 174 | iio_trigger_poll(trig, 0); |
| 175 | } |
| 176 | EXPORT_SYMBOL(iio_trigger_notify_done); |
| 177 | |
| 178 | /* Trigger Consumer related functions */ |
| 179 | static int iio_trigger_get_irq(struct iio_trigger *trig) |
| 180 | { |
| 181 | int ret; |
| 182 | mutex_lock(&trig->pool_lock); |
| 183 | ret = bitmap_find_free_region(trig->pool, |
| 184 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, |
| 185 | ilog2(1)); |
| 186 | mutex_unlock(&trig->pool_lock); |
| 187 | if (ret >= 0) |
| 188 | ret += trig->subirq_base; |
| 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | static void iio_trigger_put_irq(struct iio_trigger *trig, int irq) |
| 194 | { |
| 195 | mutex_lock(&trig->pool_lock); |
| 196 | clear_bit(irq - trig->subirq_base, trig->pool); |
| 197 | mutex_unlock(&trig->pool_lock); |
| 198 | } |
| 199 | |
| 200 | /* Complexity in here. With certain triggers (datardy) an acknowledgement |
| 201 | * may be needed if the pollfuncs do not include the data read for the |
| 202 | * triggering device. |
| 203 | * This is not currently handled. Alternative of not enabling trigger unless |
| 204 | * the relevant function is in there may be the best option. |
| 205 | */ |
| 206 | /* Worth protecting against double additions? */ |
| 207 | static int iio_trigger_attach_poll_func(struct iio_trigger *trig, |
| 208 | struct iio_poll_func *pf) |
| 209 | { |
| 210 | int ret = 0; |
| 211 | bool notinuse |
| 212 | = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
| 213 | |
| 214 | /* Prevent the module from being removed whilst attached to a trigger */ |
| 215 | __module_get(pf->indio_dev->info->driver_module); |
| 216 | pf->irq = iio_trigger_get_irq(trig); |
| 217 | ret = request_threaded_irq(pf->irq, pf->h, pf->thread, |
| 218 | pf->type, pf->name, |
| 219 | pf); |
| 220 | if (ret < 0) { |
| 221 | module_put(pf->indio_dev->info->driver_module); |
| 222 | return ret; |
| 223 | } |
| 224 | |
| 225 | if (trig->ops && trig->ops->set_trigger_state && notinuse) { |
| 226 | ret = trig->ops->set_trigger_state(trig, true); |
| 227 | if (ret < 0) |
| 228 | module_put(pf->indio_dev->info->driver_module); |
| 229 | } |
| 230 | |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | static int iio_trigger_detach_poll_func(struct iio_trigger *trig, |
| 235 | struct iio_poll_func *pf) |
| 236 | { |
| 237 | int ret = 0; |
| 238 | bool no_other_users |
| 239 | = (bitmap_weight(trig->pool, |
| 240 | CONFIG_IIO_CONSUMERS_PER_TRIGGER) |
| 241 | == 1); |
| 242 | if (trig->ops && trig->ops->set_trigger_state && no_other_users) { |
| 243 | ret = trig->ops->set_trigger_state(trig, false); |
| 244 | if (ret) |
| 245 | goto error_ret; |
| 246 | } |
| 247 | iio_trigger_put_irq(trig, pf->irq); |
| 248 | free_irq(pf->irq, pf); |
| 249 | module_put(pf->indio_dev->info->driver_module); |
| 250 | |
| 251 | error_ret: |
| 252 | return ret; |
| 253 | } |
| 254 | |
| 255 | irqreturn_t iio_pollfunc_store_time(int irq, void *p) |
| 256 | { |
| 257 | struct iio_poll_func *pf = p; |
| 258 | pf->timestamp = iio_get_time_ns(); |
| 259 | return IRQ_WAKE_THREAD; |
| 260 | } |
| 261 | EXPORT_SYMBOL(iio_pollfunc_store_time); |
| 262 | |
| 263 | struct iio_poll_func |
| 264 | *iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p), |
| 265 | irqreturn_t (*thread)(int irq, void *p), |
| 266 | int type, |
| 267 | struct iio_dev *indio_dev, |
| 268 | const char *fmt, |
| 269 | ...) |
| 270 | { |
| 271 | va_list vargs; |
| 272 | struct iio_poll_func *pf; |
| 273 | |
| 274 | pf = kmalloc(sizeof *pf, GFP_KERNEL); |
| 275 | if (pf == NULL) |
| 276 | return NULL; |
| 277 | va_start(vargs, fmt); |
| 278 | pf->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
| 279 | va_end(vargs); |
| 280 | if (pf->name == NULL) { |
| 281 | kfree(pf); |
| 282 | return NULL; |
| 283 | } |
| 284 | pf->h = h; |
| 285 | pf->thread = thread; |
| 286 | pf->type = type; |
| 287 | pf->indio_dev = indio_dev; |
| 288 | |
| 289 | return pf; |
| 290 | } |
| 291 | EXPORT_SYMBOL_GPL(iio_alloc_pollfunc); |
| 292 | |
| 293 | void iio_dealloc_pollfunc(struct iio_poll_func *pf) |
| 294 | { |
| 295 | kfree(pf->name); |
| 296 | kfree(pf); |
| 297 | } |
| 298 | EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc); |
| 299 | |
| 300 | /** |
| 301 | * iio_trigger_read_current() - trigger consumer sysfs query current trigger |
| 302 | * |
| 303 | * For trigger consumers the current_trigger interface allows the trigger |
| 304 | * used by the device to be queried. |
| 305 | **/ |
| 306 | static ssize_t iio_trigger_read_current(struct device *dev, |
| 307 | struct device_attribute *attr, |
| 308 | char *buf) |
| 309 | { |
| 310 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 311 | |
| 312 | if (indio_dev->trig) |
| 313 | return sprintf(buf, "%s\n", indio_dev->trig->name); |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * iio_trigger_write_current() - trigger consumer sysfs set current trigger |
| 319 | * |
| 320 | * For trigger consumers the current_trigger interface allows the trigger |
| 321 | * used for this device to be specified at run time based on the triggers |
| 322 | * name. |
| 323 | **/ |
| 324 | static ssize_t iio_trigger_write_current(struct device *dev, |
| 325 | struct device_attribute *attr, |
| 326 | const char *buf, |
| 327 | size_t len) |
| 328 | { |
| 329 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 330 | struct iio_trigger *oldtrig = indio_dev->trig; |
| 331 | struct iio_trigger *trig; |
| 332 | int ret; |
| 333 | |
| 334 | mutex_lock(&indio_dev->mlock); |
| 335 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
| 336 | mutex_unlock(&indio_dev->mlock); |
| 337 | return -EBUSY; |
| 338 | } |
| 339 | mutex_unlock(&indio_dev->mlock); |
| 340 | |
| 341 | trig = iio_trigger_find_by_name(buf, len); |
| 342 | if (oldtrig == trig) |
| 343 | return len; |
| 344 | |
| 345 | if (trig && indio_dev->info->validate_trigger) { |
| 346 | ret = indio_dev->info->validate_trigger(indio_dev, trig); |
| 347 | if (ret) |
| 348 | return ret; |
| 349 | } |
| 350 | |
| 351 | if (trig && trig->ops && trig->ops->validate_device) { |
| 352 | ret = trig->ops->validate_device(trig, indio_dev); |
| 353 | if (ret) |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | indio_dev->trig = trig; |
| 358 | |
| 359 | if (oldtrig && indio_dev->trig != oldtrig) |
| 360 | iio_trigger_put(oldtrig); |
| 361 | if (indio_dev->trig) |
| 362 | iio_trigger_get(indio_dev->trig); |
| 363 | |
| 364 | return len; |
| 365 | } |
| 366 | |
| 367 | static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR, |
| 368 | iio_trigger_read_current, |
| 369 | iio_trigger_write_current); |
| 370 | |
| 371 | static struct attribute *iio_trigger_consumer_attrs[] = { |
| 372 | &dev_attr_current_trigger.attr, |
| 373 | NULL, |
| 374 | }; |
| 375 | |
| 376 | static const struct attribute_group iio_trigger_consumer_attr_group = { |
| 377 | .name = "trigger", |
| 378 | .attrs = iio_trigger_consumer_attrs, |
| 379 | }; |
| 380 | |
| 381 | static void iio_trig_release(struct device *device) |
| 382 | { |
| 383 | struct iio_trigger *trig = to_iio_trigger(device); |
| 384 | int i; |
| 385 | |
| 386 | if (trig->subirq_base) { |
| 387 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
| 388 | irq_modify_status(trig->subirq_base + i, |
| 389 | IRQ_NOAUTOEN, |
| 390 | IRQ_NOREQUEST | IRQ_NOPROBE); |
| 391 | irq_set_chip(trig->subirq_base + i, |
| 392 | NULL); |
| 393 | irq_set_handler(trig->subirq_base + i, |
| 394 | NULL); |
| 395 | } |
| 396 | |
| 397 | irq_free_descs(trig->subirq_base, |
| 398 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
| 399 | } |
| 400 | kfree(trig->name); |
| 401 | kfree(trig); |
| 402 | } |
| 403 | |
| 404 | static struct device_type iio_trig_type = { |
| 405 | .release = iio_trig_release, |
| 406 | .groups = iio_trig_attr_groups, |
| 407 | }; |
| 408 | |
| 409 | static void iio_trig_subirqmask(struct irq_data *d) |
| 410 | { |
| 411 | struct irq_chip *chip = irq_data_get_irq_chip(d); |
| 412 | struct iio_trigger *trig |
| 413 | = container_of(chip, |
| 414 | struct iio_trigger, subirq_chip); |
| 415 | trig->subirqs[d->irq - trig->subirq_base].enabled = false; |
| 416 | } |
| 417 | |
| 418 | static void iio_trig_subirqunmask(struct irq_data *d) |
| 419 | { |
| 420 | struct irq_chip *chip = irq_data_get_irq_chip(d); |
| 421 | struct iio_trigger *trig |
| 422 | = container_of(chip, |
| 423 | struct iio_trigger, subirq_chip); |
| 424 | trig->subirqs[d->irq - trig->subirq_base].enabled = true; |
| 425 | } |
| 426 | |
| 427 | static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs) |
| 428 | { |
| 429 | struct iio_trigger *trig; |
| 430 | trig = kzalloc(sizeof *trig, GFP_KERNEL); |
| 431 | if (trig) { |
| 432 | int i; |
| 433 | trig->dev.type = &iio_trig_type; |
| 434 | trig->dev.bus = &iio_bus_type; |
| 435 | device_initialize(&trig->dev); |
| 436 | |
| 437 | mutex_init(&trig->pool_lock); |
| 438 | trig->subirq_base |
| 439 | = irq_alloc_descs(-1, 0, |
| 440 | CONFIG_IIO_CONSUMERS_PER_TRIGGER, |
| 441 | 0); |
| 442 | if (trig->subirq_base < 0) { |
| 443 | kfree(trig); |
| 444 | return NULL; |
| 445 | } |
| 446 | |
| 447 | trig->name = kvasprintf(GFP_KERNEL, fmt, vargs); |
| 448 | if (trig->name == NULL) { |
| 449 | irq_free_descs(trig->subirq_base, |
| 450 | CONFIG_IIO_CONSUMERS_PER_TRIGGER); |
| 451 | kfree(trig); |
| 452 | return NULL; |
| 453 | } |
| 454 | trig->subirq_chip.name = trig->name; |
| 455 | trig->subirq_chip.irq_mask = &iio_trig_subirqmask; |
| 456 | trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask; |
| 457 | for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) { |
| 458 | irq_set_chip(trig->subirq_base + i, |
| 459 | &trig->subirq_chip); |
| 460 | irq_set_handler(trig->subirq_base + i, |
| 461 | &handle_simple_irq); |
| 462 | irq_modify_status(trig->subirq_base + i, |
| 463 | IRQ_NOREQUEST | IRQ_NOAUTOEN, |
| 464 | IRQ_NOPROBE); |
| 465 | } |
| 466 | get_device(&trig->dev); |
| 467 | } |
| 468 | |
| 469 | return trig; |
| 470 | } |
| 471 | |
| 472 | struct iio_trigger *iio_trigger_alloc(const char *fmt, ...) |
| 473 | { |
| 474 | struct iio_trigger *trig; |
| 475 | va_list vargs; |
| 476 | |
| 477 | va_start(vargs, fmt); |
| 478 | trig = viio_trigger_alloc(fmt, vargs); |
| 479 | va_end(vargs); |
| 480 | |
| 481 | return trig; |
| 482 | } |
| 483 | EXPORT_SYMBOL(iio_trigger_alloc); |
| 484 | |
| 485 | void iio_trigger_free(struct iio_trigger *trig) |
| 486 | { |
| 487 | if (trig) |
| 488 | put_device(&trig->dev); |
| 489 | } |
| 490 | EXPORT_SYMBOL(iio_trigger_free); |
| 491 | |
| 492 | static void devm_iio_trigger_release(struct device *dev, void *res) |
| 493 | { |
| 494 | iio_trigger_free(*(struct iio_trigger **)res); |
| 495 | } |
| 496 | |
| 497 | static int devm_iio_trigger_match(struct device *dev, void *res, void *data) |
| 498 | { |
| 499 | struct iio_trigger **r = res; |
| 500 | |
| 501 | if (!r || !*r) { |
| 502 | WARN_ON(!r || !*r); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | return *r == data; |
| 507 | } |
| 508 | |
| 509 | struct iio_trigger *devm_iio_trigger_alloc(struct device *dev, |
| 510 | const char *fmt, ...) |
| 511 | { |
| 512 | struct iio_trigger **ptr, *trig; |
| 513 | va_list vargs; |
| 514 | |
| 515 | ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr), |
| 516 | GFP_KERNEL); |
| 517 | if (!ptr) |
| 518 | return NULL; |
| 519 | |
| 520 | /* use raw alloc_dr for kmalloc caller tracing */ |
| 521 | va_start(vargs, fmt); |
| 522 | trig = viio_trigger_alloc(fmt, vargs); |
| 523 | va_end(vargs); |
| 524 | if (trig) { |
| 525 | *ptr = trig; |
| 526 | devres_add(dev, ptr); |
| 527 | } else { |
| 528 | devres_free(ptr); |
| 529 | } |
| 530 | |
| 531 | return trig; |
| 532 | } |
| 533 | EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc); |
| 534 | |
| 535 | void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig) |
| 536 | { |
| 537 | int rc; |
| 538 | |
| 539 | rc = devres_release(dev, devm_iio_trigger_release, |
| 540 | devm_iio_trigger_match, iio_trig); |
| 541 | WARN_ON(rc); |
| 542 | } |
| 543 | EXPORT_SYMBOL_GPL(devm_iio_trigger_free); |
| 544 | |
| 545 | void iio_device_register_trigger_consumer(struct iio_dev *indio_dev) |
| 546 | { |
| 547 | indio_dev->groups[indio_dev->groupcounter++] = |
| 548 | &iio_trigger_consumer_attr_group; |
| 549 | } |
| 550 | |
| 551 | void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) |
| 552 | { |
| 553 | /* Clean up an associated but not attached trigger reference */ |
| 554 | if (indio_dev->trig) |
| 555 | iio_trigger_put(indio_dev->trig); |
| 556 | } |
| 557 | |
| 558 | int iio_triggered_buffer_postenable(struct iio_dev *indio_dev) |
| 559 | { |
| 560 | return iio_trigger_attach_poll_func(indio_dev->trig, |
| 561 | indio_dev->pollfunc); |
| 562 | } |
| 563 | EXPORT_SYMBOL(iio_triggered_buffer_postenable); |
| 564 | |
| 565 | int iio_triggered_buffer_predisable(struct iio_dev *indio_dev) |
| 566 | { |
| 567 | return iio_trigger_detach_poll_func(indio_dev->trig, |
| 568 | indio_dev->pollfunc); |
| 569 | } |
| 570 | EXPORT_SYMBOL(iio_triggered_buffer_predisable); |