1 // SPDX-License-Identifier: GPL-2.0-only 2 /* The industrial I/O core in kernel channel mapping 3 * 4 * Copyright (c) 2011 Jonathan Cameron 5 */ 6 #include <linux/cleanup.h> 7 #include <linux/err.h> 8 #include <linux/export.h> 9 #include <linux/minmax.h> 10 #include <linux/mm.h> 11 #include <linux/mutex.h> 12 #include <linux/property.h> 13 #include <linux/slab.h> 14 #include <linux/units.h> 15 16 #include <linux/iio/iio.h> 17 #include <linux/iio/iio-opaque.h> 18 #include "iio_core.h" 19 #include <linux/iio/machine.h> 20 #include <linux/iio/driver.h> 21 #include <linux/iio/consumer.h> 22 23 struct iio_map_internal { 24 struct iio_dev *indio_dev; 25 const struct iio_map *map; 26 struct list_head l; 27 }; 28 29 static LIST_HEAD(iio_map_list); 30 static DEFINE_MUTEX(iio_map_list_lock); 31 32 static int iio_map_array_unregister_locked(struct iio_dev *indio_dev) 33 { 34 int ret = -ENODEV; 35 struct iio_map_internal *mapi, *next; 36 37 list_for_each_entry_safe(mapi, next, &iio_map_list, l) { 38 if (indio_dev == mapi->indio_dev) { 39 list_del(&mapi->l); 40 kfree(mapi); 41 ret = 0; 42 } 43 } 44 return ret; 45 } 46 47 int iio_map_array_register(struct iio_dev *indio_dev, const struct iio_map *maps) 48 { 49 struct iio_map_internal *mapi; 50 int i = 0; 51 int ret; 52 53 if (!maps) 54 return 0; 55 56 guard(mutex)(&iio_map_list_lock); 57 while (maps[i].consumer_dev_name) { 58 mapi = kzalloc(sizeof(*mapi), GFP_KERNEL); 59 if (!mapi) { 60 ret = -ENOMEM; 61 goto error_ret; 62 } 63 mapi->map = &maps[i]; 64 mapi->indio_dev = indio_dev; 65 list_add_tail(&mapi->l, &iio_map_list); 66 i++; 67 } 68 69 return 0; 70 error_ret: 71 iio_map_array_unregister_locked(indio_dev); 72 return ret; 73 } 74 EXPORT_SYMBOL_GPL(iio_map_array_register); 75 76 /* 77 * Remove all map entries associated with the given iio device 78 */ 79 int iio_map_array_unregister(struct iio_dev *indio_dev) 80 { 81 guard(mutex)(&iio_map_list_lock); 82 return iio_map_array_unregister_locked(indio_dev); 83 } 84 EXPORT_SYMBOL_GPL(iio_map_array_unregister); 85 86 static void iio_map_array_unregister_cb(void *indio_dev) 87 { 88 iio_map_array_unregister(indio_dev); 89 } 90 91 int devm_iio_map_array_register(struct device *dev, struct iio_dev *indio_dev, 92 const struct iio_map *maps) 93 { 94 int ret; 95 96 ret = iio_map_array_register(indio_dev, maps); 97 if (ret) 98 return ret; 99 100 return devm_add_action_or_reset(dev, iio_map_array_unregister_cb, indio_dev); 101 } 102 EXPORT_SYMBOL_GPL(devm_iio_map_array_register); 103 104 static const struct iio_chan_spec 105 *iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name) 106 { 107 int i; 108 const struct iio_chan_spec *chan = NULL; 109 110 for (i = 0; i < indio_dev->num_channels; i++) 111 if (indio_dev->channels[i].datasheet_name && 112 strcmp(name, indio_dev->channels[i].datasheet_name) == 0) { 113 chan = &indio_dev->channels[i]; 114 break; 115 } 116 return chan; 117 } 118 119 /** 120 * __fwnode_iio_simple_xlate - translate iiospec to the IIO channel index 121 * @indio_dev: pointer to the iio_dev structure 122 * @iiospec: IIO specifier as found in the device tree 123 * 124 * This is simple translation function, suitable for the most 1:1 mapped 125 * channels in IIO chips. This function performs only one sanity check: 126 * whether IIO index is less than num_channels (that is specified in the 127 * iio_dev). 128 */ 129 static int __fwnode_iio_simple_xlate(struct iio_dev *indio_dev, 130 const struct fwnode_reference_args *iiospec) 131 { 132 if (!iiospec->nargs) 133 return 0; 134 135 if (iiospec->args[0] >= indio_dev->num_channels) { 136 dev_err(&indio_dev->dev, "invalid channel index %llu\n", 137 iiospec->args[0]); 138 return -EINVAL; 139 } 140 141 return iiospec->args[0]; 142 } 143 144 static int __fwnode_iio_channel_get(struct iio_channel *channel, 145 struct fwnode_handle *fwnode, int index) 146 { 147 struct fwnode_reference_args iiospec; 148 struct device *idev; 149 struct iio_dev *indio_dev; 150 int err; 151 152 err = fwnode_property_get_reference_args(fwnode, "io-channels", 153 "#io-channel-cells", 0, 154 index, &iiospec); 155 if (err) 156 return err; 157 158 idev = bus_find_device_by_fwnode(&iio_bus_type, iiospec.fwnode); 159 if (!idev) { 160 fwnode_handle_put(iiospec.fwnode); 161 return -EPROBE_DEFER; 162 } 163 164 indio_dev = dev_to_iio_dev(idev); 165 channel->indio_dev = indio_dev; 166 if (indio_dev->info->fwnode_xlate) 167 index = indio_dev->info->fwnode_xlate(indio_dev, &iiospec); 168 else 169 index = __fwnode_iio_simple_xlate(indio_dev, &iiospec); 170 fwnode_handle_put(iiospec.fwnode); 171 if (index < 0) 172 goto err_put; 173 channel->channel = &indio_dev->channels[index]; 174 175 return 0; 176 177 err_put: 178 iio_device_put(indio_dev); 179 return index; 180 } 181 182 static struct iio_channel *fwnode_iio_channel_get(struct fwnode_handle *fwnode, 183 int index) 184 { 185 int err; 186 187 if (index < 0) 188 return ERR_PTR(-EINVAL); 189 190 struct iio_channel *channel __free(kfree) = 191 kzalloc(sizeof(*channel), GFP_KERNEL); 192 if (!channel) 193 return ERR_PTR(-ENOMEM); 194 195 err = __fwnode_iio_channel_get(channel, fwnode, index); 196 if (err) 197 return ERR_PTR(err); 198 199 return_ptr(channel); 200 } 201 202 static struct iio_channel * 203 __fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode, const char *name) 204 { 205 struct iio_channel *chan; 206 int index = 0; 207 208 /* 209 * For named iio channels, first look up the name in the 210 * "io-channel-names" property. If it cannot be found, the 211 * index will be an error code, and fwnode_iio_channel_get() 212 * will fail. 213 */ 214 if (name) 215 index = fwnode_property_match_string(fwnode, "io-channel-names", 216 name); 217 218 chan = fwnode_iio_channel_get(fwnode, index); 219 if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) 220 return chan; 221 if (name) { 222 if (index >= 0) { 223 pr_err("ERROR: could not get IIO channel %pfw:%s(%i)\n", 224 fwnode, name, index); 225 /* 226 * In this case, we found 'name' in 'io-channel-names' 227 * but somehow we still fail so that we should not proceed 228 * with any other lookup. Hence, explicitly return -EINVAL 229 * (maybe not the better error code) so that the caller 230 * won't do a system lookup. 231 */ 232 return ERR_PTR(-EINVAL); 233 } 234 /* 235 * If index < 0, then fwnode_property_get_reference_args() fails 236 * with -EINVAL or -ENOENT (ACPI case) which is expected. We 237 * should not proceed if we get any other error. 238 */ 239 if (PTR_ERR(chan) != -EINVAL && PTR_ERR(chan) != -ENOENT) 240 return chan; 241 } else if (PTR_ERR(chan) != -ENOENT) { 242 /* 243 * if !name, then we should only proceed the lookup if 244 * fwnode_property_get_reference_args() returns -ENOENT. 245 */ 246 return chan; 247 } 248 249 /* so we continue the lookup */ 250 return ERR_PTR(-ENODEV); 251 } 252 253 struct iio_channel *fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode, 254 const char *name) 255 { 256 struct fwnode_handle *parent; 257 struct iio_channel *chan; 258 259 /* Walk up the tree of devices looking for a matching iio channel */ 260 chan = __fwnode_iio_channel_get_by_name(fwnode, name); 261 if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) 262 return chan; 263 264 /* 265 * No matching IIO channel found on this node. 266 * If the parent node has a "io-channel-ranges" property, 267 * then we can try one of its channels. 268 */ 269 fwnode_for_each_parent_node(fwnode, parent) { 270 if (!fwnode_property_present(parent, "io-channel-ranges")) { 271 fwnode_handle_put(parent); 272 return ERR_PTR(-ENODEV); 273 } 274 275 chan = __fwnode_iio_channel_get_by_name(parent, name); 276 if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) { 277 fwnode_handle_put(parent); 278 return chan; 279 } 280 } 281 282 return ERR_PTR(-ENODEV); 283 } 284 EXPORT_SYMBOL_GPL(fwnode_iio_channel_get_by_name); 285 286 static struct iio_channel *fwnode_iio_channel_get_all(struct device *dev) 287 { 288 struct fwnode_handle *fwnode = dev_fwnode(dev); 289 int i, mapind, nummaps = 0; 290 int ret; 291 292 do { 293 ret = fwnode_property_get_reference_args(fwnode, "io-channels", 294 "#io-channel-cells", 0, 295 nummaps, NULL); 296 if (ret < 0) 297 break; 298 } while (++nummaps); 299 300 if (nummaps == 0) 301 return ERR_PTR(-ENODEV); 302 303 /* NULL terminated array to save passing size */ 304 struct iio_channel *chans __free(kfree) = 305 kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); 306 if (!chans) 307 return ERR_PTR(-ENOMEM); 308 309 /* Search for FW matches */ 310 for (mapind = 0; mapind < nummaps; mapind++) { 311 ret = __fwnode_iio_channel_get(&chans[mapind], fwnode, mapind); 312 if (ret) 313 goto error_free_chans; 314 } 315 return_ptr(chans); 316 317 error_free_chans: 318 for (i = 0; i < mapind; i++) 319 iio_device_put(chans[i].indio_dev); 320 return ERR_PTR(ret); 321 } 322 323 static struct iio_channel *iio_channel_get_sys(const char *name, 324 const char *channel_name) 325 { 326 struct iio_map_internal *c_i = NULL, *c = NULL; 327 int err; 328 329 if (!(name || channel_name)) 330 return ERR_PTR(-ENODEV); 331 332 /* first find matching entry the channel map */ 333 scoped_guard(mutex, &iio_map_list_lock) { 334 list_for_each_entry(c_i, &iio_map_list, l) { 335 if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || 336 (channel_name && 337 strcmp(channel_name, c_i->map->consumer_channel) != 0)) 338 continue; 339 c = c_i; 340 iio_device_get(c->indio_dev); 341 break; 342 } 343 } 344 if (!c) 345 return ERR_PTR(-ENODEV); 346 347 struct iio_channel *channel __free(kfree) = 348 kzalloc(sizeof(*channel), GFP_KERNEL); 349 if (!channel) { 350 err = -ENOMEM; 351 goto error_no_mem; 352 } 353 354 channel->indio_dev = c->indio_dev; 355 356 if (c->map->adc_channel_label) { 357 channel->channel = 358 iio_chan_spec_from_name(channel->indio_dev, 359 c->map->adc_channel_label); 360 361 if (!channel->channel) { 362 err = -EINVAL; 363 goto error_no_mem; 364 } 365 } 366 367 return_ptr(channel); 368 369 error_no_mem: 370 iio_device_put(c->indio_dev); 371 return ERR_PTR(err); 372 } 373 374 struct iio_channel *iio_channel_get(struct device *dev, 375 const char *channel_name) 376 { 377 const char *name = dev ? dev_name(dev) : NULL; 378 struct iio_channel *channel; 379 380 if (dev) { 381 channel = fwnode_iio_channel_get_by_name(dev_fwnode(dev), 382 channel_name); 383 if (!IS_ERR(channel) || PTR_ERR(channel) != -ENODEV) 384 return channel; 385 } 386 387 return iio_channel_get_sys(name, channel_name); 388 } 389 EXPORT_SYMBOL_GPL(iio_channel_get); 390 391 void iio_channel_release(struct iio_channel *channel) 392 { 393 if (!channel) 394 return; 395 iio_device_put(channel->indio_dev); 396 kfree(channel); 397 } 398 EXPORT_SYMBOL_GPL(iio_channel_release); 399 400 static void devm_iio_channel_free(void *iio_channel) 401 { 402 iio_channel_release(iio_channel); 403 } 404 405 struct iio_channel *devm_iio_channel_get(struct device *dev, 406 const char *channel_name) 407 { 408 struct iio_channel *channel; 409 int ret; 410 411 channel = iio_channel_get(dev, channel_name); 412 if (IS_ERR(channel)) 413 return channel; 414 415 ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel); 416 if (ret) 417 return ERR_PTR(ret); 418 419 return channel; 420 } 421 EXPORT_SYMBOL_GPL(devm_iio_channel_get); 422 423 struct iio_channel *devm_fwnode_iio_channel_get_by_name(struct device *dev, 424 struct fwnode_handle *fwnode, 425 const char *channel_name) 426 { 427 struct iio_channel *channel; 428 int ret; 429 430 channel = fwnode_iio_channel_get_by_name(fwnode, channel_name); 431 if (IS_ERR(channel)) 432 return channel; 433 434 ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel); 435 if (ret) 436 return ERR_PTR(ret); 437 438 return channel; 439 } 440 EXPORT_SYMBOL_GPL(devm_fwnode_iio_channel_get_by_name); 441 442 struct iio_channel *iio_channel_get_all(struct device *dev) 443 { 444 const char *name; 445 struct iio_map_internal *c = NULL; 446 struct iio_channel *fw_chans; 447 int nummaps = 0; 448 int mapind = 0; 449 int i, ret; 450 451 if (!dev) 452 return ERR_PTR(-EINVAL); 453 454 fw_chans = fwnode_iio_channel_get_all(dev); 455 /* 456 * We only want to carry on if the error is -ENODEV. Anything else 457 * should be reported up the stack. 458 */ 459 if (!IS_ERR(fw_chans) || PTR_ERR(fw_chans) != -ENODEV) 460 return fw_chans; 461 462 name = dev_name(dev); 463 464 guard(mutex)(&iio_map_list_lock); 465 /* first count the matching maps */ 466 list_for_each_entry(c, &iio_map_list, l) 467 if (name && strcmp(name, c->map->consumer_dev_name) != 0) 468 continue; 469 else 470 nummaps++; 471 472 if (nummaps == 0) 473 return ERR_PTR(-ENODEV); 474 475 /* NULL terminated array to save passing size */ 476 struct iio_channel *chans __free(kfree) = 477 kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); 478 if (!chans) 479 return ERR_PTR(-ENOMEM); 480 481 /* for each map fill in the chans element */ 482 list_for_each_entry(c, &iio_map_list, l) { 483 if (name && strcmp(name, c->map->consumer_dev_name) != 0) 484 continue; 485 chans[mapind].indio_dev = c->indio_dev; 486 chans[mapind].data = c->map->consumer_data; 487 chans[mapind].channel = 488 iio_chan_spec_from_name(chans[mapind].indio_dev, 489 c->map->adc_channel_label); 490 if (!chans[mapind].channel) { 491 ret = -EINVAL; 492 goto error_free_chans; 493 } 494 iio_device_get(chans[mapind].indio_dev); 495 mapind++; 496 } 497 if (mapind == 0) { 498 ret = -ENODEV; 499 goto error_free_chans; 500 } 501 502 return_ptr(chans); 503 504 error_free_chans: 505 for (i = 0; i < mapind; i++) 506 iio_device_put(chans[i].indio_dev); 507 return ERR_PTR(ret); 508 } 509 EXPORT_SYMBOL_GPL(iio_channel_get_all); 510 511 void iio_channel_release_all(struct iio_channel *channels) 512 { 513 struct iio_channel *chan = &channels[0]; 514 515 while (chan->indio_dev) { 516 iio_device_put(chan->indio_dev); 517 chan++; 518 } 519 kfree(channels); 520 } 521 EXPORT_SYMBOL_GPL(iio_channel_release_all); 522 523 static void devm_iio_channel_free_all(void *iio_channels) 524 { 525 iio_channel_release_all(iio_channels); 526 } 527 528 struct iio_channel *devm_iio_channel_get_all(struct device *dev) 529 { 530 struct iio_channel *channels; 531 int ret; 532 533 channels = iio_channel_get_all(dev); 534 if (IS_ERR(channels)) 535 return channels; 536 537 ret = devm_add_action_or_reset(dev, devm_iio_channel_free_all, 538 channels); 539 if (ret) 540 return ERR_PTR(ret); 541 542 return channels; 543 } 544 EXPORT_SYMBOL_GPL(devm_iio_channel_get_all); 545 546 static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, 547 enum iio_chan_info_enum info) 548 { 549 const struct iio_info *iio_info = chan->indio_dev->info; 550 int unused; 551 int vals[INDIO_MAX_RAW_ELEMENTS]; 552 int ret; 553 int val_len = 2; 554 555 if (!val2) 556 val2 = &unused; 557 558 if (!iio_channel_has_info(chan->channel, info)) 559 return -EINVAL; 560 561 if (iio_info->read_raw_multi) { 562 ret = iio_info->read_raw_multi(chan->indio_dev, 563 chan->channel, 564 INDIO_MAX_RAW_ELEMENTS, 565 vals, &val_len, info); 566 *val = vals[0]; 567 *val2 = vals[1]; 568 } else if (iio_info->read_raw) { 569 ret = iio_info->read_raw(chan->indio_dev, 570 chan->channel, val, val2, info); 571 } else { 572 return -EINVAL; 573 } 574 575 return ret; 576 } 577 578 int iio_read_channel_raw(struct iio_channel *chan, int *val) 579 { 580 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 581 582 guard(mutex)(&iio_dev_opaque->info_exist_lock); 583 if (!chan->indio_dev->info) 584 return -ENODEV; 585 586 return iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); 587 } 588 EXPORT_SYMBOL_GPL(iio_read_channel_raw); 589 590 int iio_read_channel_average_raw(struct iio_channel *chan, int *val) 591 { 592 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 593 594 guard(mutex)(&iio_dev_opaque->info_exist_lock); 595 if (!chan->indio_dev->info) 596 return -ENODEV; 597 598 return iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW); 599 } 600 EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); 601 602 int iio_multiply_value(int *result, s64 multiplier, 603 unsigned int type, int val, int val2) 604 { 605 s64 denominator; 606 607 switch (type) { 608 case IIO_VAL_INT: 609 *result = multiplier * val; 610 return IIO_VAL_INT; 611 case IIO_VAL_INT_PLUS_MICRO: 612 case IIO_VAL_INT_PLUS_NANO: 613 switch (type) { 614 case IIO_VAL_INT_PLUS_MICRO: 615 denominator = MICRO; 616 break; 617 case IIO_VAL_INT_PLUS_NANO: 618 denominator = NANO; 619 break; 620 } 621 *result = multiplier * abs(val); 622 *result += div_s64(multiplier * abs(val2), denominator); 623 if (val < 0 || val2 < 0) 624 *result *= -1; 625 return IIO_VAL_INT; 626 case IIO_VAL_FRACTIONAL: 627 *result = div_s64(multiplier * val, val2); 628 return IIO_VAL_INT; 629 case IIO_VAL_FRACTIONAL_LOG2: 630 *result = (multiplier * val) >> val2; 631 return IIO_VAL_INT; 632 default: 633 return -EINVAL; 634 } 635 } 636 EXPORT_SYMBOL_NS_GPL(iio_multiply_value, "IIO_UNIT_TEST"); 637 638 static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, 639 int raw, int *processed, 640 unsigned int scale) 641 { 642 int scale_type, scale_val, scale_val2; 643 int offset_type, offset_val, offset_val2; 644 s64 raw64 = raw; 645 int ret; 646 647 offset_type = iio_channel_read(chan, &offset_val, &offset_val2, 648 IIO_CHAN_INFO_OFFSET); 649 if (offset_type >= 0) { 650 switch (offset_type) { 651 case IIO_VAL_INT: 652 break; 653 case IIO_VAL_INT_PLUS_MICRO: 654 case IIO_VAL_INT_PLUS_NANO: 655 /* 656 * Both IIO_VAL_INT_PLUS_MICRO and IIO_VAL_INT_PLUS_NANO 657 * implicitely truncate the offset to it's integer form. 658 */ 659 break; 660 case IIO_VAL_FRACTIONAL: 661 offset_val /= offset_val2; 662 break; 663 case IIO_VAL_FRACTIONAL_LOG2: 664 offset_val >>= offset_val2; 665 break; 666 default: 667 return -EINVAL; 668 } 669 670 raw64 += offset_val; 671 } 672 673 scale_type = iio_channel_read(chan, &scale_val, &scale_val2, 674 IIO_CHAN_INFO_SCALE); 675 if (scale_type < 0) { 676 /* 677 * If no channel scaling is available apply consumer scale to 678 * raw value and return. 679 */ 680 *processed = raw64 * scale; 681 return 0; 682 } 683 684 ret = iio_multiply_value(processed, raw64 * scale, 685 scale_type, scale_val, scale_val2); 686 if (ret < 0) 687 return ret; 688 689 return 0; 690 } 691 692 int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, 693 int *processed, unsigned int scale) 694 { 695 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 696 697 guard(mutex)(&iio_dev_opaque->info_exist_lock); 698 if (!chan->indio_dev->info) 699 return -ENODEV; 700 701 return iio_convert_raw_to_processed_unlocked(chan, raw, processed, 702 scale); 703 } 704 EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); 705 706 int iio_read_channel_attribute(struct iio_channel *chan, int *val, int *val2, 707 enum iio_chan_info_enum attribute) 708 { 709 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 710 711 guard(mutex)(&iio_dev_opaque->info_exist_lock); 712 if (!chan->indio_dev->info) 713 return -ENODEV; 714 715 return iio_channel_read(chan, val, val2, attribute); 716 } 717 EXPORT_SYMBOL_GPL(iio_read_channel_attribute); 718 719 int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2) 720 { 721 return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_OFFSET); 722 } 723 EXPORT_SYMBOL_GPL(iio_read_channel_offset); 724 725 int iio_read_channel_processed_scale(struct iio_channel *chan, int *val, 726 unsigned int scale) 727 { 728 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 729 int ret, pval, pval2; 730 731 guard(mutex)(&iio_dev_opaque->info_exist_lock); 732 if (!chan->indio_dev->info) 733 return -ENODEV; 734 735 if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { 736 ret = iio_channel_read(chan, &pval, &pval2, 737 IIO_CHAN_INFO_PROCESSED); 738 if (ret < 0) 739 return ret; 740 741 return iio_multiply_value(val, scale, ret, pval, pval2); 742 } else { 743 ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); 744 if (ret < 0) 745 return ret; 746 747 return iio_convert_raw_to_processed_unlocked(chan, *val, val, 748 scale); 749 } 750 } 751 EXPORT_SYMBOL_GPL(iio_read_channel_processed_scale); 752 753 int iio_read_channel_processed(struct iio_channel *chan, int *val) 754 { 755 /* This is just a special case with scale factor 1 */ 756 return iio_read_channel_processed_scale(chan, val, 1); 757 } 758 EXPORT_SYMBOL_GPL(iio_read_channel_processed); 759 760 int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) 761 { 762 return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_SCALE); 763 } 764 EXPORT_SYMBOL_GPL(iio_read_channel_scale); 765 766 static int iio_channel_read_avail(struct iio_channel *chan, 767 const int **vals, int *type, int *length, 768 enum iio_chan_info_enum info) 769 { 770 const struct iio_info *iio_info = chan->indio_dev->info; 771 772 if (!iio_channel_has_available(chan->channel, info)) 773 return -EINVAL; 774 775 if (iio_info->read_avail) 776 return iio_info->read_avail(chan->indio_dev, chan->channel, 777 vals, type, length, info); 778 return -EINVAL; 779 } 780 781 int iio_read_avail_channel_attribute(struct iio_channel *chan, 782 const int **vals, int *type, int *length, 783 enum iio_chan_info_enum attribute) 784 { 785 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 786 787 guard(mutex)(&iio_dev_opaque->info_exist_lock); 788 if (!chan->indio_dev->info) 789 return -ENODEV; 790 791 return iio_channel_read_avail(chan, vals, type, length, attribute); 792 } 793 EXPORT_SYMBOL_GPL(iio_read_avail_channel_attribute); 794 795 int iio_read_avail_channel_raw(struct iio_channel *chan, 796 const int **vals, int *length) 797 { 798 int ret; 799 int type; 800 801 ret = iio_read_avail_channel_attribute(chan, vals, &type, length, 802 IIO_CHAN_INFO_RAW); 803 804 if (ret >= 0 && type != IIO_VAL_INT) 805 /* raw values are assumed to be IIO_VAL_INT */ 806 ret = -EINVAL; 807 808 return ret; 809 } 810 EXPORT_SYMBOL_GPL(iio_read_avail_channel_raw); 811 812 static int iio_channel_read_max(struct iio_channel *chan, 813 int *val, int *val2, int *type, 814 enum iio_chan_info_enum info) 815 { 816 const int *vals; 817 int length; 818 int ret; 819 820 ret = iio_channel_read_avail(chan, &vals, type, &length, info); 821 if (ret < 0) 822 return ret; 823 824 switch (ret) { 825 case IIO_AVAIL_RANGE: 826 switch (*type) { 827 case IIO_VAL_INT: 828 *val = vals[2]; 829 break; 830 default: 831 *val = vals[4]; 832 if (val2) 833 *val2 = vals[5]; 834 } 835 return 0; 836 837 case IIO_AVAIL_LIST: 838 if (length <= 0) 839 return -EINVAL; 840 switch (*type) { 841 case IIO_VAL_INT: 842 *val = max_array(vals, length); 843 break; 844 default: 845 /* TODO: learn about max for other iio values */ 846 return -EINVAL; 847 } 848 return 0; 849 850 default: 851 return -EINVAL; 852 } 853 } 854 855 int iio_read_max_channel_raw(struct iio_channel *chan, int *val) 856 { 857 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 858 int type; 859 860 guard(mutex)(&iio_dev_opaque->info_exist_lock); 861 if (!chan->indio_dev->info) 862 return -ENODEV; 863 864 return iio_channel_read_max(chan, val, NULL, &type, IIO_CHAN_INFO_RAW); 865 } 866 EXPORT_SYMBOL_GPL(iio_read_max_channel_raw); 867 868 static int iio_channel_read_min(struct iio_channel *chan, 869 int *val, int *val2, int *type, 870 enum iio_chan_info_enum info) 871 { 872 const int *vals; 873 int length; 874 int ret; 875 876 ret = iio_channel_read_avail(chan, &vals, type, &length, info); 877 if (ret < 0) 878 return ret; 879 880 switch (ret) { 881 case IIO_AVAIL_RANGE: 882 switch (*type) { 883 case IIO_VAL_INT: 884 *val = vals[0]; 885 break; 886 default: 887 *val = vals[0]; 888 if (val2) 889 *val2 = vals[1]; 890 } 891 return 0; 892 893 case IIO_AVAIL_LIST: 894 if (length <= 0) 895 return -EINVAL; 896 switch (*type) { 897 case IIO_VAL_INT: 898 *val = min_array(vals, length); 899 break; 900 default: 901 /* TODO: learn about min for other iio values */ 902 return -EINVAL; 903 } 904 return 0; 905 906 default: 907 return -EINVAL; 908 } 909 } 910 911 int iio_read_min_channel_raw(struct iio_channel *chan, int *val) 912 { 913 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 914 int type; 915 916 guard(mutex)(&iio_dev_opaque->info_exist_lock); 917 if (!chan->indio_dev->info) 918 return -ENODEV; 919 920 return iio_channel_read_min(chan, val, NULL, &type, IIO_CHAN_INFO_RAW); 921 } 922 EXPORT_SYMBOL_GPL(iio_read_min_channel_raw); 923 924 int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) 925 { 926 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 927 928 guard(mutex)(&iio_dev_opaque->info_exist_lock); 929 if (!chan->indio_dev->info) 930 return -ENODEV; 931 932 *type = chan->channel->type; 933 934 return 0; 935 } 936 EXPORT_SYMBOL_GPL(iio_get_channel_type); 937 938 static int iio_channel_write(struct iio_channel *chan, int val, int val2, 939 enum iio_chan_info_enum info) 940 { 941 const struct iio_info *iio_info = chan->indio_dev->info; 942 943 if (iio_info->write_raw) 944 return iio_info->write_raw(chan->indio_dev, 945 chan->channel, val, val2, info); 946 return -EINVAL; 947 } 948 949 int iio_write_channel_attribute(struct iio_channel *chan, int val, int val2, 950 enum iio_chan_info_enum attribute) 951 { 952 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); 953 954 guard(mutex)(&iio_dev_opaque->info_exist_lock); 955 if (!chan->indio_dev->info) 956 return -ENODEV; 957 958 return iio_channel_write(chan, val, val2, attribute); 959 } 960 EXPORT_SYMBOL_GPL(iio_write_channel_attribute); 961 962 int iio_write_channel_raw(struct iio_channel *chan, int val) 963 { 964 return iio_write_channel_attribute(chan, val, 0, IIO_CHAN_INFO_RAW); 965 } 966 EXPORT_SYMBOL_GPL(iio_write_channel_raw); 967 968 unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan) 969 { 970 const struct iio_chan_spec_ext_info *ext_info; 971 unsigned int i = 0; 972 973 if (!chan->channel->ext_info) 974 return i; 975 976 for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++) 977 ++i; 978 979 return i; 980 } 981 EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count); 982 983 static const struct iio_chan_spec_ext_info * 984 iio_lookup_ext_info(const struct iio_channel *chan, const char *attr) 985 { 986 const struct iio_chan_spec_ext_info *ext_info; 987 988 if (!chan->channel->ext_info) 989 return NULL; 990 991 for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) { 992 if (!strcmp(attr, ext_info->name)) 993 return ext_info; 994 } 995 996 return NULL; 997 } 998 999 ssize_t iio_read_channel_ext_info(struct iio_channel *chan, 1000 const char *attr, char *buf) 1001 { 1002 const struct iio_chan_spec_ext_info *ext_info; 1003 1004 if (!buf || offset_in_page(buf)) { 1005 pr_err("iio: invalid ext_info read buffer\n"); 1006 return -EINVAL; 1007 } 1008 1009 ext_info = iio_lookup_ext_info(chan, attr); 1010 if (!ext_info) 1011 return -EINVAL; 1012 1013 return ext_info->read(chan->indio_dev, ext_info->private, 1014 chan->channel, buf); 1015 } 1016 EXPORT_SYMBOL_GPL(iio_read_channel_ext_info); 1017 1018 ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, 1019 const char *buf, size_t len) 1020 { 1021 const struct iio_chan_spec_ext_info *ext_info; 1022 1023 ext_info = iio_lookup_ext_info(chan, attr); 1024 if (!ext_info) 1025 return -EINVAL; 1026 1027 return ext_info->write(chan->indio_dev, ext_info->private, 1028 chan->channel, buf, len); 1029 } 1030 EXPORT_SYMBOL_GPL(iio_write_channel_ext_info); 1031 1032 ssize_t iio_read_channel_label(struct iio_channel *chan, char *buf) 1033 { 1034 if (!buf || offset_in_page(buf)) { 1035 pr_err("iio: invalid label read buffer\n"); 1036 return -EINVAL; 1037 } 1038 1039 return do_iio_read_channel_label(chan->indio_dev, chan->channel, buf); 1040 } 1041 EXPORT_SYMBOL_GPL(iio_read_channel_label); 1042