1 /* The industrial I/O core 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 * Based on elements of hwmon and input subsystems. 10 */ 11 12 #define pr_fmt(fmt) "iio-core: " fmt 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/idr.h> 17 #include <linux/kdev_t.h> 18 #include <linux/err.h> 19 #include <linux/device.h> 20 #include <linux/fs.h> 21 #include <linux/poll.h> 22 #include <linux/sched.h> 23 #include <linux/wait.h> 24 #include <linux/cdev.h> 25 #include <linux/slab.h> 26 #include <linux/anon_inodes.h> 27 #include <linux/debugfs.h> 28 #include <linux/iio/iio.h> 29 #include "iio_core.h" 30 #include "iio_core_trigger.h" 31 #include <linux/iio/sysfs.h> 32 #include <linux/iio/events.h> 33 #include <linux/iio/buffer.h> 34 35 /* IDA to assign each registered device a unique id */ 36 static DEFINE_IDA(iio_ida); 37 38 static dev_t iio_devt; 39 40 #define IIO_DEV_MAX 256 41 struct bus_type iio_bus_type = { 42 .name = "iio", 43 }; 44 EXPORT_SYMBOL(iio_bus_type); 45 46 static struct dentry *iio_debugfs_dentry; 47 48 static const char * const iio_direction[] = { 49 [0] = "in", 50 [1] = "out", 51 }; 52 53 static const char * const iio_chan_type_name_spec[] = { 54 [IIO_VOLTAGE] = "voltage", 55 [IIO_CURRENT] = "current", 56 [IIO_POWER] = "power", 57 [IIO_ACCEL] = "accel", 58 [IIO_ANGL_VEL] = "anglvel", 59 [IIO_MAGN] = "magn", 60 [IIO_LIGHT] = "illuminance", 61 [IIO_INTENSITY] = "intensity", 62 [IIO_PROXIMITY] = "proximity", 63 [IIO_TEMP] = "temp", 64 [IIO_INCLI] = "incli", 65 [IIO_ROT] = "rot", 66 [IIO_ANGL] = "angl", 67 [IIO_TIMESTAMP] = "timestamp", 68 [IIO_CAPACITANCE] = "capacitance", 69 [IIO_ALTVOLTAGE] = "altvoltage", 70 [IIO_CCT] = "cct", 71 [IIO_PRESSURE] = "pressure", 72 [IIO_HUMIDITYRELATIVE] = "humidityrelative", 73 [IIO_ACTIVITY] = "activity", 74 [IIO_STEPS] = "steps", 75 [IIO_ENERGY] = "energy", 76 [IIO_DISTANCE] = "distance", 77 [IIO_VELOCITY] = "velocity", 78 }; 79 80 static const char * const iio_modifier_names[] = { 81 [IIO_MOD_X] = "x", 82 [IIO_MOD_Y] = "y", 83 [IIO_MOD_Z] = "z", 84 [IIO_MOD_X_AND_Y] = "x&y", 85 [IIO_MOD_X_AND_Z] = "x&z", 86 [IIO_MOD_Y_AND_Z] = "y&z", 87 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 88 [IIO_MOD_X_OR_Y] = "x|y", 89 [IIO_MOD_X_OR_Z] = "x|z", 90 [IIO_MOD_Y_OR_Z] = "y|z", 91 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 92 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 93 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 94 [IIO_MOD_LIGHT_BOTH] = "both", 95 [IIO_MOD_LIGHT_IR] = "ir", 96 [IIO_MOD_LIGHT_CLEAR] = "clear", 97 [IIO_MOD_LIGHT_RED] = "red", 98 [IIO_MOD_LIGHT_GREEN] = "green", 99 [IIO_MOD_LIGHT_BLUE] = "blue", 100 [IIO_MOD_QUATERNION] = "quaternion", 101 [IIO_MOD_TEMP_AMBIENT] = "ambient", 102 [IIO_MOD_TEMP_OBJECT] = "object", 103 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 104 [IIO_MOD_NORTH_TRUE] = "from_north_true", 105 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 106 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 107 [IIO_MOD_RUNNING] = "running", 108 [IIO_MOD_JOGGING] = "jogging", 109 [IIO_MOD_WALKING] = "walking", 110 [IIO_MOD_STILL] = "still", 111 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 112 [IIO_MOD_I] = "i", 113 [IIO_MOD_Q] = "q", 114 }; 115 116 /* relies on pairs of these shared then separate */ 117 static const char * const iio_chan_info_postfix[] = { 118 [IIO_CHAN_INFO_RAW] = "raw", 119 [IIO_CHAN_INFO_PROCESSED] = "input", 120 [IIO_CHAN_INFO_SCALE] = "scale", 121 [IIO_CHAN_INFO_OFFSET] = "offset", 122 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", 123 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", 124 [IIO_CHAN_INFO_PEAK] = "peak_raw", 125 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", 126 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", 127 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", 128 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] 129 = "filter_low_pass_3db_frequency", 130 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] 131 = "filter_high_pass_3db_frequency", 132 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", 133 [IIO_CHAN_INFO_FREQUENCY] = "frequency", 134 [IIO_CHAN_INFO_PHASE] = "phase", 135 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", 136 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", 137 [IIO_CHAN_INFO_INT_TIME] = "integration_time", 138 [IIO_CHAN_INFO_ENABLE] = "en", 139 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", 140 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", 141 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", 142 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", 143 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", 144 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", 145 }; 146 147 /** 148 * iio_find_channel_from_si() - get channel from its scan index 149 * @indio_dev: device 150 * @si: scan index to match 151 */ 152 const struct iio_chan_spec 153 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) 154 { 155 int i; 156 157 for (i = 0; i < indio_dev->num_channels; i++) 158 if (indio_dev->channels[i].scan_index == si) 159 return &indio_dev->channels[i]; 160 return NULL; 161 } 162 163 /* This turns up an awful lot */ 164 ssize_t iio_read_const_attr(struct device *dev, 165 struct device_attribute *attr, 166 char *buf) 167 { 168 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); 169 } 170 EXPORT_SYMBOL(iio_read_const_attr); 171 172 static int __init iio_init(void) 173 { 174 int ret; 175 176 /* Register sysfs bus */ 177 ret = bus_register(&iio_bus_type); 178 if (ret < 0) { 179 pr_err("could not register bus type\n"); 180 goto error_nothing; 181 } 182 183 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); 184 if (ret < 0) { 185 pr_err("failed to allocate char dev region\n"); 186 goto error_unregister_bus_type; 187 } 188 189 iio_debugfs_dentry = debugfs_create_dir("iio", NULL); 190 191 return 0; 192 193 error_unregister_bus_type: 194 bus_unregister(&iio_bus_type); 195 error_nothing: 196 return ret; 197 } 198 199 static void __exit iio_exit(void) 200 { 201 if (iio_devt) 202 unregister_chrdev_region(iio_devt, IIO_DEV_MAX); 203 bus_unregister(&iio_bus_type); 204 debugfs_remove(iio_debugfs_dentry); 205 } 206 207 #if defined(CONFIG_DEBUG_FS) 208 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, 209 size_t count, loff_t *ppos) 210 { 211 struct iio_dev *indio_dev = file->private_data; 212 char buf[20]; 213 unsigned val = 0; 214 ssize_t len; 215 int ret; 216 217 ret = indio_dev->info->debugfs_reg_access(indio_dev, 218 indio_dev->cached_reg_addr, 219 0, &val); 220 if (ret) 221 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); 222 223 len = snprintf(buf, sizeof(buf), "0x%X\n", val); 224 225 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 226 } 227 228 static ssize_t iio_debugfs_write_reg(struct file *file, 229 const char __user *userbuf, size_t count, loff_t *ppos) 230 { 231 struct iio_dev *indio_dev = file->private_data; 232 unsigned reg, val; 233 char buf[80]; 234 int ret; 235 236 count = min_t(size_t, count, (sizeof(buf)-1)); 237 if (copy_from_user(buf, userbuf, count)) 238 return -EFAULT; 239 240 buf[count] = 0; 241 242 ret = sscanf(buf, "%i %i", ®, &val); 243 244 switch (ret) { 245 case 1: 246 indio_dev->cached_reg_addr = reg; 247 break; 248 case 2: 249 indio_dev->cached_reg_addr = reg; 250 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, 251 val, NULL); 252 if (ret) { 253 dev_err(indio_dev->dev.parent, "%s: write failed\n", 254 __func__); 255 return ret; 256 } 257 break; 258 default: 259 return -EINVAL; 260 } 261 262 return count; 263 } 264 265 static const struct file_operations iio_debugfs_reg_fops = { 266 .open = simple_open, 267 .read = iio_debugfs_read_reg, 268 .write = iio_debugfs_write_reg, 269 }; 270 271 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 272 { 273 debugfs_remove_recursive(indio_dev->debugfs_dentry); 274 } 275 276 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 277 { 278 struct dentry *d; 279 280 if (indio_dev->info->debugfs_reg_access == NULL) 281 return 0; 282 283 if (!iio_debugfs_dentry) 284 return 0; 285 286 indio_dev->debugfs_dentry = 287 debugfs_create_dir(dev_name(&indio_dev->dev), 288 iio_debugfs_dentry); 289 if (indio_dev->debugfs_dentry == NULL) { 290 dev_warn(indio_dev->dev.parent, 291 "Failed to create debugfs directory\n"); 292 return -EFAULT; 293 } 294 295 d = debugfs_create_file("direct_reg_access", 0644, 296 indio_dev->debugfs_dentry, 297 indio_dev, &iio_debugfs_reg_fops); 298 if (!d) { 299 iio_device_unregister_debugfs(indio_dev); 300 return -ENOMEM; 301 } 302 303 return 0; 304 } 305 #else 306 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 307 { 308 return 0; 309 } 310 311 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 312 { 313 } 314 #endif /* CONFIG_DEBUG_FS */ 315 316 static ssize_t iio_read_channel_ext_info(struct device *dev, 317 struct device_attribute *attr, 318 char *buf) 319 { 320 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 321 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 322 const struct iio_chan_spec_ext_info *ext_info; 323 324 ext_info = &this_attr->c->ext_info[this_attr->address]; 325 326 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); 327 } 328 329 static ssize_t iio_write_channel_ext_info(struct device *dev, 330 struct device_attribute *attr, 331 const char *buf, 332 size_t len) 333 { 334 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 335 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 336 const struct iio_chan_spec_ext_info *ext_info; 337 338 ext_info = &this_attr->c->ext_info[this_attr->address]; 339 340 return ext_info->write(indio_dev, ext_info->private, 341 this_attr->c, buf, len); 342 } 343 344 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 345 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 346 { 347 const struct iio_enum *e = (const struct iio_enum *)priv; 348 unsigned int i; 349 size_t len = 0; 350 351 if (!e->num_items) 352 return 0; 353 354 for (i = 0; i < e->num_items; ++i) 355 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); 356 357 /* replace last space with a newline */ 358 buf[len - 1] = '\n'; 359 360 return len; 361 } 362 EXPORT_SYMBOL_GPL(iio_enum_available_read); 363 364 ssize_t iio_enum_read(struct iio_dev *indio_dev, 365 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 366 { 367 const struct iio_enum *e = (const struct iio_enum *)priv; 368 int i; 369 370 if (!e->get) 371 return -EINVAL; 372 373 i = e->get(indio_dev, chan); 374 if (i < 0) 375 return i; 376 else if (i >= e->num_items) 377 return -EINVAL; 378 379 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); 380 } 381 EXPORT_SYMBOL_GPL(iio_enum_read); 382 383 ssize_t iio_enum_write(struct iio_dev *indio_dev, 384 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 385 size_t len) 386 { 387 const struct iio_enum *e = (const struct iio_enum *)priv; 388 unsigned int i; 389 int ret; 390 391 if (!e->set) 392 return -EINVAL; 393 394 for (i = 0; i < e->num_items; i++) { 395 if (sysfs_streq(buf, e->items[i])) 396 break; 397 } 398 399 if (i == e->num_items) 400 return -EINVAL; 401 402 ret = e->set(indio_dev, chan, i); 403 return ret ? ret : len; 404 } 405 EXPORT_SYMBOL_GPL(iio_enum_write); 406 407 /** 408 * iio_format_value() - Formats a IIO value into its string representation 409 * @buf: The buffer to which the formatted value gets written 410 * @type: One of the IIO_VAL_... constants. This decides how the val 411 * and val2 parameters are formatted. 412 * @size: Number of IIO value entries contained in vals 413 * @vals: Pointer to the values, exact meaning depends on the 414 * type parameter. 415 * 416 * Return: 0 by default, a negative number on failure or the 417 * total number of characters written for a type that belongs 418 * to the IIO_VAL_... constant. 419 */ 420 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) 421 { 422 unsigned long long tmp; 423 bool scale_db = false; 424 425 switch (type) { 426 case IIO_VAL_INT: 427 return sprintf(buf, "%d\n", vals[0]); 428 case IIO_VAL_INT_PLUS_MICRO_DB: 429 scale_db = true; 430 case IIO_VAL_INT_PLUS_MICRO: 431 if (vals[1] < 0) 432 return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]), 433 -vals[1], 434 scale_db ? " dB" : ""); 435 else 436 return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], 437 scale_db ? " dB" : ""); 438 case IIO_VAL_INT_PLUS_NANO: 439 if (vals[1] < 0) 440 return sprintf(buf, "-%ld.%09u\n", abs(vals[0]), 441 -vals[1]); 442 else 443 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 444 case IIO_VAL_FRACTIONAL: 445 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); 446 vals[1] = do_div(tmp, 1000000000LL); 447 vals[0] = tmp; 448 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 449 case IIO_VAL_FRACTIONAL_LOG2: 450 tmp = (s64)vals[0] * 1000000000LL >> vals[1]; 451 vals[1] = do_div(tmp, 1000000000LL); 452 vals[0] = tmp; 453 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 454 case IIO_VAL_INT_MULTIPLE: 455 { 456 int i; 457 int len = 0; 458 459 for (i = 0; i < size; ++i) 460 len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", 461 vals[i]); 462 len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); 463 return len; 464 } 465 default: 466 return 0; 467 } 468 } 469 470 static ssize_t iio_read_channel_info(struct device *dev, 471 struct device_attribute *attr, 472 char *buf) 473 { 474 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 475 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 476 int vals[INDIO_MAX_RAW_ELEMENTS]; 477 int ret; 478 int val_len = 2; 479 480 if (indio_dev->info->read_raw_multi) 481 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, 482 INDIO_MAX_RAW_ELEMENTS, 483 vals, &val_len, 484 this_attr->address); 485 else 486 ret = indio_dev->info->read_raw(indio_dev, this_attr->c, 487 &vals[0], &vals[1], this_attr->address); 488 489 if (ret < 0) 490 return ret; 491 492 return iio_format_value(buf, ret, val_len, vals); 493 } 494 495 /** 496 * iio_str_to_fixpoint() - Parse a fixed-point number from a string 497 * @str: The string to parse 498 * @fract_mult: Multiplier for the first decimal place, should be a power of 10 499 * @integer: The integer part of the number 500 * @fract: The fractional part of the number 501 * 502 * Returns 0 on success, or a negative error code if the string could not be 503 * parsed. 504 */ 505 int iio_str_to_fixpoint(const char *str, int fract_mult, 506 int *integer, int *fract) 507 { 508 int i = 0, f = 0; 509 bool integer_part = true, negative = false; 510 511 if (str[0] == '-') { 512 negative = true; 513 str++; 514 } else if (str[0] == '+') { 515 str++; 516 } 517 518 while (*str) { 519 if ('0' <= *str && *str <= '9') { 520 if (integer_part) { 521 i = i * 10 + *str - '0'; 522 } else { 523 f += fract_mult * (*str - '0'); 524 fract_mult /= 10; 525 } 526 } else if (*str == '\n') { 527 if (*(str + 1) == '\0') 528 break; 529 else 530 return -EINVAL; 531 } else if (*str == '.' && integer_part) { 532 integer_part = false; 533 } else { 534 return -EINVAL; 535 } 536 str++; 537 } 538 539 if (negative) { 540 if (i) 541 i = -i; 542 else 543 f = -f; 544 } 545 546 *integer = i; 547 *fract = f; 548 549 return 0; 550 } 551 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); 552 553 static ssize_t iio_write_channel_info(struct device *dev, 554 struct device_attribute *attr, 555 const char *buf, 556 size_t len) 557 { 558 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 559 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 560 int ret, fract_mult = 100000; 561 int integer, fract; 562 563 /* Assumes decimal - precision based on number of digits */ 564 if (!indio_dev->info->write_raw) 565 return -EINVAL; 566 567 if (indio_dev->info->write_raw_get_fmt) 568 switch (indio_dev->info->write_raw_get_fmt(indio_dev, 569 this_attr->c, this_attr->address)) { 570 case IIO_VAL_INT_PLUS_MICRO: 571 fract_mult = 100000; 572 break; 573 case IIO_VAL_INT_PLUS_NANO: 574 fract_mult = 100000000; 575 break; 576 default: 577 return -EINVAL; 578 } 579 580 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); 581 if (ret) 582 return ret; 583 584 ret = indio_dev->info->write_raw(indio_dev, this_attr->c, 585 integer, fract, this_attr->address); 586 if (ret) 587 return ret; 588 589 return len; 590 } 591 592 static 593 int __iio_device_attr_init(struct device_attribute *dev_attr, 594 const char *postfix, 595 struct iio_chan_spec const *chan, 596 ssize_t (*readfunc)(struct device *dev, 597 struct device_attribute *attr, 598 char *buf), 599 ssize_t (*writefunc)(struct device *dev, 600 struct device_attribute *attr, 601 const char *buf, 602 size_t len), 603 enum iio_shared_by shared_by) 604 { 605 int ret = 0; 606 char *name = NULL; 607 char *full_postfix; 608 sysfs_attr_init(&dev_attr->attr); 609 610 /* Build up postfix of <extend_name>_<modifier>_postfix */ 611 if (chan->modified && (shared_by == IIO_SEPARATE)) { 612 if (chan->extend_name) 613 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 614 iio_modifier_names[chan 615 ->channel2], 616 chan->extend_name, 617 postfix); 618 else 619 full_postfix = kasprintf(GFP_KERNEL, "%s_%s", 620 iio_modifier_names[chan 621 ->channel2], 622 postfix); 623 } else { 624 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) 625 full_postfix = kstrdup(postfix, GFP_KERNEL); 626 else 627 full_postfix = kasprintf(GFP_KERNEL, 628 "%s_%s", 629 chan->extend_name, 630 postfix); 631 } 632 if (full_postfix == NULL) 633 return -ENOMEM; 634 635 if (chan->differential) { /* Differential can not have modifier */ 636 switch (shared_by) { 637 case IIO_SHARED_BY_ALL: 638 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 639 break; 640 case IIO_SHARED_BY_DIR: 641 name = kasprintf(GFP_KERNEL, "%s_%s", 642 iio_direction[chan->output], 643 full_postfix); 644 break; 645 case IIO_SHARED_BY_TYPE: 646 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", 647 iio_direction[chan->output], 648 iio_chan_type_name_spec[chan->type], 649 iio_chan_type_name_spec[chan->type], 650 full_postfix); 651 break; 652 case IIO_SEPARATE: 653 if (!chan->indexed) { 654 WARN_ON("Differential channels must be indexed\n"); 655 ret = -EINVAL; 656 goto error_free_full_postfix; 657 } 658 name = kasprintf(GFP_KERNEL, 659 "%s_%s%d-%s%d_%s", 660 iio_direction[chan->output], 661 iio_chan_type_name_spec[chan->type], 662 chan->channel, 663 iio_chan_type_name_spec[chan->type], 664 chan->channel2, 665 full_postfix); 666 break; 667 } 668 } else { /* Single ended */ 669 switch (shared_by) { 670 case IIO_SHARED_BY_ALL: 671 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 672 break; 673 case IIO_SHARED_BY_DIR: 674 name = kasprintf(GFP_KERNEL, "%s_%s", 675 iio_direction[chan->output], 676 full_postfix); 677 break; 678 case IIO_SHARED_BY_TYPE: 679 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 680 iio_direction[chan->output], 681 iio_chan_type_name_spec[chan->type], 682 full_postfix); 683 break; 684 685 case IIO_SEPARATE: 686 if (chan->indexed) 687 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", 688 iio_direction[chan->output], 689 iio_chan_type_name_spec[chan->type], 690 chan->channel, 691 full_postfix); 692 else 693 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 694 iio_direction[chan->output], 695 iio_chan_type_name_spec[chan->type], 696 full_postfix); 697 break; 698 } 699 } 700 if (name == NULL) { 701 ret = -ENOMEM; 702 goto error_free_full_postfix; 703 } 704 dev_attr->attr.name = name; 705 706 if (readfunc) { 707 dev_attr->attr.mode |= S_IRUGO; 708 dev_attr->show = readfunc; 709 } 710 711 if (writefunc) { 712 dev_attr->attr.mode |= S_IWUSR; 713 dev_attr->store = writefunc; 714 } 715 716 error_free_full_postfix: 717 kfree(full_postfix); 718 719 return ret; 720 } 721 722 static void __iio_device_attr_deinit(struct device_attribute *dev_attr) 723 { 724 kfree(dev_attr->attr.name); 725 } 726 727 int __iio_add_chan_devattr(const char *postfix, 728 struct iio_chan_spec const *chan, 729 ssize_t (*readfunc)(struct device *dev, 730 struct device_attribute *attr, 731 char *buf), 732 ssize_t (*writefunc)(struct device *dev, 733 struct device_attribute *attr, 734 const char *buf, 735 size_t len), 736 u64 mask, 737 enum iio_shared_by shared_by, 738 struct device *dev, 739 struct list_head *attr_list) 740 { 741 int ret; 742 struct iio_dev_attr *iio_attr, *t; 743 744 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); 745 if (iio_attr == NULL) 746 return -ENOMEM; 747 ret = __iio_device_attr_init(&iio_attr->dev_attr, 748 postfix, chan, 749 readfunc, writefunc, shared_by); 750 if (ret) 751 goto error_iio_dev_attr_free; 752 iio_attr->c = chan; 753 iio_attr->address = mask; 754 list_for_each_entry(t, attr_list, l) 755 if (strcmp(t->dev_attr.attr.name, 756 iio_attr->dev_attr.attr.name) == 0) { 757 if (shared_by == IIO_SEPARATE) 758 dev_err(dev, "tried to double register : %s\n", 759 t->dev_attr.attr.name); 760 ret = -EBUSY; 761 goto error_device_attr_deinit; 762 } 763 list_add(&iio_attr->l, attr_list); 764 765 return 0; 766 767 error_device_attr_deinit: 768 __iio_device_attr_deinit(&iio_attr->dev_attr); 769 error_iio_dev_attr_free: 770 kfree(iio_attr); 771 return ret; 772 } 773 774 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, 775 struct iio_chan_spec const *chan, 776 enum iio_shared_by shared_by, 777 const long *infomask) 778 { 779 int i, ret, attrcount = 0; 780 781 for_each_set_bit(i, infomask, sizeof(infomask)*8) { 782 if (i >= ARRAY_SIZE(iio_chan_info_postfix)) 783 return -EINVAL; 784 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], 785 chan, 786 &iio_read_channel_info, 787 &iio_write_channel_info, 788 i, 789 shared_by, 790 &indio_dev->dev, 791 &indio_dev->channel_attr_list); 792 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 793 continue; 794 else if (ret < 0) 795 return ret; 796 attrcount++; 797 } 798 799 return attrcount; 800 } 801 802 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, 803 struct iio_chan_spec const *chan) 804 { 805 int ret, attrcount = 0; 806 const struct iio_chan_spec_ext_info *ext_info; 807 808 if (chan->channel < 0) 809 return 0; 810 ret = iio_device_add_info_mask_type(indio_dev, chan, 811 IIO_SEPARATE, 812 &chan->info_mask_separate); 813 if (ret < 0) 814 return ret; 815 attrcount += ret; 816 817 ret = iio_device_add_info_mask_type(indio_dev, chan, 818 IIO_SHARED_BY_TYPE, 819 &chan->info_mask_shared_by_type); 820 if (ret < 0) 821 return ret; 822 attrcount += ret; 823 824 ret = iio_device_add_info_mask_type(indio_dev, chan, 825 IIO_SHARED_BY_DIR, 826 &chan->info_mask_shared_by_dir); 827 if (ret < 0) 828 return ret; 829 attrcount += ret; 830 831 ret = iio_device_add_info_mask_type(indio_dev, chan, 832 IIO_SHARED_BY_ALL, 833 &chan->info_mask_shared_by_all); 834 if (ret < 0) 835 return ret; 836 attrcount += ret; 837 838 if (chan->ext_info) { 839 unsigned int i = 0; 840 for (ext_info = chan->ext_info; ext_info->name; ext_info++) { 841 ret = __iio_add_chan_devattr(ext_info->name, 842 chan, 843 ext_info->read ? 844 &iio_read_channel_ext_info : NULL, 845 ext_info->write ? 846 &iio_write_channel_ext_info : NULL, 847 i, 848 ext_info->shared, 849 &indio_dev->dev, 850 &indio_dev->channel_attr_list); 851 i++; 852 if (ret == -EBUSY && ext_info->shared) 853 continue; 854 855 if (ret) 856 return ret; 857 858 attrcount++; 859 } 860 } 861 862 return attrcount; 863 } 864 865 /** 866 * iio_free_chan_devattr_list() - Free a list of IIO device attributes 867 * @attr_list: List of IIO device attributes 868 * 869 * This function frees the memory allocated for each of the IIO device 870 * attributes in the list. 871 */ 872 void iio_free_chan_devattr_list(struct list_head *attr_list) 873 { 874 struct iio_dev_attr *p, *n; 875 876 list_for_each_entry_safe(p, n, attr_list, l) { 877 kfree(p->dev_attr.attr.name); 878 list_del(&p->l); 879 kfree(p); 880 } 881 } 882 883 static ssize_t iio_show_dev_name(struct device *dev, 884 struct device_attribute *attr, 885 char *buf) 886 { 887 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 888 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); 889 } 890 891 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); 892 893 static int iio_device_register_sysfs(struct iio_dev *indio_dev) 894 { 895 int i, ret = 0, attrcount, attrn, attrcount_orig = 0; 896 struct iio_dev_attr *p; 897 struct attribute **attr; 898 899 /* First count elements in any existing group */ 900 if (indio_dev->info->attrs) { 901 attr = indio_dev->info->attrs->attrs; 902 while (*attr++ != NULL) 903 attrcount_orig++; 904 } 905 attrcount = attrcount_orig; 906 /* 907 * New channel registration method - relies on the fact a group does 908 * not need to be initialized if its name is NULL. 909 */ 910 if (indio_dev->channels) 911 for (i = 0; i < indio_dev->num_channels; i++) { 912 ret = iio_device_add_channel_sysfs(indio_dev, 913 &indio_dev 914 ->channels[i]); 915 if (ret < 0) 916 goto error_clear_attrs; 917 attrcount += ret; 918 } 919 920 if (indio_dev->name) 921 attrcount++; 922 923 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, 924 sizeof(indio_dev->chan_attr_group.attrs[0]), 925 GFP_KERNEL); 926 if (indio_dev->chan_attr_group.attrs == NULL) { 927 ret = -ENOMEM; 928 goto error_clear_attrs; 929 } 930 /* Copy across original attributes */ 931 if (indio_dev->info->attrs) 932 memcpy(indio_dev->chan_attr_group.attrs, 933 indio_dev->info->attrs->attrs, 934 sizeof(indio_dev->chan_attr_group.attrs[0]) 935 *attrcount_orig); 936 attrn = attrcount_orig; 937 /* Add all elements from the list. */ 938 list_for_each_entry(p, &indio_dev->channel_attr_list, l) 939 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; 940 if (indio_dev->name) 941 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; 942 943 indio_dev->groups[indio_dev->groupcounter++] = 944 &indio_dev->chan_attr_group; 945 946 return 0; 947 948 error_clear_attrs: 949 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 950 951 return ret; 952 } 953 954 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) 955 { 956 957 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 958 kfree(indio_dev->chan_attr_group.attrs); 959 indio_dev->chan_attr_group.attrs = NULL; 960 } 961 962 static void iio_dev_release(struct device *device) 963 { 964 struct iio_dev *indio_dev = dev_to_iio_dev(device); 965 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) 966 iio_device_unregister_trigger_consumer(indio_dev); 967 iio_device_unregister_eventset(indio_dev); 968 iio_device_unregister_sysfs(indio_dev); 969 970 iio_buffer_put(indio_dev->buffer); 971 972 ida_simple_remove(&iio_ida, indio_dev->id); 973 kfree(indio_dev); 974 } 975 976 struct device_type iio_device_type = { 977 .name = "iio_device", 978 .release = iio_dev_release, 979 }; 980 981 /** 982 * iio_device_alloc() - allocate an iio_dev from a driver 983 * @sizeof_priv: Space to allocate for private structure. 984 **/ 985 struct iio_dev *iio_device_alloc(int sizeof_priv) 986 { 987 struct iio_dev *dev; 988 size_t alloc_size; 989 990 alloc_size = sizeof(struct iio_dev); 991 if (sizeof_priv) { 992 alloc_size = ALIGN(alloc_size, IIO_ALIGN); 993 alloc_size += sizeof_priv; 994 } 995 /* ensure 32-byte alignment of whole construct ? */ 996 alloc_size += IIO_ALIGN - 1; 997 998 dev = kzalloc(alloc_size, GFP_KERNEL); 999 1000 if (dev) { 1001 dev->dev.groups = dev->groups; 1002 dev->dev.type = &iio_device_type; 1003 dev->dev.bus = &iio_bus_type; 1004 device_initialize(&dev->dev); 1005 dev_set_drvdata(&dev->dev, (void *)dev); 1006 mutex_init(&dev->mlock); 1007 mutex_init(&dev->info_exist_lock); 1008 INIT_LIST_HEAD(&dev->channel_attr_list); 1009 1010 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); 1011 if (dev->id < 0) { 1012 /* cannot use a dev_err as the name isn't available */ 1013 pr_err("failed to get device id\n"); 1014 kfree(dev); 1015 return NULL; 1016 } 1017 dev_set_name(&dev->dev, "iio:device%d", dev->id); 1018 INIT_LIST_HEAD(&dev->buffer_list); 1019 } 1020 1021 return dev; 1022 } 1023 EXPORT_SYMBOL(iio_device_alloc); 1024 1025 /** 1026 * iio_device_free() - free an iio_dev from a driver 1027 * @dev: the iio_dev associated with the device 1028 **/ 1029 void iio_device_free(struct iio_dev *dev) 1030 { 1031 if (dev) 1032 put_device(&dev->dev); 1033 } 1034 EXPORT_SYMBOL(iio_device_free); 1035 1036 static void devm_iio_device_release(struct device *dev, void *res) 1037 { 1038 iio_device_free(*(struct iio_dev **)res); 1039 } 1040 1041 static int devm_iio_device_match(struct device *dev, void *res, void *data) 1042 { 1043 struct iio_dev **r = res; 1044 if (!r || !*r) { 1045 WARN_ON(!r || !*r); 1046 return 0; 1047 } 1048 return *r == data; 1049 } 1050 1051 /** 1052 * devm_iio_device_alloc - Resource-managed iio_device_alloc() 1053 * @dev: Device to allocate iio_dev for 1054 * @sizeof_priv: Space to allocate for private structure. 1055 * 1056 * Managed iio_device_alloc. iio_dev allocated with this function is 1057 * automatically freed on driver detach. 1058 * 1059 * If an iio_dev allocated with this function needs to be freed separately, 1060 * devm_iio_device_free() must be used. 1061 * 1062 * RETURNS: 1063 * Pointer to allocated iio_dev on success, NULL on failure. 1064 */ 1065 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) 1066 { 1067 struct iio_dev **ptr, *iio_dev; 1068 1069 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), 1070 GFP_KERNEL); 1071 if (!ptr) 1072 return NULL; 1073 1074 iio_dev = iio_device_alloc(sizeof_priv); 1075 if (iio_dev) { 1076 *ptr = iio_dev; 1077 devres_add(dev, ptr); 1078 } else { 1079 devres_free(ptr); 1080 } 1081 1082 return iio_dev; 1083 } 1084 EXPORT_SYMBOL_GPL(devm_iio_device_alloc); 1085 1086 /** 1087 * devm_iio_device_free - Resource-managed iio_device_free() 1088 * @dev: Device this iio_dev belongs to 1089 * @iio_dev: the iio_dev associated with the device 1090 * 1091 * Free iio_dev allocated with devm_iio_device_alloc(). 1092 */ 1093 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) 1094 { 1095 int rc; 1096 1097 rc = devres_release(dev, devm_iio_device_release, 1098 devm_iio_device_match, iio_dev); 1099 WARN_ON(rc); 1100 } 1101 EXPORT_SYMBOL_GPL(devm_iio_device_free); 1102 1103 /** 1104 * iio_chrdev_open() - chrdev file open for buffer access and ioctls 1105 * @inode: Inode structure for identifying the device in the file system 1106 * @filp: File structure for iio device used to keep and later access 1107 * private data 1108 * 1109 * Return: 0 on success or -EBUSY if the device is already opened 1110 **/ 1111 static int iio_chrdev_open(struct inode *inode, struct file *filp) 1112 { 1113 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1114 struct iio_dev, chrdev); 1115 1116 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) 1117 return -EBUSY; 1118 1119 iio_device_get(indio_dev); 1120 1121 filp->private_data = indio_dev; 1122 1123 return 0; 1124 } 1125 1126 /** 1127 * iio_chrdev_release() - chrdev file close buffer access and ioctls 1128 * @inode: Inode structure pointer for the char device 1129 * @filp: File structure pointer for the char device 1130 * 1131 * Return: 0 for successful release 1132 */ 1133 static int iio_chrdev_release(struct inode *inode, struct file *filp) 1134 { 1135 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1136 struct iio_dev, chrdev); 1137 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); 1138 iio_device_put(indio_dev); 1139 1140 return 0; 1141 } 1142 1143 /* Somewhat of a cross file organization violation - ioctls here are actually 1144 * event related */ 1145 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1146 { 1147 struct iio_dev *indio_dev = filp->private_data; 1148 int __user *ip = (int __user *)arg; 1149 int fd; 1150 1151 if (!indio_dev->info) 1152 return -ENODEV; 1153 1154 if (cmd == IIO_GET_EVENT_FD_IOCTL) { 1155 fd = iio_event_getfd(indio_dev); 1156 if (copy_to_user(ip, &fd, sizeof(fd))) 1157 return -EFAULT; 1158 return 0; 1159 } 1160 return -EINVAL; 1161 } 1162 1163 static const struct file_operations iio_buffer_fileops = { 1164 .read = iio_buffer_read_first_n_outer_addr, 1165 .release = iio_chrdev_release, 1166 .open = iio_chrdev_open, 1167 .poll = iio_buffer_poll_addr, 1168 .owner = THIS_MODULE, 1169 .llseek = noop_llseek, 1170 .unlocked_ioctl = iio_ioctl, 1171 .compat_ioctl = iio_ioctl, 1172 }; 1173 1174 static int iio_check_unique_scan_index(struct iio_dev *indio_dev) 1175 { 1176 int i, j; 1177 const struct iio_chan_spec *channels = indio_dev->channels; 1178 1179 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) 1180 return 0; 1181 1182 for (i = 0; i < indio_dev->num_channels - 1; i++) { 1183 if (channels[i].scan_index < 0) 1184 continue; 1185 for (j = i + 1; j < indio_dev->num_channels; j++) 1186 if (channels[i].scan_index == channels[j].scan_index) { 1187 dev_err(&indio_dev->dev, 1188 "Duplicate scan index %d\n", 1189 channels[i].scan_index); 1190 return -EINVAL; 1191 } 1192 } 1193 1194 return 0; 1195 } 1196 1197 static const struct iio_buffer_setup_ops noop_ring_setup_ops; 1198 1199 /** 1200 * iio_device_register() - register a device with the IIO subsystem 1201 * @indio_dev: Device structure filled by the device driver 1202 **/ 1203 int iio_device_register(struct iio_dev *indio_dev) 1204 { 1205 int ret; 1206 1207 /* If the calling driver did not initialize of_node, do it here */ 1208 if (!indio_dev->dev.of_node && indio_dev->dev.parent) 1209 indio_dev->dev.of_node = indio_dev->dev.parent->of_node; 1210 1211 ret = iio_check_unique_scan_index(indio_dev); 1212 if (ret < 0) 1213 return ret; 1214 1215 /* configure elements for the chrdev */ 1216 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); 1217 1218 ret = iio_device_register_debugfs(indio_dev); 1219 if (ret) { 1220 dev_err(indio_dev->dev.parent, 1221 "Failed to register debugfs interfaces\n"); 1222 return ret; 1223 } 1224 1225 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); 1226 if (ret) { 1227 dev_err(indio_dev->dev.parent, 1228 "Failed to create buffer sysfs interfaces\n"); 1229 goto error_unreg_debugfs; 1230 } 1231 1232 ret = iio_device_register_sysfs(indio_dev); 1233 if (ret) { 1234 dev_err(indio_dev->dev.parent, 1235 "Failed to register sysfs interfaces\n"); 1236 goto error_buffer_free_sysfs; 1237 } 1238 ret = iio_device_register_eventset(indio_dev); 1239 if (ret) { 1240 dev_err(indio_dev->dev.parent, 1241 "Failed to register event set\n"); 1242 goto error_free_sysfs; 1243 } 1244 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) 1245 iio_device_register_trigger_consumer(indio_dev); 1246 1247 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && 1248 indio_dev->setup_ops == NULL) 1249 indio_dev->setup_ops = &noop_ring_setup_ops; 1250 1251 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); 1252 indio_dev->chrdev.owner = indio_dev->info->driver_module; 1253 indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; 1254 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); 1255 if (ret < 0) 1256 goto error_unreg_eventset; 1257 1258 ret = device_add(&indio_dev->dev); 1259 if (ret < 0) 1260 goto error_cdev_del; 1261 1262 return 0; 1263 error_cdev_del: 1264 cdev_del(&indio_dev->chrdev); 1265 error_unreg_eventset: 1266 iio_device_unregister_eventset(indio_dev); 1267 error_free_sysfs: 1268 iio_device_unregister_sysfs(indio_dev); 1269 error_buffer_free_sysfs: 1270 iio_buffer_free_sysfs_and_mask(indio_dev); 1271 error_unreg_debugfs: 1272 iio_device_unregister_debugfs(indio_dev); 1273 return ret; 1274 } 1275 EXPORT_SYMBOL(iio_device_register); 1276 1277 /** 1278 * iio_device_unregister() - unregister a device from the IIO subsystem 1279 * @indio_dev: Device structure representing the device. 1280 **/ 1281 void iio_device_unregister(struct iio_dev *indio_dev) 1282 { 1283 mutex_lock(&indio_dev->info_exist_lock); 1284 1285 device_del(&indio_dev->dev); 1286 1287 if (indio_dev->chrdev.dev) 1288 cdev_del(&indio_dev->chrdev); 1289 iio_device_unregister_debugfs(indio_dev); 1290 1291 iio_disable_all_buffers(indio_dev); 1292 1293 indio_dev->info = NULL; 1294 1295 iio_device_wakeup_eventset(indio_dev); 1296 iio_buffer_wakeup_poll(indio_dev); 1297 1298 mutex_unlock(&indio_dev->info_exist_lock); 1299 1300 iio_buffer_free_sysfs_and_mask(indio_dev); 1301 } 1302 EXPORT_SYMBOL(iio_device_unregister); 1303 1304 static void devm_iio_device_unreg(struct device *dev, void *res) 1305 { 1306 iio_device_unregister(*(struct iio_dev **)res); 1307 } 1308 1309 /** 1310 * devm_iio_device_register - Resource-managed iio_device_register() 1311 * @dev: Device to allocate iio_dev for 1312 * @indio_dev: Device structure filled by the device driver 1313 * 1314 * Managed iio_device_register. The IIO device registered with this 1315 * function is automatically unregistered on driver detach. This function 1316 * calls iio_device_register() internally. Refer to that function for more 1317 * information. 1318 * 1319 * If an iio_dev registered with this function needs to be unregistered 1320 * separately, devm_iio_device_unregister() must be used. 1321 * 1322 * RETURNS: 1323 * 0 on success, negative error number on failure. 1324 */ 1325 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) 1326 { 1327 struct iio_dev **ptr; 1328 int ret; 1329 1330 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); 1331 if (!ptr) 1332 return -ENOMEM; 1333 1334 *ptr = indio_dev; 1335 ret = iio_device_register(indio_dev); 1336 if (!ret) 1337 devres_add(dev, ptr); 1338 else 1339 devres_free(ptr); 1340 1341 return ret; 1342 } 1343 EXPORT_SYMBOL_GPL(devm_iio_device_register); 1344 1345 /** 1346 * devm_iio_device_unregister - Resource-managed iio_device_unregister() 1347 * @dev: Device this iio_dev belongs to 1348 * @indio_dev: the iio_dev associated with the device 1349 * 1350 * Unregister iio_dev registered with devm_iio_device_register(). 1351 */ 1352 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) 1353 { 1354 int rc; 1355 1356 rc = devres_release(dev, devm_iio_device_unreg, 1357 devm_iio_device_match, indio_dev); 1358 WARN_ON(rc); 1359 } 1360 EXPORT_SYMBOL_GPL(devm_iio_device_unregister); 1361 1362 subsys_initcall(iio_init); 1363 module_exit(iio_exit); 1364 1365 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); 1366 MODULE_DESCRIPTION("Industrial I/O core"); 1367 MODULE_LICENSE("GPL"); 1368