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/mutex.h> 29 #include <linux/iio/iio.h> 30 #include "iio_core.h" 31 #include "iio_core_trigger.h" 32 #include <linux/iio/sysfs.h> 33 #include <linux/iio/events.h> 34 #include <linux/iio/buffer.h> 35 #include <linux/iio/buffer_impl.h> 36 37 /* IDA to assign each registered device a unique id */ 38 static DEFINE_IDA(iio_ida); 39 40 static dev_t iio_devt; 41 42 #define IIO_DEV_MAX 256 43 struct bus_type iio_bus_type = { 44 .name = "iio", 45 }; 46 EXPORT_SYMBOL(iio_bus_type); 47 48 static struct dentry *iio_debugfs_dentry; 49 50 static const char * const iio_direction[] = { 51 [0] = "in", 52 [1] = "out", 53 }; 54 55 static const char * const iio_chan_type_name_spec[] = { 56 [IIO_VOLTAGE] = "voltage", 57 [IIO_CURRENT] = "current", 58 [IIO_POWER] = "power", 59 [IIO_ACCEL] = "accel", 60 [IIO_ANGL_VEL] = "anglvel", 61 [IIO_MAGN] = "magn", 62 [IIO_LIGHT] = "illuminance", 63 [IIO_INTENSITY] = "intensity", 64 [IIO_PROXIMITY] = "proximity", 65 [IIO_TEMP] = "temp", 66 [IIO_INCLI] = "incli", 67 [IIO_ROT] = "rot", 68 [IIO_ANGL] = "angl", 69 [IIO_TIMESTAMP] = "timestamp", 70 [IIO_CAPACITANCE] = "capacitance", 71 [IIO_ALTVOLTAGE] = "altvoltage", 72 [IIO_CCT] = "cct", 73 [IIO_PRESSURE] = "pressure", 74 [IIO_HUMIDITYRELATIVE] = "humidityrelative", 75 [IIO_ACTIVITY] = "activity", 76 [IIO_STEPS] = "steps", 77 [IIO_ENERGY] = "energy", 78 [IIO_DISTANCE] = "distance", 79 [IIO_VELOCITY] = "velocity", 80 [IIO_CONCENTRATION] = "concentration", 81 [IIO_RESISTANCE] = "resistance", 82 [IIO_PH] = "ph", 83 [IIO_UVINDEX] = "uvindex", 84 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", 85 [IIO_COUNT] = "count", 86 [IIO_INDEX] = "index", 87 [IIO_GRAVITY] = "gravity", 88 }; 89 90 static const char * const iio_modifier_names[] = { 91 [IIO_MOD_X] = "x", 92 [IIO_MOD_Y] = "y", 93 [IIO_MOD_Z] = "z", 94 [IIO_MOD_X_AND_Y] = "x&y", 95 [IIO_MOD_X_AND_Z] = "x&z", 96 [IIO_MOD_Y_AND_Z] = "y&z", 97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 98 [IIO_MOD_X_OR_Y] = "x|y", 99 [IIO_MOD_X_OR_Z] = "x|z", 100 [IIO_MOD_Y_OR_Z] = "y|z", 101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 102 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 103 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 104 [IIO_MOD_LIGHT_BOTH] = "both", 105 [IIO_MOD_LIGHT_IR] = "ir", 106 [IIO_MOD_LIGHT_CLEAR] = "clear", 107 [IIO_MOD_LIGHT_RED] = "red", 108 [IIO_MOD_LIGHT_GREEN] = "green", 109 [IIO_MOD_LIGHT_BLUE] = "blue", 110 [IIO_MOD_LIGHT_UV] = "uv", 111 [IIO_MOD_QUATERNION] = "quaternion", 112 [IIO_MOD_TEMP_AMBIENT] = "ambient", 113 [IIO_MOD_TEMP_OBJECT] = "object", 114 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 115 [IIO_MOD_NORTH_TRUE] = "from_north_true", 116 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 117 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 118 [IIO_MOD_RUNNING] = "running", 119 [IIO_MOD_JOGGING] = "jogging", 120 [IIO_MOD_WALKING] = "walking", 121 [IIO_MOD_STILL] = "still", 122 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 123 [IIO_MOD_I] = "i", 124 [IIO_MOD_Q] = "q", 125 [IIO_MOD_CO2] = "co2", 126 [IIO_MOD_VOC] = "voc", 127 }; 128 129 /* relies on pairs of these shared then separate */ 130 static const char * const iio_chan_info_postfix[] = { 131 [IIO_CHAN_INFO_RAW] = "raw", 132 [IIO_CHAN_INFO_PROCESSED] = "input", 133 [IIO_CHAN_INFO_SCALE] = "scale", 134 [IIO_CHAN_INFO_OFFSET] = "offset", 135 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", 136 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", 137 [IIO_CHAN_INFO_PEAK] = "peak_raw", 138 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", 139 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", 140 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", 141 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] 142 = "filter_low_pass_3db_frequency", 143 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] 144 = "filter_high_pass_3db_frequency", 145 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", 146 [IIO_CHAN_INFO_FREQUENCY] = "frequency", 147 [IIO_CHAN_INFO_PHASE] = "phase", 148 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", 149 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", 150 [IIO_CHAN_INFO_INT_TIME] = "integration_time", 151 [IIO_CHAN_INFO_ENABLE] = "en", 152 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", 153 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", 154 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", 155 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", 156 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", 157 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", 158 }; 159 160 /** 161 * iio_find_channel_from_si() - get channel from its scan index 162 * @indio_dev: device 163 * @si: scan index to match 164 */ 165 const struct iio_chan_spec 166 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) 167 { 168 int i; 169 170 for (i = 0; i < indio_dev->num_channels; i++) 171 if (indio_dev->channels[i].scan_index == si) 172 return &indio_dev->channels[i]; 173 return NULL; 174 } 175 176 /* This turns up an awful lot */ 177 ssize_t iio_read_const_attr(struct device *dev, 178 struct device_attribute *attr, 179 char *buf) 180 { 181 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); 182 } 183 EXPORT_SYMBOL(iio_read_const_attr); 184 185 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) 186 { 187 int ret; 188 const struct iio_event_interface *ev_int = indio_dev->event_interface; 189 190 ret = mutex_lock_interruptible(&indio_dev->mlock); 191 if (ret) 192 return ret; 193 if ((ev_int && iio_event_enabled(ev_int)) || 194 iio_buffer_enabled(indio_dev)) { 195 mutex_unlock(&indio_dev->mlock); 196 return -EBUSY; 197 } 198 indio_dev->clock_id = clock_id; 199 mutex_unlock(&indio_dev->mlock); 200 201 return 0; 202 } 203 204 /** 205 * iio_get_time_ns() - utility function to get a time stamp for events etc 206 * @indio_dev: device 207 */ 208 s64 iio_get_time_ns(const struct iio_dev *indio_dev) 209 { 210 struct timespec tp; 211 212 switch (iio_device_get_clock(indio_dev)) { 213 case CLOCK_REALTIME: 214 ktime_get_real_ts(&tp); 215 break; 216 case CLOCK_MONOTONIC: 217 ktime_get_ts(&tp); 218 break; 219 case CLOCK_MONOTONIC_RAW: 220 getrawmonotonic(&tp); 221 break; 222 case CLOCK_REALTIME_COARSE: 223 tp = current_kernel_time(); 224 break; 225 case CLOCK_MONOTONIC_COARSE: 226 tp = get_monotonic_coarse(); 227 break; 228 case CLOCK_BOOTTIME: 229 get_monotonic_boottime(&tp); 230 break; 231 case CLOCK_TAI: 232 timekeeping_clocktai(&tp); 233 break; 234 default: 235 BUG(); 236 } 237 238 return timespec_to_ns(&tp); 239 } 240 EXPORT_SYMBOL(iio_get_time_ns); 241 242 /** 243 * iio_get_time_res() - utility function to get time stamp clock resolution in 244 * nano seconds. 245 * @indio_dev: device 246 */ 247 unsigned int iio_get_time_res(const struct iio_dev *indio_dev) 248 { 249 switch (iio_device_get_clock(indio_dev)) { 250 case CLOCK_REALTIME: 251 case CLOCK_MONOTONIC: 252 case CLOCK_MONOTONIC_RAW: 253 case CLOCK_BOOTTIME: 254 case CLOCK_TAI: 255 return hrtimer_resolution; 256 case CLOCK_REALTIME_COARSE: 257 case CLOCK_MONOTONIC_COARSE: 258 return LOW_RES_NSEC; 259 default: 260 BUG(); 261 } 262 } 263 EXPORT_SYMBOL(iio_get_time_res); 264 265 static int __init iio_init(void) 266 { 267 int ret; 268 269 /* Register sysfs bus */ 270 ret = bus_register(&iio_bus_type); 271 if (ret < 0) { 272 pr_err("could not register bus type\n"); 273 goto error_nothing; 274 } 275 276 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); 277 if (ret < 0) { 278 pr_err("failed to allocate char dev region\n"); 279 goto error_unregister_bus_type; 280 } 281 282 iio_debugfs_dentry = debugfs_create_dir("iio", NULL); 283 284 return 0; 285 286 error_unregister_bus_type: 287 bus_unregister(&iio_bus_type); 288 error_nothing: 289 return ret; 290 } 291 292 static void __exit iio_exit(void) 293 { 294 if (iio_devt) 295 unregister_chrdev_region(iio_devt, IIO_DEV_MAX); 296 bus_unregister(&iio_bus_type); 297 debugfs_remove(iio_debugfs_dentry); 298 } 299 300 #if defined(CONFIG_DEBUG_FS) 301 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, 302 size_t count, loff_t *ppos) 303 { 304 struct iio_dev *indio_dev = file->private_data; 305 char buf[20]; 306 unsigned val = 0; 307 ssize_t len; 308 int ret; 309 310 ret = indio_dev->info->debugfs_reg_access(indio_dev, 311 indio_dev->cached_reg_addr, 312 0, &val); 313 if (ret) 314 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); 315 316 len = snprintf(buf, sizeof(buf), "0x%X\n", val); 317 318 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 319 } 320 321 static ssize_t iio_debugfs_write_reg(struct file *file, 322 const char __user *userbuf, size_t count, loff_t *ppos) 323 { 324 struct iio_dev *indio_dev = file->private_data; 325 unsigned reg, val; 326 char buf[80]; 327 int ret; 328 329 count = min_t(size_t, count, (sizeof(buf)-1)); 330 if (copy_from_user(buf, userbuf, count)) 331 return -EFAULT; 332 333 buf[count] = 0; 334 335 ret = sscanf(buf, "%i %i", ®, &val); 336 337 switch (ret) { 338 case 1: 339 indio_dev->cached_reg_addr = reg; 340 break; 341 case 2: 342 indio_dev->cached_reg_addr = reg; 343 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, 344 val, NULL); 345 if (ret) { 346 dev_err(indio_dev->dev.parent, "%s: write failed\n", 347 __func__); 348 return ret; 349 } 350 break; 351 default: 352 return -EINVAL; 353 } 354 355 return count; 356 } 357 358 static const struct file_operations iio_debugfs_reg_fops = { 359 .open = simple_open, 360 .read = iio_debugfs_read_reg, 361 .write = iio_debugfs_write_reg, 362 }; 363 364 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 365 { 366 debugfs_remove_recursive(indio_dev->debugfs_dentry); 367 } 368 369 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 370 { 371 struct dentry *d; 372 373 if (indio_dev->info->debugfs_reg_access == NULL) 374 return 0; 375 376 if (!iio_debugfs_dentry) 377 return 0; 378 379 indio_dev->debugfs_dentry = 380 debugfs_create_dir(dev_name(&indio_dev->dev), 381 iio_debugfs_dentry); 382 if (indio_dev->debugfs_dentry == NULL) { 383 dev_warn(indio_dev->dev.parent, 384 "Failed to create debugfs directory\n"); 385 return -EFAULT; 386 } 387 388 d = debugfs_create_file("direct_reg_access", 0644, 389 indio_dev->debugfs_dentry, 390 indio_dev, &iio_debugfs_reg_fops); 391 if (!d) { 392 iio_device_unregister_debugfs(indio_dev); 393 return -ENOMEM; 394 } 395 396 return 0; 397 } 398 #else 399 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 400 { 401 return 0; 402 } 403 404 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 405 { 406 } 407 #endif /* CONFIG_DEBUG_FS */ 408 409 static ssize_t iio_read_channel_ext_info(struct device *dev, 410 struct device_attribute *attr, 411 char *buf) 412 { 413 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 414 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 415 const struct iio_chan_spec_ext_info *ext_info; 416 417 ext_info = &this_attr->c->ext_info[this_attr->address]; 418 419 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); 420 } 421 422 static ssize_t iio_write_channel_ext_info(struct device *dev, 423 struct device_attribute *attr, 424 const char *buf, 425 size_t len) 426 { 427 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 428 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 429 const struct iio_chan_spec_ext_info *ext_info; 430 431 ext_info = &this_attr->c->ext_info[this_attr->address]; 432 433 return ext_info->write(indio_dev, ext_info->private, 434 this_attr->c, buf, len); 435 } 436 437 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 438 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 439 { 440 const struct iio_enum *e = (const struct iio_enum *)priv; 441 unsigned int i; 442 size_t len = 0; 443 444 if (!e->num_items) 445 return 0; 446 447 for (i = 0; i < e->num_items; ++i) 448 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); 449 450 /* replace last space with a newline */ 451 buf[len - 1] = '\n'; 452 453 return len; 454 } 455 EXPORT_SYMBOL_GPL(iio_enum_available_read); 456 457 ssize_t iio_enum_read(struct iio_dev *indio_dev, 458 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 459 { 460 const struct iio_enum *e = (const struct iio_enum *)priv; 461 int i; 462 463 if (!e->get) 464 return -EINVAL; 465 466 i = e->get(indio_dev, chan); 467 if (i < 0) 468 return i; 469 else if (i >= e->num_items) 470 return -EINVAL; 471 472 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); 473 } 474 EXPORT_SYMBOL_GPL(iio_enum_read); 475 476 ssize_t iio_enum_write(struct iio_dev *indio_dev, 477 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 478 size_t len) 479 { 480 const struct iio_enum *e = (const struct iio_enum *)priv; 481 int ret; 482 483 if (!e->set) 484 return -EINVAL; 485 486 ret = __sysfs_match_string(e->items, e->num_items, buf); 487 if (ret < 0) 488 return ret; 489 490 ret = e->set(indio_dev, chan, ret); 491 return ret ? ret : len; 492 } 493 EXPORT_SYMBOL_GPL(iio_enum_write); 494 495 static const struct iio_mount_matrix iio_mount_idmatrix = { 496 .rotation = { 497 "1", "0", "0", 498 "0", "1", "0", 499 "0", "0", "1" 500 } 501 }; 502 503 static int iio_setup_mount_idmatrix(const struct device *dev, 504 struct iio_mount_matrix *matrix) 505 { 506 *matrix = iio_mount_idmatrix; 507 dev_info(dev, "mounting matrix not found: using identity...\n"); 508 return 0; 509 } 510 511 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, 512 const struct iio_chan_spec *chan, char *buf) 513 { 514 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) 515 priv)(indio_dev, chan); 516 517 if (IS_ERR(mtx)) 518 return PTR_ERR(mtx); 519 520 if (!mtx) 521 mtx = &iio_mount_idmatrix; 522 523 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", 524 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], 525 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], 526 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); 527 } 528 EXPORT_SYMBOL_GPL(iio_show_mount_matrix); 529 530 /** 531 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from 532 * device-tree "mount-matrix" property 533 * @dev: device the mounting matrix property is assigned to 534 * @propname: device specific mounting matrix property name 535 * @matrix: where to store retrieved matrix 536 * 537 * If device is assigned no mounting matrix property, a default 3x3 identity 538 * matrix will be filled in. 539 * 540 * Return: 0 if success, or a negative error code on failure. 541 */ 542 #ifdef CONFIG_OF 543 int of_iio_read_mount_matrix(const struct device *dev, 544 const char *propname, 545 struct iio_mount_matrix *matrix) 546 { 547 if (dev->of_node) { 548 int err = of_property_read_string_array(dev->of_node, 549 propname, matrix->rotation, 550 ARRAY_SIZE(iio_mount_idmatrix.rotation)); 551 552 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) 553 return 0; 554 555 if (err >= 0) 556 /* Invalid number of matrix entries. */ 557 return -EINVAL; 558 559 if (err != -EINVAL) 560 /* Invalid matrix declaration format. */ 561 return err; 562 } 563 564 /* Matrix was not declared at all: fallback to identity. */ 565 return iio_setup_mount_idmatrix(dev, matrix); 566 } 567 #else 568 int of_iio_read_mount_matrix(const struct device *dev, 569 const char *propname, 570 struct iio_mount_matrix *matrix) 571 { 572 return iio_setup_mount_idmatrix(dev, matrix); 573 } 574 #endif 575 EXPORT_SYMBOL(of_iio_read_mount_matrix); 576 577 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, 578 int size, const int *vals) 579 { 580 unsigned long long tmp; 581 int tmp0, tmp1; 582 bool scale_db = false; 583 584 switch (type) { 585 case IIO_VAL_INT: 586 return snprintf(buf, len, "%d", vals[0]); 587 case IIO_VAL_INT_PLUS_MICRO_DB: 588 scale_db = true; 589 case IIO_VAL_INT_PLUS_MICRO: 590 if (vals[1] < 0) 591 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]), 592 -vals[1], scale_db ? " dB" : ""); 593 else 594 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1], 595 scale_db ? " dB" : ""); 596 case IIO_VAL_INT_PLUS_NANO: 597 if (vals[1] < 0) 598 return snprintf(buf, len, "-%d.%09u", abs(vals[0]), 599 -vals[1]); 600 else 601 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]); 602 case IIO_VAL_FRACTIONAL: 603 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); 604 tmp1 = vals[1]; 605 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); 606 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); 607 case IIO_VAL_FRACTIONAL_LOG2: 608 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]); 609 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1); 610 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); 611 case IIO_VAL_INT_MULTIPLE: 612 { 613 int i; 614 int l = 0; 615 616 for (i = 0; i < size; ++i) { 617 l += snprintf(&buf[l], len - l, "%d ", vals[i]); 618 if (l >= len) 619 break; 620 } 621 return l; 622 } 623 default: 624 return 0; 625 } 626 } 627 628 /** 629 * iio_format_value() - Formats a IIO value into its string representation 630 * @buf: The buffer to which the formatted value gets written 631 * which is assumed to be big enough (i.e. PAGE_SIZE). 632 * @type: One of the IIO_VAL_... constants. This decides how the val 633 * and val2 parameters are formatted. 634 * @size: Number of IIO value entries contained in vals 635 * @vals: Pointer to the values, exact meaning depends on the 636 * type parameter. 637 * 638 * Return: 0 by default, a negative number on failure or the 639 * total number of characters written for a type that belongs 640 * to the IIO_VAL_... constant. 641 */ 642 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) 643 { 644 ssize_t len; 645 646 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals); 647 if (len >= PAGE_SIZE - 1) 648 return -EFBIG; 649 650 return len + sprintf(buf + len, "\n"); 651 } 652 EXPORT_SYMBOL_GPL(iio_format_value); 653 654 static ssize_t iio_read_channel_info(struct device *dev, 655 struct device_attribute *attr, 656 char *buf) 657 { 658 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 659 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 660 int vals[INDIO_MAX_RAW_ELEMENTS]; 661 int ret; 662 int val_len = 2; 663 664 if (indio_dev->info->read_raw_multi) 665 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, 666 INDIO_MAX_RAW_ELEMENTS, 667 vals, &val_len, 668 this_attr->address); 669 else 670 ret = indio_dev->info->read_raw(indio_dev, this_attr->c, 671 &vals[0], &vals[1], this_attr->address); 672 673 if (ret < 0) 674 return ret; 675 676 return iio_format_value(buf, ret, val_len, vals); 677 } 678 679 static ssize_t iio_format_avail_list(char *buf, const int *vals, 680 int type, int length) 681 { 682 int i; 683 ssize_t len = 0; 684 685 switch (type) { 686 case IIO_VAL_INT: 687 for (i = 0; i < length; i++) { 688 len += __iio_format_value(buf + len, PAGE_SIZE - len, 689 type, 1, &vals[i]); 690 if (len >= PAGE_SIZE) 691 return -EFBIG; 692 if (i < length - 1) 693 len += snprintf(buf + len, PAGE_SIZE - len, 694 " "); 695 else 696 len += snprintf(buf + len, PAGE_SIZE - len, 697 "\n"); 698 if (len >= PAGE_SIZE) 699 return -EFBIG; 700 } 701 break; 702 default: 703 for (i = 0; i < length / 2; i++) { 704 len += __iio_format_value(buf + len, PAGE_SIZE - len, 705 type, 2, &vals[i * 2]); 706 if (len >= PAGE_SIZE) 707 return -EFBIG; 708 if (i < length / 2 - 1) 709 len += snprintf(buf + len, PAGE_SIZE - len, 710 " "); 711 else 712 len += snprintf(buf + len, PAGE_SIZE - len, 713 "\n"); 714 if (len >= PAGE_SIZE) 715 return -EFBIG; 716 } 717 } 718 719 return len; 720 } 721 722 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) 723 { 724 int i; 725 ssize_t len; 726 727 len = snprintf(buf, PAGE_SIZE, "["); 728 switch (type) { 729 case IIO_VAL_INT: 730 for (i = 0; i < 3; i++) { 731 len += __iio_format_value(buf + len, PAGE_SIZE - len, 732 type, 1, &vals[i]); 733 if (len >= PAGE_SIZE) 734 return -EFBIG; 735 if (i < 2) 736 len += snprintf(buf + len, PAGE_SIZE - len, 737 " "); 738 else 739 len += snprintf(buf + len, PAGE_SIZE - len, 740 "]\n"); 741 if (len >= PAGE_SIZE) 742 return -EFBIG; 743 } 744 break; 745 default: 746 for (i = 0; i < 3; i++) { 747 len += __iio_format_value(buf + len, PAGE_SIZE - len, 748 type, 2, &vals[i * 2]); 749 if (len >= PAGE_SIZE) 750 return -EFBIG; 751 if (i < 2) 752 len += snprintf(buf + len, PAGE_SIZE - len, 753 " "); 754 else 755 len += snprintf(buf + len, PAGE_SIZE - len, 756 "]\n"); 757 if (len >= PAGE_SIZE) 758 return -EFBIG; 759 } 760 } 761 762 return len; 763 } 764 765 static ssize_t iio_read_channel_info_avail(struct device *dev, 766 struct device_attribute *attr, 767 char *buf) 768 { 769 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 770 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 771 const int *vals; 772 int ret; 773 int length; 774 int type; 775 776 ret = indio_dev->info->read_avail(indio_dev, this_attr->c, 777 &vals, &type, &length, 778 this_attr->address); 779 780 if (ret < 0) 781 return ret; 782 switch (ret) { 783 case IIO_AVAIL_LIST: 784 return iio_format_avail_list(buf, vals, type, length); 785 case IIO_AVAIL_RANGE: 786 return iio_format_avail_range(buf, vals, type); 787 default: 788 return -EINVAL; 789 } 790 } 791 792 /** 793 * iio_str_to_fixpoint() - Parse a fixed-point number from a string 794 * @str: The string to parse 795 * @fract_mult: Multiplier for the first decimal place, should be a power of 10 796 * @integer: The integer part of the number 797 * @fract: The fractional part of the number 798 * 799 * Returns 0 on success, or a negative error code if the string could not be 800 * parsed. 801 */ 802 int iio_str_to_fixpoint(const char *str, int fract_mult, 803 int *integer, int *fract) 804 { 805 int i = 0, f = 0; 806 bool integer_part = true, negative = false; 807 808 if (fract_mult == 0) { 809 *fract = 0; 810 811 return kstrtoint(str, 0, integer); 812 } 813 814 if (str[0] == '-') { 815 negative = true; 816 str++; 817 } else if (str[0] == '+') { 818 str++; 819 } 820 821 while (*str) { 822 if ('0' <= *str && *str <= '9') { 823 if (integer_part) { 824 i = i * 10 + *str - '0'; 825 } else { 826 f += fract_mult * (*str - '0'); 827 fract_mult /= 10; 828 } 829 } else if (*str == '\n') { 830 if (*(str + 1) == '\0') 831 break; 832 else 833 return -EINVAL; 834 } else if (*str == '.' && integer_part) { 835 integer_part = false; 836 } else { 837 return -EINVAL; 838 } 839 str++; 840 } 841 842 if (negative) { 843 if (i) 844 i = -i; 845 else 846 f = -f; 847 } 848 849 *integer = i; 850 *fract = f; 851 852 return 0; 853 } 854 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); 855 856 static ssize_t iio_write_channel_info(struct device *dev, 857 struct device_attribute *attr, 858 const char *buf, 859 size_t len) 860 { 861 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 862 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 863 int ret, fract_mult = 100000; 864 int integer, fract; 865 866 /* Assumes decimal - precision based on number of digits */ 867 if (!indio_dev->info->write_raw) 868 return -EINVAL; 869 870 if (indio_dev->info->write_raw_get_fmt) 871 switch (indio_dev->info->write_raw_get_fmt(indio_dev, 872 this_attr->c, this_attr->address)) { 873 case IIO_VAL_INT: 874 fract_mult = 0; 875 break; 876 case IIO_VAL_INT_PLUS_MICRO: 877 fract_mult = 100000; 878 break; 879 case IIO_VAL_INT_PLUS_NANO: 880 fract_mult = 100000000; 881 break; 882 default: 883 return -EINVAL; 884 } 885 886 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); 887 if (ret) 888 return ret; 889 890 ret = indio_dev->info->write_raw(indio_dev, this_attr->c, 891 integer, fract, this_attr->address); 892 if (ret) 893 return ret; 894 895 return len; 896 } 897 898 static 899 int __iio_device_attr_init(struct device_attribute *dev_attr, 900 const char *postfix, 901 struct iio_chan_spec const *chan, 902 ssize_t (*readfunc)(struct device *dev, 903 struct device_attribute *attr, 904 char *buf), 905 ssize_t (*writefunc)(struct device *dev, 906 struct device_attribute *attr, 907 const char *buf, 908 size_t len), 909 enum iio_shared_by shared_by) 910 { 911 int ret = 0; 912 char *name = NULL; 913 char *full_postfix; 914 sysfs_attr_init(&dev_attr->attr); 915 916 /* Build up postfix of <extend_name>_<modifier>_postfix */ 917 if (chan->modified && (shared_by == IIO_SEPARATE)) { 918 if (chan->extend_name) 919 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 920 iio_modifier_names[chan 921 ->channel2], 922 chan->extend_name, 923 postfix); 924 else 925 full_postfix = kasprintf(GFP_KERNEL, "%s_%s", 926 iio_modifier_names[chan 927 ->channel2], 928 postfix); 929 } else { 930 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) 931 full_postfix = kstrdup(postfix, GFP_KERNEL); 932 else 933 full_postfix = kasprintf(GFP_KERNEL, 934 "%s_%s", 935 chan->extend_name, 936 postfix); 937 } 938 if (full_postfix == NULL) 939 return -ENOMEM; 940 941 if (chan->differential) { /* Differential can not have modifier */ 942 switch (shared_by) { 943 case IIO_SHARED_BY_ALL: 944 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 945 break; 946 case IIO_SHARED_BY_DIR: 947 name = kasprintf(GFP_KERNEL, "%s_%s", 948 iio_direction[chan->output], 949 full_postfix); 950 break; 951 case IIO_SHARED_BY_TYPE: 952 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", 953 iio_direction[chan->output], 954 iio_chan_type_name_spec[chan->type], 955 iio_chan_type_name_spec[chan->type], 956 full_postfix); 957 break; 958 case IIO_SEPARATE: 959 if (!chan->indexed) { 960 WARN(1, "Differential channels must be indexed\n"); 961 ret = -EINVAL; 962 goto error_free_full_postfix; 963 } 964 name = kasprintf(GFP_KERNEL, 965 "%s_%s%d-%s%d_%s", 966 iio_direction[chan->output], 967 iio_chan_type_name_spec[chan->type], 968 chan->channel, 969 iio_chan_type_name_spec[chan->type], 970 chan->channel2, 971 full_postfix); 972 break; 973 } 974 } else { /* Single ended */ 975 switch (shared_by) { 976 case IIO_SHARED_BY_ALL: 977 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 978 break; 979 case IIO_SHARED_BY_DIR: 980 name = kasprintf(GFP_KERNEL, "%s_%s", 981 iio_direction[chan->output], 982 full_postfix); 983 break; 984 case IIO_SHARED_BY_TYPE: 985 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 986 iio_direction[chan->output], 987 iio_chan_type_name_spec[chan->type], 988 full_postfix); 989 break; 990 991 case IIO_SEPARATE: 992 if (chan->indexed) 993 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", 994 iio_direction[chan->output], 995 iio_chan_type_name_spec[chan->type], 996 chan->channel, 997 full_postfix); 998 else 999 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 1000 iio_direction[chan->output], 1001 iio_chan_type_name_spec[chan->type], 1002 full_postfix); 1003 break; 1004 } 1005 } 1006 if (name == NULL) { 1007 ret = -ENOMEM; 1008 goto error_free_full_postfix; 1009 } 1010 dev_attr->attr.name = name; 1011 1012 if (readfunc) { 1013 dev_attr->attr.mode |= S_IRUGO; 1014 dev_attr->show = readfunc; 1015 } 1016 1017 if (writefunc) { 1018 dev_attr->attr.mode |= S_IWUSR; 1019 dev_attr->store = writefunc; 1020 } 1021 1022 error_free_full_postfix: 1023 kfree(full_postfix); 1024 1025 return ret; 1026 } 1027 1028 static void __iio_device_attr_deinit(struct device_attribute *dev_attr) 1029 { 1030 kfree(dev_attr->attr.name); 1031 } 1032 1033 int __iio_add_chan_devattr(const char *postfix, 1034 struct iio_chan_spec const *chan, 1035 ssize_t (*readfunc)(struct device *dev, 1036 struct device_attribute *attr, 1037 char *buf), 1038 ssize_t (*writefunc)(struct device *dev, 1039 struct device_attribute *attr, 1040 const char *buf, 1041 size_t len), 1042 u64 mask, 1043 enum iio_shared_by shared_by, 1044 struct device *dev, 1045 struct list_head *attr_list) 1046 { 1047 int ret; 1048 struct iio_dev_attr *iio_attr, *t; 1049 1050 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); 1051 if (iio_attr == NULL) 1052 return -ENOMEM; 1053 ret = __iio_device_attr_init(&iio_attr->dev_attr, 1054 postfix, chan, 1055 readfunc, writefunc, shared_by); 1056 if (ret) 1057 goto error_iio_dev_attr_free; 1058 iio_attr->c = chan; 1059 iio_attr->address = mask; 1060 list_for_each_entry(t, attr_list, l) 1061 if (strcmp(t->dev_attr.attr.name, 1062 iio_attr->dev_attr.attr.name) == 0) { 1063 if (shared_by == IIO_SEPARATE) 1064 dev_err(dev, "tried to double register : %s\n", 1065 t->dev_attr.attr.name); 1066 ret = -EBUSY; 1067 goto error_device_attr_deinit; 1068 } 1069 list_add(&iio_attr->l, attr_list); 1070 1071 return 0; 1072 1073 error_device_attr_deinit: 1074 __iio_device_attr_deinit(&iio_attr->dev_attr); 1075 error_iio_dev_attr_free: 1076 kfree(iio_attr); 1077 return ret; 1078 } 1079 1080 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, 1081 struct iio_chan_spec const *chan, 1082 enum iio_shared_by shared_by, 1083 const long *infomask) 1084 { 1085 int i, ret, attrcount = 0; 1086 1087 for_each_set_bit(i, infomask, sizeof(*infomask)*8) { 1088 if (i >= ARRAY_SIZE(iio_chan_info_postfix)) 1089 return -EINVAL; 1090 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], 1091 chan, 1092 &iio_read_channel_info, 1093 &iio_write_channel_info, 1094 i, 1095 shared_by, 1096 &indio_dev->dev, 1097 &indio_dev->channel_attr_list); 1098 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 1099 continue; 1100 else if (ret < 0) 1101 return ret; 1102 attrcount++; 1103 } 1104 1105 return attrcount; 1106 } 1107 1108 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, 1109 struct iio_chan_spec const *chan, 1110 enum iio_shared_by shared_by, 1111 const long *infomask) 1112 { 1113 int i, ret, attrcount = 0; 1114 char *avail_postfix; 1115 1116 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { 1117 avail_postfix = kasprintf(GFP_KERNEL, 1118 "%s_available", 1119 iio_chan_info_postfix[i]); 1120 if (!avail_postfix) 1121 return -ENOMEM; 1122 1123 ret = __iio_add_chan_devattr(avail_postfix, 1124 chan, 1125 &iio_read_channel_info_avail, 1126 NULL, 1127 i, 1128 shared_by, 1129 &indio_dev->dev, 1130 &indio_dev->channel_attr_list); 1131 kfree(avail_postfix); 1132 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 1133 continue; 1134 else if (ret < 0) 1135 return ret; 1136 attrcount++; 1137 } 1138 1139 return attrcount; 1140 } 1141 1142 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, 1143 struct iio_chan_spec const *chan) 1144 { 1145 int ret, attrcount = 0; 1146 const struct iio_chan_spec_ext_info *ext_info; 1147 1148 if (chan->channel < 0) 1149 return 0; 1150 ret = iio_device_add_info_mask_type(indio_dev, chan, 1151 IIO_SEPARATE, 1152 &chan->info_mask_separate); 1153 if (ret < 0) 1154 return ret; 1155 attrcount += ret; 1156 1157 ret = iio_device_add_info_mask_type_avail(indio_dev, chan, 1158 IIO_SEPARATE, 1159 &chan-> 1160 info_mask_separate_available); 1161 if (ret < 0) 1162 return ret; 1163 attrcount += ret; 1164 1165 ret = iio_device_add_info_mask_type(indio_dev, chan, 1166 IIO_SHARED_BY_TYPE, 1167 &chan->info_mask_shared_by_type); 1168 if (ret < 0) 1169 return ret; 1170 attrcount += ret; 1171 1172 ret = iio_device_add_info_mask_type_avail(indio_dev, chan, 1173 IIO_SHARED_BY_TYPE, 1174 &chan-> 1175 info_mask_shared_by_type_available); 1176 if (ret < 0) 1177 return ret; 1178 attrcount += ret; 1179 1180 ret = iio_device_add_info_mask_type(indio_dev, chan, 1181 IIO_SHARED_BY_DIR, 1182 &chan->info_mask_shared_by_dir); 1183 if (ret < 0) 1184 return ret; 1185 attrcount += ret; 1186 1187 ret = iio_device_add_info_mask_type_avail(indio_dev, chan, 1188 IIO_SHARED_BY_DIR, 1189 &chan->info_mask_shared_by_dir_available); 1190 if (ret < 0) 1191 return ret; 1192 attrcount += ret; 1193 1194 ret = iio_device_add_info_mask_type(indio_dev, chan, 1195 IIO_SHARED_BY_ALL, 1196 &chan->info_mask_shared_by_all); 1197 if (ret < 0) 1198 return ret; 1199 attrcount += ret; 1200 1201 ret = iio_device_add_info_mask_type_avail(indio_dev, chan, 1202 IIO_SHARED_BY_ALL, 1203 &chan->info_mask_shared_by_all_available); 1204 if (ret < 0) 1205 return ret; 1206 attrcount += ret; 1207 1208 if (chan->ext_info) { 1209 unsigned int i = 0; 1210 for (ext_info = chan->ext_info; ext_info->name; ext_info++) { 1211 ret = __iio_add_chan_devattr(ext_info->name, 1212 chan, 1213 ext_info->read ? 1214 &iio_read_channel_ext_info : NULL, 1215 ext_info->write ? 1216 &iio_write_channel_ext_info : NULL, 1217 i, 1218 ext_info->shared, 1219 &indio_dev->dev, 1220 &indio_dev->channel_attr_list); 1221 i++; 1222 if (ret == -EBUSY && ext_info->shared) 1223 continue; 1224 1225 if (ret) 1226 return ret; 1227 1228 attrcount++; 1229 } 1230 } 1231 1232 return attrcount; 1233 } 1234 1235 /** 1236 * iio_free_chan_devattr_list() - Free a list of IIO device attributes 1237 * @attr_list: List of IIO device attributes 1238 * 1239 * This function frees the memory allocated for each of the IIO device 1240 * attributes in the list. 1241 */ 1242 void iio_free_chan_devattr_list(struct list_head *attr_list) 1243 { 1244 struct iio_dev_attr *p, *n; 1245 1246 list_for_each_entry_safe(p, n, attr_list, l) { 1247 kfree(p->dev_attr.attr.name); 1248 list_del(&p->l); 1249 kfree(p); 1250 } 1251 } 1252 1253 static ssize_t iio_show_dev_name(struct device *dev, 1254 struct device_attribute *attr, 1255 char *buf) 1256 { 1257 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 1258 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); 1259 } 1260 1261 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); 1262 1263 static ssize_t iio_show_timestamp_clock(struct device *dev, 1264 struct device_attribute *attr, 1265 char *buf) 1266 { 1267 const struct iio_dev *indio_dev = dev_to_iio_dev(dev); 1268 const clockid_t clk = iio_device_get_clock(indio_dev); 1269 const char *name; 1270 ssize_t sz; 1271 1272 switch (clk) { 1273 case CLOCK_REALTIME: 1274 name = "realtime\n"; 1275 sz = sizeof("realtime\n"); 1276 break; 1277 case CLOCK_MONOTONIC: 1278 name = "monotonic\n"; 1279 sz = sizeof("monotonic\n"); 1280 break; 1281 case CLOCK_MONOTONIC_RAW: 1282 name = "monotonic_raw\n"; 1283 sz = sizeof("monotonic_raw\n"); 1284 break; 1285 case CLOCK_REALTIME_COARSE: 1286 name = "realtime_coarse\n"; 1287 sz = sizeof("realtime_coarse\n"); 1288 break; 1289 case CLOCK_MONOTONIC_COARSE: 1290 name = "monotonic_coarse\n"; 1291 sz = sizeof("monotonic_coarse\n"); 1292 break; 1293 case CLOCK_BOOTTIME: 1294 name = "boottime\n"; 1295 sz = sizeof("boottime\n"); 1296 break; 1297 case CLOCK_TAI: 1298 name = "tai\n"; 1299 sz = sizeof("tai\n"); 1300 break; 1301 default: 1302 BUG(); 1303 } 1304 1305 memcpy(buf, name, sz); 1306 return sz; 1307 } 1308 1309 static ssize_t iio_store_timestamp_clock(struct device *dev, 1310 struct device_attribute *attr, 1311 const char *buf, size_t len) 1312 { 1313 clockid_t clk; 1314 int ret; 1315 1316 if (sysfs_streq(buf, "realtime")) 1317 clk = CLOCK_REALTIME; 1318 else if (sysfs_streq(buf, "monotonic")) 1319 clk = CLOCK_MONOTONIC; 1320 else if (sysfs_streq(buf, "monotonic_raw")) 1321 clk = CLOCK_MONOTONIC_RAW; 1322 else if (sysfs_streq(buf, "realtime_coarse")) 1323 clk = CLOCK_REALTIME_COARSE; 1324 else if (sysfs_streq(buf, "monotonic_coarse")) 1325 clk = CLOCK_MONOTONIC_COARSE; 1326 else if (sysfs_streq(buf, "boottime")) 1327 clk = CLOCK_BOOTTIME; 1328 else if (sysfs_streq(buf, "tai")) 1329 clk = CLOCK_TAI; 1330 else 1331 return -EINVAL; 1332 1333 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); 1334 if (ret) 1335 return ret; 1336 1337 return len; 1338 } 1339 1340 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, 1341 iio_show_timestamp_clock, iio_store_timestamp_clock); 1342 1343 static int iio_device_register_sysfs(struct iio_dev *indio_dev) 1344 { 1345 int i, ret = 0, attrcount, attrn, attrcount_orig = 0; 1346 struct iio_dev_attr *p; 1347 struct attribute **attr, *clk = NULL; 1348 1349 /* First count elements in any existing group */ 1350 if (indio_dev->info->attrs) { 1351 attr = indio_dev->info->attrs->attrs; 1352 while (*attr++ != NULL) 1353 attrcount_orig++; 1354 } 1355 attrcount = attrcount_orig; 1356 /* 1357 * New channel registration method - relies on the fact a group does 1358 * not need to be initialized if its name is NULL. 1359 */ 1360 if (indio_dev->channels) 1361 for (i = 0; i < indio_dev->num_channels; i++) { 1362 const struct iio_chan_spec *chan = 1363 &indio_dev->channels[i]; 1364 1365 if (chan->type == IIO_TIMESTAMP) 1366 clk = &dev_attr_current_timestamp_clock.attr; 1367 1368 ret = iio_device_add_channel_sysfs(indio_dev, chan); 1369 if (ret < 0) 1370 goto error_clear_attrs; 1371 attrcount += ret; 1372 } 1373 1374 if (indio_dev->event_interface) 1375 clk = &dev_attr_current_timestamp_clock.attr; 1376 1377 if (indio_dev->name) 1378 attrcount++; 1379 if (clk) 1380 attrcount++; 1381 1382 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, 1383 sizeof(indio_dev->chan_attr_group.attrs[0]), 1384 GFP_KERNEL); 1385 if (indio_dev->chan_attr_group.attrs == NULL) { 1386 ret = -ENOMEM; 1387 goto error_clear_attrs; 1388 } 1389 /* Copy across original attributes */ 1390 if (indio_dev->info->attrs) 1391 memcpy(indio_dev->chan_attr_group.attrs, 1392 indio_dev->info->attrs->attrs, 1393 sizeof(indio_dev->chan_attr_group.attrs[0]) 1394 *attrcount_orig); 1395 attrn = attrcount_orig; 1396 /* Add all elements from the list. */ 1397 list_for_each_entry(p, &indio_dev->channel_attr_list, l) 1398 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; 1399 if (indio_dev->name) 1400 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; 1401 if (clk) 1402 indio_dev->chan_attr_group.attrs[attrn++] = clk; 1403 1404 indio_dev->groups[indio_dev->groupcounter++] = 1405 &indio_dev->chan_attr_group; 1406 1407 return 0; 1408 1409 error_clear_attrs: 1410 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 1411 1412 return ret; 1413 } 1414 1415 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) 1416 { 1417 1418 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 1419 kfree(indio_dev->chan_attr_group.attrs); 1420 indio_dev->chan_attr_group.attrs = NULL; 1421 } 1422 1423 static void iio_dev_release(struct device *device) 1424 { 1425 struct iio_dev *indio_dev = dev_to_iio_dev(device); 1426 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) 1427 iio_device_unregister_trigger_consumer(indio_dev); 1428 iio_device_unregister_eventset(indio_dev); 1429 iio_device_unregister_sysfs(indio_dev); 1430 1431 iio_buffer_put(indio_dev->buffer); 1432 1433 ida_simple_remove(&iio_ida, indio_dev->id); 1434 kfree(indio_dev); 1435 } 1436 1437 struct device_type iio_device_type = { 1438 .name = "iio_device", 1439 .release = iio_dev_release, 1440 }; 1441 1442 /** 1443 * iio_device_alloc() - allocate an iio_dev from a driver 1444 * @sizeof_priv: Space to allocate for private structure. 1445 **/ 1446 struct iio_dev *iio_device_alloc(int sizeof_priv) 1447 { 1448 struct iio_dev *dev; 1449 size_t alloc_size; 1450 1451 alloc_size = sizeof(struct iio_dev); 1452 if (sizeof_priv) { 1453 alloc_size = ALIGN(alloc_size, IIO_ALIGN); 1454 alloc_size += sizeof_priv; 1455 } 1456 /* ensure 32-byte alignment of whole construct ? */ 1457 alloc_size += IIO_ALIGN - 1; 1458 1459 dev = kzalloc(alloc_size, GFP_KERNEL); 1460 1461 if (dev) { 1462 dev->dev.groups = dev->groups; 1463 dev->dev.type = &iio_device_type; 1464 dev->dev.bus = &iio_bus_type; 1465 device_initialize(&dev->dev); 1466 dev_set_drvdata(&dev->dev, (void *)dev); 1467 mutex_init(&dev->mlock); 1468 mutex_init(&dev->info_exist_lock); 1469 INIT_LIST_HEAD(&dev->channel_attr_list); 1470 1471 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); 1472 if (dev->id < 0) { 1473 /* cannot use a dev_err as the name isn't available */ 1474 pr_err("failed to get device id\n"); 1475 kfree(dev); 1476 return NULL; 1477 } 1478 dev_set_name(&dev->dev, "iio:device%d", dev->id); 1479 INIT_LIST_HEAD(&dev->buffer_list); 1480 } 1481 1482 return dev; 1483 } 1484 EXPORT_SYMBOL(iio_device_alloc); 1485 1486 /** 1487 * iio_device_free() - free an iio_dev from a driver 1488 * @dev: the iio_dev associated with the device 1489 **/ 1490 void iio_device_free(struct iio_dev *dev) 1491 { 1492 if (dev) 1493 put_device(&dev->dev); 1494 } 1495 EXPORT_SYMBOL(iio_device_free); 1496 1497 static void devm_iio_device_release(struct device *dev, void *res) 1498 { 1499 iio_device_free(*(struct iio_dev **)res); 1500 } 1501 1502 int devm_iio_device_match(struct device *dev, void *res, void *data) 1503 { 1504 struct iio_dev **r = res; 1505 if (!r || !*r) { 1506 WARN_ON(!r || !*r); 1507 return 0; 1508 } 1509 return *r == data; 1510 } 1511 EXPORT_SYMBOL_GPL(devm_iio_device_match); 1512 1513 /** 1514 * devm_iio_device_alloc - Resource-managed iio_device_alloc() 1515 * @dev: Device to allocate iio_dev for 1516 * @sizeof_priv: Space to allocate for private structure. 1517 * 1518 * Managed iio_device_alloc. iio_dev allocated with this function is 1519 * automatically freed on driver detach. 1520 * 1521 * If an iio_dev allocated with this function needs to be freed separately, 1522 * devm_iio_device_free() must be used. 1523 * 1524 * RETURNS: 1525 * Pointer to allocated iio_dev on success, NULL on failure. 1526 */ 1527 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) 1528 { 1529 struct iio_dev **ptr, *iio_dev; 1530 1531 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), 1532 GFP_KERNEL); 1533 if (!ptr) 1534 return NULL; 1535 1536 iio_dev = iio_device_alloc(sizeof_priv); 1537 if (iio_dev) { 1538 *ptr = iio_dev; 1539 devres_add(dev, ptr); 1540 } else { 1541 devres_free(ptr); 1542 } 1543 1544 return iio_dev; 1545 } 1546 EXPORT_SYMBOL_GPL(devm_iio_device_alloc); 1547 1548 /** 1549 * devm_iio_device_free - Resource-managed iio_device_free() 1550 * @dev: Device this iio_dev belongs to 1551 * @iio_dev: the iio_dev associated with the device 1552 * 1553 * Free iio_dev allocated with devm_iio_device_alloc(). 1554 */ 1555 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) 1556 { 1557 int rc; 1558 1559 rc = devres_release(dev, devm_iio_device_release, 1560 devm_iio_device_match, iio_dev); 1561 WARN_ON(rc); 1562 } 1563 EXPORT_SYMBOL_GPL(devm_iio_device_free); 1564 1565 /** 1566 * iio_chrdev_open() - chrdev file open for buffer access and ioctls 1567 * @inode: Inode structure for identifying the device in the file system 1568 * @filp: File structure for iio device used to keep and later access 1569 * private data 1570 * 1571 * Return: 0 on success or -EBUSY if the device is already opened 1572 **/ 1573 static int iio_chrdev_open(struct inode *inode, struct file *filp) 1574 { 1575 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1576 struct iio_dev, chrdev); 1577 1578 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) 1579 return -EBUSY; 1580 1581 iio_device_get(indio_dev); 1582 1583 filp->private_data = indio_dev; 1584 1585 return 0; 1586 } 1587 1588 /** 1589 * iio_chrdev_release() - chrdev file close buffer access and ioctls 1590 * @inode: Inode structure pointer for the char device 1591 * @filp: File structure pointer for the char device 1592 * 1593 * Return: 0 for successful release 1594 */ 1595 static int iio_chrdev_release(struct inode *inode, struct file *filp) 1596 { 1597 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1598 struct iio_dev, chrdev); 1599 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); 1600 iio_device_put(indio_dev); 1601 1602 return 0; 1603 } 1604 1605 /* Somewhat of a cross file organization violation - ioctls here are actually 1606 * event related */ 1607 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1608 { 1609 struct iio_dev *indio_dev = filp->private_data; 1610 int __user *ip = (int __user *)arg; 1611 int fd; 1612 1613 if (!indio_dev->info) 1614 return -ENODEV; 1615 1616 if (cmd == IIO_GET_EVENT_FD_IOCTL) { 1617 fd = iio_event_getfd(indio_dev); 1618 if (fd < 0) 1619 return fd; 1620 if (copy_to_user(ip, &fd, sizeof(fd))) 1621 return -EFAULT; 1622 return 0; 1623 } 1624 return -EINVAL; 1625 } 1626 1627 static const struct file_operations iio_buffer_fileops = { 1628 .read = iio_buffer_read_first_n_outer_addr, 1629 .release = iio_chrdev_release, 1630 .open = iio_chrdev_open, 1631 .poll = iio_buffer_poll_addr, 1632 .owner = THIS_MODULE, 1633 .llseek = noop_llseek, 1634 .unlocked_ioctl = iio_ioctl, 1635 .compat_ioctl = iio_ioctl, 1636 }; 1637 1638 static int iio_check_unique_scan_index(struct iio_dev *indio_dev) 1639 { 1640 int i, j; 1641 const struct iio_chan_spec *channels = indio_dev->channels; 1642 1643 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) 1644 return 0; 1645 1646 for (i = 0; i < indio_dev->num_channels - 1; i++) { 1647 if (channels[i].scan_index < 0) 1648 continue; 1649 for (j = i + 1; j < indio_dev->num_channels; j++) 1650 if (channels[i].scan_index == channels[j].scan_index) { 1651 dev_err(&indio_dev->dev, 1652 "Duplicate scan index %d\n", 1653 channels[i].scan_index); 1654 return -EINVAL; 1655 } 1656 } 1657 1658 return 0; 1659 } 1660 1661 static const struct iio_buffer_setup_ops noop_ring_setup_ops; 1662 1663 /** 1664 * iio_device_register() - register a device with the IIO subsystem 1665 * @indio_dev: Device structure filled by the device driver 1666 **/ 1667 int iio_device_register(struct iio_dev *indio_dev) 1668 { 1669 int ret; 1670 1671 /* If the calling driver did not initialize of_node, do it here */ 1672 if (!indio_dev->dev.of_node && indio_dev->dev.parent) 1673 indio_dev->dev.of_node = indio_dev->dev.parent->of_node; 1674 1675 ret = iio_check_unique_scan_index(indio_dev); 1676 if (ret < 0) 1677 return ret; 1678 1679 /* configure elements for the chrdev */ 1680 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); 1681 1682 ret = iio_device_register_debugfs(indio_dev); 1683 if (ret) { 1684 dev_err(indio_dev->dev.parent, 1685 "Failed to register debugfs interfaces\n"); 1686 return ret; 1687 } 1688 1689 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); 1690 if (ret) { 1691 dev_err(indio_dev->dev.parent, 1692 "Failed to create buffer sysfs interfaces\n"); 1693 goto error_unreg_debugfs; 1694 } 1695 1696 ret = iio_device_register_sysfs(indio_dev); 1697 if (ret) { 1698 dev_err(indio_dev->dev.parent, 1699 "Failed to register sysfs interfaces\n"); 1700 goto error_buffer_free_sysfs; 1701 } 1702 ret = iio_device_register_eventset(indio_dev); 1703 if (ret) { 1704 dev_err(indio_dev->dev.parent, 1705 "Failed to register event set\n"); 1706 goto error_free_sysfs; 1707 } 1708 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) 1709 iio_device_register_trigger_consumer(indio_dev); 1710 1711 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && 1712 indio_dev->setup_ops == NULL) 1713 indio_dev->setup_ops = &noop_ring_setup_ops; 1714 1715 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); 1716 indio_dev->chrdev.owner = indio_dev->info->driver_module; 1717 1718 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); 1719 if (ret < 0) 1720 goto error_unreg_eventset; 1721 1722 return 0; 1723 1724 error_unreg_eventset: 1725 iio_device_unregister_eventset(indio_dev); 1726 error_free_sysfs: 1727 iio_device_unregister_sysfs(indio_dev); 1728 error_buffer_free_sysfs: 1729 iio_buffer_free_sysfs_and_mask(indio_dev); 1730 error_unreg_debugfs: 1731 iio_device_unregister_debugfs(indio_dev); 1732 return ret; 1733 } 1734 EXPORT_SYMBOL(iio_device_register); 1735 1736 /** 1737 * iio_device_unregister() - unregister a device from the IIO subsystem 1738 * @indio_dev: Device structure representing the device. 1739 **/ 1740 void iio_device_unregister(struct iio_dev *indio_dev) 1741 { 1742 mutex_lock(&indio_dev->info_exist_lock); 1743 1744 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev); 1745 1746 iio_device_unregister_debugfs(indio_dev); 1747 1748 iio_disable_all_buffers(indio_dev); 1749 1750 indio_dev->info = NULL; 1751 1752 iio_device_wakeup_eventset(indio_dev); 1753 iio_buffer_wakeup_poll(indio_dev); 1754 1755 mutex_unlock(&indio_dev->info_exist_lock); 1756 1757 iio_buffer_free_sysfs_and_mask(indio_dev); 1758 } 1759 EXPORT_SYMBOL(iio_device_unregister); 1760 1761 static void devm_iio_device_unreg(struct device *dev, void *res) 1762 { 1763 iio_device_unregister(*(struct iio_dev **)res); 1764 } 1765 1766 /** 1767 * devm_iio_device_register - Resource-managed iio_device_register() 1768 * @dev: Device to allocate iio_dev for 1769 * @indio_dev: Device structure filled by the device driver 1770 * 1771 * Managed iio_device_register. The IIO device registered with this 1772 * function is automatically unregistered on driver detach. This function 1773 * calls iio_device_register() internally. Refer to that function for more 1774 * information. 1775 * 1776 * If an iio_dev registered with this function needs to be unregistered 1777 * separately, devm_iio_device_unregister() must be used. 1778 * 1779 * RETURNS: 1780 * 0 on success, negative error number on failure. 1781 */ 1782 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) 1783 { 1784 struct iio_dev **ptr; 1785 int ret; 1786 1787 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); 1788 if (!ptr) 1789 return -ENOMEM; 1790 1791 *ptr = indio_dev; 1792 ret = iio_device_register(indio_dev); 1793 if (!ret) 1794 devres_add(dev, ptr); 1795 else 1796 devres_free(ptr); 1797 1798 return ret; 1799 } 1800 EXPORT_SYMBOL_GPL(devm_iio_device_register); 1801 1802 /** 1803 * devm_iio_device_unregister - Resource-managed iio_device_unregister() 1804 * @dev: Device this iio_dev belongs to 1805 * @indio_dev: the iio_dev associated with the device 1806 * 1807 * Unregister iio_dev registered with devm_iio_device_register(). 1808 */ 1809 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) 1810 { 1811 int rc; 1812 1813 rc = devres_release(dev, devm_iio_device_unreg, 1814 devm_iio_device_match, indio_dev); 1815 WARN_ON(rc); 1816 } 1817 EXPORT_SYMBOL_GPL(devm_iio_device_unregister); 1818 1819 /** 1820 * iio_device_claim_direct_mode - Keep device in direct mode 1821 * @indio_dev: the iio_dev associated with the device 1822 * 1823 * If the device is in direct mode it is guaranteed to stay 1824 * that way until iio_device_release_direct_mode() is called. 1825 * 1826 * Use with iio_device_release_direct_mode() 1827 * 1828 * Returns: 0 on success, -EBUSY on failure 1829 */ 1830 int iio_device_claim_direct_mode(struct iio_dev *indio_dev) 1831 { 1832 mutex_lock(&indio_dev->mlock); 1833 1834 if (iio_buffer_enabled(indio_dev)) { 1835 mutex_unlock(&indio_dev->mlock); 1836 return -EBUSY; 1837 } 1838 return 0; 1839 } 1840 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); 1841 1842 /** 1843 * iio_device_release_direct_mode - releases claim on direct mode 1844 * @indio_dev: the iio_dev associated with the device 1845 * 1846 * Release the claim. Device is no longer guaranteed to stay 1847 * in direct mode. 1848 * 1849 * Use with iio_device_claim_direct_mode() 1850 */ 1851 void iio_device_release_direct_mode(struct iio_dev *indio_dev) 1852 { 1853 mutex_unlock(&indio_dev->mlock); 1854 } 1855 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); 1856 1857 subsys_initcall(iio_init); 1858 module_exit(iio_exit); 1859 1860 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); 1861 MODULE_DESCRIPTION("Industrial I/O core"); 1862 MODULE_LICENSE("GPL"); 1863