industrialio-core.c 46.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11
/* The industrial I/O core
 *
 * Copyright (c) 2008 Jonathan Cameron
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * Based on elements of hwmon and input subsystems.
 */

12 13
#define pr_fmt(fmt) "iio-core: " fmt

14 15 16 17 18 19 20 21
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/fs.h>
#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 33
#include <linux/iio/sysfs.h>
#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 45
	.name = "iio",
};
46
EXPORT_SYMBOL(iio_bus_type);
47

48 49
static struct dentry *iio_debugfs_dentry;

50 51 52 53 54
static const char * const iio_direction[] = {
	[0] = "in",
	[1] = "out",
};

55
static const char * const iio_chan_type_name_spec[] = {
56
	[IIO_VOLTAGE] = "voltage",
57 58
	[IIO_CURRENT] = "current",
	[IIO_POWER] = "power",
59
	[IIO_ACCEL] = "accel",
60
	[IIO_ANGL_VEL] = "anglvel",
61
	[IIO_MAGN] = "magn",
62 63
	[IIO_LIGHT] = "illuminance",
	[IIO_INTENSITY] = "intensity",
64
	[IIO_PROXIMITY] = "proximity",
65
	[IIO_TEMP] = "temp",
66 67 68
	[IIO_INCLI] = "incli",
	[IIO_ROT] = "rot",
	[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 86
	[IIO_COUNT] = "count",
	[IIO_INDEX] = "index",
87
	[IIO_GRAVITY]  = "gravity",
88 89
};

90
static const char * const iio_modifier_names[] = {
91 92 93
	[IIO_MOD_X] = "x",
	[IIO_MOD_Y] = "y",
	[IIO_MOD_Z] = "z",
94 95 96 97 98 99 100 101
	[IIO_MOD_X_AND_Y] = "x&y",
	[IIO_MOD_X_AND_Z] = "x&z",
	[IIO_MOD_Y_AND_Z] = "y&z",
	[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
	[IIO_MOD_X_OR_Y] = "x|y",
	[IIO_MOD_X_OR_Z] = "x|z",
	[IIO_MOD_Y_OR_Z] = "y|z",
	[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",
104 105
	[IIO_MOD_LIGHT_BOTH] = "both",
	[IIO_MOD_LIGHT_IR] = "ir",
106 107 108 109
	[IIO_MOD_LIGHT_CLEAR] = "clear",
	[IIO_MOD_LIGHT_RED] = "red",
	[IIO_MOD_LIGHT_GREEN] = "green",
	[IIO_MOD_LIGHT_BLUE] = "blue",
110
	[IIO_MOD_LIGHT_UV] = "uv",
111
	[IIO_MOD_QUATERNION] = "quaternion",
112 113
	[IIO_MOD_TEMP_AMBIENT] = "ambient",
	[IIO_MOD_TEMP_OBJECT] = "object",
114 115 116 117
	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
	[IIO_MOD_NORTH_TRUE] = "from_north_true",
	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
118 119 120 121
	[IIO_MOD_RUNNING] = "running",
	[IIO_MOD_JOGGING] = "jogging",
	[IIO_MOD_WALKING] = "walking",
	[IIO_MOD_STILL] = "still",
122
	[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
123 124
	[IIO_MOD_I] = "i",
	[IIO_MOD_Q] = "q",
125 126
	[IIO_MOD_CO2] = "co2",
	[IIO_MOD_VOC] = "voc",
127 128 129 130
};

/* relies on pairs of these shared then separate */
static const char * const iio_chan_info_postfix[] = {
131 132
	[IIO_CHAN_INFO_RAW] = "raw",
	[IIO_CHAN_INFO_PROCESSED] = "input",
133 134 135 136 137 138 139 140
	[IIO_CHAN_INFO_SCALE] = "scale",
	[IIO_CHAN_INFO_OFFSET] = "offset",
	[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
	[IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
	[IIO_CHAN_INFO_PEAK] = "peak_raw",
	[IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
	[IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
	[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
141 142
	[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
	= "filter_low_pass_3db_frequency",
143 144
	[IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
	= "filter_high_pass_3db_frequency",
145
	[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
146 147
	[IIO_CHAN_INFO_FREQUENCY] = "frequency",
	[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",
154 155
	[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
156
	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
157
	[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
158 159
};

160 161 162 163 164
/**
 * iio_find_channel_from_si() - get channel from its scan index
 * @indio_dev:		device
 * @si:			scan index to match
 */
165 166 167 168 169 170 171 172 173 174 175
const struct iio_chan_spec
*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
{
	int i;

	for (i = 0; i < indio_dev->num_channels; i++)
		if (indio_dev->channels[i].scan_index == si)
			return &indio_dev->channels[i];
	return NULL;
}

176 177 178 179 180 181 182 183 184
/* This turns up an awful lot */
ssize_t iio_read_const_attr(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
}
EXPORT_SYMBOL(iio_read_const_attr);

185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
{
	int ret;
	const struct iio_event_interface *ev_int = indio_dev->event_interface;

	ret = mutex_lock_interruptible(&indio_dev->mlock);
	if (ret)
		return ret;
	if ((ev_int && iio_event_enabled(ev_int)) ||
	    iio_buffer_enabled(indio_dev)) {
		mutex_unlock(&indio_dev->mlock);
		return -EBUSY;
	}
	indio_dev->clock_id = clock_id;
	mutex_unlock(&indio_dev->mlock);

	return 0;
}

/**
 * iio_get_time_ns() - utility function to get a time stamp for events etc
 * @indio_dev: device
 */
s64 iio_get_time_ns(const struct iio_dev *indio_dev)
{
	struct timespec tp;

	switch (iio_device_get_clock(indio_dev)) {
	case CLOCK_REALTIME:
		ktime_get_real_ts(&tp);
		break;
	case CLOCK_MONOTONIC:
		ktime_get_ts(&tp);
		break;
	case CLOCK_MONOTONIC_RAW:
		getrawmonotonic(&tp);
		break;
	case CLOCK_REALTIME_COARSE:
		tp = current_kernel_time();
		break;
	case CLOCK_MONOTONIC_COARSE:
		tp = get_monotonic_coarse();
		break;
	case CLOCK_BOOTTIME:
		get_monotonic_boottime(&tp);
		break;
	case CLOCK_TAI:
		timekeeping_clocktai(&tp);
		break;
	default:
		BUG();
	}

	return timespec_to_ns(&tp);
}
EXPORT_SYMBOL(iio_get_time_ns);

/**
 * iio_get_time_res() - utility function to get time stamp clock resolution in
 *                      nano seconds.
 * @indio_dev: device
 */
unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
{
	switch (iio_device_get_clock(indio_dev)) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_MONOTONIC_RAW:
	case CLOCK_BOOTTIME:
	case CLOCK_TAI:
		return hrtimer_resolution;
	case CLOCK_REALTIME_COARSE:
	case CLOCK_MONOTONIC_COARSE:
		return LOW_RES_NSEC;
	default:
		BUG();
	}
}
EXPORT_SYMBOL(iio_get_time_res);

265 266 267 268
static int __init iio_init(void)
{
	int ret;

269 270
	/* Register sysfs bus */
	ret  = bus_register(&iio_bus_type);
271
	if (ret < 0) {
272
		pr_err("could not register bus type\n");
273 274 275
		goto error_nothing;
	}

276 277
	ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
	if (ret < 0) {
278
		pr_err("failed to allocate char dev region\n");
279
		goto error_unregister_bus_type;
280
	}
281

282 283
	iio_debugfs_dentry = debugfs_create_dir("iio", NULL);

284 285
	return 0;

286 287
error_unregister_bus_type:
	bus_unregister(&iio_bus_type);
288 289 290 291 292 293
error_nothing:
	return ret;
}

static void __exit iio_exit(void)
{
294 295
	if (iio_devt)
		unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
296
	bus_unregister(&iio_bus_type);
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
	debugfs_remove(iio_debugfs_dentry);
}

#if defined(CONFIG_DEBUG_FS)
static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	struct iio_dev *indio_dev = file->private_data;
	char buf[20];
	unsigned val = 0;
	ssize_t len;
	int ret;

	ret = indio_dev->info->debugfs_reg_access(indio_dev,
						  indio_dev->cached_reg_addr,
						  0, &val);
	if (ret)
		dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);

	len = snprintf(buf, sizeof(buf), "0x%X\n", val);

	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}

static ssize_t iio_debugfs_write_reg(struct file *file,
		     const char __user *userbuf, size_t count, loff_t *ppos)
{
	struct iio_dev *indio_dev = file->private_data;
	unsigned reg, val;
	char buf[80];
	int ret;

	count = min_t(size_t, count, (sizeof(buf)-1));
	if (copy_from_user(buf, userbuf, count))
		return -EFAULT;

	buf[count] = 0;

	ret = sscanf(buf, "%i %i", &reg, &val);

	switch (ret) {
	case 1:
		indio_dev->cached_reg_addr = reg;
		break;
	case 2:
		indio_dev->cached_reg_addr = reg;
		ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
							  val, NULL);
		if (ret) {
			dev_err(indio_dev->dev.parent, "%s: write failed\n",
				__func__);
			return ret;
		}
		break;
	default:
		return -EINVAL;
	}

	return count;
}

static const struct file_operations iio_debugfs_reg_fops = {
359
	.open = simple_open,
360 361 362 363 364 365 366
	.read = iio_debugfs_read_reg,
	.write = iio_debugfs_write_reg,
};

static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
{
	debugfs_remove_recursive(indio_dev->debugfs_dentry);
367 368
}

369 370 371 372 373 374 375
static int iio_device_register_debugfs(struct iio_dev *indio_dev)
{
	struct dentry *d;

	if (indio_dev->info->debugfs_reg_access == NULL)
		return 0;

376
	if (!iio_debugfs_dentry)
377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408
		return 0;

	indio_dev->debugfs_dentry =
		debugfs_create_dir(dev_name(&indio_dev->dev),
				   iio_debugfs_dentry);
	if (indio_dev->debugfs_dentry == NULL) {
		dev_warn(indio_dev->dev.parent,
			 "Failed to create debugfs directory\n");
		return -EFAULT;
	}

	d = debugfs_create_file("direct_reg_access", 0644,
				indio_dev->debugfs_dentry,
				indio_dev, &iio_debugfs_reg_fops);
	if (!d) {
		iio_device_unregister_debugfs(indio_dev);
		return -ENOMEM;
	}

	return 0;
}
#else
static int iio_device_register_debugfs(struct iio_dev *indio_dev)
{
	return 0;
}

static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_DEBUG_FS */

409 410 411 412
static ssize_t iio_read_channel_ext_info(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
413
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
414 415 416 417 418
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	const struct iio_chan_spec_ext_info *ext_info;

	ext_info = &this_attr->c->ext_info[this_attr->address];

419
	return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
420 421 422 423 424 425 426
}

static ssize_t iio_write_channel_ext_info(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf,
					 size_t len)
{
427
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
428 429 430 431 432
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	const struct iio_chan_spec_ext_info *ext_info;

	ext_info = &this_attr->c->ext_info[this_attr->address];

433 434
	return ext_info->write(indio_dev, ext_info->private,
			       this_attr->c, buf, len);
435 436
}

437 438 439 440 441 442 443 444 445 446 447
ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
	uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
{
	const struct iio_enum *e = (const struct iio_enum *)priv;
	unsigned int i;
	size_t len = 0;

	if (!e->num_items)
		return 0;

	for (i = 0; i < e->num_items; ++i)
448
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471

	/* replace last space with a newline */
	buf[len - 1] = '\n';

	return len;
}
EXPORT_SYMBOL_GPL(iio_enum_available_read);

ssize_t iio_enum_read(struct iio_dev *indio_dev,
	uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
{
	const struct iio_enum *e = (const struct iio_enum *)priv;
	int i;

	if (!e->get)
		return -EINVAL;

	i = e->get(indio_dev, chan);
	if (i < 0)
		return i;
	else if (i >= e->num_items)
		return -EINVAL;

472
	return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
}
EXPORT_SYMBOL_GPL(iio_enum_read);

ssize_t iio_enum_write(struct iio_dev *indio_dev,
	uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
	size_t len)
{
	const struct iio_enum *e = (const struct iio_enum *)priv;
	unsigned int i;
	int ret;

	if (!e->set)
		return -EINVAL;

	for (i = 0; i < e->num_items; i++) {
		if (sysfs_streq(buf, e->items[i]))
			break;
	}

	if (i == e->num_items)
		return -EINVAL;

	ret = e->set(indio_dev, chan, i);
	return ret ? ret : len;
}
EXPORT_SYMBOL_GPL(iio_enum_write);

500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
static const struct iio_mount_matrix iio_mount_idmatrix = {
	.rotation = {
		"1", "0", "0",
		"0", "1", "0",
		"0", "0", "1"
	}
};

static int iio_setup_mount_idmatrix(const struct device *dev,
				    struct iio_mount_matrix *matrix)
{
	*matrix = iio_mount_idmatrix;
	dev_info(dev, "mounting matrix not found: using identity...\n");
	return 0;
}

ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
			      const struct iio_chan_spec *chan, char *buf)
{
	const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
					      priv)(indio_dev, chan);

	if (IS_ERR(mtx))
		return PTR_ERR(mtx);

	if (!mtx)
		mtx = &iio_mount_idmatrix;

	return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
			mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
			mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
			mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
}
EXPORT_SYMBOL_GPL(iio_show_mount_matrix);

/**
 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
 *                              device-tree "mount-matrix" property
 * @dev:	device the mounting matrix property is assigned to
 * @propname:	device specific mounting matrix property name
 * @matrix:	where to store retrieved matrix
 *
 * If device is assigned no mounting matrix property, a default 3x3 identity
 * matrix will be filled in.
 *
 * Return: 0 if success, or a negative error code on failure.
 */
#ifdef CONFIG_OF
int of_iio_read_mount_matrix(const struct device *dev,
			     const char *propname,
			     struct iio_mount_matrix *matrix)
{
	if (dev->of_node) {
		int err = of_property_read_string_array(dev->of_node,
				propname, matrix->rotation,
				ARRAY_SIZE(iio_mount_idmatrix.rotation));

		if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
			return 0;

		if (err >= 0)
			/* Invalid number of matrix entries. */
			return -EINVAL;

		if (err != -EINVAL)
			/* Invalid matrix declaration format. */
			return err;
	}

	/* Matrix was not declared at all: fallback to identity. */
	return iio_setup_mount_idmatrix(dev, matrix);
}
#else
int of_iio_read_mount_matrix(const struct device *dev,
			     const char *propname,
			     struct iio_mount_matrix *matrix)
{
	return iio_setup_mount_idmatrix(dev, matrix);
}
#endif
EXPORT_SYMBOL(of_iio_read_mount_matrix);

582 583
static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
				  int size, const int *vals)
584
{
585
	unsigned long long tmp;
586
	int tmp0, tmp1;
587
	bool scale_db = false;
588

589
	switch (type) {
590
	case IIO_VAL_INT:
591
		return snprintf(buf, len, "%d", vals[0]);
592 593 594
	case IIO_VAL_INT_PLUS_MICRO_DB:
		scale_db = true;
	case IIO_VAL_INT_PLUS_MICRO:
595
		if (vals[1] < 0)
596 597
			return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
					-vals[1], scale_db ? " dB" : "");
598
		else
599 600
			return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
					scale_db ? " dB" : "");
601
	case IIO_VAL_INT_PLUS_NANO:
602
		if (vals[1] < 0)
603 604
			return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
					-vals[1]);
605
		else
606
			return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
607
	case IIO_VAL_FRACTIONAL:
608
		tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
609 610 611
		tmp1 = vals[1];
		tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
612
	case IIO_VAL_FRACTIONAL_LOG2:
613 614 615
		tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
		tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
616 617 618
	case IIO_VAL_INT_MULTIPLE:
	{
		int i;
619
		int l = 0;
620

621 622 623 624 625 626
		for (i = 0; i < size; ++i) {
			l += snprintf(&buf[l], len - l, "%d ", vals[i]);
			if (l >= len)
				break;
		}
		return l;
627
	}
628
	default:
629
		return 0;
630
	}
631
}
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656

/**
 * iio_format_value() - Formats a IIO value into its string representation
 * @buf:	The buffer to which the formatted value gets written
 *		which is assumed to be big enough (i.e. PAGE_SIZE).
 * @type:	One of the IIO_VAL_... constants. This decides how the val
 *		and val2 parameters are formatted.
 * @size:	Number of IIO value entries contained in vals
 * @vals:	Pointer to the values, exact meaning depends on the
 *		type parameter.
 *
 * Return: 0 by default, a negative number on failure or the
 *	   total number of characters written for a type that belongs
 *	   to the IIO_VAL_... constant.
 */
ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
{
	ssize_t len;

	len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
	if (len >= PAGE_SIZE - 1)
		return -EFBIG;

	return len + sprintf(buf + len, "\n");
}
657
EXPORT_SYMBOL_GPL(iio_format_value);
658

659 660 661 662 663 664
static ssize_t iio_read_channel_info(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
665 666 667 668 669 670 671 672 673 674 675 676
	int vals[INDIO_MAX_RAW_ELEMENTS];
	int ret;
	int val_len = 2;

	if (indio_dev->info->read_raw_multi)
		ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
							INDIO_MAX_RAW_ELEMENTS,
							vals, &val_len,
							this_attr->address);
	else
		ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
				    &vals[0], &vals[1], this_attr->address);
677 678 679 680

	if (ret < 0)
		return ret;

681
	return iio_format_value(buf, ret, val_len, vals);
682 683
}

684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
static ssize_t iio_format_avail_list(char *buf, const int *vals,
				     int type, int length)
{
	int i;
	ssize_t len = 0;

	switch (type) {
	case IIO_VAL_INT:
		for (i = 0; i < length; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 1, &vals[i]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < length - 1)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
		break;
	default:
		for (i = 0; i < length / 2; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 2, &vals[i * 2]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < length / 2 - 1)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
	}

	return len;
}

static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
{
	int i;
	ssize_t len;

	len = snprintf(buf, PAGE_SIZE, "[");
	switch (type) {
	case IIO_VAL_INT:
		for (i = 0; i < 3; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 1, &vals[i]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < 2)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"]\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
		break;
	default:
		for (i = 0; i < 3; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 2, &vals[i * 2]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < 2)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"]\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
	}

	return len;
}

static ssize_t iio_read_channel_info_avail(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
	const int *vals;
	int ret;
	int length;
	int type;

	ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
					  &vals, &type, &length,
					  this_attr->address);

	if (ret < 0)
		return ret;
	switch (ret) {
	case IIO_AVAIL_LIST:
		return iio_format_avail_list(buf, vals, type, length);
	case IIO_AVAIL_RANGE:
		return iio_format_avail_range(buf, vals, type);
	default:
		return -EINVAL;
	}
}

797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
/**
 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
 * @str: The string to parse
 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
 * @integer: The integer part of the number
 * @fract: The fractional part of the number
 *
 * Returns 0 on success, or a negative error code if the string could not be
 * parsed.
 */
int iio_str_to_fixpoint(const char *str, int fract_mult,
	int *integer, int *fract)
{
	int i = 0, f = 0;
	bool integer_part = true, negative = false;

813 814 815 816 817 818
	if (fract_mult == 0) {
		*fract = 0;

		return kstrtoint(str, 0, integer);
	}

819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
	if (str[0] == '-') {
		negative = true;
		str++;
	} else if (str[0] == '+') {
		str++;
	}

	while (*str) {
		if ('0' <= *str && *str <= '9') {
			if (integer_part) {
				i = i * 10 + *str - '0';
			} else {
				f += fract_mult * (*str - '0');
				fract_mult /= 10;
			}
		} else if (*str == '\n') {
			if (*(str + 1) == '\0')
				break;
			else
				return -EINVAL;
		} else if (*str == '.' && integer_part) {
			integer_part = false;
		} else {
			return -EINVAL;
		}
		str++;
	}

	if (negative) {
		if (i)
			i = -i;
		else
			f = -f;
	}

	*integer = i;
	*fract = f;

	return 0;
}
EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);

861 862 863 864 865
static ssize_t iio_write_channel_info(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf,
				      size_t len)
{
866
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
867
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
868 869
	int ret, fract_mult = 100000;
	int integer, fract;
870 871

	/* Assumes decimal - precision based on number of digits */
872
	if (!indio_dev->info->write_raw)
873
		return -EINVAL;
874 875 876 877

	if (indio_dev->info->write_raw_get_fmt)
		switch (indio_dev->info->write_raw_get_fmt(indio_dev,
			this_attr->c, this_attr->address)) {
878 879 880
		case IIO_VAL_INT:
			fract_mult = 0;
			break;
881 882 883 884 885 886 887 888 889 890
		case IIO_VAL_INT_PLUS_MICRO:
			fract_mult = 100000;
			break;
		case IIO_VAL_INT_PLUS_NANO:
			fract_mult = 100000000;
			break;
		default:
			return -EINVAL;
		}

891 892 893
	ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
	if (ret)
		return ret;
894

895
	ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
896
					 integer, fract, this_attr->address);
897 898 899 900 901 902
	if (ret)
		return ret;

	return len;
}

903
static
904 905 906 907 908 909 910 911 912 913
int __iio_device_attr_init(struct device_attribute *dev_attr,
			   const char *postfix,
			   struct iio_chan_spec const *chan,
			   ssize_t (*readfunc)(struct device *dev,
					       struct device_attribute *attr,
					       char *buf),
			   ssize_t (*writefunc)(struct device *dev,
						struct device_attribute *attr,
						const char *buf,
						size_t len),
914
			   enum iio_shared_by shared_by)
915
{
916
	int ret = 0;
917
	char *name = NULL;
918
	char *full_postfix;
919 920
	sysfs_attr_init(&dev_attr->attr);

921
	/* Build up postfix of <extend_name>_<modifier>_postfix */
922
	if (chan->modified && (shared_by == IIO_SEPARATE)) {
923 924 925 926 927 928 929 930 931 932 933 934
		if (chan->extend_name)
			full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
						 iio_modifier_names[chan
								    ->channel2],
						 chan->extend_name,
						 postfix);
		else
			full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
						 iio_modifier_names[chan
								    ->channel2],
						 postfix);
	} else {
935
		if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
936 937 938 939 940 941 942
			full_postfix = kstrdup(postfix, GFP_KERNEL);
		else
			full_postfix = kasprintf(GFP_KERNEL,
						 "%s_%s",
						 chan->extend_name,
						 postfix);
	}
943 944
	if (full_postfix == NULL)
		return -ENOMEM;
945

946
	if (chan->differential) { /* Differential can not have modifier */
947
		switch (shared_by) {
948
		case IIO_SHARED_BY_ALL:
949
			name = kasprintf(GFP_KERNEL, "%s", full_postfix);
950 951
			break;
		case IIO_SHARED_BY_DIR:
952
			name = kasprintf(GFP_KERNEL, "%s_%s",
953 954 955
						iio_direction[chan->output],
						full_postfix);
			break;
956
		case IIO_SHARED_BY_TYPE:
957
			name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
958 959 960 961
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    iio_chan_type_name_spec[chan->type],
					    full_postfix);
962 963 964
			break;
		case IIO_SEPARATE:
			if (!chan->indexed) {
965
				WARN(1, "Differential channels must be indexed\n");
966 967 968
				ret = -EINVAL;
				goto error_free_full_postfix;
			}
969
			name = kasprintf(GFP_KERNEL,
970
					    "%s_%s%d-%s%d_%s",
971 972 973 974 975 976
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    chan->channel,
					    iio_chan_type_name_spec[chan->type],
					    chan->channel2,
					    full_postfix);
977
			break;
978 979
		}
	} else { /* Single ended */
980
		switch (shared_by) {
981
		case IIO_SHARED_BY_ALL:
982
			name = kasprintf(GFP_KERNEL, "%s", full_postfix);
983 984
			break;
		case IIO_SHARED_BY_DIR:
985
			name = kasprintf(GFP_KERNEL, "%s_%s",
986 987 988
						iio_direction[chan->output],
						full_postfix);
			break;
989
		case IIO_SHARED_BY_TYPE:
990
			name = kasprintf(GFP_KERNEL, "%s_%s_%s",
991 992 993
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    full_postfix);
994 995 996 997
			break;

		case IIO_SEPARATE:
			if (chan->indexed)
998
				name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
999 1000 1001 1002 1003
						    iio_direction[chan->output],
						    iio_chan_type_name_spec[chan->type],
						    chan->channel,
						    full_postfix);
			else
1004
				name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1005 1006 1007 1008 1009
						    iio_direction[chan->output],
						    iio_chan_type_name_spec[chan->type],
						    full_postfix);
			break;
		}
1010
	}
1011
	if (name == NULL) {
1012 1013 1014
		ret = -ENOMEM;
		goto error_free_full_postfix;
	}
1015
	dev_attr->attr.name = name;
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025

	if (readfunc) {
		dev_attr->attr.mode |= S_IRUGO;
		dev_attr->show = readfunc;
	}

	if (writefunc) {
		dev_attr->attr.mode |= S_IWUSR;
		dev_attr->store = writefunc;
	}
1026

1027 1028
error_free_full_postfix:
	kfree(full_postfix);
1029

1030 1031 1032
	return ret;
}

1033
static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
{
	kfree(dev_attr->attr.name);
}

int __iio_add_chan_devattr(const char *postfix,
			   struct iio_chan_spec const *chan,
			   ssize_t (*readfunc)(struct device *dev,
					       struct device_attribute *attr,
					       char *buf),
			   ssize_t (*writefunc)(struct device *dev,
						struct device_attribute *attr,
						const char *buf,
						size_t len),
1047
			   u64 mask,
1048
			   enum iio_shared_by shared_by,
1049 1050 1051 1052 1053 1054
			   struct device *dev,
			   struct list_head *attr_list)
{
	int ret;
	struct iio_dev_attr *iio_attr, *t;

1055
	iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1056 1057
	if (iio_attr == NULL)
		return -ENOMEM;
1058 1059
	ret = __iio_device_attr_init(&iio_attr->dev_attr,
				     postfix, chan,
1060
				     readfunc, writefunc, shared_by);
1061 1062 1063 1064 1065 1066 1067
	if (ret)
		goto error_iio_dev_attr_free;
	iio_attr->c = chan;
	iio_attr->address = mask;
	list_for_each_entry(t, attr_list, l)
		if (strcmp(t->dev_attr.attr.name,
			   iio_attr->dev_attr.attr.name) == 0) {
1068
			if (shared_by == IIO_SEPARATE)
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
				dev_err(dev, "tried to double register : %s\n",
					t->dev_attr.attr.name);
			ret = -EBUSY;
			goto error_device_attr_deinit;
		}
	list_add(&iio_attr->l, attr_list);

	return 0;

error_device_attr_deinit:
	__iio_device_attr_deinit(&iio_attr->dev_attr);
error_iio_dev_attr_free:
	kfree(iio_attr);
	return ret;
}

1085 1086 1087 1088
static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
					 struct iio_chan_spec const *chan,
					 enum iio_shared_by shared_by,
					 const long *infomask)
1089
{
1090
	int i, ret, attrcount = 0;
1091

1092
	for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1093 1094
		if (i >= ARRAY_SIZE(iio_chan_info_postfix))
			return -EINVAL;
1095 1096 1097 1098 1099
		ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
					     chan,
					     &iio_read_channel_info,
					     &iio_write_channel_info,
					     i,
1100
					     shared_by,
1101 1102
					     &indio_dev->dev,
					     &indio_dev->channel_attr_list);
1103
		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1104
			continue;
1105 1106
		else if (ret < 0)
			return ret;
1107 1108
		attrcount++;
	}
1109

1110 1111 1112
	return attrcount;
}

1113 1114 1115 1116 1117 1118 1119 1120
static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
					       struct iio_chan_spec const *chan,
					       enum iio_shared_by shared_by,
					       const long *infomask)
{
	int i, ret, attrcount = 0;
	char *avail_postfix;

1121
	for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
		avail_postfix = kasprintf(GFP_KERNEL,
					  "%s_available",
					  iio_chan_info_postfix[i]);
		if (!avail_postfix)
			return -ENOMEM;

		ret = __iio_add_chan_devattr(avail_postfix,
					     chan,
					     &iio_read_channel_info_avail,
					     NULL,
					     i,
					     shared_by,
					     &indio_dev->dev,
					     &indio_dev->channel_attr_list);
		kfree(avail_postfix);
		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
			continue;
		else if (ret < 0)
			return ret;
		attrcount++;
	}

	return attrcount;
}

1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
					struct iio_chan_spec const *chan)
{
	int ret, attrcount = 0;
	const struct iio_chan_spec_ext_info *ext_info;

	if (chan->channel < 0)
		return 0;
	ret = iio_device_add_info_mask_type(indio_dev, chan,
					    IIO_SEPARATE,
					    &chan->info_mask_separate);
	if (ret < 0)
		return ret;
	attrcount += ret;

1162 1163 1164 1165 1166 1167 1168 1169
	ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
						  IIO_SEPARATE,
						  &chan->
						  info_mask_separate_available);
	if (ret < 0)
		return ret;
	attrcount += ret;

1170 1171 1172 1173 1174 1175 1176
	ret = iio_device_add_info_mask_type(indio_dev, chan,
					    IIO_SHARED_BY_TYPE,
					    &chan->info_mask_shared_by_type);
	if (ret < 0)
		return ret;
	attrcount += ret;

1177 1178 1179 1180 1181 1182 1183 1184
	ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
						  IIO_SHARED_BY_TYPE,
						  &chan->
						  info_mask_shared_by_type_available);
	if (ret < 0)
		return ret;
	attrcount += ret;

1185 1186 1187 1188 1189 1190 1191
	ret = iio_device_add_info_mask_type(indio_dev, chan,
					    IIO_SHARED_BY_DIR,
					    &chan->info_mask_shared_by_dir);
	if (ret < 0)
		return ret;
	attrcount += ret;

1192 1193 1194 1195 1196 1197 1198
	ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
						  IIO_SHARED_BY_DIR,
						  &chan->info_mask_shared_by_dir_available);
	if (ret < 0)
		return ret;
	attrcount += ret;

1199 1200 1201 1202 1203 1204 1205
	ret = iio_device_add_info_mask_type(indio_dev, chan,
					    IIO_SHARED_BY_ALL,
					    &chan->info_mask_shared_by_all);
	if (ret < 0)
		return ret;
	attrcount += ret;

1206 1207 1208 1209 1210 1211 1212
	ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
						  IIO_SHARED_BY_ALL,
						  &chan->info_mask_shared_by_all_available);
	if (ret < 0)
		return ret;
	attrcount += ret;

1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
	if (chan->ext_info) {
		unsigned int i = 0;
		for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
			ret = __iio_add_chan_devattr(ext_info->name,
					chan,
					ext_info->read ?
					    &iio_read_channel_ext_info : NULL,
					ext_info->write ?
					    &iio_write_channel_ext_info : NULL,
					i,
					ext_info->shared,
					&indio_dev->dev,
					&indio_dev->channel_attr_list);
			i++;
			if (ret == -EBUSY && ext_info->shared)
				continue;

			if (ret)
1231
				return ret;
1232 1233 1234 1235 1236

			attrcount++;
		}
	}

1237
	return attrcount;
1238 1239
}

1240 1241 1242 1243 1244
/**
 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
 * @attr_list: List of IIO device attributes
 *
 * This function frees the memory allocated for each of the IIO device
1245
 * attributes in the list.
1246 1247
 */
void iio_free_chan_devattr_list(struct list_head *attr_list)
1248
{
1249 1250 1251 1252
	struct iio_dev_attr *p, *n;

	list_for_each_entry_safe(p, n, attr_list, l) {
		kfree(p->dev_attr.attr.name);
1253
		list_del(&p->l);
1254 1255
		kfree(p);
	}
1256 1257
}

1258 1259 1260 1261
static ssize_t iio_show_dev_name(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
1262
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1263
	return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1264 1265 1266 1267
}

static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
static ssize_t iio_show_timestamp_clock(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	const clockid_t clk = iio_device_get_clock(indio_dev);
	const char *name;
	ssize_t sz;

	switch (clk) {
	case CLOCK_REALTIME:
		name = "realtime\n";
		sz = sizeof("realtime\n");
		break;
	case CLOCK_MONOTONIC:
		name = "monotonic\n";
		sz = sizeof("monotonic\n");
		break;
	case CLOCK_MONOTONIC_RAW:
		name = "monotonic_raw\n";
		sz = sizeof("monotonic_raw\n");
		break;
	case CLOCK_REALTIME_COARSE:
		name = "realtime_coarse\n";
		sz = sizeof("realtime_coarse\n");
		break;
	case CLOCK_MONOTONIC_COARSE:
		name = "monotonic_coarse\n";
		sz = sizeof("monotonic_coarse\n");
		break;
	case CLOCK_BOOTTIME:
		name = "boottime\n";
		sz = sizeof("boottime\n");
		break;
	case CLOCK_TAI:
		name = "tai\n";
		sz = sizeof("tai\n");
		break;
	default:
		BUG();
	}

	memcpy(buf, name, sz);
	return sz;
}

static ssize_t iio_store_timestamp_clock(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t len)
{
	clockid_t clk;
	int ret;

	if (sysfs_streq(buf, "realtime"))
		clk = CLOCK_REALTIME;
	else if (sysfs_streq(buf, "monotonic"))
		clk = CLOCK_MONOTONIC;
	else if (sysfs_streq(buf, "monotonic_raw"))
		clk = CLOCK_MONOTONIC_RAW;
	else if (sysfs_streq(buf, "realtime_coarse"))
		clk = CLOCK_REALTIME_COARSE;
	else if (sysfs_streq(buf, "monotonic_coarse"))
		clk = CLOCK_MONOTONIC_COARSE;
	else if (sysfs_streq(buf, "boottime"))
		clk = CLOCK_BOOTTIME;
	else if (sysfs_streq(buf, "tai"))
		clk = CLOCK_TAI;
	else
		return -EINVAL;

	ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
	if (ret)
		return ret;

	return len;
}

static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
		   iio_show_timestamp_clock, iio_store_timestamp_clock);

1348
static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1349
{
1350
	int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1351
	struct iio_dev_attr *p;
1352
	struct attribute **attr, *clk = NULL;
1353

1354
	/* First count elements in any existing group */
1355 1356
	if (indio_dev->info->attrs) {
		attr = indio_dev->info->attrs->attrs;
1357 1358
		while (*attr++ != NULL)
			attrcount_orig++;
1359
	}
1360
	attrcount = attrcount_orig;
1361 1362
	/*
	 * New channel registration method - relies on the fact a group does
Peter Meerwald's avatar
Peter Meerwald committed
1363
	 * not need to be initialized if its name is NULL.
1364
	 */
1365 1366
	if (indio_dev->channels)
		for (i = 0; i < indio_dev->num_channels; i++) {
1367 1368 1369 1370 1371 1372 1373
			const struct iio_chan_spec *chan =
				&indio_dev->channels[i];

			if (chan->type == IIO_TIMESTAMP)
				clk = &dev_attr_current_timestamp_clock.attr;

			ret = iio_device_add_channel_sysfs(indio_dev, chan);
1374 1375
			if (ret < 0)
				goto error_clear_attrs;
1376
			attrcount += ret;
1377
		}
1378

1379 1380 1381
	if (indio_dev->event_interface)
		clk = &dev_attr_current_timestamp_clock.attr;

1382
	if (indio_dev->name)
1383
		attrcount++;
1384 1385
	if (clk)
		attrcount++;
1386

1387 1388 1389
	indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
						   sizeof(indio_dev->chan_attr_group.attrs[0]),
						   GFP_KERNEL);
1390
	if (indio_dev->chan_attr_group.attrs == NULL) {
1391 1392
		ret = -ENOMEM;
		goto error_clear_attrs;
1393
	}
1394
	/* Copy across original attributes */
1395 1396 1397 1398
	if (indio_dev->info->attrs)
		memcpy(indio_dev->chan_attr_group.attrs,
		       indio_dev->info->attrs->attrs,
		       sizeof(indio_dev->chan_attr_group.attrs[0])
1399 1400 1401
		       *attrcount_orig);
	attrn = attrcount_orig;
	/* Add all elements from the list. */
1402 1403 1404 1405
	list_for_each_entry(p, &indio_dev->channel_attr_list, l)
		indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
	if (indio_dev->name)
		indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1406 1407
	if (clk)
		indio_dev->chan_attr_group.attrs[attrn++] = clk;
1408

1409 1410
	indio_dev->groups[indio_dev->groupcounter++] =
		&indio_dev->chan_attr_group;
1411

1412
	return 0;
1413

1414
error_clear_attrs:
1415
	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1416

1417
	return ret;
1418 1419
}

1420
static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1421
{
1422

1423
	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1424
	kfree(indio_dev->chan_attr_group.attrs);
1425
	indio_dev->chan_attr_group.attrs = NULL;
1426 1427 1428 1429
}

static void iio_dev_release(struct device *device)
{
1430
	struct iio_dev *indio_dev = dev_to_iio_dev(device);
1431
	if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1432 1433 1434
		iio_device_unregister_trigger_consumer(indio_dev);
	iio_device_unregister_eventset(indio_dev);
	iio_device_unregister_sysfs(indio_dev);
1435

1436 1437
	iio_buffer_put(indio_dev->buffer);

1438 1439
	ida_simple_remove(&iio_ida, indio_dev->id);
	kfree(indio_dev);
1440 1441
}

Guenter Roeck's avatar
Guenter Roeck committed
1442
struct device_type iio_device_type = {
1443 1444 1445 1446
	.name = "iio_device",
	.release = iio_dev_release,
};

1447 1448 1449 1450
/**
 * iio_device_alloc() - allocate an iio_dev from a driver
 * @sizeof_priv:	Space to allocate for private structure.
 **/
1451
struct iio_dev *iio_device_alloc(int sizeof_priv)
1452
{
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
	struct iio_dev *dev;
	size_t alloc_size;

	alloc_size = sizeof(struct iio_dev);
	if (sizeof_priv) {
		alloc_size = ALIGN(alloc_size, IIO_ALIGN);
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct ? */
	alloc_size += IIO_ALIGN - 1;

	dev = kzalloc(alloc_size, GFP_KERNEL);
1465 1466

	if (dev) {
1467
		dev->dev.groups = dev->groups;
Guenter Roeck's avatar
Guenter Roeck committed
1468
		dev->dev.type = &iio_device_type;
1469
		dev->dev.bus = &iio_bus_type;
1470 1471 1472
		device_initialize(&dev->dev);
		dev_set_drvdata(&dev->dev, (void *)dev);
		mutex_init(&dev->mlock);
1473
		mutex_init(&dev->info_exist_lock);
1474
		INIT_LIST_HEAD(&dev->channel_attr_list);
1475 1476 1477 1478

		dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
		if (dev->id < 0) {
			/* cannot use a dev_err as the name isn't available */
1479
			pr_err("failed to get device id\n");
1480 1481 1482 1483
			kfree(dev);
			return NULL;
		}
		dev_set_name(&dev->dev, "iio:device%d", dev->id);
1484
		INIT_LIST_HEAD(&dev->buffer_list);
1485 1486 1487 1488
	}

	return dev;
}
1489
EXPORT_SYMBOL(iio_device_alloc);
1490

1491 1492 1493 1494
/**
 * iio_device_free() - free an iio_dev from a driver
 * @dev:		the iio_dev associated with the device
 **/
1495
void iio_device_free(struct iio_dev *dev)
1496
{
1497 1498
	if (dev)
		put_device(&dev->dev);
1499
}
1500
EXPORT_SYMBOL(iio_device_free);
1501

1502 1503 1504 1505 1506
static void devm_iio_device_release(struct device *dev, void *res)
{
	iio_device_free(*(struct iio_dev **)res);
}

1507
int devm_iio_device_match(struct device *dev, void *res, void *data)
1508 1509 1510 1511 1512 1513 1514 1515
{
	struct iio_dev **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}
1516
EXPORT_SYMBOL_GPL(devm_iio_device_match);
1517

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
/**
 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
 * @dev:		Device to allocate iio_dev for
 * @sizeof_priv:	Space to allocate for private structure.
 *
 * Managed iio_device_alloc. iio_dev allocated with this function is
 * automatically freed on driver detach.
 *
 * If an iio_dev allocated with this function needs to be freed separately,
 * devm_iio_device_free() must be used.
 *
 * RETURNS:
 * Pointer to allocated iio_dev on success, NULL on failure.
 */
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
{
	struct iio_dev **ptr, *iio_dev;

	ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
			   GFP_KERNEL);
	if (!ptr)
		return NULL;

	iio_dev = iio_device_alloc(sizeof_priv);
	if (iio_dev) {
		*ptr = iio_dev;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return iio_dev;
}
EXPORT_SYMBOL_GPL(devm_iio_device_alloc);

1553 1554 1555 1556 1557 1558 1559
/**
 * devm_iio_device_free - Resource-managed iio_device_free()
 * @dev:		Device this iio_dev belongs to
 * @iio_dev:		the iio_dev associated with the device
 *
 * Free iio_dev allocated with devm_iio_device_alloc().
 */
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
{
	int rc;

	rc = devres_release(dev, devm_iio_device_release,
			    devm_iio_device_match, iio_dev);
	WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_device_free);

1570
/**
1571
 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1572 1573 1574 1575 1576
 * @inode:	Inode structure for identifying the device in the file system
 * @filp:	File structure for iio device used to keep and later access
 *		private data
 *
 * Return: 0 on success or -EBUSY if the device is already opened
1577 1578 1579
 **/
static int iio_chrdev_open(struct inode *inode, struct file *filp)
{
1580
	struct iio_dev *indio_dev = container_of(inode->i_cdev,
1581
						struct iio_dev, chrdev);
1582 1583 1584 1585

	if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
		return -EBUSY;

1586 1587
	iio_device_get(indio_dev);

1588
	filp->private_data = indio_dev;
1589

1590
	return 0;
1591 1592 1593
}

/**
1594
 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1595 1596 1597 1598 1599
 * @inode:	Inode structure pointer for the char device
 * @filp:	File structure pointer for the char device
 *
 * Return: 0 for successful release
 */
1600 1601
static int iio_chrdev_release(struct inode *inode, struct file *filp)
{
1602 1603 1604
	struct iio_dev *indio_dev = container_of(inode->i_cdev,
						struct iio_dev, chrdev);
	clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1605 1606
	iio_device_put(indio_dev);

1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617
	return 0;
}

/* Somewhat of a cross file organization violation - ioctls here are actually
 * event related */
static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct iio_dev *indio_dev = filp->private_data;
	int __user *ip = (int __user *)arg;
	int fd;

1618 1619 1620
	if (!indio_dev->info)
		return -ENODEV;

1621 1622
	if (cmd == IIO_GET_EVENT_FD_IOCTL) {
		fd = iio_event_getfd(indio_dev);
1623 1624
		if (fd < 0)
			return fd;
1625 1626 1627 1628 1629 1630 1631
		if (copy_to_user(ip, &fd, sizeof(fd)))
			return -EFAULT;
		return 0;
	}
	return -EINVAL;
}

1632 1633
static const struct file_operations iio_buffer_fileops = {
	.read = iio_buffer_read_first_n_outer_addr,
1634 1635
	.release = iio_chrdev_release,
	.open = iio_chrdev_open,
1636
	.poll = iio_buffer_poll_addr,
1637 1638 1639 1640 1641 1642
	.owner = THIS_MODULE,
	.llseek = noop_llseek,
	.unlocked_ioctl = iio_ioctl,
	.compat_ioctl = iio_ioctl,
};

1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
{
	int i, j;
	const struct iio_chan_spec *channels = indio_dev->channels;

	if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
		return 0;

	for (i = 0; i < indio_dev->num_channels - 1; i++) {
		if (channels[i].scan_index < 0)
			continue;
		for (j = i + 1; j < indio_dev->num_channels; j++)
			if (channels[i].scan_index == channels[j].scan_index) {
				dev_err(&indio_dev->dev,
					"Duplicate scan index %d\n",
					channels[i].scan_index);
				return -EINVAL;
			}
	}

	return 0;
}

1666 1667
static const struct iio_buffer_setup_ops noop_ring_setup_ops;

1668 1669 1670 1671
/**
 * iio_device_register() - register a device with the IIO subsystem
 * @indio_dev:		Device structure filled by the device driver
 **/
1672
int iio_device_register(struct iio_dev *indio_dev)
1673 1674 1675
{
	int ret;

Guenter Roeck's avatar
Guenter Roeck committed
1676 1677 1678 1679
	/* If the calling driver did not initialize of_node, do it here */
	if (!indio_dev->dev.of_node && indio_dev->dev.parent)
		indio_dev->dev.of_node = indio_dev->dev.parent->of_node;

1680 1681 1682 1683
	ret = iio_check_unique_scan_index(indio_dev);
	if (ret < 0)
		return ret;

1684
	/* configure elements for the chrdev */
1685
	indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1686

1687 1688 1689 1690
	ret = iio_device_register_debugfs(indio_dev);
	if (ret) {
		dev_err(indio_dev->dev.parent,
			"Failed to register debugfs interfaces\n");
1691
		return ret;
1692
	}
1693 1694 1695 1696 1697 1698 1699 1700

	ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
	if (ret) {
		dev_err(indio_dev->dev.parent,
			"Failed to create buffer sysfs interfaces\n");
		goto error_unreg_debugfs;
	}

1701
	ret = iio_device_register_sysfs(indio_dev);
1702
	if (ret) {
1703
		dev_err(indio_dev->dev.parent,
1704
			"Failed to register sysfs interfaces\n");
1705
		goto error_buffer_free_sysfs;
1706
	}
1707
	ret = iio_device_register_eventset(indio_dev);
1708
	if (ret) {
1709
		dev_err(indio_dev->dev.parent,
1710
			"Failed to register event set\n");
1711 1712
		goto error_free_sysfs;
	}
1713
	if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1714
		iio_device_register_trigger_consumer(indio_dev);
1715

1716 1717 1718 1719
	if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
		indio_dev->setup_ops == NULL)
		indio_dev->setup_ops = &noop_ring_setup_ops;

1720 1721
	cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
	indio_dev->chrdev.owner = indio_dev->info->driver_module;
1722
	indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
1723
	ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1724
	if (ret < 0)
1725
		goto error_unreg_eventset;
1726

1727 1728 1729 1730 1731 1732 1733
	ret = device_add(&indio_dev->dev);
	if (ret < 0)
		goto error_cdev_del;

	return 0;
error_cdev_del:
	cdev_del(&indio_dev->chrdev);
1734
error_unreg_eventset:
1735
	iio_device_unregister_eventset(indio_dev);
1736
error_free_sysfs:
1737
	iio_device_unregister_sysfs(indio_dev);
1738 1739
error_buffer_free_sysfs:
	iio_buffer_free_sysfs_and_mask(indio_dev);
1740 1741
error_unreg_debugfs:
	iio_device_unregister_debugfs(indio_dev);
1742 1743 1744 1745
	return ret;
}
EXPORT_SYMBOL(iio_device_register);

1746 1747 1748 1749
/**
 * iio_device_unregister() - unregister a device from the IIO subsystem
 * @indio_dev:		Device structure representing the device.
 **/
1750
void iio_device_unregister(struct iio_dev *indio_dev)
1751
{
1752
	mutex_lock(&indio_dev->info_exist_lock);
1753 1754 1755

	device_del(&indio_dev->dev);

1756 1757
	if (indio_dev->chrdev.dev)
		cdev_del(&indio_dev->chrdev);
1758
	iio_device_unregister_debugfs(indio_dev);
1759

1760 1761
	iio_disable_all_buffers(indio_dev);

1762
	indio_dev->info = NULL;
1763 1764 1765 1766

	iio_device_wakeup_eventset(indio_dev);
	iio_buffer_wakeup_poll(indio_dev);

1767
	mutex_unlock(&indio_dev->info_exist_lock);
1768 1769

	iio_buffer_free_sysfs_and_mask(indio_dev);
1770 1771
}
EXPORT_SYMBOL(iio_device_unregister);
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830

static void devm_iio_device_unreg(struct device *dev, void *res)
{
	iio_device_unregister(*(struct iio_dev **)res);
}

/**
 * devm_iio_device_register - Resource-managed iio_device_register()
 * @dev:	Device to allocate iio_dev for
 * @indio_dev:	Device structure filled by the device driver
 *
 * Managed iio_device_register.  The IIO device registered with this
 * function is automatically unregistered on driver detach. This function
 * calls iio_device_register() internally. Refer to that function for more
 * information.
 *
 * If an iio_dev registered with this function needs to be unregistered
 * separately, devm_iio_device_unregister() must be used.
 *
 * RETURNS:
 * 0 on success, negative error number on failure.
 */
int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
{
	struct iio_dev **ptr;
	int ret;

	ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return -ENOMEM;

	*ptr = indio_dev;
	ret = iio_device_register(indio_dev);
	if (!ret)
		devres_add(dev, ptr);
	else
		devres_free(ptr);

	return ret;
}
EXPORT_SYMBOL_GPL(devm_iio_device_register);

/**
 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
 * @dev:	Device this iio_dev belongs to
 * @indio_dev:	the iio_dev associated with the device
 *
 * Unregister iio_dev registered with devm_iio_device_register().
 */
void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
{
	int rc;

	rc = devres_release(dev, devm_iio_device_unreg,
			    devm_iio_device_match, indio_dev);
	WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_device_unregister);

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
/**
 * iio_device_claim_direct_mode - Keep device in direct mode
 * @indio_dev:	the iio_dev associated with the device
 *
 * If the device is in direct mode it is guaranteed to stay
 * that way until iio_device_release_direct_mode() is called.
 *
 * Use with iio_device_release_direct_mode()
 *
 * Returns: 0 on success, -EBUSY on failure
 */
int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
{
	mutex_lock(&indio_dev->mlock);

	if (iio_buffer_enabled(indio_dev)) {
		mutex_unlock(&indio_dev->mlock);
		return -EBUSY;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);

/**
 * iio_device_release_direct_mode - releases claim on direct mode
 * @indio_dev:	the iio_dev associated with the device
 *
 * Release the claim. Device is no longer guaranteed to stay
 * in direct mode.
 *
 * Use with iio_device_claim_direct_mode()
 */
void iio_device_release_direct_mode(struct iio_dev *indio_dev)
{
	mutex_unlock(&indio_dev->mlock);
}
EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);

1869 1870 1871
subsys_initcall(iio_init);
module_exit(iio_exit);

1872
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1873 1874
MODULE_DESCRIPTION("Industrial I/O core");
MODULE_LICENSE("GPL");