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Merge branch 'for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[deliverable/linux.git] / drivers / iio / industrialio-core.c
1 /* The industrial I/O core
2 *
3 * Copyright (c) 2008 Jonathan Cameron
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * Based on elements of hwmon and input subsystems.
10 */
11
12 #define pr_fmt(fmt) "iio-core: " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/idr.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/fs.h>
21 #include <linux/poll.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/cdev.h>
25 #include <linux/slab.h>
26 #include <linux/anon_inodes.h>
27 #include <linux/debugfs.h>
28 #include <linux/iio/iio.h>
29 #include "iio_core.h"
30 #include "iio_core_trigger.h"
31 #include <linux/iio/sysfs.h>
32 #include <linux/iio/events.h>
33 #include <linux/iio/buffer.h>
34
35 /* IDA to assign each registered device a unique id */
36 static DEFINE_IDA(iio_ida);
37
38 static dev_t iio_devt;
39
40 #define IIO_DEV_MAX 256
41 struct bus_type iio_bus_type = {
42 .name = "iio",
43 };
44 EXPORT_SYMBOL(iio_bus_type);
45
46 static struct dentry *iio_debugfs_dentry;
47
48 static const char * const iio_direction[] = {
49 [0] = "in",
50 [1] = "out",
51 };
52
53 static const char * const iio_chan_type_name_spec[] = {
54 [IIO_VOLTAGE] = "voltage",
55 [IIO_CURRENT] = "current",
56 [IIO_POWER] = "power",
57 [IIO_ACCEL] = "accel",
58 [IIO_ANGL_VEL] = "anglvel",
59 [IIO_MAGN] = "magn",
60 [IIO_LIGHT] = "illuminance",
61 [IIO_INTENSITY] = "intensity",
62 [IIO_PROXIMITY] = "proximity",
63 [IIO_TEMP] = "temp",
64 [IIO_INCLI] = "incli",
65 [IIO_ROT] = "rot",
66 [IIO_ANGL] = "angl",
67 [IIO_TIMESTAMP] = "timestamp",
68 [IIO_CAPACITANCE] = "capacitance",
69 [IIO_ALTVOLTAGE] = "altvoltage",
70 [IIO_CCT] = "cct",
71 [IIO_PRESSURE] = "pressure",
72 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
73 [IIO_ACTIVITY] = "activity",
74 [IIO_STEPS] = "steps",
75 [IIO_ENERGY] = "energy",
76 [IIO_DISTANCE] = "distance",
77 [IIO_VELOCITY] = "velocity",
78 };
79
80 static const char * const iio_modifier_names[] = {
81 [IIO_MOD_X] = "x",
82 [IIO_MOD_Y] = "y",
83 [IIO_MOD_Z] = "z",
84 [IIO_MOD_X_AND_Y] = "x&y",
85 [IIO_MOD_X_AND_Z] = "x&z",
86 [IIO_MOD_Y_AND_Z] = "y&z",
87 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
88 [IIO_MOD_X_OR_Y] = "x|y",
89 [IIO_MOD_X_OR_Z] = "x|z",
90 [IIO_MOD_Y_OR_Z] = "y|z",
91 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
92 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
93 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
94 [IIO_MOD_LIGHT_BOTH] = "both",
95 [IIO_MOD_LIGHT_IR] = "ir",
96 [IIO_MOD_LIGHT_CLEAR] = "clear",
97 [IIO_MOD_LIGHT_RED] = "red",
98 [IIO_MOD_LIGHT_GREEN] = "green",
99 [IIO_MOD_LIGHT_BLUE] = "blue",
100 [IIO_MOD_QUATERNION] = "quaternion",
101 [IIO_MOD_TEMP_AMBIENT] = "ambient",
102 [IIO_MOD_TEMP_OBJECT] = "object",
103 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
104 [IIO_MOD_NORTH_TRUE] = "from_north_true",
105 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
106 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
107 [IIO_MOD_RUNNING] = "running",
108 [IIO_MOD_JOGGING] = "jogging",
109 [IIO_MOD_WALKING] = "walking",
110 [IIO_MOD_STILL] = "still",
111 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
112 [IIO_MOD_I] = "i",
113 [IIO_MOD_Q] = "q",
114 };
115
116 /* relies on pairs of these shared then separate */
117 static const char * const iio_chan_info_postfix[] = {
118 [IIO_CHAN_INFO_RAW] = "raw",
119 [IIO_CHAN_INFO_PROCESSED] = "input",
120 [IIO_CHAN_INFO_SCALE] = "scale",
121 [IIO_CHAN_INFO_OFFSET] = "offset",
122 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
123 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
124 [IIO_CHAN_INFO_PEAK] = "peak_raw",
125 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
126 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
127 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
128 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
129 = "filter_low_pass_3db_frequency",
130 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
131 = "filter_high_pass_3db_frequency",
132 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
133 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
134 [IIO_CHAN_INFO_PHASE] = "phase",
135 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
136 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
137 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
138 [IIO_CHAN_INFO_ENABLE] = "en",
139 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
140 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
141 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
142 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
143 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
144 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
145 };
146
147 /**
148 * iio_find_channel_from_si() - get channel from its scan index
149 * @indio_dev: device
150 * @si: scan index to match
151 */
152 const struct iio_chan_spec
153 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
154 {
155 int i;
156
157 for (i = 0; i < indio_dev->num_channels; i++)
158 if (indio_dev->channels[i].scan_index == si)
159 return &indio_dev->channels[i];
160 return NULL;
161 }
162
163 /* This turns up an awful lot */
164 ssize_t iio_read_const_attr(struct device *dev,
165 struct device_attribute *attr,
166 char *buf)
167 {
168 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
169 }
170 EXPORT_SYMBOL(iio_read_const_attr);
171
172 static int __init iio_init(void)
173 {
174 int ret;
175
176 /* Register sysfs bus */
177 ret = bus_register(&iio_bus_type);
178 if (ret < 0) {
179 pr_err("could not register bus type\n");
180 goto error_nothing;
181 }
182
183 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
184 if (ret < 0) {
185 pr_err("failed to allocate char dev region\n");
186 goto error_unregister_bus_type;
187 }
188
189 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
190
191 return 0;
192
193 error_unregister_bus_type:
194 bus_unregister(&iio_bus_type);
195 error_nothing:
196 return ret;
197 }
198
199 static void __exit iio_exit(void)
200 {
201 if (iio_devt)
202 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
203 bus_unregister(&iio_bus_type);
204 debugfs_remove(iio_debugfs_dentry);
205 }
206
207 #if defined(CONFIG_DEBUG_FS)
208 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
209 size_t count, loff_t *ppos)
210 {
211 struct iio_dev *indio_dev = file->private_data;
212 char buf[20];
213 unsigned val = 0;
214 ssize_t len;
215 int ret;
216
217 ret = indio_dev->info->debugfs_reg_access(indio_dev,
218 indio_dev->cached_reg_addr,
219 0, &val);
220 if (ret)
221 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
222
223 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
224
225 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
226 }
227
228 static ssize_t iio_debugfs_write_reg(struct file *file,
229 const char __user *userbuf, size_t count, loff_t *ppos)
230 {
231 struct iio_dev *indio_dev = file->private_data;
232 unsigned reg, val;
233 char buf[80];
234 int ret;
235
236 count = min_t(size_t, count, (sizeof(buf)-1));
237 if (copy_from_user(buf, userbuf, count))
238 return -EFAULT;
239
240 buf[count] = 0;
241
242 ret = sscanf(buf, "%i %i", &reg, &val);
243
244 switch (ret) {
245 case 1:
246 indio_dev->cached_reg_addr = reg;
247 break;
248 case 2:
249 indio_dev->cached_reg_addr = reg;
250 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
251 val, NULL);
252 if (ret) {
253 dev_err(indio_dev->dev.parent, "%s: write failed\n",
254 __func__);
255 return ret;
256 }
257 break;
258 default:
259 return -EINVAL;
260 }
261
262 return count;
263 }
264
265 static const struct file_operations iio_debugfs_reg_fops = {
266 .open = simple_open,
267 .read = iio_debugfs_read_reg,
268 .write = iio_debugfs_write_reg,
269 };
270
271 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
272 {
273 debugfs_remove_recursive(indio_dev->debugfs_dentry);
274 }
275
276 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
277 {
278 struct dentry *d;
279
280 if (indio_dev->info->debugfs_reg_access == NULL)
281 return 0;
282
283 if (!iio_debugfs_dentry)
284 return 0;
285
286 indio_dev->debugfs_dentry =
287 debugfs_create_dir(dev_name(&indio_dev->dev),
288 iio_debugfs_dentry);
289 if (indio_dev->debugfs_dentry == NULL) {
290 dev_warn(indio_dev->dev.parent,
291 "Failed to create debugfs directory\n");
292 return -EFAULT;
293 }
294
295 d = debugfs_create_file("direct_reg_access", 0644,
296 indio_dev->debugfs_dentry,
297 indio_dev, &iio_debugfs_reg_fops);
298 if (!d) {
299 iio_device_unregister_debugfs(indio_dev);
300 return -ENOMEM;
301 }
302
303 return 0;
304 }
305 #else
306 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
307 {
308 return 0;
309 }
310
311 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
312 {
313 }
314 #endif /* CONFIG_DEBUG_FS */
315
316 static ssize_t iio_read_channel_ext_info(struct device *dev,
317 struct device_attribute *attr,
318 char *buf)
319 {
320 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
321 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
322 const struct iio_chan_spec_ext_info *ext_info;
323
324 ext_info = &this_attr->c->ext_info[this_attr->address];
325
326 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
327 }
328
329 static ssize_t iio_write_channel_ext_info(struct device *dev,
330 struct device_attribute *attr,
331 const char *buf,
332 size_t len)
333 {
334 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
335 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
336 const struct iio_chan_spec_ext_info *ext_info;
337
338 ext_info = &this_attr->c->ext_info[this_attr->address];
339
340 return ext_info->write(indio_dev, ext_info->private,
341 this_attr->c, buf, len);
342 }
343
344 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
345 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
346 {
347 const struct iio_enum *e = (const struct iio_enum *)priv;
348 unsigned int i;
349 size_t len = 0;
350
351 if (!e->num_items)
352 return 0;
353
354 for (i = 0; i < e->num_items; ++i)
355 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
356
357 /* replace last space with a newline */
358 buf[len - 1] = '\n';
359
360 return len;
361 }
362 EXPORT_SYMBOL_GPL(iio_enum_available_read);
363
364 ssize_t iio_enum_read(struct iio_dev *indio_dev,
365 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
366 {
367 const struct iio_enum *e = (const struct iio_enum *)priv;
368 int i;
369
370 if (!e->get)
371 return -EINVAL;
372
373 i = e->get(indio_dev, chan);
374 if (i < 0)
375 return i;
376 else if (i >= e->num_items)
377 return -EINVAL;
378
379 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
380 }
381 EXPORT_SYMBOL_GPL(iio_enum_read);
382
383 ssize_t iio_enum_write(struct iio_dev *indio_dev,
384 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
385 size_t len)
386 {
387 const struct iio_enum *e = (const struct iio_enum *)priv;
388 unsigned int i;
389 int ret;
390
391 if (!e->set)
392 return -EINVAL;
393
394 for (i = 0; i < e->num_items; i++) {
395 if (sysfs_streq(buf, e->items[i]))
396 break;
397 }
398
399 if (i == e->num_items)
400 return -EINVAL;
401
402 ret = e->set(indio_dev, chan, i);
403 return ret ? ret : len;
404 }
405 EXPORT_SYMBOL_GPL(iio_enum_write);
406
407 /**
408 * iio_format_value() - Formats a IIO value into its string representation
409 * @buf: The buffer to which the formatted value gets written
410 * @type: One of the IIO_VAL_... constants. This decides how the val
411 * and val2 parameters are formatted.
412 * @size: Number of IIO value entries contained in vals
413 * @vals: Pointer to the values, exact meaning depends on the
414 * type parameter.
415 *
416 * Return: 0 by default, a negative number on failure or the
417 * total number of characters written for a type that belongs
418 * to the IIO_VAL_... constant.
419 */
420 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
421 {
422 unsigned long long tmp;
423 bool scale_db = false;
424
425 switch (type) {
426 case IIO_VAL_INT:
427 return sprintf(buf, "%d\n", vals[0]);
428 case IIO_VAL_INT_PLUS_MICRO_DB:
429 scale_db = true;
430 case IIO_VAL_INT_PLUS_MICRO:
431 if (vals[1] < 0)
432 return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]),
433 -vals[1],
434 scale_db ? " dB" : "");
435 else
436 return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1],
437 scale_db ? " dB" : "");
438 case IIO_VAL_INT_PLUS_NANO:
439 if (vals[1] < 0)
440 return sprintf(buf, "-%ld.%09u\n", abs(vals[0]),
441 -vals[1]);
442 else
443 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
444 case IIO_VAL_FRACTIONAL:
445 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
446 vals[1] = do_div(tmp, 1000000000LL);
447 vals[0] = tmp;
448 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
449 case IIO_VAL_FRACTIONAL_LOG2:
450 tmp = (s64)vals[0] * 1000000000LL >> vals[1];
451 vals[1] = do_div(tmp, 1000000000LL);
452 vals[0] = tmp;
453 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
454 case IIO_VAL_INT_MULTIPLE:
455 {
456 int i;
457 int len = 0;
458
459 for (i = 0; i < size; ++i)
460 len += snprintf(&buf[len], PAGE_SIZE - len, "%d ",
461 vals[i]);
462 len += snprintf(&buf[len], PAGE_SIZE - len, "\n");
463 return len;
464 }
465 default:
466 return 0;
467 }
468 }
469
470 static ssize_t iio_read_channel_info(struct device *dev,
471 struct device_attribute *attr,
472 char *buf)
473 {
474 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
475 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
476 int vals[INDIO_MAX_RAW_ELEMENTS];
477 int ret;
478 int val_len = 2;
479
480 if (indio_dev->info->read_raw_multi)
481 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
482 INDIO_MAX_RAW_ELEMENTS,
483 vals, &val_len,
484 this_attr->address);
485 else
486 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
487 &vals[0], &vals[1], this_attr->address);
488
489 if (ret < 0)
490 return ret;
491
492 return iio_format_value(buf, ret, val_len, vals);
493 }
494
495 /**
496 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
497 * @str: The string to parse
498 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
499 * @integer: The integer part of the number
500 * @fract: The fractional part of the number
501 *
502 * Returns 0 on success, or a negative error code if the string could not be
503 * parsed.
504 */
505 int iio_str_to_fixpoint(const char *str, int fract_mult,
506 int *integer, int *fract)
507 {
508 int i = 0, f = 0;
509 bool integer_part = true, negative = false;
510
511 if (str[0] == '-') {
512 negative = true;
513 str++;
514 } else if (str[0] == '+') {
515 str++;
516 }
517
518 while (*str) {
519 if ('0' <= *str && *str <= '9') {
520 if (integer_part) {
521 i = i * 10 + *str - '0';
522 } else {
523 f += fract_mult * (*str - '0');
524 fract_mult /= 10;
525 }
526 } else if (*str == '\n') {
527 if (*(str + 1) == '\0')
528 break;
529 else
530 return -EINVAL;
531 } else if (*str == '.' && integer_part) {
532 integer_part = false;
533 } else {
534 return -EINVAL;
535 }
536 str++;
537 }
538
539 if (negative) {
540 if (i)
541 i = -i;
542 else
543 f = -f;
544 }
545
546 *integer = i;
547 *fract = f;
548
549 return 0;
550 }
551 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
552
553 static ssize_t iio_write_channel_info(struct device *dev,
554 struct device_attribute *attr,
555 const char *buf,
556 size_t len)
557 {
558 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
559 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
560 int ret, fract_mult = 100000;
561 int integer, fract;
562
563 /* Assumes decimal - precision based on number of digits */
564 if (!indio_dev->info->write_raw)
565 return -EINVAL;
566
567 if (indio_dev->info->write_raw_get_fmt)
568 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
569 this_attr->c, this_attr->address)) {
570 case IIO_VAL_INT_PLUS_MICRO:
571 fract_mult = 100000;
572 break;
573 case IIO_VAL_INT_PLUS_NANO:
574 fract_mult = 100000000;
575 break;
576 default:
577 return -EINVAL;
578 }
579
580 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
581 if (ret)
582 return ret;
583
584 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
585 integer, fract, this_attr->address);
586 if (ret)
587 return ret;
588
589 return len;
590 }
591
592 static
593 int __iio_device_attr_init(struct device_attribute *dev_attr,
594 const char *postfix,
595 struct iio_chan_spec const *chan,
596 ssize_t (*readfunc)(struct device *dev,
597 struct device_attribute *attr,
598 char *buf),
599 ssize_t (*writefunc)(struct device *dev,
600 struct device_attribute *attr,
601 const char *buf,
602 size_t len),
603 enum iio_shared_by shared_by)
604 {
605 int ret = 0;
606 char *name = NULL;
607 char *full_postfix;
608 sysfs_attr_init(&dev_attr->attr);
609
610 /* Build up postfix of <extend_name>_<modifier>_postfix */
611 if (chan->modified && (shared_by == IIO_SEPARATE)) {
612 if (chan->extend_name)
613 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
614 iio_modifier_names[chan
615 ->channel2],
616 chan->extend_name,
617 postfix);
618 else
619 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
620 iio_modifier_names[chan
621 ->channel2],
622 postfix);
623 } else {
624 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
625 full_postfix = kstrdup(postfix, GFP_KERNEL);
626 else
627 full_postfix = kasprintf(GFP_KERNEL,
628 "%s_%s",
629 chan->extend_name,
630 postfix);
631 }
632 if (full_postfix == NULL)
633 return -ENOMEM;
634
635 if (chan->differential) { /* Differential can not have modifier */
636 switch (shared_by) {
637 case IIO_SHARED_BY_ALL:
638 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
639 break;
640 case IIO_SHARED_BY_DIR:
641 name = kasprintf(GFP_KERNEL, "%s_%s",
642 iio_direction[chan->output],
643 full_postfix);
644 break;
645 case IIO_SHARED_BY_TYPE:
646 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
647 iio_direction[chan->output],
648 iio_chan_type_name_spec[chan->type],
649 iio_chan_type_name_spec[chan->type],
650 full_postfix);
651 break;
652 case IIO_SEPARATE:
653 if (!chan->indexed) {
654 WARN_ON("Differential channels must be indexed\n");
655 ret = -EINVAL;
656 goto error_free_full_postfix;
657 }
658 name = kasprintf(GFP_KERNEL,
659 "%s_%s%d-%s%d_%s",
660 iio_direction[chan->output],
661 iio_chan_type_name_spec[chan->type],
662 chan->channel,
663 iio_chan_type_name_spec[chan->type],
664 chan->channel2,
665 full_postfix);
666 break;
667 }
668 } else { /* Single ended */
669 switch (shared_by) {
670 case IIO_SHARED_BY_ALL:
671 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
672 break;
673 case IIO_SHARED_BY_DIR:
674 name = kasprintf(GFP_KERNEL, "%s_%s",
675 iio_direction[chan->output],
676 full_postfix);
677 break;
678 case IIO_SHARED_BY_TYPE:
679 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
680 iio_direction[chan->output],
681 iio_chan_type_name_spec[chan->type],
682 full_postfix);
683 break;
684
685 case IIO_SEPARATE:
686 if (chan->indexed)
687 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
688 iio_direction[chan->output],
689 iio_chan_type_name_spec[chan->type],
690 chan->channel,
691 full_postfix);
692 else
693 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
694 iio_direction[chan->output],
695 iio_chan_type_name_spec[chan->type],
696 full_postfix);
697 break;
698 }
699 }
700 if (name == NULL) {
701 ret = -ENOMEM;
702 goto error_free_full_postfix;
703 }
704 dev_attr->attr.name = name;
705
706 if (readfunc) {
707 dev_attr->attr.mode |= S_IRUGO;
708 dev_attr->show = readfunc;
709 }
710
711 if (writefunc) {
712 dev_attr->attr.mode |= S_IWUSR;
713 dev_attr->store = writefunc;
714 }
715
716 error_free_full_postfix:
717 kfree(full_postfix);
718
719 return ret;
720 }
721
722 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
723 {
724 kfree(dev_attr->attr.name);
725 }
726
727 int __iio_add_chan_devattr(const char *postfix,
728 struct iio_chan_spec const *chan,
729 ssize_t (*readfunc)(struct device *dev,
730 struct device_attribute *attr,
731 char *buf),
732 ssize_t (*writefunc)(struct device *dev,
733 struct device_attribute *attr,
734 const char *buf,
735 size_t len),
736 u64 mask,
737 enum iio_shared_by shared_by,
738 struct device *dev,
739 struct list_head *attr_list)
740 {
741 int ret;
742 struct iio_dev_attr *iio_attr, *t;
743
744 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
745 if (iio_attr == NULL)
746 return -ENOMEM;
747 ret = __iio_device_attr_init(&iio_attr->dev_attr,
748 postfix, chan,
749 readfunc, writefunc, shared_by);
750 if (ret)
751 goto error_iio_dev_attr_free;
752 iio_attr->c = chan;
753 iio_attr->address = mask;
754 list_for_each_entry(t, attr_list, l)
755 if (strcmp(t->dev_attr.attr.name,
756 iio_attr->dev_attr.attr.name) == 0) {
757 if (shared_by == IIO_SEPARATE)
758 dev_err(dev, "tried to double register : %s\n",
759 t->dev_attr.attr.name);
760 ret = -EBUSY;
761 goto error_device_attr_deinit;
762 }
763 list_add(&iio_attr->l, attr_list);
764
765 return 0;
766
767 error_device_attr_deinit:
768 __iio_device_attr_deinit(&iio_attr->dev_attr);
769 error_iio_dev_attr_free:
770 kfree(iio_attr);
771 return ret;
772 }
773
774 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
775 struct iio_chan_spec const *chan,
776 enum iio_shared_by shared_by,
777 const long *infomask)
778 {
779 int i, ret, attrcount = 0;
780
781 for_each_set_bit(i, infomask, sizeof(infomask)*8) {
782 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
783 return -EINVAL;
784 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
785 chan,
786 &iio_read_channel_info,
787 &iio_write_channel_info,
788 i,
789 shared_by,
790 &indio_dev->dev,
791 &indio_dev->channel_attr_list);
792 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
793 continue;
794 else if (ret < 0)
795 return ret;
796 attrcount++;
797 }
798
799 return attrcount;
800 }
801
802 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
803 struct iio_chan_spec const *chan)
804 {
805 int ret, attrcount = 0;
806 const struct iio_chan_spec_ext_info *ext_info;
807
808 if (chan->channel < 0)
809 return 0;
810 ret = iio_device_add_info_mask_type(indio_dev, chan,
811 IIO_SEPARATE,
812 &chan->info_mask_separate);
813 if (ret < 0)
814 return ret;
815 attrcount += ret;
816
817 ret = iio_device_add_info_mask_type(indio_dev, chan,
818 IIO_SHARED_BY_TYPE,
819 &chan->info_mask_shared_by_type);
820 if (ret < 0)
821 return ret;
822 attrcount += ret;
823
824 ret = iio_device_add_info_mask_type(indio_dev, chan,
825 IIO_SHARED_BY_DIR,
826 &chan->info_mask_shared_by_dir);
827 if (ret < 0)
828 return ret;
829 attrcount += ret;
830
831 ret = iio_device_add_info_mask_type(indio_dev, chan,
832 IIO_SHARED_BY_ALL,
833 &chan->info_mask_shared_by_all);
834 if (ret < 0)
835 return ret;
836 attrcount += ret;
837
838 if (chan->ext_info) {
839 unsigned int i = 0;
840 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
841 ret = __iio_add_chan_devattr(ext_info->name,
842 chan,
843 ext_info->read ?
844 &iio_read_channel_ext_info : NULL,
845 ext_info->write ?
846 &iio_write_channel_ext_info : NULL,
847 i,
848 ext_info->shared,
849 &indio_dev->dev,
850 &indio_dev->channel_attr_list);
851 i++;
852 if (ret == -EBUSY && ext_info->shared)
853 continue;
854
855 if (ret)
856 return ret;
857
858 attrcount++;
859 }
860 }
861
862 return attrcount;
863 }
864
865 /**
866 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
867 * @attr_list: List of IIO device attributes
868 *
869 * This function frees the memory allocated for each of the IIO device
870 * attributes in the list.
871 */
872 void iio_free_chan_devattr_list(struct list_head *attr_list)
873 {
874 struct iio_dev_attr *p, *n;
875
876 list_for_each_entry_safe(p, n, attr_list, l) {
877 kfree(p->dev_attr.attr.name);
878 list_del(&p->l);
879 kfree(p);
880 }
881 }
882
883 static ssize_t iio_show_dev_name(struct device *dev,
884 struct device_attribute *attr,
885 char *buf)
886 {
887 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
888 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
889 }
890
891 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
892
893 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
894 {
895 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
896 struct iio_dev_attr *p;
897 struct attribute **attr;
898
899 /* First count elements in any existing group */
900 if (indio_dev->info->attrs) {
901 attr = indio_dev->info->attrs->attrs;
902 while (*attr++ != NULL)
903 attrcount_orig++;
904 }
905 attrcount = attrcount_orig;
906 /*
907 * New channel registration method - relies on the fact a group does
908 * not need to be initialized if its name is NULL.
909 */
910 if (indio_dev->channels)
911 for (i = 0; i < indio_dev->num_channels; i++) {
912 ret = iio_device_add_channel_sysfs(indio_dev,
913 &indio_dev
914 ->channels[i]);
915 if (ret < 0)
916 goto error_clear_attrs;
917 attrcount += ret;
918 }
919
920 if (indio_dev->name)
921 attrcount++;
922
923 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
924 sizeof(indio_dev->chan_attr_group.attrs[0]),
925 GFP_KERNEL);
926 if (indio_dev->chan_attr_group.attrs == NULL) {
927 ret = -ENOMEM;
928 goto error_clear_attrs;
929 }
930 /* Copy across original attributes */
931 if (indio_dev->info->attrs)
932 memcpy(indio_dev->chan_attr_group.attrs,
933 indio_dev->info->attrs->attrs,
934 sizeof(indio_dev->chan_attr_group.attrs[0])
935 *attrcount_orig);
936 attrn = attrcount_orig;
937 /* Add all elements from the list. */
938 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
939 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
940 if (indio_dev->name)
941 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
942
943 indio_dev->groups[indio_dev->groupcounter++] =
944 &indio_dev->chan_attr_group;
945
946 return 0;
947
948 error_clear_attrs:
949 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
950
951 return ret;
952 }
953
954 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
955 {
956
957 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
958 kfree(indio_dev->chan_attr_group.attrs);
959 indio_dev->chan_attr_group.attrs = NULL;
960 }
961
962 static void iio_dev_release(struct device *device)
963 {
964 struct iio_dev *indio_dev = dev_to_iio_dev(device);
965 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
966 iio_device_unregister_trigger_consumer(indio_dev);
967 iio_device_unregister_eventset(indio_dev);
968 iio_device_unregister_sysfs(indio_dev);
969
970 iio_buffer_put(indio_dev->buffer);
971
972 ida_simple_remove(&iio_ida, indio_dev->id);
973 kfree(indio_dev);
974 }
975
976 struct device_type iio_device_type = {
977 .name = "iio_device",
978 .release = iio_dev_release,
979 };
980
981 /**
982 * iio_device_alloc() - allocate an iio_dev from a driver
983 * @sizeof_priv: Space to allocate for private structure.
984 **/
985 struct iio_dev *iio_device_alloc(int sizeof_priv)
986 {
987 struct iio_dev *dev;
988 size_t alloc_size;
989
990 alloc_size = sizeof(struct iio_dev);
991 if (sizeof_priv) {
992 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
993 alloc_size += sizeof_priv;
994 }
995 /* ensure 32-byte alignment of whole construct ? */
996 alloc_size += IIO_ALIGN - 1;
997
998 dev = kzalloc(alloc_size, GFP_KERNEL);
999
1000 if (dev) {
1001 dev->dev.groups = dev->groups;
1002 dev->dev.type = &iio_device_type;
1003 dev->dev.bus = &iio_bus_type;
1004 device_initialize(&dev->dev);
1005 dev_set_drvdata(&dev->dev, (void *)dev);
1006 mutex_init(&dev->mlock);
1007 mutex_init(&dev->info_exist_lock);
1008 INIT_LIST_HEAD(&dev->channel_attr_list);
1009
1010 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1011 if (dev->id < 0) {
1012 /* cannot use a dev_err as the name isn't available */
1013 pr_err("failed to get device id\n");
1014 kfree(dev);
1015 return NULL;
1016 }
1017 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1018 INIT_LIST_HEAD(&dev->buffer_list);
1019 }
1020
1021 return dev;
1022 }
1023 EXPORT_SYMBOL(iio_device_alloc);
1024
1025 /**
1026 * iio_device_free() - free an iio_dev from a driver
1027 * @dev: the iio_dev associated with the device
1028 **/
1029 void iio_device_free(struct iio_dev *dev)
1030 {
1031 if (dev)
1032 put_device(&dev->dev);
1033 }
1034 EXPORT_SYMBOL(iio_device_free);
1035
1036 static void devm_iio_device_release(struct device *dev, void *res)
1037 {
1038 iio_device_free(*(struct iio_dev **)res);
1039 }
1040
1041 static int devm_iio_device_match(struct device *dev, void *res, void *data)
1042 {
1043 struct iio_dev **r = res;
1044 if (!r || !*r) {
1045 WARN_ON(!r || !*r);
1046 return 0;
1047 }
1048 return *r == data;
1049 }
1050
1051 /**
1052 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1053 * @dev: Device to allocate iio_dev for
1054 * @sizeof_priv: Space to allocate for private structure.
1055 *
1056 * Managed iio_device_alloc. iio_dev allocated with this function is
1057 * automatically freed on driver detach.
1058 *
1059 * If an iio_dev allocated with this function needs to be freed separately,
1060 * devm_iio_device_free() must be used.
1061 *
1062 * RETURNS:
1063 * Pointer to allocated iio_dev on success, NULL on failure.
1064 */
1065 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1066 {
1067 struct iio_dev **ptr, *iio_dev;
1068
1069 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1070 GFP_KERNEL);
1071 if (!ptr)
1072 return NULL;
1073
1074 iio_dev = iio_device_alloc(sizeof_priv);
1075 if (iio_dev) {
1076 *ptr = iio_dev;
1077 devres_add(dev, ptr);
1078 } else {
1079 devres_free(ptr);
1080 }
1081
1082 return iio_dev;
1083 }
1084 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1085
1086 /**
1087 * devm_iio_device_free - Resource-managed iio_device_free()
1088 * @dev: Device this iio_dev belongs to
1089 * @iio_dev: the iio_dev associated with the device
1090 *
1091 * Free iio_dev allocated with devm_iio_device_alloc().
1092 */
1093 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1094 {
1095 int rc;
1096
1097 rc = devres_release(dev, devm_iio_device_release,
1098 devm_iio_device_match, iio_dev);
1099 WARN_ON(rc);
1100 }
1101 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1102
1103 /**
1104 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1105 * @inode: Inode structure for identifying the device in the file system
1106 * @filp: File structure for iio device used to keep and later access
1107 * private data
1108 *
1109 * Return: 0 on success or -EBUSY if the device is already opened
1110 **/
1111 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1112 {
1113 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1114 struct iio_dev, chrdev);
1115
1116 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1117 return -EBUSY;
1118
1119 iio_device_get(indio_dev);
1120
1121 filp->private_data = indio_dev;
1122
1123 return 0;
1124 }
1125
1126 /**
1127 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1128 * @inode: Inode structure pointer for the char device
1129 * @filp: File structure pointer for the char device
1130 *
1131 * Return: 0 for successful release
1132 */
1133 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1134 {
1135 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1136 struct iio_dev, chrdev);
1137 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1138 iio_device_put(indio_dev);
1139
1140 return 0;
1141 }
1142
1143 /* Somewhat of a cross file organization violation - ioctls here are actually
1144 * event related */
1145 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1146 {
1147 struct iio_dev *indio_dev = filp->private_data;
1148 int __user *ip = (int __user *)arg;
1149 int fd;
1150
1151 if (!indio_dev->info)
1152 return -ENODEV;
1153
1154 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1155 fd = iio_event_getfd(indio_dev);
1156 if (copy_to_user(ip, &fd, sizeof(fd)))
1157 return -EFAULT;
1158 return 0;
1159 }
1160 return -EINVAL;
1161 }
1162
1163 static const struct file_operations iio_buffer_fileops = {
1164 .read = iio_buffer_read_first_n_outer_addr,
1165 .release = iio_chrdev_release,
1166 .open = iio_chrdev_open,
1167 .poll = iio_buffer_poll_addr,
1168 .owner = THIS_MODULE,
1169 .llseek = noop_llseek,
1170 .unlocked_ioctl = iio_ioctl,
1171 .compat_ioctl = iio_ioctl,
1172 };
1173
1174 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1175 {
1176 int i, j;
1177 const struct iio_chan_spec *channels = indio_dev->channels;
1178
1179 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1180 return 0;
1181
1182 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1183 if (channels[i].scan_index < 0)
1184 continue;
1185 for (j = i + 1; j < indio_dev->num_channels; j++)
1186 if (channels[i].scan_index == channels[j].scan_index) {
1187 dev_err(&indio_dev->dev,
1188 "Duplicate scan index %d\n",
1189 channels[i].scan_index);
1190 return -EINVAL;
1191 }
1192 }
1193
1194 return 0;
1195 }
1196
1197 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1198
1199 /**
1200 * iio_device_register() - register a device with the IIO subsystem
1201 * @indio_dev: Device structure filled by the device driver
1202 **/
1203 int iio_device_register(struct iio_dev *indio_dev)
1204 {
1205 int ret;
1206
1207 /* If the calling driver did not initialize of_node, do it here */
1208 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1209 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1210
1211 ret = iio_check_unique_scan_index(indio_dev);
1212 if (ret < 0)
1213 return ret;
1214
1215 /* configure elements for the chrdev */
1216 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1217
1218 ret = iio_device_register_debugfs(indio_dev);
1219 if (ret) {
1220 dev_err(indio_dev->dev.parent,
1221 "Failed to register debugfs interfaces\n");
1222 return ret;
1223 }
1224
1225 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1226 if (ret) {
1227 dev_err(indio_dev->dev.parent,
1228 "Failed to create buffer sysfs interfaces\n");
1229 goto error_unreg_debugfs;
1230 }
1231
1232 ret = iio_device_register_sysfs(indio_dev);
1233 if (ret) {
1234 dev_err(indio_dev->dev.parent,
1235 "Failed to register sysfs interfaces\n");
1236 goto error_buffer_free_sysfs;
1237 }
1238 ret = iio_device_register_eventset(indio_dev);
1239 if (ret) {
1240 dev_err(indio_dev->dev.parent,
1241 "Failed to register event set\n");
1242 goto error_free_sysfs;
1243 }
1244 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1245 iio_device_register_trigger_consumer(indio_dev);
1246
1247 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1248 indio_dev->setup_ops == NULL)
1249 indio_dev->setup_ops = &noop_ring_setup_ops;
1250
1251 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1252 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1253 indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
1254 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1255 if (ret < 0)
1256 goto error_unreg_eventset;
1257
1258 ret = device_add(&indio_dev->dev);
1259 if (ret < 0)
1260 goto error_cdev_del;
1261
1262 return 0;
1263 error_cdev_del:
1264 cdev_del(&indio_dev->chrdev);
1265 error_unreg_eventset:
1266 iio_device_unregister_eventset(indio_dev);
1267 error_free_sysfs:
1268 iio_device_unregister_sysfs(indio_dev);
1269 error_buffer_free_sysfs:
1270 iio_buffer_free_sysfs_and_mask(indio_dev);
1271 error_unreg_debugfs:
1272 iio_device_unregister_debugfs(indio_dev);
1273 return ret;
1274 }
1275 EXPORT_SYMBOL(iio_device_register);
1276
1277 /**
1278 * iio_device_unregister() - unregister a device from the IIO subsystem
1279 * @indio_dev: Device structure representing the device.
1280 **/
1281 void iio_device_unregister(struct iio_dev *indio_dev)
1282 {
1283 mutex_lock(&indio_dev->info_exist_lock);
1284
1285 device_del(&indio_dev->dev);
1286
1287 if (indio_dev->chrdev.dev)
1288 cdev_del(&indio_dev->chrdev);
1289 iio_device_unregister_debugfs(indio_dev);
1290
1291 iio_disable_all_buffers(indio_dev);
1292
1293 indio_dev->info = NULL;
1294
1295 iio_device_wakeup_eventset(indio_dev);
1296 iio_buffer_wakeup_poll(indio_dev);
1297
1298 mutex_unlock(&indio_dev->info_exist_lock);
1299
1300 iio_buffer_free_sysfs_and_mask(indio_dev);
1301 }
1302 EXPORT_SYMBOL(iio_device_unregister);
1303
1304 static void devm_iio_device_unreg(struct device *dev, void *res)
1305 {
1306 iio_device_unregister(*(struct iio_dev **)res);
1307 }
1308
1309 /**
1310 * devm_iio_device_register - Resource-managed iio_device_register()
1311 * @dev: Device to allocate iio_dev for
1312 * @indio_dev: Device structure filled by the device driver
1313 *
1314 * Managed iio_device_register. The IIO device registered with this
1315 * function is automatically unregistered on driver detach. This function
1316 * calls iio_device_register() internally. Refer to that function for more
1317 * information.
1318 *
1319 * If an iio_dev registered with this function needs to be unregistered
1320 * separately, devm_iio_device_unregister() must be used.
1321 *
1322 * RETURNS:
1323 * 0 on success, negative error number on failure.
1324 */
1325 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
1326 {
1327 struct iio_dev **ptr;
1328 int ret;
1329
1330 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1331 if (!ptr)
1332 return -ENOMEM;
1333
1334 *ptr = indio_dev;
1335 ret = iio_device_register(indio_dev);
1336 if (!ret)
1337 devres_add(dev, ptr);
1338 else
1339 devres_free(ptr);
1340
1341 return ret;
1342 }
1343 EXPORT_SYMBOL_GPL(devm_iio_device_register);
1344
1345 /**
1346 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1347 * @dev: Device this iio_dev belongs to
1348 * @indio_dev: the iio_dev associated with the device
1349 *
1350 * Unregister iio_dev registered with devm_iio_device_register().
1351 */
1352 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1353 {
1354 int rc;
1355
1356 rc = devres_release(dev, devm_iio_device_unreg,
1357 devm_iio_device_match, indio_dev);
1358 WARN_ON(rc);
1359 }
1360 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1361
1362 subsys_initcall(iio_init);
1363 module_exit(iio_exit);
1364
1365 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1366 MODULE_DESCRIPTION("Industrial I/O core");
1367 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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