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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
36static DEFINE_IDA(iio_ida);
37
38static dev_t iio_devt;
39
40#define IIO_DEV_MAX 256
41struct bus_type iio_bus_type = {
42 .name = "iio",
43};
44EXPORT_SYMBOL(iio_bus_type);
45
46static struct dentry *iio_debugfs_dentry;
47
48static const char * const iio_direction[] = {
49 [0] = "in",
50 [1] = "out",
51};
52
53static 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};
73
74static const char * const iio_modifier_names[] = {
75 [IIO_MOD_X] = "x",
76 [IIO_MOD_Y] = "y",
77 [IIO_MOD_Z] = "z",
78 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
79 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
80 [IIO_MOD_LIGHT_BOTH] = "both",
81 [IIO_MOD_LIGHT_IR] = "ir",
82 [IIO_MOD_LIGHT_CLEAR] = "clear",
83 [IIO_MOD_LIGHT_RED] = "red",
84 [IIO_MOD_LIGHT_GREEN] = "green",
85 [IIO_MOD_LIGHT_BLUE] = "blue",
86};
87
88
89static const char * const iio_chan_info_postfix[] = {
90 [IIO_CHAN_INFO_RAW] = "raw",
91 [IIO_CHAN_INFO_PROCESSED] = "input",
92 [IIO_CHAN_INFO_SCALE] = "scale",
93 [IIO_CHAN_INFO_OFFSET] = "offset",
94 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
95 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
96 [IIO_CHAN_INFO_PEAK] = "peak_raw",
97 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
98 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
99 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
100 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
101 = "filter_low_pass_3db_frequency",
102 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
103 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
104 [IIO_CHAN_INFO_PHASE] = "phase",
105 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
106 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
107 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
108};
109
110const struct iio_chan_spec
111*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
112{
113 int i;
114
115 for (i = 0; i < indio_dev->num_channels; i++)
116 if (indio_dev->channels[i].scan_index == si)
117 return &indio_dev->channels[i];
118 return NULL;
119}
120
121
122ssize_t iio_read_const_attr(struct device *dev,
123 struct device_attribute *attr,
124 char *buf)
125{
126 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
127}
128EXPORT_SYMBOL(iio_read_const_attr);
129
130static int __init iio_init(void)
131{
132 int ret;
133
134
135 ret = bus_register(&iio_bus_type);
136 if (ret < 0) {
137 pr_err("could not register bus type\n");
138 goto error_nothing;
139 }
140
141 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
142 if (ret < 0) {
143 pr_err("failed to allocate char dev region\n");
144 goto error_unregister_bus_type;
145 }
146
147 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
148
149 return 0;
150
151error_unregister_bus_type:
152 bus_unregister(&iio_bus_type);
153error_nothing:
154 return ret;
155}
156
157static void __exit iio_exit(void)
158{
159 if (iio_devt)
160 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
161 bus_unregister(&iio_bus_type);
162 debugfs_remove(iio_debugfs_dentry);
163}
164
165#if defined(CONFIG_DEBUG_FS)
166static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
167 size_t count, loff_t *ppos)
168{
169 struct iio_dev *indio_dev = file->private_data;
170 char buf[20];
171 unsigned val = 0;
172 ssize_t len;
173 int ret;
174
175 ret = indio_dev->info->debugfs_reg_access(indio_dev,
176 indio_dev->cached_reg_addr,
177 0, &val);
178 if (ret)
179 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
180
181 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
182
183 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
184}
185
186static ssize_t iio_debugfs_write_reg(struct file *file,
187 const char __user *userbuf, size_t count, loff_t *ppos)
188{
189 struct iio_dev *indio_dev = file->private_data;
190 unsigned reg, val;
191 char buf[80];
192 int ret;
193
194 count = min_t(size_t, count, (sizeof(buf)-1));
195 if (copy_from_user(buf, userbuf, count))
196 return -EFAULT;
197
198 buf[count] = 0;
199
200 ret = sscanf(buf, "%i %i", ®, &val);
201
202 switch (ret) {
203 case 1:
204 indio_dev->cached_reg_addr = reg;
205 break;
206 case 2:
207 indio_dev->cached_reg_addr = reg;
208 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
209 val, NULL);
210 if (ret) {
211 dev_err(indio_dev->dev.parent, "%s: write failed\n",
212 __func__);
213 return ret;
214 }
215 break;
216 default:
217 return -EINVAL;
218 }
219
220 return count;
221}
222
223static const struct file_operations iio_debugfs_reg_fops = {
224 .open = simple_open,
225 .read = iio_debugfs_read_reg,
226 .write = iio_debugfs_write_reg,
227};
228
229static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
230{
231 debugfs_remove_recursive(indio_dev->debugfs_dentry);
232}
233
234static int iio_device_register_debugfs(struct iio_dev *indio_dev)
235{
236 struct dentry *d;
237
238 if (indio_dev->info->debugfs_reg_access == NULL)
239 return 0;
240
241 if (!iio_debugfs_dentry)
242 return 0;
243
244 indio_dev->debugfs_dentry =
245 debugfs_create_dir(dev_name(&indio_dev->dev),
246 iio_debugfs_dentry);
247 if (indio_dev->debugfs_dentry == NULL) {
248 dev_warn(indio_dev->dev.parent,
249 "Failed to create debugfs directory\n");
250 return -EFAULT;
251 }
252
253 d = debugfs_create_file("direct_reg_access", 0644,
254 indio_dev->debugfs_dentry,
255 indio_dev, &iio_debugfs_reg_fops);
256 if (!d) {
257 iio_device_unregister_debugfs(indio_dev);
258 return -ENOMEM;
259 }
260
261 return 0;
262}
263#else
264static int iio_device_register_debugfs(struct iio_dev *indio_dev)
265{
266 return 0;
267}
268
269static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
270{
271}
272#endif
273
274static ssize_t iio_read_channel_ext_info(struct device *dev,
275 struct device_attribute *attr,
276 char *buf)
277{
278 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
279 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
280 const struct iio_chan_spec_ext_info *ext_info;
281
282 ext_info = &this_attr->c->ext_info[this_attr->address];
283
284 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
285}
286
287static ssize_t iio_write_channel_ext_info(struct device *dev,
288 struct device_attribute *attr,
289 const char *buf,
290 size_t len)
291{
292 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
293 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
294 const struct iio_chan_spec_ext_info *ext_info;
295
296 ext_info = &this_attr->c->ext_info[this_attr->address];
297
298 return ext_info->write(indio_dev, ext_info->private,
299 this_attr->c, buf, len);
300}
301
302ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
303 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
304{
305 const struct iio_enum *e = (const struct iio_enum *)priv;
306 unsigned int i;
307 size_t len = 0;
308
309 if (!e->num_items)
310 return 0;
311
312 for (i = 0; i < e->num_items; ++i)
313 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
314
315
316 buf[len - 1] = '\n';
317
318 return len;
319}
320EXPORT_SYMBOL_GPL(iio_enum_available_read);
321
322ssize_t iio_enum_read(struct iio_dev *indio_dev,
323 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
324{
325 const struct iio_enum *e = (const struct iio_enum *)priv;
326 int i;
327
328 if (!e->get)
329 return -EINVAL;
330
331 i = e->get(indio_dev, chan);
332 if (i < 0)
333 return i;
334 else if (i >= e->num_items)
335 return -EINVAL;
336
337 return sprintf(buf, "%s\n", e->items[i]);
338}
339EXPORT_SYMBOL_GPL(iio_enum_read);
340
341ssize_t iio_enum_write(struct iio_dev *indio_dev,
342 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
343 size_t len)
344{
345 const struct iio_enum *e = (const struct iio_enum *)priv;
346 unsigned int i;
347 int ret;
348
349 if (!e->set)
350 return -EINVAL;
351
352 for (i = 0; i < e->num_items; i++) {
353 if (sysfs_streq(buf, e->items[i]))
354 break;
355 }
356
357 if (i == e->num_items)
358 return -EINVAL;
359
360 ret = e->set(indio_dev, chan, i);
361 return ret ? ret : len;
362}
363EXPORT_SYMBOL_GPL(iio_enum_write);
364
365
366
367
368
369
370
371
372
373ssize_t iio_format_value(char *buf, unsigned int type, int val, int val2)
374{
375 unsigned long long tmp;
376 bool scale_db = false;
377
378 switch (type) {
379 case IIO_VAL_INT:
380 return sprintf(buf, "%d\n", val);
381 case IIO_VAL_INT_PLUS_MICRO_DB:
382 scale_db = true;
383 case IIO_VAL_INT_PLUS_MICRO:
384 if (val2 < 0)
385 return sprintf(buf, "-%ld.%06u%s\n", abs(val), -val2,
386 scale_db ? " dB" : "");
387 else
388 return sprintf(buf, "%d.%06u%s\n", val, val2,
389 scale_db ? " dB" : "");
390 case IIO_VAL_INT_PLUS_NANO:
391 if (val2 < 0)
392 return sprintf(buf, "-%ld.%09u\n", abs(val), -val2);
393 else
394 return sprintf(buf, "%d.%09u\n", val, val2);
395 case IIO_VAL_FRACTIONAL:
396 tmp = div_s64((s64)val * 1000000000LL, val2);
397 val2 = do_div(tmp, 1000000000LL);
398 val = tmp;
399 return sprintf(buf, "%d.%09u\n", val, val2);
400 case IIO_VAL_FRACTIONAL_LOG2:
401 tmp = (s64)val * 1000000000LL >> val2;
402 val2 = do_div(tmp, 1000000000LL);
403 val = tmp;
404 return sprintf(buf, "%d.%09u\n", val, val2);
405 default:
406 return 0;
407 }
408}
409
410static ssize_t iio_read_channel_info(struct device *dev,
411 struct device_attribute *attr,
412 char *buf)
413{
414 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
415 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
416 int val, val2;
417 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
418 &val, &val2, this_attr->address);
419
420 if (ret < 0)
421 return ret;
422
423 return iio_format_value(buf, ret, val, val2);
424}
425
426
427
428
429
430
431
432
433
434
435
436int iio_str_to_fixpoint(const char *str, int fract_mult,
437 int *integer, int *fract)
438{
439 int i = 0, f = 0;
440 bool integer_part = true, negative = false;
441
442 if (str[0] == '-') {
443 negative = true;
444 str++;
445 } else if (str[0] == '+') {
446 str++;
447 }
448
449 while (*str) {
450 if ('0' <= *str && *str <= '9') {
451 if (integer_part) {
452 i = i * 10 + *str - '0';
453 } else {
454 f += fract_mult * (*str - '0');
455 fract_mult /= 10;
456 }
457 } else if (*str == '\n') {
458 if (*(str + 1) == '\0')
459 break;
460 else
461 return -EINVAL;
462 } else if (*str == '.' && integer_part) {
463 integer_part = false;
464 } else {
465 return -EINVAL;
466 }
467 str++;
468 }
469
470 if (negative) {
471 if (i)
472 i = -i;
473 else
474 f = -f;
475 }
476
477 *integer = i;
478 *fract = f;
479
480 return 0;
481}
482EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
483
484static ssize_t iio_write_channel_info(struct device *dev,
485 struct device_attribute *attr,
486 const char *buf,
487 size_t len)
488{
489 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
490 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
491 int ret, fract_mult = 100000;
492 int integer, fract;
493
494
495 if (!indio_dev->info->write_raw)
496 return -EINVAL;
497
498 if (indio_dev->info->write_raw_get_fmt)
499 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
500 this_attr->c, this_attr->address)) {
501 case IIO_VAL_INT_PLUS_MICRO:
502 fract_mult = 100000;
503 break;
504 case IIO_VAL_INT_PLUS_NANO:
505 fract_mult = 100000000;
506 break;
507 default:
508 return -EINVAL;
509 }
510
511 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
512 if (ret)
513 return ret;
514
515 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
516 integer, fract, this_attr->address);
517 if (ret)
518 return ret;
519
520 return len;
521}
522
523static
524int __iio_device_attr_init(struct device_attribute *dev_attr,
525 const char *postfix,
526 struct iio_chan_spec const *chan,
527 ssize_t (*readfunc)(struct device *dev,
528 struct device_attribute *attr,
529 char *buf),
530 ssize_t (*writefunc)(struct device *dev,
531 struct device_attribute *attr,
532 const char *buf,
533 size_t len),
534 enum iio_shared_by shared_by)
535{
536 int ret = 0;
537 char *name_format = NULL;
538 char *full_postfix;
539 sysfs_attr_init(&dev_attr->attr);
540
541
542 if (chan->modified && (shared_by == IIO_SEPARATE)) {
543 if (chan->extend_name)
544 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
545 iio_modifier_names[chan
546 ->channel2],
547 chan->extend_name,
548 postfix);
549 else
550 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
551 iio_modifier_names[chan
552 ->channel2],
553 postfix);
554 } else {
555 if (chan->extend_name == NULL)
556 full_postfix = kstrdup(postfix, GFP_KERNEL);
557 else
558 full_postfix = kasprintf(GFP_KERNEL,
559 "%s_%s",
560 chan->extend_name,
561 postfix);
562 }
563 if (full_postfix == NULL)
564 return -ENOMEM;
565
566 if (chan->differential) {
567 switch (shared_by) {
568 case IIO_SHARED_BY_ALL:
569 name_format = kasprintf(GFP_KERNEL, "%s", full_postfix);
570 break;
571 case IIO_SHARED_BY_DIR:
572 name_format = kasprintf(GFP_KERNEL, "%s_%s",
573 iio_direction[chan->output],
574 full_postfix);
575 break;
576 case IIO_SHARED_BY_TYPE:
577 name_format
578 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
579 iio_direction[chan->output],
580 iio_chan_type_name_spec[chan->type],
581 iio_chan_type_name_spec[chan->type],
582 full_postfix);
583 break;
584 case IIO_SEPARATE:
585 if (!chan->indexed) {
586 WARN_ON("Differential channels must be indexed\n");
587 ret = -EINVAL;
588 goto error_free_full_postfix;
589 }
590 name_format
591 = kasprintf(GFP_KERNEL,
592 "%s_%s%d-%s%d_%s",
593 iio_direction[chan->output],
594 iio_chan_type_name_spec[chan->type],
595 chan->channel,
596 iio_chan_type_name_spec[chan->type],
597 chan->channel2,
598 full_postfix);
599 break;
600 }
601 } else {
602 switch (shared_by) {
603 case IIO_SHARED_BY_ALL:
604 name_format = kasprintf(GFP_KERNEL, "%s", full_postfix);
605 break;
606 case IIO_SHARED_BY_DIR:
607 name_format = kasprintf(GFP_KERNEL, "%s_%s",
608 iio_direction[chan->output],
609 full_postfix);
610 break;
611 case IIO_SHARED_BY_TYPE:
612 name_format
613 = kasprintf(GFP_KERNEL, "%s_%s_%s",
614 iio_direction[chan->output],
615 iio_chan_type_name_spec[chan->type],
616 full_postfix);
617 break;
618
619 case IIO_SEPARATE:
620 if (chan->indexed)
621 name_format
622 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
623 iio_direction[chan->output],
624 iio_chan_type_name_spec[chan->type],
625 chan->channel,
626 full_postfix);
627 else
628 name_format
629 = kasprintf(GFP_KERNEL, "%s_%s_%s",
630 iio_direction[chan->output],
631 iio_chan_type_name_spec[chan->type],
632 full_postfix);
633 break;
634 }
635 }
636 if (name_format == NULL) {
637 ret = -ENOMEM;
638 goto error_free_full_postfix;
639 }
640 dev_attr->attr.name = kasprintf(GFP_KERNEL,
641 name_format,
642 chan->channel,
643 chan->channel2);
644 if (dev_attr->attr.name == NULL) {
645 ret = -ENOMEM;
646 goto error_free_name_format;
647 }
648
649 if (readfunc) {
650 dev_attr->attr.mode |= S_IRUGO;
651 dev_attr->show = readfunc;
652 }
653
654 if (writefunc) {
655 dev_attr->attr.mode |= S_IWUSR;
656 dev_attr->store = writefunc;
657 }
658error_free_name_format:
659 kfree(name_format);
660error_free_full_postfix:
661 kfree(full_postfix);
662
663 return ret;
664}
665
666static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
667{
668 kfree(dev_attr->attr.name);
669}
670
671int __iio_add_chan_devattr(const char *postfix,
672 struct iio_chan_spec const *chan,
673 ssize_t (*readfunc)(struct device *dev,
674 struct device_attribute *attr,
675 char *buf),
676 ssize_t (*writefunc)(struct device *dev,
677 struct device_attribute *attr,
678 const char *buf,
679 size_t len),
680 u64 mask,
681 enum iio_shared_by shared_by,
682 struct device *dev,
683 struct list_head *attr_list)
684{
685 int ret;
686 struct iio_dev_attr *iio_attr, *t;
687
688 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
689 if (iio_attr == NULL) {
690 ret = -ENOMEM;
691 goto error_ret;
692 }
693 ret = __iio_device_attr_init(&iio_attr->dev_attr,
694 postfix, chan,
695 readfunc, writefunc, shared_by);
696 if (ret)
697 goto error_iio_dev_attr_free;
698 iio_attr->c = chan;
699 iio_attr->address = mask;
700 list_for_each_entry(t, attr_list, l)
701 if (strcmp(t->dev_attr.attr.name,
702 iio_attr->dev_attr.attr.name) == 0) {
703 if (shared_by == IIO_SEPARATE)
704 dev_err(dev, "tried to double register : %s\n",
705 t->dev_attr.attr.name);
706 ret = -EBUSY;
707 goto error_device_attr_deinit;
708 }
709 list_add(&iio_attr->l, attr_list);
710
711 return 0;
712
713error_device_attr_deinit:
714 __iio_device_attr_deinit(&iio_attr->dev_attr);
715error_iio_dev_attr_free:
716 kfree(iio_attr);
717error_ret:
718 return ret;
719}
720
721static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
722 struct iio_chan_spec const *chan,
723 enum iio_shared_by shared_by,
724 const long *infomask)
725{
726 int i, ret, attrcount = 0;
727
728 for_each_set_bit(i, infomask, sizeof(infomask)*8) {
729 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
730 chan,
731 &iio_read_channel_info,
732 &iio_write_channel_info,
733 i,
734 shared_by,
735 &indio_dev->dev,
736 &indio_dev->channel_attr_list);
737 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
738 continue;
739 else if (ret < 0)
740 return ret;
741 attrcount++;
742 }
743
744 return attrcount;
745}
746
747static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
748 struct iio_chan_spec const *chan)
749{
750 int ret, attrcount = 0;
751 const struct iio_chan_spec_ext_info *ext_info;
752
753 if (chan->channel < 0)
754 return 0;
755 ret = iio_device_add_info_mask_type(indio_dev, chan,
756 IIO_SEPARATE,
757 &chan->info_mask_separate);
758 if (ret < 0)
759 return ret;
760 attrcount += ret;
761
762 ret = iio_device_add_info_mask_type(indio_dev, chan,
763 IIO_SHARED_BY_TYPE,
764 &chan->info_mask_shared_by_type);
765 if (ret < 0)
766 return ret;
767 attrcount += ret;
768
769 ret = iio_device_add_info_mask_type(indio_dev, chan,
770 IIO_SHARED_BY_DIR,
771 &chan->info_mask_shared_by_dir);
772 if (ret < 0)
773 return ret;
774 attrcount += ret;
775
776 ret = iio_device_add_info_mask_type(indio_dev, chan,
777 IIO_SHARED_BY_ALL,
778 &chan->info_mask_shared_by_all);
779 if (ret < 0)
780 return ret;
781 attrcount += ret;
782
783 if (chan->ext_info) {
784 unsigned int i = 0;
785 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
786 ret = __iio_add_chan_devattr(ext_info->name,
787 chan,
788 ext_info->read ?
789 &iio_read_channel_ext_info : NULL,
790 ext_info->write ?
791 &iio_write_channel_ext_info : NULL,
792 i,
793 ext_info->shared,
794 &indio_dev->dev,
795 &indio_dev->channel_attr_list);
796 i++;
797 if (ret == -EBUSY && ext_info->shared)
798 continue;
799
800 if (ret)
801 return ret;
802
803 attrcount++;
804 }
805 }
806
807 return attrcount;
808}
809
810
811
812
813
814
815
816
817
818void iio_free_chan_devattr_list(struct list_head *attr_list)
819{
820 struct iio_dev_attr *p, *n;
821
822 list_for_each_entry_safe(p, n, attr_list, l) {
823 kfree(p->dev_attr.attr.name);
824 kfree(p);
825 }
826}
827
828static ssize_t iio_show_dev_name(struct device *dev,
829 struct device_attribute *attr,
830 char *buf)
831{
832 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
833 return sprintf(buf, "%s\n", indio_dev->name);
834}
835
836static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
837
838static int iio_device_register_sysfs(struct iio_dev *indio_dev)
839{
840 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
841 struct iio_dev_attr *p;
842 struct attribute **attr;
843
844
845 if (indio_dev->info->attrs) {
846 attr = indio_dev->info->attrs->attrs;
847 while (*attr++ != NULL)
848 attrcount_orig++;
849 }
850 attrcount = attrcount_orig;
851
852
853
854
855 if (indio_dev->channels)
856 for (i = 0; i < indio_dev->num_channels; i++) {
857 ret = iio_device_add_channel_sysfs(indio_dev,
858 &indio_dev
859 ->channels[i]);
860 if (ret < 0)
861 goto error_clear_attrs;
862 attrcount += ret;
863 }
864
865 if (indio_dev->name)
866 attrcount++;
867
868 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
869 sizeof(indio_dev->chan_attr_group.attrs[0]),
870 GFP_KERNEL);
871 if (indio_dev->chan_attr_group.attrs == NULL) {
872 ret = -ENOMEM;
873 goto error_clear_attrs;
874 }
875
876 if (indio_dev->info->attrs)
877 memcpy(indio_dev->chan_attr_group.attrs,
878 indio_dev->info->attrs->attrs,
879 sizeof(indio_dev->chan_attr_group.attrs[0])
880 *attrcount_orig);
881 attrn = attrcount_orig;
882
883 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
884 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
885 if (indio_dev->name)
886 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
887
888 indio_dev->groups[indio_dev->groupcounter++] =
889 &indio_dev->chan_attr_group;
890
891 return 0;
892
893error_clear_attrs:
894 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
895
896 return ret;
897}
898
899static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
900{
901
902 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
903 kfree(indio_dev->chan_attr_group.attrs);
904}
905
906static void iio_dev_release(struct device *device)
907{
908 struct iio_dev *indio_dev = dev_to_iio_dev(device);
909 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
910 iio_device_unregister_trigger_consumer(indio_dev);
911 iio_device_unregister_eventset(indio_dev);
912 iio_device_unregister_sysfs(indio_dev);
913
914 iio_buffer_put(indio_dev->buffer);
915
916 ida_simple_remove(&iio_ida, indio_dev->id);
917 kfree(indio_dev);
918}
919
920struct device_type iio_device_type = {
921 .name = "iio_device",
922 .release = iio_dev_release,
923};
924
925struct iio_dev *iio_device_alloc(int sizeof_priv)
926{
927 struct iio_dev *dev;
928 size_t alloc_size;
929
930 alloc_size = sizeof(struct iio_dev);
931 if (sizeof_priv) {
932 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
933 alloc_size += sizeof_priv;
934 }
935
936 alloc_size += IIO_ALIGN - 1;
937
938 dev = kzalloc(alloc_size, GFP_KERNEL);
939
940 if (dev) {
941 dev->dev.groups = dev->groups;
942 dev->dev.type = &iio_device_type;
943 dev->dev.bus = &iio_bus_type;
944 device_initialize(&dev->dev);
945 dev_set_drvdata(&dev->dev, (void *)dev);
946 mutex_init(&dev->mlock);
947 mutex_init(&dev->info_exist_lock);
948 INIT_LIST_HEAD(&dev->channel_attr_list);
949
950 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
951 if (dev->id < 0) {
952
953 pr_err("failed to get device id\n");
954 kfree(dev);
955 return NULL;
956 }
957 dev_set_name(&dev->dev, "iio:device%d", dev->id);
958 INIT_LIST_HEAD(&dev->buffer_list);
959 }
960
961 return dev;
962}
963EXPORT_SYMBOL(iio_device_alloc);
964
965void iio_device_free(struct iio_dev *dev)
966{
967 if (dev)
968 put_device(&dev->dev);
969}
970EXPORT_SYMBOL(iio_device_free);
971
972static void devm_iio_device_release(struct device *dev, void *res)
973{
974 iio_device_free(*(struct iio_dev **)res);
975}
976
977static int devm_iio_device_match(struct device *dev, void *res, void *data)
978{
979 struct iio_dev **r = res;
980 if (!r || !*r) {
981 WARN_ON(!r || !*r);
982 return 0;
983 }
984 return *r == data;
985}
986
987struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
988{
989 struct iio_dev **ptr, *iio_dev;
990
991 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
992 GFP_KERNEL);
993 if (!ptr)
994 return NULL;
995
996
997 iio_dev = iio_device_alloc(sizeof_priv);
998 if (iio_dev) {
999 *ptr = iio_dev;
1000 devres_add(dev, ptr);
1001 } else {
1002 devres_free(ptr);
1003 }
1004
1005 return iio_dev;
1006}
1007EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1008
1009void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1010{
1011 int rc;
1012
1013 rc = devres_release(dev, devm_iio_device_release,
1014 devm_iio_device_match, iio_dev);
1015 WARN_ON(rc);
1016}
1017EXPORT_SYMBOL_GPL(devm_iio_device_free);
1018
1019
1020
1021
1022static int iio_chrdev_open(struct inode *inode, struct file *filp)
1023{
1024 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1025 struct iio_dev, chrdev);
1026
1027 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1028 return -EBUSY;
1029
1030 iio_device_get(indio_dev);
1031
1032 filp->private_data = indio_dev;
1033
1034 return 0;
1035}
1036
1037
1038
1039
1040static int iio_chrdev_release(struct inode *inode, struct file *filp)
1041{
1042 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1043 struct iio_dev, chrdev);
1044 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1045 iio_device_put(indio_dev);
1046
1047 return 0;
1048}
1049
1050
1051
1052static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1053{
1054 struct iio_dev *indio_dev = filp->private_data;
1055 int __user *ip = (int __user *)arg;
1056 int fd;
1057
1058 if (!indio_dev->info)
1059 return -ENODEV;
1060
1061 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1062 fd = iio_event_getfd(indio_dev);
1063 if (copy_to_user(ip, &fd, sizeof(fd)))
1064 return -EFAULT;
1065 return 0;
1066 }
1067 return -EINVAL;
1068}
1069
1070static const struct file_operations iio_buffer_fileops = {
1071 .read = iio_buffer_read_first_n_outer_addr,
1072 .release = iio_chrdev_release,
1073 .open = iio_chrdev_open,
1074 .poll = iio_buffer_poll_addr,
1075 .owner = THIS_MODULE,
1076 .llseek = noop_llseek,
1077 .unlocked_ioctl = iio_ioctl,
1078 .compat_ioctl = iio_ioctl,
1079};
1080
1081static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1082
1083int iio_device_register(struct iio_dev *indio_dev)
1084{
1085 int ret;
1086
1087
1088 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1089 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1090
1091
1092 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1093
1094 ret = iio_device_register_debugfs(indio_dev);
1095 if (ret) {
1096 dev_err(indio_dev->dev.parent,
1097 "Failed to register debugfs interfaces\n");
1098 goto error_ret;
1099 }
1100 ret = iio_device_register_sysfs(indio_dev);
1101 if (ret) {
1102 dev_err(indio_dev->dev.parent,
1103 "Failed to register sysfs interfaces\n");
1104 goto error_unreg_debugfs;
1105 }
1106 ret = iio_device_register_eventset(indio_dev);
1107 if (ret) {
1108 dev_err(indio_dev->dev.parent,
1109 "Failed to register event set\n");
1110 goto error_free_sysfs;
1111 }
1112 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1113 iio_device_register_trigger_consumer(indio_dev);
1114
1115 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1116 indio_dev->setup_ops == NULL)
1117 indio_dev->setup_ops = &noop_ring_setup_ops;
1118
1119 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1120 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1121 indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
1122 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1123 if (ret < 0)
1124 goto error_unreg_eventset;
1125
1126 ret = device_add(&indio_dev->dev);
1127 if (ret < 0)
1128 goto error_cdev_del;
1129
1130 return 0;
1131error_cdev_del:
1132 cdev_del(&indio_dev->chrdev);
1133error_unreg_eventset:
1134 iio_device_unregister_eventset(indio_dev);
1135error_free_sysfs:
1136 iio_device_unregister_sysfs(indio_dev);
1137error_unreg_debugfs:
1138 iio_device_unregister_debugfs(indio_dev);
1139error_ret:
1140 return ret;
1141}
1142EXPORT_SYMBOL(iio_device_register);
1143
1144void iio_device_unregister(struct iio_dev *indio_dev)
1145{
1146 mutex_lock(&indio_dev->info_exist_lock);
1147
1148 device_del(&indio_dev->dev);
1149
1150 if (indio_dev->chrdev.dev)
1151 cdev_del(&indio_dev->chrdev);
1152 iio_device_unregister_debugfs(indio_dev);
1153
1154 iio_disable_all_buffers(indio_dev);
1155
1156 indio_dev->info = NULL;
1157
1158 iio_device_wakeup_eventset(indio_dev);
1159 iio_buffer_wakeup_poll(indio_dev);
1160
1161 mutex_unlock(&indio_dev->info_exist_lock);
1162}
1163EXPORT_SYMBOL(iio_device_unregister);
1164subsys_initcall(iio_init);
1165module_exit(iio_exit);
1166
1167MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1168MODULE_DESCRIPTION("Industrial I/O core");
1169MODULE_LICENSE("GPL");
1170
