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Merge git://github.com/herbertx/crypto
[mirror_ubuntu-eoan-kernel.git] / drivers / staging / 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 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/idr.h>
15 #include <linux/kdev_t.h>
16 #include <linux/err.h>
17 #include <linux/device.h>
18 #include <linux/fs.h>
19 #include <linux/poll.h>
20 #include <linux/sched.h>
21 #include <linux/wait.h>
22 #include <linux/cdev.h>
23 #include <linux/slab.h>
24 #include <linux/anon_inodes.h>
25 #include "iio.h"
26 #include "iio_core.h"
27 #include "iio_core_trigger.h"
28 #include "chrdev.h"
29 #include "sysfs.h"
30
31 /* IDA to assign each registered device a unique id*/
32 static DEFINE_IDA(iio_ida);
33
34 static dev_t iio_devt;
35
36 #define IIO_DEV_MAX 256
37 struct bus_type iio_bus_type = {
38 .name = "iio",
39 };
40 EXPORT_SYMBOL(iio_bus_type);
41
42 static const char * const iio_data_type_name[] = {
43 [IIO_RAW] = "raw",
44 [IIO_PROCESSED] = "input",
45 };
46
47 static const char * const iio_direction[] = {
48 [0] = "in",
49 [1] = "out",
50 };
51
52 static const char * const iio_chan_type_name_spec[] = {
53 [IIO_VOLTAGE] = "voltage",
54 [IIO_CURRENT] = "current",
55 [IIO_POWER] = "power",
56 [IIO_ACCEL] = "accel",
57 [IIO_ANGL_VEL] = "anglvel",
58 [IIO_MAGN] = "magn",
59 [IIO_LIGHT] = "illuminance",
60 [IIO_INTENSITY] = "intensity",
61 [IIO_PROXIMITY] = "proximity",
62 [IIO_TEMP] = "temp",
63 [IIO_INCLI] = "incli",
64 [IIO_ROT] = "rot",
65 [IIO_ANGL] = "angl",
66 [IIO_TIMESTAMP] = "timestamp",
67 [IIO_CAPACITANCE] = "capacitance",
68 };
69
70 static const char * const iio_modifier_names[] = {
71 [IIO_MOD_X] = "x",
72 [IIO_MOD_Y] = "y",
73 [IIO_MOD_Z] = "z",
74 [IIO_MOD_LIGHT_BOTH] = "both",
75 [IIO_MOD_LIGHT_IR] = "ir",
76 };
77
78 /* relies on pairs of these shared then separate */
79 static const char * const iio_chan_info_postfix[] = {
80 [IIO_CHAN_INFO_SCALE_SHARED/2] = "scale",
81 [IIO_CHAN_INFO_OFFSET_SHARED/2] = "offset",
82 [IIO_CHAN_INFO_CALIBSCALE_SHARED/2] = "calibscale",
83 [IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias",
84 [IIO_CHAN_INFO_PEAK_SHARED/2] = "peak_raw",
85 [IIO_CHAN_INFO_PEAK_SCALE_SHARED/2] = "peak_scale",
86 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SHARED/2]
87 = "quadrature_correction_raw",
88 [IIO_CHAN_INFO_AVERAGE_RAW_SHARED/2] = "mean_raw",
89 };
90
91 /**
92 * struct iio_detected_event_list - list element for events that have occurred
93 * @list: linked list header
94 * @ev: the event itself
95 */
96 struct iio_detected_event_list {
97 struct list_head list;
98 struct iio_event_data ev;
99 };
100
101 /**
102 * struct iio_event_interface - chrdev interface for an event line
103 * @dev: device assocated with event interface
104 * @wait: wait queue to allow blocking reads of events
105 * @event_list_lock: mutex to protect the list of detected events
106 * @det_events: list of detected events
107 * @max_events: maximum number of events before new ones are dropped
108 * @current_events: number of events in detected list
109 * @flags: file operations related flags including busy flag.
110 */
111 struct iio_event_interface {
112 wait_queue_head_t wait;
113 struct mutex event_list_lock;
114 struct list_head det_events;
115 int max_events;
116 int current_events;
117 struct list_head dev_attr_list;
118 unsigned long flags;
119 struct attribute_group group;
120 };
121
122 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
123 {
124 struct iio_event_interface *ev_int = indio_dev->event_interface;
125 struct iio_detected_event_list *ev;
126 int ret = 0;
127
128 /* Does anyone care? */
129 mutex_lock(&ev_int->event_list_lock);
130 if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
131 if (ev_int->current_events == ev_int->max_events) {
132 mutex_unlock(&ev_int->event_list_lock);
133 return 0;
134 }
135 ev = kmalloc(sizeof(*ev), GFP_KERNEL);
136 if (ev == NULL) {
137 ret = -ENOMEM;
138 mutex_unlock(&ev_int->event_list_lock);
139 goto error_ret;
140 }
141 ev->ev.id = ev_code;
142 ev->ev.timestamp = timestamp;
143
144 list_add_tail(&ev->list, &ev_int->det_events);
145 ev_int->current_events++;
146 mutex_unlock(&ev_int->event_list_lock);
147 wake_up_interruptible(&ev_int->wait);
148 } else
149 mutex_unlock(&ev_int->event_list_lock);
150
151 error_ret:
152 return ret;
153 }
154 EXPORT_SYMBOL(iio_push_event);
155
156 /* This turns up an awful lot */
157 ssize_t iio_read_const_attr(struct device *dev,
158 struct device_attribute *attr,
159 char *buf)
160 {
161 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
162 }
163 EXPORT_SYMBOL(iio_read_const_attr);
164
165 static ssize_t iio_event_chrdev_read(struct file *filep,
166 char __user *buf,
167 size_t count,
168 loff_t *f_ps)
169 {
170 struct iio_event_interface *ev_int = filep->private_data;
171 struct iio_detected_event_list *el;
172 int ret;
173 size_t len;
174
175 mutex_lock(&ev_int->event_list_lock);
176 if (list_empty(&ev_int->det_events)) {
177 if (filep->f_flags & O_NONBLOCK) {
178 ret = -EAGAIN;
179 goto error_mutex_unlock;
180 }
181 mutex_unlock(&ev_int->event_list_lock);
182 /* Blocking on device; waiting for something to be there */
183 ret = wait_event_interruptible(ev_int->wait,
184 !list_empty(&ev_int
185 ->det_events));
186 if (ret)
187 goto error_ret;
188 /* Single access device so no one else can get the data */
189 mutex_lock(&ev_int->event_list_lock);
190 }
191
192 el = list_first_entry(&ev_int->det_events,
193 struct iio_detected_event_list,
194 list);
195 len = sizeof el->ev;
196 if (copy_to_user(buf, &(el->ev), len)) {
197 ret = -EFAULT;
198 goto error_mutex_unlock;
199 }
200 list_del(&el->list);
201 ev_int->current_events--;
202 mutex_unlock(&ev_int->event_list_lock);
203 kfree(el);
204
205 return len;
206
207 error_mutex_unlock:
208 mutex_unlock(&ev_int->event_list_lock);
209 error_ret:
210
211 return ret;
212 }
213
214 static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
215 {
216 struct iio_event_interface *ev_int = filep->private_data;
217 struct iio_detected_event_list *el, *t;
218
219 mutex_lock(&ev_int->event_list_lock);
220 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
221 /*
222 * In order to maintain a clean state for reopening,
223 * clear out any awaiting events. The mask will prevent
224 * any new __iio_push_event calls running.
225 */
226 list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
227 list_del(&el->list);
228 kfree(el);
229 }
230 ev_int->current_events = 0;
231 mutex_unlock(&ev_int->event_list_lock);
232
233 return 0;
234 }
235
236 static const struct file_operations iio_event_chrdev_fileops = {
237 .read = iio_event_chrdev_read,
238 .release = iio_event_chrdev_release,
239 .owner = THIS_MODULE,
240 .llseek = noop_llseek,
241 };
242
243 static int iio_event_getfd(struct iio_dev *indio_dev)
244 {
245 int fd;
246
247 if (indio_dev->event_interface == NULL)
248 return -ENODEV;
249
250 mutex_lock(&indio_dev->event_interface->event_list_lock);
251 if (test_and_set_bit(IIO_BUSY_BIT_POS,
252 &indio_dev->event_interface->flags)) {
253 mutex_unlock(&indio_dev->event_interface->event_list_lock);
254 return -EBUSY;
255 }
256 mutex_unlock(&indio_dev->event_interface->event_list_lock);
257 fd = anon_inode_getfd("iio:event",
258 &iio_event_chrdev_fileops,
259 indio_dev->event_interface, O_RDONLY);
260 if (fd < 0) {
261 mutex_lock(&indio_dev->event_interface->event_list_lock);
262 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
263 mutex_unlock(&indio_dev->event_interface->event_list_lock);
264 }
265 return fd;
266 }
267
268 static int __init iio_init(void)
269 {
270 int ret;
271
272 /* Register sysfs bus */
273 ret = bus_register(&iio_bus_type);
274 if (ret < 0) {
275 printk(KERN_ERR
276 "%s could not register bus type\n",
277 __FILE__);
278 goto error_nothing;
279 }
280
281 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
282 if (ret < 0) {
283 printk(KERN_ERR "%s: failed to allocate char dev region\n",
284 __FILE__);
285 goto error_unregister_bus_type;
286 }
287
288 return 0;
289
290 error_unregister_bus_type:
291 bus_unregister(&iio_bus_type);
292 error_nothing:
293 return ret;
294 }
295
296 static void __exit iio_exit(void)
297 {
298 if (iio_devt)
299 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
300 bus_unregister(&iio_bus_type);
301 }
302
303 static ssize_t iio_read_channel_info(struct device *dev,
304 struct device_attribute *attr,
305 char *buf)
306 {
307 struct iio_dev *indio_dev = dev_get_drvdata(dev);
308 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
309 int val, val2;
310 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
311 &val, &val2, this_attr->address);
312
313 if (ret < 0)
314 return ret;
315
316 if (ret == IIO_VAL_INT)
317 return sprintf(buf, "%d\n", val);
318 else if (ret == IIO_VAL_INT_PLUS_MICRO) {
319 if (val2 < 0)
320 return sprintf(buf, "-%d.%06u\n", val, -val2);
321 else
322 return sprintf(buf, "%d.%06u\n", val, val2);
323 } else if (ret == IIO_VAL_INT_PLUS_NANO) {
324 if (val2 < 0)
325 return sprintf(buf, "-%d.%09u\n", val, -val2);
326 else
327 return sprintf(buf, "%d.%09u\n", val, val2);
328 } else
329 return 0;
330 }
331
332 static ssize_t iio_write_channel_info(struct device *dev,
333 struct device_attribute *attr,
334 const char *buf,
335 size_t len)
336 {
337 struct iio_dev *indio_dev = dev_get_drvdata(dev);
338 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
339 int ret, integer = 0, fract = 0, fract_mult = 100000;
340 bool integer_part = true, negative = false;
341
342 /* Assumes decimal - precision based on number of digits */
343 if (!indio_dev->info->write_raw)
344 return -EINVAL;
345
346 if (indio_dev->info->write_raw_get_fmt)
347 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
348 this_attr->c, this_attr->address)) {
349 case IIO_VAL_INT_PLUS_MICRO:
350 fract_mult = 100000;
351 break;
352 case IIO_VAL_INT_PLUS_NANO:
353 fract_mult = 100000000;
354 break;
355 default:
356 return -EINVAL;
357 }
358
359 if (buf[0] == '-') {
360 negative = true;
361 buf++;
362 }
363
364 while (*buf) {
365 if ('0' <= *buf && *buf <= '9') {
366 if (integer_part)
367 integer = integer*10 + *buf - '0';
368 else {
369 fract += fract_mult*(*buf - '0');
370 if (fract_mult == 1)
371 break;
372 fract_mult /= 10;
373 }
374 } else if (*buf == '\n') {
375 if (*(buf + 1) == '\0')
376 break;
377 else
378 return -EINVAL;
379 } else if (*buf == '.') {
380 integer_part = false;
381 } else {
382 return -EINVAL;
383 }
384 buf++;
385 }
386 if (negative) {
387 if (integer)
388 integer = -integer;
389 else
390 fract = -fract;
391 }
392
393 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
394 integer, fract, this_attr->address);
395 if (ret)
396 return ret;
397
398 return len;
399 }
400
401 static
402 int __iio_device_attr_init(struct device_attribute *dev_attr,
403 const char *postfix,
404 struct iio_chan_spec const *chan,
405 ssize_t (*readfunc)(struct device *dev,
406 struct device_attribute *attr,
407 char *buf),
408 ssize_t (*writefunc)(struct device *dev,
409 struct device_attribute *attr,
410 const char *buf,
411 size_t len),
412 bool generic)
413 {
414 int ret;
415 char *name_format, *full_postfix;
416 sysfs_attr_init(&dev_attr->attr);
417
418 /* Build up postfix of <extend_name>_<modifier>_postfix */
419 if (chan->modified) {
420 if (chan->extend_name)
421 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
422 iio_modifier_names[chan
423 ->channel2],
424 chan->extend_name,
425 postfix);
426 else
427 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
428 iio_modifier_names[chan
429 ->channel2],
430 postfix);
431 } else {
432 if (chan->extend_name == NULL)
433 full_postfix = kstrdup(postfix, GFP_KERNEL);
434 else
435 full_postfix = kasprintf(GFP_KERNEL,
436 "%s_%s",
437 chan->extend_name,
438 postfix);
439 }
440 if (full_postfix == NULL) {
441 ret = -ENOMEM;
442 goto error_ret;
443 }
444
445 if (chan->differential) { /* Differential can not have modifier */
446 if (generic)
447 name_format
448 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
449 iio_direction[chan->output],
450 iio_chan_type_name_spec[chan->type],
451 iio_chan_type_name_spec[chan->type],
452 full_postfix);
453 else if (chan->indexed)
454 name_format
455 = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
456 iio_direction[chan->output],
457 iio_chan_type_name_spec[chan->type],
458 chan->channel,
459 iio_chan_type_name_spec[chan->type],
460 chan->channel2,
461 full_postfix);
462 else {
463 WARN_ON("Differential channels must be indexed\n");
464 ret = -EINVAL;
465 goto error_free_full_postfix;
466 }
467 } else { /* Single ended */
468 if (generic)
469 name_format
470 = kasprintf(GFP_KERNEL, "%s_%s_%s",
471 iio_direction[chan->output],
472 iio_chan_type_name_spec[chan->type],
473 full_postfix);
474 else if (chan->indexed)
475 name_format
476 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
477 iio_direction[chan->output],
478 iio_chan_type_name_spec[chan->type],
479 chan->channel,
480 full_postfix);
481 else
482 name_format
483 = kasprintf(GFP_KERNEL, "%s_%s_%s",
484 iio_direction[chan->output],
485 iio_chan_type_name_spec[chan->type],
486 full_postfix);
487 }
488 if (name_format == NULL) {
489 ret = -ENOMEM;
490 goto error_free_full_postfix;
491 }
492 dev_attr->attr.name = kasprintf(GFP_KERNEL,
493 name_format,
494 chan->channel,
495 chan->channel2);
496 if (dev_attr->attr.name == NULL) {
497 ret = -ENOMEM;
498 goto error_free_name_format;
499 }
500
501 if (readfunc) {
502 dev_attr->attr.mode |= S_IRUGO;
503 dev_attr->show = readfunc;
504 }
505
506 if (writefunc) {
507 dev_attr->attr.mode |= S_IWUSR;
508 dev_attr->store = writefunc;
509 }
510 kfree(name_format);
511 kfree(full_postfix);
512
513 return 0;
514
515 error_free_name_format:
516 kfree(name_format);
517 error_free_full_postfix:
518 kfree(full_postfix);
519 error_ret:
520 return ret;
521 }
522
523 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
524 {
525 kfree(dev_attr->attr.name);
526 }
527
528 int __iio_add_chan_devattr(const char *postfix,
529 struct iio_chan_spec const *chan,
530 ssize_t (*readfunc)(struct device *dev,
531 struct device_attribute *attr,
532 char *buf),
533 ssize_t (*writefunc)(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf,
536 size_t len),
537 u64 mask,
538 bool generic,
539 struct device *dev,
540 struct list_head *attr_list)
541 {
542 int ret;
543 struct iio_dev_attr *iio_attr, *t;
544
545 iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
546 if (iio_attr == NULL) {
547 ret = -ENOMEM;
548 goto error_ret;
549 }
550 ret = __iio_device_attr_init(&iio_attr->dev_attr,
551 postfix, chan,
552 readfunc, writefunc, generic);
553 if (ret)
554 goto error_iio_dev_attr_free;
555 iio_attr->c = chan;
556 iio_attr->address = mask;
557 list_for_each_entry(t, attr_list, l)
558 if (strcmp(t->dev_attr.attr.name,
559 iio_attr->dev_attr.attr.name) == 0) {
560 if (!generic)
561 dev_err(dev, "tried to double register : %s\n",
562 t->dev_attr.attr.name);
563 ret = -EBUSY;
564 goto error_device_attr_deinit;
565 }
566 list_add(&iio_attr->l, attr_list);
567
568 return 0;
569
570 error_device_attr_deinit:
571 __iio_device_attr_deinit(&iio_attr->dev_attr);
572 error_iio_dev_attr_free:
573 kfree(iio_attr);
574 error_ret:
575 return ret;
576 }
577
578 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
579 struct iio_chan_spec const *chan)
580 {
581 int ret, i, attrcount = 0;
582
583 if (chan->channel < 0)
584 return 0;
585
586 ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val],
587 chan,
588 &iio_read_channel_info,
589 (chan->output ?
590 &iio_write_channel_info : NULL),
591 0,
592 0,
593 &indio_dev->dev,
594 &indio_dev->channel_attr_list);
595 if (ret)
596 goto error_ret;
597 attrcount++;
598
599 for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
600 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
601 chan,
602 &iio_read_channel_info,
603 &iio_write_channel_info,
604 (1 << i),
605 !(i%2),
606 &indio_dev->dev,
607 &indio_dev->channel_attr_list);
608 if (ret == -EBUSY && (i%2 == 0)) {
609 ret = 0;
610 continue;
611 }
612 if (ret < 0)
613 goto error_ret;
614 attrcount++;
615 }
616 ret = attrcount;
617 error_ret:
618 return ret;
619 }
620
621 static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
622 struct iio_dev_attr *p)
623 {
624 kfree(p->dev_attr.attr.name);
625 kfree(p);
626 }
627
628 static ssize_t iio_show_dev_name(struct device *dev,
629 struct device_attribute *attr,
630 char *buf)
631 {
632 struct iio_dev *indio_dev = dev_get_drvdata(dev);
633 return sprintf(buf, "%s\n", indio_dev->name);
634 }
635
636 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
637
638 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
639 {
640 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
641 struct iio_dev_attr *p, *n;
642 struct attribute **attr;
643
644 /* First count elements in any existing group */
645 if (indio_dev->info->attrs) {
646 attr = indio_dev->info->attrs->attrs;
647 while (*attr++ != NULL)
648 attrcount_orig++;
649 }
650 attrcount = attrcount_orig;
651 /*
652 * New channel registration method - relies on the fact a group does
653 * not need to be initialized if it is name is NULL.
654 */
655 INIT_LIST_HEAD(&indio_dev->channel_attr_list);
656 if (indio_dev->channels)
657 for (i = 0; i < indio_dev->num_channels; i++) {
658 ret = iio_device_add_channel_sysfs(indio_dev,
659 &indio_dev
660 ->channels[i]);
661 if (ret < 0)
662 goto error_clear_attrs;
663 attrcount += ret;
664 }
665
666 if (indio_dev->name)
667 attrcount++;
668
669 indio_dev->chan_attr_group.attrs
670 = kzalloc(sizeof(indio_dev->chan_attr_group.attrs[0])*
671 (attrcount + 1),
672 GFP_KERNEL);
673 if (indio_dev->chan_attr_group.attrs == NULL) {
674 ret = -ENOMEM;
675 goto error_clear_attrs;
676 }
677 /* Copy across original attributes */
678 if (indio_dev->info->attrs)
679 memcpy(indio_dev->chan_attr_group.attrs,
680 indio_dev->info->attrs->attrs,
681 sizeof(indio_dev->chan_attr_group.attrs[0])
682 *attrcount_orig);
683 attrn = attrcount_orig;
684 /* Add all elements from the list. */
685 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
686 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
687 if (indio_dev->name)
688 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
689
690 indio_dev->groups[indio_dev->groupcounter++] =
691 &indio_dev->chan_attr_group;
692
693 return 0;
694
695 error_clear_attrs:
696 list_for_each_entry_safe(p, n,
697 &indio_dev->channel_attr_list, l) {
698 list_del(&p->l);
699 iio_device_remove_and_free_read_attr(indio_dev, p);
700 }
701
702 return ret;
703 }
704
705 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
706 {
707
708 struct iio_dev_attr *p, *n;
709
710 list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
711 list_del(&p->l);
712 iio_device_remove_and_free_read_attr(indio_dev, p);
713 }
714 kfree(indio_dev->chan_attr_group.attrs);
715 }
716
717 static const char * const iio_ev_type_text[] = {
718 [IIO_EV_TYPE_THRESH] = "thresh",
719 [IIO_EV_TYPE_MAG] = "mag",
720 [IIO_EV_TYPE_ROC] = "roc",
721 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
722 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
723 };
724
725 static const char * const iio_ev_dir_text[] = {
726 [IIO_EV_DIR_EITHER] = "either",
727 [IIO_EV_DIR_RISING] = "rising",
728 [IIO_EV_DIR_FALLING] = "falling"
729 };
730
731 static ssize_t iio_ev_state_store(struct device *dev,
732 struct device_attribute *attr,
733 const char *buf,
734 size_t len)
735 {
736 struct iio_dev *indio_dev = dev_get_drvdata(dev);
737 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
738 int ret;
739 bool val;
740
741 ret = strtobool(buf, &val);
742 if (ret < 0)
743 return ret;
744
745 ret = indio_dev->info->write_event_config(indio_dev,
746 this_attr->address,
747 val);
748 return (ret < 0) ? ret : len;
749 }
750
751 static ssize_t iio_ev_state_show(struct device *dev,
752 struct device_attribute *attr,
753 char *buf)
754 {
755 struct iio_dev *indio_dev = dev_get_drvdata(dev);
756 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
757 int val = indio_dev->info->read_event_config(indio_dev,
758 this_attr->address);
759
760 if (val < 0)
761 return val;
762 else
763 return sprintf(buf, "%d\n", val);
764 }
765
766 static ssize_t iio_ev_value_show(struct device *dev,
767 struct device_attribute *attr,
768 char *buf)
769 {
770 struct iio_dev *indio_dev = dev_get_drvdata(dev);
771 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
772 int val, ret;
773
774 ret = indio_dev->info->read_event_value(indio_dev,
775 this_attr->address, &val);
776 if (ret < 0)
777 return ret;
778
779 return sprintf(buf, "%d\n", val);
780 }
781
782 static ssize_t iio_ev_value_store(struct device *dev,
783 struct device_attribute *attr,
784 const char *buf,
785 size_t len)
786 {
787 struct iio_dev *indio_dev = dev_get_drvdata(dev);
788 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
789 unsigned long val;
790 int ret;
791
792 ret = strict_strtoul(buf, 10, &val);
793 if (ret)
794 return ret;
795
796 ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
797 val);
798 if (ret < 0)
799 return ret;
800
801 return len;
802 }
803
804 static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
805 struct iio_chan_spec const *chan)
806 {
807 int ret = 0, i, attrcount = 0;
808 u64 mask = 0;
809 char *postfix;
810 if (!chan->event_mask)
811 return 0;
812
813 for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
814 postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
815 iio_ev_type_text[i/IIO_EV_DIR_MAX],
816 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
817 if (postfix == NULL) {
818 ret = -ENOMEM;
819 goto error_ret;
820 }
821 if (chan->modified)
822 mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
823 i/IIO_EV_DIR_MAX,
824 i%IIO_EV_DIR_MAX);
825 else if (chan->differential)
826 mask = IIO_EVENT_CODE(chan->type,
827 0, 0,
828 i%IIO_EV_DIR_MAX,
829 i/IIO_EV_DIR_MAX,
830 0,
831 chan->channel,
832 chan->channel2);
833 else
834 mask = IIO_UNMOD_EVENT_CODE(chan->type,
835 chan->channel,
836 i/IIO_EV_DIR_MAX,
837 i%IIO_EV_DIR_MAX);
838
839 ret = __iio_add_chan_devattr(postfix,
840 chan,
841 &iio_ev_state_show,
842 iio_ev_state_store,
843 mask,
844 0,
845 &indio_dev->dev,
846 &indio_dev->event_interface->
847 dev_attr_list);
848 kfree(postfix);
849 if (ret)
850 goto error_ret;
851 attrcount++;
852 postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
853 iio_ev_type_text[i/IIO_EV_DIR_MAX],
854 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
855 if (postfix == NULL) {
856 ret = -ENOMEM;
857 goto error_ret;
858 }
859 ret = __iio_add_chan_devattr(postfix, chan,
860 iio_ev_value_show,
861 iio_ev_value_store,
862 mask,
863 0,
864 &indio_dev->dev,
865 &indio_dev->event_interface->
866 dev_attr_list);
867 kfree(postfix);
868 if (ret)
869 goto error_ret;
870 attrcount++;
871 }
872 ret = attrcount;
873 error_ret:
874 return ret;
875 }
876
877 static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
878 {
879 struct iio_dev_attr *p, *n;
880 list_for_each_entry_safe(p, n,
881 &indio_dev->event_interface->
882 dev_attr_list, l) {
883 kfree(p->dev_attr.attr.name);
884 kfree(p);
885 }
886 }
887
888 static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
889 {
890 int j, ret, attrcount = 0;
891
892 INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
893 /* Dynically created from the channels array */
894 for (j = 0; j < indio_dev->num_channels; j++) {
895 ret = iio_device_add_event_sysfs(indio_dev,
896 &indio_dev->channels[j]);
897 if (ret < 0)
898 goto error_clear_attrs;
899 attrcount += ret;
900 }
901 return attrcount;
902
903 error_clear_attrs:
904 __iio_remove_event_config_attrs(indio_dev);
905
906 return ret;
907 }
908
909 static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
910 {
911 int j;
912
913 for (j = 0; j < indio_dev->num_channels; j++)
914 if (indio_dev->channels[j].event_mask != 0)
915 return true;
916 return false;
917 }
918
919 static void iio_setup_ev_int(struct iio_event_interface *ev_int)
920 {
921 mutex_init(&ev_int->event_list_lock);
922 /* discussion point - make this variable? */
923 ev_int->max_events = 10;
924 ev_int->current_events = 0;
925 INIT_LIST_HEAD(&ev_int->det_events);
926 init_waitqueue_head(&ev_int->wait);
927 }
928
929 static const char *iio_event_group_name = "events";
930 static int iio_device_register_eventset(struct iio_dev *indio_dev)
931 {
932 struct iio_dev_attr *p;
933 int ret = 0, attrcount_orig = 0, attrcount, attrn;
934 struct attribute **attr;
935
936 if (!(indio_dev->info->event_attrs ||
937 iio_check_for_dynamic_events(indio_dev)))
938 return 0;
939
940 indio_dev->event_interface =
941 kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
942 if (indio_dev->event_interface == NULL) {
943 ret = -ENOMEM;
944 goto error_ret;
945 }
946
947 iio_setup_ev_int(indio_dev->event_interface);
948 if (indio_dev->info->event_attrs != NULL) {
949 attr = indio_dev->info->event_attrs->attrs;
950 while (*attr++ != NULL)
951 attrcount_orig++;
952 }
953 attrcount = attrcount_orig;
954 if (indio_dev->channels) {
955 ret = __iio_add_event_config_attrs(indio_dev);
956 if (ret < 0)
957 goto error_free_setup_event_lines;
958 attrcount += ret;
959 }
960
961 indio_dev->event_interface->group.name = iio_event_group_name;
962 indio_dev->event_interface->group.attrs =
963 kzalloc(sizeof(indio_dev->event_interface->group.attrs[0])
964 *(attrcount + 1),
965 GFP_KERNEL);
966 if (indio_dev->event_interface->group.attrs == NULL) {
967 ret = -ENOMEM;
968 goto error_free_setup_event_lines;
969 }
970 if (indio_dev->info->event_attrs)
971 memcpy(indio_dev->event_interface->group.attrs,
972 indio_dev->info->event_attrs->attrs,
973 sizeof(indio_dev->event_interface->group.attrs[0])
974 *attrcount_orig);
975 attrn = attrcount_orig;
976 /* Add all elements from the list. */
977 list_for_each_entry(p,
978 &indio_dev->event_interface->dev_attr_list,
979 l)
980 indio_dev->event_interface->group.attrs[attrn++] =
981 &p->dev_attr.attr;
982 indio_dev->groups[indio_dev->groupcounter++] =
983 &indio_dev->event_interface->group;
984
985 return 0;
986
987 error_free_setup_event_lines:
988 __iio_remove_event_config_attrs(indio_dev);
989 kfree(indio_dev->event_interface);
990 error_ret:
991
992 return ret;
993 }
994
995 static void iio_device_unregister_eventset(struct iio_dev *indio_dev)
996 {
997 if (indio_dev->event_interface == NULL)
998 return;
999 __iio_remove_event_config_attrs(indio_dev);
1000 kfree(indio_dev->event_interface->group.attrs);
1001 kfree(indio_dev->event_interface);
1002 }
1003
1004 static void iio_dev_release(struct device *device)
1005 {
1006 struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
1007 cdev_del(&indio_dev->chrdev);
1008 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1009 iio_device_unregister_trigger_consumer(indio_dev);
1010 iio_device_unregister_eventset(indio_dev);
1011 iio_device_unregister_sysfs(indio_dev);
1012 }
1013
1014 static struct device_type iio_dev_type = {
1015 .name = "iio_device",
1016 .release = iio_dev_release,
1017 };
1018
1019 struct iio_dev *iio_allocate_device(int sizeof_priv)
1020 {
1021 struct iio_dev *dev;
1022 size_t alloc_size;
1023
1024 alloc_size = sizeof(struct iio_dev);
1025 if (sizeof_priv) {
1026 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1027 alloc_size += sizeof_priv;
1028 }
1029 /* ensure 32-byte alignment of whole construct ? */
1030 alloc_size += IIO_ALIGN - 1;
1031
1032 dev = kzalloc(alloc_size, GFP_KERNEL);
1033
1034 if (dev) {
1035 dev->dev.groups = dev->groups;
1036 dev->dev.type = &iio_dev_type;
1037 dev->dev.bus = &iio_bus_type;
1038 device_initialize(&dev->dev);
1039 dev_set_drvdata(&dev->dev, (void *)dev);
1040 mutex_init(&dev->mlock);
1041
1042 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1043 if (dev->id < 0) {
1044 /* cannot use a dev_err as the name isn't available */
1045 printk(KERN_ERR "Failed to get id\n");
1046 kfree(dev);
1047 return NULL;
1048 }
1049 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1050 }
1051
1052 return dev;
1053 }
1054 EXPORT_SYMBOL(iio_allocate_device);
1055
1056 void iio_free_device(struct iio_dev *dev)
1057 {
1058 if (dev) {
1059 ida_simple_remove(&iio_ida, dev->id);
1060 kfree(dev);
1061 }
1062 }
1063 EXPORT_SYMBOL(iio_free_device);
1064
1065 /**
1066 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1067 **/
1068 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1069 {
1070 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1071 struct iio_dev, chrdev);
1072 filp->private_data = indio_dev;
1073
1074 return iio_chrdev_buffer_open(indio_dev);
1075 }
1076
1077 /**
1078 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1079 **/
1080 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1081 {
1082 iio_chrdev_buffer_release(container_of(inode->i_cdev,
1083 struct iio_dev, chrdev));
1084 return 0;
1085 }
1086
1087 /* Somewhat of a cross file organization violation - ioctls here are actually
1088 * event related */
1089 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1090 {
1091 struct iio_dev *indio_dev = filp->private_data;
1092 int __user *ip = (int __user *)arg;
1093 int fd;
1094
1095 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1096 fd = iio_event_getfd(indio_dev);
1097 if (copy_to_user(ip, &fd, sizeof(fd)))
1098 return -EFAULT;
1099 return 0;
1100 }
1101 return -EINVAL;
1102 }
1103
1104 static const struct file_operations iio_buffer_fileops = {
1105 .read = iio_buffer_read_first_n_outer_addr,
1106 .release = iio_chrdev_release,
1107 .open = iio_chrdev_open,
1108 .poll = iio_buffer_poll_addr,
1109 .owner = THIS_MODULE,
1110 .llseek = noop_llseek,
1111 .unlocked_ioctl = iio_ioctl,
1112 .compat_ioctl = iio_ioctl,
1113 };
1114
1115 int iio_device_register(struct iio_dev *indio_dev)
1116 {
1117 int ret;
1118
1119 /* configure elements for the chrdev */
1120 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1121
1122 ret = iio_device_register_sysfs(indio_dev);
1123 if (ret) {
1124 dev_err(indio_dev->dev.parent,
1125 "Failed to register sysfs interfaces\n");
1126 goto error_ret;
1127 }
1128 ret = iio_device_register_eventset(indio_dev);
1129 if (ret) {
1130 dev_err(indio_dev->dev.parent,
1131 "Failed to register event set\n");
1132 goto error_free_sysfs;
1133 }
1134 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1135 iio_device_register_trigger_consumer(indio_dev);
1136
1137 ret = device_add(&indio_dev->dev);
1138 if (ret < 0)
1139 goto error_unreg_eventset;
1140 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1141 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1142 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1143 if (ret < 0)
1144 goto error_del_device;
1145 return 0;
1146
1147 error_del_device:
1148 device_del(&indio_dev->dev);
1149 error_unreg_eventset:
1150 iio_device_unregister_eventset(indio_dev);
1151 error_free_sysfs:
1152 iio_device_unregister_sysfs(indio_dev);
1153 error_ret:
1154 return ret;
1155 }
1156 EXPORT_SYMBOL(iio_device_register);
1157
1158 void iio_device_unregister(struct iio_dev *indio_dev)
1159 {
1160 device_unregister(&indio_dev->dev);
1161 }
1162 EXPORT_SYMBOL(iio_device_unregister);
1163 subsys_initcall(iio_init);
1164 module_exit(iio_exit);
1165
1166 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
1167 MODULE_DESCRIPTION("Industrial I/O core");
1168 MODULE_LICENSE("GPL");
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