1 /* The industrial I/O core
3 * Copyright (c) 2008 Jonathan Cameron
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.
9 * Based on elements of hwmon and input subsystems.
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>
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>
27 #include "iio_core_trigger.h"
31 /* IDA to assign each registered device a unique id*/
32 static DEFINE_IDA(iio_ida);
34 static dev_t iio_devt;
36 #define IIO_DEV_MAX 256
37 struct bus_type iio_bus_type = {
40 EXPORT_SYMBOL(iio_bus_type);
42 static const char * const iio_data_type_name[] = {
44 [IIO_PROCESSED] = "input",
47 static const char * const iio_direction[] = {
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",
59 [IIO_LIGHT] = "illuminance",
60 [IIO_INTENSITY] = "intensity",
61 [IIO_PROXIMITY] = "proximity",
63 [IIO_INCLI] = "incli",
66 [IIO_TIMESTAMP] = "timestamp",
67 [IIO_CAPACITANCE] = "capacitance",
70 static const char * const iio_modifier_names[] = {
74 [IIO_MOD_LIGHT_BOTH] = "both",
75 [IIO_MOD_LIGHT_IR] = "ir",
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",
92 * struct iio_detected_event_list - list element for events that have occurred
93 * @list: linked list header
94 * @ev: the event itself
96 struct iio_detected_event_list {
97 struct list_head list;
98 struct iio_event_data ev;
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.
111 struct iio_event_interface {
112 wait_queue_head_t wait;
113 struct mutex event_list_lock;
114 struct list_head det_events;
117 struct list_head dev_attr_list;
119 struct attribute_group group;
122 int iio_push_event(struct iio_dev *dev_info, u64 ev_code, s64 timestamp)
124 struct iio_event_interface *ev_int = dev_info->event_interface;
125 struct iio_detected_event_list *ev;
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);
135 ev = kmalloc(sizeof(*ev), GFP_KERNEL);
138 mutex_unlock(&ev_int->event_list_lock);
142 ev->ev.timestamp = timestamp;
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);
149 mutex_unlock(&ev_int->event_list_lock);
154 EXPORT_SYMBOL(iio_push_event);
156 /* This turns up an awful lot */
157 ssize_t iio_read_const_attr(struct device *dev,
158 struct device_attribute *attr,
161 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
163 EXPORT_SYMBOL(iio_read_const_attr);
165 static ssize_t iio_event_chrdev_read(struct file *filep,
170 struct iio_event_interface *ev_int = filep->private_data;
171 struct iio_detected_event_list *el;
175 mutex_lock(&ev_int->event_list_lock);
176 if (list_empty(&ev_int->det_events)) {
177 if (filep->f_flags & O_NONBLOCK) {
179 goto error_mutex_unlock;
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,
188 /* Single access device so no one else can get the data */
189 mutex_lock(&ev_int->event_list_lock);
192 el = list_first_entry(&ev_int->det_events,
193 struct iio_detected_event_list,
196 if (copy_to_user(buf, &(el->ev), len)) {
198 goto error_mutex_unlock;
201 ev_int->current_events--;
202 mutex_unlock(&ev_int->event_list_lock);
208 mutex_unlock(&ev_int->event_list_lock);
214 static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
216 struct iio_event_interface *ev_int = filep->private_data;
217 struct iio_detected_event_list *el, *t;
219 mutex_lock(&ev_int->event_list_lock);
220 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
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.
226 list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
230 ev_int->current_events = 0;
231 mutex_unlock(&ev_int->event_list_lock);
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,
243 static int iio_event_getfd(struct iio_dev *indio_dev)
245 if (indio_dev->event_interface == NULL)
248 mutex_lock(&indio_dev->event_interface->event_list_lock);
249 if (test_and_set_bit(IIO_BUSY_BIT_POS,
250 &indio_dev->event_interface->flags)) {
251 mutex_unlock(&indio_dev->event_interface->event_list_lock);
254 mutex_unlock(&indio_dev->event_interface->event_list_lock);
255 return anon_inode_getfd("iio:event",
256 &iio_event_chrdev_fileops,
257 indio_dev->event_interface, O_RDONLY);
260 static int __init iio_init(void)
264 /* Register sysfs bus */
265 ret = bus_register(&iio_bus_type);
268 "%s could not register bus type\n",
273 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
275 printk(KERN_ERR "%s: failed to allocate char dev region\n",
277 goto error_unregister_bus_type;
282 error_unregister_bus_type:
283 bus_unregister(&iio_bus_type);
288 static void __exit iio_exit(void)
291 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
292 bus_unregister(&iio_bus_type);
295 static ssize_t iio_read_channel_info(struct device *dev,
296 struct device_attribute *attr,
299 struct iio_dev *indio_dev = dev_get_drvdata(dev);
300 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
302 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
303 &val, &val2, this_attr->address);
308 if (ret == IIO_VAL_INT)
309 return sprintf(buf, "%d\n", val);
310 else if (ret == IIO_VAL_INT_PLUS_MICRO) {
312 return sprintf(buf, "-%d.%06u\n", val, -val2);
314 return sprintf(buf, "%d.%06u\n", val, val2);
315 } else if (ret == IIO_VAL_INT_PLUS_NANO) {
317 return sprintf(buf, "-%d.%09u\n", val, -val2);
319 return sprintf(buf, "%d.%09u\n", val, val2);
324 static ssize_t iio_write_channel_info(struct device *dev,
325 struct device_attribute *attr,
329 struct iio_dev *indio_dev = dev_get_drvdata(dev);
330 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
331 int ret, integer = 0, fract = 0, fract_mult = 100000;
332 bool integer_part = true, negative = false;
334 /* Assumes decimal - precision based on number of digits */
335 if (!indio_dev->info->write_raw)
338 if (indio_dev->info->write_raw_get_fmt)
339 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
340 this_attr->c, this_attr->address)) {
341 case IIO_VAL_INT_PLUS_MICRO:
344 case IIO_VAL_INT_PLUS_NANO:
345 fract_mult = 100000000;
357 if ('0' <= *buf && *buf <= '9') {
359 integer = integer*10 + *buf - '0';
361 fract += fract_mult*(*buf - '0');
366 } else if (*buf == '\n') {
367 if (*(buf + 1) == '\0')
371 } else if (*buf == '.') {
372 integer_part = false;
385 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
386 integer, fract, this_attr->address);
394 int __iio_device_attr_init(struct device_attribute *dev_attr,
396 struct iio_chan_spec const *chan,
397 ssize_t (*readfunc)(struct device *dev,
398 struct device_attribute *attr,
400 ssize_t (*writefunc)(struct device *dev,
401 struct device_attribute *attr,
407 char *name_format, *full_postfix;
408 sysfs_attr_init(&dev_attr->attr);
410 /* Build up postfix of <extend_name>_<modifier>_postfix */
411 if (chan->modified) {
412 if (chan->extend_name)
413 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
414 iio_modifier_names[chan
419 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
420 iio_modifier_names[chan
424 if (chan->extend_name == NULL)
425 full_postfix = kstrdup(postfix, GFP_KERNEL);
427 full_postfix = kasprintf(GFP_KERNEL,
432 if (full_postfix == NULL) {
437 if (chan->differential) { /* Differential can not have modifier */
440 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
441 iio_direction[chan->output],
442 iio_chan_type_name_spec[chan->type],
443 iio_chan_type_name_spec[chan->type],
445 else if (chan->indexed)
447 = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
448 iio_direction[chan->output],
449 iio_chan_type_name_spec[chan->type],
451 iio_chan_type_name_spec[chan->type],
455 WARN_ON("Differential channels must be indexed\n");
457 goto error_free_full_postfix;
459 } else { /* Single ended */
462 = kasprintf(GFP_KERNEL, "%s_%s_%s",
463 iio_direction[chan->output],
464 iio_chan_type_name_spec[chan->type],
466 else if (chan->indexed)
468 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
469 iio_direction[chan->output],
470 iio_chan_type_name_spec[chan->type],
475 = kasprintf(GFP_KERNEL, "%s_%s_%s",
476 iio_direction[chan->output],
477 iio_chan_type_name_spec[chan->type],
480 if (name_format == NULL) {
482 goto error_free_full_postfix;
484 dev_attr->attr.name = kasprintf(GFP_KERNEL,
488 if (dev_attr->attr.name == NULL) {
490 goto error_free_name_format;
494 dev_attr->attr.mode |= S_IRUGO;
495 dev_attr->show = readfunc;
499 dev_attr->attr.mode |= S_IWUSR;
500 dev_attr->store = writefunc;
507 error_free_name_format:
509 error_free_full_postfix:
515 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
517 kfree(dev_attr->attr.name);
520 int __iio_add_chan_devattr(const char *postfix,
521 struct iio_chan_spec const *chan,
522 ssize_t (*readfunc)(struct device *dev,
523 struct device_attribute *attr,
525 ssize_t (*writefunc)(struct device *dev,
526 struct device_attribute *attr,
532 struct list_head *attr_list)
535 struct iio_dev_attr *iio_attr, *t;
537 iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
538 if (iio_attr == NULL) {
542 ret = __iio_device_attr_init(&iio_attr->dev_attr,
544 readfunc, writefunc, generic);
546 goto error_iio_dev_attr_free;
548 iio_attr->address = mask;
549 list_for_each_entry(t, attr_list, l)
550 if (strcmp(t->dev_attr.attr.name,
551 iio_attr->dev_attr.attr.name) == 0) {
553 dev_err(dev, "tried to double register : %s\n",
554 t->dev_attr.attr.name);
556 goto error_device_attr_deinit;
558 list_add(&iio_attr->l, attr_list);
562 error_device_attr_deinit:
563 __iio_device_attr_deinit(&iio_attr->dev_attr);
564 error_iio_dev_attr_free:
570 static int iio_device_add_channel_sysfs(struct iio_dev *dev_info,
571 struct iio_chan_spec const *chan)
573 int ret, i, attrcount = 0;
575 if (chan->channel < 0)
578 ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val],
580 &iio_read_channel_info,
582 &iio_write_channel_info : NULL),
586 &dev_info->channel_attr_list);
591 for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
592 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
594 &iio_read_channel_info,
595 &iio_write_channel_info,
599 &dev_info->channel_attr_list);
600 if (ret == -EBUSY && (i%2 == 0)) {
613 static void iio_device_remove_and_free_read_attr(struct iio_dev *dev_info,
614 struct iio_dev_attr *p)
616 kfree(p->dev_attr.attr.name);
620 static ssize_t iio_show_dev_name(struct device *dev,
621 struct device_attribute *attr,
624 struct iio_dev *indio_dev = dev_get_drvdata(dev);
625 return sprintf(buf, "%s\n", indio_dev->name);
628 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
630 static int iio_device_register_sysfs(struct iio_dev *dev_info)
632 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
633 struct iio_dev_attr *p, *n;
634 struct attribute **attr;
636 /* First count elements in any existing group */
637 if (dev_info->info->attrs) {
638 attr = dev_info->info->attrs->attrs;
639 while (*attr++ != NULL)
642 attrcount = attrcount_orig;
644 * New channel registration method - relies on the fact a group does
645 * not need to be initialized if it is name is NULL.
647 INIT_LIST_HEAD(&dev_info->channel_attr_list);
648 if (dev_info->channels)
649 for (i = 0; i < dev_info->num_channels; i++) {
650 ret = iio_device_add_channel_sysfs(dev_info,
654 goto error_clear_attrs;
661 dev_info->chan_attr_group.attrs
662 = kzalloc(sizeof(dev_info->chan_attr_group.attrs[0])*
665 if (dev_info->chan_attr_group.attrs == NULL) {
667 goto error_clear_attrs;
669 /* Copy across original attributes */
670 if (dev_info->info->attrs)
671 memcpy(dev_info->chan_attr_group.attrs,
672 dev_info->info->attrs->attrs,
673 sizeof(dev_info->chan_attr_group.attrs[0])
675 attrn = attrcount_orig;
676 /* Add all elements from the list. */
677 list_for_each_entry(p, &dev_info->channel_attr_list, l)
678 dev_info->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
680 dev_info->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
682 dev_info->groups[dev_info->groupcounter++] =
683 &dev_info->chan_attr_group;
688 list_for_each_entry_safe(p, n,
689 &dev_info->channel_attr_list, l) {
691 iio_device_remove_and_free_read_attr(dev_info, p);
697 static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
700 struct iio_dev_attr *p, *n;
702 list_for_each_entry_safe(p, n, &dev_info->channel_attr_list, l) {
704 iio_device_remove_and_free_read_attr(dev_info, p);
706 kfree(dev_info->chan_attr_group.attrs);
709 static const char * const iio_ev_type_text[] = {
710 [IIO_EV_TYPE_THRESH] = "thresh",
711 [IIO_EV_TYPE_MAG] = "mag",
712 [IIO_EV_TYPE_ROC] = "roc",
713 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
714 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
717 static const char * const iio_ev_dir_text[] = {
718 [IIO_EV_DIR_EITHER] = "either",
719 [IIO_EV_DIR_RISING] = "rising",
720 [IIO_EV_DIR_FALLING] = "falling"
723 static ssize_t iio_ev_state_store(struct device *dev,
724 struct device_attribute *attr,
728 struct iio_dev *indio_dev = dev_get_drvdata(dev);
729 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
733 ret = strtobool(buf, &val);
737 ret = indio_dev->info->write_event_config(indio_dev,
740 return (ret < 0) ? ret : len;
743 static ssize_t iio_ev_state_show(struct device *dev,
744 struct device_attribute *attr,
747 struct iio_dev *indio_dev = dev_get_drvdata(dev);
748 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
749 int val = indio_dev->info->read_event_config(indio_dev,
755 return sprintf(buf, "%d\n", val);
758 static ssize_t iio_ev_value_show(struct device *dev,
759 struct device_attribute *attr,
762 struct iio_dev *indio_dev = dev_get_drvdata(dev);
763 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
766 ret = indio_dev->info->read_event_value(indio_dev,
767 this_attr->address, &val);
771 return sprintf(buf, "%d\n", val);
774 static ssize_t iio_ev_value_store(struct device *dev,
775 struct device_attribute *attr,
779 struct iio_dev *indio_dev = dev_get_drvdata(dev);
780 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
784 ret = strict_strtoul(buf, 10, &val);
788 ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
796 static int iio_device_add_event_sysfs(struct iio_dev *dev_info,
797 struct iio_chan_spec const *chan)
799 int ret = 0, i, attrcount = 0;
802 if (!chan->event_mask)
805 for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
806 postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
807 iio_ev_type_text[i/IIO_EV_DIR_MAX],
808 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
809 if (postfix == NULL) {
814 mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
817 else if (chan->differential)
818 mask = IIO_EVENT_CODE(chan->type,
826 mask = IIO_UNMOD_EVENT_CODE(chan->type,
831 ret = __iio_add_chan_devattr(postfix,
838 &dev_info->event_interface->
844 postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
845 iio_ev_type_text[i/IIO_EV_DIR_MAX],
846 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
847 if (postfix == NULL) {
851 ret = __iio_add_chan_devattr(postfix, chan,
857 &dev_info->event_interface->
869 static inline void __iio_remove_event_config_attrs(struct iio_dev *dev_info)
871 struct iio_dev_attr *p, *n;
872 list_for_each_entry_safe(p, n,
873 &dev_info->event_interface->
875 kfree(p->dev_attr.attr.name);
880 static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info)
882 int j, ret, attrcount = 0;
884 INIT_LIST_HEAD(&dev_info->event_interface->dev_attr_list);
885 /* Dynically created from the channels array */
886 for (j = 0; j < dev_info->num_channels; j++) {
887 ret = iio_device_add_event_sysfs(dev_info,
888 &dev_info->channels[j]);
890 goto error_clear_attrs;
896 __iio_remove_event_config_attrs(dev_info);
901 static bool iio_check_for_dynamic_events(struct iio_dev *dev_info)
905 for (j = 0; j < dev_info->num_channels; j++)
906 if (dev_info->channels[j].event_mask != 0)
911 static void iio_setup_ev_int(struct iio_event_interface *ev_int)
913 mutex_init(&ev_int->event_list_lock);
914 /* discussion point - make this variable? */
915 ev_int->max_events = 10;
916 ev_int->current_events = 0;
917 INIT_LIST_HEAD(&ev_int->det_events);
918 init_waitqueue_head(&ev_int->wait);
921 static const char *iio_event_group_name = "events";
922 static int iio_device_register_eventset(struct iio_dev *dev_info)
924 struct iio_dev_attr *p;
925 int ret = 0, attrcount_orig = 0, attrcount, attrn;
926 struct attribute **attr;
928 if (!(dev_info->info->event_attrs ||
929 iio_check_for_dynamic_events(dev_info)))
932 dev_info->event_interface =
933 kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
934 if (dev_info->event_interface == NULL) {
939 iio_setup_ev_int(dev_info->event_interface);
940 if (dev_info->info->event_attrs != NULL) {
941 attr = dev_info->info->event_attrs->attrs;
942 while (*attr++ != NULL)
945 attrcount = attrcount_orig;
946 if (dev_info->channels) {
947 ret = __iio_add_event_config_attrs(dev_info);
949 goto error_free_setup_event_lines;
953 dev_info->event_interface->group.name = iio_event_group_name;
954 dev_info->event_interface->group.attrs =
955 kzalloc(sizeof(dev_info->event_interface->group.attrs[0])
958 if (dev_info->event_interface->group.attrs == NULL) {
960 goto error_free_setup_event_lines;
962 if (dev_info->info->event_attrs)
963 memcpy(dev_info->event_interface->group.attrs,
964 dev_info->info->event_attrs->attrs,
965 sizeof(dev_info->event_interface->group.attrs[0])
967 attrn = attrcount_orig;
968 /* Add all elements from the list. */
969 list_for_each_entry(p,
970 &dev_info->event_interface->dev_attr_list,
972 dev_info->event_interface->group.attrs[attrn++] =
975 dev_info->groups[dev_info->groupcounter++] =
976 &dev_info->event_interface->group;
980 error_free_setup_event_lines:
981 __iio_remove_event_config_attrs(dev_info);
982 kfree(dev_info->event_interface);
988 static void iio_device_unregister_eventset(struct iio_dev *dev_info)
990 if (dev_info->event_interface == NULL)
992 __iio_remove_event_config_attrs(dev_info);
993 kfree(dev_info->event_interface->group.attrs);
994 kfree(dev_info->event_interface);
997 static void iio_dev_release(struct device *device)
999 struct iio_dev *dev_info = container_of(device, struct iio_dev, dev);
1000 cdev_del(&dev_info->chrdev);
1001 if (dev_info->modes & INDIO_RING_TRIGGERED)
1002 iio_device_unregister_trigger_consumer(dev_info);
1003 iio_device_unregister_eventset(dev_info);
1004 iio_device_unregister_sysfs(dev_info);
1005 ida_simple_remove(&iio_ida, dev_info->id);
1009 static struct device_type iio_dev_type = {
1010 .name = "iio_device",
1011 .release = iio_dev_release,
1014 struct iio_dev *iio_allocate_device(int sizeof_priv)
1016 struct iio_dev *dev;
1019 alloc_size = sizeof(struct iio_dev);
1021 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1022 alloc_size += sizeof_priv;
1024 /* ensure 32-byte alignment of whole construct ? */
1025 alloc_size += IIO_ALIGN - 1;
1027 dev = kzalloc(alloc_size, GFP_KERNEL);
1030 dev->dev.groups = dev->groups;
1031 dev->dev.type = &iio_dev_type;
1032 dev->dev.bus = &iio_bus_type;
1033 device_initialize(&dev->dev);
1034 dev_set_drvdata(&dev->dev, (void *)dev);
1035 mutex_init(&dev->mlock);
1040 EXPORT_SYMBOL(iio_allocate_device);
1042 void iio_free_device(struct iio_dev *dev)
1047 EXPORT_SYMBOL(iio_free_device);
1050 * iio_chrdev_open() - chrdev file open for ring buffer access and ioctls
1052 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1054 struct iio_dev *dev_info = container_of(inode->i_cdev,
1055 struct iio_dev, chrdev);
1056 filp->private_data = dev_info;
1057 iio_chrdev_ring_open(dev_info);
1062 * iio_chrdev_release() - chrdev file close ring buffer access and ioctls
1064 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1066 iio_chrdev_ring_release(container_of(inode->i_cdev,
1067 struct iio_dev, chrdev));
1071 /* Somewhat of a cross file organization violation - ioctls here are actually
1073 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1075 struct iio_dev *indio_dev = filp->private_data;
1076 int __user *ip = (int __user *)arg;
1079 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1080 fd = iio_event_getfd(indio_dev);
1081 if (copy_to_user(ip, &fd, sizeof(fd)))
1088 static const struct file_operations iio_ring_fileops = {
1089 .read = iio_ring_read_first_n_outer_addr,
1090 .release = iio_chrdev_release,
1091 .open = iio_chrdev_open,
1092 .poll = iio_ring_poll_addr,
1093 .owner = THIS_MODULE,
1094 .llseek = noop_llseek,
1095 .unlocked_ioctl = iio_ioctl,
1096 .compat_ioctl = iio_ioctl,
1099 int iio_device_register(struct iio_dev *dev_info)
1103 dev_info->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1104 if (dev_info->id < 0) {
1106 dev_err(&dev_info->dev, "Failed to get id\n");
1109 dev_set_name(&dev_info->dev, "iio:device%d", dev_info->id);
1111 /* configure elements for the chrdev */
1112 dev_info->dev.devt = MKDEV(MAJOR(iio_devt), dev_info->id);
1114 ret = iio_device_register_sysfs(dev_info);
1116 dev_err(dev_info->dev.parent,
1117 "Failed to register sysfs interfaces\n");
1118 goto error_free_ida;
1120 ret = iio_device_register_eventset(dev_info);
1122 dev_err(dev_info->dev.parent,
1123 "Failed to register event set\n");
1124 goto error_free_sysfs;
1126 if (dev_info->modes & INDIO_RING_TRIGGERED)
1127 iio_device_register_trigger_consumer(dev_info);
1129 ret = device_add(&dev_info->dev);
1131 goto error_unreg_eventset;
1132 cdev_init(&dev_info->chrdev, &iio_ring_fileops);
1133 dev_info->chrdev.owner = dev_info->info->driver_module;
1134 ret = cdev_add(&dev_info->chrdev, dev_info->dev.devt, 1);
1136 goto error_del_device;
1140 device_del(&dev_info->dev);
1141 error_unreg_eventset:
1142 iio_device_unregister_eventset(dev_info);
1144 iio_device_unregister_sysfs(dev_info);
1146 ida_simple_remove(&iio_ida, dev_info->id);
1150 EXPORT_SYMBOL(iio_device_register);
1152 void iio_device_unregister(struct iio_dev *dev_info)
1154 device_unregister(&dev_info->dev);
1156 EXPORT_SYMBOL(iio_device_unregister);
1157 subsys_initcall(iio_init);
1158 module_exit(iio_exit);
1160 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
1161 MODULE_DESCRIPTION("Industrial I/O core");
1162 MODULE_LICENSE("GPL");