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",
57 [IIO_ANGL_VEL] = "anglvel",
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 *indio_dev, u64 ev_code, s64 timestamp)
124 struct iio_event_interface *ev_int = indio_dev->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;
172 size_t len = sizeof(el->ev);
178 mutex_lock(&ev_int->event_list_lock);
179 if (list_empty(&ev_int->det_events)) {
180 if (filep->f_flags & O_NONBLOCK) {
182 goto error_mutex_unlock;
184 mutex_unlock(&ev_int->event_list_lock);
185 /* Blocking on device; waiting for something to be there */
186 ret = wait_event_interruptible(ev_int->wait,
191 /* Single access device so no one else can get the data */
192 mutex_lock(&ev_int->event_list_lock);
195 el = list_first_entry(&ev_int->det_events,
196 struct iio_detected_event_list,
198 if (copy_to_user(buf, &(el->ev), len)) {
200 goto error_mutex_unlock;
203 ev_int->current_events--;
204 mutex_unlock(&ev_int->event_list_lock);
210 mutex_unlock(&ev_int->event_list_lock);
216 static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
218 struct iio_event_interface *ev_int = filep->private_data;
219 struct iio_detected_event_list *el, *t;
221 mutex_lock(&ev_int->event_list_lock);
222 clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
224 * In order to maintain a clean state for reopening,
225 * clear out any awaiting events. The mask will prevent
226 * any new __iio_push_event calls running.
228 list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
232 ev_int->current_events = 0;
233 mutex_unlock(&ev_int->event_list_lock);
238 static const struct file_operations iio_event_chrdev_fileops = {
239 .read = iio_event_chrdev_read,
240 .release = iio_event_chrdev_release,
241 .owner = THIS_MODULE,
242 .llseek = noop_llseek,
245 static int iio_event_getfd(struct iio_dev *indio_dev)
249 if (indio_dev->event_interface == NULL)
252 mutex_lock(&indio_dev->event_interface->event_list_lock);
253 if (test_and_set_bit(IIO_BUSY_BIT_POS,
254 &indio_dev->event_interface->flags)) {
255 mutex_unlock(&indio_dev->event_interface->event_list_lock);
258 mutex_unlock(&indio_dev->event_interface->event_list_lock);
259 fd = anon_inode_getfd("iio:event",
260 &iio_event_chrdev_fileops,
261 indio_dev->event_interface, O_RDONLY);
263 mutex_lock(&indio_dev->event_interface->event_list_lock);
264 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->event_interface->flags);
265 mutex_unlock(&indio_dev->event_interface->event_list_lock);
270 static int __init iio_init(void)
274 /* Register sysfs bus */
275 ret = bus_register(&iio_bus_type);
278 "%s could not register bus type\n",
283 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
285 printk(KERN_ERR "%s: failed to allocate char dev region\n",
287 goto error_unregister_bus_type;
292 error_unregister_bus_type:
293 bus_unregister(&iio_bus_type);
298 static void __exit iio_exit(void)
301 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
302 bus_unregister(&iio_bus_type);
305 static ssize_t iio_read_channel_info(struct device *dev,
306 struct device_attribute *attr,
309 struct iio_dev *indio_dev = dev_get_drvdata(dev);
310 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
312 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
313 &val, &val2, this_attr->address);
318 if (ret == IIO_VAL_INT)
319 return sprintf(buf, "%d\n", val);
320 else if (ret == IIO_VAL_INT_PLUS_MICRO) {
322 return sprintf(buf, "-%d.%06u\n", val, -val2);
324 return sprintf(buf, "%d.%06u\n", val, val2);
325 } else if (ret == IIO_VAL_INT_PLUS_NANO) {
327 return sprintf(buf, "-%d.%09u\n", val, -val2);
329 return sprintf(buf, "%d.%09u\n", val, val2);
334 static ssize_t iio_write_channel_info(struct device *dev,
335 struct device_attribute *attr,
339 struct iio_dev *indio_dev = dev_get_drvdata(dev);
340 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
341 int ret, integer = 0, fract = 0, fract_mult = 100000;
342 bool integer_part = true, negative = false;
344 /* Assumes decimal - precision based on number of digits */
345 if (!indio_dev->info->write_raw)
348 if (indio_dev->info->write_raw_get_fmt)
349 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
350 this_attr->c, this_attr->address)) {
351 case IIO_VAL_INT_PLUS_MICRO:
354 case IIO_VAL_INT_PLUS_NANO:
355 fract_mult = 100000000;
367 if ('0' <= *buf && *buf <= '9') {
369 integer = integer*10 + *buf - '0';
371 fract += fract_mult*(*buf - '0');
376 } else if (*buf == '\n') {
377 if (*(buf + 1) == '\0')
381 } else if (*buf == '.') {
382 integer_part = false;
395 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
396 integer, fract, this_attr->address);
404 int __iio_device_attr_init(struct device_attribute *dev_attr,
406 struct iio_chan_spec const *chan,
407 ssize_t (*readfunc)(struct device *dev,
408 struct device_attribute *attr,
410 ssize_t (*writefunc)(struct device *dev,
411 struct device_attribute *attr,
417 char *name_format, *full_postfix;
418 sysfs_attr_init(&dev_attr->attr);
420 /* Build up postfix of <extend_name>_<modifier>_postfix */
421 if (chan->modified && !generic) {
422 if (chan->extend_name)
423 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
424 iio_modifier_names[chan
429 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
430 iio_modifier_names[chan
434 if (chan->extend_name == NULL)
435 full_postfix = kstrdup(postfix, GFP_KERNEL);
437 full_postfix = kasprintf(GFP_KERNEL,
442 if (full_postfix == NULL) {
447 if (chan->differential) { /* Differential can not have modifier */
450 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
451 iio_direction[chan->output],
452 iio_chan_type_name_spec[chan->type],
453 iio_chan_type_name_spec[chan->type],
455 else if (chan->indexed)
457 = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
458 iio_direction[chan->output],
459 iio_chan_type_name_spec[chan->type],
461 iio_chan_type_name_spec[chan->type],
465 WARN_ON("Differential channels must be indexed\n");
467 goto error_free_full_postfix;
469 } else { /* Single ended */
472 = kasprintf(GFP_KERNEL, "%s_%s_%s",
473 iio_direction[chan->output],
474 iio_chan_type_name_spec[chan->type],
476 else if (chan->indexed)
478 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
479 iio_direction[chan->output],
480 iio_chan_type_name_spec[chan->type],
485 = kasprintf(GFP_KERNEL, "%s_%s_%s",
486 iio_direction[chan->output],
487 iio_chan_type_name_spec[chan->type],
490 if (name_format == NULL) {
492 goto error_free_full_postfix;
494 dev_attr->attr.name = kasprintf(GFP_KERNEL,
498 if (dev_attr->attr.name == NULL) {
500 goto error_free_name_format;
504 dev_attr->attr.mode |= S_IRUGO;
505 dev_attr->show = readfunc;
509 dev_attr->attr.mode |= S_IWUSR;
510 dev_attr->store = writefunc;
517 error_free_name_format:
519 error_free_full_postfix:
525 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
527 kfree(dev_attr->attr.name);
530 int __iio_add_chan_devattr(const char *postfix,
531 struct iio_chan_spec const *chan,
532 ssize_t (*readfunc)(struct device *dev,
533 struct device_attribute *attr,
535 ssize_t (*writefunc)(struct device *dev,
536 struct device_attribute *attr,
542 struct list_head *attr_list)
545 struct iio_dev_attr *iio_attr, *t;
547 iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
548 if (iio_attr == NULL) {
552 ret = __iio_device_attr_init(&iio_attr->dev_attr,
554 readfunc, writefunc, generic);
556 goto error_iio_dev_attr_free;
558 iio_attr->address = mask;
559 list_for_each_entry(t, attr_list, l)
560 if (strcmp(t->dev_attr.attr.name,
561 iio_attr->dev_attr.attr.name) == 0) {
563 dev_err(dev, "tried to double register : %s\n",
564 t->dev_attr.attr.name);
566 goto error_device_attr_deinit;
568 list_add(&iio_attr->l, attr_list);
572 error_device_attr_deinit:
573 __iio_device_attr_deinit(&iio_attr->dev_attr);
574 error_iio_dev_attr_free:
580 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
581 struct iio_chan_spec const *chan)
583 int ret, i, attrcount = 0;
585 if (chan->channel < 0)
588 ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val],
590 &iio_read_channel_info,
592 &iio_write_channel_info : NULL),
596 &indio_dev->channel_attr_list);
601 for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
602 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
604 &iio_read_channel_info,
605 &iio_write_channel_info,
609 &indio_dev->channel_attr_list);
610 if (ret == -EBUSY && (i%2 == 0)) {
623 static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
624 struct iio_dev_attr *p)
626 kfree(p->dev_attr.attr.name);
630 static ssize_t iio_show_dev_name(struct device *dev,
631 struct device_attribute *attr,
634 struct iio_dev *indio_dev = dev_get_drvdata(dev);
635 return sprintf(buf, "%s\n", indio_dev->name);
638 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
640 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
642 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
643 struct iio_dev_attr *p, *n;
644 struct attribute **attr;
646 /* First count elements in any existing group */
647 if (indio_dev->info->attrs) {
648 attr = indio_dev->info->attrs->attrs;
649 while (*attr++ != NULL)
652 attrcount = attrcount_orig;
654 * New channel registration method - relies on the fact a group does
655 * not need to be initialized if it is name is NULL.
657 INIT_LIST_HEAD(&indio_dev->channel_attr_list);
658 if (indio_dev->channels)
659 for (i = 0; i < indio_dev->num_channels; i++) {
660 ret = iio_device_add_channel_sysfs(indio_dev,
664 goto error_clear_attrs;
671 indio_dev->chan_attr_group.attrs
672 = kzalloc(sizeof(indio_dev->chan_attr_group.attrs[0])*
675 if (indio_dev->chan_attr_group.attrs == NULL) {
677 goto error_clear_attrs;
679 /* Copy across original attributes */
680 if (indio_dev->info->attrs)
681 memcpy(indio_dev->chan_attr_group.attrs,
682 indio_dev->info->attrs->attrs,
683 sizeof(indio_dev->chan_attr_group.attrs[0])
685 attrn = attrcount_orig;
686 /* Add all elements from the list. */
687 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
688 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
690 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
692 indio_dev->groups[indio_dev->groupcounter++] =
693 &indio_dev->chan_attr_group;
698 list_for_each_entry_safe(p, n,
699 &indio_dev->channel_attr_list, l) {
701 iio_device_remove_and_free_read_attr(indio_dev, p);
707 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
710 struct iio_dev_attr *p, *n;
712 list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
714 iio_device_remove_and_free_read_attr(indio_dev, p);
716 kfree(indio_dev->chan_attr_group.attrs);
719 static const char * const iio_ev_type_text[] = {
720 [IIO_EV_TYPE_THRESH] = "thresh",
721 [IIO_EV_TYPE_MAG] = "mag",
722 [IIO_EV_TYPE_ROC] = "roc",
723 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
724 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
727 static const char * const iio_ev_dir_text[] = {
728 [IIO_EV_DIR_EITHER] = "either",
729 [IIO_EV_DIR_RISING] = "rising",
730 [IIO_EV_DIR_FALLING] = "falling"
733 static ssize_t iio_ev_state_store(struct device *dev,
734 struct device_attribute *attr,
738 struct iio_dev *indio_dev = dev_get_drvdata(dev);
739 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
743 ret = strtobool(buf, &val);
747 ret = indio_dev->info->write_event_config(indio_dev,
750 return (ret < 0) ? ret : len;
753 static ssize_t iio_ev_state_show(struct device *dev,
754 struct device_attribute *attr,
757 struct iio_dev *indio_dev = dev_get_drvdata(dev);
758 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
759 int val = indio_dev->info->read_event_config(indio_dev,
765 return sprintf(buf, "%d\n", val);
768 static ssize_t iio_ev_value_show(struct device *dev,
769 struct device_attribute *attr,
772 struct iio_dev *indio_dev = dev_get_drvdata(dev);
773 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
776 ret = indio_dev->info->read_event_value(indio_dev,
777 this_attr->address, &val);
781 return sprintf(buf, "%d\n", val);
784 static ssize_t iio_ev_value_store(struct device *dev,
785 struct device_attribute *attr,
789 struct iio_dev *indio_dev = dev_get_drvdata(dev);
790 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
794 ret = strict_strtoul(buf, 10, &val);
798 ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
806 static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
807 struct iio_chan_spec const *chan)
809 int ret = 0, i, attrcount = 0;
812 if (!chan->event_mask)
815 for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
816 postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
817 iio_ev_type_text[i/IIO_EV_DIR_MAX],
818 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
819 if (postfix == NULL) {
824 mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
827 else if (chan->differential)
828 mask = IIO_EVENT_CODE(chan->type,
836 mask = IIO_UNMOD_EVENT_CODE(chan->type,
841 ret = __iio_add_chan_devattr(postfix,
848 &indio_dev->event_interface->
854 postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
855 iio_ev_type_text[i/IIO_EV_DIR_MAX],
856 iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
857 if (postfix == NULL) {
861 ret = __iio_add_chan_devattr(postfix, chan,
867 &indio_dev->event_interface->
879 static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
881 struct iio_dev_attr *p, *n;
882 list_for_each_entry_safe(p, n,
883 &indio_dev->event_interface->
885 kfree(p->dev_attr.attr.name);
890 static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
892 int j, ret, attrcount = 0;
894 INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
895 /* Dynically created from the channels array */
896 for (j = 0; j < indio_dev->num_channels; j++) {
897 ret = iio_device_add_event_sysfs(indio_dev,
898 &indio_dev->channels[j]);
900 goto error_clear_attrs;
906 __iio_remove_event_config_attrs(indio_dev);
911 static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
915 for (j = 0; j < indio_dev->num_channels; j++)
916 if (indio_dev->channels[j].event_mask != 0)
921 static void iio_setup_ev_int(struct iio_event_interface *ev_int)
923 mutex_init(&ev_int->event_list_lock);
924 /* discussion point - make this variable? */
925 ev_int->max_events = 10;
926 ev_int->current_events = 0;
927 INIT_LIST_HEAD(&ev_int->det_events);
928 init_waitqueue_head(&ev_int->wait);
931 static const char *iio_event_group_name = "events";
932 static int iio_device_register_eventset(struct iio_dev *indio_dev)
934 struct iio_dev_attr *p;
935 int ret = 0, attrcount_orig = 0, attrcount, attrn;
936 struct attribute **attr;
938 if (!(indio_dev->info->event_attrs ||
939 iio_check_for_dynamic_events(indio_dev)))
942 indio_dev->event_interface =
943 kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
944 if (indio_dev->event_interface == NULL) {
949 iio_setup_ev_int(indio_dev->event_interface);
950 if (indio_dev->info->event_attrs != NULL) {
951 attr = indio_dev->info->event_attrs->attrs;
952 while (*attr++ != NULL)
955 attrcount = attrcount_orig;
956 if (indio_dev->channels) {
957 ret = __iio_add_event_config_attrs(indio_dev);
959 goto error_free_setup_event_lines;
963 indio_dev->event_interface->group.name = iio_event_group_name;
964 indio_dev->event_interface->group.attrs =
965 kzalloc(sizeof(indio_dev->event_interface->group.attrs[0])
968 if (indio_dev->event_interface->group.attrs == NULL) {
970 goto error_free_setup_event_lines;
972 if (indio_dev->info->event_attrs)
973 memcpy(indio_dev->event_interface->group.attrs,
974 indio_dev->info->event_attrs->attrs,
975 sizeof(indio_dev->event_interface->group.attrs[0])
977 attrn = attrcount_orig;
978 /* Add all elements from the list. */
979 list_for_each_entry(p,
980 &indio_dev->event_interface->dev_attr_list,
982 indio_dev->event_interface->group.attrs[attrn++] =
984 indio_dev->groups[indio_dev->groupcounter++] =
985 &indio_dev->event_interface->group;
989 error_free_setup_event_lines:
990 __iio_remove_event_config_attrs(indio_dev);
991 kfree(indio_dev->event_interface);
997 static void iio_device_unregister_eventset(struct iio_dev *indio_dev)
999 if (indio_dev->event_interface == NULL)
1001 __iio_remove_event_config_attrs(indio_dev);
1002 kfree(indio_dev->event_interface->group.attrs);
1003 kfree(indio_dev->event_interface);
1006 static void iio_dev_release(struct device *device)
1008 struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
1009 cdev_del(&indio_dev->chrdev);
1010 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1011 iio_device_unregister_trigger_consumer(indio_dev);
1012 iio_device_unregister_eventset(indio_dev);
1013 iio_device_unregister_sysfs(indio_dev);
1016 static struct device_type iio_dev_type = {
1017 .name = "iio_device",
1018 .release = iio_dev_release,
1021 struct iio_dev *iio_allocate_device(int sizeof_priv)
1023 struct iio_dev *dev;
1026 alloc_size = sizeof(struct iio_dev);
1028 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1029 alloc_size += sizeof_priv;
1031 /* ensure 32-byte alignment of whole construct ? */
1032 alloc_size += IIO_ALIGN - 1;
1034 dev = kzalloc(alloc_size, GFP_KERNEL);
1037 dev->dev.groups = dev->groups;
1038 dev->dev.type = &iio_dev_type;
1039 dev->dev.bus = &iio_bus_type;
1040 device_initialize(&dev->dev);
1041 dev_set_drvdata(&dev->dev, (void *)dev);
1042 mutex_init(&dev->mlock);
1044 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1046 /* cannot use a dev_err as the name isn't available */
1047 printk(KERN_ERR "Failed to get id\n");
1051 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1056 EXPORT_SYMBOL(iio_allocate_device);
1058 void iio_free_device(struct iio_dev *dev)
1061 ida_simple_remove(&iio_ida, dev->id);
1065 EXPORT_SYMBOL(iio_free_device);
1068 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1070 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1072 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1073 struct iio_dev, chrdev);
1074 filp->private_data = indio_dev;
1076 return iio_chrdev_buffer_open(indio_dev);
1080 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1082 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1084 iio_chrdev_buffer_release(container_of(inode->i_cdev,
1085 struct iio_dev, chrdev));
1089 /* Somewhat of a cross file organization violation - ioctls here are actually
1091 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1093 struct iio_dev *indio_dev = filp->private_data;
1094 int __user *ip = (int __user *)arg;
1097 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1098 fd = iio_event_getfd(indio_dev);
1099 if (copy_to_user(ip, &fd, sizeof(fd)))
1106 static const struct file_operations iio_buffer_fileops = {
1107 .read = iio_buffer_read_first_n_outer_addr,
1108 .release = iio_chrdev_release,
1109 .open = iio_chrdev_open,
1110 .poll = iio_buffer_poll_addr,
1111 .owner = THIS_MODULE,
1112 .llseek = noop_llseek,
1113 .unlocked_ioctl = iio_ioctl,
1114 .compat_ioctl = iio_ioctl,
1117 int iio_device_register(struct iio_dev *indio_dev)
1121 /* configure elements for the chrdev */
1122 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1124 ret = iio_device_register_sysfs(indio_dev);
1126 dev_err(indio_dev->dev.parent,
1127 "Failed to register sysfs interfaces\n");
1130 ret = iio_device_register_eventset(indio_dev);
1132 dev_err(indio_dev->dev.parent,
1133 "Failed to register event set\n");
1134 goto error_free_sysfs;
1136 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
1137 iio_device_register_trigger_consumer(indio_dev);
1139 ret = device_add(&indio_dev->dev);
1141 goto error_unreg_eventset;
1142 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1143 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1144 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1146 goto error_del_device;
1150 device_del(&indio_dev->dev);
1151 error_unreg_eventset:
1152 iio_device_unregister_eventset(indio_dev);
1154 iio_device_unregister_sysfs(indio_dev);
1158 EXPORT_SYMBOL(iio_device_register);
1160 void iio_device_unregister(struct iio_dev *indio_dev)
1162 device_unregister(&indio_dev->dev);
1164 EXPORT_SYMBOL(iio_device_unregister);
1165 subsys_initcall(iio_init);
1166 module_exit(iio_exit);
1168 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
1169 MODULE_DESCRIPTION("Industrial I/O core");
1170 MODULE_LICENSE("GPL");