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>
25 #include <linux/debugfs.h>
26 #include <linux/iio/iio.h>
28 #include "iio_core_trigger.h"
29 #include <linux/iio/sysfs.h>
30 #include <linux/iio/events.h>
32 /* IDA to assign each registered device a unique id */
33 static DEFINE_IDA(iio_ida);
35 static dev_t iio_devt;
37 #define IIO_DEV_MAX 256
38 struct bus_type iio_bus_type = {
41 EXPORT_SYMBOL(iio_bus_type);
43 static struct dentry *iio_debugfs_dentry;
45 static const char * const iio_direction[] = {
50 static const char * const iio_chan_type_name_spec[] = {
51 [IIO_VOLTAGE] = "voltage",
52 [IIO_CURRENT] = "current",
53 [IIO_POWER] = "power",
54 [IIO_ACCEL] = "accel",
55 [IIO_ANGL_VEL] = "anglvel",
57 [IIO_LIGHT] = "illuminance",
58 [IIO_INTENSITY] = "intensity",
59 [IIO_PROXIMITY] = "proximity",
61 [IIO_INCLI] = "incli",
64 [IIO_TIMESTAMP] = "timestamp",
65 [IIO_CAPACITANCE] = "capacitance",
66 [IIO_ALTVOLTAGE] = "altvoltage",
70 static const char * const iio_modifier_names[] = {
74 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
75 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
76 [IIO_MOD_LIGHT_BOTH] = "both",
77 [IIO_MOD_LIGHT_IR] = "ir",
78 [IIO_MOD_LIGHT_CLEAR] = "clear",
79 [IIO_MOD_LIGHT_RED] = "red",
80 [IIO_MOD_LIGHT_GREEN] = "green",
81 [IIO_MOD_LIGHT_BLUE] = "blue",
84 /* relies on pairs of these shared then separate */
85 static const char * const iio_chan_info_postfix[] = {
86 [IIO_CHAN_INFO_RAW] = "raw",
87 [IIO_CHAN_INFO_PROCESSED] = "input",
88 [IIO_CHAN_INFO_SCALE] = "scale",
89 [IIO_CHAN_INFO_OFFSET] = "offset",
90 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
91 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
92 [IIO_CHAN_INFO_PEAK] = "peak_raw",
93 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
94 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
95 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
96 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
97 = "filter_low_pass_3db_frequency",
98 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
99 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
100 [IIO_CHAN_INFO_PHASE] = "phase",
101 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
102 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
105 const struct iio_chan_spec
106 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
110 for (i = 0; i < indio_dev->num_channels; i++)
111 if (indio_dev->channels[i].scan_index == si)
112 return &indio_dev->channels[i];
116 /* This turns up an awful lot */
117 ssize_t iio_read_const_attr(struct device *dev,
118 struct device_attribute *attr,
121 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
123 EXPORT_SYMBOL(iio_read_const_attr);
125 static int __init iio_init(void)
129 /* Register sysfs bus */
130 ret = bus_register(&iio_bus_type);
133 "%s could not register bus type\n",
138 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
140 printk(KERN_ERR "%s: failed to allocate char dev region\n",
142 goto error_unregister_bus_type;
145 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
149 error_unregister_bus_type:
150 bus_unregister(&iio_bus_type);
155 static void __exit iio_exit(void)
158 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
159 bus_unregister(&iio_bus_type);
160 debugfs_remove(iio_debugfs_dentry);
163 #if defined(CONFIG_DEBUG_FS)
164 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
165 size_t count, loff_t *ppos)
167 struct iio_dev *indio_dev = file->private_data;
173 ret = indio_dev->info->debugfs_reg_access(indio_dev,
174 indio_dev->cached_reg_addr,
177 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
179 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
181 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
184 static ssize_t iio_debugfs_write_reg(struct file *file,
185 const char __user *userbuf, size_t count, loff_t *ppos)
187 struct iio_dev *indio_dev = file->private_data;
192 count = min_t(size_t, count, (sizeof(buf)-1));
193 if (copy_from_user(buf, userbuf, count))
198 ret = sscanf(buf, "%i %i", ®, &val);
202 indio_dev->cached_reg_addr = reg;
205 indio_dev->cached_reg_addr = reg;
206 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
209 dev_err(indio_dev->dev.parent, "%s: write failed\n",
221 static const struct file_operations iio_debugfs_reg_fops = {
223 .read = iio_debugfs_read_reg,
224 .write = iio_debugfs_write_reg,
227 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
229 debugfs_remove_recursive(indio_dev->debugfs_dentry);
232 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
236 if (indio_dev->info->debugfs_reg_access == NULL)
239 if (!iio_debugfs_dentry)
242 indio_dev->debugfs_dentry =
243 debugfs_create_dir(dev_name(&indio_dev->dev),
245 if (indio_dev->debugfs_dentry == NULL) {
246 dev_warn(indio_dev->dev.parent,
247 "Failed to create debugfs directory\n");
251 d = debugfs_create_file("direct_reg_access", 0644,
252 indio_dev->debugfs_dentry,
253 indio_dev, &iio_debugfs_reg_fops);
255 iio_device_unregister_debugfs(indio_dev);
262 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
267 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
270 #endif /* CONFIG_DEBUG_FS */
272 static ssize_t iio_read_channel_ext_info(struct device *dev,
273 struct device_attribute *attr,
276 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
277 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
278 const struct iio_chan_spec_ext_info *ext_info;
280 ext_info = &this_attr->c->ext_info[this_attr->address];
282 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
285 static ssize_t iio_write_channel_ext_info(struct device *dev,
286 struct device_attribute *attr,
290 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
291 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
292 const struct iio_chan_spec_ext_info *ext_info;
294 ext_info = &this_attr->c->ext_info[this_attr->address];
296 return ext_info->write(indio_dev, ext_info->private,
297 this_attr->c, buf, len);
300 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
301 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
303 const struct iio_enum *e = (const struct iio_enum *)priv;
310 for (i = 0; i < e->num_items; ++i)
311 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
313 /* replace last space with a newline */
318 EXPORT_SYMBOL_GPL(iio_enum_available_read);
320 ssize_t iio_enum_read(struct iio_dev *indio_dev,
321 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
323 const struct iio_enum *e = (const struct iio_enum *)priv;
329 i = e->get(indio_dev, chan);
332 else if (i >= e->num_items)
335 return sprintf(buf, "%s\n", e->items[i]);
337 EXPORT_SYMBOL_GPL(iio_enum_read);
339 ssize_t iio_enum_write(struct iio_dev *indio_dev,
340 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
343 const struct iio_enum *e = (const struct iio_enum *)priv;
350 for (i = 0; i < e->num_items; i++) {
351 if (sysfs_streq(buf, e->items[i]))
355 if (i == e->num_items)
358 ret = e->set(indio_dev, chan, i);
359 return ret ? ret : len;
361 EXPORT_SYMBOL_GPL(iio_enum_write);
363 static ssize_t iio_read_channel_info(struct device *dev,
364 struct device_attribute *attr,
367 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
368 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
369 unsigned long long tmp;
371 bool scale_db = false;
372 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
373 &val, &val2, this_attr->address);
380 return sprintf(buf, "%d\n", val);
381 case IIO_VAL_INT_PLUS_MICRO_DB:
383 case IIO_VAL_INT_PLUS_MICRO:
385 return sprintf(buf, "-%d.%06u%s\n", val, -val2,
386 scale_db ? " dB" : "");
388 return sprintf(buf, "%d.%06u%s\n", val, val2,
389 scale_db ? " dB" : "");
390 case IIO_VAL_INT_PLUS_NANO:
392 return sprintf(buf, "-%d.%09u\n", val, -val2);
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);
399 return sprintf(buf, "%d.%09u\n", val, val2);
405 static ssize_t iio_write_channel_info(struct device *dev,
406 struct device_attribute *attr,
410 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
411 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
412 int ret, integer = 0, fract = 0, fract_mult = 100000;
413 bool integer_part = true, negative = false;
415 /* Assumes decimal - precision based on number of digits */
416 if (!indio_dev->info->write_raw)
419 if (indio_dev->info->write_raw_get_fmt)
420 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
421 this_attr->c, this_attr->address)) {
422 case IIO_VAL_INT_PLUS_MICRO:
425 case IIO_VAL_INT_PLUS_NANO:
426 fract_mult = 100000000;
438 if ('0' <= *buf && *buf <= '9') {
440 integer = integer*10 + *buf - '0';
442 fract += fract_mult*(*buf - '0');
447 } else if (*buf == '\n') {
448 if (*(buf + 1) == '\0')
452 } else if (*buf == '.') {
453 integer_part = false;
466 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
467 integer, fract, this_attr->address);
475 int __iio_device_attr_init(struct device_attribute *dev_attr,
477 struct iio_chan_spec const *chan,
478 ssize_t (*readfunc)(struct device *dev,
479 struct device_attribute *attr,
481 ssize_t (*writefunc)(struct device *dev,
482 struct device_attribute *attr,
488 char *name_format, *full_postfix;
489 sysfs_attr_init(&dev_attr->attr);
491 /* Build up postfix of <extend_name>_<modifier>_postfix */
492 if (chan->modified && !generic) {
493 if (chan->extend_name)
494 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
495 iio_modifier_names[chan
500 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
501 iio_modifier_names[chan
505 if (chan->extend_name == NULL)
506 full_postfix = kstrdup(postfix, GFP_KERNEL);
508 full_postfix = kasprintf(GFP_KERNEL,
513 if (full_postfix == NULL) {
518 if (chan->differential) { /* Differential can not have modifier */
521 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
522 iio_direction[chan->output],
523 iio_chan_type_name_spec[chan->type],
524 iio_chan_type_name_spec[chan->type],
526 else if (chan->indexed)
528 = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
529 iio_direction[chan->output],
530 iio_chan_type_name_spec[chan->type],
532 iio_chan_type_name_spec[chan->type],
536 WARN_ON("Differential channels must be indexed\n");
538 goto error_free_full_postfix;
540 } else { /* Single ended */
543 = kasprintf(GFP_KERNEL, "%s_%s_%s",
544 iio_direction[chan->output],
545 iio_chan_type_name_spec[chan->type],
547 else if (chan->indexed)
549 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
550 iio_direction[chan->output],
551 iio_chan_type_name_spec[chan->type],
556 = kasprintf(GFP_KERNEL, "%s_%s_%s",
557 iio_direction[chan->output],
558 iio_chan_type_name_spec[chan->type],
561 if (name_format == NULL) {
563 goto error_free_full_postfix;
565 dev_attr->attr.name = kasprintf(GFP_KERNEL,
569 if (dev_attr->attr.name == NULL) {
571 goto error_free_name_format;
575 dev_attr->attr.mode |= S_IRUGO;
576 dev_attr->show = readfunc;
580 dev_attr->attr.mode |= S_IWUSR;
581 dev_attr->store = writefunc;
588 error_free_name_format:
590 error_free_full_postfix:
596 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
598 kfree(dev_attr->attr.name);
601 int __iio_add_chan_devattr(const char *postfix,
602 struct iio_chan_spec const *chan,
603 ssize_t (*readfunc)(struct device *dev,
604 struct device_attribute *attr,
606 ssize_t (*writefunc)(struct device *dev,
607 struct device_attribute *attr,
613 struct list_head *attr_list)
616 struct iio_dev_attr *iio_attr, *t;
618 iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
619 if (iio_attr == NULL) {
623 ret = __iio_device_attr_init(&iio_attr->dev_attr,
625 readfunc, writefunc, generic);
627 goto error_iio_dev_attr_free;
629 iio_attr->address = mask;
630 list_for_each_entry(t, attr_list, l)
631 if (strcmp(t->dev_attr.attr.name,
632 iio_attr->dev_attr.attr.name) == 0) {
634 dev_err(dev, "tried to double register : %s\n",
635 t->dev_attr.attr.name);
637 goto error_device_attr_deinit;
639 list_add(&iio_attr->l, attr_list);
643 error_device_attr_deinit:
644 __iio_device_attr_deinit(&iio_attr->dev_attr);
645 error_iio_dev_attr_free:
651 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
652 struct iio_chan_spec const *chan)
654 int ret, attrcount = 0;
656 const struct iio_chan_spec_ext_info *ext_info;
658 if (chan->channel < 0)
660 for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
661 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
663 &iio_read_channel_info,
664 &iio_write_channel_info,
668 &indio_dev->channel_attr_list);
669 if (ret == -EBUSY && (i%2 == 0)) {
678 if (chan->ext_info) {
680 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
681 ret = __iio_add_chan_devattr(ext_info->name,
684 &iio_read_channel_ext_info : NULL,
686 &iio_write_channel_ext_info : NULL,
690 &indio_dev->channel_attr_list);
692 if (ret == -EBUSY && ext_info->shared)
707 static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
708 struct iio_dev_attr *p)
710 kfree(p->dev_attr.attr.name);
714 static ssize_t iio_show_dev_name(struct device *dev,
715 struct device_attribute *attr,
718 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
719 return sprintf(buf, "%s\n", indio_dev->name);
722 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
724 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
726 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
727 struct iio_dev_attr *p, *n;
728 struct attribute **attr;
730 /* First count elements in any existing group */
731 if (indio_dev->info->attrs) {
732 attr = indio_dev->info->attrs->attrs;
733 while (*attr++ != NULL)
736 attrcount = attrcount_orig;
738 * New channel registration method - relies on the fact a group does
739 * not need to be initialized if its name is NULL.
741 if (indio_dev->channels)
742 for (i = 0; i < indio_dev->num_channels; i++) {
743 ret = iio_device_add_channel_sysfs(indio_dev,
747 goto error_clear_attrs;
754 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
755 sizeof(indio_dev->chan_attr_group.attrs[0]),
757 if (indio_dev->chan_attr_group.attrs == NULL) {
759 goto error_clear_attrs;
761 /* Copy across original attributes */
762 if (indio_dev->info->attrs)
763 memcpy(indio_dev->chan_attr_group.attrs,
764 indio_dev->info->attrs->attrs,
765 sizeof(indio_dev->chan_attr_group.attrs[0])
767 attrn = attrcount_orig;
768 /* Add all elements from the list. */
769 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
770 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
772 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
774 indio_dev->groups[indio_dev->groupcounter++] =
775 &indio_dev->chan_attr_group;
780 list_for_each_entry_safe(p, n,
781 &indio_dev->channel_attr_list, l) {
783 iio_device_remove_and_free_read_attr(indio_dev, p);
789 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
792 struct iio_dev_attr *p, *n;
794 list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
796 iio_device_remove_and_free_read_attr(indio_dev, p);
798 kfree(indio_dev->chan_attr_group.attrs);
801 static void iio_dev_release(struct device *device)
803 struct iio_dev *indio_dev = dev_to_iio_dev(device);
804 if (indio_dev->chrdev.dev)
805 cdev_del(&indio_dev->chrdev);
806 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
807 iio_device_unregister_trigger_consumer(indio_dev);
808 iio_device_unregister_eventset(indio_dev);
809 iio_device_unregister_sysfs(indio_dev);
810 iio_device_unregister_debugfs(indio_dev);
812 ida_simple_remove(&iio_ida, indio_dev->id);
816 static struct device_type iio_dev_type = {
817 .name = "iio_device",
818 .release = iio_dev_release,
821 struct iio_dev *iio_device_alloc(int sizeof_priv)
826 alloc_size = sizeof(struct iio_dev);
828 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
829 alloc_size += sizeof_priv;
831 /* ensure 32-byte alignment of whole construct ? */
832 alloc_size += IIO_ALIGN - 1;
834 dev = kzalloc(alloc_size, GFP_KERNEL);
837 dev->dev.groups = dev->groups;
838 dev->dev.type = &iio_dev_type;
839 dev->dev.bus = &iio_bus_type;
840 device_initialize(&dev->dev);
841 dev_set_drvdata(&dev->dev, (void *)dev);
842 mutex_init(&dev->mlock);
843 mutex_init(&dev->info_exist_lock);
844 INIT_LIST_HEAD(&dev->channel_attr_list);
846 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
848 /* cannot use a dev_err as the name isn't available */
849 printk(KERN_ERR "Failed to get id\n");
853 dev_set_name(&dev->dev, "iio:device%d", dev->id);
858 EXPORT_SYMBOL(iio_device_alloc);
860 void iio_device_free(struct iio_dev *dev)
863 put_device(&dev->dev);
865 EXPORT_SYMBOL(iio_device_free);
868 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
870 static int iio_chrdev_open(struct inode *inode, struct file *filp)
872 struct iio_dev *indio_dev = container_of(inode->i_cdev,
873 struct iio_dev, chrdev);
875 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
878 filp->private_data = indio_dev;
884 * iio_chrdev_release() - chrdev file close buffer access and ioctls
886 static int iio_chrdev_release(struct inode *inode, struct file *filp)
888 struct iio_dev *indio_dev = container_of(inode->i_cdev,
889 struct iio_dev, chrdev);
890 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
894 /* Somewhat of a cross file organization violation - ioctls here are actually
896 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
898 struct iio_dev *indio_dev = filp->private_data;
899 int __user *ip = (int __user *)arg;
902 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
903 fd = iio_event_getfd(indio_dev);
904 if (copy_to_user(ip, &fd, sizeof(fd)))
911 static const struct file_operations iio_buffer_fileops = {
912 .read = iio_buffer_read_first_n_outer_addr,
913 .release = iio_chrdev_release,
914 .open = iio_chrdev_open,
915 .poll = iio_buffer_poll_addr,
916 .owner = THIS_MODULE,
917 .llseek = noop_llseek,
918 .unlocked_ioctl = iio_ioctl,
919 .compat_ioctl = iio_ioctl,
922 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
924 int iio_device_register(struct iio_dev *indio_dev)
928 /* configure elements for the chrdev */
929 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
931 ret = iio_device_register_debugfs(indio_dev);
933 dev_err(indio_dev->dev.parent,
934 "Failed to register debugfs interfaces\n");
937 ret = iio_device_register_sysfs(indio_dev);
939 dev_err(indio_dev->dev.parent,
940 "Failed to register sysfs interfaces\n");
941 goto error_unreg_debugfs;
943 ret = iio_device_register_eventset(indio_dev);
945 dev_err(indio_dev->dev.parent,
946 "Failed to register event set\n");
947 goto error_free_sysfs;
949 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
950 iio_device_register_trigger_consumer(indio_dev);
952 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
953 indio_dev->setup_ops == NULL)
954 indio_dev->setup_ops = &noop_ring_setup_ops;
956 ret = device_add(&indio_dev->dev);
958 goto error_unreg_eventset;
959 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
960 indio_dev->chrdev.owner = indio_dev->info->driver_module;
961 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
963 goto error_del_device;
967 device_del(&indio_dev->dev);
968 error_unreg_eventset:
969 iio_device_unregister_eventset(indio_dev);
971 iio_device_unregister_sysfs(indio_dev);
973 iio_device_unregister_debugfs(indio_dev);
977 EXPORT_SYMBOL(iio_device_register);
979 void iio_device_unregister(struct iio_dev *indio_dev)
981 mutex_lock(&indio_dev->info_exist_lock);
982 indio_dev->info = NULL;
983 mutex_unlock(&indio_dev->info_exist_lock);
984 device_del(&indio_dev->dev);
986 EXPORT_SYMBOL(iio_device_unregister);
987 subsys_initcall(iio_init);
988 module_exit(iio_exit);
990 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
991 MODULE_DESCRIPTION("Industrial I/O core");
992 MODULE_LICENSE("GPL");