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",
68 static const char * const iio_modifier_names
[] = {
72 [IIO_MOD_LIGHT_BOTH
] = "both",
73 [IIO_MOD_LIGHT_IR
] = "ir",
76 /* relies on pairs of these shared then separate */
77 static const char * const iio_chan_info_postfix
[] = {
78 [IIO_CHAN_INFO_RAW
] = "raw",
79 [IIO_CHAN_INFO_PROCESSED
] = "input",
80 [IIO_CHAN_INFO_SCALE
] = "scale",
81 [IIO_CHAN_INFO_OFFSET
] = "offset",
82 [IIO_CHAN_INFO_CALIBSCALE
] = "calibscale",
83 [IIO_CHAN_INFO_CALIBBIAS
] = "calibbias",
84 [IIO_CHAN_INFO_PEAK
] = "peak_raw",
85 [IIO_CHAN_INFO_PEAK_SCALE
] = "peak_scale",
86 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW
] = "quadrature_correction_raw",
87 [IIO_CHAN_INFO_AVERAGE_RAW
] = "mean_raw",
88 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY
]
89 = "filter_low_pass_3db_frequency",
90 [IIO_CHAN_INFO_SAMP_FREQ
] = "sampling_frequency",
93 const struct iio_chan_spec
94 *iio_find_channel_from_si(struct iio_dev
*indio_dev
, int si
)
98 for (i
= 0; i
< indio_dev
->num_channels
; i
++)
99 if (indio_dev
->channels
[i
].scan_index
== si
)
100 return &indio_dev
->channels
[i
];
104 /* This turns up an awful lot */
105 ssize_t
iio_read_const_attr(struct device
*dev
,
106 struct device_attribute
*attr
,
109 return sprintf(buf
, "%s\n", to_iio_const_attr(attr
)->string
);
111 EXPORT_SYMBOL(iio_read_const_attr
);
113 static int __init
iio_init(void)
117 /* Register sysfs bus */
118 ret
= bus_register(&iio_bus_type
);
121 "%s could not register bus type\n",
126 ret
= alloc_chrdev_region(&iio_devt
, 0, IIO_DEV_MAX
, "iio");
128 printk(KERN_ERR
"%s: failed to allocate char dev region\n",
130 goto error_unregister_bus_type
;
133 iio_debugfs_dentry
= debugfs_create_dir("iio", NULL
);
137 error_unregister_bus_type
:
138 bus_unregister(&iio_bus_type
);
143 static void __exit
iio_exit(void)
146 unregister_chrdev_region(iio_devt
, IIO_DEV_MAX
);
147 bus_unregister(&iio_bus_type
);
148 debugfs_remove(iio_debugfs_dentry
);
151 #if defined(CONFIG_DEBUG_FS)
152 static int iio_debugfs_open(struct inode
*inode
, struct file
*file
)
154 if (inode
->i_private
)
155 file
->private_data
= inode
->i_private
;
160 static ssize_t
iio_debugfs_read_reg(struct file
*file
, char __user
*userbuf
,
161 size_t count
, loff_t
*ppos
)
163 struct iio_dev
*indio_dev
= file
->private_data
;
169 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
,
170 indio_dev
->cached_reg_addr
,
173 dev_err(indio_dev
->dev
.parent
, "%s: read failed\n", __func__
);
175 len
= snprintf(buf
, sizeof(buf
), "0x%X\n", val
);
177 return simple_read_from_buffer(userbuf
, count
, ppos
, buf
, len
);
180 static ssize_t
iio_debugfs_write_reg(struct file
*file
,
181 const char __user
*userbuf
, size_t count
, loff_t
*ppos
)
183 struct iio_dev
*indio_dev
= file
->private_data
;
188 count
= min_t(size_t, count
, (sizeof(buf
)-1));
189 if (copy_from_user(buf
, userbuf
, count
))
194 ret
= sscanf(buf
, "%i %i", ®
, &val
);
198 indio_dev
->cached_reg_addr
= reg
;
201 indio_dev
->cached_reg_addr
= reg
;
202 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
, reg
,
205 dev_err(indio_dev
->dev
.parent
, "%s: write failed\n",
217 static const struct file_operations iio_debugfs_reg_fops
= {
218 .open
= iio_debugfs_open
,
219 .read
= iio_debugfs_read_reg
,
220 .write
= iio_debugfs_write_reg
,
223 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
225 debugfs_remove_recursive(indio_dev
->debugfs_dentry
);
228 static int iio_device_register_debugfs(struct iio_dev
*indio_dev
)
232 if (indio_dev
->info
->debugfs_reg_access
== NULL
)
235 if (IS_ERR(iio_debugfs_dentry
))
238 indio_dev
->debugfs_dentry
=
239 debugfs_create_dir(dev_name(&indio_dev
->dev
),
241 if (IS_ERR(indio_dev
->debugfs_dentry
))
242 return PTR_ERR(indio_dev
->debugfs_dentry
);
244 if (indio_dev
->debugfs_dentry
== NULL
) {
245 dev_warn(indio_dev
->dev
.parent
,
246 "Failed to create debugfs directory\n");
250 d
= debugfs_create_file("direct_reg_access", 0644,
251 indio_dev
->debugfs_dentry
,
252 indio_dev
, &iio_debugfs_reg_fops
);
254 iio_device_unregister_debugfs(indio_dev
);
261 static int iio_device_register_debugfs(struct iio_dev
*indio_dev
)
266 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
269 #endif /* CONFIG_DEBUG_FS */
271 static ssize_t
iio_read_channel_ext_info(struct device
*dev
,
272 struct device_attribute
*attr
,
275 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
276 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
277 const struct iio_chan_spec_ext_info
*ext_info
;
279 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
281 return ext_info
->read(indio_dev
, this_attr
->c
, buf
);
284 static ssize_t
iio_write_channel_ext_info(struct device
*dev
,
285 struct device_attribute
*attr
,
289 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
290 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
291 const struct iio_chan_spec_ext_info
*ext_info
;
293 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
295 return ext_info
->write(indio_dev
, this_attr
->c
, buf
, len
);
298 static ssize_t
iio_read_channel_info(struct device
*dev
,
299 struct device_attribute
*attr
,
302 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
303 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
305 int ret
= indio_dev
->info
->read_raw(indio_dev
, this_attr
->c
,
306 &val
, &val2
, this_attr
->address
);
311 if (ret
== IIO_VAL_INT
)
312 return sprintf(buf
, "%d\n", val
);
313 else if (ret
== IIO_VAL_INT_PLUS_MICRO
) {
315 return sprintf(buf
, "-%d.%06u\n", val
, -val2
);
317 return sprintf(buf
, "%d.%06u\n", val
, val2
);
318 } else if (ret
== IIO_VAL_INT_PLUS_NANO
) {
320 return sprintf(buf
, "-%d.%09u\n", val
, -val2
);
322 return sprintf(buf
, "%d.%09u\n", val
, val2
);
327 static ssize_t
iio_write_channel_info(struct device
*dev
,
328 struct device_attribute
*attr
,
332 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
333 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
334 int ret
, integer
= 0, fract
= 0, fract_mult
= 100000;
335 bool integer_part
= true, negative
= false;
337 /* Assumes decimal - precision based on number of digits */
338 if (!indio_dev
->info
->write_raw
)
341 if (indio_dev
->info
->write_raw_get_fmt
)
342 switch (indio_dev
->info
->write_raw_get_fmt(indio_dev
,
343 this_attr
->c
, this_attr
->address
)) {
344 case IIO_VAL_INT_PLUS_MICRO
:
347 case IIO_VAL_INT_PLUS_NANO
:
348 fract_mult
= 100000000;
360 if ('0' <= *buf
&& *buf
<= '9') {
362 integer
= integer
*10 + *buf
- '0';
364 fract
+= fract_mult
*(*buf
- '0');
369 } else if (*buf
== '\n') {
370 if (*(buf
+ 1) == '\0')
374 } else if (*buf
== '.') {
375 integer_part
= false;
388 ret
= indio_dev
->info
->write_raw(indio_dev
, this_attr
->c
,
389 integer
, fract
, this_attr
->address
);
397 int __iio_device_attr_init(struct device_attribute
*dev_attr
,
399 struct iio_chan_spec
const *chan
,
400 ssize_t (*readfunc
)(struct device
*dev
,
401 struct device_attribute
*attr
,
403 ssize_t (*writefunc
)(struct device
*dev
,
404 struct device_attribute
*attr
,
410 char *name_format
, *full_postfix
;
411 sysfs_attr_init(&dev_attr
->attr
);
413 /* Build up postfix of <extend_name>_<modifier>_postfix */
414 if (chan
->modified
&& !generic
) {
415 if (chan
->extend_name
)
416 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s_%s",
417 iio_modifier_names
[chan
422 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s",
423 iio_modifier_names
[chan
427 if (chan
->extend_name
== NULL
)
428 full_postfix
= kstrdup(postfix
, GFP_KERNEL
);
430 full_postfix
= kasprintf(GFP_KERNEL
,
435 if (full_postfix
== NULL
) {
440 if (chan
->differential
) { /* Differential can not have modifier */
443 = kasprintf(GFP_KERNEL
, "%s_%s-%s_%s",
444 iio_direction
[chan
->output
],
445 iio_chan_type_name_spec
[chan
->type
],
446 iio_chan_type_name_spec
[chan
->type
],
448 else if (chan
->indexed
)
450 = kasprintf(GFP_KERNEL
, "%s_%s%d-%s%d_%s",
451 iio_direction
[chan
->output
],
452 iio_chan_type_name_spec
[chan
->type
],
454 iio_chan_type_name_spec
[chan
->type
],
458 WARN_ON("Differential channels must be indexed\n");
460 goto error_free_full_postfix
;
462 } else { /* Single ended */
465 = kasprintf(GFP_KERNEL
, "%s_%s_%s",
466 iio_direction
[chan
->output
],
467 iio_chan_type_name_spec
[chan
->type
],
469 else if (chan
->indexed
)
471 = kasprintf(GFP_KERNEL
, "%s_%s%d_%s",
472 iio_direction
[chan
->output
],
473 iio_chan_type_name_spec
[chan
->type
],
478 = kasprintf(GFP_KERNEL
, "%s_%s_%s",
479 iio_direction
[chan
->output
],
480 iio_chan_type_name_spec
[chan
->type
],
483 if (name_format
== NULL
) {
485 goto error_free_full_postfix
;
487 dev_attr
->attr
.name
= kasprintf(GFP_KERNEL
,
491 if (dev_attr
->attr
.name
== NULL
) {
493 goto error_free_name_format
;
497 dev_attr
->attr
.mode
|= S_IRUGO
;
498 dev_attr
->show
= readfunc
;
502 dev_attr
->attr
.mode
|= S_IWUSR
;
503 dev_attr
->store
= writefunc
;
510 error_free_name_format
:
512 error_free_full_postfix
:
518 static void __iio_device_attr_deinit(struct device_attribute
*dev_attr
)
520 kfree(dev_attr
->attr
.name
);
523 int __iio_add_chan_devattr(const char *postfix
,
524 struct iio_chan_spec
const *chan
,
525 ssize_t (*readfunc
)(struct device
*dev
,
526 struct device_attribute
*attr
,
528 ssize_t (*writefunc
)(struct device
*dev
,
529 struct device_attribute
*attr
,
535 struct list_head
*attr_list
)
538 struct iio_dev_attr
*iio_attr
, *t
;
540 iio_attr
= kzalloc(sizeof *iio_attr
, GFP_KERNEL
);
541 if (iio_attr
== NULL
) {
545 ret
= __iio_device_attr_init(&iio_attr
->dev_attr
,
547 readfunc
, writefunc
, generic
);
549 goto error_iio_dev_attr_free
;
551 iio_attr
->address
= mask
;
552 list_for_each_entry(t
, attr_list
, l
)
553 if (strcmp(t
->dev_attr
.attr
.name
,
554 iio_attr
->dev_attr
.attr
.name
) == 0) {
556 dev_err(dev
, "tried to double register : %s\n",
557 t
->dev_attr
.attr
.name
);
559 goto error_device_attr_deinit
;
561 list_add(&iio_attr
->l
, attr_list
);
565 error_device_attr_deinit
:
566 __iio_device_attr_deinit(&iio_attr
->dev_attr
);
567 error_iio_dev_attr_free
:
573 static int iio_device_add_channel_sysfs(struct iio_dev
*indio_dev
,
574 struct iio_chan_spec
const *chan
)
576 int ret
, attrcount
= 0;
578 const struct iio_chan_spec_ext_info
*ext_info
;
580 if (chan
->channel
< 0)
582 for_each_set_bit(i
, &chan
->info_mask
, sizeof(long)*8) {
583 ret
= __iio_add_chan_devattr(iio_chan_info_postfix
[i
/2],
585 &iio_read_channel_info
,
586 &iio_write_channel_info
,
590 &indio_dev
->channel_attr_list
);
591 if (ret
== -EBUSY
&& (i
%2 == 0)) {
600 if (chan
->ext_info
) {
602 for (ext_info
= chan
->ext_info
; ext_info
->name
; ext_info
++) {
603 ret
= __iio_add_chan_devattr(ext_info
->name
,
606 &iio_read_channel_ext_info
: NULL
,
608 &iio_write_channel_ext_info
: NULL
,
612 &indio_dev
->channel_attr_list
);
614 if (ret
== -EBUSY
&& ext_info
->shared
)
629 static void iio_device_remove_and_free_read_attr(struct iio_dev
*indio_dev
,
630 struct iio_dev_attr
*p
)
632 kfree(p
->dev_attr
.attr
.name
);
636 static ssize_t
iio_show_dev_name(struct device
*dev
,
637 struct device_attribute
*attr
,
640 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
641 return sprintf(buf
, "%s\n", indio_dev
->name
);
644 static DEVICE_ATTR(name
, S_IRUGO
, iio_show_dev_name
, NULL
);
646 static int iio_device_register_sysfs(struct iio_dev
*indio_dev
)
648 int i
, ret
= 0, attrcount
, attrn
, attrcount_orig
= 0;
649 struct iio_dev_attr
*p
, *n
;
650 struct attribute
**attr
;
652 /* First count elements in any existing group */
653 if (indio_dev
->info
->attrs
) {
654 attr
= indio_dev
->info
->attrs
->attrs
;
655 while (*attr
++ != NULL
)
658 attrcount
= attrcount_orig
;
660 * New channel registration method - relies on the fact a group does
661 * not need to be initialized if it is name is NULL.
663 INIT_LIST_HEAD(&indio_dev
->channel_attr_list
);
664 if (indio_dev
->channels
)
665 for (i
= 0; i
< indio_dev
->num_channels
; i
++) {
666 ret
= iio_device_add_channel_sysfs(indio_dev
,
670 goto error_clear_attrs
;
677 indio_dev
->chan_attr_group
.attrs
= kcalloc(attrcount
+ 1,
678 sizeof(indio_dev
->chan_attr_group
.attrs
[0]),
680 if (indio_dev
->chan_attr_group
.attrs
== NULL
) {
682 goto error_clear_attrs
;
684 /* Copy across original attributes */
685 if (indio_dev
->info
->attrs
)
686 memcpy(indio_dev
->chan_attr_group
.attrs
,
687 indio_dev
->info
->attrs
->attrs
,
688 sizeof(indio_dev
->chan_attr_group
.attrs
[0])
690 attrn
= attrcount_orig
;
691 /* Add all elements from the list. */
692 list_for_each_entry(p
, &indio_dev
->channel_attr_list
, l
)
693 indio_dev
->chan_attr_group
.attrs
[attrn
++] = &p
->dev_attr
.attr
;
695 indio_dev
->chan_attr_group
.attrs
[attrn
++] = &dev_attr_name
.attr
;
697 indio_dev
->groups
[indio_dev
->groupcounter
++] =
698 &indio_dev
->chan_attr_group
;
703 list_for_each_entry_safe(p
, n
,
704 &indio_dev
->channel_attr_list
, l
) {
706 iio_device_remove_and_free_read_attr(indio_dev
, p
);
712 static void iio_device_unregister_sysfs(struct iio_dev
*indio_dev
)
715 struct iio_dev_attr
*p
, *n
;
717 list_for_each_entry_safe(p
, n
, &indio_dev
->channel_attr_list
, l
) {
719 iio_device_remove_and_free_read_attr(indio_dev
, p
);
721 kfree(indio_dev
->chan_attr_group
.attrs
);
724 static void iio_dev_release(struct device
*device
)
726 struct iio_dev
*indio_dev
= container_of(device
, struct iio_dev
, dev
);
727 cdev_del(&indio_dev
->chrdev
);
728 if (indio_dev
->modes
& INDIO_BUFFER_TRIGGERED
)
729 iio_device_unregister_trigger_consumer(indio_dev
);
730 iio_device_unregister_eventset(indio_dev
);
731 iio_device_unregister_sysfs(indio_dev
);
732 iio_device_unregister_debugfs(indio_dev
);
735 static struct device_type iio_dev_type
= {
736 .name
= "iio_device",
737 .release
= iio_dev_release
,
740 struct iio_dev
*iio_allocate_device(int sizeof_priv
)
745 alloc_size
= sizeof(struct iio_dev
);
747 alloc_size
= ALIGN(alloc_size
, IIO_ALIGN
);
748 alloc_size
+= sizeof_priv
;
750 /* ensure 32-byte alignment of whole construct ? */
751 alloc_size
+= IIO_ALIGN
- 1;
753 dev
= kzalloc(alloc_size
, GFP_KERNEL
);
756 dev
->dev
.groups
= dev
->groups
;
757 dev
->dev
.type
= &iio_dev_type
;
758 dev
->dev
.bus
= &iio_bus_type
;
759 device_initialize(&dev
->dev
);
760 dev_set_drvdata(&dev
->dev
, (void *)dev
);
761 mutex_init(&dev
->mlock
);
762 mutex_init(&dev
->info_exist_lock
);
764 dev
->id
= ida_simple_get(&iio_ida
, 0, 0, GFP_KERNEL
);
766 /* cannot use a dev_err as the name isn't available */
767 printk(KERN_ERR
"Failed to get id\n");
771 dev_set_name(&dev
->dev
, "iio:device%d", dev
->id
);
776 EXPORT_SYMBOL(iio_allocate_device
);
778 void iio_free_device(struct iio_dev
*dev
)
781 ida_simple_remove(&iio_ida
, dev
->id
);
785 EXPORT_SYMBOL(iio_free_device
);
788 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
790 static int iio_chrdev_open(struct inode
*inode
, struct file
*filp
)
792 struct iio_dev
*indio_dev
= container_of(inode
->i_cdev
,
793 struct iio_dev
, chrdev
);
795 if (test_and_set_bit(IIO_BUSY_BIT_POS
, &indio_dev
->flags
))
798 filp
->private_data
= indio_dev
;
804 * iio_chrdev_release() - chrdev file close buffer access and ioctls
806 static int iio_chrdev_release(struct inode
*inode
, struct file
*filp
)
808 struct iio_dev
*indio_dev
= container_of(inode
->i_cdev
,
809 struct iio_dev
, chrdev
);
810 clear_bit(IIO_BUSY_BIT_POS
, &indio_dev
->flags
);
814 /* Somewhat of a cross file organization violation - ioctls here are actually
816 static long iio_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
818 struct iio_dev
*indio_dev
= filp
->private_data
;
819 int __user
*ip
= (int __user
*)arg
;
822 if (cmd
== IIO_GET_EVENT_FD_IOCTL
) {
823 fd
= iio_event_getfd(indio_dev
);
824 if (copy_to_user(ip
, &fd
, sizeof(fd
)))
831 static const struct file_operations iio_buffer_fileops
= {
832 .read
= iio_buffer_read_first_n_outer_addr
,
833 .release
= iio_chrdev_release
,
834 .open
= iio_chrdev_open
,
835 .poll
= iio_buffer_poll_addr
,
836 .owner
= THIS_MODULE
,
837 .llseek
= noop_llseek
,
838 .unlocked_ioctl
= iio_ioctl
,
839 .compat_ioctl
= iio_ioctl
,
842 static const struct iio_buffer_setup_ops noop_ring_setup_ops
;
844 int iio_device_register(struct iio_dev
*indio_dev
)
848 /* configure elements for the chrdev */
849 indio_dev
->dev
.devt
= MKDEV(MAJOR(iio_devt
), indio_dev
->id
);
851 ret
= iio_device_register_debugfs(indio_dev
);
853 dev_err(indio_dev
->dev
.parent
,
854 "Failed to register debugfs interfaces\n");
857 ret
= iio_device_register_sysfs(indio_dev
);
859 dev_err(indio_dev
->dev
.parent
,
860 "Failed to register sysfs interfaces\n");
861 goto error_unreg_debugfs
;
863 ret
= iio_device_register_eventset(indio_dev
);
865 dev_err(indio_dev
->dev
.parent
,
866 "Failed to register event set\n");
867 goto error_free_sysfs
;
869 if (indio_dev
->modes
& INDIO_BUFFER_TRIGGERED
)
870 iio_device_register_trigger_consumer(indio_dev
);
872 if ((indio_dev
->modes
& INDIO_ALL_BUFFER_MODES
) &&
873 indio_dev
->setup_ops
== NULL
)
874 indio_dev
->setup_ops
= &noop_ring_setup_ops
;
876 ret
= device_add(&indio_dev
->dev
);
878 goto error_unreg_eventset
;
879 cdev_init(&indio_dev
->chrdev
, &iio_buffer_fileops
);
880 indio_dev
->chrdev
.owner
= indio_dev
->info
->driver_module
;
881 ret
= cdev_add(&indio_dev
->chrdev
, indio_dev
->dev
.devt
, 1);
883 goto error_del_device
;
887 device_del(&indio_dev
->dev
);
888 error_unreg_eventset
:
889 iio_device_unregister_eventset(indio_dev
);
891 iio_device_unregister_sysfs(indio_dev
);
893 iio_device_unregister_debugfs(indio_dev
);
897 EXPORT_SYMBOL(iio_device_register
);
899 void iio_device_unregister(struct iio_dev
*indio_dev
)
901 mutex_lock(&indio_dev
->info_exist_lock
);
902 indio_dev
->info
= NULL
;
903 mutex_unlock(&indio_dev
->info_exist_lock
);
904 device_unregister(&indio_dev
->dev
);
906 EXPORT_SYMBOL(iio_device_unregister
);
907 subsys_initcall(iio_init
);
908 module_exit(iio_exit
);
910 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
911 MODULE_DESCRIPTION("Industrial I/O core");
912 MODULE_LICENSE("GPL");