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");