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",
68 [IIO_PRESSURE
] = "pressure",
71 static const char * const iio_modifier_names
[] = {
75 [IIO_MOD_ROOT_SUM_SQUARED_X_Y
] = "sqrt(x^2+y^2)",
76 [IIO_MOD_SUM_SQUARED_X_Y_Z
] = "x^2+y^2+z^2",
77 [IIO_MOD_LIGHT_BOTH
] = "both",
78 [IIO_MOD_LIGHT_IR
] = "ir",
79 [IIO_MOD_LIGHT_CLEAR
] = "clear",
80 [IIO_MOD_LIGHT_RED
] = "red",
81 [IIO_MOD_LIGHT_GREEN
] = "green",
82 [IIO_MOD_LIGHT_BLUE
] = "blue",
85 /* relies on pairs of these shared then separate */
86 static const char * const iio_chan_info_postfix
[] = {
87 [IIO_CHAN_INFO_RAW
] = "raw",
88 [IIO_CHAN_INFO_PROCESSED
] = "input",
89 [IIO_CHAN_INFO_SCALE
] = "scale",
90 [IIO_CHAN_INFO_OFFSET
] = "offset",
91 [IIO_CHAN_INFO_CALIBSCALE
] = "calibscale",
92 [IIO_CHAN_INFO_CALIBBIAS
] = "calibbias",
93 [IIO_CHAN_INFO_PEAK
] = "peak_raw",
94 [IIO_CHAN_INFO_PEAK_SCALE
] = "peak_scale",
95 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW
] = "quadrature_correction_raw",
96 [IIO_CHAN_INFO_AVERAGE_RAW
] = "mean_raw",
97 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY
]
98 = "filter_low_pass_3db_frequency",
99 [IIO_CHAN_INFO_SAMP_FREQ
] = "sampling_frequency",
100 [IIO_CHAN_INFO_FREQUENCY
] = "frequency",
101 [IIO_CHAN_INFO_PHASE
] = "phase",
102 [IIO_CHAN_INFO_HARDWAREGAIN
] = "hardwaregain",
103 [IIO_CHAN_INFO_HYSTERESIS
] = "hysteresis",
106 const struct iio_chan_spec
107 *iio_find_channel_from_si(struct iio_dev
*indio_dev
, int si
)
111 for (i
= 0; i
< indio_dev
->num_channels
; i
++)
112 if (indio_dev
->channels
[i
].scan_index
== si
)
113 return &indio_dev
->channels
[i
];
117 /* This turns up an awful lot */
118 ssize_t
iio_read_const_attr(struct device
*dev
,
119 struct device_attribute
*attr
,
122 return sprintf(buf
, "%s\n", to_iio_const_attr(attr
)->string
);
124 EXPORT_SYMBOL(iio_read_const_attr
);
126 static int __init
iio_init(void)
130 /* Register sysfs bus */
131 ret
= bus_register(&iio_bus_type
);
134 "%s could not register bus type\n",
139 ret
= alloc_chrdev_region(&iio_devt
, 0, IIO_DEV_MAX
, "iio");
141 printk(KERN_ERR
"%s: failed to allocate char dev region\n",
143 goto error_unregister_bus_type
;
146 iio_debugfs_dentry
= debugfs_create_dir("iio", NULL
);
150 error_unregister_bus_type
:
151 bus_unregister(&iio_bus_type
);
156 static void __exit
iio_exit(void)
159 unregister_chrdev_region(iio_devt
, IIO_DEV_MAX
);
160 bus_unregister(&iio_bus_type
);
161 debugfs_remove(iio_debugfs_dentry
);
164 #if defined(CONFIG_DEBUG_FS)
165 static ssize_t
iio_debugfs_read_reg(struct file
*file
, char __user
*userbuf
,
166 size_t count
, loff_t
*ppos
)
168 struct iio_dev
*indio_dev
= file
->private_data
;
174 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
,
175 indio_dev
->cached_reg_addr
,
178 dev_err(indio_dev
->dev
.parent
, "%s: read failed\n", __func__
);
180 len
= snprintf(buf
, sizeof(buf
), "0x%X\n", val
);
182 return simple_read_from_buffer(userbuf
, count
, ppos
, buf
, len
);
185 static ssize_t
iio_debugfs_write_reg(struct file
*file
,
186 const char __user
*userbuf
, size_t count
, loff_t
*ppos
)
188 struct iio_dev
*indio_dev
= file
->private_data
;
193 count
= min_t(size_t, count
, (sizeof(buf
)-1));
194 if (copy_from_user(buf
, userbuf
, count
))
199 ret
= sscanf(buf
, "%i %i", ®
, &val
);
203 indio_dev
->cached_reg_addr
= reg
;
206 indio_dev
->cached_reg_addr
= reg
;
207 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
, reg
,
210 dev_err(indio_dev
->dev
.parent
, "%s: write failed\n",
222 static const struct file_operations iio_debugfs_reg_fops
= {
224 .read
= iio_debugfs_read_reg
,
225 .write
= iio_debugfs_write_reg
,
228 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
230 debugfs_remove_recursive(indio_dev
->debugfs_dentry
);
233 static int iio_device_register_debugfs(struct iio_dev
*indio_dev
)
237 if (indio_dev
->info
->debugfs_reg_access
== NULL
)
240 if (!iio_debugfs_dentry
)
243 indio_dev
->debugfs_dentry
=
244 debugfs_create_dir(dev_name(&indio_dev
->dev
),
246 if (indio_dev
->debugfs_dentry
== NULL
) {
247 dev_warn(indio_dev
->dev
.parent
,
248 "Failed to create debugfs directory\n");
252 d
= debugfs_create_file("direct_reg_access", 0644,
253 indio_dev
->debugfs_dentry
,
254 indio_dev
, &iio_debugfs_reg_fops
);
256 iio_device_unregister_debugfs(indio_dev
);
263 static int iio_device_register_debugfs(struct iio_dev
*indio_dev
)
268 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
271 #endif /* CONFIG_DEBUG_FS */
273 static ssize_t
iio_read_channel_ext_info(struct device
*dev
,
274 struct device_attribute
*attr
,
277 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
278 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
279 const struct iio_chan_spec_ext_info
*ext_info
;
281 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
283 return ext_info
->read(indio_dev
, ext_info
->private, this_attr
->c
, buf
);
286 static ssize_t
iio_write_channel_ext_info(struct device
*dev
,
287 struct device_attribute
*attr
,
291 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
292 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
293 const struct iio_chan_spec_ext_info
*ext_info
;
295 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
297 return ext_info
->write(indio_dev
, ext_info
->private,
298 this_attr
->c
, buf
, len
);
301 ssize_t
iio_enum_available_read(struct iio_dev
*indio_dev
,
302 uintptr_t priv
, const struct iio_chan_spec
*chan
, char *buf
)
304 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
311 for (i
= 0; i
< e
->num_items
; ++i
)
312 len
+= scnprintf(buf
+ len
, PAGE_SIZE
- len
, "%s ", e
->items
[i
]);
314 /* replace last space with a newline */
319 EXPORT_SYMBOL_GPL(iio_enum_available_read
);
321 ssize_t
iio_enum_read(struct iio_dev
*indio_dev
,
322 uintptr_t priv
, const struct iio_chan_spec
*chan
, char *buf
)
324 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
330 i
= e
->get(indio_dev
, chan
);
333 else if (i
>= e
->num_items
)
336 return sprintf(buf
, "%s\n", e
->items
[i
]);
338 EXPORT_SYMBOL_GPL(iio_enum_read
);
340 ssize_t
iio_enum_write(struct iio_dev
*indio_dev
,
341 uintptr_t priv
, const struct iio_chan_spec
*chan
, const char *buf
,
344 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
351 for (i
= 0; i
< e
->num_items
; i
++) {
352 if (sysfs_streq(buf
, e
->items
[i
]))
356 if (i
== e
->num_items
)
359 ret
= e
->set(indio_dev
, chan
, i
);
360 return ret
? ret
: len
;
362 EXPORT_SYMBOL_GPL(iio_enum_write
);
364 static ssize_t
iio_read_channel_info(struct device
*dev
,
365 struct device_attribute
*attr
,
368 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
369 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
370 unsigned long long tmp
;
372 bool scale_db
= false;
373 int ret
= indio_dev
->info
->read_raw(indio_dev
, this_attr
->c
,
374 &val
, &val2
, this_attr
->address
);
381 return sprintf(buf
, "%d\n", val
);
382 case IIO_VAL_INT_PLUS_MICRO_DB
:
384 case IIO_VAL_INT_PLUS_MICRO
:
386 return sprintf(buf
, "-%ld.%06u%s\n", abs(val
), -val2
,
387 scale_db
? " dB" : "");
389 return sprintf(buf
, "%d.%06u%s\n", val
, val2
,
390 scale_db
? " dB" : "");
391 case IIO_VAL_INT_PLUS_NANO
:
393 return sprintf(buf
, "-%ld.%09u\n", abs(val
), -val2
);
395 return sprintf(buf
, "%d.%09u\n", val
, val2
);
396 case IIO_VAL_FRACTIONAL
:
397 tmp
= div_s64((s64
)val
* 1000000000LL, val2
);
398 val2
= do_div(tmp
, 1000000000LL);
400 return sprintf(buf
, "%d.%09u\n", val
, val2
);
401 case IIO_VAL_FRACTIONAL_LOG2
:
402 tmp
= (s64
)val
* 1000000000LL >> val2
;
403 val2
= do_div(tmp
, 1000000000LL);
405 return sprintf(buf
, "%d.%09u\n", val
, val2
);
412 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
413 * @str: The string to parse
414 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
415 * @integer: The integer part of the number
416 * @fract: The fractional part of the number
418 * Returns 0 on success, or a negative error code if the string could not be
421 int iio_str_to_fixpoint(const char *str
, int fract_mult
,
422 int *integer
, int *fract
)
425 bool integer_part
= true, negative
= false;
430 } else if (str
[0] == '+') {
435 if ('0' <= *str
&& *str
<= '9') {
437 i
= i
* 10 + *str
- '0';
439 f
+= fract_mult
* (*str
- '0');
442 } else if (*str
== '\n') {
443 if (*(str
+ 1) == '\0')
447 } else if (*str
== '.' && integer_part
) {
448 integer_part
= false;
467 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint
);
469 static ssize_t
iio_write_channel_info(struct device
*dev
,
470 struct device_attribute
*attr
,
474 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
475 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
476 int ret
, fract_mult
= 100000;
479 /* Assumes decimal - precision based on number of digits */
480 if (!indio_dev
->info
->write_raw
)
483 if (indio_dev
->info
->write_raw_get_fmt
)
484 switch (indio_dev
->info
->write_raw_get_fmt(indio_dev
,
485 this_attr
->c
, this_attr
->address
)) {
486 case IIO_VAL_INT_PLUS_MICRO
:
489 case IIO_VAL_INT_PLUS_NANO
:
490 fract_mult
= 100000000;
496 ret
= iio_str_to_fixpoint(buf
, fract_mult
, &integer
, &fract
);
500 ret
= indio_dev
->info
->write_raw(indio_dev
, this_attr
->c
,
501 integer
, fract
, this_attr
->address
);
509 int __iio_device_attr_init(struct device_attribute
*dev_attr
,
511 struct iio_chan_spec
const *chan
,
512 ssize_t (*readfunc
)(struct device
*dev
,
513 struct device_attribute
*attr
,
515 ssize_t (*writefunc
)(struct device
*dev
,
516 struct device_attribute
*attr
,
522 char *name_format
, *full_postfix
;
523 sysfs_attr_init(&dev_attr
->attr
);
525 /* Build up postfix of <extend_name>_<modifier>_postfix */
526 if (chan
->modified
&& !generic
) {
527 if (chan
->extend_name
)
528 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s_%s",
529 iio_modifier_names
[chan
534 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s",
535 iio_modifier_names
[chan
539 if (chan
->extend_name
== NULL
)
540 full_postfix
= kstrdup(postfix
, GFP_KERNEL
);
542 full_postfix
= kasprintf(GFP_KERNEL
,
547 if (full_postfix
== NULL
) {
552 if (chan
->differential
) { /* Differential can not have modifier */
555 = kasprintf(GFP_KERNEL
, "%s_%s-%s_%s",
556 iio_direction
[chan
->output
],
557 iio_chan_type_name_spec
[chan
->type
],
558 iio_chan_type_name_spec
[chan
->type
],
560 else if (chan
->indexed
)
562 = kasprintf(GFP_KERNEL
, "%s_%s%d-%s%d_%s",
563 iio_direction
[chan
->output
],
564 iio_chan_type_name_spec
[chan
->type
],
566 iio_chan_type_name_spec
[chan
->type
],
570 WARN_ON("Differential channels must be indexed\n");
572 goto error_free_full_postfix
;
574 } else { /* Single ended */
577 = kasprintf(GFP_KERNEL
, "%s_%s_%s",
578 iio_direction
[chan
->output
],
579 iio_chan_type_name_spec
[chan
->type
],
581 else if (chan
->indexed
)
583 = kasprintf(GFP_KERNEL
, "%s_%s%d_%s",
584 iio_direction
[chan
->output
],
585 iio_chan_type_name_spec
[chan
->type
],
590 = kasprintf(GFP_KERNEL
, "%s_%s_%s",
591 iio_direction
[chan
->output
],
592 iio_chan_type_name_spec
[chan
->type
],
595 if (name_format
== NULL
) {
597 goto error_free_full_postfix
;
599 dev_attr
->attr
.name
= kasprintf(GFP_KERNEL
,
603 if (dev_attr
->attr
.name
== NULL
) {
605 goto error_free_name_format
;
609 dev_attr
->attr
.mode
|= S_IRUGO
;
610 dev_attr
->show
= readfunc
;
614 dev_attr
->attr
.mode
|= S_IWUSR
;
615 dev_attr
->store
= writefunc
;
622 error_free_name_format
:
624 error_free_full_postfix
:
630 static void __iio_device_attr_deinit(struct device_attribute
*dev_attr
)
632 kfree(dev_attr
->attr
.name
);
635 int __iio_add_chan_devattr(const char *postfix
,
636 struct iio_chan_spec
const *chan
,
637 ssize_t (*readfunc
)(struct device
*dev
,
638 struct device_attribute
*attr
,
640 ssize_t (*writefunc
)(struct device
*dev
,
641 struct device_attribute
*attr
,
647 struct list_head
*attr_list
)
650 struct iio_dev_attr
*iio_attr
, *t
;
652 iio_attr
= kzalloc(sizeof *iio_attr
, GFP_KERNEL
);
653 if (iio_attr
== NULL
) {
657 ret
= __iio_device_attr_init(&iio_attr
->dev_attr
,
659 readfunc
, writefunc
, generic
);
661 goto error_iio_dev_attr_free
;
663 iio_attr
->address
= mask
;
664 list_for_each_entry(t
, attr_list
, l
)
665 if (strcmp(t
->dev_attr
.attr
.name
,
666 iio_attr
->dev_attr
.attr
.name
) == 0) {
668 dev_err(dev
, "tried to double register : %s\n",
669 t
->dev_attr
.attr
.name
);
671 goto error_device_attr_deinit
;
673 list_add(&iio_attr
->l
, attr_list
);
677 error_device_attr_deinit
:
678 __iio_device_attr_deinit(&iio_attr
->dev_attr
);
679 error_iio_dev_attr_free
:
685 static int iio_device_add_channel_sysfs(struct iio_dev
*indio_dev
,
686 struct iio_chan_spec
const *chan
)
688 int ret
, attrcount
= 0;
690 const struct iio_chan_spec_ext_info
*ext_info
;
692 if (chan
->channel
< 0)
694 for_each_set_bit(i
, &chan
->info_mask_separate
, sizeof(long)*8) {
695 ret
= __iio_add_chan_devattr(iio_chan_info_postfix
[i
],
697 &iio_read_channel_info
,
698 &iio_write_channel_info
,
702 &indio_dev
->channel_attr_list
);
707 for_each_set_bit(i
, &chan
->info_mask_shared_by_type
, sizeof(long)*8) {
708 ret
= __iio_add_chan_devattr(iio_chan_info_postfix
[i
],
710 &iio_read_channel_info
,
711 &iio_write_channel_info
,
715 &indio_dev
->channel_attr_list
);
719 } else if (ret
< 0) {
725 if (chan
->ext_info
) {
727 for (ext_info
= chan
->ext_info
; ext_info
->name
; ext_info
++) {
728 ret
= __iio_add_chan_devattr(ext_info
->name
,
731 &iio_read_channel_ext_info
: NULL
,
733 &iio_write_channel_ext_info
: NULL
,
737 &indio_dev
->channel_attr_list
);
739 if (ret
== -EBUSY
&& ext_info
->shared
)
754 static void iio_device_remove_and_free_read_attr(struct iio_dev
*indio_dev
,
755 struct iio_dev_attr
*p
)
757 kfree(p
->dev_attr
.attr
.name
);
761 static ssize_t
iio_show_dev_name(struct device
*dev
,
762 struct device_attribute
*attr
,
765 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
766 return sprintf(buf
, "%s\n", indio_dev
->name
);
769 static DEVICE_ATTR(name
, S_IRUGO
, iio_show_dev_name
, NULL
);
771 static int iio_device_register_sysfs(struct iio_dev
*indio_dev
)
773 int i
, ret
= 0, attrcount
, attrn
, attrcount_orig
= 0;
774 struct iio_dev_attr
*p
, *n
;
775 struct attribute
**attr
;
777 /* First count elements in any existing group */
778 if (indio_dev
->info
->attrs
) {
779 attr
= indio_dev
->info
->attrs
->attrs
;
780 while (*attr
++ != NULL
)
783 attrcount
= attrcount_orig
;
785 * New channel registration method - relies on the fact a group does
786 * not need to be initialized if its name is NULL.
788 if (indio_dev
->channels
)
789 for (i
= 0; i
< indio_dev
->num_channels
; i
++) {
790 ret
= iio_device_add_channel_sysfs(indio_dev
,
794 goto error_clear_attrs
;
801 indio_dev
->chan_attr_group
.attrs
= kcalloc(attrcount
+ 1,
802 sizeof(indio_dev
->chan_attr_group
.attrs
[0]),
804 if (indio_dev
->chan_attr_group
.attrs
== NULL
) {
806 goto error_clear_attrs
;
808 /* Copy across original attributes */
809 if (indio_dev
->info
->attrs
)
810 memcpy(indio_dev
->chan_attr_group
.attrs
,
811 indio_dev
->info
->attrs
->attrs
,
812 sizeof(indio_dev
->chan_attr_group
.attrs
[0])
814 attrn
= attrcount_orig
;
815 /* Add all elements from the list. */
816 list_for_each_entry(p
, &indio_dev
->channel_attr_list
, l
)
817 indio_dev
->chan_attr_group
.attrs
[attrn
++] = &p
->dev_attr
.attr
;
819 indio_dev
->chan_attr_group
.attrs
[attrn
++] = &dev_attr_name
.attr
;
821 indio_dev
->groups
[indio_dev
->groupcounter
++] =
822 &indio_dev
->chan_attr_group
;
827 list_for_each_entry_safe(p
, n
,
828 &indio_dev
->channel_attr_list
, l
) {
830 iio_device_remove_and_free_read_attr(indio_dev
, p
);
836 static void iio_device_unregister_sysfs(struct iio_dev
*indio_dev
)
839 struct iio_dev_attr
*p
, *n
;
841 list_for_each_entry_safe(p
, n
, &indio_dev
->channel_attr_list
, l
) {
843 iio_device_remove_and_free_read_attr(indio_dev
, p
);
845 kfree(indio_dev
->chan_attr_group
.attrs
);
848 static void iio_dev_release(struct device
*device
)
850 struct iio_dev
*indio_dev
= dev_to_iio_dev(device
);
851 if (indio_dev
->modes
& INDIO_BUFFER_TRIGGERED
)
852 iio_device_unregister_trigger_consumer(indio_dev
);
853 iio_device_unregister_eventset(indio_dev
);
854 iio_device_unregister_sysfs(indio_dev
);
855 iio_device_unregister_debugfs(indio_dev
);
857 ida_simple_remove(&iio_ida
, indio_dev
->id
);
861 struct device_type iio_device_type
= {
862 .name
= "iio_device",
863 .release
= iio_dev_release
,
866 struct iio_dev
*iio_device_alloc(int sizeof_priv
)
871 alloc_size
= sizeof(struct iio_dev
);
873 alloc_size
= ALIGN(alloc_size
, IIO_ALIGN
);
874 alloc_size
+= sizeof_priv
;
876 /* ensure 32-byte alignment of whole construct ? */
877 alloc_size
+= IIO_ALIGN
- 1;
879 dev
= kzalloc(alloc_size
, GFP_KERNEL
);
882 dev
->dev
.groups
= dev
->groups
;
883 dev
->dev
.type
= &iio_device_type
;
884 dev
->dev
.bus
= &iio_bus_type
;
885 device_initialize(&dev
->dev
);
886 dev_set_drvdata(&dev
->dev
, (void *)dev
);
887 mutex_init(&dev
->mlock
);
888 mutex_init(&dev
->info_exist_lock
);
889 INIT_LIST_HEAD(&dev
->channel_attr_list
);
891 dev
->id
= ida_simple_get(&iio_ida
, 0, 0, GFP_KERNEL
);
893 /* cannot use a dev_err as the name isn't available */
894 printk(KERN_ERR
"Failed to get id\n");
898 dev_set_name(&dev
->dev
, "iio:device%d", dev
->id
);
899 INIT_LIST_HEAD(&dev
->buffer_list
);
904 EXPORT_SYMBOL(iio_device_alloc
);
906 void iio_device_free(struct iio_dev
*dev
)
909 put_device(&dev
->dev
);
911 EXPORT_SYMBOL(iio_device_free
);
913 static void devm_iio_device_release(struct device
*dev
, void *res
)
915 iio_device_free(*(struct iio_dev
**)res
);
918 static int devm_iio_device_match(struct device
*dev
, void *res
, void *data
)
920 struct iio_dev
**r
= res
;
928 struct iio_dev
*devm_iio_device_alloc(struct device
*dev
, int sizeof_priv
)
930 struct iio_dev
**ptr
, *iio_dev
;
932 ptr
= devres_alloc(devm_iio_device_release
, sizeof(*ptr
),
937 /* use raw alloc_dr for kmalloc caller tracing */
938 iio_dev
= iio_device_alloc(sizeof_priv
);
941 devres_add(dev
, ptr
);
948 EXPORT_SYMBOL_GPL(devm_iio_device_alloc
);
950 void devm_iio_device_free(struct device
*dev
, struct iio_dev
*iio_dev
)
954 rc
= devres_release(dev
, devm_iio_device_release
,
955 devm_iio_device_match
, iio_dev
);
958 EXPORT_SYMBOL_GPL(devm_iio_device_free
);
961 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
963 static int iio_chrdev_open(struct inode
*inode
, struct file
*filp
)
965 struct iio_dev
*indio_dev
= container_of(inode
->i_cdev
,
966 struct iio_dev
, chrdev
);
968 if (test_and_set_bit(IIO_BUSY_BIT_POS
, &indio_dev
->flags
))
971 iio_device_get(indio_dev
);
973 filp
->private_data
= indio_dev
;
979 * iio_chrdev_release() - chrdev file close buffer access and ioctls
981 static int iio_chrdev_release(struct inode
*inode
, struct file
*filp
)
983 struct iio_dev
*indio_dev
= container_of(inode
->i_cdev
,
984 struct iio_dev
, chrdev
);
985 clear_bit(IIO_BUSY_BIT_POS
, &indio_dev
->flags
);
986 iio_device_put(indio_dev
);
991 /* Somewhat of a cross file organization violation - ioctls here are actually
993 static long iio_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
995 struct iio_dev
*indio_dev
= filp
->private_data
;
996 int __user
*ip
= (int __user
*)arg
;
999 if (cmd
== IIO_GET_EVENT_FD_IOCTL
) {
1000 fd
= iio_event_getfd(indio_dev
);
1001 if (copy_to_user(ip
, &fd
, sizeof(fd
)))
1008 static const struct file_operations iio_buffer_fileops
= {
1009 .read
= iio_buffer_read_first_n_outer_addr
,
1010 .release
= iio_chrdev_release
,
1011 .open
= iio_chrdev_open
,
1012 .poll
= iio_buffer_poll_addr
,
1013 .owner
= THIS_MODULE
,
1014 .llseek
= noop_llseek
,
1015 .unlocked_ioctl
= iio_ioctl
,
1016 .compat_ioctl
= iio_ioctl
,
1019 static const struct iio_buffer_setup_ops noop_ring_setup_ops
;
1021 int iio_device_register(struct iio_dev
*indio_dev
)
1025 /* If the calling driver did not initialize of_node, do it here */
1026 if (!indio_dev
->dev
.of_node
&& indio_dev
->dev
.parent
)
1027 indio_dev
->dev
.of_node
= indio_dev
->dev
.parent
->of_node
;
1029 /* configure elements for the chrdev */
1030 indio_dev
->dev
.devt
= MKDEV(MAJOR(iio_devt
), indio_dev
->id
);
1032 ret
= iio_device_register_debugfs(indio_dev
);
1034 dev_err(indio_dev
->dev
.parent
,
1035 "Failed to register debugfs interfaces\n");
1038 ret
= iio_device_register_sysfs(indio_dev
);
1040 dev_err(indio_dev
->dev
.parent
,
1041 "Failed to register sysfs interfaces\n");
1042 goto error_unreg_debugfs
;
1044 ret
= iio_device_register_eventset(indio_dev
);
1046 dev_err(indio_dev
->dev
.parent
,
1047 "Failed to register event set\n");
1048 goto error_free_sysfs
;
1050 if (indio_dev
->modes
& INDIO_BUFFER_TRIGGERED
)
1051 iio_device_register_trigger_consumer(indio_dev
);
1053 if ((indio_dev
->modes
& INDIO_ALL_BUFFER_MODES
) &&
1054 indio_dev
->setup_ops
== NULL
)
1055 indio_dev
->setup_ops
= &noop_ring_setup_ops
;
1057 cdev_init(&indio_dev
->chrdev
, &iio_buffer_fileops
);
1058 indio_dev
->chrdev
.owner
= indio_dev
->info
->driver_module
;
1059 indio_dev
->chrdev
.kobj
.parent
= &indio_dev
->dev
.kobj
;
1060 ret
= cdev_add(&indio_dev
->chrdev
, indio_dev
->dev
.devt
, 1);
1062 goto error_unreg_eventset
;
1064 ret
= device_add(&indio_dev
->dev
);
1066 goto error_cdev_del
;
1070 cdev_del(&indio_dev
->chrdev
);
1071 error_unreg_eventset
:
1072 iio_device_unregister_eventset(indio_dev
);
1074 iio_device_unregister_sysfs(indio_dev
);
1075 error_unreg_debugfs
:
1076 iio_device_unregister_debugfs(indio_dev
);
1080 EXPORT_SYMBOL(iio_device_register
);
1082 void iio_device_unregister(struct iio_dev
*indio_dev
)
1084 mutex_lock(&indio_dev
->info_exist_lock
);
1086 device_del(&indio_dev
->dev
);
1088 if (indio_dev
->chrdev
.dev
)
1089 cdev_del(&indio_dev
->chrdev
);
1091 iio_disable_all_buffers(indio_dev
);
1093 indio_dev
->info
= NULL
;
1094 mutex_unlock(&indio_dev
->info_exist_lock
);
1096 EXPORT_SYMBOL(iio_device_unregister
);
1097 subsys_initcall(iio_init
);
1098 module_exit(iio_exit
);
1100 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1101 MODULE_DESCRIPTION("Industrial I/O core");
1102 MODULE_LICENSE("GPL");