1 // SPDX-License-Identifier: GPL-2.0-only
2 /* The industrial I/O core
4 * Copyright (c) 2008 Jonathan Cameron
6 * Based on elements of hwmon and input subsystems.
9 #define pr_fmt(fmt) "iio-core: " fmt
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/idr.h>
14 #include <linux/kdev_t.h>
15 #include <linux/err.h>
16 #include <linux/device.h>
18 #include <linux/poll.h>
19 #include <linux/property.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/mutex.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/iio-opaque.h>
30 #include "iio_core_trigger.h"
31 #include <linux/iio/sysfs.h>
32 #include <linux/iio/events.h>
33 #include <linux/iio/buffer.h>
34 #include <linux/iio/buffer_impl.h>
36 /* IDA to assign each registered device a unique id */
37 static DEFINE_IDA(iio_ida
);
39 static dev_t iio_devt
;
41 #define IIO_DEV_MAX 256
42 struct bus_type iio_bus_type
= {
45 EXPORT_SYMBOL(iio_bus_type
);
47 static struct dentry
*iio_debugfs_dentry
;
49 static const char * const iio_direction
[] = {
54 static const char * const iio_chan_type_name_spec
[] = {
55 [IIO_VOLTAGE
] = "voltage",
56 [IIO_CURRENT
] = "current",
57 [IIO_POWER
] = "power",
58 [IIO_ACCEL
] = "accel",
59 [IIO_ANGL_VEL
] = "anglvel",
61 [IIO_LIGHT
] = "illuminance",
62 [IIO_INTENSITY
] = "intensity",
63 [IIO_PROXIMITY
] = "proximity",
65 [IIO_INCLI
] = "incli",
68 [IIO_TIMESTAMP
] = "timestamp",
69 [IIO_CAPACITANCE
] = "capacitance",
70 [IIO_ALTVOLTAGE
] = "altvoltage",
72 [IIO_PRESSURE
] = "pressure",
73 [IIO_HUMIDITYRELATIVE
] = "humidityrelative",
74 [IIO_ACTIVITY
] = "activity",
75 [IIO_STEPS
] = "steps",
76 [IIO_ENERGY
] = "energy",
77 [IIO_DISTANCE
] = "distance",
78 [IIO_VELOCITY
] = "velocity",
79 [IIO_CONCENTRATION
] = "concentration",
80 [IIO_RESISTANCE
] = "resistance",
82 [IIO_UVINDEX
] = "uvindex",
83 [IIO_ELECTRICALCONDUCTIVITY
] = "electricalconductivity",
84 [IIO_COUNT
] = "count",
85 [IIO_INDEX
] = "index",
86 [IIO_GRAVITY
] = "gravity",
87 [IIO_POSITIONRELATIVE
] = "positionrelative",
88 [IIO_PHASE
] = "phase",
89 [IIO_MASSCONCENTRATION
] = "massconcentration",
92 static const char * const iio_modifier_names
[] = {
96 [IIO_MOD_X_AND_Y
] = "x&y",
97 [IIO_MOD_X_AND_Z
] = "x&z",
98 [IIO_MOD_Y_AND_Z
] = "y&z",
99 [IIO_MOD_X_AND_Y_AND_Z
] = "x&y&z",
100 [IIO_MOD_X_OR_Y
] = "x|y",
101 [IIO_MOD_X_OR_Z
] = "x|z",
102 [IIO_MOD_Y_OR_Z
] = "y|z",
103 [IIO_MOD_X_OR_Y_OR_Z
] = "x|y|z",
104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y
] = "sqrt(x^2+y^2)",
105 [IIO_MOD_SUM_SQUARED_X_Y_Z
] = "x^2+y^2+z^2",
106 [IIO_MOD_LIGHT_BOTH
] = "both",
107 [IIO_MOD_LIGHT_IR
] = "ir",
108 [IIO_MOD_LIGHT_CLEAR
] = "clear",
109 [IIO_MOD_LIGHT_RED
] = "red",
110 [IIO_MOD_LIGHT_GREEN
] = "green",
111 [IIO_MOD_LIGHT_BLUE
] = "blue",
112 [IIO_MOD_LIGHT_UV
] = "uv",
113 [IIO_MOD_LIGHT_DUV
] = "duv",
114 [IIO_MOD_QUATERNION
] = "quaternion",
115 [IIO_MOD_TEMP_AMBIENT
] = "ambient",
116 [IIO_MOD_TEMP_OBJECT
] = "object",
117 [IIO_MOD_NORTH_MAGN
] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE
] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP
] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP
] = "from_north_true_tilt_comp",
121 [IIO_MOD_RUNNING
] = "running",
122 [IIO_MOD_JOGGING
] = "jogging",
123 [IIO_MOD_WALKING
] = "walking",
124 [IIO_MOD_STILL
] = "still",
125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z
] = "sqrt(x^2+y^2+z^2)",
128 [IIO_MOD_CO2
] = "co2",
129 [IIO_MOD_VOC
] = "voc",
130 [IIO_MOD_PM1
] = "pm1",
131 [IIO_MOD_PM2P5
] = "pm2p5",
132 [IIO_MOD_PM4
] = "pm4",
133 [IIO_MOD_PM10
] = "pm10",
134 [IIO_MOD_ETHANOL
] = "ethanol",
139 /* relies on pairs of these shared then separate */
140 static const char * const iio_chan_info_postfix
[] = {
141 [IIO_CHAN_INFO_RAW
] = "raw",
142 [IIO_CHAN_INFO_PROCESSED
] = "input",
143 [IIO_CHAN_INFO_SCALE
] = "scale",
144 [IIO_CHAN_INFO_OFFSET
] = "offset",
145 [IIO_CHAN_INFO_CALIBSCALE
] = "calibscale",
146 [IIO_CHAN_INFO_CALIBBIAS
] = "calibbias",
147 [IIO_CHAN_INFO_PEAK
] = "peak_raw",
148 [IIO_CHAN_INFO_PEAK_SCALE
] = "peak_scale",
149 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW
] = "quadrature_correction_raw",
150 [IIO_CHAN_INFO_AVERAGE_RAW
] = "mean_raw",
151 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY
]
152 = "filter_low_pass_3db_frequency",
153 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY
]
154 = "filter_high_pass_3db_frequency",
155 [IIO_CHAN_INFO_SAMP_FREQ
] = "sampling_frequency",
156 [IIO_CHAN_INFO_FREQUENCY
] = "frequency",
157 [IIO_CHAN_INFO_PHASE
] = "phase",
158 [IIO_CHAN_INFO_HARDWAREGAIN
] = "hardwaregain",
159 [IIO_CHAN_INFO_HYSTERESIS
] = "hysteresis",
160 [IIO_CHAN_INFO_HYSTERESIS_RELATIVE
] = "hysteresis_relative",
161 [IIO_CHAN_INFO_INT_TIME
] = "integration_time",
162 [IIO_CHAN_INFO_ENABLE
] = "en",
163 [IIO_CHAN_INFO_CALIBHEIGHT
] = "calibheight",
164 [IIO_CHAN_INFO_CALIBWEIGHT
] = "calibweight",
165 [IIO_CHAN_INFO_DEBOUNCE_COUNT
] = "debounce_count",
166 [IIO_CHAN_INFO_DEBOUNCE_TIME
] = "debounce_time",
167 [IIO_CHAN_INFO_CALIBEMISSIVITY
] = "calibemissivity",
168 [IIO_CHAN_INFO_OVERSAMPLING_RATIO
] = "oversampling_ratio",
169 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE
] = "thermocouple_type",
170 [IIO_CHAN_INFO_CALIBAMBIENT
] = "calibambient",
173 * iio_device_id() - query the unique ID for the device
174 * @indio_dev: Device structure whose ID is being queried
176 * The IIO device ID is a unique index used for example for the naming
177 * of the character device /dev/iio\:device[ID]
179 int iio_device_id(struct iio_dev
*indio_dev
)
181 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
183 return iio_dev_opaque
->id
;
185 EXPORT_SYMBOL_GPL(iio_device_id
);
188 * iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
189 * @array: array of strings
190 * @n: number of strings in the array
191 * @str: string to match with
193 * Returns index of @str in the @array or -EINVAL, similar to match_string().
194 * Uses sysfs_streq instead of strcmp for matching.
196 * This routine will look for a string in an array of strings.
197 * The search will continue until the element is found or the n-th element
198 * is reached, regardless of any NULL elements in the array.
200 static int iio_sysfs_match_string_with_gaps(const char * const *array
, size_t n
,
206 for (index
= 0; index
< n
; index
++) {
210 if (sysfs_streq(item
, str
))
217 #if defined(CONFIG_DEBUG_FS)
219 * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
220 * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
222 struct dentry
*iio_get_debugfs_dentry(struct iio_dev
*indio_dev
)
224 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
225 return iio_dev_opaque
->debugfs_dentry
;
227 EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry
);
231 * iio_find_channel_from_si() - get channel from its scan index
233 * @si: scan index to match
235 const struct iio_chan_spec
236 *iio_find_channel_from_si(struct iio_dev
*indio_dev
, int si
)
240 for (i
= 0; i
< indio_dev
->num_channels
; i
++)
241 if (indio_dev
->channels
[i
].scan_index
== si
)
242 return &indio_dev
->channels
[i
];
246 /* This turns up an awful lot */
247 ssize_t
iio_read_const_attr(struct device
*dev
,
248 struct device_attribute
*attr
,
251 return sysfs_emit(buf
, "%s\n", to_iio_const_attr(attr
)->string
);
253 EXPORT_SYMBOL(iio_read_const_attr
);
256 * iio_device_set_clock() - Set current timestamping clock for the device
257 * @indio_dev: IIO device structure containing the device
258 * @clock_id: timestamping clock posix identifier to set.
260 int iio_device_set_clock(struct iio_dev
*indio_dev
, clockid_t clock_id
)
263 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
264 const struct iio_event_interface
*ev_int
= iio_dev_opaque
->event_interface
;
266 ret
= mutex_lock_interruptible(&indio_dev
->mlock
);
269 if ((ev_int
&& iio_event_enabled(ev_int
)) ||
270 iio_buffer_enabled(indio_dev
)) {
271 mutex_unlock(&indio_dev
->mlock
);
274 iio_dev_opaque
->clock_id
= clock_id
;
275 mutex_unlock(&indio_dev
->mlock
);
279 EXPORT_SYMBOL(iio_device_set_clock
);
282 * iio_device_get_clock() - Retrieve current timestamping clock for the device
283 * @indio_dev: IIO device structure containing the device
285 clockid_t
iio_device_get_clock(const struct iio_dev
*indio_dev
)
287 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
289 return iio_dev_opaque
->clock_id
;
291 EXPORT_SYMBOL(iio_device_get_clock
);
294 * iio_get_time_ns() - utility function to get a time stamp for events etc
297 s64
iio_get_time_ns(const struct iio_dev
*indio_dev
)
299 struct timespec64 tp
;
301 switch (iio_device_get_clock(indio_dev
)) {
303 return ktime_get_real_ns();
304 case CLOCK_MONOTONIC
:
305 return ktime_get_ns();
306 case CLOCK_MONOTONIC_RAW
:
307 return ktime_get_raw_ns();
308 case CLOCK_REALTIME_COARSE
:
309 return ktime_to_ns(ktime_get_coarse_real());
310 case CLOCK_MONOTONIC_COARSE
:
311 ktime_get_coarse_ts64(&tp
);
312 return timespec64_to_ns(&tp
);
314 return ktime_get_boottime_ns();
316 return ktime_get_clocktai_ns();
321 EXPORT_SYMBOL(iio_get_time_ns
);
324 * iio_get_time_res() - utility function to get time stamp clock resolution in
328 unsigned int iio_get_time_res(const struct iio_dev
*indio_dev
)
330 switch (iio_device_get_clock(indio_dev
)) {
332 case CLOCK_MONOTONIC
:
333 case CLOCK_MONOTONIC_RAW
:
336 return hrtimer_resolution
;
337 case CLOCK_REALTIME_COARSE
:
338 case CLOCK_MONOTONIC_COARSE
:
344 EXPORT_SYMBOL(iio_get_time_res
);
346 static int __init
iio_init(void)
350 /* Register sysfs bus */
351 ret
= bus_register(&iio_bus_type
);
353 pr_err("could not register bus type\n");
357 ret
= alloc_chrdev_region(&iio_devt
, 0, IIO_DEV_MAX
, "iio");
359 pr_err("failed to allocate char dev region\n");
360 goto error_unregister_bus_type
;
363 iio_debugfs_dentry
= debugfs_create_dir("iio", NULL
);
367 error_unregister_bus_type
:
368 bus_unregister(&iio_bus_type
);
373 static void __exit
iio_exit(void)
376 unregister_chrdev_region(iio_devt
, IIO_DEV_MAX
);
377 bus_unregister(&iio_bus_type
);
378 debugfs_remove(iio_debugfs_dentry
);
381 #if defined(CONFIG_DEBUG_FS)
382 static ssize_t
iio_debugfs_read_reg(struct file
*file
, char __user
*userbuf
,
383 size_t count
, loff_t
*ppos
)
385 struct iio_dev
*indio_dev
= file
->private_data
;
386 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
391 return simple_read_from_buffer(userbuf
, count
, ppos
,
392 iio_dev_opaque
->read_buf
,
393 iio_dev_opaque
->read_buf_len
);
395 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
,
396 iio_dev_opaque
->cached_reg_addr
,
399 dev_err(indio_dev
->dev
.parent
, "%s: read failed\n", __func__
);
403 iio_dev_opaque
->read_buf_len
= snprintf(iio_dev_opaque
->read_buf
,
404 sizeof(iio_dev_opaque
->read_buf
),
407 return simple_read_from_buffer(userbuf
, count
, ppos
,
408 iio_dev_opaque
->read_buf
,
409 iio_dev_opaque
->read_buf_len
);
412 static ssize_t
iio_debugfs_write_reg(struct file
*file
,
413 const char __user
*userbuf
, size_t count
, loff_t
*ppos
)
415 struct iio_dev
*indio_dev
= file
->private_data
;
416 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
421 count
= min_t(size_t, count
, (sizeof(buf
)-1));
422 if (copy_from_user(buf
, userbuf
, count
))
427 ret
= sscanf(buf
, "%i %i", ®
, &val
);
431 iio_dev_opaque
->cached_reg_addr
= reg
;
434 iio_dev_opaque
->cached_reg_addr
= reg
;
435 ret
= indio_dev
->info
->debugfs_reg_access(indio_dev
, reg
,
438 dev_err(indio_dev
->dev
.parent
, "%s: write failed\n",
450 static const struct file_operations iio_debugfs_reg_fops
= {
452 .read
= iio_debugfs_read_reg
,
453 .write
= iio_debugfs_write_reg
,
456 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
458 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
459 debugfs_remove_recursive(iio_dev_opaque
->debugfs_dentry
);
462 static void iio_device_register_debugfs(struct iio_dev
*indio_dev
)
464 struct iio_dev_opaque
*iio_dev_opaque
;
466 if (indio_dev
->info
->debugfs_reg_access
== NULL
)
469 if (!iio_debugfs_dentry
)
472 iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
474 iio_dev_opaque
->debugfs_dentry
=
475 debugfs_create_dir(dev_name(&indio_dev
->dev
),
478 debugfs_create_file("direct_reg_access", 0644,
479 iio_dev_opaque
->debugfs_dentry
, indio_dev
,
480 &iio_debugfs_reg_fops
);
483 static void iio_device_register_debugfs(struct iio_dev
*indio_dev
)
487 static void iio_device_unregister_debugfs(struct iio_dev
*indio_dev
)
490 #endif /* CONFIG_DEBUG_FS */
492 static ssize_t
iio_read_channel_ext_info(struct device
*dev
,
493 struct device_attribute
*attr
,
496 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
497 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
498 const struct iio_chan_spec_ext_info
*ext_info
;
500 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
502 return ext_info
->read(indio_dev
, ext_info
->private, this_attr
->c
, buf
);
505 static ssize_t
iio_write_channel_ext_info(struct device
*dev
,
506 struct device_attribute
*attr
,
510 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
511 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
512 const struct iio_chan_spec_ext_info
*ext_info
;
514 ext_info
= &this_attr
->c
->ext_info
[this_attr
->address
];
516 return ext_info
->write(indio_dev
, ext_info
->private,
517 this_attr
->c
, buf
, len
);
520 ssize_t
iio_enum_available_read(struct iio_dev
*indio_dev
,
521 uintptr_t priv
, const struct iio_chan_spec
*chan
, char *buf
)
523 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
530 for (i
= 0; i
< e
->num_items
; ++i
) {
533 len
+= sysfs_emit_at(buf
, len
, "%s ", e
->items
[i
]);
536 /* replace last space with a newline */
541 EXPORT_SYMBOL_GPL(iio_enum_available_read
);
543 ssize_t
iio_enum_read(struct iio_dev
*indio_dev
,
544 uintptr_t priv
, const struct iio_chan_spec
*chan
, char *buf
)
546 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
552 i
= e
->get(indio_dev
, chan
);
555 else if (i
>= e
->num_items
|| !e
->items
[i
])
558 return sysfs_emit(buf
, "%s\n", e
->items
[i
]);
560 EXPORT_SYMBOL_GPL(iio_enum_read
);
562 ssize_t
iio_enum_write(struct iio_dev
*indio_dev
,
563 uintptr_t priv
, const struct iio_chan_spec
*chan
, const char *buf
,
566 const struct iio_enum
*e
= (const struct iio_enum
*)priv
;
572 ret
= iio_sysfs_match_string_with_gaps(e
->items
, e
->num_items
, buf
);
576 ret
= e
->set(indio_dev
, chan
, ret
);
577 return ret
? ret
: len
;
579 EXPORT_SYMBOL_GPL(iio_enum_write
);
581 static const struct iio_mount_matrix iio_mount_idmatrix
= {
589 static int iio_setup_mount_idmatrix(const struct device
*dev
,
590 struct iio_mount_matrix
*matrix
)
592 *matrix
= iio_mount_idmatrix
;
593 dev_info(dev
, "mounting matrix not found: using identity...\n");
597 ssize_t
iio_show_mount_matrix(struct iio_dev
*indio_dev
, uintptr_t priv
,
598 const struct iio_chan_spec
*chan
, char *buf
)
600 const struct iio_mount_matrix
*mtx
= ((iio_get_mount_matrix_t
*)
601 priv
)(indio_dev
, chan
);
607 mtx
= &iio_mount_idmatrix
;
609 return sysfs_emit(buf
, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
610 mtx
->rotation
[0], mtx
->rotation
[1], mtx
->rotation
[2],
611 mtx
->rotation
[3], mtx
->rotation
[4], mtx
->rotation
[5],
612 mtx
->rotation
[6], mtx
->rotation
[7], mtx
->rotation
[8]);
614 EXPORT_SYMBOL_GPL(iio_show_mount_matrix
);
617 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
618 * device "mount-matrix" property
619 * @dev: device the mounting matrix property is assigned to
620 * @matrix: where to store retrieved matrix
622 * If device is assigned no mounting matrix property, a default 3x3 identity
623 * matrix will be filled in.
625 * Return: 0 if success, or a negative error code on failure.
627 int iio_read_mount_matrix(struct device
*dev
, struct iio_mount_matrix
*matrix
)
629 size_t len
= ARRAY_SIZE(iio_mount_idmatrix
.rotation
);
632 err
= device_property_read_string_array(dev
, "mount-matrix", matrix
->rotation
, len
);
637 /* Invalid number of matrix entries. */
641 /* Invalid matrix declaration format. */
644 /* Matrix was not declared at all: fallback to identity. */
645 return iio_setup_mount_idmatrix(dev
, matrix
);
647 EXPORT_SYMBOL(iio_read_mount_matrix
);
649 static ssize_t
__iio_format_value(char *buf
, size_t offset
, unsigned int type
,
650 int size
, const int *vals
)
654 bool scale_db
= false;
658 return sysfs_emit_at(buf
, offset
, "%d", vals
[0]);
659 case IIO_VAL_INT_PLUS_MICRO_DB
:
662 case IIO_VAL_INT_PLUS_MICRO
:
664 return sysfs_emit_at(buf
, offset
, "-%d.%06u%s",
665 abs(vals
[0]), -vals
[1],
666 scale_db
? " dB" : "");
668 return sysfs_emit_at(buf
, offset
, "%d.%06u%s", vals
[0],
669 vals
[1], scale_db
? " dB" : "");
670 case IIO_VAL_INT_PLUS_NANO
:
672 return sysfs_emit_at(buf
, offset
, "-%d.%09u",
673 abs(vals
[0]), -vals
[1]);
675 return sysfs_emit_at(buf
, offset
, "%d.%09u", vals
[0],
677 case IIO_VAL_FRACTIONAL
:
678 tmp2
= div_s64((s64
)vals
[0] * 1000000000LL, vals
[1]);
680 tmp0
= (int)div_s64_rem(tmp2
, 1000000000, &tmp1
);
681 if ((tmp2
< 0) && (tmp0
== 0))
682 return sysfs_emit_at(buf
, offset
, "-0.%09u", abs(tmp1
));
684 return sysfs_emit_at(buf
, offset
, "%d.%09u", tmp0
,
686 case IIO_VAL_FRACTIONAL_LOG2
:
687 tmp2
= shift_right((s64
)vals
[0] * 1000000000LL, vals
[1]);
688 tmp0
= (int)div_s64_rem(tmp2
, 1000000000LL, &tmp1
);
689 if (tmp0
== 0 && tmp2
< 0)
690 return sysfs_emit_at(buf
, offset
, "-0.%09u", abs(tmp1
));
692 return sysfs_emit_at(buf
, offset
, "%d.%09u", tmp0
,
694 case IIO_VAL_INT_MULTIPLE
:
699 for (i
= 0; i
< size
; ++i
)
700 l
+= sysfs_emit_at(buf
, offset
+ l
, "%d ", vals
[i
]);
704 return sysfs_emit_at(buf
, offset
, "%c", (char)vals
[0]);
711 * iio_format_value() - Formats a IIO value into its string representation
712 * @buf: The buffer to which the formatted value gets written
713 * which is assumed to be big enough (i.e. PAGE_SIZE).
714 * @type: One of the IIO_VAL_* constants. This decides how the val
715 * and val2 parameters are formatted.
716 * @size: Number of IIO value entries contained in vals
717 * @vals: Pointer to the values, exact meaning depends on the
720 * Return: 0 by default, a negative number on failure or the
721 * total number of characters written for a type that belongs
722 * to the IIO_VAL_* constant.
724 ssize_t
iio_format_value(char *buf
, unsigned int type
, int size
, int *vals
)
728 len
= __iio_format_value(buf
, 0, type
, size
, vals
);
729 if (len
>= PAGE_SIZE
- 1)
732 return len
+ sysfs_emit_at(buf
, len
, "\n");
734 EXPORT_SYMBOL_GPL(iio_format_value
);
736 static ssize_t
iio_read_channel_label(struct device
*dev
,
737 struct device_attribute
*attr
,
740 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
741 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
743 if (indio_dev
->info
->read_label
)
744 return indio_dev
->info
->read_label(indio_dev
, this_attr
->c
, buf
);
746 if (this_attr
->c
->extend_name
)
747 return sprintf(buf
, "%s\n", this_attr
->c
->extend_name
);
752 static ssize_t
iio_read_channel_info(struct device
*dev
,
753 struct device_attribute
*attr
,
756 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
757 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
758 int vals
[INDIO_MAX_RAW_ELEMENTS
];
762 if (indio_dev
->info
->read_raw_multi
)
763 ret
= indio_dev
->info
->read_raw_multi(indio_dev
, this_attr
->c
,
764 INDIO_MAX_RAW_ELEMENTS
,
768 ret
= indio_dev
->info
->read_raw(indio_dev
, this_attr
->c
,
769 &vals
[0], &vals
[1], this_attr
->address
);
774 return iio_format_value(buf
, ret
, val_len
, vals
);
777 static ssize_t
iio_format_list(char *buf
, const int *vals
, int type
, int length
,
778 const char *prefix
, const char *suffix
)
793 len
= sysfs_emit(buf
, prefix
);
795 for (i
= 0; i
<= length
- stride
; i
+= stride
) {
797 len
+= sysfs_emit_at(buf
, len
, " ");
798 if (len
>= PAGE_SIZE
)
802 len
+= __iio_format_value(buf
, len
, type
, stride
, &vals
[i
]);
803 if (len
>= PAGE_SIZE
)
807 len
+= sysfs_emit_at(buf
, len
, "%s\n", suffix
);
812 static ssize_t
iio_format_avail_list(char *buf
, const int *vals
,
813 int type
, int length
)
816 return iio_format_list(buf
, vals
, type
, length
, "", "");
819 static ssize_t
iio_format_avail_range(char *buf
, const int *vals
, int type
)
821 return iio_format_list(buf
, vals
, type
, 3, "[", "]");
824 static ssize_t
iio_read_channel_info_avail(struct device
*dev
,
825 struct device_attribute
*attr
,
828 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
829 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
835 ret
= indio_dev
->info
->read_avail(indio_dev
, this_attr
->c
,
836 &vals
, &type
, &length
,
843 return iio_format_avail_list(buf
, vals
, type
, length
);
844 case IIO_AVAIL_RANGE
:
845 return iio_format_avail_range(buf
, vals
, type
);
852 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
853 * @str: The string to parse
854 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
855 * @integer: The integer part of the number
856 * @fract: The fractional part of the number
857 * @scale_db: True if this should parse as dB
859 * Returns 0 on success, or a negative error code if the string could not be
862 static int __iio_str_to_fixpoint(const char *str
, int fract_mult
,
863 int *integer
, int *fract
, bool scale_db
)
866 bool integer_part
= true, negative
= false;
868 if (fract_mult
== 0) {
871 return kstrtoint(str
, 0, integer
);
877 } else if (str
[0] == '+') {
882 if ('0' <= *str
&& *str
<= '9') {
884 i
= i
* 10 + *str
- '0';
886 f
+= fract_mult
* (*str
- '0');
889 } else if (*str
== '\n') {
890 if (*(str
+ 1) == '\0')
894 } else if (!strncmp(str
, " dB", sizeof(" dB") - 1) && scale_db
) {
895 /* Ignore the dB suffix */
896 str
+= sizeof(" dB") - 1;
898 } else if (!strncmp(str
, "dB", sizeof("dB") - 1) && scale_db
) {
899 /* Ignore the dB suffix */
900 str
+= sizeof("dB") - 1;
902 } else if (*str
== '.' && integer_part
) {
903 integer_part
= false;
924 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
925 * @str: The string to parse
926 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
927 * @integer: The integer part of the number
928 * @fract: The fractional part of the number
930 * Returns 0 on success, or a negative error code if the string could not be
933 int iio_str_to_fixpoint(const char *str
, int fract_mult
,
934 int *integer
, int *fract
)
936 return __iio_str_to_fixpoint(str
, fract_mult
, integer
, fract
, false);
938 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint
);
940 static ssize_t
iio_write_channel_info(struct device
*dev
,
941 struct device_attribute
*attr
,
945 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
946 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
947 int ret
, fract_mult
= 100000;
948 int integer
, fract
= 0;
949 bool is_char
= false;
950 bool scale_db
= false;
952 /* Assumes decimal - precision based on number of digits */
953 if (!indio_dev
->info
->write_raw
)
956 if (indio_dev
->info
->write_raw_get_fmt
)
957 switch (indio_dev
->info
->write_raw_get_fmt(indio_dev
,
958 this_attr
->c
, this_attr
->address
)) {
962 case IIO_VAL_INT_PLUS_MICRO_DB
:
965 case IIO_VAL_INT_PLUS_MICRO
:
968 case IIO_VAL_INT_PLUS_NANO
:
969 fract_mult
= 100000000;
981 if (sscanf(buf
, "%c", &ch
) != 1)
985 ret
= __iio_str_to_fixpoint(buf
, fract_mult
, &integer
, &fract
,
991 ret
= indio_dev
->info
->write_raw(indio_dev
, this_attr
->c
,
992 integer
, fract
, this_attr
->address
);
1000 int __iio_device_attr_init(struct device_attribute
*dev_attr
,
1001 const char *postfix
,
1002 struct iio_chan_spec
const *chan
,
1003 ssize_t (*readfunc
)(struct device
*dev
,
1004 struct device_attribute
*attr
,
1006 ssize_t (*writefunc
)(struct device
*dev
,
1007 struct device_attribute
*attr
,
1010 enum iio_shared_by shared_by
)
1015 sysfs_attr_init(&dev_attr
->attr
);
1017 /* Build up postfix of <extend_name>_<modifier>_postfix */
1018 if (chan
->modified
&& (shared_by
== IIO_SEPARATE
)) {
1019 if (chan
->extend_name
)
1020 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s_%s",
1021 iio_modifier_names
[chan
1026 full_postfix
= kasprintf(GFP_KERNEL
, "%s_%s",
1027 iio_modifier_names
[chan
1031 if (chan
->extend_name
== NULL
|| shared_by
!= IIO_SEPARATE
)
1032 full_postfix
= kstrdup(postfix
, GFP_KERNEL
);
1034 full_postfix
= kasprintf(GFP_KERNEL
,
1039 if (full_postfix
== NULL
)
1042 if (chan
->differential
) { /* Differential can not have modifier */
1043 switch (shared_by
) {
1044 case IIO_SHARED_BY_ALL
:
1045 name
= kasprintf(GFP_KERNEL
, "%s", full_postfix
);
1047 case IIO_SHARED_BY_DIR
:
1048 name
= kasprintf(GFP_KERNEL
, "%s_%s",
1049 iio_direction
[chan
->output
],
1052 case IIO_SHARED_BY_TYPE
:
1053 name
= kasprintf(GFP_KERNEL
, "%s_%s-%s_%s",
1054 iio_direction
[chan
->output
],
1055 iio_chan_type_name_spec
[chan
->type
],
1056 iio_chan_type_name_spec
[chan
->type
],
1060 if (!chan
->indexed
) {
1061 WARN(1, "Differential channels must be indexed\n");
1063 goto error_free_full_postfix
;
1065 name
= kasprintf(GFP_KERNEL
,
1067 iio_direction
[chan
->output
],
1068 iio_chan_type_name_spec
[chan
->type
],
1070 iio_chan_type_name_spec
[chan
->type
],
1075 } else { /* Single ended */
1076 switch (shared_by
) {
1077 case IIO_SHARED_BY_ALL
:
1078 name
= kasprintf(GFP_KERNEL
, "%s", full_postfix
);
1080 case IIO_SHARED_BY_DIR
:
1081 name
= kasprintf(GFP_KERNEL
, "%s_%s",
1082 iio_direction
[chan
->output
],
1085 case IIO_SHARED_BY_TYPE
:
1086 name
= kasprintf(GFP_KERNEL
, "%s_%s_%s",
1087 iio_direction
[chan
->output
],
1088 iio_chan_type_name_spec
[chan
->type
],
1094 name
= kasprintf(GFP_KERNEL
, "%s_%s%d_%s",
1095 iio_direction
[chan
->output
],
1096 iio_chan_type_name_spec
[chan
->type
],
1100 name
= kasprintf(GFP_KERNEL
, "%s_%s_%s",
1101 iio_direction
[chan
->output
],
1102 iio_chan_type_name_spec
[chan
->type
],
1109 goto error_free_full_postfix
;
1111 dev_attr
->attr
.name
= name
;
1114 dev_attr
->attr
.mode
|= S_IRUGO
;
1115 dev_attr
->show
= readfunc
;
1119 dev_attr
->attr
.mode
|= S_IWUSR
;
1120 dev_attr
->store
= writefunc
;
1123 error_free_full_postfix
:
1124 kfree(full_postfix
);
1129 static void __iio_device_attr_deinit(struct device_attribute
*dev_attr
)
1131 kfree(dev_attr
->attr
.name
);
1134 int __iio_add_chan_devattr(const char *postfix
,
1135 struct iio_chan_spec
const *chan
,
1136 ssize_t (*readfunc
)(struct device
*dev
,
1137 struct device_attribute
*attr
,
1139 ssize_t (*writefunc
)(struct device
*dev
,
1140 struct device_attribute
*attr
,
1144 enum iio_shared_by shared_by
,
1146 struct iio_buffer
*buffer
,
1147 struct list_head
*attr_list
)
1150 struct iio_dev_attr
*iio_attr
, *t
;
1152 iio_attr
= kzalloc(sizeof(*iio_attr
), GFP_KERNEL
);
1153 if (iio_attr
== NULL
)
1155 ret
= __iio_device_attr_init(&iio_attr
->dev_attr
,
1157 readfunc
, writefunc
, shared_by
);
1159 goto error_iio_dev_attr_free
;
1161 iio_attr
->address
= mask
;
1162 iio_attr
->buffer
= buffer
;
1163 list_for_each_entry(t
, attr_list
, l
)
1164 if (strcmp(t
->dev_attr
.attr
.name
,
1165 iio_attr
->dev_attr
.attr
.name
) == 0) {
1166 if (shared_by
== IIO_SEPARATE
)
1167 dev_err(dev
, "tried to double register : %s\n",
1168 t
->dev_attr
.attr
.name
);
1170 goto error_device_attr_deinit
;
1172 list_add(&iio_attr
->l
, attr_list
);
1176 error_device_attr_deinit
:
1177 __iio_device_attr_deinit(&iio_attr
->dev_attr
);
1178 error_iio_dev_attr_free
:
1183 static int iio_device_add_channel_label(struct iio_dev
*indio_dev
,
1184 struct iio_chan_spec
const *chan
)
1186 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1189 if (!indio_dev
->info
->read_label
&& !chan
->extend_name
)
1192 ret
= __iio_add_chan_devattr("label",
1194 &iio_read_channel_label
,
1200 &iio_dev_opaque
->channel_attr_list
);
1207 static int iio_device_add_info_mask_type(struct iio_dev
*indio_dev
,
1208 struct iio_chan_spec
const *chan
,
1209 enum iio_shared_by shared_by
,
1210 const long *infomask
)
1212 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1213 int i
, ret
, attrcount
= 0;
1215 for_each_set_bit(i
, infomask
, sizeof(*infomask
)*8) {
1216 if (i
>= ARRAY_SIZE(iio_chan_info_postfix
))
1218 ret
= __iio_add_chan_devattr(iio_chan_info_postfix
[i
],
1220 &iio_read_channel_info
,
1221 &iio_write_channel_info
,
1226 &iio_dev_opaque
->channel_attr_list
);
1227 if ((ret
== -EBUSY
) && (shared_by
!= IIO_SEPARATE
))
1237 static int iio_device_add_info_mask_type_avail(struct iio_dev
*indio_dev
,
1238 struct iio_chan_spec
const *chan
,
1239 enum iio_shared_by shared_by
,
1240 const long *infomask
)
1242 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1243 int i
, ret
, attrcount
= 0;
1244 char *avail_postfix
;
1246 for_each_set_bit(i
, infomask
, sizeof(*infomask
) * 8) {
1247 if (i
>= ARRAY_SIZE(iio_chan_info_postfix
))
1249 avail_postfix
= kasprintf(GFP_KERNEL
,
1251 iio_chan_info_postfix
[i
]);
1255 ret
= __iio_add_chan_devattr(avail_postfix
,
1257 &iio_read_channel_info_avail
,
1263 &iio_dev_opaque
->channel_attr_list
);
1264 kfree(avail_postfix
);
1265 if ((ret
== -EBUSY
) && (shared_by
!= IIO_SEPARATE
))
1275 static int iio_device_add_channel_sysfs(struct iio_dev
*indio_dev
,
1276 struct iio_chan_spec
const *chan
)
1278 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1279 int ret
, attrcount
= 0;
1280 const struct iio_chan_spec_ext_info
*ext_info
;
1282 if (chan
->channel
< 0)
1284 ret
= iio_device_add_info_mask_type(indio_dev
, chan
,
1286 &chan
->info_mask_separate
);
1291 ret
= iio_device_add_info_mask_type_avail(indio_dev
, chan
,
1294 info_mask_separate_available
);
1299 ret
= iio_device_add_info_mask_type(indio_dev
, chan
,
1301 &chan
->info_mask_shared_by_type
);
1306 ret
= iio_device_add_info_mask_type_avail(indio_dev
, chan
,
1309 info_mask_shared_by_type_available
);
1314 ret
= iio_device_add_info_mask_type(indio_dev
, chan
,
1316 &chan
->info_mask_shared_by_dir
);
1321 ret
= iio_device_add_info_mask_type_avail(indio_dev
, chan
,
1323 &chan
->info_mask_shared_by_dir_available
);
1328 ret
= iio_device_add_info_mask_type(indio_dev
, chan
,
1330 &chan
->info_mask_shared_by_all
);
1335 ret
= iio_device_add_info_mask_type_avail(indio_dev
, chan
,
1337 &chan
->info_mask_shared_by_all_available
);
1342 ret
= iio_device_add_channel_label(indio_dev
, chan
);
1347 if (chan
->ext_info
) {
1349 for (ext_info
= chan
->ext_info
; ext_info
->name
; ext_info
++) {
1350 ret
= __iio_add_chan_devattr(ext_info
->name
,
1353 &iio_read_channel_ext_info
: NULL
,
1355 &iio_write_channel_ext_info
: NULL
,
1360 &iio_dev_opaque
->channel_attr_list
);
1362 if (ret
== -EBUSY
&& ext_info
->shared
)
1376 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1377 * @attr_list: List of IIO device attributes
1379 * This function frees the memory allocated for each of the IIO device
1380 * attributes in the list.
1382 void iio_free_chan_devattr_list(struct list_head
*attr_list
)
1384 struct iio_dev_attr
*p
, *n
;
1386 list_for_each_entry_safe(p
, n
, attr_list
, l
) {
1387 kfree_const(p
->dev_attr
.attr
.name
);
1393 static ssize_t
iio_show_dev_name(struct device
*dev
,
1394 struct device_attribute
*attr
,
1397 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
1398 return sysfs_emit(buf
, "%s\n", indio_dev
->name
);
1401 static DEVICE_ATTR(name
, S_IRUGO
, iio_show_dev_name
, NULL
);
1403 static ssize_t
iio_show_dev_label(struct device
*dev
,
1404 struct device_attribute
*attr
,
1407 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
1408 return sysfs_emit(buf
, "%s\n", indio_dev
->label
);
1411 static DEVICE_ATTR(label
, S_IRUGO
, iio_show_dev_label
, NULL
);
1413 static ssize_t
iio_show_timestamp_clock(struct device
*dev
,
1414 struct device_attribute
*attr
,
1417 const struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
1418 const clockid_t clk
= iio_device_get_clock(indio_dev
);
1423 case CLOCK_REALTIME
:
1424 name
= "realtime\n";
1425 sz
= sizeof("realtime\n");
1427 case CLOCK_MONOTONIC
:
1428 name
= "monotonic\n";
1429 sz
= sizeof("monotonic\n");
1431 case CLOCK_MONOTONIC_RAW
:
1432 name
= "monotonic_raw\n";
1433 sz
= sizeof("monotonic_raw\n");
1435 case CLOCK_REALTIME_COARSE
:
1436 name
= "realtime_coarse\n";
1437 sz
= sizeof("realtime_coarse\n");
1439 case CLOCK_MONOTONIC_COARSE
:
1440 name
= "monotonic_coarse\n";
1441 sz
= sizeof("monotonic_coarse\n");
1443 case CLOCK_BOOTTIME
:
1444 name
= "boottime\n";
1445 sz
= sizeof("boottime\n");
1449 sz
= sizeof("tai\n");
1455 memcpy(buf
, name
, sz
);
1459 static ssize_t
iio_store_timestamp_clock(struct device
*dev
,
1460 struct device_attribute
*attr
,
1461 const char *buf
, size_t len
)
1466 if (sysfs_streq(buf
, "realtime"))
1467 clk
= CLOCK_REALTIME
;
1468 else if (sysfs_streq(buf
, "monotonic"))
1469 clk
= CLOCK_MONOTONIC
;
1470 else if (sysfs_streq(buf
, "monotonic_raw"))
1471 clk
= CLOCK_MONOTONIC_RAW
;
1472 else if (sysfs_streq(buf
, "realtime_coarse"))
1473 clk
= CLOCK_REALTIME_COARSE
;
1474 else if (sysfs_streq(buf
, "monotonic_coarse"))
1475 clk
= CLOCK_MONOTONIC_COARSE
;
1476 else if (sysfs_streq(buf
, "boottime"))
1477 clk
= CLOCK_BOOTTIME
;
1478 else if (sysfs_streq(buf
, "tai"))
1483 ret
= iio_device_set_clock(dev_to_iio_dev(dev
), clk
);
1490 int iio_device_register_sysfs_group(struct iio_dev
*indio_dev
,
1491 const struct attribute_group
*group
)
1493 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1494 const struct attribute_group
**new, **old
= iio_dev_opaque
->groups
;
1495 unsigned int cnt
= iio_dev_opaque
->groupcounter
;
1497 new = krealloc(old
, sizeof(*new) * (cnt
+ 2), GFP_KERNEL
);
1501 new[iio_dev_opaque
->groupcounter
++] = group
;
1502 new[iio_dev_opaque
->groupcounter
] = NULL
;
1504 iio_dev_opaque
->groups
= new;
1509 static DEVICE_ATTR(current_timestamp_clock
, S_IRUGO
| S_IWUSR
,
1510 iio_show_timestamp_clock
, iio_store_timestamp_clock
);
1512 static int iio_device_register_sysfs(struct iio_dev
*indio_dev
)
1514 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1515 int i
, ret
= 0, attrcount
, attrn
, attrcount_orig
= 0;
1516 struct iio_dev_attr
*p
;
1517 struct attribute
**attr
, *clk
= NULL
;
1519 /* First count elements in any existing group */
1520 if (indio_dev
->info
->attrs
) {
1521 attr
= indio_dev
->info
->attrs
->attrs
;
1522 while (*attr
++ != NULL
)
1525 attrcount
= attrcount_orig
;
1527 * New channel registration method - relies on the fact a group does
1528 * not need to be initialized if its name is NULL.
1530 if (indio_dev
->channels
)
1531 for (i
= 0; i
< indio_dev
->num_channels
; i
++) {
1532 const struct iio_chan_spec
*chan
=
1533 &indio_dev
->channels
[i
];
1535 if (chan
->type
== IIO_TIMESTAMP
)
1536 clk
= &dev_attr_current_timestamp_clock
.attr
;
1538 ret
= iio_device_add_channel_sysfs(indio_dev
, chan
);
1540 goto error_clear_attrs
;
1544 if (iio_dev_opaque
->event_interface
)
1545 clk
= &dev_attr_current_timestamp_clock
.attr
;
1547 if (indio_dev
->name
)
1549 if (indio_dev
->label
)
1554 iio_dev_opaque
->chan_attr_group
.attrs
=
1555 kcalloc(attrcount
+ 1,
1556 sizeof(iio_dev_opaque
->chan_attr_group
.attrs
[0]),
1558 if (iio_dev_opaque
->chan_attr_group
.attrs
== NULL
) {
1560 goto error_clear_attrs
;
1562 /* Copy across original attributes */
1563 if (indio_dev
->info
->attrs
) {
1564 memcpy(iio_dev_opaque
->chan_attr_group
.attrs
,
1565 indio_dev
->info
->attrs
->attrs
,
1566 sizeof(iio_dev_opaque
->chan_attr_group
.attrs
[0])
1568 iio_dev_opaque
->chan_attr_group
.is_visible
=
1569 indio_dev
->info
->attrs
->is_visible
;
1571 attrn
= attrcount_orig
;
1572 /* Add all elements from the list. */
1573 list_for_each_entry(p
, &iio_dev_opaque
->channel_attr_list
, l
)
1574 iio_dev_opaque
->chan_attr_group
.attrs
[attrn
++] = &p
->dev_attr
.attr
;
1575 if (indio_dev
->name
)
1576 iio_dev_opaque
->chan_attr_group
.attrs
[attrn
++] = &dev_attr_name
.attr
;
1577 if (indio_dev
->label
)
1578 iio_dev_opaque
->chan_attr_group
.attrs
[attrn
++] = &dev_attr_label
.attr
;
1580 iio_dev_opaque
->chan_attr_group
.attrs
[attrn
++] = clk
;
1582 ret
= iio_device_register_sysfs_group(indio_dev
,
1583 &iio_dev_opaque
->chan_attr_group
);
1585 goto error_clear_attrs
;
1590 iio_free_chan_devattr_list(&iio_dev_opaque
->channel_attr_list
);
1595 static void iio_device_unregister_sysfs(struct iio_dev
*indio_dev
)
1597 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1599 iio_free_chan_devattr_list(&iio_dev_opaque
->channel_attr_list
);
1600 kfree(iio_dev_opaque
->chan_attr_group
.attrs
);
1601 iio_dev_opaque
->chan_attr_group
.attrs
= NULL
;
1602 kfree(iio_dev_opaque
->groups
);
1605 static void iio_dev_release(struct device
*device
)
1607 struct iio_dev
*indio_dev
= dev_to_iio_dev(device
);
1608 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1610 if (indio_dev
->modes
& INDIO_ALL_TRIGGERED_MODES
)
1611 iio_device_unregister_trigger_consumer(indio_dev
);
1612 iio_device_unregister_eventset(indio_dev
);
1613 iio_device_unregister_sysfs(indio_dev
);
1615 iio_device_detach_buffers(indio_dev
);
1617 ida_simple_remove(&iio_ida
, iio_dev_opaque
->id
);
1618 kfree(iio_dev_opaque
);
1621 struct device_type iio_device_type
= {
1622 .name
= "iio_device",
1623 .release
= iio_dev_release
,
1627 * iio_device_alloc() - allocate an iio_dev from a driver
1628 * @parent: Parent device.
1629 * @sizeof_priv: Space to allocate for private structure.
1631 struct iio_dev
*iio_device_alloc(struct device
*parent
, int sizeof_priv
)
1633 struct iio_dev_opaque
*iio_dev_opaque
;
1634 struct iio_dev
*indio_dev
;
1637 alloc_size
= sizeof(struct iio_dev_opaque
);
1639 alloc_size
= ALIGN(alloc_size
, IIO_ALIGN
);
1640 alloc_size
+= sizeof_priv
;
1643 iio_dev_opaque
= kzalloc(alloc_size
, GFP_KERNEL
);
1644 if (!iio_dev_opaque
)
1647 indio_dev
= &iio_dev_opaque
->indio_dev
;
1648 indio_dev
->priv
= (char *)iio_dev_opaque
+
1649 ALIGN(sizeof(struct iio_dev_opaque
), IIO_ALIGN
);
1651 indio_dev
->dev
.parent
= parent
;
1652 indio_dev
->dev
.type
= &iio_device_type
;
1653 indio_dev
->dev
.bus
= &iio_bus_type
;
1654 device_initialize(&indio_dev
->dev
);
1655 iio_device_set_drvdata(indio_dev
, (void *)indio_dev
);
1656 mutex_init(&indio_dev
->mlock
);
1657 mutex_init(&iio_dev_opaque
->info_exist_lock
);
1658 INIT_LIST_HEAD(&iio_dev_opaque
->channel_attr_list
);
1660 iio_dev_opaque
->id
= ida_simple_get(&iio_ida
, 0, 0, GFP_KERNEL
);
1661 if (iio_dev_opaque
->id
< 0) {
1662 /* cannot use a dev_err as the name isn't available */
1663 pr_err("failed to get device id\n");
1664 kfree(iio_dev_opaque
);
1667 dev_set_name(&indio_dev
->dev
, "iio:device%d", iio_dev_opaque
->id
);
1668 INIT_LIST_HEAD(&iio_dev_opaque
->buffer_list
);
1669 INIT_LIST_HEAD(&iio_dev_opaque
->ioctl_handlers
);
1673 EXPORT_SYMBOL(iio_device_alloc
);
1676 * iio_device_free() - free an iio_dev from a driver
1677 * @dev: the iio_dev associated with the device
1679 void iio_device_free(struct iio_dev
*dev
)
1682 put_device(&dev
->dev
);
1684 EXPORT_SYMBOL(iio_device_free
);
1686 static void devm_iio_device_release(void *iio_dev
)
1688 iio_device_free(iio_dev
);
1692 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1693 * @parent: Device to allocate iio_dev for, and parent for this IIO device
1694 * @sizeof_priv: Space to allocate for private structure.
1696 * Managed iio_device_alloc. iio_dev allocated with this function is
1697 * automatically freed on driver detach.
1700 * Pointer to allocated iio_dev on success, NULL on failure.
1702 struct iio_dev
*devm_iio_device_alloc(struct device
*parent
, int sizeof_priv
)
1704 struct iio_dev
*iio_dev
;
1707 iio_dev
= iio_device_alloc(parent
, sizeof_priv
);
1711 ret
= devm_add_action_or_reset(parent
, devm_iio_device_release
,
1718 EXPORT_SYMBOL_GPL(devm_iio_device_alloc
);
1721 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1722 * @inode: Inode structure for identifying the device in the file system
1723 * @filp: File structure for iio device used to keep and later access
1726 * Return: 0 on success or -EBUSY if the device is already opened
1728 static int iio_chrdev_open(struct inode
*inode
, struct file
*filp
)
1730 struct iio_dev_opaque
*iio_dev_opaque
=
1731 container_of(inode
->i_cdev
, struct iio_dev_opaque
, chrdev
);
1732 struct iio_dev
*indio_dev
= &iio_dev_opaque
->indio_dev
;
1733 struct iio_dev_buffer_pair
*ib
;
1735 if (test_and_set_bit(IIO_BUSY_BIT_POS
, &iio_dev_opaque
->flags
))
1738 iio_device_get(indio_dev
);
1740 ib
= kmalloc(sizeof(*ib
), GFP_KERNEL
);
1742 iio_device_put(indio_dev
);
1743 clear_bit(IIO_BUSY_BIT_POS
, &iio_dev_opaque
->flags
);
1747 ib
->indio_dev
= indio_dev
;
1748 ib
->buffer
= indio_dev
->buffer
;
1750 filp
->private_data
= ib
;
1756 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1757 * @inode: Inode structure pointer for the char device
1758 * @filp: File structure pointer for the char device
1760 * Return: 0 for successful release
1762 static int iio_chrdev_release(struct inode
*inode
, struct file
*filp
)
1764 struct iio_dev_buffer_pair
*ib
= filp
->private_data
;
1765 struct iio_dev_opaque
*iio_dev_opaque
=
1766 container_of(inode
->i_cdev
, struct iio_dev_opaque
, chrdev
);
1767 struct iio_dev
*indio_dev
= &iio_dev_opaque
->indio_dev
;
1769 clear_bit(IIO_BUSY_BIT_POS
, &iio_dev_opaque
->flags
);
1770 iio_device_put(indio_dev
);
1775 void iio_device_ioctl_handler_register(struct iio_dev
*indio_dev
,
1776 struct iio_ioctl_handler
*h
)
1778 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1780 list_add_tail(&h
->entry
, &iio_dev_opaque
->ioctl_handlers
);
1783 void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler
*h
)
1785 list_del(&h
->entry
);
1788 static long iio_ioctl(struct file
*filp
, unsigned int cmd
, unsigned long arg
)
1790 struct iio_dev_buffer_pair
*ib
= filp
->private_data
;
1791 struct iio_dev
*indio_dev
= ib
->indio_dev
;
1792 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1793 struct iio_ioctl_handler
*h
;
1796 mutex_lock(&iio_dev_opaque
->info_exist_lock
);
1799 * The NULL check here is required to prevent crashing when a device
1800 * is being removed while userspace would still have open file handles
1801 * to try to access this device.
1803 if (!indio_dev
->info
)
1806 list_for_each_entry(h
, &iio_dev_opaque
->ioctl_handlers
, entry
) {
1807 ret
= h
->ioctl(indio_dev
, filp
, cmd
, arg
);
1808 if (ret
!= IIO_IOCTL_UNHANDLED
)
1812 if (ret
== IIO_IOCTL_UNHANDLED
)
1816 mutex_unlock(&iio_dev_opaque
->info_exist_lock
);
1821 static const struct file_operations iio_buffer_fileops
= {
1822 .owner
= THIS_MODULE
,
1823 .llseek
= noop_llseek
,
1824 .read
= iio_buffer_read_outer_addr
,
1825 .poll
= iio_buffer_poll_addr
,
1826 .unlocked_ioctl
= iio_ioctl
,
1827 .compat_ioctl
= compat_ptr_ioctl
,
1828 .open
= iio_chrdev_open
,
1829 .release
= iio_chrdev_release
,
1832 static const struct file_operations iio_event_fileops
= {
1833 .owner
= THIS_MODULE
,
1834 .llseek
= noop_llseek
,
1835 .unlocked_ioctl
= iio_ioctl
,
1836 .compat_ioctl
= compat_ptr_ioctl
,
1837 .open
= iio_chrdev_open
,
1838 .release
= iio_chrdev_release
,
1841 static int iio_check_unique_scan_index(struct iio_dev
*indio_dev
)
1844 const struct iio_chan_spec
*channels
= indio_dev
->channels
;
1846 if (!(indio_dev
->modes
& INDIO_ALL_BUFFER_MODES
))
1849 for (i
= 0; i
< indio_dev
->num_channels
- 1; i
++) {
1850 if (channels
[i
].scan_index
< 0)
1852 for (j
= i
+ 1; j
< indio_dev
->num_channels
; j
++)
1853 if (channels
[i
].scan_index
== channels
[j
].scan_index
) {
1854 dev_err(&indio_dev
->dev
,
1855 "Duplicate scan index %d\n",
1856 channels
[i
].scan_index
);
1864 static int iio_check_extended_name(const struct iio_dev
*indio_dev
)
1868 if (!indio_dev
->info
->read_label
)
1871 for (i
= 0; i
< indio_dev
->num_channels
; i
++) {
1872 if (indio_dev
->channels
[i
].extend_name
) {
1873 dev_err(&indio_dev
->dev
,
1874 "Cannot use labels and extend_name at the same time\n");
1882 static const struct iio_buffer_setup_ops noop_ring_setup_ops
;
1884 int __iio_device_register(struct iio_dev
*indio_dev
, struct module
*this_mod
)
1886 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1890 if (!indio_dev
->info
)
1893 iio_dev_opaque
->driver_module
= this_mod
;
1894 /* If the calling driver did not initialize of_node, do it here */
1895 if (!indio_dev
->dev
.of_node
&& indio_dev
->dev
.parent
)
1896 indio_dev
->dev
.of_node
= indio_dev
->dev
.parent
->of_node
;
1898 label
= of_get_property(indio_dev
->dev
.of_node
, "label", NULL
);
1900 indio_dev
->label
= label
;
1902 ret
= iio_check_unique_scan_index(indio_dev
);
1906 ret
= iio_check_extended_name(indio_dev
);
1910 iio_device_register_debugfs(indio_dev
);
1912 ret
= iio_buffers_alloc_sysfs_and_mask(indio_dev
);
1914 dev_err(indio_dev
->dev
.parent
,
1915 "Failed to create buffer sysfs interfaces\n");
1916 goto error_unreg_debugfs
;
1919 ret
= iio_device_register_sysfs(indio_dev
);
1921 dev_err(indio_dev
->dev
.parent
,
1922 "Failed to register sysfs interfaces\n");
1923 goto error_buffer_free_sysfs
;
1925 ret
= iio_device_register_eventset(indio_dev
);
1927 dev_err(indio_dev
->dev
.parent
,
1928 "Failed to register event set\n");
1929 goto error_free_sysfs
;
1931 if (indio_dev
->modes
& INDIO_ALL_TRIGGERED_MODES
)
1932 iio_device_register_trigger_consumer(indio_dev
);
1934 if ((indio_dev
->modes
& INDIO_ALL_BUFFER_MODES
) &&
1935 indio_dev
->setup_ops
== NULL
)
1936 indio_dev
->setup_ops
= &noop_ring_setup_ops
;
1938 if (iio_dev_opaque
->attached_buffers_cnt
)
1939 cdev_init(&iio_dev_opaque
->chrdev
, &iio_buffer_fileops
);
1940 else if (iio_dev_opaque
->event_interface
)
1941 cdev_init(&iio_dev_opaque
->chrdev
, &iio_event_fileops
);
1943 if (iio_dev_opaque
->attached_buffers_cnt
|| iio_dev_opaque
->event_interface
) {
1944 indio_dev
->dev
.devt
= MKDEV(MAJOR(iio_devt
), iio_dev_opaque
->id
);
1945 iio_dev_opaque
->chrdev
.owner
= this_mod
;
1948 /* assign device groups now; they should be all registered now */
1949 indio_dev
->dev
.groups
= iio_dev_opaque
->groups
;
1951 ret
= cdev_device_add(&iio_dev_opaque
->chrdev
, &indio_dev
->dev
);
1953 goto error_unreg_eventset
;
1957 error_unreg_eventset
:
1958 iio_device_unregister_eventset(indio_dev
);
1960 iio_device_unregister_sysfs(indio_dev
);
1961 error_buffer_free_sysfs
:
1962 iio_buffers_free_sysfs_and_mask(indio_dev
);
1963 error_unreg_debugfs
:
1964 iio_device_unregister_debugfs(indio_dev
);
1967 EXPORT_SYMBOL(__iio_device_register
);
1970 * iio_device_unregister() - unregister a device from the IIO subsystem
1971 * @indio_dev: Device structure representing the device.
1973 void iio_device_unregister(struct iio_dev
*indio_dev
)
1975 struct iio_dev_opaque
*iio_dev_opaque
= to_iio_dev_opaque(indio_dev
);
1977 cdev_device_del(&iio_dev_opaque
->chrdev
, &indio_dev
->dev
);
1979 mutex_lock(&iio_dev_opaque
->info_exist_lock
);
1981 iio_device_unregister_debugfs(indio_dev
);
1983 iio_disable_all_buffers(indio_dev
);
1985 indio_dev
->info
= NULL
;
1987 iio_device_wakeup_eventset(indio_dev
);
1988 iio_buffer_wakeup_poll(indio_dev
);
1990 mutex_unlock(&iio_dev_opaque
->info_exist_lock
);
1992 iio_buffers_free_sysfs_and_mask(indio_dev
);
1994 EXPORT_SYMBOL(iio_device_unregister
);
1996 static void devm_iio_device_unreg(void *indio_dev
)
1998 iio_device_unregister(indio_dev
);
2001 int __devm_iio_device_register(struct device
*dev
, struct iio_dev
*indio_dev
,
2002 struct module
*this_mod
)
2006 ret
= __iio_device_register(indio_dev
, this_mod
);
2010 return devm_add_action_or_reset(dev
, devm_iio_device_unreg
, indio_dev
);
2012 EXPORT_SYMBOL_GPL(__devm_iio_device_register
);
2015 * iio_device_claim_direct_mode - Keep device in direct mode
2016 * @indio_dev: the iio_dev associated with the device
2018 * If the device is in direct mode it is guaranteed to stay
2019 * that way until iio_device_release_direct_mode() is called.
2021 * Use with iio_device_release_direct_mode()
2023 * Returns: 0 on success, -EBUSY on failure
2025 int iio_device_claim_direct_mode(struct iio_dev
*indio_dev
)
2027 mutex_lock(&indio_dev
->mlock
);
2029 if (iio_buffer_enabled(indio_dev
)) {
2030 mutex_unlock(&indio_dev
->mlock
);
2035 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode
);
2038 * iio_device_release_direct_mode - releases claim on direct mode
2039 * @indio_dev: the iio_dev associated with the device
2041 * Release the claim. Device is no longer guaranteed to stay
2044 * Use with iio_device_claim_direct_mode()
2046 void iio_device_release_direct_mode(struct iio_dev
*indio_dev
)
2048 mutex_unlock(&indio_dev
->mlock
);
2050 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode
);
2052 subsys_initcall(iio_init
);
2053 module_exit(iio_exit
);
2055 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
2056 MODULE_DESCRIPTION("Industrial I/O core");
2057 MODULE_LICENSE("GPL");