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>
29 #include "iio_core_trigger.h"
30 #include <linux/iio/sysfs.h>
31 #include <linux/iio/events.h>
32 #include <linux/iio/buffer.h>
33 #include <linux/iio/buffer_impl.h>
35 /* IDA to assign each registered device a unique id */
36 static DEFINE_IDA(iio_ida);
38 static dev_t iio_devt;
40 #define IIO_DEV_MAX 256
41 struct bus_type iio_bus_type = {
44 EXPORT_SYMBOL(iio_bus_type);
46 static struct dentry *iio_debugfs_dentry;
48 static const char * const iio_direction[] = {
53 static const char * const iio_chan_type_name_spec[] = {
54 [IIO_VOLTAGE] = "voltage",
55 [IIO_CURRENT] = "current",
56 [IIO_POWER] = "power",
57 [IIO_ACCEL] = "accel",
58 [IIO_ANGL_VEL] = "anglvel",
60 [IIO_LIGHT] = "illuminance",
61 [IIO_INTENSITY] = "intensity",
62 [IIO_PROXIMITY] = "proximity",
64 [IIO_INCLI] = "incli",
67 [IIO_TIMESTAMP] = "timestamp",
68 [IIO_CAPACITANCE] = "capacitance",
69 [IIO_ALTVOLTAGE] = "altvoltage",
71 [IIO_PRESSURE] = "pressure",
72 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
73 [IIO_ACTIVITY] = "activity",
74 [IIO_STEPS] = "steps",
75 [IIO_ENERGY] = "energy",
76 [IIO_DISTANCE] = "distance",
77 [IIO_VELOCITY] = "velocity",
78 [IIO_CONCENTRATION] = "concentration",
79 [IIO_RESISTANCE] = "resistance",
81 [IIO_UVINDEX] = "uvindex",
82 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
83 [IIO_COUNT] = "count",
84 [IIO_INDEX] = "index",
85 [IIO_GRAVITY] = "gravity",
86 [IIO_POSITIONRELATIVE] = "positionrelative",
87 [IIO_PHASE] = "phase",
88 [IIO_MASSCONCENTRATION] = "massconcentration",
91 static const char * const iio_modifier_names[] = {
95 [IIO_MOD_X_AND_Y] = "x&y",
96 [IIO_MOD_X_AND_Z] = "x&z",
97 [IIO_MOD_Y_AND_Z] = "y&z",
98 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
99 [IIO_MOD_X_OR_Y] = "x|y",
100 [IIO_MOD_X_OR_Z] = "x|z",
101 [IIO_MOD_Y_OR_Z] = "y|z",
102 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
103 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
104 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
105 [IIO_MOD_LIGHT_BOTH] = "both",
106 [IIO_MOD_LIGHT_IR] = "ir",
107 [IIO_MOD_LIGHT_CLEAR] = "clear",
108 [IIO_MOD_LIGHT_RED] = "red",
109 [IIO_MOD_LIGHT_GREEN] = "green",
110 [IIO_MOD_LIGHT_BLUE] = "blue",
111 [IIO_MOD_LIGHT_UV] = "uv",
112 [IIO_MOD_LIGHT_DUV] = "duv",
113 [IIO_MOD_QUATERNION] = "quaternion",
114 [IIO_MOD_TEMP_AMBIENT] = "ambient",
115 [IIO_MOD_TEMP_OBJECT] = "object",
116 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
117 [IIO_MOD_NORTH_TRUE] = "from_north_true",
118 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
119 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
120 [IIO_MOD_RUNNING] = "running",
121 [IIO_MOD_JOGGING] = "jogging",
122 [IIO_MOD_WALKING] = "walking",
123 [IIO_MOD_STILL] = "still",
124 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
127 [IIO_MOD_CO2] = "co2",
128 [IIO_MOD_VOC] = "voc",
129 [IIO_MOD_PM1] = "pm1",
130 [IIO_MOD_PM2P5] = "pm2p5",
131 [IIO_MOD_PM4] = "pm4",
132 [IIO_MOD_PM10] = "pm10",
135 /* relies on pairs of these shared then separate */
136 static const char * const iio_chan_info_postfix[] = {
137 [IIO_CHAN_INFO_RAW] = "raw",
138 [IIO_CHAN_INFO_PROCESSED] = "input",
139 [IIO_CHAN_INFO_SCALE] = "scale",
140 [IIO_CHAN_INFO_OFFSET] = "offset",
141 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
142 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
143 [IIO_CHAN_INFO_PEAK] = "peak_raw",
144 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
145 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
146 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
147 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
148 = "filter_low_pass_3db_frequency",
149 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
150 = "filter_high_pass_3db_frequency",
151 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
152 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
153 [IIO_CHAN_INFO_PHASE] = "phase",
154 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
155 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
156 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
157 [IIO_CHAN_INFO_ENABLE] = "en",
158 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
159 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
160 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
161 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
162 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
163 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
164 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
168 * iio_find_channel_from_si() - get channel from its scan index
170 * @si: scan index to match
172 const struct iio_chan_spec
173 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
177 for (i = 0; i < indio_dev->num_channels; i++)
178 if (indio_dev->channels[i].scan_index == si)
179 return &indio_dev->channels[i];
183 /* This turns up an awful lot */
184 ssize_t iio_read_const_attr(struct device *dev,
185 struct device_attribute *attr,
188 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
190 EXPORT_SYMBOL(iio_read_const_attr);
192 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
195 const struct iio_event_interface *ev_int = indio_dev->event_interface;
197 ret = mutex_lock_interruptible(&indio_dev->mlock);
200 if ((ev_int && iio_event_enabled(ev_int)) ||
201 iio_buffer_enabled(indio_dev)) {
202 mutex_unlock(&indio_dev->mlock);
205 indio_dev->clock_id = clock_id;
206 mutex_unlock(&indio_dev->mlock);
212 * iio_get_time_ns() - utility function to get a time stamp for events etc
215 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
217 struct timespec64 tp;
219 switch (iio_device_get_clock(indio_dev)) {
221 return ktime_get_real_ns();
222 case CLOCK_MONOTONIC:
223 return ktime_get_ns();
224 case CLOCK_MONOTONIC_RAW:
225 return ktime_get_raw_ns();
226 case CLOCK_REALTIME_COARSE:
227 return ktime_to_ns(ktime_get_coarse_real());
228 case CLOCK_MONOTONIC_COARSE:
229 ktime_get_coarse_ts64(&tp);
230 return timespec64_to_ns(&tp);
232 return ktime_get_boottime_ns();
234 return ktime_get_clocktai_ns();
239 EXPORT_SYMBOL(iio_get_time_ns);
242 * iio_get_time_res() - utility function to get time stamp clock resolution in
246 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
248 switch (iio_device_get_clock(indio_dev)) {
250 case CLOCK_MONOTONIC:
251 case CLOCK_MONOTONIC_RAW:
254 return hrtimer_resolution;
255 case CLOCK_REALTIME_COARSE:
256 case CLOCK_MONOTONIC_COARSE:
262 EXPORT_SYMBOL(iio_get_time_res);
264 static int __init iio_init(void)
268 /* Register sysfs bus */
269 ret = bus_register(&iio_bus_type);
271 pr_err("could not register bus type\n");
275 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
277 pr_err("failed to allocate char dev region\n");
278 goto error_unregister_bus_type;
281 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
285 error_unregister_bus_type:
286 bus_unregister(&iio_bus_type);
291 static void __exit iio_exit(void)
294 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
295 bus_unregister(&iio_bus_type);
296 debugfs_remove(iio_debugfs_dentry);
299 #if defined(CONFIG_DEBUG_FS)
300 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
301 size_t count, loff_t *ppos)
303 struct iio_dev *indio_dev = file->private_data;
308 return simple_read_from_buffer(userbuf, count, ppos,
310 indio_dev->read_buf_len);
312 ret = indio_dev->info->debugfs_reg_access(indio_dev,
313 indio_dev->cached_reg_addr,
316 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
320 indio_dev->read_buf_len = snprintf(indio_dev->read_buf,
321 sizeof(indio_dev->read_buf),
324 return simple_read_from_buffer(userbuf, count, ppos,
326 indio_dev->read_buf_len);
329 static ssize_t iio_debugfs_write_reg(struct file *file,
330 const char __user *userbuf, size_t count, loff_t *ppos)
332 struct iio_dev *indio_dev = file->private_data;
337 count = min_t(size_t, count, (sizeof(buf)-1));
338 if (copy_from_user(buf, userbuf, count))
343 ret = sscanf(buf, "%i %i", ®, &val);
347 indio_dev->cached_reg_addr = reg;
350 indio_dev->cached_reg_addr = reg;
351 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
354 dev_err(indio_dev->dev.parent, "%s: write failed\n",
366 static const struct file_operations iio_debugfs_reg_fops = {
368 .read = iio_debugfs_read_reg,
369 .write = iio_debugfs_write_reg,
372 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
374 debugfs_remove_recursive(indio_dev->debugfs_dentry);
377 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
379 if (indio_dev->info->debugfs_reg_access == NULL)
382 if (!iio_debugfs_dentry)
385 indio_dev->debugfs_dentry =
386 debugfs_create_dir(dev_name(&indio_dev->dev),
389 debugfs_create_file("direct_reg_access", 0644,
390 indio_dev->debugfs_dentry, indio_dev,
391 &iio_debugfs_reg_fops);
394 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
398 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
401 #endif /* CONFIG_DEBUG_FS */
403 static ssize_t iio_read_channel_ext_info(struct device *dev,
404 struct device_attribute *attr,
407 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
408 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
409 const struct iio_chan_spec_ext_info *ext_info;
411 ext_info = &this_attr->c->ext_info[this_attr->address];
413 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
416 static ssize_t iio_write_channel_ext_info(struct device *dev,
417 struct device_attribute *attr,
421 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
422 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
423 const struct iio_chan_spec_ext_info *ext_info;
425 ext_info = &this_attr->c->ext_info[this_attr->address];
427 return ext_info->write(indio_dev, ext_info->private,
428 this_attr->c, buf, len);
431 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
432 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
434 const struct iio_enum *e = (const struct iio_enum *)priv;
441 for (i = 0; i < e->num_items; ++i)
442 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
444 /* replace last space with a newline */
449 EXPORT_SYMBOL_GPL(iio_enum_available_read);
451 ssize_t iio_enum_read(struct iio_dev *indio_dev,
452 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
454 const struct iio_enum *e = (const struct iio_enum *)priv;
460 i = e->get(indio_dev, chan);
463 else if (i >= e->num_items)
466 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
468 EXPORT_SYMBOL_GPL(iio_enum_read);
470 ssize_t iio_enum_write(struct iio_dev *indio_dev,
471 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
474 const struct iio_enum *e = (const struct iio_enum *)priv;
480 ret = __sysfs_match_string(e->items, e->num_items, buf);
484 ret = e->set(indio_dev, chan, ret);
485 return ret ? ret : len;
487 EXPORT_SYMBOL_GPL(iio_enum_write);
489 static const struct iio_mount_matrix iio_mount_idmatrix = {
497 static int iio_setup_mount_idmatrix(const struct device *dev,
498 struct iio_mount_matrix *matrix)
500 *matrix = iio_mount_idmatrix;
501 dev_info(dev, "mounting matrix not found: using identity...\n");
505 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
506 const struct iio_chan_spec *chan, char *buf)
508 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
509 priv)(indio_dev, chan);
515 mtx = &iio_mount_idmatrix;
517 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
518 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
519 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
520 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
522 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
525 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
526 * device "mount-matrix" property
527 * @dev: device the mounting matrix property is assigned to
528 * @propname: device specific mounting matrix property name
529 * @matrix: where to store retrieved matrix
531 * If device is assigned no mounting matrix property, a default 3x3 identity
532 * matrix will be filled in.
534 * Return: 0 if success, or a negative error code on failure.
536 int iio_read_mount_matrix(struct device *dev, const char *propname,
537 struct iio_mount_matrix *matrix)
539 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
542 err = device_property_read_string_array(dev, propname,
543 matrix->rotation, len);
548 /* Invalid number of matrix entries. */
552 /* Invalid matrix declaration format. */
555 /* Matrix was not declared at all: fallback to identity. */
556 return iio_setup_mount_idmatrix(dev, matrix);
558 EXPORT_SYMBOL(iio_read_mount_matrix);
560 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
561 int size, const int *vals)
563 unsigned long long tmp;
565 bool scale_db = false;
569 return snprintf(buf, len, "%d", vals[0]);
570 case IIO_VAL_INT_PLUS_MICRO_DB:
573 case IIO_VAL_INT_PLUS_MICRO:
575 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
576 -vals[1], scale_db ? " dB" : "");
578 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
579 scale_db ? " dB" : "");
580 case IIO_VAL_INT_PLUS_NANO:
582 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
585 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
586 case IIO_VAL_FRACTIONAL:
587 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
589 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
590 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
591 case IIO_VAL_FRACTIONAL_LOG2:
592 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
593 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
594 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
595 case IIO_VAL_INT_MULTIPLE:
600 for (i = 0; i < size; ++i) {
601 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
608 return snprintf(buf, len, "%c", (char)vals[0]);
615 * iio_format_value() - Formats a IIO value into its string representation
616 * @buf: The buffer to which the formatted value gets written
617 * which is assumed to be big enough (i.e. PAGE_SIZE).
618 * @type: One of the IIO_VAL_* constants. This decides how the val
619 * and val2 parameters are formatted.
620 * @size: Number of IIO value entries contained in vals
621 * @vals: Pointer to the values, exact meaning depends on the
624 * Return: 0 by default, a negative number on failure or the
625 * total number of characters written for a type that belongs
626 * to the IIO_VAL_* constant.
628 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
632 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
633 if (len >= PAGE_SIZE - 1)
636 return len + sprintf(buf + len, "\n");
638 EXPORT_SYMBOL_GPL(iio_format_value);
640 static ssize_t iio_read_channel_info(struct device *dev,
641 struct device_attribute *attr,
644 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
645 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
646 int vals[INDIO_MAX_RAW_ELEMENTS];
650 if (indio_dev->info->read_raw_multi)
651 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
652 INDIO_MAX_RAW_ELEMENTS,
656 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
657 &vals[0], &vals[1], this_attr->address);
662 return iio_format_value(buf, ret, val_len, vals);
665 static ssize_t iio_format_avail_list(char *buf, const int *vals,
666 int type, int length)
673 for (i = 0; i < length; i++) {
674 len += __iio_format_value(buf + len, PAGE_SIZE - len,
676 if (len >= PAGE_SIZE)
679 len += snprintf(buf + len, PAGE_SIZE - len,
682 len += snprintf(buf + len, PAGE_SIZE - len,
684 if (len >= PAGE_SIZE)
689 for (i = 0; i < length / 2; i++) {
690 len += __iio_format_value(buf + len, PAGE_SIZE - len,
691 type, 2, &vals[i * 2]);
692 if (len >= PAGE_SIZE)
694 if (i < length / 2 - 1)
695 len += snprintf(buf + len, PAGE_SIZE - len,
698 len += snprintf(buf + len, PAGE_SIZE - len,
700 if (len >= PAGE_SIZE)
708 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
713 len = snprintf(buf, PAGE_SIZE, "[");
716 for (i = 0; i < 3; i++) {
717 len += __iio_format_value(buf + len, PAGE_SIZE - len,
719 if (len >= PAGE_SIZE)
722 len += snprintf(buf + len, PAGE_SIZE - len,
725 len += snprintf(buf + len, PAGE_SIZE - len,
727 if (len >= PAGE_SIZE)
732 for (i = 0; i < 3; i++) {
733 len += __iio_format_value(buf + len, PAGE_SIZE - len,
734 type, 2, &vals[i * 2]);
735 if (len >= PAGE_SIZE)
738 len += snprintf(buf + len, PAGE_SIZE - len,
741 len += snprintf(buf + len, PAGE_SIZE - len,
743 if (len >= PAGE_SIZE)
751 static ssize_t iio_read_channel_info_avail(struct device *dev,
752 struct device_attribute *attr,
755 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
756 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
762 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
763 &vals, &type, &length,
770 return iio_format_avail_list(buf, vals, type, length);
771 case IIO_AVAIL_RANGE:
772 return iio_format_avail_range(buf, vals, type);
779 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
780 * @str: The string to parse
781 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
782 * @integer: The integer part of the number
783 * @fract: The fractional part of the number
784 * @scale_db: True if this should parse as dB
786 * Returns 0 on success, or a negative error code if the string could not be
789 static int __iio_str_to_fixpoint(const char *str, int fract_mult,
790 int *integer, int *fract, bool scale_db)
793 bool integer_part = true, negative = false;
795 if (fract_mult == 0) {
798 return kstrtoint(str, 0, integer);
804 } else if (str[0] == '+') {
809 if ('0' <= *str && *str <= '9') {
811 i = i * 10 + *str - '0';
813 f += fract_mult * (*str - '0');
816 } else if (*str == '\n') {
817 if (*(str + 1) == '\0')
821 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
822 /* Ignore the dB suffix */
823 str += sizeof(" dB") - 1;
825 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
826 /* Ignore the dB suffix */
827 str += sizeof("dB") - 1;
829 } else if (*str == '.' && integer_part) {
830 integer_part = false;
851 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
852 * @str: The string to parse
853 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
854 * @integer: The integer part of the number
855 * @fract: The fractional part of the number
857 * Returns 0 on success, or a negative error code if the string could not be
860 int iio_str_to_fixpoint(const char *str, int fract_mult,
861 int *integer, int *fract)
863 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
865 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
867 static ssize_t iio_write_channel_info(struct device *dev,
868 struct device_attribute *attr,
872 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
873 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
874 int ret, fract_mult = 100000;
875 int integer, fract = 0;
876 bool is_char = false;
877 bool scale_db = false;
879 /* Assumes decimal - precision based on number of digits */
880 if (!indio_dev->info->write_raw)
883 if (indio_dev->info->write_raw_get_fmt)
884 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
885 this_attr->c, this_attr->address)) {
889 case IIO_VAL_INT_PLUS_MICRO_DB:
892 case IIO_VAL_INT_PLUS_MICRO:
895 case IIO_VAL_INT_PLUS_NANO:
896 fract_mult = 100000000;
908 if (sscanf(buf, "%c", &ch) != 1)
912 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
916 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
921 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
922 integer, fract, this_attr->address);
930 int __iio_device_attr_init(struct device_attribute *dev_attr,
932 struct iio_chan_spec const *chan,
933 ssize_t (*readfunc)(struct device *dev,
934 struct device_attribute *attr,
936 ssize_t (*writefunc)(struct device *dev,
937 struct device_attribute *attr,
940 enum iio_shared_by shared_by)
945 sysfs_attr_init(&dev_attr->attr);
947 /* Build up postfix of <extend_name>_<modifier>_postfix */
948 if (chan->modified && (shared_by == IIO_SEPARATE)) {
949 if (chan->extend_name)
950 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
951 iio_modifier_names[chan
956 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
957 iio_modifier_names[chan
961 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
962 full_postfix = kstrdup(postfix, GFP_KERNEL);
964 full_postfix = kasprintf(GFP_KERNEL,
969 if (full_postfix == NULL)
972 if (chan->differential) { /* Differential can not have modifier */
974 case IIO_SHARED_BY_ALL:
975 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
977 case IIO_SHARED_BY_DIR:
978 name = kasprintf(GFP_KERNEL, "%s_%s",
979 iio_direction[chan->output],
982 case IIO_SHARED_BY_TYPE:
983 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
984 iio_direction[chan->output],
985 iio_chan_type_name_spec[chan->type],
986 iio_chan_type_name_spec[chan->type],
990 if (!chan->indexed) {
991 WARN(1, "Differential channels must be indexed\n");
993 goto error_free_full_postfix;
995 name = kasprintf(GFP_KERNEL,
997 iio_direction[chan->output],
998 iio_chan_type_name_spec[chan->type],
1000 iio_chan_type_name_spec[chan->type],
1005 } else { /* Single ended */
1006 switch (shared_by) {
1007 case IIO_SHARED_BY_ALL:
1008 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1010 case IIO_SHARED_BY_DIR:
1011 name = kasprintf(GFP_KERNEL, "%s_%s",
1012 iio_direction[chan->output],
1015 case IIO_SHARED_BY_TYPE:
1016 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1017 iio_direction[chan->output],
1018 iio_chan_type_name_spec[chan->type],
1024 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
1025 iio_direction[chan->output],
1026 iio_chan_type_name_spec[chan->type],
1030 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1031 iio_direction[chan->output],
1032 iio_chan_type_name_spec[chan->type],
1039 goto error_free_full_postfix;
1041 dev_attr->attr.name = name;
1044 dev_attr->attr.mode |= S_IRUGO;
1045 dev_attr->show = readfunc;
1049 dev_attr->attr.mode |= S_IWUSR;
1050 dev_attr->store = writefunc;
1053 error_free_full_postfix:
1054 kfree(full_postfix);
1059 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1061 kfree(dev_attr->attr.name);
1064 int __iio_add_chan_devattr(const char *postfix,
1065 struct iio_chan_spec const *chan,
1066 ssize_t (*readfunc)(struct device *dev,
1067 struct device_attribute *attr,
1069 ssize_t (*writefunc)(struct device *dev,
1070 struct device_attribute *attr,
1074 enum iio_shared_by shared_by,
1076 struct list_head *attr_list)
1079 struct iio_dev_attr *iio_attr, *t;
1081 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1082 if (iio_attr == NULL)
1084 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1086 readfunc, writefunc, shared_by);
1088 goto error_iio_dev_attr_free;
1090 iio_attr->address = mask;
1091 list_for_each_entry(t, attr_list, l)
1092 if (strcmp(t->dev_attr.attr.name,
1093 iio_attr->dev_attr.attr.name) == 0) {
1094 if (shared_by == IIO_SEPARATE)
1095 dev_err(dev, "tried to double register : %s\n",
1096 t->dev_attr.attr.name);
1098 goto error_device_attr_deinit;
1100 list_add(&iio_attr->l, attr_list);
1104 error_device_attr_deinit:
1105 __iio_device_attr_deinit(&iio_attr->dev_attr);
1106 error_iio_dev_attr_free:
1111 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1112 struct iio_chan_spec const *chan,
1113 enum iio_shared_by shared_by,
1114 const long *infomask)
1116 int i, ret, attrcount = 0;
1118 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1119 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1121 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1123 &iio_read_channel_info,
1124 &iio_write_channel_info,
1128 &indio_dev->channel_attr_list);
1129 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1139 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1140 struct iio_chan_spec const *chan,
1141 enum iio_shared_by shared_by,
1142 const long *infomask)
1144 int i, ret, attrcount = 0;
1145 char *avail_postfix;
1147 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1148 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1150 avail_postfix = kasprintf(GFP_KERNEL,
1152 iio_chan_info_postfix[i]);
1156 ret = __iio_add_chan_devattr(avail_postfix,
1158 &iio_read_channel_info_avail,
1163 &indio_dev->channel_attr_list);
1164 kfree(avail_postfix);
1165 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1175 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1176 struct iio_chan_spec const *chan)
1178 int ret, attrcount = 0;
1179 const struct iio_chan_spec_ext_info *ext_info;
1181 if (chan->channel < 0)
1183 ret = iio_device_add_info_mask_type(indio_dev, chan,
1185 &chan->info_mask_separate);
1190 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1193 info_mask_separate_available);
1198 ret = iio_device_add_info_mask_type(indio_dev, chan,
1200 &chan->info_mask_shared_by_type);
1205 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1208 info_mask_shared_by_type_available);
1213 ret = iio_device_add_info_mask_type(indio_dev, chan,
1215 &chan->info_mask_shared_by_dir);
1220 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1222 &chan->info_mask_shared_by_dir_available);
1227 ret = iio_device_add_info_mask_type(indio_dev, chan,
1229 &chan->info_mask_shared_by_all);
1234 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1236 &chan->info_mask_shared_by_all_available);
1241 if (chan->ext_info) {
1243 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1244 ret = __iio_add_chan_devattr(ext_info->name,
1247 &iio_read_channel_ext_info : NULL,
1249 &iio_write_channel_ext_info : NULL,
1253 &indio_dev->channel_attr_list);
1255 if (ret == -EBUSY && ext_info->shared)
1269 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1270 * @attr_list: List of IIO device attributes
1272 * This function frees the memory allocated for each of the IIO device
1273 * attributes in the list.
1275 void iio_free_chan_devattr_list(struct list_head *attr_list)
1277 struct iio_dev_attr *p, *n;
1279 list_for_each_entry_safe(p, n, attr_list, l) {
1280 kfree(p->dev_attr.attr.name);
1286 static ssize_t iio_show_dev_name(struct device *dev,
1287 struct device_attribute *attr,
1290 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1291 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1294 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1296 static ssize_t iio_show_dev_label(struct device *dev,
1297 struct device_attribute *attr,
1300 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1301 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1304 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1306 static ssize_t iio_show_timestamp_clock(struct device *dev,
1307 struct device_attribute *attr,
1310 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1311 const clockid_t clk = iio_device_get_clock(indio_dev);
1316 case CLOCK_REALTIME:
1317 name = "realtime\n";
1318 sz = sizeof("realtime\n");
1320 case CLOCK_MONOTONIC:
1321 name = "monotonic\n";
1322 sz = sizeof("monotonic\n");
1324 case CLOCK_MONOTONIC_RAW:
1325 name = "monotonic_raw\n";
1326 sz = sizeof("monotonic_raw\n");
1328 case CLOCK_REALTIME_COARSE:
1329 name = "realtime_coarse\n";
1330 sz = sizeof("realtime_coarse\n");
1332 case CLOCK_MONOTONIC_COARSE:
1333 name = "monotonic_coarse\n";
1334 sz = sizeof("monotonic_coarse\n");
1336 case CLOCK_BOOTTIME:
1337 name = "boottime\n";
1338 sz = sizeof("boottime\n");
1342 sz = sizeof("tai\n");
1348 memcpy(buf, name, sz);
1352 static ssize_t iio_store_timestamp_clock(struct device *dev,
1353 struct device_attribute *attr,
1354 const char *buf, size_t len)
1359 if (sysfs_streq(buf, "realtime"))
1360 clk = CLOCK_REALTIME;
1361 else if (sysfs_streq(buf, "monotonic"))
1362 clk = CLOCK_MONOTONIC;
1363 else if (sysfs_streq(buf, "monotonic_raw"))
1364 clk = CLOCK_MONOTONIC_RAW;
1365 else if (sysfs_streq(buf, "realtime_coarse"))
1366 clk = CLOCK_REALTIME_COARSE;
1367 else if (sysfs_streq(buf, "monotonic_coarse"))
1368 clk = CLOCK_MONOTONIC_COARSE;
1369 else if (sysfs_streq(buf, "boottime"))
1370 clk = CLOCK_BOOTTIME;
1371 else if (sysfs_streq(buf, "tai"))
1376 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1383 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1384 iio_show_timestamp_clock, iio_store_timestamp_clock);
1386 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1388 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1389 struct iio_dev_attr *p;
1390 struct attribute **attr, *clk = NULL;
1392 /* First count elements in any existing group */
1393 if (indio_dev->info->attrs) {
1394 attr = indio_dev->info->attrs->attrs;
1395 while (*attr++ != NULL)
1398 attrcount = attrcount_orig;
1400 * New channel registration method - relies on the fact a group does
1401 * not need to be initialized if its name is NULL.
1403 if (indio_dev->channels)
1404 for (i = 0; i < indio_dev->num_channels; i++) {
1405 const struct iio_chan_spec *chan =
1406 &indio_dev->channels[i];
1408 if (chan->type == IIO_TIMESTAMP)
1409 clk = &dev_attr_current_timestamp_clock.attr;
1411 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1413 goto error_clear_attrs;
1417 if (indio_dev->event_interface)
1418 clk = &dev_attr_current_timestamp_clock.attr;
1420 if (indio_dev->name)
1422 if (indio_dev->label)
1427 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1428 sizeof(indio_dev->chan_attr_group.attrs[0]),
1430 if (indio_dev->chan_attr_group.attrs == NULL) {
1432 goto error_clear_attrs;
1434 /* Copy across original attributes */
1435 if (indio_dev->info->attrs)
1436 memcpy(indio_dev->chan_attr_group.attrs,
1437 indio_dev->info->attrs->attrs,
1438 sizeof(indio_dev->chan_attr_group.attrs[0])
1440 attrn = attrcount_orig;
1441 /* Add all elements from the list. */
1442 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1443 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1444 if (indio_dev->name)
1445 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1446 if (indio_dev->label)
1447 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
1449 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1451 indio_dev->groups[indio_dev->groupcounter++] =
1452 &indio_dev->chan_attr_group;
1457 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1462 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1465 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1466 kfree(indio_dev->chan_attr_group.attrs);
1467 indio_dev->chan_attr_group.attrs = NULL;
1470 static void iio_dev_release(struct device *device)
1472 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1473 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1474 iio_device_unregister_trigger_consumer(indio_dev);
1475 iio_device_unregister_eventset(indio_dev);
1476 iio_device_unregister_sysfs(indio_dev);
1478 iio_buffer_put(indio_dev->buffer);
1480 ida_simple_remove(&iio_ida, indio_dev->id);
1484 struct device_type iio_device_type = {
1485 .name = "iio_device",
1486 .release = iio_dev_release,
1490 * iio_device_alloc() - allocate an iio_dev from a driver
1491 * @sizeof_priv: Space to allocate for private structure.
1493 struct iio_dev *iio_device_alloc(int sizeof_priv)
1495 struct iio_dev *dev;
1498 alloc_size = sizeof(struct iio_dev);
1500 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1501 alloc_size += sizeof_priv;
1503 /* ensure 32-byte alignment of whole construct ? */
1504 alloc_size += IIO_ALIGN - 1;
1506 dev = kzalloc(alloc_size, GFP_KERNEL);
1509 dev->dev.groups = dev->groups;
1510 dev->dev.type = &iio_device_type;
1511 dev->dev.bus = &iio_bus_type;
1512 device_initialize(&dev->dev);
1513 dev_set_drvdata(&dev->dev, (void *)dev);
1514 mutex_init(&dev->mlock);
1515 mutex_init(&dev->info_exist_lock);
1516 INIT_LIST_HEAD(&dev->channel_attr_list);
1518 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1520 /* cannot use a dev_err as the name isn't available */
1521 pr_err("failed to get device id\n");
1525 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1526 INIT_LIST_HEAD(&dev->buffer_list);
1531 EXPORT_SYMBOL(iio_device_alloc);
1534 * iio_device_free() - free an iio_dev from a driver
1535 * @dev: the iio_dev associated with the device
1537 void iio_device_free(struct iio_dev *dev)
1540 put_device(&dev->dev);
1542 EXPORT_SYMBOL(iio_device_free);
1544 static void devm_iio_device_release(struct device *dev, void *res)
1546 iio_device_free(*(struct iio_dev **)res);
1549 int devm_iio_device_match(struct device *dev, void *res, void *data)
1551 struct iio_dev **r = res;
1558 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1561 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1562 * @dev: Device to allocate iio_dev for
1563 * @sizeof_priv: Space to allocate for private structure.
1565 * Managed iio_device_alloc. iio_dev allocated with this function is
1566 * automatically freed on driver detach.
1568 * If an iio_dev allocated with this function needs to be freed separately,
1569 * devm_iio_device_free() must be used.
1572 * Pointer to allocated iio_dev on success, NULL on failure.
1574 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1576 struct iio_dev **ptr, *iio_dev;
1578 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1583 iio_dev = iio_device_alloc(sizeof_priv);
1586 devres_add(dev, ptr);
1593 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1596 * devm_iio_device_free - Resource-managed iio_device_free()
1597 * @dev: Device this iio_dev belongs to
1598 * @iio_dev: the iio_dev associated with the device
1600 * Free iio_dev allocated with devm_iio_device_alloc().
1602 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1606 rc = devres_release(dev, devm_iio_device_release,
1607 devm_iio_device_match, iio_dev);
1610 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1613 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1614 * @inode: Inode structure for identifying the device in the file system
1615 * @filp: File structure for iio device used to keep and later access
1618 * Return: 0 on success or -EBUSY if the device is already opened
1620 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1622 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1623 struct iio_dev, chrdev);
1625 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1628 iio_device_get(indio_dev);
1630 filp->private_data = indio_dev;
1636 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1637 * @inode: Inode structure pointer for the char device
1638 * @filp: File structure pointer for the char device
1640 * Return: 0 for successful release
1642 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1644 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1645 struct iio_dev, chrdev);
1646 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1647 iio_device_put(indio_dev);
1652 /* Somewhat of a cross file organization violation - ioctls here are actually
1654 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1656 struct iio_dev *indio_dev = filp->private_data;
1657 int __user *ip = (int __user *)arg;
1660 if (!indio_dev->info)
1663 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1664 fd = iio_event_getfd(indio_dev);
1667 if (copy_to_user(ip, &fd, sizeof(fd)))
1674 static const struct file_operations iio_buffer_fileops = {
1675 .read = iio_buffer_read_outer_addr,
1676 .release = iio_chrdev_release,
1677 .open = iio_chrdev_open,
1678 .poll = iio_buffer_poll_addr,
1679 .owner = THIS_MODULE,
1680 .llseek = noop_llseek,
1681 .unlocked_ioctl = iio_ioctl,
1682 .compat_ioctl = compat_ptr_ioctl,
1685 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1688 const struct iio_chan_spec *channels = indio_dev->channels;
1690 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1693 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1694 if (channels[i].scan_index < 0)
1696 for (j = i + 1; j < indio_dev->num_channels; j++)
1697 if (channels[i].scan_index == channels[j].scan_index) {
1698 dev_err(&indio_dev->dev,
1699 "Duplicate scan index %d\n",
1700 channels[i].scan_index);
1708 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1710 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1714 indio_dev->driver_module = this_mod;
1715 /* If the calling driver did not initialize of_node, do it here */
1716 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1717 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1719 indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1722 ret = iio_check_unique_scan_index(indio_dev);
1726 if (!indio_dev->info)
1729 /* configure elements for the chrdev */
1730 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1732 iio_device_register_debugfs(indio_dev);
1734 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1736 dev_err(indio_dev->dev.parent,
1737 "Failed to create buffer sysfs interfaces\n");
1738 goto error_unreg_debugfs;
1741 ret = iio_device_register_sysfs(indio_dev);
1743 dev_err(indio_dev->dev.parent,
1744 "Failed to register sysfs interfaces\n");
1745 goto error_buffer_free_sysfs;
1747 ret = iio_device_register_eventset(indio_dev);
1749 dev_err(indio_dev->dev.parent,
1750 "Failed to register event set\n");
1751 goto error_free_sysfs;
1753 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1754 iio_device_register_trigger_consumer(indio_dev);
1756 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1757 indio_dev->setup_ops == NULL)
1758 indio_dev->setup_ops = &noop_ring_setup_ops;
1760 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1762 indio_dev->chrdev.owner = this_mod;
1764 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1766 goto error_unreg_eventset;
1770 error_unreg_eventset:
1771 iio_device_unregister_eventset(indio_dev);
1773 iio_device_unregister_sysfs(indio_dev);
1774 error_buffer_free_sysfs:
1775 iio_buffer_free_sysfs_and_mask(indio_dev);
1776 error_unreg_debugfs:
1777 iio_device_unregister_debugfs(indio_dev);
1780 EXPORT_SYMBOL(__iio_device_register);
1783 * iio_device_unregister() - unregister a device from the IIO subsystem
1784 * @indio_dev: Device structure representing the device.
1786 void iio_device_unregister(struct iio_dev *indio_dev)
1788 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1790 mutex_lock(&indio_dev->info_exist_lock);
1792 iio_device_unregister_debugfs(indio_dev);
1794 iio_disable_all_buffers(indio_dev);
1796 indio_dev->info = NULL;
1798 iio_device_wakeup_eventset(indio_dev);
1799 iio_buffer_wakeup_poll(indio_dev);
1801 mutex_unlock(&indio_dev->info_exist_lock);
1803 iio_buffer_free_sysfs_and_mask(indio_dev);
1805 EXPORT_SYMBOL(iio_device_unregister);
1807 static void devm_iio_device_unreg(struct device *dev, void *res)
1809 iio_device_unregister(*(struct iio_dev **)res);
1812 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1813 struct module *this_mod)
1815 struct iio_dev **ptr;
1818 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1823 ret = __iio_device_register(indio_dev, this_mod);
1825 devres_add(dev, ptr);
1831 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1834 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1835 * @dev: Device this iio_dev belongs to
1836 * @indio_dev: the iio_dev associated with the device
1838 * Unregister iio_dev registered with devm_iio_device_register().
1840 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1844 rc = devres_release(dev, devm_iio_device_unreg,
1845 devm_iio_device_match, indio_dev);
1848 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1851 * iio_device_claim_direct_mode - Keep device in direct mode
1852 * @indio_dev: the iio_dev associated with the device
1854 * If the device is in direct mode it is guaranteed to stay
1855 * that way until iio_device_release_direct_mode() is called.
1857 * Use with iio_device_release_direct_mode()
1859 * Returns: 0 on success, -EBUSY on failure
1861 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1863 mutex_lock(&indio_dev->mlock);
1865 if (iio_buffer_enabled(indio_dev)) {
1866 mutex_unlock(&indio_dev->mlock);
1871 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1874 * iio_device_release_direct_mode - releases claim on direct mode
1875 * @indio_dev: the iio_dev associated with the device
1877 * Release the claim. Device is no longer guaranteed to stay
1880 * Use with iio_device_claim_direct_mode()
1882 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1884 mutex_unlock(&indio_dev->mlock);
1886 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1888 subsys_initcall(iio_init);
1889 module_exit(iio_exit);
1891 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1892 MODULE_DESCRIPTION("Industrial I/O core");
1893 MODULE_LICENSE("GPL");