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 #define pr_fmt(fmt) "iio-core: " fmt
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/idr.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/device.h>
21 #include <linux/poll.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/cdev.h>
25 #include <linux/slab.h>
26 #include <linux/anon_inodes.h>
27 #include <linux/debugfs.h>
28 #include <linux/mutex.h>
29 #include <linux/iio/iio.h>
31 #include "iio_core_trigger.h"
32 #include <linux/iio/sysfs.h>
33 #include <linux/iio/events.h>
34 #include <linux/iio/buffer.h>
35 #include <linux/iio/buffer_impl.h>
37 /* IDA to assign each registered device a unique id */
38 static DEFINE_IDA(iio_ida);
40 static dev_t iio_devt;
42 #define IIO_DEV_MAX 256
43 struct bus_type iio_bus_type = {
46 EXPORT_SYMBOL(iio_bus_type);
48 static struct dentry *iio_debugfs_dentry;
50 static const char * const iio_direction[] = {
55 static const char * const iio_chan_type_name_spec[] = {
56 [IIO_VOLTAGE] = "voltage",
57 [IIO_CURRENT] = "current",
58 [IIO_POWER] = "power",
59 [IIO_ACCEL] = "accel",
60 [IIO_ANGL_VEL] = "anglvel",
62 [IIO_LIGHT] = "illuminance",
63 [IIO_INTENSITY] = "intensity",
64 [IIO_PROXIMITY] = "proximity",
66 [IIO_INCLI] = "incli",
69 [IIO_TIMESTAMP] = "timestamp",
70 [IIO_CAPACITANCE] = "capacitance",
71 [IIO_ALTVOLTAGE] = "altvoltage",
73 [IIO_PRESSURE] = "pressure",
74 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
75 [IIO_ACTIVITY] = "activity",
76 [IIO_STEPS] = "steps",
77 [IIO_ENERGY] = "energy",
78 [IIO_DISTANCE] = "distance",
79 [IIO_VELOCITY] = "velocity",
80 [IIO_CONCENTRATION] = "concentration",
81 [IIO_RESISTANCE] = "resistance",
83 [IIO_UVINDEX] = "uvindex",
84 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
85 [IIO_COUNT] = "count",
86 [IIO_INDEX] = "index",
87 [IIO_GRAVITY] = "gravity",
88 [IIO_POSITIONRELATIVE] = "positionrelative",
89 [IIO_PHASE] = "phase",
90 [IIO_MASSCONCENTRATION] = "massconcentration",
93 static const char * const iio_modifier_names[] = {
97 [IIO_MOD_X_AND_Y] = "x&y",
98 [IIO_MOD_X_AND_Z] = "x&z",
99 [IIO_MOD_Y_AND_Z] = "y&z",
100 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
101 [IIO_MOD_X_OR_Y] = "x|y",
102 [IIO_MOD_X_OR_Z] = "x|z",
103 [IIO_MOD_Y_OR_Z] = "y|z",
104 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
105 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
106 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
107 [IIO_MOD_LIGHT_BOTH] = "both",
108 [IIO_MOD_LIGHT_IR] = "ir",
109 [IIO_MOD_LIGHT_CLEAR] = "clear",
110 [IIO_MOD_LIGHT_RED] = "red",
111 [IIO_MOD_LIGHT_GREEN] = "green",
112 [IIO_MOD_LIGHT_BLUE] = "blue",
113 [IIO_MOD_LIGHT_UV] = "uv",
114 [IIO_MOD_LIGHT_DUV] = "duv",
115 [IIO_MOD_QUATERNION] = "quaternion",
116 [IIO_MOD_TEMP_AMBIENT] = "ambient",
117 [IIO_MOD_TEMP_OBJECT] = "object",
118 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
119 [IIO_MOD_NORTH_TRUE] = "from_north_true",
120 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
121 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
122 [IIO_MOD_RUNNING] = "running",
123 [IIO_MOD_JOGGING] = "jogging",
124 [IIO_MOD_WALKING] = "walking",
125 [IIO_MOD_STILL] = "still",
126 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
129 [IIO_MOD_CO2] = "co2",
130 [IIO_MOD_VOC] = "voc",
131 [IIO_MOD_PM1] = "pm1",
132 [IIO_MOD_PM2P5] = "pm2p5",
133 [IIO_MOD_PM4] = "pm4",
134 [IIO_MOD_PM10] = "pm10",
137 /* relies on pairs of these shared then separate */
138 static const char * const iio_chan_info_postfix[] = {
139 [IIO_CHAN_INFO_RAW] = "raw",
140 [IIO_CHAN_INFO_PROCESSED] = "input",
141 [IIO_CHAN_INFO_SCALE] = "scale",
142 [IIO_CHAN_INFO_OFFSET] = "offset",
143 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
144 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
145 [IIO_CHAN_INFO_PEAK] = "peak_raw",
146 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
147 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
148 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
149 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
150 = "filter_low_pass_3db_frequency",
151 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
152 = "filter_high_pass_3db_frequency",
153 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
154 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
155 [IIO_CHAN_INFO_PHASE] = "phase",
156 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
157 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
158 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
159 [IIO_CHAN_INFO_ENABLE] = "en",
160 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
161 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
162 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
163 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
164 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
165 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
169 * iio_find_channel_from_si() - get channel from its scan index
171 * @si: scan index to match
173 const struct iio_chan_spec
174 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
178 for (i = 0; i < indio_dev->num_channels; i++)
179 if (indio_dev->channels[i].scan_index == si)
180 return &indio_dev->channels[i];
184 /* This turns up an awful lot */
185 ssize_t iio_read_const_attr(struct device *dev,
186 struct device_attribute *attr,
189 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
191 EXPORT_SYMBOL(iio_read_const_attr);
193 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
196 const struct iio_event_interface *ev_int = indio_dev->event_interface;
198 ret = mutex_lock_interruptible(&indio_dev->mlock);
201 if ((ev_int && iio_event_enabled(ev_int)) ||
202 iio_buffer_enabled(indio_dev)) {
203 mutex_unlock(&indio_dev->mlock);
206 indio_dev->clock_id = clock_id;
207 mutex_unlock(&indio_dev->mlock);
213 * iio_get_time_ns() - utility function to get a time stamp for events etc
216 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
218 struct timespec64 tp;
220 switch (iio_device_get_clock(indio_dev)) {
222 return ktime_get_real_ns();
223 case CLOCK_MONOTONIC:
224 return ktime_get_ns();
225 case CLOCK_MONOTONIC_RAW:
226 return ktime_get_raw_ns();
227 case CLOCK_REALTIME_COARSE:
228 return ktime_to_ns(ktime_get_coarse_real());
229 case CLOCK_MONOTONIC_COARSE:
230 ktime_get_coarse_ts64(&tp);
231 return timespec64_to_ns(&tp);
233 return ktime_get_boot_ns();
235 return ktime_get_tai_ns();
240 EXPORT_SYMBOL(iio_get_time_ns);
243 * iio_get_time_res() - utility function to get time stamp clock resolution in
247 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
249 switch (iio_device_get_clock(indio_dev)) {
251 case CLOCK_MONOTONIC:
252 case CLOCK_MONOTONIC_RAW:
255 return hrtimer_resolution;
256 case CLOCK_REALTIME_COARSE:
257 case CLOCK_MONOTONIC_COARSE:
263 EXPORT_SYMBOL(iio_get_time_res);
265 static int __init iio_init(void)
269 /* Register sysfs bus */
270 ret = bus_register(&iio_bus_type);
272 pr_err("could not register bus type\n");
276 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
278 pr_err("failed to allocate char dev region\n");
279 goto error_unregister_bus_type;
282 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
286 error_unregister_bus_type:
287 bus_unregister(&iio_bus_type);
292 static void __exit iio_exit(void)
295 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
296 bus_unregister(&iio_bus_type);
297 debugfs_remove(iio_debugfs_dentry);
300 #if defined(CONFIG_DEBUG_FS)
301 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
302 size_t count, loff_t *ppos)
304 struct iio_dev *indio_dev = file->private_data;
310 ret = indio_dev->info->debugfs_reg_access(indio_dev,
311 indio_dev->cached_reg_addr,
314 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
318 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
320 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
323 static ssize_t iio_debugfs_write_reg(struct file *file,
324 const char __user *userbuf, size_t count, loff_t *ppos)
326 struct iio_dev *indio_dev = file->private_data;
331 count = min_t(size_t, count, (sizeof(buf)-1));
332 if (copy_from_user(buf, userbuf, count))
337 ret = sscanf(buf, "%i %i", ®, &val);
341 indio_dev->cached_reg_addr = reg;
344 indio_dev->cached_reg_addr = reg;
345 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
348 dev_err(indio_dev->dev.parent, "%s: write failed\n",
360 static const struct file_operations iio_debugfs_reg_fops = {
362 .read = iio_debugfs_read_reg,
363 .write = iio_debugfs_write_reg,
366 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
368 debugfs_remove_recursive(indio_dev->debugfs_dentry);
371 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
375 if (indio_dev->info->debugfs_reg_access == NULL)
378 if (!iio_debugfs_dentry)
381 indio_dev->debugfs_dentry =
382 debugfs_create_dir(dev_name(&indio_dev->dev),
384 if (indio_dev->debugfs_dentry == NULL) {
385 dev_warn(indio_dev->dev.parent,
386 "Failed to create debugfs directory\n");
390 d = debugfs_create_file("direct_reg_access", 0644,
391 indio_dev->debugfs_dentry,
392 indio_dev, &iio_debugfs_reg_fops);
394 iio_device_unregister_debugfs(indio_dev);
401 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
406 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
409 #endif /* CONFIG_DEBUG_FS */
411 static ssize_t iio_read_channel_ext_info(struct device *dev,
412 struct device_attribute *attr,
415 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
416 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
417 const struct iio_chan_spec_ext_info *ext_info;
419 ext_info = &this_attr->c->ext_info[this_attr->address];
421 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
424 static ssize_t iio_write_channel_ext_info(struct device *dev,
425 struct device_attribute *attr,
429 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
430 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
431 const struct iio_chan_spec_ext_info *ext_info;
433 ext_info = &this_attr->c->ext_info[this_attr->address];
435 return ext_info->write(indio_dev, ext_info->private,
436 this_attr->c, buf, len);
439 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
440 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
442 const struct iio_enum *e = (const struct iio_enum *)priv;
449 for (i = 0; i < e->num_items; ++i)
450 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
452 /* replace last space with a newline */
457 EXPORT_SYMBOL_GPL(iio_enum_available_read);
459 ssize_t iio_enum_read(struct iio_dev *indio_dev,
460 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
462 const struct iio_enum *e = (const struct iio_enum *)priv;
468 i = e->get(indio_dev, chan);
471 else if (i >= e->num_items)
474 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
476 EXPORT_SYMBOL_GPL(iio_enum_read);
478 ssize_t iio_enum_write(struct iio_dev *indio_dev,
479 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
482 const struct iio_enum *e = (const struct iio_enum *)priv;
488 ret = __sysfs_match_string(e->items, e->num_items, buf);
492 ret = e->set(indio_dev, chan, ret);
493 return ret ? ret : len;
495 EXPORT_SYMBOL_GPL(iio_enum_write);
497 static const struct iio_mount_matrix iio_mount_idmatrix = {
505 static int iio_setup_mount_idmatrix(const struct device *dev,
506 struct iio_mount_matrix *matrix)
508 *matrix = iio_mount_idmatrix;
509 dev_info(dev, "mounting matrix not found: using identity...\n");
513 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
514 const struct iio_chan_spec *chan, char *buf)
516 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
517 priv)(indio_dev, chan);
523 mtx = &iio_mount_idmatrix;
525 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
526 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
527 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
528 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
530 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
533 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
534 * device-tree "mount-matrix" property
535 * @dev: device the mounting matrix property is assigned to
536 * @propname: device specific mounting matrix property name
537 * @matrix: where to store retrieved matrix
539 * If device is assigned no mounting matrix property, a default 3x3 identity
540 * matrix will be filled in.
542 * Return: 0 if success, or a negative error code on failure.
545 int of_iio_read_mount_matrix(const struct device *dev,
546 const char *propname,
547 struct iio_mount_matrix *matrix)
550 int err = of_property_read_string_array(dev->of_node,
551 propname, matrix->rotation,
552 ARRAY_SIZE(iio_mount_idmatrix.rotation));
554 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
558 /* Invalid number of matrix entries. */
562 /* Invalid matrix declaration format. */
566 /* Matrix was not declared at all: fallback to identity. */
567 return iio_setup_mount_idmatrix(dev, matrix);
570 int of_iio_read_mount_matrix(const struct device *dev,
571 const char *propname,
572 struct iio_mount_matrix *matrix)
574 return iio_setup_mount_idmatrix(dev, matrix);
577 EXPORT_SYMBOL(of_iio_read_mount_matrix);
579 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
580 int size, const int *vals)
582 unsigned long long tmp;
584 bool scale_db = false;
588 return snprintf(buf, len, "%d", vals[0]);
589 case IIO_VAL_INT_PLUS_MICRO_DB:
592 case IIO_VAL_INT_PLUS_MICRO:
594 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
595 -vals[1], scale_db ? " dB" : "");
597 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
598 scale_db ? " dB" : "");
599 case IIO_VAL_INT_PLUS_NANO:
601 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
604 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
605 case IIO_VAL_FRACTIONAL:
606 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
608 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
609 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
610 case IIO_VAL_FRACTIONAL_LOG2:
611 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
612 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
613 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
614 case IIO_VAL_INT_MULTIPLE:
619 for (i = 0; i < size; ++i) {
620 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
632 * iio_format_value() - Formats a IIO value into its string representation
633 * @buf: The buffer to which the formatted value gets written
634 * which is assumed to be big enough (i.e. PAGE_SIZE).
635 * @type: One of the IIO_VAL_* constants. This decides how the val
636 * and val2 parameters are formatted.
637 * @size: Number of IIO value entries contained in vals
638 * @vals: Pointer to the values, exact meaning depends on the
641 * Return: 0 by default, a negative number on failure or the
642 * total number of characters written for a type that belongs
643 * to the IIO_VAL_* constant.
645 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
649 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
650 if (len >= PAGE_SIZE - 1)
653 return len + sprintf(buf + len, "\n");
655 EXPORT_SYMBOL_GPL(iio_format_value);
657 static ssize_t iio_read_channel_info(struct device *dev,
658 struct device_attribute *attr,
661 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
662 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
663 int vals[INDIO_MAX_RAW_ELEMENTS];
667 if (indio_dev->info->read_raw_multi)
668 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
669 INDIO_MAX_RAW_ELEMENTS,
673 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
674 &vals[0], &vals[1], this_attr->address);
679 return iio_format_value(buf, ret, val_len, vals);
682 static ssize_t iio_format_avail_list(char *buf, const int *vals,
683 int type, int length)
690 for (i = 0; i < length; i++) {
691 len += __iio_format_value(buf + len, PAGE_SIZE - len,
693 if (len >= PAGE_SIZE)
696 len += snprintf(buf + len, PAGE_SIZE - len,
699 len += snprintf(buf + len, PAGE_SIZE - len,
701 if (len >= PAGE_SIZE)
706 for (i = 0; i < length / 2; i++) {
707 len += __iio_format_value(buf + len, PAGE_SIZE - len,
708 type, 2, &vals[i * 2]);
709 if (len >= PAGE_SIZE)
711 if (i < length / 2 - 1)
712 len += snprintf(buf + len, PAGE_SIZE - len,
715 len += snprintf(buf + len, PAGE_SIZE - len,
717 if (len >= PAGE_SIZE)
725 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
730 len = snprintf(buf, PAGE_SIZE, "[");
733 for (i = 0; i < 3; i++) {
734 len += __iio_format_value(buf + len, PAGE_SIZE - len,
736 if (len >= PAGE_SIZE)
739 len += snprintf(buf + len, PAGE_SIZE - len,
742 len += snprintf(buf + len, PAGE_SIZE - len,
744 if (len >= PAGE_SIZE)
749 for (i = 0; i < 3; i++) {
750 len += __iio_format_value(buf + len, PAGE_SIZE - len,
751 type, 2, &vals[i * 2]);
752 if (len >= PAGE_SIZE)
755 len += snprintf(buf + len, PAGE_SIZE - len,
758 len += snprintf(buf + len, PAGE_SIZE - len,
760 if (len >= PAGE_SIZE)
768 static ssize_t iio_read_channel_info_avail(struct device *dev,
769 struct device_attribute *attr,
772 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
773 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
779 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
780 &vals, &type, &length,
787 return iio_format_avail_list(buf, vals, type, length);
788 case IIO_AVAIL_RANGE:
789 return iio_format_avail_range(buf, vals, type);
796 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
797 * @str: The string to parse
798 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
799 * @integer: The integer part of the number
800 * @fract: The fractional part of the number
802 * Returns 0 on success, or a negative error code if the string could not be
805 int iio_str_to_fixpoint(const char *str, int fract_mult,
806 int *integer, int *fract)
809 bool integer_part = true, negative = false;
811 if (fract_mult == 0) {
814 return kstrtoint(str, 0, integer);
820 } else if (str[0] == '+') {
825 if ('0' <= *str && *str <= '9') {
827 i = i * 10 + *str - '0';
829 f += fract_mult * (*str - '0');
832 } else if (*str == '\n') {
833 if (*(str + 1) == '\0')
837 } else if (*str == '.' && integer_part) {
838 integer_part = false;
857 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
859 static ssize_t iio_write_channel_info(struct device *dev,
860 struct device_attribute *attr,
864 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
865 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
866 int ret, fract_mult = 100000;
869 /* Assumes decimal - precision based on number of digits */
870 if (!indio_dev->info->write_raw)
873 if (indio_dev->info->write_raw_get_fmt)
874 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
875 this_attr->c, this_attr->address)) {
879 case IIO_VAL_INT_PLUS_MICRO:
882 case IIO_VAL_INT_PLUS_NANO:
883 fract_mult = 100000000;
889 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
893 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
894 integer, fract, this_attr->address);
902 int __iio_device_attr_init(struct device_attribute *dev_attr,
904 struct iio_chan_spec const *chan,
905 ssize_t (*readfunc)(struct device *dev,
906 struct device_attribute *attr,
908 ssize_t (*writefunc)(struct device *dev,
909 struct device_attribute *attr,
912 enum iio_shared_by shared_by)
917 sysfs_attr_init(&dev_attr->attr);
919 /* Build up postfix of <extend_name>_<modifier>_postfix */
920 if (chan->modified && (shared_by == IIO_SEPARATE)) {
921 if (chan->extend_name)
922 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
923 iio_modifier_names[chan
928 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
929 iio_modifier_names[chan
933 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
934 full_postfix = kstrdup(postfix, GFP_KERNEL);
936 full_postfix = kasprintf(GFP_KERNEL,
941 if (full_postfix == NULL)
944 if (chan->differential) { /* Differential can not have modifier */
946 case IIO_SHARED_BY_ALL:
947 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
949 case IIO_SHARED_BY_DIR:
950 name = kasprintf(GFP_KERNEL, "%s_%s",
951 iio_direction[chan->output],
954 case IIO_SHARED_BY_TYPE:
955 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
956 iio_direction[chan->output],
957 iio_chan_type_name_spec[chan->type],
958 iio_chan_type_name_spec[chan->type],
962 if (!chan->indexed) {
963 WARN(1, "Differential channels must be indexed\n");
965 goto error_free_full_postfix;
967 name = kasprintf(GFP_KERNEL,
969 iio_direction[chan->output],
970 iio_chan_type_name_spec[chan->type],
972 iio_chan_type_name_spec[chan->type],
977 } else { /* Single ended */
979 case IIO_SHARED_BY_ALL:
980 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
982 case IIO_SHARED_BY_DIR:
983 name = kasprintf(GFP_KERNEL, "%s_%s",
984 iio_direction[chan->output],
987 case IIO_SHARED_BY_TYPE:
988 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
989 iio_direction[chan->output],
990 iio_chan_type_name_spec[chan->type],
996 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
997 iio_direction[chan->output],
998 iio_chan_type_name_spec[chan->type],
1002 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1003 iio_direction[chan->output],
1004 iio_chan_type_name_spec[chan->type],
1011 goto error_free_full_postfix;
1013 dev_attr->attr.name = name;
1016 dev_attr->attr.mode |= S_IRUGO;
1017 dev_attr->show = readfunc;
1021 dev_attr->attr.mode |= S_IWUSR;
1022 dev_attr->store = writefunc;
1025 error_free_full_postfix:
1026 kfree(full_postfix);
1031 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1033 kfree(dev_attr->attr.name);
1036 int __iio_add_chan_devattr(const char *postfix,
1037 struct iio_chan_spec const *chan,
1038 ssize_t (*readfunc)(struct device *dev,
1039 struct device_attribute *attr,
1041 ssize_t (*writefunc)(struct device *dev,
1042 struct device_attribute *attr,
1046 enum iio_shared_by shared_by,
1048 struct list_head *attr_list)
1051 struct iio_dev_attr *iio_attr, *t;
1053 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1054 if (iio_attr == NULL)
1056 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1058 readfunc, writefunc, shared_by);
1060 goto error_iio_dev_attr_free;
1062 iio_attr->address = mask;
1063 list_for_each_entry(t, attr_list, l)
1064 if (strcmp(t->dev_attr.attr.name,
1065 iio_attr->dev_attr.attr.name) == 0) {
1066 if (shared_by == IIO_SEPARATE)
1067 dev_err(dev, "tried to double register : %s\n",
1068 t->dev_attr.attr.name);
1070 goto error_device_attr_deinit;
1072 list_add(&iio_attr->l, attr_list);
1076 error_device_attr_deinit:
1077 __iio_device_attr_deinit(&iio_attr->dev_attr);
1078 error_iio_dev_attr_free:
1083 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1084 struct iio_chan_spec const *chan,
1085 enum iio_shared_by shared_by,
1086 const long *infomask)
1088 int i, ret, attrcount = 0;
1090 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1091 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1093 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1095 &iio_read_channel_info,
1096 &iio_write_channel_info,
1100 &indio_dev->channel_attr_list);
1101 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1111 static int iio_device_add_info_mask_type_avail(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;
1117 char *avail_postfix;
1119 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1120 avail_postfix = kasprintf(GFP_KERNEL,
1122 iio_chan_info_postfix[i]);
1126 ret = __iio_add_chan_devattr(avail_postfix,
1128 &iio_read_channel_info_avail,
1133 &indio_dev->channel_attr_list);
1134 kfree(avail_postfix);
1135 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1145 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1146 struct iio_chan_spec const *chan)
1148 int ret, attrcount = 0;
1149 const struct iio_chan_spec_ext_info *ext_info;
1151 if (chan->channel < 0)
1153 ret = iio_device_add_info_mask_type(indio_dev, chan,
1155 &chan->info_mask_separate);
1160 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1163 info_mask_separate_available);
1168 ret = iio_device_add_info_mask_type(indio_dev, chan,
1170 &chan->info_mask_shared_by_type);
1175 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1178 info_mask_shared_by_type_available);
1183 ret = iio_device_add_info_mask_type(indio_dev, chan,
1185 &chan->info_mask_shared_by_dir);
1190 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1192 &chan->info_mask_shared_by_dir_available);
1197 ret = iio_device_add_info_mask_type(indio_dev, chan,
1199 &chan->info_mask_shared_by_all);
1204 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1206 &chan->info_mask_shared_by_all_available);
1211 if (chan->ext_info) {
1213 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1214 ret = __iio_add_chan_devattr(ext_info->name,
1217 &iio_read_channel_ext_info : NULL,
1219 &iio_write_channel_ext_info : NULL,
1223 &indio_dev->channel_attr_list);
1225 if (ret == -EBUSY && ext_info->shared)
1239 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1240 * @attr_list: List of IIO device attributes
1242 * This function frees the memory allocated for each of the IIO device
1243 * attributes in the list.
1245 void iio_free_chan_devattr_list(struct list_head *attr_list)
1247 struct iio_dev_attr *p, *n;
1249 list_for_each_entry_safe(p, n, attr_list, l) {
1250 kfree(p->dev_attr.attr.name);
1256 static ssize_t iio_show_dev_name(struct device *dev,
1257 struct device_attribute *attr,
1260 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1261 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1264 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1266 static ssize_t iio_show_timestamp_clock(struct device *dev,
1267 struct device_attribute *attr,
1270 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1271 const clockid_t clk = iio_device_get_clock(indio_dev);
1276 case CLOCK_REALTIME:
1277 name = "realtime\n";
1278 sz = sizeof("realtime\n");
1280 case CLOCK_MONOTONIC:
1281 name = "monotonic\n";
1282 sz = sizeof("monotonic\n");
1284 case CLOCK_MONOTONIC_RAW:
1285 name = "monotonic_raw\n";
1286 sz = sizeof("monotonic_raw\n");
1288 case CLOCK_REALTIME_COARSE:
1289 name = "realtime_coarse\n";
1290 sz = sizeof("realtime_coarse\n");
1292 case CLOCK_MONOTONIC_COARSE:
1293 name = "monotonic_coarse\n";
1294 sz = sizeof("monotonic_coarse\n");
1296 case CLOCK_BOOTTIME:
1297 name = "boottime\n";
1298 sz = sizeof("boottime\n");
1302 sz = sizeof("tai\n");
1308 memcpy(buf, name, sz);
1312 static ssize_t iio_store_timestamp_clock(struct device *dev,
1313 struct device_attribute *attr,
1314 const char *buf, size_t len)
1319 if (sysfs_streq(buf, "realtime"))
1320 clk = CLOCK_REALTIME;
1321 else if (sysfs_streq(buf, "monotonic"))
1322 clk = CLOCK_MONOTONIC;
1323 else if (sysfs_streq(buf, "monotonic_raw"))
1324 clk = CLOCK_MONOTONIC_RAW;
1325 else if (sysfs_streq(buf, "realtime_coarse"))
1326 clk = CLOCK_REALTIME_COARSE;
1327 else if (sysfs_streq(buf, "monotonic_coarse"))
1328 clk = CLOCK_MONOTONIC_COARSE;
1329 else if (sysfs_streq(buf, "boottime"))
1330 clk = CLOCK_BOOTTIME;
1331 else if (sysfs_streq(buf, "tai"))
1336 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1343 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1344 iio_show_timestamp_clock, iio_store_timestamp_clock);
1346 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1348 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1349 struct iio_dev_attr *p;
1350 struct attribute **attr, *clk = NULL;
1352 /* First count elements in any existing group */
1353 if (indio_dev->info->attrs) {
1354 attr = indio_dev->info->attrs->attrs;
1355 while (*attr++ != NULL)
1358 attrcount = attrcount_orig;
1360 * New channel registration method - relies on the fact a group does
1361 * not need to be initialized if its name is NULL.
1363 if (indio_dev->channels)
1364 for (i = 0; i < indio_dev->num_channels; i++) {
1365 const struct iio_chan_spec *chan =
1366 &indio_dev->channels[i];
1368 if (chan->type == IIO_TIMESTAMP)
1369 clk = &dev_attr_current_timestamp_clock.attr;
1371 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1373 goto error_clear_attrs;
1377 if (indio_dev->event_interface)
1378 clk = &dev_attr_current_timestamp_clock.attr;
1380 if (indio_dev->name)
1385 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1386 sizeof(indio_dev->chan_attr_group.attrs[0]),
1388 if (indio_dev->chan_attr_group.attrs == NULL) {
1390 goto error_clear_attrs;
1392 /* Copy across original attributes */
1393 if (indio_dev->info->attrs)
1394 memcpy(indio_dev->chan_attr_group.attrs,
1395 indio_dev->info->attrs->attrs,
1396 sizeof(indio_dev->chan_attr_group.attrs[0])
1398 attrn = attrcount_orig;
1399 /* Add all elements from the list. */
1400 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1401 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1402 if (indio_dev->name)
1403 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1405 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1407 indio_dev->groups[indio_dev->groupcounter++] =
1408 &indio_dev->chan_attr_group;
1413 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1418 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1421 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1422 kfree(indio_dev->chan_attr_group.attrs);
1423 indio_dev->chan_attr_group.attrs = NULL;
1426 static void iio_dev_release(struct device *device)
1428 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1429 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1430 iio_device_unregister_trigger_consumer(indio_dev);
1431 iio_device_unregister_eventset(indio_dev);
1432 iio_device_unregister_sysfs(indio_dev);
1434 iio_buffer_put(indio_dev->buffer);
1436 ida_simple_remove(&iio_ida, indio_dev->id);
1440 struct device_type iio_device_type = {
1441 .name = "iio_device",
1442 .release = iio_dev_release,
1446 * iio_device_alloc() - allocate an iio_dev from a driver
1447 * @sizeof_priv: Space to allocate for private structure.
1449 struct iio_dev *iio_device_alloc(int sizeof_priv)
1451 struct iio_dev *dev;
1454 alloc_size = sizeof(struct iio_dev);
1456 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1457 alloc_size += sizeof_priv;
1459 /* ensure 32-byte alignment of whole construct ? */
1460 alloc_size += IIO_ALIGN - 1;
1462 dev = kzalloc(alloc_size, GFP_KERNEL);
1465 dev->dev.groups = dev->groups;
1466 dev->dev.type = &iio_device_type;
1467 dev->dev.bus = &iio_bus_type;
1468 device_initialize(&dev->dev);
1469 dev_set_drvdata(&dev->dev, (void *)dev);
1470 mutex_init(&dev->mlock);
1471 mutex_init(&dev->info_exist_lock);
1472 INIT_LIST_HEAD(&dev->channel_attr_list);
1474 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1476 /* cannot use a dev_err as the name isn't available */
1477 pr_err("failed to get device id\n");
1481 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1482 INIT_LIST_HEAD(&dev->buffer_list);
1487 EXPORT_SYMBOL(iio_device_alloc);
1490 * iio_device_free() - free an iio_dev from a driver
1491 * @dev: the iio_dev associated with the device
1493 void iio_device_free(struct iio_dev *dev)
1496 put_device(&dev->dev);
1498 EXPORT_SYMBOL(iio_device_free);
1500 static void devm_iio_device_release(struct device *dev, void *res)
1502 iio_device_free(*(struct iio_dev **)res);
1505 int devm_iio_device_match(struct device *dev, void *res, void *data)
1507 struct iio_dev **r = res;
1514 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1517 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1518 * @dev: Device to allocate iio_dev for
1519 * @sizeof_priv: Space to allocate for private structure.
1521 * Managed iio_device_alloc. iio_dev allocated with this function is
1522 * automatically freed on driver detach.
1524 * If an iio_dev allocated with this function needs to be freed separately,
1525 * devm_iio_device_free() must be used.
1528 * Pointer to allocated iio_dev on success, NULL on failure.
1530 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1532 struct iio_dev **ptr, *iio_dev;
1534 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1539 iio_dev = iio_device_alloc(sizeof_priv);
1542 devres_add(dev, ptr);
1549 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1552 * devm_iio_device_free - Resource-managed iio_device_free()
1553 * @dev: Device this iio_dev belongs to
1554 * @iio_dev: the iio_dev associated with the device
1556 * Free iio_dev allocated with devm_iio_device_alloc().
1558 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1562 rc = devres_release(dev, devm_iio_device_release,
1563 devm_iio_device_match, iio_dev);
1566 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1569 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1570 * @inode: Inode structure for identifying the device in the file system
1571 * @filp: File structure for iio device used to keep and later access
1574 * Return: 0 on success or -EBUSY if the device is already opened
1576 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1578 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1579 struct iio_dev, chrdev);
1581 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1584 iio_device_get(indio_dev);
1586 filp->private_data = indio_dev;
1592 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1593 * @inode: Inode structure pointer for the char device
1594 * @filp: File structure pointer for the char device
1596 * Return: 0 for successful release
1598 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1600 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1601 struct iio_dev, chrdev);
1602 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1603 iio_device_put(indio_dev);
1608 /* Somewhat of a cross file organization violation - ioctls here are actually
1610 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1612 struct iio_dev *indio_dev = filp->private_data;
1613 int __user *ip = (int __user *)arg;
1616 if (!indio_dev->info)
1619 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1620 fd = iio_event_getfd(indio_dev);
1623 if (copy_to_user(ip, &fd, sizeof(fd)))
1630 static const struct file_operations iio_buffer_fileops = {
1631 .read = iio_buffer_read_first_n_outer_addr,
1632 .release = iio_chrdev_release,
1633 .open = iio_chrdev_open,
1634 .poll = iio_buffer_poll_addr,
1635 .owner = THIS_MODULE,
1636 .llseek = noop_llseek,
1637 .unlocked_ioctl = iio_ioctl,
1638 .compat_ioctl = iio_ioctl,
1641 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1644 const struct iio_chan_spec *channels = indio_dev->channels;
1646 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1649 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1650 if (channels[i].scan_index < 0)
1652 for (j = i + 1; j < indio_dev->num_channels; j++)
1653 if (channels[i].scan_index == channels[j].scan_index) {
1654 dev_err(&indio_dev->dev,
1655 "Duplicate scan index %d\n",
1656 channels[i].scan_index);
1664 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1666 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1670 indio_dev->driver_module = this_mod;
1671 /* If the calling driver did not initialize of_node, do it here */
1672 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1673 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1675 ret = iio_check_unique_scan_index(indio_dev);
1679 if (!indio_dev->info)
1682 /* configure elements for the chrdev */
1683 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1685 ret = iio_device_register_debugfs(indio_dev);
1687 dev_err(indio_dev->dev.parent,
1688 "Failed to register debugfs interfaces\n");
1692 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1694 dev_err(indio_dev->dev.parent,
1695 "Failed to create buffer sysfs interfaces\n");
1696 goto error_unreg_debugfs;
1699 ret = iio_device_register_sysfs(indio_dev);
1701 dev_err(indio_dev->dev.parent,
1702 "Failed to register sysfs interfaces\n");
1703 goto error_buffer_free_sysfs;
1705 ret = iio_device_register_eventset(indio_dev);
1707 dev_err(indio_dev->dev.parent,
1708 "Failed to register event set\n");
1709 goto error_free_sysfs;
1711 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1712 iio_device_register_trigger_consumer(indio_dev);
1714 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1715 indio_dev->setup_ops == NULL)
1716 indio_dev->setup_ops = &noop_ring_setup_ops;
1718 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1720 indio_dev->chrdev.owner = this_mod;
1722 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1724 goto error_unreg_eventset;
1728 error_unreg_eventset:
1729 iio_device_unregister_eventset(indio_dev);
1731 iio_device_unregister_sysfs(indio_dev);
1732 error_buffer_free_sysfs:
1733 iio_buffer_free_sysfs_and_mask(indio_dev);
1734 error_unreg_debugfs:
1735 iio_device_unregister_debugfs(indio_dev);
1738 EXPORT_SYMBOL(__iio_device_register);
1741 * iio_device_unregister() - unregister a device from the IIO subsystem
1742 * @indio_dev: Device structure representing the device.
1744 void iio_device_unregister(struct iio_dev *indio_dev)
1746 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1748 mutex_lock(&indio_dev->info_exist_lock);
1750 iio_device_unregister_debugfs(indio_dev);
1752 iio_disable_all_buffers(indio_dev);
1754 indio_dev->info = NULL;
1756 iio_device_wakeup_eventset(indio_dev);
1757 iio_buffer_wakeup_poll(indio_dev);
1759 mutex_unlock(&indio_dev->info_exist_lock);
1761 iio_buffer_free_sysfs_and_mask(indio_dev);
1763 EXPORT_SYMBOL(iio_device_unregister);
1765 static void devm_iio_device_unreg(struct device *dev, void *res)
1767 iio_device_unregister(*(struct iio_dev **)res);
1770 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1771 struct module *this_mod)
1773 struct iio_dev **ptr;
1776 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1781 ret = __iio_device_register(indio_dev, this_mod);
1783 devres_add(dev, ptr);
1789 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1792 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1793 * @dev: Device this iio_dev belongs to
1794 * @indio_dev: the iio_dev associated with the device
1796 * Unregister iio_dev registered with devm_iio_device_register().
1798 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1802 rc = devres_release(dev, devm_iio_device_unreg,
1803 devm_iio_device_match, indio_dev);
1806 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1809 * iio_device_claim_direct_mode - Keep device in direct mode
1810 * @indio_dev: the iio_dev associated with the device
1812 * If the device is in direct mode it is guaranteed to stay
1813 * that way until iio_device_release_direct_mode() is called.
1815 * Use with iio_device_release_direct_mode()
1817 * Returns: 0 on success, -EBUSY on failure
1819 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1821 mutex_lock(&indio_dev->mlock);
1823 if (iio_buffer_enabled(indio_dev)) {
1824 mutex_unlock(&indio_dev->mlock);
1829 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1832 * iio_device_release_direct_mode - releases claim on direct mode
1833 * @indio_dev: the iio_dev associated with the device
1835 * Release the claim. Device is no longer guaranteed to stay
1838 * Use with iio_device_claim_direct_mode()
1840 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1842 mutex_unlock(&indio_dev->mlock);
1844 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1846 subsys_initcall(iio_init);
1847 module_exit(iio_exit);
1849 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1850 MODULE_DESCRIPTION("Industrial I/O core");
1851 MODULE_LICENSE("GPL");