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",
90 static const char * const iio_modifier_names[] = {
94 [IIO_MOD_X_AND_Y] = "x&y",
95 [IIO_MOD_X_AND_Z] = "x&z",
96 [IIO_MOD_Y_AND_Z] = "y&z",
97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
98 [IIO_MOD_X_OR_Y] = "x|y",
99 [IIO_MOD_X_OR_Z] = "x|z",
100 [IIO_MOD_Y_OR_Z] = "y|z",
101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
102 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
103 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
104 [IIO_MOD_LIGHT_BOTH] = "both",
105 [IIO_MOD_LIGHT_IR] = "ir",
106 [IIO_MOD_LIGHT_CLEAR] = "clear",
107 [IIO_MOD_LIGHT_RED] = "red",
108 [IIO_MOD_LIGHT_GREEN] = "green",
109 [IIO_MOD_LIGHT_BLUE] = "blue",
110 [IIO_MOD_LIGHT_UV] = "uv",
111 [IIO_MOD_QUATERNION] = "quaternion",
112 [IIO_MOD_TEMP_AMBIENT] = "ambient",
113 [IIO_MOD_TEMP_OBJECT] = "object",
114 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
115 [IIO_MOD_NORTH_TRUE] = "from_north_true",
116 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
117 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
118 [IIO_MOD_RUNNING] = "running",
119 [IIO_MOD_JOGGING] = "jogging",
120 [IIO_MOD_WALKING] = "walking",
121 [IIO_MOD_STILL] = "still",
122 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
125 [IIO_MOD_CO2] = "co2",
126 [IIO_MOD_VOC] = "voc",
129 /* relies on pairs of these shared then separate */
130 static const char * const iio_chan_info_postfix[] = {
131 [IIO_CHAN_INFO_RAW] = "raw",
132 [IIO_CHAN_INFO_PROCESSED] = "input",
133 [IIO_CHAN_INFO_SCALE] = "scale",
134 [IIO_CHAN_INFO_OFFSET] = "offset",
135 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
136 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
137 [IIO_CHAN_INFO_PEAK] = "peak_raw",
138 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
139 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
140 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
141 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
142 = "filter_low_pass_3db_frequency",
143 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
144 = "filter_high_pass_3db_frequency",
145 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
146 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
147 [IIO_CHAN_INFO_PHASE] = "phase",
148 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
149 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
150 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
151 [IIO_CHAN_INFO_ENABLE] = "en",
152 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
153 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
154 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
155 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
156 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
157 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
161 * iio_find_channel_from_si() - get channel from its scan index
163 * @si: scan index to match
165 const struct iio_chan_spec
166 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
170 for (i = 0; i < indio_dev->num_channels; i++)
171 if (indio_dev->channels[i].scan_index == si)
172 return &indio_dev->channels[i];
176 /* This turns up an awful lot */
177 ssize_t iio_read_const_attr(struct device *dev,
178 struct device_attribute *attr,
181 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
183 EXPORT_SYMBOL(iio_read_const_attr);
185 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
188 const struct iio_event_interface *ev_int = indio_dev->event_interface;
190 ret = mutex_lock_interruptible(&indio_dev->mlock);
193 if ((ev_int && iio_event_enabled(ev_int)) ||
194 iio_buffer_enabled(indio_dev)) {
195 mutex_unlock(&indio_dev->mlock);
198 indio_dev->clock_id = clock_id;
199 mutex_unlock(&indio_dev->mlock);
205 * iio_get_time_ns() - utility function to get a time stamp for events etc
208 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
212 switch (iio_device_get_clock(indio_dev)) {
214 ktime_get_real_ts(&tp);
216 case CLOCK_MONOTONIC:
219 case CLOCK_MONOTONIC_RAW:
220 getrawmonotonic(&tp);
222 case CLOCK_REALTIME_COARSE:
223 tp = current_kernel_time();
225 case CLOCK_MONOTONIC_COARSE:
226 tp = get_monotonic_coarse();
229 get_monotonic_boottime(&tp);
232 timekeeping_clocktai(&tp);
238 return timespec_to_ns(&tp);
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__);
316 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
318 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
321 static ssize_t iio_debugfs_write_reg(struct file *file,
322 const char __user *userbuf, size_t count, loff_t *ppos)
324 struct iio_dev *indio_dev = file->private_data;
329 count = min_t(size_t, count, (sizeof(buf)-1));
330 if (copy_from_user(buf, userbuf, count))
335 ret = sscanf(buf, "%i %i", ®, &val);
339 indio_dev->cached_reg_addr = reg;
342 indio_dev->cached_reg_addr = reg;
343 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
346 dev_err(indio_dev->dev.parent, "%s: write failed\n",
358 static const struct file_operations iio_debugfs_reg_fops = {
360 .read = iio_debugfs_read_reg,
361 .write = iio_debugfs_write_reg,
364 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
366 debugfs_remove_recursive(indio_dev->debugfs_dentry);
369 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
373 if (indio_dev->info->debugfs_reg_access == NULL)
376 if (!iio_debugfs_dentry)
379 indio_dev->debugfs_dentry =
380 debugfs_create_dir(dev_name(&indio_dev->dev),
382 if (indio_dev->debugfs_dentry == NULL) {
383 dev_warn(indio_dev->dev.parent,
384 "Failed to create debugfs directory\n");
388 d = debugfs_create_file("direct_reg_access", 0644,
389 indio_dev->debugfs_dentry,
390 indio_dev, &iio_debugfs_reg_fops);
392 iio_device_unregister_debugfs(indio_dev);
399 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
404 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
407 #endif /* CONFIG_DEBUG_FS */
409 static ssize_t iio_read_channel_ext_info(struct device *dev,
410 struct device_attribute *attr,
413 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
414 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
415 const struct iio_chan_spec_ext_info *ext_info;
417 ext_info = &this_attr->c->ext_info[this_attr->address];
419 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
422 static ssize_t iio_write_channel_ext_info(struct device *dev,
423 struct device_attribute *attr,
427 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
428 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
429 const struct iio_chan_spec_ext_info *ext_info;
431 ext_info = &this_attr->c->ext_info[this_attr->address];
433 return ext_info->write(indio_dev, ext_info->private,
434 this_attr->c, buf, len);
437 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
438 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
440 const struct iio_enum *e = (const struct iio_enum *)priv;
447 for (i = 0; i < e->num_items; ++i)
448 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
450 /* replace last space with a newline */
455 EXPORT_SYMBOL_GPL(iio_enum_available_read);
457 ssize_t iio_enum_read(struct iio_dev *indio_dev,
458 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
460 const struct iio_enum *e = (const struct iio_enum *)priv;
466 i = e->get(indio_dev, chan);
469 else if (i >= e->num_items)
472 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
474 EXPORT_SYMBOL_GPL(iio_enum_read);
476 ssize_t iio_enum_write(struct iio_dev *indio_dev,
477 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
480 const struct iio_enum *e = (const struct iio_enum *)priv;
487 for (i = 0; i < e->num_items; i++) {
488 if (sysfs_streq(buf, e->items[i]))
492 if (i == e->num_items)
495 ret = e->set(indio_dev, chan, i);
496 return ret ? ret : len;
498 EXPORT_SYMBOL_GPL(iio_enum_write);
500 static const struct iio_mount_matrix iio_mount_idmatrix = {
508 static int iio_setup_mount_idmatrix(const struct device *dev,
509 struct iio_mount_matrix *matrix)
511 *matrix = iio_mount_idmatrix;
512 dev_info(dev, "mounting matrix not found: using identity...\n");
516 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
517 const struct iio_chan_spec *chan, char *buf)
519 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
520 priv)(indio_dev, chan);
526 mtx = &iio_mount_idmatrix;
528 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
529 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
530 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
531 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
533 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
536 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
537 * device-tree "mount-matrix" property
538 * @dev: device the mounting matrix property is assigned to
539 * @propname: device specific mounting matrix property name
540 * @matrix: where to store retrieved matrix
542 * If device is assigned no mounting matrix property, a default 3x3 identity
543 * matrix will be filled in.
545 * Return: 0 if success, or a negative error code on failure.
548 int of_iio_read_mount_matrix(const struct device *dev,
549 const char *propname,
550 struct iio_mount_matrix *matrix)
553 int err = of_property_read_string_array(dev->of_node,
554 propname, matrix->rotation,
555 ARRAY_SIZE(iio_mount_idmatrix.rotation));
557 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
561 /* Invalid number of matrix entries. */
565 /* Invalid matrix declaration format. */
569 /* Matrix was not declared at all: fallback to identity. */
570 return iio_setup_mount_idmatrix(dev, matrix);
573 int of_iio_read_mount_matrix(const struct device *dev,
574 const char *propname,
575 struct iio_mount_matrix *matrix)
577 return iio_setup_mount_idmatrix(dev, matrix);
580 EXPORT_SYMBOL(of_iio_read_mount_matrix);
582 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
583 int size, const int *vals)
585 unsigned long long tmp;
587 bool scale_db = false;
591 return snprintf(buf, len, "%d", vals[0]);
592 case IIO_VAL_INT_PLUS_MICRO_DB:
594 case IIO_VAL_INT_PLUS_MICRO:
596 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
597 -vals[1], scale_db ? " dB" : "");
599 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
600 scale_db ? " dB" : "");
601 case IIO_VAL_INT_PLUS_NANO:
603 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
606 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
607 case IIO_VAL_FRACTIONAL:
608 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
610 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
611 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
612 case IIO_VAL_FRACTIONAL_LOG2:
613 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
614 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
615 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
616 case IIO_VAL_INT_MULTIPLE:
621 for (i = 0; i < size; ++i) {
622 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
634 * iio_format_value() - Formats a IIO value into its string representation
635 * @buf: The buffer to which the formatted value gets written
636 * which is assumed to be big enough (i.e. PAGE_SIZE).
637 * @type: One of the IIO_VAL_... constants. This decides how the val
638 * and val2 parameters are formatted.
639 * @size: Number of IIO value entries contained in vals
640 * @vals: Pointer to the values, exact meaning depends on the
643 * Return: 0 by default, a negative number on failure or the
644 * total number of characters written for a type that belongs
645 * to the IIO_VAL_... constant.
647 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
651 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
652 if (len >= PAGE_SIZE - 1)
655 return len + sprintf(buf + len, "\n");
657 EXPORT_SYMBOL_GPL(iio_format_value);
659 static ssize_t iio_read_channel_info(struct device *dev,
660 struct device_attribute *attr,
663 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
664 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
665 int vals[INDIO_MAX_RAW_ELEMENTS];
669 if (indio_dev->info->read_raw_multi)
670 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
671 INDIO_MAX_RAW_ELEMENTS,
675 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
676 &vals[0], &vals[1], this_attr->address);
681 return iio_format_value(buf, ret, val_len, vals);
684 static ssize_t iio_format_avail_list(char *buf, const int *vals,
685 int type, int length)
692 for (i = 0; i < length; i++) {
693 len += __iio_format_value(buf + len, PAGE_SIZE - len,
695 if (len >= PAGE_SIZE)
698 len += snprintf(buf + len, PAGE_SIZE - len,
701 len += snprintf(buf + len, PAGE_SIZE - len,
703 if (len >= PAGE_SIZE)
708 for (i = 0; i < length / 2; i++) {
709 len += __iio_format_value(buf + len, PAGE_SIZE - len,
710 type, 2, &vals[i * 2]);
711 if (len >= PAGE_SIZE)
713 if (i < length / 2 - 1)
714 len += snprintf(buf + len, PAGE_SIZE - len,
717 len += snprintf(buf + len, PAGE_SIZE - len,
719 if (len >= PAGE_SIZE)
727 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
732 len = snprintf(buf, PAGE_SIZE, "[");
735 for (i = 0; i < 3; i++) {
736 len += __iio_format_value(buf + len, PAGE_SIZE - len,
738 if (len >= PAGE_SIZE)
741 len += snprintf(buf + len, PAGE_SIZE - len,
744 len += snprintf(buf + len, PAGE_SIZE - len,
746 if (len >= PAGE_SIZE)
751 for (i = 0; i < 3; i++) {
752 len += __iio_format_value(buf + len, PAGE_SIZE - len,
753 type, 2, &vals[i * 2]);
754 if (len >= PAGE_SIZE)
757 len += snprintf(buf + len, PAGE_SIZE - len,
760 len += snprintf(buf + len, PAGE_SIZE - len,
762 if (len >= PAGE_SIZE)
770 static ssize_t iio_read_channel_info_avail(struct device *dev,
771 struct device_attribute *attr,
774 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
775 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
781 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
782 &vals, &type, &length,
789 return iio_format_avail_list(buf, vals, type, length);
790 case IIO_AVAIL_RANGE:
791 return iio_format_avail_range(buf, vals, type);
798 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
799 * @str: The string to parse
800 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
801 * @integer: The integer part of the number
802 * @fract: The fractional part of the number
804 * Returns 0 on success, or a negative error code if the string could not be
807 int iio_str_to_fixpoint(const char *str, int fract_mult,
808 int *integer, int *fract)
811 bool integer_part = true, negative = false;
813 if (fract_mult == 0) {
816 return kstrtoint(str, 0, integer);
822 } else if (str[0] == '+') {
827 if ('0' <= *str && *str <= '9') {
829 i = i * 10 + *str - '0';
831 f += fract_mult * (*str - '0');
834 } else if (*str == '\n') {
835 if (*(str + 1) == '\0')
839 } else if (*str == '.' && integer_part) {
840 integer_part = false;
859 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
861 static ssize_t iio_write_channel_info(struct device *dev,
862 struct device_attribute *attr,
866 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
867 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
868 int ret, fract_mult = 100000;
871 /* Assumes decimal - precision based on number of digits */
872 if (!indio_dev->info->write_raw)
875 if (indio_dev->info->write_raw_get_fmt)
876 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
877 this_attr->c, this_attr->address)) {
881 case IIO_VAL_INT_PLUS_MICRO:
884 case IIO_VAL_INT_PLUS_NANO:
885 fract_mult = 100000000;
891 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
895 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
896 integer, fract, this_attr->address);
904 int __iio_device_attr_init(struct device_attribute *dev_attr,
906 struct iio_chan_spec const *chan,
907 ssize_t (*readfunc)(struct device *dev,
908 struct device_attribute *attr,
910 ssize_t (*writefunc)(struct device *dev,
911 struct device_attribute *attr,
914 enum iio_shared_by shared_by)
919 sysfs_attr_init(&dev_attr->attr);
921 /* Build up postfix of <extend_name>_<modifier>_postfix */
922 if (chan->modified && (shared_by == IIO_SEPARATE)) {
923 if (chan->extend_name)
924 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
925 iio_modifier_names[chan
930 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
931 iio_modifier_names[chan
935 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
936 full_postfix = kstrdup(postfix, GFP_KERNEL);
938 full_postfix = kasprintf(GFP_KERNEL,
943 if (full_postfix == NULL)
946 if (chan->differential) { /* Differential can not have modifier */
948 case IIO_SHARED_BY_ALL:
949 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
951 case IIO_SHARED_BY_DIR:
952 name = kasprintf(GFP_KERNEL, "%s_%s",
953 iio_direction[chan->output],
956 case IIO_SHARED_BY_TYPE:
957 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
958 iio_direction[chan->output],
959 iio_chan_type_name_spec[chan->type],
960 iio_chan_type_name_spec[chan->type],
964 if (!chan->indexed) {
965 WARN(1, "Differential channels must be indexed\n");
967 goto error_free_full_postfix;
969 name = kasprintf(GFP_KERNEL,
971 iio_direction[chan->output],
972 iio_chan_type_name_spec[chan->type],
974 iio_chan_type_name_spec[chan->type],
979 } else { /* Single ended */
981 case IIO_SHARED_BY_ALL:
982 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
984 case IIO_SHARED_BY_DIR:
985 name = kasprintf(GFP_KERNEL, "%s_%s",
986 iio_direction[chan->output],
989 case IIO_SHARED_BY_TYPE:
990 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
991 iio_direction[chan->output],
992 iio_chan_type_name_spec[chan->type],
998 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
999 iio_direction[chan->output],
1000 iio_chan_type_name_spec[chan->type],
1004 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1005 iio_direction[chan->output],
1006 iio_chan_type_name_spec[chan->type],
1013 goto error_free_full_postfix;
1015 dev_attr->attr.name = name;
1018 dev_attr->attr.mode |= S_IRUGO;
1019 dev_attr->show = readfunc;
1023 dev_attr->attr.mode |= S_IWUSR;
1024 dev_attr->store = writefunc;
1027 error_free_full_postfix:
1028 kfree(full_postfix);
1033 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1035 kfree(dev_attr->attr.name);
1038 int __iio_add_chan_devattr(const char *postfix,
1039 struct iio_chan_spec const *chan,
1040 ssize_t (*readfunc)(struct device *dev,
1041 struct device_attribute *attr,
1043 ssize_t (*writefunc)(struct device *dev,
1044 struct device_attribute *attr,
1048 enum iio_shared_by shared_by,
1050 struct list_head *attr_list)
1053 struct iio_dev_attr *iio_attr, *t;
1055 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1056 if (iio_attr == NULL)
1058 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1060 readfunc, writefunc, shared_by);
1062 goto error_iio_dev_attr_free;
1064 iio_attr->address = mask;
1065 list_for_each_entry(t, attr_list, l)
1066 if (strcmp(t->dev_attr.attr.name,
1067 iio_attr->dev_attr.attr.name) == 0) {
1068 if (shared_by == IIO_SEPARATE)
1069 dev_err(dev, "tried to double register : %s\n",
1070 t->dev_attr.attr.name);
1072 goto error_device_attr_deinit;
1074 list_add(&iio_attr->l, attr_list);
1078 error_device_attr_deinit:
1079 __iio_device_attr_deinit(&iio_attr->dev_attr);
1080 error_iio_dev_attr_free:
1085 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1086 struct iio_chan_spec const *chan,
1087 enum iio_shared_by shared_by,
1088 const long *infomask)
1090 int i, ret, attrcount = 0;
1092 for_each_set_bit(i, infomask, sizeof(infomask)*8) {
1093 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1095 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1097 &iio_read_channel_info,
1098 &iio_write_channel_info,
1102 &indio_dev->channel_attr_list);
1103 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1113 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1114 struct iio_chan_spec const *chan,
1115 enum iio_shared_by shared_by,
1116 const long *infomask)
1118 int i, ret, attrcount = 0;
1119 char *avail_postfix;
1121 for_each_set_bit(i, infomask, sizeof(infomask) * 8) {
1122 avail_postfix = kasprintf(GFP_KERNEL,
1124 iio_chan_info_postfix[i]);
1128 ret = __iio_add_chan_devattr(avail_postfix,
1130 &iio_read_channel_info_avail,
1135 &indio_dev->channel_attr_list);
1136 kfree(avail_postfix);
1137 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1147 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1148 struct iio_chan_spec const *chan)
1150 int ret, attrcount = 0;
1151 const struct iio_chan_spec_ext_info *ext_info;
1153 if (chan->channel < 0)
1155 ret = iio_device_add_info_mask_type(indio_dev, chan,
1157 &chan->info_mask_separate);
1162 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1165 info_mask_separate_available);
1170 ret = iio_device_add_info_mask_type(indio_dev, chan,
1172 &chan->info_mask_shared_by_type);
1177 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1180 info_mask_shared_by_type_available);
1185 ret = iio_device_add_info_mask_type(indio_dev, chan,
1187 &chan->info_mask_shared_by_dir);
1192 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1194 &chan->info_mask_shared_by_dir_available);
1199 ret = iio_device_add_info_mask_type(indio_dev, chan,
1201 &chan->info_mask_shared_by_all);
1206 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1208 &chan->info_mask_shared_by_all_available);
1213 if (chan->ext_info) {
1215 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1216 ret = __iio_add_chan_devattr(ext_info->name,
1219 &iio_read_channel_ext_info : NULL,
1221 &iio_write_channel_ext_info : NULL,
1225 &indio_dev->channel_attr_list);
1227 if (ret == -EBUSY && ext_info->shared)
1241 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1242 * @attr_list: List of IIO device attributes
1244 * This function frees the memory allocated for each of the IIO device
1245 * attributes in the list.
1247 void iio_free_chan_devattr_list(struct list_head *attr_list)
1249 struct iio_dev_attr *p, *n;
1251 list_for_each_entry_safe(p, n, attr_list, l) {
1252 kfree(p->dev_attr.attr.name);
1258 static ssize_t iio_show_dev_name(struct device *dev,
1259 struct device_attribute *attr,
1262 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1263 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1266 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1268 static ssize_t iio_show_timestamp_clock(struct device *dev,
1269 struct device_attribute *attr,
1272 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1273 const clockid_t clk = iio_device_get_clock(indio_dev);
1278 case CLOCK_REALTIME:
1279 name = "realtime\n";
1280 sz = sizeof("realtime\n");
1282 case CLOCK_MONOTONIC:
1283 name = "monotonic\n";
1284 sz = sizeof("monotonic\n");
1286 case CLOCK_MONOTONIC_RAW:
1287 name = "monotonic_raw\n";
1288 sz = sizeof("monotonic_raw\n");
1290 case CLOCK_REALTIME_COARSE:
1291 name = "realtime_coarse\n";
1292 sz = sizeof("realtime_coarse\n");
1294 case CLOCK_MONOTONIC_COARSE:
1295 name = "monotonic_coarse\n";
1296 sz = sizeof("monotonic_coarse\n");
1298 case CLOCK_BOOTTIME:
1299 name = "boottime\n";
1300 sz = sizeof("boottime\n");
1304 sz = sizeof("tai\n");
1310 memcpy(buf, name, sz);
1314 static ssize_t iio_store_timestamp_clock(struct device *dev,
1315 struct device_attribute *attr,
1316 const char *buf, size_t len)
1321 if (sysfs_streq(buf, "realtime"))
1322 clk = CLOCK_REALTIME;
1323 else if (sysfs_streq(buf, "monotonic"))
1324 clk = CLOCK_MONOTONIC;
1325 else if (sysfs_streq(buf, "monotonic_raw"))
1326 clk = CLOCK_MONOTONIC_RAW;
1327 else if (sysfs_streq(buf, "realtime_coarse"))
1328 clk = CLOCK_REALTIME_COARSE;
1329 else if (sysfs_streq(buf, "monotonic_coarse"))
1330 clk = CLOCK_MONOTONIC_COARSE;
1331 else if (sysfs_streq(buf, "boottime"))
1332 clk = CLOCK_BOOTTIME;
1333 else if (sysfs_streq(buf, "tai"))
1338 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1345 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1346 iio_show_timestamp_clock, iio_store_timestamp_clock);
1348 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1350 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1351 struct iio_dev_attr *p;
1352 struct attribute **attr, *clk = NULL;
1354 /* First count elements in any existing group */
1355 if (indio_dev->info->attrs) {
1356 attr = indio_dev->info->attrs->attrs;
1357 while (*attr++ != NULL)
1360 attrcount = attrcount_orig;
1362 * New channel registration method - relies on the fact a group does
1363 * not need to be initialized if its name is NULL.
1365 if (indio_dev->channels)
1366 for (i = 0; i < indio_dev->num_channels; i++) {
1367 const struct iio_chan_spec *chan =
1368 &indio_dev->channels[i];
1370 if (chan->type == IIO_TIMESTAMP)
1371 clk = &dev_attr_current_timestamp_clock.attr;
1373 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1375 goto error_clear_attrs;
1379 if (indio_dev->event_interface)
1380 clk = &dev_attr_current_timestamp_clock.attr;
1382 if (indio_dev->name)
1387 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1388 sizeof(indio_dev->chan_attr_group.attrs[0]),
1390 if (indio_dev->chan_attr_group.attrs == NULL) {
1392 goto error_clear_attrs;
1394 /* Copy across original attributes */
1395 if (indio_dev->info->attrs)
1396 memcpy(indio_dev->chan_attr_group.attrs,
1397 indio_dev->info->attrs->attrs,
1398 sizeof(indio_dev->chan_attr_group.attrs[0])
1400 attrn = attrcount_orig;
1401 /* Add all elements from the list. */
1402 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1403 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1404 if (indio_dev->name)
1405 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1407 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1409 indio_dev->groups[indio_dev->groupcounter++] =
1410 &indio_dev->chan_attr_group;
1415 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1420 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1423 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1424 kfree(indio_dev->chan_attr_group.attrs);
1425 indio_dev->chan_attr_group.attrs = NULL;
1428 static void iio_dev_release(struct device *device)
1430 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1431 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1432 iio_device_unregister_trigger_consumer(indio_dev);
1433 iio_device_unregister_eventset(indio_dev);
1434 iio_device_unregister_sysfs(indio_dev);
1436 iio_buffer_put(indio_dev->buffer);
1438 ida_simple_remove(&iio_ida, indio_dev->id);
1442 struct device_type iio_device_type = {
1443 .name = "iio_device",
1444 .release = iio_dev_release,
1448 * iio_device_alloc() - allocate an iio_dev from a driver
1449 * @sizeof_priv: Space to allocate for private structure.
1451 struct iio_dev *iio_device_alloc(int sizeof_priv)
1453 struct iio_dev *dev;
1456 alloc_size = sizeof(struct iio_dev);
1458 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1459 alloc_size += sizeof_priv;
1461 /* ensure 32-byte alignment of whole construct ? */
1462 alloc_size += IIO_ALIGN - 1;
1464 dev = kzalloc(alloc_size, GFP_KERNEL);
1467 dev->dev.groups = dev->groups;
1468 dev->dev.type = &iio_device_type;
1469 dev->dev.bus = &iio_bus_type;
1470 device_initialize(&dev->dev);
1471 dev_set_drvdata(&dev->dev, (void *)dev);
1472 mutex_init(&dev->mlock);
1473 mutex_init(&dev->info_exist_lock);
1474 INIT_LIST_HEAD(&dev->channel_attr_list);
1476 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1478 /* cannot use a dev_err as the name isn't available */
1479 pr_err("failed to get device id\n");
1483 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1484 INIT_LIST_HEAD(&dev->buffer_list);
1489 EXPORT_SYMBOL(iio_device_alloc);
1492 * iio_device_free() - free an iio_dev from a driver
1493 * @dev: the iio_dev associated with the device
1495 void iio_device_free(struct iio_dev *dev)
1498 put_device(&dev->dev);
1500 EXPORT_SYMBOL(iio_device_free);
1502 static void devm_iio_device_release(struct device *dev, void *res)
1504 iio_device_free(*(struct iio_dev **)res);
1507 int devm_iio_device_match(struct device *dev, void *res, void *data)
1509 struct iio_dev **r = res;
1516 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1519 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1520 * @dev: Device to allocate iio_dev for
1521 * @sizeof_priv: Space to allocate for private structure.
1523 * Managed iio_device_alloc. iio_dev allocated with this function is
1524 * automatically freed on driver detach.
1526 * If an iio_dev allocated with this function needs to be freed separately,
1527 * devm_iio_device_free() must be used.
1530 * Pointer to allocated iio_dev on success, NULL on failure.
1532 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1534 struct iio_dev **ptr, *iio_dev;
1536 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1541 iio_dev = iio_device_alloc(sizeof_priv);
1544 devres_add(dev, ptr);
1551 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1554 * devm_iio_device_free - Resource-managed iio_device_free()
1555 * @dev: Device this iio_dev belongs to
1556 * @iio_dev: the iio_dev associated with the device
1558 * Free iio_dev allocated with devm_iio_device_alloc().
1560 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1564 rc = devres_release(dev, devm_iio_device_release,
1565 devm_iio_device_match, iio_dev);
1568 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1571 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1572 * @inode: Inode structure for identifying the device in the file system
1573 * @filp: File structure for iio device used to keep and later access
1576 * Return: 0 on success or -EBUSY if the device is already opened
1578 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1580 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1581 struct iio_dev, chrdev);
1583 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1586 iio_device_get(indio_dev);
1588 filp->private_data = indio_dev;
1594 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1595 * @inode: Inode structure pointer for the char device
1596 * @filp: File structure pointer for the char device
1598 * Return: 0 for successful release
1600 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1602 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1603 struct iio_dev, chrdev);
1604 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1605 iio_device_put(indio_dev);
1610 /* Somewhat of a cross file organization violation - ioctls here are actually
1612 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1614 struct iio_dev *indio_dev = filp->private_data;
1615 int __user *ip = (int __user *)arg;
1618 if (!indio_dev->info)
1621 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1622 fd = iio_event_getfd(indio_dev);
1625 if (copy_to_user(ip, &fd, sizeof(fd)))
1632 static const struct file_operations iio_buffer_fileops = {
1633 .read = iio_buffer_read_first_n_outer_addr,
1634 .release = iio_chrdev_release,
1635 .open = iio_chrdev_open,
1636 .poll = iio_buffer_poll_addr,
1637 .owner = THIS_MODULE,
1638 .llseek = noop_llseek,
1639 .unlocked_ioctl = iio_ioctl,
1640 .compat_ioctl = iio_ioctl,
1643 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1646 const struct iio_chan_spec *channels = indio_dev->channels;
1648 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1651 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1652 if (channels[i].scan_index < 0)
1654 for (j = i + 1; j < indio_dev->num_channels; j++)
1655 if (channels[i].scan_index == channels[j].scan_index) {
1656 dev_err(&indio_dev->dev,
1657 "Duplicate scan index %d\n",
1658 channels[i].scan_index);
1666 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1669 * iio_device_register() - register a device with the IIO subsystem
1670 * @indio_dev: Device structure filled by the device driver
1672 int iio_device_register(struct iio_dev *indio_dev)
1676 /* If the calling driver did not initialize of_node, do it here */
1677 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1678 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1680 ret = iio_check_unique_scan_index(indio_dev);
1684 /* configure elements for the chrdev */
1685 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1687 ret = iio_device_register_debugfs(indio_dev);
1689 dev_err(indio_dev->dev.parent,
1690 "Failed to register debugfs interfaces\n");
1694 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1696 dev_err(indio_dev->dev.parent,
1697 "Failed to create buffer sysfs interfaces\n");
1698 goto error_unreg_debugfs;
1701 ret = iio_device_register_sysfs(indio_dev);
1703 dev_err(indio_dev->dev.parent,
1704 "Failed to register sysfs interfaces\n");
1705 goto error_buffer_free_sysfs;
1707 ret = iio_device_register_eventset(indio_dev);
1709 dev_err(indio_dev->dev.parent,
1710 "Failed to register event set\n");
1711 goto error_free_sysfs;
1713 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1714 iio_device_register_trigger_consumer(indio_dev);
1716 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1717 indio_dev->setup_ops == NULL)
1718 indio_dev->setup_ops = &noop_ring_setup_ops;
1720 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1721 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1723 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1725 goto error_unreg_eventset;
1729 error_unreg_eventset:
1730 iio_device_unregister_eventset(indio_dev);
1732 iio_device_unregister_sysfs(indio_dev);
1733 error_buffer_free_sysfs:
1734 iio_buffer_free_sysfs_and_mask(indio_dev);
1735 error_unreg_debugfs:
1736 iio_device_unregister_debugfs(indio_dev);
1739 EXPORT_SYMBOL(iio_device_register);
1742 * iio_device_unregister() - unregister a device from the IIO subsystem
1743 * @indio_dev: Device structure representing the device.
1745 void iio_device_unregister(struct iio_dev *indio_dev)
1747 mutex_lock(&indio_dev->info_exist_lock);
1749 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1751 iio_device_unregister_debugfs(indio_dev);
1753 iio_disable_all_buffers(indio_dev);
1755 indio_dev->info = NULL;
1757 iio_device_wakeup_eventset(indio_dev);
1758 iio_buffer_wakeup_poll(indio_dev);
1760 mutex_unlock(&indio_dev->info_exist_lock);
1762 iio_buffer_free_sysfs_and_mask(indio_dev);
1764 EXPORT_SYMBOL(iio_device_unregister);
1766 static void devm_iio_device_unreg(struct device *dev, void *res)
1768 iio_device_unregister(*(struct iio_dev **)res);
1772 * devm_iio_device_register - Resource-managed iio_device_register()
1773 * @dev: Device to allocate iio_dev for
1774 * @indio_dev: Device structure filled by the device driver
1776 * Managed iio_device_register. The IIO device registered with this
1777 * function is automatically unregistered on driver detach. This function
1778 * calls iio_device_register() internally. Refer to that function for more
1781 * If an iio_dev registered with this function needs to be unregistered
1782 * separately, devm_iio_device_unregister() must be used.
1785 * 0 on success, negative error number on failure.
1787 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
1789 struct iio_dev **ptr;
1792 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1797 ret = iio_device_register(indio_dev);
1799 devres_add(dev, ptr);
1805 EXPORT_SYMBOL_GPL(devm_iio_device_register);
1808 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1809 * @dev: Device this iio_dev belongs to
1810 * @indio_dev: the iio_dev associated with the device
1812 * Unregister iio_dev registered with devm_iio_device_register().
1814 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1818 rc = devres_release(dev, devm_iio_device_unreg,
1819 devm_iio_device_match, indio_dev);
1822 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1825 * iio_device_claim_direct_mode - Keep device in direct mode
1826 * @indio_dev: the iio_dev associated with the device
1828 * If the device is in direct mode it is guaranteed to stay
1829 * that way until iio_device_release_direct_mode() is called.
1831 * Use with iio_device_release_direct_mode()
1833 * Returns: 0 on success, -EBUSY on failure
1835 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1837 mutex_lock(&indio_dev->mlock);
1839 if (iio_buffer_enabled(indio_dev)) {
1840 mutex_unlock(&indio_dev->mlock);
1845 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1848 * iio_device_release_direct_mode - releases claim on direct mode
1849 * @indio_dev: the iio_dev associated with the device
1851 * Release the claim. Device is no longer guaranteed to stay
1854 * Use with iio_device_claim_direct_mode()
1856 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1858 mutex_unlock(&indio_dev->mlock);
1860 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1862 subsys_initcall(iio_init);
1863 module_exit(iio_exit);
1865 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1866 MODULE_DESCRIPTION("Industrial I/O core");
1867 MODULE_LICENSE("GPL");