1 // SPDX-License-Identifier: GPL-2.0-only
2 /* The industrial I/O core
4 * Copyright (c) 2008 Jonathan Cameron
6 * Based on elements of hwmon and input subsystems.
9 #define pr_fmt(fmt) "iio-core: " fmt
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/idr.h>
14 #include <linux/kdev_t.h>
15 #include <linux/err.h>
16 #include <linux/device.h>
18 #include <linux/poll.h>
19 #include <linux/property.h>
20 #include <linux/sched.h>
21 #include <linux/wait.h>
22 #include <linux/cdev.h>
23 #include <linux/slab.h>
24 #include <linux/anon_inodes.h>
25 #include <linux/debugfs.h>
26 #include <linux/mutex.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/iio-opaque.h>
30 #include "iio_core_trigger.h"
31 #include <linux/iio/sysfs.h>
32 #include <linux/iio/events.h>
33 #include <linux/iio/buffer.h>
34 #include <linux/iio/buffer_impl.h>
36 /* IDA to assign each registered device a unique id */
37 static DEFINE_IDA(iio_ida);
39 static dev_t iio_devt;
41 #define IIO_DEV_MAX 256
42 struct bus_type iio_bus_type = {
45 EXPORT_SYMBOL(iio_bus_type);
47 static struct dentry *iio_debugfs_dentry;
49 static const char * const iio_direction[] = {
54 static const char * const iio_chan_type_name_spec[] = {
55 [IIO_VOLTAGE] = "voltage",
56 [IIO_CURRENT] = "current",
57 [IIO_POWER] = "power",
58 [IIO_ACCEL] = "accel",
59 [IIO_ANGL_VEL] = "anglvel",
61 [IIO_LIGHT] = "illuminance",
62 [IIO_INTENSITY] = "intensity",
63 [IIO_PROXIMITY] = "proximity",
65 [IIO_INCLI] = "incli",
68 [IIO_TIMESTAMP] = "timestamp",
69 [IIO_CAPACITANCE] = "capacitance",
70 [IIO_ALTVOLTAGE] = "altvoltage",
72 [IIO_PRESSURE] = "pressure",
73 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
74 [IIO_ACTIVITY] = "activity",
75 [IIO_STEPS] = "steps",
76 [IIO_ENERGY] = "energy",
77 [IIO_DISTANCE] = "distance",
78 [IIO_VELOCITY] = "velocity",
79 [IIO_CONCENTRATION] = "concentration",
80 [IIO_RESISTANCE] = "resistance",
82 [IIO_UVINDEX] = "uvindex",
83 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
84 [IIO_COUNT] = "count",
85 [IIO_INDEX] = "index",
86 [IIO_GRAVITY] = "gravity",
87 [IIO_POSITIONRELATIVE] = "positionrelative",
88 [IIO_PHASE] = "phase",
89 [IIO_MASSCONCENTRATION] = "massconcentration",
92 static const char * const iio_modifier_names[] = {
96 [IIO_MOD_X_AND_Y] = "x&y",
97 [IIO_MOD_X_AND_Z] = "x&z",
98 [IIO_MOD_Y_AND_Z] = "y&z",
99 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
100 [IIO_MOD_X_OR_Y] = "x|y",
101 [IIO_MOD_X_OR_Z] = "x|z",
102 [IIO_MOD_Y_OR_Z] = "y|z",
103 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
106 [IIO_MOD_LIGHT_BOTH] = "both",
107 [IIO_MOD_LIGHT_IR] = "ir",
108 [IIO_MOD_LIGHT_CLEAR] = "clear",
109 [IIO_MOD_LIGHT_RED] = "red",
110 [IIO_MOD_LIGHT_GREEN] = "green",
111 [IIO_MOD_LIGHT_BLUE] = "blue",
112 [IIO_MOD_LIGHT_UV] = "uv",
113 [IIO_MOD_LIGHT_DUV] = "duv",
114 [IIO_MOD_QUATERNION] = "quaternion",
115 [IIO_MOD_TEMP_AMBIENT] = "ambient",
116 [IIO_MOD_TEMP_OBJECT] = "object",
117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
121 [IIO_MOD_RUNNING] = "running",
122 [IIO_MOD_JOGGING] = "jogging",
123 [IIO_MOD_WALKING] = "walking",
124 [IIO_MOD_STILL] = "still",
125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
128 [IIO_MOD_CO2] = "co2",
129 [IIO_MOD_VOC] = "voc",
130 [IIO_MOD_PM1] = "pm1",
131 [IIO_MOD_PM2P5] = "pm2p5",
132 [IIO_MOD_PM4] = "pm4",
133 [IIO_MOD_PM10] = "pm10",
134 [IIO_MOD_ETHANOL] = "ethanol",
139 /* relies on pairs of these shared then separate */
140 static const char * const iio_chan_info_postfix[] = {
141 [IIO_CHAN_INFO_RAW] = "raw",
142 [IIO_CHAN_INFO_PROCESSED] = "input",
143 [IIO_CHAN_INFO_SCALE] = "scale",
144 [IIO_CHAN_INFO_OFFSET] = "offset",
145 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
146 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
147 [IIO_CHAN_INFO_PEAK] = "peak_raw",
148 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
149 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
150 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
151 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
152 = "filter_low_pass_3db_frequency",
153 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
154 = "filter_high_pass_3db_frequency",
155 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
156 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
157 [IIO_CHAN_INFO_PHASE] = "phase",
158 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
159 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
160 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
161 [IIO_CHAN_INFO_ENABLE] = "en",
162 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
163 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
164 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
165 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
166 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
167 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
168 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
169 [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient",
172 #if defined(CONFIG_DEBUG_FS)
174 * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
175 * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
177 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
179 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
180 return iio_dev_opaque->debugfs_dentry;
182 EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
186 * iio_find_channel_from_si() - get channel from its scan index
188 * @si: scan index to match
190 const struct iio_chan_spec
191 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
195 for (i = 0; i < indio_dev->num_channels; i++)
196 if (indio_dev->channels[i].scan_index == si)
197 return &indio_dev->channels[i];
201 /* This turns up an awful lot */
202 ssize_t iio_read_const_attr(struct device *dev,
203 struct device_attribute *attr,
206 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
208 EXPORT_SYMBOL(iio_read_const_attr);
211 * iio_device_set_clock() - Set current timestamping clock for the device
212 * @indio_dev: IIO device structure containing the device
213 * @clock_id: timestamping clock posix identifier to set.
215 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
218 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
219 const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
221 ret = mutex_lock_interruptible(&indio_dev->mlock);
224 if ((ev_int && iio_event_enabled(ev_int)) ||
225 iio_buffer_enabled(indio_dev)) {
226 mutex_unlock(&indio_dev->mlock);
229 indio_dev->clock_id = clock_id;
230 mutex_unlock(&indio_dev->mlock);
234 EXPORT_SYMBOL(iio_device_set_clock);
237 * iio_get_time_ns() - utility function to get a time stamp for events etc
240 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
242 struct timespec64 tp;
244 switch (iio_device_get_clock(indio_dev)) {
246 return ktime_get_real_ns();
247 case CLOCK_MONOTONIC:
248 return ktime_get_ns();
249 case CLOCK_MONOTONIC_RAW:
250 return ktime_get_raw_ns();
251 case CLOCK_REALTIME_COARSE:
252 return ktime_to_ns(ktime_get_coarse_real());
253 case CLOCK_MONOTONIC_COARSE:
254 ktime_get_coarse_ts64(&tp);
255 return timespec64_to_ns(&tp);
257 return ktime_get_boottime_ns();
259 return ktime_get_clocktai_ns();
264 EXPORT_SYMBOL(iio_get_time_ns);
267 * iio_get_time_res() - utility function to get time stamp clock resolution in
271 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
273 switch (iio_device_get_clock(indio_dev)) {
275 case CLOCK_MONOTONIC:
276 case CLOCK_MONOTONIC_RAW:
279 return hrtimer_resolution;
280 case CLOCK_REALTIME_COARSE:
281 case CLOCK_MONOTONIC_COARSE:
287 EXPORT_SYMBOL(iio_get_time_res);
289 static int __init iio_init(void)
293 /* Register sysfs bus */
294 ret = bus_register(&iio_bus_type);
296 pr_err("could not register bus type\n");
300 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
302 pr_err("failed to allocate char dev region\n");
303 goto error_unregister_bus_type;
306 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
310 error_unregister_bus_type:
311 bus_unregister(&iio_bus_type);
316 static void __exit iio_exit(void)
319 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
320 bus_unregister(&iio_bus_type);
321 debugfs_remove(iio_debugfs_dentry);
324 #if defined(CONFIG_DEBUG_FS)
325 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
326 size_t count, loff_t *ppos)
328 struct iio_dev *indio_dev = file->private_data;
329 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
334 return simple_read_from_buffer(userbuf, count, ppos,
335 iio_dev_opaque->read_buf,
336 iio_dev_opaque->read_buf_len);
338 ret = indio_dev->info->debugfs_reg_access(indio_dev,
339 iio_dev_opaque->cached_reg_addr,
342 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
346 iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
347 sizeof(iio_dev_opaque->read_buf),
350 return simple_read_from_buffer(userbuf, count, ppos,
351 iio_dev_opaque->read_buf,
352 iio_dev_opaque->read_buf_len);
355 static ssize_t iio_debugfs_write_reg(struct file *file,
356 const char __user *userbuf, size_t count, loff_t *ppos)
358 struct iio_dev *indio_dev = file->private_data;
359 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
364 count = min_t(size_t, count, (sizeof(buf)-1));
365 if (copy_from_user(buf, userbuf, count))
370 ret = sscanf(buf, "%i %i", ®, &val);
374 iio_dev_opaque->cached_reg_addr = reg;
377 iio_dev_opaque->cached_reg_addr = reg;
378 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
381 dev_err(indio_dev->dev.parent, "%s: write failed\n",
393 static const struct file_operations iio_debugfs_reg_fops = {
395 .read = iio_debugfs_read_reg,
396 .write = iio_debugfs_write_reg,
399 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
401 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
402 debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
405 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
407 struct iio_dev_opaque *iio_dev_opaque;
409 if (indio_dev->info->debugfs_reg_access == NULL)
412 if (!iio_debugfs_dentry)
415 iio_dev_opaque = to_iio_dev_opaque(indio_dev);
417 iio_dev_opaque->debugfs_dentry =
418 debugfs_create_dir(dev_name(&indio_dev->dev),
421 debugfs_create_file("direct_reg_access", 0644,
422 iio_dev_opaque->debugfs_dentry, indio_dev,
423 &iio_debugfs_reg_fops);
426 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
430 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
433 #endif /* CONFIG_DEBUG_FS */
435 static ssize_t iio_read_channel_ext_info(struct device *dev,
436 struct device_attribute *attr,
439 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
440 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
441 const struct iio_chan_spec_ext_info *ext_info;
443 ext_info = &this_attr->c->ext_info[this_attr->address];
445 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
448 static ssize_t iio_write_channel_ext_info(struct device *dev,
449 struct device_attribute *attr,
453 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
454 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
455 const struct iio_chan_spec_ext_info *ext_info;
457 ext_info = &this_attr->c->ext_info[this_attr->address];
459 return ext_info->write(indio_dev, ext_info->private,
460 this_attr->c, buf, len);
463 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
464 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
466 const struct iio_enum *e = (const struct iio_enum *)priv;
473 for (i = 0; i < e->num_items; ++i)
474 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
476 /* replace last space with a newline */
481 EXPORT_SYMBOL_GPL(iio_enum_available_read);
483 ssize_t iio_enum_read(struct iio_dev *indio_dev,
484 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
486 const struct iio_enum *e = (const struct iio_enum *)priv;
492 i = e->get(indio_dev, chan);
495 else if (i >= e->num_items)
498 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
500 EXPORT_SYMBOL_GPL(iio_enum_read);
502 ssize_t iio_enum_write(struct iio_dev *indio_dev,
503 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
506 const struct iio_enum *e = (const struct iio_enum *)priv;
512 ret = __sysfs_match_string(e->items, e->num_items, buf);
516 ret = e->set(indio_dev, chan, ret);
517 return ret ? ret : len;
519 EXPORT_SYMBOL_GPL(iio_enum_write);
521 static const struct iio_mount_matrix iio_mount_idmatrix = {
529 static int iio_setup_mount_idmatrix(const struct device *dev,
530 struct iio_mount_matrix *matrix)
532 *matrix = iio_mount_idmatrix;
533 dev_info(dev, "mounting matrix not found: using identity...\n");
537 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
538 const struct iio_chan_spec *chan, char *buf)
540 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
541 priv)(indio_dev, chan);
547 mtx = &iio_mount_idmatrix;
549 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
550 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
551 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
552 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
554 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
557 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
558 * device "mount-matrix" property
559 * @dev: device the mounting matrix property is assigned to
560 * @propname: device specific mounting matrix property name
561 * @matrix: where to store retrieved matrix
563 * If device is assigned no mounting matrix property, a default 3x3 identity
564 * matrix will be filled in.
566 * Return: 0 if success, or a negative error code on failure.
568 int iio_read_mount_matrix(struct device *dev, const char *propname,
569 struct iio_mount_matrix *matrix)
571 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
574 err = device_property_read_string_array(dev, propname,
575 matrix->rotation, len);
580 /* Invalid number of matrix entries. */
584 /* Invalid matrix declaration format. */
587 /* Matrix was not declared at all: fallback to identity. */
588 return iio_setup_mount_idmatrix(dev, matrix);
590 EXPORT_SYMBOL(iio_read_mount_matrix);
592 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
593 int size, const int *vals)
595 unsigned long long tmp;
597 bool scale_db = false;
601 return scnprintf(buf, len, "%d", vals[0]);
602 case IIO_VAL_INT_PLUS_MICRO_DB:
605 case IIO_VAL_INT_PLUS_MICRO:
607 return scnprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
608 -vals[1], scale_db ? " dB" : "");
610 return scnprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
611 scale_db ? " dB" : "");
612 case IIO_VAL_INT_PLUS_NANO:
614 return scnprintf(buf, len, "-%d.%09u", abs(vals[0]),
617 return scnprintf(buf, len, "%d.%09u", vals[0], vals[1]);
618 case IIO_VAL_FRACTIONAL:
619 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
621 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
622 return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
623 case IIO_VAL_FRACTIONAL_LOG2:
624 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
625 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
626 return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
627 case IIO_VAL_INT_MULTIPLE:
632 for (i = 0; i < size; ++i) {
633 l += scnprintf(&buf[l], len - l, "%d ", vals[i]);
640 return scnprintf(buf, len, "%c", (char)vals[0]);
647 * iio_format_value() - Formats a IIO value into its string representation
648 * @buf: The buffer to which the formatted value gets written
649 * which is assumed to be big enough (i.e. PAGE_SIZE).
650 * @type: One of the IIO_VAL_* constants. This decides how the val
651 * and val2 parameters are formatted.
652 * @size: Number of IIO value entries contained in vals
653 * @vals: Pointer to the values, exact meaning depends on the
656 * Return: 0 by default, a negative number on failure or the
657 * total number of characters written for a type that belongs
658 * to the IIO_VAL_* constant.
660 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
664 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
665 if (len >= PAGE_SIZE - 1)
668 return len + sprintf(buf + len, "\n");
670 EXPORT_SYMBOL_GPL(iio_format_value);
672 static ssize_t iio_read_channel_info(struct device *dev,
673 struct device_attribute *attr,
676 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
677 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
678 int vals[INDIO_MAX_RAW_ELEMENTS];
682 if (indio_dev->info->read_raw_multi)
683 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
684 INDIO_MAX_RAW_ELEMENTS,
688 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
689 &vals[0], &vals[1], this_attr->address);
694 return iio_format_value(buf, ret, val_len, vals);
697 static ssize_t iio_format_avail_list(char *buf, const int *vals,
698 int type, int length)
705 for (i = 0; i < length; i++) {
706 len += __iio_format_value(buf + len, PAGE_SIZE - len,
708 if (len >= PAGE_SIZE)
711 len += scnprintf(buf + len, PAGE_SIZE - len,
714 len += scnprintf(buf + len, PAGE_SIZE - len,
716 if (len >= PAGE_SIZE)
721 for (i = 0; i < length / 2; i++) {
722 len += __iio_format_value(buf + len, PAGE_SIZE - len,
723 type, 2, &vals[i * 2]);
724 if (len >= PAGE_SIZE)
726 if (i < length / 2 - 1)
727 len += scnprintf(buf + len, PAGE_SIZE - len,
730 len += scnprintf(buf + len, PAGE_SIZE - len,
732 if (len >= PAGE_SIZE)
740 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
745 len = snprintf(buf, PAGE_SIZE, "[");
748 for (i = 0; i < 3; i++) {
749 len += __iio_format_value(buf + len, PAGE_SIZE - len,
751 if (len >= PAGE_SIZE)
754 len += scnprintf(buf + len, PAGE_SIZE - len,
757 len += scnprintf(buf + len, PAGE_SIZE - len,
759 if (len >= PAGE_SIZE)
764 for (i = 0; i < 3; i++) {
765 len += __iio_format_value(buf + len, PAGE_SIZE - len,
766 type, 2, &vals[i * 2]);
767 if (len >= PAGE_SIZE)
770 len += scnprintf(buf + len, PAGE_SIZE - len,
773 len += scnprintf(buf + len, PAGE_SIZE - len,
775 if (len >= PAGE_SIZE)
783 static ssize_t iio_read_channel_info_avail(struct device *dev,
784 struct device_attribute *attr,
787 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
788 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
794 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
795 &vals, &type, &length,
802 return iio_format_avail_list(buf, vals, type, length);
803 case IIO_AVAIL_RANGE:
804 return iio_format_avail_range(buf, vals, type);
811 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
812 * @str: The string to parse
813 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
814 * @integer: The integer part of the number
815 * @fract: The fractional part of the number
816 * @scale_db: True if this should parse as dB
818 * Returns 0 on success, or a negative error code if the string could not be
821 static int __iio_str_to_fixpoint(const char *str, int fract_mult,
822 int *integer, int *fract, bool scale_db)
825 bool integer_part = true, negative = false;
827 if (fract_mult == 0) {
830 return kstrtoint(str, 0, integer);
836 } else if (str[0] == '+') {
841 if ('0' <= *str && *str <= '9') {
843 i = i * 10 + *str - '0';
845 f += fract_mult * (*str - '0');
848 } else if (*str == '\n') {
849 if (*(str + 1) == '\0')
853 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
854 /* Ignore the dB suffix */
855 str += sizeof(" dB") - 1;
857 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
858 /* Ignore the dB suffix */
859 str += sizeof("dB") - 1;
861 } else if (*str == '.' && integer_part) {
862 integer_part = false;
883 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
884 * @str: The string to parse
885 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
886 * @integer: The integer part of the number
887 * @fract: The fractional part of the number
889 * Returns 0 on success, or a negative error code if the string could not be
892 int iio_str_to_fixpoint(const char *str, int fract_mult,
893 int *integer, int *fract)
895 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
897 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
899 static ssize_t iio_write_channel_info(struct device *dev,
900 struct device_attribute *attr,
904 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
905 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
906 int ret, fract_mult = 100000;
907 int integer, fract = 0;
908 bool is_char = false;
909 bool scale_db = false;
911 /* Assumes decimal - precision based on number of digits */
912 if (!indio_dev->info->write_raw)
915 if (indio_dev->info->write_raw_get_fmt)
916 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
917 this_attr->c, this_attr->address)) {
921 case IIO_VAL_INT_PLUS_MICRO_DB:
924 case IIO_VAL_INT_PLUS_MICRO:
927 case IIO_VAL_INT_PLUS_NANO:
928 fract_mult = 100000000;
940 if (sscanf(buf, "%c", &ch) != 1)
944 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
950 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
951 integer, fract, this_attr->address);
959 int __iio_device_attr_init(struct device_attribute *dev_attr,
961 struct iio_chan_spec const *chan,
962 ssize_t (*readfunc)(struct device *dev,
963 struct device_attribute *attr,
965 ssize_t (*writefunc)(struct device *dev,
966 struct device_attribute *attr,
969 enum iio_shared_by shared_by)
974 sysfs_attr_init(&dev_attr->attr);
976 /* Build up postfix of <extend_name>_<modifier>_postfix */
977 if (chan->modified && (shared_by == IIO_SEPARATE)) {
978 if (chan->extend_name)
979 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
980 iio_modifier_names[chan
985 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
986 iio_modifier_names[chan
990 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
991 full_postfix = kstrdup(postfix, GFP_KERNEL);
993 full_postfix = kasprintf(GFP_KERNEL,
998 if (full_postfix == NULL)
1001 if (chan->differential) { /* Differential can not have modifier */
1002 switch (shared_by) {
1003 case IIO_SHARED_BY_ALL:
1004 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1006 case IIO_SHARED_BY_DIR:
1007 name = kasprintf(GFP_KERNEL, "%s_%s",
1008 iio_direction[chan->output],
1011 case IIO_SHARED_BY_TYPE:
1012 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
1013 iio_direction[chan->output],
1014 iio_chan_type_name_spec[chan->type],
1015 iio_chan_type_name_spec[chan->type],
1019 if (!chan->indexed) {
1020 WARN(1, "Differential channels must be indexed\n");
1022 goto error_free_full_postfix;
1024 name = kasprintf(GFP_KERNEL,
1026 iio_direction[chan->output],
1027 iio_chan_type_name_spec[chan->type],
1029 iio_chan_type_name_spec[chan->type],
1034 } else { /* Single ended */
1035 switch (shared_by) {
1036 case IIO_SHARED_BY_ALL:
1037 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1039 case IIO_SHARED_BY_DIR:
1040 name = kasprintf(GFP_KERNEL, "%s_%s",
1041 iio_direction[chan->output],
1044 case IIO_SHARED_BY_TYPE:
1045 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1046 iio_direction[chan->output],
1047 iio_chan_type_name_spec[chan->type],
1053 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
1054 iio_direction[chan->output],
1055 iio_chan_type_name_spec[chan->type],
1059 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1060 iio_direction[chan->output],
1061 iio_chan_type_name_spec[chan->type],
1068 goto error_free_full_postfix;
1070 dev_attr->attr.name = name;
1073 dev_attr->attr.mode |= S_IRUGO;
1074 dev_attr->show = readfunc;
1078 dev_attr->attr.mode |= S_IWUSR;
1079 dev_attr->store = writefunc;
1082 error_free_full_postfix:
1083 kfree(full_postfix);
1088 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1090 kfree(dev_attr->attr.name);
1093 int __iio_add_chan_devattr(const char *postfix,
1094 struct iio_chan_spec const *chan,
1095 ssize_t (*readfunc)(struct device *dev,
1096 struct device_attribute *attr,
1098 ssize_t (*writefunc)(struct device *dev,
1099 struct device_attribute *attr,
1103 enum iio_shared_by shared_by,
1105 struct list_head *attr_list)
1108 struct iio_dev_attr *iio_attr, *t;
1110 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1111 if (iio_attr == NULL)
1113 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1115 readfunc, writefunc, shared_by);
1117 goto error_iio_dev_attr_free;
1119 iio_attr->address = mask;
1120 list_for_each_entry(t, attr_list, l)
1121 if (strcmp(t->dev_attr.attr.name,
1122 iio_attr->dev_attr.attr.name) == 0) {
1123 if (shared_by == IIO_SEPARATE)
1124 dev_err(dev, "tried to double register : %s\n",
1125 t->dev_attr.attr.name);
1127 goto error_device_attr_deinit;
1129 list_add(&iio_attr->l, attr_list);
1133 error_device_attr_deinit:
1134 __iio_device_attr_deinit(&iio_attr->dev_attr);
1135 error_iio_dev_attr_free:
1140 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1141 struct iio_chan_spec const *chan,
1142 enum iio_shared_by shared_by,
1143 const long *infomask)
1145 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1146 int i, ret, attrcount = 0;
1148 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1149 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1151 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1153 &iio_read_channel_info,
1154 &iio_write_channel_info,
1158 &iio_dev_opaque->channel_attr_list);
1159 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1169 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1170 struct iio_chan_spec const *chan,
1171 enum iio_shared_by shared_by,
1172 const long *infomask)
1174 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1175 int i, ret, attrcount = 0;
1176 char *avail_postfix;
1178 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1179 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1181 avail_postfix = kasprintf(GFP_KERNEL,
1183 iio_chan_info_postfix[i]);
1187 ret = __iio_add_chan_devattr(avail_postfix,
1189 &iio_read_channel_info_avail,
1194 &iio_dev_opaque->channel_attr_list);
1195 kfree(avail_postfix);
1196 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1206 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1207 struct iio_chan_spec const *chan)
1209 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1210 int ret, attrcount = 0;
1211 const struct iio_chan_spec_ext_info *ext_info;
1213 if (chan->channel < 0)
1215 ret = iio_device_add_info_mask_type(indio_dev, chan,
1217 &chan->info_mask_separate);
1222 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1225 info_mask_separate_available);
1230 ret = iio_device_add_info_mask_type(indio_dev, chan,
1232 &chan->info_mask_shared_by_type);
1237 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1240 info_mask_shared_by_type_available);
1245 ret = iio_device_add_info_mask_type(indio_dev, chan,
1247 &chan->info_mask_shared_by_dir);
1252 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1254 &chan->info_mask_shared_by_dir_available);
1259 ret = iio_device_add_info_mask_type(indio_dev, chan,
1261 &chan->info_mask_shared_by_all);
1266 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1268 &chan->info_mask_shared_by_all_available);
1273 if (chan->ext_info) {
1275 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1276 ret = __iio_add_chan_devattr(ext_info->name,
1279 &iio_read_channel_ext_info : NULL,
1281 &iio_write_channel_ext_info : NULL,
1285 &iio_dev_opaque->channel_attr_list);
1287 if (ret == -EBUSY && ext_info->shared)
1301 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1302 * @attr_list: List of IIO device attributes
1304 * This function frees the memory allocated for each of the IIO device
1305 * attributes in the list.
1307 void iio_free_chan_devattr_list(struct list_head *attr_list)
1309 struct iio_dev_attr *p, *n;
1311 list_for_each_entry_safe(p, n, attr_list, l) {
1312 kfree(p->dev_attr.attr.name);
1318 static ssize_t iio_show_dev_name(struct device *dev,
1319 struct device_attribute *attr,
1322 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1323 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1326 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1328 static ssize_t iio_show_dev_label(struct device *dev,
1329 struct device_attribute *attr,
1332 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1333 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1336 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1338 static ssize_t iio_show_timestamp_clock(struct device *dev,
1339 struct device_attribute *attr,
1342 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1343 const clockid_t clk = iio_device_get_clock(indio_dev);
1348 case CLOCK_REALTIME:
1349 name = "realtime\n";
1350 sz = sizeof("realtime\n");
1352 case CLOCK_MONOTONIC:
1353 name = "monotonic\n";
1354 sz = sizeof("monotonic\n");
1356 case CLOCK_MONOTONIC_RAW:
1357 name = "monotonic_raw\n";
1358 sz = sizeof("monotonic_raw\n");
1360 case CLOCK_REALTIME_COARSE:
1361 name = "realtime_coarse\n";
1362 sz = sizeof("realtime_coarse\n");
1364 case CLOCK_MONOTONIC_COARSE:
1365 name = "monotonic_coarse\n";
1366 sz = sizeof("monotonic_coarse\n");
1368 case CLOCK_BOOTTIME:
1369 name = "boottime\n";
1370 sz = sizeof("boottime\n");
1374 sz = sizeof("tai\n");
1380 memcpy(buf, name, sz);
1384 static ssize_t iio_store_timestamp_clock(struct device *dev,
1385 struct device_attribute *attr,
1386 const char *buf, size_t len)
1391 if (sysfs_streq(buf, "realtime"))
1392 clk = CLOCK_REALTIME;
1393 else if (sysfs_streq(buf, "monotonic"))
1394 clk = CLOCK_MONOTONIC;
1395 else if (sysfs_streq(buf, "monotonic_raw"))
1396 clk = CLOCK_MONOTONIC_RAW;
1397 else if (sysfs_streq(buf, "realtime_coarse"))
1398 clk = CLOCK_REALTIME_COARSE;
1399 else if (sysfs_streq(buf, "monotonic_coarse"))
1400 clk = CLOCK_MONOTONIC_COARSE;
1401 else if (sysfs_streq(buf, "boottime"))
1402 clk = CLOCK_BOOTTIME;
1403 else if (sysfs_streq(buf, "tai"))
1408 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1415 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1416 iio_show_timestamp_clock, iio_store_timestamp_clock);
1418 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1420 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1421 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1422 struct iio_dev_attr *p;
1423 struct attribute **attr, *clk = NULL;
1425 /* First count elements in any existing group */
1426 if (indio_dev->info->attrs) {
1427 attr = indio_dev->info->attrs->attrs;
1428 while (*attr++ != NULL)
1431 attrcount = attrcount_orig;
1433 * New channel registration method - relies on the fact a group does
1434 * not need to be initialized if its name is NULL.
1436 if (indio_dev->channels)
1437 for (i = 0; i < indio_dev->num_channels; i++) {
1438 const struct iio_chan_spec *chan =
1439 &indio_dev->channels[i];
1441 if (chan->type == IIO_TIMESTAMP)
1442 clk = &dev_attr_current_timestamp_clock.attr;
1444 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1446 goto error_clear_attrs;
1450 if (iio_dev_opaque->event_interface)
1451 clk = &dev_attr_current_timestamp_clock.attr;
1453 if (indio_dev->name)
1455 if (indio_dev->label)
1460 iio_dev_opaque->chan_attr_group.attrs =
1461 kcalloc(attrcount + 1,
1462 sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1464 if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
1466 goto error_clear_attrs;
1468 /* Copy across original attributes */
1469 if (indio_dev->info->attrs)
1470 memcpy(iio_dev_opaque->chan_attr_group.attrs,
1471 indio_dev->info->attrs->attrs,
1472 sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
1474 attrn = attrcount_orig;
1475 /* Add all elements from the list. */
1476 list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
1477 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1478 if (indio_dev->name)
1479 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1480 if (indio_dev->label)
1481 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
1483 iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
1485 indio_dev->groups[indio_dev->groupcounter++] =
1486 &iio_dev_opaque->chan_attr_group;
1491 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1496 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1498 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1500 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1501 kfree(iio_dev_opaque->chan_attr_group.attrs);
1502 iio_dev_opaque->chan_attr_group.attrs = NULL;
1505 static void iio_dev_release(struct device *device)
1507 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1508 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1510 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1511 iio_device_unregister_trigger_consumer(indio_dev);
1512 iio_device_unregister_eventset(indio_dev);
1513 iio_device_unregister_sysfs(indio_dev);
1515 iio_buffer_put(indio_dev->buffer);
1517 ida_simple_remove(&iio_ida, indio_dev->id);
1518 kfree(iio_dev_opaque);
1521 struct device_type iio_device_type = {
1522 .name = "iio_device",
1523 .release = iio_dev_release,
1527 * iio_device_alloc() - allocate an iio_dev from a driver
1528 * @parent: Parent device.
1529 * @sizeof_priv: Space to allocate for private structure.
1531 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
1533 struct iio_dev_opaque *iio_dev_opaque;
1534 struct iio_dev *dev;
1537 alloc_size = sizeof(struct iio_dev_opaque);
1539 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1540 alloc_size += sizeof_priv;
1543 iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1544 if (!iio_dev_opaque)
1547 dev = &iio_dev_opaque->indio_dev;
1548 dev->priv = (char *)iio_dev_opaque +
1549 ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
1551 dev->dev.parent = parent;
1552 dev->dev.groups = dev->groups;
1553 dev->dev.type = &iio_device_type;
1554 dev->dev.bus = &iio_bus_type;
1555 device_initialize(&dev->dev);
1556 dev_set_drvdata(&dev->dev, (void *)dev);
1557 mutex_init(&dev->mlock);
1558 mutex_init(&dev->info_exist_lock);
1559 INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
1561 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1563 /* cannot use a dev_err as the name isn't available */
1564 pr_err("failed to get device id\n");
1565 kfree(iio_dev_opaque);
1568 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1569 INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
1573 EXPORT_SYMBOL(iio_device_alloc);
1576 * iio_device_free() - free an iio_dev from a driver
1577 * @dev: the iio_dev associated with the device
1579 void iio_device_free(struct iio_dev *dev)
1582 put_device(&dev->dev);
1584 EXPORT_SYMBOL(iio_device_free);
1586 static void devm_iio_device_release(struct device *dev, void *res)
1588 iio_device_free(*(struct iio_dev **)res);
1592 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1593 * @parent: Device to allocate iio_dev for, and parent for this IIO device
1594 * @sizeof_priv: Space to allocate for private structure.
1596 * Managed iio_device_alloc. iio_dev allocated with this function is
1597 * automatically freed on driver detach.
1600 * Pointer to allocated iio_dev on success, NULL on failure.
1602 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
1604 struct iio_dev **ptr, *iio_dev;
1606 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1611 iio_dev = iio_device_alloc(parent, sizeof_priv);
1614 devres_add(parent, ptr);
1621 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1624 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1625 * @inode: Inode structure for identifying the device in the file system
1626 * @filp: File structure for iio device used to keep and later access
1629 * Return: 0 on success or -EBUSY if the device is already opened
1631 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1633 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1634 struct iio_dev, chrdev);
1636 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1639 iio_device_get(indio_dev);
1641 filp->private_data = indio_dev;
1647 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1648 * @inode: Inode structure pointer for the char device
1649 * @filp: File structure pointer for the char device
1651 * Return: 0 for successful release
1653 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1655 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1656 struct iio_dev, chrdev);
1657 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1658 iio_device_put(indio_dev);
1663 /* Somewhat of a cross file organization violation - ioctls here are actually
1665 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1667 struct iio_dev *indio_dev = filp->private_data;
1668 int __user *ip = (int __user *)arg;
1671 if (!indio_dev->info)
1674 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1675 fd = iio_event_getfd(indio_dev);
1678 if (copy_to_user(ip, &fd, sizeof(fd)))
1685 static const struct file_operations iio_buffer_fileops = {
1686 .read = iio_buffer_read_outer_addr,
1687 .release = iio_chrdev_release,
1688 .open = iio_chrdev_open,
1689 .poll = iio_buffer_poll_addr,
1690 .owner = THIS_MODULE,
1691 .llseek = noop_llseek,
1692 .unlocked_ioctl = iio_ioctl,
1693 .compat_ioctl = compat_ptr_ioctl,
1696 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1699 const struct iio_chan_spec *channels = indio_dev->channels;
1701 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1704 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1705 if (channels[i].scan_index < 0)
1707 for (j = i + 1; j < indio_dev->num_channels; j++)
1708 if (channels[i].scan_index == channels[j].scan_index) {
1709 dev_err(&indio_dev->dev,
1710 "Duplicate scan index %d\n",
1711 channels[i].scan_index);
1719 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1721 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1725 if (!indio_dev->info)
1728 indio_dev->driver_module = this_mod;
1729 /* If the calling driver did not initialize of_node, do it here */
1730 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1731 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1733 indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1736 ret = iio_check_unique_scan_index(indio_dev);
1740 /* configure elements for the chrdev */
1741 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1743 iio_device_register_debugfs(indio_dev);
1745 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1747 dev_err(indio_dev->dev.parent,
1748 "Failed to create buffer sysfs interfaces\n");
1749 goto error_unreg_debugfs;
1752 ret = iio_device_register_sysfs(indio_dev);
1754 dev_err(indio_dev->dev.parent,
1755 "Failed to register sysfs interfaces\n");
1756 goto error_buffer_free_sysfs;
1758 ret = iio_device_register_eventset(indio_dev);
1760 dev_err(indio_dev->dev.parent,
1761 "Failed to register event set\n");
1762 goto error_free_sysfs;
1764 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1765 iio_device_register_trigger_consumer(indio_dev);
1767 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1768 indio_dev->setup_ops == NULL)
1769 indio_dev->setup_ops = &noop_ring_setup_ops;
1771 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1773 indio_dev->chrdev.owner = this_mod;
1775 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1777 goto error_unreg_eventset;
1781 error_unreg_eventset:
1782 iio_device_unregister_eventset(indio_dev);
1784 iio_device_unregister_sysfs(indio_dev);
1785 error_buffer_free_sysfs:
1786 iio_buffer_free_sysfs_and_mask(indio_dev);
1787 error_unreg_debugfs:
1788 iio_device_unregister_debugfs(indio_dev);
1791 EXPORT_SYMBOL(__iio_device_register);
1794 * iio_device_unregister() - unregister a device from the IIO subsystem
1795 * @indio_dev: Device structure representing the device.
1797 void iio_device_unregister(struct iio_dev *indio_dev)
1799 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1801 mutex_lock(&indio_dev->info_exist_lock);
1803 iio_device_unregister_debugfs(indio_dev);
1805 iio_disable_all_buffers(indio_dev);
1807 indio_dev->info = NULL;
1809 iio_device_wakeup_eventset(indio_dev);
1810 iio_buffer_wakeup_poll(indio_dev);
1812 mutex_unlock(&indio_dev->info_exist_lock);
1814 iio_buffer_free_sysfs_and_mask(indio_dev);
1816 EXPORT_SYMBOL(iio_device_unregister);
1818 static void devm_iio_device_unreg(struct device *dev, void *res)
1820 iio_device_unregister(*(struct iio_dev **)res);
1823 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1824 struct module *this_mod)
1826 struct iio_dev **ptr;
1829 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1834 ret = __iio_device_register(indio_dev, this_mod);
1836 devres_add(dev, ptr);
1842 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1845 * iio_device_claim_direct_mode - Keep device in direct mode
1846 * @indio_dev: the iio_dev associated with the device
1848 * If the device is in direct mode it is guaranteed to stay
1849 * that way until iio_device_release_direct_mode() is called.
1851 * Use with iio_device_release_direct_mode()
1853 * Returns: 0 on success, -EBUSY on failure
1855 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1857 mutex_lock(&indio_dev->mlock);
1859 if (iio_buffer_enabled(indio_dev)) {
1860 mutex_unlock(&indio_dev->mlock);
1865 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1868 * iio_device_release_direct_mode - releases claim on direct mode
1869 * @indio_dev: the iio_dev associated with the device
1871 * Release the claim. Device is no longer guaranteed to stay
1874 * Use with iio_device_claim_direct_mode()
1876 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1878 mutex_unlock(&indio_dev->mlock);
1880 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1882 subsys_initcall(iio_init);
1883 module_exit(iio_exit);
1885 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1886 MODULE_DESCRIPTION("Industrial I/O core");
1887 MODULE_LICENSE("GPL");