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",
173 * iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
174 * @array: array of strings
175 * @n: number of strings in the array
176 * @str: string to match with
178 * Returns index of @str in the @array or -EINVAL, similar to match_string().
179 * Uses sysfs_streq instead of strcmp for matching.
181 * This routine will look for a string in an array of strings.
182 * The search will continue until the element is found or the n-th element
183 * is reached, regardless of any NULL elements in the array.
185 static int iio_sysfs_match_string_with_gaps(const char * const *array, size_t n,
191 for (index = 0; index < n; index++) {
195 if (sysfs_streq(item, str))
202 #if defined(CONFIG_DEBUG_FS)
204 * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
205 * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
207 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
209 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
210 return iio_dev_opaque->debugfs_dentry;
212 EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
216 * iio_find_channel_from_si() - get channel from its scan index
218 * @si: scan index to match
220 const struct iio_chan_spec
221 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
225 for (i = 0; i < indio_dev->num_channels; i++)
226 if (indio_dev->channels[i].scan_index == si)
227 return &indio_dev->channels[i];
231 /* This turns up an awful lot */
232 ssize_t iio_read_const_attr(struct device *dev,
233 struct device_attribute *attr,
236 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
238 EXPORT_SYMBOL(iio_read_const_attr);
241 * iio_device_set_clock() - Set current timestamping clock for the device
242 * @indio_dev: IIO device structure containing the device
243 * @clock_id: timestamping clock posix identifier to set.
245 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
248 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
249 const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
251 ret = mutex_lock_interruptible(&indio_dev->mlock);
254 if ((ev_int && iio_event_enabled(ev_int)) ||
255 iio_buffer_enabled(indio_dev)) {
256 mutex_unlock(&indio_dev->mlock);
259 indio_dev->clock_id = clock_id;
260 mutex_unlock(&indio_dev->mlock);
264 EXPORT_SYMBOL(iio_device_set_clock);
267 * iio_get_time_ns() - utility function to get a time stamp for events etc
270 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
272 struct timespec64 tp;
274 switch (iio_device_get_clock(indio_dev)) {
276 return ktime_get_real_ns();
277 case CLOCK_MONOTONIC:
278 return ktime_get_ns();
279 case CLOCK_MONOTONIC_RAW:
280 return ktime_get_raw_ns();
281 case CLOCK_REALTIME_COARSE:
282 return ktime_to_ns(ktime_get_coarse_real());
283 case CLOCK_MONOTONIC_COARSE:
284 ktime_get_coarse_ts64(&tp);
285 return timespec64_to_ns(&tp);
287 return ktime_get_boottime_ns();
289 return ktime_get_clocktai_ns();
294 EXPORT_SYMBOL(iio_get_time_ns);
297 * iio_get_time_res() - utility function to get time stamp clock resolution in
301 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
303 switch (iio_device_get_clock(indio_dev)) {
305 case CLOCK_MONOTONIC:
306 case CLOCK_MONOTONIC_RAW:
309 return hrtimer_resolution;
310 case CLOCK_REALTIME_COARSE:
311 case CLOCK_MONOTONIC_COARSE:
317 EXPORT_SYMBOL(iio_get_time_res);
319 static int __init iio_init(void)
323 /* Register sysfs bus */
324 ret = bus_register(&iio_bus_type);
326 pr_err("could not register bus type\n");
330 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
332 pr_err("failed to allocate char dev region\n");
333 goto error_unregister_bus_type;
336 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
340 error_unregister_bus_type:
341 bus_unregister(&iio_bus_type);
346 static void __exit iio_exit(void)
349 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
350 bus_unregister(&iio_bus_type);
351 debugfs_remove(iio_debugfs_dentry);
354 #if defined(CONFIG_DEBUG_FS)
355 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
356 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 return simple_read_from_buffer(userbuf, count, ppos,
365 iio_dev_opaque->read_buf,
366 iio_dev_opaque->read_buf_len);
368 ret = indio_dev->info->debugfs_reg_access(indio_dev,
369 iio_dev_opaque->cached_reg_addr,
372 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
376 iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
377 sizeof(iio_dev_opaque->read_buf),
380 return simple_read_from_buffer(userbuf, count, ppos,
381 iio_dev_opaque->read_buf,
382 iio_dev_opaque->read_buf_len);
385 static ssize_t iio_debugfs_write_reg(struct file *file,
386 const char __user *userbuf, size_t count, loff_t *ppos)
388 struct iio_dev *indio_dev = file->private_data;
389 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
394 count = min_t(size_t, count, (sizeof(buf)-1));
395 if (copy_from_user(buf, userbuf, count))
400 ret = sscanf(buf, "%i %i", ®, &val);
404 iio_dev_opaque->cached_reg_addr = reg;
407 iio_dev_opaque->cached_reg_addr = reg;
408 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
411 dev_err(indio_dev->dev.parent, "%s: write failed\n",
423 static const struct file_operations iio_debugfs_reg_fops = {
425 .read = iio_debugfs_read_reg,
426 .write = iio_debugfs_write_reg,
429 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
431 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
432 debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
435 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
437 struct iio_dev_opaque *iio_dev_opaque;
439 if (indio_dev->info->debugfs_reg_access == NULL)
442 if (!iio_debugfs_dentry)
445 iio_dev_opaque = to_iio_dev_opaque(indio_dev);
447 iio_dev_opaque->debugfs_dentry =
448 debugfs_create_dir(dev_name(&indio_dev->dev),
451 debugfs_create_file("direct_reg_access", 0644,
452 iio_dev_opaque->debugfs_dentry, indio_dev,
453 &iio_debugfs_reg_fops);
456 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
460 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
463 #endif /* CONFIG_DEBUG_FS */
465 static ssize_t iio_read_channel_ext_info(struct device *dev,
466 struct device_attribute *attr,
469 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
470 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
471 const struct iio_chan_spec_ext_info *ext_info;
473 ext_info = &this_attr->c->ext_info[this_attr->address];
475 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
478 static ssize_t iio_write_channel_ext_info(struct device *dev,
479 struct device_attribute *attr,
483 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
484 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
485 const struct iio_chan_spec_ext_info *ext_info;
487 ext_info = &this_attr->c->ext_info[this_attr->address];
489 return ext_info->write(indio_dev, ext_info->private,
490 this_attr->c, buf, len);
493 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
494 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
496 const struct iio_enum *e = (const struct iio_enum *)priv;
503 for (i = 0; i < e->num_items; ++i) {
506 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
509 /* replace last space with a newline */
514 EXPORT_SYMBOL_GPL(iio_enum_available_read);
516 ssize_t iio_enum_read(struct iio_dev *indio_dev,
517 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
519 const struct iio_enum *e = (const struct iio_enum *)priv;
525 i = e->get(indio_dev, chan);
528 else if (i >= e->num_items || !e->items[i])
531 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
533 EXPORT_SYMBOL_GPL(iio_enum_read);
535 ssize_t iio_enum_write(struct iio_dev *indio_dev,
536 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
539 const struct iio_enum *e = (const struct iio_enum *)priv;
545 ret = iio_sysfs_match_string_with_gaps(e->items, e->num_items, buf);
549 ret = e->set(indio_dev, chan, ret);
550 return ret ? ret : len;
552 EXPORT_SYMBOL_GPL(iio_enum_write);
554 static const struct iio_mount_matrix iio_mount_idmatrix = {
562 static int iio_setup_mount_idmatrix(const struct device *dev,
563 struct iio_mount_matrix *matrix)
565 *matrix = iio_mount_idmatrix;
566 dev_info(dev, "mounting matrix not found: using identity...\n");
570 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
571 const struct iio_chan_spec *chan, char *buf)
573 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
574 priv)(indio_dev, chan);
580 mtx = &iio_mount_idmatrix;
582 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
583 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
584 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
585 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
587 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
590 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
591 * device "mount-matrix" property
592 * @dev: device the mounting matrix property is assigned to
593 * @propname: device specific mounting matrix property name
594 * @matrix: where to store retrieved matrix
596 * If device is assigned no mounting matrix property, a default 3x3 identity
597 * matrix will be filled in.
599 * Return: 0 if success, or a negative error code on failure.
601 int iio_read_mount_matrix(struct device *dev, const char *propname,
602 struct iio_mount_matrix *matrix)
604 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
607 err = device_property_read_string_array(dev, propname,
608 matrix->rotation, len);
613 /* Invalid number of matrix entries. */
617 /* Invalid matrix declaration format. */
620 /* Matrix was not declared at all: fallback to identity. */
621 return iio_setup_mount_idmatrix(dev, matrix);
623 EXPORT_SYMBOL(iio_read_mount_matrix);
625 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
626 int size, const int *vals)
628 unsigned long long tmp;
631 bool scale_db = false;
635 return scnprintf(buf, len, "%d", vals[0]);
636 case IIO_VAL_INT_PLUS_MICRO_DB:
639 case IIO_VAL_INT_PLUS_MICRO:
641 return scnprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
642 -vals[1], scale_db ? " dB" : "");
644 return scnprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
645 scale_db ? " dB" : "");
646 case IIO_VAL_INT_PLUS_NANO:
648 return scnprintf(buf, len, "-%d.%09u", abs(vals[0]),
651 return scnprintf(buf, len, "%d.%09u", vals[0], vals[1]);
652 case IIO_VAL_FRACTIONAL:
653 tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
655 tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1);
656 if ((tmp2 < 0) && (tmp0 == 0))
657 return snprintf(buf, len, "-0.%09u", abs(tmp1));
659 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
660 case IIO_VAL_FRACTIONAL_LOG2:
661 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
662 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
663 return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
664 case IIO_VAL_INT_MULTIPLE:
669 for (i = 0; i < size; ++i) {
670 l += scnprintf(&buf[l], len - l, "%d ", vals[i]);
677 return scnprintf(buf, len, "%c", (char)vals[0]);
684 * iio_format_value() - Formats a IIO value into its string representation
685 * @buf: The buffer to which the formatted value gets written
686 * which is assumed to be big enough (i.e. PAGE_SIZE).
687 * @type: One of the IIO_VAL_* constants. This decides how the val
688 * and val2 parameters are formatted.
689 * @size: Number of IIO value entries contained in vals
690 * @vals: Pointer to the values, exact meaning depends on the
693 * Return: 0 by default, a negative number on failure or the
694 * total number of characters written for a type that belongs
695 * to the IIO_VAL_* constant.
697 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
701 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
702 if (len >= PAGE_SIZE - 1)
705 return len + sprintf(buf + len, "\n");
707 EXPORT_SYMBOL_GPL(iio_format_value);
709 static ssize_t iio_read_channel_label(struct device *dev,
710 struct device_attribute *attr,
713 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
714 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
716 if (!indio_dev->info->read_label)
719 return indio_dev->info->read_label(indio_dev, this_attr->c, buf);
722 static ssize_t iio_read_channel_info(struct device *dev,
723 struct device_attribute *attr,
726 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
727 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
728 int vals[INDIO_MAX_RAW_ELEMENTS];
732 if (indio_dev->info->read_raw_multi)
733 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
734 INDIO_MAX_RAW_ELEMENTS,
738 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
739 &vals[0], &vals[1], this_attr->address);
744 return iio_format_value(buf, ret, val_len, vals);
747 static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
748 const char *prefix, const char *suffix)
763 len = scnprintf(buf, PAGE_SIZE, prefix);
765 for (i = 0; i <= length - stride; i += stride) {
767 len += scnprintf(buf + len, PAGE_SIZE - len, " ");
768 if (len >= PAGE_SIZE)
772 len += __iio_format_value(buf + len, PAGE_SIZE - len, type,
774 if (len >= PAGE_SIZE)
778 len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n", suffix);
783 static ssize_t iio_format_avail_list(char *buf, const int *vals,
784 int type, int length)
787 return iio_format_list(buf, vals, type, length, "", "");
790 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
792 return iio_format_list(buf, vals, type, 3, "[", "]");
795 static ssize_t iio_read_channel_info_avail(struct device *dev,
796 struct device_attribute *attr,
799 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
800 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
806 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
807 &vals, &type, &length,
814 return iio_format_avail_list(buf, vals, type, length);
815 case IIO_AVAIL_RANGE:
816 return iio_format_avail_range(buf, vals, type);
823 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
824 * @str: The string to parse
825 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
826 * @integer: The integer part of the number
827 * @fract: The fractional part of the number
828 * @scale_db: True if this should parse as dB
830 * Returns 0 on success, or a negative error code if the string could not be
833 static int __iio_str_to_fixpoint(const char *str, int fract_mult,
834 int *integer, int *fract, bool scale_db)
837 bool integer_part = true, negative = false;
839 if (fract_mult == 0) {
842 return kstrtoint(str, 0, integer);
848 } else if (str[0] == '+') {
853 if ('0' <= *str && *str <= '9') {
855 i = i * 10 + *str - '0';
857 f += fract_mult * (*str - '0');
860 } else if (*str == '\n') {
861 if (*(str + 1) == '\0')
865 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
866 /* Ignore the dB suffix */
867 str += sizeof(" dB") - 1;
869 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
870 /* Ignore the dB suffix */
871 str += sizeof("dB") - 1;
873 } else if (*str == '.' && integer_part) {
874 integer_part = false;
895 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
896 * @str: The string to parse
897 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
898 * @integer: The integer part of the number
899 * @fract: The fractional part of the number
901 * Returns 0 on success, or a negative error code if the string could not be
904 int iio_str_to_fixpoint(const char *str, int fract_mult,
905 int *integer, int *fract)
907 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
909 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
911 static ssize_t iio_write_channel_info(struct device *dev,
912 struct device_attribute *attr,
916 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
917 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
918 int ret, fract_mult = 100000;
919 int integer, fract = 0;
920 bool is_char = false;
921 bool scale_db = false;
923 /* Assumes decimal - precision based on number of digits */
924 if (!indio_dev->info->write_raw)
927 if (indio_dev->info->write_raw_get_fmt)
928 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
929 this_attr->c, this_attr->address)) {
933 case IIO_VAL_INT_PLUS_MICRO_DB:
936 case IIO_VAL_INT_PLUS_MICRO:
939 case IIO_VAL_INT_PLUS_NANO:
940 fract_mult = 100000000;
952 if (sscanf(buf, "%c", &ch) != 1)
956 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
962 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
963 integer, fract, this_attr->address);
971 int __iio_device_attr_init(struct device_attribute *dev_attr,
973 struct iio_chan_spec const *chan,
974 ssize_t (*readfunc)(struct device *dev,
975 struct device_attribute *attr,
977 ssize_t (*writefunc)(struct device *dev,
978 struct device_attribute *attr,
981 enum iio_shared_by shared_by)
986 sysfs_attr_init(&dev_attr->attr);
988 /* Build up postfix of <extend_name>_<modifier>_postfix */
989 if (chan->modified && (shared_by == IIO_SEPARATE)) {
990 if (chan->extend_name)
991 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
992 iio_modifier_names[chan
997 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
998 iio_modifier_names[chan
1002 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
1003 full_postfix = kstrdup(postfix, GFP_KERNEL);
1005 full_postfix = kasprintf(GFP_KERNEL,
1010 if (full_postfix == NULL)
1013 if (chan->differential) { /* Differential can not have modifier */
1014 switch (shared_by) {
1015 case IIO_SHARED_BY_ALL:
1016 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1018 case IIO_SHARED_BY_DIR:
1019 name = kasprintf(GFP_KERNEL, "%s_%s",
1020 iio_direction[chan->output],
1023 case IIO_SHARED_BY_TYPE:
1024 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
1025 iio_direction[chan->output],
1026 iio_chan_type_name_spec[chan->type],
1027 iio_chan_type_name_spec[chan->type],
1031 if (!chan->indexed) {
1032 WARN(1, "Differential channels must be indexed\n");
1034 goto error_free_full_postfix;
1036 name = kasprintf(GFP_KERNEL,
1038 iio_direction[chan->output],
1039 iio_chan_type_name_spec[chan->type],
1041 iio_chan_type_name_spec[chan->type],
1046 } else { /* Single ended */
1047 switch (shared_by) {
1048 case IIO_SHARED_BY_ALL:
1049 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1051 case IIO_SHARED_BY_DIR:
1052 name = kasprintf(GFP_KERNEL, "%s_%s",
1053 iio_direction[chan->output],
1056 case IIO_SHARED_BY_TYPE:
1057 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1058 iio_direction[chan->output],
1059 iio_chan_type_name_spec[chan->type],
1065 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
1066 iio_direction[chan->output],
1067 iio_chan_type_name_spec[chan->type],
1071 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1072 iio_direction[chan->output],
1073 iio_chan_type_name_spec[chan->type],
1080 goto error_free_full_postfix;
1082 dev_attr->attr.name = name;
1085 dev_attr->attr.mode |= S_IRUGO;
1086 dev_attr->show = readfunc;
1090 dev_attr->attr.mode |= S_IWUSR;
1091 dev_attr->store = writefunc;
1094 error_free_full_postfix:
1095 kfree(full_postfix);
1100 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1102 kfree(dev_attr->attr.name);
1105 int __iio_add_chan_devattr(const char *postfix,
1106 struct iio_chan_spec const *chan,
1107 ssize_t (*readfunc)(struct device *dev,
1108 struct device_attribute *attr,
1110 ssize_t (*writefunc)(struct device *dev,
1111 struct device_attribute *attr,
1115 enum iio_shared_by shared_by,
1117 struct list_head *attr_list)
1120 struct iio_dev_attr *iio_attr, *t;
1122 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1123 if (iio_attr == NULL)
1125 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1127 readfunc, writefunc, shared_by);
1129 goto error_iio_dev_attr_free;
1131 iio_attr->address = mask;
1132 list_for_each_entry(t, attr_list, l)
1133 if (strcmp(t->dev_attr.attr.name,
1134 iio_attr->dev_attr.attr.name) == 0) {
1135 if (shared_by == IIO_SEPARATE)
1136 dev_err(dev, "tried to double register : %s\n",
1137 t->dev_attr.attr.name);
1139 goto error_device_attr_deinit;
1141 list_add(&iio_attr->l, attr_list);
1145 error_device_attr_deinit:
1146 __iio_device_attr_deinit(&iio_attr->dev_attr);
1147 error_iio_dev_attr_free:
1152 static int iio_device_add_channel_label(struct iio_dev *indio_dev,
1153 struct iio_chan_spec const *chan)
1155 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1158 if (!indio_dev->info->read_label)
1161 ret = __iio_add_chan_devattr("label",
1163 &iio_read_channel_label,
1168 &iio_dev_opaque->channel_attr_list);
1175 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1176 struct iio_chan_spec const *chan,
1177 enum iio_shared_by shared_by,
1178 const long *infomask)
1180 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1181 int i, ret, attrcount = 0;
1183 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1184 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1186 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1188 &iio_read_channel_info,
1189 &iio_write_channel_info,
1193 &iio_dev_opaque->channel_attr_list);
1194 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1204 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1205 struct iio_chan_spec const *chan,
1206 enum iio_shared_by shared_by,
1207 const long *infomask)
1209 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1210 int i, ret, attrcount = 0;
1211 char *avail_postfix;
1213 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1214 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1216 avail_postfix = kasprintf(GFP_KERNEL,
1218 iio_chan_info_postfix[i]);
1222 ret = __iio_add_chan_devattr(avail_postfix,
1224 &iio_read_channel_info_avail,
1229 &iio_dev_opaque->channel_attr_list);
1230 kfree(avail_postfix);
1231 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1241 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1242 struct iio_chan_spec const *chan)
1244 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1245 int ret, attrcount = 0;
1246 const struct iio_chan_spec_ext_info *ext_info;
1248 if (chan->channel < 0)
1250 ret = iio_device_add_info_mask_type(indio_dev, chan,
1252 &chan->info_mask_separate);
1257 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1260 info_mask_separate_available);
1265 ret = iio_device_add_info_mask_type(indio_dev, chan,
1267 &chan->info_mask_shared_by_type);
1272 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1275 info_mask_shared_by_type_available);
1280 ret = iio_device_add_info_mask_type(indio_dev, chan,
1282 &chan->info_mask_shared_by_dir);
1287 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1289 &chan->info_mask_shared_by_dir_available);
1294 ret = iio_device_add_info_mask_type(indio_dev, chan,
1296 &chan->info_mask_shared_by_all);
1301 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1303 &chan->info_mask_shared_by_all_available);
1308 ret = iio_device_add_channel_label(indio_dev, chan);
1313 if (chan->ext_info) {
1315 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1316 ret = __iio_add_chan_devattr(ext_info->name,
1319 &iio_read_channel_ext_info : NULL,
1321 &iio_write_channel_ext_info : NULL,
1325 &iio_dev_opaque->channel_attr_list);
1327 if (ret == -EBUSY && ext_info->shared)
1341 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1342 * @attr_list: List of IIO device attributes
1344 * This function frees the memory allocated for each of the IIO device
1345 * attributes in the list.
1347 void iio_free_chan_devattr_list(struct list_head *attr_list)
1349 struct iio_dev_attr *p, *n;
1351 list_for_each_entry_safe(p, n, attr_list, l) {
1352 kfree(p->dev_attr.attr.name);
1358 static ssize_t iio_show_dev_name(struct device *dev,
1359 struct device_attribute *attr,
1362 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1363 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1366 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1368 static ssize_t iio_show_dev_label(struct device *dev,
1369 struct device_attribute *attr,
1372 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1373 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1376 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1378 static ssize_t iio_show_timestamp_clock(struct device *dev,
1379 struct device_attribute *attr,
1382 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1383 const clockid_t clk = iio_device_get_clock(indio_dev);
1388 case CLOCK_REALTIME:
1389 name = "realtime\n";
1390 sz = sizeof("realtime\n");
1392 case CLOCK_MONOTONIC:
1393 name = "monotonic\n";
1394 sz = sizeof("monotonic\n");
1396 case CLOCK_MONOTONIC_RAW:
1397 name = "monotonic_raw\n";
1398 sz = sizeof("monotonic_raw\n");
1400 case CLOCK_REALTIME_COARSE:
1401 name = "realtime_coarse\n";
1402 sz = sizeof("realtime_coarse\n");
1404 case CLOCK_MONOTONIC_COARSE:
1405 name = "monotonic_coarse\n";
1406 sz = sizeof("monotonic_coarse\n");
1408 case CLOCK_BOOTTIME:
1409 name = "boottime\n";
1410 sz = sizeof("boottime\n");
1414 sz = sizeof("tai\n");
1420 memcpy(buf, name, sz);
1424 static ssize_t iio_store_timestamp_clock(struct device *dev,
1425 struct device_attribute *attr,
1426 const char *buf, size_t len)
1431 if (sysfs_streq(buf, "realtime"))
1432 clk = CLOCK_REALTIME;
1433 else if (sysfs_streq(buf, "monotonic"))
1434 clk = CLOCK_MONOTONIC;
1435 else if (sysfs_streq(buf, "monotonic_raw"))
1436 clk = CLOCK_MONOTONIC_RAW;
1437 else if (sysfs_streq(buf, "realtime_coarse"))
1438 clk = CLOCK_REALTIME_COARSE;
1439 else if (sysfs_streq(buf, "monotonic_coarse"))
1440 clk = CLOCK_MONOTONIC_COARSE;
1441 else if (sysfs_streq(buf, "boottime"))
1442 clk = CLOCK_BOOTTIME;
1443 else if (sysfs_streq(buf, "tai"))
1448 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1455 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1456 iio_show_timestamp_clock, iio_store_timestamp_clock);
1458 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1460 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1461 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1462 struct iio_dev_attr *p;
1463 struct attribute **attr, *clk = NULL;
1465 /* First count elements in any existing group */
1466 if (indio_dev->info->attrs) {
1467 attr = indio_dev->info->attrs->attrs;
1468 while (*attr++ != NULL)
1471 attrcount = attrcount_orig;
1473 * New channel registration method - relies on the fact a group does
1474 * not need to be initialized if its name is NULL.
1476 if (indio_dev->channels)
1477 for (i = 0; i < indio_dev->num_channels; i++) {
1478 const struct iio_chan_spec *chan =
1479 &indio_dev->channels[i];
1481 if (chan->type == IIO_TIMESTAMP)
1482 clk = &dev_attr_current_timestamp_clock.attr;
1484 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1486 goto error_clear_attrs;
1490 if (iio_dev_opaque->event_interface)
1491 clk = &dev_attr_current_timestamp_clock.attr;
1493 if (indio_dev->name)
1495 if (indio_dev->label)
1500 iio_dev_opaque->chan_attr_group.attrs =
1501 kcalloc(attrcount + 1,
1502 sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1504 if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
1506 goto error_clear_attrs;
1508 /* Copy across original attributes */
1509 if (indio_dev->info->attrs) {
1510 memcpy(iio_dev_opaque->chan_attr_group.attrs,
1511 indio_dev->info->attrs->attrs,
1512 sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
1514 iio_dev_opaque->chan_attr_group.is_visible =
1515 indio_dev->info->attrs->is_visible;
1517 attrn = attrcount_orig;
1518 /* Add all elements from the list. */
1519 list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
1520 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1521 if (indio_dev->name)
1522 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1523 if (indio_dev->label)
1524 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
1526 iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
1528 indio_dev->groups[indio_dev->groupcounter++] =
1529 &iio_dev_opaque->chan_attr_group;
1534 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1539 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1541 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1543 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1544 kfree(iio_dev_opaque->chan_attr_group.attrs);
1545 iio_dev_opaque->chan_attr_group.attrs = NULL;
1548 static void iio_dev_release(struct device *device)
1550 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1551 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1553 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1554 iio_device_unregister_trigger_consumer(indio_dev);
1555 iio_device_unregister_eventset(indio_dev);
1556 iio_device_unregister_sysfs(indio_dev);
1558 iio_buffer_put(indio_dev->buffer);
1560 ida_simple_remove(&iio_ida, indio_dev->id);
1561 kfree(iio_dev_opaque);
1564 struct device_type iio_device_type = {
1565 .name = "iio_device",
1566 .release = iio_dev_release,
1570 * iio_device_alloc() - allocate an iio_dev from a driver
1571 * @parent: Parent device.
1572 * @sizeof_priv: Space to allocate for private structure.
1574 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
1576 struct iio_dev_opaque *iio_dev_opaque;
1577 struct iio_dev *dev;
1580 alloc_size = sizeof(struct iio_dev_opaque);
1582 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1583 alloc_size += sizeof_priv;
1586 iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1587 if (!iio_dev_opaque)
1590 dev = &iio_dev_opaque->indio_dev;
1591 dev->priv = (char *)iio_dev_opaque +
1592 ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
1594 dev->dev.parent = parent;
1595 dev->dev.groups = dev->groups;
1596 dev->dev.type = &iio_device_type;
1597 dev->dev.bus = &iio_bus_type;
1598 device_initialize(&dev->dev);
1599 dev_set_drvdata(&dev->dev, (void *)dev);
1600 mutex_init(&dev->mlock);
1601 mutex_init(&dev->info_exist_lock);
1602 INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
1604 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1606 /* cannot use a dev_err as the name isn't available */
1607 pr_err("failed to get device id\n");
1608 kfree(iio_dev_opaque);
1611 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1612 INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
1613 INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
1617 EXPORT_SYMBOL(iio_device_alloc);
1620 * iio_device_free() - free an iio_dev from a driver
1621 * @dev: the iio_dev associated with the device
1623 void iio_device_free(struct iio_dev *dev)
1626 put_device(&dev->dev);
1628 EXPORT_SYMBOL(iio_device_free);
1630 static void devm_iio_device_release(struct device *dev, void *res)
1632 iio_device_free(*(struct iio_dev **)res);
1636 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1637 * @parent: Device to allocate iio_dev for, and parent for this IIO device
1638 * @sizeof_priv: Space to allocate for private structure.
1640 * Managed iio_device_alloc. iio_dev allocated with this function is
1641 * automatically freed on driver detach.
1644 * Pointer to allocated iio_dev on success, NULL on failure.
1646 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
1648 struct iio_dev **ptr, *iio_dev;
1650 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1655 iio_dev = iio_device_alloc(parent, sizeof_priv);
1658 devres_add(parent, ptr);
1665 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1668 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1669 * @inode: Inode structure for identifying the device in the file system
1670 * @filp: File structure for iio device used to keep and later access
1673 * Return: 0 on success or -EBUSY if the device is already opened
1675 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1677 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1678 struct iio_dev, chrdev);
1680 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1683 iio_device_get(indio_dev);
1685 filp->private_data = indio_dev;
1691 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1692 * @inode: Inode structure pointer for the char device
1693 * @filp: File structure pointer for the char device
1695 * Return: 0 for successful release
1697 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1699 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1700 struct iio_dev, chrdev);
1701 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1702 iio_device_put(indio_dev);
1707 void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
1708 struct iio_ioctl_handler *h)
1710 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1712 list_add_tail(&h->entry, &iio_dev_opaque->ioctl_handlers);
1715 void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h)
1717 list_del(&h->entry);
1720 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1722 struct iio_dev *indio_dev = filp->private_data;
1723 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1724 struct iio_ioctl_handler *h;
1727 mutex_lock(&indio_dev->info_exist_lock);
1730 * The NULL check here is required to prevent crashing when a device
1731 * is being removed while userspace would still have open file handles
1732 * to try to access this device.
1734 if (!indio_dev->info)
1738 list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
1739 ret = h->ioctl(indio_dev, filp, cmd, arg);
1740 if (ret != IIO_IOCTL_UNHANDLED)
1744 if (ret == IIO_IOCTL_UNHANDLED)
1748 mutex_unlock(&indio_dev->info_exist_lock);
1753 static const struct file_operations iio_buffer_fileops = {
1754 .owner = THIS_MODULE,
1755 .llseek = noop_llseek,
1756 .read = iio_buffer_read_outer_addr,
1757 .poll = iio_buffer_poll_addr,
1758 .unlocked_ioctl = iio_ioctl,
1759 .compat_ioctl = compat_ptr_ioctl,
1760 .open = iio_chrdev_open,
1761 .release = iio_chrdev_release,
1764 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1767 const struct iio_chan_spec *channels = indio_dev->channels;
1769 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1772 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1773 if (channels[i].scan_index < 0)
1775 for (j = i + 1; j < indio_dev->num_channels; j++)
1776 if (channels[i].scan_index == channels[j].scan_index) {
1777 dev_err(&indio_dev->dev,
1778 "Duplicate scan index %d\n",
1779 channels[i].scan_index);
1787 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1789 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1793 if (!indio_dev->info)
1796 indio_dev->driver_module = this_mod;
1797 /* If the calling driver did not initialize of_node, do it here */
1798 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1799 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1801 indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1804 ret = iio_check_unique_scan_index(indio_dev);
1808 /* configure elements for the chrdev */
1809 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1811 iio_device_register_debugfs(indio_dev);
1813 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1815 dev_err(indio_dev->dev.parent,
1816 "Failed to create buffer sysfs interfaces\n");
1817 goto error_unreg_debugfs;
1820 ret = iio_device_register_sysfs(indio_dev);
1822 dev_err(indio_dev->dev.parent,
1823 "Failed to register sysfs interfaces\n");
1824 goto error_buffer_free_sysfs;
1826 ret = iio_device_register_eventset(indio_dev);
1828 dev_err(indio_dev->dev.parent,
1829 "Failed to register event set\n");
1830 goto error_free_sysfs;
1832 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1833 iio_device_register_trigger_consumer(indio_dev);
1835 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1836 indio_dev->setup_ops == NULL)
1837 indio_dev->setup_ops = &noop_ring_setup_ops;
1839 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1841 indio_dev->chrdev.owner = this_mod;
1843 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1845 goto error_unreg_eventset;
1849 error_unreg_eventset:
1850 iio_device_unregister_eventset(indio_dev);
1852 iio_device_unregister_sysfs(indio_dev);
1853 error_buffer_free_sysfs:
1854 iio_buffer_free_sysfs_and_mask(indio_dev);
1855 error_unreg_debugfs:
1856 iio_device_unregister_debugfs(indio_dev);
1859 EXPORT_SYMBOL(__iio_device_register);
1862 * iio_device_unregister() - unregister a device from the IIO subsystem
1863 * @indio_dev: Device structure representing the device.
1865 void iio_device_unregister(struct iio_dev *indio_dev)
1867 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1868 struct iio_ioctl_handler *h, *t;
1870 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1872 mutex_lock(&indio_dev->info_exist_lock);
1874 iio_device_unregister_debugfs(indio_dev);
1876 iio_disable_all_buffers(indio_dev);
1878 indio_dev->info = NULL;
1880 list_for_each_entry_safe(h, t, &iio_dev_opaque->ioctl_handlers, entry)
1881 list_del(&h->entry);
1883 iio_device_wakeup_eventset(indio_dev);
1884 iio_buffer_wakeup_poll(indio_dev);
1886 mutex_unlock(&indio_dev->info_exist_lock);
1888 iio_buffer_free_sysfs_and_mask(indio_dev);
1890 EXPORT_SYMBOL(iio_device_unregister);
1892 static void devm_iio_device_unreg(struct device *dev, void *res)
1894 iio_device_unregister(*(struct iio_dev **)res);
1897 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1898 struct module *this_mod)
1900 struct iio_dev **ptr;
1903 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1908 ret = __iio_device_register(indio_dev, this_mod);
1910 devres_add(dev, ptr);
1916 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1919 * iio_device_claim_direct_mode - Keep device in direct mode
1920 * @indio_dev: the iio_dev associated with the device
1922 * If the device is in direct mode it is guaranteed to stay
1923 * that way until iio_device_release_direct_mode() is called.
1925 * Use with iio_device_release_direct_mode()
1927 * Returns: 0 on success, -EBUSY on failure
1929 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1931 mutex_lock(&indio_dev->mlock);
1933 if (iio_buffer_enabled(indio_dev)) {
1934 mutex_unlock(&indio_dev->mlock);
1939 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1942 * iio_device_release_direct_mode - releases claim on direct mode
1943 * @indio_dev: the iio_dev associated with the device
1945 * Release the claim. Device is no longer guaranteed to stay
1948 * Use with iio_device_claim_direct_mode()
1950 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1952 mutex_unlock(&indio_dev->mlock);
1954 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1956 subsys_initcall(iio_init);
1957 module_exit(iio_exit);
1959 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1960 MODULE_DESCRIPTION("Industrial I/O core");
1961 MODULE_LICENSE("GPL");