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Merge tag 'nfs-for-5.10-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
[mirror_ubuntu-hirsute-kernel.git] / drivers / iio / industrialio-core.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* The industrial I/O core
3 *
4 * Copyright (c) 2008 Jonathan Cameron
5 *
6 * Based on elements of hwmon and input subsystems.
7 */
8
9 #define pr_fmt(fmt) "iio-core: " fmt
10
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>
17 #include <linux/fs.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>
29 #include "iio_core.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>
35
36 /* IDA to assign each registered device a unique id */
37 static DEFINE_IDA(iio_ida);
38
39 static dev_t iio_devt;
40
41 #define IIO_DEV_MAX 256
42 struct bus_type iio_bus_type = {
43 .name = "iio",
44 };
45 EXPORT_SYMBOL(iio_bus_type);
46
47 static struct dentry *iio_debugfs_dentry;
48
49 static const char * const iio_direction[] = {
50 [0] = "in",
51 [1] = "out",
52 };
53
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",
60 [IIO_MAGN] = "magn",
61 [IIO_LIGHT] = "illuminance",
62 [IIO_INTENSITY] = "intensity",
63 [IIO_PROXIMITY] = "proximity",
64 [IIO_TEMP] = "temp",
65 [IIO_INCLI] = "incli",
66 [IIO_ROT] = "rot",
67 [IIO_ANGL] = "angl",
68 [IIO_TIMESTAMP] = "timestamp",
69 [IIO_CAPACITANCE] = "capacitance",
70 [IIO_ALTVOLTAGE] = "altvoltage",
71 [IIO_CCT] = "cct",
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",
81 [IIO_PH] = "ph",
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",
90 };
91
92 static const char * const iio_modifier_names[] = {
93 [IIO_MOD_X] = "x",
94 [IIO_MOD_Y] = "y",
95 [IIO_MOD_Z] = "z",
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)",
126 [IIO_MOD_I] = "i",
127 [IIO_MOD_Q] = "q",
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",
135 [IIO_MOD_H2] = "h2",
136 [IIO_MOD_O2] = "o2",
137 };
138
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",
170 };
171
172 #if defined(CONFIG_DEBUG_FS)
173 /*
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
176 */
177 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
178 {
179 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
180 return iio_dev_opaque->debugfs_dentry;
181 }
182 EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
183 #endif
184
185 /**
186 * iio_find_channel_from_si() - get channel from its scan index
187 * @indio_dev: device
188 * @si: scan index to match
189 */
190 const struct iio_chan_spec
191 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
192 {
193 int i;
194
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];
198 return NULL;
199 }
200
201 /* This turns up an awful lot */
202 ssize_t iio_read_const_attr(struct device *dev,
203 struct device_attribute *attr,
204 char *buf)
205 {
206 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
207 }
208 EXPORT_SYMBOL(iio_read_const_attr);
209
210 /**
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.
214 */
215 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
216 {
217 int ret;
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;
220
221 ret = mutex_lock_interruptible(&indio_dev->mlock);
222 if (ret)
223 return ret;
224 if ((ev_int && iio_event_enabled(ev_int)) ||
225 iio_buffer_enabled(indio_dev)) {
226 mutex_unlock(&indio_dev->mlock);
227 return -EBUSY;
228 }
229 indio_dev->clock_id = clock_id;
230 mutex_unlock(&indio_dev->mlock);
231
232 return 0;
233 }
234 EXPORT_SYMBOL(iio_device_set_clock);
235
236 /**
237 * iio_get_time_ns() - utility function to get a time stamp for events etc
238 * @indio_dev: device
239 */
240 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
241 {
242 struct timespec64 tp;
243
244 switch (iio_device_get_clock(indio_dev)) {
245 case CLOCK_REALTIME:
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);
256 case CLOCK_BOOTTIME:
257 return ktime_get_boottime_ns();
258 case CLOCK_TAI:
259 return ktime_get_clocktai_ns();
260 default:
261 BUG();
262 }
263 }
264 EXPORT_SYMBOL(iio_get_time_ns);
265
266 /**
267 * iio_get_time_res() - utility function to get time stamp clock resolution in
268 * nano seconds.
269 * @indio_dev: device
270 */
271 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
272 {
273 switch (iio_device_get_clock(indio_dev)) {
274 case CLOCK_REALTIME:
275 case CLOCK_MONOTONIC:
276 case CLOCK_MONOTONIC_RAW:
277 case CLOCK_BOOTTIME:
278 case CLOCK_TAI:
279 return hrtimer_resolution;
280 case CLOCK_REALTIME_COARSE:
281 case CLOCK_MONOTONIC_COARSE:
282 return LOW_RES_NSEC;
283 default:
284 BUG();
285 }
286 }
287 EXPORT_SYMBOL(iio_get_time_res);
288
289 static int __init iio_init(void)
290 {
291 int ret;
292
293 /* Register sysfs bus */
294 ret = bus_register(&iio_bus_type);
295 if (ret < 0) {
296 pr_err("could not register bus type\n");
297 goto error_nothing;
298 }
299
300 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
301 if (ret < 0) {
302 pr_err("failed to allocate char dev region\n");
303 goto error_unregister_bus_type;
304 }
305
306 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
307
308 return 0;
309
310 error_unregister_bus_type:
311 bus_unregister(&iio_bus_type);
312 error_nothing:
313 return ret;
314 }
315
316 static void __exit iio_exit(void)
317 {
318 if (iio_devt)
319 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
320 bus_unregister(&iio_bus_type);
321 debugfs_remove(iio_debugfs_dentry);
322 }
323
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)
327 {
328 struct iio_dev *indio_dev = file->private_data;
329 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
330 unsigned val = 0;
331 int ret;
332
333 if (*ppos > 0)
334 return simple_read_from_buffer(userbuf, count, ppos,
335 iio_dev_opaque->read_buf,
336 iio_dev_opaque->read_buf_len);
337
338 ret = indio_dev->info->debugfs_reg_access(indio_dev,
339 iio_dev_opaque->cached_reg_addr,
340 0, &val);
341 if (ret) {
342 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
343 return ret;
344 }
345
346 iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
347 sizeof(iio_dev_opaque->read_buf),
348 "0x%X\n", val);
349
350 return simple_read_from_buffer(userbuf, count, ppos,
351 iio_dev_opaque->read_buf,
352 iio_dev_opaque->read_buf_len);
353 }
354
355 static ssize_t iio_debugfs_write_reg(struct file *file,
356 const char __user *userbuf, size_t count, loff_t *ppos)
357 {
358 struct iio_dev *indio_dev = file->private_data;
359 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
360 unsigned reg, val;
361 char buf[80];
362 int ret;
363
364 count = min_t(size_t, count, (sizeof(buf)-1));
365 if (copy_from_user(buf, userbuf, count))
366 return -EFAULT;
367
368 buf[count] = 0;
369
370 ret = sscanf(buf, "%i %i", &reg, &val);
371
372 switch (ret) {
373 case 1:
374 iio_dev_opaque->cached_reg_addr = reg;
375 break;
376 case 2:
377 iio_dev_opaque->cached_reg_addr = reg;
378 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
379 val, NULL);
380 if (ret) {
381 dev_err(indio_dev->dev.parent, "%s: write failed\n",
382 __func__);
383 return ret;
384 }
385 break;
386 default:
387 return -EINVAL;
388 }
389
390 return count;
391 }
392
393 static const struct file_operations iio_debugfs_reg_fops = {
394 .open = simple_open,
395 .read = iio_debugfs_read_reg,
396 .write = iio_debugfs_write_reg,
397 };
398
399 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
400 {
401 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
402 debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
403 }
404
405 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
406 {
407 struct iio_dev_opaque *iio_dev_opaque;
408
409 if (indio_dev->info->debugfs_reg_access == NULL)
410 return;
411
412 if (!iio_debugfs_dentry)
413 return;
414
415 iio_dev_opaque = to_iio_dev_opaque(indio_dev);
416
417 iio_dev_opaque->debugfs_dentry =
418 debugfs_create_dir(dev_name(&indio_dev->dev),
419 iio_debugfs_dentry);
420
421 debugfs_create_file("direct_reg_access", 0644,
422 iio_dev_opaque->debugfs_dentry, indio_dev,
423 &iio_debugfs_reg_fops);
424 }
425 #else
426 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
427 {
428 }
429
430 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
431 {
432 }
433 #endif /* CONFIG_DEBUG_FS */
434
435 static ssize_t iio_read_channel_ext_info(struct device *dev,
436 struct device_attribute *attr,
437 char *buf)
438 {
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;
442
443 ext_info = &this_attr->c->ext_info[this_attr->address];
444
445 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
446 }
447
448 static ssize_t iio_write_channel_ext_info(struct device *dev,
449 struct device_attribute *attr,
450 const char *buf,
451 size_t len)
452 {
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;
456
457 ext_info = &this_attr->c->ext_info[this_attr->address];
458
459 return ext_info->write(indio_dev, ext_info->private,
460 this_attr->c, buf, len);
461 }
462
463 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
464 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
465 {
466 const struct iio_enum *e = (const struct iio_enum *)priv;
467 unsigned int i;
468 size_t len = 0;
469
470 if (!e->num_items)
471 return 0;
472
473 for (i = 0; i < e->num_items; ++i)
474 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
475
476 /* replace last space with a newline */
477 buf[len - 1] = '\n';
478
479 return len;
480 }
481 EXPORT_SYMBOL_GPL(iio_enum_available_read);
482
483 ssize_t iio_enum_read(struct iio_dev *indio_dev,
484 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
485 {
486 const struct iio_enum *e = (const struct iio_enum *)priv;
487 int i;
488
489 if (!e->get)
490 return -EINVAL;
491
492 i = e->get(indio_dev, chan);
493 if (i < 0)
494 return i;
495 else if (i >= e->num_items)
496 return -EINVAL;
497
498 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
499 }
500 EXPORT_SYMBOL_GPL(iio_enum_read);
501
502 ssize_t iio_enum_write(struct iio_dev *indio_dev,
503 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
504 size_t len)
505 {
506 const struct iio_enum *e = (const struct iio_enum *)priv;
507 int ret;
508
509 if (!e->set)
510 return -EINVAL;
511
512 ret = __sysfs_match_string(e->items, e->num_items, buf);
513 if (ret < 0)
514 return ret;
515
516 ret = e->set(indio_dev, chan, ret);
517 return ret ? ret : len;
518 }
519 EXPORT_SYMBOL_GPL(iio_enum_write);
520
521 static const struct iio_mount_matrix iio_mount_idmatrix = {
522 .rotation = {
523 "1", "0", "0",
524 "0", "1", "0",
525 "0", "0", "1"
526 }
527 };
528
529 static int iio_setup_mount_idmatrix(const struct device *dev,
530 struct iio_mount_matrix *matrix)
531 {
532 *matrix = iio_mount_idmatrix;
533 dev_info(dev, "mounting matrix not found: using identity...\n");
534 return 0;
535 }
536
537 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
538 const struct iio_chan_spec *chan, char *buf)
539 {
540 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
541 priv)(indio_dev, chan);
542
543 if (IS_ERR(mtx))
544 return PTR_ERR(mtx);
545
546 if (!mtx)
547 mtx = &iio_mount_idmatrix;
548
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]);
553 }
554 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
555
556 /**
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
562 *
563 * If device is assigned no mounting matrix property, a default 3x3 identity
564 * matrix will be filled in.
565 *
566 * Return: 0 if success, or a negative error code on failure.
567 */
568 int iio_read_mount_matrix(struct device *dev, const char *propname,
569 struct iio_mount_matrix *matrix)
570 {
571 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
572 int err;
573
574 err = device_property_read_string_array(dev, propname,
575 matrix->rotation, len);
576 if (err == len)
577 return 0;
578
579 if (err >= 0)
580 /* Invalid number of matrix entries. */
581 return -EINVAL;
582
583 if (err != -EINVAL)
584 /* Invalid matrix declaration format. */
585 return err;
586
587 /* Matrix was not declared at all: fallback to identity. */
588 return iio_setup_mount_idmatrix(dev, matrix);
589 }
590 EXPORT_SYMBOL(iio_read_mount_matrix);
591
592 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
593 int size, const int *vals)
594 {
595 unsigned long long tmp;
596 int tmp0, tmp1;
597 bool scale_db = false;
598
599 switch (type) {
600 case IIO_VAL_INT:
601 return scnprintf(buf, len, "%d", vals[0]);
602 case IIO_VAL_INT_PLUS_MICRO_DB:
603 scale_db = true;
604 fallthrough;
605 case IIO_VAL_INT_PLUS_MICRO:
606 if (vals[1] < 0)
607 return scnprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
608 -vals[1], scale_db ? " dB" : "");
609 else
610 return scnprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
611 scale_db ? " dB" : "");
612 case IIO_VAL_INT_PLUS_NANO:
613 if (vals[1] < 0)
614 return scnprintf(buf, len, "-%d.%09u", abs(vals[0]),
615 -vals[1]);
616 else
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]);
620 tmp1 = 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:
628 {
629 int i;
630 int l = 0;
631
632 for (i = 0; i < size; ++i) {
633 l += scnprintf(&buf[l], len - l, "%d ", vals[i]);
634 if (l >= len)
635 break;
636 }
637 return l;
638 }
639 case IIO_VAL_CHAR:
640 return scnprintf(buf, len, "%c", (char)vals[0]);
641 default:
642 return 0;
643 }
644 }
645
646 /**
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
654 * type parameter.
655 *
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.
659 */
660 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
661 {
662 ssize_t len;
663
664 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
665 if (len >= PAGE_SIZE - 1)
666 return -EFBIG;
667
668 return len + sprintf(buf + len, "\n");
669 }
670 EXPORT_SYMBOL_GPL(iio_format_value);
671
672 static ssize_t iio_read_channel_info(struct device *dev,
673 struct device_attribute *attr,
674 char *buf)
675 {
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];
679 int ret;
680 int val_len = 2;
681
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,
685 vals, &val_len,
686 this_attr->address);
687 else
688 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
689 &vals[0], &vals[1], this_attr->address);
690
691 if (ret < 0)
692 return ret;
693
694 return iio_format_value(buf, ret, val_len, vals);
695 }
696
697 static ssize_t iio_format_avail_list(char *buf, const int *vals,
698 int type, int length)
699 {
700 int i;
701 ssize_t len = 0;
702
703 switch (type) {
704 case IIO_VAL_INT:
705 for (i = 0; i < length; i++) {
706 len += __iio_format_value(buf + len, PAGE_SIZE - len,
707 type, 1, &vals[i]);
708 if (len >= PAGE_SIZE)
709 return -EFBIG;
710 if (i < length - 1)
711 len += scnprintf(buf + len, PAGE_SIZE - len,
712 " ");
713 else
714 len += scnprintf(buf + len, PAGE_SIZE - len,
715 "\n");
716 if (len >= PAGE_SIZE)
717 return -EFBIG;
718 }
719 break;
720 default:
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)
725 return -EFBIG;
726 if (i < length / 2 - 1)
727 len += scnprintf(buf + len, PAGE_SIZE - len,
728 " ");
729 else
730 len += scnprintf(buf + len, PAGE_SIZE - len,
731 "\n");
732 if (len >= PAGE_SIZE)
733 return -EFBIG;
734 }
735 }
736
737 return len;
738 }
739
740 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
741 {
742 int i;
743 ssize_t len;
744
745 len = snprintf(buf, PAGE_SIZE, "[");
746 switch (type) {
747 case IIO_VAL_INT:
748 for (i = 0; i < 3; i++) {
749 len += __iio_format_value(buf + len, PAGE_SIZE - len,
750 type, 1, &vals[i]);
751 if (len >= PAGE_SIZE)
752 return -EFBIG;
753 if (i < 2)
754 len += scnprintf(buf + len, PAGE_SIZE - len,
755 " ");
756 else
757 len += scnprintf(buf + len, PAGE_SIZE - len,
758 "]\n");
759 if (len >= PAGE_SIZE)
760 return -EFBIG;
761 }
762 break;
763 default:
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)
768 return -EFBIG;
769 if (i < 2)
770 len += scnprintf(buf + len, PAGE_SIZE - len,
771 " ");
772 else
773 len += scnprintf(buf + len, PAGE_SIZE - len,
774 "]\n");
775 if (len >= PAGE_SIZE)
776 return -EFBIG;
777 }
778 }
779
780 return len;
781 }
782
783 static ssize_t iio_read_channel_info_avail(struct device *dev,
784 struct device_attribute *attr,
785 char *buf)
786 {
787 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
788 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
789 const int *vals;
790 int ret;
791 int length;
792 int type;
793
794 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
795 &vals, &type, &length,
796 this_attr->address);
797
798 if (ret < 0)
799 return ret;
800 switch (ret) {
801 case IIO_AVAIL_LIST:
802 return iio_format_avail_list(buf, vals, type, length);
803 case IIO_AVAIL_RANGE:
804 return iio_format_avail_range(buf, vals, type);
805 default:
806 return -EINVAL;
807 }
808 }
809
810 /**
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
817 *
818 * Returns 0 on success, or a negative error code if the string could not be
819 * parsed.
820 */
821 static int __iio_str_to_fixpoint(const char *str, int fract_mult,
822 int *integer, int *fract, bool scale_db)
823 {
824 int i = 0, f = 0;
825 bool integer_part = true, negative = false;
826
827 if (fract_mult == 0) {
828 *fract = 0;
829
830 return kstrtoint(str, 0, integer);
831 }
832
833 if (str[0] == '-') {
834 negative = true;
835 str++;
836 } else if (str[0] == '+') {
837 str++;
838 }
839
840 while (*str) {
841 if ('0' <= *str && *str <= '9') {
842 if (integer_part) {
843 i = i * 10 + *str - '0';
844 } else {
845 f += fract_mult * (*str - '0');
846 fract_mult /= 10;
847 }
848 } else if (*str == '\n') {
849 if (*(str + 1) == '\0')
850 break;
851 else
852 return -EINVAL;
853 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
854 /* Ignore the dB suffix */
855 str += sizeof(" dB") - 1;
856 continue;
857 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
858 /* Ignore the dB suffix */
859 str += sizeof("dB") - 1;
860 continue;
861 } else if (*str == '.' && integer_part) {
862 integer_part = false;
863 } else {
864 return -EINVAL;
865 }
866 str++;
867 }
868
869 if (negative) {
870 if (i)
871 i = -i;
872 else
873 f = -f;
874 }
875
876 *integer = i;
877 *fract = f;
878
879 return 0;
880 }
881
882 /**
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
888 *
889 * Returns 0 on success, or a negative error code if the string could not be
890 * parsed.
891 */
892 int iio_str_to_fixpoint(const char *str, int fract_mult,
893 int *integer, int *fract)
894 {
895 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
896 }
897 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
898
899 static ssize_t iio_write_channel_info(struct device *dev,
900 struct device_attribute *attr,
901 const char *buf,
902 size_t len)
903 {
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;
910
911 /* Assumes decimal - precision based on number of digits */
912 if (!indio_dev->info->write_raw)
913 return -EINVAL;
914
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)) {
918 case IIO_VAL_INT:
919 fract_mult = 0;
920 break;
921 case IIO_VAL_INT_PLUS_MICRO_DB:
922 scale_db = true;
923 fallthrough;
924 case IIO_VAL_INT_PLUS_MICRO:
925 fract_mult = 100000;
926 break;
927 case IIO_VAL_INT_PLUS_NANO:
928 fract_mult = 100000000;
929 break;
930 case IIO_VAL_CHAR:
931 is_char = true;
932 break;
933 default:
934 return -EINVAL;
935 }
936
937 if (is_char) {
938 char ch;
939
940 if (sscanf(buf, "%c", &ch) != 1)
941 return -EINVAL;
942 integer = ch;
943 } else {
944 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
945 scale_db);
946 if (ret)
947 return ret;
948 }
949
950 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
951 integer, fract, this_attr->address);
952 if (ret)
953 return ret;
954
955 return len;
956 }
957
958 static
959 int __iio_device_attr_init(struct device_attribute *dev_attr,
960 const char *postfix,
961 struct iio_chan_spec const *chan,
962 ssize_t (*readfunc)(struct device *dev,
963 struct device_attribute *attr,
964 char *buf),
965 ssize_t (*writefunc)(struct device *dev,
966 struct device_attribute *attr,
967 const char *buf,
968 size_t len),
969 enum iio_shared_by shared_by)
970 {
971 int ret = 0;
972 char *name = NULL;
973 char *full_postfix;
974 sysfs_attr_init(&dev_attr->attr);
975
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
981 ->channel2],
982 chan->extend_name,
983 postfix);
984 else
985 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
986 iio_modifier_names[chan
987 ->channel2],
988 postfix);
989 } else {
990 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
991 full_postfix = kstrdup(postfix, GFP_KERNEL);
992 else
993 full_postfix = kasprintf(GFP_KERNEL,
994 "%s_%s",
995 chan->extend_name,
996 postfix);
997 }
998 if (full_postfix == NULL)
999 return -ENOMEM;
1000
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);
1005 break;
1006 case IIO_SHARED_BY_DIR:
1007 name = kasprintf(GFP_KERNEL, "%s_%s",
1008 iio_direction[chan->output],
1009 full_postfix);
1010 break;
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],
1016 full_postfix);
1017 break;
1018 case IIO_SEPARATE:
1019 if (!chan->indexed) {
1020 WARN(1, "Differential channels must be indexed\n");
1021 ret = -EINVAL;
1022 goto error_free_full_postfix;
1023 }
1024 name = kasprintf(GFP_KERNEL,
1025 "%s_%s%d-%s%d_%s",
1026 iio_direction[chan->output],
1027 iio_chan_type_name_spec[chan->type],
1028 chan->channel,
1029 iio_chan_type_name_spec[chan->type],
1030 chan->channel2,
1031 full_postfix);
1032 break;
1033 }
1034 } else { /* Single ended */
1035 switch (shared_by) {
1036 case IIO_SHARED_BY_ALL:
1037 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1038 break;
1039 case IIO_SHARED_BY_DIR:
1040 name = kasprintf(GFP_KERNEL, "%s_%s",
1041 iio_direction[chan->output],
1042 full_postfix);
1043 break;
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],
1048 full_postfix);
1049 break;
1050
1051 case IIO_SEPARATE:
1052 if (chan->indexed)
1053 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
1054 iio_direction[chan->output],
1055 iio_chan_type_name_spec[chan->type],
1056 chan->channel,
1057 full_postfix);
1058 else
1059 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1060 iio_direction[chan->output],
1061 iio_chan_type_name_spec[chan->type],
1062 full_postfix);
1063 break;
1064 }
1065 }
1066 if (name == NULL) {
1067 ret = -ENOMEM;
1068 goto error_free_full_postfix;
1069 }
1070 dev_attr->attr.name = name;
1071
1072 if (readfunc) {
1073 dev_attr->attr.mode |= S_IRUGO;
1074 dev_attr->show = readfunc;
1075 }
1076
1077 if (writefunc) {
1078 dev_attr->attr.mode |= S_IWUSR;
1079 dev_attr->store = writefunc;
1080 }
1081
1082 error_free_full_postfix:
1083 kfree(full_postfix);
1084
1085 return ret;
1086 }
1087
1088 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1089 {
1090 kfree(dev_attr->attr.name);
1091 }
1092
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,
1097 char *buf),
1098 ssize_t (*writefunc)(struct device *dev,
1099 struct device_attribute *attr,
1100 const char *buf,
1101 size_t len),
1102 u64 mask,
1103 enum iio_shared_by shared_by,
1104 struct device *dev,
1105 struct list_head *attr_list)
1106 {
1107 int ret;
1108 struct iio_dev_attr *iio_attr, *t;
1109
1110 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1111 if (iio_attr == NULL)
1112 return -ENOMEM;
1113 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1114 postfix, chan,
1115 readfunc, writefunc, shared_by);
1116 if (ret)
1117 goto error_iio_dev_attr_free;
1118 iio_attr->c = chan;
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);
1126 ret = -EBUSY;
1127 goto error_device_attr_deinit;
1128 }
1129 list_add(&iio_attr->l, attr_list);
1130
1131 return 0;
1132
1133 error_device_attr_deinit:
1134 __iio_device_attr_deinit(&iio_attr->dev_attr);
1135 error_iio_dev_attr_free:
1136 kfree(iio_attr);
1137 return ret;
1138 }
1139
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)
1144 {
1145 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1146 int i, ret, attrcount = 0;
1147
1148 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1149 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1150 return -EINVAL;
1151 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1152 chan,
1153 &iio_read_channel_info,
1154 &iio_write_channel_info,
1155 i,
1156 shared_by,
1157 &indio_dev->dev,
1158 &iio_dev_opaque->channel_attr_list);
1159 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1160 continue;
1161 else if (ret < 0)
1162 return ret;
1163 attrcount++;
1164 }
1165
1166 return attrcount;
1167 }
1168
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)
1173 {
1174 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1175 int i, ret, attrcount = 0;
1176 char *avail_postfix;
1177
1178 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1179 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1180 return -EINVAL;
1181 avail_postfix = kasprintf(GFP_KERNEL,
1182 "%s_available",
1183 iio_chan_info_postfix[i]);
1184 if (!avail_postfix)
1185 return -ENOMEM;
1186
1187 ret = __iio_add_chan_devattr(avail_postfix,
1188 chan,
1189 &iio_read_channel_info_avail,
1190 NULL,
1191 i,
1192 shared_by,
1193 &indio_dev->dev,
1194 &iio_dev_opaque->channel_attr_list);
1195 kfree(avail_postfix);
1196 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1197 continue;
1198 else if (ret < 0)
1199 return ret;
1200 attrcount++;
1201 }
1202
1203 return attrcount;
1204 }
1205
1206 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1207 struct iio_chan_spec const *chan)
1208 {
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;
1212
1213 if (chan->channel < 0)
1214 return 0;
1215 ret = iio_device_add_info_mask_type(indio_dev, chan,
1216 IIO_SEPARATE,
1217 &chan->info_mask_separate);
1218 if (ret < 0)
1219 return ret;
1220 attrcount += ret;
1221
1222 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1223 IIO_SEPARATE,
1224 &chan->
1225 info_mask_separate_available);
1226 if (ret < 0)
1227 return ret;
1228 attrcount += ret;
1229
1230 ret = iio_device_add_info_mask_type(indio_dev, chan,
1231 IIO_SHARED_BY_TYPE,
1232 &chan->info_mask_shared_by_type);
1233 if (ret < 0)
1234 return ret;
1235 attrcount += ret;
1236
1237 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1238 IIO_SHARED_BY_TYPE,
1239 &chan->
1240 info_mask_shared_by_type_available);
1241 if (ret < 0)
1242 return ret;
1243 attrcount += ret;
1244
1245 ret = iio_device_add_info_mask_type(indio_dev, chan,
1246 IIO_SHARED_BY_DIR,
1247 &chan->info_mask_shared_by_dir);
1248 if (ret < 0)
1249 return ret;
1250 attrcount += ret;
1251
1252 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1253 IIO_SHARED_BY_DIR,
1254 &chan->info_mask_shared_by_dir_available);
1255 if (ret < 0)
1256 return ret;
1257 attrcount += ret;
1258
1259 ret = iio_device_add_info_mask_type(indio_dev, chan,
1260 IIO_SHARED_BY_ALL,
1261 &chan->info_mask_shared_by_all);
1262 if (ret < 0)
1263 return ret;
1264 attrcount += ret;
1265
1266 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1267 IIO_SHARED_BY_ALL,
1268 &chan->info_mask_shared_by_all_available);
1269 if (ret < 0)
1270 return ret;
1271 attrcount += ret;
1272
1273 if (chan->ext_info) {
1274 unsigned int i = 0;
1275 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1276 ret = __iio_add_chan_devattr(ext_info->name,
1277 chan,
1278 ext_info->read ?
1279 &iio_read_channel_ext_info : NULL,
1280 ext_info->write ?
1281 &iio_write_channel_ext_info : NULL,
1282 i,
1283 ext_info->shared,
1284 &indio_dev->dev,
1285 &iio_dev_opaque->channel_attr_list);
1286 i++;
1287 if (ret == -EBUSY && ext_info->shared)
1288 continue;
1289
1290 if (ret)
1291 return ret;
1292
1293 attrcount++;
1294 }
1295 }
1296
1297 return attrcount;
1298 }
1299
1300 /**
1301 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1302 * @attr_list: List of IIO device attributes
1303 *
1304 * This function frees the memory allocated for each of the IIO device
1305 * attributes in the list.
1306 */
1307 void iio_free_chan_devattr_list(struct list_head *attr_list)
1308 {
1309 struct iio_dev_attr *p, *n;
1310
1311 list_for_each_entry_safe(p, n, attr_list, l) {
1312 kfree(p->dev_attr.attr.name);
1313 list_del(&p->l);
1314 kfree(p);
1315 }
1316 }
1317
1318 static ssize_t iio_show_dev_name(struct device *dev,
1319 struct device_attribute *attr,
1320 char *buf)
1321 {
1322 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1323 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1324 }
1325
1326 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1327
1328 static ssize_t iio_show_dev_label(struct device *dev,
1329 struct device_attribute *attr,
1330 char *buf)
1331 {
1332 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1333 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1334 }
1335
1336 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1337
1338 static ssize_t iio_show_timestamp_clock(struct device *dev,
1339 struct device_attribute *attr,
1340 char *buf)
1341 {
1342 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1343 const clockid_t clk = iio_device_get_clock(indio_dev);
1344 const char *name;
1345 ssize_t sz;
1346
1347 switch (clk) {
1348 case CLOCK_REALTIME:
1349 name = "realtime\n";
1350 sz = sizeof("realtime\n");
1351 break;
1352 case CLOCK_MONOTONIC:
1353 name = "monotonic\n";
1354 sz = sizeof("monotonic\n");
1355 break;
1356 case CLOCK_MONOTONIC_RAW:
1357 name = "monotonic_raw\n";
1358 sz = sizeof("monotonic_raw\n");
1359 break;
1360 case CLOCK_REALTIME_COARSE:
1361 name = "realtime_coarse\n";
1362 sz = sizeof("realtime_coarse\n");
1363 break;
1364 case CLOCK_MONOTONIC_COARSE:
1365 name = "monotonic_coarse\n";
1366 sz = sizeof("monotonic_coarse\n");
1367 break;
1368 case CLOCK_BOOTTIME:
1369 name = "boottime\n";
1370 sz = sizeof("boottime\n");
1371 break;
1372 case CLOCK_TAI:
1373 name = "tai\n";
1374 sz = sizeof("tai\n");
1375 break;
1376 default:
1377 BUG();
1378 }
1379
1380 memcpy(buf, name, sz);
1381 return sz;
1382 }
1383
1384 static ssize_t iio_store_timestamp_clock(struct device *dev,
1385 struct device_attribute *attr,
1386 const char *buf, size_t len)
1387 {
1388 clockid_t clk;
1389 int ret;
1390
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"))
1404 clk = CLOCK_TAI;
1405 else
1406 return -EINVAL;
1407
1408 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1409 if (ret)
1410 return ret;
1411
1412 return len;
1413 }
1414
1415 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1416 iio_show_timestamp_clock, iio_store_timestamp_clock);
1417
1418 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1419 {
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;
1424
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)
1429 attrcount_orig++;
1430 }
1431 attrcount = attrcount_orig;
1432 /*
1433 * New channel registration method - relies on the fact a group does
1434 * not need to be initialized if its name is NULL.
1435 */
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];
1440
1441 if (chan->type == IIO_TIMESTAMP)
1442 clk = &dev_attr_current_timestamp_clock.attr;
1443
1444 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1445 if (ret < 0)
1446 goto error_clear_attrs;
1447 attrcount += ret;
1448 }
1449
1450 if (iio_dev_opaque->event_interface)
1451 clk = &dev_attr_current_timestamp_clock.attr;
1452
1453 if (indio_dev->name)
1454 attrcount++;
1455 if (indio_dev->label)
1456 attrcount++;
1457 if (clk)
1458 attrcount++;
1459
1460 iio_dev_opaque->chan_attr_group.attrs =
1461 kcalloc(attrcount + 1,
1462 sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1463 GFP_KERNEL);
1464 if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
1465 ret = -ENOMEM;
1466 goto error_clear_attrs;
1467 }
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])
1473 *attrcount_orig);
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;
1482 if (clk)
1483 iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
1484
1485 indio_dev->groups[indio_dev->groupcounter++] =
1486 &iio_dev_opaque->chan_attr_group;
1487
1488 return 0;
1489
1490 error_clear_attrs:
1491 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1492
1493 return ret;
1494 }
1495
1496 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1497 {
1498 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1499
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;
1503 }
1504
1505 static void iio_dev_release(struct device *device)
1506 {
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);
1509
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);
1514
1515 iio_buffer_put(indio_dev->buffer);
1516
1517 ida_simple_remove(&iio_ida, indio_dev->id);
1518 kfree(iio_dev_opaque);
1519 }
1520
1521 struct device_type iio_device_type = {
1522 .name = "iio_device",
1523 .release = iio_dev_release,
1524 };
1525
1526 /**
1527 * iio_device_alloc() - allocate an iio_dev from a driver
1528 * @parent: Parent device.
1529 * @sizeof_priv: Space to allocate for private structure.
1530 **/
1531 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
1532 {
1533 struct iio_dev_opaque *iio_dev_opaque;
1534 struct iio_dev *dev;
1535 size_t alloc_size;
1536
1537 alloc_size = sizeof(struct iio_dev_opaque);
1538 if (sizeof_priv) {
1539 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1540 alloc_size += sizeof_priv;
1541 }
1542
1543 iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1544 if (!iio_dev_opaque)
1545 return NULL;
1546
1547 dev = &iio_dev_opaque->indio_dev;
1548 dev->priv = (char *)iio_dev_opaque +
1549 ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
1550
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);
1560
1561 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1562 if (dev->id < 0) {
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);
1566 return NULL;
1567 }
1568 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1569 INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
1570
1571 return dev;
1572 }
1573 EXPORT_SYMBOL(iio_device_alloc);
1574
1575 /**
1576 * iio_device_free() - free an iio_dev from a driver
1577 * @dev: the iio_dev associated with the device
1578 **/
1579 void iio_device_free(struct iio_dev *dev)
1580 {
1581 if (dev)
1582 put_device(&dev->dev);
1583 }
1584 EXPORT_SYMBOL(iio_device_free);
1585
1586 static void devm_iio_device_release(struct device *dev, void *res)
1587 {
1588 iio_device_free(*(struct iio_dev **)res);
1589 }
1590
1591 /**
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.
1595 *
1596 * Managed iio_device_alloc. iio_dev allocated with this function is
1597 * automatically freed on driver detach.
1598 *
1599 * RETURNS:
1600 * Pointer to allocated iio_dev on success, NULL on failure.
1601 */
1602 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
1603 {
1604 struct iio_dev **ptr, *iio_dev;
1605
1606 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1607 GFP_KERNEL);
1608 if (!ptr)
1609 return NULL;
1610
1611 iio_dev = iio_device_alloc(parent, sizeof_priv);
1612 if (iio_dev) {
1613 *ptr = iio_dev;
1614 devres_add(parent, ptr);
1615 } else {
1616 devres_free(ptr);
1617 }
1618
1619 return iio_dev;
1620 }
1621 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1622
1623 /**
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
1627 * private data
1628 *
1629 * Return: 0 on success or -EBUSY if the device is already opened
1630 **/
1631 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1632 {
1633 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1634 struct iio_dev, chrdev);
1635
1636 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1637 return -EBUSY;
1638
1639 iio_device_get(indio_dev);
1640
1641 filp->private_data = indio_dev;
1642
1643 return 0;
1644 }
1645
1646 /**
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
1650 *
1651 * Return: 0 for successful release
1652 */
1653 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1654 {
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);
1659
1660 return 0;
1661 }
1662
1663 /* Somewhat of a cross file organization violation - ioctls here are actually
1664 * event related */
1665 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1666 {
1667 struct iio_dev *indio_dev = filp->private_data;
1668 int __user *ip = (int __user *)arg;
1669 int fd;
1670
1671 if (!indio_dev->info)
1672 return -ENODEV;
1673
1674 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1675 fd = iio_event_getfd(indio_dev);
1676 if (fd < 0)
1677 return fd;
1678 if (copy_to_user(ip, &fd, sizeof(fd)))
1679 return -EFAULT;
1680 return 0;
1681 }
1682 return -EINVAL;
1683 }
1684
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,
1694 };
1695
1696 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1697 {
1698 int i, j;
1699 const struct iio_chan_spec *channels = indio_dev->channels;
1700
1701 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1702 return 0;
1703
1704 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1705 if (channels[i].scan_index < 0)
1706 continue;
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);
1712 return -EINVAL;
1713 }
1714 }
1715
1716 return 0;
1717 }
1718
1719 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1720
1721 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1722 {
1723 int ret;
1724
1725 if (!indio_dev->info)
1726 return -EINVAL;
1727
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;
1732
1733 indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1734 NULL);
1735
1736 ret = iio_check_unique_scan_index(indio_dev);
1737 if (ret < 0)
1738 return ret;
1739
1740 /* configure elements for the chrdev */
1741 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1742
1743 iio_device_register_debugfs(indio_dev);
1744
1745 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1746 if (ret) {
1747 dev_err(indio_dev->dev.parent,
1748 "Failed to create buffer sysfs interfaces\n");
1749 goto error_unreg_debugfs;
1750 }
1751
1752 ret = iio_device_register_sysfs(indio_dev);
1753 if (ret) {
1754 dev_err(indio_dev->dev.parent,
1755 "Failed to register sysfs interfaces\n");
1756 goto error_buffer_free_sysfs;
1757 }
1758 ret = iio_device_register_eventset(indio_dev);
1759 if (ret) {
1760 dev_err(indio_dev->dev.parent,
1761 "Failed to register event set\n");
1762 goto error_free_sysfs;
1763 }
1764 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1765 iio_device_register_trigger_consumer(indio_dev);
1766
1767 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1768 indio_dev->setup_ops == NULL)
1769 indio_dev->setup_ops = &noop_ring_setup_ops;
1770
1771 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1772
1773 indio_dev->chrdev.owner = this_mod;
1774
1775 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1776 if (ret < 0)
1777 goto error_unreg_eventset;
1778
1779 return 0;
1780
1781 error_unreg_eventset:
1782 iio_device_unregister_eventset(indio_dev);
1783 error_free_sysfs:
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);
1789 return ret;
1790 }
1791 EXPORT_SYMBOL(__iio_device_register);
1792
1793 /**
1794 * iio_device_unregister() - unregister a device from the IIO subsystem
1795 * @indio_dev: Device structure representing the device.
1796 **/
1797 void iio_device_unregister(struct iio_dev *indio_dev)
1798 {
1799 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1800
1801 mutex_lock(&indio_dev->info_exist_lock);
1802
1803 iio_device_unregister_debugfs(indio_dev);
1804
1805 iio_disable_all_buffers(indio_dev);
1806
1807 indio_dev->info = NULL;
1808
1809 iio_device_wakeup_eventset(indio_dev);
1810 iio_buffer_wakeup_poll(indio_dev);
1811
1812 mutex_unlock(&indio_dev->info_exist_lock);
1813
1814 iio_buffer_free_sysfs_and_mask(indio_dev);
1815 }
1816 EXPORT_SYMBOL(iio_device_unregister);
1817
1818 static void devm_iio_device_unreg(struct device *dev, void *res)
1819 {
1820 iio_device_unregister(*(struct iio_dev **)res);
1821 }
1822
1823 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1824 struct module *this_mod)
1825 {
1826 struct iio_dev **ptr;
1827 int ret;
1828
1829 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1830 if (!ptr)
1831 return -ENOMEM;
1832
1833 *ptr = indio_dev;
1834 ret = __iio_device_register(indio_dev, this_mod);
1835 if (!ret)
1836 devres_add(dev, ptr);
1837 else
1838 devres_free(ptr);
1839
1840 return ret;
1841 }
1842 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1843
1844 /**
1845 * iio_device_claim_direct_mode - Keep device in direct mode
1846 * @indio_dev: the iio_dev associated with the device
1847 *
1848 * If the device is in direct mode it is guaranteed to stay
1849 * that way until iio_device_release_direct_mode() is called.
1850 *
1851 * Use with iio_device_release_direct_mode()
1852 *
1853 * Returns: 0 on success, -EBUSY on failure
1854 */
1855 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1856 {
1857 mutex_lock(&indio_dev->mlock);
1858
1859 if (iio_buffer_enabled(indio_dev)) {
1860 mutex_unlock(&indio_dev->mlock);
1861 return -EBUSY;
1862 }
1863 return 0;
1864 }
1865 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1866
1867 /**
1868 * iio_device_release_direct_mode - releases claim on direct mode
1869 * @indio_dev: the iio_dev associated with the device
1870 *
1871 * Release the claim. Device is no longer guaranteed to stay
1872 * in direct mode.
1873 *
1874 * Use with iio_device_claim_direct_mode()
1875 */
1876 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1877 {
1878 mutex_unlock(&indio_dev->mlock);
1879 }
1880 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1881
1882 subsys_initcall(iio_init);
1883 module_exit(iio_exit);
1884
1885 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1886 MODULE_DESCRIPTION("Industrial I/O core");
1887 MODULE_LICENSE("GPL");
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