]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/iio/industrialio-core.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[mirror_ubuntu-bionic-kernel.git] / drivers / iio / industrialio-core.c
1 /* The industrial I/O core
2 *
3 * Copyright (c) 2008 Jonathan Cameron
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * Based on elements of hwmon and input subsystems.
10 */
11
12 #define pr_fmt(fmt) "iio-core: " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/idr.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/fs.h>
21 #include <linux/poll.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/cdev.h>
25 #include <linux/slab.h>
26 #include <linux/anon_inodes.h>
27 #include <linux/debugfs.h>
28 #include <linux/mutex.h>
29 #include <linux/iio/iio.h>
30 #include "iio_core.h"
31 #include "iio_core_trigger.h"
32 #include <linux/iio/sysfs.h>
33 #include <linux/iio/events.h>
34 #include <linux/iio/buffer.h>
35 #include <linux/iio/buffer_impl.h>
36
37 /* IDA to assign each registered device a unique id */
38 static DEFINE_IDA(iio_ida);
39
40 static dev_t iio_devt;
41
42 #define IIO_DEV_MAX 256
43 struct bus_type iio_bus_type = {
44 .name = "iio",
45 };
46 EXPORT_SYMBOL(iio_bus_type);
47
48 static struct dentry *iio_debugfs_dentry;
49
50 static const char * const iio_direction[] = {
51 [0] = "in",
52 [1] = "out",
53 };
54
55 static const char * const iio_chan_type_name_spec[] = {
56 [IIO_VOLTAGE] = "voltage",
57 [IIO_CURRENT] = "current",
58 [IIO_POWER] = "power",
59 [IIO_ACCEL] = "accel",
60 [IIO_ANGL_VEL] = "anglvel",
61 [IIO_MAGN] = "magn",
62 [IIO_LIGHT] = "illuminance",
63 [IIO_INTENSITY] = "intensity",
64 [IIO_PROXIMITY] = "proximity",
65 [IIO_TEMP] = "temp",
66 [IIO_INCLI] = "incli",
67 [IIO_ROT] = "rot",
68 [IIO_ANGL] = "angl",
69 [IIO_TIMESTAMP] = "timestamp",
70 [IIO_CAPACITANCE] = "capacitance",
71 [IIO_ALTVOLTAGE] = "altvoltage",
72 [IIO_CCT] = "cct",
73 [IIO_PRESSURE] = "pressure",
74 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
75 [IIO_ACTIVITY] = "activity",
76 [IIO_STEPS] = "steps",
77 [IIO_ENERGY] = "energy",
78 [IIO_DISTANCE] = "distance",
79 [IIO_VELOCITY] = "velocity",
80 [IIO_CONCENTRATION] = "concentration",
81 [IIO_RESISTANCE] = "resistance",
82 [IIO_PH] = "ph",
83 [IIO_UVINDEX] = "uvindex",
84 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
85 [IIO_COUNT] = "count",
86 [IIO_INDEX] = "index",
87 [IIO_GRAVITY] = "gravity",
88 };
89
90 static const char * const iio_modifier_names[] = {
91 [IIO_MOD_X] = "x",
92 [IIO_MOD_Y] = "y",
93 [IIO_MOD_Z] = "z",
94 [IIO_MOD_X_AND_Y] = "x&y",
95 [IIO_MOD_X_AND_Z] = "x&z",
96 [IIO_MOD_Y_AND_Z] = "y&z",
97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
98 [IIO_MOD_X_OR_Y] = "x|y",
99 [IIO_MOD_X_OR_Z] = "x|z",
100 [IIO_MOD_Y_OR_Z] = "y|z",
101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
102 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
103 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
104 [IIO_MOD_LIGHT_BOTH] = "both",
105 [IIO_MOD_LIGHT_IR] = "ir",
106 [IIO_MOD_LIGHT_CLEAR] = "clear",
107 [IIO_MOD_LIGHT_RED] = "red",
108 [IIO_MOD_LIGHT_GREEN] = "green",
109 [IIO_MOD_LIGHT_BLUE] = "blue",
110 [IIO_MOD_LIGHT_UV] = "uv",
111 [IIO_MOD_QUATERNION] = "quaternion",
112 [IIO_MOD_TEMP_AMBIENT] = "ambient",
113 [IIO_MOD_TEMP_OBJECT] = "object",
114 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
115 [IIO_MOD_NORTH_TRUE] = "from_north_true",
116 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
117 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
118 [IIO_MOD_RUNNING] = "running",
119 [IIO_MOD_JOGGING] = "jogging",
120 [IIO_MOD_WALKING] = "walking",
121 [IIO_MOD_STILL] = "still",
122 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
123 [IIO_MOD_I] = "i",
124 [IIO_MOD_Q] = "q",
125 [IIO_MOD_CO2] = "co2",
126 [IIO_MOD_VOC] = "voc",
127 };
128
129 /* relies on pairs of these shared then separate */
130 static const char * const iio_chan_info_postfix[] = {
131 [IIO_CHAN_INFO_RAW] = "raw",
132 [IIO_CHAN_INFO_PROCESSED] = "input",
133 [IIO_CHAN_INFO_SCALE] = "scale",
134 [IIO_CHAN_INFO_OFFSET] = "offset",
135 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
136 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
137 [IIO_CHAN_INFO_PEAK] = "peak_raw",
138 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
139 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
140 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
141 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
142 = "filter_low_pass_3db_frequency",
143 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
144 = "filter_high_pass_3db_frequency",
145 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
146 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
147 [IIO_CHAN_INFO_PHASE] = "phase",
148 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
149 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
150 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
151 [IIO_CHAN_INFO_ENABLE] = "en",
152 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
153 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
154 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
155 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
156 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
157 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
158 };
159
160 /**
161 * iio_find_channel_from_si() - get channel from its scan index
162 * @indio_dev: device
163 * @si: scan index to match
164 */
165 const struct iio_chan_spec
166 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
167 {
168 int i;
169
170 for (i = 0; i < indio_dev->num_channels; i++)
171 if (indio_dev->channels[i].scan_index == si)
172 return &indio_dev->channels[i];
173 return NULL;
174 }
175
176 /* This turns up an awful lot */
177 ssize_t iio_read_const_attr(struct device *dev,
178 struct device_attribute *attr,
179 char *buf)
180 {
181 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
182 }
183 EXPORT_SYMBOL(iio_read_const_attr);
184
185 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
186 {
187 int ret;
188 const struct iio_event_interface *ev_int = indio_dev->event_interface;
189
190 ret = mutex_lock_interruptible(&indio_dev->mlock);
191 if (ret)
192 return ret;
193 if ((ev_int && iio_event_enabled(ev_int)) ||
194 iio_buffer_enabled(indio_dev)) {
195 mutex_unlock(&indio_dev->mlock);
196 return -EBUSY;
197 }
198 indio_dev->clock_id = clock_id;
199 mutex_unlock(&indio_dev->mlock);
200
201 return 0;
202 }
203
204 /**
205 * iio_get_time_ns() - utility function to get a time stamp for events etc
206 * @indio_dev: device
207 */
208 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
209 {
210 struct timespec tp;
211
212 switch (iio_device_get_clock(indio_dev)) {
213 case CLOCK_REALTIME:
214 ktime_get_real_ts(&tp);
215 break;
216 case CLOCK_MONOTONIC:
217 ktime_get_ts(&tp);
218 break;
219 case CLOCK_MONOTONIC_RAW:
220 getrawmonotonic(&tp);
221 break;
222 case CLOCK_REALTIME_COARSE:
223 tp = current_kernel_time();
224 break;
225 case CLOCK_MONOTONIC_COARSE:
226 tp = get_monotonic_coarse();
227 break;
228 case CLOCK_BOOTTIME:
229 get_monotonic_boottime(&tp);
230 break;
231 case CLOCK_TAI:
232 timekeeping_clocktai(&tp);
233 break;
234 default:
235 BUG();
236 }
237
238 return timespec_to_ns(&tp);
239 }
240 EXPORT_SYMBOL(iio_get_time_ns);
241
242 /**
243 * iio_get_time_res() - utility function to get time stamp clock resolution in
244 * nano seconds.
245 * @indio_dev: device
246 */
247 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
248 {
249 switch (iio_device_get_clock(indio_dev)) {
250 case CLOCK_REALTIME:
251 case CLOCK_MONOTONIC:
252 case CLOCK_MONOTONIC_RAW:
253 case CLOCK_BOOTTIME:
254 case CLOCK_TAI:
255 return hrtimer_resolution;
256 case CLOCK_REALTIME_COARSE:
257 case CLOCK_MONOTONIC_COARSE:
258 return LOW_RES_NSEC;
259 default:
260 BUG();
261 }
262 }
263 EXPORT_SYMBOL(iio_get_time_res);
264
265 static int __init iio_init(void)
266 {
267 int ret;
268
269 /* Register sysfs bus */
270 ret = bus_register(&iio_bus_type);
271 if (ret < 0) {
272 pr_err("could not register bus type\n");
273 goto error_nothing;
274 }
275
276 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
277 if (ret < 0) {
278 pr_err("failed to allocate char dev region\n");
279 goto error_unregister_bus_type;
280 }
281
282 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
283
284 return 0;
285
286 error_unregister_bus_type:
287 bus_unregister(&iio_bus_type);
288 error_nothing:
289 return ret;
290 }
291
292 static void __exit iio_exit(void)
293 {
294 if (iio_devt)
295 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
296 bus_unregister(&iio_bus_type);
297 debugfs_remove(iio_debugfs_dentry);
298 }
299
300 #if defined(CONFIG_DEBUG_FS)
301 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
302 size_t count, loff_t *ppos)
303 {
304 struct iio_dev *indio_dev = file->private_data;
305 char buf[20];
306 unsigned val = 0;
307 ssize_t len;
308 int ret;
309
310 ret = indio_dev->info->debugfs_reg_access(indio_dev,
311 indio_dev->cached_reg_addr,
312 0, &val);
313 if (ret) {
314 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
315 return ret;
316 }
317
318 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
319
320 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
321 }
322
323 static ssize_t iio_debugfs_write_reg(struct file *file,
324 const char __user *userbuf, size_t count, loff_t *ppos)
325 {
326 struct iio_dev *indio_dev = file->private_data;
327 unsigned reg, val;
328 char buf[80];
329 int ret;
330
331 count = min_t(size_t, count, (sizeof(buf)-1));
332 if (copy_from_user(buf, userbuf, count))
333 return -EFAULT;
334
335 buf[count] = 0;
336
337 ret = sscanf(buf, "%i %i", &reg, &val);
338
339 switch (ret) {
340 case 1:
341 indio_dev->cached_reg_addr = reg;
342 break;
343 case 2:
344 indio_dev->cached_reg_addr = reg;
345 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
346 val, NULL);
347 if (ret) {
348 dev_err(indio_dev->dev.parent, "%s: write failed\n",
349 __func__);
350 return ret;
351 }
352 break;
353 default:
354 return -EINVAL;
355 }
356
357 return count;
358 }
359
360 static const struct file_operations iio_debugfs_reg_fops = {
361 .open = simple_open,
362 .read = iio_debugfs_read_reg,
363 .write = iio_debugfs_write_reg,
364 };
365
366 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
367 {
368 debugfs_remove_recursive(indio_dev->debugfs_dentry);
369 }
370
371 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
372 {
373 struct dentry *d;
374
375 if (indio_dev->info->debugfs_reg_access == NULL)
376 return 0;
377
378 if (!iio_debugfs_dentry)
379 return 0;
380
381 indio_dev->debugfs_dentry =
382 debugfs_create_dir(dev_name(&indio_dev->dev),
383 iio_debugfs_dentry);
384 if (indio_dev->debugfs_dentry == NULL) {
385 dev_warn(indio_dev->dev.parent,
386 "Failed to create debugfs directory\n");
387 return -EFAULT;
388 }
389
390 d = debugfs_create_file("direct_reg_access", 0644,
391 indio_dev->debugfs_dentry,
392 indio_dev, &iio_debugfs_reg_fops);
393 if (!d) {
394 iio_device_unregister_debugfs(indio_dev);
395 return -ENOMEM;
396 }
397
398 return 0;
399 }
400 #else
401 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
402 {
403 return 0;
404 }
405
406 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
407 {
408 }
409 #endif /* CONFIG_DEBUG_FS */
410
411 static ssize_t iio_read_channel_ext_info(struct device *dev,
412 struct device_attribute *attr,
413 char *buf)
414 {
415 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
416 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
417 const struct iio_chan_spec_ext_info *ext_info;
418
419 ext_info = &this_attr->c->ext_info[this_attr->address];
420
421 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
422 }
423
424 static ssize_t iio_write_channel_ext_info(struct device *dev,
425 struct device_attribute *attr,
426 const char *buf,
427 size_t len)
428 {
429 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
430 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
431 const struct iio_chan_spec_ext_info *ext_info;
432
433 ext_info = &this_attr->c->ext_info[this_attr->address];
434
435 return ext_info->write(indio_dev, ext_info->private,
436 this_attr->c, buf, len);
437 }
438
439 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
440 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
441 {
442 const struct iio_enum *e = (const struct iio_enum *)priv;
443 unsigned int i;
444 size_t len = 0;
445
446 if (!e->num_items)
447 return 0;
448
449 for (i = 0; i < e->num_items; ++i)
450 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
451
452 /* replace last space with a newline */
453 buf[len - 1] = '\n';
454
455 return len;
456 }
457 EXPORT_SYMBOL_GPL(iio_enum_available_read);
458
459 ssize_t iio_enum_read(struct iio_dev *indio_dev,
460 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
461 {
462 const struct iio_enum *e = (const struct iio_enum *)priv;
463 int i;
464
465 if (!e->get)
466 return -EINVAL;
467
468 i = e->get(indio_dev, chan);
469 if (i < 0)
470 return i;
471 else if (i >= e->num_items)
472 return -EINVAL;
473
474 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
475 }
476 EXPORT_SYMBOL_GPL(iio_enum_read);
477
478 ssize_t iio_enum_write(struct iio_dev *indio_dev,
479 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
480 size_t len)
481 {
482 const struct iio_enum *e = (const struct iio_enum *)priv;
483 int ret;
484
485 if (!e->set)
486 return -EINVAL;
487
488 ret = __sysfs_match_string(e->items, e->num_items, buf);
489 if (ret < 0)
490 return ret;
491
492 ret = e->set(indio_dev, chan, ret);
493 return ret ? ret : len;
494 }
495 EXPORT_SYMBOL_GPL(iio_enum_write);
496
497 static const struct iio_mount_matrix iio_mount_idmatrix = {
498 .rotation = {
499 "1", "0", "0",
500 "0", "1", "0",
501 "0", "0", "1"
502 }
503 };
504
505 static int iio_setup_mount_idmatrix(const struct device *dev,
506 struct iio_mount_matrix *matrix)
507 {
508 *matrix = iio_mount_idmatrix;
509 dev_info(dev, "mounting matrix not found: using identity...\n");
510 return 0;
511 }
512
513 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
514 const struct iio_chan_spec *chan, char *buf)
515 {
516 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
517 priv)(indio_dev, chan);
518
519 if (IS_ERR(mtx))
520 return PTR_ERR(mtx);
521
522 if (!mtx)
523 mtx = &iio_mount_idmatrix;
524
525 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
526 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
527 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
528 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
529 }
530 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
531
532 /**
533 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
534 * device-tree "mount-matrix" property
535 * @dev: device the mounting matrix property is assigned to
536 * @propname: device specific mounting matrix property name
537 * @matrix: where to store retrieved matrix
538 *
539 * If device is assigned no mounting matrix property, a default 3x3 identity
540 * matrix will be filled in.
541 *
542 * Return: 0 if success, or a negative error code on failure.
543 */
544 #ifdef CONFIG_OF
545 int of_iio_read_mount_matrix(const struct device *dev,
546 const char *propname,
547 struct iio_mount_matrix *matrix)
548 {
549 if (dev->of_node) {
550 int err = of_property_read_string_array(dev->of_node,
551 propname, matrix->rotation,
552 ARRAY_SIZE(iio_mount_idmatrix.rotation));
553
554 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
555 return 0;
556
557 if (err >= 0)
558 /* Invalid number of matrix entries. */
559 return -EINVAL;
560
561 if (err != -EINVAL)
562 /* Invalid matrix declaration format. */
563 return err;
564 }
565
566 /* Matrix was not declared at all: fallback to identity. */
567 return iio_setup_mount_idmatrix(dev, matrix);
568 }
569 #else
570 int of_iio_read_mount_matrix(const struct device *dev,
571 const char *propname,
572 struct iio_mount_matrix *matrix)
573 {
574 return iio_setup_mount_idmatrix(dev, matrix);
575 }
576 #endif
577 EXPORT_SYMBOL(of_iio_read_mount_matrix);
578
579 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
580 int size, const int *vals)
581 {
582 unsigned long long tmp;
583 int tmp0, tmp1;
584 bool scale_db = false;
585
586 switch (type) {
587 case IIO_VAL_INT:
588 return snprintf(buf, len, "%d", vals[0]);
589 case IIO_VAL_INT_PLUS_MICRO_DB:
590 scale_db = true;
591 case IIO_VAL_INT_PLUS_MICRO:
592 if (vals[1] < 0)
593 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
594 -vals[1], scale_db ? " dB" : "");
595 else
596 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
597 scale_db ? " dB" : "");
598 case IIO_VAL_INT_PLUS_NANO:
599 if (vals[1] < 0)
600 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
601 -vals[1]);
602 else
603 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
604 case IIO_VAL_FRACTIONAL:
605 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
606 tmp1 = vals[1];
607 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
608 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
609 case IIO_VAL_FRACTIONAL_LOG2:
610 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
611 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
612 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
613 case IIO_VAL_INT_MULTIPLE:
614 {
615 int i;
616 int l = 0;
617
618 for (i = 0; i < size; ++i) {
619 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
620 if (l >= len)
621 break;
622 }
623 return l;
624 }
625 default:
626 return 0;
627 }
628 }
629
630 /**
631 * iio_format_value() - Formats a IIO value into its string representation
632 * @buf: The buffer to which the formatted value gets written
633 * which is assumed to be big enough (i.e. PAGE_SIZE).
634 * @type: One of the IIO_VAL_* constants. This decides how the val
635 * and val2 parameters are formatted.
636 * @size: Number of IIO value entries contained in vals
637 * @vals: Pointer to the values, exact meaning depends on the
638 * type parameter.
639 *
640 * Return: 0 by default, a negative number on failure or the
641 * total number of characters written for a type that belongs
642 * to the IIO_VAL_* constant.
643 */
644 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
645 {
646 ssize_t len;
647
648 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
649 if (len >= PAGE_SIZE - 1)
650 return -EFBIG;
651
652 return len + sprintf(buf + len, "\n");
653 }
654 EXPORT_SYMBOL_GPL(iio_format_value);
655
656 static ssize_t iio_read_channel_info(struct device *dev,
657 struct device_attribute *attr,
658 char *buf)
659 {
660 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
661 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
662 int vals[INDIO_MAX_RAW_ELEMENTS];
663 int ret;
664 int val_len = 2;
665
666 if (indio_dev->info->read_raw_multi)
667 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
668 INDIO_MAX_RAW_ELEMENTS,
669 vals, &val_len,
670 this_attr->address);
671 else
672 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
673 &vals[0], &vals[1], this_attr->address);
674
675 if (ret < 0)
676 return ret;
677
678 return iio_format_value(buf, ret, val_len, vals);
679 }
680
681 static ssize_t iio_format_avail_list(char *buf, const int *vals,
682 int type, int length)
683 {
684 int i;
685 ssize_t len = 0;
686
687 switch (type) {
688 case IIO_VAL_INT:
689 for (i = 0; i < length; i++) {
690 len += __iio_format_value(buf + len, PAGE_SIZE - len,
691 type, 1, &vals[i]);
692 if (len >= PAGE_SIZE)
693 return -EFBIG;
694 if (i < length - 1)
695 len += snprintf(buf + len, PAGE_SIZE - len,
696 " ");
697 else
698 len += snprintf(buf + len, PAGE_SIZE - len,
699 "\n");
700 if (len >= PAGE_SIZE)
701 return -EFBIG;
702 }
703 break;
704 default:
705 for (i = 0; i < length / 2; i++) {
706 len += __iio_format_value(buf + len, PAGE_SIZE - len,
707 type, 2, &vals[i * 2]);
708 if (len >= PAGE_SIZE)
709 return -EFBIG;
710 if (i < length / 2 - 1)
711 len += snprintf(buf + len, PAGE_SIZE - len,
712 " ");
713 else
714 len += snprintf(buf + len, PAGE_SIZE - len,
715 "\n");
716 if (len >= PAGE_SIZE)
717 return -EFBIG;
718 }
719 }
720
721 return len;
722 }
723
724 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
725 {
726 int i;
727 ssize_t len;
728
729 len = snprintf(buf, PAGE_SIZE, "[");
730 switch (type) {
731 case IIO_VAL_INT:
732 for (i = 0; i < 3; i++) {
733 len += __iio_format_value(buf + len, PAGE_SIZE - len,
734 type, 1, &vals[i]);
735 if (len >= PAGE_SIZE)
736 return -EFBIG;
737 if (i < 2)
738 len += snprintf(buf + len, PAGE_SIZE - len,
739 " ");
740 else
741 len += snprintf(buf + len, PAGE_SIZE - len,
742 "]\n");
743 if (len >= PAGE_SIZE)
744 return -EFBIG;
745 }
746 break;
747 default:
748 for (i = 0; i < 3; i++) {
749 len += __iio_format_value(buf + len, PAGE_SIZE - len,
750 type, 2, &vals[i * 2]);
751 if (len >= PAGE_SIZE)
752 return -EFBIG;
753 if (i < 2)
754 len += snprintf(buf + len, PAGE_SIZE - len,
755 " ");
756 else
757 len += snprintf(buf + len, PAGE_SIZE - len,
758 "]\n");
759 if (len >= PAGE_SIZE)
760 return -EFBIG;
761 }
762 }
763
764 return len;
765 }
766
767 static ssize_t iio_read_channel_info_avail(struct device *dev,
768 struct device_attribute *attr,
769 char *buf)
770 {
771 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
772 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
773 const int *vals;
774 int ret;
775 int length;
776 int type;
777
778 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
779 &vals, &type, &length,
780 this_attr->address);
781
782 if (ret < 0)
783 return ret;
784 switch (ret) {
785 case IIO_AVAIL_LIST:
786 return iio_format_avail_list(buf, vals, type, length);
787 case IIO_AVAIL_RANGE:
788 return iio_format_avail_range(buf, vals, type);
789 default:
790 return -EINVAL;
791 }
792 }
793
794 /**
795 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
796 * @str: The string to parse
797 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
798 * @integer: The integer part of the number
799 * @fract: The fractional part of the number
800 *
801 * Returns 0 on success, or a negative error code if the string could not be
802 * parsed.
803 */
804 int iio_str_to_fixpoint(const char *str, int fract_mult,
805 int *integer, int *fract)
806 {
807 int i = 0, f = 0;
808 bool integer_part = true, negative = false;
809
810 if (fract_mult == 0) {
811 *fract = 0;
812
813 return kstrtoint(str, 0, integer);
814 }
815
816 if (str[0] == '-') {
817 negative = true;
818 str++;
819 } else if (str[0] == '+') {
820 str++;
821 }
822
823 while (*str) {
824 if ('0' <= *str && *str <= '9') {
825 if (integer_part) {
826 i = i * 10 + *str - '0';
827 } else {
828 f += fract_mult * (*str - '0');
829 fract_mult /= 10;
830 }
831 } else if (*str == '\n') {
832 if (*(str + 1) == '\0')
833 break;
834 else
835 return -EINVAL;
836 } else if (*str == '.' && integer_part) {
837 integer_part = false;
838 } else {
839 return -EINVAL;
840 }
841 str++;
842 }
843
844 if (negative) {
845 if (i)
846 i = -i;
847 else
848 f = -f;
849 }
850
851 *integer = i;
852 *fract = f;
853
854 return 0;
855 }
856 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
857
858 static ssize_t iio_write_channel_info(struct device *dev,
859 struct device_attribute *attr,
860 const char *buf,
861 size_t len)
862 {
863 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
864 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
865 int ret, fract_mult = 100000;
866 int integer, fract;
867
868 /* Assumes decimal - precision based on number of digits */
869 if (!indio_dev->info->write_raw)
870 return -EINVAL;
871
872 if (indio_dev->info->write_raw_get_fmt)
873 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
874 this_attr->c, this_attr->address)) {
875 case IIO_VAL_INT:
876 fract_mult = 0;
877 break;
878 case IIO_VAL_INT_PLUS_MICRO:
879 fract_mult = 100000;
880 break;
881 case IIO_VAL_INT_PLUS_NANO:
882 fract_mult = 100000000;
883 break;
884 default:
885 return -EINVAL;
886 }
887
888 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
889 if (ret)
890 return ret;
891
892 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
893 integer, fract, this_attr->address);
894 if (ret)
895 return ret;
896
897 return len;
898 }
899
900 static
901 int __iio_device_attr_init(struct device_attribute *dev_attr,
902 const char *postfix,
903 struct iio_chan_spec const *chan,
904 ssize_t (*readfunc)(struct device *dev,
905 struct device_attribute *attr,
906 char *buf),
907 ssize_t (*writefunc)(struct device *dev,
908 struct device_attribute *attr,
909 const char *buf,
910 size_t len),
911 enum iio_shared_by shared_by)
912 {
913 int ret = 0;
914 char *name = NULL;
915 char *full_postfix;
916 sysfs_attr_init(&dev_attr->attr);
917
918 /* Build up postfix of <extend_name>_<modifier>_postfix */
919 if (chan->modified && (shared_by == IIO_SEPARATE)) {
920 if (chan->extend_name)
921 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
922 iio_modifier_names[chan
923 ->channel2],
924 chan->extend_name,
925 postfix);
926 else
927 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
928 iio_modifier_names[chan
929 ->channel2],
930 postfix);
931 } else {
932 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
933 full_postfix = kstrdup(postfix, GFP_KERNEL);
934 else
935 full_postfix = kasprintf(GFP_KERNEL,
936 "%s_%s",
937 chan->extend_name,
938 postfix);
939 }
940 if (full_postfix == NULL)
941 return -ENOMEM;
942
943 if (chan->differential) { /* Differential can not have modifier */
944 switch (shared_by) {
945 case IIO_SHARED_BY_ALL:
946 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
947 break;
948 case IIO_SHARED_BY_DIR:
949 name = kasprintf(GFP_KERNEL, "%s_%s",
950 iio_direction[chan->output],
951 full_postfix);
952 break;
953 case IIO_SHARED_BY_TYPE:
954 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
955 iio_direction[chan->output],
956 iio_chan_type_name_spec[chan->type],
957 iio_chan_type_name_spec[chan->type],
958 full_postfix);
959 break;
960 case IIO_SEPARATE:
961 if (!chan->indexed) {
962 WARN(1, "Differential channels must be indexed\n");
963 ret = -EINVAL;
964 goto error_free_full_postfix;
965 }
966 name = kasprintf(GFP_KERNEL,
967 "%s_%s%d-%s%d_%s",
968 iio_direction[chan->output],
969 iio_chan_type_name_spec[chan->type],
970 chan->channel,
971 iio_chan_type_name_spec[chan->type],
972 chan->channel2,
973 full_postfix);
974 break;
975 }
976 } else { /* Single ended */
977 switch (shared_by) {
978 case IIO_SHARED_BY_ALL:
979 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
980 break;
981 case IIO_SHARED_BY_DIR:
982 name = kasprintf(GFP_KERNEL, "%s_%s",
983 iio_direction[chan->output],
984 full_postfix);
985 break;
986 case IIO_SHARED_BY_TYPE:
987 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
988 iio_direction[chan->output],
989 iio_chan_type_name_spec[chan->type],
990 full_postfix);
991 break;
992
993 case IIO_SEPARATE:
994 if (chan->indexed)
995 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
996 iio_direction[chan->output],
997 iio_chan_type_name_spec[chan->type],
998 chan->channel,
999 full_postfix);
1000 else
1001 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1002 iio_direction[chan->output],
1003 iio_chan_type_name_spec[chan->type],
1004 full_postfix);
1005 break;
1006 }
1007 }
1008 if (name == NULL) {
1009 ret = -ENOMEM;
1010 goto error_free_full_postfix;
1011 }
1012 dev_attr->attr.name = name;
1013
1014 if (readfunc) {
1015 dev_attr->attr.mode |= S_IRUGO;
1016 dev_attr->show = readfunc;
1017 }
1018
1019 if (writefunc) {
1020 dev_attr->attr.mode |= S_IWUSR;
1021 dev_attr->store = writefunc;
1022 }
1023
1024 error_free_full_postfix:
1025 kfree(full_postfix);
1026
1027 return ret;
1028 }
1029
1030 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1031 {
1032 kfree(dev_attr->attr.name);
1033 }
1034
1035 int __iio_add_chan_devattr(const char *postfix,
1036 struct iio_chan_spec const *chan,
1037 ssize_t (*readfunc)(struct device *dev,
1038 struct device_attribute *attr,
1039 char *buf),
1040 ssize_t (*writefunc)(struct device *dev,
1041 struct device_attribute *attr,
1042 const char *buf,
1043 size_t len),
1044 u64 mask,
1045 enum iio_shared_by shared_by,
1046 struct device *dev,
1047 struct list_head *attr_list)
1048 {
1049 int ret;
1050 struct iio_dev_attr *iio_attr, *t;
1051
1052 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1053 if (iio_attr == NULL)
1054 return -ENOMEM;
1055 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1056 postfix, chan,
1057 readfunc, writefunc, shared_by);
1058 if (ret)
1059 goto error_iio_dev_attr_free;
1060 iio_attr->c = chan;
1061 iio_attr->address = mask;
1062 list_for_each_entry(t, attr_list, l)
1063 if (strcmp(t->dev_attr.attr.name,
1064 iio_attr->dev_attr.attr.name) == 0) {
1065 if (shared_by == IIO_SEPARATE)
1066 dev_err(dev, "tried to double register : %s\n",
1067 t->dev_attr.attr.name);
1068 ret = -EBUSY;
1069 goto error_device_attr_deinit;
1070 }
1071 list_add(&iio_attr->l, attr_list);
1072
1073 return 0;
1074
1075 error_device_attr_deinit:
1076 __iio_device_attr_deinit(&iio_attr->dev_attr);
1077 error_iio_dev_attr_free:
1078 kfree(iio_attr);
1079 return ret;
1080 }
1081
1082 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1083 struct iio_chan_spec const *chan,
1084 enum iio_shared_by shared_by,
1085 const long *infomask)
1086 {
1087 int i, ret, attrcount = 0;
1088
1089 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1090 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1091 return -EINVAL;
1092 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1093 chan,
1094 &iio_read_channel_info,
1095 &iio_write_channel_info,
1096 i,
1097 shared_by,
1098 &indio_dev->dev,
1099 &indio_dev->channel_attr_list);
1100 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1101 continue;
1102 else if (ret < 0)
1103 return ret;
1104 attrcount++;
1105 }
1106
1107 return attrcount;
1108 }
1109
1110 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1111 struct iio_chan_spec const *chan,
1112 enum iio_shared_by shared_by,
1113 const long *infomask)
1114 {
1115 int i, ret, attrcount = 0;
1116 char *avail_postfix;
1117
1118 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1119 avail_postfix = kasprintf(GFP_KERNEL,
1120 "%s_available",
1121 iio_chan_info_postfix[i]);
1122 if (!avail_postfix)
1123 return -ENOMEM;
1124
1125 ret = __iio_add_chan_devattr(avail_postfix,
1126 chan,
1127 &iio_read_channel_info_avail,
1128 NULL,
1129 i,
1130 shared_by,
1131 &indio_dev->dev,
1132 &indio_dev->channel_attr_list);
1133 kfree(avail_postfix);
1134 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1135 continue;
1136 else if (ret < 0)
1137 return ret;
1138 attrcount++;
1139 }
1140
1141 return attrcount;
1142 }
1143
1144 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1145 struct iio_chan_spec const *chan)
1146 {
1147 int ret, attrcount = 0;
1148 const struct iio_chan_spec_ext_info *ext_info;
1149
1150 if (chan->channel < 0)
1151 return 0;
1152 ret = iio_device_add_info_mask_type(indio_dev, chan,
1153 IIO_SEPARATE,
1154 &chan->info_mask_separate);
1155 if (ret < 0)
1156 return ret;
1157 attrcount += ret;
1158
1159 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1160 IIO_SEPARATE,
1161 &chan->
1162 info_mask_separate_available);
1163 if (ret < 0)
1164 return ret;
1165 attrcount += ret;
1166
1167 ret = iio_device_add_info_mask_type(indio_dev, chan,
1168 IIO_SHARED_BY_TYPE,
1169 &chan->info_mask_shared_by_type);
1170 if (ret < 0)
1171 return ret;
1172 attrcount += ret;
1173
1174 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1175 IIO_SHARED_BY_TYPE,
1176 &chan->
1177 info_mask_shared_by_type_available);
1178 if (ret < 0)
1179 return ret;
1180 attrcount += ret;
1181
1182 ret = iio_device_add_info_mask_type(indio_dev, chan,
1183 IIO_SHARED_BY_DIR,
1184 &chan->info_mask_shared_by_dir);
1185 if (ret < 0)
1186 return ret;
1187 attrcount += ret;
1188
1189 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1190 IIO_SHARED_BY_DIR,
1191 &chan->info_mask_shared_by_dir_available);
1192 if (ret < 0)
1193 return ret;
1194 attrcount += ret;
1195
1196 ret = iio_device_add_info_mask_type(indio_dev, chan,
1197 IIO_SHARED_BY_ALL,
1198 &chan->info_mask_shared_by_all);
1199 if (ret < 0)
1200 return ret;
1201 attrcount += ret;
1202
1203 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1204 IIO_SHARED_BY_ALL,
1205 &chan->info_mask_shared_by_all_available);
1206 if (ret < 0)
1207 return ret;
1208 attrcount += ret;
1209
1210 if (chan->ext_info) {
1211 unsigned int i = 0;
1212 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1213 ret = __iio_add_chan_devattr(ext_info->name,
1214 chan,
1215 ext_info->read ?
1216 &iio_read_channel_ext_info : NULL,
1217 ext_info->write ?
1218 &iio_write_channel_ext_info : NULL,
1219 i,
1220 ext_info->shared,
1221 &indio_dev->dev,
1222 &indio_dev->channel_attr_list);
1223 i++;
1224 if (ret == -EBUSY && ext_info->shared)
1225 continue;
1226
1227 if (ret)
1228 return ret;
1229
1230 attrcount++;
1231 }
1232 }
1233
1234 return attrcount;
1235 }
1236
1237 /**
1238 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1239 * @attr_list: List of IIO device attributes
1240 *
1241 * This function frees the memory allocated for each of the IIO device
1242 * attributes in the list.
1243 */
1244 void iio_free_chan_devattr_list(struct list_head *attr_list)
1245 {
1246 struct iio_dev_attr *p, *n;
1247
1248 list_for_each_entry_safe(p, n, attr_list, l) {
1249 kfree(p->dev_attr.attr.name);
1250 list_del(&p->l);
1251 kfree(p);
1252 }
1253 }
1254
1255 static ssize_t iio_show_dev_name(struct device *dev,
1256 struct device_attribute *attr,
1257 char *buf)
1258 {
1259 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1260 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1261 }
1262
1263 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1264
1265 static ssize_t iio_show_timestamp_clock(struct device *dev,
1266 struct device_attribute *attr,
1267 char *buf)
1268 {
1269 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1270 const clockid_t clk = iio_device_get_clock(indio_dev);
1271 const char *name;
1272 ssize_t sz;
1273
1274 switch (clk) {
1275 case CLOCK_REALTIME:
1276 name = "realtime\n";
1277 sz = sizeof("realtime\n");
1278 break;
1279 case CLOCK_MONOTONIC:
1280 name = "monotonic\n";
1281 sz = sizeof("monotonic\n");
1282 break;
1283 case CLOCK_MONOTONIC_RAW:
1284 name = "monotonic_raw\n";
1285 sz = sizeof("monotonic_raw\n");
1286 break;
1287 case CLOCK_REALTIME_COARSE:
1288 name = "realtime_coarse\n";
1289 sz = sizeof("realtime_coarse\n");
1290 break;
1291 case CLOCK_MONOTONIC_COARSE:
1292 name = "monotonic_coarse\n";
1293 sz = sizeof("monotonic_coarse\n");
1294 break;
1295 case CLOCK_BOOTTIME:
1296 name = "boottime\n";
1297 sz = sizeof("boottime\n");
1298 break;
1299 case CLOCK_TAI:
1300 name = "tai\n";
1301 sz = sizeof("tai\n");
1302 break;
1303 default:
1304 BUG();
1305 }
1306
1307 memcpy(buf, name, sz);
1308 return sz;
1309 }
1310
1311 static ssize_t iio_store_timestamp_clock(struct device *dev,
1312 struct device_attribute *attr,
1313 const char *buf, size_t len)
1314 {
1315 clockid_t clk;
1316 int ret;
1317
1318 if (sysfs_streq(buf, "realtime"))
1319 clk = CLOCK_REALTIME;
1320 else if (sysfs_streq(buf, "monotonic"))
1321 clk = CLOCK_MONOTONIC;
1322 else if (sysfs_streq(buf, "monotonic_raw"))
1323 clk = CLOCK_MONOTONIC_RAW;
1324 else if (sysfs_streq(buf, "realtime_coarse"))
1325 clk = CLOCK_REALTIME_COARSE;
1326 else if (sysfs_streq(buf, "monotonic_coarse"))
1327 clk = CLOCK_MONOTONIC_COARSE;
1328 else if (sysfs_streq(buf, "boottime"))
1329 clk = CLOCK_BOOTTIME;
1330 else if (sysfs_streq(buf, "tai"))
1331 clk = CLOCK_TAI;
1332 else
1333 return -EINVAL;
1334
1335 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1336 if (ret)
1337 return ret;
1338
1339 return len;
1340 }
1341
1342 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1343 iio_show_timestamp_clock, iio_store_timestamp_clock);
1344
1345 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1346 {
1347 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1348 struct iio_dev_attr *p;
1349 struct attribute **attr, *clk = NULL;
1350
1351 /* First count elements in any existing group */
1352 if (indio_dev->info->attrs) {
1353 attr = indio_dev->info->attrs->attrs;
1354 while (*attr++ != NULL)
1355 attrcount_orig++;
1356 }
1357 attrcount = attrcount_orig;
1358 /*
1359 * New channel registration method - relies on the fact a group does
1360 * not need to be initialized if its name is NULL.
1361 */
1362 if (indio_dev->channels)
1363 for (i = 0; i < indio_dev->num_channels; i++) {
1364 const struct iio_chan_spec *chan =
1365 &indio_dev->channels[i];
1366
1367 if (chan->type == IIO_TIMESTAMP)
1368 clk = &dev_attr_current_timestamp_clock.attr;
1369
1370 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1371 if (ret < 0)
1372 goto error_clear_attrs;
1373 attrcount += ret;
1374 }
1375
1376 if (indio_dev->event_interface)
1377 clk = &dev_attr_current_timestamp_clock.attr;
1378
1379 if (indio_dev->name)
1380 attrcount++;
1381 if (clk)
1382 attrcount++;
1383
1384 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1385 sizeof(indio_dev->chan_attr_group.attrs[0]),
1386 GFP_KERNEL);
1387 if (indio_dev->chan_attr_group.attrs == NULL) {
1388 ret = -ENOMEM;
1389 goto error_clear_attrs;
1390 }
1391 /* Copy across original attributes */
1392 if (indio_dev->info->attrs)
1393 memcpy(indio_dev->chan_attr_group.attrs,
1394 indio_dev->info->attrs->attrs,
1395 sizeof(indio_dev->chan_attr_group.attrs[0])
1396 *attrcount_orig);
1397 attrn = attrcount_orig;
1398 /* Add all elements from the list. */
1399 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1400 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1401 if (indio_dev->name)
1402 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1403 if (clk)
1404 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1405
1406 indio_dev->groups[indio_dev->groupcounter++] =
1407 &indio_dev->chan_attr_group;
1408
1409 return 0;
1410
1411 error_clear_attrs:
1412 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1413
1414 return ret;
1415 }
1416
1417 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1418 {
1419
1420 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1421 kfree(indio_dev->chan_attr_group.attrs);
1422 indio_dev->chan_attr_group.attrs = NULL;
1423 }
1424
1425 static void iio_dev_release(struct device *device)
1426 {
1427 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1428 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1429 iio_device_unregister_trigger_consumer(indio_dev);
1430 iio_device_unregister_eventset(indio_dev);
1431 iio_device_unregister_sysfs(indio_dev);
1432
1433 iio_buffer_put(indio_dev->buffer);
1434
1435 ida_simple_remove(&iio_ida, indio_dev->id);
1436 kfree(indio_dev);
1437 }
1438
1439 struct device_type iio_device_type = {
1440 .name = "iio_device",
1441 .release = iio_dev_release,
1442 };
1443
1444 /**
1445 * iio_device_alloc() - allocate an iio_dev from a driver
1446 * @sizeof_priv: Space to allocate for private structure.
1447 **/
1448 struct iio_dev *iio_device_alloc(int sizeof_priv)
1449 {
1450 struct iio_dev *dev;
1451 size_t alloc_size;
1452
1453 alloc_size = sizeof(struct iio_dev);
1454 if (sizeof_priv) {
1455 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1456 alloc_size += sizeof_priv;
1457 }
1458 /* ensure 32-byte alignment of whole construct ? */
1459 alloc_size += IIO_ALIGN - 1;
1460
1461 dev = kzalloc(alloc_size, GFP_KERNEL);
1462
1463 if (dev) {
1464 dev->dev.groups = dev->groups;
1465 dev->dev.type = &iio_device_type;
1466 dev->dev.bus = &iio_bus_type;
1467 device_initialize(&dev->dev);
1468 dev_set_drvdata(&dev->dev, (void *)dev);
1469 mutex_init(&dev->mlock);
1470 mutex_init(&dev->info_exist_lock);
1471 INIT_LIST_HEAD(&dev->channel_attr_list);
1472
1473 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1474 if (dev->id < 0) {
1475 /* cannot use a dev_err as the name isn't available */
1476 pr_err("failed to get device id\n");
1477 kfree(dev);
1478 return NULL;
1479 }
1480 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1481 INIT_LIST_HEAD(&dev->buffer_list);
1482 }
1483
1484 return dev;
1485 }
1486 EXPORT_SYMBOL(iio_device_alloc);
1487
1488 /**
1489 * iio_device_free() - free an iio_dev from a driver
1490 * @dev: the iio_dev associated with the device
1491 **/
1492 void iio_device_free(struct iio_dev *dev)
1493 {
1494 if (dev)
1495 put_device(&dev->dev);
1496 }
1497 EXPORT_SYMBOL(iio_device_free);
1498
1499 static void devm_iio_device_release(struct device *dev, void *res)
1500 {
1501 iio_device_free(*(struct iio_dev **)res);
1502 }
1503
1504 int devm_iio_device_match(struct device *dev, void *res, void *data)
1505 {
1506 struct iio_dev **r = res;
1507 if (!r || !*r) {
1508 WARN_ON(!r || !*r);
1509 return 0;
1510 }
1511 return *r == data;
1512 }
1513 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1514
1515 /**
1516 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1517 * @dev: Device to allocate iio_dev for
1518 * @sizeof_priv: Space to allocate for private structure.
1519 *
1520 * Managed iio_device_alloc. iio_dev allocated with this function is
1521 * automatically freed on driver detach.
1522 *
1523 * If an iio_dev allocated with this function needs to be freed separately,
1524 * devm_iio_device_free() must be used.
1525 *
1526 * RETURNS:
1527 * Pointer to allocated iio_dev on success, NULL on failure.
1528 */
1529 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1530 {
1531 struct iio_dev **ptr, *iio_dev;
1532
1533 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1534 GFP_KERNEL);
1535 if (!ptr)
1536 return NULL;
1537
1538 iio_dev = iio_device_alloc(sizeof_priv);
1539 if (iio_dev) {
1540 *ptr = iio_dev;
1541 devres_add(dev, ptr);
1542 } else {
1543 devres_free(ptr);
1544 }
1545
1546 return iio_dev;
1547 }
1548 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1549
1550 /**
1551 * devm_iio_device_free - Resource-managed iio_device_free()
1552 * @dev: Device this iio_dev belongs to
1553 * @iio_dev: the iio_dev associated with the device
1554 *
1555 * Free iio_dev allocated with devm_iio_device_alloc().
1556 */
1557 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1558 {
1559 int rc;
1560
1561 rc = devres_release(dev, devm_iio_device_release,
1562 devm_iio_device_match, iio_dev);
1563 WARN_ON(rc);
1564 }
1565 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1566
1567 /**
1568 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1569 * @inode: Inode structure for identifying the device in the file system
1570 * @filp: File structure for iio device used to keep and later access
1571 * private data
1572 *
1573 * Return: 0 on success or -EBUSY if the device is already opened
1574 **/
1575 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1576 {
1577 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1578 struct iio_dev, chrdev);
1579
1580 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1581 return -EBUSY;
1582
1583 iio_device_get(indio_dev);
1584
1585 filp->private_data = indio_dev;
1586
1587 return 0;
1588 }
1589
1590 /**
1591 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1592 * @inode: Inode structure pointer for the char device
1593 * @filp: File structure pointer for the char device
1594 *
1595 * Return: 0 for successful release
1596 */
1597 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1598 {
1599 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1600 struct iio_dev, chrdev);
1601 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1602 iio_device_put(indio_dev);
1603
1604 return 0;
1605 }
1606
1607 /* Somewhat of a cross file organization violation - ioctls here are actually
1608 * event related */
1609 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1610 {
1611 struct iio_dev *indio_dev = filp->private_data;
1612 int __user *ip = (int __user *)arg;
1613 int fd;
1614
1615 if (!indio_dev->info)
1616 return -ENODEV;
1617
1618 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1619 fd = iio_event_getfd(indio_dev);
1620 if (fd < 0)
1621 return fd;
1622 if (copy_to_user(ip, &fd, sizeof(fd)))
1623 return -EFAULT;
1624 return 0;
1625 }
1626 return -EINVAL;
1627 }
1628
1629 static const struct file_operations iio_buffer_fileops = {
1630 .read = iio_buffer_read_first_n_outer_addr,
1631 .release = iio_chrdev_release,
1632 .open = iio_chrdev_open,
1633 .poll = iio_buffer_poll_addr,
1634 .owner = THIS_MODULE,
1635 .llseek = noop_llseek,
1636 .unlocked_ioctl = iio_ioctl,
1637 .compat_ioctl = iio_ioctl,
1638 };
1639
1640 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1641 {
1642 int i, j;
1643 const struct iio_chan_spec *channels = indio_dev->channels;
1644
1645 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1646 return 0;
1647
1648 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1649 if (channels[i].scan_index < 0)
1650 continue;
1651 for (j = i + 1; j < indio_dev->num_channels; j++)
1652 if (channels[i].scan_index == channels[j].scan_index) {
1653 dev_err(&indio_dev->dev,
1654 "Duplicate scan index %d\n",
1655 channels[i].scan_index);
1656 return -EINVAL;
1657 }
1658 }
1659
1660 return 0;
1661 }
1662
1663 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1664
1665 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1666 {
1667 int ret;
1668
1669 indio_dev->driver_module = this_mod;
1670 /* If the calling driver did not initialize of_node, do it here */
1671 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1672 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1673
1674 ret = iio_check_unique_scan_index(indio_dev);
1675 if (ret < 0)
1676 return ret;
1677
1678 /* configure elements for the chrdev */
1679 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1680
1681 ret = iio_device_register_debugfs(indio_dev);
1682 if (ret) {
1683 dev_err(indio_dev->dev.parent,
1684 "Failed to register debugfs interfaces\n");
1685 return ret;
1686 }
1687
1688 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1689 if (ret) {
1690 dev_err(indio_dev->dev.parent,
1691 "Failed to create buffer sysfs interfaces\n");
1692 goto error_unreg_debugfs;
1693 }
1694
1695 ret = iio_device_register_sysfs(indio_dev);
1696 if (ret) {
1697 dev_err(indio_dev->dev.parent,
1698 "Failed to register sysfs interfaces\n");
1699 goto error_buffer_free_sysfs;
1700 }
1701 ret = iio_device_register_eventset(indio_dev);
1702 if (ret) {
1703 dev_err(indio_dev->dev.parent,
1704 "Failed to register event set\n");
1705 goto error_free_sysfs;
1706 }
1707 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1708 iio_device_register_trigger_consumer(indio_dev);
1709
1710 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1711 indio_dev->setup_ops == NULL)
1712 indio_dev->setup_ops = &noop_ring_setup_ops;
1713
1714 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1715
1716 indio_dev->chrdev.owner = this_mod;
1717
1718 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1719 if (ret < 0)
1720 goto error_unreg_eventset;
1721
1722 return 0;
1723
1724 error_unreg_eventset:
1725 iio_device_unregister_eventset(indio_dev);
1726 error_free_sysfs:
1727 iio_device_unregister_sysfs(indio_dev);
1728 error_buffer_free_sysfs:
1729 iio_buffer_free_sysfs_and_mask(indio_dev);
1730 error_unreg_debugfs:
1731 iio_device_unregister_debugfs(indio_dev);
1732 return ret;
1733 }
1734 EXPORT_SYMBOL(__iio_device_register);
1735
1736 /**
1737 * iio_device_unregister() - unregister a device from the IIO subsystem
1738 * @indio_dev: Device structure representing the device.
1739 **/
1740 void iio_device_unregister(struct iio_dev *indio_dev)
1741 {
1742 mutex_lock(&indio_dev->info_exist_lock);
1743
1744 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1745
1746 iio_device_unregister_debugfs(indio_dev);
1747
1748 iio_disable_all_buffers(indio_dev);
1749
1750 indio_dev->info = NULL;
1751
1752 iio_device_wakeup_eventset(indio_dev);
1753 iio_buffer_wakeup_poll(indio_dev);
1754
1755 mutex_unlock(&indio_dev->info_exist_lock);
1756
1757 iio_buffer_free_sysfs_and_mask(indio_dev);
1758 }
1759 EXPORT_SYMBOL(iio_device_unregister);
1760
1761 static void devm_iio_device_unreg(struct device *dev, void *res)
1762 {
1763 iio_device_unregister(*(struct iio_dev **)res);
1764 }
1765
1766 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1767 struct module *this_mod)
1768 {
1769 struct iio_dev **ptr;
1770 int ret;
1771
1772 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1773 if (!ptr)
1774 return -ENOMEM;
1775
1776 *ptr = indio_dev;
1777 ret = __iio_device_register(indio_dev, this_mod);
1778 if (!ret)
1779 devres_add(dev, ptr);
1780 else
1781 devres_free(ptr);
1782
1783 return ret;
1784 }
1785 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1786
1787 /**
1788 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1789 * @dev: Device this iio_dev belongs to
1790 * @indio_dev: the iio_dev associated with the device
1791 *
1792 * Unregister iio_dev registered with devm_iio_device_register().
1793 */
1794 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1795 {
1796 int rc;
1797
1798 rc = devres_release(dev, devm_iio_device_unreg,
1799 devm_iio_device_match, indio_dev);
1800 WARN_ON(rc);
1801 }
1802 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1803
1804 /**
1805 * iio_device_claim_direct_mode - Keep device in direct mode
1806 * @indio_dev: the iio_dev associated with the device
1807 *
1808 * If the device is in direct mode it is guaranteed to stay
1809 * that way until iio_device_release_direct_mode() is called.
1810 *
1811 * Use with iio_device_release_direct_mode()
1812 *
1813 * Returns: 0 on success, -EBUSY on failure
1814 */
1815 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1816 {
1817 mutex_lock(&indio_dev->mlock);
1818
1819 if (iio_buffer_enabled(indio_dev)) {
1820 mutex_unlock(&indio_dev->mlock);
1821 return -EBUSY;
1822 }
1823 return 0;
1824 }
1825 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1826
1827 /**
1828 * iio_device_release_direct_mode - releases claim on direct mode
1829 * @indio_dev: the iio_dev associated with the device
1830 *
1831 * Release the claim. Device is no longer guaranteed to stay
1832 * in direct mode.
1833 *
1834 * Use with iio_device_claim_direct_mode()
1835 */
1836 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1837 {
1838 mutex_unlock(&indio_dev->mlock);
1839 }
1840 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1841
1842 subsys_initcall(iio_init);
1843 module_exit(iio_exit);
1844
1845 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1846 MODULE_DESCRIPTION("Industrial I/O core");
1847 MODULE_LICENSE("GPL");
ubuntu-bionic-kernel mirror