?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.16.11
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob19bdf3d2962ab9bcc1f8b86bc3d2bb5db5587215
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 /* fall through */
592 case IIO_VAL_INT_PLUS_MICRO:
593 if (vals[1] < 0)
594 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
595 -vals[1], scale_db ? " dB" : "");
596 else
597 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
598 scale_db ? " dB" : "");
599 case IIO_VAL_INT_PLUS_NANO:
600 if (vals[1] < 0)
601 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
602 -vals[1]);
603 else
604 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
605 case IIO_VAL_FRACTIONAL:
606 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
607 tmp1 = vals[1];
608 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
609 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
610 case IIO_VAL_FRACTIONAL_LOG2:
611 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
612 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
613 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
614 case IIO_VAL_INT_MULTIPLE:
615 {
616 int i;
617 int l = 0;
618
619 for (i = 0; i < size; ++i) {
620 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
621 if (l >= len)
622 break;
623 }
624 return l;
625 }
626 default:
627 return 0;
628 }
629 }
630
631 /**
632 * iio_format_value() - Formats a IIO value into its string representation
633 * @buf: The buffer to which the formatted value gets written
634 * which is assumed to be big enough (i.e. PAGE_SIZE).
635 * @type: One of the IIO_VAL_* constants. This decides how the val
636 * and val2 parameters are formatted.
637 * @size: Number of IIO value entries contained in vals
638 * @vals: Pointer to the values, exact meaning depends on the
639 * type parameter.
640 *
641 * Return: 0 by default, a negative number on failure or the
642 * total number of characters written for a type that belongs
643 * to the IIO_VAL_* constant.
644 */
645 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
646 {
647 ssize_t len;
648
649 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
650 if (len >= PAGE_SIZE - 1)
651 return -EFBIG;
652
653 return len + sprintf(buf + len, "\n");
654 }
655 EXPORT_SYMBOL_GPL(iio_format_value);
656
657 static ssize_t iio_read_channel_info(struct device *dev,
658 struct device_attribute *attr,
659 char *buf)
660 {
661 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
662 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
663 int vals[INDIO_MAX_RAW_ELEMENTS];
664 int ret;
665 int val_len = 2;
666
667 if (indio_dev->info->read_raw_multi)
668 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
669 INDIO_MAX_RAW_ELEMENTS,
670 vals, &val_len,
671 this_attr->address);
672 else
673 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
674 &vals[0], &vals[1], this_attr->address);
675
676 if (ret < 0)
677 return ret;
678
679 return iio_format_value(buf, ret, val_len, vals);
680 }
681
682 static ssize_t iio_format_avail_list(char *buf, const int *vals,
683 int type, int length)
684 {
685 int i;
686 ssize_t len = 0;
687
688 switch (type) {
689 case IIO_VAL_INT:
690 for (i = 0; i < length; i++) {
691 len += __iio_format_value(buf + len, PAGE_SIZE - len,
692 type, 1, &vals[i]);
693 if (len >= PAGE_SIZE)
694 return -EFBIG;
695 if (i < length - 1)
696 len += snprintf(buf + len, PAGE_SIZE - len,
697 " ");
698 else
699 len += snprintf(buf + len, PAGE_SIZE - len,
700 "\n");
701 if (len >= PAGE_SIZE)
702 return -EFBIG;
703 }
704 break;
705 default:
706 for (i = 0; i < length / 2; i++) {
707 len += __iio_format_value(buf + len, PAGE_SIZE - len,
708 type, 2, &vals[i * 2]);
709 if (len >= PAGE_SIZE)
710 return -EFBIG;
711 if (i < length / 2 - 1)
712 len += snprintf(buf + len, PAGE_SIZE - len,
713 " ");
714 else
715 len += snprintf(buf + len, PAGE_SIZE - len,
716 "\n");
717 if (len >= PAGE_SIZE)
718 return -EFBIG;
719 }
720 }
721
722 return len;
723 }
724
725 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
726 {
727 int i;
728 ssize_t len;
729
730 len = snprintf(buf, PAGE_SIZE, "[");
731 switch (type) {
732 case IIO_VAL_INT:
733 for (i = 0; i < 3; i++) {
734 len += __iio_format_value(buf + len, PAGE_SIZE - len,
735 type, 1, &vals[i]);
736 if (len >= PAGE_SIZE)
737 return -EFBIG;
738 if (i < 2)
739 len += snprintf(buf + len, PAGE_SIZE - len,
740 " ");
741 else
742 len += snprintf(buf + len, PAGE_SIZE - len,
743 "]\n");
744 if (len >= PAGE_SIZE)
745 return -EFBIG;
746 }
747 break;
748 default:
749 for (i = 0; i < 3; i++) {
750 len += __iio_format_value(buf + len, PAGE_SIZE - len,
751 type, 2, &vals[i * 2]);
752 if (len >= PAGE_SIZE)
753 return -EFBIG;
754 if (i < 2)
755 len += snprintf(buf + len, PAGE_SIZE - len,
756 " ");
757 else
758 len += snprintf(buf + len, PAGE_SIZE - len,
759 "]\n");
760 if (len >= PAGE_SIZE)
761 return -EFBIG;
762 }
763 }
764
765 return len;
766 }
767
768 static ssize_t iio_read_channel_info_avail(struct device *dev,
769 struct device_attribute *attr,
770 char *buf)
771 {
772 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
773 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
774 const int *vals;
775 int ret;
776 int length;
777 int type;
778
779 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
780 &vals, &type, &length,
781 this_attr->address);
782
783 if (ret < 0)
784 return ret;
785 switch (ret) {
786 case IIO_AVAIL_LIST:
787 return iio_format_avail_list(buf, vals, type, length);
788 case IIO_AVAIL_RANGE:
789 return iio_format_avail_range(buf, vals, type);
790 default:
791 return -EINVAL;
792 }
793 }
794
795 /**
796 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
797 * @str: The string to parse
798 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
799 * @integer: The integer part of the number
800 * @fract: The fractional part of the number
801 *
802 * Returns 0 on success, or a negative error code if the string could not be
803 * parsed.
804 */
805 int iio_str_to_fixpoint(const char *str, int fract_mult,
806 int *integer, int *fract)
807 {
808 int i = 0, f = 0;
809 bool integer_part = true, negative = false;
810
811 if (fract_mult == 0) {
812 *fract = 0;
813
814 return kstrtoint(str, 0, integer);
815 }
816
817 if (str[0] == '-') {
818 negative = true;
819 str++;
820 } else if (str[0] == '+') {
821 str++;
822 }
823
824 while (*str) {
825 if ('0' <= *str && *str <= '9') {
826 if (integer_part) {
827 i = i * 10 + *str - '0';
828 } else {
829 f += fract_mult * (*str - '0');
830 fract_mult /= 10;
831 }
832 } else if (*str == '\n') {
833 if (*(str + 1) == '\0')
834 break;
835 else
836 return -EINVAL;
837 } else if (*str == '.' && integer_part) {
838 integer_part = false;
839 } else {
840 return -EINVAL;
841 }
842 str++;
843 }
844
845 if (negative) {
846 if (i)
847 i = -i;
848 else
849 f = -f;
850 }
851
852 *integer = i;
853 *fract = f;
854
855 return 0;
856 }
857 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
858
859 static ssize_t iio_write_channel_info(struct device *dev,
860 struct device_attribute *attr,
861 const char *buf,
862 size_t len)
863 {
864 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
865 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
866 int ret, fract_mult = 100000;
867 int integer, fract;
868
869 /* Assumes decimal - precision based on number of digits */
870 if (!indio_dev->info->write_raw)
871 return -EINVAL;
872
873 if (indio_dev->info->write_raw_get_fmt)
874 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
875 this_attr->c, this_attr->address)) {
876 case IIO_VAL_INT:
877 fract_mult = 0;
878 break;
879 case IIO_VAL_INT_PLUS_MICRO:
880 fract_mult = 100000;
881 break;
882 case IIO_VAL_INT_PLUS_NANO:
883 fract_mult = 100000000;
884 break;
885 default:
886 return -EINVAL;
887 }
888
889 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
890 if (ret)
891 return ret;
892
893 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
894 integer, fract, this_attr->address);
895 if (ret)
896 return ret;
897
898 return len;
899 }
900
901 static
902 int __iio_device_attr_init(struct device_attribute *dev_attr,
903 const char *postfix,
904 struct iio_chan_spec const *chan,
905 ssize_t (*readfunc)(struct device *dev,
906 struct device_attribute *attr,
907 char *buf),
908 ssize_t (*writefunc)(struct device *dev,
909 struct device_attribute *attr,
910 const char *buf,
911 size_t len),
912 enum iio_shared_by shared_by)
913 {
914 int ret = 0;
915 char *name = NULL;
916 char *full_postfix;
917 sysfs_attr_init(&dev_attr->attr);
918
919 /* Build up postfix of <extend_name>_<modifier>_postfix */
920 if (chan->modified && (shared_by == IIO_SEPARATE)) {
921 if (chan->extend_name)
922 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
923 iio_modifier_names[chan
924 ->channel2],
925 chan->extend_name,
926 postfix);
927 else
928 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
929 iio_modifier_names[chan
930 ->channel2],
931 postfix);
932 } else {
933 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
934 full_postfix = kstrdup(postfix, GFP_KERNEL);
935 else
936 full_postfix = kasprintf(GFP_KERNEL,
937 "%s_%s",
938 chan->extend_name,
939 postfix);
940 }
941 if (full_postfix == NULL)
942 return -ENOMEM;
943
944 if (chan->differential) { /* Differential can not have modifier */
945 switch (shared_by) {
946 case IIO_SHARED_BY_ALL:
947 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
948 break;
949 case IIO_SHARED_BY_DIR:
950 name = kasprintf(GFP_KERNEL, "%s_%s",
951 iio_direction[chan->output],
952 full_postfix);
953 break;
954 case IIO_SHARED_BY_TYPE:
955 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
956 iio_direction[chan->output],
957 iio_chan_type_name_spec[chan->type],
958 iio_chan_type_name_spec[chan->type],
959 full_postfix);
960 break;
961 case IIO_SEPARATE:
962 if (!chan->indexed) {
963 WARN(1, "Differential channels must be indexed\n");
964 ret = -EINVAL;
965 goto error_free_full_postfix;
966 }
967 name = kasprintf(GFP_KERNEL,
968 "%s_%s%d-%s%d_%s",
969 iio_direction[chan->output],
970 iio_chan_type_name_spec[chan->type],
971 chan->channel,
972 iio_chan_type_name_spec[chan->type],
973 chan->channel2,
974 full_postfix);
975 break;
976 }
977 } else { /* Single ended */
978 switch (shared_by) {
979 case IIO_SHARED_BY_ALL:
980 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
981 break;
982 case IIO_SHARED_BY_DIR:
983 name = kasprintf(GFP_KERNEL, "%s_%s",
984 iio_direction[chan->output],
985 full_postfix);
986 break;
987 case IIO_SHARED_BY_TYPE:
988 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
989 iio_direction[chan->output],
990 iio_chan_type_name_spec[chan->type],
991 full_postfix);
992 break;
993
994 case IIO_SEPARATE:
995 if (chan->indexed)
996 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
997 iio_direction[chan->output],
998 iio_chan_type_name_spec[chan->type],
999 chan->channel,
1000 full_postfix);
1001 else
1002 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1003 iio_direction[chan->output],
1004 iio_chan_type_name_spec[chan->type],
1005 full_postfix);
1006 break;
1007 }
1008 }
1009 if (name == NULL) {
1010 ret = -ENOMEM;
1011 goto error_free_full_postfix;
1012 }
1013 dev_attr->attr.name = name;
1014
1015 if (readfunc) {
1016 dev_attr->attr.mode |= S_IRUGO;
1017 dev_attr->show = readfunc;
1018 }
1019
1020 if (writefunc) {
1021 dev_attr->attr.mode |= S_IWUSR;
1022 dev_attr->store = writefunc;
1023 }
1024
1025 error_free_full_postfix:
1026 kfree(full_postfix);
1027
1028 return ret;
1029 }
1030
1031 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1032 {
1033 kfree(dev_attr->attr.name);
1034 }
1035
1036 int __iio_add_chan_devattr(const char *postfix,
1037 struct iio_chan_spec const *chan,
1038 ssize_t (*readfunc)(struct device *dev,
1039 struct device_attribute *attr,
1040 char *buf),
1041 ssize_t (*writefunc)(struct device *dev,
1042 struct device_attribute *attr,
1043 const char *buf,
1044 size_t len),
1045 u64 mask,
1046 enum iio_shared_by shared_by,
1047 struct device *dev,
1048 struct list_head *attr_list)
1049 {
1050 int ret;
1051 struct iio_dev_attr *iio_attr, *t;
1052
1053 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1054 if (iio_attr == NULL)
1055 return -ENOMEM;
1056 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1057 postfix, chan,
1058 readfunc, writefunc, shared_by);
1059 if (ret)
1060 goto error_iio_dev_attr_free;
1061 iio_attr->c = chan;
1062 iio_attr->address = mask;
1063 list_for_each_entry(t, attr_list, l)
1064 if (strcmp(t->dev_attr.attr.name,
1065 iio_attr->dev_attr.attr.name) == 0) {
1066 if (shared_by == IIO_SEPARATE)
1067 dev_err(dev, "tried to double register : %s\n",
1068 t->dev_attr.attr.name);
1069 ret = -EBUSY;
1070 goto error_device_attr_deinit;
1071 }
1072 list_add(&iio_attr->l, attr_list);
1073
1074 return 0;
1075
1076 error_device_attr_deinit:
1077 __iio_device_attr_deinit(&iio_attr->dev_attr);
1078 error_iio_dev_attr_free:
1079 kfree(iio_attr);
1080 return ret;
1081 }
1082
1083 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1084 struct iio_chan_spec const *chan,
1085 enum iio_shared_by shared_by,
1086 const long *infomask)
1087 {
1088 int i, ret, attrcount = 0;
1089
1090 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1091 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1092 return -EINVAL;
1093 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1094 chan,
1095 &iio_read_channel_info,
1096 &iio_write_channel_info,
1097 i,
1098 shared_by,
1099 &indio_dev->dev,
1100 &indio_dev->channel_attr_list);
1101 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1102 continue;
1103 else if (ret < 0)
1104 return ret;
1105 attrcount++;
1106 }
1107
1108 return attrcount;
1109 }
1110
1111 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1112 struct iio_chan_spec const *chan,
1113 enum iio_shared_by shared_by,
1114 const long *infomask)
1115 {
1116 int i, ret, attrcount = 0;
1117 char *avail_postfix;
1118
1119 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1120 avail_postfix = kasprintf(GFP_KERNEL,
1121 "%s_available",
1122 iio_chan_info_postfix[i]);
1123 if (!avail_postfix)
1124 return -ENOMEM;
1125
1126 ret = __iio_add_chan_devattr(avail_postfix,
1127 chan,
1128 &iio_read_channel_info_avail,
1129 NULL,
1130 i,
1131 shared_by,
1132 &indio_dev->dev,
1133 &indio_dev->channel_attr_list);
1134 kfree(avail_postfix);
1135 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1136 continue;
1137 else if (ret < 0)
1138 return ret;
1139 attrcount++;
1140 }
1141
1142 return attrcount;
1143 }
1144
1145 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1146 struct iio_chan_spec const *chan)
1147 {
1148 int ret, attrcount = 0;
1149 const struct iio_chan_spec_ext_info *ext_info;
1150
1151 if (chan->channel < 0)
1152 return 0;
1153 ret = iio_device_add_info_mask_type(indio_dev, chan,
1154 IIO_SEPARATE,
1155 &chan->info_mask_separate);
1156 if (ret < 0)
1157 return ret;
1158 attrcount += ret;
1159
1160 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1161 IIO_SEPARATE,
1162 &chan->
1163 info_mask_separate_available);
1164 if (ret < 0)
1165 return ret;
1166 attrcount += ret;
1167
1168 ret = iio_device_add_info_mask_type(indio_dev, chan,
1169 IIO_SHARED_BY_TYPE,
1170 &chan->info_mask_shared_by_type);
1171 if (ret < 0)
1172 return ret;
1173 attrcount += ret;
1174
1175 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1176 IIO_SHARED_BY_TYPE,
1177 &chan->
1178 info_mask_shared_by_type_available);
1179 if (ret < 0)
1180 return ret;
1181 attrcount += ret;
1182
1183 ret = iio_device_add_info_mask_type(indio_dev, chan,
1184 IIO_SHARED_BY_DIR,
1185 &chan->info_mask_shared_by_dir);
1186 if (ret < 0)
1187 return ret;
1188 attrcount += ret;
1189
1190 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1191 IIO_SHARED_BY_DIR,
1192 &chan->info_mask_shared_by_dir_available);
1193 if (ret < 0)
1194 return ret;
1195 attrcount += ret;
1196
1197 ret = iio_device_add_info_mask_type(indio_dev, chan,
1198 IIO_SHARED_BY_ALL,
1199 &chan->info_mask_shared_by_all);
1200 if (ret < 0)
1201 return ret;
1202 attrcount += ret;
1203
1204 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1205 IIO_SHARED_BY_ALL,
1206 &chan->info_mask_shared_by_all_available);
1207 if (ret < 0)
1208 return ret;
1209 attrcount += ret;
1210
1211 if (chan->ext_info) {
1212 unsigned int i = 0;
1213 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1214 ret = __iio_add_chan_devattr(ext_info->name,
1215 chan,
1216 ext_info->read ?
1217 &iio_read_channel_ext_info : NULL,
1218 ext_info->write ?
1219 &iio_write_channel_ext_info : NULL,
1220 i,
1221 ext_info->shared,
1222 &indio_dev->dev,
1223 &indio_dev->channel_attr_list);
1224 i++;
1225 if (ret == -EBUSY && ext_info->shared)
1226 continue;
1227
1228 if (ret)
1229 return ret;
1230
1231 attrcount++;
1232 }
1233 }
1234
1235 return attrcount;
1236 }
1237
1238 /**
1239 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1240 * @attr_list: List of IIO device attributes
1241 *
1242 * This function frees the memory allocated for each of the IIO device
1243 * attributes in the list.
1244 */
1245 void iio_free_chan_devattr_list(struct list_head *attr_list)
1246 {
1247 struct iio_dev_attr *p, *n;
1248
1249 list_for_each_entry_safe(p, n, attr_list, l) {
1250 kfree(p->dev_attr.attr.name);
1251 list_del(&p->l);
1252 kfree(p);
1253 }
1254 }
1255
1256 static ssize_t iio_show_dev_name(struct device *dev,
1257 struct device_attribute *attr,
1258 char *buf)
1259 {
1260 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1261 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1262 }
1263
1264 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1265
1266 static ssize_t iio_show_timestamp_clock(struct device *dev,
1267 struct device_attribute *attr,
1268 char *buf)
1269 {
1270 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1271 const clockid_t clk = iio_device_get_clock(indio_dev);
1272 const char *name;
1273 ssize_t sz;
1274
1275 switch (clk) {
1276 case CLOCK_REALTIME:
1277 name = "realtime\n";
1278 sz = sizeof("realtime\n");
1279 break;
1280 case CLOCK_MONOTONIC:
1281 name = "monotonic\n";
1282 sz = sizeof("monotonic\n");
1283 break;
1284 case CLOCK_MONOTONIC_RAW:
1285 name = "monotonic_raw\n";
1286 sz = sizeof("monotonic_raw\n");
1287 break;
1288 case CLOCK_REALTIME_COARSE:
1289 name = "realtime_coarse\n";
1290 sz = sizeof("realtime_coarse\n");
1291 break;
1292 case CLOCK_MONOTONIC_COARSE:
1293 name = "monotonic_coarse\n";
1294 sz = sizeof("monotonic_coarse\n");
1295 break;
1296 case CLOCK_BOOTTIME:
1297 name = "boottime\n";
1298 sz = sizeof("boottime\n");
1299 break;
1300 case CLOCK_TAI:
1301 name = "tai\n";
1302 sz = sizeof("tai\n");
1303 break;
1304 default:
1305 BUG();
1306 }
1307
1308 memcpy(buf, name, sz);
1309 return sz;
1310 }
1311
1312 static ssize_t iio_store_timestamp_clock(struct device *dev,
1313 struct device_attribute *attr,
1314 const char *buf, size_t len)
1315 {
1316 clockid_t clk;
1317 int ret;
1318
1319 if (sysfs_streq(buf, "realtime"))
1320 clk = CLOCK_REALTIME;
1321 else if (sysfs_streq(buf, "monotonic"))
1322 clk = CLOCK_MONOTONIC;
1323 else if (sysfs_streq(buf, "monotonic_raw"))
1324 clk = CLOCK_MONOTONIC_RAW;
1325 else if (sysfs_streq(buf, "realtime_coarse"))
1326 clk = CLOCK_REALTIME_COARSE;
1327 else if (sysfs_streq(buf, "monotonic_coarse"))
1328 clk = CLOCK_MONOTONIC_COARSE;
1329 else if (sysfs_streq(buf, "boottime"))
1330 clk = CLOCK_BOOTTIME;
1331 else if (sysfs_streq(buf, "tai"))
1332 clk = CLOCK_TAI;
1333 else
1334 return -EINVAL;
1335
1336 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1337 if (ret)
1338 return ret;
1339
1340 return len;
1341 }
1342
1343 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1344 iio_show_timestamp_clock, iio_store_timestamp_clock);
1345
1346 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1347 {
1348 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1349 struct iio_dev_attr *p;
1350 struct attribute **attr, *clk = NULL;
1351
1352 /* First count elements in any existing group */
1353 if (indio_dev->info->attrs) {
1354 attr = indio_dev->info->attrs->attrs;
1355 while (*attr++ != NULL)
1356 attrcount_orig++;
1357 }
1358 attrcount = attrcount_orig;
1359 /*
1360 * New channel registration method - relies on the fact a group does
1361 * not need to be initialized if its name is NULL.
1362 */
1363 if (indio_dev->channels)
1364 for (i = 0; i < indio_dev->num_channels; i++) {
1365 const struct iio_chan_spec *chan =
1366 &indio_dev->channels[i];
1367
1368 if (chan->type == IIO_TIMESTAMP)
1369 clk = &dev_attr_current_timestamp_clock.attr;
1370
1371 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1372 if (ret < 0)
1373 goto error_clear_attrs;
1374 attrcount += ret;
1375 }
1376
1377 if (indio_dev->event_interface)
1378 clk = &dev_attr_current_timestamp_clock.attr;
1379
1380 if (indio_dev->name)
1381 attrcount++;
1382 if (clk)
1383 attrcount++;
1384
1385 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1386 sizeof(indio_dev->chan_attr_group.attrs[0]),
1387 GFP_KERNEL);
1388 if (indio_dev->chan_attr_group.attrs == NULL) {
1389 ret = -ENOMEM;
1390 goto error_clear_attrs;
1391 }
1392 /* Copy across original attributes */
1393 if (indio_dev->info->attrs)
1394 memcpy(indio_dev->chan_attr_group.attrs,
1395 indio_dev->info->attrs->attrs,
1396 sizeof(indio_dev->chan_attr_group.attrs[0])
1397 *attrcount_orig);
1398 attrn = attrcount_orig;
1399 /* Add all elements from the list. */
1400 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1401 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1402 if (indio_dev->name)
1403 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1404 if (clk)
1405 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1406
1407 indio_dev->groups[indio_dev->groupcounter++] =
1408 &indio_dev->chan_attr_group;
1409
1410 return 0;
1411
1412 error_clear_attrs:
1413 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1414
1415 return ret;
1416 }
1417
1418 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1419 {
1420
1421 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1422 kfree(indio_dev->chan_attr_group.attrs);
1423 indio_dev->chan_attr_group.attrs = NULL;
1424 }
1425
1426 static void iio_dev_release(struct device *device)
1427 {
1428 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1429 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1430 iio_device_unregister_trigger_consumer(indio_dev);
1431 iio_device_unregister_eventset(indio_dev);
1432 iio_device_unregister_sysfs(indio_dev);
1433
1434 iio_buffer_put(indio_dev->buffer);
1435
1436 ida_simple_remove(&iio_ida, indio_dev->id);
1437 kfree(indio_dev);
1438 }
1439
1440 struct device_type iio_device_type = {
1441 .name = "iio_device",
1442 .release = iio_dev_release,
1443 };
1444
1445 /**
1446 * iio_device_alloc() - allocate an iio_dev from a driver
1447 * @sizeof_priv: Space to allocate for private structure.
1448 **/
1449 struct iio_dev *iio_device_alloc(int sizeof_priv)
1450 {
1451 struct iio_dev *dev;
1452 size_t alloc_size;
1453
1454 alloc_size = sizeof(struct iio_dev);
1455 if (sizeof_priv) {
1456 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1457 alloc_size += sizeof_priv;
1458 }
1459 /* ensure 32-byte alignment of whole construct ? */
1460 alloc_size += IIO_ALIGN - 1;
1461
1462 dev = kzalloc(alloc_size, GFP_KERNEL);
1463
1464 if (dev) {
1465 dev->dev.groups = dev->groups;
1466 dev->dev.type = &iio_device_type;
1467 dev->dev.bus = &iio_bus_type;
1468 device_initialize(&dev->dev);
1469 dev_set_drvdata(&dev->dev, (void *)dev);
1470 mutex_init(&dev->mlock);
1471 mutex_init(&dev->info_exist_lock);
1472 INIT_LIST_HEAD(&dev->channel_attr_list);
1473
1474 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1475 if (dev->id < 0) {
1476 /* cannot use a dev_err as the name isn't available */
1477 pr_err("failed to get device id\n");
1478 kfree(dev);
1479 return NULL;
1480 }
1481 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1482 INIT_LIST_HEAD(&dev->buffer_list);
1483 }
1484
1485 return dev;
1486 }
1487 EXPORT_SYMBOL(iio_device_alloc);
1488
1489 /**
1490 * iio_device_free() - free an iio_dev from a driver
1491 * @dev: the iio_dev associated with the device
1492 **/
1493 void iio_device_free(struct iio_dev *dev)
1494 {
1495 if (dev)
1496 put_device(&dev->dev);
1497 }
1498 EXPORT_SYMBOL(iio_device_free);
1499
1500 static void devm_iio_device_release(struct device *dev, void *res)
1501 {
1502 iio_device_free(*(struct iio_dev **)res);
1503 }
1504
1505 int devm_iio_device_match(struct device *dev, void *res, void *data)
1506 {
1507 struct iio_dev **r = res;
1508 if (!r || !*r) {
1509 WARN_ON(!r || !*r);
1510 return 0;
1511 }
1512 return *r == data;
1513 }
1514 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1515
1516 /**
1517 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1518 * @dev: Device to allocate iio_dev for
1519 * @sizeof_priv: Space to allocate for private structure.
1520 *
1521 * Managed iio_device_alloc. iio_dev allocated with this function is
1522 * automatically freed on driver detach.
1523 *
1524 * If an iio_dev allocated with this function needs to be freed separately,
1525 * devm_iio_device_free() must be used.
1526 *
1527 * RETURNS:
1528 * Pointer to allocated iio_dev on success, NULL on failure.
1529 */
1530 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1531 {
1532 struct iio_dev **ptr, *iio_dev;
1533
1534 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1535 GFP_KERNEL);
1536 if (!ptr)
1537 return NULL;
1538
1539 iio_dev = iio_device_alloc(sizeof_priv);
1540 if (iio_dev) {
1541 *ptr = iio_dev;
1542 devres_add(dev, ptr);
1543 } else {
1544 devres_free(ptr);
1545 }
1546
1547 return iio_dev;
1548 }
1549 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1550
1551 /**
1552 * devm_iio_device_free - Resource-managed iio_device_free()
1553 * @dev: Device this iio_dev belongs to
1554 * @iio_dev: the iio_dev associated with the device
1555 *
1556 * Free iio_dev allocated with devm_iio_device_alloc().
1557 */
1558 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1559 {
1560 int rc;
1561
1562 rc = devres_release(dev, devm_iio_device_release,
1563 devm_iio_device_match, iio_dev);
1564 WARN_ON(rc);
1565 }
1566 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1567
1568 /**
1569 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1570 * @inode: Inode structure for identifying the device in the file system
1571 * @filp: File structure for iio device used to keep and later access
1572 * private data
1573 *
1574 * Return: 0 on success or -EBUSY if the device is already opened
1575 **/
1576 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1577 {
1578 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1579 struct iio_dev, chrdev);
1580
1581 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1582 return -EBUSY;
1583
1584 iio_device_get(indio_dev);
1585
1586 filp->private_data = indio_dev;
1587
1588 return 0;
1589 }
1590
1591 /**
1592 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1593 * @inode: Inode structure pointer for the char device
1594 * @filp: File structure pointer for the char device
1595 *
1596 * Return: 0 for successful release
1597 */
1598 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1599 {
1600 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1601 struct iio_dev, chrdev);
1602 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1603 iio_device_put(indio_dev);
1604
1605 return 0;
1606 }
1607
1608 /* Somewhat of a cross file organization violation - ioctls here are actually
1609 * event related */
1610 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1611 {
1612 struct iio_dev *indio_dev = filp->private_data;
1613 int __user *ip = (int __user *)arg;
1614 int fd;
1615
1616 if (!indio_dev->info)
1617 return -ENODEV;
1618
1619 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1620 fd = iio_event_getfd(indio_dev);
1621 if (fd < 0)
1622 return fd;
1623 if (copy_to_user(ip, &fd, sizeof(fd)))
1624 return -EFAULT;
1625 return 0;
1626 }
1627 return -EINVAL;
1628 }
1629
1630 static const struct file_operations iio_buffer_fileops = {
1631 .read = iio_buffer_read_first_n_outer_addr,
1632 .release = iio_chrdev_release,
1633 .open = iio_chrdev_open,
1634 .poll = iio_buffer_poll_addr,
1635 .owner = THIS_MODULE,
1636 .llseek = noop_llseek,
1637 .unlocked_ioctl = iio_ioctl,
1638 .compat_ioctl = iio_ioctl,
1639 };
1640
1641 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1642 {
1643 int i, j;
1644 const struct iio_chan_spec *channels = indio_dev->channels;
1645
1646 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1647 return 0;
1648
1649 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1650 if (channels[i].scan_index < 0)
1651 continue;
1652 for (j = i + 1; j < indio_dev->num_channels; j++)
1653 if (channels[i].scan_index == channels[j].scan_index) {
1654 dev_err(&indio_dev->dev,
1655 "Duplicate scan index %d\n",
1656 channels[i].scan_index);
1657 return -EINVAL;
1658 }
1659 }
1660
1661 return 0;
1662 }
1663
1664 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1665
1666 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1667 {
1668 int ret;
1669
1670 indio_dev->driver_module = this_mod;
1671 /* If the calling driver did not initialize of_node, do it here */
1672 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1673 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1674
1675 ret = iio_check_unique_scan_index(indio_dev);
1676 if (ret < 0)
1677 return ret;
1678
1679 /* configure elements for the chrdev */
1680 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1681
1682 ret = iio_device_register_debugfs(indio_dev);
1683 if (ret) {
1684 dev_err(indio_dev->dev.parent,
1685 "Failed to register debugfs interfaces\n");
1686 return ret;
1687 }
1688
1689 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1690 if (ret) {
1691 dev_err(indio_dev->dev.parent,
1692 "Failed to create buffer sysfs interfaces\n");
1693 goto error_unreg_debugfs;
1694 }
1695
1696 ret = iio_device_register_sysfs(indio_dev);
1697 if (ret) {
1698 dev_err(indio_dev->dev.parent,
1699 "Failed to register sysfs interfaces\n");
1700 goto error_buffer_free_sysfs;
1701 }
1702 ret = iio_device_register_eventset(indio_dev);
1703 if (ret) {
1704 dev_err(indio_dev->dev.parent,
1705 "Failed to register event set\n");
1706 goto error_free_sysfs;
1707 }
1708 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1709 iio_device_register_trigger_consumer(indio_dev);
1710
1711 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1712 indio_dev->setup_ops == NULL)
1713 indio_dev->setup_ops = &noop_ring_setup_ops;
1714
1715 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1716
1717 indio_dev->chrdev.owner = this_mod;
1718
1719 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1720 if (ret < 0)
1721 goto error_unreg_eventset;
1722
1723 return 0;
1724
1725 error_unreg_eventset:
1726 iio_device_unregister_eventset(indio_dev);
1727 error_free_sysfs:
1728 iio_device_unregister_sysfs(indio_dev);
1729 error_buffer_free_sysfs:
1730 iio_buffer_free_sysfs_and_mask(indio_dev);
1731 error_unreg_debugfs:
1732 iio_device_unregister_debugfs(indio_dev);
1733 return ret;
1734 }
1735 EXPORT_SYMBOL(__iio_device_register);
1736
1737 /**
1738 * iio_device_unregister() - unregister a device from the IIO subsystem
1739 * @indio_dev: Device structure representing the device.
1740 **/
1741 void iio_device_unregister(struct iio_dev *indio_dev)
1742 {
1743 mutex_lock(&indio_dev->info_exist_lock);
1744
1745 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1746
1747 iio_device_unregister_debugfs(indio_dev);
1748
1749 iio_disable_all_buffers(indio_dev);
1750
1751 indio_dev->info = NULL;
1752
1753 iio_device_wakeup_eventset(indio_dev);
1754 iio_buffer_wakeup_poll(indio_dev);
1755
1756 mutex_unlock(&indio_dev->info_exist_lock);
1757
1758 iio_buffer_free_sysfs_and_mask(indio_dev);
1759 }
1760 EXPORT_SYMBOL(iio_device_unregister);
1761
1762 static void devm_iio_device_unreg(struct device *dev, void *res)
1763 {
1764 iio_device_unregister(*(struct iio_dev **)res);
1765 }
1766
1767 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1768 struct module *this_mod)
1769 {
1770 struct iio_dev **ptr;
1771 int ret;
1772
1773 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1774 if (!ptr)
1775 return -ENOMEM;
1776
1777 *ptr = indio_dev;
1778 ret = __iio_device_register(indio_dev, this_mod);
1779 if (!ret)
1780 devres_add(dev, ptr);
1781 else
1782 devres_free(ptr);
1783
1784 return ret;
1785 }
1786 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1787
1788 /**
1789 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1790 * @dev: Device this iio_dev belongs to
1791 * @indio_dev: the iio_dev associated with the device
1792 *
1793 * Unregister iio_dev registered with devm_iio_device_register().
1794 */
1795 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1796 {
1797 int rc;
1798
1799 rc = devres_release(dev, devm_iio_device_unreg,
1800 devm_iio_device_match, indio_dev);
1801 WARN_ON(rc);
1802 }
1803 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1804
1805 /**
1806 * iio_device_claim_direct_mode - Keep device in direct mode
1807 * @indio_dev: the iio_dev associated with the device
1808 *
1809 * If the device is in direct mode it is guaranteed to stay
1810 * that way until iio_device_release_direct_mode() is called.
1811 *
1812 * Use with iio_device_release_direct_mode()
1813 *
1814 * Returns: 0 on success, -EBUSY on failure
1815 */
1816 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1817 {
1818 mutex_lock(&indio_dev->mlock);
1819
1820 if (iio_buffer_enabled(indio_dev)) {
1821 mutex_unlock(&indio_dev->mlock);
1822 return -EBUSY;
1823 }
1824 return 0;
1825 }
1826 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1827
1828 /**
1829 * iio_device_release_direct_mode - releases claim on direct mode
1830 * @indio_dev: the iio_dev associated with the device
1831 *
1832 * Release the claim. Device is no longer guaranteed to stay
1833 * in direct mode.
1834 *
1835 * Use with iio_device_claim_direct_mode()
1836 */
1837 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1838 {
1839 mutex_unlock(&indio_dev->mlock);
1840 }
1841 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1842
1843 subsys_initcall(iio_init);
1844 module_exit(iio_exit);
1845
1846 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1847 MODULE_DESCRIPTION("Industrial I/O core");
1848 MODULE_LICENSE("GPL");
Linux with added FPC-III support