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Linux 4.19.133
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob49d4b4f1a4574771f63e6db6e2f2815d6f9a70f2
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 [IIO_POSITIONRELATIVE] = "positionrelative",
89 [IIO_PHASE] = "phase",
90 };
91
92 static const char * const iio_modifier_names[] = {
93 [IIO_MOD_X] = "x",
94 [IIO_MOD_Y] = "y",
95 [IIO_MOD_Z] = "z",
96 [IIO_MOD_X_AND_Y] = "x&y",
97 [IIO_MOD_X_AND_Z] = "x&z",
98 [IIO_MOD_Y_AND_Z] = "y&z",
99 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
100 [IIO_MOD_X_OR_Y] = "x|y",
101 [IIO_MOD_X_OR_Z] = "x|z",
102 [IIO_MOD_Y_OR_Z] = "y|z",
103 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
106 [IIO_MOD_LIGHT_BOTH] = "both",
107 [IIO_MOD_LIGHT_IR] = "ir",
108 [IIO_MOD_LIGHT_CLEAR] = "clear",
109 [IIO_MOD_LIGHT_RED] = "red",
110 [IIO_MOD_LIGHT_GREEN] = "green",
111 [IIO_MOD_LIGHT_BLUE] = "blue",
112 [IIO_MOD_LIGHT_UV] = "uv",
113 [IIO_MOD_LIGHT_DUV] = "duv",
114 [IIO_MOD_QUATERNION] = "quaternion",
115 [IIO_MOD_TEMP_AMBIENT] = "ambient",
116 [IIO_MOD_TEMP_OBJECT] = "object",
117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
121 [IIO_MOD_RUNNING] = "running",
122 [IIO_MOD_JOGGING] = "jogging",
123 [IIO_MOD_WALKING] = "walking",
124 [IIO_MOD_STILL] = "still",
125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
126 [IIO_MOD_I] = "i",
127 [IIO_MOD_Q] = "q",
128 [IIO_MOD_CO2] = "co2",
129 [IIO_MOD_VOC] = "voc",
130 };
131
132 /* relies on pairs of these shared then separate */
133 static const char * const iio_chan_info_postfix[] = {
134 [IIO_CHAN_INFO_RAW] = "raw",
135 [IIO_CHAN_INFO_PROCESSED] = "input",
136 [IIO_CHAN_INFO_SCALE] = "scale",
137 [IIO_CHAN_INFO_OFFSET] = "offset",
138 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
139 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
140 [IIO_CHAN_INFO_PEAK] = "peak_raw",
141 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
142 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
143 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
144 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
145 = "filter_low_pass_3db_frequency",
146 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
147 = "filter_high_pass_3db_frequency",
148 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
149 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
150 [IIO_CHAN_INFO_PHASE] = "phase",
151 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
152 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
153 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
154 [IIO_CHAN_INFO_ENABLE] = "en",
155 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
156 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
157 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
158 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
159 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
160 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
161 };
162
163 /**
164 * iio_find_channel_from_si() - get channel from its scan index
165 * @indio_dev: device
166 * @si: scan index to match
167 */
168 const struct iio_chan_spec
169 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
170 {
171 int i;
172
173 for (i = 0; i < indio_dev->num_channels; i++)
174 if (indio_dev->channels[i].scan_index == si)
175 return &indio_dev->channels[i];
176 return NULL;
177 }
178
179 /* This turns up an awful lot */
180 ssize_t iio_read_const_attr(struct device *dev,
181 struct device_attribute *attr,
182 char *buf)
183 {
184 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
185 }
186 EXPORT_SYMBOL(iio_read_const_attr);
187
188 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
189 {
190 int ret;
191 const struct iio_event_interface *ev_int = indio_dev->event_interface;
192
193 ret = mutex_lock_interruptible(&indio_dev->mlock);
194 if (ret)
195 return ret;
196 if ((ev_int && iio_event_enabled(ev_int)) ||
197 iio_buffer_enabled(indio_dev)) {
198 mutex_unlock(&indio_dev->mlock);
199 return -EBUSY;
200 }
201 indio_dev->clock_id = clock_id;
202 mutex_unlock(&indio_dev->mlock);
203
204 return 0;
205 }
206
207 /**
208 * iio_get_time_ns() - utility function to get a time stamp for events etc
209 * @indio_dev: device
210 */
211 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
212 {
213 struct timespec64 tp;
214
215 switch (iio_device_get_clock(indio_dev)) {
216 case CLOCK_REALTIME:
217 return ktime_get_real_ns();
218 case CLOCK_MONOTONIC:
219 return ktime_get_ns();
220 case CLOCK_MONOTONIC_RAW:
221 return ktime_get_raw_ns();
222 case CLOCK_REALTIME_COARSE:
223 return ktime_to_ns(ktime_get_coarse_real());
224 case CLOCK_MONOTONIC_COARSE:
225 ktime_get_coarse_ts64(&tp);
226 return timespec64_to_ns(&tp);
227 case CLOCK_BOOTTIME:
228 return ktime_get_boot_ns();
229 case CLOCK_TAI:
230 return ktime_get_tai_ns();
231 default:
232 BUG();
233 }
234 }
235 EXPORT_SYMBOL(iio_get_time_ns);
236
237 /**
238 * iio_get_time_res() - utility function to get time stamp clock resolution in
239 * nano seconds.
240 * @indio_dev: device
241 */
242 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
243 {
244 switch (iio_device_get_clock(indio_dev)) {
245 case CLOCK_REALTIME:
246 case CLOCK_MONOTONIC:
247 case CLOCK_MONOTONIC_RAW:
248 case CLOCK_BOOTTIME:
249 case CLOCK_TAI:
250 return hrtimer_resolution;
251 case CLOCK_REALTIME_COARSE:
252 case CLOCK_MONOTONIC_COARSE:
253 return LOW_RES_NSEC;
254 default:
255 BUG();
256 }
257 }
258 EXPORT_SYMBOL(iio_get_time_res);
259
260 static int __init iio_init(void)
261 {
262 int ret;
263
264 /* Register sysfs bus */
265 ret = bus_register(&iio_bus_type);
266 if (ret < 0) {
267 pr_err("could not register bus type\n");
268 goto error_nothing;
269 }
270
271 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
272 if (ret < 0) {
273 pr_err("failed to allocate char dev region\n");
274 goto error_unregister_bus_type;
275 }
276
277 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
278
279 return 0;
280
281 error_unregister_bus_type:
282 bus_unregister(&iio_bus_type);
283 error_nothing:
284 return ret;
285 }
286
287 static void __exit iio_exit(void)
288 {
289 if (iio_devt)
290 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
291 bus_unregister(&iio_bus_type);
292 debugfs_remove(iio_debugfs_dentry);
293 }
294
295 #if defined(CONFIG_DEBUG_FS)
296 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
297 size_t count, loff_t *ppos)
298 {
299 struct iio_dev *indio_dev = file->private_data;
300 char buf[20];
301 unsigned val = 0;
302 ssize_t len;
303 int ret;
304
305 ret = indio_dev->info->debugfs_reg_access(indio_dev,
306 indio_dev->cached_reg_addr,
307 0, &val);
308 if (ret) {
309 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
310 return ret;
311 }
312
313 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
314
315 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
316 }
317
318 static ssize_t iio_debugfs_write_reg(struct file *file,
319 const char __user *userbuf, size_t count, loff_t *ppos)
320 {
321 struct iio_dev *indio_dev = file->private_data;
322 unsigned reg, val;
323 char buf[80];
324 int ret;
325
326 count = min_t(size_t, count, (sizeof(buf)-1));
327 if (copy_from_user(buf, userbuf, count))
328 return -EFAULT;
329
330 buf[count] = 0;
331
332 ret = sscanf(buf, "%i %i", &reg, &val);
333
334 switch (ret) {
335 case 1:
336 indio_dev->cached_reg_addr = reg;
337 break;
338 case 2:
339 indio_dev->cached_reg_addr = reg;
340 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
341 val, NULL);
342 if (ret) {
343 dev_err(indio_dev->dev.parent, "%s: write failed\n",
344 __func__);
345 return ret;
346 }
347 break;
348 default:
349 return -EINVAL;
350 }
351
352 return count;
353 }
354
355 static const struct file_operations iio_debugfs_reg_fops = {
356 .open = simple_open,
357 .read = iio_debugfs_read_reg,
358 .write = iio_debugfs_write_reg,
359 };
360
361 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
362 {
363 debugfs_remove_recursive(indio_dev->debugfs_dentry);
364 }
365
366 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
367 {
368 struct dentry *d;
369
370 if (indio_dev->info->debugfs_reg_access == NULL)
371 return 0;
372
373 if (!iio_debugfs_dentry)
374 return 0;
375
376 indio_dev->debugfs_dentry =
377 debugfs_create_dir(dev_name(&indio_dev->dev),
378 iio_debugfs_dentry);
379 if (indio_dev->debugfs_dentry == NULL) {
380 dev_warn(indio_dev->dev.parent,
381 "Failed to create debugfs directory\n");
382 return -EFAULT;
383 }
384
385 d = debugfs_create_file("direct_reg_access", 0644,
386 indio_dev->debugfs_dentry,
387 indio_dev, &iio_debugfs_reg_fops);
388 if (!d) {
389 iio_device_unregister_debugfs(indio_dev);
390 return -ENOMEM;
391 }
392
393 return 0;
394 }
395 #else
396 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
397 {
398 return 0;
399 }
400
401 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
402 {
403 }
404 #endif /* CONFIG_DEBUG_FS */
405
406 static ssize_t iio_read_channel_ext_info(struct device *dev,
407 struct device_attribute *attr,
408 char *buf)
409 {
410 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
411 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
412 const struct iio_chan_spec_ext_info *ext_info;
413
414 ext_info = &this_attr->c->ext_info[this_attr->address];
415
416 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
417 }
418
419 static ssize_t iio_write_channel_ext_info(struct device *dev,
420 struct device_attribute *attr,
421 const char *buf,
422 size_t len)
423 {
424 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
425 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
426 const struct iio_chan_spec_ext_info *ext_info;
427
428 ext_info = &this_attr->c->ext_info[this_attr->address];
429
430 return ext_info->write(indio_dev, ext_info->private,
431 this_attr->c, buf, len);
432 }
433
434 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
435 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
436 {
437 const struct iio_enum *e = (const struct iio_enum *)priv;
438 unsigned int i;
439 size_t len = 0;
440
441 if (!e->num_items)
442 return 0;
443
444 for (i = 0; i < e->num_items; ++i)
445 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
446
447 /* replace last space with a newline */
448 buf[len - 1] = '\n';
449
450 return len;
451 }
452 EXPORT_SYMBOL_GPL(iio_enum_available_read);
453
454 ssize_t iio_enum_read(struct iio_dev *indio_dev,
455 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
456 {
457 const struct iio_enum *e = (const struct iio_enum *)priv;
458 int i;
459
460 if (!e->get)
461 return -EINVAL;
462
463 i = e->get(indio_dev, chan);
464 if (i < 0)
465 return i;
466 else if (i >= e->num_items)
467 return -EINVAL;
468
469 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
470 }
471 EXPORT_SYMBOL_GPL(iio_enum_read);
472
473 ssize_t iio_enum_write(struct iio_dev *indio_dev,
474 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
475 size_t len)
476 {
477 const struct iio_enum *e = (const struct iio_enum *)priv;
478 int ret;
479
480 if (!e->set)
481 return -EINVAL;
482
483 ret = __sysfs_match_string(e->items, e->num_items, buf);
484 if (ret < 0)
485 return ret;
486
487 ret = e->set(indio_dev, chan, ret);
488 return ret ? ret : len;
489 }
490 EXPORT_SYMBOL_GPL(iio_enum_write);
491
492 static const struct iio_mount_matrix iio_mount_idmatrix = {
493 .rotation = {
494 "1", "0", "0",
495 "0", "1", "0",
496 "0", "0", "1"
497 }
498 };
499
500 static int iio_setup_mount_idmatrix(const struct device *dev,
501 struct iio_mount_matrix *matrix)
502 {
503 *matrix = iio_mount_idmatrix;
504 dev_info(dev, "mounting matrix not found: using identity...\n");
505 return 0;
506 }
507
508 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
509 const struct iio_chan_spec *chan, char *buf)
510 {
511 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
512 priv)(indio_dev, chan);
513
514 if (IS_ERR(mtx))
515 return PTR_ERR(mtx);
516
517 if (!mtx)
518 mtx = &iio_mount_idmatrix;
519
520 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
521 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
522 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
523 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
524 }
525 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
526
527 /**
528 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
529 * device-tree "mount-matrix" property
530 * @dev: device the mounting matrix property is assigned to
531 * @propname: device specific mounting matrix property name
532 * @matrix: where to store retrieved matrix
533 *
534 * If device is assigned no mounting matrix property, a default 3x3 identity
535 * matrix will be filled in.
536 *
537 * Return: 0 if success, or a negative error code on failure.
538 */
539 #ifdef CONFIG_OF
540 int of_iio_read_mount_matrix(const struct device *dev,
541 const char *propname,
542 struct iio_mount_matrix *matrix)
543 {
544 if (dev->of_node) {
545 int err = of_property_read_string_array(dev->of_node,
546 propname, matrix->rotation,
547 ARRAY_SIZE(iio_mount_idmatrix.rotation));
548
549 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
550 return 0;
551
552 if (err >= 0)
553 /* Invalid number of matrix entries. */
554 return -EINVAL;
555
556 if (err != -EINVAL)
557 /* Invalid matrix declaration format. */
558 return err;
559 }
560
561 /* Matrix was not declared at all: fallback to identity. */
562 return iio_setup_mount_idmatrix(dev, matrix);
563 }
564 #else
565 int of_iio_read_mount_matrix(const struct device *dev,
566 const char *propname,
567 struct iio_mount_matrix *matrix)
568 {
569 return iio_setup_mount_idmatrix(dev, matrix);
570 }
571 #endif
572 EXPORT_SYMBOL(of_iio_read_mount_matrix);
573
574 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
575 int size, const int *vals)
576 {
577 unsigned long long tmp;
578 int tmp0, tmp1;
579 bool scale_db = false;
580
581 switch (type) {
582 case IIO_VAL_INT:
583 return snprintf(buf, len, "%d", vals[0]);
584 case IIO_VAL_INT_PLUS_MICRO_DB:
585 scale_db = true;
586 /* fall through */
587 case IIO_VAL_INT_PLUS_MICRO:
588 if (vals[1] < 0)
589 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
590 -vals[1], scale_db ? " dB" : "");
591 else
592 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
593 scale_db ? " dB" : "");
594 case IIO_VAL_INT_PLUS_NANO:
595 if (vals[1] < 0)
596 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
597 -vals[1]);
598 else
599 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
600 case IIO_VAL_FRACTIONAL:
601 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
602 tmp1 = vals[1];
603 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
604 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
605 case IIO_VAL_FRACTIONAL_LOG2:
606 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
607 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
608 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
609 case IIO_VAL_INT_MULTIPLE:
610 {
611 int i;
612 int l = 0;
613
614 for (i = 0; i < size; ++i) {
615 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
616 if (l >= len)
617 break;
618 }
619 return l;
620 }
621 default:
622 return 0;
623 }
624 }
625
626 /**
627 * iio_format_value() - Formats a IIO value into its string representation
628 * @buf: The buffer to which the formatted value gets written
629 * which is assumed to be big enough (i.e. PAGE_SIZE).
630 * @type: One of the IIO_VAL_* constants. This decides how the val
631 * and val2 parameters are formatted.
632 * @size: Number of IIO value entries contained in vals
633 * @vals: Pointer to the values, exact meaning depends on the
634 * type parameter.
635 *
636 * Return: 0 by default, a negative number on failure or the
637 * total number of characters written for a type that belongs
638 * to the IIO_VAL_* constant.
639 */
640 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
641 {
642 ssize_t len;
643
644 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
645 if (len >= PAGE_SIZE - 1)
646 return -EFBIG;
647
648 return len + sprintf(buf + len, "\n");
649 }
650 EXPORT_SYMBOL_GPL(iio_format_value);
651
652 static ssize_t iio_read_channel_info(struct device *dev,
653 struct device_attribute *attr,
654 char *buf)
655 {
656 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
657 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
658 int vals[INDIO_MAX_RAW_ELEMENTS];
659 int ret;
660 int val_len = 2;
661
662 if (indio_dev->info->read_raw_multi)
663 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
664 INDIO_MAX_RAW_ELEMENTS,
665 vals, &val_len,
666 this_attr->address);
667 else
668 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
669 &vals[0], &vals[1], this_attr->address);
670
671 if (ret < 0)
672 return ret;
673
674 return iio_format_value(buf, ret, val_len, vals);
675 }
676
677 static ssize_t iio_format_avail_list(char *buf, const int *vals,
678 int type, int length)
679 {
680 int i;
681 ssize_t len = 0;
682
683 switch (type) {
684 case IIO_VAL_INT:
685 for (i = 0; i < length; i++) {
686 len += __iio_format_value(buf + len, PAGE_SIZE - len,
687 type, 1, &vals[i]);
688 if (len >= PAGE_SIZE)
689 return -EFBIG;
690 if (i < length - 1)
691 len += snprintf(buf + len, PAGE_SIZE - len,
692 " ");
693 else
694 len += snprintf(buf + len, PAGE_SIZE - len,
695 "\n");
696 if (len >= PAGE_SIZE)
697 return -EFBIG;
698 }
699 break;
700 default:
701 for (i = 0; i < length / 2; i++) {
702 len += __iio_format_value(buf + len, PAGE_SIZE - len,
703 type, 2, &vals[i * 2]);
704 if (len >= PAGE_SIZE)
705 return -EFBIG;
706 if (i < length / 2 - 1)
707 len += snprintf(buf + len, PAGE_SIZE - len,
708 " ");
709 else
710 len += snprintf(buf + len, PAGE_SIZE - len,
711 "\n");
712 if (len >= PAGE_SIZE)
713 return -EFBIG;
714 }
715 }
716
717 return len;
718 }
719
720 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
721 {
722 int i;
723 ssize_t len;
724
725 len = snprintf(buf, PAGE_SIZE, "[");
726 switch (type) {
727 case IIO_VAL_INT:
728 for (i = 0; i < 3; i++) {
729 len += __iio_format_value(buf + len, PAGE_SIZE - len,
730 type, 1, &vals[i]);
731 if (len >= PAGE_SIZE)
732 return -EFBIG;
733 if (i < 2)
734 len += snprintf(buf + len, PAGE_SIZE - len,
735 " ");
736 else
737 len += snprintf(buf + len, PAGE_SIZE - len,
738 "]\n");
739 if (len >= PAGE_SIZE)
740 return -EFBIG;
741 }
742 break;
743 default:
744 for (i = 0; i < 3; i++) {
745 len += __iio_format_value(buf + len, PAGE_SIZE - len,
746 type, 2, &vals[i * 2]);
747 if (len >= PAGE_SIZE)
748 return -EFBIG;
749 if (i < 2)
750 len += snprintf(buf + len, PAGE_SIZE - len,
751 " ");
752 else
753 len += snprintf(buf + len, PAGE_SIZE - len,
754 "]\n");
755 if (len >= PAGE_SIZE)
756 return -EFBIG;
757 }
758 }
759
760 return len;
761 }
762
763 static ssize_t iio_read_channel_info_avail(struct device *dev,
764 struct device_attribute *attr,
765 char *buf)
766 {
767 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
768 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
769 const int *vals;
770 int ret;
771 int length;
772 int type;
773
774 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
775 &vals, &type, &length,
776 this_attr->address);
777
778 if (ret < 0)
779 return ret;
780 switch (ret) {
781 case IIO_AVAIL_LIST:
782 return iio_format_avail_list(buf, vals, type, length);
783 case IIO_AVAIL_RANGE:
784 return iio_format_avail_range(buf, vals, type);
785 default:
786 return -EINVAL;
787 }
788 }
789
790 /**
791 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
792 * @str: The string to parse
793 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
794 * @integer: The integer part of the number
795 * @fract: The fractional part of the number
796 *
797 * Returns 0 on success, or a negative error code if the string could not be
798 * parsed.
799 */
800 int iio_str_to_fixpoint(const char *str, int fract_mult,
801 int *integer, int *fract)
802 {
803 int i = 0, f = 0;
804 bool integer_part = true, negative = false;
805
806 if (fract_mult == 0) {
807 *fract = 0;
808
809 return kstrtoint(str, 0, integer);
810 }
811
812 if (str[0] == '-') {
813 negative = true;
814 str++;
815 } else if (str[0] == '+') {
816 str++;
817 }
818
819 while (*str) {
820 if ('0' <= *str && *str <= '9') {
821 if (integer_part) {
822 i = i * 10 + *str - '0';
823 } else {
824 f += fract_mult * (*str - '0');
825 fract_mult /= 10;
826 }
827 } else if (*str == '\n') {
828 if (*(str + 1) == '\0')
829 break;
830 else
831 return -EINVAL;
832 } else if (*str == '.' && integer_part) {
833 integer_part = false;
834 } else {
835 return -EINVAL;
836 }
837 str++;
838 }
839
840 if (negative) {
841 if (i)
842 i = -i;
843 else
844 f = -f;
845 }
846
847 *integer = i;
848 *fract = f;
849
850 return 0;
851 }
852 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
853
854 static ssize_t iio_write_channel_info(struct device *dev,
855 struct device_attribute *attr,
856 const char *buf,
857 size_t len)
858 {
859 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
860 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
861 int ret, fract_mult = 100000;
862 int integer, fract;
863
864 /* Assumes decimal - precision based on number of digits */
865 if (!indio_dev->info->write_raw)
866 return -EINVAL;
867
868 if (indio_dev->info->write_raw_get_fmt)
869 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
870 this_attr->c, this_attr->address)) {
871 case IIO_VAL_INT:
872 fract_mult = 0;
873 break;
874 case IIO_VAL_INT_PLUS_MICRO:
875 fract_mult = 100000;
876 break;
877 case IIO_VAL_INT_PLUS_NANO:
878 fract_mult = 100000000;
879 break;
880 default:
881 return -EINVAL;
882 }
883
884 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
885 if (ret)
886 return ret;
887
888 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
889 integer, fract, this_attr->address);
890 if (ret)
891 return ret;
892
893 return len;
894 }
895
896 static
897 int __iio_device_attr_init(struct device_attribute *dev_attr,
898 const char *postfix,
899 struct iio_chan_spec const *chan,
900 ssize_t (*readfunc)(struct device *dev,
901 struct device_attribute *attr,
902 char *buf),
903 ssize_t (*writefunc)(struct device *dev,
904 struct device_attribute *attr,
905 const char *buf,
906 size_t len),
907 enum iio_shared_by shared_by)
908 {
909 int ret = 0;
910 char *name = NULL;
911 char *full_postfix;
912 sysfs_attr_init(&dev_attr->attr);
913
914 /* Build up postfix of <extend_name>_<modifier>_postfix */
915 if (chan->modified && (shared_by == IIO_SEPARATE)) {
916 if (chan->extend_name)
917 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
918 iio_modifier_names[chan
919 ->channel2],
920 chan->extend_name,
921 postfix);
922 else
923 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
924 iio_modifier_names[chan
925 ->channel2],
926 postfix);
927 } else {
928 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
929 full_postfix = kstrdup(postfix, GFP_KERNEL);
930 else
931 full_postfix = kasprintf(GFP_KERNEL,
932 "%s_%s",
933 chan->extend_name,
934 postfix);
935 }
936 if (full_postfix == NULL)
937 return -ENOMEM;
938
939 if (chan->differential) { /* Differential can not have modifier */
940 switch (shared_by) {
941 case IIO_SHARED_BY_ALL:
942 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
943 break;
944 case IIO_SHARED_BY_DIR:
945 name = kasprintf(GFP_KERNEL, "%s_%s",
946 iio_direction[chan->output],
947 full_postfix);
948 break;
949 case IIO_SHARED_BY_TYPE:
950 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
951 iio_direction[chan->output],
952 iio_chan_type_name_spec[chan->type],
953 iio_chan_type_name_spec[chan->type],
954 full_postfix);
955 break;
956 case IIO_SEPARATE:
957 if (!chan->indexed) {
958 WARN(1, "Differential channels must be indexed\n");
959 ret = -EINVAL;
960 goto error_free_full_postfix;
961 }
962 name = kasprintf(GFP_KERNEL,
963 "%s_%s%d-%s%d_%s",
964 iio_direction[chan->output],
965 iio_chan_type_name_spec[chan->type],
966 chan->channel,
967 iio_chan_type_name_spec[chan->type],
968 chan->channel2,
969 full_postfix);
970 break;
971 }
972 } else { /* Single ended */
973 switch (shared_by) {
974 case IIO_SHARED_BY_ALL:
975 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
976 break;
977 case IIO_SHARED_BY_DIR:
978 name = kasprintf(GFP_KERNEL, "%s_%s",
979 iio_direction[chan->output],
980 full_postfix);
981 break;
982 case IIO_SHARED_BY_TYPE:
983 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
984 iio_direction[chan->output],
985 iio_chan_type_name_spec[chan->type],
986 full_postfix);
987 break;
988
989 case IIO_SEPARATE:
990 if (chan->indexed)
991 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
992 iio_direction[chan->output],
993 iio_chan_type_name_spec[chan->type],
994 chan->channel,
995 full_postfix);
996 else
997 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
998 iio_direction[chan->output],
999 iio_chan_type_name_spec[chan->type],
1000 full_postfix);
1001 break;
1002 }
1003 }
1004 if (name == NULL) {
1005 ret = -ENOMEM;
1006 goto error_free_full_postfix;
1007 }
1008 dev_attr->attr.name = name;
1009
1010 if (readfunc) {
1011 dev_attr->attr.mode |= S_IRUGO;
1012 dev_attr->show = readfunc;
1013 }
1014
1015 if (writefunc) {
1016 dev_attr->attr.mode |= S_IWUSR;
1017 dev_attr->store = writefunc;
1018 }
1019
1020 error_free_full_postfix:
1021 kfree(full_postfix);
1022
1023 return ret;
1024 }
1025
1026 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1027 {
1028 kfree(dev_attr->attr.name);
1029 }
1030
1031 int __iio_add_chan_devattr(const char *postfix,
1032 struct iio_chan_spec const *chan,
1033 ssize_t (*readfunc)(struct device *dev,
1034 struct device_attribute *attr,
1035 char *buf),
1036 ssize_t (*writefunc)(struct device *dev,
1037 struct device_attribute *attr,
1038 const char *buf,
1039 size_t len),
1040 u64 mask,
1041 enum iio_shared_by shared_by,
1042 struct device *dev,
1043 struct list_head *attr_list)
1044 {
1045 int ret;
1046 struct iio_dev_attr *iio_attr, *t;
1047
1048 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1049 if (iio_attr == NULL)
1050 return -ENOMEM;
1051 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1052 postfix, chan,
1053 readfunc, writefunc, shared_by);
1054 if (ret)
1055 goto error_iio_dev_attr_free;
1056 iio_attr->c = chan;
1057 iio_attr->address = mask;
1058 list_for_each_entry(t, attr_list, l)
1059 if (strcmp(t->dev_attr.attr.name,
1060 iio_attr->dev_attr.attr.name) == 0) {
1061 if (shared_by == IIO_SEPARATE)
1062 dev_err(dev, "tried to double register : %s\n",
1063 t->dev_attr.attr.name);
1064 ret = -EBUSY;
1065 goto error_device_attr_deinit;
1066 }
1067 list_add(&iio_attr->l, attr_list);
1068
1069 return 0;
1070
1071 error_device_attr_deinit:
1072 __iio_device_attr_deinit(&iio_attr->dev_attr);
1073 error_iio_dev_attr_free:
1074 kfree(iio_attr);
1075 return ret;
1076 }
1077
1078 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1079 struct iio_chan_spec const *chan,
1080 enum iio_shared_by shared_by,
1081 const long *infomask)
1082 {
1083 int i, ret, attrcount = 0;
1084
1085 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1086 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1087 return -EINVAL;
1088 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1089 chan,
1090 &iio_read_channel_info,
1091 &iio_write_channel_info,
1092 i,
1093 shared_by,
1094 &indio_dev->dev,
1095 &indio_dev->channel_attr_list);
1096 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1097 continue;
1098 else if (ret < 0)
1099 return ret;
1100 attrcount++;
1101 }
1102
1103 return attrcount;
1104 }
1105
1106 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1107 struct iio_chan_spec const *chan,
1108 enum iio_shared_by shared_by,
1109 const long *infomask)
1110 {
1111 int i, ret, attrcount = 0;
1112 char *avail_postfix;
1113
1114 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1115 avail_postfix = kasprintf(GFP_KERNEL,
1116 "%s_available",
1117 iio_chan_info_postfix[i]);
1118 if (!avail_postfix)
1119 return -ENOMEM;
1120
1121 ret = __iio_add_chan_devattr(avail_postfix,
1122 chan,
1123 &iio_read_channel_info_avail,
1124 NULL,
1125 i,
1126 shared_by,
1127 &indio_dev->dev,
1128 &indio_dev->channel_attr_list);
1129 kfree(avail_postfix);
1130 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1131 continue;
1132 else if (ret < 0)
1133 return ret;
1134 attrcount++;
1135 }
1136
1137 return attrcount;
1138 }
1139
1140 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1141 struct iio_chan_spec const *chan)
1142 {
1143 int ret, attrcount = 0;
1144 const struct iio_chan_spec_ext_info *ext_info;
1145
1146 if (chan->channel < 0)
1147 return 0;
1148 ret = iio_device_add_info_mask_type(indio_dev, chan,
1149 IIO_SEPARATE,
1150 &chan->info_mask_separate);
1151 if (ret < 0)
1152 return ret;
1153 attrcount += ret;
1154
1155 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1156 IIO_SEPARATE,
1157 &chan->
1158 info_mask_separate_available);
1159 if (ret < 0)
1160 return ret;
1161 attrcount += ret;
1162
1163 ret = iio_device_add_info_mask_type(indio_dev, chan,
1164 IIO_SHARED_BY_TYPE,
1165 &chan->info_mask_shared_by_type);
1166 if (ret < 0)
1167 return ret;
1168 attrcount += ret;
1169
1170 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1171 IIO_SHARED_BY_TYPE,
1172 &chan->
1173 info_mask_shared_by_type_available);
1174 if (ret < 0)
1175 return ret;
1176 attrcount += ret;
1177
1178 ret = iio_device_add_info_mask_type(indio_dev, chan,
1179 IIO_SHARED_BY_DIR,
1180 &chan->info_mask_shared_by_dir);
1181 if (ret < 0)
1182 return ret;
1183 attrcount += ret;
1184
1185 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1186 IIO_SHARED_BY_DIR,
1187 &chan->info_mask_shared_by_dir_available);
1188 if (ret < 0)
1189 return ret;
1190 attrcount += ret;
1191
1192 ret = iio_device_add_info_mask_type(indio_dev, chan,
1193 IIO_SHARED_BY_ALL,
1194 &chan->info_mask_shared_by_all);
1195 if (ret < 0)
1196 return ret;
1197 attrcount += ret;
1198
1199 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1200 IIO_SHARED_BY_ALL,
1201 &chan->info_mask_shared_by_all_available);
1202 if (ret < 0)
1203 return ret;
1204 attrcount += ret;
1205
1206 if (chan->ext_info) {
1207 unsigned int i = 0;
1208 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1209 ret = __iio_add_chan_devattr(ext_info->name,
1210 chan,
1211 ext_info->read ?
1212 &iio_read_channel_ext_info : NULL,
1213 ext_info->write ?
1214 &iio_write_channel_ext_info : NULL,
1215 i,
1216 ext_info->shared,
1217 &indio_dev->dev,
1218 &indio_dev->channel_attr_list);
1219 i++;
1220 if (ret == -EBUSY && ext_info->shared)
1221 continue;
1222
1223 if (ret)
1224 return ret;
1225
1226 attrcount++;
1227 }
1228 }
1229
1230 return attrcount;
1231 }
1232
1233 /**
1234 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1235 * @attr_list: List of IIO device attributes
1236 *
1237 * This function frees the memory allocated for each of the IIO device
1238 * attributes in the list.
1239 */
1240 void iio_free_chan_devattr_list(struct list_head *attr_list)
1241 {
1242 struct iio_dev_attr *p, *n;
1243
1244 list_for_each_entry_safe(p, n, attr_list, l) {
1245 kfree(p->dev_attr.attr.name);
1246 list_del(&p->l);
1247 kfree(p);
1248 }
1249 }
1250
1251 static ssize_t iio_show_dev_name(struct device *dev,
1252 struct device_attribute *attr,
1253 char *buf)
1254 {
1255 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1256 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1257 }
1258
1259 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1260
1261 static ssize_t iio_show_timestamp_clock(struct device *dev,
1262 struct device_attribute *attr,
1263 char *buf)
1264 {
1265 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1266 const clockid_t clk = iio_device_get_clock(indio_dev);
1267 const char *name;
1268 ssize_t sz;
1269
1270 switch (clk) {
1271 case CLOCK_REALTIME:
1272 name = "realtime\n";
1273 sz = sizeof("realtime\n");
1274 break;
1275 case CLOCK_MONOTONIC:
1276 name = "monotonic\n";
1277 sz = sizeof("monotonic\n");
1278 break;
1279 case CLOCK_MONOTONIC_RAW:
1280 name = "monotonic_raw\n";
1281 sz = sizeof("monotonic_raw\n");
1282 break;
1283 case CLOCK_REALTIME_COARSE:
1284 name = "realtime_coarse\n";
1285 sz = sizeof("realtime_coarse\n");
1286 break;
1287 case CLOCK_MONOTONIC_COARSE:
1288 name = "monotonic_coarse\n";
1289 sz = sizeof("monotonic_coarse\n");
1290 break;
1291 case CLOCK_BOOTTIME:
1292 name = "boottime\n";
1293 sz = sizeof("boottime\n");
1294 break;
1295 case CLOCK_TAI:
1296 name = "tai\n";
1297 sz = sizeof("tai\n");
1298 break;
1299 default:
1300 BUG();
1301 }
1302
1303 memcpy(buf, name, sz);
1304 return sz;
1305 }
1306
1307 static ssize_t iio_store_timestamp_clock(struct device *dev,
1308 struct device_attribute *attr,
1309 const char *buf, size_t len)
1310 {
1311 clockid_t clk;
1312 int ret;
1313
1314 if (sysfs_streq(buf, "realtime"))
1315 clk = CLOCK_REALTIME;
1316 else if (sysfs_streq(buf, "monotonic"))
1317 clk = CLOCK_MONOTONIC;
1318 else if (sysfs_streq(buf, "monotonic_raw"))
1319 clk = CLOCK_MONOTONIC_RAW;
1320 else if (sysfs_streq(buf, "realtime_coarse"))
1321 clk = CLOCK_REALTIME_COARSE;
1322 else if (sysfs_streq(buf, "monotonic_coarse"))
1323 clk = CLOCK_MONOTONIC_COARSE;
1324 else if (sysfs_streq(buf, "boottime"))
1325 clk = CLOCK_BOOTTIME;
1326 else if (sysfs_streq(buf, "tai"))
1327 clk = CLOCK_TAI;
1328 else
1329 return -EINVAL;
1330
1331 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1332 if (ret)
1333 return ret;
1334
1335 return len;
1336 }
1337
1338 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1339 iio_show_timestamp_clock, iio_store_timestamp_clock);
1340
1341 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1342 {
1343 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1344 struct iio_dev_attr *p;
1345 struct attribute **attr, *clk = NULL;
1346
1347 /* First count elements in any existing group */
1348 if (indio_dev->info->attrs) {
1349 attr = indio_dev->info->attrs->attrs;
1350 while (*attr++ != NULL)
1351 attrcount_orig++;
1352 }
1353 attrcount = attrcount_orig;
1354 /*
1355 * New channel registration method - relies on the fact a group does
1356 * not need to be initialized if its name is NULL.
1357 */
1358 if (indio_dev->channels)
1359 for (i = 0; i < indio_dev->num_channels; i++) {
1360 const struct iio_chan_spec *chan =
1361 &indio_dev->channels[i];
1362
1363 if (chan->type == IIO_TIMESTAMP)
1364 clk = &dev_attr_current_timestamp_clock.attr;
1365
1366 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1367 if (ret < 0)
1368 goto error_clear_attrs;
1369 attrcount += ret;
1370 }
1371
1372 if (indio_dev->event_interface)
1373 clk = &dev_attr_current_timestamp_clock.attr;
1374
1375 if (indio_dev->name)
1376 attrcount++;
1377 if (clk)
1378 attrcount++;
1379
1380 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1381 sizeof(indio_dev->chan_attr_group.attrs[0]),
1382 GFP_KERNEL);
1383 if (indio_dev->chan_attr_group.attrs == NULL) {
1384 ret = -ENOMEM;
1385 goto error_clear_attrs;
1386 }
1387 /* Copy across original attributes */
1388 if (indio_dev->info->attrs)
1389 memcpy(indio_dev->chan_attr_group.attrs,
1390 indio_dev->info->attrs->attrs,
1391 sizeof(indio_dev->chan_attr_group.attrs[0])
1392 *attrcount_orig);
1393 attrn = attrcount_orig;
1394 /* Add all elements from the list. */
1395 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1396 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1397 if (indio_dev->name)
1398 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1399 if (clk)
1400 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1401
1402 indio_dev->groups[indio_dev->groupcounter++] =
1403 &indio_dev->chan_attr_group;
1404
1405 return 0;
1406
1407 error_clear_attrs:
1408 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1409
1410 return ret;
1411 }
1412
1413 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1414 {
1415
1416 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1417 kfree(indio_dev->chan_attr_group.attrs);
1418 indio_dev->chan_attr_group.attrs = NULL;
1419 }
1420
1421 static void iio_dev_release(struct device *device)
1422 {
1423 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1424 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1425 iio_device_unregister_trigger_consumer(indio_dev);
1426 iio_device_unregister_eventset(indio_dev);
1427 iio_device_unregister_sysfs(indio_dev);
1428
1429 iio_buffer_put(indio_dev->buffer);
1430
1431 ida_simple_remove(&iio_ida, indio_dev->id);
1432 kfree(indio_dev);
1433 }
1434
1435 struct device_type iio_device_type = {
1436 .name = "iio_device",
1437 .release = iio_dev_release,
1438 };
1439
1440 /**
1441 * iio_device_alloc() - allocate an iio_dev from a driver
1442 * @sizeof_priv: Space to allocate for private structure.
1443 **/
1444 struct iio_dev *iio_device_alloc(int sizeof_priv)
1445 {
1446 struct iio_dev *dev;
1447 size_t alloc_size;
1448
1449 alloc_size = sizeof(struct iio_dev);
1450 if (sizeof_priv) {
1451 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1452 alloc_size += sizeof_priv;
1453 }
1454 /* ensure 32-byte alignment of whole construct ? */
1455 alloc_size += IIO_ALIGN - 1;
1456
1457 dev = kzalloc(alloc_size, GFP_KERNEL);
1458
1459 if (dev) {
1460 dev->dev.groups = dev->groups;
1461 dev->dev.type = &iio_device_type;
1462 dev->dev.bus = &iio_bus_type;
1463 device_initialize(&dev->dev);
1464 dev_set_drvdata(&dev->dev, (void *)dev);
1465 mutex_init(&dev->mlock);
1466 mutex_init(&dev->info_exist_lock);
1467 INIT_LIST_HEAD(&dev->channel_attr_list);
1468
1469 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1470 if (dev->id < 0) {
1471 /* cannot use a dev_err as the name isn't available */
1472 pr_err("failed to get device id\n");
1473 kfree(dev);
1474 return NULL;
1475 }
1476 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1477 INIT_LIST_HEAD(&dev->buffer_list);
1478 }
1479
1480 return dev;
1481 }
1482 EXPORT_SYMBOL(iio_device_alloc);
1483
1484 /**
1485 * iio_device_free() - free an iio_dev from a driver
1486 * @dev: the iio_dev associated with the device
1487 **/
1488 void iio_device_free(struct iio_dev *dev)
1489 {
1490 if (dev)
1491 put_device(&dev->dev);
1492 }
1493 EXPORT_SYMBOL(iio_device_free);
1494
1495 static void devm_iio_device_release(struct device *dev, void *res)
1496 {
1497 iio_device_free(*(struct iio_dev **)res);
1498 }
1499
1500 int devm_iio_device_match(struct device *dev, void *res, void *data)
1501 {
1502 struct iio_dev **r = res;
1503 if (!r || !*r) {
1504 WARN_ON(!r || !*r);
1505 return 0;
1506 }
1507 return *r == data;
1508 }
1509 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1510
1511 /**
1512 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1513 * @dev: Device to allocate iio_dev for
1514 * @sizeof_priv: Space to allocate for private structure.
1515 *
1516 * Managed iio_device_alloc. iio_dev allocated with this function is
1517 * automatically freed on driver detach.
1518 *
1519 * If an iio_dev allocated with this function needs to be freed separately,
1520 * devm_iio_device_free() must be used.
1521 *
1522 * RETURNS:
1523 * Pointer to allocated iio_dev on success, NULL on failure.
1524 */
1525 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1526 {
1527 struct iio_dev **ptr, *iio_dev;
1528
1529 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1530 GFP_KERNEL);
1531 if (!ptr)
1532 return NULL;
1533
1534 iio_dev = iio_device_alloc(sizeof_priv);
1535 if (iio_dev) {
1536 *ptr = iio_dev;
1537 devres_add(dev, ptr);
1538 } else {
1539 devres_free(ptr);
1540 }
1541
1542 return iio_dev;
1543 }
1544 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1545
1546 /**
1547 * devm_iio_device_free - Resource-managed iio_device_free()
1548 * @dev: Device this iio_dev belongs to
1549 * @iio_dev: the iio_dev associated with the device
1550 *
1551 * Free iio_dev allocated with devm_iio_device_alloc().
1552 */
1553 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1554 {
1555 int rc;
1556
1557 rc = devres_release(dev, devm_iio_device_release,
1558 devm_iio_device_match, iio_dev);
1559 WARN_ON(rc);
1560 }
1561 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1562
1563 /**
1564 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1565 * @inode: Inode structure for identifying the device in the file system
1566 * @filp: File structure for iio device used to keep and later access
1567 * private data
1568 *
1569 * Return: 0 on success or -EBUSY if the device is already opened
1570 **/
1571 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1572 {
1573 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1574 struct iio_dev, chrdev);
1575
1576 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1577 return -EBUSY;
1578
1579 iio_device_get(indio_dev);
1580
1581 filp->private_data = indio_dev;
1582
1583 return 0;
1584 }
1585
1586 /**
1587 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1588 * @inode: Inode structure pointer for the char device
1589 * @filp: File structure pointer for the char device
1590 *
1591 * Return: 0 for successful release
1592 */
1593 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1594 {
1595 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1596 struct iio_dev, chrdev);
1597 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1598 iio_device_put(indio_dev);
1599
1600 return 0;
1601 }
1602
1603 /* Somewhat of a cross file organization violation - ioctls here are actually
1604 * event related */
1605 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1606 {
1607 struct iio_dev *indio_dev = filp->private_data;
1608 int __user *ip = (int __user *)arg;
1609 int fd;
1610
1611 if (!indio_dev->info)
1612 return -ENODEV;
1613
1614 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1615 fd = iio_event_getfd(indio_dev);
1616 if (fd < 0)
1617 return fd;
1618 if (copy_to_user(ip, &fd, sizeof(fd)))
1619 return -EFAULT;
1620 return 0;
1621 }
1622 return -EINVAL;
1623 }
1624
1625 static const struct file_operations iio_buffer_fileops = {
1626 .read = iio_buffer_read_first_n_outer_addr,
1627 .release = iio_chrdev_release,
1628 .open = iio_chrdev_open,
1629 .poll = iio_buffer_poll_addr,
1630 .owner = THIS_MODULE,
1631 .llseek = noop_llseek,
1632 .unlocked_ioctl = iio_ioctl,
1633 .compat_ioctl = iio_ioctl,
1634 };
1635
1636 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1637 {
1638 int i, j;
1639 const struct iio_chan_spec *channels = indio_dev->channels;
1640
1641 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1642 return 0;
1643
1644 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1645 if (channels[i].scan_index < 0)
1646 continue;
1647 for (j = i + 1; j < indio_dev->num_channels; j++)
1648 if (channels[i].scan_index == channels[j].scan_index) {
1649 dev_err(&indio_dev->dev,
1650 "Duplicate scan index %d\n",
1651 channels[i].scan_index);
1652 return -EINVAL;
1653 }
1654 }
1655
1656 return 0;
1657 }
1658
1659 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1660
1661 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1662 {
1663 int ret;
1664
1665 indio_dev->driver_module = this_mod;
1666 /* If the calling driver did not initialize of_node, do it here */
1667 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1668 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1669
1670 ret = iio_check_unique_scan_index(indio_dev);
1671 if (ret < 0)
1672 return ret;
1673
1674 /* configure elements for the chrdev */
1675 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1676
1677 ret = iio_device_register_debugfs(indio_dev);
1678 if (ret) {
1679 dev_err(indio_dev->dev.parent,
1680 "Failed to register debugfs interfaces\n");
1681 return ret;
1682 }
1683
1684 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1685 if (ret) {
1686 dev_err(indio_dev->dev.parent,
1687 "Failed to create buffer sysfs interfaces\n");
1688 goto error_unreg_debugfs;
1689 }
1690
1691 ret = iio_device_register_sysfs(indio_dev);
1692 if (ret) {
1693 dev_err(indio_dev->dev.parent,
1694 "Failed to register sysfs interfaces\n");
1695 goto error_buffer_free_sysfs;
1696 }
1697 ret = iio_device_register_eventset(indio_dev);
1698 if (ret) {
1699 dev_err(indio_dev->dev.parent,
1700 "Failed to register event set\n");
1701 goto error_free_sysfs;
1702 }
1703 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1704 iio_device_register_trigger_consumer(indio_dev);
1705
1706 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1707 indio_dev->setup_ops == NULL)
1708 indio_dev->setup_ops = &noop_ring_setup_ops;
1709
1710 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1711
1712 indio_dev->chrdev.owner = this_mod;
1713
1714 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1715 if (ret < 0)
1716 goto error_unreg_eventset;
1717
1718 return 0;
1719
1720 error_unreg_eventset:
1721 iio_device_unregister_eventset(indio_dev);
1722 error_free_sysfs:
1723 iio_device_unregister_sysfs(indio_dev);
1724 error_buffer_free_sysfs:
1725 iio_buffer_free_sysfs_and_mask(indio_dev);
1726 error_unreg_debugfs:
1727 iio_device_unregister_debugfs(indio_dev);
1728 return ret;
1729 }
1730 EXPORT_SYMBOL(__iio_device_register);
1731
1732 /**
1733 * iio_device_unregister() - unregister a device from the IIO subsystem
1734 * @indio_dev: Device structure representing the device.
1735 **/
1736 void iio_device_unregister(struct iio_dev *indio_dev)
1737 {
1738 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1739
1740 mutex_lock(&indio_dev->info_exist_lock);
1741
1742 iio_device_unregister_debugfs(indio_dev);
1743
1744 iio_disable_all_buffers(indio_dev);
1745
1746 indio_dev->info = NULL;
1747
1748 iio_device_wakeup_eventset(indio_dev);
1749 iio_buffer_wakeup_poll(indio_dev);
1750
1751 mutex_unlock(&indio_dev->info_exist_lock);
1752
1753 iio_buffer_free_sysfs_and_mask(indio_dev);
1754 }
1755 EXPORT_SYMBOL(iio_device_unregister);
1756
1757 static void devm_iio_device_unreg(struct device *dev, void *res)
1758 {
1759 iio_device_unregister(*(struct iio_dev **)res);
1760 }
1761
1762 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1763 struct module *this_mod)
1764 {
1765 struct iio_dev **ptr;
1766 int ret;
1767
1768 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1769 if (!ptr)
1770 return -ENOMEM;
1771
1772 *ptr = indio_dev;
1773 ret = __iio_device_register(indio_dev, this_mod);
1774 if (!ret)
1775 devres_add(dev, ptr);
1776 else
1777 devres_free(ptr);
1778
1779 return ret;
1780 }
1781 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1782
1783 /**
1784 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1785 * @dev: Device this iio_dev belongs to
1786 * @indio_dev: the iio_dev associated with the device
1787 *
1788 * Unregister iio_dev registered with devm_iio_device_register().
1789 */
1790 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1791 {
1792 int rc;
1793
1794 rc = devres_release(dev, devm_iio_device_unreg,
1795 devm_iio_device_match, indio_dev);
1796 WARN_ON(rc);
1797 }
1798 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1799
1800 /**
1801 * iio_device_claim_direct_mode - Keep device in direct mode
1802 * @indio_dev: the iio_dev associated with the device
1803 *
1804 * If the device is in direct mode it is guaranteed to stay
1805 * that way until iio_device_release_direct_mode() is called.
1806 *
1807 * Use with iio_device_release_direct_mode()
1808 *
1809 * Returns: 0 on success, -EBUSY on failure
1810 */
1811 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1812 {
1813 mutex_lock(&indio_dev->mlock);
1814
1815 if (iio_buffer_enabled(indio_dev)) {
1816 mutex_unlock(&indio_dev->mlock);
1817 return -EBUSY;
1818 }
1819 return 0;
1820 }
1821 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1822
1823 /**
1824 * iio_device_release_direct_mode - releases claim on direct mode
1825 * @indio_dev: the iio_dev associated with the device
1826 *
1827 * Release the claim. Device is no longer guaranteed to stay
1828 * in direct mode.
1829 *
1830 * Use with iio_device_claim_direct_mode()
1831 */
1832 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1833 {
1834 mutex_unlock(&indio_dev->mlock);
1835 }
1836 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1837
1838 subsys_initcall(iio_init);
1839 module_exit(iio_exit);
1840
1841 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1842 MODULE_DESCRIPTION("Industrial I/O core");
1843 MODULE_LICENSE("GPL");
Linux with added FPC-III support