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Merge tag 'chrome-platform-for-linus-4.13' of git://git.kernel.org/pub/scm/linux...
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob17ec4cee51dc005a9f7cc0efc92a9326a3906a61
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
316 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
317
318 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
319 }
320
321 static ssize_t iio_debugfs_write_reg(struct file *file,
322 const char __user *userbuf, size_t count, loff_t *ppos)
323 {
324 struct iio_dev *indio_dev = file->private_data;
325 unsigned reg, val;
326 char buf[80];
327 int ret;
328
329 count = min_t(size_t, count, (sizeof(buf)-1));
330 if (copy_from_user(buf, userbuf, count))
331 return -EFAULT;
332
333 buf[count] = 0;
334
335 ret = sscanf(buf, "%i %i", &reg, &val);
336
337 switch (ret) {
338 case 1:
339 indio_dev->cached_reg_addr = reg;
340 break;
341 case 2:
342 indio_dev->cached_reg_addr = reg;
343 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
344 val, NULL);
345 if (ret) {
346 dev_err(indio_dev->dev.parent, "%s: write failed\n",
347 __func__);
348 return ret;
349 }
350 break;
351 default:
352 return -EINVAL;
353 }
354
355 return count;
356 }
357
358 static const struct file_operations iio_debugfs_reg_fops = {
359 .open = simple_open,
360 .read = iio_debugfs_read_reg,
361 .write = iio_debugfs_write_reg,
362 };
363
364 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
365 {
366 debugfs_remove_recursive(indio_dev->debugfs_dentry);
367 }
368
369 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
370 {
371 struct dentry *d;
372
373 if (indio_dev->info->debugfs_reg_access == NULL)
374 return 0;
375
376 if (!iio_debugfs_dentry)
377 return 0;
378
379 indio_dev->debugfs_dentry =
380 debugfs_create_dir(dev_name(&indio_dev->dev),
381 iio_debugfs_dentry);
382 if (indio_dev->debugfs_dentry == NULL) {
383 dev_warn(indio_dev->dev.parent,
384 "Failed to create debugfs directory\n");
385 return -EFAULT;
386 }
387
388 d = debugfs_create_file("direct_reg_access", 0644,
389 indio_dev->debugfs_dentry,
390 indio_dev, &iio_debugfs_reg_fops);
391 if (!d) {
392 iio_device_unregister_debugfs(indio_dev);
393 return -ENOMEM;
394 }
395
396 return 0;
397 }
398 #else
399 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
400 {
401 return 0;
402 }
403
404 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
405 {
406 }
407 #endif /* CONFIG_DEBUG_FS */
408
409 static ssize_t iio_read_channel_ext_info(struct device *dev,
410 struct device_attribute *attr,
411 char *buf)
412 {
413 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
414 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
415 const struct iio_chan_spec_ext_info *ext_info;
416
417 ext_info = &this_attr->c->ext_info[this_attr->address];
418
419 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
420 }
421
422 static ssize_t iio_write_channel_ext_info(struct device *dev,
423 struct device_attribute *attr,
424 const char *buf,
425 size_t len)
426 {
427 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
428 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
429 const struct iio_chan_spec_ext_info *ext_info;
430
431 ext_info = &this_attr->c->ext_info[this_attr->address];
432
433 return ext_info->write(indio_dev, ext_info->private,
434 this_attr->c, buf, len);
435 }
436
437 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
438 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
439 {
440 const struct iio_enum *e = (const struct iio_enum *)priv;
441 unsigned int i;
442 size_t len = 0;
443
444 if (!e->num_items)
445 return 0;
446
447 for (i = 0; i < e->num_items; ++i)
448 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
449
450 /* replace last space with a newline */
451 buf[len - 1] = '\n';
452
453 return len;
454 }
455 EXPORT_SYMBOL_GPL(iio_enum_available_read);
456
457 ssize_t iio_enum_read(struct iio_dev *indio_dev,
458 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
459 {
460 const struct iio_enum *e = (const struct iio_enum *)priv;
461 int i;
462
463 if (!e->get)
464 return -EINVAL;
465
466 i = e->get(indio_dev, chan);
467 if (i < 0)
468 return i;
469 else if (i >= e->num_items)
470 return -EINVAL;
471
472 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
473 }
474 EXPORT_SYMBOL_GPL(iio_enum_read);
475
476 ssize_t iio_enum_write(struct iio_dev *indio_dev,
477 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
478 size_t len)
479 {
480 const struct iio_enum *e = (const struct iio_enum *)priv;
481 int ret;
482
483 if (!e->set)
484 return -EINVAL;
485
486 ret = __sysfs_match_string(e->items, e->num_items, buf);
487 if (ret < 0)
488 return ret;
489
490 ret = e->set(indio_dev, chan, ret);
491 return ret ? ret : len;
492 }
493 EXPORT_SYMBOL_GPL(iio_enum_write);
494
495 static const struct iio_mount_matrix iio_mount_idmatrix = {
496 .rotation = {
497 "1", "0", "0",
498 "0", "1", "0",
499 "0", "0", "1"
500 }
501 };
502
503 static int iio_setup_mount_idmatrix(const struct device *dev,
504 struct iio_mount_matrix *matrix)
505 {
506 *matrix = iio_mount_idmatrix;
507 dev_info(dev, "mounting matrix not found: using identity...\n");
508 return 0;
509 }
510
511 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
512 const struct iio_chan_spec *chan, char *buf)
513 {
514 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
515 priv)(indio_dev, chan);
516
517 if (IS_ERR(mtx))
518 return PTR_ERR(mtx);
519
520 if (!mtx)
521 mtx = &iio_mount_idmatrix;
522
523 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
524 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
525 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
526 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
527 }
528 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
529
530 /**
531 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
532 * device-tree "mount-matrix" property
533 * @dev: device the mounting matrix property is assigned to
534 * @propname: device specific mounting matrix property name
535 * @matrix: where to store retrieved matrix
536 *
537 * If device is assigned no mounting matrix property, a default 3x3 identity
538 * matrix will be filled in.
539 *
540 * Return: 0 if success, or a negative error code on failure.
541 */
542 #ifdef CONFIG_OF
543 int of_iio_read_mount_matrix(const struct device *dev,
544 const char *propname,
545 struct iio_mount_matrix *matrix)
546 {
547 if (dev->of_node) {
548 int err = of_property_read_string_array(dev->of_node,
549 propname, matrix->rotation,
550 ARRAY_SIZE(iio_mount_idmatrix.rotation));
551
552 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
553 return 0;
554
555 if (err >= 0)
556 /* Invalid number of matrix entries. */
557 return -EINVAL;
558
559 if (err != -EINVAL)
560 /* Invalid matrix declaration format. */
561 return err;
562 }
563
564 /* Matrix was not declared at all: fallback to identity. */
565 return iio_setup_mount_idmatrix(dev, matrix);
566 }
567 #else
568 int of_iio_read_mount_matrix(const struct device *dev,
569 const char *propname,
570 struct iio_mount_matrix *matrix)
571 {
572 return iio_setup_mount_idmatrix(dev, matrix);
573 }
574 #endif
575 EXPORT_SYMBOL(of_iio_read_mount_matrix);
576
577 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
578 int size, const int *vals)
579 {
580 unsigned long long tmp;
581 int tmp0, tmp1;
582 bool scale_db = false;
583
584 switch (type) {
585 case IIO_VAL_INT:
586 return snprintf(buf, len, "%d", vals[0]);
587 case IIO_VAL_INT_PLUS_MICRO_DB:
588 scale_db = true;
589 case IIO_VAL_INT_PLUS_MICRO:
590 if (vals[1] < 0)
591 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
592 -vals[1], scale_db ? " dB" : "");
593 else
594 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
595 scale_db ? " dB" : "");
596 case IIO_VAL_INT_PLUS_NANO:
597 if (vals[1] < 0)
598 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
599 -vals[1]);
600 else
601 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
602 case IIO_VAL_FRACTIONAL:
603 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
604 tmp1 = vals[1];
605 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
606 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
607 case IIO_VAL_FRACTIONAL_LOG2:
608 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
609 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
610 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
611 case IIO_VAL_INT_MULTIPLE:
612 {
613 int i;
614 int l = 0;
615
616 for (i = 0; i < size; ++i) {
617 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
618 if (l >= len)
619 break;
620 }
621 return l;
622 }
623 default:
624 return 0;
625 }
626 }
627
628 /**
629 * iio_format_value() - Formats a IIO value into its string representation
630 * @buf: The buffer to which the formatted value gets written
631 * which is assumed to be big enough (i.e. PAGE_SIZE).
632 * @type: One of the IIO_VAL_... constants. This decides how the val
633 * and val2 parameters are formatted.
634 * @size: Number of IIO value entries contained in vals
635 * @vals: Pointer to the values, exact meaning depends on the
636 * type parameter.
637 *
638 * Return: 0 by default, a negative number on failure or the
639 * total number of characters written for a type that belongs
640 * to the IIO_VAL_... constant.
641 */
642 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
643 {
644 ssize_t len;
645
646 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
647 if (len >= PAGE_SIZE - 1)
648 return -EFBIG;
649
650 return len + sprintf(buf + len, "\n");
651 }
652 EXPORT_SYMBOL_GPL(iio_format_value);
653
654 static ssize_t iio_read_channel_info(struct device *dev,
655 struct device_attribute *attr,
656 char *buf)
657 {
658 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
659 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
660 int vals[INDIO_MAX_RAW_ELEMENTS];
661 int ret;
662 int val_len = 2;
663
664 if (indio_dev->info->read_raw_multi)
665 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
666 INDIO_MAX_RAW_ELEMENTS,
667 vals, &val_len,
668 this_attr->address);
669 else
670 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
671 &vals[0], &vals[1], this_attr->address);
672
673 if (ret < 0)
674 return ret;
675
676 return iio_format_value(buf, ret, val_len, vals);
677 }
678
679 static ssize_t iio_format_avail_list(char *buf, const int *vals,
680 int type, int length)
681 {
682 int i;
683 ssize_t len = 0;
684
685 switch (type) {
686 case IIO_VAL_INT:
687 for (i = 0; i < length; i++) {
688 len += __iio_format_value(buf + len, PAGE_SIZE - len,
689 type, 1, &vals[i]);
690 if (len >= PAGE_SIZE)
691 return -EFBIG;
692 if (i < length - 1)
693 len += snprintf(buf + len, PAGE_SIZE - len,
694 " ");
695 else
696 len += snprintf(buf + len, PAGE_SIZE - len,
697 "\n");
698 if (len >= PAGE_SIZE)
699 return -EFBIG;
700 }
701 break;
702 default:
703 for (i = 0; i < length / 2; i++) {
704 len += __iio_format_value(buf + len, PAGE_SIZE - len,
705 type, 2, &vals[i * 2]);
706 if (len >= PAGE_SIZE)
707 return -EFBIG;
708 if (i < length / 2 - 1)
709 len += snprintf(buf + len, PAGE_SIZE - len,
710 " ");
711 else
712 len += snprintf(buf + len, PAGE_SIZE - len,
713 "\n");
714 if (len >= PAGE_SIZE)
715 return -EFBIG;
716 }
717 }
718
719 return len;
720 }
721
722 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
723 {
724 int i;
725 ssize_t len;
726
727 len = snprintf(buf, PAGE_SIZE, "[");
728 switch (type) {
729 case IIO_VAL_INT:
730 for (i = 0; i < 3; i++) {
731 len += __iio_format_value(buf + len, PAGE_SIZE - len,
732 type, 1, &vals[i]);
733 if (len >= PAGE_SIZE)
734 return -EFBIG;
735 if (i < 2)
736 len += snprintf(buf + len, PAGE_SIZE - len,
737 " ");
738 else
739 len += snprintf(buf + len, PAGE_SIZE - len,
740 "]\n");
741 if (len >= PAGE_SIZE)
742 return -EFBIG;
743 }
744 break;
745 default:
746 for (i = 0; i < 3; i++) {
747 len += __iio_format_value(buf + len, PAGE_SIZE - len,
748 type, 2, &vals[i * 2]);
749 if (len >= PAGE_SIZE)
750 return -EFBIG;
751 if (i < 2)
752 len += snprintf(buf + len, PAGE_SIZE - len,
753 " ");
754 else
755 len += snprintf(buf + len, PAGE_SIZE - len,
756 "]\n");
757 if (len >= PAGE_SIZE)
758 return -EFBIG;
759 }
760 }
761
762 return len;
763 }
764
765 static ssize_t iio_read_channel_info_avail(struct device *dev,
766 struct device_attribute *attr,
767 char *buf)
768 {
769 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
770 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
771 const int *vals;
772 int ret;
773 int length;
774 int type;
775
776 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
777 &vals, &type, &length,
778 this_attr->address);
779
780 if (ret < 0)
781 return ret;
782 switch (ret) {
783 case IIO_AVAIL_LIST:
784 return iio_format_avail_list(buf, vals, type, length);
785 case IIO_AVAIL_RANGE:
786 return iio_format_avail_range(buf, vals, type);
787 default:
788 return -EINVAL;
789 }
790 }
791
792 /**
793 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
794 * @str: The string to parse
795 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
796 * @integer: The integer part of the number
797 * @fract: The fractional part of the number
798 *
799 * Returns 0 on success, or a negative error code if the string could not be
800 * parsed.
801 */
802 int iio_str_to_fixpoint(const char *str, int fract_mult,
803 int *integer, int *fract)
804 {
805 int i = 0, f = 0;
806 bool integer_part = true, negative = false;
807
808 if (fract_mult == 0) {
809 *fract = 0;
810
811 return kstrtoint(str, 0, integer);
812 }
813
814 if (str[0] == '-') {
815 negative = true;
816 str++;
817 } else if (str[0] == '+') {
818 str++;
819 }
820
821 while (*str) {
822 if ('0' <= *str && *str <= '9') {
823 if (integer_part) {
824 i = i * 10 + *str - '0';
825 } else {
826 f += fract_mult * (*str - '0');
827 fract_mult /= 10;
828 }
829 } else if (*str == '\n') {
830 if (*(str + 1) == '\0')
831 break;
832 else
833 return -EINVAL;
834 } else if (*str == '.' && integer_part) {
835 integer_part = false;
836 } else {
837 return -EINVAL;
838 }
839 str++;
840 }
841
842 if (negative) {
843 if (i)
844 i = -i;
845 else
846 f = -f;
847 }
848
849 *integer = i;
850 *fract = f;
851
852 return 0;
853 }
854 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
855
856 static ssize_t iio_write_channel_info(struct device *dev,
857 struct device_attribute *attr,
858 const char *buf,
859 size_t len)
860 {
861 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
862 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
863 int ret, fract_mult = 100000;
864 int integer, fract;
865
866 /* Assumes decimal - precision based on number of digits */
867 if (!indio_dev->info->write_raw)
868 return -EINVAL;
869
870 if (indio_dev->info->write_raw_get_fmt)
871 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
872 this_attr->c, this_attr->address)) {
873 case IIO_VAL_INT:
874 fract_mult = 0;
875 break;
876 case IIO_VAL_INT_PLUS_MICRO:
877 fract_mult = 100000;
878 break;
879 case IIO_VAL_INT_PLUS_NANO:
880 fract_mult = 100000000;
881 break;
882 default:
883 return -EINVAL;
884 }
885
886 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
887 if (ret)
888 return ret;
889
890 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
891 integer, fract, this_attr->address);
892 if (ret)
893 return ret;
894
895 return len;
896 }
897
898 static
899 int __iio_device_attr_init(struct device_attribute *dev_attr,
900 const char *postfix,
901 struct iio_chan_spec const *chan,
902 ssize_t (*readfunc)(struct device *dev,
903 struct device_attribute *attr,
904 char *buf),
905 ssize_t (*writefunc)(struct device *dev,
906 struct device_attribute *attr,
907 const char *buf,
908 size_t len),
909 enum iio_shared_by shared_by)
910 {
911 int ret = 0;
912 char *name = NULL;
913 char *full_postfix;
914 sysfs_attr_init(&dev_attr->attr);
915
916 /* Build up postfix of <extend_name>_<modifier>_postfix */
917 if (chan->modified && (shared_by == IIO_SEPARATE)) {
918 if (chan->extend_name)
919 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
920 iio_modifier_names[chan
921 ->channel2],
922 chan->extend_name,
923 postfix);
924 else
925 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
926 iio_modifier_names[chan
927 ->channel2],
928 postfix);
929 } else {
930 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
931 full_postfix = kstrdup(postfix, GFP_KERNEL);
932 else
933 full_postfix = kasprintf(GFP_KERNEL,
934 "%s_%s",
935 chan->extend_name,
936 postfix);
937 }
938 if (full_postfix == NULL)
939 return -ENOMEM;
940
941 if (chan->differential) { /* Differential can not have modifier */
942 switch (shared_by) {
943 case IIO_SHARED_BY_ALL:
944 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
945 break;
946 case IIO_SHARED_BY_DIR:
947 name = kasprintf(GFP_KERNEL, "%s_%s",
948 iio_direction[chan->output],
949 full_postfix);
950 break;
951 case IIO_SHARED_BY_TYPE:
952 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
953 iio_direction[chan->output],
954 iio_chan_type_name_spec[chan->type],
955 iio_chan_type_name_spec[chan->type],
956 full_postfix);
957 break;
958 case IIO_SEPARATE:
959 if (!chan->indexed) {
960 WARN(1, "Differential channels must be indexed\n");
961 ret = -EINVAL;
962 goto error_free_full_postfix;
963 }
964 name = kasprintf(GFP_KERNEL,
965 "%s_%s%d-%s%d_%s",
966 iio_direction[chan->output],
967 iio_chan_type_name_spec[chan->type],
968 chan->channel,
969 iio_chan_type_name_spec[chan->type],
970 chan->channel2,
971 full_postfix);
972 break;
973 }
974 } else { /* Single ended */
975 switch (shared_by) {
976 case IIO_SHARED_BY_ALL:
977 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
978 break;
979 case IIO_SHARED_BY_DIR:
980 name = kasprintf(GFP_KERNEL, "%s_%s",
981 iio_direction[chan->output],
982 full_postfix);
983 break;
984 case IIO_SHARED_BY_TYPE:
985 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
986 iio_direction[chan->output],
987 iio_chan_type_name_spec[chan->type],
988 full_postfix);
989 break;
990
991 case IIO_SEPARATE:
992 if (chan->indexed)
993 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
994 iio_direction[chan->output],
995 iio_chan_type_name_spec[chan->type],
996 chan->channel,
997 full_postfix);
998 else
999 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1000 iio_direction[chan->output],
1001 iio_chan_type_name_spec[chan->type],
1002 full_postfix);
1003 break;
1004 }
1005 }
1006 if (name == NULL) {
1007 ret = -ENOMEM;
1008 goto error_free_full_postfix;
1009 }
1010 dev_attr->attr.name = name;
1011
1012 if (readfunc) {
1013 dev_attr->attr.mode |= S_IRUGO;
1014 dev_attr->show = readfunc;
1015 }
1016
1017 if (writefunc) {
1018 dev_attr->attr.mode |= S_IWUSR;
1019 dev_attr->store = writefunc;
1020 }
1021
1022 error_free_full_postfix:
1023 kfree(full_postfix);
1024
1025 return ret;
1026 }
1027
1028 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1029 {
1030 kfree(dev_attr->attr.name);
1031 }
1032
1033 int __iio_add_chan_devattr(const char *postfix,
1034 struct iio_chan_spec const *chan,
1035 ssize_t (*readfunc)(struct device *dev,
1036 struct device_attribute *attr,
1037 char *buf),
1038 ssize_t (*writefunc)(struct device *dev,
1039 struct device_attribute *attr,
1040 const char *buf,
1041 size_t len),
1042 u64 mask,
1043 enum iio_shared_by shared_by,
1044 struct device *dev,
1045 struct list_head *attr_list)
1046 {
1047 int ret;
1048 struct iio_dev_attr *iio_attr, *t;
1049
1050 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1051 if (iio_attr == NULL)
1052 return -ENOMEM;
1053 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1054 postfix, chan,
1055 readfunc, writefunc, shared_by);
1056 if (ret)
1057 goto error_iio_dev_attr_free;
1058 iio_attr->c = chan;
1059 iio_attr->address = mask;
1060 list_for_each_entry(t, attr_list, l)
1061 if (strcmp(t->dev_attr.attr.name,
1062 iio_attr->dev_attr.attr.name) == 0) {
1063 if (shared_by == IIO_SEPARATE)
1064 dev_err(dev, "tried to double register : %s\n",
1065 t->dev_attr.attr.name);
1066 ret = -EBUSY;
1067 goto error_device_attr_deinit;
1068 }
1069 list_add(&iio_attr->l, attr_list);
1070
1071 return 0;
1072
1073 error_device_attr_deinit:
1074 __iio_device_attr_deinit(&iio_attr->dev_attr);
1075 error_iio_dev_attr_free:
1076 kfree(iio_attr);
1077 return ret;
1078 }
1079
1080 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1081 struct iio_chan_spec const *chan,
1082 enum iio_shared_by shared_by,
1083 const long *infomask)
1084 {
1085 int i, ret, attrcount = 0;
1086
1087 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1088 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1089 return -EINVAL;
1090 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1091 chan,
1092 &iio_read_channel_info,
1093 &iio_write_channel_info,
1094 i,
1095 shared_by,
1096 &indio_dev->dev,
1097 &indio_dev->channel_attr_list);
1098 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1099 continue;
1100 else if (ret < 0)
1101 return ret;
1102 attrcount++;
1103 }
1104
1105 return attrcount;
1106 }
1107
1108 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1109 struct iio_chan_spec const *chan,
1110 enum iio_shared_by shared_by,
1111 const long *infomask)
1112 {
1113 int i, ret, attrcount = 0;
1114 char *avail_postfix;
1115
1116 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1117 avail_postfix = kasprintf(GFP_KERNEL,
1118 "%s_available",
1119 iio_chan_info_postfix[i]);
1120 if (!avail_postfix)
1121 return -ENOMEM;
1122
1123 ret = __iio_add_chan_devattr(avail_postfix,
1124 chan,
1125 &iio_read_channel_info_avail,
1126 NULL,
1127 i,
1128 shared_by,
1129 &indio_dev->dev,
1130 &indio_dev->channel_attr_list);
1131 kfree(avail_postfix);
1132 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1133 continue;
1134 else if (ret < 0)
1135 return ret;
1136 attrcount++;
1137 }
1138
1139 return attrcount;
1140 }
1141
1142 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1143 struct iio_chan_spec const *chan)
1144 {
1145 int ret, attrcount = 0;
1146 const struct iio_chan_spec_ext_info *ext_info;
1147
1148 if (chan->channel < 0)
1149 return 0;
1150 ret = iio_device_add_info_mask_type(indio_dev, chan,
1151 IIO_SEPARATE,
1152 &chan->info_mask_separate);
1153 if (ret < 0)
1154 return ret;
1155 attrcount += ret;
1156
1157 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1158 IIO_SEPARATE,
1159 &chan->
1160 info_mask_separate_available);
1161 if (ret < 0)
1162 return ret;
1163 attrcount += ret;
1164
1165 ret = iio_device_add_info_mask_type(indio_dev, chan,
1166 IIO_SHARED_BY_TYPE,
1167 &chan->info_mask_shared_by_type);
1168 if (ret < 0)
1169 return ret;
1170 attrcount += ret;
1171
1172 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1173 IIO_SHARED_BY_TYPE,
1174 &chan->
1175 info_mask_shared_by_type_available);
1176 if (ret < 0)
1177 return ret;
1178 attrcount += ret;
1179
1180 ret = iio_device_add_info_mask_type(indio_dev, chan,
1181 IIO_SHARED_BY_DIR,
1182 &chan->info_mask_shared_by_dir);
1183 if (ret < 0)
1184 return ret;
1185 attrcount += ret;
1186
1187 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1188 IIO_SHARED_BY_DIR,
1189 &chan->info_mask_shared_by_dir_available);
1190 if (ret < 0)
1191 return ret;
1192 attrcount += ret;
1193
1194 ret = iio_device_add_info_mask_type(indio_dev, chan,
1195 IIO_SHARED_BY_ALL,
1196 &chan->info_mask_shared_by_all);
1197 if (ret < 0)
1198 return ret;
1199 attrcount += ret;
1200
1201 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1202 IIO_SHARED_BY_ALL,
1203 &chan->info_mask_shared_by_all_available);
1204 if (ret < 0)
1205 return ret;
1206 attrcount += ret;
1207
1208 if (chan->ext_info) {
1209 unsigned int i = 0;
1210 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1211 ret = __iio_add_chan_devattr(ext_info->name,
1212 chan,
1213 ext_info->read ?
1214 &iio_read_channel_ext_info : NULL,
1215 ext_info->write ?
1216 &iio_write_channel_ext_info : NULL,
1217 i,
1218 ext_info->shared,
1219 &indio_dev->dev,
1220 &indio_dev->channel_attr_list);
1221 i++;
1222 if (ret == -EBUSY && ext_info->shared)
1223 continue;
1224
1225 if (ret)
1226 return ret;
1227
1228 attrcount++;
1229 }
1230 }
1231
1232 return attrcount;
1233 }
1234
1235 /**
1236 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1237 * @attr_list: List of IIO device attributes
1238 *
1239 * This function frees the memory allocated for each of the IIO device
1240 * attributes in the list.
1241 */
1242 void iio_free_chan_devattr_list(struct list_head *attr_list)
1243 {
1244 struct iio_dev_attr *p, *n;
1245
1246 list_for_each_entry_safe(p, n, attr_list, l) {
1247 kfree(p->dev_attr.attr.name);
1248 list_del(&p->l);
1249 kfree(p);
1250 }
1251 }
1252
1253 static ssize_t iio_show_dev_name(struct device *dev,
1254 struct device_attribute *attr,
1255 char *buf)
1256 {
1257 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1258 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1259 }
1260
1261 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1262
1263 static ssize_t iio_show_timestamp_clock(struct device *dev,
1264 struct device_attribute *attr,
1265 char *buf)
1266 {
1267 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1268 const clockid_t clk = iio_device_get_clock(indio_dev);
1269 const char *name;
1270 ssize_t sz;
1271
1272 switch (clk) {
1273 case CLOCK_REALTIME:
1274 name = "realtime\n";
1275 sz = sizeof("realtime\n");
1276 break;
1277 case CLOCK_MONOTONIC:
1278 name = "monotonic\n";
1279 sz = sizeof("monotonic\n");
1280 break;
1281 case CLOCK_MONOTONIC_RAW:
1282 name = "monotonic_raw\n";
1283 sz = sizeof("monotonic_raw\n");
1284 break;
1285 case CLOCK_REALTIME_COARSE:
1286 name = "realtime_coarse\n";
1287 sz = sizeof("realtime_coarse\n");
1288 break;
1289 case CLOCK_MONOTONIC_COARSE:
1290 name = "monotonic_coarse\n";
1291 sz = sizeof("monotonic_coarse\n");
1292 break;
1293 case CLOCK_BOOTTIME:
1294 name = "boottime\n";
1295 sz = sizeof("boottime\n");
1296 break;
1297 case CLOCK_TAI:
1298 name = "tai\n";
1299 sz = sizeof("tai\n");
1300 break;
1301 default:
1302 BUG();
1303 }
1304
1305 memcpy(buf, name, sz);
1306 return sz;
1307 }
1308
1309 static ssize_t iio_store_timestamp_clock(struct device *dev,
1310 struct device_attribute *attr,
1311 const char *buf, size_t len)
1312 {
1313 clockid_t clk;
1314 int ret;
1315
1316 if (sysfs_streq(buf, "realtime"))
1317 clk = CLOCK_REALTIME;
1318 else if (sysfs_streq(buf, "monotonic"))
1319 clk = CLOCK_MONOTONIC;
1320 else if (sysfs_streq(buf, "monotonic_raw"))
1321 clk = CLOCK_MONOTONIC_RAW;
1322 else if (sysfs_streq(buf, "realtime_coarse"))
1323 clk = CLOCK_REALTIME_COARSE;
1324 else if (sysfs_streq(buf, "monotonic_coarse"))
1325 clk = CLOCK_MONOTONIC_COARSE;
1326 else if (sysfs_streq(buf, "boottime"))
1327 clk = CLOCK_BOOTTIME;
1328 else if (sysfs_streq(buf, "tai"))
1329 clk = CLOCK_TAI;
1330 else
1331 return -EINVAL;
1332
1333 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1334 if (ret)
1335 return ret;
1336
1337 return len;
1338 }
1339
1340 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1341 iio_show_timestamp_clock, iio_store_timestamp_clock);
1342
1343 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1344 {
1345 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1346 struct iio_dev_attr *p;
1347 struct attribute **attr, *clk = NULL;
1348
1349 /* First count elements in any existing group */
1350 if (indio_dev->info->attrs) {
1351 attr = indio_dev->info->attrs->attrs;
1352 while (*attr++ != NULL)
1353 attrcount_orig++;
1354 }
1355 attrcount = attrcount_orig;
1356 /*
1357 * New channel registration method - relies on the fact a group does
1358 * not need to be initialized if its name is NULL.
1359 */
1360 if (indio_dev->channels)
1361 for (i = 0; i < indio_dev->num_channels; i++) {
1362 const struct iio_chan_spec *chan =
1363 &indio_dev->channels[i];
1364
1365 if (chan->type == IIO_TIMESTAMP)
1366 clk = &dev_attr_current_timestamp_clock.attr;
1367
1368 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1369 if (ret < 0)
1370 goto error_clear_attrs;
1371 attrcount += ret;
1372 }
1373
1374 if (indio_dev->event_interface)
1375 clk = &dev_attr_current_timestamp_clock.attr;
1376
1377 if (indio_dev->name)
1378 attrcount++;
1379 if (clk)
1380 attrcount++;
1381
1382 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1383 sizeof(indio_dev->chan_attr_group.attrs[0]),
1384 GFP_KERNEL);
1385 if (indio_dev->chan_attr_group.attrs == NULL) {
1386 ret = -ENOMEM;
1387 goto error_clear_attrs;
1388 }
1389 /* Copy across original attributes */
1390 if (indio_dev->info->attrs)
1391 memcpy(indio_dev->chan_attr_group.attrs,
1392 indio_dev->info->attrs->attrs,
1393 sizeof(indio_dev->chan_attr_group.attrs[0])
1394 *attrcount_orig);
1395 attrn = attrcount_orig;
1396 /* Add all elements from the list. */
1397 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1398 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1399 if (indio_dev->name)
1400 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1401 if (clk)
1402 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1403
1404 indio_dev->groups[indio_dev->groupcounter++] =
1405 &indio_dev->chan_attr_group;
1406
1407 return 0;
1408
1409 error_clear_attrs:
1410 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1411
1412 return ret;
1413 }
1414
1415 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1416 {
1417
1418 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1419 kfree(indio_dev->chan_attr_group.attrs);
1420 indio_dev->chan_attr_group.attrs = NULL;
1421 }
1422
1423 static void iio_dev_release(struct device *device)
1424 {
1425 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1426 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1427 iio_device_unregister_trigger_consumer(indio_dev);
1428 iio_device_unregister_eventset(indio_dev);
1429 iio_device_unregister_sysfs(indio_dev);
1430
1431 iio_buffer_put(indio_dev->buffer);
1432
1433 ida_simple_remove(&iio_ida, indio_dev->id);
1434 kfree(indio_dev);
1435 }
1436
1437 struct device_type iio_device_type = {
1438 .name = "iio_device",
1439 .release = iio_dev_release,
1440 };
1441
1442 /**
1443 * iio_device_alloc() - allocate an iio_dev from a driver
1444 * @sizeof_priv: Space to allocate for private structure.
1445 **/
1446 struct iio_dev *iio_device_alloc(int sizeof_priv)
1447 {
1448 struct iio_dev *dev;
1449 size_t alloc_size;
1450
1451 alloc_size = sizeof(struct iio_dev);
1452 if (sizeof_priv) {
1453 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1454 alloc_size += sizeof_priv;
1455 }
1456 /* ensure 32-byte alignment of whole construct ? */
1457 alloc_size += IIO_ALIGN - 1;
1458
1459 dev = kzalloc(alloc_size, GFP_KERNEL);
1460
1461 if (dev) {
1462 dev->dev.groups = dev->groups;
1463 dev->dev.type = &iio_device_type;
1464 dev->dev.bus = &iio_bus_type;
1465 device_initialize(&dev->dev);
1466 dev_set_drvdata(&dev->dev, (void *)dev);
1467 mutex_init(&dev->mlock);
1468 mutex_init(&dev->info_exist_lock);
1469 INIT_LIST_HEAD(&dev->channel_attr_list);
1470
1471 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1472 if (dev->id < 0) {
1473 /* cannot use a dev_err as the name isn't available */
1474 pr_err("failed to get device id\n");
1475 kfree(dev);
1476 return NULL;
1477 }
1478 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1479 INIT_LIST_HEAD(&dev->buffer_list);
1480 }
1481
1482 return dev;
1483 }
1484 EXPORT_SYMBOL(iio_device_alloc);
1485
1486 /**
1487 * iio_device_free() - free an iio_dev from a driver
1488 * @dev: the iio_dev associated with the device
1489 **/
1490 void iio_device_free(struct iio_dev *dev)
1491 {
1492 if (dev)
1493 put_device(&dev->dev);
1494 }
1495 EXPORT_SYMBOL(iio_device_free);
1496
1497 static void devm_iio_device_release(struct device *dev, void *res)
1498 {
1499 iio_device_free(*(struct iio_dev **)res);
1500 }
1501
1502 int devm_iio_device_match(struct device *dev, void *res, void *data)
1503 {
1504 struct iio_dev **r = res;
1505 if (!r || !*r) {
1506 WARN_ON(!r || !*r);
1507 return 0;
1508 }
1509 return *r == data;
1510 }
1511 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1512
1513 /**
1514 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1515 * @dev: Device to allocate iio_dev for
1516 * @sizeof_priv: Space to allocate for private structure.
1517 *
1518 * Managed iio_device_alloc. iio_dev allocated with this function is
1519 * automatically freed on driver detach.
1520 *
1521 * If an iio_dev allocated with this function needs to be freed separately,
1522 * devm_iio_device_free() must be used.
1523 *
1524 * RETURNS:
1525 * Pointer to allocated iio_dev on success, NULL on failure.
1526 */
1527 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1528 {
1529 struct iio_dev **ptr, *iio_dev;
1530
1531 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1532 GFP_KERNEL);
1533 if (!ptr)
1534 return NULL;
1535
1536 iio_dev = iio_device_alloc(sizeof_priv);
1537 if (iio_dev) {
1538 *ptr = iio_dev;
1539 devres_add(dev, ptr);
1540 } else {
1541 devres_free(ptr);
1542 }
1543
1544 return iio_dev;
1545 }
1546 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1547
1548 /**
1549 * devm_iio_device_free - Resource-managed iio_device_free()
1550 * @dev: Device this iio_dev belongs to
1551 * @iio_dev: the iio_dev associated with the device
1552 *
1553 * Free iio_dev allocated with devm_iio_device_alloc().
1554 */
1555 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1556 {
1557 int rc;
1558
1559 rc = devres_release(dev, devm_iio_device_release,
1560 devm_iio_device_match, iio_dev);
1561 WARN_ON(rc);
1562 }
1563 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1564
1565 /**
1566 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1567 * @inode: Inode structure for identifying the device in the file system
1568 * @filp: File structure for iio device used to keep and later access
1569 * private data
1570 *
1571 * Return: 0 on success or -EBUSY if the device is already opened
1572 **/
1573 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1574 {
1575 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1576 struct iio_dev, chrdev);
1577
1578 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1579 return -EBUSY;
1580
1581 iio_device_get(indio_dev);
1582
1583 filp->private_data = indio_dev;
1584
1585 return 0;
1586 }
1587
1588 /**
1589 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1590 * @inode: Inode structure pointer for the char device
1591 * @filp: File structure pointer for the char device
1592 *
1593 * Return: 0 for successful release
1594 */
1595 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1596 {
1597 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1598 struct iio_dev, chrdev);
1599 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1600 iio_device_put(indio_dev);
1601
1602 return 0;
1603 }
1604
1605 /* Somewhat of a cross file organization violation - ioctls here are actually
1606 * event related */
1607 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1608 {
1609 struct iio_dev *indio_dev = filp->private_data;
1610 int __user *ip = (int __user *)arg;
1611 int fd;
1612
1613 if (!indio_dev->info)
1614 return -ENODEV;
1615
1616 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1617 fd = iio_event_getfd(indio_dev);
1618 if (fd < 0)
1619 return fd;
1620 if (copy_to_user(ip, &fd, sizeof(fd)))
1621 return -EFAULT;
1622 return 0;
1623 }
1624 return -EINVAL;
1625 }
1626
1627 static const struct file_operations iio_buffer_fileops = {
1628 .read = iio_buffer_read_first_n_outer_addr,
1629 .release = iio_chrdev_release,
1630 .open = iio_chrdev_open,
1631 .poll = iio_buffer_poll_addr,
1632 .owner = THIS_MODULE,
1633 .llseek = noop_llseek,
1634 .unlocked_ioctl = iio_ioctl,
1635 .compat_ioctl = iio_ioctl,
1636 };
1637
1638 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1639 {
1640 int i, j;
1641 const struct iio_chan_spec *channels = indio_dev->channels;
1642
1643 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1644 return 0;
1645
1646 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1647 if (channels[i].scan_index < 0)
1648 continue;
1649 for (j = i + 1; j < indio_dev->num_channels; j++)
1650 if (channels[i].scan_index == channels[j].scan_index) {
1651 dev_err(&indio_dev->dev,
1652 "Duplicate scan index %d\n",
1653 channels[i].scan_index);
1654 return -EINVAL;
1655 }
1656 }
1657
1658 return 0;
1659 }
1660
1661 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1662
1663 /**
1664 * iio_device_register() - register a device with the IIO subsystem
1665 * @indio_dev: Device structure filled by the device driver
1666 **/
1667 int iio_device_register(struct iio_dev *indio_dev)
1668 {
1669 int ret;
1670
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 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1717
1718 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1719 if (ret < 0)
1720 goto error_unreg_eventset;
1721
1722 return 0;
1723
1724 error_unreg_eventset:
1725 iio_device_unregister_eventset(indio_dev);
1726 error_free_sysfs:
1727 iio_device_unregister_sysfs(indio_dev);
1728 error_buffer_free_sysfs:
1729 iio_buffer_free_sysfs_and_mask(indio_dev);
1730 error_unreg_debugfs:
1731 iio_device_unregister_debugfs(indio_dev);
1732 return ret;
1733 }
1734 EXPORT_SYMBOL(iio_device_register);
1735
1736 /**
1737 * iio_device_unregister() - unregister a device from the IIO subsystem
1738 * @indio_dev: Device structure representing the device.
1739 **/
1740 void iio_device_unregister(struct iio_dev *indio_dev)
1741 {
1742 mutex_lock(&indio_dev->info_exist_lock);
1743
1744 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1745
1746 iio_device_unregister_debugfs(indio_dev);
1747
1748 iio_disable_all_buffers(indio_dev);
1749
1750 indio_dev->info = NULL;
1751
1752 iio_device_wakeup_eventset(indio_dev);
1753 iio_buffer_wakeup_poll(indio_dev);
1754
1755 mutex_unlock(&indio_dev->info_exist_lock);
1756
1757 iio_buffer_free_sysfs_and_mask(indio_dev);
1758 }
1759 EXPORT_SYMBOL(iio_device_unregister);
1760
1761 static void devm_iio_device_unreg(struct device *dev, void *res)
1762 {
1763 iio_device_unregister(*(struct iio_dev **)res);
1764 }
1765
1766 /**
1767 * devm_iio_device_register - Resource-managed iio_device_register()
1768 * @dev: Device to allocate iio_dev for
1769 * @indio_dev: Device structure filled by the device driver
1770 *
1771 * Managed iio_device_register. The IIO device registered with this
1772 * function is automatically unregistered on driver detach. This function
1773 * calls iio_device_register() internally. Refer to that function for more
1774 * information.
1775 *
1776 * If an iio_dev registered with this function needs to be unregistered
1777 * separately, devm_iio_device_unregister() must be used.
1778 *
1779 * RETURNS:
1780 * 0 on success, negative error number on failure.
1781 */
1782 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
1783 {
1784 struct iio_dev **ptr;
1785 int ret;
1786
1787 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1788 if (!ptr)
1789 return -ENOMEM;
1790
1791 *ptr = indio_dev;
1792 ret = iio_device_register(indio_dev);
1793 if (!ret)
1794 devres_add(dev, ptr);
1795 else
1796 devres_free(ptr);
1797
1798 return ret;
1799 }
1800 EXPORT_SYMBOL_GPL(devm_iio_device_register);
1801
1802 /**
1803 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1804 * @dev: Device this iio_dev belongs to
1805 * @indio_dev: the iio_dev associated with the device
1806 *
1807 * Unregister iio_dev registered with devm_iio_device_register().
1808 */
1809 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1810 {
1811 int rc;
1812
1813 rc = devres_release(dev, devm_iio_device_unreg,
1814 devm_iio_device_match, indio_dev);
1815 WARN_ON(rc);
1816 }
1817 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1818
1819 /**
1820 * iio_device_claim_direct_mode - Keep device in direct mode
1821 * @indio_dev: the iio_dev associated with the device
1822 *
1823 * If the device is in direct mode it is guaranteed to stay
1824 * that way until iio_device_release_direct_mode() is called.
1825 *
1826 * Use with iio_device_release_direct_mode()
1827 *
1828 * Returns: 0 on success, -EBUSY on failure
1829 */
1830 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1831 {
1832 mutex_lock(&indio_dev->mlock);
1833
1834 if (iio_buffer_enabled(indio_dev)) {
1835 mutex_unlock(&indio_dev->mlock);
1836 return -EBUSY;
1837 }
1838 return 0;
1839 }
1840 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1841
1842 /**
1843 * iio_device_release_direct_mode - releases claim on direct mode
1844 * @indio_dev: the iio_dev associated with the device
1845 *
1846 * Release the claim. Device is no longer guaranteed to stay
1847 * in direct mode.
1848 *
1849 * Use with iio_device_claim_direct_mode()
1850 */
1851 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1852 {
1853 mutex_unlock(&indio_dev->mlock);
1854 }
1855 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1856
1857 subsys_initcall(iio_init);
1858 module_exit(iio_exit);
1859
1860 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1861 MODULE_DESCRIPTION("Industrial I/O core");
1862 MODULE_LICENSE("GPL");
Linux with added FPC-III support