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Merge tag 'iio-for-4.13a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[thirdparty/kernel/stable.git] / drivers / iio / industrialio-core.c
1 /* The industrial I/O core
2 *
3 * Copyright (c) 2008 Jonathan Cameron
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * Based on elements of hwmon and input subsystems.
10 */
11
12 #define pr_fmt(fmt) "iio-core: " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/idr.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/fs.h>
21 #include <linux/poll.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/cdev.h>
25 #include <linux/slab.h>
26 #include <linux/anon_inodes.h>
27 #include <linux/debugfs.h>
28 #include <linux/mutex.h>
29 #include <linux/iio/iio.h>
30 #include "iio_core.h"
31 #include "iio_core_trigger.h"
32 #include <linux/iio/sysfs.h>
33 #include <linux/iio/events.h>
34 #include <linux/iio/buffer.h>
35 #include <linux/iio/buffer_impl.h>
36
37 /* IDA to assign each registered device a unique id */
38 static DEFINE_IDA(iio_ida);
39
40 static dev_t iio_devt;
41
42 #define IIO_DEV_MAX 256
43 struct bus_type iio_bus_type = {
44 .name = "iio",
45 };
46 EXPORT_SYMBOL(iio_bus_type);
47
48 static struct dentry *iio_debugfs_dentry;
49
50 static const char * const iio_direction[] = {
51 [0] = "in",
52 [1] = "out",
53 };
54
55 static const char * const iio_chan_type_name_spec[] = {
56 [IIO_VOLTAGE] = "voltage",
57 [IIO_CURRENT] = "current",
58 [IIO_POWER] = "power",
59 [IIO_ACCEL] = "accel",
60 [IIO_ANGL_VEL] = "anglvel",
61 [IIO_MAGN] = "magn",
62 [IIO_LIGHT] = "illuminance",
63 [IIO_INTENSITY] = "intensity",
64 [IIO_PROXIMITY] = "proximity",
65 [IIO_TEMP] = "temp",
66 [IIO_INCLI] = "incli",
67 [IIO_ROT] = "rot",
68 [IIO_ANGL] = "angl",
69 [IIO_TIMESTAMP] = "timestamp",
70 [IIO_CAPACITANCE] = "capacitance",
71 [IIO_ALTVOLTAGE] = "altvoltage",
72 [IIO_CCT] = "cct",
73 [IIO_PRESSURE] = "pressure",
74 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
75 [IIO_ACTIVITY] = "activity",
76 [IIO_STEPS] = "steps",
77 [IIO_ENERGY] = "energy",
78 [IIO_DISTANCE] = "distance",
79 [IIO_VELOCITY] = "velocity",
80 [IIO_CONCENTRATION] = "concentration",
81 [IIO_RESISTANCE] = "resistance",
82 [IIO_PH] = "ph",
83 [IIO_UVINDEX] = "uvindex",
84 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
85 [IIO_COUNT] = "count",
86 [IIO_INDEX] = "index",
87 [IIO_GRAVITY] = "gravity",
88 };
89
90 static const char * const iio_modifier_names[] = {
91 [IIO_MOD_X] = "x",
92 [IIO_MOD_Y] = "y",
93 [IIO_MOD_Z] = "z",
94 [IIO_MOD_X_AND_Y] = "x&y",
95 [IIO_MOD_X_AND_Z] = "x&z",
96 [IIO_MOD_Y_AND_Z] = "y&z",
97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
98 [IIO_MOD_X_OR_Y] = "x|y",
99 [IIO_MOD_X_OR_Z] = "x|z",
100 [IIO_MOD_Y_OR_Z] = "y|z",
101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
102 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
103 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
104 [IIO_MOD_LIGHT_BOTH] = "both",
105 [IIO_MOD_LIGHT_IR] = "ir",
106 [IIO_MOD_LIGHT_CLEAR] = "clear",
107 [IIO_MOD_LIGHT_RED] = "red",
108 [IIO_MOD_LIGHT_GREEN] = "green",
109 [IIO_MOD_LIGHT_BLUE] = "blue",
110 [IIO_MOD_LIGHT_UV] = "uv",
111 [IIO_MOD_QUATERNION] = "quaternion",
112 [IIO_MOD_TEMP_AMBIENT] = "ambient",
113 [IIO_MOD_TEMP_OBJECT] = "object",
114 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
115 [IIO_MOD_NORTH_TRUE] = "from_north_true",
116 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
117 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
118 [IIO_MOD_RUNNING] = "running",
119 [IIO_MOD_JOGGING] = "jogging",
120 [IIO_MOD_WALKING] = "walking",
121 [IIO_MOD_STILL] = "still",
122 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
123 [IIO_MOD_I] = "i",
124 [IIO_MOD_Q] = "q",
125 [IIO_MOD_CO2] = "co2",
126 [IIO_MOD_VOC] = "voc",
127 };
128
129 /* relies on pairs of these shared then separate */
130 static const char * const iio_chan_info_postfix[] = {
131 [IIO_CHAN_INFO_RAW] = "raw",
132 [IIO_CHAN_INFO_PROCESSED] = "input",
133 [IIO_CHAN_INFO_SCALE] = "scale",
134 [IIO_CHAN_INFO_OFFSET] = "offset",
135 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
136 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
137 [IIO_CHAN_INFO_PEAK] = "peak_raw",
138 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
139 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
140 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
141 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
142 = "filter_low_pass_3db_frequency",
143 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
144 = "filter_high_pass_3db_frequency",
145 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
146 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
147 [IIO_CHAN_INFO_PHASE] = "phase",
148 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
149 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
150 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
151 [IIO_CHAN_INFO_ENABLE] = "en",
152 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
153 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
154 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
155 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
156 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
157 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
158 };
159
160 /**
161 * iio_find_channel_from_si() - get channel from its scan index
162 * @indio_dev: device
163 * @si: scan index to match
164 */
165 const struct iio_chan_spec
166 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
167 {
168 int i;
169
170 for (i = 0; i < indio_dev->num_channels; i++)
171 if (indio_dev->channels[i].scan_index == si)
172 return &indio_dev->channels[i];
173 return NULL;
174 }
175
176 /* This turns up an awful lot */
177 ssize_t iio_read_const_attr(struct device *dev,
178 struct device_attribute *attr,
179 char *buf)
180 {
181 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
182 }
183 EXPORT_SYMBOL(iio_read_const_attr);
184
185 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
186 {
187 int ret;
188 const struct iio_event_interface *ev_int = indio_dev->event_interface;
189
190 ret = mutex_lock_interruptible(&indio_dev->mlock);
191 if (ret)
192 return ret;
193 if ((ev_int && iio_event_enabled(ev_int)) ||
194 iio_buffer_enabled(indio_dev)) {
195 mutex_unlock(&indio_dev->mlock);
196 return -EBUSY;
197 }
198 indio_dev->clock_id = clock_id;
199 mutex_unlock(&indio_dev->mlock);
200
201 return 0;
202 }
203
204 /**
205 * iio_get_time_ns() - utility function to get a time stamp for events etc
206 * @indio_dev: device
207 */
208 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
209 {
210 struct timespec tp;
211
212 switch (iio_device_get_clock(indio_dev)) {
213 case CLOCK_REALTIME:
214 ktime_get_real_ts(&tp);
215 break;
216 case CLOCK_MONOTONIC:
217 ktime_get_ts(&tp);
218 break;
219 case CLOCK_MONOTONIC_RAW:
220 getrawmonotonic(&tp);
221 break;
222 case CLOCK_REALTIME_COARSE:
223 tp = current_kernel_time();
224 break;
225 case CLOCK_MONOTONIC_COARSE:
226 tp = get_monotonic_coarse();
227 break;
228 case CLOCK_BOOTTIME:
229 get_monotonic_boottime(&tp);
230 break;
231 case CLOCK_TAI:
232 timekeeping_clocktai(&tp);
233 break;
234 default:
235 BUG();
236 }
237
238 return timespec_to_ns(&tp);
239 }
240 EXPORT_SYMBOL(iio_get_time_ns);
241
242 /**
243 * iio_get_time_res() - utility function to get time stamp clock resolution in
244 * nano seconds.
245 * @indio_dev: device
246 */
247 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
248 {
249 switch (iio_device_get_clock(indio_dev)) {
250 case CLOCK_REALTIME:
251 case CLOCK_MONOTONIC:
252 case CLOCK_MONOTONIC_RAW:
253 case CLOCK_BOOTTIME:
254 case CLOCK_TAI:
255 return hrtimer_resolution;
256 case CLOCK_REALTIME_COARSE:
257 case CLOCK_MONOTONIC_COARSE:
258 return LOW_RES_NSEC;
259 default:
260 BUG();
261 }
262 }
263 EXPORT_SYMBOL(iio_get_time_res);
264
265 static int __init iio_init(void)
266 {
267 int ret;
268
269 /* Register sysfs bus */
270 ret = bus_register(&iio_bus_type);
271 if (ret < 0) {
272 pr_err("could not register bus type\n");
273 goto error_nothing;
274 }
275
276 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
277 if (ret < 0) {
278 pr_err("failed to allocate char dev region\n");
279 goto error_unregister_bus_type;
280 }
281
282 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
283
284 return 0;
285
286 error_unregister_bus_type:
287 bus_unregister(&iio_bus_type);
288 error_nothing:
289 return ret;
290 }
291
292 static void __exit iio_exit(void)
293 {
294 if (iio_devt)
295 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
296 bus_unregister(&iio_bus_type);
297 debugfs_remove(iio_debugfs_dentry);
298 }
299
300 #if defined(CONFIG_DEBUG_FS)
301 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
302 size_t count, loff_t *ppos)
303 {
304 struct iio_dev *indio_dev = file->private_data;
305 char buf[20];
306 unsigned val = 0;
307 ssize_t len;
308 int ret;
309
310 ret = indio_dev->info->debugfs_reg_access(indio_dev,
311 indio_dev->cached_reg_addr,
312 0, &val);
313 if (ret)
314 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
315
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 unsigned int i;
482 int ret;
483
484 if (!e->set)
485 return -EINVAL;
486
487 for (i = 0; i < e->num_items; i++) {
488 if (sysfs_streq(buf, e->items[i]))
489 break;
490 }
491
492 if (i == e->num_items)
493 return -EINVAL;
494
495 ret = e->set(indio_dev, chan, i);
496 return ret ? ret : len;
497 }
498 EXPORT_SYMBOL_GPL(iio_enum_write);
499
500 static const struct iio_mount_matrix iio_mount_idmatrix = {
501 .rotation = {
502 "1", "0", "0",
503 "0", "1", "0",
504 "0", "0", "1"
505 }
506 };
507
508 static int iio_setup_mount_idmatrix(const struct device *dev,
509 struct iio_mount_matrix *matrix)
510 {
511 *matrix = iio_mount_idmatrix;
512 dev_info(dev, "mounting matrix not found: using identity...\n");
513 return 0;
514 }
515
516 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
517 const struct iio_chan_spec *chan, char *buf)
518 {
519 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
520 priv)(indio_dev, chan);
521
522 if (IS_ERR(mtx))
523 return PTR_ERR(mtx);
524
525 if (!mtx)
526 mtx = &iio_mount_idmatrix;
527
528 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
529 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
530 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
531 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
532 }
533 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
534
535 /**
536 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
537 * device-tree "mount-matrix" property
538 * @dev: device the mounting matrix property is assigned to
539 * @propname: device specific mounting matrix property name
540 * @matrix: where to store retrieved matrix
541 *
542 * If device is assigned no mounting matrix property, a default 3x3 identity
543 * matrix will be filled in.
544 *
545 * Return: 0 if success, or a negative error code on failure.
546 */
547 #ifdef CONFIG_OF
548 int of_iio_read_mount_matrix(const struct device *dev,
549 const char *propname,
550 struct iio_mount_matrix *matrix)
551 {
552 if (dev->of_node) {
553 int err = of_property_read_string_array(dev->of_node,
554 propname, matrix->rotation,
555 ARRAY_SIZE(iio_mount_idmatrix.rotation));
556
557 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
558 return 0;
559
560 if (err >= 0)
561 /* Invalid number of matrix entries. */
562 return -EINVAL;
563
564 if (err != -EINVAL)
565 /* Invalid matrix declaration format. */
566 return err;
567 }
568
569 /* Matrix was not declared at all: fallback to identity. */
570 return iio_setup_mount_idmatrix(dev, matrix);
571 }
572 #else
573 int of_iio_read_mount_matrix(const struct device *dev,
574 const char *propname,
575 struct iio_mount_matrix *matrix)
576 {
577 return iio_setup_mount_idmatrix(dev, matrix);
578 }
579 #endif
580 EXPORT_SYMBOL(of_iio_read_mount_matrix);
581
582 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
583 int size, const int *vals)
584 {
585 unsigned long long tmp;
586 int tmp0, tmp1;
587 bool scale_db = false;
588
589 switch (type) {
590 case IIO_VAL_INT:
591 return snprintf(buf, len, "%d", vals[0]);
592 case IIO_VAL_INT_PLUS_MICRO_DB:
593 scale_db = true;
594 case IIO_VAL_INT_PLUS_MICRO:
595 if (vals[1] < 0)
596 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
597 -vals[1], scale_db ? " dB" : "");
598 else
599 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
600 scale_db ? " dB" : "");
601 case IIO_VAL_INT_PLUS_NANO:
602 if (vals[1] < 0)
603 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
604 -vals[1]);
605 else
606 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
607 case IIO_VAL_FRACTIONAL:
608 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
609 tmp1 = vals[1];
610 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
611 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
612 case IIO_VAL_FRACTIONAL_LOG2:
613 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
614 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
615 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
616 case IIO_VAL_INT_MULTIPLE:
617 {
618 int i;
619 int l = 0;
620
621 for (i = 0; i < size; ++i) {
622 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
623 if (l >= len)
624 break;
625 }
626 return l;
627 }
628 default:
629 return 0;
630 }
631 }
632
633 /**
634 * iio_format_value() - Formats a IIO value into its string representation
635 * @buf: The buffer to which the formatted value gets written
636 * which is assumed to be big enough (i.e. PAGE_SIZE).
637 * @type: One of the IIO_VAL_... constants. This decides how the val
638 * and val2 parameters are formatted.
639 * @size: Number of IIO value entries contained in vals
640 * @vals: Pointer to the values, exact meaning depends on the
641 * type parameter.
642 *
643 * Return: 0 by default, a negative number on failure or the
644 * total number of characters written for a type that belongs
645 * to the IIO_VAL_... constant.
646 */
647 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
648 {
649 ssize_t len;
650
651 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
652 if (len >= PAGE_SIZE - 1)
653 return -EFBIG;
654
655 return len + sprintf(buf + len, "\n");
656 }
657 EXPORT_SYMBOL_GPL(iio_format_value);
658
659 static ssize_t iio_read_channel_info(struct device *dev,
660 struct device_attribute *attr,
661 char *buf)
662 {
663 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
664 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
665 int vals[INDIO_MAX_RAW_ELEMENTS];
666 int ret;
667 int val_len = 2;
668
669 if (indio_dev->info->read_raw_multi)
670 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
671 INDIO_MAX_RAW_ELEMENTS,
672 vals, &val_len,
673 this_attr->address);
674 else
675 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
676 &vals[0], &vals[1], this_attr->address);
677
678 if (ret < 0)
679 return ret;
680
681 return iio_format_value(buf, ret, val_len, vals);
682 }
683
684 static ssize_t iio_format_avail_list(char *buf, const int *vals,
685 int type, int length)
686 {
687 int i;
688 ssize_t len = 0;
689
690 switch (type) {
691 case IIO_VAL_INT:
692 for (i = 0; i < length; i++) {
693 len += __iio_format_value(buf + len, PAGE_SIZE - len,
694 type, 1, &vals[i]);
695 if (len >= PAGE_SIZE)
696 return -EFBIG;
697 if (i < length - 1)
698 len += snprintf(buf + len, PAGE_SIZE - len,
699 " ");
700 else
701 len += snprintf(buf + len, PAGE_SIZE - len,
702 "\n");
703 if (len >= PAGE_SIZE)
704 return -EFBIG;
705 }
706 break;
707 default:
708 for (i = 0; i < length / 2; i++) {
709 len += __iio_format_value(buf + len, PAGE_SIZE - len,
710 type, 2, &vals[i * 2]);
711 if (len >= PAGE_SIZE)
712 return -EFBIG;
713 if (i < length / 2 - 1)
714 len += snprintf(buf + len, PAGE_SIZE - len,
715 " ");
716 else
717 len += snprintf(buf + len, PAGE_SIZE - len,
718 "\n");
719 if (len >= PAGE_SIZE)
720 return -EFBIG;
721 }
722 }
723
724 return len;
725 }
726
727 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
728 {
729 int i;
730 ssize_t len;
731
732 len = snprintf(buf, PAGE_SIZE, "[");
733 switch (type) {
734 case IIO_VAL_INT:
735 for (i = 0; i < 3; i++) {
736 len += __iio_format_value(buf + len, PAGE_SIZE - len,
737 type, 1, &vals[i]);
738 if (len >= PAGE_SIZE)
739 return -EFBIG;
740 if (i < 2)
741 len += snprintf(buf + len, PAGE_SIZE - len,
742 " ");
743 else
744 len += snprintf(buf + len, PAGE_SIZE - len,
745 "]\n");
746 if (len >= PAGE_SIZE)
747 return -EFBIG;
748 }
749 break;
750 default:
751 for (i = 0; i < 3; i++) {
752 len += __iio_format_value(buf + len, PAGE_SIZE - len,
753 type, 2, &vals[i * 2]);
754 if (len >= PAGE_SIZE)
755 return -EFBIG;
756 if (i < 2)
757 len += snprintf(buf + len, PAGE_SIZE - len,
758 " ");
759 else
760 len += snprintf(buf + len, PAGE_SIZE - len,
761 "]\n");
762 if (len >= PAGE_SIZE)
763 return -EFBIG;
764 }
765 }
766
767 return len;
768 }
769
770 static ssize_t iio_read_channel_info_avail(struct device *dev,
771 struct device_attribute *attr,
772 char *buf)
773 {
774 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
775 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
776 const int *vals;
777 int ret;
778 int length;
779 int type;
780
781 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
782 &vals, &type, &length,
783 this_attr->address);
784
785 if (ret < 0)
786 return ret;
787 switch (ret) {
788 case IIO_AVAIL_LIST:
789 return iio_format_avail_list(buf, vals, type, length);
790 case IIO_AVAIL_RANGE:
791 return iio_format_avail_range(buf, vals, type);
792 default:
793 return -EINVAL;
794 }
795 }
796
797 /**
798 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
799 * @str: The string to parse
800 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
801 * @integer: The integer part of the number
802 * @fract: The fractional part of the number
803 *
804 * Returns 0 on success, or a negative error code if the string could not be
805 * parsed.
806 */
807 int iio_str_to_fixpoint(const char *str, int fract_mult,
808 int *integer, int *fract)
809 {
810 int i = 0, f = 0;
811 bool integer_part = true, negative = false;
812
813 if (fract_mult == 0) {
814 *fract = 0;
815
816 return kstrtoint(str, 0, integer);
817 }
818
819 if (str[0] == '-') {
820 negative = true;
821 str++;
822 } else if (str[0] == '+') {
823 str++;
824 }
825
826 while (*str) {
827 if ('0' <= *str && *str <= '9') {
828 if (integer_part) {
829 i = i * 10 + *str - '0';
830 } else {
831 f += fract_mult * (*str - '0');
832 fract_mult /= 10;
833 }
834 } else if (*str == '\n') {
835 if (*(str + 1) == '\0')
836 break;
837 else
838 return -EINVAL;
839 } else if (*str == '.' && integer_part) {
840 integer_part = false;
841 } else {
842 return -EINVAL;
843 }
844 str++;
845 }
846
847 if (negative) {
848 if (i)
849 i = -i;
850 else
851 f = -f;
852 }
853
854 *integer = i;
855 *fract = f;
856
857 return 0;
858 }
859 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
860
861 static ssize_t iio_write_channel_info(struct device *dev,
862 struct device_attribute *attr,
863 const char *buf,
864 size_t len)
865 {
866 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
867 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
868 int ret, fract_mult = 100000;
869 int integer, fract;
870
871 /* Assumes decimal - precision based on number of digits */
872 if (!indio_dev->info->write_raw)
873 return -EINVAL;
874
875 if (indio_dev->info->write_raw_get_fmt)
876 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
877 this_attr->c, this_attr->address)) {
878 case IIO_VAL_INT:
879 fract_mult = 0;
880 break;
881 case IIO_VAL_INT_PLUS_MICRO:
882 fract_mult = 100000;
883 break;
884 case IIO_VAL_INT_PLUS_NANO:
885 fract_mult = 100000000;
886 break;
887 default:
888 return -EINVAL;
889 }
890
891 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
892 if (ret)
893 return ret;
894
895 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
896 integer, fract, this_attr->address);
897 if (ret)
898 return ret;
899
900 return len;
901 }
902
903 static
904 int __iio_device_attr_init(struct device_attribute *dev_attr,
905 const char *postfix,
906 struct iio_chan_spec const *chan,
907 ssize_t (*readfunc)(struct device *dev,
908 struct device_attribute *attr,
909 char *buf),
910 ssize_t (*writefunc)(struct device *dev,
911 struct device_attribute *attr,
912 const char *buf,
913 size_t len),
914 enum iio_shared_by shared_by)
915 {
916 int ret = 0;
917 char *name = NULL;
918 char *full_postfix;
919 sysfs_attr_init(&dev_attr->attr);
920
921 /* Build up postfix of <extend_name>_<modifier>_postfix */
922 if (chan->modified && (shared_by == IIO_SEPARATE)) {
923 if (chan->extend_name)
924 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
925 iio_modifier_names[chan
926 ->channel2],
927 chan->extend_name,
928 postfix);
929 else
930 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
931 iio_modifier_names[chan
932 ->channel2],
933 postfix);
934 } else {
935 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
936 full_postfix = kstrdup(postfix, GFP_KERNEL);
937 else
938 full_postfix = kasprintf(GFP_KERNEL,
939 "%s_%s",
940 chan->extend_name,
941 postfix);
942 }
943 if (full_postfix == NULL)
944 return -ENOMEM;
945
946 if (chan->differential) { /* Differential can not have modifier */
947 switch (shared_by) {
948 case IIO_SHARED_BY_ALL:
949 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
950 break;
951 case IIO_SHARED_BY_DIR:
952 name = kasprintf(GFP_KERNEL, "%s_%s",
953 iio_direction[chan->output],
954 full_postfix);
955 break;
956 case IIO_SHARED_BY_TYPE:
957 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
958 iio_direction[chan->output],
959 iio_chan_type_name_spec[chan->type],
960 iio_chan_type_name_spec[chan->type],
961 full_postfix);
962 break;
963 case IIO_SEPARATE:
964 if (!chan->indexed) {
965 WARN(1, "Differential channels must be indexed\n");
966 ret = -EINVAL;
967 goto error_free_full_postfix;
968 }
969 name = kasprintf(GFP_KERNEL,
970 "%s_%s%d-%s%d_%s",
971 iio_direction[chan->output],
972 iio_chan_type_name_spec[chan->type],
973 chan->channel,
974 iio_chan_type_name_spec[chan->type],
975 chan->channel2,
976 full_postfix);
977 break;
978 }
979 } else { /* Single ended */
980 switch (shared_by) {
981 case IIO_SHARED_BY_ALL:
982 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
983 break;
984 case IIO_SHARED_BY_DIR:
985 name = kasprintf(GFP_KERNEL, "%s_%s",
986 iio_direction[chan->output],
987 full_postfix);
988 break;
989 case IIO_SHARED_BY_TYPE:
990 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
991 iio_direction[chan->output],
992 iio_chan_type_name_spec[chan->type],
993 full_postfix);
994 break;
995
996 case IIO_SEPARATE:
997 if (chan->indexed)
998 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
999 iio_direction[chan->output],
1000 iio_chan_type_name_spec[chan->type],
1001 chan->channel,
1002 full_postfix);
1003 else
1004 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1005 iio_direction[chan->output],
1006 iio_chan_type_name_spec[chan->type],
1007 full_postfix);
1008 break;
1009 }
1010 }
1011 if (name == NULL) {
1012 ret = -ENOMEM;
1013 goto error_free_full_postfix;
1014 }
1015 dev_attr->attr.name = name;
1016
1017 if (readfunc) {
1018 dev_attr->attr.mode |= S_IRUGO;
1019 dev_attr->show = readfunc;
1020 }
1021
1022 if (writefunc) {
1023 dev_attr->attr.mode |= S_IWUSR;
1024 dev_attr->store = writefunc;
1025 }
1026
1027 error_free_full_postfix:
1028 kfree(full_postfix);
1029
1030 return ret;
1031 }
1032
1033 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1034 {
1035 kfree(dev_attr->attr.name);
1036 }
1037
1038 int __iio_add_chan_devattr(const char *postfix,
1039 struct iio_chan_spec const *chan,
1040 ssize_t (*readfunc)(struct device *dev,
1041 struct device_attribute *attr,
1042 char *buf),
1043 ssize_t (*writefunc)(struct device *dev,
1044 struct device_attribute *attr,
1045 const char *buf,
1046 size_t len),
1047 u64 mask,
1048 enum iio_shared_by shared_by,
1049 struct device *dev,
1050 struct list_head *attr_list)
1051 {
1052 int ret;
1053 struct iio_dev_attr *iio_attr, *t;
1054
1055 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1056 if (iio_attr == NULL)
1057 return -ENOMEM;
1058 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1059 postfix, chan,
1060 readfunc, writefunc, shared_by);
1061 if (ret)
1062 goto error_iio_dev_attr_free;
1063 iio_attr->c = chan;
1064 iio_attr->address = mask;
1065 list_for_each_entry(t, attr_list, l)
1066 if (strcmp(t->dev_attr.attr.name,
1067 iio_attr->dev_attr.attr.name) == 0) {
1068 if (shared_by == IIO_SEPARATE)
1069 dev_err(dev, "tried to double register : %s\n",
1070 t->dev_attr.attr.name);
1071 ret = -EBUSY;
1072 goto error_device_attr_deinit;
1073 }
1074 list_add(&iio_attr->l, attr_list);
1075
1076 return 0;
1077
1078 error_device_attr_deinit:
1079 __iio_device_attr_deinit(&iio_attr->dev_attr);
1080 error_iio_dev_attr_free:
1081 kfree(iio_attr);
1082 return ret;
1083 }
1084
1085 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1086 struct iio_chan_spec const *chan,
1087 enum iio_shared_by shared_by,
1088 const long *infomask)
1089 {
1090 int i, ret, attrcount = 0;
1091
1092 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1093 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1094 return -EINVAL;
1095 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1096 chan,
1097 &iio_read_channel_info,
1098 &iio_write_channel_info,
1099 i,
1100 shared_by,
1101 &indio_dev->dev,
1102 &indio_dev->channel_attr_list);
1103 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1104 continue;
1105 else if (ret < 0)
1106 return ret;
1107 attrcount++;
1108 }
1109
1110 return attrcount;
1111 }
1112
1113 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1114 struct iio_chan_spec const *chan,
1115 enum iio_shared_by shared_by,
1116 const long *infomask)
1117 {
1118 int i, ret, attrcount = 0;
1119 char *avail_postfix;
1120
1121 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1122 avail_postfix = kasprintf(GFP_KERNEL,
1123 "%s_available",
1124 iio_chan_info_postfix[i]);
1125 if (!avail_postfix)
1126 return -ENOMEM;
1127
1128 ret = __iio_add_chan_devattr(avail_postfix,
1129 chan,
1130 &iio_read_channel_info_avail,
1131 NULL,
1132 i,
1133 shared_by,
1134 &indio_dev->dev,
1135 &indio_dev->channel_attr_list);
1136 kfree(avail_postfix);
1137 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1138 continue;
1139 else if (ret < 0)
1140 return ret;
1141 attrcount++;
1142 }
1143
1144 return attrcount;
1145 }
1146
1147 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1148 struct iio_chan_spec const *chan)
1149 {
1150 int ret, attrcount = 0;
1151 const struct iio_chan_spec_ext_info *ext_info;
1152
1153 if (chan->channel < 0)
1154 return 0;
1155 ret = iio_device_add_info_mask_type(indio_dev, chan,
1156 IIO_SEPARATE,
1157 &chan->info_mask_separate);
1158 if (ret < 0)
1159 return ret;
1160 attrcount += ret;
1161
1162 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1163 IIO_SEPARATE,
1164 &chan->
1165 info_mask_separate_available);
1166 if (ret < 0)
1167 return ret;
1168 attrcount += ret;
1169
1170 ret = iio_device_add_info_mask_type(indio_dev, chan,
1171 IIO_SHARED_BY_TYPE,
1172 &chan->info_mask_shared_by_type);
1173 if (ret < 0)
1174 return ret;
1175 attrcount += ret;
1176
1177 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1178 IIO_SHARED_BY_TYPE,
1179 &chan->
1180 info_mask_shared_by_type_available);
1181 if (ret < 0)
1182 return ret;
1183 attrcount += ret;
1184
1185 ret = iio_device_add_info_mask_type(indio_dev, chan,
1186 IIO_SHARED_BY_DIR,
1187 &chan->info_mask_shared_by_dir);
1188 if (ret < 0)
1189 return ret;
1190 attrcount += ret;
1191
1192 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1193 IIO_SHARED_BY_DIR,
1194 &chan->info_mask_shared_by_dir_available);
1195 if (ret < 0)
1196 return ret;
1197 attrcount += ret;
1198
1199 ret = iio_device_add_info_mask_type(indio_dev, chan,
1200 IIO_SHARED_BY_ALL,
1201 &chan->info_mask_shared_by_all);
1202 if (ret < 0)
1203 return ret;
1204 attrcount += ret;
1205
1206 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1207 IIO_SHARED_BY_ALL,
1208 &chan->info_mask_shared_by_all_available);
1209 if (ret < 0)
1210 return ret;
1211 attrcount += ret;
1212
1213 if (chan->ext_info) {
1214 unsigned int i = 0;
1215 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1216 ret = __iio_add_chan_devattr(ext_info->name,
1217 chan,
1218 ext_info->read ?
1219 &iio_read_channel_ext_info : NULL,
1220 ext_info->write ?
1221 &iio_write_channel_ext_info : NULL,
1222 i,
1223 ext_info->shared,
1224 &indio_dev->dev,
1225 &indio_dev->channel_attr_list);
1226 i++;
1227 if (ret == -EBUSY && ext_info->shared)
1228 continue;
1229
1230 if (ret)
1231 return ret;
1232
1233 attrcount++;
1234 }
1235 }
1236
1237 return attrcount;
1238 }
1239
1240 /**
1241 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1242 * @attr_list: List of IIO device attributes
1243 *
1244 * This function frees the memory allocated for each of the IIO device
1245 * attributes in the list.
1246 */
1247 void iio_free_chan_devattr_list(struct list_head *attr_list)
1248 {
1249 struct iio_dev_attr *p, *n;
1250
1251 list_for_each_entry_safe(p, n, attr_list, l) {
1252 kfree(p->dev_attr.attr.name);
1253 list_del(&p->l);
1254 kfree(p);
1255 }
1256 }
1257
1258 static ssize_t iio_show_dev_name(struct device *dev,
1259 struct device_attribute *attr,
1260 char *buf)
1261 {
1262 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1263 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1264 }
1265
1266 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1267
1268 static ssize_t iio_show_timestamp_clock(struct device *dev,
1269 struct device_attribute *attr,
1270 char *buf)
1271 {
1272 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1273 const clockid_t clk = iio_device_get_clock(indio_dev);
1274 const char *name;
1275 ssize_t sz;
1276
1277 switch (clk) {
1278 case CLOCK_REALTIME:
1279 name = "realtime\n";
1280 sz = sizeof("realtime\n");
1281 break;
1282 case CLOCK_MONOTONIC:
1283 name = "monotonic\n";
1284 sz = sizeof("monotonic\n");
1285 break;
1286 case CLOCK_MONOTONIC_RAW:
1287 name = "monotonic_raw\n";
1288 sz = sizeof("monotonic_raw\n");
1289 break;
1290 case CLOCK_REALTIME_COARSE:
1291 name = "realtime_coarse\n";
1292 sz = sizeof("realtime_coarse\n");
1293 break;
1294 case CLOCK_MONOTONIC_COARSE:
1295 name = "monotonic_coarse\n";
1296 sz = sizeof("monotonic_coarse\n");
1297 break;
1298 case CLOCK_BOOTTIME:
1299 name = "boottime\n";
1300 sz = sizeof("boottime\n");
1301 break;
1302 case CLOCK_TAI:
1303 name = "tai\n";
1304 sz = sizeof("tai\n");
1305 break;
1306 default:
1307 BUG();
1308 }
1309
1310 memcpy(buf, name, sz);
1311 return sz;
1312 }
1313
1314 static ssize_t iio_store_timestamp_clock(struct device *dev,
1315 struct device_attribute *attr,
1316 const char *buf, size_t len)
1317 {
1318 clockid_t clk;
1319 int ret;
1320
1321 if (sysfs_streq(buf, "realtime"))
1322 clk = CLOCK_REALTIME;
1323 else if (sysfs_streq(buf, "monotonic"))
1324 clk = CLOCK_MONOTONIC;
1325 else if (sysfs_streq(buf, "monotonic_raw"))
1326 clk = CLOCK_MONOTONIC_RAW;
1327 else if (sysfs_streq(buf, "realtime_coarse"))
1328 clk = CLOCK_REALTIME_COARSE;
1329 else if (sysfs_streq(buf, "monotonic_coarse"))
1330 clk = CLOCK_MONOTONIC_COARSE;
1331 else if (sysfs_streq(buf, "boottime"))
1332 clk = CLOCK_BOOTTIME;
1333 else if (sysfs_streq(buf, "tai"))
1334 clk = CLOCK_TAI;
1335 else
1336 return -EINVAL;
1337
1338 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1339 if (ret)
1340 return ret;
1341
1342 return len;
1343 }
1344
1345 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1346 iio_show_timestamp_clock, iio_store_timestamp_clock);
1347
1348 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1349 {
1350 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1351 struct iio_dev_attr *p;
1352 struct attribute **attr, *clk = NULL;
1353
1354 /* First count elements in any existing group */
1355 if (indio_dev->info->attrs) {
1356 attr = indio_dev->info->attrs->attrs;
1357 while (*attr++ != NULL)
1358 attrcount_orig++;
1359 }
1360 attrcount = attrcount_orig;
1361 /*
1362 * New channel registration method - relies on the fact a group does
1363 * not need to be initialized if its name is NULL.
1364 */
1365 if (indio_dev->channels)
1366 for (i = 0; i < indio_dev->num_channels; i++) {
1367 const struct iio_chan_spec *chan =
1368 &indio_dev->channels[i];
1369
1370 if (chan->type == IIO_TIMESTAMP)
1371 clk = &dev_attr_current_timestamp_clock.attr;
1372
1373 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1374 if (ret < 0)
1375 goto error_clear_attrs;
1376 attrcount += ret;
1377 }
1378
1379 if (indio_dev->event_interface)
1380 clk = &dev_attr_current_timestamp_clock.attr;
1381
1382 if (indio_dev->name)
1383 attrcount++;
1384 if (clk)
1385 attrcount++;
1386
1387 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1388 sizeof(indio_dev->chan_attr_group.attrs[0]),
1389 GFP_KERNEL);
1390 if (indio_dev->chan_attr_group.attrs == NULL) {
1391 ret = -ENOMEM;
1392 goto error_clear_attrs;
1393 }
1394 /* Copy across original attributes */
1395 if (indio_dev->info->attrs)
1396 memcpy(indio_dev->chan_attr_group.attrs,
1397 indio_dev->info->attrs->attrs,
1398 sizeof(indio_dev->chan_attr_group.attrs[0])
1399 *attrcount_orig);
1400 attrn = attrcount_orig;
1401 /* Add all elements from the list. */
1402 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1403 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1404 if (indio_dev->name)
1405 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1406 if (clk)
1407 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1408
1409 indio_dev->groups[indio_dev->groupcounter++] =
1410 &indio_dev->chan_attr_group;
1411
1412 return 0;
1413
1414 error_clear_attrs:
1415 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1416
1417 return ret;
1418 }
1419
1420 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1421 {
1422
1423 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1424 kfree(indio_dev->chan_attr_group.attrs);
1425 indio_dev->chan_attr_group.attrs = NULL;
1426 }
1427
1428 static void iio_dev_release(struct device *device)
1429 {
1430 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1431 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1432 iio_device_unregister_trigger_consumer(indio_dev);
1433 iio_device_unregister_eventset(indio_dev);
1434 iio_device_unregister_sysfs(indio_dev);
1435
1436 iio_buffer_put(indio_dev->buffer);
1437
1438 ida_simple_remove(&iio_ida, indio_dev->id);
1439 kfree(indio_dev);
1440 }
1441
1442 struct device_type iio_device_type = {
1443 .name = "iio_device",
1444 .release = iio_dev_release,
1445 };
1446
1447 /**
1448 * iio_device_alloc() - allocate an iio_dev from a driver
1449 * @sizeof_priv: Space to allocate for private structure.
1450 **/
1451 struct iio_dev *iio_device_alloc(int sizeof_priv)
1452 {
1453 struct iio_dev *dev;
1454 size_t alloc_size;
1455
1456 alloc_size = sizeof(struct iio_dev);
1457 if (sizeof_priv) {
1458 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1459 alloc_size += sizeof_priv;
1460 }
1461 /* ensure 32-byte alignment of whole construct ? */
1462 alloc_size += IIO_ALIGN - 1;
1463
1464 dev = kzalloc(alloc_size, GFP_KERNEL);
1465
1466 if (dev) {
1467 dev->dev.groups = dev->groups;
1468 dev->dev.type = &iio_device_type;
1469 dev->dev.bus = &iio_bus_type;
1470 device_initialize(&dev->dev);
1471 dev_set_drvdata(&dev->dev, (void *)dev);
1472 mutex_init(&dev->mlock);
1473 mutex_init(&dev->info_exist_lock);
1474 INIT_LIST_HEAD(&dev->channel_attr_list);
1475
1476 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1477 if (dev->id < 0) {
1478 /* cannot use a dev_err as the name isn't available */
1479 pr_err("failed to get device id\n");
1480 kfree(dev);
1481 return NULL;
1482 }
1483 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1484 INIT_LIST_HEAD(&dev->buffer_list);
1485 }
1486
1487 return dev;
1488 }
1489 EXPORT_SYMBOL(iio_device_alloc);
1490
1491 /**
1492 * iio_device_free() - free an iio_dev from a driver
1493 * @dev: the iio_dev associated with the device
1494 **/
1495 void iio_device_free(struct iio_dev *dev)
1496 {
1497 if (dev)
1498 put_device(&dev->dev);
1499 }
1500 EXPORT_SYMBOL(iio_device_free);
1501
1502 static void devm_iio_device_release(struct device *dev, void *res)
1503 {
1504 iio_device_free(*(struct iio_dev **)res);
1505 }
1506
1507 int devm_iio_device_match(struct device *dev, void *res, void *data)
1508 {
1509 struct iio_dev **r = res;
1510 if (!r || !*r) {
1511 WARN_ON(!r || !*r);
1512 return 0;
1513 }
1514 return *r == data;
1515 }
1516 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1517
1518 /**
1519 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1520 * @dev: Device to allocate iio_dev for
1521 * @sizeof_priv: Space to allocate for private structure.
1522 *
1523 * Managed iio_device_alloc. iio_dev allocated with this function is
1524 * automatically freed on driver detach.
1525 *
1526 * If an iio_dev allocated with this function needs to be freed separately,
1527 * devm_iio_device_free() must be used.
1528 *
1529 * RETURNS:
1530 * Pointer to allocated iio_dev on success, NULL on failure.
1531 */
1532 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1533 {
1534 struct iio_dev **ptr, *iio_dev;
1535
1536 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1537 GFP_KERNEL);
1538 if (!ptr)
1539 return NULL;
1540
1541 iio_dev = iio_device_alloc(sizeof_priv);
1542 if (iio_dev) {
1543 *ptr = iio_dev;
1544 devres_add(dev, ptr);
1545 } else {
1546 devres_free(ptr);
1547 }
1548
1549 return iio_dev;
1550 }
1551 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1552
1553 /**
1554 * devm_iio_device_free - Resource-managed iio_device_free()
1555 * @dev: Device this iio_dev belongs to
1556 * @iio_dev: the iio_dev associated with the device
1557 *
1558 * Free iio_dev allocated with devm_iio_device_alloc().
1559 */
1560 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1561 {
1562 int rc;
1563
1564 rc = devres_release(dev, devm_iio_device_release,
1565 devm_iio_device_match, iio_dev);
1566 WARN_ON(rc);
1567 }
1568 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1569
1570 /**
1571 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1572 * @inode: Inode structure for identifying the device in the file system
1573 * @filp: File structure for iio device used to keep and later access
1574 * private data
1575 *
1576 * Return: 0 on success or -EBUSY if the device is already opened
1577 **/
1578 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1579 {
1580 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1581 struct iio_dev, chrdev);
1582
1583 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1584 return -EBUSY;
1585
1586 iio_device_get(indio_dev);
1587
1588 filp->private_data = indio_dev;
1589
1590 return 0;
1591 }
1592
1593 /**
1594 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1595 * @inode: Inode structure pointer for the char device
1596 * @filp: File structure pointer for the char device
1597 *
1598 * Return: 0 for successful release
1599 */
1600 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1601 {
1602 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1603 struct iio_dev, chrdev);
1604 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1605 iio_device_put(indio_dev);
1606
1607 return 0;
1608 }
1609
1610 /* Somewhat of a cross file organization violation - ioctls here are actually
1611 * event related */
1612 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1613 {
1614 struct iio_dev *indio_dev = filp->private_data;
1615 int __user *ip = (int __user *)arg;
1616 int fd;
1617
1618 if (!indio_dev->info)
1619 return -ENODEV;
1620
1621 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1622 fd = iio_event_getfd(indio_dev);
1623 if (fd < 0)
1624 return fd;
1625 if (copy_to_user(ip, &fd, sizeof(fd)))
1626 return -EFAULT;
1627 return 0;
1628 }
1629 return -EINVAL;
1630 }
1631
1632 static const struct file_operations iio_buffer_fileops = {
1633 .read = iio_buffer_read_first_n_outer_addr,
1634 .release = iio_chrdev_release,
1635 .open = iio_chrdev_open,
1636 .poll = iio_buffer_poll_addr,
1637 .owner = THIS_MODULE,
1638 .llseek = noop_llseek,
1639 .unlocked_ioctl = iio_ioctl,
1640 .compat_ioctl = iio_ioctl,
1641 };
1642
1643 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1644 {
1645 int i, j;
1646 const struct iio_chan_spec *channels = indio_dev->channels;
1647
1648 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1649 return 0;
1650
1651 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1652 if (channels[i].scan_index < 0)
1653 continue;
1654 for (j = i + 1; j < indio_dev->num_channels; j++)
1655 if (channels[i].scan_index == channels[j].scan_index) {
1656 dev_err(&indio_dev->dev,
1657 "Duplicate scan index %d\n",
1658 channels[i].scan_index);
1659 return -EINVAL;
1660 }
1661 }
1662
1663 return 0;
1664 }
1665
1666 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1667
1668 /**
1669 * iio_device_register() - register a device with the IIO subsystem
1670 * @indio_dev: Device structure filled by the device driver
1671 **/
1672 int iio_device_register(struct iio_dev *indio_dev)
1673 {
1674 int ret;
1675
1676 /* If the calling driver did not initialize of_node, do it here */
1677 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1678 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1679
1680 ret = iio_check_unique_scan_index(indio_dev);
1681 if (ret < 0)
1682 return ret;
1683
1684 /* configure elements for the chrdev */
1685 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1686
1687 ret = iio_device_register_debugfs(indio_dev);
1688 if (ret) {
1689 dev_err(indio_dev->dev.parent,
1690 "Failed to register debugfs interfaces\n");
1691 return ret;
1692 }
1693
1694 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1695 if (ret) {
1696 dev_err(indio_dev->dev.parent,
1697 "Failed to create buffer sysfs interfaces\n");
1698 goto error_unreg_debugfs;
1699 }
1700
1701 ret = iio_device_register_sysfs(indio_dev);
1702 if (ret) {
1703 dev_err(indio_dev->dev.parent,
1704 "Failed to register sysfs interfaces\n");
1705 goto error_buffer_free_sysfs;
1706 }
1707 ret = iio_device_register_eventset(indio_dev);
1708 if (ret) {
1709 dev_err(indio_dev->dev.parent,
1710 "Failed to register event set\n");
1711 goto error_free_sysfs;
1712 }
1713 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1714 iio_device_register_trigger_consumer(indio_dev);
1715
1716 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1717 indio_dev->setup_ops == NULL)
1718 indio_dev->setup_ops = &noop_ring_setup_ops;
1719
1720 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1721 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1722
1723 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1724 if (ret < 0)
1725 goto error_unreg_eventset;
1726
1727 return 0;
1728
1729 error_unreg_eventset:
1730 iio_device_unregister_eventset(indio_dev);
1731 error_free_sysfs:
1732 iio_device_unregister_sysfs(indio_dev);
1733 error_buffer_free_sysfs:
1734 iio_buffer_free_sysfs_and_mask(indio_dev);
1735 error_unreg_debugfs:
1736 iio_device_unregister_debugfs(indio_dev);
1737 return ret;
1738 }
1739 EXPORT_SYMBOL(iio_device_register);
1740
1741 /**
1742 * iio_device_unregister() - unregister a device from the IIO subsystem
1743 * @indio_dev: Device structure representing the device.
1744 **/
1745 void iio_device_unregister(struct iio_dev *indio_dev)
1746 {
1747 mutex_lock(&indio_dev->info_exist_lock);
1748
1749 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1750
1751 iio_device_unregister_debugfs(indio_dev);
1752
1753 iio_disable_all_buffers(indio_dev);
1754
1755 indio_dev->info = NULL;
1756
1757 iio_device_wakeup_eventset(indio_dev);
1758 iio_buffer_wakeup_poll(indio_dev);
1759
1760 mutex_unlock(&indio_dev->info_exist_lock);
1761
1762 iio_buffer_free_sysfs_and_mask(indio_dev);
1763 }
1764 EXPORT_SYMBOL(iio_device_unregister);
1765
1766 static void devm_iio_device_unreg(struct device *dev, void *res)
1767 {
1768 iio_device_unregister(*(struct iio_dev **)res);
1769 }
1770
1771 /**
1772 * devm_iio_device_register - Resource-managed iio_device_register()
1773 * @dev: Device to allocate iio_dev for
1774 * @indio_dev: Device structure filled by the device driver
1775 *
1776 * Managed iio_device_register. The IIO device registered with this
1777 * function is automatically unregistered on driver detach. This function
1778 * calls iio_device_register() internally. Refer to that function for more
1779 * information.
1780 *
1781 * If an iio_dev registered with this function needs to be unregistered
1782 * separately, devm_iio_device_unregister() must be used.
1783 *
1784 * RETURNS:
1785 * 0 on success, negative error number on failure.
1786 */
1787 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
1788 {
1789 struct iio_dev **ptr;
1790 int ret;
1791
1792 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1793 if (!ptr)
1794 return -ENOMEM;
1795
1796 *ptr = indio_dev;
1797 ret = iio_device_register(indio_dev);
1798 if (!ret)
1799 devres_add(dev, ptr);
1800 else
1801 devres_free(ptr);
1802
1803 return ret;
1804 }
1805 EXPORT_SYMBOL_GPL(devm_iio_device_register);
1806
1807 /**
1808 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1809 * @dev: Device this iio_dev belongs to
1810 * @indio_dev: the iio_dev associated with the device
1811 *
1812 * Unregister iio_dev registered with devm_iio_device_register().
1813 */
1814 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1815 {
1816 int rc;
1817
1818 rc = devres_release(dev, devm_iio_device_unreg,
1819 devm_iio_device_match, indio_dev);
1820 WARN_ON(rc);
1821 }
1822 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1823
1824 /**
1825 * iio_device_claim_direct_mode - Keep device in direct mode
1826 * @indio_dev: the iio_dev associated with the device
1827 *
1828 * If the device is in direct mode it is guaranteed to stay
1829 * that way until iio_device_release_direct_mode() is called.
1830 *
1831 * Use with iio_device_release_direct_mode()
1832 *
1833 * Returns: 0 on success, -EBUSY on failure
1834 */
1835 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1836 {
1837 mutex_lock(&indio_dev->mlock);
1838
1839 if (iio_buffer_enabled(indio_dev)) {
1840 mutex_unlock(&indio_dev->mlock);
1841 return -EBUSY;
1842 }
1843 return 0;
1844 }
1845 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1846
1847 /**
1848 * iio_device_release_direct_mode - releases claim on direct mode
1849 * @indio_dev: the iio_dev associated with the device
1850 *
1851 * Release the claim. Device is no longer guaranteed to stay
1852 * in direct mode.
1853 *
1854 * Use with iio_device_claim_direct_mode()
1855 */
1856 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1857 {
1858 mutex_unlock(&indio_dev->mlock);
1859 }
1860 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1861
1862 subsys_initcall(iio_init);
1863 module_exit(iio_exit);
1864
1865 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1866 MODULE_DESCRIPTION("Industrial I/O core");
1867 MODULE_LICENSE("GPL");
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git