]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/iio/industrialio-core.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
HID: rmi: fallback to generic/multitouch if hid-rmi is not built
[mirror_ubuntu-artful-kernel.git] / drivers / iio / industrialio-core.c
1 /* The industrial I/O core
2 *
3 * Copyright (c) 2008 Jonathan Cameron
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * Based on elements of hwmon and input subsystems.
10 */
11
12 #define pr_fmt(fmt) "iio-core: " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/idr.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/fs.h>
21 #include <linux/poll.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/cdev.h>
25 #include <linux/slab.h>
26 #include <linux/anon_inodes.h>
27 #include <linux/debugfs.h>
28 #include <linux/mutex.h>
29 #include <linux/iio/iio.h>
30 #include "iio_core.h"
31 #include "iio_core_trigger.h"
32 #include <linux/iio/sysfs.h>
33 #include <linux/iio/events.h>
34 #include <linux/iio/buffer.h>
35
36 /* IDA to assign each registered device a unique id */
37 static DEFINE_IDA(iio_ida);
38
39 static dev_t iio_devt;
40
41 #define IIO_DEV_MAX 256
42 struct bus_type iio_bus_type = {
43 .name = "iio",
44 };
45 EXPORT_SYMBOL(iio_bus_type);
46
47 static struct dentry *iio_debugfs_dentry;
48
49 static const char * const iio_direction[] = {
50 [0] = "in",
51 [1] = "out",
52 };
53
54 static const char * const iio_chan_type_name_spec[] = {
55 [IIO_VOLTAGE] = "voltage",
56 [IIO_CURRENT] = "current",
57 [IIO_POWER] = "power",
58 [IIO_ACCEL] = "accel",
59 [IIO_ANGL_VEL] = "anglvel",
60 [IIO_MAGN] = "magn",
61 [IIO_LIGHT] = "illuminance",
62 [IIO_INTENSITY] = "intensity",
63 [IIO_PROXIMITY] = "proximity",
64 [IIO_TEMP] = "temp",
65 [IIO_INCLI] = "incli",
66 [IIO_ROT] = "rot",
67 [IIO_ANGL] = "angl",
68 [IIO_TIMESTAMP] = "timestamp",
69 [IIO_CAPACITANCE] = "capacitance",
70 [IIO_ALTVOLTAGE] = "altvoltage",
71 [IIO_CCT] = "cct",
72 [IIO_PRESSURE] = "pressure",
73 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
74 [IIO_ACTIVITY] = "activity",
75 [IIO_STEPS] = "steps",
76 [IIO_ENERGY] = "energy",
77 [IIO_DISTANCE] = "distance",
78 [IIO_VELOCITY] = "velocity",
79 [IIO_CONCENTRATION] = "concentration",
80 [IIO_RESISTANCE] = "resistance",
81 [IIO_PH] = "ph",
82 [IIO_UVINDEX] = "uvindex",
83 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
84 [IIO_COUNT] = "count",
85 [IIO_INDEX] = "index",
86 };
87
88 static const char * const iio_modifier_names[] = {
89 [IIO_MOD_X] = "x",
90 [IIO_MOD_Y] = "y",
91 [IIO_MOD_Z] = "z",
92 [IIO_MOD_X_AND_Y] = "x&y",
93 [IIO_MOD_X_AND_Z] = "x&z",
94 [IIO_MOD_Y_AND_Z] = "y&z",
95 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
96 [IIO_MOD_X_OR_Y] = "x|y",
97 [IIO_MOD_X_OR_Z] = "x|z",
98 [IIO_MOD_Y_OR_Z] = "y|z",
99 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
100 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
101 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
102 [IIO_MOD_LIGHT_BOTH] = "both",
103 [IIO_MOD_LIGHT_IR] = "ir",
104 [IIO_MOD_LIGHT_CLEAR] = "clear",
105 [IIO_MOD_LIGHT_RED] = "red",
106 [IIO_MOD_LIGHT_GREEN] = "green",
107 [IIO_MOD_LIGHT_BLUE] = "blue",
108 [IIO_MOD_LIGHT_UV] = "uv",
109 [IIO_MOD_QUATERNION] = "quaternion",
110 [IIO_MOD_TEMP_AMBIENT] = "ambient",
111 [IIO_MOD_TEMP_OBJECT] = "object",
112 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
113 [IIO_MOD_NORTH_TRUE] = "from_north_true",
114 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
115 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
116 [IIO_MOD_RUNNING] = "running",
117 [IIO_MOD_JOGGING] = "jogging",
118 [IIO_MOD_WALKING] = "walking",
119 [IIO_MOD_STILL] = "still",
120 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
121 [IIO_MOD_I] = "i",
122 [IIO_MOD_Q] = "q",
123 [IIO_MOD_CO2] = "co2",
124 [IIO_MOD_VOC] = "voc",
125 };
126
127 /* relies on pairs of these shared then separate */
128 static const char * const iio_chan_info_postfix[] = {
129 [IIO_CHAN_INFO_RAW] = "raw",
130 [IIO_CHAN_INFO_PROCESSED] = "input",
131 [IIO_CHAN_INFO_SCALE] = "scale",
132 [IIO_CHAN_INFO_OFFSET] = "offset",
133 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
134 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
135 [IIO_CHAN_INFO_PEAK] = "peak_raw",
136 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
137 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
138 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
139 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
140 = "filter_low_pass_3db_frequency",
141 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
142 = "filter_high_pass_3db_frequency",
143 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
144 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
145 [IIO_CHAN_INFO_PHASE] = "phase",
146 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
147 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
148 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
149 [IIO_CHAN_INFO_ENABLE] = "en",
150 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
151 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
152 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
153 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
154 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
155 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
156 };
157
158 /**
159 * iio_find_channel_from_si() - get channel from its scan index
160 * @indio_dev: device
161 * @si: scan index to match
162 */
163 const struct iio_chan_spec
164 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
165 {
166 int i;
167
168 for (i = 0; i < indio_dev->num_channels; i++)
169 if (indio_dev->channels[i].scan_index == si)
170 return &indio_dev->channels[i];
171 return NULL;
172 }
173
174 /* This turns up an awful lot */
175 ssize_t iio_read_const_attr(struct device *dev,
176 struct device_attribute *attr,
177 char *buf)
178 {
179 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
180 }
181 EXPORT_SYMBOL(iio_read_const_attr);
182
183 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
184 {
185 int ret;
186 const struct iio_event_interface *ev_int = indio_dev->event_interface;
187
188 ret = mutex_lock_interruptible(&indio_dev->mlock);
189 if (ret)
190 return ret;
191 if ((ev_int && iio_event_enabled(ev_int)) ||
192 iio_buffer_enabled(indio_dev)) {
193 mutex_unlock(&indio_dev->mlock);
194 return -EBUSY;
195 }
196 indio_dev->clock_id = clock_id;
197 mutex_unlock(&indio_dev->mlock);
198
199 return 0;
200 }
201
202 /**
203 * iio_get_time_ns() - utility function to get a time stamp for events etc
204 * @indio_dev: device
205 */
206 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
207 {
208 struct timespec tp;
209
210 switch (iio_device_get_clock(indio_dev)) {
211 case CLOCK_REALTIME:
212 ktime_get_real_ts(&tp);
213 break;
214 case CLOCK_MONOTONIC:
215 ktime_get_ts(&tp);
216 break;
217 case CLOCK_MONOTONIC_RAW:
218 getrawmonotonic(&tp);
219 break;
220 case CLOCK_REALTIME_COARSE:
221 tp = current_kernel_time();
222 break;
223 case CLOCK_MONOTONIC_COARSE:
224 tp = get_monotonic_coarse();
225 break;
226 case CLOCK_BOOTTIME:
227 get_monotonic_boottime(&tp);
228 break;
229 case CLOCK_TAI:
230 timekeeping_clocktai(&tp);
231 break;
232 default:
233 BUG();
234 }
235
236 return timespec_to_ns(&tp);
237 }
238 EXPORT_SYMBOL(iio_get_time_ns);
239
240 /**
241 * iio_get_time_res() - utility function to get time stamp clock resolution in
242 * nano seconds.
243 * @indio_dev: device
244 */
245 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
246 {
247 switch (iio_device_get_clock(indio_dev)) {
248 case CLOCK_REALTIME:
249 case CLOCK_MONOTONIC:
250 case CLOCK_MONOTONIC_RAW:
251 case CLOCK_BOOTTIME:
252 case CLOCK_TAI:
253 return hrtimer_resolution;
254 case CLOCK_REALTIME_COARSE:
255 case CLOCK_MONOTONIC_COARSE:
256 return LOW_RES_NSEC;
257 default:
258 BUG();
259 }
260 }
261 EXPORT_SYMBOL(iio_get_time_res);
262
263 static int __init iio_init(void)
264 {
265 int ret;
266
267 /* Register sysfs bus */
268 ret = bus_register(&iio_bus_type);
269 if (ret < 0) {
270 pr_err("could not register bus type\n");
271 goto error_nothing;
272 }
273
274 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
275 if (ret < 0) {
276 pr_err("failed to allocate char dev region\n");
277 goto error_unregister_bus_type;
278 }
279
280 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
281
282 return 0;
283
284 error_unregister_bus_type:
285 bus_unregister(&iio_bus_type);
286 error_nothing:
287 return ret;
288 }
289
290 static void __exit iio_exit(void)
291 {
292 if (iio_devt)
293 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
294 bus_unregister(&iio_bus_type);
295 debugfs_remove(iio_debugfs_dentry);
296 }
297
298 #if defined(CONFIG_DEBUG_FS)
299 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
300 size_t count, loff_t *ppos)
301 {
302 struct iio_dev *indio_dev = file->private_data;
303 char buf[20];
304 unsigned val = 0;
305 ssize_t len;
306 int ret;
307
308 ret = indio_dev->info->debugfs_reg_access(indio_dev,
309 indio_dev->cached_reg_addr,
310 0, &val);
311 if (ret)
312 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
313
314 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
315
316 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
317 }
318
319 static ssize_t iio_debugfs_write_reg(struct file *file,
320 const char __user *userbuf, size_t count, loff_t *ppos)
321 {
322 struct iio_dev *indio_dev = file->private_data;
323 unsigned reg, val;
324 char buf[80];
325 int ret;
326
327 count = min_t(size_t, count, (sizeof(buf)-1));
328 if (copy_from_user(buf, userbuf, count))
329 return -EFAULT;
330
331 buf[count] = 0;
332
333 ret = sscanf(buf, "%i %i", &reg, &val);
334
335 switch (ret) {
336 case 1:
337 indio_dev->cached_reg_addr = reg;
338 break;
339 case 2:
340 indio_dev->cached_reg_addr = reg;
341 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
342 val, NULL);
343 if (ret) {
344 dev_err(indio_dev->dev.parent, "%s: write failed\n",
345 __func__);
346 return ret;
347 }
348 break;
349 default:
350 return -EINVAL;
351 }
352
353 return count;
354 }
355
356 static const struct file_operations iio_debugfs_reg_fops = {
357 .open = simple_open,
358 .read = iio_debugfs_read_reg,
359 .write = iio_debugfs_write_reg,
360 };
361
362 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
363 {
364 debugfs_remove_recursive(indio_dev->debugfs_dentry);
365 }
366
367 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
368 {
369 struct dentry *d;
370
371 if (indio_dev->info->debugfs_reg_access == NULL)
372 return 0;
373
374 if (!iio_debugfs_dentry)
375 return 0;
376
377 indio_dev->debugfs_dentry =
378 debugfs_create_dir(dev_name(&indio_dev->dev),
379 iio_debugfs_dentry);
380 if (indio_dev->debugfs_dentry == NULL) {
381 dev_warn(indio_dev->dev.parent,
382 "Failed to create debugfs directory\n");
383 return -EFAULT;
384 }
385
386 d = debugfs_create_file("direct_reg_access", 0644,
387 indio_dev->debugfs_dentry,
388 indio_dev, &iio_debugfs_reg_fops);
389 if (!d) {
390 iio_device_unregister_debugfs(indio_dev);
391 return -ENOMEM;
392 }
393
394 return 0;
395 }
396 #else
397 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
398 {
399 return 0;
400 }
401
402 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
403 {
404 }
405 #endif /* CONFIG_DEBUG_FS */
406
407 static ssize_t iio_read_channel_ext_info(struct device *dev,
408 struct device_attribute *attr,
409 char *buf)
410 {
411 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
412 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
413 const struct iio_chan_spec_ext_info *ext_info;
414
415 ext_info = &this_attr->c->ext_info[this_attr->address];
416
417 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
418 }
419
420 static ssize_t iio_write_channel_ext_info(struct device *dev,
421 struct device_attribute *attr,
422 const char *buf,
423 size_t len)
424 {
425 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
426 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
427 const struct iio_chan_spec_ext_info *ext_info;
428
429 ext_info = &this_attr->c->ext_info[this_attr->address];
430
431 return ext_info->write(indio_dev, ext_info->private,
432 this_attr->c, buf, len);
433 }
434
435 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
436 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
437 {
438 const struct iio_enum *e = (const struct iio_enum *)priv;
439 unsigned int i;
440 size_t len = 0;
441
442 if (!e->num_items)
443 return 0;
444
445 for (i = 0; i < e->num_items; ++i)
446 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
447
448 /* replace last space with a newline */
449 buf[len - 1] = '\n';
450
451 return len;
452 }
453 EXPORT_SYMBOL_GPL(iio_enum_available_read);
454
455 ssize_t iio_enum_read(struct iio_dev *indio_dev,
456 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
457 {
458 const struct iio_enum *e = (const struct iio_enum *)priv;
459 int i;
460
461 if (!e->get)
462 return -EINVAL;
463
464 i = e->get(indio_dev, chan);
465 if (i < 0)
466 return i;
467 else if (i >= e->num_items)
468 return -EINVAL;
469
470 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
471 }
472 EXPORT_SYMBOL_GPL(iio_enum_read);
473
474 ssize_t iio_enum_write(struct iio_dev *indio_dev,
475 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
476 size_t len)
477 {
478 const struct iio_enum *e = (const struct iio_enum *)priv;
479 unsigned int i;
480 int ret;
481
482 if (!e->set)
483 return -EINVAL;
484
485 for (i = 0; i < e->num_items; i++) {
486 if (sysfs_streq(buf, e->items[i]))
487 break;
488 }
489
490 if (i == e->num_items)
491 return -EINVAL;
492
493 ret = e->set(indio_dev, chan, i);
494 return ret ? ret : len;
495 }
496 EXPORT_SYMBOL_GPL(iio_enum_write);
497
498 static const struct iio_mount_matrix iio_mount_idmatrix = {
499 .rotation = {
500 "1", "0", "0",
501 "0", "1", "0",
502 "0", "0", "1"
503 }
504 };
505
506 static int iio_setup_mount_idmatrix(const struct device *dev,
507 struct iio_mount_matrix *matrix)
508 {
509 *matrix = iio_mount_idmatrix;
510 dev_info(dev, "mounting matrix not found: using identity...\n");
511 return 0;
512 }
513
514 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
515 const struct iio_chan_spec *chan, char *buf)
516 {
517 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
518 priv)(indio_dev, chan);
519
520 if (IS_ERR(mtx))
521 return PTR_ERR(mtx);
522
523 if (!mtx)
524 mtx = &iio_mount_idmatrix;
525
526 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
527 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
528 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
529 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
530 }
531 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
532
533 /**
534 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
535 * device-tree "mount-matrix" property
536 * @dev: device the mounting matrix property is assigned to
537 * @propname: device specific mounting matrix property name
538 * @matrix: where to store retrieved matrix
539 *
540 * If device is assigned no mounting matrix property, a default 3x3 identity
541 * matrix will be filled in.
542 *
543 * Return: 0 if success, or a negative error code on failure.
544 */
545 #ifdef CONFIG_OF
546 int of_iio_read_mount_matrix(const struct device *dev,
547 const char *propname,
548 struct iio_mount_matrix *matrix)
549 {
550 if (dev->of_node) {
551 int err = of_property_read_string_array(dev->of_node,
552 propname, matrix->rotation,
553 ARRAY_SIZE(iio_mount_idmatrix.rotation));
554
555 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
556 return 0;
557
558 if (err >= 0)
559 /* Invalid number of matrix entries. */
560 return -EINVAL;
561
562 if (err != -EINVAL)
563 /* Invalid matrix declaration format. */
564 return err;
565 }
566
567 /* Matrix was not declared at all: fallback to identity. */
568 return iio_setup_mount_idmatrix(dev, matrix);
569 }
570 #else
571 int of_iio_read_mount_matrix(const struct device *dev,
572 const char *propname,
573 struct iio_mount_matrix *matrix)
574 {
575 return iio_setup_mount_idmatrix(dev, matrix);
576 }
577 #endif
578 EXPORT_SYMBOL(of_iio_read_mount_matrix);
579
580 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
581 int size, const int *vals)
582 {
583 unsigned long long tmp;
584 int tmp0, tmp1;
585 bool scale_db = false;
586
587 switch (type) {
588 case IIO_VAL_INT:
589 return snprintf(buf, len, "%d", vals[0]);
590 case IIO_VAL_INT_PLUS_MICRO_DB:
591 scale_db = true;
592 case IIO_VAL_INT_PLUS_MICRO:
593 if (vals[1] < 0)
594 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
595 -vals[1], scale_db ? " dB" : "");
596 else
597 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
598 scale_db ? " dB" : "");
599 case IIO_VAL_INT_PLUS_NANO:
600 if (vals[1] < 0)
601 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
602 -vals[1]);
603 else
604 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
605 case IIO_VAL_FRACTIONAL:
606 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
607 tmp1 = vals[1];
608 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
609 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
610 case IIO_VAL_FRACTIONAL_LOG2:
611 tmp = (s64)vals[0] * 1000000000LL >> vals[1];
612 tmp1 = do_div(tmp, 1000000000LL);
613 tmp0 = tmp;
614 return snprintf(buf, len, "%d.%09u", tmp0, tmp1);
615 case IIO_VAL_INT_MULTIPLE:
616 {
617 int i;
618 int l = 0;
619
620 for (i = 0; i < size; ++i) {
621 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
622 if (l >= len)
623 break;
624 }
625 return l;
626 }
627 default:
628 return 0;
629 }
630 }
631
632 /**
633 * iio_format_value() - Formats a IIO value into its string representation
634 * @buf: The buffer to which the formatted value gets written
635 * which is assumed to be big enough (i.e. PAGE_SIZE).
636 * @type: One of the IIO_VAL_... constants. This decides how the val
637 * and val2 parameters are formatted.
638 * @size: Number of IIO value entries contained in vals
639 * @vals: Pointer to the values, exact meaning depends on the
640 * type parameter.
641 *
642 * Return: 0 by default, a negative number on failure or the
643 * total number of characters written for a type that belongs
644 * to the IIO_VAL_... constant.
645 */
646 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
647 {
648 ssize_t len;
649
650 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
651 if (len >= PAGE_SIZE - 1)
652 return -EFBIG;
653
654 return len + sprintf(buf + len, "\n");
655 }
656 EXPORT_SYMBOL_GPL(iio_format_value);
657
658 static ssize_t iio_read_channel_info(struct device *dev,
659 struct device_attribute *attr,
660 char *buf)
661 {
662 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
663 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
664 int vals[INDIO_MAX_RAW_ELEMENTS];
665 int ret;
666 int val_len = 2;
667
668 if (indio_dev->info->read_raw_multi)
669 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
670 INDIO_MAX_RAW_ELEMENTS,
671 vals, &val_len,
672 this_attr->address);
673 else
674 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
675 &vals[0], &vals[1], this_attr->address);
676
677 if (ret < 0)
678 return ret;
679
680 return iio_format_value(buf, ret, val_len, vals);
681 }
682
683 static ssize_t iio_format_avail_list(char *buf, const int *vals,
684 int type, int length)
685 {
686 int i;
687 ssize_t len = 0;
688
689 switch (type) {
690 case IIO_VAL_INT:
691 for (i = 0; i < length; i++) {
692 len += __iio_format_value(buf + len, PAGE_SIZE - len,
693 type, 1, &vals[i]);
694 if (len >= PAGE_SIZE)
695 return -EFBIG;
696 if (i < length - 1)
697 len += snprintf(buf + len, PAGE_SIZE - len,
698 " ");
699 else
700 len += snprintf(buf + len, PAGE_SIZE - len,
701 "\n");
702 if (len >= PAGE_SIZE)
703 return -EFBIG;
704 }
705 break;
706 default:
707 for (i = 0; i < length / 2; i++) {
708 len += __iio_format_value(buf + len, PAGE_SIZE - len,
709 type, 2, &vals[i * 2]);
710 if (len >= PAGE_SIZE)
711 return -EFBIG;
712 if (i < length / 2 - 1)
713 len += snprintf(buf + len, PAGE_SIZE - len,
714 " ");
715 else
716 len += snprintf(buf + len, PAGE_SIZE - len,
717 "\n");
718 if (len >= PAGE_SIZE)
719 return -EFBIG;
720 }
721 }
722
723 return len;
724 }
725
726 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
727 {
728 int i;
729 ssize_t len;
730
731 len = snprintf(buf, PAGE_SIZE, "[");
732 switch (type) {
733 case IIO_VAL_INT:
734 for (i = 0; i < 3; i++) {
735 len += __iio_format_value(buf + len, PAGE_SIZE - len,
736 type, 1, &vals[i]);
737 if (len >= PAGE_SIZE)
738 return -EFBIG;
739 if (i < 2)
740 len += snprintf(buf + len, PAGE_SIZE - len,
741 " ");
742 else
743 len += snprintf(buf + len, PAGE_SIZE - len,
744 "]\n");
745 if (len >= PAGE_SIZE)
746 return -EFBIG;
747 }
748 break;
749 default:
750 for (i = 0; i < 3; i++) {
751 len += __iio_format_value(buf + len, PAGE_SIZE - len,
752 type, 2, &vals[i * 2]);
753 if (len >= PAGE_SIZE)
754 return -EFBIG;
755 if (i < 2)
756 len += snprintf(buf + len, PAGE_SIZE - len,
757 " ");
758 else
759 len += snprintf(buf + len, PAGE_SIZE - len,
760 "]\n");
761 if (len >= PAGE_SIZE)
762 return -EFBIG;
763 }
764 }
765
766 return len;
767 }
768
769 static ssize_t iio_read_channel_info_avail(struct device *dev,
770 struct device_attribute *attr,
771 char *buf)
772 {
773 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
774 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
775 const int *vals;
776 int ret;
777 int length;
778 int type;
779
780 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
781 &vals, &type, &length,
782 this_attr->address);
783
784 if (ret < 0)
785 return ret;
786 switch (ret) {
787 case IIO_AVAIL_LIST:
788 return iio_format_avail_list(buf, vals, type, length);
789 case IIO_AVAIL_RANGE:
790 return iio_format_avail_range(buf, vals, type);
791 default:
792 return -EINVAL;
793 }
794 }
795
796 /**
797 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
798 * @str: The string to parse
799 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
800 * @integer: The integer part of the number
801 * @fract: The fractional part of the number
802 *
803 * Returns 0 on success, or a negative error code if the string could not be
804 * parsed.
805 */
806 int iio_str_to_fixpoint(const char *str, int fract_mult,
807 int *integer, int *fract)
808 {
809 int i = 0, f = 0;
810 bool integer_part = true, negative = false;
811
812 if (fract_mult == 0) {
813 *fract = 0;
814
815 return kstrtoint(str, 0, integer);
816 }
817
818 if (str[0] == '-') {
819 negative = true;
820 str++;
821 } else if (str[0] == '+') {
822 str++;
823 }
824
825 while (*str) {
826 if ('0' <= *str && *str <= '9') {
827 if (integer_part) {
828 i = i * 10 + *str - '0';
829 } else {
830 f += fract_mult * (*str - '0');
831 fract_mult /= 10;
832 }
833 } else if (*str == '\n') {
834 if (*(str + 1) == '\0')
835 break;
836 else
837 return -EINVAL;
838 } else if (*str == '.' && integer_part) {
839 integer_part = false;
840 } else {
841 return -EINVAL;
842 }
843 str++;
844 }
845
846 if (negative) {
847 if (i)
848 i = -i;
849 else
850 f = -f;
851 }
852
853 *integer = i;
854 *fract = f;
855
856 return 0;
857 }
858 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
859
860 static ssize_t iio_write_channel_info(struct device *dev,
861 struct device_attribute *attr,
862 const char *buf,
863 size_t len)
864 {
865 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
866 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
867 int ret, fract_mult = 100000;
868 int integer, fract;
869
870 /* Assumes decimal - precision based on number of digits */
871 if (!indio_dev->info->write_raw)
872 return -EINVAL;
873
874 if (indio_dev->info->write_raw_get_fmt)
875 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
876 this_attr->c, this_attr->address)) {
877 case IIO_VAL_INT:
878 fract_mult = 0;
879 break;
880 case IIO_VAL_INT_PLUS_MICRO:
881 fract_mult = 100000;
882 break;
883 case IIO_VAL_INT_PLUS_NANO:
884 fract_mult = 100000000;
885 break;
886 default:
887 return -EINVAL;
888 }
889
890 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
891 if (ret)
892 return ret;
893
894 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
895 integer, fract, this_attr->address);
896 if (ret)
897 return ret;
898
899 return len;
900 }
901
902 static
903 int __iio_device_attr_init(struct device_attribute *dev_attr,
904 const char *postfix,
905 struct iio_chan_spec const *chan,
906 ssize_t (*readfunc)(struct device *dev,
907 struct device_attribute *attr,
908 char *buf),
909 ssize_t (*writefunc)(struct device *dev,
910 struct device_attribute *attr,
911 const char *buf,
912 size_t len),
913 enum iio_shared_by shared_by)
914 {
915 int ret = 0;
916 char *name = NULL;
917 char *full_postfix;
918 sysfs_attr_init(&dev_attr->attr);
919
920 /* Build up postfix of <extend_name>_<modifier>_postfix */
921 if (chan->modified && (shared_by == IIO_SEPARATE)) {
922 if (chan->extend_name)
923 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
924 iio_modifier_names[chan
925 ->channel2],
926 chan->extend_name,
927 postfix);
928 else
929 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
930 iio_modifier_names[chan
931 ->channel2],
932 postfix);
933 } else {
934 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
935 full_postfix = kstrdup(postfix, GFP_KERNEL);
936 else
937 full_postfix = kasprintf(GFP_KERNEL,
938 "%s_%s",
939 chan->extend_name,
940 postfix);
941 }
942 if (full_postfix == NULL)
943 return -ENOMEM;
944
945 if (chan->differential) { /* Differential can not have modifier */
946 switch (shared_by) {
947 case IIO_SHARED_BY_ALL:
948 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
949 break;
950 case IIO_SHARED_BY_DIR:
951 name = kasprintf(GFP_KERNEL, "%s_%s",
952 iio_direction[chan->output],
953 full_postfix);
954 break;
955 case IIO_SHARED_BY_TYPE:
956 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
957 iio_direction[chan->output],
958 iio_chan_type_name_spec[chan->type],
959 iio_chan_type_name_spec[chan->type],
960 full_postfix);
961 break;
962 case IIO_SEPARATE:
963 if (!chan->indexed) {
964 WARN(1, "Differential channels must be indexed\n");
965 ret = -EINVAL;
966 goto error_free_full_postfix;
967 }
968 name = kasprintf(GFP_KERNEL,
969 "%s_%s%d-%s%d_%s",
970 iio_direction[chan->output],
971 iio_chan_type_name_spec[chan->type],
972 chan->channel,
973 iio_chan_type_name_spec[chan->type],
974 chan->channel2,
975 full_postfix);
976 break;
977 }
978 } else { /* Single ended */
979 switch (shared_by) {
980 case IIO_SHARED_BY_ALL:
981 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
982 break;
983 case IIO_SHARED_BY_DIR:
984 name = kasprintf(GFP_KERNEL, "%s_%s",
985 iio_direction[chan->output],
986 full_postfix);
987 break;
988 case IIO_SHARED_BY_TYPE:
989 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
990 iio_direction[chan->output],
991 iio_chan_type_name_spec[chan->type],
992 full_postfix);
993 break;
994
995 case IIO_SEPARATE:
996 if (chan->indexed)
997 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
998 iio_direction[chan->output],
999 iio_chan_type_name_spec[chan->type],
1000 chan->channel,
1001 full_postfix);
1002 else
1003 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1004 iio_direction[chan->output],
1005 iio_chan_type_name_spec[chan->type],
1006 full_postfix);
1007 break;
1008 }
1009 }
1010 if (name == NULL) {
1011 ret = -ENOMEM;
1012 goto error_free_full_postfix;
1013 }
1014 dev_attr->attr.name = name;
1015
1016 if (readfunc) {
1017 dev_attr->attr.mode |= S_IRUGO;
1018 dev_attr->show = readfunc;
1019 }
1020
1021 if (writefunc) {
1022 dev_attr->attr.mode |= S_IWUSR;
1023 dev_attr->store = writefunc;
1024 }
1025
1026 error_free_full_postfix:
1027 kfree(full_postfix);
1028
1029 return ret;
1030 }
1031
1032 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1033 {
1034 kfree(dev_attr->attr.name);
1035 }
1036
1037 int __iio_add_chan_devattr(const char *postfix,
1038 struct iio_chan_spec const *chan,
1039 ssize_t (*readfunc)(struct device *dev,
1040 struct device_attribute *attr,
1041 char *buf),
1042 ssize_t (*writefunc)(struct device *dev,
1043 struct device_attribute *attr,
1044 const char *buf,
1045 size_t len),
1046 u64 mask,
1047 enum iio_shared_by shared_by,
1048 struct device *dev,
1049 struct list_head *attr_list)
1050 {
1051 int ret;
1052 struct iio_dev_attr *iio_attr, *t;
1053
1054 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1055 if (iio_attr == NULL)
1056 return -ENOMEM;
1057 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1058 postfix, chan,
1059 readfunc, writefunc, shared_by);
1060 if (ret)
1061 goto error_iio_dev_attr_free;
1062 iio_attr->c = chan;
1063 iio_attr->address = mask;
1064 list_for_each_entry(t, attr_list, l)
1065 if (strcmp(t->dev_attr.attr.name,
1066 iio_attr->dev_attr.attr.name) == 0) {
1067 if (shared_by == IIO_SEPARATE)
1068 dev_err(dev, "tried to double register : %s\n",
1069 t->dev_attr.attr.name);
1070 ret = -EBUSY;
1071 goto error_device_attr_deinit;
1072 }
1073 list_add(&iio_attr->l, attr_list);
1074
1075 return 0;
1076
1077 error_device_attr_deinit:
1078 __iio_device_attr_deinit(&iio_attr->dev_attr);
1079 error_iio_dev_attr_free:
1080 kfree(iio_attr);
1081 return ret;
1082 }
1083
1084 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1085 struct iio_chan_spec const *chan,
1086 enum iio_shared_by shared_by,
1087 const long *infomask)
1088 {
1089 int i, ret, attrcount = 0;
1090
1091 for_each_set_bit(i, infomask, sizeof(infomask)*8) {
1092 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1093 return -EINVAL;
1094 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1095 chan,
1096 &iio_read_channel_info,
1097 &iio_write_channel_info,
1098 i,
1099 shared_by,
1100 &indio_dev->dev,
1101 &indio_dev->channel_attr_list);
1102 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1103 continue;
1104 else if (ret < 0)
1105 return ret;
1106 attrcount++;
1107 }
1108
1109 return attrcount;
1110 }
1111
1112 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1113 struct iio_chan_spec const *chan,
1114 enum iio_shared_by shared_by,
1115 const long *infomask)
1116 {
1117 int i, ret, attrcount = 0;
1118 char *avail_postfix;
1119
1120 for_each_set_bit(i, infomask, sizeof(infomask) * 8) {
1121 avail_postfix = kasprintf(GFP_KERNEL,
1122 "%s_available",
1123 iio_chan_info_postfix[i]);
1124 if (!avail_postfix)
1125 return -ENOMEM;
1126
1127 ret = __iio_add_chan_devattr(avail_postfix,
1128 chan,
1129 &iio_read_channel_info_avail,
1130 NULL,
1131 i,
1132 shared_by,
1133 &indio_dev->dev,
1134 &indio_dev->channel_attr_list);
1135 kfree(avail_postfix);
1136 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1137 continue;
1138 else if (ret < 0)
1139 return ret;
1140 attrcount++;
1141 }
1142
1143 return attrcount;
1144 }
1145
1146 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1147 struct iio_chan_spec const *chan)
1148 {
1149 int ret, attrcount = 0;
1150 const struct iio_chan_spec_ext_info *ext_info;
1151
1152 if (chan->channel < 0)
1153 return 0;
1154 ret = iio_device_add_info_mask_type(indio_dev, chan,
1155 IIO_SEPARATE,
1156 &chan->info_mask_separate);
1157 if (ret < 0)
1158 return ret;
1159 attrcount += ret;
1160
1161 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1162 IIO_SEPARATE,
1163 &chan->
1164 info_mask_separate_available);
1165 if (ret < 0)
1166 return ret;
1167 attrcount += ret;
1168
1169 ret = iio_device_add_info_mask_type(indio_dev, chan,
1170 IIO_SHARED_BY_TYPE,
1171 &chan->info_mask_shared_by_type);
1172 if (ret < 0)
1173 return ret;
1174 attrcount += ret;
1175
1176 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1177 IIO_SHARED_BY_TYPE,
1178 &chan->
1179 info_mask_shared_by_type_available);
1180 if (ret < 0)
1181 return ret;
1182 attrcount += ret;
1183
1184 ret = iio_device_add_info_mask_type(indio_dev, chan,
1185 IIO_SHARED_BY_DIR,
1186 &chan->info_mask_shared_by_dir);
1187 if (ret < 0)
1188 return ret;
1189 attrcount += ret;
1190
1191 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1192 IIO_SHARED_BY_DIR,
1193 &chan->info_mask_shared_by_dir_available);
1194 if (ret < 0)
1195 return ret;
1196 attrcount += ret;
1197
1198 ret = iio_device_add_info_mask_type(indio_dev, chan,
1199 IIO_SHARED_BY_ALL,
1200 &chan->info_mask_shared_by_all);
1201 if (ret < 0)
1202 return ret;
1203 attrcount += ret;
1204
1205 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1206 IIO_SHARED_BY_ALL,
1207 &chan->info_mask_shared_by_all_available);
1208 if (ret < 0)
1209 return ret;
1210 attrcount += ret;
1211
1212 if (chan->ext_info) {
1213 unsigned int i = 0;
1214 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1215 ret = __iio_add_chan_devattr(ext_info->name,
1216 chan,
1217 ext_info->read ?
1218 &iio_read_channel_ext_info : NULL,
1219 ext_info->write ?
1220 &iio_write_channel_ext_info : NULL,
1221 i,
1222 ext_info->shared,
1223 &indio_dev->dev,
1224 &indio_dev->channel_attr_list);
1225 i++;
1226 if (ret == -EBUSY && ext_info->shared)
1227 continue;
1228
1229 if (ret)
1230 return ret;
1231
1232 attrcount++;
1233 }
1234 }
1235
1236 return attrcount;
1237 }
1238
1239 /**
1240 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1241 * @attr_list: List of IIO device attributes
1242 *
1243 * This function frees the memory allocated for each of the IIO device
1244 * attributes in the list.
1245 */
1246 void iio_free_chan_devattr_list(struct list_head *attr_list)
1247 {
1248 struct iio_dev_attr *p, *n;
1249
1250 list_for_each_entry_safe(p, n, attr_list, l) {
1251 kfree(p->dev_attr.attr.name);
1252 list_del(&p->l);
1253 kfree(p);
1254 }
1255 }
1256
1257 static ssize_t iio_show_dev_name(struct device *dev,
1258 struct device_attribute *attr,
1259 char *buf)
1260 {
1261 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1262 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1263 }
1264
1265 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1266
1267 static ssize_t iio_show_timestamp_clock(struct device *dev,
1268 struct device_attribute *attr,
1269 char *buf)
1270 {
1271 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1272 const clockid_t clk = iio_device_get_clock(indio_dev);
1273 const char *name;
1274 ssize_t sz;
1275
1276 switch (clk) {
1277 case CLOCK_REALTIME:
1278 name = "realtime\n";
1279 sz = sizeof("realtime\n");
1280 break;
1281 case CLOCK_MONOTONIC:
1282 name = "monotonic\n";
1283 sz = sizeof("monotonic\n");
1284 break;
1285 case CLOCK_MONOTONIC_RAW:
1286 name = "monotonic_raw\n";
1287 sz = sizeof("monotonic_raw\n");
1288 break;
1289 case CLOCK_REALTIME_COARSE:
1290 name = "realtime_coarse\n";
1291 sz = sizeof("realtime_coarse\n");
1292 break;
1293 case CLOCK_MONOTONIC_COARSE:
1294 name = "monotonic_coarse\n";
1295 sz = sizeof("monotonic_coarse\n");
1296 break;
1297 case CLOCK_BOOTTIME:
1298 name = "boottime\n";
1299 sz = sizeof("boottime\n");
1300 break;
1301 case CLOCK_TAI:
1302 name = "tai\n";
1303 sz = sizeof("tai\n");
1304 break;
1305 default:
1306 BUG();
1307 }
1308
1309 memcpy(buf, name, sz);
1310 return sz;
1311 }
1312
1313 static ssize_t iio_store_timestamp_clock(struct device *dev,
1314 struct device_attribute *attr,
1315 const char *buf, size_t len)
1316 {
1317 clockid_t clk;
1318 int ret;
1319
1320 if (sysfs_streq(buf, "realtime"))
1321 clk = CLOCK_REALTIME;
1322 else if (sysfs_streq(buf, "monotonic"))
1323 clk = CLOCK_MONOTONIC;
1324 else if (sysfs_streq(buf, "monotonic_raw"))
1325 clk = CLOCK_MONOTONIC_RAW;
1326 else if (sysfs_streq(buf, "realtime_coarse"))
1327 clk = CLOCK_REALTIME_COARSE;
1328 else if (sysfs_streq(buf, "monotonic_coarse"))
1329 clk = CLOCK_MONOTONIC_COARSE;
1330 else if (sysfs_streq(buf, "boottime"))
1331 clk = CLOCK_BOOTTIME;
1332 else if (sysfs_streq(buf, "tai"))
1333 clk = CLOCK_TAI;
1334 else
1335 return -EINVAL;
1336
1337 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1338 if (ret)
1339 return ret;
1340
1341 return len;
1342 }
1343
1344 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1345 iio_show_timestamp_clock, iio_store_timestamp_clock);
1346
1347 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1348 {
1349 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1350 struct iio_dev_attr *p;
1351 struct attribute **attr, *clk = NULL;
1352
1353 /* First count elements in any existing group */
1354 if (indio_dev->info->attrs) {
1355 attr = indio_dev->info->attrs->attrs;
1356 while (*attr++ != NULL)
1357 attrcount_orig++;
1358 }
1359 attrcount = attrcount_orig;
1360 /*
1361 * New channel registration method - relies on the fact a group does
1362 * not need to be initialized if its name is NULL.
1363 */
1364 if (indio_dev->channels)
1365 for (i = 0; i < indio_dev->num_channels; i++) {
1366 const struct iio_chan_spec *chan =
1367 &indio_dev->channels[i];
1368
1369 if (chan->type == IIO_TIMESTAMP)
1370 clk = &dev_attr_current_timestamp_clock.attr;
1371
1372 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1373 if (ret < 0)
1374 goto error_clear_attrs;
1375 attrcount += ret;
1376 }
1377
1378 if (indio_dev->event_interface)
1379 clk = &dev_attr_current_timestamp_clock.attr;
1380
1381 if (indio_dev->name)
1382 attrcount++;
1383 if (clk)
1384 attrcount++;
1385
1386 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1387 sizeof(indio_dev->chan_attr_group.attrs[0]),
1388 GFP_KERNEL);
1389 if (indio_dev->chan_attr_group.attrs == NULL) {
1390 ret = -ENOMEM;
1391 goto error_clear_attrs;
1392 }
1393 /* Copy across original attributes */
1394 if (indio_dev->info->attrs)
1395 memcpy(indio_dev->chan_attr_group.attrs,
1396 indio_dev->info->attrs->attrs,
1397 sizeof(indio_dev->chan_attr_group.attrs[0])
1398 *attrcount_orig);
1399 attrn = attrcount_orig;
1400 /* Add all elements from the list. */
1401 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1402 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1403 if (indio_dev->name)
1404 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1405 if (clk)
1406 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1407
1408 indio_dev->groups[indio_dev->groupcounter++] =
1409 &indio_dev->chan_attr_group;
1410
1411 return 0;
1412
1413 error_clear_attrs:
1414 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1415
1416 return ret;
1417 }
1418
1419 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1420 {
1421
1422 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1423 kfree(indio_dev->chan_attr_group.attrs);
1424 indio_dev->chan_attr_group.attrs = NULL;
1425 }
1426
1427 static void iio_dev_release(struct device *device)
1428 {
1429 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1430 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1431 iio_device_unregister_trigger_consumer(indio_dev);
1432 iio_device_unregister_eventset(indio_dev);
1433 iio_device_unregister_sysfs(indio_dev);
1434
1435 iio_buffer_put(indio_dev->buffer);
1436
1437 ida_simple_remove(&iio_ida, indio_dev->id);
1438 kfree(indio_dev);
1439 }
1440
1441 struct device_type iio_device_type = {
1442 .name = "iio_device",
1443 .release = iio_dev_release,
1444 };
1445
1446 /**
1447 * iio_device_alloc() - allocate an iio_dev from a driver
1448 * @sizeof_priv: Space to allocate for private structure.
1449 **/
1450 struct iio_dev *iio_device_alloc(int sizeof_priv)
1451 {
1452 struct iio_dev *dev;
1453 size_t alloc_size;
1454
1455 alloc_size = sizeof(struct iio_dev);
1456 if (sizeof_priv) {
1457 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1458 alloc_size += sizeof_priv;
1459 }
1460 /* ensure 32-byte alignment of whole construct ? */
1461 alloc_size += IIO_ALIGN - 1;
1462
1463 dev = kzalloc(alloc_size, GFP_KERNEL);
1464
1465 if (dev) {
1466 dev->dev.groups = dev->groups;
1467 dev->dev.type = &iio_device_type;
1468 dev->dev.bus = &iio_bus_type;
1469 device_initialize(&dev->dev);
1470 dev_set_drvdata(&dev->dev, (void *)dev);
1471 mutex_init(&dev->mlock);
1472 mutex_init(&dev->info_exist_lock);
1473 INIT_LIST_HEAD(&dev->channel_attr_list);
1474
1475 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1476 if (dev->id < 0) {
1477 /* cannot use a dev_err as the name isn't available */
1478 pr_err("failed to get device id\n");
1479 kfree(dev);
1480 return NULL;
1481 }
1482 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1483 INIT_LIST_HEAD(&dev->buffer_list);
1484 }
1485
1486 return dev;
1487 }
1488 EXPORT_SYMBOL(iio_device_alloc);
1489
1490 /**
1491 * iio_device_free() - free an iio_dev from a driver
1492 * @dev: the iio_dev associated with the device
1493 **/
1494 void iio_device_free(struct iio_dev *dev)
1495 {
1496 if (dev)
1497 put_device(&dev->dev);
1498 }
1499 EXPORT_SYMBOL(iio_device_free);
1500
1501 static void devm_iio_device_release(struct device *dev, void *res)
1502 {
1503 iio_device_free(*(struct iio_dev **)res);
1504 }
1505
1506 int devm_iio_device_match(struct device *dev, void *res, void *data)
1507 {
1508 struct iio_dev **r = res;
1509 if (!r || !*r) {
1510 WARN_ON(!r || !*r);
1511 return 0;
1512 }
1513 return *r == data;
1514 }
1515 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1516
1517 /**
1518 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1519 * @dev: Device to allocate iio_dev for
1520 * @sizeof_priv: Space to allocate for private structure.
1521 *
1522 * Managed iio_device_alloc. iio_dev allocated with this function is
1523 * automatically freed on driver detach.
1524 *
1525 * If an iio_dev allocated with this function needs to be freed separately,
1526 * devm_iio_device_free() must be used.
1527 *
1528 * RETURNS:
1529 * Pointer to allocated iio_dev on success, NULL on failure.
1530 */
1531 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1532 {
1533 struct iio_dev **ptr, *iio_dev;
1534
1535 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1536 GFP_KERNEL);
1537 if (!ptr)
1538 return NULL;
1539
1540 iio_dev = iio_device_alloc(sizeof_priv);
1541 if (iio_dev) {
1542 *ptr = iio_dev;
1543 devres_add(dev, ptr);
1544 } else {
1545 devres_free(ptr);
1546 }
1547
1548 return iio_dev;
1549 }
1550 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1551
1552 /**
1553 * devm_iio_device_free - Resource-managed iio_device_free()
1554 * @dev: Device this iio_dev belongs to
1555 * @iio_dev: the iio_dev associated with the device
1556 *
1557 * Free iio_dev allocated with devm_iio_device_alloc().
1558 */
1559 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1560 {
1561 int rc;
1562
1563 rc = devres_release(dev, devm_iio_device_release,
1564 devm_iio_device_match, iio_dev);
1565 WARN_ON(rc);
1566 }
1567 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1568
1569 /**
1570 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1571 * @inode: Inode structure for identifying the device in the file system
1572 * @filp: File structure for iio device used to keep and later access
1573 * private data
1574 *
1575 * Return: 0 on success or -EBUSY if the device is already opened
1576 **/
1577 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1578 {
1579 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1580 struct iio_dev, chrdev);
1581
1582 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1583 return -EBUSY;
1584
1585 iio_device_get(indio_dev);
1586
1587 filp->private_data = indio_dev;
1588
1589 return 0;
1590 }
1591
1592 /**
1593 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1594 * @inode: Inode structure pointer for the char device
1595 * @filp: File structure pointer for the char device
1596 *
1597 * Return: 0 for successful release
1598 */
1599 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1600 {
1601 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1602 struct iio_dev, chrdev);
1603 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1604 iio_device_put(indio_dev);
1605
1606 return 0;
1607 }
1608
1609 /* Somewhat of a cross file organization violation - ioctls here are actually
1610 * event related */
1611 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1612 {
1613 struct iio_dev *indio_dev = filp->private_data;
1614 int __user *ip = (int __user *)arg;
1615 int fd;
1616
1617 if (!indio_dev->info)
1618 return -ENODEV;
1619
1620 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1621 fd = iio_event_getfd(indio_dev);
1622 if (fd < 0)
1623 return fd;
1624 if (copy_to_user(ip, &fd, sizeof(fd)))
1625 return -EFAULT;
1626 return 0;
1627 }
1628 return -EINVAL;
1629 }
1630
1631 static const struct file_operations iio_buffer_fileops = {
1632 .read = iio_buffer_read_first_n_outer_addr,
1633 .release = iio_chrdev_release,
1634 .open = iio_chrdev_open,
1635 .poll = iio_buffer_poll_addr,
1636 .owner = THIS_MODULE,
1637 .llseek = noop_llseek,
1638 .unlocked_ioctl = iio_ioctl,
1639 .compat_ioctl = iio_ioctl,
1640 };
1641
1642 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1643 {
1644 int i, j;
1645 const struct iio_chan_spec *channels = indio_dev->channels;
1646
1647 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1648 return 0;
1649
1650 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1651 if (channels[i].scan_index < 0)
1652 continue;
1653 for (j = i + 1; j < indio_dev->num_channels; j++)
1654 if (channels[i].scan_index == channels[j].scan_index) {
1655 dev_err(&indio_dev->dev,
1656 "Duplicate scan index %d\n",
1657 channels[i].scan_index);
1658 return -EINVAL;
1659 }
1660 }
1661
1662 return 0;
1663 }
1664
1665 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1666
1667 /**
1668 * iio_device_register() - register a device with the IIO subsystem
1669 * @indio_dev: Device structure filled by the device driver
1670 **/
1671 int iio_device_register(struct iio_dev *indio_dev)
1672 {
1673 int ret;
1674
1675 /* If the calling driver did not initialize of_node, do it here */
1676 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1677 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1678
1679 ret = iio_check_unique_scan_index(indio_dev);
1680 if (ret < 0)
1681 return ret;
1682
1683 /* configure elements for the chrdev */
1684 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1685
1686 ret = iio_device_register_debugfs(indio_dev);
1687 if (ret) {
1688 dev_err(indio_dev->dev.parent,
1689 "Failed to register debugfs interfaces\n");
1690 return ret;
1691 }
1692
1693 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1694 if (ret) {
1695 dev_err(indio_dev->dev.parent,
1696 "Failed to create buffer sysfs interfaces\n");
1697 goto error_unreg_debugfs;
1698 }
1699
1700 ret = iio_device_register_sysfs(indio_dev);
1701 if (ret) {
1702 dev_err(indio_dev->dev.parent,
1703 "Failed to register sysfs interfaces\n");
1704 goto error_buffer_free_sysfs;
1705 }
1706 ret = iio_device_register_eventset(indio_dev);
1707 if (ret) {
1708 dev_err(indio_dev->dev.parent,
1709 "Failed to register event set\n");
1710 goto error_free_sysfs;
1711 }
1712 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
1713 iio_device_register_trigger_consumer(indio_dev);
1714
1715 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1716 indio_dev->setup_ops == NULL)
1717 indio_dev->setup_ops = &noop_ring_setup_ops;
1718
1719 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1720 indio_dev->chrdev.owner = indio_dev->info->driver_module;
1721 indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
1722 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
1723 if (ret < 0)
1724 goto error_unreg_eventset;
1725
1726 ret = device_add(&indio_dev->dev);
1727 if (ret < 0)
1728 goto error_cdev_del;
1729
1730 return 0;
1731 error_cdev_del:
1732 cdev_del(&indio_dev->chrdev);
1733 error_unreg_eventset:
1734 iio_device_unregister_eventset(indio_dev);
1735 error_free_sysfs:
1736 iio_device_unregister_sysfs(indio_dev);
1737 error_buffer_free_sysfs:
1738 iio_buffer_free_sysfs_and_mask(indio_dev);
1739 error_unreg_debugfs:
1740 iio_device_unregister_debugfs(indio_dev);
1741 return ret;
1742 }
1743 EXPORT_SYMBOL(iio_device_register);
1744
1745 /**
1746 * iio_device_unregister() - unregister a device from the IIO subsystem
1747 * @indio_dev: Device structure representing the device.
1748 **/
1749 void iio_device_unregister(struct iio_dev *indio_dev)
1750 {
1751 mutex_lock(&indio_dev->info_exist_lock);
1752
1753 device_del(&indio_dev->dev);
1754
1755 if (indio_dev->chrdev.dev)
1756 cdev_del(&indio_dev->chrdev);
1757 iio_device_unregister_debugfs(indio_dev);
1758
1759 iio_disable_all_buffers(indio_dev);
1760
1761 indio_dev->info = NULL;
1762
1763 iio_device_wakeup_eventset(indio_dev);
1764 iio_buffer_wakeup_poll(indio_dev);
1765
1766 mutex_unlock(&indio_dev->info_exist_lock);
1767
1768 iio_buffer_free_sysfs_and_mask(indio_dev);
1769 }
1770 EXPORT_SYMBOL(iio_device_unregister);
1771
1772 static void devm_iio_device_unreg(struct device *dev, void *res)
1773 {
1774 iio_device_unregister(*(struct iio_dev **)res);
1775 }
1776
1777 /**
1778 * devm_iio_device_register - Resource-managed iio_device_register()
1779 * @dev: Device to allocate iio_dev for
1780 * @indio_dev: Device structure filled by the device driver
1781 *
1782 * Managed iio_device_register. The IIO device registered with this
1783 * function is automatically unregistered on driver detach. This function
1784 * calls iio_device_register() internally. Refer to that function for more
1785 * information.
1786 *
1787 * If an iio_dev registered with this function needs to be unregistered
1788 * separately, devm_iio_device_unregister() must be used.
1789 *
1790 * RETURNS:
1791 * 0 on success, negative error number on failure.
1792 */
1793 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
1794 {
1795 struct iio_dev **ptr;
1796 int ret;
1797
1798 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1799 if (!ptr)
1800 return -ENOMEM;
1801
1802 *ptr = indio_dev;
1803 ret = iio_device_register(indio_dev);
1804 if (!ret)
1805 devres_add(dev, ptr);
1806 else
1807 devres_free(ptr);
1808
1809 return ret;
1810 }
1811 EXPORT_SYMBOL_GPL(devm_iio_device_register);
1812
1813 /**
1814 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1815 * @dev: Device this iio_dev belongs to
1816 * @indio_dev: the iio_dev associated with the device
1817 *
1818 * Unregister iio_dev registered with devm_iio_device_register().
1819 */
1820 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1821 {
1822 int rc;
1823
1824 rc = devres_release(dev, devm_iio_device_unreg,
1825 devm_iio_device_match, indio_dev);
1826 WARN_ON(rc);
1827 }
1828 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1829
1830 /**
1831 * iio_device_claim_direct_mode - Keep device in direct mode
1832 * @indio_dev: the iio_dev associated with the device
1833 *
1834 * If the device is in direct mode it is guaranteed to stay
1835 * that way until iio_device_release_direct_mode() is called.
1836 *
1837 * Use with iio_device_release_direct_mode()
1838 *
1839 * Returns: 0 on success, -EBUSY on failure
1840 */
1841 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1842 {
1843 mutex_lock(&indio_dev->mlock);
1844
1845 if (iio_buffer_enabled(indio_dev)) {
1846 mutex_unlock(&indio_dev->mlock);
1847 return -EBUSY;
1848 }
1849 return 0;
1850 }
1851 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1852
1853 /**
1854 * iio_device_release_direct_mode - releases claim on direct mode
1855 * @indio_dev: the iio_dev associated with the device
1856 *
1857 * Release the claim. Device is no longer guaranteed to stay
1858 * in direct mode.
1859 *
1860 * Use with iio_device_claim_direct_mode()
1861 */
1862 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1863 {
1864 mutex_unlock(&indio_dev->mlock);
1865 }
1866 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1867
1868 subsys_initcall(iio_init);
1869 module_exit(iio_exit);
1870
1871 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1872 MODULE_DESCRIPTION("Industrial I/O core");
1873 MODULE_LICENSE("GPL");
Ubuntu Artful kernel mirror