?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/panfrost: Move gpu_{write, read}() macros to panfrost_regs.h
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blobf5a4581302f48413738c11805d7adb41cd44df60
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/property.h>
23 #include <linux/sched.h>
24 #include <linux/wait.h>
25 #include <linux/cdev.h>
26 #include <linux/slab.h>
27 #include <linux/anon_inodes.h>
28 #include <linux/debugfs.h>
29 #include <linux/mutex.h>
30 #include <linux/iio/iio.h>
31 #include "iio_core.h"
32 #include "iio_core_trigger.h"
33 #include <linux/iio/sysfs.h>
34 #include <linux/iio/events.h>
35 #include <linux/iio/buffer.h>
36 #include <linux/iio/buffer_impl.h>
37
38 /* IDA to assign each registered device a unique id */
39 static DEFINE_IDA(iio_ida);
40
41 static dev_t iio_devt;
42
43 #define IIO_DEV_MAX 256
44 struct bus_type iio_bus_type = {
45 .name = "iio",
46 };
47 EXPORT_SYMBOL(iio_bus_type);
48
49 static struct dentry *iio_debugfs_dentry;
50
51 static const char * const iio_direction[] = {
52 [0] = "in",
53 [1] = "out",
54 };
55
56 static const char * const iio_chan_type_name_spec[] = {
57 [IIO_VOLTAGE] = "voltage",
58 [IIO_CURRENT] = "current",
59 [IIO_POWER] = "power",
60 [IIO_ACCEL] = "accel",
61 [IIO_ANGL_VEL] = "anglvel",
62 [IIO_MAGN] = "magn",
63 [IIO_LIGHT] = "illuminance",
64 [IIO_INTENSITY] = "intensity",
65 [IIO_PROXIMITY] = "proximity",
66 [IIO_TEMP] = "temp",
67 [IIO_INCLI] = "incli",
68 [IIO_ROT] = "rot",
69 [IIO_ANGL] = "angl",
70 [IIO_TIMESTAMP] = "timestamp",
71 [IIO_CAPACITANCE] = "capacitance",
72 [IIO_ALTVOLTAGE] = "altvoltage",
73 [IIO_CCT] = "cct",
74 [IIO_PRESSURE] = "pressure",
75 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
76 [IIO_ACTIVITY] = "activity",
77 [IIO_STEPS] = "steps",
78 [IIO_ENERGY] = "energy",
79 [IIO_DISTANCE] = "distance",
80 [IIO_VELOCITY] = "velocity",
81 [IIO_CONCENTRATION] = "concentration",
82 [IIO_RESISTANCE] = "resistance",
83 [IIO_PH] = "ph",
84 [IIO_UVINDEX] = "uvindex",
85 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
86 [IIO_COUNT] = "count",
87 [IIO_INDEX] = "index",
88 [IIO_GRAVITY] = "gravity",
89 [IIO_POSITIONRELATIVE] = "positionrelative",
90 [IIO_PHASE] = "phase",
91 [IIO_MASSCONCENTRATION] = "massconcentration",
92 };
93
94 static const char * const iio_modifier_names[] = {
95 [IIO_MOD_X] = "x",
96 [IIO_MOD_Y] = "y",
97 [IIO_MOD_Z] = "z",
98 [IIO_MOD_X_AND_Y] = "x&y",
99 [IIO_MOD_X_AND_Z] = "x&z",
100 [IIO_MOD_Y_AND_Z] = "y&z",
101 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
102 [IIO_MOD_X_OR_Y] = "x|y",
103 [IIO_MOD_X_OR_Z] = "x|z",
104 [IIO_MOD_Y_OR_Z] = "y|z",
105 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
106 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
107 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
108 [IIO_MOD_LIGHT_BOTH] = "both",
109 [IIO_MOD_LIGHT_IR] = "ir",
110 [IIO_MOD_LIGHT_CLEAR] = "clear",
111 [IIO_MOD_LIGHT_RED] = "red",
112 [IIO_MOD_LIGHT_GREEN] = "green",
113 [IIO_MOD_LIGHT_BLUE] = "blue",
114 [IIO_MOD_LIGHT_UV] = "uv",
115 [IIO_MOD_LIGHT_DUV] = "duv",
116 [IIO_MOD_QUATERNION] = "quaternion",
117 [IIO_MOD_TEMP_AMBIENT] = "ambient",
118 [IIO_MOD_TEMP_OBJECT] = "object",
119 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
120 [IIO_MOD_NORTH_TRUE] = "from_north_true",
121 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
122 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
123 [IIO_MOD_RUNNING] = "running",
124 [IIO_MOD_JOGGING] = "jogging",
125 [IIO_MOD_WALKING] = "walking",
126 [IIO_MOD_STILL] = "still",
127 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
128 [IIO_MOD_I] = "i",
129 [IIO_MOD_Q] = "q",
130 [IIO_MOD_CO2] = "co2",
131 [IIO_MOD_VOC] = "voc",
132 [IIO_MOD_PM1] = "pm1",
133 [IIO_MOD_PM2P5] = "pm2p5",
134 [IIO_MOD_PM4] = "pm4",
135 [IIO_MOD_PM10] = "pm10",
136 };
137
138 /* relies on pairs of these shared then separate */
139 static const char * const iio_chan_info_postfix[] = {
140 [IIO_CHAN_INFO_RAW] = "raw",
141 [IIO_CHAN_INFO_PROCESSED] = "input",
142 [IIO_CHAN_INFO_SCALE] = "scale",
143 [IIO_CHAN_INFO_OFFSET] = "offset",
144 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
145 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
146 [IIO_CHAN_INFO_PEAK] = "peak_raw",
147 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
148 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
149 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
150 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
151 = "filter_low_pass_3db_frequency",
152 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
153 = "filter_high_pass_3db_frequency",
154 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
155 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
156 [IIO_CHAN_INFO_PHASE] = "phase",
157 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
158 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
159 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
160 [IIO_CHAN_INFO_ENABLE] = "en",
161 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
162 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
163 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
164 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
165 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
166 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
167 };
168
169 /**
170 * iio_find_channel_from_si() - get channel from its scan index
171 * @indio_dev: device
172 * @si: scan index to match
173 */
174 const struct iio_chan_spec
175 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
176 {
177 int i;
178
179 for (i = 0; i < indio_dev->num_channels; i++)
180 if (indio_dev->channels[i].scan_index == si)
181 return &indio_dev->channels[i];
182 return NULL;
183 }
184
185 /* This turns up an awful lot */
186 ssize_t iio_read_const_attr(struct device *dev,
187 struct device_attribute *attr,
188 char *buf)
189 {
190 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
191 }
192 EXPORT_SYMBOL(iio_read_const_attr);
193
194 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
195 {
196 int ret;
197 const struct iio_event_interface *ev_int = indio_dev->event_interface;
198
199 ret = mutex_lock_interruptible(&indio_dev->mlock);
200 if (ret)
201 return ret;
202 if ((ev_int && iio_event_enabled(ev_int)) ||
203 iio_buffer_enabled(indio_dev)) {
204 mutex_unlock(&indio_dev->mlock);
205 return -EBUSY;
206 }
207 indio_dev->clock_id = clock_id;
208 mutex_unlock(&indio_dev->mlock);
209
210 return 0;
211 }
212
213 /**
214 * iio_get_time_ns() - utility function to get a time stamp for events etc
215 * @indio_dev: device
216 */
217 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
218 {
219 struct timespec64 tp;
220
221 switch (iio_device_get_clock(indio_dev)) {
222 case CLOCK_REALTIME:
223 return ktime_get_real_ns();
224 case CLOCK_MONOTONIC:
225 return ktime_get_ns();
226 case CLOCK_MONOTONIC_RAW:
227 return ktime_get_raw_ns();
228 case CLOCK_REALTIME_COARSE:
229 return ktime_to_ns(ktime_get_coarse_real());
230 case CLOCK_MONOTONIC_COARSE:
231 ktime_get_coarse_ts64(&tp);
232 return timespec64_to_ns(&tp);
233 case CLOCK_BOOTTIME:
234 return ktime_get_boot_ns();
235 case CLOCK_TAI:
236 return ktime_get_tai_ns();
237 default:
238 BUG();
239 }
240 }
241 EXPORT_SYMBOL(iio_get_time_ns);
242
243 /**
244 * iio_get_time_res() - utility function to get time stamp clock resolution in
245 * nano seconds.
246 * @indio_dev: device
247 */
248 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
249 {
250 switch (iio_device_get_clock(indio_dev)) {
251 case CLOCK_REALTIME:
252 case CLOCK_MONOTONIC:
253 case CLOCK_MONOTONIC_RAW:
254 case CLOCK_BOOTTIME:
255 case CLOCK_TAI:
256 return hrtimer_resolution;
257 case CLOCK_REALTIME_COARSE:
258 case CLOCK_MONOTONIC_COARSE:
259 return LOW_RES_NSEC;
260 default:
261 BUG();
262 }
263 }
264 EXPORT_SYMBOL(iio_get_time_res);
265
266 static int __init iio_init(void)
267 {
268 int ret;
269
270 /* Register sysfs bus */
271 ret = bus_register(&iio_bus_type);
272 if (ret < 0) {
273 pr_err("could not register bus type\n");
274 goto error_nothing;
275 }
276
277 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
278 if (ret < 0) {
279 pr_err("failed to allocate char dev region\n");
280 goto error_unregister_bus_type;
281 }
282
283 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
284
285 return 0;
286
287 error_unregister_bus_type:
288 bus_unregister(&iio_bus_type);
289 error_nothing:
290 return ret;
291 }
292
293 static void __exit iio_exit(void)
294 {
295 if (iio_devt)
296 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
297 bus_unregister(&iio_bus_type);
298 debugfs_remove(iio_debugfs_dentry);
299 }
300
301 #if defined(CONFIG_DEBUG_FS)
302 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
303 size_t count, loff_t *ppos)
304 {
305 struct iio_dev *indio_dev = file->private_data;
306 char buf[20];
307 unsigned val = 0;
308 ssize_t len;
309 int ret;
310
311 ret = indio_dev->info->debugfs_reg_access(indio_dev,
312 indio_dev->cached_reg_addr,
313 0, &val);
314 if (ret) {
315 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
316 return ret;
317 }
318
319 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
320
321 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
322 }
323
324 static ssize_t iio_debugfs_write_reg(struct file *file,
325 const char __user *userbuf, size_t count, loff_t *ppos)
326 {
327 struct iio_dev *indio_dev = file->private_data;
328 unsigned reg, val;
329 char buf[80];
330 int ret;
331
332 count = min_t(size_t, count, (sizeof(buf)-1));
333 if (copy_from_user(buf, userbuf, count))
334 return -EFAULT;
335
336 buf[count] = 0;
337
338 ret = sscanf(buf, "%i %i", &reg, &val);
339
340 switch (ret) {
341 case 1:
342 indio_dev->cached_reg_addr = reg;
343 break;
344 case 2:
345 indio_dev->cached_reg_addr = reg;
346 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
347 val, NULL);
348 if (ret) {
349 dev_err(indio_dev->dev.parent, "%s: write failed\n",
350 __func__);
351 return ret;
352 }
353 break;
354 default:
355 return -EINVAL;
356 }
357
358 return count;
359 }
360
361 static const struct file_operations iio_debugfs_reg_fops = {
362 .open = simple_open,
363 .read = iio_debugfs_read_reg,
364 .write = iio_debugfs_write_reg,
365 };
366
367 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
368 {
369 debugfs_remove_recursive(indio_dev->debugfs_dentry);
370 }
371
372 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
373 {
374 struct dentry *d;
375
376 if (indio_dev->info->debugfs_reg_access == NULL)
377 return 0;
378
379 if (!iio_debugfs_dentry)
380 return 0;
381
382 indio_dev->debugfs_dentry =
383 debugfs_create_dir(dev_name(&indio_dev->dev),
384 iio_debugfs_dentry);
385 if (indio_dev->debugfs_dentry == NULL) {
386 dev_warn(indio_dev->dev.parent,
387 "Failed to create debugfs directory\n");
388 return -EFAULT;
389 }
390
391 d = debugfs_create_file("direct_reg_access", 0644,
392 indio_dev->debugfs_dentry,
393 indio_dev, &iio_debugfs_reg_fops);
394 if (!d) {
395 iio_device_unregister_debugfs(indio_dev);
396 return -ENOMEM;
397 }
398
399 return 0;
400 }
401 #else
402 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
403 {
404 return 0;
405 }
406
407 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
408 {
409 }
410 #endif /* CONFIG_DEBUG_FS */
411
412 static ssize_t iio_read_channel_ext_info(struct device *dev,
413 struct device_attribute *attr,
414 char *buf)
415 {
416 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
417 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
418 const struct iio_chan_spec_ext_info *ext_info;
419
420 ext_info = &this_attr->c->ext_info[this_attr->address];
421
422 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
423 }
424
425 static ssize_t iio_write_channel_ext_info(struct device *dev,
426 struct device_attribute *attr,
427 const char *buf,
428 size_t len)
429 {
430 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
431 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
432 const struct iio_chan_spec_ext_info *ext_info;
433
434 ext_info = &this_attr->c->ext_info[this_attr->address];
435
436 return ext_info->write(indio_dev, ext_info->private,
437 this_attr->c, buf, len);
438 }
439
440 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
441 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
442 {
443 const struct iio_enum *e = (const struct iio_enum *)priv;
444 unsigned int i;
445 size_t len = 0;
446
447 if (!e->num_items)
448 return 0;
449
450 for (i = 0; i < e->num_items; ++i)
451 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
452
453 /* replace last space with a newline */
454 buf[len - 1] = '\n';
455
456 return len;
457 }
458 EXPORT_SYMBOL_GPL(iio_enum_available_read);
459
460 ssize_t iio_enum_read(struct iio_dev *indio_dev,
461 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
462 {
463 const struct iio_enum *e = (const struct iio_enum *)priv;
464 int i;
465
466 if (!e->get)
467 return -EINVAL;
468
469 i = e->get(indio_dev, chan);
470 if (i < 0)
471 return i;
472 else if (i >= e->num_items)
473 return -EINVAL;
474
475 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
476 }
477 EXPORT_SYMBOL_GPL(iio_enum_read);
478
479 ssize_t iio_enum_write(struct iio_dev *indio_dev,
480 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
481 size_t len)
482 {
483 const struct iio_enum *e = (const struct iio_enum *)priv;
484 int ret;
485
486 if (!e->set)
487 return -EINVAL;
488
489 ret = __sysfs_match_string(e->items, e->num_items, buf);
490 if (ret < 0)
491 return ret;
492
493 ret = e->set(indio_dev, chan, ret);
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 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
535 * device "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 int iio_read_mount_matrix(struct device *dev, const char *propname,
546 struct iio_mount_matrix *matrix)
547 {
548 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
549 int err;
550
551 err = device_property_read_string_array(dev, propname,
552 matrix->rotation, len);
553 if (err == len)
554 return 0;
555
556 if (err >= 0)
557 /* Invalid number of matrix entries. */
558 return -EINVAL;
559
560 if (err != -EINVAL)
561 /* Invalid matrix declaration format. */
562 return err;
563
564 /* Matrix was not declared at all: fallback to identity. */
565 return iio_setup_mount_idmatrix(dev, matrix);
566 }
567 EXPORT_SYMBOL(iio_read_mount_matrix);
568
569 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
570 int size, const int *vals)
571 {
572 unsigned long long tmp;
573 int tmp0, tmp1;
574 bool scale_db = false;
575
576 switch (type) {
577 case IIO_VAL_INT:
578 return snprintf(buf, len, "%d", vals[0]);
579 case IIO_VAL_INT_PLUS_MICRO_DB:
580 scale_db = true;
581 /* fall through */
582 case IIO_VAL_INT_PLUS_MICRO:
583 if (vals[1] < 0)
584 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
585 -vals[1], scale_db ? " dB" : "");
586 else
587 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
588 scale_db ? " dB" : "");
589 case IIO_VAL_INT_PLUS_NANO:
590 if (vals[1] < 0)
591 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
592 -vals[1]);
593 else
594 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
595 case IIO_VAL_FRACTIONAL:
596 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
597 tmp1 = vals[1];
598 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
599 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
600 case IIO_VAL_FRACTIONAL_LOG2:
601 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
602 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
603 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
604 case IIO_VAL_INT_MULTIPLE:
605 {
606 int i;
607 int l = 0;
608
609 for (i = 0; i < size; ++i) {
610 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
611 if (l >= len)
612 break;
613 }
614 return l;
615 }
616 default:
617 return 0;
618 }
619 }
620
621 /**
622 * iio_format_value() - Formats a IIO value into its string representation
623 * @buf: The buffer to which the formatted value gets written
624 * which is assumed to be big enough (i.e. PAGE_SIZE).
625 * @type: One of the IIO_VAL_* constants. This decides how the val
626 * and val2 parameters are formatted.
627 * @size: Number of IIO value entries contained in vals
628 * @vals: Pointer to the values, exact meaning depends on the
629 * type parameter.
630 *
631 * Return: 0 by default, a negative number on failure or the
632 * total number of characters written for a type that belongs
633 * to the IIO_VAL_* constant.
634 */
635 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
636 {
637 ssize_t len;
638
639 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
640 if (len >= PAGE_SIZE - 1)
641 return -EFBIG;
642
643 return len + sprintf(buf + len, "\n");
644 }
645 EXPORT_SYMBOL_GPL(iio_format_value);
646
647 static ssize_t iio_read_channel_info(struct device *dev,
648 struct device_attribute *attr,
649 char *buf)
650 {
651 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
652 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
653 int vals[INDIO_MAX_RAW_ELEMENTS];
654 int ret;
655 int val_len = 2;
656
657 if (indio_dev->info->read_raw_multi)
658 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
659 INDIO_MAX_RAW_ELEMENTS,
660 vals, &val_len,
661 this_attr->address);
662 else
663 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
664 &vals[0], &vals[1], this_attr->address);
665
666 if (ret < 0)
667 return ret;
668
669 return iio_format_value(buf, ret, val_len, vals);
670 }
671
672 static ssize_t iio_format_avail_list(char *buf, const int *vals,
673 int type, int length)
674 {
675 int i;
676 ssize_t len = 0;
677
678 switch (type) {
679 case IIO_VAL_INT:
680 for (i = 0; i < length; i++) {
681 len += __iio_format_value(buf + len, PAGE_SIZE - len,
682 type, 1, &vals[i]);
683 if (len >= PAGE_SIZE)
684 return -EFBIG;
685 if (i < length - 1)
686 len += snprintf(buf + len, PAGE_SIZE - len,
687 " ");
688 else
689 len += snprintf(buf + len, PAGE_SIZE - len,
690 "\n");
691 if (len >= PAGE_SIZE)
692 return -EFBIG;
693 }
694 break;
695 default:
696 for (i = 0; i < length / 2; i++) {
697 len += __iio_format_value(buf + len, PAGE_SIZE - len,
698 type, 2, &vals[i * 2]);
699 if (len >= PAGE_SIZE)
700 return -EFBIG;
701 if (i < length / 2 - 1)
702 len += snprintf(buf + len, PAGE_SIZE - len,
703 " ");
704 else
705 len += snprintf(buf + len, PAGE_SIZE - len,
706 "\n");
707 if (len >= PAGE_SIZE)
708 return -EFBIG;
709 }
710 }
711
712 return len;
713 }
714
715 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
716 {
717 int i;
718 ssize_t len;
719
720 len = snprintf(buf, PAGE_SIZE, "[");
721 switch (type) {
722 case IIO_VAL_INT:
723 for (i = 0; i < 3; i++) {
724 len += __iio_format_value(buf + len, PAGE_SIZE - len,
725 type, 1, &vals[i]);
726 if (len >= PAGE_SIZE)
727 return -EFBIG;
728 if (i < 2)
729 len += snprintf(buf + len, PAGE_SIZE - len,
730 " ");
731 else
732 len += snprintf(buf + len, PAGE_SIZE - len,
733 "]\n");
734 if (len >= PAGE_SIZE)
735 return -EFBIG;
736 }
737 break;
738 default:
739 for (i = 0; i < 3; i++) {
740 len += __iio_format_value(buf + len, PAGE_SIZE - len,
741 type, 2, &vals[i * 2]);
742 if (len >= PAGE_SIZE)
743 return -EFBIG;
744 if (i < 2)
745 len += snprintf(buf + len, PAGE_SIZE - len,
746 " ");
747 else
748 len += snprintf(buf + len, PAGE_SIZE - len,
749 "]\n");
750 if (len >= PAGE_SIZE)
751 return -EFBIG;
752 }
753 }
754
755 return len;
756 }
757
758 static ssize_t iio_read_channel_info_avail(struct device *dev,
759 struct device_attribute *attr,
760 char *buf)
761 {
762 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
763 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
764 const int *vals;
765 int ret;
766 int length;
767 int type;
768
769 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
770 &vals, &type, &length,
771 this_attr->address);
772
773 if (ret < 0)
774 return ret;
775 switch (ret) {
776 case IIO_AVAIL_LIST:
777 return iio_format_avail_list(buf, vals, type, length);
778 case IIO_AVAIL_RANGE:
779 return iio_format_avail_range(buf, vals, type);
780 default:
781 return -EINVAL;
782 }
783 }
784
785 /**
786 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
787 * @str: The string to parse
788 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
789 * @integer: The integer part of the number
790 * @fract: The fractional part of the number
791 *
792 * Returns 0 on success, or a negative error code if the string could not be
793 * parsed.
794 */
795 int iio_str_to_fixpoint(const char *str, int fract_mult,
796 int *integer, int *fract)
797 {
798 int i = 0, f = 0;
799 bool integer_part = true, negative = false;
800
801 if (fract_mult == 0) {
802 *fract = 0;
803
804 return kstrtoint(str, 0, integer);
805 }
806
807 if (str[0] == '-') {
808 negative = true;
809 str++;
810 } else if (str[0] == '+') {
811 str++;
812 }
813
814 while (*str) {
815 if ('0' <= *str && *str <= '9') {
816 if (integer_part) {
817 i = i * 10 + *str - '0';
818 } else {
819 f += fract_mult * (*str - '0');
820 fract_mult /= 10;
821 }
822 } else if (*str == '\n') {
823 if (*(str + 1) == '\0')
824 break;
825 else
826 return -EINVAL;
827 } else if (*str == '.' && integer_part) {
828 integer_part = false;
829 } else {
830 return -EINVAL;
831 }
832 str++;
833 }
834
835 if (negative) {
836 if (i)
837 i = -i;
838 else
839 f = -f;
840 }
841
842 *integer = i;
843 *fract = f;
844
845 return 0;
846 }
847 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
848
849 static ssize_t iio_write_channel_info(struct device *dev,
850 struct device_attribute *attr,
851 const char *buf,
852 size_t len)
853 {
854 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
855 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
856 int ret, fract_mult = 100000;
857 int integer, fract;
858
859 /* Assumes decimal - precision based on number of digits */
860 if (!indio_dev->info->write_raw)
861 return -EINVAL;
862
863 if (indio_dev->info->write_raw_get_fmt)
864 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
865 this_attr->c, this_attr->address)) {
866 case IIO_VAL_INT:
867 fract_mult = 0;
868 break;
869 case IIO_VAL_INT_PLUS_MICRO:
870 fract_mult = 100000;
871 break;
872 case IIO_VAL_INT_PLUS_NANO:
873 fract_mult = 100000000;
874 break;
875 default:
876 return -EINVAL;
877 }
878
879 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
880 if (ret)
881 return ret;
882
883 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
884 integer, fract, this_attr->address);
885 if (ret)
886 return ret;
887
888 return len;
889 }
890
891 static
892 int __iio_device_attr_init(struct device_attribute *dev_attr,
893 const char *postfix,
894 struct iio_chan_spec const *chan,
895 ssize_t (*readfunc)(struct device *dev,
896 struct device_attribute *attr,
897 char *buf),
898 ssize_t (*writefunc)(struct device *dev,
899 struct device_attribute *attr,
900 const char *buf,
901 size_t len),
902 enum iio_shared_by shared_by)
903 {
904 int ret = 0;
905 char *name = NULL;
906 char *full_postfix;
907 sysfs_attr_init(&dev_attr->attr);
908
909 /* Build up postfix of <extend_name>_<modifier>_postfix */
910 if (chan->modified && (shared_by == IIO_SEPARATE)) {
911 if (chan->extend_name)
912 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
913 iio_modifier_names[chan
914 ->channel2],
915 chan->extend_name,
916 postfix);
917 else
918 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
919 iio_modifier_names[chan
920 ->channel2],
921 postfix);
922 } else {
923 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
924 full_postfix = kstrdup(postfix, GFP_KERNEL);
925 else
926 full_postfix = kasprintf(GFP_KERNEL,
927 "%s_%s",
928 chan->extend_name,
929 postfix);
930 }
931 if (full_postfix == NULL)
932 return -ENOMEM;
933
934 if (chan->differential) { /* Differential can not have modifier */
935 switch (shared_by) {
936 case IIO_SHARED_BY_ALL:
937 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
938 break;
939 case IIO_SHARED_BY_DIR:
940 name = kasprintf(GFP_KERNEL, "%s_%s",
941 iio_direction[chan->output],
942 full_postfix);
943 break;
944 case IIO_SHARED_BY_TYPE:
945 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
946 iio_direction[chan->output],
947 iio_chan_type_name_spec[chan->type],
948 iio_chan_type_name_spec[chan->type],
949 full_postfix);
950 break;
951 case IIO_SEPARATE:
952 if (!chan->indexed) {
953 WARN(1, "Differential channels must be indexed\n");
954 ret = -EINVAL;
955 goto error_free_full_postfix;
956 }
957 name = kasprintf(GFP_KERNEL,
958 "%s_%s%d-%s%d_%s",
959 iio_direction[chan->output],
960 iio_chan_type_name_spec[chan->type],
961 chan->channel,
962 iio_chan_type_name_spec[chan->type],
963 chan->channel2,
964 full_postfix);
965 break;
966 }
967 } else { /* Single ended */
968 switch (shared_by) {
969 case IIO_SHARED_BY_ALL:
970 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
971 break;
972 case IIO_SHARED_BY_DIR:
973 name = kasprintf(GFP_KERNEL, "%s_%s",
974 iio_direction[chan->output],
975 full_postfix);
976 break;
977 case IIO_SHARED_BY_TYPE:
978 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
979 iio_direction[chan->output],
980 iio_chan_type_name_spec[chan->type],
981 full_postfix);
982 break;
983
984 case IIO_SEPARATE:
985 if (chan->indexed)
986 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
987 iio_direction[chan->output],
988 iio_chan_type_name_spec[chan->type],
989 chan->channel,
990 full_postfix);
991 else
992 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
993 iio_direction[chan->output],
994 iio_chan_type_name_spec[chan->type],
995 full_postfix);
996 break;
997 }
998 }
999 if (name == NULL) {
1000 ret = -ENOMEM;
1001 goto error_free_full_postfix;
1002 }
1003 dev_attr->attr.name = name;
1004
1005 if (readfunc) {
1006 dev_attr->attr.mode |= S_IRUGO;
1007 dev_attr->show = readfunc;
1008 }
1009
1010 if (writefunc) {
1011 dev_attr->attr.mode |= S_IWUSR;
1012 dev_attr->store = writefunc;
1013 }
1014
1015 error_free_full_postfix:
1016 kfree(full_postfix);
1017
1018 return ret;
1019 }
1020
1021 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1022 {
1023 kfree(dev_attr->attr.name);
1024 }
1025
1026 int __iio_add_chan_devattr(const char *postfix,
1027 struct iio_chan_spec const *chan,
1028 ssize_t (*readfunc)(struct device *dev,
1029 struct device_attribute *attr,
1030 char *buf),
1031 ssize_t (*writefunc)(struct device *dev,
1032 struct device_attribute *attr,
1033 const char *buf,
1034 size_t len),
1035 u64 mask,
1036 enum iio_shared_by shared_by,
1037 struct device *dev,
1038 struct list_head *attr_list)
1039 {
1040 int ret;
1041 struct iio_dev_attr *iio_attr, *t;
1042
1043 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1044 if (iio_attr == NULL)
1045 return -ENOMEM;
1046 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1047 postfix, chan,
1048 readfunc, writefunc, shared_by);
1049 if (ret)
1050 goto error_iio_dev_attr_free;
1051 iio_attr->c = chan;
1052 iio_attr->address = mask;
1053 list_for_each_entry(t, attr_list, l)
1054 if (strcmp(t->dev_attr.attr.name,
1055 iio_attr->dev_attr.attr.name) == 0) {
1056 if (shared_by == IIO_SEPARATE)
1057 dev_err(dev, "tried to double register : %s\n",
1058 t->dev_attr.attr.name);
1059 ret = -EBUSY;
1060 goto error_device_attr_deinit;
1061 }
1062 list_add(&iio_attr->l, attr_list);
1063
1064 return 0;
1065
1066 error_device_attr_deinit:
1067 __iio_device_attr_deinit(&iio_attr->dev_attr);
1068 error_iio_dev_attr_free:
1069 kfree(iio_attr);
1070 return ret;
1071 }
1072
1073 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1074 struct iio_chan_spec const *chan,
1075 enum iio_shared_by shared_by,
1076 const long *infomask)
1077 {
1078 int i, ret, attrcount = 0;
1079
1080 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1081 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1082 return -EINVAL;
1083 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1084 chan,
1085 &iio_read_channel_info,
1086 &iio_write_channel_info,
1087 i,
1088 shared_by,
1089 &indio_dev->dev,
1090 &indio_dev->channel_attr_list);
1091 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1092 continue;
1093 else if (ret < 0)
1094 return ret;
1095 attrcount++;
1096 }
1097
1098 return attrcount;
1099 }
1100
1101 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1102 struct iio_chan_spec const *chan,
1103 enum iio_shared_by shared_by,
1104 const long *infomask)
1105 {
1106 int i, ret, attrcount = 0;
1107 char *avail_postfix;
1108
1109 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1110 avail_postfix = kasprintf(GFP_KERNEL,
1111 "%s_available",
1112 iio_chan_info_postfix[i]);
1113 if (!avail_postfix)
1114 return -ENOMEM;
1115
1116 ret = __iio_add_chan_devattr(avail_postfix,
1117 chan,
1118 &iio_read_channel_info_avail,
1119 NULL,
1120 i,
1121 shared_by,
1122 &indio_dev->dev,
1123 &indio_dev->channel_attr_list);
1124 kfree(avail_postfix);
1125 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1126 continue;
1127 else if (ret < 0)
1128 return ret;
1129 attrcount++;
1130 }
1131
1132 return attrcount;
1133 }
1134
1135 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1136 struct iio_chan_spec const *chan)
1137 {
1138 int ret, attrcount = 0;
1139 const struct iio_chan_spec_ext_info *ext_info;
1140
1141 if (chan->channel < 0)
1142 return 0;
1143 ret = iio_device_add_info_mask_type(indio_dev, chan,
1144 IIO_SEPARATE,
1145 &chan->info_mask_separate);
1146 if (ret < 0)
1147 return ret;
1148 attrcount += ret;
1149
1150 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1151 IIO_SEPARATE,
1152 &chan->
1153 info_mask_separate_available);
1154 if (ret < 0)
1155 return ret;
1156 attrcount += ret;
1157
1158 ret = iio_device_add_info_mask_type(indio_dev, chan,
1159 IIO_SHARED_BY_TYPE,
1160 &chan->info_mask_shared_by_type);
1161 if (ret < 0)
1162 return ret;
1163 attrcount += ret;
1164
1165 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1166 IIO_SHARED_BY_TYPE,
1167 &chan->
1168 info_mask_shared_by_type_available);
1169 if (ret < 0)
1170 return ret;
1171 attrcount += ret;
1172
1173 ret = iio_device_add_info_mask_type(indio_dev, chan,
1174 IIO_SHARED_BY_DIR,
1175 &chan->info_mask_shared_by_dir);
1176 if (ret < 0)
1177 return ret;
1178 attrcount += ret;
1179
1180 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1181 IIO_SHARED_BY_DIR,
1182 &chan->info_mask_shared_by_dir_available);
1183 if (ret < 0)
1184 return ret;
1185 attrcount += ret;
1186
1187 ret = iio_device_add_info_mask_type(indio_dev, chan,
1188 IIO_SHARED_BY_ALL,
1189 &chan->info_mask_shared_by_all);
1190 if (ret < 0)
1191 return ret;
1192 attrcount += ret;
1193
1194 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1195 IIO_SHARED_BY_ALL,
1196 &chan->info_mask_shared_by_all_available);
1197 if (ret < 0)
1198 return ret;
1199 attrcount += ret;
1200
1201 if (chan->ext_info) {
1202 unsigned int i = 0;
1203 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1204 ret = __iio_add_chan_devattr(ext_info->name,
1205 chan,
1206 ext_info->read ?
1207 &iio_read_channel_ext_info : NULL,
1208 ext_info->write ?
1209 &iio_write_channel_ext_info : NULL,
1210 i,
1211 ext_info->shared,
1212 &indio_dev->dev,
1213 &indio_dev->channel_attr_list);
1214 i++;
1215 if (ret == -EBUSY && ext_info->shared)
1216 continue;
1217
1218 if (ret)
1219 return ret;
1220
1221 attrcount++;
1222 }
1223 }
1224
1225 return attrcount;
1226 }
1227
1228 /**
1229 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1230 * @attr_list: List of IIO device attributes
1231 *
1232 * This function frees the memory allocated for each of the IIO device
1233 * attributes in the list.
1234 */
1235 void iio_free_chan_devattr_list(struct list_head *attr_list)
1236 {
1237 struct iio_dev_attr *p, *n;
1238
1239 list_for_each_entry_safe(p, n, attr_list, l) {
1240 kfree(p->dev_attr.attr.name);
1241 list_del(&p->l);
1242 kfree(p);
1243 }
1244 }
1245
1246 static ssize_t iio_show_dev_name(struct device *dev,
1247 struct device_attribute *attr,
1248 char *buf)
1249 {
1250 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1251 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1252 }
1253
1254 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1255
1256 static ssize_t iio_show_timestamp_clock(struct device *dev,
1257 struct device_attribute *attr,
1258 char *buf)
1259 {
1260 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1261 const clockid_t clk = iio_device_get_clock(indio_dev);
1262 const char *name;
1263 ssize_t sz;
1264
1265 switch (clk) {
1266 case CLOCK_REALTIME:
1267 name = "realtime\n";
1268 sz = sizeof("realtime\n");
1269 break;
1270 case CLOCK_MONOTONIC:
1271 name = "monotonic\n";
1272 sz = sizeof("monotonic\n");
1273 break;
1274 case CLOCK_MONOTONIC_RAW:
1275 name = "monotonic_raw\n";
1276 sz = sizeof("monotonic_raw\n");
1277 break;
1278 case CLOCK_REALTIME_COARSE:
1279 name = "realtime_coarse\n";
1280 sz = sizeof("realtime_coarse\n");
1281 break;
1282 case CLOCK_MONOTONIC_COARSE:
1283 name = "monotonic_coarse\n";
1284 sz = sizeof("monotonic_coarse\n");
1285 break;
1286 case CLOCK_BOOTTIME:
1287 name = "boottime\n";
1288 sz = sizeof("boottime\n");
1289 break;
1290 case CLOCK_TAI:
1291 name = "tai\n";
1292 sz = sizeof("tai\n");
1293 break;
1294 default:
1295 BUG();
1296 }
1297
1298 memcpy(buf, name, sz);
1299 return sz;
1300 }
1301
1302 static ssize_t iio_store_timestamp_clock(struct device *dev,
1303 struct device_attribute *attr,
1304 const char *buf, size_t len)
1305 {
1306 clockid_t clk;
1307 int ret;
1308
1309 if (sysfs_streq(buf, "realtime"))
1310 clk = CLOCK_REALTIME;
1311 else if (sysfs_streq(buf, "monotonic"))
1312 clk = CLOCK_MONOTONIC;
1313 else if (sysfs_streq(buf, "monotonic_raw"))
1314 clk = CLOCK_MONOTONIC_RAW;
1315 else if (sysfs_streq(buf, "realtime_coarse"))
1316 clk = CLOCK_REALTIME_COARSE;
1317 else if (sysfs_streq(buf, "monotonic_coarse"))
1318 clk = CLOCK_MONOTONIC_COARSE;
1319 else if (sysfs_streq(buf, "boottime"))
1320 clk = CLOCK_BOOTTIME;
1321 else if (sysfs_streq(buf, "tai"))
1322 clk = CLOCK_TAI;
1323 else
1324 return -EINVAL;
1325
1326 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1327 if (ret)
1328 return ret;
1329
1330 return len;
1331 }
1332
1333 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1334 iio_show_timestamp_clock, iio_store_timestamp_clock);
1335
1336 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1337 {
1338 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1339 struct iio_dev_attr *p;
1340 struct attribute **attr, *clk = NULL;
1341
1342 /* First count elements in any existing group */
1343 if (indio_dev->info->attrs) {
1344 attr = indio_dev->info->attrs->attrs;
1345 while (*attr++ != NULL)
1346 attrcount_orig++;
1347 }
1348 attrcount = attrcount_orig;
1349 /*
1350 * New channel registration method - relies on the fact a group does
1351 * not need to be initialized if its name is NULL.
1352 */
1353 if (indio_dev->channels)
1354 for (i = 0; i < indio_dev->num_channels; i++) {
1355 const struct iio_chan_spec *chan =
1356 &indio_dev->channels[i];
1357
1358 if (chan->type == IIO_TIMESTAMP)
1359 clk = &dev_attr_current_timestamp_clock.attr;
1360
1361 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1362 if (ret < 0)
1363 goto error_clear_attrs;
1364 attrcount += ret;
1365 }
1366
1367 if (indio_dev->event_interface)
1368 clk = &dev_attr_current_timestamp_clock.attr;
1369
1370 if (indio_dev->name)
1371 attrcount++;
1372 if (clk)
1373 attrcount++;
1374
1375 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1376 sizeof(indio_dev->chan_attr_group.attrs[0]),
1377 GFP_KERNEL);
1378 if (indio_dev->chan_attr_group.attrs == NULL) {
1379 ret = -ENOMEM;
1380 goto error_clear_attrs;
1381 }
1382 /* Copy across original attributes */
1383 if (indio_dev->info->attrs)
1384 memcpy(indio_dev->chan_attr_group.attrs,
1385 indio_dev->info->attrs->attrs,
1386 sizeof(indio_dev->chan_attr_group.attrs[0])
1387 *attrcount_orig);
1388 attrn = attrcount_orig;
1389 /* Add all elements from the list. */
1390 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1391 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1392 if (indio_dev->name)
1393 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1394 if (clk)
1395 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1396
1397 indio_dev->groups[indio_dev->groupcounter++] =
1398 &indio_dev->chan_attr_group;
1399
1400 return 0;
1401
1402 error_clear_attrs:
1403 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1404
1405 return ret;
1406 }
1407
1408 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1409 {
1410
1411 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1412 kfree(indio_dev->chan_attr_group.attrs);
1413 indio_dev->chan_attr_group.attrs = NULL;
1414 }
1415
1416 static void iio_dev_release(struct device *device)
1417 {
1418 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1419 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1420 iio_device_unregister_trigger_consumer(indio_dev);
1421 iio_device_unregister_eventset(indio_dev);
1422 iio_device_unregister_sysfs(indio_dev);
1423
1424 iio_buffer_put(indio_dev->buffer);
1425
1426 ida_simple_remove(&iio_ida, indio_dev->id);
1427 kfree(indio_dev);
1428 }
1429
1430 struct device_type iio_device_type = {
1431 .name = "iio_device",
1432 .release = iio_dev_release,
1433 };
1434
1435 /**
1436 * iio_device_alloc() - allocate an iio_dev from a driver
1437 * @sizeof_priv: Space to allocate for private structure.
1438 **/
1439 struct iio_dev *iio_device_alloc(int sizeof_priv)
1440 {
1441 struct iio_dev *dev;
1442 size_t alloc_size;
1443
1444 alloc_size = sizeof(struct iio_dev);
1445 if (sizeof_priv) {
1446 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1447 alloc_size += sizeof_priv;
1448 }
1449 /* ensure 32-byte alignment of whole construct ? */
1450 alloc_size += IIO_ALIGN - 1;
1451
1452 dev = kzalloc(alloc_size, GFP_KERNEL);
1453
1454 if (dev) {
1455 dev->dev.groups = dev->groups;
1456 dev->dev.type = &iio_device_type;
1457 dev->dev.bus = &iio_bus_type;
1458 device_initialize(&dev->dev);
1459 dev_set_drvdata(&dev->dev, (void *)dev);
1460 mutex_init(&dev->mlock);
1461 mutex_init(&dev->info_exist_lock);
1462 INIT_LIST_HEAD(&dev->channel_attr_list);
1463
1464 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1465 if (dev->id < 0) {
1466 /* cannot use a dev_err as the name isn't available */
1467 pr_err("failed to get device id\n");
1468 kfree(dev);
1469 return NULL;
1470 }
1471 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1472 INIT_LIST_HEAD(&dev->buffer_list);
1473 }
1474
1475 return dev;
1476 }
1477 EXPORT_SYMBOL(iio_device_alloc);
1478
1479 /**
1480 * iio_device_free() - free an iio_dev from a driver
1481 * @dev: the iio_dev associated with the device
1482 **/
1483 void iio_device_free(struct iio_dev *dev)
1484 {
1485 if (dev)
1486 put_device(&dev->dev);
1487 }
1488 EXPORT_SYMBOL(iio_device_free);
1489
1490 static void devm_iio_device_release(struct device *dev, void *res)
1491 {
1492 iio_device_free(*(struct iio_dev **)res);
1493 }
1494
1495 int devm_iio_device_match(struct device *dev, void *res, void *data)
1496 {
1497 struct iio_dev **r = res;
1498 if (!r || !*r) {
1499 WARN_ON(!r || !*r);
1500 return 0;
1501 }
1502 return *r == data;
1503 }
1504 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1505
1506 /**
1507 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1508 * @dev: Device to allocate iio_dev for
1509 * @sizeof_priv: Space to allocate for private structure.
1510 *
1511 * Managed iio_device_alloc. iio_dev allocated with this function is
1512 * automatically freed on driver detach.
1513 *
1514 * If an iio_dev allocated with this function needs to be freed separately,
1515 * devm_iio_device_free() must be used.
1516 *
1517 * RETURNS:
1518 * Pointer to allocated iio_dev on success, NULL on failure.
1519 */
1520 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1521 {
1522 struct iio_dev **ptr, *iio_dev;
1523
1524 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1525 GFP_KERNEL);
1526 if (!ptr)
1527 return NULL;
1528
1529 iio_dev = iio_device_alloc(sizeof_priv);
1530 if (iio_dev) {
1531 *ptr = iio_dev;
1532 devres_add(dev, ptr);
1533 } else {
1534 devres_free(ptr);
1535 }
1536
1537 return iio_dev;
1538 }
1539 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1540
1541 /**
1542 * devm_iio_device_free - Resource-managed iio_device_free()
1543 * @dev: Device this iio_dev belongs to
1544 * @iio_dev: the iio_dev associated with the device
1545 *
1546 * Free iio_dev allocated with devm_iio_device_alloc().
1547 */
1548 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1549 {
1550 int rc;
1551
1552 rc = devres_release(dev, devm_iio_device_release,
1553 devm_iio_device_match, iio_dev);
1554 WARN_ON(rc);
1555 }
1556 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1557
1558 /**
1559 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1560 * @inode: Inode structure for identifying the device in the file system
1561 * @filp: File structure for iio device used to keep and later access
1562 * private data
1563 *
1564 * Return: 0 on success or -EBUSY if the device is already opened
1565 **/
1566 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1567 {
1568 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1569 struct iio_dev, chrdev);
1570
1571 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1572 return -EBUSY;
1573
1574 iio_device_get(indio_dev);
1575
1576 filp->private_data = indio_dev;
1577
1578 return 0;
1579 }
1580
1581 /**
1582 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1583 * @inode: Inode structure pointer for the char device
1584 * @filp: File structure pointer for the char device
1585 *
1586 * Return: 0 for successful release
1587 */
1588 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1589 {
1590 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1591 struct iio_dev, chrdev);
1592 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1593 iio_device_put(indio_dev);
1594
1595 return 0;
1596 }
1597
1598 /* Somewhat of a cross file organization violation - ioctls here are actually
1599 * event related */
1600 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1601 {
1602 struct iio_dev *indio_dev = filp->private_data;
1603 int __user *ip = (int __user *)arg;
1604 int fd;
1605
1606 if (!indio_dev->info)
1607 return -ENODEV;
1608
1609 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1610 fd = iio_event_getfd(indio_dev);
1611 if (fd < 0)
1612 return fd;
1613 if (copy_to_user(ip, &fd, sizeof(fd)))
1614 return -EFAULT;
1615 return 0;
1616 }
1617 return -EINVAL;
1618 }
1619
1620 static const struct file_operations iio_buffer_fileops = {
1621 .read = iio_buffer_read_first_n_outer_addr,
1622 .release = iio_chrdev_release,
1623 .open = iio_chrdev_open,
1624 .poll = iio_buffer_poll_addr,
1625 .owner = THIS_MODULE,
1626 .llseek = noop_llseek,
1627 .unlocked_ioctl = iio_ioctl,
1628 .compat_ioctl = iio_ioctl,
1629 };
1630
1631 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1632 {
1633 int i, j;
1634 const struct iio_chan_spec *channels = indio_dev->channels;
1635
1636 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1637 return 0;
1638
1639 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1640 if (channels[i].scan_index < 0)
1641 continue;
1642 for (j = i + 1; j < indio_dev->num_channels; j++)
1643 if (channels[i].scan_index == channels[j].scan_index) {
1644 dev_err(&indio_dev->dev,
1645 "Duplicate scan index %d\n",
1646 channels[i].scan_index);
1647 return -EINVAL;
1648 }
1649 }
1650
1651 return 0;
1652 }
1653
1654 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1655
1656 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1657 {
1658 int ret;
1659
1660 indio_dev->driver_module = this_mod;
1661 /* If the calling driver did not initialize of_node, do it here */
1662 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1663 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1664
1665 ret = iio_check_unique_scan_index(indio_dev);
1666 if (ret < 0)
1667 return ret;
1668
1669 if (!indio_dev->info)
1670 return -EINVAL;
1671
1672 /* configure elements for the chrdev */
1673 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1674
1675 ret = iio_device_register_debugfs(indio_dev);
1676 if (ret) {
1677 dev_err(indio_dev->dev.parent,
1678 "Failed to register debugfs interfaces\n");
1679 return ret;
1680 }
1681
1682 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1683 if (ret) {
1684 dev_err(indio_dev->dev.parent,
1685 "Failed to create buffer sysfs interfaces\n");
1686 goto error_unreg_debugfs;
1687 }
1688
1689 ret = iio_device_register_sysfs(indio_dev);
1690 if (ret) {
1691 dev_err(indio_dev->dev.parent,
1692 "Failed to register sysfs interfaces\n");
1693 goto error_buffer_free_sysfs;
1694 }
1695 ret = iio_device_register_eventset(indio_dev);
1696 if (ret) {
1697 dev_err(indio_dev->dev.parent,
1698 "Failed to register event set\n");
1699 goto error_free_sysfs;
1700 }
1701 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1702 iio_device_register_trigger_consumer(indio_dev);
1703
1704 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1705 indio_dev->setup_ops == NULL)
1706 indio_dev->setup_ops = &noop_ring_setup_ops;
1707
1708 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1709
1710 indio_dev->chrdev.owner = this_mod;
1711
1712 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1713 if (ret < 0)
1714 goto error_unreg_eventset;
1715
1716 return 0;
1717
1718 error_unreg_eventset:
1719 iio_device_unregister_eventset(indio_dev);
1720 error_free_sysfs:
1721 iio_device_unregister_sysfs(indio_dev);
1722 error_buffer_free_sysfs:
1723 iio_buffer_free_sysfs_and_mask(indio_dev);
1724 error_unreg_debugfs:
1725 iio_device_unregister_debugfs(indio_dev);
1726 return ret;
1727 }
1728 EXPORT_SYMBOL(__iio_device_register);
1729
1730 /**
1731 * iio_device_unregister() - unregister a device from the IIO subsystem
1732 * @indio_dev: Device structure representing the device.
1733 **/
1734 void iio_device_unregister(struct iio_dev *indio_dev)
1735 {
1736 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1737
1738 mutex_lock(&indio_dev->info_exist_lock);
1739
1740 iio_device_unregister_debugfs(indio_dev);
1741
1742 iio_disable_all_buffers(indio_dev);
1743
1744 indio_dev->info = NULL;
1745
1746 iio_device_wakeup_eventset(indio_dev);
1747 iio_buffer_wakeup_poll(indio_dev);
1748
1749 mutex_unlock(&indio_dev->info_exist_lock);
1750
1751 iio_buffer_free_sysfs_and_mask(indio_dev);
1752 }
1753 EXPORT_SYMBOL(iio_device_unregister);
1754
1755 static void devm_iio_device_unreg(struct device *dev, void *res)
1756 {
1757 iio_device_unregister(*(struct iio_dev **)res);
1758 }
1759
1760 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1761 struct module *this_mod)
1762 {
1763 struct iio_dev **ptr;
1764 int ret;
1765
1766 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1767 if (!ptr)
1768 return -ENOMEM;
1769
1770 *ptr = indio_dev;
1771 ret = __iio_device_register(indio_dev, this_mod);
1772 if (!ret)
1773 devres_add(dev, ptr);
1774 else
1775 devres_free(ptr);
1776
1777 return ret;
1778 }
1779 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1780
1781 /**
1782 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1783 * @dev: Device this iio_dev belongs to
1784 * @indio_dev: the iio_dev associated with the device
1785 *
1786 * Unregister iio_dev registered with devm_iio_device_register().
1787 */
1788 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1789 {
1790 int rc;
1791
1792 rc = devres_release(dev, devm_iio_device_unreg,
1793 devm_iio_device_match, indio_dev);
1794 WARN_ON(rc);
1795 }
1796 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1797
1798 /**
1799 * iio_device_claim_direct_mode - Keep device in direct mode
1800 * @indio_dev: the iio_dev associated with the device
1801 *
1802 * If the device is in direct mode it is guaranteed to stay
1803 * that way until iio_device_release_direct_mode() is called.
1804 *
1805 * Use with iio_device_release_direct_mode()
1806 *
1807 * Returns: 0 on success, -EBUSY on failure
1808 */
1809 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1810 {
1811 mutex_lock(&indio_dev->mlock);
1812
1813 if (iio_buffer_enabled(indio_dev)) {
1814 mutex_unlock(&indio_dev->mlock);
1815 return -EBUSY;
1816 }
1817 return 0;
1818 }
1819 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1820
1821 /**
1822 * iio_device_release_direct_mode - releases claim on direct mode
1823 * @indio_dev: the iio_dev associated with the device
1824 *
1825 * Release the claim. Device is no longer guaranteed to stay
1826 * in direct mode.
1827 *
1828 * Use with iio_device_claim_direct_mode()
1829 */
1830 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1831 {
1832 mutex_unlock(&indio_dev->mlock);
1833 }
1834 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1835
1836 subsys_initcall(iio_init);
1837 module_exit(iio_exit);
1838
1839 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1840 MODULE_DESCRIPTION("Industrial I/O core");
1841 MODULE_LICENSE("GPL");
Linux with added FPC-III support