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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob245b5844028d1d9a0fca670585a88f2853adfe04
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* The industrial I/O core
3 *
4 * Copyright (c) 2008 Jonathan Cameron
5 *
6 * Based on elements of hwmon and input subsystems.
7 */
8
9 #define pr_fmt(fmt) "iio-core: " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/idr.h>
14 #include <linux/kdev_t.h>
15 #include <linux/err.h>
16 #include <linux/device.h>
17 #include <linux/fs.h>
18 #include <linux/poll.h>
19 #include <linux/property.h>
20 #include <linux/sched.h>
21 #include <linux/wait.h>
22 #include <linux/cdev.h>
23 #include <linux/slab.h>
24 #include <linux/anon_inodes.h>
25 #include <linux/debugfs.h>
26 #include <linux/mutex.h>
27 #include <linux/iio/iio.h>
28 #include "iio_core.h"
29 #include "iio_core_trigger.h"
30 #include <linux/iio/sysfs.h>
31 #include <linux/iio/events.h>
32 #include <linux/iio/buffer.h>
33 #include <linux/iio/buffer_impl.h>
34
35 /* IDA to assign each registered device a unique id */
36 static DEFINE_IDA(iio_ida);
37
38 static dev_t iio_devt;
39
40 #define IIO_DEV_MAX 256
41 struct bus_type iio_bus_type = {
42 .name = "iio",
43 };
44 EXPORT_SYMBOL(iio_bus_type);
45
46 static struct dentry *iio_debugfs_dentry;
47
48 static const char * const iio_direction[] = {
49 [0] = "in",
50 [1] = "out",
51 };
52
53 static const char * const iio_chan_type_name_spec[] = {
54 [IIO_VOLTAGE] = "voltage",
55 [IIO_CURRENT] = "current",
56 [IIO_POWER] = "power",
57 [IIO_ACCEL] = "accel",
58 [IIO_ANGL_VEL] = "anglvel",
59 [IIO_MAGN] = "magn",
60 [IIO_LIGHT] = "illuminance",
61 [IIO_INTENSITY] = "intensity",
62 [IIO_PROXIMITY] = "proximity",
63 [IIO_TEMP] = "temp",
64 [IIO_INCLI] = "incli",
65 [IIO_ROT] = "rot",
66 [IIO_ANGL] = "angl",
67 [IIO_TIMESTAMP] = "timestamp",
68 [IIO_CAPACITANCE] = "capacitance",
69 [IIO_ALTVOLTAGE] = "altvoltage",
70 [IIO_CCT] = "cct",
71 [IIO_PRESSURE] = "pressure",
72 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
73 [IIO_ACTIVITY] = "activity",
74 [IIO_STEPS] = "steps",
75 [IIO_ENERGY] = "energy",
76 [IIO_DISTANCE] = "distance",
77 [IIO_VELOCITY] = "velocity",
78 [IIO_CONCENTRATION] = "concentration",
79 [IIO_RESISTANCE] = "resistance",
80 [IIO_PH] = "ph",
81 [IIO_UVINDEX] = "uvindex",
82 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
83 [IIO_COUNT] = "count",
84 [IIO_INDEX] = "index",
85 [IIO_GRAVITY] = "gravity",
86 [IIO_POSITIONRELATIVE] = "positionrelative",
87 [IIO_PHASE] = "phase",
88 [IIO_MASSCONCENTRATION] = "massconcentration",
89 };
90
91 static const char * const iio_modifier_names[] = {
92 [IIO_MOD_X] = "x",
93 [IIO_MOD_Y] = "y",
94 [IIO_MOD_Z] = "z",
95 [IIO_MOD_X_AND_Y] = "x&y",
96 [IIO_MOD_X_AND_Z] = "x&z",
97 [IIO_MOD_Y_AND_Z] = "y&z",
98 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
99 [IIO_MOD_X_OR_Y] = "x|y",
100 [IIO_MOD_X_OR_Z] = "x|z",
101 [IIO_MOD_Y_OR_Z] = "y|z",
102 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
103 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
104 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
105 [IIO_MOD_LIGHT_BOTH] = "both",
106 [IIO_MOD_LIGHT_IR] = "ir",
107 [IIO_MOD_LIGHT_CLEAR] = "clear",
108 [IIO_MOD_LIGHT_RED] = "red",
109 [IIO_MOD_LIGHT_GREEN] = "green",
110 [IIO_MOD_LIGHT_BLUE] = "blue",
111 [IIO_MOD_LIGHT_UV] = "uv",
112 [IIO_MOD_LIGHT_DUV] = "duv",
113 [IIO_MOD_QUATERNION] = "quaternion",
114 [IIO_MOD_TEMP_AMBIENT] = "ambient",
115 [IIO_MOD_TEMP_OBJECT] = "object",
116 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
117 [IIO_MOD_NORTH_TRUE] = "from_north_true",
118 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
119 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
120 [IIO_MOD_RUNNING] = "running",
121 [IIO_MOD_JOGGING] = "jogging",
122 [IIO_MOD_WALKING] = "walking",
123 [IIO_MOD_STILL] = "still",
124 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
125 [IIO_MOD_I] = "i",
126 [IIO_MOD_Q] = "q",
127 [IIO_MOD_CO2] = "co2",
128 [IIO_MOD_VOC] = "voc",
129 [IIO_MOD_PM1] = "pm1",
130 [IIO_MOD_PM2P5] = "pm2p5",
131 [IIO_MOD_PM4] = "pm4",
132 [IIO_MOD_PM10] = "pm10",
133 };
134
135 /* relies on pairs of these shared then separate */
136 static const char * const iio_chan_info_postfix[] = {
137 [IIO_CHAN_INFO_RAW] = "raw",
138 [IIO_CHAN_INFO_PROCESSED] = "input",
139 [IIO_CHAN_INFO_SCALE] = "scale",
140 [IIO_CHAN_INFO_OFFSET] = "offset",
141 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
142 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
143 [IIO_CHAN_INFO_PEAK] = "peak_raw",
144 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
145 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
146 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
147 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
148 = "filter_low_pass_3db_frequency",
149 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
150 = "filter_high_pass_3db_frequency",
151 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
152 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
153 [IIO_CHAN_INFO_PHASE] = "phase",
154 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
155 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
156 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
157 [IIO_CHAN_INFO_ENABLE] = "en",
158 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
159 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
160 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
161 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
162 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
163 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
164 };
165
166 /**
167 * iio_find_channel_from_si() - get channel from its scan index
168 * @indio_dev: device
169 * @si: scan index to match
170 */
171 const struct iio_chan_spec
172 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
173 {
174 int i;
175
176 for (i = 0; i < indio_dev->num_channels; i++)
177 if (indio_dev->channels[i].scan_index == si)
178 return &indio_dev->channels[i];
179 return NULL;
180 }
181
182 /* This turns up an awful lot */
183 ssize_t iio_read_const_attr(struct device *dev,
184 struct device_attribute *attr,
185 char *buf)
186 {
187 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
188 }
189 EXPORT_SYMBOL(iio_read_const_attr);
190
191 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
192 {
193 int ret;
194 const struct iio_event_interface *ev_int = indio_dev->event_interface;
195
196 ret = mutex_lock_interruptible(&indio_dev->mlock);
197 if (ret)
198 return ret;
199 if ((ev_int && iio_event_enabled(ev_int)) ||
200 iio_buffer_enabled(indio_dev)) {
201 mutex_unlock(&indio_dev->mlock);
202 return -EBUSY;
203 }
204 indio_dev->clock_id = clock_id;
205 mutex_unlock(&indio_dev->mlock);
206
207 return 0;
208 }
209
210 /**
211 * iio_get_time_ns() - utility function to get a time stamp for events etc
212 * @indio_dev: device
213 */
214 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
215 {
216 struct timespec64 tp;
217
218 switch (iio_device_get_clock(indio_dev)) {
219 case CLOCK_REALTIME:
220 return ktime_get_real_ns();
221 case CLOCK_MONOTONIC:
222 return ktime_get_ns();
223 case CLOCK_MONOTONIC_RAW:
224 return ktime_get_raw_ns();
225 case CLOCK_REALTIME_COARSE:
226 return ktime_to_ns(ktime_get_coarse_real());
227 case CLOCK_MONOTONIC_COARSE:
228 ktime_get_coarse_ts64(&tp);
229 return timespec64_to_ns(&tp);
230 case CLOCK_BOOTTIME:
231 return ktime_get_boot_ns();
232 case CLOCK_TAI:
233 return ktime_get_tai_ns();
234 default:
235 BUG();
236 }
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 return ret;
314 }
315
316 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
317
318 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
319 }
320
321 static ssize_t iio_debugfs_write_reg(struct file *file,
322 const char __user *userbuf, size_t count, loff_t *ppos)
323 {
324 struct iio_dev *indio_dev = file->private_data;
325 unsigned reg, val;
326 char buf[80];
327 int ret;
328
329 count = min_t(size_t, count, (sizeof(buf)-1));
330 if (copy_from_user(buf, userbuf, count))
331 return -EFAULT;
332
333 buf[count] = 0;
334
335 ret = sscanf(buf, "%i %i", &reg, &val);
336
337 switch (ret) {
338 case 1:
339 indio_dev->cached_reg_addr = reg;
340 break;
341 case 2:
342 indio_dev->cached_reg_addr = reg;
343 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
344 val, NULL);
345 if (ret) {
346 dev_err(indio_dev->dev.parent, "%s: write failed\n",
347 __func__);
348 return ret;
349 }
350 break;
351 default:
352 return -EINVAL;
353 }
354
355 return count;
356 }
357
358 static const struct file_operations iio_debugfs_reg_fops = {
359 .open = simple_open,
360 .read = iio_debugfs_read_reg,
361 .write = iio_debugfs_write_reg,
362 };
363
364 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
365 {
366 debugfs_remove_recursive(indio_dev->debugfs_dentry);
367 }
368
369 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
370 {
371 struct dentry *d;
372
373 if (indio_dev->info->debugfs_reg_access == NULL)
374 return 0;
375
376 if (!iio_debugfs_dentry)
377 return 0;
378
379 indio_dev->debugfs_dentry =
380 debugfs_create_dir(dev_name(&indio_dev->dev),
381 iio_debugfs_dentry);
382 if (indio_dev->debugfs_dentry == NULL) {
383 dev_warn(indio_dev->dev.parent,
384 "Failed to create debugfs directory\n");
385 return -EFAULT;
386 }
387
388 d = debugfs_create_file("direct_reg_access", 0644,
389 indio_dev->debugfs_dentry,
390 indio_dev, &iio_debugfs_reg_fops);
391 if (!d) {
392 iio_device_unregister_debugfs(indio_dev);
393 return -ENOMEM;
394 }
395
396 return 0;
397 }
398 #else
399 static int iio_device_register_debugfs(struct iio_dev *indio_dev)
400 {
401 return 0;
402 }
403
404 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
405 {
406 }
407 #endif /* CONFIG_DEBUG_FS */
408
409 static ssize_t iio_read_channel_ext_info(struct device *dev,
410 struct device_attribute *attr,
411 char *buf)
412 {
413 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
414 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
415 const struct iio_chan_spec_ext_info *ext_info;
416
417 ext_info = &this_attr->c->ext_info[this_attr->address];
418
419 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
420 }
421
422 static ssize_t iio_write_channel_ext_info(struct device *dev,
423 struct device_attribute *attr,
424 const char *buf,
425 size_t len)
426 {
427 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
428 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
429 const struct iio_chan_spec_ext_info *ext_info;
430
431 ext_info = &this_attr->c->ext_info[this_attr->address];
432
433 return ext_info->write(indio_dev, ext_info->private,
434 this_attr->c, buf, len);
435 }
436
437 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
438 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
439 {
440 const struct iio_enum *e = (const struct iio_enum *)priv;
441 unsigned int i;
442 size_t len = 0;
443
444 if (!e->num_items)
445 return 0;
446
447 for (i = 0; i < e->num_items; ++i)
448 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
449
450 /* replace last space with a newline */
451 buf[len - 1] = '\n';
452
453 return len;
454 }
455 EXPORT_SYMBOL_GPL(iio_enum_available_read);
456
457 ssize_t iio_enum_read(struct iio_dev *indio_dev,
458 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
459 {
460 const struct iio_enum *e = (const struct iio_enum *)priv;
461 int i;
462
463 if (!e->get)
464 return -EINVAL;
465
466 i = e->get(indio_dev, chan);
467 if (i < 0)
468 return i;
469 else if (i >= e->num_items)
470 return -EINVAL;
471
472 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
473 }
474 EXPORT_SYMBOL_GPL(iio_enum_read);
475
476 ssize_t iio_enum_write(struct iio_dev *indio_dev,
477 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
478 size_t len)
479 {
480 const struct iio_enum *e = (const struct iio_enum *)priv;
481 int ret;
482
483 if (!e->set)
484 return -EINVAL;
485
486 ret = __sysfs_match_string(e->items, e->num_items, buf);
487 if (ret < 0)
488 return ret;
489
490 ret = e->set(indio_dev, chan, ret);
491 return ret ? ret : len;
492 }
493 EXPORT_SYMBOL_GPL(iio_enum_write);
494
495 static const struct iio_mount_matrix iio_mount_idmatrix = {
496 .rotation = {
497 "1", "0", "0",
498 "0", "1", "0",
499 "0", "0", "1"
500 }
501 };
502
503 static int iio_setup_mount_idmatrix(const struct device *dev,
504 struct iio_mount_matrix *matrix)
505 {
506 *matrix = iio_mount_idmatrix;
507 dev_info(dev, "mounting matrix not found: using identity...\n");
508 return 0;
509 }
510
511 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
512 const struct iio_chan_spec *chan, char *buf)
513 {
514 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
515 priv)(indio_dev, chan);
516
517 if (IS_ERR(mtx))
518 return PTR_ERR(mtx);
519
520 if (!mtx)
521 mtx = &iio_mount_idmatrix;
522
523 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
524 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
525 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
526 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
527 }
528 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
529
530 /**
531 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
532 * device "mount-matrix" property
533 * @dev: device the mounting matrix property is assigned to
534 * @propname: device specific mounting matrix property name
535 * @matrix: where to store retrieved matrix
536 *
537 * If device is assigned no mounting matrix property, a default 3x3 identity
538 * matrix will be filled in.
539 *
540 * Return: 0 if success, or a negative error code on failure.
541 */
542 int iio_read_mount_matrix(struct device *dev, const char *propname,
543 struct iio_mount_matrix *matrix)
544 {
545 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
546 int err;
547
548 err = device_property_read_string_array(dev, propname,
549 matrix->rotation, len);
550 if (err == len)
551 return 0;
552
553 if (err >= 0)
554 /* Invalid number of matrix entries. */
555 return -EINVAL;
556
557 if (err != -EINVAL)
558 /* Invalid matrix declaration format. */
559 return err;
560
561 /* Matrix was not declared at all: fallback to identity. */
562 return iio_setup_mount_idmatrix(dev, matrix);
563 }
564 EXPORT_SYMBOL(iio_read_mount_matrix);
565
566 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
567 int size, const int *vals)
568 {
569 unsigned long long tmp;
570 int tmp0, tmp1;
571 bool scale_db = false;
572
573 switch (type) {
574 case IIO_VAL_INT:
575 return snprintf(buf, len, "%d", vals[0]);
576 case IIO_VAL_INT_PLUS_MICRO_DB:
577 scale_db = true;
578 /* fall through */
579 case IIO_VAL_INT_PLUS_MICRO:
580 if (vals[1] < 0)
581 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
582 -vals[1], scale_db ? " dB" : "");
583 else
584 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
585 scale_db ? " dB" : "");
586 case IIO_VAL_INT_PLUS_NANO:
587 if (vals[1] < 0)
588 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
589 -vals[1]);
590 else
591 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
592 case IIO_VAL_FRACTIONAL:
593 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
594 tmp1 = vals[1];
595 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
596 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
597 case IIO_VAL_FRACTIONAL_LOG2:
598 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
599 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
600 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
601 case IIO_VAL_INT_MULTIPLE:
602 {
603 int i;
604 int l = 0;
605
606 for (i = 0; i < size; ++i) {
607 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
608 if (l >= len)
609 break;
610 }
611 return l;
612 }
613 default:
614 return 0;
615 }
616 }
617
618 /**
619 * iio_format_value() - Formats a IIO value into its string representation
620 * @buf: The buffer to which the formatted value gets written
621 * which is assumed to be big enough (i.e. PAGE_SIZE).
622 * @type: One of the IIO_VAL_* constants. This decides how the val
623 * and val2 parameters are formatted.
624 * @size: Number of IIO value entries contained in vals
625 * @vals: Pointer to the values, exact meaning depends on the
626 * type parameter.
627 *
628 * Return: 0 by default, a negative number on failure or the
629 * total number of characters written for a type that belongs
630 * to the IIO_VAL_* constant.
631 */
632 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
633 {
634 ssize_t len;
635
636 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
637 if (len >= PAGE_SIZE - 1)
638 return -EFBIG;
639
640 return len + sprintf(buf + len, "\n");
641 }
642 EXPORT_SYMBOL_GPL(iio_format_value);
643
644 static ssize_t iio_read_channel_info(struct device *dev,
645 struct device_attribute *attr,
646 char *buf)
647 {
648 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
649 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
650 int vals[INDIO_MAX_RAW_ELEMENTS];
651 int ret;
652 int val_len = 2;
653
654 if (indio_dev->info->read_raw_multi)
655 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
656 INDIO_MAX_RAW_ELEMENTS,
657 vals, &val_len,
658 this_attr->address);
659 else
660 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
661 &vals[0], &vals[1], this_attr->address);
662
663 if (ret < 0)
664 return ret;
665
666 return iio_format_value(buf, ret, val_len, vals);
667 }
668
669 static ssize_t iio_format_avail_list(char *buf, const int *vals,
670 int type, int length)
671 {
672 int i;
673 ssize_t len = 0;
674
675 switch (type) {
676 case IIO_VAL_INT:
677 for (i = 0; i < length; i++) {
678 len += __iio_format_value(buf + len, PAGE_SIZE - len,
679 type, 1, &vals[i]);
680 if (len >= PAGE_SIZE)
681 return -EFBIG;
682 if (i < length - 1)
683 len += snprintf(buf + len, PAGE_SIZE - len,
684 " ");
685 else
686 len += snprintf(buf + len, PAGE_SIZE - len,
687 "\n");
688 if (len >= PAGE_SIZE)
689 return -EFBIG;
690 }
691 break;
692 default:
693 for (i = 0; i < length / 2; i++) {
694 len += __iio_format_value(buf + len, PAGE_SIZE - len,
695 type, 2, &vals[i * 2]);
696 if (len >= PAGE_SIZE)
697 return -EFBIG;
698 if (i < length / 2 - 1)
699 len += snprintf(buf + len, PAGE_SIZE - len,
700 " ");
701 else
702 len += snprintf(buf + len, PAGE_SIZE - len,
703 "\n");
704 if (len >= PAGE_SIZE)
705 return -EFBIG;
706 }
707 }
708
709 return len;
710 }
711
712 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
713 {
714 int i;
715 ssize_t len;
716
717 len = snprintf(buf, PAGE_SIZE, "[");
718 switch (type) {
719 case IIO_VAL_INT:
720 for (i = 0; i < 3; i++) {
721 len += __iio_format_value(buf + len, PAGE_SIZE - len,
722 type, 1, &vals[i]);
723 if (len >= PAGE_SIZE)
724 return -EFBIG;
725 if (i < 2)
726 len += snprintf(buf + len, PAGE_SIZE - len,
727 " ");
728 else
729 len += snprintf(buf + len, PAGE_SIZE - len,
730 "]\n");
731 if (len >= PAGE_SIZE)
732 return -EFBIG;
733 }
734 break;
735 default:
736 for (i = 0; i < 3; i++) {
737 len += __iio_format_value(buf + len, PAGE_SIZE - len,
738 type, 2, &vals[i * 2]);
739 if (len >= PAGE_SIZE)
740 return -EFBIG;
741 if (i < 2)
742 len += snprintf(buf + len, PAGE_SIZE - len,
743 " ");
744 else
745 len += snprintf(buf + len, PAGE_SIZE - len,
746 "]\n");
747 if (len >= PAGE_SIZE)
748 return -EFBIG;
749 }
750 }
751
752 return len;
753 }
754
755 static ssize_t iio_read_channel_info_avail(struct device *dev,
756 struct device_attribute *attr,
757 char *buf)
758 {
759 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
760 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
761 const int *vals;
762 int ret;
763 int length;
764 int type;
765
766 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
767 &vals, &type, &length,
768 this_attr->address);
769
770 if (ret < 0)
771 return ret;
772 switch (ret) {
773 case IIO_AVAIL_LIST:
774 return iio_format_avail_list(buf, vals, type, length);
775 case IIO_AVAIL_RANGE:
776 return iio_format_avail_range(buf, vals, type);
777 default:
778 return -EINVAL;
779 }
780 }
781
782 /**
783 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
784 * @str: The string to parse
785 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
786 * @integer: The integer part of the number
787 * @fract: The fractional part of the number
788 *
789 * Returns 0 on success, or a negative error code if the string could not be
790 * parsed.
791 */
792 int iio_str_to_fixpoint(const char *str, int fract_mult,
793 int *integer, int *fract)
794 {
795 int i = 0, f = 0;
796 bool integer_part = true, negative = false;
797
798 if (fract_mult == 0) {
799 *fract = 0;
800
801 return kstrtoint(str, 0, integer);
802 }
803
804 if (str[0] == '-') {
805 negative = true;
806 str++;
807 } else if (str[0] == '+') {
808 str++;
809 }
810
811 while (*str) {
812 if ('0' <= *str && *str <= '9') {
813 if (integer_part) {
814 i = i * 10 + *str - '0';
815 } else {
816 f += fract_mult * (*str - '0');
817 fract_mult /= 10;
818 }
819 } else if (*str == '\n') {
820 if (*(str + 1) == '\0')
821 break;
822 else
823 return -EINVAL;
824 } else if (*str == '.' && integer_part) {
825 integer_part = false;
826 } else {
827 return -EINVAL;
828 }
829 str++;
830 }
831
832 if (negative) {
833 if (i)
834 i = -i;
835 else
836 f = -f;
837 }
838
839 *integer = i;
840 *fract = f;
841
842 return 0;
843 }
844 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
845
846 static ssize_t iio_write_channel_info(struct device *dev,
847 struct device_attribute *attr,
848 const char *buf,
849 size_t len)
850 {
851 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
852 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
853 int ret, fract_mult = 100000;
854 int integer, fract;
855
856 /* Assumes decimal - precision based on number of digits */
857 if (!indio_dev->info->write_raw)
858 return -EINVAL;
859
860 if (indio_dev->info->write_raw_get_fmt)
861 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
862 this_attr->c, this_attr->address)) {
863 case IIO_VAL_INT:
864 fract_mult = 0;
865 break;
866 case IIO_VAL_INT_PLUS_MICRO:
867 fract_mult = 100000;
868 break;
869 case IIO_VAL_INT_PLUS_NANO:
870 fract_mult = 100000000;
871 break;
872 default:
873 return -EINVAL;
874 }
875
876 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
877 if (ret)
878 return ret;
879
880 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
881 integer, fract, this_attr->address);
882 if (ret)
883 return ret;
884
885 return len;
886 }
887
888 static
889 int __iio_device_attr_init(struct device_attribute *dev_attr,
890 const char *postfix,
891 struct iio_chan_spec const *chan,
892 ssize_t (*readfunc)(struct device *dev,
893 struct device_attribute *attr,
894 char *buf),
895 ssize_t (*writefunc)(struct device *dev,
896 struct device_attribute *attr,
897 const char *buf,
898 size_t len),
899 enum iio_shared_by shared_by)
900 {
901 int ret = 0;
902 char *name = NULL;
903 char *full_postfix;
904 sysfs_attr_init(&dev_attr->attr);
905
906 /* Build up postfix of <extend_name>_<modifier>_postfix */
907 if (chan->modified && (shared_by == IIO_SEPARATE)) {
908 if (chan->extend_name)
909 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
910 iio_modifier_names[chan
911 ->channel2],
912 chan->extend_name,
913 postfix);
914 else
915 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
916 iio_modifier_names[chan
917 ->channel2],
918 postfix);
919 } else {
920 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
921 full_postfix = kstrdup(postfix, GFP_KERNEL);
922 else
923 full_postfix = kasprintf(GFP_KERNEL,
924 "%s_%s",
925 chan->extend_name,
926 postfix);
927 }
928 if (full_postfix == NULL)
929 return -ENOMEM;
930
931 if (chan->differential) { /* Differential can not have modifier */
932 switch (shared_by) {
933 case IIO_SHARED_BY_ALL:
934 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
935 break;
936 case IIO_SHARED_BY_DIR:
937 name = kasprintf(GFP_KERNEL, "%s_%s",
938 iio_direction[chan->output],
939 full_postfix);
940 break;
941 case IIO_SHARED_BY_TYPE:
942 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
943 iio_direction[chan->output],
944 iio_chan_type_name_spec[chan->type],
945 iio_chan_type_name_spec[chan->type],
946 full_postfix);
947 break;
948 case IIO_SEPARATE:
949 if (!chan->indexed) {
950 WARN(1, "Differential channels must be indexed\n");
951 ret = -EINVAL;
952 goto error_free_full_postfix;
953 }
954 name = kasprintf(GFP_KERNEL,
955 "%s_%s%d-%s%d_%s",
956 iio_direction[chan->output],
957 iio_chan_type_name_spec[chan->type],
958 chan->channel,
959 iio_chan_type_name_spec[chan->type],
960 chan->channel2,
961 full_postfix);
962 break;
963 }
964 } else { /* Single ended */
965 switch (shared_by) {
966 case IIO_SHARED_BY_ALL:
967 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
968 break;
969 case IIO_SHARED_BY_DIR:
970 name = kasprintf(GFP_KERNEL, "%s_%s",
971 iio_direction[chan->output],
972 full_postfix);
973 break;
974 case IIO_SHARED_BY_TYPE:
975 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
976 iio_direction[chan->output],
977 iio_chan_type_name_spec[chan->type],
978 full_postfix);
979 break;
980
981 case IIO_SEPARATE:
982 if (chan->indexed)
983 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
984 iio_direction[chan->output],
985 iio_chan_type_name_spec[chan->type],
986 chan->channel,
987 full_postfix);
988 else
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 }
996 if (name == NULL) {
997 ret = -ENOMEM;
998 goto error_free_full_postfix;
999 }
1000 dev_attr->attr.name = name;
1001
1002 if (readfunc) {
1003 dev_attr->attr.mode |= S_IRUGO;
1004 dev_attr->show = readfunc;
1005 }
1006
1007 if (writefunc) {
1008 dev_attr->attr.mode |= S_IWUSR;
1009 dev_attr->store = writefunc;
1010 }
1011
1012 error_free_full_postfix:
1013 kfree(full_postfix);
1014
1015 return ret;
1016 }
1017
1018 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1019 {
1020 kfree(dev_attr->attr.name);
1021 }
1022
1023 int __iio_add_chan_devattr(const char *postfix,
1024 struct iio_chan_spec const *chan,
1025 ssize_t (*readfunc)(struct device *dev,
1026 struct device_attribute *attr,
1027 char *buf),
1028 ssize_t (*writefunc)(struct device *dev,
1029 struct device_attribute *attr,
1030 const char *buf,
1031 size_t len),
1032 u64 mask,
1033 enum iio_shared_by shared_by,
1034 struct device *dev,
1035 struct list_head *attr_list)
1036 {
1037 int ret;
1038 struct iio_dev_attr *iio_attr, *t;
1039
1040 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1041 if (iio_attr == NULL)
1042 return -ENOMEM;
1043 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1044 postfix, chan,
1045 readfunc, writefunc, shared_by);
1046 if (ret)
1047 goto error_iio_dev_attr_free;
1048 iio_attr->c = chan;
1049 iio_attr->address = mask;
1050 list_for_each_entry(t, attr_list, l)
1051 if (strcmp(t->dev_attr.attr.name,
1052 iio_attr->dev_attr.attr.name) == 0) {
1053 if (shared_by == IIO_SEPARATE)
1054 dev_err(dev, "tried to double register : %s\n",
1055 t->dev_attr.attr.name);
1056 ret = -EBUSY;
1057 goto error_device_attr_deinit;
1058 }
1059 list_add(&iio_attr->l, attr_list);
1060
1061 return 0;
1062
1063 error_device_attr_deinit:
1064 __iio_device_attr_deinit(&iio_attr->dev_attr);
1065 error_iio_dev_attr_free:
1066 kfree(iio_attr);
1067 return ret;
1068 }
1069
1070 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1071 struct iio_chan_spec const *chan,
1072 enum iio_shared_by shared_by,
1073 const long *infomask)
1074 {
1075 int i, ret, attrcount = 0;
1076
1077 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1078 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1079 return -EINVAL;
1080 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1081 chan,
1082 &iio_read_channel_info,
1083 &iio_write_channel_info,
1084 i,
1085 shared_by,
1086 &indio_dev->dev,
1087 &indio_dev->channel_attr_list);
1088 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1089 continue;
1090 else if (ret < 0)
1091 return ret;
1092 attrcount++;
1093 }
1094
1095 return attrcount;
1096 }
1097
1098 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1099 struct iio_chan_spec const *chan,
1100 enum iio_shared_by shared_by,
1101 const long *infomask)
1102 {
1103 int i, ret, attrcount = 0;
1104 char *avail_postfix;
1105
1106 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1107 avail_postfix = kasprintf(GFP_KERNEL,
1108 "%s_available",
1109 iio_chan_info_postfix[i]);
1110 if (!avail_postfix)
1111 return -ENOMEM;
1112
1113 ret = __iio_add_chan_devattr(avail_postfix,
1114 chan,
1115 &iio_read_channel_info_avail,
1116 NULL,
1117 i,
1118 shared_by,
1119 &indio_dev->dev,
1120 &indio_dev->channel_attr_list);
1121 kfree(avail_postfix);
1122 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1123 continue;
1124 else if (ret < 0)
1125 return ret;
1126 attrcount++;
1127 }
1128
1129 return attrcount;
1130 }
1131
1132 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1133 struct iio_chan_spec const *chan)
1134 {
1135 int ret, attrcount = 0;
1136 const struct iio_chan_spec_ext_info *ext_info;
1137
1138 if (chan->channel < 0)
1139 return 0;
1140 ret = iio_device_add_info_mask_type(indio_dev, chan,
1141 IIO_SEPARATE,
1142 &chan->info_mask_separate);
1143 if (ret < 0)
1144 return ret;
1145 attrcount += ret;
1146
1147 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1148 IIO_SEPARATE,
1149 &chan->
1150 info_mask_separate_available);
1151 if (ret < 0)
1152 return ret;
1153 attrcount += ret;
1154
1155 ret = iio_device_add_info_mask_type(indio_dev, chan,
1156 IIO_SHARED_BY_TYPE,
1157 &chan->info_mask_shared_by_type);
1158 if (ret < 0)
1159 return ret;
1160 attrcount += ret;
1161
1162 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1163 IIO_SHARED_BY_TYPE,
1164 &chan->
1165 info_mask_shared_by_type_available);
1166 if (ret < 0)
1167 return ret;
1168 attrcount += ret;
1169
1170 ret = iio_device_add_info_mask_type(indio_dev, chan,
1171 IIO_SHARED_BY_DIR,
1172 &chan->info_mask_shared_by_dir);
1173 if (ret < 0)
1174 return ret;
1175 attrcount += ret;
1176
1177 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1178 IIO_SHARED_BY_DIR,
1179 &chan->info_mask_shared_by_dir_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_ALL,
1186 &chan->info_mask_shared_by_all);
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_ALL,
1193 &chan->info_mask_shared_by_all_available);
1194 if (ret < 0)
1195 return ret;
1196 attrcount += ret;
1197
1198 if (chan->ext_info) {
1199 unsigned int i = 0;
1200 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1201 ret = __iio_add_chan_devattr(ext_info->name,
1202 chan,
1203 ext_info->read ?
1204 &iio_read_channel_ext_info : NULL,
1205 ext_info->write ?
1206 &iio_write_channel_ext_info : NULL,
1207 i,
1208 ext_info->shared,
1209 &indio_dev->dev,
1210 &indio_dev->channel_attr_list);
1211 i++;
1212 if (ret == -EBUSY && ext_info->shared)
1213 continue;
1214
1215 if (ret)
1216 return ret;
1217
1218 attrcount++;
1219 }
1220 }
1221
1222 return attrcount;
1223 }
1224
1225 /**
1226 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1227 * @attr_list: List of IIO device attributes
1228 *
1229 * This function frees the memory allocated for each of the IIO device
1230 * attributes in the list.
1231 */
1232 void iio_free_chan_devattr_list(struct list_head *attr_list)
1233 {
1234 struct iio_dev_attr *p, *n;
1235
1236 list_for_each_entry_safe(p, n, attr_list, l) {
1237 kfree(p->dev_attr.attr.name);
1238 list_del(&p->l);
1239 kfree(p);
1240 }
1241 }
1242
1243 static ssize_t iio_show_dev_name(struct device *dev,
1244 struct device_attribute *attr,
1245 char *buf)
1246 {
1247 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1248 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1249 }
1250
1251 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1252
1253 static ssize_t iio_show_timestamp_clock(struct device *dev,
1254 struct device_attribute *attr,
1255 char *buf)
1256 {
1257 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1258 const clockid_t clk = iio_device_get_clock(indio_dev);
1259 const char *name;
1260 ssize_t sz;
1261
1262 switch (clk) {
1263 case CLOCK_REALTIME:
1264 name = "realtime\n";
1265 sz = sizeof("realtime\n");
1266 break;
1267 case CLOCK_MONOTONIC:
1268 name = "monotonic\n";
1269 sz = sizeof("monotonic\n");
1270 break;
1271 case CLOCK_MONOTONIC_RAW:
1272 name = "monotonic_raw\n";
1273 sz = sizeof("monotonic_raw\n");
1274 break;
1275 case CLOCK_REALTIME_COARSE:
1276 name = "realtime_coarse\n";
1277 sz = sizeof("realtime_coarse\n");
1278 break;
1279 case CLOCK_MONOTONIC_COARSE:
1280 name = "monotonic_coarse\n";
1281 sz = sizeof("monotonic_coarse\n");
1282 break;
1283 case CLOCK_BOOTTIME:
1284 name = "boottime\n";
1285 sz = sizeof("boottime\n");
1286 break;
1287 case CLOCK_TAI:
1288 name = "tai\n";
1289 sz = sizeof("tai\n");
1290 break;
1291 default:
1292 BUG();
1293 }
1294
1295 memcpy(buf, name, sz);
1296 return sz;
1297 }
1298
1299 static ssize_t iio_store_timestamp_clock(struct device *dev,
1300 struct device_attribute *attr,
1301 const char *buf, size_t len)
1302 {
1303 clockid_t clk;
1304 int ret;
1305
1306 if (sysfs_streq(buf, "realtime"))
1307 clk = CLOCK_REALTIME;
1308 else if (sysfs_streq(buf, "monotonic"))
1309 clk = CLOCK_MONOTONIC;
1310 else if (sysfs_streq(buf, "monotonic_raw"))
1311 clk = CLOCK_MONOTONIC_RAW;
1312 else if (sysfs_streq(buf, "realtime_coarse"))
1313 clk = CLOCK_REALTIME_COARSE;
1314 else if (sysfs_streq(buf, "monotonic_coarse"))
1315 clk = CLOCK_MONOTONIC_COARSE;
1316 else if (sysfs_streq(buf, "boottime"))
1317 clk = CLOCK_BOOTTIME;
1318 else if (sysfs_streq(buf, "tai"))
1319 clk = CLOCK_TAI;
1320 else
1321 return -EINVAL;
1322
1323 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1324 if (ret)
1325 return ret;
1326
1327 return len;
1328 }
1329
1330 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1331 iio_show_timestamp_clock, iio_store_timestamp_clock);
1332
1333 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1334 {
1335 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1336 struct iio_dev_attr *p;
1337 struct attribute **attr, *clk = NULL;
1338
1339 /* First count elements in any existing group */
1340 if (indio_dev->info->attrs) {
1341 attr = indio_dev->info->attrs->attrs;
1342 while (*attr++ != NULL)
1343 attrcount_orig++;
1344 }
1345 attrcount = attrcount_orig;
1346 /*
1347 * New channel registration method - relies on the fact a group does
1348 * not need to be initialized if its name is NULL.
1349 */
1350 if (indio_dev->channels)
1351 for (i = 0; i < indio_dev->num_channels; i++) {
1352 const struct iio_chan_spec *chan =
1353 &indio_dev->channels[i];
1354
1355 if (chan->type == IIO_TIMESTAMP)
1356 clk = &dev_attr_current_timestamp_clock.attr;
1357
1358 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1359 if (ret < 0)
1360 goto error_clear_attrs;
1361 attrcount += ret;
1362 }
1363
1364 if (indio_dev->event_interface)
1365 clk = &dev_attr_current_timestamp_clock.attr;
1366
1367 if (indio_dev->name)
1368 attrcount++;
1369 if (clk)
1370 attrcount++;
1371
1372 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1373 sizeof(indio_dev->chan_attr_group.attrs[0]),
1374 GFP_KERNEL);
1375 if (indio_dev->chan_attr_group.attrs == NULL) {
1376 ret = -ENOMEM;
1377 goto error_clear_attrs;
1378 }
1379 /* Copy across original attributes */
1380 if (indio_dev->info->attrs)
1381 memcpy(indio_dev->chan_attr_group.attrs,
1382 indio_dev->info->attrs->attrs,
1383 sizeof(indio_dev->chan_attr_group.attrs[0])
1384 *attrcount_orig);
1385 attrn = attrcount_orig;
1386 /* Add all elements from the list. */
1387 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1388 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1389 if (indio_dev->name)
1390 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1391 if (clk)
1392 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1393
1394 indio_dev->groups[indio_dev->groupcounter++] =
1395 &indio_dev->chan_attr_group;
1396
1397 return 0;
1398
1399 error_clear_attrs:
1400 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1401
1402 return ret;
1403 }
1404
1405 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1406 {
1407
1408 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1409 kfree(indio_dev->chan_attr_group.attrs);
1410 indio_dev->chan_attr_group.attrs = NULL;
1411 }
1412
1413 static void iio_dev_release(struct device *device)
1414 {
1415 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1416 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1417 iio_device_unregister_trigger_consumer(indio_dev);
1418 iio_device_unregister_eventset(indio_dev);
1419 iio_device_unregister_sysfs(indio_dev);
1420
1421 iio_buffer_put(indio_dev->buffer);
1422
1423 ida_simple_remove(&iio_ida, indio_dev->id);
1424 kfree(indio_dev);
1425 }
1426
1427 struct device_type iio_device_type = {
1428 .name = "iio_device",
1429 .release = iio_dev_release,
1430 };
1431
1432 /**
1433 * iio_device_alloc() - allocate an iio_dev from a driver
1434 * @sizeof_priv: Space to allocate for private structure.
1435 **/
1436 struct iio_dev *iio_device_alloc(int sizeof_priv)
1437 {
1438 struct iio_dev *dev;
1439 size_t alloc_size;
1440
1441 alloc_size = sizeof(struct iio_dev);
1442 if (sizeof_priv) {
1443 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1444 alloc_size += sizeof_priv;
1445 }
1446 /* ensure 32-byte alignment of whole construct ? */
1447 alloc_size += IIO_ALIGN - 1;
1448
1449 dev = kzalloc(alloc_size, GFP_KERNEL);
1450
1451 if (dev) {
1452 dev->dev.groups = dev->groups;
1453 dev->dev.type = &iio_device_type;
1454 dev->dev.bus = &iio_bus_type;
1455 device_initialize(&dev->dev);
1456 dev_set_drvdata(&dev->dev, (void *)dev);
1457 mutex_init(&dev->mlock);
1458 mutex_init(&dev->info_exist_lock);
1459 INIT_LIST_HEAD(&dev->channel_attr_list);
1460
1461 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1462 if (dev->id < 0) {
1463 /* cannot use a dev_err as the name isn't available */
1464 pr_err("failed to get device id\n");
1465 kfree(dev);
1466 return NULL;
1467 }
1468 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1469 INIT_LIST_HEAD(&dev->buffer_list);
1470 }
1471
1472 return dev;
1473 }
1474 EXPORT_SYMBOL(iio_device_alloc);
1475
1476 /**
1477 * iio_device_free() - free an iio_dev from a driver
1478 * @dev: the iio_dev associated with the device
1479 **/
1480 void iio_device_free(struct iio_dev *dev)
1481 {
1482 if (dev)
1483 put_device(&dev->dev);
1484 }
1485 EXPORT_SYMBOL(iio_device_free);
1486
1487 static void devm_iio_device_release(struct device *dev, void *res)
1488 {
1489 iio_device_free(*(struct iio_dev **)res);
1490 }
1491
1492 int devm_iio_device_match(struct device *dev, void *res, void *data)
1493 {
1494 struct iio_dev **r = res;
1495 if (!r || !*r) {
1496 WARN_ON(!r || !*r);
1497 return 0;
1498 }
1499 return *r == data;
1500 }
1501 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1502
1503 /**
1504 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1505 * @dev: Device to allocate iio_dev for
1506 * @sizeof_priv: Space to allocate for private structure.
1507 *
1508 * Managed iio_device_alloc. iio_dev allocated with this function is
1509 * automatically freed on driver detach.
1510 *
1511 * If an iio_dev allocated with this function needs to be freed separately,
1512 * devm_iio_device_free() must be used.
1513 *
1514 * RETURNS:
1515 * Pointer to allocated iio_dev on success, NULL on failure.
1516 */
1517 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1518 {
1519 struct iio_dev **ptr, *iio_dev;
1520
1521 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1522 GFP_KERNEL);
1523 if (!ptr)
1524 return NULL;
1525
1526 iio_dev = iio_device_alloc(sizeof_priv);
1527 if (iio_dev) {
1528 *ptr = iio_dev;
1529 devres_add(dev, ptr);
1530 } else {
1531 devres_free(ptr);
1532 }
1533
1534 return iio_dev;
1535 }
1536 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1537
1538 /**
1539 * devm_iio_device_free - Resource-managed iio_device_free()
1540 * @dev: Device this iio_dev belongs to
1541 * @iio_dev: the iio_dev associated with the device
1542 *
1543 * Free iio_dev allocated with devm_iio_device_alloc().
1544 */
1545 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1546 {
1547 int rc;
1548
1549 rc = devres_release(dev, devm_iio_device_release,
1550 devm_iio_device_match, iio_dev);
1551 WARN_ON(rc);
1552 }
1553 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1554
1555 /**
1556 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1557 * @inode: Inode structure for identifying the device in the file system
1558 * @filp: File structure for iio device used to keep and later access
1559 * private data
1560 *
1561 * Return: 0 on success or -EBUSY if the device is already opened
1562 **/
1563 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1564 {
1565 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1566 struct iio_dev, chrdev);
1567
1568 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1569 return -EBUSY;
1570
1571 iio_device_get(indio_dev);
1572
1573 filp->private_data = indio_dev;
1574
1575 return 0;
1576 }
1577
1578 /**
1579 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1580 * @inode: Inode structure pointer for the char device
1581 * @filp: File structure pointer for the char device
1582 *
1583 * Return: 0 for successful release
1584 */
1585 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1586 {
1587 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1588 struct iio_dev, chrdev);
1589 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1590 iio_device_put(indio_dev);
1591
1592 return 0;
1593 }
1594
1595 /* Somewhat of a cross file organization violation - ioctls here are actually
1596 * event related */
1597 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1598 {
1599 struct iio_dev *indio_dev = filp->private_data;
1600 int __user *ip = (int __user *)arg;
1601 int fd;
1602
1603 if (!indio_dev->info)
1604 return -ENODEV;
1605
1606 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1607 fd = iio_event_getfd(indio_dev);
1608 if (fd < 0)
1609 return fd;
1610 if (copy_to_user(ip, &fd, sizeof(fd)))
1611 return -EFAULT;
1612 return 0;
1613 }
1614 return -EINVAL;
1615 }
1616
1617 static const struct file_operations iio_buffer_fileops = {
1618 .read = iio_buffer_read_first_n_outer_addr,
1619 .release = iio_chrdev_release,
1620 .open = iio_chrdev_open,
1621 .poll = iio_buffer_poll_addr,
1622 .owner = THIS_MODULE,
1623 .llseek = noop_llseek,
1624 .unlocked_ioctl = iio_ioctl,
1625 .compat_ioctl = iio_ioctl,
1626 };
1627
1628 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1629 {
1630 int i, j;
1631 const struct iio_chan_spec *channels = indio_dev->channels;
1632
1633 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1634 return 0;
1635
1636 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1637 if (channels[i].scan_index < 0)
1638 continue;
1639 for (j = i + 1; j < indio_dev->num_channels; j++)
1640 if (channels[i].scan_index == channels[j].scan_index) {
1641 dev_err(&indio_dev->dev,
1642 "Duplicate scan index %d\n",
1643 channels[i].scan_index);
1644 return -EINVAL;
1645 }
1646 }
1647
1648 return 0;
1649 }
1650
1651 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1652
1653 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1654 {
1655 int ret;
1656
1657 indio_dev->driver_module = this_mod;
1658 /* If the calling driver did not initialize of_node, do it here */
1659 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1660 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1661
1662 ret = iio_check_unique_scan_index(indio_dev);
1663 if (ret < 0)
1664 return ret;
1665
1666 if (!indio_dev->info)
1667 return -EINVAL;
1668
1669 /* configure elements for the chrdev */
1670 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1671
1672 ret = iio_device_register_debugfs(indio_dev);
1673 if (ret) {
1674 dev_err(indio_dev->dev.parent,
1675 "Failed to register debugfs interfaces\n");
1676 return ret;
1677 }
1678
1679 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1680 if (ret) {
1681 dev_err(indio_dev->dev.parent,
1682 "Failed to create buffer sysfs interfaces\n");
1683 goto error_unreg_debugfs;
1684 }
1685
1686 ret = iio_device_register_sysfs(indio_dev);
1687 if (ret) {
1688 dev_err(indio_dev->dev.parent,
1689 "Failed to register sysfs interfaces\n");
1690 goto error_buffer_free_sysfs;
1691 }
1692 ret = iio_device_register_eventset(indio_dev);
1693 if (ret) {
1694 dev_err(indio_dev->dev.parent,
1695 "Failed to register event set\n");
1696 goto error_free_sysfs;
1697 }
1698 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1699 iio_device_register_trigger_consumer(indio_dev);
1700
1701 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1702 indio_dev->setup_ops == NULL)
1703 indio_dev->setup_ops = &noop_ring_setup_ops;
1704
1705 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1706
1707 indio_dev->chrdev.owner = this_mod;
1708
1709 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1710 if (ret < 0)
1711 goto error_unreg_eventset;
1712
1713 return 0;
1714
1715 error_unreg_eventset:
1716 iio_device_unregister_eventset(indio_dev);
1717 error_free_sysfs:
1718 iio_device_unregister_sysfs(indio_dev);
1719 error_buffer_free_sysfs:
1720 iio_buffer_free_sysfs_and_mask(indio_dev);
1721 error_unreg_debugfs:
1722 iio_device_unregister_debugfs(indio_dev);
1723 return ret;
1724 }
1725 EXPORT_SYMBOL(__iio_device_register);
1726
1727 /**
1728 * iio_device_unregister() - unregister a device from the IIO subsystem
1729 * @indio_dev: Device structure representing the device.
1730 **/
1731 void iio_device_unregister(struct iio_dev *indio_dev)
1732 {
1733 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1734
1735 mutex_lock(&indio_dev->info_exist_lock);
1736
1737 iio_device_unregister_debugfs(indio_dev);
1738
1739 iio_disable_all_buffers(indio_dev);
1740
1741 indio_dev->info = NULL;
1742
1743 iio_device_wakeup_eventset(indio_dev);
1744 iio_buffer_wakeup_poll(indio_dev);
1745
1746 mutex_unlock(&indio_dev->info_exist_lock);
1747
1748 iio_buffer_free_sysfs_and_mask(indio_dev);
1749 }
1750 EXPORT_SYMBOL(iio_device_unregister);
1751
1752 static void devm_iio_device_unreg(struct device *dev, void *res)
1753 {
1754 iio_device_unregister(*(struct iio_dev **)res);
1755 }
1756
1757 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1758 struct module *this_mod)
1759 {
1760 struct iio_dev **ptr;
1761 int ret;
1762
1763 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1764 if (!ptr)
1765 return -ENOMEM;
1766
1767 *ptr = indio_dev;
1768 ret = __iio_device_register(indio_dev, this_mod);
1769 if (!ret)
1770 devres_add(dev, ptr);
1771 else
1772 devres_free(ptr);
1773
1774 return ret;
1775 }
1776 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1777
1778 /**
1779 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1780 * @dev: Device this iio_dev belongs to
1781 * @indio_dev: the iio_dev associated with the device
1782 *
1783 * Unregister iio_dev registered with devm_iio_device_register().
1784 */
1785 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1786 {
1787 int rc;
1788
1789 rc = devres_release(dev, devm_iio_device_unreg,
1790 devm_iio_device_match, indio_dev);
1791 WARN_ON(rc);
1792 }
1793 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1794
1795 /**
1796 * iio_device_claim_direct_mode - Keep device in direct mode
1797 * @indio_dev: the iio_dev associated with the device
1798 *
1799 * If the device is in direct mode it is guaranteed to stay
1800 * that way until iio_device_release_direct_mode() is called.
1801 *
1802 * Use with iio_device_release_direct_mode()
1803 *
1804 * Returns: 0 on success, -EBUSY on failure
1805 */
1806 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1807 {
1808 mutex_lock(&indio_dev->mlock);
1809
1810 if (iio_buffer_enabled(indio_dev)) {
1811 mutex_unlock(&indio_dev->mlock);
1812 return -EBUSY;
1813 }
1814 return 0;
1815 }
1816 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1817
1818 /**
1819 * iio_device_release_direct_mode - releases claim on direct mode
1820 * @indio_dev: the iio_dev associated with the device
1821 *
1822 * Release the claim. Device is no longer guaranteed to stay
1823 * in direct mode.
1824 *
1825 * Use with iio_device_claim_direct_mode()
1826 */
1827 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1828 {
1829 mutex_unlock(&indio_dev->mlock);
1830 }
1831 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1832
1833 subsys_initcall(iio_init);
1834 module_exit(iio_exit);
1835
1836 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1837 MODULE_DESCRIPTION("Industrial I/O core");
1838 MODULE_LICENSE("GPL");
Linux with added FPC-III support