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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob65ff0d0670188dbbfaf6835e5c2b660df16e97ae
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 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
165 };
166
167 /**
168 * iio_find_channel_from_si() - get channel from its scan index
169 * @indio_dev: device
170 * @si: scan index to match
171 */
172 const struct iio_chan_spec
173 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
174 {
175 int i;
176
177 for (i = 0; i < indio_dev->num_channels; i++)
178 if (indio_dev->channels[i].scan_index == si)
179 return &indio_dev->channels[i];
180 return NULL;
181 }
182
183 /* This turns up an awful lot */
184 ssize_t iio_read_const_attr(struct device *dev,
185 struct device_attribute *attr,
186 char *buf)
187 {
188 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
189 }
190 EXPORT_SYMBOL(iio_read_const_attr);
191
192 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
193 {
194 int ret;
195 const struct iio_event_interface *ev_int = indio_dev->event_interface;
196
197 ret = mutex_lock_interruptible(&indio_dev->mlock);
198 if (ret)
199 return ret;
200 if ((ev_int && iio_event_enabled(ev_int)) ||
201 iio_buffer_enabled(indio_dev)) {
202 mutex_unlock(&indio_dev->mlock);
203 return -EBUSY;
204 }
205 indio_dev->clock_id = clock_id;
206 mutex_unlock(&indio_dev->mlock);
207
208 return 0;
209 }
210
211 /**
212 * iio_get_time_ns() - utility function to get a time stamp for events etc
213 * @indio_dev: device
214 */
215 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
216 {
217 struct timespec64 tp;
218
219 switch (iio_device_get_clock(indio_dev)) {
220 case CLOCK_REALTIME:
221 return ktime_get_real_ns();
222 case CLOCK_MONOTONIC:
223 return ktime_get_ns();
224 case CLOCK_MONOTONIC_RAW:
225 return ktime_get_raw_ns();
226 case CLOCK_REALTIME_COARSE:
227 return ktime_to_ns(ktime_get_coarse_real());
228 case CLOCK_MONOTONIC_COARSE:
229 ktime_get_coarse_ts64(&tp);
230 return timespec64_to_ns(&tp);
231 case CLOCK_BOOTTIME:
232 return ktime_get_boottime_ns();
233 case CLOCK_TAI:
234 return ktime_get_clocktai_ns();
235 default:
236 BUG();
237 }
238 }
239 EXPORT_SYMBOL(iio_get_time_ns);
240
241 /**
242 * iio_get_time_res() - utility function to get time stamp clock resolution in
243 * nano seconds.
244 * @indio_dev: device
245 */
246 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
247 {
248 switch (iio_device_get_clock(indio_dev)) {
249 case CLOCK_REALTIME:
250 case CLOCK_MONOTONIC:
251 case CLOCK_MONOTONIC_RAW:
252 case CLOCK_BOOTTIME:
253 case CLOCK_TAI:
254 return hrtimer_resolution;
255 case CLOCK_REALTIME_COARSE:
256 case CLOCK_MONOTONIC_COARSE:
257 return LOW_RES_NSEC;
258 default:
259 BUG();
260 }
261 }
262 EXPORT_SYMBOL(iio_get_time_res);
263
264 static int __init iio_init(void)
265 {
266 int ret;
267
268 /* Register sysfs bus */
269 ret = bus_register(&iio_bus_type);
270 if (ret < 0) {
271 pr_err("could not register bus type\n");
272 goto error_nothing;
273 }
274
275 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
276 if (ret < 0) {
277 pr_err("failed to allocate char dev region\n");
278 goto error_unregister_bus_type;
279 }
280
281 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
282
283 return 0;
284
285 error_unregister_bus_type:
286 bus_unregister(&iio_bus_type);
287 error_nothing:
288 return ret;
289 }
290
291 static void __exit iio_exit(void)
292 {
293 if (iio_devt)
294 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
295 bus_unregister(&iio_bus_type);
296 debugfs_remove(iio_debugfs_dentry);
297 }
298
299 #if defined(CONFIG_DEBUG_FS)
300 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
301 size_t count, loff_t *ppos)
302 {
303 struct iio_dev *indio_dev = file->private_data;
304 char buf[20];
305 unsigned val = 0;
306 ssize_t len;
307 int ret;
308
309 ret = indio_dev->info->debugfs_reg_access(indio_dev,
310 indio_dev->cached_reg_addr,
311 0, &val);
312 if (ret) {
313 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
314 return ret;
315 }
316
317 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
318
319 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
320 }
321
322 static ssize_t iio_debugfs_write_reg(struct file *file,
323 const char __user *userbuf, size_t count, loff_t *ppos)
324 {
325 struct iio_dev *indio_dev = file->private_data;
326 unsigned reg, val;
327 char buf[80];
328 int ret;
329
330 count = min_t(size_t, count, (sizeof(buf)-1));
331 if (copy_from_user(buf, userbuf, count))
332 return -EFAULT;
333
334 buf[count] = 0;
335
336 ret = sscanf(buf, "%i %i", &reg, &val);
337
338 switch (ret) {
339 case 1:
340 indio_dev->cached_reg_addr = reg;
341 break;
342 case 2:
343 indio_dev->cached_reg_addr = reg;
344 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
345 val, NULL);
346 if (ret) {
347 dev_err(indio_dev->dev.parent, "%s: write failed\n",
348 __func__);
349 return ret;
350 }
351 break;
352 default:
353 return -EINVAL;
354 }
355
356 return count;
357 }
358
359 static const struct file_operations iio_debugfs_reg_fops = {
360 .open = simple_open,
361 .read = iio_debugfs_read_reg,
362 .write = iio_debugfs_write_reg,
363 };
364
365 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
366 {
367 debugfs_remove_recursive(indio_dev->debugfs_dentry);
368 }
369
370 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
371 {
372 if (indio_dev->info->debugfs_reg_access == NULL)
373 return;
374
375 if (!iio_debugfs_dentry)
376 return;
377
378 indio_dev->debugfs_dentry =
379 debugfs_create_dir(dev_name(&indio_dev->dev),
380 iio_debugfs_dentry);
381
382 debugfs_create_file("direct_reg_access", 0644,
383 indio_dev->debugfs_dentry, indio_dev,
384 &iio_debugfs_reg_fops);
385 }
386 #else
387 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
388 {
389 }
390
391 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
392 {
393 }
394 #endif /* CONFIG_DEBUG_FS */
395
396 static ssize_t iio_read_channel_ext_info(struct device *dev,
397 struct device_attribute *attr,
398 char *buf)
399 {
400 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
401 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
402 const struct iio_chan_spec_ext_info *ext_info;
403
404 ext_info = &this_attr->c->ext_info[this_attr->address];
405
406 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
407 }
408
409 static ssize_t iio_write_channel_ext_info(struct device *dev,
410 struct device_attribute *attr,
411 const char *buf,
412 size_t len)
413 {
414 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
415 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
416 const struct iio_chan_spec_ext_info *ext_info;
417
418 ext_info = &this_attr->c->ext_info[this_attr->address];
419
420 return ext_info->write(indio_dev, ext_info->private,
421 this_attr->c, buf, len);
422 }
423
424 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
425 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
426 {
427 const struct iio_enum *e = (const struct iio_enum *)priv;
428 unsigned int i;
429 size_t len = 0;
430
431 if (!e->num_items)
432 return 0;
433
434 for (i = 0; i < e->num_items; ++i)
435 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
436
437 /* replace last space with a newline */
438 buf[len - 1] = '\n';
439
440 return len;
441 }
442 EXPORT_SYMBOL_GPL(iio_enum_available_read);
443
444 ssize_t iio_enum_read(struct iio_dev *indio_dev,
445 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
446 {
447 const struct iio_enum *e = (const struct iio_enum *)priv;
448 int i;
449
450 if (!e->get)
451 return -EINVAL;
452
453 i = e->get(indio_dev, chan);
454 if (i < 0)
455 return i;
456 else if (i >= e->num_items)
457 return -EINVAL;
458
459 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
460 }
461 EXPORT_SYMBOL_GPL(iio_enum_read);
462
463 ssize_t iio_enum_write(struct iio_dev *indio_dev,
464 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
465 size_t len)
466 {
467 const struct iio_enum *e = (const struct iio_enum *)priv;
468 int ret;
469
470 if (!e->set)
471 return -EINVAL;
472
473 ret = __sysfs_match_string(e->items, e->num_items, buf);
474 if (ret < 0)
475 return ret;
476
477 ret = e->set(indio_dev, chan, ret);
478 return ret ? ret : len;
479 }
480 EXPORT_SYMBOL_GPL(iio_enum_write);
481
482 static const struct iio_mount_matrix iio_mount_idmatrix = {
483 .rotation = {
484 "1", "0", "0",
485 "0", "1", "0",
486 "0", "0", "1"
487 }
488 };
489
490 static int iio_setup_mount_idmatrix(const struct device *dev,
491 struct iio_mount_matrix *matrix)
492 {
493 *matrix = iio_mount_idmatrix;
494 dev_info(dev, "mounting matrix not found: using identity...\n");
495 return 0;
496 }
497
498 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
499 const struct iio_chan_spec *chan, char *buf)
500 {
501 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
502 priv)(indio_dev, chan);
503
504 if (IS_ERR(mtx))
505 return PTR_ERR(mtx);
506
507 if (!mtx)
508 mtx = &iio_mount_idmatrix;
509
510 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
511 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
512 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
513 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
514 }
515 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
516
517 /**
518 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
519 * device "mount-matrix" property
520 * @dev: device the mounting matrix property is assigned to
521 * @propname: device specific mounting matrix property name
522 * @matrix: where to store retrieved matrix
523 *
524 * If device is assigned no mounting matrix property, a default 3x3 identity
525 * matrix will be filled in.
526 *
527 * Return: 0 if success, or a negative error code on failure.
528 */
529 int iio_read_mount_matrix(struct device *dev, const char *propname,
530 struct iio_mount_matrix *matrix)
531 {
532 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
533 int err;
534
535 err = device_property_read_string_array(dev, propname,
536 matrix->rotation, len);
537 if (err == len)
538 return 0;
539
540 if (err >= 0)
541 /* Invalid number of matrix entries. */
542 return -EINVAL;
543
544 if (err != -EINVAL)
545 /* Invalid matrix declaration format. */
546 return err;
547
548 /* Matrix was not declared at all: fallback to identity. */
549 return iio_setup_mount_idmatrix(dev, matrix);
550 }
551 EXPORT_SYMBOL(iio_read_mount_matrix);
552
553 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
554 int size, const int *vals)
555 {
556 unsigned long long tmp;
557 int tmp0, tmp1;
558 bool scale_db = false;
559
560 switch (type) {
561 case IIO_VAL_INT:
562 return snprintf(buf, len, "%d", vals[0]);
563 case IIO_VAL_INT_PLUS_MICRO_DB:
564 scale_db = true;
565 /* fall through */
566 case IIO_VAL_INT_PLUS_MICRO:
567 if (vals[1] < 0)
568 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
569 -vals[1], scale_db ? " dB" : "");
570 else
571 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
572 scale_db ? " dB" : "");
573 case IIO_VAL_INT_PLUS_NANO:
574 if (vals[1] < 0)
575 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
576 -vals[1]);
577 else
578 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
579 case IIO_VAL_FRACTIONAL:
580 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
581 tmp1 = vals[1];
582 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
583 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
584 case IIO_VAL_FRACTIONAL_LOG2:
585 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
586 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
587 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
588 case IIO_VAL_INT_MULTIPLE:
589 {
590 int i;
591 int l = 0;
592
593 for (i = 0; i < size; ++i) {
594 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
595 if (l >= len)
596 break;
597 }
598 return l;
599 }
600 case IIO_VAL_CHAR:
601 return snprintf(buf, len, "%c", (char)vals[0]);
602 default:
603 return 0;
604 }
605 }
606
607 /**
608 * iio_format_value() - Formats a IIO value into its string representation
609 * @buf: The buffer to which the formatted value gets written
610 * which is assumed to be big enough (i.e. PAGE_SIZE).
611 * @type: One of the IIO_VAL_* constants. This decides how the val
612 * and val2 parameters are formatted.
613 * @size: Number of IIO value entries contained in vals
614 * @vals: Pointer to the values, exact meaning depends on the
615 * type parameter.
616 *
617 * Return: 0 by default, a negative number on failure or the
618 * total number of characters written for a type that belongs
619 * to the IIO_VAL_* constant.
620 */
621 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
622 {
623 ssize_t len;
624
625 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
626 if (len >= PAGE_SIZE - 1)
627 return -EFBIG;
628
629 return len + sprintf(buf + len, "\n");
630 }
631 EXPORT_SYMBOL_GPL(iio_format_value);
632
633 static ssize_t iio_read_channel_info(struct device *dev,
634 struct device_attribute *attr,
635 char *buf)
636 {
637 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
638 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
639 int vals[INDIO_MAX_RAW_ELEMENTS];
640 int ret;
641 int val_len = 2;
642
643 if (indio_dev->info->read_raw_multi)
644 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
645 INDIO_MAX_RAW_ELEMENTS,
646 vals, &val_len,
647 this_attr->address);
648 else
649 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
650 &vals[0], &vals[1], this_attr->address);
651
652 if (ret < 0)
653 return ret;
654
655 return iio_format_value(buf, ret, val_len, vals);
656 }
657
658 static ssize_t iio_format_avail_list(char *buf, const int *vals,
659 int type, int length)
660 {
661 int i;
662 ssize_t len = 0;
663
664 switch (type) {
665 case IIO_VAL_INT:
666 for (i = 0; i < length; i++) {
667 len += __iio_format_value(buf + len, PAGE_SIZE - len,
668 type, 1, &vals[i]);
669 if (len >= PAGE_SIZE)
670 return -EFBIG;
671 if (i < length - 1)
672 len += snprintf(buf + len, PAGE_SIZE - len,
673 " ");
674 else
675 len += snprintf(buf + len, PAGE_SIZE - len,
676 "\n");
677 if (len >= PAGE_SIZE)
678 return -EFBIG;
679 }
680 break;
681 default:
682 for (i = 0; i < length / 2; i++) {
683 len += __iio_format_value(buf + len, PAGE_SIZE - len,
684 type, 2, &vals[i * 2]);
685 if (len >= PAGE_SIZE)
686 return -EFBIG;
687 if (i < length / 2 - 1)
688 len += snprintf(buf + len, PAGE_SIZE - len,
689 " ");
690 else
691 len += snprintf(buf + len, PAGE_SIZE - len,
692 "\n");
693 if (len >= PAGE_SIZE)
694 return -EFBIG;
695 }
696 }
697
698 return len;
699 }
700
701 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
702 {
703 int i;
704 ssize_t len;
705
706 len = snprintf(buf, PAGE_SIZE, "[");
707 switch (type) {
708 case IIO_VAL_INT:
709 for (i = 0; i < 3; i++) {
710 len += __iio_format_value(buf + len, PAGE_SIZE - len,
711 type, 1, &vals[i]);
712 if (len >= PAGE_SIZE)
713 return -EFBIG;
714 if (i < 2)
715 len += snprintf(buf + len, PAGE_SIZE - len,
716 " ");
717 else
718 len += snprintf(buf + len, PAGE_SIZE - len,
719 "]\n");
720 if (len >= PAGE_SIZE)
721 return -EFBIG;
722 }
723 break;
724 default:
725 for (i = 0; i < 3; i++) {
726 len += __iio_format_value(buf + len, PAGE_SIZE - len,
727 type, 2, &vals[i * 2]);
728 if (len >= PAGE_SIZE)
729 return -EFBIG;
730 if (i < 2)
731 len += snprintf(buf + len, PAGE_SIZE - len,
732 " ");
733 else
734 len += snprintf(buf + len, PAGE_SIZE - len,
735 "]\n");
736 if (len >= PAGE_SIZE)
737 return -EFBIG;
738 }
739 }
740
741 return len;
742 }
743
744 static ssize_t iio_read_channel_info_avail(struct device *dev,
745 struct device_attribute *attr,
746 char *buf)
747 {
748 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
749 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
750 const int *vals;
751 int ret;
752 int length;
753 int type;
754
755 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
756 &vals, &type, &length,
757 this_attr->address);
758
759 if (ret < 0)
760 return ret;
761 switch (ret) {
762 case IIO_AVAIL_LIST:
763 return iio_format_avail_list(buf, vals, type, length);
764 case IIO_AVAIL_RANGE:
765 return iio_format_avail_range(buf, vals, type);
766 default:
767 return -EINVAL;
768 }
769 }
770
771 /**
772 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
773 * @str: The string to parse
774 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
775 * @integer: The integer part of the number
776 * @fract: The fractional part of the number
777 *
778 * Returns 0 on success, or a negative error code if the string could not be
779 * parsed.
780 */
781 int iio_str_to_fixpoint(const char *str, int fract_mult,
782 int *integer, int *fract)
783 {
784 int i = 0, f = 0;
785 bool integer_part = true, negative = false;
786
787 if (fract_mult == 0) {
788 *fract = 0;
789
790 return kstrtoint(str, 0, integer);
791 }
792
793 if (str[0] == '-') {
794 negative = true;
795 str++;
796 } else if (str[0] == '+') {
797 str++;
798 }
799
800 while (*str) {
801 if ('0' <= *str && *str <= '9') {
802 if (integer_part) {
803 i = i * 10 + *str - '0';
804 } else {
805 f += fract_mult * (*str - '0');
806 fract_mult /= 10;
807 }
808 } else if (*str == '\n') {
809 if (*(str + 1) == '\0')
810 break;
811 else
812 return -EINVAL;
813 } else if (*str == '.' && integer_part) {
814 integer_part = false;
815 } else {
816 return -EINVAL;
817 }
818 str++;
819 }
820
821 if (negative) {
822 if (i)
823 i = -i;
824 else
825 f = -f;
826 }
827
828 *integer = i;
829 *fract = f;
830
831 return 0;
832 }
833 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
834
835 static ssize_t iio_write_channel_info(struct device *dev,
836 struct device_attribute *attr,
837 const char *buf,
838 size_t len)
839 {
840 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
841 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
842 int ret, fract_mult = 100000;
843 int integer, fract = 0;
844 bool is_char = false;
845
846 /* Assumes decimal - precision based on number of digits */
847 if (!indio_dev->info->write_raw)
848 return -EINVAL;
849
850 if (indio_dev->info->write_raw_get_fmt)
851 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
852 this_attr->c, this_attr->address)) {
853 case IIO_VAL_INT:
854 fract_mult = 0;
855 break;
856 case IIO_VAL_INT_PLUS_MICRO:
857 fract_mult = 100000;
858 break;
859 case IIO_VAL_INT_PLUS_NANO:
860 fract_mult = 100000000;
861 break;
862 case IIO_VAL_CHAR:
863 is_char = true;
864 break;
865 default:
866 return -EINVAL;
867 }
868
869 if (is_char) {
870 char ch;
871
872 if (sscanf(buf, "%c", &ch) != 1)
873 return -EINVAL;
874 integer = ch;
875 } else {
876 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
877 if (ret)
878 return ret;
879 }
880
881 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
882 integer, fract, this_attr->address);
883 if (ret)
884 return ret;
885
886 return len;
887 }
888
889 static
890 int __iio_device_attr_init(struct device_attribute *dev_attr,
891 const char *postfix,
892 struct iio_chan_spec const *chan,
893 ssize_t (*readfunc)(struct device *dev,
894 struct device_attribute *attr,
895 char *buf),
896 ssize_t (*writefunc)(struct device *dev,
897 struct device_attribute *attr,
898 const char *buf,
899 size_t len),
900 enum iio_shared_by shared_by)
901 {
902 int ret = 0;
903 char *name = NULL;
904 char *full_postfix;
905 sysfs_attr_init(&dev_attr->attr);
906
907 /* Build up postfix of <extend_name>_<modifier>_postfix */
908 if (chan->modified && (shared_by == IIO_SEPARATE)) {
909 if (chan->extend_name)
910 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
911 iio_modifier_names[chan
912 ->channel2],
913 chan->extend_name,
914 postfix);
915 else
916 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
917 iio_modifier_names[chan
918 ->channel2],
919 postfix);
920 } else {
921 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
922 full_postfix = kstrdup(postfix, GFP_KERNEL);
923 else
924 full_postfix = kasprintf(GFP_KERNEL,
925 "%s_%s",
926 chan->extend_name,
927 postfix);
928 }
929 if (full_postfix == NULL)
930 return -ENOMEM;
931
932 if (chan->differential) { /* Differential can not have modifier */
933 switch (shared_by) {
934 case IIO_SHARED_BY_ALL:
935 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
936 break;
937 case IIO_SHARED_BY_DIR:
938 name = kasprintf(GFP_KERNEL, "%s_%s",
939 iio_direction[chan->output],
940 full_postfix);
941 break;
942 case IIO_SHARED_BY_TYPE:
943 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
944 iio_direction[chan->output],
945 iio_chan_type_name_spec[chan->type],
946 iio_chan_type_name_spec[chan->type],
947 full_postfix);
948 break;
949 case IIO_SEPARATE:
950 if (!chan->indexed) {
951 WARN(1, "Differential channels must be indexed\n");
952 ret = -EINVAL;
953 goto error_free_full_postfix;
954 }
955 name = kasprintf(GFP_KERNEL,
956 "%s_%s%d-%s%d_%s",
957 iio_direction[chan->output],
958 iio_chan_type_name_spec[chan->type],
959 chan->channel,
960 iio_chan_type_name_spec[chan->type],
961 chan->channel2,
962 full_postfix);
963 break;
964 }
965 } else { /* Single ended */
966 switch (shared_by) {
967 case IIO_SHARED_BY_ALL:
968 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
969 break;
970 case IIO_SHARED_BY_DIR:
971 name = kasprintf(GFP_KERNEL, "%s_%s",
972 iio_direction[chan->output],
973 full_postfix);
974 break;
975 case IIO_SHARED_BY_TYPE:
976 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
977 iio_direction[chan->output],
978 iio_chan_type_name_spec[chan->type],
979 full_postfix);
980 break;
981
982 case IIO_SEPARATE:
983 if (chan->indexed)
984 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
985 iio_direction[chan->output],
986 iio_chan_type_name_spec[chan->type],
987 chan->channel,
988 full_postfix);
989 else
990 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
991 iio_direction[chan->output],
992 iio_chan_type_name_spec[chan->type],
993 full_postfix);
994 break;
995 }
996 }
997 if (name == NULL) {
998 ret = -ENOMEM;
999 goto error_free_full_postfix;
1000 }
1001 dev_attr->attr.name = name;
1002
1003 if (readfunc) {
1004 dev_attr->attr.mode |= S_IRUGO;
1005 dev_attr->show = readfunc;
1006 }
1007
1008 if (writefunc) {
1009 dev_attr->attr.mode |= S_IWUSR;
1010 dev_attr->store = writefunc;
1011 }
1012
1013 error_free_full_postfix:
1014 kfree(full_postfix);
1015
1016 return ret;
1017 }
1018
1019 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1020 {
1021 kfree(dev_attr->attr.name);
1022 }
1023
1024 int __iio_add_chan_devattr(const char *postfix,
1025 struct iio_chan_spec const *chan,
1026 ssize_t (*readfunc)(struct device *dev,
1027 struct device_attribute *attr,
1028 char *buf),
1029 ssize_t (*writefunc)(struct device *dev,
1030 struct device_attribute *attr,
1031 const char *buf,
1032 size_t len),
1033 u64 mask,
1034 enum iio_shared_by shared_by,
1035 struct device *dev,
1036 struct list_head *attr_list)
1037 {
1038 int ret;
1039 struct iio_dev_attr *iio_attr, *t;
1040
1041 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1042 if (iio_attr == NULL)
1043 return -ENOMEM;
1044 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1045 postfix, chan,
1046 readfunc, writefunc, shared_by);
1047 if (ret)
1048 goto error_iio_dev_attr_free;
1049 iio_attr->c = chan;
1050 iio_attr->address = mask;
1051 list_for_each_entry(t, attr_list, l)
1052 if (strcmp(t->dev_attr.attr.name,
1053 iio_attr->dev_attr.attr.name) == 0) {
1054 if (shared_by == IIO_SEPARATE)
1055 dev_err(dev, "tried to double register : %s\n",
1056 t->dev_attr.attr.name);
1057 ret = -EBUSY;
1058 goto error_device_attr_deinit;
1059 }
1060 list_add(&iio_attr->l, attr_list);
1061
1062 return 0;
1063
1064 error_device_attr_deinit:
1065 __iio_device_attr_deinit(&iio_attr->dev_attr);
1066 error_iio_dev_attr_free:
1067 kfree(iio_attr);
1068 return ret;
1069 }
1070
1071 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1072 struct iio_chan_spec const *chan,
1073 enum iio_shared_by shared_by,
1074 const long *infomask)
1075 {
1076 int i, ret, attrcount = 0;
1077
1078 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1079 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1080 return -EINVAL;
1081 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1082 chan,
1083 &iio_read_channel_info,
1084 &iio_write_channel_info,
1085 i,
1086 shared_by,
1087 &indio_dev->dev,
1088 &indio_dev->channel_attr_list);
1089 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1090 continue;
1091 else if (ret < 0)
1092 return ret;
1093 attrcount++;
1094 }
1095
1096 return attrcount;
1097 }
1098
1099 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1100 struct iio_chan_spec const *chan,
1101 enum iio_shared_by shared_by,
1102 const long *infomask)
1103 {
1104 int i, ret, attrcount = 0;
1105 char *avail_postfix;
1106
1107 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1108 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1109 return -EINVAL;
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_dev_label(struct device *dev,
1257 struct device_attribute *attr,
1258 char *buf)
1259 {
1260 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1261 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1262 }
1263
1264 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1265
1266 static ssize_t iio_show_timestamp_clock(struct device *dev,
1267 struct device_attribute *attr,
1268 char *buf)
1269 {
1270 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1271 const clockid_t clk = iio_device_get_clock(indio_dev);
1272 const char *name;
1273 ssize_t sz;
1274
1275 switch (clk) {
1276 case CLOCK_REALTIME:
1277 name = "realtime\n";
1278 sz = sizeof("realtime\n");
1279 break;
1280 case CLOCK_MONOTONIC:
1281 name = "monotonic\n";
1282 sz = sizeof("monotonic\n");
1283 break;
1284 case CLOCK_MONOTONIC_RAW:
1285 name = "monotonic_raw\n";
1286 sz = sizeof("monotonic_raw\n");
1287 break;
1288 case CLOCK_REALTIME_COARSE:
1289 name = "realtime_coarse\n";
1290 sz = sizeof("realtime_coarse\n");
1291 break;
1292 case CLOCK_MONOTONIC_COARSE:
1293 name = "monotonic_coarse\n";
1294 sz = sizeof("monotonic_coarse\n");
1295 break;
1296 case CLOCK_BOOTTIME:
1297 name = "boottime\n";
1298 sz = sizeof("boottime\n");
1299 break;
1300 case CLOCK_TAI:
1301 name = "tai\n";
1302 sz = sizeof("tai\n");
1303 break;
1304 default:
1305 BUG();
1306 }
1307
1308 memcpy(buf, name, sz);
1309 return sz;
1310 }
1311
1312 static ssize_t iio_store_timestamp_clock(struct device *dev,
1313 struct device_attribute *attr,
1314 const char *buf, size_t len)
1315 {
1316 clockid_t clk;
1317 int ret;
1318
1319 if (sysfs_streq(buf, "realtime"))
1320 clk = CLOCK_REALTIME;
1321 else if (sysfs_streq(buf, "monotonic"))
1322 clk = CLOCK_MONOTONIC;
1323 else if (sysfs_streq(buf, "monotonic_raw"))
1324 clk = CLOCK_MONOTONIC_RAW;
1325 else if (sysfs_streq(buf, "realtime_coarse"))
1326 clk = CLOCK_REALTIME_COARSE;
1327 else if (sysfs_streq(buf, "monotonic_coarse"))
1328 clk = CLOCK_MONOTONIC_COARSE;
1329 else if (sysfs_streq(buf, "boottime"))
1330 clk = CLOCK_BOOTTIME;
1331 else if (sysfs_streq(buf, "tai"))
1332 clk = CLOCK_TAI;
1333 else
1334 return -EINVAL;
1335
1336 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1337 if (ret)
1338 return ret;
1339
1340 return len;
1341 }
1342
1343 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1344 iio_show_timestamp_clock, iio_store_timestamp_clock);
1345
1346 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1347 {
1348 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1349 struct iio_dev_attr *p;
1350 struct attribute **attr, *clk = NULL;
1351
1352 /* First count elements in any existing group */
1353 if (indio_dev->info->attrs) {
1354 attr = indio_dev->info->attrs->attrs;
1355 while (*attr++ != NULL)
1356 attrcount_orig++;
1357 }
1358 attrcount = attrcount_orig;
1359 /*
1360 * New channel registration method - relies on the fact a group does
1361 * not need to be initialized if its name is NULL.
1362 */
1363 if (indio_dev->channels)
1364 for (i = 0; i < indio_dev->num_channels; i++) {
1365 const struct iio_chan_spec *chan =
1366 &indio_dev->channels[i];
1367
1368 if (chan->type == IIO_TIMESTAMP)
1369 clk = &dev_attr_current_timestamp_clock.attr;
1370
1371 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1372 if (ret < 0)
1373 goto error_clear_attrs;
1374 attrcount += ret;
1375 }
1376
1377 if (indio_dev->event_interface)
1378 clk = &dev_attr_current_timestamp_clock.attr;
1379
1380 if (indio_dev->name)
1381 attrcount++;
1382 if (indio_dev->label)
1383 attrcount++;
1384 if (clk)
1385 attrcount++;
1386
1387 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1388 sizeof(indio_dev->chan_attr_group.attrs[0]),
1389 GFP_KERNEL);
1390 if (indio_dev->chan_attr_group.attrs == NULL) {
1391 ret = -ENOMEM;
1392 goto error_clear_attrs;
1393 }
1394 /* Copy across original attributes */
1395 if (indio_dev->info->attrs)
1396 memcpy(indio_dev->chan_attr_group.attrs,
1397 indio_dev->info->attrs->attrs,
1398 sizeof(indio_dev->chan_attr_group.attrs[0])
1399 *attrcount_orig);
1400 attrn = attrcount_orig;
1401 /* Add all elements from the list. */
1402 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1403 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1404 if (indio_dev->name)
1405 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1406 if (indio_dev->label)
1407 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
1408 if (clk)
1409 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1410
1411 indio_dev->groups[indio_dev->groupcounter++] =
1412 &indio_dev->chan_attr_group;
1413
1414 return 0;
1415
1416 error_clear_attrs:
1417 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1418
1419 return ret;
1420 }
1421
1422 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1423 {
1424
1425 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1426 kfree(indio_dev->chan_attr_group.attrs);
1427 indio_dev->chan_attr_group.attrs = NULL;
1428 }
1429
1430 static void iio_dev_release(struct device *device)
1431 {
1432 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1433 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1434 iio_device_unregister_trigger_consumer(indio_dev);
1435 iio_device_unregister_eventset(indio_dev);
1436 iio_device_unregister_sysfs(indio_dev);
1437
1438 iio_buffer_put(indio_dev->buffer);
1439
1440 ida_simple_remove(&iio_ida, indio_dev->id);
1441 kfree(indio_dev);
1442 }
1443
1444 struct device_type iio_device_type = {
1445 .name = "iio_device",
1446 .release = iio_dev_release,
1447 };
1448
1449 /**
1450 * iio_device_alloc() - allocate an iio_dev from a driver
1451 * @sizeof_priv: Space to allocate for private structure.
1452 **/
1453 struct iio_dev *iio_device_alloc(int sizeof_priv)
1454 {
1455 struct iio_dev *dev;
1456 size_t alloc_size;
1457
1458 alloc_size = sizeof(struct iio_dev);
1459 if (sizeof_priv) {
1460 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1461 alloc_size += sizeof_priv;
1462 }
1463 /* ensure 32-byte alignment of whole construct ? */
1464 alloc_size += IIO_ALIGN - 1;
1465
1466 dev = kzalloc(alloc_size, GFP_KERNEL);
1467
1468 if (dev) {
1469 dev->dev.groups = dev->groups;
1470 dev->dev.type = &iio_device_type;
1471 dev->dev.bus = &iio_bus_type;
1472 device_initialize(&dev->dev);
1473 dev_set_drvdata(&dev->dev, (void *)dev);
1474 mutex_init(&dev->mlock);
1475 mutex_init(&dev->info_exist_lock);
1476 INIT_LIST_HEAD(&dev->channel_attr_list);
1477
1478 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1479 if (dev->id < 0) {
1480 /* cannot use a dev_err as the name isn't available */
1481 pr_err("failed to get device id\n");
1482 kfree(dev);
1483 return NULL;
1484 }
1485 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1486 INIT_LIST_HEAD(&dev->buffer_list);
1487 }
1488
1489 return dev;
1490 }
1491 EXPORT_SYMBOL(iio_device_alloc);
1492
1493 /**
1494 * iio_device_free() - free an iio_dev from a driver
1495 * @dev: the iio_dev associated with the device
1496 **/
1497 void iio_device_free(struct iio_dev *dev)
1498 {
1499 if (dev)
1500 put_device(&dev->dev);
1501 }
1502 EXPORT_SYMBOL(iio_device_free);
1503
1504 static void devm_iio_device_release(struct device *dev, void *res)
1505 {
1506 iio_device_free(*(struct iio_dev **)res);
1507 }
1508
1509 int devm_iio_device_match(struct device *dev, void *res, void *data)
1510 {
1511 struct iio_dev **r = res;
1512 if (!r || !*r) {
1513 WARN_ON(!r || !*r);
1514 return 0;
1515 }
1516 return *r == data;
1517 }
1518 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1519
1520 /**
1521 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1522 * @dev: Device to allocate iio_dev for
1523 * @sizeof_priv: Space to allocate for private structure.
1524 *
1525 * Managed iio_device_alloc. iio_dev allocated with this function is
1526 * automatically freed on driver detach.
1527 *
1528 * If an iio_dev allocated with this function needs to be freed separately,
1529 * devm_iio_device_free() must be used.
1530 *
1531 * RETURNS:
1532 * Pointer to allocated iio_dev on success, NULL on failure.
1533 */
1534 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1535 {
1536 struct iio_dev **ptr, *iio_dev;
1537
1538 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1539 GFP_KERNEL);
1540 if (!ptr)
1541 return NULL;
1542
1543 iio_dev = iio_device_alloc(sizeof_priv);
1544 if (iio_dev) {
1545 *ptr = iio_dev;
1546 devres_add(dev, ptr);
1547 } else {
1548 devres_free(ptr);
1549 }
1550
1551 return iio_dev;
1552 }
1553 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1554
1555 /**
1556 * devm_iio_device_free - Resource-managed iio_device_free()
1557 * @dev: Device this iio_dev belongs to
1558 * @iio_dev: the iio_dev associated with the device
1559 *
1560 * Free iio_dev allocated with devm_iio_device_alloc().
1561 */
1562 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1563 {
1564 int rc;
1565
1566 rc = devres_release(dev, devm_iio_device_release,
1567 devm_iio_device_match, iio_dev);
1568 WARN_ON(rc);
1569 }
1570 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1571
1572 /**
1573 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1574 * @inode: Inode structure for identifying the device in the file system
1575 * @filp: File structure for iio device used to keep and later access
1576 * private data
1577 *
1578 * Return: 0 on success or -EBUSY if the device is already opened
1579 **/
1580 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1581 {
1582 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1583 struct iio_dev, chrdev);
1584
1585 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1586 return -EBUSY;
1587
1588 iio_device_get(indio_dev);
1589
1590 filp->private_data = indio_dev;
1591
1592 return 0;
1593 }
1594
1595 /**
1596 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1597 * @inode: Inode structure pointer for the char device
1598 * @filp: File structure pointer for the char device
1599 *
1600 * Return: 0 for successful release
1601 */
1602 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1603 {
1604 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1605 struct iio_dev, chrdev);
1606 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1607 iio_device_put(indio_dev);
1608
1609 return 0;
1610 }
1611
1612 /* Somewhat of a cross file organization violation - ioctls here are actually
1613 * event related */
1614 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1615 {
1616 struct iio_dev *indio_dev = filp->private_data;
1617 int __user *ip = (int __user *)arg;
1618 int fd;
1619
1620 if (!indio_dev->info)
1621 return -ENODEV;
1622
1623 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1624 fd = iio_event_getfd(indio_dev);
1625 if (fd < 0)
1626 return fd;
1627 if (copy_to_user(ip, &fd, sizeof(fd)))
1628 return -EFAULT;
1629 return 0;
1630 }
1631 return -EINVAL;
1632 }
1633
1634 static const struct file_operations iio_buffer_fileops = {
1635 .read = iio_buffer_read_outer_addr,
1636 .release = iio_chrdev_release,
1637 .open = iio_chrdev_open,
1638 .poll = iio_buffer_poll_addr,
1639 .owner = THIS_MODULE,
1640 .llseek = noop_llseek,
1641 .unlocked_ioctl = iio_ioctl,
1642 .compat_ioctl = compat_ptr_ioctl,
1643 };
1644
1645 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1646 {
1647 int i, j;
1648 const struct iio_chan_spec *channels = indio_dev->channels;
1649
1650 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1651 return 0;
1652
1653 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1654 if (channels[i].scan_index < 0)
1655 continue;
1656 for (j = i + 1; j < indio_dev->num_channels; j++)
1657 if (channels[i].scan_index == channels[j].scan_index) {
1658 dev_err(&indio_dev->dev,
1659 "Duplicate scan index %d\n",
1660 channels[i].scan_index);
1661 return -EINVAL;
1662 }
1663 }
1664
1665 return 0;
1666 }
1667
1668 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1669
1670 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1671 {
1672 int ret;
1673
1674 indio_dev->driver_module = this_mod;
1675 /* If the calling driver did not initialize of_node, do it here */
1676 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1677 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1678
1679 indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1680 NULL);
1681
1682 ret = iio_check_unique_scan_index(indio_dev);
1683 if (ret < 0)
1684 return ret;
1685
1686 if (!indio_dev->info)
1687 return -EINVAL;
1688
1689 /* configure elements for the chrdev */
1690 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1691
1692 iio_device_register_debugfs(indio_dev);
1693
1694 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1695 if (ret) {
1696 dev_err(indio_dev->dev.parent,
1697 "Failed to create buffer sysfs interfaces\n");
1698 goto error_unreg_debugfs;
1699 }
1700
1701 ret = iio_device_register_sysfs(indio_dev);
1702 if (ret) {
1703 dev_err(indio_dev->dev.parent,
1704 "Failed to register sysfs interfaces\n");
1705 goto error_buffer_free_sysfs;
1706 }
1707 ret = iio_device_register_eventset(indio_dev);
1708 if (ret) {
1709 dev_err(indio_dev->dev.parent,
1710 "Failed to register event set\n");
1711 goto error_free_sysfs;
1712 }
1713 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1714 iio_device_register_trigger_consumer(indio_dev);
1715
1716 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1717 indio_dev->setup_ops == NULL)
1718 indio_dev->setup_ops = &noop_ring_setup_ops;
1719
1720 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1721
1722 indio_dev->chrdev.owner = this_mod;
1723
1724 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1725 if (ret < 0)
1726 goto error_unreg_eventset;
1727
1728 return 0;
1729
1730 error_unreg_eventset:
1731 iio_device_unregister_eventset(indio_dev);
1732 error_free_sysfs:
1733 iio_device_unregister_sysfs(indio_dev);
1734 error_buffer_free_sysfs:
1735 iio_buffer_free_sysfs_and_mask(indio_dev);
1736 error_unreg_debugfs:
1737 iio_device_unregister_debugfs(indio_dev);
1738 return ret;
1739 }
1740 EXPORT_SYMBOL(__iio_device_register);
1741
1742 /**
1743 * iio_device_unregister() - unregister a device from the IIO subsystem
1744 * @indio_dev: Device structure representing the device.
1745 **/
1746 void iio_device_unregister(struct iio_dev *indio_dev)
1747 {
1748 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1749
1750 mutex_lock(&indio_dev->info_exist_lock);
1751
1752 iio_device_unregister_debugfs(indio_dev);
1753
1754 iio_disable_all_buffers(indio_dev);
1755
1756 indio_dev->info = NULL;
1757
1758 iio_device_wakeup_eventset(indio_dev);
1759 iio_buffer_wakeup_poll(indio_dev);
1760
1761 mutex_unlock(&indio_dev->info_exist_lock);
1762
1763 iio_buffer_free_sysfs_and_mask(indio_dev);
1764 }
1765 EXPORT_SYMBOL(iio_device_unregister);
1766
1767 static void devm_iio_device_unreg(struct device *dev, void *res)
1768 {
1769 iio_device_unregister(*(struct iio_dev **)res);
1770 }
1771
1772 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1773 struct module *this_mod)
1774 {
1775 struct iio_dev **ptr;
1776 int ret;
1777
1778 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1779 if (!ptr)
1780 return -ENOMEM;
1781
1782 *ptr = indio_dev;
1783 ret = __iio_device_register(indio_dev, this_mod);
1784 if (!ret)
1785 devres_add(dev, ptr);
1786 else
1787 devres_free(ptr);
1788
1789 return ret;
1790 }
1791 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1792
1793 /**
1794 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1795 * @dev: Device this iio_dev belongs to
1796 * @indio_dev: the iio_dev associated with the device
1797 *
1798 * Unregister iio_dev registered with devm_iio_device_register().
1799 */
1800 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1801 {
1802 int rc;
1803
1804 rc = devres_release(dev, devm_iio_device_unreg,
1805 devm_iio_device_match, indio_dev);
1806 WARN_ON(rc);
1807 }
1808 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1809
1810 /**
1811 * iio_device_claim_direct_mode - Keep device in direct mode
1812 * @indio_dev: the iio_dev associated with the device
1813 *
1814 * If the device is in direct mode it is guaranteed to stay
1815 * that way until iio_device_release_direct_mode() is called.
1816 *
1817 * Use with iio_device_release_direct_mode()
1818 *
1819 * Returns: 0 on success, -EBUSY on failure
1820 */
1821 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1822 {
1823 mutex_lock(&indio_dev->mlock);
1824
1825 if (iio_buffer_enabled(indio_dev)) {
1826 mutex_unlock(&indio_dev->mlock);
1827 return -EBUSY;
1828 }
1829 return 0;
1830 }
1831 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1832
1833 /**
1834 * iio_device_release_direct_mode - releases claim on direct mode
1835 * @indio_dev: the iio_dev associated with the device
1836 *
1837 * Release the claim. Device is no longer guaranteed to stay
1838 * in direct mode.
1839 *
1840 * Use with iio_device_claim_direct_mode()
1841 */
1842 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1843 {
1844 mutex_unlock(&indio_dev->mlock);
1845 }
1846 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1847
1848 subsys_initcall(iio_init);
1849 module_exit(iio_exit);
1850
1851 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1852 MODULE_DESCRIPTION("Industrial I/O core");
1853 MODULE_LICENSE("GPL");
Linux with added FPC-III support