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spi: sprd: adi: Add a reset reason for watchdog mode
[linux/fpc-iii.git] / drivers / iio / industrialio-core.c
blob524a686077ca6d3f3b0765e8cf0c0b96d0bcf6af
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_boottime_ns();
232 case CLOCK_TAI:
233 return ktime_get_clocktai_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 void iio_device_register_debugfs(struct iio_dev *indio_dev)
370 {
371 if (indio_dev->info->debugfs_reg_access == NULL)
372 return;
373
374 if (!iio_debugfs_dentry)
375 return;
376
377 indio_dev->debugfs_dentry =
378 debugfs_create_dir(dev_name(&indio_dev->dev),
379 iio_debugfs_dentry);
380
381 debugfs_create_file("direct_reg_access", 0644,
382 indio_dev->debugfs_dentry, indio_dev,
383 &iio_debugfs_reg_fops);
384 }
385 #else
386 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
387 {
388 }
389
390 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
391 {
392 }
393 #endif /* CONFIG_DEBUG_FS */
394
395 static ssize_t iio_read_channel_ext_info(struct device *dev,
396 struct device_attribute *attr,
397 char *buf)
398 {
399 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
400 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
401 const struct iio_chan_spec_ext_info *ext_info;
402
403 ext_info = &this_attr->c->ext_info[this_attr->address];
404
405 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
406 }
407
408 static ssize_t iio_write_channel_ext_info(struct device *dev,
409 struct device_attribute *attr,
410 const char *buf,
411 size_t len)
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->write(indio_dev, ext_info->private,
420 this_attr->c, buf, len);
421 }
422
423 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
424 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
425 {
426 const struct iio_enum *e = (const struct iio_enum *)priv;
427 unsigned int i;
428 size_t len = 0;
429
430 if (!e->num_items)
431 return 0;
432
433 for (i = 0; i < e->num_items; ++i)
434 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
435
436 /* replace last space with a newline */
437 buf[len - 1] = '\n';
438
439 return len;
440 }
441 EXPORT_SYMBOL_GPL(iio_enum_available_read);
442
443 ssize_t iio_enum_read(struct iio_dev *indio_dev,
444 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
445 {
446 const struct iio_enum *e = (const struct iio_enum *)priv;
447 int i;
448
449 if (!e->get)
450 return -EINVAL;
451
452 i = e->get(indio_dev, chan);
453 if (i < 0)
454 return i;
455 else if (i >= e->num_items)
456 return -EINVAL;
457
458 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
459 }
460 EXPORT_SYMBOL_GPL(iio_enum_read);
461
462 ssize_t iio_enum_write(struct iio_dev *indio_dev,
463 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
464 size_t len)
465 {
466 const struct iio_enum *e = (const struct iio_enum *)priv;
467 int ret;
468
469 if (!e->set)
470 return -EINVAL;
471
472 ret = __sysfs_match_string(e->items, e->num_items, buf);
473 if (ret < 0)
474 return ret;
475
476 ret = e->set(indio_dev, chan, ret);
477 return ret ? ret : len;
478 }
479 EXPORT_SYMBOL_GPL(iio_enum_write);
480
481 static const struct iio_mount_matrix iio_mount_idmatrix = {
482 .rotation = {
483 "1", "0", "0",
484 "0", "1", "0",
485 "0", "0", "1"
486 }
487 };
488
489 static int iio_setup_mount_idmatrix(const struct device *dev,
490 struct iio_mount_matrix *matrix)
491 {
492 *matrix = iio_mount_idmatrix;
493 dev_info(dev, "mounting matrix not found: using identity...\n");
494 return 0;
495 }
496
497 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
498 const struct iio_chan_spec *chan, char *buf)
499 {
500 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
501 priv)(indio_dev, chan);
502
503 if (IS_ERR(mtx))
504 return PTR_ERR(mtx);
505
506 if (!mtx)
507 mtx = &iio_mount_idmatrix;
508
509 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
510 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
511 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
512 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
513 }
514 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
515
516 /**
517 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
518 * device "mount-matrix" property
519 * @dev: device the mounting matrix property is assigned to
520 * @propname: device specific mounting matrix property name
521 * @matrix: where to store retrieved matrix
522 *
523 * If device is assigned no mounting matrix property, a default 3x3 identity
524 * matrix will be filled in.
525 *
526 * Return: 0 if success, or a negative error code on failure.
527 */
528 int iio_read_mount_matrix(struct device *dev, const char *propname,
529 struct iio_mount_matrix *matrix)
530 {
531 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
532 int err;
533
534 err = device_property_read_string_array(dev, propname,
535 matrix->rotation, len);
536 if (err == len)
537 return 0;
538
539 if (err >= 0)
540 /* Invalid number of matrix entries. */
541 return -EINVAL;
542
543 if (err != -EINVAL)
544 /* Invalid matrix declaration format. */
545 return err;
546
547 /* Matrix was not declared at all: fallback to identity. */
548 return iio_setup_mount_idmatrix(dev, matrix);
549 }
550 EXPORT_SYMBOL(iio_read_mount_matrix);
551
552 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
553 int size, const int *vals)
554 {
555 unsigned long long tmp;
556 int tmp0, tmp1;
557 bool scale_db = false;
558
559 switch (type) {
560 case IIO_VAL_INT:
561 return snprintf(buf, len, "%d", vals[0]);
562 case IIO_VAL_INT_PLUS_MICRO_DB:
563 scale_db = true;
564 /* fall through */
565 case IIO_VAL_INT_PLUS_MICRO:
566 if (vals[1] < 0)
567 return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
568 -vals[1], scale_db ? " dB" : "");
569 else
570 return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
571 scale_db ? " dB" : "");
572 case IIO_VAL_INT_PLUS_NANO:
573 if (vals[1] < 0)
574 return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
575 -vals[1]);
576 else
577 return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
578 case IIO_VAL_FRACTIONAL:
579 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
580 tmp1 = vals[1];
581 tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
582 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
583 case IIO_VAL_FRACTIONAL_LOG2:
584 tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
585 tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
586 return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
587 case IIO_VAL_INT_MULTIPLE:
588 {
589 int i;
590 int l = 0;
591
592 for (i = 0; i < size; ++i) {
593 l += snprintf(&buf[l], len - l, "%d ", vals[i]);
594 if (l >= len)
595 break;
596 }
597 return l;
598 }
599 default:
600 return 0;
601 }
602 }
603
604 /**
605 * iio_format_value() - Formats a IIO value into its string representation
606 * @buf: The buffer to which the formatted value gets written
607 * which is assumed to be big enough (i.e. PAGE_SIZE).
608 * @type: One of the IIO_VAL_* constants. This decides how the val
609 * and val2 parameters are formatted.
610 * @size: Number of IIO value entries contained in vals
611 * @vals: Pointer to the values, exact meaning depends on the
612 * type parameter.
613 *
614 * Return: 0 by default, a negative number on failure or the
615 * total number of characters written for a type that belongs
616 * to the IIO_VAL_* constant.
617 */
618 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
619 {
620 ssize_t len;
621
622 len = __iio_format_value(buf, PAGE_SIZE, type, size, vals);
623 if (len >= PAGE_SIZE - 1)
624 return -EFBIG;
625
626 return len + sprintf(buf + len, "\n");
627 }
628 EXPORT_SYMBOL_GPL(iio_format_value);
629
630 static ssize_t iio_read_channel_info(struct device *dev,
631 struct device_attribute *attr,
632 char *buf)
633 {
634 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
635 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
636 int vals[INDIO_MAX_RAW_ELEMENTS];
637 int ret;
638 int val_len = 2;
639
640 if (indio_dev->info->read_raw_multi)
641 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
642 INDIO_MAX_RAW_ELEMENTS,
643 vals, &val_len,
644 this_attr->address);
645 else
646 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
647 &vals[0], &vals[1], this_attr->address);
648
649 if (ret < 0)
650 return ret;
651
652 return iio_format_value(buf, ret, val_len, vals);
653 }
654
655 static ssize_t iio_format_avail_list(char *buf, const int *vals,
656 int type, int length)
657 {
658 int i;
659 ssize_t len = 0;
660
661 switch (type) {
662 case IIO_VAL_INT:
663 for (i = 0; i < length; i++) {
664 len += __iio_format_value(buf + len, PAGE_SIZE - len,
665 type, 1, &vals[i]);
666 if (len >= PAGE_SIZE)
667 return -EFBIG;
668 if (i < length - 1)
669 len += snprintf(buf + len, PAGE_SIZE - len,
670 " ");
671 else
672 len += snprintf(buf + len, PAGE_SIZE - len,
673 "\n");
674 if (len >= PAGE_SIZE)
675 return -EFBIG;
676 }
677 break;
678 default:
679 for (i = 0; i < length / 2; i++) {
680 len += __iio_format_value(buf + len, PAGE_SIZE - len,
681 type, 2, &vals[i * 2]);
682 if (len >= PAGE_SIZE)
683 return -EFBIG;
684 if (i < length / 2 - 1)
685 len += snprintf(buf + len, PAGE_SIZE - len,
686 " ");
687 else
688 len += snprintf(buf + len, PAGE_SIZE - len,
689 "\n");
690 if (len >= PAGE_SIZE)
691 return -EFBIG;
692 }
693 }
694
695 return len;
696 }
697
698 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
699 {
700 int i;
701 ssize_t len;
702
703 len = snprintf(buf, PAGE_SIZE, "[");
704 switch (type) {
705 case IIO_VAL_INT:
706 for (i = 0; i < 3; i++) {
707 len += __iio_format_value(buf + len, PAGE_SIZE - len,
708 type, 1, &vals[i]);
709 if (len >= PAGE_SIZE)
710 return -EFBIG;
711 if (i < 2)
712 len += snprintf(buf + len, PAGE_SIZE - len,
713 " ");
714 else
715 len += snprintf(buf + len, PAGE_SIZE - len,
716 "]\n");
717 if (len >= PAGE_SIZE)
718 return -EFBIG;
719 }
720 break;
721 default:
722 for (i = 0; i < 3; i++) {
723 len += __iio_format_value(buf + len, PAGE_SIZE - len,
724 type, 2, &vals[i * 2]);
725 if (len >= PAGE_SIZE)
726 return -EFBIG;
727 if (i < 2)
728 len += snprintf(buf + len, PAGE_SIZE - len,
729 " ");
730 else
731 len += snprintf(buf + len, PAGE_SIZE - len,
732 "]\n");
733 if (len >= PAGE_SIZE)
734 return -EFBIG;
735 }
736 }
737
738 return len;
739 }
740
741 static ssize_t iio_read_channel_info_avail(struct device *dev,
742 struct device_attribute *attr,
743 char *buf)
744 {
745 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
746 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
747 const int *vals;
748 int ret;
749 int length;
750 int type;
751
752 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
753 &vals, &type, &length,
754 this_attr->address);
755
756 if (ret < 0)
757 return ret;
758 switch (ret) {
759 case IIO_AVAIL_LIST:
760 return iio_format_avail_list(buf, vals, type, length);
761 case IIO_AVAIL_RANGE:
762 return iio_format_avail_range(buf, vals, type);
763 default:
764 return -EINVAL;
765 }
766 }
767
768 /**
769 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
770 * @str: The string to parse
771 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
772 * @integer: The integer part of the number
773 * @fract: The fractional part of the number
774 *
775 * Returns 0 on success, or a negative error code if the string could not be
776 * parsed.
777 */
778 int iio_str_to_fixpoint(const char *str, int fract_mult,
779 int *integer, int *fract)
780 {
781 int i = 0, f = 0;
782 bool integer_part = true, negative = false;
783
784 if (fract_mult == 0) {
785 *fract = 0;
786
787 return kstrtoint(str, 0, integer);
788 }
789
790 if (str[0] == '-') {
791 negative = true;
792 str++;
793 } else if (str[0] == '+') {
794 str++;
795 }
796
797 while (*str) {
798 if ('0' <= *str && *str <= '9') {
799 if (integer_part) {
800 i = i * 10 + *str - '0';
801 } else {
802 f += fract_mult * (*str - '0');
803 fract_mult /= 10;
804 }
805 } else if (*str == '\n') {
806 if (*(str + 1) == '\0')
807 break;
808 else
809 return -EINVAL;
810 } else if (*str == '.' && integer_part) {
811 integer_part = false;
812 } else {
813 return -EINVAL;
814 }
815 str++;
816 }
817
818 if (negative) {
819 if (i)
820 i = -i;
821 else
822 f = -f;
823 }
824
825 *integer = i;
826 *fract = f;
827
828 return 0;
829 }
830 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
831
832 static ssize_t iio_write_channel_info(struct device *dev,
833 struct device_attribute *attr,
834 const char *buf,
835 size_t len)
836 {
837 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
838 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
839 int ret, fract_mult = 100000;
840 int integer, fract;
841
842 /* Assumes decimal - precision based on number of digits */
843 if (!indio_dev->info->write_raw)
844 return -EINVAL;
845
846 if (indio_dev->info->write_raw_get_fmt)
847 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
848 this_attr->c, this_attr->address)) {
849 case IIO_VAL_INT:
850 fract_mult = 0;
851 break;
852 case IIO_VAL_INT_PLUS_MICRO:
853 fract_mult = 100000;
854 break;
855 case IIO_VAL_INT_PLUS_NANO:
856 fract_mult = 100000000;
857 break;
858 default:
859 return -EINVAL;
860 }
861
862 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
863 if (ret)
864 return ret;
865
866 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
867 integer, fract, this_attr->address);
868 if (ret)
869 return ret;
870
871 return len;
872 }
873
874 static
875 int __iio_device_attr_init(struct device_attribute *dev_attr,
876 const char *postfix,
877 struct iio_chan_spec const *chan,
878 ssize_t (*readfunc)(struct device *dev,
879 struct device_attribute *attr,
880 char *buf),
881 ssize_t (*writefunc)(struct device *dev,
882 struct device_attribute *attr,
883 const char *buf,
884 size_t len),
885 enum iio_shared_by shared_by)
886 {
887 int ret = 0;
888 char *name = NULL;
889 char *full_postfix;
890 sysfs_attr_init(&dev_attr->attr);
891
892 /* Build up postfix of <extend_name>_<modifier>_postfix */
893 if (chan->modified && (shared_by == IIO_SEPARATE)) {
894 if (chan->extend_name)
895 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
896 iio_modifier_names[chan
897 ->channel2],
898 chan->extend_name,
899 postfix);
900 else
901 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
902 iio_modifier_names[chan
903 ->channel2],
904 postfix);
905 } else {
906 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
907 full_postfix = kstrdup(postfix, GFP_KERNEL);
908 else
909 full_postfix = kasprintf(GFP_KERNEL,
910 "%s_%s",
911 chan->extend_name,
912 postfix);
913 }
914 if (full_postfix == NULL)
915 return -ENOMEM;
916
917 if (chan->differential) { /* Differential can not have modifier */
918 switch (shared_by) {
919 case IIO_SHARED_BY_ALL:
920 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
921 break;
922 case IIO_SHARED_BY_DIR:
923 name = kasprintf(GFP_KERNEL, "%s_%s",
924 iio_direction[chan->output],
925 full_postfix);
926 break;
927 case IIO_SHARED_BY_TYPE:
928 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
929 iio_direction[chan->output],
930 iio_chan_type_name_spec[chan->type],
931 iio_chan_type_name_spec[chan->type],
932 full_postfix);
933 break;
934 case IIO_SEPARATE:
935 if (!chan->indexed) {
936 WARN(1, "Differential channels must be indexed\n");
937 ret = -EINVAL;
938 goto error_free_full_postfix;
939 }
940 name = kasprintf(GFP_KERNEL,
941 "%s_%s%d-%s%d_%s",
942 iio_direction[chan->output],
943 iio_chan_type_name_spec[chan->type],
944 chan->channel,
945 iio_chan_type_name_spec[chan->type],
946 chan->channel2,
947 full_postfix);
948 break;
949 }
950 } else { /* Single ended */
951 switch (shared_by) {
952 case IIO_SHARED_BY_ALL:
953 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
954 break;
955 case IIO_SHARED_BY_DIR:
956 name = kasprintf(GFP_KERNEL, "%s_%s",
957 iio_direction[chan->output],
958 full_postfix);
959 break;
960 case IIO_SHARED_BY_TYPE:
961 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
962 iio_direction[chan->output],
963 iio_chan_type_name_spec[chan->type],
964 full_postfix);
965 break;
966
967 case IIO_SEPARATE:
968 if (chan->indexed)
969 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
970 iio_direction[chan->output],
971 iio_chan_type_name_spec[chan->type],
972 chan->channel,
973 full_postfix);
974 else
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 }
982 if (name == NULL) {
983 ret = -ENOMEM;
984 goto error_free_full_postfix;
985 }
986 dev_attr->attr.name = name;
987
988 if (readfunc) {
989 dev_attr->attr.mode |= S_IRUGO;
990 dev_attr->show = readfunc;
991 }
992
993 if (writefunc) {
994 dev_attr->attr.mode |= S_IWUSR;
995 dev_attr->store = writefunc;
996 }
997
998 error_free_full_postfix:
999 kfree(full_postfix);
1000
1001 return ret;
1002 }
1003
1004 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1005 {
1006 kfree(dev_attr->attr.name);
1007 }
1008
1009 int __iio_add_chan_devattr(const char *postfix,
1010 struct iio_chan_spec const *chan,
1011 ssize_t (*readfunc)(struct device *dev,
1012 struct device_attribute *attr,
1013 char *buf),
1014 ssize_t (*writefunc)(struct device *dev,
1015 struct device_attribute *attr,
1016 const char *buf,
1017 size_t len),
1018 u64 mask,
1019 enum iio_shared_by shared_by,
1020 struct device *dev,
1021 struct list_head *attr_list)
1022 {
1023 int ret;
1024 struct iio_dev_attr *iio_attr, *t;
1025
1026 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1027 if (iio_attr == NULL)
1028 return -ENOMEM;
1029 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1030 postfix, chan,
1031 readfunc, writefunc, shared_by);
1032 if (ret)
1033 goto error_iio_dev_attr_free;
1034 iio_attr->c = chan;
1035 iio_attr->address = mask;
1036 list_for_each_entry(t, attr_list, l)
1037 if (strcmp(t->dev_attr.attr.name,
1038 iio_attr->dev_attr.attr.name) == 0) {
1039 if (shared_by == IIO_SEPARATE)
1040 dev_err(dev, "tried to double register : %s\n",
1041 t->dev_attr.attr.name);
1042 ret = -EBUSY;
1043 goto error_device_attr_deinit;
1044 }
1045 list_add(&iio_attr->l, attr_list);
1046
1047 return 0;
1048
1049 error_device_attr_deinit:
1050 __iio_device_attr_deinit(&iio_attr->dev_attr);
1051 error_iio_dev_attr_free:
1052 kfree(iio_attr);
1053 return ret;
1054 }
1055
1056 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1057 struct iio_chan_spec const *chan,
1058 enum iio_shared_by shared_by,
1059 const long *infomask)
1060 {
1061 int i, ret, attrcount = 0;
1062
1063 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1064 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1065 return -EINVAL;
1066 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1067 chan,
1068 &iio_read_channel_info,
1069 &iio_write_channel_info,
1070 i,
1071 shared_by,
1072 &indio_dev->dev,
1073 &indio_dev->channel_attr_list);
1074 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1075 continue;
1076 else if (ret < 0)
1077 return ret;
1078 attrcount++;
1079 }
1080
1081 return attrcount;
1082 }
1083
1084 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1085 struct iio_chan_spec const *chan,
1086 enum iio_shared_by shared_by,
1087 const long *infomask)
1088 {
1089 int i, ret, attrcount = 0;
1090 char *avail_postfix;
1091
1092 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1093 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1094 return -EINVAL;
1095 avail_postfix = kasprintf(GFP_KERNEL,
1096 "%s_available",
1097 iio_chan_info_postfix[i]);
1098 if (!avail_postfix)
1099 return -ENOMEM;
1100
1101 ret = __iio_add_chan_devattr(avail_postfix,
1102 chan,
1103 &iio_read_channel_info_avail,
1104 NULL,
1105 i,
1106 shared_by,
1107 &indio_dev->dev,
1108 &indio_dev->channel_attr_list);
1109 kfree(avail_postfix);
1110 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1111 continue;
1112 else if (ret < 0)
1113 return ret;
1114 attrcount++;
1115 }
1116
1117 return attrcount;
1118 }
1119
1120 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1121 struct iio_chan_spec const *chan)
1122 {
1123 int ret, attrcount = 0;
1124 const struct iio_chan_spec_ext_info *ext_info;
1125
1126 if (chan->channel < 0)
1127 return 0;
1128 ret = iio_device_add_info_mask_type(indio_dev, chan,
1129 IIO_SEPARATE,
1130 &chan->info_mask_separate);
1131 if (ret < 0)
1132 return ret;
1133 attrcount += ret;
1134
1135 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1136 IIO_SEPARATE,
1137 &chan->
1138 info_mask_separate_available);
1139 if (ret < 0)
1140 return ret;
1141 attrcount += ret;
1142
1143 ret = iio_device_add_info_mask_type(indio_dev, chan,
1144 IIO_SHARED_BY_TYPE,
1145 &chan->info_mask_shared_by_type);
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_SHARED_BY_TYPE,
1152 &chan->
1153 info_mask_shared_by_type_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_DIR,
1160 &chan->info_mask_shared_by_dir);
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_DIR,
1167 &chan->info_mask_shared_by_dir_available);
1168 if (ret < 0)
1169 return ret;
1170 attrcount += ret;
1171
1172 ret = iio_device_add_info_mask_type(indio_dev, chan,
1173 IIO_SHARED_BY_ALL,
1174 &chan->info_mask_shared_by_all);
1175 if (ret < 0)
1176 return ret;
1177 attrcount += ret;
1178
1179 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1180 IIO_SHARED_BY_ALL,
1181 &chan->info_mask_shared_by_all_available);
1182 if (ret < 0)
1183 return ret;
1184 attrcount += ret;
1185
1186 if (chan->ext_info) {
1187 unsigned int i = 0;
1188 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1189 ret = __iio_add_chan_devattr(ext_info->name,
1190 chan,
1191 ext_info->read ?
1192 &iio_read_channel_ext_info : NULL,
1193 ext_info->write ?
1194 &iio_write_channel_ext_info : NULL,
1195 i,
1196 ext_info->shared,
1197 &indio_dev->dev,
1198 &indio_dev->channel_attr_list);
1199 i++;
1200 if (ret == -EBUSY && ext_info->shared)
1201 continue;
1202
1203 if (ret)
1204 return ret;
1205
1206 attrcount++;
1207 }
1208 }
1209
1210 return attrcount;
1211 }
1212
1213 /**
1214 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1215 * @attr_list: List of IIO device attributes
1216 *
1217 * This function frees the memory allocated for each of the IIO device
1218 * attributes in the list.
1219 */
1220 void iio_free_chan_devattr_list(struct list_head *attr_list)
1221 {
1222 struct iio_dev_attr *p, *n;
1223
1224 list_for_each_entry_safe(p, n, attr_list, l) {
1225 kfree(p->dev_attr.attr.name);
1226 list_del(&p->l);
1227 kfree(p);
1228 }
1229 }
1230
1231 static ssize_t iio_show_dev_name(struct device *dev,
1232 struct device_attribute *attr,
1233 char *buf)
1234 {
1235 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1236 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
1237 }
1238
1239 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1240
1241 static ssize_t iio_show_timestamp_clock(struct device *dev,
1242 struct device_attribute *attr,
1243 char *buf)
1244 {
1245 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1246 const clockid_t clk = iio_device_get_clock(indio_dev);
1247 const char *name;
1248 ssize_t sz;
1249
1250 switch (clk) {
1251 case CLOCK_REALTIME:
1252 name = "realtime\n";
1253 sz = sizeof("realtime\n");
1254 break;
1255 case CLOCK_MONOTONIC:
1256 name = "monotonic\n";
1257 sz = sizeof("monotonic\n");
1258 break;
1259 case CLOCK_MONOTONIC_RAW:
1260 name = "monotonic_raw\n";
1261 sz = sizeof("monotonic_raw\n");
1262 break;
1263 case CLOCK_REALTIME_COARSE:
1264 name = "realtime_coarse\n";
1265 sz = sizeof("realtime_coarse\n");
1266 break;
1267 case CLOCK_MONOTONIC_COARSE:
1268 name = "monotonic_coarse\n";
1269 sz = sizeof("monotonic_coarse\n");
1270 break;
1271 case CLOCK_BOOTTIME:
1272 name = "boottime\n";
1273 sz = sizeof("boottime\n");
1274 break;
1275 case CLOCK_TAI:
1276 name = "tai\n";
1277 sz = sizeof("tai\n");
1278 break;
1279 default:
1280 BUG();
1281 }
1282
1283 memcpy(buf, name, sz);
1284 return sz;
1285 }
1286
1287 static ssize_t iio_store_timestamp_clock(struct device *dev,
1288 struct device_attribute *attr,
1289 const char *buf, size_t len)
1290 {
1291 clockid_t clk;
1292 int ret;
1293
1294 if (sysfs_streq(buf, "realtime"))
1295 clk = CLOCK_REALTIME;
1296 else if (sysfs_streq(buf, "monotonic"))
1297 clk = CLOCK_MONOTONIC;
1298 else if (sysfs_streq(buf, "monotonic_raw"))
1299 clk = CLOCK_MONOTONIC_RAW;
1300 else if (sysfs_streq(buf, "realtime_coarse"))
1301 clk = CLOCK_REALTIME_COARSE;
1302 else if (sysfs_streq(buf, "monotonic_coarse"))
1303 clk = CLOCK_MONOTONIC_COARSE;
1304 else if (sysfs_streq(buf, "boottime"))
1305 clk = CLOCK_BOOTTIME;
1306 else if (sysfs_streq(buf, "tai"))
1307 clk = CLOCK_TAI;
1308 else
1309 return -EINVAL;
1310
1311 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1312 if (ret)
1313 return ret;
1314
1315 return len;
1316 }
1317
1318 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1319 iio_show_timestamp_clock, iio_store_timestamp_clock);
1320
1321 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1322 {
1323 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1324 struct iio_dev_attr *p;
1325 struct attribute **attr, *clk = NULL;
1326
1327 /* First count elements in any existing group */
1328 if (indio_dev->info->attrs) {
1329 attr = indio_dev->info->attrs->attrs;
1330 while (*attr++ != NULL)
1331 attrcount_orig++;
1332 }
1333 attrcount = attrcount_orig;
1334 /*
1335 * New channel registration method - relies on the fact a group does
1336 * not need to be initialized if its name is NULL.
1337 */
1338 if (indio_dev->channels)
1339 for (i = 0; i < indio_dev->num_channels; i++) {
1340 const struct iio_chan_spec *chan =
1341 &indio_dev->channels[i];
1342
1343 if (chan->type == IIO_TIMESTAMP)
1344 clk = &dev_attr_current_timestamp_clock.attr;
1345
1346 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1347 if (ret < 0)
1348 goto error_clear_attrs;
1349 attrcount += ret;
1350 }
1351
1352 if (indio_dev->event_interface)
1353 clk = &dev_attr_current_timestamp_clock.attr;
1354
1355 if (indio_dev->name)
1356 attrcount++;
1357 if (clk)
1358 attrcount++;
1359
1360 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1361 sizeof(indio_dev->chan_attr_group.attrs[0]),
1362 GFP_KERNEL);
1363 if (indio_dev->chan_attr_group.attrs == NULL) {
1364 ret = -ENOMEM;
1365 goto error_clear_attrs;
1366 }
1367 /* Copy across original attributes */
1368 if (indio_dev->info->attrs)
1369 memcpy(indio_dev->chan_attr_group.attrs,
1370 indio_dev->info->attrs->attrs,
1371 sizeof(indio_dev->chan_attr_group.attrs[0])
1372 *attrcount_orig);
1373 attrn = attrcount_orig;
1374 /* Add all elements from the list. */
1375 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1376 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1377 if (indio_dev->name)
1378 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1379 if (clk)
1380 indio_dev->chan_attr_group.attrs[attrn++] = clk;
1381
1382 indio_dev->groups[indio_dev->groupcounter++] =
1383 &indio_dev->chan_attr_group;
1384
1385 return 0;
1386
1387 error_clear_attrs:
1388 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1389
1390 return ret;
1391 }
1392
1393 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1394 {
1395
1396 iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1397 kfree(indio_dev->chan_attr_group.attrs);
1398 indio_dev->chan_attr_group.attrs = NULL;
1399 }
1400
1401 static void iio_dev_release(struct device *device)
1402 {
1403 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1404 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1405 iio_device_unregister_trigger_consumer(indio_dev);
1406 iio_device_unregister_eventset(indio_dev);
1407 iio_device_unregister_sysfs(indio_dev);
1408
1409 iio_buffer_put(indio_dev->buffer);
1410
1411 ida_simple_remove(&iio_ida, indio_dev->id);
1412 kfree(indio_dev);
1413 }
1414
1415 struct device_type iio_device_type = {
1416 .name = "iio_device",
1417 .release = iio_dev_release,
1418 };
1419
1420 /**
1421 * iio_device_alloc() - allocate an iio_dev from a driver
1422 * @sizeof_priv: Space to allocate for private structure.
1423 **/
1424 struct iio_dev *iio_device_alloc(int sizeof_priv)
1425 {
1426 struct iio_dev *dev;
1427 size_t alloc_size;
1428
1429 alloc_size = sizeof(struct iio_dev);
1430 if (sizeof_priv) {
1431 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1432 alloc_size += sizeof_priv;
1433 }
1434 /* ensure 32-byte alignment of whole construct ? */
1435 alloc_size += IIO_ALIGN - 1;
1436
1437 dev = kzalloc(alloc_size, GFP_KERNEL);
1438
1439 if (dev) {
1440 dev->dev.groups = dev->groups;
1441 dev->dev.type = &iio_device_type;
1442 dev->dev.bus = &iio_bus_type;
1443 device_initialize(&dev->dev);
1444 dev_set_drvdata(&dev->dev, (void *)dev);
1445 mutex_init(&dev->mlock);
1446 mutex_init(&dev->info_exist_lock);
1447 INIT_LIST_HEAD(&dev->channel_attr_list);
1448
1449 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1450 if (dev->id < 0) {
1451 /* cannot use a dev_err as the name isn't available */
1452 pr_err("failed to get device id\n");
1453 kfree(dev);
1454 return NULL;
1455 }
1456 dev_set_name(&dev->dev, "iio:device%d", dev->id);
1457 INIT_LIST_HEAD(&dev->buffer_list);
1458 }
1459
1460 return dev;
1461 }
1462 EXPORT_SYMBOL(iio_device_alloc);
1463
1464 /**
1465 * iio_device_free() - free an iio_dev from a driver
1466 * @dev: the iio_dev associated with the device
1467 **/
1468 void iio_device_free(struct iio_dev *dev)
1469 {
1470 if (dev)
1471 put_device(&dev->dev);
1472 }
1473 EXPORT_SYMBOL(iio_device_free);
1474
1475 static void devm_iio_device_release(struct device *dev, void *res)
1476 {
1477 iio_device_free(*(struct iio_dev **)res);
1478 }
1479
1480 int devm_iio_device_match(struct device *dev, void *res, void *data)
1481 {
1482 struct iio_dev **r = res;
1483 if (!r || !*r) {
1484 WARN_ON(!r || !*r);
1485 return 0;
1486 }
1487 return *r == data;
1488 }
1489 EXPORT_SYMBOL_GPL(devm_iio_device_match);
1490
1491 /**
1492 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1493 * @dev: Device to allocate iio_dev for
1494 * @sizeof_priv: Space to allocate for private structure.
1495 *
1496 * Managed iio_device_alloc. iio_dev allocated with this function is
1497 * automatically freed on driver detach.
1498 *
1499 * If an iio_dev allocated with this function needs to be freed separately,
1500 * devm_iio_device_free() must be used.
1501 *
1502 * RETURNS:
1503 * Pointer to allocated iio_dev on success, NULL on failure.
1504 */
1505 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1506 {
1507 struct iio_dev **ptr, *iio_dev;
1508
1509 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1510 GFP_KERNEL);
1511 if (!ptr)
1512 return NULL;
1513
1514 iio_dev = iio_device_alloc(sizeof_priv);
1515 if (iio_dev) {
1516 *ptr = iio_dev;
1517 devres_add(dev, ptr);
1518 } else {
1519 devres_free(ptr);
1520 }
1521
1522 return iio_dev;
1523 }
1524 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1525
1526 /**
1527 * devm_iio_device_free - Resource-managed iio_device_free()
1528 * @dev: Device this iio_dev belongs to
1529 * @iio_dev: the iio_dev associated with the device
1530 *
1531 * Free iio_dev allocated with devm_iio_device_alloc().
1532 */
1533 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1534 {
1535 int rc;
1536
1537 rc = devres_release(dev, devm_iio_device_release,
1538 devm_iio_device_match, iio_dev);
1539 WARN_ON(rc);
1540 }
1541 EXPORT_SYMBOL_GPL(devm_iio_device_free);
1542
1543 /**
1544 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1545 * @inode: Inode structure for identifying the device in the file system
1546 * @filp: File structure for iio device used to keep and later access
1547 * private data
1548 *
1549 * Return: 0 on success or -EBUSY if the device is already opened
1550 **/
1551 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1552 {
1553 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1554 struct iio_dev, chrdev);
1555
1556 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1557 return -EBUSY;
1558
1559 iio_device_get(indio_dev);
1560
1561 filp->private_data = indio_dev;
1562
1563 return 0;
1564 }
1565
1566 /**
1567 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1568 * @inode: Inode structure pointer for the char device
1569 * @filp: File structure pointer for the char device
1570 *
1571 * Return: 0 for successful release
1572 */
1573 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1574 {
1575 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1576 struct iio_dev, chrdev);
1577 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1578 iio_device_put(indio_dev);
1579
1580 return 0;
1581 }
1582
1583 /* Somewhat of a cross file organization violation - ioctls here are actually
1584 * event related */
1585 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1586 {
1587 struct iio_dev *indio_dev = filp->private_data;
1588 int __user *ip = (int __user *)arg;
1589 int fd;
1590
1591 if (!indio_dev->info)
1592 return -ENODEV;
1593
1594 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
1595 fd = iio_event_getfd(indio_dev);
1596 if (fd < 0)
1597 return fd;
1598 if (copy_to_user(ip, &fd, sizeof(fd)))
1599 return -EFAULT;
1600 return 0;
1601 }
1602 return -EINVAL;
1603 }
1604
1605 static const struct file_operations iio_buffer_fileops = {
1606 .read = iio_buffer_read_first_n_outer_addr,
1607 .release = iio_chrdev_release,
1608 .open = iio_chrdev_open,
1609 .poll = iio_buffer_poll_addr,
1610 .owner = THIS_MODULE,
1611 .llseek = noop_llseek,
1612 .unlocked_ioctl = iio_ioctl,
1613 .compat_ioctl = iio_ioctl,
1614 };
1615
1616 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1617 {
1618 int i, j;
1619 const struct iio_chan_spec *channels = indio_dev->channels;
1620
1621 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1622 return 0;
1623
1624 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1625 if (channels[i].scan_index < 0)
1626 continue;
1627 for (j = i + 1; j < indio_dev->num_channels; j++)
1628 if (channels[i].scan_index == channels[j].scan_index) {
1629 dev_err(&indio_dev->dev,
1630 "Duplicate scan index %d\n",
1631 channels[i].scan_index);
1632 return -EINVAL;
1633 }
1634 }
1635
1636 return 0;
1637 }
1638
1639 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1640
1641 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1642 {
1643 int ret;
1644
1645 indio_dev->driver_module = this_mod;
1646 /* If the calling driver did not initialize of_node, do it here */
1647 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1648 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1649
1650 ret = iio_check_unique_scan_index(indio_dev);
1651 if (ret < 0)
1652 return ret;
1653
1654 if (!indio_dev->info)
1655 return -EINVAL;
1656
1657 /* configure elements for the chrdev */
1658 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1659
1660 iio_device_register_debugfs(indio_dev);
1661
1662 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
1663 if (ret) {
1664 dev_err(indio_dev->dev.parent,
1665 "Failed to create buffer sysfs interfaces\n");
1666 goto error_unreg_debugfs;
1667 }
1668
1669 ret = iio_device_register_sysfs(indio_dev);
1670 if (ret) {
1671 dev_err(indio_dev->dev.parent,
1672 "Failed to register sysfs interfaces\n");
1673 goto error_buffer_free_sysfs;
1674 }
1675 ret = iio_device_register_eventset(indio_dev);
1676 if (ret) {
1677 dev_err(indio_dev->dev.parent,
1678 "Failed to register event set\n");
1679 goto error_free_sysfs;
1680 }
1681 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1682 iio_device_register_trigger_consumer(indio_dev);
1683
1684 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1685 indio_dev->setup_ops == NULL)
1686 indio_dev->setup_ops = &noop_ring_setup_ops;
1687
1688 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1689
1690 indio_dev->chrdev.owner = this_mod;
1691
1692 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1693 if (ret < 0)
1694 goto error_unreg_eventset;
1695
1696 return 0;
1697
1698 error_unreg_eventset:
1699 iio_device_unregister_eventset(indio_dev);
1700 error_free_sysfs:
1701 iio_device_unregister_sysfs(indio_dev);
1702 error_buffer_free_sysfs:
1703 iio_buffer_free_sysfs_and_mask(indio_dev);
1704 error_unreg_debugfs:
1705 iio_device_unregister_debugfs(indio_dev);
1706 return ret;
1707 }
1708 EXPORT_SYMBOL(__iio_device_register);
1709
1710 /**
1711 * iio_device_unregister() - unregister a device from the IIO subsystem
1712 * @indio_dev: Device structure representing the device.
1713 **/
1714 void iio_device_unregister(struct iio_dev *indio_dev)
1715 {
1716 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1717
1718 mutex_lock(&indio_dev->info_exist_lock);
1719
1720 iio_device_unregister_debugfs(indio_dev);
1721
1722 iio_disable_all_buffers(indio_dev);
1723
1724 indio_dev->info = NULL;
1725
1726 iio_device_wakeup_eventset(indio_dev);
1727 iio_buffer_wakeup_poll(indio_dev);
1728
1729 mutex_unlock(&indio_dev->info_exist_lock);
1730
1731 iio_buffer_free_sysfs_and_mask(indio_dev);
1732 }
1733 EXPORT_SYMBOL(iio_device_unregister);
1734
1735 static void devm_iio_device_unreg(struct device *dev, void *res)
1736 {
1737 iio_device_unregister(*(struct iio_dev **)res);
1738 }
1739
1740 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1741 struct module *this_mod)
1742 {
1743 struct iio_dev **ptr;
1744 int ret;
1745
1746 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1747 if (!ptr)
1748 return -ENOMEM;
1749
1750 *ptr = indio_dev;
1751 ret = __iio_device_register(indio_dev, this_mod);
1752 if (!ret)
1753 devres_add(dev, ptr);
1754 else
1755 devres_free(ptr);
1756
1757 return ret;
1758 }
1759 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1760
1761 /**
1762 * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1763 * @dev: Device this iio_dev belongs to
1764 * @indio_dev: the iio_dev associated with the device
1765 *
1766 * Unregister iio_dev registered with devm_iio_device_register().
1767 */
1768 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1769 {
1770 int rc;
1771
1772 rc = devres_release(dev, devm_iio_device_unreg,
1773 devm_iio_device_match, indio_dev);
1774 WARN_ON(rc);
1775 }
1776 EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
1777
1778 /**
1779 * iio_device_claim_direct_mode - Keep device in direct mode
1780 * @indio_dev: the iio_dev associated with the device
1781 *
1782 * If the device is in direct mode it is guaranteed to stay
1783 * that way until iio_device_release_direct_mode() is called.
1784 *
1785 * Use with iio_device_release_direct_mode()
1786 *
1787 * Returns: 0 on success, -EBUSY on failure
1788 */
1789 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1790 {
1791 mutex_lock(&indio_dev->mlock);
1792
1793 if (iio_buffer_enabled(indio_dev)) {
1794 mutex_unlock(&indio_dev->mlock);
1795 return -EBUSY;
1796 }
1797 return 0;
1798 }
1799 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1800
1801 /**
1802 * iio_device_release_direct_mode - releases claim on direct mode
1803 * @indio_dev: the iio_dev associated with the device
1804 *
1805 * Release the claim. Device is no longer guaranteed to stay
1806 * in direct mode.
1807 *
1808 * Use with iio_device_claim_direct_mode()
1809 */
1810 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
1811 {
1812 mutex_unlock(&indio_dev->mlock);
1813 }
1814 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
1815
1816 subsys_initcall(iio_init);
1817 module_exit(iio_exit);
1818
1819 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1820 MODULE_DESCRIPTION("Industrial I/O core");
1821 MODULE_LICENSE("GPL");
Linux with added FPC-III support