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 <linux/iio/iio-opaque.h>
29 #include "iio_core.h"
30 #include "iio_core_trigger.h"
31 #include <linux/iio/sysfs.h>
32 #include <linux/iio/events.h>
33 #include <linux/iio/buffer.h>
34 #include <linux/iio/buffer_impl.h>
35
36 /* IDA to assign each registered device a unique id */
37 static DEFINE_IDA(iio_ida);
38
39 static dev_t iio_devt;
40
41 #define IIO_DEV_MAX 256
42 struct bus_type iio_bus_type = {
43 .name = "iio",
44 };
45 EXPORT_SYMBOL(iio_bus_type);
46
47 static struct dentry *iio_debugfs_dentry;
48
49 static const char * const iio_direction[] = {
50 [0] = "in",
51 [1] = "out",
52 };
53
54 static const char * const iio_chan_type_name_spec[] = {
55 [IIO_VOLTAGE] = "voltage",
56 [IIO_CURRENT] = "current",
57 [IIO_POWER] = "power",
58 [IIO_ACCEL] = "accel",
59 [IIO_ANGL_VEL] = "anglvel",
60 [IIO_MAGN] = "magn",
61 [IIO_LIGHT] = "illuminance",
62 [IIO_INTENSITY] = "intensity",
63 [IIO_PROXIMITY] = "proximity",
64 [IIO_TEMP] = "temp",
65 [IIO_INCLI] = "incli",
66 [IIO_ROT] = "rot",
67 [IIO_ANGL] = "angl",
68 [IIO_TIMESTAMP] = "timestamp",
69 [IIO_CAPACITANCE] = "capacitance",
70 [IIO_ALTVOLTAGE] = "altvoltage",
71 [IIO_CCT] = "cct",
72 [IIO_PRESSURE] = "pressure",
73 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
74 [IIO_ACTIVITY] = "activity",
75 [IIO_STEPS] = "steps",
76 [IIO_ENERGY] = "energy",
77 [IIO_DISTANCE] = "distance",
78 [IIO_VELOCITY] = "velocity",
79 [IIO_CONCENTRATION] = "concentration",
80 [IIO_RESISTANCE] = "resistance",
81 [IIO_PH] = "ph",
82 [IIO_UVINDEX] = "uvindex",
83 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
84 [IIO_COUNT] = "count",
85 [IIO_INDEX] = "index",
86 [IIO_GRAVITY] = "gravity",
87 [IIO_POSITIONRELATIVE] = "positionrelative",
88 [IIO_PHASE] = "phase",
89 [IIO_MASSCONCENTRATION] = "massconcentration",
90 };
91
92 static const char * const iio_modifier_names[] = {
93 [IIO_MOD_X] = "x",
94 [IIO_MOD_Y] = "y",
95 [IIO_MOD_Z] = "z",
96 [IIO_MOD_X_AND_Y] = "x&y",
97 [IIO_MOD_X_AND_Z] = "x&z",
98 [IIO_MOD_Y_AND_Z] = "y&z",
99 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
100 [IIO_MOD_X_OR_Y] = "x|y",
101 [IIO_MOD_X_OR_Z] = "x|z",
102 [IIO_MOD_Y_OR_Z] = "y|z",
103 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
106 [IIO_MOD_LIGHT_BOTH] = "both",
107 [IIO_MOD_LIGHT_IR] = "ir",
108 [IIO_MOD_LIGHT_CLEAR] = "clear",
109 [IIO_MOD_LIGHT_RED] = "red",
110 [IIO_MOD_LIGHT_GREEN] = "green",
111 [IIO_MOD_LIGHT_BLUE] = "blue",
112 [IIO_MOD_LIGHT_UV] = "uv",
113 [IIO_MOD_LIGHT_DUV] = "duv",
114 [IIO_MOD_QUATERNION] = "quaternion",
115 [IIO_MOD_TEMP_AMBIENT] = "ambient",
116 [IIO_MOD_TEMP_OBJECT] = "object",
117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
121 [IIO_MOD_RUNNING] = "running",
122 [IIO_MOD_JOGGING] = "jogging",
123 [IIO_MOD_WALKING] = "walking",
124 [IIO_MOD_STILL] = "still",
125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
126 [IIO_MOD_I] = "i",
127 [IIO_MOD_Q] = "q",
128 [IIO_MOD_CO2] = "co2",
129 [IIO_MOD_VOC] = "voc",
130 [IIO_MOD_PM1] = "pm1",
131 [IIO_MOD_PM2P5] = "pm2p5",
132 [IIO_MOD_PM4] = "pm4",
133 [IIO_MOD_PM10] = "pm10",
134 [IIO_MOD_ETHANOL] = "ethanol",
135 [IIO_MOD_H2] = "h2",
136 [IIO_MOD_O2] = "o2",
137 };
138
139 /* relies on pairs of these shared then separate */
140 static const char * const iio_chan_info_postfix[] = {
141 [IIO_CHAN_INFO_RAW] = "raw",
142 [IIO_CHAN_INFO_PROCESSED] = "input",
143 [IIO_CHAN_INFO_SCALE] = "scale",
144 [IIO_CHAN_INFO_OFFSET] = "offset",
145 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
146 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
147 [IIO_CHAN_INFO_PEAK] = "peak_raw",
148 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
149 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
150 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
151 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
152 = "filter_low_pass_3db_frequency",
153 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
154 = "filter_high_pass_3db_frequency",
155 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
156 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
157 [IIO_CHAN_INFO_PHASE] = "phase",
158 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
159 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
160 [IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative",
161 [IIO_CHAN_INFO_INT_TIME] = "integration_time",
162 [IIO_CHAN_INFO_ENABLE] = "en",
163 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
164 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
165 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
166 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
167 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
168 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
169 [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
170 [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient",
171 };
172
173 /**
174 * iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
175 * @array: array of strings
176 * @n: number of strings in the array
177 * @str: string to match with
178 *
179 * Returns index of @str in the @array or -EINVAL, similar to match_string().
180 * Uses sysfs_streq instead of strcmp for matching.
181 *
182 * This routine will look for a string in an array of strings.
183 * The search will continue until the element is found or the n-th element
184 * is reached, regardless of any NULL elements in the array.
185 */
iio_sysfs_match_string_with_gaps(const char * const * array,size_t n,const char * str)186 static int iio_sysfs_match_string_with_gaps(const char * const *array, size_t n,
187 const char *str)
188 {
189 const char *item;
190 int index;
191
192 for (index = 0; index < n; index++) {
193 item = array[index];
194 if (!item)
195 continue;
196 if (sysfs_streq(item, str))
197 return index;
198 }
199
200 return -EINVAL;
201 }
202
203 #if defined(CONFIG_DEBUG_FS)
204 /*
205 * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
206 * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
207 */
iio_get_debugfs_dentry(struct iio_dev * indio_dev)208 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
209 {
210 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
211 return iio_dev_opaque->debugfs_dentry;
212 }
213 EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
214 #endif
215
216 /**
217 * iio_find_channel_from_si() - get channel from its scan index
218 * @indio_dev: device
219 * @si: scan index to match
220 */
221 const struct iio_chan_spec
iio_find_channel_from_si(struct iio_dev * indio_dev,int si)222 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
223 {
224 int i;
225
226 for (i = 0; i < indio_dev->num_channels; i++)
227 if (indio_dev->channels[i].scan_index == si)
228 return &indio_dev->channels[i];
229 return NULL;
230 }
231
232 /* This turns up an awful lot */
iio_read_const_attr(struct device * dev,struct device_attribute * attr,char * buf)233 ssize_t iio_read_const_attr(struct device *dev,
234 struct device_attribute *attr,
235 char *buf)
236 {
237 return sysfs_emit(buf, "%s\n", to_iio_const_attr(attr)->string);
238 }
239 EXPORT_SYMBOL(iio_read_const_attr);
240
241 /**
242 * iio_device_set_clock() - Set current timestamping clock for the device
243 * @indio_dev: IIO device structure containing the device
244 * @clock_id: timestamping clock posix identifier to set.
245 */
iio_device_set_clock(struct iio_dev * indio_dev,clockid_t clock_id)246 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
247 {
248 int ret;
249 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
250 const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
251
252 ret = mutex_lock_interruptible(&indio_dev->mlock);
253 if (ret)
254 return ret;
255 if ((ev_int && iio_event_enabled(ev_int)) ||
256 iio_buffer_enabled(indio_dev)) {
257 mutex_unlock(&indio_dev->mlock);
258 return -EBUSY;
259 }
260 indio_dev->clock_id = clock_id;
261 mutex_unlock(&indio_dev->mlock);
262
263 return 0;
264 }
265 EXPORT_SYMBOL(iio_device_set_clock);
266
267 /**
268 * iio_get_time_ns() - utility function to get a time stamp for events etc
269 * @indio_dev: device
270 */
iio_get_time_ns(const struct iio_dev * indio_dev)271 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
272 {
273 struct timespec64 tp;
274
275 switch (iio_device_get_clock(indio_dev)) {
276 case CLOCK_REALTIME:
277 return ktime_get_real_ns();
278 case CLOCK_MONOTONIC:
279 return ktime_get_ns();
280 case CLOCK_MONOTONIC_RAW:
281 return ktime_get_raw_ns();
282 case CLOCK_REALTIME_COARSE:
283 return ktime_to_ns(ktime_get_coarse_real());
284 case CLOCK_MONOTONIC_COARSE:
285 ktime_get_coarse_ts64(&tp);
286 return timespec64_to_ns(&tp);
287 case CLOCK_BOOTTIME:
288 return ktime_get_boottime_ns();
289 case CLOCK_TAI:
290 return ktime_get_clocktai_ns();
291 default:
292 BUG();
293 }
294 }
295 EXPORT_SYMBOL(iio_get_time_ns);
296
297 /**
298 * iio_get_time_res() - utility function to get time stamp clock resolution in
299 * nano seconds.
300 * @indio_dev: device
301 */
iio_get_time_res(const struct iio_dev * indio_dev)302 unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
303 {
304 switch (iio_device_get_clock(indio_dev)) {
305 case CLOCK_REALTIME:
306 case CLOCK_MONOTONIC:
307 case CLOCK_MONOTONIC_RAW:
308 case CLOCK_BOOTTIME:
309 case CLOCK_TAI:
310 return hrtimer_resolution;
311 case CLOCK_REALTIME_COARSE:
312 case CLOCK_MONOTONIC_COARSE:
313 return LOW_RES_NSEC;
314 default:
315 BUG();
316 }
317 }
318 EXPORT_SYMBOL(iio_get_time_res);
319
iio_init(void)320 static int __init iio_init(void)
321 {
322 int ret;
323
324 /* Register sysfs bus */
325 ret = bus_register(&iio_bus_type);
326 if (ret < 0) {
327 pr_err("could not register bus type\n");
328 goto error_nothing;
329 }
330
331 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
332 if (ret < 0) {
333 pr_err("failed to allocate char dev region\n");
334 goto error_unregister_bus_type;
335 }
336
337 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
338
339 return 0;
340
341 error_unregister_bus_type:
342 bus_unregister(&iio_bus_type);
343 error_nothing:
344 return ret;
345 }
346
iio_exit(void)347 static void __exit iio_exit(void)
348 {
349 if (iio_devt)
350 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
351 bus_unregister(&iio_bus_type);
352 debugfs_remove(iio_debugfs_dentry);
353 }
354
355 #if defined(CONFIG_DEBUG_FS)
iio_debugfs_read_reg(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)356 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
357 size_t count, loff_t *ppos)
358 {
359 struct iio_dev *indio_dev = file->private_data;
360 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
361 unsigned val = 0;
362 int ret;
363
364 if (*ppos > 0)
365 return simple_read_from_buffer(userbuf, count, ppos,
366 iio_dev_opaque->read_buf,
367 iio_dev_opaque->read_buf_len);
368
369 ret = indio_dev->info->debugfs_reg_access(indio_dev,
370 iio_dev_opaque->cached_reg_addr,
371 0, &val);
372 if (ret) {
373 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
374 return ret;
375 }
376
377 iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
378 sizeof(iio_dev_opaque->read_buf),
379 "0x%X\n", val);
380
381 return simple_read_from_buffer(userbuf, count, ppos,
382 iio_dev_opaque->read_buf,
383 iio_dev_opaque->read_buf_len);
384 }
385
iio_debugfs_write_reg(struct file * file,const char __user * userbuf,size_t count,loff_t * ppos)386 static ssize_t iio_debugfs_write_reg(struct file *file,
387 const char __user *userbuf, size_t count, loff_t *ppos)
388 {
389 struct iio_dev *indio_dev = file->private_data;
390 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
391 unsigned reg, val;
392 char buf[80];
393 int ret;
394
395 count = min_t(size_t, count, (sizeof(buf)-1));
396 if (copy_from_user(buf, userbuf, count))
397 return -EFAULT;
398
399 buf[count] = 0;
400
401 ret = sscanf(buf, "%i %i", ®, &val);
402
403 switch (ret) {
404 case 1:
405 iio_dev_opaque->cached_reg_addr = reg;
406 break;
407 case 2:
408 iio_dev_opaque->cached_reg_addr = reg;
409 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
410 val, NULL);
411 if (ret) {
412 dev_err(indio_dev->dev.parent, "%s: write failed\n",
413 __func__);
414 return ret;
415 }
416 break;
417 default:
418 return -EINVAL;
419 }
420
421 return count;
422 }
423
424 static const struct file_operations iio_debugfs_reg_fops = {
425 .open = simple_open,
426 .read = iio_debugfs_read_reg,
427 .write = iio_debugfs_write_reg,
428 };
429
iio_device_unregister_debugfs(struct iio_dev * indio_dev)430 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
431 {
432 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
433 debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
434 }
435
iio_device_register_debugfs(struct iio_dev * indio_dev)436 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
437 {
438 struct iio_dev_opaque *iio_dev_opaque;
439
440 if (indio_dev->info->debugfs_reg_access == NULL)
441 return;
442
443 if (!iio_debugfs_dentry)
444 return;
445
446 iio_dev_opaque = to_iio_dev_opaque(indio_dev);
447
448 iio_dev_opaque->debugfs_dentry =
449 debugfs_create_dir(dev_name(&indio_dev->dev),
450 iio_debugfs_dentry);
451
452 debugfs_create_file("direct_reg_access", 0644,
453 iio_dev_opaque->debugfs_dentry, indio_dev,
454 &iio_debugfs_reg_fops);
455 }
456 #else
iio_device_register_debugfs(struct iio_dev * indio_dev)457 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
458 {
459 }
460
iio_device_unregister_debugfs(struct iio_dev * indio_dev)461 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
462 {
463 }
464 #endif /* CONFIG_DEBUG_FS */
465
iio_read_channel_ext_info(struct device * dev,struct device_attribute * attr,char * buf)466 static ssize_t iio_read_channel_ext_info(struct device *dev,
467 struct device_attribute *attr,
468 char *buf)
469 {
470 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
471 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
472 const struct iio_chan_spec_ext_info *ext_info;
473
474 ext_info = &this_attr->c->ext_info[this_attr->address];
475
476 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
477 }
478
iio_write_channel_ext_info(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)479 static ssize_t iio_write_channel_ext_info(struct device *dev,
480 struct device_attribute *attr,
481 const char *buf,
482 size_t len)
483 {
484 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
485 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
486 const struct iio_chan_spec_ext_info *ext_info;
487
488 ext_info = &this_attr->c->ext_info[this_attr->address];
489
490 return ext_info->write(indio_dev, ext_info->private,
491 this_attr->c, buf, len);
492 }
493
iio_enum_available_read(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,char * buf)494 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
495 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
496 {
497 const struct iio_enum *e = (const struct iio_enum *)priv;
498 unsigned int i;
499 size_t len = 0;
500
501 if (!e->num_items)
502 return 0;
503
504 for (i = 0; i < e->num_items; ++i) {
505 if (!e->items[i])
506 continue;
507 len += sysfs_emit_at(buf, len, "%s ", e->items[i]);
508 }
509
510 /* replace last space with a newline */
511 buf[len - 1] = '\n';
512
513 return len;
514 }
515 EXPORT_SYMBOL_GPL(iio_enum_available_read);
516
iio_enum_read(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,char * buf)517 ssize_t iio_enum_read(struct iio_dev *indio_dev,
518 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
519 {
520 const struct iio_enum *e = (const struct iio_enum *)priv;
521 int i;
522
523 if (!e->get)
524 return -EINVAL;
525
526 i = e->get(indio_dev, chan);
527 if (i < 0)
528 return i;
529 else if (i >= e->num_items || !e->items[i])
530 return -EINVAL;
531
532 return sysfs_emit(buf, "%s\n", e->items[i]);
533 }
534 EXPORT_SYMBOL_GPL(iio_enum_read);
535
iio_enum_write(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,const char * buf,size_t len)536 ssize_t iio_enum_write(struct iio_dev *indio_dev,
537 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
538 size_t len)
539 {
540 const struct iio_enum *e = (const struct iio_enum *)priv;
541 int ret;
542
543 if (!e->set)
544 return -EINVAL;
545
546 ret = iio_sysfs_match_string_with_gaps(e->items, e->num_items, buf);
547 if (ret < 0)
548 return ret;
549
550 ret = e->set(indio_dev, chan, ret);
551 return ret ? ret : len;
552 }
553 EXPORT_SYMBOL_GPL(iio_enum_write);
554
555 static const struct iio_mount_matrix iio_mount_idmatrix = {
556 .rotation = {
557 "1", "0", "0",
558 "0", "1", "0",
559 "0", "0", "1"
560 }
561 };
562
iio_setup_mount_idmatrix(const struct device * dev,struct iio_mount_matrix * matrix)563 static int iio_setup_mount_idmatrix(const struct device *dev,
564 struct iio_mount_matrix *matrix)
565 {
566 *matrix = iio_mount_idmatrix;
567 dev_info(dev, "mounting matrix not found: using identity...\n");
568 return 0;
569 }
570
iio_show_mount_matrix(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,char * buf)571 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
572 const struct iio_chan_spec *chan, char *buf)
573 {
574 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
575 priv)(indio_dev, chan);
576
577 if (IS_ERR(mtx))
578 return PTR_ERR(mtx);
579
580 if (!mtx)
581 mtx = &iio_mount_idmatrix;
582
583 return sysfs_emit(buf, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
584 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
585 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
586 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
587 }
588 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
589
590 /**
591 * iio_read_mount_matrix() - retrieve iio device mounting matrix from
592 * device "mount-matrix" property
593 * @dev: device the mounting matrix property is assigned to
594 * @propname: device specific mounting matrix property name
595 * @matrix: where to store retrieved matrix
596 *
597 * If device is assigned no mounting matrix property, a default 3x3 identity
598 * matrix will be filled in.
599 *
600 * Return: 0 if success, or a negative error code on failure.
601 */
iio_read_mount_matrix(struct device * dev,const char * propname,struct iio_mount_matrix * matrix)602 int iio_read_mount_matrix(struct device *dev, const char *propname,
603 struct iio_mount_matrix *matrix)
604 {
605 size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
606 int err;
607
608 err = device_property_read_string_array(dev, propname,
609 matrix->rotation, len);
610 if (err == len)
611 return 0;
612
613 if (err >= 0)
614 /* Invalid number of matrix entries. */
615 return -EINVAL;
616
617 if (err != -EINVAL)
618 /* Invalid matrix declaration format. */
619 return err;
620
621 /* Matrix was not declared at all: fallback to identity. */
622 return iio_setup_mount_idmatrix(dev, matrix);
623 }
624 EXPORT_SYMBOL(iio_read_mount_matrix);
625
__iio_format_value(char * buf,size_t offset,unsigned int type,int size,const int * vals)626 static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type,
627 int size, const int *vals)
628 {
629 int tmp0, tmp1;
630 s64 tmp2;
631 bool scale_db = false;
632
633 switch (type) {
634 case IIO_VAL_INT:
635 return sysfs_emit_at(buf, offset, "%d", vals[0]);
636 case IIO_VAL_INT_PLUS_MICRO_DB:
637 scale_db = true;
638 fallthrough;
639 case IIO_VAL_INT_PLUS_MICRO:
640 if (vals[1] < 0)
641 return sysfs_emit_at(buf, offset, "-%d.%06u%s",
642 abs(vals[0]), -vals[1],
643 scale_db ? " dB" : "");
644 else
645 return sysfs_emit_at(buf, offset, "%d.%06u%s", vals[0],
646 vals[1], scale_db ? " dB" : "");
647 case IIO_VAL_INT_PLUS_NANO:
648 if (vals[1] < 0)
649 return sysfs_emit_at(buf, offset, "-%d.%09u",
650 abs(vals[0]), -vals[1]);
651 else
652 return sysfs_emit_at(buf, offset, "%d.%09u", vals[0],
653 vals[1]);
654 case IIO_VAL_FRACTIONAL:
655 tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
656 tmp1 = vals[1];
657 tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1);
658 if ((tmp2 < 0) && (tmp0 == 0))
659 return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
660 else
661 return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
662 abs(tmp1));
663 case IIO_VAL_FRACTIONAL_LOG2:
664 tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
665 tmp0 = (int)div_s64_rem(tmp2, 1000000000LL, &tmp1);
666 if (tmp0 == 0 && tmp2 < 0)
667 return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
668 else
669 return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
670 abs(tmp1));
671 case IIO_VAL_INT_MULTIPLE:
672 {
673 int i;
674 int l = 0;
675
676 for (i = 0; i < size; ++i)
677 l += sysfs_emit_at(buf, offset + l, "%d ", vals[i]);
678 return l;
679 }
680 case IIO_VAL_CHAR:
681 return sysfs_emit_at(buf, offset, "%c", (char)vals[0]);
682 default:
683 return 0;
684 }
685 }
686
687 /**
688 * iio_format_value() - Formats a IIO value into its string representation
689 * @buf: The buffer to which the formatted value gets written
690 * which is assumed to be big enough (i.e. PAGE_SIZE).
691 * @type: One of the IIO_VAL_* constants. This decides how the val
692 * and val2 parameters are formatted.
693 * @size: Number of IIO value entries contained in vals
694 * @vals: Pointer to the values, exact meaning depends on the
695 * type parameter.
696 *
697 * Return: 0 by default, a negative number on failure or the
698 * total number of characters written for a type that belongs
699 * to the IIO_VAL_* constant.
700 */
iio_format_value(char * buf,unsigned int type,int size,int * vals)701 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
702 {
703 ssize_t len;
704
705 len = __iio_format_value(buf, 0, type, size, vals);
706 if (len >= PAGE_SIZE - 1)
707 return -EFBIG;
708
709 return len + sysfs_emit_at(buf, len, "\n");
710 }
711 EXPORT_SYMBOL_GPL(iio_format_value);
712
iio_read_channel_label(struct device * dev,struct device_attribute * attr,char * buf)713 static ssize_t iio_read_channel_label(struct device *dev,
714 struct device_attribute *attr,
715 char *buf)
716 {
717 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
718 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
719
720 if (!indio_dev->info->read_label)
721 return -EINVAL;
722
723 return indio_dev->info->read_label(indio_dev, this_attr->c, buf);
724 }
725
iio_read_channel_info(struct device * dev,struct device_attribute * attr,char * buf)726 static ssize_t iio_read_channel_info(struct device *dev,
727 struct device_attribute *attr,
728 char *buf)
729 {
730 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
731 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
732 int vals[INDIO_MAX_RAW_ELEMENTS];
733 int ret;
734 int val_len = 2;
735
736 if (indio_dev->info->read_raw_multi)
737 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
738 INDIO_MAX_RAW_ELEMENTS,
739 vals, &val_len,
740 this_attr->address);
741 else
742 ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
743 &vals[0], &vals[1], this_attr->address);
744
745 if (ret < 0)
746 return ret;
747
748 return iio_format_value(buf, ret, val_len, vals);
749 }
750
iio_format_list(char * buf,const int * vals,int type,int length,const char * prefix,const char * suffix)751 static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
752 const char *prefix, const char *suffix)
753 {
754 ssize_t len;
755 int stride;
756 int i;
757
758 switch (type) {
759 case IIO_VAL_INT:
760 stride = 1;
761 break;
762 default:
763 stride = 2;
764 break;
765 }
766
767 len = sysfs_emit(buf, prefix);
768
769 for (i = 0; i <= length - stride; i += stride) {
770 if (i != 0) {
771 len += sysfs_emit_at(buf, len, " ");
772 if (len >= PAGE_SIZE)
773 return -EFBIG;
774 }
775
776 len += __iio_format_value(buf, len, type, stride, &vals[i]);
777 if (len >= PAGE_SIZE)
778 return -EFBIG;
779 }
780
781 len += sysfs_emit_at(buf, len, "%s\n", suffix);
782
783 return len;
784 }
785
iio_format_avail_list(char * buf,const int * vals,int type,int length)786 static ssize_t iio_format_avail_list(char *buf, const int *vals,
787 int type, int length)
788 {
789
790 return iio_format_list(buf, vals, type, length, "", "");
791 }
792
iio_format_avail_range(char * buf,const int * vals,int type)793 static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
794 {
795 return iio_format_list(buf, vals, type, 3, "[", "]");
796 }
797
iio_read_channel_info_avail(struct device * dev,struct device_attribute * attr,char * buf)798 static ssize_t iio_read_channel_info_avail(struct device *dev,
799 struct device_attribute *attr,
800 char *buf)
801 {
802 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
803 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
804 const int *vals;
805 int ret;
806 int length;
807 int type;
808
809 ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
810 &vals, &type, &length,
811 this_attr->address);
812
813 if (ret < 0)
814 return ret;
815 switch (ret) {
816 case IIO_AVAIL_LIST:
817 return iio_format_avail_list(buf, vals, type, length);
818 case IIO_AVAIL_RANGE:
819 return iio_format_avail_range(buf, vals, type);
820 default:
821 return -EINVAL;
822 }
823 }
824
825 /**
826 * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
827 * @str: The string to parse
828 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
829 * @integer: The integer part of the number
830 * @fract: The fractional part of the number
831 * @scale_db: True if this should parse as dB
832 *
833 * Returns 0 on success, or a negative error code if the string could not be
834 * parsed.
835 */
__iio_str_to_fixpoint(const char * str,int fract_mult,int * integer,int * fract,bool scale_db)836 static int __iio_str_to_fixpoint(const char *str, int fract_mult,
837 int *integer, int *fract, bool scale_db)
838 {
839 int i = 0, f = 0;
840 bool integer_part = true, negative = false;
841
842 if (fract_mult == 0) {
843 *fract = 0;
844
845 return kstrtoint(str, 0, integer);
846 }
847
848 if (str[0] == '-') {
849 negative = true;
850 str++;
851 } else if (str[0] == '+') {
852 str++;
853 }
854
855 while (*str) {
856 if ('0' <= *str && *str <= '9') {
857 if (integer_part) {
858 i = i * 10 + *str - '0';
859 } else {
860 f += fract_mult * (*str - '0');
861 fract_mult /= 10;
862 }
863 } else if (*str == '\n') {
864 if (*(str + 1) == '\0')
865 break;
866 else
867 return -EINVAL;
868 } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
869 /* Ignore the dB suffix */
870 str += sizeof(" dB") - 1;
871 continue;
872 } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
873 /* Ignore the dB suffix */
874 str += sizeof("dB") - 1;
875 continue;
876 } else if (*str == '.' && integer_part) {
877 integer_part = false;
878 } else {
879 return -EINVAL;
880 }
881 str++;
882 }
883
884 if (negative) {
885 if (i)
886 i = -i;
887 else
888 f = -f;
889 }
890
891 *integer = i;
892 *fract = f;
893
894 return 0;
895 }
896
897 /**
898 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
899 * @str: The string to parse
900 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
901 * @integer: The integer part of the number
902 * @fract: The fractional part of the number
903 *
904 * Returns 0 on success, or a negative error code if the string could not be
905 * parsed.
906 */
iio_str_to_fixpoint(const char * str,int fract_mult,int * integer,int * fract)907 int iio_str_to_fixpoint(const char *str, int fract_mult,
908 int *integer, int *fract)
909 {
910 return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
911 }
912 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
913
iio_write_channel_info(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)914 static ssize_t iio_write_channel_info(struct device *dev,
915 struct device_attribute *attr,
916 const char *buf,
917 size_t len)
918 {
919 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
920 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
921 int ret, fract_mult = 100000;
922 int integer, fract = 0;
923 bool is_char = false;
924 bool scale_db = false;
925
926 /* Assumes decimal - precision based on number of digits */
927 if (!indio_dev->info->write_raw)
928 return -EINVAL;
929
930 if (indio_dev->info->write_raw_get_fmt)
931 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
932 this_attr->c, this_attr->address)) {
933 case IIO_VAL_INT:
934 fract_mult = 0;
935 break;
936 case IIO_VAL_INT_PLUS_MICRO_DB:
937 scale_db = true;
938 fallthrough;
939 case IIO_VAL_INT_PLUS_MICRO:
940 fract_mult = 100000;
941 break;
942 case IIO_VAL_INT_PLUS_NANO:
943 fract_mult = 100000000;
944 break;
945 case IIO_VAL_CHAR:
946 is_char = true;
947 break;
948 default:
949 return -EINVAL;
950 }
951
952 if (is_char) {
953 char ch;
954
955 if (sscanf(buf, "%c", &ch) != 1)
956 return -EINVAL;
957 integer = ch;
958 } else {
959 ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
960 scale_db);
961 if (ret)
962 return ret;
963 }
964
965 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
966 integer, fract, this_attr->address);
967 if (ret)
968 return ret;
969
970 return len;
971 }
972
973 static
__iio_device_attr_init(struct device_attribute * dev_attr,const char * postfix,struct iio_chan_spec const * chan,ssize_t (* readfunc)(struct device * dev,struct device_attribute * attr,char * buf),ssize_t (* writefunc)(struct device * dev,struct device_attribute * attr,const char * buf,size_t len),enum iio_shared_by shared_by)974 int __iio_device_attr_init(struct device_attribute *dev_attr,
975 const char *postfix,
976 struct iio_chan_spec const *chan,
977 ssize_t (*readfunc)(struct device *dev,
978 struct device_attribute *attr,
979 char *buf),
980 ssize_t (*writefunc)(struct device *dev,
981 struct device_attribute *attr,
982 const char *buf,
983 size_t len),
984 enum iio_shared_by shared_by)
985 {
986 int ret = 0;
987 char *name = NULL;
988 char *full_postfix;
989 sysfs_attr_init(&dev_attr->attr);
990
991 /* Build up postfix of <extend_name>_<modifier>_postfix */
992 if (chan->modified && (shared_by == IIO_SEPARATE)) {
993 if (chan->extend_name)
994 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
995 iio_modifier_names[chan
996 ->channel2],
997 chan->extend_name,
998 postfix);
999 else
1000 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
1001 iio_modifier_names[chan
1002 ->channel2],
1003 postfix);
1004 } else {
1005 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
1006 full_postfix = kstrdup(postfix, GFP_KERNEL);
1007 else
1008 full_postfix = kasprintf(GFP_KERNEL,
1009 "%s_%s",
1010 chan->extend_name,
1011 postfix);
1012 }
1013 if (full_postfix == NULL)
1014 return -ENOMEM;
1015
1016 if (chan->differential) { /* Differential can not have modifier */
1017 switch (shared_by) {
1018 case IIO_SHARED_BY_ALL:
1019 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1020 break;
1021 case IIO_SHARED_BY_DIR:
1022 name = kasprintf(GFP_KERNEL, "%s_%s",
1023 iio_direction[chan->output],
1024 full_postfix);
1025 break;
1026 case IIO_SHARED_BY_TYPE:
1027 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
1028 iio_direction[chan->output],
1029 iio_chan_type_name_spec[chan->type],
1030 iio_chan_type_name_spec[chan->type],
1031 full_postfix);
1032 break;
1033 case IIO_SEPARATE:
1034 if (!chan->indexed) {
1035 WARN(1, "Differential channels must be indexed\n");
1036 ret = -EINVAL;
1037 goto error_free_full_postfix;
1038 }
1039 name = kasprintf(GFP_KERNEL,
1040 "%s_%s%d-%s%d_%s",
1041 iio_direction[chan->output],
1042 iio_chan_type_name_spec[chan->type],
1043 chan->channel,
1044 iio_chan_type_name_spec[chan->type],
1045 chan->channel2,
1046 full_postfix);
1047 break;
1048 }
1049 } else { /* Single ended */
1050 switch (shared_by) {
1051 case IIO_SHARED_BY_ALL:
1052 name = kasprintf(GFP_KERNEL, "%s", full_postfix);
1053 break;
1054 case IIO_SHARED_BY_DIR:
1055 name = kasprintf(GFP_KERNEL, "%s_%s",
1056 iio_direction[chan->output],
1057 full_postfix);
1058 break;
1059 case IIO_SHARED_BY_TYPE:
1060 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1061 iio_direction[chan->output],
1062 iio_chan_type_name_spec[chan->type],
1063 full_postfix);
1064 break;
1065
1066 case IIO_SEPARATE:
1067 if (chan->indexed)
1068 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
1069 iio_direction[chan->output],
1070 iio_chan_type_name_spec[chan->type],
1071 chan->channel,
1072 full_postfix);
1073 else
1074 name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1075 iio_direction[chan->output],
1076 iio_chan_type_name_spec[chan->type],
1077 full_postfix);
1078 break;
1079 }
1080 }
1081 if (name == NULL) {
1082 ret = -ENOMEM;
1083 goto error_free_full_postfix;
1084 }
1085 dev_attr->attr.name = name;
1086
1087 if (readfunc) {
1088 dev_attr->attr.mode |= S_IRUGO;
1089 dev_attr->show = readfunc;
1090 }
1091
1092 if (writefunc) {
1093 dev_attr->attr.mode |= S_IWUSR;
1094 dev_attr->store = writefunc;
1095 }
1096
1097 error_free_full_postfix:
1098 kfree(full_postfix);
1099
1100 return ret;
1101 }
1102
__iio_device_attr_deinit(struct device_attribute * dev_attr)1103 static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1104 {
1105 kfree(dev_attr->attr.name);
1106 }
1107
__iio_add_chan_devattr(const char * postfix,struct iio_chan_spec const * chan,ssize_t (* readfunc)(struct device * dev,struct device_attribute * attr,char * buf),ssize_t (* writefunc)(struct device * dev,struct device_attribute * attr,const char * buf,size_t len),u64 mask,enum iio_shared_by shared_by,struct device * dev,struct iio_buffer * buffer,struct list_head * attr_list)1108 int __iio_add_chan_devattr(const char *postfix,
1109 struct iio_chan_spec const *chan,
1110 ssize_t (*readfunc)(struct device *dev,
1111 struct device_attribute *attr,
1112 char *buf),
1113 ssize_t (*writefunc)(struct device *dev,
1114 struct device_attribute *attr,
1115 const char *buf,
1116 size_t len),
1117 u64 mask,
1118 enum iio_shared_by shared_by,
1119 struct device *dev,
1120 struct iio_buffer *buffer,
1121 struct list_head *attr_list)
1122 {
1123 int ret;
1124 struct iio_dev_attr *iio_attr, *t;
1125
1126 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1127 if (iio_attr == NULL)
1128 return -ENOMEM;
1129 ret = __iio_device_attr_init(&iio_attr->dev_attr,
1130 postfix, chan,
1131 readfunc, writefunc, shared_by);
1132 if (ret)
1133 goto error_iio_dev_attr_free;
1134 iio_attr->c = chan;
1135 iio_attr->address = mask;
1136 iio_attr->buffer = buffer;
1137 list_for_each_entry(t, attr_list, l)
1138 if (strcmp(t->dev_attr.attr.name,
1139 iio_attr->dev_attr.attr.name) == 0) {
1140 if (shared_by == IIO_SEPARATE)
1141 dev_err(dev, "tried to double register : %s\n",
1142 t->dev_attr.attr.name);
1143 ret = -EBUSY;
1144 goto error_device_attr_deinit;
1145 }
1146 list_add(&iio_attr->l, attr_list);
1147
1148 return 0;
1149
1150 error_device_attr_deinit:
1151 __iio_device_attr_deinit(&iio_attr->dev_attr);
1152 error_iio_dev_attr_free:
1153 kfree(iio_attr);
1154 return ret;
1155 }
1156
iio_device_add_channel_label(struct iio_dev * indio_dev,struct iio_chan_spec const * chan)1157 static int iio_device_add_channel_label(struct iio_dev *indio_dev,
1158 struct iio_chan_spec const *chan)
1159 {
1160 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1161 int ret;
1162
1163 if (!indio_dev->info->read_label)
1164 return 0;
1165
1166 ret = __iio_add_chan_devattr("label",
1167 chan,
1168 &iio_read_channel_label,
1169 NULL,
1170 0,
1171 IIO_SEPARATE,
1172 &indio_dev->dev,
1173 NULL,
1174 &iio_dev_opaque->channel_attr_list);
1175 if (ret < 0)
1176 return ret;
1177
1178 return 1;
1179 }
1180
iio_device_add_info_mask_type(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,enum iio_shared_by shared_by,const long * infomask)1181 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
1182 struct iio_chan_spec const *chan,
1183 enum iio_shared_by shared_by,
1184 const long *infomask)
1185 {
1186 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1187 int i, ret, attrcount = 0;
1188
1189 for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1190 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1191 return -EINVAL;
1192 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
1193 chan,
1194 &iio_read_channel_info,
1195 &iio_write_channel_info,
1196 i,
1197 shared_by,
1198 &indio_dev->dev,
1199 NULL,
1200 &iio_dev_opaque->channel_attr_list);
1201 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1202 continue;
1203 else if (ret < 0)
1204 return ret;
1205 attrcount++;
1206 }
1207
1208 return attrcount;
1209 }
1210
iio_device_add_info_mask_type_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,enum iio_shared_by shared_by,const long * infomask)1211 static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
1212 struct iio_chan_spec const *chan,
1213 enum iio_shared_by shared_by,
1214 const long *infomask)
1215 {
1216 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1217 int i, ret, attrcount = 0;
1218 char *avail_postfix;
1219
1220 for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1221 if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1222 return -EINVAL;
1223 avail_postfix = kasprintf(GFP_KERNEL,
1224 "%s_available",
1225 iio_chan_info_postfix[i]);
1226 if (!avail_postfix)
1227 return -ENOMEM;
1228
1229 ret = __iio_add_chan_devattr(avail_postfix,
1230 chan,
1231 &iio_read_channel_info_avail,
1232 NULL,
1233 i,
1234 shared_by,
1235 &indio_dev->dev,
1236 NULL,
1237 &iio_dev_opaque->channel_attr_list);
1238 kfree(avail_postfix);
1239 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1240 continue;
1241 else if (ret < 0)
1242 return ret;
1243 attrcount++;
1244 }
1245
1246 return attrcount;
1247 }
1248
iio_device_add_channel_sysfs(struct iio_dev * indio_dev,struct iio_chan_spec const * chan)1249 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
1250 struct iio_chan_spec const *chan)
1251 {
1252 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1253 int ret, attrcount = 0;
1254 const struct iio_chan_spec_ext_info *ext_info;
1255
1256 if (chan->channel < 0)
1257 return 0;
1258 ret = iio_device_add_info_mask_type(indio_dev, chan,
1259 IIO_SEPARATE,
1260 &chan->info_mask_separate);
1261 if (ret < 0)
1262 return ret;
1263 attrcount += ret;
1264
1265 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1266 IIO_SEPARATE,
1267 &chan->
1268 info_mask_separate_available);
1269 if (ret < 0)
1270 return ret;
1271 attrcount += ret;
1272
1273 ret = iio_device_add_info_mask_type(indio_dev, chan,
1274 IIO_SHARED_BY_TYPE,
1275 &chan->info_mask_shared_by_type);
1276 if (ret < 0)
1277 return ret;
1278 attrcount += ret;
1279
1280 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1281 IIO_SHARED_BY_TYPE,
1282 &chan->
1283 info_mask_shared_by_type_available);
1284 if (ret < 0)
1285 return ret;
1286 attrcount += ret;
1287
1288 ret = iio_device_add_info_mask_type(indio_dev, chan,
1289 IIO_SHARED_BY_DIR,
1290 &chan->info_mask_shared_by_dir);
1291 if (ret < 0)
1292 return ret;
1293 attrcount += ret;
1294
1295 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1296 IIO_SHARED_BY_DIR,
1297 &chan->info_mask_shared_by_dir_available);
1298 if (ret < 0)
1299 return ret;
1300 attrcount += ret;
1301
1302 ret = iio_device_add_info_mask_type(indio_dev, chan,
1303 IIO_SHARED_BY_ALL,
1304 &chan->info_mask_shared_by_all);
1305 if (ret < 0)
1306 return ret;
1307 attrcount += ret;
1308
1309 ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
1310 IIO_SHARED_BY_ALL,
1311 &chan->info_mask_shared_by_all_available);
1312 if (ret < 0)
1313 return ret;
1314 attrcount += ret;
1315
1316 ret = iio_device_add_channel_label(indio_dev, chan);
1317 if (ret < 0)
1318 return ret;
1319 attrcount += ret;
1320
1321 if (chan->ext_info) {
1322 unsigned int i = 0;
1323 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
1324 ret = __iio_add_chan_devattr(ext_info->name,
1325 chan,
1326 ext_info->read ?
1327 &iio_read_channel_ext_info : NULL,
1328 ext_info->write ?
1329 &iio_write_channel_ext_info : NULL,
1330 i,
1331 ext_info->shared,
1332 &indio_dev->dev,
1333 NULL,
1334 &iio_dev_opaque->channel_attr_list);
1335 i++;
1336 if (ret == -EBUSY && ext_info->shared)
1337 continue;
1338
1339 if (ret)
1340 return ret;
1341
1342 attrcount++;
1343 }
1344 }
1345
1346 return attrcount;
1347 }
1348
1349 /**
1350 * iio_free_chan_devattr_list() - Free a list of IIO device attributes
1351 * @attr_list: List of IIO device attributes
1352 *
1353 * This function frees the memory allocated for each of the IIO device
1354 * attributes in the list.
1355 */
iio_free_chan_devattr_list(struct list_head * attr_list)1356 void iio_free_chan_devattr_list(struct list_head *attr_list)
1357 {
1358 struct iio_dev_attr *p, *n;
1359
1360 list_for_each_entry_safe(p, n, attr_list, l) {
1361 kfree_const(p->dev_attr.attr.name);
1362 list_del(&p->l);
1363 kfree(p);
1364 }
1365 }
1366
iio_show_dev_name(struct device * dev,struct device_attribute * attr,char * buf)1367 static ssize_t iio_show_dev_name(struct device *dev,
1368 struct device_attribute *attr,
1369 char *buf)
1370 {
1371 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1372 return sysfs_emit(buf, "%s\n", indio_dev->name);
1373 }
1374
1375 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1376
iio_show_dev_label(struct device * dev,struct device_attribute * attr,char * buf)1377 static ssize_t iio_show_dev_label(struct device *dev,
1378 struct device_attribute *attr,
1379 char *buf)
1380 {
1381 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1382 return sysfs_emit(buf, "%s\n", indio_dev->label);
1383 }
1384
1385 static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
1386
iio_show_timestamp_clock(struct device * dev,struct device_attribute * attr,char * buf)1387 static ssize_t iio_show_timestamp_clock(struct device *dev,
1388 struct device_attribute *attr,
1389 char *buf)
1390 {
1391 const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1392 const clockid_t clk = iio_device_get_clock(indio_dev);
1393 const char *name;
1394 ssize_t sz;
1395
1396 switch (clk) {
1397 case CLOCK_REALTIME:
1398 name = "realtime\n";
1399 sz = sizeof("realtime\n");
1400 break;
1401 case CLOCK_MONOTONIC:
1402 name = "monotonic\n";
1403 sz = sizeof("monotonic\n");
1404 break;
1405 case CLOCK_MONOTONIC_RAW:
1406 name = "monotonic_raw\n";
1407 sz = sizeof("monotonic_raw\n");
1408 break;
1409 case CLOCK_REALTIME_COARSE:
1410 name = "realtime_coarse\n";
1411 sz = sizeof("realtime_coarse\n");
1412 break;
1413 case CLOCK_MONOTONIC_COARSE:
1414 name = "monotonic_coarse\n";
1415 sz = sizeof("monotonic_coarse\n");
1416 break;
1417 case CLOCK_BOOTTIME:
1418 name = "boottime\n";
1419 sz = sizeof("boottime\n");
1420 break;
1421 case CLOCK_TAI:
1422 name = "tai\n";
1423 sz = sizeof("tai\n");
1424 break;
1425 default:
1426 BUG();
1427 }
1428
1429 memcpy(buf, name, sz);
1430 return sz;
1431 }
1432
iio_store_timestamp_clock(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)1433 static ssize_t iio_store_timestamp_clock(struct device *dev,
1434 struct device_attribute *attr,
1435 const char *buf, size_t len)
1436 {
1437 clockid_t clk;
1438 int ret;
1439
1440 if (sysfs_streq(buf, "realtime"))
1441 clk = CLOCK_REALTIME;
1442 else if (sysfs_streq(buf, "monotonic"))
1443 clk = CLOCK_MONOTONIC;
1444 else if (sysfs_streq(buf, "monotonic_raw"))
1445 clk = CLOCK_MONOTONIC_RAW;
1446 else if (sysfs_streq(buf, "realtime_coarse"))
1447 clk = CLOCK_REALTIME_COARSE;
1448 else if (sysfs_streq(buf, "monotonic_coarse"))
1449 clk = CLOCK_MONOTONIC_COARSE;
1450 else if (sysfs_streq(buf, "boottime"))
1451 clk = CLOCK_BOOTTIME;
1452 else if (sysfs_streq(buf, "tai"))
1453 clk = CLOCK_TAI;
1454 else
1455 return -EINVAL;
1456
1457 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
1458 if (ret)
1459 return ret;
1460
1461 return len;
1462 }
1463
iio_device_register_sysfs_group(struct iio_dev * indio_dev,const struct attribute_group * group)1464 int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
1465 const struct attribute_group *group)
1466 {
1467 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1468 const struct attribute_group **new, **old = iio_dev_opaque->groups;
1469 unsigned int cnt = iio_dev_opaque->groupcounter;
1470
1471 new = krealloc(old, sizeof(*new) * (cnt + 2), GFP_KERNEL);
1472 if (!new)
1473 return -ENOMEM;
1474
1475 new[iio_dev_opaque->groupcounter++] = group;
1476 new[iio_dev_opaque->groupcounter] = NULL;
1477
1478 iio_dev_opaque->groups = new;
1479
1480 return 0;
1481 }
1482
1483 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
1484 iio_show_timestamp_clock, iio_store_timestamp_clock);
1485
iio_device_register_sysfs(struct iio_dev * indio_dev)1486 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
1487 {
1488 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1489 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
1490 struct iio_dev_attr *p;
1491 struct attribute **attr, *clk = NULL;
1492
1493 /* First count elements in any existing group */
1494 if (indio_dev->info->attrs) {
1495 attr = indio_dev->info->attrs->attrs;
1496 while (*attr++ != NULL)
1497 attrcount_orig++;
1498 }
1499 attrcount = attrcount_orig;
1500 /*
1501 * New channel registration method - relies on the fact a group does
1502 * not need to be initialized if its name is NULL.
1503 */
1504 if (indio_dev->channels)
1505 for (i = 0; i < indio_dev->num_channels; i++) {
1506 const struct iio_chan_spec *chan =
1507 &indio_dev->channels[i];
1508
1509 if (chan->type == IIO_TIMESTAMP)
1510 clk = &dev_attr_current_timestamp_clock.attr;
1511
1512 ret = iio_device_add_channel_sysfs(indio_dev, chan);
1513 if (ret < 0)
1514 goto error_clear_attrs;
1515 attrcount += ret;
1516 }
1517
1518 if (iio_dev_opaque->event_interface)
1519 clk = &dev_attr_current_timestamp_clock.attr;
1520
1521 if (indio_dev->name)
1522 attrcount++;
1523 if (indio_dev->label)
1524 attrcount++;
1525 if (clk)
1526 attrcount++;
1527
1528 iio_dev_opaque->chan_attr_group.attrs =
1529 kcalloc(attrcount + 1,
1530 sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1531 GFP_KERNEL);
1532 if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
1533 ret = -ENOMEM;
1534 goto error_clear_attrs;
1535 }
1536 /* Copy across original attributes */
1537 if (indio_dev->info->attrs) {
1538 memcpy(iio_dev_opaque->chan_attr_group.attrs,
1539 indio_dev->info->attrs->attrs,
1540 sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
1541 *attrcount_orig);
1542 iio_dev_opaque->chan_attr_group.is_visible =
1543 indio_dev->info->attrs->is_visible;
1544 }
1545 attrn = attrcount_orig;
1546 /* Add all elements from the list. */
1547 list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
1548 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1549 if (indio_dev->name)
1550 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1551 if (indio_dev->label)
1552 iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
1553 if (clk)
1554 iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
1555
1556 ret = iio_device_register_sysfs_group(indio_dev,
1557 &iio_dev_opaque->chan_attr_group);
1558 if (ret)
1559 goto error_clear_attrs;
1560
1561 return 0;
1562
1563 error_clear_attrs:
1564 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1565
1566 return ret;
1567 }
1568
iio_device_unregister_sysfs(struct iio_dev * indio_dev)1569 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
1570 {
1571 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1572
1573 iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1574 kfree(iio_dev_opaque->chan_attr_group.attrs);
1575 iio_dev_opaque->chan_attr_group.attrs = NULL;
1576 kfree(iio_dev_opaque->groups);
1577 }
1578
iio_dev_release(struct device * device)1579 static void iio_dev_release(struct device *device)
1580 {
1581 struct iio_dev *indio_dev = dev_to_iio_dev(device);
1582 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1583
1584 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1585 iio_device_unregister_trigger_consumer(indio_dev);
1586 iio_device_unregister_eventset(indio_dev);
1587 iio_device_unregister_sysfs(indio_dev);
1588
1589 iio_device_detach_buffers(indio_dev);
1590
1591 ida_simple_remove(&iio_ida, indio_dev->id);
1592 kfree(iio_dev_opaque);
1593 }
1594
1595 struct device_type iio_device_type = {
1596 .name = "iio_device",
1597 .release = iio_dev_release,
1598 };
1599
1600 /**
1601 * iio_device_alloc() - allocate an iio_dev from a driver
1602 * @parent: Parent device.
1603 * @sizeof_priv: Space to allocate for private structure.
1604 **/
iio_device_alloc(struct device * parent,int sizeof_priv)1605 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
1606 {
1607 struct iio_dev_opaque *iio_dev_opaque;
1608 struct iio_dev *indio_dev;
1609 size_t alloc_size;
1610
1611 alloc_size = sizeof(struct iio_dev_opaque);
1612 if (sizeof_priv) {
1613 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
1614 alloc_size += sizeof_priv;
1615 }
1616
1617 iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1618 if (!iio_dev_opaque)
1619 return NULL;
1620
1621 indio_dev = &iio_dev_opaque->indio_dev;
1622 indio_dev->priv = (char *)iio_dev_opaque +
1623 ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
1624
1625 indio_dev->dev.parent = parent;
1626 indio_dev->dev.type = &iio_device_type;
1627 indio_dev->dev.bus = &iio_bus_type;
1628 device_initialize(&indio_dev->dev);
1629 iio_device_set_drvdata(indio_dev, (void *)indio_dev);
1630 mutex_init(&indio_dev->mlock);
1631 mutex_init(&indio_dev->info_exist_lock);
1632 INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
1633
1634 indio_dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1635 if (indio_dev->id < 0) {
1636 /* cannot use a dev_err as the name isn't available */
1637 pr_err("failed to get device id\n");
1638 kfree(iio_dev_opaque);
1639 return NULL;
1640 }
1641 dev_set_name(&indio_dev->dev, "iio:device%d", indio_dev->id);
1642 INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
1643 INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
1644
1645 return indio_dev;
1646 }
1647 EXPORT_SYMBOL(iio_device_alloc);
1648
1649 /**
1650 * iio_device_free() - free an iio_dev from a driver
1651 * @dev: the iio_dev associated with the device
1652 **/
iio_device_free(struct iio_dev * dev)1653 void iio_device_free(struct iio_dev *dev)
1654 {
1655 if (dev)
1656 put_device(&dev->dev);
1657 }
1658 EXPORT_SYMBOL(iio_device_free);
1659
devm_iio_device_release(struct device * dev,void * res)1660 static void devm_iio_device_release(struct device *dev, void *res)
1661 {
1662 iio_device_free(*(struct iio_dev **)res);
1663 }
1664
1665 /**
1666 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1667 * @parent: Device to allocate iio_dev for, and parent for this IIO device
1668 * @sizeof_priv: Space to allocate for private structure.
1669 *
1670 * Managed iio_device_alloc. iio_dev allocated with this function is
1671 * automatically freed on driver detach.
1672 *
1673 * RETURNS:
1674 * Pointer to allocated iio_dev on success, NULL on failure.
1675 */
devm_iio_device_alloc(struct device * parent,int sizeof_priv)1676 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
1677 {
1678 struct iio_dev **ptr, *iio_dev;
1679
1680 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
1681 GFP_KERNEL);
1682 if (!ptr)
1683 return NULL;
1684
1685 iio_dev = iio_device_alloc(parent, sizeof_priv);
1686 if (iio_dev) {
1687 *ptr = iio_dev;
1688 devres_add(parent, ptr);
1689 } else {
1690 devres_free(ptr);
1691 }
1692
1693 return iio_dev;
1694 }
1695 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1696
1697 /**
1698 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
1699 * @inode: Inode structure for identifying the device in the file system
1700 * @filp: File structure for iio device used to keep and later access
1701 * private data
1702 *
1703 * Return: 0 on success or -EBUSY if the device is already opened
1704 **/
iio_chrdev_open(struct inode * inode,struct file * filp)1705 static int iio_chrdev_open(struct inode *inode, struct file *filp)
1706 {
1707 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1708 struct iio_dev, chrdev);
1709 struct iio_dev_buffer_pair *ib;
1710
1711 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
1712 return -EBUSY;
1713
1714 iio_device_get(indio_dev);
1715
1716 ib = kmalloc(sizeof(*ib), GFP_KERNEL);
1717 if (!ib) {
1718 iio_device_put(indio_dev);
1719 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1720 return -ENOMEM;
1721 }
1722
1723 ib->indio_dev = indio_dev;
1724 ib->buffer = indio_dev->buffer;
1725
1726 filp->private_data = ib;
1727
1728 return 0;
1729 }
1730
1731 /**
1732 * iio_chrdev_release() - chrdev file close buffer access and ioctls
1733 * @inode: Inode structure pointer for the char device
1734 * @filp: File structure pointer for the char device
1735 *
1736 * Return: 0 for successful release
1737 */
iio_chrdev_release(struct inode * inode,struct file * filp)1738 static int iio_chrdev_release(struct inode *inode, struct file *filp)
1739 {
1740 struct iio_dev_buffer_pair *ib = filp->private_data;
1741 struct iio_dev *indio_dev = container_of(inode->i_cdev,
1742 struct iio_dev, chrdev);
1743 kfree(ib);
1744 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
1745 iio_device_put(indio_dev);
1746
1747 return 0;
1748 }
1749
iio_device_ioctl_handler_register(struct iio_dev * indio_dev,struct iio_ioctl_handler * h)1750 void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
1751 struct iio_ioctl_handler *h)
1752 {
1753 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1754
1755 list_add_tail(&h->entry, &iio_dev_opaque->ioctl_handlers);
1756 }
1757
iio_device_ioctl_handler_unregister(struct iio_ioctl_handler * h)1758 void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h)
1759 {
1760 list_del(&h->entry);
1761 }
1762
iio_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1763 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1764 {
1765 struct iio_dev_buffer_pair *ib = filp->private_data;
1766 struct iio_dev *indio_dev = ib->indio_dev;
1767 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1768 struct iio_ioctl_handler *h;
1769 int ret = -ENODEV;
1770
1771 mutex_lock(&indio_dev->info_exist_lock);
1772
1773 /**
1774 * The NULL check here is required to prevent crashing when a device
1775 * is being removed while userspace would still have open file handles
1776 * to try to access this device.
1777 */
1778 if (!indio_dev->info)
1779 goto out_unlock;
1780
1781 list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
1782 ret = h->ioctl(indio_dev, filp, cmd, arg);
1783 if (ret != IIO_IOCTL_UNHANDLED)
1784 break;
1785 }
1786
1787 if (ret == IIO_IOCTL_UNHANDLED)
1788 ret = -ENODEV;
1789
1790 out_unlock:
1791 mutex_unlock(&indio_dev->info_exist_lock);
1792
1793 return ret;
1794 }
1795
1796 static const struct file_operations iio_buffer_fileops = {
1797 .owner = THIS_MODULE,
1798 .llseek = noop_llseek,
1799 .read = iio_buffer_read_outer_addr,
1800 .poll = iio_buffer_poll_addr,
1801 .unlocked_ioctl = iio_ioctl,
1802 .compat_ioctl = compat_ptr_ioctl,
1803 .open = iio_chrdev_open,
1804 .release = iio_chrdev_release,
1805 };
1806
1807 static const struct file_operations iio_event_fileops = {
1808 .owner = THIS_MODULE,
1809 .llseek = noop_llseek,
1810 .unlocked_ioctl = iio_ioctl,
1811 .compat_ioctl = compat_ptr_ioctl,
1812 .open = iio_chrdev_open,
1813 .release = iio_chrdev_release,
1814 };
1815
iio_check_unique_scan_index(struct iio_dev * indio_dev)1816 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
1817 {
1818 int i, j;
1819 const struct iio_chan_spec *channels = indio_dev->channels;
1820
1821 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
1822 return 0;
1823
1824 for (i = 0; i < indio_dev->num_channels - 1; i++) {
1825 if (channels[i].scan_index < 0)
1826 continue;
1827 for (j = i + 1; j < indio_dev->num_channels; j++)
1828 if (channels[i].scan_index == channels[j].scan_index) {
1829 dev_err(&indio_dev->dev,
1830 "Duplicate scan index %d\n",
1831 channels[i].scan_index);
1832 return -EINVAL;
1833 }
1834 }
1835
1836 return 0;
1837 }
1838
1839 static const struct iio_buffer_setup_ops noop_ring_setup_ops;
1840
__iio_device_register(struct iio_dev * indio_dev,struct module * this_mod)1841 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
1842 {
1843 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1844 const char *label;
1845 int ret;
1846
1847 if (!indio_dev->info)
1848 return -EINVAL;
1849
1850 indio_dev->driver_module = this_mod;
1851 /* If the calling driver did not initialize of_node, do it here */
1852 if (!indio_dev->dev.of_node && indio_dev->dev.parent)
1853 indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1854
1855 label = of_get_property(indio_dev->dev.of_node, "label", NULL);
1856 if (label)
1857 indio_dev->label = label;
1858
1859 ret = iio_check_unique_scan_index(indio_dev);
1860 if (ret < 0)
1861 return ret;
1862
1863 iio_device_register_debugfs(indio_dev);
1864
1865 ret = iio_buffers_alloc_sysfs_and_mask(indio_dev);
1866 if (ret) {
1867 dev_err(indio_dev->dev.parent,
1868 "Failed to create buffer sysfs interfaces\n");
1869 goto error_unreg_debugfs;
1870 }
1871
1872 ret = iio_device_register_sysfs(indio_dev);
1873 if (ret) {
1874 dev_err(indio_dev->dev.parent,
1875 "Failed to register sysfs interfaces\n");
1876 goto error_buffer_free_sysfs;
1877 }
1878 ret = iio_device_register_eventset(indio_dev);
1879 if (ret) {
1880 dev_err(indio_dev->dev.parent,
1881 "Failed to register event set\n");
1882 goto error_free_sysfs;
1883 }
1884 if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
1885 iio_device_register_trigger_consumer(indio_dev);
1886
1887 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
1888 indio_dev->setup_ops == NULL)
1889 indio_dev->setup_ops = &noop_ring_setup_ops;
1890
1891 if (iio_dev_opaque->attached_buffers_cnt)
1892 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
1893 else if (iio_dev_opaque->event_interface)
1894 cdev_init(&indio_dev->chrdev, &iio_event_fileops);
1895
1896 if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) {
1897 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
1898 indio_dev->chrdev.owner = this_mod;
1899 }
1900
1901 /* assign device groups now; they should be all registered now */
1902 indio_dev->dev.groups = iio_dev_opaque->groups;
1903
1904 ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
1905 if (ret < 0)
1906 goto error_unreg_eventset;
1907
1908 return 0;
1909
1910 error_unreg_eventset:
1911 iio_device_unregister_eventset(indio_dev);
1912 error_free_sysfs:
1913 iio_device_unregister_sysfs(indio_dev);
1914 error_buffer_free_sysfs:
1915 iio_buffers_free_sysfs_and_mask(indio_dev);
1916 error_unreg_debugfs:
1917 iio_device_unregister_debugfs(indio_dev);
1918 return ret;
1919 }
1920 EXPORT_SYMBOL(__iio_device_register);
1921
1922 /**
1923 * iio_device_unregister() - unregister a device from the IIO subsystem
1924 * @indio_dev: Device structure representing the device.
1925 **/
iio_device_unregister(struct iio_dev * indio_dev)1926 void iio_device_unregister(struct iio_dev *indio_dev)
1927 {
1928 cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
1929
1930 mutex_lock(&indio_dev->info_exist_lock);
1931
1932 iio_device_unregister_debugfs(indio_dev);
1933
1934 iio_disable_all_buffers(indio_dev);
1935
1936 indio_dev->info = NULL;
1937
1938 iio_device_wakeup_eventset(indio_dev);
1939 iio_buffer_wakeup_poll(indio_dev);
1940
1941 mutex_unlock(&indio_dev->info_exist_lock);
1942
1943 iio_buffers_free_sysfs_and_mask(indio_dev);
1944 }
1945 EXPORT_SYMBOL(iio_device_unregister);
1946
devm_iio_device_unreg(struct device * dev,void * res)1947 static void devm_iio_device_unreg(struct device *dev, void *res)
1948 {
1949 iio_device_unregister(*(struct iio_dev **)res);
1950 }
1951
__devm_iio_device_register(struct device * dev,struct iio_dev * indio_dev,struct module * this_mod)1952 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
1953 struct module *this_mod)
1954 {
1955 struct iio_dev **ptr;
1956 int ret;
1957
1958 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
1959 if (!ptr)
1960 return -ENOMEM;
1961
1962 *ptr = indio_dev;
1963 ret = __iio_device_register(indio_dev, this_mod);
1964 if (!ret)
1965 devres_add(dev, ptr);
1966 else
1967 devres_free(ptr);
1968
1969 return ret;
1970 }
1971 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1972
1973 /**
1974 * iio_device_claim_direct_mode - Keep device in direct mode
1975 * @indio_dev: the iio_dev associated with the device
1976 *
1977 * If the device is in direct mode it is guaranteed to stay
1978 * that way until iio_device_release_direct_mode() is called.
1979 *
1980 * Use with iio_device_release_direct_mode()
1981 *
1982 * Returns: 0 on success, -EBUSY on failure
1983 */
iio_device_claim_direct_mode(struct iio_dev * indio_dev)1984 int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
1985 {
1986 mutex_lock(&indio_dev->mlock);
1987
1988 if (iio_buffer_enabled(indio_dev)) {
1989 mutex_unlock(&indio_dev->mlock);
1990 return -EBUSY;
1991 }
1992 return 0;
1993 }
1994 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
1995
1996 /**
1997 * iio_device_release_direct_mode - releases claim on direct mode
1998 * @indio_dev: the iio_dev associated with the device
1999 *
2000 * Release the claim. Device is no longer guaranteed to stay
2001 * in direct mode.
2002 *
2003 * Use with iio_device_claim_direct_mode()
2004 */
iio_device_release_direct_mode(struct iio_dev * indio_dev)2005 void iio_device_release_direct_mode(struct iio_dev *indio_dev)
2006 {
2007 mutex_unlock(&indio_dev->mlock);
2008 }
2009 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
2010
2011 subsys_initcall(iio_init);
2012 module_exit(iio_exit);
2013
2014 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
2015 MODULE_DESCRIPTION("Industrial I/O core");
2016 MODULE_LICENSE("GPL");
2017