Commit | Line | Data |
---|---|---|
c57f1ba7 JC |
1 | /* IIO - useful set of util functionality |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
37e3be9d CO |
9 | #ifndef _IIO_UTILS_H |
10 | #define _IIO_UTILS_H | |
c57f1ba7 | 11 | |
9d8ae6c8 JC |
12 | #include <string.h> |
13 | #include <stdlib.h> | |
e58537cc JC |
14 | #include <stdio.h> |
15 | #include <stdint.h> | |
bc9f35db | 16 | #include <dirent.h> |
bb23378c | 17 | #include <errno.h> |
bdcb31d0 RD |
18 | #include <ctype.h> |
19 | #include "iio_utils.h" | |
c57f1ba7 | 20 | |
9d8ae6c8 JC |
21 | const char *iio_dir = "/sys/bus/iio/devices/"; |
22 | ||
d9d7b990 IT |
23 | static char * const iio_direction[] = { |
24 | "in", | |
25 | "out", | |
26 | }; | |
27 | ||
e58537cc JC |
28 | /** |
29 | * iioutils_break_up_name() - extract generic name from full channel name | |
30 | * @full_name: the full channel name | |
31 | * @generic_name: the output generic channel name | |
5dc65d79 HK |
32 | * |
33 | * Returns 0 on success, or a negative error code if string extraction failed. | |
e58537cc | 34 | **/ |
bdcb31d0 | 35 | int iioutils_break_up_name(const char *full_name, |
e58537cc JC |
36 | char **generic_name) |
37 | { | |
38 | char *current; | |
39 | char *w, *r; | |
d9d7b990 | 40 | char *working, *prefix = ""; |
e9e45b43 | 41 | int i, ret; |
d9d7b990 IT |
42 | |
43 | for (i = 0; i < sizeof(iio_direction) / sizeof(iio_direction[0]); i++) | |
44 | if (!strncmp(full_name, iio_direction[i], | |
45 | strlen(iio_direction[i]))) { | |
46 | prefix = iio_direction[i]; | |
47 | break; | |
48 | } | |
79bdd48a | 49 | |
d9d7b990 | 50 | current = strdup(full_name + strlen(prefix) + 1); |
e9e45b43 HK |
51 | if (!current) |
52 | return -ENOMEM; | |
53 | ||
e58537cc | 54 | working = strtok(current, "_\0"); |
53118557 HK |
55 | if (!working) { |
56 | free(current); | |
57 | return -EINVAL; | |
58 | } | |
d9d7b990 | 59 | |
e58537cc JC |
60 | w = working; |
61 | r = working; | |
62 | ||
8b68bb20 | 63 | while (*r != '\0') { |
e58537cc JC |
64 | if (!isdigit(*r)) { |
65 | *w = *r; | |
66 | w++; | |
67 | } | |
68 | r++; | |
69 | } | |
70 | *w = '\0'; | |
e9e45b43 | 71 | ret = asprintf(generic_name, "%s_%s", prefix, working); |
e58537cc JC |
72 | free(current); |
73 | ||
e9e45b43 | 74 | return (ret == -1) ? -ENOMEM : 0; |
e58537cc JC |
75 | } |
76 | ||
e58537cc JC |
77 | /** |
78 | * iioutils_get_type() - find and process _type attribute data | |
79 | * @is_signed: output whether channel is signed | |
80 | * @bytes: output how many bytes the channel storage occupies | |
5dc65d79 HK |
81 | * @bits_used: output number of valid bits of data |
82 | * @shift: output amount of bits to shift right data before applying bit mask | |
e58537cc | 83 | * @mask: output a bit mask for the raw data |
5dc65d79 HK |
84 | * @be: output if data in big endian |
85 | * @device_dir: the IIO device directory | |
e58537cc JC |
86 | * @name: the channel name |
87 | * @generic_name: the channel type name | |
5dc65d79 HK |
88 | * |
89 | * Returns a value >= 0 on success, otherwise a negative error code. | |
e58537cc | 90 | **/ |
bdcb31d0 | 91 | int iioutils_get_type(unsigned *is_signed, |
e58537cc JC |
92 | unsigned *bytes, |
93 | unsigned *bits_used, | |
52615d47 | 94 | unsigned *shift, |
e58537cc | 95 | uint64_t *mask, |
117cf8b7 | 96 | unsigned *be, |
e58537cc JC |
97 | const char *device_dir, |
98 | const char *name, | |
99 | const char *generic_name) | |
100 | { | |
101 | FILE *sysfsfp; | |
102 | int ret; | |
103 | DIR *dp; | |
104 | char *scan_el_dir, *builtname, *builtname_generic, *filename = 0; | |
117cf8b7 | 105 | char signchar, endianchar; |
fc7f95a9 | 106 | unsigned padint; |
e58537cc JC |
107 | const struct dirent *ent; |
108 | ||
109 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); | |
0e799878 HK |
110 | if (ret < 0) |
111 | return -ENOMEM; | |
112 | ||
e58537cc JC |
113 | ret = asprintf(&builtname, FORMAT_TYPE_FILE, name); |
114 | if (ret < 0) { | |
115 | ret = -ENOMEM; | |
116 | goto error_free_scan_el_dir; | |
117 | } | |
118 | ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name); | |
119 | if (ret < 0) { | |
120 | ret = -ENOMEM; | |
121 | goto error_free_builtname; | |
122 | } | |
123 | ||
124 | dp = opendir(scan_el_dir); | |
125 | if (dp == NULL) { | |
126 | ret = -errno; | |
127 | goto error_free_builtname_generic; | |
128 | } | |
53118557 | 129 | ret = -ENOENT; |
e58537cc JC |
130 | while (ent = readdir(dp), ent != NULL) |
131 | /* | |
132 | * Do we allow devices to override a generic name with | |
133 | * a specific one? | |
134 | */ | |
135 | if ((strcmp(builtname, ent->d_name) == 0) || | |
136 | (strcmp(builtname_generic, ent->d_name) == 0)) { | |
137 | ret = asprintf(&filename, | |
138 | "%s/%s", scan_el_dir, ent->d_name); | |
139 | if (ret < 0) { | |
140 | ret = -ENOMEM; | |
141 | goto error_closedir; | |
142 | } | |
143 | sysfsfp = fopen(filename, "r"); | |
144 | if (sysfsfp == NULL) { | |
e58537cc | 145 | ret = -errno; |
2b6a6e67 | 146 | printf("failed to open %s\n", filename); |
e58537cc JC |
147 | goto error_free_filename; |
148 | } | |
a7f7c364 JC |
149 | |
150 | ret = fscanf(sysfsfp, | |
151 | "%ce:%c%u/%u>>%u", | |
152 | &endianchar, | |
153 | &signchar, | |
154 | bits_used, | |
155 | &padint, shift); | |
156 | if (ret < 0) { | |
578f737d | 157 | ret = -errno; |
2b6a6e67 | 158 | printf("failed to pass scan type description\n"); |
578f737d | 159 | goto error_close_sysfsfp; |
dc8b5d6e HK |
160 | } else if (ret != 5) { |
161 | ret = -EIO; | |
162 | printf("scan type description didn't match\n"); | |
163 | goto error_close_sysfsfp; | |
a7f7c364 | 164 | } |
117cf8b7 | 165 | *be = (endianchar == 'b'); |
e58537cc | 166 | *bytes = padint / 8; |
fc7f95a9 | 167 | if (*bits_used == 64) |
e58537cc JC |
168 | *mask = ~0; |
169 | else | |
170 | *mask = (1 << *bits_used) - 1; | |
33ebcb21 | 171 | *is_signed = (signchar == 's'); |
53118557 HK |
172 | if (fclose(sysfsfp)) { |
173 | ret = -errno; | |
174 | printf("Failed to close %s\n", filename); | |
175 | goto error_free_filename; | |
176 | } | |
177 | ||
ace76e42 | 178 | sysfsfp = 0; |
a7f7c364 JC |
179 | free(filename); |
180 | ||
181 | filename = 0; | |
e58537cc | 182 | } |
578f737d PM |
183 | error_close_sysfsfp: |
184 | if (sysfsfp) | |
53118557 HK |
185 | if (fclose(sysfsfp)) |
186 | perror("iioutils_get_type(): Failed to close file"); | |
187 | ||
e58537cc JC |
188 | error_free_filename: |
189 | if (filename) | |
190 | free(filename); | |
191 | error_closedir: | |
53118557 HK |
192 | if (closedir(dp) == -1) |
193 | perror("iioutils_get_type(): Failed to close directory"); | |
194 | ||
e58537cc JC |
195 | error_free_builtname_generic: |
196 | free(builtname_generic); | |
197 | error_free_builtname: | |
198 | free(builtname); | |
199 | error_free_scan_el_dir: | |
200 | free(scan_el_dir); | |
0e799878 | 201 | |
e58537cc JC |
202 | return ret; |
203 | } | |
204 | ||
5dc65d79 HK |
205 | /** |
206 | * iioutils_get_param_float() - read a float value from a channel parameter | |
207 | * @output: output the float value | |
208 | * @param_name: the parameter name to read | |
209 | * @device_dir: the IIO device directory in sysfs | |
210 | * @name: the channel name | |
211 | * @generic_name: the channel type name | |
212 | * | |
213 | * Returns a value >= 0 on success, otherwise a negative error code. | |
214 | **/ | |
bdcb31d0 | 215 | int iioutils_get_param_float(float *output, |
e58537cc JC |
216 | const char *param_name, |
217 | const char *device_dir, | |
218 | const char *name, | |
219 | const char *generic_name) | |
220 | { | |
221 | FILE *sysfsfp; | |
222 | int ret; | |
223 | DIR *dp; | |
224 | char *builtname, *builtname_generic; | |
225 | char *filename = NULL; | |
226 | const struct dirent *ent; | |
227 | ||
228 | ret = asprintf(&builtname, "%s_%s", name, param_name); | |
0e799878 HK |
229 | if (ret < 0) |
230 | return -ENOMEM; | |
231 | ||
e58537cc JC |
232 | ret = asprintf(&builtname_generic, |
233 | "%s_%s", generic_name, param_name); | |
234 | if (ret < 0) { | |
235 | ret = -ENOMEM; | |
236 | goto error_free_builtname; | |
237 | } | |
238 | dp = opendir(device_dir); | |
239 | if (dp == NULL) { | |
240 | ret = -errno; | |
241 | goto error_free_builtname_generic; | |
242 | } | |
53118557 | 243 | ret = -ENOENT; |
e58537cc JC |
244 | while (ent = readdir(dp), ent != NULL) |
245 | if ((strcmp(builtname, ent->d_name) == 0) || | |
246 | (strcmp(builtname_generic, ent->d_name) == 0)) { | |
247 | ret = asprintf(&filename, | |
248 | "%s/%s", device_dir, ent->d_name); | |
249 | if (ret < 0) { | |
250 | ret = -ENOMEM; | |
251 | goto error_closedir; | |
252 | } | |
253 | sysfsfp = fopen(filename, "r"); | |
254 | if (!sysfsfp) { | |
255 | ret = -errno; | |
256 | goto error_free_filename; | |
257 | } | |
53118557 HK |
258 | errno = 0; |
259 | if (fscanf(sysfsfp, "%f", output) != 1) | |
260 | ret = errno ? -errno : -ENODATA; | |
261 | ||
e58537cc JC |
262 | break; |
263 | } | |
264 | error_free_filename: | |
265 | if (filename) | |
266 | free(filename); | |
267 | error_closedir: | |
53118557 HK |
268 | if (closedir(dp) == -1) |
269 | perror("iioutils_get_param_float(): Failed to close directory"); | |
270 | ||
e58537cc JC |
271 | error_free_builtname_generic: |
272 | free(builtname_generic); | |
273 | error_free_builtname: | |
274 | free(builtname); | |
0e799878 | 275 | |
e58537cc JC |
276 | return ret; |
277 | } | |
278 | ||
8b68bb20 | 279 | /** |
5dc65d79 HK |
280 | * bsort_channel_array_by_index() - sort the array in index order |
281 | * @ci_array: the iio_channel_info array to be sorted | |
282 | * @cnt: the amount of array elements | |
8b68bb20 MH |
283 | **/ |
284 | ||
bdcb31d0 | 285 | void bsort_channel_array_by_index(struct iio_channel_info **ci_array, |
8b68bb20 MH |
286 | int cnt) |
287 | { | |
288 | ||
289 | struct iio_channel_info temp; | |
290 | int x, y; | |
291 | ||
292 | for (x = 0; x < cnt; x++) | |
293 | for (y = 0; y < (cnt - 1); y++) | |
294 | if ((*ci_array)[y].index > (*ci_array)[y+1].index) { | |
295 | temp = (*ci_array)[y + 1]; | |
296 | (*ci_array)[y + 1] = (*ci_array)[y]; | |
297 | (*ci_array)[y] = temp; | |
298 | } | |
299 | } | |
e58537cc JC |
300 | |
301 | /** | |
302 | * build_channel_array() - function to figure out what channels are present | |
303 | * @device_dir: the IIO device directory in sysfs | |
5dc65d79 HK |
304 | * @ci_array: output the resulting array of iio_channel_info |
305 | * @counter: output the amount of array elements | |
306 | * | |
307 | * Returns 0 on success, otherwise a negative error code. | |
e58537cc | 308 | **/ |
bdcb31d0 | 309 | int build_channel_array(const char *device_dir, |
e58537cc JC |
310 | struct iio_channel_info **ci_array, |
311 | int *counter) | |
312 | { | |
313 | DIR *dp; | |
314 | FILE *sysfsfp; | |
1e7c3478 | 315 | int count = 0, i; |
e58537cc JC |
316 | struct iio_channel_info *current; |
317 | int ret; | |
318 | const struct dirent *ent; | |
319 | char *scan_el_dir; | |
320 | char *filename; | |
321 | ||
322 | *counter = 0; | |
323 | ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir); | |
0e799878 HK |
324 | if (ret < 0) |
325 | return -ENOMEM; | |
326 | ||
e58537cc JC |
327 | dp = opendir(scan_el_dir); |
328 | if (dp == NULL) { | |
329 | ret = -errno; | |
330 | goto error_free_name; | |
331 | } | |
332 | while (ent = readdir(dp), ent != NULL) | |
333 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), | |
334 | "_en") == 0) { | |
335 | ret = asprintf(&filename, | |
336 | "%s/%s", scan_el_dir, ent->d_name); | |
337 | if (ret < 0) { | |
338 | ret = -ENOMEM; | |
339 | goto error_close_dir; | |
340 | } | |
341 | sysfsfp = fopen(filename, "r"); | |
342 | if (sysfsfp == NULL) { | |
343 | ret = -errno; | |
344 | free(filename); | |
345 | goto error_close_dir; | |
346 | } | |
53118557 HK |
347 | errno = 0; |
348 | if (fscanf(sysfsfp, "%i", &ret) != 1) { | |
349 | ret = errno ? -errno : -ENODATA; | |
350 | if (fclose(sysfsfp)) | |
351 | perror("build_channel_array(): Failed to close file"); | |
352 | ||
353 | free(filename); | |
354 | goto error_close_dir; | |
355 | } | |
356 | ||
e58537cc JC |
357 | if (ret == 1) |
358 | (*counter)++; | |
53118557 HK |
359 | if (fclose(sysfsfp)) { |
360 | ret = -errno; | |
361 | free(filename); | |
362 | goto error_close_dir; | |
363 | } | |
364 | ||
e58537cc JC |
365 | free(filename); |
366 | } | |
8b68bb20 | 367 | *ci_array = malloc(sizeof(**ci_array) * (*counter)); |
e58537cc JC |
368 | if (*ci_array == NULL) { |
369 | ret = -ENOMEM; | |
370 | goto error_close_dir; | |
371 | } | |
372 | seekdir(dp, 0); | |
373 | while (ent = readdir(dp), ent != NULL) { | |
374 | if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), | |
375 | "_en") == 0) { | |
66c65d90 | 376 | int current_enabled = 0; |
79bdd48a | 377 | |
e58537cc JC |
378 | current = &(*ci_array)[count++]; |
379 | ret = asprintf(&filename, | |
380 | "%s/%s", scan_el_dir, ent->d_name); | |
381 | if (ret < 0) { | |
382 | ret = -ENOMEM; | |
383 | /* decrement count to avoid freeing name */ | |
384 | count--; | |
385 | goto error_cleanup_array; | |
386 | } | |
387 | sysfsfp = fopen(filename, "r"); | |
388 | if (sysfsfp == NULL) { | |
e58537cc | 389 | ret = -errno; |
2b6a6e67 | 390 | free(filename); |
121b5e50 | 391 | count--; |
e58537cc JC |
392 | goto error_cleanup_array; |
393 | } | |
53118557 HK |
394 | errno = 0; |
395 | if (fscanf(sysfsfp, "%i", ¤t_enabled) != 1) { | |
396 | ret = errno ? -errno : -ENODATA; | |
397 | free(filename); | |
398 | count--; | |
399 | goto error_cleanup_array; | |
400 | } | |
401 | ||
402 | if (fclose(sysfsfp)) { | |
403 | ret = -errno; | |
404 | free(filename); | |
405 | count--; | |
406 | goto error_cleanup_array; | |
407 | } | |
8b68bb20 | 408 | |
66c65d90 | 409 | if (!current_enabled) { |
8b68bb20 MH |
410 | free(filename); |
411 | count--; | |
412 | continue; | |
413 | } | |
414 | ||
e58537cc JC |
415 | current->scale = 1.0; |
416 | current->offset = 0; | |
417 | current->name = strndup(ent->d_name, | |
418 | strlen(ent->d_name) - | |
419 | strlen("_en")); | |
420 | if (current->name == NULL) { | |
421 | free(filename); | |
422 | ret = -ENOMEM; | |
121b5e50 | 423 | count--; |
e58537cc JC |
424 | goto error_cleanup_array; |
425 | } | |
426 | /* Get the generic and specific name elements */ | |
427 | ret = iioutils_break_up_name(current->name, | |
428 | ¤t->generic_name); | |
429 | if (ret) { | |
430 | free(filename); | |
121b5e50 HK |
431 | free(current->name); |
432 | count--; | |
e58537cc JC |
433 | goto error_cleanup_array; |
434 | } | |
435 | ret = asprintf(&filename, | |
436 | "%s/%s_index", | |
437 | scan_el_dir, | |
438 | current->name); | |
439 | if (ret < 0) { | |
440 | free(filename); | |
441 | ret = -ENOMEM; | |
442 | goto error_cleanup_array; | |
443 | } | |
444 | sysfsfp = fopen(filename, "r"); | |
53118557 HK |
445 | if (sysfsfp == NULL) { |
446 | ret = -errno; | |
447 | printf("failed to open %s\n", filename); | |
448 | free(filename); | |
449 | goto error_cleanup_array; | |
450 | } | |
451 | ||
452 | errno = 0; | |
453 | if (fscanf(sysfsfp, "%u", ¤t->index) != 1) { | |
454 | ret = errno ? -errno : -ENODATA; | |
455 | if (fclose(sysfsfp)) | |
456 | perror("build_channel_array(): Failed to close file"); | |
457 | ||
458 | free(filename); | |
459 | goto error_cleanup_array; | |
460 | } | |
461 | ||
462 | if (fclose(sysfsfp)) { | |
463 | ret = -errno; | |
464 | free(filename); | |
465 | goto error_cleanup_array; | |
466 | } | |
467 | ||
e58537cc JC |
468 | free(filename); |
469 | /* Find the scale */ | |
470 | ret = iioutils_get_param_float(¤t->scale, | |
471 | "scale", | |
472 | device_dir, | |
473 | current->name, | |
474 | current->generic_name); | |
475 | if (ret < 0) | |
476 | goto error_cleanup_array; | |
477 | ret = iioutils_get_param_float(¤t->offset, | |
478 | "offset", | |
479 | device_dir, | |
480 | current->name, | |
481 | current->generic_name); | |
482 | if (ret < 0) | |
483 | goto error_cleanup_array; | |
484 | ret = iioutils_get_type(¤t->is_signed, | |
485 | ¤t->bytes, | |
486 | ¤t->bits_used, | |
52615d47 | 487 | ¤t->shift, |
e58537cc | 488 | ¤t->mask, |
117cf8b7 | 489 | ¤t->be, |
e58537cc JC |
490 | device_dir, |
491 | current->name, | |
492 | current->generic_name); | |
53118557 HK |
493 | if (ret < 0) |
494 | goto error_cleanup_array; | |
e58537cc JC |
495 | } |
496 | } | |
8b68bb20 | 497 | |
53118557 HK |
498 | if (closedir(dp) == -1) { |
499 | ret = -errno; | |
500 | goto error_cleanup_array; | |
501 | } | |
502 | ||
66dd08fd | 503 | free(scan_el_dir); |
8b68bb20 MH |
504 | /* reorder so that the array is in index order */ |
505 | bsort_channel_array_by_index(ci_array, *counter); | |
e58537cc JC |
506 | |
507 | return 0; | |
508 | ||
509 | error_cleanup_array: | |
63f05c85 | 510 | for (i = count - 1; i >= 0; i--) { |
e58537cc | 511 | free((*ci_array)[i].name); |
63f05c85 HK |
512 | free((*ci_array)[i].generic_name); |
513 | } | |
e58537cc JC |
514 | free(*ci_array); |
515 | error_close_dir: | |
53118557 HK |
516 | if (dp) |
517 | if (closedir(dp) == -1) | |
518 | perror("build_channel_array(): Failed to close dir"); | |
519 | ||
e58537cc JC |
520 | error_free_name: |
521 | free(scan_el_dir); | |
0e799878 | 522 | |
e58537cc JC |
523 | return ret; |
524 | } | |
525 | ||
096f9b86 HK |
526 | int calc_digits(int num) |
527 | { | |
528 | int count = 0; | |
529 | ||
530 | while (num != 0) { | |
531 | num /= 10; | |
532 | count++; | |
533 | } | |
534 | ||
535 | return count; | |
536 | } | |
537 | ||
9d8ae6c8 JC |
538 | /** |
539 | * find_type_by_name() - function to match top level types by name | |
540 | * @name: top level type instance name | |
5dc65d79 | 541 | * @type: the type of top level instance being searched |
9d8ae6c8 | 542 | * |
5dc65d79 HK |
543 | * Returns the device number of a matched IIO device on success, otherwise a |
544 | * negative error code. | |
9d8ae6c8 JC |
545 | * Typical types this is used for are device and trigger. |
546 | **/ | |
bdcb31d0 | 547 | int find_type_by_name(const char *name, const char *type) |
c57f1ba7 | 548 | { |
c57f1ba7 | 549 | const struct dirent *ent; |
096f9b86 | 550 | int number, numstrlen, ret; |
c57f1ba7 JC |
551 | |
552 | FILE *nameFile; | |
553 | DIR *dp; | |
9d8ae6c8 JC |
554 | char thisname[IIO_MAX_NAME_LENGTH]; |
555 | char *filename; | |
9d8ae6c8 | 556 | |
c57f1ba7 JC |
557 | dp = opendir(iio_dir); |
558 | if (dp == NULL) { | |
c866ffc7 | 559 | printf("No industrialio devices available\n"); |
9d8ae6c8 | 560 | return -ENODEV; |
c57f1ba7 | 561 | } |
9d8ae6c8 | 562 | |
c57f1ba7 | 563 | while (ent = readdir(dp), ent != NULL) { |
c57f1ba7 | 564 | if (strcmp(ent->d_name, ".") != 0 && |
9d8ae6c8 JC |
565 | strcmp(ent->d_name, "..") != 0 && |
566 | strlen(ent->d_name) > strlen(type) && | |
567 | strncmp(ent->d_name, type, strlen(type)) == 0) { | |
096f9b86 HK |
568 | errno = 0; |
569 | ret = sscanf(ent->d_name + strlen(type), "%d", &number); | |
570 | if (ret < 0) { | |
571 | ret = -errno; | |
572 | printf("failed to read element number\n"); | |
573 | goto error_close_dir; | |
574 | } else if (ret != 1) { | |
575 | ret = -EIO; | |
576 | printf("failed to match element number\n"); | |
577 | goto error_close_dir; | |
578 | } | |
579 | ||
580 | numstrlen = calc_digits(number); | |
9d8ae6c8 JC |
581 | /* verify the next character is not a colon */ |
582 | if (strncmp(ent->d_name + strlen(type) + numstrlen, | |
583 | ":", | |
584 | 1) != 0) { | |
585 | filename = malloc(strlen(iio_dir) | |
586 | + strlen(type) | |
9d8ae6c8 | 587 | + numstrlen |
b6ee30a2 | 588 | + 6); |
a4d429e3 | 589 | if (filename == NULL) { |
53118557 HK |
590 | ret = -ENOMEM; |
591 | goto error_close_dir; | |
592 | } | |
593 | ||
594 | ret = sprintf(filename, "%s%s%d/name", iio_dir, | |
595 | type, number); | |
596 | if (ret < 0) { | |
597 | free(filename); | |
598 | goto error_close_dir; | |
a4d429e3 | 599 | } |
53118557 | 600 | |
9d8ae6c8 | 601 | nameFile = fopen(filename, "r"); |
a4d429e3 PM |
602 | if (!nameFile) { |
603 | free(filename); | |
9d8ae6c8 | 604 | continue; |
a4d429e3 | 605 | } |
9d8ae6c8 | 606 | free(filename); |
53118557 HK |
607 | errno = 0; |
608 | if (fscanf(nameFile, "%s", thisname) != 1) { | |
609 | ret = errno ? -errno : -ENODATA; | |
610 | goto error_close_dir; | |
611 | } | |
612 | ||
613 | if (fclose(nameFile)) { | |
614 | ret = -errno; | |
615 | goto error_close_dir; | |
616 | } | |
617 | ||
a4d429e3 | 618 | if (strcmp(name, thisname) == 0) { |
53118557 HK |
619 | if (closedir(dp) == -1) |
620 | return -errno; | |
a4d429e3 PM |
621 | return number; |
622 | } | |
c57f1ba7 JC |
623 | } |
624 | } | |
625 | } | |
53118557 HK |
626 | if (closedir(dp) == -1) |
627 | return -errno; | |
628 | ||
9d8ae6c8 | 629 | return -ENODEV; |
096f9b86 HK |
630 | |
631 | error_close_dir: | |
632 | if (closedir(dp) == -1) | |
633 | perror("find_type_by_name(): Failed to close directory"); | |
634 | return ret; | |
c57f1ba7 JC |
635 | } |
636 | ||
9d475254 HK |
637 | static int _write_sysfs_int(const char *filename, const char *basedir, int val, |
638 | int verify) | |
c57f1ba7 | 639 | { |
11cb454f | 640 | int ret = 0; |
9d8ae6c8 JC |
641 | FILE *sysfsfp; |
642 | int test; | |
643 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); | |
79bdd48a | 644 | |
9d8ae6c8 JC |
645 | if (temp == NULL) |
646 | return -ENOMEM; | |
53118557 HK |
647 | ret = sprintf(temp, "%s/%s", basedir, filename); |
648 | if (ret < 0) | |
649 | goto error_free; | |
650 | ||
c57f1ba7 | 651 | sysfsfp = fopen(temp, "w"); |
9d8ae6c8 | 652 | if (sysfsfp == NULL) { |
9d8ae6c8 | 653 | ret = -errno; |
2b6a6e67 | 654 | printf("failed to open %s\n", temp); |
9d8ae6c8 JC |
655 | goto error_free; |
656 | } | |
53118557 HK |
657 | ret = fprintf(sysfsfp, "%d", val); |
658 | if (ret < 0) { | |
659 | if (fclose(sysfsfp)) | |
660 | perror("_write_sysfs_int(): Failed to close dir"); | |
661 | ||
662 | goto error_free; | |
663 | } | |
664 | ||
665 | if (fclose(sysfsfp)) { | |
666 | ret = -errno; | |
667 | goto error_free; | |
668 | } | |
669 | ||
9d8ae6c8 JC |
670 | if (verify) { |
671 | sysfsfp = fopen(temp, "r"); | |
672 | if (sysfsfp == NULL) { | |
9d8ae6c8 | 673 | ret = -errno; |
2b6a6e67 | 674 | printf("failed to open %s\n", temp); |
9d8ae6c8 JC |
675 | goto error_free; |
676 | } | |
53118557 HK |
677 | if (fscanf(sysfsfp, "%d", &test) != 1) { |
678 | ret = errno ? -errno : -ENODATA; | |
679 | if (fclose(sysfsfp)) | |
680 | perror("_write_sysfs_int(): Failed to close dir"); | |
681 | ||
682 | goto error_free; | |
683 | } | |
684 | ||
685 | if (fclose(sysfsfp)) { | |
686 | ret = -errno; | |
687 | goto error_free; | |
688 | } | |
689 | ||
9d8ae6c8 JC |
690 | if (test != val) { |
691 | printf("Possible failure in int write %d to %s%s\n", | |
692 | val, | |
693 | basedir, | |
694 | filename); | |
695 | ret = -1; | |
696 | } | |
697 | } | |
698 | error_free: | |
699 | free(temp); | |
700 | return ret; | |
701 | } | |
702 | ||
5dc65d79 HK |
703 | /** |
704 | * write_sysfs_int() - write an integer value to a sysfs file | |
705 | * @filename: name of the file to write to | |
706 | * @basedir: the sysfs directory in which the file is to be found | |
707 | * @val: integer value to write to file | |
708 | * | |
709 | * Returns a value >= 0 on success, otherwise a negative error code. | |
710 | **/ | |
9d475254 | 711 | int write_sysfs_int(const char *filename, const char *basedir, int val) |
9d8ae6c8 JC |
712 | { |
713 | return _write_sysfs_int(filename, basedir, val, 0); | |
c57f1ba7 JC |
714 | } |
715 | ||
5dc65d79 HK |
716 | /** |
717 | * write_sysfs_int_and_verify() - write an integer value to a sysfs file | |
718 | * and verify | |
719 | * @filename: name of the file to write to | |
720 | * @basedir: the sysfs directory in which the file is to be found | |
721 | * @val: integer value to write to file | |
722 | * | |
723 | * Returns a value >= 0 on success, otherwise a negative error code. | |
724 | **/ | |
9d475254 HK |
725 | int write_sysfs_int_and_verify(const char *filename, const char *basedir, |
726 | int val) | |
9d8ae6c8 JC |
727 | { |
728 | return _write_sysfs_int(filename, basedir, val, 1); | |
729 | } | |
730 | ||
9d475254 HK |
731 | static int _write_sysfs_string(const char *filename, const char *basedir, |
732 | const char *val, int verify) | |
eaf86ff9 | 733 | { |
e58537cc | 734 | int ret = 0; |
eaf86ff9 | 735 | FILE *sysfsfp; |
9d8ae6c8 | 736 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
79bdd48a | 737 | |
9d8ae6c8 JC |
738 | if (temp == NULL) { |
739 | printf("Memory allocation failed\n"); | |
740 | return -ENOMEM; | |
741 | } | |
53118557 HK |
742 | ret = sprintf(temp, "%s/%s", basedir, filename); |
743 | if (ret < 0) | |
744 | goto error_free; | |
745 | ||
eaf86ff9 | 746 | sysfsfp = fopen(temp, "w"); |
9d8ae6c8 | 747 | if (sysfsfp == NULL) { |
9d8ae6c8 | 748 | ret = -errno; |
2b6a6e67 | 749 | printf("Could not open %s\n", temp); |
9d8ae6c8 JC |
750 | goto error_free; |
751 | } | |
53118557 HK |
752 | ret = fprintf(sysfsfp, "%s", val); |
753 | if (ret < 0) { | |
754 | if (fclose(sysfsfp)) | |
755 | perror("_write_sysfs_string(): Failed to close dir"); | |
756 | ||
757 | goto error_free; | |
758 | } | |
759 | ||
760 | if (fclose(sysfsfp)) { | |
761 | ret = -errno; | |
762 | goto error_free; | |
763 | } | |
764 | ||
9d8ae6c8 JC |
765 | if (verify) { |
766 | sysfsfp = fopen(temp, "r"); | |
767 | if (sysfsfp == NULL) { | |
768 | ret = -errno; | |
2b6a6e67 | 769 | printf("could not open file to verify\n"); |
9d8ae6c8 JC |
770 | goto error_free; |
771 | } | |
53118557 HK |
772 | if (fscanf(sysfsfp, "%s", temp) != 1) { |
773 | ret = errno ? -errno : -ENODATA; | |
774 | if (fclose(sysfsfp)) | |
775 | perror("_write_sysfs_string(): Failed to close dir"); | |
776 | ||
777 | goto error_free; | |
778 | } | |
779 | ||
780 | if (fclose(sysfsfp)) { | |
781 | ret = -errno; | |
782 | goto error_free; | |
783 | } | |
784 | ||
9d8ae6c8 JC |
785 | if (strcmp(temp, val) != 0) { |
786 | printf("Possible failure in string write of %s " | |
787 | "Should be %s " | |
25985edc | 788 | "written to %s\%s\n", |
9d8ae6c8 JC |
789 | temp, |
790 | val, | |
791 | basedir, | |
792 | filename); | |
793 | ret = -1; | |
794 | } | |
eaf86ff9 | 795 | } |
9d8ae6c8 JC |
796 | error_free: |
797 | free(temp); | |
eaf86ff9 | 798 | |
9d8ae6c8 | 799 | return ret; |
eaf86ff9 | 800 | } |
e58537cc | 801 | |
c57f1ba7 JC |
802 | /** |
803 | * write_sysfs_string_and_verify() - string write, readback and verify | |
804 | * @filename: name of file to write to | |
805 | * @basedir: the sysfs directory in which the file is to be found | |
806 | * @val: the string to write | |
5dc65d79 HK |
807 | * |
808 | * Returns a value >= 0 on success, otherwise a negative error code. | |
c57f1ba7 | 809 | **/ |
9d475254 HK |
810 | int write_sysfs_string_and_verify(const char *filename, const char *basedir, |
811 | const char *val) | |
c57f1ba7 | 812 | { |
9d8ae6c8 JC |
813 | return _write_sysfs_string(filename, basedir, val, 1); |
814 | } | |
c57f1ba7 | 815 | |
5dc65d79 HK |
816 | /** |
817 | * write_sysfs_string() - write string to a sysfs file | |
818 | * @filename: name of file to write to | |
819 | * @basedir: the sysfs directory in which the file is to be found | |
820 | * @val: the string to write | |
821 | * | |
822 | * Returns a value >= 0 on success, otherwise a negative error code. | |
823 | **/ | |
9d475254 HK |
824 | int write_sysfs_string(const char *filename, const char *basedir, |
825 | const char *val) | |
9d8ae6c8 JC |
826 | { |
827 | return _write_sysfs_string(filename, basedir, val, 0); | |
c57f1ba7 JC |
828 | } |
829 | ||
5dc65d79 HK |
830 | /** |
831 | * read_sysfs_posint() - read an integer value from file | |
832 | * @filename: name of file to read from | |
833 | * @basedir: the sysfs directory in which the file is to be found | |
834 | * | |
835 | * Returns the read integer value >= 0 on success, otherwise a negative error | |
836 | * code. | |
837 | **/ | |
9d475254 | 838 | int read_sysfs_posint(const char *filename, const char *basedir) |
c57f1ba7 JC |
839 | { |
840 | int ret; | |
841 | FILE *sysfsfp; | |
9d8ae6c8 | 842 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); |
79bdd48a | 843 | |
9d8ae6c8 JC |
844 | if (temp == NULL) { |
845 | printf("Memory allocation failed"); | |
846 | return -ENOMEM; | |
847 | } | |
53118557 HK |
848 | ret = sprintf(temp, "%s/%s", basedir, filename); |
849 | if (ret < 0) | |
850 | goto error_free; | |
851 | ||
c57f1ba7 | 852 | sysfsfp = fopen(temp, "r"); |
9d8ae6c8 JC |
853 | if (sysfsfp == NULL) { |
854 | ret = -errno; | |
855 | goto error_free; | |
856 | } | |
53118557 HK |
857 | errno = 0; |
858 | if (fscanf(sysfsfp, "%d\n", &ret) != 1) { | |
859 | ret = errno ? -errno : -ENODATA; | |
860 | if (fclose(sysfsfp)) | |
861 | perror("read_sysfs_posint(): Failed to close dir"); | |
862 | ||
863 | goto error_free; | |
864 | } | |
865 | ||
866 | if (fclose(sysfsfp)) | |
867 | ret = -errno; | |
868 | ||
9d8ae6c8 JC |
869 | error_free: |
870 | free(temp); | |
871 | return ret; | |
872 | } | |
873 | ||
5dc65d79 HK |
874 | /** |
875 | * read_sysfs_float() - read a float value from file | |
876 | * @filename: name of file to read from | |
877 | * @basedir: the sysfs directory in which the file is to be found | |
878 | * @val: output the read float value | |
879 | * | |
880 | * Returns a value >= 0 on success, otherwise a negative error code. | |
881 | **/ | |
9d475254 | 882 | int read_sysfs_float(const char *filename, const char *basedir, float *val) |
9d8ae6c8 | 883 | { |
f5709d5f | 884 | int ret = 0; |
9d8ae6c8 JC |
885 | FILE *sysfsfp; |
886 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); | |
79bdd48a | 887 | |
9d8ae6c8 JC |
888 | if (temp == NULL) { |
889 | printf("Memory allocation failed"); | |
890 | return -ENOMEM; | |
891 | } | |
53118557 HK |
892 | ret = sprintf(temp, "%s/%s", basedir, filename); |
893 | if (ret < 0) | |
894 | goto error_free; | |
895 | ||
9d8ae6c8 JC |
896 | sysfsfp = fopen(temp, "r"); |
897 | if (sysfsfp == NULL) { | |
898 | ret = -errno; | |
899 | goto error_free; | |
900 | } | |
53118557 HK |
901 | errno = 0; |
902 | if (fscanf(sysfsfp, "%f\n", val) != 1) { | |
903 | ret = errno ? -errno : -ENODATA; | |
904 | if (fclose(sysfsfp)) | |
905 | perror("read_sysfs_float(): Failed to close dir"); | |
906 | ||
907 | goto error_free; | |
908 | } | |
909 | ||
910 | if (fclose(sysfsfp)) | |
911 | ret = -errno; | |
912 | ||
9d8ae6c8 JC |
913 | error_free: |
914 | free(temp); | |
c57f1ba7 JC |
915 | return ret; |
916 | } | |
49d916ec | 917 | |
5dc65d79 HK |
918 | /** |
919 | * read_sysfs_string() - read a string from file | |
920 | * @filename: name of file to read from | |
921 | * @basedir: the sysfs directory in which the file is to be found | |
922 | * @str: output the read string | |
923 | * | |
924 | * Returns a value >= 0 on success, otherwise a negative error code. | |
925 | **/ | |
f5709d5f | 926 | int read_sysfs_string(const char *filename, const char *basedir, char *str) |
49d916ec | 927 | { |
f5709d5f | 928 | int ret = 0; |
49d916ec MS |
929 | FILE *sysfsfp; |
930 | char *temp = malloc(strlen(basedir) + strlen(filename) + 2); | |
79bdd48a | 931 | |
49d916ec MS |
932 | if (temp == NULL) { |
933 | printf("Memory allocation failed"); | |
934 | return -ENOMEM; | |
935 | } | |
53118557 HK |
936 | ret = sprintf(temp, "%s/%s", basedir, filename); |
937 | if (ret < 0) | |
938 | goto error_free; | |
939 | ||
49d916ec MS |
940 | sysfsfp = fopen(temp, "r"); |
941 | if (sysfsfp == NULL) { | |
942 | ret = -errno; | |
943 | goto error_free; | |
944 | } | |
53118557 HK |
945 | errno = 0; |
946 | if (fscanf(sysfsfp, "%s\n", str) != 1) { | |
947 | ret = errno ? -errno : -ENODATA; | |
948 | if (fclose(sysfsfp)) | |
949 | perror("read_sysfs_string(): Failed to close dir"); | |
950 | ||
951 | goto error_free; | |
952 | } | |
953 | ||
954 | if (fclose(sysfsfp)) | |
955 | ret = -errno; | |
956 | ||
49d916ec MS |
957 | error_free: |
958 | free(temp); | |
959 | return ret; | |
960 | } | |
37e3be9d CO |
961 | |
962 | #endif /* _IIO_UTILS_H */ |