Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e58537cc JC |
2 | /* Industrialio buffer test code. |
3 | * | |
4 | * Copyright (c) 2008 Jonathan Cameron | |
5 | * | |
e58537cc JC |
6 | * This program is primarily intended as an example application. |
7 | * Reads the current buffer setup from sysfs and starts a short capture | |
8 | * from the specified device, pretty printing the result after appropriate | |
9 | * conversion. | |
10 | * | |
11 | * Command line parameters | |
12 | * generic_buffer -n <device_name> -t <trigger_name> | |
13 | * If trigger name is not specified the program assumes you want a dataready | |
14 | * trigger associated with the device and goes looking for it. | |
e58537cc JC |
15 | */ |
16 | ||
17 | #include <unistd.h> | |
bdcb31d0 | 18 | #include <stdlib.h> |
e58537cc JC |
19 | #include <dirent.h> |
20 | #include <fcntl.h> | |
21 | #include <stdio.h> | |
22 | #include <errno.h> | |
23 | #include <sys/stat.h> | |
24 | #include <sys/dir.h> | |
25 | #include <linux/types.h> | |
30268a3d | 26 | #include <string.h> |
52615d47 | 27 | #include <poll.h> |
117cf8b7 | 28 | #include <endian.h> |
bb23378c | 29 | #include <getopt.h> |
1bcdfbcf | 30 | #include <inttypes.h> |
4f20d592 CDL |
31 | #include <stdbool.h> |
32 | #include <signal.h> | |
8827faab AA |
33 | #include <sys/ioctl.h> |
34 | #include <linux/iio/buffer.h> | |
e58537cc JC |
35 | #include "iio_utils.h" |
36 | ||
5f991a92 LW |
37 | /** |
38 | * enum autochan - state for the automatic channel enabling mechanism | |
39 | */ | |
40 | enum autochan { | |
41 | AUTOCHANNELS_DISABLED, | |
42 | AUTOCHANNELS_ENABLED, | |
43 | AUTOCHANNELS_ACTIVE, | |
44 | }; | |
45 | ||
e58537cc JC |
46 | /** |
47 | * size_from_channelarray() - calculate the storage size of a scan | |
d8da0eee PM |
48 | * @channels: the channel info array |
49 | * @num_channels: number of channels | |
e58537cc JC |
50 | * |
51 | * Has the side effect of filling the channels[i].location values used | |
52 | * in processing the buffer output. | |
53 | **/ | |
ebe51125 | 54 | static int size_from_channelarray(struct iio_channel_info *channels, int num_channels) |
e58537cc JC |
55 | { |
56 | int bytes = 0; | |
57 | int i = 0; | |
ff39a252 | 58 | |
e58537cc JC |
59 | while (i < num_channels) { |
60 | if (bytes % channels[i].bytes == 0) | |
61 | channels[i].location = bytes; | |
62 | else | |
7663a4aa HK |
63 | channels[i].location = bytes - bytes % channels[i].bytes |
64 | + channels[i].bytes; | |
65 | ||
e58537cc JC |
66 | bytes = channels[i].location + channels[i].bytes; |
67 | i++; | |
68 | } | |
7663a4aa | 69 | |
e58537cc JC |
70 | return bytes; |
71 | } | |
72 | ||
ebe51125 | 73 | static void print1byte(uint8_t input, struct iio_channel_info *info) |
e8d0927a TB |
74 | { |
75 | /* | |
76 | * Shift before conversion to avoid sign extension | |
77 | * of left aligned data | |
78 | */ | |
79 | input >>= info->shift; | |
80 | input &= info->mask; | |
81 | if (info->is_signed) { | |
82 | int8_t val = (int8_t)(input << (8 - info->bits_used)) >> | |
83 | (8 - info->bits_used); | |
84 | printf("%05f ", ((float)val + info->offset) * info->scale); | |
85 | } else { | |
86 | printf("%05f ", ((float)input + info->offset) * info->scale); | |
87 | } | |
88 | } | |
89 | ||
ebe51125 | 90 | static void print2byte(uint16_t input, struct iio_channel_info *info) |
52615d47 | 91 | { |
117cf8b7 | 92 | /* First swap if incorrect endian */ |
117cf8b7 | 93 | if (info->be) |
8e926134 | 94 | input = be16toh(input); |
117cf8b7 | 95 | else |
8e926134 | 96 | input = le16toh(input); |
117cf8b7 | 97 | |
d8da0eee PM |
98 | /* |
99 | * Shift before conversion to avoid sign extension | |
100 | * of left aligned data | |
101 | */ | |
1525ecfc | 102 | input >>= info->shift; |
8e926134 | 103 | input &= info->mask; |
52615d47 | 104 | if (info->is_signed) { |
8e926134 HK |
105 | int16_t val = (int16_t)(input << (16 - info->bits_used)) >> |
106 | (16 - info->bits_used); | |
107 | printf("%05f ", ((float)val + info->offset) * info->scale); | |
108 | } else { | |
109 | printf("%05f ", ((float)input + info->offset) * info->scale); | |
110 | } | |
111 | } | |
ff39a252 | 112 | |
ebe51125 | 113 | static void print4byte(uint32_t input, struct iio_channel_info *info) |
8e926134 HK |
114 | { |
115 | /* First swap if incorrect endian */ | |
116 | if (info->be) | |
117 | input = be32toh(input); | |
118 | else | |
119 | input = le32toh(input); | |
120 | ||
121 | /* | |
122 | * Shift before conversion to avoid sign extension | |
123 | * of left aligned data | |
124 | */ | |
125 | input >>= info->shift; | |
126 | input &= info->mask; | |
127 | if (info->is_signed) { | |
128 | int32_t val = (int32_t)(input << (32 - info->bits_used)) >> | |
129 | (32 - info->bits_used); | |
130 | printf("%05f ", ((float)val + info->offset) * info->scale); | |
52615d47 | 131 | } else { |
8e926134 HK |
132 | printf("%05f ", ((float)input + info->offset) * info->scale); |
133 | } | |
134 | } | |
ff39a252 | 135 | |
ebe51125 | 136 | static void print8byte(uint64_t input, struct iio_channel_info *info) |
8e926134 HK |
137 | { |
138 | /* First swap if incorrect endian */ | |
139 | if (info->be) | |
140 | input = be64toh(input); | |
141 | else | |
142 | input = le64toh(input); | |
143 | ||
144 | /* | |
145 | * Shift before conversion to avoid sign extension | |
146 | * of left aligned data | |
147 | */ | |
148 | input >>= info->shift; | |
149 | input &= info->mask; | |
150 | if (info->is_signed) { | |
151 | int64_t val = (int64_t)(input << (64 - info->bits_used)) >> | |
152 | (64 - info->bits_used); | |
153 | /* special case for timestamp */ | |
154 | if (info->scale == 1.0f && info->offset == 0.0f) | |
155 | printf("%" PRId64 " ", val); | |
156 | else | |
157 | printf("%05f ", | |
158 | ((float)val + info->offset) * info->scale); | |
159 | } else { | |
160 | printf("%05f ", ((float)input + info->offset) * info->scale); | |
52615d47 JC |
161 | } |
162 | } | |
8e926134 | 163 | |
e58537cc JC |
164 | /** |
165 | * process_scan() - print out the values in SI units | |
166 | * @data: pointer to the start of the scan | |
7663a4aa HK |
167 | * @channels: information about the channels. |
168 | * Note: size_from_channelarray must have been called first | |
169 | * to fill the location offsets. | |
d8da0eee | 170 | * @num_channels: number of channels |
e58537cc | 171 | **/ |
ebe51125 AA |
172 | static void process_scan(char *data, struct iio_channel_info *channels, |
173 | int num_channels) | |
e58537cc JC |
174 | { |
175 | int k; | |
ff39a252 | 176 | |
e58537cc | 177 | for (k = 0; k < num_channels; k++) |
d8da0eee | 178 | switch (channels[k].bytes) { |
e58537cc | 179 | /* only a few cases implemented so far */ |
e8d0927a TB |
180 | case 1: |
181 | print1byte(*(uint8_t *)(data + channels[k].location), | |
182 | &channels[k]); | |
183 | break; | |
e58537cc | 184 | case 2: |
d8da0eee PM |
185 | print2byte(*(uint16_t *)(data + channels[k].location), |
186 | &channels[k]); | |
e58537cc | 187 | break; |
6cffc1f8 | 188 | case 4: |
8e926134 HK |
189 | print4byte(*(uint32_t *)(data + channels[k].location), |
190 | &channels[k]); | |
6cffc1f8 | 191 | break; |
e58537cc | 192 | case 8: |
8e926134 HK |
193 | print8byte(*(uint64_t *)(data + channels[k].location), |
194 | &channels[k]); | |
e58537cc JC |
195 | break; |
196 | default: | |
197 | break; | |
198 | } | |
199 | printf("\n"); | |
200 | } | |
201 | ||
8827faab | 202 | static int enable_disable_all_channels(char *dev_dir_name, int buffer_idx, int enable) |
5f991a92 LW |
203 | { |
204 | const struct dirent *ent; | |
205 | char scanelemdir[256]; | |
206 | DIR *dp; | |
207 | int ret; | |
208 | ||
209 | snprintf(scanelemdir, sizeof(scanelemdir), | |
8827faab | 210 | FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name, buffer_idx); |
5f991a92 LW |
211 | scanelemdir[sizeof(scanelemdir)-1] = '\0'; |
212 | ||
213 | dp = opendir(scanelemdir); | |
214 | if (!dp) { | |
215 | fprintf(stderr, "Enabling/disabling channels: can't open %s\n", | |
216 | scanelemdir); | |
217 | return -EIO; | |
218 | } | |
219 | ||
220 | ret = -ENOENT; | |
221 | while (ent = readdir(dp), ent) { | |
222 | if (iioutils_check_suffix(ent->d_name, "_en")) { | |
223 | printf("%sabling: %s\n", | |
224 | enable ? "En" : "Dis", | |
225 | ent->d_name); | |
226 | ret = write_sysfs_int(ent->d_name, scanelemdir, | |
227 | enable); | |
228 | if (ret < 0) | |
229 | fprintf(stderr, "Failed to enable/disable %s\n", | |
230 | ent->d_name); | |
231 | } | |
232 | } | |
233 | ||
234 | if (closedir(dp) == -1) { | |
235 | perror("Enabling/disabling channels: " | |
236 | "Failed to close directory"); | |
237 | return -errno; | |
238 | } | |
239 | return 0; | |
240 | } | |
241 | ||
ebe51125 | 242 | static void print_usage(void) |
e06e3d71 | 243 | { |
d9abc615 CO |
244 | fprintf(stderr, "Usage: generic_buffer [options]...\n" |
245 | "Capture, convert and output data from IIO device buffer\n" | |
5f991a92 | 246 | " -a Auto-activate all available channels\n" |
4e2cf0e2 | 247 | " -A Force-activate ALL channels\n" |
8827faab | 248 | " -b <n> The buffer which to open (by index), default 0\n" |
55dda0ab | 249 | " -c <n> Do n conversions, or loop forever if n < 0\n" |
d9abc615 CO |
250 | " -e Disable wait for event (new data)\n" |
251 | " -g Use trigger-less mode\n" | |
252 | " -l <n> Set buffer length to n samples\n" | |
de397db8 CDL |
253 | " --device-name -n <name>\n" |
254 | " --device-num -N <num>\n" | |
255 | " Set device by name or number (mandatory)\n" | |
7c7e9dad CDL |
256 | " --trigger-name -t <name>\n" |
257 | " --trigger-num -T <num>\n" | |
258 | " Set trigger by name or number\n" | |
d9abc615 | 259 | " -w <n> Set delay between reads in us (event-less mode)\n"); |
e06e3d71 HK |
260 | } |
261 | ||
ebe51125 AA |
262 | static enum autochan autochannels = AUTOCHANNELS_DISABLED; |
263 | static char *dev_dir_name = NULL; | |
264 | static char *buf_dir_name = NULL; | |
8827faab | 265 | static int buffer_idx = 0; |
ebe51125 | 266 | static bool current_trigger_set = false; |
4f20d592 | 267 | |
ebe51125 | 268 | static void cleanup(void) |
4f20d592 CDL |
269 | { |
270 | int ret; | |
271 | ||
272 | /* Disable trigger */ | |
273 | if (dev_dir_name && current_trigger_set) { | |
274 | /* Disconnect the trigger - just write a dummy name. */ | |
275 | ret = write_sysfs_string("trigger/current_trigger", | |
276 | dev_dir_name, "NULL"); | |
277 | if (ret < 0) | |
278 | fprintf(stderr, "Failed to disable trigger: %s\n", | |
279 | strerror(-ret)); | |
280 | current_trigger_set = false; | |
281 | } | |
282 | ||
283 | /* Disable buffer */ | |
284 | if (buf_dir_name) { | |
285 | ret = write_sysfs_int("enable", buf_dir_name, 0); | |
286 | if (ret < 0) | |
287 | fprintf(stderr, "Failed to disable buffer: %s\n", | |
288 | strerror(-ret)); | |
289 | } | |
290 | ||
291 | /* Disable channels if auto-enabled */ | |
292 | if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) { | |
8827faab | 293 | ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 0); |
4f20d592 CDL |
294 | if (ret) |
295 | fprintf(stderr, "Failed to disable all channels\n"); | |
296 | autochannels = AUTOCHANNELS_DISABLED; | |
297 | } | |
298 | } | |
299 | ||
ebe51125 | 300 | static void sig_handler(int signum) |
4f20d592 CDL |
301 | { |
302 | fprintf(stderr, "Caught signal %d\n", signum); | |
303 | cleanup(); | |
304 | exit(-signum); | |
305 | } | |
306 | ||
ebe51125 | 307 | static void register_cleanup(void) |
4f20d592 CDL |
308 | { |
309 | struct sigaction sa = { .sa_handler = sig_handler }; | |
310 | const int signums[] = { SIGINT, SIGTERM, SIGABRT }; | |
311 | int ret, i; | |
312 | ||
313 | for (i = 0; i < ARRAY_SIZE(signums); ++i) { | |
314 | ret = sigaction(signums[i], &sa, NULL); | |
315 | if (ret) { | |
316 | perror("Failed to register signal handler"); | |
317 | exit(-1); | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
de397db8 CDL |
322 | static const struct option longopts[] = { |
323 | { "device-name", 1, 0, 'n' }, | |
324 | { "device-num", 1, 0, 'N' }, | |
7c7e9dad CDL |
325 | { "trigger-name", 1, 0, 't' }, |
326 | { "trigger-num", 1, 0, 'T' }, | |
de397db8 CDL |
327 | { }, |
328 | }; | |
329 | ||
e58537cc JC |
330 | int main(int argc, char **argv) |
331 | { | |
b119d3bc | 332 | long long num_loops = 2; |
96df9799 JC |
333 | unsigned long timedelay = 1000000; |
334 | unsigned long buf_len = 128; | |
335 | ||
71b52d2c | 336 | ssize_t i; |
55dda0ab | 337 | unsigned long long j; |
71b52d2c MK |
338 | unsigned long toread; |
339 | int ret, c; | |
8827faab AA |
340 | struct stat st; |
341 | int fd = -1; | |
342 | int buf_fd = -1; | |
e58537cc | 343 | |
4f20d592 | 344 | int num_channels = 0; |
e58537cc | 345 | char *trigger_name = NULL, *device_name = NULL; |
e58537cc | 346 | |
4f20d592 | 347 | char *data = NULL; |
c77b3810 | 348 | ssize_t read_size; |
deb4d1fd | 349 | int dev_num = -1, trig_num = -1; |
4f20d592 | 350 | char *buffer_access = NULL; |
e58537cc | 351 | int scan_size; |
30268a3d | 352 | int noevents = 0; |
b6d5be57 | 353 | int notrigger = 0; |
96df9799 | 354 | char *dummy; |
71ccbe5d | 355 | bool force_autochannels = false; |
e58537cc | 356 | |
ddbc719f | 357 | struct iio_channel_info *channels = NULL; |
e58537cc | 358 | |
4f20d592 CDL |
359 | register_cleanup(); |
360 | ||
8827faab | 361 | while ((c = getopt_long(argc, argv, "aAb:c:egl:n:N:t:T:w:?", longopts, |
4e2cf0e2 | 362 | NULL)) != -1) { |
e58537cc | 363 | switch (c) { |
5f991a92 LW |
364 | case 'a': |
365 | autochannels = AUTOCHANNELS_ENABLED; | |
366 | break; | |
4e2cf0e2 ERR |
367 | case 'A': |
368 | autochannels = AUTOCHANNELS_ENABLED; | |
71ccbe5d | 369 | force_autochannels = true; |
8827faab AA |
370 | break; |
371 | case 'b': | |
372 | errno = 0; | |
373 | buffer_idx = strtoll(optarg, &dummy, 10); | |
374 | if (errno) { | |
375 | ret = -errno; | |
376 | goto error; | |
377 | } | |
378 | if (buffer_idx < 0) { | |
379 | ret = -ERANGE; | |
380 | goto error; | |
381 | } | |
382 | ||
383 | break; | |
96df9799 | 384 | case 'c': |
c8ce9903 | 385 | errno = 0; |
55dda0ab | 386 | num_loops = strtoll(optarg, &dummy, 10); |
4f20d592 CDL |
387 | if (errno) { |
388 | ret = -errno; | |
389 | goto error; | |
390 | } | |
7663a4aa | 391 | |
96df9799 | 392 | break; |
e06e3d71 HK |
393 | case 'e': |
394 | noevents = 1; | |
395 | break; | |
396 | case 'g': | |
397 | notrigger = 1; | |
96df9799 JC |
398 | break; |
399 | case 'l': | |
c8ce9903 | 400 | errno = 0; |
96df9799 | 401 | buf_len = strtoul(optarg, &dummy, 10); |
4f20d592 CDL |
402 | if (errno) { |
403 | ret = -errno; | |
404 | goto error; | |
405 | } | |
7663a4aa | 406 | |
96df9799 | 407 | break; |
e06e3d71 | 408 | case 'n': |
de397db8 CDL |
409 | device_name = strdup(optarg); |
410 | break; | |
411 | case 'N': | |
412 | errno = 0; | |
413 | dev_num = strtoul(optarg, &dummy, 10); | |
414 | if (errno) { | |
415 | ret = -errno; | |
416 | goto error; | |
417 | } | |
e06e3d71 HK |
418 | break; |
419 | case 't': | |
4f20d592 | 420 | trigger_name = strdup(optarg); |
e06e3d71 | 421 | break; |
7c7e9dad CDL |
422 | case 'T': |
423 | errno = 0; | |
424 | trig_num = strtoul(optarg, &dummy, 10); | |
425 | if (errno) | |
426 | return -errno; | |
427 | break; | |
e06e3d71 HK |
428 | case 'w': |
429 | errno = 0; | |
430 | timedelay = strtoul(optarg, &dummy, 10); | |
4f20d592 CDL |
431 | if (errno) { |
432 | ret = -errno; | |
433 | goto error; | |
434 | } | |
b6d5be57 | 435 | break; |
e58537cc | 436 | case '?': |
e06e3d71 | 437 | print_usage(); |
4f20d592 CDL |
438 | ret = -1; |
439 | goto error; | |
e58537cc JC |
440 | } |
441 | } | |
442 | ||
443 | /* Find the device requested */ | |
de397db8 CDL |
444 | if (dev_num < 0 && !device_name) { |
445 | fprintf(stderr, "Device not set\n"); | |
446 | print_usage(); | |
447 | ret = -1; | |
448 | goto error; | |
449 | } else if (dev_num >= 0 && device_name) { | |
450 | fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n"); | |
451 | print_usage(); | |
452 | ret = -1; | |
4f20d592 | 453 | goto error; |
de397db8 CDL |
454 | } else if (dev_num < 0) { |
455 | dev_num = find_type_by_name(device_name, "iio:device"); | |
456 | if (dev_num < 0) { | |
457 | fprintf(stderr, "Failed to find the %s\n", device_name); | |
458 | ret = dev_num; | |
459 | goto error; | |
460 | } | |
e58537cc JC |
461 | } |
462 | printf("iio device number being used is %d\n", dev_num); | |
463 | ||
e9e45b43 | 464 | ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); |
de397db8 CDL |
465 | if (ret < 0) |
466 | return -ENOMEM; | |
467 | /* Fetch device_name if specified by number */ | |
468 | if (!device_name) { | |
469 | device_name = malloc(IIO_MAX_NAME_LENGTH); | |
470 | if (!device_name) { | |
471 | ret = -ENOMEM; | |
472 | goto error; | |
473 | } | |
474 | ret = read_sysfs_string("name", dev_dir_name, device_name); | |
475 | if (ret < 0) { | |
476 | fprintf(stderr, "Failed to read name of device %d\n", dev_num); | |
477 | goto error; | |
478 | } | |
4f20d592 | 479 | } |
b6d5be57 | 480 | |
7c7e9dad CDL |
481 | if (notrigger) { |
482 | printf("trigger-less mode selected\n"); | |
f8e81d7e | 483 | } else if (trig_num >= 0) { |
7c7e9dad CDL |
484 | char *trig_dev_name; |
485 | ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num); | |
486 | if (ret < 0) { | |
487 | return -ENOMEM; | |
488 | } | |
489 | trigger_name = malloc(IIO_MAX_NAME_LENGTH); | |
490 | ret = read_sysfs_string("name", trig_dev_name, trigger_name); | |
491 | free(trig_dev_name); | |
492 | if (ret < 0) { | |
493 | fprintf(stderr, "Failed to read trigger%d name from\n", trig_num); | |
494 | return ret; | |
495 | } | |
496 | printf("iio trigger number being used is %d\n", trig_num); | |
497 | } else { | |
ff1ac639 | 498 | if (!trigger_name) { |
b6d5be57 KW |
499 | /* |
500 | * Build the trigger name. If it is device associated | |
501 | * its name is <device_name>_dev[n] where n matches | |
502 | * the device number found above. | |
503 | */ | |
504 | ret = asprintf(&trigger_name, | |
505 | "%s-dev%d", device_name, dev_num); | |
506 | if (ret < 0) { | |
507 | ret = -ENOMEM; | |
4f20d592 | 508 | goto error; |
b6d5be57 | 509 | } |
e58537cc | 510 | } |
e58537cc | 511 | |
793d6b5e LW |
512 | /* Look for this "-devN" trigger */ |
513 | trig_num = find_type_by_name(trigger_name, "trigger"); | |
514 | if (trig_num < 0) { | |
515 | /* OK try the simpler "-trigger" suffix instead */ | |
516 | free(trigger_name); | |
517 | ret = asprintf(&trigger_name, | |
518 | "%s-trigger", device_name); | |
519 | if (ret < 0) { | |
520 | ret = -ENOMEM; | |
4f20d592 | 521 | goto error; |
793d6b5e LW |
522 | } |
523 | } | |
524 | ||
b6d5be57 KW |
525 | trig_num = find_type_by_name(trigger_name, "trigger"); |
526 | if (trig_num < 0) { | |
d9abc615 CO |
527 | fprintf(stderr, "Failed to find the trigger %s\n", |
528 | trigger_name); | |
e83a47cf | 529 | ret = trig_num; |
4f20d592 | 530 | goto error; |
b6d5be57 | 531 | } |
7663a4aa | 532 | |
b6d5be57 | 533 | printf("iio trigger number being used is %d\n", trig_num); |
7663a4aa | 534 | } |
e58537cc JC |
535 | |
536 | /* | |
537 | * Parse the files in scan_elements to identify what channels are | |
538 | * present | |
539 | */ | |
8827faab | 540 | ret = build_channel_array(dev_dir_name, buffer_idx, &channels, &num_channels); |
e58537cc | 541 | if (ret) { |
d9abc615 CO |
542 | fprintf(stderr, "Problem reading scan element information\n" |
543 | "diag %s\n", dev_dir_name); | |
4f20d592 | 544 | goto error; |
e58537cc | 545 | } |
7c5fe411 | 546 | if (num_channels && autochannels == AUTOCHANNELS_ENABLED && |
71ccbe5d | 547 | !force_autochannels) { |
5f991a92 LW |
548 | fprintf(stderr, "Auto-channels selected but some channels " |
549 | "are already activated in sysfs\n"); | |
550 | fprintf(stderr, "Proceeding without activating any channels\n"); | |
551 | } | |
552 | ||
4e2cf0e2 | 553 | if ((!num_channels && autochannels == AUTOCHANNELS_ENABLED) || |
7c5fe411 | 554 | (autochannels == AUTOCHANNELS_ENABLED && force_autochannels)) { |
4e2cf0e2 | 555 | fprintf(stderr, "Enabling all channels\n"); |
5f991a92 | 556 | |
8827faab | 557 | ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 1); |
5f991a92 LW |
558 | if (ret) { |
559 | fprintf(stderr, "Failed to enable all channels\n"); | |
4f20d592 | 560 | goto error; |
5f991a92 LW |
561 | } |
562 | ||
563 | /* This flags that we need to disable the channels again */ | |
564 | autochannels = AUTOCHANNELS_ACTIVE; | |
565 | ||
8827faab | 566 | ret = build_channel_array(dev_dir_name, buffer_idx, &channels, |
5f991a92 LW |
567 | &num_channels); |
568 | if (ret) { | |
569 | fprintf(stderr, "Problem reading scan element " | |
570 | "information\n" | |
571 | "diag %s\n", dev_dir_name); | |
4f20d592 | 572 | goto error; |
5f991a92 LW |
573 | } |
574 | if (!num_channels) { | |
575 | fprintf(stderr, "Still no channels after " | |
576 | "auto-enabling, giving up\n"); | |
4f20d592 | 577 | goto error; |
5f991a92 LW |
578 | } |
579 | } | |
580 | ||
581 | if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) { | |
53dabafe LW |
582 | fprintf(stderr, |
583 | "No channels are enabled, we have nothing to scan.\n"); | |
584 | fprintf(stderr, "Enable channels manually in " | |
585 | FORMAT_SCAN_ELEMENTS_DIR | |
5f991a92 | 586 | "/*_en or pass -a to autoenable channels and " |
8827faab | 587 | "try again.\n", dev_dir_name, buffer_idx); |
53dabafe | 588 | ret = -ENOENT; |
4f20d592 | 589 | goto error; |
53dabafe | 590 | } |
e58537cc JC |
591 | |
592 | /* | |
593 | * Construct the directory name for the associated buffer. | |
594 | * As we know that the lis3l02dq has only one buffer this may | |
595 | * be built rather than found. | |
596 | */ | |
1aa04278 | 597 | ret = asprintf(&buf_dir_name, |
8827faab | 598 | "%siio:device%d/buffer%d", iio_dir, dev_num, buffer_idx); |
e58537cc JC |
599 | if (ret < 0) { |
600 | ret = -ENOMEM; | |
4f20d592 | 601 | goto error; |
e58537cc | 602 | } |
b6d5be57 | 603 | |
8827faab AA |
604 | if (stat(buf_dir_name, &st)) { |
605 | fprintf(stderr, "Could not stat() '%s', got error %d: %s\n", | |
606 | buf_dir_name, errno, strerror(errno)); | |
607 | ret = -errno; | |
608 | goto error; | |
609 | } | |
610 | ||
611 | if (!S_ISDIR(st.st_mode)) { | |
612 | fprintf(stderr, "File '%s' is not a directory\n", buf_dir_name); | |
613 | ret = -EFAULT; | |
614 | goto error; | |
615 | } | |
616 | ||
b6d5be57 KW |
617 | if (!notrigger) { |
618 | printf("%s %s\n", dev_dir_name, trigger_name); | |
7663a4aa HK |
619 | /* |
620 | * Set the device trigger to be the data ready trigger found | |
621 | * above | |
622 | */ | |
b6d5be57 KW |
623 | ret = write_sysfs_string_and_verify("trigger/current_trigger", |
624 | dev_dir_name, | |
625 | trigger_name); | |
626 | if (ret < 0) { | |
d9abc615 CO |
627 | fprintf(stderr, |
628 | "Failed to write current_trigger file\n"); | |
4f20d592 | 629 | goto error; |
b6d5be57 | 630 | } |
e58537cc JC |
631 | } |
632 | ||
8827faab AA |
633 | ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num); |
634 | if (ret < 0) { | |
635 | ret = -ENOMEM; | |
636 | goto error; | |
637 | } | |
638 | ||
639 | /* Attempt to open non blocking the access dev */ | |
640 | fd = open(buffer_access, O_RDONLY | O_NONBLOCK); | |
641 | if (fd == -1) { /* TODO: If it isn't there make the node */ | |
642 | ret = -errno; | |
643 | fprintf(stderr, "Failed to open %s\n", buffer_access); | |
644 | goto error; | |
645 | } | |
646 | ||
647 | /* specify for which buffer index we want an FD */ | |
648 | buf_fd = buffer_idx; | |
649 | ||
650 | ret = ioctl(fd, IIO_BUFFER_GET_FD_IOCTL, &buf_fd); | |
651 | if (ret == -1 || buf_fd == -1) { | |
652 | ret = -errno; | |
653 | if (ret == -ENODEV || ret == -EINVAL) | |
654 | fprintf(stderr, | |
655 | "Device does not have this many buffers\n"); | |
656 | else | |
657 | fprintf(stderr, "Failed to retrieve buffer fd\n"); | |
658 | ||
659 | goto error; | |
660 | } | |
661 | ||
e58537cc JC |
662 | /* Setup ring buffer parameters */ |
663 | ret = write_sysfs_int("length", buf_dir_name, buf_len); | |
664 | if (ret < 0) | |
4f20d592 | 665 | goto error; |
e58537cc JC |
666 | |
667 | /* Enable the buffer */ | |
668 | ret = write_sysfs_int("enable", buf_dir_name, 1); | |
e7231491 IT |
669 | if (ret < 0) { |
670 | fprintf(stderr, | |
8827faab AA |
671 | "Failed to enable buffer '%s': %s\n", |
672 | buf_dir_name, strerror(-ret)); | |
4f20d592 | 673 | goto error; |
e7231491 | 674 | } |
7663a4aa | 675 | |
d8da0eee | 676 | scan_size = size_from_channelarray(channels, num_channels); |
7663a4aa | 677 | data = malloc(scan_size * buf_len); |
e58537cc JC |
678 | if (!data) { |
679 | ret = -ENOMEM; | |
4f20d592 | 680 | goto error; |
e58537cc JC |
681 | } |
682 | ||
8827faab AA |
683 | /** |
684 | * This check is being done here for sanity reasons, however it | |
685 | * should be omitted under normal operation. | |
686 | * If this is buffer0, we check that we get EBUSY after this point. | |
687 | */ | |
688 | if (buffer_idx == 0) { | |
689 | errno = 0; | |
690 | read_size = read(fd, data, 1); | |
691 | if (read_size > -1 || errno != EBUSY) { | |
692 | ret = -EFAULT; | |
693 | perror("Reading from '%s' should not be possible after ioctl()"); | |
694 | goto error; | |
695 | } | |
e58537cc JC |
696 | } |
697 | ||
8827faab AA |
698 | /* close now the main chardev FD and let the buffer FD work */ |
699 | if (close(fd) == -1) | |
700 | perror("Failed to close character device file"); | |
701 | fd = -1; | |
e58537cc | 702 | |
55dda0ab | 703 | for (j = 0; j < num_loops || num_loops < 0; j++) { |
30268a3d | 704 | if (!noevents) { |
52615d47 | 705 | struct pollfd pfd = { |
8827faab | 706 | .fd = buf_fd, |
52615d47 JC |
707 | .events = POLLIN, |
708 | }; | |
709 | ||
6bb7cac8 HK |
710 | ret = poll(&pfd, 1, -1); |
711 | if (ret < 0) { | |
712 | ret = -errno; | |
4f20d592 | 713 | goto error; |
6bb7cac8 HK |
714 | } else if (ret == 0) { |
715 | continue; | |
716 | } | |
717 | ||
30268a3d | 718 | } else { |
96df9799 | 719 | usleep(timedelay); |
e58537cc | 720 | } |
30268a3d | 721 | |
7c919b61 MV |
722 | toread = buf_len; |
723 | ||
8827faab | 724 | read_size = read(buf_fd, data, toread * scan_size); |
97b603a4 | 725 | if (read_size < 0) { |
8749948a | 726 | if (errno == EAGAIN) { |
d9abc615 | 727 | fprintf(stderr, "nothing available\n"); |
97b603a4 | 728 | continue; |
7663a4aa | 729 | } else { |
97b603a4 | 730 | break; |
7663a4aa | 731 | } |
e58537cc | 732 | } |
7663a4aa HK |
733 | for (i = 0; i < read_size / scan_size; i++) |
734 | process_scan(data + scan_size * i, channels, | |
e58537cc JC |
735 | num_channels); |
736 | } | |
737 | ||
4f20d592 CDL |
738 | error: |
739 | cleanup(); | |
e58537cc | 740 | |
8827faab AA |
741 | if (fd >= 0 && close(fd) == -1) |
742 | perror("Failed to close character device"); | |
743 | if (buf_fd >= 0 && close(buf_fd) == -1) | |
6bb7cac8 | 744 | perror("Failed to close buffer"); |
e58537cc | 745 | free(buffer_access); |
a71bfb4a | 746 | free(data); |
e58537cc | 747 | free(buf_dir_name); |
63f05c85 HK |
748 | for (i = num_channels - 1; i >= 0; i--) { |
749 | free(channels[i].name); | |
750 | free(channels[i].generic_name); | |
751 | } | |
752 | free(channels); | |
4f20d592 | 753 | free(trigger_name); |
de397db8 | 754 | free(device_name); |
d3ccfc41 | 755 | free(dev_dir_name); |
0e799878 | 756 | |
e58537cc JC |
757 | return ret; |
758 | } |