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TOMOYO Linux Cross Reference
Linux/tools/iio/iio_generic_buffer.c

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

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