Commit | Line | Data |
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e58537cc JC |
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> | |
bdcb31d0 | 22 | #include <stdlib.h> |
e58537cc JC |
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> | |
30268a3d | 30 | #include <string.h> |
52615d47 | 31 | #include <poll.h> |
117cf8b7 | 32 | #include <endian.h> |
bb23378c | 33 | #include <getopt.h> |
1bcdfbcf | 34 | #include <inttypes.h> |
e58537cc JC |
35 | #include "iio_utils.h" |
36 | ||
e58537cc JC |
37 | /** |
38 | * size_from_channelarray() - calculate the storage size of a scan | |
d8da0eee PM |
39 | * @channels: the channel info array |
40 | * @num_channels: number of channels | |
e58537cc JC |
41 | * |
42 | * Has the side effect of filling the channels[i].location values used | |
43 | * in processing the buffer output. | |
44 | **/ | |
45 | int size_from_channelarray(struct iio_channel_info *channels, int num_channels) | |
46 | { | |
47 | int bytes = 0; | |
48 | int i = 0; | |
ff39a252 | 49 | |
e58537cc JC |
50 | while (i < num_channels) { |
51 | if (bytes % channels[i].bytes == 0) | |
52 | channels[i].location = bytes; | |
53 | else | |
54 | channels[i].location = bytes - bytes%channels[i].bytes | |
55 | + channels[i].bytes; | |
56 | bytes = channels[i].location + channels[i].bytes; | |
57 | i++; | |
58 | } | |
59 | return bytes; | |
60 | } | |
61 | ||
8e926134 | 62 | void print2byte(uint16_t input, struct iio_channel_info *info) |
52615d47 | 63 | { |
117cf8b7 | 64 | /* First swap if incorrect endian */ |
117cf8b7 | 65 | if (info->be) |
8e926134 | 66 | input = be16toh(input); |
117cf8b7 | 67 | else |
8e926134 | 68 | input = le16toh(input); |
117cf8b7 | 69 | |
d8da0eee PM |
70 | /* |
71 | * Shift before conversion to avoid sign extension | |
72 | * of left aligned data | |
73 | */ | |
1525ecfc | 74 | input >>= info->shift; |
8e926134 | 75 | input &= info->mask; |
52615d47 | 76 | if (info->is_signed) { |
8e926134 HK |
77 | int16_t val = (int16_t)(input << (16 - info->bits_used)) >> |
78 | (16 - info->bits_used); | |
79 | printf("%05f ", ((float)val + info->offset) * info->scale); | |
80 | } else { | |
81 | printf("%05f ", ((float)input + info->offset) * info->scale); | |
82 | } | |
83 | } | |
ff39a252 | 84 | |
8e926134 HK |
85 | void print4byte(uint32_t input, struct iio_channel_info *info) |
86 | { | |
87 | /* First swap if incorrect endian */ | |
88 | if (info->be) | |
89 | input = be32toh(input); | |
90 | else | |
91 | input = le32toh(input); | |
92 | ||
93 | /* | |
94 | * Shift before conversion to avoid sign extension | |
95 | * of left aligned data | |
96 | */ | |
97 | input >>= info->shift; | |
98 | input &= info->mask; | |
99 | if (info->is_signed) { | |
100 | int32_t val = (int32_t)(input << (32 - info->bits_used)) >> | |
101 | (32 - info->bits_used); | |
102 | printf("%05f ", ((float)val + info->offset) * info->scale); | |
52615d47 | 103 | } else { |
8e926134 HK |
104 | printf("%05f ", ((float)input + info->offset) * info->scale); |
105 | } | |
106 | } | |
ff39a252 | 107 | |
8e926134 HK |
108 | void print8byte(uint64_t input, struct iio_channel_info *info) |
109 | { | |
110 | /* First swap if incorrect endian */ | |
111 | if (info->be) | |
112 | input = be64toh(input); | |
113 | else | |
114 | input = le64toh(input); | |
115 | ||
116 | /* | |
117 | * Shift before conversion to avoid sign extension | |
118 | * of left aligned data | |
119 | */ | |
120 | input >>= info->shift; | |
121 | input &= info->mask; | |
122 | if (info->is_signed) { | |
123 | int64_t val = (int64_t)(input << (64 - info->bits_used)) >> | |
124 | (64 - info->bits_used); | |
125 | /* special case for timestamp */ | |
126 | if (info->scale == 1.0f && info->offset == 0.0f) | |
127 | printf("%" PRId64 " ", val); | |
128 | else | |
129 | printf("%05f ", | |
130 | ((float)val + info->offset) * info->scale); | |
131 | } else { | |
132 | printf("%05f ", ((float)input + info->offset) * info->scale); | |
52615d47 JC |
133 | } |
134 | } | |
8e926134 | 135 | |
e58537cc JC |
136 | /** |
137 | * process_scan() - print out the values in SI units | |
138 | * @data: pointer to the start of the scan | |
d8da0eee | 139 | * @channels: information about the channels. Note |
e58537cc JC |
140 | * size_from_channelarray must have been called first to fill the |
141 | * location offsets. | |
d8da0eee | 142 | * @num_channels: number of channels |
e58537cc JC |
143 | **/ |
144 | void process_scan(char *data, | |
d8da0eee | 145 | struct iio_channel_info *channels, |
e58537cc JC |
146 | int num_channels) |
147 | { | |
148 | int k; | |
ff39a252 | 149 | |
e58537cc | 150 | for (k = 0; k < num_channels; k++) |
d8da0eee | 151 | switch (channels[k].bytes) { |
e58537cc JC |
152 | /* only a few cases implemented so far */ |
153 | case 2: | |
d8da0eee PM |
154 | print2byte(*(uint16_t *)(data + channels[k].location), |
155 | &channels[k]); | |
e58537cc | 156 | break; |
6cffc1f8 | 157 | case 4: |
8e926134 HK |
158 | print4byte(*(uint32_t *)(data + channels[k].location), |
159 | &channels[k]); | |
6cffc1f8 | 160 | break; |
e58537cc | 161 | case 8: |
8e926134 HK |
162 | print8byte(*(uint64_t *)(data + channels[k].location), |
163 | &channels[k]); | |
e58537cc JC |
164 | break; |
165 | default: | |
166 | break; | |
167 | } | |
168 | printf("\n"); | |
169 | } | |
170 | ||
171 | int main(int argc, char **argv) | |
172 | { | |
96df9799 JC |
173 | unsigned long num_loops = 2; |
174 | unsigned long timedelay = 1000000; | |
175 | unsigned long buf_len = 128; | |
176 | ||
e58537cc | 177 | int ret, c, i, j, toread; |
e58537cc JC |
178 | int fp; |
179 | ||
180 | int num_channels; | |
181 | char *trigger_name = NULL, *device_name = NULL; | |
182 | char *dev_dir_name, *buf_dir_name; | |
183 | ||
184 | int datardytrigger = 1; | |
185 | char *data; | |
c77b3810 | 186 | ssize_t read_size; |
e58537cc | 187 | int dev_num, trig_num; |
52615d47 | 188 | char *buffer_access; |
e58537cc | 189 | int scan_size; |
30268a3d | 190 | int noevents = 0; |
b6d5be57 | 191 | int notrigger = 0; |
96df9799 | 192 | char *dummy; |
e58537cc | 193 | |
d8da0eee | 194 | struct iio_channel_info *channels; |
e58537cc | 195 | |
b6d5be57 | 196 | while ((c = getopt(argc, argv, "l:w:c:et:n:g")) != -1) { |
e58537cc JC |
197 | switch (c) { |
198 | case 'n': | |
199 | device_name = optarg; | |
200 | break; | |
201 | case 't': | |
202 | trigger_name = optarg; | |
203 | datardytrigger = 0; | |
204 | break; | |
30268a3d JC |
205 | case 'e': |
206 | noevents = 1; | |
207 | break; | |
96df9799 | 208 | case 'c': |
c8ce9903 | 209 | errno = 0; |
96df9799 | 210 | num_loops = strtoul(optarg, &dummy, 10); |
c8ce9903 HK |
211 | if (errno) |
212 | return -errno; | |
96df9799 JC |
213 | break; |
214 | case 'w': | |
c8ce9903 | 215 | errno = 0; |
96df9799 | 216 | timedelay = strtoul(optarg, &dummy, 10); |
c8ce9903 HK |
217 | if (errno) |
218 | return -errno; | |
96df9799 JC |
219 | break; |
220 | case 'l': | |
c8ce9903 | 221 | errno = 0; |
96df9799 | 222 | buf_len = strtoul(optarg, &dummy, 10); |
c8ce9903 HK |
223 | if (errno) |
224 | return -errno; | |
96df9799 | 225 | break; |
b6d5be57 KW |
226 | case 'g': |
227 | notrigger = 1; | |
228 | break; | |
e58537cc JC |
229 | case '?': |
230 | return -1; | |
231 | } | |
232 | } | |
233 | ||
065896e9 MH |
234 | if (device_name == NULL) |
235 | return -1; | |
236 | ||
e58537cc | 237 | /* Find the device requested */ |
1aa04278 | 238 | dev_num = find_type_by_name(device_name, "iio:device"); |
e58537cc JC |
239 | if (dev_num < 0) { |
240 | printf("Failed to find the %s\n", device_name); | |
e83a47cf | 241 | ret = dev_num; |
e58537cc JC |
242 | goto error_ret; |
243 | } | |
244 | printf("iio device number being used is %d\n", dev_num); | |
245 | ||
e9e45b43 HK |
246 | ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); |
247 | if (ret < 0) | |
248 | return -ENOMEM; | |
b6d5be57 KW |
249 | |
250 | if (!notrigger) { | |
251 | if (trigger_name == NULL) { | |
252 | /* | |
253 | * Build the trigger name. If it is device associated | |
254 | * its name is <device_name>_dev[n] where n matches | |
255 | * the device number found above. | |
256 | */ | |
257 | ret = asprintf(&trigger_name, | |
258 | "%s-dev%d", device_name, dev_num); | |
259 | if (ret < 0) { | |
260 | ret = -ENOMEM; | |
d3ccfc41 | 261 | goto error_free_dev_dir_name; |
b6d5be57 | 262 | } |
e58537cc | 263 | } |
e58537cc | 264 | |
b6d5be57 KW |
265 | /* Verify the trigger exists */ |
266 | trig_num = find_type_by_name(trigger_name, "trigger"); | |
267 | if (trig_num < 0) { | |
268 | printf("Failed to find the trigger %s\n", trigger_name); | |
e83a47cf | 269 | ret = trig_num; |
b6d5be57 KW |
270 | goto error_free_triggername; |
271 | } | |
272 | printf("iio trigger number being used is %d\n", trig_num); | |
273 | } else | |
274 | printf("trigger-less mode selected\n"); | |
e58537cc JC |
275 | |
276 | /* | |
277 | * Parse the files in scan_elements to identify what channels are | |
278 | * present | |
279 | */ | |
d8da0eee | 280 | ret = build_channel_array(dev_dir_name, &channels, &num_channels); |
e58537cc | 281 | if (ret) { |
52615d47 | 282 | printf("Problem reading scan element information\n"); |
1aa04278 | 283 | printf("diag %s\n", dev_dir_name); |
e58537cc JC |
284 | goto error_free_triggername; |
285 | } | |
286 | ||
287 | /* | |
288 | * Construct the directory name for the associated buffer. | |
289 | * As we know that the lis3l02dq has only one buffer this may | |
290 | * be built rather than found. | |
291 | */ | |
1aa04278 JC |
292 | ret = asprintf(&buf_dir_name, |
293 | "%siio:device%d/buffer", iio_dir, dev_num); | |
e58537cc JC |
294 | if (ret < 0) { |
295 | ret = -ENOMEM; | |
63f05c85 | 296 | goto error_free_channels; |
e58537cc | 297 | } |
b6d5be57 KW |
298 | |
299 | if (!notrigger) { | |
300 | printf("%s %s\n", dev_dir_name, trigger_name); | |
301 | /* Set the device trigger to be the data ready trigger found | |
302 | * above */ | |
303 | ret = write_sysfs_string_and_verify("trigger/current_trigger", | |
304 | dev_dir_name, | |
305 | trigger_name); | |
306 | if (ret < 0) { | |
307 | printf("Failed to write current_trigger file\n"); | |
308 | goto error_free_buf_dir_name; | |
309 | } | |
e58537cc JC |
310 | } |
311 | ||
312 | /* Setup ring buffer parameters */ | |
313 | ret = write_sysfs_int("length", buf_dir_name, buf_len); | |
314 | if (ret < 0) | |
315 | goto error_free_buf_dir_name; | |
316 | ||
317 | /* Enable the buffer */ | |
318 | ret = write_sysfs_int("enable", buf_dir_name, 1); | |
319 | if (ret < 0) | |
320 | goto error_free_buf_dir_name; | |
d8da0eee | 321 | scan_size = size_from_channelarray(channels, num_channels); |
e58537cc JC |
322 | data = malloc(scan_size*buf_len); |
323 | if (!data) { | |
324 | ret = -ENOMEM; | |
325 | goto error_free_buf_dir_name; | |
326 | } | |
327 | ||
1aa04278 | 328 | ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num); |
e58537cc JC |
329 | if (ret < 0) { |
330 | ret = -ENOMEM; | |
331 | goto error_free_data; | |
332 | } | |
333 | ||
e58537cc JC |
334 | /* Attempt to open non blocking the access dev */ |
335 | fp = open(buffer_access, O_RDONLY | O_NONBLOCK); | |
d8da0eee | 336 | if (fp == -1) { /* If it isn't there make the node */ |
e58537cc | 337 | ret = -errno; |
2b6a6e67 | 338 | printf("Failed to open %s\n", buffer_access); |
52615d47 | 339 | goto error_free_buffer_access; |
e58537cc JC |
340 | } |
341 | ||
342 | /* Wait for events 10 times */ | |
343 | for (j = 0; j < num_loops; j++) { | |
30268a3d | 344 | if (!noevents) { |
52615d47 JC |
345 | struct pollfd pfd = { |
346 | .fd = fp, | |
347 | .events = POLLIN, | |
348 | }; | |
349 | ||
6bb7cac8 HK |
350 | ret = poll(&pfd, 1, -1); |
351 | if (ret < 0) { | |
352 | ret = -errno; | |
353 | goto error_close_buffer_access; | |
354 | } else if (ret == 0) { | |
355 | continue; | |
356 | } | |
357 | ||
52615d47 JC |
358 | toread = buf_len; |
359 | ||
30268a3d | 360 | } else { |
96df9799 | 361 | usleep(timedelay); |
30268a3d | 362 | toread = 64; |
e58537cc | 363 | } |
30268a3d | 364 | |
e58537cc JC |
365 | read_size = read(fp, |
366 | data, | |
367 | toread*scan_size); | |
97b603a4 | 368 | if (read_size < 0) { |
8749948a | 369 | if (errno == EAGAIN) { |
97b603a4 PM |
370 | printf("nothing available\n"); |
371 | continue; | |
372 | } else | |
373 | break; | |
e58537cc JC |
374 | } |
375 | for (i = 0; i < read_size/scan_size; i++) | |
376 | process_scan(data + scan_size*i, | |
d8da0eee | 377 | channels, |
e58537cc JC |
378 | num_channels); |
379 | } | |
380 | ||
d8da0eee | 381 | /* Stop the buffer */ |
e58537cc JC |
382 | ret = write_sysfs_int("enable", buf_dir_name, 0); |
383 | if (ret < 0) | |
52615d47 | 384 | goto error_close_buffer_access; |
e58537cc | 385 | |
b6d5be57 KW |
386 | if (!notrigger) |
387 | /* Disconnect the trigger - just write a dummy name. */ | |
6bb7cac8 HK |
388 | ret = write_sysfs_string("trigger/current_trigger", |
389 | dev_dir_name, "NULL"); | |
390 | if (ret < 0) | |
391 | printf("Failed to write to %s\n", dev_dir_name); | |
e58537cc | 392 | |
e58537cc | 393 | error_close_buffer_access: |
6bb7cac8 HK |
394 | if (close(fp) == -1) |
395 | perror("Failed to close buffer"); | |
e58537cc JC |
396 | error_free_buffer_access: |
397 | free(buffer_access); | |
a71bfb4a HK |
398 | error_free_data: |
399 | free(data); | |
e58537cc JC |
400 | error_free_buf_dir_name: |
401 | free(buf_dir_name); | |
63f05c85 HK |
402 | error_free_channels: |
403 | for (i = num_channels - 1; i >= 0; i--) { | |
404 | free(channels[i].name); | |
405 | free(channels[i].generic_name); | |
406 | } | |
407 | free(channels); | |
e58537cc JC |
408 | error_free_triggername: |
409 | if (datardytrigger) | |
410 | free(trigger_name); | |
d3ccfc41 HK |
411 | error_free_dev_dir_name: |
412 | free(dev_dir_name); | |
e58537cc JC |
413 | error_ret: |
414 | return ret; | |
415 | } |