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Commit | Line | Data |
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dfaee1de BG |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
6ec6c43b | 20 | #include <config.h> |
6b80b80d | 21 | #include <string.h> |
391e23a9 | 22 | #include <stdlib.h> |
6b80b80d | 23 | #include <errno.h> |
391e23a9 | 24 | #include <fcntl.h> |
61f2b7f7 | 25 | #include <glib/gstdio.h> |
dfaee1de | 26 | #include "protocol.h" |
740ad48a | 27 | #include "gpio.h" |
dfaee1de | 28 | |
133016f6 BG |
29 | enum channel_type { |
30 | ENRG_PWR = 1, | |
31 | ENRG_CURR, | |
32 | ENRG_VOL, | |
33 | TEMP_IN, | |
34 | TEMP_OUT, | |
35 | }; | |
36 | ||
6b80b80d BG |
37 | struct channel_group_priv { |
38 | int hwmon_num; | |
61f2b7f7 | 39 | int probe_type; |
740ad48a | 40 | int index; |
6b80b80d BG |
41 | }; |
42 | ||
43 | struct channel_priv { | |
44 | int ch_type; | |
4e88b86c | 45 | int fd; |
7e5a048f | 46 | float val; |
6b80b80d BG |
47 | struct channel_group_priv *probe; |
48 | }; | |
49 | ||
50 | static const uint8_t enrg_i2c_addrs[] = { | |
51 | 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47, | |
52 | }; | |
53 | ||
54 | static const uint8_t temp_i2c_addrs[] = { | |
55 | 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b, | |
56 | }; | |
57 | ||
740ad48a | 58 | static const uint32_t pws_gpios[] = { |
391e23a9 | 59 | 486, 498, 502, 482, 478, 506, 510, 474, |
740ad48a BG |
60 | }; |
61 | ||
62 | static const uint32_t pws_info_gpios[] = { | |
63 | 487, 499, 503, 483, 479, 507, 511, 475, | |
64 | }; | |
65 | ||
61f2b7f7 BG |
66 | #define MOHM_TO_UOHM(x) ((x) * 1000) |
67 | #define UOHM_TO_MOHM(x) ((x) / 1000) | |
68 | ||
6b80b80d BG |
69 | SR_PRIV uint8_t bl_acme_get_enrg_addr(int index) |
70 | { | |
71 | return enrg_i2c_addrs[index]; | |
72 | } | |
73 | ||
74 | SR_PRIV uint8_t bl_acme_get_temp_addr(int index) | |
75 | { | |
76 | return temp_i2c_addrs[index]; | |
77 | } | |
78 | ||
79 | SR_PRIV gboolean bl_acme_is_sane(void) | |
80 | { | |
81 | gboolean status; | |
82 | ||
83 | /* | |
84 | * We expect sysfs to be present and mounted at /sys, ina226 and | |
85 | * tmp435 sensors detected by the system and their appropriate | |
86 | * drivers loaded and functional. | |
87 | */ | |
88 | status = g_file_test("/sys", G_FILE_TEST_IS_DIR); | |
89 | if (!status) { | |
90 | sr_err("/sys/ directory not found - sysfs not mounted?"); | |
91 | return FALSE; | |
92 | } | |
93 | ||
94 | return TRUE; | |
95 | } | |
96 | ||
97 | static void probe_name_path(unsigned int addr, GString *path) | |
98 | { | |
99 | g_string_printf(path, | |
100 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr); | |
101 | } | |
102 | ||
103 | /* | |
104 | * For given address fill buf with the path to appropriate hwmon entry. | |
105 | */ | |
106 | static void probe_hwmon_path(unsigned int addr, GString *path) | |
107 | { | |
108 | g_string_printf(path, | |
109 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr); | |
110 | } | |
111 | ||
112 | SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr, | |
113 | int prb_num, const char *prb_name) | |
114 | { | |
115 | gboolean ret = FALSE, status; | |
116 | char *buf = NULL; | |
117 | GString *path = g_string_sized_new(64); | |
118 | GError *err = NULL; | |
119 | gsize size; | |
120 | ||
121 | probe_name_path(addr, path); | |
122 | status = g_file_get_contents(path->str, &buf, &size, &err); | |
123 | if (!status) { | |
124 | sr_dbg("Name for probe %d can't be read: %s", | |
125 | prb_num, err->message); | |
126 | g_string_free(path, TRUE); | |
127 | return ret; | |
6b80b80d BG |
128 | } |
129 | ||
391e23a9 | 130 | if (!strncmp(buf, prb_name, strlen(prb_name))) { |
6b80b80d BG |
131 | /* |
132 | * Correct driver registered on this address - but is | |
133 | * there an actual probe connected? | |
134 | */ | |
135 | probe_hwmon_path(addr, path); | |
136 | status = g_file_test(path->str, G_FILE_TEST_IS_DIR); | |
137 | if (status) { | |
138 | /* We have found an ACME probe. */ | |
139 | ret = TRUE; | |
140 | } | |
141 | } | |
142 | ||
143 | g_free(buf); | |
144 | g_string_free(path, TRUE); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int get_hwmon_index(unsigned int addr) | |
150 | { | |
151 | int status, hwmon; | |
152 | GString *path = g_string_sized_new(64); | |
153 | GError *err = NULL; | |
154 | GDir *dir; | |
155 | ||
156 | probe_hwmon_path(addr, path); | |
157 | dir = g_dir_open(path->str, 0, &err); | |
391e23a9 | 158 | if (!dir) { |
6b80b80d BG |
159 | sr_err("Error opening %s: %s", path->str, err->message); |
160 | g_string_free(path, TRUE); | |
161 | return -1; | |
162 | } | |
163 | ||
164 | g_string_free(path, TRUE); | |
165 | ||
166 | /* | |
167 | * The directory should contain a single file named hwmonX where X | |
168 | * is the hwmon index. | |
169 | */ | |
170 | status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon); | |
171 | g_dir_close(dir); | |
172 | if (status != 1) { | |
173 | sr_err("Unable to determine the hwmon entry"); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | return hwmon; | |
178 | } | |
179 | ||
391e23a9 | 180 | static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg, |
6b80b80d BG |
181 | int index, int type) |
182 | { | |
183 | struct channel_priv *cp; | |
184 | struct dev_context *devc; | |
185 | struct sr_channel *ch; | |
186 | char *name; | |
187 | ||
188 | devc = sdi->priv; | |
189 | ||
190 | switch (type) { | |
191 | case ENRG_PWR: | |
192 | name = g_strdup_printf("P%d_ENRG_PWR", index); | |
193 | break; | |
194 | case ENRG_CURR: | |
195 | name = g_strdup_printf("P%d_ENRG_CURR", index); | |
196 | break; | |
197 | case ENRG_VOL: | |
198 | name = g_strdup_printf("P%d_ENRG_VOL", index); | |
199 | break; | |
200 | case TEMP_IN: | |
201 | name = g_strdup_printf("P%d_TEMP_IN", index); | |
202 | break; | |
203 | case TEMP_OUT: | |
204 | name = g_strdup_printf("P%d_TEMP_OUT", index); | |
205 | break; | |
206 | default: | |
391e23a9 | 207 | sr_err("Invalid channel type: %d.", type); |
6b80b80d BG |
208 | return; |
209 | } | |
210 | ||
211 | cp = g_malloc0(sizeof(struct channel_priv)); | |
212 | cp->ch_type = type; | |
213 | cp->probe = cg->priv; | |
214 | ||
5e23fcab | 215 | ch = sr_channel_new(sdi, devc->num_channels++, |
6b80b80d BG |
216 | SR_CHANNEL_ANALOG, TRUE, name); |
217 | g_free(name); | |
218 | ||
219 | ch->priv = cp; | |
220 | cg->channels = g_slist_append(cg->channels, ch); | |
6b80b80d BG |
221 | } |
222 | ||
223 | SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type, | |
224 | unsigned int addr, int prb_num) | |
225 | { | |
226 | struct sr_channel_group *cg; | |
227 | struct channel_group_priv *cgp; | |
228 | int hwmon; | |
229 | ||
230 | /* Obtain the hwmon index. */ | |
231 | hwmon = get_hwmon_index(addr); | |
232 | if (hwmon < 0) | |
233 | return FALSE; | |
234 | ||
235 | cg = g_malloc0(sizeof(struct sr_channel_group)); | |
236 | cgp = g_malloc0(sizeof(struct channel_group_priv)); | |
237 | cgp->hwmon_num = hwmon; | |
61f2b7f7 | 238 | cgp->probe_type = type; |
740ad48a | 239 | cgp->index = prb_num - 1; |
6b80b80d BG |
240 | cg->name = g_strdup_printf("Probe_%d", prb_num); |
241 | cg->priv = cgp; | |
242 | ||
243 | if (type == PROBE_ENRG) { | |
244 | append_channel(sdi, cg, prb_num, ENRG_PWR); | |
245 | append_channel(sdi, cg, prb_num, ENRG_CURR); | |
246 | append_channel(sdi, cg, prb_num, ENRG_VOL); | |
247 | } else if (type == PROBE_TEMP) { | |
248 | append_channel(sdi, cg, prb_num, TEMP_IN); | |
249 | append_channel(sdi, cg, prb_num, TEMP_OUT); | |
250 | } else { | |
391e23a9 | 251 | sr_err("Invalid probe type: %d.", type); |
6b80b80d BG |
252 | } |
253 | ||
254 | sdi->channel_groups = g_slist_append(sdi->channel_groups, cg); | |
255 | ||
256 | return TRUE; | |
257 | } | |
258 | ||
1fe04eb8 BG |
259 | SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg) |
260 | { | |
261 | struct channel_group_priv *cgp = cg->priv; | |
262 | ||
263 | return cgp->probe_type; | |
264 | } | |
265 | ||
266 | SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg) | |
267 | { | |
268 | struct channel_group_priv *cgp = cg->priv; | |
269 | ||
270 | return sr_gpio_getval_export(pws_info_gpios[cgp->index]); | |
271 | } | |
272 | ||
61f2b7f7 BG |
273 | /* |
274 | * Sets path to the hwmon attribute if this channel group | |
275 | * supports shunt resistance setting. The caller has to supply | |
276 | * a valid GString. | |
277 | */ | |
278 | static int get_shunt_path(const struct sr_channel_group *cg, GString *path) | |
279 | { | |
280 | struct channel_group_priv *cgp; | |
281 | int ret = SR_OK, status; | |
282 | ||
283 | cgp = cg->priv; | |
284 | ||
285 | if (cgp->probe_type != PROBE_ENRG) { | |
286 | sr_err("Probe doesn't support shunt resistance setting"); | |
287 | return SR_ERR_ARG; | |
288 | } | |
289 | ||
290 | g_string_append_printf(path, | |
291 | "/sys/class/hwmon/hwmon%d/shunt_resistor", | |
292 | cgp->hwmon_num); | |
293 | ||
294 | /* | |
295 | * The shunt_resistor sysfs attribute is available | |
296 | * in the Linux kernel since version 3.20. We have | |
391e23a9 | 297 | * to notify the user if this attribute is not present. |
61f2b7f7 BG |
298 | */ |
299 | status = g_file_test(path->str, G_FILE_TEST_EXISTS); | |
300 | if (!status) { | |
391e23a9 | 301 | sr_err("shunt_resistance attribute not present, please update " |
61f2b7f7 BG |
302 | "your kernel to version >=3.20"); |
303 | return SR_ERR_NA; | |
304 | } | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
7c91c22a BG |
309 | /* |
310 | * Try setting the update_interval sysfs attribute for each probe according | |
311 | * to samplerate. | |
312 | */ | |
313 | SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi, | |
314 | uint64_t samplerate) | |
315 | { | |
316 | struct sr_channel_group *cg; | |
317 | struct channel_group_priv *cgp; | |
318 | GString *hwmon; | |
319 | GSList *l; | |
320 | FILE *fd; | |
321 | ||
322 | for (l = sdi->channel_groups; l != NULL; l = l->next) { | |
323 | cg = l->data; | |
324 | cgp = cg->priv; | |
325 | ||
326 | hwmon = g_string_sized_new(64); | |
327 | g_string_append_printf(hwmon, | |
328 | "/sys/class/hwmon/hwmon%d/update_interval", | |
329 | cgp->hwmon_num); | |
330 | ||
331 | if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) { | |
332 | fd = g_fopen(hwmon->str, "w"); | |
333 | if (!fd) { | |
334 | g_string_free(hwmon, TRUE); | |
335 | continue; | |
336 | } | |
337 | ||
338 | g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate); | |
339 | fclose(fd); | |
340 | } | |
341 | ||
342 | g_string_free(hwmon, TRUE); | |
343 | } | |
344 | } | |
345 | ||
61f2b7f7 BG |
346 | SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg, |
347 | uint64_t *shunt) | |
348 | { | |
349 | GString *path = g_string_sized_new(64); | |
350 | gchar *contents; | |
351 | int status, ret = SR_OK; | |
352 | GError *err = NULL; | |
353 | ||
354 | status = get_shunt_path(cg, path); | |
355 | if (status != SR_OK) { | |
356 | ret = status; | |
357 | goto out; | |
358 | } | |
359 | ||
360 | status = g_file_get_contents(path->str, &contents, NULL, &err); | |
361 | if (!status) { | |
362 | sr_err("Error reading shunt resistance: %s", err->message); | |
363 | ret = SR_ERR_IO; | |
364 | goto out; | |
365 | } | |
366 | ||
367 | *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10)); | |
368 | ||
369 | out: | |
370 | g_string_free(path, TRUE); | |
371 | return ret; | |
372 | } | |
373 | ||
391e23a9 | 374 | SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt) |
61f2b7f7 BG |
375 | { |
376 | GString *path = g_string_sized_new(64);; | |
377 | int status, ret = SR_OK; | |
378 | FILE *fd; | |
379 | ||
380 | status = get_shunt_path(cg, path); | |
381 | if (status != SR_OK) { | |
382 | ret = status; | |
383 | goto out; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Can't use g_file_set_contents() here, as it calls open() with | |
388 | * O_EXEC flag in a sysfs directory thus failing with EACCES. | |
389 | */ | |
390 | fd = g_fopen(path->str, "w"); | |
391 | if (!fd) { | |
7237e912 | 392 | sr_err("Error opening %s: %s", path->str, g_strerror(errno)); |
350b8b07 BG |
393 | ret = SR_ERR_IO; |
394 | goto out; | |
61f2b7f7 BG |
395 | } |
396 | ||
34527854 | 397 | g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt)); |
61f2b7f7 BG |
398 | fclose(fd); |
399 | ||
400 | out: | |
401 | g_string_free(path, TRUE); | |
402 | return ret; | |
403 | } | |
404 | ||
740ad48a BG |
405 | SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg, |
406 | gboolean *off) | |
407 | { | |
408 | struct channel_group_priv *cgp; | |
409 | int val; | |
410 | ||
411 | cgp = cg->priv; | |
412 | ||
1fe04eb8 | 413 | if (!bl_acme_probe_has_pws(cg)) { |
740ad48a BG |
414 | sr_err("Probe has no power-switch"); |
415 | return SR_ERR_ARG; | |
416 | } | |
417 | ||
418 | val = sr_gpio_getval_export(pws_gpios[cgp->index]); | |
419 | *off = val ? FALSE : TRUE; | |
420 | ||
421 | return SR_OK; | |
422 | } | |
423 | ||
424 | SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg, | |
425 | gboolean off) | |
426 | { | |
427 | struct channel_group_priv *cgp; | |
09d217a4 | 428 | int val; |
740ad48a BG |
429 | |
430 | cgp = cg->priv; | |
431 | ||
1fe04eb8 | 432 | if (!bl_acme_probe_has_pws(cg)) { |
740ad48a BG |
433 | sr_err("Probe has no power-switch"); |
434 | return SR_ERR_ARG; | |
435 | } | |
436 | ||
09d217a4 | 437 | val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1); |
192d37e7 BG |
438 | if (val < 0) { |
439 | sr_err("Error setting power-off state: gpio: %d", | |
440 | pws_gpios[cgp->index]); | |
441 | return SR_ERR_IO; | |
442 | } | |
740ad48a BG |
443 | |
444 | return SR_OK; | |
445 | } | |
446 | ||
6b80b80d | 447 | static int channel_to_mq(struct sr_channel *ch) |
dfaee1de | 448 | { |
6b80b80d BG |
449 | struct channel_priv *chp; |
450 | ||
451 | chp = ch->priv; | |
452 | ||
453 | switch (chp->ch_type) { | |
454 | case ENRG_PWR: | |
455 | return SR_MQ_POWER; | |
456 | case ENRG_CURR: | |
457 | return SR_MQ_CURRENT; | |
458 | case ENRG_VOL: | |
459 | return SR_MQ_VOLTAGE; | |
391e23a9 | 460 | case TEMP_IN: /* Fallthrough */ |
6b80b80d BG |
461 | case TEMP_OUT: |
462 | return SR_MQ_TEMPERATURE; | |
463 | default: | |
464 | return -1; | |
465 | } | |
466 | } | |
467 | ||
468 | static int channel_to_unit(struct sr_channel *ch) | |
469 | { | |
470 | struct channel_priv *chp; | |
471 | ||
472 | chp = ch->priv; | |
473 | ||
474 | switch (chp->ch_type) { | |
475 | case ENRG_PWR: | |
476 | return SR_UNIT_WATT; | |
477 | case ENRG_CURR: | |
478 | return SR_UNIT_AMPERE; | |
479 | case ENRG_VOL: | |
480 | return SR_UNIT_VOLT; | |
391e23a9 | 481 | case TEMP_IN: /* Fallthrough */ |
6b80b80d BG |
482 | case TEMP_OUT: |
483 | return SR_UNIT_CELSIUS; | |
484 | default: | |
485 | return -1; | |
486 | } | |
487 | } | |
488 | ||
489 | /* We need to scale measurements down from the units used by the drivers. */ | |
490 | static float adjust_data(int val, int type) | |
491 | { | |
492 | switch (type) { | |
493 | case ENRG_PWR: | |
494 | return ((float)val) / 1000000.0; | |
391e23a9 UH |
495 | case ENRG_CURR: /* Fallthrough */ |
496 | case ENRG_VOL: /* Fallthrough */ | |
497 | case TEMP_IN: /* Fallthrough */ | |
6b80b80d BG |
498 | case TEMP_OUT: |
499 | return ((float)val) / 1000.0; | |
500 | default: | |
501 | return 0.0; | |
502 | } | |
503 | } | |
504 | ||
505 | static float read_sample(struct sr_channel *ch) | |
506 | { | |
507 | struct channel_priv *chp; | |
4e88b86c | 508 | char buf[16]; |
6b80b80d BG |
509 | ssize_t len; |
510 | int fd; | |
511 | ||
4e88b86c DL |
512 | chp = ch->priv; |
513 | fd = chp->fd; | |
514 | ||
515 | lseek(fd, 0, SEEK_SET); | |
516 | ||
517 | len = read(fd, buf, sizeof(buf)); | |
518 | if (len < 0) { | |
6433156c | 519 | sr_err("Error reading from channel %s (hwmon: %d): %s", |
7237e912 | 520 | ch->name, chp->probe->hwmon_num, g_strerror(errno)); |
4e88b86c DL |
521 | ch->enabled = FALSE; |
522 | return -1.0; | |
523 | } | |
524 | ||
525 | return adjust_data(strtol(buf, NULL, 10), chp->ch_type); | |
526 | } | |
527 | ||
528 | SR_PRIV int bl_acme_open_channel(struct sr_channel *ch) | |
529 | { | |
530 | struct channel_priv *chp; | |
531 | char path[64], *file; | |
532 | int fd; | |
533 | ||
6b80b80d BG |
534 | chp = ch->priv; |
535 | ||
536 | switch (chp->ch_type) { | |
537 | case ENRG_PWR: file = "power1_input"; break; | |
538 | case ENRG_CURR: file = "curr1_input"; break; | |
539 | case ENRG_VOL: file = "in1_input"; break; | |
540 | case TEMP_IN: file = "temp1_input"; break; | |
541 | case TEMP_OUT: file = "temp2_input"; break; | |
542 | default: | |
391e23a9 | 543 | sr_err("Invalid channel type: %d.", chp->ch_type); |
4e88b86c | 544 | return SR_ERR; |
6b80b80d BG |
545 | } |
546 | ||
391e23a9 | 547 | snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s", |
6b80b80d | 548 | chp->probe->hwmon_num, file); |
4e88b86c | 549 | |
6b80b80d BG |
550 | fd = open(path, O_RDONLY); |
551 | if (fd < 0) { | |
7237e912 | 552 | sr_err("Error opening %s: %s", path, g_strerror(errno)); |
6b80b80d | 553 | ch->enabled = FALSE; |
4e88b86c | 554 | return SR_ERR; |
6b80b80d BG |
555 | } |
556 | ||
4e88b86c | 557 | chp->fd = fd; |
6b80b80d | 558 | |
4e88b86c DL |
559 | return 0; |
560 | } | |
561 | ||
562 | SR_PRIV void bl_acme_close_channel(struct sr_channel *ch) | |
563 | { | |
564 | struct channel_priv *chp; | |
565 | ||
566 | chp = ch->priv; | |
567 | close(chp->fd); | |
568 | chp->fd = -1; | |
6b80b80d BG |
569 | } |
570 | ||
571 | SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data) | |
572 | { | |
a0648b1a DL |
573 | uint32_t cur_time, elapsed_time; |
574 | uint64_t nrexpiration; | |
6b80b80d BG |
575 | struct sr_datafeed_packet packet, framep; |
576 | struct sr_datafeed_analog analog; | |
577 | struct sr_dev_inst *sdi; | |
578 | struct sr_channel *ch; | |
7e5a048f | 579 | struct channel_priv *chp; |
dfaee1de | 580 | struct dev_context *devc; |
6b80b80d | 581 | GSList *chl, chonly; |
7e5a048f | 582 | unsigned i; |
dfaee1de BG |
583 | |
584 | (void)fd; | |
6b80b80d BG |
585 | (void)revents; |
586 | ||
587 | sdi = cb_data; | |
588 | if (!sdi) | |
589 | return TRUE; | |
dfaee1de | 590 | |
6b80b80d BG |
591 | devc = sdi->priv; |
592 | if (!devc) | |
dfaee1de BG |
593 | return TRUE; |
594 | ||
6b80b80d BG |
595 | packet.type = SR_DF_ANALOG; |
596 | packet.payload = &analog; | |
d0148a50 | 597 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); |
6b80b80d | 598 | |
a0648b1a DL |
599 | if (read(devc->timer_fd, &nrexpiration, sizeof(nrexpiration)) < 0) { |
600 | sr_warn("Failed to read timer information"); | |
601 | return TRUE; | |
602 | } | |
603 | ||
6b80b80d | 604 | /* |
a0648b1a DL |
605 | * We were not able to process the previous timer expiration, we are |
606 | * overloaded. | |
6b80b80d | 607 | */ |
a0648b1a DL |
608 | if (nrexpiration > 1) |
609 | devc->samples_missed += nrexpiration - 1; | |
6b80b80d | 610 | |
6b80b80d | 611 | /* |
7e5a048f BG |
612 | * XXX This is a nasty workaround... |
613 | * | |
614 | * At high sampling rates and maximum channels we are not able to | |
615 | * acquire samples fast enough, even though frontends still think | |
616 | * that samples arrive on time. This causes shifts in frontend | |
617 | * plots. | |
618 | * | |
619 | * To compensate for the delay we check if any clock events were | |
620 | * missed and - if so - don't really read the next value, but send | |
621 | * the same sample as fast as possible. We do it until we are back | |
622 | * on schedule. | |
623 | * | |
624 | * At high sampling rate this doesn't seem to visibly reduce the | |
625 | * accuracy. | |
6b80b80d | 626 | */ |
7e5a048f BG |
627 | for (i = 0; i < nrexpiration; i++) { |
628 | framep.type = SR_DF_FRAME_BEGIN; | |
629 | sr_session_send(cb_data, &framep); | |
630 | ||
631 | /* | |
632 | * Due to different units used in each channel we're sending | |
633 | * samples one-by-one. | |
634 | */ | |
635 | for (chl = sdi->channels; chl; chl = chl->next) { | |
636 | ch = chl->data; | |
637 | chp = ch->priv; | |
6b80b80d | 638 | |
7e5a048f BG |
639 | if (!ch->enabled) |
640 | continue; | |
641 | chonly.next = NULL; | |
642 | chonly.data = ch; | |
643 | analog.channels = &chonly; | |
644 | analog.num_samples = 1; | |
645 | analog.mq = channel_to_mq(chl->data); | |
646 | analog.unit = channel_to_unit(ch); | |
647 | ||
648 | if (i < 1) | |
649 | chp->val = read_sample(ch); | |
650 | ||
651 | analog.data = &chp->val; | |
652 | sr_session_send(cb_data, &packet); | |
653 | } | |
654 | ||
655 | framep.type = SR_DF_FRAME_END; | |
656 | sr_session_send(cb_data, &framep); | |
657 | } | |
6b80b80d BG |
658 | |
659 | devc->samples_read++; | |
660 | if (devc->limit_samples > 0 && | |
661 | devc->samples_read >= devc->limit_samples) { | |
662 | sr_info("Requested number of samples reached."); | |
663 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
664 | devc->last_sample_fin = g_get_monotonic_time(); | |
dfaee1de | 665 | return TRUE; |
6b80b80d BG |
666 | } else if (devc->limit_msec > 0) { |
667 | cur_time = g_get_monotonic_time(); | |
668 | elapsed_time = cur_time - devc->start_time; | |
dfaee1de | 669 | |
6b80b80d BG |
670 | if (elapsed_time >= devc->limit_msec) { |
671 | sr_info("Sampling time limit reached."); | |
672 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
673 | devc->last_sample_fin = g_get_monotonic_time(); | |
674 | return TRUE; | |
675 | } | |
dfaee1de BG |
676 | } |
677 | ||
6b80b80d | 678 | devc->last_sample_fin = g_get_monotonic_time(); |
dfaee1de BG |
679 | return TRUE; |
680 | } |