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