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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 | ||
20 | #include <config.h> | |
21 | #include <math.h> | |
22 | #include <string.h> | |
23 | #include <stdlib.h> | |
24 | #include <errno.h> | |
25 | #include <fcntl.h> | |
26 | #include <arpa/inet.h> | |
27 | #include <glib/gstdio.h> | |
28 | #include "protocol.h" | |
29 | #include "gpio.h" | |
30 | ||
31 | #define ACME_REV_A 1 | |
32 | #define ACME_REV_B 2 | |
33 | ||
34 | enum channel_type { | |
35 | ENRG_PWR = 1, | |
36 | ENRG_CURR, | |
37 | ENRG_VOL, | |
38 | TEMP_IN, | |
39 | TEMP_OUT, | |
40 | }; | |
41 | ||
42 | struct channel_group_priv { | |
43 | uint8_t rev; | |
44 | int hwmon_num; | |
45 | int probe_type; | |
46 | int index; | |
47 | int has_pws; | |
48 | uint32_t pws_gpio; | |
49 | }; | |
50 | ||
51 | struct channel_priv { | |
52 | int ch_type; | |
53 | int fd; | |
54 | int digits; | |
55 | float val; | |
56 | struct channel_group_priv *probe; | |
57 | }; | |
58 | ||
59 | #define EEPROM_SERIAL_SIZE 16 | |
60 | #define EEPROM_TAG_SIZE 32 | |
61 | ||
62 | #define EEPROM_PROBE_TYPE_USB 1 | |
63 | #define EEPROM_PROBE_TYPE_JACK 2 | |
64 | #define EEPROM_PROBE_TYPE_HE10 3 | |
65 | ||
66 | struct probe_eeprom { | |
67 | uint32_t type; | |
68 | uint32_t rev; | |
69 | uint32_t shunt; | |
70 | uint8_t pwr_sw; | |
71 | uint8_t serial[EEPROM_SERIAL_SIZE]; | |
72 | int8_t tag[EEPROM_TAG_SIZE]; | |
73 | }; | |
74 | ||
75 | #define EEPROM_SIZE (3 * sizeof(uint32_t) + 1 + EEPROM_SERIAL_SIZE + EEPROM_TAG_SIZE) | |
76 | ||
77 | #define EEPROM_OFF_TYPE 0 | |
78 | #define EEPROM_OFF_REV sizeof(uint32_t) | |
79 | #define EEPROM_OFF_SHUNT (2 * sizeof(uint32_t)) | |
80 | #define EEPROM_OFF_PWR_SW (3 * sizeof(uint32_t)) | |
81 | #define EEPROM_OFF_SERIAL (3 * sizeof(uint32_t) + 1) | |
82 | #define EEPROM_OFF_TAG (EEPROM_OFF_SERIAL + EEPROM_SERIAL_SIZE) | |
83 | ||
84 | static const uint8_t enrg_i2c_addrs[] = { | |
85 | 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47, | |
86 | }; | |
87 | ||
88 | static const uint8_t temp_i2c_addrs[] = { | |
89 | 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b, | |
90 | }; | |
91 | ||
92 | static const uint32_t revA_pws_gpios[] = { | |
93 | 486, 498, 502, 482, 478, 506, 510, 474, | |
94 | }; | |
95 | ||
96 | static const uint32_t revA_pws_info_gpios[] = { | |
97 | 487, 499, 503, 483, 479, 507, 511, 475, | |
98 | }; | |
99 | ||
100 | static const uint32_t revB_pws_gpios[] = { | |
101 | 489, 491, 493, 495, 497, 499, 501, 503, | |
102 | }; | |
103 | ||
104 | #define MOHM_TO_UOHM(x) ((x) * 1000) | |
105 | #define UOHM_TO_MOHM(x) ((x) / 1000) | |
106 | ||
107 | SR_PRIV uint8_t bl_acme_get_enrg_addr(int index) | |
108 | { | |
109 | return enrg_i2c_addrs[index]; | |
110 | } | |
111 | ||
112 | SR_PRIV uint8_t bl_acme_get_temp_addr(int index) | |
113 | { | |
114 | return temp_i2c_addrs[index]; | |
115 | } | |
116 | ||
117 | SR_PRIV gboolean bl_acme_is_sane(void) | |
118 | { | |
119 | gboolean status; | |
120 | ||
121 | /* | |
122 | * We expect sysfs to be present and mounted at /sys, ina226 and | |
123 | * tmp435 sensors detected by the system and their appropriate | |
124 | * drivers loaded and functional. | |
125 | */ | |
126 | status = g_file_test("/sys", G_FILE_TEST_IS_DIR); | |
127 | if (!status) { | |
128 | sr_err("/sys/ directory not found - sysfs not mounted?"); | |
129 | return FALSE; | |
130 | } | |
131 | ||
132 | return TRUE; | |
133 | } | |
134 | ||
135 | static void probe_name_path(unsigned int addr, GString *path) | |
136 | { | |
137 | g_string_printf(path, | |
138 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr); | |
139 | } | |
140 | ||
141 | /* | |
142 | * For given address fill buf with the path to appropriate hwmon entry. | |
143 | */ | |
144 | static void probe_hwmon_path(unsigned int addr, GString *path) | |
145 | { | |
146 | g_string_printf(path, | |
147 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr); | |
148 | } | |
149 | ||
150 | static void probe_eeprom_path(unsigned int addr, GString *path) | |
151 | { | |
152 | g_string_printf(path, | |
153 | "/sys/class/i2c-dev/i2c-1/device/1-00%02x/eeprom", | |
154 | addr + 0x10); | |
155 | } | |
156 | ||
157 | SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr, | |
158 | int prb_num, const char *prb_name) | |
159 | { | |
160 | gboolean ret = FALSE, status; | |
161 | char *buf = NULL; | |
162 | GString *path = g_string_sized_new(64); | |
163 | GError *err = NULL; | |
164 | gsize size; | |
165 | ||
166 | probe_name_path(addr, path); | |
167 | status = g_file_get_contents(path->str, &buf, &size, &err); | |
168 | if (!status) { | |
169 | /* Don't log "No such file or directory" messages. */ | |
170 | if (err->code != G_FILE_ERROR_NOENT) | |
171 | sr_dbg("Name for probe %d can't be read (%d): %s", | |
172 | prb_num, err->code, err->message); | |
173 | g_string_free(path, TRUE); | |
174 | g_error_free(err); | |
175 | return ret; | |
176 | } | |
177 | ||
178 | if (!strncmp(buf, prb_name, strlen(prb_name))) { | |
179 | /* | |
180 | * Correct driver registered on this address - but is | |
181 | * there an actual probe connected? | |
182 | */ | |
183 | probe_hwmon_path(addr, path); | |
184 | status = g_file_test(path->str, G_FILE_TEST_IS_DIR); | |
185 | if (status) { | |
186 | /* We have found an ACME probe. */ | |
187 | ret = TRUE; | |
188 | } | |
189 | } | |
190 | ||
191 | g_free(buf); | |
192 | g_string_free(path, TRUE); | |
193 | ||
194 | return ret; | |
195 | } | |
196 | ||
197 | static int get_hwmon_index(unsigned int addr) | |
198 | { | |
199 | int status, hwmon; | |
200 | GString *path = g_string_sized_new(64); | |
201 | GError *err = NULL; | |
202 | GDir *dir; | |
203 | ||
204 | probe_hwmon_path(addr, path); | |
205 | dir = g_dir_open(path->str, 0, &err); | |
206 | if (!dir) { | |
207 | sr_err("Error opening %s: %s", path->str, err->message); | |
208 | g_string_free(path, TRUE); | |
209 | g_error_free(err); | |
210 | return -1; | |
211 | } | |
212 | ||
213 | g_string_free(path, TRUE); | |
214 | ||
215 | /* | |
216 | * The directory should contain a single file named hwmonX where X | |
217 | * is the hwmon index. | |
218 | */ | |
219 | status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon); | |
220 | g_dir_close(dir); | |
221 | if (status != 1) { | |
222 | sr_err("Unable to determine the hwmon entry"); | |
223 | return -1; | |
224 | } | |
225 | ||
226 | return hwmon; | |
227 | } | |
228 | ||
229 | static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg, | |
230 | int index, int type) | |
231 | { | |
232 | struct channel_priv *cp; | |
233 | struct dev_context *devc; | |
234 | struct sr_channel *ch; | |
235 | char *name; | |
236 | ||
237 | devc = sdi->priv; | |
238 | ||
239 | switch (type) { | |
240 | case ENRG_PWR: | |
241 | name = g_strdup_printf("P%d_ENRG_PWR", index); | |
242 | break; | |
243 | case ENRG_CURR: | |
244 | name = g_strdup_printf("P%d_ENRG_CURR", index); | |
245 | break; | |
246 | case ENRG_VOL: | |
247 | name = g_strdup_printf("P%d_ENRG_VOL", index); | |
248 | break; | |
249 | case TEMP_IN: | |
250 | name = g_strdup_printf("P%d_TEMP_IN", index); | |
251 | break; | |
252 | case TEMP_OUT: | |
253 | name = g_strdup_printf("P%d_TEMP_OUT", index); | |
254 | break; | |
255 | default: | |
256 | sr_err("Invalid channel type: %d.", type); | |
257 | return; | |
258 | } | |
259 | ||
260 | cp = g_malloc0(sizeof(struct channel_priv)); | |
261 | cp->ch_type = type; | |
262 | cp->probe = cg->priv; | |
263 | ||
264 | ch = sr_channel_new(sdi, devc->num_channels++, | |
265 | SR_CHANNEL_ANALOG, TRUE, name); | |
266 | g_free(name); | |
267 | ||
268 | ch->priv = cp; | |
269 | cg->channels = g_slist_append(cg->channels, ch); | |
270 | } | |
271 | ||
272 | static int read_probe_eeprom(unsigned int addr, struct probe_eeprom *eeprom) | |
273 | { | |
274 | GString *path = g_string_sized_new(64); | |
275 | char eeprom_buf[EEPROM_SIZE]; | |
276 | ssize_t rd; | |
277 | int fd; | |
278 | ||
279 | probe_eeprom_path(addr, path); | |
280 | fd = g_open(path->str, O_RDONLY); | |
281 | g_string_free(path, TRUE); | |
282 | if (fd < 0) | |
283 | return -1; | |
284 | ||
285 | rd = read(fd, eeprom_buf, EEPROM_SIZE); | |
286 | close(fd); | |
287 | if (rd != EEPROM_SIZE) | |
288 | return -1; | |
289 | ||
290 | eeprom->type = RB32(eeprom_buf + EEPROM_OFF_TYPE); | |
291 | eeprom->rev = RB32(eeprom_buf + EEPROM_OFF_REV); | |
292 | eeprom->shunt = RB32(eeprom_buf + EEPROM_OFF_SHUNT); | |
293 | eeprom->pwr_sw = R8(eeprom_buf + EEPROM_OFF_PWR_SW); | |
294 | /* Don't care about the serial number and tag for now. */ | |
295 | ||
296 | /* Check if we have some sensible values. */ | |
297 | if (eeprom->rev != 'B') | |
298 | /* 'B' is the only supported revision with EEPROM for now. */ | |
299 | return -1; | |
300 | ||
301 | if (eeprom->type != EEPROM_PROBE_TYPE_USB && | |
302 | eeprom->type != EEPROM_PROBE_TYPE_JACK && | |
303 | eeprom->type != EEPROM_PROBE_TYPE_HE10) | |
304 | return -1; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /* Some i2c slave addresses on revision B probes differ from revision A. */ | |
310 | static int revB_addr_to_num(unsigned int addr) | |
311 | { | |
312 | switch (addr) { | |
313 | case 0x44: return 5; | |
314 | case 0x45: return 6; | |
315 | case 0x42: return 3; | |
316 | case 0x43: return 4; | |
317 | default: return addr - 0x3f; | |
318 | } | |
319 | } | |
320 | ||
321 | SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type, | |
322 | unsigned int addr, int prb_num) | |
323 | { | |
324 | struct sr_channel_group *cg; | |
325 | struct channel_group_priv *cgp; | |
326 | struct probe_eeprom eeprom; | |
327 | int hwmon, status; | |
328 | uint32_t gpio; | |
329 | ||
330 | /* Obtain the hwmon index. */ | |
331 | hwmon = get_hwmon_index(addr); | |
332 | if (hwmon < 0) | |
333 | return FALSE; | |
334 | ||
335 | cgp = g_malloc0(sizeof(struct channel_group_priv)); | |
336 | cg = sr_channel_group_new(sdi, NULL, cgp); | |
337 | ||
338 | /* | |
339 | * See if we can read the EEPROM contents. If not, assume it's | |
340 | * a revision A probe. | |
341 | */ | |
342 | memset(&eeprom, 0, sizeof(struct probe_eeprom)); | |
343 | status = read_probe_eeprom(addr, &eeprom); | |
344 | cgp->rev = status < 0 ? ACME_REV_A : ACME_REV_B; | |
345 | ||
346 | prb_num = cgp->rev == ACME_REV_A ? prb_num : revB_addr_to_num(addr); | |
347 | ||
348 | cgp->hwmon_num = hwmon; | |
349 | cgp->probe_type = type; | |
350 | cgp->index = prb_num - 1; | |
351 | cg->name = g_strdup_printf("Probe_%d", prb_num); | |
352 | ||
353 | if (cgp->rev == ACME_REV_A) { | |
354 | gpio = revA_pws_info_gpios[cgp->index]; | |
355 | cgp->has_pws = sr_gpio_getval_export(gpio); | |
356 | cgp->pws_gpio = revA_pws_gpios[cgp->index]; | |
357 | } else { | |
358 | cgp->has_pws = eeprom.pwr_sw; | |
359 | cgp->pws_gpio = revB_pws_gpios[cgp->index]; | |
360 | ||
361 | /* | |
362 | * For revision B we can already try to set the shunt | |
363 | * resistance according to the EEPROM contents. | |
364 | * | |
365 | * Keep the default value if shunt in EEPROM == 0. | |
366 | */ | |
367 | if (eeprom.shunt > 0) | |
368 | bl_acme_set_shunt(cg, UOHM_TO_MOHM(eeprom.shunt)); | |
369 | } | |
370 | ||
371 | if (type == PROBE_ENRG) { | |
372 | append_channel(sdi, cg, prb_num, ENRG_PWR); | |
373 | append_channel(sdi, cg, prb_num, ENRG_CURR); | |
374 | append_channel(sdi, cg, prb_num, ENRG_VOL); | |
375 | } else if (type == PROBE_TEMP) { | |
376 | append_channel(sdi, cg, prb_num, TEMP_IN); | |
377 | append_channel(sdi, cg, prb_num, TEMP_OUT); | |
378 | } else { | |
379 | sr_err("Invalid probe type: %d.", type); | |
380 | } | |
381 | ||
382 | return TRUE; | |
383 | } | |
384 | ||
385 | SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg) | |
386 | { | |
387 | struct channel_group_priv *cgp = cg->priv; | |
388 | ||
389 | return cgp->probe_type; | |
390 | } | |
391 | ||
392 | SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg) | |
393 | { | |
394 | struct channel_group_priv *cgp = cg->priv; | |
395 | ||
396 | return cgp->has_pws; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Sets path to the hwmon attribute if this channel group | |
401 | * supports shunt resistance setting. The caller has to supply | |
402 | * a valid GString. | |
403 | */ | |
404 | static int get_shunt_path(const struct sr_channel_group *cg, GString *path) | |
405 | { | |
406 | struct channel_group_priv *cgp; | |
407 | int ret = SR_OK, status; | |
408 | ||
409 | cgp = cg->priv; | |
410 | ||
411 | if (cgp->probe_type != PROBE_ENRG) { | |
412 | sr_err("Probe doesn't support shunt resistance setting"); | |
413 | return SR_ERR_ARG; | |
414 | } | |
415 | ||
416 | g_string_append_printf(path, | |
417 | "/sys/class/hwmon/hwmon%d/shunt_resistor", | |
418 | cgp->hwmon_num); | |
419 | ||
420 | /* | |
421 | * The shunt_resistor sysfs attribute is available | |
422 | * in the Linux kernel since version 3.20. We have | |
423 | * to notify the user if this attribute is not present. | |
424 | */ | |
425 | status = g_file_test(path->str, G_FILE_TEST_EXISTS); | |
426 | if (!status) { | |
427 | sr_err("shunt_resistance attribute not present, please update " | |
428 | "your kernel to version >=3.20"); | |
429 | return SR_ERR_NA; | |
430 | } | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Try setting the update_interval sysfs attribute for each probe according | |
437 | * to samplerate. | |
438 | */ | |
439 | SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi, | |
440 | uint64_t samplerate) | |
441 | { | |
442 | struct sr_channel_group *cg; | |
443 | struct channel_group_priv *cgp; | |
444 | GString *hwmon; | |
445 | GSList *l; | |
446 | FILE *fd; | |
447 | ||
448 | for (l = sdi->channel_groups; l != NULL; l = l->next) { | |
449 | cg = l->data; | |
450 | cgp = cg->priv; | |
451 | ||
452 | hwmon = g_string_sized_new(64); | |
453 | g_string_append_printf(hwmon, | |
454 | "/sys/class/hwmon/hwmon%d/update_interval", | |
455 | cgp->hwmon_num); | |
456 | ||
457 | if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) { | |
458 | fd = g_fopen(hwmon->str, "w"); | |
459 | if (!fd) { | |
460 | g_string_free(hwmon, TRUE); | |
461 | continue; | |
462 | } | |
463 | ||
464 | g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate); | |
465 | fclose(fd); | |
466 | } | |
467 | ||
468 | g_string_free(hwmon, TRUE); | |
469 | } | |
470 | } | |
471 | ||
472 | SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg, | |
473 | uint64_t *shunt) | |
474 | { | |
475 | GString *path = g_string_sized_new(64); | |
476 | gchar *contents; | |
477 | int status, ret = SR_OK; | |
478 | GError *err = NULL; | |
479 | ||
480 | status = get_shunt_path(cg, path); | |
481 | if (status != SR_OK) { | |
482 | ret = status; | |
483 | goto out; | |
484 | } | |
485 | ||
486 | status = g_file_get_contents(path->str, &contents, NULL, &err); | |
487 | if (!status) { | |
488 | sr_err("Error reading shunt resistance: %s", err->message); | |
489 | ret = SR_ERR_IO; | |
490 | g_error_free(err); | |
491 | goto out; | |
492 | } | |
493 | ||
494 | *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10)); | |
495 | ||
496 | out: | |
497 | g_string_free(path, TRUE); | |
498 | return ret; | |
499 | } | |
500 | ||
501 | SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt) | |
502 | { | |
503 | GString *path = g_string_sized_new(64);; | |
504 | int status, ret = SR_OK; | |
505 | FILE *fd; | |
506 | ||
507 | status = get_shunt_path(cg, path); | |
508 | if (status != SR_OK) { | |
509 | ret = status; | |
510 | goto out; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Can't use g_file_set_contents() here, as it calls open() with | |
515 | * O_EXEC flag in a sysfs directory thus failing with EACCES. | |
516 | */ | |
517 | fd = g_fopen(path->str, "w"); | |
518 | if (!fd) { | |
519 | sr_err("Error opening %s: %s", path->str, g_strerror(errno)); | |
520 | ret = SR_ERR_IO; | |
521 | goto out; | |
522 | } | |
523 | ||
524 | g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt)); | |
525 | fclose(fd); | |
526 | ||
527 | out: | |
528 | g_string_free(path, TRUE); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg, | |
533 | gboolean *off) | |
534 | { | |
535 | struct channel_group_priv *cgp; | |
536 | int val; | |
537 | ||
538 | cgp = cg->priv; | |
539 | ||
540 | if (!bl_acme_probe_has_pws(cg)) { | |
541 | sr_err("Probe has no power-switch"); | |
542 | return SR_ERR_ARG; | |
543 | } | |
544 | ||
545 | val = sr_gpio_getval_export(cgp->pws_gpio); | |
546 | *off = val ? FALSE : TRUE; | |
547 | ||
548 | return SR_OK; | |
549 | } | |
550 | ||
551 | SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg, | |
552 | gboolean off) | |
553 | { | |
554 | struct channel_group_priv *cgp; | |
555 | int val; | |
556 | ||
557 | cgp = cg->priv; | |
558 | ||
559 | if (!bl_acme_probe_has_pws(cg)) { | |
560 | sr_err("Probe has no power-switch"); | |
561 | return SR_ERR_ARG; | |
562 | } | |
563 | ||
564 | val = sr_gpio_setval_export(cgp->pws_gpio, off ? 0 : 1); | |
565 | if (val < 0) { | |
566 | sr_err("Error setting power-off state: gpio: %d", | |
567 | cgp->pws_gpio); | |
568 | return SR_ERR_IO; | |
569 | } | |
570 | ||
571 | return SR_OK; | |
572 | } | |
573 | ||
574 | static int channel_to_mq(struct sr_channel *ch) | |
575 | { | |
576 | struct channel_priv *chp; | |
577 | ||
578 | chp = ch->priv; | |
579 | ||
580 | switch (chp->ch_type) { | |
581 | case ENRG_PWR: | |
582 | return SR_MQ_POWER; | |
583 | case ENRG_CURR: | |
584 | return SR_MQ_CURRENT; | |
585 | case ENRG_VOL: | |
586 | return SR_MQ_VOLTAGE; | |
587 | case TEMP_IN: /* Fallthrough */ | |
588 | case TEMP_OUT: | |
589 | return SR_MQ_TEMPERATURE; | |
590 | default: | |
591 | return -1; | |
592 | } | |
593 | } | |
594 | ||
595 | static int channel_to_unit(struct sr_channel *ch) | |
596 | { | |
597 | struct channel_priv *chp; | |
598 | ||
599 | chp = ch->priv; | |
600 | ||
601 | switch (chp->ch_type) { | |
602 | case ENRG_PWR: | |
603 | return SR_UNIT_WATT; | |
604 | case ENRG_CURR: | |
605 | return SR_UNIT_AMPERE; | |
606 | case ENRG_VOL: | |
607 | return SR_UNIT_VOLT; | |
608 | case TEMP_IN: /* Fallthrough */ | |
609 | case TEMP_OUT: | |
610 | return SR_UNIT_CELSIUS; | |
611 | default: | |
612 | return -1; | |
613 | } | |
614 | } | |
615 | ||
616 | /* We need to scale measurements down from the units used by the drivers. */ | |
617 | static int type_digits(int type) | |
618 | { | |
619 | switch (type) { | |
620 | case ENRG_PWR: | |
621 | return 6; | |
622 | case ENRG_CURR: /* Fallthrough */ | |
623 | case ENRG_VOL: /* Fallthrough */ | |
624 | case TEMP_IN: /* Fallthrough */ | |
625 | case TEMP_OUT: | |
626 | return 3; | |
627 | default: | |
628 | return 0; | |
629 | } | |
630 | } | |
631 | ||
632 | static float read_sample(struct sr_channel *ch) | |
633 | { | |
634 | struct channel_priv *chp; | |
635 | char buf[16]; | |
636 | ssize_t len; | |
637 | int fd; | |
638 | ||
639 | chp = ch->priv; | |
640 | fd = chp->fd; | |
641 | ||
642 | lseek(fd, 0, SEEK_SET); | |
643 | ||
644 | len = read(fd, buf, sizeof(buf)); | |
645 | if (len < 0) { | |
646 | sr_err("Error reading from channel %s (hwmon: %d): %s", | |
647 | ch->name, chp->probe->hwmon_num, g_strerror(errno)); | |
648 | ch->enabled = FALSE; | |
649 | return -1.0; | |
650 | } | |
651 | ||
652 | chp->digits = type_digits(chp->ch_type); | |
653 | return strtol(buf, NULL, 10) * powf(10, -chp->digits); | |
654 | } | |
655 | ||
656 | SR_PRIV int bl_acme_open_channel(struct sr_channel *ch) | |
657 | { | |
658 | struct channel_priv *chp; | |
659 | char path[64]; | |
660 | const char *file; | |
661 | int fd; | |
662 | ||
663 | chp = ch->priv; | |
664 | ||
665 | switch (chp->ch_type) { | |
666 | case ENRG_PWR: file = "power1_input"; break; | |
667 | case ENRG_CURR: file = "curr1_input"; break; | |
668 | case ENRG_VOL: file = "in1_input"; break; | |
669 | case TEMP_IN: file = "temp1_input"; break; | |
670 | case TEMP_OUT: file = "temp2_input"; break; | |
671 | default: | |
672 | sr_err("Invalid channel type: %d.", chp->ch_type); | |
673 | return SR_ERR; | |
674 | } | |
675 | ||
676 | snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s", | |
677 | chp->probe->hwmon_num, file); | |
678 | ||
679 | fd = open(path, O_RDONLY); | |
680 | if (fd < 0) { | |
681 | sr_err("Error opening %s: %s", path, g_strerror(errno)); | |
682 | ch->enabled = FALSE; | |
683 | return SR_ERR; | |
684 | } | |
685 | ||
686 | chp->fd = fd; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | SR_PRIV void bl_acme_close_channel(struct sr_channel *ch) | |
692 | { | |
693 | struct channel_priv *chp; | |
694 | ||
695 | chp = ch->priv; | |
696 | close(chp->fd); | |
697 | chp->fd = -1; | |
698 | } | |
699 | ||
700 | SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data) | |
701 | { | |
702 | uint64_t nrexpiration; | |
703 | struct sr_datafeed_packet packet; | |
704 | struct sr_datafeed_analog analog; | |
705 | struct sr_analog_encoding encoding; | |
706 | struct sr_analog_meaning meaning; | |
707 | struct sr_analog_spec spec; | |
708 | struct sr_dev_inst *sdi; | |
709 | struct sr_channel *ch; | |
710 | struct channel_priv *chp; | |
711 | struct dev_context *devc; | |
712 | GSList *chl, chonly; | |
713 | unsigned i; | |
714 | ||
715 | (void)fd; | |
716 | (void)revents; | |
717 | ||
718 | sdi = cb_data; | |
719 | if (!sdi) | |
720 | return TRUE; | |
721 | ||
722 | devc = sdi->priv; | |
723 | if (!devc) | |
724 | return TRUE; | |
725 | ||
726 | packet.type = SR_DF_ANALOG; | |
727 | packet.payload = &analog; | |
728 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
729 | ||
730 | if (read(devc->timer_fd, &nrexpiration, sizeof(nrexpiration)) < 0) { | |
731 | sr_warn("Failed to read timer information"); | |
732 | return TRUE; | |
733 | } | |
734 | ||
735 | /* | |
736 | * We were not able to process the previous timer expiration, we are | |
737 | * overloaded. | |
738 | */ | |
739 | if (nrexpiration > 1) | |
740 | devc->samples_missed += nrexpiration - 1; | |
741 | ||
742 | /* | |
743 | * XXX This is a nasty workaround... | |
744 | * | |
745 | * At high sampling rates and maximum channels we are not able to | |
746 | * acquire samples fast enough, even though frontends still think | |
747 | * that samples arrive on time. This causes shifts in frontend | |
748 | * plots. | |
749 | * | |
750 | * To compensate for the delay we check if any clock events were | |
751 | * missed and - if so - don't really read the next value, but send | |
752 | * the same sample as fast as possible. We do it until we are back | |
753 | * on schedule. | |
754 | * | |
755 | * At high sampling rate this doesn't seem to visibly reduce the | |
756 | * accuracy. | |
757 | */ | |
758 | for (i = 0; i < nrexpiration; i++) { | |
759 | std_session_send_df_frame_begin(sdi); | |
760 | ||
761 | /* | |
762 | * Due to different units used in each channel we're sending | |
763 | * samples one-by-one. | |
764 | */ | |
765 | for (chl = sdi->channels; chl; chl = chl->next) { | |
766 | ch = chl->data; | |
767 | chp = ch->priv; | |
768 | ||
769 | if (!ch->enabled) | |
770 | continue; | |
771 | chonly.next = NULL; | |
772 | chonly.data = ch; | |
773 | analog.num_samples = 1; | |
774 | analog.meaning->channels = &chonly; | |
775 | analog.meaning->mq = channel_to_mq(chl->data); | |
776 | analog.meaning->unit = channel_to_unit(ch); | |
777 | ||
778 | if (i < 1) | |
779 | chp->val = read_sample(ch); | |
780 | ||
781 | analog.encoding->digits = chp->digits; | |
782 | analog.spec->spec_digits = chp->digits; | |
783 | analog.data = &chp->val; | |
784 | sr_session_send(sdi, &packet); | |
785 | } | |
786 | ||
787 | std_session_send_df_frame_end(sdi); | |
788 | } | |
789 | ||
790 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
791 | ||
792 | if (sr_sw_limits_check(&devc->limits)) { | |
793 | sr_dev_acquisition_stop(sdi); | |
794 | return TRUE; | |
795 | } | |
796 | ||
797 | return TRUE; | |
798 | } |