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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 <string.h> | |
21 | #include <stdlib.h> | |
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <glib/gstdio.h> | |
25 | #include "protocol.h" | |
26 | #include "gpio.h" | |
27 | ||
28 | struct channel_group_priv { | |
29 | int hwmon_num; | |
30 | int probe_type; | |
31 | int index; | |
32 | }; | |
33 | ||
34 | struct channel_priv { | |
35 | int ch_type; | |
36 | struct channel_group_priv *probe; | |
37 | }; | |
38 | ||
39 | static const uint8_t enrg_i2c_addrs[] = { | |
40 | 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47, | |
41 | }; | |
42 | ||
43 | static const uint8_t temp_i2c_addrs[] = { | |
44 | 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b, | |
45 | }; | |
46 | ||
47 | static const uint32_t pws_gpios[] = { | |
48 | 486, 498, 502, 482, 478, 506, 510, 474, | |
49 | }; | |
50 | ||
51 | static const uint32_t pws_info_gpios[] = { | |
52 | 487, 499, 503, 483, 479, 507, 511, 475, | |
53 | }; | |
54 | ||
55 | #define MOHM_TO_UOHM(x) ((x) * 1000) | |
56 | #define UOHM_TO_MOHM(x) ((x) / 1000) | |
57 | ||
58 | SR_PRIV uint8_t bl_acme_get_enrg_addr(int index) | |
59 | { | |
60 | return enrg_i2c_addrs[index]; | |
61 | } | |
62 | ||
63 | SR_PRIV uint8_t bl_acme_get_temp_addr(int index) | |
64 | { | |
65 | return temp_i2c_addrs[index]; | |
66 | } | |
67 | ||
68 | SR_PRIV gboolean bl_acme_is_sane(void) | |
69 | { | |
70 | gboolean status; | |
71 | ||
72 | /* | |
73 | * We expect sysfs to be present and mounted at /sys, ina226 and | |
74 | * tmp435 sensors detected by the system and their appropriate | |
75 | * drivers loaded and functional. | |
76 | */ | |
77 | status = g_file_test("/sys", G_FILE_TEST_IS_DIR); | |
78 | if (!status) { | |
79 | sr_err("/sys/ directory not found - sysfs not mounted?"); | |
80 | return FALSE; | |
81 | } | |
82 | ||
83 | return TRUE; | |
84 | } | |
85 | ||
86 | static void probe_name_path(unsigned int addr, GString *path) | |
87 | { | |
88 | g_string_printf(path, | |
89 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr); | |
90 | } | |
91 | ||
92 | /* | |
93 | * For given address fill buf with the path to appropriate hwmon entry. | |
94 | */ | |
95 | static void probe_hwmon_path(unsigned int addr, GString *path) | |
96 | { | |
97 | g_string_printf(path, | |
98 | "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr); | |
99 | } | |
100 | ||
101 | SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr, | |
102 | int prb_num, const char *prb_name) | |
103 | { | |
104 | gboolean ret = FALSE, status; | |
105 | char *buf = NULL; | |
106 | GString *path = g_string_sized_new(64); | |
107 | GError *err = NULL; | |
108 | gsize size; | |
109 | ||
110 | probe_name_path(addr, path); | |
111 | status = g_file_get_contents(path->str, &buf, &size, &err); | |
112 | if (!status) { | |
113 | sr_dbg("Name for probe %d can't be read: %s", | |
114 | prb_num, err->message); | |
115 | g_string_free(path, TRUE); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | if (!strncmp(buf, prb_name, strlen(prb_name))) { | |
120 | /* | |
121 | * Correct driver registered on this address - but is | |
122 | * there an actual probe connected? | |
123 | */ | |
124 | probe_hwmon_path(addr, path); | |
125 | status = g_file_test(path->str, G_FILE_TEST_IS_DIR); | |
126 | if (status) { | |
127 | /* We have found an ACME probe. */ | |
128 | ret = TRUE; | |
129 | } | |
130 | } | |
131 | ||
132 | g_free(buf); | |
133 | g_string_free(path, TRUE); | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | static int get_hwmon_index(unsigned int addr) | |
139 | { | |
140 | int status, hwmon; | |
141 | GString *path = g_string_sized_new(64); | |
142 | GError *err = NULL; | |
143 | GDir *dir; | |
144 | ||
145 | probe_hwmon_path(addr, path); | |
146 | dir = g_dir_open(path->str, 0, &err); | |
147 | if (!dir) { | |
148 | sr_err("Error opening %s: %s", path->str, err->message); | |
149 | g_string_free(path, TRUE); | |
150 | return -1; | |
151 | } | |
152 | ||
153 | g_string_free(path, TRUE); | |
154 | ||
155 | /* | |
156 | * The directory should contain a single file named hwmonX where X | |
157 | * is the hwmon index. | |
158 | */ | |
159 | status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon); | |
160 | g_dir_close(dir); | |
161 | if (status != 1) { | |
162 | sr_err("Unable to determine the hwmon entry"); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | return hwmon; | |
167 | } | |
168 | ||
169 | static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg, | |
170 | int index, int type) | |
171 | { | |
172 | struct channel_priv *cp; | |
173 | struct dev_context *devc; | |
174 | struct sr_channel *ch; | |
175 | char *name; | |
176 | ||
177 | devc = sdi->priv; | |
178 | ||
179 | switch (type) { | |
180 | case ENRG_PWR: | |
181 | name = g_strdup_printf("P%d_ENRG_PWR", index); | |
182 | break; | |
183 | case ENRG_CURR: | |
184 | name = g_strdup_printf("P%d_ENRG_CURR", index); | |
185 | break; | |
186 | case ENRG_VOL: | |
187 | name = g_strdup_printf("P%d_ENRG_VOL", index); | |
188 | break; | |
189 | case TEMP_IN: | |
190 | name = g_strdup_printf("P%d_TEMP_IN", index); | |
191 | break; | |
192 | case TEMP_OUT: | |
193 | name = g_strdup_printf("P%d_TEMP_OUT", index); | |
194 | break; | |
195 | default: | |
196 | sr_err("Invalid channel type: %d.", type); | |
197 | return; | |
198 | } | |
199 | ||
200 | cp = g_malloc0(sizeof(struct channel_priv)); | |
201 | cp->ch_type = type; | |
202 | cp->probe = cg->priv; | |
203 | ||
204 | ch = sr_channel_new(sdi, devc->num_channels++, | |
205 | SR_CHANNEL_ANALOG, TRUE, name); | |
206 | g_free(name); | |
207 | ||
208 | ch->priv = cp; | |
209 | cg->channels = g_slist_append(cg->channels, ch); | |
210 | } | |
211 | ||
212 | SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type, | |
213 | unsigned int addr, int prb_num) | |
214 | { | |
215 | struct sr_channel_group *cg; | |
216 | struct channel_group_priv *cgp; | |
217 | int hwmon; | |
218 | ||
219 | /* Obtain the hwmon index. */ | |
220 | hwmon = get_hwmon_index(addr); | |
221 | if (hwmon < 0) | |
222 | return FALSE; | |
223 | ||
224 | cg = g_malloc0(sizeof(struct sr_channel_group)); | |
225 | cgp = g_malloc0(sizeof(struct channel_group_priv)); | |
226 | cgp->hwmon_num = hwmon; | |
227 | cgp->probe_type = type; | |
228 | cgp->index = prb_num - 1; | |
229 | cg->name = g_strdup_printf("Probe_%d", prb_num); | |
230 | cg->priv = cgp; | |
231 | ||
232 | if (type == PROBE_ENRG) { | |
233 | append_channel(sdi, cg, prb_num, ENRG_PWR); | |
234 | append_channel(sdi, cg, prb_num, ENRG_CURR); | |
235 | append_channel(sdi, cg, prb_num, ENRG_VOL); | |
236 | } else if (type == PROBE_TEMP) { | |
237 | append_channel(sdi, cg, prb_num, TEMP_IN); | |
238 | append_channel(sdi, cg, prb_num, TEMP_OUT); | |
239 | } else { | |
240 | sr_err("Invalid probe type: %d.", type); | |
241 | } | |
242 | ||
243 | sdi->channel_groups = g_slist_append(sdi->channel_groups, cg); | |
244 | ||
245 | return TRUE; | |
246 | } | |
247 | ||
248 | SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg) | |
249 | { | |
250 | struct channel_group_priv *cgp = cg->priv; | |
251 | ||
252 | return cgp->probe_type; | |
253 | } | |
254 | ||
255 | SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg) | |
256 | { | |
257 | struct channel_group_priv *cgp = cg->priv; | |
258 | ||
259 | return sr_gpio_getval_export(pws_info_gpios[cgp->index]); | |
260 | } | |
261 | ||
262 | /* | |
263 | * Sets path to the hwmon attribute if this channel group | |
264 | * supports shunt resistance setting. The caller has to supply | |
265 | * a valid GString. | |
266 | */ | |
267 | static int get_shunt_path(const struct sr_channel_group *cg, GString *path) | |
268 | { | |
269 | struct channel_group_priv *cgp; | |
270 | int ret = SR_OK, status; | |
271 | ||
272 | cgp = cg->priv; | |
273 | ||
274 | if (cgp->probe_type != PROBE_ENRG) { | |
275 | sr_err("Probe doesn't support shunt resistance setting"); | |
276 | return SR_ERR_ARG; | |
277 | } | |
278 | ||
279 | g_string_append_printf(path, | |
280 | "/sys/class/hwmon/hwmon%d/shunt_resistor", | |
281 | cgp->hwmon_num); | |
282 | ||
283 | /* | |
284 | * The shunt_resistor sysfs attribute is available | |
285 | * in the Linux kernel since version 3.20. We have | |
286 | * to notify the user if this attribute is not present. | |
287 | */ | |
288 | status = g_file_test(path->str, G_FILE_TEST_EXISTS); | |
289 | if (!status) { | |
290 | sr_err("shunt_resistance attribute not present, please update " | |
291 | "your kernel to version >=3.20"); | |
292 | return SR_ERR_NA; | |
293 | } | |
294 | ||
295 | return ret; | |
296 | } | |
297 | ||
298 | SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg, | |
299 | uint64_t *shunt) | |
300 | { | |
301 | GString *path = g_string_sized_new(64); | |
302 | gchar *contents; | |
303 | int status, ret = SR_OK; | |
304 | GError *err = NULL; | |
305 | ||
306 | status = get_shunt_path(cg, path); | |
307 | if (status != SR_OK) { | |
308 | ret = status; | |
309 | goto out; | |
310 | } | |
311 | ||
312 | status = g_file_get_contents(path->str, &contents, NULL, &err); | |
313 | if (!status) { | |
314 | sr_err("Error reading shunt resistance: %s", err->message); | |
315 | ret = SR_ERR_IO; | |
316 | goto out; | |
317 | } | |
318 | ||
319 | *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10)); | |
320 | ||
321 | out: | |
322 | g_string_free(path, TRUE); | |
323 | return ret; | |
324 | } | |
325 | ||
326 | SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt) | |
327 | { | |
328 | GString *path = g_string_sized_new(64);; | |
329 | int status, ret = SR_OK; | |
330 | FILE *fd; | |
331 | ||
332 | status = get_shunt_path(cg, path); | |
333 | if (status != SR_OK) { | |
334 | ret = status; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Can't use g_file_set_contents() here, as it calls open() with | |
340 | * O_EXEC flag in a sysfs directory thus failing with EACCES. | |
341 | */ | |
342 | fd = g_fopen(path->str, "w"); | |
343 | if (!fd) { | |
344 | sr_err("Error opening %s: %s", path->str, strerror(errno)); | |
345 | ret = SR_ERR_IO; | |
346 | goto out; | |
347 | } | |
348 | ||
349 | g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt)); | |
350 | fclose(fd); | |
351 | ||
352 | out: | |
353 | g_string_free(path, TRUE); | |
354 | return ret; | |
355 | } | |
356 | ||
357 | SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg, | |
358 | gboolean *off) | |
359 | { | |
360 | struct channel_group_priv *cgp; | |
361 | int val; | |
362 | ||
363 | cgp = cg->priv; | |
364 | ||
365 | if (!bl_acme_probe_has_pws(cg)) { | |
366 | sr_err("Probe has no power-switch"); | |
367 | return SR_ERR_ARG; | |
368 | } | |
369 | ||
370 | val = sr_gpio_getval_export(pws_gpios[cgp->index]); | |
371 | *off = val ? FALSE : TRUE; | |
372 | ||
373 | return SR_OK; | |
374 | } | |
375 | ||
376 | SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg, | |
377 | gboolean off) | |
378 | { | |
379 | struct channel_group_priv *cgp; | |
380 | int val; | |
381 | ||
382 | cgp = cg->priv; | |
383 | ||
384 | if (!bl_acme_probe_has_pws(cg)) { | |
385 | sr_err("Probe has no power-switch"); | |
386 | return SR_ERR_ARG; | |
387 | } | |
388 | ||
389 | val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1); | |
390 | ||
391 | return SR_OK; | |
392 | } | |
393 | ||
394 | static int channel_to_mq(struct sr_channel *ch) | |
395 | { | |
396 | struct channel_priv *chp; | |
397 | ||
398 | chp = ch->priv; | |
399 | ||
400 | switch (chp->ch_type) { | |
401 | case ENRG_PWR: | |
402 | return SR_MQ_POWER; | |
403 | case ENRG_CURR: | |
404 | return SR_MQ_CURRENT; | |
405 | case ENRG_VOL: | |
406 | return SR_MQ_VOLTAGE; | |
407 | case TEMP_IN: /* Fallthrough */ | |
408 | case TEMP_OUT: | |
409 | return SR_MQ_TEMPERATURE; | |
410 | default: | |
411 | return -1; | |
412 | } | |
413 | } | |
414 | ||
415 | static int channel_to_unit(struct sr_channel *ch) | |
416 | { | |
417 | struct channel_priv *chp; | |
418 | ||
419 | chp = ch->priv; | |
420 | ||
421 | switch (chp->ch_type) { | |
422 | case ENRG_PWR: | |
423 | return SR_UNIT_WATT; | |
424 | case ENRG_CURR: | |
425 | return SR_UNIT_AMPERE; | |
426 | case ENRG_VOL: | |
427 | return SR_UNIT_VOLT; | |
428 | case TEMP_IN: /* Fallthrough */ | |
429 | case TEMP_OUT: | |
430 | return SR_UNIT_CELSIUS; | |
431 | default: | |
432 | return -1; | |
433 | } | |
434 | } | |
435 | ||
436 | /* We need to scale measurements down from the units used by the drivers. */ | |
437 | static float adjust_data(int val, int type) | |
438 | { | |
439 | switch (type) { | |
440 | case ENRG_PWR: | |
441 | return ((float)val) / 1000000.0; | |
442 | case ENRG_CURR: /* Fallthrough */ | |
443 | case ENRG_VOL: /* Fallthrough */ | |
444 | case TEMP_IN: /* Fallthrough */ | |
445 | case TEMP_OUT: | |
446 | return ((float)val) / 1000.0; | |
447 | default: | |
448 | return 0.0; | |
449 | } | |
450 | } | |
451 | ||
452 | static float read_sample(struct sr_channel *ch) | |
453 | { | |
454 | struct channel_priv *chp; | |
455 | char path[64], *file, buf[16]; | |
456 | ssize_t len; | |
457 | int fd; | |
458 | ||
459 | chp = ch->priv; | |
460 | ||
461 | switch (chp->ch_type) { | |
462 | case ENRG_PWR: file = "power1_input"; break; | |
463 | case ENRG_CURR: file = "curr1_input"; break; | |
464 | case ENRG_VOL: file = "in1_input"; break; | |
465 | case TEMP_IN: file = "temp1_input"; break; | |
466 | case TEMP_OUT: file = "temp2_input"; break; | |
467 | default: | |
468 | sr_err("Invalid channel type: %d.", chp->ch_type); | |
469 | return -1.0; | |
470 | } | |
471 | ||
472 | snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s", | |
473 | chp->probe->hwmon_num, file); | |
474 | fd = open(path, O_RDONLY); | |
475 | if (fd < 0) { | |
476 | sr_err("Error opening %s: %s", path, strerror(errno)); | |
477 | ch->enabled = FALSE; | |
478 | return -1.0; | |
479 | } | |
480 | ||
481 | len = read(fd, buf, sizeof(buf)); | |
482 | close(fd); | |
483 | if (len < 0) { | |
484 | sr_err("Error reading from %s: %s", path, strerror(errno)); | |
485 | ch->enabled = FALSE; | |
486 | return -1.0; | |
487 | } | |
488 | ||
489 | return adjust_data(strtol(buf, NULL, 10), chp->ch_type); | |
490 | } | |
491 | ||
492 | SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data) | |
493 | { | |
494 | uint32_t cur_time, elapsed_time, diff_time; | |
495 | int64_t time_to_sleep; | |
496 | struct sr_datafeed_packet packet, framep; | |
497 | struct sr_datafeed_analog analog; | |
498 | struct sr_dev_inst *sdi; | |
499 | struct sr_channel *ch; | |
500 | struct dev_context *devc; | |
501 | GSList *chl, chonly; | |
502 | float valf; | |
503 | ||
504 | (void)fd; | |
505 | (void)revents; | |
506 | ||
507 | sdi = cb_data; | |
508 | if (!sdi) | |
509 | return TRUE; | |
510 | ||
511 | devc = sdi->priv; | |
512 | if (!devc) | |
513 | return TRUE; | |
514 | ||
515 | packet.type = SR_DF_ANALOG; | |
516 | packet.payload = &analog; | |
517 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); | |
518 | analog.data = &valf; | |
519 | ||
520 | /* | |
521 | * Reading from sysfs takes some time - try to keep up with samplerate. | |
522 | */ | |
523 | if (devc->samples_read) { | |
524 | cur_time = g_get_monotonic_time(); | |
525 | diff_time = cur_time - devc->last_sample_fin; | |
526 | time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time; | |
527 | if (time_to_sleep > 0) | |
528 | g_usleep(time_to_sleep); | |
529 | } | |
530 | ||
531 | framep.type = SR_DF_FRAME_BEGIN; | |
532 | sr_session_send(cb_data, &framep); | |
533 | ||
534 | /* | |
535 | * Due to different units used in each channel we're sending | |
536 | * samples one-by-one. | |
537 | */ | |
538 | for (chl = sdi->channels; chl; chl = chl->next) { | |
539 | ch = chl->data; | |
540 | if (!ch->enabled) | |
541 | continue; | |
542 | chonly.next = NULL; | |
543 | chonly.data = ch; | |
544 | analog.channels = &chonly; | |
545 | analog.num_samples = 1; | |
546 | analog.mq = channel_to_mq(chl->data); | |
547 | analog.unit = channel_to_unit(ch); | |
548 | ||
549 | valf = read_sample(ch); | |
550 | ||
551 | sr_session_send(cb_data, &packet); | |
552 | } | |
553 | ||
554 | framep.type = SR_DF_FRAME_END; | |
555 | sr_session_send(cb_data, &framep); | |
556 | ||
557 | devc->samples_read++; | |
558 | if (devc->limit_samples > 0 && | |
559 | devc->samples_read >= devc->limit_samples) { | |
560 | sr_info("Requested number of samples reached."); | |
561 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
562 | devc->last_sample_fin = g_get_monotonic_time(); | |
563 | return TRUE; | |
564 | } else if (devc->limit_msec > 0) { | |
565 | cur_time = g_get_monotonic_time(); | |
566 | elapsed_time = cur_time - devc->start_time; | |
567 | ||
568 | if (elapsed_time >= devc->limit_msec) { | |
569 | sr_info("Sampling time limit reached."); | |
570 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
571 | devc->last_sample_fin = g_get_monotonic_time(); | |
572 | return TRUE; | |
573 | } | |
574 | } | |
575 | ||
576 | devc->last_sample_fin = g_get_monotonic_time(); | |
577 | return TRUE; | |
578 | } |