2 * This file is part of the libsigrok project.
4 * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.com>
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.
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.
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/>.
25 #include <glib/gstdio.h>
37 struct channel_group_priv {
48 struct channel_group_priv *probe;
51 static const uint8_t enrg_i2c_addrs[] = {
52 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
55 static const uint8_t temp_i2c_addrs[] = {
56 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
59 static const uint32_t pws_gpios[] = {
60 486, 498, 502, 482, 478, 506, 510, 474,
63 static const uint32_t pws_info_gpios[] = {
64 487, 499, 503, 483, 479, 507, 511, 475,
67 #define MOHM_TO_UOHM(x) ((x) * 1000)
68 #define UOHM_TO_MOHM(x) ((x) / 1000)
70 SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
72 return enrg_i2c_addrs[index];
75 SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
77 return temp_i2c_addrs[index];
80 SR_PRIV gboolean bl_acme_is_sane(void)
85 * We expect sysfs to be present and mounted at /sys, ina226 and
86 * tmp435 sensors detected by the system and their appropriate
87 * drivers loaded and functional.
89 status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
91 sr_err("/sys/ directory not found - sysfs not mounted?");
98 static void probe_name_path(unsigned int addr, GString *path)
100 g_string_printf(path,
101 "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
105 * For given address fill buf with the path to appropriate hwmon entry.
107 static void probe_hwmon_path(unsigned int addr, GString *path)
109 g_string_printf(path,
110 "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
113 SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
114 int prb_num, const char *prb_name)
116 gboolean ret = FALSE, status;
118 GString *path = g_string_sized_new(64);
122 probe_name_path(addr, path);
123 status = g_file_get_contents(path->str, &buf, &size, &err);
125 sr_dbg("Name for probe %d can't be read: %s",
126 prb_num, err->message);
127 g_string_free(path, TRUE);
131 if (!strncmp(buf, prb_name, strlen(prb_name))) {
133 * Correct driver registered on this address - but is
134 * there an actual probe connected?
136 probe_hwmon_path(addr, path);
137 status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
139 /* We have found an ACME probe. */
145 g_string_free(path, TRUE);
150 static int get_hwmon_index(unsigned int addr)
153 GString *path = g_string_sized_new(64);
157 probe_hwmon_path(addr, path);
158 dir = g_dir_open(path->str, 0, &err);
160 sr_err("Error opening %s: %s", path->str, err->message);
161 g_string_free(path, TRUE);
165 g_string_free(path, TRUE);
168 * The directory should contain a single file named hwmonX where X
169 * is the hwmon index.
171 status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
174 sr_err("Unable to determine the hwmon entry");
181 static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
184 struct channel_priv *cp;
185 struct dev_context *devc;
186 struct sr_channel *ch;
193 name = g_strdup_printf("P%d_ENRG_PWR", index);
196 name = g_strdup_printf("P%d_ENRG_CURR", index);
199 name = g_strdup_printf("P%d_ENRG_VOL", index);
202 name = g_strdup_printf("P%d_TEMP_IN", index);
205 name = g_strdup_printf("P%d_TEMP_OUT", index);
208 sr_err("Invalid channel type: %d.", type);
212 cp = g_malloc0(sizeof(struct channel_priv));
214 cp->probe = cg->priv;
216 ch = sr_channel_new(sdi, devc->num_channels++,
217 SR_CHANNEL_ANALOG, TRUE, name);
221 cg->channels = g_slist_append(cg->channels, ch);
224 SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
225 unsigned int addr, int prb_num)
227 struct sr_channel_group *cg;
228 struct channel_group_priv *cgp;
231 /* Obtain the hwmon index. */
232 hwmon = get_hwmon_index(addr);
236 cg = g_malloc0(sizeof(struct sr_channel_group));
237 cgp = g_malloc0(sizeof(struct channel_group_priv));
238 cgp->hwmon_num = hwmon;
239 cgp->probe_type = type;
240 cgp->index = prb_num - 1;
241 cgp->has_pws = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
242 cg->name = g_strdup_printf("Probe_%d", prb_num);
245 if (type == PROBE_ENRG) {
246 append_channel(sdi, cg, prb_num, ENRG_PWR);
247 append_channel(sdi, cg, prb_num, ENRG_CURR);
248 append_channel(sdi, cg, prb_num, ENRG_VOL);
249 } else if (type == PROBE_TEMP) {
250 append_channel(sdi, cg, prb_num, TEMP_IN);
251 append_channel(sdi, cg, prb_num, TEMP_OUT);
253 sr_err("Invalid probe type: %d.", type);
256 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
261 SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg)
263 struct channel_group_priv *cgp = cg->priv;
265 return cgp->probe_type;
268 SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg)
270 struct channel_group_priv *cgp = cg->priv;
276 * Sets path to the hwmon attribute if this channel group
277 * supports shunt resistance setting. The caller has to supply
280 static int get_shunt_path(const struct sr_channel_group *cg, GString *path)
282 struct channel_group_priv *cgp;
283 int ret = SR_OK, status;
287 if (cgp->probe_type != PROBE_ENRG) {
288 sr_err("Probe doesn't support shunt resistance setting");
292 g_string_append_printf(path,
293 "/sys/class/hwmon/hwmon%d/shunt_resistor",
297 * The shunt_resistor sysfs attribute is available
298 * in the Linux kernel since version 3.20. We have
299 * to notify the user if this attribute is not present.
301 status = g_file_test(path->str, G_FILE_TEST_EXISTS);
303 sr_err("shunt_resistance attribute not present, please update "
304 "your kernel to version >=3.20");
312 * Try setting the update_interval sysfs attribute for each probe according
315 SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
318 struct sr_channel_group *cg;
319 struct channel_group_priv *cgp;
324 for (l = sdi->channel_groups; l != NULL; l = l->next) {
328 hwmon = g_string_sized_new(64);
329 g_string_append_printf(hwmon,
330 "/sys/class/hwmon/hwmon%d/update_interval",
333 if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) {
334 fd = g_fopen(hwmon->str, "w");
336 g_string_free(hwmon, TRUE);
340 g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate);
344 g_string_free(hwmon, TRUE);
348 SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
351 GString *path = g_string_sized_new(64);
353 int status, ret = SR_OK;
356 status = get_shunt_path(cg, path);
357 if (status != SR_OK) {
362 status = g_file_get_contents(path->str, &contents, NULL, &err);
364 sr_err("Error reading shunt resistance: %s", err->message);
369 *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
372 g_string_free(path, TRUE);
376 SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
378 GString *path = g_string_sized_new(64);;
379 int status, ret = SR_OK;
382 status = get_shunt_path(cg, path);
383 if (status != SR_OK) {
389 * Can't use g_file_set_contents() here, as it calls open() with
390 * O_EXEC flag in a sysfs directory thus failing with EACCES.
392 fd = g_fopen(path->str, "w");
394 sr_err("Error opening %s: %s", path->str, g_strerror(errno));
399 g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
403 g_string_free(path, TRUE);
407 SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
410 struct channel_group_priv *cgp;
415 if (!bl_acme_probe_has_pws(cg)) {
416 sr_err("Probe has no power-switch");
420 val = sr_gpio_getval_export(pws_gpios[cgp->index]);
421 *off = val ? FALSE : TRUE;
426 SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
429 struct channel_group_priv *cgp;
434 if (!bl_acme_probe_has_pws(cg)) {
435 sr_err("Probe has no power-switch");
439 val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
441 sr_err("Error setting power-off state: gpio: %d",
442 pws_gpios[cgp->index]);
449 static int channel_to_mq(struct sr_channel *ch)
451 struct channel_priv *chp;
455 switch (chp->ch_type) {
459 return SR_MQ_CURRENT;
461 return SR_MQ_VOLTAGE;
462 case TEMP_IN: /* Fallthrough */
464 return SR_MQ_TEMPERATURE;
470 static int channel_to_unit(struct sr_channel *ch)
472 struct channel_priv *chp;
476 switch (chp->ch_type) {
480 return SR_UNIT_AMPERE;
483 case TEMP_IN: /* Fallthrough */
485 return SR_UNIT_CELSIUS;
491 /* We need to scale measurements down from the units used by the drivers. */
492 static float adjust_data(int val, int type)
496 return ((float)val) / 1000000.0;
497 case ENRG_CURR: /* Fallthrough */
498 case ENRG_VOL: /* Fallthrough */
499 case TEMP_IN: /* Fallthrough */
501 return ((float)val) / 1000.0;
507 static float read_sample(struct sr_channel *ch)
509 struct channel_priv *chp;
517 lseek(fd, 0, SEEK_SET);
519 len = read(fd, buf, sizeof(buf));
521 sr_err("Error reading from channel %s (hwmon: %d): %s",
522 ch->name, chp->probe->hwmon_num, g_strerror(errno));
527 return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
530 SR_PRIV int bl_acme_open_channel(struct sr_channel *ch)
532 struct channel_priv *chp;
533 char path[64], *file;
538 switch (chp->ch_type) {
539 case ENRG_PWR: file = "power1_input"; break;
540 case ENRG_CURR: file = "curr1_input"; break;
541 case ENRG_VOL: file = "in1_input"; break;
542 case TEMP_IN: file = "temp1_input"; break;
543 case TEMP_OUT: file = "temp2_input"; break;
545 sr_err("Invalid channel type: %d.", chp->ch_type);
549 snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
550 chp->probe->hwmon_num, file);
552 fd = open(path, O_RDONLY);
554 sr_err("Error opening %s: %s", path, g_strerror(errno));
564 SR_PRIV void bl_acme_close_channel(struct sr_channel *ch)
566 struct channel_priv *chp;
573 SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
575 uint32_t cur_time, elapsed_time;
576 uint64_t nrexpiration;
577 struct sr_datafeed_packet packet, framep;
578 struct sr_datafeed_analog analog;
579 struct sr_dev_inst *sdi;
580 struct sr_channel *ch;
581 struct channel_priv *chp;
582 struct dev_context *devc;
597 packet.type = SR_DF_ANALOG;
598 packet.payload = &analog;
599 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
601 if (read(devc->timer_fd, &nrexpiration, sizeof(nrexpiration)) < 0) {
602 sr_warn("Failed to read timer information");
607 * We were not able to process the previous timer expiration, we are
610 if (nrexpiration > 1)
611 devc->samples_missed += nrexpiration - 1;
614 * XXX This is a nasty workaround...
616 * At high sampling rates and maximum channels we are not able to
617 * acquire samples fast enough, even though frontends still think
618 * that samples arrive on time. This causes shifts in frontend
621 * To compensate for the delay we check if any clock events were
622 * missed and - if so - don't really read the next value, but send
623 * the same sample as fast as possible. We do it until we are back
626 * At high sampling rate this doesn't seem to visibly reduce the
629 for (i = 0; i < nrexpiration; i++) {
630 framep.type = SR_DF_FRAME_BEGIN;
631 sr_session_send(cb_data, &framep);
634 * Due to different units used in each channel we're sending
635 * samples one-by-one.
637 for (chl = sdi->channels; chl; chl = chl->next) {
645 analog.channels = &chonly;
646 analog.num_samples = 1;
647 analog.mq = channel_to_mq(chl->data);
648 analog.unit = channel_to_unit(ch);
651 chp->val = read_sample(ch);
653 analog.data = &chp->val;
654 sr_session_send(cb_data, &packet);
657 framep.type = SR_DF_FRAME_END;
658 sr_session_send(cb_data, &framep);
661 devc->samples_read++;
662 if (devc->limit_samples > 0 &&
663 devc->samples_read >= devc->limit_samples) {
664 sr_info("Requested number of samples reached.");
665 sdi->driver->dev_acquisition_stop(sdi, cb_data);
666 devc->last_sample_fin = g_get_monotonic_time();
668 } else if (devc->limit_msec > 0) {
669 cur_time = g_get_monotonic_time();
670 elapsed_time = cur_time - devc->start_time;
672 if (elapsed_time >= devc->limit_msec) {
673 sr_info("Sampling time limit reached.");
674 sdi->driver->dev_acquisition_stop(sdi, cb_data);
675 devc->last_sample_fin = g_get_monotonic_time();
680 devc->last_sample_fin = g_get_monotonic_time();