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>
29 struct channel_group_priv {
39 struct channel_group_priv *probe;
42 static const uint8_t enrg_i2c_addrs[] = {
43 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
46 static const uint8_t temp_i2c_addrs[] = {
47 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
50 static const uint32_t pws_gpios[] = {
51 486, 498, 502, 482, 478, 506, 510, 474,
54 static const uint32_t pws_info_gpios[] = {
55 487, 499, 503, 483, 479, 507, 511, 475,
58 #define MOHM_TO_UOHM(x) ((x) * 1000)
59 #define UOHM_TO_MOHM(x) ((x) / 1000)
61 SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
63 return enrg_i2c_addrs[index];
66 SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
68 return temp_i2c_addrs[index];
71 SR_PRIV gboolean bl_acme_is_sane(void)
76 * We expect sysfs to be present and mounted at /sys, ina226 and
77 * tmp435 sensors detected by the system and their appropriate
78 * drivers loaded and functional.
80 status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
82 sr_err("/sys/ directory not found - sysfs not mounted?");
89 static void probe_name_path(unsigned int addr, GString *path)
92 "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
96 * For given address fill buf with the path to appropriate hwmon entry.
98 static void probe_hwmon_path(unsigned int addr, GString *path)
100 g_string_printf(path,
101 "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
104 SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
105 int prb_num, const char *prb_name)
107 gboolean ret = FALSE, status;
109 GString *path = g_string_sized_new(64);
113 probe_name_path(addr, path);
114 status = g_file_get_contents(path->str, &buf, &size, &err);
116 sr_dbg("Name for probe %d can't be read: %s",
117 prb_num, err->message);
118 g_string_free(path, TRUE);
122 if (!strncmp(buf, prb_name, strlen(prb_name))) {
124 * Correct driver registered on this address - but is
125 * there an actual probe connected?
127 probe_hwmon_path(addr, path);
128 status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
130 /* We have found an ACME probe. */
136 g_string_free(path, TRUE);
141 static int get_hwmon_index(unsigned int addr)
144 GString *path = g_string_sized_new(64);
148 probe_hwmon_path(addr, path);
149 dir = g_dir_open(path->str, 0, &err);
151 sr_err("Error opening %s: %s", path->str, err->message);
152 g_string_free(path, TRUE);
156 g_string_free(path, TRUE);
159 * The directory should contain a single file named hwmonX where X
160 * is the hwmon index.
162 status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
165 sr_err("Unable to determine the hwmon entry");
172 static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
175 struct channel_priv *cp;
176 struct dev_context *devc;
177 struct sr_channel *ch;
184 name = g_strdup_printf("P%d_ENRG_PWR", index);
187 name = g_strdup_printf("P%d_ENRG_CURR", index);
190 name = g_strdup_printf("P%d_ENRG_VOL", index);
193 name = g_strdup_printf("P%d_TEMP_IN", index);
196 name = g_strdup_printf("P%d_TEMP_OUT", index);
199 sr_err("Invalid channel type: %d.", type);
203 cp = g_malloc0(sizeof(struct channel_priv));
205 cp->probe = cg->priv;
207 ch = sr_channel_new(sdi, devc->num_channels++,
208 SR_CHANNEL_ANALOG, TRUE, name);
212 cg->channels = g_slist_append(cg->channels, ch);
215 SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
216 unsigned int addr, int prb_num)
218 struct sr_channel_group *cg;
219 struct channel_group_priv *cgp;
222 /* Obtain the hwmon index. */
223 hwmon = get_hwmon_index(addr);
227 cg = g_malloc0(sizeof(struct sr_channel_group));
228 cgp = g_malloc0(sizeof(struct channel_group_priv));
229 cgp->hwmon_num = hwmon;
230 cgp->probe_type = type;
231 cgp->index = prb_num - 1;
232 cg->name = g_strdup_printf("Probe_%d", prb_num);
235 if (type == PROBE_ENRG) {
236 append_channel(sdi, cg, prb_num, ENRG_PWR);
237 append_channel(sdi, cg, prb_num, ENRG_CURR);
238 append_channel(sdi, cg, prb_num, ENRG_VOL);
239 } else if (type == PROBE_TEMP) {
240 append_channel(sdi, cg, prb_num, TEMP_IN);
241 append_channel(sdi, cg, prb_num, TEMP_OUT);
243 sr_err("Invalid probe type: %d.", type);
246 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
251 SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg)
253 struct channel_group_priv *cgp = cg->priv;
255 return cgp->probe_type;
258 SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg)
260 struct channel_group_priv *cgp = cg->priv;
262 return sr_gpio_getval_export(pws_info_gpios[cgp->index]);
266 * Sets path to the hwmon attribute if this channel group
267 * supports shunt resistance setting. The caller has to supply
270 static int get_shunt_path(const struct sr_channel_group *cg, GString *path)
272 struct channel_group_priv *cgp;
273 int ret = SR_OK, status;
277 if (cgp->probe_type != PROBE_ENRG) {
278 sr_err("Probe doesn't support shunt resistance setting");
282 g_string_append_printf(path,
283 "/sys/class/hwmon/hwmon%d/shunt_resistor",
287 * The shunt_resistor sysfs attribute is available
288 * in the Linux kernel since version 3.20. We have
289 * to notify the user if this attribute is not present.
291 status = g_file_test(path->str, G_FILE_TEST_EXISTS);
293 sr_err("shunt_resistance attribute not present, please update "
294 "your kernel to version >=3.20");
302 * Try setting the update_interval sysfs attribute for each probe according
305 SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
308 struct sr_channel_group *cg;
309 struct channel_group_priv *cgp;
314 for (l = sdi->channel_groups; l != NULL; l = l->next) {
318 hwmon = g_string_sized_new(64);
319 g_string_append_printf(hwmon,
320 "/sys/class/hwmon/hwmon%d/update_interval",
323 if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) {
324 fd = g_fopen(hwmon->str, "w");
326 g_string_free(hwmon, TRUE);
330 g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate);
334 g_string_free(hwmon, TRUE);
338 SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
341 GString *path = g_string_sized_new(64);
343 int status, ret = SR_OK;
346 status = get_shunt_path(cg, path);
347 if (status != SR_OK) {
352 status = g_file_get_contents(path->str, &contents, NULL, &err);
354 sr_err("Error reading shunt resistance: %s", err->message);
359 *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
362 g_string_free(path, TRUE);
366 SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
368 GString *path = g_string_sized_new(64);;
369 int status, ret = SR_OK;
372 status = get_shunt_path(cg, path);
373 if (status != SR_OK) {
379 * Can't use g_file_set_contents() here, as it calls open() with
380 * O_EXEC flag in a sysfs directory thus failing with EACCES.
382 fd = g_fopen(path->str, "w");
384 sr_err("Error opening %s: %s", path->str, g_strerror(errno));
389 g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
393 g_string_free(path, TRUE);
397 SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
400 struct channel_group_priv *cgp;
405 if (!bl_acme_probe_has_pws(cg)) {
406 sr_err("Probe has no power-switch");
410 val = sr_gpio_getval_export(pws_gpios[cgp->index]);
411 *off = val ? FALSE : TRUE;
416 SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
419 struct channel_group_priv *cgp;
424 if (!bl_acme_probe_has_pws(cg)) {
425 sr_err("Probe has no power-switch");
429 val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
431 sr_err("Error setting power-off state: gpio: %d",
432 pws_gpios[cgp->index]);
439 static int channel_to_mq(struct sr_channel *ch)
441 struct channel_priv *chp;
445 switch (chp->ch_type) {
449 return SR_MQ_CURRENT;
451 return SR_MQ_VOLTAGE;
452 case TEMP_IN: /* Fallthrough */
454 return SR_MQ_TEMPERATURE;
460 static int channel_to_unit(struct sr_channel *ch)
462 struct channel_priv *chp;
466 switch (chp->ch_type) {
470 return SR_UNIT_AMPERE;
473 case TEMP_IN: /* Fallthrough */
475 return SR_UNIT_CELSIUS;
481 /* We need to scale measurements down from the units used by the drivers. */
482 static float adjust_data(int val, int type)
486 return ((float)val) / 1000000.0;
487 case ENRG_CURR: /* Fallthrough */
488 case ENRG_VOL: /* Fallthrough */
489 case TEMP_IN: /* Fallthrough */
491 return ((float)val) / 1000.0;
497 static float read_sample(struct sr_channel *ch)
499 struct channel_priv *chp;
507 lseek(fd, 0, SEEK_SET);
509 len = read(fd, buf, sizeof(buf));
511 sr_err("Error reading from channel %s (hwmon: %d): %s",
512 ch->name, chp->probe->hwmon_num, g_strerror(errno));
517 return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
520 SR_PRIV int bl_acme_open_channel(struct sr_channel *ch)
522 struct channel_priv *chp;
523 char path[64], *file;
528 switch (chp->ch_type) {
529 case ENRG_PWR: file = "power1_input"; break;
530 case ENRG_CURR: file = "curr1_input"; break;
531 case ENRG_VOL: file = "in1_input"; break;
532 case TEMP_IN: file = "temp1_input"; break;
533 case TEMP_OUT: file = "temp2_input"; break;
535 sr_err("Invalid channel type: %d.", chp->ch_type);
539 snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
540 chp->probe->hwmon_num, file);
542 fd = open(path, O_RDONLY);
544 sr_err("Error opening %s: %s", path, g_strerror(errno));
554 SR_PRIV void bl_acme_close_channel(struct sr_channel *ch)
556 struct channel_priv *chp;
563 SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
565 uint32_t cur_time, elapsed_time;
566 uint64_t nrexpiration;
567 struct sr_datafeed_packet packet, framep;
568 struct sr_datafeed_analog analog;
569 struct sr_dev_inst *sdi;
570 struct sr_channel *ch;
571 struct channel_priv *chp;
572 struct dev_context *devc;
587 packet.type = SR_DF_ANALOG;
588 packet.payload = &analog;
589 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
591 if (read(devc->timer_fd, &nrexpiration, sizeof(nrexpiration)) < 0) {
592 sr_warn("Failed to read timer information");
597 * We were not able to process the previous timer expiration, we are
600 if (nrexpiration > 1)
601 devc->samples_missed += nrexpiration - 1;
604 * XXX This is a nasty workaround...
606 * At high sampling rates and maximum channels we are not able to
607 * acquire samples fast enough, even though frontends still think
608 * that samples arrive on time. This causes shifts in frontend
611 * To compensate for the delay we check if any clock events were
612 * missed and - if so - don't really read the next value, but send
613 * the same sample as fast as possible. We do it until we are back
616 * At high sampling rate this doesn't seem to visibly reduce the
619 for (i = 0; i < nrexpiration; i++) {
620 framep.type = SR_DF_FRAME_BEGIN;
621 sr_session_send(cb_data, &framep);
624 * Due to different units used in each channel we're sending
625 * samples one-by-one.
627 for (chl = sdi->channels; chl; chl = chl->next) {
635 analog.channels = &chonly;
636 analog.num_samples = 1;
637 analog.mq = channel_to_mq(chl->data);
638 analog.unit = channel_to_unit(ch);
641 chp->val = read_sample(ch);
643 analog.data = &chp->val;
644 sr_session_send(cb_data, &packet);
647 framep.type = SR_DF_FRAME_END;
648 sr_session_send(cb_data, &framep);
651 devc->samples_read++;
652 if (devc->limit_samples > 0 &&
653 devc->samples_read >= devc->limit_samples) {
654 sr_info("Requested number of samples reached.");
655 sdi->driver->dev_acquisition_stop(sdi, cb_data);
656 devc->last_sample_fin = g_get_monotonic_time();
658 } else if (devc->limit_msec > 0) {
659 cur_time = g_get_monotonic_time();
660 elapsed_time = cur_time - devc->start_time;
662 if (elapsed_time >= devc->limit_msec) {
663 sr_info("Sampling time limit reached.");
664 sdi->driver->dev_acquisition_stop(sdi, cb_data);
665 devc->last_sample_fin = g_get_monotonic_time();
670 devc->last_sample_fin = g_get_monotonic_time();