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 {
47 struct channel_group_priv *probe;
50 static const uint8_t enrg_i2c_addrs[] = {
51 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
54 static const uint8_t temp_i2c_addrs[] = {
55 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
58 static const uint32_t pws_gpios[] = {
59 486, 498, 502, 482, 478, 506, 510, 474,
62 static const uint32_t pws_info_gpios[] = {
63 487, 499, 503, 483, 479, 507, 511, 475,
66 #define MOHM_TO_UOHM(x) ((x) * 1000)
67 #define UOHM_TO_MOHM(x) ((x) / 1000)
69 SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
71 return enrg_i2c_addrs[index];
74 SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
76 return temp_i2c_addrs[index];
79 SR_PRIV gboolean bl_acme_is_sane(void)
84 * We expect sysfs to be present and mounted at /sys, ina226 and
85 * tmp435 sensors detected by the system and their appropriate
86 * drivers loaded and functional.
88 status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
90 sr_err("/sys/ directory not found - sysfs not mounted?");
97 static void probe_name_path(unsigned int addr, GString *path)
100 "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
104 * For given address fill buf with the path to appropriate hwmon entry.
106 static void probe_hwmon_path(unsigned int addr, GString *path)
108 g_string_printf(path,
109 "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
112 SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
113 int prb_num, const char *prb_name)
115 gboolean ret = FALSE, status;
117 GString *path = g_string_sized_new(64);
121 probe_name_path(addr, path);
122 status = g_file_get_contents(path->str, &buf, &size, &err);
124 sr_dbg("Name for probe %d can't be read: %s",
125 prb_num, err->message);
126 g_string_free(path, TRUE);
130 if (!strncmp(buf, prb_name, strlen(prb_name))) {
132 * Correct driver registered on this address - but is
133 * there an actual probe connected?
135 probe_hwmon_path(addr, path);
136 status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
138 /* We have found an ACME probe. */
144 g_string_free(path, TRUE);
149 static int get_hwmon_index(unsigned int addr)
152 GString *path = g_string_sized_new(64);
156 probe_hwmon_path(addr, path);
157 dir = g_dir_open(path->str, 0, &err);
159 sr_err("Error opening %s: %s", path->str, err->message);
160 g_string_free(path, TRUE);
164 g_string_free(path, TRUE);
167 * The directory should contain a single file named hwmonX where X
168 * is the hwmon index.
170 status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
173 sr_err("Unable to determine the hwmon entry");
180 static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
183 struct channel_priv *cp;
184 struct dev_context *devc;
185 struct sr_channel *ch;
192 name = g_strdup_printf("P%d_ENRG_PWR", index);
195 name = g_strdup_printf("P%d_ENRG_CURR", index);
198 name = g_strdup_printf("P%d_ENRG_VOL", index);
201 name = g_strdup_printf("P%d_TEMP_IN", index);
204 name = g_strdup_printf("P%d_TEMP_OUT", index);
207 sr_err("Invalid channel type: %d.", type);
211 cp = g_malloc0(sizeof(struct channel_priv));
213 cp->probe = cg->priv;
215 ch = sr_channel_new(sdi, devc->num_channels++,
216 SR_CHANNEL_ANALOG, TRUE, name);
220 cg->channels = g_slist_append(cg->channels, ch);
223 SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
224 unsigned int addr, int prb_num)
226 struct sr_channel_group *cg;
227 struct channel_group_priv *cgp;
230 /* Obtain the hwmon index. */
231 hwmon = get_hwmon_index(addr);
235 cg = g_malloc0(sizeof(struct sr_channel_group));
236 cgp = g_malloc0(sizeof(struct channel_group_priv));
237 cgp->hwmon_num = hwmon;
238 cgp->probe_type = type;
239 cgp->index = prb_num - 1;
240 cg->name = g_strdup_printf("Probe_%d", prb_num);
243 if (type == PROBE_ENRG) {
244 append_channel(sdi, cg, prb_num, ENRG_PWR);
245 append_channel(sdi, cg, prb_num, ENRG_CURR);
246 append_channel(sdi, cg, prb_num, ENRG_VOL);
247 } else if (type == PROBE_TEMP) {
248 append_channel(sdi, cg, prb_num, TEMP_IN);
249 append_channel(sdi, cg, prb_num, TEMP_OUT);
251 sr_err("Invalid probe type: %d.", type);
254 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
259 SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg)
261 struct channel_group_priv *cgp = cg->priv;
263 return cgp->probe_type;
266 SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg)
268 struct channel_group_priv *cgp = cg->priv;
270 return sr_gpio_getval_export(pws_info_gpios[cgp->index]);
274 * Sets path to the hwmon attribute if this channel group
275 * supports shunt resistance setting. The caller has to supply
278 static int get_shunt_path(const struct sr_channel_group *cg, GString *path)
280 struct channel_group_priv *cgp;
281 int ret = SR_OK, status;
285 if (cgp->probe_type != PROBE_ENRG) {
286 sr_err("Probe doesn't support shunt resistance setting");
290 g_string_append_printf(path,
291 "/sys/class/hwmon/hwmon%d/shunt_resistor",
295 * The shunt_resistor sysfs attribute is available
296 * in the Linux kernel since version 3.20. We have
297 * to notify the user if this attribute is not present.
299 status = g_file_test(path->str, G_FILE_TEST_EXISTS);
301 sr_err("shunt_resistance attribute not present, please update "
302 "your kernel to version >=3.20");
310 * Try setting the update_interval sysfs attribute for each probe according
313 SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
316 struct sr_channel_group *cg;
317 struct channel_group_priv *cgp;
322 for (l = sdi->channel_groups; l != NULL; l = l->next) {
326 hwmon = g_string_sized_new(64);
327 g_string_append_printf(hwmon,
328 "/sys/class/hwmon/hwmon%d/update_interval",
331 if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) {
332 fd = g_fopen(hwmon->str, "w");
334 g_string_free(hwmon, TRUE);
338 g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate);
342 g_string_free(hwmon, TRUE);
346 SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
349 GString *path = g_string_sized_new(64);
351 int status, ret = SR_OK;
354 status = get_shunt_path(cg, path);
355 if (status != SR_OK) {
360 status = g_file_get_contents(path->str, &contents, NULL, &err);
362 sr_err("Error reading shunt resistance: %s", err->message);
367 *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
370 g_string_free(path, TRUE);
374 SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
376 GString *path = g_string_sized_new(64);;
377 int status, ret = SR_OK;
380 status = get_shunt_path(cg, path);
381 if (status != SR_OK) {
387 * Can't use g_file_set_contents() here, as it calls open() with
388 * O_EXEC flag in a sysfs directory thus failing with EACCES.
390 fd = g_fopen(path->str, "w");
392 sr_err("Error opening %s: %s", path->str, g_strerror(errno));
397 g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
401 g_string_free(path, TRUE);
405 SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
408 struct channel_group_priv *cgp;
413 if (!bl_acme_probe_has_pws(cg)) {
414 sr_err("Probe has no power-switch");
418 val = sr_gpio_getval_export(pws_gpios[cgp->index]);
419 *off = val ? FALSE : TRUE;
424 SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
427 struct channel_group_priv *cgp;
432 if (!bl_acme_probe_has_pws(cg)) {
433 sr_err("Probe has no power-switch");
437 val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
439 sr_err("Error setting power-off state: gpio: %d",
440 pws_gpios[cgp->index]);
447 static int channel_to_mq(struct sr_channel *ch)
449 struct channel_priv *chp;
453 switch (chp->ch_type) {
457 return SR_MQ_CURRENT;
459 return SR_MQ_VOLTAGE;
460 case TEMP_IN: /* Fallthrough */
462 return SR_MQ_TEMPERATURE;
468 static int channel_to_unit(struct sr_channel *ch)
470 struct channel_priv *chp;
474 switch (chp->ch_type) {
478 return SR_UNIT_AMPERE;
481 case TEMP_IN: /* Fallthrough */
483 return SR_UNIT_CELSIUS;
489 /* We need to scale measurements down from the units used by the drivers. */
490 static float adjust_data(int val, int type)
494 return ((float)val) / 1000000.0;
495 case ENRG_CURR: /* Fallthrough */
496 case ENRG_VOL: /* Fallthrough */
497 case TEMP_IN: /* Fallthrough */
499 return ((float)val) / 1000.0;
505 static float read_sample(struct sr_channel *ch)
507 struct channel_priv *chp;
515 lseek(fd, 0, SEEK_SET);
517 len = read(fd, buf, sizeof(buf));
519 sr_err("Error reading from channel %s (hwmon: %d): %s",
520 ch->name, chp->probe->hwmon_num, g_strerror(errno));
525 return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
528 SR_PRIV int bl_acme_open_channel(struct sr_channel *ch)
530 struct channel_priv *chp;
531 char path[64], *file;
536 switch (chp->ch_type) {
537 case ENRG_PWR: file = "power1_input"; break;
538 case ENRG_CURR: file = "curr1_input"; break;
539 case ENRG_VOL: file = "in1_input"; break;
540 case TEMP_IN: file = "temp1_input"; break;
541 case TEMP_OUT: file = "temp2_input"; break;
543 sr_err("Invalid channel type: %d.", chp->ch_type);
547 snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
548 chp->probe->hwmon_num, file);
550 fd = open(path, O_RDONLY);
552 sr_err("Error opening %s: %s", path, g_strerror(errno));
562 SR_PRIV void bl_acme_close_channel(struct sr_channel *ch)
564 struct channel_priv *chp;
571 SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
573 uint32_t cur_time, elapsed_time;
574 uint64_t nrexpiration;
575 struct sr_datafeed_packet packet, framep;
576 struct sr_datafeed_analog analog;
577 struct sr_dev_inst *sdi;
578 struct sr_channel *ch;
579 struct channel_priv *chp;
580 struct dev_context *devc;
595 packet.type = SR_DF_ANALOG;
596 packet.payload = &analog;
597 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
599 if (read(devc->timer_fd, &nrexpiration, sizeof(nrexpiration)) < 0) {
600 sr_warn("Failed to read timer information");
605 * We were not able to process the previous timer expiration, we are
608 if (nrexpiration > 1)
609 devc->samples_missed += nrexpiration - 1;
612 * XXX This is a nasty workaround...
614 * At high sampling rates and maximum channels we are not able to
615 * acquire samples fast enough, even though frontends still think
616 * that samples arrive on time. This causes shifts in frontend
619 * To compensate for the delay we check if any clock events were
620 * missed and - if so - don't really read the next value, but send
621 * the same sample as fast as possible. We do it until we are back
624 * At high sampling rate this doesn't seem to visibly reduce the
627 for (i = 0; i < nrexpiration; i++) {
628 framep.type = SR_DF_FRAME_BEGIN;
629 sr_session_send(cb_data, &framep);
632 * Due to different units used in each channel we're sending
633 * samples one-by-one.
635 for (chl = sdi->channels; chl; chl = chl->next) {
643 analog.channels = &chonly;
644 analog.num_samples = 1;
645 analog.mq = channel_to_mq(chl->data);
646 analog.unit = channel_to_unit(ch);
649 chp->val = read_sample(ch);
651 analog.data = &chp->val;
652 sr_session_send(cb_data, &packet);
655 framep.type = SR_DF_FRAME_END;
656 sr_session_send(cb_data, &framep);
659 devc->samples_read++;
660 if (devc->limit_samples > 0 &&
661 devc->samples_read >= devc->limit_samples) {
662 sr_info("Requested number of samples reached.");
663 sdi->driver->dev_acquisition_stop(sdi, cb_data);
664 devc->last_sample_fin = g_get_monotonic_time();
666 } else if (devc->limit_msec > 0) {
667 cur_time = g_get_monotonic_time();
668 elapsed_time = cur_time - devc->start_time;
670 if (elapsed_time >= devc->limit_msec) {
671 sr_info("Sampling time limit reached.");
672 sdi->driver->dev_acquisition_stop(sdi, cb_data);
673 devc->last_sample_fin = g_get_monotonic_time();
678 devc->last_sample_fin = g_get_monotonic_time();