Both ina2xx and tmp401 linux drivers used by baylibre-acme expose
the standard hwmon update_interval attribute, which affects the internal
update interval of the chip.
When setting samplerate for data acquisition try to modify this attribute
accordingly.
Signed-off-by: Bartosz Golaszewski <bgolaszew...@baylibre.com>
---
src/hardware/baylibre-acme/api.c | 1 +
src/hardware/baylibre-acme/protocol.c | 37 +++++++++++++++++++++++++++++++++++
src/hardware/baylibre-acme/protocol.h | 3 +++
3 files changed, 41 insertions(+)
diff --git a/src/hardware/baylibre-acme/api.c b/src/hardware/baylibre-acme/api.c
index def373d..92e1d49 100644
--- a/src/hardware/baylibre-acme/api.c
+++ b/src/hardware/baylibre-acme/api.c
@@ -241,6 +241,7 @@ static int config_set(uint32_t key, GVariant *data,
break;
}
devc->samplerate = samplerate;
+ bl_acme_maybe_set_update_interval(sdi, samplerate);
break;
case SR_CONF_PROBE_FACTOR:
if (!cg)
diff --git a/src/hardware/baylibre-acme/protocol.c
b/src/hardware/baylibre-acme/protocol.c
index 656e89f..814f11d 100644
--- a/src/hardware/baylibre-acme/protocol.c
+++ b/src/hardware/baylibre-acme/protocol.c
@@ -281,6 +281,43 @@ static int get_shunt_path(const struct sr_channel_group
*cg, GString *path)
return ret;
}
+/*
+ * Try setting the update_interval sysfs attribute for each probe according
+ * to samplerate.
+ */
+SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
+ uint64_t samplerate)
+{
+ struct sr_channel_group *cg;
+ struct channel_group_priv *cgp;
+ GString *hwmon;
+ GSList *l;
+ FILE *fd;
+
+ for (l = sdi->channel_groups; l != NULL; l = l->next) {
+ cg = l->data;
+ cgp = cg->priv;
+
+ hwmon = g_string_sized_new(64);
+ g_string_append_printf(hwmon,
+ "/sys/class/hwmon/hwmon%d/update_interval",
+ cgp->hwmon_num);
+
+ if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) {
+ fd = g_fopen(hwmon->str, "w");
+ if (!fd) {
+ g_string_free(hwmon, TRUE);
+ continue;
+ }
+
+ g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate);
+ fclose(fd);
+ }
+
+ g_string_free(hwmon, TRUE);
+ }
+}
+
SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
uint64_t *shunt)
{
diff --git a/src/hardware/baylibre-acme/protocol.h
b/src/hardware/baylibre-acme/protocol.h
index 3972aa2..5f21965 100644
--- a/src/hardware/baylibre-acme/protocol.h
+++ b/src/hardware/baylibre-acme/protocol.h
@@ -81,6 +81,9 @@ SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
unsigned int addr, int prb_num);
+SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
+ uint64_t samplerate);
+
SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
uint64_t *shunt);
SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg,
--
2.1.4
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