baylibre-acme: Optimize reading of values from sysfs.

[libsigrok.git] / src / hardware / baylibre-acme / api.c

diff --git a/src/hardware/baylibre-acme/api.c b/src/hardware/baylibre-acme/api.c
index 6827a16bfe5da763756f34318856411f0f220ee8..c91a9063fdfe949091b5f5a1ce546076f7512eb5 100644 (file)
--- a/src/hardware/baylibre-acme/api.c
+++ b/src/hardware/baylibre-acme/api.c
@@ -318,6 +318,34 @@ static int config_list(uint32_t key, GVariant **data,
        return ret;
 }
 
+static void dev_acquisition_close(const struct sr_dev_inst *sdi)
+{
+       GSList *chl;
+       struct sr_channel *ch;
+
+       for (chl = sdi->channels; chl; chl = chl->next) {
+               ch = chl->data;
+               bl_acme_close_channel(ch);
+       }
+}
+
+static int dev_acquisition_open(const struct sr_dev_inst *sdi)
+{
+       GSList *chl;
+       struct sr_channel *ch;
+
+       for (chl = sdi->channels; chl; chl = chl->next) {
+               ch = chl->data;
+               if (bl_acme_open_channel(ch)) {
+                       sr_err("Error opening channel %s", ch->name);
+                       dev_acquisition_close(sdi);
+                       return SR_ERR;
+               }
+       }
+
+       return 0;
+}
+
 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 {
        struct dev_context *devc;
@@ -327,6 +355,9 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
        if (sdi->status != SR_ST_ACTIVE)
                return SR_ERR_DEV_CLOSED;
 
+       if (dev_acquisition_open(sdi))
+               return SR_ERR;
+
        devc = sdi->priv;
        devc->samples_read = 0;