X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fhp-3457a%2Fapi.c;h=9f006df5600f43889b8a58bfde775c079c49c14d;hb=2881eef6ff9b33741337017045d4f98153a91f1c;hp=f828cfd817f3743c7c764561c8ac8c5737285cff;hpb=9417f26fd47556c4b4f6ecaa08a2860672664eb9;p=libsigrok.git

diff --git a/src/hardware/hp-3457a/api.c b/src/hardware/hp-3457a/api.c
index f828cfd8..9f006df5 100644
--- a/src/hardware/hp-3457a/api.c
+++ b/src/hardware/hp-3457a/api.c
@@ -52,12 +52,9 @@ static int create_front_channel(struct sr_dev_inst *sdi, int chan_idx)
 				 TRUE, "Front");
 	channel->priv = chanc;
 
-	front = g_malloc0(sizeof(*front));
-	front->name = g_strdup("Front");
+	front = sr_channel_group_new(sdi, "Front", NULL);
 	front->channels = g_slist_append(front->channels, channel);
 
-	sdi->channel_groups = g_slist_append(sdi->channel_groups, front);
-
 	return chan_idx;
 }
 
@@ -74,10 +71,7 @@ static int create_rear_channels(struct sr_dev_inst *sdi, int chan_idx,
 	if (!card)
 		return chan_idx;
 
-	group = g_malloc0(sizeof(*group));
-	group->priv = NULL;
-	group->name = g_strdup(card->cg_name);
-	sdi->channel_groups = g_slist_append(sdi->channel_groups, group);
+	group = sr_channel_group_new(sdi, card->cg_name, NULL);
 
 	for (i = 0; i < card->num_channels; i++) {
 
@@ -127,6 +121,14 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 	struct sr_dev_inst *sdi;
 	struct dev_context *devc;
 
+	/*
+	 * The device cannot get identified by means of SCPI queries.
+	 * Neither shall non-SCPI requests get emitted before reliable
+	 * identification of the device. Assume that we only get here
+	 * when user specs led us to believe it's safe to communicate
+	 * to the expected kind of device.
+	 */
+
 	/*
 	 * This command ensures we receive an EOI after every response, so that
 	 * we don't wait the entire timeout after the response is received.
@@ -170,6 +172,14 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 
 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 {
+	const char *conn;
+
+	/* Only scan for a device when conn= was specified. */
+	conn = NULL;
+	(void)sr_serial_extract_options(options, &conn, NULL);
+	if (!conn)
+		return NULL;
+
 	return sr_scpi_scan(di->context, options, probe_device);
 }