Add SR_T_MQLIST.

[libsigrok.git] / src / device.c

diff --git a/src/device.c b/src/device.c
index fe3e231616e67c13989be8340cb74dcddd7195ae..dd34f79600dd4fe81797fad4b4b9a8cc3db46196 100644 (file)
--- a/src/device.c
+++ b/src/device.c
@@ -133,6 +133,25 @@ SR_API int sr_dev_channel_enable(struct sr_channel *channel,
        return SR_OK;
 }
 
+/* Returns the next enabled channel, wrapping around if necessary. */
+SR_PRIV struct sr_channel *sr_next_enabled_channel(const struct sr_dev_inst *sdi,
+               struct sr_channel *cur_channel)
+{
+       struct sr_channel *next_channel;
+       GSList *l;
+
+       next_channel = cur_channel;
+       do {
+               l = g_slist_find(sdi->channels, next_channel);
+               if (l && l->next)
+                       next_channel = l->next->data;
+               else
+                       next_channel = sdi->channels->data;
+       } while (!next_channel->enabled);
+
+       return next_channel;
+}
+
 /**
  * Determine whether the specified device instance has the specified
  * capability.