Backport of https://github.com/u1f35c/collectd/commit/9e36cd85a2bbd6daa55f1f392f60f9c95573ae2c
aka https://github.com/collectd/collectd/issues/1574

--- a/configure.ac
+++ b/configure.ac
@@ -5367,7 +5367,7 @@ AC_SUBST([BUILD_WITH_LIBSENSORS_LIBS])
 # libsigrok {{{
 AC_SUBST([LIBSIGROK_CFLAGS])
 AC_SUBST([LIBSIGROK_LIBS])
-PKG_CHECK_MODULES([LIBSIGROK], [libsigrok < 0.4],
+PKG_CHECK_MODULES([LIBSIGROK], [libsigrok >= 0.4],
   [with_libsigrok="yes"],
   [with_libsigrok="no (pkg-config could not find libsigrok)"]
 )
--- a/src/sigrok.c
+++ b/src/sigrok.c
@@ -127,22 +127,22 @@ static int sigrok_config(oconfig_item_t *ci) {
   return 0;
 }
 
-static const char *sigrok_value_type(const struct sr_datafeed_analog *analog) {
+static const char *sigrok_value_type(const struct sr_analog_meaning *meaning) {
   const char *s;
 
-  if (analog->mq == SR_MQ_VOLTAGE)
+  if (meaning->mq == SR_MQ_VOLTAGE)
     s = "voltage";
-  else if (analog->mq == SR_MQ_CURRENT)
+  else if (meaning->mq == SR_MQ_CURRENT)
     s = "current";
-  else if (analog->mq == SR_MQ_FREQUENCY)
+  else if (meaning->mq == SR_MQ_FREQUENCY)
     s = "frequency";
-  else if (analog->mq == SR_MQ_POWER)
+  else if (meaning->mq == SR_MQ_POWER)
     s = "power";
-  else if (analog->mq == SR_MQ_TEMPERATURE)
+  else if (meaning->mq == SR_MQ_TEMPERATURE)
     s = "temperature";
-  else if (analog->mq == SR_MQ_RELATIVE_HUMIDITY)
+  else if (meaning->mq == SR_MQ_RELATIVE_HUMIDITY)
     s = "humidity";
-  else if (analog->mq == SR_MQ_SOUND_PRESSURE_LEVEL)
+  else if (meaning->mq == SR_MQ_SOUND_PRESSURE_LEVEL)
     s = "spl";
   else
     s = "gauge";
@@ -172,7 +172,7 @@ static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
     ERROR("sigrok plugin: Received data from driver \"%s\" but "
           "can't find a configuration / device matching "
           "it.",
-          sdi->driver->name);
+          sr_dev_inst_driver_get(sdi)->name);
     return;
   }
 
@@ -191,11 +191,11 @@ static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
 
   /* Ignore all but the first sample on the first probe. */
   analog = packet->payload;
-  vl.values = &(value_t){.gauge = analog->data[0]};
+  vl.values = &(value_t){.gauge = ((float *) analog->data)[0]};
   vl.values_len = 1;
   sstrncpy(vl.plugin, "sigrok", sizeof(vl.plugin));
   sstrncpy(vl.plugin_instance, cfdev->name, sizeof(vl.plugin_instance));
-  sstrncpy(vl.type, sigrok_value_type(analog), sizeof(vl.type));
+  sstrncpy(vl.type, sigrok_value_type(&analog->meaning[0]), sizeof(vl.type));
 
   plugin_dispatch_values(&vl);
   cfdev->last_dispatch = cdtime();
@@ -207,6 +207,7 @@ static void sigrok_free_drvopts(struct sr_config *src) {
 }
 
 static int sigrok_init_driver(struct config_device *cfdev,
+                              struct sr_session *session,
                               struct sr_dev_driver *drv) {
   struct sr_config *src;
   GSList *devlist, *drvopts;
@@ -248,21 +249,22 @@ static int sigrok_init_driver(struct config_device *cfdev,
   cfdev->sdi = devlist->data;
   g_slist_free(devlist);
   ssnprintf(hwident, sizeof(hwident), "%s %s %s",
-            cfdev->sdi->vendor ? cfdev->sdi->vendor : "",
-            cfdev->sdi->model ? cfdev->sdi->model : "",
-            cfdev->sdi->version ? cfdev->sdi->version : "");
+            sr_dev_inst_vendor_get(cfdev->sdi),
+            sr_dev_inst_model_get(cfdev->sdi),
+            sr_dev_inst_version_get(cfdev->sdi));
   INFO("sigrok plugin: Device \"%s\" is a %s", cfdev->name, hwident);
 
   if (sr_dev_open(cfdev->sdi) != SR_OK)
     return -1;
 
-  if (sr_session_dev_add(cfdev->sdi) != SR_OK)
+  if (sr_session_dev_add(session, cfdev->sdi) != SR_OK)
     return -1;
 
   return 1;
 }
 
 static void *sigrok_read_thread(void *arg __attribute__((unused))) {
+  struct sr_session *session;
   struct sr_dev_driver *drv, **drvlist;
   GSList *l;
   struct config_device *cfdev;
@@ -277,11 +279,11 @@ static void *sigrok_read_thread(void *arg __attribute__((unused))) {
     return NULL;
   }
 
-  if (!sr_session_new())
+  if (!sr_session_new(sr_ctx, &session))
     return NULL;
 
   num_devices = 0;
-  drvlist = sr_driver_list();
+  drvlist = sr_driver_list(sr_ctx);
   for (l = config_devices; l; l = l->next) {
     cfdev = l->data;
     drv = NULL;
@@ -296,7 +298,7 @@ static void *sigrok_read_thread(void *arg __attribute__((unused))) {
       return NULL;
     }
 
-    if ((ret = sigrok_init_driver(cfdev, drv)) < 0)
+    if ((ret = sigrok_init_driver(cfdev, session, drv)) < 0)
       /* Error was already logged. */
       return NULL;
 
@@ -305,21 +307,22 @@ static void *sigrok_read_thread(void *arg __attribute__((unused))) {
 
   if (num_devices > 0) {
     /* Do this only when we're sure there's hardware to talk to. */
-    if (sr_session_datafeed_callback_add(sigrok_feed_callback, NULL) != SR_OK)
+    if (sr_session_datafeed_callback_add(session, sigrok_feed_callback,
+                                         NULL) != SR_OK)
       return NULL;
 
     /* Start acquisition on all devices. */
-    if (sr_session_start() != SR_OK)
+    if (sr_session_start(session) != SR_OK)
       return NULL;
 
     /* Main loop, runs forever. */
-    sr_session_run();
+    sr_session_run(session);
 
-    sr_session_stop();
-    sr_session_dev_remove_all();
+    sr_session_stop(session);
+    sr_session_dev_remove_all(session);
   }
 
-  sr_session_destroy();
+  sr_session_destroy(session);
 
   sr_exit(sr_ctx);