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diff --git a/src/sigrok.c b/src/sigrok.c
--- /dev/null
+++ b/src/sigrok.c
@@ -0,0 +1,399 @@
+/*
+ * collectd - src/sigrok.c
+ * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <pthread.h>
+
+#include <glib.h>
+#include <libsigrok/libsigrok.h>
+
+/* Minimum interval between dispatches coming from this plugin. The RRD
+ * plugin, at least, complains when written to with sub-second intervals.*/
+#define DEFAULT_MIN_DISPATCH_INTERVAL TIME_T_TO_CDTIME_T(0)
+
+static pthread_t sr_thread;
+static int sr_thread_running = FALSE;
+GSList *config_devices;
+static int num_devices;
+static int loglevel = SR_LOG_WARN;
+static struct sr_context *sr_ctx;
+
+struct config_device {
+ char *name;
+ char *driver;
+ char *conn;
+ char *serialcomm;
+ struct sr_dev_inst *sdi;
+ cdtime_t min_dispatch_interval;
+ cdtime_t last_dispatch;
+};
+
+
+static int sigrok_log_callback(void*cb_data __attribute__((unused)),
+ int msg_loglevel, const char *format, va_list args)
+{
+ char s[512];
+
+ if (msg_loglevel <= loglevel) {
+ vsnprintf(s, 512, format, args);
+ plugin_log(LOG_INFO, "sigrok plugin: %s", s);
+ }
+
+ return 0;
+}
+
+static int sigrok_config_device(oconfig_item_t *ci)
+{
+ struct config_device *cfdev;
+ int i;
+
+ if (!(cfdev = malloc(sizeof(struct config_device)))) {
+ ERROR("sigrok plugin: malloc() failed.");
+ return -1;
+ }
+ memset(cfdev, 0, sizeof(*cfdev));
+ if (cf_util_get_string(ci, &cfdev->name)) {
+ free(cfdev);
+ WARNING("sigrok plugin: Invalid device name.");
+ return -1;
+ }
+ cfdev->min_dispatch_interval = DEFAULT_MIN_DISPATCH_INTERVAL;
+
+ for (i = 0; i < ci->children_num; i++) {
+ oconfig_item_t *item = ci->children + i;
+ if (!strcasecmp(item->key, "driver"))
+ cf_util_get_string(item, &cfdev->driver);
+ else if (!strcasecmp(item->key, "conn"))
+ cf_util_get_string(item, &cfdev->conn);
+ else if (!strcasecmp(item->key, "serialcomm"))
+ cf_util_get_string(item, &cfdev->serialcomm);
+ else if (!strcasecmp(item->key, "minimuminterval"))
+ cf_util_get_cdtime(item, &cfdev->min_dispatch_interval);
+ else
+ WARNING("sigrok plugin: Invalid keyword \"%s\".",
+ item->key);
+ }
+
+ config_devices = g_slist_append(config_devices, cfdev);
+
+ return 0;
+}
+
+static int sigrok_config(oconfig_item_t *ci)
+{
+ int i;
+
+ for (i = 0; i < ci->children_num; i++) {
+ oconfig_item_t *item = ci->children + i;
+ if (strcasecmp("LogLevel", item->key) == 0) {
+ int status;
+ int tmp = -1;
+
+ status = cf_util_get_int (item, &tmp);
+ if (status != 0)
+ continue;
+ else if ((tmp < 0) || (tmp > 5)) {
+ ERROR ("sigrok plugin: The \"LogLevel\" "
+ "configuration option expects "
+ "an integer between 0 and 5 "
+ "(inclusive); you provided %i.",
+ tmp);
+ continue;
+ }
+ loglevel = tmp;
+ } else if (!strcasecmp(item->key, "Device"))
+ sigrok_config_device(item);
+ else
+ WARNING("sigrok plugin: Invalid keyword \"%s\".",
+ item->key);
+ }
+
+ return 0;
+}
+
+static char *sigrok_value_type(const struct sr_datafeed_analog *analog)
+{
+ char *s;
+
+ if (analog->mq == SR_MQ_VOLTAGE)
+ s = "voltage";
+ else if (analog->mq == SR_MQ_CURRENT)
+ s = "current";
+ else if (analog->mq == SR_MQ_FREQUENCY)
+ s = "frequency";
+ else if (analog->mq == SR_MQ_POWER)
+ s = "power";
+ else if (analog->mq == SR_MQ_TEMPERATURE)
+ s = "temperature";
+ else if (analog->mq == SR_MQ_RELATIVE_HUMIDITY)
+ s = "humidity";
+ else if (analog->mq == SR_MQ_SOUND_PRESSURE_LEVEL)
+ s = "spl";
+ else
+ s = "gauge";
+
+ return s;
+}
+
+static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
+ const struct sr_datafeed_packet *packet, void *cb_data)
+{
+ const struct sr_datafeed_analog *analog;
+ struct config_device *cfdev;
+ GSList *l;
+ value_t value;
+ value_list_t vl = VALUE_LIST_INIT;
+
+ /* Find this device's configuration. */
+ cfdev = NULL;
+ for (l = config_devices; l; l = l->next) {
+ cfdev = l->data;
+ if (cfdev->sdi == sdi) {
+ /* Found it. */
+ break;
+ }
+ cfdev = NULL;
+ }
+
+ if (!cfdev) {
+ ERROR("sigrok plugin: Received data from driver \"%s\" but "
+ "can't find a configuration / device matching "
+ "it.", sdi->driver->name);
+ return;
+ }
+
+ if (packet->type == SR_DF_END) {
+ /* TODO: try to restart acquisition after a delay? */
+ WARNING("sigrok plugin: acquisition for \"%s\" ended.",
+ cfdev->name);
+ return;
+ }
+
+ if (packet->type != SR_DF_ANALOG)
+ return;
+
+ if ((cfdev->min_dispatch_interval != 0)
+ && ((cdtime() - cfdev->last_dispatch)
+ < cfdev->min_dispatch_interval))
+ return;
+
+ /* Ignore all but the first sample on the first probe. */
+ analog = packet->payload;
+ value.gauge = analog->data[0];
+ vl.values = &value;
+ vl.values_len = 1;
+ sstrncpy(vl.host, hostname_g, sizeof(vl.host));
+ sstrncpy(vl.plugin, "sigrok", sizeof(vl.plugin));
+ ssnprintf(vl.plugin_instance, sizeof(vl.plugin_instance),
+ "%s", cfdev->name);
+ sstrncpy(vl.type, sigrok_value_type(analog), sizeof(vl.type));
+
+ plugin_dispatch_values(&vl);
+ cfdev->last_dispatch = cdtime();
+}
+
+static void sigrok_free_drvopts(struct sr_config *src)
+{
+ g_variant_unref(src->data);
+ g_free(src);
+}
+
+static int sigrok_init_driver(struct config_device *cfdev,
+ struct sr_dev_driver *drv)
+{
+ struct sr_config *src;
+ GSList *devlist, *drvopts;
+ char hwident[512];
+
+ if (sr_driver_init(sr_ctx, drv) != SR_OK)
+ /* Error was logged by libsigrok. */
+ return -1;
+
+ drvopts = NULL;
+ if (cfdev->conn) {
+ if (!(src = malloc(sizeof(struct sr_config))))
+ return -1;
+ src->key = SR_CONF_CONN;
+ src->data = g_variant_new_string(cfdev->conn);
+ drvopts = g_slist_append(drvopts, src);
+ }
+ if (cfdev->serialcomm) {
+ if (!(src = malloc(sizeof(struct sr_config))))
+ return -1;
+ src->key = SR_CONF_SERIALCOMM;
+ src->data = g_variant_new_string(cfdev->serialcomm);
+ drvopts = g_slist_append(drvopts, src);
+ }
+ devlist = sr_driver_scan(drv, drvopts);
+ g_slist_free_full(drvopts, (GDestroyNotify)sigrok_free_drvopts);
+ if (!devlist) {
+ /* Not an error, but the user should know about it. */
+ WARNING("sigrok plugin: No device found for \"%s\".",
+ cfdev->name);
+ return 0;
+ }
+
+ if (g_slist_length(devlist) > 1) {
+ INFO("sigrok plugin: %d sigrok devices for device entry "
+ "\"%s\": must be 1.",
+ g_slist_length(devlist), cfdev->name);
+ return -1;
+ }
+ 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 : "");
+ 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)
+ return -1;
+
+ return 1;
+}
+
+static void *sigrok_read_thread(void *arg __attribute__((unused)))
+{
+ struct sr_dev_driver *drv, **drvlist;
+ GSList *l;
+ struct config_device *cfdev;
+ int ret, i;
+
+ sr_log_callback_set(sigrok_log_callback, NULL);
+ sr_log_loglevel_set(loglevel);
+
+ if ((ret = sr_init(&sr_ctx)) != SR_OK) {
+ ERROR("sigrok plugin: Failed to initialize libsigrok: %s.",
+ sr_strerror(ret));
+ return NULL;
+ }
+
+ if (!sr_session_new())
+ return NULL;
+
+ num_devices = 0;
+ drvlist = sr_driver_list();
+ for (l = config_devices; l; l = l->next) {
+ cfdev = l->data;
+ drv = NULL;
+ for (i = 0; drvlist[i]; i++) {
+ if (!strcmp(drvlist[i]->name, cfdev->driver)) {
+ drv = drvlist[i];
+ break;
+ }
+ }
+ if (!drv) {
+ ERROR("sigrok plugin: Unknown driver \"%s\".",
+ cfdev->driver);
+ return NULL;
+ }
+
+ if ((ret = sigrok_init_driver(cfdev, drv)) < 0)
+ /* Error was already logged. */
+ return NULL;
+
+ num_devices += ret;
+ }
+
+ 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)
+ return NULL;
+
+ /* Start acquisition on all devices. */
+ if (sr_session_start() != SR_OK)
+ return NULL;
+
+ /* Main loop, runs forever. */
+ sr_session_run();
+
+ sr_session_stop();
+ sr_session_dev_remove_all();
+ }
+
+ sr_session_destroy();
+
+ sr_exit(sr_ctx);
+
+ pthread_exit(NULL);
+ sr_thread_running = FALSE;
+
+ return NULL;
+}
+
+static int sigrok_init(void)
+{
+ int status;
+
+ if (sr_thread_running) {
+ ERROR("sigrok plugin: Thread already running.");
+ return -1;
+ }
+
+ if ((status = plugin_thread_create(&sr_thread, NULL, sigrok_read_thread,
+ NULL)) != 0) {
+ ERROR("sigrok plugin: Failed to create thread: %s.",
+ strerror(status));
+ return -1;
+ }
+ sr_thread_running = TRUE;
+
+ return 0;
+}
+
+static int sigrok_shutdown(void)
+{
+ struct config_device *cfdev;
+ GSList *l;
+
+ if (sr_thread_running) {
+ pthread_cancel(sr_thread);
+ pthread_join(sr_thread, NULL);
+ }
+
+ for (l = config_devices; l; l = l->next) {
+ cfdev = l->data;
+ free(cfdev->name);
+ free(cfdev->driver);
+ free(cfdev->conn);
+ free(cfdev->serialcomm);
+ free(cfdev);
+ }
+ g_slist_free(config_devices);
+
+ return 0;
+}
+
+void module_register(void)
+{
+ plugin_register_complex_config("sigrok", sigrok_config);
+ plugin_register_init("sigrok", sigrok_init);
+ plugin_register_shutdown("sigrok", sigrok_shutdown);
+}