2 * collectd - src/sigrok.c
3 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include <libsigrok/libsigrok.h>
32 /* Minimum interval between dispatches coming from this plugin. The RRD
33 * plugin, at least, complains when written to with sub-second intervals.*/
34 #define DEFAULT_MIN_DISPATCH_INTERVAL TIME_T_TO_CDTIME_T(1)
36 static pthread_t sr_thread;
37 static int sr_thread_running = FALSE;
38 GSList *config_devices;
39 static struct sr_session *session = NULL;
40 static int num_devices;
41 static int loglevel = SR_LOG_WARN;
42 static struct sr_context *sr_ctx;
44 struct config_device {
49 struct sr_dev_inst *sdi;
50 cdtime_t min_dispatch_interval;
51 cdtime_t last_dispatch;
55 static int cd_logger(void *cb_data, int msg_loglevel, const char *format,
60 if (msg_loglevel <= loglevel) {
61 vsnprintf(s, 512, format, args);
62 plugin_log(LOG_INFO, "sigrok: %s", s);
68 static int sigrok_config_device(oconfig_item_t *ci)
71 struct config_device *cfdev;
74 if (ci->values_num != 1 || ci->values[0].type != OCONFIG_TYPE_STRING) {
75 ERROR("Invalid device name.");
79 if (!(cfdev = malloc(sizeof(struct config_device)))) {
80 ERROR("malloc() failed.");
83 memset(cfdev, 0, sizeof(struct config_device));
84 cf_util_get_string(ci, &cfdev->name);
85 cfdev->min_dispatch_interval = DEFAULT_MIN_DISPATCH_INTERVAL;
87 for (i = 0; i < ci->children_num; i++) {
88 item = ci->children + i;
89 if (item->values_num != 1) {
90 ERROR("Missing value for '%s'.", item->key);
93 if (!strcasecmp(item->key, "driver"))
94 ret = cf_util_get_string(item, &cfdev->driver);
95 else if (!strcasecmp(item->key, "conn"))
96 ret = cf_util_get_string(item, &cfdev->conn);
97 else if (!strcasecmp(item->key, "serialcomm"))
98 ret = cf_util_get_string(item, &cfdev->serialcomm);
99 else if (!strcasecmp(item->key, "interval"))
100 ret = cf_util_get_cdtime(item, &cfdev->min_dispatch_interval);
102 ERROR("Invalid keyword '%s'.", item->key);
107 config_devices = g_slist_append(config_devices, cfdev);
112 static int sigrok_config(oconfig_item_t *ci)
114 oconfig_item_t *item;
117 for (i = 0; i < ci->children_num; i++) {
118 item = ci->children + i;
119 if (!strcasecmp(item->key, "loglevel")) {
120 if (cf_util_get_int(item, &tmp) || tmp < 0 || tmp > 5) {
121 ERROR("Invalid loglevel");
125 } else if (!strcasecmp(item->key, "Device")) {
126 if (sigrok_config_device(item) != 0)
129 ERROR("Invalid keyword '%s'.", item->key);
137 static void free_drvopts(struct sr_config *src)
139 g_variant_unref(src->data);
143 static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
144 const struct sr_datafeed_packet *packet, void *cb_data)
146 const struct sr_datafeed_analog *analog;
147 struct config_device *cfdev;
150 value_list_t vl = VALUE_LIST_INIT;
151 int num_probes, s, p;
153 if (packet->type == SR_DF_END) {
154 /* TODO: try to restart acquisition after a delay? */
159 /* Find this device's configuration. */
161 for (l = config_devices; l; l = l->next) {
163 if (cfdev->sdi == sdi) {
170 ERROR("Unknown device instance in sigrok driver %s.", sdi->driver->name);
174 if (packet->type == SR_DF_ANALOG) {
175 if (cdtime() - cfdev->last_dispatch < cfdev->min_dispatch_interval)
178 analog = packet->payload;
179 num_probes = g_slist_length(analog->probes);
180 if (!(values = malloc(sizeof(value_t) * num_probes))) {
181 ERROR("malloc() failed.");
184 for (s = 0; s < analog->num_samples; s++) {
185 for (p = 0; p < num_probes; p++) {
186 values[s + p].gauge = analog->data[s + p];
190 vl.values_len = num_probes;
191 sstrncpy(vl.host, hostname_g, sizeof(vl.host));
192 sstrncpy(vl.plugin, "sigrok", sizeof(vl.plugin));
193 ssnprintf(vl.plugin_instance, sizeof(vl.plugin_instance),
195 sstrncpy(vl.type, "gauge", sizeof(vl.type));
196 plugin_dispatch_values(&vl);
198 cfdev->last_dispatch = cdtime();
203 static void *thread_init(void *arg __attribute__((unused)))
205 struct sr_dev_driver *drv, **drvlist;
206 struct sr_config *src;
207 GSList *devlist, *drvopts, *l;
208 struct config_device *cfdev;
214 sr_log_callback_set(cd_logger, NULL);
215 sr_log_loglevel_set(loglevel);
217 if ((ret = sr_init(&sr_ctx)) != SR_OK) {
218 ERROR("Failed to initialize libsigrok: %s.", sr_strerror(ret));
222 if (!(session = sr_session_new()))
226 drvlist = sr_driver_list();
227 for (l = config_devices; l; l = l->next) {
230 for (i = 0; drvlist[i]; i++) {
231 if (!strcmp(drvlist[i]->name, cfdev->driver)) {
237 ERROR("sigrok: Unknown driver '%s'.", cfdev->driver);
241 if (sr_driver_init(sr_ctx, drv) != SR_OK)
246 if (!(src = malloc(sizeof(struct sr_config))))
248 src->key = SR_CONF_CONN;
249 src->data = g_variant_new_string(cfdev->conn);
250 drvopts = g_slist_append(drvopts, src);
252 if (cfdev->serialcomm) {
253 if (!(src = malloc(sizeof(struct sr_config))))
255 src->key = SR_CONF_SERIALCOMM;
256 src->data = g_variant_new_string(cfdev->serialcomm);
257 drvopts = g_slist_append(drvopts, src);
259 devlist = sr_driver_scan(drv, drvopts);
260 g_slist_free_full(drvopts, (GDestroyNotify)free_drvopts);
262 /* No devices found for this driver. */
265 if (g_slist_length(devlist) > 1) {
266 INFO("sigrok: %d sigrok devices for device entry '%s': must be 1.",
267 g_slist_length(devlist), cfdev->name);
270 cfdev->sdi = devlist->data;
271 g_slist_free(devlist);
272 ssnprintf(hwident, sizeof(hwident), "%s %s %s",
273 cfdev->sdi->vendor ? cfdev->sdi->vendor : "",
274 cfdev->sdi->model ? cfdev->sdi->model : "",
275 cfdev->sdi->version ? cfdev->sdi->version : "");
276 INFO("sigrok: Device '%s' is a %s.", cfdev->name, hwident);
278 if (sr_dev_open(cfdev->sdi) != SR_OK)
281 if (sr_session_dev_add(cfdev->sdi) != SR_OK)
287 if (num_devices > 0) {
288 /* Do this only when we're sure there's hardware to talk to. */
289 if (sr_session_datafeed_callback_add(sigrok_feed_callback, NULL) != SR_OK)
292 /* Start acquisition on all devices. */
293 if (sr_session_start() != SR_OK)
296 /* Main loop, runs forever. */
300 sr_session_dev_remove_all();
303 sr_session_destroy();
308 sr_thread_running = FALSE;
313 static int sigrok_init(void)
317 if (sr_thread_running) {
318 ERROR("sigrok: Thread already running.");
322 if ((status = plugin_thread_create(&sr_thread, NULL, thread_init, NULL)) != 0) {
323 ERROR("sigrok: Failed to create thread: %s.", strerror(status));
326 sr_thread_running = TRUE;
331 static int sigrok_shutdown(void)
333 struct config_device *cfdev;
336 if (sr_thread_running) {
337 pthread_cancel(sr_thread);
338 pthread_join(sr_thread, NULL);
341 for (l = config_devices; l; l = l->next) {
346 free(cfdev->serialcomm);
349 g_slist_free(config_devices);
354 void module_register(void)
357 plugin_register_complex_config("sigrok", sigrok_config);
358 plugin_register_init("sigrok", sigrok_init);
359 plugin_register_shutdown("sigrok", sigrok_shutdown);