1 /*
2 * collectd - src/sigrok.c
3 * Copyright (C) 2013 Bert Vermeulen
4 *
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.
9 *
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.
14 *
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/>.
17 *
18 * Authors:
19 * Bert Vermeulen <bert at biot.com>
20 */
22 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <time.h>
32 #include <glib.h>
33 #include <libsigrok/libsigrok.h>
35 /* Minimum interval between dispatches coming from this plugin. The RRD
36 * plugin, at least, complains when written to with sub-second intervals.*/
37 #define DEFAULT_MIN_DISPATCH_INTERVAL TIME_T_TO_CDTIME_T(0)
39 static pthread_t sr_thread;
40 static int sr_thread_running = FALSE;
41 GSList *config_devices;
42 static int num_devices;
43 static int loglevel = SR_LOG_WARN;
44 static struct sr_context *sr_ctx;
46 struct config_device {
47 char *name;
48 char *driver;
49 char *conn;
50 char *serialcomm;
51 struct sr_dev_inst *sdi;
52 cdtime_t min_dispatch_interval;
53 cdtime_t last_dispatch;
54 };
56 static int sigrok_log_callback(void *cb_data __attribute__((unused)),
57 int msg_loglevel, const char *format,
58 va_list args) {
59 char s[512];
61 if (msg_loglevel <= loglevel) {
62 vsnprintf(s, 512, format, args);
63 plugin_log(LOG_INFO, "sigrok plugin: %s", s);
64 }
66 return 0;
67 }
69 static int sigrok_config_device(oconfig_item_t *ci) {
70 struct config_device *cfdev;
72 if (!(cfdev = calloc(1, sizeof(*cfdev)))) {
73 ERROR("sigrok plugin: calloc failed.");
74 return -1;
75 }
76 if (cf_util_get_string(ci, &cfdev->name)) {
77 free(cfdev);
78 WARNING("sigrok plugin: Invalid device name.");
79 return -1;
80 }
81 cfdev->min_dispatch_interval = DEFAULT_MIN_DISPATCH_INTERVAL;
83 for (int i = 0; i < ci->children_num; i++) {
84 oconfig_item_t *item = ci->children + i;
85 if (!strcasecmp(item->key, "driver"))
86 cf_util_get_string(item, &cfdev->driver);
87 else if (!strcasecmp(item->key, "conn"))
88 cf_util_get_string(item, &cfdev->conn);
89 else if (!strcasecmp(item->key, "serialcomm"))
90 cf_util_get_string(item, &cfdev->serialcomm);
91 else if (!strcasecmp(item->key, "minimuminterval"))
92 cf_util_get_cdtime(item, &cfdev->min_dispatch_interval);
93 else
94 WARNING("sigrok plugin: Invalid keyword \"%s\".", item->key);
95 }
97 config_devices = g_slist_append(config_devices, cfdev);
99 return 0;
100 }
102 static int sigrok_config(oconfig_item_t *ci) {
103 for (int i = 0; i < ci->children_num; i++) {
104 oconfig_item_t *item = ci->children + i;
105 if (strcasecmp("LogLevel", item->key) == 0) {
106 int status;
107 int tmp = -1;
109 status = cf_util_get_int(item, &tmp);
110 if (status != 0)
111 continue;
112 else if ((tmp < 0) || (tmp > 5)) {
113 ERROR("sigrok plugin: The \"LogLevel\" "
114 "configuration option expects "
115 "an integer between 0 and 5 "
116 "(inclusive); you provided %i.",
117 tmp);
118 continue;
119 }
120 loglevel = tmp;
121 } else if (!strcasecmp(item->key, "Device"))
122 sigrok_config_device(item);
123 else
124 WARNING("sigrok plugin: Invalid keyword \"%s\".", item->key);
125 }
127 return 0;
128 }
130 static const char *sigrok_value_type(const struct sr_datafeed_analog *analog) {
131 const char *s;
133 if (analog->mq == SR_MQ_VOLTAGE)
134 s = "voltage";
135 else if (analog->mq == SR_MQ_CURRENT)
136 s = "current";
137 else if (analog->mq == SR_MQ_FREQUENCY)
138 s = "frequency";
139 else if (analog->mq == SR_MQ_POWER)
140 s = "power";
141 else if (analog->mq == SR_MQ_TEMPERATURE)
142 s = "temperature";
143 else if (analog->mq == SR_MQ_RELATIVE_HUMIDITY)
144 s = "humidity";
145 else if (analog->mq == SR_MQ_SOUND_PRESSURE_LEVEL)
146 s = "spl";
147 else
148 s = "gauge";
150 return s;
151 }
153 static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
154 const struct sr_datafeed_packet *packet,
155 void *cb_data) {
156 const struct sr_datafeed_analog *analog;
157 struct config_device *cfdev;
158 value_list_t vl = VALUE_LIST_INIT;
160 /* Find this device's configuration. */
161 cfdev = NULL;
162 for (GSList *l = config_devices; l; l = l->next) {
163 cfdev = l->data;
164 if (cfdev->sdi == sdi) {
165 /* Found it. */
166 break;
167 }
168 cfdev = NULL;
169 }
171 if (!cfdev) {
172 ERROR("sigrok plugin: Received data from driver \"%s\" but "
173 "can't find a configuration / device matching "
174 "it.",
175 sdi->driver->name);
176 return;
177 }
179 if (packet->type == SR_DF_END) {
180 /* TODO: try to restart acquisition after a delay? */
181 WARNING("sigrok plugin: acquisition for \"%s\" ended.", cfdev->name);
182 return;
183 }
185 if (packet->type != SR_DF_ANALOG)
186 return;
188 if ((cfdev->min_dispatch_interval != 0) &&
189 ((cdtime() - cfdev->last_dispatch) < cfdev->min_dispatch_interval))
190 return;
192 /* Ignore all but the first sample on the first probe. */
193 analog = packet->payload;
194 vl.values = &(value_t){.gauge = analog->data[0]};
195 vl.values_len = 1;
196 sstrncpy(vl.plugin, "sigrok", sizeof(vl.plugin));
197 sstrncpy(vl.plugin_instance, cfdev->name, sizeof(vl.plugin_instance));
198 sstrncpy(vl.type, sigrok_value_type(analog), sizeof(vl.type));
200 plugin_dispatch_values(&vl);
201 cfdev->last_dispatch = cdtime();
202 }
204 static void sigrok_free_drvopts(struct sr_config *src) {
205 g_variant_unref(src->data);
206 g_free(src);
207 }
209 static int sigrok_init_driver(struct config_device *cfdev,
210 struct sr_dev_driver *drv) {
211 struct sr_config *src;
212 GSList *devlist, *drvopts;
213 char hwident[512];
215 if (sr_driver_init(sr_ctx, drv) != SR_OK)
216 /* Error was logged by libsigrok. */
217 return -1;
219 drvopts = NULL;
220 if (cfdev->conn) {
221 if (!(src = malloc(sizeof(*src))))
222 return -1;
223 src->key = SR_CONF_CONN;
224 src->data = g_variant_new_string(cfdev->conn);
225 drvopts = g_slist_append(drvopts, src);
226 }
227 if (cfdev->serialcomm) {
228 if (!(src = malloc(sizeof(*src))))
229 return -1;
230 src->key = SR_CONF_SERIALCOMM;
231 src->data = g_variant_new_string(cfdev->serialcomm);
232 drvopts = g_slist_append(drvopts, src);
233 }
234 devlist = sr_driver_scan(drv, drvopts);
235 g_slist_free_full(drvopts, (GDestroyNotify)sigrok_free_drvopts);
236 if (!devlist) {
237 /* Not an error, but the user should know about it. */
238 WARNING("sigrok plugin: No device found for \"%s\".", cfdev->name);
239 return 0;
240 }
242 if (g_slist_length(devlist) > 1) {
243 INFO("sigrok plugin: %d sigrok devices for device entry "
244 "\"%s\": must be 1.",
245 g_slist_length(devlist), cfdev->name);
246 return -1;
247 }
248 cfdev->sdi = devlist->data;
249 g_slist_free(devlist);
250 ssnprintf(hwident, sizeof(hwident), "%s %s %s",
251 cfdev->sdi->vendor ? cfdev->sdi->vendor : "",
252 cfdev->sdi->model ? cfdev->sdi->model : "",
253 cfdev->sdi->version ? cfdev->sdi->version : "");
254 INFO("sigrok plugin: Device \"%s\" is a %s", cfdev->name, hwident);
256 if (sr_dev_open(cfdev->sdi) != SR_OK)
257 return -1;
259 if (sr_session_dev_add(cfdev->sdi) != SR_OK)
260 return -1;
262 return 1;
263 }
265 static void *sigrok_read_thread(void *arg __attribute__((unused))) {
266 struct sr_dev_driver *drv, **drvlist;
267 GSList *l;
268 struct config_device *cfdev;
269 int ret, i;
271 sr_log_callback_set(sigrok_log_callback, NULL);
272 sr_log_loglevel_set(loglevel);
274 if ((ret = sr_init(&sr_ctx)) != SR_OK) {
275 ERROR("sigrok plugin: Failed to initialize libsigrok: %s.",
276 sr_strerror(ret));
277 return NULL;
278 }
280 if (!sr_session_new())
281 return NULL;
283 num_devices = 0;
284 drvlist = sr_driver_list();
285 for (l = config_devices; l; l = l->next) {
286 cfdev = l->data;
287 drv = NULL;
288 for (i = 0; drvlist[i]; i++) {
289 if (!strcmp(drvlist[i]->name, cfdev->driver)) {
290 drv = drvlist[i];
291 break;
292 }
293 }
294 if (!drv) {
295 ERROR("sigrok plugin: Unknown driver \"%s\".", cfdev->driver);
296 return NULL;
297 }
299 if ((ret = sigrok_init_driver(cfdev, drv)) < 0)
300 /* Error was already logged. */
301 return NULL;
303 num_devices += ret;
304 }
306 if (num_devices > 0) {
307 /* Do this only when we're sure there's hardware to talk to. */
308 if (sr_session_datafeed_callback_add(sigrok_feed_callback, NULL) != SR_OK)
309 return NULL;
311 /* Start acquisition on all devices. */
312 if (sr_session_start() != SR_OK)
313 return NULL;
315 /* Main loop, runs forever. */
316 sr_session_run();
318 sr_session_stop();
319 sr_session_dev_remove_all();
320 }
322 sr_session_destroy();
324 sr_exit(sr_ctx);
326 pthread_exit(NULL);
327 sr_thread_running = FALSE;
329 return NULL;
330 }
332 static int sigrok_init(void) {
333 int status;
335 if (sr_thread_running) {
336 ERROR("sigrok plugin: Thread already running.");
337 return -1;
338 }
340 status = plugin_thread_create(&sr_thread, NULL, sigrok_read_thread, NULL,
341 "sigrok read");
342 if (status != 0) {
343 char errbuf[1024];
344 ERROR("sigrok plugin: Failed to create thread: %s.",
345 sstrerror(errno, errbuf, sizeof(errbuf)));
346 return -1;
347 }
348 sr_thread_running = TRUE;
350 return 0;
351 }
353 static int sigrok_shutdown(void) {
354 struct config_device *cfdev;
355 GSList *l;
357 if (sr_thread_running) {
358 pthread_cancel(sr_thread);
359 pthread_join(sr_thread, NULL);
360 }
362 for (l = config_devices; l; l = l->next) {
363 cfdev = l->data;
364 free(cfdev->name);
365 free(cfdev->driver);
366 free(cfdev->conn);
367 free(cfdev->serialcomm);
368 free(cfdev);
369 }
370 g_slist_free(config_devices);
372 return 0;
373 }
375 void module_register(void) {
376 plugin_register_complex_config("sigrok", sigrok_config);
377 plugin_register_init("sigrok", sigrok_init);
378 plugin_register_shutdown("sigrok", sigrok_shutdown);
379 }