src/sigrok.c

   1 /*
   2  * collectd - src/sigrok.c
   3  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   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
  19 #include "collectd.h"
  20 #include "common.h"
  21 #include "plugin.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <time.h>
  27 #include <pthread.h>
  28
  29 #include <glib.h>
  30 #include <libsigrok/libsigrok.h>
  31
  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)
  35
  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;
  43
  44 struct config_device {
  45         char *name;
  46         char *driver;
  47         char *conn;
  48         char *serialcomm;
  49         struct sr_dev_inst *sdi;
  50         cdtime_t min_dispatch_interval;
  51         cdtime_t last_dispatch;
  52 };
  53
  54
  55 static int cd_logger(void *cb_data, int msg_loglevel, const char *format,
  56                 va_list args)
  57 {
  58         char s[512];
  59
  60         if (msg_loglevel <= loglevel) {
  61                 vsnprintf(s, 512, format, args);
  62                 plugin_log(LOG_INFO, "sigrok: %s", s);
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int sigrok_config_device(oconfig_item_t *ci)
  69 {
  70         oconfig_item_t *item;
  71         struct config_device *cfdev;
  72         int ret, i;
  73
  74         if (ci->values_num != 1 || ci->values[0].type != OCONFIG_TYPE_STRING) {
  75                 ERROR("Invalid device name.");
  76                 return 1;
  77         }
  78
  79         if (!(cfdev = malloc(sizeof(struct config_device)))) {
  80                 ERROR("malloc() failed.");
  81                 return 1;
  82         }
  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;
  86
  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);
  91                         return 1;
  92                 }
  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);
 101                 if (ret) {
 102                         ERROR("Invalid keyword '%s'.", item->key);
 103                         return 1;
 104                 }
 105         }
 106
 107         config_devices = g_slist_append(config_devices, cfdev);
 108
 109         return 0;
 110 }
 111
 112 static int sigrok_config(oconfig_item_t *ci)
 113 {
 114         oconfig_item_t *item;
 115         int tmp, i;
 116
 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");
 122                                 return 1;
 123                         }
 124                         loglevel = tmp;
 125                 } else if (!strcasecmp(item->key, "Device")) {
 126                         if (sigrok_config_device(item) != 0)
 127                                 return 1;
 128                 } else {
 129                         ERROR("Invalid keyword '%s'.", item->key);
 130                         return 1;
 131                 }
 132         }
 133
 134         return 0;
 135 }
 136
 137 static void free_drvopts(struct sr_config *src)
 138 {
 139         g_variant_unref(src->data);
 140         g_free(src);
 141 }
 142
 143 static void sigrok_feed_callback(const struct sr_dev_inst *sdi,
 144                 const struct sr_datafeed_packet *packet, void *cb_data)
 145 {
 146         const struct sr_datafeed_analog *analog;
 147         struct config_device *cfdev;
 148         GSList *l;
 149         value_t *values;
 150         value_list_t vl = VALUE_LIST_INIT;
 151         int num_probes, s, p;
 152
 153         if (packet->type == SR_DF_END) {
 154                 /* TODO: try to restart acquisition after a delay? */
 155                 INFO("oops! ended");
 156                 return;
 157         }
 158
 159         /* Find this device's configuration. */
 160         cfdev = NULL;
 161         for (l = config_devices; l; l = l->next) {
 162                 cfdev = l->data;
 163                 if (cfdev->sdi == sdi) {
 164                         /* Found it. */
 165                         break;
 166                 }
 167                 cfdev = NULL;
 168         }
 169         if (!cfdev) {
 170                 ERROR("Unknown device instance in sigrok driver %s.", sdi->driver->name);
 171                 return;
 172         }
 173
 174         if (packet->type == SR_DF_ANALOG) {
 175                 if (cdtime() - cfdev->last_dispatch < cfdev->min_dispatch_interval)
 176                         return;
 177
 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.");
 182                         return;
 183                 }
 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];
 187                         }
 188                 }
 189                 vl.values = values;
 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),
 194                                 "%s", cfdev->name);
 195                 sstrncpy(vl.type, "gauge", sizeof(vl.type));
 196                 plugin_dispatch_values(&vl);
 197
 198                 cfdev->last_dispatch = cdtime();
 199         }
 200
 201 }
 202
 203 static void *thread_init(void *arg)
 204 {
 205         struct sr_dev_driver *drv, **drvlist;
 206         struct sr_config *src;
 207         GSList *devlist, *drvopts, *l;
 208         struct config_device *cfdev;
 209         int ret, i;
 210         char hwident[512];
 211
 212         (void)arg;
 213
 214         sr_log_callback_set(cd_logger, NULL);
 215         sr_log_loglevel_set(loglevel);
 216
 217         if ((ret = sr_init(&sr_ctx)) != SR_OK) {
 218                 ERROR("Failed to initialize libsigrok: %s.", sr_strerror(ret));
 219                 return NULL;
 220         }
 221
 222         if (!(session = sr_session_new()))
 223                 return NULL;
 224
 225         num_devices = 0;
 226         drvlist = sr_driver_list();
 227         for (l = config_devices; l; l = l->next) {
 228                 cfdev = l->data;
 229                 drv = NULL;
 230                 for (i = 0; drvlist[i]; i++) {
 231                         if (!strcmp(drvlist[i]->name, cfdev->driver)) {
 232                                 drv = drvlist[i];
 233                                 break;
 234                         }
 235                 }
 236                 if (!drv) {
 237                         ERROR("sigrok: Unknown driver '%s'.", cfdev->driver);
 238                         return NULL;
 239                 }
 240
 241                 if (sr_driver_init(sr_ctx, drv) != SR_OK)
 242                         return NULL;
 243
 244                 drvopts = NULL;
 245                 if (cfdev->conn) {
 246                         if (!(src = malloc(sizeof(struct sr_config))))
 247                                 return NULL;
 248                         src->key = SR_CONF_CONN;
 249                         src->data = g_variant_new_string(cfdev->conn);
 250                         drvopts = g_slist_append(drvopts, src);
 251                 }
 252                 if (cfdev->serialcomm) {
 253                         if (!(src = malloc(sizeof(struct sr_config))))
 254                                 return NULL;
 255                         src->key = SR_CONF_SERIALCOMM;
 256                         src->data = g_variant_new_string(cfdev->serialcomm);
 257                         drvopts = g_slist_append(drvopts, src);
 258                 }
 259                 devlist = sr_driver_scan(drv, drvopts);
 260                 g_slist_free_full(drvopts, (GDestroyNotify)free_drvopts);
 261                 if (!devlist)
 262                         /* No devices found for this driver. */
 263                         continue;
 264
 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);
 268                         return NULL;
 269                 }
 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);
 277
 278                 if (sr_dev_open(cfdev->sdi) != SR_OK)
 279                         return NULL;
 280
 281                 if (sr_session_dev_add(cfdev->sdi) != SR_OK)
 282                         return NULL;
 283
 284                 num_devices++;
 285         }
 286
 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)
 290                         return NULL;
 291
 292                 /* Start acquisition on all devices. */
 293                 if (sr_session_start() != SR_OK)
 294                         return NULL;
 295
 296                 /* Main loop, runs forever. */
 297                 sr_session_run();
 298
 299                 sr_session_stop();
 300                 sr_session_dev_remove_all();
 301         }
 302
 303         sr_session_destroy();
 304
 305         sr_exit(sr_ctx);
 306
 307         pthread_exit(NULL);
 308         sr_thread_running = FALSE;
 309
 310         return NULL;
 311 }
 312
 313 static int sigrok_init(void)
 314 {
 315         int status;
 316
 317         if (sr_thread_running) {
 318                 ERROR("sigrok: Thread already running.");
 319                 return -1;
 320         }
 321
 322         if ((status = plugin_thread_create(&sr_thread, NULL, thread_init, NULL)) != 0) {
 323                 ERROR("sigrok: Failed to create thread: %s.", strerror(status));
 324                 return -1;
 325         }
 326         sr_thread_running = TRUE;
 327
 328         return 0;
 329 }
 330
 331 static int sigrok_shutdown(void)
 332 {
 333         struct config_device *cfdev;
 334         GSList *l;
 335
 336         if (sr_thread_running) {
 337                 pthread_cancel(sr_thread);
 338                 pthread_join(sr_thread, NULL);
 339         }
 340
 341         for (l = config_devices; l; l = l->next) {
 342                 cfdev = l->data;
 343                 free(cfdev->name);
 344                 free(cfdev->driver);
 345                 free(cfdev->conn);
 346                 free(cfdev->serialcomm);
 347                 free(cfdev);
 348         }
 349         g_slist_free(config_devices);
 350
 351         return 0;
 352 }
 353
 354 void module_register(void)
 355 {
 356
 357         plugin_register_complex_config("sigrok", sigrok_config);
 358         plugin_register_init("sigrok", sigrok_init);
 359         plugin_register_shutdown("sigrok", sigrok_shutdown);
 360
 361 }