session.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <glib.h>
  22 #include <glib/gstdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include "sigrok-cli.h"
  26
  27 static uint64_t limit_samples = 0;
  28 static uint64_t limit_frames = 0;
  29
  30 #ifdef HAVE_SRD
  31 extern struct srd_session *srd_sess;
  32 #endif
  33
  34 static int set_limit_time(const struct sr_dev_inst *sdi)
  35 {
  36         GVariant *gvar;
  37         uint64_t time_msec;
  38         uint64_t samplerate;
  39         struct sr_dev_driver *driver;
  40
  41         driver = sr_dev_inst_driver_get(sdi);
  42
  43         if (!(time_msec = sr_parse_timestring(opt_time))) {
  44                 g_critical("Invalid time '%s'", opt_time);
  45                 return SR_ERR;
  46         }
  47
  48         if (sr_dev_config_capabilities_list(sdi, NULL, SR_CONF_LIMIT_MSEC)
  49                         & SR_CONF_SET) {
  50                 gvar = g_variant_new_uint64(time_msec);
  51                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_MSEC, gvar) != SR_OK) {
  52                         g_critical("Failed to configure time limit.");
  53                         return SR_ERR;
  54                 }
  55         } else if (sr_dev_config_capabilities_list(sdi, NULL, SR_CONF_SAMPLERATE)
  56                         & (SR_CONF_GET | SR_CONF_SET)) {
  57                 /* Convert to samples based on the samplerate. */
  58                 sr_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE, &gvar);
  59                 samplerate = g_variant_get_uint64(gvar);
  60                 g_variant_unref(gvar);
  61                 limit_samples = (samplerate) * time_msec / (uint64_t)1000;
  62                 if (limit_samples == 0) {
  63                         g_critical("Not enough time at this samplerate.");
  64                         return SR_ERR;
  65                 }
  66                 gvar = g_variant_new_uint64(limit_samples);
  67                 if (sr_config_set(sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
  68                         g_critical("Failed to configure time-based sample limit.");
  69                         return SR_ERR;
  70                 }
  71         } else {
  72                 g_critical("This device does not support time limits.");
  73                 return SR_ERR;
  74         }
  75
  76         return SR_OK;
  77 }
  78
  79 const struct sr_output *setup_output_format(const struct sr_dev_inst *sdi, FILE **outfile)
  80 {
  81         const struct sr_output_module *omod;
  82         const struct sr_option **options;
  83         const struct sr_output *o;
  84         GHashTable *fmtargs, *fmtopts;
  85         char *fmtspec;
  86
  87         if (!opt_output_format) {
  88                 if (opt_output_file) {
  89                         opt_output_format = DEFAULT_OUTPUT_FORMAT_FILE;
  90                 } else {
  91                         opt_output_format = DEFAULT_OUTPUT_FORMAT_NOFILE;
  92                 }
  93         }
  94
  95         fmtargs = parse_generic_arg(opt_output_format, TRUE);
  96         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
  97         if (!fmtspec)
  98                 g_critical("Invalid output format.");
  99         if (!(omod = sr_output_find(fmtspec)))
 100                 g_critical("Unknown output module '%s'.", fmtspec);
 101         g_hash_table_remove(fmtargs, "sigrok_key");
 102         if ((options = sr_output_options_get(omod))) {
 103                 fmtopts = generic_arg_to_opt(options, fmtargs);
 104                 sr_output_options_free(options);
 105         } else
 106                 fmtopts = NULL;
 107         o = sr_output_new(omod, fmtopts, sdi, opt_output_file);
 108
 109         if (opt_output_file) {
 110                 if (!sr_output_test_flag(omod, SR_OUTPUT_INTERNAL_IO_HANDLING))
 111                         *outfile = g_fopen(opt_output_file, "wb");
 112                 else
 113                         *outfile = NULL;
 114         } else {
 115                 *outfile = stdout;
 116         }
 117
 118         if (fmtopts)
 119                 g_hash_table_destroy(fmtopts);
 120         g_hash_table_destroy(fmtargs);
 121
 122         return o;
 123 }
 124
 125 const struct sr_transform *setup_transform_module(const struct sr_dev_inst *sdi)
 126 {
 127         const struct sr_transform_module *tmod;
 128         const struct sr_option **options;
 129         const struct sr_transform *t;
 130         GHashTable *fmtargs, *fmtopts;
 131         char *fmtspec;
 132
 133         fmtargs = parse_generic_arg(opt_transform_module, TRUE);
 134         fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 135         if (!fmtspec)
 136                 g_critical("Invalid transform module.");
 137         if (!(tmod = sr_transform_find(fmtspec)))
 138                 g_critical("Unknown transform module '%s'.", fmtspec);
 139         g_hash_table_remove(fmtargs, "sigrok_key");
 140         if ((options = sr_transform_options_get(tmod))) {
 141                 fmtopts = generic_arg_to_opt(options, fmtargs);
 142                 sr_transform_options_free(options);
 143         } else
 144                 fmtopts = NULL;
 145         t = sr_transform_new(tmod, fmtopts, sdi);
 146         if (fmtopts)
 147                 g_hash_table_destroy(fmtopts);
 148         g_hash_table_destroy(fmtargs);
 149
 150         return t;
 151 }
 152
 153 /* Get the input stream's list of channels and their types, once. */
 154 static void props_get_channels(struct df_arg_desc *args,
 155         const struct sr_dev_inst *sdi)
 156 {
 157         struct input_stream_props *props;
 158         GSList *l;
 159         const struct sr_channel *ch;
 160
 161         if (!args)
 162                 return;
 163         props = &args->props;
 164         if (props->channels)
 165                 return;
 166
 167         props->channels = g_slist_copy(sr_dev_inst_channels_get(sdi));
 168         if (!props->channels)
 169                 return;
 170         for (l = props->channels; l; l = l->next) {
 171                 ch = l->data;
 172                 if (!ch->enabled)
 173                         continue;
 174                 if (ch->type != SR_CHANNEL_ANALOG)
 175                         continue;
 176                 props->first_analog_channel = ch;
 177                 break;
 178         }
 179 }
 180
 181 static gboolean props_chk_1st_channel(struct df_arg_desc *args,
 182         const struct sr_datafeed_analog *analog)
 183 {
 184         struct sr_channel *ch;
 185
 186         if (!args || !analog || !analog->meaning)
 187                 return FALSE;
 188         ch = g_slist_nth_data(analog->meaning->channels, 0);
 189         if (!ch)
 190                 return FALSE;
 191         return ch == args->props.first_analog_channel;
 192 }
 193
 194 static void props_dump_details(struct df_arg_desc *args)
 195 {
 196         struct input_stream_props *props;
 197         size_t ch_count;
 198         GSList *l;
 199         const struct sr_channel *ch;
 200         const char *type;
 201
 202         if (!args)
 203                 return;
 204         props = &args->props;
 205         if (props->samplerate)
 206                 printf("Samplerate: %" PRIu64 "\n", props->samplerate);
 207         if (props->channels) {
 208                 ch_count = g_slist_length(props->channels);
 209                 printf("Channels: %zu\n", ch_count);
 210                 for (l = props->channels; l; l = l->next) {
 211                         ch = l->data;
 212                         if (ch->type == SR_CHANNEL_ANALOG)
 213                                 type = "analog";
 214                         else
 215                                 type = "logic";
 216                         printf("- %s: %s\n", ch->name, type);
 217                 }
 218         }
 219         if (props->unitsize)
 220                 printf("Logic unitsize: %zu\n", props->unitsize);
 221         if (props->sample_count_logic)
 222                 printf("Logic sample count: %" PRIu64 "\n", props->sample_count_logic);
 223         if (props->sample_count_analog)
 224                 printf("Analog sample count: %" PRIu64 "\n", props->sample_count_analog);
 225         if (props->frame_count)
 226                 printf("Frame count: %" PRIu64 "\n", props->frame_count);
 227         if (props->triggered)
 228                 printf("Trigger count: %" PRIu64 "\n", props->triggered);
 229 }
 230
 231 static void props_cleanup(struct df_arg_desc *args)
 232 {
 233         struct input_stream_props *props;
 234
 235         if (!args)
 236                 return;
 237         props = &args->props;
 238         g_slist_free(props->channels);
 239         props->channels = NULL;
 240         props->first_analog_channel = NULL;
 241 }
 242
 243 void datafeed_in(const struct sr_dev_inst *sdi,
 244                 const struct sr_datafeed_packet *packet, void *cb_data)
 245 {
 246         static const struct sr_output *o = NULL;
 247         static const struct sr_output *oa = NULL;
 248         static uint64_t rcvd_samples_logic = 0;
 249         static uint64_t rcvd_samples_analog = 0;
 250         static uint64_t samplerate = 0;
 251         static int triggered = 0;
 252         static FILE *outfile = NULL;
 253
 254         const struct sr_datafeed_meta *meta;
 255         const struct sr_datafeed_logic *logic;
 256         const struct sr_datafeed_analog *analog;
 257         struct df_arg_desc *df_arg;
 258         int do_props;
 259         struct input_stream_props *props;
 260         struct sr_session *session;
 261         struct sr_config *src;
 262         GSList *l;
 263         GString *out;
 264         GVariant *gvar;
 265         uint64_t end_sample;
 266         uint64_t input_len;
 267         struct sr_dev_driver *driver;
 268
 269         /* Avoid warnings when building without decoder support. */
 270         (void)session;
 271         (void)input_len;
 272
 273         driver = sr_dev_inst_driver_get(sdi);
 274
 275         /* Skip all packets before the first header. */
 276         if (packet->type != SR_DF_HEADER && !o)
 277                 return;
 278
 279         /* Prepare to either process data, or "just" gather properties. */
 280         df_arg = cb_data;
 281         session = df_arg->session;
 282         do_props = df_arg->do_props;
 283         props = &df_arg->props;
 284
 285         switch (packet->type) {
 286         case SR_DF_HEADER:
 287                 g_debug("cli: Received SR_DF_HEADER.");
 288                 if (maybe_config_get(driver, sdi, NULL, SR_CONF_SAMPLERATE,
 289                                 &gvar) == SR_OK) {
 290                         samplerate = g_variant_get_uint64(gvar);
 291                         g_variant_unref(gvar);
 292                 }
 293                 if (do_props) {
 294                         /* Setup variables for maximum code path re-use. */
 295                         o = (void *)-1;
 296                         limit_samples = 0;
 297                         /* Start collecting input stream properties. */
 298                         memset(props, 0, sizeof(*props));
 299                         props->samplerate = samplerate;
 300                         props_get_channels(df_arg, sdi);
 301                         break;
 302                 }
 303                 if (!(o = setup_output_format(sdi, &outfile)))
 304                         g_critical("Failed to initialize output module.");
 305
 306                 /* Set up backup analog output module. */
 307                 if (outfile)
 308                         oa = sr_output_new(sr_output_find("analog"), NULL,
 309                                         sdi, NULL);
 310
 311                 rcvd_samples_logic = rcvd_samples_analog = 0;
 312
 313 #ifdef HAVE_SRD
 314                 if (opt_pds) {
 315                         if (samplerate) {
 316                                 if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 317                                                 g_variant_new_uint64(samplerate)) != SRD_OK) {
 318                                         g_critical("Failed to configure decode session.");
 319                                         break;
 320                                 }
 321                         }
 322                         if (srd_session_start(srd_sess) != SRD_OK) {
 323                                 g_critical("Failed to start decode session.");
 324                                 break;
 325                         }
 326                 }
 327 #endif
 328                 break;
 329
 330         case SR_DF_META:
 331                 g_debug("cli: Received SR_DF_META.");
 332                 meta = packet->payload;
 333                 for (l = meta->config; l; l = l->next) {
 334                         src = l->data;
 335                         switch (src->key) {
 336                         case SR_CONF_SAMPLERATE:
 337                                 samplerate = g_variant_get_uint64(src->data);
 338                                 g_debug("cli: Got samplerate %"PRIu64" Hz.", samplerate);
 339                                 if (do_props) {
 340                                         props->samplerate = samplerate;
 341                                         break;
 342                                 }
 343 #ifdef HAVE_SRD
 344                                 if (opt_pds) {
 345                                         if (srd_session_metadata_set(srd_sess, SRD_CONF_SAMPLERATE,
 346                                                         g_variant_new_uint64(samplerate)) != SRD_OK) {
 347                                                 g_critical("Failed to pass samplerate to decoder.");
 348                                         }
 349                                 }
 350 #endif
 351                                 break;
 352                         case SR_CONF_SAMPLE_INTERVAL:
 353                                 samplerate = g_variant_get_uint64(src->data);
 354                                 g_debug("cli: Got sample interval %"PRIu64" ms.", samplerate);
 355                                 if (do_props) {
 356                                         props->samplerate = samplerate;
 357                                         break;
 358                                 }
 359                                 break;
 360                         default:
 361                                 /* Unknown metadata is not an error. */
 362                                 break;
 363                         }
 364                 }
 365                 break;
 366
 367         case SR_DF_TRIGGER:
 368                 g_debug("cli: Received SR_DF_TRIGGER.");
 369                 if (do_props) {
 370                         props->triggered++;
 371                         break;
 372                 }
 373                 triggered = 1;
 374                 break;
 375
 376         case SR_DF_LOGIC:
 377                 logic = packet->payload;
 378                 g_message("cli: Received SR_DF_LOGIC (%"PRIu64" bytes, unitsize = %d).",
 379                                 logic->length, logic->unitsize);
 380                 if (logic->length == 0)
 381                         break;
 382
 383                 if (do_props) {
 384                         props_get_channels(df_arg, sdi);
 385                         props->unitsize = logic->unitsize;
 386                         props->sample_count_logic += logic->length / logic->unitsize;
 387                         break;
 388                 }
 389
 390                 /* Don't store any samples until triggered. */
 391                 if (opt_wait_trigger && !triggered)
 392                         break;
 393
 394                 if (limit_samples && rcvd_samples_logic >= limit_samples)
 395                         break;
 396
 397                 end_sample = rcvd_samples_logic + logic->length / logic->unitsize;
 398                 /* Cut off last packet according to the sample limit. */
 399                 if (limit_samples && end_sample > limit_samples)
 400                         end_sample = limit_samples;
 401                 input_len = (end_sample - rcvd_samples_logic) * logic->unitsize;
 402
 403                 if (opt_pds) {
 404 #ifdef HAVE_SRD
 405                         if (srd_session_send(srd_sess, rcvd_samples_logic, end_sample,
 406                                         logic->data, input_len, logic->unitsize) != SRD_OK)
 407                                 sr_session_stop(session);
 408 #endif
 409                 }
 410
 411                 rcvd_samples_logic = end_sample;
 412                 break;
 413
 414         case SR_DF_ANALOG:
 415                 analog = packet->payload;
 416                 g_message("cli: Received SR_DF_ANALOG (%d samples).", analog->num_samples);
 417                 if (analog->num_samples == 0)
 418                         break;
 419
 420                 if (do_props) {
 421                         /* Only count the first analog channel. */
 422                         props_get_channels(df_arg, sdi);
 423                         if (!props_chk_1st_channel(df_arg, analog))
 424                                 break;
 425                         props->sample_count_analog += analog->num_samples;
 426                         break;
 427                 }
 428
 429                 if (limit_samples && rcvd_samples_analog >= limit_samples)
 430                         break;
 431
 432                 rcvd_samples_analog += analog->num_samples;
 433                 break;
 434
 435         case SR_DF_FRAME_BEGIN:
 436                 g_debug("cli: Received SR_DF_FRAME_BEGIN.");
 437                 break;
 438
 439         case SR_DF_FRAME_END:
 440                 g_debug("cli: Received SR_DF_FRAME_END.");
 441                 if (do_props) {
 442                         props->frame_count++;
 443                         break;
 444                 }
 445                 break;
 446
 447         default:
 448                 break;
 449         }
 450
 451         if (!do_props && o && !opt_pds) {
 452                 if (sr_output_send(o, packet, &out) == SR_OK) {
 453                         if (oa && !out) {
 454                                 /*
 455                                  * The user didn't specify an output module,
 456                                  * but needs to see this analog data.
 457                                  */
 458                                 sr_output_send(oa, packet, &out);
 459                         }
 460                         if (outfile && out && out->len > 0) {
 461                                 fwrite(out->str, 1, out->len, outfile);
 462                                 fflush(outfile);
 463                         }
 464                         if (out)
 465                                 g_string_free(out, TRUE);
 466                 }
 467         }
 468
 469         /*
 470          * SR_DF_END needs to be handled after the output module's receive()
 471          * is called, so it can properly clean up that module.
 472          */
 473         if (packet->type == SR_DF_END) {
 474                 g_debug("cli: Received SR_DF_END.");
 475
 476                 if (do_props) {
 477                         props_dump_details(df_arg);
 478                         props_cleanup(df_arg);
 479                         o = NULL;
 480                 }
 481
 482                 if (o)
 483                         sr_output_free(o);
 484                 o = NULL;
 485
 486                 if (oa)
 487                         sr_output_free(oa);
 488                 oa = NULL;
 489
 490                 if (outfile && outfile != stdout)
 491                         fclose(outfile);
 492
 493                 if (limit_samples) {
 494                         if (rcvd_samples_logic > 0 && rcvd_samples_logic < limit_samples)
 495                                 g_warning("Device only sent %" PRIu64 " samples.",
 496                                            rcvd_samples_logic);
 497                         else if (rcvd_samples_analog > 0 && rcvd_samples_analog < limit_samples)
 498                                 g_warning("Device only sent %" PRIu64 " samples.",
 499                                            rcvd_samples_analog);
 500                 }
 501         }
 502
 503 }
 504
 505 int opt_to_gvar(char *key, char *value, struct sr_config *src)
 506 {
 507         const struct sr_key_info *srci, *srmqi;
 508         double tmp_double, dlow, dhigh;
 509         uint64_t tmp_u64, p, q, low, high, mqflags;
 510         uint32_t mq;
 511         GVariant *rational[2], *range[2], *gtup[2];
 512         GVariantBuilder *vbl;
 513         gboolean tmp_bool;
 514         gchar **keyval;
 515         int ret, i;
 516
 517         if (!(srci = sr_key_info_name_get(SR_KEY_CONFIG, key))) {
 518                 g_critical("Unknown device option '%s'.", (char *) key);
 519                 return -1;
 520         }
 521         src->key = srci->key;
 522
 523         if ((!value || strlen(value) == 0) &&
 524                 (srci->datatype != SR_T_BOOL)) {
 525                 g_critical("Option '%s' needs a value.", (char *)key);
 526                 return -1;
 527         }
 528
 529         ret = 0;
 530         switch (srci->datatype) {
 531         case SR_T_UINT64:
 532                 ret = sr_parse_sizestring(value, &tmp_u64);
 533                 if (ret != 0)
 534                         break;
 535                 src->data = g_variant_new_uint64(tmp_u64);
 536                 break;
 537         case SR_T_INT32:
 538                 ret = sr_parse_sizestring(value, &tmp_u64);
 539                 if (ret != 0)
 540                         break;
 541                 src->data = g_variant_new_int32(tmp_u64);
 542                 break;
 543         case SR_T_STRING:
 544                 src->data = g_variant_new_string(value);
 545                 break;
 546         case SR_T_BOOL:
 547                 if (!value)
 548                         tmp_bool = TRUE;
 549                 else
 550                         tmp_bool = sr_parse_boolstring(value);
 551                 src->data = g_variant_new_boolean(tmp_bool);
 552                 break;
 553         case SR_T_FLOAT:
 554                 tmp_double = strtof(value, NULL);
 555                 src->data = g_variant_new_double(tmp_double);
 556                 break;
 557         case SR_T_RATIONAL_PERIOD:
 558                 if ((ret = sr_parse_period(value, &p, &q)) != SR_OK)
 559                         break;
 560                 rational[0] = g_variant_new_uint64(p);
 561                 rational[1] = g_variant_new_uint64(q);
 562                 src->data = g_variant_new_tuple(rational, 2);
 563                 break;
 564         case SR_T_RATIONAL_VOLT:
 565                 if ((ret = sr_parse_voltage(value, &p, &q)) != SR_OK)
 566                         break;
 567                 rational[0] = g_variant_new_uint64(p);
 568                 rational[1] = g_variant_new_uint64(q);
 569                 src->data = g_variant_new_tuple(rational, 2);
 570                 break;
 571         case SR_T_UINT64_RANGE:
 572                 if (sscanf(value, "%"PRIu64"-%"PRIu64, &low, &high) != 2) {
 573                         ret = -1;
 574                         break;
 575                 } else {
 576                         range[0] = g_variant_new_uint64(low);
 577                         range[1] = g_variant_new_uint64(high);
 578                         src->data = g_variant_new_tuple(range, 2);
 579                 }
 580                 break;
 581         case SR_T_DOUBLE_RANGE:
 582                 if (sscanf(value, "%lf-%lf", &dlow, &dhigh) != 2) {
 583                         ret = -1;
 584                         break;
 585                 } else {
 586                         range[0] = g_variant_new_double(dlow);
 587                         range[1] = g_variant_new_double(dhigh);
 588                         src->data = g_variant_new_tuple(range, 2);
 589                 }
 590                 break;
 591         case SR_T_KEYVALUE:
 592                 /* Expects the argument to be in the form of key=value. */
 593                 keyval = g_strsplit(value, "=", 2);
 594                 if (!keyval[0] || !keyval[1]) {
 595                         g_strfreev(keyval);
 596                         ret = -1;
 597                         break;
 598                 } else {
 599                         vbl = g_variant_builder_new(G_VARIANT_TYPE_DICTIONARY);
 600                         g_variant_builder_add(vbl, "{ss}",
 601                                               keyval[0], keyval[1]);
 602                         src->data = g_variant_builder_end(vbl);
 603                         g_strfreev(keyval);
 604                 }
 605                 break;
 606         case SR_T_MQ:
 607                 /*
 608                   Argument is MQ id e.g. ("voltage") optionally followed by one
 609                   or more /<mqflag> e.g. "/ac".
 610                  */
 611                 keyval = g_strsplit(value, "/", 0);
 612                 if (!keyval[0] || !(srmqi = sr_key_info_name_get(SR_KEY_MQ, keyval[0]))) {
 613                         g_strfreev(keyval);
 614                         ret = -1;
 615                         break;
 616                 }
 617                 mq = srmqi->key;
 618                 mqflags = 0;
 619                 for (i = 1; keyval[i]; i++) {
 620                         if (!(srmqi = sr_key_info_name_get(SR_KEY_MQFLAGS, keyval[i]))) {
 621                                 ret = -1;
 622                                 break;
 623                         }
 624                         mqflags |= srmqi->key;
 625                 }
 626                 g_strfreev(keyval);
 627                 if (ret != -1) {
 628                         gtup[0] = g_variant_new_uint32(mq);
 629                         gtup[1] = g_variant_new_uint64(mqflags);
 630                         src->data = g_variant_new_tuple(gtup, 2);
 631                 }
 632                 break;
 633         default:
 634                 g_critical("Unknown data type specified for option '%s' "
 635                            "(driver implementation bug?).", key);
 636                 ret = -1;
 637         }
 638
 639         if (ret < 0)
 640                 g_critical("Invalid value: '%s' for option '%s'", value, key);
 641
 642         return ret;
 643 }
 644
 645 int set_dev_options(struct sr_dev_inst *sdi, GHashTable *args)
 646 {
 647         struct sr_config src;
 648         struct sr_channel_group *cg;
 649         GHashTableIter iter;
 650         gpointer key, value;
 651         int ret;
 652
 653         g_hash_table_iter_init(&iter, args);
 654         while (g_hash_table_iter_next(&iter, &key, &value)) {
 655                 if ((ret = opt_to_gvar(key, value, &src)) != 0)
 656                         return ret;
 657                 cg = select_channel_group(sdi);
 658                 if ((ret = maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, cg,
 659                                 src.key, src.data)) != SR_OK) {
 660                         g_critical("Failed to set device option '%s': %s.",
 661                                    (char *)key, sr_strerror(ret));
 662                         return ret;
 663                 }
 664         }
 665
 666         return SR_OK;
 667 }
 668
 669 void run_session(void)
 670 {
 671         struct df_arg_desc df_arg;
 672         GSList *devices, *real_devices, *sd;
 673         GHashTable *devargs;
 674         GVariant *gvar;
 675         struct sr_session *session;
 676         struct sr_trigger *trigger;
 677         struct sr_dev_inst *sdi;
 678         uint64_t min_samples, max_samples;
 679         GArray *drv_opts;
 680         guint i;
 681         int is_demo_dev;
 682         struct sr_dev_driver *driver;
 683         const struct sr_transform *t;
 684         GMainLoop *main_loop;
 685
 686         memset(&df_arg, 0, sizeof(df_arg));
 687         df_arg.do_props = FALSE;
 688
 689         devices = device_scan();
 690         if (!devices) {
 691                 g_critical("No devices found.");
 692                 return;
 693         }
 694
 695         real_devices = NULL;
 696         for (sd = devices; sd; sd = sd->next) {
 697                 sdi = sd->data;
 698
 699                 driver = sr_dev_inst_driver_get(sdi);
 700
 701                 if (!(drv_opts = sr_dev_options(driver, NULL, NULL))) {
 702                         g_critical("Failed to query list of driver options.");
 703                         return;
 704                 }
 705
 706                 is_demo_dev = 0;
 707                 for (i = 0; i < drv_opts->len; i++) {
 708                         if (g_array_index(drv_opts, uint32_t, i) == SR_CONF_DEMO_DEV)
 709                                 is_demo_dev = 1;
 710                 }
 711
 712                 g_array_free(drv_opts, TRUE);
 713
 714                 if (!is_demo_dev)
 715                         real_devices = g_slist_append(real_devices, sdi);
 716         }
 717
 718         if (g_slist_length(devices) > 1) {
 719                 if (g_slist_length(real_devices) != 1) {
 720                         g_critical("sigrok-cli only supports one device for capturing.");
 721                         return;
 722                 } else {
 723                         /* We only have one non-demo device. */
 724                         g_slist_free(devices);
 725                         devices = real_devices;
 726                         real_devices = NULL;
 727                 }
 728         }
 729
 730         /* This is unlikely to happen but it makes static analyzers stop complaining. */
 731         if (!devices) {
 732                 g_critical("No real devices found.");
 733                 return;
 734         }
 735
 736         sdi = devices->data;
 737         g_slist_free(devices);
 738         g_slist_free(real_devices);
 739
 740         sr_session_new(sr_ctx, &session);
 741         df_arg.session = session;
 742         sr_session_datafeed_callback_add(session, datafeed_in, &df_arg);
 743         df_arg.session = NULL;
 744
 745         if (sr_dev_open(sdi) != SR_OK) {
 746                 g_critical("Failed to open device.");
 747                 return;
 748         }
 749
 750         if (sr_session_dev_add(session, sdi) != SR_OK) {
 751                 g_critical("Failed to add device to session.");
 752                 sr_session_destroy(session);
 753                 return;
 754         }
 755
 756         if (opt_config) {
 757                 if ((devargs = parse_generic_arg(opt_config, FALSE))) {
 758                         if (set_dev_options(sdi, devargs) != SR_OK)
 759                                 return;
 760                         g_hash_table_destroy(devargs);
 761                 }
 762         }
 763
 764         if (select_channels(sdi) != SR_OK) {
 765                 g_critical("Failed to set channels.");
 766                 sr_session_destroy(session);
 767                 return;
 768         }
 769
 770         trigger = NULL;
 771         if (opt_triggers) {
 772                 if (!parse_triggerstring(sdi, opt_triggers, &trigger)) {
 773                         sr_session_destroy(session);
 774                         return;
 775                 }
 776                 if (sr_session_trigger_set(session, trigger) != SR_OK) {
 777                         sr_session_destroy(session);
 778                         return;
 779                 }
 780         }
 781
 782         if (opt_continuous) {
 783                 if (!sr_dev_has_option(sdi, SR_CONF_CONTINUOUS)) {
 784                         g_critical("This device does not support continuous sampling.");
 785                         sr_session_destroy(session);
 786                         return;
 787                 }
 788         }
 789
 790         if (opt_time) {
 791                 if (set_limit_time(sdi) != SR_OK) {
 792                         sr_session_destroy(session);
 793                         return;
 794                 }
 795         }
 796
 797         if (opt_samples) {
 798                 if ((sr_parse_sizestring(opt_samples, &limit_samples) != SR_OK)) {
 799                         g_critical("Invalid sample limit '%s'.", opt_samples);
 800                         sr_session_destroy(session);
 801                         return;
 802                 }
 803                 if (maybe_config_list(driver, sdi, NULL, SR_CONF_LIMIT_SAMPLES,
 804                                 &gvar) == SR_OK) {
 805                         /*
 806                          * The device has no compression, or compression is turned
 807                          * off, and publishes its sample memory size.
 808                          */
 809                         g_variant_get(gvar, "(tt)", &min_samples, &max_samples);
 810                         g_variant_unref(gvar);
 811                         if (limit_samples < min_samples) {
 812                                 g_critical("The device stores at least %"PRIu64
 813                                                 " samples with the current settings.", min_samples);
 814                         }
 815                         if (limit_samples > max_samples) {
 816                                 g_critical("The device can store only %"PRIu64
 817                                                 " samples with the current settings.", max_samples);
 818                         }
 819                 }
 820                 gvar = g_variant_new_uint64(limit_samples);
 821                 if (maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, NULL, SR_CONF_LIMIT_SAMPLES, gvar) != SR_OK) {
 822                         g_critical("Failed to configure sample limit.");
 823                         sr_session_destroy(session);
 824                         return;
 825                 }
 826         }
 827
 828         if (opt_frames) {
 829                 if ((sr_parse_sizestring(opt_frames, &limit_frames) != SR_OK)) {
 830                         g_critical("Invalid frame limit '%s'.", opt_frames);
 831                         sr_session_destroy(session);
 832                         return;
 833                 }
 834                 gvar = g_variant_new_uint64(limit_frames);
 835                 if (maybe_config_set(sr_dev_inst_driver_get(sdi), sdi, NULL, SR_CONF_LIMIT_FRAMES, gvar) != SR_OK) {
 836                         g_critical("Failed to configure frame limit.");
 837                         sr_session_destroy(session);
 838                         return;
 839                 }
 840         }
 841
 842         if (opt_transform_module) {
 843                 if (!(t = setup_transform_module(sdi)))
 844                         g_critical("Failed to initialize transform module.");
 845         }
 846
 847         main_loop = g_main_loop_new(NULL, FALSE);
 848
 849         sr_session_stopped_callback_set(session,
 850                 (sr_session_stopped_callback)g_main_loop_quit, main_loop);
 851
 852         if (sr_session_start(session) != SR_OK) {
 853                 g_critical("Failed to start session.");
 854                 g_main_loop_unref(main_loop);
 855                 sr_session_destroy(session);
 856                 return;
 857         }
 858
 859         if (opt_continuous)
 860                 add_anykey(session);
 861
 862         g_main_loop_run(main_loop);
 863
 864         if (opt_continuous)
 865                 clear_anykey();
 866
 867         if (trigger)
 868                 sr_trigger_free(trigger);
 869
 870         sr_session_datafeed_callback_remove_all(session);
 871         g_main_loop_unref(main_loop);
 872         sr_session_destroy(session);
 873 }