hardware/hameg-hmo/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 poljar (Damir Jelić) <poljarinho@gmail.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 <stdlib.h>
  21 #include <glib/gstdio.h>
  22 #include "protocol.h"
  23
  24 #define SERIALCOMM "115200/8n1/flow=1"
  25
  26 static const int32_t hwopts[] = {
  27         SR_CONF_CONN,
  28         SR_CONF_SERIALCOMM,
  29 };
  30
  31 struct usb_id_info {
  32         uint16_t vendor_id;
  33         uint16_t product_id;
  34 };
  35
  36 static struct usb_id_info ho_models[] = {
  37         { 0x0403, 0xed72 }, /* HO720 */
  38         { 0x0403, 0xed73 }, /* HO730 */
  39 };
  40
  41 enum {
  42         PG_INVALID = -1,
  43         PG_NONE,
  44         PG_ANALOG,
  45         PG_DIGITAL,
  46 };
  47
  48 static int init(struct sr_context *sr_ctx)
  49 {
  50         return std_init(sr_ctx, di, LOG_PREFIX);
  51 }
  52
  53 /**
  54  * Find USB serial devices via the USB vendor ID and product ID.
  55  *
  56  * @param vendor_id Vendor ID of the USB device.
  57  * @param product_id Product ID of the USB device.
  58  *
  59  * @return A GSList of strings containing the path of the serial device or
  60  *         NULL if no serial device is found. The returned list must be freed
  61  *         by the caller.
  62  */
  63 static GSList *auto_find_usb(uint16_t vendor_id, uint16_t product_id)
  64 {
  65 #ifdef __linux__
  66         const gchar *usb_dev;
  67         const char device_tree[] = "/sys/bus/usb/devices/";
  68         GDir *devices_dir, *device_dir;
  69         GSList *l = NULL;
  70         GSList *tty_devs;
  71         GSList *matched_paths;
  72         FILE *fd;
  73         char tmp[5];
  74         gchar *vendor_path, *product_path, *path_copy;
  75         gchar *prefix, *subdir_path, *device_path, *tty_path;
  76         unsigned long read_vendor_id, read_product_id;
  77         const char *file;
  78
  79         l = NULL;
  80         tty_devs = NULL;
  81         matched_paths = NULL;
  82
  83         if (!(devices_dir = g_dir_open(device_tree, 0, NULL)))
  84                 return NULL;
  85
  86         /*
  87          * Find potential candidates using the vendor ID and product ID
  88          * and store them in matched_paths.
  89          */
  90         while ((usb_dev = g_dir_read_name(devices_dir))) {
  91                 vendor_path = g_strconcat(device_tree,
  92                                           usb_dev, "/idVendor", NULL);
  93                 product_path = g_strconcat(device_tree,
  94                                            usb_dev, "/idProduct", NULL);
  95
  96                 if (!g_file_test(vendor_path, G_FILE_TEST_EXISTS) ||
  97                     !g_file_test(product_path, G_FILE_TEST_EXISTS))
  98                         goto skip_device;
  99
 100                 if ((fd = g_fopen(vendor_path, "r")) == NULL)
 101                         goto skip_device;
 102
 103                 if (fgets(tmp, sizeof(tmp), fd) == NULL) {
 104                         fclose(fd);
 105                         goto skip_device;
 106                 }
 107                 read_vendor_id = strtoul(tmp, NULL, 16);
 108
 109                 fclose(fd);
 110
 111                 if ((fd = g_fopen(product_path, "r")) == NULL)
 112                         goto skip_device;
 113
 114                 if (fgets(tmp, sizeof(tmp), fd) == NULL) {
 115                         fclose(fd);
 116                         goto skip_device;
 117                 }
 118                 read_product_id = strtoul(tmp, NULL, 16);
 119
 120                 fclose(fd);
 121
 122                 if (vendor_id == read_vendor_id &&
 123                     product_id == read_product_id) {
 124                         path_copy = g_strdup(usb_dev);
 125                         matched_paths = g_slist_prepend(matched_paths,
 126                                                         path_copy);
 127                 }
 128
 129 skip_device:
 130                 g_free(vendor_path);
 131                 g_free(product_path);
 132         }
 133         g_dir_close(devices_dir);
 134
 135         /* For every matched device try to find a ttyUSBX subfolder. */
 136         for (l = matched_paths; l; l = l->next) {
 137                 subdir_path = NULL;
 138
 139                 device_path = g_strconcat(device_tree, l->data, NULL);
 140
 141                 if (!(device_dir = g_dir_open(device_path, 0, NULL))) {
 142                         g_free(device_path);
 143                         continue;
 144                 }
 145
 146                 prefix = g_strconcat(l->data, ":", NULL);
 147
 148                 while ((file = g_dir_read_name(device_dir))) {
 149                         if (g_str_has_prefix(file, prefix)) {
 150                                 subdir_path = g_strconcat(device_path,
 151                                                 "/", file, NULL);
 152                                 break;
 153                         }
 154                 }
 155                 g_dir_close(device_dir);
 156
 157                 g_free(prefix);
 158                 g_free(device_path);
 159
 160                 if (subdir_path) {
 161                         if (!(device_dir = g_dir_open(subdir_path, 0, NULL))) {
 162                                 g_free(subdir_path);
 163                                 continue;
 164                         }
 165                         g_free(subdir_path);
 166
 167                         while ((file = g_dir_read_name(device_dir))) {
 168                                 if (g_str_has_prefix(file, "ttyUSB")) {
 169                                         tty_path = g_strconcat("/dev/",
 170                                                                file, NULL);
 171                                         sr_dbg("Found USB device %04x:%04x attached to %s.",
 172                                                vendor_id, product_id, tty_path);
 173                                         tty_devs = g_slist_prepend(tty_devs,
 174                                                         tty_path);
 175                                         break;
 176                                 }
 177                         }
 178                         g_dir_close(device_dir);
 179                 }
 180         }
 181         g_slist_free_full(matched_paths, g_free);
 182
 183         return tty_devs;
 184 #else
 185         return NULL;
 186 #endif
 187 }
 188
 189 static GSList *scan(GSList *options)
 190 {
 191         GSList *devices;
 192         struct drv_context *drvc;
 193         struct sr_dev_inst *sdi;
 194         const char *serial_device, *serial_options;
 195         GSList *l, *tty_devs;
 196         unsigned int i;
 197
 198         serial_device = NULL;
 199         serial_options = SERIALCOMM;
 200         sdi = NULL;
 201         devices = NULL;
 202         drvc = di->priv;
 203         drvc->instances = NULL;
 204
 205         if (sr_serial_extract_options(options, &serial_device,
 206                                       &serial_options) == SR_OK) {
 207                 sdi = hmo_probe_serial_device(serial_device, serial_options);
 208                 if (sdi != NULL) {
 209                         devices = g_slist_append(devices, sdi);
 210                         drvc->instances = g_slist_append(drvc->instances, sdi);
 211                 }
 212         } else {
 213                 tty_devs = NULL;
 214
 215                 for (i = 0; i < ARRAY_SIZE(ho_models); i++) {
 216                         if ((l = auto_find_usb(ho_models[i].vendor_id,
 217                                            ho_models[i].product_id)) == NULL)
 218                                 continue;
 219                         tty_devs = g_slist_concat(tty_devs, l);
 220                 }
 221
 222                 for (l = tty_devs; l; l = l->next) {
 223                         sdi = hmo_probe_serial_device(l->data, serial_options);
 224                         if (sdi != NULL) {
 225                                 devices = g_slist_append(devices, sdi);
 226                                 drvc->instances = g_slist_append(drvc->instances, sdi);
 227                         }
 228                 }
 229
 230                 g_slist_free_full(tty_devs, g_free);
 231         }
 232
 233         return devices;
 234 }
 235
 236 static GSList *dev_list(void)
 237 {
 238         return ((struct drv_context *)(di->priv))->instances;
 239 }
 240
 241 static void clear_helper(void *priv)
 242 {
 243         unsigned int i;
 244         struct dev_context *devc;
 245         struct scope_config *model;
 246
 247         devc = priv;
 248         model = devc->model_config;
 249
 250         hmo_scope_state_free(devc->model_state);
 251
 252         for (i = 0; i < model->analog_channels; ++i)
 253                 g_slist_free(devc->analog_groups[i].probes);
 254
 255         for (i = 0; i < model->digital_pods; ++i) {
 256                 g_slist_free(devc->digital_groups[i].probes);
 257                 g_free(devc->digital_groups[i].name);
 258         }
 259
 260         g_free(devc->analog_groups);
 261         g_free(devc->digital_groups);
 262
 263         g_free(devc);
 264 }
 265
 266 static int dev_clear(void)
 267 {
 268         return std_dev_clear(di, clear_helper);
 269 }
 270
 271 static int dev_open(struct sr_dev_inst *sdi)
 272 {
 273         if (sdi->status != SR_ST_ACTIVE && sr_scpi_open(sdi->conn) != SR_OK)
 274                 return SR_ERR;
 275
 276         if (hmo_scope_state_get(sdi) != SR_OK)
 277                 return SR_ERR;
 278
 279         sdi->status = SR_ST_ACTIVE;
 280
 281         return SR_OK;
 282 }
 283
 284 static int dev_close(struct sr_dev_inst *sdi)
 285 {
 286         if (sdi->status == SR_ST_INACTIVE)
 287                 return SR_OK;
 288
 289         sr_scpi_close(sdi->conn);
 290
 291         sdi->status = SR_ST_INACTIVE;
 292
 293         return SR_OK;
 294 }
 295
 296 static int cleanup(void)
 297 {
 298         dev_clear();
 299
 300         return SR_OK;
 301 }
 302
 303 static int check_probe_group(struct dev_context *devc,
 304                              const struct sr_probe_group *probe_group)
 305 {
 306         unsigned int i;
 307         struct scope_config *model;
 308
 309         model = devc->model_config;
 310
 311         if (!probe_group)
 312                 return PG_NONE;
 313
 314         for (i = 0; i < model->analog_channels; ++i)
 315                 if (probe_group == &devc->analog_groups[i])
 316                         return PG_ANALOG;
 317
 318         for (i = 0; i < model->digital_pods; ++i)
 319                 if (probe_group == &devc->digital_groups[i])
 320                         return PG_DIGITAL;
 321
 322         sr_err("Invalid probe group specified.");
 323
 324         return PG_INVALID;
 325 }
 326
 327 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 328                       const struct sr_probe_group *probe_group)
 329 {
 330         int ret, pg_type;
 331         unsigned int i;
 332         struct dev_context *devc;
 333         struct scope_config *model;
 334
 335         if (!sdi || !(devc = sdi->priv))
 336                 return SR_ERR_ARG;
 337
 338         if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
 339                 return SR_ERR;
 340
 341         ret = SR_ERR_NA;
 342         model = devc->model_config;
 343
 344         switch (key) {
 345         case SR_CONF_NUM_TIMEBASE:
 346                 *data = g_variant_new_int32(model->num_xdivs);
 347                 ret = SR_OK;
 348                 break;
 349         case SR_CONF_NUM_VDIV:
 350                 if (pg_type == PG_NONE) {
 351                         sr_err("No probe group specified.");
 352                         return SR_ERR_PROBE_GROUP;
 353                 } else if (pg_type == PG_ANALOG) {
 354                         for (i = 0; i < model->analog_channels; ++i) {
 355                                 if (probe_group != &devc->analog_groups[i])
 356                                         continue;
 357                                 *data = g_variant_new_int32(model->num_ydivs);
 358                                 ret = SR_OK;
 359                                 break;
 360                         }
 361
 362                 } else {
 363                         ret = SR_ERR_NA;
 364                 }
 365                 break;
 366         default:
 367                 ret = SR_ERR_NA;
 368         }
 369
 370         return ret;
 371 }
 372
 373 static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 374 {
 375         unsigned int i;
 376         GVariant *rational[2];
 377         GVariantBuilder gvb;
 378
 379         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 380
 381         for (i = 0; i < n; i++) {
 382                 rational[0] = g_variant_new_uint64((*array)[i][0]);
 383                 rational[1] = g_variant_new_uint64((*array)[i][1]);
 384
 385                 /* FIXME: Valgrind reports a memory leak here. */
 386                 g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
 387         }
 388
 389         return g_variant_builder_end(&gvb);
 390 }
 391
 392 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 393                       const struct sr_probe_group *probe_group)
 394 {
 395         int ret, pg_type;
 396         unsigned int i, j;
 397         char command[MAX_COMMAND_SIZE];
 398         struct dev_context *devc;
 399         struct scope_config *model;
 400         struct scope_state *state;
 401         const char *tmp;
 402         uint64_t p, q, tmp_u64;
 403         double tmp_d;
 404
 405         if (!sdi || !(devc = sdi->priv))
 406                 return SR_ERR_ARG;
 407
 408         if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
 409                 return SR_ERR;
 410
 411         model = devc->model_config;
 412         state = devc->model_state;
 413
 414         ret = SR_ERR_NA;
 415
 416         switch (key) {
 417         case SR_CONF_LIMIT_FRAMES:
 418                 devc->frame_limit = g_variant_get_uint64(data);
 419                 ret = SR_OK;
 420                 break;
 421         case SR_CONF_TRIGGER_SOURCE:
 422                 tmp = g_variant_get_string(data, NULL);
 423                 for (i = 0; (*model->trigger_sources)[i]; i++) {
 424                         if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
 425                                 continue;
 426                         state->trigger_source = i;
 427                         g_snprintf(command, sizeof(command),
 428                                    (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
 429                                    (*model->trigger_sources)[i]);
 430
 431                         ret = sr_scpi_send(sdi->conn, command);
 432                         break;
 433                 }
 434                 break;
 435         case SR_CONF_VDIV:
 436                 if (pg_type == PG_NONE) {
 437                         sr_err("No probe group specified.");
 438                         return SR_ERR_PROBE_GROUP;
 439                 }
 440
 441                 g_variant_get(data, "(tt)", &p, &q);
 442
 443                 for (i = 0; i < model->num_vdivs; i++) {
 444                         if (p != (*model->vdivs)[i][0] ||
 445                             q != (*model->vdivs)[i][1])
 446                                 continue;
 447                         for (j = 1; j <= model->analog_channels; ++j) {
 448                                 if (probe_group != &devc->analog_groups[j - 1])
 449                                         continue;
 450                                 state->analog_channels[j - 1].vdiv = (float) p / q;
 451                                 g_snprintf(command, sizeof(command),
 452                                            (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
 453                                            j, state->analog_channels[j-1].vdiv);
 454
 455                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 456                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 457                                         return SR_ERR;
 458
 459                                 break;
 460                         }
 461
 462                         ret = SR_OK;
 463                         break;
 464                 }
 465                 break;
 466         case SR_CONF_TIMEBASE:
 467                 g_variant_get(data, "(tt)", &p, &q);
 468
 469                 for (i = 0; i < model->num_timebases; i++) {
 470                         if (p != (*model->timebases)[i][0] ||
 471                             q != (*model->timebases)[i][1])
 472                                 continue;
 473                         state->timebase = (float) p / q;
 474                         g_snprintf(command, sizeof(command),
 475                                    (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
 476                                    state->timebase);
 477
 478                         ret = sr_scpi_send(sdi->conn, command);
 479                         break;
 480                 }
 481                 break;
 482         case SR_CONF_HORIZ_TRIGGERPOS:
 483                 tmp_d = g_variant_get_double(data);
 484
 485                 if (tmp_d < 0.0 || tmp_d > 1.0)
 486                         return SR_ERR;
 487
 488                 state->horiz_triggerpos = -(tmp_d - 0.5) * state->timebase * model->num_xdivs;
 489                 g_snprintf(command, sizeof(command),
 490                            (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
 491                            state->horiz_triggerpos);
 492
 493                 ret = sr_scpi_send(sdi->conn, command);
 494                 break;
 495         case SR_CONF_TRIGGER_SLOPE:
 496                 tmp_u64 = g_variant_get_uint64(data);
 497
 498                 if (tmp_u64 != 0 && tmp_u64 != 1)
 499                         return SR_ERR;
 500
 501                 state->trigger_slope = tmp_u64;
 502
 503                 g_snprintf(command, sizeof(command),
 504                            (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
 505                            tmp_u64 ? "POS" : "NEG");
 506
 507                 ret = sr_scpi_send(sdi->conn, command);
 508                 break;
 509         case SR_CONF_COUPLING:
 510                 if (pg_type == PG_NONE) {
 511                         sr_err("No probe group specified.");
 512                         return SR_ERR_PROBE_GROUP;
 513                 }
 514
 515                 tmp = g_variant_get_string(data, NULL);
 516
 517                 for (i = 0; (*model->coupling_options)[i]; i++) {
 518                         if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
 519                                 continue;
 520                         for (j = 1; j <= model->analog_channels; ++j) {
 521                                 if (probe_group != &devc->analog_groups[j - 1])
 522                                         continue;
 523                                 state->analog_channels[j-1].coupling = i;
 524
 525                                 g_snprintf(command, sizeof(command),
 526                                            (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
 527                                            j, tmp);
 528
 529                                 if (sr_scpi_send(sdi->conn, command) != SR_OK ||
 530                                     sr_scpi_get_opc(sdi->conn) != SR_OK)
 531                                         return SR_ERR;
 532                                 break;
 533                         }
 534
 535                         ret = SR_OK;
 536                         break;
 537                 }
 538                 break;
 539         default:
 540                 ret = SR_ERR_NA;
 541                 break;
 542         }
 543
 544         if (ret == SR_OK)
 545                 ret = sr_scpi_get_opc(sdi->conn);
 546
 547         return ret;
 548 }
 549
 550 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 551                        const struct sr_probe_group *probe_group)
 552 {
 553         int pg_type;
 554         struct dev_context *devc;
 555         struct scope_config *model;
 556
 557         if (!sdi || !(devc = sdi->priv))
 558                 return SR_ERR_ARG;
 559
 560         if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
 561                 return SR_ERR;
 562
 563         model = devc->model_config;
 564
 565         switch (key) {
 566         case SR_CONF_DEVICE_OPTIONS:
 567                 if (pg_type == PG_NONE) {
 568                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 569                                 model->hw_caps, model->num_hwcaps,
 570                                 sizeof(int32_t));
 571                 } else if (pg_type == PG_ANALOG) {
 572                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 573                                 model->analog_hwcaps, model->num_analog_hwcaps,
 574                                 sizeof(int32_t));
 575                 } else {
 576                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 577                                 NULL, 0, sizeof(int32_t));
 578                 }
 579                 break;
 580         case SR_CONF_COUPLING:
 581                 if (pg_type == PG_NONE)
 582                         return SR_ERR_PROBE_GROUP;
 583                 *data = g_variant_new_strv(*model->coupling_options,
 584                            g_strv_length((char **)*model->coupling_options));
 585                 break;
 586         case SR_CONF_TRIGGER_SOURCE:
 587                 *data = g_variant_new_strv(*model->trigger_sources,
 588                            g_strv_length((char **)*model->trigger_sources));
 589                 break;
 590         case SR_CONF_TIMEBASE:
 591                 *data = build_tuples(model->timebases, model->num_timebases);
 592                 break;
 593         case SR_CONF_VDIV:
 594                 if (pg_type == PG_NONE)
 595                         return SR_ERR_PROBE_GROUP;
 596                 *data = build_tuples(model->vdivs, model->num_vdivs);
 597                 break;
 598         default:
 599                 return SR_ERR_NA;
 600         }
 601
 602         return SR_OK;
 603 }
 604
 605 SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 606 {
 607         char command[MAX_COMMAND_SIZE];
 608         struct sr_probe *probe;
 609         struct dev_context *devc;
 610         struct scope_config *model;
 611
 612         devc = sdi->priv;
 613         model = devc->model_config;
 614
 615         probe = devc->current_probe->data;
 616
 617         switch (probe->type) {
 618         case SR_PROBE_ANALOG:
 619                 g_snprintf(command, sizeof(command),
 620                            (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
 621                            probe->index + 1);
 622                 break;
 623         case SR_PROBE_LOGIC:
 624                 g_snprintf(command, sizeof(command),
 625                            (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
 626                            probe->index < 8 ? 1 : 2);
 627                 break;
 628         default:
 629                 sr_err("Invalid probe type.");
 630                 break;
 631         }
 632
 633         return sr_scpi_send(sdi->conn, command);
 634 }
 635
 636 static int hmo_check_probes(GSList *probes)
 637 {
 638         GSList *l;
 639         struct sr_probe *probe;
 640         gboolean enabled_pod1, enabled_pod2, enabled_chan3, enabled_chan4;
 641
 642         enabled_pod1 = enabled_pod2 = enabled_chan3 = enabled_chan4 = FALSE;
 643
 644         for (l = probes; l; l = l->next) {
 645                 probe = l->data;
 646                 switch (probe->type) {
 647                 case SR_PROBE_ANALOG:
 648                         if (probe->index == 2)
 649                                 enabled_chan3 = TRUE;
 650                         else if (probe->index == 3)
 651                                 enabled_chan4 = TRUE;
 652                         break;
 653                 case SR_PROBE_LOGIC:
 654                         if (probe->index < 8)
 655                                 enabled_pod1 = TRUE;
 656                         else
 657                                 enabled_pod2 = TRUE;
 658                         break;
 659                 default:
 660                         return SR_ERR;
 661                 }
 662         }
 663
 664         if ((enabled_pod1 && enabled_chan3) ||
 665             (enabled_pod2 && enabled_chan4))
 666                 return SR_ERR;
 667
 668         return SR_OK;
 669 }
 670
 671 static int hmo_setup_probes(const struct sr_dev_inst *sdi)
 672 {
 673         GSList *l;
 674         unsigned int i;
 675         gboolean *pod_enabled;
 676         char command[MAX_COMMAND_SIZE];
 677         struct scope_state *state;
 678         struct scope_config *model;
 679         struct sr_probe *probe;
 680         struct dev_context *devc;
 681         struct sr_scpi_dev_inst *scpi;
 682
 683         devc = sdi->priv;
 684         scpi = sdi->conn;
 685         state = devc->model_state;
 686         model = devc->model_config;
 687
 688         pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
 689
 690         for (l = sdi->probes; l; l = l->next) {
 691                 probe = l->data;
 692                 switch (probe->type) {
 693                 case SR_PROBE_ANALOG:
 694                         if (probe->enabled == state->analog_channels[probe->index].state)
 695                                 break;
 696                         g_snprintf(command, sizeof(command),
 697                                    (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
 698                                    probe->index + 1, probe->enabled);
 699
 700                         if (sr_scpi_send(scpi, command) != SR_OK)
 701                                 return SR_ERR;
 702                         state->analog_channels[probe->index].state = probe->enabled;
 703                         break;
 704                 case SR_PROBE_LOGIC:
 705                         /*
 706                          * A digital POD needs to be enabled for every group of
 707                          * 8 probes.
 708                          */
 709                         if (probe->enabled)
 710                                 pod_enabled[probe->index < 8 ? 0 : 1] = TRUE;
 711
 712                         if (probe->enabled == state->digital_channels[probe->index])
 713                                 break;
 714                         g_snprintf(command, sizeof(command),
 715                                    (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
 716                                    probe->index, probe->enabled);
 717
 718                         if (sr_scpi_send(scpi, command) != SR_OK)
 719                                 return SR_ERR;
 720
 721                         state->digital_channels[probe->index] = probe->enabled;
 722                         break;
 723                 default:
 724                         return SR_ERR;
 725                 }
 726         }
 727
 728         for (i = 1; i <= model->digital_pods; ++i) {
 729                 if (state->digital_pods[i - 1] == pod_enabled[i - 1])
 730                         continue;
 731                 g_snprintf(command, sizeof(command),
 732                            (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
 733                            i, pod_enabled[i - 1]);
 734                 if (sr_scpi_send(scpi, command) != SR_OK)
 735                         return SR_ERR;
 736                 state->digital_pods[i - 1] = pod_enabled[i - 1];
 737         }
 738
 739         g_free(pod_enabled);
 740
 741         return SR_OK;
 742 }
 743
 744 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 745 {
 746         GSList *l;
 747         gboolean digital_added;
 748         struct sr_probe *probe;
 749         struct dev_context *devc;
 750         struct sr_scpi_dev_inst *scpi;
 751
 752         if (sdi->status != SR_ST_ACTIVE)
 753                 return SR_ERR_DEV_CLOSED;
 754
 755         scpi = sdi->conn;
 756         devc = sdi->priv;
 757         digital_added = FALSE;
 758
 759         for (l = sdi->probes; l; l = l->next) {
 760                 probe = l->data;
 761                 if (!probe->enabled)
 762                         continue;
 763                 /* Only add a single digital probe. */
 764                 if (probe->type != SR_PROBE_LOGIC || !digital_added) {
 765                         devc->enabled_probes = g_slist_append(
 766                                         devc->enabled_probes, probe);
 767                         if (probe->type == SR_PROBE_LOGIC)
 768                                 digital_added = TRUE;
 769                 }
 770         }
 771
 772         if (!devc->enabled_probes)
 773                 return SR_ERR;
 774
 775         if (hmo_check_probes(devc->enabled_probes) != SR_OK) {
 776                 sr_err("Invalid probe configuration specified!");
 777                 return SR_ERR_NA;
 778         }
 779
 780         if (hmo_setup_probes(sdi) != SR_OK) {
 781                 sr_err("Failed to setup probe configuration!");
 782                 return SR_ERR;
 783         }
 784
 785         sr_scpi_source_add(scpi, G_IO_IN, 50, hmo_receive_data, (void *)sdi);
 786
 787         /* Send header packet to the session bus. */
 788         std_session_send_df_header(cb_data, LOG_PREFIX);
 789
 790         devc->current_probe = devc->enabled_probes;
 791
 792         return hmo_request_data(sdi);
 793 }
 794
 795 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 796 {
 797         struct dev_context *devc;
 798         struct sr_scpi_dev_inst *scpi;
 799
 800         (void)cb_data;
 801
 802         if (sdi->status != SR_ST_ACTIVE)
 803                 return SR_ERR_DEV_CLOSED;
 804
 805         devc = sdi->priv;
 806
 807         g_slist_free(devc->enabled_probes);
 808         devc->enabled_probes = NULL;
 809         scpi = sdi->conn;
 810         sr_scpi_source_remove(scpi);
 811
 812         return SR_OK;
 813 }
 814
 815 SR_PRIV struct sr_dev_driver hameg_hmo_driver_info = {
 816         .name = "hameg-hmo",
 817         .longname = "Hameg HMO",
 818         .api_version = 1,
 819         .init = init,
 820         .cleanup = cleanup,
 821         .scan = scan,
 822         .dev_list = dev_list,
 823         .dev_clear = dev_clear,
 824         .config_get = config_get,
 825         .config_set = config_set,
 826         .config_list = config_list,
 827         .dev_open = dev_open,
 828         .dev_close = dev_close,
 829         .dev_acquisition_start = dev_acquisition_start,
 830         .dev_acquisition_stop = dev_acquisition_stop,
 831         .priv = NULL,
 832 };