src/hardware/saleae-logic16/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   5  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   6  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <math.h>
  28 #include <libsigrok/libsigrok.h>
  29 #include "libsigrok-internal.h"
  30 #include "protocol.h"
  31
  32 #define LOGIC16_VID             0x21a9
  33 #define LOGIC16_PID             0x1001
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            "saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42 static const uint32_t scanopts[] = {
  43         SR_CONF_CONN,
  44 };
  45
  46 static const uint32_t drvopts[] = {
  47         SR_CONF_LOGIC_ANALYZER,
  48 };
  49
  50 static const uint32_t devopts[] = {
  51         SR_CONF_CONTINUOUS,
  52         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  53         SR_CONF_CONN | SR_CONF_GET,
  54         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  55         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  56         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  57         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  58 };
  59
  60 static const int32_t trigger_matches[] = {
  61         SR_TRIGGER_ZERO,
  62         SR_TRIGGER_ONE,
  63         SR_TRIGGER_RISING,
  64         SR_TRIGGER_FALLING,
  65         SR_TRIGGER_EDGE,
  66 };
  67
  68 static const char *channel_names[] = {
  69         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  70         "9", "10", "11", "12", "13", "14", "15",
  71 };
  72
  73 static const struct {
  74         enum voltage_range range;
  75 } volt_thresholds_ranges[] = {
  76         { VOLTAGE_RANGE_18_33_V, },
  77         { VOLTAGE_RANGE_5_V, },
  78 };
  79
  80 static const struct voltage_threshold volt_thresholds[] = {
  81         { 0.7, 1.4 },
  82         { 1.4, 3.6 },
  83 };
  84
  85 static const uint64_t samplerates[] = {
  86         SR_KHZ(500),
  87         SR_MHZ(1),
  88         SR_MHZ(2),
  89         SR_MHZ(4),
  90         SR_MHZ(5),
  91         SR_MHZ(8),
  92         SR_MHZ(10),
  93         SR_KHZ(12500),
  94         SR_MHZ(16),
  95         SR_MHZ(20),
  96         SR_MHZ(25),
  97         SR_MHZ(32),
  98         SR_MHZ(40),
  99         SR_MHZ(50),
 100         SR_MHZ(80),
 101         SR_MHZ(100),
 102 };
 103
 104 static gboolean check_conf_profile(libusb_device *dev)
 105 {
 106         struct libusb_device_descriptor des;
 107         struct libusb_device_handle *hdl;
 108         gboolean ret;
 109         unsigned char strdesc[64];
 110
 111         hdl = NULL;
 112         ret = FALSE;
 113         while (!ret) {
 114                 /* Assume the FW has not been loaded, unless proven wrong. */
 115                 libusb_get_device_descriptor(dev, &des);
 116
 117                 if (libusb_open(dev, &hdl) != 0)
 118                         break;
 119
 120                 if (libusb_get_string_descriptor_ascii(hdl,
 121                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 122                         break;
 123                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 124                         break;
 125
 126                 if (libusb_get_string_descriptor_ascii(hdl,
 127                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 128                         break;
 129                 if (strcmp((const char *)strdesc, "Logic S/16"))
 130                         break;
 131
 132                 /* If we made it here, it must be a configured Logic16. */
 133                 ret = TRUE;
 134         }
 135         if (hdl)
 136                 libusb_close(hdl);
 137
 138         return ret;
 139 }
 140
 141 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 142 {
 143         struct drv_context *drvc;
 144         struct dev_context *devc;
 145         struct sr_dev_inst *sdi;
 146         struct sr_usb_dev_inst *usb;
 147         struct sr_config *src;
 148         GSList *l, *devices, *conn_devices;
 149         struct libusb_device_descriptor des;
 150         libusb_device **devlist;
 151         unsigned int i, j;
 152         const char *conn;
 153         char connection_id[64];
 154
 155         drvc = di->context;
 156
 157         conn = NULL;
 158         for (l = options; l; l = l->next) {
 159                 src = l->data;
 160                 switch (src->key) {
 161                 case SR_CONF_CONN:
 162                         conn = g_variant_get_string(src->data, NULL);
 163                         break;
 164                 }
 165         }
 166         if (conn)
 167                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 168         else
 169                 conn_devices = NULL;
 170
 171         /* Find all Logic16 devices and upload firmware to them. */
 172         devices = NULL;
 173         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 174         for (i = 0; devlist[i]; i++) {
 175                 if (conn) {
 176                         usb = NULL;
 177                         for (l = conn_devices; l; l = l->next) {
 178                                 usb = l->data;
 179                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 180                                     && usb->address == libusb_get_device_address(devlist[i]))
 181                                         break;
 182                         }
 183                         if (!l)
 184                                 /* This device matched none of the ones that
 185                                  * matched the conn specification. */
 186                                 continue;
 187                 }
 188
 189                 libusb_get_device_descriptor(devlist[i], &des);
 190
 191                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 192
 193                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 194                         continue;
 195
 196                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 197                 sdi->status = SR_ST_INITIALIZING;
 198                 sdi->vendor = g_strdup("Saleae");
 199                 sdi->model = g_strdup("Logic16");
 200                 sdi->connection_id = g_strdup(connection_id);
 201
 202                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 203                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 204                                         channel_names[j]);
 205
 206                 devc = g_malloc0(sizeof(struct dev_context));
 207                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 208                 sdi->priv = devc;
 209                 devices = g_slist_append(devices, sdi);
 210
 211                 if (check_conf_profile(devlist[i])) {
 212                         /* Already has the firmware, so fix the new address. */
 213                         sr_dbg("Found a Logic16 device.");
 214                         sdi->status = SR_ST_INACTIVE;
 215                         sdi->inst_type = SR_INST_USB;
 216                         sdi->conn = sr_usb_dev_inst_new(
 217                                 libusb_get_bus_number(devlist[i]),
 218                                 libusb_get_device_address(devlist[i]), NULL);
 219                 } else {
 220                         if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 221                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
 222                                 /* Store when this device's FW was updated. */
 223                                 devc->fw_updated = g_get_monotonic_time();
 224                         else
 225                                 sr_err("Firmware upload failed.");
 226                         sdi->inst_type = SR_INST_USB;
 227                         sdi->conn = sr_usb_dev_inst_new(
 228                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 229                 }
 230         }
 231         libusb_free_device_list(devlist, 1);
 232         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 233
 234         return std_scan_complete(di, devices);
 235 }
 236
 237 static int logic16_dev_open(struct sr_dev_inst *sdi)
 238 {
 239         struct sr_dev_driver *di;
 240         libusb_device **devlist;
 241         struct sr_usb_dev_inst *usb;
 242         struct libusb_device_descriptor des;
 243         struct drv_context *drvc;
 244         int ret = SR_ERR, i, device_count;
 245         char connection_id[64];
 246
 247         di = sdi->driver;
 248         drvc = di->context;
 249         usb = sdi->conn;
 250
 251         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 252         if (device_count < 0) {
 253                 sr_err("Failed to get device list: %s.",
 254                        libusb_error_name(device_count));
 255                 return SR_ERR;
 256         }
 257
 258         for (i = 0; i < device_count; i++) {
 259                 libusb_get_device_descriptor(devlist[i], &des);
 260
 261                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 262                         continue;
 263
 264                 if ((sdi->status == SR_ST_INITIALIZING) ||
 265                                 (sdi->status == SR_ST_INACTIVE)) {
 266                         /*
 267                          * Check device by its physical USB bus/port address.
 268                          */
 269                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 270                         if (strcmp(sdi->connection_id, connection_id))
 271                                 /* This is not the one. */
 272                                 continue;
 273                 }
 274
 275                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 276                         if (usb->address == 0xff)
 277                                 /*
 278                                  * First time we touch this device after FW
 279                                  * upload, so we don't know the address yet.
 280                                  */
 281                                 usb->address = libusb_get_device_address(devlist[i]);
 282                 } else {
 283                         sr_err("Failed to open device: %s.",
 284                                libusb_error_name(ret));
 285                         ret = SR_ERR;
 286                         break;
 287                 }
 288
 289                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 290                 if (ret == LIBUSB_ERROR_BUSY) {
 291                         sr_err("Unable to claim USB interface. Another "
 292                                "program or driver has already claimed it.");
 293                         ret = SR_ERR;
 294                         break;
 295                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 296                         sr_err("Device has been disconnected.");
 297                         ret = SR_ERR;
 298                         break;
 299                 } else if (ret != 0) {
 300                         sr_err("Unable to claim interface: %s.",
 301                                libusb_error_name(ret));
 302                         ret = SR_ERR;
 303                         break;
 304                 }
 305
 306                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 307                         sr_err("Failed to init device.");
 308                         break;
 309                 }
 310
 311                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 312                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 313
 314                 ret = SR_OK;
 315
 316                 break;
 317         }
 318
 319         libusb_free_device_list(devlist, 1);
 320
 321         if (ret != SR_OK) {
 322                 if (usb->devhdl) {
 323                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 324                         libusb_close(usb->devhdl);
 325                         usb->devhdl = NULL;
 326                 }
 327                 return SR_ERR;
 328         }
 329
 330         return SR_OK;
 331 }
 332
 333 static int dev_open(struct sr_dev_inst *sdi)
 334 {
 335         struct dev_context *devc;
 336         int ret;
 337         int64_t timediff_us, timediff_ms;
 338
 339         devc = sdi->priv;
 340
 341         /*
 342          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 343          * milliseconds for the FX2 to renumerate.
 344          */
 345         ret = SR_ERR;
 346         if (devc->fw_updated > 0) {
 347                 sr_info("Waiting for device to reset.");
 348                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 349                 g_usleep(300 * 1000);
 350                 timediff_ms = 0;
 351                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 352                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 353                                 break;
 354                         g_usleep(100 * 1000);
 355
 356                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 357                         timediff_ms = timediff_us / 1000;
 358                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 359                 }
 360                 if (ret != SR_OK) {
 361                         sr_err("Device failed to renumerate.");
 362                         return SR_ERR;
 363                 }
 364                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 365         } else {
 366                 sr_info("Firmware upload was not needed.");
 367                 ret = logic16_dev_open(sdi);
 368         }
 369
 370         if (ret != SR_OK) {
 371                 sr_err("Unable to open device.");
 372                 return SR_ERR;
 373         }
 374
 375         if (devc->cur_samplerate == 0) {
 376                 /* Samplerate hasn't been set; default to the slowest one. */
 377                 devc->cur_samplerate = samplerates[0];
 378         }
 379
 380         return SR_OK;
 381 }
 382
 383 static int dev_close(struct sr_dev_inst *sdi)
 384 {
 385         struct sr_usb_dev_inst *usb;
 386
 387         usb = sdi->conn;
 388
 389         if (!usb->devhdl)
 390                 return SR_ERR_BUG;
 391
 392         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 393                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 394         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 395         libusb_close(usb->devhdl);
 396         usb->devhdl = NULL;
 397
 398         return SR_OK;
 399 }
 400
 401 static int config_get(uint32_t key, GVariant **data,
 402         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 403 {
 404         struct dev_context *devc;
 405         struct sr_usb_dev_inst *usb;
 406         char str[128];
 407         int ret;
 408         unsigned int i;
 409
 410         (void)cg;
 411
 412         ret = SR_OK;
 413         switch (key) {
 414         case SR_CONF_CONN:
 415                 if (!sdi || !sdi->conn)
 416                         return SR_ERR_ARG;
 417                 usb = sdi->conn;
 418                 if (usb->address == 255)
 419                         /* Device still needs to re-enumerate after firmware
 420                          * upload, so we don't know its (future) address. */
 421                         return SR_ERR;
 422                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 423                 *data = g_variant_new_string(str);
 424                 break;
 425         case SR_CONF_SAMPLERATE:
 426                 if (!sdi)
 427                         return SR_ERR;
 428                 devc = sdi->priv;
 429                 *data = g_variant_new_uint64(devc->cur_samplerate);
 430                 break;
 431         case SR_CONF_CAPTURE_RATIO:
 432                 if (!sdi)
 433                         return SR_ERR;
 434                 devc = sdi->priv;
 435                 *data = g_variant_new_uint64(devc->capture_ratio);
 436                 break;
 437         case SR_CONF_VOLTAGE_THRESHOLD:
 438                 if (!sdi)
 439                         return SR_ERR;
 440                 devc = sdi->priv;
 441                 ret = SR_ERR;
 442                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 443                         if (devc->selected_voltage_range !=
 444                             volt_thresholds_ranges[i].range)
 445                                 continue;
 446                         *data = std_gvar_tuple_double(volt_thresholds[i].low, volt_thresholds[i].high);
 447                         ret = SR_OK;
 448                         break;
 449                 }
 450                 break;
 451         default:
 452                 return SR_ERR_NA;
 453         }
 454
 455         return ret;
 456 }
 457
 458 static int config_set(uint32_t key, GVariant *data,
 459         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 460 {
 461         struct dev_context *devc;
 462         gdouble low, high;
 463         int ret;
 464         unsigned int i;
 465
 466         (void)cg;
 467
 468         devc = sdi->priv;
 469
 470         ret = SR_OK;
 471         switch (key) {
 472         case SR_CONF_SAMPLERATE:
 473                 devc->cur_samplerate = g_variant_get_uint64(data);
 474                 break;
 475         case SR_CONF_LIMIT_SAMPLES:
 476                 devc->limit_samples = g_variant_get_uint64(data);
 477                 break;
 478         case SR_CONF_CAPTURE_RATIO:
 479                 devc->capture_ratio = g_variant_get_uint64(data);
 480                 ret = (devc->capture_ratio > 100) ? SR_ERR : SR_OK;
 481                 break;
 482         case SR_CONF_VOLTAGE_THRESHOLD:
 483                 g_variant_get(data, "(dd)", &low, &high);
 484                 ret = SR_ERR_ARG;
 485                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 486                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 487                             fabs(volt_thresholds[i].high - high) < 0.1) {
 488                                 devc->selected_voltage_range =
 489                                         volt_thresholds_ranges[i].range;
 490                                 ret = SR_OK;
 491                                 break;
 492                         }
 493                 }
 494                 break;
 495         default:
 496                 ret = SR_ERR_NA;
 497         }
 498
 499         return ret;
 500 }
 501
 502 static int config_list(uint32_t key, GVariant **data,
 503         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 504 {
 505         switch (key) {
 506         case SR_CONF_SCAN_OPTIONS:
 507         case SR_CONF_DEVICE_OPTIONS:
 508                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 509         case SR_CONF_SAMPLERATE:
 510                 *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 511                 break;
 512         case SR_CONF_VOLTAGE_THRESHOLD:
 513                 *data = std_gvar_thresholds(ARRAY_AND_SIZE(volt_thresholds));
 514                 break;
 515         case SR_CONF_TRIGGER_MATCH:
 516                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 517                 break;
 518         default:
 519                 return SR_ERR_NA;
 520         }
 521
 522         return SR_OK;
 523 }
 524
 525 static void abort_acquisition(struct dev_context *devc)
 526 {
 527         int i;
 528
 529         devc->sent_samples = -1;
 530
 531         for (i = devc->num_transfers - 1; i >= 0; i--) {
 532                 if (devc->transfers[i])
 533                         libusb_cancel_transfer(devc->transfers[i]);
 534         }
 535 }
 536
 537 static unsigned int bytes_per_ms(struct dev_context *devc)
 538 {
 539         return devc->cur_samplerate * devc->num_channels / 8000;
 540 }
 541
 542 static size_t get_buffer_size(struct dev_context *devc)
 543 {
 544         size_t s;
 545
 546         /*
 547          * The buffer should be large enough to hold 10ms of data and
 548          * a multiple of 512.
 549          */
 550         s = 10 * bytes_per_ms(devc);
 551         return (s + 511) & ~511;
 552 }
 553
 554 static unsigned int get_number_of_transfers(struct dev_context *devc)
 555 {
 556         unsigned int n;
 557
 558         /* Total buffer size should be able to hold about 500ms of data. */
 559         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 560
 561         if (n > NUM_SIMUL_TRANSFERS)
 562                 return NUM_SIMUL_TRANSFERS;
 563
 564         return n;
 565 }
 566
 567 static unsigned int get_timeout(struct dev_context *devc)
 568 {
 569         size_t total_size;
 570         unsigned int timeout;
 571
 572         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 573         timeout = total_size / bytes_per_ms(devc);
 574         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 575 }
 576
 577 static int configure_channels(const struct sr_dev_inst *sdi)
 578 {
 579         struct dev_context *devc;
 580         struct sr_channel *ch;
 581         GSList *l;
 582         uint16_t channel_bit;
 583
 584         devc = sdi->priv;
 585
 586         devc->cur_channels = 0;
 587         devc->num_channels = 0;
 588         for (l = sdi->channels; l; l = l->next) {
 589                 ch = (struct sr_channel *)l->data;
 590                 if (ch->enabled == FALSE)
 591                         continue;
 592
 593                 channel_bit = 1 << (ch->index);
 594
 595                 devc->cur_channels |= channel_bit;
 596
 597 #ifdef WORDS_BIGENDIAN
 598                 /*
 599                  * Output logic data should be stored in little endian format.
 600                  * To speed things up during conversion, do the switcharoo
 601                  * here instead.
 602                  */
 603                 channel_bit = 1 << (ch->index ^ 8);
 604 #endif
 605
 606                 devc->channel_masks[devc->num_channels++] = channel_bit;
 607         }
 608
 609         return SR_OK;
 610 }
 611
 612 static int receive_data(int fd, int revents, void *cb_data)
 613 {
 614         struct timeval tv;
 615         struct dev_context *devc;
 616         struct drv_context *drvc;
 617         const struct sr_dev_inst *sdi;
 618         struct sr_dev_driver *di;
 619
 620         (void)fd;
 621         (void)revents;
 622
 623         sdi = cb_data;
 624         di = sdi->driver;
 625         drvc = di->context;
 626         devc = sdi->priv;
 627
 628         tv.tv_sec = tv.tv_usec = 0;
 629         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 630
 631         if (devc->sent_samples == -2) {
 632                 logic16_abort_acquisition(sdi);
 633                 abort_acquisition(devc);
 634         }
 635
 636         return TRUE;
 637 }
 638
 639 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 640 {
 641         struct sr_dev_driver *di = sdi->driver;
 642         struct dev_context *devc;
 643         struct drv_context *drvc;
 644         struct sr_usb_dev_inst *usb;
 645         struct sr_trigger *trigger;
 646         struct libusb_transfer *transfer;
 647         unsigned int i, timeout, num_transfers;
 648         int ret;
 649         unsigned char *buf;
 650         size_t size, convsize;
 651
 652         drvc = di->context;
 653         devc = sdi->priv;
 654         usb = sdi->conn;
 655
 656         /* Configures devc->cur_channels. */
 657         if (configure_channels(sdi) != SR_OK) {
 658                 sr_err("Failed to configure channels.");
 659                 return SR_ERR;
 660         }
 661
 662         devc->sent_samples = 0;
 663         devc->empty_transfer_count = 0;
 664         devc->cur_channel = 0;
 665         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 666
 667         if ((trigger = sr_session_trigger_get(sdi->session))) {
 668                 int pre_trigger_samples = 0;
 669                 if (devc->limit_samples > 0)
 670                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 671                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 672                 if (!devc->stl)
 673                         return SR_ERR_MALLOC;
 674                 devc->trigger_fired = FALSE;
 675         } else
 676                 devc->trigger_fired = TRUE;
 677
 678         timeout = get_timeout(devc);
 679         num_transfers = get_number_of_transfers(devc);
 680         size = get_buffer_size(devc);
 681         convsize = (size / devc->num_channels + 2) * 16;
 682         devc->submitted_transfers = 0;
 683
 684         devc->convbuffer_size = convsize;
 685         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 686                 sr_err("Conversion buffer malloc failed.");
 687                 return SR_ERR_MALLOC;
 688         }
 689
 690         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 691         if (!devc->transfers) {
 692                 sr_err("USB transfers malloc failed.");
 693                 g_free(devc->convbuffer);
 694                 return SR_ERR_MALLOC;
 695         }
 696
 697         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 698                                              devc->cur_channels)) != SR_OK) {
 699                 g_free(devc->transfers);
 700                 g_free(devc->convbuffer);
 701                 return ret;
 702         }
 703
 704         devc->num_transfers = num_transfers;
 705         for (i = 0; i < num_transfers; i++) {
 706                 if (!(buf = g_try_malloc(size))) {
 707                         sr_err("USB transfer buffer malloc failed.");
 708                         if (devc->submitted_transfers)
 709                                 abort_acquisition(devc);
 710                         else {
 711                                 g_free(devc->transfers);
 712                                 g_free(devc->convbuffer);
 713                         }
 714                         return SR_ERR_MALLOC;
 715                 }
 716                 transfer = libusb_alloc_transfer(0);
 717                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 718                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 719                                 logic16_receive_transfer, (void *)sdi, timeout);
 720                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 721                         sr_err("Failed to submit transfer: %s.",
 722                                libusb_error_name(ret));
 723                         libusb_free_transfer(transfer);
 724                         g_free(buf);
 725                         abort_acquisition(devc);
 726                         return SR_ERR;
 727                 }
 728                 devc->transfers[i] = transfer;
 729                 devc->submitted_transfers++;
 730         }
 731
 732         devc->ctx = drvc->sr_ctx;
 733
 734         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 735
 736         std_session_send_df_header(sdi);
 737
 738         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 739                 abort_acquisition(devc);
 740                 return ret;
 741         }
 742
 743         return SR_OK;
 744 }
 745
 746 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 747 {
 748         int ret;
 749
 750         ret = logic16_abort_acquisition(sdi);
 751
 752         abort_acquisition(sdi->priv);
 753
 754         return ret;
 755 }
 756
 757 static struct sr_dev_driver saleae_logic16_driver_info = {
 758         .name = "saleae-logic16",
 759         .longname = "Saleae Logic16",
 760         .api_version = 1,
 761         .init = std_init,
 762         .cleanup = std_cleanup,
 763         .scan = scan,
 764         .dev_list = std_dev_list,
 765         .dev_clear = std_dev_clear,
 766         .config_get = config_get,
 767         .config_set = config_set,
 768         .config_list = config_list,
 769         .dev_open = dev_open,
 770         .dev_close = dev_close,
 771         .dev_acquisition_start = dev_acquisition_start,
 772         .dev_acquisition_stop = dev_acquisition_stop,
 773         .context = NULL,
 774 };
 775 SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);