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 } thresholds_ranges[] = {
  76         { VOLTAGE_RANGE_18_33_V, },
  77         { VOLTAGE_RANGE_5_V, },
  78 };
  79
  80 static const double thresholds[][2] = {
  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                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 192                         continue;
 193
 194                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 195                         continue;
 196
 197                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 198                 sdi->status = SR_ST_INITIALIZING;
 199                 sdi->vendor = g_strdup("Saleae");
 200                 sdi->model = g_strdup("Logic16");
 201                 sdi->connection_id = g_strdup(connection_id);
 202
 203                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 204                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 205                                         channel_names[j]);
 206
 207                 devc = g_malloc0(sizeof(struct dev_context));
 208                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 209                 sdi->priv = devc;
 210                 devices = g_slist_append(devices, sdi);
 211
 212                 if (check_conf_profile(devlist[i])) {
 213                         /* Already has the firmware, so fix the new address. */
 214                         sr_dbg("Found a Logic16 device.");
 215                         sdi->status = SR_ST_INACTIVE;
 216                         sdi->inst_type = SR_INST_USB;
 217                         sdi->conn = sr_usb_dev_inst_new(
 218                                 libusb_get_bus_number(devlist[i]),
 219                                 libusb_get_device_address(devlist[i]), NULL);
 220                 } else {
 221                         if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 222                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
 223                                 /* Store when this device's FW was updated. */
 224                                 devc->fw_updated = g_get_monotonic_time();
 225                         else
 226                                 sr_err("Firmware upload failed.");
 227                         sdi->inst_type = SR_INST_USB;
 228                         sdi->conn = sr_usb_dev_inst_new(
 229                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 230                 }
 231         }
 232         libusb_free_device_list(devlist, 1);
 233         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 234
 235         return std_scan_complete(di, devices);
 236 }
 237
 238 static int logic16_dev_open(struct sr_dev_inst *sdi)
 239 {
 240         struct sr_dev_driver *di;
 241         libusb_device **devlist;
 242         struct sr_usb_dev_inst *usb;
 243         struct libusb_device_descriptor des;
 244         struct drv_context *drvc;
 245         int ret = SR_ERR, i, device_count;
 246         char connection_id[64];
 247
 248         di = sdi->driver;
 249         drvc = di->context;
 250         usb = sdi->conn;
 251
 252         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 253         if (device_count < 0) {
 254                 sr_err("Failed to get device list: %s.",
 255                        libusb_error_name(device_count));
 256                 return SR_ERR;
 257         }
 258
 259         for (i = 0; i < device_count; i++) {
 260                 libusb_get_device_descriptor(devlist[i], &des);
 261
 262                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 263                         continue;
 264
 265                 if ((sdi->status == SR_ST_INITIALIZING) ||
 266                                 (sdi->status == SR_ST_INACTIVE)) {
 267                         /*
 268                          * Check device by its physical USB bus/port address.
 269                          */
 270                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 271                                 continue;
 272
 273                         if (strcmp(sdi->connection_id, connection_id))
 274                                 /* This is not the one. */
 275                                 continue;
 276                 }
 277
 278                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 279                         if (usb->address == 0xff)
 280                                 /*
 281                                  * First time we touch this device after FW
 282                                  * upload, so we don't know the address yet.
 283                                  */
 284                                 usb->address = libusb_get_device_address(devlist[i]);
 285                 } else {
 286                         sr_err("Failed to open device: %s.",
 287                                libusb_error_name(ret));
 288                         ret = SR_ERR;
 289                         break;
 290                 }
 291
 292                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 293                 if (ret == LIBUSB_ERROR_BUSY) {
 294                         sr_err("Unable to claim USB interface. Another "
 295                                "program or driver has already claimed it.");
 296                         ret = SR_ERR;
 297                         break;
 298                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 299                         sr_err("Device has been disconnected.");
 300                         ret = SR_ERR;
 301                         break;
 302                 } else if (ret != 0) {
 303                         sr_err("Unable to claim interface: %s.",
 304                                libusb_error_name(ret));
 305                         ret = SR_ERR;
 306                         break;
 307                 }
 308
 309                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 310                         sr_err("Failed to init device.");
 311                         break;
 312                 }
 313
 314                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 315                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 316
 317                 ret = SR_OK;
 318
 319                 break;
 320         }
 321
 322         libusb_free_device_list(devlist, 1);
 323
 324         if (ret != SR_OK) {
 325                 if (usb->devhdl) {
 326                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 327                         libusb_close(usb->devhdl);
 328                         usb->devhdl = NULL;
 329                 }
 330                 return SR_ERR;
 331         }
 332
 333         return SR_OK;
 334 }
 335
 336 static int dev_open(struct sr_dev_inst *sdi)
 337 {
 338         struct dev_context *devc;
 339         int ret;
 340         int64_t timediff_us, timediff_ms;
 341
 342         devc = sdi->priv;
 343
 344         /*
 345          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 346          * milliseconds for the FX2 to renumerate.
 347          */
 348         ret = SR_ERR;
 349         if (devc->fw_updated > 0) {
 350                 sr_info("Waiting for device to reset.");
 351                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 352                 g_usleep(300 * 1000);
 353                 timediff_ms = 0;
 354                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 355                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 356                                 break;
 357                         g_usleep(100 * 1000);
 358
 359                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 360                         timediff_ms = timediff_us / 1000;
 361                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 362                 }
 363                 if (ret != SR_OK) {
 364                         sr_err("Device failed to renumerate.");
 365                         return SR_ERR;
 366                 }
 367                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 368         } else {
 369                 sr_info("Firmware upload was not needed.");
 370                 ret = logic16_dev_open(sdi);
 371         }
 372
 373         if (ret != SR_OK) {
 374                 sr_err("Unable to open device.");
 375                 return SR_ERR;
 376         }
 377
 378         if (devc->cur_samplerate == 0) {
 379                 /* Samplerate hasn't been set; default to the slowest one. */
 380                 devc->cur_samplerate = samplerates[0];
 381         }
 382
 383         return SR_OK;
 384 }
 385
 386 static int dev_close(struct sr_dev_inst *sdi)
 387 {
 388         struct sr_usb_dev_inst *usb;
 389
 390         usb = sdi->conn;
 391
 392         if (!usb->devhdl)
 393                 return SR_ERR_BUG;
 394
 395         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 396                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 397         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 398         libusb_close(usb->devhdl);
 399         usb->devhdl = NULL;
 400
 401         return SR_OK;
 402 }
 403
 404 static int config_get(uint32_t key, GVariant **data,
 405         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 406 {
 407         struct dev_context *devc;
 408         struct sr_usb_dev_inst *usb;
 409         unsigned int i;
 410
 411         (void)cg;
 412
 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                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 423                 break;
 424         case SR_CONF_SAMPLERATE:
 425                 if (!sdi)
 426                         return SR_ERR;
 427                 devc = sdi->priv;
 428                 *data = g_variant_new_uint64(devc->cur_samplerate);
 429                 break;
 430         case SR_CONF_CAPTURE_RATIO:
 431                 if (!sdi)
 432                         return SR_ERR;
 433                 devc = sdi->priv;
 434                 *data = g_variant_new_uint64(devc->capture_ratio);
 435                 break;
 436         case SR_CONF_VOLTAGE_THRESHOLD:
 437                 if (!sdi)
 438                         return SR_ERR;
 439                 devc = sdi->priv;
 440                 for (i = 0; i < ARRAY_SIZE(thresholds); i++) {
 441                         if (devc->selected_voltage_range != thresholds_ranges[i].range)
 442                                 continue;
 443                         *data = std_gvar_tuple_double(thresholds[i][0], thresholds[i][1]);
 444                         return SR_OK;
 445                 }
 446                 return SR_ERR;
 447         default:
 448                 return SR_ERR_NA;
 449         }
 450
 451         return SR_OK;
 452 }
 453
 454 static int config_set(uint32_t key, GVariant *data,
 455         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 456 {
 457         struct dev_context *devc;
 458         int idx;
 459
 460         (void)cg;
 461
 462         devc = sdi->priv;
 463
 464         switch (key) {
 465         case SR_CONF_SAMPLERATE:
 466                 devc->cur_samplerate = g_variant_get_uint64(data);
 467                 break;
 468         case SR_CONF_LIMIT_SAMPLES:
 469                 devc->limit_samples = g_variant_get_uint64(data);
 470                 break;
 471         case SR_CONF_CAPTURE_RATIO:
 472                 devc->capture_ratio = g_variant_get_uint64(data);
 473                 break;
 474         case SR_CONF_VOLTAGE_THRESHOLD:
 475                 if ((idx = std_double_tuple_idx(data, ARRAY_AND_SIZE(thresholds))) < 0)
 476                         return SR_ERR_ARG;
 477                 devc->selected_voltage_range = thresholds_ranges[idx].range;
 478                 break;
 479         default:
 480                 return SR_ERR_NA;
 481         }
 482
 483         return SR_OK;
 484 }
 485
 486 static int config_list(uint32_t key, GVariant **data,
 487         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 488 {
 489         switch (key) {
 490         case SR_CONF_SCAN_OPTIONS:
 491         case SR_CONF_DEVICE_OPTIONS:
 492                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 493         case SR_CONF_SAMPLERATE:
 494                 *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 495                 break;
 496         case SR_CONF_VOLTAGE_THRESHOLD:
 497                 *data = std_gvar_thresholds(ARRAY_AND_SIZE(thresholds));
 498                 break;
 499         case SR_CONF_TRIGGER_MATCH:
 500                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 501                 break;
 502         default:
 503                 return SR_ERR_NA;
 504         }
 505
 506         return SR_OK;
 507 }
 508
 509 static void abort_acquisition(struct dev_context *devc)
 510 {
 511         int i;
 512
 513         devc->sent_samples = -1;
 514
 515         for (i = devc->num_transfers - 1; i >= 0; i--) {
 516                 if (devc->transfers[i])
 517                         libusb_cancel_transfer(devc->transfers[i]);
 518         }
 519 }
 520
 521 static unsigned int bytes_per_ms(struct dev_context *devc)
 522 {
 523         return devc->cur_samplerate * devc->num_channels / 8000;
 524 }
 525
 526 static size_t get_buffer_size(struct dev_context *devc)
 527 {
 528         size_t s;
 529
 530         /*
 531          * The buffer should be large enough to hold 10ms of data and
 532          * a multiple of 512.
 533          */
 534         s = 10 * bytes_per_ms(devc);
 535         return (s + 511) & ~511;
 536 }
 537
 538 static unsigned int get_number_of_transfers(struct dev_context *devc)
 539 {
 540         unsigned int n;
 541
 542         /* Total buffer size should be able to hold about 500ms of data. */
 543         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 544
 545         if (n > NUM_SIMUL_TRANSFERS)
 546                 return NUM_SIMUL_TRANSFERS;
 547
 548         return n;
 549 }
 550
 551 static unsigned int get_timeout(struct dev_context *devc)
 552 {
 553         size_t total_size;
 554         unsigned int timeout;
 555
 556         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 557         timeout = total_size / bytes_per_ms(devc);
 558         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 559 }
 560
 561 static int configure_channels(const struct sr_dev_inst *sdi)
 562 {
 563         struct dev_context *devc;
 564         struct sr_channel *ch;
 565         GSList *l;
 566         uint16_t channel_bit;
 567
 568         devc = sdi->priv;
 569
 570         devc->cur_channels = 0;
 571         devc->num_channels = 0;
 572         for (l = sdi->channels; l; l = l->next) {
 573                 ch = (struct sr_channel *)l->data;
 574                 if (ch->enabled == FALSE)
 575                         continue;
 576
 577                 channel_bit = 1 << (ch->index);
 578
 579                 devc->cur_channels |= channel_bit;
 580
 581 #ifdef WORDS_BIGENDIAN
 582                 /*
 583                  * Output logic data should be stored in little endian format.
 584                  * To speed things up during conversion, do the switcharoo
 585                  * here instead.
 586                  */
 587                 channel_bit = 1 << (ch->index ^ 8);
 588 #endif
 589
 590                 devc->channel_masks[devc->num_channels++] = channel_bit;
 591         }
 592
 593         return SR_OK;
 594 }
 595
 596 static int receive_data(int fd, int revents, void *cb_data)
 597 {
 598         struct timeval tv;
 599         struct dev_context *devc;
 600         struct drv_context *drvc;
 601         const struct sr_dev_inst *sdi;
 602         struct sr_dev_driver *di;
 603
 604         (void)fd;
 605         (void)revents;
 606
 607         sdi = cb_data;
 608         di = sdi->driver;
 609         drvc = di->context;
 610         devc = sdi->priv;
 611
 612         tv.tv_sec = tv.tv_usec = 0;
 613         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 614
 615         if (devc->sent_samples == -2) {
 616                 logic16_abort_acquisition(sdi);
 617                 abort_acquisition(devc);
 618         }
 619
 620         return TRUE;
 621 }
 622
 623 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 624 {
 625         struct sr_dev_driver *di = sdi->driver;
 626         struct dev_context *devc;
 627         struct drv_context *drvc;
 628         struct sr_usb_dev_inst *usb;
 629         struct sr_trigger *trigger;
 630         struct libusb_transfer *transfer;
 631         unsigned int i, timeout, num_transfers;
 632         int ret;
 633         unsigned char *buf;
 634         size_t size, convsize;
 635
 636         drvc = di->context;
 637         devc = sdi->priv;
 638         usb = sdi->conn;
 639
 640         /* Configures devc->cur_channels. */
 641         if (configure_channels(sdi) != SR_OK) {
 642                 sr_err("Failed to configure channels.");
 643                 return SR_ERR;
 644         }
 645
 646         devc->sent_samples = 0;
 647         devc->empty_transfer_count = 0;
 648         devc->cur_channel = 0;
 649         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 650
 651         if ((trigger = sr_session_trigger_get(sdi->session))) {
 652                 int pre_trigger_samples = 0;
 653                 if (devc->limit_samples > 0)
 654                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 655                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 656                 if (!devc->stl)
 657                         return SR_ERR_MALLOC;
 658                 devc->trigger_fired = FALSE;
 659         } else
 660                 devc->trigger_fired = TRUE;
 661
 662         timeout = get_timeout(devc);
 663         num_transfers = get_number_of_transfers(devc);
 664         size = get_buffer_size(devc);
 665         convsize = (size / devc->num_channels + 2) * 16;
 666         devc->submitted_transfers = 0;
 667
 668         devc->convbuffer_size = convsize;
 669         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 670                 sr_err("Conversion buffer malloc failed.");
 671                 return SR_ERR_MALLOC;
 672         }
 673
 674         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 675         if (!devc->transfers) {
 676                 sr_err("USB transfers malloc failed.");
 677                 g_free(devc->convbuffer);
 678                 return SR_ERR_MALLOC;
 679         }
 680
 681         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 682                                              devc->cur_channels)) != SR_OK) {
 683                 g_free(devc->transfers);
 684                 g_free(devc->convbuffer);
 685                 return ret;
 686         }
 687
 688         devc->num_transfers = num_transfers;
 689         for (i = 0; i < num_transfers; i++) {
 690                 if (!(buf = g_try_malloc(size))) {
 691                         sr_err("USB transfer buffer malloc failed.");
 692                         if (devc->submitted_transfers)
 693                                 abort_acquisition(devc);
 694                         else {
 695                                 g_free(devc->transfers);
 696                                 g_free(devc->convbuffer);
 697                         }
 698                         return SR_ERR_MALLOC;
 699                 }
 700                 transfer = libusb_alloc_transfer(0);
 701                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 702                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 703                                 logic16_receive_transfer, (void *)sdi, timeout);
 704                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 705                         sr_err("Failed to submit transfer: %s.",
 706                                libusb_error_name(ret));
 707                         libusb_free_transfer(transfer);
 708                         g_free(buf);
 709                         abort_acquisition(devc);
 710                         return SR_ERR;
 711                 }
 712                 devc->transfers[i] = transfer;
 713                 devc->submitted_transfers++;
 714         }
 715
 716         devc->ctx = drvc->sr_ctx;
 717
 718         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 719
 720         std_session_send_df_header(sdi);
 721
 722         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 723                 abort_acquisition(devc);
 724                 return ret;
 725         }
 726
 727         return SR_OK;
 728 }
 729
 730 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 731 {
 732         int ret;
 733
 734         ret = logic16_abort_acquisition(sdi);
 735
 736         abort_acquisition(sdi->priv);
 737
 738         return ret;
 739 }
 740
 741 static struct sr_dev_driver saleae_logic16_driver_info = {
 742         .name = "saleae-logic16",
 743         .longname = "Saleae Logic16",
 744         .api_version = 1,
 745         .init = std_init,
 746         .cleanup = std_cleanup,
 747         .scan = scan,
 748         .dev_list = std_dev_list,
 749         .dev_clear = std_dev_clear,
 750         .config_get = config_get,
 751         .config_set = config_set,
 752         .config_list = config_list,
 753         .dev_open = dev_open,
 754         .dev_close = dev_close,
 755         .dev_acquisition_start = dev_acquisition_start,
 756         .dev_acquisition_stop = dev_acquisition_stop,
 757         .context = NULL,
 758 };
 759 SR_REGISTER_DEV_DRIVER(saleae_logic16_driver_info);