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 <glib.h>
  23 #include <libusb.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <math.h>
  27 #include "libsigrok.h"
  28 #include "libsigrok-internal.h"
  29 #include "protocol.h"
  30
  31 #define LOGIC16_VID             0x21a9
  32 #define LOGIC16_PID             0x1001
  33 #define NUM_PROBES              16
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  43 static struct sr_dev_driver *di = &saleae_logic16_driver_info;
  44
  45 static const int32_t hwopts[] = {
  46         SR_CONF_CONN,
  47 };
  48
  49 static const int32_t hwcaps[] = {
  50         SR_CONF_LOGIC_ANALYZER,
  51         SR_CONF_SAMPLERATE,
  52         SR_CONF_VOLTAGE_THRESHOLD,
  53
  54         /* These are really implemented in the driver, not the hardware. */
  55         SR_CONF_LIMIT_SAMPLES,
  56         SR_CONF_CONTINUOUS,
  57 };
  58
  59 static const char *probe_names[NUM_PROBES + 1] = {
  60         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  61         "9", "10", "11", "12", "13", "14", "15",
  62         NULL,
  63 };
  64
  65 static const struct {
  66         enum voltage_range range;
  67         gdouble low;
  68         gdouble high;
  69 } volt_thresholds[] = {
  70         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  71         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  72 };
  73
  74 static const uint64_t samplerates[] = {
  75         SR_KHZ(500),
  76         SR_MHZ(1),
  77         SR_MHZ(2),
  78         SR_MHZ(4),
  79         SR_MHZ(5),
  80         SR_MHZ(8),
  81         SR_MHZ(10),
  82         SR_KHZ(12500),
  83         SR_MHZ(16),
  84         SR_MHZ(25),
  85         SR_MHZ(32),
  86         SR_MHZ(40),
  87         SR_MHZ(80),
  88         SR_MHZ(100),
  89 };
  90
  91 static int init(struct sr_context *sr_ctx)
  92 {
  93         return std_init(sr_ctx, di, LOG_PREFIX);
  94 }
  95
  96 static gboolean check_conf_profile(libusb_device *dev)
  97 {
  98         struct libusb_device_descriptor des;
  99         struct libusb_device_handle *hdl;
 100         gboolean ret;
 101         unsigned char strdesc[64];
 102
 103         hdl = NULL;
 104         ret = FALSE;
 105         while (!ret) {
 106                 /* Assume the FW has not been loaded, unless proven wrong. */
 107                 if (libusb_get_device_descriptor(dev, &des) != 0)
 108                         break;
 109
 110                 if (libusb_open(dev, &hdl) != 0)
 111                         break;
 112
 113                 if (libusb_get_string_descriptor_ascii(hdl,
 114                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 115                         break;
 116                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 117                         break;
 118
 119                 if (libusb_get_string_descriptor_ascii(hdl,
 120                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 121                         break;
 122                 if (strcmp((const char *)strdesc, "Logic S/16"))
 123                         break;
 124
 125                 /* If we made it here, it must be a configured Logic16. */
 126                 ret = TRUE;
 127         }
 128         if (hdl)
 129                 libusb_close(hdl);
 130
 131         return ret;
 132 }
 133
 134 static GSList *scan(GSList *options)
 135 {
 136         struct drv_context *drvc;
 137         struct dev_context *devc;
 138         struct sr_dev_inst *sdi;
 139         struct sr_usb_dev_inst *usb;
 140         struct sr_probe *probe;
 141         struct sr_config *src;
 142         GSList *l, *devices, *conn_devices;
 143         struct libusb_device_descriptor des;
 144         libusb_device **devlist;
 145         int devcnt, ret, i, j;
 146         const char *conn;
 147
 148         drvc = di->priv;
 149
 150         conn = NULL;
 151         for (l = options; l; l = l->next) {
 152                 src = l->data;
 153                 switch (src->key) {
 154                 case SR_CONF_CONN:
 155                         conn = g_variant_get_string(src->data, NULL);
 156                         break;
 157                 }
 158         }
 159         if (conn)
 160                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 161         else
 162                 conn_devices = NULL;
 163
 164         /* Find all Logic16 devices and upload firmware to them. */
 165         devices = NULL;
 166         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 167         for (i = 0; devlist[i]; i++) {
 168                 if (conn) {
 169                         usb = NULL;
 170                         for (l = conn_devices; l; l = l->next) {
 171                                 usb = l->data;
 172                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 173                                     && usb->address == libusb_get_device_address(devlist[i]))
 174                                         break;
 175                         }
 176                         if (!l)
 177                                 /* This device matched none of the ones that
 178                                  * matched the conn specification. */
 179                                 continue;
 180                 }
 181
 182                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 183                         sr_warn("Failed to get device descriptor: %s.",
 184                                 libusb_error_name(ret));
 185                         continue;
 186                 }
 187
 188                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 189                         continue;
 190
 191                 devcnt = g_slist_length(drvc->instances);
 192                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 193                                       "Saleae", "Logic16", NULL);
 194                 if (!sdi)
 195                         return NULL;
 196                 sdi->driver = di;
 197
 198                 for (j = 0; probe_names[j]; j++) {
 199                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 200                                                    probe_names[j])))
 201                                 return NULL;
 202                         sdi->probes = g_slist_append(sdi->probes, probe);
 203                 }
 204
 205                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 206                         return NULL;
 207                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 208                 sdi->priv = devc;
 209                 drvc->instances = g_slist_append(drvc->instances, sdi);
 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(devlist[i], USB_CONFIGURATION,
 222                                                   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 for "
 227                                        "device %d.", devcnt);
 228                         sdi->inst_type = SR_INST_USB;
 229                         sdi->conn = sr_usb_dev_inst_new(
 230                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 231                 }
 232         }
 233         libusb_free_device_list(devlist, 1);
 234         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 235
 236         return devices;
 237 }
 238
 239 static GSList *dev_list(void)
 240 {
 241         return ((struct drv_context *)(di->priv))->instances;
 242 }
 243
 244 static int dev_clear(void)
 245 {
 246         return std_dev_clear(di, NULL);
 247 }
 248
 249 static int logic16_dev_open(struct sr_dev_inst *sdi)
 250 {
 251         libusb_device **devlist;
 252         struct sr_usb_dev_inst *usb;
 253         struct libusb_device_descriptor des;
 254         struct drv_context *drvc;
 255         int ret, skip, i, device_count;
 256
 257         drvc = di->priv;
 258         usb = sdi->conn;
 259
 260         if (sdi->status == SR_ST_ACTIVE)
 261                 /* Device is already in use. */
 262                 return SR_ERR;
 263
 264         skip = 0;
 265         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 266         if (device_count < 0) {
 267                 sr_err("Failed to get device list: %s.",
 268                        libusb_error_name(device_count));
 269                 return SR_ERR;
 270         }
 271
 272         for (i = 0; i < device_count; i++) {
 273                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 274                         sr_err("Failed to get device descriptor: %s.",
 275                                libusb_error_name(ret));
 276                         continue;
 277                 }
 278
 279                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 280                         continue;
 281
 282                 if (sdi->status == SR_ST_INITIALIZING) {
 283                         if (skip != sdi->index) {
 284                                 /* Skip devices of this type that aren't the one we want. */
 285                                 skip += 1;
 286                                 continue;
 287                         }
 288                 } else if (sdi->status == SR_ST_INACTIVE) {
 289                         /*
 290                          * This device is fully enumerated, so we need to find
 291                          * this device by vendor, product, bus and address.
 292                          */
 293                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 294                             || libusb_get_device_address(devlist[i]) != usb->address)
 295                                 /* This is not the one. */
 296                                 continue;
 297                 }
 298
 299                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 300                         if (usb->address == 0xff)
 301                                 /*
 302                                  * First time we touch this device after FW
 303                                  * upload, so we don't know the address yet.
 304                                  */
 305                                 usb->address = libusb_get_device_address(devlist[i]);
 306                 } else {
 307                         sr_err("Failed to open device: %s.",
 308                                libusb_error_name(ret));
 309                         break;
 310                 }
 311
 312                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 313                         sr_err("Failed to init device.");
 314                         break;
 315                 }
 316
 317                 sdi->status = SR_ST_ACTIVE;
 318                 sr_info("Opened device %d on %d.%d, interface %d.",
 319                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 320
 321                 break;
 322         }
 323         libusb_free_device_list(devlist, 1);
 324
 325         if (sdi->status != SR_ST_ACTIVE)
 326                 return SR_ERR;
 327
 328         return SR_OK;
 329 }
 330
 331 static int dev_open(struct sr_dev_inst *sdi)
 332 {
 333         struct sr_usb_dev_inst *usb;
 334         struct dev_context *devc;
 335         int ret;
 336         int64_t timediff_us, timediff_ms;
 337
 338         devc = sdi->priv;
 339         usb = sdi->conn;
 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         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 376         if (ret != 0) {
 377                 switch (ret) {
 378                 case LIBUSB_ERROR_BUSY:
 379                         sr_err("Unable to claim USB interface. Another "
 380                                "program or driver has already claimed it.");
 381                         break;
 382                 case LIBUSB_ERROR_NO_DEVICE:
 383                         sr_err("Device has been disconnected.");
 384                         break;
 385                 default:
 386                         sr_err("Unable to claim interface: %s.",
 387                                libusb_error_name(ret));
 388                         break;
 389                 }
 390
 391                 return SR_ERR;
 392         }
 393
 394         if (devc->cur_samplerate == 0) {
 395                 /* Samplerate hasn't been set; default to the slowest one. */
 396                 devc->cur_samplerate = samplerates[0];
 397         }
 398
 399         return SR_OK;
 400 }
 401
 402 static int dev_close(struct sr_dev_inst *sdi)
 403 {
 404         struct sr_usb_dev_inst *usb;
 405
 406         usb = sdi->conn;
 407         if (usb->devhdl == NULL)
 408                 return SR_ERR;
 409
 410         sr_info("Closing device %d on %d.%d interface %d.",
 411                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 412         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 413         libusb_close(usb->devhdl);
 414         usb->devhdl = NULL;
 415         sdi->status = SR_ST_INACTIVE;
 416
 417         return SR_OK;
 418 }
 419
 420 static int cleanup(void)
 421 {
 422         int ret;
 423         struct drv_context *drvc;
 424
 425         if (!(drvc = di->priv))
 426                 /* Can get called on an unused driver, doesn't matter. */
 427                 return SR_OK;
 428
 429         ret = dev_clear();
 430         g_free(drvc);
 431         di->priv = NULL;
 432
 433         return ret;
 434 }
 435
 436 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 437 {
 438         struct dev_context *devc;
 439         struct sr_usb_dev_inst *usb;
 440         GVariant *range[2];
 441         char str[128];
 442         int ret;
 443         unsigned int i;
 444
 445         ret = SR_OK;
 446         switch (key) {
 447         case SR_CONF_CONN:
 448                 if (!sdi || !sdi->conn)
 449                         return SR_ERR_ARG;
 450                 usb = sdi->conn;
 451                 if (usb->address == 255)
 452                         /* Device still needs to re-enumerate after firmware
 453                          * upload, so we don't know its (future) address. */
 454                         return SR_ERR;
 455                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 456                 *data = g_variant_new_string(str);
 457                 break;
 458         case SR_CONF_SAMPLERATE:
 459                 if (!sdi)
 460                         return SR_ERR;
 461                 devc = sdi->priv;
 462                 *data = g_variant_new_uint64(devc->cur_samplerate);
 463                 break;
 464         case SR_CONF_VOLTAGE_THRESHOLD:
 465                 if (!sdi)
 466                         return SR_ERR;
 467                 devc = sdi->priv;
 468                 ret = SR_ERR;
 469                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 470                         if (devc->selected_voltage_range !=
 471                             volt_thresholds[i].range)
 472                                 continue;
 473                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 474                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 475                         *data = g_variant_new_tuple(range, 2);
 476                         ret = SR_OK;
 477                         break;
 478                 }
 479                 break;
 480         default:
 481                 return SR_ERR_NA;
 482         }
 483
 484         return ret;
 485 }
 486
 487 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 488 {
 489         struct dev_context *devc;
 490         gdouble low, high;
 491         int ret;
 492         unsigned int i;
 493
 494         if (sdi->status != SR_ST_ACTIVE)
 495                 return SR_ERR_DEV_CLOSED;
 496
 497         devc = sdi->priv;
 498
 499         ret = SR_OK;
 500         switch (key) {
 501         case SR_CONF_SAMPLERATE:
 502                 devc->cur_samplerate = g_variant_get_uint64(data);
 503                 break;
 504         case SR_CONF_LIMIT_SAMPLES:
 505                 devc->limit_samples = g_variant_get_uint64(data);
 506                 break;
 507         case SR_CONF_VOLTAGE_THRESHOLD:
 508                 g_variant_get(data, "(dd)", &low, &high);
 509                 ret = SR_ERR_ARG;
 510                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 511                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 512                             fabs(volt_thresholds[i].high - high) < 0.1) {
 513                                 devc->selected_voltage_range =
 514                                         volt_thresholds[i].range;
 515                                 ret = SR_OK;
 516                                 break;
 517                         }
 518                 }
 519                 break;
 520         default:
 521                 ret = SR_ERR_NA;
 522         }
 523
 524         return ret;
 525 }
 526
 527 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 528 {
 529         GVariant *gvar, *range[2];
 530         GVariantBuilder gvb;
 531         int ret;
 532         unsigned int i;
 533
 534         (void)sdi;
 535
 536         ret = SR_OK;
 537         switch (key) {
 538         case SR_CONF_SCAN_OPTIONS:
 539                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 540                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 541                 break;
 542         case SR_CONF_DEVICE_OPTIONS:
 543                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 544                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 545                 break;
 546         case SR_CONF_SAMPLERATE:
 547                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 548                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 549                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 550                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 551                 *data = g_variant_builder_end(&gvb);
 552                 break;
 553         case SR_CONF_VOLTAGE_THRESHOLD:
 554                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 555                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 556                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 557                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 558                         gvar = g_variant_new_tuple(range, 2);
 559                         g_variant_builder_add_value(&gvb, gvar);
 560                 }
 561                 *data = g_variant_builder_end(&gvb);
 562                 break;
 563         default:
 564                 return SR_ERR_NA;
 565         }
 566
 567         return ret;
 568 }
 569
 570 static void abort_acquisition(struct dev_context *devc)
 571 {
 572         int i;
 573
 574         devc->num_samples = -1;
 575
 576         for (i = devc->num_transfers - 1; i >= 0; i--) {
 577                 if (devc->transfers[i])
 578                         libusb_cancel_transfer(devc->transfers[i]);
 579         }
 580 }
 581
 582 static unsigned int bytes_per_ms(struct dev_context *devc)
 583 {
 584         return devc->cur_samplerate * devc->num_channels / 8000;
 585 }
 586
 587 static size_t get_buffer_size(struct dev_context *devc)
 588 {
 589         size_t s;
 590
 591         /*
 592          * The buffer should be large enough to hold 10ms of data and
 593          * a multiple of 512.
 594          */
 595         s = 10 * bytes_per_ms(devc);
 596         return (s + 511) & ~511;
 597 }
 598
 599 static unsigned int get_number_of_transfers(struct dev_context *devc)
 600 {
 601         unsigned int n;
 602
 603         /* Total buffer size should be able to hold about 500ms of data. */
 604         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 605
 606         if (n > NUM_SIMUL_TRANSFERS)
 607                 return NUM_SIMUL_TRANSFERS;
 608
 609         return n;
 610 }
 611
 612 static unsigned int get_timeout(struct dev_context *devc)
 613 {
 614         size_t total_size;
 615         unsigned int timeout;
 616
 617         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 618         timeout = total_size / bytes_per_ms(devc);
 619         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 620 }
 621
 622 static int configure_probes(const struct sr_dev_inst *sdi)
 623 {
 624         struct dev_context *devc;
 625         struct sr_probe *probe;
 626         GSList *l;
 627         uint16_t probe_bit;
 628
 629         devc = sdi->priv;
 630
 631         devc->cur_channels = 0;
 632         devc->num_channels = 0;
 633         for (l = sdi->probes; l; l = l->next) {
 634                 probe = (struct sr_probe *)l->data;
 635                 if (probe->enabled == FALSE)
 636                         continue;
 637
 638                 probe_bit = 1 << (probe->index);
 639
 640                 devc->cur_channels |= probe_bit;
 641
 642 #ifdef WORDS_BIGENDIAN
 643                 /*
 644                  * Output logic data should be stored in little endian format.
 645                  * To speed things up during conversion, do the switcharoo
 646                  * here instead.
 647                  */
 648                 probe_bit = 1 << (probe->index ^ 8);
 649 #endif
 650
 651                 devc->channel_masks[devc->num_channels++] = probe_bit;
 652         }
 653
 654         return SR_OK;
 655 }
 656
 657 static int receive_data(int fd, int revents, void *cb_data)
 658 {
 659         struct timeval tv;
 660         struct dev_context *devc;
 661         struct drv_context *drvc;
 662         const struct sr_dev_inst *sdi;
 663
 664         (void)fd;
 665         (void)revents;
 666
 667         sdi = cb_data;
 668         drvc = di->priv;
 669         devc = sdi->priv;
 670
 671         tv.tv_sec = tv.tv_usec = 0;
 672         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 673
 674         if (devc->num_samples == -2) {
 675                 logic16_abort_acquisition(sdi);
 676                 abort_acquisition(devc);
 677         }
 678
 679         return TRUE;
 680 }
 681
 682 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 683 {
 684         struct dev_context *devc;
 685         struct drv_context *drvc;
 686         struct sr_usb_dev_inst *usb;
 687         struct libusb_transfer *transfer;
 688         const struct libusb_pollfd **lupfd;
 689         unsigned int i, timeout, num_transfers;
 690         int ret;
 691         unsigned char *buf;
 692         size_t size, convsize;
 693
 694         if (sdi->status != SR_ST_ACTIVE)
 695                 return SR_ERR_DEV_CLOSED;
 696
 697         drvc = di->priv;
 698         devc = sdi->priv;
 699         usb = sdi->conn;
 700
 701         /* Configures devc->cur_channels. */
 702         if (configure_probes(sdi) != SR_OK) {
 703                 sr_err("Failed to configure probes.");
 704                 return SR_ERR;
 705         }
 706
 707         devc->cb_data = cb_data;
 708         devc->num_samples = 0;
 709         devc->empty_transfer_count = 0;
 710         devc->cur_channel = 0;
 711         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 712
 713         timeout = get_timeout(devc);
 714         num_transfers = get_number_of_transfers(devc);
 715         size = get_buffer_size(devc);
 716         convsize = (size / devc->num_channels + 2) * 16;
 717         devc->submitted_transfers = 0;
 718         devc->usbfd = NULL;
 719
 720         devc->convbuffer_size = convsize;
 721         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 722                 sr_err("Conversion buffer malloc failed.");
 723                 return SR_ERR_MALLOC;
 724         }
 725
 726         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 727         if (!devc->transfers) {
 728                 sr_err("USB transfers malloc failed.");
 729                 g_free(devc->convbuffer);
 730                 return SR_ERR_MALLOC;
 731         }
 732
 733         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 734                                              devc->cur_channels)) != SR_OK) {
 735                 g_free(devc->transfers);
 736                 g_free(devc->convbuffer);
 737                 return ret;
 738         }
 739
 740         devc->num_transfers = num_transfers;
 741         for (i = 0; i < num_transfers; i++) {
 742                 if (!(buf = g_try_malloc(size))) {
 743                         sr_err("USB transfer buffer malloc failed.");
 744                         if (devc->submitted_transfers)
 745                                 abort_acquisition(devc);
 746                         else {
 747                                 g_free(devc->transfers);
 748                                 g_free(devc->convbuffer);
 749                         }
 750                         return SR_ERR_MALLOC;
 751                 }
 752                 transfer = libusb_alloc_transfer(0);
 753                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 754                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 755                                 logic16_receive_transfer, devc, timeout);
 756                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 757                         sr_err("Failed to submit transfer: %s.",
 758                                libusb_error_name(ret));
 759                         libusb_free_transfer(transfer);
 760                         g_free(buf);
 761                         abort_acquisition(devc);
 762                         return SR_ERR;
 763                 }
 764                 devc->transfers[i] = transfer;
 765                 devc->submitted_transfers++;
 766         }
 767
 768         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 769         for (i = 0; lupfd[i]; i++);
 770         devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1));
 771         if (!devc->usbfd) {
 772                 abort_acquisition(devc);
 773                 free(lupfd);
 774                 return SR_ERR;
 775         }
 776         for (i = 0; lupfd[i]; i++) {
 777                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 778                               timeout, receive_data, (void *)sdi);
 779                 devc->usbfd[i] = lupfd[i]->fd;
 780         }
 781         devc->usbfd[i] = -1;
 782         free(lupfd);
 783
 784         /* Send header packet to the session bus. */
 785         std_session_send_df_header(cb_data, LOG_PREFIX);
 786
 787         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 788                 abort_acquisition(devc);
 789                 return ret;
 790         }
 791
 792         return SR_OK;
 793 }
 794
 795 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 796 {
 797         int ret;
 798
 799         (void)cb_data;
 800
 801         if (sdi->status != SR_ST_ACTIVE)
 802                 return SR_ERR_DEV_CLOSED;
 803
 804         ret = logic16_abort_acquisition(sdi);
 805
 806         abort_acquisition(sdi->priv);
 807
 808         return ret;
 809 }
 810
 811 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 812         .name = "saleae-logic16",
 813         .longname = "Saleae Logic16",
 814         .api_version = 1,
 815         .init = init,
 816         .cleanup = cleanup,
 817         .scan = scan,
 818         .dev_list = dev_list,
 819         .dev_clear = dev_clear,
 820         .config_get = config_get,
 821         .config_set = config_set,
 822         .config_list = config_list,
 823         .dev_open = dev_open,
 824         .dev_close = dev_close,
 825         .dev_acquisition_start = dev_acquisition_start,
 826         .dev_acquisition_stop = dev_acquisition_stop,
 827         .priv = NULL,
 828 };