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
  34 #define USB_INTERFACE           0
  35 #define USB_CONFIGURATION       1
  36 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  37
  38 #define MAX_RENUM_DELAY_MS      3000
  39 #define NUM_SIMUL_TRANSFERS     32
  40
  41 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  42 static struct sr_dev_driver *di = &saleae_logic16_driver_info;
  43
  44 static const int32_t hwopts[] = {
  45         SR_CONF_CONN,
  46 };
  47
  48 static const int32_t hwcaps[] = {
  49         SR_CONF_LOGIC_ANALYZER,
  50         SR_CONF_SAMPLERATE,
  51         SR_CONF_VOLTAGE_THRESHOLD,
  52
  53         /* These are really implemented in the driver, not the hardware. */
  54         SR_CONF_LIMIT_SAMPLES,
  55         SR_CONF_CONTINUOUS,
  56 };
  57
  58 static const char *probe_names[] = {
  59         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  60         "9", "10", "11", "12", "13", "14", "15",
  61         NULL,
  62 };
  63
  64 static const struct {
  65         enum voltage_range range;
  66         gdouble low;
  67         gdouble high;
  68 } volt_thresholds[] = {
  69         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  70         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  71 };
  72
  73 static const uint64_t samplerates[] = {
  74         SR_KHZ(500),
  75         SR_MHZ(1),
  76         SR_MHZ(2),
  77         SR_MHZ(4),
  78         SR_MHZ(5),
  79         SR_MHZ(8),
  80         SR_MHZ(10),
  81         SR_KHZ(12500),
  82         SR_MHZ(16),
  83         SR_MHZ(25),
  84         SR_MHZ(32),
  85         SR_MHZ(40),
  86         SR_MHZ(80),
  87         SR_MHZ(100),
  88 };
  89
  90 static int init(struct sr_context *sr_ctx)
  91 {
  92         return std_init(sr_ctx, di, LOG_PREFIX);
  93 }
  94
  95 static gboolean check_conf_profile(libusb_device *dev)
  96 {
  97         struct libusb_device_descriptor des;
  98         struct libusb_device_handle *hdl;
  99         gboolean ret;
 100         unsigned char strdesc[64];
 101
 102         hdl = NULL;
 103         ret = FALSE;
 104         while (!ret) {
 105                 /* Assume the FW has not been loaded, unless proven wrong. */
 106                 if (libusb_get_device_descriptor(dev, &des) != 0)
 107                         break;
 108
 109                 if (libusb_open(dev, &hdl) != 0)
 110                         break;
 111
 112                 if (libusb_get_string_descriptor_ascii(hdl,
 113                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 114                         break;
 115                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 116                         break;
 117
 118                 if (libusb_get_string_descriptor_ascii(hdl,
 119                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 120                         break;
 121                 if (strcmp((const char *)strdesc, "Logic S/16"))
 122                         break;
 123
 124                 /* If we made it here, it must be a configured Logic16. */
 125                 ret = TRUE;
 126         }
 127         if (hdl)
 128                 libusb_close(hdl);
 129
 130         return ret;
 131 }
 132
 133 static GSList *scan(GSList *options)
 134 {
 135         struct drv_context *drvc;
 136         struct dev_context *devc;
 137         struct sr_dev_inst *sdi;
 138         struct sr_usb_dev_inst *usb;
 139         struct sr_channel *probe;
 140         struct sr_config *src;
 141         GSList *l, *devices, *conn_devices;
 142         struct libusb_device_descriptor des;
 143         libusb_device **devlist;
 144         int devcnt, ret, i, j;
 145         const char *conn;
 146
 147         drvc = di->priv;
 148
 149         conn = NULL;
 150         for (l = options; l; l = l->next) {
 151                 src = l->data;
 152                 switch (src->key) {
 153                 case SR_CONF_CONN:
 154                         conn = g_variant_get_string(src->data, NULL);
 155                         break;
 156                 }
 157         }
 158         if (conn)
 159                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 160         else
 161                 conn_devices = NULL;
 162
 163         /* Find all Logic16 devices and upload firmware to them. */
 164         devices = NULL;
 165         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 166         for (i = 0; devlist[i]; i++) {
 167                 if (conn) {
 168                         usb = NULL;
 169                         for (l = conn_devices; l; l = l->next) {
 170                                 usb = l->data;
 171                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 172                                     && usb->address == libusb_get_device_address(devlist[i]))
 173                                         break;
 174                         }
 175                         if (!l)
 176                                 /* This device matched none of the ones that
 177                                  * matched the conn specification. */
 178                                 continue;
 179                 }
 180
 181                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 182                         sr_warn("Failed to get device descriptor: %s.",
 183                                 libusb_error_name(ret));
 184                         continue;
 185                 }
 186
 187                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 188                         continue;
 189
 190                 devcnt = g_slist_length(drvc->instances);
 191                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 192                                       "Saleae", "Logic16", NULL);
 193                 if (!sdi)
 194                         return NULL;
 195                 sdi->driver = di;
 196
 197                 for (j = 0; probe_names[j]; j++) {
 198                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 199                                                    probe_names[j])))
 200                                 return NULL;
 201                         sdi->probes = g_slist_append(sdi->probes, probe);
 202                 }
 203
 204                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 205                         return NULL;
 206                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 207                 sdi->priv = devc;
 208                 drvc->instances = g_slist_append(drvc->instances, sdi);
 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(devlist[i], USB_CONFIGURATION,
 221                                                   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 for "
 226                                        "device %d.", devcnt);
 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 devices;
 236 }
 237
 238 static GSList *dev_list(void)
 239 {
 240         return ((struct drv_context *)(di->priv))->instances;
 241 }
 242
 243 static int logic16_dev_open(struct sr_dev_inst *sdi)
 244 {
 245         libusb_device **devlist;
 246         struct sr_usb_dev_inst *usb;
 247         struct libusb_device_descriptor des;
 248         struct drv_context *drvc;
 249         int ret, skip, i, device_count;
 250
 251         drvc = di->priv;
 252         usb = sdi->conn;
 253
 254         if (sdi->status == SR_ST_ACTIVE)
 255                 /* Device is already in use. */
 256                 return SR_ERR;
 257
 258         skip = 0;
 259         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 260         if (device_count < 0) {
 261                 sr_err("Failed to get device list: %s.",
 262                        libusb_error_name(device_count));
 263                 return SR_ERR;
 264         }
 265
 266         for (i = 0; i < device_count; i++) {
 267                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 268                         sr_err("Failed to get device descriptor: %s.",
 269                                libusb_error_name(ret));
 270                         continue;
 271                 }
 272
 273                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 274                         continue;
 275
 276                 if (sdi->status == SR_ST_INITIALIZING) {
 277                         if (skip != sdi->index) {
 278                                 /* Skip devices of this type that aren't the one we want. */
 279                                 skip += 1;
 280                                 continue;
 281                         }
 282                 } else if (sdi->status == SR_ST_INACTIVE) {
 283                         /*
 284                          * This device is fully enumerated, so we need to find
 285                          * this device by vendor, product, bus and address.
 286                          */
 287                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 288                             || libusb_get_device_address(devlist[i]) != usb->address)
 289                                 /* This is not the one. */
 290                                 continue;
 291                 }
 292
 293                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 294                         if (usb->address == 0xff)
 295                                 /*
 296                                  * First time we touch this device after FW
 297                                  * upload, so we don't know the address yet.
 298                                  */
 299                                 usb->address = libusb_get_device_address(devlist[i]);
 300                 } else {
 301                         sr_err("Failed to open device: %s.",
 302                                libusb_error_name(ret));
 303                         break;
 304                 }
 305
 306                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 307                 if (ret == LIBUSB_ERROR_BUSY) {
 308                         sr_err("Unable to claim USB interface. Another "
 309                                "program or driver has already claimed it.");
 310                         break;
 311                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 312                         sr_err("Device has been disconnected.");
 313                         break;
 314                 } else if (ret != 0) {
 315                         sr_err("Unable to claim interface: %s.",
 316                                libusb_error_name(ret));
 317                         break;
 318                 }
 319
 320                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 321                         sr_err("Failed to init device.");
 322                         break;
 323                 }
 324
 325                 sdi->status = SR_ST_ACTIVE;
 326                 sr_info("Opened device %d on %d.%d, interface %d.",
 327                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 328
 329                 break;
 330         }
 331         libusb_free_device_list(devlist, 1);
 332
 333         if (sdi->status != SR_ST_ACTIVE) {
 334                 if (usb->devhdl) {
 335                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 336                         libusb_close(usb->devhdl);
 337                         usb->devhdl = NULL;
 338                 }
 339                 return SR_ERR;
 340         }
 341
 342         return SR_OK;
 343 }
 344
 345 static int dev_open(struct sr_dev_inst *sdi)
 346 {
 347         struct dev_context *devc;
 348         int ret;
 349         int64_t timediff_us, timediff_ms;
 350
 351         devc = sdi->priv;
 352
 353         /*
 354          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 355          * milliseconds for the FX2 to renumerate.
 356          */
 357         ret = SR_ERR;
 358         if (devc->fw_updated > 0) {
 359                 sr_info("Waiting for device to reset.");
 360                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 361                 g_usleep(300 * 1000);
 362                 timediff_ms = 0;
 363                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 364                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 365                                 break;
 366                         g_usleep(100 * 1000);
 367
 368                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 369                         timediff_ms = timediff_us / 1000;
 370                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 371                 }
 372                 if (ret != SR_OK) {
 373                         sr_err("Device failed to renumerate.");
 374                         return SR_ERR;
 375                 }
 376                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 377         } else {
 378                 sr_info("Firmware upload was not needed.");
 379                 ret = logic16_dev_open(sdi);
 380         }
 381
 382         if (ret != SR_OK) {
 383                 sr_err("Unable to open device.");
 384                 return SR_ERR;
 385         }
 386
 387         if (devc->cur_samplerate == 0) {
 388                 /* Samplerate hasn't been set; default to the slowest one. */
 389                 devc->cur_samplerate = samplerates[0];
 390         }
 391
 392         return SR_OK;
 393 }
 394
 395 static int dev_close(struct sr_dev_inst *sdi)
 396 {
 397         struct sr_usb_dev_inst *usb;
 398
 399         usb = sdi->conn;
 400         if (usb->devhdl == NULL)
 401                 return SR_ERR;
 402
 403         sr_info("Closing device %d on %d.%d interface %d.",
 404                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 405         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 406         libusb_close(usb->devhdl);
 407         usb->devhdl = NULL;
 408         sdi->status = SR_ST_INACTIVE;
 409
 410         return SR_OK;
 411 }
 412
 413 static int cleanup(void)
 414 {
 415         int ret;
 416         struct drv_context *drvc;
 417
 418         if (!(drvc = di->priv))
 419                 /* Can get called on an unused driver, doesn't matter. */
 420                 return SR_OK;
 421
 422
 423         ret = std_dev_clear(di, NULL);
 424         g_free(drvc);
 425         di->priv = NULL;
 426
 427         return ret;
 428 }
 429
 430 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 431                 const struct sr_channel_group *cg)
 432 {
 433         struct dev_context *devc;
 434         struct sr_usb_dev_inst *usb;
 435         GVariant *range[2];
 436         char str[128];
 437         int ret;
 438         unsigned int i;
 439
 440         (void)cg;
 441
 442         ret = SR_OK;
 443         switch (key) {
 444         case SR_CONF_CONN:
 445                 if (!sdi || !sdi->conn)
 446                         return SR_ERR_ARG;
 447                 usb = sdi->conn;
 448                 if (usb->address == 255)
 449                         /* Device still needs to re-enumerate after firmware
 450                          * upload, so we don't know its (future) address. */
 451                         return SR_ERR;
 452                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 453                 *data = g_variant_new_string(str);
 454                 break;
 455         case SR_CONF_SAMPLERATE:
 456                 if (!sdi)
 457                         return SR_ERR;
 458                 devc = sdi->priv;
 459                 *data = g_variant_new_uint64(devc->cur_samplerate);
 460                 break;
 461         case SR_CONF_VOLTAGE_THRESHOLD:
 462                 if (!sdi)
 463                         return SR_ERR;
 464                 devc = sdi->priv;
 465                 ret = SR_ERR;
 466                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 467                         if (devc->selected_voltage_range !=
 468                             volt_thresholds[i].range)
 469                                 continue;
 470                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 471                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 472                         *data = g_variant_new_tuple(range, 2);
 473                         ret = SR_OK;
 474                         break;
 475                 }
 476                 break;
 477         default:
 478                 return SR_ERR_NA;
 479         }
 480
 481         return ret;
 482 }
 483
 484 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 485                 const struct sr_channel_group *cg)
 486 {
 487         struct dev_context *devc;
 488         gdouble low, high;
 489         int ret;
 490         unsigned int i;
 491
 492         (void)cg;
 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                 const struct sr_channel_group *cg)
 529 {
 530         GVariant *gvar, *range[2];
 531         GVariantBuilder gvb;
 532         int ret;
 533         unsigned int i;
 534
 535         (void)sdi;
 536         (void)cg;
 537
 538         ret = SR_OK;
 539         switch (key) {
 540         case SR_CONF_SCAN_OPTIONS:
 541                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 542                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 543                 break;
 544         case SR_CONF_DEVICE_OPTIONS:
 545                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 546                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 547                 break;
 548         case SR_CONF_SAMPLERATE:
 549                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 550                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 551                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 552                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 553                 *data = g_variant_builder_end(&gvb);
 554                 break;
 555         case SR_CONF_VOLTAGE_THRESHOLD:
 556                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 557                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 558                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 559                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 560                         gvar = g_variant_new_tuple(range, 2);
 561                         g_variant_builder_add_value(&gvb, gvar);
 562                 }
 563                 *data = g_variant_builder_end(&gvb);
 564                 break;
 565         default:
 566                 return SR_ERR_NA;
 567         }
 568
 569         return ret;
 570 }
 571
 572 static void abort_acquisition(struct dev_context *devc)
 573 {
 574         int i;
 575
 576         devc->num_samples = -1;
 577
 578         for (i = devc->num_transfers - 1; i >= 0; i--) {
 579                 if (devc->transfers[i])
 580                         libusb_cancel_transfer(devc->transfers[i]);
 581         }
 582 }
 583
 584 static unsigned int bytes_per_ms(struct dev_context *devc)
 585 {
 586         return devc->cur_samplerate * devc->num_channels / 8000;
 587 }
 588
 589 static size_t get_buffer_size(struct dev_context *devc)
 590 {
 591         size_t s;
 592
 593         /*
 594          * The buffer should be large enough to hold 10ms of data and
 595          * a multiple of 512.
 596          */
 597         s = 10 * bytes_per_ms(devc);
 598         return (s + 511) & ~511;
 599 }
 600
 601 static unsigned int get_number_of_transfers(struct dev_context *devc)
 602 {
 603         unsigned int n;
 604
 605         /* Total buffer size should be able to hold about 500ms of data. */
 606         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 607
 608         if (n > NUM_SIMUL_TRANSFERS)
 609                 return NUM_SIMUL_TRANSFERS;
 610
 611         return n;
 612 }
 613
 614 static unsigned int get_timeout(struct dev_context *devc)
 615 {
 616         size_t total_size;
 617         unsigned int timeout;
 618
 619         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 620         timeout = total_size / bytes_per_ms(devc);
 621         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 622 }
 623
 624 static int configure_probes(const struct sr_dev_inst *sdi)
 625 {
 626         struct dev_context *devc;
 627         struct sr_channel *probe;
 628         GSList *l;
 629         uint16_t probe_bit;
 630
 631         devc = sdi->priv;
 632
 633         devc->cur_channels = 0;
 634         devc->num_channels = 0;
 635         for (l = sdi->probes; l; l = l->next) {
 636                 probe = (struct sr_channel *)l->data;
 637                 if (probe->enabled == FALSE)
 638                         continue;
 639
 640                 probe_bit = 1 << (probe->index);
 641
 642                 devc->cur_channels |= probe_bit;
 643
 644 #ifdef WORDS_BIGENDIAN
 645                 /*
 646                  * Output logic data should be stored in little endian format.
 647                  * To speed things up during conversion, do the switcharoo
 648                  * here instead.
 649                  */
 650                 probe_bit = 1 << (probe->index ^ 8);
 651 #endif
 652
 653                 devc->channel_masks[devc->num_channels++] = probe_bit;
 654         }
 655
 656         return SR_OK;
 657 }
 658
 659 static int receive_data(int fd, int revents, void *cb_data)
 660 {
 661         struct timeval tv;
 662         struct dev_context *devc;
 663         struct drv_context *drvc;
 664         const struct sr_dev_inst *sdi;
 665
 666         (void)fd;
 667         (void)revents;
 668
 669         sdi = cb_data;
 670         drvc = di->priv;
 671         devc = sdi->priv;
 672
 673         tv.tv_sec = tv.tv_usec = 0;
 674         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 675
 676         if (devc->num_samples == -2) {
 677                 logic16_abort_acquisition(sdi);
 678                 abort_acquisition(devc);
 679         }
 680
 681         return TRUE;
 682 }
 683
 684 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 685 {
 686         struct dev_context *devc;
 687         struct drv_context *drvc;
 688         struct sr_usb_dev_inst *usb;
 689         struct libusb_transfer *transfer;
 690         unsigned int i, timeout, num_transfers;
 691         int ret;
 692         unsigned char *buf;
 693         size_t size, convsize;
 694
 695         if (sdi->status != SR_ST_ACTIVE)
 696                 return SR_ERR_DEV_CLOSED;
 697
 698         drvc = di->priv;
 699         devc = sdi->priv;
 700         usb = sdi->conn;
 701
 702         /* Configures devc->cur_channels. */
 703         if (configure_probes(sdi) != SR_OK) {
 704                 sr_err("Failed to configure probes.");
 705                 return SR_ERR;
 706         }
 707
 708         devc->cb_data = cb_data;
 709         devc->num_samples = 0;
 710         devc->empty_transfer_count = 0;
 711         devc->cur_channel = 0;
 712         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 713
 714         timeout = get_timeout(devc);
 715         num_transfers = get_number_of_transfers(devc);
 716         size = get_buffer_size(devc);
 717         convsize = (size / devc->num_channels + 2) * 16;
 718         devc->submitted_transfers = 0;
 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         devc->ctx = drvc->sr_ctx;
 769
 770         usb_source_add(devc->ctx, timeout, receive_data, (void *)sdi);
 771
 772         /* Send header packet to the session bus. */
 773         std_session_send_df_header(cb_data, LOG_PREFIX);
 774
 775         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 776                 abort_acquisition(devc);
 777                 return ret;
 778         }
 779
 780         return SR_OK;
 781 }
 782
 783 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 784 {
 785         int ret;
 786
 787         (void)cb_data;
 788
 789         if (sdi->status != SR_ST_ACTIVE)
 790                 return SR_ERR_DEV_CLOSED;
 791
 792         ret = logic16_abort_acquisition(sdi);
 793
 794         abort_acquisition(sdi->priv);
 795
 796         return ret;
 797 }
 798
 799 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 800         .name = "saleae-logic16",
 801         .longname = "Saleae Logic16",
 802         .api_version = 1,
 803         .init = init,
 804         .cleanup = cleanup,
 805         .scan = scan,
 806         .dev_list = dev_list,
 807         .dev_clear = NULL,
 808         .config_get = config_get,
 809         .config_set = config_set,
 810         .config_list = config_list,
 811         .dev_open = dev_open,
 812         .dev_close = dev_close,
 813         .dev_acquisition_start = dev_acquisition_start,
 814         .dev_acquisition_stop = dev_acquisition_stop,
 815         .priv = NULL,
 816 };