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         struct drv_context *drvc;
 242
 243         drvc = di->priv;
 244
 245         return drvc->instances;
 246 }
 247
 248 static int dev_clear(void)
 249 {
 250         return std_dev_clear(di, NULL);
 251 }
 252
 253 static int logic16_dev_open(struct sr_dev_inst *sdi)
 254 {
 255         libusb_device **devlist;
 256         struct sr_usb_dev_inst *usb;
 257         struct libusb_device_descriptor des;
 258         struct drv_context *drvc;
 259         int ret, skip, i, device_count;
 260
 261         drvc = di->priv;
 262         usb = sdi->conn;
 263
 264         if (sdi->status == SR_ST_ACTIVE)
 265                 /* Device is already in use. */
 266                 return SR_ERR;
 267
 268         skip = 0;
 269         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 270         if (device_count < 0) {
 271                 sr_err("Failed to get device list: %s.",
 272                        libusb_error_name(device_count));
 273                 return SR_ERR;
 274         }
 275
 276         for (i = 0; i < device_count; i++) {
 277                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 278                         sr_err("Failed to get device descriptor: %s.",
 279                                libusb_error_name(ret));
 280                         continue;
 281                 }
 282
 283                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 284                         continue;
 285
 286                 if (sdi->status == SR_ST_INITIALIZING) {
 287                         if (skip != sdi->index) {
 288                                 /* Skip devices of this type that aren't the one we want. */
 289                                 skip += 1;
 290                                 continue;
 291                         }
 292                 } else if (sdi->status == SR_ST_INACTIVE) {
 293                         /*
 294                          * This device is fully enumerated, so we need to find
 295                          * this device by vendor, product, bus and address.
 296                          */
 297                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 298                             || libusb_get_device_address(devlist[i]) != usb->address)
 299                                 /* This is not the one. */
 300                                 continue;
 301                 }
 302
 303                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 304                         if (usb->address == 0xff)
 305                                 /*
 306                                  * First time we touch this device after FW
 307                                  * upload, so we don't know the address yet.
 308                                  */
 309                                 usb->address = libusb_get_device_address(devlist[i]);
 310                 } else {
 311                         sr_err("Failed to open device: %s.",
 312                                libusb_error_name(ret));
 313                         break;
 314                 }
 315
 316                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 317                         sr_err("Failed to init device.");
 318                         break;
 319                 }
 320
 321                 sdi->status = SR_ST_ACTIVE;
 322                 sr_info("Opened device %d on %d.%d, interface %d.",
 323                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 324
 325                 break;
 326         }
 327         libusb_free_device_list(devlist, 1);
 328
 329         if (sdi->status != SR_ST_ACTIVE)
 330                 return SR_ERR;
 331
 332         return SR_OK;
 333 }
 334
 335 static int dev_open(struct sr_dev_inst *sdi)
 336 {
 337         struct sr_usb_dev_inst *usb;
 338         struct dev_context *devc;
 339         int ret;
 340         int64_t timediff_us, timediff_ms;
 341
 342         devc = sdi->priv;
 343         usb = sdi->conn;
 344
 345         /*
 346          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 347          * milliseconds for the FX2 to renumerate.
 348          */
 349         ret = SR_ERR;
 350         if (devc->fw_updated > 0) {
 351                 sr_info("Waiting for device to reset.");
 352                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 353                 g_usleep(300 * 1000);
 354                 timediff_ms = 0;
 355                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 356                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 357                                 break;
 358                         g_usleep(100 * 1000);
 359
 360                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 361                         timediff_ms = timediff_us / 1000;
 362                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 363                 }
 364                 if (ret != SR_OK) {
 365                         sr_err("Device failed to renumerate.");
 366                         return SR_ERR;
 367                 }
 368                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 369         } else {
 370                 sr_info("Firmware upload was not needed.");
 371                 ret = logic16_dev_open(sdi);
 372         }
 373
 374         if (ret != SR_OK) {
 375                 sr_err("Unable to open device.");
 376                 return SR_ERR;
 377         }
 378
 379         ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 380         if (ret != 0) {
 381                 switch (ret) {
 382                 case LIBUSB_ERROR_BUSY:
 383                         sr_err("Unable to claim USB interface. Another "
 384                                "program or driver has already claimed it.");
 385                         break;
 386                 case LIBUSB_ERROR_NO_DEVICE:
 387                         sr_err("Device has been disconnected.");
 388                         break;
 389                 default:
 390                         sr_err("Unable to claim interface: %s.",
 391                                libusb_error_name(ret));
 392                         break;
 393                 }
 394
 395                 return SR_ERR;
 396         }
 397
 398         if (devc->cur_samplerate == 0) {
 399                 /* Samplerate hasn't been set; default to the slowest one. */
 400                 devc->cur_samplerate = samplerates[0];
 401         }
 402
 403         return SR_OK;
 404 }
 405
 406 static int dev_close(struct sr_dev_inst *sdi)
 407 {
 408         struct sr_usb_dev_inst *usb;
 409
 410         usb = sdi->conn;
 411         if (usb->devhdl == NULL)
 412                 return SR_ERR;
 413
 414         sr_info("Closing device %d on %d.%d interface %d.",
 415                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 416         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 417         libusb_close(usb->devhdl);
 418         usb->devhdl = NULL;
 419         sdi->status = SR_ST_INACTIVE;
 420
 421         return SR_OK;
 422 }
 423
 424 static int cleanup(void)
 425 {
 426         int ret;
 427         struct drv_context *drvc;
 428
 429         if (!(drvc = di->priv))
 430                 /* Can get called on an unused driver, doesn't matter. */
 431                 return SR_OK;
 432
 433         ret = dev_clear();
 434         g_free(drvc);
 435         di->priv = NULL;
 436
 437         return ret;
 438 }
 439
 440 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 441 {
 442         struct dev_context *devc;
 443         struct sr_usb_dev_inst *usb;
 444         GVariant *range[2];
 445         char str[128];
 446         int ret;
 447         unsigned int i;
 448
 449         ret = SR_OK;
 450         switch (key) {
 451         case SR_CONF_CONN:
 452                 if (!sdi || !sdi->conn)
 453                         return SR_ERR_ARG;
 454                 usb = sdi->conn;
 455                 if (usb->address == 255)
 456                         /* Device still needs to re-enumerate after firmware
 457                          * upload, so we don't know its (future) address. */
 458                         return SR_ERR;
 459                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 460                 *data = g_variant_new_string(str);
 461                 break;
 462         case SR_CONF_SAMPLERATE:
 463                 if (!sdi)
 464                         return SR_ERR;
 465                 devc = sdi->priv;
 466                 *data = g_variant_new_uint64(devc->cur_samplerate);
 467                 break;
 468         case SR_CONF_VOLTAGE_THRESHOLD:
 469                 if (!sdi)
 470                         return SR_ERR;
 471                 devc = sdi->priv;
 472                 ret = SR_ERR;
 473                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 474                         if (devc->selected_voltage_range !=
 475                             volt_thresholds[i].range)
 476                                 continue;
 477                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 478                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 479                         *data = g_variant_new_tuple(range, 2);
 480                         ret = SR_OK;
 481                         break;
 482                 }
 483                 break;
 484         default:
 485                 return SR_ERR_NA;
 486         }
 487
 488         return ret;
 489 }
 490
 491 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 492 {
 493         struct dev_context *devc;
 494         gdouble low, high;
 495         int ret;
 496         unsigned int i;
 497
 498         if (sdi->status != SR_ST_ACTIVE)
 499                 return SR_ERR_DEV_CLOSED;
 500
 501         devc = sdi->priv;
 502
 503         ret = SR_OK;
 504         switch (key) {
 505         case SR_CONF_SAMPLERATE:
 506                 devc->cur_samplerate = g_variant_get_uint64(data);
 507                 break;
 508         case SR_CONF_LIMIT_SAMPLES:
 509                 devc->limit_samples = g_variant_get_uint64(data);
 510                 break;
 511         case SR_CONF_VOLTAGE_THRESHOLD:
 512                 g_variant_get(data, "(dd)", &low, &high);
 513                 ret = SR_ERR_ARG;
 514                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 515                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 516                             fabs(volt_thresholds[i].high - high) < 0.1) {
 517                                 devc->selected_voltage_range =
 518                                         volt_thresholds[i].range;
 519                                 ret = SR_OK;
 520                                 break;
 521                         }
 522                 }
 523                 break;
 524         default:
 525                 ret = SR_ERR_NA;
 526         }
 527
 528         return ret;
 529 }
 530
 531 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 532 {
 533         GVariant *gvar, *range[2];
 534         GVariantBuilder gvb;
 535         int ret;
 536         unsigned int i;
 537
 538         (void)sdi;
 539
 540         ret = SR_OK;
 541         switch (key) {
 542         case SR_CONF_SCAN_OPTIONS:
 543                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 544                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 545                 break;
 546         case SR_CONF_DEVICE_OPTIONS:
 547                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 548                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 549                 break;
 550         case SR_CONF_SAMPLERATE:
 551                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 552                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 553                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 554                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 555                 *data = g_variant_builder_end(&gvb);
 556                 break;
 557         case SR_CONF_VOLTAGE_THRESHOLD:
 558                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 559                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 560                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 561                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 562                         gvar = g_variant_new_tuple(range, 2);
 563                         g_variant_builder_add_value(&gvb, gvar);
 564                 }
 565                 *data = g_variant_builder_end(&gvb);
 566                 break;
 567         default:
 568                 return SR_ERR_NA;
 569         }
 570
 571         return ret;
 572 }
 573
 574 static void abort_acquisition(struct dev_context *devc)
 575 {
 576         int i;
 577
 578         devc->num_samples = -1;
 579
 580         for (i = devc->num_transfers - 1; i >= 0; i--) {
 581                 if (devc->transfers[i])
 582                         libusb_cancel_transfer(devc->transfers[i]);
 583         }
 584 }
 585
 586 static unsigned int bytes_per_ms(struct dev_context *devc)
 587 {
 588         return devc->cur_samplerate * devc->num_channels / 8000;
 589 }
 590
 591 static size_t get_buffer_size(struct dev_context *devc)
 592 {
 593         size_t s;
 594
 595         /*
 596          * The buffer should be large enough to hold 10ms of data and
 597          * a multiple of 512.
 598          */
 599         s = 10 * bytes_per_ms(devc);
 600         return (s + 511) & ~511;
 601 }
 602
 603 static unsigned int get_number_of_transfers(struct dev_context *devc)
 604 {
 605         unsigned int n;
 606
 607         /* Total buffer size should be able to hold about 500ms of data. */
 608         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 609
 610         if (n > NUM_SIMUL_TRANSFERS)
 611                 return NUM_SIMUL_TRANSFERS;
 612
 613         return n;
 614 }
 615
 616 static unsigned int get_timeout(struct dev_context *devc)
 617 {
 618         size_t total_size;
 619         unsigned int timeout;
 620
 621         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 622         timeout = total_size / bytes_per_ms(devc);
 623         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 624 }
 625
 626 static int configure_probes(const struct sr_dev_inst *sdi)
 627 {
 628         struct dev_context *devc;
 629         struct sr_probe *probe;
 630         GSList *l;
 631         uint16_t probe_bit;
 632
 633         devc = sdi->priv;
 634
 635         devc->cur_channels = 0;
 636         devc->num_channels = 0;
 637         for (l = sdi->probes; l; l = l->next) {
 638                 probe = (struct sr_probe *)l->data;
 639                 if (probe->enabled == FALSE)
 640                         continue;
 641
 642                 probe_bit = 1 << (probe->index);
 643
 644                 devc->cur_channels |= probe_bit;
 645
 646 #ifdef WORDS_BIGENDIAN
 647                 /*
 648                  * Output logic data should be stored in little endian format.
 649                  * To speed things up during conversion, do the switcharoo
 650                  * here instead.
 651                  */
 652                 probe_bit = 1 << (probe->index ^ 8);
 653 #endif
 654
 655                 devc->channel_masks[devc->num_channels++] = probe_bit;
 656         }
 657
 658         return SR_OK;
 659 }
 660
 661 static int receive_data(int fd, int revents, void *cb_data)
 662 {
 663         struct timeval tv;
 664         struct dev_context *devc;
 665         struct drv_context *drvc;
 666         const struct sr_dev_inst *sdi;
 667
 668         (void)fd;
 669         (void)revents;
 670
 671         sdi = cb_data;
 672         drvc = di->priv;
 673         devc = sdi->priv;
 674
 675         tv.tv_sec = tv.tv_usec = 0;
 676         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 677
 678         if (devc->num_samples == -2) {
 679                 logic16_abort_acquisition(sdi);
 680                 abort_acquisition(devc);
 681         }
 682
 683         return TRUE;
 684 }
 685
 686 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 687 {
 688         struct dev_context *devc;
 689         struct drv_context *drvc;
 690         struct sr_usb_dev_inst *usb;
 691         struct libusb_transfer *transfer;
 692         const struct libusb_pollfd **lupfd;
 693         unsigned int i, timeout, num_transfers;
 694         int ret;
 695         unsigned char *buf;
 696         size_t size, convsize;
 697
 698         if (sdi->status != SR_ST_ACTIVE)
 699                 return SR_ERR_DEV_CLOSED;
 700
 701         drvc = di->priv;
 702         devc = sdi->priv;
 703         usb = sdi->conn;
 704
 705         /* Configures devc->cur_channels. */
 706         if (configure_probes(sdi) != SR_OK) {
 707                 sr_err("Failed to configure probes.");
 708                 return SR_ERR;
 709         }
 710
 711         devc->cb_data = cb_data;
 712         devc->num_samples = 0;
 713         devc->empty_transfer_count = 0;
 714         devc->cur_channel = 0;
 715         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 716
 717         timeout = get_timeout(devc);
 718         num_transfers = get_number_of_transfers(devc);
 719         size = get_buffer_size(devc);
 720         convsize = (size / devc->num_channels + 2) * 16;
 721         devc->submitted_transfers = 0;
 722         devc->usbfd = NULL;
 723
 724         devc->convbuffer_size = convsize;
 725         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 726                 sr_err("Conversion buffer malloc failed.");
 727                 return SR_ERR_MALLOC;
 728         }
 729
 730         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 731         if (!devc->transfers) {
 732                 sr_err("USB transfers malloc failed.");
 733                 g_free(devc->convbuffer);
 734                 return SR_ERR_MALLOC;
 735         }
 736
 737         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 738                                              devc->cur_channels)) != SR_OK) {
 739                 g_free(devc->transfers);
 740                 g_free(devc->convbuffer);
 741                 return ret;
 742         }
 743
 744         devc->num_transfers = num_transfers;
 745         for (i = 0; i < num_transfers; i++) {
 746                 if (!(buf = g_try_malloc(size))) {
 747                         sr_err("USB transfer buffer malloc failed.");
 748                         if (devc->submitted_transfers)
 749                                 abort_acquisition(devc);
 750                         else {
 751                                 g_free(devc->transfers);
 752                                 g_free(devc->convbuffer);
 753                         }
 754                         return SR_ERR_MALLOC;
 755                 }
 756                 transfer = libusb_alloc_transfer(0);
 757                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 758                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 759                                 logic16_receive_transfer, devc, timeout);
 760                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 761                         sr_err("Failed to submit transfer: %s.",
 762                                libusb_error_name(ret));
 763                         libusb_free_transfer(transfer);
 764                         g_free(buf);
 765                         abort_acquisition(devc);
 766                         return SR_ERR;
 767                 }
 768                 devc->transfers[i] = transfer;
 769                 devc->submitted_transfers++;
 770         }
 771
 772         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 773         for (i = 0; lupfd[i]; i++);
 774         devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1));
 775         if (!devc->usbfd) {
 776                 abort_acquisition(devc);
 777                 free(lupfd);
 778                 return SR_ERR;
 779         }
 780         for (i = 0; lupfd[i]; i++) {
 781                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 782                               timeout, receive_data, (void *)sdi);
 783                 devc->usbfd[i] = lupfd[i]->fd;
 784         }
 785         devc->usbfd[i] = -1;
 786         free(lupfd);
 787
 788         /* Send header packet to the session bus. */
 789         std_session_send_df_header(cb_data, LOG_PREFIX);
 790
 791         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 792                 abort_acquisition(devc);
 793                 return ret;
 794         }
 795
 796         return SR_OK;
 797 }
 798
 799 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 800 {
 801         int ret;
 802
 803         (void)cb_data;
 804
 805         if (sdi->status != SR_ST_ACTIVE)
 806                 return SR_ERR_DEV_CLOSED;
 807
 808         ret = logic16_abort_acquisition(sdi);
 809
 810         abort_acquisition(sdi->priv);
 811
 812         return ret;
 813 }
 814
 815 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 816         .name = "saleae-logic16",
 817         .longname = "Saleae Logic16",
 818         .api_version = 1,
 819         .init = init,
 820         .cleanup = cleanup,
 821         .scan = scan,
 822         .dev_list = dev_list,
 823         .dev_clear = dev_clear,
 824         .config_get = config_get,
 825         .config_set = config_set,
 826         .config_list = config_list,
 827         .dev_open = dev_open,
 828         .dev_close = dev_close,
 829         .dev_acquisition_start = dev_acquisition_start,
 830         .dev_acquisition_stop = dev_acquisition_stop,
 831         .priv = NULL,
 832 };