src/hardware/saleae-logic16/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   5  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   6  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <math.h>
  28 #include <libsigrok/libsigrok.h>
  29 #include "libsigrok-internal.h"
  30 #include "protocol.h"
  31
  32 #define LOGIC16_VID             0x21a9
  33 #define LOGIC16_PID             0x1001
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            "saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  43
  44 static const uint32_t scanopts[] = {
  45         SR_CONF_CONN,
  46 };
  47
  48 static const uint32_t devopts[] = {
  49         SR_CONF_LOGIC_ANALYZER,
  50         SR_CONF_CONTINUOUS,
  51         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  52         SR_CONF_CONN | SR_CONF_GET,
  53         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  54         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  55         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  56         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  57 };
  58
  59 static const int32_t soft_trigger_matches[] = {
  60         SR_TRIGGER_ZERO,
  61         SR_TRIGGER_ONE,
  62         SR_TRIGGER_RISING,
  63         SR_TRIGGER_FALLING,
  64         SR_TRIGGER_EDGE,
  65 };
  66
  67 static const char *channel_names[] = {
  68         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  69         "9", "10", "11", "12", "13", "14", "15",
  70 };
  71
  72 static const struct {
  73         enum voltage_range range;
  74         gdouble low;
  75         gdouble high;
  76 } volt_thresholds[] = {
  77         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  78         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  79 };
  80
  81 static const uint64_t samplerates[] = {
  82         SR_KHZ(500),
  83         SR_MHZ(1),
  84         SR_MHZ(2),
  85         SR_MHZ(4),
  86         SR_MHZ(5),
  87         SR_MHZ(8),
  88         SR_MHZ(10),
  89         SR_KHZ(12500),
  90         SR_MHZ(16),
  91         SR_MHZ(25),
  92         SR_MHZ(32),
  93         SR_MHZ(40),
  94         SR_MHZ(80),
  95         SR_MHZ(100),
  96 };
  97
  98 static gboolean check_conf_profile(libusb_device *dev)
  99 {
 100         struct libusb_device_descriptor des;
 101         struct libusb_device_handle *hdl;
 102         gboolean ret;
 103         unsigned char strdesc[64];
 104
 105         hdl = NULL;
 106         ret = FALSE;
 107         while (!ret) {
 108                 /* Assume the FW has not been loaded, unless proven wrong. */
 109                 libusb_get_device_descriptor(dev, &des);
 110
 111                 if (libusb_open(dev, &hdl) != 0)
 112                         break;
 113
 114                 if (libusb_get_string_descriptor_ascii(hdl,
 115                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 116                         break;
 117                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 118                         break;
 119
 120                 if (libusb_get_string_descriptor_ascii(hdl,
 121                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 122                         break;
 123                 if (strcmp((const char *)strdesc, "Logic S/16"))
 124                         break;
 125
 126                 /* If we made it here, it must be a configured Logic16. */
 127                 ret = TRUE;
 128         }
 129         if (hdl)
 130                 libusb_close(hdl);
 131
 132         return ret;
 133 }
 134
 135 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 136 {
 137         struct drv_context *drvc;
 138         struct dev_context *devc;
 139         struct sr_dev_inst *sdi;
 140         struct sr_usb_dev_inst *usb;
 141         struct sr_config *src;
 142         GSList *l, *devices, *conn_devices;
 143         struct libusb_device_descriptor des;
 144         libusb_device **devlist;
 145         unsigned int i, j;
 146         const char *conn;
 147         char connection_id[64];
 148
 149         drvc = di->context;
 150
 151         conn = NULL;
 152         for (l = options; l; l = l->next) {
 153                 src = l->data;
 154                 switch (src->key) {
 155                 case SR_CONF_CONN:
 156                         conn = g_variant_get_string(src->data, NULL);
 157                         break;
 158                 }
 159         }
 160         if (conn)
 161                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 162         else
 163                 conn_devices = NULL;
 164
 165         /* Find all Logic16 devices and upload firmware to them. */
 166         devices = NULL;
 167         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 168         for (i = 0; devlist[i]; i++) {
 169                 if (conn) {
 170                         usb = NULL;
 171                         for (l = conn_devices; l; l = l->next) {
 172                                 usb = l->data;
 173                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 174                                     && usb->address == libusb_get_device_address(devlist[i]))
 175                                         break;
 176                         }
 177                         if (!l)
 178                                 /* This device matched none of the ones that
 179                                  * matched the conn specification. */
 180                                 continue;
 181                 }
 182
 183                 libusb_get_device_descriptor(devlist[i], &des);
 184
 185                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 186
 187                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 188                         continue;
 189
 190                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 191                 sdi->status = SR_ST_INITIALIZING;
 192                 sdi->vendor = g_strdup("Saleae");
 193                 sdi->model = g_strdup("Logic16");
 194                 sdi->driver = di;
 195                 sdi->connection_id = g_strdup(connection_id);
 196
 197                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 198                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 199                                             channel_names[j]);
 200
 201                 devc = g_malloc0(sizeof(struct dev_context));
 202                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 203                 sdi->priv = devc;
 204                 drvc->instances = g_slist_append(drvc->instances, sdi);
 205                 devices = g_slist_append(devices, sdi);
 206
 207                 if (check_conf_profile(devlist[i])) {
 208                         /* Already has the firmware, so fix the new address. */
 209                         sr_dbg("Found a Logic16 device.");
 210                         sdi->status = SR_ST_INACTIVE;
 211                         sdi->inst_type = SR_INST_USB;
 212                         sdi->conn = sr_usb_dev_inst_new(
 213                                 libusb_get_bus_number(devlist[i]),
 214                                 libusb_get_device_address(devlist[i]), NULL);
 215                 } else {
 216                         if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 217                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
 218                                 /* Store when this device's FW was updated. */
 219                                 devc->fw_updated = g_get_monotonic_time();
 220                         else
 221                                 sr_err("Firmware upload failed.");
 222                         sdi->inst_type = SR_INST_USB;
 223                         sdi->conn = sr_usb_dev_inst_new(
 224                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 225                 }
 226         }
 227         libusb_free_device_list(devlist, 1);
 228         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 229
 230         return devices;
 231 }
 232
 233 static int logic16_dev_open(struct sr_dev_inst *sdi)
 234 {
 235         struct sr_dev_driver *di;
 236         libusb_device **devlist;
 237         struct sr_usb_dev_inst *usb;
 238         struct libusb_device_descriptor des;
 239         struct drv_context *drvc;
 240         int ret, i, device_count;
 241         char connection_id[64];
 242
 243         di = sdi->driver;
 244         drvc = di->context;
 245         usb = sdi->conn;
 246
 247         if (sdi->status == SR_ST_ACTIVE)
 248                 /* Device is already in use. */
 249                 return SR_ERR;
 250
 251         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 252         if (device_count < 0) {
 253                 sr_err("Failed to get device list: %s.",
 254                        libusb_error_name(device_count));
 255                 return SR_ERR;
 256         }
 257
 258         for (i = 0; i < device_count; i++) {
 259                 libusb_get_device_descriptor(devlist[i], &des);
 260
 261                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 262                         continue;
 263
 264                 if ((sdi->status == SR_ST_INITIALIZING) ||
 265                                 (sdi->status == SR_ST_INACTIVE)) {
 266                         /*
 267                          * Check device by its physical USB bus/port address.
 268                          */
 269                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 270                         if (strcmp(sdi->connection_id, connection_id))
 271                                 /* This is not the one. */
 272                                 continue;
 273                 }
 274
 275                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 276                         if (usb->address == 0xff)
 277                                 /*
 278                                  * First time we touch this device after FW
 279                                  * upload, so we don't know the address yet.
 280                                  */
 281                                 usb->address = libusb_get_device_address(devlist[i]);
 282                 } else {
 283                         sr_err("Failed to open device: %s.",
 284                                libusb_error_name(ret));
 285                         break;
 286                 }
 287
 288                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 289                 if (ret == LIBUSB_ERROR_BUSY) {
 290                         sr_err("Unable to claim USB interface. Another "
 291                                "program or driver has already claimed it.");
 292                         break;
 293                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 294                         sr_err("Device has been disconnected.");
 295                         break;
 296                 } else if (ret != 0) {
 297                         sr_err("Unable to claim interface: %s.",
 298                                libusb_error_name(ret));
 299                         break;
 300                 }
 301
 302                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 303                         sr_err("Failed to init device.");
 304                         break;
 305                 }
 306
 307                 sdi->status = SR_ST_ACTIVE;
 308                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 309                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 310
 311                 break;
 312         }
 313         libusb_free_device_list(devlist, 1);
 314
 315         if (sdi->status != SR_ST_ACTIVE) {
 316                 if (usb->devhdl) {
 317                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 318                         libusb_close(usb->devhdl);
 319                         usb->devhdl = NULL;
 320                 }
 321                 return SR_ERR;
 322         }
 323
 324         return SR_OK;
 325 }
 326
 327 static int dev_open(struct sr_dev_inst *sdi)
 328 {
 329         struct dev_context *devc;
 330         int ret;
 331         int64_t timediff_us, timediff_ms;
 332
 333         devc = sdi->priv;
 334
 335         /*
 336          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 337          * milliseconds for the FX2 to renumerate.
 338          */
 339         ret = SR_ERR;
 340         if (devc->fw_updated > 0) {
 341                 sr_info("Waiting for device to reset.");
 342                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 343                 g_usleep(300 * 1000);
 344                 timediff_ms = 0;
 345                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 346                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 347                                 break;
 348                         g_usleep(100 * 1000);
 349
 350                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 351                         timediff_ms = timediff_us / 1000;
 352                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 353                 }
 354                 if (ret != SR_OK) {
 355                         sr_err("Device failed to renumerate.");
 356                         return SR_ERR;
 357                 }
 358                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 359         } else {
 360                 sr_info("Firmware upload was not needed.");
 361                 ret = logic16_dev_open(sdi);
 362         }
 363
 364         if (ret != SR_OK) {
 365                 sr_err("Unable to open device.");
 366                 return SR_ERR;
 367         }
 368
 369         if (devc->cur_samplerate == 0) {
 370                 /* Samplerate hasn't been set; default to the slowest one. */
 371                 devc->cur_samplerate = samplerates[0];
 372         }
 373
 374         return SR_OK;
 375 }
 376
 377 static int dev_close(struct sr_dev_inst *sdi)
 378 {
 379         struct sr_usb_dev_inst *usb;
 380
 381         usb = sdi->conn;
 382         if (!usb->devhdl)
 383                 return SR_ERR;
 384
 385         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 386                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 387         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 388         libusb_close(usb->devhdl);
 389         usb->devhdl = NULL;
 390         sdi->status = SR_ST_INACTIVE;
 391
 392         return SR_OK;
 393 }
 394
 395 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 396                 const struct sr_channel_group *cg)
 397 {
 398         struct dev_context *devc;
 399         struct sr_usb_dev_inst *usb;
 400         GVariant *range[2];
 401         char str[128];
 402         int ret;
 403         unsigned int i;
 404
 405         (void)cg;
 406
 407         ret = SR_OK;
 408         switch (key) {
 409         case SR_CONF_CONN:
 410                 if (!sdi || !sdi->conn)
 411                         return SR_ERR_ARG;
 412                 usb = sdi->conn;
 413                 if (usb->address == 255)
 414                         /* Device still needs to re-enumerate after firmware
 415                          * upload, so we don't know its (future) address. */
 416                         return SR_ERR;
 417                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 418                 *data = g_variant_new_string(str);
 419                 break;
 420         case SR_CONF_SAMPLERATE:
 421                 if (!sdi)
 422                         return SR_ERR;
 423                 devc = sdi->priv;
 424                 *data = g_variant_new_uint64(devc->cur_samplerate);
 425                 break;
 426         case SR_CONF_CAPTURE_RATIO:
 427                 if (!sdi)
 428                         return SR_ERR;
 429                 devc = sdi->priv;
 430                 *data = g_variant_new_uint64(devc->capture_ratio);
 431                 break;
 432         case SR_CONF_VOLTAGE_THRESHOLD:
 433                 if (!sdi)
 434                         return SR_ERR;
 435                 devc = sdi->priv;
 436                 ret = SR_ERR;
 437                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 438                         if (devc->selected_voltage_range !=
 439                             volt_thresholds[i].range)
 440                                 continue;
 441                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 442                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 443                         *data = g_variant_new_tuple(range, 2);
 444                         ret = SR_OK;
 445                         break;
 446                 }
 447                 break;
 448         default:
 449                 return SR_ERR_NA;
 450         }
 451
 452         return ret;
 453 }
 454
 455 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 456                 const struct sr_channel_group *cg)
 457 {
 458         struct dev_context *devc;
 459         gdouble low, high;
 460         int ret;
 461         unsigned int i;
 462
 463         (void)cg;
 464
 465         if (sdi->status != SR_ST_ACTIVE)
 466                 return SR_ERR_DEV_CLOSED;
 467
 468         devc = sdi->priv;
 469
 470         ret = SR_OK;
 471         switch (key) {
 472         case SR_CONF_SAMPLERATE:
 473                 devc->cur_samplerate = g_variant_get_uint64(data);
 474                 break;
 475         case SR_CONF_LIMIT_SAMPLES:
 476                 devc->limit_samples = g_variant_get_uint64(data);
 477                 break;
 478         case SR_CONF_CAPTURE_RATIO:
 479                 devc->capture_ratio = g_variant_get_uint64(data);
 480                 ret = (devc->capture_ratio > 100) ? SR_ERR : SR_OK;
 481                 break;
 482         case SR_CONF_VOLTAGE_THRESHOLD:
 483                 g_variant_get(data, "(dd)", &low, &high);
 484                 ret = SR_ERR_ARG;
 485                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 486                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 487                             fabs(volt_thresholds[i].high - high) < 0.1) {
 488                                 devc->selected_voltage_range =
 489                                         volt_thresholds[i].range;
 490                                 ret = SR_OK;
 491                                 break;
 492                         }
 493                 }
 494                 break;
 495         default:
 496                 ret = SR_ERR_NA;
 497         }
 498
 499         return ret;
 500 }
 501
 502 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 503                 const struct sr_channel_group *cg)
 504 {
 505         GVariant *gvar, *range[2];
 506         GVariantBuilder gvb;
 507         int ret;
 508         unsigned int i;
 509
 510         (void)sdi;
 511         (void)cg;
 512
 513         ret = SR_OK;
 514         switch (key) {
 515         case SR_CONF_SCAN_OPTIONS:
 516                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 517                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 518                 break;
 519         case SR_CONF_DEVICE_OPTIONS:
 520                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 521                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 522                 break;
 523         case SR_CONF_SAMPLERATE:
 524                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 525                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 526                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 527                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 528                 *data = g_variant_builder_end(&gvb);
 529                 break;
 530         case SR_CONF_VOLTAGE_THRESHOLD:
 531                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 532                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 533                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 534                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 535                         gvar = g_variant_new_tuple(range, 2);
 536                         g_variant_builder_add_value(&gvb, gvar);
 537                 }
 538                 *data = g_variant_builder_end(&gvb);
 539                 break;
 540         case SR_CONF_TRIGGER_MATCH:
 541                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 542                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 543                                 sizeof(int32_t));
 544                 break;
 545         default:
 546                 return SR_ERR_NA;
 547         }
 548
 549         return ret;
 550 }
 551
 552 static void abort_acquisition(struct dev_context *devc)
 553 {
 554         int i;
 555
 556         devc->sent_samples = -1;
 557
 558         for (i = devc->num_transfers - 1; i >= 0; i--) {
 559                 if (devc->transfers[i])
 560                         libusb_cancel_transfer(devc->transfers[i]);
 561         }
 562 }
 563
 564 static unsigned int bytes_per_ms(struct dev_context *devc)
 565 {
 566         return devc->cur_samplerate * devc->num_channels / 8000;
 567 }
 568
 569 static size_t get_buffer_size(struct dev_context *devc)
 570 {
 571         size_t s;
 572
 573         /*
 574          * The buffer should be large enough to hold 10ms of data and
 575          * a multiple of 512.
 576          */
 577         s = 10 * bytes_per_ms(devc);
 578         return (s + 511) & ~511;
 579 }
 580
 581 static unsigned int get_number_of_transfers(struct dev_context *devc)
 582 {
 583         unsigned int n;
 584
 585         /* Total buffer size should be able to hold about 500ms of data. */
 586         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 587
 588         if (n > NUM_SIMUL_TRANSFERS)
 589                 return NUM_SIMUL_TRANSFERS;
 590
 591         return n;
 592 }
 593
 594 static unsigned int get_timeout(struct dev_context *devc)
 595 {
 596         size_t total_size;
 597         unsigned int timeout;
 598
 599         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 600         timeout = total_size / bytes_per_ms(devc);
 601         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 602 }
 603
 604 static int configure_channels(const struct sr_dev_inst *sdi)
 605 {
 606         struct dev_context *devc;
 607         struct sr_channel *ch;
 608         GSList *l;
 609         uint16_t channel_bit;
 610
 611         devc = sdi->priv;
 612
 613         devc->cur_channels = 0;
 614         devc->num_channels = 0;
 615         for (l = sdi->channels; l; l = l->next) {
 616                 ch = (struct sr_channel *)l->data;
 617                 if (ch->enabled == FALSE)
 618                         continue;
 619
 620                 channel_bit = 1 << (ch->index);
 621
 622                 devc->cur_channels |= channel_bit;
 623
 624 #ifdef WORDS_BIGENDIAN
 625                 /*
 626                  * Output logic data should be stored in little endian format.
 627                  * To speed things up during conversion, do the switcharoo
 628                  * here instead.
 629                  */
 630                 channel_bit = 1 << (ch->index ^ 8);
 631 #endif
 632
 633                 devc->channel_masks[devc->num_channels++] = channel_bit;
 634         }
 635
 636         return SR_OK;
 637 }
 638
 639 static int receive_data(int fd, int revents, void *cb_data)
 640 {
 641         struct timeval tv;
 642         struct dev_context *devc;
 643         struct drv_context *drvc;
 644         const struct sr_dev_inst *sdi;
 645         struct sr_dev_driver *di;
 646
 647         (void)fd;
 648         (void)revents;
 649
 650         sdi = cb_data;
 651         di = sdi->driver;
 652         drvc = di->context;
 653         devc = sdi->priv;
 654
 655         tv.tv_sec = tv.tv_usec = 0;
 656         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 657
 658         if (devc->sent_samples == -2) {
 659                 logic16_abort_acquisition(sdi);
 660                 abort_acquisition(devc);
 661         }
 662
 663         return TRUE;
 664 }
 665
 666 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 667 {
 668         struct sr_dev_driver *di = sdi->driver;
 669         struct dev_context *devc;
 670         struct drv_context *drvc;
 671         struct sr_usb_dev_inst *usb;
 672         struct sr_trigger *trigger;
 673         struct libusb_transfer *transfer;
 674         unsigned int i, timeout, num_transfers;
 675         int ret;
 676         unsigned char *buf;
 677         size_t size, convsize;
 678
 679         if (sdi->status != SR_ST_ACTIVE)
 680                 return SR_ERR_DEV_CLOSED;
 681
 682         drvc = di->context;
 683         devc = sdi->priv;
 684         usb = sdi->conn;
 685
 686         /* Configures devc->cur_channels. */
 687         if (configure_channels(sdi) != SR_OK) {
 688                 sr_err("Failed to configure channels.");
 689                 return SR_ERR;
 690         }
 691
 692         devc->sent_samples = 0;
 693         devc->empty_transfer_count = 0;
 694         devc->cur_channel = 0;
 695         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 696
 697         if ((trigger = sr_session_trigger_get(sdi->session))) {
 698                 int pre_trigger_samples = 0;
 699                 if (devc->limit_samples > 0)
 700                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 701                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 702                 if (!devc->stl)
 703                         return SR_ERR_MALLOC;
 704                 devc->trigger_fired = FALSE;
 705         } else
 706                 devc->trigger_fired = TRUE;
 707
 708         timeout = get_timeout(devc);
 709         num_transfers = get_number_of_transfers(devc);
 710         size = get_buffer_size(devc);
 711         convsize = (size / devc->num_channels + 2) * 16;
 712         devc->submitted_transfers = 0;
 713
 714         devc->convbuffer_size = convsize;
 715         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 716                 sr_err("Conversion buffer malloc failed.");
 717                 return SR_ERR_MALLOC;
 718         }
 719
 720         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 721         if (!devc->transfers) {
 722                 sr_err("USB transfers malloc failed.");
 723                 g_free(devc->convbuffer);
 724                 return SR_ERR_MALLOC;
 725         }
 726
 727         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 728                                              devc->cur_channels)) != SR_OK) {
 729                 g_free(devc->transfers);
 730                 g_free(devc->convbuffer);
 731                 return ret;
 732         }
 733
 734         devc->num_transfers = num_transfers;
 735         for (i = 0; i < num_transfers; i++) {
 736                 if (!(buf = g_try_malloc(size))) {
 737                         sr_err("USB transfer buffer malloc failed.");
 738                         if (devc->submitted_transfers)
 739                                 abort_acquisition(devc);
 740                         else {
 741                                 g_free(devc->transfers);
 742                                 g_free(devc->convbuffer);
 743                         }
 744                         return SR_ERR_MALLOC;
 745                 }
 746                 transfer = libusb_alloc_transfer(0);
 747                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 748                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 749                                 logic16_receive_transfer, (void *)sdi, timeout);
 750                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 751                         sr_err("Failed to submit transfer: %s.",
 752                                libusb_error_name(ret));
 753                         libusb_free_transfer(transfer);
 754                         g_free(buf);
 755                         abort_acquisition(devc);
 756                         return SR_ERR;
 757                 }
 758                 devc->transfers[i] = transfer;
 759                 devc->submitted_transfers++;
 760         }
 761
 762         devc->ctx = drvc->sr_ctx;
 763
 764         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 765
 766         std_session_send_df_header(sdi, LOG_PREFIX);
 767
 768         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 769                 abort_acquisition(devc);
 770                 return ret;
 771         }
 772
 773         return SR_OK;
 774 }
 775
 776 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 777 {
 778         int ret;
 779
 780         if (sdi->status != SR_ST_ACTIVE)
 781                 return SR_ERR_DEV_CLOSED;
 782
 783         ret = logic16_abort_acquisition(sdi);
 784
 785         abort_acquisition(sdi->priv);
 786
 787         return ret;
 788 }
 789
 790 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 791         .name = "saleae-logic16",
 792         .longname = "Saleae Logic16",
 793         .api_version = 1,
 794         .init = std_init,
 795         .cleanup = std_cleanup,
 796         .scan = scan,
 797         .dev_list = std_dev_list,
 798         .dev_clear = NULL,
 799         .config_get = config_get,
 800         .config_set = config_set,
 801         .config_list = config_list,
 802         .dev_open = dev_open,
 803         .dev_close = dev_close,
 804         .dev_acquisition_start = dev_acquisition_start,
 805         .dev_acquisition_stop = dev_acquisition_stop,
 806         .context = NULL,
 807 };