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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  99 {
 100         return std_init(sr_ctx, di, LOG_PREFIX);
 101 }
 102
 103 static gboolean check_conf_profile(libusb_device *dev)
 104 {
 105         struct libusb_device_descriptor des;
 106         struct libusb_device_handle *hdl;
 107         gboolean ret;
 108         unsigned char strdesc[64];
 109
 110         hdl = NULL;
 111         ret = FALSE;
 112         while (!ret) {
 113                 /* Assume the FW has not been loaded, unless proven wrong. */
 114                 libusb_get_device_descriptor(dev, &des);
 115
 116                 if (libusb_open(dev, &hdl) != 0)
 117                         break;
 118
 119                 if (libusb_get_string_descriptor_ascii(hdl,
 120                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 121                         break;
 122                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 123                         break;
 124
 125                 if (libusb_get_string_descriptor_ascii(hdl,
 126                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 127                         break;
 128                 if (strcmp((const char *)strdesc, "Logic S/16"))
 129                         break;
 130
 131                 /* If we made it here, it must be a configured Logic16. */
 132                 ret = TRUE;
 133         }
 134         if (hdl)
 135                 libusb_close(hdl);
 136
 137         return ret;
 138 }
 139
 140 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 141 {
 142         struct drv_context *drvc;
 143         struct dev_context *devc;
 144         struct sr_dev_inst *sdi;
 145         struct sr_usb_dev_inst *usb;
 146         struct sr_config *src;
 147         GSList *l, *devices, *conn_devices;
 148         struct libusb_device_descriptor des;
 149         libusb_device **devlist;
 150         unsigned int i, j;
 151         const char *conn;
 152         char connection_id[64];
 153
 154         drvc = di->context;
 155
 156         conn = NULL;
 157         for (l = options; l; l = l->next) {
 158                 src = l->data;
 159                 switch (src->key) {
 160                 case SR_CONF_CONN:
 161                         conn = g_variant_get_string(src->data, NULL);
 162                         break;
 163                 }
 164         }
 165         if (conn)
 166                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 167         else
 168                 conn_devices = NULL;
 169
 170         /* Find all Logic16 devices and upload firmware to them. */
 171         devices = NULL;
 172         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 173         for (i = 0; devlist[i]; i++) {
 174                 if (conn) {
 175                         usb = NULL;
 176                         for (l = conn_devices; l; l = l->next) {
 177                                 usb = l->data;
 178                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 179                                     && usb->address == libusb_get_device_address(devlist[i]))
 180                                         break;
 181                         }
 182                         if (!l)
 183                                 /* This device matched none of the ones that
 184                                  * matched the conn specification. */
 185                                 continue;
 186                 }
 187
 188                 libusb_get_device_descriptor(devlist[i], &des);
 189
 190                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 191
 192                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 193                         continue;
 194
 195                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 196                 sdi->status = SR_ST_INITIALIZING;
 197                 sdi->vendor = g_strdup("Saleae");
 198                 sdi->model = g_strdup("Logic16");
 199                 sdi->driver = di;
 200                 sdi->connection_id = g_strdup(connection_id);
 201
 202                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 203                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 204                                             channel_names[j]);
 205
 206                 devc = g_malloc0(sizeof(struct dev_context));
 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(drvc->sr_ctx, devlist[i],
 222                                         USB_CONFIGURATION, FX2_FIRMWARE) == SR_OK)
 223                                 /* Store when this device's FW was updated. */
 224                                 devc->fw_updated = g_get_monotonic_time();
 225                         else
 226                                 sr_err("Firmware upload failed.");
 227                         sdi->inst_type = SR_INST_USB;
 228                         sdi->conn = sr_usb_dev_inst_new(
 229                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 230                 }
 231         }
 232         libusb_free_device_list(devlist, 1);
 233         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 234
 235         return devices;
 236 }
 237
 238 static GSList *dev_list(const struct sr_dev_driver *di)
 239 {
 240         return ((struct drv_context *)(di->context))->instances;
 241 }
 242
 243 static int logic16_dev_open(struct sr_dev_inst *sdi)
 244 {
 245         struct sr_dev_driver *di;
 246         libusb_device **devlist;
 247         struct sr_usb_dev_inst *usb;
 248         struct libusb_device_descriptor des;
 249         struct drv_context *drvc;
 250         int ret, i, device_count;
 251         char connection_id[64];
 252
 253         di = sdi->driver;
 254         drvc = di->context;
 255         usb = sdi->conn;
 256
 257         if (sdi->status == SR_ST_ACTIVE)
 258                 /* Device is already in use. */
 259                 return SR_ERR;
 260
 261         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 262         if (device_count < 0) {
 263                 sr_err("Failed to get device list: %s.",
 264                        libusb_error_name(device_count));
 265                 return SR_ERR;
 266         }
 267
 268         for (i = 0; i < device_count; i++) {
 269                 libusb_get_device_descriptor(devlist[i], &des);
 270
 271                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 272                         continue;
 273
 274                 if ((sdi->status == SR_ST_INITIALIZING) ||
 275                                 (sdi->status == SR_ST_INACTIVE)) {
 276                         /*
 277                          * Check device by its physical USB bus/port address.
 278                          */
 279                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 280                         if (strcmp(sdi->connection_id, connection_id))
 281                                 /* This is not the one. */
 282                                 continue;
 283                 }
 284
 285                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 286                         if (usb->address == 0xff)
 287                                 /*
 288                                  * First time we touch this device after FW
 289                                  * upload, so we don't know the address yet.
 290                                  */
 291                                 usb->address = libusb_get_device_address(devlist[i]);
 292                 } else {
 293                         sr_err("Failed to open device: %s.",
 294                                libusb_error_name(ret));
 295                         break;
 296                 }
 297
 298                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 299                 if (ret == LIBUSB_ERROR_BUSY) {
 300                         sr_err("Unable to claim USB interface. Another "
 301                                "program or driver has already claimed it.");
 302                         break;
 303                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 304                         sr_err("Device has been disconnected.");
 305                         break;
 306                 } else if (ret != 0) {
 307                         sr_err("Unable to claim interface: %s.",
 308                                libusb_error_name(ret));
 309                         break;
 310                 }
 311
 312                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 313                         sr_err("Failed to init device.");
 314                         break;
 315                 }
 316
 317                 sdi->status = SR_ST_ACTIVE;
 318                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 319                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 320
 321                 break;
 322         }
 323         libusb_free_device_list(devlist, 1);
 324
 325         if (sdi->status != SR_ST_ACTIVE) {
 326                 if (usb->devhdl) {
 327                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 328                         libusb_close(usb->devhdl);
 329                         usb->devhdl = NULL;
 330                 }
 331                 return SR_ERR;
 332         }
 333
 334         return SR_OK;
 335 }
 336
 337 static int dev_open(struct sr_dev_inst *sdi)
 338 {
 339         struct dev_context *devc;
 340         int ret;
 341         int64_t timediff_us, timediff_ms;
 342
 343         devc = sdi->priv;
 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         if (devc->cur_samplerate == 0) {
 380                 /* Samplerate hasn't been set; default to the slowest one. */
 381                 devc->cur_samplerate = samplerates[0];
 382         }
 383
 384         return SR_OK;
 385 }
 386
 387 static int dev_close(struct sr_dev_inst *sdi)
 388 {
 389         struct sr_usb_dev_inst *usb;
 390
 391         usb = sdi->conn;
 392         if (!usb->devhdl)
 393                 return SR_ERR;
 394
 395         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 396                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 397         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 398         libusb_close(usb->devhdl);
 399         usb->devhdl = NULL;
 400         sdi->status = SR_ST_INACTIVE;
 401
 402         return SR_OK;
 403 }
 404
 405 static int cleanup(const struct sr_dev_driver *di)
 406 {
 407         int ret;
 408         struct drv_context *drvc;
 409
 410         if (!(drvc = di->context))
 411                 /* Can get called on an unused driver, doesn't matter. */
 412                 return SR_OK;
 413
 414         ret = std_dev_clear(di, NULL);
 415         g_free(drvc);
 416
 417         return ret;
 418 }
 419
 420 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 421                 const struct sr_channel_group *cg)
 422 {
 423         struct dev_context *devc;
 424         struct sr_usb_dev_inst *usb;
 425         GVariant *range[2];
 426         char str[128];
 427         int ret;
 428         unsigned int i;
 429
 430         (void)cg;
 431
 432         ret = SR_OK;
 433         switch (key) {
 434         case SR_CONF_CONN:
 435                 if (!sdi || !sdi->conn)
 436                         return SR_ERR_ARG;
 437                 usb = sdi->conn;
 438                 if (usb->address == 255)
 439                         /* Device still needs to re-enumerate after firmware
 440                          * upload, so we don't know its (future) address. */
 441                         return SR_ERR;
 442                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 443                 *data = g_variant_new_string(str);
 444                 break;
 445         case SR_CONF_SAMPLERATE:
 446                 if (!sdi)
 447                         return SR_ERR;
 448                 devc = sdi->priv;
 449                 *data = g_variant_new_uint64(devc->cur_samplerate);
 450                 break;
 451         case SR_CONF_CAPTURE_RATIO:
 452                 if (!sdi)
 453                         return SR_ERR;
 454                 devc = sdi->priv;
 455                 *data = g_variant_new_uint64(devc->capture_ratio);
 456                 break;
 457         case SR_CONF_VOLTAGE_THRESHOLD:
 458                 if (!sdi)
 459                         return SR_ERR;
 460                 devc = sdi->priv;
 461                 ret = SR_ERR;
 462                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 463                         if (devc->selected_voltage_range !=
 464                             volt_thresholds[i].range)
 465                                 continue;
 466                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 467                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 468                         *data = g_variant_new_tuple(range, 2);
 469                         ret = SR_OK;
 470                         break;
 471                 }
 472                 break;
 473         default:
 474                 return SR_ERR_NA;
 475         }
 476
 477         return ret;
 478 }
 479
 480 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 481                 const struct sr_channel_group *cg)
 482 {
 483         struct dev_context *devc;
 484         gdouble low, high;
 485         int ret;
 486         unsigned int i;
 487
 488         (void)cg;
 489
 490         if (sdi->status != SR_ST_ACTIVE)
 491                 return SR_ERR_DEV_CLOSED;
 492
 493         devc = sdi->priv;
 494
 495         ret = SR_OK;
 496         switch (key) {
 497         case SR_CONF_SAMPLERATE:
 498                 devc->cur_samplerate = g_variant_get_uint64(data);
 499                 break;
 500         case SR_CONF_LIMIT_SAMPLES:
 501                 devc->limit_samples = g_variant_get_uint64(data);
 502                 break;
 503         case SR_CONF_CAPTURE_RATIO:
 504                 devc->capture_ratio = g_variant_get_uint64(data);
 505                 ret = (devc->capture_ratio > 100) ? SR_ERR : SR_OK;
 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(uint32_t 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_UINT32,
 542                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 543                 break;
 544         case SR_CONF_DEVICE_OPTIONS:
 545                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 546                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_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         case SR_CONF_TRIGGER_MATCH:
 566                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 567                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 568                                 sizeof(int32_t));
 569                 break;
 570         default:
 571                 return SR_ERR_NA;
 572         }
 573
 574         return ret;
 575 }
 576
 577 static void abort_acquisition(struct dev_context *devc)
 578 {
 579         int i;
 580
 581         devc->sent_samples = -1;
 582
 583         for (i = devc->num_transfers - 1; i >= 0; i--) {
 584                 if (devc->transfers[i])
 585                         libusb_cancel_transfer(devc->transfers[i]);
 586         }
 587 }
 588
 589 static unsigned int bytes_per_ms(struct dev_context *devc)
 590 {
 591         return devc->cur_samplerate * devc->num_channels / 8000;
 592 }
 593
 594 static size_t get_buffer_size(struct dev_context *devc)
 595 {
 596         size_t s;
 597
 598         /*
 599          * The buffer should be large enough to hold 10ms of data and
 600          * a multiple of 512.
 601          */
 602         s = 10 * bytes_per_ms(devc);
 603         return (s + 511) & ~511;
 604 }
 605
 606 static unsigned int get_number_of_transfers(struct dev_context *devc)
 607 {
 608         unsigned int n;
 609
 610         /* Total buffer size should be able to hold about 500ms of data. */
 611         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 612
 613         if (n > NUM_SIMUL_TRANSFERS)
 614                 return NUM_SIMUL_TRANSFERS;
 615
 616         return n;
 617 }
 618
 619 static unsigned int get_timeout(struct dev_context *devc)
 620 {
 621         size_t total_size;
 622         unsigned int timeout;
 623
 624         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 625         timeout = total_size / bytes_per_ms(devc);
 626         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 627 }
 628
 629 static int configure_channels(const struct sr_dev_inst *sdi)
 630 {
 631         struct dev_context *devc;
 632         struct sr_channel *ch;
 633         GSList *l;
 634         uint16_t channel_bit;
 635
 636         devc = sdi->priv;
 637
 638         devc->cur_channels = 0;
 639         devc->num_channels = 0;
 640         for (l = sdi->channels; l; l = l->next) {
 641                 ch = (struct sr_channel *)l->data;
 642                 if (ch->enabled == FALSE)
 643                         continue;
 644
 645                 channel_bit = 1 << (ch->index);
 646
 647                 devc->cur_channels |= channel_bit;
 648
 649 #ifdef WORDS_BIGENDIAN
 650                 /*
 651                  * Output logic data should be stored in little endian format.
 652                  * To speed things up during conversion, do the switcharoo
 653                  * here instead.
 654                  */
 655                 channel_bit = 1 << (ch->index ^ 8);
 656 #endif
 657
 658                 devc->channel_masks[devc->num_channels++] = channel_bit;
 659         }
 660
 661         return SR_OK;
 662 }
 663
 664 static int receive_data(int fd, int revents, void *cb_data)
 665 {
 666         struct timeval tv;
 667         struct dev_context *devc;
 668         struct drv_context *drvc;
 669         const struct sr_dev_inst *sdi;
 670         struct sr_dev_driver *di;
 671
 672         (void)fd;
 673         (void)revents;
 674
 675         sdi = cb_data;
 676         di = sdi->driver;
 677         drvc = di->context;
 678         devc = sdi->priv;
 679
 680         tv.tv_sec = tv.tv_usec = 0;
 681         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 682
 683         if (devc->sent_samples == -2) {
 684                 logic16_abort_acquisition(sdi);
 685                 abort_acquisition(devc);
 686         }
 687
 688         return TRUE;
 689 }
 690
 691 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 692 {
 693         struct sr_dev_driver *di = sdi->driver;
 694         struct dev_context *devc;
 695         struct drv_context *drvc;
 696         struct sr_usb_dev_inst *usb;
 697         struct sr_trigger *trigger;
 698         struct libusb_transfer *transfer;
 699         unsigned int i, timeout, num_transfers;
 700         int ret;
 701         unsigned char *buf;
 702         size_t size, convsize;
 703
 704         if (sdi->status != SR_ST_ACTIVE)
 705                 return SR_ERR_DEV_CLOSED;
 706
 707         drvc = di->context;
 708         devc = sdi->priv;
 709         usb = sdi->conn;
 710
 711         /* Configures devc->cur_channels. */
 712         if (configure_channels(sdi) != SR_OK) {
 713                 sr_err("Failed to configure channels.");
 714                 return SR_ERR;
 715         }
 716
 717         devc->cb_data = cb_data;
 718         devc->sent_samples = 0;
 719         devc->empty_transfer_count = 0;
 720         devc->cur_channel = 0;
 721         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 722
 723         if ((trigger = sr_session_trigger_get(sdi->session))) {
 724                 int pre_trigger_samples = 0;
 725                 if (devc->limit_samples > 0)
 726                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 727                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 728                 if (!devc->stl)
 729                         return SR_ERR_MALLOC;
 730                 devc->trigger_fired = FALSE;
 731         } else
 732                 devc->trigger_fired = TRUE;
 733
 734         timeout = get_timeout(devc);
 735         num_transfers = get_number_of_transfers(devc);
 736         size = get_buffer_size(devc);
 737         convsize = (size / devc->num_channels + 2) * 16;
 738         devc->submitted_transfers = 0;
 739
 740         devc->convbuffer_size = convsize;
 741         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 742                 sr_err("Conversion buffer malloc failed.");
 743                 return SR_ERR_MALLOC;
 744         }
 745
 746         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 747         if (!devc->transfers) {
 748                 sr_err("USB transfers malloc failed.");
 749                 g_free(devc->convbuffer);
 750                 return SR_ERR_MALLOC;
 751         }
 752
 753         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 754                                              devc->cur_channels)) != SR_OK) {
 755                 g_free(devc->transfers);
 756                 g_free(devc->convbuffer);
 757                 return ret;
 758         }
 759
 760         devc->num_transfers = num_transfers;
 761         for (i = 0; i < num_transfers; i++) {
 762                 if (!(buf = g_try_malloc(size))) {
 763                         sr_err("USB transfer buffer malloc failed.");
 764                         if (devc->submitted_transfers)
 765                                 abort_acquisition(devc);
 766                         else {
 767                                 g_free(devc->transfers);
 768                                 g_free(devc->convbuffer);
 769                         }
 770                         return SR_ERR_MALLOC;
 771                 }
 772                 transfer = libusb_alloc_transfer(0);
 773                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 774                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 775                                 logic16_receive_transfer, (void *)sdi, timeout);
 776                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 777                         sr_err("Failed to submit transfer: %s.",
 778                                libusb_error_name(ret));
 779                         libusb_free_transfer(transfer);
 780                         g_free(buf);
 781                         abort_acquisition(devc);
 782                         return SR_ERR;
 783                 }
 784                 devc->transfers[i] = transfer;
 785                 devc->submitted_transfers++;
 786         }
 787
 788         devc->ctx = drvc->sr_ctx;
 789
 790         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 791
 792         std_session_send_df_header(cb_data, LOG_PREFIX);
 793
 794         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 795                 abort_acquisition(devc);
 796                 return ret;
 797         }
 798
 799         return SR_OK;
 800 }
 801
 802 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 803 {
 804         int ret;
 805
 806         (void)cb_data;
 807
 808         if (sdi->status != SR_ST_ACTIVE)
 809                 return SR_ERR_DEV_CLOSED;
 810
 811         ret = logic16_abort_acquisition(sdi);
 812
 813         abort_acquisition(sdi->priv);
 814
 815         return ret;
 816 }
 817
 818 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 819         .name = "saleae-logic16",
 820         .longname = "Saleae Logic16",
 821         .api_version = 1,
 822         .init = init,
 823         .cleanup = cleanup,
 824         .scan = scan,
 825         .dev_list = dev_list,
 826         .dev_clear = NULL,
 827         .config_get = config_get,
 828         .config_set = config_set,
 829         .config_list = config_list,
 830         .dev_open = dev_open,
 831         .dev_close = dev_close,
 832         .dev_acquisition_start = dev_acquisition_start,
 833         .dev_acquisition_stop = dev_acquisition_stop,
 834         .context = NULL,
 835 };