hardware/saleae-logic16/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   5  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   6  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <glib.h>
  23 #include <libusb.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <math.h>
  27 #include "libsigrok.h"
  28 #include "libsigrok-internal.h"
  29 #include "protocol.h"
  30
  31 #define LOGIC16_VID             0x21a9
  32 #define LOGIC16_PID             0x1001
  33
  34 #define USB_INTERFACE           0
  35 #define USB_CONFIGURATION       1
  36 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  37
  38 #define MAX_RENUM_DELAY_MS      3000
  39 #define NUM_SIMUL_TRANSFERS     32
  40
  41 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
  42 static struct sr_dev_driver *di = &saleae_logic16_driver_info;
  43
  44 static const int32_t hwopts[] = {
  45         SR_CONF_CONN,
  46 };
  47
  48 static const int32_t hwcaps[] = {
  49         SR_CONF_LOGIC_ANALYZER,
  50         SR_CONF_SAMPLERATE,
  51         SR_CONF_VOLTAGE_THRESHOLD,
  52         SR_CONF_TRIGGER_MATCH,
  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 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         NULL,
  71 };
  72
  73 static const struct {
  74         enum voltage_range range;
  75         gdouble low;
  76         gdouble high;
  77 } volt_thresholds[] = {
  78         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  79         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  80 };
  81
  82 static const uint64_t samplerates[] = {
  83         SR_KHZ(500),
  84         SR_MHZ(1),
  85         SR_MHZ(2),
  86         SR_MHZ(4),
  87         SR_MHZ(5),
  88         SR_MHZ(8),
  89         SR_MHZ(10),
  90         SR_KHZ(12500),
  91         SR_MHZ(16),
  92         SR_MHZ(25),
  93         SR_MHZ(32),
  94         SR_MHZ(40),
  95         SR_MHZ(80),
  96         SR_MHZ(100),
  97 };
  98
  99 static int init(struct sr_context *sr_ctx)
 100 {
 101         return std_init(sr_ctx, di, LOG_PREFIX);
 102 }
 103
 104 static gboolean check_conf_profile(libusb_device *dev)
 105 {
 106         struct libusb_device_descriptor des;
 107         struct libusb_device_handle *hdl;
 108         gboolean ret;
 109         unsigned char strdesc[64];
 110
 111         hdl = NULL;
 112         ret = FALSE;
 113         while (!ret) {
 114                 /* Assume the FW has not been loaded, unless proven wrong. */
 115                 if (libusb_get_device_descriptor(dev, &des) != 0)
 116                         break;
 117
 118                 if (libusb_open(dev, &hdl) != 0)
 119                         break;
 120
 121                 if (libusb_get_string_descriptor_ascii(hdl,
 122                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 123                         break;
 124                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 125                         break;
 126
 127                 if (libusb_get_string_descriptor_ascii(hdl,
 128                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 129                         break;
 130                 if (strcmp((const char *)strdesc, "Logic S/16"))
 131                         break;
 132
 133                 /* If we made it here, it must be a configured Logic16. */
 134                 ret = TRUE;
 135         }
 136         if (hdl)
 137                 libusb_close(hdl);
 138
 139         return ret;
 140 }
 141
 142 static GSList *scan(GSList *options)
 143 {
 144         struct drv_context *drvc;
 145         struct dev_context *devc;
 146         struct sr_dev_inst *sdi;
 147         struct sr_usb_dev_inst *usb;
 148         struct sr_channel *ch;
 149         struct sr_config *src;
 150         GSList *l, *devices, *conn_devices;
 151         struct libusb_device_descriptor des;
 152         libusb_device **devlist;
 153         int devcnt, ret, i, j;
 154         const char *conn;
 155
 156         drvc = di->priv;
 157
 158         conn = NULL;
 159         for (l = options; l; l = l->next) {
 160                 src = l->data;
 161                 switch (src->key) {
 162                 case SR_CONF_CONN:
 163                         conn = g_variant_get_string(src->data, NULL);
 164                         break;
 165                 }
 166         }
 167         if (conn)
 168                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 169         else
 170                 conn_devices = NULL;
 171
 172         /* Find all Logic16 devices and upload firmware to them. */
 173         devices = NULL;
 174         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 175         for (i = 0; devlist[i]; i++) {
 176                 if (conn) {
 177                         usb = NULL;
 178                         for (l = conn_devices; l; l = l->next) {
 179                                 usb = l->data;
 180                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 181                                     && usb->address == libusb_get_device_address(devlist[i]))
 182                                         break;
 183                         }
 184                         if (!l)
 185                                 /* This device matched none of the ones that
 186                                  * matched the conn specification. */
 187                                 continue;
 188                 }
 189
 190                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 191                         sr_warn("Failed to get device descriptor: %s.",
 192                                 libusb_error_name(ret));
 193                         continue;
 194                 }
 195
 196                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 197                         continue;
 198
 199                 devcnt = g_slist_length(drvc->instances);
 200                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 201                                       "Saleae", "Logic16", NULL);
 202                 if (!sdi)
 203                         return NULL;
 204                 sdi->driver = di;
 205
 206                 for (j = 0; channel_names[j]; j++) {
 207                         if (!(ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 208                                                    channel_names[j])))
 209                                 return NULL;
 210                         sdi->channels = g_slist_append(sdi->channels, ch);
 211                 }
 212
 213                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 214                         return NULL;
 215                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 216                 sdi->priv = devc;
 217                 drvc->instances = g_slist_append(drvc->instances, sdi);
 218                 devices = g_slist_append(devices, sdi);
 219
 220                 if (check_conf_profile(devlist[i])) {
 221                         /* Already has the firmware, so fix the new address. */
 222                         sr_dbg("Found a Logic16 device.");
 223                         sdi->status = SR_ST_INACTIVE;
 224                         sdi->inst_type = SR_INST_USB;
 225                         sdi->conn = sr_usb_dev_inst_new(
 226                                 libusb_get_bus_number(devlist[i]),
 227                                 libusb_get_device_address(devlist[i]), NULL);
 228                 } else {
 229                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 230                                                   FX2_FIRMWARE) == SR_OK)
 231                                 /* Store when this device's FW was updated. */
 232                                 devc->fw_updated = g_get_monotonic_time();
 233                         else
 234                                 sr_err("Firmware upload failed for "
 235                                        "device %d.", devcnt);
 236                         sdi->inst_type = SR_INST_USB;
 237                         sdi->conn = sr_usb_dev_inst_new(
 238                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 239                 }
 240         }
 241         libusb_free_device_list(devlist, 1);
 242         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 243
 244         return devices;
 245 }
 246
 247 static GSList *dev_list(void)
 248 {
 249         return ((struct drv_context *)(di->priv))->instances;
 250 }
 251
 252 static int logic16_dev_open(struct sr_dev_inst *sdi)
 253 {
 254         libusb_device **devlist;
 255         struct sr_usb_dev_inst *usb;
 256         struct libusb_device_descriptor des;
 257         struct drv_context *drvc;
 258         int ret, skip, i, device_count;
 259
 260         drvc = di->priv;
 261         usb = sdi->conn;
 262
 263         if (sdi->status == SR_ST_ACTIVE)
 264                 /* Device is already in use. */
 265                 return SR_ERR;
 266
 267         skip = 0;
 268         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 269         if (device_count < 0) {
 270                 sr_err("Failed to get device list: %s.",
 271                        libusb_error_name(device_count));
 272                 return SR_ERR;
 273         }
 274
 275         for (i = 0; i < device_count; i++) {
 276                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 277                         sr_err("Failed to get device descriptor: %s.",
 278                                libusb_error_name(ret));
 279                         continue;
 280                 }
 281
 282                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 283                         continue;
 284
 285                 if (sdi->status == SR_ST_INITIALIZING) {
 286                         if (skip != sdi->index) {
 287                                 /* Skip devices of this type that aren't the one we want. */
 288                                 skip += 1;
 289                                 continue;
 290                         }
 291                 } else if (sdi->status == SR_ST_INACTIVE) {
 292                         /*
 293                          * This device is fully enumerated, so we need to find
 294                          * this device by vendor, product, bus and address.
 295                          */
 296                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 297                             || libusb_get_device_address(devlist[i]) != usb->address)
 298                                 /* This is not the one. */
 299                                 continue;
 300                 }
 301
 302                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 303                         if (usb->address == 0xff)
 304                                 /*
 305                                  * First time we touch this device after FW
 306                                  * upload, so we don't know the address yet.
 307                                  */
 308                                 usb->address = libusb_get_device_address(devlist[i]);
 309                 } else {
 310                         sr_err("Failed to open device: %s.",
 311                                libusb_error_name(ret));
 312                         break;
 313                 }
 314
 315                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 316                 if (ret == LIBUSB_ERROR_BUSY) {
 317                         sr_err("Unable to claim USB interface. Another "
 318                                "program or driver has already claimed it.");
 319                         break;
 320                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 321                         sr_err("Device has been disconnected.");
 322                         break;
 323                 } else if (ret != 0) {
 324                         sr_err("Unable to claim interface: %s.",
 325                                libusb_error_name(ret));
 326                         break;
 327                 }
 328
 329                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 330                         sr_err("Failed to init device.");
 331                         break;
 332                 }
 333
 334                 sdi->status = SR_ST_ACTIVE;
 335                 sr_info("Opened device %d on %d.%d, interface %d.",
 336                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 337
 338                 break;
 339         }
 340         libusb_free_device_list(devlist, 1);
 341
 342         if (sdi->status != SR_ST_ACTIVE) {
 343                 if (usb->devhdl) {
 344                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 345                         libusb_close(usb->devhdl);
 346                         usb->devhdl = NULL;
 347                 }
 348                 return SR_ERR;
 349         }
 350
 351         return SR_OK;
 352 }
 353
 354 static int dev_open(struct sr_dev_inst *sdi)
 355 {
 356         struct dev_context *devc;
 357         int ret;
 358         int64_t timediff_us, timediff_ms;
 359
 360         devc = sdi->priv;
 361
 362         /*
 363          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 364          * milliseconds for the FX2 to renumerate.
 365          */
 366         ret = SR_ERR;
 367         if (devc->fw_updated > 0) {
 368                 sr_info("Waiting for device to reset.");
 369                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 370                 g_usleep(300 * 1000);
 371                 timediff_ms = 0;
 372                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 373                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 374                                 break;
 375                         g_usleep(100 * 1000);
 376
 377                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 378                         timediff_ms = timediff_us / 1000;
 379                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 380                 }
 381                 if (ret != SR_OK) {
 382                         sr_err("Device failed to renumerate.");
 383                         return SR_ERR;
 384                 }
 385                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 386         } else {
 387                 sr_info("Firmware upload was not needed.");
 388                 ret = logic16_dev_open(sdi);
 389         }
 390
 391         if (ret != SR_OK) {
 392                 sr_err("Unable to open device.");
 393                 return SR_ERR;
 394         }
 395
 396         if (devc->cur_samplerate == 0) {
 397                 /* Samplerate hasn't been set; default to the slowest one. */
 398                 devc->cur_samplerate = samplerates[0];
 399         }
 400
 401         return SR_OK;
 402 }
 403
 404 static int dev_close(struct sr_dev_inst *sdi)
 405 {
 406         struct sr_usb_dev_inst *usb;
 407
 408         usb = sdi->conn;
 409         if (usb->devhdl == NULL)
 410                 return SR_ERR;
 411
 412         sr_info("Closing device %d on %d.%d interface %d.",
 413                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 414         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 415         libusb_close(usb->devhdl);
 416         usb->devhdl = NULL;
 417         sdi->status = SR_ST_INACTIVE;
 418
 419         return SR_OK;
 420 }
 421
 422 static int cleanup(void)
 423 {
 424         int ret;
 425         struct drv_context *drvc;
 426
 427         if (!(drvc = di->priv))
 428                 /* Can get called on an unused driver, doesn't matter. */
 429                 return SR_OK;
 430
 431
 432         ret = std_dev_clear(di, NULL);
 433         g_free(drvc);
 434         di->priv = NULL;
 435
 436         return ret;
 437 }
 438
 439 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
 440                 const struct sr_channel_group *cg)
 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         (void)cg;
 450
 451         ret = SR_OK;
 452         switch (key) {
 453         case SR_CONF_CONN:
 454                 if (!sdi || !sdi->conn)
 455                         return SR_ERR_ARG;
 456                 usb = sdi->conn;
 457                 if (usb->address == 255)
 458                         /* Device still needs to re-enumerate after firmware
 459                          * upload, so we don't know its (future) address. */
 460                         return SR_ERR;
 461                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 462                 *data = g_variant_new_string(str);
 463                 break;
 464         case SR_CONF_SAMPLERATE:
 465                 if (!sdi)
 466                         return SR_ERR;
 467                 devc = sdi->priv;
 468                 *data = g_variant_new_uint64(devc->cur_samplerate);
 469                 break;
 470         case SR_CONF_VOLTAGE_THRESHOLD:
 471                 if (!sdi)
 472                         return SR_ERR;
 473                 devc = sdi->priv;
 474                 ret = SR_ERR;
 475                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 476                         if (devc->selected_voltage_range !=
 477                             volt_thresholds[i].range)
 478                                 continue;
 479                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 480                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 481                         *data = g_variant_new_tuple(range, 2);
 482                         ret = SR_OK;
 483                         break;
 484                 }
 485                 break;
 486         default:
 487                 return SR_ERR_NA;
 488         }
 489
 490         return ret;
 491 }
 492
 493 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
 494                 const struct sr_channel_group *cg)
 495 {
 496         struct dev_context *devc;
 497         gdouble low, high;
 498         int ret;
 499         unsigned int i;
 500
 501         (void)cg;
 502
 503         if (sdi->status != SR_ST_ACTIVE)
 504                 return SR_ERR_DEV_CLOSED;
 505
 506         devc = sdi->priv;
 507
 508         ret = SR_OK;
 509         switch (key) {
 510         case SR_CONF_SAMPLERATE:
 511                 devc->cur_samplerate = g_variant_get_uint64(data);
 512                 break;
 513         case SR_CONF_LIMIT_SAMPLES:
 514                 devc->limit_samples = g_variant_get_uint64(data);
 515                 break;
 516         case SR_CONF_VOLTAGE_THRESHOLD:
 517                 g_variant_get(data, "(dd)", &low, &high);
 518                 ret = SR_ERR_ARG;
 519                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 520                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 521                             fabs(volt_thresholds[i].high - high) < 0.1) {
 522                                 devc->selected_voltage_range =
 523                                         volt_thresholds[i].range;
 524                                 ret = SR_OK;
 525                                 break;
 526                         }
 527                 }
 528                 break;
 529         default:
 530                 ret = SR_ERR_NA;
 531         }
 532
 533         return ret;
 534 }
 535
 536 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 537                 const struct sr_channel_group *cg)
 538 {
 539         GVariant *gvar, *range[2];
 540         GVariantBuilder gvb;
 541         int ret;
 542         unsigned int i;
 543
 544         (void)sdi;
 545         (void)cg;
 546
 547         ret = SR_OK;
 548         switch (key) {
 549         case SR_CONF_SCAN_OPTIONS:
 550                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 551                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 552                 break;
 553         case SR_CONF_DEVICE_OPTIONS:
 554                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 555                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 556                 break;
 557         case SR_CONF_SAMPLERATE:
 558                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 559                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 560                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 561                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 562                 *data = g_variant_builder_end(&gvb);
 563                 break;
 564         case SR_CONF_VOLTAGE_THRESHOLD:
 565                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 566                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 567                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 568                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 569                         gvar = g_variant_new_tuple(range, 2);
 570                         g_variant_builder_add_value(&gvb, gvar);
 571                 }
 572                 *data = g_variant_builder_end(&gvb);
 573                 break;
 574         case SR_CONF_TRIGGER_MATCH:
 575                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 576                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 577                                 sizeof(int32_t));
 578                 break;
 579         default:
 580                 return SR_ERR_NA;
 581         }
 582
 583         return ret;
 584 }
 585
 586 static void abort_acquisition(struct dev_context *devc)
 587 {
 588         int i;
 589
 590         devc->sent_samples = -1;
 591
 592         for (i = devc->num_transfers - 1; i >= 0; i--) {
 593                 if (devc->transfers[i])
 594                         libusb_cancel_transfer(devc->transfers[i]);
 595         }
 596 }
 597
 598 static unsigned int bytes_per_ms(struct dev_context *devc)
 599 {
 600         return devc->cur_samplerate * devc->num_channels / 8000;
 601 }
 602
 603 static size_t get_buffer_size(struct dev_context *devc)
 604 {
 605         size_t s;
 606
 607         /*
 608          * The buffer should be large enough to hold 10ms of data and
 609          * a multiple of 512.
 610          */
 611         s = 10 * bytes_per_ms(devc);
 612         return (s + 511) & ~511;
 613 }
 614
 615 static unsigned int get_number_of_transfers(struct dev_context *devc)
 616 {
 617         unsigned int n;
 618
 619         /* Total buffer size should be able to hold about 500ms of data. */
 620         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 621
 622         if (n > NUM_SIMUL_TRANSFERS)
 623                 return NUM_SIMUL_TRANSFERS;
 624
 625         return n;
 626 }
 627
 628 static unsigned int get_timeout(struct dev_context *devc)
 629 {
 630         size_t total_size;
 631         unsigned int timeout;
 632
 633         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 634         timeout = total_size / bytes_per_ms(devc);
 635         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 636 }
 637
 638 static int configure_channels(const struct sr_dev_inst *sdi)
 639 {
 640         struct dev_context *devc;
 641         struct sr_channel *ch;
 642         GSList *l;
 643         uint16_t channel_bit;
 644
 645         devc = sdi->priv;
 646
 647         devc->cur_channels = 0;
 648         devc->num_channels = 0;
 649         for (l = sdi->channels; l; l = l->next) {
 650                 ch = (struct sr_channel *)l->data;
 651                 if (ch->enabled == FALSE)
 652                         continue;
 653
 654                 channel_bit = 1 << (ch->index);
 655
 656                 devc->cur_channels |= channel_bit;
 657
 658 #ifdef WORDS_BIGENDIAN
 659                 /*
 660                  * Output logic data should be stored in little endian format.
 661                  * To speed things up during conversion, do the switcharoo
 662                  * here instead.
 663                  */
 664                 channel_bit = 1 << (ch->index ^ 8);
 665 #endif
 666
 667                 devc->channel_masks[devc->num_channels++] = channel_bit;
 668         }
 669
 670         return SR_OK;
 671 }
 672
 673 static int receive_data(int fd, int revents, void *cb_data)
 674 {
 675         struct timeval tv;
 676         struct dev_context *devc;
 677         struct drv_context *drvc;
 678         const struct sr_dev_inst *sdi;
 679
 680         (void)fd;
 681         (void)revents;
 682
 683         sdi = cb_data;
 684         drvc = di->priv;
 685         devc = sdi->priv;
 686
 687         tv.tv_sec = tv.tv_usec = 0;
 688         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 689
 690         if (devc->sent_samples == -2) {
 691                 logic16_abort_acquisition(sdi);
 692                 abort_acquisition(devc);
 693         }
 694
 695         return TRUE;
 696 }
 697
 698 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 699 {
 700         struct dev_context *devc;
 701         struct drv_context *drvc;
 702         struct sr_usb_dev_inst *usb;
 703         struct sr_trigger *trigger;
 704         struct libusb_transfer *transfer;
 705         unsigned int i, timeout, num_transfers;
 706         int ret;
 707         unsigned char *buf;
 708         size_t size, convsize;
 709
 710         if (sdi->status != SR_ST_ACTIVE)
 711                 return SR_ERR_DEV_CLOSED;
 712
 713         drvc = di->priv;
 714         devc = sdi->priv;
 715         usb = sdi->conn;
 716
 717         /* Configures devc->cur_channels. */
 718         if (configure_channels(sdi) != SR_OK) {
 719                 sr_err("Failed to configure channels.");
 720                 return SR_ERR;
 721         }
 722
 723         devc->cb_data = cb_data;
 724         devc->sent_samples = 0;
 725         devc->empty_transfer_count = 0;
 726         devc->cur_channel = 0;
 727         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 728
 729         if ((trigger = sr_session_trigger_get(sdi->session))) {
 730                 devc->stl = soft_trigger_logic_new(sdi, trigger);
 731                 devc->trigger_fired = FALSE;
 732         } else
 733                 devc->trigger_fired = TRUE;
 734
 735         timeout = get_timeout(devc);
 736         num_transfers = get_number_of_transfers(devc);
 737         size = get_buffer_size(devc);
 738         convsize = (size / devc->num_channels + 2) * 16;
 739         devc->submitted_transfers = 0;
 740
 741         devc->convbuffer_size = convsize;
 742         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 743                 sr_err("Conversion buffer malloc failed.");
 744                 return SR_ERR_MALLOC;
 745         }
 746
 747         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 748         if (!devc->transfers) {
 749                 sr_err("USB transfers malloc failed.");
 750                 g_free(devc->convbuffer);
 751                 return SR_ERR_MALLOC;
 752         }
 753
 754         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 755                                              devc->cur_channels)) != SR_OK) {
 756                 g_free(devc->transfers);
 757                 g_free(devc->convbuffer);
 758                 return ret;
 759         }
 760
 761         devc->num_transfers = num_transfers;
 762         for (i = 0; i < num_transfers; i++) {
 763                 if (!(buf = g_try_malloc(size))) {
 764                         sr_err("USB transfer buffer malloc failed.");
 765                         if (devc->submitted_transfers)
 766                                 abort_acquisition(devc);
 767                         else {
 768                                 g_free(devc->transfers);
 769                                 g_free(devc->convbuffer);
 770                         }
 771                         return SR_ERR_MALLOC;
 772                 }
 773                 transfer = libusb_alloc_transfer(0);
 774                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 775                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 776                                 logic16_receive_transfer, (void *)sdi, timeout);
 777                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 778                         sr_err("Failed to submit transfer: %s.",
 779                                libusb_error_name(ret));
 780                         libusb_free_transfer(transfer);
 781                         g_free(buf);
 782                         abort_acquisition(devc);
 783                         return SR_ERR;
 784                 }
 785                 devc->transfers[i] = transfer;
 786                 devc->submitted_transfers++;
 787         }
 788
 789         devc->ctx = drvc->sr_ctx;
 790
 791         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 792
 793         /* Send header packet to the session bus. */
 794         std_session_send_df_header(cb_data, LOG_PREFIX);
 795
 796         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 797                 abort_acquisition(devc);
 798                 return ret;
 799         }
 800
 801         return SR_OK;
 802 }
 803
 804 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 805 {
 806         int ret;
 807
 808         (void)cb_data;
 809
 810         if (sdi->status != SR_ST_ACTIVE)
 811                 return SR_ERR_DEV_CLOSED;
 812
 813         ret = logic16_abort_acquisition(sdi);
 814
 815         abort_acquisition(sdi->priv);
 816
 817         return ret;
 818 }
 819
 820 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 821         .name = "saleae-logic16",
 822         .longname = "Saleae Logic16",
 823         .api_version = 1,
 824         .init = init,
 825         .cleanup = cleanup,
 826         .scan = scan,
 827         .dev_list = dev_list,
 828         .dev_clear = NULL,
 829         .config_get = config_get,
 830         .config_set = config_set,
 831         .config_list = config_list,
 832         .dev_open = dev_open,
 833         .dev_close = dev_close,
 834         .dev_acquisition_start = dev_acquisition_start,
 835         .dev_acquisition_stop = dev_acquisition_stop,
 836         .priv = NULL,
 837 };