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 <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 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         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_config *src;
 149         GSList *l, *devices, *conn_devices;
 150         struct libusb_device_descriptor des;
 151         libusb_device **devlist;
 152         int ret, i, j;
 153         const char *conn;
 154         char connection_id[64];
 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                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 197
 198                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 199                         continue;
 200
 201                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 202                 sdi->status = SR_ST_INITIALIZING;
 203                 sdi->vendor = g_strdup("Saleae");
 204                 sdi->model = g_strdup("Logic16");
 205                 sdi->driver = di;
 206                 sdi->connection_id = g_strdup(connection_id);
 207
 208                 for (j = 0; channel_names[j]; j++)
 209                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 210                                             channel_names[j]);
 211
 212                 devc = g_malloc0(sizeof(struct dev_context));
 213                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 214                 sdi->priv = devc;
 215                 drvc->instances = g_slist_append(drvc->instances, sdi);
 216                 devices = g_slist_append(devices, sdi);
 217
 218                 if (check_conf_profile(devlist[i])) {
 219                         /* Already has the firmware, so fix the new address. */
 220                         sr_dbg("Found a Logic16 device.");
 221                         sdi->status = SR_ST_INACTIVE;
 222                         sdi->inst_type = SR_INST_USB;
 223                         sdi->conn = sr_usb_dev_inst_new(
 224                                 libusb_get_bus_number(devlist[i]),
 225                                 libusb_get_device_address(devlist[i]), NULL);
 226                 } else {
 227                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 228                                                   FX2_FIRMWARE) == SR_OK)
 229                                 /* Store when this device's FW was updated. */
 230                                 devc->fw_updated = g_get_monotonic_time();
 231                         else
 232                                 sr_err("Firmware upload failed.");
 233                         sdi->inst_type = SR_INST_USB;
 234                         sdi->conn = sr_usb_dev_inst_new(
 235                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 236                 }
 237         }
 238         libusb_free_device_list(devlist, 1);
 239         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 240
 241         return devices;
 242 }
 243
 244 static GSList *dev_list(void)
 245 {
 246         return ((struct drv_context *)(di->priv))->instances;
 247 }
 248
 249 static int logic16_dev_open(struct sr_dev_inst *sdi)
 250 {
 251         libusb_device **devlist;
 252         struct sr_usb_dev_inst *usb;
 253         struct libusb_device_descriptor des;
 254         struct drv_context *drvc;
 255         int ret, i, device_count;
 256         char connection_id[64];
 257
 258         drvc = di->priv;
 259         usb = sdi->conn;
 260
 261         if (sdi->status == SR_ST_ACTIVE)
 262                 /* Device is already in use. */
 263                 return SR_ERR;
 264
 265         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 266         if (device_count < 0) {
 267                 sr_err("Failed to get device list: %s.",
 268                        libusb_error_name(device_count));
 269                 return SR_ERR;
 270         }
 271
 272         for (i = 0; i < device_count; i++) {
 273                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 274                         sr_err("Failed to get device descriptor: %s.",
 275                                libusb_error_name(ret));
 276                         continue;
 277                 }
 278
 279                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 280                         continue;
 281
 282                 if ((sdi->status == SR_ST_INITIALIZING) ||
 283                                 (sdi->status == SR_ST_INACTIVE)) {
 284                         /*
 285                          * Check device by its physical USB bus/port address.
 286                          */
 287                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 288                         if (strcmp(sdi->connection_id, connection_id))
 289                                 /* This is not the one. */
 290                                 continue;
 291                 }
 292
 293                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 294                         if (usb->address == 0xff)
 295                                 /*
 296                                  * First time we touch this device after FW
 297                                  * upload, so we don't know the address yet.
 298                                  */
 299                                 usb->address = libusb_get_device_address(devlist[i]);
 300                 } else {
 301                         sr_err("Failed to open device: %s.",
 302                                libusb_error_name(ret));
 303                         break;
 304                 }
 305
 306                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 307                 if (ret == LIBUSB_ERROR_BUSY) {
 308                         sr_err("Unable to claim USB interface. Another "
 309                                "program or driver has already claimed it.");
 310                         break;
 311                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 312                         sr_err("Device has been disconnected.");
 313                         break;
 314                 } else if (ret != 0) {
 315                         sr_err("Unable to claim interface: %s.",
 316                                libusb_error_name(ret));
 317                         break;
 318                 }
 319
 320                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 321                         sr_err("Failed to init device.");
 322                         break;
 323                 }
 324
 325                 sdi->status = SR_ST_ACTIVE;
 326                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 327                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 328
 329                 break;
 330         }
 331         libusb_free_device_list(devlist, 1);
 332
 333         if (sdi->status != SR_ST_ACTIVE) {
 334                 if (usb->devhdl) {
 335                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 336                         libusb_close(usb->devhdl);
 337                         usb->devhdl = NULL;
 338                 }
 339                 return SR_ERR;
 340         }
 341
 342         return SR_OK;
 343 }
 344
 345 static int dev_open(struct sr_dev_inst *sdi)
 346 {
 347         struct dev_context *devc;
 348         int ret;
 349         int64_t timediff_us, timediff_ms;
 350
 351         devc = sdi->priv;
 352
 353         /*
 354          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 355          * milliseconds for the FX2 to renumerate.
 356          */
 357         ret = SR_ERR;
 358         if (devc->fw_updated > 0) {
 359                 sr_info("Waiting for device to reset.");
 360                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 361                 g_usleep(300 * 1000);
 362                 timediff_ms = 0;
 363                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 364                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 365                                 break;
 366                         g_usleep(100 * 1000);
 367
 368                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 369                         timediff_ms = timediff_us / 1000;
 370                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 371                 }
 372                 if (ret != SR_OK) {
 373                         sr_err("Device failed to renumerate.");
 374                         return SR_ERR;
 375                 }
 376                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 377         } else {
 378                 sr_info("Firmware upload was not needed.");
 379                 ret = logic16_dev_open(sdi);
 380         }
 381
 382         if (ret != SR_OK) {
 383                 sr_err("Unable to open device.");
 384                 return SR_ERR;
 385         }
 386
 387         if (devc->cur_samplerate == 0) {
 388                 /* Samplerate hasn't been set; default to the slowest one. */
 389                 devc->cur_samplerate = samplerates[0];
 390         }
 391
 392         return SR_OK;
 393 }
 394
 395 static int dev_close(struct sr_dev_inst *sdi)
 396 {
 397         struct sr_usb_dev_inst *usb;
 398
 399         usb = sdi->conn;
 400         if (usb->devhdl == NULL)
 401                 return SR_ERR;
 402
 403         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 404                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 405         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 406         libusb_close(usb->devhdl);
 407         usb->devhdl = NULL;
 408         sdi->status = SR_ST_INACTIVE;
 409
 410         return SR_OK;
 411 }
 412
 413 static int cleanup(void)
 414 {
 415         int ret;
 416         struct drv_context *drvc;
 417
 418         if (!(drvc = di->priv))
 419                 /* Can get called on an unused driver, doesn't matter. */
 420                 return SR_OK;
 421
 422         ret = std_dev_clear(di, NULL);
 423         g_free(drvc);
 424         di->priv = NULL;
 425
 426         return ret;
 427 }
 428
 429 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 430                 const struct sr_channel_group *cg)
 431 {
 432         struct dev_context *devc;
 433         struct sr_usb_dev_inst *usb;
 434         GVariant *range[2];
 435         char str[128];
 436         int ret;
 437         unsigned int i;
 438
 439         (void)cg;
 440
 441         ret = SR_OK;
 442         switch (key) {
 443         case SR_CONF_CONN:
 444                 if (!sdi || !sdi->conn)
 445                         return SR_ERR_ARG;
 446                 usb = sdi->conn;
 447                 if (usb->address == 255)
 448                         /* Device still needs to re-enumerate after firmware
 449                          * upload, so we don't know its (future) address. */
 450                         return SR_ERR;
 451                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 452                 *data = g_variant_new_string(str);
 453                 break;
 454         case SR_CONF_SAMPLERATE:
 455                 if (!sdi)
 456                         return SR_ERR;
 457                 devc = sdi->priv;
 458                 *data = g_variant_new_uint64(devc->cur_samplerate);
 459                 break;
 460         case SR_CONF_CAPTURE_RATIO:
 461                 if (!sdi)
 462                         return SR_ERR;
 463                 devc = sdi->priv;
 464                 *data = g_variant_new_uint64(devc->capture_ratio);
 465                 break;
 466         case SR_CONF_VOLTAGE_THRESHOLD:
 467                 if (!sdi)
 468                         return SR_ERR;
 469                 devc = sdi->priv;
 470                 ret = SR_ERR;
 471                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 472                         if (devc->selected_voltage_range !=
 473                             volt_thresholds[i].range)
 474                                 continue;
 475                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 476                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 477                         *data = g_variant_new_tuple(range, 2);
 478                         ret = SR_OK;
 479                         break;
 480                 }
 481                 break;
 482         default:
 483                 return SR_ERR_NA;
 484         }
 485
 486         return ret;
 487 }
 488
 489 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 490                 const struct sr_channel_group *cg)
 491 {
 492         struct dev_context *devc;
 493         gdouble low, high;
 494         int ret;
 495         unsigned int i;
 496
 497         (void)cg;
 498
 499         if (sdi->status != SR_ST_ACTIVE)
 500                 return SR_ERR_DEV_CLOSED;
 501
 502         devc = sdi->priv;
 503
 504         ret = SR_OK;
 505         switch (key) {
 506         case SR_CONF_SAMPLERATE:
 507                 devc->cur_samplerate = g_variant_get_uint64(data);
 508                 break;
 509         case SR_CONF_LIMIT_SAMPLES:
 510                 devc->limit_samples = g_variant_get_uint64(data);
 511                 break;
 512         case SR_CONF_CAPTURE_RATIO:
 513                 devc->capture_ratio = g_variant_get_uint64(data);
 514                 if (devc->capture_ratio > 100) {
 515                         devc->capture_ratio = 0;
 516                         ret = SR_ERR;
 517                 } else
 518                         ret = SR_OK;
 519                 break;
 520         case SR_CONF_VOLTAGE_THRESHOLD:
 521                 g_variant_get(data, "(dd)", &low, &high);
 522                 ret = SR_ERR_ARG;
 523                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 524                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 525                             fabs(volt_thresholds[i].high - high) < 0.1) {
 526                                 devc->selected_voltage_range =
 527                                         volt_thresholds[i].range;
 528                                 ret = SR_OK;
 529                                 break;
 530                         }
 531                 }
 532                 break;
 533         default:
 534                 ret = SR_ERR_NA;
 535         }
 536
 537         return ret;
 538 }
 539
 540 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 541                 const struct sr_channel_group *cg)
 542 {
 543         GVariant *gvar, *range[2];
 544         GVariantBuilder gvb;
 545         int ret;
 546         unsigned int i;
 547
 548         (void)sdi;
 549         (void)cg;
 550
 551         ret = SR_OK;
 552         switch (key) {
 553         case SR_CONF_SCAN_OPTIONS:
 554                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 555                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 556                 break;
 557         case SR_CONF_DEVICE_OPTIONS:
 558                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 559                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 560                 break;
 561         case SR_CONF_SAMPLERATE:
 562                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 563                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 564                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 565                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 566                 *data = g_variant_builder_end(&gvb);
 567                 break;
 568         case SR_CONF_VOLTAGE_THRESHOLD:
 569                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 570                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 571                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 572                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 573                         gvar = g_variant_new_tuple(range, 2);
 574                         g_variant_builder_add_value(&gvb, gvar);
 575                 }
 576                 *data = g_variant_builder_end(&gvb);
 577                 break;
 578         case SR_CONF_TRIGGER_MATCH:
 579                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 580                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 581                                 sizeof(int32_t));
 582                 break;
 583         default:
 584                 return SR_ERR_NA;
 585         }
 586
 587         return ret;
 588 }
 589
 590 static void abort_acquisition(struct dev_context *devc)
 591 {
 592         int i;
 593
 594         devc->sent_samples = -1;
 595
 596         for (i = devc->num_transfers - 1; i >= 0; i--) {
 597                 if (devc->transfers[i])
 598                         libusb_cancel_transfer(devc->transfers[i]);
 599         }
 600 }
 601
 602 static unsigned int bytes_per_ms(struct dev_context *devc)
 603 {
 604         return devc->cur_samplerate * devc->num_channels / 8000;
 605 }
 606
 607 static size_t get_buffer_size(struct dev_context *devc)
 608 {
 609         size_t s;
 610
 611         /*
 612          * The buffer should be large enough to hold 10ms of data and
 613          * a multiple of 512.
 614          */
 615         s = 10 * bytes_per_ms(devc);
 616         return (s + 511) & ~511;
 617 }
 618
 619 static unsigned int get_number_of_transfers(struct dev_context *devc)
 620 {
 621         unsigned int n;
 622
 623         /* Total buffer size should be able to hold about 500ms of data. */
 624         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 625
 626         if (n > NUM_SIMUL_TRANSFERS)
 627                 return NUM_SIMUL_TRANSFERS;
 628
 629         return n;
 630 }
 631
 632 static unsigned int get_timeout(struct dev_context *devc)
 633 {
 634         size_t total_size;
 635         unsigned int timeout;
 636
 637         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 638         timeout = total_size / bytes_per_ms(devc);
 639         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 640 }
 641
 642 static int configure_channels(const struct sr_dev_inst *sdi)
 643 {
 644         struct dev_context *devc;
 645         struct sr_channel *ch;
 646         GSList *l;
 647         uint16_t channel_bit;
 648
 649         devc = sdi->priv;
 650
 651         devc->cur_channels = 0;
 652         devc->num_channels = 0;
 653         for (l = sdi->channels; l; l = l->next) {
 654                 ch = (struct sr_channel *)l->data;
 655                 if (ch->enabled == FALSE)
 656                         continue;
 657
 658                 channel_bit = 1 << (ch->index);
 659
 660                 devc->cur_channels |= channel_bit;
 661
 662 #ifdef WORDS_BIGENDIAN
 663                 /*
 664                  * Output logic data should be stored in little endian format.
 665                  * To speed things up during conversion, do the switcharoo
 666                  * here instead.
 667                  */
 668                 channel_bit = 1 << (ch->index ^ 8);
 669 #endif
 670
 671                 devc->channel_masks[devc->num_channels++] = channel_bit;
 672         }
 673
 674         return SR_OK;
 675 }
 676
 677 static int receive_data(int fd, int revents, void *cb_data)
 678 {
 679         struct timeval tv;
 680         struct dev_context *devc;
 681         struct drv_context *drvc;
 682         const struct sr_dev_inst *sdi;
 683
 684         (void)fd;
 685         (void)revents;
 686
 687         sdi = cb_data;
 688         drvc = di->priv;
 689         devc = sdi->priv;
 690
 691         tv.tv_sec = tv.tv_usec = 0;
 692         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 693
 694         if (devc->sent_samples == -2) {
 695                 logic16_abort_acquisition(sdi);
 696                 abort_acquisition(devc);
 697         }
 698
 699         return TRUE;
 700 }
 701
 702 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 703 {
 704         struct dev_context *devc;
 705         struct drv_context *drvc;
 706         struct sr_usb_dev_inst *usb;
 707         struct sr_trigger *trigger;
 708         struct libusb_transfer *transfer;
 709         unsigned int i, timeout, num_transfers;
 710         int ret;
 711         unsigned char *buf;
 712         size_t size, convsize;
 713
 714         if (sdi->status != SR_ST_ACTIVE)
 715                 return SR_ERR_DEV_CLOSED;
 716
 717         drvc = di->priv;
 718         devc = sdi->priv;
 719         usb = sdi->conn;
 720
 721         /* Configures devc->cur_channels. */
 722         if (configure_channels(sdi) != SR_OK) {
 723                 sr_err("Failed to configure channels.");
 724                 return SR_ERR;
 725         }
 726
 727         devc->cb_data = cb_data;
 728         devc->sent_samples = 0;
 729         devc->empty_transfer_count = 0;
 730         devc->cur_channel = 0;
 731         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 732
 733         if ((trigger = sr_session_trigger_get(sdi->session))) {
 734                 int pre_trigger_samples = 0;
 735                 if (devc->limit_samples > 0)
 736                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 737                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 738                 if (devc->stl == NULL)
 739                         return SR_ERR_MALLOC;
 740                 devc->trigger_fired = FALSE;
 741         } else
 742                 devc->trigger_fired = TRUE;
 743
 744         timeout = get_timeout(devc);
 745         num_transfers = get_number_of_transfers(devc);
 746         size = get_buffer_size(devc);
 747         convsize = (size / devc->num_channels + 2) * 16;
 748         devc->submitted_transfers = 0;
 749
 750         devc->convbuffer_size = convsize;
 751         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 752                 sr_err("Conversion buffer malloc failed.");
 753                 return SR_ERR_MALLOC;
 754         }
 755
 756         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 757         if (!devc->transfers) {
 758                 sr_err("USB transfers malloc failed.");
 759                 g_free(devc->convbuffer);
 760                 return SR_ERR_MALLOC;
 761         }
 762
 763         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 764                                              devc->cur_channels)) != SR_OK) {
 765                 g_free(devc->transfers);
 766                 g_free(devc->convbuffer);
 767                 return ret;
 768         }
 769
 770         devc->num_transfers = num_transfers;
 771         for (i = 0; i < num_transfers; i++) {
 772                 if (!(buf = g_try_malloc(size))) {
 773                         sr_err("USB transfer buffer malloc failed.");
 774                         if (devc->submitted_transfers)
 775                                 abort_acquisition(devc);
 776                         else {
 777                                 g_free(devc->transfers);
 778                                 g_free(devc->convbuffer);
 779                         }
 780                         return SR_ERR_MALLOC;
 781                 }
 782                 transfer = libusb_alloc_transfer(0);
 783                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 784                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 785                                 logic16_receive_transfer, (void *)sdi, timeout);
 786                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 787                         sr_err("Failed to submit transfer: %s.",
 788                                libusb_error_name(ret));
 789                         libusb_free_transfer(transfer);
 790                         g_free(buf);
 791                         abort_acquisition(devc);
 792                         return SR_ERR;
 793                 }
 794                 devc->transfers[i] = transfer;
 795                 devc->submitted_transfers++;
 796         }
 797
 798         devc->ctx = drvc->sr_ctx;
 799
 800         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 801
 802         /* Send header packet to the session bus. */
 803         std_session_send_df_header(cb_data, LOG_PREFIX);
 804
 805         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 806                 abort_acquisition(devc);
 807                 return ret;
 808         }
 809
 810         return SR_OK;
 811 }
 812
 813 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 814 {
 815         int ret;
 816
 817         (void)cb_data;
 818
 819         if (sdi->status != SR_ST_ACTIVE)
 820                 return SR_ERR_DEV_CLOSED;
 821
 822         ret = logic16_abort_acquisition(sdi);
 823
 824         abort_acquisition(sdi->priv);
 825
 826         return ret;
 827 }
 828
 829 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 830         .name = "saleae-logic16",
 831         .longname = "Saleae Logic16",
 832         .api_version = 1,
 833         .init = init,
 834         .cleanup = cleanup,
 835         .scan = scan,
 836         .dev_list = dev_list,
 837         .dev_clear = NULL,
 838         .config_get = config_get,
 839         .config_set = config_set,
 840         .config_list = config_list,
 841         .dev_open = dev_open,
 842         .dev_close = dev_close,
 843         .dev_acquisition_start = dev_acquisition_start,
 844         .dev_acquisition_stop = dev_acquisition_stop,
 845         .priv = NULL,
 846 };