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 };
  57
  58 static const int32_t soft_trigger_matches[] = {
  59         SR_TRIGGER_ZERO,
  60         SR_TRIGGER_ONE,
  61         SR_TRIGGER_RISING,
  62         SR_TRIGGER_FALLING,
  63         SR_TRIGGER_EDGE,
  64 };
  65
  66 static const char *channel_names[] = {
  67         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  68         "9", "10", "11", "12", "13", "14", "15",
  69         NULL,
  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_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                 if (libusb_get_device_descriptor(dev, &des) != 0)
 115                         break;
 116
 117                 if (libusb_open(dev, &hdl) != 0)
 118                         break;
 119
 120                 if (libusb_get_string_descriptor_ascii(hdl,
 121                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 122                         break;
 123                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 124                         break;
 125
 126                 if (libusb_get_string_descriptor_ascii(hdl,
 127                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 128                         break;
 129                 if (strcmp((const char *)strdesc, "Logic S/16"))
 130                         break;
 131
 132                 /* If we made it here, it must be a configured Logic16. */
 133                 ret = TRUE;
 134         }
 135         if (hdl)
 136                 libusb_close(hdl);
 137
 138         return ret;
 139 }
 140
 141 static GSList *scan(GSList *options)
 142 {
 143         struct drv_context *drvc;
 144         struct dev_context *devc;
 145         struct sr_dev_inst *sdi;
 146         struct sr_usb_dev_inst *usb;
 147         struct sr_channel *ch;
 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 = sr_dev_inst_new(SR_ST_INITIALIZING,
 202                                       "Saleae", "Logic16", NULL);
 203                 if (!sdi)
 204                         return NULL;
 205                 sdi->driver = di;
 206                 sdi->connection_id = g_strdup(connection_id);
 207
 208                 for (j = 0; channel_names[j]; j++) {
 209                         if (!(ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 210                                                    channel_names[j])))
 211                                 return NULL;
 212                         sdi->channels = g_slist_append(sdi->channels, ch);
 213                 }
 214
 215                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 216                         return NULL;
 217                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 218                 sdi->priv = devc;
 219                 drvc->instances = g_slist_append(drvc->instances, sdi);
 220                 devices = g_slist_append(devices, sdi);
 221
 222                 if (check_conf_profile(devlist[i])) {
 223                         /* Already has the firmware, so fix the new address. */
 224                         sr_dbg("Found a Logic16 device.");
 225                         sdi->status = SR_ST_INACTIVE;
 226                         sdi->inst_type = SR_INST_USB;
 227                         sdi->conn = sr_usb_dev_inst_new(
 228                                 libusb_get_bus_number(devlist[i]),
 229                                 libusb_get_device_address(devlist[i]), NULL);
 230                 } else {
 231                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 232                                                   FX2_FIRMWARE) == SR_OK)
 233                                 /* Store when this device's FW was updated. */
 234                                 devc->fw_updated = g_get_monotonic_time();
 235                         else
 236                                 sr_err("Firmware upload failed.");
 237                         sdi->inst_type = SR_INST_USB;
 238                         sdi->conn = sr_usb_dev_inst_new(
 239                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 240                 }
 241         }
 242         libusb_free_device_list(devlist, 1);
 243         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 244
 245         return devices;
 246 }
 247
 248 static GSList *dev_list(void)
 249 {
 250         return ((struct drv_context *)(di->priv))->instances;
 251 }
 252
 253 static int logic16_dev_open(struct sr_dev_inst *sdi)
 254 {
 255         libusb_device **devlist;
 256         struct sr_usb_dev_inst *usb;
 257         struct libusb_device_descriptor des;
 258         struct drv_context *drvc;
 259         int ret, i, device_count;
 260         char connection_id[64];
 261
 262         drvc = di->priv;
 263         usb = sdi->conn;
 264
 265         if (sdi->status == SR_ST_ACTIVE)
 266                 /* Device is already in use. */
 267                 return SR_ERR;
 268
 269         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 270         if (device_count < 0) {
 271                 sr_err("Failed to get device list: %s.",
 272                        libusb_error_name(device_count));
 273                 return SR_ERR;
 274         }
 275
 276         for (i = 0; i < device_count; i++) {
 277                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 278                         sr_err("Failed to get device descriptor: %s.",
 279                                libusb_error_name(ret));
 280                         continue;
 281                 }
 282
 283                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 284                         continue;
 285
 286                 if ((sdi->status == SR_ST_INITIALIZING) ||
 287                                 (sdi->status == SR_ST_INACTIVE)) {
 288                         /*
 289                          * Check device by its physical USB bus/port address.
 290                          */
 291                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 292                         if (strcmp(sdi->connection_id, connection_id))
 293                                 /* This is not the one. */
 294                                 continue;
 295                 }
 296
 297                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 298                         if (usb->address == 0xff)
 299                                 /*
 300                                  * First time we touch this device after FW
 301                                  * upload, so we don't know the address yet.
 302                                  */
 303                                 usb->address = libusb_get_device_address(devlist[i]);
 304                 } else {
 305                         sr_err("Failed to open device: %s.",
 306                                libusb_error_name(ret));
 307                         break;
 308                 }
 309
 310                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 311                 if (ret == LIBUSB_ERROR_BUSY) {
 312                         sr_err("Unable to claim USB interface. Another "
 313                                "program or driver has already claimed it.");
 314                         break;
 315                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 316                         sr_err("Device has been disconnected.");
 317                         break;
 318                 } else if (ret != 0) {
 319                         sr_err("Unable to claim interface: %s.",
 320                                libusb_error_name(ret));
 321                         break;
 322                 }
 323
 324                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 325                         sr_err("Failed to init device.");
 326                         break;
 327                 }
 328
 329                 sdi->status = SR_ST_ACTIVE;
 330                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 331                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 332
 333                 break;
 334         }
 335         libusb_free_device_list(devlist, 1);
 336
 337         if (sdi->status != SR_ST_ACTIVE) {
 338                 if (usb->devhdl) {
 339                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 340                         libusb_close(usb->devhdl);
 341                         usb->devhdl = NULL;
 342                 }
 343                 return SR_ERR;
 344         }
 345
 346         return SR_OK;
 347 }
 348
 349 static int dev_open(struct sr_dev_inst *sdi)
 350 {
 351         struct dev_context *devc;
 352         int ret;
 353         int64_t timediff_us, timediff_ms;
 354
 355         devc = sdi->priv;
 356
 357         /*
 358          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 359          * milliseconds for the FX2 to renumerate.
 360          */
 361         ret = SR_ERR;
 362         if (devc->fw_updated > 0) {
 363                 sr_info("Waiting for device to reset.");
 364                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 365                 g_usleep(300 * 1000);
 366                 timediff_ms = 0;
 367                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 368                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 369                                 break;
 370                         g_usleep(100 * 1000);
 371
 372                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 373                         timediff_ms = timediff_us / 1000;
 374                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 375                 }
 376                 if (ret != SR_OK) {
 377                         sr_err("Device failed to renumerate.");
 378                         return SR_ERR;
 379                 }
 380                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 381         } else {
 382                 sr_info("Firmware upload was not needed.");
 383                 ret = logic16_dev_open(sdi);
 384         }
 385
 386         if (ret != SR_OK) {
 387                 sr_err("Unable to open device.");
 388                 return SR_ERR;
 389         }
 390
 391         if (devc->cur_samplerate == 0) {
 392                 /* Samplerate hasn't been set; default to the slowest one. */
 393                 devc->cur_samplerate = samplerates[0];
 394         }
 395
 396         return SR_OK;
 397 }
 398
 399 static int dev_close(struct sr_dev_inst *sdi)
 400 {
 401         struct sr_usb_dev_inst *usb;
 402
 403         usb = sdi->conn;
 404         if (usb->devhdl == NULL)
 405                 return SR_ERR;
 406
 407         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 408                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 409         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 410         libusb_close(usb->devhdl);
 411         usb->devhdl = NULL;
 412         sdi->status = SR_ST_INACTIVE;
 413
 414         return SR_OK;
 415 }
 416
 417 static int cleanup(void)
 418 {
 419         int ret;
 420         struct drv_context *drvc;
 421
 422         if (!(drvc = di->priv))
 423                 /* Can get called on an unused driver, doesn't matter. */
 424                 return SR_OK;
 425
 426         ret = std_dev_clear(di, NULL);
 427         g_free(drvc);
 428         di->priv = NULL;
 429
 430         return ret;
 431 }
 432
 433 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 434                 const struct sr_channel_group *cg)
 435 {
 436         struct dev_context *devc;
 437         struct sr_usb_dev_inst *usb;
 438         GVariant *range[2];
 439         char str[128];
 440         int ret;
 441         unsigned int i;
 442
 443         (void)cg;
 444
 445         ret = SR_OK;
 446         switch (key) {
 447         case SR_CONF_CONN:
 448                 if (!sdi || !sdi->conn)
 449                         return SR_ERR_ARG;
 450                 usb = sdi->conn;
 451                 if (usb->address == 255)
 452                         /* Device still needs to re-enumerate after firmware
 453                          * upload, so we don't know its (future) address. */
 454                         return SR_ERR;
 455                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 456                 *data = g_variant_new_string(str);
 457                 break;
 458         case SR_CONF_SAMPLERATE:
 459                 if (!sdi)
 460                         return SR_ERR;
 461                 devc = sdi->priv;
 462                 *data = g_variant_new_uint64(devc->cur_samplerate);
 463                 break;
 464         case SR_CONF_VOLTAGE_THRESHOLD:
 465                 if (!sdi)
 466                         return SR_ERR;
 467                 devc = sdi->priv;
 468                 ret = SR_ERR;
 469                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 470                         if (devc->selected_voltage_range !=
 471                             volt_thresholds[i].range)
 472                                 continue;
 473                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 474                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 475                         *data = g_variant_new_tuple(range, 2);
 476                         ret = SR_OK;
 477                         break;
 478                 }
 479                 break;
 480         default:
 481                 return SR_ERR_NA;
 482         }
 483
 484         return ret;
 485 }
 486
 487 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 488                 const struct sr_channel_group *cg)
 489 {
 490         struct dev_context *devc;
 491         gdouble low, high;
 492         int ret;
 493         unsigned int i;
 494
 495         (void)cg;
 496
 497         if (sdi->status != SR_ST_ACTIVE)
 498                 return SR_ERR_DEV_CLOSED;
 499
 500         devc = sdi->priv;
 501
 502         ret = SR_OK;
 503         switch (key) {
 504         case SR_CONF_SAMPLERATE:
 505                 devc->cur_samplerate = g_variant_get_uint64(data);
 506                 break;
 507         case SR_CONF_LIMIT_SAMPLES:
 508                 devc->limit_samples = g_variant_get_uint64(data);
 509                 break;
 510         case SR_CONF_VOLTAGE_THRESHOLD:
 511                 g_variant_get(data, "(dd)", &low, &high);
 512                 ret = SR_ERR_ARG;
 513                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 514                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 515                             fabs(volt_thresholds[i].high - high) < 0.1) {
 516                                 devc->selected_voltage_range =
 517                                         volt_thresholds[i].range;
 518                                 ret = SR_OK;
 519                                 break;
 520                         }
 521                 }
 522                 break;
 523         default:
 524                 ret = SR_ERR_NA;
 525         }
 526
 527         return ret;
 528 }
 529
 530 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 531                 const struct sr_channel_group *cg)
 532 {
 533         GVariant *gvar, *range[2];
 534         GVariantBuilder gvb;
 535         int ret;
 536         unsigned int i;
 537
 538         (void)sdi;
 539         (void)cg;
 540
 541         ret = SR_OK;
 542         switch (key) {
 543         case SR_CONF_SCAN_OPTIONS:
 544                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 545                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 546                 break;
 547         case SR_CONF_DEVICE_OPTIONS:
 548                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 549                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 550                 break;
 551         case SR_CONF_SAMPLERATE:
 552                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 553                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 554                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 555                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 556                 *data = g_variant_builder_end(&gvb);
 557                 break;
 558         case SR_CONF_VOLTAGE_THRESHOLD:
 559                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 560                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 561                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 562                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 563                         gvar = g_variant_new_tuple(range, 2);
 564                         g_variant_builder_add_value(&gvb, gvar);
 565                 }
 566                 *data = g_variant_builder_end(&gvb);
 567                 break;
 568         case SR_CONF_TRIGGER_MATCH:
 569                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 570                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 571                                 sizeof(int32_t));
 572                 break;
 573         default:
 574                 return SR_ERR_NA;
 575         }
 576
 577         return ret;
 578 }
 579
 580 static void abort_acquisition(struct dev_context *devc)
 581 {
 582         int i;
 583
 584         devc->sent_samples = -1;
 585
 586         for (i = devc->num_transfers - 1; i >= 0; i--) {
 587                 if (devc->transfers[i])
 588                         libusb_cancel_transfer(devc->transfers[i]);
 589         }
 590 }
 591
 592 static unsigned int bytes_per_ms(struct dev_context *devc)
 593 {
 594         return devc->cur_samplerate * devc->num_channels / 8000;
 595 }
 596
 597 static size_t get_buffer_size(struct dev_context *devc)
 598 {
 599         size_t s;
 600
 601         /*
 602          * The buffer should be large enough to hold 10ms of data and
 603          * a multiple of 512.
 604          */
 605         s = 10 * bytes_per_ms(devc);
 606         return (s + 511) & ~511;
 607 }
 608
 609 static unsigned int get_number_of_transfers(struct dev_context *devc)
 610 {
 611         unsigned int n;
 612
 613         /* Total buffer size should be able to hold about 500ms of data. */
 614         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 615
 616         if (n > NUM_SIMUL_TRANSFERS)
 617                 return NUM_SIMUL_TRANSFERS;
 618
 619         return n;
 620 }
 621
 622 static unsigned int get_timeout(struct dev_context *devc)
 623 {
 624         size_t total_size;
 625         unsigned int timeout;
 626
 627         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 628         timeout = total_size / bytes_per_ms(devc);
 629         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 630 }
 631
 632 static int configure_channels(const struct sr_dev_inst *sdi)
 633 {
 634         struct dev_context *devc;
 635         struct sr_channel *ch;
 636         GSList *l;
 637         uint16_t channel_bit;
 638
 639         devc = sdi->priv;
 640
 641         devc->cur_channels = 0;
 642         devc->num_channels = 0;
 643         for (l = sdi->channels; l; l = l->next) {
 644                 ch = (struct sr_channel *)l->data;
 645                 if (ch->enabled == FALSE)
 646                         continue;
 647
 648                 channel_bit = 1 << (ch->index);
 649
 650                 devc->cur_channels |= channel_bit;
 651
 652 #ifdef WORDS_BIGENDIAN
 653                 /*
 654                  * Output logic data should be stored in little endian format.
 655                  * To speed things up during conversion, do the switcharoo
 656                  * here instead.
 657                  */
 658                 channel_bit = 1 << (ch->index ^ 8);
 659 #endif
 660
 661                 devc->channel_masks[devc->num_channels++] = channel_bit;
 662         }
 663
 664         return SR_OK;
 665 }
 666
 667 static int receive_data(int fd, int revents, void *cb_data)
 668 {
 669         struct timeval tv;
 670         struct dev_context *devc;
 671         struct drv_context *drvc;
 672         const struct sr_dev_inst *sdi;
 673
 674         (void)fd;
 675         (void)revents;
 676
 677         sdi = cb_data;
 678         drvc = di->priv;
 679         devc = sdi->priv;
 680
 681         tv.tv_sec = tv.tv_usec = 0;
 682         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 683
 684         if (devc->sent_samples == -2) {
 685                 logic16_abort_acquisition(sdi);
 686                 abort_acquisition(devc);
 687         }
 688
 689         return TRUE;
 690 }
 691
 692 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 693 {
 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->priv;
 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                 devc->stl = soft_trigger_logic_new(sdi, trigger);
 725                 devc->trigger_fired = FALSE;
 726         } else
 727                 devc->trigger_fired = TRUE;
 728
 729         timeout = get_timeout(devc);
 730         num_transfers = get_number_of_transfers(devc);
 731         size = get_buffer_size(devc);
 732         convsize = (size / devc->num_channels + 2) * 16;
 733         devc->submitted_transfers = 0;
 734
 735         devc->convbuffer_size = convsize;
 736         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 737                 sr_err("Conversion buffer malloc failed.");
 738                 return SR_ERR_MALLOC;
 739         }
 740
 741         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 742         if (!devc->transfers) {
 743                 sr_err("USB transfers malloc failed.");
 744                 g_free(devc->convbuffer);
 745                 return SR_ERR_MALLOC;
 746         }
 747
 748         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 749                                              devc->cur_channels)) != SR_OK) {
 750                 g_free(devc->transfers);
 751                 g_free(devc->convbuffer);
 752                 return ret;
 753         }
 754
 755         devc->num_transfers = num_transfers;
 756         for (i = 0; i < num_transfers; i++) {
 757                 if (!(buf = g_try_malloc(size))) {
 758                         sr_err("USB transfer buffer malloc failed.");
 759                         if (devc->submitted_transfers)
 760                                 abort_acquisition(devc);
 761                         else {
 762                                 g_free(devc->transfers);
 763                                 g_free(devc->convbuffer);
 764                         }
 765                         return SR_ERR_MALLOC;
 766                 }
 767                 transfer = libusb_alloc_transfer(0);
 768                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 769                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 770                                 logic16_receive_transfer, (void *)sdi, timeout);
 771                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 772                         sr_err("Failed to submit transfer: %s.",
 773                                libusb_error_name(ret));
 774                         libusb_free_transfer(transfer);
 775                         g_free(buf);
 776                         abort_acquisition(devc);
 777                         return SR_ERR;
 778                 }
 779                 devc->transfers[i] = transfer;
 780                 devc->submitted_transfers++;
 781         }
 782
 783         devc->ctx = drvc->sr_ctx;
 784
 785         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 786
 787         /* Send header packet to the session bus. */
 788         std_session_send_df_header(cb_data, LOG_PREFIX);
 789
 790         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 791                 abort_acquisition(devc);
 792                 return ret;
 793         }
 794
 795         return SR_OK;
 796 }
 797
 798 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 799 {
 800         int ret;
 801
 802         (void)cb_data;
 803
 804         if (sdi->status != SR_ST_ACTIVE)
 805                 return SR_ERR_DEV_CLOSED;
 806
 807         ret = logic16_abort_acquisition(sdi);
 808
 809         abort_acquisition(sdi->priv);
 810
 811         return ret;
 812 }
 813
 814 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 815         .name = "saleae-logic16",
 816         .longname = "Saleae Logic16",
 817         .api_version = 1,
 818         .init = init,
 819         .cleanup = cleanup,
 820         .scan = scan,
 821         .dev_list = dev_list,
 822         .dev_clear = NULL,
 823         .config_get = config_get,
 824         .config_set = config_set,
 825         .config_list = config_list,
 826         .dev_open = dev_open,
 827         .dev_close = dev_close,
 828         .dev_acquisition_start = dev_acquisition_start,
 829         .dev_acquisition_stop = dev_acquisition_stop,
 830         .priv = NULL,
 831 };