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
  53         /* These are really implemented in the driver, not the hardware. */
  54         SR_CONF_LIMIT_SAMPLES,
  55         SR_CONF_CONTINUOUS,
  56 };
  57
  58 static const char *probe_names[] = {
  59         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  60         "9", "10", "11", "12", "13", "14", "15",
  61         NULL,
  62 };
  63
  64 static const struct {
  65         enum voltage_range range;
  66         gdouble low;
  67         gdouble high;
  68 } volt_thresholds[] = {
  69         { VOLTAGE_RANGE_18_33_V, 0.7, 1.4 },
  70         { VOLTAGE_RANGE_5_V,     1.4, 3.6 },
  71 };
  72
  73 static const uint64_t samplerates[] = {
  74         SR_KHZ(500),
  75         SR_MHZ(1),
  76         SR_MHZ(2),
  77         SR_MHZ(4),
  78         SR_MHZ(5),
  79         SR_MHZ(8),
  80         SR_MHZ(10),
  81         SR_KHZ(12500),
  82         SR_MHZ(16),
  83         SR_MHZ(25),
  84         SR_MHZ(32),
  85         SR_MHZ(40),
  86         SR_MHZ(80),
  87         SR_MHZ(100),
  88 };
  89
  90 static int init(struct sr_context *sr_ctx)
  91 {
  92         return std_init(sr_ctx, di, LOG_PREFIX);
  93 }
  94
  95 static gboolean check_conf_profile(libusb_device *dev)
  96 {
  97         struct libusb_device_descriptor des;
  98         struct libusb_device_handle *hdl;
  99         gboolean ret;
 100         unsigned char strdesc[64];
 101
 102         hdl = NULL;
 103         ret = FALSE;
 104         while (!ret) {
 105                 /* Assume the FW has not been loaded, unless proven wrong. */
 106                 if (libusb_get_device_descriptor(dev, &des) != 0)
 107                         break;
 108
 109                 if (libusb_open(dev, &hdl) != 0)
 110                         break;
 111
 112                 if (libusb_get_string_descriptor_ascii(hdl,
 113                     des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 114                         break;
 115                 if (strcmp((const char *)strdesc, "Saleae LLC"))
 116                         break;
 117
 118                 if (libusb_get_string_descriptor_ascii(hdl,
 119                     des.iProduct, strdesc, sizeof(strdesc)) < 0)
 120                         break;
 121                 if (strcmp((const char *)strdesc, "Logic S/16"))
 122                         break;
 123
 124                 /* If we made it here, it must be a configured Logic16. */
 125                 ret = TRUE;
 126         }
 127         if (hdl)
 128                 libusb_close(hdl);
 129
 130         return ret;
 131 }
 132
 133 static GSList *scan(GSList *options)
 134 {
 135         struct drv_context *drvc;
 136         struct dev_context *devc;
 137         struct sr_dev_inst *sdi;
 138         struct sr_usb_dev_inst *usb;
 139         struct sr_probe *probe;
 140         struct sr_config *src;
 141         GSList *l, *devices, *conn_devices;
 142         struct libusb_device_descriptor des;
 143         libusb_device **devlist;
 144         int devcnt, ret, i, j;
 145         const char *conn;
 146
 147         drvc = di->priv;
 148
 149         conn = NULL;
 150         for (l = options; l; l = l->next) {
 151                 src = l->data;
 152                 switch (src->key) {
 153                 case SR_CONF_CONN:
 154                         conn = g_variant_get_string(src->data, NULL);
 155                         break;
 156                 }
 157         }
 158         if (conn)
 159                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 160         else
 161                 conn_devices = NULL;
 162
 163         /* Find all Logic16 devices and upload firmware to them. */
 164         devices = NULL;
 165         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 166         for (i = 0; devlist[i]; i++) {
 167                 if (conn) {
 168                         usb = NULL;
 169                         for (l = conn_devices; l; l = l->next) {
 170                                 usb = l->data;
 171                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 172                                     && usb->address == libusb_get_device_address(devlist[i]))
 173                                         break;
 174                         }
 175                         if (!l)
 176                                 /* This device matched none of the ones that
 177                                  * matched the conn specification. */
 178                                 continue;
 179                 }
 180
 181                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 182                         sr_warn("Failed to get device descriptor: %s.",
 183                                 libusb_error_name(ret));
 184                         continue;
 185                 }
 186
 187                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 188                         continue;
 189
 190                 devcnt = g_slist_length(drvc->instances);
 191                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 192                                       "Saleae", "Logic16", NULL);
 193                 if (!sdi)
 194                         return NULL;
 195                 sdi->driver = di;
 196
 197                 for (j = 0; probe_names[j]; j++) {
 198                         if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 199                                                    probe_names[j])))
 200                                 return NULL;
 201                         sdi->probes = g_slist_append(sdi->probes, probe);
 202                 }
 203
 204                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 205                         return NULL;
 206                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 207                 sdi->priv = devc;
 208                 drvc->instances = g_slist_append(drvc->instances, sdi);
 209                 devices = g_slist_append(devices, sdi);
 210
 211                 if (check_conf_profile(devlist[i])) {
 212                         /* Already has the firmware, so fix the new address. */
 213                         sr_dbg("Found a Logic16 device.");
 214                         sdi->status = SR_ST_INACTIVE;
 215                         sdi->inst_type = SR_INST_USB;
 216                         sdi->conn = sr_usb_dev_inst_new(
 217                                 libusb_get_bus_number(devlist[i]),
 218                                 libusb_get_device_address(devlist[i]), NULL);
 219                 } else {
 220                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 221                                                   FX2_FIRMWARE) == SR_OK)
 222                                 /* Store when this device's FW was updated. */
 223                                 devc->fw_updated = g_get_monotonic_time();
 224                         else
 225                                 sr_err("Firmware upload failed for "
 226                                        "device %d.", devcnt);
 227                         sdi->inst_type = SR_INST_USB;
 228                         sdi->conn = sr_usb_dev_inst_new(
 229                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 230                 }
 231         }
 232         libusb_free_device_list(devlist, 1);
 233         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 234
 235         return devices;
 236 }
 237
 238 static GSList *dev_list(void)
 239 {
 240         return ((struct drv_context *)(di->priv))->instances;
 241 }
 242
 243 static int dev_clear(void)
 244 {
 245         return std_dev_clear(di, NULL);
 246 }
 247
 248 static int logic16_dev_open(struct sr_dev_inst *sdi)
 249 {
 250         libusb_device **devlist;
 251         struct sr_usb_dev_inst *usb;
 252         struct libusb_device_descriptor des;
 253         struct drv_context *drvc;
 254         int ret, skip, i, device_count;
 255
 256         drvc = di->priv;
 257         usb = sdi->conn;
 258
 259         if (sdi->status == SR_ST_ACTIVE)
 260                 /* Device is already in use. */
 261                 return SR_ERR;
 262
 263         skip = 0;
 264         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 265         if (device_count < 0) {
 266                 sr_err("Failed to get device list: %s.",
 267                        libusb_error_name(device_count));
 268                 return SR_ERR;
 269         }
 270
 271         for (i = 0; i < device_count; i++) {
 272                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 273                         sr_err("Failed to get device descriptor: %s.",
 274                                libusb_error_name(ret));
 275                         continue;
 276                 }
 277
 278                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 279                         continue;
 280
 281                 if (sdi->status == SR_ST_INITIALIZING) {
 282                         if (skip != sdi->index) {
 283                                 /* Skip devices of this type that aren't the one we want. */
 284                                 skip += 1;
 285                                 continue;
 286                         }
 287                 } else if (sdi->status == SR_ST_INACTIVE) {
 288                         /*
 289                          * This device is fully enumerated, so we need to find
 290                          * this device by vendor, product, bus and address.
 291                          */
 292                         if (libusb_get_bus_number(devlist[i]) != usb->bus
 293                             || libusb_get_device_address(devlist[i]) != usb->address)
 294                                 /* This is not the one. */
 295                                 continue;
 296                 }
 297
 298                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 299                         if (usb->address == 0xff)
 300                                 /*
 301                                  * First time we touch this device after FW
 302                                  * upload, so we don't know the address yet.
 303                                  */
 304                                 usb->address = libusb_get_device_address(devlist[i]);
 305                 } else {
 306                         sr_err("Failed to open device: %s.",
 307                                libusb_error_name(ret));
 308                         break;
 309                 }
 310
 311                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 312                 if (ret == LIBUSB_ERROR_BUSY) {
 313                         sr_err("Unable to claim USB interface. Another "
 314                                "program or driver has already claimed it.");
 315                         break;
 316                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 317                         sr_err("Device has been disconnected.");
 318                         break;
 319                 } else if (ret != 0) {
 320                         sr_err("Unable to claim interface: %s.",
 321                                libusb_error_name(ret));
 322                         break;
 323                 }
 324
 325                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 326                         sr_err("Failed to init device.");
 327                         break;
 328                 }
 329
 330                 sdi->status = SR_ST_ACTIVE;
 331                 sr_info("Opened device %d on %d.%d, interface %d.",
 332                         sdi->index, usb->bus, usb->address, USB_INTERFACE);
 333
 334                 break;
 335         }
 336         libusb_free_device_list(devlist, 1);
 337
 338         if (sdi->status != SR_ST_ACTIVE) {
 339                 if (usb->devhdl) {
 340                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 341                         libusb_close(usb->devhdl);
 342                         usb->devhdl = NULL;
 343                 }
 344                 return SR_ERR;
 345         }
 346
 347         return SR_OK;
 348 }
 349
 350 static int dev_open(struct sr_dev_inst *sdi)
 351 {
 352         struct dev_context *devc;
 353         int ret;
 354         int64_t timediff_us, timediff_ms;
 355
 356         devc = sdi->priv;
 357
 358         /*
 359          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 360          * milliseconds for the FX2 to renumerate.
 361          */
 362         ret = SR_ERR;
 363         if (devc->fw_updated > 0) {
 364                 sr_info("Waiting for device to reset.");
 365                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 366                 g_usleep(300 * 1000);
 367                 timediff_ms = 0;
 368                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 369                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 370                                 break;
 371                         g_usleep(100 * 1000);
 372
 373                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 374                         timediff_ms = timediff_us / 1000;
 375                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 376                 }
 377                 if (ret != SR_OK) {
 378                         sr_err("Device failed to renumerate.");
 379                         return SR_ERR;
 380                 }
 381                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 382         } else {
 383                 sr_info("Firmware upload was not needed.");
 384                 ret = logic16_dev_open(sdi);
 385         }
 386
 387         if (ret != SR_OK) {
 388                 sr_err("Unable to open device.");
 389                 return SR_ERR;
 390         }
 391
 392         if (devc->cur_samplerate == 0) {
 393                 /* Samplerate hasn't been set; default to the slowest one. */
 394                 devc->cur_samplerate = samplerates[0];
 395         }
 396
 397         return SR_OK;
 398 }
 399
 400 static int dev_close(struct sr_dev_inst *sdi)
 401 {
 402         struct sr_usb_dev_inst *usb;
 403
 404         usb = sdi->conn;
 405         if (usb->devhdl == NULL)
 406                 return SR_ERR;
 407
 408         sr_info("Closing device %d on %d.%d interface %d.",
 409                 sdi->index, usb->bus, usb->address, USB_INTERFACE);
 410         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 411         libusb_close(usb->devhdl);
 412         usb->devhdl = NULL;
 413         sdi->status = SR_ST_INACTIVE;
 414
 415         return SR_OK;
 416 }
 417
 418 static int cleanup(void)
 419 {
 420         int ret;
 421         struct drv_context *drvc;
 422
 423         if (!(drvc = di->priv))
 424                 /* Can get called on an unused driver, doesn't matter. */
 425                 return SR_OK;
 426
 427         ret = dev_clear();
 428         g_free(drvc);
 429         di->priv = NULL;
 430
 431         return ret;
 432 }
 433
 434 static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
 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         ret = SR_OK;
 444         switch (key) {
 445         case SR_CONF_CONN:
 446                 if (!sdi || !sdi->conn)
 447                         return SR_ERR_ARG;
 448                 usb = sdi->conn;
 449                 if (usb->address == 255)
 450                         /* Device still needs to re-enumerate after firmware
 451                          * upload, so we don't know its (future) address. */
 452                         return SR_ERR;
 453                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 454                 *data = g_variant_new_string(str);
 455                 break;
 456         case SR_CONF_SAMPLERATE:
 457                 if (!sdi)
 458                         return SR_ERR;
 459                 devc = sdi->priv;
 460                 *data = g_variant_new_uint64(devc->cur_samplerate);
 461                 break;
 462         case SR_CONF_VOLTAGE_THRESHOLD:
 463                 if (!sdi)
 464                         return SR_ERR;
 465                 devc = sdi->priv;
 466                 ret = SR_ERR;
 467                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 468                         if (devc->selected_voltage_range !=
 469                             volt_thresholds[i].range)
 470                                 continue;
 471                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 472                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 473                         *data = g_variant_new_tuple(range, 2);
 474                         ret = SR_OK;
 475                         break;
 476                 }
 477                 break;
 478         default:
 479                 return SR_ERR_NA;
 480         }
 481
 482         return ret;
 483 }
 484
 485 static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
 486 {
 487         struct dev_context *devc;
 488         gdouble low, high;
 489         int ret;
 490         unsigned int i;
 491
 492         if (sdi->status != SR_ST_ACTIVE)
 493                 return SR_ERR_DEV_CLOSED;
 494
 495         devc = sdi->priv;
 496
 497         ret = SR_OK;
 498         switch (key) {
 499         case SR_CONF_SAMPLERATE:
 500                 devc->cur_samplerate = g_variant_get_uint64(data);
 501                 break;
 502         case SR_CONF_LIMIT_SAMPLES:
 503                 devc->limit_samples = g_variant_get_uint64(data);
 504                 break;
 505         case SR_CONF_VOLTAGE_THRESHOLD:
 506                 g_variant_get(data, "(dd)", &low, &high);
 507                 ret = SR_ERR_ARG;
 508                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 509                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 510                             fabs(volt_thresholds[i].high - high) < 0.1) {
 511                                 devc->selected_voltage_range =
 512                                         volt_thresholds[i].range;
 513                                 ret = SR_OK;
 514                                 break;
 515                         }
 516                 }
 517                 break;
 518         default:
 519                 ret = SR_ERR_NA;
 520         }
 521
 522         return ret;
 523 }
 524
 525 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 526 {
 527         GVariant *gvar, *range[2];
 528         GVariantBuilder gvb;
 529         int ret;
 530         unsigned int i;
 531
 532         (void)sdi;
 533
 534         ret = SR_OK;
 535         switch (key) {
 536         case SR_CONF_SCAN_OPTIONS:
 537                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 538                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 539                 break;
 540         case SR_CONF_DEVICE_OPTIONS:
 541                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 542                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 543                 break;
 544         case SR_CONF_SAMPLERATE:
 545                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 546                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 547                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 548                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 549                 *data = g_variant_builder_end(&gvb);
 550                 break;
 551         case SR_CONF_VOLTAGE_THRESHOLD:
 552                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 553                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 554                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 555                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 556                         gvar = g_variant_new_tuple(range, 2);
 557                         g_variant_builder_add_value(&gvb, gvar);
 558                 }
 559                 *data = g_variant_builder_end(&gvb);
 560                 break;
 561         default:
 562                 return SR_ERR_NA;
 563         }
 564
 565         return ret;
 566 }
 567
 568 static void abort_acquisition(struct dev_context *devc)
 569 {
 570         int i;
 571
 572         devc->num_samples = -1;
 573
 574         for (i = devc->num_transfers - 1; i >= 0; i--) {
 575                 if (devc->transfers[i])
 576                         libusb_cancel_transfer(devc->transfers[i]);
 577         }
 578 }
 579
 580 static unsigned int bytes_per_ms(struct dev_context *devc)
 581 {
 582         return devc->cur_samplerate * devc->num_channels / 8000;
 583 }
 584
 585 static size_t get_buffer_size(struct dev_context *devc)
 586 {
 587         size_t s;
 588
 589         /*
 590          * The buffer should be large enough to hold 10ms of data and
 591          * a multiple of 512.
 592          */
 593         s = 10 * bytes_per_ms(devc);
 594         return (s + 511) & ~511;
 595 }
 596
 597 static unsigned int get_number_of_transfers(struct dev_context *devc)
 598 {
 599         unsigned int n;
 600
 601         /* Total buffer size should be able to hold about 500ms of data. */
 602         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 603
 604         if (n > NUM_SIMUL_TRANSFERS)
 605                 return NUM_SIMUL_TRANSFERS;
 606
 607         return n;
 608 }
 609
 610 static unsigned int get_timeout(struct dev_context *devc)
 611 {
 612         size_t total_size;
 613         unsigned int timeout;
 614
 615         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 616         timeout = total_size / bytes_per_ms(devc);
 617         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 618 }
 619
 620 static int configure_probes(const struct sr_dev_inst *sdi)
 621 {
 622         struct dev_context *devc;
 623         struct sr_probe *probe;
 624         GSList *l;
 625         uint16_t probe_bit;
 626
 627         devc = sdi->priv;
 628
 629         devc->cur_channels = 0;
 630         devc->num_channels = 0;
 631         for (l = sdi->probes; l; l = l->next) {
 632                 probe = (struct sr_probe *)l->data;
 633                 if (probe->enabled == FALSE)
 634                         continue;
 635
 636                 probe_bit = 1 << (probe->index);
 637
 638                 devc->cur_channels |= probe_bit;
 639
 640 #ifdef WORDS_BIGENDIAN
 641                 /*
 642                  * Output logic data should be stored in little endian format.
 643                  * To speed things up during conversion, do the switcharoo
 644                  * here instead.
 645                  */
 646                 probe_bit = 1 << (probe->index ^ 8);
 647 #endif
 648
 649                 devc->channel_masks[devc->num_channels++] = probe_bit;
 650         }
 651
 652         return SR_OK;
 653 }
 654
 655 static int receive_data(int fd, int revents, void *cb_data)
 656 {
 657         struct timeval tv;
 658         struct dev_context *devc;
 659         struct drv_context *drvc;
 660         const struct sr_dev_inst *sdi;
 661
 662         (void)fd;
 663         (void)revents;
 664
 665         sdi = cb_data;
 666         drvc = di->priv;
 667         devc = sdi->priv;
 668
 669         tv.tv_sec = tv.tv_usec = 0;
 670         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 671
 672         if (devc->num_samples == -2) {
 673                 logic16_abort_acquisition(sdi);
 674                 abort_acquisition(devc);
 675         }
 676
 677         return TRUE;
 678 }
 679
 680 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 681 {
 682         struct dev_context *devc;
 683         struct drv_context *drvc;
 684         struct sr_usb_dev_inst *usb;
 685         struct libusb_transfer *transfer;
 686         const struct libusb_pollfd **lupfd;
 687         unsigned int i, timeout, num_transfers;
 688         int ret;
 689         unsigned char *buf;
 690         size_t size, convsize;
 691
 692         if (sdi->status != SR_ST_ACTIVE)
 693                 return SR_ERR_DEV_CLOSED;
 694
 695         drvc = di->priv;
 696         devc = sdi->priv;
 697         usb = sdi->conn;
 698
 699         /* Configures devc->cur_channels. */
 700         if (configure_probes(sdi) != SR_OK) {
 701                 sr_err("Failed to configure probes.");
 702                 return SR_ERR;
 703         }
 704
 705         devc->cb_data = cb_data;
 706         devc->num_samples = 0;
 707         devc->empty_transfer_count = 0;
 708         devc->cur_channel = 0;
 709         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 710
 711         timeout = get_timeout(devc);
 712         num_transfers = get_number_of_transfers(devc);
 713         size = get_buffer_size(devc);
 714         convsize = (size / devc->num_channels + 2) * 16;
 715         devc->submitted_transfers = 0;
 716         devc->usbfd = NULL;
 717
 718         devc->convbuffer_size = convsize;
 719         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 720                 sr_err("Conversion buffer malloc failed.");
 721                 return SR_ERR_MALLOC;
 722         }
 723
 724         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 725         if (!devc->transfers) {
 726                 sr_err("USB transfers malloc failed.");
 727                 g_free(devc->convbuffer);
 728                 return SR_ERR_MALLOC;
 729         }
 730
 731         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 732                                              devc->cur_channels)) != SR_OK) {
 733                 g_free(devc->transfers);
 734                 g_free(devc->convbuffer);
 735                 return ret;
 736         }
 737
 738         devc->num_transfers = num_transfers;
 739         for (i = 0; i < num_transfers; i++) {
 740                 if (!(buf = g_try_malloc(size))) {
 741                         sr_err("USB transfer buffer malloc failed.");
 742                         if (devc->submitted_transfers)
 743                                 abort_acquisition(devc);
 744                         else {
 745                                 g_free(devc->transfers);
 746                                 g_free(devc->convbuffer);
 747                         }
 748                         return SR_ERR_MALLOC;
 749                 }
 750                 transfer = libusb_alloc_transfer(0);
 751                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 752                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 753                                 logic16_receive_transfer, devc, timeout);
 754                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 755                         sr_err("Failed to submit transfer: %s.",
 756                                libusb_error_name(ret));
 757                         libusb_free_transfer(transfer);
 758                         g_free(buf);
 759                         abort_acquisition(devc);
 760                         return SR_ERR;
 761                 }
 762                 devc->transfers[i] = transfer;
 763                 devc->submitted_transfers++;
 764         }
 765
 766         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 767         for (i = 0; lupfd[i]; i++);
 768         devc->usbfd = g_try_malloc(sizeof(struct libusb_pollfd) * (i + 1));
 769         if (!devc->usbfd) {
 770                 abort_acquisition(devc);
 771                 free(lupfd);
 772                 return SR_ERR;
 773         }
 774         for (i = 0; lupfd[i]; i++) {
 775                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 776                               timeout, receive_data, (void *)sdi);
 777                 devc->usbfd[i] = lupfd[i]->fd;
 778         }
 779         devc->usbfd[i] = -1;
 780         free(lupfd);
 781
 782         /* Send header packet to the session bus. */
 783         std_session_send_df_header(cb_data, LOG_PREFIX);
 784
 785         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 786                 abort_acquisition(devc);
 787                 return ret;
 788         }
 789
 790         return SR_OK;
 791 }
 792
 793 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 794 {
 795         int ret;
 796
 797         (void)cb_data;
 798
 799         if (sdi->status != SR_ST_ACTIVE)
 800                 return SR_ERR_DEV_CLOSED;
 801
 802         ret = logic16_abort_acquisition(sdi);
 803
 804         abort_acquisition(sdi->priv);
 805
 806         return ret;
 807 }
 808
 809 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 810         .name = "saleae-logic16",
 811         .longname = "Saleae Logic16",
 812         .api_version = 1,
 813         .init = init,
 814         .cleanup = cleanup,
 815         .scan = scan,
 816         .dev_list = dev_list,
 817         .dev_clear = dev_clear,
 818         .config_get = config_get,
 819         .config_set = config_set,
 820         .config_list = config_list,
 821         .dev_open = dev_open,
 822         .dev_close = dev_close,
 823         .dev_acquisition_start = dev_acquisition_start,
 824         .dev_acquisition_stop = dev_acquisition_stop,
 825         .priv = NULL,
 826 };