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_channel *ch;
 149         struct sr_config *src;
 150         GSList *l, *devices, *conn_devices;
 151         struct libusb_device_descriptor des;
 152         libusb_device **devlist;
 153         int ret, i, j;
 154         const char *conn;
 155         char connection_id[64];
 156
 157         drvc = di->priv;
 158
 159         conn = NULL;
 160         for (l = options; l; l = l->next) {
 161                 src = l->data;
 162                 switch (src->key) {
 163                 case SR_CONF_CONN:
 164                         conn = g_variant_get_string(src->data, NULL);
 165                         break;
 166                 }
 167         }
 168         if (conn)
 169                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 170         else
 171                 conn_devices = NULL;
 172
 173         /* Find all Logic16 devices and upload firmware to them. */
 174         devices = NULL;
 175         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 176         for (i = 0; devlist[i]; i++) {
 177                 if (conn) {
 178                         usb = NULL;
 179                         for (l = conn_devices; l; l = l->next) {
 180                                 usb = l->data;
 181                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 182                                     && usb->address == libusb_get_device_address(devlist[i]))
 183                                         break;
 184                         }
 185                         if (!l)
 186                                 /* This device matched none of the ones that
 187                                  * matched the conn specification. */
 188                                 continue;
 189                 }
 190
 191                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 192                         sr_warn("Failed to get device descriptor: %s.",
 193                                 libusb_error_name(ret));
 194                         continue;
 195                 }
 196
 197                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 198
 199                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 200                         continue;
 201
 202                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 203                 sdi->status = SR_ST_INITIALIZING;
 204                 sdi->vendor = g_strdup("Saleae");
 205                 sdi->model = g_strdup("Logic16");
 206                 sdi->driver = di;
 207                 sdi->connection_id = g_strdup(connection_id);
 208
 209                 for (j = 0; channel_names[j]; j++) {
 210                         ch = sr_channel_new(j, SR_CHANNEL_LOGIC, TRUE,
 211                                             channel_names[j]);
 212                         sdi->channels = g_slist_append(sdi->channels, ch);
 213                 }
 214
 215                 devc = g_malloc0(sizeof(struct dev_context));
 216                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 217                 sdi->priv = devc;
 218                 drvc->instances = g_slist_append(drvc->instances, sdi);
 219                 devices = g_slist_append(devices, sdi);
 220
 221                 if (check_conf_profile(devlist[i])) {
 222                         /* Already has the firmware, so fix the new address. */
 223                         sr_dbg("Found a Logic16 device.");
 224                         sdi->status = SR_ST_INACTIVE;
 225                         sdi->inst_type = SR_INST_USB;
 226                         sdi->conn = sr_usb_dev_inst_new(
 227                                 libusb_get_bus_number(devlist[i]),
 228                                 libusb_get_device_address(devlist[i]), NULL);
 229                 } else {
 230                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 231                                                   FX2_FIRMWARE) == SR_OK)
 232                                 /* Store when this device's FW was updated. */
 233                                 devc->fw_updated = g_get_monotonic_time();
 234                         else
 235                                 sr_err("Firmware upload failed.");
 236                         sdi->inst_type = SR_INST_USB;
 237                         sdi->conn = sr_usb_dev_inst_new(
 238                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 239                 }
 240         }
 241         libusb_free_device_list(devlist, 1);
 242         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 243
 244         return devices;
 245 }
 246
 247 static GSList *dev_list(void)
 248 {
 249         return ((struct drv_context *)(di->priv))->instances;
 250 }
 251
 252 static int logic16_dev_open(struct sr_dev_inst *sdi)
 253 {
 254         libusb_device **devlist;
 255         struct sr_usb_dev_inst *usb;
 256         struct libusb_device_descriptor des;
 257         struct drv_context *drvc;
 258         int ret, i, device_count;
 259         char connection_id[64];
 260
 261         drvc = di->priv;
 262         usb = sdi->conn;
 263
 264         if (sdi->status == SR_ST_ACTIVE)
 265                 /* Device is already in use. */
 266                 return SR_ERR;
 267
 268         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 269         if (device_count < 0) {
 270                 sr_err("Failed to get device list: %s.",
 271                        libusb_error_name(device_count));
 272                 return SR_ERR;
 273         }
 274
 275         for (i = 0; i < device_count; i++) {
 276                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 277                         sr_err("Failed to get device descriptor: %s.",
 278                                libusb_error_name(ret));
 279                         continue;
 280                 }
 281
 282                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 283                         continue;
 284
 285                 if ((sdi->status == SR_ST_INITIALIZING) ||
 286                                 (sdi->status == SR_ST_INACTIVE)) {
 287                         /*
 288                          * Check device by its physical USB bus/port address.
 289                          */
 290                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 291                         if (strcmp(sdi->connection_id, connection_id))
 292                                 /* This is not the one. */
 293                                 continue;
 294                 }
 295
 296                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 297                         if (usb->address == 0xff)
 298                                 /*
 299                                  * First time we touch this device after FW
 300                                  * upload, so we don't know the address yet.
 301                                  */
 302                                 usb->address = libusb_get_device_address(devlist[i]);
 303                 } else {
 304                         sr_err("Failed to open device: %s.",
 305                                libusb_error_name(ret));
 306                         break;
 307                 }
 308
 309                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 310                 if (ret == LIBUSB_ERROR_BUSY) {
 311                         sr_err("Unable to claim USB interface. Another "
 312                                "program or driver has already claimed it.");
 313                         break;
 314                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 315                         sr_err("Device has been disconnected.");
 316                         break;
 317                 } else if (ret != 0) {
 318                         sr_err("Unable to claim interface: %s.",
 319                                libusb_error_name(ret));
 320                         break;
 321                 }
 322
 323                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 324                         sr_err("Failed to init device.");
 325                         break;
 326                 }
 327
 328                 sdi->status = SR_ST_ACTIVE;
 329                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 330                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 331
 332                 break;
 333         }
 334         libusb_free_device_list(devlist, 1);
 335
 336         if (sdi->status != SR_ST_ACTIVE) {
 337                 if (usb->devhdl) {
 338                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 339                         libusb_close(usb->devhdl);
 340                         usb->devhdl = NULL;
 341                 }
 342                 return SR_ERR;
 343         }
 344
 345         return SR_OK;
 346 }
 347
 348 static int dev_open(struct sr_dev_inst *sdi)
 349 {
 350         struct dev_context *devc;
 351         int ret;
 352         int64_t timediff_us, timediff_ms;
 353
 354         devc = sdi->priv;
 355
 356         /*
 357          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 358          * milliseconds for the FX2 to renumerate.
 359          */
 360         ret = SR_ERR;
 361         if (devc->fw_updated > 0) {
 362                 sr_info("Waiting for device to reset.");
 363                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 364                 g_usleep(300 * 1000);
 365                 timediff_ms = 0;
 366                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 367                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 368                                 break;
 369                         g_usleep(100 * 1000);
 370
 371                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 372                         timediff_ms = timediff_us / 1000;
 373                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 374                 }
 375                 if (ret != SR_OK) {
 376                         sr_err("Device failed to renumerate.");
 377                         return SR_ERR;
 378                 }
 379                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 380         } else {
 381                 sr_info("Firmware upload was not needed.");
 382                 ret = logic16_dev_open(sdi);
 383         }
 384
 385         if (ret != SR_OK) {
 386                 sr_err("Unable to open device.");
 387                 return SR_ERR;
 388         }
 389
 390         if (devc->cur_samplerate == 0) {
 391                 /* Samplerate hasn't been set; default to the slowest one. */
 392                 devc->cur_samplerate = samplerates[0];
 393         }
 394
 395         return SR_OK;
 396 }
 397
 398 static int dev_close(struct sr_dev_inst *sdi)
 399 {
 400         struct sr_usb_dev_inst *usb;
 401
 402         usb = sdi->conn;
 403         if (usb->devhdl == NULL)
 404                 return SR_ERR;
 405
 406         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 407                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 408         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 409         libusb_close(usb->devhdl);
 410         usb->devhdl = NULL;
 411         sdi->status = SR_ST_INACTIVE;
 412
 413         return SR_OK;
 414 }
 415
 416 static int cleanup(void)
 417 {
 418         int ret;
 419         struct drv_context *drvc;
 420
 421         if (!(drvc = di->priv))
 422                 /* Can get called on an unused driver, doesn't matter. */
 423                 return SR_OK;
 424
 425         ret = std_dev_clear(di, NULL);
 426         g_free(drvc);
 427         di->priv = NULL;
 428
 429         return ret;
 430 }
 431
 432 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 433                 const struct sr_channel_group *cg)
 434 {
 435         struct dev_context *devc;
 436         struct sr_usb_dev_inst *usb;
 437         GVariant *range[2];
 438         char str[128];
 439         int ret;
 440         unsigned int i;
 441
 442         (void)cg;
 443
 444         ret = SR_OK;
 445         switch (key) {
 446         case SR_CONF_CONN:
 447                 if (!sdi || !sdi->conn)
 448                         return SR_ERR_ARG;
 449                 usb = sdi->conn;
 450                 if (usb->address == 255)
 451                         /* Device still needs to re-enumerate after firmware
 452                          * upload, so we don't know its (future) address. */
 453                         return SR_ERR;
 454                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 455                 *data = g_variant_new_string(str);
 456                 break;
 457         case SR_CONF_SAMPLERATE:
 458                 if (!sdi)
 459                         return SR_ERR;
 460                 devc = sdi->priv;
 461                 *data = g_variant_new_uint64(devc->cur_samplerate);
 462                 break;
 463         case SR_CONF_CAPTURE_RATIO:
 464                 if (!sdi)
 465                         return SR_ERR;
 466                 devc = sdi->priv;
 467                 *data = g_variant_new_uint64(devc->capture_ratio);
 468                 break;
 469         case SR_CONF_VOLTAGE_THRESHOLD:
 470                 if (!sdi)
 471                         return SR_ERR;
 472                 devc = sdi->priv;
 473                 ret = SR_ERR;
 474                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 475                         if (devc->selected_voltage_range !=
 476                             volt_thresholds[i].range)
 477                                 continue;
 478                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 479                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 480                         *data = g_variant_new_tuple(range, 2);
 481                         ret = SR_OK;
 482                         break;
 483                 }
 484                 break;
 485         default:
 486                 return SR_ERR_NA;
 487         }
 488
 489         return ret;
 490 }
 491
 492 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 493                 const struct sr_channel_group *cg)
 494 {
 495         struct dev_context *devc;
 496         gdouble low, high;
 497         int ret;
 498         unsigned int i;
 499
 500         (void)cg;
 501
 502         if (sdi->status != SR_ST_ACTIVE)
 503                 return SR_ERR_DEV_CLOSED;
 504
 505         devc = sdi->priv;
 506
 507         ret = SR_OK;
 508         switch (key) {
 509         case SR_CONF_SAMPLERATE:
 510                 devc->cur_samplerate = g_variant_get_uint64(data);
 511                 break;
 512         case SR_CONF_LIMIT_SAMPLES:
 513                 devc->limit_samples = g_variant_get_uint64(data);
 514                 break;
 515         case SR_CONF_CAPTURE_RATIO:
 516                 devc->capture_ratio = g_variant_get_uint64(data);
 517                 if (devc->capture_ratio > 100) {
 518                         devc->capture_ratio = 0;
 519                         ret = SR_ERR;
 520                 } else
 521                         ret = SR_OK;
 522                 break;
 523         case SR_CONF_VOLTAGE_THRESHOLD:
 524                 g_variant_get(data, "(dd)", &low, &high);
 525                 ret = SR_ERR_ARG;
 526                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 527                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 528                             fabs(volt_thresholds[i].high - high) < 0.1) {
 529                                 devc->selected_voltage_range =
 530                                         volt_thresholds[i].range;
 531                                 ret = SR_OK;
 532                                 break;
 533                         }
 534                 }
 535                 break;
 536         default:
 537                 ret = SR_ERR_NA;
 538         }
 539
 540         return ret;
 541 }
 542
 543 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 544                 const struct sr_channel_group *cg)
 545 {
 546         GVariant *gvar, *range[2];
 547         GVariantBuilder gvb;
 548         int ret;
 549         unsigned int i;
 550
 551         (void)sdi;
 552         (void)cg;
 553
 554         ret = SR_OK;
 555         switch (key) {
 556         case SR_CONF_SCAN_OPTIONS:
 557                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 558                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 559                 break;
 560         case SR_CONF_DEVICE_OPTIONS:
 561                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 562                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 563                 break;
 564         case SR_CONF_SAMPLERATE:
 565                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 566                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 567                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 568                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 569                 *data = g_variant_builder_end(&gvb);
 570                 break;
 571         case SR_CONF_VOLTAGE_THRESHOLD:
 572                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 573                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 574                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 575                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 576                         gvar = g_variant_new_tuple(range, 2);
 577                         g_variant_builder_add_value(&gvb, gvar);
 578                 }
 579                 *data = g_variant_builder_end(&gvb);
 580                 break;
 581         case SR_CONF_TRIGGER_MATCH:
 582                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 583                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 584                                 sizeof(int32_t));
 585                 break;
 586         default:
 587                 return SR_ERR_NA;
 588         }
 589
 590         return ret;
 591 }
 592
 593 static void abort_acquisition(struct dev_context *devc)
 594 {
 595         int i;
 596
 597         devc->sent_samples = -1;
 598
 599         for (i = devc->num_transfers - 1; i >= 0; i--) {
 600                 if (devc->transfers[i])
 601                         libusb_cancel_transfer(devc->transfers[i]);
 602         }
 603 }
 604
 605 static unsigned int bytes_per_ms(struct dev_context *devc)
 606 {
 607         return devc->cur_samplerate * devc->num_channels / 8000;
 608 }
 609
 610 static size_t get_buffer_size(struct dev_context *devc)
 611 {
 612         size_t s;
 613
 614         /*
 615          * The buffer should be large enough to hold 10ms of data and
 616          * a multiple of 512.
 617          */
 618         s = 10 * bytes_per_ms(devc);
 619         return (s + 511) & ~511;
 620 }
 621
 622 static unsigned int get_number_of_transfers(struct dev_context *devc)
 623 {
 624         unsigned int n;
 625
 626         /* Total buffer size should be able to hold about 500ms of data. */
 627         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 628
 629         if (n > NUM_SIMUL_TRANSFERS)
 630                 return NUM_SIMUL_TRANSFERS;
 631
 632         return n;
 633 }
 634
 635 static unsigned int get_timeout(struct dev_context *devc)
 636 {
 637         size_t total_size;
 638         unsigned int timeout;
 639
 640         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 641         timeout = total_size / bytes_per_ms(devc);
 642         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 643 }
 644
 645 static int configure_channels(const struct sr_dev_inst *sdi)
 646 {
 647         struct dev_context *devc;
 648         struct sr_channel *ch;
 649         GSList *l;
 650         uint16_t channel_bit;
 651
 652         devc = sdi->priv;
 653
 654         devc->cur_channels = 0;
 655         devc->num_channels = 0;
 656         for (l = sdi->channels; l; l = l->next) {
 657                 ch = (struct sr_channel *)l->data;
 658                 if (ch->enabled == FALSE)
 659                         continue;
 660
 661                 channel_bit = 1 << (ch->index);
 662
 663                 devc->cur_channels |= channel_bit;
 664
 665 #ifdef WORDS_BIGENDIAN
 666                 /*
 667                  * Output logic data should be stored in little endian format.
 668                  * To speed things up during conversion, do the switcharoo
 669                  * here instead.
 670                  */
 671                 channel_bit = 1 << (ch->index ^ 8);
 672 #endif
 673
 674                 devc->channel_masks[devc->num_channels++] = channel_bit;
 675         }
 676
 677         return SR_OK;
 678 }
 679
 680 static int receive_data(int fd, int revents, void *cb_data)
 681 {
 682         struct timeval tv;
 683         struct dev_context *devc;
 684         struct drv_context *drvc;
 685         const struct sr_dev_inst *sdi;
 686
 687         (void)fd;
 688         (void)revents;
 689
 690         sdi = cb_data;
 691         drvc = di->priv;
 692         devc = sdi->priv;
 693
 694         tv.tv_sec = tv.tv_usec = 0;
 695         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 696
 697         if (devc->sent_samples == -2) {
 698                 logic16_abort_acquisition(sdi);
 699                 abort_acquisition(devc);
 700         }
 701
 702         return TRUE;
 703 }
 704
 705 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 706 {
 707         struct dev_context *devc;
 708         struct drv_context *drvc;
 709         struct sr_usb_dev_inst *usb;
 710         struct sr_trigger *trigger;
 711         struct libusb_transfer *transfer;
 712         unsigned int i, timeout, num_transfers;
 713         int ret;
 714         unsigned char *buf;
 715         size_t size, convsize;
 716
 717         if (sdi->status != SR_ST_ACTIVE)
 718                 return SR_ERR_DEV_CLOSED;
 719
 720         drvc = di->priv;
 721         devc = sdi->priv;
 722         usb = sdi->conn;
 723
 724         /* Configures devc->cur_channels. */
 725         if (configure_channels(sdi) != SR_OK) {
 726                 sr_err("Failed to configure channels.");
 727                 return SR_ERR;
 728         }
 729
 730         devc->cb_data = cb_data;
 731         devc->sent_samples = 0;
 732         devc->empty_transfer_count = 0;
 733         devc->cur_channel = 0;
 734         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 735
 736         if ((trigger = sr_session_trigger_get(sdi->session))) {
 737                 int pre_trigger_samples = 0;
 738                 if (devc->limit_samples > 0)
 739                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 740                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 741                 if (devc->stl == NULL)
 742                         return SR_ERR_MALLOC;
 743                 devc->trigger_fired = FALSE;
 744         } else
 745                 devc->trigger_fired = TRUE;
 746
 747         timeout = get_timeout(devc);
 748         num_transfers = get_number_of_transfers(devc);
 749         size = get_buffer_size(devc);
 750         convsize = (size / devc->num_channels + 2) * 16;
 751         devc->submitted_transfers = 0;
 752
 753         devc->convbuffer_size = convsize;
 754         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 755                 sr_err("Conversion buffer malloc failed.");
 756                 return SR_ERR_MALLOC;
 757         }
 758
 759         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 760         if (!devc->transfers) {
 761                 sr_err("USB transfers malloc failed.");
 762                 g_free(devc->convbuffer);
 763                 return SR_ERR_MALLOC;
 764         }
 765
 766         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 767                                              devc->cur_channels)) != SR_OK) {
 768                 g_free(devc->transfers);
 769                 g_free(devc->convbuffer);
 770                 return ret;
 771         }
 772
 773         devc->num_transfers = num_transfers;
 774         for (i = 0; i < num_transfers; i++) {
 775                 if (!(buf = g_try_malloc(size))) {
 776                         sr_err("USB transfer buffer malloc failed.");
 777                         if (devc->submitted_transfers)
 778                                 abort_acquisition(devc);
 779                         else {
 780                                 g_free(devc->transfers);
 781                                 g_free(devc->convbuffer);
 782                         }
 783                         return SR_ERR_MALLOC;
 784                 }
 785                 transfer = libusb_alloc_transfer(0);
 786                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 787                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 788                                 logic16_receive_transfer, (void *)sdi, timeout);
 789                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 790                         sr_err("Failed to submit transfer: %s.",
 791                                libusb_error_name(ret));
 792                         libusb_free_transfer(transfer);
 793                         g_free(buf);
 794                         abort_acquisition(devc);
 795                         return SR_ERR;
 796                 }
 797                 devc->transfers[i] = transfer;
 798                 devc->submitted_transfers++;
 799         }
 800
 801         devc->ctx = drvc->sr_ctx;
 802
 803         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 804
 805         /* Send header packet to the session bus. */
 806         std_session_send_df_header(cb_data, LOG_PREFIX);
 807
 808         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 809                 abort_acquisition(devc);
 810                 return ret;
 811         }
 812
 813         return SR_OK;
 814 }
 815
 816 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 817 {
 818         int ret;
 819
 820         (void)cb_data;
 821
 822         if (sdi->status != SR_ST_ACTIVE)
 823                 return SR_ERR_DEV_CLOSED;
 824
 825         ret = logic16_abort_acquisition(sdi);
 826
 827         abort_acquisition(sdi->priv);
 828
 829         return ret;
 830 }
 831
 832 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 833         .name = "saleae-logic16",
 834         .longname = "Saleae Logic16",
 835         .api_version = 1,
 836         .init = init,
 837         .cleanup = cleanup,
 838         .scan = scan,
 839         .dev_list = dev_list,
 840         .dev_clear = NULL,
 841         .config_get = config_get,
 842         .config_set = config_set,
 843         .config_list = config_list,
 844         .dev_open = dev_open,
 845         .dev_close = dev_close,
 846         .dev_acquisition_start = dev_acquisition_start,
 847         .dev_acquisition_stop = dev_acquisition_stop,
 848         .priv = NULL,
 849 };