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 <config.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <math.h>
  28 #include <libsigrok/libsigrok.h>
  29 #include "libsigrok-internal.h"
  30 #include "protocol.h"
  31
  32 #define LOGIC16_VID             0x21a9
  33 #define LOGIC16_PID             0x1001
  34
  35 #define USB_INTERFACE           0
  36 #define USB_CONFIGURATION       1
  37 #define FX2_FIRMWARE            FIRMWARE_DIR "/saleae-logic16-fx2.fw"
  38
  39 #define MAX_RENUM_DELAY_MS      3000
  40 #define NUM_SIMUL_TRANSFERS     32
  41
  42 SR_PRIV struct sr_dev_driver 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 };
  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_dev_driver *di, 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(struct sr_dev_driver *di, 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_config *src;
 148         GSList *l, *devices, *conn_devices;
 149         struct libusb_device_descriptor des;
 150         libusb_device **devlist;
 151         int ret;
 152         unsigned int i, j;
 153         const char *conn;
 154         char connection_id[64];
 155
 156         drvc = di->context;
 157
 158         conn = NULL;
 159         for (l = options; l; l = l->next) {
 160                 src = l->data;
 161                 switch (src->key) {
 162                 case SR_CONF_CONN:
 163                         conn = g_variant_get_string(src->data, NULL);
 164                         break;
 165                 }
 166         }
 167         if (conn)
 168                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 169         else
 170                 conn_devices = NULL;
 171
 172         /* Find all Logic16 devices and upload firmware to them. */
 173         devices = NULL;
 174         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 175         for (i = 0; devlist[i]; i++) {
 176                 if (conn) {
 177                         usb = NULL;
 178                         for (l = conn_devices; l; l = l->next) {
 179                                 usb = l->data;
 180                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 181                                     && usb->address == libusb_get_device_address(devlist[i]))
 182                                         break;
 183                         }
 184                         if (!l)
 185                                 /* This device matched none of the ones that
 186                                  * matched the conn specification. */
 187                                 continue;
 188                 }
 189
 190                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 191                         sr_warn("Failed to get device descriptor: %s.",
 192                                 libusb_error_name(ret));
 193                         continue;
 194                 }
 195
 196                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 197
 198                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 199                         continue;
 200
 201                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 202                 sdi->status = SR_ST_INITIALIZING;
 203                 sdi->vendor = g_strdup("Saleae");
 204                 sdi->model = g_strdup("Logic16");
 205                 sdi->driver = di;
 206                 sdi->connection_id = g_strdup(connection_id);
 207
 208                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 209                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE,
 210                                             channel_names[j]);
 211
 212                 devc = g_malloc0(sizeof(struct dev_context));
 213                 devc->selected_voltage_range = VOLTAGE_RANGE_18_33_V;
 214                 sdi->priv = devc;
 215                 drvc->instances = g_slist_append(drvc->instances, sdi);
 216                 devices = g_slist_append(devices, sdi);
 217
 218                 if (check_conf_profile(devlist[i])) {
 219                         /* Already has the firmware, so fix the new address. */
 220                         sr_dbg("Found a Logic16 device.");
 221                         sdi->status = SR_ST_INACTIVE;
 222                         sdi->inst_type = SR_INST_USB;
 223                         sdi->conn = sr_usb_dev_inst_new(
 224                                 libusb_get_bus_number(devlist[i]),
 225                                 libusb_get_device_address(devlist[i]), NULL);
 226                 } else {
 227                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 228                                                   FX2_FIRMWARE) == SR_OK)
 229                                 /* Store when this device's FW was updated. */
 230                                 devc->fw_updated = g_get_monotonic_time();
 231                         else
 232                                 sr_err("Firmware upload failed.");
 233                         sdi->inst_type = SR_INST_USB;
 234                         sdi->conn = sr_usb_dev_inst_new(
 235                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 236                 }
 237         }
 238         libusb_free_device_list(devlist, 1);
 239         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 240
 241         return devices;
 242 }
 243
 244 static GSList *dev_list(const struct sr_dev_driver *di)
 245 {
 246         return ((struct drv_context *)(di->context))->instances;
 247 }
 248
 249 static int logic16_dev_open(struct sr_dev_inst *sdi)
 250 {
 251         struct sr_dev_driver *di;
 252         libusb_device **devlist;
 253         struct sr_usb_dev_inst *usb;
 254         struct libusb_device_descriptor des;
 255         struct drv_context *drvc;
 256         int ret, i, device_count;
 257         char connection_id[64];
 258
 259         di = sdi->driver;
 260         drvc = di->context;
 261         usb = sdi->conn;
 262
 263         if (sdi->status == SR_ST_ACTIVE)
 264                 /* Device is already in use. */
 265                 return SR_ERR;
 266
 267         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 268         if (device_count < 0) {
 269                 sr_err("Failed to get device list: %s.",
 270                        libusb_error_name(device_count));
 271                 return SR_ERR;
 272         }
 273
 274         for (i = 0; i < device_count; i++) {
 275                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 276                         sr_err("Failed to get device descriptor: %s.",
 277                                libusb_error_name(ret));
 278                         continue;
 279                 }
 280
 281                 if (des.idVendor != LOGIC16_VID || des.idProduct != LOGIC16_PID)
 282                         continue;
 283
 284                 if ((sdi->status == SR_ST_INITIALIZING) ||
 285                                 (sdi->status == SR_ST_INACTIVE)) {
 286                         /*
 287                          * Check device by its physical USB bus/port address.
 288                          */
 289                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 290                         if (strcmp(sdi->connection_id, connection_id))
 291                                 /* This is not the one. */
 292                                 continue;
 293                 }
 294
 295                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 296                         if (usb->address == 0xff)
 297                                 /*
 298                                  * First time we touch this device after FW
 299                                  * upload, so we don't know the address yet.
 300                                  */
 301                                 usb->address = libusb_get_device_address(devlist[i]);
 302                 } else {
 303                         sr_err("Failed to open device: %s.",
 304                                libusb_error_name(ret));
 305                         break;
 306                 }
 307
 308                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 309                 if (ret == LIBUSB_ERROR_BUSY) {
 310                         sr_err("Unable to claim USB interface. Another "
 311                                "program or driver has already claimed it.");
 312                         break;
 313                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 314                         sr_err("Device has been disconnected.");
 315                         break;
 316                 } else if (ret != 0) {
 317                         sr_err("Unable to claim interface: %s.",
 318                                libusb_error_name(ret));
 319                         break;
 320                 }
 321
 322                 if ((ret = logic16_init_device(sdi)) != SR_OK) {
 323                         sr_err("Failed to init device.");
 324                         break;
 325                 }
 326
 327                 sdi->status = SR_ST_ACTIVE;
 328                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 329                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 330
 331                 break;
 332         }
 333         libusb_free_device_list(devlist, 1);
 334
 335         if (sdi->status != SR_ST_ACTIVE) {
 336                 if (usb->devhdl) {
 337                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 338                         libusb_close(usb->devhdl);
 339                         usb->devhdl = NULL;
 340                 }
 341                 return SR_ERR;
 342         }
 343
 344         return SR_OK;
 345 }
 346
 347 static int dev_open(struct sr_dev_inst *sdi)
 348 {
 349         struct dev_context *devc;
 350         int ret;
 351         int64_t timediff_us, timediff_ms;
 352
 353         devc = sdi->priv;
 354
 355         /*
 356          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 357          * milliseconds for the FX2 to renumerate.
 358          */
 359         ret = SR_ERR;
 360         if (devc->fw_updated > 0) {
 361                 sr_info("Waiting for device to reset.");
 362                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 363                 g_usleep(300 * 1000);
 364                 timediff_ms = 0;
 365                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 366                         if ((ret = logic16_dev_open(sdi)) == SR_OK)
 367                                 break;
 368                         g_usleep(100 * 1000);
 369
 370                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 371                         timediff_ms = timediff_us / 1000;
 372                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 373                 }
 374                 if (ret != SR_OK) {
 375                         sr_err("Device failed to renumerate.");
 376                         return SR_ERR;
 377                 }
 378                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 379         } else {
 380                 sr_info("Firmware upload was not needed.");
 381                 ret = logic16_dev_open(sdi);
 382         }
 383
 384         if (ret != SR_OK) {
 385                 sr_err("Unable to open device.");
 386                 return SR_ERR;
 387         }
 388
 389         if (devc->cur_samplerate == 0) {
 390                 /* Samplerate hasn't been set; default to the slowest one. */
 391                 devc->cur_samplerate = samplerates[0];
 392         }
 393
 394         return SR_OK;
 395 }
 396
 397 static int dev_close(struct sr_dev_inst *sdi)
 398 {
 399         struct sr_usb_dev_inst *usb;
 400
 401         usb = sdi->conn;
 402         if (!usb->devhdl)
 403                 return SR_ERR;
 404
 405         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 406                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 407         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 408         libusb_close(usb->devhdl);
 409         usb->devhdl = NULL;
 410         sdi->status = SR_ST_INACTIVE;
 411
 412         return SR_OK;
 413 }
 414
 415 static int cleanup(const struct sr_dev_driver *di)
 416 {
 417         int ret;
 418         struct drv_context *drvc;
 419
 420         if (!(drvc = di->context))
 421                 /* Can get called on an unused driver, doesn't matter. */
 422                 return SR_OK;
 423
 424         ret = std_dev_clear(di, NULL);
 425         g_free(drvc);
 426
 427         return ret;
 428 }
 429
 430 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 431                 const struct sr_channel_group *cg)
 432 {
 433         struct dev_context *devc;
 434         struct sr_usb_dev_inst *usb;
 435         GVariant *range[2];
 436         char str[128];
 437         int ret;
 438         unsigned int i;
 439
 440         (void)cg;
 441
 442         ret = SR_OK;
 443         switch (key) {
 444         case SR_CONF_CONN:
 445                 if (!sdi || !sdi->conn)
 446                         return SR_ERR_ARG;
 447                 usb = sdi->conn;
 448                 if (usb->address == 255)
 449                         /* Device still needs to re-enumerate after firmware
 450                          * upload, so we don't know its (future) address. */
 451                         return SR_ERR;
 452                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 453                 *data = g_variant_new_string(str);
 454                 break;
 455         case SR_CONF_SAMPLERATE:
 456                 if (!sdi)
 457                         return SR_ERR;
 458                 devc = sdi->priv;
 459                 *data = g_variant_new_uint64(devc->cur_samplerate);
 460                 break;
 461         case SR_CONF_CAPTURE_RATIO:
 462                 if (!sdi)
 463                         return SR_ERR;
 464                 devc = sdi->priv;
 465                 *data = g_variant_new_uint64(devc->capture_ratio);
 466                 break;
 467         case SR_CONF_VOLTAGE_THRESHOLD:
 468                 if (!sdi)
 469                         return SR_ERR;
 470                 devc = sdi->priv;
 471                 ret = SR_ERR;
 472                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 473                         if (devc->selected_voltage_range !=
 474                             volt_thresholds[i].range)
 475                                 continue;
 476                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 477                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 478                         *data = g_variant_new_tuple(range, 2);
 479                         ret = SR_OK;
 480                         break;
 481                 }
 482                 break;
 483         default:
 484                 return SR_ERR_NA;
 485         }
 486
 487         return ret;
 488 }
 489
 490 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 491                 const struct sr_channel_group *cg)
 492 {
 493         struct dev_context *devc;
 494         gdouble low, high;
 495         int ret;
 496         unsigned int i;
 497
 498         (void)cg;
 499
 500         if (sdi->status != SR_ST_ACTIVE)
 501                 return SR_ERR_DEV_CLOSED;
 502
 503         devc = sdi->priv;
 504
 505         ret = SR_OK;
 506         switch (key) {
 507         case SR_CONF_SAMPLERATE:
 508                 devc->cur_samplerate = g_variant_get_uint64(data);
 509                 break;
 510         case SR_CONF_LIMIT_SAMPLES:
 511                 devc->limit_samples = g_variant_get_uint64(data);
 512                 break;
 513         case SR_CONF_CAPTURE_RATIO:
 514                 devc->capture_ratio = g_variant_get_uint64(data);
 515                 if (devc->capture_ratio > 100) {
 516                         devc->capture_ratio = 0;
 517                         ret = SR_ERR;
 518                 } else
 519                         ret = SR_OK;
 520                 break;
 521         case SR_CONF_VOLTAGE_THRESHOLD:
 522                 g_variant_get(data, "(dd)", &low, &high);
 523                 ret = SR_ERR_ARG;
 524                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 525                         if (fabs(volt_thresholds[i].low - low) < 0.1 &&
 526                             fabs(volt_thresholds[i].high - high) < 0.1) {
 527                                 devc->selected_voltage_range =
 528                                         volt_thresholds[i].range;
 529                                 ret = SR_OK;
 530                                 break;
 531                         }
 532                 }
 533                 break;
 534         default:
 535                 ret = SR_ERR_NA;
 536         }
 537
 538         return ret;
 539 }
 540
 541 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 542                 const struct sr_channel_group *cg)
 543 {
 544         GVariant *gvar, *range[2];
 545         GVariantBuilder gvb;
 546         int ret;
 547         unsigned int i;
 548
 549         (void)sdi;
 550         (void)cg;
 551
 552         ret = SR_OK;
 553         switch (key) {
 554         case SR_CONF_SCAN_OPTIONS:
 555                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 556                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 557                 break;
 558         case SR_CONF_DEVICE_OPTIONS:
 559                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 560                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 561                 break;
 562         case SR_CONF_SAMPLERATE:
 563                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 564                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 565                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 566                 g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 567                 *data = g_variant_builder_end(&gvb);
 568                 break;
 569         case SR_CONF_VOLTAGE_THRESHOLD:
 570                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 571                 for (i = 0; i < ARRAY_SIZE(volt_thresholds); i++) {
 572                         range[0] = g_variant_new_double(volt_thresholds[i].low);
 573                         range[1] = g_variant_new_double(volt_thresholds[i].high);
 574                         gvar = g_variant_new_tuple(range, 2);
 575                         g_variant_builder_add_value(&gvb, gvar);
 576                 }
 577                 *data = g_variant_builder_end(&gvb);
 578                 break;
 579         case SR_CONF_TRIGGER_MATCH:
 580                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 581                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 582                                 sizeof(int32_t));
 583                 break;
 584         default:
 585                 return SR_ERR_NA;
 586         }
 587
 588         return ret;
 589 }
 590
 591 static void abort_acquisition(struct dev_context *devc)
 592 {
 593         int i;
 594
 595         devc->sent_samples = -1;
 596
 597         for (i = devc->num_transfers - 1; i >= 0; i--) {
 598                 if (devc->transfers[i])
 599                         libusb_cancel_transfer(devc->transfers[i]);
 600         }
 601 }
 602
 603 static unsigned int bytes_per_ms(struct dev_context *devc)
 604 {
 605         return devc->cur_samplerate * devc->num_channels / 8000;
 606 }
 607
 608 static size_t get_buffer_size(struct dev_context *devc)
 609 {
 610         size_t s;
 611
 612         /*
 613          * The buffer should be large enough to hold 10ms of data and
 614          * a multiple of 512.
 615          */
 616         s = 10 * bytes_per_ms(devc);
 617         return (s + 511) & ~511;
 618 }
 619
 620 static unsigned int get_number_of_transfers(struct dev_context *devc)
 621 {
 622         unsigned int n;
 623
 624         /* Total buffer size should be able to hold about 500ms of data. */
 625         n = 500 * bytes_per_ms(devc) / get_buffer_size(devc);
 626
 627         if (n > NUM_SIMUL_TRANSFERS)
 628                 return NUM_SIMUL_TRANSFERS;
 629
 630         return n;
 631 }
 632
 633 static unsigned int get_timeout(struct dev_context *devc)
 634 {
 635         size_t total_size;
 636         unsigned int timeout;
 637
 638         total_size = get_buffer_size(devc) * get_number_of_transfers(devc);
 639         timeout = total_size / bytes_per_ms(devc);
 640         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 641 }
 642
 643 static int configure_channels(const struct sr_dev_inst *sdi)
 644 {
 645         struct dev_context *devc;
 646         struct sr_channel *ch;
 647         GSList *l;
 648         uint16_t channel_bit;
 649
 650         devc = sdi->priv;
 651
 652         devc->cur_channels = 0;
 653         devc->num_channels = 0;
 654         for (l = sdi->channels; l; l = l->next) {
 655                 ch = (struct sr_channel *)l->data;
 656                 if (ch->enabled == FALSE)
 657                         continue;
 658
 659                 channel_bit = 1 << (ch->index);
 660
 661                 devc->cur_channels |= channel_bit;
 662
 663 #ifdef WORDS_BIGENDIAN
 664                 /*
 665                  * Output logic data should be stored in little endian format.
 666                  * To speed things up during conversion, do the switcharoo
 667                  * here instead.
 668                  */
 669                 channel_bit = 1 << (ch->index ^ 8);
 670 #endif
 671
 672                 devc->channel_masks[devc->num_channels++] = channel_bit;
 673         }
 674
 675         return SR_OK;
 676 }
 677
 678 static int receive_data(int fd, int revents, void *cb_data)
 679 {
 680         struct timeval tv;
 681         struct dev_context *devc;
 682         struct drv_context *drvc;
 683         const struct sr_dev_inst *sdi;
 684         struct sr_dev_driver *di;
 685
 686         (void)fd;
 687         (void)revents;
 688
 689         sdi = cb_data;
 690         di = sdi->driver;
 691         drvc = di->context;
 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 sr_dev_driver *di = sdi->driver;
 708         struct dev_context *devc;
 709         struct drv_context *drvc;
 710         struct sr_usb_dev_inst *usb;
 711         struct sr_trigger *trigger;
 712         struct libusb_transfer *transfer;
 713         unsigned int i, timeout, num_transfers;
 714         int ret;
 715         unsigned char *buf;
 716         size_t size, convsize;
 717
 718         if (sdi->status != SR_ST_ACTIVE)
 719                 return SR_ERR_DEV_CLOSED;
 720
 721         drvc = di->context;
 722         devc = sdi->priv;
 723         usb = sdi->conn;
 724
 725         /* Configures devc->cur_channels. */
 726         if (configure_channels(sdi) != SR_OK) {
 727                 sr_err("Failed to configure channels.");
 728                 return SR_ERR;
 729         }
 730
 731         devc->cb_data = cb_data;
 732         devc->sent_samples = 0;
 733         devc->empty_transfer_count = 0;
 734         devc->cur_channel = 0;
 735         memset(devc->channel_data, 0, sizeof(devc->channel_data));
 736
 737         if ((trigger = sr_session_trigger_get(sdi->session))) {
 738                 int pre_trigger_samples = 0;
 739                 if (devc->limit_samples > 0)
 740                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 741                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 742                 if (!devc->stl)
 743                         return SR_ERR_MALLOC;
 744                 devc->trigger_fired = FALSE;
 745         } else
 746                 devc->trigger_fired = TRUE;
 747
 748         timeout = get_timeout(devc);
 749         num_transfers = get_number_of_transfers(devc);
 750         size = get_buffer_size(devc);
 751         convsize = (size / devc->num_channels + 2) * 16;
 752         devc->submitted_transfers = 0;
 753
 754         devc->convbuffer_size = convsize;
 755         if (!(devc->convbuffer = g_try_malloc(convsize))) {
 756                 sr_err("Conversion buffer malloc failed.");
 757                 return SR_ERR_MALLOC;
 758         }
 759
 760         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 761         if (!devc->transfers) {
 762                 sr_err("USB transfers malloc failed.");
 763                 g_free(devc->convbuffer);
 764                 return SR_ERR_MALLOC;
 765         }
 766
 767         if ((ret = logic16_setup_acquisition(sdi, devc->cur_samplerate,
 768                                              devc->cur_channels)) != SR_OK) {
 769                 g_free(devc->transfers);
 770                 g_free(devc->convbuffer);
 771                 return ret;
 772         }
 773
 774         devc->num_transfers = num_transfers;
 775         for (i = 0; i < num_transfers; i++) {
 776                 if (!(buf = g_try_malloc(size))) {
 777                         sr_err("USB transfer buffer malloc failed.");
 778                         if (devc->submitted_transfers)
 779                                 abort_acquisition(devc);
 780                         else {
 781                                 g_free(devc->transfers);
 782                                 g_free(devc->convbuffer);
 783                         }
 784                         return SR_ERR_MALLOC;
 785                 }
 786                 transfer = libusb_alloc_transfer(0);
 787                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 788                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 789                                 logic16_receive_transfer, (void *)sdi, timeout);
 790                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 791                         sr_err("Failed to submit transfer: %s.",
 792                                libusb_error_name(ret));
 793                         libusb_free_transfer(transfer);
 794                         g_free(buf);
 795                         abort_acquisition(devc);
 796                         return SR_ERR;
 797                 }
 798                 devc->transfers[i] = transfer;
 799                 devc->submitted_transfers++;
 800         }
 801
 802         devc->ctx = drvc->sr_ctx;
 803
 804         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, (void *)sdi);
 805
 806         /* Send header packet to the session bus. */
 807         std_session_send_df_header(cb_data, LOG_PREFIX);
 808
 809         if ((ret = logic16_start_acquisition(sdi)) != SR_OK) {
 810                 abort_acquisition(devc);
 811                 return ret;
 812         }
 813
 814         return SR_OK;
 815 }
 816
 817 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 818 {
 819         int ret;
 820
 821         (void)cb_data;
 822
 823         if (sdi->status != SR_ST_ACTIVE)
 824                 return SR_ERR_DEV_CLOSED;
 825
 826         ret = logic16_abort_acquisition(sdi);
 827
 828         abort_acquisition(sdi->priv);
 829
 830         return ret;
 831 }
 832
 833 SR_PRIV struct sr_dev_driver saleae_logic16_driver_info = {
 834         .name = "saleae-logic16",
 835         .longname = "Saleae Logic16",
 836         .api_version = 1,
 837         .init = init,
 838         .cleanup = cleanup,
 839         .scan = scan,
 840         .dev_list = dev_list,
 841         .dev_clear = NULL,
 842         .config_get = config_get,
 843         .config_set = config_set,
 844         .config_list = config_list,
 845         .dev_open = dev_open,
 846         .dev_close = dev_close,
 847         .dev_acquisition_start = dev_acquisition_start,
 848         .dev_acquisition_stop = dev_acquisition_stop,
 849         .context = NULL,
 850 };