hardware/fx2lafw/fx2lafw.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <inttypes.h>
  23 #include <glib.h>
  24 #include <libusb.h>
  25 #include "config.h"
  26 #include "sigrok.h"
  27 #include "sigrok-internal.h"
  28 #include "fx2lafw.h"
  29 #include "command.h"
  30
  31 static const struct fx2lafw_profile supported_fx2[] = {
  32         /*
  33          * CWAV USBee AX
  34          * EE Electronics ESLA201A
  35          */
  36         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  37                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  38
  39         /*
  40          * CWAV USBee SX
  41          */
  42         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  43                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  44
  45         /*
  46          * Saleae Logic
  47          * EE Electronics ESLA100
  48          * Robomotic MiniLogic
  49          */
  50         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  51                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  52
  53         /*
  54          * Default Cypress FX2 without EEPROM
  55          */
  56         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  57                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  58
  59         { 0, 0, 0, 0, 0, 0, 0 }
  60 };
  61
  62 static int hwcaps[] = {
  63         SR_HWCAP_LOGIC_ANALYZER,
  64         SR_HWCAP_SAMPLERATE,
  65
  66         /* These are really implemented in the driver, not the hardware. */
  67         SR_HWCAP_LIMIT_SAMPLES,
  68         SR_HWCAP_CONTINUOUS,
  69         0,
  70 };
  71
  72 /*
  73  * TODO: Different probe_names[] for each supported device.
  74  */
  75 static const char *probe_names[] = {
  76         "0",
  77         "1",
  78         "2",
  79         "3",
  80         "4",
  81         "5",
  82         "6",
  83         "7",
  84         NULL,
  85 };
  86
  87 static uint64_t supported_samplerates[] = {
  88         SR_KHZ(200),
  89         SR_KHZ(250),
  90         SR_KHZ(500),
  91         SR_MHZ(1),
  92         SR_MHZ(2),
  93         SR_MHZ(3),
  94         SR_MHZ(4),
  95         SR_MHZ(6),
  96         SR_MHZ(8),
  97         SR_MHZ(12),
  98         SR_MHZ(16),
  99         SR_MHZ(24),
 100         0,
 101 };
 102
 103 static struct sr_samplerates samplerates = {
 104         0,
 105         0,
 106         0,
 107         supported_samplerates,
 108 };
 109
 110 static GSList *dev_insts = NULL;
 111 static libusb_context *usb_context = NULL;
 112
 113 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 114 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 115
 116 /**
 117  * Check the USB configuration to determine if this is an fx2lafw device.
 118  *
 119  * @return TRUE if the device's configuration profile match fx2lafw
 120  *         configuration, FALSE otherwise.
 121  */
 122 static gboolean check_conf_profile(libusb_device *dev)
 123 {
 124         struct libusb_device_descriptor des;
 125         struct libusb_config_descriptor *conf_dsc = NULL;
 126         const struct libusb_interface_descriptor *intf_dsc;
 127         gboolean ret = FALSE;
 128
 129         while (!ret) {
 130                 /* Assume the FW has not been loaded, unless proven wrong. */
 131                 ret = FALSE;
 132
 133                 if (libusb_get_device_descriptor(dev, &des) != 0)
 134                         break;
 135
 136                 /* Need exactly 1 configuration. */
 137                 if (des.bNumConfigurations != 1)
 138                         break;
 139
 140                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 141                         break;
 142
 143                 /* Need exactly 1 interface. */
 144                 if (conf_dsc->bNumInterfaces != 1)
 145                         break;
 146
 147                 /* Need just one alternate setting. */
 148                 if (conf_dsc->interface[0].num_altsetting != 1)
 149                         break;
 150
 151                 /* Need exactly 2 endpoints. */
 152                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 153                 if (intf_dsc->bNumEndpoints != 2)
 154                         break;
 155
 156                 /* The first endpoint should be 2 (inbound). */
 157                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 158                     (2 | LIBUSB_ENDPOINT_IN))
 159                         break;
 160
 161                 /* If we made it here, it must be an fx2lafw. */
 162                 ret = TRUE;
 163         }
 164
 165         if (conf_dsc)
 166                 libusb_free_config_descriptor(conf_dsc);
 167
 168         return ret;
 169 }
 170
 171 static int fx2lafw_dev_open(int dev_index)
 172 {
 173         libusb_device **devlist;
 174         struct libusb_device_descriptor des;
 175         struct sr_dev_inst *sdi;
 176         struct context *ctx;
 177         struct version_info vi;
 178         int ret, skip, i;
 179
 180         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 181                 return SR_ERR;
 182         ctx = sdi->priv;
 183
 184         if (sdi->status == SR_ST_ACTIVE)
 185                 /* already in use */
 186                 return SR_ERR;
 187
 188         skip = 0;
 189         const int device_count = libusb_get_device_list(usb_context, &devlist);
 190         if (device_count < 0) {
 191                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 192                         device_count);
 193                 return SR_ERR;
 194         }
 195
 196         for (i = 0; i < device_count; i++) {
 197                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 198                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 199                                ret);
 200                         continue;
 201                 }
 202
 203                 if (des.idVendor != ctx->profile->vid
 204                     || des.idProduct != ctx->profile->pid)
 205                         continue;
 206
 207                 if (sdi->status == SR_ST_INITIALIZING) {
 208                         if (skip != dev_index) {
 209                                 /* Skip devices of this type that aren't the one we want. */
 210                                 skip += 1;
 211                                 continue;
 212                         }
 213                 } else if (sdi->status == SR_ST_INACTIVE) {
 214                         /*
 215                          * This device is fully enumerated, so we need to find
 216                          * this device by vendor, product, bus and address.
 217                          */
 218                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 219                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 220                                 /* this is not the one */
 221                                 continue;
 222                 }
 223
 224                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 225                         if (ctx->usb->address == 0xff)
 226                                 /*
 227                                  * first time we touch this device after firmware upload,
 228                                  * so we don't know the address yet.
 229                                  */
 230                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 231                 } else {
 232                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 233                         break;
 234                 }
 235
 236                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 237                 if (ret != SR_OK) {
 238                         sr_err("fx2lafw: Failed to retrieve "
 239                                "firmware version information.");
 240                         break;
 241                 }
 242
 243                 if (vi.major != FX2LAFW_VERSION_MAJOR ||
 244                     vi.minor != FX2LAFW_VERSION_MINOR) {
 245                         sr_err("fx2lafw: Expected firmware version %d.%02d "
 246                                "got %d.%02d.", FX2LAFW_VERSION_MAJOR,
 247                                FX2LAFW_VERSION_MINOR, vi.major, vi.minor);
 248                         break;
 249                 }
 250
 251                 sdi->status = SR_ST_ACTIVE;
 252                 sr_info("fx2lafw: Opened device %d on %d.%d "
 253                         "interface %d, firmware version %d.%02d",
 254                         sdi->index, ctx->usb->bus, ctx->usb->address,
 255                         USB_INTERFACE, vi.major, vi.minor);
 256
 257                 break;
 258         }
 259         libusb_free_device_list(devlist, 1);
 260
 261         if (sdi->status != SR_ST_ACTIVE)
 262                 return SR_ERR;
 263
 264         return SR_OK;
 265 }
 266
 267 static void close_dev(struct sr_dev_inst *sdi)
 268 {
 269         struct context *ctx;
 270
 271         ctx = sdi->priv;
 272
 273         if (ctx->usb->devhdl == NULL)
 274                 return;
 275
 276         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 277                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 278         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 279         libusb_close(ctx->usb->devhdl);
 280         ctx->usb->devhdl = NULL;
 281         sdi->status = SR_ST_INACTIVE;
 282 }
 283
 284 static int configure_probes(struct context *ctx, GSList *probes)
 285 {
 286         struct sr_probe *probe;
 287         GSList *l;
 288         int probe_bit, stage, i;
 289         char *tc;
 290
 291         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 292                 ctx->trigger_mask[i] = 0;
 293                 ctx->trigger_value[i] = 0;
 294         }
 295
 296         stage = -1;
 297         for (l = probes; l; l = l->next) {
 298                 probe = (struct sr_probe *)l->data;
 299                 if (probe->enabled == FALSE)
 300                         continue;
 301                 probe_bit = 1 << (probe->index - 1);
 302                 if (!(probe->trigger))
 303                         continue;
 304
 305                 stage = 0;
 306                 for (tc = probe->trigger; *tc; tc++) {
 307                         ctx->trigger_mask[stage] |= probe_bit;
 308                         if (*tc == '1')
 309                                 ctx->trigger_value[stage] |= probe_bit;
 310                         stage++;
 311                         if (stage > NUM_TRIGGER_STAGES)
 312                                 return SR_ERR;
 313                 }
 314         }
 315
 316         if (stage == -1)
 317                 /*
 318                  * We didn't configure any triggers, make sure acquisition
 319                  * doesn't wait for any.
 320                  */
 321                 ctx->trigger_stage = TRIGGER_FIRED;
 322         else
 323                 ctx->trigger_stage = 0;
 324
 325         return SR_OK;
 326 }
 327
 328 static struct context *fx2lafw_dev_new(void)
 329 {
 330         struct context *ctx;
 331
 332         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 333                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 334                 return NULL;
 335         }
 336
 337         ctx->trigger_stage = TRIGGER_FIRED;
 338
 339         return ctx;
 340 }
 341
 342 /*
 343  * API callbacks
 344  */
 345
 346 static int hw_init(const char *devinfo)
 347 {
 348         struct sr_dev_inst *sdi;
 349         struct libusb_device_descriptor des;
 350         const struct fx2lafw_profile *prof;
 351         struct context *ctx;
 352         libusb_device **devlist;
 353         int ret;
 354         int devcnt = 0;
 355         int i, j;
 356
 357         /* Avoid compiler warnings. */
 358         (void)devinfo;
 359
 360         if (libusb_init(&usb_context) != 0) {
 361                 sr_warn("fx2lafw: Failed to initialize libusb.");
 362                 return 0;
 363         }
 364
 365         /* Find all fx2lafw compatible devices and upload firware to them. */
 366         libusb_get_device_list(usb_context, &devlist);
 367         for (i = 0; devlist[i]; i++) {
 368
 369                 if ((ret = libusb_get_device_descriptor(
 370                      devlist[i], &des)) != 0) {
 371                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 372                         continue;
 373                 }
 374
 375                 prof = NULL;
 376                 for (j = 0; supported_fx2[j].vid; j++) {
 377                         if (des.idVendor == supported_fx2[j].vid &&
 378                                 des.idProduct == supported_fx2[j].pid) {
 379                                 prof = &supported_fx2[j];
 380                         }
 381                 }
 382
 383                 /* Skip if the device was not found */
 384                 if (!prof)
 385                         continue;
 386
 387                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 388                         prof->vendor, prof->model, prof->model_version);
 389                 if (!sdi)
 390                         return 0;
 391
 392                 ctx = fx2lafw_dev_new();
 393                 ctx->profile = prof;
 394                 sdi->priv = ctx;
 395                 dev_insts = g_slist_append(dev_insts, sdi);
 396
 397                 if (check_conf_profile(devlist[i])) {
 398                         /* Already has the firmware, so fix the new address. */
 399                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 400                         sdi->status = SR_ST_INACTIVE;
 401                         ctx->usb = sr_usb_dev_inst_new
 402                             (libusb_get_bus_number(devlist[i]),
 403                              libusb_get_device_address(devlist[i]), NULL);
 404                 } else {
 405                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 406                                 prof->firmware) == SR_OK)
 407                                 /* Remember when the firmware on this device was updated */
 408                                 g_get_current_time(&ctx->fw_updated);
 409                         else
 410                                 sr_err("fx2lafw: Firmware upload failed for "
 411                                        "device %d.", devcnt);
 412                         ctx->usb = sr_usb_dev_inst_new
 413                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 414                 }
 415
 416                 devcnt++;
 417         }
 418         libusb_free_device_list(devlist, 1);
 419
 420         return devcnt;
 421 }
 422
 423 static int hw_dev_open(int dev_index)
 424 {
 425         GTimeVal cur_time;
 426         struct sr_dev_inst *sdi;
 427         struct context *ctx;
 428         int timediff, ret;
 429
 430         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 431                 return SR_ERR;
 432         ctx = sdi->priv;
 433
 434         /*
 435          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY ms
 436          * for the FX2 to renumerate.
 437          */
 438         ret = 0;
 439         if (GTV_TO_MSEC(ctx->fw_updated) > 0) {
 440                 sr_info("fx2lafw: Waiting for device to reset.");
 441                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 442                 g_usleep(300 * 1000);
 443                 timediff = 0;
 444                 while (timediff < MAX_RENUM_DELAY) {
 445                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 446                                 break;
 447                         g_usleep(100 * 1000);
 448                         g_get_current_time(&cur_time);
 449                         timediff = GTV_TO_MSEC(cur_time) - GTV_TO_MSEC(ctx->fw_updated);
 450                 }
 451                 sr_info("fx2lafw: Device came back after %d ms.", timediff);
 452         } else {
 453                 ret = fx2lafw_dev_open(dev_index);
 454         }
 455
 456         if (ret != SR_OK) {
 457                 sr_err("fx2lafw: Unable to open device.");
 458                 return SR_ERR;
 459         }
 460         ctx = sdi->priv;
 461
 462         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 463         if (ret != 0) {
 464                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 465                 return SR_ERR;
 466         }
 467
 468         if (ctx->cur_samplerate == 0) {
 469                 /* Samplerate hasn't been set; default to the slowest one. */
 470                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 471                     &supported_samplerates[0]) == SR_ERR)
 472                         return SR_ERR;
 473         }
 474
 475         return SR_OK;
 476 }
 477
 478 static int hw_dev_close(int dev_index)
 479 {
 480         struct sr_dev_inst *sdi;
 481
 482         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 483                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 484                 return SR_ERR_BUG;
 485         }
 486
 487         /* TODO */
 488         close_dev(sdi);
 489
 490         return SR_OK;
 491 }
 492
 493 static int hw_cleanup(void)
 494 {
 495         GSList *l;
 496         struct sr_dev_inst *sdi;
 497         struct context *ctx;
 498         int ret = SR_OK;
 499
 500         for (l = dev_insts; l; l = l->next) {
 501                 if (!(sdi = l->data)) {
 502                         /* Log error, but continue cleaning up the rest. */
 503                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 504                                __func__);
 505                         ret = SR_ERR_BUG;
 506                         continue;
 507                 }
 508                 if (!(ctx = sdi->priv)) {
 509                         /* Log error, but continue cleaning up the rest. */
 510                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 511                                __func__);
 512                         ret = SR_ERR_BUG;
 513                         continue;
 514                 }
 515                 close_dev(sdi);
 516                 sdi = l->data;
 517                 sr_dev_inst_free(sdi);
 518         }
 519
 520         g_slist_free(dev_insts);
 521         dev_insts = NULL;
 522
 523         if (usb_context)
 524                 libusb_exit(usb_context);
 525         usb_context = NULL;
 526
 527         return ret;
 528 }
 529
 530 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 531 {
 532         struct sr_dev_inst *sdi;
 533         struct context *ctx;
 534
 535         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 536                 return NULL;
 537         ctx = sdi->priv;
 538
 539         switch (dev_info_id) {
 540         case SR_DI_INST:
 541                 return sdi;
 542         case SR_DI_NUM_PROBES:
 543                 return GINT_TO_POINTER(ctx->profile->num_probes);
 544         case SR_DI_PROBE_NAMES:
 545                 return probe_names;
 546         case SR_DI_SAMPLERATES:
 547                 return &samplerates;
 548         case SR_DI_TRIGGER_TYPES:
 549                 return TRIGGER_TYPES;
 550         case SR_DI_CUR_SAMPLERATE:
 551                 return &ctx->cur_samplerate;
 552         }
 553
 554         return NULL;
 555 }
 556
 557 static int hw_dev_status_get(int dev_index)
 558 {
 559         const struct sr_dev_inst *const sdi =
 560                 sr_dev_inst_get(dev_insts, dev_index);
 561
 562         if (!sdi)
 563                 return SR_ST_NOT_FOUND;
 564
 565         return sdi->status;
 566 }
 567
 568 static int *hw_hwcap_get_all(void)
 569 {
 570         return hwcaps;
 571 }
 572
 573 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 574 {
 575         struct sr_dev_inst *sdi;
 576         struct context *ctx;
 577         int ret;
 578
 579         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 580                 return SR_ERR;
 581         ctx = sdi->priv;
 582
 583         if (hwcap == SR_HWCAP_SAMPLERATE) {
 584                 ctx->cur_samplerate = *(uint64_t *)value;
 585                 ret = SR_OK;
 586         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 587                 ret = configure_probes(ctx, (GSList *) value);
 588         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 589                 ctx->limit_samples = *(uint64_t *)value;
 590                 ret = SR_OK;
 591         } else {
 592                 ret = SR_ERR;
 593         }
 594
 595         return ret;
 596 }
 597
 598 static int receive_data(int fd, int revents, void *cb_data)
 599 {
 600         struct timeval tv;
 601
 602         /* Avoid compiler warnings. */
 603         (void)fd;
 604         (void)revents;
 605         (void)cb_data;
 606
 607         tv.tv_sec = tv.tv_usec = 0;
 608         libusb_handle_events_timeout(usb_context, &tv);
 609
 610         return TRUE;
 611 }
 612
 613 static void abort_acquisition(struct context *ctx)
 614 {
 615         ctx->num_samples = -1;
 616 }
 617
 618 static void finish_acquisition(struct context *ctx)
 619 {
 620         struct sr_datafeed_packet packet;
 621         int i;
 622
 623         /* Terminate session */
 624         packet.type = SR_DF_END;
 625         sr_session_send(ctx->session_dev_id, &packet);
 626
 627         /* Remove fds from polling */
 628         const struct libusb_pollfd **const lupfd =
 629                 libusb_get_pollfds(usb_context);
 630         for (i = 0; lupfd[i]; i++)
 631                 sr_source_remove(lupfd[i]->fd);
 632         free(lupfd); /* NOT g_free()! */
 633 }
 634
 635 static void receive_transfer(struct libusb_transfer *transfer)
 636 {
 637         /* TODO: These statics have to move to the ctx struct. */
 638         static int empty_transfer_count = 0;
 639         struct sr_datafeed_packet packet;
 640         struct sr_datafeed_logic logic;
 641         struct context *ctx = transfer->user_data;
 642         int cur_buflen, trigger_offset, i;
 643         unsigned char *cur_buf, *new_buf;
 644
 645         /*
 646          * If acquisition has already ended, just free any queued up
 647          * transfer that come in.
 648          */
 649         if (ctx->num_samples == -1) {
 650                 if (transfer)
 651                         libusb_free_transfer(transfer);
 652
 653                 ctx->submitted_transfers--;
 654                 if (ctx->submitted_transfers == 0)
 655                         finish_acquisition(ctx);
 656
 657                 return;
 658         }
 659
 660         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 661                 transfer->status, transfer->actual_length);
 662
 663         /* Save incoming transfer before reusing the transfer struct. */
 664         cur_buf = transfer->buffer;
 665         cur_buflen = transfer->actual_length;
 666
 667         /* Fire off a new request. */
 668         if (!(new_buf = g_try_malloc(4096))) {
 669                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 670                 return; /* TODO: SR_ERR_MALLOC */
 671         }
 672
 673         transfer->buffer = new_buf;
 674         transfer->length = 4096;
 675         if (libusb_submit_transfer(transfer) != 0) {
 676                 /* TODO: Stop session? */
 677                 /* TODO: Better error message. */
 678                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 679         }
 680
 681         if (cur_buflen == 0) {
 682                 empty_transfer_count++;
 683                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 684                         /*
 685                          * The FX2 gave up. End the acquisition, the frontend
 686                          * will work out that the samplecount is short.
 687                          */
 688                         abort_acquisition(ctx);
 689                 }
 690                 return;
 691         } else {
 692                 empty_transfer_count = 0;
 693         }
 694
 695         trigger_offset = 0;
 696         if (ctx->trigger_stage >= 0) {
 697                 for (i = 0; i < cur_buflen; i++) {
 698
 699                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 700                                 /* Match on this trigger stage. */
 701                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 702                                 ctx->trigger_stage++;
 703
 704                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 705                                         /* Match on all trigger stages, we're done. */
 706                                         trigger_offset = i + 1;
 707
 708                                         /*
 709                                          * TODO: Send pre-trigger buffer to session bus.
 710                                          * Tell the frontend we hit the trigger here.
 711                                          */
 712                                         packet.type = SR_DF_TRIGGER;
 713                                         packet.payload = NULL;
 714                                         sr_session_send(ctx->session_dev_id, &packet);
 715
 716                                         /*
 717                                          * Send the samples that triggered it, since we're
 718                                          * skipping past them.
 719                                          */
 720                                         packet.type = SR_DF_LOGIC;
 721                                         packet.payload = &logic;
 722                                         logic.length = ctx->trigger_stage;
 723                                         logic.unitsize = 1;
 724                                         logic.data = ctx->trigger_buffer;
 725                                         sr_session_send(ctx->session_dev_id, &packet);
 726
 727                                         ctx->trigger_stage = TRIGGER_FIRED;
 728                                         break;
 729                                 }
 730                                 return;
 731                         }
 732
 733                         /*
 734                          * We had a match before, but not in the next sample. However, we may
 735                          * have a match on this stage in the next bit -- trigger on 0001 will
 736                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 737                          * the next sample from the one that matched originally, which the
 738                          * counter increment at the end of the loop takes care of.
 739                          */
 740                         if (ctx->trigger_stage > 0) {
 741                                 i -= ctx->trigger_stage;
 742                                 if (i < -1)
 743                                         i = -1; /* Oops, went back past this buffer. */
 744                                 /* Reset trigger stage. */
 745                                 ctx->trigger_stage = 0;
 746                         }
 747                 }
 748         }
 749
 750         if (ctx->trigger_stage == TRIGGER_FIRED) {
 751                 /* Send the incoming transfer to the session bus. */
 752                 packet.type = SR_DF_LOGIC;
 753                 packet.payload = &logic;
 754                 logic.length = cur_buflen - trigger_offset;
 755                 logic.unitsize = 1;
 756                 logic.data = cur_buf + trigger_offset;
 757                 sr_session_send(ctx->session_dev_id, &packet);
 758                 g_free(cur_buf);
 759
 760                 ctx->num_samples += cur_buflen;
 761                 if (ctx->limit_samples &&
 762                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 763                         abort_acquisition(ctx);
 764                 }
 765         } else {
 766                 /*
 767                  * TODO: Buffer pre-trigger data in capture
 768                  * ratio-sized buffer.
 769                  */
 770         }
 771 }
 772
 773 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 774 {
 775         struct sr_dev_inst *sdi;
 776         struct sr_datafeed_packet *packet;
 777         struct sr_datafeed_header *header;
 778         struct context *ctx;
 779         struct libusb_transfer *transfer;
 780         const struct libusb_pollfd **lupfd;
 781         int ret, size, i;
 782         unsigned char *buf;
 783
 784         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 785                 return SR_ERR;
 786         ctx = sdi->priv;
 787         ctx->session_dev_id = cb_data;
 788         ctx->num_samples = 0;
 789
 790         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 791                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 792                 return SR_ERR_MALLOC;
 793         }
 794
 795         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 796                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 797                 return SR_ERR_MALLOC;
 798         }
 799
 800         /* Start with 2K transfer, subsequently increased to 4K. */
 801         size = 2048;
 802         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 803                 if (!(buf = g_try_malloc(size))) {
 804                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 805                         return SR_ERR_MALLOC;
 806                 }
 807                 transfer = libusb_alloc_transfer(0);
 808                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 809                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 810                                 receive_transfer, ctx, 40);
 811                 if (libusb_submit_transfer(transfer) != 0) {
 812                         /* TODO: Free them all. */
 813                         libusb_free_transfer(transfer);
 814                         g_free(buf);
 815                         return SR_ERR;
 816                 }
 817
 818                 ctx->submitted_transfers++;
 819                 size = 4096;
 820         }
 821
 822         lupfd = libusb_get_pollfds(usb_context);
 823         for (i = 0; lupfd[i]; i++)
 824                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 825                               40, receive_data, NULL);
 826         free(lupfd); /* NOT g_free()! */
 827
 828         packet->type = SR_DF_HEADER;
 829         packet->payload = header;
 830         header->feed_version = 1;
 831         gettimeofday(&header->starttime, NULL);
 832         header->samplerate = ctx->cur_samplerate;
 833         header->num_logic_probes = ctx->profile->num_probes;
 834         sr_session_send(cb_data, packet);
 835         g_free(header);
 836         g_free(packet);
 837
 838         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 839                 ctx->cur_samplerate)) != SR_OK) {
 840                 return ret;
 841         }
 842
 843         return SR_OK;
 844 }
 845
 846 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 847 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 848 {
 849         struct sr_dev_inst *sdi;
 850
 851         /* Avoid compiler warnings. */
 852         (void)cb_data;
 853
 854         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 855                 return SR_ERR;
 856
 857         abort_acquisition(sdi->priv);
 858
 859         return SR_OK;
 860 }
 861
 862 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 863         .name = "fx2lafw",
 864         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 865         .api_version = 1,
 866         .init = hw_init,
 867         .cleanup = hw_cleanup,
 868         .dev_open = hw_dev_open,
 869         .dev_close = hw_dev_close,
 870         .dev_info_get = hw_dev_info_get,
 871         .dev_status_get = hw_dev_status_get,
 872         .hwcap_get_all = hw_hwcap_get_all,
 873         .dev_config_set = hw_dev_config_set,
 874         .dev_acquisition_start = hw_dev_acquisition_start,
 875         .dev_acquisition_stop = hw_dev_acquisition_stop,
 876 };