hardware/fx2lafw/fx2lafw.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <inttypes.h>
  25 #include <libusb.h>
  26 #include "config.h"
  27 #include "sigrok.h"
  28 #include "sigrok-internal.h"
  29 #include "fx2lafw.h"
  30 #include "command.h"
  31
  32 static const struct fx2lafw_profile supported_fx2[] = {
  33         /*
  34          * CWAV USBee AX
  35          * EE Electronics ESLA201A
  36          * ARMFLY AX-Pro
  37          */
  38         { 0x08a9, 0x0014, "CWAV", "USBee AX", NULL,
  39                 FIRMWARE_DIR "/fx2lafw-cwav-usbeeax.fw", 8 },
  40
  41         /*
  42          * CWAV USBee SX
  43          */
  44         { 0x08a9, 0x0009, "CWAV", "USBee SX", NULL,
  45                 FIRMWARE_DIR "/fx2lafw-cwav-usbeesx.fw", 8 },
  46
  47         /*
  48          * Saleae Logic
  49          * EE Electronics ESLA100
  50          * Robomotic MiniLogic
  51          * Robomotic BugLogic 3
  52          */
  53         { 0x0925, 0x3881, "Saleae", "Logic", NULL,
  54                 FIRMWARE_DIR "/fx2lafw-saleae-logic.fw", 8 },
  55
  56         /*
  57          * Default Cypress FX2 without EEPROM, e.g.:
  58          * Lcsoft Mini Board
  59          * Braintechnology USB Interface V2.x
  60          */
  61         { 0x04B4, 0x8613, "Cypress", "FX2", NULL,
  62                 FIRMWARE_DIR "/fx2lafw-cypress-fx2.fw", 8 },
  63
  64         /*
  65          * Braintechnology USB-LPS
  66          */
  67         { 0x16d0, 0x0498, "Braintechnology", "USB-LPS", NULL,
  68                 FIRMWARE_DIR "/fx2lafw-braintechnology-usb-lps.fw", 8 },
  69
  70         { 0, 0, 0, 0, 0, 0, 0 }
  71 };
  72
  73 static const int hwcaps[] = {
  74         SR_HWCAP_LOGIC_ANALYZER,
  75         SR_HWCAP_SAMPLERATE,
  76
  77         /* These are really implemented in the driver, not the hardware. */
  78         SR_HWCAP_LIMIT_SAMPLES,
  79         SR_HWCAP_CONTINUOUS,
  80         0,
  81 };
  82
  83 /*
  84  * TODO: Different probe_names[] for each supported device.
  85  */
  86 static const char *probe_names[] = {
  87         "0",
  88         "1",
  89         "2",
  90         "3",
  91         "4",
  92         "5",
  93         "6",
  94         "7",
  95         NULL,
  96 };
  97
  98 static uint64_t supported_samplerates[] = {
  99         SR_KHZ(20),
 100         SR_KHZ(25),
 101         SR_KHZ(50),
 102         SR_KHZ(100),
 103         SR_KHZ(200),
 104         SR_KHZ(250),
 105         SR_KHZ(500),
 106         SR_MHZ(1),
 107         SR_MHZ(2),
 108         SR_MHZ(3),
 109         SR_MHZ(4),
 110         SR_MHZ(6),
 111         SR_MHZ(8),
 112         SR_MHZ(12),
 113         SR_MHZ(16),
 114         SR_MHZ(24),
 115         0,
 116 };
 117
 118 static struct sr_samplerates samplerates = {
 119         0,
 120         0,
 121         0,
 122         supported_samplerates,
 123 };
 124
 125 static GSList *dev_insts = NULL;
 126 static libusb_context *usb_context = NULL;
 127
 128 static int hw_dev_config_set(int dev_index, int hwcap, void *value);
 129 static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
 130
 131 /**
 132  * Check the USB configuration to determine if this is an fx2lafw device.
 133  *
 134  * @return TRUE if the device's configuration profile match fx2lafw
 135  *         configuration, FALSE otherwise.
 136  */
 137 static gboolean check_conf_profile(libusb_device *dev)
 138 {
 139         struct libusb_device_descriptor des;
 140         struct libusb_device_handle *hdl;
 141         gboolean ret;
 142         unsigned char strdesc[64];
 143
 144         hdl = NULL;
 145         ret = FALSE;
 146         while (!ret) {
 147                 /* Assume the FW has not been loaded, unless proven wrong. */
 148                 if (libusb_get_device_descriptor(dev, &des) != 0)
 149                         break;
 150
 151                 if (libusb_open(dev, &hdl) != 0)
 152                         break;
 153
 154                 if (libusb_get_string_descriptor_ascii(hdl,
 155                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 156                         break;
 157                 if (strncmp((const char *)strdesc, "sigrok", 6))
 158                         break;
 159
 160                 if (libusb_get_string_descriptor_ascii(hdl,
 161                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 162                         break;
 163                 if (strncmp((const char *)strdesc, "fx2lafw", 7))
 164                         break;
 165
 166                 /* If we made it here, it must be an fx2lafw. */
 167                 ret = TRUE;
 168         }
 169         if (hdl)
 170                 libusb_close(hdl);
 171
 172         return ret;
 173 }
 174
 175 static int fx2lafw_dev_open(int dev_index)
 176 {
 177         libusb_device **devlist;
 178         struct libusb_device_descriptor des;
 179         struct sr_dev_inst *sdi;
 180         struct context *ctx;
 181         struct version_info vi;
 182         int ret, skip, i;
 183         uint8_t revid;
 184
 185         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 186                 return SR_ERR;
 187         ctx = sdi->priv;
 188
 189         if (sdi->status == SR_ST_ACTIVE)
 190                 /* already in use */
 191                 return SR_ERR;
 192
 193         skip = 0;
 194         const int device_count = libusb_get_device_list(usb_context, &devlist);
 195         if (device_count < 0) {
 196                 sr_err("fx2lafw: Failed to retrieve device list (%d)",
 197                         device_count);
 198                 return SR_ERR;
 199         }
 200
 201         for (i = 0; i < device_count; i++) {
 202                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 203                         sr_err("fx2lafw: Failed to get device descriptor: %d.",
 204                                ret);
 205                         continue;
 206                 }
 207
 208                 if (des.idVendor != ctx->profile->vid
 209                     || des.idProduct != ctx->profile->pid)
 210                         continue;
 211
 212                 if (sdi->status == SR_ST_INITIALIZING) {
 213                         if (skip != dev_index) {
 214                                 /* Skip devices of this type that aren't the one we want. */
 215                                 skip += 1;
 216                                 continue;
 217                         }
 218                 } else if (sdi->status == SR_ST_INACTIVE) {
 219                         /*
 220                          * This device is fully enumerated, so we need to find
 221                          * this device by vendor, product, bus and address.
 222                          */
 223                         if (libusb_get_bus_number(devlist[i]) != ctx->usb->bus
 224                                 || libusb_get_device_address(devlist[i]) != ctx->usb->address)
 225                                 /* this is not the one */
 226                                 continue;
 227                 }
 228
 229                 if (!(ret = libusb_open(devlist[i], &ctx->usb->devhdl))) {
 230                         if (ctx->usb->address == 0xff)
 231                                 /*
 232                                  * first time we touch this device after firmware upload,
 233                                  * so we don't know the address yet.
 234                                  */
 235                                 ctx->usb->address = libusb_get_device_address(devlist[i]);
 236                 } else {
 237                         sr_err("fx2lafw: Failed to open device: %d.", ret);
 238                         break;
 239                 }
 240
 241                 ret = command_get_fw_version(ctx->usb->devhdl, &vi);
 242                 if (ret != SR_OK) {
 243                         sr_err("fx2lafw: Failed to retrieve "
 244                                "firmware version information.");
 245                         break;
 246                 }
 247
 248                 ret = command_get_revid_version(ctx->usb->devhdl, &revid);
 249                 if (ret != SR_OK) {
 250                         sr_err("fx2lafw: Failed to retrieve REVID.");
 251                         break;
 252                 }
 253
 254                 /*
 255                  * Changes in major version mean incompatible/API changes, so
 256                  * bail out if we encounter an incompatible version.
 257                  * Different minor versions are OK, they should be compatible.
 258                  */
 259                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 260                         sr_err("fx2lafw: Expected firmware version %d.x, "
 261                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 262                                vi.major, vi.minor);
 263                         break;
 264                 }
 265
 266                 sdi->status = SR_ST_ACTIVE;
 267                 sr_info("fx2lafw: Opened device %d on %d.%d "
 268                         "interface %d, firmware %d.%d, REVID %d.",
 269                         sdi->index, ctx->usb->bus, ctx->usb->address,
 270                         USB_INTERFACE, vi.major, vi.minor, revid);
 271
 272                 break;
 273         }
 274         libusb_free_device_list(devlist, 1);
 275
 276         if (sdi->status != SR_ST_ACTIVE)
 277                 return SR_ERR;
 278
 279         return SR_OK;
 280 }
 281
 282 static void close_dev(struct sr_dev_inst *sdi)
 283 {
 284         struct context *ctx;
 285
 286         ctx = sdi->priv;
 287
 288         if (ctx->usb->devhdl == NULL)
 289                 return;
 290
 291         sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
 292                 sdi->index, ctx->usb->bus, ctx->usb->address, USB_INTERFACE);
 293         libusb_release_interface(ctx->usb->devhdl, USB_INTERFACE);
 294         libusb_close(ctx->usb->devhdl);
 295         ctx->usb->devhdl = NULL;
 296         sdi->status = SR_ST_INACTIVE;
 297 }
 298
 299 static int configure_probes(struct context *ctx, GSList *probes)
 300 {
 301         struct sr_probe *probe;
 302         GSList *l;
 303         int probe_bit, stage, i;
 304         char *tc;
 305
 306         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 307                 ctx->trigger_mask[i] = 0;
 308                 ctx->trigger_value[i] = 0;
 309         }
 310
 311         stage = -1;
 312         for (l = probes; l; l = l->next) {
 313                 probe = (struct sr_probe *)l->data;
 314                 if (probe->enabled == FALSE)
 315                         continue;
 316                 probe_bit = 1 << (probe->index - 1);
 317                 if (!(probe->trigger))
 318                         continue;
 319
 320                 stage = 0;
 321                 for (tc = probe->trigger; *tc; tc++) {
 322                         ctx->trigger_mask[stage] |= probe_bit;
 323                         if (*tc == '1')
 324                                 ctx->trigger_value[stage] |= probe_bit;
 325                         stage++;
 326                         if (stage > NUM_TRIGGER_STAGES)
 327                                 return SR_ERR;
 328                 }
 329         }
 330
 331         if (stage == -1)
 332                 /*
 333                  * We didn't configure any triggers, make sure acquisition
 334                  * doesn't wait for any.
 335                  */
 336                 ctx->trigger_stage = TRIGGER_FIRED;
 337         else
 338                 ctx->trigger_stage = 0;
 339
 340         return SR_OK;
 341 }
 342
 343 static struct context *fx2lafw_dev_new(void)
 344 {
 345         struct context *ctx;
 346
 347         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 348                 sr_err("fx2lafw: %s: ctx malloc failed.", __func__);
 349                 return NULL;
 350         }
 351
 352         ctx->trigger_stage = TRIGGER_FIRED;
 353
 354         return ctx;
 355 }
 356
 357 /*
 358  * API callbacks
 359  */
 360
 361 static int hw_init(const char *devinfo)
 362 {
 363         struct sr_dev_inst *sdi;
 364         struct libusb_device_descriptor des;
 365         const struct fx2lafw_profile *prof;
 366         struct context *ctx;
 367         libusb_device **devlist;
 368         int ret;
 369         int devcnt = 0;
 370         int i, j;
 371
 372         /* Avoid compiler warnings. */
 373         (void)devinfo;
 374
 375         if (libusb_init(&usb_context) != 0) {
 376                 sr_warn("fx2lafw: Failed to initialize libusb.");
 377                 return 0;
 378         }
 379
 380         /* Find all fx2lafw compatible devices and upload firmware to them. */
 381         libusb_get_device_list(usb_context, &devlist);
 382         for (i = 0; devlist[i]; i++) {
 383
 384                 if ((ret = libusb_get_device_descriptor(
 385                      devlist[i], &des)) != 0) {
 386                         sr_warn("fx2lafw: Failed to get device descriptor: %d.", ret);
 387                         continue;
 388                 }
 389
 390                 prof = NULL;
 391                 for (j = 0; supported_fx2[j].vid; j++) {
 392                         if (des.idVendor == supported_fx2[j].vid &&
 393                                 des.idProduct == supported_fx2[j].pid) {
 394                                 prof = &supported_fx2[j];
 395                         }
 396                 }
 397
 398                 /* Skip if the device was not found */
 399                 if (!prof)
 400                         continue;
 401
 402                 sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
 403                         prof->vendor, prof->model, prof->model_version);
 404                 if (!sdi)
 405                         return 0;
 406
 407                 ctx = fx2lafw_dev_new();
 408                 ctx->profile = prof;
 409                 sdi->priv = ctx;
 410                 dev_insts = g_slist_append(dev_insts, sdi);
 411
 412                 if (check_conf_profile(devlist[i])) {
 413                         /* Already has the firmware, so fix the new address. */
 414                         sr_dbg("fx2lafw: Found an fx2lafw device.");
 415                         sdi->status = SR_ST_INACTIVE;
 416                         ctx->usb = sr_usb_dev_inst_new
 417                             (libusb_get_bus_number(devlist[i]),
 418                              libusb_get_device_address(devlist[i]), NULL);
 419                 } else {
 420                         if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 421                                 prof->firmware) == SR_OK)
 422                                 /* Remember when the firmware on this device was updated */
 423                                 ctx->fw_updated = g_get_monotonic_time();
 424                         else
 425                                 sr_err("fx2lafw: Firmware upload failed for "
 426                                        "device %d.", devcnt);
 427                         ctx->usb = sr_usb_dev_inst_new
 428                                 (libusb_get_bus_number(devlist[i]), 0xff, NULL);
 429                 }
 430
 431                 devcnt++;
 432         }
 433         libusb_free_device_list(devlist, 1);
 434
 435         return devcnt;
 436 }
 437
 438 static int hw_dev_open(int dev_index)
 439 {
 440         struct sr_dev_inst *sdi;
 441         struct context *ctx;
 442         int ret;
 443         int64_t timediff_us, timediff_ms;
 444
 445         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 446                 return SR_ERR;
 447         ctx = sdi->priv;
 448
 449         /*
 450          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 451          * milliseconds for the FX2 to renumerate.
 452          */
 453         ret = 0;
 454
 455         if (ctx->fw_updated > 0) {
 456                 sr_info("fx2lafw: Waiting for device to reset.");
 457                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 458                 g_usleep(300 * 1000);
 459                 timediff_ms = 0;
 460                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 461                         if ((ret = fx2lafw_dev_open(dev_index)) == SR_OK)
 462                                 break;
 463                         g_usleep(100 * 1000);
 464
 465                         timediff_us = g_get_monotonic_time() - ctx->fw_updated;
 466                         timediff_ms = timediff_us / G_USEC_PER_SEC;
 467                         sr_spew("fx2lafw: timediff: %" PRIi64 " us.",
 468                                 timediff_us);
 469                 }
 470                 sr_info("fx2lafw: Device came back after %d ms.", timediff_ms);
 471         } else {
 472                 ret = fx2lafw_dev_open(dev_index);
 473         }
 474
 475         if (ret != SR_OK) {
 476                 sr_err("fx2lafw: Unable to open device.");
 477                 return SR_ERR;
 478         }
 479         ctx = sdi->priv;
 480
 481         ret = libusb_claim_interface(ctx->usb->devhdl, USB_INTERFACE);
 482         if (ret != 0) {
 483                 sr_err("fx2lafw: Unable to claim interface: %d.", ret);
 484                 return SR_ERR;
 485         }
 486
 487         if (ctx->cur_samplerate == 0) {
 488                 /* Samplerate hasn't been set; default to the slowest one. */
 489                 if (hw_dev_config_set(dev_index, SR_HWCAP_SAMPLERATE,
 490                     &supported_samplerates[0]) == SR_ERR)
 491                         return SR_ERR;
 492         }
 493
 494         return SR_OK;
 495 }
 496
 497 static int hw_dev_close(int dev_index)
 498 {
 499         struct sr_dev_inst *sdi;
 500
 501         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
 502                 sr_err("fx2lafw: %s: sdi was NULL.", __func__);
 503                 return SR_ERR_BUG;
 504         }
 505
 506         /* TODO */
 507         close_dev(sdi);
 508
 509         return SR_OK;
 510 }
 511
 512 static int hw_cleanup(void)
 513 {
 514         GSList *l;
 515         struct sr_dev_inst *sdi;
 516         struct context *ctx;
 517         int ret = SR_OK;
 518
 519         for (l = dev_insts; l; l = l->next) {
 520                 if (!(sdi = l->data)) {
 521                         /* Log error, but continue cleaning up the rest. */
 522                         sr_err("fx2lafw: %s: sdi was NULL, continuing.",
 523                                __func__);
 524                         ret = SR_ERR_BUG;
 525                         continue;
 526                 }
 527                 if (!(ctx = sdi->priv)) {
 528                         /* Log error, but continue cleaning up the rest. */
 529                         sr_err("fx2lafw: %s: sdi->priv was NULL, continuing",
 530                                __func__);
 531                         ret = SR_ERR_BUG;
 532                         continue;
 533                 }
 534                 close_dev(sdi);
 535                 sdi = l->data;
 536                 sr_dev_inst_free(sdi);
 537         }
 538
 539         g_slist_free(dev_insts);
 540         dev_insts = NULL;
 541
 542         if (usb_context)
 543                 libusb_exit(usb_context);
 544         usb_context = NULL;
 545
 546         return ret;
 547 }
 548
 549 static void *hw_dev_info_get(int dev_index, int dev_info_id)
 550 {
 551         struct sr_dev_inst *sdi;
 552         struct context *ctx;
 553
 554         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 555                 return NULL;
 556         ctx = sdi->priv;
 557
 558         switch (dev_info_id) {
 559         case SR_DI_INST:
 560                 return sdi;
 561         case SR_DI_NUM_PROBES:
 562                 return GINT_TO_POINTER(ctx->profile->num_probes);
 563         case SR_DI_PROBE_NAMES:
 564                 return probe_names;
 565         case SR_DI_SAMPLERATES:
 566                 return &samplerates;
 567         case SR_DI_TRIGGER_TYPES:
 568                 return TRIGGER_TYPES;
 569         case SR_DI_CUR_SAMPLERATE:
 570                 return &ctx->cur_samplerate;
 571         }
 572
 573         return NULL;
 574 }
 575
 576 static int hw_dev_status_get(int dev_index)
 577 {
 578         const struct sr_dev_inst *const sdi =
 579                 sr_dev_inst_get(dev_insts, dev_index);
 580
 581         if (!sdi)
 582                 return SR_ST_NOT_FOUND;
 583
 584         return sdi->status;
 585 }
 586
 587 static const int *hw_hwcap_get_all(void)
 588 {
 589         return hwcaps;
 590 }
 591
 592 static int hw_dev_config_set(int dev_index, int hwcap, void *value)
 593 {
 594         struct sr_dev_inst *sdi;
 595         struct context *ctx;
 596         int ret;
 597
 598         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 599                 return SR_ERR;
 600         ctx = sdi->priv;
 601
 602         if (hwcap == SR_HWCAP_SAMPLERATE) {
 603                 ctx->cur_samplerate = *(uint64_t *)value;
 604                 ret = SR_OK;
 605         } else if (hwcap == SR_HWCAP_PROBECONFIG) {
 606                 ret = configure_probes(ctx, (GSList *) value);
 607         } else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
 608                 ctx->limit_samples = *(uint64_t *)value;
 609                 ret = SR_OK;
 610         } else {
 611                 ret = SR_ERR;
 612         }
 613
 614         return ret;
 615 }
 616
 617 static int receive_data(int fd, int revents, void *cb_data)
 618 {
 619         struct timeval tv;
 620
 621         /* Avoid compiler warnings. */
 622         (void)fd;
 623         (void)revents;
 624         (void)cb_data;
 625
 626         tv.tv_sec = tv.tv_usec = 0;
 627         libusb_handle_events_timeout(usb_context, &tv);
 628
 629         return TRUE;
 630 }
 631
 632 static void abort_acquisition(struct context *ctx)
 633 {
 634         ctx->num_samples = -1;
 635 }
 636
 637 static void finish_acquisition(struct context *ctx)
 638 {
 639         struct sr_datafeed_packet packet;
 640         int i;
 641
 642         /* Terminate session */
 643         packet.type = SR_DF_END;
 644         sr_session_send(ctx->session_dev_id, &packet);
 645
 646         /* Remove fds from polling */
 647         const struct libusb_pollfd **const lupfd =
 648                 libusb_get_pollfds(usb_context);
 649         for (i = 0; lupfd[i]; i++)
 650                 sr_source_remove(lupfd[i]->fd);
 651         free(lupfd); /* NOT g_free()! */
 652 }
 653
 654 static void receive_transfer(struct libusb_transfer *transfer)
 655 {
 656         /* TODO: These statics have to move to the ctx struct. */
 657         static int empty_transfer_count = 0;
 658         struct sr_datafeed_packet packet;
 659         struct sr_datafeed_logic logic;
 660         struct context *ctx = transfer->user_data;
 661         int cur_buflen, trigger_offset, i;
 662         unsigned char *cur_buf, *new_buf;
 663
 664         /*
 665          * If acquisition has already ended, just free any queued up
 666          * transfer that come in.
 667          */
 668         if (ctx->num_samples == -1) {
 669                 if (transfer)
 670                         libusb_free_transfer(transfer);
 671
 672                 ctx->submitted_transfers--;
 673                 if (ctx->submitted_transfers == 0)
 674                         finish_acquisition(ctx);
 675
 676                 return;
 677         }
 678
 679         sr_info("fx2lafw: receive_transfer(): status %d received %d bytes.",
 680                 transfer->status, transfer->actual_length);
 681
 682         /* Save incoming transfer before reusing the transfer struct. */
 683         cur_buf = transfer->buffer;
 684         cur_buflen = transfer->actual_length;
 685
 686         /* Fire off a new request. */
 687         if (!(new_buf = g_try_malloc(4096))) {
 688                 sr_err("fx2lafw: %s: new_buf malloc failed.", __func__);
 689                 return; /* TODO: SR_ERR_MALLOC */
 690         }
 691
 692         transfer->buffer = new_buf;
 693         transfer->length = 4096;
 694         if (libusb_submit_transfer(transfer) != 0) {
 695                 /* TODO: Stop session? */
 696                 /* TODO: Better error message. */
 697                 sr_err("fx2lafw: %s: libusb_submit_transfer error.", __func__);
 698         }
 699
 700         if (cur_buflen == 0) {
 701                 empty_transfer_count++;
 702                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 703                         /*
 704                          * The FX2 gave up. End the acquisition, the frontend
 705                          * will work out that the samplecount is short.
 706                          */
 707                         abort_acquisition(ctx);
 708                 }
 709                 return;
 710         } else {
 711                 empty_transfer_count = 0;
 712         }
 713
 714         trigger_offset = 0;
 715         if (ctx->trigger_stage >= 0) {
 716                 for (i = 0; i < cur_buflen; i++) {
 717
 718                         if ((cur_buf[i] & ctx->trigger_mask[ctx->trigger_stage]) == ctx->trigger_value[ctx->trigger_stage]) {
 719                                 /* Match on this trigger stage. */
 720                                 ctx->trigger_buffer[ctx->trigger_stage] = cur_buf[i];
 721                                 ctx->trigger_stage++;
 722
 723                                 if (ctx->trigger_stage == NUM_TRIGGER_STAGES || ctx->trigger_mask[ctx->trigger_stage] == 0) {
 724                                         /* Match on all trigger stages, we're done. */
 725                                         trigger_offset = i + 1;
 726
 727                                         /*
 728                                          * TODO: Send pre-trigger buffer to session bus.
 729                                          * Tell the frontend we hit the trigger here.
 730                                          */
 731                                         packet.type = SR_DF_TRIGGER;
 732                                         packet.payload = NULL;
 733                                         sr_session_send(ctx->session_dev_id, &packet);
 734
 735                                         /*
 736                                          * Send the samples that triggered it, since we're
 737                                          * skipping past them.
 738                                          */
 739                                         packet.type = SR_DF_LOGIC;
 740                                         packet.payload = &logic;
 741                                         logic.length = ctx->trigger_stage;
 742                                         logic.unitsize = 1;
 743                                         logic.data = ctx->trigger_buffer;
 744                                         sr_session_send(ctx->session_dev_id, &packet);
 745
 746                                         ctx->trigger_stage = TRIGGER_FIRED;
 747                                         break;
 748                                 }
 749                                 return;
 750                         }
 751
 752                         /*
 753                          * We had a match before, but not in the next sample. However, we may
 754                          * have a match on this stage in the next bit -- trigger on 0001 will
 755                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 756                          * the next sample from the one that matched originally, which the
 757                          * counter increment at the end of the loop takes care of.
 758                          */
 759                         if (ctx->trigger_stage > 0) {
 760                                 i -= ctx->trigger_stage;
 761                                 if (i < -1)
 762                                         i = -1; /* Oops, went back past this buffer. */
 763                                 /* Reset trigger stage. */
 764                                 ctx->trigger_stage = 0;
 765                         }
 766                 }
 767         }
 768
 769         if (ctx->trigger_stage == TRIGGER_FIRED) {
 770                 /* Send the incoming transfer to the session bus. */
 771                 packet.type = SR_DF_LOGIC;
 772                 packet.payload = &logic;
 773                 logic.length = cur_buflen - trigger_offset;
 774                 logic.unitsize = 1;
 775                 logic.data = cur_buf + trigger_offset;
 776                 sr_session_send(ctx->session_dev_id, &packet);
 777                 g_free(cur_buf);
 778
 779                 ctx->num_samples += cur_buflen;
 780                 if (ctx->limit_samples &&
 781                         (unsigned int)ctx->num_samples > ctx->limit_samples) {
 782                         abort_acquisition(ctx);
 783                 }
 784         } else {
 785                 /*
 786                  * TODO: Buffer pre-trigger data in capture
 787                  * ratio-sized buffer.
 788                  */
 789         }
 790 }
 791
 792 static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 793 {
 794         struct sr_dev_inst *sdi;
 795         struct sr_datafeed_packet *packet;
 796         struct sr_datafeed_header *header;
 797         struct sr_datafeed_meta_logic meta;
 798         struct context *ctx;
 799         struct libusb_transfer *transfer;
 800         const struct libusb_pollfd **lupfd;
 801         int ret, size, i;
 802         unsigned char *buf;
 803
 804         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 805                 return SR_ERR;
 806         ctx = sdi->priv;
 807         ctx->session_dev_id = cb_data;
 808         ctx->num_samples = 0;
 809
 810         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 811                 sr_err("fx2lafw: %s: packet malloc failed.", __func__);
 812                 return SR_ERR_MALLOC;
 813         }
 814
 815         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 816                 sr_err("fx2lafw: %s: header malloc failed.", __func__);
 817                 return SR_ERR_MALLOC;
 818         }
 819
 820         /* Start with 2K transfer, subsequently increased to 4K. */
 821         size = 2048;
 822         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 823                 if (!(buf = g_try_malloc(size))) {
 824                         sr_err("fx2lafw: %s: buf malloc failed.", __func__);
 825                         return SR_ERR_MALLOC;
 826                 }
 827                 transfer = libusb_alloc_transfer(0);
 828                 libusb_fill_bulk_transfer(transfer, ctx->usb->devhdl,
 829                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 830                                 receive_transfer, ctx, 40);
 831                 if (libusb_submit_transfer(transfer) != 0) {
 832                         /* TODO: Free them all. */
 833                         libusb_free_transfer(transfer);
 834                         g_free(buf);
 835                         return SR_ERR;
 836                 }
 837
 838                 ctx->submitted_transfers++;
 839                 size = 4096;
 840         }
 841
 842         lupfd = libusb_get_pollfds(usb_context);
 843         for (i = 0; lupfd[i]; i++)
 844                 sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 845                               40, receive_data, NULL);
 846         free(lupfd); /* NOT g_free()! */
 847
 848         packet->type = SR_DF_HEADER;
 849         packet->payload = header;
 850         header->feed_version = 1;
 851         gettimeofday(&header->starttime, NULL);
 852         sr_session_send(cb_data, packet);
 853
 854         /* Send metadata about the SR_DF_LOGIC packets to come. */
 855         packet->type = SR_DF_META_LOGIC;
 856         packet->payload = &meta;
 857         meta.samplerate = ctx->cur_samplerate;
 858         meta.num_probes = ctx->profile->num_probes;
 859         sr_session_send(cb_data, packet);
 860
 861         g_free(header);
 862         g_free(packet);
 863
 864         if ((ret = command_start_acquisition (ctx->usb->devhdl,
 865                 ctx->cur_samplerate)) != SR_OK) {
 866                 return ret;
 867         }
 868
 869         return SR_OK;
 870 }
 871
 872 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
 873 static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
 874 {
 875         struct sr_dev_inst *sdi;
 876
 877         /* Avoid compiler warnings. */
 878         (void)cb_data;
 879
 880         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
 881                 return SR_ERR;
 882
 883         abort_acquisition(sdi->priv);
 884
 885         return SR_OK;
 886 }
 887
 888 SR_PRIV struct sr_dev_driver fx2lafw_driver_info = {
 889         .name = "fx2lafw",
 890         .longname = "fx2lafw (generic driver for FX2 based LAs)",
 891         .api_version = 1,
 892         .init = hw_init,
 893         .cleanup = hw_cleanup,
 894         .dev_open = hw_dev_open,
 895         .dev_close = hw_dev_close,
 896         .dev_info_get = hw_dev_info_get,
 897         .dev_status_get = hw_dev_status_get,
 898         .hwcap_get_all = hw_hwcap_get_all,
 899         .dev_config_set = hw_dev_config_set,
 900         .dev_acquisition_start = hw_dev_acquisition_start,
 901         .dev_acquisition_stop = hw_dev_acquisition_stop,
 902 };