src/hardware/fx2lafw/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 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 <config.h>
  22 #include <glib.h>
  23 #include <glib/gstdio.h>
  24 #include "protocol.h"
  25
  26 #pragma pack(push, 1)
  27
  28 struct version_info {
  29         uint8_t major;
  30         uint8_t minor;
  31 };
  32
  33 struct cmd_start_acquisition {
  34         uint8_t flags;
  35         uint8_t sample_delay_h;
  36         uint8_t sample_delay_l;
  37 };
  38
  39 #pragma pack(pop)
  40
  41 #define USB_TIMEOUT 100
  42
  43 static int command_get_fw_version(libusb_device_handle *devhdl,
  44                                   struct version_info *vi)
  45 {
  46         int ret;
  47
  48         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  49                 LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
  50                 (unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);
  51
  52         if (ret < 0) {
  53                 sr_err("Unable to get version info: %s.",
  54                        libusb_error_name(ret));
  55                 return SR_ERR;
  56         }
  57
  58         return SR_OK;
  59 }
  60
  61 static int command_get_revid_version(struct sr_dev_inst *sdi, uint8_t *revid)
  62 {
  63         struct sr_usb_dev_inst *usb = sdi->conn;
  64         libusb_device_handle *devhdl = usb->devhdl;
  65         int ret;
  66
  67         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  68                 LIBUSB_ENDPOINT_IN, CMD_GET_REVID_VERSION, 0x0000, 0x0000,
  69                 revid, 1, USB_TIMEOUT);
  70
  71         if (ret < 0) {
  72                 sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
  73                 return SR_ERR;
  74         }
  75
  76         return SR_OK;
  77 }
  78
  79 static int command_start_acquisition(const struct sr_dev_inst *sdi)
  80 {
  81         struct dev_context *devc;
  82         struct sr_usb_dev_inst *usb;
  83         uint64_t samplerate;
  84         struct cmd_start_acquisition cmd;
  85         int delay, ret;
  86
  87         devc = sdi->priv;
  88         usb = sdi->conn;
  89         samplerate = devc->cur_samplerate;
  90
  91         /* Compute the sample rate. */
  92         if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) {
  93                 sr_err("Unable to sample at %" PRIu64 "Hz "
  94                        "when collecting 16-bit samples.", samplerate);
  95                 return SR_ERR;
  96         }
  97
  98         delay = 0;
  99         cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0;
 100         if ((SR_MHZ(48) % samplerate) == 0) {
 101                 cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
 102                 delay = SR_MHZ(48) / samplerate - 1;
 103                 if (delay > MAX_SAMPLE_DELAY)
 104                         delay = 0;
 105         }
 106
 107         if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
 108                 cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
 109                 delay = SR_MHZ(30) / samplerate - 1;
 110         }
 111
 112         sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay,
 113                 (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
 114
 115         if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
 116                 sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
 117                 return SR_ERR;
 118         }
 119
 120         cmd.sample_delay_h = (delay >> 8) & 0xff;
 121         cmd.sample_delay_l = delay & 0xff;
 122
 123         /* Select the sampling width. */
 124         cmd.flags |= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT :
 125                 CMD_START_FLAGS_SAMPLE_8BIT;
 126         /* Enable CTL2 clock. */
 127         cmd.flags |= (g_slist_length(devc->enabled_analog_channels) > 0) ? CMD_START_FLAGS_CLK_CTL2 : 0;
 128
 129         /* Send the control message. */
 130         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 131                         LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
 132                         (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
 133         if (ret < 0) {
 134                 sr_err("Unable to send start command: %s.",
 135                        libusb_error_name(ret));
 136                 return SR_ERR;
 137         }
 138
 139         return SR_OK;
 140 }
 141
 142 SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 143 {
 144         libusb_device **devlist;
 145         struct sr_usb_dev_inst *usb;
 146         struct libusb_device_descriptor des;
 147         struct dev_context *devc;
 148         struct drv_context *drvc;
 149         struct version_info vi;
 150         int ret, i, device_count;
 151         uint8_t revid;
 152         char connection_id[64];
 153
 154         drvc = di->context;
 155         devc = sdi->priv;
 156         usb = sdi->conn;
 157
 158         if (sdi->status == SR_ST_ACTIVE)
 159                 /* Device is already in use. */
 160                 return SR_ERR;
 161
 162         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 163         if (device_count < 0) {
 164                 sr_err("Failed to get device list: %s.",
 165                        libusb_error_name(device_count));
 166                 return SR_ERR;
 167         }
 168
 169         for (i = 0; i < device_count; i++) {
 170                 libusb_get_device_descriptor(devlist[i], &des);
 171
 172                 if (des.idVendor != devc->profile->vid
 173                     || des.idProduct != devc->profile->pid)
 174                         continue;
 175
 176                 if ((sdi->status == SR_ST_INITIALIZING) ||
 177                                 (sdi->status == SR_ST_INACTIVE)) {
 178                         /*
 179                          * Check device by its physical USB bus/port address.
 180                          */
 181                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 182                         if (strcmp(sdi->connection_id, connection_id))
 183                                 /* This is not the one. */
 184                                 continue;
 185                 }
 186
 187                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 188                         if (usb->address == 0xff)
 189                                 /*
 190                                  * First time we touch this device after FW
 191                                  * upload, so we don't know the address yet.
 192                                  */
 193                                 usb->address = libusb_get_device_address(devlist[i]);
 194                 } else {
 195                         sr_err("Failed to open device: %s.",
 196                                libusb_error_name(ret));
 197                         break;
 198                 }
 199
 200                 if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
 201                         if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
 202                                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
 203                                         sr_err("Failed to detach kernel driver: %s.",
 204                                                 libusb_error_name(ret));
 205                                         return SR_ERR;
 206                                 }
 207                         }
 208                 }
 209
 210                 ret = command_get_fw_version(usb->devhdl, &vi);
 211                 if (ret != SR_OK) {
 212                         sr_err("Failed to get firmware version.");
 213                         break;
 214                 }
 215
 216                 ret = command_get_revid_version(sdi, &revid);
 217                 if (ret != SR_OK) {
 218                         sr_err("Failed to get REVID.");
 219                         break;
 220                 }
 221
 222                 /*
 223                  * Changes in major version mean incompatible/API changes, so
 224                  * bail out if we encounter an incompatible version.
 225                  * Different minor versions are OK, they should be compatible.
 226                  */
 227                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 228                         sr_err("Expected firmware version %d.x, "
 229                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 230                                vi.major, vi.minor);
 231                         break;
 232                 }
 233
 234                 sdi->status = SR_ST_ACTIVE;
 235                 sr_info("Opened device on %d.%d (logical) / %s (physical), "
 236                         "interface %d, firmware %d.%d.",
 237                         usb->bus, usb->address, connection_id,
 238                         USB_INTERFACE, vi.major, vi.minor);
 239
 240                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 241                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 242
 243                 break;
 244         }
 245         libusb_free_device_list(devlist, 1);
 246
 247         if (sdi->status != SR_ST_ACTIVE)
 248                 return SR_ERR;
 249
 250         return SR_OK;
 251 }
 252
 253 SR_PRIV struct dev_context *fx2lafw_dev_new(void)
 254 {
 255         struct dev_context *devc;
 256
 257         devc = g_malloc0(sizeof(struct dev_context));
 258         devc->profile = NULL;
 259         devc->fw_updated = 0;
 260         devc->cur_samplerate = 0;
 261         devc->limit_samples = 0;
 262         devc->capture_ratio = 0;
 263         devc->sample_wide = FALSE;
 264         devc->stl = NULL;
 265
 266         return devc;
 267 }
 268
 269 SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
 270 {
 271         int i;
 272
 273         devc->acq_aborted = TRUE;
 274
 275         for (i = devc->num_transfers - 1; i >= 0; i--) {
 276                 if (devc->transfers[i])
 277                         libusb_cancel_transfer(devc->transfers[i]);
 278         }
 279 }
 280
 281 static void finish_acquisition(struct sr_dev_inst *sdi)
 282 {
 283         struct dev_context *devc;
 284
 285         devc = sdi->priv;
 286
 287         std_session_send_df_end(sdi);
 288
 289         usb_source_remove(sdi->session, devc->ctx);
 290
 291         devc->num_transfers = 0;
 292         g_free(devc->transfers);
 293
 294         /* Free the deinterlace buffers if we had them. */
 295         if (g_slist_length(devc->enabled_analog_channels) > 0) {
 296                 g_free(devc->logic_buffer);
 297                 g_free(devc->analog_buffer);
 298         }
 299
 300         if (devc->stl) {
 301                 soft_trigger_logic_free(devc->stl);
 302                 devc->stl = NULL;
 303         }
 304 }
 305
 306 static void free_transfer(struct libusb_transfer *transfer)
 307 {
 308         struct sr_dev_inst *sdi;
 309         struct dev_context *devc;
 310         unsigned int i;
 311
 312         sdi = transfer->user_data;
 313         devc = sdi->priv;
 314
 315         g_free(transfer->buffer);
 316         transfer->buffer = NULL;
 317         libusb_free_transfer(transfer);
 318
 319         for (i = 0; i < devc->num_transfers; i++) {
 320                 if (devc->transfers[i] == transfer) {
 321                         devc->transfers[i] = NULL;
 322                         break;
 323                 }
 324         }
 325
 326         devc->submitted_transfers--;
 327         if (devc->submitted_transfers == 0)
 328                 finish_acquisition(sdi);
 329 }
 330
 331 static void resubmit_transfer(struct libusb_transfer *transfer)
 332 {
 333         int ret;
 334
 335         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 336                 return;
 337
 338         sr_err("%s: %s", __func__, libusb_error_name(ret));
 339         free_transfer(transfer);
 340
 341 }
 342
 343 static void mso_send_data_proc(struct sr_dev_inst *sdi,
 344         uint8_t *data, size_t length, size_t sample_width)
 345 {
 346         size_t i;
 347         struct dev_context *devc;
 348         struct sr_datafeed_analog analog;
 349         struct sr_analog_encoding encoding;
 350         struct sr_analog_meaning meaning;
 351         struct sr_analog_spec spec;
 352
 353         (void)sample_width;
 354
 355         devc = sdi->priv;
 356
 357         length /= 2;
 358
 359         /* Send the logic */
 360         for (i = 0; i < length; i++) {
 361                 devc->logic_buffer[i] = data[i * 2];
 362                 /* Rescale to -10V - +10V from 0-255. */
 363                 devc->analog_buffer[i] = (data[i * 2 + 1] - 128.0f) / 12.8f;
 364         };
 365
 366         const struct sr_datafeed_logic logic = {
 367                 .length = length,
 368                 .unitsize = 1,
 369                 .data = devc->logic_buffer
 370         };
 371
 372         const struct sr_datafeed_packet logic_packet = {
 373                 .type = SR_DF_LOGIC,
 374                 .payload = &logic
 375         };
 376
 377         sr_session_send(sdi, &logic_packet);
 378
 379         sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
 380         analog.meaning->channels = devc->enabled_analog_channels;
 381         analog.meaning->mq = SR_MQ_VOLTAGE;
 382         analog.meaning->unit = SR_UNIT_VOLT;
 383         analog.meaning->mqflags = 0 /* SR_MQFLAG_DC */;
 384         analog.num_samples = length;
 385         analog.data = devc->analog_buffer;
 386
 387         const struct sr_datafeed_packet analog_packet = {
 388                 .type = SR_DF_ANALOG,
 389                 .payload = &analog
 390         };
 391
 392         sr_session_send(sdi, &analog_packet);
 393 }
 394
 395 static void la_send_data_proc(struct sr_dev_inst *sdi,
 396         uint8_t *data, size_t length, size_t sample_width)
 397 {
 398         const struct sr_datafeed_logic logic = {
 399                 .length = length,
 400                 .unitsize = sample_width,
 401                 .data = data
 402         };
 403
 404         const struct sr_datafeed_packet packet = {
 405                 .type = SR_DF_LOGIC,
 406                 .payload = &logic
 407         };
 408
 409         sr_session_send(sdi, &packet);
 410 }
 411
 412 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 413 {
 414         struct sr_dev_inst *sdi;
 415         struct dev_context *devc;
 416         gboolean packet_has_error = FALSE;
 417         unsigned int num_samples;
 418         int trigger_offset, cur_sample_count, unitsize;
 419         int pre_trigger_samples;
 420
 421         sdi = transfer->user_data;
 422         devc = sdi->priv;
 423
 424         /*
 425          * If acquisition has already ended, just free any queued up
 426          * transfer that come in.
 427          */
 428         if (devc->acq_aborted) {
 429                 free_transfer(transfer);
 430                 return;
 431         }
 432
 433         sr_dbg("receive_transfer(): status %s received %d bytes.",
 434                 libusb_error_name(transfer->status), transfer->actual_length);
 435
 436         /* Save incoming transfer before reusing the transfer struct. */
 437         unitsize = devc->sample_wide ? 2 : 1;
 438         cur_sample_count = transfer->actual_length / unitsize;
 439
 440         switch (transfer->status) {
 441         case LIBUSB_TRANSFER_NO_DEVICE:
 442                 fx2lafw_abort_acquisition(devc);
 443                 free_transfer(transfer);
 444                 return;
 445         case LIBUSB_TRANSFER_COMPLETED:
 446         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 447                 break;
 448         default:
 449                 packet_has_error = TRUE;
 450                 break;
 451         }
 452
 453         if (transfer->actual_length == 0 || packet_has_error) {
 454                 devc->empty_transfer_count++;
 455                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 456                         /*
 457                          * The FX2 gave up. End the acquisition, the frontend
 458                          * will work out that the samplecount is short.
 459                          */
 460                         fx2lafw_abort_acquisition(devc);
 461                         free_transfer(transfer);
 462                 } else {
 463                         resubmit_transfer(transfer);
 464                 }
 465                 return;
 466         } else {
 467                 devc->empty_transfer_count = 0;
 468         }
 469         if (devc->trigger_fired) {
 470                 if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
 471                         /* Send the incoming transfer to the session bus. */
 472                         if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
 473                                 num_samples = devc->limit_samples - devc->sent_samples;
 474                         else
 475                                 num_samples = cur_sample_count;
 476
 477                         devc->send_data_proc(sdi, (uint8_t *)transfer->buffer,
 478                                 num_samples * unitsize, unitsize);
 479                         devc->sent_samples += num_samples;
 480                 }
 481         } else {
 482                 trigger_offset = soft_trigger_logic_check(devc->stl,
 483                         transfer->buffer, transfer->actual_length, &pre_trigger_samples);
 484                 if (trigger_offset > -1) {
 485                         devc->sent_samples += pre_trigger_samples;
 486                         num_samples = cur_sample_count - trigger_offset;
 487                         if (devc->limit_samples &&
 488                                         num_samples > devc->limit_samples - devc->sent_samples)
 489                                 num_samples = devc->limit_samples - devc->sent_samples;
 490
 491                         devc->send_data_proc(sdi, (uint8_t *)transfer->buffer
 492                                         + trigger_offset * unitsize,
 493                                         num_samples * unitsize, unitsize);
 494                         devc->sent_samples += num_samples;
 495
 496                         devc->trigger_fired = TRUE;
 497                 }
 498         }
 499
 500         if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
 501                 fx2lafw_abort_acquisition(devc);
 502                 free_transfer(transfer);
 503         } else
 504                 resubmit_transfer(transfer);
 505 }
 506
 507 static int configure_channels(const struct sr_dev_inst *sdi)
 508 {
 509         struct dev_context *devc;
 510         const GSList *l;
 511         int p;
 512         struct sr_channel *ch;
 513         uint32_t channel_mask = 0, num_analog = 0;
 514
 515         devc = sdi->priv;
 516
 517         g_slist_free(devc->enabled_analog_channels);
 518         devc->enabled_analog_channels = NULL;
 519
 520         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 521                 ch = l->data;
 522                 if ((p <= NUM_CHANNELS) && (ch->type == SR_CHANNEL_ANALOG)
 523                                 && (ch->enabled)) {
 524                         num_analog++;
 525                         devc->enabled_analog_channels =
 526                             g_slist_append(devc->enabled_analog_channels, ch);
 527                 } else {
 528                         channel_mask |= ch->enabled << p;
 529                 }
 530         }
 531
 532         /*
 533          * Use wide sampling if either any of the LA channels 8..15 is enabled,
 534          * and/or at least one analog channel is enabled.
 535          */
 536         devc->sample_wide = channel_mask > 0xff || num_analog > 0;
 537
 538         return SR_OK;
 539 }
 540
 541 static unsigned int to_bytes_per_ms(unsigned int samplerate)
 542 {
 543         return samplerate / 1000;
 544 }
 545
 546 static size_t get_buffer_size(struct dev_context *devc)
 547 {
 548         size_t s;
 549
 550         /*
 551          * The buffer should be large enough to hold 10ms of data and
 552          * a multiple of 512.
 553          */
 554         s = 10 * to_bytes_per_ms(devc->cur_samplerate);
 555         return (s + 511) & ~511;
 556 }
 557
 558 static unsigned int get_number_of_transfers(struct dev_context *devc)
 559 {
 560         unsigned int n;
 561
 562         /* Total buffer size should be able to hold about 500ms of data. */
 563         n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
 564                 get_buffer_size(devc));
 565
 566         if (n > NUM_SIMUL_TRANSFERS)
 567                 return NUM_SIMUL_TRANSFERS;
 568
 569         return n;
 570 }
 571
 572 static unsigned int get_timeout(struct dev_context *devc)
 573 {
 574         size_t total_size;
 575         unsigned int timeout;
 576
 577         total_size = get_buffer_size(devc) *
 578                         get_number_of_transfers(devc);
 579         timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
 580         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 581 }
 582
 583 static int receive_data(int fd, int revents, void *cb_data)
 584 {
 585         struct timeval tv;
 586         struct drv_context *drvc;
 587
 588         (void)fd;
 589         (void)revents;
 590
 591         drvc = (struct drv_context *)cb_data;
 592
 593         tv.tv_sec = tv.tv_usec = 0;
 594         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 595
 596         return TRUE;
 597 }
 598
 599 static int start_transfers(const struct sr_dev_inst *sdi)
 600 {
 601         struct dev_context *devc;
 602         struct sr_usb_dev_inst *usb;
 603         struct sr_trigger *trigger;
 604         struct libusb_transfer *transfer;
 605         unsigned int i, num_transfers;
 606         int timeout, ret;
 607         unsigned char *buf;
 608         size_t size;
 609
 610         devc = sdi->priv;
 611         usb = sdi->conn;
 612
 613         devc->sent_samples = 0;
 614         devc->acq_aborted = FALSE;
 615         devc->empty_transfer_count = 0;
 616
 617         if ((trigger = sr_session_trigger_get(sdi->session))) {
 618                 int pre_trigger_samples = 0;
 619                 if (devc->limit_samples > 0)
 620                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 621                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 622                 if (!devc->stl)
 623                         return SR_ERR_MALLOC;
 624                 devc->trigger_fired = FALSE;
 625         } else
 626                 devc->trigger_fired = TRUE;
 627
 628         num_transfers = get_number_of_transfers(devc);
 629
 630         size = get_buffer_size(devc);
 631         devc->submitted_transfers = 0;
 632
 633         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 634         if (!devc->transfers) {
 635                 sr_err("USB transfers malloc failed.");
 636                 return SR_ERR_MALLOC;
 637         }
 638
 639         timeout = get_timeout(devc);
 640         devc->num_transfers = num_transfers;
 641         for (i = 0; i < num_transfers; i++) {
 642                 if (!(buf = g_try_malloc(size))) {
 643                         sr_err("USB transfer buffer malloc failed.");
 644                         return SR_ERR_MALLOC;
 645                 }
 646                 transfer = libusb_alloc_transfer(0);
 647                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
 648                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 649                                 receive_transfer, (void *)sdi, timeout);
 650                 sr_info("submitting transfer: %d", i);
 651                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
 652                         sr_err("Failed to submit transfer: %s.",
 653                                libusb_error_name(ret));
 654                         libusb_free_transfer(transfer);
 655                         g_free(buf);
 656                         fx2lafw_abort_acquisition(devc);
 657                         return SR_ERR;
 658                 }
 659                 devc->transfers[i] = transfer;
 660                 devc->submitted_transfers++;
 661         }
 662
 663         /*
 664          * If this device has analog channels and at least one of them is
 665          * enabled, use mso_send_data_proc() to properly handle the analog
 666          * data. Otherwise use la_send_data_proc().
 667          */
 668         if (g_slist_length(devc->enabled_analog_channels) > 0)
 669                 devc->send_data_proc = mso_send_data_proc;
 670         else
 671                 devc->send_data_proc = la_send_data_proc;
 672
 673         std_session_send_df_header(sdi);
 674
 675         return SR_OK;
 676 }
 677
 678 SR_PRIV int fx2lafw_start_acquisition(const struct sr_dev_inst *sdi)
 679 {
 680         struct sr_dev_driver *di;
 681         struct drv_context *drvc;
 682         struct dev_context *devc;
 683         int timeout, ret;
 684         size_t size;
 685
 686         di = sdi->driver;
 687         drvc = di->context;
 688         devc = sdi->priv;
 689
 690         devc->ctx = drvc->sr_ctx;
 691         devc->sent_samples = 0;
 692         devc->empty_transfer_count = 0;
 693         devc->acq_aborted = FALSE;
 694
 695         if (configure_channels(sdi) != SR_OK) {
 696                 sr_err("Failed to configure channels.");
 697                 return SR_ERR;
 698         }
 699
 700         timeout = get_timeout(devc);
 701         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, drvc);
 702
 703         size = get_buffer_size(devc);
 704         /* Prepare for analog sampling. */
 705         if (g_slist_length(devc->enabled_analog_channels) > 0) {
 706                 /* We need a buffer half the size of a transfer. */
 707                 devc->logic_buffer = g_try_malloc(size / 2);
 708                 devc->analog_buffer = g_try_malloc(
 709                         sizeof(float) * size / 2);
 710         }
 711         start_transfers(sdi);
 712         if ((ret = command_start_acquisition(sdi)) != SR_OK) {
 713                 fx2lafw_abort_acquisition(devc);
 714                 return ret;
 715         }
 716
 717         return SR_OK;
 718 }