hardware/saleae-logic/saleae-logic.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010 Bert Vermeulen <bert@biot.com>
   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 "config.h"
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/time.h>
  24 #include <inttypes.h>
  25 #include <glib.h>
  26 #include <libusb.h>
  27 #include <sigrok.h>
  28 #include <sigrok-internal.h>
  29
  30 #define USB_VENDOR                  0x0925
  31 #define USB_PRODUCT                     0x3881
  32 #define USB_VENDOR_NAME        "Saleae"
  33 #define USB_MODEL_NAME         "Logic"
  34 #define USB_MODEL_VERSION      ""
  35
  36 #define USB_INTERFACE          0
  37 #define USB_CONFIGURATION      1
  38 #define NUM_PROBES             8
  39 #define NUM_TRIGGER_STAGES     4
  40 #define TRIGGER_TYPES          "01"
  41 #define FIRMWARE               FIRMWARE_DIR "/saleae-logic.fw"
  42
  43 /* delay in ms */
  44 #define FIRMWARE_RENUM_DELAY   2000
  45 #define NUM_SIMUL_TRANSFERS    10
  46 #define MAX_EMPTY_TRANSFERS    (NUM_SIMUL_TRANSFERS * 2)
  47
  48 /* Software trigger implementation: positive values indicate trigger stage. */
  49 #define TRIGGER_FIRED          -1
  50
  51 /* There is only one model Saleae Logic, and this is what it supports: */
  52 static int capabilities[] = {
  53         SR_HWCAP_LOGIC_ANALYZER,
  54         SR_HWCAP_SAMPLERATE,
  55
  56         /* These are really implemented in the driver, not the hardware. */
  57         SR_HWCAP_LIMIT_SAMPLES,
  58         SR_HWCAP_CONTINUOUS,
  59         0,
  60 };
  61
  62 /* List of struct sr_device_instance, maintained by opendev()/closedev(). */
  63 static GSList *device_instances = NULL;
  64
  65 /*
  66  * Since we can't keep track of a Saleae Logic device after upgrading the
  67  * firmware -- it re-enumerates into a different device address after the
  68  * upgrade -- this is like a global lock. No device will open until a proper
  69  * delay after the last device was upgraded.
  70  */
  71 static GTimeVal firmware_updated = { 0, 0 };
  72
  73 static libusb_context *usb_context = NULL;
  74
  75 static uint64_t supported_samplerates[] = {
  76         SR_KHZ(200),
  77         SR_KHZ(250),
  78         SR_KHZ(500),
  79         SR_MHZ(1),
  80         SR_MHZ(2),
  81         SR_MHZ(4),
  82         SR_MHZ(8),
  83         SR_MHZ(12),
  84         SR_MHZ(16),
  85         SR_MHZ(24),
  86         0,
  87 };
  88
  89 static struct sr_samplerates samplerates = {
  90         SR_KHZ(200),
  91         SR_MHZ(24),
  92         SR_HZ(0),
  93         supported_samplerates,
  94 };
  95
  96 /* TODO: All of these should go in a device-specific struct. */
  97 static uint64_t cur_samplerate = 0;
  98 static uint64_t limit_samples = 0;
  99 static uint8_t probe_mask = 0;
 100 static uint8_t trigger_mask[NUM_TRIGGER_STAGES] = { 0 };
 101 static uint8_t trigger_value[NUM_TRIGGER_STAGES] = { 0 };
 102 static uint8_t trigger_buffer[NUM_TRIGGER_STAGES] = { 0 };
 103
 104 static int trigger_stage = TRIGGER_FIRED;
 105
 106 static int hw_set_configuration(int device_index, int capability, void *value);
 107 static void hw_stop_acquisition(int device_index, gpointer session_device_id);
 108
 109 /**
 110  * Check the USB configuration to determine if this is a Saleae Logic.
 111  *
 112  * @return 1 if the device's configuration profile match the Logic firmware's
 113  *         configuration, 0 otherwise.
 114  */
 115 static int check_conf_profile(libusb_device *dev)
 116 {
 117         struct libusb_device_descriptor des;
 118         struct libusb_config_descriptor *conf_dsc = NULL;
 119         const struct libusb_interface_descriptor *intf_dsc;
 120         int ret = -1;
 121
 122         while (ret == -1) {
 123                 /* Assume it's not a Saleae Logic unless proven wrong. */
 124                 ret = 0;
 125
 126                 if (libusb_get_device_descriptor(dev, &des) != 0)
 127                         break;
 128
 129                 if (des.bNumConfigurations != 1)
 130                         /* Need exactly 1 configuration. */
 131                         break;
 132
 133                 if (libusb_get_config_descriptor(dev, 0, &conf_dsc) != 0)
 134                         break;
 135
 136                 if (conf_dsc->bNumInterfaces != 1)
 137                         /* Need exactly 1 interface. */
 138                         break;
 139
 140                 if (conf_dsc->interface[0].num_altsetting != 1)
 141                         /* Need just one alternate setting. */
 142                         break;
 143
 144                 intf_dsc = &(conf_dsc->interface[0].altsetting[0]);
 145                 if (intf_dsc->bNumEndpoints != 2)
 146                         /* Need 2 endpoints. */
 147                         break;
 148
 149                 if ((intf_dsc->endpoint[0].bEndpointAddress & 0x8f) !=
 150                     (1 | LIBUSB_ENDPOINT_OUT))
 151                         /* First endpoint should be 1 (outbound). */
 152                         break;
 153
 154                 if ((intf_dsc->endpoint[1].bEndpointAddress & 0x8f) !=
 155                     (2 | LIBUSB_ENDPOINT_IN))
 156                         /* First endpoint should be 2 (inbound). */
 157                         break;
 158
 159                 /* If we made it here, it must be a Saleae Logic. */
 160                 ret = 1;
 161         }
 162
 163         if (conf_dsc)
 164                 libusb_free_config_descriptor(conf_dsc);
 165
 166         return ret;
 167 }
 168
 169 static struct sr_device_instance *sl_open_device(int device_index)
 170 {
 171         struct sr_device_instance *sdi;
 172         libusb_device **devlist;
 173         struct libusb_device_descriptor des;
 174         int err, skip, i;
 175
 176         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 177                 return NULL;
 178
 179         libusb_get_device_list(usb_context, &devlist);
 180         if (sdi->status == SR_ST_INITIALIZING) {
 181                 /*
 182                  * This device was renumerating last time we touched it.
 183                  * opendev() guarantees we've waited long enough for it to
 184                  * have booted properly, so now we need to find it on
 185                  * the bus and record its new address.
 186                  */
 187                 skip = 0;
 188                 for (i = 0; devlist[i]; i++) {
 189                         /* TODO: Error handling. */
 190                         err = opendev2(device_index, &sdi, devlist[i], &des,
 191                                        &skip, USB_VENDOR, USB_PRODUCT,
 192                                        USB_INTERFACE);
 193                 }
 194         } else if (sdi->status == SR_ST_INACTIVE) {
 195                 /*
 196                  * This device is fully enumerated, so we need to find this
 197                  * device by vendor, product, bus and address.
 198                  */
 199                 libusb_get_device_list(usb_context, &devlist);
 200                 for (i = 0; devlist[i]; i++) {
 201                         /* TODO: Error handling. */
 202                         err = opendev3(&sdi, devlist[i], &des, USB_VENDOR,
 203                                        USB_PRODUCT, USB_INTERFACE);
 204                 }
 205         } else {
 206                 /* Status must be SR_ST_ACTIVE, i.e. already in use... */
 207                 sdi = NULL;
 208         }
 209         libusb_free_device_list(devlist, 1);
 210
 211         if (sdi && sdi->status != SR_ST_ACTIVE)
 212                 sdi = NULL;
 213
 214         return sdi;
 215 }
 216
 217 static int upload_firmware(libusb_device *dev)
 218 {
 219         int ret;
 220
 221         ret = ezusb_upload_firmware(dev, USB_CONFIGURATION, FIRMWARE);
 222         if (ret != 0)
 223                 return 1;
 224
 225         /* Remember when the last firmware update was done. */
 226         g_get_current_time(&firmware_updated);
 227
 228         return 0;
 229 }
 230
 231 static void close_device(struct sr_device_instance *sdi)
 232 {
 233         if (sdi->usb->devhdl == NULL)
 234                 return;
 235
 236         sr_info("saleae: closing device %d on %d.%d interface %d", sdi->index,
 237                 sdi->usb->bus, sdi->usb->address, USB_INTERFACE);
 238         libusb_release_interface(sdi->usb->devhdl, USB_INTERFACE);
 239         libusb_close(sdi->usb->devhdl);
 240         sdi->usb->devhdl = NULL;
 241         sdi->status = SR_ST_INACTIVE;
 242 }
 243
 244 static int configure_probes(GSList *probes)
 245 {
 246         struct sr_probe *probe;
 247         GSList *l;
 248         int probe_bit, stage, i;
 249         char *tc;
 250
 251         probe_mask = 0;
 252         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 253                 trigger_mask[i] = 0;
 254                 trigger_value[i] = 0;
 255         }
 256
 257         stage = -1;
 258         for (l = probes; l; l = l->next) {
 259                 probe = (struct sr_probe *)l->data;
 260                 if (probe->enabled == FALSE)
 261                         continue;
 262                 probe_bit = 1 << (probe->index - 1);
 263                 probe_mask |= probe_bit;
 264                 if (!(probe->trigger))
 265                         continue;
 266
 267                 stage = 0;
 268                 for (tc = probe->trigger; *tc; tc++) {
 269                         trigger_mask[stage] |= probe_bit;
 270                         if (*tc == '1')
 271                                 trigger_value[stage] |= probe_bit;
 272                         stage++;
 273                         if (stage > NUM_TRIGGER_STAGES)
 274                                 return SR_ERR;
 275                 }
 276         }
 277
 278         if (stage == -1)
 279                 /*
 280                  * We didn't configure any triggers, make sure acquisition
 281                  * doesn't wait for any.
 282                  */
 283                 trigger_stage = TRIGGER_FIRED;
 284         else
 285                 trigger_stage = 0;
 286
 287         return SR_OK;
 288 }
 289
 290 /*
 291  * API callbacks
 292  */
 293
 294 static int hw_init(const char *deviceinfo)
 295 {
 296         struct sr_device_instance *sdi;
 297         struct libusb_device_descriptor des;
 298         libusb_device **devlist;
 299         int err, devcnt, i;
 300
 301         /* Avoid compiler warnings. */
 302         deviceinfo = deviceinfo;
 303
 304         if (libusb_init(&usb_context) != 0) {
 305                 sr_warn("Failed to initialize USB.");
 306                 return 0;
 307         }
 308
 309         /* Find all Saleae Logic devices and upload firmware to all of them. */
 310         devcnt = 0;
 311         libusb_get_device_list(usb_context, &devlist);
 312         for (i = 0; devlist[i]; i++) {
 313                 err = libusb_get_device_descriptor(devlist[i], &des);
 314                 if (err != 0) {
 315                         sr_warn("failed to get device descriptor: %d", err);
 316                         continue;
 317                 }
 318
 319                 if (des.idVendor != USB_VENDOR || des.idProduct != USB_PRODUCT)
 320                         continue; /* Not a Saleae Logic... */
 321
 322                 sdi = sr_device_instance_new(devcnt, SR_ST_INITIALIZING,
 323                         USB_VENDOR_NAME, USB_MODEL_NAME, USB_MODEL_VERSION);
 324                 if (!sdi)
 325                         return 0;
 326                 device_instances = g_slist_append(device_instances, sdi);
 327
 328                 if (check_conf_profile(devlist[i]) == 0) {
 329                         /*
 330                          * Continue on the off chance that the device is in a
 331                          * working state. TODO: Could maybe try a USB reset,
 332                          * or uploading the firmware again.
 333                          */
 334                         if (upload_firmware(devlist[i]) > 0)
 335                                 sr_warn("firmware upload failed for device %d",
 336                                         devcnt);
 337
 338                         sdi->usb = sr_usb_device_instance_new
 339                                 (libusb_get_bus_number(devlist[i]), 0, NULL);
 340                 } else {
 341                         /* Already has the firmware, so fix the new address. */
 342                         sdi->usb = sr_usb_device_instance_new
 343                             (libusb_get_bus_number(devlist[i]),
 344                              libusb_get_device_address(devlist[i]), NULL);
 345                 }
 346                 devcnt++;
 347         }
 348         libusb_free_device_list(devlist, 1);
 349
 350         return devcnt;
 351 }
 352
 353 static int hw_opendev(int device_index)
 354 {
 355         GTimeVal cur_time;
 356         struct sr_device_instance *sdi;
 357         int timediff, err;
 358         unsigned int cur, upd;
 359
 360         if (firmware_updated.tv_sec > 0) {
 361                 /* Firmware was recently uploaded. */
 362                 g_get_current_time(&cur_time);
 363                 cur = cur_time.tv_sec * 1000 + cur_time.tv_usec / 1000;
 364                 upd = firmware_updated.tv_sec * 1000 +
 365                       firmware_updated.tv_usec / 1000;
 366                 timediff = cur - upd;
 367                 if (timediff < FIRMWARE_RENUM_DELAY) {
 368                         timediff = FIRMWARE_RENUM_DELAY - timediff;
 369                         sr_info("saleae: waiting %d ms for device to reset",
 370                                 timediff);
 371                         g_usleep(timediff * 1000);
 372                         firmware_updated.tv_sec = 0;
 373                 }
 374         }
 375
 376         if (!(sdi = sl_open_device(device_index))) {
 377                 sr_warn("unable to open device");
 378                 return SR_ERR;
 379         }
 380
 381         err = libusb_claim_interface(sdi->usb->devhdl, USB_INTERFACE);
 382         if (err != 0) {
 383                 sr_warn("Unable to claim interface: %d", err);
 384                 return SR_ERR;
 385         }
 386
 387         if (cur_samplerate == 0) {
 388                 /* Samplerate hasn't been set; default to the slowest one. */
 389                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 390                     &supported_samplerates[0]) == SR_ERR)
 391                         return SR_ERR;
 392         }
 393
 394         return SR_OK;
 395 }
 396
 397 static int hw_closedev(int device_index)
 398 {
 399         struct sr_device_instance *sdi;
 400
 401         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 402                 sr_err("logic: %s: sdi was NULL", __func__);
 403                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 404         }
 405
 406         /* TODO */
 407         close_device(sdi);
 408
 409         return SR_OK;
 410 }
 411
 412 static void hw_cleanup(void)
 413 {
 414         GSList *l;
 415
 416         /* Properly close all devices... */
 417         for (l = device_instances; l; l = l->next)
 418                 close_device((struct sr_device_instance *)l->data);
 419
 420         /* ...and free all their memory. */
 421         for (l = device_instances; l; l = l->next)
 422                 g_free(l->data);
 423         g_slist_free(device_instances);
 424         device_instances = NULL;
 425
 426         if (usb_context)
 427                 libusb_exit(usb_context);
 428         usb_context = NULL;
 429 }
 430
 431 static void *hw_get_device_info(int device_index, int device_info_id)
 432 {
 433         struct sr_device_instance *sdi;
 434         void *info = NULL;
 435
 436         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 437                 return NULL;
 438
 439         switch (device_info_id) {
 440         case SR_DI_INSTANCE:
 441                 info = sdi;
 442                 break;
 443         case SR_DI_NUM_PROBES:
 444                 info = GINT_TO_POINTER(NUM_PROBES);
 445                 break;
 446         case SR_DI_SAMPLERATES:
 447                 info = &samplerates;
 448                 break;
 449         case SR_DI_TRIGGER_TYPES:
 450                 info = TRIGGER_TYPES;
 451                 break;
 452         case SR_DI_CUR_SAMPLERATE:
 453                 info = &cur_samplerate;
 454                 break;
 455         }
 456
 457         return info;
 458 }
 459
 460 static int hw_get_status(int device_index)
 461 {
 462         struct sr_device_instance *sdi;
 463
 464         sdi = sr_get_device_instance(device_instances, device_index);
 465         if (sdi)
 466                 return sdi->status;
 467         else
 468                 return SR_ST_NOT_FOUND;
 469 }
 470
 471 static int *hw_get_capabilities(void)
 472 {
 473         return capabilities;
 474 }
 475
 476 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 477                                         uint64_t samplerate)
 478 {
 479         uint8_t divider;
 480         int ret, result, i;
 481         unsigned char buf[2];
 482
 483         for (i = 0; supported_samplerates[i]; i++) {
 484                 if (supported_samplerates[i] == samplerate)
 485                         break;
 486         }
 487         if (supported_samplerates[i] == 0)
 488                 return SR_ERR_SAMPLERATE;
 489
 490         divider = (uint8_t) (48 / (samplerate / 1000000.0)) - 1;
 491
 492         sr_info("saleae: setting samplerate to %" PRIu64 " Hz (divider %d)",
 493                 samplerate, divider);
 494         buf[0] = 0x01;
 495         buf[1] = divider;
 496         ret = libusb_bulk_transfer(sdi->usb->devhdl, 1 | LIBUSB_ENDPOINT_OUT,
 497                                    buf, 2, &result, 500);
 498         if (ret != 0) {
 499                 sr_warn("failed to set samplerate: %d", ret);
 500                 return SR_ERR;
 501         }
 502         cur_samplerate = samplerate;
 503
 504         return SR_OK;
 505 }
 506
 507 static int hw_set_configuration(int device_index, int capability, void *value)
 508 {
 509         struct sr_device_instance *sdi;
 510         int ret;
 511         uint64_t *tmp_u64;
 512
 513         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 514                 return SR_ERR;
 515
 516         if (capability == SR_HWCAP_SAMPLERATE) {
 517                 tmp_u64 = value;
 518                 ret = set_configuration_samplerate(sdi, *tmp_u64);
 519         } else if (capability == SR_HWCAP_PROBECONFIG) {
 520                 ret = configure_probes((GSList *) value);
 521         } else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
 522                 tmp_u64 = value;
 523                 limit_samples = *tmp_u64;
 524                 ret = SR_OK;
 525         } else {
 526                 ret = SR_ERR;
 527         }
 528
 529         return ret;
 530 }
 531
 532 static int receive_data(int fd, int revents, void *user_data)
 533 {
 534         struct timeval tv;
 535
 536         /* Avoid compiler warnings. */
 537         fd = fd;
 538         revents = revents;
 539         user_data = user_data;
 540
 541         tv.tv_sec = tv.tv_usec = 0;
 542         libusb_handle_events_timeout(usb_context, &tv);
 543
 544         return TRUE;
 545 }
 546
 547 void receive_transfer(struct libusb_transfer *transfer)
 548 {
 549         static int num_samples = 0;
 550         static int empty_transfer_count = 0;
 551         struct sr_datafeed_packet packet;
 552         void *user_data;
 553         int cur_buflen, trigger_offset, i;
 554         unsigned char *cur_buf, *new_buf;
 555
 556         /* hw_stop_acquisition() is telling us to stop. */
 557         if (transfer == NULL)
 558                 num_samples = -1;
 559
 560         /*
 561          * If acquisition has already ended, just free any queued up
 562          * transfer that come in.
 563          */
 564         if (num_samples == -1) {
 565                 if (transfer)
 566                         libusb_free_transfer(transfer);
 567                 return;
 568         }
 569
 570         sr_info("saleae: receive_transfer(): status %d received %d bytes",
 571                 transfer->status, transfer->actual_length);
 572
 573         /* Save incoming transfer before reusing the transfer struct. */
 574         cur_buf = transfer->buffer;
 575         cur_buflen = transfer->actual_length;
 576         user_data = transfer->user_data;
 577
 578         /* Fire off a new request. */
 579         if (!(new_buf = g_try_malloc(4096))) {
 580                 sr_err("saleae: %s: new_buf malloc failed", __func__);
 581                 // return SR_ERR_MALLOC;
 582                 return; /* FIXME */
 583         }
 584
 585         transfer->buffer = new_buf;
 586         transfer->length = 4096;
 587         if (libusb_submit_transfer(transfer) != 0) {
 588                 /* TODO: Stop session? */
 589                 sr_warn("eek");
 590         }
 591
 592         if (cur_buflen == 0) {
 593                 empty_transfer_count++;
 594                 if (empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 595                         /*
 596                          * The FX2 gave up. End the acquisition, the frontend
 597                          * will work out that the samplecount is short.
 598                          */
 599                         hw_stop_acquisition(-1, user_data);
 600                 }
 601                 return;
 602         } else {
 603                 empty_transfer_count = 0;
 604         }
 605
 606         trigger_offset = 0;
 607         if (trigger_stage >= 0) {
 608                 for (i = 0; i < cur_buflen; i++) {
 609
 610                         if ((cur_buf[i] & trigger_mask[trigger_stage]) == trigger_value[trigger_stage]) {
 611                                 /* Match on this trigger stage. */
 612                                 trigger_buffer[trigger_stage] = cur_buf[i];
 613                                 trigger_stage++;
 614                                 if (trigger_stage == NUM_TRIGGER_STAGES || trigger_mask[trigger_stage] == 0) {
 615                                         /* Match on all trigger stages, we're done. */
 616                                         trigger_offset = i + 1;
 617
 618                                         /*
 619                                          * TODO: Send pre-trigger buffer to session bus.
 620                                          * Tell the frontend we hit the trigger here.
 621                                          */
 622                                         packet.type = SR_DF_TRIGGER;
 623                                         packet.length = 0;
 624                                         sr_session_bus(user_data, &packet);
 625
 626                                         /*
 627                                          * Send the samples that triggered it, since we're
 628                                          * skipping past them.
 629                                          */
 630                                         packet.type = SR_DF_LOGIC;
 631                                         packet.length = trigger_stage;
 632                                         packet.unitsize = 1;
 633                                         packet.payload = trigger_buffer;
 634                                         sr_session_bus(user_data, &packet);
 635
 636                                         trigger_stage = TRIGGER_FIRED;
 637                                         break;
 638                                 }
 639                                 return;
 640                         }
 641
 642                         /*
 643                          * We had a match before, but not in the next sample. However, we may
 644                          * have a match on this stage in the next bit -- trigger on 0001 will
 645                          * fail on seeing 00001, so we need to go back to stage 0 -- but at
 646                          * the next sample from the one that matched originally, which the
 647                          * counter increment at the end of the loop takes care of.
 648                          */
 649                         if (trigger_stage > 0) {
 650                                 i -= trigger_stage;
 651                                 if (i < -1)
 652                                         i = -1; /* Oops, went back past this buffer. */
 653                                 /* Reset trigger stage. */
 654                                 trigger_stage = 0;
 655                         }
 656
 657
 658                 }
 659         }
 660
 661         if (trigger_stage == TRIGGER_FIRED) {
 662                 /* Send the incoming transfer to the session bus. */
 663                 packet.type = SR_DF_LOGIC;
 664                 packet.length = cur_buflen - trigger_offset;
 665                 packet.unitsize = 1;
 666                 packet.payload = cur_buf + trigger_offset;
 667                 sr_session_bus(user_data, &packet);
 668                 g_free(cur_buf);
 669
 670                 num_samples += cur_buflen;
 671                 if (limit_samples && (unsigned int) num_samples > limit_samples) {
 672                         hw_stop_acquisition(-1, user_data);
 673                 }
 674         } else {
 675                 /*
 676                  * TODO: Buffer pre-trigger data in capture
 677                  * ratio-sized buffer.
 678                  */
 679         }
 680 }
 681
 682 static int hw_start_acquisition(int device_index, gpointer session_device_id)
 683 {
 684         struct sr_device_instance *sdi;
 685         struct sr_datafeed_packet *packet;
 686         struct sr_datafeed_header *header;
 687         struct libusb_transfer *transfer;
 688         const struct libusb_pollfd **lupfd;
 689         int size, i;
 690         unsigned char *buf;
 691
 692         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 693                 return SR_ERR;
 694
 695         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
 696                 sr_err("saleae: %s: packet malloc failed", __func__);
 697                 return SR_ERR_MALLOC;
 698         }
 699
 700         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
 701                 sr_err("saleae: %s: header malloc failed", __func__);
 702                 return SR_ERR_MALLOC;
 703         }
 704
 705         /* Start with 2K transfer, subsequently increased to 4K. */
 706         size = 2048;
 707         for (i = 0; i < NUM_SIMUL_TRANSFERS; i++) {
 708                 if (!(buf = g_try_malloc(size))) {
 709                         sr_err("saleae: %s: buf malloc failed", __func__);
 710                         return SR_ERR_MALLOC;
 711                 }
 712                 transfer = libusb_alloc_transfer(0);
 713                 libusb_fill_bulk_transfer(transfer, sdi->usb->devhdl,
 714                                 2 | LIBUSB_ENDPOINT_IN, buf, size,
 715                                 receive_transfer, session_device_id, 40);
 716                 if (libusb_submit_transfer(transfer) != 0) {
 717                         /* TODO: Free them all. */
 718                         libusb_free_transfer(transfer);
 719                         g_free(buf);
 720                         return SR_ERR;
 721                 }
 722                 size = 4096;
 723         }
 724
 725         lupfd = libusb_get_pollfds(usb_context);
 726         for (i = 0; lupfd[i]; i++)
 727                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, 40, receive_data,
 728                               NULL);
 729         free(lupfd);
 730
 731         packet->type = SR_DF_HEADER;
 732         packet->length = sizeof(struct sr_datafeed_header);
 733         packet->payload = (unsigned char *)header;
 734         header->feed_version = 1;
 735         gettimeofday(&header->starttime, NULL);
 736         header->samplerate = cur_samplerate;
 737         header->protocol_id = SR_PROTO_RAW;
 738         header->num_logic_probes = NUM_PROBES;
 739         header->num_analog_probes = 0;
 740         sr_session_bus(session_device_id, packet);
 741         g_free(header);
 742         g_free(packet);
 743
 744         return SR_OK;
 745 }
 746
 747 /* This stops acquisition on ALL devices, ignoring device_index. */
 748 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 749 {
 750         struct sr_datafeed_packet packet;
 751
 752         /* Avoid compiler warnings. */
 753         device_index = device_index;
 754
 755         packet.type = SR_DF_END;
 756         sr_session_bus(session_device_id, &packet);
 757
 758         receive_transfer(NULL);
 759
 760         /* TODO: Need to cancel and free any queued up transfers. */
 761 }
 762
 763 struct sr_device_plugin saleae_logic_plugin_info = {
 764         .name = "saleae-logic",
 765         .longname = "Saleae Logic",
 766         .api_version = 1,
 767         .init = hw_init,
 768         .cleanup = hw_cleanup,
 769         .opendev = hw_opendev,
 770         .closedev = hw_closedev,
 771         .get_device_info = hw_get_device_info,
 772         .get_status = hw_get_status,
 773         .get_capabilities = hw_get_capabilities,
 774         .set_configuration = hw_set_configuration,
 775         .start_acquisition = hw_start_acquisition,
 776         .stop_acquisition = hw_stop_acquisition,
 777 };