hardware/zeroplus-logic-cube/zeroplus.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 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 <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/time.h>
  24 #include <inttypes.h>
  25 #include <glib.h>
  26 #include <libusb.h>
  27 #include "config.h"
  28 #include "sigrok.h"
  29 #include "sigrok-internal.h"
  30 #include "analyzer.h"
  31
  32 #define USB_VENDOR                      0x0c12
  33 #define USB_VENDOR_NAME                 "Zeroplus"
  34 #define USB_MODEL_NAME                  "Logic Cube"
  35 #define USB_MODEL_VERSION               ""
  36
  37 #define USB_INTERFACE                   0
  38 #define USB_CONFIGURATION               1
  39 #define NUM_TRIGGER_STAGES              4
  40 #define TRIGGER_TYPES                   "01"
  41
  42 #define PACKET_SIZE                     2048    /* ?? */
  43
  44 typedef struct {
  45         unsigned short pid;
  46         char model_name[64];
  47         unsigned int channels;
  48         unsigned int sample_depth;      /* In Ksamples/channel */
  49         unsigned int max_sampling_freq;
  50 } model_t;
  51
  52 /*
  53  * Note -- 16032, 16064 and 16128 *usually* -- but not always -- have the
  54  * same 128K sample depth.
  55  */
  56 static model_t zeroplus_models[] = {
  57         {0x7009, "LAP-C(16064)",  16, 64,   100},
  58         {0x700A, "LAP-C(16128)",  16, 128,  200},
  59         {0x700B, "LAP-C(32128)",  32, 128,  200},
  60         {0x700C, "LAP-C(321000)", 32, 1024, 200},
  61         {0x700D, "LAP-C(322000)", 32, 2048, 200},
  62         {0x700E, "LAP-C(16032)",  16, 32,   100},
  63         {0x7016, "LAP-C(162000)", 16, 2048, 200},
  64 };
  65
  66 static int capabilities[] = {
  67         SR_HWCAP_LOGIC_ANALYZER,
  68         SR_HWCAP_SAMPLERATE,
  69         SR_HWCAP_PROBECONFIG,
  70         SR_HWCAP_CAPTURE_RATIO,
  71
  72         /* These are really implemented in the driver, not the hardware. */
  73         SR_HWCAP_LIMIT_SAMPLES,
  74         0,
  75 };
  76
  77 static const char *probe_names[] = {
  78         "0",
  79         "1",
  80         "2",
  81         "3",
  82         "4",
  83         "5",
  84         "6",
  85         "7",
  86         "8",
  87         "9",
  88         "10",
  89         "11",
  90         "12",
  91         "13",
  92         "14",
  93         "15",
  94         "16",
  95         "17",
  96         "18",
  97         "19",
  98         "20",
  99         "21",
 100         "22",
 101         "23",
 102         "24",
 103         "25",
 104         "26",
 105         "27",
 106         "28",
 107         "29",
 108         "30",
 109         "31",
 110         NULL,
 111 };
 112
 113 /* List of struct sr_device_instance, maintained by opendev()/closedev(). */
 114 static GSList *device_instances = NULL;
 115
 116 static libusb_context *usb_context = NULL;
 117
 118 /*
 119  * The hardware supports more samplerates than these, but these are the
 120  * options hardcoded into the vendor's Windows GUI.
 121  */
 122
 123 /*
 124  * TODO: We shouldn't support 150MHz and 200MHz on devices that don't go up
 125  * that high.
 126  */
 127 static uint64_t supported_samplerates[] = {
 128         SR_HZ(100),
 129         SR_HZ(500),
 130         SR_KHZ(1),
 131         SR_KHZ(5),
 132         SR_KHZ(25),
 133         SR_KHZ(50),
 134         SR_KHZ(100),
 135         SR_KHZ(200),
 136         SR_KHZ(400),
 137         SR_KHZ(800),
 138         SR_MHZ(1),
 139         SR_MHZ(10),
 140         SR_MHZ(25),
 141         SR_MHZ(50),
 142         SR_MHZ(80),
 143         SR_MHZ(100),
 144         SR_MHZ(150),
 145         SR_MHZ(200),
 146         0,
 147 };
 148
 149 static struct sr_samplerates samplerates = {
 150         SR_HZ(0),
 151         SR_HZ(0),
 152         SR_HZ(0),
 153         supported_samplerates,
 154 };
 155
 156 struct zp {
 157         uint64_t cur_samplerate;
 158         uint64_t limit_samples;
 159         int num_channels; /* TODO: This isn't initialized before it's needed :( */
 160         uint64_t memory_size;
 161         uint8_t probe_mask;
 162         uint8_t trigger_mask[NUM_TRIGGER_STAGES];
 163         uint8_t trigger_value[NUM_TRIGGER_STAGES];
 164         // uint8_t trigger_buffer[NUM_TRIGGER_STAGES];
 165
 166         struct sr_usb_device_instance *usb;
 167 };
 168
 169 static int hw_set_configuration(int device_index, int capability, void *value);
 170
 171 static unsigned int get_memory_size(int type)
 172 {
 173         if (type == MEMORY_SIZE_8K)
 174                 return 8 * 1024;
 175         else if (type == MEMORY_SIZE_64K)
 176                 return 64 * 1024;
 177         else if (type == MEMORY_SIZE_128K)
 178                 return 128 * 1024;
 179         else if (type == MEMORY_SIZE_512K)
 180                 return 512 * 1024;
 181         else
 182                 return 0;
 183 }
 184
 185 static int opendev4(struct sr_device_instance **sdi, libusb_device *dev,
 186                     struct libusb_device_descriptor *des)
 187 {
 188         struct zp *zp;
 189         unsigned int i;
 190         int err;
 191
 192         /* Note: sdi is non-NULL, the caller already checked this. */
 193
 194         if (!(zp = (*sdi)->priv)) {
 195                 sr_err("zp: %s: (*sdi)->priv was NULL", __func__);
 196                 return -1;
 197         }
 198
 199         if ((err = libusb_get_device_descriptor(dev, des))) {
 200                 sr_err("failed to get device descriptor: %d", err);
 201                 return -1;
 202         }
 203
 204         if (des->idVendor != USB_VENDOR)
 205                 return 0;
 206
 207         if (libusb_get_bus_number(dev) == zp->usb->bus
 208             && libusb_get_device_address(dev) == zp->usb->address) {
 209
 210                 for (i = 0; i < ARRAY_SIZE(zeroplus_models); i++) {
 211                         if (!(des->idProduct == zeroplus_models[i].pid))
 212                                 continue;
 213
 214                         sr_info("Found PID=%04X (%s)", des->idProduct,
 215                                 zeroplus_models[i].model_name);
 216                         zp->num_channels = zeroplus_models[i].channels;
 217                         zp->memory_size = zeroplus_models[i].sample_depth * 1024;
 218                         break;
 219                 }
 220
 221                 if (zp->num_channels == 0) {
 222                         sr_err("Unknown ZeroPlus device %04X", des->idProduct);
 223                         return -2;
 224                 }
 225
 226                 /* Found it. */
 227                 if (!(err = libusb_open(dev, &(zp->usb->devhdl)))) {
 228                         (*sdi)->status = SR_ST_ACTIVE;
 229                         sr_info("opened device %d on %d.%d interface %d",
 230                                 (*sdi)->index, zp->usb->bus,
 231                                 zp->usb->address, USB_INTERFACE);
 232                 } else {
 233                         sr_err("failed to open device: %d", err);
 234                         *sdi = NULL;
 235                 }
 236         }
 237
 238         return 0;
 239 }
 240
 241 static struct sr_device_instance *zp_open_device(int device_index)
 242 {
 243         struct sr_device_instance *sdi;
 244         libusb_device **devlist;
 245         struct libusb_device_descriptor des;
 246         int err, i;
 247
 248         if (!(sdi = sr_dev_inst_get(device_instances, device_index)))
 249                 return NULL;
 250
 251         libusb_get_device_list(usb_context, &devlist);
 252         if (sdi->status == SR_ST_INACTIVE) {
 253                 /* Find the device by vendor, product, bus and address. */
 254                 libusb_get_device_list(usb_context, &devlist);
 255                 for (i = 0; devlist[i]; i++) {
 256                         /* TODO: Error handling. */
 257                         err = opendev4(&sdi, devlist[i], &des);
 258                 }
 259         } else {
 260                 /* Status must be SR_ST_ACTIVE, i.e. already in use... */
 261                 sdi = NULL;
 262         }
 263         libusb_free_device_list(devlist, 1);
 264
 265         if (sdi && sdi->status != SR_ST_ACTIVE)
 266                 sdi = NULL;
 267
 268         return sdi;
 269 }
 270
 271 static void close_device(struct sr_device_instance *sdi)
 272 {
 273         struct zp *zp;
 274
 275         if (!(zp = sdi->priv)) {
 276                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 277                 return; /* FIXME */
 278         }
 279
 280         if (!zp->usb->devhdl)
 281                 return;
 282
 283         sr_info("closing device %d on %d.%d interface %d", sdi->index,
 284                 zp->usb->bus, zp->usb->address, USB_INTERFACE);
 285         libusb_release_interface(zp->usb->devhdl, USB_INTERFACE);
 286         libusb_reset_device(zp->usb->devhdl);
 287         libusb_close(zp->usb->devhdl);
 288         zp->usb->devhdl = NULL;
 289         /* TODO: Call libusb_exit() here or only in hw_cleanup()? */
 290         sdi->status = SR_ST_INACTIVE;
 291 }
 292
 293 static int configure_probes(struct sr_device_instance *sdi, GSList *probes)
 294 {
 295         struct zp *zp;
 296         struct sr_probe *probe;
 297         GSList *l;
 298         int probe_bit, stage, i;
 299         char *tc;
 300
 301         /* Note: sdi and sdi->priv are non-NULL, the caller checked this. */
 302         zp = sdi->priv;
 303
 304         zp->probe_mask = 0;
 305         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 306                 zp->trigger_mask[i] = 0;
 307                 zp->trigger_value[i] = 0;
 308         }
 309
 310         stage = -1;
 311         for (l = probes; l; l = l->next) {
 312                 probe = (struct sr_probe *)l->data;
 313                 if (probe->enabled == FALSE)
 314                         continue;
 315                 probe_bit = 1 << (probe->index - 1);
 316                 zp->probe_mask |= probe_bit;
 317
 318                 if (probe->trigger) {
 319                         stage = 0;
 320                         for (tc = probe->trigger; *tc; tc++) {
 321                                 zp->trigger_mask[stage] |= probe_bit;
 322                                 if (*tc == '1')
 323                                         zp->trigger_value[stage] |= probe_bit;
 324                                 stage++;
 325                                 if (stage > NUM_TRIGGER_STAGES)
 326                                         return SR_ERR;
 327                         }
 328                 }
 329         }
 330
 331         return SR_OK;
 332 }
 333
 334 /*
 335  * API callbacks
 336  */
 337
 338 static int hw_init(const char *deviceinfo)
 339 {
 340         struct sr_device_instance *sdi;
 341         struct libusb_device_descriptor des;
 342         libusb_device **devlist;
 343         int err, devcnt, i;
 344         struct zp *zp;
 345
 346         /* Avoid compiler warnings. */
 347         (void)deviceinfo;
 348
 349         /* Allocate memory for our private driver context. */
 350         if (!(zp = g_try_malloc(sizeof(struct zp)))) {
 351                 sr_err("zp: %s: struct zp malloc failed", __func__);
 352                 return 0;
 353         }
 354
 355         /* Set some sane defaults. */
 356         zp->cur_samplerate = 0;
 357         zp->limit_samples = 0;
 358         zp->num_channels = 32; /* TODO: This isn't initialized before it's needed :( */
 359         zp->memory_size = 0;
 360         zp->probe_mask = 0;
 361         memset(zp->trigger_mask, 0, NUM_TRIGGER_STAGES);
 362         memset(zp->trigger_value, 0, NUM_TRIGGER_STAGES);
 363         // memset(zp->trigger_buffer, 0, NUM_TRIGGER_STAGES);
 364
 365         if (libusb_init(&usb_context) != 0) {
 366                 sr_err("Failed to initialize USB.");
 367                 return 0;
 368         }
 369
 370         /* Find all ZeroPlus analyzers and add them to device list. */
 371         devcnt = 0;
 372         libusb_get_device_list(usb_context, &devlist); /* TODO: Errors. */
 373
 374         for (i = 0; devlist[i]; i++) {
 375                 err = libusb_get_device_descriptor(devlist[i], &des);
 376                 if (err != 0) {
 377                         sr_err("failed to get device descriptor: %d", err);
 378                         continue;
 379                 }
 380
 381                 if (des.idVendor == USB_VENDOR) {
 382                         /*
 383                          * Definitely a Zeroplus.
 384                          * TODO: Any way to detect specific model/version in
 385                          * the zeroplus range?
 386                          */
 387                         /* Register the device with libsigrok. */
 388                         sdi = sr_dev_inst_new(devcnt,
 389                                         SR_ST_INACTIVE, USB_VENDOR_NAME,
 390                                         USB_MODEL_NAME, USB_MODEL_VERSION);
 391                         if (!sdi) {
 392                                 sr_err("zp: %s: sr_device_instance_new failed",
 393                                        __func__);
 394                                 return 0;
 395                         }
 396
 397                         sdi->priv = zp;
 398
 399                         device_instances =
 400                             g_slist_append(device_instances, sdi);
 401                         zp->usb = sr_usb_dev_inst_new(
 402                                 libusb_get_bus_number(devlist[i]),
 403                                 libusb_get_device_address(devlist[i]), NULL);
 404                         devcnt++;
 405                 }
 406         }
 407         libusb_free_device_list(devlist, 1);
 408
 409         return devcnt;
 410 }
 411
 412 static int hw_opendev(int device_index)
 413 {
 414         struct sr_device_instance *sdi;
 415         struct zp *zp;
 416         int err;
 417
 418         if (!(sdi = zp_open_device(device_index))) {
 419                 sr_err("unable to open device");
 420                 return SR_ERR;
 421         }
 422
 423         /* TODO: Note: sdi is retrieved in zp_open_device(). */
 424
 425         if (!(zp = sdi->priv)) {
 426                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 427                 return SR_ERR_ARG;
 428         }
 429
 430         err = libusb_set_configuration(zp->usb->devhdl, USB_CONFIGURATION);
 431         if (err < 0) {
 432                 sr_err("zp: Unable to set USB configuration %d: %d",
 433                        USB_CONFIGURATION, err);
 434                 return SR_ERR;
 435         }
 436
 437         err = libusb_claim_interface(zp->usb->devhdl, USB_INTERFACE);
 438         if (err != 0) {
 439                 sr_err("Unable to claim interface: %d", err);
 440                 return SR_ERR;
 441         }
 442
 443         analyzer_reset(zp->usb->devhdl);
 444         analyzer_initialize(zp->usb->devhdl);
 445
 446         analyzer_set_memory_size(MEMORY_SIZE_512K);
 447         // analyzer_set_freq(g_freq, g_freq_scale);
 448         analyzer_set_trigger_count(1);
 449         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 450         // * get_memory_size(g_memory_size)) / 100) >> 2);
 451         analyzer_set_ramsize_trigger_address(
 452                 (100 * get_memory_size(MEMORY_SIZE_512K) / 100) >> 2);
 453
 454 #if 0
 455         if (g_double_mode == 1)
 456                 analyzer_set_compression(COMPRESSION_DOUBLE);
 457         else if (g_compression == 1)
 458                 analyzer_set_compression(COMPRESSION_ENABLE);
 459         else
 460 #endif
 461         analyzer_set_compression(COMPRESSION_NONE);
 462
 463         if (zp->cur_samplerate == 0) {
 464                 /* Samplerate hasn't been set. Default to the slowest one. */
 465                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 466                      &samplerates.list[0]) == SR_ERR)
 467                         return SR_ERR;
 468         }
 469
 470         return SR_OK;
 471 }
 472
 473 static int hw_closedev(int device_index)
 474 {
 475         struct sr_device_instance *sdi;
 476
 477         if (!(sdi = sr_dev_inst_get(device_instances, device_index))) {
 478                 sr_err("zp: %s: sdi was NULL", __func__);
 479                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 480         }
 481
 482         /* TODO */
 483         close_device(sdi);
 484
 485         return SR_OK;
 486 }
 487
 488 static int hw_cleanup(void)
 489 {
 490         GSList *l;
 491
 492         /* TODO: Error handling. */
 493
 494         /* Properly close all devices... */
 495         for (l = device_instances; l; l = l->next)
 496                 close_device((struct sr_device_instance *)l->data);
 497
 498         /* ...and free all their memory. */
 499         for (l = device_instances; l; l = l->next)
 500                 g_free(l->data);
 501         g_slist_free(device_instances);
 502         device_instances = NULL;
 503
 504         if (usb_context)
 505                 libusb_exit(usb_context);
 506         usb_context = NULL;
 507
 508         return SR_OK;
 509 }
 510
 511 static void *hw_get_device_info(int device_index, int device_info_id)
 512 {
 513         struct sr_device_instance *sdi;
 514         struct zp *zp;
 515         void *info;
 516
 517         if (!(sdi = sr_dev_inst_get(device_instances, device_index))) {
 518                 sr_err("zp: %s: sdi was NULL", __func__);
 519                 return NULL;
 520         }
 521
 522         if (!(zp = sdi->priv)) {
 523                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 524                 return NULL;
 525         }
 526
 527         switch (device_info_id) {
 528         case SR_DI_INSTANCE:
 529                 info = sdi;
 530                 break;
 531         case SR_DI_NUM_PROBES:
 532                 info = GINT_TO_POINTER(zp->num_channels);
 533                 break;
 534         case SR_DI_PROBE_NAMES:
 535                 info = probe_names;
 536                 break;
 537         case SR_DI_SAMPLERATES:
 538                 info = &samplerates;
 539                 break;
 540         case SR_DI_TRIGGER_TYPES:
 541                 info = TRIGGER_TYPES;
 542                 break;
 543         case SR_DI_CUR_SAMPLERATE:
 544                 info = &zp->cur_samplerate;
 545                 break;
 546         default:
 547                 /* Unknown device info ID, return NULL. */
 548                 sr_err("zp: %s: Unknown device info ID", __func__);
 549                 info = NULL;
 550                 break;
 551         }
 552
 553         return info;
 554 }
 555
 556 static int hw_get_status(int device_index)
 557 {
 558         struct sr_device_instance *sdi;
 559
 560         sdi = sr_dev_inst_get(device_instances, device_index);
 561         if (sdi)
 562                 return sdi->status;
 563         else
 564                 return SR_ST_NOT_FOUND;
 565 }
 566
 567 static int *hw_get_capabilities(void)
 568 {
 569         return capabilities;
 570 }
 571
 572 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 573                                         uint64_t samplerate)
 574 {
 575         struct zp *zp;
 576
 577         if (!sdi) {
 578                 sr_err("zp: %s: sdi was NULL", __func__);
 579                 return SR_ERR_ARG;
 580         }
 581
 582         if (!(zp = sdi->priv)) {
 583                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 584                 return SR_ERR_ARG;
 585         }
 586
 587         sr_info("zp: Setting samplerate to %" PRIu64 "Hz.", samplerate);
 588
 589         if (samplerate > SR_MHZ(1))
 590                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 591         else if (samplerate > SR_KHZ(1))
 592                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 593         else
 594                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 595
 596         zp->cur_samplerate = samplerate;
 597
 598         return SR_OK;
 599 }
 600
 601 static int hw_set_configuration(int device_index, int capability, void *value)
 602 {
 603         struct sr_device_instance *sdi;
 604         uint64_t *tmp_u64;
 605         struct zp *zp;
 606
 607         if (!(sdi = sr_dev_inst_get(device_instances, device_index))) {
 608                 sr_err("zp: %s: sdi was NULL", __func__);
 609                 return SR_ERR;
 610         }
 611
 612         if (!(zp = sdi->priv)) {
 613                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 614                 return SR_ERR_ARG;
 615         }
 616
 617         switch (capability) {
 618         case SR_HWCAP_SAMPLERATE:
 619                 tmp_u64 = value;
 620                 return set_configuration_samplerate(sdi, *tmp_u64);
 621         case SR_HWCAP_PROBECONFIG:
 622                 return configure_probes(sdi, (GSList *)value);
 623         case SR_HWCAP_LIMIT_SAMPLES:
 624                 tmp_u64 = value;
 625                 zp->limit_samples = *tmp_u64;
 626                 return SR_OK;
 627         default:
 628                 return SR_ERR;
 629         }
 630 }
 631
 632 static int hw_start_acquisition(int device_index, gpointer session_data)
 633 {
 634         struct sr_device_instance *sdi;
 635         struct sr_datafeed_packet packet;
 636         struct sr_datafeed_logic logic;
 637         struct sr_datafeed_header header;
 638         uint64_t samples_read;
 639         int res;
 640         unsigned int packet_num;
 641         unsigned char *buf;
 642         struct zp *zp;
 643
 644         if (!(sdi = sr_dev_inst_get(device_instances, device_index))) {
 645                 sr_err("zp: %s: sdi was NULL", __func__);
 646                 return SR_ERR;
 647         }
 648
 649         if (!(zp = sdi->priv)) {
 650                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 651                 return SR_ERR_ARG;
 652         }
 653
 654         /* push configured settings to device */
 655         analyzer_configure(zp->usb->devhdl);
 656
 657         analyzer_start(zp->usb->devhdl);
 658         sr_info("Waiting for data");
 659         analyzer_wait_data(zp->usb->devhdl);
 660
 661         sr_info("Stop address    = 0x%x", analyzer_get_stop_address(zp->usb->devhdl));
 662         sr_info("Now address     = 0x%x", analyzer_get_now_address(zp->usb->devhdl));
 663         sr_info("Trigger address = 0x%x", analyzer_get_trigger_address(zp->usb->devhdl));
 664
 665         packet.type = SR_DF_HEADER;
 666         packet.payload = &header;
 667         header.feed_version = 1;
 668         gettimeofday(&header.starttime, NULL);
 669         header.samplerate = zp->cur_samplerate;
 670         header.num_logic_probes = zp->num_channels;
 671         sr_session_bus(session_data, &packet);
 672
 673         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 674                 sr_err("zp: %s: buf malloc failed", __func__);
 675                 return SR_ERR_MALLOC;
 676         }
 677
 678         samples_read = 0;
 679         analyzer_read_start(zp->usb->devhdl);
 680         /* Send the incoming transfer to the session bus. */
 681         for (packet_num = 0; packet_num < (zp->memory_size * 4 / PACKET_SIZE);
 682              packet_num++) {
 683                 res = analyzer_read_data(zp->usb->devhdl, buf, PACKET_SIZE);
 684                 sr_info("Tried to read %llx bytes, actually read %x bytes",
 685                         PACKET_SIZE, res);
 686
 687                 packet.type = SR_DF_LOGIC;
 688                 packet.payload = &logic;
 689                 logic.length = PACKET_SIZE;
 690                 logic.unitsize = 4;
 691                 logic.data = buf;
 692                 sr_session_bus(session_data, &packet);
 693                 samples_read += res / 4;
 694         }
 695         analyzer_read_stop(zp->usb->devhdl);
 696         g_free(buf);
 697
 698         packet.type = SR_DF_END;
 699         sr_session_bus(session_data, &packet);
 700
 701         return SR_OK;
 702 }
 703
 704 /* This stops acquisition on ALL devices, ignoring device_index. */
 705 static int hw_stop_acquisition(int device_index, gpointer session_device_id)
 706 {
 707         struct sr_datafeed_packet packet;
 708         struct sr_device_instance *sdi;
 709         struct zp *zp;
 710
 711         packet.type = SR_DF_END;
 712         sr_session_bus(session_device_id, &packet);
 713
 714         if (!(sdi = sr_dev_inst_get(device_instances, device_index))) {
 715                 sr_err("zp: %s: sdi was NULL", __func__);
 716                 return SR_ERR_BUG;
 717         }
 718
 719         if (!(zp = sdi->priv)) {
 720                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 721                 return SR_ERR_BUG;
 722         }
 723
 724         analyzer_reset(zp->usb->devhdl);
 725         /* TODO: Need to cancel and free any queued up transfers. */
 726
 727         return SR_OK;
 728 }
 729
 730 SR_PRIV struct sr_device_plugin zeroplus_logic_cube_plugin_info = {
 731         .name = "zeroplus-logic-cube",
 732         .longname = "Zeroplus Logic Cube LAP-C series",
 733         .api_version = 1,
 734         .init = hw_init,
 735         .cleanup = hw_cleanup,
 736         .opendev = hw_opendev,
 737         .closedev = hw_closedev,
 738         .get_device_info = hw_get_device_info,
 739         .get_status = hw_get_status,
 740         .get_capabilities = hw_get_capabilities,
 741         .set_configuration = hw_set_configuration,
 742         .start_acquisition = hw_start_acquisition,
 743         .stop_acquisition = hw_stop_acquisition,
 744 };