hardware/zeroplus-logic-cube/zeroplus.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 <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 period_ps;
 159         uint64_t limit_samples;
 160         int num_channels; /* TODO: This isn't initialized before it's needed :( */
 161         uint64_t memory_size;
 162         uint8_t probe_mask;
 163         uint8_t trigger_mask[NUM_TRIGGER_STAGES];
 164         uint8_t trigger_value[NUM_TRIGGER_STAGES];
 165         // uint8_t trigger_buffer[NUM_TRIGGER_STAGES];
 166
 167         struct sr_usb_device_instance *usb;
 168 };
 169
 170 static int hw_set_configuration(int device_index, int capability, void *value);
 171
 172 static unsigned int get_memory_size(int type)
 173 {
 174         if (type == MEMORY_SIZE_8K)
 175                 return 8 * 1024;
 176         else if (type == MEMORY_SIZE_64K)
 177                 return 64 * 1024;
 178         else if (type == MEMORY_SIZE_128K)
 179                 return 128 * 1024;
 180         else if (type == MEMORY_SIZE_512K)
 181                 return 512 * 1024;
 182         else
 183                 return 0;
 184 }
 185
 186 static int opendev4(struct sr_device_instance **sdi, libusb_device *dev,
 187                     struct libusb_device_descriptor *des)
 188 {
 189         struct zp *zp;
 190         unsigned int i;
 191         int err;
 192
 193         /* Note: sdi is non-NULL, the caller already checked this. */
 194
 195         if (!(zp = (*sdi)->priv)) {
 196                 sr_err("zp: %s: (*sdi)->priv was NULL", __func__);
 197                 return -1;
 198         }
 199
 200         if ((err = libusb_get_device_descriptor(dev, des))) {
 201                 sr_warn("failed to get device descriptor: %d", err);
 202                 return -1;
 203         }
 204
 205         if (des->idVendor != USB_VENDOR)
 206                 return 0;
 207
 208         if (libusb_get_bus_number(dev) == zp->usb->bus
 209             && libusb_get_device_address(dev) == zp->usb->address) {
 210
 211                 for (i = 0; i < ARRAY_SIZE(zeroplus_models); i++) {
 212                         if (!(des->idProduct == zeroplus_models[i].pid))
 213                                 continue;
 214
 215                         sr_info("Found PID=%04X (%s)", des->idProduct,
 216                                 zeroplus_models[i].model_name);
 217                         zp->num_channels = zeroplus_models[i].channels;
 218                         zp->memory_size = zeroplus_models[i].sample_depth * 1024;
 219                         break;
 220                 }
 221
 222                 if (zp->num_channels == 0) {
 223                         sr_warn("Unknown ZeroPlus device %04X", des->idProduct);
 224                         return -2;
 225                 }
 226
 227                 /* Found it. */
 228                 if (!(err = libusb_open(dev, &(zp->usb->devhdl)))) {
 229                         (*sdi)->status = SR_ST_ACTIVE;
 230                         sr_info("opened device %d on %d.%d interface %d",
 231                                 (*sdi)->index, zp->usb->bus,
 232                                 zp->usb->address, USB_INTERFACE);
 233                 } else {
 234                         sr_warn("failed to open device: %d", err);
 235                         *sdi = NULL;
 236                 }
 237         }
 238
 239         return 0;
 240 }
 241
 242 static struct sr_device_instance *zp_open_device(int device_index)
 243 {
 244         struct sr_device_instance *sdi;
 245         libusb_device **devlist;
 246         struct libusb_device_descriptor des;
 247         int err, i;
 248
 249         if (!(sdi = sr_get_device_instance(device_instances, device_index)))
 250                 return NULL;
 251
 252         libusb_get_device_list(usb_context, &devlist);
 253         if (sdi->status == SR_ST_INACTIVE) {
 254                 /* Find the device by vendor, product, bus and address. */
 255                 libusb_get_device_list(usb_context, &devlist);
 256                 for (i = 0; devlist[i]; i++) {
 257                         /* TODO: Error handling. */
 258                         err = opendev4(&sdi, devlist[i], &des);
 259                 }
 260         } else {
 261                 /* Status must be SR_ST_ACTIVE, i.e. already in use... */
 262                 sdi = NULL;
 263         }
 264         libusb_free_device_list(devlist, 1);
 265
 266         if (sdi && sdi->status != SR_ST_ACTIVE)
 267                 sdi = NULL;
 268
 269         return sdi;
 270 }
 271
 272 static void close_device(struct sr_device_instance *sdi)
 273 {
 274         struct zp *zp;
 275
 276         if (!(zp = sdi->priv)) {
 277                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 278                 return; /* FIXME */
 279         }
 280
 281         if (!zp->usb->devhdl)
 282                 return;
 283
 284         sr_info("closing device %d on %d.%d interface %d", sdi->index,
 285                 zp->usb->bus, zp->usb->address, USB_INTERFACE);
 286         libusb_release_interface(zp->usb->devhdl, USB_INTERFACE);
 287         libusb_close(zp->usb->devhdl);
 288         zp->usb->devhdl = NULL;
 289         sdi->status = SR_ST_INACTIVE;
 290 }
 291
 292 static int configure_probes(struct sr_device_instance *sdi, GSList *probes)
 293 {
 294         struct zp *zp;
 295         struct sr_probe *probe;
 296         GSList *l;
 297         int probe_bit, stage, i;
 298         char *tc;
 299
 300         /* Note: sdi and sdi->priv are non-NULL, the caller checked this. */
 301         zp = sdi->priv;
 302
 303         zp->probe_mask = 0;
 304         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 305                 zp->trigger_mask[i] = 0;
 306                 zp->trigger_value[i] = 0;
 307         }
 308
 309         stage = -1;
 310         for (l = probes; l; l = l->next) {
 311                 probe = (struct sr_probe *)l->data;
 312                 if (probe->enabled == FALSE)
 313                         continue;
 314                 probe_bit = 1 << (probe->index - 1);
 315                 zp->probe_mask |= probe_bit;
 316
 317                 if (probe->trigger) {
 318                         stage = 0;
 319                         for (tc = probe->trigger; *tc; tc++) {
 320                                 zp->trigger_mask[stage] |= probe_bit;
 321                                 if (*tc == '1')
 322                                         zp->trigger_value[stage] |= probe_bit;
 323                                 stage++;
 324                                 if (stage > NUM_TRIGGER_STAGES)
 325                                         return SR_ERR;
 326                         }
 327                 }
 328         }
 329
 330         return SR_OK;
 331 }
 332
 333 /*
 334  * API callbacks
 335  */
 336
 337 static int hw_init(const char *deviceinfo)
 338 {
 339         struct sr_device_instance *sdi;
 340         struct libusb_device_descriptor des;
 341         libusb_device **devlist;
 342         int err, devcnt, i;
 343         struct zp *zp;
 344
 345         /* Avoid compiler warnings. */
 346         (void)deviceinfo;
 347
 348         /* Allocate memory for our private driver context. */
 349         if (!(zp = g_try_malloc(sizeof(struct zp)))) {
 350                 sr_err("zp: %s: struct zp malloc failed", __func__);
 351                 return 0;
 352         }
 353
 354         /* Set some sane defaults. */
 355         zp->cur_samplerate = 0;
 356         zp->period_ps = 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_warn("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);
 373
 374         for (i = 0; devlist[i]; i++) {
 375                 err = libusb_get_device_descriptor(devlist[i], &des);
 376                 if (err != 0) {
 377                         sr_warn("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_device_instance_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_device_instance_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_warn("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_claim_interface(zp->usb->devhdl, USB_INTERFACE);
 431         if (err != 0) {
 432                 sr_warn("Unable to claim interface: %d", err);
 433                 return SR_ERR;
 434         }
 435         analyzer_reset(zp->usb->devhdl);
 436         analyzer_initialize(zp->usb->devhdl);
 437
 438         analyzer_set_memory_size(MEMORY_SIZE_512K);
 439         // analyzer_set_freq(g_freq, g_freq_scale);
 440         analyzer_set_trigger_count(1);
 441         // analyzer_set_ramsize_trigger_address((((100 - g_pre_trigger)
 442         // * get_memory_size(g_memory_size)) / 100) >> 2);
 443         analyzer_set_ramsize_trigger_address(
 444                 (100 * get_memory_size(MEMORY_SIZE_512K) / 100) >> 2);
 445
 446 #if 0
 447         if (g_double_mode == 1)
 448                 analyzer_set_compression(COMPRESSION_DOUBLE);
 449         else if (g_compression == 1)
 450                 analyzer_set_compression(COMPRESSION_ENABLE);
 451         else
 452 #endif
 453         analyzer_set_compression(COMPRESSION_NONE);
 454
 455         if (zp->cur_samplerate == 0) {
 456                 /* Samplerate hasn't been set. Default to the slowest one. */
 457                 if (hw_set_configuration(device_index, SR_HWCAP_SAMPLERATE,
 458                      &samplerates.list[0]) == SR_ERR)
 459                         return SR_ERR;
 460         }
 461
 462         return SR_OK;
 463 }
 464
 465 static int hw_closedev(int device_index)
 466 {
 467         struct sr_device_instance *sdi;
 468
 469         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 470                 sr_err("zp: %s: sdi was NULL", __func__);
 471                 return SR_ERR; /* TODO: SR_ERR_ARG? */
 472         }
 473
 474         /* TODO */
 475         close_device(sdi);
 476
 477         return SR_OK;
 478 }
 479
 480 static void hw_cleanup(void)
 481 {
 482         GSList *l;
 483
 484         /* Properly close all devices... */
 485         for (l = device_instances; l; l = l->next)
 486                 close_device((struct sr_device_instance *)l->data);
 487
 488         /* ...and free all their memory. */
 489         for (l = device_instances; l; l = l->next)
 490                 g_free(l->data);
 491         g_slist_free(device_instances);
 492         device_instances = NULL;
 493
 494         if (usb_context)
 495                 libusb_exit(usb_context);
 496         usb_context = NULL;
 497 }
 498
 499 static void *hw_get_device_info(int device_index, int device_info_id)
 500 {
 501         struct sr_device_instance *sdi;
 502         struct zp *zp;
 503         void *info;
 504
 505         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 506                 sr_err("zp: %s: sdi was NULL", __func__);
 507                 return NULL;
 508         }
 509
 510         if (!(zp = sdi->priv)) {
 511                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 512                 return NULL;
 513         }
 514
 515         switch (device_info_id) {
 516         case SR_DI_INSTANCE:
 517                 info = sdi;
 518                 break;
 519         case SR_DI_NUM_PROBES:
 520                 info = GINT_TO_POINTER(zp->num_channels);
 521                 break;
 522         case SR_DI_PROBE_NAMES:
 523                 info = probe_names;
 524                 break;
 525         case SR_DI_SAMPLERATES:
 526                 info = &samplerates;
 527                 break;
 528         case SR_DI_TRIGGER_TYPES:
 529                 info = TRIGGER_TYPES;
 530                 break;
 531         case SR_DI_CUR_SAMPLERATE:
 532                 info = &zp->cur_samplerate;
 533                 break;
 534         default:
 535                 /* Unknown device info ID, return NULL. */
 536                 sr_err("zp: %s: Unknown device info ID", __func__);
 537                 info = NULL;
 538                 break;
 539         }
 540
 541         return info;
 542 }
 543
 544 static int hw_get_status(int device_index)
 545 {
 546         struct sr_device_instance *sdi;
 547
 548         sdi = sr_get_device_instance(device_instances, device_index);
 549         if (sdi)
 550                 return sdi->status;
 551         else
 552                 return SR_ST_NOT_FOUND;
 553 }
 554
 555 static int *hw_get_capabilities(void)
 556 {
 557         return capabilities;
 558 }
 559
 560 static int set_configuration_samplerate(struct sr_device_instance *sdi,
 561                                         uint64_t samplerate)
 562 {
 563         struct zp *zp;
 564
 565         if (!sdi) {
 566                 sr_err("zp: %s: sdi was NULL", __func__);
 567                 return SR_ERR_ARG;
 568         }
 569
 570         if (!(zp = sdi->priv)) {
 571                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 572                 return SR_ERR_ARG;
 573         }
 574
 575         sr_info("zp: Setting samplerate to %" PRIu64 "Hz.", samplerate);
 576
 577         if (samplerate > SR_MHZ(1))
 578                 analyzer_set_freq(samplerate / SR_MHZ(1), FREQ_SCALE_MHZ);
 579         else if (samplerate > SR_KHZ(1))
 580                 analyzer_set_freq(samplerate / SR_KHZ(1), FREQ_SCALE_KHZ);
 581         else
 582                 analyzer_set_freq(samplerate, FREQ_SCALE_HZ);
 583
 584         zp->cur_samplerate = samplerate;
 585         zp->period_ps = 1000000000000 / samplerate;
 586
 587         return SR_OK;
 588 }
 589
 590 static int hw_set_configuration(int device_index, int capability, void *value)
 591 {
 592         struct sr_device_instance *sdi;
 593         uint64_t *tmp_u64;
 594         struct zp *zp;
 595
 596         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 597                 sr_err("zp: %s: sdi was NULL", __func__);
 598                 return SR_ERR;
 599         }
 600
 601         if (!(zp = sdi->priv)) {
 602                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 603                 return SR_ERR_ARG;
 604         }
 605
 606         switch (capability) {
 607         case SR_HWCAP_SAMPLERATE:
 608                 tmp_u64 = value;
 609                 return set_configuration_samplerate(sdi, *tmp_u64);
 610         case SR_HWCAP_PROBECONFIG:
 611                 return configure_probes(sdi, (GSList *)value);
 612         case SR_HWCAP_LIMIT_SAMPLES:
 613                 tmp_u64 = value;
 614                 zp->limit_samples = *tmp_u64;
 615                 return SR_OK;
 616         default:
 617                 return SR_ERR;
 618         }
 619 }
 620
 621 static int hw_start_acquisition(int device_index, gpointer session_data)
 622 {
 623         struct sr_device_instance *sdi;
 624         struct sr_datafeed_packet packet;
 625         struct sr_datafeed_logic logic;
 626         struct sr_datafeed_header header;
 627         uint64_t samples_read;
 628         int res;
 629         unsigned int packet_num;
 630         unsigned char *buf;
 631         struct zp *zp;
 632
 633         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 634                 sr_err("zp: %s: sdi was NULL", __func__);
 635                 return SR_ERR;
 636         }
 637
 638         if (!(zp = sdi->priv)) {
 639                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 640                 return SR_ERR_ARG;
 641         }
 642
 643         /* push configured settings to device */
 644         analyzer_configure(zp->usb->devhdl);
 645
 646         analyzer_start(zp->usb->devhdl);
 647         sr_info("Waiting for data");
 648         analyzer_wait_data(zp->usb->devhdl);
 649
 650         sr_info("Stop address    = 0x%x", analyzer_get_stop_address(zp->usb->devhdl));
 651         sr_info("Now address     = 0x%x", analyzer_get_now_address(zp->usb->devhdl));
 652         sr_info("Trigger address = 0x%x", analyzer_get_trigger_address(zp->usb->devhdl));
 653
 654         packet.type = SR_DF_HEADER;
 655         packet.payload = &header;
 656         header.feed_version = 1;
 657         gettimeofday(&header.starttime, NULL);
 658         header.samplerate = zp->cur_samplerate;
 659         header.num_logic_probes = zp->num_channels;
 660         header.num_analog_probes = 0;
 661         sr_session_bus(session_data, &packet);
 662
 663         if (!(buf = g_try_malloc(PACKET_SIZE))) {
 664                 sr_err("zp: %s: buf malloc failed", __func__);
 665                 return SR_ERR_MALLOC;
 666         }
 667
 668         samples_read = 0;
 669         analyzer_read_start(zp->usb->devhdl);
 670         /* Send the incoming transfer to the session bus. */
 671         for (packet_num = 0; packet_num < (zp->memory_size * 4 / PACKET_SIZE);
 672              packet_num++) {
 673                 res = analyzer_read_data(zp->usb->devhdl, buf, PACKET_SIZE);
 674                 sr_info("Tried to read %llx bytes, actually read %x bytes",
 675                         PACKET_SIZE, res);
 676
 677                 packet.type = SR_DF_LOGIC;
 678                 packet.timeoffset = samples_read * zp->period_ps;
 679                 packet.duration = res / 4 * zp->period_ps;
 680                 packet.payload = &logic;
 681                 logic.length = PACKET_SIZE;
 682                 logic.unitsize = 4;
 683                 logic.data = buf;
 684                 sr_session_bus(session_data, &packet);
 685                 samples_read += res / 4;
 686         }
 687         analyzer_read_stop(zp->usb->devhdl);
 688         g_free(buf);
 689
 690         packet.type = SR_DF_END;
 691         sr_session_bus(session_data, &packet);
 692
 693         return SR_OK;
 694 }
 695
 696 /* This stops acquisition on ALL devices, ignoring device_index. */
 697 static void hw_stop_acquisition(int device_index, gpointer session_device_id)
 698 {
 699         struct sr_datafeed_packet packet;
 700         struct sr_device_instance *sdi;
 701         struct zp *zp;
 702
 703         packet.type = SR_DF_END;
 704         sr_session_bus(session_device_id, &packet);
 705
 706         if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
 707                 sr_err("zp: %s: sdi was NULL", __func__);
 708                 return; /* FIXME */
 709         }
 710
 711         if (!(zp = sdi->priv)) {
 712                 sr_err("zp: %s: sdi->priv was NULL", __func__);
 713                 return; /* FIXME */
 714         }
 715
 716         analyzer_reset(zp->usb->devhdl);
 717         /* TODO: Need to cancel and free any queued up transfers. */
 718 }
 719
 720 struct sr_device_plugin zeroplus_logic_cube_plugin_info = {
 721         .name = "zeroplus-logic-cube",
 722         .longname = "Zeroplus Logic Cube LAP-C series",
 723         .api_version = 1,
 724         .init = hw_init,
 725         .cleanup = hw_cleanup,
 726         .opendev = hw_opendev,
 727         .closedev = hw_closedev,
 728         .get_device_info = hw_get_device_info,
 729         .get_status = hw_get_status,
 730         .get_capabilities = hw_get_capabilities,
 731         .set_configuration = hw_set_configuration,
 732         .start_acquisition = hw_start_acquisition,
 733         .stop_acquisition = hw_stop_acquisition,
 734 };