hardware/hantek-dso/api.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 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 <stdint.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <sys/time.h>
  29 #include <inttypes.h>
  30 #include <glib.h>
  31 #include <libusb.h>
  32 #include "libsigrok.h"
  33 #include "libsigrok-internal.h"
  34 #include "dso.h"
  35
  36
  37 /* Max time in ms before we want to check on USB events */
  38 /* TODO tune this properly */
  39 #define TICK    1
  40
  41 static const int hwcaps[] = {
  42         SR_HWCAP_OSCILLOSCOPE,
  43         SR_HWCAP_LIMIT_SAMPLES,
  44         SR_HWCAP_CONTINUOUS,
  45         SR_HWCAP_TIMEBASE,
  46         SR_HWCAP_BUFFERSIZE,
  47         SR_HWCAP_TRIGGER_SOURCE,
  48         SR_HWCAP_TRIGGER_SLOPE,
  49         SR_HWCAP_HORIZ_TRIGGERPOS,
  50         SR_HWCAP_FILTER,
  51         SR_HWCAP_VDIV,
  52         SR_HWCAP_COUPLING,
  53         0,
  54 };
  55
  56 static const char *probe_names[] = {
  57         "CH1",
  58         "CH2",
  59         NULL,
  60 };
  61
  62 static const struct dso_profile dev_profiles[] = {
  63         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  64                 "Hantek", "DSO-2090",
  65                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  66         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  67                 "Hantek", "DSO-2150",
  68                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  69         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  70                 "Hantek", "DSO-2250",
  71                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  72         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  73                 "Hantek", "DSO-5200",
  74                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  75         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  76                 "Hantek", "DSO-5200A",
  77                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  78         { 0, 0, 0, 0, 0, 0, 0 },
  79 };
  80
  81 static const uint64_t buffersizes[] = {
  82         10240,
  83         32768,
  84         /* TODO: 65535 */
  85         0,
  86 };
  87
  88 static const struct sr_rational timebases[] = {
  89         /* microseconds */
  90         { 10, 1000000 },
  91         { 20, 1000000 },
  92         { 40, 1000000 },
  93         { 100, 1000000 },
  94         { 200, 1000000 },
  95         { 400, 1000000 },
  96         /* milliseconds */
  97         { 1, 1000 },
  98         { 2, 1000 },
  99         { 4, 1000 },
 100         { 10, 1000 },
 101         { 20, 1000 },
 102         { 40, 1000 },
 103         { 100, 1000 },
 104         { 200, 1000 },
 105         { 400, 1000 },
 106         { 0, 0},
 107 };
 108
 109 static const struct sr_rational vdivs[] = {
 110         /* millivolts */
 111         { 10, 1000 },
 112         { 20, 1000 },
 113         { 50, 1000 },
 114         { 100, 1000 },
 115         { 200, 1000 },
 116         { 500, 1000 },
 117         /* volts */
 118         { 1, 1 },
 119         { 2, 1 },
 120         { 5, 1 },
 121         { 0, 0 },
 122 };
 123
 124 static const char *trigger_sources[] = {
 125         "CH1",
 126         "CH2",
 127         "EXT",
 128         /* TODO: forced */
 129         NULL,
 130 };
 131
 132 static const char *filter_targets[] = {
 133         "CH1",
 134         "CH2",
 135         /* TODO: "TRIGGER", */
 136         NULL,
 137 };
 138
 139 static const char *coupling[] = {
 140         "AC",
 141         "DC",
 142         "GND",
 143         NULL,
 144 };
 145
 146 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 147 static struct sr_dev_driver *hdi = &hantek_dso_driver_info;
 148 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 149
 150 static struct sr_dev_inst *dso_dev_new(int index, const struct dso_profile *prof)
 151 {
 152         struct sr_dev_inst *sdi;
 153         struct sr_probe *probe;
 154         struct drv_context *drvc;
 155         struct dev_context *devc;
 156         int i;
 157
 158         sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
 159                 prof->vendor, prof->model, NULL);
 160         if (!sdi)
 161                 return NULL;
 162         sdi->driver = hdi;
 163
 164         /* Add only the real probes -- EXT isn't a source of data, only
 165          * a trigger source internal to the device.
 166          */
 167         for (i = 0; probe_names[i]; i++) {
 168                 if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
 169                                 probe_names[i])))
 170                         return NULL;
 171                 sdi->probes = g_slist_append(sdi->probes, probe);
 172         }
 173
 174         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 175                 sr_err("hantek-dso: devc malloc failed");
 176                 return NULL;
 177         }
 178         devc->profile = prof;
 179         devc->dev_state = IDLE;
 180         devc->timebase = DEFAULT_TIMEBASE;
 181         devc->ch1_enabled = TRUE;
 182         devc->ch2_enabled = TRUE;
 183         devc->voltage_ch1 = DEFAULT_VOLTAGE;
 184         devc->voltage_ch2 = DEFAULT_VOLTAGE;
 185         devc->coupling_ch1 = DEFAULT_COUPLING;
 186         devc->coupling_ch2 = DEFAULT_COUPLING;
 187         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 188         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 189         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 190         devc->framesize = DEFAULT_FRAMESIZE;
 191         devc->triggerslope = SLOPE_POSITIVE;
 192         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 193         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 194         sdi->priv = devc;
 195         drvc = hdi->priv;
 196         drvc->instances = g_slist_append(drvc->instances, sdi);
 197
 198         return sdi;
 199 }
 200
 201 static int configure_probes(const struct sr_dev_inst *sdi)
 202 {
 203         struct dev_context *devc;
 204         const struct sr_probe *probe;
 205         const GSList *l;
 206
 207         devc = sdi->priv;
 208
 209         devc->ch1_enabled = devc->ch2_enabled = FALSE;
 210         for (l = sdi->probes; l; l = l->next) {
 211                 probe = (struct sr_probe *)l->data;
 212                 if (probe->index == 0)
 213                         devc->ch1_enabled = probe->enabled;
 214                 else if (probe->index == 1)
 215                         devc->ch2_enabled = probe->enabled;
 216         }
 217
 218         return SR_OK;
 219 }
 220
 221 /* Properly close and free all devices. */
 222 static int clear_instances(void)
 223 {
 224         struct sr_dev_inst *sdi;
 225         struct drv_context *drvc;
 226         struct dev_context *devc;
 227         GSList *l;
 228
 229         drvc = hdi->priv;
 230         for (l = drvc->instances; l; l = l->next) {
 231                 if (!(sdi = l->data)) {
 232                         /* Log error, but continue cleaning up the rest. */
 233                         sr_err("hantek-dso: %s: sdi was NULL, continuing", __func__);
 234                         continue;
 235                 }
 236                 if (!(devc = sdi->priv)) {
 237                         /* Log error, but continue cleaning up the rest. */
 238                         sr_err("hantek-dso: %s: sdi->priv was NULL, continuing", __func__);
 239                         continue;
 240                 }
 241                 dso_close(sdi);
 242                 sr_usb_dev_inst_free(devc->usb);
 243                 g_free(devc->triggersource);
 244
 245                 sr_dev_inst_free(sdi);
 246         }
 247
 248         g_slist_free(drvc->instances);
 249         drvc->instances = NULL;
 250
 251         return SR_OK;
 252 }
 253
 254 static int hw_init(void)
 255 {
 256         struct drv_context *drvc;
 257
 258         if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
 259                 sr_err("hantek-dso: driver context malloc failed.");
 260                 return SR_ERR_MALLOC;
 261         }
 262
 263         if (libusb_init(NULL) != 0) {
 264                 g_free(drvc);
 265                 sr_err("hantek-dso: Failed to initialize USB.");
 266                 return SR_ERR;
 267         }
 268
 269         hdi->priv = drvc;
 270
 271         return SR_OK;
 272 }
 273
 274 static GSList *hw_scan(GSList *options)
 275 {
 276         struct sr_dev_inst *sdi;
 277         const struct dso_profile *prof;
 278         struct drv_context *drvc;
 279         struct dev_context *devc;
 280         GSList *devices;
 281         struct libusb_device_descriptor des;
 282         libusb_device **devlist;
 283         int devcnt, ret, i, j;
 284
 285         (void)options;
 286         devcnt = 0;
 287         devices = 0;
 288         drvc = hdi->priv;
 289         drvc->instances = NULL;
 290
 291         clear_instances();
 292
 293         /* Find all Hantek DSO devices and upload firmware to all of them. */
 294         libusb_get_device_list(NULL, &devlist);
 295         for (i = 0; devlist[i]; i++) {
 296                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 297                         sr_err("hantek-dso: failed to get device descriptor: %d", ret);
 298                         continue;
 299                 }
 300
 301                 prof = NULL;
 302                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 303                         if (des.idVendor == dev_profiles[j].orig_vid
 304                                 && des.idProduct == dev_profiles[j].orig_pid) {
 305                                 /* Device matches the pre-firmware profile. */
 306                                 prof = &dev_profiles[j];
 307                                 sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
 308                                 sdi = dso_dev_new(devcnt, prof);
 309                                 devices = g_slist_append(devices, sdi);
 310                                 devc = sdi->priv;
 311                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 312                                                 prof->firmware) == SR_OK)
 313                                         /* Remember when the firmware on this device was updated */
 314                                         devc->fw_updated = g_get_monotonic_time();
 315                                 else
 316                                         sr_err("hantek-dso: firmware upload failed for "
 317                                                "device %d", devcnt);
 318                                 /* Dummy USB address of 0xff will get overwritten later. */
 319                                 devc->usb = sr_usb_dev_inst_new(
 320                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 321                                 devcnt++;
 322                                 break;
 323                         } else if (des.idVendor == dev_profiles[j].fw_vid
 324                                 && des.idProduct == dev_profiles[j].fw_pid) {
 325                                 /* Device matches the post-firmware profile. */
 326                                 prof = &dev_profiles[j];
 327                                 sr_dbg("hantek-dso: Found a %s %s.", prof->vendor, prof->model);
 328                                 sdi = dso_dev_new(devcnt, prof);
 329                                 sdi->status = SR_ST_INACTIVE;
 330                                 devices = g_slist_append(devices, sdi);
 331                                 devc = sdi->priv;
 332                                 devc->usb = sr_usb_dev_inst_new(
 333                                                 libusb_get_bus_number(devlist[i]),
 334                                                 libusb_get_device_address(devlist[i]), NULL);
 335                                 devcnt++;
 336                                 break;
 337                         }
 338                 }
 339                 if (!prof)
 340                         /* not a supported VID/PID */
 341                         continue;
 342         }
 343         libusb_free_device_list(devlist, 1);
 344
 345         return devices;
 346 }
 347
 348 static GSList *hw_dev_list(void)
 349 {
 350         struct drv_context *drvc;
 351
 352         drvc = hdi->priv;
 353
 354         return drvc->instances;
 355 }
 356
 357 static int hw_dev_open(struct sr_dev_inst *sdi)
 358 {
 359         struct dev_context *devc;
 360         int64_t timediff_us, timediff_ms;
 361         int err;
 362
 363         devc = sdi->priv;
 364
 365         /*
 366          * if the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 367          * for the FX2 to renumerate
 368          */
 369         err = SR_ERR;
 370         if (devc->fw_updated > 0) {
 371                 sr_info("hantek-dso: waiting for device to reset");
 372                 /* takes at least 300ms for the FX2 to be gone from the USB bus */
 373                 g_usleep(300 * 1000);
 374                 timediff_ms = 0;
 375                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 376                         if ((err = dso_open(sdi)) == SR_OK)
 377                                 break;
 378                         g_usleep(100 * 1000);
 379                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 380                         timediff_ms = timediff_us / 1000;
 381                         sr_spew("hantek-dso: waited %" PRIi64 " ms", timediff_ms);
 382                 }
 383                 sr_info("hantek-dso: device came back after %d ms", timediff_ms);
 384         } else {
 385                 err = dso_open(sdi);
 386         }
 387
 388         if (err != SR_OK) {
 389                 sr_err("hantek-dso: unable to open device");
 390                 return SR_ERR;
 391         }
 392
 393         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 394         if (err != 0) {
 395                 sr_err("hantek-dso: Unable to claim interface: %d", err);
 396                 return SR_ERR;
 397         }
 398
 399         return SR_OK;
 400 }
 401
 402 static int hw_dev_close(struct sr_dev_inst *sdi)
 403 {
 404
 405         dso_close(sdi);
 406
 407         return SR_OK;
 408 }
 409
 410 static int hw_cleanup(void)
 411 {
 412         struct drv_context *drvc;
 413
 414         if (!(drvc = hdi->priv))
 415                 return SR_OK;
 416
 417         clear_instances();
 418
 419         libusb_exit(NULL);
 420
 421         return SR_OK;
 422 }
 423
 424 static int hw_info_get(int info_id, const void **data,
 425        const struct sr_dev_inst *sdi)
 426 {
 427         uint64_t tmp;
 428
 429         (void)sdi;
 430
 431         switch (info_id) {
 432         case SR_DI_HWCAPS:
 433                 *data = hwcaps;
 434                 break;
 435         case SR_DI_NUM_PROBES:
 436                 *data = GINT_TO_POINTER(NUM_PROBES);
 437                 break;
 438         case SR_DI_PROBE_NAMES:
 439                 *data = probe_names;
 440                 break;
 441         case SR_DI_BUFFERSIZES:
 442                 *data = buffersizes;
 443                 break;
 444         case SR_DI_TIMEBASES:
 445                 *data = timebases;
 446                 break;
 447         case SR_DI_TRIGGER_SOURCES:
 448                 *data = trigger_sources;
 449                 break;
 450         case SR_DI_FILTERS:
 451                 *data = filter_targets;
 452                 break;
 453         case SR_DI_VDIVS:
 454                 *data = vdivs;
 455                 break;
 456         case SR_DI_COUPLING:
 457                 *data = coupling;
 458                 break;
 459         /* TODO remove this */
 460         case SR_DI_CUR_SAMPLERATE:
 461                 *data = &tmp;
 462                 break;
 463         default:
 464                 return SR_ERR_ARG;
 465         }
 466
 467         return SR_OK;
 468 }
 469
 470 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 471                 const void *value)
 472 {
 473         struct dev_context *devc;
 474         struct sr_rational tmp_rat;
 475         float tmp_float;
 476         uint64_t tmp_u64;
 477         int ret, i;
 478         char **targets;
 479
 480         if (sdi->status != SR_ST_ACTIVE)
 481                 return SR_ERR;
 482
 483         ret = SR_OK;
 484         devc = sdi->priv;
 485         switch (hwcap) {
 486         case SR_HWCAP_LIMIT_FRAMES:
 487                 devc->limit_frames = *(const uint64_t *)value;
 488                 break;
 489         case SR_HWCAP_TRIGGER_SLOPE:
 490                 tmp_u64 = *(const int *)value;
 491                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 492                         ret = SR_ERR_ARG;
 493                 devc->triggerslope = tmp_u64;
 494                 break;
 495         case SR_HWCAP_HORIZ_TRIGGERPOS:
 496                 tmp_float = *(const float *)value;
 497                 if (tmp_float < 0.0 || tmp_float > 1.0) {
 498                         sr_err("hantek-dso: trigger position should be between 0.0 and 1.0");
 499                         ret = SR_ERR_ARG;
 500                 } else
 501                         devc->triggerposition = tmp_float;
 502                 break;
 503         case SR_HWCAP_BUFFERSIZE:
 504                 tmp_u64 = *(const int *)value;
 505                 for (i = 0; buffersizes[i]; i++) {
 506                         if (buffersizes[i] == tmp_u64) {
 507                                 devc->framesize = tmp_u64;
 508                                 break;
 509                         }
 510                 }
 511                 if (buffersizes[i] == 0)
 512                         ret = SR_ERR_ARG;
 513                 break;
 514         case SR_HWCAP_TIMEBASE:
 515                 tmp_rat = *(const struct sr_rational *)value;
 516                 for (i = 0; timebases[i].p && timebases[i].q; i++) {
 517                         if (timebases[i].p == tmp_rat.p
 518                                         && timebases[i].q == tmp_rat.q) {
 519                                 devc->timebase = i;
 520                                 break;
 521                         }
 522                 }
 523                 if (timebases[i].p == 0 && timebases[i].q == 0)
 524                         ret = SR_ERR_ARG;
 525                 break;
 526         case SR_HWCAP_TRIGGER_SOURCE:
 527                 for (i = 0; trigger_sources[i]; i++) {
 528                         if (!strcmp(value, trigger_sources[i])) {
 529                                 devc->triggersource = g_strdup(value);
 530                                 break;
 531                         }
 532                 }
 533                 if (trigger_sources[i] == 0)
 534                         ret = SR_ERR_ARG;
 535                 break;
 536         case SR_HWCAP_FILTER:
 537                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 538                 targets = g_strsplit(value, ",", 0);
 539                 for (i = 0; targets[i]; i++) {
 540                         if (targets[i] == '\0')
 541                                 /* Empty filter string can be used to clear them all. */
 542                                 ;
 543                         else if (!strcmp(targets[i], "CH1"))
 544                                 devc->filter_ch1 = TRUE;
 545                         else if (!strcmp(targets[i], "CH2"))
 546                                 devc->filter_ch2 = TRUE;
 547                         else if (!strcmp(targets[i], "TRIGGER"))
 548                                 devc->filter_trigger = TRUE;
 549                         else {
 550                                 sr_err("invalid filter target %s", targets[i]);
 551                                 ret = SR_ERR_ARG;
 552                         }
 553                 }
 554                 g_strfreev(targets);
 555                 break;
 556         case SR_HWCAP_VDIV:
 557                 /* TODO not supporting vdiv per channel yet */
 558                 tmp_rat = *(const struct sr_rational *)value;
 559                 for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
 560                         if (vdivs[i].p == tmp_rat.p
 561                                         && vdivs[i].q == tmp_rat.q) {
 562                                 devc->voltage_ch1 = i;
 563                                 devc->voltage_ch2 = i;
 564                                 break;
 565                         }
 566                 }
 567                 if (vdivs[i].p == 0 && vdivs[i].q == 0)
 568                         ret = SR_ERR_ARG;
 569                 break;
 570         case SR_HWCAP_COUPLING:
 571                 /* TODO not supporting coupling per channel yet */
 572                 for (i = 0; coupling[i]; i++) {
 573                         if (!strcmp(value, coupling[i])) {
 574                                 devc->coupling_ch1 = i;
 575                                 devc->coupling_ch2 = i;
 576                                 break;
 577                         }
 578                 }
 579                 if (coupling[i] == 0)
 580                         ret = SR_ERR_ARG;
 581                 break;
 582         default:
 583                 ret = SR_ERR_ARG;
 584         }
 585
 586         return ret;
 587 }
 588
 589 static void send_chunk(struct dev_context *devc, unsigned char *buf,
 590                 int num_samples)
 591 {
 592         struct sr_datafeed_packet packet;
 593         struct sr_datafeed_analog analog;
 594         float ch1, ch2, range;
 595         int num_probes, data_offset, i;
 596
 597         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 598         packet.type = SR_DF_ANALOG;
 599         packet.payload = &analog;
 600         /* TODO: support for 5xxx series 9-bit samples */
 601         analog.num_samples = num_samples;
 602         analog.mq = SR_MQ_VOLTAGE;
 603         analog.unit = SR_UNIT_VOLT;
 604         /* TODO: Check malloc return value. */
 605         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 606         data_offset = 0;
 607         for (i = 0; i < analog.num_samples; i++) {
 608                 /* The device always sends data for both channels. If a channel
 609                  * is disabled, it contains a copy of the enabled channel's
 610                  * data. However, we only send the requested channels to the bus.
 611                  *
 612                  * Voltage values are encoded as a value 0-255 (0-512 on the 5200*),
 613                  * where the value is a point in the range represented by the vdiv
 614                  * setting. There are 8 vertical divs, so e.g. 500mV/div represents
 615                  * 4V peak-to-peak where 0 = -2V and 255 = +2V.
 616                  */
 617                 /* TODO: support for 5xxx series 9-bit samples */
 618                 if (devc->ch1_enabled) {
 619                         range = ((float)vdivs[devc->voltage_ch1].p / vdivs[devc->voltage_ch1].q) * 8;
 620                         ch1 = range / 255 * *(buf + i * 2 + 1);
 621                         /* Value is centered around 0V. */
 622                         ch1 -= range / 2;
 623                         analog.data[data_offset++] = ch1;
 624                 }
 625                 if (devc->ch2_enabled) {
 626                         range = ((float)vdivs[devc->voltage_ch2].p / vdivs[devc->voltage_ch2].q) * 8;
 627                         ch2 = range / 255 * *(buf + i * 2);
 628                         ch2 -= range / 2;
 629                         analog.data[data_offset++] = ch2;
 630                 }
 631         }
 632         sr_session_send(devc->cb_data, &packet);
 633
 634 }
 635
 636 /* Called by libusb (as triggered by handle_event()) when a transfer comes in.
 637  * Only channel data comes in asynchronously, and all transfers for this are
 638  * queued up beforehand, so this just needs so chuck the incoming data onto
 639  * the libsigrok session bus.
 640  */
 641 static void receive_transfer(struct libusb_transfer *transfer)
 642 {
 643         struct sr_datafeed_packet packet;
 644         struct dev_context *devc;
 645         int num_samples, pre;
 646
 647         devc = transfer->user_data;
 648         sr_dbg("hantek-dso: receive_transfer(): status %d received %d bytes",
 649                         transfer->status, transfer->actual_length);
 650
 651         if (transfer->actual_length == 0)
 652                 /* Nothing to send to the bus. */
 653                 return;
 654
 655         num_samples = transfer->actual_length / 2;
 656
 657         sr_dbg("hantek-dso: got %d-%d/%d samples in frame", devc->samp_received + 1,
 658                         devc->samp_received + num_samples, devc->framesize);
 659
 660         /* The device always sends a full frame, but the beginning of the frame
 661          * doesn't represent the trigger point. The offset at which the trigger
 662          * happened came in with the capture state, so we need to start sending
 663          * from there up the session bus. The samples in the frame buffer before
 664          * that trigger point came after the end of the device's frame buffer was
 665          * reached, and it wrapped around to overwrite up until the trigger point.
 666          */
 667         if (devc->samp_received < devc->trigger_offset) {
 668                 /* Trigger point not yet reached. */
 669                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 670                         /* The entire chunk is before the trigger point. */
 671                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 672                                         transfer->buffer, num_samples * 2);
 673                         devc->samp_buffered += num_samples;
 674                 } else {
 675                         /* This chunk hits or overruns the trigger point.
 676                          * Store the part before the trigger fired, and
 677                          * send the rest up to the session bus. */
 678                         pre = devc->trigger_offset - devc->samp_received;
 679                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 680                                         transfer->buffer, pre * 2);
 681                         devc->samp_buffered += pre;
 682
 683                         /* The rest of this chunk starts with the trigger point. */
 684                         sr_dbg("hantek-dso: reached trigger point, %d samples buffered",
 685                                         devc->samp_buffered);
 686
 687                         /* Avoid the corner case where the chunk ended at
 688                          * exactly the trigger point. */
 689                         if (num_samples > pre)
 690                                 send_chunk(devc, transfer->buffer + pre * 2,
 691                                                 num_samples - pre);
 692                 }
 693         } else {
 694                 /* Already past the trigger point, just send it all out. */
 695                 send_chunk(devc, transfer->buffer,
 696                                 num_samples);
 697         }
 698
 699         devc->samp_received += num_samples;
 700
 701         /* Everything in this transfer was either copied to the buffer or
 702          * sent to the session bus. */
 703         g_free(transfer->buffer);
 704         libusb_free_transfer(transfer);
 705
 706         if (devc->samp_received >= devc->framesize) {
 707                 /* That was the last chunk in this frame. Send the buffered
 708                  * pre-trigger samples out now, in one big chunk. */
 709                 sr_dbg("hantek-dso: end of frame, sending %d pre-trigger buffered samples",
 710                                 devc->samp_buffered);
 711                 send_chunk(devc, devc->framebuf, devc->samp_buffered);
 712
 713                 /* Mark the end of this frame. */
 714                 packet.type = SR_DF_FRAME_END;
 715                 sr_session_send(devc->cb_data, &packet);
 716
 717                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 718                         /* Terminate session */
 719                         devc->dev_state = STOPPING;
 720                 } else {
 721                         devc->dev_state = NEW_CAPTURE;
 722                 }
 723         }
 724
 725 }
 726
 727 static int handle_event(int fd, int revents, void *cb_data)
 728 {
 729         const struct sr_dev_inst *sdi;
 730         struct sr_datafeed_packet packet;
 731         struct timeval tv;
 732         struct dev_context *devc;
 733         const struct libusb_pollfd **lupfd;
 734         int num_probes, i;
 735         uint32_t trigger_offset;
 736         uint8_t capturestate;
 737
 738         /* Avoid compiler warnings. */
 739         (void)fd;
 740         (void)revents;
 741
 742         sdi = cb_data;
 743         devc = sdi->priv;
 744         if (devc->dev_state == STOPPING) {
 745                 /* We've been told to wind up the acquisition. */
 746                 sr_dbg("hantek-dso: stopping acquisition");
 747                 /* TODO: doesn't really cancel pending transfers so they might
 748                  * come in after SR_DF_END is sent. */
 749                 lupfd = libusb_get_pollfds(NULL);
 750                 for (i = 0; lupfd[i]; i++)
 751                         sr_source_remove(lupfd[i]->fd);
 752                 free(lupfd);
 753
 754                 packet.type = SR_DF_END;
 755                 sr_session_send(sdi, &packet);
 756
 757                 devc->dev_state = IDLE;
 758
 759                 return TRUE;
 760         }
 761
 762         /* Always handle pending libusb events. */
 763         tv.tv_sec = tv.tv_usec = 0;
 764         libusb_handle_events_timeout(NULL, &tv);
 765
 766         /* TODO: ugh */
 767         if (devc->dev_state == NEW_CAPTURE) {
 768                 if (dso_capture_start(devc) != SR_OK)
 769                         return TRUE;
 770                 if (dso_enable_trigger(devc) != SR_OK)
 771                         return TRUE;
 772 //              if (dso_force_trigger(devc) != SR_OK)
 773 //                      return TRUE;
 774                 sr_dbg("hantek-dso: successfully requested next chunk");
 775                 devc->dev_state = CAPTURE;
 776                 return TRUE;
 777         }
 778         if (devc->dev_state != CAPTURE)
 779                 return TRUE;
 780
 781         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 782                 return TRUE;
 783
 784         sr_dbg("hantek-dso: capturestate %d", capturestate);
 785         sr_dbg("hantek-dso: trigger offset 0x%.6x", trigger_offset);
 786         switch (capturestate) {
 787         case CAPTURE_EMPTY:
 788                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 789                         devc->capture_empty_count = 0;
 790                         if (dso_capture_start(devc) != SR_OK)
 791                                 break;
 792                         if (dso_enable_trigger(devc) != SR_OK)
 793                                 break;
 794 //                      if (dso_force_trigger(devc) != SR_OK)
 795 //                              break;
 796                         sr_dbg("hantek-dso: successfully requested next chunk");
 797                 }
 798                 break;
 799         case CAPTURE_FILLING:
 800                 /* no data yet */
 801                 break;
 802         case CAPTURE_READY_8BIT:
 803                 /* Remember where in the captured frame the trigger is. */
 804                 devc->trigger_offset = trigger_offset;
 805
 806                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 807                 /* TODO: Check malloc return value. */
 808                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 809                 devc->samp_buffered = devc->samp_received = 0;
 810
 811                 /* Tell the scope to send us the first frame. */
 812                 if (dso_get_channeldata(devc, receive_transfer) != SR_OK)
 813                         break;
 814
 815                 /* Don't hit the state machine again until we're done fetching
 816                  * the data we just told the scope to send.
 817                  */
 818                 devc->dev_state = FETCH_DATA;
 819
 820                 /* Tell the frontend a new frame is on the way. */
 821                 packet.type = SR_DF_FRAME_BEGIN;
 822                 sr_session_send(sdi, &packet);
 823                 break;
 824         case CAPTURE_READY_9BIT:
 825                 /* TODO */
 826                 sr_err("not yet supported");
 827                 break;
 828         case CAPTURE_TIMEOUT:
 829                 /* Doesn't matter, we'll try again next time. */
 830                 break;
 831         default:
 832                 sr_dbg("unknown capture state");
 833         }
 834
 835         return TRUE;
 836 }
 837
 838 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 839                 void *cb_data)
 840 {
 841         const struct libusb_pollfd **lupfd;
 842         struct sr_datafeed_packet packet;
 843         struct sr_datafeed_header header;
 844         struct sr_datafeed_meta_analog meta;
 845         struct dev_context *devc;
 846         int i;
 847
 848         if (sdi->status != SR_ST_ACTIVE)
 849                 return SR_ERR;
 850
 851         devc = sdi->priv;
 852         devc->cb_data = cb_data;
 853
 854         if (configure_probes(sdi) != SR_OK) {
 855                 sr_err("hantek-dso: failed to configured probes");
 856                 return SR_ERR;
 857         }
 858
 859         if (dso_init(devc) != SR_OK)
 860                 return SR_ERR;
 861
 862         if (dso_capture_start(devc) != SR_OK)
 863                 return SR_ERR;
 864
 865         devc->dev_state = CAPTURE;
 866         lupfd = libusb_get_pollfds(NULL);
 867         for (i = 0; lupfd[i]; i++)
 868                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK, handle_event,
 869                                 (void *)sdi);
 870         free(lupfd);
 871
 872         /* Send header packet to the session bus. */
 873         packet.type = SR_DF_HEADER;
 874         packet.payload = (unsigned char *)&header;
 875         header.feed_version = 1;
 876         gettimeofday(&header.starttime, NULL);
 877         sr_session_send(cb_data, &packet);
 878
 879         /* Send metadata about the SR_DF_ANALOG packets to come. */
 880         packet.type = SR_DF_META_ANALOG;
 881         packet.payload = &meta;
 882         meta.num_probes = NUM_PROBES;
 883         sr_session_send(cb_data, &packet);
 884
 885         return SR_OK;
 886 }
 887
 888 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 889 {
 890         struct dev_context *devc;
 891
 892         (void)cb_data;
 893
 894         if (sdi->status != SR_ST_ACTIVE)
 895                 return SR_ERR;
 896
 897         devc = sdi->priv;
 898         devc->dev_state = STOPPING;
 899
 900         return SR_OK;
 901 }
 902
 903 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 904         .name = "hantek-dso",
 905         .longname = "Hantek DSO",
 906         .api_version = 1,
 907         .init = hw_init,
 908         .cleanup = hw_cleanup,
 909         .scan = hw_scan,
 910         .dev_list = hw_dev_list,
 911         .dev_clear = clear_instances,
 912         .dev_open = hw_dev_open,
 913         .dev_close = hw_dev_close,
 914         .info_get = hw_info_get,
 915         .dev_config_set = hw_dev_config_set,
 916         .dev_acquisition_start = hw_dev_acquisition_start,
 917         .dev_acquisition_stop = hw_dev_acquisition_stop,
 918         .priv = NULL,
 919 };