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