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 /* Max time in ms before we want to check on USB events */
  37 /* TODO tune this properly */
  38 #define TICK 1
  39
  40 static const int hwcaps[] = {
  41         SR_HWCAP_OSCILLOSCOPE,
  42         SR_HWCAP_LIMIT_SAMPLES,
  43         SR_HWCAP_CONTINUOUS,
  44         SR_HWCAP_TIMEBASE,
  45         SR_HWCAP_BUFFERSIZE,
  46         SR_HWCAP_TRIGGER_SOURCE,
  47         SR_HWCAP_TRIGGER_SLOPE,
  48         SR_HWCAP_HORIZ_TRIGGERPOS,
  49         SR_HWCAP_FILTER,
  50         SR_HWCAP_VDIV,
  51         SR_HWCAP_COUPLING,
  52         0,
  53 };
  54
  55 static const char *probe_names[] = {
  56         "CH1",
  57         "CH2",
  58         NULL,
  59 };
  60
  61 static const struct dso_profile dev_profiles[] = {
  62         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  63                 "Hantek", "DSO-2090",
  64                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  65         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  66                 "Hantek", "DSO-2150",
  67                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  68         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  69                 "Hantek", "DSO-2250",
  70                 FIRMWARE_DIR "/hantek-dso-2xxx.fw" },
  71         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  72                 "Hantek", "DSO-5200",
  73                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  74         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  75                 "Hantek", "DSO-5200A",
  76                 FIRMWARE_DIR "/hantek-dso-5xxx.fw" },
  77         { 0, 0, 0, 0, 0, 0, 0 },
  78 };
  79
  80 static const uint64_t buffersizes[] = {
  81         10240,
  82         32768,
  83         /* TODO: 65535 */
  84         0,
  85 };
  86
  87 static const struct sr_rational timebases[] = {
  88         /* microseconds */
  89         { 10, 1000000 },
  90         { 20, 1000000 },
  91         { 40, 1000000 },
  92         { 100, 1000000 },
  93         { 200, 1000000 },
  94         { 400, 1000000 },
  95         /* milliseconds */
  96         { 1, 1000 },
  97         { 2, 1000 },
  98         { 4, 1000 },
  99         { 10, 1000 },
 100         { 20, 1000 },
 101         { 40, 1000 },
 102         { 100, 1000 },
 103         { 200, 1000 },
 104         { 400, 1000 },
 105         { 0, 0},
 106 };
 107
 108 static const struct sr_rational vdivs[] = {
 109         /* millivolts */
 110         { 10, 1000 },
 111         { 20, 1000 },
 112         { 50, 1000 },
 113         { 100, 1000 },
 114         { 200, 1000 },
 115         { 500, 1000 },
 116         /* volts */
 117         { 1, 1 },
 118         { 2, 1 },
 119         { 5, 1 },
 120         { 0, 0 },
 121 };
 122
 123 static const char *trigger_sources[] = {
 124         "CH1",
 125         "CH2",
 126         "EXT",
 127         /* TODO: forced */
 128         NULL,
 129 };
 130
 131 static const char *filter_targets[] = {
 132         "CH1",
 133         "CH2",
 134         /* TODO: "TRIGGER", */
 135         NULL,
 136 };
 137
 138 static const char *coupling[] = {
 139         "AC",
 140         "DC",
 141         "GND",
 142         NULL,
 143 };
 144
 145 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 146 static struct sr_dev_driver *hdi = &hantek_dso_driver_info;
 147
 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         /*
 165          * Add only the real probes -- EXT isn't a source of data, only
 166          * a trigger source internal to the device.
 167          */
 168         for (i = 0; probe_names[i]; i++) {
 169                 if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
 170                                 probe_names[i])))
 171                         return NULL;
 172                 sdi->probes = g_slist_append(sdi->probes, probe);
 173         }
 174
 175         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 176                 sr_err("Device context malloc failed.");
 177                 return NULL;
 178         }
 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 int 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("%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("%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         return SR_OK;
 254 }
 255
 256 static int hw_init(struct sr_context *sr_ctx)
 257 {
 258         struct drv_context *drvc;
 259
 260         if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
 261                 sr_err("Driver context malloc failed.");
 262                 return SR_ERR_MALLOC;
 263         }
 264
 265         drvc->sr_ctx = sr_ctx;
 266         hdi->priv = drvc;
 267
 268         return SR_OK;
 269 }
 270
 271 static GSList *hw_scan(GSList *options)
 272 {
 273         struct sr_dev_inst *sdi;
 274         const struct dso_profile *prof;
 275         struct drv_context *drvc;
 276         struct dev_context *devc;
 277         GSList *devices;
 278         struct libusb_device_descriptor des;
 279         libusb_device **devlist;
 280         int devcnt, ret, i, j;
 281
 282         (void)options;
 283
 284         devcnt = 0;
 285         devices = 0;
 286         drvc = hdi->priv;
 287         drvc->instances = NULL;
 288
 289         clear_instances();
 290
 291         /* Find all Hantek DSO devices and upload firmware to all of them. */
 292         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 293         for (i = 0; devlist[i]; i++) {
 294                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 295                         sr_err("Failed to get device descriptor: %s.",
 296                                libusb_error_name(ret));
 297                         continue;
 298                 }
 299
 300                 prof = NULL;
 301                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 302                         if (des.idVendor == dev_profiles[j].orig_vid
 303                                 && des.idProduct == dev_profiles[j].orig_pid) {
 304                                 /* Device matches the pre-firmware profile. */
 305                                 prof = &dev_profiles[j];
 306                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 307                                 sdi = dso_dev_new(devcnt, prof);
 308                                 devices = g_slist_append(devices, sdi);
 309                                 devc = sdi->priv;
 310                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 311                                                 prof->firmware) == SR_OK)
 312                                         /* Remember when the firmware on this device was updated */
 313                                         devc->fw_updated = g_get_monotonic_time();
 314                                 else
 315                                         sr_err("Firmware upload failed for "
 316                                                "device %d.", devcnt);
 317                                 /* Dummy USB address of 0xff will get overwritten later. */
 318                                 devc->usb = sr_usb_dev_inst_new(
 319                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 320                                 devcnt++;
 321                                 break;
 322                         } else if (des.idVendor == dev_profiles[j].fw_vid
 323                                 && des.idProduct == dev_profiles[j].fw_pid) {
 324                                 /* Device matches the post-firmware profile. */
 325                                 prof = &dev_profiles[j];
 326                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 327                                 sdi = dso_dev_new(devcnt, prof);
 328                                 sdi->status = SR_ST_INACTIVE;
 329                                 devices = g_slist_append(devices, sdi);
 330                                 devc = sdi->priv;
 331                                 devc->usb = sr_usb_dev_inst_new(
 332                                                 libusb_get_bus_number(devlist[i]),
 333                                                 libusb_get_device_address(devlist[i]), NULL);
 334                                 devcnt++;
 335                                 break;
 336                         }
 337                 }
 338                 if (!prof)
 339                         /* not a supported VID/PID */
 340                         continue;
 341         }
 342         libusb_free_device_list(devlist, 1);
 343
 344         return devices;
 345 }
 346
 347 static GSList *hw_dev_list(void)
 348 {
 349         struct drv_context *drvc;
 350
 351         drvc = hdi->priv;
 352
 353         return drvc->instances;
 354 }
 355
 356 static int hw_dev_open(struct sr_dev_inst *sdi)
 357 {
 358         struct dev_context *devc;
 359         int64_t timediff_us, timediff_ms;
 360         int err;
 361
 362         devc = sdi->priv;
 363
 364         /*
 365          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 366          * for the FX2 to renumerate.
 367          */
 368         err = SR_ERR;
 369         if (devc->fw_updated > 0) {
 370                 sr_info("Waiting for device to reset.");
 371                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 372                 g_usleep(300 * 1000);
 373                 timediff_ms = 0;
 374                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 375                         if ((err = dso_open(sdi)) == SR_OK)
 376                                 break;
 377                         g_usleep(100 * 1000);
 378                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 379                         timediff_ms = timediff_us / 1000;
 380                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 381                 }
 382                 sr_info("Device came back after %d ms.", timediff_ms);
 383         } else {
 384                 err = dso_open(sdi);
 385         }
 386
 387         if (err != SR_OK) {
 388                 sr_err("Unable to open device.");
 389                 return SR_ERR;
 390         }
 391
 392         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 393         if (err != 0) {
 394                 sr_err("Unable to claim interface: %s.",
 395                        libusb_error_name(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         dso_close(sdi);
 405
 406         return SR_OK;
 407 }
 408
 409 static int hw_cleanup(void)
 410 {
 411         struct drv_context *drvc;
 412
 413         if (!(drvc = hdi->priv))
 414                 return SR_OK;
 415
 416         clear_instances();
 417
 418         return SR_OK;
 419 }
 420
 421 static int hw_info_get(int info_id, const void **data,
 422                        const struct sr_dev_inst *sdi)
 423 {
 424         uint64_t tmp;
 425
 426         (void)sdi;
 427
 428         switch (info_id) {
 429         case SR_DI_HWCAPS:
 430                 *data = hwcaps;
 431                 break;
 432         case SR_DI_NUM_PROBES:
 433                 *data = GINT_TO_POINTER(NUM_PROBES);
 434                 break;
 435         case SR_DI_PROBE_NAMES:
 436                 *data = probe_names;
 437                 break;
 438         case SR_DI_BUFFERSIZES:
 439                 *data = buffersizes;
 440                 break;
 441         case SR_DI_TIMEBASES:
 442                 *data = timebases;
 443                 break;
 444         case SR_DI_TRIGGER_SOURCES:
 445                 *data = trigger_sources;
 446                 break;
 447         case SR_DI_FILTERS:
 448                 *data = filter_targets;
 449                 break;
 450         case SR_DI_VDIVS:
 451                 *data = vdivs;
 452                 break;
 453         case SR_DI_COUPLING:
 454                 *data = coupling;
 455                 break;
 456         /* TODO remove this */
 457         case SR_DI_CUR_SAMPLERATE:
 458                 *data = &tmp;
 459                 break;
 460         default:
 461                 return SR_ERR_ARG;
 462         }
 463
 464         return SR_OK;
 465 }
 466
 467 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 468                              const void *value)
 469 {
 470         struct dev_context *devc;
 471         struct sr_rational tmp_rat;
 472         float tmp_float;
 473         uint64_t tmp_u64;
 474         int ret, i;
 475         char **targets;
 476
 477         if (sdi->status != SR_ST_ACTIVE)
 478                 return SR_ERR;
 479
 480         ret = SR_OK;
 481         devc = sdi->priv;
 482         switch (hwcap) {
 483         case SR_HWCAP_LIMIT_FRAMES:
 484                 devc->limit_frames = *(const uint64_t *)value;
 485                 break;
 486         case SR_HWCAP_TRIGGER_SLOPE:
 487                 tmp_u64 = *(const int *)value;
 488                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 489                         ret = SR_ERR_ARG;
 490                 devc->triggerslope = tmp_u64;
 491                 break;
 492         case SR_HWCAP_HORIZ_TRIGGERPOS:
 493                 tmp_float = *(const float *)value;
 494                 if (tmp_float < 0.0 || tmp_float > 1.0) {
 495                         sr_err("Trigger position should be between 0.0 and 1.0.");
 496                         ret = SR_ERR_ARG;
 497                 } else
 498                         devc->triggerposition = tmp_float;
 499                 break;
 500         case SR_HWCAP_BUFFERSIZE:
 501                 tmp_u64 = *(const int *)value;
 502                 for (i = 0; buffersizes[i]; i++) {
 503                         if (buffersizes[i] == tmp_u64) {
 504                                 devc->framesize = tmp_u64;
 505                                 break;
 506                         }
 507                 }
 508                 if (buffersizes[i] == 0)
 509                         ret = SR_ERR_ARG;
 510                 break;
 511         case SR_HWCAP_TIMEBASE:
 512                 tmp_rat = *(const struct sr_rational *)value;
 513                 for (i = 0; timebases[i].p && timebases[i].q; i++) {
 514                         if (timebases[i].p == tmp_rat.p
 515                                         && timebases[i].q == tmp_rat.q) {
 516                                 devc->timebase = i;
 517                                 break;
 518                         }
 519                 }
 520                 if (timebases[i].p == 0 && timebases[i].q == 0)
 521                         ret = SR_ERR_ARG;
 522                 break;
 523         case SR_HWCAP_TRIGGER_SOURCE:
 524                 for (i = 0; trigger_sources[i]; i++) {
 525                         if (!strcmp(value, trigger_sources[i])) {
 526                                 devc->triggersource = g_strdup(value);
 527                                 break;
 528                         }
 529                 }
 530                 if (trigger_sources[i] == 0)
 531                         ret = SR_ERR_ARG;
 532                 break;
 533         case SR_HWCAP_FILTER:
 534                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 535                 targets = g_strsplit(value, ",", 0);
 536                 for (i = 0; targets[i]; i++) {
 537                         if (targets[i] == '\0')
 538                                 /* Empty filter string can be used to clear them all. */
 539                                 ;
 540                         else if (!strcmp(targets[i], "CH1"))
 541                                 devc->filter_ch1 = TRUE;
 542                         else if (!strcmp(targets[i], "CH2"))
 543                                 devc->filter_ch2 = TRUE;
 544                         else if (!strcmp(targets[i], "TRIGGER"))
 545                                 devc->filter_trigger = TRUE;
 546                         else {
 547                                 sr_err("Invalid filter target %s.", targets[i]);
 548                                 ret = SR_ERR_ARG;
 549                         }
 550                 }
 551                 g_strfreev(targets);
 552                 break;
 553         case SR_HWCAP_VDIV:
 554                 /* TODO: Not supporting vdiv per channel yet. */
 555                 tmp_rat = *(const struct sr_rational *)value;
 556                 for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
 557                         if (vdivs[i].p == tmp_rat.p
 558                                         && vdivs[i].q == tmp_rat.q) {
 559                                 devc->voltage_ch1 = i;
 560                                 devc->voltage_ch2 = i;
 561                                 break;
 562                         }
 563                 }
 564                 if (vdivs[i].p == 0 && vdivs[i].q == 0)
 565                         ret = SR_ERR_ARG;
 566                 break;
 567         case SR_HWCAP_COUPLING:
 568                 /* TODO: Not supporting coupling per channel yet. */
 569                 for (i = 0; coupling[i]; i++) {
 570                         if (!strcmp(value, coupling[i])) {
 571                                 devc->coupling_ch1 = i;
 572                                 devc->coupling_ch2 = i;
 573                                 break;
 574                         }
 575                 }
 576                 if (coupling[i] == 0)
 577                         ret = SR_ERR_ARG;
 578                 break;
 579         default:
 580                 ret = SR_ERR_ARG;
 581                 break;
 582         }
 583
 584         return ret;
 585 }
 586
 587 static void send_chunk(struct dev_context *devc, unsigned char *buf,
 588                 int num_samples)
 589 {
 590         struct sr_datafeed_packet packet;
 591         struct sr_datafeed_analog analog;
 592         float ch1, ch2, range;
 593         int num_probes, data_offset, i;
 594
 595         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 596         packet.type = SR_DF_ANALOG;
 597         packet.payload = &analog;
 598         /* TODO: support for 5xxx series 9-bit samples */
 599         analog.num_samples = num_samples;
 600         analog.mq = SR_MQ_VOLTAGE;
 601         analog.unit = SR_UNIT_VOLT;
 602         /* TODO: Check malloc return value. */
 603         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 604         data_offset = 0;
 605         for (i = 0; i < analog.num_samples; i++) {
 606                 /*
 607                  * The device always sends data for both channels. If a channel
 608                  * is disabled, it contains a copy of the enabled channel's
 609                  * data. However, we only send the requested channels to
 610                  * the bus.
 611                  *
 612                  * Voltage values are encoded as a value 0-255 (0-512 on the
 613                  * DSO-5200*), where the value is a point in the range
 614                  * represented by the vdiv setting. There are 8 vertical divs,
 615                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 616                  * and 255 = +2V.
 617                  */
 618                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 619                 if (devc->ch1_enabled) {
 620                         range = ((float)vdivs[devc->voltage_ch1].p / vdivs[devc->voltage_ch1].q) * 8;
 621                         ch1 = range / 255 * *(buf + i * 2 + 1);
 622                         /* Value is centered around 0V. */
 623                         ch1 -= range / 2;
 624                         analog.data[data_offset++] = ch1;
 625                 }
 626                 if (devc->ch2_enabled) {
 627                         range = ((float)vdivs[devc->voltage_ch2].p / vdivs[devc->voltage_ch2].q) * 8;
 628                         ch2 = range / 255 * *(buf + i * 2);
 629                         ch2 -= range / 2;
 630                         analog.data[data_offset++] = ch2;
 631                 }
 632         }
 633         sr_session_send(devc->cb_data, &packet);
 634 }
 635
 636 /*
 637  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 638  * Only channel data comes in asynchronously, and all transfers for this are
 639  * queued up beforehand, so this just needs to chuck the incoming data onto
 640  * the libsigrok session bus.
 641  */
 642 static void receive_transfer(struct libusb_transfer *transfer)
 643 {
 644         struct sr_datafeed_packet packet;
 645         struct dev_context *devc;
 646         int num_samples, pre;
 647
 648         devc = transfer->user_data;
 649         sr_dbg("receive_transfer(): status %d received %d bytes.",
 650                transfer->status, transfer->actual_length);
 651
 652         if (transfer->actual_length == 0)
 653                 /* Nothing to send to the bus. */
 654                 return;
 655
 656         num_samples = transfer->actual_length / 2;
 657
 658         sr_dbg("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 659                devc->samp_received + num_samples, devc->framesize);
 660
 661         /*
 662          * The device always sends a full frame, but the beginning of the frame
 663          * doesn't represent the trigger point. The offset at which the trigger
 664          * happened came in with the capture state, so we need to start sending
 665          * from there up the session bus. The samples in the frame buffer
 666          * before that trigger point came after the end of the device's frame
 667          * buffer was reached, and it wrapped around to overwrite up until the
 668          * trigger point.
 669          */
 670         if (devc->samp_received < devc->trigger_offset) {
 671                 /* Trigger point not yet reached. */
 672                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 673                         /* The entire chunk is before the trigger point. */
 674                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 675                                         transfer->buffer, num_samples * 2);
 676                         devc->samp_buffered += num_samples;
 677                 } else {
 678                         /*
 679                          * This chunk hits or overruns the trigger point.
 680                          * Store the part before the trigger fired, and
 681                          * send the rest up to the session bus.
 682                          */
 683                         pre = devc->trigger_offset - devc->samp_received;
 684                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 685                                         transfer->buffer, pre * 2);
 686                         devc->samp_buffered += pre;
 687
 688                         /* The rest of this chunk starts with the trigger point. */
 689                         sr_dbg("Reached trigger point, %d samples buffered.",
 690                                devc->samp_buffered);
 691
 692                         /* Avoid the corner case where the chunk ended at
 693                          * exactly the trigger point. */
 694                         if (num_samples > pre)
 695                                 send_chunk(devc, transfer->buffer + pre * 2,
 696                                                 num_samples - pre);
 697                 }
 698         } else {
 699                 /* Already past the trigger point, just send it all out. */
 700                 send_chunk(devc, transfer->buffer,
 701                                 num_samples);
 702         }
 703
 704         devc->samp_received += num_samples;
 705
 706         /* Everything in this transfer was either copied to the buffer or
 707          * sent to the session bus. */
 708         g_free(transfer->buffer);
 709         libusb_free_transfer(transfer);
 710
 711         if (devc->samp_received >= devc->framesize) {
 712                 /* That was the last chunk in this frame. Send the buffered
 713                  * pre-trigger samples out now, in one big chunk. */
 714                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 715                        devc->samp_buffered);
 716                 send_chunk(devc, devc->framebuf, devc->samp_buffered);
 717
 718                 /* Mark the end of this frame. */
 719                 packet.type = SR_DF_FRAME_END;
 720                 sr_session_send(devc->cb_data, &packet);
 721
 722                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 723                         /* Terminate session */
 724                         devc->dev_state = STOPPING;
 725                 } else {
 726                         devc->dev_state = NEW_CAPTURE;
 727                 }
 728         }
 729 }
 730
 731 static int handle_event(int fd, int revents, void *cb_data)
 732 {
 733         const struct sr_dev_inst *sdi;
 734         struct sr_datafeed_packet packet;
 735         struct timeval tv;
 736         struct dev_context *devc;
 737         struct drv_context *drvc = hdi->priv;
 738         const struct libusb_pollfd **lupfd;
 739         int num_probes, i;
 740         uint32_t trigger_offset;
 741         uint8_t capturestate;
 742
 743         (void)fd;
 744         (void)revents;
 745
 746         sdi = cb_data;
 747         devc = sdi->priv;
 748         if (devc->dev_state == STOPPING) {
 749                 /* We've been told to wind up the acquisition. */
 750                 sr_dbg("Stopping acquisition.");
 751                 /*
 752                  * TODO: Doesn't really cancel pending transfers so they might
 753                  * come in after SR_DF_END is sent.
 754                  */
 755                 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 756                 for (i = 0; lupfd[i]; i++)
 757                         sr_source_remove(lupfd[i]->fd);
 758                 free(lupfd);
 759
 760                 packet.type = SR_DF_END;
 761                 sr_session_send(sdi, &packet);
 762
 763                 devc->dev_state = IDLE;
 764
 765                 return TRUE;
 766         }
 767
 768         /* Always handle pending libusb events. */
 769         tv.tv_sec = tv.tv_usec = 0;
 770         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 771
 772         /* TODO: ugh */
 773         if (devc->dev_state == NEW_CAPTURE) {
 774                 if (dso_capture_start(devc) != SR_OK)
 775                         return TRUE;
 776                 if (dso_enable_trigger(devc) != SR_OK)
 777                         return TRUE;
 778 //              if (dso_force_trigger(devc) != SR_OK)
 779 //                      return TRUE;
 780                 sr_dbg("Successfully requested next chunk.");
 781                 devc->dev_state = CAPTURE;
 782                 return TRUE;
 783         }
 784         if (devc->dev_state != CAPTURE)
 785                 return TRUE;
 786
 787         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 788                 return TRUE;
 789
 790         sr_dbg("Capturestate %d.", capturestate);
 791         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 792         switch (capturestate) {
 793         case CAPTURE_EMPTY:
 794                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 795                         devc->capture_empty_count = 0;
 796                         if (dso_capture_start(devc) != SR_OK)
 797                                 break;
 798                         if (dso_enable_trigger(devc) != SR_OK)
 799                                 break;
 800 //                      if (dso_force_trigger(devc) != SR_OK)
 801 //                              break;
 802                         sr_dbg("Successfully requested next chunk.");
 803                 }
 804                 break;
 805         case CAPTURE_FILLING:
 806                 /* No data yet. */
 807                 break;
 808         case CAPTURE_READY_8BIT:
 809                 /* Remember where in the captured frame the trigger is. */
 810                 devc->trigger_offset = trigger_offset;
 811
 812                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 813                 /* TODO: Check malloc return value. */
 814                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 815                 devc->samp_buffered = devc->samp_received = 0;
 816
 817                 /* Tell the scope to send us the first frame. */
 818                 if (dso_get_channeldata(devc, receive_transfer) != SR_OK)
 819                         break;
 820
 821                 /*
 822                  * Don't hit the state machine again until we're done fetching
 823                  * the data we just told the scope to send.
 824                  */
 825                 devc->dev_state = FETCH_DATA;
 826
 827                 /* Tell the frontend a new frame is on the way. */
 828                 packet.type = SR_DF_FRAME_BEGIN;
 829                 sr_session_send(sdi, &packet);
 830                 break;
 831         case CAPTURE_READY_9BIT:
 832                 /* TODO */
 833                 sr_err("Not yet supported.");
 834                 break;
 835         case CAPTURE_TIMEOUT:
 836                 /* Doesn't matter, we'll try again next time. */
 837                 break;
 838         default:
 839                 sr_dbg("Unknown capture state: %d.", capturestate);
 840                 break;
 841         }
 842
 843         return TRUE;
 844 }
 845
 846 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 847                                     void *cb_data)
 848 {
 849         const struct libusb_pollfd **lupfd;
 850         struct sr_datafeed_packet packet;
 851         struct sr_datafeed_header header;
 852         struct sr_datafeed_meta_analog meta;
 853         struct dev_context *devc;
 854         struct drv_context *drvc = hdi->priv;
 855         int i;
 856
 857         if (sdi->status != SR_ST_ACTIVE)
 858                 return SR_ERR;
 859
 860         devc = sdi->priv;
 861         devc->cb_data = cb_data;
 862
 863         if (configure_probes(sdi) != SR_OK) {
 864                 sr_err("Failed to configure probes.");
 865                 return SR_ERR;
 866         }
 867
 868         if (dso_init(devc) != SR_OK)
 869                 return SR_ERR;
 870
 871         if (dso_capture_start(devc) != SR_OK)
 872                 return SR_ERR;
 873
 874         devc->dev_state = CAPTURE;
 875         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 876         for (i = 0; lupfd[i]; i++)
 877                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 878                               handle_event, (void *)sdi);
 879         free(lupfd);
 880
 881         /* Send header packet to the session bus. */
 882         packet.type = SR_DF_HEADER;
 883         packet.payload = (unsigned char *)&header;
 884         header.feed_version = 1;
 885         gettimeofday(&header.starttime, NULL);
 886         sr_session_send(cb_data, &packet);
 887
 888         /* Send metadata about the SR_DF_ANALOG packets to come. */
 889         packet.type = SR_DF_META_ANALOG;
 890         packet.payload = &meta;
 891         meta.num_probes = NUM_PROBES;
 892         sr_session_send(cb_data, &packet);
 893
 894         return SR_OK;
 895 }
 896
 897 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 898 {
 899         struct dev_context *devc;
 900
 901         (void)cb_data;
 902
 903         if (sdi->status != SR_ST_ACTIVE)
 904                 return SR_ERR;
 905
 906         devc = sdi->priv;
 907         devc->dev_state = STOPPING;
 908
 909         return SR_OK;
 910 }
 911
 912 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 913         .name = "hantek-dso",
 914         .longname = "Hantek DSO",
 915         .api_version = 1,
 916         .init = hw_init,
 917         .cleanup = hw_cleanup,
 918         .scan = hw_scan,
 919         .dev_list = hw_dev_list,
 920         .dev_clear = clear_instances,
 921         .dev_open = hw_dev_open,
 922         .dev_close = hw_dev_close,
 923         .info_get = hw_info_get,
 924         .dev_config_set = hw_dev_config_set,
 925         .dev_acquisition_start = hw_dev_acquisition_start,
 926         .dev_acquisition_stop = hw_dev_acquisition_stop,
 927         .priv = NULL,
 928 };