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         if (libusb_init(NULL) != 0) {
 266                 g_free(drvc);
 267                 sr_err("Failed to initialize USB.");
 268                 return SR_ERR;
 269         }
 270
 271         drvc->sr_ctx = sr_ctx;
 272         hdi->priv = drvc;
 273
 274         return SR_OK;
 275 }
 276
 277 static GSList *hw_scan(GSList *options)
 278 {
 279         struct sr_dev_inst *sdi;
 280         const struct dso_profile *prof;
 281         struct drv_context *drvc;
 282         struct dev_context *devc;
 283         GSList *devices;
 284         struct libusb_device_descriptor des;
 285         libusb_device **devlist;
 286         int devcnt, ret, i, j;
 287
 288         (void)options;
 289
 290         devcnt = 0;
 291         devices = 0;
 292         drvc = hdi->priv;
 293         drvc->instances = NULL;
 294
 295         clear_instances();
 296
 297         /* Find all Hantek DSO devices and upload firmware to all of them. */
 298         libusb_get_device_list(NULL, &devlist);
 299         for (i = 0; devlist[i]; i++) {
 300                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 301                         sr_err("Failed to get device descriptor: %d.", ret);
 302                         continue;
 303                 }
 304
 305                 prof = NULL;
 306                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 307                         if (des.idVendor == dev_profiles[j].orig_vid
 308                                 && des.idProduct == dev_profiles[j].orig_pid) {
 309                                 /* Device matches the pre-firmware profile. */
 310                                 prof = &dev_profiles[j];
 311                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 312                                 sdi = dso_dev_new(devcnt, prof);
 313                                 devices = g_slist_append(devices, sdi);
 314                                 devc = sdi->priv;
 315                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 316                                                 prof->firmware) == SR_OK)
 317                                         /* Remember when the firmware on this device was updated */
 318                                         devc->fw_updated = g_get_monotonic_time();
 319                                 else
 320                                         sr_err("Firmware upload failed for "
 321                                                "device %d.", devcnt);
 322                                 /* Dummy USB address of 0xff will get overwritten later. */
 323                                 devc->usb = sr_usb_dev_inst_new(
 324                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 325                                 devcnt++;
 326                                 break;
 327                         } else if (des.idVendor == dev_profiles[j].fw_vid
 328                                 && des.idProduct == dev_profiles[j].fw_pid) {
 329                                 /* Device matches the post-firmware profile. */
 330                                 prof = &dev_profiles[j];
 331                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 332                                 sdi = dso_dev_new(devcnt, prof);
 333                                 sdi->status = SR_ST_INACTIVE;
 334                                 devices = g_slist_append(devices, sdi);
 335                                 devc = sdi->priv;
 336                                 devc->usb = sr_usb_dev_inst_new(
 337                                                 libusb_get_bus_number(devlist[i]),
 338                                                 libusb_get_device_address(devlist[i]), NULL);
 339                                 devcnt++;
 340                                 break;
 341                         }
 342                 }
 343                 if (!prof)
 344                         /* not a supported VID/PID */
 345                         continue;
 346         }
 347         libusb_free_device_list(devlist, 1);
 348
 349         return devices;
 350 }
 351
 352 static GSList *hw_dev_list(void)
 353 {
 354         struct drv_context *drvc;
 355
 356         drvc = hdi->priv;
 357
 358         return drvc->instances;
 359 }
 360
 361 static int hw_dev_open(struct sr_dev_inst *sdi)
 362 {
 363         struct dev_context *devc;
 364         int64_t timediff_us, timediff_ms;
 365         int err;
 366
 367         devc = sdi->priv;
 368
 369         /*
 370          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 371          * for the FX2 to renumerate.
 372          */
 373         err = SR_ERR;
 374         if (devc->fw_updated > 0) {
 375                 sr_info("Waiting for device to reset.");
 376                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 377                 g_usleep(300 * 1000);
 378                 timediff_ms = 0;
 379                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 380                         if ((err = dso_open(sdi)) == SR_OK)
 381                                 break;
 382                         g_usleep(100 * 1000);
 383                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 384                         timediff_ms = timediff_us / 1000;
 385                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 386                 }
 387                 sr_info("Device came back after %d ms.", timediff_ms);
 388         } else {
 389                 err = dso_open(sdi);
 390         }
 391
 392         if (err != SR_OK) {
 393                 sr_err("Unable to open device.");
 394                 return SR_ERR;
 395         }
 396
 397         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 398         if (err != 0) {
 399                 sr_err("Unable to claim interface: %d.", err);
 400                 return SR_ERR;
 401         }
 402
 403         return SR_OK;
 404 }
 405
 406 static int hw_dev_close(struct sr_dev_inst *sdi)
 407 {
 408         dso_close(sdi);
 409
 410         return SR_OK;
 411 }
 412
 413 static int hw_cleanup(void)
 414 {
 415         struct drv_context *drvc;
 416
 417         if (!(drvc = hdi->priv))
 418                 return SR_OK;
 419
 420         clear_instances();
 421
 422         libusb_exit(NULL);
 423
 424         return SR_OK;
 425 }
 426
 427 static int hw_info_get(int info_id, const void **data,
 428                        const struct sr_dev_inst *sdi)
 429 {
 430         uint64_t tmp;
 431
 432         (void)sdi;
 433
 434         switch (info_id) {
 435         case SR_DI_HWCAPS:
 436                 *data = hwcaps;
 437                 break;
 438         case SR_DI_NUM_PROBES:
 439                 *data = GINT_TO_POINTER(NUM_PROBES);
 440                 break;
 441         case SR_DI_PROBE_NAMES:
 442                 *data = probe_names;
 443                 break;
 444         case SR_DI_BUFFERSIZES:
 445                 *data = buffersizes;
 446                 break;
 447         case SR_DI_TIMEBASES:
 448                 *data = timebases;
 449                 break;
 450         case SR_DI_TRIGGER_SOURCES:
 451                 *data = trigger_sources;
 452                 break;
 453         case SR_DI_FILTERS:
 454                 *data = filter_targets;
 455                 break;
 456         case SR_DI_VDIVS:
 457                 *data = vdivs;
 458                 break;
 459         case SR_DI_COUPLING:
 460                 *data = coupling;
 461                 break;
 462         /* TODO remove this */
 463         case SR_DI_CUR_SAMPLERATE:
 464                 *data = &tmp;
 465                 break;
 466         default:
 467                 return SR_ERR_ARG;
 468         }
 469
 470         return SR_OK;
 471 }
 472
 473 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 474                              const void *value)
 475 {
 476         struct dev_context *devc;
 477         struct sr_rational tmp_rat;
 478         float tmp_float;
 479         uint64_t tmp_u64;
 480         int ret, i;
 481         char **targets;
 482
 483         if (sdi->status != SR_ST_ACTIVE)
 484                 return SR_ERR;
 485
 486         ret = SR_OK;
 487         devc = sdi->priv;
 488         switch (hwcap) {
 489         case SR_HWCAP_LIMIT_FRAMES:
 490                 devc->limit_frames = *(const uint64_t *)value;
 491                 break;
 492         case SR_HWCAP_TRIGGER_SLOPE:
 493                 tmp_u64 = *(const int *)value;
 494                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 495                         ret = SR_ERR_ARG;
 496                 devc->triggerslope = tmp_u64;
 497                 break;
 498         case SR_HWCAP_HORIZ_TRIGGERPOS:
 499                 tmp_float = *(const float *)value;
 500                 if (tmp_float < 0.0 || tmp_float > 1.0) {
 501                         sr_err("Trigger position should be between 0.0 and 1.0.");
 502                         ret = SR_ERR_ARG;
 503                 } else
 504                         devc->triggerposition = tmp_float;
 505                 break;
 506         case SR_HWCAP_BUFFERSIZE:
 507                 tmp_u64 = *(const int *)value;
 508                 for (i = 0; buffersizes[i]; i++) {
 509                         if (buffersizes[i] == tmp_u64) {
 510                                 devc->framesize = tmp_u64;
 511                                 break;
 512                         }
 513                 }
 514                 if (buffersizes[i] == 0)
 515                         ret = SR_ERR_ARG;
 516                 break;
 517         case SR_HWCAP_TIMEBASE:
 518                 tmp_rat = *(const struct sr_rational *)value;
 519                 for (i = 0; timebases[i].p && timebases[i].q; i++) {
 520                         if (timebases[i].p == tmp_rat.p
 521                                         && timebases[i].q == tmp_rat.q) {
 522                                 devc->timebase = i;
 523                                 break;
 524                         }
 525                 }
 526                 if (timebases[i].p == 0 && timebases[i].q == 0)
 527                         ret = SR_ERR_ARG;
 528                 break;
 529         case SR_HWCAP_TRIGGER_SOURCE:
 530                 for (i = 0; trigger_sources[i]; i++) {
 531                         if (!strcmp(value, trigger_sources[i])) {
 532                                 devc->triggersource = g_strdup(value);
 533                                 break;
 534                         }
 535                 }
 536                 if (trigger_sources[i] == 0)
 537                         ret = SR_ERR_ARG;
 538                 break;
 539         case SR_HWCAP_FILTER:
 540                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 541                 targets = g_strsplit(value, ",", 0);
 542                 for (i = 0; targets[i]; i++) {
 543                         if (targets[i] == '\0')
 544                                 /* Empty filter string can be used to clear them all. */
 545                                 ;
 546                         else if (!strcmp(targets[i], "CH1"))
 547                                 devc->filter_ch1 = TRUE;
 548                         else if (!strcmp(targets[i], "CH2"))
 549                                 devc->filter_ch2 = TRUE;
 550                         else if (!strcmp(targets[i], "TRIGGER"))
 551                                 devc->filter_trigger = TRUE;
 552                         else {
 553                                 sr_err("Invalid filter target %s.", targets[i]);
 554                                 ret = SR_ERR_ARG;
 555                         }
 556                 }
 557                 g_strfreev(targets);
 558                 break;
 559         case SR_HWCAP_VDIV:
 560                 /* TODO: Not supporting vdiv per channel yet. */
 561                 tmp_rat = *(const struct sr_rational *)value;
 562                 for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
 563                         if (vdivs[i].p == tmp_rat.p
 564                                         && vdivs[i].q == tmp_rat.q) {
 565                                 devc->voltage_ch1 = i;
 566                                 devc->voltage_ch2 = i;
 567                                 break;
 568                         }
 569                 }
 570                 if (vdivs[i].p == 0 && vdivs[i].q == 0)
 571                         ret = SR_ERR_ARG;
 572                 break;
 573         case SR_HWCAP_COUPLING:
 574                 /* TODO: Not supporting coupling per channel yet. */
 575                 for (i = 0; coupling[i]; i++) {
 576                         if (!strcmp(value, coupling[i])) {
 577                                 devc->coupling_ch1 = i;
 578                                 devc->coupling_ch2 = i;
 579                                 break;
 580                         }
 581                 }
 582                 if (coupling[i] == 0)
 583                         ret = SR_ERR_ARG;
 584                 break;
 585         default:
 586                 ret = SR_ERR_ARG;
 587                 break;
 588         }
 589
 590         return ret;
 591 }
 592
 593 static void send_chunk(struct dev_context *devc, unsigned char *buf,
 594                 int num_samples)
 595 {
 596         struct sr_datafeed_packet packet;
 597         struct sr_datafeed_analog analog;
 598         float ch1, ch2, range;
 599         int num_probes, data_offset, i;
 600
 601         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 602         packet.type = SR_DF_ANALOG;
 603         packet.payload = &analog;
 604         /* TODO: support for 5xxx series 9-bit samples */
 605         analog.num_samples = num_samples;
 606         analog.mq = SR_MQ_VOLTAGE;
 607         analog.unit = SR_UNIT_VOLT;
 608         /* TODO: Check malloc return value. */
 609         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 610         data_offset = 0;
 611         for (i = 0; i < analog.num_samples; i++) {
 612                 /*
 613                  * The device always sends data for both channels. If a channel
 614                  * is disabled, it contains a copy of the enabled channel's
 615                  * data. However, we only send the requested channels to
 616                  * the bus.
 617                  *
 618                  * Voltage values are encoded as a value 0-255 (0-512 on the
 619                  * DSO-5200*), where the value is a point in the range
 620                  * represented by the vdiv setting. There are 8 vertical divs,
 621                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 622                  * and 255 = +2V.
 623                  */
 624                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 625                 if (devc->ch1_enabled) {
 626                         range = ((float)vdivs[devc->voltage_ch1].p / vdivs[devc->voltage_ch1].q) * 8;
 627                         ch1 = range / 255 * *(buf + i * 2 + 1);
 628                         /* Value is centered around 0V. */
 629                         ch1 -= range / 2;
 630                         analog.data[data_offset++] = ch1;
 631                 }
 632                 if (devc->ch2_enabled) {
 633                         range = ((float)vdivs[devc->voltage_ch2].p / vdivs[devc->voltage_ch2].q) * 8;
 634                         ch2 = range / 255 * *(buf + i * 2);
 635                         ch2 -= range / 2;
 636                         analog.data[data_offset++] = ch2;
 637                 }
 638         }
 639         sr_session_send(devc->cb_data, &packet);
 640 }
 641
 642 /*
 643  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 644  * Only channel data comes in asynchronously, and all transfers for this are
 645  * queued up beforehand, so this just needs to chuck the incoming data onto
 646  * the libsigrok session bus.
 647  */
 648 static void receive_transfer(struct libusb_transfer *transfer)
 649 {
 650         struct sr_datafeed_packet packet;
 651         struct dev_context *devc;
 652         int num_samples, pre;
 653
 654         devc = transfer->user_data;
 655         sr_dbg("receive_transfer(): status %d received %d bytes.",
 656                transfer->status, transfer->actual_length);
 657
 658         if (transfer->actual_length == 0)
 659                 /* Nothing to send to the bus. */
 660                 return;
 661
 662         num_samples = transfer->actual_length / 2;
 663
 664         sr_dbg("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 665                devc->samp_received + num_samples, devc->framesize);
 666
 667         /*
 668          * The device always sends a full frame, but the beginning of the frame
 669          * doesn't represent the trigger point. The offset at which the trigger
 670          * happened came in with the capture state, so we need to start sending
 671          * from there up the session bus. The samples in the frame buffer
 672          * before that trigger point came after the end of the device's frame
 673          * buffer was reached, and it wrapped around to overwrite up until the
 674          * trigger point.
 675          */
 676         if (devc->samp_received < devc->trigger_offset) {
 677                 /* Trigger point not yet reached. */
 678                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 679                         /* The entire chunk is before the trigger point. */
 680                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 681                                         transfer->buffer, num_samples * 2);
 682                         devc->samp_buffered += num_samples;
 683                 } else {
 684                         /*
 685                          * This chunk hits or overruns the trigger point.
 686                          * Store the part before the trigger fired, and
 687                          * send the rest up to the session bus.
 688                          */
 689                         pre = devc->trigger_offset - devc->samp_received;
 690                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 691                                         transfer->buffer, pre * 2);
 692                         devc->samp_buffered += pre;
 693
 694                         /* The rest of this chunk starts with the trigger point. */
 695                         sr_dbg("Reached trigger point, %d samples buffered.",
 696                                devc->samp_buffered);
 697
 698                         /* Avoid the corner case where the chunk ended at
 699                          * exactly the trigger point. */
 700                         if (num_samples > pre)
 701                                 send_chunk(devc, transfer->buffer + pre * 2,
 702                                                 num_samples - pre);
 703                 }
 704         } else {
 705                 /* Already past the trigger point, just send it all out. */
 706                 send_chunk(devc, transfer->buffer,
 707                                 num_samples);
 708         }
 709
 710         devc->samp_received += num_samples;
 711
 712         /* Everything in this transfer was either copied to the buffer or
 713          * sent to the session bus. */
 714         g_free(transfer->buffer);
 715         libusb_free_transfer(transfer);
 716
 717         if (devc->samp_received >= devc->framesize) {
 718                 /* That was the last chunk in this frame. Send the buffered
 719                  * pre-trigger samples out now, in one big chunk. */
 720                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 721                        devc->samp_buffered);
 722                 send_chunk(devc, devc->framebuf, devc->samp_buffered);
 723
 724                 /* Mark the end of this frame. */
 725                 packet.type = SR_DF_FRAME_END;
 726                 sr_session_send(devc->cb_data, &packet);
 727
 728                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 729                         /* Terminate session */
 730                         devc->dev_state = STOPPING;
 731                 } else {
 732                         devc->dev_state = NEW_CAPTURE;
 733                 }
 734         }
 735 }
 736
 737 static int handle_event(int fd, int revents, void *cb_data)
 738 {
 739         const struct sr_dev_inst *sdi;
 740         struct sr_datafeed_packet packet;
 741         struct timeval tv;
 742         struct dev_context *devc;
 743         const struct libusb_pollfd **lupfd;
 744         int num_probes, i;
 745         uint32_t trigger_offset;
 746         uint8_t capturestate;
 747
 748         (void)fd;
 749         (void)revents;
 750
 751         sdi = cb_data;
 752         devc = sdi->priv;
 753         if (devc->dev_state == STOPPING) {
 754                 /* We've been told to wind up the acquisition. */
 755                 sr_dbg("Stopping acquisition.");
 756                 /*
 757                  * TODO: Doesn't really cancel pending transfers so they might
 758                  * come in after SR_DF_END is sent.
 759                  */
 760                 lupfd = libusb_get_pollfds(NULL);
 761                 for (i = 0; lupfd[i]; i++)
 762                         sr_source_remove(lupfd[i]->fd);
 763                 free(lupfd);
 764
 765                 packet.type = SR_DF_END;
 766                 sr_session_send(sdi, &packet);
 767
 768                 devc->dev_state = IDLE;
 769
 770                 return TRUE;
 771         }
 772
 773         /* Always handle pending libusb events. */
 774         tv.tv_sec = tv.tv_usec = 0;
 775         libusb_handle_events_timeout(NULL, &tv);
 776
 777         /* TODO: ugh */
 778         if (devc->dev_state == NEW_CAPTURE) {
 779                 if (dso_capture_start(devc) != SR_OK)
 780                         return TRUE;
 781                 if (dso_enable_trigger(devc) != SR_OK)
 782                         return TRUE;
 783 //              if (dso_force_trigger(devc) != SR_OK)
 784 //                      return TRUE;
 785                 sr_dbg("Successfully requested next chunk.");
 786                 devc->dev_state = CAPTURE;
 787                 return TRUE;
 788         }
 789         if (devc->dev_state != CAPTURE)
 790                 return TRUE;
 791
 792         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 793                 return TRUE;
 794
 795         sr_dbg("Capturestate %d.", capturestate);
 796         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 797         switch (capturestate) {
 798         case CAPTURE_EMPTY:
 799                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 800                         devc->capture_empty_count = 0;
 801                         if (dso_capture_start(devc) != SR_OK)
 802                                 break;
 803                         if (dso_enable_trigger(devc) != SR_OK)
 804                                 break;
 805 //                      if (dso_force_trigger(devc) != SR_OK)
 806 //                              break;
 807                         sr_dbg("Successfully requested next chunk.");
 808                 }
 809                 break;
 810         case CAPTURE_FILLING:
 811                 /* No data yet. */
 812                 break;
 813         case CAPTURE_READY_8BIT:
 814                 /* Remember where in the captured frame the trigger is. */
 815                 devc->trigger_offset = trigger_offset;
 816
 817                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 818                 /* TODO: Check malloc return value. */
 819                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 820                 devc->samp_buffered = devc->samp_received = 0;
 821
 822                 /* Tell the scope to send us the first frame. */
 823                 if (dso_get_channeldata(devc, receive_transfer) != SR_OK)
 824                         break;
 825
 826                 /*
 827                  * Don't hit the state machine again until we're done fetching
 828                  * the data we just told the scope to send.
 829                  */
 830                 devc->dev_state = FETCH_DATA;
 831
 832                 /* Tell the frontend a new frame is on the way. */
 833                 packet.type = SR_DF_FRAME_BEGIN;
 834                 sr_session_send(sdi, &packet);
 835                 break;
 836         case CAPTURE_READY_9BIT:
 837                 /* TODO */
 838                 sr_err("Not yet supported.");
 839                 break;
 840         case CAPTURE_TIMEOUT:
 841                 /* Doesn't matter, we'll try again next time. */
 842                 break;
 843         default:
 844                 sr_dbg("Unknown capture state: %d.", capturestate);
 845                 break;
 846         }
 847
 848         return TRUE;
 849 }
 850
 851 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 852                                     void *cb_data)
 853 {
 854         const struct libusb_pollfd **lupfd;
 855         struct sr_datafeed_packet packet;
 856         struct sr_datafeed_header header;
 857         struct sr_datafeed_meta_analog meta;
 858         struct dev_context *devc;
 859         int i;
 860
 861         if (sdi->status != SR_ST_ACTIVE)
 862                 return SR_ERR;
 863
 864         devc = sdi->priv;
 865         devc->cb_data = cb_data;
 866
 867         if (configure_probes(sdi) != SR_OK) {
 868                 sr_err("Failed to configure probes.");
 869                 return SR_ERR;
 870         }
 871
 872         if (dso_init(devc) != SR_OK)
 873                 return SR_ERR;
 874
 875         if (dso_capture_start(devc) != SR_OK)
 876                 return SR_ERR;
 877
 878         devc->dev_state = CAPTURE;
 879         lupfd = libusb_get_pollfds(NULL);
 880         for (i = 0; lupfd[i]; i++)
 881                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 882                               handle_event, (void *)sdi);
 883         free(lupfd);
 884
 885         /* Send header packet to the session bus. */
 886         packet.type = SR_DF_HEADER;
 887         packet.payload = (unsigned char *)&header;
 888         header.feed_version = 1;
 889         gettimeofday(&header.starttime, NULL);
 890         sr_session_send(cb_data, &packet);
 891
 892         /* Send metadata about the SR_DF_ANALOG packets to come. */
 893         packet.type = SR_DF_META_ANALOG;
 894         packet.payload = &meta;
 895         meta.num_probes = NUM_PROBES;
 896         sr_session_send(cb_data, &packet);
 897
 898         return SR_OK;
 899 }
 900
 901 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 902 {
 903         struct dev_context *devc;
 904
 905         (void)cb_data;
 906
 907         if (sdi->status != SR_ST_ACTIVE)
 908                 return SR_ERR;
 909
 910         devc = sdi->priv;
 911         devc->dev_state = STOPPING;
 912
 913         return SR_OK;
 914 }
 915
 916 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 917         .name = "hantek-dso",
 918         .longname = "Hantek DSO",
 919         .api_version = 1,
 920         .init = hw_init,
 921         .cleanup = hw_cleanup,
 922         .scan = hw_scan,
 923         .dev_list = hw_dev_list,
 924         .dev_clear = clear_instances,
 925         .dev_open = hw_dev_open,
 926         .dev_close = hw_dev_close,
 927         .info_get = hw_info_get,
 928         .dev_config_set = hw_dev_config_set,
 929         .dev_acquisition_start = hw_dev_acquisition_start,
 930         .dev_acquisition_stop = hw_dev_acquisition_stop,
 931         .priv = NULL,
 932 };