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