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 int32_t devopts[] = {
  41         SR_CONF_OSCILLOSCOPE,
  42         SR_CONF_LIMIT_FRAMES,
  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 };
  53
  54 static const char *probe_names[] = {
  55         "CH1", "CH2",
  56         NULL,
  57 };
  58
  59 static const struct dso_profile dev_profiles[] = {
  60         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  61                 "Hantek", "DSO-2090",
  62                 FIRMWARE_DIR "/hantek-dso-2090.fw" },
  63         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  64                 "Hantek", "DSO-2150",
  65                 FIRMWARE_DIR "/hantek-dso-2150.fw" },
  66         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  67                 "Hantek", "DSO-2250",
  68                 FIRMWARE_DIR "/hantek-dso-2250.fw" },
  69         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  70                 "Hantek", "DSO-5200",
  71                 FIRMWARE_DIR "/hantek-dso-5200.fw" },
  72         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  73                 "Hantek", "DSO-5200A",
  74                 FIRMWARE_DIR "/hantek-dso-5200A.fw" },
  75         { 0, 0, 0, 0, 0, 0, 0 },
  76 };
  77
  78 static const uint64_t buffersizes[] = {
  79         10240,
  80         32768,
  81         /* TODO: 65535 */
  82 };
  83
  84 static const uint64_t timebases[][2] = {
  85         /* microseconds */
  86         { 10, 1000000 },
  87         { 20, 1000000 },
  88         { 40, 1000000 },
  89         { 100, 1000000 },
  90         { 200, 1000000 },
  91         { 400, 1000000 },
  92         /* milliseconds */
  93         { 1, 1000 },
  94         { 2, 1000 },
  95         { 4, 1000 },
  96         { 10, 1000 },
  97         { 20, 1000 },
  98         { 40, 1000 },
  99         { 100, 1000 },
 100         { 200, 1000 },
 101         { 400, 1000 },
 102 };
 103
 104 static const uint64_t vdivs[][2] = {
 105         /* millivolts */
 106         { 10, 1000 },
 107         { 20, 1000 },
 108         { 50, 1000 },
 109         { 100, 1000 },
 110         { 200, 1000 },
 111         { 500, 1000 },
 112         /* volts */
 113         { 1, 1 },
 114         { 2, 1 },
 115         { 5, 1 },
 116 };
 117
 118 static const char *trigger_sources[] = {
 119         "CH1",
 120         "CH2",
 121         "EXT",
 122         /* TODO: forced */
 123 };
 124
 125 static const char *filter_targets[] = {
 126         "CH1",
 127         "CH2",
 128         /* TODO: "TRIGGER", */
 129 };
 130
 131 static const char *coupling[] = {
 132         "AC",
 133         "DC",
 134         "GND",
 135 };
 136
 137 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 138 static struct sr_dev_driver *di = &hantek_dso_driver_info;
 139
 140 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 141
 142 static struct sr_dev_inst *dso_dev_new(int index, const struct dso_profile *prof)
 143 {
 144         struct sr_dev_inst *sdi;
 145         struct sr_probe *probe;
 146         struct drv_context *drvc;
 147         struct dev_context *devc;
 148         int i;
 149
 150         sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
 151                 prof->vendor, prof->model, NULL);
 152         if (!sdi)
 153                 return NULL;
 154         sdi->driver = di;
 155
 156         /*
 157          * Add only the real probes -- EXT isn't a source of data, only
 158          * a trigger source internal to the device.
 159          */
 160         for (i = 0; probe_names[i]; i++) {
 161                 if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
 162                                 probe_names[i])))
 163                         return NULL;
 164                 sdi->probes = g_slist_append(sdi->probes, probe);
 165         }
 166
 167         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 168                 sr_err("Device context malloc failed.");
 169                 return NULL;
 170         }
 171
 172         devc->profile = prof;
 173         devc->dev_state = IDLE;
 174         devc->timebase = DEFAULT_TIMEBASE;
 175         devc->ch1_enabled = TRUE;
 176         devc->ch2_enabled = TRUE;
 177         devc->voltage_ch1 = DEFAULT_VOLTAGE;
 178         devc->voltage_ch2 = DEFAULT_VOLTAGE;
 179         devc->coupling_ch1 = DEFAULT_COUPLING;
 180         devc->coupling_ch2 = DEFAULT_COUPLING;
 181         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 182         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 183         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 184         devc->framesize = DEFAULT_FRAMESIZE;
 185         devc->triggerslope = SLOPE_POSITIVE;
 186         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 187         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 188         sdi->priv = devc;
 189         drvc = di->priv;
 190         drvc->instances = g_slist_append(drvc->instances, sdi);
 191
 192         return sdi;
 193 }
 194
 195 static int configure_probes(const struct sr_dev_inst *sdi)
 196 {
 197         struct dev_context *devc;
 198         struct sr_probe *probe;
 199         const GSList *l;
 200         int p;
 201
 202         devc = sdi->priv;
 203
 204         g_slist_free(devc->enabled_probes);
 205         devc->ch1_enabled = devc->ch2_enabled = FALSE;
 206         for (l = sdi->probes, p = 0; l; l = l->next, p++) {
 207                 probe = l->data;
 208                 if (p == 0)
 209                         devc->ch1_enabled = probe->enabled;
 210                 else
 211                         devc->ch2_enabled = probe->enabled;
 212                 if (probe->enabled)
 213                         devc->enabled_probes = g_slist_append(devc->enabled_probes, probe);
 214         }
 215
 216         return SR_OK;
 217 }
 218
 219 /* Properly close and free all devices. */
 220 static int clear_instances(void)
 221 {
 222         struct sr_dev_inst *sdi;
 223         struct drv_context *drvc;
 224         struct dev_context *devc;
 225         GSList *l;
 226
 227         drvc = di->priv;
 228         for (l = drvc->instances; l; l = l->next) {
 229                 if (!(sdi = l->data)) {
 230                         /* Log error, but continue cleaning up the rest. */
 231                         sr_err("%s: sdi was NULL, continuing", __func__);
 232                         continue;
 233                 }
 234                 if (!(devc = sdi->priv)) {
 235                         /* Log error, but continue cleaning up the rest. */
 236                         sr_err("%s: sdi->priv was NULL, continuing", __func__);
 237                         continue;
 238                 }
 239                 dso_close(sdi);
 240                 sr_usb_dev_inst_free(devc->usb);
 241                 g_free(devc->triggersource);
 242                 g_slist_free(devc->enabled_probes);
 243
 244                 sr_dev_inst_free(sdi);
 245         }
 246
 247         g_slist_free(drvc->instances);
 248         drvc->instances = NULL;
 249
 250         return SR_OK;
 251 }
 252
 253 static int hw_init(struct sr_context *sr_ctx)
 254 {
 255         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
 256 }
 257
 258 static GSList *hw_scan(GSList *options)
 259 {
 260         struct sr_dev_inst *sdi;
 261         const struct dso_profile *prof;
 262         struct drv_context *drvc;
 263         struct dev_context *devc;
 264         GSList *devices;
 265         struct libusb_device_descriptor des;
 266         libusb_device **devlist;
 267         int devcnt, ret, i, j;
 268
 269         (void)options;
 270
 271         drvc = di->priv;
 272         drvc->instances = NULL;
 273
 274         devcnt = 0;
 275         devices = 0;
 276
 277         clear_instances();
 278
 279         /* Find all Hantek DSO devices and upload firmware to all of them. */
 280         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 281         for (i = 0; devlist[i]; i++) {
 282                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 283                         sr_err("Failed to get device descriptor: %s.",
 284                                libusb_error_name(ret));
 285                         continue;
 286                 }
 287
 288                 prof = NULL;
 289                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 290                         if (des.idVendor == dev_profiles[j].orig_vid
 291                                 && des.idProduct == dev_profiles[j].orig_pid) {
 292                                 /* Device matches the pre-firmware profile. */
 293                                 prof = &dev_profiles[j];
 294                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 295                                 sdi = dso_dev_new(devcnt, prof);
 296                                 devices = g_slist_append(devices, sdi);
 297                                 devc = sdi->priv;
 298                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 299                                                 prof->firmware) == SR_OK)
 300                                         /* Remember when the firmware on this device was updated */
 301                                         devc->fw_updated = g_get_monotonic_time();
 302                                 else
 303                                         sr_err("Firmware upload failed for "
 304                                                "device %d.", devcnt);
 305                                 /* Dummy USB address of 0xff will get overwritten later. */
 306                                 devc->usb = sr_usb_dev_inst_new(
 307                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 308                                 devcnt++;
 309                                 break;
 310                         } else if (des.idVendor == dev_profiles[j].fw_vid
 311                                 && des.idProduct == dev_profiles[j].fw_pid) {
 312                                 /* Device matches the post-firmware profile. */
 313                                 prof = &dev_profiles[j];
 314                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 315                                 sdi = dso_dev_new(devcnt, prof);
 316                                 sdi->status = SR_ST_INACTIVE;
 317                                 devices = g_slist_append(devices, sdi);
 318                                 devc = sdi->priv;
 319                                 devc->usb = sr_usb_dev_inst_new(
 320                                                 libusb_get_bus_number(devlist[i]),
 321                                                 libusb_get_device_address(devlist[i]), NULL);
 322                                 devcnt++;
 323                                 break;
 324                         }
 325                 }
 326                 if (!prof)
 327                         /* not a supported VID/PID */
 328                         continue;
 329         }
 330         libusb_free_device_list(devlist, 1);
 331
 332         return devices;
 333 }
 334
 335 static GSList *hw_dev_list(void)
 336 {
 337         return ((struct drv_context *)(di->priv))->instances;
 338 }
 339
 340 static int hw_dev_open(struct sr_dev_inst *sdi)
 341 {
 342         struct dev_context *devc;
 343         int64_t timediff_us, timediff_ms;
 344         int err;
 345
 346         devc = sdi->priv;
 347
 348         /*
 349          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 350          * for the FX2 to renumerate.
 351          */
 352         err = SR_ERR;
 353         if (devc->fw_updated > 0) {
 354                 sr_info("Waiting for device to reset.");
 355                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 356                 g_usleep(300 * 1000);
 357                 timediff_ms = 0;
 358                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 359                         if ((err = dso_open(sdi)) == SR_OK)
 360                                 break;
 361                         g_usleep(100 * 1000);
 362                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 363                         timediff_ms = timediff_us / 1000;
 364                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 365                 }
 366                 sr_info("Device came back after %d ms.", timediff_ms);
 367         } else {
 368                 err = dso_open(sdi);
 369         }
 370
 371         if (err != SR_OK) {
 372                 sr_err("Unable to open device.");
 373                 return SR_ERR;
 374         }
 375
 376         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 377         if (err != 0) {
 378                 sr_err("Unable to claim interface: %s.",
 379                        libusb_error_name(err));
 380                 return SR_ERR;
 381         }
 382
 383         return SR_OK;
 384 }
 385
 386 static int hw_dev_close(struct sr_dev_inst *sdi)
 387 {
 388         dso_close(sdi);
 389
 390         return SR_OK;
 391 }
 392
 393 static int hw_cleanup(void)
 394 {
 395         struct drv_context *drvc;
 396
 397         if (!(drvc = di->priv))
 398                 return SR_OK;
 399
 400         clear_instances();
 401
 402         return SR_OK;
 403 }
 404
 405 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
 406 {
 407         struct dev_context *devc;
 408         double tmp_double;
 409         uint64_t tmp_u64, p, q;
 410         int tmp_int, ret;
 411         unsigned int i;
 412         const char *tmp_str;
 413         char **targets;
 414
 415         if (sdi->status != SR_ST_ACTIVE)
 416                 return SR_ERR;
 417
 418         ret = SR_OK;
 419         devc = sdi->priv;
 420         switch (id) {
 421         case SR_CONF_LIMIT_FRAMES:
 422                 devc->limit_frames = g_variant_get_uint64(data);
 423                 break;
 424         case SR_CONF_TRIGGER_SLOPE:
 425                 tmp_u64 = g_variant_get_uint64(data);
 426                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 427                         ret = SR_ERR_ARG;
 428                 devc->triggerslope = tmp_u64;
 429                 break;
 430         case SR_CONF_HORIZ_TRIGGERPOS:
 431                 tmp_double = g_variant_get_double(data);
 432                 if (tmp_double < 0.0 || tmp_double > 1.0) {
 433                         sr_err("Trigger position should be between 0.0 and 1.0.");
 434                         ret = SR_ERR_ARG;
 435                 } else
 436                         devc->triggerposition = tmp_double;
 437                 break;
 438         case SR_CONF_BUFFERSIZE:
 439                 tmp_u64 = g_variant_get_uint64(data);
 440                 for (i = 0; buffersizes[i]; i++) {
 441                         if (buffersizes[i] == tmp_u64) {
 442                                 devc->framesize = tmp_u64;
 443                                 break;
 444                         }
 445                 }
 446                 if (buffersizes[i] == 0)
 447                         ret = SR_ERR_ARG;
 448                 break;
 449         case SR_CONF_TIMEBASE:
 450                 g_variant_get(data, "(tt)", &p, &q);
 451                 tmp_int = -1;
 452                 for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 453                         if (timebases[i][0] == p && timebases[i][1] == q) {
 454                                 tmp_int = i;
 455                                 break;
 456                         }
 457                 }
 458                 if (tmp_int >= 0)
 459                         devc->timebase = tmp_int;
 460                 else
 461                         ret = SR_ERR_ARG;
 462                 break;
 463         case SR_CONF_TRIGGER_SOURCE:
 464                 tmp_str = g_variant_get_string(data, NULL);
 465                 for (i = 0; trigger_sources[i]; i++) {
 466                         if (!strcmp(tmp_str, trigger_sources[i])) {
 467                                 devc->triggersource = g_strdup(tmp_str);
 468                                 break;
 469                         }
 470                 }
 471                 if (trigger_sources[i] == 0)
 472                         ret = SR_ERR_ARG;
 473                 break;
 474         case SR_CONF_FILTER:
 475                 tmp_str = g_variant_get_string(data, NULL);
 476                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 477                 targets = g_strsplit(tmp_str, ",", 0);
 478                 for (i = 0; targets[i]; i++) {
 479                         if (targets[i] == '\0')
 480                                 /* Empty filter string can be used to clear them all. */
 481                                 ;
 482                         else if (!strcmp(targets[i], "CH1"))
 483                                 devc->filter_ch1 = TRUE;
 484                         else if (!strcmp(targets[i], "CH2"))
 485                                 devc->filter_ch2 = TRUE;
 486                         else if (!strcmp(targets[i], "TRIGGER"))
 487                                 devc->filter_trigger = TRUE;
 488                         else {
 489                                 sr_err("Invalid filter target %s.", targets[i]);
 490                                 ret = SR_ERR_ARG;
 491                         }
 492                 }
 493                 g_strfreev(targets);
 494                 break;
 495         case SR_CONF_VDIV:
 496                 /* TODO: Not supporting vdiv per channel yet. */
 497                 g_variant_get(data, "(tt)", &p, &q);
 498                 tmp_int = -1;
 499                 for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 500                         if (vdivs[i][0] == p && vdivs[i][1] == q) {
 501                                 tmp_int = i;
 502                                 break;
 503                         }
 504                 }
 505                 if (tmp_int >= 0) {
 506                         devc->voltage_ch1 = tmp_int;
 507                         devc->voltage_ch2 = tmp_int;
 508                 } else
 509                         ret = SR_ERR_ARG;
 510                 break;
 511         case SR_CONF_COUPLING:
 512                 tmp_str = g_variant_get_string(data, NULL);
 513                 /* TODO: Not supporting coupling per channel yet. */
 514                 for (i = 0; coupling[i]; i++) {
 515                         if (!strcmp(tmp_str, coupling[i])) {
 516                                 devc->coupling_ch1 = i;
 517                                 devc->coupling_ch2 = i;
 518                                 break;
 519                         }
 520                 }
 521                 if (coupling[i] == 0)
 522                         ret = SR_ERR_ARG;
 523                 break;
 524         default:
 525                 ret = SR_ERR_ARG;
 526                 break;
 527         }
 528
 529         return ret;
 530 }
 531
 532 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 533 {
 534
 535         (void)sdi;
 536
 537         switch (key) {
 538         case SR_CONF_DEVICE_OPTIONS:
 539                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 540                                 devopts, ARRAY_SIZE(devopts), sizeof(int32_t));
 541                 break;
 542         case SR_CONF_BUFFERSIZE:
 543                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 544                                 buffersizes, ARRAY_SIZE(buffersizes), sizeof(uint64_t));
 545                 break;
 546         case SR_CONF_COUPLING:
 547                 *data = g_variant_new_strv(coupling, ARRAY_SIZE(coupling));
 548                 break;
 549         case SR_CONF_VDIV:
 550                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 551                                 vdivs, ARRAY_SIZE(vdivs) * 2, sizeof(uint64_t));
 552                 break;
 553         case SR_CONF_FILTER:
 554                 *data = g_variant_new_strv(filter_targets,
 555                                 ARRAY_SIZE(filter_targets));
 556                 break;
 557         case SR_CONF_TIMEBASE:
 558                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 559                                 timebases, ARRAY_SIZE(timebases) * 2, sizeof(uint64_t));
 560                 break;
 561         case SR_CONF_TRIGGER_SOURCE:
 562                 *data = g_variant_new_strv(trigger_sources,
 563                                 ARRAY_SIZE(trigger_sources));
 564                 break;
 565         default:
 566                 return SR_ERR_ARG;
 567         }
 568
 569         return SR_OK;
 570 }
 571
 572 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 573                 int num_samples)
 574 {
 575         struct sr_datafeed_packet packet;
 576         struct sr_datafeed_analog analog;
 577         struct dev_context *devc;
 578         float ch1, ch2, range;
 579         int num_probes, data_offset, i;
 580
 581         devc = sdi->priv;
 582         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 583         packet.type = SR_DF_ANALOG;
 584         packet.payload = &analog;
 585         /* TODO: support for 5xxx series 9-bit samples */
 586         analog.probes = devc->enabled_probes;
 587         analog.num_samples = num_samples;
 588         analog.mq = SR_MQ_VOLTAGE;
 589         analog.unit = SR_UNIT_VOLT;
 590         /* TODO: Check malloc return value. */
 591         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 592         data_offset = 0;
 593         for (i = 0; i < analog.num_samples; i++) {
 594                 /*
 595                  * The device always sends data for both channels. If a channel
 596                  * is disabled, it contains a copy of the enabled channel's
 597                  * data. However, we only send the requested channels to
 598                  * the bus.
 599                  *
 600                  * Voltage values are encoded as a value 0-255 (0-512 on the
 601                  * DSO-5200*), where the value is a point in the range
 602                  * represented by the vdiv setting. There are 8 vertical divs,
 603                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 604                  * and 255 = +2V.
 605                  */
 606                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 607                 if (devc->ch1_enabled) {
 608                         range = ((float)vdivs[devc->voltage_ch1][0] / vdivs[devc->voltage_ch1][1]) * 8;
 609                         ch1 = range / 255 * *(buf + i * 2 + 1);
 610                         /* Value is centered around 0V. */
 611                         ch1 -= range / 2;
 612                         analog.data[data_offset++] = ch1;
 613                 }
 614                 if (devc->ch2_enabled) {
 615                         range = ((float)vdivs[devc->voltage_ch2][0] / vdivs[devc->voltage_ch2][1]) * 8;
 616                         ch2 = range / 255 * *(buf + i * 2);
 617                         ch2 -= range / 2;
 618                         analog.data[data_offset++] = ch2;
 619                 }
 620         }
 621         sr_session_send(devc->cb_data, &packet);
 622 }
 623
 624 /*
 625  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 626  * Only channel data comes in asynchronously, and all transfers for this are
 627  * queued up beforehand, so this just needs to chuck the incoming data onto
 628  * the libsigrok session bus.
 629  */
 630 static void receive_transfer(struct libusb_transfer *transfer)
 631 {
 632         struct sr_datafeed_packet packet;
 633         struct sr_dev_inst *sdi;
 634         struct dev_context *devc;
 635         int num_samples, pre;
 636
 637         sdi = transfer->user_data;
 638         devc = sdi->priv;
 639         sr_dbg("receive_transfer(): status %d received %d bytes.",
 640                transfer->status, transfer->actual_length);
 641
 642         if (transfer->actual_length == 0)
 643                 /* Nothing to send to the bus. */
 644                 return;
 645
 646         num_samples = transfer->actual_length / 2;
 647
 648         sr_dbg("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 649                devc->samp_received + num_samples, devc->framesize);
 650
 651         /*
 652          * The device always sends a full frame, but the beginning of the frame
 653          * doesn't represent the trigger point. The offset at which the trigger
 654          * happened came in with the capture state, so we need to start sending
 655          * from there up the session bus. The samples in the frame buffer
 656          * before that trigger point came after the end of the device's frame
 657          * buffer was reached, and it wrapped around to overwrite up until the
 658          * trigger point.
 659          */
 660         if (devc->samp_received < devc->trigger_offset) {
 661                 /* Trigger point not yet reached. */
 662                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 663                         /* The entire chunk is before the trigger point. */
 664                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 665                                         transfer->buffer, num_samples * 2);
 666                         devc->samp_buffered += num_samples;
 667                 } else {
 668                         /*
 669                          * This chunk hits or overruns the trigger point.
 670                          * Store the part before the trigger fired, and
 671                          * send the rest up to the session bus.
 672                          */
 673                         pre = devc->trigger_offset - devc->samp_received;
 674                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 675                                         transfer->buffer, pre * 2);
 676                         devc->samp_buffered += pre;
 677
 678                         /* The rest of this chunk starts with the trigger point. */
 679                         sr_dbg("Reached trigger point, %d samples buffered.",
 680                                devc->samp_buffered);
 681
 682                         /* Avoid the corner case where the chunk ended at
 683                          * exactly the trigger point. */
 684                         if (num_samples > pre)
 685                                 send_chunk(sdi, transfer->buffer + pre * 2,
 686                                                 num_samples - pre);
 687                 }
 688         } else {
 689                 /* Already past the trigger point, just send it all out. */
 690                 send_chunk(sdi, transfer->buffer,
 691                                 num_samples);
 692         }
 693
 694         devc->samp_received += num_samples;
 695
 696         /* Everything in this transfer was either copied to the buffer or
 697          * sent to the session bus. */
 698         g_free(transfer->buffer);
 699         libusb_free_transfer(transfer);
 700
 701         if (devc->samp_received >= devc->framesize) {
 702                 /* That was the last chunk in this frame. Send the buffered
 703                  * pre-trigger samples out now, in one big chunk. */
 704                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 705                        devc->samp_buffered);
 706                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 707
 708                 /* Mark the end of this frame. */
 709                 packet.type = SR_DF_FRAME_END;
 710                 sr_session_send(devc->cb_data, &packet);
 711
 712                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 713                         /* Terminate session */
 714                         devc->dev_state = STOPPING;
 715                 } else {
 716                         devc->dev_state = NEW_CAPTURE;
 717                 }
 718         }
 719 }
 720
 721 static int handle_event(int fd, int revents, void *cb_data)
 722 {
 723         const struct sr_dev_inst *sdi;
 724         struct sr_datafeed_packet packet;
 725         struct timeval tv;
 726         struct dev_context *devc;
 727         struct drv_context *drvc = di->priv;
 728         const struct libusb_pollfd **lupfd;
 729         int num_probes, i;
 730         uint32_t trigger_offset;
 731         uint8_t capturestate;
 732
 733         (void)fd;
 734         (void)revents;
 735
 736         sdi = cb_data;
 737         devc = sdi->priv;
 738         if (devc->dev_state == STOPPING) {
 739                 /* We've been told to wind up the acquisition. */
 740                 sr_dbg("Stopping acquisition.");
 741                 /*
 742                  * TODO: Doesn't really cancel pending transfers so they might
 743                  * come in after SR_DF_END is sent.
 744                  */
 745                 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 746                 for (i = 0; lupfd[i]; i++)
 747                         sr_source_remove(lupfd[i]->fd);
 748                 free(lupfd);
 749
 750                 packet.type = SR_DF_END;
 751                 sr_session_send(sdi, &packet);
 752
 753                 devc->dev_state = IDLE;
 754
 755                 return TRUE;
 756         }
 757
 758         /* Always handle pending libusb events. */
 759         tv.tv_sec = tv.tv_usec = 0;
 760         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 761
 762         /* TODO: ugh */
 763         if (devc->dev_state == NEW_CAPTURE) {
 764                 if (dso_capture_start(devc) != SR_OK)
 765                         return TRUE;
 766                 if (dso_enable_trigger(devc) != SR_OK)
 767                         return TRUE;
 768 //              if (dso_force_trigger(devc) != SR_OK)
 769 //                      return TRUE;
 770                 sr_dbg("Successfully requested next chunk.");
 771                 devc->dev_state = CAPTURE;
 772                 return TRUE;
 773         }
 774         if (devc->dev_state != CAPTURE)
 775                 return TRUE;
 776
 777         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 778                 return TRUE;
 779
 780         sr_dbg("Capturestate %d.", capturestate);
 781         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 782         switch (capturestate) {
 783         case CAPTURE_EMPTY:
 784                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 785                         devc->capture_empty_count = 0;
 786                         if (dso_capture_start(devc) != SR_OK)
 787                                 break;
 788                         if (dso_enable_trigger(devc) != SR_OK)
 789                                 break;
 790 //                      if (dso_force_trigger(devc) != SR_OK)
 791 //                              break;
 792                         sr_dbg("Successfully requested next chunk.");
 793                 }
 794                 break;
 795         case CAPTURE_FILLING:
 796                 /* No data yet. */
 797                 break;
 798         case CAPTURE_READY_8BIT:
 799                 /* Remember where in the captured frame the trigger is. */
 800                 devc->trigger_offset = trigger_offset;
 801
 802                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 803                 /* TODO: Check malloc return value. */
 804                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 805                 devc->samp_buffered = devc->samp_received = 0;
 806
 807                 /* Tell the scope to send us the first frame. */
 808                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 809                         break;
 810
 811                 /*
 812                  * Don't hit the state machine again until we're done fetching
 813                  * the data we just told the scope to send.
 814                  */
 815                 devc->dev_state = FETCH_DATA;
 816
 817                 /* Tell the frontend a new frame is on the way. */
 818                 packet.type = SR_DF_FRAME_BEGIN;
 819                 sr_session_send(sdi, &packet);
 820                 break;
 821         case CAPTURE_READY_9BIT:
 822                 /* TODO */
 823                 sr_err("Not yet supported.");
 824                 break;
 825         case CAPTURE_TIMEOUT:
 826                 /* Doesn't matter, we'll try again next time. */
 827                 break;
 828         default:
 829                 sr_dbg("Unknown capture state: %d.", capturestate);
 830                 break;
 831         }
 832
 833         return TRUE;
 834 }
 835
 836 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 837                                     void *cb_data)
 838 {
 839         const struct libusb_pollfd **lupfd;
 840         struct dev_context *devc;
 841         struct drv_context *drvc = di->priv;
 842         int i;
 843
 844         if (sdi->status != SR_ST_ACTIVE)
 845                 return SR_ERR;
 846
 847         devc = sdi->priv;
 848         devc->cb_data = cb_data;
 849
 850         if (configure_probes(sdi) != SR_OK) {
 851                 sr_err("Failed to configure probes.");
 852                 return SR_ERR;
 853         }
 854
 855         if (dso_init(devc) != SR_OK)
 856                 return SR_ERR;
 857
 858         if (dso_capture_start(devc) != SR_OK)
 859                 return SR_ERR;
 860
 861         devc->dev_state = CAPTURE;
 862         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 863         for (i = 0; lupfd[i]; i++)
 864                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 865                               handle_event, (void *)sdi);
 866         free(lupfd);
 867
 868         /* Send header packet to the session bus. */
 869         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
 870
 871         return SR_OK;
 872 }
 873
 874 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 875 {
 876         struct dev_context *devc;
 877
 878         (void)cb_data;
 879
 880         if (sdi->status != SR_ST_ACTIVE)
 881                 return SR_ERR;
 882
 883         devc = sdi->priv;
 884         devc->dev_state = STOPPING;
 885
 886         return SR_OK;
 887 }
 888
 889 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 890         .name = "hantek-dso",
 891         .longname = "Hantek DSO",
 892         .api_version = 1,
 893         .init = hw_init,
 894         .cleanup = hw_cleanup,
 895         .scan = hw_scan,
 896         .dev_list = hw_dev_list,
 897         .dev_clear = clear_instances,
 898         .config_get = NULL,
 899         .config_set = config_set,
 900         .config_list = config_list,
 901         .dev_open = hw_dev_open,
 902         .dev_close = hw_dev_close,
 903         .dev_acquisition_start = hw_dev_acquisition_start,
 904         .dev_acquisition_stop = hw_dev_acquisition_stop,
 905         .priv = NULL,
 906 };