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         devcnt = 0;
 289         devices = 0;
 290         drvc = di->priv;
 291         drvc->instances = NULL;
 292
 293         clear_instances();
 294
 295         /* Find all Hantek DSO devices and upload firmware to all of them. */
 296         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 297         for (i = 0; devlist[i]; i++) {
 298                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 299                         sr_err("Failed to get device descriptor: %s.",
 300                                libusb_error_name(ret));
 301                         continue;
 302                 }
 303
 304                 prof = NULL;
 305                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 306                         if (des.idVendor == dev_profiles[j].orig_vid
 307                                 && des.idProduct == dev_profiles[j].orig_pid) {
 308                                 /* Device matches the pre-firmware profile. */
 309                                 prof = &dev_profiles[j];
 310                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 311                                 sdi = dso_dev_new(devcnt, prof);
 312                                 devices = g_slist_append(devices, sdi);
 313                                 devc = sdi->priv;
 314                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 315                                                 prof->firmware) == SR_OK)
 316                                         /* Remember when the firmware on this device was updated */
 317                                         devc->fw_updated = g_get_monotonic_time();
 318                                 else
 319                                         sr_err("Firmware upload failed for "
 320                                                "device %d.", devcnt);
 321                                 /* Dummy USB address of 0xff will get overwritten later. */
 322                                 devc->usb = sr_usb_dev_inst_new(
 323                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 324                                 devcnt++;
 325                                 break;
 326                         } else if (des.idVendor == dev_profiles[j].fw_vid
 327                                 && des.idProduct == dev_profiles[j].fw_pid) {
 328                                 /* Device matches the post-firmware profile. */
 329                                 prof = &dev_profiles[j];
 330                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 331                                 sdi = dso_dev_new(devcnt, prof);
 332                                 sdi->status = SR_ST_INACTIVE;
 333                                 devices = g_slist_append(devices, sdi);
 334                                 devc = sdi->priv;
 335                                 devc->usb = sr_usb_dev_inst_new(
 336                                                 libusb_get_bus_number(devlist[i]),
 337                                                 libusb_get_device_address(devlist[i]), NULL);
 338                                 devcnt++;
 339                                 break;
 340                         }
 341                 }
 342                 if (!prof)
 343                         /* not a supported VID/PID */
 344                         continue;
 345         }
 346         libusb_free_device_list(devlist, 1);
 347
 348         return devices;
 349 }
 350
 351 static GSList *hw_dev_list(void)
 352 {
 353         struct drv_context *drvc;
 354
 355         drvc = di->priv;
 356
 357         return drvc->instances;
 358 }
 359
 360 static int hw_dev_open(struct sr_dev_inst *sdi)
 361 {
 362         struct dev_context *devc;
 363         int64_t timediff_us, timediff_ms;
 364         int err;
 365
 366         devc = sdi->priv;
 367
 368         /*
 369          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 370          * for the FX2 to renumerate.
 371          */
 372         err = SR_ERR;
 373         if (devc->fw_updated > 0) {
 374                 sr_info("Waiting for device to reset.");
 375                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 376                 g_usleep(300 * 1000);
 377                 timediff_ms = 0;
 378                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 379                         if ((err = dso_open(sdi)) == SR_OK)
 380                                 break;
 381                         g_usleep(100 * 1000);
 382                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 383                         timediff_ms = timediff_us / 1000;
 384                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 385                 }
 386                 sr_info("Device came back after %d ms.", timediff_ms);
 387         } else {
 388                 err = dso_open(sdi);
 389         }
 390
 391         if (err != SR_OK) {
 392                 sr_err("Unable to open device.");
 393                 return SR_ERR;
 394         }
 395
 396         err = libusb_claim_interface(devc->usb->devhdl, USB_INTERFACE);
 397         if (err != 0) {
 398                 sr_err("Unable to claim interface: %s.",
 399                        libusb_error_name(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 = di->priv))
 418                 return SR_OK;
 419
 420         clear_instances();
 421
 422         return SR_OK;
 423 }
 424
 425 static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
 426 {
 427         uint64_t tmp;
 428
 429         (void)sdi;
 430
 431         switch (id) {
 432         case SR_DI_HWCAPS:
 433                 *data = hwcaps;
 434                 break;
 435         /* TODO remove this */
 436         case SR_CONF_SAMPLERATE:
 437                 *data = &tmp;
 438                 break;
 439         default:
 440                 return SR_ERR_ARG;
 441         }
 442
 443         return SR_OK;
 444 }
 445
 446 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
 447 {
 448         struct dev_context *devc;
 449         struct sr_rational tmp_rat;
 450         float tmp_float;
 451         uint64_t tmp_u64;
 452         int ret, i;
 453         char **targets;
 454
 455         if (sdi->status != SR_ST_ACTIVE)
 456                 return SR_ERR;
 457
 458         ret = SR_OK;
 459         devc = sdi->priv;
 460         switch (id) {
 461         case SR_CONF_LIMIT_FRAMES:
 462                 devc->limit_frames = *(const uint64_t *)value;
 463                 break;
 464         case SR_CONF_TRIGGER_SLOPE:
 465                 tmp_u64 = *(const int *)value;
 466                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 467                         ret = SR_ERR_ARG;
 468                 devc->triggerslope = tmp_u64;
 469                 break;
 470         case SR_CONF_HORIZ_TRIGGERPOS:
 471                 tmp_float = *(const float *)value;
 472                 if (tmp_float < 0.0 || tmp_float > 1.0) {
 473                         sr_err("Trigger position should be between 0.0 and 1.0.");
 474                         ret = SR_ERR_ARG;
 475                 } else
 476                         devc->triggerposition = tmp_float;
 477                 break;
 478         case SR_CONF_BUFFERSIZE:
 479                 tmp_u64 = *(const int *)value;
 480                 for (i = 0; buffersizes[i]; i++) {
 481                         if (buffersizes[i] == tmp_u64) {
 482                                 devc->framesize = tmp_u64;
 483                                 break;
 484                         }
 485                 }
 486                 if (buffersizes[i] == 0)
 487                         ret = SR_ERR_ARG;
 488                 break;
 489         case SR_CONF_TIMEBASE:
 490                 tmp_rat = *(const struct sr_rational *)value;
 491                 for (i = 0; timebases[i].p && timebases[i].q; i++) {
 492                         if (timebases[i].p == tmp_rat.p
 493                                         && timebases[i].q == tmp_rat.q) {
 494                                 devc->timebase = i;
 495                                 break;
 496                         }
 497                 }
 498                 if (timebases[i].p == 0 && timebases[i].q == 0)
 499                         ret = SR_ERR_ARG;
 500                 break;
 501         case SR_CONF_TRIGGER_SOURCE:
 502                 for (i = 0; trigger_sources[i]; i++) {
 503                         if (!strcmp(value, trigger_sources[i])) {
 504                                 devc->triggersource = g_strdup(value);
 505                                 break;
 506                         }
 507                 }
 508                 if (trigger_sources[i] == 0)
 509                         ret = SR_ERR_ARG;
 510                 break;
 511         case SR_CONF_FILTER:
 512                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 513                 targets = g_strsplit(value, ",", 0);
 514                 for (i = 0; targets[i]; i++) {
 515                         if (targets[i] == '\0')
 516                                 /* Empty filter string can be used to clear them all. */
 517                                 ;
 518                         else if (!strcmp(targets[i], "CH1"))
 519                                 devc->filter_ch1 = TRUE;
 520                         else if (!strcmp(targets[i], "CH2"))
 521                                 devc->filter_ch2 = TRUE;
 522                         else if (!strcmp(targets[i], "TRIGGER"))
 523                                 devc->filter_trigger = TRUE;
 524                         else {
 525                                 sr_err("Invalid filter target %s.", targets[i]);
 526                                 ret = SR_ERR_ARG;
 527                         }
 528                 }
 529                 g_strfreev(targets);
 530                 break;
 531         case SR_CONF_VDIV:
 532                 /* TODO: Not supporting vdiv per channel yet. */
 533                 tmp_rat = *(const struct sr_rational *)value;
 534                 for (i = 0; vdivs[i].p && vdivs[i].q; i++) {
 535                         if (vdivs[i].p == tmp_rat.p
 536                                         && vdivs[i].q == tmp_rat.q) {
 537                                 devc->voltage_ch1 = i;
 538                                 devc->voltage_ch2 = i;
 539                                 break;
 540                         }
 541                 }
 542                 if (vdivs[i].p == 0 && vdivs[i].q == 0)
 543                         ret = SR_ERR_ARG;
 544                 break;
 545         case SR_CONF_COUPLING:
 546                 /* TODO: Not supporting coupling per channel yet. */
 547                 for (i = 0; coupling[i]; i++) {
 548                         if (!strcmp(value, coupling[i])) {
 549                                 devc->coupling_ch1 = i;
 550                                 devc->coupling_ch2 = i;
 551                                 break;
 552                         }
 553                 }
 554                 if (coupling[i] == 0)
 555                         ret = SR_ERR_ARG;
 556                 break;
 557         default:
 558                 ret = SR_ERR_ARG;
 559                 break;
 560         }
 561
 562         return ret;
 563 }
 564
 565 static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
 566 {
 567
 568         (void)sdi;
 569
 570         switch (key) {
 571         case SR_CONF_BUFFERSIZE:
 572                 *data = buffersizes;
 573                 break;
 574         case SR_CONF_COUPLING:
 575                 *data = coupling;
 576                 break;
 577         case SR_CONF_VDIV:
 578                 *data = vdivs;
 579                 break;
 580         case SR_CONF_FILTER:
 581                 *data = filter_targets;
 582                 break;
 583         case SR_CONF_TIMEBASE:
 584                 *data = timebases;
 585                 break;
 586         case SR_CONF_TRIGGER_SOURCE:
 587                 *data = trigger_sources;
 588                 break;
 589         default:
 590                 return SR_ERR_ARG;
 591         }
 592
 593         return SR_OK;
 594 }
 595
 596 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 597                 int num_samples)
 598 {
 599         struct sr_datafeed_packet packet;
 600         struct sr_datafeed_analog analog;
 601         struct dev_context *devc;
 602         float ch1, ch2, range;
 603         int num_probes, data_offset, i;
 604
 605         devc = sdi->priv;
 606         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 607         packet.type = SR_DF_ANALOG;
 608         packet.payload = &analog;
 609         /* TODO: support for 5xxx series 9-bit samples */
 610         analog.probes = devc->enabled_probes;
 611         analog.num_samples = num_samples;
 612         analog.mq = SR_MQ_VOLTAGE;
 613         analog.unit = SR_UNIT_VOLT;
 614         /* TODO: Check malloc return value. */
 615         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 616         data_offset = 0;
 617         for (i = 0; i < analog.num_samples; i++) {
 618                 /*
 619                  * The device always sends data for both channels. If a channel
 620                  * is disabled, it contains a copy of the enabled channel's
 621                  * data. However, we only send the requested channels to
 622                  * the bus.
 623                  *
 624                  * Voltage values are encoded as a value 0-255 (0-512 on the
 625                  * DSO-5200*), where the value is a point in the range
 626                  * represented by the vdiv setting. There are 8 vertical divs,
 627                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 628                  * and 255 = +2V.
 629                  */
 630                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 631                 if (devc->ch1_enabled) {
 632                         range = ((float)vdivs[devc->voltage_ch1].p / vdivs[devc->voltage_ch1].q) * 8;
 633                         ch1 = range / 255 * *(buf + i * 2 + 1);
 634                         /* Value is centered around 0V. */
 635                         ch1 -= range / 2;
 636                         analog.data[data_offset++] = ch1;
 637                 }
 638                 if (devc->ch2_enabled) {
 639                         range = ((float)vdivs[devc->voltage_ch2].p / vdivs[devc->voltage_ch2].q) * 8;
 640                         ch2 = range / 255 * *(buf + i * 2);
 641                         ch2 -= range / 2;
 642                         analog.data[data_offset++] = ch2;
 643                 }
 644         }
 645         sr_session_send(devc->cb_data, &packet);
 646 }
 647
 648 /*
 649  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 650  * Only channel data comes in asynchronously, and all transfers for this are
 651  * queued up beforehand, so this just needs to chuck the incoming data onto
 652  * the libsigrok session bus.
 653  */
 654 static void receive_transfer(struct libusb_transfer *transfer)
 655 {
 656         struct sr_datafeed_packet packet;
 657         struct sr_dev_inst *sdi;
 658         struct dev_context *devc;
 659         int num_samples, pre;
 660
 661         sdi = transfer->user_data;
 662         devc = sdi->priv;
 663         sr_dbg("receive_transfer(): status %d received %d bytes.",
 664                transfer->status, transfer->actual_length);
 665
 666         if (transfer->actual_length == 0)
 667                 /* Nothing to send to the bus. */
 668                 return;
 669
 670         num_samples = transfer->actual_length / 2;
 671
 672         sr_dbg("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 673                devc->samp_received + num_samples, devc->framesize);
 674
 675         /*
 676          * The device always sends a full frame, but the beginning of the frame
 677          * doesn't represent the trigger point. The offset at which the trigger
 678          * happened came in with the capture state, so we need to start sending
 679          * from there up the session bus. The samples in the frame buffer
 680          * before that trigger point came after the end of the device's frame
 681          * buffer was reached, and it wrapped around to overwrite up until the
 682          * trigger point.
 683          */
 684         if (devc->samp_received < devc->trigger_offset) {
 685                 /* Trigger point not yet reached. */
 686                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 687                         /* The entire chunk is before the trigger point. */
 688                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 689                                         transfer->buffer, num_samples * 2);
 690                         devc->samp_buffered += num_samples;
 691                 } else {
 692                         /*
 693                          * This chunk hits or overruns the trigger point.
 694                          * Store the part before the trigger fired, and
 695                          * send the rest up to the session bus.
 696                          */
 697                         pre = devc->trigger_offset - devc->samp_received;
 698                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 699                                         transfer->buffer, pre * 2);
 700                         devc->samp_buffered += pre;
 701
 702                         /* The rest of this chunk starts with the trigger point. */
 703                         sr_dbg("Reached trigger point, %d samples buffered.",
 704                                devc->samp_buffered);
 705
 706                         /* Avoid the corner case where the chunk ended at
 707                          * exactly the trigger point. */
 708                         if (num_samples > pre)
 709                                 send_chunk(sdi, transfer->buffer + pre * 2,
 710                                                 num_samples - pre);
 711                 }
 712         } else {
 713                 /* Already past the trigger point, just send it all out. */
 714                 send_chunk(sdi, transfer->buffer,
 715                                 num_samples);
 716         }
 717
 718         devc->samp_received += num_samples;
 719
 720         /* Everything in this transfer was either copied to the buffer or
 721          * sent to the session bus. */
 722         g_free(transfer->buffer);
 723         libusb_free_transfer(transfer);
 724
 725         if (devc->samp_received >= devc->framesize) {
 726                 /* That was the last chunk in this frame. Send the buffered
 727                  * pre-trigger samples out now, in one big chunk. */
 728                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 729                        devc->samp_buffered);
 730                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 731
 732                 /* Mark the end of this frame. */
 733                 packet.type = SR_DF_FRAME_END;
 734                 sr_session_send(devc->cb_data, &packet);
 735
 736                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 737                         /* Terminate session */
 738                         devc->dev_state = STOPPING;
 739                 } else {
 740                         devc->dev_state = NEW_CAPTURE;
 741                 }
 742         }
 743 }
 744
 745 static int handle_event(int fd, int revents, void *cb_data)
 746 {
 747         const struct sr_dev_inst *sdi;
 748         struct sr_datafeed_packet packet;
 749         struct timeval tv;
 750         struct dev_context *devc;
 751         struct drv_context *drvc = di->priv;
 752         const struct libusb_pollfd **lupfd;
 753         int num_probes, i;
 754         uint32_t trigger_offset;
 755         uint8_t capturestate;
 756
 757         (void)fd;
 758         (void)revents;
 759
 760         sdi = cb_data;
 761         devc = sdi->priv;
 762         if (devc->dev_state == STOPPING) {
 763                 /* We've been told to wind up the acquisition. */
 764                 sr_dbg("Stopping acquisition.");
 765                 /*
 766                  * TODO: Doesn't really cancel pending transfers so they might
 767                  * come in after SR_DF_END is sent.
 768                  */
 769                 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 770                 for (i = 0; lupfd[i]; i++)
 771                         sr_source_remove(lupfd[i]->fd);
 772                 free(lupfd);
 773
 774                 packet.type = SR_DF_END;
 775                 sr_session_send(sdi, &packet);
 776
 777                 devc->dev_state = IDLE;
 778
 779                 return TRUE;
 780         }
 781
 782         /* Always handle pending libusb events. */
 783         tv.tv_sec = tv.tv_usec = 0;
 784         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 785
 786         /* TODO: ugh */
 787         if (devc->dev_state == NEW_CAPTURE) {
 788                 if (dso_capture_start(devc) != SR_OK)
 789                         return TRUE;
 790                 if (dso_enable_trigger(devc) != SR_OK)
 791                         return TRUE;
 792 //              if (dso_force_trigger(devc) != SR_OK)
 793 //                      return TRUE;
 794                 sr_dbg("Successfully requested next chunk.");
 795                 devc->dev_state = CAPTURE;
 796                 return TRUE;
 797         }
 798         if (devc->dev_state != CAPTURE)
 799                 return TRUE;
 800
 801         if ((dso_get_capturestate(devc, &capturestate, &trigger_offset)) != SR_OK)
 802                 return TRUE;
 803
 804         sr_dbg("Capturestate %d.", capturestate);
 805         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 806         switch (capturestate) {
 807         case CAPTURE_EMPTY:
 808                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 809                         devc->capture_empty_count = 0;
 810                         if (dso_capture_start(devc) != SR_OK)
 811                                 break;
 812                         if (dso_enable_trigger(devc) != SR_OK)
 813                                 break;
 814 //                      if (dso_force_trigger(devc) != SR_OK)
 815 //                              break;
 816                         sr_dbg("Successfully requested next chunk.");
 817                 }
 818                 break;
 819         case CAPTURE_FILLING:
 820                 /* No data yet. */
 821                 break;
 822         case CAPTURE_READY_8BIT:
 823                 /* Remember where in the captured frame the trigger is. */
 824                 devc->trigger_offset = trigger_offset;
 825
 826                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 827                 /* TODO: Check malloc return value. */
 828                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 829                 devc->samp_buffered = devc->samp_received = 0;
 830
 831                 /* Tell the scope to send us the first frame. */
 832                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 833                         break;
 834
 835                 /*
 836                  * Don't hit the state machine again until we're done fetching
 837                  * the data we just told the scope to send.
 838                  */
 839                 devc->dev_state = FETCH_DATA;
 840
 841                 /* Tell the frontend a new frame is on the way. */
 842                 packet.type = SR_DF_FRAME_BEGIN;
 843                 sr_session_send(sdi, &packet);
 844                 break;
 845         case CAPTURE_READY_9BIT:
 846                 /* TODO */
 847                 sr_err("Not yet supported.");
 848                 break;
 849         case CAPTURE_TIMEOUT:
 850                 /* Doesn't matter, we'll try again next time. */
 851                 break;
 852         default:
 853                 sr_dbg("Unknown capture state: %d.", capturestate);
 854                 break;
 855         }
 856
 857         return TRUE;
 858 }
 859
 860 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 861                                     void *cb_data)
 862 {
 863         const struct libusb_pollfd **lupfd;
 864         struct sr_datafeed_packet packet;
 865         struct sr_datafeed_header header;
 866         struct dev_context *devc;
 867         struct drv_context *drvc = di->priv;
 868         int i;
 869
 870         if (sdi->status != SR_ST_ACTIVE)
 871                 return SR_ERR;
 872
 873         devc = sdi->priv;
 874         devc->cb_data = cb_data;
 875
 876         if (configure_probes(sdi) != SR_OK) {
 877                 sr_err("Failed to configure probes.");
 878                 return SR_ERR;
 879         }
 880
 881         if (dso_init(devc) != SR_OK)
 882                 return SR_ERR;
 883
 884         if (dso_capture_start(devc) != SR_OK)
 885                 return SR_ERR;
 886
 887         devc->dev_state = CAPTURE;
 888         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 889         for (i = 0; lupfd[i]; i++)
 890                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 891                               handle_event, (void *)sdi);
 892         free(lupfd);
 893
 894         /* Send header packet to the session bus. */
 895         packet.type = SR_DF_HEADER;
 896         packet.payload = (unsigned char *)&header;
 897         header.feed_version = 1;
 898         gettimeofday(&header.starttime, NULL);
 899         sr_session_send(cb_data, &packet);
 900
 901         return SR_OK;
 902 }
 903
 904 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 905 {
 906         struct dev_context *devc;
 907
 908         (void)cb_data;
 909
 910         if (sdi->status != SR_ST_ACTIVE)
 911                 return SR_ERR;
 912
 913         devc = sdi->priv;
 914         devc->dev_state = STOPPING;
 915
 916         return SR_OK;
 917 }
 918
 919 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 920         .name = "hantek-dso",
 921         .longname = "Hantek DSO",
 922         .api_version = 1,
 923         .init = hw_init,
 924         .cleanup = hw_cleanup,
 925         .scan = hw_scan,
 926         .dev_list = hw_dev_list,
 927         .dev_clear = clear_instances,
 928         .config_get = config_get,
 929         .config_set = config_set,
 930         .config_list = config_list,
 931         .dev_open = hw_dev_open,
 932         .dev_close = hw_dev_close,
 933         .dev_acquisition_start = hw_dev_acquisition_start,
 934         .dev_acquisition_stop = hw_dev_acquisition_stop,
 935         .priv = NULL,
 936 };