src/hardware/hantek-dso/api.c

   1 /*
   2  * This file is part of the libsigrok 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 #define NUM_TIMEBASE  10
  41 #define NUM_VDIV      8
  42
  43 static const uint32_t scanopts[] = {
  44         SR_CONF_CONN,
  45 };
  46
  47 static const uint32_t devopts[] = {
  48         SR_CONF_OSCILLOSCOPE,
  49         SR_CONF_CONTINUOUS,
  50         SR_CONF_CONN | SR_CONF_GET,
  51         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
  52         SR_CONF_TIMEBASE | SR_CONF_SET | SR_CONF_LIST,
  53         SR_CONF_BUFFERSIZE | SR_CONF_SET | SR_CONF_LIST,
  54         SR_CONF_TRIGGER_SOURCE | SR_CONF_SET | SR_CONF_LIST,
  55         SR_CONF_TRIGGER_SLOPE | SR_CONF_SET,
  56         SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_SET,
  57         SR_CONF_FILTER | SR_CONF_SET | SR_CONF_LIST,
  58         SR_CONF_VDIV | SR_CONF_SET | SR_CONF_LIST,
  59         SR_CONF_COUPLING | SR_CONF_SET | SR_CONF_LIST,
  60         SR_CONF_NUM_TIMEBASE | SR_CONF_GET,
  61         SR_CONF_NUM_VDIV | SR_CONF_GET,
  62 };
  63
  64 static const char *channel_names[] = {
  65         "CH1", "CH2",
  66         NULL,
  67 };
  68
  69 static const uint64_t buffersizes_32k[] = {
  70         10240, 32768,
  71 };
  72 static const uint64_t buffersizes_512k[] = {
  73         10240, 524288,
  74 };
  75 static const uint64_t buffersizes_14k[] = {
  76         10240, 14336,
  77 };
  78
  79 static const struct dso_profile dev_profiles[] = {
  80         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  81                 "Hantek", "DSO-2090",
  82                 buffersizes_32k,
  83                 FIRMWARE_DIR "/hantek-dso-2090.fw" },
  84         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  85                 "Hantek", "DSO-2150",
  86                 buffersizes_32k,
  87                 FIRMWARE_DIR "/hantek-dso-2150.fw" },
  88         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  89                 "Hantek", "DSO-2250",
  90                 buffersizes_512k,
  91                 FIRMWARE_DIR "/hantek-dso-2250.fw" },
  92         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  93                 "Hantek", "DSO-5200",
  94                 buffersizes_14k,
  95                 FIRMWARE_DIR "/hantek-dso-5200.fw" },
  96         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  97                 "Hantek", "DSO-5200A",
  98                 buffersizes_512k,
  99                 FIRMWARE_DIR "/hantek-dso-5200A.fw" },
 100         { 0, 0, 0, 0, 0, 0, 0, 0 },
 101 };
 102
 103 static const uint64_t timebases[][2] = {
 104         /* microseconds */
 105         { 10, 1000000 },
 106         { 20, 1000000 },
 107         { 40, 1000000 },
 108         { 100, 1000000 },
 109         { 200, 1000000 },
 110         { 400, 1000000 },
 111         /* milliseconds */
 112         { 1, 1000 },
 113         { 2, 1000 },
 114         { 4, 1000 },
 115         { 10, 1000 },
 116         { 20, 1000 },
 117         { 40, 1000 },
 118         { 100, 1000 },
 119         { 200, 1000 },
 120         { 400, 1000 },
 121 };
 122
 123 static const uint64_t vdivs[][2] = {
 124         /* millivolts */
 125         { 10, 1000 },
 126         { 20, 1000 },
 127         { 50, 1000 },
 128         { 100, 1000 },
 129         { 200, 1000 },
 130         { 500, 1000 },
 131         /* volts */
 132         { 1, 1 },
 133         { 2, 1 },
 134         { 5, 1 },
 135 };
 136
 137 static const char *trigger_sources[] = {
 138         "CH1",
 139         "CH2",
 140         "EXT",
 141         /* TODO: forced */
 142 };
 143
 144 static const char *filter_targets[] = {
 145         "CH1",
 146         "CH2",
 147         /* TODO: "TRIGGER", */
 148 };
 149
 150 static const char *coupling[] = {
 151         "AC",
 152         "DC",
 153         "GND",
 154 };
 155
 156 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 157 static struct sr_dev_driver *di = &hantek_dso_driver_info;
 158
 159 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 160
 161 static struct sr_dev_inst *dso_dev_new(const struct dso_profile *prof)
 162 {
 163         struct sr_dev_inst *sdi;
 164         struct sr_channel *ch;
 165         struct drv_context *drvc;
 166         struct dev_context *devc;
 167         int i;
 168
 169         sdi = sr_dev_inst_new(SR_ST_INITIALIZING,
 170                 prof->vendor, prof->model, NULL);
 171         if (!sdi)
 172                 return NULL;
 173         sdi->driver = di;
 174
 175         /*
 176          * Add only the real channels -- EXT isn't a source of data, only
 177          * a trigger source internal to the device.
 178          */
 179         for (i = 0; channel_names[i]; i++) {
 180                 if (!(ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE,
 181                                 channel_names[i])))
 182                         return NULL;
 183                 sdi->channels = g_slist_append(sdi->channels, ch);
 184         }
 185
 186         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 187                 sr_err("Device context malloc failed.");
 188                 return NULL;
 189         }
 190
 191         devc->profile = prof;
 192         devc->dev_state = IDLE;
 193         devc->timebase = DEFAULT_TIMEBASE;
 194         devc->ch1_enabled = TRUE;
 195         devc->ch2_enabled = TRUE;
 196         devc->voltage_ch1 = DEFAULT_VOLTAGE;
 197         devc->voltage_ch2 = DEFAULT_VOLTAGE;
 198         devc->coupling_ch1 = DEFAULT_COUPLING;
 199         devc->coupling_ch2 = DEFAULT_COUPLING;
 200         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 201         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 202         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 203         devc->framesize = DEFAULT_FRAMESIZE;
 204         devc->triggerslope = SLOPE_POSITIVE;
 205         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 206         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 207         sdi->priv = devc;
 208         drvc = di->priv;
 209         drvc->instances = g_slist_append(drvc->instances, sdi);
 210
 211         return sdi;
 212 }
 213
 214 static int configure_channels(const struct sr_dev_inst *sdi)
 215 {
 216         struct dev_context *devc;
 217         struct sr_channel *ch;
 218         const GSList *l;
 219         int p;
 220
 221         devc = sdi->priv;
 222
 223         g_slist_free(devc->enabled_channels);
 224         devc->ch1_enabled = devc->ch2_enabled = FALSE;
 225         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 226                 ch = l->data;
 227                 if (p == 0)
 228                         devc->ch1_enabled = ch->enabled;
 229                 else
 230                         devc->ch2_enabled = ch->enabled;
 231                 if (ch->enabled)
 232                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 233         }
 234
 235         return SR_OK;
 236 }
 237
 238 static void clear_dev_context(void *priv)
 239 {
 240         struct dev_context *devc;
 241
 242         devc = priv;
 243         g_free(devc->triggersource);
 244         g_slist_free(devc->enabled_channels);
 245
 246 }
 247
 248 static int dev_clear(void)
 249 {
 250         return std_dev_clear(di, clear_dev_context);
 251 }
 252
 253 static int init(struct sr_context *sr_ctx)
 254 {
 255         return std_init(sr_ctx, di, LOG_PREFIX);
 256 }
 257
 258 static GSList *scan(GSList *options)
 259 {
 260         struct drv_context *drvc;
 261         struct dev_context *devc;
 262         struct sr_dev_inst *sdi;
 263         struct sr_usb_dev_inst *usb;
 264         struct sr_config *src;
 265         const struct dso_profile *prof;
 266         GSList *l, *devices, *conn_devices;
 267         struct libusb_device_descriptor des;
 268         libusb_device **devlist;
 269         int ret, i, j;
 270         const char *conn;
 271         char connection_id[64];
 272
 273         drvc = di->priv;
 274
 275         devices = 0;
 276
 277         conn = NULL;
 278         for (l = options; l; l = l->next) {
 279                 src = l->data;
 280                 if (src->key == SR_CONF_CONN) {
 281                         conn = g_variant_get_string(src->data, NULL);
 282                         break;
 283                 }
 284         }
 285         if (conn)
 286                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 287         else
 288                 conn_devices = NULL;
 289
 290         /* Find all Hantek DSO devices and upload firmware to all of them. */
 291         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 292         for (i = 0; devlist[i]; i++) {
 293                 if (conn) {
 294                         usb = NULL;
 295                         for (l = conn_devices; l; l = l->next) {
 296                                 usb = l->data;
 297                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 298                                         && usb->address == libusb_get_device_address(devlist[i]))
 299                                         break;
 300                         }
 301                         if (!l)
 302                                 /* This device matched none of the ones that
 303                                  * matched the conn specification. */
 304                                 continue;
 305                 }
 306
 307                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 308                         sr_err("Failed to get device descriptor: %s.",
 309                                         libusb_error_name(ret));
 310                         continue;
 311                 }
 312
 313                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 314
 315                 prof = NULL;
 316                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 317                         if (des.idVendor == dev_profiles[j].orig_vid
 318                                 && des.idProduct == dev_profiles[j].orig_pid) {
 319                                 /* Device matches the pre-firmware profile. */
 320                                 prof = &dev_profiles[j];
 321                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 322                                 sdi = dso_dev_new(prof);
 323                                 sdi->connection_id = g_strdup(connection_id);
 324                                 devices = g_slist_append(devices, sdi);
 325                                 devc = sdi->priv;
 326                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 327                                                 prof->firmware) == SR_OK)
 328                                         /* Remember when the firmware on this device was updated */
 329                                         devc->fw_updated = g_get_monotonic_time();
 330                                 else
 331                                         sr_err("Firmware upload failed");
 332                                 /* Dummy USB address of 0xff will get overwritten later. */
 333                                 sdi->conn = sr_usb_dev_inst_new(
 334                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 335                                 break;
 336                         } else if (des.idVendor == dev_profiles[j].fw_vid
 337                                 && des.idProduct == dev_profiles[j].fw_pid) {
 338                                 /* Device matches the post-firmware profile. */
 339                                 prof = &dev_profiles[j];
 340                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 341                                 sdi = dso_dev_new(prof);
 342                                 sdi->connection_id = g_strdup(connection_id);
 343                                 sdi->status = SR_ST_INACTIVE;
 344                                 devices = g_slist_append(devices, sdi);
 345                                 sdi->inst_type = SR_INST_USB;
 346                                 sdi->conn = sr_usb_dev_inst_new(
 347                                                 libusb_get_bus_number(devlist[i]),
 348                                                 libusb_get_device_address(devlist[i]), NULL);
 349                                 break;
 350                         }
 351                 }
 352                 if (!prof)
 353                         /* not a supported VID/PID */
 354                         continue;
 355         }
 356         libusb_free_device_list(devlist, 1);
 357
 358         return devices;
 359 }
 360
 361 static GSList *dev_list(void)
 362 {
 363         return ((struct drv_context *)(di->priv))->instances;
 364 }
 365
 366 static int dev_open(struct sr_dev_inst *sdi)
 367 {
 368         struct dev_context *devc;
 369         struct sr_usb_dev_inst *usb;
 370         int64_t timediff_us, timediff_ms;
 371         int err;
 372
 373         devc = sdi->priv;
 374         usb = sdi->conn;
 375
 376         /*
 377          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 378          * for the FX2 to renumerate.
 379          */
 380         err = SR_ERR;
 381         if (devc->fw_updated > 0) {
 382                 sr_info("Waiting for device to reset.");
 383                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 384                 g_usleep(300 * 1000);
 385                 timediff_ms = 0;
 386                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 387                         if ((err = dso_open(sdi)) == SR_OK)
 388                                 break;
 389                         g_usleep(100 * 1000);
 390                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 391                         timediff_ms = timediff_us / 1000;
 392                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 393                 }
 394                 sr_info("Device came back after %d ms.", timediff_ms);
 395         } else {
 396                 err = dso_open(sdi);
 397         }
 398
 399         if (err != SR_OK) {
 400                 sr_err("Unable to open device.");
 401                 return SR_ERR;
 402         }
 403
 404         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 405         if (err != 0) {
 406                 sr_err("Unable to claim interface: %s.",
 407                            libusb_error_name(err));
 408                 return SR_ERR;
 409         }
 410
 411         return SR_OK;
 412 }
 413
 414 static int dev_close(struct sr_dev_inst *sdi)
 415 {
 416         dso_close(sdi);
 417
 418         return SR_OK;
 419 }
 420
 421 static int cleanup(void)
 422 {
 423         return dev_clear();
 424 }
 425
 426 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 427                 const struct sr_channel_group *cg)
 428 {
 429         struct sr_usb_dev_inst *usb;
 430         char str[128];
 431
 432         (void)cg;
 433
 434         switch (key) {
 435         case SR_CONF_CONN:
 436                 if (!sdi || !sdi->conn)
 437                         return SR_ERR_ARG;
 438                 usb = sdi->conn;
 439                 if (usb->address == 255)
 440                         /* Device still needs to re-enumerate after firmware
 441                          * upload, so we don't know its (future) address. */
 442                         return SR_ERR;
 443                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 444                 *data = g_variant_new_string(str);
 445                 break;
 446         case SR_CONF_NUM_TIMEBASE:
 447                 *data = g_variant_new_int32(NUM_TIMEBASE);
 448                 break;
 449         case SR_CONF_NUM_VDIV:
 450                 *data = g_variant_new_int32(NUM_VDIV);
 451                 break;
 452         default:
 453                 return SR_ERR_NA;
 454         }
 455
 456         return SR_OK;
 457 }
 458
 459 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 460                 const struct sr_channel_group *cg)
 461 {
 462         struct dev_context *devc;
 463         double tmp_double;
 464         uint64_t tmp_u64, p, q;
 465         int tmp_int, ret;
 466         unsigned int i;
 467         const char *tmp_str;
 468         char **targets;
 469
 470         (void)cg;
 471
 472         if (sdi->status != SR_ST_ACTIVE)
 473                 return SR_ERR_DEV_CLOSED;
 474
 475         ret = SR_OK;
 476         devc = sdi->priv;
 477         switch (key) {
 478         case SR_CONF_LIMIT_FRAMES:
 479                 devc->limit_frames = g_variant_get_uint64(data);
 480                 break;
 481         case SR_CONF_TRIGGER_SLOPE:
 482                 tmp_str = g_variant_get_string(data, NULL);
 483                 if (!tmp_str || !(tmp_str[0] == 'f' || tmp_str[0] == 'r'))
 484                         return SR_ERR_ARG;
 485                 devc->triggerslope = (tmp_str[0] == 'r')
 486                         ? SLOPE_POSITIVE : SLOPE_NEGATIVE;
 487                 break;
 488         case SR_CONF_HORIZ_TRIGGERPOS:
 489                 tmp_double = g_variant_get_double(data);
 490                 if (tmp_double < 0.0 || tmp_double > 1.0) {
 491                         sr_err("Trigger position should be between 0.0 and 1.0.");
 492                         ret = SR_ERR_ARG;
 493                 } else
 494                         devc->triggerposition = tmp_double;
 495                 break;
 496         case SR_CONF_BUFFERSIZE:
 497                 tmp_u64 = g_variant_get_uint64(data);
 498                 for (i = 0; i < 2; i++) {
 499                         if (devc->profile->buffersizes[i] == tmp_u64) {
 500                                 devc->framesize = tmp_u64;
 501                                 break;
 502                         }
 503                 }
 504                 if (i == 2)
 505                         ret = SR_ERR_ARG;
 506                 break;
 507         case SR_CONF_TIMEBASE:
 508                 g_variant_get(data, "(tt)", &p, &q);
 509                 tmp_int = -1;
 510                 for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 511                         if (timebases[i][0] == p && timebases[i][1] == q) {
 512                                 tmp_int = i;
 513                                 break;
 514                         }
 515                 }
 516                 if (tmp_int >= 0)
 517                         devc->timebase = tmp_int;
 518                 else
 519                         ret = SR_ERR_ARG;
 520                 break;
 521         case SR_CONF_TRIGGER_SOURCE:
 522                 tmp_str = g_variant_get_string(data, NULL);
 523                 for (i = 0; trigger_sources[i]; i++) {
 524                         if (!strcmp(tmp_str, trigger_sources[i])) {
 525                                 devc->triggersource = g_strdup(tmp_str);
 526                                 break;
 527                         }
 528                 }
 529                 if (trigger_sources[i] == 0)
 530                         ret = SR_ERR_ARG;
 531                 break;
 532         case SR_CONF_FILTER:
 533                 tmp_str = g_variant_get_string(data, NULL);
 534                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 535                 targets = g_strsplit(tmp_str, ",", 0);
 536                 for (i = 0; targets[i]; i++) {
 537                         if (targets[i] == '\0')
 538                                 /* Empty filter string can be used to clear them all. */
 539                                 ;
 540                         else if (!strcmp(targets[i], "CH1"))
 541                                 devc->filter_ch1 = TRUE;
 542                         else if (!strcmp(targets[i], "CH2"))
 543                                 devc->filter_ch2 = TRUE;
 544                         else if (!strcmp(targets[i], "TRIGGER"))
 545                                 devc->filter_trigger = TRUE;
 546                         else {
 547                                 sr_err("Invalid filter target %s.", targets[i]);
 548                                 ret = SR_ERR_ARG;
 549                         }
 550                 }
 551                 g_strfreev(targets);
 552                 break;
 553         case SR_CONF_VDIV:
 554                 /* TODO: Not supporting vdiv per channel yet. */
 555                 g_variant_get(data, "(tt)", &p, &q);
 556                 tmp_int = -1;
 557                 for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 558                         if (vdivs[i][0] == p && vdivs[i][1] == q) {
 559                                 tmp_int = i;
 560                                 break;
 561                         }
 562                 }
 563                 if (tmp_int >= 0) {
 564                         devc->voltage_ch1 = tmp_int;
 565                         devc->voltage_ch2 = tmp_int;
 566                 } else
 567                         ret = SR_ERR_ARG;
 568                 break;
 569         case SR_CONF_COUPLING:
 570                 tmp_str = g_variant_get_string(data, NULL);
 571                 /* TODO: Not supporting coupling per channel yet. */
 572                 for (i = 0; coupling[i]; i++) {
 573                         if (!strcmp(tmp_str, coupling[i])) {
 574                                 devc->coupling_ch1 = i;
 575                                 devc->coupling_ch2 = i;
 576                                 break;
 577                         }
 578                 }
 579                 if (coupling[i] == 0)
 580                         ret = SR_ERR_ARG;
 581                 break;
 582         default:
 583                 ret = SR_ERR_NA;
 584                 break;
 585         }
 586
 587         return ret;
 588 }
 589
 590 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 591                 const struct sr_channel_group *cg)
 592 {
 593         struct dev_context *devc;
 594         GVariant *tuple, *rational[2];
 595         GVariantBuilder gvb;
 596         unsigned int i;
 597
 598         (void)cg;
 599
 600         switch (key) {
 601         case SR_CONF_SCAN_OPTIONS:
 602                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 603                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 604                 break;
 605         case SR_CONF_DEVICE_OPTIONS:
 606                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 607                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 608                 break;
 609         case SR_CONF_BUFFERSIZE:
 610                 if (!sdi)
 611                         return SR_ERR_ARG;
 612                 devc = sdi->priv;
 613                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 614                                 devc->profile->buffersizes, 2, sizeof(uint64_t));
 615                 break;
 616         case SR_CONF_COUPLING:
 617                 *data = g_variant_new_strv(coupling, ARRAY_SIZE(coupling));
 618                 break;
 619         case SR_CONF_VDIV:
 620                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 621                 for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 622                         rational[0] = g_variant_new_uint64(vdivs[i][0]);
 623                         rational[1] = g_variant_new_uint64(vdivs[i][1]);
 624                         tuple = g_variant_new_tuple(rational, 2);
 625                         g_variant_builder_add_value(&gvb, tuple);
 626                 }
 627                 *data = g_variant_builder_end(&gvb);
 628                 break;
 629         case SR_CONF_FILTER:
 630                 *data = g_variant_new_strv(filter_targets,
 631                                 ARRAY_SIZE(filter_targets));
 632                 break;
 633         case SR_CONF_TIMEBASE:
 634                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 635                 for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 636                         rational[0] = g_variant_new_uint64(timebases[i][0]);
 637                         rational[1] = g_variant_new_uint64(timebases[i][1]);
 638                         tuple = g_variant_new_tuple(rational, 2);
 639                         g_variant_builder_add_value(&gvb, tuple);
 640                 }
 641                 *data = g_variant_builder_end(&gvb);
 642                 break;
 643         case SR_CONF_TRIGGER_SOURCE:
 644                 *data = g_variant_new_strv(trigger_sources,
 645                                 ARRAY_SIZE(trigger_sources));
 646                 break;
 647         default:
 648                 return SR_ERR_NA;
 649         }
 650
 651         return SR_OK;
 652 }
 653
 654 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 655                 int num_samples)
 656 {
 657         struct sr_datafeed_packet packet;
 658         struct sr_datafeed_analog analog;
 659         struct dev_context *devc;
 660         float ch1, ch2, range;
 661         int num_channels, data_offset, i;
 662
 663         devc = sdi->priv;
 664         num_channels = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 665         packet.type = SR_DF_ANALOG;
 666         packet.payload = &analog;
 667         /* TODO: support for 5xxx series 9-bit samples */
 668         analog.channels = devc->enabled_channels;
 669         analog.num_samples = num_samples;
 670         analog.mq = SR_MQ_VOLTAGE;
 671         analog.unit = SR_UNIT_VOLT;
 672         analog.mqflags = 0;
 673         /* TODO: Check malloc return value. */
 674         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_channels);
 675         data_offset = 0;
 676         for (i = 0; i < analog.num_samples; i++) {
 677                 /*
 678                  * The device always sends data for both channels. If a channel
 679                  * is disabled, it contains a copy of the enabled channel's
 680                  * data. However, we only send the requested channels to
 681                  * the bus.
 682                  *
 683                  * Voltage values are encoded as a value 0-255 (0-512 on the
 684                  * DSO-5200*), where the value is a point in the range
 685                  * represented by the vdiv setting. There are 8 vertical divs,
 686                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 687                  * and 255 = +2V.
 688                  */
 689                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 690                 if (devc->ch1_enabled) {
 691                         range = ((float)vdivs[devc->voltage_ch1][0] / vdivs[devc->voltage_ch1][1]) * 8;
 692                         ch1 = range / 255 * *(buf + i * 2 + 1);
 693                         /* Value is centered around 0V. */
 694                         ch1 -= range / 2;
 695                         analog.data[data_offset++] = ch1;
 696                 }
 697                 if (devc->ch2_enabled) {
 698                         range = ((float)vdivs[devc->voltage_ch2][0] / vdivs[devc->voltage_ch2][1]) * 8;
 699                         ch2 = range / 255 * *(buf + i * 2);
 700                         ch2 -= range / 2;
 701                         analog.data[data_offset++] = ch2;
 702                 }
 703         }
 704         sr_session_send(devc->cb_data, &packet);
 705 }
 706
 707 /*
 708  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 709  * Only channel data comes in asynchronously, and all transfers for this are
 710  * queued up beforehand, so this just needs to chuck the incoming data onto
 711  * the libsigrok session bus.
 712  */
 713 static void receive_transfer(struct libusb_transfer *transfer)
 714 {
 715         struct sr_datafeed_packet packet;
 716         struct sr_dev_inst *sdi;
 717         struct dev_context *devc;
 718         int num_samples, pre;
 719
 720         sdi = transfer->user_data;
 721         devc = sdi->priv;
 722         sr_spew("receive_transfer(): status %d received %d bytes.",
 723                    transfer->status, transfer->actual_length);
 724
 725         if (transfer->actual_length == 0)
 726                 /* Nothing to send to the bus. */
 727                 return;
 728
 729         num_samples = transfer->actual_length / 2;
 730
 731         sr_spew("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 732                    devc->samp_received + num_samples, devc->framesize);
 733
 734         /*
 735          * The device always sends a full frame, but the beginning of the frame
 736          * doesn't represent the trigger point. The offset at which the trigger
 737          * happened came in with the capture state, so we need to start sending
 738          * from there up the session bus. The samples in the frame buffer
 739          * before that trigger point came after the end of the device's frame
 740          * buffer was reached, and it wrapped around to overwrite up until the
 741          * trigger point.
 742          */
 743         if (devc->samp_received < devc->trigger_offset) {
 744                 /* Trigger point not yet reached. */
 745                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 746                         /* The entire chunk is before the trigger point. */
 747                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 748                                         transfer->buffer, num_samples * 2);
 749                         devc->samp_buffered += num_samples;
 750                 } else {
 751                         /*
 752                          * This chunk hits or overruns the trigger point.
 753                          * Store the part before the trigger fired, and
 754                          * send the rest up to the session bus.
 755                          */
 756                         pre = devc->trigger_offset - devc->samp_received;
 757                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 758                                         transfer->buffer, pre * 2);
 759                         devc->samp_buffered += pre;
 760
 761                         /* The rest of this chunk starts with the trigger point. */
 762                         sr_dbg("Reached trigger point, %d samples buffered.",
 763                                    devc->samp_buffered);
 764
 765                         /* Avoid the corner case where the chunk ended at
 766                          * exactly the trigger point. */
 767                         if (num_samples > pre)
 768                                 send_chunk(sdi, transfer->buffer + pre * 2,
 769                                                 num_samples - pre);
 770                 }
 771         } else {
 772                 /* Already past the trigger point, just send it all out. */
 773                 send_chunk(sdi, transfer->buffer,
 774                                 num_samples);
 775         }
 776
 777         devc->samp_received += num_samples;
 778
 779         /* Everything in this transfer was either copied to the buffer or
 780          * sent to the session bus. */
 781         g_free(transfer->buffer);
 782         libusb_free_transfer(transfer);
 783
 784         if (devc->samp_received >= devc->framesize) {
 785                 /* That was the last chunk in this frame. Send the buffered
 786                  * pre-trigger samples out now, in one big chunk. */
 787                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 788                            devc->samp_buffered);
 789                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 790
 791                 /* Mark the end of this frame. */
 792                 packet.type = SR_DF_FRAME_END;
 793                 sr_session_send(devc->cb_data, &packet);
 794
 795                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 796                         /* Terminate session */
 797                         devc->dev_state = STOPPING;
 798                 } else {
 799                         devc->dev_state = NEW_CAPTURE;
 800                 }
 801         }
 802 }
 803
 804 static int handle_event(int fd, int revents, void *cb_data)
 805 {
 806         const struct sr_dev_inst *sdi;
 807         struct sr_datafeed_packet packet;
 808         struct timeval tv;
 809         struct dev_context *devc;
 810         struct drv_context *drvc = di->priv;
 811         int num_channels;
 812         uint32_t trigger_offset;
 813         uint8_t capturestate;
 814
 815         (void)fd;
 816         (void)revents;
 817
 818         sdi = cb_data;
 819         devc = sdi->priv;
 820         if (devc->dev_state == STOPPING) {
 821                 /* We've been told to wind up the acquisition. */
 822                 sr_dbg("Stopping acquisition.");
 823                 /*
 824                  * TODO: Doesn't really cancel pending transfers so they might
 825                  * come in after SR_DF_END is sent.
 826                  */
 827                 usb_source_remove(sdi->session, drvc->sr_ctx);
 828
 829                 packet.type = SR_DF_END;
 830                 sr_session_send(sdi, &packet);
 831
 832                 devc->dev_state = IDLE;
 833
 834                 return TRUE;
 835         }
 836
 837         /* Always handle pending libusb events. */
 838         tv.tv_sec = tv.tv_usec = 0;
 839         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 840
 841         /* TODO: ugh */
 842         if (devc->dev_state == NEW_CAPTURE) {
 843                 if (dso_capture_start(sdi) != SR_OK)
 844                         return TRUE;
 845                 if (dso_enable_trigger(sdi) != SR_OK)
 846                         return TRUE;
 847 //              if (dso_force_trigger(sdi) != SR_OK)
 848 //                      return TRUE;
 849                 sr_dbg("Successfully requested next chunk.");
 850                 devc->dev_state = CAPTURE;
 851                 return TRUE;
 852         }
 853         if (devc->dev_state != CAPTURE)
 854                 return TRUE;
 855
 856         if ((dso_get_capturestate(sdi, &capturestate, &trigger_offset)) != SR_OK)
 857                 return TRUE;
 858
 859         sr_dbg("Capturestate %d.", capturestate);
 860         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 861         switch (capturestate) {
 862         case CAPTURE_EMPTY:
 863                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 864                         devc->capture_empty_count = 0;
 865                         if (dso_capture_start(sdi) != SR_OK)
 866                                 break;
 867                         if (dso_enable_trigger(sdi) != SR_OK)
 868                                 break;
 869 //                      if (dso_force_trigger(sdi) != SR_OK)
 870 //                              break;
 871                         sr_dbg("Successfully requested next chunk.");
 872                 }
 873                 break;
 874         case CAPTURE_FILLING:
 875                 /* No data yet. */
 876                 break;
 877         case CAPTURE_READY_8BIT:
 878                 /* Remember where in the captured frame the trigger is. */
 879                 devc->trigger_offset = trigger_offset;
 880
 881                 num_channels = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 882                 /* TODO: Check malloc return value. */
 883                 devc->framebuf = g_try_malloc(devc->framesize * num_channels * 2);
 884                 devc->samp_buffered = devc->samp_received = 0;
 885
 886                 /* Tell the scope to send us the first frame. */
 887                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 888                         break;
 889
 890                 /*
 891                  * Don't hit the state machine again until we're done fetching
 892                  * the data we just told the scope to send.
 893                  */
 894                 devc->dev_state = FETCH_DATA;
 895
 896                 /* Tell the frontend a new frame is on the way. */
 897                 packet.type = SR_DF_FRAME_BEGIN;
 898                 sr_session_send(sdi, &packet);
 899                 break;
 900         case CAPTURE_READY_9BIT:
 901                 /* TODO */
 902                 sr_err("Not yet supported.");
 903                 break;
 904         case CAPTURE_TIMEOUT:
 905                 /* Doesn't matter, we'll try again next time. */
 906                 break;
 907         default:
 908                 sr_dbg("Unknown capture state: %d.", capturestate);
 909                 break;
 910         }
 911
 912         return TRUE;
 913 }
 914
 915 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 916 {
 917         struct dev_context *devc;
 918         struct drv_context *drvc = di->priv;
 919
 920         if (sdi->status != SR_ST_ACTIVE)
 921                 return SR_ERR_DEV_CLOSED;
 922
 923         devc = sdi->priv;
 924         devc->cb_data = cb_data;
 925
 926         if (configure_channels(sdi) != SR_OK) {
 927                 sr_err("Failed to configure channels.");
 928                 return SR_ERR;
 929         }
 930
 931         if (dso_init(sdi) != SR_OK)
 932                 return SR_ERR;
 933
 934         if (dso_capture_start(sdi) != SR_OK)
 935                 return SR_ERR;
 936
 937         devc->dev_state = CAPTURE;
 938         usb_source_add(sdi->session, drvc->sr_ctx, TICK, handle_event, (void *)sdi);
 939
 940         /* Send header packet to the session bus. */
 941         std_session_send_df_header(cb_data, LOG_PREFIX);
 942
 943         return SR_OK;
 944 }
 945
 946 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 947 {
 948         struct dev_context *devc;
 949
 950         (void)cb_data;
 951
 952         if (sdi->status != SR_ST_ACTIVE)
 953                 return SR_ERR;
 954
 955         devc = sdi->priv;
 956         devc->dev_state = STOPPING;
 957
 958         return SR_OK;
 959 }
 960
 961 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 962         .name = "hantek-dso",
 963         .longname = "Hantek DSO",
 964         .api_version = 1,
 965         .init = init,
 966         .cleanup = cleanup,
 967         .scan = scan,
 968         .dev_list = dev_list,
 969         .dev_clear = dev_clear,
 970         .config_get = config_get,
 971         .config_set = config_set,
 972         .config_list = config_list,
 973         .dev_open = dev_open,
 974         .dev_close = dev_close,
 975         .dev_acquisition_start = dev_acquisition_start,
 976         .dev_acquisition_stop = dev_acquisition_stop,
 977         .priv = NULL,
 978 };