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 int32_t scanopts[] = {
  44         SR_CONF_CONN,
  45 };
  46
  47 static const int32_t devopts[] = {
  48         SR_CONF_OSCILLOSCOPE,
  49         SR_CONF_LIMIT_FRAMES,
  50         SR_CONF_CONTINUOUS,
  51         SR_CONF_TIMEBASE,
  52         SR_CONF_BUFFERSIZE,
  53         SR_CONF_TRIGGER_SOURCE,
  54         SR_CONF_TRIGGER_SLOPE,
  55         SR_CONF_HORIZ_TRIGGERPOS,
  56         SR_CONF_FILTER,
  57         SR_CONF_VDIV,
  58         SR_CONF_COUPLING,
  59         SR_CONF_NUM_TIMEBASE,
  60         SR_CONF_NUM_VDIV,
  61 };
  62
  63 static const char *probe_names[] = {
  64         "CH1", "CH2",
  65         NULL,
  66 };
  67
  68 static const uint64_t buffersizes_32k[] = {
  69         10240, 32768,
  70 };
  71 static const uint64_t buffersizes_512k[] = {
  72         10240, 524288,
  73 };
  74 static const uint64_t buffersizes_14k[] = {
  75         10240, 14336,
  76 };
  77
  78 static const struct dso_profile dev_profiles[] = {
  79         {       0x04b4, 0x2090, 0x04b5, 0x2090,
  80                 "Hantek", "DSO-2090",
  81                 buffersizes_32k,
  82                 FIRMWARE_DIR "/hantek-dso-2090.fw" },
  83         {       0x04b4, 0x2150, 0x04b5, 0x2150,
  84                 "Hantek", "DSO-2150",
  85                 buffersizes_32k,
  86                 FIRMWARE_DIR "/hantek-dso-2150.fw" },
  87         {       0x04b4, 0x2250, 0x04b5, 0x2250,
  88                 "Hantek", "DSO-2250",
  89                 buffersizes_512k,
  90                 FIRMWARE_DIR "/hantek-dso-2250.fw" },
  91         {       0x04b4, 0x5200, 0x04b5, 0x5200,
  92                 "Hantek", "DSO-5200",
  93                 buffersizes_14k,
  94                 FIRMWARE_DIR "/hantek-dso-5200.fw" },
  95         {       0x04b4, 0x520a, 0x04b5, 0x520a,
  96                 "Hantek", "DSO-5200A",
  97                 buffersizes_512k,
  98                 FIRMWARE_DIR "/hantek-dso-5200A.fw" },
  99         { 0, 0, 0, 0, 0, 0, 0, 0 },
 100 };
 101
 102 static const uint64_t timebases[][2] = {
 103         /* microseconds */
 104         { 10, 1000000 },
 105         { 20, 1000000 },
 106         { 40, 1000000 },
 107         { 100, 1000000 },
 108         { 200, 1000000 },
 109         { 400, 1000000 },
 110         /* milliseconds */
 111         { 1, 1000 },
 112         { 2, 1000 },
 113         { 4, 1000 },
 114         { 10, 1000 },
 115         { 20, 1000 },
 116         { 40, 1000 },
 117         { 100, 1000 },
 118         { 200, 1000 },
 119         { 400, 1000 },
 120 };
 121
 122 static const uint64_t vdivs[][2] = {
 123         /* millivolts */
 124         { 10, 1000 },
 125         { 20, 1000 },
 126         { 50, 1000 },
 127         { 100, 1000 },
 128         { 200, 1000 },
 129         { 500, 1000 },
 130         /* volts */
 131         { 1, 1 },
 132         { 2, 1 },
 133         { 5, 1 },
 134 };
 135
 136 static const char *trigger_sources[] = {
 137         "CH1",
 138         "CH2",
 139         "EXT",
 140         /* TODO: forced */
 141 };
 142
 143 static const char *filter_targets[] = {
 144         "CH1",
 145         "CH2",
 146         /* TODO: "TRIGGER", */
 147 };
 148
 149 static const char *coupling[] = {
 150         "AC",
 151         "DC",
 152         "GND",
 153 };
 154
 155 SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 156 static struct sr_dev_driver *di = &hantek_dso_driver_info;
 157
 158 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 159
 160 static struct sr_dev_inst *dso_dev_new(int index, const struct dso_profile *prof)
 161 {
 162         struct sr_dev_inst *sdi;
 163         struct sr_probe *probe;
 164         struct drv_context *drvc;
 165         struct dev_context *devc;
 166         int i;
 167
 168         sdi = sr_dev_inst_new(index, SR_ST_INITIALIZING,
 169                 prof->vendor, prof->model, NULL);
 170         if (!sdi)
 171                 return NULL;
 172         sdi->driver = di;
 173
 174         /*
 175          * Add only the real probes -- EXT isn't a source of data, only
 176          * a trigger source internal to the device.
 177          */
 178         for (i = 0; probe_names[i]; i++) {
 179                 if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
 180                                 probe_names[i])))
 181                         return NULL;
 182                 sdi->probes = g_slist_append(sdi->probes, probe);
 183         }
 184
 185         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 186                 sr_err("Device context malloc failed.");
 187                 return NULL;
 188         }
 189
 190         devc->profile = prof;
 191         devc->dev_state = IDLE;
 192         devc->timebase = DEFAULT_TIMEBASE;
 193         devc->ch1_enabled = TRUE;
 194         devc->ch2_enabled = TRUE;
 195         devc->voltage_ch1 = DEFAULT_VOLTAGE;
 196         devc->voltage_ch2 = DEFAULT_VOLTAGE;
 197         devc->coupling_ch1 = DEFAULT_COUPLING;
 198         devc->coupling_ch2 = DEFAULT_COUPLING;
 199         devc->voffset_ch1 = DEFAULT_VERT_OFFSET;
 200         devc->voffset_ch2 = DEFAULT_VERT_OFFSET;
 201         devc->voffset_trigger = DEFAULT_VERT_TRIGGERPOS;
 202         devc->framesize = DEFAULT_FRAMESIZE;
 203         devc->triggerslope = SLOPE_POSITIVE;
 204         devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
 205         devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
 206         sdi->priv = devc;
 207         drvc = di->priv;
 208         drvc->instances = g_slist_append(drvc->instances, sdi);
 209
 210         return sdi;
 211 }
 212
 213 static int configure_probes(const struct sr_dev_inst *sdi)
 214 {
 215         struct dev_context *devc;
 216         struct sr_probe *probe;
 217         const GSList *l;
 218         int p;
 219
 220         devc = sdi->priv;
 221
 222         g_slist_free(devc->enabled_probes);
 223         devc->ch1_enabled = devc->ch2_enabled = FALSE;
 224         for (l = sdi->probes, p = 0; l; l = l->next, p++) {
 225                 probe = l->data;
 226                 if (p == 0)
 227                         devc->ch1_enabled = probe->enabled;
 228                 else
 229                         devc->ch2_enabled = probe->enabled;
 230                 if (probe->enabled)
 231                         devc->enabled_probes = g_slist_append(devc->enabled_probes, probe);
 232         }
 233
 234         return SR_OK;
 235 }
 236
 237 static void clear_dev_context(void *priv)
 238 {
 239         struct dev_context *devc;
 240
 241         devc = priv;
 242         g_free(devc->triggersource);
 243         g_slist_free(devc->enabled_probes);
 244
 245 }
 246
 247 static int clear_instances(void)
 248 {
 249         return std_dev_clear(di, clear_dev_context);
 250 }
 251
 252 static int hw_init(struct sr_context *sr_ctx)
 253 {
 254         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
 255 }
 256
 257 static GSList *hw_scan(GSList *options)
 258 {
 259         struct drv_context *drvc;
 260         struct dev_context *devc;
 261         struct sr_dev_inst *sdi;
 262     struct sr_usb_dev_inst *usb;
 263     struct sr_config *src;
 264         const struct dso_profile *prof;
 265         GSList *l, *devices, *conn_devices;
 266         struct libusb_device_descriptor des;
 267         libusb_device **devlist;
 268         int devcnt, ret, i, j;
 269     const char *conn;
 270
 271         drvc = di->priv;
 272         drvc->instances = NULL;
 273
 274         devcnt = 0;
 275         devices = 0;
 276
 277         clear_instances();
 278
 279         conn = NULL;
 280         for (l = options; l; l = l->next) {
 281                 src = l->data;
 282                 if (src->key == SR_CONF_CONN) {
 283                         conn = g_variant_get_string(src->data, NULL);
 284                         break;
 285                 }
 286         }
 287         if (conn)
 288                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 289         else
 290                 conn_devices = NULL;
 291
 292         /* Find all Hantek DSO devices and upload firmware to all of them. */
 293         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 294         for (i = 0; devlist[i]; i++) {
 295         if (conn) {
 296                         usb = NULL;
 297                         for (l = conn_devices; l; l = l->next) {
 298                                 usb = l->data;
 299                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 300                                         && usb->address == libusb_get_device_address(devlist[i]))
 301                                         break;
 302                         }
 303                         if (!l)
 304                                 /* This device matched none of the ones that
 305                                  * matched the conn specification. */
 306                                 continue;
 307         }
 308
 309                 if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 310                         sr_err("Failed to get device descriptor: %s.",
 311                                libusb_error_name(ret));
 312                         continue;
 313                 }
 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(devcnt, prof);
 323                                 devices = g_slist_append(devices, sdi);
 324                                 devc = sdi->priv;
 325                                 if (ezusb_upload_firmware(devlist[i], USB_CONFIGURATION,
 326                                                 prof->firmware) == SR_OK)
 327                                         /* Remember when the firmware on this device was updated */
 328                                         devc->fw_updated = g_get_monotonic_time();
 329                                 else
 330                                         sr_err("Firmware upload failed for "
 331                                                "device %d.", devcnt);
 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                                 devcnt++;
 336                                 break;
 337                         } else if (des.idVendor == dev_profiles[j].fw_vid
 338                                 && des.idProduct == dev_profiles[j].fw_pid) {
 339                                 /* Device matches the post-firmware profile. */
 340                                 prof = &dev_profiles[j];
 341                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 342                                 sdi = dso_dev_new(devcnt, prof);
 343                                 sdi->status = SR_ST_INACTIVE;
 344                                 devices = g_slist_append(devices, sdi);
 345                                 devc = sdi->priv;
 346                                 sdi->inst_type = SR_INST_USB;
 347                                 sdi->conn = sr_usb_dev_inst_new(
 348                                                 libusb_get_bus_number(devlist[i]),
 349                                                 libusb_get_device_address(devlist[i]), NULL);
 350                                 devcnt++;
 351                                 break;
 352                         }
 353                 }
 354                 if (!prof)
 355                         /* not a supported VID/PID */
 356                         continue;
 357         }
 358         libusb_free_device_list(devlist, 1);
 359
 360         return devices;
 361 }
 362
 363 static GSList *hw_dev_list(void)
 364 {
 365         return ((struct drv_context *)(di->priv))->instances;
 366 }
 367
 368 static int hw_dev_open(struct sr_dev_inst *sdi)
 369 {
 370         struct dev_context *devc;
 371         struct sr_usb_dev_inst *usb;
 372         int64_t timediff_us, timediff_ms;
 373         int err;
 374
 375         devc = sdi->priv;
 376         usb = sdi->conn;
 377
 378         /*
 379          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 380          * for the FX2 to renumerate.
 381          */
 382         err = SR_ERR;
 383         if (devc->fw_updated > 0) {
 384                 sr_info("Waiting for device to reset.");
 385                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 386                 g_usleep(300 * 1000);
 387                 timediff_ms = 0;
 388                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 389                         if ((err = dso_open(sdi)) == SR_OK)
 390                                 break;
 391                         g_usleep(100 * 1000);
 392                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 393                         timediff_ms = timediff_us / 1000;
 394                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 395                 }
 396                 sr_info("Device came back after %d ms.", timediff_ms);
 397         } else {
 398                 err = dso_open(sdi);
 399         }
 400
 401         if (err != SR_OK) {
 402                 sr_err("Unable to open device.");
 403                 return SR_ERR;
 404         }
 405
 406         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 407         if (err != 0) {
 408                 sr_err("Unable to claim interface: %s.",
 409                        libusb_error_name(err));
 410                 return SR_ERR;
 411         }
 412
 413         return SR_OK;
 414 }
 415
 416 static int hw_dev_close(struct sr_dev_inst *sdi)
 417 {
 418         dso_close(sdi);
 419
 420         return SR_OK;
 421 }
 422
 423 static int hw_cleanup(void)
 424 {
 425         struct drv_context *drvc;
 426
 427         if (!(drvc = di->priv))
 428                 return SR_OK;
 429
 430         clear_instances();
 431
 432         return SR_OK;
 433 }
 434
 435 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
 436 {
 437         struct sr_usb_dev_inst *usb;
 438         char str[128];
 439
 440         switch (id) {
 441         case SR_CONF_CONN:
 442                 if (!sdi || !sdi->conn)
 443                         return SR_ERR_ARG;
 444                 usb = sdi->conn;
 445                 if (usb->address == 255)
 446                         /* Device still needs to re-enumerate after firmware
 447                          * upload, so we don't know its (future) address. */
 448                         return SR_ERR;
 449                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 450                 *data = g_variant_new_string(str);
 451                 break;
 452         case SR_CONF_NUM_TIMEBASE:
 453                 *data = g_variant_new_int32(NUM_TIMEBASE);
 454                 break;
 455         case SR_CONF_NUM_VDIV:
 456                 *data = g_variant_new_int32(NUM_VDIV);
 457                 break;
 458         default:
 459                 return SR_ERR_NA;
 460         }
 461
 462         return SR_OK;
 463 }
 464
 465 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
 466 {
 467         struct dev_context *devc;
 468         double tmp_double;
 469         uint64_t tmp_u64, p, q;
 470         int tmp_int, ret;
 471         unsigned int i;
 472         const char *tmp_str;
 473         char **targets;
 474
 475         if (sdi->status != SR_ST_ACTIVE)
 476                 return SR_ERR;
 477
 478         ret = SR_OK;
 479         devc = sdi->priv;
 480         switch (id) {
 481         case SR_CONF_LIMIT_FRAMES:
 482                 devc->limit_frames = g_variant_get_uint64(data);
 483                 break;
 484         case SR_CONF_TRIGGER_SLOPE:
 485                 tmp_u64 = g_variant_get_uint64(data);
 486                 if (tmp_u64 != SLOPE_NEGATIVE && tmp_u64 != SLOPE_POSITIVE)
 487                         ret = SR_ERR_ARG;
 488                 devc->triggerslope = tmp_u64;
 489                 break;
 490         case SR_CONF_HORIZ_TRIGGERPOS:
 491                 tmp_double = g_variant_get_double(data);
 492                 if (tmp_double < 0.0 || tmp_double > 1.0) {
 493                         sr_err("Trigger position should be between 0.0 and 1.0.");
 494                         ret = SR_ERR_ARG;
 495                 } else
 496                         devc->triggerposition = tmp_double;
 497                 break;
 498         case SR_CONF_BUFFERSIZE:
 499                 tmp_u64 = g_variant_get_uint64(data);
 500                 for (i = 0; i < 2; i++) {
 501                         if (devc->profile->buffersizes[i] == tmp_u64) {
 502                                 devc->framesize = tmp_u64;
 503                                 break;
 504                         }
 505                 }
 506                 if (i == 2)
 507                         ret = SR_ERR_ARG;
 508                 break;
 509         case SR_CONF_TIMEBASE:
 510                 g_variant_get(data, "(tt)", &p, &q);
 511                 tmp_int = -1;
 512                 for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 513                         if (timebases[i][0] == p && timebases[i][1] == q) {
 514                                 tmp_int = i;
 515                                 break;
 516                         }
 517                 }
 518                 if (tmp_int >= 0)
 519                         devc->timebase = tmp_int;
 520                 else
 521                         ret = SR_ERR_ARG;
 522                 break;
 523         case SR_CONF_TRIGGER_SOURCE:
 524                 tmp_str = g_variant_get_string(data, NULL);
 525                 for (i = 0; trigger_sources[i]; i++) {
 526                         if (!strcmp(tmp_str, trigger_sources[i])) {
 527                                 devc->triggersource = g_strdup(tmp_str);
 528                                 break;
 529                         }
 530                 }
 531                 if (trigger_sources[i] == 0)
 532                         ret = SR_ERR_ARG;
 533                 break;
 534         case SR_CONF_FILTER:
 535                 tmp_str = g_variant_get_string(data, NULL);
 536                 devc->filter_ch1 = devc->filter_ch2 = devc->filter_trigger = 0;
 537                 targets = g_strsplit(tmp_str, ",", 0);
 538                 for (i = 0; targets[i]; i++) {
 539                         if (targets[i] == '\0')
 540                                 /* Empty filter string can be used to clear them all. */
 541                                 ;
 542                         else if (!strcmp(targets[i], "CH1"))
 543                                 devc->filter_ch1 = TRUE;
 544                         else if (!strcmp(targets[i], "CH2"))
 545                                 devc->filter_ch2 = TRUE;
 546                         else if (!strcmp(targets[i], "TRIGGER"))
 547                                 devc->filter_trigger = TRUE;
 548                         else {
 549                                 sr_err("Invalid filter target %s.", targets[i]);
 550                                 ret = SR_ERR_ARG;
 551                         }
 552                 }
 553                 g_strfreev(targets);
 554                 break;
 555         case SR_CONF_VDIV:
 556                 /* TODO: Not supporting vdiv per channel yet. */
 557                 g_variant_get(data, "(tt)", &p, &q);
 558                 tmp_int = -1;
 559                 for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 560                         if (vdivs[i][0] == p && vdivs[i][1] == q) {
 561                                 tmp_int = i;
 562                                 break;
 563                         }
 564                 }
 565                 if (tmp_int >= 0) {
 566                         devc->voltage_ch1 = tmp_int;
 567                         devc->voltage_ch2 = tmp_int;
 568                 } else
 569                         ret = SR_ERR_ARG;
 570                 break;
 571         case SR_CONF_COUPLING:
 572                 tmp_str = g_variant_get_string(data, NULL);
 573                 /* TODO: Not supporting coupling per channel yet. */
 574                 for (i = 0; coupling[i]; i++) {
 575                         if (!strcmp(tmp_str, coupling[i])) {
 576                                 devc->coupling_ch1 = i;
 577                                 devc->coupling_ch2 = i;
 578                                 break;
 579                         }
 580                 }
 581                 if (coupling[i] == 0)
 582                         ret = SR_ERR_ARG;
 583                 break;
 584         default:
 585                 ret = SR_ERR_NA;
 586                 break;
 587         }
 588
 589         return ret;
 590 }
 591
 592 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 593 {
 594         struct dev_context *devc;
 595         GVariant *tuple, *rational[2];
 596         GVariantBuilder gvb;
 597         unsigned int i;
 598
 599         (void)sdi;
 600
 601         if (!sdi)
 602                 return SR_ERR_ARG;
 603
 604         devc = sdi->priv;
 605         switch (key) {
 606         case SR_CONF_SCAN_OPTIONS:
 607                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 608                                 scanopts, ARRAY_SIZE(scanopts), sizeof(int32_t));
 609                 break;
 610         case SR_CONF_DEVICE_OPTIONS:
 611                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 612                                 devopts, ARRAY_SIZE(devopts), sizeof(int32_t));
 613                 break;
 614         case SR_CONF_BUFFERSIZE:
 615                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 616                                 devc->profile->buffersizes, 2, sizeof(uint64_t));
 617                 break;
 618         case SR_CONF_COUPLING:
 619                 *data = g_variant_new_strv(coupling, ARRAY_SIZE(coupling));
 620                 break;
 621         case SR_CONF_VDIV:
 622                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 623                 for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 624                         rational[0] = g_variant_new_uint64(vdivs[i][0]);
 625                         rational[1] = g_variant_new_uint64(vdivs[i][1]);
 626                         tuple = g_variant_new_tuple(rational, 2);
 627                         g_variant_builder_add_value(&gvb, tuple);
 628                 }
 629                 *data = g_variant_builder_end(&gvb);
 630                 break;
 631         case SR_CONF_FILTER:
 632                 *data = g_variant_new_strv(filter_targets,
 633                                 ARRAY_SIZE(filter_targets));
 634                 break;
 635         case SR_CONF_TIMEBASE:
 636                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 637                 for (i = 0; i < ARRAY_SIZE(timebases); i++) {
 638                         rational[0] = g_variant_new_uint64(timebases[i][0]);
 639                         rational[1] = g_variant_new_uint64(timebases[i][1]);
 640                         tuple = g_variant_new_tuple(rational, 2);
 641                         g_variant_builder_add_value(&gvb, tuple);
 642                 }
 643                 *data = g_variant_builder_end(&gvb);
 644                 break;
 645         case SR_CONF_TRIGGER_SOURCE:
 646                 *data = g_variant_new_strv(trigger_sources,
 647                                 ARRAY_SIZE(trigger_sources));
 648                 break;
 649         default:
 650                 return SR_ERR_NA;
 651         }
 652
 653         return SR_OK;
 654 }
 655
 656 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 657                 int num_samples)
 658 {
 659         struct sr_datafeed_packet packet;
 660         struct sr_datafeed_analog analog;
 661         struct dev_context *devc;
 662         float ch1, ch2, range;
 663         int num_probes, data_offset, i;
 664
 665         devc = sdi->priv;
 666         num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 667         packet.type = SR_DF_ANALOG;
 668         packet.payload = &analog;
 669         /* TODO: support for 5xxx series 9-bit samples */
 670         analog.probes = devc->enabled_probes;
 671         analog.num_samples = num_samples;
 672         analog.mq = SR_MQ_VOLTAGE;
 673         analog.unit = SR_UNIT_VOLT;
 674         /* TODO: Check malloc return value. */
 675         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_probes);
 676         data_offset = 0;
 677         for (i = 0; i < analog.num_samples; i++) {
 678                 /*
 679                  * The device always sends data for both channels. If a channel
 680                  * is disabled, it contains a copy of the enabled channel's
 681                  * data. However, we only send the requested channels to
 682                  * the bus.
 683                  *
 684                  * Voltage values are encoded as a value 0-255 (0-512 on the
 685                  * DSO-5200*), where the value is a point in the range
 686                  * represented by the vdiv setting. There are 8 vertical divs,
 687                  * so e.g. 500mV/div represents 4V peak-to-peak where 0 = -2V
 688                  * and 255 = +2V.
 689                  */
 690                 /* TODO: Support for DSO-5xxx series 9-bit samples. */
 691                 if (devc->ch1_enabled) {
 692                         range = ((float)vdivs[devc->voltage_ch1][0] / vdivs[devc->voltage_ch1][1]) * 8;
 693                         ch1 = range / 255 * *(buf + i * 2 + 1);
 694                         /* Value is centered around 0V. */
 695                         ch1 -= range / 2;
 696                         analog.data[data_offset++] = ch1;
 697                 }
 698                 if (devc->ch2_enabled) {
 699                         range = ((float)vdivs[devc->voltage_ch2][0] / vdivs[devc->voltage_ch2][1]) * 8;
 700                         ch2 = range / 255 * *(buf + i * 2);
 701                         ch2 -= range / 2;
 702                         analog.data[data_offset++] = ch2;
 703                 }
 704         }
 705         sr_session_send(devc->cb_data, &packet);
 706 }
 707
 708 /*
 709  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 710  * Only channel data comes in asynchronously, and all transfers for this are
 711  * queued up beforehand, so this just needs to chuck the incoming data onto
 712  * the libsigrok session bus.
 713  */
 714 static void receive_transfer(struct libusb_transfer *transfer)
 715 {
 716         struct sr_datafeed_packet packet;
 717         struct sr_dev_inst *sdi;
 718         struct dev_context *devc;
 719         int num_samples, pre;
 720
 721         sdi = transfer->user_data;
 722         devc = sdi->priv;
 723         sr_spew("receive_transfer(): status %d received %d bytes.",
 724                transfer->status, transfer->actual_length);
 725
 726         if (transfer->actual_length == 0)
 727                 /* Nothing to send to the bus. */
 728                 return;
 729
 730         num_samples = transfer->actual_length / 2;
 731
 732         sr_spew("Got %d-%d/%d samples in frame.", devc->samp_received + 1,
 733                devc->samp_received + num_samples, devc->framesize);
 734
 735         /*
 736          * The device always sends a full frame, but the beginning of the frame
 737          * doesn't represent the trigger point. The offset at which the trigger
 738          * happened came in with the capture state, so we need to start sending
 739          * from there up the session bus. The samples in the frame buffer
 740          * before that trigger point came after the end of the device's frame
 741          * buffer was reached, and it wrapped around to overwrite up until the
 742          * trigger point.
 743          */
 744         if (devc->samp_received < devc->trigger_offset) {
 745                 /* Trigger point not yet reached. */
 746                 if (devc->samp_received + num_samples < devc->trigger_offset) {
 747                         /* The entire chunk is before the trigger point. */
 748                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 749                                         transfer->buffer, num_samples * 2);
 750                         devc->samp_buffered += num_samples;
 751                 } else {
 752                         /*
 753                          * This chunk hits or overruns the trigger point.
 754                          * Store the part before the trigger fired, and
 755                          * send the rest up to the session bus.
 756                          */
 757                         pre = devc->trigger_offset - devc->samp_received;
 758                         memcpy(devc->framebuf + devc->samp_buffered * 2,
 759                                         transfer->buffer, pre * 2);
 760                         devc->samp_buffered += pre;
 761
 762                         /* The rest of this chunk starts with the trigger point. */
 763                         sr_dbg("Reached trigger point, %d samples buffered.",
 764                                devc->samp_buffered);
 765
 766                         /* Avoid the corner case where the chunk ended at
 767                          * exactly the trigger point. */
 768                         if (num_samples > pre)
 769                                 send_chunk(sdi, transfer->buffer + pre * 2,
 770                                                 num_samples - pre);
 771                 }
 772         } else {
 773                 /* Already past the trigger point, just send it all out. */
 774                 send_chunk(sdi, transfer->buffer,
 775                                 num_samples);
 776         }
 777
 778         devc->samp_received += num_samples;
 779
 780         /* Everything in this transfer was either copied to the buffer or
 781          * sent to the session bus. */
 782         g_free(transfer->buffer);
 783         libusb_free_transfer(transfer);
 784
 785         if (devc->samp_received >= devc->framesize) {
 786                 /* That was the last chunk in this frame. Send the buffered
 787                  * pre-trigger samples out now, in one big chunk. */
 788                 sr_dbg("End of frame, sending %d pre-trigger buffered samples.",
 789                        devc->samp_buffered);
 790                 send_chunk(sdi, devc->framebuf, devc->samp_buffered);
 791
 792                 /* Mark the end of this frame. */
 793                 packet.type = SR_DF_FRAME_END;
 794                 sr_session_send(devc->cb_data, &packet);
 795
 796                 if (devc->limit_frames && ++devc->num_frames == devc->limit_frames) {
 797                         /* Terminate session */
 798                         devc->dev_state = STOPPING;
 799                 } else {
 800                         devc->dev_state = NEW_CAPTURE;
 801                 }
 802         }
 803 }
 804
 805 static int handle_event(int fd, int revents, void *cb_data)
 806 {
 807         const struct sr_dev_inst *sdi;
 808         struct sr_datafeed_packet packet;
 809         struct timeval tv;
 810         struct dev_context *devc;
 811         struct drv_context *drvc = di->priv;
 812         const struct libusb_pollfd **lupfd;
 813         int num_probes, i;
 814         uint32_t trigger_offset;
 815         uint8_t capturestate;
 816
 817         (void)fd;
 818         (void)revents;
 819
 820         sdi = cb_data;
 821         devc = sdi->priv;
 822         if (devc->dev_state == STOPPING) {
 823                 /* We've been told to wind up the acquisition. */
 824                 sr_dbg("Stopping acquisition.");
 825                 /*
 826                  * TODO: Doesn't really cancel pending transfers so they might
 827                  * come in after SR_DF_END is sent.
 828                  */
 829                 lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 830                 for (i = 0; lupfd[i]; i++)
 831                         sr_source_remove(lupfd[i]->fd);
 832                 free(lupfd);
 833
 834                 packet.type = SR_DF_END;
 835                 sr_session_send(sdi, &packet);
 836
 837                 devc->dev_state = IDLE;
 838
 839                 return TRUE;
 840         }
 841
 842         /* Always handle pending libusb events. */
 843         tv.tv_sec = tv.tv_usec = 0;
 844         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 845
 846         /* TODO: ugh */
 847         if (devc->dev_state == NEW_CAPTURE) {
 848                 if (dso_capture_start(sdi) != SR_OK)
 849                         return TRUE;
 850                 if (dso_enable_trigger(sdi) != SR_OK)
 851                         return TRUE;
 852 //              if (dso_force_trigger(sdi) != SR_OK)
 853 //                      return TRUE;
 854                 sr_dbg("Successfully requested next chunk.");
 855                 devc->dev_state = CAPTURE;
 856                 return TRUE;
 857         }
 858         if (devc->dev_state != CAPTURE)
 859                 return TRUE;
 860
 861         if ((dso_get_capturestate(sdi, &capturestate, &trigger_offset)) != SR_OK)
 862                 return TRUE;
 863
 864         sr_dbg("Capturestate %d.", capturestate);
 865         sr_dbg("Trigger offset 0x%.6x.", trigger_offset);
 866         switch (capturestate) {
 867         case CAPTURE_EMPTY:
 868                 if (++devc->capture_empty_count >= MAX_CAPTURE_EMPTY) {
 869                         devc->capture_empty_count = 0;
 870                         if (dso_capture_start(sdi) != SR_OK)
 871                                 break;
 872                         if (dso_enable_trigger(sdi) != SR_OK)
 873                                 break;
 874 //                      if (dso_force_trigger(sdi) != SR_OK)
 875 //                              break;
 876                         sr_dbg("Successfully requested next chunk.");
 877                 }
 878                 break;
 879         case CAPTURE_FILLING:
 880                 /* No data yet. */
 881                 break;
 882         case CAPTURE_READY_8BIT:
 883                 /* Remember where in the captured frame the trigger is. */
 884                 devc->trigger_offset = trigger_offset;
 885
 886                 num_probes = (devc->ch1_enabled && devc->ch2_enabled) ? 2 : 1;
 887                 /* TODO: Check malloc return value. */
 888                 devc->framebuf = g_try_malloc(devc->framesize * num_probes * 2);
 889                 devc->samp_buffered = devc->samp_received = 0;
 890
 891                 /* Tell the scope to send us the first frame. */
 892                 if (dso_get_channeldata(sdi, receive_transfer) != SR_OK)
 893                         break;
 894
 895                 /*
 896                  * Don't hit the state machine again until we're done fetching
 897                  * the data we just told the scope to send.
 898                  */
 899                 devc->dev_state = FETCH_DATA;
 900
 901                 /* Tell the frontend a new frame is on the way. */
 902                 packet.type = SR_DF_FRAME_BEGIN;
 903                 sr_session_send(sdi, &packet);
 904                 break;
 905         case CAPTURE_READY_9BIT:
 906                 /* TODO */
 907                 sr_err("Not yet supported.");
 908                 break;
 909         case CAPTURE_TIMEOUT:
 910                 /* Doesn't matter, we'll try again next time. */
 911                 break;
 912         default:
 913                 sr_dbg("Unknown capture state: %d.", capturestate);
 914                 break;
 915         }
 916
 917         return TRUE;
 918 }
 919
 920 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 921                                     void *cb_data)
 922 {
 923         const struct libusb_pollfd **lupfd;
 924         struct dev_context *devc;
 925         struct drv_context *drvc = di->priv;
 926         int i;
 927
 928         if (sdi->status != SR_ST_ACTIVE)
 929                 return SR_ERR;
 930
 931         devc = sdi->priv;
 932         devc->cb_data = cb_data;
 933
 934         if (configure_probes(sdi) != SR_OK) {
 935                 sr_err("Failed to configure probes.");
 936                 return SR_ERR;
 937         }
 938
 939         if (dso_init(sdi) != SR_OK)
 940                 return SR_ERR;
 941
 942         if (dso_capture_start(sdi) != SR_OK)
 943                 return SR_ERR;
 944
 945         devc->dev_state = CAPTURE;
 946         lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 947         for (i = 0; lupfd[i]; i++)
 948                 sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 949                               handle_event, (void *)sdi);
 950         free(lupfd);
 951
 952         /* Send header packet to the session bus. */
 953         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
 954
 955         return SR_OK;
 956 }
 957
 958 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 959 {
 960         struct dev_context *devc;
 961
 962         (void)cb_data;
 963
 964         if (sdi->status != SR_ST_ACTIVE)
 965                 return SR_ERR;
 966
 967         devc = sdi->priv;
 968         devc->dev_state = STOPPING;
 969
 970         return SR_OK;
 971 }
 972
 973 SR_PRIV struct sr_dev_driver hantek_dso_driver_info = {
 974         .name = "hantek-dso",
 975         .longname = "Hantek DSO",
 976         .api_version = 1,
 977         .init = hw_init,
 978         .cleanup = hw_cleanup,
 979         .scan = hw_scan,
 980         .dev_list = hw_dev_list,
 981         .dev_clear = clear_instances,
 982         .config_get = config_get,
 983         .config_set = config_set,
 984         .config_list = config_list,
 985         .dev_open = hw_dev_open,
 986         .dev_close = hw_dev_close,
 987         .dev_acquisition_start = hw_dev_acquisition_start,
 988         .dev_acquisition_stop = hw_dev_acquisition_stop,
 989         .priv = NULL,
 990 };