src/hardware/hantek-6xxx/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2015 Christer Ekholm <christerekholm@gmail.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 <config.h>
  21 #include <math.h>
  22 #include "protocol.h"
  23
  24 /* Max time in ms before we want to check on USB events */
  25 #define TICK 200
  26
  27 #define RANGE(ch) (((float)vdivs[devc->voltage[ch]][0] / vdivs[devc->voltage[ch]][1]) * VDIV_MULTIPLIER)
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t drvopts[] = {
  34         SR_CONF_OSCILLOSCOPE,
  35 };
  36
  37 static const uint32_t devopts[] = {
  38         SR_CONF_CONN | SR_CONF_GET,
  39         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  40         SR_CONF_NUM_VDIV | SR_CONF_GET,
  41         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  42         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  43 };
  44
  45 static const uint32_t devopts_cg[] = {
  46         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48 };
  49
  50 static const char *channel_names[] = {
  51         "CH1", "CH2",
  52 };
  53
  54 static const char *dc_coupling[] = {
  55         "DC", "DC",
  56 };
  57
  58 static const char *acdc_coupling[] = {
  59         "AC", "DC",
  60 };
  61
  62 static const struct hantek_6xxx_profile dev_profiles[] = {
  63         {
  64                 0x04b4, 0x6022, 0x04b5, 0x6022,
  65                 "Hantek", "6022BE", "hantek-6022be.fw",
  66                 dc_coupling, ARRAY_SIZE(dc_coupling), FALSE,
  67         },
  68         {
  69                 0x8102, 0x8102, 0x1D50, 0x608E,
  70                 "Sainsmart", "DDS120", "sainsmart-dds120.fw",
  71                 acdc_coupling, ARRAY_SIZE(acdc_coupling), TRUE,
  72         },
  73         ALL_ZERO
  74 };
  75
  76 static const uint64_t samplerates[] = {
  77         SAMPLERATE_VALUES
  78 };
  79
  80 static const uint64_t vdivs[][2] = {
  81         VDIV_VALUES
  82 };
  83
  84 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  85
  86 static int dev_acquisition_stop(struct sr_dev_inst *sdi);
  87
  88 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  89 {
  90         struct sr_dev_inst *sdi;
  91         struct sr_channel *ch;
  92         struct sr_channel_group *cg;
  93         struct dev_context *devc;
  94         unsigned int i;
  95
  96         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  97         sdi->status = SR_ST_INITIALIZING;
  98         sdi->vendor = g_strdup(prof->vendor);
  99         sdi->model = g_strdup(prof->model);
 100
 101         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 102                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 103                 cg = g_malloc0(sizeof(struct sr_channel_group));
 104                 cg->name = g_strdup(channel_names[i]);
 105                 cg->channels = g_slist_append(cg->channels, ch);
 106                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 107         }
 108
 109         devc = g_malloc0(sizeof(struct dev_context));
 110
 111         for (i = 0; i < NUM_CHANNELS; i++) {
 112                 devc->ch_enabled[i] = TRUE;
 113                 devc->voltage[i] = DEFAULT_VOLTAGE;
 114                 devc->coupling[i] = DEFAULT_COUPLING;
 115         }
 116         devc->coupling_vals = prof->coupling_vals;
 117         devc->coupling_tab_size = prof->coupling_tab_size;
 118
 119         devc->sample_buf = NULL;
 120         devc->sample_buf_write = 0;
 121         devc->sample_buf_size = 0;
 122
 123         devc->profile = prof;
 124         devc->dev_state = IDLE;
 125         devc->samplerate = DEFAULT_SAMPLERATE;
 126
 127         sdi->priv = devc;
 128
 129         return sdi;
 130 }
 131
 132 static int configure_channels(const struct sr_dev_inst *sdi)
 133 {
 134         struct dev_context *devc;
 135         const GSList *l;
 136         int p;
 137         struct sr_channel *ch;
 138         devc = sdi->priv;
 139
 140         g_slist_free(devc->enabled_channels);
 141         devc->enabled_channels = NULL;
 142         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 143
 144         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 145                 ch = l->data;
 146                 if (p < NUM_CHANNELS) {
 147                         devc->ch_enabled[p] = ch->enabled;
 148                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 149                 }
 150         }
 151
 152         return SR_OK;
 153 }
 154
 155 static void clear_dev_context(void *priv)
 156 {
 157         struct dev_context *devc;
 158
 159         devc = priv;
 160         g_slist_free(devc->enabled_channels);
 161         g_free(devc);
 162 }
 163
 164 static int dev_clear(const struct sr_dev_driver *di)
 165 {
 166         return std_dev_clear(di, clear_dev_context);
 167 }
 168
 169 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 170 {
 171         struct drv_context *drvc;
 172         struct dev_context *devc;
 173         struct sr_dev_inst *sdi;
 174         struct sr_usb_dev_inst *usb;
 175         struct sr_config *src;
 176         const struct hantek_6xxx_profile *prof;
 177         GSList *l, *devices, *conn_devices;
 178         struct libusb_device_descriptor des;
 179         libusb_device **devlist;
 180         int i, j;
 181         const char *conn;
 182         char connection_id[64];
 183
 184         drvc = di->context;
 185
 186         devices = 0;
 187
 188         conn = NULL;
 189         for (l = options; l; l = l->next) {
 190                 src = l->data;
 191                 if (src->key == SR_CONF_CONN) {
 192                         conn = g_variant_get_string(src->data, NULL);
 193                         break;
 194                 }
 195         }
 196         if (conn)
 197                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 198         else
 199                 conn_devices = NULL;
 200
 201         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 202         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 203         for (i = 0; devlist[i]; i++) {
 204                 if (conn) {
 205                         usb = NULL;
 206                         for (l = conn_devices; l; l = l->next) {
 207                                 usb = l->data;
 208                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 209                                         && usb->address == libusb_get_device_address(devlist[i]))
 210                                         break;
 211                         }
 212                         if (!l)
 213                                 /* This device matched none of the ones that
 214                                  * matched the conn specification. */
 215                                 continue;
 216                 }
 217
 218                 libusb_get_device_descriptor(devlist[i], &des);
 219
 220                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 221
 222                 prof = NULL;
 223                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 224                         if (des.idVendor == dev_profiles[j].orig_vid
 225                                 && des.idProduct == dev_profiles[j].orig_pid) {
 226                                 /* Device matches the pre-firmware profile. */
 227                                 prof = &dev_profiles[j];
 228                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 229                                 sdi = hantek_6xxx_dev_new(prof);
 230                                 sdi->connection_id = g_strdup(connection_id);
 231                                 devices = g_slist_append(devices, sdi);
 232                                 devc = sdi->priv;
 233                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 234                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 235                                         /* Remember when the firmware on this device was updated. */
 236                                         devc->fw_updated = g_get_monotonic_time();
 237                                 else
 238                                         sr_err("Firmware upload failed.");
 239                                 /* Dummy USB address of 0xff will get overwritten later. */
 240                                 sdi->conn = sr_usb_dev_inst_new(
 241                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 242                                 break;
 243                         } else if (des.idVendor == dev_profiles[j].fw_vid
 244                                 && des.idProduct == dev_profiles[j].fw_pid) {
 245                                 /* Device matches the post-firmware profile. */
 246                                 prof = &dev_profiles[j];
 247                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 248                                 sdi = hantek_6xxx_dev_new(prof);
 249                                 sdi->connection_id = g_strdup(connection_id);
 250                                 sdi->status = SR_ST_INACTIVE;
 251                                 devices = g_slist_append(devices, sdi);
 252                                 sdi->inst_type = SR_INST_USB;
 253                                 sdi->conn = sr_usb_dev_inst_new(
 254                                                 libusb_get_bus_number(devlist[i]),
 255                                                 libusb_get_device_address(devlist[i]), NULL);
 256                                 break;
 257                         }
 258                 }
 259                 if (!prof)
 260                         /* Not a supported VID/PID. */
 261                         continue;
 262         }
 263         libusb_free_device_list(devlist, 1);
 264
 265         return std_scan_complete(di, devices);
 266 }
 267
 268 static int dev_open(struct sr_dev_inst *sdi)
 269 {
 270         struct dev_context *devc;
 271         struct sr_usb_dev_inst *usb;
 272         int64_t timediff_us, timediff_ms;
 273         int err;
 274
 275         devc = sdi->priv;
 276         usb = sdi->conn;
 277
 278         /*
 279          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 280          * for the FX2 to renumerate.
 281          */
 282         err = SR_ERR;
 283         if (devc->fw_updated > 0) {
 284                 sr_info("Waiting for device to reset.");
 285                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 286                 g_usleep(300 * 1000);
 287                 timediff_ms = 0;
 288                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 289                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 290                                 break;
 291                         g_usleep(100 * 1000);
 292                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 293                         timediff_ms = timediff_us / 1000;
 294                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 295                 }
 296                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 297                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 298         } else {
 299                 err = hantek_6xxx_open(sdi);
 300         }
 301
 302         if (err != SR_OK) {
 303                 sr_err("Unable to open device.");
 304                 return SR_ERR;
 305         }
 306
 307         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 308         if (err != 0) {
 309                 sr_err("Unable to claim interface: %s.",
 310                            libusb_error_name(err));
 311                 return SR_ERR;
 312         }
 313
 314         return SR_OK;
 315 }
 316
 317 static int dev_close(struct sr_dev_inst *sdi)
 318 {
 319         hantek_6xxx_close(sdi);
 320
 321         return SR_OK;
 322 }
 323
 324 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 325                 const struct sr_channel_group *cg)
 326 {
 327         struct dev_context *devc;
 328         struct sr_usb_dev_inst *usb;
 329         char str[128];
 330         const uint64_t *vdiv;
 331         int ch_idx;
 332
 333         switch (key) {
 334         case SR_CONF_NUM_VDIV:
 335                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 336                 break;
 337         }
 338
 339         if (!sdi)
 340                 return SR_ERR_ARG;
 341
 342         devc = sdi->priv;
 343         if (!cg) {
 344                 switch (key) {
 345                 case SR_CONF_SAMPLERATE:
 346                         *data = g_variant_new_uint64(devc->samplerate);
 347                         break;
 348                 case SR_CONF_LIMIT_MSEC:
 349                         *data = g_variant_new_uint64(devc->limit_msec);
 350                         break;
 351                 case SR_CONF_LIMIT_SAMPLES:
 352                         *data = g_variant_new_uint64(devc->limit_samples);
 353                         break;
 354                 case SR_CONF_CONN:
 355                         if (!sdi->conn)
 356                                 return SR_ERR_ARG;
 357                         usb = sdi->conn;
 358                         if (usb->address == 255)
 359                                 /* Device still needs to re-enumerate after firmware
 360                                  * upload, so we don't know its (future) address. */
 361                                 return SR_ERR;
 362                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 363                         *data = g_variant_new_string(str);
 364                         break;
 365                 default:
 366                         return SR_ERR_NA;
 367                 }
 368         } else {
 369                 if (sdi->channel_groups->data == cg)
 370                         ch_idx = 0;
 371                 else if (sdi->channel_groups->next->data == cg)
 372                         ch_idx = 1;
 373                 else
 374                         return SR_ERR_ARG;
 375                 switch (key) {
 376                 case SR_CONF_VDIV:
 377                         vdiv = vdivs[devc->voltage[ch_idx]];
 378                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 379                         break;
 380                 case SR_CONF_COUPLING:
 381                         *data = g_variant_new_string(devc->coupling_vals[devc->coupling[ch_idx]]);
 382                         break;
 383                 }
 384         }
 385
 386         return SR_OK;
 387 }
 388
 389 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 390                 const struct sr_channel_group *cg)
 391 {
 392         struct dev_context *devc;
 393         uint64_t p, q;
 394         int tmp_int, ch_idx, ret;
 395         unsigned int i;
 396         const char *tmp_str;
 397
 398         if (sdi->status != SR_ST_ACTIVE)
 399                 return SR_ERR_DEV_CLOSED;
 400
 401         ret = SR_OK;
 402         devc = sdi->priv;
 403         if (!cg) {
 404                 switch (key) {
 405                 case SR_CONF_SAMPLERATE:
 406                         devc->samplerate = g_variant_get_uint64(data);
 407                         hantek_6xxx_update_samplerate(sdi);
 408                         break;
 409                 case SR_CONF_LIMIT_MSEC:
 410                         devc->limit_msec = g_variant_get_uint64(data);
 411                         break;
 412                 case SR_CONF_LIMIT_SAMPLES:
 413                         devc->limit_samples = g_variant_get_uint64(data);
 414                         break;
 415                 default:
 416                         ret = SR_ERR_NA;
 417                         break;
 418                 }
 419         } else {
 420                 if (sdi->channel_groups->data == cg)
 421                         ch_idx = 0;
 422                 else if (sdi->channel_groups->next->data == cg)
 423                         ch_idx = 1;
 424                 else
 425                         return SR_ERR_ARG;
 426                 switch (key) {
 427                 case SR_CONF_VDIV:
 428                         g_variant_get(data, "(tt)", &p, &q);
 429                         tmp_int = -1;
 430                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 431                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 432                                         tmp_int = i;
 433                                         break;
 434                                 }
 435                         }
 436                         if (tmp_int >= 0) {
 437                                 devc->voltage[ch_idx] = tmp_int;
 438                                 hantek_6xxx_update_vdiv(sdi);
 439                         } else
 440                                 ret = SR_ERR_ARG;
 441                         break;
 442                 case SR_CONF_COUPLING:
 443                         tmp_str = g_variant_get_string(data, NULL);
 444                         for (i = 0; i < devc->coupling_tab_size; i++) {
 445                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 446                                         devc->coupling[ch_idx] = i;
 447                                         break;
 448                                 }
 449                         }
 450                         if (i == devc->coupling_tab_size)
 451                                 ret = SR_ERR_ARG;
 452                         break;
 453                 default:
 454                         ret = SR_ERR_NA;
 455                         break;
 456                 }
 457         }
 458
 459         return ret;
 460 }
 461
 462 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 463                 const struct sr_channel_group *cg)
 464 {
 465         GVariant *tuple, *rational[2];
 466         GVariantBuilder gvb;
 467         unsigned int i;
 468         GVariant *gvar;
 469         struct dev_context *devc = NULL;
 470
 471         if (key == SR_CONF_SCAN_OPTIONS) {
 472                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 473                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 474                 return SR_OK;
 475         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 476                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 477                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 478                 return SR_OK;
 479         }
 480
 481         if (sdi)
 482                 devc = sdi->priv;
 483
 484         if (!cg) {
 485                 switch (key) {
 486                 case SR_CONF_DEVICE_OPTIONS:
 487                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 488                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 489                         break;
 490                 case SR_CONF_SAMPLERATE:
 491                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 492                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 493                                 samplerates, ARRAY_SIZE(samplerates),
 494                                 sizeof(uint64_t));
 495                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 496                         *data = g_variant_builder_end(&gvb);
 497                         break;
 498                 default:
 499                         return SR_ERR_NA;
 500                 }
 501         } else {
 502                 switch (key) {
 503                 case SR_CONF_DEVICE_OPTIONS:
 504                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 505                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 506                         break;
 507                 case SR_CONF_COUPLING:
 508                         if (!devc)
 509                                 return SR_ERR_NA;
 510                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 511                         break;
 512                 case SR_CONF_VDIV:
 513                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 514                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 515                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 516                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 517                                 tuple = g_variant_new_tuple(rational, 2);
 518                                 g_variant_builder_add_value(&gvb, tuple);
 519                         }
 520                         *data = g_variant_builder_end(&gvb);
 521                         break;
 522                 default:
 523                         return SR_ERR_NA;
 524                 }
 525         }
 526
 527         return SR_OK;
 528 }
 529
 530 /* Minimise data amount for limit_samples and limit_msec limits. */
 531 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 532 {
 533         struct dev_context *devc = sdi->priv;
 534         uint32_t data_left, data_left_2, i;
 535         int32_t time_left;
 536
 537         if (devc->limit_msec) {
 538                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 539                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 540         } else if (devc->limit_samples) {
 541                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 542         } else {
 543                 data_left = devc->samplerate * NUM_CHANNELS;
 544         }
 545
 546         /* Round up to nearest power of two. */
 547         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 548                 ;
 549         data_left_2 = i;
 550
 551         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 552
 553         return data_left_2;
 554 }
 555
 556 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 557                 int num_samples)
 558 {
 559         struct sr_datafeed_packet packet;
 560         struct sr_datafeed_analog analog;
 561         struct sr_analog_encoding encoding;
 562         struct sr_analog_meaning meaning;
 563         struct sr_analog_spec spec;
 564         struct dev_context *devc = sdi->priv;
 565         GSList *channels = devc->enabled_channels;
 566
 567         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 568         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 569
 570         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 571
 572         packet.type = SR_DF_ANALOG;
 573         packet.payload = &analog;
 574
 575         analog.num_samples = num_samples;
 576         analog.meaning->mq = SR_MQ_VOLTAGE;
 577         analog.meaning->unit = SR_UNIT_VOLT;
 578         analog.meaning->mqflags = 0;
 579
 580         analog.data = g_try_malloc(num_samples * sizeof(float));
 581         if (!analog.data) {
 582                 sr_err("Analog data buffer malloc failed.");
 583                 devc->dev_state = STOPPING;
 584                 return;
 585         }
 586
 587         for (int ch = 0; ch < 2; ch++) {
 588                 if (!devc->ch_enabled[ch])
 589                         continue;
 590
 591                 float vdivlog = log10f(ch_bit[ch]);
 592                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 593                 analog.encoding->digits = digits;
 594                 analog.spec->spec_digits = digits;
 595                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 596
 597                 for (int i = 0; i < num_samples; i++) {
 598                         /*
 599                          * The device always sends data for both channels. If a channel
 600                          * is disabled, it contains a copy of the enabled channel's
 601                          * data. However, we only send the requested channels to
 602                          * the bus.
 603                          *
 604                          * Voltage values are encoded as a value 0-255, where the
 605                          * value is a point in the range represented by the vdiv
 606                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 607                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 608                          */
 609                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 610                 }
 611
 612                 sr_session_send(sdi, &packet);
 613                 g_slist_free(analog.meaning->channels);
 614
 615                 channels = channels->next;
 616         }
 617         g_free(analog.data);
 618 }
 619
 620 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 621 {
 622         int i = 0;
 623         uint64_t send = 0;
 624         uint32_t chunk;
 625
 626         while (send < samples) {
 627                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 628                 send += chunk;
 629                 send_chunk(sdi, buf[i]->buffer, chunk);
 630
 631                 /*
 632                  * Everything in this transfer was either copied to the buffer
 633                  * or sent to the session bus.
 634                  */
 635                 g_free(buf[i]->buffer);
 636                 libusb_free_transfer(buf[i]);
 637                 i++;
 638         }
 639 }
 640
 641 /*
 642  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 643  * Only channel data comes in asynchronously, and all transfers for this are
 644  * queued up beforehand, so this just needs to chuck the incoming data onto
 645  * the libsigrok session bus.
 646  */
 647 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 648 {
 649         struct sr_dev_inst *sdi;
 650         struct dev_context *devc;
 651
 652         sdi = transfer->user_data;
 653         devc = sdi->priv;
 654
 655         if (devc->dev_state == FLUSH) {
 656                 g_free(transfer->buffer);
 657                 libusb_free_transfer(transfer);
 658                 devc->dev_state = CAPTURE;
 659                 devc->aq_started = g_get_monotonic_time();
 660                 read_channel(sdi, data_amount(sdi));
 661                 return;
 662         }
 663
 664         if (devc->dev_state != CAPTURE)
 665                 return;
 666
 667         if (!devc->sample_buf) {
 668                 devc->sample_buf_size = 10;
 669                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 670                 devc->sample_buf_write = 0;
 671         }
 672
 673         if (devc->sample_buf_write >= devc->sample_buf_size) {
 674                 devc->sample_buf_size += 10;
 675                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 676                                 devc->sample_buf_size * sizeof(transfer));
 677                 if (!devc->sample_buf) {
 678                         sr_err("Sample buffer malloc failed.");
 679                         devc->dev_state = STOPPING;
 680                         return;
 681                 }
 682         }
 683
 684         devc->sample_buf[devc->sample_buf_write++] = transfer;
 685         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 686
 687         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 688                 (uint64_t)(transfer->actual_length * 1000 /
 689                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 690                 NUM_CHANNELS));
 691
 692         sr_spew("receive_transfer(): status %s received %d bytes.",
 693                 libusb_error_name(transfer->status), transfer->actual_length);
 694
 695         if (transfer->actual_length == 0)
 696                 /* Nothing to send to the bus. */
 697                 return;
 698
 699         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 700                 sr_info("Requested number of samples reached, stopping. %"
 701                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 702                         devc->samp_received);
 703                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 704                 sdi->driver->dev_acquisition_stop(sdi);
 705         } else if (devc->limit_msec && (g_get_monotonic_time() -
 706                         devc->aq_started) / 1000 >= devc->limit_msec) {
 707                 sr_info("Requested time limit reached, stopping. %d <= %d",
 708                         (uint32_t)devc->limit_msec,
 709                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 710                 send_data(sdi, devc->sample_buf, devc->samp_received);
 711                 g_free(devc->sample_buf);
 712                 devc->sample_buf = NULL;
 713                 sdi->driver->dev_acquisition_stop(sdi);
 714         } else {
 715                 read_channel(sdi, data_amount(sdi));
 716         }
 717 }
 718
 719 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 720 {
 721         int ret;
 722         struct dev_context *devc;
 723
 724         devc = sdi->priv;
 725
 726         amount = MIN(amount, MAX_PACKET_SIZE);
 727         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 728         devc->read_start_ts = g_get_monotonic_time();
 729         devc->read_data_amount = amount;
 730
 731         return ret;
 732 }
 733
 734 static int handle_event(int fd, int revents, void *cb_data)
 735 {
 736         const struct sr_dev_inst *sdi;
 737         struct timeval tv;
 738         struct sr_dev_driver *di;
 739         struct dev_context *devc;
 740         struct drv_context *drvc;
 741
 742         (void)fd;
 743         (void)revents;
 744
 745         sdi = cb_data;
 746         di = sdi->driver;
 747         drvc = di->context;
 748         devc = sdi->priv;
 749
 750         /* Always handle pending libusb events. */
 751         tv.tv_sec = tv.tv_usec = 0;
 752         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 753
 754         if (devc->dev_state == STOPPING) {
 755                 /* We've been told to wind up the acquisition. */
 756                 sr_dbg("Stopping acquisition.");
 757
 758                 hantek_6xxx_stop_data_collecting(sdi);
 759                 /*
 760                  * TODO: Doesn't really cancel pending transfers so they might
 761                  * come in after SR_DF_END is sent.
 762                  */
 763                 usb_source_remove(sdi->session, drvc->sr_ctx);
 764
 765                 std_session_send_df_end(sdi);
 766
 767                 devc->dev_state = IDLE;
 768
 769                 return TRUE;
 770         }
 771
 772         return TRUE;
 773 }
 774
 775 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 776 {
 777         struct dev_context *devc;
 778         struct sr_dev_driver *di = sdi->driver;
 779         struct drv_context *drvc = di->context;
 780
 781         if (sdi->status != SR_ST_ACTIVE)
 782                 return SR_ERR_DEV_CLOSED;
 783
 784         devc = sdi->priv;
 785
 786         if (configure_channels(sdi) != SR_OK) {
 787                 sr_err("Failed to configure channels.");
 788                 return SR_ERR;
 789         }
 790
 791         if (hantek_6xxx_init(sdi) != SR_OK)
 792                 return SR_ERR;
 793
 794         std_session_send_df_header(sdi);
 795
 796         devc->samp_received = 0;
 797         devc->dev_state = FLUSH;
 798
 799         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 800                        handle_event, (void *)sdi);
 801
 802         hantek_6xxx_start_data_collecting(sdi);
 803
 804         read_channel(sdi, FLUSH_PACKET_SIZE);
 805
 806         return SR_OK;
 807 }
 808
 809 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 810 {
 811         struct dev_context *devc;
 812
 813         if (sdi->status != SR_ST_ACTIVE)
 814                 return SR_ERR;
 815
 816         devc = sdi->priv;
 817         devc->dev_state = STOPPING;
 818
 819         g_free(devc->sample_buf); devc->sample_buf = NULL;
 820
 821         return SR_OK;
 822 }
 823
 824 static struct sr_dev_driver hantek_6xxx_driver_info = {
 825         .name = "hantek-6xxx",
 826         .longname = "Hantek 6xxx",
 827         .api_version = 1,
 828         .init = std_init,
 829         .cleanup = std_cleanup,
 830         .scan = scan,
 831         .dev_list = std_dev_list,
 832         .dev_clear = dev_clear,
 833         .config_get = config_get,
 834         .config_set = config_set,
 835         .config_list = config_list,
 836         .dev_open = dev_open,
 837         .dev_close = dev_close,
 838         .dev_acquisition_start = dev_acquisition_start,
 839         .dev_acquisition_stop = dev_acquisition_stop,
 840         .context = NULL,
 841 };
 842 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);