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_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  40         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  41         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  42         SR_CONF_NUM_VDIV | SR_CONF_GET,
  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",
  56 };
  57
  58 static const char *acdc_coupling[] = {
  59         "AC", "DC",
  60 };
  61
  62 static const struct hantek_6xxx_profile dev_profiles[] = {
  63         {
  64                 /* Windows: "Hantek6022BE DRIVER 1": 04b4:6022 */
  65                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  66                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  67                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  68         },
  69         {
  70                 /* Windows: "Hantek6022BE DRIVER 2": 04b5:6022 */
  71                 0x04b5, 0x6022, 0x1d50, 0x608e, 0x0001,
  72                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  73                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  74         },
  75         {
  76                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  77                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  78                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  79         },
  80         {
  81                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  82                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  83                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  84         },
  85         ALL_ZERO
  86 };
  87
  88 static const uint64_t samplerates[] = {
  89         SAMPLERATE_VALUES
  90 };
  91
  92 static const uint64_t vdivs[][2] = {
  93         VDIV_VALUES
  94 };
  95
  96 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  97
  98 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  99 {
 100         struct sr_dev_inst *sdi;
 101         struct sr_channel *ch;
 102         struct sr_channel_group *cg;
 103         struct dev_context *devc;
 104         unsigned int i;
 105
 106         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 107         sdi->status = SR_ST_INITIALIZING;
 108         sdi->vendor = g_strdup(prof->vendor);
 109         sdi->model = g_strdup(prof->model);
 110
 111         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 112                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 113                 cg = g_malloc0(sizeof(struct sr_channel_group));
 114                 cg->name = g_strdup(channel_names[i]);
 115                 cg->channels = g_slist_append(cg->channels, ch);
 116                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 117         }
 118
 119         devc = g_malloc0(sizeof(struct dev_context));
 120
 121         for (i = 0; i < NUM_CHANNELS; i++) {
 122                 devc->ch_enabled[i] = TRUE;
 123                 devc->voltage[i] = DEFAULT_VOLTAGE;
 124                 devc->coupling[i] = DEFAULT_COUPLING;
 125         }
 126         devc->coupling_vals = prof->coupling_vals;
 127         devc->coupling_tab_size = prof->coupling_tab_size;
 128         devc->has_coupling = prof->has_coupling;
 129
 130         devc->profile = prof;
 131         devc->dev_state = IDLE;
 132         devc->samplerate = DEFAULT_SAMPLERATE;
 133
 134         sdi->priv = devc;
 135
 136         return sdi;
 137 }
 138
 139 static int configure_channels(const struct sr_dev_inst *sdi)
 140 {
 141         struct dev_context *devc;
 142         const GSList *l;
 143         int p;
 144         struct sr_channel *ch;
 145         devc = sdi->priv;
 146
 147         g_slist_free(devc->enabled_channels);
 148         devc->enabled_channels = NULL;
 149         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 150
 151         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 152                 ch = l->data;
 153                 if (p < NUM_CHANNELS) {
 154                         devc->ch_enabled[p] = ch->enabled;
 155                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 156                 }
 157         }
 158
 159         return SR_OK;
 160 }
 161
 162 static void clear_helper(struct dev_context *devc)
 163 {
 164         g_slist_free(devc->enabled_channels);
 165 }
 166
 167 static int dev_clear(const struct sr_dev_driver *di)
 168 {
 169         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 170 }
 171
 172 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 173 {
 174         struct drv_context *drvc;
 175         struct dev_context *devc;
 176         struct sr_dev_inst *sdi;
 177         struct sr_usb_dev_inst *usb;
 178         struct sr_config *src;
 179         const struct hantek_6xxx_profile *prof;
 180         GSList *l, *devices, *conn_devices;
 181         struct libusb_device_descriptor des;
 182         libusb_device **devlist;
 183         int i, j;
 184         const char *conn;
 185         char connection_id[64];
 186
 187         drvc = di->context;
 188
 189         devices = 0;
 190
 191         conn = NULL;
 192         for (l = options; l; l = l->next) {
 193                 src = l->data;
 194                 if (src->key == SR_CONF_CONN) {
 195                         conn = g_variant_get_string(src->data, NULL);
 196                         break;
 197                 }
 198         }
 199         if (conn)
 200                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 201         else
 202                 conn_devices = NULL;
 203
 204         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 205         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 206         for (i = 0; devlist[i]; i++) {
 207                 if (conn) {
 208                         usb = NULL;
 209                         for (l = conn_devices; l; l = l->next) {
 210                                 usb = l->data;
 211                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 212                                         && usb->address == libusb_get_device_address(devlist[i]))
 213                                         break;
 214                         }
 215                         if (!l)
 216                                 /* This device matched none of the ones that
 217                                  * matched the conn specification. */
 218                                 continue;
 219                 }
 220
 221                 libusb_get_device_descriptor(devlist[i], &des);
 222
 223                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 224                         continue;
 225
 226                 prof = NULL;
 227                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 228                         if (des.idVendor == dev_profiles[j].orig_vid
 229                                 && des.idProduct == dev_profiles[j].orig_pid) {
 230                                 /* Device matches the pre-firmware profile. */
 231                                 prof = &dev_profiles[j];
 232                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 233                                 sdi = hantek_6xxx_dev_new(prof);
 234                                 sdi->connection_id = g_strdup(connection_id);
 235                                 devices = g_slist_append(devices, sdi);
 236                                 devc = sdi->priv;
 237                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 238                                                 USB_CONFIGURATION, prof->firmware) == SR_OK) {
 239                                         /* Remember when the firmware on this device was updated. */
 240                                         devc->fw_updated = g_get_monotonic_time();
 241                                 } else {
 242                                         sr_err("Firmware upload failed, name %s.", prof->firmware);
 243                                 }
 244                                 /* Dummy USB address of 0xff will get overwritten later. */
 245                                 sdi->conn = sr_usb_dev_inst_new(
 246                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 247                                 break;
 248                         } else if (des.idVendor == dev_profiles[j].fw_vid
 249                                 && des.idProduct == dev_profiles[j].fw_pid
 250                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 251                                 /* Device matches the post-firmware profile. */
 252                                 prof = &dev_profiles[j];
 253                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 254                                 sdi = hantek_6xxx_dev_new(prof);
 255                                 sdi->connection_id = g_strdup(connection_id);
 256                                 sdi->status = SR_ST_INACTIVE;
 257                                 devices = g_slist_append(devices, sdi);
 258                                 sdi->inst_type = SR_INST_USB;
 259                                 sdi->conn = sr_usb_dev_inst_new(
 260                                                 libusb_get_bus_number(devlist[i]),
 261                                                 libusb_get_device_address(devlist[i]), NULL);
 262                                 break;
 263                         }
 264                 }
 265                 if (!prof)
 266                         /* Not a supported VID/PID. */
 267                         continue;
 268         }
 269         libusb_free_device_list(devlist, 1);
 270
 271         return std_scan_complete(di, devices);
 272 }
 273
 274 static int dev_open(struct sr_dev_inst *sdi)
 275 {
 276         struct dev_context *devc;
 277         struct sr_usb_dev_inst *usb;
 278         int64_t timediff_us, timediff_ms;
 279         int err;
 280
 281         devc = sdi->priv;
 282         usb = sdi->conn;
 283
 284         /*
 285          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 286          * for the FX2 to renumerate.
 287          */
 288         err = SR_ERR;
 289         if (devc->fw_updated > 0) {
 290                 sr_info("Waiting for device to reset.");
 291                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 292                 g_usleep(300 * 1000);
 293                 timediff_ms = 0;
 294                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 295                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 296                                 break;
 297                         g_usleep(100 * 1000);
 298                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 299                         timediff_ms = timediff_us / 1000;
 300                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 301                 }
 302                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 303                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 304         } else {
 305                 err = hantek_6xxx_open(sdi);
 306         }
 307
 308         if (err != SR_OK) {
 309                 sr_err("Unable to open device.");
 310                 return SR_ERR;
 311         }
 312
 313         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 314         if (err != 0) {
 315                 sr_err("Unable to claim interface: %s.",
 316                         libusb_error_name(err));
 317                 return SR_ERR;
 318         }
 319
 320         return SR_OK;
 321 }
 322
 323 static int dev_close(struct sr_dev_inst *sdi)
 324 {
 325         hantek_6xxx_close(sdi);
 326
 327         return SR_OK;
 328 }
 329
 330 static int config_get(uint32_t key, GVariant **data,
 331         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 332 {
 333         struct dev_context *devc;
 334         struct sr_usb_dev_inst *usb;
 335         const uint64_t *vdiv;
 336         int ch_idx;
 337
 338         switch (key) {
 339         case SR_CONF_NUM_VDIV:
 340                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 341                 break;
 342         }
 343
 344         if (!sdi)
 345                 return SR_ERR_ARG;
 346
 347         devc = sdi->priv;
 348         if (!cg) {
 349                 switch (key) {
 350                 case SR_CONF_SAMPLERATE:
 351                         *data = g_variant_new_uint64(devc->samplerate);
 352                         break;
 353                 case SR_CONF_LIMIT_MSEC:
 354                         *data = g_variant_new_uint64(devc->limit_msec);
 355                         break;
 356                 case SR_CONF_LIMIT_SAMPLES:
 357                         *data = g_variant_new_uint64(devc->limit_samples);
 358                         break;
 359                 case SR_CONF_CONN:
 360                         if (!sdi->conn)
 361                                 return SR_ERR_ARG;
 362                         usb = sdi->conn;
 363                         if (usb->address == 255)
 364                                 /* Device still needs to re-enumerate after firmware
 365                                  * upload, so we don't know its (future) address. */
 366                                 return SR_ERR;
 367                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 368                         break;
 369                 default:
 370                         return SR_ERR_NA;
 371                 }
 372         } else {
 373                 if (sdi->channel_groups->data == cg)
 374                         ch_idx = 0;
 375                 else if (sdi->channel_groups->next->data == cg)
 376                         ch_idx = 1;
 377                 else
 378                         return SR_ERR_ARG;
 379                 switch (key) {
 380                 case SR_CONF_VDIV:
 381                         vdiv = vdivs[devc->voltage[ch_idx]];
 382                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 383                         break;
 384                 case SR_CONF_COUPLING:
 385                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 386                                         == COUPLING_DC) ? "DC" : "AC");
 387                         break;
 388                 }
 389         }
 390
 391         return SR_OK;
 392 }
 393
 394 static int config_set(uint32_t key, GVariant *data,
 395         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 396 {
 397         struct dev_context *devc;
 398         int ch_idx, idx;
 399
 400         devc = sdi->priv;
 401         if (!cg) {
 402                 switch (key) {
 403                 case SR_CONF_SAMPLERATE:
 404                         devc->samplerate = g_variant_get_uint64(data);
 405                         hantek_6xxx_update_samplerate(sdi);
 406                         break;
 407                 case SR_CONF_LIMIT_MSEC:
 408                         devc->limit_msec = g_variant_get_uint64(data);
 409                         break;
 410                 case SR_CONF_LIMIT_SAMPLES:
 411                         devc->limit_samples = g_variant_get_uint64(data);
 412                         break;
 413                 default:
 414                         return SR_ERR_NA;
 415                 }
 416         } else {
 417                 if (sdi->channel_groups->data == cg)
 418                         ch_idx = 0;
 419                 else if (sdi->channel_groups->next->data == cg)
 420                         ch_idx = 1;
 421                 else
 422                         return SR_ERR_ARG;
 423                 switch (key) {
 424                 case SR_CONF_VDIV:
 425                         if ((idx = std_u64_tuple_idx(data, ARRAY_AND_SIZE(vdivs))) < 0)
 426                                 return SR_ERR_ARG;
 427                         devc->voltage[ch_idx] = idx;
 428                         hantek_6xxx_update_vdiv(sdi);
 429                         break;
 430                 case SR_CONF_COUPLING:
 431                         if ((idx = std_str_idx(data, devc->coupling_vals,
 432                                                 devc->coupling_tab_size)) < 0)
 433                                 return SR_ERR_ARG;
 434                         devc->coupling[ch_idx] = idx;
 435                         break;
 436                 default:
 437                         return SR_ERR_NA;
 438                 }
 439         }
 440
 441         return SR_OK;
 442 }
 443
 444 static int config_list(uint32_t key, GVariant **data,
 445         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 446 {
 447         struct dev_context *devc;
 448
 449         devc = (sdi) ? sdi->priv : NULL;
 450
 451         if (!cg) {
 452                 switch (key) {
 453                 case SR_CONF_SCAN_OPTIONS:
 454                 case SR_CONF_DEVICE_OPTIONS:
 455                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 456                 case SR_CONF_SAMPLERATE:
 457                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 458                         break;
 459                 default:
 460                         return SR_ERR_NA;
 461                 }
 462         } else {
 463                 switch (key) {
 464                 case SR_CONF_DEVICE_OPTIONS:
 465                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 466                         break;
 467                 case SR_CONF_COUPLING:
 468                         if (!devc)
 469                                 return SR_ERR_ARG;
 470                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 471                         break;
 472                 case SR_CONF_VDIV:
 473                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(vdivs));
 474                         break;
 475                 default:
 476                         return SR_ERR_NA;
 477                 }
 478         }
 479
 480         return SR_OK;
 481 }
 482
 483 /* Minimise data amount for limit_samples and limit_msec limits. */
 484 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 485 {
 486         struct dev_context *devc = sdi->priv;
 487         uint32_t data_left, data_left_2, i;
 488         int32_t time_left;
 489
 490         if (devc->limit_msec) {
 491                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 492                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 493         } else if (devc->limit_samples) {
 494                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 495         } else {
 496                 data_left = devc->samplerate * NUM_CHANNELS;
 497         }
 498
 499         /* Round up to nearest power of two. */
 500         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 501                 ;
 502         data_left_2 = i;
 503
 504         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 505
 506         return data_left_2;
 507 }
 508
 509 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 510                 int num_samples)
 511 {
 512         struct sr_datafeed_packet packet;
 513         struct sr_datafeed_analog analog;
 514         struct sr_analog_encoding encoding;
 515         struct sr_analog_meaning meaning;
 516         struct sr_analog_spec spec;
 517         struct dev_context *devc = sdi->priv;
 518         GSList *channels = devc->enabled_channels;
 519
 520         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 521         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 522
 523         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 524
 525         packet.type = SR_DF_ANALOG;
 526         packet.payload = &analog;
 527
 528         analog.num_samples = num_samples;
 529         analog.meaning->mq = SR_MQ_VOLTAGE;
 530         analog.meaning->unit = SR_UNIT_VOLT;
 531         analog.meaning->mqflags = 0;
 532
 533         analog.data = g_try_malloc(num_samples * sizeof(float));
 534         if (!analog.data) {
 535                 sr_err("Analog data buffer malloc failed.");
 536                 devc->dev_state = STOPPING;
 537                 return;
 538         }
 539
 540         for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 541                 if (!devc->ch_enabled[ch])
 542                         continue;
 543
 544                 float vdivlog = log10f(ch_bit[ch]);
 545                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 546                 analog.encoding->digits = digits;
 547                 analog.spec->spec_digits = digits;
 548                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 549
 550                 for (int i = 0; i < num_samples; i++) {
 551                         /*
 552                          * The device always sends data for both channels. If a channel
 553                          * is disabled, it contains a copy of the enabled channel's
 554                          * data. However, we only send the requested channels to
 555                          * the bus.
 556                          *
 557                          * Voltage values are encoded as a value 0-255, where the
 558                          * value is a point in the range represented by the vdiv
 559                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 560                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 561                          */
 562                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 563                 }
 564
 565                 sr_session_send(sdi, &packet);
 566                 g_slist_free(analog.meaning->channels);
 567
 568                 channels = channels->next;
 569         }
 570         g_free(analog.data);
 571 }
 572
 573 /*
 574  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 575  * Only channel data comes in asynchronously, and all transfers for this are
 576  * queued up beforehand, so this just needs to chuck the incoming data onto
 577  * the libsigrok session bus.
 578  */
 579 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 580 {
 581         struct sr_dev_inst *sdi;
 582         struct dev_context *devc;
 583
 584         sdi = transfer->user_data;
 585         devc = sdi->priv;
 586
 587         if (devc->dev_state == FLUSH) {
 588                 g_free(transfer->buffer);
 589                 libusb_free_transfer(transfer);
 590                 devc->dev_state = CAPTURE;
 591                 devc->aq_started = g_get_monotonic_time();
 592                 read_channel(sdi, data_amount(sdi));
 593                 return;
 594         }
 595
 596         if (devc->dev_state != CAPTURE)
 597                 return;
 598
 599         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 600                 (uint64_t)(transfer->actual_length * 1000 /
 601                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 602                 NUM_CHANNELS));
 603
 604         sr_spew("receive_transfer(): status %s received %d bytes.",
 605                 libusb_error_name(transfer->status), transfer->actual_length);
 606
 607         if (transfer->actual_length == 0)
 608                 /* Nothing to send to the bus. */
 609                 return;
 610
 611         unsigned samples_received = transfer->actual_length / NUM_CHANNELS;
 612         send_chunk(sdi, transfer->buffer, samples_received);
 613         devc->samp_received += samples_received;
 614
 615         g_free(transfer->buffer);
 616         libusb_free_transfer(transfer);
 617
 618         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 619                 sr_info("Requested number of samples reached, stopping. %"
 620                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 621                         devc->samp_received);
 622                 sr_dev_acquisition_stop(sdi);
 623         } else if (devc->limit_msec && (g_get_monotonic_time() -
 624                         devc->aq_started) / 1000 >= devc->limit_msec) {
 625                 sr_info("Requested time limit reached, stopping. %d <= %d",
 626                         (uint32_t)devc->limit_msec,
 627                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 628                 sr_dev_acquisition_stop(sdi);
 629         } else {
 630                 read_channel(sdi, data_amount(sdi));
 631         }
 632 }
 633
 634 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 635 {
 636         int ret;
 637         struct dev_context *devc;
 638
 639         devc = sdi->priv;
 640
 641         amount = MIN(amount, MAX_PACKET_SIZE);
 642         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 643         devc->read_start_ts = g_get_monotonic_time();
 644
 645         return ret;
 646 }
 647
 648 static int handle_event(int fd, int revents, void *cb_data)
 649 {
 650         const struct sr_dev_inst *sdi;
 651         struct timeval tv;
 652         struct sr_dev_driver *di;
 653         struct dev_context *devc;
 654         struct drv_context *drvc;
 655
 656         (void)fd;
 657         (void)revents;
 658
 659         sdi = cb_data;
 660         di = sdi->driver;
 661         drvc = di->context;
 662         devc = sdi->priv;
 663
 664         /* Always handle pending libusb events. */
 665         tv.tv_sec = tv.tv_usec = 0;
 666         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 667
 668         if (devc->dev_state == STOPPING) {
 669                 /* We've been told to wind up the acquisition. */
 670                 sr_dbg("Stopping acquisition.");
 671
 672                 hantek_6xxx_stop_data_collecting(sdi);
 673                 /*
 674                  * TODO: Doesn't really cancel pending transfers so they might
 675                  * come in after SR_DF_END is sent.
 676                  */
 677                 usb_source_remove(sdi->session, drvc->sr_ctx);
 678
 679                 std_session_send_df_end(sdi);
 680
 681                 devc->dev_state = IDLE;
 682
 683                 return TRUE;
 684         }
 685
 686         return TRUE;
 687 }
 688
 689 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 690 {
 691         struct dev_context *devc;
 692         struct sr_dev_driver *di = sdi->driver;
 693         struct drv_context *drvc = di->context;
 694
 695         devc = sdi->priv;
 696
 697         if (configure_channels(sdi) != SR_OK) {
 698                 sr_err("Failed to configure channels.");
 699                 return SR_ERR;
 700         }
 701
 702         if (hantek_6xxx_init(sdi) != SR_OK)
 703                 return SR_ERR;
 704
 705         std_session_send_df_header(sdi);
 706
 707         devc->samp_received = 0;
 708         devc->dev_state = FLUSH;
 709
 710         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 711                        handle_event, (void *)sdi);
 712
 713         hantek_6xxx_start_data_collecting(sdi);
 714
 715         read_channel(sdi, FLUSH_PACKET_SIZE);
 716
 717         return SR_OK;
 718 }
 719
 720 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 721 {
 722         struct dev_context *devc;
 723
 724         devc = sdi->priv;
 725         devc->dev_state = STOPPING;
 726
 727         return SR_OK;
 728 }
 729
 730 static struct sr_dev_driver hantek_6xxx_driver_info = {
 731         .name = "hantek-6xxx",
 732         .longname = "Hantek 6xxx",
 733         .api_version = 1,
 734         .init = std_init,
 735         .cleanup = std_cleanup,
 736         .scan = scan,
 737         .dev_list = std_dev_list,
 738         .dev_clear = dev_clear,
 739         .config_get = config_get,
 740         .config_set = config_set,
 741         .config_list = config_list,
 742         .dev_open = dev_open,
 743         .dev_close = dev_close,
 744         .dev_acquisition_start = dev_acquisition_start,
 745         .dev_acquisition_stop = dev_acquisition_stop,
 746         .context = NULL,
 747 };
 748 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);