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                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  65                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  66                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  67         },
  68         {
  69                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  70                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  71                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  72         },
  73         {
  74                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  75                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  76                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  77         },
  78         ALL_ZERO
  79 };
  80
  81 static const uint64_t samplerates[] = {
  82         SAMPLERATE_VALUES
  83 };
  84
  85 static const uint64_t vdivs[][2] = {
  86         VDIV_VALUES
  87 };
  88
  89 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  90
  91 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  92 {
  93         struct sr_dev_inst *sdi;
  94         struct sr_channel *ch;
  95         struct sr_channel_group *cg;
  96         struct dev_context *devc;
  97         unsigned int i;
  98
  99         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 100         sdi->status = SR_ST_INITIALIZING;
 101         sdi->vendor = g_strdup(prof->vendor);
 102         sdi->model = g_strdup(prof->model);
 103
 104         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 105                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 106                 cg = g_malloc0(sizeof(struct sr_channel_group));
 107                 cg->name = g_strdup(channel_names[i]);
 108                 cg->channels = g_slist_append(cg->channels, ch);
 109                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 110         }
 111
 112         devc = g_malloc0(sizeof(struct dev_context));
 113
 114         for (i = 0; i < NUM_CHANNELS; i++) {
 115                 devc->ch_enabled[i] = TRUE;
 116                 devc->voltage[i] = DEFAULT_VOLTAGE;
 117                 devc->coupling[i] = DEFAULT_COUPLING;
 118         }
 119         devc->coupling_vals = prof->coupling_vals;
 120         devc->coupling_tab_size = prof->coupling_tab_size;
 121         devc->has_coupling = prof->has_coupling;
 122
 123         devc->sample_buf = NULL;
 124         devc->sample_buf_write = 0;
 125         devc->sample_buf_size = 0;
 126
 127         devc->profile = prof;
 128         devc->dev_state = IDLE;
 129         devc->samplerate = DEFAULT_SAMPLERATE;
 130
 131         sdi->priv = devc;
 132
 133         return sdi;
 134 }
 135
 136 static int configure_channels(const struct sr_dev_inst *sdi)
 137 {
 138         struct dev_context *devc;
 139         const GSList *l;
 140         int p;
 141         struct sr_channel *ch;
 142         devc = sdi->priv;
 143
 144         g_slist_free(devc->enabled_channels);
 145         devc->enabled_channels = NULL;
 146         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 147
 148         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 149                 ch = l->data;
 150                 if (p < NUM_CHANNELS) {
 151                         devc->ch_enabled[p] = ch->enabled;
 152                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 153                 }
 154         }
 155
 156         return SR_OK;
 157 }
 158
 159 static void clear_helper(struct dev_context *devc)
 160 {
 161         g_slist_free(devc->enabled_channels);
 162 }
 163
 164 static int dev_clear(const struct sr_dev_driver *di)
 165 {
 166         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 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                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 246                                 /* Device matches the post-firmware profile. */
 247                                 prof = &dev_profiles[j];
 248                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 249                                 sdi = hantek_6xxx_dev_new(prof);
 250                                 sdi->connection_id = g_strdup(connection_id);
 251                                 sdi->status = SR_ST_INACTIVE;
 252                                 devices = g_slist_append(devices, sdi);
 253                                 sdi->inst_type = SR_INST_USB;
 254                                 sdi->conn = sr_usb_dev_inst_new(
 255                                                 libusb_get_bus_number(devlist[i]),
 256                                                 libusb_get_device_address(devlist[i]), NULL);
 257                                 break;
 258                         }
 259                 }
 260                 if (!prof)
 261                         /* Not a supported VID/PID. */
 262                         continue;
 263         }
 264         libusb_free_device_list(devlist, 1);
 265
 266         return std_scan_complete(di, devices);
 267 }
 268
 269 static int dev_open(struct sr_dev_inst *sdi)
 270 {
 271         struct dev_context *devc;
 272         struct sr_usb_dev_inst *usb;
 273         int64_t timediff_us, timediff_ms;
 274         int err;
 275
 276         devc = sdi->priv;
 277         usb = sdi->conn;
 278
 279         /*
 280          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 281          * for the FX2 to renumerate.
 282          */
 283         err = SR_ERR;
 284         if (devc->fw_updated > 0) {
 285                 sr_info("Waiting for device to reset.");
 286                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 287                 g_usleep(300 * 1000);
 288                 timediff_ms = 0;
 289                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 290                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 291                                 break;
 292                         g_usleep(100 * 1000);
 293                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 294                         timediff_ms = timediff_us / 1000;
 295                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 296                 }
 297                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 298                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 299         } else {
 300                 err = hantek_6xxx_open(sdi);
 301         }
 302
 303         if (err != SR_OK) {
 304                 sr_err("Unable to open device.");
 305                 return SR_ERR;
 306         }
 307
 308         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 309         if (err != 0) {
 310                 sr_err("Unable to claim interface: %s.",
 311                         libusb_error_name(err));
 312                 return SR_ERR;
 313         }
 314
 315         return SR_OK;
 316 }
 317
 318 static int dev_close(struct sr_dev_inst *sdi)
 319 {
 320         hantek_6xxx_close(sdi);
 321
 322         return SR_OK;
 323 }
 324
 325 static int config_get(uint32_t key, GVariant **data,
 326         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 327 {
 328         struct dev_context *devc;
 329         struct sr_usb_dev_inst *usb;
 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                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 363                         break;
 364                 default:
 365                         return SR_ERR_NA;
 366                 }
 367         } else {
 368                 if (sdi->channel_groups->data == cg)
 369                         ch_idx = 0;
 370                 else if (sdi->channel_groups->next->data == cg)
 371                         ch_idx = 1;
 372                 else
 373                         return SR_ERR_ARG;
 374                 switch (key) {
 375                 case SR_CONF_VDIV:
 376                         vdiv = vdivs[devc->voltage[ch_idx]];
 377                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 378                         break;
 379                 case SR_CONF_COUPLING:
 380                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 381                                         == COUPLING_DC) ? "DC" : "AC");
 382                         break;
 383                 }
 384         }
 385
 386         return SR_OK;
 387 }
 388
 389 static int config_set(uint32_t key, GVariant *data,
 390         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 391 {
 392         struct dev_context *devc;
 393         uint64_t p, q;
 394         int tmp_int, ch_idx;
 395         unsigned int i;
 396         const char *tmp_str;
 397
 398         devc = sdi->priv;
 399         if (!cg) {
 400                 switch (key) {
 401                 case SR_CONF_SAMPLERATE:
 402                         devc->samplerate = g_variant_get_uint64(data);
 403                         hantek_6xxx_update_samplerate(sdi);
 404                         break;
 405                 case SR_CONF_LIMIT_MSEC:
 406                         devc->limit_msec = g_variant_get_uint64(data);
 407                         break;
 408                 case SR_CONF_LIMIT_SAMPLES:
 409                         devc->limit_samples = g_variant_get_uint64(data);
 410                         break;
 411                 default:
 412                         return SR_ERR_NA;
 413                 }
 414         } else {
 415                 if (sdi->channel_groups->data == cg)
 416                         ch_idx = 0;
 417                 else if (sdi->channel_groups->next->data == cg)
 418                         ch_idx = 1;
 419                 else
 420                         return SR_ERR_ARG;
 421                 switch (key) {
 422                 case SR_CONF_VDIV:
 423                         g_variant_get(data, "(tt)", &p, &q);
 424                         tmp_int = -1;
 425                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 426                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 427                                         tmp_int = i;
 428                                         break;
 429                                 }
 430                         }
 431                         if (tmp_int >= 0) {
 432                                 devc->voltage[ch_idx] = tmp_int;
 433                                 hantek_6xxx_update_vdiv(sdi);
 434                         } else
 435                                 return SR_ERR_ARG;
 436                         break;
 437                 case SR_CONF_COUPLING:
 438                         tmp_str = g_variant_get_string(data, NULL);
 439                         for (i = 0; i < devc->coupling_tab_size; i++) {
 440                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 441                                         devc->coupling[ch_idx] = i;
 442                                         break;
 443                                 }
 444                         }
 445                         if (i == devc->coupling_tab_size)
 446                                 return SR_ERR_ARG;
 447                         break;
 448                 default:
 449                         return SR_ERR_NA;
 450                 }
 451         }
 452
 453         return SR_OK;
 454 }
 455
 456 static int config_list(uint32_t key, GVariant **data,
 457         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 458 {
 459         struct dev_context *devc;
 460
 461         devc = (sdi) ? sdi->priv : NULL;
 462
 463         if (!cg) {
 464                 switch (key) {
 465                 case SR_CONF_SCAN_OPTIONS:
 466                 case SR_CONF_DEVICE_OPTIONS:
 467                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 468                 case SR_CONF_SAMPLERATE:
 469                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 470                         break;
 471                 default:
 472                         return SR_ERR_NA;
 473                 }
 474         } else {
 475                 switch (key) {
 476                 case SR_CONF_DEVICE_OPTIONS:
 477                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 478                         break;
 479                 case SR_CONF_COUPLING:
 480                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 481                         break;
 482                 case SR_CONF_VDIV:
 483                         *data = std_gvar_tuple_array(ARRAY_AND_SIZE(vdivs));
 484                         break;
 485                 default:
 486                         return SR_ERR_NA;
 487                 }
 488         }
 489
 490         return SR_OK;
 491 }
 492
 493 /* Minimise data amount for limit_samples and limit_msec limits. */
 494 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 495 {
 496         struct dev_context *devc = sdi->priv;
 497         uint32_t data_left, data_left_2, i;
 498         int32_t time_left;
 499
 500         if (devc->limit_msec) {
 501                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 502                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 503         } else if (devc->limit_samples) {
 504                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 505         } else {
 506                 data_left = devc->samplerate * NUM_CHANNELS;
 507         }
 508
 509         /* Round up to nearest power of two. */
 510         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 511                 ;
 512         data_left_2 = i;
 513
 514         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 515
 516         return data_left_2;
 517 }
 518
 519 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 520                 int num_samples)
 521 {
 522         struct sr_datafeed_packet packet;
 523         struct sr_datafeed_analog analog;
 524         struct sr_analog_encoding encoding;
 525         struct sr_analog_meaning meaning;
 526         struct sr_analog_spec spec;
 527         struct dev_context *devc = sdi->priv;
 528         GSList *channels = devc->enabled_channels;
 529
 530         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 531         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 532
 533         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 534
 535         packet.type = SR_DF_ANALOG;
 536         packet.payload = &analog;
 537
 538         analog.num_samples = num_samples;
 539         analog.meaning->mq = SR_MQ_VOLTAGE;
 540         analog.meaning->unit = SR_UNIT_VOLT;
 541         analog.meaning->mqflags = 0;
 542
 543         analog.data = g_try_malloc(num_samples * sizeof(float));
 544         if (!analog.data) {
 545                 sr_err("Analog data buffer malloc failed.");
 546                 devc->dev_state = STOPPING;
 547                 return;
 548         }
 549
 550         for (int ch = 0; ch < 2; ch++) {
 551                 if (!devc->ch_enabled[ch])
 552                         continue;
 553
 554                 float vdivlog = log10f(ch_bit[ch]);
 555                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 556                 analog.encoding->digits = digits;
 557                 analog.spec->spec_digits = digits;
 558                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 559
 560                 for (int i = 0; i < num_samples; i++) {
 561                         /*
 562                          * The device always sends data for both channels. If a channel
 563                          * is disabled, it contains a copy of the enabled channel's
 564                          * data. However, we only send the requested channels to
 565                          * the bus.
 566                          *
 567                          * Voltage values are encoded as a value 0-255, where the
 568                          * value is a point in the range represented by the vdiv
 569                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 570                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 571                          */
 572                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 573                 }
 574
 575                 sr_session_send(sdi, &packet);
 576                 g_slist_free(analog.meaning->channels);
 577
 578                 channels = channels->next;
 579         }
 580         g_free(analog.data);
 581 }
 582
 583 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 584 {
 585         int i = 0;
 586         uint64_t send = 0;
 587         uint32_t chunk;
 588
 589         while (send < samples) {
 590                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 591                 send += chunk;
 592                 send_chunk(sdi, buf[i]->buffer, chunk);
 593
 594                 /*
 595                  * Everything in this transfer was either copied to the buffer
 596                  * or sent to the session bus.
 597                  */
 598                 g_free(buf[i]->buffer);
 599                 libusb_free_transfer(buf[i]);
 600                 i++;
 601         }
 602 }
 603
 604 /*
 605  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 606  * Only channel data comes in asynchronously, and all transfers for this are
 607  * queued up beforehand, so this just needs to chuck the incoming data onto
 608  * the libsigrok session bus.
 609  */
 610 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 611 {
 612         struct sr_dev_inst *sdi;
 613         struct dev_context *devc;
 614
 615         sdi = transfer->user_data;
 616         devc = sdi->priv;
 617
 618         if (devc->dev_state == FLUSH) {
 619                 g_free(transfer->buffer);
 620                 libusb_free_transfer(transfer);
 621                 devc->dev_state = CAPTURE;
 622                 devc->aq_started = g_get_monotonic_time();
 623                 read_channel(sdi, data_amount(sdi));
 624                 return;
 625         }
 626
 627         if (devc->dev_state != CAPTURE)
 628                 return;
 629
 630         if (!devc->sample_buf) {
 631                 devc->sample_buf_size = 10;
 632                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 633                 devc->sample_buf_write = 0;
 634         }
 635
 636         if (devc->sample_buf_write >= devc->sample_buf_size) {
 637                 devc->sample_buf_size += 10;
 638                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 639                                 devc->sample_buf_size * sizeof(transfer));
 640                 if (!devc->sample_buf) {
 641                         sr_err("Sample buffer malloc failed.");
 642                         devc->dev_state = STOPPING;
 643                         return;
 644                 }
 645         }
 646
 647         devc->sample_buf[devc->sample_buf_write++] = transfer;
 648         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 649
 650         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 651                 (uint64_t)(transfer->actual_length * 1000 /
 652                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 653                 NUM_CHANNELS));
 654
 655         sr_spew("receive_transfer(): status %s received %d bytes.",
 656                 libusb_error_name(transfer->status), transfer->actual_length);
 657
 658         if (transfer->actual_length == 0)
 659                 /* Nothing to send to the bus. */
 660                 return;
 661
 662         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 663                 sr_info("Requested number of samples reached, stopping. %"
 664                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 665                         devc->samp_received);
 666                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 667                 sr_dev_acquisition_stop(sdi);
 668         } else if (devc->limit_msec && (g_get_monotonic_time() -
 669                         devc->aq_started) / 1000 >= devc->limit_msec) {
 670                 sr_info("Requested time limit reached, stopping. %d <= %d",
 671                         (uint32_t)devc->limit_msec,
 672                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 673                 send_data(sdi, devc->sample_buf, devc->samp_received);
 674                 g_free(devc->sample_buf);
 675                 devc->sample_buf = NULL;
 676                 sr_dev_acquisition_stop(sdi);
 677         } else {
 678                 read_channel(sdi, data_amount(sdi));
 679         }
 680 }
 681
 682 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 683 {
 684         int ret;
 685         struct dev_context *devc;
 686
 687         devc = sdi->priv;
 688
 689         amount = MIN(amount, MAX_PACKET_SIZE);
 690         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 691         devc->read_start_ts = g_get_monotonic_time();
 692         devc->read_data_amount = amount;
 693
 694         return ret;
 695 }
 696
 697 static int handle_event(int fd, int revents, void *cb_data)
 698 {
 699         const struct sr_dev_inst *sdi;
 700         struct timeval tv;
 701         struct sr_dev_driver *di;
 702         struct dev_context *devc;
 703         struct drv_context *drvc;
 704
 705         (void)fd;
 706         (void)revents;
 707
 708         sdi = cb_data;
 709         di = sdi->driver;
 710         drvc = di->context;
 711         devc = sdi->priv;
 712
 713         /* Always handle pending libusb events. */
 714         tv.tv_sec = tv.tv_usec = 0;
 715         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 716
 717         if (devc->dev_state == STOPPING) {
 718                 /* We've been told to wind up the acquisition. */
 719                 sr_dbg("Stopping acquisition.");
 720
 721                 hantek_6xxx_stop_data_collecting(sdi);
 722                 /*
 723                  * TODO: Doesn't really cancel pending transfers so they might
 724                  * come in after SR_DF_END is sent.
 725                  */
 726                 usb_source_remove(sdi->session, drvc->sr_ctx);
 727
 728                 std_session_send_df_end(sdi);
 729
 730                 devc->dev_state = IDLE;
 731
 732                 return TRUE;
 733         }
 734
 735         return TRUE;
 736 }
 737
 738 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 739 {
 740         struct dev_context *devc;
 741         struct sr_dev_driver *di = sdi->driver;
 742         struct drv_context *drvc = di->context;
 743
 744         devc = sdi->priv;
 745
 746         if (configure_channels(sdi) != SR_OK) {
 747                 sr_err("Failed to configure channels.");
 748                 return SR_ERR;
 749         }
 750
 751         if (hantek_6xxx_init(sdi) != SR_OK)
 752                 return SR_ERR;
 753
 754         std_session_send_df_header(sdi);
 755
 756         devc->samp_received = 0;
 757         devc->dev_state = FLUSH;
 758
 759         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 760                        handle_event, (void *)sdi);
 761
 762         hantek_6xxx_start_data_collecting(sdi);
 763
 764         read_channel(sdi, FLUSH_PACKET_SIZE);
 765
 766         return SR_OK;
 767 }
 768
 769 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 770 {
 771         struct dev_context *devc;
 772
 773         devc = sdi->priv;
 774         devc->dev_state = STOPPING;
 775
 776         g_free(devc->sample_buf);
 777         devc->sample_buf = NULL;
 778
 779         return SR_OK;
 780 }
 781
 782 static struct sr_dev_driver hantek_6xxx_driver_info = {
 783         .name = "hantek-6xxx",
 784         .longname = "Hantek 6xxx",
 785         .api_version = 1,
 786         .init = std_init,
 787         .cleanup = std_cleanup,
 788         .scan = scan,
 789         .dev_list = std_dev_list,
 790         .dev_clear = dev_clear,
 791         .config_get = config_get,
 792         .config_set = config_set,
 793         .config_list = config_list,
 794         .dev_open = dev_open,
 795         .dev_close = dev_close,
 796         .dev_acquisition_start = dev_acquisition_start,
 797         .dev_acquisition_stop = dev_acquisition_stop,
 798         .context = NULL,
 799 };
 800 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);