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 "protocol.h"
  22
  23 /* Max time in ms before we want to check on USB events */
  24 #define TICK 200
  25
  26 #define RANGE(ch) (((float)vdivs[devc->voltage[ch]][0] / vdivs[devc->voltage[ch]][1]) * VDIV_MULTIPLIER)
  27
  28 static const uint32_t scanopts[] = {
  29         SR_CONF_CONN,
  30 };
  31
  32 static const uint32_t drvopts[] = {
  33         SR_CONF_OSCILLOSCOPE,
  34 };
  35
  36 static const uint32_t devopts[] = {
  37         SR_CONF_CONN | SR_CONF_GET,
  38         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  39         SR_CONF_NUM_VDIV | SR_CONF_GET,
  40         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  41         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  42 };
  43
  44 static const uint32_t devopts_cg[] = {
  45         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  46         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47 };
  48
  49 static const char *channel_names[] = {
  50         "CH1", "CH2",
  51 };
  52
  53 static const char *dc_coupling[] = {
  54         "DC", "DC",
  55 };
  56
  57 static const char *acdc_coupling[] = {
  58         "AC", "DC",
  59 };
  60
  61 static const struct hantek_6xxx_profile dev_profiles[] = {
  62         {
  63                 0x04b4, 0x6022, 0x04b5, 0x6022,
  64                 "Hantek", "6022BE", "hantek-6022be.fw",
  65                 dc_coupling, ARRAY_SIZE(dc_coupling),
  66         },
  67         {
  68                 0x8102, 0x8102, 0x1D50, 0x608E,
  69                 "Sainsmart", "DDS120", "sainsmart-dds120.fw",
  70                 acdc_coupling, ARRAY_SIZE(acdc_coupling),
  71         },
  72         ALL_ZERO
  73 };
  74
  75 static const uint64_t samplerates[] = {
  76         SAMPLERATE_VALUES
  77 };
  78
  79 static const uint64_t vdivs[][2] = {
  80         VDIV_VALUES
  81 };
  82
  83 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  84
  85 static int dev_acquisition_stop(struct sr_dev_inst *sdi);
  86
  87 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  88 {
  89         struct sr_dev_inst *sdi;
  90         struct sr_channel *ch;
  91         struct sr_channel_group *cg;
  92         struct dev_context *devc;
  93         unsigned int i;
  94
  95         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  96         sdi->status = SR_ST_INITIALIZING;
  97         sdi->vendor = g_strdup(prof->vendor);
  98         sdi->model = g_strdup(prof->model);
  99
 100         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 101                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 102                 cg = g_malloc0(sizeof(struct sr_channel_group));
 103                 cg->name = g_strdup(channel_names[i]);
 104                 cg->channels = g_slist_append(cg->channels, ch);
 105                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 106         }
 107
 108         devc = g_malloc0(sizeof(struct dev_context));
 109
 110         for (i = 0; i < NUM_CHANNELS; i++) {
 111                 devc->ch_enabled[i] = TRUE;
 112                 devc->voltage[i] = DEFAULT_VOLTAGE;
 113                 devc->coupling[i] = DEFAULT_COUPLING;
 114         }
 115         devc->coupling_vals = prof->coupling_vals;
 116         devc->coupling_tab_size = prof->coupling_tab_size;
 117
 118         devc->sample_buf = NULL;
 119         devc->sample_buf_write = 0;
 120         devc->sample_buf_size = 0;
 121
 122         devc->profile = prof;
 123         devc->dev_state = IDLE;
 124         devc->samplerate = DEFAULT_SAMPLERATE;
 125
 126         sdi->priv = devc;
 127
 128         return sdi;
 129 }
 130
 131 static int configure_channels(const struct sr_dev_inst *sdi)
 132 {
 133         struct dev_context *devc;
 134         const GSList *l;
 135         int p;
 136         struct sr_channel *ch;
 137         devc = sdi->priv;
 138
 139         g_slist_free(devc->enabled_channels);
 140         devc->enabled_channels = NULL;
 141         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 142
 143         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 144                 ch = l->data;
 145                 if (p < NUM_CHANNELS) {
 146                         devc->ch_enabled[p] = ch->enabled;
 147                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 148                 }
 149         }
 150
 151         return SR_OK;
 152 }
 153
 154 static void clear_dev_context(void *priv)
 155 {
 156         struct dev_context *devc;
 157
 158         devc = priv;
 159         g_slist_free(devc->enabled_channels);
 160         g_free(devc);
 161 }
 162
 163 static int dev_clear(const struct sr_dev_driver *di)
 164 {
 165         return std_dev_clear(di, clear_dev_context);
 166 }
 167
 168 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 169 {
 170         struct drv_context *drvc;
 171         struct dev_context *devc;
 172         struct sr_dev_inst *sdi;
 173         struct sr_usb_dev_inst *usb;
 174         struct sr_config *src;
 175         const struct hantek_6xxx_profile *prof;
 176         GSList *l, *devices, *conn_devices;
 177         struct libusb_device_descriptor des;
 178         libusb_device **devlist;
 179         int i, j;
 180         const char *conn;
 181         char connection_id[64];
 182
 183         drvc = di->context;
 184
 185         devices = 0;
 186
 187         conn = NULL;
 188         for (l = options; l; l = l->next) {
 189                 src = l->data;
 190                 if (src->key == SR_CONF_CONN) {
 191                         conn = g_variant_get_string(src->data, NULL);
 192                         break;
 193                 }
 194         }
 195         if (conn)
 196                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 197         else
 198                 conn_devices = NULL;
 199
 200         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 201         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 202         for (i = 0; devlist[i]; i++) {
 203                 if (conn) {
 204                         usb = NULL;
 205                         for (l = conn_devices; l; l = l->next) {
 206                                 usb = l->data;
 207                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 208                                         && usb->address == libusb_get_device_address(devlist[i]))
 209                                         break;
 210                         }
 211                         if (!l)
 212                                 /* This device matched none of the ones that
 213                                  * matched the conn specification. */
 214                                 continue;
 215                 }
 216
 217                 libusb_get_device_descriptor(devlist[i], &des);
 218
 219                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 220
 221                 prof = NULL;
 222                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 223                         if (des.idVendor == dev_profiles[j].orig_vid
 224                                 && des.idProduct == dev_profiles[j].orig_pid) {
 225                                 /* Device matches the pre-firmware profile. */
 226                                 prof = &dev_profiles[j];
 227                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 228                                 sdi = hantek_6xxx_dev_new(prof);
 229                                 sdi->connection_id = g_strdup(connection_id);
 230                                 devices = g_slist_append(devices, sdi);
 231                                 devc = sdi->priv;
 232                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 233                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 234                                         /* Remember when the firmware on this device was updated. */
 235                                         devc->fw_updated = g_get_monotonic_time();
 236                                 else
 237                                         sr_err("Firmware upload failed.");
 238                                 /* Dummy USB address of 0xff will get overwritten later. */
 239                                 sdi->conn = sr_usb_dev_inst_new(
 240                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 241                                 break;
 242                         } else if (des.idVendor == dev_profiles[j].fw_vid
 243                                 && des.idProduct == dev_profiles[j].fw_pid) {
 244                                 /* Device matches the post-firmware profile. */
 245                                 prof = &dev_profiles[j];
 246                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 247                                 sdi = hantek_6xxx_dev_new(prof);
 248                                 sdi->connection_id = g_strdup(connection_id);
 249                                 sdi->status = SR_ST_INACTIVE;
 250                                 devices = g_slist_append(devices, sdi);
 251                                 sdi->inst_type = SR_INST_USB;
 252                                 sdi->conn = sr_usb_dev_inst_new(
 253                                                 libusb_get_bus_number(devlist[i]),
 254                                                 libusb_get_device_address(devlist[i]), NULL);
 255                                 break;
 256                         }
 257                 }
 258                 if (!prof)
 259                         /* Not a supported VID/PID. */
 260                         continue;
 261         }
 262         libusb_free_device_list(devlist, 1);
 263
 264         return std_scan_complete(di, devices);
 265 }
 266
 267 static int dev_open(struct sr_dev_inst *sdi)
 268 {
 269         struct dev_context *devc;
 270         struct sr_usb_dev_inst *usb;
 271         int64_t timediff_us, timediff_ms;
 272         int err;
 273
 274         devc = sdi->priv;
 275         usb = sdi->conn;
 276
 277         /*
 278          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 279          * for the FX2 to renumerate.
 280          */
 281         err = SR_ERR;
 282         if (devc->fw_updated > 0) {
 283                 sr_info("Waiting for device to reset.");
 284                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 285                 g_usleep(300 * 1000);
 286                 timediff_ms = 0;
 287                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 288                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 289                                 break;
 290                         g_usleep(100 * 1000);
 291                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 292                         timediff_ms = timediff_us / 1000;
 293                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 294                 }
 295                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 296                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 297         } else {
 298                 err = hantek_6xxx_open(sdi);
 299         }
 300
 301         if (err != SR_OK) {
 302                 sr_err("Unable to open device.");
 303                 return SR_ERR;
 304         }
 305
 306         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 307         if (err != 0) {
 308                 sr_err("Unable to claim interface: %s.",
 309                            libusb_error_name(err));
 310                 return SR_ERR;
 311         }
 312
 313         return SR_OK;
 314 }
 315
 316 static int dev_close(struct sr_dev_inst *sdi)
 317 {
 318         hantek_6xxx_close(sdi);
 319
 320         return SR_OK;
 321 }
 322
 323 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 324                 const struct sr_channel_group *cg)
 325 {
 326         struct dev_context *devc;
 327         struct sr_usb_dev_inst *usb;
 328         char str[128];
 329         const uint64_t *vdiv;
 330         int ch_idx;
 331
 332         switch (key) {
 333         case SR_CONF_NUM_VDIV:
 334                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 335                 break;
 336         }
 337
 338         if (!sdi)
 339                 return SR_ERR_ARG;
 340
 341         devc = sdi->priv;
 342         if (!cg) {
 343                 switch (key) {
 344                 case SR_CONF_SAMPLERATE:
 345                         *data = g_variant_new_uint64(devc->samplerate);
 346                         break;
 347                 case SR_CONF_LIMIT_MSEC:
 348                         *data = g_variant_new_uint64(devc->limit_msec);
 349                         break;
 350                 case SR_CONF_LIMIT_SAMPLES:
 351                         *data = g_variant_new_uint64(devc->limit_samples);
 352                         break;
 353                 case SR_CONF_CONN:
 354                         if (!sdi->conn)
 355                                 return SR_ERR_ARG;
 356                         usb = sdi->conn;
 357                         if (usb->address == 255)
 358                                 /* Device still needs to re-enumerate after firmware
 359                                  * upload, so we don't know its (future) address. */
 360                                 return SR_ERR;
 361                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 362                         *data = g_variant_new_string(str);
 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_vals[devc->coupling[ch_idx]]);
 381                         break;
 382                 }
 383         }
 384
 385         return SR_OK;
 386 }
 387
 388 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 389                 const struct sr_channel_group *cg)
 390 {
 391         struct dev_context *devc;
 392         uint64_t p, q;
 393         int tmp_int, ch_idx, ret;
 394         unsigned int i;
 395         const char *tmp_str;
 396
 397         if (sdi->status != SR_ST_ACTIVE)
 398                 return SR_ERR_DEV_CLOSED;
 399
 400         ret = SR_OK;
 401         devc = sdi->priv;
 402         if (!cg) {
 403                 switch (key) {
 404                 case SR_CONF_SAMPLERATE:
 405                         devc->samplerate = g_variant_get_uint64(data);
 406                         hantek_6xxx_update_samplerate(sdi);
 407                         break;
 408                 case SR_CONF_LIMIT_MSEC:
 409                         devc->limit_msec = g_variant_get_uint64(data);
 410                         break;
 411                 case SR_CONF_LIMIT_SAMPLES:
 412                         devc->limit_samples = g_variant_get_uint64(data);
 413                         break;
 414                 default:
 415                         ret = SR_ERR_NA;
 416                         break;
 417                 }
 418         } else {
 419                 if (sdi->channel_groups->data == cg)
 420                         ch_idx = 0;
 421                 else if (sdi->channel_groups->next->data == cg)
 422                         ch_idx = 1;
 423                 else
 424                         return SR_ERR_ARG;
 425                 switch (key) {
 426                 case SR_CONF_VDIV:
 427                         g_variant_get(data, "(tt)", &p, &q);
 428                         tmp_int = -1;
 429                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 430                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 431                                         tmp_int = i;
 432                                         break;
 433                                 }
 434                         }
 435                         if (tmp_int >= 0) {
 436                                 devc->voltage[ch_idx] = tmp_int;
 437                                 hantek_6xxx_update_vdiv(sdi);
 438                         } else
 439                                 ret = SR_ERR_ARG;
 440                         break;
 441                 case SR_CONF_COUPLING:
 442                         tmp_str = g_variant_get_string(data, NULL);
 443                         for (i = 0; devc->coupling_vals[i]; i++) {
 444                                 if (!strcmp(tmp_str, devc->coupling_vals[i])) {
 445                                         devc->coupling[ch_idx] = i;
 446                                         break;
 447                                 }
 448                         }
 449                         if (devc->coupling_vals[i] == 0)
 450                                 ret = SR_ERR_ARG;
 451                         break;
 452                 default:
 453                         ret = SR_ERR_NA;
 454                         break;
 455                 }
 456         }
 457
 458         return ret;
 459 }
 460
 461 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 462                 const struct sr_channel_group *cg)
 463 {
 464         GVariant *tuple, *rational[2];
 465         GVariantBuilder gvb;
 466         unsigned int i;
 467         GVariant *gvar;
 468         struct dev_context *devc;
 469
 470         if (key == SR_CONF_SCAN_OPTIONS) {
 471                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 472                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 473                 return SR_OK;
 474         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 475                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 476                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 477                 return SR_OK;
 478         }
 479
 480         if (!sdi)
 481                 return SR_ERR_ARG;
 482
 483         devc = sdi->priv;
 484
 485         if (!cg) {
 486                 switch (key) {
 487                 case SR_CONF_DEVICE_OPTIONS:
 488                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 489                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 490                         break;
 491                 case SR_CONF_SAMPLERATE:
 492                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 493                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 494                                 samplerates, ARRAY_SIZE(samplerates),
 495                                 sizeof(uint64_t));
 496                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 497                         *data = g_variant_builder_end(&gvb);
 498                         break;
 499                 default:
 500                         return SR_ERR_NA;
 501                 }
 502         } else {
 503                 switch (key) {
 504                 case SR_CONF_DEVICE_OPTIONS:
 505                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 506                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 507                         break;
 508                 case SR_CONF_COUPLING:
 509                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 510                         break;
 511                 case SR_CONF_VDIV:
 512                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 513                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 514                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 515                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 516                                 tuple = g_variant_new_tuple(rational, 2);
 517                                 g_variant_builder_add_value(&gvb, tuple);
 518                         }
 519                         *data = g_variant_builder_end(&gvb);
 520                         break;
 521                 default:
 522                         return SR_ERR_NA;
 523                 }
 524         }
 525
 526         return SR_OK;
 527 }
 528
 529 /* Minimise data amount for limit_samples and limit_msec limits. */
 530 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 531 {
 532         struct dev_context *devc = sdi->priv;
 533         uint32_t data_left, data_left_2, i;
 534         int32_t time_left;
 535
 536         if (devc->limit_msec) {
 537                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 538                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 539         } else if (devc->limit_samples) {
 540                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 541         } else {
 542                 data_left = devc->samplerate * NUM_CHANNELS;
 543         }
 544
 545         /* Round up to nearest power of two. */
 546         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 547                 ;
 548         data_left_2 = i;
 549
 550         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 551
 552         return data_left_2;
 553 }
 554
 555 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 556                 int num_samples)
 557 {
 558         struct sr_datafeed_packet packet;
 559         struct sr_datafeed_analog analog;
 560         struct sr_analog_encoding encoding;
 561         struct sr_analog_meaning meaning;
 562         struct sr_analog_spec spec;
 563         struct dev_context *devc = sdi->priv;
 564         int num_channels, data_offset, i;
 565
 566         const float ch1_bit = RANGE(0) / 255;
 567         const float ch2_bit = RANGE(1) / 255;
 568         const float ch1_center = RANGE(0) / 2;
 569         const float ch2_center = RANGE(1) / 2;
 570
 571         const gboolean ch1_ena = !!devc->ch_enabled[0];
 572         const gboolean ch2_ena = !!devc->ch_enabled[1];
 573
 574         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 575
 576         num_channels = (ch1_ena && ch2_ena) ? 2 : 1;
 577         packet.type = SR_DF_ANALOG;
 578         packet.payload = &analog;
 579
 580         analog.meaning->channels = devc->enabled_channels;
 581         analog.num_samples = num_samples;
 582         analog.meaning->mq = SR_MQ_VOLTAGE;
 583         analog.meaning->unit = SR_UNIT_VOLT;
 584         analog.meaning->mqflags = 0;
 585
 586         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_channels);
 587         if (!analog.data) {
 588                 sr_err("Analog data buffer malloc failed.");
 589                 devc->dev_state = STOPPING;
 590                 return;
 591         }
 592
 593         data_offset = 0;
 594         for (i = 0; i < num_samples; i++) {
 595                 /*
 596                  * The device always sends data for both channels. If a channel
 597                  * is disabled, it contains a copy of the enabled channel's
 598                  * data. However, we only send the requested channels to
 599                  * the bus.
 600                  *
 601                  * Voltage values are encoded as a value 0-255, where the
 602                  * value is a point in the range represented by the vdiv
 603                  * setting. There are 10 vertical divs, so e.g. 500mV/div
 604                  * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 605                  */
 606                 if (ch1_ena)
 607                         ((float *)analog.data)[data_offset++] = (ch1_bit * *(buf + i * 2) - ch1_center);
 608                 if (ch2_ena)
 609                         ((float *)analog.data)[data_offset++] = (ch2_bit * *(buf + i * 2 + 1) - ch2_center);
 610         }
 611
 612         sr_session_send(sdi, &packet);
 613         g_free(analog.data);
 614 }
 615
 616 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 617 {
 618         int i = 0;
 619         uint64_t send = 0;
 620         uint32_t chunk;
 621
 622         while (send < samples) {
 623                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 624                 send += chunk;
 625                 send_chunk(sdi, buf[i]->buffer, chunk);
 626
 627                 /*
 628                  * Everything in this transfer was either copied to the buffer
 629                  * or sent to the session bus.
 630                  */
 631                 g_free(buf[i]->buffer);
 632                 libusb_free_transfer(buf[i]);
 633                 i++;
 634         }
 635 }
 636
 637 /*
 638  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 639  * Only channel data comes in asynchronously, and all transfers for this are
 640  * queued up beforehand, so this just needs to chuck the incoming data onto
 641  * the libsigrok session bus.
 642  */
 643 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 644 {
 645         struct sr_dev_inst *sdi;
 646         struct dev_context *devc;
 647
 648         sdi = transfer->user_data;
 649         devc = sdi->priv;
 650
 651         if (devc->dev_state == FLUSH) {
 652                 g_free(transfer->buffer);
 653                 libusb_free_transfer(transfer);
 654                 devc->dev_state = CAPTURE;
 655                 devc->aq_started = g_get_monotonic_time();
 656                 read_channel(sdi, data_amount(sdi));
 657                 return;
 658         }
 659
 660         if (devc->dev_state != CAPTURE)
 661                 return;
 662
 663         if (!devc->sample_buf) {
 664                 devc->sample_buf_size = 10;
 665                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 666                 devc->sample_buf_write = 0;
 667         }
 668
 669         if (devc->sample_buf_write >= devc->sample_buf_size) {
 670                 devc->sample_buf_size += 10;
 671                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 672                                 devc->sample_buf_size * sizeof(transfer));
 673                 if (!devc->sample_buf) {
 674                         sr_err("Sample buffer malloc failed.");
 675                         devc->dev_state = STOPPING;
 676                         return;
 677                 }
 678         }
 679
 680         devc->sample_buf[devc->sample_buf_write++] = transfer;
 681         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 682
 683         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 684                 (uint64_t)(transfer->actual_length * 1000 /
 685                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 686                 NUM_CHANNELS));
 687
 688         sr_spew("receive_transfer(): status %s received %d bytes.",
 689                 libusb_error_name(transfer->status), transfer->actual_length);
 690
 691         if (transfer->actual_length == 0)
 692                 /* Nothing to send to the bus. */
 693                 return;
 694
 695         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 696                 sr_info("Requested number of samples reached, stopping. %"
 697                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 698                         devc->samp_received);
 699                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 700                 sdi->driver->dev_acquisition_stop(sdi);
 701         } else if (devc->limit_msec && (g_get_monotonic_time() -
 702                         devc->aq_started) / 1000 >= devc->limit_msec) {
 703                 sr_info("Requested time limit reached, stopping. %d <= %d",
 704                         (uint32_t)devc->limit_msec,
 705                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 706                 send_data(sdi, devc->sample_buf, devc->samp_received);
 707                 g_free(devc->sample_buf);
 708                 devc->sample_buf = NULL;
 709                 sdi->driver->dev_acquisition_stop(sdi);
 710         } else {
 711                 read_channel(sdi, data_amount(sdi));
 712         }
 713 }
 714
 715 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 716 {
 717         int ret;
 718         struct dev_context *devc;
 719
 720         devc = sdi->priv;
 721
 722         amount = MIN(amount, MAX_PACKET_SIZE);
 723         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 724         devc->read_start_ts = g_get_monotonic_time();
 725         devc->read_data_amount = amount;
 726
 727         return ret;
 728 }
 729
 730 static int handle_event(int fd, int revents, void *cb_data)
 731 {
 732         const struct sr_dev_inst *sdi;
 733         struct timeval tv;
 734         struct sr_dev_driver *di;
 735         struct dev_context *devc;
 736         struct drv_context *drvc;
 737
 738         (void)fd;
 739         (void)revents;
 740
 741         sdi = cb_data;
 742         di = sdi->driver;
 743         drvc = di->context;
 744         devc = sdi->priv;
 745
 746         /* Always handle pending libusb events. */
 747         tv.tv_sec = tv.tv_usec = 0;
 748         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 749
 750         if (devc->dev_state == STOPPING) {
 751                 /* We've been told to wind up the acquisition. */
 752                 sr_dbg("Stopping acquisition.");
 753
 754                 hantek_6xxx_stop_data_collecting(sdi);
 755                 /*
 756                  * TODO: Doesn't really cancel pending transfers so they might
 757                  * come in after SR_DF_END is sent.
 758                  */
 759                 usb_source_remove(sdi->session, drvc->sr_ctx);
 760
 761                 std_session_send_df_end(sdi);
 762
 763                 devc->dev_state = IDLE;
 764
 765                 return TRUE;
 766         }
 767
 768         return TRUE;
 769 }
 770
 771 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 772 {
 773         struct dev_context *devc;
 774         struct sr_dev_driver *di = sdi->driver;
 775         struct drv_context *drvc = di->context;
 776
 777         if (sdi->status != SR_ST_ACTIVE)
 778                 return SR_ERR_DEV_CLOSED;
 779
 780         devc = sdi->priv;
 781
 782         if (configure_channels(sdi) != SR_OK) {
 783                 sr_err("Failed to configure channels.");
 784                 return SR_ERR;
 785         }
 786
 787         if (hantek_6xxx_init(sdi) != SR_OK)
 788                 return SR_ERR;
 789
 790         std_session_send_df_header(sdi);
 791
 792         devc->samp_received = 0;
 793         devc->dev_state = FLUSH;
 794
 795         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 796                        handle_event, (void *)sdi);
 797
 798         hantek_6xxx_start_data_collecting(sdi);
 799
 800         read_channel(sdi, FLUSH_PACKET_SIZE);
 801
 802         return SR_OK;
 803 }
 804
 805 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 806 {
 807         struct dev_context *devc;
 808
 809         if (sdi->status != SR_ST_ACTIVE)
 810                 return SR_ERR;
 811
 812         devc = sdi->priv;
 813         devc->dev_state = STOPPING;
 814
 815         g_free(devc->sample_buf); devc->sample_buf = NULL;
 816
 817         return SR_OK;
 818 }
 819
 820 static struct sr_dev_driver hantek_6xxx_driver_info = {
 821         .name = "hantek-6xxx",
 822         .longname = "Hantek 6xxx",
 823         .api_version = 1,
 824         .init = std_init,
 825         .cleanup = std_cleanup,
 826         .scan = scan,
 827         .dev_list = std_dev_list,
 828         .dev_clear = dev_clear,
 829         .config_get = config_get,
 830         .config_set = config_set,
 831         .config_list = config_list,
 832         .dev_open = dev_open,
 833         .dev_close = dev_close,
 834         .dev_acquisition_start = dev_acquisition_start,
 835         .dev_acquisition_stop = dev_acquisition_stop,
 836         .context = NULL,
 837 };
 838 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);