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 *coupling[] = {
  54         "AC", "DC",
  55 };
  56
  57 static const struct hantek_6xxx_profile dev_profiles[] = {
  58         {
  59                 0x04b4, 0x6022, 0x04b5, 0x6022,
  60                 "Hantek", "6022BE", "hantek-6022be.fw",
  61         },
  62         {
  63                 0x8102, 0x8102, 0x1D50, 0x608E,
  64                 "Sainsmart", "DDS120", "sainsmart-dds120.fw",
  65         },
  66         ALL_ZERO
  67 };
  68
  69 static const uint64_t samplerates[] = {
  70         SAMPLERATE_VALUES
  71 };
  72
  73 static const uint64_t vdivs[][2] = {
  74         VDIV_VALUES
  75 };
  76
  77 SR_PRIV struct sr_dev_driver hantek_6xxx_driver_info;
  78
  79 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  80
  81 static int dev_acquisition_stop(struct sr_dev_inst *sdi);
  82
  83 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  84 {
  85         struct sr_dev_inst *sdi;
  86         struct sr_channel *ch;
  87         struct sr_channel_group *cg;
  88         struct drv_context *drvc;
  89         struct dev_context *devc;
  90         unsigned int i;
  91
  92         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  93         sdi->status = SR_ST_INITIALIZING;
  94         sdi->vendor = g_strdup(prof->vendor);
  95         sdi->model = g_strdup(prof->model);
  96         sdi->driver = &hantek_6xxx_driver_info;
  97
  98         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
  99                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 100                 cg = g_malloc0(sizeof(struct sr_channel_group));
 101                 cg->name = g_strdup(channel_names[i]);
 102                 cg->channels = g_slist_append(cg->channels, ch);
 103                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 104         }
 105
 106         devc = g_malloc0(sizeof(struct dev_context));
 107
 108         for (i = 0; i < NUM_CHANNELS; i++) {
 109                 devc->ch_enabled[i] = TRUE;
 110                 devc->voltage[i] = DEFAULT_VOLTAGE;
 111                 devc->coupling[i] = DEFAULT_COUPLING;
 112         }
 113
 114         devc->sample_buf = NULL;
 115         devc->sample_buf_write = 0;
 116         devc->sample_buf_size = 0;
 117
 118         devc->profile = prof;
 119         devc->dev_state = IDLE;
 120         devc->samplerate = DEFAULT_SAMPLERATE;
 121
 122         sdi->priv = devc;
 123         drvc = sdi->driver->context;
 124         drvc->instances = g_slist_append(drvc->instances, sdi);
 125
 126         return sdi;
 127 }
 128
 129 static int configure_channels(const struct sr_dev_inst *sdi)
 130 {
 131         struct dev_context *devc;
 132         const GSList *l;
 133         int p;
 134         struct sr_channel *ch;
 135         devc = sdi->priv;
 136
 137         g_slist_free(devc->enabled_channels);
 138         devc->enabled_channels = NULL;
 139         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 140
 141         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 142                 ch = l->data;
 143                 if (p < NUM_CHANNELS) {
 144                         devc->ch_enabled[p] = ch->enabled;
 145                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 146                 }
 147         }
 148
 149         return SR_OK;
 150 }
 151
 152 static void clear_dev_context(void *priv)
 153 {
 154         struct dev_context *devc;
 155
 156         devc = priv;
 157         g_slist_free(devc->enabled_channels);
 158         g_free(devc);
 159 }
 160
 161 static int dev_clear(const struct sr_dev_driver *di)
 162 {
 163         return std_dev_clear(di, clear_dev_context);
 164 }
 165
 166 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 167 {
 168         struct drv_context *drvc;
 169         struct dev_context *devc;
 170         struct sr_dev_inst *sdi;
 171         struct sr_usb_dev_inst *usb;
 172         struct sr_config *src;
 173         const struct hantek_6xxx_profile *prof;
 174         GSList *l, *devices, *conn_devices;
 175         struct libusb_device_descriptor des;
 176         libusb_device **devlist;
 177         int i, j;
 178         const char *conn;
 179         char connection_id[64];
 180
 181         drvc = di->context;
 182
 183         devices = 0;
 184
 185         conn = NULL;
 186         for (l = options; l; l = l->next) {
 187                 src = l->data;
 188                 if (src->key == SR_CONF_CONN) {
 189                         conn = g_variant_get_string(src->data, NULL);
 190                         break;
 191                 }
 192         }
 193         if (conn)
 194                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 195         else
 196                 conn_devices = NULL;
 197
 198         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 199         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 200         for (i = 0; devlist[i]; i++) {
 201                 if (conn) {
 202                         usb = NULL;
 203                         for (l = conn_devices; l; l = l->next) {
 204                                 usb = l->data;
 205                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 206                                         && usb->address == libusb_get_device_address(devlist[i]))
 207                                         break;
 208                         }
 209                         if (!l)
 210                                 /* This device matched none of the ones that
 211                                  * matched the conn specification. */
 212                                 continue;
 213                 }
 214
 215                 libusb_get_device_descriptor(devlist[i], &des);
 216
 217                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 218
 219                 prof = NULL;
 220                 for (j = 0; j < (int)ARRAY_SIZE(dev_profiles); j++) {
 221                         if (des.idVendor == dev_profiles[j].orig_vid
 222                                 && des.idProduct == dev_profiles[j].orig_pid) {
 223                                 /* Device matches the pre-firmware profile. */
 224                                 prof = &dev_profiles[j];
 225                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 226                                 sdi = hantek_6xxx_dev_new(prof);
 227                                 sdi->connection_id = g_strdup(connection_id);
 228                                 devices = g_slist_append(devices, sdi);
 229                                 devc = sdi->priv;
 230                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 231                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 232                                         /* Remember when the firmware on this device was updated. */
 233                                         devc->fw_updated = g_get_monotonic_time();
 234                                 else
 235                                         sr_err("Firmware upload failed.");
 236                                 /* Dummy USB address of 0xff will get overwritten later. */
 237                                 sdi->conn = sr_usb_dev_inst_new(
 238                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 239                                 break;
 240                         } else if (des.idVendor == dev_profiles[j].fw_vid
 241                                 && des.idProduct == dev_profiles[j].fw_pid) {
 242                                 /* Device matches the post-firmware profile. */
 243                                 prof = &dev_profiles[j];
 244                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 245                                 sdi = hantek_6xxx_dev_new(prof);
 246                                 sdi->connection_id = g_strdup(connection_id);
 247                                 sdi->status = SR_ST_INACTIVE;
 248                                 devices = g_slist_append(devices, sdi);
 249                                 sdi->inst_type = SR_INST_USB;
 250                                 sdi->conn = sr_usb_dev_inst_new(
 251                                                 libusb_get_bus_number(devlist[i]),
 252                                                 libusb_get_device_address(devlist[i]), NULL);
 253                                 break;
 254                         }
 255                 }
 256                 if (!prof)
 257                         /* Not a supported VID/PID. */
 258                         continue;
 259         }
 260         libusb_free_device_list(devlist, 1);
 261
 262         return devices;
 263 }
 264
 265 static int dev_open(struct sr_dev_inst *sdi)
 266 {
 267         struct dev_context *devc;
 268         struct sr_usb_dev_inst *usb;
 269         int64_t timediff_us, timediff_ms;
 270         int err;
 271
 272         devc = sdi->priv;
 273         usb = sdi->conn;
 274
 275         /*
 276          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 277          * for the FX2 to renumerate.
 278          */
 279         err = SR_ERR;
 280         if (devc->fw_updated > 0) {
 281                 sr_info("Waiting for device to reset.");
 282                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 283                 g_usleep(300 * 1000);
 284                 timediff_ms = 0;
 285                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 286                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 287                                 break;
 288                         g_usleep(100 * 1000);
 289                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 290                         timediff_ms = timediff_us / 1000;
 291                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 292                 }
 293                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 294                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 295         } else {
 296                 err = hantek_6xxx_open(sdi);
 297         }
 298
 299         if (err != SR_OK) {
 300                 sr_err("Unable to open device.");
 301                 return SR_ERR;
 302         }
 303
 304         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 305         if (err != 0) {
 306                 sr_err("Unable to claim interface: %s.",
 307                            libusb_error_name(err));
 308                 return SR_ERR;
 309         }
 310
 311         return SR_OK;
 312 }
 313
 314 static int dev_close(struct sr_dev_inst *sdi)
 315 {
 316         hantek_6xxx_close(sdi);
 317
 318         return SR_OK;
 319 }
 320
 321 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 322                 const struct sr_channel_group *cg)
 323 {
 324         struct dev_context *devc;
 325         struct sr_usb_dev_inst *usb;
 326         char str[128];
 327         const uint64_t *vdiv;
 328         int ch_idx;
 329
 330         switch (key) {
 331         case SR_CONF_NUM_VDIV:
 332                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 333                 break;
 334         }
 335
 336         if (!sdi)
 337                 return SR_ERR_ARG;
 338
 339         devc = sdi->priv;
 340         if (!cg) {
 341                 switch (key) {
 342                 case SR_CONF_SAMPLERATE:
 343                         *data = g_variant_new_uint64(devc->samplerate);
 344                         break;
 345                 case SR_CONF_LIMIT_MSEC:
 346                         *data = g_variant_new_uint64(devc->limit_msec);
 347                         break;
 348                 case SR_CONF_LIMIT_SAMPLES:
 349                         *data = g_variant_new_uint64(devc->limit_samples);
 350                         break;
 351                 case SR_CONF_CONN:
 352                         if (!sdi->conn)
 353                                 return SR_ERR_ARG;
 354                         usb = sdi->conn;
 355                         if (usb->address == 255)
 356                                 /* Device still needs to re-enumerate after firmware
 357                                  * upload, so we don't know its (future) address. */
 358                                 return SR_ERR;
 359                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 360                         *data = g_variant_new_string(str);
 361                         break;
 362                 default:
 363                         return SR_ERR_NA;
 364                 }
 365         } else {
 366                 if (sdi->channel_groups->data == cg)
 367                         ch_idx = 0;
 368                 else if (sdi->channel_groups->next->data == cg)
 369                         ch_idx = 1;
 370                 else
 371                         return SR_ERR_ARG;
 372                 switch (key) {
 373                 case SR_CONF_VDIV:
 374                         vdiv = vdivs[devc->voltage[ch_idx]];
 375                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 376                         break;
 377                 case SR_CONF_COUPLING:
 378                         *data = g_variant_new_string(coupling[devc->coupling[ch_idx]]);
 379                         break;
 380                 }
 381         }
 382
 383         return SR_OK;
 384 }
 385
 386 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 387                 const struct sr_channel_group *cg)
 388 {
 389         struct dev_context *devc;
 390         uint64_t p, q;
 391         int tmp_int, ch_idx, ret;
 392         unsigned int i;
 393         const char *tmp_str;
 394
 395         if (sdi->status != SR_ST_ACTIVE)
 396                 return SR_ERR_DEV_CLOSED;
 397
 398         ret = SR_OK;
 399         devc = sdi->priv;
 400         if (!cg) {
 401                 switch (key) {
 402                 case SR_CONF_SAMPLERATE:
 403                         devc->samplerate = g_variant_get_uint64(data);
 404                         hantek_6xxx_update_samplerate(sdi);
 405                         break;
 406                 case SR_CONF_LIMIT_MSEC:
 407                         devc->limit_msec = g_variant_get_uint64(data);
 408                         break;
 409                 case SR_CONF_LIMIT_SAMPLES:
 410                         devc->limit_samples = g_variant_get_uint64(data);
 411                         break;
 412                 default:
 413                         ret = SR_ERR_NA;
 414                         break;
 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                         g_variant_get(data, "(tt)", &p, &q);
 426                         tmp_int = -1;
 427                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 428                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 429                                         tmp_int = i;
 430                                         break;
 431                                 }
 432                         }
 433                         if (tmp_int >= 0) {
 434                                 devc->voltage[ch_idx] = tmp_int;
 435                                 hantek_6xxx_update_vdiv(sdi);
 436                         } else
 437                                 ret = SR_ERR_ARG;
 438                         break;
 439                 case SR_CONF_COUPLING:
 440                         tmp_str = g_variant_get_string(data, NULL);
 441                         for (i = 0; coupling[i]; i++) {
 442                                 if (!strcmp(tmp_str, coupling[i])) {
 443                                         devc->coupling[ch_idx] = i;
 444                                         break;
 445                                 }
 446                         }
 447                         if (coupling[i] == 0)
 448                                 ret = SR_ERR_ARG;
 449                         break;
 450                 default:
 451                         ret = SR_ERR_NA;
 452                         break;
 453                 }
 454         }
 455
 456         return ret;
 457 }
 458
 459 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 460                 const struct sr_channel_group *cg)
 461 {
 462         GVariant *tuple, *rational[2];
 463         GVariantBuilder gvb;
 464         unsigned int i;
 465         GVariant *gvar;
 466
 467         if (key == SR_CONF_SCAN_OPTIONS) {
 468                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 469                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 470                 return SR_OK;
 471         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 472                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 473                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 474                 return SR_OK;
 475         }
 476
 477         if (!sdi)
 478                 return SR_ERR_ARG;
 479
 480         if (!cg) {
 481                 switch (key) {
 482                 case SR_CONF_DEVICE_OPTIONS:
 483                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 484                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 485                         break;
 486                 case SR_CONF_SAMPLERATE:
 487                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 488                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 489                                 samplerates, ARRAY_SIZE(samplerates),
 490                                 sizeof(uint64_t));
 491                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 492                         *data = g_variant_builder_end(&gvb);
 493                         break;
 494                 default:
 495                         return SR_ERR_NA;
 496                 }
 497         } else {
 498                 switch (key) {
 499                 case SR_CONF_DEVICE_OPTIONS:
 500                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 501                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 502                         break;
 503                 case SR_CONF_COUPLING:
 504                         *data = g_variant_new_strv(coupling, ARRAY_SIZE(coupling));
 505                         break;
 506                 case SR_CONF_VDIV:
 507                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 508                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 509                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 510                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 511                                 tuple = g_variant_new_tuple(rational, 2);
 512                                 g_variant_builder_add_value(&gvb, tuple);
 513                         }
 514                         *data = g_variant_builder_end(&gvb);
 515                         break;
 516                 default:
 517                         return SR_ERR_NA;
 518                 }
 519         }
 520
 521         return SR_OK;
 522 }
 523
 524 /* Minimise data amount for limit_samples and limit_msec limits. */
 525 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 526 {
 527         struct dev_context *devc = sdi->priv;
 528         uint32_t data_left;
 529         int32_t time_left;
 530
 531         if (devc->limit_msec) {
 532                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 533                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 534         } else if (devc->limit_samples) {
 535                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 536         } else {
 537                 data_left = devc->samplerate * NUM_CHANNELS;
 538         }
 539
 540         data_left += MIN_PACKET_SIZE; /* Driver does not handle small buffers. */
 541
 542         sr_spew("data_amount %u", data_left);
 543
 544         return data_left;
 545 }
 546
 547 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 548                 int num_samples)
 549 {
 550         struct sr_datafeed_packet packet;
 551         struct sr_datafeed_analog_old analog;
 552         struct dev_context *devc = sdi->priv;
 553         int num_channels, data_offset, i;
 554
 555         const float ch1_bit = RANGE(0) / 255;
 556         const float ch2_bit = RANGE(1) / 255;
 557         const float ch1_center = RANGE(0) / 2;
 558         const float ch2_center = RANGE(1) / 2;
 559
 560         const gboolean ch1_ena = !!devc->ch_enabled[0];
 561         const gboolean ch2_ena = !!devc->ch_enabled[1];
 562
 563         num_channels = (ch1_ena && ch2_ena) ? 2 : 1;
 564         packet.type = SR_DF_ANALOG_OLD;
 565         packet.payload = &analog;
 566
 567         analog.channels = devc->enabled_channels;
 568         analog.num_samples = num_samples;
 569         analog.mq = SR_MQ_VOLTAGE;
 570         analog.unit = SR_UNIT_VOLT;
 571         analog.mqflags = 0;
 572
 573         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_channels);
 574         if (!analog.data) {
 575                 sr_err("Analog data buffer malloc failed.");
 576                 devc->dev_state = STOPPING;
 577                 return;
 578         }
 579
 580         data_offset = 0;
 581         for (i = 0; i < num_samples; i++) {
 582                 /*
 583                  * The device always sends data for both channels. If a channel
 584                  * is disabled, it contains a copy of the enabled channel's
 585                  * data. However, we only send the requested channels to
 586                  * the bus.
 587                  *
 588                  * Voltage values are encoded as a value 0-255, where the
 589                  * value is a point in the range represented by the vdiv
 590                  * setting. There are 10 vertical divs, so e.g. 500mV/div
 591                  * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 592                  */
 593                 if (ch1_ena)
 594                         analog.data[data_offset++] = (ch1_bit * *(buf + i * 2) - ch1_center);
 595                 if (ch2_ena)
 596                         analog.data[data_offset++] = (ch2_bit * *(buf + i * 2 + 1) - ch2_center);
 597         }
 598
 599         sr_session_send(sdi, &packet);
 600         g_free(analog.data);
 601 }
 602
 603 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 604 {
 605         int i = 0;
 606         uint64_t send = 0;
 607         uint32_t chunk;
 608
 609         while (send < samples) {
 610                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 611                 send += chunk;
 612                 send_chunk(sdi, buf[i]->buffer, chunk);
 613
 614                 /*
 615                  * Everything in this transfer was either copied to the buffer
 616                  * or sent to the session bus.
 617                  */
 618                 g_free(buf[i]->buffer);
 619                 libusb_free_transfer(buf[i]);
 620                 i++;
 621         }
 622 }
 623
 624 /*
 625  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 626  * Only channel data comes in asynchronously, and all transfers for this are
 627  * queued up beforehand, so this just needs to chuck the incoming data onto
 628  * the libsigrok session bus.
 629  */
 630 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 631 {
 632         struct sr_dev_inst *sdi;
 633         struct dev_context *devc;
 634
 635         sdi = transfer->user_data;
 636         devc = sdi->priv;
 637
 638         if (devc->dev_state == FLUSH) {
 639                 g_free(transfer->buffer);
 640                 libusb_free_transfer(transfer);
 641                 devc->dev_state = CAPTURE;
 642                 devc->aq_started = g_get_monotonic_time();
 643                 read_channel(sdi, data_amount(sdi));
 644                 return;
 645         }
 646
 647         if (devc->dev_state != CAPTURE)
 648                 return;
 649
 650         if (!devc->sample_buf) {
 651                 devc->sample_buf_size = 10;
 652                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 653                 devc->sample_buf_write = 0;
 654         }
 655
 656         if (devc->sample_buf_write >= devc->sample_buf_size) {
 657                 devc->sample_buf_size += 10;
 658                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 659                                 devc->sample_buf_size * sizeof(transfer));
 660                 if (!devc->sample_buf) {
 661                         sr_err("Sample buffer malloc failed.");
 662                         devc->dev_state = STOPPING;
 663                         return;
 664                 }
 665         }
 666
 667         devc->sample_buf[devc->sample_buf_write++] = transfer;
 668         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 669
 670         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 671                 (uint64_t)(transfer->actual_length * 1000 /
 672                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 673                 NUM_CHANNELS));
 674
 675         sr_spew("receive_transfer(): status %s received %d bytes.",
 676                 libusb_error_name(transfer->status), transfer->actual_length);
 677
 678         if (transfer->actual_length == 0)
 679                 /* Nothing to send to the bus. */
 680                 return;
 681
 682         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 683                 sr_info("Requested number of samples reached, stopping. %"
 684                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 685                         devc->samp_received);
 686                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 687                 sdi->driver->dev_acquisition_stop(sdi);
 688         } else if (devc->limit_msec && (g_get_monotonic_time() -
 689                         devc->aq_started) / 1000 >= devc->limit_msec) {
 690                 sr_info("Requested time limit reached, stopping. %d <= %d",
 691                         (uint32_t)devc->limit_msec,
 692                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 693                 send_data(sdi, devc->sample_buf, devc->samp_received);
 694                 g_free(devc->sample_buf);
 695                 devc->sample_buf = NULL;
 696                 sdi->driver->dev_acquisition_stop(sdi);
 697         } else {
 698                 read_channel(sdi, data_amount(sdi));
 699         }
 700 }
 701
 702 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 703 {
 704         int ret;
 705         struct dev_context *devc;
 706
 707         devc = sdi->priv;
 708
 709         amount = MIN(amount, MAX_PACKET_SIZE);
 710         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 711         devc->read_start_ts = g_get_monotonic_time();
 712         devc->read_data_amount = amount;
 713
 714         return ret;
 715 }
 716
 717 static int handle_event(int fd, int revents, void *cb_data)
 718 {
 719         const struct sr_dev_inst *sdi;
 720         struct timeval tv;
 721         struct sr_dev_driver *di;
 722         struct dev_context *devc;
 723         struct drv_context *drvc;
 724
 725         (void)fd;
 726         (void)revents;
 727
 728         sdi = cb_data;
 729         di = sdi->driver;
 730         drvc = di->context;
 731         devc = sdi->priv;
 732
 733         /* Always handle pending libusb events. */
 734         tv.tv_sec = tv.tv_usec = 0;
 735         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 736
 737         if (devc->dev_state == STOPPING) {
 738                 /* We've been told to wind up the acquisition. */
 739                 sr_dbg("Stopping acquisition.");
 740
 741                 hantek_6xxx_stop_data_collecting(sdi);
 742                 /*
 743                  * TODO: Doesn't really cancel pending transfers so they might
 744                  * come in after SR_DF_END is sent.
 745                  */
 746                 usb_source_remove(sdi->session, drvc->sr_ctx);
 747
 748                 std_session_send_df_end(sdi, LOG_PREFIX);
 749
 750                 devc->dev_state = IDLE;
 751
 752                 return TRUE;
 753         }
 754
 755         return TRUE;
 756 }
 757
 758 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 759 {
 760         struct dev_context *devc;
 761         struct sr_dev_driver *di = sdi->driver;
 762         struct drv_context *drvc = di->context;
 763
 764         if (sdi->status != SR_ST_ACTIVE)
 765                 return SR_ERR_DEV_CLOSED;
 766
 767         devc = sdi->priv;
 768
 769         if (configure_channels(sdi) != SR_OK) {
 770                 sr_err("Failed to configure channels.");
 771                 return SR_ERR;
 772         }
 773
 774         if (hantek_6xxx_init(sdi) != SR_OK)
 775                 return SR_ERR;
 776
 777         std_session_send_df_header(sdi, LOG_PREFIX);
 778
 779         devc->samp_received = 0;
 780         devc->dev_state = FLUSH;
 781
 782         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 783                        handle_event, (void *)sdi);
 784
 785         hantek_6xxx_start_data_collecting(sdi);
 786
 787         read_channel(sdi, FLUSH_PACKET_SIZE);
 788
 789         return SR_OK;
 790 }
 791
 792 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 793 {
 794         struct dev_context *devc;
 795
 796         if (sdi->status != SR_ST_ACTIVE)
 797                 return SR_ERR;
 798
 799         devc = sdi->priv;
 800         devc->dev_state = STOPPING;
 801
 802         g_free(devc->sample_buf); devc->sample_buf = NULL;
 803
 804         return SR_OK;
 805 }
 806
 807 SR_PRIV struct sr_dev_driver hantek_6xxx_driver_info = {
 808         .name = "hantek-6xxx",
 809         .longname = "Hantek 6xxx",
 810         .api_version = 1,
 811         .init = std_init,
 812         .cleanup = std_cleanup,
 813         .scan = scan,
 814         .dev_list = std_dev_list,
 815         .dev_clear = dev_clear,
 816         .config_get = config_get,
 817         .config_set = config_set,
 818         .config_list = config_list,
 819         .dev_open = dev_open,
 820         .dev_close = dev_close,
 821         .dev_acquisition_start = dev_acquisition_start,
 822         .dev_acquisition_stop = dev_acquisition_stop,
 823         .context = NULL,
 824 };