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 };
  47
  48 static const char *channel_names[] = {
  49         "CH1", "CH2",
  50 };
  51
  52 static const struct hantek_6xxx_profile dev_profiles[] = {
  53         {
  54                 0x04b4, 0x6022, 0x04b5, 0x6022,
  55                 "Hantek", "6022BE", "hantek-6022be.fw",
  56         },
  57         {
  58                 0x8102, 0x8102, 0x04b5, 0x6022,
  59                 "Sainsmart", "DDS120", "sainsmart-dds120.fw",
  60         },
  61         ALL_ZERO
  62 };
  63
  64 static const uint64_t samplerates[] = {
  65         SAMPLERATE_VALUES
  66 };
  67
  68 static const uint64_t vdivs[][2] = {
  69         VDIV_VALUES
  70 };
  71
  72 SR_PRIV struct sr_dev_driver hantek_6xxx_driver_info;
  73
  74 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
  75
  76 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
  77
  78 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
  79 {
  80         struct sr_dev_inst *sdi;
  81         struct sr_channel *ch;
  82         struct sr_channel_group *cg;
  83         struct drv_context *drvc;
  84         struct dev_context *devc;
  85         unsigned int i;
  86
  87         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  88         sdi->status = SR_ST_INITIALIZING;
  89         sdi->vendor = g_strdup(prof->vendor);
  90         sdi->model = g_strdup(prof->model);
  91         sdi->driver = &hantek_6xxx_driver_info;
  92
  93         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
  94                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
  95                 cg = g_malloc0(sizeof(struct sr_channel_group));
  96                 cg->name = g_strdup(channel_names[i]);
  97                 cg->channels = g_slist_append(cg->channels, ch);
  98                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
  99         }
 100
 101         devc = g_malloc0(sizeof(struct dev_context));
 102
 103         for (i = 0; i < NUM_CHANNELS; i++) {
 104                 devc->ch_enabled[i] = TRUE;
 105                 devc->voltage[i] = DEFAULT_VOLTAGE;
 106         }
 107
 108         devc->sample_buf = NULL;
 109         devc->sample_buf_write = 0;
 110         devc->sample_buf_size = 0;
 111
 112         devc->profile = prof;
 113         devc->dev_state = IDLE;
 114         devc->samplerate = DEFAULT_SAMPLERATE;
 115
 116         sdi->priv = devc;
 117         drvc = sdi->driver->context;
 118         drvc->instances = g_slist_append(drvc->instances, sdi);
 119
 120         return sdi;
 121 }
 122
 123 static int configure_channels(const struct sr_dev_inst *sdi)
 124 {
 125         struct dev_context *devc;
 126         const GSList *l;
 127         int p;
 128         struct sr_channel *ch;
 129         devc = sdi->priv;
 130
 131         g_slist_free(devc->enabled_channels);
 132         devc->enabled_channels = NULL;
 133         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 134
 135         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 136                 ch = l->data;
 137                 if (p < NUM_CHANNELS) {
 138                         devc->ch_enabled[p] = ch->enabled;
 139                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 140                 }
 141         }
 142
 143         return SR_OK;
 144 }
 145
 146 static void clear_dev_context(void *priv)
 147 {
 148         struct dev_context *devc;
 149
 150         devc = priv;
 151         g_slist_free(devc->enabled_channels);
 152 }
 153
 154 static int dev_clear(const struct sr_dev_driver *di)
 155 {
 156         return std_dev_clear(di, clear_dev_context);
 157 }
 158
 159 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
 160 {
 161         return std_init(sr_ctx, di, LOG_PREFIX);
 162 }
 163
 164 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 165 {
 166         struct drv_context *drvc;
 167         struct dev_context *devc;
 168         struct sr_dev_inst *sdi;
 169         struct sr_usb_dev_inst *usb;
 170         struct sr_config *src;
 171         const struct hantek_6xxx_profile *prof;
 172         GSList *l, *devices, *conn_devices;
 173         struct libusb_device_descriptor des;
 174         libusb_device **devlist;
 175         int i, j;
 176         const char *conn;
 177         char connection_id[64];
 178
 179         drvc = di->context;
 180
 181         devices = 0;
 182
 183         conn = NULL;
 184         for (l = options; l; l = l->next) {
 185                 src = l->data;
 186                 if (src->key == SR_CONF_CONN) {
 187                         conn = g_variant_get_string(src->data, NULL);
 188                         break;
 189                 }
 190         }
 191         if (conn)
 192                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 193         else
 194                 conn_devices = NULL;
 195
 196         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 197         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 198         for (i = 0; devlist[i]; i++) {
 199                 if (conn) {
 200                         usb = NULL;
 201                         for (l = conn_devices; l; l = l->next) {
 202                                 usb = l->data;
 203                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 204                                         && usb->address == libusb_get_device_address(devlist[i]))
 205                                         break;
 206                         }
 207                         if (!l)
 208                                 /* This device matched none of the ones that
 209                                  * matched the conn specification. */
 210                                 continue;
 211                 }
 212
 213                 libusb_get_device_descriptor(devlist[i], &des);
 214
 215                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 216
 217                 prof = NULL;
 218                 for (j = 0; j < (int)ARRAY_SIZE(dev_profiles); j++) {
 219                         if (des.idVendor == dev_profiles[j].orig_vid
 220                                 && des.idProduct == dev_profiles[j].orig_pid) {
 221                                 /* Device matches the pre-firmware profile. */
 222                                 prof = &dev_profiles[j];
 223                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 224                                 sdi = hantek_6xxx_dev_new(prof);
 225                                 sdi->connection_id = g_strdup(connection_id);
 226                                 devices = g_slist_append(devices, sdi);
 227                                 devc = sdi->priv;
 228                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 229                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 230                                         /* Remember when the firmware on this device was updated. */
 231                                         devc->fw_updated = g_get_monotonic_time();
 232                                 else
 233                                         sr_err("Firmware upload failed.");
 234                                 /* Dummy USB address of 0xff will get overwritten later. */
 235                                 sdi->conn = sr_usb_dev_inst_new(
 236                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 237                                 break;
 238                         } else if (des.idVendor == dev_profiles[j].fw_vid
 239                                 && des.idProduct == dev_profiles[j].fw_pid) {
 240                                 /* Device matches the post-firmware profile. */
 241                                 prof = &dev_profiles[j];
 242                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 243                                 sdi = hantek_6xxx_dev_new(prof);
 244                                 sdi->connection_id = g_strdup(connection_id);
 245                                 sdi->status = SR_ST_INACTIVE;
 246                                 devices = g_slist_append(devices, sdi);
 247                                 sdi->inst_type = SR_INST_USB;
 248                                 sdi->conn = sr_usb_dev_inst_new(
 249                                                 libusb_get_bus_number(devlist[i]),
 250                                                 libusb_get_device_address(devlist[i]), NULL);
 251                                 break;
 252                         }
 253                 }
 254                 if (!prof)
 255                         /* Not a supported VID/PID. */
 256                         continue;
 257         }
 258         libusb_free_device_list(devlist, 1);
 259
 260         return devices;
 261 }
 262
 263 static GSList *dev_list(const struct sr_dev_driver *di)
 264 {
 265         return ((struct drv_context *)(di->context))->instances;
 266 }
 267
 268 static int dev_open(struct sr_dev_inst *sdi)
 269 {
 270         struct dev_context *devc;
 271         struct sr_usb_dev_inst *usb;
 272         int64_t timediff_us, timediff_ms;
 273         int err;
 274
 275         devc = sdi->priv;
 276         usb = sdi->conn;
 277
 278         /*
 279          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 280          * for the FX2 to renumerate.
 281          */
 282         err = SR_ERR;
 283         if (devc->fw_updated > 0) {
 284                 sr_info("Waiting for device to reset.");
 285                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 286                 g_usleep(300 * 1000);
 287                 timediff_ms = 0;
 288                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 289                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 290                                 break;
 291                         g_usleep(100 * 1000);
 292                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 293                         timediff_ms = timediff_us / 1000;
 294                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 295                 }
 296                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 297                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 298         } else {
 299                 err = hantek_6xxx_open(sdi);
 300         }
 301
 302         if (err != SR_OK) {
 303                 sr_err("Unable to open device.");
 304                 return SR_ERR;
 305         }
 306
 307         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 308         if (err != 0) {
 309                 sr_err("Unable to claim interface: %s.",
 310                            libusb_error_name(err));
 311                 return SR_ERR;
 312         }
 313
 314         return SR_OK;
 315 }
 316
 317 static int dev_close(struct sr_dev_inst *sdi)
 318 {
 319         hantek_6xxx_close(sdi);
 320
 321         return SR_OK;
 322 }
 323
 324 static int cleanup(const struct sr_dev_driver *di)
 325 {
 326         return dev_clear(di);
 327 }
 328
 329 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 330                 const struct sr_channel_group *cg)
 331 {
 332         struct dev_context *devc;
 333         struct sr_usb_dev_inst *usb;
 334         char str[128];
 335         const uint64_t *vdiv;
 336         int ch_idx;
 337
 338         switch (key) {
 339         case SR_CONF_NUM_VDIV:
 340                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 341                 break;
 342         }
 343
 344         if (!sdi)
 345                 return SR_ERR_ARG;
 346
 347         devc = sdi->priv;
 348         if (!cg) {
 349                 switch (key) {
 350                 case SR_CONF_SAMPLERATE:
 351                         *data = g_variant_new_uint64(devc->samplerate);
 352                         break;
 353                 case SR_CONF_LIMIT_MSEC:
 354                         *data = g_variant_new_uint64(devc->limit_msec);
 355                         break;
 356                 case SR_CONF_LIMIT_SAMPLES:
 357                         *data = g_variant_new_uint64(devc->limit_samples);
 358                         break;
 359                 case SR_CONF_CONN:
 360                         if (!sdi->conn)
 361                                 return SR_ERR_ARG;
 362                         usb = sdi->conn;
 363                         if (usb->address == 255)
 364                                 /* Device still needs to re-enumerate after firmware
 365                                  * upload, so we don't know its (future) address. */
 366                                 return SR_ERR;
 367                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 368                         *data = g_variant_new_string(str);
 369                         break;
 370                 default:
 371                         return SR_ERR_NA;
 372                 }
 373         } else {
 374                 if (sdi->channel_groups->data == cg)
 375                         ch_idx = 0;
 376                 else if (sdi->channel_groups->next->data == cg)
 377                         ch_idx = 1;
 378                 else
 379                         return SR_ERR_ARG;
 380                 switch (key) {
 381                 case SR_CONF_VDIV:
 382                         vdiv = vdivs[devc->voltage[ch_idx]];
 383                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 384                         break;
 385                 }
 386         }
 387
 388         return SR_OK;
 389 }
 390
 391 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 392                 const struct sr_channel_group *cg)
 393 {
 394         struct dev_context *devc;
 395         uint64_t p, q;
 396         int tmp_int, ch_idx, ret;
 397         unsigned int i;
 398
 399         if (sdi->status != SR_ST_ACTIVE)
 400                 return SR_ERR_DEV_CLOSED;
 401
 402         ret = SR_OK;
 403         devc = sdi->priv;
 404         if (!cg) {
 405                 switch (key) {
 406                 case SR_CONF_SAMPLERATE:
 407                         devc->samplerate = g_variant_get_uint64(data);
 408                         hantek_6xxx_update_samplerate(sdi);
 409                         break;
 410                 case SR_CONF_LIMIT_MSEC:
 411                         devc->limit_msec = g_variant_get_uint64(data);
 412                         break;
 413                 case SR_CONF_LIMIT_SAMPLES:
 414                         devc->limit_samples = g_variant_get_uint64(data);
 415                         break;
 416                 default:
 417                         ret = SR_ERR_NA;
 418                         break;
 419                 }
 420         } else {
 421                 if (sdi->channel_groups->data == cg)
 422                         ch_idx = 0;
 423                 else if (sdi->channel_groups->next->data == cg)
 424                         ch_idx = 1;
 425                 else
 426                         return SR_ERR_ARG;
 427                 switch (key) {
 428                 case SR_CONF_VDIV:
 429                         g_variant_get(data, "(tt)", &p, &q);
 430                         tmp_int = -1;
 431                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 432                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 433                                         tmp_int = i;
 434                                         break;
 435                                 }
 436                         }
 437                         if (tmp_int >= 0) {
 438                                 devc->voltage[ch_idx] = tmp_int;
 439                                 hantek_6xxx_update_vdiv(sdi);
 440                         } else
 441                                 ret = SR_ERR_ARG;
 442                         break;
 443                 default:
 444                         ret = SR_ERR_NA;
 445                         break;
 446                 }
 447         }
 448
 449         return ret;
 450 }
 451
 452 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 453                 const struct sr_channel_group *cg)
 454 {
 455         GVariant *tuple, *rational[2];
 456         GVariantBuilder gvb;
 457         unsigned int i;
 458         GVariant *gvar;
 459
 460         if (key == SR_CONF_SCAN_OPTIONS) {
 461                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 462                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 463                 return SR_OK;
 464         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 465                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 466                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 467                 return SR_OK;
 468         }
 469
 470         if (!sdi)
 471                 return SR_ERR_ARG;
 472
 473         if (!cg) {
 474                 switch (key) {
 475                 case SR_CONF_DEVICE_OPTIONS:
 476                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 477                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 478                         break;
 479                 case SR_CONF_SAMPLERATE:
 480                         g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 481                         gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 482                                 samplerates, ARRAY_SIZE(samplerates),
 483                                 sizeof(uint64_t));
 484                         g_variant_builder_add(&gvb, "{sv}", "samplerates", gvar);
 485                         *data = g_variant_builder_end(&gvb);
 486                         break;
 487                 default:
 488                         return SR_ERR_NA;
 489                 }
 490         } else {
 491                 switch (key) {
 492                 case SR_CONF_DEVICE_OPTIONS:
 493                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 494                                 devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
 495                         break;
 496                 case SR_CONF_VDIV:
 497                         g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 498                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 499                                 rational[0] = g_variant_new_uint64(vdivs[i][0]);
 500                                 rational[1] = g_variant_new_uint64(vdivs[i][1]);
 501                                 tuple = g_variant_new_tuple(rational, 2);
 502                                 g_variant_builder_add_value(&gvb, tuple);
 503                         }
 504                         *data = g_variant_builder_end(&gvb);
 505                         break;
 506                 default:
 507                         return SR_ERR_NA;
 508                 }
 509         }
 510
 511         return SR_OK;
 512 }
 513
 514 /* Minimise data amount for limit_samples and limit_msec limits. */
 515 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 516 {
 517         struct dev_context *devc = sdi->priv;
 518         uint32_t data_left;
 519         int32_t time_left;
 520
 521         if (devc->limit_msec) {
 522                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 523                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 524         } else if (devc->limit_samples) {
 525                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 526         } else {
 527                 data_left = devc->samplerate * NUM_CHANNELS;
 528         }
 529
 530         data_left += MIN_PACKET_SIZE; /* Driver does not handle small buffers. */
 531
 532         sr_spew("data_amount %u", data_left);
 533
 534         return data_left;
 535 }
 536
 537 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 538                 int num_samples)
 539 {
 540         struct sr_datafeed_packet packet;
 541         struct sr_datafeed_analog_old analog;
 542         struct dev_context *devc = sdi->priv;
 543         int num_channels, data_offset, i;
 544
 545         const float ch1_bit = RANGE(0) / 255;
 546         const float ch2_bit = RANGE(1) / 255;
 547         const float ch1_center = RANGE(0) / 2;
 548         const float ch2_center = RANGE(1) / 2;
 549
 550         const gboolean ch1_ena = !!devc->ch_enabled[0];
 551         const gboolean ch2_ena = !!devc->ch_enabled[1];
 552
 553         num_channels = (ch1_ena && ch2_ena) ? 2 : 1;
 554         packet.type = SR_DF_ANALOG_OLD;
 555         packet.payload = &analog;
 556
 557         analog.channels = devc->enabled_channels;
 558         analog.num_samples = num_samples;
 559         analog.mq = SR_MQ_VOLTAGE;
 560         analog.unit = SR_UNIT_VOLT;
 561         analog.mqflags = 0;
 562
 563         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_channels);
 564         if (!analog.data) {
 565                 sr_err("Analog data buffer malloc failed.");
 566                 devc->dev_state = STOPPING;
 567                 return;
 568         }
 569
 570         data_offset = 0;
 571         for (i = 0; i < num_samples; i++) {
 572                 /*
 573                  * The device always sends data for both channels. If a channel
 574                  * is disabled, it contains a copy of the enabled channel's
 575                  * data. However, we only send the requested channels to
 576                  * the bus.
 577                  *
 578                  * Voltage values are encoded as a value 0-255, where the
 579                  * value is a point in the range represented by the vdiv
 580                  * setting. There are 10 vertical divs, so e.g. 500mV/div
 581                  * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 582                  */
 583                 if (ch1_ena)
 584                         analog.data[data_offset++] = (ch1_bit * *(buf + i * 2) - ch1_center);
 585                 if (ch2_ena)
 586                         analog.data[data_offset++] = (ch2_bit * *(buf + i * 2 + 1) - ch2_center);
 587         }
 588
 589         sr_session_send(devc->cb_data, &packet);
 590         g_free(analog.data);
 591 }
 592
 593 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 594 {
 595         int i = 0;
 596         uint64_t send = 0;
 597         uint32_t chunk;
 598
 599         while (send < samples) {
 600                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 601                 send += chunk;
 602                 send_chunk(sdi, buf[i]->buffer, chunk);
 603
 604                 /*
 605                  * Everything in this transfer was either copied to the buffer
 606                  * or sent to the session bus.
 607                  */
 608                 g_free(buf[i]->buffer);
 609                 libusb_free_transfer(buf[i]);
 610                 i++;
 611         }
 612 }
 613
 614 /*
 615  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 616  * Only channel data comes in asynchronously, and all transfers for this are
 617  * queued up beforehand, so this just needs to chuck the incoming data onto
 618  * the libsigrok session bus.
 619  */
 620 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 621 {
 622         struct sr_dev_inst *sdi;
 623         struct dev_context *devc;
 624
 625         sdi = transfer->user_data;
 626         devc = sdi->priv;
 627
 628         if (devc->dev_state == FLUSH) {
 629                 devc->dev_state = CAPTURE;
 630                 devc->aq_started = g_get_monotonic_time();
 631                 read_channel(sdi, data_amount(sdi));
 632                 return;
 633         }
 634
 635         if (devc->dev_state != CAPTURE)
 636                 return;
 637
 638         if (!devc->sample_buf) {
 639                 devc->sample_buf_size = 10;
 640                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 641                 devc->sample_buf_write = 0;
 642         }
 643
 644         if (devc->sample_buf_write >= devc->sample_buf_size) {
 645                 devc->sample_buf_size += 10;
 646                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 647                                 devc->sample_buf_size * sizeof(transfer));
 648                 if (!devc->sample_buf) {
 649                         sr_err("Sample buffer malloc failed.");
 650                         devc->dev_state = STOPPING;
 651                         return;
 652                 }
 653         }
 654
 655         devc->sample_buf[devc->sample_buf_write++] = transfer;
 656         devc->samp_received = transfer->actual_length / NUM_CHANNELS;
 657
 658         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 659                 (uint64_t)(transfer->actual_length * 1000 /
 660                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 661                 NUM_CHANNELS));
 662
 663         sr_spew("receive_transfer(): status %s received %d bytes.",
 664                 libusb_error_name(transfer->status), transfer->actual_length);
 665
 666         if (transfer->actual_length == 0)
 667                 /* Nothing to send to the bus. */
 668                 return;
 669
 670         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 671                 sr_info("Requested number of samples reached, stopping. %"
 672                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 673                         devc->samp_received);
 674                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 675                 sdi->driver->dev_acquisition_stop(sdi, NULL);
 676         } else if (devc->limit_msec && (g_get_monotonic_time() -
 677                         devc->aq_started) / 1000 >= devc->limit_msec) {
 678                 sr_info("Requested time limit reached, stopping. %d <= %d",
 679                         (uint32_t)devc->limit_msec,
 680                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 681                 send_data(sdi, devc->sample_buf, devc->samp_received);
 682                 g_free(devc->sample_buf);
 683                 devc->sample_buf = NULL;
 684                 sdi->driver->dev_acquisition_stop(sdi, NULL);
 685         } else {
 686                 read_channel(sdi, data_amount(sdi));
 687         }
 688 }
 689
 690 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 691 {
 692         int ret;
 693         struct dev_context *devc;
 694
 695         devc = sdi->priv;
 696
 697         amount = MIN(amount, MAX_PACKET_SIZE);
 698         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 699         devc->read_start_ts = g_get_monotonic_time();
 700         devc->read_data_amount = amount;
 701
 702         return ret;
 703 }
 704
 705 static int handle_event(int fd, int revents, void *cb_data)
 706 {
 707         const struct sr_dev_inst *sdi;
 708         struct sr_datafeed_packet packet;
 709         struct timeval tv;
 710         struct sr_dev_driver *di;
 711         struct dev_context *devc;
 712         struct drv_context *drvc;
 713
 714         (void)fd;
 715         (void)revents;
 716
 717         sdi = cb_data;
 718         di = sdi->driver;
 719         drvc = di->context;
 720         devc = sdi->priv;
 721
 722         /* Always handle pending libusb events. */
 723         tv.tv_sec = tv.tv_usec = 0;
 724         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 725
 726         if (devc->dev_state == STOPPING) {
 727                 /* We've been told to wind up the acquisition. */
 728                 sr_dbg("Stopping acquisition.");
 729
 730                 hantek_6xxx_stop_data_collecting(sdi);
 731                 /*
 732                  * TODO: Doesn't really cancel pending transfers so they might
 733                  * come in after SR_DF_END is sent.
 734                  */
 735                 usb_source_remove(sdi->session, drvc->sr_ctx);
 736
 737                 packet.type = SR_DF_END;
 738                 packet.payload = NULL;
 739                 sr_session_send(sdi, &packet);
 740
 741                 devc->dev_state = IDLE;
 742
 743                 return TRUE;
 744         }
 745
 746         return TRUE;
 747 }
 748
 749 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 750 {
 751         struct dev_context *devc;
 752         struct sr_dev_driver *di = sdi->driver;
 753         struct drv_context *drvc = di->context;
 754
 755         if (sdi->status != SR_ST_ACTIVE)
 756                 return SR_ERR_DEV_CLOSED;
 757
 758         devc = sdi->priv;
 759         devc->cb_data = cb_data;
 760
 761         if (configure_channels(sdi) != SR_OK) {
 762                 sr_err("Failed to configure channels.");
 763                 return SR_ERR;
 764         }
 765
 766         if (hantek_6xxx_init(sdi) != SR_OK)
 767                 return SR_ERR;
 768
 769         /* Send header packet to the session bus. */
 770         std_session_send_df_header(cb_data, LOG_PREFIX);
 771
 772         devc->samp_received = 0;
 773         devc->dev_state = FLUSH;
 774
 775         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 776                        handle_event, (void *)sdi);
 777
 778         hantek_6xxx_start_data_collecting(sdi);
 779
 780         read_channel(sdi, FLUSH_PACKET_SIZE);
 781
 782         return SR_OK;
 783 }
 784
 785 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 786 {
 787         struct dev_context *devc;
 788
 789         (void)cb_data;
 790
 791         if (sdi->status != SR_ST_ACTIVE)
 792                 return SR_ERR;
 793
 794         devc = sdi->priv;
 795         devc->dev_state = STOPPING;
 796
 797         g_free(devc->sample_buf); devc->sample_buf = NULL;
 798
 799         return SR_OK;
 800 }
 801
 802 SR_PRIV struct sr_dev_driver hantek_6xxx_driver_info = {
 803         .name = "hantek-6xxx",
 804         .longname = "Hantek 6xxx",
 805         .api_version = 1,
 806         .init = init,
 807         .cleanup = cleanup,
 808         .scan = scan,
 809         .dev_list = dev_list,
 810         .dev_clear = dev_clear,
 811         .config_get = config_get,
 812         .config_set = config_set,
 813         .config_list = config_list,
 814         .dev_open = dev_open,
 815         .dev_close = dev_close,
 816         .dev_acquisition_start = dev_acquisition_start,
 817         .dev_acquisition_stop = dev_acquisition_stop,
 818         .context = NULL,
 819 };