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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
 167 {
 168         return std_init(di, sr_ctx, LOG_PREFIX);
 169 }
 170
 171 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 172 {
 173         struct drv_context *drvc;
 174         struct dev_context *devc;
 175         struct sr_dev_inst *sdi;
 176         struct sr_usb_dev_inst *usb;
 177         struct sr_config *src;
 178         const struct hantek_6xxx_profile *prof;
 179         GSList *l, *devices, *conn_devices;
 180         struct libusb_device_descriptor des;
 181         libusb_device **devlist;
 182         int i, j;
 183         const char *conn;
 184         char connection_id[64];
 185
 186         drvc = di->context;
 187
 188         devices = 0;
 189
 190         conn = NULL;
 191         for (l = options; l; l = l->next) {
 192                 src = l->data;
 193                 if (src->key == SR_CONF_CONN) {
 194                         conn = g_variant_get_string(src->data, NULL);
 195                         break;
 196                 }
 197         }
 198         if (conn)
 199                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 200         else
 201                 conn_devices = NULL;
 202
 203         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 204         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 205         for (i = 0; devlist[i]; i++) {
 206                 if (conn) {
 207                         usb = NULL;
 208                         for (l = conn_devices; l; l = l->next) {
 209                                 usb = l->data;
 210                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 211                                         && usb->address == libusb_get_device_address(devlist[i]))
 212                                         break;
 213                         }
 214                         if (!l)
 215                                 /* This device matched none of the ones that
 216                                  * matched the conn specification. */
 217                                 continue;
 218                 }
 219
 220                 libusb_get_device_descriptor(devlist[i], &des);
 221
 222                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 223
 224                 prof = NULL;
 225                 for (j = 0; j < (int)ARRAY_SIZE(dev_profiles); j++) {
 226                         if (des.idVendor == dev_profiles[j].orig_vid
 227                                 && des.idProduct == dev_profiles[j].orig_pid) {
 228                                 /* Device matches the pre-firmware profile. */
 229                                 prof = &dev_profiles[j];
 230                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 231                                 sdi = hantek_6xxx_dev_new(prof);
 232                                 sdi->connection_id = g_strdup(connection_id);
 233                                 devices = g_slist_append(devices, sdi);
 234                                 devc = sdi->priv;
 235                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 236                                                 USB_CONFIGURATION, prof->firmware) == SR_OK)
 237                                         /* Remember when the firmware on this device was updated. */
 238                                         devc->fw_updated = g_get_monotonic_time();
 239                                 else
 240                                         sr_err("Firmware upload failed.");
 241                                 /* Dummy USB address of 0xff will get overwritten later. */
 242                                 sdi->conn = sr_usb_dev_inst_new(
 243                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 244                                 break;
 245                         } else if (des.idVendor == dev_profiles[j].fw_vid
 246                                 && des.idProduct == dev_profiles[j].fw_pid) {
 247                                 /* Device matches the post-firmware profile. */
 248                                 prof = &dev_profiles[j];
 249                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 250                                 sdi = hantek_6xxx_dev_new(prof);
 251                                 sdi->connection_id = g_strdup(connection_id);
 252                                 sdi->status = SR_ST_INACTIVE;
 253                                 devices = g_slist_append(devices, sdi);
 254                                 sdi->inst_type = SR_INST_USB;
 255                                 sdi->conn = sr_usb_dev_inst_new(
 256                                                 libusb_get_bus_number(devlist[i]),
 257                                                 libusb_get_device_address(devlist[i]), NULL);
 258                                 break;
 259                         }
 260                 }
 261                 if (!prof)
 262                         /* Not a supported VID/PID. */
 263                         continue;
 264         }
 265         libusb_free_device_list(devlist, 1);
 266
 267         return devices;
 268 }
 269
 270 static int dev_open(struct sr_dev_inst *sdi)
 271 {
 272         struct dev_context *devc;
 273         struct sr_usb_dev_inst *usb;
 274         int64_t timediff_us, timediff_ms;
 275         int err;
 276
 277         devc = sdi->priv;
 278         usb = sdi->conn;
 279
 280         /*
 281          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 282          * for the FX2 to renumerate.
 283          */
 284         err = SR_ERR;
 285         if (devc->fw_updated > 0) {
 286                 sr_info("Waiting for device to reset.");
 287                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 288                 g_usleep(300 * 1000);
 289                 timediff_ms = 0;
 290                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 291                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 292                                 break;
 293                         g_usleep(100 * 1000);
 294                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 295                         timediff_ms = timediff_us / 1000;
 296                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 297                 }
 298                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 299                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 300         } else {
 301                 err = hantek_6xxx_open(sdi);
 302         }
 303
 304         if (err != SR_OK) {
 305                 sr_err("Unable to open device.");
 306                 return SR_ERR;
 307         }
 308
 309         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 310         if (err != 0) {
 311                 sr_err("Unable to claim interface: %s.",
 312                            libusb_error_name(err));
 313                 return SR_ERR;
 314         }
 315
 316         return SR_OK;
 317 }
 318
 319 static int dev_close(struct sr_dev_inst *sdi)
 320 {
 321         hantek_6xxx_close(sdi);
 322
 323         return SR_OK;
 324 }
 325
 326 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 327                 const struct sr_channel_group *cg)
 328 {
 329         struct dev_context *devc;
 330         struct sr_usb_dev_inst *usb;
 331         char str[128];
 332         const uint64_t *vdiv;
 333         int ch_idx;
 334
 335         switch (key) {
 336         case SR_CONF_NUM_VDIV:
 337                 *data = g_variant_new_int32(ARRAY_SIZE(vdivs));
 338                 break;
 339         }
 340
 341         if (!sdi)
 342                 return SR_ERR_ARG;
 343
 344         devc = sdi->priv;
 345         if (!cg) {
 346                 switch (key) {
 347                 case SR_CONF_SAMPLERATE:
 348                         *data = g_variant_new_uint64(devc->samplerate);
 349                         break;
 350                 case SR_CONF_LIMIT_MSEC:
 351                         *data = g_variant_new_uint64(devc->limit_msec);
 352                         break;
 353                 case SR_CONF_LIMIT_SAMPLES:
 354                         *data = g_variant_new_uint64(devc->limit_samples);
 355                         break;
 356                 case SR_CONF_CONN:
 357                         if (!sdi->conn)
 358                                 return SR_ERR_ARG;
 359                         usb = sdi->conn;
 360                         if (usb->address == 255)
 361                                 /* Device still needs to re-enumerate after firmware
 362                                  * upload, so we don't know its (future) address. */
 363                                 return SR_ERR;
 364                         snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 365                         *data = g_variant_new_string(str);
 366                         break;
 367                 default:
 368                         return SR_ERR_NA;
 369                 }
 370         } else {
 371                 if (sdi->channel_groups->data == cg)
 372                         ch_idx = 0;
 373                 else if (sdi->channel_groups->next->data == cg)
 374                         ch_idx = 1;
 375                 else
 376                         return SR_ERR_ARG;
 377                 switch (key) {
 378                 case SR_CONF_VDIV:
 379                         vdiv = vdivs[devc->voltage[ch_idx]];
 380                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 381                         break;
 382                 case SR_CONF_COUPLING:
 383                         *data = g_variant_new_string(coupling[devc->coupling[ch_idx]]);
 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         const char *tmp_str;
 399
 400         if (sdi->status != SR_ST_ACTIVE)
 401                 return SR_ERR_DEV_CLOSED;
 402
 403         ret = SR_OK;
 404         devc = sdi->priv;
 405         if (!cg) {
 406                 switch (key) {
 407                 case SR_CONF_SAMPLERATE:
 408                         devc->samplerate = g_variant_get_uint64(data);
 409                         hantek_6xxx_update_samplerate(sdi);
 410                         break;
 411                 case SR_CONF_LIMIT_MSEC:
 412                         devc->limit_msec = g_variant_get_uint64(data);
 413                         break;
 414                 case SR_CONF_LIMIT_SAMPLES:
 415                         devc->limit_samples = g_variant_get_uint64(data);
 416                         break;
 417                 default:
 418                         ret = SR_ERR_NA;
 419                         break;
 420                 }
 421         } else {
 422                 if (sdi->channel_groups->data == cg)
 423                         ch_idx = 0;
 424                 else if (sdi->channel_groups->next->data == cg)
 425                         ch_idx = 1;
 426                 else
 427                         return SR_ERR_ARG;
 428                 switch (key) {
 429                 case SR_CONF_VDIV:
 430                         g_variant_get(data, "(tt)", &p, &q);
 431                         tmp_int = -1;
 432                         for (i = 0; i < ARRAY_SIZE(vdivs); i++) {
 433                                 if (vdivs[i][0] == p && vdivs[i][1] == q) {
 434                                         tmp_int = i;
 435                                         break;
 436                                 }
 437                         }
 438                         if (tmp_int >= 0) {
 439                                 devc->voltage[ch_idx] = tmp_int;
 440                                 hantek_6xxx_update_vdiv(sdi);
 441                         } else
 442                                 ret = SR_ERR_ARG;
 443                         break;
 444                 case SR_CONF_COUPLING:
 445                         tmp_str = g_variant_get_string(data, NULL);
 446                         for (i = 0; coupling[i]; i++) {
 447                                 if (!strcmp(tmp_str, coupling[i])) {
 448                                         devc->coupling[ch_idx] = i;
 449                                         break;
 450                                 }
 451                         }
 452                         if (coupling[i] == 0)
 453                                 ret = SR_ERR_ARG;
 454                         break;
 455                 default:
 456                         ret = SR_ERR_NA;
 457                         break;
 458                 }
 459         }
 460
 461         return ret;
 462 }
 463
 464 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 465                 const struct sr_channel_group *cg)
 466 {
 467         GVariant *tuple, *rational[2];
 468         GVariantBuilder gvb;
 469         unsigned int i;
 470         GVariant *gvar;
 471
 472         if (key == SR_CONF_SCAN_OPTIONS) {
 473                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 474                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 475                 return SR_OK;
 476         } else if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
 477                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 478                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 479                 return SR_OK;
 480         }
 481
 482         if (!sdi)
 483                 return SR_ERR_ARG;
 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(coupling, ARRAY_SIZE(coupling));
 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;
 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         data_left += MIN_PACKET_SIZE; /* Driver does not handle small buffers. */
 546
 547         sr_spew("data_amount %u", data_left);
 548
 549         return data_left;
 550 }
 551
 552 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 553                 int num_samples)
 554 {
 555         struct sr_datafeed_packet packet;
 556         struct sr_datafeed_analog_old analog;
 557         struct dev_context *devc = sdi->priv;
 558         int num_channels, data_offset, i;
 559
 560         const float ch1_bit = RANGE(0) / 255;
 561         const float ch2_bit = RANGE(1) / 255;
 562         const float ch1_center = RANGE(0) / 2;
 563         const float ch2_center = RANGE(1) / 2;
 564
 565         const gboolean ch1_ena = !!devc->ch_enabled[0];
 566         const gboolean ch2_ena = !!devc->ch_enabled[1];
 567
 568         num_channels = (ch1_ena && ch2_ena) ? 2 : 1;
 569         packet.type = SR_DF_ANALOG_OLD;
 570         packet.payload = &analog;
 571
 572         analog.channels = devc->enabled_channels;
 573         analog.num_samples = num_samples;
 574         analog.mq = SR_MQ_VOLTAGE;
 575         analog.unit = SR_UNIT_VOLT;
 576         analog.mqflags = 0;
 577
 578         analog.data = g_try_malloc(analog.num_samples * sizeof(float) * num_channels);
 579         if (!analog.data) {
 580                 sr_err("Analog data buffer malloc failed.");
 581                 devc->dev_state = STOPPING;
 582                 return;
 583         }
 584
 585         data_offset = 0;
 586         for (i = 0; i < num_samples; i++) {
 587                 /*
 588                  * The device always sends data for both channels. If a channel
 589                  * is disabled, it contains a copy of the enabled channel's
 590                  * data. However, we only send the requested channels to
 591                  * the bus.
 592                  *
 593                  * Voltage values are encoded as a value 0-255, where the
 594                  * value is a point in the range represented by the vdiv
 595                  * setting. There are 10 vertical divs, so e.g. 500mV/div
 596                  * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 597                  */
 598                 if (ch1_ena)
 599                         analog.data[data_offset++] = (ch1_bit * *(buf + i * 2) - ch1_center);
 600                 if (ch2_ena)
 601                         analog.data[data_offset++] = (ch2_bit * *(buf + i * 2 + 1) - ch2_center);
 602         }
 603
 604         sr_session_send(sdi, &packet);
 605         g_free(analog.data);
 606 }
 607
 608 static void send_data(struct sr_dev_inst *sdi, struct libusb_transfer *buf[], uint64_t samples)
 609 {
 610         int i = 0;
 611         uint64_t send = 0;
 612         uint32_t chunk;
 613
 614         while (send < samples) {
 615                 chunk = MIN(samples - send, (uint64_t)(buf[i]->actual_length / NUM_CHANNELS));
 616                 send += chunk;
 617                 send_chunk(sdi, buf[i]->buffer, chunk);
 618
 619                 /*
 620                  * Everything in this transfer was either copied to the buffer
 621                  * or sent to the session bus.
 622                  */
 623                 g_free(buf[i]->buffer);
 624                 libusb_free_transfer(buf[i]);
 625                 i++;
 626         }
 627 }
 628
 629 /*
 630  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 631  * Only channel data comes in asynchronously, and all transfers for this are
 632  * queued up beforehand, so this just needs to chuck the incoming data onto
 633  * the libsigrok session bus.
 634  */
 635 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 636 {
 637         struct sr_dev_inst *sdi;
 638         struct dev_context *devc;
 639
 640         sdi = transfer->user_data;
 641         devc = sdi->priv;
 642
 643         if (devc->dev_state == FLUSH) {
 644                 g_free(transfer->buffer);
 645                 libusb_free_transfer(transfer);
 646                 devc->dev_state = CAPTURE;
 647                 devc->aq_started = g_get_monotonic_time();
 648                 read_channel(sdi, data_amount(sdi));
 649                 return;
 650         }
 651
 652         if (devc->dev_state != CAPTURE)
 653                 return;
 654
 655         if (!devc->sample_buf) {
 656                 devc->sample_buf_size = 10;
 657                 devc->sample_buf = g_try_malloc(devc->sample_buf_size * sizeof(transfer));
 658                 devc->sample_buf_write = 0;
 659         }
 660
 661         if (devc->sample_buf_write >= devc->sample_buf_size) {
 662                 devc->sample_buf_size += 10;
 663                 devc->sample_buf = g_try_realloc(devc->sample_buf,
 664                                 devc->sample_buf_size * sizeof(transfer));
 665                 if (!devc->sample_buf) {
 666                         sr_err("Sample buffer malloc failed.");
 667                         devc->dev_state = STOPPING;
 668                         return;
 669                 }
 670         }
 671
 672         devc->sample_buf[devc->sample_buf_write++] = transfer;
 673         devc->samp_received += transfer->actual_length / NUM_CHANNELS;
 674
 675         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 676                 (uint64_t)(transfer->actual_length * 1000 /
 677                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 678                 NUM_CHANNELS));
 679
 680         sr_spew("receive_transfer(): status %s received %d bytes.",
 681                 libusb_error_name(transfer->status), transfer->actual_length);
 682
 683         if (transfer->actual_length == 0)
 684                 /* Nothing to send to the bus. */
 685                 return;
 686
 687         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 688                 sr_info("Requested number of samples reached, stopping. %"
 689                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 690                         devc->samp_received);
 691                 send_data(sdi, devc->sample_buf, devc->limit_samples);
 692                 sdi->driver->dev_acquisition_stop(sdi);
 693         } else if (devc->limit_msec && (g_get_monotonic_time() -
 694                         devc->aq_started) / 1000 >= devc->limit_msec) {
 695                 sr_info("Requested time limit reached, stopping. %d <= %d",
 696                         (uint32_t)devc->limit_msec,
 697                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 698                 send_data(sdi, devc->sample_buf, devc->samp_received);
 699                 g_free(devc->sample_buf);
 700                 devc->sample_buf = NULL;
 701                 sdi->driver->dev_acquisition_stop(sdi);
 702         } else {
 703                 read_channel(sdi, data_amount(sdi));
 704         }
 705 }
 706
 707 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 708 {
 709         int ret;
 710         struct dev_context *devc;
 711
 712         devc = sdi->priv;
 713
 714         amount = MIN(amount, MAX_PACKET_SIZE);
 715         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 716         devc->read_start_ts = g_get_monotonic_time();
 717         devc->read_data_amount = amount;
 718
 719         return ret;
 720 }
 721
 722 static int handle_event(int fd, int revents, void *cb_data)
 723 {
 724         const struct sr_dev_inst *sdi;
 725         struct timeval tv;
 726         struct sr_dev_driver *di;
 727         struct dev_context *devc;
 728         struct drv_context *drvc;
 729
 730         (void)fd;
 731         (void)revents;
 732
 733         sdi = cb_data;
 734         di = sdi->driver;
 735         drvc = di->context;
 736         devc = sdi->priv;
 737
 738         /* Always handle pending libusb events. */
 739         tv.tv_sec = tv.tv_usec = 0;
 740         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 741
 742         if (devc->dev_state == STOPPING) {
 743                 /* We've been told to wind up the acquisition. */
 744                 sr_dbg("Stopping acquisition.");
 745
 746                 hantek_6xxx_stop_data_collecting(sdi);
 747                 /*
 748                  * TODO: Doesn't really cancel pending transfers so they might
 749                  * come in after SR_DF_END is sent.
 750                  */
 751                 usb_source_remove(sdi->session, drvc->sr_ctx);
 752
 753                 std_session_send_df_end(sdi, LOG_PREFIX);
 754
 755                 devc->dev_state = IDLE;
 756
 757                 return TRUE;
 758         }
 759
 760         return TRUE;
 761 }
 762
 763 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 764 {
 765         struct dev_context *devc;
 766         struct sr_dev_driver *di = sdi->driver;
 767         struct drv_context *drvc = di->context;
 768
 769         if (sdi->status != SR_ST_ACTIVE)
 770                 return SR_ERR_DEV_CLOSED;
 771
 772         devc = sdi->priv;
 773
 774         if (configure_channels(sdi) != SR_OK) {
 775                 sr_err("Failed to configure channels.");
 776                 return SR_ERR;
 777         }
 778
 779         if (hantek_6xxx_init(sdi) != SR_OK)
 780                 return SR_ERR;
 781
 782         std_session_send_df_header(sdi, LOG_PREFIX);
 783
 784         devc->samp_received = 0;
 785         devc->dev_state = FLUSH;
 786
 787         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 788                        handle_event, (void *)sdi);
 789
 790         hantek_6xxx_start_data_collecting(sdi);
 791
 792         read_channel(sdi, FLUSH_PACKET_SIZE);
 793
 794         return SR_OK;
 795 }
 796
 797 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 798 {
 799         struct dev_context *devc;
 800
 801         if (sdi->status != SR_ST_ACTIVE)
 802                 return SR_ERR;
 803
 804         devc = sdi->priv;
 805         devc->dev_state = STOPPING;
 806
 807         g_free(devc->sample_buf); devc->sample_buf = NULL;
 808
 809         return SR_OK;
 810 }
 811
 812 SR_PRIV struct sr_dev_driver hantek_6xxx_driver_info = {
 813         .name = "hantek-6xxx",
 814         .longname = "Hantek 6xxx",
 815         .api_version = 1,
 816         .init = init,
 817         .cleanup = std_cleanup,
 818         .scan = scan,
 819         .dev_list = std_dev_list,
 820         .dev_clear = dev_clear,
 821         .config_get = config_get,
 822         .config_set = config_set,
 823         .config_list = config_list,
 824         .dev_open = dev_open,
 825         .dev_close = dev_close,
 826         .dev_acquisition_start = dev_acquisition_start,
 827         .dev_acquisition_stop = dev_acquisition_stop,
 828         .context = NULL,
 829 };