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