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 <math.h>
  22 #include "protocol.h"
  23
  24 /* Max time in ms before we want to check on USB events */
  25 #define TICK 200
  26
  27 #define RANGE(ch) (((float)devc->vdivs[devc->voltage[ch]][0] / devc->vdivs[devc->voltage[ch]][1]) * VDIV_MULTIPLIER)
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t drvopts[] = {
  34         SR_CONF_OSCILLOSCOPE,
  35 };
  36
  37 static const uint32_t devopts[] = {
  38         SR_CONF_CONN | SR_CONF_GET,
  39         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  40         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  41         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  42         SR_CONF_NUM_VDIV | SR_CONF_GET,
  43 };
  44
  45 static const uint32_t devopts_cg[] = {
  46         SR_CONF_COUPLING | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_VDIV | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48 };
  49
  50 static const char *channel_names[] = {
  51         "CH1", "CH2",
  52 };
  53
  54 static const char *dc_coupling[] = {
  55         "DC",
  56 };
  57
  58 static const char *acdc_coupling[] = {
  59         "AC", "DC",
  60 };
  61
  62 static const uint64_t vdivs[][2] = {
  63         VDIV_VALUES
  64 };
  65
  66 static const uint64_t vdivs_instrustar[][2] = {
  67         VDIV_VALUES_INSTRUSTAR
  68 };
  69
  70 static const uint64_t samplerates[] = {
  71         SAMPLERATE_VALUES
  72 };
  73
  74 static const struct hantek_6xxx_profile dev_profiles[] = {
  75         {
  76                 /* Windows: "Hantek6022BE DRIVER 1": 04b4:6022 */
  77                 0x04b4, 0x6022, 0x1d50, 0x608e, 0x0001,
  78                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  79                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  80                 ARRAY_AND_SIZE(vdivs),
  81         },
  82         {
  83                 /* Windows: "Hantek6022BE DRIVER 2": 04b5:6022 */
  84                 0x04b5, 0x6022, 0x1d50, 0x608e, 0x0001,
  85                 "Hantek", "6022BE", "fx2lafw-hantek-6022be.fw",
  86                 ARRAY_AND_SIZE(dc_coupling), FALSE,
  87                 ARRAY_AND_SIZE(vdivs),
  88         },
  89         {
  90                 0x8102, 0x8102, 0x1d50, 0x608e, 0x0002,
  91                 "Sainsmart", "DDS120", "fx2lafw-sainsmart-dds120.fw",
  92                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
  93                 ARRAY_AND_SIZE(vdivs),
  94         },
  95         {
  96                 /* Windows: "Hantek6022BL DRIVER 1": 04b4:602a */
  97                 0x04b4, 0x602a, 0x1d50, 0x608e, 0x0003,
  98                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
  99                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 100                 ARRAY_AND_SIZE(vdivs),
 101         },
 102         {
 103                 /* Windows: "Hantek6022BL DRIVER 2": 04b5:602a */
 104                 0x04b5, 0x602a, 0x1d50, 0x608e, 0x0003,
 105                 "Hantek", "6022BL", "fx2lafw-hantek-6022bl.fw",
 106                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 107                 ARRAY_AND_SIZE(vdivs),
 108         },
 109         {
 110                 0xd4a2, 0x5660, 0x1d50, 0x608e, 0x0004,
 111                 "YiXingDianZi", "MDSO", "fx2lafw-yixingdianzi-mdso.fw",
 112                 ARRAY_AND_SIZE(dc_coupling), FALSE,
 113                 ARRAY_AND_SIZE(vdivs),
 114         },
 115         {
 116                 /*"InstrustarISDS205": d4a2:5661 */
 117                 0xd4a2, 0x5661, 0x1d50, 0x608e, 0x0005,
 118                 "Instrustar", "ISDS205B", "fx2lafw-instrustar-isds205b.fw",
 119                 ARRAY_AND_SIZE(acdc_coupling), TRUE,
 120                 ARRAY_AND_SIZE(vdivs_instrustar),
 121         },
 122         ALL_ZERO
 123 };
 124
 125
 126 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount);
 127
 128 static struct sr_dev_inst *hantek_6xxx_dev_new(const struct hantek_6xxx_profile *prof)
 129 {
 130         struct sr_dev_inst *sdi;
 131         struct sr_channel *ch;
 132         struct sr_channel_group *cg;
 133         struct dev_context *devc;
 134         unsigned int i;
 135
 136         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 137         sdi->status = SR_ST_INITIALIZING;
 138         sdi->vendor = g_strdup(prof->vendor);
 139         sdi->model = g_strdup(prof->model);
 140
 141         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 142                 ch = sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 143                 cg = sr_channel_group_new(sdi, channel_names[i], NULL);
 144                 cg->channels = g_slist_append(cg->channels, ch);
 145         }
 146
 147         devc = g_malloc0(sizeof(struct dev_context));
 148
 149         for (i = 0; i < NUM_CHANNELS; i++) {
 150                 devc->ch_enabled[i] = TRUE;
 151                 devc->voltage[i] = DEFAULT_VOLTAGE;
 152                 devc->coupling[i] = DEFAULT_COUPLING;
 153         }
 154         devc->coupling_vals = prof->coupling_vals;
 155         devc->coupling_tab_size = prof->coupling_tab_size;
 156         devc->has_coupling = prof->has_coupling;
 157         devc->vdivs = prof->vdivs;
 158         devc->vdivs_size = prof->vdivs_size;
 159
 160         devc->profile = prof;
 161         devc->dev_state = IDLE;
 162         devc->samplerate = DEFAULT_SAMPLERATE;
 163
 164         sdi->priv = devc;
 165
 166         return sdi;
 167 }
 168
 169 static int configure_channels(const struct sr_dev_inst *sdi)
 170 {
 171         struct dev_context *devc;
 172         const GSList *l;
 173         int p;
 174         struct sr_channel *ch;
 175         devc = sdi->priv;
 176
 177         g_slist_free(devc->enabled_channels);
 178         devc->enabled_channels = NULL;
 179         memset(devc->ch_enabled, 0, sizeof(devc->ch_enabled));
 180
 181         for (l = sdi->channels, p = 0; l; l = l->next, p++) {
 182                 ch = l->data;
 183                 if (p < NUM_CHANNELS) {
 184                         devc->ch_enabled[p] = ch->enabled;
 185                         devc->enabled_channels = g_slist_append(devc->enabled_channels, ch);
 186                 }
 187         }
 188
 189         return SR_OK;
 190 }
 191
 192 static void clear_helper(struct dev_context *devc)
 193 {
 194         g_slist_free(devc->enabled_channels);
 195 }
 196
 197 static int dev_clear(const struct sr_dev_driver *di)
 198 {
 199         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 200 }
 201
 202 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 203 {
 204         struct drv_context *drvc;
 205         struct dev_context *devc;
 206         struct sr_dev_inst *sdi;
 207         struct sr_usb_dev_inst *usb;
 208         struct sr_config *src;
 209         const struct hantek_6xxx_profile *prof;
 210         GSList *l, *devices, *conn_devices;
 211         struct libusb_device_descriptor des;
 212         libusb_device **devlist;
 213         int i, j;
 214         const char *conn;
 215         char connection_id[64];
 216
 217         drvc = di->context;
 218
 219         devices = 0;
 220
 221         conn = NULL;
 222         for (l = options; l; l = l->next) {
 223                 src = l->data;
 224                 if (src->key == SR_CONF_CONN) {
 225                         conn = g_variant_get_string(src->data, NULL);
 226                         break;
 227                 }
 228         }
 229         if (conn)
 230                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 231         else
 232                 conn_devices = NULL;
 233
 234         /* Find all Hantek 60xx devices and upload firmware to all of them. */
 235         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 236         for (i = 0; devlist[i]; i++) {
 237                 if (conn) {
 238                         usb = NULL;
 239                         for (l = conn_devices; l; l = l->next) {
 240                                 usb = l->data;
 241                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 242                                         && usb->address == libusb_get_device_address(devlist[i]))
 243                                         break;
 244                         }
 245                         if (!l)
 246                                 /* This device matched none of the ones that
 247                                  * matched the conn specification. */
 248                                 continue;
 249                 }
 250
 251                 libusb_get_device_descriptor(devlist[i], &des);
 252
 253                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 254                         continue;
 255
 256                 prof = NULL;
 257                 for (j = 0; dev_profiles[j].orig_vid; j++) {
 258                         if (des.idVendor == dev_profiles[j].orig_vid
 259                                 && des.idProduct == dev_profiles[j].orig_pid) {
 260                                 /* Device matches the pre-firmware profile. */
 261                                 prof = &dev_profiles[j];
 262                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 263                                 sdi = hantek_6xxx_dev_new(prof);
 264                                 sdi->connection_id = g_strdup(connection_id);
 265                                 devices = g_slist_append(devices, sdi);
 266                                 devc = sdi->priv;
 267                                 if (ezusb_upload_firmware(drvc->sr_ctx, devlist[i],
 268                                                 USB_CONFIGURATION, prof->firmware) == SR_OK) {
 269                                         /* Remember when the firmware on this device was updated. */
 270                                         devc->fw_updated = g_get_monotonic_time();
 271                                 } else {
 272                                         sr_err("Firmware upload failed, name %s.", prof->firmware);
 273                                 }
 274                                 /* Dummy USB address of 0xff will get overwritten later. */
 275                                 sdi->conn = sr_usb_dev_inst_new(
 276                                                 libusb_get_bus_number(devlist[i]), 0xff, NULL);
 277                                 break;
 278                         } else if (des.idVendor == dev_profiles[j].fw_vid
 279                                 && des.idProduct == dev_profiles[j].fw_pid
 280                                 && des.bcdDevice == dev_profiles[j].fw_prod_ver) {
 281                                 /* Device matches the post-firmware profile. */
 282                                 prof = &dev_profiles[j];
 283                                 sr_dbg("Found a %s %s.", prof->vendor, prof->model);
 284                                 sdi = hantek_6xxx_dev_new(prof);
 285                                 sdi->connection_id = g_strdup(connection_id);
 286                                 sdi->status = SR_ST_INACTIVE;
 287                                 devices = g_slist_append(devices, sdi);
 288                                 sdi->inst_type = SR_INST_USB;
 289                                 sdi->conn = sr_usb_dev_inst_new(
 290                                                 libusb_get_bus_number(devlist[i]),
 291                                                 libusb_get_device_address(devlist[i]), NULL);
 292                                 break;
 293                         }
 294                 }
 295                 if (!prof)
 296                         /* Not a supported VID/PID. */
 297                         continue;
 298         }
 299         libusb_free_device_list(devlist, 1);
 300
 301         return std_scan_complete(di, devices);
 302 }
 303
 304 static int dev_open(struct sr_dev_inst *sdi)
 305 {
 306         struct dev_context *devc;
 307         struct sr_usb_dev_inst *usb;
 308         int64_t timediff_us, timediff_ms;
 309         int err;
 310
 311         devc = sdi->priv;
 312         usb = sdi->conn;
 313
 314         /*
 315          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 316          * for the FX2 to renumerate.
 317          */
 318         err = SR_ERR;
 319         if (devc->fw_updated > 0) {
 320                 sr_info("Waiting for device to reset.");
 321                 /* Takes >= 300ms for the FX2 to be gone from the USB bus. */
 322                 g_usleep(300 * 1000);
 323                 timediff_ms = 0;
 324                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 325                         if ((err = hantek_6xxx_open(sdi)) == SR_OK)
 326                                 break;
 327                         g_usleep(100 * 1000);
 328                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 329                         timediff_ms = timediff_us / 1000;
 330                         sr_spew("Waited %" PRIi64 " ms.", timediff_ms);
 331                 }
 332                 if (timediff_ms < MAX_RENUM_DELAY_MS)
 333                         sr_info("Device came back after %"PRIu64" ms.", timediff_ms);
 334         } else {
 335                 err = hantek_6xxx_open(sdi);
 336         }
 337
 338         if (err != SR_OK) {
 339                 sr_err("Unable to open device.");
 340                 return SR_ERR;
 341         }
 342
 343         err = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 344         if (err != 0) {
 345                 sr_err("Unable to claim interface: %s.",
 346                         libusb_error_name(err));
 347                 return SR_ERR;
 348         }
 349
 350         return SR_OK;
 351 }
 352
 353 static int dev_close(struct sr_dev_inst *sdi)
 354 {
 355         hantek_6xxx_close(sdi);
 356
 357         return SR_OK;
 358 }
 359
 360 static int config_get(uint32_t key, GVariant **data,
 361         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 362 {
 363         struct dev_context *devc;
 364         struct sr_usb_dev_inst *usb;
 365         const uint64_t *vdiv;
 366         int ch_idx;
 367
 368         if (!sdi)
 369                 return SR_ERR_ARG;
 370
 371         devc = sdi->priv;
 372
 373         switch (key) {
 374         case SR_CONF_NUM_VDIV:
 375                 *data = g_variant_new_int32(devc->vdivs_size);
 376                 break;
 377         }
 378
 379         if (!cg) {
 380                 switch (key) {
 381                 case SR_CONF_SAMPLERATE:
 382                         *data = g_variant_new_uint64(devc->samplerate);
 383                         break;
 384                 case SR_CONF_LIMIT_MSEC:
 385                         *data = g_variant_new_uint64(devc->limit_msec);
 386                         break;
 387                 case SR_CONF_LIMIT_SAMPLES:
 388                         *data = g_variant_new_uint64(devc->limit_samples);
 389                         break;
 390                 case SR_CONF_CONN:
 391                         if (!sdi->conn)
 392                                 return SR_ERR_ARG;
 393                         usb = sdi->conn;
 394                         if (usb->address == 255)
 395                                 /* Device still needs to re-enumerate after firmware
 396                                  * upload, so we don't know its (future) address. */
 397                                 return SR_ERR;
 398                         *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 399                         break;
 400                 default:
 401                         return SR_ERR_NA;
 402                 }
 403         } else {
 404                 if (sdi->channel_groups->data == cg)
 405                         ch_idx = 0;
 406                 else if (sdi->channel_groups->next->data == cg)
 407                         ch_idx = 1;
 408                 else
 409                         return SR_ERR_ARG;
 410                 switch (key) {
 411                 case SR_CONF_VDIV:
 412                         vdiv = devc->vdivs[devc->voltage[ch_idx]];
 413                         *data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 414                         break;
 415                 case SR_CONF_COUPLING:
 416                         *data = g_variant_new_string((devc->coupling[ch_idx] \
 417                                         == COUPLING_DC) ? "DC" : "AC");
 418                         break;
 419                 }
 420         }
 421
 422         return SR_OK;
 423 }
 424
 425 static int config_set(uint32_t key, GVariant *data,
 426         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 427 {
 428         struct dev_context *devc;
 429         int ch_idx, idx;
 430
 431         devc = sdi->priv;
 432         if (!cg) {
 433                 switch (key) {
 434                 case SR_CONF_SAMPLERATE:
 435                         devc->samplerate = g_variant_get_uint64(data);
 436                         hantek_6xxx_update_samplerate(sdi);
 437                         break;
 438                 case SR_CONF_LIMIT_MSEC:
 439                         devc->limit_msec = g_variant_get_uint64(data);
 440                         break;
 441                 case SR_CONF_LIMIT_SAMPLES:
 442                         devc->limit_samples = g_variant_get_uint64(data);
 443                         break;
 444                 default:
 445                         return SR_ERR_NA;
 446                 }
 447         } else {
 448                 if (sdi->channel_groups->data == cg)
 449                         ch_idx = 0;
 450                 else if (sdi->channel_groups->next->data == cg)
 451                         ch_idx = 1;
 452                 else
 453                         return SR_ERR_ARG;
 454                 switch (key) {
 455                 case SR_CONF_VDIV:
 456                         if ((idx = std_u64_tuple_idx(data, devc->vdivs, devc->vdivs_size)) < 0)
 457                                 return SR_ERR_ARG;
 458                         devc->voltage[ch_idx] = idx;
 459                         hantek_6xxx_update_vdiv(sdi);
 460                         break;
 461                 case SR_CONF_COUPLING:
 462                         if ((idx = std_str_idx(data, devc->coupling_vals,
 463                                                 devc->coupling_tab_size)) < 0)
 464                                 return SR_ERR_ARG;
 465                         devc->coupling[ch_idx] = idx;
 466                         hantek_6xxx_update_coupling(sdi);
 467                         break;
 468                 default:
 469                         return SR_ERR_NA;
 470                 }
 471         }
 472
 473         return SR_OK;
 474 }
 475
 476 static int config_list(uint32_t key, GVariant **data,
 477         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 478 {
 479         struct dev_context *devc;
 480
 481         devc = (sdi) ? sdi->priv : NULL;
 482
 483         if (!cg) {
 484                 switch (key) {
 485                 case SR_CONF_SCAN_OPTIONS:
 486                 case SR_CONF_DEVICE_OPTIONS:
 487                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 488                 case SR_CONF_SAMPLERATE:
 489                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates));
 490                         break;
 491                 default:
 492                         return SR_ERR_NA;
 493                 }
 494         } else {
 495                 switch (key) {
 496                 case SR_CONF_DEVICE_OPTIONS:
 497                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 498                         break;
 499                 case SR_CONF_COUPLING:
 500                         if (!devc)
 501                                 return SR_ERR_ARG;
 502                         *data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 503                         break;
 504                 case SR_CONF_VDIV:
 505                         if (!devc)
 506                                 return SR_ERR_ARG;
 507                         *data = std_gvar_tuple_array(devc->vdivs,devc->vdivs_size);
 508                         break;
 509                 default:
 510                         return SR_ERR_NA;
 511                 }
 512         }
 513
 514         return SR_OK;
 515 }
 516
 517 /* Minimise data amount for limit_samples and limit_msec limits. */
 518 static uint32_t data_amount(const struct sr_dev_inst *sdi)
 519 {
 520         struct dev_context *devc = sdi->priv;
 521         uint32_t data_left, data_left_2, i;
 522         int32_t time_left;
 523
 524         if (devc->limit_msec) {
 525                 time_left = devc->limit_msec - (g_get_monotonic_time() - devc->aq_started) / 1000;
 526                 data_left = devc->samplerate * MAX(time_left, 0) * NUM_CHANNELS / 1000;
 527         } else if (devc->limit_samples) {
 528                 data_left = (devc->limit_samples - devc->samp_received) * NUM_CHANNELS;
 529         } else {
 530                 data_left = devc->samplerate * NUM_CHANNELS;
 531         }
 532
 533         /* Round up to nearest power of two. */
 534         for (i = MIN_PACKET_SIZE; i < data_left; i *= 2)
 535                 ;
 536         data_left_2 = i;
 537
 538         sr_spew("data_amount: %u (rounded to power of 2: %u)", data_left, data_left_2);
 539
 540         return data_left_2;
 541 }
 542
 543 static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 544                 int num_samples)
 545 {
 546         struct sr_datafeed_packet packet;
 547         struct sr_datafeed_analog analog;
 548         struct sr_analog_encoding encoding;
 549         struct sr_analog_meaning meaning;
 550         struct sr_analog_spec spec;
 551         struct dev_context *devc = sdi->priv;
 552         GSList *channels = devc->enabled_channels;
 553
 554         const float ch_bit[] = { RANGE(0) / 255, RANGE(1) / 255 };
 555         const float ch_center[] = { RANGE(0) / 2, RANGE(1) / 2 };
 556
 557         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
 558
 559         packet.type = SR_DF_ANALOG;
 560         packet.payload = &analog;
 561
 562         analog.num_samples = num_samples;
 563         analog.meaning->mq = SR_MQ_VOLTAGE;
 564         analog.meaning->unit = SR_UNIT_VOLT;
 565         analog.meaning->mqflags = 0;
 566
 567         analog.data = g_try_malloc(num_samples * sizeof(float));
 568         if (!analog.data) {
 569                 sr_err("Analog data buffer malloc failed.");
 570                 devc->dev_state = STOPPING;
 571                 return;
 572         }
 573
 574         for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 575                 if (!devc->ch_enabled[ch])
 576                         continue;
 577
 578                 float vdivlog = log10f(ch_bit[ch]);
 579                 int digits = -(int)vdivlog + (vdivlog < 0.0);
 580                 analog.encoding->digits = digits;
 581                 analog.spec->spec_digits = digits;
 582                 analog.meaning->channels = g_slist_append(NULL, channels->data);
 583
 584                 for (int i = 0; i < num_samples; i++) {
 585                         /*
 586                          * The device always sends data for both channels. If a channel
 587                          * is disabled, it contains a copy of the enabled channel's
 588                          * data. However, we only send the requested channels to
 589                          * the bus.
 590                          *
 591                          * Voltage values are encoded as a value 0-255, where the
 592                          * value is a point in the range represented by the vdiv
 593                          * setting. There are 10 vertical divs, so e.g. 500mV/div
 594                          * represents 5V peak-to-peak where 0 = -2.5V and 255 = +2.5V.
 595                          */
 596                         ((float *)analog.data)[i] = ch_bit[ch] * *(buf + i * 2 + ch) - ch_center[ch];
 597                 }
 598
 599                 sr_session_send(sdi, &packet);
 600                 g_slist_free(analog.meaning->channels);
 601
 602                 channels = channels->next;
 603         }
 604         g_free(analog.data);
 605 }
 606
 607 /*
 608  * Called by libusb (as triggered by handle_event()) when a transfer comes in.
 609  * Only channel data comes in asynchronously, and all transfers for this are
 610  * queued up beforehand, so this just needs to chuck the incoming data onto
 611  * the libsigrok session bus.
 612  */
 613 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 614 {
 615         struct sr_dev_inst *sdi;
 616         struct dev_context *devc;
 617
 618         sdi = transfer->user_data;
 619         devc = sdi->priv;
 620
 621         if (devc->dev_state == FLUSH) {
 622                 g_free(transfer->buffer);
 623                 libusb_free_transfer(transfer);
 624                 devc->dev_state = CAPTURE;
 625                 devc->aq_started = g_get_monotonic_time();
 626                 read_channel(sdi, data_amount(sdi));
 627                 return;
 628         }
 629
 630         if (devc->dev_state != CAPTURE)
 631                 return;
 632
 633         sr_spew("receive_transfer(): calculated samplerate == %" PRIu64 "ks/s",
 634                 (uint64_t)(transfer->actual_length * 1000 /
 635                 (g_get_monotonic_time() - devc->read_start_ts + 1) /
 636                 NUM_CHANNELS));
 637
 638         sr_spew("receive_transfer(): status %s received %d bytes.",
 639                 libusb_error_name(transfer->status), transfer->actual_length);
 640
 641         if (transfer->actual_length == 0)
 642                 /* Nothing to send to the bus. */
 643                 return;
 644
 645         unsigned samples_received = transfer->actual_length / NUM_CHANNELS;
 646         send_chunk(sdi, transfer->buffer, samples_received);
 647         devc->samp_received += samples_received;
 648
 649         g_free(transfer->buffer);
 650         libusb_free_transfer(transfer);
 651
 652         if (devc->limit_samples && devc->samp_received >= devc->limit_samples) {
 653                 sr_info("Requested number of samples reached, stopping. %"
 654                         PRIu64 " <= %" PRIu64, devc->limit_samples,
 655                         devc->samp_received);
 656                 sr_dev_acquisition_stop(sdi);
 657         } else if (devc->limit_msec && (g_get_monotonic_time() -
 658                         devc->aq_started) / 1000 >= devc->limit_msec) {
 659                 sr_info("Requested time limit reached, stopping. %d <= %d",
 660                         (uint32_t)devc->limit_msec,
 661                         (uint32_t)(g_get_monotonic_time() - devc->aq_started) / 1000);
 662                 sr_dev_acquisition_stop(sdi);
 663         } else {
 664                 read_channel(sdi, data_amount(sdi));
 665         }
 666 }
 667
 668 static int read_channel(const struct sr_dev_inst *sdi, uint32_t amount)
 669 {
 670         int ret;
 671         struct dev_context *devc;
 672
 673         devc = sdi->priv;
 674
 675         amount = MIN(amount, MAX_PACKET_SIZE);
 676         ret = hantek_6xxx_get_channeldata(sdi, receive_transfer, amount);
 677         devc->read_start_ts = g_get_monotonic_time();
 678
 679         return ret;
 680 }
 681
 682 static int handle_event(int fd, int revents, void *cb_data)
 683 {
 684         const struct sr_dev_inst *sdi;
 685         struct timeval tv;
 686         struct sr_dev_driver *di;
 687         struct dev_context *devc;
 688         struct drv_context *drvc;
 689
 690         (void)fd;
 691         (void)revents;
 692
 693         sdi = cb_data;
 694         di = sdi->driver;
 695         drvc = di->context;
 696         devc = sdi->priv;
 697
 698         /* Always handle pending libusb events. */
 699         tv.tv_sec = tv.tv_usec = 0;
 700         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 701
 702         if (devc->dev_state == STOPPING) {
 703                 /* We've been told to wind up the acquisition. */
 704                 sr_dbg("Stopping acquisition.");
 705
 706                 hantek_6xxx_stop_data_collecting(sdi);
 707                 /*
 708                  * TODO: Doesn't really cancel pending transfers so they might
 709                  * come in after SR_DF_END is sent.
 710                  */
 711                 usb_source_remove(sdi->session, drvc->sr_ctx);
 712
 713                 std_session_send_df_end(sdi);
 714
 715                 devc->dev_state = IDLE;
 716
 717                 return TRUE;
 718         }
 719
 720         return TRUE;
 721 }
 722
 723 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 724 {
 725         struct dev_context *devc;
 726         struct sr_dev_driver *di = sdi->driver;
 727         struct drv_context *drvc = di->context;
 728
 729         devc = sdi->priv;
 730
 731         if (configure_channels(sdi) != SR_OK) {
 732                 sr_err("Failed to configure channels.");
 733                 return SR_ERR;
 734         }
 735
 736         if (hantek_6xxx_init(sdi) != SR_OK)
 737                 return SR_ERR;
 738
 739         std_session_send_df_header(sdi);
 740
 741         devc->samp_received = 0;
 742         devc->dev_state = FLUSH;
 743
 744         usb_source_add(sdi->session, drvc->sr_ctx, TICK,
 745                        handle_event, (void *)sdi);
 746
 747         hantek_6xxx_start_data_collecting(sdi);
 748
 749         read_channel(sdi, FLUSH_PACKET_SIZE);
 750
 751         return SR_OK;
 752 }
 753
 754 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 755 {
 756         struct dev_context *devc;
 757
 758         devc = sdi->priv;
 759         devc->dev_state = STOPPING;
 760
 761         return SR_OK;
 762 }
 763
 764 static struct sr_dev_driver hantek_6xxx_driver_info = {
 765         .name = "hantek-6xxx",
 766         .longname = "Hantek 6xxx",
 767         .api_version = 1,
 768         .init = std_init,
 769         .cleanup = std_cleanup,
 770         .scan = scan,
 771         .dev_list = std_dev_list,
 772         .dev_clear = dev_clear,
 773         .config_get = config_get,
 774         .config_set = config_set,
 775         .config_list = config_list,
 776         .dev_open = dev_open,
 777         .dev_close = dev_close,
 778         .dev_acquisition_start = dev_acquisition_start,
 779         .dev_acquisition_stop = dev_acquisition_stop,
 780         .context = NULL,
 781 };
 782 SR_REGISTER_DEV_DRIVER(hantek_6xxx_driver_info);