src/hardware/lascar-el-usb/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 <stdlib.h>
  22 #include <sys/time.h>
  23 #include <string.h>
  24 #include <math.h>
  25 #include <glib.h>
  26 #include <libsigrok/libsigrok.h>
  27 #include "libsigrok-internal.h"
  28 #include "protocol.h"
  29
  30 extern SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
  31 struct sr_dev_driver *di = &lascar_el_usb_driver_info;
  32
  33 static const struct elusb_profile profiles[] = {
  34         { 1, "EL-USB-1", LOG_UNSUPPORTED },
  35         { 2, "EL-USB-1", LOG_UNSUPPORTED },
  36         { 3, "EL-USB-2", LOG_TEMP_RH },
  37         { 4, "EL-USB-3", LOG_UNSUPPORTED },
  38         { 5, "EL-USB-4", LOG_UNSUPPORTED },
  39         { 6, "EL-USB-3", LOG_UNSUPPORTED },
  40         { 7, "EL-USB-4", LOG_UNSUPPORTED },
  41         { 8, "EL-USB-LITE", LOG_UNSUPPORTED },
  42         { 9, "EL-USB-CO", LOG_CO },
  43         { 10, "EL-USB-TC", LOG_UNSUPPORTED },
  44         { 11, "EL-USB-CO300", LOG_CO },
  45         { 12, "EL-USB-2-LCD", LOG_TEMP_RH },
  46         { 13, "EL-USB-2+", LOG_TEMP_RH },
  47         { 14, "EL-USB-1-PRO", LOG_UNSUPPORTED },
  48         { 15, "EL-USB-TC-LCD", LOG_UNSUPPORTED },
  49         { 16, "EL-USB-2-LCD+", LOG_TEMP_RH },
  50         { 17, "EL-USB-5", LOG_UNSUPPORTED },
  51         { 18, "EL-USB-1-RCG", LOG_UNSUPPORTED },
  52         { 19, "EL-USB-1-LCD", LOG_UNSUPPORTED },
  53         { 20, "EL-OEM-3", LOG_UNSUPPORTED },
  54         { 21, "EL-USB-1-LCD", LOG_UNSUPPORTED },
  55         ALL_ZERO
  56 };
  57
  58 static libusb_device_handle *lascar_open(struct libusb_device *dev)
  59 {
  60         libusb_device_handle *dev_hdl;
  61         int ret;
  62
  63         if ((ret = libusb_open(dev, &dev_hdl)) != 0) {
  64                 sr_dbg("failed to open device for scan: %s",
  65                                 libusb_error_name(ret));
  66                 return NULL;
  67         }
  68
  69         /* Some of these fail, but it needs doing -- some sort of mode
  70          * setup for the SiLabs F32x. */
  71         libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
  72                         0x00, 0xffff, 0x00, NULL, 0, 50);
  73         libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
  74                         0x02, 0x0002, 0x00, NULL, 0, 50);
  75         libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
  76                         0x02, 0x0001, 0x00, NULL, 0, 50);
  77
  78         return dev_hdl;
  79 }
  80
  81 static void LIBUSB_CALL mark_xfer(struct libusb_transfer *xfer)
  82 {
  83
  84         xfer->user_data = GINT_TO_POINTER(1);
  85
  86 }
  87
  88 SR_PRIV int lascar_get_config(libusb_device_handle *dev_hdl,
  89                 unsigned char *configblock, int *configlen)
  90 {
  91         struct drv_context *drvc;
  92         struct libusb_transfer *xfer_in, *xfer_out;
  93         struct timeval tv;
  94         int64_t start;
  95         int buflen;
  96         unsigned char cmd[3], buf[MAX_CONFIGBLOCK_SIZE];
  97
  98         sr_spew("Reading config block.");
  99
 100         drvc = di->context;
 101         *configlen = 0;
 102
 103         if (!(xfer_in = libusb_alloc_transfer(0)) ||
 104                         !(xfer_out = libusb_alloc_transfer(0)))
 105                 return SR_ERR;
 106
 107         /* Flush anything the F321 still has queued. */
 108         while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
 109                         5) == 0 && buflen > 0)
 110                 ;
 111
 112         /* Keep a read request waiting in the wings, ready to pounce
 113          * the moment the device sends something. */
 114         libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
 115                         buf, 256, mark_xfer, 0, BULK_XFER_TIMEOUT);
 116         if (libusb_submit_transfer(xfer_in) != 0)
 117                 goto cleanup;
 118
 119         /* Request device configuration structure. */
 120         cmd[0] = 0x00;
 121         cmd[1] = 0xff;
 122         cmd[2] = 0xff;
 123         libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
 124                         cmd, 3, mark_xfer, 0, 100);
 125         if (libusb_submit_transfer(xfer_out) != 0)
 126                 goto cleanup;
 127
 128         tv.tv_sec = 0;
 129         tv.tv_usec = 0;
 130         start = g_get_monotonic_time();
 131         while (!xfer_in->user_data || !xfer_out->user_data) {
 132                 if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
 133                         start = 0;
 134                         break;
 135                 }
 136                 g_usleep(SLEEP_US_LONG);
 137                 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 138         }
 139         if (!start) {
 140                 sr_dbg("no response");
 141                 goto cleanup;
 142         }
 143         if (xfer_in->actual_length != 3) {
 144                 sr_dbg("expected 3-byte header, got %d bytes", xfer_in->actual_length);
 145                 goto cleanup;
 146         }
 147
 148         /* Got configuration structure header. */
 149         sr_spew("Response to config request: 0x%.2x 0x%.2x 0x%.2x ",
 150                         buf[0], buf[1], buf[2]);
 151         buflen = buf[1] | (buf[2] << 8);
 152         if (buf[0] != 0x02 || buflen > MAX_CONFIGBLOCK_SIZE) {
 153                 sr_dbg("Invalid response to config request: "
 154                                 "0x%.2x 0x%.2x 0x%.2x ", buf[0], buf[1], buf[2]);
 155                 libusb_close(dev_hdl);
 156                 goto cleanup;
 157         }
 158
 159         /* Get configuration structure. */
 160         xfer_in->length = buflen;
 161         xfer_in->user_data = 0;
 162         if (libusb_submit_transfer(xfer_in) != 0)
 163                 goto cleanup;
 164         while (!xfer_in->user_data) {
 165                 if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
 166                         start = 0;
 167                         break;
 168                 }
 169                 g_usleep(SLEEP_US_LONG);
 170                 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 171         }
 172         if (!start) {
 173                 sr_dbg("Timeout waiting for configuration structure.");
 174                 goto cleanup;
 175         }
 176         if (xfer_in->actual_length != buflen) {
 177                 sr_dbg("expected %d-byte structure, got %d bytes", buflen,
 178                                 xfer_in->actual_length);
 179                 goto cleanup;
 180         }
 181
 182         memcpy(configblock, buf, buflen);
 183         *configlen = buflen;
 184
 185 cleanup:
 186         if (!xfer_in->user_data || !xfer_out->user_data) {
 187                 if (!xfer_in->user_data)
 188                         libusb_cancel_transfer(xfer_in);
 189                 if (!xfer_out->user_data)
 190                         libusb_cancel_transfer(xfer_out);
 191                 start = g_get_monotonic_time();
 192                 while (!xfer_in->user_data || !xfer_out->user_data) {
 193                         if (g_get_monotonic_time() - start > EVENTS_TIMEOUT)
 194                                 break;
 195                         g_usleep(SLEEP_US_SHORT);
 196                         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 197                 }
 198         }
 199         libusb_free_transfer(xfer_in);
 200         libusb_free_transfer(xfer_out);
 201
 202         return *configlen ? SR_OK : SR_ERR;
 203 }
 204
 205 static int lascar_save_config(libusb_device_handle *dev_hdl,
 206                 unsigned char *config, int configlen)
 207 {
 208         struct drv_context *drvc;
 209         struct libusb_transfer *xfer_in, *xfer_out;
 210         struct timeval tv;
 211         int64_t start;
 212         int buflen, ret;
 213         unsigned char cmd[3], buf[256];
 214
 215         sr_spew("Writing config block.");
 216
 217         drvc = di->context;
 218
 219         if (!(xfer_in = libusb_alloc_transfer(0)) ||
 220                         !(xfer_out = libusb_alloc_transfer(0)))
 221                 return SR_ERR;
 222
 223         /* Flush anything the F321 still has queued. */
 224         while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
 225                         5) == 0 && buflen > 0)
 226                 ;
 227         ret = SR_OK;
 228
 229         /* Keep a read request waiting in the wings, ready to pounce
 230          * the moment the device sends something. */
 231         libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
 232                         buf, 256, mark_xfer, 0, BULK_XFER_TIMEOUT);
 233         if (libusb_submit_transfer(xfer_in) != 0) {
 234                 ret = SR_ERR;
 235                 goto cleanup;
 236         }
 237
 238         /* Request device configuration structure. */
 239         cmd[0] = 0x01;
 240         cmd[1] = configlen & 0xff;
 241         cmd[2] = (configlen >> 8) & 0xff;
 242         libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
 243                         cmd, 3, mark_xfer, 0, 100);
 244         if (libusb_submit_transfer(xfer_out) != 0) {
 245                 ret = SR_ERR;
 246                 goto cleanup;
 247         }
 248         tv.tv_sec = 0;
 249         tv.tv_usec = 0;
 250         while (!xfer_out->user_data) {
 251                 g_usleep(SLEEP_US_LONG);
 252                 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 253         }
 254
 255         libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
 256                         config, configlen, mark_xfer, 0, 100);
 257         if (libusb_submit_transfer(xfer_out) != 0) {
 258                 ret = SR_ERR;
 259                 goto cleanup;
 260         }
 261         while (!xfer_in->user_data || !xfer_out->user_data) {
 262                 g_usleep(SLEEP_US_LONG);
 263                 libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 264         }
 265
 266         if (xfer_in->actual_length != 1 || buf[0] != 0xff) {
 267                 sr_dbg("unexpected response after transfer");
 268                 ret = SR_ERR;
 269         }
 270
 271 cleanup:
 272         if (!xfer_in->user_data || !xfer_out->user_data) {
 273                 if (!xfer_in->user_data)
 274                         libusb_cancel_transfer(xfer_in);
 275                 if (!xfer_out->user_data)
 276                         libusb_cancel_transfer(xfer_out);
 277                 start = g_get_monotonic_time();
 278                 while (!xfer_in->user_data || !xfer_out->user_data) {
 279                         if (g_get_monotonic_time() - start > EVENTS_TIMEOUT)
 280                                 break;
 281                         g_usleep(SLEEP_US_SHORT);
 282                         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 283                 }
 284         }
 285         libusb_free_transfer(xfer_in);
 286         libusb_free_transfer(xfer_out);
 287
 288         return ret;
 289 }
 290
 291 static struct sr_dev_inst *lascar_identify(unsigned char *config)
 292 {
 293         struct dev_context *devc;
 294         const struct elusb_profile *profile;
 295         struct sr_dev_inst *sdi;
 296         int modelid, i;
 297         char firmware[5];
 298
 299         modelid = config[0];
 300         sdi = NULL;
 301         if (modelid) {
 302                 profile = NULL;
 303                 for (i = 0; profiles[i].modelid; i++) {
 304                         if (profiles[i].modelid == modelid) {
 305                                 profile = &profiles[i];
 306                                 break;
 307                         }
 308                 }
 309                 if (!profile) {
 310                         sr_dbg("unknown EL-USB modelid %d", modelid);
 311                         return NULL;
 312                 }
 313
 314                 i = config[52] | (config[53] << 8);
 315                 memcpy(firmware, config + 0x30, 4);
 316                 firmware[4] = '\0';
 317                 sr_dbg("found %s with firmware version %s serial %d",
 318                                 profile->modelname, firmware, i);
 319
 320                 if (profile->logformat == LOG_UNSUPPORTED) {
 321                         sr_dbg("unsupported EL-USB logformat for %s", profile->modelname);
 322                         return NULL;
 323                 }
 324
 325                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 326                 sdi->status = SR_ST_INACTIVE;
 327                 sdi->vendor = g_strdup(LASCAR_VENDOR);
 328                 sdi->model = g_strdup(profile->modelname);
 329                 sdi->version = g_strdup(firmware);
 330
 331                 if (profile->logformat == LOG_TEMP_RH) {
 332                         /* Model this as two channels: temperature and humidity. */
 333                         sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "Temp");
 334                         sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "Hum");
 335                 } else if (profile->logformat == LOG_CO) {
 336                         sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "CO");
 337                 } else {
 338                         sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
 339                 }
 340
 341                 devc = g_malloc0(sizeof(struct dev_context));
 342                 sdi->priv = devc;
 343                 devc->profile = profile;
 344         }
 345
 346         return sdi;
 347 }
 348
 349 SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address)
 350 {
 351         struct drv_context *drvc;
 352         struct sr_dev_inst *sdi;
 353         struct libusb_device **devlist;
 354         libusb_device_handle *dev_hdl;
 355         int dummy, i;
 356         int ret;
 357         unsigned char config[MAX_CONFIGBLOCK_SIZE];
 358
 359         drvc = di->context;
 360         sdi = NULL;
 361
 362         ret = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 363         if (ret < 0)
 364                 return NULL;
 365
 366         for (i = 0; devlist[i]; i++) {
 367                 if (libusb_get_bus_number(devlist[i]) != bus ||
 368                                 libusb_get_device_address(devlist[i]) != address)
 369                         continue;
 370
 371                 if (!(dev_hdl = lascar_open(devlist[i])))
 372                         continue;
 373
 374                 if (lascar_get_config(dev_hdl, config, &dummy) != SR_OK)
 375                         continue;
 376
 377                 libusb_close(dev_hdl);
 378                 sdi = lascar_identify(config);
 379         }
 380         libusb_free_device_list(devlist, 1);
 381
 382         return sdi;
 383 }
 384
 385 static void lascar_el_usb_dispatch(struct sr_dev_inst *sdi, unsigned char *buf,
 386                 int buflen)
 387 {
 388         struct dev_context *devc;
 389         struct sr_datafeed_packet packet;
 390         struct sr_datafeed_analog_old analog;
 391         struct sr_channel *ch;
 392         float *temp, *rh;
 393         uint16_t s;
 394         int samples, samples_left, i, j;
 395
 396         devc = sdi->priv;
 397
 398         samples = buflen / devc->sample_size;
 399         samples_left = devc->logged_samples - devc->rcvd_samples;
 400         if (samples_left < samples)
 401                 samples = samples_left;
 402         switch (devc->profile->logformat) {
 403         case LOG_TEMP_RH:
 404                 packet.type = SR_DF_ANALOG_OLD;
 405                 packet.payload = &analog;
 406                 analog.mqflags = 0;
 407                 if (!(temp = g_try_malloc(sizeof(float) * samples)))
 408                         break;
 409                 if (!(rh = g_try_malloc(sizeof(float) * samples)))
 410                         break;
 411                 for (i = 0, j = 0; i < samples; i++) {
 412                         /* Both Celsius and Fahrenheit stored at base -40. */
 413                         if (devc->temp_unit == 0)
 414                                 /* Celsius is stored in half-degree increments. */
 415                                 temp[j] = buf[i * 2] / 2 - 40;
 416                         else
 417                                 temp[j] = buf[i * 2] - 40;
 418
 419                         rh[j] = buf[i * 2 + 1] / 2;
 420
 421                         if (temp[j] == 0.0 && rh[j] == 0.0)
 422                                 /* Skip invalid measurement. */
 423                                 continue;
 424                         j++;
 425                 }
 426                 analog.num_samples = j;
 427
 428                 ch = sdi->channels->data;
 429                 if (ch->enabled) {
 430                         analog.channels = g_slist_append(NULL, ch);
 431                         analog.mq = SR_MQ_TEMPERATURE;
 432                         if (devc->temp_unit == 1)
 433                                 analog.unit = SR_UNIT_FAHRENHEIT;
 434                         else
 435                                 analog.unit = SR_UNIT_CELSIUS;
 436                         analog.data = temp;
 437                         sr_session_send(sdi, &packet);
 438                         g_slist_free(analog.channels);
 439                 }
 440
 441                 ch = sdi->channels->next->data;
 442                 if (ch->enabled) {
 443                         analog.channels = g_slist_append(NULL, ch);
 444                         analog.mq = SR_MQ_RELATIVE_HUMIDITY;
 445                         analog.unit = SR_UNIT_PERCENTAGE;
 446                         analog.data = rh;
 447                         sr_session_send(sdi, &packet);
 448                         g_slist_free(analog.channels);
 449                 }
 450
 451                 g_free(temp);
 452                 g_free(rh);
 453                 break;
 454         case LOG_CO:
 455                 packet.type = SR_DF_ANALOG_OLD;
 456                 packet.payload = &analog;
 457                 analog.channels = sdi->channels;
 458                 analog.num_samples = samples;
 459                 analog.mq = SR_MQ_CARBON_MONOXIDE;
 460                 analog.unit = SR_UNIT_CONCENTRATION;
 461                 analog.mqflags = 0;
 462                 if (!(analog.data = g_try_malloc(sizeof(float) * samples)))
 463                         break;
 464                 for (i = 0; i < samples; i++) {
 465                         s = (buf[i * 2] << 8) | buf[i * 2 + 1];
 466                         analog.data[i] = (s * devc->co_high + devc->co_low) / (1000 * 1000);
 467                         if (analog.data[i] < 0.0)
 468                                 analog.data[i] = 0.0;
 469                 }
 470                 sr_session_send(sdi, &packet);
 471                 g_free(analog.data);
 472                 break;
 473         default:
 474                 /* How did we even get this far? */
 475                 break;
 476         }
 477         devc->rcvd_samples += samples;
 478
 479 }
 480
 481 SR_PRIV int lascar_el_usb_handle_events(int fd, int revents, void *cb_data)
 482 {
 483         struct drv_context *drvc = di->context;
 484         struct sr_dev_inst *sdi;
 485         struct timeval tv;
 486
 487         (void)fd;
 488         (void)revents;
 489
 490         sdi = cb_data;
 491
 492         if (sdi->status == SR_ST_STOPPING) {
 493                 usb_source_remove(sdi->session, drvc->sr_ctx);
 494                 std_session_send_df_end(sdi, LOG_PREFIX);
 495         }
 496
 497         memset(&tv, 0, sizeof(struct timeval));
 498         libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
 499                                                NULL);
 500
 501         return TRUE;
 502 }
 503
 504 SR_PRIV void LIBUSB_CALL lascar_el_usb_receive_transfer(struct libusb_transfer *transfer)
 505 {
 506         struct dev_context *devc;
 507         struct sr_dev_inst *sdi;
 508         int ret;
 509         gboolean packet_has_error;
 510
 511         sdi = transfer->user_data;
 512         devc = sdi->priv;
 513
 514         packet_has_error = FALSE;
 515         switch (transfer->status) {
 516         case LIBUSB_TRANSFER_NO_DEVICE:
 517                 /* USB device was unplugged. */
 518                 dev_acquisition_stop(sdi);
 519                 return;
 520         case LIBUSB_TRANSFER_COMPLETED:
 521         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
 522                 break;
 523         default:
 524                 packet_has_error = TRUE;
 525                 break;
 526         }
 527
 528         if (!packet_has_error) {
 529                 if (devc->rcvd_samples < devc->logged_samples)
 530                         lascar_el_usb_dispatch(sdi, transfer->buffer,
 531                                         transfer->actual_length);
 532                 devc->rcvd_bytes += transfer->actual_length;
 533                 sr_spew("received %d/%d bytes (%d/%d samples)",
 534                                 devc->rcvd_bytes, devc->log_size,
 535                                 devc->rcvd_samples, devc->logged_samples);
 536                 if (devc->rcvd_bytes >= devc->log_size)
 537                         dev_acquisition_stop(sdi);
 538         }
 539
 540         if (sdi->status == SR_ST_ACTIVE) {
 541                 /* Send the same request again. */
 542                 if ((ret = libusb_submit_transfer(transfer) != 0)) {
 543                         sr_err("Unable to resubmit transfer: %s.",
 544                                libusb_error_name(ret));
 545                         g_free(transfer->buffer);
 546                         libusb_free_transfer(transfer);
 547                         dev_acquisition_stop(sdi);
 548                 }
 549         } else {
 550                 /* This was the last transfer we're going to receive, so
 551                  * clean up now. */
 552                 g_free(transfer->buffer);
 553                 libusb_free_transfer(transfer);
 554         }
 555
 556 }
 557
 558 static int get_flags(unsigned char *configblock)
 559 {
 560         int flags;
 561
 562         flags = (configblock[32] | (configblock[33] << 8)) & 0x1fff;
 563         sr_spew("Read flags (0x%.4x).", flags);
 564
 565         return flags;
 566 }
 567
 568 static int set_flags(unsigned char *configblock, int flags)
 569 {
 570
 571         sr_spew("Setting flags to 0x%.4x.", flags);
 572         configblock[32] = flags & 0xff;
 573         configblock[33] = (flags >> 8) & 0x1f;
 574
 575         return flags;
 576 }
 577
 578 SR_PRIV int lascar_is_logging(const struct sr_dev_inst *sdi)
 579 {
 580         struct dev_context *devc;
 581         struct sr_usb_dev_inst *usb;
 582         int dummy, flags, ret;
 583
 584         devc = sdi->priv;
 585         usb = sdi->conn;
 586
 587         if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
 588                 return -1;
 589
 590         flags = get_flags(devc->config);
 591         if (flags & 0x0100)
 592                 ret = 1;
 593         else
 594                 ret = 0;
 595
 596         return ret;
 597 }
 598
 599 SR_PRIV int lascar_start_logging(const struct sr_dev_inst *sdi)
 600 {
 601         struct dev_context *devc;
 602         struct sr_usb_dev_inst *usb;
 603         int len, flags, ret;
 604
 605         devc = sdi->priv;
 606         usb = sdi->conn;
 607
 608         if (lascar_get_config(usb->devhdl, devc->config, &len) != SR_OK)
 609                 return SR_ERR;
 610
 611         /* Turn on logging. */
 612         flags = get_flags(devc->config);
 613         flags |= 0x0100;
 614         set_flags(devc->config, flags);
 615
 616         /* Start logging in 0 seconds. */
 617         memset(devc->config + 24, 0, 4);
 618
 619         ret = lascar_save_config(usb->devhdl, devc->config, len);
 620         sr_info("Started internal logging.");
 621
 622         return ret;
 623 }
 624
 625 SR_PRIV int lascar_stop_logging(const struct sr_dev_inst *sdi)
 626 {
 627         struct dev_context *devc;
 628         struct sr_usb_dev_inst *usb;
 629         int len, flags, ret;
 630
 631         devc = sdi->priv;
 632         usb = sdi->conn;
 633
 634         if (lascar_get_config(usb->devhdl, devc->config, &len) != SR_OK)
 635                 return SR_ERR;
 636
 637         flags = get_flags(devc->config);
 638         flags &= ~0x0100;
 639         set_flags(devc->config, flags);
 640
 641         ret = lascar_save_config(usb->devhdl, devc->config, len);
 642         sr_info("Stopped internal logging.");
 643
 644         return ret;
 645 }