src/hardware/kingst-la2016/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2020 Florian Schmidt <schmidt_florian@gmx.de>
   5  * Copyright (C) 2013 Marcus Comstedt <marcus@mc.pp.se>
   6  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   7  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation, either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 /*
  24  * This driver implementation initially was derived from the
  25  * src/hardware/saleae-logic16/ source code.
  26  */
  27
  28 #include <config.h>
  29
  30 #include <libsigrok/libsigrok.h>
  31 #include <string.h>
  32
  33 #include "libsigrok-internal.h"
  34 #include "protocol.h"
  35
  36 static const uint32_t scanopts[] = {
  37         SR_CONF_CONN,
  38 };
  39
  40 static const uint32_t drvopts[] = {
  41         SR_CONF_LOGIC_ANALYZER,
  42 };
  43
  44 static const uint32_t devopts[] = {
  45         /* TODO: SR_CONF_CONTINUOUS, */
  46         SR_CONF_CONN | SR_CONF_GET,
  47         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  48         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_GET | SR_CONF_LIST,
  49         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  50         SR_CONF_LOGIC_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  51         SR_CONF_LOGIC_THRESHOLD_CUSTOM | SR_CONF_GET | SR_CONF_SET,
  52         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  53         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  54 };
  55
  56 static const int32_t trigger_matches[] = {
  57         SR_TRIGGER_ZERO,
  58         SR_TRIGGER_ONE,
  59         SR_TRIGGER_RISING,
  60         SR_TRIGGER_FALLING,
  61 };
  62
  63 static const char *channel_names[] = {
  64         "0", "1", "2", "3", "4", "5", "6", "7",
  65         "8", "9", "10", "11", "12", "13", "14", "15",
  66 };
  67
  68 static const uint64_t samplerates_la2016[] = {
  69         SR_KHZ(20),
  70         SR_KHZ(50),
  71         SR_KHZ(100),
  72         SR_KHZ(200),
  73         SR_KHZ(500),
  74         SR_MHZ(1),
  75         SR_MHZ(2),
  76         SR_MHZ(4),
  77         SR_MHZ(5),
  78         SR_MHZ(8),
  79         SR_MHZ(10),
  80         SR_MHZ(20),
  81         SR_MHZ(50),
  82         SR_MHZ(100),
  83         SR_MHZ(200),
  84 };
  85
  86 static const uint64_t samplerates_la1016[] = {
  87         SR_KHZ(20),
  88         SR_KHZ(50),
  89         SR_KHZ(100),
  90         SR_KHZ(200),
  91         SR_KHZ(500),
  92         SR_MHZ(1),
  93         SR_MHZ(2),
  94         SR_MHZ(4),
  95         SR_MHZ(5),
  96         SR_MHZ(8),
  97         SR_MHZ(10),
  98         SR_MHZ(20),
  99         SR_MHZ(50),
 100         SR_MHZ(100),
 101 };
 102
 103 static const float logic_threshold_value[] = {
 104         1.58,
 105         2.5,
 106         1.165,
 107         1.5,
 108         1.25,
 109         0.9,
 110         0.75,
 111         0.60,
 112         0.45,
 113 };
 114
 115 static const char *logic_threshold[] = {
 116         "TTL 5V",
 117         "CMOS 5V",
 118         "CMOS 3.3V",
 119         "CMOS 3.0V",
 120         "CMOS 2.5V",
 121         "CMOS 1.8V",
 122         "CMOS 1.5V",
 123         "CMOS 1.2V",
 124         "CMOS 0.9V",
 125         "USER",
 126 };
 127
 128 #define MAX_NUM_LOGIC_THRESHOLD_ENTRIES ARRAY_SIZE(logic_threshold)
 129
 130 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 131 {
 132         struct drv_context *drvc;
 133         struct dev_context *devc;
 134         struct sr_dev_inst *sdi;
 135         struct sr_usb_dev_inst *usb;
 136         struct sr_config *src;
 137         GSList *l;
 138         GSList *devices;
 139         GSList *conn_devices;
 140         struct libusb_device_descriptor des;
 141         libusb_device **devlist;
 142         unsigned int i, j;
 143         const char *conn;
 144         char connection_id[64];
 145         uint64_t fw_uploaded;
 146         unsigned int dev_addr;
 147
 148         drvc = di->context;
 149
 150         conn = NULL;
 151         for (l = options; l; l = l->next) {
 152                 src = l->data;
 153                 switch (src->key) {
 154                 case SR_CONF_CONN:
 155                         conn = g_variant_get_string(src->data, NULL);
 156                         break;
 157                 }
 158         }
 159         if (conn)
 160                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 161         else
 162                 conn_devices = NULL;
 163
 164         /* Find all LA2016 devices, optionally upload firmware to them. */
 165         devices = NULL;
 166         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 167         for (i = 0; devlist[i]; i++) {
 168                 if (conn) {
 169                         usb = NULL;
 170                         for (l = conn_devices; l; l = l->next) {
 171                                 usb = l->data;
 172                                 if (usb->bus == libusb_get_bus_number(devlist[i]) &&
 173                                     usb->address == libusb_get_device_address(devlist[i]))
 174                                         break;
 175                         }
 176                         if (!l) {
 177                                 /*
 178                                  * A connection parameter was specified and
 179                                  * this device does not match the filter.
 180                                  */
 181                                 continue;
 182                         }
 183                 }
 184
 185                 libusb_get_device_descriptor(devlist[i], &des);
 186
 187                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 188                         continue;
 189
 190                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID)
 191                         continue;
 192
 193                 /* USB identification matches, a device was found. */
 194                 sr_dbg("Found a LA2016 device.");
 195                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 196                 sdi->status = SR_ST_INITIALIZING;
 197                 sdi->connection_id = g_strdup(connection_id);
 198
 199                 fw_uploaded = 0;
 200                 dev_addr = libusb_get_device_address(devlist[i]);
 201                 if (des.iProduct != 2) {
 202                         sr_info("Device at '%s' has no firmware loaded.", connection_id);
 203
 204                         if (la2016_upload_firmware(drvc->sr_ctx, devlist[i], des.idProduct) != SR_OK) {
 205                                 sr_err("MCU firmware upload failed.");
 206                                 g_free(sdi->connection_id);
 207                                 g_free(sdi);
 208                                 continue;
 209                         }
 210                         fw_uploaded = g_get_monotonic_time();
 211                         /* Will re-enumerate. Mark as "unknown address yet". */
 212                         dev_addr = 0xff;
 213                 }
 214
 215                 sdi->vendor = g_strdup("Kingst");
 216                 sdi->model = g_strdup("LA2016");
 217
 218                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 219                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE, channel_names[j]);
 220
 221                 devices = g_slist_append(devices, sdi);
 222
 223                 devc = g_malloc0(sizeof(struct dev_context));
 224                 sdi->priv = devc;
 225                 devc->fw_uploaded = fw_uploaded;
 226                 devc->threshold_voltage_idx = 0;
 227                 devc->threshold_voltage = logic_threshold_value[devc->threshold_voltage_idx];
 228
 229                 sdi->status = SR_ST_INACTIVE;
 230                 sdi->inst_type = SR_INST_USB;
 231
 232                 sdi->conn = sr_usb_dev_inst_new(
 233                         libusb_get_bus_number(devlist[i]),
 234                         dev_addr, NULL);
 235         }
 236         libusb_free_device_list(devlist, 1);
 237         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 238
 239         return std_scan_complete(di, devices);
 240 }
 241
 242 static int la2016_dev_open(struct sr_dev_inst *sdi)
 243 {
 244         struct sr_dev_driver *di;
 245         libusb_device **devlist;
 246         struct sr_usb_dev_inst *usb;
 247         struct libusb_device_descriptor des;
 248         struct drv_context *drvc;
 249         int ret, i, device_count;
 250         char connection_id[64];
 251
 252         di = sdi->driver;
 253         drvc = di->context;
 254         usb = sdi->conn;
 255         ret = SR_ERR;
 256
 257         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 258         if (device_count < 0) {
 259                 sr_err("Failed to get device list: %s.", libusb_error_name(device_count));
 260                 return SR_ERR;
 261         }
 262
 263         for (i = 0; i < device_count; i++) {
 264                 libusb_get_device_descriptor(devlist[i], &des);
 265
 266                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID || des.iProduct != 2)
 267                         continue;
 268
 269                 if ((sdi->status == SR_ST_INITIALIZING) || (sdi->status == SR_ST_INACTIVE)) {
 270                         /* Check physical USB bus/port address. */
 271                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 272                                 continue;
 273
 274                         if (strcmp(sdi->connection_id, connection_id)) {
 275                                 /* Not the device we looked up before. */
 276                                 continue;
 277                         }
 278                 }
 279
 280                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 281                         if (usb->address == 0xff) {
 282                                 /*
 283                                  * First encounter after firmware upload.
 284                                  * Grab current address after enumeration.
 285                                  */
 286                                 usb->address = libusb_get_device_address(devlist[i]);
 287                         }
 288                 } else {
 289                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
 290                         ret = SR_ERR;
 291                         break;
 292                 }
 293
 294                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 295                 if (ret == LIBUSB_ERROR_BUSY) {
 296                         sr_err("Cannot claim USB interface. Another program or driver using it?");
 297                         ret = SR_ERR;
 298                         break;
 299                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 300                         sr_err("Device has been disconnected.");
 301                         ret = SR_ERR;
 302                         break;
 303                 } else if (ret != 0) {
 304                         sr_err("Cannot claim USB interface: %s.", libusb_error_name(ret));
 305                         ret = SR_ERR;
 306                         break;
 307                 }
 308
 309                 if ((ret = la2016_init_device(sdi)) != SR_OK) {
 310                         sr_err("Cannot initialize device.");
 311                         break;
 312                 }
 313
 314                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 315                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 316
 317                 ret = SR_OK;
 318
 319                 break;
 320         }
 321
 322         libusb_free_device_list(devlist, 1);
 323
 324         if (ret != SR_OK) {
 325                 if (usb->devhdl) {
 326                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 327                         libusb_close(usb->devhdl);
 328                         usb->devhdl = NULL;
 329                 }
 330                 return SR_ERR;
 331         }
 332
 333         return SR_OK;
 334 }
 335
 336 static int dev_open(struct sr_dev_inst *sdi)
 337 {
 338         struct dev_context *devc;
 339         uint64_t reset_done, now, elapsed_ms;
 340         int ret;
 341
 342         devc = sdi->priv;
 343
 344         /*
 345          * When the sigrok driver recently has uploaded MCU firmware,
 346          * then wait for the FX2 to re-enumerate. Allow the USB device
 347          * to vanish before it reappears. Timeouts are rough estimates
 348          * after all, the imprecise time of the last check (potentially
 349          * executes after the total check period) simplifies code paths
 350          * with optional diagnostics. And increases the probability of
 351          * successfully detecting "late/slow" devices.
 352          */
 353         if (devc->fw_uploaded) {
 354                 sr_info("Waiting for device to reset after firmware upload.");
 355                 now = g_get_monotonic_time();
 356                 reset_done = devc->fw_uploaded + RENUM_GONE_DELAY_MS * 1000;
 357                 if (now < reset_done)
 358                         g_usleep(reset_done - now);
 359                 do {
 360                         now = g_get_monotonic_time();
 361                         elapsed_ms = (now - devc->fw_uploaded) / 1000;
 362                         sr_spew("Waited %" PRIu64 "ms.", elapsed_ms);
 363                         ret = la2016_dev_open(sdi);
 364                         if (ret == SR_OK) {
 365                                 devc->fw_uploaded = 0;
 366                                 break;
 367                         }
 368                         g_usleep(RENUM_POLL_INTERVAL_MS * 1000);
 369                 } while (elapsed_ms < RENUM_CHECK_PERIOD_MS);
 370                 if (ret != SR_OK) {
 371                         sr_err("Device failed to re-enumerate.");
 372                         return SR_ERR;
 373                 }
 374                 sr_info("Device came back after %" PRIi64 "ms.", elapsed_ms);
 375         } else {
 376                 ret = la2016_dev_open(sdi);
 377         }
 378
 379         if (ret != SR_OK) {
 380                 sr_err("Cannot open device.");
 381                 return SR_ERR;
 382         }
 383
 384         return SR_OK;
 385 }
 386
 387 static int dev_close(struct sr_dev_inst *sdi)
 388 {
 389         struct sr_usb_dev_inst *usb;
 390
 391         usb = sdi->conn;
 392
 393         if (!usb->devhdl)
 394                 return SR_ERR_BUG;
 395
 396         la2016_deinit_device(sdi);
 397
 398         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 399                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 400         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 401         libusb_close(usb->devhdl);
 402         usb->devhdl = NULL;
 403
 404         return SR_OK;
 405 }
 406
 407 static int config_get(uint32_t key, GVariant **data,
 408         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 409 {
 410         struct dev_context *devc;
 411         struct sr_usb_dev_inst *usb;
 412         double rounded;
 413
 414         (void)cg;
 415
 416         if (!sdi)
 417                 return SR_ERR_ARG;
 418         devc = sdi->priv;
 419
 420         switch (key) {
 421         case SR_CONF_CONN:
 422                 if (!sdi->conn)
 423                         return SR_ERR_ARG;
 424                 usb = sdi->conn;
 425                 if (usb->address == 0xff) {
 426                         /*
 427                          * Device still needs to re-enumerate after firmware
 428                          * upload, so we don't know its (future) address.
 429                          */
 430                         return SR_ERR;
 431                 }
 432                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 433                 break;
 434         case SR_CONF_SAMPLERATE:
 435                 *data = g_variant_new_uint64(devc->cur_samplerate);
 436                 break;
 437         case SR_CONF_LIMIT_SAMPLES:
 438                 *data = g_variant_new_uint64(devc->limit_samples);
 439                 break;
 440         case SR_CONF_CAPTURE_RATIO:
 441                 *data = g_variant_new_uint64(devc->capture_ratio);
 442                 break;
 443         case SR_CONF_VOLTAGE_THRESHOLD:
 444                 rounded = (int)(devc->threshold_voltage / 0.1) * 0.1;
 445                 *data = std_gvar_tuple_double(rounded, rounded + 0.1);
 446                 return SR_OK;
 447         case SR_CONF_LOGIC_THRESHOLD:
 448                 *data = g_variant_new_string(logic_threshold[devc->threshold_voltage_idx]);
 449                 break;
 450         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
 451                 *data = g_variant_new_double(devc->threshold_voltage);
 452                 break;
 453
 454         default:
 455                 return SR_ERR_NA;
 456         }
 457
 458         return SR_OK;
 459 }
 460
 461 static int config_set(uint32_t key, GVariant *data,
 462         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 463 {
 464         struct dev_context *devc;
 465         double low, high;
 466         int idx;
 467
 468         (void)cg;
 469
 470         devc = sdi->priv;
 471
 472         switch (key) {
 473         case SR_CONF_SAMPLERATE:
 474                 devc->cur_samplerate = g_variant_get_uint64(data);
 475                 break;
 476         case SR_CONF_LIMIT_SAMPLES:
 477                 devc->limit_samples = g_variant_get_uint64(data);
 478                 break;
 479         case SR_CONF_CAPTURE_RATIO:
 480                 devc->capture_ratio = g_variant_get_uint64(data);
 481                 break;
 482         case SR_CONF_VOLTAGE_THRESHOLD:
 483                 g_variant_get(data, "(dd)", &low, &high);
 484                 devc->threshold_voltage = (low + high) / 2.0;
 485                 devc->threshold_voltage_idx = MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1; /* USER */
 486                 break;
 487         case SR_CONF_LOGIC_THRESHOLD: {
 488                 if ((idx = std_str_idx(data, logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES)) < 0)
 489                         return SR_ERR_ARG;
 490                 if (idx == MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1) {
 491                         /* user threshold */
 492                 } else {
 493                         devc->threshold_voltage = logic_threshold_value[idx];
 494                 }
 495                 devc->threshold_voltage_idx = idx;
 496                 break;
 497         }
 498         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
 499                 devc->threshold_voltage = g_variant_get_double(data);
 500                 break;
 501         default:
 502                 return SR_ERR_NA;
 503         }
 504
 505         return SR_OK;
 506 }
 507
 508 static int config_list(uint32_t key, GVariant **data,
 509         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 510 {
 511         struct dev_context *devc;
 512
 513         switch (key) {
 514         case SR_CONF_SCAN_OPTIONS:
 515         case SR_CONF_DEVICE_OPTIONS:
 516                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 517         case SR_CONF_SAMPLERATE:
 518                 if (!sdi)
 519                         return SR_ERR_ARG;
 520                 devc = sdi->priv;
 521                 if (devc->max_samplerate == SR_MHZ(200)) {
 522                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates_la2016));
 523                 } else {
 524                         *data = std_gvar_samplerates(ARRAY_AND_SIZE(samplerates_la1016));
 525                 }
 526                 break;
 527         case SR_CONF_LIMIT_SAMPLES:
 528                 *data = std_gvar_tuple_u64(LA2016_NUM_SAMPLES_MIN, LA2016_NUM_SAMPLES_MAX);
 529                 break;
 530         case SR_CONF_VOLTAGE_THRESHOLD:
 531                 *data = std_gvar_min_max_step_thresholds(
 532                         LA2016_THR_VOLTAGE_MIN,
 533                         LA2016_THR_VOLTAGE_MAX, 0.1);
 534                 break;
 535         case SR_CONF_TRIGGER_MATCH:
 536                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 537                 break;
 538         case SR_CONF_LOGIC_THRESHOLD:
 539                 *data = g_variant_new_strv(logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES);
 540                 break;
 541         default:
 542                 return SR_ERR_NA;
 543         }
 544
 545         return SR_OK;
 546 }
 547
 548 static int configure_channels(const struct sr_dev_inst *sdi)
 549 {
 550         struct dev_context *devc;
 551
 552         devc = sdi->priv;
 553         devc->cur_channels = 0;
 554         devc->num_channels = 0;
 555
 556         for (GSList *l = sdi->channels; l; l = l->next) {
 557                 struct sr_channel *ch = (struct sr_channel*)l->data;
 558                 if (ch->enabled == FALSE)
 559                         continue;
 560                 devc->cur_channels |= 1 << ch->index;
 561                 devc->num_channels++;
 562         }
 563
 564         return SR_OK;
 565 }
 566
 567 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 568 {
 569         struct sr_dev_driver *di;
 570         struct drv_context *drvc;
 571         struct dev_context *devc;
 572         int ret;
 573
 574         di = sdi->driver;
 575         drvc = di->context;
 576         devc = sdi->priv;
 577
 578         if (configure_channels(sdi) != SR_OK) {
 579                 sr_err("Cannot configure channels.");
 580                 return SR_ERR;
 581         }
 582
 583         devc->convbuffer_size = 4 * 1024 * 1024;
 584         if (!(devc->convbuffer = g_try_malloc(devc->convbuffer_size))) {
 585                 sr_err("Cannot allocate conversion buffer.");
 586                 return SR_ERR_MALLOC;
 587         }
 588
 589         if ((ret = la2016_setup_acquisition(sdi)) != SR_OK) {
 590                 g_free(devc->convbuffer);
 591                 devc->convbuffer = NULL;
 592                 return ret;
 593         }
 594
 595         devc->ctx = drvc->sr_ctx;
 596
 597         if ((ret = la2016_start_acquisition(sdi)) != SR_OK) {
 598                 la2016_abort_acquisition(sdi);
 599                 return ret;
 600         }
 601
 602         devc->have_trigger = 0;
 603         usb_source_add(sdi->session, drvc->sr_ctx, 50,
 604                 la2016_receive_data, (void *)sdi);
 605
 606         std_session_send_df_header(sdi);
 607
 608         return SR_OK;
 609 }
 610
 611 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 612 {
 613         int ret;
 614
 615         ret = la2016_abort_acquisition(sdi);
 616
 617         return ret;
 618 }
 619
 620 static struct sr_dev_driver kingst_la2016_driver_info = {
 621         .name = "kingst-la2016",
 622         .longname = "Kingst LA2016",
 623         .api_version = 1,
 624         .init = std_init,
 625         .cleanup = std_cleanup,
 626         .scan = scan,
 627         .dev_list = std_dev_list,
 628         .dev_clear = std_dev_clear,
 629         .config_get = config_get,
 630         .config_set = config_set,
 631         .config_list = config_list,
 632         .dev_open = dev_open,
 633         .dev_close = dev_close,
 634         .dev_acquisition_start = dev_acquisition_start,
 635         .dev_acquisition_stop = dev_acquisition_stop,
 636         .context = NULL,
 637 };
 638 SR_REGISTER_DEV_DRIVER(kingst_la2016_driver_info);