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 /* mostly stolen from src/hardware/saleae-logic16/ */
  24
  25 #include <config.h>
  26 #include <glib.h>
  27 #include <libusb.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <math.h>
  31 #include <libsigrok/libsigrok.h>
  32 #include "libsigrok-internal.h"
  33 #include "protocol.h"
  34
  35 static const uint32_t scanopts[] = {
  36         SR_CONF_CONN,
  37 };
  38
  39 static const uint32_t drvopts[] = {
  40         SR_CONF_LOGIC_ANALYZER,
  41 };
  42
  43 static const uint32_t devopts[] = {
  44         /* TODO: SR_CONF_CONTINUOUS, */
  45         SR_CONF_CONN | SR_CONF_GET,
  46         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  47         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET | SR_CONF_GET | SR_CONF_LIST,
  48         SR_CONF_VOLTAGE_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  49         SR_CONF_LOGIC_THRESHOLD | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  50         SR_CONF_LOGIC_THRESHOLD_CUSTOM | SR_CONF_GET | SR_CONF_SET,
  51         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  52         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  53 };
  54
  55 static const int32_t trigger_matches[] = {
  56         SR_TRIGGER_ZERO,
  57         SR_TRIGGER_ONE,
  58         SR_TRIGGER_RISING,
  59         SR_TRIGGER_FALLING,
  60 };
  61
  62 static const char *channel_names[] = {
  63         "0", "1", "2", "3", "4", "5", "6", "7", "8",
  64         "9", "10", "11", "12", "13", "14", "15",
  65 };
  66
  67 static const uint64_t samplerates[] = {
  68         SR_KHZ(20),
  69         SR_KHZ(50),
  70         SR_KHZ(100),
  71         SR_KHZ(200),
  72         SR_KHZ(500),
  73         SR_MHZ(1),
  74         SR_MHZ(2),
  75         SR_MHZ(4),
  76         SR_MHZ(5),
  77         SR_MHZ(8),
  78         SR_MHZ(10),
  79         SR_MHZ(20),
  80         SR_MHZ(50),
  81         SR_MHZ(100),
  82         SR_MHZ(200),
  83 };
  84
  85 static const float logic_threshold_value[] = {
  86         1.58,
  87         2.5,
  88         1.165,
  89         1.5,
  90         1.25,
  91         0.9,
  92         0.75,
  93         0.60,
  94         0.45,
  95 };
  96
  97 static const char *logic_threshold[] = {
  98         "TTL 5V",
  99         "CMOS 5V",
 100         "CMOS 3.3V",
 101         "CMOS 3.0V",
 102         "CMOS 2.5V",
 103         "CMOS 1.8V",
 104         "CMOS 1.5V",
 105         "CMOS 1.2V",
 106         "CMOS 0.9V",
 107         "USER",
 108 };
 109
 110 #define MAX_NUM_LOGIC_THRESHOLD_ENTRIES ARRAY_SIZE(logic_threshold)
 111
 112 #define array_length(a) (sizeof(a) / sizeof((a)[0]))
 113
 114 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 115 {
 116         struct drv_context *drvc;
 117         struct dev_context *devc;
 118         struct sr_dev_inst *sdi;
 119         struct sr_usb_dev_inst *usb;
 120         struct sr_config *src;
 121         GSList *l;
 122         GSList *devices;
 123         GSList *conn_devices;
 124         struct libusb_device_descriptor des;
 125         libusb_device **devlist;
 126         unsigned int i, j;
 127         const char *conn;
 128         char connection_id[64];
 129         int64_t fw_updated;
 130         unsigned int dev_addr;
 131
 132         drvc = di->context;
 133
 134         conn = NULL;
 135         for (l = options; l; l = l->next) {
 136                 src = l->data;
 137                 switch (src->key) {
 138                 case SR_CONF_CONN:
 139                         conn = g_variant_get_string(src->data, NULL);
 140                         break;
 141                 }
 142         }
 143         if (conn)
 144                 conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 145         else
 146                 conn_devices = NULL;
 147
 148         /* Find all LA2016 devices and upload firmware to them. */
 149         devices = NULL;
 150         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 151         for (i = 0; devlist[i]; i++) {
 152                 if (conn) {
 153                         usb = NULL;
 154                         for (l = conn_devices; l; l = l->next) {
 155                                 usb = l->data;
 156                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 157                                     && usb->address == libusb_get_device_address(devlist[i]))
 158                                         break;
 159                         }
 160                         if (!l)
 161                                 /* This device matched none of the ones that
 162                                  * matched the conn specification. */
 163                                 continue;
 164                 }
 165
 166                 libusb_get_device_descriptor(devlist[i], &des);
 167
 168                 if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 169                         continue;
 170
 171                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID)
 172                         continue;
 173
 174                 /* Already has the firmware */
 175                 sr_dbg("Found a LA2016 device.");
 176                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 177                 sdi->status = SR_ST_INITIALIZING;
 178                 sdi->connection_id = g_strdup(connection_id);
 179
 180                 fw_updated = 0;
 181                 dev_addr = libusb_get_device_address(devlist[i]);
 182                 if (des.iProduct != 2) {
 183                         sr_info("device at '%s' has no firmware loaded!", connection_id);
 184
 185                         if (la2016_upload_firmware(drvc->sr_ctx, devlist[i], des.idProduct) != SR_OK) {
 186                                 sr_err("uC firmware upload failed!");
 187                                 g_free(sdi->connection_id);
 188                                 g_free(sdi);
 189                                 continue;
 190                         }
 191                         fw_updated = g_get_monotonic_time();
 192                         dev_addr = 0xff; /* to mark that we don't know address yet... ugly */
 193                 }
 194
 195                 sdi->vendor = g_strdup("Kingst");
 196                 sdi->model = g_strdup("LA2016");
 197
 198                 for (j = 0; j < ARRAY_SIZE(channel_names); j++)
 199                         sr_channel_new(sdi, j, SR_CHANNEL_LOGIC, TRUE, channel_names[j]);
 200
 201                 devices = g_slist_append(devices, sdi);
 202
 203                 devc = g_malloc0(sizeof(struct dev_context));
 204                 sdi->priv = devc;
 205                 devc->fw_updated = fw_updated;
 206                 devc->threshold_voltage_idx = 0;
 207                 devc->threshold_voltage = logic_threshold_value[devc->threshold_voltage_idx];
 208
 209                 sdi->status = SR_ST_INACTIVE;
 210                 sdi->inst_type = SR_INST_USB;
 211
 212                 sdi->conn = sr_usb_dev_inst_new(
 213                         libusb_get_bus_number(devlist[i]),
 214                         dev_addr, NULL);
 215         }
 216         libusb_free_device_list(devlist, 1);
 217         g_slist_free_full(conn_devices, (GDestroyNotify)sr_usb_dev_inst_free);
 218
 219         return std_scan_complete(di, devices);
 220 }
 221
 222 static int la2016_dev_open(struct sr_dev_inst *sdi)
 223 {
 224         struct sr_dev_driver *di;
 225         libusb_device **devlist;
 226         struct sr_usb_dev_inst *usb;
 227         struct libusb_device_descriptor des;
 228         struct drv_context *drvc;
 229         int ret, i, device_count;
 230         char connection_id[64];
 231
 232         di = sdi->driver;
 233         drvc = di->context;
 234         usb = sdi->conn;
 235         ret = SR_ERR;
 236
 237         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 238         if (device_count < 0) {
 239                 sr_err("Failed to get device list: %s.", libusb_error_name(device_count));
 240                 return SR_ERR;
 241         }
 242
 243         for (i = 0; i < device_count; i++) {
 244                 libusb_get_device_descriptor(devlist[i], &des);
 245
 246                 if (des.idVendor != LA2016_VID || des.idProduct != LA2016_PID || des.iProduct != 2)
 247                         continue;
 248
 249                 if ((sdi->status == SR_ST_INITIALIZING) || (sdi->status == SR_ST_INACTIVE)) {
 250                         /*
 251                          * Check device by its physical USB bus/port address.
 252                          */
 253                         if (usb_get_port_path(devlist[i], connection_id, sizeof(connection_id)) < 0)
 254                                 continue;
 255
 256                         if (strcmp(sdi->connection_id, connection_id))
 257                                 /* This is not the one. */
 258                                 continue;
 259                 }
 260
 261                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 262                         if (usb->address == 0xff)
 263                                 /*
 264                                  * First time we touch this device after FW
 265                                  * upload, so we don't know the address yet.
 266                                  */
 267                                 usb->address = libusb_get_device_address(devlist[i]);
 268                 } else {
 269                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
 270                         ret = SR_ERR;
 271                         break;
 272                 }
 273
 274                 ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
 275                 if (ret == LIBUSB_ERROR_BUSY) {
 276                         sr_err("Unable to claim USB interface. Another "
 277                                "program or driver has already claimed it.");
 278                         ret = SR_ERR;
 279                         break;
 280                 } else if (ret == LIBUSB_ERROR_NO_DEVICE) {
 281                         sr_err("Device has been disconnected.");
 282                         ret = SR_ERR;
 283                         break;
 284                 } else if (ret != 0) {
 285                         sr_err("Unable to claim interface: %s.", libusb_error_name(ret));
 286                         ret = SR_ERR;
 287                         break;
 288                 }
 289
 290                 if ((ret = la2016_init_device(sdi)) != SR_OK) {
 291                         sr_err("Failed to init device.");
 292                         break;
 293                 }
 294
 295                 sr_info("Opened device on %d.%d (logical) / %s (physical), interface %d.",
 296                         usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 297
 298                 ret = SR_OK;
 299
 300                 break;
 301         }
 302
 303         libusb_free_device_list(devlist, 1);
 304
 305         if (ret != SR_OK) {
 306                 if (usb->devhdl) {
 307                         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 308                         libusb_close(usb->devhdl);
 309                         usb->devhdl = NULL;
 310                 }
 311                 return SR_ERR;
 312         }
 313
 314         return SR_OK;
 315 }
 316
 317 static int dev_open(struct sr_dev_inst *sdi)
 318 {
 319         struct dev_context *devc;
 320         int64_t timediff_us, timediff_ms;
 321         uint64_t reset_done;
 322         uint64_t now;
 323         int ret;
 324
 325         devc = sdi->priv;
 326
 327         /*
 328          * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 329          * milliseconds for the FX2 to renumerate.
 330          */
 331         ret = SR_ERR;
 332         if (devc->fw_updated > 0) {
 333                 sr_info("Waiting for device to reset after firmware upload.");
 334                 /* Takes >= 2000ms for the uC to be gone from the USB bus. */
 335                 reset_done = devc->fw_updated + 18 * (uint64_t)1e5; /* 1.8 seconds */
 336                 now = g_get_monotonic_time();
 337                 if (reset_done > now)
 338                         g_usleep(reset_done - now);
 339                 timediff_ms = 0;
 340                 while (timediff_ms < MAX_RENUM_DELAY_MS) {
 341                         g_usleep(200 * 1000);
 342
 343                         timediff_us = g_get_monotonic_time() - devc->fw_updated;
 344                         timediff_ms = timediff_us / 1000;
 345
 346                         if ((ret = la2016_dev_open(sdi)) == SR_OK)
 347                                 break;
 348                         sr_spew("Waited %" PRIi64 "ms.", timediff_ms);
 349                 }
 350                 if (ret != SR_OK) {
 351                         sr_err("Device failed to re-enumerate.");
 352                         return SR_ERR;
 353                 }
 354                 sr_info("Device came back after %" PRIi64 "ms.", timediff_ms);
 355         } else
 356                 ret = la2016_dev_open(sdi);
 357
 358         if (ret != SR_OK) {
 359                 sr_err("Unable to open device.");
 360                 return SR_ERR;
 361         }
 362
 363         return SR_OK;
 364 }
 365
 366 static int dev_close(struct sr_dev_inst *sdi)
 367 {
 368         struct sr_usb_dev_inst *usb;
 369
 370         usb = sdi->conn;
 371
 372         if (!usb->devhdl)
 373                 return SR_ERR_BUG;
 374
 375         la2016_deinit_device(sdi);
 376
 377         sr_info("Closing device on %d.%d (logical) / %s (physical) interface %d.",
 378                 usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 379         libusb_release_interface(usb->devhdl, USB_INTERFACE);
 380         libusb_close(usb->devhdl);
 381         usb->devhdl = NULL;
 382
 383         return SR_OK;
 384 }
 385
 386 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 387 {
 388         struct dev_context *devc;
 389         struct sr_usb_dev_inst *usb;
 390         double rounded;
 391
 392         (void)cg;
 393
 394         if (!sdi)
 395                 return SR_ERR_ARG;
 396         devc = sdi->priv;
 397
 398         switch (key) {
 399         case SR_CONF_CONN:
 400                 if (!sdi->conn)
 401                         return SR_ERR_ARG;
 402                 usb = sdi->conn;
 403                 if (usb->address == 255)
 404                         /* Device still needs to re-enumerate after firmware
 405                          * upload, so we don't know its (future) address. */
 406                         return SR_ERR;
 407                 *data = g_variant_new_printf("%d.%d", usb->bus, usb->address);
 408                 break;
 409         case SR_CONF_SAMPLERATE:
 410                 *data = g_variant_new_uint64(devc->cur_samplerate);
 411                 break;
 412         case SR_CONF_LIMIT_SAMPLES:
 413                 *data = g_variant_new_uint64(devc->limit_samples);
 414                 break;
 415         case SR_CONF_CAPTURE_RATIO:
 416                 *data = g_variant_new_uint64(devc->capture_ratio);
 417                 break;
 418         case SR_CONF_VOLTAGE_THRESHOLD:
 419                 rounded = (int)(devc->threshold_voltage / 0.1) * 0.1;
 420                 *data = std_gvar_tuple_double(rounded, rounded + 0.1);
 421                 return SR_OK;
 422         case SR_CONF_LOGIC_THRESHOLD:
 423                 *data = g_variant_new_string(logic_threshold[devc->threshold_voltage_idx]);
 424                 break;
 425         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
 426                 *data = g_variant_new_double(devc->threshold_voltage);
 427                 break;
 428
 429         default:
 430                 return SR_ERR_NA;
 431         }
 432
 433         return SR_OK;
 434 }
 435
 436 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 437 {
 438         struct dev_context *devc;
 439         double low, high;
 440         int idx;
 441
 442         (void)cg;
 443
 444         devc = sdi->priv;
 445
 446         switch (key) {
 447         case SR_CONF_SAMPLERATE:
 448                 devc->cur_samplerate = g_variant_get_uint64(data);
 449                 break;
 450         case SR_CONF_LIMIT_SAMPLES:
 451                 devc->limit_samples = g_variant_get_uint64(data);
 452                 break;
 453         case SR_CONF_CAPTURE_RATIO:
 454                 devc->capture_ratio = g_variant_get_uint64(data);
 455                 break;
 456         case SR_CONF_VOLTAGE_THRESHOLD:
 457                 g_variant_get(data, "(dd)", &low, &high);
 458                 devc->threshold_voltage = (low + high) / 2.0;
 459                 devc->threshold_voltage_idx = MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1; /* USER */
 460                 break;
 461         case SR_CONF_LOGIC_THRESHOLD: {
 462                 if ((idx = std_str_idx(data, logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES)) < 0)
 463                         return SR_ERR_ARG;
 464                 if (idx == MAX_NUM_LOGIC_THRESHOLD_ENTRIES - 1) {
 465                         /* user threshold */
 466                 } else {
 467                         devc->threshold_voltage = logic_threshold_value[idx];
 468                 }
 469                 devc->threshold_voltage_idx = idx;
 470                 break;
 471         }
 472         case SR_CONF_LOGIC_THRESHOLD_CUSTOM:
 473                 devc->threshold_voltage = g_variant_get_double(data);
 474                 break;
 475         default:
 476                 return SR_ERR_NA;
 477         }
 478
 479         return SR_OK;
 480 }
 481
 482 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 483 {
 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         case SR_CONF_LIMIT_SAMPLES:
 492                 *data = std_gvar_tuple_u64(LA2016_NUM_SAMPLES_MIN, LA2016_NUM_SAMPLES_MAX);
 493                 break;
 494         case SR_CONF_VOLTAGE_THRESHOLD:
 495                 *data = std_gvar_min_max_step_thresholds(
 496                         LA2016_THR_VOLTAGE_MIN,
 497                         LA2016_THR_VOLTAGE_MAX, 0.1);
 498                 break;
 499         case SR_CONF_TRIGGER_MATCH:
 500                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 501                 break;
 502         case SR_CONF_LOGIC_THRESHOLD:
 503                 *data = g_variant_new_strv(logic_threshold, MAX_NUM_LOGIC_THRESHOLD_ENTRIES);
 504                 break;
 505         default:
 506                 return SR_ERR_NA;
 507         }
 508
 509         return SR_OK;
 510 }
 511
 512 static void send_chunk(struct sr_dev_inst *sdi, transfer_packet_t *packets, unsigned int num_tfers)
 513 {
 514         struct dev_context *devc;
 515         struct sr_datafeed_logic logic;
 516         struct sr_datafeed_packet sr_packet;
 517         transfer_packet_t *packet;
 518         acq_packet_t *p;
 519         unsigned int max_samples, n_samples, total_samples, free_n_samples, ptotal;
 520         unsigned int i, j, k;
 521         int do_signal_trigger;
 522         uint16_t *wp;
 523
 524         devc = sdi->priv;
 525
 526         logic.unitsize = 2;
 527         logic.data = devc->convbuffer;
 528
 529         sr_packet.type = SR_DF_LOGIC;
 530         sr_packet.payload = &logic;
 531
 532         max_samples = devc->convbuffer_size / 2;
 533         n_samples = 0;
 534         wp = (uint16_t*)devc->convbuffer;
 535         total_samples = 0;
 536         do_signal_trigger = 0;
 537
 538         if (devc->had_triggers_configured && devc->reading_behind_trigger == 0 && devc->info.n_rep_packets_before_trigger == 0) {
 539                 sr_packet.type = SR_DF_TRIGGER;
 540                 sr_packet.payload = NULL;
 541                 sr_session_send(sdi, &sr_packet);
 542                 devc->reading_behind_trigger = 1;
 543
 544                 do_signal_trigger = 0;
 545                 sr_packet.type = SR_DF_LOGIC;
 546                 sr_packet.payload = &logic;
 547         }
 548
 549         for (i = 0; i < num_tfers; i++) {
 550                 transfer_packet_host(packets[i]);
 551                 packet = packets + i;
 552                 ptotal = 0;
 553                 for (k = 0; k < array_length(packet->packet); k++) {
 554                         free_n_samples = max_samples - n_samples;
 555                         if (free_n_samples < 256 || do_signal_trigger) {
 556                                 logic.length = n_samples * 2;
 557                                 sr_session_send(sdi, &sr_packet);
 558                                 n_samples = 0;
 559                                 wp = (uint16_t*)devc->convbuffer;
 560                                 if (do_signal_trigger) {
 561                                         sr_packet.type = SR_DF_TRIGGER;
 562                                         sr_packet.payload = NULL;
 563                                         sr_session_send(sdi, &sr_packet);
 564
 565                                         do_signal_trigger = 0;
 566                                         sr_packet.type = SR_DF_LOGIC;
 567                                         sr_packet.payload = &logic;
 568                                 }
 569                         }
 570                         p = packet->packet + k;
 571                         for (j = 0; j < p->repetitions; j++)
 572                                 *(wp++) = p->state;
 573                         n_samples += p->repetitions;
 574                         total_samples += p->repetitions;
 575                         ptotal += p->repetitions;
 576                         devc->total_samples += p->repetitions;
 577                         if (!devc->reading_behind_trigger) {
 578                                 devc->n_reps_until_trigger --;
 579                                 if (devc->n_reps_until_trigger == 0) {
 580                                         devc->reading_behind_trigger = 1;
 581                                         do_signal_trigger = 1;
 582                                         sr_dbg("  here is trigger position after %" PRIu64 " samples, %.6fms",
 583                                                devc->total_samples,
 584                                                (double)devc->total_samples / devc->cur_samplerate * 1e3);
 585                                 }
 586                         }
 587                 }
 588         }
 589         if (n_samples) {
 590                 logic.length = n_samples * 2;
 591                 sr_session_send(sdi, &sr_packet);
 592                 if (do_signal_trigger) {
 593                         sr_packet.type = SR_DF_TRIGGER;
 594                         sr_packet.payload = NULL;
 595                         sr_session_send(sdi, &sr_packet);
 596                 }
 597         }
 598         sr_dbg("send_chunk done after %d samples", total_samples);
 599 }
 600
 601 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 602 {
 603         struct sr_dev_inst *sdi;
 604         struct dev_context *devc;
 605         struct sr_usb_dev_inst *usb;
 606         int ret;
 607
 608         sdi = transfer->user_data;
 609         devc = sdi->priv;
 610         usb = sdi->conn;
 611
 612         sr_dbg("receive_transfer(): status %s received %d bytes.",
 613                libusb_error_name(transfer->status), transfer->actual_length);
 614
 615         if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT) {
 616                 sr_err("bulk transfer timeout!");
 617                 devc->transfer_finished = 1;
 618         }
 619         send_chunk(sdi, (transfer_packet_t*)transfer->buffer, transfer->actual_length / sizeof(transfer_packet_t));
 620
 621         devc->n_bytes_to_read -= transfer->actual_length;
 622         if (devc->n_bytes_to_read) {
 623                 uint32_t to_read = devc->n_bytes_to_read;
 624                 if (to_read > LA2016_BULK_MAX)
 625                         to_read = LA2016_BULK_MAX;
 626                 libusb_fill_bulk_transfer(
 627                         transfer, usb->devhdl,
 628                         0x86, transfer->buffer, to_read,
 629                         receive_transfer, (void*)sdi, DEFAULT_TIMEOUT_MS);
 630
 631                 if ((ret = libusb_submit_transfer(transfer)) == 0)
 632                         return;
 633                 sr_err("Failed to submit further transfer: %s.", libusb_error_name(ret));
 634         }
 635
 636         g_free(transfer->buffer);
 637         libusb_free_transfer(transfer);
 638         devc->transfer_finished = 1;
 639 }
 640
 641 static int handle_event(int fd, int revents, void *cb_data)
 642 {
 643         const struct sr_dev_inst *sdi;
 644         struct dev_context *devc;
 645         struct drv_context *drvc;
 646         struct sr_datafeed_packet packet;
 647         struct timeval tv;
 648
 649         (void)fd;
 650         (void)revents;
 651
 652         sdi = cb_data;
 653         devc = sdi->priv;
 654         drvc = sdi->driver->context;
 655
 656         if (devc->have_trigger == 0) {
 657                 if (la2016_has_triggered(sdi) == 0) {
 658                         sr_dbg("not yet ready for download...");
 659                         return TRUE;
 660                 }
 661                 devc->have_trigger = 1;
 662                 devc->transfer_finished = 0;
 663                 devc->reading_behind_trigger = 0;
 664                 devc->total_samples = 0;
 665                 /* we can start retrieving data! */
 666                 if (la2016_start_retrieval(sdi, receive_transfer) != SR_OK) {
 667                         sr_err("failed to start retrieval!");
 668                         return FALSE;
 669                 }
 670                 sr_dbg("retrieval is started...");
 671                 packet.type = SR_DF_FRAME_BEGIN;
 672                 sr_session_send(sdi, &packet);
 673
 674                 return TRUE;
 675         }
 676
 677         tv.tv_sec = tv.tv_usec = 0;
 678         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 679
 680         if (devc->transfer_finished) {
 681                 sr_dbg("transfer is finished!");
 682                 packet.type = SR_DF_FRAME_END;
 683                 sr_session_send(sdi, &packet);
 684
 685                 usb_source_remove(sdi->session, drvc->sr_ctx);
 686                 std_session_send_df_end(sdi);
 687
 688                 la2016_stop_acquisition(sdi);
 689
 690                 g_free(devc->convbuffer);
 691                 devc->convbuffer = NULL;
 692
 693                 sr_dbg("transfer is now finished");
 694         }
 695
 696         return TRUE;
 697 }
 698
 699 static void abort_acquisition(struct dev_context *devc)
 700 {
 701         if (devc->transfer)
 702                 libusb_cancel_transfer(devc->transfer);
 703 }
 704
 705 static int configure_channels(const struct sr_dev_inst *sdi)
 706 {
 707         struct dev_context *devc;
 708
 709         devc = sdi->priv;
 710         devc->cur_channels = 0;
 711         devc->num_channels = 0;
 712
 713         for (GSList *l = sdi->channels; l; l = l->next) {
 714                 struct sr_channel *ch = (struct sr_channel*)l->data;
 715                 if (ch->enabled == FALSE)
 716                         continue;
 717                 devc->cur_channels |= 1 << (ch->index);
 718                 devc->num_channels++;
 719         }
 720
 721         return SR_OK;
 722 }
 723
 724 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 725 {
 726         struct sr_dev_driver *di;
 727         struct drv_context *drvc;
 728         struct dev_context *devc;
 729         int ret;
 730
 731         di = sdi->driver;
 732         drvc = di->context;
 733         devc = sdi->priv;
 734
 735         if (configure_channels(sdi) != SR_OK) {
 736                 sr_err("Failed to configure channels.");
 737                 return SR_ERR;
 738         }
 739
 740         devc->convbuffer_size = 4 * 1024 * 1024;
 741         if (!(devc->convbuffer = g_try_malloc(devc->convbuffer_size))) {
 742                 sr_err("Conversion buffer malloc failed.");
 743                 return SR_ERR_MALLOC;
 744         }
 745
 746         if ((ret = la2016_setup_acquisition(sdi)) != SR_OK) {
 747                 g_free(devc->convbuffer);
 748                 devc->convbuffer = NULL;
 749                 return ret;
 750         }
 751
 752         devc->ctx = drvc->sr_ctx;
 753
 754         if ((ret = la2016_start_acquisition(sdi)) != SR_OK) {
 755                 abort_acquisition(devc);
 756                 return ret;
 757         }
 758
 759         devc->have_trigger = 0;
 760         usb_source_add(sdi->session, drvc->sr_ctx, 50, handle_event, (void*)sdi);
 761
 762         std_session_send_df_header(sdi);
 763
 764         return SR_OK;
 765 }
 766
 767 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 768 {
 769         int ret;
 770
 771         ret = la2016_abort_acquisition(sdi);
 772         abort_acquisition(sdi->priv);
 773
 774         return ret;
 775 }
 776
 777 static struct sr_dev_driver kingst_la2016_driver_info = {
 778         .name = "kingst-la2016",
 779         .longname = "Kingst LA2016",
 780         .api_version = 1,
 781         .init = std_init,
 782         .cleanup = std_cleanup,
 783         .scan = scan,
 784         .dev_list = std_dev_list,
 785         .dev_clear = std_dev_clear,
 786         .config_get = config_get,
 787         .config_set = config_set,
 788         .config_list = config_list,
 789         .dev_open = dev_open,
 790         .dev_close = dev_close,
 791         .dev_acquisition_start = dev_acquisition_start,
 792         .dev_acquisition_stop = dev_acquisition_stop,
 793         .context = NULL,
 794 };
 795 SR_REGISTER_DEV_DRIVER(kingst_la2016_driver_info);