hardware/openbench-logic-sniffer/ols.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2010-2012 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 <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #ifdef _WIN32
  28 #include <windows.h>
  29 #else
  30 #include <termios.h>
  31 #endif
  32 #include <string.h>
  33 #include <sys/time.h>
  34 #include <inttypes.h>
  35 #ifdef _WIN32
  36 /* TODO */
  37 #else
  38 #include <arpa/inet.h>
  39 #endif
  40 #include <glib.h>
  41 #include "libsigrok.h"
  42 #include "libsigrok-internal.h"
  43 #include "ols.h"
  44
  45 #ifdef _WIN32
  46 #define O_NONBLOCK FIONBIO
  47 #endif
  48
  49 static const int hwcaps[] = {
  50         SR_HWCAP_LOGIC_ANALYZER,
  51         SR_HWCAP_SAMPLERATE,
  52         SR_HWCAP_CAPTURE_RATIO,
  53         SR_HWCAP_LIMIT_SAMPLES,
  54         SR_HWCAP_RLE,
  55         0,
  56 };
  57
  58 /* Probes are numbered 0-31 (on the PCB silkscreen). */
  59 static const char *probe_names[NUM_PROBES + 1] = {
  60         "0",
  61         "1",
  62         "2",
  63         "3",
  64         "4",
  65         "5",
  66         "6",
  67         "7",
  68         "8",
  69         "9",
  70         "10",
  71         "11",
  72         "12",
  73         "13",
  74         "14",
  75         "15",
  76         "16",
  77         "17",
  78         "18",
  79         "19",
  80         "20",
  81         "21",
  82         "22",
  83         "23",
  84         "24",
  85         "25",
  86         "26",
  87         "27",
  88         "28",
  89         "29",
  90         "30",
  91         "31",
  92         NULL,
  93 };
  94
  95 /* default supported samplerates, can be overridden by device metadata */
  96 static const struct sr_samplerates samplerates = {
  97         SR_HZ(10),
  98         SR_MHZ(200),
  99         SR_HZ(1),
 100         NULL,
 101 };
 102
 103 SR_PRIV struct sr_dev_driver ols_driver_info;
 104 static struct sr_dev_driver *odi = &ols_driver_info;
 105
 106 static int send_shortcommand(int fd, uint8_t command)
 107 {
 108         char buf[1];
 109
 110         sr_dbg("ols: sending cmd 0x%.2x", command);
 111         buf[0] = command;
 112         if (serial_write(fd, buf, 1) != 1)
 113                 return SR_ERR;
 114
 115         return SR_OK;
 116 }
 117
 118 static int send_longcommand(int fd, uint8_t command, uint32_t data)
 119 {
 120         char buf[5];
 121
 122         sr_dbg("ols: sending cmd 0x%.2x data 0x%.8x", command, data);
 123         buf[0] = command;
 124         buf[1] = (data & 0xff000000) >> 24;
 125         buf[2] = (data & 0xff0000) >> 16;
 126         buf[3] = (data & 0xff00) >> 8;
 127         buf[4] = data & 0xff;
 128         if (serial_write(fd, buf, 5) != 5)
 129                 return SR_ERR;
 130
 131         return SR_OK;
 132 }
 133
 134 static int configure_probes(struct context *ctx, const GSList *probes)
 135 {
 136         const struct sr_probe *probe;
 137         const GSList *l;
 138         int probe_bit, stage, i;
 139         char *tc;
 140
 141         ctx->probe_mask = 0;
 142         for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
 143                 ctx->trigger_mask[i] = 0;
 144                 ctx->trigger_value[i] = 0;
 145         }
 146
 147         ctx->num_stages = 0;
 148         for (l = probes; l; l = l->next) {
 149                 probe = (const struct sr_probe *)l->data;
 150                 if (!probe->enabled)
 151                         continue;
 152
 153                 /*
 154                  * Set up the probe mask for later configuration into the
 155                  * flag register.
 156                  */
 157                 probe_bit = 1 << (probe->index - 1);
 158                 ctx->probe_mask |= probe_bit;
 159
 160                 if (!probe->trigger)
 161                         continue;
 162
 163                 /* Configure trigger mask and value. */
 164                 stage = 0;
 165                 for (tc = probe->trigger; tc && *tc; tc++) {
 166                         ctx->trigger_mask[stage] |= probe_bit;
 167                         if (*tc == '1')
 168                                 ctx->trigger_value[stage] |= probe_bit;
 169                         stage++;
 170                         if (stage > 3)
 171                                 /*
 172                                  * TODO: Only supporting parallel mode, with
 173                                  * up to 4 stages.
 174                                  */
 175                                 return SR_ERR;
 176                 }
 177                 if (stage > ctx->num_stages)
 178                         ctx->num_stages = stage;
 179         }
 180
 181         return SR_OK;
 182 }
 183
 184 static uint32_t reverse16(uint32_t in)
 185 {
 186         uint32_t out;
 187
 188         out = (in & 0xff) << 8;
 189         out |= (in & 0xff00) >> 8;
 190         out |= (in & 0xff0000) << 8;
 191         out |= (in & 0xff000000) >> 8;
 192
 193         return out;
 194 }
 195
 196 static uint32_t reverse32(uint32_t in)
 197 {
 198         uint32_t out;
 199
 200         out = (in & 0xff) << 24;
 201         out |= (in & 0xff00) << 8;
 202         out |= (in & 0xff0000) >> 8;
 203         out |= (in & 0xff000000) >> 24;
 204
 205         return out;
 206 }
 207
 208 static struct context *ols_dev_new(void)
 209 {
 210         struct context *ctx;
 211
 212         /* TODO: Is 'ctx' ever g_free()'d? */
 213         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
 214                 sr_err("ols: %s: ctx malloc failed", __func__);
 215                 return NULL;
 216         }
 217
 218         ctx->trigger_at = -1;
 219         ctx->probe_mask = 0xffffffff;
 220         ctx->cur_samplerate = SR_KHZ(200);
 221         ctx->serial = NULL;
 222
 223         return ctx;
 224 }
 225
 226 static struct sr_dev_inst *get_metadata(int fd)
 227 {
 228         struct sr_dev_inst *sdi;
 229         struct context *ctx;
 230         struct sr_probe *probe;
 231         uint32_t tmp_int, ui;
 232         uint8_t key, type, token;
 233         GString *tmp_str, *devname, *version;
 234         guchar tmp_c;
 235
 236         sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, NULL, NULL, NULL);
 237         sdi->driver = odi;
 238         ctx = ols_dev_new();
 239         sdi->priv = ctx;
 240
 241         devname = g_string_new("");
 242         version = g_string_new("");
 243
 244         key = 0xff;
 245         while (key) {
 246                 if (serial_read(fd, &key, 1) != 1 || key == 0x00)
 247                         break;
 248                 type = key >> 5;
 249                 token = key & 0x1f;
 250                 switch (type) {
 251                 case 0:
 252                         /* NULL-terminated string */
 253                         tmp_str = g_string_new("");
 254                         while (serial_read(fd, &tmp_c, 1) == 1 && tmp_c != '\0')
 255                                 g_string_append_c(tmp_str, tmp_c);
 256                         sr_dbg("ols: got metadata key 0x%.2x value '%s'",
 257                                key, tmp_str->str);
 258                         switch (token) {
 259                         case 0x01:
 260                                 /* Device name */
 261                                 devname = g_string_append(devname, tmp_str->str);
 262                                 break;
 263                         case 0x02:
 264                                 /* FPGA firmware version */
 265                                 if (version->len)
 266                                         g_string_append(version, ", ");
 267                                 g_string_append(version, "FPGA version ");
 268                                 g_string_append(version, tmp_str->str);
 269                                 break;
 270                         case 0x03:
 271                                 /* Ancillary version */
 272                                 if (version->len)
 273                                         g_string_append(version, ", ");
 274                                 g_string_append(version, "Ancillary version ");
 275                                 g_string_append(version, tmp_str->str);
 276                                 break;
 277                         default:
 278                                 sr_info("ols: unknown token 0x%.2x: '%s'",
 279                                         token, tmp_str->str);
 280                                 break;
 281                         }
 282                         g_string_free(tmp_str, TRUE);
 283                         break;
 284                 case 1:
 285                         /* 32-bit unsigned integer */
 286                         if (serial_read(fd, &tmp_int, 4) != 4)
 287                                 break;
 288                         tmp_int = reverse32(tmp_int);
 289                         sr_dbg("ols: got metadata key 0x%.2x value 0x%.8x",
 290                                key, tmp_int);
 291                         switch (token) {
 292                         case 0x00:
 293                                 /* Number of usable probes */
 294                                 for (ui = 0; ui < tmp_int; ui++) {
 295                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 296                                                         probe_names[ui])))
 297                                                 return 0;
 298                                         sdi->probes = g_slist_append(sdi->probes, probe);
 299                                 }
 300                                 break;
 301                         case 0x01:
 302                                 /* Amount of sample memory available (bytes) */
 303                                 ctx->max_samples = tmp_int;
 304                                 break;
 305                         case 0x02:
 306                                 /* Amount of dynamic memory available (bytes) */
 307                                 /* what is this for? */
 308                                 break;
 309                         case 0x03:
 310                                 /* Maximum sample rate (hz) */
 311                                 ctx->max_samplerate = tmp_int;
 312                                 break;
 313                         case 0x04:
 314                                 /* protocol version */
 315                                 ctx->protocol_version = tmp_int;
 316                                 break;
 317                         default:
 318                                 sr_info("ols: unknown token 0x%.2x: 0x%.8x",
 319                                         token, tmp_int);
 320                                 break;
 321                         }
 322                         break;
 323                 case 2:
 324                         /* 8-bit unsigned integer */
 325                         if (serial_read(fd, &tmp_c, 1) != 1)
 326                                 break;
 327                         sr_dbg("ols: got metadata key 0x%.2x value 0x%.2x",
 328                                key, tmp_c);
 329                         switch (token) {
 330                         case 0x00:
 331                                 /* Number of usable probes */
 332                                 for (ui = 0; ui < tmp_c; ui++) {
 333                                         if (!(probe = sr_probe_new(ui, SR_PROBE_LOGIC, TRUE,
 334                                                         probe_names[ui])))
 335                                                 return 0;
 336                                         sdi->probes = g_slist_append(sdi->probes, probe);
 337                                 }
 338                                 break;
 339                         case 0x01:
 340                                 /* protocol version */
 341                                 ctx->protocol_version = tmp_c;
 342                                 break;
 343                         default:
 344                                 sr_info("ols: unknown token 0x%.2x: 0x%.2x",
 345                                         token, tmp_c);
 346                                 break;
 347                         }
 348                         break;
 349                 default:
 350                         /* unknown type */
 351                         break;
 352                 }
 353         }
 354
 355         sdi->model = devname->str;
 356         sdi->version = version->str;
 357         g_string_free(devname, FALSE);
 358         g_string_free(version, FALSE);
 359
 360         return sdi;
 361 }
 362
 363 static int hw_init(void)
 364 {
 365
 366         /* Nothing to do. */
 367
 368         return SR_OK;
 369 }
 370
 371 static GSList *hw_scan(GSList *options)
 372 {
 373         struct sr_dev_inst *sdi;
 374         struct context *ctx;
 375         struct sr_probe *probe;
 376         GSList *devices, *ports, *l;
 377         GPollFD *fds, probefd;
 378         int devcnt, final_devcnt, num_ports, fd, ret, i, j;
 379         char buf[8], **dev_names, **serial_params;
 380
 381         (void)options;
 382         final_devcnt = 0;
 383         devices = NULL;
 384
 385         /* Scan all serial ports. */
 386         ports = list_serial_ports();
 387         num_ports = g_slist_length(ports);
 388
 389         if (!(fds = g_try_malloc0(num_ports * sizeof(GPollFD)))) {
 390                 sr_err("ols: %s: fds malloc failed", __func__);
 391                 goto hw_init_free_ports; /* TODO: SR_ERR_MALLOC. */
 392         }
 393
 394         if (!(dev_names = g_try_malloc(num_ports * sizeof(char *)))) {
 395                 sr_err("ols: %s: dev_names malloc failed", __func__);
 396                 goto hw_init_free_fds; /* TODO: SR_ERR_MALLOC. */
 397         }
 398
 399         if (!(serial_params = g_try_malloc(num_ports * sizeof(char *)))) {
 400                 sr_err("ols: %s: serial_params malloc failed", __func__);
 401                 goto hw_init_free_dev_names; /* TODO: SR_ERR_MALLOC. */
 402         }
 403
 404         devcnt = 0;
 405         for (l = ports; l; l = l->next) {
 406                 /* The discovery procedure is like this: first send the Reset
 407                  * command (0x00) 5 times, since the device could be anywhere
 408                  * in a 5-byte command. Then send the ID command (0x02).
 409                  * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 410                  * have a match.
 411                  *
 412                  * Since it may take the device a while to respond at 115Kb/s,
 413                  * we do all the sending first, then wait for all of them to
 414                  * respond with g_poll().
 415                  */
 416                 sr_info("ols: probing %s...", (char *)l->data);
 417                 fd = serial_open(l->data, O_RDWR | O_NONBLOCK);
 418                 if (fd != -1) {
 419                         serial_params[devcnt] = serial_backup_params(fd);
 420                         serial_set_params(fd, 115200, 8, SERIAL_PARITY_NONE, 1, 2);
 421                         ret = SR_OK;
 422                         for (i = 0; i < 5; i++) {
 423                                 if ((ret = send_shortcommand(fd,
 424                                         CMD_RESET)) != SR_OK) {
 425                                         /* Serial port is not writable. */
 426                                         break;
 427                                 }
 428                         }
 429                         if (ret != SR_OK) {
 430                                 serial_restore_params(fd,
 431                                         serial_params[devcnt]);
 432                                 serial_close(fd);
 433                                 continue;
 434                         }
 435                         send_shortcommand(fd, CMD_ID);
 436                         fds[devcnt].fd = fd;
 437                         fds[devcnt].events = G_IO_IN;
 438                         dev_names[devcnt] = g_strdup(l->data);
 439                         devcnt++;
 440                 }
 441                 g_free(l->data);
 442         }
 443
 444         /* 2ms isn't enough for reliable transfer with pl2303, let's try 10 */
 445         usleep(10000);
 446
 447         g_poll(fds, devcnt, 1);
 448
 449         for (i = 0; i < devcnt; i++) {
 450                 if (fds[i].revents != G_IO_IN)
 451                         continue;
 452                 if (serial_read(fds[i].fd, buf, 4) != 4)
 453                         continue;
 454                 if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4))
 455                         continue;
 456
 457                 /* definitely using the OLS protocol, check if it supports
 458                  * the metadata command
 459                  */
 460                 send_shortcommand(fds[i].fd, CMD_METADATA);
 461                 probefd.fd = fds[i].fd;
 462                 probefd.events = G_IO_IN;
 463                 if (g_poll(&probefd, 1, 10) > 0) {
 464                         /* got metadata */
 465                         sdi = get_metadata(fds[i].fd);
 466                         sdi->index = final_devcnt;
 467                         ctx = sdi->priv;
 468                 } else {
 469                         /* not an OLS -- some other board that uses the sump protocol */
 470                         sdi = sr_dev_inst_new(final_devcnt, SR_ST_INACTIVE,
 471                                         "Sump", "Logic Analyzer", "v1.0");
 472                         sdi->driver = odi;
 473                         ctx = ols_dev_new();
 474                         for (j = 0; j < 32; j++) {
 475                                 if (!(probe = sr_probe_new(j, SR_PROBE_LOGIC, TRUE,
 476                                                 probe_names[j])))
 477                                         return 0;
 478                                 sdi->probes = g_slist_append(sdi->probes, probe);
 479                         }
 480                         sdi->priv = ctx;
 481                 }
 482                 ctx->serial = sr_serial_dev_inst_new(dev_names[i], -1);
 483                 odi->instances = g_slist_append(odi->instances, sdi);
 484                 devices = g_slist_append(devices, sdi);
 485
 486                 final_devcnt++;
 487                 serial_close(fds[i].fd);
 488                 fds[i].fd = 0;
 489         }
 490
 491         /* clean up after all the probing */
 492         for (i = 0; i < devcnt; i++) {
 493                 if (fds[i].fd != 0) {
 494                         serial_restore_params(fds[i].fd, serial_params[i]);
 495                         serial_close(fds[i].fd);
 496                 }
 497                 g_free(serial_params[i]);
 498                 g_free(dev_names[i]);
 499         }
 500
 501         g_free(serial_params);
 502 hw_init_free_dev_names:
 503         g_free(dev_names);
 504 hw_init_free_fds:
 505         g_free(fds);
 506 hw_init_free_ports:
 507         g_slist_free(ports);
 508
 509         return devices;
 510 }
 511
 512 static int hw_dev_open(struct sr_dev_inst *sdi)
 513 {
 514         struct context *ctx;
 515
 516         ctx = sdi->priv;
 517
 518         ctx->serial->fd = serial_open(ctx->serial->port, O_RDWR);
 519         if (ctx->serial->fd == -1)
 520                 return SR_ERR;
 521
 522         sdi->status = SR_ST_ACTIVE;
 523
 524         return SR_OK;
 525 }
 526
 527 static int hw_dev_close(struct sr_dev_inst *sdi)
 528 {
 529         struct context *ctx;
 530
 531         ctx = sdi->priv;
 532
 533         if (ctx->serial->fd != -1) {
 534                 serial_close(ctx->serial->fd);
 535                 ctx->serial->fd = -1;
 536                 sdi->status = SR_ST_INACTIVE;
 537         }
 538
 539         return SR_OK;
 540 }
 541
 542 static int hw_cleanup(void)
 543 {
 544         GSList *l;
 545         struct sr_dev_inst *sdi;
 546         struct context *ctx;
 547         int ret = SR_OK;
 548
 549         /* Properly close and free all devices. */
 550         for (l = odi->instances; l; l = l->next) {
 551                 if (!(sdi = l->data)) {
 552                         /* Log error, but continue cleaning up the rest. */
 553                         sr_err("ols: %s: sdi was NULL, continuing", __func__);
 554                         ret = SR_ERR_BUG;
 555                         continue;
 556                 }
 557                 if (!(ctx = sdi->priv)) {
 558                         /* Log error, but continue cleaning up the rest. */
 559                         sr_err("ols: %s: sdi->priv was NULL, continuing",
 560                                __func__);
 561                         ret = SR_ERR_BUG;
 562                         continue;
 563                 }
 564                 /* TODO: Check for serial != NULL. */
 565                 if (ctx->serial->fd != -1)
 566                         serial_close(ctx->serial->fd);
 567                 sr_serial_dev_inst_free(ctx->serial);
 568                 sr_dev_inst_free(sdi);
 569         }
 570         g_slist_free(odi->instances);
 571         odi->instances = NULL;
 572
 573         return ret;
 574 }
 575
 576 static int hw_info_get(int info_id, const void **data,
 577        const struct sr_dev_inst *sdi)
 578 {
 579         struct context *ctx;
 580
 581         switch (info_id) {
 582         case SR_DI_INST:
 583                 *data = sdi;
 584                 break;
 585         case SR_DI_HWCAPS:
 586                 *data = hwcaps;
 587                 break;
 588         case SR_DI_NUM_PROBES:
 589                 *data = GINT_TO_POINTER(1);
 590                 break;
 591         case SR_DI_PROBE_NAMES:
 592                 *data = probe_names;
 593                 break;
 594         case SR_DI_SAMPLERATES:
 595                 *data = &samplerates;
 596                 break;
 597         case SR_DI_TRIGGER_TYPES:
 598                 *data = (char *)TRIGGER_TYPES;
 599                 break;
 600         case SR_DI_CUR_SAMPLERATE:
 601                 if (sdi) {
 602                         ctx = sdi->priv;
 603                         *data = &ctx->cur_samplerate;
 604                 } else
 605                         return SR_ERR;
 606                 break;
 607         default:
 608                 return SR_ERR_ARG;
 609         }
 610
 611         return SR_OK;
 612 }
 613
 614 static int set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
 615 {
 616         struct context *ctx;
 617
 618         ctx = sdi->priv;
 619         if (ctx->max_samplerate) {
 620                 if (samplerate > ctx->max_samplerate)
 621                         return SR_ERR_SAMPLERATE;
 622         } else if (samplerate < samplerates.low || samplerate > samplerates.high)
 623                 return SR_ERR_SAMPLERATE;
 624
 625         if (samplerate > CLOCK_RATE) {
 626                 ctx->flag_reg |= FLAG_DEMUX;
 627                 ctx->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
 628         } else {
 629                 ctx->flag_reg &= ~FLAG_DEMUX;
 630                 ctx->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
 631         }
 632
 633         /* Calculate actual samplerate used and complain if it is different
 634          * from the requested.
 635          */
 636         ctx->cur_samplerate = CLOCK_RATE / (ctx->cur_samplerate_divider + 1);
 637         if (ctx->flag_reg & FLAG_DEMUX)
 638                 ctx->cur_samplerate *= 2;
 639         if (ctx->cur_samplerate != samplerate)
 640                 sr_err("ols: can't match samplerate %" PRIu64 ", using %"
 641                        PRIu64, samplerate, ctx->cur_samplerate);
 642
 643         return SR_OK;
 644 }
 645
 646 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 647                 const void *value)
 648 {
 649         struct context *ctx;
 650         int ret;
 651         const uint64_t *tmp_u64;
 652
 653         ctx = sdi->priv;
 654
 655         if (sdi->status != SR_ST_ACTIVE)
 656                 return SR_ERR;
 657
 658         switch (hwcap) {
 659         case SR_HWCAP_SAMPLERATE:
 660                 ret = set_samplerate(sdi, *(const uint64_t *)value);
 661                 break;
 662         case SR_HWCAP_PROBECONFIG:
 663                 ret = configure_probes(ctx, (const GSList *)value);
 664                 break;
 665         case SR_HWCAP_LIMIT_SAMPLES:
 666                 tmp_u64 = value;
 667                 if (*tmp_u64 < MIN_NUM_SAMPLES)
 668                         return SR_ERR;
 669                 if (*tmp_u64 > ctx->max_samples)
 670                         sr_err("ols: sample limit exceeds hw max");
 671                 ctx->limit_samples = *tmp_u64;
 672                 sr_info("ols: sample limit %" PRIu64, ctx->limit_samples);
 673                 ret = SR_OK;
 674                 break;
 675         case SR_HWCAP_CAPTURE_RATIO:
 676                 ctx->capture_ratio = *(const uint64_t *)value;
 677                 if (ctx->capture_ratio < 0 || ctx->capture_ratio > 100) {
 678                         ctx->capture_ratio = 0;
 679                         ret = SR_ERR;
 680                 } else
 681                         ret = SR_OK;
 682                 break;
 683         case SR_HWCAP_RLE:
 684                 if (GPOINTER_TO_INT(value)) {
 685                         sr_info("ols: enabling RLE");
 686                         ctx->flag_reg |= FLAG_RLE;
 687                 }
 688                 ret = SR_OK;
 689                 break;
 690         default:
 691                 ret = SR_ERR;
 692         }
 693
 694         return ret;
 695 }
 696
 697 static int receive_data(int fd, int revents, void *cb_data)
 698 {
 699         struct sr_datafeed_packet packet;
 700         struct sr_datafeed_logic logic;
 701         struct sr_dev_inst *sdi;
 702         struct context *ctx;
 703         GSList *l;
 704         int num_channels, offset, i, j;
 705         unsigned char byte;
 706
 707         /* Find this device's ctx struct by its fd. */
 708         ctx = NULL;
 709         for (l = odi->instances; l; l = l->next) {
 710                 sdi = l->data;
 711                 ctx = sdi->priv;
 712                 if (ctx->serial->fd == fd) {
 713                         break;
 714                 }
 715                 ctx = NULL;
 716         }
 717         if (!ctx)
 718                 /* Shouldn't happen. */
 719                 return TRUE;
 720
 721         if (ctx->num_transfers++ == 0) {
 722                 /*
 723                  * First time round, means the device started sending data,
 724                  * and will not stop until done. If it stops sending for
 725                  * longer than it takes to send a byte, that means it's
 726                  * finished. We'll double that to 30ms to be sure...
 727                  */
 728                 sr_source_remove(fd);
 729                 sr_source_add(fd, G_IO_IN, 30, receive_data, cb_data);
 730                 ctx->raw_sample_buf = g_try_malloc(ctx->limit_samples * 4);
 731                 if (!ctx->raw_sample_buf) {
 732                         sr_err("ols: %s: ctx->raw_sample_buf malloc failed",
 733                                __func__);
 734                         return FALSE;
 735                 }
 736                 /* fill with 1010... for debugging */
 737                 memset(ctx->raw_sample_buf, 0x82, ctx->limit_samples * 4);
 738         }
 739
 740         num_channels = 0;
 741         for (i = 0x20; i > 0x02; i /= 2) {
 742                 if ((ctx->flag_reg & i) == 0)
 743                         num_channels++;
 744         }
 745
 746         if (revents == G_IO_IN) {
 747                 if (serial_read(fd, &byte, 1) != 1)
 748                         return FALSE;
 749
 750                 /* Ignore it if we've read enough. */
 751                 if (ctx->num_samples >= ctx->limit_samples)
 752                         return TRUE;
 753
 754                 ctx->sample[ctx->num_bytes++] = byte;
 755                 sr_dbg("ols: received byte 0x%.2x", byte);
 756                 if (ctx->num_bytes == num_channels) {
 757                         /* Got a full sample. */
 758                         sr_dbg("ols: received sample 0x%.*x",
 759                                ctx->num_bytes * 2, *(int *)ctx->sample);
 760                         if (ctx->flag_reg & FLAG_RLE) {
 761                                 /*
 762                                  * In RLE mode -1 should never come in as a
 763                                  * sample, because bit 31 is the "count" flag.
 764                                  */
 765                                 if (ctx->sample[ctx->num_bytes - 1] & 0x80) {
 766                                         ctx->sample[ctx->num_bytes - 1] &= 0x7f;
 767                                         /*
 768                                          * FIXME: This will only work on
 769                                          * little-endian systems.
 770                                          */
 771                                         ctx->rle_count = *(int *)(ctx->sample);
 772                                         sr_dbg("ols: RLE count = %d", ctx->rle_count);
 773                                         ctx->num_bytes = 0;
 774                                         return TRUE;
 775                                 }
 776                         }
 777                         ctx->num_samples += ctx->rle_count + 1;
 778                         if (ctx->num_samples > ctx->limit_samples) {
 779                                 /* Save us from overrunning the buffer. */
 780                                 ctx->rle_count -= ctx->num_samples - ctx->limit_samples;
 781                                 ctx->num_samples = ctx->limit_samples;
 782                         }
 783
 784                         if (num_channels < 4) {
 785                                 /*
 786                                  * Some channel groups may have been turned
 787                                  * off, to speed up transfer between the
 788                                  * hardware and the PC. Expand that here before
 789                                  * submitting it over the session bus --
 790                                  * whatever is listening on the bus will be
 791                                  * expecting a full 32-bit sample, based on
 792                                  * the number of probes.
 793                                  */
 794                                 j = 0;
 795                                 memset(ctx->tmp_sample, 0, 4);
 796                                 for (i = 0; i < 4; i++) {
 797                                         if (((ctx->flag_reg >> 2) & (1 << i)) == 0) {
 798                                                 /*
 799                                                  * This channel group was
 800                                                  * enabled, copy from received
 801                                                  * sample.
 802                                                  */
 803                                                 ctx->tmp_sample[i] = ctx->sample[j++];
 804                                         }
 805                                 }
 806                                 memcpy(ctx->sample, ctx->tmp_sample, 4);
 807                                 sr_dbg("ols: full sample 0x%.8x", *(int *)ctx->sample);
 808                         }
 809
 810                         /* the OLS sends its sample buffer backwards.
 811                          * store it in reverse order here, so we can dump
 812                          * this on the session bus later.
 813                          */
 814                         offset = (ctx->limit_samples - ctx->num_samples) * 4;
 815                         for (i = 0; i <= ctx->rle_count; i++) {
 816                                 memcpy(ctx->raw_sample_buf + offset + (i * 4),
 817                                        ctx->sample, 4);
 818                         }
 819                         memset(ctx->sample, 0, 4);
 820                         ctx->num_bytes = 0;
 821                         ctx->rle_count = 0;
 822                 }
 823         } else {
 824                 /*
 825                  * This is the main loop telling us a timeout was reached, or
 826                  * we've acquired all the samples we asked for -- we're done.
 827                  * Send the (properly-ordered) buffer to the frontend.
 828                  */
 829                 if (ctx->trigger_at != -1) {
 830                         /* a trigger was set up, so we need to tell the frontend
 831                          * about it.
 832                          */
 833                         if (ctx->trigger_at > 0) {
 834                                 /* there are pre-trigger samples, send those first */
 835                                 packet.type = SR_DF_LOGIC;
 836                                 packet.payload = &logic;
 837                                 logic.length = ctx->trigger_at * 4;
 838                                 logic.unitsize = 4;
 839                                 logic.data = ctx->raw_sample_buf +
 840                                         (ctx->limit_samples - ctx->num_samples) * 4;
 841                                 sr_session_send(cb_data, &packet);
 842                         }
 843
 844                         /* send the trigger */
 845                         packet.type = SR_DF_TRIGGER;
 846                         sr_session_send(cb_data, &packet);
 847
 848                         /* send post-trigger samples */
 849                         packet.type = SR_DF_LOGIC;
 850                         packet.payload = &logic;
 851                         logic.length = (ctx->num_samples * 4) - (ctx->trigger_at * 4);
 852                         logic.unitsize = 4;
 853                         logic.data = ctx->raw_sample_buf + ctx->trigger_at * 4 +
 854                                 (ctx->limit_samples - ctx->num_samples) * 4;
 855                         sr_session_send(cb_data, &packet);
 856                 } else {
 857                         /* no trigger was used */
 858                         packet.type = SR_DF_LOGIC;
 859                         packet.payload = &logic;
 860                         logic.length = ctx->num_samples * 4;
 861                         logic.unitsize = 4;
 862                         logic.data = ctx->raw_sample_buf +
 863                                 (ctx->limit_samples - ctx->num_samples) * 4;
 864                         sr_session_send(cb_data, &packet);
 865                 }
 866                 g_free(ctx->raw_sample_buf);
 867
 868                 serial_flush(fd);
 869                 serial_close(fd);
 870                 packet.type = SR_DF_END;
 871                 sr_session_send(cb_data, &packet);
 872         }
 873
 874         return TRUE;
 875 }
 876
 877 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 878                 void *cb_data)
 879 {
 880         struct sr_datafeed_packet *packet;
 881         struct sr_datafeed_header *header;
 882         struct sr_datafeed_meta_logic meta;
 883         struct context *ctx;
 884         uint32_t trigger_config[4];
 885         uint32_t data;
 886         uint16_t readcount, delaycount;
 887         uint8_t changrp_mask;
 888         int num_channels;
 889         int i;
 890
 891         ctx = sdi->priv;
 892
 893         if (sdi->status != SR_ST_ACTIVE)
 894                 return SR_ERR;
 895
 896         /*
 897          * Enable/disable channel groups in the flag register according to the
 898          * probe mask. Calculate this here, because num_channels is needed
 899          * to limit readcount.
 900          */
 901         changrp_mask = 0;
 902         num_channels = 0;
 903         for (i = 0; i < 4; i++) {
 904                 if (ctx->probe_mask & (0xff << (i * 8))) {
 905                         changrp_mask |= (1 << i);
 906                         num_channels++;
 907                 }
 908         }
 909
 910         /*
 911          * Limit readcount to prevent reading past the end of the hardware
 912          * buffer.
 913          */
 914         readcount = MIN(ctx->max_samples / num_channels, ctx->limit_samples) / 4;
 915
 916         memset(trigger_config, 0, 16);
 917         trigger_config[ctx->num_stages - 1] |= 0x08;
 918         if (ctx->trigger_mask[0]) {
 919                 delaycount = readcount * (1 - ctx->capture_ratio / 100.0);
 920                 ctx->trigger_at = (readcount - delaycount) * 4 - ctx->num_stages;
 921
 922                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_MASK_0,
 923                         reverse32(ctx->trigger_mask[0])) != SR_OK)
 924                         return SR_ERR;
 925                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_VALUE_0,
 926                         reverse32(ctx->trigger_value[0])) != SR_OK)
 927                         return SR_ERR;
 928                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_CONFIG_0,
 929                         trigger_config[0]) != SR_OK)
 930                         return SR_ERR;
 931
 932                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_MASK_1,
 933                         reverse32(ctx->trigger_mask[1])) != SR_OK)
 934                         return SR_ERR;
 935                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_VALUE_1,
 936                         reverse32(ctx->trigger_value[1])) != SR_OK)
 937                         return SR_ERR;
 938                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_CONFIG_1,
 939                         trigger_config[1]) != SR_OK)
 940                         return SR_ERR;
 941
 942                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_MASK_2,
 943                         reverse32(ctx->trigger_mask[2])) != SR_OK)
 944                         return SR_ERR;
 945                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_VALUE_2,
 946                         reverse32(ctx->trigger_value[2])) != SR_OK)
 947                         return SR_ERR;
 948                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_CONFIG_2,
 949                         trigger_config[2]) != SR_OK)
 950                         return SR_ERR;
 951
 952                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_MASK_3,
 953                         reverse32(ctx->trigger_mask[3])) != SR_OK)
 954                         return SR_ERR;
 955                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_VALUE_3,
 956                         reverse32(ctx->trigger_value[3])) != SR_OK)
 957                         return SR_ERR;
 958                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_CONFIG_3,
 959                         trigger_config[3]) != SR_OK)
 960                         return SR_ERR;
 961         } else {
 962                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_MASK_0,
 963                                 ctx->trigger_mask[0]) != SR_OK)
 964                         return SR_ERR;
 965                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_VALUE_0,
 966                                 ctx->trigger_value[0]) != SR_OK)
 967                         return SR_ERR;
 968                 if (send_longcommand(ctx->serial->fd, CMD_SET_TRIGGER_CONFIG_0,
 969                      0x00000008) != SR_OK)
 970                         return SR_ERR;
 971                 delaycount = readcount;
 972         }
 973
 974         sr_info("ols: setting samplerate to %" PRIu64 " Hz (divider %u, "
 975                 "demux %s)", ctx->cur_samplerate, ctx->cur_samplerate_divider,
 976                 ctx->flag_reg & FLAG_DEMUX ? "on" : "off");
 977         if (send_longcommand(ctx->serial->fd, CMD_SET_DIVIDER,
 978                         reverse32(ctx->cur_samplerate_divider)) != SR_OK)
 979                 return SR_ERR;
 980
 981         /* Send sample limit and pre/post-trigger capture ratio. */
 982         data = ((readcount - 1) & 0xffff) << 16;
 983         data |= (delaycount - 1) & 0xffff;
 984         if (send_longcommand(ctx->serial->fd, CMD_CAPTURE_SIZE, reverse16(data)) != SR_OK)
 985                 return SR_ERR;
 986
 987         /* The flag register wants them here, and 1 means "disable channel". */
 988         ctx->flag_reg |= ~(changrp_mask << 2) & 0x3c;
 989         ctx->flag_reg |= FLAG_FILTER;
 990         ctx->rle_count = 0;
 991         data = (ctx->flag_reg << 24) | ((ctx->flag_reg << 8) & 0xff0000);
 992         if (send_longcommand(ctx->serial->fd, CMD_SET_FLAGS, data) != SR_OK)
 993                 return SR_ERR;
 994
 995         /* Start acquisition on the device. */
 996         if (send_shortcommand(ctx->serial->fd, CMD_RUN) != SR_OK)
 997                 return SR_ERR;
 998
 999         sr_source_add(ctx->serial->fd, G_IO_IN, -1, receive_data,
1000                       cb_data);
1001
1002         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
1003                 sr_err("ols: %s: packet malloc failed", __func__);
1004                 return SR_ERR_MALLOC;
1005         }
1006
1007         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
1008                 sr_err("ols: %s: header malloc failed", __func__);
1009                 g_free(packet);
1010                 return SR_ERR_MALLOC;
1011         }
1012
1013         /* Send header packet to the session bus. */
1014         packet->type = SR_DF_HEADER;
1015         packet->payload = (unsigned char *)header;
1016         header->feed_version = 1;
1017         gettimeofday(&header->starttime, NULL);
1018         sr_session_send(cb_data, packet);
1019
1020         /* Send metadata about the SR_DF_LOGIC packets to come. */
1021         packet->type = SR_DF_META_LOGIC;
1022         packet->payload = &meta;
1023         meta.samplerate = ctx->cur_samplerate;
1024         meta.num_probes = NUM_PROBES;
1025         sr_session_send(cb_data, packet);
1026
1027         g_free(header);
1028         g_free(packet);
1029
1030         return SR_OK;
1031 }
1032
1033 /* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
1034 static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
1035                 void *cb_data)
1036 {
1037         struct sr_datafeed_packet packet;
1038
1039         /* Avoid compiler warnings. */
1040         (void)sdi;
1041
1042         packet.type = SR_DF_END;
1043         sr_session_send(cb_data, &packet);
1044
1045         return SR_OK;
1046 }
1047
1048 SR_PRIV struct sr_dev_driver ols_driver_info = {
1049         .name = "ols",
1050         .longname = "Openbench Logic Sniffer",
1051         .api_version = 1,
1052         .init = hw_init,
1053         .cleanup = hw_cleanup,
1054         .scan = hw_scan,
1055         .dev_open = hw_dev_open,
1056         .dev_close = hw_dev_close,
1057         .info_get = hw_info_get,
1058         .dev_config_set = hw_dev_config_set,
1059         .dev_acquisition_start = hw_dev_acquisition_start,
1060         .dev_acquisition_stop = hw_dev_acquisition_stop,
1061         .instances = NULL,
1062 };