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