src/hardware/openbench-logic-sniffer/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include "protocol.h"
  22
  23 #define SERIALCOMM "115200/8n1"
  24
  25 static const uint32_t drvopts[] = {
  26         SR_CONF_LOGIC_ANALYZER,
  27 };
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31         SR_CONF_SERIALCOMM,
  32 };
  33
  34 static const uint32_t devopts[] = {
  35         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  36         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  37         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  38         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  39         SR_CONF_EXTERNAL_CLOCK | SR_CONF_SET,
  40         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  41         SR_CONF_SWAP | SR_CONF_SET,
  42         SR_CONF_RLE | SR_CONF_GET | SR_CONF_SET,
  43 };
  44
  45 static const int32_t trigger_matches[] = {
  46         SR_TRIGGER_ZERO,
  47         SR_TRIGGER_ONE,
  48 };
  49
  50 #define STR_PATTERN_NONE     "None"
  51 #define STR_PATTERN_EXTERNAL "External"
  52 #define STR_PATTERN_INTERNAL "Internal"
  53
  54 /* Supported methods of test pattern outputs */
  55 enum {
  56         /**
  57          * Capture pins 31:16 (unbuffered wing) output a test pattern
  58          * that can captured on pins 0:15.
  59          */
  60         PATTERN_EXTERNAL,
  61
  62         /** Route test pattern internally to capture buffer. */
  63         PATTERN_INTERNAL,
  64 };
  65
  66 static const char *patterns[] = {
  67         STR_PATTERN_NONE,
  68         STR_PATTERN_EXTERNAL,
  69         STR_PATTERN_INTERNAL,
  70 };
  71
  72 /* Channels are numbered 0-31 (on the PCB silkscreen). */
  73 SR_PRIV const char *ols_channel_names[] = {
  74         "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
  75         "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
  76         "24", "25", "26", "27", "28", "29", "30", "31",
  77 };
  78
  79 /* Default supported samplerates, can be overridden by device metadata. */
  80 static const uint64_t samplerates[] = {
  81         SR_HZ(10),
  82         SR_MHZ(200),
  83         SR_HZ(1),
  84 };
  85
  86 #define RESPONSE_DELAY_US (10 * 1000)
  87
  88 SR_PRIV struct sr_dev_driver ols_driver_info;
  89
  90 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  91 {
  92         return std_init(sr_ctx, di, LOG_PREFIX);
  93 }
  94
  95 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  96 {
  97         struct sr_config *src;
  98         struct sr_dev_inst *sdi;
  99         struct drv_context *drvc;
 100         struct dev_context *devc;
 101         struct sr_serial_dev_inst *serial;
 102         GSList *l, *devices;
 103         int ret;
 104         unsigned int i;
 105         const char *conn, *serialcomm;
 106         char buf[8];
 107
 108         drvc = di->context;
 109
 110         devices = NULL;
 111
 112         conn = serialcomm = NULL;
 113         for (l = options; l; l = l->next) {
 114                 src = l->data;
 115                 switch (src->key) {
 116                 case SR_CONF_CONN:
 117                         conn = g_variant_get_string(src->data, NULL);
 118                         break;
 119                 case SR_CONF_SERIALCOMM:
 120                         serialcomm = g_variant_get_string(src->data, NULL);
 121                         break;
 122                 }
 123         }
 124         if (!conn)
 125                 return NULL;
 126
 127         if (!serialcomm)
 128                 serialcomm = SERIALCOMM;
 129
 130         serial = sr_serial_dev_inst_new(conn, serialcomm);
 131
 132         /* The discovery procedure is like this: first send the Reset
 133          * command (0x00) 5 times, since the device could be anywhere
 134          * in a 5-byte command. Then send the ID command (0x02).
 135          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 136          * have a match.
 137          */
 138         sr_info("Probing %s.", conn);
 139         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
 140                 return NULL;
 141
 142         ret = SR_OK;
 143         for (i = 0; i < 5; i++) {
 144                 if ((ret = send_shortcommand(serial, CMD_RESET)) != SR_OK) {
 145                         sr_err("Port %s is not writable.", conn);
 146                         break;
 147                 }
 148         }
 149         if (ret != SR_OK) {
 150                 serial_close(serial);
 151                 sr_err("Could not use port %s. Quitting.", conn);
 152                 return NULL;
 153         }
 154         send_shortcommand(serial, CMD_ID);
 155
 156         g_usleep(RESPONSE_DELAY_US);
 157
 158         if (sp_input_waiting(serial->data) == 0) {
 159                 sr_dbg("Didn't get any reply.");
 160                 return NULL;
 161         }
 162
 163         ret = serial_read_blocking(serial, buf, 4, serial_timeout(serial, 4));
 164         if (ret != 4) {
 165                 sr_err("Invalid reply (expected 4 bytes, got %d).", ret);
 166                 return NULL;
 167         }
 168
 169         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4)) {
 170                 sr_err("Invalid reply (expected '1SLO' or '1ALS', got "
 171                        "'%c%c%c%c').", buf[0], buf[1], buf[2], buf[3]);
 172                 return NULL;
 173         }
 174
 175         /* Definitely using the OLS protocol, check if it supports
 176          * the metadata command.
 177          */
 178         send_shortcommand(serial, CMD_METADATA);
 179
 180         g_usleep(RESPONSE_DELAY_US);
 181
 182         if (sp_input_waiting(serial->data) != 0) {
 183                 /* Got metadata. */
 184                 sdi = get_metadata(serial);
 185                 devc = sdi->priv;
 186         } else {
 187                 /* Not an OLS -- some other board that uses the sump protocol. */
 188                 sr_info("Device does not support metadata.");
 189                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 190                 sdi->status = SR_ST_INACTIVE;
 191                 sdi->vendor = g_strdup("Sump");
 192                 sdi->model = g_strdup("Logic Analyzer");
 193                 sdi->version = g_strdup("v1.0");
 194                 sdi->driver = di;
 195                 for (i = 0; i < ARRAY_SIZE(ols_channel_names); i++)
 196                         sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 197                                         ols_channel_names[i]);
 198                 devc = ols_dev_new();
 199                 sdi->priv = devc;
 200         }
 201         /* Configure samplerate and divider. */
 202         if (ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
 203                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
 204                                 DEFAULT_SAMPLERATE);
 205         sdi->inst_type = SR_INST_SERIAL;
 206         sdi->conn = serial;
 207
 208         drvc->instances = g_slist_append(drvc->instances, sdi);
 209         devices = g_slist_append(devices, sdi);
 210
 211         serial_close(serial);
 212
 213         return devices;
 214 }
 215
 216 static GSList *dev_list(const struct sr_dev_driver *di)
 217 {
 218         return ((struct drv_context *)(di->context))->instances;
 219 }
 220
 221 static int cleanup(const struct sr_dev_driver *di)
 222 {
 223         return std_dev_clear(di, NULL);
 224 }
 225
 226 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 227                 const struct sr_channel_group *cg)
 228 {
 229         struct dev_context *devc;
 230
 231         (void)cg;
 232
 233         if (!sdi)
 234                 return SR_ERR_ARG;
 235
 236         devc = sdi->priv;
 237         switch (key) {
 238         case SR_CONF_SAMPLERATE:
 239                 *data = g_variant_new_uint64(devc->cur_samplerate);
 240                 break;
 241         case SR_CONF_CAPTURE_RATIO:
 242                 *data = g_variant_new_uint64(devc->capture_ratio);
 243                 break;
 244         case SR_CONF_LIMIT_SAMPLES:
 245                 *data = g_variant_new_uint64(devc->limit_samples);
 246                 break;
 247         case SR_CONF_PATTERN_MODE:
 248                 if (devc->flag_reg & FLAG_EXTERNAL_TEST_MODE)
 249                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
 250                 else if (devc->flag_reg & FLAG_INTERNAL_TEST_MODE)
 251                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
 252                 else
 253                         *data = g_variant_new_string(STR_PATTERN_NONE);
 254                 break;
 255         case SR_CONF_RLE:
 256                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_RLE ? TRUE : FALSE);
 257                 break;
 258         default:
 259                 return SR_ERR_NA;
 260         }
 261
 262         return SR_OK;
 263 }
 264
 265 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 266                 const struct sr_channel_group *cg)
 267 {
 268         struct dev_context *devc;
 269         uint16_t flag;
 270         uint64_t tmp_u64;
 271         int ret;
 272         const char *stropt;
 273
 274         (void)cg;
 275
 276         if (sdi->status != SR_ST_ACTIVE)
 277                 return SR_ERR_DEV_CLOSED;
 278
 279         devc = sdi->priv;
 280
 281         switch (key) {
 282         case SR_CONF_SAMPLERATE:
 283                 tmp_u64 = g_variant_get_uint64(data);
 284                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
 285                         return SR_ERR_SAMPLERATE;
 286                 ret = ols_set_samplerate(sdi, g_variant_get_uint64(data));
 287                 break;
 288         case SR_CONF_LIMIT_SAMPLES:
 289                 tmp_u64 = g_variant_get_uint64(data);
 290                 if (tmp_u64 < MIN_NUM_SAMPLES)
 291                         return SR_ERR;
 292                 devc->limit_samples = tmp_u64;
 293                 ret = SR_OK;
 294                 break;
 295         case SR_CONF_CAPTURE_RATIO:
 296                 devc->capture_ratio = g_variant_get_uint64(data);
 297                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100) {
 298                         devc->capture_ratio = 0;
 299                         ret = SR_ERR;
 300                 } else
 301                         ret = SR_OK;
 302                 break;
 303         case SR_CONF_EXTERNAL_CLOCK:
 304                 if (g_variant_get_boolean(data)) {
 305                         sr_info("Enabling external clock.");
 306                         devc->flag_reg |= FLAG_CLOCK_EXTERNAL;
 307                 } else {
 308                         sr_info("Disabled external clock.");
 309                         devc->flag_reg &= ~FLAG_CLOCK_EXTERNAL;
 310                 }
 311                 ret = SR_OK;
 312                 break;
 313         case SR_CONF_PATTERN_MODE:
 314                 stropt = g_variant_get_string(data, NULL);
 315                 ret = SR_OK;
 316                 flag = 0xffff;
 317                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
 318                         sr_info("Disabling test modes.");
 319                         flag = 0x0000;
 320                 }else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
 321                         sr_info("Enabling internal test mode.");
 322                         flag = FLAG_INTERNAL_TEST_MODE;
 323                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
 324                         sr_info("Enabling external test mode.");
 325                         flag = FLAG_EXTERNAL_TEST_MODE;
 326                 } else {
 327                         ret = SR_ERR;
 328                 }
 329                 if (flag != 0xffff) {
 330                         devc->flag_reg &= ~(FLAG_INTERNAL_TEST_MODE | FLAG_EXTERNAL_TEST_MODE);
 331                         devc->flag_reg |= flag;
 332                 }
 333                 break;
 334         case SR_CONF_SWAP:
 335                 if (g_variant_get_boolean(data)) {
 336                         sr_info("Enabling channel swapping.");
 337                         devc->flag_reg |= FLAG_SWAP_CHANNELS;
 338                 } else {
 339                         sr_info("Disabling channel swapping.");
 340                         devc->flag_reg &= ~FLAG_SWAP_CHANNELS;
 341                 }
 342                 ret = SR_OK;
 343                 break;
 344
 345         case SR_CONF_RLE:
 346                 if (g_variant_get_boolean(data)) {
 347                         sr_info("Enabling RLE.");
 348                         devc->flag_reg |= FLAG_RLE;
 349                 } else {
 350                         sr_info("Disabling RLE.");
 351                         devc->flag_reg &= ~FLAG_RLE;
 352                 }
 353                 ret = SR_OK;
 354                 break;
 355         default:
 356                 ret = SR_ERR_NA;
 357         }
 358
 359         return ret;
 360 }
 361
 362 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 363                 const struct sr_channel_group *cg)
 364 {
 365         struct dev_context *devc;
 366         GVariant *gvar, *grange[2];
 367         GVariantBuilder gvb;
 368         int num_ols_changrp, i;
 369
 370         (void)cg;
 371
 372         switch (key) {
 373         case SR_CONF_SCAN_OPTIONS:
 374                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 375                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 376                 break;
 377         case SR_CONF_DEVICE_OPTIONS:
 378                 if (!sdi)
 379                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 380                                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 381                 else
 382                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 383                                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 384                 break;
 385         case SR_CONF_SAMPLERATE:
 386                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 387                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 388                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 389                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 390                 *data = g_variant_builder_end(&gvb);
 391                 break;
 392         case SR_CONF_TRIGGER_MATCH:
 393                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 394                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 395                                 sizeof(int32_t));
 396                 break;
 397         case SR_CONF_PATTERN_MODE:
 398                 *data = g_variant_new_strv(patterns, ARRAY_SIZE(patterns));
 399                 break;
 400         case SR_CONF_LIMIT_SAMPLES:
 401                 if (!sdi)
 402                         return SR_ERR_ARG;
 403                 devc = sdi->priv;
 404                 if (devc->flag_reg & FLAG_RLE)
 405                         return SR_ERR_NA;
 406                 if (devc->max_samples == 0)
 407                         /* Device didn't specify sample memory size in metadata. */
 408                         return SR_ERR_NA;
 409                 /*
 410                  * Channel groups are turned off if no channels in that group are
 411                  * enabled, making more room for samples for the enabled group.
 412                 */
 413                 ols_channel_mask(sdi);
 414                 num_ols_changrp = 0;
 415                 for (i = 0; i < 4; i++) {
 416                         if (devc->channel_mask & (0xff << (i * 8)))
 417                                 num_ols_changrp++;
 418                 }
 419                 grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 420                 if (num_ols_changrp)
 421                         grange[1] = g_variant_new_uint64(devc->max_samples / num_ols_changrp);
 422                 else
 423                         grange[1] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 424                 *data = g_variant_new_tuple(grange, 2);
 425                 break;
 426         default:
 427                 return SR_ERR_NA;
 428         }
 429
 430         return SR_OK;
 431 }
 432
 433 static int set_trigger(const struct sr_dev_inst *sdi, int stage)
 434 {
 435         struct dev_context *devc;
 436         struct sr_serial_dev_inst *serial;
 437         uint8_t cmd, arg[4];
 438
 439         devc = sdi->priv;
 440         serial = sdi->conn;
 441
 442         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 443         arg[0] = devc->trigger_mask[stage] & 0xff;
 444         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
 445         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
 446         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
 447         if (send_longcommand(serial, cmd, arg) != SR_OK)
 448                 return SR_ERR;
 449
 450         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 451         arg[0] = devc->trigger_value[stage] & 0xff;
 452         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
 453         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
 454         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
 455         if (send_longcommand(serial, cmd, arg) != SR_OK)
 456                 return SR_ERR;
 457
 458         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 459         arg[0] = arg[1] = arg[3] = 0x00;
 460         arg[2] = stage;
 461         if (stage == devc->num_stages)
 462                 /* Last stage, fire when this one matches. */
 463                 arg[3] |= TRIGGER_START;
 464         if (send_longcommand(serial, cmd, arg) != SR_OK)
 465                 return SR_ERR;
 466
 467         return SR_OK;
 468 }
 469
 470 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 471                 void *cb_data)
 472 {
 473         struct dev_context *devc;
 474         struct sr_serial_dev_inst *serial;
 475         uint16_t samplecount, readcount, delaycount;
 476         uint8_t ols_changrp_mask, arg[4];
 477         int num_ols_changrp;
 478         int ret, i;
 479
 480         if (sdi->status != SR_ST_ACTIVE)
 481                 return SR_ERR_DEV_CLOSED;
 482
 483         devc = sdi->priv;
 484         serial = sdi->conn;
 485
 486         ols_channel_mask(sdi);
 487
 488         num_ols_changrp = 0;
 489         ols_changrp_mask = 0;
 490         for (i = 0; i < 4; i++) {
 491                 if (devc->channel_mask & (0xff << (i * 8))) {
 492                         ols_changrp_mask |= (1 << i);
 493                         num_ols_changrp++;
 494                 }
 495         }
 496
 497         /*
 498          * Limit readcount to prevent reading past the end of the hardware
 499          * buffer.
 500          */
 501         samplecount = MIN(devc->max_samples / num_ols_changrp, devc->limit_samples);
 502         readcount = samplecount / 4;
 503
 504         /* Rather read too many samples than too few. */
 505         if (samplecount % 4 != 0)
 506                 readcount++;
 507
 508         /* Basic triggers. */
 509         if (ols_convert_trigger(sdi) != SR_OK) {
 510                 sr_err("Failed to configure channels.");
 511                 return SR_ERR;
 512         }
 513         if (devc->num_stages > 0) {
 514                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 515                 devc->trigger_at = (readcount - delaycount) * 4 - devc->num_stages;
 516                 for (i = 0; i <= devc->num_stages; i++) {
 517                         sr_dbg("Setting OLS stage %d trigger.", i);
 518                         if ((ret = set_trigger(sdi, i)) != SR_OK)
 519                                 return ret;
 520                 }
 521         } else {
 522                 /* No triggers configured, force trigger on first stage. */
 523                 sr_dbg("Forcing trigger at stage 0.");
 524                 if ((ret = set_trigger(sdi, 0)) != SR_OK)
 525                         return ret;
 526                 delaycount = readcount;
 527         }
 528
 529         /* Samplerate. */
 530         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 531                         devc->cur_samplerate, devc->cur_samplerate_divider);
 532         arg[0] = devc->cur_samplerate_divider & 0xff;
 533         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 534         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 535         arg[3] = 0x00;
 536         if (send_longcommand(serial, CMD_SET_DIVIDER, arg) != SR_OK)
 537                 return SR_ERR;
 538
 539         /* Send sample limit and pre/post-trigger capture ratio. */
 540         sr_dbg("Setting sample limit %d, trigger point at %d",
 541                         (readcount - 1) * 4, (delaycount - 1) * 4);
 542         arg[0] = ((readcount - 1) & 0xff);
 543         arg[1] = ((readcount - 1) & 0xff00) >> 8;
 544         arg[2] = ((delaycount - 1) & 0xff);
 545         arg[3] = ((delaycount - 1) & 0xff00) >> 8;
 546         if (send_longcommand(serial, CMD_CAPTURE_SIZE, arg) != SR_OK)
 547                 return SR_ERR;
 548
 549         /* Flag register. */
 550         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
 551                         devc->flag_reg & FLAG_INTERNAL_TEST_MODE ? "on": "off",
 552                         devc->flag_reg & FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 553                         devc->flag_reg & FLAG_RLE ? "on" : "off",
 554                         devc->flag_reg & FLAG_FILTER ? "on": "off",
 555                         devc->flag_reg & FLAG_DEMUX ? "on" : "off");
 556         /*
 557          * Enable/disable OLS channel groups in the flag register according
 558          * to the channel mask. 1 means "disable channel".
 559          */
 560         devc->flag_reg |= ~(ols_changrp_mask << 2) & 0x3c;
 561         arg[0] = devc->flag_reg & 0xff;
 562         arg[1] = devc->flag_reg >> 8;
 563         arg[2] = arg[3] = 0x00;
 564         if (send_longcommand(serial, CMD_SET_FLAGS, arg) != SR_OK)
 565                 return SR_ERR;
 566
 567         /* Start acquisition on the device. */
 568         if (send_shortcommand(serial, CMD_RUN) != SR_OK)
 569                 return SR_ERR;
 570
 571         /* Reset all operational states. */
 572         devc->rle_count = devc->num_transfers = 0;
 573         devc->num_samples = devc->num_bytes = 0;
 574         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
 575         memset(devc->sample, 0, 4);
 576
 577         /* Send header packet to the session bus. */
 578         std_session_send_df_header(cb_data, LOG_PREFIX);
 579
 580         serial_source_add(sdi->session, serial, G_IO_IN, -1,
 581                         ols_receive_data, cb_data);
 582
 583         return SR_OK;
 584 }
 585
 586 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 587 {
 588         (void)cb_data;
 589
 590         abort_acquisition(sdi);
 591
 592         return SR_OK;
 593 }
 594
 595 SR_PRIV struct sr_dev_driver ols_driver_info = {
 596         .name = "ols",
 597         .longname = "Openbench Logic Sniffer",
 598         .api_version = 1,
 599         .init = init,
 600         .cleanup = cleanup,
 601         .scan = scan,
 602         .dev_list = dev_list,
 603         .dev_clear = NULL,
 604         .config_get = config_get,
 605         .config_set = config_set,
 606         .config_list = config_list,
 607         .dev_open = std_serial_dev_open,
 608         .dev_close = std_serial_dev_close,
 609         .dev_acquisition_start = dev_acquisition_start,
 610         .dev_acquisition_stop = dev_acquisition_stop,
 611         .context = NULL,
 612 };