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 "protocol.h"
  21 #include <libserialport.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 SR_PRIV struct sr_dev_driver ols_driver_info;
  87
  88 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  89 {
  90         return std_init(sr_ctx, di, LOG_PREFIX);
  91 }
  92
  93 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  94 {
  95         struct sr_config *src;
  96         struct sr_dev_inst *sdi;
  97         struct drv_context *drvc;
  98         struct dev_context *devc;
  99         struct sr_serial_dev_inst *serial;
 100         GSList *l, *devices;
 101         int ret, i;
 102         const char *conn, *serialcomm;
 103         char buf[8];
 104
 105         drvc = di->priv;
 106
 107         devices = NULL;
 108
 109         conn = serialcomm = NULL;
 110         for (l = options; l; l = l->next) {
 111                 src = l->data;
 112                 switch (src->key) {
 113                 case SR_CONF_CONN:
 114                         conn = g_variant_get_string(src->data, NULL);
 115                         break;
 116                 case SR_CONF_SERIALCOMM:
 117                         serialcomm = g_variant_get_string(src->data, NULL);
 118                         break;
 119                 }
 120         }
 121         if (!conn)
 122                 return NULL;
 123
 124         if (serialcomm == NULL)
 125                 serialcomm = SERIALCOMM;
 126
 127         serial = sr_serial_dev_inst_new(conn, serialcomm);
 128
 129         /* The discovery procedure is like this: first send the Reset
 130          * command (0x00) 5 times, since the device could be anywhere
 131          * in a 5-byte command. Then send the ID command (0x02).
 132          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 133          * have a match.
 134          */
 135         sr_info("Probing %s.", conn);
 136         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
 137                 return NULL;
 138
 139         ret = SR_OK;
 140         for (i = 0; i < 5; i++) {
 141                 if ((ret = send_shortcommand(serial, CMD_RESET)) != SR_OK) {
 142                         sr_err("Port %s is not writable.", conn);
 143                         break;
 144                 }
 145         }
 146         if (ret != SR_OK) {
 147                 serial_close(serial);
 148                 sr_err("Could not use port %s. Quitting.", conn);
 149                 return NULL;
 150         }
 151         send_shortcommand(serial, CMD_ID);
 152
 153         /* Wait 10ms for a response. */
 154         g_usleep(10000);
 155
 156         if (sp_input_waiting(serial->data) == 0) {
 157                 sr_dbg("Didn't get any reply.");
 158                 return NULL;
 159         }
 160
 161         ret = serial_read_blocking(serial, buf, 4, serial_timeout(serial, 4));
 162         if (ret != 4) {
 163                 sr_err("Invalid reply (expected 4 bytes, got %d).", ret);
 164                 return NULL;
 165         }
 166
 167         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4)) {
 168                 sr_err("Invalid reply (expected '1SLO' or '1ALS', got "
 169                        "'%c%c%c%c').", buf[0], buf[1], buf[2], buf[3]);
 170                 return NULL;
 171         }
 172
 173         /* Definitely using the OLS protocol, check if it supports
 174          * the metadata command.
 175          */
 176         send_shortcommand(serial, CMD_METADATA);
 177
 178         /* Wait 10ms for a response. */
 179         g_usleep(10000);
 180
 181         if (sp_input_waiting(serial->data) != 0) {
 182                 /* Got metadata. */
 183                 sdi = get_metadata(serial);
 184                 devc = sdi->priv;
 185         } else {
 186                 /* Not an OLS -- some other board that uses the sump protocol. */
 187                 sr_info("Device does not support metadata.");
 188                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 189                 sdi->status = SR_ST_INACTIVE;
 190                 sdi->vendor = g_strdup("Sump");
 191                 sdi->model = g_strdup("Logic Analyzer");
 192                 sdi->version = g_strdup("v1.0");
 193                 sdi->driver = di;
 194                 for (i = 0; i < 32; i++)
 195                         sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 196                                         ols_channel_names[i]);
 197                 devc = ols_dev_new();
 198                 sdi->priv = devc;
 199         }
 200         /* Configure samplerate and divider. */
 201         if (ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
 202                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
 203                                 DEFAULT_SAMPLERATE);
 204         sdi->inst_type = SR_INST_SERIAL;
 205         sdi->conn = serial;
 206
 207         drvc->instances = g_slist_append(drvc->instances, sdi);
 208         devices = g_slist_append(devices, sdi);
 209
 210         serial_close(serial);
 211
 212         return devices;
 213 }
 214
 215 static GSList *dev_list(const struct sr_dev_driver *di)
 216 {
 217         return ((struct drv_context *)(di->priv))->instances;
 218 }
 219
 220 static int cleanup(const struct sr_dev_driver *di)
 221 {
 222         return std_dev_clear(di, NULL);
 223 }
 224
 225 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 226                 const struct sr_channel_group *cg)
 227 {
 228         struct dev_context *devc;
 229
 230         (void)cg;
 231
 232         if (!sdi)
 233                 return SR_ERR_ARG;
 234
 235         devc = sdi->priv;
 236         switch (key) {
 237         case SR_CONF_SAMPLERATE:
 238                 *data = g_variant_new_uint64(devc->cur_samplerate);
 239                 break;
 240         case SR_CONF_CAPTURE_RATIO:
 241                 *data = g_variant_new_uint64(devc->capture_ratio);
 242                 break;
 243         case SR_CONF_LIMIT_SAMPLES:
 244                 *data = g_variant_new_uint64(devc->limit_samples);
 245                 break;
 246         case SR_CONF_PATTERN_MODE:
 247                 if (devc->flag_reg & FLAG_EXTERNAL_TEST_MODE)
 248                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
 249                 else if (devc->flag_reg & FLAG_INTERNAL_TEST_MODE)
 250                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
 251                 else
 252                         *data = g_variant_new_string(STR_PATTERN_NONE);
 253                 break;
 254         case SR_CONF_RLE:
 255                 *data = g_variant_new_boolean(devc->flag_reg & FLAG_RLE ? TRUE : FALSE);
 256                 break;
 257         default:
 258                 return SR_ERR_NA;
 259         }
 260
 261         return SR_OK;
 262 }
 263
 264 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 265                 const struct sr_channel_group *cg)
 266 {
 267         struct dev_context *devc;
 268         uint16_t flag;
 269         uint64_t tmp_u64;
 270         int ret;
 271         const char *stropt;
 272
 273         (void)cg;
 274
 275         if (sdi->status != SR_ST_ACTIVE)
 276                 return SR_ERR_DEV_CLOSED;
 277
 278         devc = sdi->priv;
 279
 280         switch (key) {
 281         case SR_CONF_SAMPLERATE:
 282                 tmp_u64 = g_variant_get_uint64(data);
 283                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
 284                         return SR_ERR_SAMPLERATE;
 285                 ret = ols_set_samplerate(sdi, g_variant_get_uint64(data));
 286                 break;
 287         case SR_CONF_LIMIT_SAMPLES:
 288                 tmp_u64 = g_variant_get_uint64(data);
 289                 if (tmp_u64 < MIN_NUM_SAMPLES)
 290                         return SR_ERR;
 291                 devc->limit_samples = tmp_u64;
 292                 ret = SR_OK;
 293                 break;
 294         case SR_CONF_CAPTURE_RATIO:
 295                 devc->capture_ratio = g_variant_get_uint64(data);
 296                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100) {
 297                         devc->capture_ratio = 0;
 298                         ret = SR_ERR;
 299                 } else
 300                         ret = SR_OK;
 301                 break;
 302         case SR_CONF_EXTERNAL_CLOCK:
 303                 if (g_variant_get_boolean(data)) {
 304                         sr_info("Enabling external clock.");
 305                         devc->flag_reg |= FLAG_CLOCK_EXTERNAL;
 306                 } else {
 307                         sr_info("Disabled external clock.");
 308                         devc->flag_reg &= ~FLAG_CLOCK_EXTERNAL;
 309                 }
 310                 ret = SR_OK;
 311                 break;
 312         case SR_CONF_PATTERN_MODE:
 313                 stropt = g_variant_get_string(data, NULL);
 314                 ret = SR_OK;
 315                 flag = 0xffff;
 316                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
 317                         sr_info("Disabling test modes.");
 318                         flag = 0x0000;
 319                 }else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
 320                         sr_info("Enabling internal test mode.");
 321                         flag = FLAG_INTERNAL_TEST_MODE;
 322                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
 323                         sr_info("Enabling external test mode.");
 324                         flag = FLAG_EXTERNAL_TEST_MODE;
 325                 } else {
 326                         ret = SR_ERR;
 327                 }
 328                 if (flag != 0xffff) {
 329                         devc->flag_reg &= ~(FLAG_INTERNAL_TEST_MODE | FLAG_EXTERNAL_TEST_MODE);
 330                         devc->flag_reg |= flag;
 331                 }
 332                 break;
 333         case SR_CONF_SWAP:
 334                 if (g_variant_get_boolean(data)) {
 335                         sr_info("Enabling channel swapping.");
 336                         devc->flag_reg |= FLAG_SWAP_CHANNELS;
 337                 } else {
 338                         sr_info("Disabling channel swapping.");
 339                         devc->flag_reg &= ~FLAG_SWAP_CHANNELS;
 340                 }
 341                 ret = SR_OK;
 342                 break;
 343
 344         case SR_CONF_RLE:
 345                 if (g_variant_get_boolean(data)) {
 346                         sr_info("Enabling RLE.");
 347                         devc->flag_reg |= FLAG_RLE;
 348                 } else {
 349                         sr_info("Disabling RLE.");
 350                         devc->flag_reg &= ~FLAG_RLE;
 351                 }
 352                 ret = SR_OK;
 353                 break;
 354         default:
 355                 ret = SR_ERR_NA;
 356         }
 357
 358         return ret;
 359 }
 360
 361 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 362                 const struct sr_channel_group *cg)
 363 {
 364         struct dev_context *devc;
 365         GVariant *gvar, *grange[2];
 366         GVariantBuilder gvb;
 367         int num_ols_changrp, i;
 368
 369         (void)cg;
 370
 371         switch (key) {
 372         case SR_CONF_SCAN_OPTIONS:
 373                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 374                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 375                 break;
 376         case SR_CONF_DEVICE_OPTIONS:
 377                 if (!sdi)
 378                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 379                                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 380                 else
 381                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 382                                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 383                 break;
 384         case SR_CONF_SAMPLERATE:
 385                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 386                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
 387                                 ARRAY_SIZE(samplerates), sizeof(uint64_t));
 388                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 389                 *data = g_variant_builder_end(&gvb);
 390                 break;
 391         case SR_CONF_TRIGGER_MATCH:
 392                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 393                                 trigger_matches, ARRAY_SIZE(trigger_matches),
 394                                 sizeof(int32_t));
 395                 break;
 396         case SR_CONF_PATTERN_MODE:
 397                 *data = g_variant_new_strv(patterns, ARRAY_SIZE(patterns));
 398                 break;
 399         case SR_CONF_LIMIT_SAMPLES:
 400                 if (!sdi)
 401                         return SR_ERR_ARG;
 402                 devc = sdi->priv;
 403                 if (devc->flag_reg & FLAG_RLE)
 404                         return SR_ERR_NA;
 405                 if (devc->max_samples == 0)
 406                         /* Device didn't specify sample memory size in metadata. */
 407                         return SR_ERR_NA;
 408                 /*
 409                  * Channel groups are turned off if no channels in that group are
 410                  * enabled, making more room for samples for the enabled group.
 411                 */
 412                 ols_channel_mask(sdi);
 413                 num_ols_changrp = 0;
 414                 for (i = 0; i < 4; i++) {
 415                         if (devc->channel_mask & (0xff << (i * 8)))
 416                                 num_ols_changrp++;
 417                 }
 418                 grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 419                 if (num_ols_changrp)
 420                         grange[1] = g_variant_new_uint64(devc->max_samples / num_ols_changrp);
 421                 else
 422                         grange[1] = g_variant_new_uint64(MIN_NUM_SAMPLES);
 423                 *data = g_variant_new_tuple(grange, 2);
 424                 break;
 425         default:
 426                 return SR_ERR_NA;
 427         }
 428
 429         return SR_OK;
 430 }
 431
 432 static int set_trigger(const struct sr_dev_inst *sdi, int stage)
 433 {
 434         struct dev_context *devc;
 435         struct sr_serial_dev_inst *serial;
 436         uint8_t cmd, arg[4];
 437
 438         devc = sdi->priv;
 439         serial = sdi->conn;
 440
 441         cmd = CMD_SET_TRIGGER_MASK + stage * 4;
 442         arg[0] = devc->trigger_mask[stage] & 0xff;
 443         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
 444         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
 445         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
 446         if (send_longcommand(serial, cmd, arg) != SR_OK)
 447                 return SR_ERR;
 448
 449         cmd = CMD_SET_TRIGGER_VALUE + stage * 4;
 450         arg[0] = devc->trigger_value[stage] & 0xff;
 451         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
 452         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
 453         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
 454         if (send_longcommand(serial, cmd, arg) != SR_OK)
 455                 return SR_ERR;
 456
 457         cmd = CMD_SET_TRIGGER_CONFIG + stage * 4;
 458         arg[0] = arg[1] = arg[3] = 0x00;
 459         arg[2] = stage;
 460         if (stage == devc->num_stages)
 461                 /* Last stage, fire when this one matches. */
 462                 arg[3] |= TRIGGER_START;
 463         if (send_longcommand(serial, cmd, arg) != SR_OK)
 464                 return SR_ERR;
 465
 466         return SR_OK;
 467 }
 468
 469 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 470                 void *cb_data)
 471 {
 472         struct dev_context *devc;
 473         struct sr_serial_dev_inst *serial;
 474         uint16_t samplecount, readcount, delaycount;
 475         uint8_t ols_changrp_mask, arg[4];
 476         int num_ols_changrp;
 477         int ret, i;
 478
 479         if (sdi->status != SR_ST_ACTIVE)
 480                 return SR_ERR_DEV_CLOSED;
 481
 482         devc = sdi->priv;
 483         serial = sdi->conn;
 484
 485         ols_channel_mask(sdi);
 486
 487         num_ols_changrp = 0;
 488         ols_changrp_mask = 0;
 489         for (i = 0; i < 4; i++) {
 490                 if (devc->channel_mask & (0xff << (i * 8))) {
 491                         ols_changrp_mask |= (1 << i);
 492                         num_ols_changrp++;
 493                 }
 494         }
 495
 496         /*
 497          * Limit readcount to prevent reading past the end of the hardware
 498          * buffer.
 499          */
 500         samplecount = MIN(devc->max_samples / num_ols_changrp, devc->limit_samples);
 501         readcount = samplecount / 4;
 502
 503         /* Rather read too many samples than too few. */
 504         if (samplecount % 4 != 0)
 505                 readcount++;
 506
 507         /* Basic triggers. */
 508         if (ols_convert_trigger(sdi) != SR_OK) {
 509                 sr_err("Failed to configure channels.");
 510                 return SR_ERR;
 511         }
 512         if (devc->num_stages > 0) {
 513                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 514                 devc->trigger_at = (readcount - delaycount) * 4 - devc->num_stages;
 515                 for (i = 0; i <= devc->num_stages; i++) {
 516                         sr_dbg("Setting OLS stage %d trigger.", i);
 517                         if ((ret = set_trigger(sdi, i)) != SR_OK)
 518                                 return ret;
 519                 }
 520         } else {
 521                 /* No triggers configured, force trigger on first stage. */
 522                 sr_dbg("Forcing trigger at stage 0.");
 523                 if ((ret = set_trigger(sdi, 0)) != SR_OK)
 524                         return ret;
 525                 delaycount = readcount;
 526         }
 527
 528         /* Samplerate. */
 529         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 530                         devc->cur_samplerate, devc->cur_samplerate_divider);
 531         arg[0] = devc->cur_samplerate_divider & 0xff;
 532         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 533         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 534         arg[3] = 0x00;
 535         if (send_longcommand(serial, CMD_SET_DIVIDER, arg) != SR_OK)
 536                 return SR_ERR;
 537
 538         /* Send sample limit and pre/post-trigger capture ratio. */
 539         sr_dbg("Setting sample limit %d, trigger point at %d",
 540                         (readcount - 1) * 4, (delaycount - 1) * 4);
 541         arg[0] = ((readcount - 1) & 0xff);
 542         arg[1] = ((readcount - 1) & 0xff00) >> 8;
 543         arg[2] = ((delaycount - 1) & 0xff);
 544         arg[3] = ((delaycount - 1) & 0xff00) >> 8;
 545         if (send_longcommand(serial, CMD_CAPTURE_SIZE, arg) != SR_OK)
 546                 return SR_ERR;
 547
 548         /* Flag register. */
 549         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
 550                         devc->flag_reg & FLAG_INTERNAL_TEST_MODE ? "on": "off",
 551                         devc->flag_reg & FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 552                         devc->flag_reg & FLAG_RLE ? "on" : "off",
 553                         devc->flag_reg & FLAG_FILTER ? "on": "off",
 554                         devc->flag_reg & FLAG_DEMUX ? "on" : "off");
 555         /*
 556          * Enable/disable OLS channel groups in the flag register according
 557          * to the channel mask. 1 means "disable channel".
 558          */
 559         devc->flag_reg |= ~(ols_changrp_mask << 2) & 0x3c;
 560         arg[0] = devc->flag_reg & 0xff;
 561         arg[1] = devc->flag_reg >> 8;
 562         arg[2] = arg[3] = 0x00;
 563         if (send_longcommand(serial, CMD_SET_FLAGS, arg) != SR_OK)
 564                 return SR_ERR;
 565
 566         /* Start acquisition on the device. */
 567         if (send_shortcommand(serial, CMD_RUN) != SR_OK)
 568                 return SR_ERR;
 569
 570         /* Reset all operational states. */
 571         devc->rle_count = devc->num_transfers = 0;
 572         devc->num_samples = devc->num_bytes = 0;
 573         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
 574         memset(devc->sample, 0, 4);
 575
 576         /* Send header packet to the session bus. */
 577         std_session_send_df_header(cb_data, LOG_PREFIX);
 578
 579         serial_source_add(sdi->session, serial, G_IO_IN, -1,
 580                         ols_receive_data, cb_data);
 581
 582         return SR_OK;
 583 }
 584
 585 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 586 {
 587         (void)cb_data;
 588
 589         abort_acquisition(sdi);
 590
 591         return SR_OK;
 592 }
 593
 594 SR_PRIV struct sr_dev_driver ols_driver_info = {
 595         .name = "ols",
 596         .longname = "Openbench Logic Sniffer",
 597         .api_version = 1,
 598         .init = init,
 599         .cleanup = cleanup,
 600         .scan = scan,
 601         .dev_list = dev_list,
 602         .dev_clear = NULL,
 603         .config_get = config_get,
 604         .config_set = config_set,
 605         .config_list = config_list,
 606         .dev_open = std_serial_dev_open,
 607         .dev_close = std_serial_dev_close,
 608         .dev_acquisition_start = dev_acquisition_start,
 609         .dev_acquisition_stop = dev_acquisition_stop,
 610         .priv = NULL,
 611 };