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 scanopts[] = {
  26         SR_CONF_CONN,
  27         SR_CONF_SERIALCOMM,
  28 };
  29
  30 static const uint32_t drvopts[] = {
  31         SR_CONF_LOGIC_ANALYZER,
  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 (20 * 1000)
  87
  88 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  89 {
  90         struct sr_config *src;
  91         struct sr_dev_inst *sdi;
  92         struct sr_serial_dev_inst *serial;
  93         GSList *l;
  94         int num_read;
  95         unsigned int i;
  96         const char *conn, *serialcomm;
  97         char buf[4] = { 0, 0, 0, 0 };
  98
  99         conn = serialcomm = NULL;
 100         for (l = options; l; l = l->next) {
 101                 src = l->data;
 102                 switch (src->key) {
 103                 case SR_CONF_CONN:
 104                         conn = g_variant_get_string(src->data, NULL);
 105                         break;
 106                 case SR_CONF_SERIALCOMM:
 107                         serialcomm = g_variant_get_string(src->data, NULL);
 108                         break;
 109                 }
 110         }
 111         if (!conn)
 112                 return NULL;
 113
 114         if (!serialcomm)
 115                 serialcomm = SERIALCOMM;
 116
 117         serial = sr_serial_dev_inst_new(conn, serialcomm);
 118
 119         /* The discovery procedure is like this: first send the Reset
 120          * command (0x00) 5 times, since the device could be anywhere
 121          * in a 5-byte command. Then send the ID command (0x02).
 122          * If the device responds with 4 bytes ("OLS1" or "SLA1"), we
 123          * have a match.
 124          */
 125         sr_info("Probing %s.", conn);
 126         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
 127                 return NULL;
 128
 129         if (ols_send_reset(serial) != SR_OK) {
 130                 serial_close(serial);
 131                 sr_err("Could not use port %s. Quitting.", conn);
 132                 return NULL;
 133         }
 134         send_shortcommand(serial, CMD_ID);
 135
 136         g_usleep(RESPONSE_DELAY_US);
 137
 138         if (serial_has_receive_data(serial) == 0) {
 139                 sr_dbg("Didn't get any ID reply.");
 140                 return NULL;
 141         }
 142
 143         num_read = serial_read_blocking(serial, buf, 4, serial_timeout(serial, 4));
 144         if (num_read < 0) {
 145                 sr_err("Getting ID reply failed (%d).", num_read);
 146                 return NULL;
 147         }
 148
 149         if (strncmp(buf, "1SLO", 4) && strncmp(buf, "1ALS", 4)) {
 150                 GString *id = sr_hexdump_new((uint8_t *)buf, num_read);
 151
 152                 sr_err("Invalid ID reply (got %s).", id->str);
 153
 154                 sr_hexdump_free(id);
 155                 return NULL;
 156         }
 157
 158         /* Definitely using the OLS protocol, check if it supports
 159          * the metadata command.
 160          */
 161         send_shortcommand(serial, CMD_METADATA);
 162
 163         g_usleep(RESPONSE_DELAY_US);
 164
 165         if (serial_has_receive_data(serial) != 0) {
 166                 /* Got metadata. */
 167                 sdi = get_metadata(serial);
 168         } else {
 169                 /* Not an OLS -- some other board that uses the sump protocol. */
 170                 sr_info("Device does not support metadata.");
 171                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
 172                 sdi->status = SR_ST_INACTIVE;
 173                 sdi->vendor = g_strdup("Sump");
 174                 sdi->model = g_strdup("Logic Analyzer");
 175                 sdi->version = g_strdup("v1.0");
 176                 for (i = 0; i < ARRAY_SIZE(ols_channel_names); i++)
 177                         sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 178                                         ols_channel_names[i]);
 179                 sdi->priv = ols_dev_new();
 180         }
 181         /* Configure samplerate and divider. */
 182         if (ols_set_samplerate(sdi, DEFAULT_SAMPLERATE) != SR_OK)
 183                 sr_dbg("Failed to set default samplerate (%"PRIu64").",
 184                                 DEFAULT_SAMPLERATE);
 185         sdi->inst_type = SR_INST_SERIAL;
 186         sdi->conn = serial;
 187
 188         serial_close(serial);
 189
 190         return std_scan_complete(di, g_slist_append(NULL, sdi));
 191 }
 192
 193 static int config_get(uint32_t key, GVariant **data,
 194         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 195 {
 196         struct dev_context *devc;
 197
 198         (void)cg;
 199
 200         if (!sdi)
 201                 return SR_ERR_ARG;
 202
 203         devc = sdi->priv;
 204
 205         switch (key) {
 206         case SR_CONF_SAMPLERATE:
 207                 *data = g_variant_new_uint64(devc->cur_samplerate);
 208                 break;
 209         case SR_CONF_CAPTURE_RATIO:
 210                 *data = g_variant_new_uint64(devc->capture_ratio);
 211                 break;
 212         case SR_CONF_LIMIT_SAMPLES:
 213                 *data = g_variant_new_uint64(devc->limit_samples);
 214                 break;
 215         case SR_CONF_PATTERN_MODE:
 216                 if (devc->capture_flags & CAPTURE_FLAG_EXTERNAL_TEST_MODE)
 217                         *data = g_variant_new_string(STR_PATTERN_EXTERNAL);
 218                 else if (devc->capture_flags & CAPTURE_FLAG_INTERNAL_TEST_MODE)
 219                         *data = g_variant_new_string(STR_PATTERN_INTERNAL);
 220                 else
 221                         *data = g_variant_new_string(STR_PATTERN_NONE);
 222                 break;
 223         case SR_CONF_RLE:
 224                 *data = g_variant_new_boolean(devc->capture_flags & CAPTURE_FLAG_RLE ? TRUE : FALSE);
 225                 break;
 226         default:
 227                 return SR_ERR_NA;
 228         }
 229
 230         return SR_OK;
 231 }
 232
 233 static int config_set(uint32_t key, GVariant *data,
 234         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 235 {
 236         struct dev_context *devc;
 237         uint16_t flag;
 238         uint64_t tmp_u64;
 239         const char *stropt;
 240
 241         (void)cg;
 242
 243         devc = sdi->priv;
 244
 245         switch (key) {
 246         case SR_CONF_SAMPLERATE:
 247                 tmp_u64 = g_variant_get_uint64(data);
 248                 if (tmp_u64 < samplerates[0] || tmp_u64 > samplerates[1])
 249                         return SR_ERR_SAMPLERATE;
 250                 return ols_set_samplerate(sdi, g_variant_get_uint64(data));
 251         case SR_CONF_LIMIT_SAMPLES:
 252                 tmp_u64 = g_variant_get_uint64(data);
 253                 if (tmp_u64 < MIN_NUM_SAMPLES)
 254                         return SR_ERR;
 255                 devc->limit_samples = tmp_u64;
 256                 break;
 257         case SR_CONF_CAPTURE_RATIO:
 258                 devc->capture_ratio = g_variant_get_uint64(data);
 259                 break;
 260         case SR_CONF_EXTERNAL_CLOCK:
 261                 if (g_variant_get_boolean(data)) {
 262                         sr_info("Enabling external clock.");
 263                         devc->capture_flags |= CAPTURE_FLAG_CLOCK_EXTERNAL;
 264                 } else {
 265                         sr_info("Disabled external clock.");
 266                         devc->capture_flags &= ~CAPTURE_FLAG_CLOCK_EXTERNAL;
 267                 }
 268                 break;
 269         case SR_CONF_PATTERN_MODE:
 270                 stropt = g_variant_get_string(data, NULL);
 271                 if (!strcmp(stropt, STR_PATTERN_NONE)) {
 272                         sr_info("Disabling test modes.");
 273                         flag = 0x0000;
 274                 } else if (!strcmp(stropt, STR_PATTERN_INTERNAL)) {
 275                         sr_info("Enabling internal test mode.");
 276                         flag = CAPTURE_FLAG_INTERNAL_TEST_MODE;
 277                 } else if (!strcmp(stropt, STR_PATTERN_EXTERNAL)) {
 278                         sr_info("Enabling external test mode.");
 279                         flag = CAPTURE_FLAG_EXTERNAL_TEST_MODE;
 280                 } else {
 281                         return SR_ERR;
 282                 }
 283                 devc->capture_flags &= ~CAPTURE_FLAG_INTERNAL_TEST_MODE;
 284                 devc->capture_flags &= ~CAPTURE_FLAG_EXTERNAL_TEST_MODE;
 285                 devc->capture_flags |= flag;
 286                 break;
 287         case SR_CONF_SWAP:
 288                 if (g_variant_get_boolean(data)) {
 289                         sr_info("Enabling channel swapping.");
 290                         devc->capture_flags |= CAPTURE_FLAG_SWAP_CHANNELS;
 291                 } else {
 292                         sr_info("Disabling channel swapping.");
 293                         devc->capture_flags &= ~CAPTURE_FLAG_SWAP_CHANNELS;
 294                 }
 295                 break;
 296         case SR_CONF_RLE:
 297                 if (g_variant_get_boolean(data)) {
 298                         sr_info("Enabling RLE.");
 299                         devc->capture_flags |= CAPTURE_FLAG_RLE;
 300                 } else {
 301                         sr_info("Disabling RLE.");
 302                         devc->capture_flags &= ~CAPTURE_FLAG_RLE;
 303                 }
 304                 break;
 305         default:
 306                 return SR_ERR_NA;
 307         }
 308
 309         return SR_OK;
 310 }
 311
 312 static int config_list(uint32_t key, GVariant **data,
 313         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 314 {
 315         struct dev_context *devc;
 316         int num_ols_changrp, i;
 317
 318         switch (key) {
 319         case SR_CONF_SCAN_OPTIONS:
 320         case SR_CONF_DEVICE_OPTIONS:
 321                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 322         case SR_CONF_SAMPLERATE:
 323                 *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 324                 break;
 325         case SR_CONF_TRIGGER_MATCH:
 326                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 327                 break;
 328         case SR_CONF_PATTERN_MODE:
 329                 *data = g_variant_new_strv(ARRAY_AND_SIZE(patterns));
 330                 break;
 331         case SR_CONF_LIMIT_SAMPLES:
 332                 if (!sdi)
 333                         return SR_ERR_ARG;
 334                 devc = sdi->priv;
 335                 if (devc->capture_flags & CAPTURE_FLAG_RLE)
 336                         return SR_ERR_NA;
 337                 if (devc->max_samples == 0)
 338                         /* Device didn't specify sample memory size in metadata. */
 339                         return SR_ERR_NA;
 340                 /*
 341                  * Channel groups are turned off if no channels in that group are
 342                  * enabled, making more room for samples for the enabled group.
 343                 */
 344                 ols_channel_mask(sdi);
 345                 num_ols_changrp = 0;
 346                 for (i = 0; i < 4; i++) {
 347                         if (devc->channel_mask & (0xff << (i * 8)))
 348                                 num_ols_changrp++;
 349                 }
 350
 351                 *data = std_gvar_tuple_u64(MIN_NUM_SAMPLES,
 352                         (num_ols_changrp) ? devc->max_samples / num_ols_changrp : MIN_NUM_SAMPLES);
 353                 break;
 354         default:
 355                 return SR_ERR_NA;
 356         }
 357
 358         return SR_OK;
 359 }
 360
 361 static int set_basic_trigger(const struct sr_dev_inst *sdi, int stage)
 362 {
 363         struct dev_context *devc;
 364         struct sr_serial_dev_inst *serial;
 365         uint8_t cmd, arg[4];
 366
 367         devc = sdi->priv;
 368         serial = sdi->conn;
 369
 370         cmd = CMD_SET_BASIC_TRIGGER_MASK0 + stage * 4;
 371         arg[0] = devc->trigger_mask[stage] & 0xff;
 372         arg[1] = (devc->trigger_mask[stage] >> 8) & 0xff;
 373         arg[2] = (devc->trigger_mask[stage] >> 16) & 0xff;
 374         arg[3] = (devc->trigger_mask[stage] >> 24) & 0xff;
 375         if (send_longcommand(serial, cmd, arg) != SR_OK)
 376                 return SR_ERR;
 377
 378         cmd = CMD_SET_BASIC_TRIGGER_VALUE0 + stage * 4;
 379         arg[0] = devc->trigger_value[stage] & 0xff;
 380         arg[1] = (devc->trigger_value[stage] >> 8) & 0xff;
 381         arg[2] = (devc->trigger_value[stage] >> 16) & 0xff;
 382         arg[3] = (devc->trigger_value[stage] >> 24) & 0xff;
 383         if (send_longcommand(serial, cmd, arg) != SR_OK)
 384                 return SR_ERR;
 385
 386         cmd = CMD_SET_BASIC_TRIGGER_CONFIG0 + stage * 4;
 387         arg[0] = arg[1] = arg[3] = 0x00;
 388         arg[2] = stage;
 389         if (stage == devc->num_stages)
 390                 /* Last stage, fire when this one matches. */
 391                 arg[3] |= TRIGGER_START;
 392         if (send_longcommand(serial, cmd, arg) != SR_OK)
 393                 return SR_ERR;
 394
 395         return SR_OK;
 396 }
 397
 398 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 399 {
 400         struct dev_context *devc;
 401         struct sr_serial_dev_inst *serial;
 402         uint32_t samplecount, readcount, delaycount;
 403         uint8_t ols_changrp_mask, arg[4];
 404         int num_ols_changrp;
 405         int ret, i;
 406
 407         devc = sdi->priv;
 408         serial = sdi->conn;
 409
 410         ols_channel_mask(sdi);
 411
 412         num_ols_changrp = 0;
 413         ols_changrp_mask = 0;
 414         for (i = 0; i < 4; i++) {
 415                 if (devc->channel_mask & (0xff << (i * 8))) {
 416                         ols_changrp_mask |= (1 << i);
 417                         num_ols_changrp++;
 418                 }
 419         }
 420
 421         /*
 422          * Limit readcount to prevent reading past the end of the hardware
 423          * buffer. Rather read too many samples than too few.
 424          */
 425         samplecount = MIN(devc->max_samples / num_ols_changrp, devc->limit_samples);
 426         readcount = (samplecount + 3) / 4;
 427
 428         /* Basic triggers. */
 429         if (ols_convert_trigger(sdi) != SR_OK) {
 430                 sr_err("Failed to configure channels.");
 431                 return SR_ERR;
 432         }
 433         if (devc->num_stages > 0) {
 434                 /*
 435                  * According to http://mygizmos.org/ols/Logic-Sniffer-FPGA-Spec.pdf
 436                  * reset command must be send prior each arm command
 437                  */
 438                 sr_dbg("Send reset command before trigger configure");
 439                 if (ols_send_reset(serial) != SR_OK)
 440                         return SR_ERR;
 441
 442                 delaycount = readcount * (1 - devc->capture_ratio / 100.0);
 443                 devc->trigger_at_smpl = (readcount - delaycount) * 4 - devc->num_stages;
 444                 for (i = 0; i <= devc->num_stages; i++) {
 445                         sr_dbg("Setting OLS stage %d trigger.", i);
 446                         if ((ret = set_basic_trigger(sdi, i)) != SR_OK)
 447                                 return ret;
 448                 }
 449         } else {
 450                 /* No triggers configured, force trigger on first stage. */
 451                 sr_dbg("Forcing trigger at stage 0.");
 452                 if ((ret = set_basic_trigger(sdi, 0)) != SR_OK)
 453                         return ret;
 454                 delaycount = readcount;
 455         }
 456
 457         /* Samplerate. */
 458         sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
 459                         devc->cur_samplerate, devc->cur_samplerate_divider);
 460         arg[0] = devc->cur_samplerate_divider & 0xff;
 461         arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
 462         arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
 463         arg[3] = 0x00;
 464         if (send_longcommand(serial, CMD_SET_DIVIDER, arg) != SR_OK)
 465                 return SR_ERR;
 466
 467         /* Send sample limit and pre/post-trigger capture ratio. */
 468         sr_dbg("Setting sample limit %d, trigger point at %d",
 469                         (readcount - 1) * 4, (delaycount - 1) * 4);
 470
 471         if (devc->max_samples > 256 * 1024) {
 472                 arg[0] = ((readcount - 1) & 0xff);
 473                 arg[1] = ((readcount - 1) & 0xff00) >> 8;
 474                 arg[2] = ((readcount - 1) & 0xff0000) >> 16;
 475                 arg[3] = ((readcount - 1) & 0xff000000) >> 24;
 476                 if (send_longcommand(serial, CMD_CAPTURE_READCOUNT, arg) != SR_OK)
 477                         return SR_ERR;
 478                 arg[0] = ((delaycount - 1) & 0xff);
 479                 arg[1] = ((delaycount - 1) & 0xff00) >> 8;
 480                 arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
 481                 arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
 482                 if (send_longcommand(serial, CMD_CAPTURE_DELAYCOUNT, arg) != SR_OK)
 483                         return SR_ERR;
 484         } else {
 485                 arg[0] = ((readcount - 1) & 0xff);
 486                 arg[1] = ((readcount - 1) & 0xff00) >> 8;
 487                 arg[2] = ((delaycount - 1) & 0xff);
 488                 arg[3] = ((delaycount - 1) & 0xff00) >> 8;
 489                 if (send_longcommand(serial, CMD_CAPTURE_SIZE, arg) != SR_OK)
 490                         return SR_ERR;
 491         }
 492
 493         /* Flag register. */
 494         sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s",
 495                         devc->capture_flags & CAPTURE_FLAG_INTERNAL_TEST_MODE ? "on": "off",
 496                         devc->capture_flags & CAPTURE_FLAG_EXTERNAL_TEST_MODE ? "on": "off",
 497                         devc->capture_flags & CAPTURE_FLAG_RLE ? "on" : "off",
 498                         devc->capture_flags & CAPTURE_FLAG_NOISE_FILTER ? "on": "off",
 499                         devc->capture_flags & CAPTURE_FLAG_DEMUX ? "on" : "off");
 500
 501         /*
 502          * Enable/disable OLS channel groups in the flag register according
 503          * to the channel mask. 1 means "disable channel".
 504          */
 505         devc->capture_flags &= ~0x3c;
 506         devc->capture_flags |= ~(ols_changrp_mask << 2) & 0x3c;
 507
 508         /* RLE mode is always zero, for now. */
 509
 510         arg[0] = devc->capture_flags & 0xff;
 511         arg[1] = devc->capture_flags >> 8;
 512         arg[2] = arg[3] = 0x00;
 513         if (send_longcommand(serial, CMD_SET_FLAGS, arg) != SR_OK)
 514                 return SR_ERR;
 515
 516         /* Start acquisition on the device. */
 517         if (send_shortcommand(serial, CMD_ARM_BASIC_TRIGGER) != SR_OK)
 518                 return SR_ERR;
 519
 520         /* Reset all operational states. */
 521         devc->rle_count = devc->num_transfers = 0;
 522         devc->num_samples = devc->num_bytes = 0;
 523         devc->cnt_bytes = devc->cnt_samples = devc->cnt_samples_rle = 0;
 524         memset(devc->sample, 0, 4);
 525
 526         std_session_send_df_header(sdi);
 527
 528         /* If the device stops sending for longer than it takes to send a byte,
 529          * that means it's finished. But wait at least 100 ms to be safe.
 530          */
 531         serial_source_add(sdi->session, serial, G_IO_IN, 100,
 532                         ols_receive_data, (struct sr_dev_inst *)sdi);
 533
 534         return SR_OK;
 535 }
 536
 537 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 538 {
 539         abort_acquisition(sdi);
 540
 541         return SR_OK;
 542 }
 543
 544 static struct sr_dev_driver ols_driver_info = {
 545         .name = "ols",
 546         .longname = "Openbench Logic Sniffer & SUMP compatibles",
 547         .api_version = 1,
 548         .init = std_init,
 549         .cleanup = std_cleanup,
 550         .scan = scan,
 551         .dev_list = std_dev_list,
 552         .dev_clear = std_dev_clear,
 553         .config_get = config_get,
 554         .config_set = config_set,
 555         .config_list = config_list,
 556         .dev_open = std_serial_dev_open,
 557         .dev_close = std_serial_dev_close,
 558         .dev_acquisition_start = dev_acquisition_start,
 559         .dev_acquisition_stop = dev_acquisition_stop,
 560         .context = NULL,
 561 };
 562 SR_REGISTER_DEV_DRIVER(ols_driver_info);