src/hardware/demo/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
   5  * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
   6  * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
   7  * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <config.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <math.h>
  27 #include <libsigrok/libsigrok.h>
  28 #include "libsigrok-internal.h"
  29 #include "protocol.h"
  30
  31 #define DEFAULT_NUM_LOGIC_CHANNELS      8
  32 #define DEFAULT_LOGIC_PATTERN           PATTERN_SIGROK
  33
  34 #define DEFAULT_NUM_ANALOG_CHANNELS     4
  35 #define DEFAULT_ANALOG_AMPLITUDE        10
  36
  37 /* Note: No spaces allowed because of sigrok-cli. */
  38 static const char *logic_pattern_str[] = {
  39         "sigrok",
  40         "random",
  41         "incremental",
  42         "walking-one",
  43         "walking-zero",
  44         "all-low",
  45         "all-high",
  46         "squid",
  47         "graycode",
  48 };
  49
  50 static const uint32_t scanopts[] = {
  51         SR_CONF_NUM_LOGIC_CHANNELS,
  52         SR_CONF_NUM_ANALOG_CHANNELS,
  53         SR_CONF_LIMIT_FRAMES,
  54 };
  55
  56 static const uint32_t drvopts[] = {
  57         SR_CONF_DEMO_DEV,
  58         SR_CONF_LOGIC_ANALYZER,
  59         SR_CONF_OSCILLOSCOPE,
  60 };
  61
  62 static const uint32_t devopts[] = {
  63         SR_CONF_CONTINUOUS,
  64         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  65         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  66         SR_CONF_LIMIT_FRAMES | SR_CONF_GET | SR_CONF_SET,
  67         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  68         SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET,
  69         SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  70         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  71         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  72 };
  73
  74 static const uint32_t devopts_cg_logic[] = {
  75         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  76 };
  77
  78 static const uint32_t devopts_cg_analog_group[] = {
  79         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  80 };
  81
  82 static const uint32_t devopts_cg_analog_channel[] = {
  83         SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  84         SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
  85 };
  86
  87 static const int32_t trigger_matches[] = {
  88         SR_TRIGGER_ZERO,
  89         SR_TRIGGER_ONE,
  90         SR_TRIGGER_RISING,
  91         SR_TRIGGER_FALLING,
  92         SR_TRIGGER_EDGE,
  93 };
  94
  95 static const uint64_t samplerates[] = {
  96         SR_HZ(1),
  97         SR_GHZ(1),
  98         SR_HZ(1),
  99 };
 100
 101 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 102 {
 103         struct dev_context *devc;
 104         struct sr_dev_inst *sdi;
 105         struct sr_channel *ch;
 106         struct sr_channel_group *cg, *acg;
 107         struct sr_config *src;
 108         struct analog_gen *ag;
 109         GSList *l;
 110         int num_logic_channels, num_analog_channels, pattern, i;
 111         uint64_t limit_frames;
 112         char channel_name[16];
 113
 114         num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
 115         num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
 116         limit_frames = DEFAULT_LIMIT_FRAMES;
 117         for (l = options; l; l = l->next) {
 118                 src = l->data;
 119                 switch (src->key) {
 120                 case SR_CONF_NUM_LOGIC_CHANNELS:
 121                         num_logic_channels = g_variant_get_int32(src->data);
 122                         break;
 123                 case SR_CONF_NUM_ANALOG_CHANNELS:
 124                         num_analog_channels = g_variant_get_int32(src->data);
 125                         break;
 126                 case SR_CONF_LIMIT_FRAMES:
 127                         limit_frames = g_variant_get_uint64(src->data);
 128                         break;
 129                 }
 130         }
 131
 132         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 133         sdi->status = SR_ST_INACTIVE;
 134         sdi->model = g_strdup("Demo device");
 135
 136         devc = g_malloc0(sizeof(struct dev_context));
 137         devc->cur_samplerate = SR_KHZ(200);
 138         devc->num_logic_channels = num_logic_channels;
 139         devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
 140         devc->all_logic_channels_mask = 1UL << 0;
 141         devc->all_logic_channels_mask <<= devc->num_logic_channels;
 142         devc->all_logic_channels_mask--;
 143         devc->logic_pattern = DEFAULT_LOGIC_PATTERN;
 144         devc->num_analog_channels = num_analog_channels;
 145         devc->limit_frames = limit_frames;
 146         devc->capture_ratio = 20;
 147         devc->stl = NULL;
 148
 149         if (num_logic_channels > 0) {
 150                 /* Logic channels, all in one channel group. */
 151                 cg = g_malloc0(sizeof(struct sr_channel_group));
 152                 cg->name = g_strdup("Logic");
 153                 for (i = 0; i < num_logic_channels; i++) {
 154                         sprintf(channel_name, "D%d", i);
 155                         ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
 156                         cg->channels = g_slist_append(cg->channels, ch);
 157                 }
 158                 sdi->channel_groups = g_slist_append(NULL, cg);
 159         }
 160
 161         /* Analog channels, channel groups and pattern generators. */
 162         devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
 163         if (num_analog_channels > 0) {
 164                 pattern = 0;
 165                 /* An "Analog" channel group with all analog channels in it. */
 166                 acg = g_malloc0(sizeof(struct sr_channel_group));
 167                 acg->name = g_strdup("Analog");
 168                 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
 169
 170                 for (i = 0; i < num_analog_channels; i++) {
 171                         snprintf(channel_name, 16, "A%d", i);
 172                         ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
 173                                         TRUE, channel_name);
 174                         acg->channels = g_slist_append(acg->channels, ch);
 175
 176                         /* Every analog channel gets its own channel group as well. */
 177                         cg = g_malloc0(sizeof(struct sr_channel_group));
 178                         cg->name = g_strdup(channel_name);
 179                         cg->channels = g_slist_append(NULL, ch);
 180                         sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 181
 182                         /* Every channel gets a generator struct. */
 183                         ag = g_malloc(sizeof(struct analog_gen));
 184                         ag->ch = ch;
 185                         ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
 186                         sr_analog_init(&ag->packet, &ag->encoding, &ag->meaning, &ag->spec, 2);
 187                         ag->packet.meaning->channels = cg->channels;
 188                         ag->packet.meaning->mq = 0;
 189                         ag->packet.meaning->mqflags = 0;
 190                         ag->packet.meaning->unit = SR_UNIT_VOLT;
 191                         ag->packet.data = ag->pattern_data;
 192                         ag->pattern = pattern;
 193                         ag->avg_val = 0.0f;
 194                         ag->num_avgs = 0;
 195                         g_hash_table_insert(devc->ch_ag, ch, ag);
 196
 197                         if (++pattern == ARRAY_SIZE(analog_pattern_str))
 198                                 pattern = 0;
 199                 }
 200         }
 201
 202         sdi->priv = devc;
 203
 204         return std_scan_complete(di, g_slist_append(NULL, sdi));
 205 }
 206
 207 static void clear_helper(struct dev_context *devc)
 208 {
 209         GHashTableIter iter;
 210         void *value;
 211
 212         /* Analog generators. */
 213         g_hash_table_iter_init(&iter, devc->ch_ag);
 214         while (g_hash_table_iter_next(&iter, NULL, &value))
 215                 g_free(value);
 216         g_hash_table_unref(devc->ch_ag);
 217 }
 218
 219 static int dev_clear(const struct sr_dev_driver *di)
 220 {
 221         return std_dev_clear_with_callback(di, (std_dev_clear_callback)clear_helper);
 222 }
 223
 224 static int config_get(uint32_t key, GVariant **data,
 225         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 226 {
 227         struct dev_context *devc;
 228         struct sr_channel *ch;
 229         struct analog_gen *ag;
 230         int pattern;
 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_LIMIT_SAMPLES:
 241                 *data = g_variant_new_uint64(devc->limit_samples);
 242                 break;
 243         case SR_CONF_LIMIT_MSEC:
 244                 *data = g_variant_new_uint64(devc->limit_msec);
 245                 break;
 246         case SR_CONF_LIMIT_FRAMES:
 247                 *data = g_variant_new_uint64(devc->limit_frames);
 248                 break;
 249         case SR_CONF_AVERAGING:
 250                 *data = g_variant_new_boolean(devc->avg);
 251                 break;
 252         case SR_CONF_AVG_SAMPLES:
 253                 *data = g_variant_new_uint64(devc->avg_samples);
 254                 break;
 255         case SR_CONF_PATTERN_MODE:
 256                 if (!cg)
 257                         return SR_ERR_CHANNEL_GROUP;
 258                 /* Any channel in the group will do. */
 259                 ch = cg->channels->data;
 260                 if (ch->type == SR_CHANNEL_LOGIC) {
 261                         pattern = devc->logic_pattern;
 262                         *data = g_variant_new_string(logic_pattern_str[pattern]);
 263                 } else if (ch->type == SR_CHANNEL_ANALOG) {
 264                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 265                         pattern = ag->pattern;
 266                         *data = g_variant_new_string(analog_pattern_str[pattern]);
 267                 } else
 268                         return SR_ERR_BUG;
 269                 break;
 270         case SR_CONF_AMPLITUDE:
 271                 if (!cg)
 272                         return SR_ERR_CHANNEL_GROUP;
 273                 /* Any channel in the group will do. */
 274                 ch = cg->channels->data;
 275                 if (ch->type != SR_CHANNEL_ANALOG)
 276                         return SR_ERR_ARG;
 277                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 278                 *data = g_variant_new_double(ag->amplitude);
 279                 break;
 280         case SR_CONF_CAPTURE_RATIO:
 281                 *data = g_variant_new_uint64(devc->capture_ratio);
 282                 break;
 283         default:
 284                 return SR_ERR_NA;
 285         }
 286
 287         return SR_OK;
 288 }
 289
 290 static int config_set(uint32_t key, GVariant *data,
 291         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 292 {
 293         struct dev_context *devc;
 294         struct analog_gen *ag;
 295         struct sr_channel *ch;
 296         GSList *l;
 297         int logic_pattern, analog_pattern;
 298
 299         devc = sdi->priv;
 300
 301         switch (key) {
 302         case SR_CONF_SAMPLERATE:
 303                 devc->cur_samplerate = g_variant_get_uint64(data);
 304                 break;
 305         case SR_CONF_LIMIT_SAMPLES:
 306                 devc->limit_msec = 0;
 307                 devc->limit_samples = g_variant_get_uint64(data);
 308                 break;
 309         case SR_CONF_LIMIT_MSEC:
 310                 devc->limit_msec = g_variant_get_uint64(data);
 311                 devc->limit_samples = 0;
 312                 break;
 313         case SR_CONF_LIMIT_FRAMES:
 314                 devc->limit_frames = g_variant_get_uint64(data);
 315                 break;
 316         case SR_CONF_AVERAGING:
 317                 devc->avg = g_variant_get_boolean(data);
 318                 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
 319                 break;
 320         case SR_CONF_AVG_SAMPLES:
 321                 devc->avg_samples = g_variant_get_uint64(data);
 322                 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
 323                 break;
 324         case SR_CONF_PATTERN_MODE:
 325                 if (!cg)
 326                         return SR_ERR_CHANNEL_GROUP;
 327                 logic_pattern = std_str_idx(data, ARRAY_AND_SIZE(logic_pattern_str));
 328                 analog_pattern = std_str_idx(data, ARRAY_AND_SIZE(analog_pattern_str));
 329                 if (logic_pattern < 0 && analog_pattern < 0)
 330                         return SR_ERR_ARG;
 331                 for (l = cg->channels; l; l = l->next) {
 332                         ch = l->data;
 333                         if (ch->type == SR_CHANNEL_LOGIC) {
 334                                 if (logic_pattern == -1)
 335                                         return SR_ERR_ARG;
 336                                 sr_dbg("Setting logic pattern to %s",
 337                                                 logic_pattern_str[logic_pattern]);
 338                                 devc->logic_pattern = logic_pattern;
 339                                 /* Might as well do this now, these are static. */
 340                                 if (logic_pattern == PATTERN_ALL_LOW)
 341                                         memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
 342                                 else if (logic_pattern == PATTERN_ALL_HIGH)
 343                                         memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
 344                         } else if (ch->type == SR_CHANNEL_ANALOG) {
 345                                 if (analog_pattern == -1)
 346                                         return SR_ERR_ARG;
 347                                 sr_dbg("Setting analog pattern for channel %s to %s",
 348                                                 ch->name, analog_pattern_str[analog_pattern]);
 349                                 ag = g_hash_table_lookup(devc->ch_ag, ch);
 350                                 ag->pattern = analog_pattern;
 351                         } else
 352                                 return SR_ERR_BUG;
 353                 }
 354                 break;
 355         case SR_CONF_AMPLITUDE:
 356                 if (!cg)
 357                         return SR_ERR_CHANNEL_GROUP;
 358                 for (l = cg->channels; l; l = l->next) {
 359                         ch = l->data;
 360                         if (ch->type != SR_CHANNEL_ANALOG)
 361                                 return SR_ERR_ARG;
 362                         ag = g_hash_table_lookup(devc->ch_ag, ch);
 363                         ag->amplitude = g_variant_get_double(data);
 364                 }
 365                 break;
 366         case SR_CONF_CAPTURE_RATIO:
 367                 devc->capture_ratio = g_variant_get_uint64(data);
 368                 break;
 369         default:
 370                 return SR_ERR_NA;
 371         }
 372
 373         return SR_OK;
 374 }
 375
 376 static int config_list(uint32_t key, GVariant **data,
 377         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 378 {
 379         struct sr_channel *ch;
 380
 381         if (!cg) {
 382                 switch (key) {
 383                 case SR_CONF_SCAN_OPTIONS:
 384                 case SR_CONF_DEVICE_OPTIONS:
 385                         return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 386                 case SR_CONF_SAMPLERATE:
 387                         *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 388                         break;
 389                 case SR_CONF_TRIGGER_MATCH:
 390                         *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 391                         break;
 392                 default:
 393                         return SR_ERR_NA;
 394                 }
 395         } else {
 396                 ch = cg->channels->data;
 397                 switch (key) {
 398                 case SR_CONF_DEVICE_OPTIONS:
 399                         if (ch->type == SR_CHANNEL_LOGIC)
 400                                 *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_logic));
 401                         else if (ch->type == SR_CHANNEL_ANALOG) {
 402                                 if (strcmp(cg->name, "Analog") == 0)
 403                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_group));
 404                                 else
 405                                         *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_analog_channel));
 406                         }
 407                         else
 408                                 return SR_ERR_BUG;
 409                         break;
 410                 case SR_CONF_PATTERN_MODE:
 411                         /* The analog group (with all 4 channels) shall not have a pattern property. */
 412                         if (strcmp(cg->name, "Analog") == 0)
 413                                 return SR_ERR_NA;
 414
 415                         if (ch->type == SR_CHANNEL_LOGIC)
 416                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(logic_pattern_str));
 417                         else if (ch->type == SR_CHANNEL_ANALOG)
 418                                 *data = g_variant_new_strv(ARRAY_AND_SIZE(analog_pattern_str));
 419                         else
 420                                 return SR_ERR_BUG;
 421                         break;
 422                 default:
 423                         return SR_ERR_NA;
 424                 }
 425         }
 426
 427         return SR_OK;
 428 }
 429
 430 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 431 {
 432         struct dev_context *devc;
 433         GSList *l;
 434         struct sr_channel *ch;
 435         int bitpos;
 436         uint8_t mask;
 437         GHashTableIter iter;
 438         void *value;
 439         struct sr_trigger *trigger;
 440
 441         devc = sdi->priv;
 442         devc->sent_samples = 0;
 443         devc->sent_frame_samples = 0;
 444
 445         /* Setup triggers */
 446         if ((trigger = sr_session_trigger_get(sdi->session))) {
 447                 int pre_trigger_samples = 0;
 448                 if (devc->limit_samples > 0)
 449                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 450                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 451                 if (!devc->stl)
 452                         return SR_ERR_MALLOC;
 453
 454                 /* Disable all analog channels since using them when there are logic
 455                  * triggers set up would require having pre-trigger sample buffers
 456                  * for analog sample data.
 457                  */
 458                 for (l = sdi->channels; l; l = l->next) {
 459                         ch = l->data;
 460                         if (ch->type == SR_CHANNEL_ANALOG)
 461                                 ch->enabled = FALSE;
 462                 }
 463         }
 464         devc->trigger_fired = FALSE;
 465
 466         /*
 467          * Determine the numbers of logic and analog channels that are
 468          * involved in the acquisition. Determine an offset and a mask to
 469          * remove excess logic data content before datafeed submission.
 470          */
 471         devc->enabled_logic_channels = 0;
 472         devc->enabled_analog_channels = 0;
 473         for (l = sdi->channels; l; l = l->next) {
 474                 ch = l->data;
 475                 if (!ch->enabled)
 476                         continue;
 477                 if (ch->type == SR_CHANNEL_ANALOG) {
 478                         devc->enabled_analog_channels++;
 479                         continue;
 480                 }
 481                 if (ch->type != SR_CHANNEL_LOGIC)
 482                         continue;
 483                 /*
 484                  * TODO: Need we create a channel map here, such that the
 485                  * session datafeed packets will have a dense representation
 486                  * of the enabled channels' data? For example store channels
 487                  * D3 and D5 in bit positions 0 and 1 respectively, when all
 488                  * other channels are disabled? The current implementation
 489                  * generates a sparse layout, might provide data for logic
 490                  * channels that are disabled while it might suppress data
 491                  * from enabled channels at the same time.
 492                  */
 493                 devc->enabled_logic_channels++;
 494         }
 495         devc->first_partial_logic_index = devc->enabled_logic_channels / 8;
 496         bitpos = devc->enabled_logic_channels % 8;
 497         mask = (1 << bitpos) - 1;
 498         devc->first_partial_logic_mask = mask;
 499         sr_dbg("num logic %zu, partial off %zu, mask 0x%02x.",
 500                 devc->enabled_logic_channels,
 501                 devc->first_partial_logic_index,
 502                 devc->first_partial_logic_mask);
 503
 504         /*
 505          * Have the waveform for analog patterns pre-generated. It's
 506          * supposed to be periodic, so the generator just needs to
 507          * access the prepared sample data (DDS style).
 508          */
 509         g_hash_table_iter_init(&iter, devc->ch_ag);
 510         while (g_hash_table_iter_next(&iter, NULL, &value))
 511                 demo_generate_analog_pattern(value, devc->cur_samplerate);
 512
 513         sr_session_source_add(sdi->session, -1, 0, 100,
 514                         demo_prepare_data, (struct sr_dev_inst *)sdi);
 515
 516         std_session_send_df_header(sdi);
 517
 518         if (devc->limit_frames > 0)
 519                 std_session_send_frame_begin(sdi);
 520
 521         /* We use this timestamp to decide how many more samples to send. */
 522         devc->start_us = g_get_monotonic_time();
 523         devc->spent_us = 0;
 524         devc->step = 0;
 525
 526         return SR_OK;
 527 }
 528
 529 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 530 {
 531         struct dev_context *devc;
 532
 533         sr_session_source_remove(sdi->session, -1);
 534
 535         devc = sdi->priv;
 536         if (devc->limit_frames > 0)
 537                 std_session_send_frame_end(sdi);
 538
 539         std_session_send_df_end(sdi);
 540
 541         if (devc->stl) {
 542                 soft_trigger_logic_free(devc->stl);
 543                 devc->stl = NULL;
 544         }
 545
 546         return SR_OK;
 547 }
 548
 549 static struct sr_dev_driver demo_driver_info = {
 550         .name = "demo",
 551         .longname = "Demo driver and pattern generator",
 552         .api_version = 1,
 553         .init = std_init,
 554         .cleanup = std_cleanup,
 555         .scan = scan,
 556         .dev_list = std_dev_list,
 557         .dev_clear = dev_clear,
 558         .config_get = config_get,
 559         .config_set = config_set,
 560         .config_list = config_list,
 561         .dev_open = std_dummy_dev_open,
 562         .dev_close = std_dummy_dev_close,
 563         .dev_acquisition_start = dev_acquisition_start,
 564         .dev_acquisition_stop = dev_acquisition_stop,
 565         .context = NULL,
 566 };
 567 SR_REGISTER_DEV_DRIVER(demo_driver_info);