src/lcr/es51919.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Janne Huttunen <jahuttun@gmail.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 <stdint.h>
  21 #include <string.h>
  22 #include <math.h>
  23 #include <glib.h>
  24 #include <libsigrok/libsigrok.h>
  25 #include "libsigrok-internal.h"
  26
  27 #define LOG_PREFIX "es51919"
  28
  29 struct dev_buffer {
  30         /** Total size of the buffer. */
  31         size_t size;
  32         /** Amount of data currently in the buffer. */
  33         size_t len;
  34         /** Offset where the data starts in the buffer. */
  35         size_t offset;
  36         /** Space for the data. */
  37         uint8_t data[];
  38 };
  39
  40 static struct dev_buffer *dev_buffer_new(size_t size)
  41 {
  42         struct dev_buffer *dbuf;
  43
  44         dbuf = g_malloc0(sizeof(struct dev_buffer) + size);
  45         dbuf->size = size;
  46         dbuf->len = 0;
  47         dbuf->offset = 0;
  48
  49         return dbuf;
  50 }
  51
  52 static void dev_buffer_destroy(struct dev_buffer *dbuf)
  53 {
  54         g_free(dbuf);
  55 }
  56
  57 static int dev_buffer_fill_serial(struct dev_buffer *dbuf,
  58                                   struct sr_dev_inst *sdi)
  59 {
  60         struct sr_serial_dev_inst *serial;
  61         int len;
  62
  63         serial = sdi->conn;
  64
  65         /* If we already have data, move it to the beginning of the buffer. */
  66         if (dbuf->len > 0 && dbuf->offset > 0)
  67                 memmove(dbuf->data, dbuf->data + dbuf->offset, dbuf->len);
  68
  69         dbuf->offset = 0;
  70
  71         len = dbuf->size - dbuf->len;
  72         len = serial_read_nonblocking(serial, dbuf->data + dbuf->len, len);
  73         if (len < 0) {
  74                 sr_err("Serial port read error: %d.", len);
  75                 return len;
  76         }
  77
  78         dbuf->len += len;
  79
  80         return SR_OK;
  81 }
  82
  83 static uint8_t *dev_buffer_packet_find(struct dev_buffer *dbuf,
  84                                 gboolean (*packet_valid)(const uint8_t *),
  85                                 size_t packet_size)
  86 {
  87         size_t offset;
  88
  89         while (dbuf->len >= packet_size) {
  90                 if (packet_valid(dbuf->data + dbuf->offset)) {
  91                         offset = dbuf->offset;
  92                         dbuf->offset += packet_size;
  93                         dbuf->len -= packet_size;
  94                         return dbuf->data + offset;
  95                 }
  96                 dbuf->offset++;
  97                 dbuf->len--;
  98         }
  99
 100         return NULL;
 101 }
 102
 103 struct dev_limit_counter {
 104         /** The current number of received samples/frames/etc. */
 105         uint64_t count;
 106         /** The limit (in number of samples/frames/etc.). */
 107         uint64_t limit;
 108 };
 109
 110 static void dev_limit_counter_start(struct dev_limit_counter *cnt)
 111 {
 112         cnt->count = 0;
 113 }
 114
 115 static void dev_limit_counter_inc(struct dev_limit_counter *cnt)
 116 {
 117         cnt->count++;
 118 }
 119
 120 static void dev_limit_counter_limit_set(struct dev_limit_counter *cnt,
 121                                         uint64_t limit)
 122 {
 123         cnt->limit = limit;
 124 }
 125
 126 static gboolean dev_limit_counter_limit_reached(struct dev_limit_counter *cnt)
 127 {
 128         if (cnt->limit && cnt->count >= cnt->limit) {
 129                 sr_info("Requested counter limit reached.");
 130                 return TRUE;
 131         }
 132
 133         return FALSE;
 134 }
 135
 136 struct dev_time_counter {
 137         /** The starting time of current sampling run. */
 138         int64_t starttime;
 139         /** The time limit (in milliseconds). */
 140         uint64_t limit;
 141 };
 142
 143 static void dev_time_counter_start(struct dev_time_counter *cnt)
 144 {
 145         cnt->starttime = g_get_monotonic_time();
 146 }
 147
 148 static void dev_time_limit_set(struct dev_time_counter *cnt, uint64_t limit)
 149 {
 150         cnt->limit = limit;
 151 }
 152
 153 static gboolean dev_time_limit_reached(struct dev_time_counter *cnt)
 154 {
 155         int64_t time;
 156
 157         if (cnt->limit) {
 158                 time = (g_get_monotonic_time() - cnt->starttime) / 1000;
 159                 if (time > (int64_t)cnt->limit) {
 160                         sr_info("Requested time limit reached.");
 161                         return TRUE;
 162                 }
 163         }
 164
 165         return FALSE;
 166 }
 167
 168 static void serial_conf_get(GSList *options, const char *def_serialcomm,
 169                             const char **conn, const char **serialcomm)
 170 {
 171         struct sr_config *src;
 172         GSList *l;
 173
 174         *conn = *serialcomm = NULL;
 175         for (l = options; l; l = l->next) {
 176                 src = l->data;
 177                 switch (src->key) {
 178                 case SR_CONF_CONN:
 179                         *conn = g_variant_get_string(src->data, NULL);
 180                         break;
 181                 case SR_CONF_SERIALCOMM:
 182                         *serialcomm = g_variant_get_string(src->data, NULL);
 183                         break;
 184                 }
 185         }
 186
 187         if (*serialcomm == NULL)
 188                 *serialcomm = def_serialcomm;
 189 }
 190
 191 static struct sr_serial_dev_inst *serial_dev_new(GSList *options,
 192                                                  const char *def_serialcomm)
 193
 194 {
 195         const char *conn, *serialcomm;
 196
 197         serial_conf_get(options, def_serialcomm, &conn, &serialcomm);
 198
 199         if (!conn)
 200                 return NULL;
 201
 202         return sr_serial_dev_inst_new(conn, serialcomm);
 203 }
 204
 205 static int serial_stream_check_buf(struct sr_serial_dev_inst *serial,
 206                                    uint8_t *buf, size_t buflen,
 207                                    size_t packet_size,
 208                                    packet_valid_callback is_valid,
 209                                    uint64_t timeout_ms, int baudrate)
 210 {
 211         size_t len, dropped;
 212         int ret;
 213
 214         if ((ret = serial_open(serial, SERIAL_RDWR)) != SR_OK)
 215                 return ret;
 216
 217         serial_flush(serial);
 218
 219         len = buflen;
 220         ret = serial_stream_detect(serial, buf, &len, packet_size,
 221                                    is_valid, timeout_ms, baudrate);
 222
 223         serial_close(serial);
 224
 225         if (ret != SR_OK)
 226                 return ret;
 227
 228         /*
 229          * If we dropped more than two packets worth of data, something is
 230          * wrong. We shouldn't quit however, since the dropped bytes might be
 231          * just zeroes at the beginning of the stream. Those can occur as a
 232          * combination of the nonstandard cable that ships with some devices
 233          * and the serial port or USB to serial adapter.
 234          */
 235         dropped = len - packet_size;
 236         if (dropped > 2 * packet_size)
 237                 sr_warn("Had to drop too much data.");
 238
 239         return SR_OK;
 240 }
 241
 242 static int serial_stream_check(struct sr_serial_dev_inst *serial,
 243                                size_t packet_size,
 244                                packet_valid_callback is_valid,
 245                                uint64_t timeout_ms, int baudrate)
 246 {
 247         uint8_t buf[128];
 248
 249         return serial_stream_check_buf(serial, buf, sizeof(buf), packet_size,
 250                                        is_valid, timeout_ms, baudrate);
 251 }
 252
 253 struct std_opt_desc {
 254         const uint32_t *scanopts;
 255         const int num_scanopts;
 256         const uint32_t *devopts;
 257         const int num_devopts;
 258 };
 259
 260 static int std_config_list(uint32_t key, GVariant **data,
 261                            const struct std_opt_desc *d)
 262 {
 263         switch (key) {
 264         case SR_CONF_SCAN_OPTIONS:
 265                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 266                         d->scanopts, d->num_scanopts, sizeof(uint32_t));
 267                 break;
 268         case SR_CONF_DEVICE_OPTIONS:
 269                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 270                         d->devopts, d->num_devopts, sizeof(uint32_t));
 271                 break;
 272         default:
 273                 return SR_ERR_NA;
 274         }
 275
 276         return SR_OK;
 277 }
 278
 279 static int send_config_update(struct sr_dev_inst *sdi, struct sr_config *cfg)
 280 {
 281         struct sr_datafeed_packet packet;
 282         struct sr_datafeed_meta meta;
 283
 284         memset(&meta, 0, sizeof(meta));
 285
 286         packet.type = SR_DF_META;
 287         packet.payload = &meta;
 288
 289         meta.config = g_slist_append(meta.config, cfg);
 290
 291         return sr_session_send(sdi, &packet);
 292 }
 293
 294 static int send_config_update_key(struct sr_dev_inst *sdi, uint32_t key,
 295                                   GVariant *var)
 296 {
 297         struct sr_config *cfg;
 298         int ret;
 299
 300         cfg = sr_config_new(key, var);
 301         if (!cfg)
 302                 return SR_ERR;
 303
 304         ret = send_config_update(sdi, cfg);
 305         sr_config_free(cfg);
 306
 307         return ret;
 308 }
 309
 310 /*
 311  * Cyrustek ES51919 LCR chipset host protocol.
 312  *
 313  * Public official documentation does not contain the protocol
 314  * description, so this is all based on reverse engineering.
 315  *
 316  * Packet structure (17 bytes):
 317  *
 318  * 0x00: header1 ?? (0x00)
 319  * 0x01: header2 ?? (0x0d)
 320  *
 321  * 0x02: flags
 322  *         bit 0 = hold enabled
 323  *         bit 1 = reference shown (in delta mode)
 324  *         bit 2 = delta mode
 325  *         bit 3 = calibration mode
 326  *         bit 4 = sorting mode
 327  *         bit 5 = LCR mode
 328  *         bit 6 = auto mode
 329  *         bit 7 = parallel measurement (vs. serial)
 330  *
 331  * 0x03: config
 332  *         bit 0-4 = ??? (0x10)
 333  *         bit 5-7 = test frequency
 334  *                     0 = 100 Hz
 335  *                     1 = 120 Hz
 336  *                     2 = 1 kHz
 337  *                     3 = 10 kHz
 338  *                     4 = 100 kHz
 339  *                     5 = 0 Hz (DC)
 340  *
 341  * 0x04: tolerance (sorting mode)
 342  *         0 = not set
 343  *         3 = +-0.25%
 344  *         4 = +-0.5%
 345  *         5 = +-1%
 346  *         6 = +-2%
 347  *         7 = +-5%
 348  *         8 = +-10%
 349  *         9 = +-20%
 350  *        10 = -20+80%
 351  *
 352  * 0x05-0x09: primary measurement
 353  *   0x05: measured quantity
 354  *           1 = inductance
 355  *           2 = capacitance
 356  *           3 = resistance
 357  *           4 = DC resistance
 358  *   0x06: measurement MSB  (0x4e20 = 20000 = outside limits)
 359  *   0x07: measurement LSB
 360  *   0x08: measurement info
 361  *           bit 0-2 = decimal point multiplier (10^-val)
 362  *           bit 3-7 = unit
 363  *                       0 = no unit
 364  *                       1 = Ohm
 365  *                       2 = kOhm
 366  *                       3 = MOhm
 367  *                       5 = uH
 368  *                       6 = mH
 369  *                       7 = H
 370  *                       8 = kH
 371  *                       9 = pF
 372  *                       10 = nF
 373  *                       11 = uF
 374  *                       12 = mF
 375  *                       13 = %
 376  *                       14 = degree
 377  *   0x09: measurement status
 378  *           bit 0-3 = status
 379  *                       0 = normal (measurement shown)
 380  *                       1 = blank (nothing shown)
 381  *                       2 = lines ("----")
 382  *                       3 = outside limits ("OL")
 383  *                       7 = pass ("PASS")
 384  *                       8 = fail ("FAIL")
 385  *                       9 = open ("OPEn")
 386  *                      10 = shorted ("Srt")
 387  *           bit 4-6 = ??? (maybe part of same field with 0-3)
 388  *           bit 7   = ??? (some independent flag)
 389  *
 390  * 0x0a-0x0e: secondary measurement
 391  *   0x0a: measured quantity
 392  *           0 = none
 393  *           1 = dissipation factor
 394  *           2 = quality factor
 395  *           3 = parallel AC resistance / ESR
 396  *           4 = phase angle
 397  *   0x0b-0x0e: like primary measurement
 398  *
 399  * 0x0f: footer1 (0x0d) ?
 400  * 0x10: footer2 (0x0a) ?
 401  */
 402
 403 #define PACKET_SIZE 17
 404
 405 static const double frequencies[] = {
 406         100, 120, 1000, 10000, 100000, 0,
 407 };
 408
 409 enum { MODEL_NONE, MODEL_PAR, MODEL_SER, MODEL_AUTO, };
 410
 411 static const char *const models[] = {
 412         "NONE", "PARALLEL", "SERIES", "AUTO",
 413 };
 414
 415 /** Private, per-device-instance driver context. */
 416 struct dev_context {
 417         /** Opaque pointer passed in by the frontend. */
 418         void *cb_data;
 419
 420         /** The number of frames. */
 421         struct dev_limit_counter frame_count;
 422
 423         /** The time limit counter. */
 424         struct dev_time_counter time_count;
 425
 426         /** Data buffer. */
 427         struct dev_buffer *buf;
 428
 429         /** The frequency of the test signal (index to frequencies[]). */
 430         unsigned int freq;
 431
 432         /** Equivalent circuit model (index to models[]). */
 433         unsigned int model;
 434 };
 435
 436 static const uint8_t *pkt_to_buf(const uint8_t *pkt, int is_secondary)
 437 {
 438         return is_secondary ? pkt + 10 : pkt + 5;
 439 }
 440
 441 static int parse_mq(const uint8_t *pkt, int is_secondary, int is_parallel)
 442 {
 443         const uint8_t *buf;
 444
 445         buf = pkt_to_buf(pkt, is_secondary);
 446
 447         switch (is_secondary << 8 | buf[0]) {
 448         case 0x001:
 449                 return is_parallel ?
 450                         SR_MQ_PARALLEL_INDUCTANCE : SR_MQ_SERIES_INDUCTANCE;
 451         case 0x002:
 452                 return is_parallel ?
 453                         SR_MQ_PARALLEL_CAPACITANCE : SR_MQ_SERIES_CAPACITANCE;
 454         case 0x003:
 455         case 0x103:
 456                 return is_parallel ?
 457                         SR_MQ_PARALLEL_RESISTANCE : SR_MQ_SERIES_RESISTANCE;
 458         case 0x004:
 459                 return SR_MQ_RESISTANCE;
 460         case 0x100:
 461                 return SR_MQ_DIFFERENCE;
 462         case 0x101:
 463                 return SR_MQ_DISSIPATION_FACTOR;
 464         case 0x102:
 465                 return SR_MQ_QUALITY_FACTOR;
 466         case 0x104:
 467                 return SR_MQ_PHASE_ANGLE;
 468         }
 469
 470         sr_err("Unknown quantity 0x%03x.", is_secondary << 8 | buf[0]);
 471
 472         return -1;
 473 }
 474
 475 static float parse_value(const uint8_t *buf)
 476 {
 477         static const float decimals[] = {
 478                 1, 1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6, 1e-7
 479         };
 480         int16_t val;
 481
 482         val = (buf[1] << 8) | buf[2];
 483         return (float)val * decimals[buf[3] & 7];
 484 }
 485
 486 static void parse_measurement(const uint8_t *pkt, float *floatval,
 487                               struct sr_datafeed_analog *analog,
 488                               int is_secondary)
 489 {
 490         static const struct {
 491                 int unit;
 492                 float mult;
 493         } units[] = {
 494                 { SR_UNIT_UNITLESS, 1 },        /* no unit */
 495                 { SR_UNIT_OHM, 1 },             /* Ohm     */
 496                 { SR_UNIT_OHM, 1e3 },           /* kOhm    */
 497                 { SR_UNIT_OHM, 1e6 },           /* MOhm    */
 498                 { -1, 0 },                      /* ???     */
 499                 { SR_UNIT_HENRY, 1e-6 },        /* uH      */
 500                 { SR_UNIT_HENRY, 1e-3 },        /* mH      */
 501                 { SR_UNIT_HENRY, 1 },           /* H       */
 502                 { SR_UNIT_HENRY, 1e3 },         /* kH      */
 503                 { SR_UNIT_FARAD, 1e-12 },       /* pF      */
 504                 { SR_UNIT_FARAD, 1e-9 },        /* nF      */
 505                 { SR_UNIT_FARAD, 1e-6 },        /* uF      */
 506                 { SR_UNIT_FARAD, 1e-3 },        /* mF      */
 507                 { SR_UNIT_PERCENTAGE, 1 },      /* %       */
 508                 { SR_UNIT_DEGREE, 1 }           /* degree  */
 509         };
 510         const uint8_t *buf;
 511         int state;
 512
 513         buf = pkt_to_buf(pkt, is_secondary);
 514
 515         analog->mq = -1;
 516         analog->mqflags = 0;
 517
 518         state = buf[4] & 0xf;
 519
 520         if (state != 0 && state != 3)
 521                 return;
 522
 523         if (pkt[2] & 0x18) {
 524                 /* Calibration and Sorting modes not supported. */
 525                 return;
 526         }
 527
 528         if (!is_secondary) {
 529                 if (pkt[2] & 0x01)
 530                         analog->mqflags |= SR_MQFLAG_HOLD;
 531                 if (pkt[2] & 0x02)
 532                         analog->mqflags |= SR_MQFLAG_REFERENCE;
 533         } else {
 534                 if (pkt[2] & 0x04)
 535                         analog->mqflags |= SR_MQFLAG_RELATIVE;
 536         }
 537
 538         if ((analog->mq = parse_mq(pkt, is_secondary, pkt[2] & 0x80)) < 0)
 539                 return;
 540
 541         if ((buf[3] >> 3) >= ARRAY_SIZE(units)) {
 542                 sr_err("Unknown unit %u.", buf[3] >> 3);
 543                 analog->mq = -1;
 544                 return;
 545         }
 546
 547         analog->unit = units[buf[3] >> 3].unit;
 548
 549         *floatval = parse_value(buf);
 550         *floatval *= (state == 0) ? units[buf[3] >> 3].mult : INFINITY;
 551 }
 552
 553 static unsigned int parse_freq(const uint8_t *pkt)
 554 {
 555         unsigned int freq;
 556
 557         freq = pkt[3] >> 5;
 558
 559         if (freq >= ARRAY_SIZE(frequencies)) {
 560                 sr_err("Unknown frequency %u.", freq);
 561                 freq = ARRAY_SIZE(frequencies) - 1;
 562         }
 563
 564         return freq;
 565 }
 566
 567 static unsigned int parse_model(const uint8_t *pkt)
 568 {
 569         if (pkt[2] & 0x40)
 570                 return MODEL_AUTO;
 571         else if (parse_mq(pkt, 0, 0) == SR_MQ_RESISTANCE)
 572                 return MODEL_NONE;
 573         else if (pkt[2] & 0x80)
 574                 return MODEL_PAR;
 575         else
 576                 return MODEL_SER;
 577 }
 578
 579 static gboolean packet_valid(const uint8_t *pkt)
 580 {
 581         /*
 582          * If the first two bytes of the packet are indeed a constant
 583          * header, they should be checked too. Since we don't know it
 584          * for sure, we'll just check the last two for now since they
 585          * seem to be constant just like in the other Cyrustek chipset
 586          * protocols.
 587          */
 588         if (pkt[15] == 0xd && pkt[16] == 0xa)
 589                 return TRUE;
 590
 591         return FALSE;
 592 }
 593
 594 static int do_config_update(struct sr_dev_inst *sdi, uint32_t key,
 595                             GVariant *var)
 596 {
 597         struct dev_context *devc;
 598
 599         devc = sdi->priv;
 600
 601         return send_config_update_key(devc->cb_data, key, var);
 602 }
 603
 604 static int send_freq_update(struct sr_dev_inst *sdi, unsigned int freq)
 605 {
 606         return do_config_update(sdi, SR_CONF_OUTPUT_FREQUENCY,
 607                                 g_variant_new_double(frequencies[freq]));
 608 }
 609
 610 static int send_model_update(struct sr_dev_inst *sdi, unsigned int model)
 611 {
 612         return do_config_update(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL,
 613                                 g_variant_new_string(models[model]));
 614 }
 615
 616 static void handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt)
 617 {
 618         struct sr_datafeed_packet packet;
 619         struct sr_datafeed_analog analog;
 620         struct dev_context *devc;
 621         unsigned int val;
 622         float floatval;
 623         gboolean frame;
 624
 625         devc = sdi->priv;
 626
 627         val = parse_freq(pkt);
 628         if (val != devc->freq) {
 629                 if (send_freq_update(sdi, val) == SR_OK)
 630                         devc->freq = val;
 631                 else
 632                         return;
 633         }
 634
 635         val = parse_model(pkt);
 636         if (val != devc->model) {
 637                 if (send_model_update(sdi, val) == SR_OK)
 638                         devc->model = val;
 639                 else
 640                         return;
 641         }
 642
 643         frame = FALSE;
 644
 645         memset(&analog, 0, sizeof(analog));
 646
 647         analog.num_samples = 1;
 648         analog.data = &floatval;
 649
 650         analog.channels = g_slist_append(NULL, sdi->channels->data);
 651
 652         parse_measurement(pkt, &floatval, &analog, 0);
 653         if (analog.mq >= 0) {
 654                 if (!frame) {
 655                         packet.type = SR_DF_FRAME_BEGIN;
 656                         sr_session_send(devc->cb_data, &packet);
 657                         frame = TRUE;
 658                 }
 659
 660                 packet.type = SR_DF_ANALOG;
 661                 packet.payload = &analog;
 662
 663                 sr_session_send(devc->cb_data, &packet);
 664         }
 665
 666         g_slist_free(analog.channels);
 667         analog.channels = g_slist_append(NULL, sdi->channels->next->data);
 668
 669         parse_measurement(pkt, &floatval, &analog, 1);
 670         if (analog.mq >= 0) {
 671                 if (!frame) {
 672                         packet.type = SR_DF_FRAME_BEGIN;
 673                         sr_session_send(devc->cb_data, &packet);
 674                         frame = TRUE;
 675                 }
 676
 677                 packet.type = SR_DF_ANALOG;
 678                 packet.payload = &analog;
 679
 680                 sr_session_send(devc->cb_data, &packet);
 681         }
 682
 683         g_slist_free(analog.channels);
 684
 685         if (frame) {
 686                 packet.type = SR_DF_FRAME_END;
 687                 sr_session_send(devc->cb_data, &packet);
 688                 dev_limit_counter_inc(&devc->frame_count);
 689         }
 690 }
 691
 692 static int handle_new_data(struct sr_dev_inst *sdi)
 693 {
 694         struct dev_context *devc;
 695         uint8_t *pkt;
 696         int ret;
 697
 698         devc = sdi->priv;
 699
 700         ret = dev_buffer_fill_serial(devc->buf, sdi);
 701         if (ret < 0)
 702                 return ret;
 703
 704         while ((pkt = dev_buffer_packet_find(devc->buf, packet_valid,
 705                                              PACKET_SIZE)))
 706                 handle_packet(sdi, pkt);
 707
 708         return SR_OK;
 709 }
 710
 711 static int receive_data(int fd, int revents, void *cb_data)
 712 {
 713         struct sr_dev_inst *sdi;
 714         struct dev_context *devc;
 715
 716         (void)fd;
 717
 718         if (!(sdi = cb_data))
 719                 return TRUE;
 720
 721         if (!(devc = sdi->priv))
 722                 return TRUE;
 723
 724         if (revents == G_IO_IN) {
 725                 /* Serial data arrived. */
 726                 handle_new_data(sdi);
 727         }
 728
 729         if (dev_limit_counter_limit_reached(&devc->frame_count) ||
 730             dev_time_limit_reached(&devc->time_count))
 731                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 732
 733         return TRUE;
 734 }
 735
 736 static const char *const channel_names[] = { "P1", "P2" };
 737
 738 static int setup_channels(struct sr_dev_inst *sdi)
 739 {
 740         unsigned int i;
 741         int ret;
 742
 743         ret = SR_ERR_BUG;
 744
 745         for (i = 0; i < ARRAY_SIZE(channel_names); i++)
 746                 sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE, channel_names[i]);
 747
 748         return ret;
 749 }
 750
 751 SR_PRIV void es51919_serial_clean(void *priv)
 752 {
 753         struct dev_context *devc;
 754
 755         if (!(devc = priv))
 756                 return;
 757
 758         dev_buffer_destroy(devc->buf);
 759         g_free(devc);
 760 }
 761
 762 SR_PRIV struct sr_dev_inst *es51919_serial_scan(GSList *options,
 763                                                 const char *vendor,
 764                                                 const char *model)
 765 {
 766         struct sr_serial_dev_inst *serial;
 767         struct sr_dev_inst *sdi;
 768         struct dev_context *devc;
 769         int ret;
 770
 771         serial = NULL;
 772         sdi = NULL;
 773         devc = NULL;
 774
 775         if (!(serial = serial_dev_new(options, "9600/8n1/rts=1/dtr=1")))
 776                 goto scan_cleanup;
 777
 778         ret = serial_stream_check(serial, PACKET_SIZE, packet_valid,
 779                                   3000, 9600);
 780         if (ret != SR_OK)
 781                 goto scan_cleanup;
 782
 783         sr_info("Found device on port %s.", serial->port);
 784
 785         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 786         sdi->status = SR_ST_INACTIVE;
 787         sdi->vendor = g_strdup(vendor);
 788         sdi->model = g_strdup(model);
 789         devc = g_malloc0(sizeof(struct dev_context));
 790         devc->buf = dev_buffer_new(PACKET_SIZE * 8);
 791         sdi->inst_type = SR_INST_SERIAL;
 792         sdi->conn = serial;
 793         sdi->priv = devc;
 794
 795         if (setup_channels(sdi) != SR_OK)
 796                 goto scan_cleanup;
 797
 798         return sdi;
 799
 800 scan_cleanup:
 801         es51919_serial_clean(devc);
 802         if (sdi)
 803                 sr_dev_inst_free(sdi);
 804         if (serial)
 805                 sr_serial_dev_inst_free(serial);
 806
 807         return NULL;
 808 }
 809
 810 SR_PRIV int es51919_serial_config_get(uint32_t key, GVariant **data,
 811                                       const struct sr_dev_inst *sdi,
 812                                       const struct sr_channel_group *cg)
 813 {
 814         struct dev_context *devc;
 815
 816         (void)cg;
 817
 818         if (!(devc = sdi->priv))
 819                 return SR_ERR_BUG;
 820
 821         switch (key) {
 822         case SR_CONF_OUTPUT_FREQUENCY:
 823                 *data = g_variant_new_double(frequencies[devc->freq]);
 824                 break;
 825         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 826                 *data = g_variant_new_string(models[devc->model]);
 827                 break;
 828         default:
 829                 sr_spew("%s: Unsupported key %u", __func__, key);
 830                 return SR_ERR_NA;
 831         }
 832
 833         return SR_OK;
 834 }
 835
 836 SR_PRIV int es51919_serial_config_set(uint32_t key, GVariant *data,
 837                                       const struct sr_dev_inst *sdi,
 838                                       const struct sr_channel_group *cg)
 839 {
 840         struct dev_context *devc;
 841         uint64_t val;
 842
 843         (void)cg;
 844
 845         if (!(devc = sdi->priv))
 846                 return SR_ERR_BUG;
 847
 848         switch (key) {
 849         case SR_CONF_LIMIT_MSEC:
 850                 val = g_variant_get_uint64(data);
 851                 dev_time_limit_set(&devc->time_count, val);
 852                 sr_dbg("Setting time limit to %" PRIu64 ".", val);
 853                 break;
 854         case SR_CONF_LIMIT_FRAMES:
 855                 val = g_variant_get_uint64(data);
 856                 dev_limit_counter_limit_set(&devc->frame_count, val);
 857                 sr_dbg("Setting frame limit to %" PRIu64 ".", val);
 858                 break;
 859         default:
 860                 sr_spew("%s: Unsupported key %u", __func__, key);
 861                 return SR_ERR_NA;
 862         }
 863
 864         return SR_OK;
 865 }
 866
 867 static const uint32_t scanopts[] = {
 868         SR_CONF_CONN,
 869         SR_CONF_SERIALCOMM,
 870 };
 871
 872 static const uint32_t devopts[] = {
 873         SR_CONF_LCRMETER,
 874         SR_CONF_CONTINUOUS,
 875         SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
 876         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
 877         SR_CONF_OUTPUT_FREQUENCY | SR_CONF_GET | SR_CONF_LIST,
 878         SR_CONF_EQUIV_CIRCUIT_MODEL | SR_CONF_GET | SR_CONF_LIST,
 879 };
 880
 881 static const struct std_opt_desc opts = {
 882         scanopts, ARRAY_SIZE(scanopts),
 883         devopts, ARRAY_SIZE(devopts),
 884 };
 885
 886 SR_PRIV int es51919_serial_config_list(uint32_t key, GVariant **data,
 887                                        const struct sr_dev_inst *sdi,
 888                                        const struct sr_channel_group *cg)
 889 {
 890         (void)sdi;
 891         (void)cg;
 892
 893         if (std_config_list(key, data, &opts) == SR_OK)
 894                 return SR_OK;
 895
 896         switch (key) {
 897         case SR_CONF_OUTPUT_FREQUENCY:
 898                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_DOUBLE,
 899                         frequencies, ARRAY_SIZE(frequencies), sizeof(double));
 900                 break;
 901         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 902                 *data = g_variant_new_strv(models, ARRAY_SIZE(models));
 903                 break;
 904         default:
 905                 sr_spew("%s: Unsupported key %u", __func__, key);
 906                 return SR_ERR_NA;
 907         }
 908
 909         return SR_OK;
 910 }
 911
 912 SR_PRIV int es51919_serial_acquisition_start(const struct sr_dev_inst *sdi,
 913                                              void *cb_data)
 914 {
 915         struct dev_context *devc;
 916         struct sr_serial_dev_inst *serial;
 917
 918         if (sdi->status != SR_ST_ACTIVE)
 919                 return SR_ERR_DEV_CLOSED;
 920
 921         if (!(devc = sdi->priv))
 922                 return SR_ERR_BUG;
 923
 924         devc->cb_data = cb_data;
 925
 926         dev_limit_counter_start(&devc->frame_count);
 927         dev_time_counter_start(&devc->time_count);
 928
 929         /* Send header packet to the session bus. */
 930         std_session_send_df_header(cb_data, LOG_PREFIX);
 931
 932         /* Poll every 50ms, or whenever some data comes in. */
 933         serial = sdi->conn;
 934         serial_source_add(sdi->session, serial, G_IO_IN, 50,
 935                           receive_data, (void *)sdi);
 936
 937         return SR_OK;
 938 }
 939
 940 SR_PRIV int es51919_serial_acquisition_stop(struct sr_dev_inst *sdi,
 941                                             void *cb_data)
 942 {
 943         return std_serial_dev_acquisition_stop(sdi, cb_data,
 944                         std_serial_dev_close, sdi->conn, LOG_PREFIX);
 945 }