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