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.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         if (!(dbuf = g_try_malloc(sizeof(struct dev_buffer) + size))) {
  45                 sr_err("Dev buffer malloc failed (size=%zu).", size);
  46                 return NULL;
  47         }
  48
  49         dbuf->size = size;
  50         dbuf->len = 0;
  51         dbuf->offset = 0;
  52
  53         return dbuf;
  54 }
  55
  56 static void dev_buffer_destroy(struct dev_buffer *dbuf)
  57 {
  58         g_free(dbuf);
  59 }
  60
  61 static int dev_buffer_fill_serial(struct dev_buffer *dbuf,
  62                                   struct sr_dev_inst *sdi)
  63 {
  64         struct sr_serial_dev_inst *serial;
  65         int len;
  66
  67         serial = sdi->conn;
  68
  69         /* If we already have data, move it to the beginning of the buffer. */
  70         if (dbuf->len > 0 && dbuf->offset > 0)
  71                 memmove(dbuf->data, dbuf->data + dbuf->offset, dbuf->len);
  72
  73         dbuf->offset = 0;
  74
  75         len = dbuf->size - dbuf->len;
  76         len = serial_read_nonblocking(serial, dbuf->data + dbuf->len, len);
  77         if (len < 0) {
  78                 sr_err("Serial port read error: %d.", len);
  79                 return len;
  80         }
  81
  82         dbuf->len += len;
  83
  84         return SR_OK;
  85 }
  86
  87 static uint8_t *dev_buffer_packet_find(struct dev_buffer *dbuf,
  88                                 gboolean (*packet_valid)(const uint8_t *),
  89                                 size_t packet_size)
  90 {
  91         size_t offset;
  92
  93         while (dbuf->len >= packet_size) {
  94                 if (packet_valid(dbuf->data + dbuf->offset)) {
  95                         offset = dbuf->offset;
  96                         dbuf->offset += packet_size;
  97                         dbuf->len -= packet_size;
  98                         return dbuf->data + offset;
  99                 }
 100                 dbuf->offset++;
 101                 dbuf->len--;
 102         }
 103
 104         return NULL;
 105 }
 106
 107 struct dev_sample_counter {
 108         /** The current number of already received samples. */
 109         uint64_t count;
 110         /** The current sampling limit (in number of samples). */
 111         uint64_t limit;
 112 };
 113
 114 static void dev_sample_counter_start(struct dev_sample_counter *cnt)
 115 {
 116         cnt->count = 0;
 117 }
 118
 119 static void dev_sample_counter_inc(struct dev_sample_counter *cnt)
 120 {
 121         cnt->count++;
 122 }
 123
 124 static void dev_sample_limit_set(struct dev_sample_counter *cnt, uint64_t limit)
 125 {
 126         cnt->limit = limit;
 127 }
 128
 129 static gboolean dev_sample_limit_reached(struct dev_sample_counter *cnt)
 130 {
 131         if (cnt->limit && cnt->count >= cnt->limit) {
 132                 sr_info("Requested sample limit reached.");
 133                 return TRUE;
 134         }
 135
 136         return FALSE;
 137 }
 138
 139 struct dev_time_counter {
 140         /** The starting time of current sampling run. */
 141         int64_t starttime;
 142         /** The time limit (in milliseconds). */
 143         uint64_t limit;
 144 };
 145
 146 static void dev_time_counter_start(struct dev_time_counter *cnt)
 147 {
 148         cnt->starttime = g_get_monotonic_time();
 149 }
 150
 151 static void dev_time_limit_set(struct dev_time_counter *cnt, uint64_t limit)
 152 {
 153         cnt->limit = limit;
 154 }
 155
 156 static gboolean dev_time_limit_reached(struct dev_time_counter *cnt)
 157 {
 158         int64_t time;
 159
 160         if (cnt->limit) {
 161                 time = (g_get_monotonic_time() - cnt->starttime) / 1000;
 162                 if (time > (int64_t)cnt->limit) {
 163                         sr_info("Requested time limit reached.");
 164                         return TRUE;
 165                 }
 166         }
 167
 168         return FALSE;
 169 }
 170
 171 static void serial_conf_get(GSList *options, const char *def_serialcomm,
 172                             const char **conn, const char **serialcomm)
 173 {
 174         struct sr_config *src;
 175         GSList *l;
 176
 177         *conn = *serialcomm = NULL;
 178         for (l = options; l; l = l->next) {
 179                 src = l->data;
 180                 switch (src->key) {
 181                 case SR_CONF_CONN:
 182                         *conn = g_variant_get_string(src->data, NULL);
 183                         break;
 184                 case SR_CONF_SERIALCOMM:
 185                         *serialcomm = g_variant_get_string(src->data, NULL);
 186                         break;
 187                 }
 188         }
 189
 190         if (*serialcomm == NULL)
 191                 *serialcomm = def_serialcomm;
 192 }
 193
 194 static struct sr_serial_dev_inst *serial_dev_new(GSList *options,
 195                                                  const char *def_serialcomm)
 196
 197 {
 198         const char *conn, *serialcomm;
 199
 200         serial_conf_get(options, def_serialcomm, &conn, &serialcomm);
 201
 202         if (!conn)
 203                 return NULL;
 204
 205         return sr_serial_dev_inst_new(conn, serialcomm);
 206 }
 207
 208 static int serial_stream_check_buf(struct sr_serial_dev_inst *serial,
 209                                    uint8_t *buf, size_t buflen,
 210                                    size_t packet_size,
 211                                    packet_valid_callback is_valid,
 212                                    uint64_t timeout_ms, int baudrate)
 213 {
 214         size_t len, dropped;
 215         int ret;
 216
 217         if ((ret = serial_open(serial, SERIAL_RDWR)) != SR_OK)
 218                 return ret;
 219
 220         serial_flush(serial);
 221
 222         len = buflen;
 223         ret = serial_stream_detect(serial, buf, &len, packet_size,
 224                                    is_valid, timeout_ms, baudrate);
 225
 226         serial_close(serial);
 227
 228         if (ret != SR_OK)
 229                 return ret;
 230
 231         /*
 232          * If we dropped more than two packets worth of data, something is
 233          * wrong. We shouldn't quit however, since the dropped bytes might be
 234          * just zeroes at the beginning of the stream. Those can occur as a
 235          * combination of the nonstandard cable that ships with some devices
 236          * and the serial port or USB to serial adapter.
 237          */
 238         dropped = len - packet_size;
 239         if (dropped > 2 * packet_size)
 240                 sr_warn("Had to drop too much data.");
 241
 242         return SR_OK;
 243 }
 244
 245 static int serial_stream_check(struct sr_serial_dev_inst *serial,
 246                                size_t packet_size,
 247                                packet_valid_callback is_valid,
 248                                uint64_t timeout_ms, int baudrate)
 249 {
 250         uint8_t buf[128];
 251
 252         return serial_stream_check_buf(serial, buf, sizeof(buf), packet_size,
 253                                        is_valid, timeout_ms, baudrate);
 254 }
 255
 256 struct std_opt_desc {
 257         const uint32_t *scanopts;
 258         const int num_scanopts;
 259         const uint32_t *devopts;
 260         const int num_devopts;
 261 };
 262
 263 static int std_config_list(uint32_t key, GVariant **data,
 264                            const struct std_opt_desc *d)
 265 {
 266         switch (key) {
 267         case SR_CONF_SCAN_OPTIONS:
 268                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 269                         d->scanopts, d->num_scanopts, sizeof(uint32_t));
 270                 break;
 271         case SR_CONF_DEVICE_OPTIONS:
 272                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 273                         d->devopts, d->num_devopts, sizeof(uint32_t));
 274                 break;
 275         default:
 276                 return SR_ERR_NA;
 277         }
 278
 279         return SR_OK;
 280 }
 281
 282 static int send_config_update(struct sr_dev_inst *sdi, struct sr_config *cfg)
 283 {
 284         struct sr_datafeed_packet packet;
 285         struct sr_datafeed_meta meta;
 286
 287         memset(&meta, 0, sizeof(meta));
 288
 289         packet.type = SR_DF_META;
 290         packet.payload = &meta;
 291
 292         meta.config = g_slist_append(meta.config, cfg);
 293
 294         return sr_session_send(sdi, &packet);
 295 }
 296
 297 static int send_config_update_key(struct sr_dev_inst *sdi, uint32_t key,
 298                                   GVariant *var)
 299 {
 300         struct sr_config *cfg;
 301         int ret;
 302
 303         cfg = sr_config_new(key, var);
 304         if (!cfg)
 305                 return SR_ERR;
 306
 307         ret = send_config_update(sdi, cfg);
 308         sr_config_free(cfg);
 309
 310         return ret;
 311
 312 }
 313
 314 /*
 315  * Cyrustek ES51919 LCR chipset host protocol.
 316  *
 317  * Public official documentation does not contain the protocol
 318  * description, so this is all based on reverse engineering.
 319  *
 320  * Packet structure (17 bytes):
 321  *
 322  * 0x00: header1 ?? (0x00)
 323  * 0x01: header2 ?? (0x0d)
 324  *
 325  * 0x02: flags
 326  *         bit 0 = hold enabled
 327  *         bit 1 = reference shown (in delta mode)
 328  *         bit 2 = delta mode
 329  *         bit 3 = calibration mode
 330  *         bit 4 = sorting mode
 331  *         bit 5 = LCR mode
 332  *         bit 6 = auto mode
 333  *         bit 7 = parallel measurement (vs. serial)
 334  *
 335  * 0x03: config
 336  *         bit 0-4 = ??? (0x10)
 337  *         bit 5-7 = test frequency
 338  *                     0 = 100 Hz
 339  *                     1 = 120 Hz
 340  *                     2 = 1 kHz
 341  *                     3 = 10 kHz
 342  *                     4 = 100 kHz
 343  *                     5 = 0 Hz (DC)
 344  *
 345  * 0x04: tolerance (sorting mode)
 346  *         0 = not set
 347  *         3 = +-0.25%
 348  *         4 = +-0.5%
 349  *         5 = +-1%
 350  *         6 = +-2%
 351  *         7 = +-5%
 352  *         8 = +-10%
 353  *         9 = +-20%
 354  *        10 = -20+80%
 355  *
 356  * 0x05-0x09: primary measurement
 357  *   0x05: measured quantity
 358  *           1 = inductance
 359  *           2 = capacitance
 360  *           3 = resistance
 361  *           4 = DC resistance
 362  *   0x06: measurement MSB  (0x4e20 = 20000 = outside limits)
 363  *   0x07: measurement LSB
 364  *   0x08: measurement info
 365  *           bit 0-2 = decimal point multiplier (10^-val)
 366  *           bit 3-7 = unit
 367  *                       0 = no unit
 368  *                       1 = Ohm
 369  *                       2 = kOhm
 370  *                       3 = MOhm
 371  *                       5 = uH
 372  *                       6 = mH
 373  *                       7 = H
 374  *                       8 = kH
 375  *                       9 = pF
 376  *                       10 = nF
 377  *                       11 = uF
 378  *                       12 = mF
 379  *                       13 = %
 380  *                       14 = degree
 381  *   0x09: measurement status
 382  *           bit 0-3 = status
 383  *                       0 = normal (measurement shown)
 384  *                       1 = blank (nothing shown)
 385  *                       2 = lines ("----")
 386  *                       3 = outside limits ("OL")
 387  *                       7 = pass ("PASS")
 388  *                       8 = fail ("FAIL")
 389  *                       9 = open ("OPEn")
 390  *                      10 = shorted ("Srt")
 391  *           bit 4-6 = ??? (maybe part of same field with 0-3)
 392  *           bit 7   = ??? (some independent flag)
 393  *
 394  * 0x0a-0x0e: secondary measurement
 395  *   0x0a: measured quantity
 396  *           0 = none
 397  *           1 = dissipation factor
 398  *           2 = quality factor
 399  *           3 = parallel AC resistance / ESR
 400  *           4 = phase angle
 401  *   0x0b-0x0e: like primary measurement
 402  *
 403  * 0x0f: footer1 (0x0d) ?
 404  * 0x10: footer2 (0x0a) ?
 405  */
 406
 407 #define PACKET_SIZE 17
 408
 409 static const uint64_t frequencies[] = {
 410         100, 120, 1000, 10000, 100000, 0,
 411 };
 412
 413 enum { QUANT_AUTO = 5, };
 414
 415 static const char *const quantities1[] = {
 416         "NONE", "INDUCTANCE", "CAPACITANCE", "RESISTANCE", "RESISTANCE", "AUTO",
 417 };
 418
 419 static const char *const list_quantities1[] = {
 420         "NONE", "INDUCTANCE", "CAPACITANCE", "RESISTANCE", "AUTO",
 421 };
 422
 423 static const char *const quantities2[] = {
 424         "NONE", "DISSIPATION", "QUALITY", "RESISTANCE", "ANGLE", "AUTO",
 425 };
 426
 427 enum { MODEL_NONE, MODEL_PAR, MODEL_SER, MODEL_AUTO, };
 428
 429 static const char *const models[] = {
 430         "NONE", "PARALLEL", "SERIES", "AUTO",
 431 };
 432
 433 /** Private, per-device-instance driver context. */
 434 struct dev_context {
 435         /** Opaque pointer passed in by the frontend. */
 436         void *cb_data;
 437
 438         /** The number of samples. */
 439         struct dev_sample_counter sample_count;
 440
 441         /** The time limit counter. */
 442         struct dev_time_counter time_count;
 443
 444         /** Data buffer. */
 445         struct dev_buffer *buf;
 446
 447         /** The frequency of the test signal (index to frequencies[]). */
 448         unsigned int freq;
 449
 450         /** Measured primary quantity (index to quantities1[]). */
 451         unsigned int quant1;
 452
 453         /** Measured secondary quantity (index to quantities2[]). */
 454         unsigned int quant2;
 455
 456         /** Equivalent circuit model (index to models[]). */
 457         unsigned int model;
 458 };
 459
 460 static const uint8_t *pkt_to_buf(const uint8_t *pkt, int is_secondary)
 461 {
 462         return is_secondary ? pkt + 10 : pkt + 5;
 463 }
 464
 465 static int parse_mq(const uint8_t *pkt, int is_secondary, int is_parallel)
 466 {
 467         const uint8_t *buf;
 468
 469         buf = pkt_to_buf(pkt, is_secondary);
 470
 471         switch (is_secondary << 8 | buf[0]) {
 472         case 0x001:
 473                 return is_parallel ?
 474                         SR_MQ_PARALLEL_INDUCTANCE : SR_MQ_SERIES_INDUCTANCE;
 475         case 0x002:
 476                 return is_parallel ?
 477                         SR_MQ_PARALLEL_CAPACITANCE : SR_MQ_SERIES_CAPACITANCE;
 478         case 0x003:
 479         case 0x103:
 480                 return is_parallel ?
 481                         SR_MQ_PARALLEL_RESISTANCE : SR_MQ_SERIES_RESISTANCE;
 482         case 0x004:
 483                 return SR_MQ_RESISTANCE;
 484         case 0x100:
 485                 return SR_MQ_DIFFERENCE;
 486         case 0x101:
 487                 return SR_MQ_DISSIPATION_FACTOR;
 488         case 0x102:
 489                 return SR_MQ_QUALITY_FACTOR;
 490         case 0x104:
 491                 return SR_MQ_PHASE_ANGLE;
 492         }
 493
 494         sr_err("Unknown quantity 0x%03x.", is_secondary << 8 | buf[0]);
 495
 496         return -1;
 497 }
 498
 499 static float parse_value(const uint8_t *buf)
 500 {
 501         static const float decimals[] = {
 502                 1, 1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6, 1e-7
 503         };
 504         int16_t val;
 505
 506         val = (buf[1] << 8) | buf[2];
 507         return (float)val * decimals[buf[3] & 7];
 508 }
 509
 510 static void parse_measurement(const uint8_t *pkt, float *floatval,
 511                               struct sr_datafeed_analog *analog,
 512                               int is_secondary)
 513 {
 514         static const struct {
 515                 int unit;
 516                 float mult;
 517         } units[] = {
 518                 { SR_UNIT_UNITLESS, 1 },        /* no unit */
 519                 { SR_UNIT_OHM, 1 },             /* Ohm     */
 520                 { SR_UNIT_OHM, 1e3 },           /* kOhm    */
 521                 { SR_UNIT_OHM, 1e6 },           /* MOhm    */
 522                 { -1, 0 },                      /* ???     */
 523                 { SR_UNIT_HENRY, 1e-6 },        /* uH      */
 524                 { SR_UNIT_HENRY, 1e-3 },        /* mH      */
 525                 { SR_UNIT_HENRY, 1 },           /* H       */
 526                 { SR_UNIT_HENRY, 1e3 },         /* kH      */
 527                 { SR_UNIT_FARAD, 1e-12 },       /* pF      */
 528                 { SR_UNIT_FARAD, 1e-9 },        /* nF      */
 529                 { SR_UNIT_FARAD, 1e-6 },        /* uF      */
 530                 { SR_UNIT_FARAD, 1e-3 },        /* mF      */
 531                 { SR_UNIT_PERCENTAGE, 1 },      /* %       */
 532                 { SR_UNIT_DEGREE, 1 }           /* degree  */
 533         };
 534         const uint8_t *buf;
 535         int state;
 536
 537         buf = pkt_to_buf(pkt, is_secondary);
 538
 539         analog->mq = -1;
 540         analog->mqflags = 0;
 541
 542         state = buf[4] & 0xf;
 543
 544         if (state != 0 && state != 3)
 545                 return;
 546
 547         if (pkt[2] & 0x18) {
 548                 /* Calibration and Sorting modes not supported. */
 549                 return;
 550         }
 551
 552         if (!is_secondary) {
 553                 if (pkt[2] & 0x01)
 554                         analog->mqflags |= SR_MQFLAG_HOLD;
 555                 if (pkt[2] & 0x02)
 556                         analog->mqflags |= SR_MQFLAG_REFERENCE;
 557         } else {
 558                 if (pkt[2] & 0x04)
 559                         analog->mqflags |= SR_MQFLAG_RELATIVE;
 560         }
 561
 562         if ((analog->mq = parse_mq(pkt, is_secondary, pkt[2] & 0x80)) < 0)
 563                 return;
 564
 565         if ((buf[3] >> 3) >= ARRAY_SIZE(units)) {
 566                 sr_err("Unknown unit %u.", buf[3] >> 3);
 567                 analog->mq = -1;
 568                 return;
 569         }
 570
 571         analog->unit = units[buf[3] >> 3].unit;
 572
 573         *floatval = parse_value(buf);
 574         *floatval *= (state == 0) ? units[buf[3] >> 3].mult : INFINITY;
 575 }
 576
 577 static unsigned int parse_freq(const uint8_t *pkt)
 578 {
 579         unsigned int freq;
 580
 581         freq = pkt[3] >> 5;
 582
 583         if (freq >= ARRAY_SIZE(frequencies)) {
 584                 sr_err("Unknown frequency %u.", freq);
 585                 freq = ARRAY_SIZE(frequencies) - 1;
 586         }
 587
 588         return freq;
 589 }
 590
 591 static unsigned int parse_quant(const uint8_t *pkt, int is_secondary)
 592 {
 593         const uint8_t *buf;
 594
 595         if (pkt[2] & 0x20)
 596                 return QUANT_AUTO;
 597
 598         buf = pkt_to_buf(pkt, is_secondary);
 599
 600         return buf[0];
 601 }
 602
 603 static unsigned int parse_model(const uint8_t *pkt)
 604 {
 605         if (pkt[2] & 0x40)
 606                 return MODEL_AUTO;
 607         else if (parse_mq(pkt, 0, 0) == SR_MQ_RESISTANCE)
 608                 return MODEL_NONE;
 609         else if (pkt[2] & 0x80)
 610                 return MODEL_PAR;
 611         else
 612                 return MODEL_SER;
 613
 614 }
 615
 616 static gboolean packet_valid(const uint8_t *pkt)
 617 {
 618         /*
 619          * If the first two bytes of the packet are indeed a constant
 620          * header, they should be checked too. Since we don't know it
 621          * for sure, we'll just check the last two for now since they
 622          * seem to be constant just like in the other Cyrustek chipset
 623          * protocols.
 624          */
 625         if (pkt[15] == 0xd && pkt[16] == 0xa)
 626                 return TRUE;
 627
 628         return FALSE;
 629 }
 630
 631 static int do_config_update(struct sr_dev_inst *sdi, uint32_t key,
 632                             GVariant *var)
 633 {
 634         struct dev_context *devc;
 635
 636         devc = sdi->priv;
 637
 638         return send_config_update_key(devc->cb_data, key, var);
 639 }
 640
 641 static int send_freq_update(struct sr_dev_inst *sdi, unsigned int freq)
 642 {
 643         return do_config_update(sdi, SR_CONF_OUTPUT_FREQUENCY,
 644                                 g_variant_new_uint64(frequencies[freq]));
 645 }
 646
 647 static int send_quant1_update(struct sr_dev_inst *sdi, unsigned int quant)
 648 {
 649         return do_config_update(sdi, SR_CONF_MEASURED_QUANTITY,
 650                                 g_variant_new_string(quantities1[quant]));
 651 }
 652
 653 static int send_quant2_update(struct sr_dev_inst *sdi, unsigned int quant)
 654 {
 655         return do_config_update(sdi, SR_CONF_MEASURED_2ND_QUANTITY,
 656                                 g_variant_new_string(quantities2[quant]));
 657 }
 658
 659 static int send_model_update(struct sr_dev_inst *sdi, unsigned int model)
 660 {
 661         return do_config_update(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL,
 662                                 g_variant_new_string(models[model]));
 663 }
 664
 665 static void handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt)
 666 {
 667         struct sr_datafeed_packet packet;
 668         struct sr_datafeed_analog analog;
 669         struct dev_context *devc;
 670         unsigned int val;
 671         float floatval;
 672         int count;
 673
 674         devc = sdi->priv;
 675
 676         val = parse_freq(pkt);
 677         if (val != devc->freq) {
 678                 if (send_freq_update(sdi, val) == SR_OK)
 679                         devc->freq = val;
 680                 else
 681                         return;
 682         }
 683
 684         val = parse_quant(pkt, 0);
 685         if (val != devc->quant1) {
 686                 if (send_quant1_update(sdi, val) == SR_OK)
 687                         devc->quant1 = val;
 688                 else
 689                         return;
 690         }
 691
 692         val = parse_quant(pkt, 1);
 693         if (val != devc->quant2) {
 694                 if (send_quant2_update(sdi, val) == SR_OK)
 695                         devc->quant2 = val;
 696                 else
 697                         return;
 698         }
 699
 700         val = parse_model(pkt);
 701         if (val != devc->model) {
 702                 if (send_model_update(sdi, val) == SR_OK)
 703                         devc->model = val;
 704                 else
 705                         return;
 706         }
 707
 708         count = 0;
 709
 710         memset(&analog, 0, sizeof(analog));
 711
 712         analog.num_samples = 1;
 713         analog.data = &floatval;
 714
 715         packet.type = SR_DF_ANALOG;
 716         packet.payload = &analog;
 717
 718         analog.channels = g_slist_append(NULL, sdi->channels->data);
 719
 720         parse_measurement(pkt, &floatval, &analog, 0);
 721         if (analog.mq >= 0) {
 722                 if (sr_session_send(devc->cb_data, &packet) == SR_OK)
 723                         count++;
 724         }
 725
 726         analog.channels = g_slist_append(NULL, sdi->channels->next->data);
 727
 728         parse_measurement(pkt, &floatval, &analog, 1);
 729         if (analog.mq >= 0) {
 730                 if (sr_session_send(devc->cb_data, &packet) == SR_OK)
 731                         count++;
 732         }
 733
 734         if (count > 0)
 735                 dev_sample_counter_inc(&devc->sample_count);
 736 }
 737
 738 static int handle_new_data(struct sr_dev_inst *sdi)
 739 {
 740         struct dev_context *devc;
 741         uint8_t *pkt;
 742         int ret;
 743
 744         devc = sdi->priv;
 745
 746         ret = dev_buffer_fill_serial(devc->buf, sdi);
 747         if (ret < 0)
 748                 return ret;
 749
 750         while ((pkt = dev_buffer_packet_find(devc->buf, packet_valid,
 751                                              PACKET_SIZE)))
 752                 handle_packet(sdi, pkt);
 753
 754         return SR_OK;
 755 }
 756
 757 static int receive_data(int fd, int revents, void *cb_data)
 758 {
 759         struct sr_dev_inst *sdi;
 760         struct dev_context *devc;
 761
 762         (void)fd;
 763
 764         if (!(sdi = cb_data))
 765                 return TRUE;
 766
 767         if (!(devc = sdi->priv))
 768                 return TRUE;
 769
 770         if (revents == G_IO_IN) {
 771                 /* Serial data arrived. */
 772                 handle_new_data(sdi);
 773         }
 774
 775         if (dev_sample_limit_reached(&devc->sample_count) ||
 776             dev_time_limit_reached(&devc->time_count))
 777                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 778
 779         return TRUE;
 780 }
 781
 782 static int add_channel(struct sr_dev_inst *sdi, const char *name)
 783 {
 784         struct sr_channel *ch;
 785
 786         if (!(ch = sr_channel_new(0, SR_CHANNEL_ANALOG, TRUE, name)))
 787                 return SR_ERR;
 788
 789         sdi->channels = g_slist_append(sdi->channels, ch);
 790
 791         return SR_OK;
 792 }
 793
 794 static const char *const channel_names[] = { "P1", "P2" };
 795
 796 static int setup_channels(struct sr_dev_inst *sdi)
 797 {
 798         unsigned int i;
 799         int ret;
 800
 801         ret = SR_ERR_BUG;
 802
 803         for (i = 0; i < ARRAY_SIZE(channel_names); i++) {
 804                 ret = add_channel(sdi, channel_names[i]);
 805                 if (ret != SR_OK)
 806                         break;
 807         }
 808
 809         return ret;
 810 }
 811
 812 SR_PRIV void es51919_serial_clean(void *priv)
 813 {
 814         struct dev_context *devc;
 815
 816         if (!(devc = priv))
 817                 return;
 818
 819         dev_buffer_destroy(devc->buf);
 820         g_free(devc);
 821 }
 822
 823 SR_PRIV struct sr_dev_inst *es51919_serial_scan(GSList *options,
 824                                                 const char *vendor,
 825                                                 const char *model)
 826 {
 827         struct sr_serial_dev_inst *serial;
 828         struct sr_dev_inst *sdi;
 829         struct dev_context *devc;
 830         int ret;
 831
 832         serial = NULL;
 833         sdi = NULL;
 834         devc = NULL;
 835
 836         if (!(serial = serial_dev_new(options, "9600/8n1/rts=1/dtr=1")))
 837                 goto scan_cleanup;
 838
 839         ret = serial_stream_check(serial, PACKET_SIZE, packet_valid,
 840                                   3000, 9600);
 841         if (ret != SR_OK)
 842                 goto scan_cleanup;
 843
 844         sr_info("Found device on port %s.", serial->port);
 845
 846         sdi = sr_dev_inst_new();
 847         sdi->status = SR_ST_INACTIVE;
 848         sdi->vendor = g_strdup(vendor);
 849         sdi->model = g_strdup(model);
 850
 851         if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 852                 sr_err("Device context malloc failed.");
 853                 goto scan_cleanup;
 854         }
 855
 856         if (!(devc->buf = dev_buffer_new(PACKET_SIZE * 8)))
 857                 goto scan_cleanup;
 858
 859         sdi->inst_type = SR_INST_SERIAL;
 860         sdi->conn = serial;
 861
 862         sdi->priv = devc;
 863
 864         if (setup_channels(sdi) != SR_OK)
 865                 goto scan_cleanup;
 866
 867         return sdi;
 868
 869 scan_cleanup:
 870         es51919_serial_clean(devc);
 871         if (sdi)
 872                 sr_dev_inst_free(sdi);
 873         if (serial)
 874                 sr_serial_dev_inst_free(serial);
 875
 876         return NULL;
 877 }
 878
 879 SR_PRIV int es51919_serial_config_get(uint32_t key, GVariant **data,
 880                                       const struct sr_dev_inst *sdi,
 881                                       const struct sr_channel_group *cg)
 882 {
 883         struct dev_context *devc;
 884
 885         (void)cg;
 886
 887         if (!(devc = sdi->priv))
 888                 return SR_ERR_BUG;
 889
 890         switch (key) {
 891         case SR_CONF_OUTPUT_FREQUENCY:
 892                 *data = g_variant_new_uint64(frequencies[devc->freq]);
 893                 break;
 894         case SR_CONF_MEASURED_QUANTITY:
 895                 *data = g_variant_new_string(quantities1[devc->quant1]);
 896                 break;
 897         case SR_CONF_MEASURED_2ND_QUANTITY:
 898                 *data = g_variant_new_string(quantities2[devc->quant2]);
 899                 break;
 900         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 901                 *data = g_variant_new_string(models[devc->model]);
 902                 break;
 903         default:
 904                 sr_spew("%s: Unsupported key %u", __func__, key);
 905                 return SR_ERR_NA;
 906         }
 907
 908         return SR_OK;
 909 }
 910
 911 SR_PRIV int es51919_serial_config_set(uint32_t key, GVariant *data,
 912                                       const struct sr_dev_inst *sdi,
 913                                       const struct sr_channel_group *cg)
 914 {
 915         struct dev_context *devc;
 916         uint64_t val;
 917
 918         (void)cg;
 919
 920         if (!(devc = sdi->priv))
 921                 return SR_ERR_BUG;
 922
 923         switch (key) {
 924         case SR_CONF_LIMIT_MSEC:
 925                 val = g_variant_get_uint64(data);
 926                 dev_time_limit_set(&devc->time_count, val);
 927                 sr_dbg("Setting time limit to %" PRIu64 ".", val);
 928                 break;
 929         case SR_CONF_LIMIT_SAMPLES:
 930                 val = g_variant_get_uint64(data);
 931                 dev_sample_limit_set(&devc->sample_count, val);
 932                 sr_dbg("Setting sample limit to %" PRIu64 ".", val);
 933                 break;
 934         default:
 935                 sr_spew("%s: Unsupported key %u", __func__, key);
 936                 return SR_ERR_NA;
 937         }
 938
 939         return SR_OK;
 940 }
 941
 942 static const uint32_t scanopts[] = {
 943         SR_CONF_CONN,
 944         SR_CONF_SERIALCOMM,
 945 };
 946
 947 static const uint32_t devopts[] = {
 948         SR_CONF_LCRMETER,
 949         SR_CONF_CONTINUOUS,
 950         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
 951         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
 952         SR_CONF_OUTPUT_FREQUENCY | SR_CONF_GET | SR_CONF_LIST,
 953         SR_CONF_MEASURED_QUANTITY | SR_CONF_GET | SR_CONF_LIST,
 954         SR_CONF_MEASURED_2ND_QUANTITY | SR_CONF_GET | SR_CONF_LIST,
 955         SR_CONF_EQUIV_CIRCUIT_MODEL | SR_CONF_GET | SR_CONF_LIST,
 956 };
 957
 958 static const struct std_opt_desc opts = {
 959         scanopts, ARRAY_SIZE(scanopts),
 960         devopts, ARRAY_SIZE(devopts),
 961 };
 962
 963 SR_PRIV int es51919_serial_config_list(uint32_t key, GVariant **data,
 964                                        const struct sr_dev_inst *sdi,
 965                                        const struct sr_channel_group *cg)
 966 {
 967         (void)sdi;
 968         (void)cg;
 969
 970         if (std_config_list(key, data, &opts) == SR_OK)
 971                 return SR_OK;
 972
 973         switch (key) {
 974         case SR_CONF_OUTPUT_FREQUENCY:
 975                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT64,
 976                         frequencies, ARRAY_SIZE(frequencies), sizeof(uint64_t));
 977                 break;
 978         case SR_CONF_MEASURED_QUANTITY:
 979                 *data = g_variant_new_strv(list_quantities1,
 980                                            ARRAY_SIZE(list_quantities1));
 981                 break;
 982         case SR_CONF_MEASURED_2ND_QUANTITY:
 983                 *data = g_variant_new_strv(quantities2,
 984                                            ARRAY_SIZE(quantities2));
 985                 break;
 986         case SR_CONF_EQUIV_CIRCUIT_MODEL:
 987                 *data = g_variant_new_strv(models, ARRAY_SIZE(models));
 988                 break;
 989         default:
 990                 sr_spew("%s: Unsupported key %u", __func__, key);
 991                 return SR_ERR_NA;
 992         }
 993
 994         return SR_OK;
 995 }
 996
 997 SR_PRIV int es51919_serial_acquisition_start(const struct sr_dev_inst *sdi,
 998                                              void *cb_data)
 999 {
1000         struct dev_context *devc;
1001         struct sr_serial_dev_inst *serial;
1002
1003         if (sdi->status != SR_ST_ACTIVE)
1004                 return SR_ERR_DEV_CLOSED;
1005
1006         if (!(devc = sdi->priv))
1007                 return SR_ERR_BUG;
1008
1009         devc->cb_data = cb_data;
1010
1011         dev_sample_counter_start(&devc->sample_count);
1012         dev_time_counter_start(&devc->time_count);
1013
1014         /* Send header packet to the session bus. */
1015         std_session_send_df_header(cb_data, LOG_PREFIX);
1016
1017         /* Poll every 50ms, or whenever some data comes in. */
1018         serial = sdi->conn;
1019         serial_source_add(sdi->session, serial, G_IO_IN, 50,
1020                           receive_data, (void *)sdi);
1021
1022         return SR_OK;
1023 }
1024
1025 SR_PRIV int es51919_serial_acquisition_stop(struct sr_dev_inst *sdi,
1026                                             void *cb_data)
1027 {
1028         return std_serial_dev_acquisition_stop(sdi, cb_data,
1029                         std_serial_dev_close, sdi->conn, LOG_PREFIX);
1030 }