src/hardware/motech-lps-30x/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
   5  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> (code from atten-pps3xxx)
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /** @file
  22  *  <em>Motech LPS-30x series</em> power supply driver
  23  *  @internal
  24  */
  25
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <math.h>
  29 #include <string.h>
  30 #include "protocol.h"
  31
  32 /* Forward declarations */
  33 SR_PRIV struct sr_dev_driver motech_lps_301_driver_info;
  34 SR_PRIV int lps_read_reply(struct sr_serial_dev_inst *serial, char **buf, int *buflen);
  35 SR_PRIV int lps_send_va(struct sr_serial_dev_inst *serial, const char* fmt, va_list args);
  36 SR_PRIV int lps_cmd_ok(struct sr_serial_dev_inst *serial, const char* fmt, ...);
  37 SR_PRIV int lps_cmd_reply(char* reply, struct sr_serial_dev_inst *serial, const char* fmt, ...);
  38 SR_PRIV int lps_query_status(struct sr_dev_inst* sdi);
  39
  40 /* Serial communication parameters */
  41 #define SERIALCOMM "2400/8n1/dtr=1/rts=1/flow=0"
  42
  43 #define VENDOR_MOTECH "Motech"
  44
  45 /** Driver capabilities generic. */
  46 static const uint32_t drvopts[] = {
  47         /* Device class */
  48         SR_CONF_POWER_SUPPLY,
  49 };
  50
  51 /** Driver scanning options. */
  52 static const uint32_t scanopts[] = {
  53         SR_CONF_CONN,
  54         SR_CONF_SERIALCOMM,
  55 };
  56
  57 /** Hardware capabilities generic. */
  58 static const uint32_t devopts[] = {
  59         /* Device class */
  60         SR_CONF_POWER_SUPPLY,
  61         /* Acquisition modes. */
  62         SR_CONF_CONTINUOUS,
  63         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  64         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  65         /* Device configuration */
  66         SR_CONF_CHANNEL_CONFIG | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  67 };
  68
  69 /** Hardware capabilities channel 1, 2. */
  70 static const uint32_t devopts_ch12[] = {
  71         SR_CONF_VOLTAGE | SR_CONF_GET,
  72         SR_CONF_VOLTAGE_TARGET | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  73         SR_CONF_CURRENT | SR_CONF_GET,
  74         SR_CONF_CURRENT_LIMIT | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  75         SR_CONF_ENABLED | SR_CONF_GET | SR_CONF_SET,
  76 };
  77
  78 /** Hardware capabilities channel 3. (LPS-304/305 only). */
  79 static const uint32_t devopts_ch3[] = {
  80         SR_CONF_VOLTAGE | SR_CONF_GET,
  81         SR_CONF_ENABLED | SR_CONF_GET | SR_CONF_SET,
  82 };
  83
  84 static const char *channel_modes[] = {
  85         "Independent",
  86         "Track1",
  87         "Track2",
  88 };
  89
  90 static const struct lps_modelspec models[] = {
  91         { LPS_UNKNOWN, "Dummy", 0,
  92                 {
  93
  94                 }
  95         },
  96         { LPS_301, "LPS-301", 1,
  97                 {
  98                         /* Channel 1 */
  99                         { { 0, 32, 0.01 }, { 0.005, 2, 0.001 } },
 100                 },
 101         },
 102         { LPS_302, "LPS-302", 1,
 103                 {
 104                         /* Channel 1 */
 105                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 106                 },
 107         },
 108         { LPS_303, "LPS-303", 1,
 109                 {
 110                         /* Channel 1 */
 111                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 112                 },
 113         },
 114         { LPS_304, "LPS-304", 3,
 115                 {
 116                         /* Channel 1 */
 117                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 118                         /* Channel 2 */
 119                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 120                         /* Channel 3 */
 121                         { { 5, 5, 0.0 }, { 0.005, 3, 0.001 } },
 122                 },
 123         },
 124         { LPS_305, "LPS-305", 3,
 125                 {
 126                         /* Channel 1 */
 127                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 128                         /* Channel 2 */
 129                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 130                         /* Channel 3 */
 131                         { { 3.3, 5, 1.7 }, { 0.005, 3, 0.001 } },
 132                 },
 133         },
 134 };
 135
 136 static int init_lps301(struct sr_dev_driver *di, struct sr_context *sr_ctx)
 137 {
 138         return std_init(sr_ctx, di, LOG_PREFIX);
 139 }
 140
 141 /** Send command to device with va_list.
 142  */
 143 SR_PRIV int lps_send_va(struct sr_serial_dev_inst *serial, const char* fmt, va_list args)
 144 {
 145         int retc;
 146         char auxfmt[LINELEN_MAX];
 147         char buf[LINELEN_MAX];
 148
 149         snprintf(auxfmt, sizeof(auxfmt), "%s\r\n", fmt);
 150         vsnprintf(buf, sizeof(buf), auxfmt, args);
 151
 152         sr_spew("lps_send_va: \"%s\"", buf);
 153
 154         retc = serial_write_blocking(serial, buf, strlen(buf), 0);
 155
 156         if (retc < 0)
 157                 return SR_ERR;
 158
 159         return SR_OK;
 160 }
 161
 162 /** Send command to device.
 163  */
 164 SR_PRIV int lps_send_req(struct sr_serial_dev_inst *serial, const char* fmt, ...)
 165 {
 166         int retc;
 167         va_list args;
 168
 169         va_start(args, fmt);
 170         retc = lps_send_va(serial, fmt, args);
 171         va_end(args);
 172
 173         return retc;
 174 }
 175
 176 /** Send command and consume simple OK reply. */
 177 SR_PRIV int lps_cmd_ok(struct sr_serial_dev_inst *serial, const char* fmt, ...)
 178 {
 179         int retc;
 180         va_list args;
 181         char buf[LINELEN_MAX];
 182         char* bufptr;
 183         int  buflen;
 184
 185         /* Send command */
 186         va_start(args, fmt);
 187         retc = lps_send_va(serial, fmt, args);
 188         va_end(args);
 189
 190         if (retc != SR_OK)
 191                 return SR_ERR;
 192
 193         /* Read reply */
 194         buf[0] = '\0';
 195         bufptr = buf;
 196         buflen = sizeof(buf);
 197         retc = lps_read_reply(serial, &bufptr, &buflen);
 198         if ((retc == SR_OK) && (buflen == 0))
 199                 return SR_OK;
 200
 201         return SR_ERR;
 202 }
 203
 204 /** Send command and read reply string.
 205  *  \param reply Pointer to buffer of size LINELEN_MAX. Will be NUL-terminated.
 206  */
 207 SR_PRIV int lps_cmd_reply(char* reply, struct sr_serial_dev_inst *serial, const char* fmt, ...)
 208 {
 209         int retc;
 210         va_list args;
 211         char buf[LINELEN_MAX];
 212         char* bufptr;
 213         int  buflen;
 214
 215         reply[0] = '\0';
 216
 217         /* Send command */
 218         va_start(args, fmt);
 219         retc = lps_send_va(serial, fmt, args);
 220         va_end(args);
 221
 222         if (retc != SR_OK)
 223                 return SR_ERR;
 224
 225         /* Read reply */
 226         buf[0] = '\0';
 227         bufptr = buf;
 228         buflen = sizeof(buf);
 229         retc = lps_read_reply(serial, &bufptr, &buflen);
 230         if ((retc == SR_OK) && (buflen > 0)) {
 231                 strcpy(reply, buf);
 232                 return SR_OK;
 233         }
 234
 235         return SR_ERR;
 236 }
 237
 238 /** Process integer value returned by STATUS command. */
 239 SR_PRIV int lps_process_status(struct sr_dev_inst* sdi, int stat)
 240 {
 241         struct dev_context* devc;
 242         int tracking_mode;
 243
 244         devc = (struct dev_context*)sdi->priv;
 245
 246         sr_spew("Status: %d", stat);
 247         devc->channel_status[0].cc_mode = (stat & 0x01) != 0;
 248         sr_spew("Channel 1 %s mode", devc->channel_status[0].cc_mode?"CC":"CV");
 249         if (devc->model->num_channels > 1) {
 250                 devc->channel_status[1].cc_mode = (stat & 0x02) != 0;
 251                 sr_spew("Channel 2 %s mode", devc->channel_status[1].cc_mode?"CC":"CV");
 252
 253                 tracking_mode = (stat & 0x0c) >> 2;
 254                 switch (tracking_mode) {
 255                 case 0: devc->tracking_mode = 0;
 256                         break;
 257                 case 2: devc->tracking_mode = 1;
 258                         break;
 259                 case 3: devc->tracking_mode = 2;
 260                         break;
 261                 default:
 262                         sr_err("Illegal channel tracking mode %d!", tracking_mode);
 263                         devc->tracking_mode = 0;
 264                         break;
 265                 }
 266
 267                 sr_spew("Channel tracking: %d", devc->tracking_mode);
 268         }
 269         devc->channel_status[0].output_enabled = devc->channel_status[1].output_enabled = stat&0x040?TRUE:FALSE;
 270         sr_spew("Channel 1%s output: %s", devc->model->num_channels > 1?"+2":"", devc->channel_status[0].output_enabled?"ON":"OFF");
 271         if (devc->model->num_channels > 2) {
 272                 devc->channel_status[2].output_enabled = stat&0x010?TRUE:FALSE;
 273                 devc->channel_status[2].output_voltage_last = stat&0x020?3.3:5;
 274                 sr_spew("Channel 3 output: %s, U=%02f V, overload=%d",
 275                         devc->channel_status[2].output_enabled?"ON":"OFF",
 276                         devc->channel_status[2].output_voltage_last,
 277                         stat&0x080?1:0);
 278         }
 279         sr_spew("Fan=%d, beep=%d, CC output compensated=%d", stat&0x0100?1:0, stat&0x0200?1:0, stat&0x0400?1:0);
 280
 281         return SR_OK;
 282 }
 283
 284 /** Send STATUS commend and process status string. */
 285 SR_PRIV int lps_query_status(struct sr_dev_inst* sdi)
 286 {
 287         char buf[LINELEN_MAX];
 288         int stat;
 289         struct dev_context* devc;
 290
 291         devc = (struct dev_context*)sdi->priv;
 292
 293         devc->req_sent_at = g_get_real_time();
 294
 295         if (lps_cmd_reply(buf, sdi->conn, "STATUS") < 0) {
 296                 sr_err("%s: Failed to read status: %d %s", __func__, errno, strerror(errno));
 297                 return SR_ERR;
 298         }
 299
 300         if (sr_atoi(buf, &stat) != SR_OK)
 301                 return SR_ERR;
 302
 303         return lps_process_status(sdi, stat);
 304 }
 305
 306 static gint64 calc_timeout_ms(gint64 start_us)
 307 {
 308         gint64 result = REQ_TIMEOUT_MS - ((g_get_real_time() - start_us) / 1000);
 309
 310         if (result < 0)
 311                 return 0;
 312
 313         return result;
 314 }
 315
 316 /** Read message into buf until "OK" received.
 317  *  \retval SR_OK Msg received; buf and buflen contain result, if any except OK.
 318  *  \retval SR_ERR Error, including timeout.
 319 */
 320 SR_PRIV int lps_read_reply(struct sr_serial_dev_inst *serial, char **buf, int *buflen)
 321 {
 322         int retries;
 323         char buf2[LINELEN_MAX];
 324         char *buf2ptr;
 325         int buf2len;
 326         gint64 timeout_start;
 327
 328         *buf[0] = '\0';
 329
 330         /* Read one line. It is either a data message or "OK". */
 331         timeout_start = g_get_real_time();
 332         buf2len = *buflen;
 333         /* Up to 5 tries because serial_readline() will consume only one CR or LF per
 334          * call, but device sends up to 4 in a row. */
 335         for (retries = 0; retries < 5; retries++) {
 336                 *buflen = buf2len;
 337                 if (serial_readline(serial, buf, buflen, calc_timeout_ms(timeout_start)) != SR_OK)
 338                         return SR_ERR;
 339                 if (!strcmp(*buf, "OK")) { /* We got an OK! */
 340                         *buf[0] = '\0';
 341                         *buflen = 0;
 342                         return SR_OK;
 343                 }
 344                 if (*buflen > 0) /* We got a msg! */
 345                         break;
 346         }
 347
 348         /* A data msg is in buf (possibly ERROR), need to consume "OK". */
 349         buf2[0] = '\0';
 350         buf2ptr = buf2;
 351         for (retries = 0; retries < 5; retries++) {
 352                 buf2len = sizeof(buf2);
 353                 if (serial_readline(serial, &buf2ptr, &buf2len, calc_timeout_ms(timeout_start)) != SR_OK)
 354                         return SR_ERR;
 355
 356                 if (!strcmp(buf2ptr, "OK")) { /* We got an OK! */
 357                         if (!strcmp(*buf, "ERROR")) { /* OK came after msg ERROR! */
 358                                 sr_spew("ERROR found!");
 359                                 *buf[0] = '\0';
 360                                 *buflen = 0;
 361                                 return SR_ERR;
 362                         }
 363                         return SR_OK;
 364                 }
 365         }
 366
 367         return SR_ERR; /* Timeout! */
 368 }
 369
 370 /** Scan for LPS-300 series device.
 371  */
 372 static GSList *do_scan(lps_modelid modelid, struct sr_dev_driver *drv, GSList *options)
 373 {
 374         struct sr_dev_inst *sdi;
 375         struct drv_context *drvc;
 376         struct dev_context *devc;
 377         struct sr_serial_dev_inst *serial;
 378         struct sr_channel *ch;
 379         struct sr_channel_group *cg;
 380         GSList *devices;
 381         const char *conn, *serialcomm;
 382         int cnt;
 383         gchar buf[LINELEN_MAX];
 384         gchar channel[10];
 385         char *verstr;
 386
 387         sdi = NULL;
 388         devc = NULL;
 389         conn = serialcomm = NULL;
 390         devices = NULL;
 391
 392         drvc = drv->priv;
 393         drvc->instances = NULL;
 394
 395         sr_spew("scan() called!");
 396
 397         /* Process and check options. */
 398         if (sr_serial_extract_options(options, &conn, &serialcomm) != SR_OK)
 399                 return NULL;
 400         if (!serialcomm)
 401                 serialcomm = SERIALCOMM;
 402
 403         /* Init serial port. */
 404         serial = sr_serial_dev_inst_new(conn, serialcomm);
 405
 406         if (serial_open(serial, SERIAL_RDWR) != SR_OK)
 407                 goto exit_err;
 408
 409         /* Query and verify model string. */
 410         serial_flush(serial);
 411         if (lps_cmd_reply(buf, serial, "MODEL") != SR_OK)
 412                 return NULL;
 413
 414         /* Check model string. */
 415         if (strncmp(buf, "LPS-", 4)) {
 416                 sr_spew("Unknown model code \"%s\"!", buf);
 417                 return NULL;
 418         }
 419
 420         /* Bug in device FW 1.17, model number is empty, so this can't work with this FW! */
 421         if (modelid == LPS_UNKNOWN) {
 422                 g_strstrip(buf);
 423                 for (cnt = LPS_301; cnt <= LPS_305; cnt++) {
 424                         if (!strcmp(buf, models[cnt].modelstr)) {
 425                                 modelid = cnt;
 426                                 break;
 427                         }
 428                 }
 429                 if (modelid == LPS_UNKNOWN) {
 430                         sr_err("Unable to detect model from model string '%s'!", buf);
 431                         return NULL;
 432                 }
 433         }
 434
 435         /* Query version */
 436         verstr = NULL;
 437         if (lps_cmd_reply(buf, serial, "VERSION") == SR_OK) {
 438                 if (strncmp(buf, "Ver-", 4)) {
 439                         sr_spew("Version string %s not recognized.", buf);
 440                         goto exit_err;
 441                 }
 442
 443                 g_strstrip(buf);
 444                 verstr = buf + 4;
 445         }
 446         else  /* Bug in device FW 1.17: Querying version string fails while output is active.
 447                 Therefore just print an error message, but do not exit with error. */
 448                 sr_err("Failed to query for hardware version: %d %s", errno, strerror(errno));
 449
 450         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 451         sdi->status = SR_ST_INACTIVE;
 452         sdi->vendor = g_strdup(VENDOR_MOTECH);
 453         sdi->model = g_strdup(models[modelid].modelstr);
 454         sdi->version = g_strdup(verstr);
 455         sdi->driver = drv;
 456         sdi->inst_type = SR_INST_SERIAL;
 457         sdi->conn = serial;
 458
 459         devc = g_malloc0(sizeof(struct dev_context));
 460         devc->model = &models[modelid];
 461         devc->limit_samples = 0;
 462         devc->limit_msec = 0;
 463         devc->num_samples = 0;
 464         devc->elapsed_msec = g_timer_new();
 465
 466         sdi->priv = devc;
 467
 468         /* Setup channels and channel groups. */
 469         for (cnt = 0; cnt < models[modelid].num_channels; cnt++) {
 470                 snprintf(channel, sizeof(channel), "CH%d", cnt + 1);
 471                 ch = sr_channel_new(sdi, cnt, SR_CHANNEL_ANALOG, TRUE, channel);
 472
 473                 devc->channel_status[cnt].info = g_slist_append(NULL, ch);
 474
 475                 cg = g_malloc(sizeof(struct sr_channel_group));
 476                 snprintf(channel, sizeof(channel), "CG%d", cnt+1);
 477                 cg->name = g_strdup(channel);
 478                 cg->priv = NULL;
 479                 cg->channels = g_slist_append(NULL, ch);
 480
 481                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 482         }
 483
 484         drvc->instances = g_slist_append(drvc->instances, sdi);
 485         devices = g_slist_append(devices, sdi);
 486
 487         /* Query status */
 488         if (lps_query_status(sdi) != SR_OK)
 489                 goto exit_err;
 490
 491         serial_close(serial);
 492         if (!devices)
 493                 sr_serial_dev_inst_free(serial);
 494
 495         return devices;
 496
 497 exit_err:
 498         sr_info("%s: Error!", __func__);
 499
 500         if (serial) {
 501                 serial_close(serial);
 502                 sr_serial_dev_inst_free(serial);
 503         }
 504         g_free(devc);
 505         if (sdi)
 506                 sr_dev_inst_free(sdi);
 507
 508         return NULL;
 509 }
 510
 511 /** Scan for LPS-301 device. */
 512 static GSList *scan_lps301(struct sr_dev_driver *di, GSList *options)
 513 {
 514         return do_scan(LPS_301, di, options);
 515 }
 516
 517 static GSList *dev_list_lps301(const struct sr_dev_driver *di)
 518 {
 519         return ((struct drv_context *)(di->context))->instances;
 520 }
 521
 522 static void dev_clear_private(struct dev_context* devc)
 523 {
 524         int ch_idx;
 525
 526         /* Free channel_status.info (list only, data owned by sdi). */
 527         for (ch_idx = 0; ch_idx < devc->model->num_channels; ch_idx++)
 528                 g_slist_free(devc->channel_status[ch_idx].info);
 529
 530         g_timer_destroy(devc->elapsed_msec);
 531 }
 532
 533 static int dev_clear_lps301(const struct sr_dev_driver *di)
 534 {
 535         return std_dev_clear(di, (std_dev_clear_callback)dev_clear_private);
 536 }
 537
 538 static int cleanup(const struct sr_dev_driver *di)
 539 {
 540         return dev_clear_lps301(di);
 541 }
 542
 543 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 544                 const struct sr_channel_group *cg)
 545 {
 546         struct dev_context *devc;
 547         struct sr_channel *ch;
 548         int ch_idx;
 549
 550         if (!sdi)
 551                 return SR_ERR_ARG;
 552
 553         devc = sdi->priv;
 554
 555         if (!cg) {
 556                 /* No channel group: global options. */
 557                 switch (key) {
 558                 case SR_CONF_LIMIT_SAMPLES:
 559                         *data = g_variant_new_uint64(devc->limit_samples);
 560                         break;
 561                 case SR_CONF_LIMIT_MSEC:
 562                         *data = g_variant_new_uint64(devc->limit_msec);
 563                         break;
 564                 case SR_CONF_CHANNEL_CONFIG:
 565                         *data = g_variant_new_string(channel_modes[devc->tracking_mode]);
 566                         break;
 567                 default:
 568                         return SR_ERR_NA;
 569                 }
 570         } else {
 571                 /* We only ever have one channel per channel group in this driver. */
 572                 ch = cg->channels->data;
 573                 ch_idx = ch->index;
 574                 switch (key) {
 575                 case SR_CONF_VOLTAGE:
 576                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_voltage_last);
 577                         break;
 578                 case SR_CONF_VOLTAGE_TARGET:
 579                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_voltage_max);
 580                         break;
 581                 case SR_CONF_CURRENT:
 582                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_current_last);
 583                         break;
 584                 case SR_CONF_CURRENT_LIMIT:
 585                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_current_max);
 586                         break;
 587                 case SR_CONF_ENABLED:
 588                         *data = g_variant_new_boolean(devc->channel_status[ch_idx].output_enabled);
 589                         break;
 590                 default:
 591                         return SR_ERR_NA;
 592                 }
 593         }
 594
 595         return SR_OK;
 596 }
 597
 598 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 599                 const struct sr_channel_group *cg)
 600 {
 601         struct dev_context *devc;
 602         struct sr_channel *ch;
 603         gdouble dval;
 604         int ch_idx;
 605         const char *sval;
 606         gboolean bval;
 607         int idx;
 608         gboolean found;
 609
 610         if (sdi->status != SR_ST_ACTIVE)
 611                 return SR_ERR_DEV_CLOSED;
 612
 613         devc = sdi->priv;
 614
 615         /* Cannot change settings while acquisition active, would cause a mess with commands.
 616          * Changing this would be possible, but tricky. */
 617         if (devc->acq_running)
 618                 return SR_ERR_NA;
 619
 620         if (!cg) {
 621                 /* No channel group: global options. */
 622                 switch (key) {
 623                 case SR_CONF_LIMIT_MSEC:
 624                         devc->limit_msec = g_variant_get_uint64(data);
 625                         break;
 626                 case SR_CONF_LIMIT_SAMPLES:
 627                         devc->limit_samples = g_variant_get_uint64(data);
 628                         break;
 629                 case SR_CONF_CHANNEL_CONFIG:
 630                         sval = g_variant_get_string(data, NULL);
 631                         found = FALSE;
 632                         for (idx = 0; idx < (int)ARRAY_SIZE(channel_modes); idx++) {
 633                                 if (!strcmp(sval, channel_modes[idx])) {
 634                                         found = TRUE;
 635                                         if (devc->tracking_mode == idx)
 636                                                 break;  /* Nothing to do! */
 637                                         devc->tracking_mode = idx;
 638                                         if (devc->model->modelid >= LPS_304) /* No use to set anything in the smaller models. */
 639                                                 return lps_cmd_ok(sdi->conn, "TRACK%1d", devc->tracking_mode);
 640                                 }
 641                                 if (devc->model->modelid <= LPS_303) /* Only first setting possible for smaller models. */
 642                                         break;
 643                         }
 644                         if (!found)
 645                                 return SR_ERR_ARG;
 646                         break;
 647                 default:
 648                         return SR_ERR_NA;
 649                 }
 650         } else {
 651                 /* Channel group specified: per-channel options. */
 652                 /* We only ever have one channel per channel group in this driver. */
 653                 ch = cg->channels->data;
 654                 ch_idx = ch->index;
 655
 656                 switch (key) {
 657                 case SR_CONF_VOLTAGE_TARGET:
 658                         dval = g_variant_get_double(data);
 659                         if (dval < 0 || dval > devc->model->channels[ch_idx].voltage[1])
 660                                 return SR_ERR_ARG;
 661                         if (ch_idx == 2) {
 662                                 if (devc->model->modelid < LPS_304)
 663                                         return SR_ERR_ARG;
 664
 665                                 if (fabs(dval - 5.000) <= 0.001)
 666                                         dval = 5.0;
 667                                 else if ((devc->model->modelid >= LPS_305) && (fabs(dval - 3.300) <= 0.001))
 668                                         dval = 3.3;
 669                                 else return SR_ERR_ARG;
 670                         }
 671
 672                         devc->channel_status[ch_idx].output_voltage_max = dval;
 673                         if (ch_idx == 2)
 674                                 return lps_cmd_ok(sdi->conn, "VDD%1.0f", trunc(dval));
 675                         else
 676                                 return lps_cmd_ok(sdi->conn, "VSET%d %05.3f", ch_idx+1, dval);
 677                         break;
 678                 case SR_CONF_CURRENT_LIMIT:
 679                         dval = g_variant_get_double(data);
 680                         if (dval < 0 || dval > devc->model->channels[ch_idx].current[1])
 681                                 return SR_ERR_ARG;
 682                         if (ch_idx == 2) /* No current setting for CH3. */
 683                                 return SR_ERR_NA;
 684                         devc->channel_status[ch_idx].output_current_max = dval;
 685                         return lps_cmd_ok(sdi->conn, "ISET%d %05.4f", ch_idx+1, dval);
 686                         break;
 687                 case SR_CONF_ENABLED:
 688                         bval = g_variant_get_boolean(data);
 689                         if (bval == devc->channel_status[ch_idx].output_enabled) /* Nothing to do. */
 690                                 break;
 691                         devc->channel_status[ch_idx].output_enabled = bval;
 692                         if (ch_idx != 2) { /* Channels 1,2 can be set only together. */
 693                                 devc->channel_status[ch_idx^1].output_enabled = bval;
 694                                 return lps_cmd_ok(sdi->conn, "OUT%1d", (int)bval);
 695                         } else { /* Channel 3: No command to disable output, set voltage to 0 instead. */
 696                                 if (bval)
 697                                         return lps_cmd_ok(sdi->conn, "VDD%1.0f", devc->channel_status[ch_idx].output_voltage_max);
 698                                 else
 699                                         return lps_cmd_ok(sdi->conn, "VDD0");
 700                         }
 701                         break;
 702                 default:
 703                         return SR_ERR_NA;
 704                 }
 705         }
 706
 707         return SR_OK;
 708 }
 709
 710 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 711                 const struct sr_channel_group *cg)
 712 {
 713         struct dev_context *devc;
 714         struct sr_channel *ch;
 715         int ch_idx, i;
 716         GVariant *gvar;
 717         GVariantBuilder gvb;
 718
 719         /* Driver options, no device instance necessary. */
 720         switch (key) {
 721         case SR_CONF_SCAN_OPTIONS:
 722                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 723                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 724                 return SR_OK;
 725         case SR_CONF_DEVICE_OPTIONS:
 726                 if (sdi != NULL)
 727                         break;
 728                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 729                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 730                 return SR_OK;
 731         default:
 732                 if (!sdi)
 733                         return SR_ERR_ARG;
 734                 devc = sdi->priv;
 735                 break;
 736         }
 737
 738         /* Device options, independent from channel groups. */
 739         if (!cg) {
 740                 switch (key) {
 741                 case SR_CONF_DEVICE_OPTIONS:
 742                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 743                                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 744                         return SR_OK;
 745                 case SR_CONF_CHANNEL_CONFIG:
 746                         if (devc->model->modelid <= LPS_303) {
 747                                 /* The 1-channel models. */
 748                                 *data = g_variant_new_strv(channel_modes, 1);
 749                         } else {
 750                                 /* The other models support all modes. */
 751                                 *data = g_variant_new_strv(channel_modes, ARRAY_SIZE(channel_modes));
 752                         }
 753                         return SR_OK;
 754                 default:
 755                         return SR_ERR_NA;
 756                 }
 757         }
 758
 759         /* Device options, depending on channel groups. */
 760         ch = cg->channels->data;
 761         ch_idx = ch->index;
 762         switch (key) {
 763         case SR_CONF_DEVICE_OPTIONS:
 764                 if ((ch_idx == 0) || (ch_idx == 1)) /* CH1, CH2 */
 765                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 766                                   devopts_ch12, ARRAY_SIZE(devopts_ch12), sizeof(uint32_t));
 767                 else /* Must be CH3 */
 768                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 769                                   devopts_ch3, ARRAY_SIZE(devopts_ch3), sizeof(uint32_t));
 770                 break;
 771         case SR_CONF_VOLTAGE_TARGET:
 772                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 773                 /* Min, max, step. */
 774                 for (i = 0; i < 3; i++) {
 775                         gvar = g_variant_new_double(devc->model->channels[ch_idx].voltage[i]);
 776                         g_variant_builder_add_value(&gvb, gvar);
 777                 }
 778                 *data = g_variant_builder_end(&gvb);
 779                 break;
 780         case SR_CONF_CURRENT_LIMIT:
 781                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 782                 /* Min, max, step. */
 783                 for (i = 0; i < 3; i++) {
 784                         gvar = g_variant_new_double(devc->model->channels[ch_idx].current[i]);
 785                         g_variant_builder_add_value(&gvb, gvar);
 786                 }
 787                 *data = g_variant_builder_end(&gvb);
 788                 break;
 789         default:
 790                 return SR_ERR_NA;
 791         }
 792
 793         return SR_OK;
 794 }
 795
 796 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 797                                     void *cb_data)
 798 {
 799         struct dev_context *devc;
 800         struct sr_serial_dev_inst *serial;
 801
 802         if (sdi->status != SR_ST_ACTIVE)
 803                 return SR_ERR_DEV_CLOSED;
 804
 805         devc = sdi->priv;
 806
 807         devc->acq_running = TRUE;
 808
 809         serial = sdi->conn;
 810         serial_source_add(sdi->session, serial, G_IO_IN, 50,
 811                         motech_lps_30x_receive_data, (void *)sdi);
 812         std_session_send_df_header(cb_data, LOG_PREFIX);
 813
 814         /* Start timer, if required. */
 815         if (devc->limit_msec)
 816                 g_timer_start(devc->elapsed_msec);
 817
 818         devc->acq_req = AQ_NONE;
 819         /* Do not start polling device here, the read function will do it in 50 ms. */
 820
 821         return SR_OK;
 822 }
 823
 824 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 825 {
 826         struct dev_context *devc;
 827
 828         /* Stop timer, if required. */
 829         if (sdi && (devc = sdi->priv) && devc->limit_msec)
 830                 g_timer_stop(devc->elapsed_msec);
 831
 832         return std_serial_dev_acquisition_stop(sdi, cb_data, std_serial_dev_close,
 833                         sdi->conn, LOG_PREFIX);
 834 }
 835
 836 SR_PRIV struct sr_dev_driver motech_lps_301_driver_info = {
 837         .name = "motech-lps-301",
 838         .longname = "Motech LPS-301",
 839         .api_version = 1,
 840         .init = init_lps301,
 841         .cleanup = cleanup,
 842         .scan = scan_lps301,
 843         .dev_list = dev_list_lps301,
 844         .dev_clear = dev_clear_lps301,
 845         .config_get = config_get,
 846         .config_set = config_set,
 847         .config_list = config_list,
 848         .dev_open = std_serial_dev_open,
 849         .dev_close = std_serial_dev_close,
 850         .dev_acquisition_start = dev_acquisition_start,
 851         .dev_acquisition_stop = dev_acquisition_stop,
 852         .context = NULL,
 853 };