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
  31 #include "protocol.h"
  32
  33 /* Forward declarations */
  34 SR_PRIV struct sr_dev_driver motech_lps_301_driver_info;
  35 SR_PRIV int lps_read_reply(struct sr_serial_dev_inst *serial, char **buf, int *buflen);
  36 SR_PRIV int lps_send_va(struct sr_serial_dev_inst *serial, const char* fmt, va_list args);
  37 SR_PRIV int lps_cmd_ok(struct sr_serial_dev_inst *serial, const char* fmt, ...);
  38 SR_PRIV int lps_cmd_reply(char* reply, struct sr_serial_dev_inst *serial, const char* fmt, ...);
  39 SR_PRIV int lps_query_status(struct sr_dev_inst* sdi);
  40
  41 /* Serial communication parameters */
  42 #define SERIALCOMM "2400/8n1/dtr=1/rts=1/flow=0"
  43
  44 #define VENDOR_MOTECH "Motech"
  45
  46 /** Driver scanning options. */
  47 static const int32_t hwopts[] = {
  48         SR_CONF_CONN,
  49         SR_CONF_SERIALCOMM,
  50 };
  51
  52 /** Hardware capabilities generic. */
  53 static const int32_t hwcaps[] = {
  54         /* Device class */
  55         SR_CONF_POWER_SUPPLY,
  56         /* Aquisition modes. */
  57         SR_CONF_LIMIT_SAMPLES,
  58         SR_CONF_LIMIT_MSEC,
  59         SR_CONF_CONTINUOUS,
  60         /* Device configuration */
  61         SR_CONF_OUTPUT_CHANNEL,
  62 };
  63
  64 /** Hardware capabilities channel 1, 2. */
  65 static const int32_t hwcaps_ch12[] = {
  66         SR_CONF_OUTPUT_VOLTAGE,
  67         SR_CONF_OUTPUT_VOLTAGE_MAX,
  68         SR_CONF_OUTPUT_CURRENT,
  69         SR_CONF_OUTPUT_CURRENT_MAX,
  70         SR_CONF_OUTPUT_ENABLED,
  71 };
  72
  73 /** Hardware capabilities channel 3. (LPS-304/305 only). */
  74 static const int32_t hwcaps_ch3[] = {
  75         SR_CONF_OUTPUT_VOLTAGE,
  76         SR_CONF_OUTPUT_ENABLED,
  77 };
  78
  79 static const char *channel_modes[] = {
  80         "Independent",
  81         "Track1",
  82         "Track2",
  83 };
  84
  85 static struct lps_modelspec models[] = {
  86         { LPS_UNKNOWN, "Dummy", 0,
  87                 {
  88
  89                 }
  90         },
  91         { LPS_301, "LPS-301", 1,
  92                 {
  93                         /* Channel 1 */
  94                         { { 0, 32, 0.01 }, { 0.005, 2, 0.001 } },
  95                 },
  96         },
  97         { LPS_302, "LPS-302", 1,
  98                 {
  99                         /* Channel 1 */
 100                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 101                 },
 102         },
 103         { LPS_303, "LPS-303", 1,
 104                 {
 105                         /* Channel 1 */
 106                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 107                 },
 108         },
 109         { LPS_304, "LPS-304", 3,
 110                 {
 111                         /* Channel 1 */
 112                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 113                         /* Channel 2 */
 114                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 115                         /* Channel 3 */
 116                         { { 5, 5, 0.0 }, { 0.005, 3, 0.001 } },
 117                 },
 118         },
 119         { LPS_305, "LPS-305", 3,
 120                 {
 121                         /* Channel 1 */
 122                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 123                         /* Channel 2 */
 124                         { { 0, 32, 0.01 }, { 0.005, 3, 0.001 } },
 125                         /* Channel 3 */
 126                         { { 3.3, 5, 1.7 }, { 0.005, 3, 0.001 } },
 127                 },
 128         },
 129 };
 130
 131 static int init_lps301(struct sr_context *sr_ctx)
 132 {
 133         return std_init(sr_ctx, &motech_lps_301_driver_info, LOG_PREFIX);
 134 }
 135
 136 /** Send command to device with va_list.
 137  */
 138 SR_PRIV int lps_send_va(struct sr_serial_dev_inst *serial, const char* fmt, va_list args)
 139 {
 140         int retc;
 141         char auxfmt[LINELEN_MAX];
 142         char buf[LINELEN_MAX];
 143
 144         snprintf(auxfmt, sizeof(auxfmt), "%s\r\n", fmt);
 145         vsnprintf(buf, sizeof(buf), auxfmt, args);
 146
 147         sr_spew("lps_send_va: \"%s\"", buf);
 148
 149         retc = serial_write_nonblocking(serial, buf, strlen(buf));
 150
 151         if (retc < 0)
 152                 return SR_ERR;
 153
 154         return SR_OK;
 155 }
 156
 157 /** Send command to device.
 158  */
 159 SR_PRIV int lps_send_req(struct sr_serial_dev_inst *serial, const char* fmt, ...)
 160 {
 161         int retc;
 162         va_list args;
 163
 164         va_start(args, fmt);
 165         retc = lps_send_va(serial, fmt, args);
 166         va_end(args);
 167
 168         return retc;
 169 }
 170
 171 /** Send command and consume simple OK reply. */
 172 SR_PRIV int lps_cmd_ok(struct sr_serial_dev_inst *serial, const char* fmt, ...)
 173 {
 174         int retc;
 175         va_list args;
 176         char buf[LINELEN_MAX];
 177         char* bufptr;
 178         int  buflen;
 179
 180         /* Send command */
 181         va_start(args, fmt);
 182         retc = lps_send_va(serial, fmt, args);
 183         va_end(args);
 184
 185         if (retc != SR_OK)
 186                 return SR_ERR;
 187
 188         /* Read reply */
 189         buf[0] = '\0';
 190         bufptr = buf;
 191         buflen = sizeof(buf);
 192         retc = lps_read_reply(serial, &bufptr, &buflen);
 193         if ((retc == SR_OK) && (buflen == 0))
 194                 return SR_OK;
 195
 196         return SR_ERR;
 197 }
 198
 199 /** Send command and read reply string.
 200  *  \param reply Pointer to buffer of size LINELEN_MAX. Will be NUL-terminated.
 201  */
 202 SR_PRIV int lps_cmd_reply(char* reply, struct sr_serial_dev_inst *serial, const char* fmt, ...)
 203 {
 204         int retc;
 205         va_list args;
 206         char buf[LINELEN_MAX];
 207         char* bufptr;
 208         int  buflen;
 209
 210         reply[0] = '\0';
 211
 212         /* Send command */
 213         va_start(args, fmt);
 214         retc = lps_send_va(serial, fmt, args);
 215         va_end(args);
 216
 217         if (retc != SR_OK)
 218                 return SR_ERR;
 219
 220         /* Read reply */
 221         buf[0] = '\0';
 222         bufptr = buf;
 223         buflen = sizeof(buf);
 224         retc = lps_read_reply(serial, &bufptr, &buflen);
 225         if ((retc == SR_OK) && (buflen > 0)) {
 226                 strcpy(reply, buf);
 227                 return SR_OK;
 228         }
 229
 230         return SR_ERR;
 231 }
 232
 233 /** Process integer value returned by STATUS command. */
 234 SR_PRIV int lps_process_status(struct sr_dev_inst* sdi, int stat)
 235 {
 236         struct dev_context* devc;
 237         int tracking_mode;
 238
 239         devc = (struct dev_context*)sdi->priv;
 240
 241         sr_spew("Status: %d", stat);
 242         devc->channel_status[0].cc_mode = (stat & 0x01) != 0;
 243         sr_spew("Channel 1 %s mode", devc->channel_status[0].cc_mode?"CC":"CV");
 244         if (devc->model->num_channels > 1) {
 245                 devc->channel_status[1].cc_mode = (stat & 0x02) != 0;
 246                 sr_spew("Channel 2 %s mode", devc->channel_status[1].cc_mode?"CC":"CV");
 247
 248                 tracking_mode = (stat & 0x0c) >> 2;
 249                 switch (tracking_mode) {
 250                 case 0: devc->tracking_mode = 0;
 251                         break;
 252                 case 2: devc->tracking_mode = 1;
 253                         break;
 254                 case 3: devc->tracking_mode = 2;
 255                         break;
 256                 default:
 257                         sr_err("Illegal channel tracking mode %d!", tracking_mode);
 258                         devc->tracking_mode = 0;
 259                         break;
 260                 }
 261
 262                 sr_spew("Channel tracking: %d", devc->tracking_mode);
 263         }
 264         devc->channel_status[0].output_enabled = devc->channel_status[1].output_enabled = stat&0x040?TRUE:FALSE;
 265         sr_spew("Channel 1%s output: %s", devc->model->num_channels > 1?"+2":"", devc->channel_status[0].output_enabled?"ON":"OFF");
 266         if (devc->model->num_channels > 2) {
 267                 devc->channel_status[2].output_enabled = stat&0x010?TRUE:FALSE;
 268                 devc->channel_status[2].output_voltage_last = stat&0x020?3.3:5;
 269                 sr_spew("Channel 3 output: %s, U=%02f V, overload=%d",
 270                         devc->channel_status[2].output_enabled?"ON":"OFF",
 271                         devc->channel_status[2].output_voltage_last,
 272                         stat&0x080?1:0);
 273         }
 274         sr_spew("Fan=%d, beep=%d, CC output compensated=%d", stat&0x0100?1:0, stat&0x0200?1:0, stat&0x0400?1:0);
 275
 276         return SR_OK;
 277 }
 278
 279 /** Send STATUS commend and process status string. */
 280 SR_PRIV int lps_query_status(struct sr_dev_inst* sdi)
 281 {
 282         char buf[LINELEN_MAX];
 283         int stat;
 284         struct dev_context* devc;
 285
 286         devc = (struct dev_context*)sdi->priv;
 287
 288         devc->req_sent_at = g_get_real_time();
 289
 290         if (lps_cmd_reply(buf, sdi->conn, "STATUS") < 0) {
 291                 sr_err("%s: Failed to read status: %d %s", __func__, errno, strerror(errno));
 292                 return SR_ERR;
 293         }
 294
 295         if (sr_atoi(buf, &stat) != SR_OK)
 296                 return SR_ERR;
 297
 298         return lps_process_status(sdi, stat);
 299 }
 300
 301 static gint64 calc_timeout_ms(gint64 start_us)
 302 {
 303         gint64 result = REQ_TIMEOUT_MS - ((g_get_real_time() - start_us) / 1000);
 304
 305         if (result < 0)
 306                 return 0;
 307
 308         return result;
 309 }
 310
 311 /** Read message into buf until "OK" received.
 312  *  \retval SR_OK Msg received; buf and buflen contain result, if any except OK.
 313  *  \retval SR_ERR Error, including timeout.
 314 */
 315 SR_PRIV int lps_read_reply(struct sr_serial_dev_inst *serial, char **buf, int *buflen)
 316 {
 317         int retries;
 318         char buf2[LINELEN_MAX];
 319         char *buf2ptr;
 320         int buf2len;
 321         gint64 timeout_start;
 322
 323         *buf[0] = '\0';
 324
 325         /* Read one line. It is either a data message or "OK". */
 326         timeout_start = g_get_real_time();
 327         buf2len = *buflen;
 328         /* Up to 5 tries because serial_readline() will consume only one CR or LF per
 329          * call, but device sends up to 4 in a row. */
 330         for (retries = 0; retries < 5; retries++) {
 331                 *buflen = buf2len;
 332                 if (serial_readline(serial, buf, buflen, calc_timeout_ms(timeout_start)) != SR_OK)
 333                         return SR_ERR;
 334                 if (!strcmp(*buf, "OK")) { /* We got an OK! */
 335                         *buf[0] = '\0';
 336                         *buflen = 0;
 337                         return SR_OK;
 338                 }
 339                 if (*buflen > 0) /* We got a msg! */
 340                         break;
 341         }
 342
 343         /* A data msg is in buf (possibly ERROR), need to consume "OK". */
 344         buf2[0] = '\0';
 345         buf2ptr = buf2;
 346         for (retries = 0; retries < 5; retries++) {
 347                 buf2len = sizeof(buf2);
 348                 if (serial_readline(serial, &buf2ptr, &buf2len, calc_timeout_ms(timeout_start)) != SR_OK)
 349                         return SR_ERR;
 350
 351                 if (!strcmp(buf2ptr, "OK")) { /* We got an OK! */
 352                         if (!strcmp(*buf, "ERROR")) { /* OK came after msg ERROR! */
 353                                 sr_spew("ERROR found!");
 354                                 *buf[0] = '\0';
 355                                 *buflen = 0;
 356                                 return SR_ERR;
 357                         }
 358                         return SR_OK;
 359                 }
 360         }
 361
 362         return SR_ERR; /* Timeout! */
 363 }
 364
 365 /** Scan for LPS-300 series device.
 366  */
 367 static GSList *do_scan(lps_modelid modelid, struct sr_dev_driver *drv, GSList *options)
 368 {
 369         struct sr_dev_inst *sdi;
 370         struct drv_context *drvc;
 371         struct dev_context *devc;
 372         struct sr_serial_dev_inst *serial;
 373         struct sr_channel *ch;
 374         struct sr_channel_group *cg;
 375         GSList *devices;
 376         const char *conn, *serialcomm;
 377         int cnt;
 378         gchar  buf[LINELEN_MAX];
 379         gchar channel[10];
 380         char*  verstr;
 381
 382         sdi = NULL;
 383         devc = NULL;
 384         conn = serialcomm = NULL;
 385         devices = NULL;
 386
 387         drvc = drv->priv;
 388         drvc->instances = NULL;
 389
 390         sr_spew("scan() called!");
 391
 392         /* Process and check options. */
 393         if (sr_serial_extract_options(options, &conn, &serialcomm) != SR_OK)
 394                 return NULL;
 395         if (!serialcomm)
 396                 serialcomm = SERIALCOMM;
 397
 398         /* Init serial port. */
 399         if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
 400                 return NULL;
 401
 402         if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
 403                 goto exit_err;
 404
 405         /* Query and verify model string. */
 406         serial_flush(serial);
 407         if (lps_cmd_reply(buf, serial, "MODEL") != SR_OK)
 408                 return NULL;
 409
 410         /* Check model string. */
 411         if (strncmp(buf, "LPS-", 4)) {
 412                 sr_spew("Unknown model code \"%s\"!", buf);
 413                 return NULL;
 414         }
 415
 416         /* Bug in device FW 1.17, model number is empty, so this can't work with this FW! */
 417         if (modelid == LPS_UNKNOWN) {
 418                 g_strstrip(buf);
 419                 for (cnt = LPS_301; cnt <= LPS_305; cnt++) {
 420                         if (!strcmp(buf, models[cnt].modelstr)) {
 421                                 modelid = cnt;
 422                                 break;
 423                         }
 424                 }
 425                 if (modelid == LPS_UNKNOWN) {
 426                         sr_err("Unable to detect model from model string '%s'!", buf);
 427                         return NULL;
 428                 }
 429         }
 430
 431         /* Query version */
 432         verstr = NULL;
 433         if (lps_cmd_reply(buf, serial, "VERSION") == SR_OK) {
 434                 if (strncmp(buf, "Ver-", 4)) {
 435                         sr_spew("Version string %s not recognized.", buf);
 436                         goto exit_err;
 437                 }
 438
 439
 440                 g_strstrip(buf);
 441                 verstr = buf + 4;
 442         }
 443         else  /* Bug in device FW 1.17: Quering version string fails while output is active.
 444                 Therefore just print an error message, but do not exit with error. */
 445                 sr_err("Failed to query for hardware version: %d %s", errno, strerror(errno));
 446
 447         sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_MOTECH, models[modelid].modelstr, verstr);
 448         sdi->driver = drv;
 449         sdi->inst_type = SR_INST_SERIAL;
 450         sdi->conn = serial;
 451
 452         devc = g_malloc0(sizeof(struct dev_context));
 453         devc->model = &models[modelid];
 454         devc->limit_samples = 0;
 455         devc->limit_msec = 0;
 456         devc->num_samples = 0;
 457         devc->elapsed_msec = g_timer_new();
 458
 459         sdi->priv = devc;
 460
 461         /* Setup channels and channel groups. */
 462         for (cnt = 0; cnt < models[modelid].num_channels; cnt++) {
 463                 snprintf(channel, sizeof(channel), "CH%d", cnt + 1);
 464                 ch = sr_channel_new(cnt, SR_CHANNEL_ANALOG, TRUE, channel);
 465                 sdi->channels = g_slist_append(sdi->channels, ch);
 466
 467                 devc->channel_status[cnt].info = g_slist_append(NULL, ch);
 468
 469                 cg = g_malloc(sizeof(struct sr_channel_group));
 470                 snprintf(channel, sizeof(channel), "CG%d", cnt+1);
 471                 cg->name = g_strdup(channel);
 472                 cg->priv = NULL;
 473                 cg->channels = g_slist_append(NULL, ch);
 474
 475                 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
 476         }
 477
 478         drvc->instances = g_slist_append(drvc->instances, sdi);
 479         devices = g_slist_append(devices, sdi);
 480
 481         /* Query status */
 482         if (lps_query_status(sdi) != SR_OK)
 483                 goto exit_err;
 484
 485         serial_close(serial);
 486         if (!devices)
 487                 sr_serial_dev_inst_free(serial);
 488
 489         return devices;
 490
 491 exit_err:
 492         sr_info("%s: Error!", __func__);
 493
 494         if (serial) {
 495                 serial_close(serial);
 496                 sr_serial_dev_inst_free(serial);
 497         }
 498         if (devc)
 499                 g_free(devc);
 500         if (sdi)
 501                 sr_dev_inst_free(sdi);
 502
 503         return NULL;
 504 }
 505
 506 /** Scan for LPS-301 device. */
 507 static GSList *scan_lps301(GSList *options)
 508 {
 509         return do_scan(LPS_301, &motech_lps_301_driver_info, options);
 510 }
 511
 512 static GSList *doDevList(struct sr_dev_driver *drv)
 513 {
 514         return ((struct drv_context *)(drv->priv))->instances;
 515 }
 516
 517 static GSList *dev_list_lps301(void)
 518 {
 519         return doDevList(&motech_lps_301_driver_info);
 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(void)
 534 {
 535         return std_dev_clear(&motech_lps_301_driver_info, (std_dev_clear_callback)dev_clear_private);
 536 }
 537
 538 static int cleanup(void)
 539 {
 540         return dev_clear_lps301();
 541 }
 542
 543 static int config_get(int 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_OUTPUT_CHANNEL:
 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_OUTPUT_VOLTAGE:
 576                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_voltage_last);
 577                         break;
 578                 case SR_CONF_OUTPUT_VOLTAGE_MAX:
 579                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_voltage_max);
 580                         break;
 581                 case SR_CONF_OUTPUT_CURRENT:
 582                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_current_last);
 583                         break;
 584                 case SR_CONF_OUTPUT_CURRENT_MAX:
 585                         *data = g_variant_new_double(devc->channel_status[ch_idx].output_current_max);
 586                         break;
 587                 case SR_CONF_OUTPUT_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(int 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                         if (g_variant_get_uint64(data) == 0) {
 625                                 sr_err("LIMIT_MSEC can't be 0.");
 626                                 return SR_ERR;
 627                         }
 628                         devc->limit_msec = g_variant_get_uint64(data);
 629                         sr_dbg("Setting time limit to %" PRIu64 "ms.",
 630                                 devc->limit_msec);
 631                         break;
 632                 case SR_CONF_LIMIT_SAMPLES:
 633                         devc->limit_samples = g_variant_get_uint64(data);
 634                         sr_dbg("Setting sample limit to %" PRIu64 ".",
 635                                 devc->limit_samples);
 636                         break;
 637                 case SR_CONF_OUTPUT_CHANNEL:
 638                         sval = g_variant_get_string(data, NULL);
 639                         found = FALSE;
 640                         for (idx = 0; idx < (int)ARRAY_SIZE(channel_modes); idx++)
 641                         {
 642                                 if (!strcmp(sval, channel_modes[idx])) {
 643                                         found = TRUE;
 644                                         if (devc->tracking_mode == idx)
 645                                                 break;  /* Nothing to do! */
 646                                         devc->tracking_mode = idx;
 647                                         if (devc->model->modelid >= LPS_304) /* No use to set anything in the smaller models. */
 648                                                 return lps_cmd_ok(sdi->conn, "TRACK%1d", devc->tracking_mode);
 649                                 }
 650                                 if (devc->model->modelid <= LPS_303) /* Only first setting possible for smaller models. */
 651                                         break;
 652                         }
 653                         if (!found) {
 654                                 return SR_ERR_ARG;
 655                         }
 656                         break;
 657                 default:
 658                         return SR_ERR_NA;
 659                 }
 660         } else {
 661                 /* Channel group specified: per-channel options. */
 662                 /* We only ever have one channel per channel group in this driver. */
 663                 ch = cg->channels->data;
 664                 ch_idx = ch->index;
 665
 666                 switch (key) {
 667                 case SR_CONF_OUTPUT_VOLTAGE_MAX:
 668                         dval = g_variant_get_double(data);
 669                         if (dval < 0 || dval > devc->model->channels[ch_idx].voltage[1])
 670                                 return SR_ERR_ARG;
 671                         if (ch_idx == 2) {
 672                                 if (devc->model->modelid < LPS_304)
 673                                         return SR_ERR_ARG;
 674
 675                                 if (fabs(dval - 5.000) <= 0.001)
 676                                         dval = 5.0;
 677                                 else if ((devc->model->modelid >= LPS_305) && (fabs(dval - 3.300) <= 0.001))
 678                                         dval = 3.3;
 679                                 else return SR_ERR_ARG;
 680                         }
 681
 682                         devc->channel_status[ch_idx].output_voltage_max = dval;
 683                         if (ch_idx == 2)
 684                                 return lps_cmd_ok(sdi->conn, "VDD%1.0f", trunc(dval));
 685                         else
 686                                 return lps_cmd_ok(sdi->conn, "VSET%d %05.3f", ch_idx+1, dval);
 687                         break;
 688                 case SR_CONF_OUTPUT_CURRENT_MAX:
 689                         dval = g_variant_get_double(data);
 690                         if (dval < 0 || dval > devc->model->channels[ch_idx].current[1])
 691                                 return SR_ERR_ARG;
 692                         if (ch_idx == 2) /* No current setting for CH3. */
 693                                 return SR_ERR_NA;
 694                         devc->channel_status[ch_idx].output_current_max = dval;
 695                         return lps_cmd_ok(sdi->conn, "ISET%d %05.4f", ch_idx+1, dval);
 696                         break;
 697                 case SR_CONF_OUTPUT_ENABLED:
 698                         bval = g_variant_get_boolean(data);
 699                         if (bval == devc->channel_status[ch_idx].output_enabled) /* Nothing to do. */
 700                                 break;
 701                         devc->channel_status[ch_idx].output_enabled = bval;
 702                         if (ch_idx != 2) { /* Channels 1,2 can be set only together. */
 703                                 devc->channel_status[ch_idx^1].output_enabled = bval;
 704                                 return lps_cmd_ok(sdi->conn, "OUT%1d", (int)bval);
 705                         } else { /* Channel 3: No command to disable output, set voltage to 0 instead. */
 706                                 if (bval)
 707                                         return lps_cmd_ok(sdi->conn, "VDD%1.0f", devc->channel_status[ch_idx].output_voltage_max);
 708                                 else
 709                                         return lps_cmd_ok(sdi->conn, "VDD0");
 710                         }
 711                         break;
 712                 default:
 713                         return SR_ERR_NA;
 714                 }
 715         }
 716
 717         return SR_OK;
 718 }
 719
 720 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
 721                 const struct sr_channel_group *cg)
 722 {
 723         struct dev_context *devc;
 724         struct sr_channel *ch;
 725         int ch_idx, i;
 726         GVariant *gvar;
 727         GVariantBuilder gvb;
 728
 729         (void)data;
 730
 731         /* Driver options, no device instance necessary. */
 732         switch (key) {
 733         case SR_CONF_SCAN_OPTIONS:
 734                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 735                                                   hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 736                 return SR_OK;
 737         default:
 738                 if (sdi == NULL)
 739                         return SR_ERR_ARG;
 740
 741                 devc = sdi->priv;
 742         }
 743
 744         /* Device options, independant from channel groups. */
 745         if (cg == NULL) {
 746                 switch (key) {
 747                 case SR_CONF_DEVICE_OPTIONS:
 748                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 749                                                           hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 750                         return SR_OK;
 751                 case SR_CONF_OUTPUT_CHANNEL:
 752                         if (devc->model->modelid <= LPS_303) {
 753                                 /* The 1-channel models. */
 754                                 *data = g_variant_new_strv(channel_modes, 1);
 755                         } else {
 756                                 /* The other models support all modes. */
 757                                 *data = g_variant_new_strv(channel_modes, ARRAY_SIZE(channel_modes));
 758                         }
 759                         return SR_OK;
 760                         break;
 761                 default:
 762                         return SR_ERR_NA;
 763                 }
 764         }
 765
 766         /* Device options, depending on channel groups. */
 767         ch = cg->channels->data;
 768         ch_idx = ch->index;
 769         switch (key) {
 770         case SR_CONF_DEVICE_OPTIONS:
 771                 if ((ch_idx == 0) || (ch_idx == 1)) /* CH1, CH2 */
 772                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 773                                   hwcaps_ch12, ARRAY_SIZE(hwcaps_ch12), sizeof(int32_t));
 774                 else /* Must be CH3 */
 775                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 776                                   hwcaps_ch3, ARRAY_SIZE(hwcaps_ch3), sizeof(int32_t));
 777                 break;
 778         case SR_CONF_OUTPUT_VOLTAGE_MAX:
 779                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 780                 /* Min, max, step. */
 781                 for (i = 0; i < 3; i++) {
 782                         gvar = g_variant_new_double(devc->model->channels[ch_idx].voltage[i]);
 783                         g_variant_builder_add_value(&gvb, gvar);
 784                 }
 785                 *data = g_variant_builder_end(&gvb);
 786                 break;
 787         case SR_CONF_OUTPUT_CURRENT_MAX:
 788                 g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 789                 /* Min, max, step. */
 790                 for (i = 0; i < 3; i++) {
 791                         gvar = g_variant_new_double(devc->model->channels[ch_idx].current[i]);
 792                         g_variant_builder_add_value(&gvb, gvar);
 793                 }
 794                 *data = g_variant_builder_end(&gvb);
 795                 break;
 796         default:
 797                 return SR_ERR_NA;
 798         }
 799
 800         return SR_OK;
 801 }
 802
 803 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 804                                     void *cb_data)
 805 {
 806         struct dev_context *devc;
 807         struct sr_serial_dev_inst *serial;
 808
 809         if (sdi->status != SR_ST_ACTIVE)
 810                 return SR_ERR_DEV_CLOSED;
 811
 812         devc = sdi->priv;
 813
 814         devc->acq_running = TRUE;
 815
 816         serial = sdi->conn;
 817         serial_source_add(sdi->session, serial, G_IO_IN, 50,
 818                         motech_lps_30x_receive_data, (void *)sdi);
 819         std_session_send_df_header(cb_data, LOG_PREFIX);
 820
 821         /* Start timer, if required. */
 822         if (devc->limit_msec)
 823                 g_timer_start(devc->elapsed_msec);
 824
 825         devc->acq_req = AQ_NONE;
 826         /* Do not start polling device here, the read function will do it in 50 ms. */
 827
 828         return SR_OK;
 829 }
 830
 831 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 832 {
 833         struct dev_context *devc;
 834
 835         /* Stop timer, if required. */
 836         if (sdi && (devc = sdi->priv) && devc->limit_msec)
 837                 g_timer_stop(devc->elapsed_msec);
 838
 839         return std_serial_dev_acquisition_stop(sdi, cb_data, std_serial_dev_close,
 840                         sdi->conn, LOG_PREFIX);
 841 }
 842
 843 SR_PRIV struct sr_dev_driver motech_lps_301_driver_info = {
 844         .name = "motech-lps-301",
 845         .longname = "Motech LPS-301",
 846         .api_version = 1,
 847         .init = init_lps301,
 848         .cleanup = cleanup,
 849         .scan = scan_lps301,
 850         .dev_list = dev_list_lps301,
 851         .dev_clear = dev_clear_lps301,
 852         .config_get = config_get,
 853         .config_set = config_set,
 854         .config_list = config_list,
 855         .dev_open = std_serial_dev_open,
 856         .dev_close = std_serial_dev_close,
 857         .dev_acquisition_start = dev_acquisition_start,
 858         .dev_acquisition_stop = dev_acquisition_stop,
 859         .priv = NULL,
 860 };