src/hardware/rdtech-dps/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2018 James Churchill <pelrun@gmail.com>
   5  * Copyright (C) 2019 Frank Stettner <frank-stettner@gmx.net>
   6  * Copyright (C) 2021 Gerhard Sittig <gerhard.sittig@gmx.net>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "config.h"
  23
  24 #include <math.h>
  25 #include <string.h>
  26
  27 #include "protocol.h"
  28
  29 /* These are the Modbus RTU registers for the family of rdtech-dps devices. */
  30 enum rdtech_dps_register {
  31         REG_DPS_USET       = 0x00, /* Mirror of 0x50 */
  32         REG_DPS_ISET       = 0x01, /* Mirror of 0x51 */
  33         REG_DPS_UOUT       = 0x02,
  34         REG_DPS_IOUT       = 0x03,
  35         REG_DPS_POWER      = 0x04,
  36         REG_DPS_UIN        = 0x05,
  37         REG_DPS_LOCK       = 0x06,
  38         REG_DPS_PROTECT    = 0x07,
  39         REG_DPS_CV_CC      = 0x08,
  40         REG_DPS_ENABLE     = 0x09,
  41         REG_DPS_BACKLIGHT  = 0x0A, /* Mirror of 0x55 */
  42         REG_DPS_MODEL      = 0x0B,
  43         REG_DPS_VERSION    = 0x0C,
  44
  45         REG_DPS_PRESET     = 0x23, /* Loads a preset into preset 0. */
  46
  47         /*
  48          * Add (preset * 0x10) to each of the following, for preset 1-9.
  49          * Preset 0 regs below are the active output settings.
  50          */
  51         PRE_DPS_USET       = 0x50,
  52         PRE_DPS_ISET       = 0x51,
  53         PRE_DPS_OVPSET     = 0x52,
  54         PRE_DPS_OCPSET     = 0x53,
  55         PRE_DPS_OPPSET     = 0x54,
  56         PRE_DPS_BACKLIGHT  = 0x55,
  57         PRE_DPS_DISABLE    = 0x56, /* Disable output if 0 is copied here from a preset (1 is no change). */
  58         PRE_DPS_BOOT       = 0x57, /* Enable output at boot if 1. */
  59 };
  60 #define PRE_DPS_STRIDE 0x10
  61
  62 enum rdtech_dps_protect_state {
  63         STATE_NORMAL = 0,
  64         STATE_OVP    = 1,
  65         STATE_OCP    = 2,
  66         STATE_OPP    = 3,
  67 };
  68
  69 enum rdtech_dps_regulation_mode {
  70         MODE_CV      = 0,
  71         MODE_CC      = 1,
  72 };
  73
  74 /*
  75  * Some registers are specific to a certain device. For example,
  76  * REG_RD_RANGE is specific to RD6012P.
  77  */
  78 enum rdtech_rd_register {
  79         REG_RD_MODEL = 0, /* u16 */
  80         REG_RD_SERIAL = 1, /* u32 */
  81         REG_RD_FIRMWARE = 3, /* u16 */
  82         REG_RD_TEMP_INT = 4, /* 2x u16 */
  83         REG_RD_TEMP_INT_F = 6, /* 2x u16 */
  84         REG_RD_VOLT_TGT = 8, /* u16 */
  85         REG_RD_CURR_LIM = 9, /* u16 */
  86         REG_RD_VOLTAGE = 10, /* u16 */
  87         REG_RD_CURRENT = 11, /* u16 */
  88         REG_RD_ENERGY = 12, /* u16 */
  89         REG_RD_POWER = 13, /* u16 */
  90         REG_RD_VOLT_IN = 14, /* u16 */
  91         REG_RD_PROTECT = 16, /* u16 */
  92         REG_RD_REGULATION = 17, /* u16 */
  93         REG_RD_ENABLE = 18, /* u16 */
  94         REG_RD_PRESET = 19, /* u16 */
  95         REG_RD_RANGE = 20, /* u16 */
  96         /*
  97          * Battery at 32 == 0x20 pp:
  98          * Mode, voltage, temperature, capacity, energy.
  99          */
 100         /*
 101          * Date/time at 48 == 0x30 pp:
 102          * Year, month, day, hour, minute, second.
 103          */
 104         /* Backlight at 72 == 0x48. */
 105         REG_RD_OVP_THR = 82, /* 0x52 */
 106         REG_RD_OCP_THR = 83, /* 0x53 */
 107         /* One "live" slot and 9 "memory" positions. */
 108         REG_RD_START_MEM = 84, /* 0x54 */
 109 };
 110
 111 /* Retries failed modbus read attempts for improved reliability. */
 112 static int rdtech_dps_read_holding_registers(struct sr_modbus_dev_inst *modbus,
 113         int address, int nb_registers, uint16_t *registers)
 114 {
 115         size_t retries;
 116         int ret;
 117
 118         retries = 3;
 119         do {
 120                 ret = sr_modbus_read_holding_registers(modbus,
 121                         address, nb_registers, registers);
 122                 if (ret == SR_OK)
 123                         return ret;
 124         } while (--retries);
 125
 126         return ret;
 127 }
 128
 129 /* Set one 16bit register. LE format for DPS devices. */
 130 static int rdtech_dps_set_reg(const struct sr_dev_inst *sdi,
 131         uint16_t address, uint16_t value)
 132 {
 133         struct dev_context *devc;
 134         struct sr_modbus_dev_inst *modbus;
 135         uint16_t registers[1];
 136         int ret;
 137         uint8_t *wrptr;
 138
 139         devc = sdi->priv;
 140         modbus = sdi->conn;
 141
 142         wrptr = (void *)registers;
 143         write_u16be(wrptr, value);
 144
 145         g_mutex_lock(&devc->rw_mutex);
 146         ret = sr_modbus_write_multiple_registers(modbus, address,
 147                 ARRAY_SIZE(registers), registers);
 148         g_mutex_unlock(&devc->rw_mutex);
 149
 150         return ret;
 151 }
 152
 153 /* Set one 16bit register. BE format for RD devices. */
 154 static int rdtech_rd_set_reg(const struct sr_dev_inst *sdi,
 155         uint16_t address, uint16_t value)
 156 {
 157         struct dev_context *devc;
 158         struct sr_modbus_dev_inst *modbus;
 159         uint16_t registers[1];
 160         int ret;
 161         uint8_t *wrptr;
 162
 163         devc = sdi->priv;
 164         modbus = sdi->conn;
 165
 166         wrptr = (void *)registers;
 167         write_u16be(wrptr, value);
 168
 169         g_mutex_lock(&devc->rw_mutex);
 170         ret = sr_modbus_write_multiple_registers(modbus, address,
 171                 ARRAY_SIZE(registers), registers);
 172         g_mutex_unlock(&devc->rw_mutex);
 173
 174         return ret;
 175 }
 176
 177 /* Get DPS model number and firmware version from a connected device. */
 178 SR_PRIV int rdtech_dps_get_model_version(struct sr_modbus_dev_inst *modbus,
 179         enum rdtech_dps_model_type model_type,
 180         uint16_t *model, uint16_t *version, uint32_t *serno)
 181 {
 182         uint16_t registers[4];
 183         int ret;
 184         const uint8_t *rdptr;
 185
 186         /*
 187          * No mutex here because when the routine executes then the
 188          * device instance was not created yet (probe phase).
 189          */
 190         switch (model_type) {
 191         case MODEL_DPS:
 192                 /* Get the MODEL and VERSION registers. */
 193                 ret = rdtech_dps_read_holding_registers(modbus,
 194                         REG_DPS_MODEL, 2, registers);
 195                 if (ret != SR_OK)
 196                         return ret;
 197                 rdptr = (void *)registers;
 198                 *model = read_u16be_inc(&rdptr);
 199                 *version = read_u16be_inc(&rdptr);
 200                 *serno = 0;
 201                 sr_info("RDTech DPS/DPH model: %u version: %u",
 202                         *model, *version);
 203                 return SR_OK;
 204         case MODEL_RD:
 205                 /* Get the MODEL, SERIAL, and FIRMWARE registers. */
 206                 ret = rdtech_dps_read_holding_registers(modbus,
 207                         REG_RD_MODEL, 4, registers);
 208                 if (ret != SR_OK)
 209                         return ret;
 210                 rdptr = (void *)registers;
 211                 *model = read_u16be_inc(&rdptr);
 212                 *serno = read_u32be_inc(&rdptr);
 213                 *version = read_u16be_inc(&rdptr);
 214                 sr_info("RDTech RD model: %u version: %u, serno %u",
 215                         *model, *version, *serno);
 216                 return SR_OK;
 217         default:
 218                 sr_err("Unexpected RDTech PSU device type. Programming error?");
 219                 return SR_ERR_ARG;
 220         }
 221         /* UNREACH */
 222 }
 223
 224 SR_PRIV void rdtech_dps_update_multipliers(const struct sr_dev_inst *sdi)
 225 {
 226         struct dev_context *devc;
 227         struct rdtech_dps_range *range;
 228
 229         devc = sdi->priv;
 230         range = &devc->model->ranges[devc->curr_range];
 231         devc->current_multiplier = pow(10.0, range->current_digits);
 232         devc->voltage_multiplier = pow(10.0, range->voltage_digits);
 233 }
 234
 235 /*
 236  * Determine range of connected device. Don't do anything once
 237  * acquisition has started (since the range will then be tracked).
 238  */
 239 SR_PRIV int rdtech_dps_update_range(const struct sr_dev_inst *sdi)
 240 {
 241         struct dev_context *devc;
 242         uint16_t range;
 243         int ret;
 244
 245         devc = sdi->priv;
 246
 247         /*
 248          * Only update range if there are multiple ranges and data
 249          * acquisition hasn't started.
 250          */
 251         if (devc->model->n_ranges == 1 || devc->acquisition_started)
 252                 return SR_OK;
 253         if (devc->model->model_type != MODEL_RD)
 254                 return SR_ERR;
 255
 256         ret = rdtech_dps_read_holding_registers(sdi->conn,
 257                 REG_RD_RANGE, 1, &range);
 258         if (ret != SR_OK)
 259                 return ret;
 260         devc->curr_range = range ? 1 : 0;
 261         rdtech_dps_update_multipliers(sdi);
 262
 263         return SR_OK;
 264 }
 265
 266 /* Send a measured value to the session feed. */
 267 static int send_value(const struct sr_dev_inst *sdi,
 268         struct sr_channel *ch, float value,
 269         enum sr_mq mq, enum sr_mqflag mqflags,
 270         enum sr_unit unit, int digits)
 271 {
 272         struct sr_datafeed_packet packet;
 273         struct sr_datafeed_analog analog;
 274         struct sr_analog_encoding encoding;
 275         struct sr_analog_meaning meaning;
 276         struct sr_analog_spec spec;
 277         int ret;
 278
 279         sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
 280         analog.meaning->channels = g_slist_append(NULL, ch);
 281         analog.num_samples = 1;
 282         analog.data = &value;
 283         analog.meaning->mq = mq;
 284         analog.meaning->mqflags = mqflags;
 285         analog.meaning->unit = unit;
 286
 287         packet.type = SR_DF_ANALOG;
 288         packet.payload = &analog;
 289         ret = sr_session_send(sdi, &packet);
 290
 291         g_slist_free(analog.meaning->channels);
 292
 293         return ret;
 294 }
 295
 296 /*
 297  * Get the device's current state. Exhaustively, relentlessly.
 298  * Concentrate all details of communication in the physical transport,
 299  * register layout interpretation, and potential model dependency in
 300  * this central spot, to simplify maintenance.
 301  *
 302  * TODO Optionally limit the transfer volume depending on caller's spec
 303  * which detail level is desired? Is 10 registers each 16bits an issue
 304  * when the UART bitrate is only 9600bps?
 305  */
 306 SR_PRIV int rdtech_dps_get_state(const struct sr_dev_inst *sdi,
 307         struct rdtech_dps_state *state, enum rdtech_dps_state_context reason)
 308 {
 309         struct dev_context *devc;
 310         struct sr_modbus_dev_inst *modbus;
 311         gboolean get_config, get_init_state, get_curr_meas;
 312         uint16_t registers[14];
 313         int ret;
 314         const uint8_t *rdptr;
 315         uint16_t uset_raw, iset_raw, uout_raw, iout_raw, power_raw;
 316         uint16_t reg_val, reg_state, out_state, ovpset_raw, ocpset_raw;
 317         gboolean is_lock, is_out_enabled, is_reg_cc;
 318         gboolean uses_ovp, uses_ocp;
 319         uint16_t range;
 320         float volt_target, curr_limit;
 321         float ovp_threshold, ocp_threshold;
 322         float curr_voltage, curr_current, curr_power;
 323
 324         if (!sdi || !sdi->priv || !sdi->conn)
 325                 return SR_ERR_ARG;
 326         devc = sdi->priv;
 327         modbus = sdi->conn;
 328         if (!state)
 329                 return SR_ERR_ARG;
 330
 331         /* Determine the requested level of response detail. */
 332         get_config = FALSE;
 333         get_init_state = FALSE;
 334         get_curr_meas = FALSE;
 335         switch (reason) {
 336         case ST_CTX_CONFIG:
 337                 get_config = TRUE;
 338                 get_init_state = TRUE;
 339                 get_curr_meas = TRUE;
 340                 break;
 341         case ST_CTX_PRE_ACQ:
 342                 get_init_state = TRUE;
 343                 get_curr_meas = TRUE;
 344                 break;
 345         case ST_CTX_IN_ACQ:
 346                 get_curr_meas = TRUE;
 347                 break;
 348         default:
 349                 /* EMPTY */
 350                 break;
 351         }
 352         /*
 353          * TODO Make use of this information to reduce the transfer
 354          * volume, especially on low bitrate serial connections. Though
 355          * the device firmware's samplerate is probably more limiting
 356          * than communication bandwidth is.
 357          */
 358         (void)get_config;
 359         (void)get_init_state;
 360         (void)get_curr_meas;
 361
 362         /*
 363          * The model RD6012P has two voltage/current ranges. We set a
 364          * default value here such that the compiler doesn't generate
 365          * an uninitialized variable warning.
 366          */
 367         range = 0;
 368
 369         switch (devc->model->model_type) {
 370         case MODEL_DPS:
 371                 /*
 372                  * Transfer a chunk of registers in a single call. It's
 373                  * unfortunate that the model dependency and the sparse
 374                  * register map force us to open code addresses, sizes,
 375                  * and the sequence of the registers and how to interpret
 376                  * their bit fields. But then this is not too unusual for
 377                  * a hardware specific device driver ...
 378                  */
 379                 g_mutex_lock(&devc->rw_mutex);
 380                 ret = rdtech_dps_read_holding_registers(modbus, REG_DPS_USET,
 381                         REG_DPS_ENABLE - REG_DPS_USET + 1, registers);
 382                 g_mutex_unlock(&devc->rw_mutex);
 383                 if (ret != SR_OK)
 384                         return ret;
 385
 386                 /* Interpret the registers' values. */
 387                 rdptr = (const void *)registers;
 388                 uset_raw = read_u16be_inc(&rdptr);
 389                 volt_target = uset_raw / devc->voltage_multiplier;
 390                 iset_raw = read_u16be_inc(&rdptr);
 391                 curr_limit = iset_raw / devc->current_multiplier;
 392                 uout_raw = read_u16be_inc(&rdptr);
 393                 curr_voltage = uout_raw / devc->voltage_multiplier;
 394                 iout_raw = read_u16be_inc(&rdptr);
 395                 curr_current = iout_raw / devc->current_multiplier;
 396                 power_raw = read_u16be_inc(&rdptr);
 397                 curr_power = power_raw / 100.0f;
 398                 (void)read_u16be_inc(&rdptr); /* UIN */
 399                 reg_val = read_u16be_inc(&rdptr); /* LOCK */
 400                 is_lock = reg_val != 0;
 401                 reg_val = read_u16be_inc(&rdptr); /* PROTECT */
 402                 uses_ovp = reg_val == STATE_OVP;
 403                 uses_ocp = reg_val == STATE_OCP;
 404                 reg_state = read_u16be_inc(&rdptr); /* CV_CC */
 405                 is_reg_cc = reg_state == MODE_CC;
 406                 out_state = read_u16be_inc(&rdptr); /* ENABLE */
 407                 is_out_enabled = out_state != 0;
 408
 409                 /* Transfer another chunk of registers in a single call. */
 410                 g_mutex_lock(&devc->rw_mutex);
 411                 ret = rdtech_dps_read_holding_registers(modbus,
 412                         PRE_DPS_OVPSET, 2, registers);
 413                 g_mutex_unlock(&devc->rw_mutex);
 414                 if (ret != SR_OK)
 415                         return ret;
 416
 417                 /* Interpret the second registers chunk's values. */
 418                 rdptr = (const void *)registers;
 419                 ovpset_raw = read_u16be_inc(&rdptr); /* PRE OVPSET */
 420                 ovp_threshold = ovpset_raw * devc->voltage_multiplier;
 421                 ocpset_raw = read_u16be_inc(&rdptr); /* PRE OCPSET */
 422                 ocp_threshold = ocpset_raw * devc->current_multiplier;
 423
 424                 break;
 425
 426         case MODEL_RD:
 427                 /* Retrieve a set of adjacent registers. */
 428                 g_mutex_lock(&devc->rw_mutex);
 429                 ret = rdtech_dps_read_holding_registers(modbus,
 430                         REG_RD_VOLT_TGT,
 431                         devc->model->n_ranges > 1
 432                                 ? REG_RD_RANGE - REG_RD_VOLT_TGT + 1
 433                                 : REG_RD_ENABLE - REG_RD_VOLT_TGT + 1,
 434                         registers);
 435                 g_mutex_unlock(&devc->rw_mutex);
 436                 if (ret != SR_OK)
 437                         return ret;
 438
 439                 /* Interpret the registers' raw content. */
 440                 rdptr = (const void *)registers;
 441                 uset_raw = read_u16be_inc(&rdptr); /* USET */
 442                 volt_target = uset_raw / devc->voltage_multiplier;
 443                 iset_raw = read_u16be_inc(&rdptr); /* ISET */
 444                 curr_limit = iset_raw / devc->current_multiplier;
 445                 uout_raw = read_u16be_inc(&rdptr); /* UOUT */
 446                 curr_voltage = uout_raw / devc->voltage_multiplier;
 447                 iout_raw = read_u16be_inc(&rdptr); /* IOUT */
 448                 curr_current = iout_raw / devc->current_multiplier;
 449                 (void)read_u16be_inc(&rdptr); /* ENERGY */
 450                 power_raw = read_u16be_inc(&rdptr); /* POWER */
 451                 curr_power = power_raw / 100.0f;
 452                 (void)read_u16be_inc(&rdptr); /* VOLT_IN */
 453                 (void)read_u16be_inc(&rdptr);
 454                 reg_val = read_u16be_inc(&rdptr); /* PROTECT */
 455                 uses_ovp = reg_val == STATE_OVP;
 456                 uses_ocp = reg_val == STATE_OCP;
 457                 reg_state = read_u16be_inc(&rdptr); /* REGULATION */
 458                 is_reg_cc = reg_state == MODE_CC;
 459                 out_state = read_u16be_inc(&rdptr); /* ENABLE */
 460                 is_out_enabled = out_state != 0;
 461                 if (devc->model->n_ranges > 1) {
 462                         rdptr += sizeof (uint16_t); /* PRESET */
 463                         range = read_u16be_inc(&rdptr) ? 1 : 0; /* RANGE */
 464                 }
 465
 466                 /* Retrieve a set of adjacent registers. */
 467                 g_mutex_lock(&devc->rw_mutex);
 468                 ret = rdtech_dps_read_holding_registers(modbus,
 469                         REG_RD_OVP_THR, 2, registers);
 470                 g_mutex_unlock(&devc->rw_mutex);
 471                 if (ret != SR_OK)
 472                         return ret;
 473
 474                 /* Interpret the registers' raw content. */
 475                 rdptr = (const void *)registers;
 476                 ovpset_raw = read_u16be_inc(&rdptr); /* OVP THR */
 477                 ovp_threshold = ovpset_raw / devc->voltage_multiplier;
 478                 ocpset_raw = read_u16be_inc(&rdptr); /* OCP THR */
 479                 ocp_threshold = ocpset_raw / devc->current_multiplier;
 480
 481                 /* Details which we cannot query from the device. */
 482                 is_lock = FALSE;
 483
 484                 break;
 485
 486         default:
 487                 /* ShouldNotHappen(TM). Probe should have failed. */
 488                 return SR_ERR_ARG;
 489         }
 490
 491         /*
 492          * Store gathered details in the high level container.
 493          *
 494          * TODO Make use of the caller's context. The register access
 495          * code path above need not have gathered every detail in every
 496          * invocation.
 497          */
 498         memset(state, 0, sizeof(*state));
 499         state->lock = is_lock;
 500         state->mask |= STATE_LOCK;
 501         state->output_enabled = is_out_enabled;
 502         state->mask |= STATE_OUTPUT_ENABLED;
 503         state->regulation_cc = is_reg_cc;
 504         state->mask |= STATE_REGULATION_CC;
 505         state->protect_ovp = uses_ovp;
 506         state->mask |= STATE_PROTECT_OVP;
 507         state->protect_ocp = uses_ocp;
 508         state->mask |= STATE_PROTECT_OCP;
 509         state->protect_enabled = TRUE;
 510         state->mask |= STATE_PROTECT_ENABLED;
 511         state->voltage_target = volt_target;
 512         state->mask |= STATE_VOLTAGE_TARGET;
 513         state->current_limit = curr_limit;
 514         state->mask |= STATE_CURRENT_LIMIT;
 515         state->ovp_threshold = ovp_threshold;
 516         state->mask |= STATE_OVP_THRESHOLD;
 517         state->ocp_threshold = ocp_threshold;
 518         state->mask |= STATE_OCP_THRESHOLD;
 519         state->voltage = curr_voltage;
 520         state->mask |= STATE_VOLTAGE;
 521         state->current = curr_current;
 522         state->mask |= STATE_CURRENT;
 523         state->power = curr_power;
 524         state->mask |= STATE_POWER;
 525         if (devc->model->n_ranges > 1) {
 526                 state->range = range;
 527                 state->mask |= STATE_RANGE;
 528         }
 529
 530         return SR_OK;
 531 }
 532
 533 /* Setup device's parameters. Selectively, from caller specs. */
 534 SR_PRIV int rdtech_dps_set_state(const struct sr_dev_inst *sdi,
 535         struct rdtech_dps_state *state)
 536 {
 537         struct dev_context *devc;
 538         uint16_t reg_value;
 539         int ret;
 540
 541         if (!sdi || !sdi->priv || !sdi->conn)
 542                 return SR_ERR_ARG;
 543         devc = sdi->priv;
 544         if (!state)
 545                 return SR_ERR_ARG;
 546
 547         /* Only a subset of known values is settable. */
 548         if (state->mask & STATE_OUTPUT_ENABLED) {
 549                 reg_value = state->output_enabled ? 1 : 0;
 550                 switch (devc->model->model_type) {
 551                 case MODEL_DPS:
 552                         ret = rdtech_dps_set_reg(sdi, REG_DPS_ENABLE, reg_value);
 553                         if (ret != SR_OK)
 554                                 return ret;
 555                         break;
 556                 case MODEL_RD:
 557                         ret = rdtech_rd_set_reg(sdi, REG_RD_ENABLE, reg_value);
 558                         if (ret != SR_OK)
 559                                 return ret;
 560                         break;
 561                 default:
 562                         return SR_ERR_ARG;
 563                 }
 564         }
 565         if (state->mask & STATE_VOLTAGE_TARGET) {
 566                 reg_value = state->voltage_target * devc->voltage_multiplier;
 567                 switch (devc->model->model_type) {
 568                 case MODEL_DPS:
 569                         ret = rdtech_dps_set_reg(sdi, REG_DPS_USET, reg_value);
 570                         if (ret != SR_OK)
 571                                 return ret;
 572                         break;
 573                 case MODEL_RD:
 574                         ret = rdtech_rd_set_reg(sdi, REG_RD_VOLT_TGT, reg_value);
 575                         if (ret != SR_OK)
 576                                 return ret;
 577                         break;
 578                 default:
 579                         return SR_ERR_ARG;
 580                 }
 581         }
 582         if (state->mask & STATE_CURRENT_LIMIT) {
 583                 reg_value = state->current_limit * devc->current_multiplier;
 584                 switch (devc->model->model_type) {
 585                 case MODEL_DPS:
 586                         ret = rdtech_dps_set_reg(sdi, REG_DPS_ISET, reg_value);
 587                         if (ret != SR_OK)
 588                                 return ret;
 589                         break;
 590                 case MODEL_RD:
 591                         ret = rdtech_rd_set_reg(sdi, REG_RD_CURR_LIM, reg_value);
 592                         if (ret != SR_OK)
 593                                 return ret;
 594                         break;
 595                 default:
 596                         return SR_ERR_ARG;
 597                 }
 598         }
 599         if (state->mask & STATE_OVP_THRESHOLD) {
 600                 reg_value = state->ovp_threshold * devc->voltage_multiplier;
 601                 switch (devc->model->model_type) {
 602                 case MODEL_DPS:
 603                         ret = rdtech_dps_set_reg(sdi, PRE_DPS_OVPSET, reg_value);
 604                         if (ret != SR_OK)
 605                                 return ret;
 606                         break;
 607                 case MODEL_RD:
 608                         ret = rdtech_rd_set_reg(sdi, REG_RD_OVP_THR, reg_value);
 609                         if (ret != SR_OK)
 610                                 return ret;
 611                         break;
 612                 default:
 613                         return SR_ERR_ARG;
 614                 }
 615         }
 616         if (state->mask & STATE_OCP_THRESHOLD) {
 617                 reg_value = state->ocp_threshold * devc->current_multiplier;
 618                 switch (devc->model->model_type) {
 619                 case MODEL_DPS:
 620                         ret = rdtech_dps_set_reg(sdi, PRE_DPS_OCPSET, reg_value);
 621                         if (ret != SR_OK)
 622                                 return ret;
 623                         break;
 624                 case MODEL_RD:
 625                         ret = rdtech_rd_set_reg(sdi, REG_RD_OCP_THR, reg_value);
 626                         if (ret != SR_OK)
 627                                 return ret;
 628                         break;
 629                 default:
 630                         return SR_ERR_ARG;
 631                 }
 632         }
 633         if (state->mask & STATE_LOCK) {
 634                 switch (devc->model->model_type) {
 635                 case MODEL_DPS:
 636                         reg_value = state->lock ? 1 : 0;
 637                         ret = rdtech_dps_set_reg(sdi, REG_DPS_LOCK, reg_value);
 638                         if (ret != SR_OK)
 639                                 return ret;
 640                         break;
 641                 case MODEL_RD:
 642                         /* Do nothing, _and_ silently succeed. */
 643                         break;
 644                 default:
 645                         return SR_ERR_ARG;
 646                 }
 647         }
 648         if (state->mask & STATE_RANGE) {
 649                 reg_value = state->range;
 650                 switch (devc->model->model_type) {
 651                 case MODEL_DPS:
 652                         if (reg_value > 0)
 653                                 return SR_ERR_ARG;
 654                         break;
 655                 case MODEL_RD:
 656                         if (devc->model->n_ranges == 1)
 657                                 /* No need to set. */
 658                                 return SR_OK;
 659                         ret = rdtech_rd_set_reg(sdi, REG_RD_RANGE, reg_value);
 660                         if (ret != SR_OK)
 661                                 return ret;
 662                         if (!devc->acquisition_started) {
 663                                 devc->curr_range = reg_value ? 1 : 0;
 664                                 rdtech_dps_update_multipliers(sdi);
 665                         }
 666                         /*
 667                          * We rely on the data acquisition to update
 668                          * devc->curr_range. If we do it here, there
 669                          * will be no range meta package.
 670                          */
 671                         break;
 672                 default:
 673                         return SR_ERR_ARG;
 674                 }
 675         }
 676
 677         return SR_OK;
 678 }
 679
 680 /* Get the current state when acquisition starts. */
 681 SR_PRIV int rdtech_dps_seed_receive(const struct sr_dev_inst *sdi)
 682 {
 683         struct dev_context *devc;
 684         struct rdtech_dps_state state;
 685         int ret;
 686
 687         if (!sdi || !sdi->priv)
 688                 return SR_ERR_ARG;
 689         devc = sdi->priv;
 690         devc->acquisition_started = TRUE;
 691
 692         ret = rdtech_dps_get_state(sdi, &state, ST_CTX_PRE_ACQ);
 693         if (ret != SR_OK)
 694                 return ret;
 695
 696         if (state.mask & STATE_PROTECT_OVP)
 697                 devc->curr_ovp_state = state.protect_ovp;
 698         if (state.mask & STATE_PROTECT_OCP)
 699                 devc->curr_ocp_state = state.protect_ocp;
 700         if (state.mask & STATE_REGULATION_CC)
 701                 devc->curr_cc_state = state.regulation_cc;
 702         if (state.mask & STATE_OUTPUT_ENABLED)
 703                 devc->curr_out_state = state.output_enabled;
 704         if (state.mask & STATE_RANGE) {
 705                 devc->curr_range = state.range;
 706                 rdtech_dps_update_multipliers(sdi);
 707         }
 708
 709         return SR_OK;
 710 }
 711
 712 /* Get measurements, track state changes during acquisition. */
 713 SR_PRIV int rdtech_dps_receive_data(int fd, int revents, void *cb_data)
 714 {
 715         struct sr_dev_inst *sdi;
 716         struct dev_context *devc;
 717         struct rdtech_dps_state state;
 718         int ret;
 719         struct sr_channel *ch;
 720         const char *regulation_text;
 721
 722         (void)fd;
 723         (void)revents;
 724
 725         sdi = cb_data;
 726         if (!sdi)
 727                 return TRUE;
 728         devc = sdi->priv;
 729
 730         /* Get the device's current state. */
 731         ret = rdtech_dps_get_state(sdi, &state, ST_CTX_IN_ACQ);
 732         if (ret != SR_OK)
 733                 return ret;
 734
 735
 736         /* Submit measurement data to the session feed. */
 737         std_session_send_df_frame_begin(sdi);
 738         ch = g_slist_nth_data(sdi->channels, 0);
 739         send_value(sdi, ch, state.voltage,
 740                 SR_MQ_VOLTAGE, SR_MQFLAG_DC, SR_UNIT_VOLT,
 741                 devc->model->ranges[devc->curr_range].voltage_digits);
 742         ch = g_slist_nth_data(sdi->channels, 1);
 743         send_value(sdi, ch, state.current,
 744                 SR_MQ_CURRENT, SR_MQFLAG_DC, SR_UNIT_AMPERE,
 745                 devc->model->ranges[devc->curr_range].current_digits);
 746         ch = g_slist_nth_data(sdi->channels, 2);
 747         send_value(sdi, ch, state.power,
 748                 SR_MQ_POWER, 0, SR_UNIT_WATT, 2);
 749         std_session_send_df_frame_end(sdi);
 750
 751         /* Check for state changes. */
 752         if (devc->curr_ovp_state != state.protect_ovp) {
 753                 (void)sr_session_send_meta(sdi,
 754                         SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE,
 755                         g_variant_new_boolean(state.protect_ovp));
 756                 devc->curr_ovp_state = state.protect_ovp;
 757         }
 758         if (devc->curr_ocp_state != state.protect_ocp) {
 759                 (void)sr_session_send_meta(sdi,
 760                         SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE,
 761                         g_variant_new_boolean(state.protect_ocp));
 762                 devc->curr_ocp_state = state.protect_ocp;
 763         }
 764         if (devc->curr_cc_state != state.regulation_cc) {
 765                 regulation_text = state.regulation_cc ? "CC" : "CV";
 766                 (void)sr_session_send_meta(sdi, SR_CONF_REGULATION,
 767                         g_variant_new_string(regulation_text));
 768                 devc->curr_cc_state = state.regulation_cc;
 769         }
 770         if (devc->curr_out_state != state.output_enabled) {
 771                 (void)sr_session_send_meta(sdi, SR_CONF_ENABLED,
 772                         g_variant_new_boolean(state.output_enabled));
 773                 devc->curr_out_state = state.output_enabled;
 774         }
 775         if (devc->curr_range != state.range) {
 776                 (void)sr_session_send_meta(sdi, SR_CONF_RANGE,
 777                         g_variant_new_string(
 778                                 devc->model->ranges[state.range].range_str));
 779                 devc->curr_range = state.range;
 780                 rdtech_dps_update_multipliers(sdi);
 781         }
 782
 783         /* Check optional acquisition limits. */
 784         sr_sw_limits_update_samples_read(&devc->limits, 1);
 785         if (sr_sw_limits_check(&devc->limits)) {
 786                 sr_dev_acquisition_stop(sdi);
 787                 return TRUE;
 788         }
 789
 790         return TRUE;
 791 }