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 DPS family of 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  * These are the Modbus RTU registers for the RD family of devices.
  76  * Some registers are device specific, like REG_RD_RANGE of RD6012P
  77  * which could be battery related in other devices.
  78  */
  79 enum rdtech_rd_register {
  80         REG_RD_MODEL = 0, /* u16 */
  81         REG_RD_SERIAL = 1, /* u32 */
  82         REG_RD_FIRMWARE = 3, /* u16 */
  83         REG_RD_TEMP_INT = 4, /* 2x u16 */
  84         REG_RD_TEMP_INT_F = 6, /* 2x u16 */
  85         REG_RD_VOLT_TGT = 8, /* u16 */
  86         REG_RD_CURR_LIM = 9, /* u16 */
  87         REG_RD_VOLTAGE = 10, /* u16 */
  88         REG_RD_CURRENT = 11, /* u16 */
  89         REG_RD_ENERGY = 12, /* u16 */
  90         REG_RD_POWER = 13, /* u16 */
  91         REG_RD_VOLT_IN = 14, /* u16 */
  92         REG_RD_PROTECT = 16, /* u16 */
  93         REG_RD_REGULATION = 17, /* u16 */
  94         REG_RD_ENABLE = 18, /* u16 */
  95         REG_RD_PRESET = 19, /* u16 */
  96         REG_RD_RANGE = 20, /* u16 */
  97         /*
  98          * Battery at 32 == 0x20 pp:
  99          * Mode, voltage, temperature, capacity, energy.
 100          */
 101         /*
 102          * Date/time at 48 == 0x30 pp:
 103          * Year, month, day, hour, minute, second.
 104          */
 105         /* Backlight at 72 == 0x48. */
 106         REG_RD_OVP_THR = 82, /* 0x52 */
 107         REG_RD_OCP_THR = 83, /* 0x53 */
 108         /* One "live" slot and 9 "memory" positions. */
 109         REG_RD_START_MEM = 84, /* 0x54 */
 110 };
 111
 112 /* Retries failed modbus read attempts for improved reliability. */
 113 static int rdtech_dps_read_holding_registers(struct sr_modbus_dev_inst *modbus,
 114         int address, int nb_registers, uint16_t *registers)
 115 {
 116         size_t retries;
 117         int ret;
 118
 119         retries = 3;
 120         while (retries--) {
 121                 ret = sr_modbus_read_holding_registers(modbus,
 122                         address, nb_registers, registers);
 123                 if (ret == SR_OK)
 124                         return ret;
 125         }
 126
 127         return ret;
 128 }
 129
 130 /* Set one 16bit register. LE format for DPS devices. */
 131 static int rdtech_dps_set_reg(const struct sr_dev_inst *sdi,
 132         uint16_t address, uint16_t value)
 133 {
 134         struct dev_context *devc;
 135         struct sr_modbus_dev_inst *modbus;
 136         uint16_t registers[1];
 137         int ret;
 138         uint8_t *wrptr;
 139
 140         devc = sdi->priv;
 141         modbus = sdi->conn;
 142
 143         wrptr = (void *)registers;
 144         write_u16be(wrptr, value);
 145
 146         g_mutex_lock(&devc->rw_mutex);
 147         ret = sr_modbus_write_multiple_registers(modbus, address,
 148                 ARRAY_SIZE(registers), registers);
 149         g_mutex_unlock(&devc->rw_mutex);
 150
 151         return ret;
 152 }
 153
 154 /* Set one 16bit register. BE format for RD devices. */
 155 static int rdtech_rd_set_reg(const struct sr_dev_inst *sdi,
 156         uint16_t address, uint16_t value)
 157 {
 158         struct dev_context *devc;
 159         struct sr_modbus_dev_inst *modbus;
 160         uint16_t registers[1];
 161         int ret;
 162         uint8_t *wrptr;
 163
 164         devc = sdi->priv;
 165         modbus = sdi->conn;
 166
 167         wrptr = (void *)registers;
 168         write_u16be(wrptr, value);
 169
 170         g_mutex_lock(&devc->rw_mutex);
 171         ret = sr_modbus_write_multiple_registers(modbus, address,
 172                 ARRAY_SIZE(registers), registers);
 173         g_mutex_unlock(&devc->rw_mutex);
 174
 175         return ret;
 176 }
 177
 178 /* Get DPS model number and firmware version from a connected device. */
 179 SR_PRIV int rdtech_dps_get_model_version(struct sr_modbus_dev_inst *modbus,
 180         enum rdtech_dps_model_type model_type,
 181         uint16_t *model, uint16_t *version, uint32_t *serno)
 182 {
 183         uint16_t registers[4];
 184         int ret;
 185         const uint8_t *rdptr;
 186
 187         /*
 188          * No mutex here because when the routine executes then the
 189          * device instance was not created yet (probe phase).
 190          */
 191         switch (model_type) {
 192         case MODEL_DPS:
 193                 /* Get the MODEL and VERSION registers. */
 194                 ret = rdtech_dps_read_holding_registers(modbus,
 195                         REG_DPS_MODEL, 2, registers);
 196                 if (ret != SR_OK)
 197                         return ret;
 198                 rdptr = (void *)registers;
 199                 *model = read_u16be_inc(&rdptr);
 200                 *version = read_u16be_inc(&rdptr);
 201                 *serno = 0;
 202                 sr_info("RDTech DPS/DPH model: %u version: %u",
 203                         *model, *version);
 204                 return SR_OK;
 205         case MODEL_RD:
 206                 /* Get the MODEL, SERIAL, and FIRMWARE registers. */
 207                 ret = rdtech_dps_read_holding_registers(modbus,
 208                         REG_RD_MODEL, 4, registers);
 209                 if (ret != SR_OK)
 210                         return ret;
 211                 rdptr = (void *)registers;
 212                 *model = read_u16be_inc(&rdptr);
 213                 *serno = read_u32be_inc(&rdptr);
 214                 *version = read_u16be_inc(&rdptr);
 215                 sr_info("RDTech RD model: %u version: %u, serno %u",
 216                         *model, *version, *serno);
 217                 return SR_OK;
 218         default:
 219                 sr_err("Unexpected RDTech PSU device type. Programming error?");
 220                 return SR_ERR_ARG;
 221         }
 222         /* UNREACH */
 223 }
 224
 225 SR_PRIV void rdtech_dps_update_multipliers(const struct sr_dev_inst *sdi)
 226 {
 227         struct dev_context *devc;
 228         const struct rdtech_dps_range *range;
 229
 230         devc = sdi->priv;
 231         range = &devc->model->ranges[devc->curr_range];
 232         devc->current_multiplier = pow(10.0, range->current_digits);
 233         devc->voltage_multiplier = pow(10.0, range->voltage_digits);
 234 }
 235
 236 /*
 237  * Determine range of connected device. Don't do anything once
 238  * acquisition has started (since the range will then be tracked).
 239  */
 240 SR_PRIV int rdtech_dps_update_range(const struct sr_dev_inst *sdi)
 241 {
 242         struct dev_context *devc;
 243         uint16_t range;
 244         int ret;
 245
 246         devc = sdi->priv;
 247
 248         /*
 249          * Only update range if there are multiple ranges and data
 250          * acquisition hasn't started.
 251          */
 252         if (devc->model->n_ranges == 1 || devc->acquisition_started)
 253                 return SR_OK;
 254         if (devc->model->model_type != MODEL_RD)
 255                 return SR_ERR;
 256
 257         ret = rdtech_dps_read_holding_registers(sdi->conn,
 258                 REG_RD_RANGE, 1, &range);
 259         if (ret != SR_OK)
 260                 return ret;
 261         devc->curr_range = range ? 1 : 0;
 262         rdtech_dps_update_multipliers(sdi);
 263
 264         return SR_OK;
 265 }
 266
 267 /* Send a measured value to the session feed. */
 268 static int send_value(const struct sr_dev_inst *sdi,
 269         struct sr_channel *ch, float value,
 270         enum sr_mq mq, enum sr_mqflag mqflags,
 271         enum sr_unit unit, int digits)
 272 {
 273         struct sr_datafeed_packet packet;
 274         struct sr_datafeed_analog analog;
 275         struct sr_analog_encoding encoding;
 276         struct sr_analog_meaning meaning;
 277         struct sr_analog_spec spec;
 278         int ret;
 279
 280         sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
 281         analog.meaning->channels = g_slist_append(NULL, ch);
 282         analog.num_samples = 1;
 283         analog.data = &value;
 284         analog.meaning->mq = mq;
 285         analog.meaning->mqflags = mqflags;
 286         analog.meaning->unit = unit;
 287
 288         packet.type = SR_DF_ANALOG;
 289         packet.payload = &analog;
 290         ret = sr_session_send(sdi, &packet);
 291
 292         g_slist_free(analog.meaning->channels);
 293
 294         return ret;
 295 }
 296
 297 /*
 298  * Get the device's current state. Exhaustively, relentlessly.
 299  * Concentrate all details of communication in the physical transport,
 300  * register layout interpretation, and potential model dependency in
 301  * this central spot, to simplify maintenance.
 302  *
 303  * TODO Optionally limit the transfer volume depending on caller's spec
 304  * which detail level is desired? Is 10 registers each 16bits an issue
 305  * when the UART bitrate is only 9600bps?
 306  */
 307 SR_PRIV int rdtech_dps_get_state(const struct sr_dev_inst *sdi,
 308         struct rdtech_dps_state *state, enum rdtech_dps_state_context reason)
 309 {
 310         struct dev_context *devc;
 311         struct sr_modbus_dev_inst *modbus;
 312         gboolean get_config, get_init_state, get_curr_meas;
 313         uint16_t registers[14];
 314         int ret;
 315         const uint8_t *rdptr;
 316         uint16_t uset_raw, iset_raw, uout_raw, iout_raw, power_raw;
 317         uint16_t reg_val, reg_state, out_state, ovpset_raw, ocpset_raw;
 318         gboolean is_lock, is_out_enabled, is_reg_cc;
 319         gboolean uses_ovp, uses_ocp;
 320         uint16_t range;
 321         float volt_target, curr_limit;
 322         float ovp_threshold, ocp_threshold;
 323         float curr_voltage, curr_current, curr_power;
 324
 325         if (!sdi || !sdi->priv || !sdi->conn)
 326                 return SR_ERR_ARG;
 327         devc = sdi->priv;
 328         modbus = sdi->conn;
 329         if (!state)
 330                 return SR_ERR_ARG;
 331
 332         /* Determine the requested level of response detail. */
 333         get_config = FALSE;
 334         get_init_state = FALSE;
 335         get_curr_meas = FALSE;
 336         switch (reason) {
 337         case ST_CTX_CONFIG:
 338                 get_config = TRUE;
 339                 get_init_state = TRUE;
 340                 get_curr_meas = TRUE;
 341                 break;
 342         case ST_CTX_PRE_ACQ:
 343                 get_init_state = TRUE;
 344                 get_curr_meas = TRUE;
 345                 break;
 346         case ST_CTX_IN_ACQ:
 347                 get_curr_meas = TRUE;
 348                 break;
 349         default:
 350                 /* EMPTY */
 351                 break;
 352         }
 353         /*
 354          * TODO Make use of this information to reduce the transfer
 355          * volume, especially on low bitrate serial connections. Though
 356          * the device firmware's samplerate is probably more limiting
 357          * than communication bandwidth is.
 358          */
 359         (void)get_config;
 360         (void)get_init_state;
 361         (void)get_curr_meas;
 362
 363         /*
 364          * The model RD6012P has two voltage/current ranges. We set a
 365          * default value here such that the compiler doesn't generate
 366          * an uninitialized variable warning.
 367          */
 368         range = 0;
 369
 370         switch (devc->model->model_type) {
 371         case MODEL_DPS:
 372                 /*
 373                  * Transfer a chunk of registers in a single call. It's
 374                  * unfortunate that the model dependency and the sparse
 375                  * register map force us to open code addresses, sizes,
 376                  * and the sequence of the registers and how to interpret
 377                  * their bit fields. But then this is not too unusual for
 378                  * a hardware specific device driver ...
 379                  */
 380                 g_mutex_lock(&devc->rw_mutex);
 381                 ret = rdtech_dps_read_holding_registers(modbus,
 382                         REG_DPS_USET, REG_DPS_ENABLE - REG_DPS_USET + 1,
 383                         registers);
 384                 g_mutex_unlock(&devc->rw_mutex);
 385                 if (ret != SR_OK)
 386                         return ret;
 387
 388                 /* Interpret the registers' values. */
 389                 rdptr = (const void *)registers;
 390                 uset_raw = read_u16be_inc(&rdptr);
 391                 volt_target = uset_raw / devc->voltage_multiplier;
 392                 iset_raw = read_u16be_inc(&rdptr);
 393                 curr_limit = iset_raw / devc->current_multiplier;
 394                 uout_raw = read_u16be_inc(&rdptr);
 395                 curr_voltage = uout_raw / devc->voltage_multiplier;
 396                 iout_raw = read_u16be_inc(&rdptr);
 397                 curr_current = iout_raw / devc->current_multiplier;
 398                 power_raw = read_u16be_inc(&rdptr);
 399                 curr_power = power_raw / 100.0f;
 400                 (void)read_u16be_inc(&rdptr); /* UIN */
 401                 reg_val = read_u16be_inc(&rdptr); /* LOCK */
 402                 is_lock = reg_val != 0;
 403                 reg_val = read_u16be_inc(&rdptr); /* PROTECT */
 404                 uses_ovp = reg_val == STATE_OVP;
 405                 uses_ocp = reg_val == STATE_OCP;
 406                 reg_state = read_u16be_inc(&rdptr); /* CV_CC */
 407                 is_reg_cc = reg_state == MODE_CC;
 408                 out_state = read_u16be_inc(&rdptr); /* ENABLE */
 409                 is_out_enabled = out_state != 0;
 410
 411                 /* Transfer another chunk of registers in a single call. */
 412                 g_mutex_lock(&devc->rw_mutex);
 413                 ret = rdtech_dps_read_holding_registers(modbus,
 414                         PRE_DPS_OVPSET, 2, registers);
 415                 g_mutex_unlock(&devc->rw_mutex);
 416                 if (ret != SR_OK)
 417                         return ret;
 418
 419                 /* Interpret the second registers chunk's values. */
 420                 rdptr = (const void *)registers;
 421                 ovpset_raw = read_u16be_inc(&rdptr); /* PRE OVPSET */
 422                 ovp_threshold = ovpset_raw * devc->voltage_multiplier;
 423                 ocpset_raw = read_u16be_inc(&rdptr); /* PRE OCPSET */
 424                 ocp_threshold = ocpset_raw * devc->current_multiplier;
 425
 426                 break;
 427
 428         case MODEL_RD:
 429                 /* Retrieve a set of adjacent registers. */
 430                 g_mutex_lock(&devc->rw_mutex);
 431                 ret = rdtech_dps_read_holding_registers(modbus,
 432                         REG_RD_VOLT_TGT,
 433                         devc->model->n_ranges > 1
 434                                 ? REG_RD_RANGE - REG_RD_VOLT_TGT + 1
 435                                 : REG_RD_ENABLE - REG_RD_VOLT_TGT + 1,
 436                         registers);
 437                 g_mutex_unlock(&devc->rw_mutex);
 438                 if (ret != SR_OK)
 439                         return ret;
 440
 441                 /* Interpret the registers' raw content. */
 442                 rdptr = (const void *)registers;
 443                 uset_raw = read_u16be_inc(&rdptr); /* USET */
 444                 volt_target = uset_raw / devc->voltage_multiplier;
 445                 iset_raw = read_u16be_inc(&rdptr); /* ISET */
 446                 curr_limit = iset_raw / devc->current_multiplier;
 447                 uout_raw = read_u16be_inc(&rdptr); /* UOUT */
 448                 curr_voltage = uout_raw / devc->voltage_multiplier;
 449                 iout_raw = read_u16be_inc(&rdptr); /* IOUT */
 450                 curr_current = iout_raw / devc->current_multiplier;
 451                 (void)read_u16be_inc(&rdptr); /* ENERGY */
 452                 power_raw = read_u16be_inc(&rdptr); /* POWER */
 453                 curr_power = power_raw / 100.0f;
 454                 (void)read_u16be_inc(&rdptr); /* VOLT_IN */
 455                 (void)read_u16be_inc(&rdptr);
 456                 reg_val = read_u16be_inc(&rdptr); /* PROTECT */
 457                 uses_ovp = reg_val == STATE_OVP;
 458                 uses_ocp = reg_val == STATE_OCP;
 459                 reg_state = read_u16be_inc(&rdptr); /* REGULATION */
 460                 is_reg_cc = reg_state == MODE_CC;
 461                 out_state = read_u16be_inc(&rdptr); /* ENABLE */
 462                 is_out_enabled = out_state != 0;
 463                 if (devc->model->n_ranges > 1) {
 464                         (void)read_u16be_inc(&rdptr); /* PRESET */
 465                         range = read_u16be_inc(&rdptr) ? 1 : 0; /* RANGE */
 466                 }
 467
 468                 /* Retrieve a set of adjacent registers. */
 469                 g_mutex_lock(&devc->rw_mutex);
 470                 ret = rdtech_dps_read_holding_registers(modbus,
 471                         REG_RD_OVP_THR, 2, registers);
 472                 g_mutex_unlock(&devc->rw_mutex);
 473                 if (ret != SR_OK)
 474                         return ret;
 475
 476                 /* Interpret the registers' raw content. */
 477                 rdptr = (const void *)registers;
 478                 ovpset_raw = read_u16be_inc(&rdptr); /* OVP THR */
 479                 ovp_threshold = ovpset_raw / devc->voltage_multiplier;
 480                 ocpset_raw = read_u16be_inc(&rdptr); /* OCP THR */
 481                 ocp_threshold = ocpset_raw / devc->current_multiplier;
 482
 483                 /* Details which we cannot query from the device. */
 484                 is_lock = FALSE;
 485
 486                 break;
 487
 488         default:
 489                 /* ShouldNotHappen(TM). Probe should have failed. */
 490                 return SR_ERR_ARG;
 491         }
 492
 493         /*
 494          * Store gathered details in the high level container.
 495          *
 496          * TODO Make use of the caller's context. The register access
 497          * code path above need not have gathered every detail in every
 498          * invocation.
 499          */
 500         memset(state, 0, sizeof(*state));
 501         state->lock = is_lock;
 502         state->mask |= STATE_LOCK;
 503         state->output_enabled = is_out_enabled;
 504         state->mask |= STATE_OUTPUT_ENABLED;
 505         state->regulation_cc = is_reg_cc;
 506         state->mask |= STATE_REGULATION_CC;
 507         state->protect_ovp = uses_ovp;
 508         state->mask |= STATE_PROTECT_OVP;
 509         state->protect_ocp = uses_ocp;
 510         state->mask |= STATE_PROTECT_OCP;
 511         state->protect_enabled = TRUE;
 512         state->mask |= STATE_PROTECT_ENABLED;
 513         state->voltage_target = volt_target;
 514         state->mask |= STATE_VOLTAGE_TARGET;
 515         state->current_limit = curr_limit;
 516         state->mask |= STATE_CURRENT_LIMIT;
 517         state->ovp_threshold = ovp_threshold;
 518         state->mask |= STATE_OVP_THRESHOLD;
 519         state->ocp_threshold = ocp_threshold;
 520         state->mask |= STATE_OCP_THRESHOLD;
 521         state->voltage = curr_voltage;
 522         state->mask |= STATE_VOLTAGE;
 523         state->current = curr_current;
 524         state->mask |= STATE_CURRENT;
 525         state->power = curr_power;
 526         state->mask |= STATE_POWER;
 527         if (devc->model->n_ranges > 1) {
 528                 state->range = range;
 529                 state->mask |= STATE_RANGE;
 530         }
 531
 532         return SR_OK;
 533 }
 534
 535 /* Setup device's parameters. Selectively, from caller specs. */
 536 SR_PRIV int rdtech_dps_set_state(const struct sr_dev_inst *sdi,
 537         struct rdtech_dps_state *state)
 538 {
 539         struct dev_context *devc;
 540         uint16_t reg_value;
 541         int ret;
 542
 543         if (!sdi || !sdi->priv || !sdi->conn)
 544                 return SR_ERR_ARG;
 545         devc = sdi->priv;
 546         if (!state)
 547                 return SR_ERR_ARG;
 548
 549         /* Only a subset of known values is settable. */
 550         if (state->mask & STATE_OUTPUT_ENABLED) {
 551                 reg_value = state->output_enabled ? 1 : 0;
 552                 switch (devc->model->model_type) {
 553                 case MODEL_DPS:
 554                         ret = rdtech_dps_set_reg(sdi, REG_DPS_ENABLE, reg_value);
 555                         if (ret != SR_OK)
 556                                 return ret;
 557                         break;
 558                 case MODEL_RD:
 559                         ret = rdtech_rd_set_reg(sdi, REG_RD_ENABLE, reg_value);
 560                         if (ret != SR_OK)
 561                                 return ret;
 562                         break;
 563                 default:
 564                         return SR_ERR_ARG;
 565                 }
 566         }
 567         if (state->mask & STATE_VOLTAGE_TARGET) {
 568                 reg_value = state->voltage_target * devc->voltage_multiplier;
 569                 switch (devc->model->model_type) {
 570                 case MODEL_DPS:
 571                         ret = rdtech_dps_set_reg(sdi, REG_DPS_USET, reg_value);
 572                         if (ret != SR_OK)
 573                                 return ret;
 574                         break;
 575                 case MODEL_RD:
 576                         ret = rdtech_rd_set_reg(sdi, REG_RD_VOLT_TGT, reg_value);
 577                         if (ret != SR_OK)
 578                                 return ret;
 579                         break;
 580                 default:
 581                         return SR_ERR_ARG;
 582                 }
 583         }
 584         if (state->mask & STATE_CURRENT_LIMIT) {
 585                 reg_value = state->current_limit * devc->current_multiplier;
 586                 switch (devc->model->model_type) {
 587                 case MODEL_DPS:
 588                         ret = rdtech_dps_set_reg(sdi, REG_DPS_ISET, reg_value);
 589                         if (ret != SR_OK)
 590                                 return ret;
 591                         break;
 592                 case MODEL_RD:
 593                         ret = rdtech_rd_set_reg(sdi, REG_RD_CURR_LIM, reg_value);
 594                         if (ret != SR_OK)
 595                                 return ret;
 596                         break;
 597                 default:
 598                         return SR_ERR_ARG;
 599                 }
 600         }
 601         if (state->mask & STATE_OVP_THRESHOLD) {
 602                 reg_value = state->ovp_threshold * devc->voltage_multiplier;
 603                 switch (devc->model->model_type) {
 604                 case MODEL_DPS:
 605                         ret = rdtech_dps_set_reg(sdi, PRE_DPS_OVPSET, reg_value);
 606                         if (ret != SR_OK)
 607                                 return ret;
 608                         break;
 609                 case MODEL_RD:
 610                         ret = rdtech_rd_set_reg(sdi, REG_RD_OVP_THR, reg_value);
 611                         if (ret != SR_OK)
 612                                 return ret;
 613                         break;
 614                 default:
 615                         return SR_ERR_ARG;
 616                 }
 617         }
 618         if (state->mask & STATE_OCP_THRESHOLD) {
 619                 reg_value = state->ocp_threshold * devc->current_multiplier;
 620                 switch (devc->model->model_type) {
 621                 case MODEL_DPS:
 622                         ret = rdtech_dps_set_reg(sdi, PRE_DPS_OCPSET, reg_value);
 623                         if (ret != SR_OK)
 624                                 return ret;
 625                         break;
 626                 case MODEL_RD:
 627                         ret = rdtech_rd_set_reg(sdi, REG_RD_OCP_THR, reg_value);
 628                         if (ret != SR_OK)
 629                                 return ret;
 630                         break;
 631                 default:
 632                         return SR_ERR_ARG;
 633                 }
 634         }
 635         if (state->mask & STATE_LOCK) {
 636                 switch (devc->model->model_type) {
 637                 case MODEL_DPS:
 638                         reg_value = state->lock ? 1 : 0;
 639                         ret = rdtech_dps_set_reg(sdi, REG_DPS_LOCK, reg_value);
 640                         if (ret != SR_OK)
 641                                 return ret;
 642                         break;
 643                 case MODEL_RD:
 644                         /* Do nothing, _and_ silently succeed. */
 645                         break;
 646                 default:
 647                         return SR_ERR_ARG;
 648                 }
 649         }
 650         if (state->mask & STATE_RANGE) {
 651                 reg_value = state->range;
 652                 switch (devc->model->model_type) {
 653                 case MODEL_DPS:
 654                         /* DPS models don't support current ranges at all. */
 655                         if (reg_value > 0)
 656                                 return SR_ERR_ARG;
 657                         break;
 658                 case MODEL_RD:
 659                         /*
 660                          * Need not set the range when the device only
 661                          * supports a single fixed range.
 662                          */
 663                         if (devc->model->n_ranges == 1)
 664                                 return SR_OK;
 665                         ret = rdtech_rd_set_reg(sdi, REG_RD_RANGE, reg_value);
 666                         if (ret != SR_OK)
 667                                 return ret;
 668                         /*
 669                          * Immediately update internal state outside of
 670                          * an acquisition. Assume that in-acquisition
 671                          * activity will update internal state. This is
 672                          * essential for meta package emission.
 673                          */
 674                         if (!devc->acquisition_started) {
 675                                 devc->curr_range = reg_value ? 1 : 0;
 676                                 rdtech_dps_update_multipliers(sdi);
 677                         }
 678                         break;
 679                 default:
 680                         return SR_ERR_ARG;
 681                 }
 682         }
 683
 684         return SR_OK;
 685 }
 686
 687 /* Get the current state when acquisition starts. */
 688 SR_PRIV int rdtech_dps_seed_receive(const struct sr_dev_inst *sdi)
 689 {
 690         struct dev_context *devc;
 691         struct rdtech_dps_state state;
 692         int ret;
 693
 694         if (!sdi || !sdi->priv)
 695                 return SR_ERR_ARG;
 696         devc = sdi->priv;
 697         devc->acquisition_started = TRUE;
 698
 699         ret = rdtech_dps_get_state(sdi, &state, ST_CTX_PRE_ACQ);
 700         if (ret != SR_OK)
 701                 return ret;
 702
 703         if (state.mask & STATE_PROTECT_OVP)
 704                 devc->curr_ovp_state = state.protect_ovp;
 705         if (state.mask & STATE_PROTECT_OCP)
 706                 devc->curr_ocp_state = state.protect_ocp;
 707         if (state.mask & STATE_REGULATION_CC)
 708                 devc->curr_cc_state = state.regulation_cc;
 709         if (state.mask & STATE_OUTPUT_ENABLED)
 710                 devc->curr_out_state = state.output_enabled;
 711         if (state.mask & STATE_RANGE) {
 712                 devc->curr_range = state.range;
 713                 rdtech_dps_update_multipliers(sdi);
 714         }
 715
 716         return SR_OK;
 717 }
 718
 719 /* Get measurements, track state changes during acquisition. */
 720 SR_PRIV int rdtech_dps_receive_data(int fd, int revents, void *cb_data)
 721 {
 722         struct sr_dev_inst *sdi;
 723         struct dev_context *devc;
 724         struct rdtech_dps_state state;
 725         int ret;
 726         struct sr_channel *ch;
 727         const char *regulation_text, *range_text;
 728
 729         (void)fd;
 730         (void)revents;
 731
 732         sdi = cb_data;
 733         if (!sdi)
 734                 return TRUE;
 735         devc = sdi->priv;
 736
 737         /* Get the device's current state. */
 738         ret = rdtech_dps_get_state(sdi, &state, ST_CTX_IN_ACQ);
 739         if (ret != SR_OK)
 740                 return ret;
 741
 742
 743         /* Submit measurement data to the session feed. */
 744         std_session_send_df_frame_begin(sdi);
 745         ch = g_slist_nth_data(sdi->channels, 0);
 746         send_value(sdi, ch, state.voltage,
 747                 SR_MQ_VOLTAGE, SR_MQFLAG_DC, SR_UNIT_VOLT,
 748                 devc->model->ranges[devc->curr_range].voltage_digits);
 749         ch = g_slist_nth_data(sdi->channels, 1);
 750         send_value(sdi, ch, state.current,
 751                 SR_MQ_CURRENT, SR_MQFLAG_DC, SR_UNIT_AMPERE,
 752                 devc->model->ranges[devc->curr_range].current_digits);
 753         ch = g_slist_nth_data(sdi->channels, 2);
 754         send_value(sdi, ch, state.power,
 755                 SR_MQ_POWER, 0, SR_UNIT_WATT, 2);
 756         std_session_send_df_frame_end(sdi);
 757
 758         /* Check for state changes. */
 759         if (devc->curr_ovp_state != state.protect_ovp) {
 760                 (void)sr_session_send_meta(sdi,
 761                         SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE,
 762                         g_variant_new_boolean(state.protect_ovp));
 763                 devc->curr_ovp_state = state.protect_ovp;
 764         }
 765         if (devc->curr_ocp_state != state.protect_ocp) {
 766                 (void)sr_session_send_meta(sdi,
 767                         SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE,
 768                         g_variant_new_boolean(state.protect_ocp));
 769                 devc->curr_ocp_state = state.protect_ocp;
 770         }
 771         if (devc->curr_cc_state != state.regulation_cc) {
 772                 regulation_text = state.regulation_cc ? "CC" : "CV";
 773                 (void)sr_session_send_meta(sdi, SR_CONF_REGULATION,
 774                         g_variant_new_string(regulation_text));
 775                 devc->curr_cc_state = state.regulation_cc;
 776         }
 777         if (devc->curr_out_state != state.output_enabled) {
 778                 (void)sr_session_send_meta(sdi, SR_CONF_ENABLED,
 779                         g_variant_new_boolean(state.output_enabled));
 780                 devc->curr_out_state = state.output_enabled;
 781         }
 782         if (devc->curr_range != state.range) {
 783                 range_text = devc->model->ranges[state.range].range_str;
 784                 (void)sr_session_send_meta(sdi, SR_CONF_RANGE,
 785                         g_variant_new_string(range_text));
 786                 devc->curr_range = state.range;
 787                 rdtech_dps_update_multipliers(sdi);
 788         }
 789
 790         /* Check optional acquisition limits. */
 791         sr_sw_limits_update_samples_read(&devc->limits, 1);
 792         if (sr_sw_limits_check(&devc->limits)) {
 793                 sr_dev_acquisition_stop(sdi);
 794                 return TRUE;
 795         }
 796
 797         return TRUE;
 798 }