+SR_PRIV int rdtech_dps_read_holding_registers(struct sr_modbus_dev_inst *modbus,
+ int address, int nb_registers, uint16_t *registers)
+{
+ int i, ret;
+
+ i = 0;
+ do {
+ ret = sr_modbus_read_holding_registers(modbus,
+ address, nb_registers, registers);
+ ++i;
+ } while (ret != SR_OK && i < 3);
+
+ return ret;
+}
+
+SR_PRIV int rdtech_dps_get_reg(const struct sr_dev_inst *sdi,
+ uint16_t address, uint16_t *value)
+{
+ struct dev_context *devc;
+ struct sr_modbus_dev_inst *modbus;
+ uint16_t registers[1];
+ int ret;
+
+ devc = sdi->priv;
+ modbus = sdi->conn;
+
+ g_mutex_lock(&devc->rw_mutex);
+ ret = rdtech_dps_read_holding_registers(modbus, address, 1, registers);
+ g_mutex_unlock(&devc->rw_mutex);
+ *value = RB16(registers + 0);
+ return ret;
+}
+
+SR_PRIV int rdtech_dps_set_reg(const struct sr_dev_inst *sdi,
+ uint16_t address, uint16_t value)
+{
+ struct dev_context *devc;
+ struct sr_modbus_dev_inst *modbus;
+ uint16_t registers[1];
+ int ret;
+
+ devc = sdi->priv;
+ modbus = sdi->conn;
+
+ WB16(registers, value);
+ g_mutex_lock(&devc->rw_mutex);
+ ret = sr_modbus_write_multiple_registers(modbus, address, 1, registers);
+ g_mutex_unlock(&devc->rw_mutex);
+ return ret;
+}
+
+SR_PRIV int rdtech_dps_get_model_version(struct sr_modbus_dev_inst *modbus,
+ uint16_t *model, uint16_t *version)
+{
+ uint16_t registers[2];
+ int ret;
+
+ /*
+ * No mutex here, because there is no sr_dev_inst when this function
+ * is called.
+ */
+ ret = rdtech_dps_read_holding_registers(modbus, REG_MODEL, 2, registers);
+ if (ret == SR_OK) {
+ *model = RB16(registers + 0);
+ *version = RB16(registers + 1);
+ sr_info("RDTech PSU model: %d version: %d", *model, *version);
+ }
+ return ret;
+}
+
+static void send_value(const struct sr_dev_inst *sdi, struct sr_channel *ch,
+ float value, enum sr_mq mq, enum sr_mqflag mqflags,
+ enum sr_unit unit, int digits)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+
+ sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
+ analog.meaning->channels = g_slist_append(NULL, ch);
+ analog.num_samples = 1;
+ analog.data = &value;
+ analog.meaning->mq = mq;
+ analog.meaning->mqflags = mqflags;
+ analog.meaning->unit = unit;
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(sdi, &packet);
+ g_slist_free(analog.meaning->channels);
+}
+