-const char *get_vendor(const char *raw_vendor);
-SR_PRIV char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command);
-SR_PRIV int scpi_cmd(const struct sr_dev_inst *sdi, int command, ...);
-SR_PRIV int scpi_cmd_resp(const struct sr_dev_inst *sdi, GVariant **gvar,
- const GVariantType *gvtype, int command, ...);