hwdriver.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <dirent.h>
  24 #include <string.h>
  25 #include <glib.h>
  26 #include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
  27 #include "libsigrok.h"
  28 #include "libsigrok-internal.h"
  29
  30 /* Message logging helpers with subsystem-specific prefix string. */
  31 #define LOG_PREFIX "hwdriver: "
  32 #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
  33 #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
  34 #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
  35 #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
  36 #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
  37 #define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
  38
  39 /**
  40  * @file
  41  *
  42  * Hardware driver handling in libsigrok.
  43  */
  44
  45 /**
  46  * @defgroup grp_driver Hardware drivers
  47  *
  48  * Hardware driver handling in libsigrok.
  49  *
  50  * @{
  51  */
  52
  53 static struct sr_config_info sr_config_info_data[] = {
  54         {SR_CONF_CONN, SR_T_CHAR, "conn",
  55                 "Connection", NULL},
  56         {SR_CONF_SERIALCOMM, SR_T_CHAR, "serialcomm",
  57                 "Serial communication", NULL},
  58         {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
  59                 "Sample rate", NULL},
  60         {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
  61                 "Pre-trigger capture ratio", NULL},
  62         {SR_CONF_PATTERN_MODE, SR_T_CHAR, "pattern",
  63                 "Pattern generator mode", NULL},
  64         {SR_CONF_TRIGGER_TYPE, SR_T_CHAR, "triggertype",
  65                 "Trigger types", NULL},
  66         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
  67                 "External clock mode", NULL},
  68         {SR_CONF_SWAP, SR_T_BOOL, "swap",
  69                 "Swap channel order", NULL},
  70         {SR_CONF_RLE, SR_T_BOOL, "rle",
  71                 "Run Length Encoding", NULL},
  72         {SR_CONF_TRIGGER_SLOPE, SR_T_UINT64, "triggerslope",
  73                 "Trigger slope", NULL},
  74         {SR_CONF_TRIGGER_SOURCE, SR_T_CHAR, "triggersource",
  75                 "Trigger source", NULL},
  76         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
  77                 "Horizontal trigger position", NULL},
  78         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
  79                 "Buffer size", NULL},
  80         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
  81                 "Time base", NULL},
  82         {SR_CONF_FILTER, SR_T_CHAR, "filter",
  83                 "Filter targets", NULL},
  84         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
  85                 "Volts/div", NULL},
  86         {SR_CONF_COUPLING, SR_T_CHAR, "coupling",
  87                 "Coupling", NULL},
  88         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
  89                 "Datalog", NULL},
  90         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_CHAR, "spl_weight_freq",
  91                 "Sound pressure level frequency weighting", NULL},
  92         {SR_CONF_SPL_WEIGHT_TIME, SR_T_CHAR, "spl_weight_time",
  93                 "Sound pressure level time weighting", NULL},
  94         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
  95                 "Hold max", NULL},
  96         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
  97                 "Hold min", NULL},
  98         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
  99                 "Sound pressure level measurement range", NULL},
 100         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
 101                 "Voltage threshold", NULL },
 102         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
 103                 "Power off", NULL},
 104         {SR_CONF_DATA_SOURCE, SR_T_CHAR, "data_source",
 105                 "Data source", NULL},
 106         {0, 0, NULL, NULL, NULL},
 107 };
 108
 109 /** @cond PRIVATE */
 110 #ifdef HAVE_HW_BRYMEN_DMM
 111 extern SR_PRIV struct sr_dev_driver brymen_bm857_driver_info;
 112 #endif
 113 #ifdef HAVE_HW_CEM_DT_885X
 114 extern SR_PRIV struct sr_dev_driver cem_dt_885x_driver_info;
 115 #endif
 116 #ifdef HAVE_HW_CENTER_3XX
 117 extern SR_PRIV struct sr_dev_driver center_309_driver_info;
 118 extern SR_PRIV struct sr_dev_driver voltcraft_k204_driver_info;
 119 #endif
 120 #ifdef HAVE_HW_COLEAD_SLM
 121 extern SR_PRIV struct sr_dev_driver colead_slm_driver_info;
 122 #endif
 123 #ifdef HAVE_HW_DEMO
 124 extern SR_PRIV struct sr_dev_driver demo_driver_info;
 125 #endif
 126 #ifdef HAVE_HW_GMC_MH_1X_2X
 127 extern SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;
 128 #endif
 129 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 130 extern SR_PRIV struct sr_dev_driver ikalogic_scanalogic2_driver_info;
 131 #endif
 132 #ifdef HAVE_HW_IKALOGIC_SCANAPLUS
 133 extern SR_PRIV struct sr_dev_driver ikalogic_scanaplus_driver_info;
 134 #endif
 135 #ifdef HAVE_HW_KECHENG_KC_330B
 136 extern SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info;
 137 #endif
 138 #ifdef HAVE_HW_LASCAR_EL_USB
 139 extern SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
 140 #endif
 141 #ifdef HAVE_HW_MIC_985XX
 142 extern SR_PRIV struct sr_dev_driver mic_98581_driver_info;
 143 extern SR_PRIV struct sr_dev_driver mic_98583_driver_info;
 144 #endif
 145 #ifdef HAVE_HW_NORMA_DMM
 146 extern SR_PRIV struct sr_dev_driver norma_dmm_driver_info;
 147 #endif
 148 #ifdef HAVE_HW_OLS
 149 extern SR_PRIV struct sr_dev_driver ols_driver_info;
 150 #endif
 151 #ifdef HAVE_HW_RIGOL_DS
 152 extern SR_PRIV struct sr_dev_driver rigol_ds_driver_info;
 153 #endif
 154 #ifdef HAVE_HW_SALEAE_LOGIC16
 155 extern SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
 156 #endif
 157 #ifdef HAVE_HW_TELEINFO
 158 extern SR_PRIV struct sr_dev_driver teleinfo_driver_info;
 159 #endif
 160 #ifdef HAVE_HW_TONDAJ_SL_814
 161 extern SR_PRIV struct sr_dev_driver tondaj_sl_814_driver_info;
 162 #endif
 163 #ifdef HAVE_HW_UNI_T_UT32X
 164 extern SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
 165 #endif
 166 #ifdef HAVE_HW_VICTOR_DMM
 167 extern SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
 168 #endif
 169 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 170 extern SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
 171 #endif
 172 #ifdef HAVE_HW_ASIX_SIGMA
 173 extern SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
 174 #endif
 175 #ifdef HAVE_HW_CHRONOVU_LA8
 176 extern SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
 177 #endif
 178 #ifdef HAVE_HW_LINK_MSO19
 179 extern SR_PRIV struct sr_dev_driver link_mso19_driver_info;
 180 #endif
 181 #ifdef HAVE_HW_ALSA
 182 extern SR_PRIV struct sr_dev_driver alsa_driver_info;
 183 #endif
 184 #ifdef HAVE_HW_FX2LAFW
 185 extern SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
 186 #endif
 187 #ifdef HAVE_HW_HANTEK_DSO
 188 extern SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 189 #endif
 190 #ifdef HAVE_HW_AGILENT_DMM
 191 extern SR_PRIV struct sr_dev_driver agdmm_driver_info;
 192 #endif
 193 #ifdef HAVE_HW_FLUKE_DMM
 194 extern SR_PRIV struct sr_dev_driver flukedmm_driver_info;
 195 #endif
 196 #ifdef HAVE_HW_SERIAL_DMM
 197 extern SR_PRIV struct sr_dev_driver digitek_dt4000zc_driver_info;
 198 extern SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
 199 extern SR_PRIV struct sr_dev_driver metex_me31_driver_info;
 200 extern SR_PRIV struct sr_dev_driver peaktech_3410_driver_info;
 201 extern SR_PRIV struct sr_dev_driver mastech_mas345_driver_info;
 202 extern SR_PRIV struct sr_dev_driver va_va18b_driver_info;
 203 extern SR_PRIV struct sr_dev_driver metex_m3640d_driver_info;
 204 extern SR_PRIV struct sr_dev_driver metex_m4650cr_driver_info;
 205 extern SR_PRIV struct sr_dev_driver peaktech_4370_driver_info;
 206 extern SR_PRIV struct sr_dev_driver pce_pce_dm32_driver_info;
 207 extern SR_PRIV struct sr_dev_driver radioshack_22_168_driver_info;
 208 extern SR_PRIV struct sr_dev_driver radioshack_22_805_driver_info;
 209 extern SR_PRIV struct sr_dev_driver radioshack_22_812_driver_info;
 210 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_ser_driver_info;
 211 extern SR_PRIV struct sr_dev_driver voltcraft_m3650d_driver_info;
 212 extern SR_PRIV struct sr_dev_driver voltcraft_m4650cr_driver_info;
 213 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_ser_driver_info;
 214 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_ser_driver_info;
 215 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_ser_driver_info;
 216 extern SR_PRIV struct sr_dev_driver uni_t_ut60a_ser_driver_info;
 217 extern SR_PRIV struct sr_dev_driver uni_t_ut60e_ser_driver_info;
 218 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_ser_driver_info;
 219 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_ser_driver_info;
 220 extern SR_PRIV struct sr_dev_driver iso_tech_idm103n_driver_info;
 221 #endif
 222 #ifdef HAVE_HW_UNI_T_DMM
 223 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_driver_info;
 224 extern SR_PRIV struct sr_dev_driver uni_t_ut60a_driver_info;
 225 extern SR_PRIV struct sr_dev_driver uni_t_ut60e_driver_info;
 226 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
 227 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_driver_info;
 228 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
 229 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_driver_info;
 230 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 231 extern SR_PRIV struct sr_dev_driver tenma_72_7745_driver_info;
 232 #endif
 233 /** @endcond */
 234
 235 static struct sr_dev_driver *drivers_list[] = {
 236 #ifdef HAVE_HW_BRYMEN_DMM
 237         &brymen_bm857_driver_info,
 238 #endif
 239 #ifdef HAVE_HW_CEM_DT_885X
 240         &cem_dt_885x_driver_info,
 241 #endif
 242 #ifdef HAVE_HW_CENTER_3XX
 243         &center_309_driver_info,
 244         &voltcraft_k204_driver_info,
 245 #endif
 246 #ifdef HAVE_HW_COLEAD_SLM
 247         &colead_slm_driver_info,
 248 #endif
 249 #ifdef HAVE_HW_DEMO
 250         &demo_driver_info,
 251 #endif
 252 #ifdef HAVE_HW_GMC_MH_1X_2X
 253         &gmc_mh_1x_2x_rs232_driver_info,
 254 #endif
 255 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 256         &ikalogic_scanalogic2_driver_info,
 257 #endif
 258 #ifdef HAVE_HW_IKALOGIC_SCANAPLUS
 259         &ikalogic_scanaplus_driver_info,
 260 #endif
 261 #ifdef HAVE_HW_KECHENG_KC_330B
 262         &kecheng_kc_330b_driver_info,
 263 #endif
 264 #ifdef HAVE_HW_LASCAR_EL_USB
 265         &lascar_el_usb_driver_info,
 266 #endif
 267 #ifdef HAVE_HW_MIC_985XX
 268         &mic_98581_driver_info,
 269         &mic_98583_driver_info,
 270 #endif
 271 #ifdef HAVE_HW_NORMA_DMM
 272         &norma_dmm_driver_info,
 273 #endif
 274 #ifdef HAVE_HW_OLS
 275         &ols_driver_info,
 276 #endif
 277 #ifdef HAVE_HW_RIGOL_DS
 278         &rigol_ds_driver_info,
 279 #endif
 280 #ifdef HAVE_HW_SALEAE_LOGIC16
 281         &saleae_logic16_driver_info,
 282 #endif
 283 #ifdef HAVE_HW_TELEINFO
 284         &teleinfo_driver_info,
 285 #endif
 286 #ifdef HAVE_HW_TONDAJ_SL_814
 287         &tondaj_sl_814_driver_info,
 288 #endif
 289 #ifdef HAVE_HW_UNI_T_UT32X
 290         &uni_t_ut32x_driver_info,
 291 #endif
 292 #ifdef HAVE_HW_VICTOR_DMM
 293         &victor_dmm_driver_info,
 294 #endif
 295 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 296         &zeroplus_logic_cube_driver_info,
 297 #endif
 298 #ifdef HAVE_HW_ASIX_SIGMA
 299         &asix_sigma_driver_info,
 300 #endif
 301 #ifdef HAVE_HW_CHRONOVU_LA8
 302         &chronovu_la8_driver_info,
 303 #endif
 304 #ifdef HAVE_HW_LINK_MSO19
 305         &link_mso19_driver_info,
 306 #endif
 307 #ifdef HAVE_HW_ALSA
 308         &alsa_driver_info,
 309 #endif
 310 #ifdef HAVE_HW_FX2LAFW
 311         &fx2lafw_driver_info,
 312 #endif
 313 #ifdef HAVE_HW_HANTEK_DSO
 314         &hantek_dso_driver_info,
 315 #endif
 316 #ifdef HAVE_HW_AGILENT_DMM
 317         &agdmm_driver_info,
 318 #endif
 319 #ifdef HAVE_HW_FLUKE_DMM
 320         &flukedmm_driver_info,
 321 #endif
 322 #ifdef HAVE_HW_SERIAL_DMM
 323         &digitek_dt4000zc_driver_info,
 324         &tekpower_tp4000zc_driver_info,
 325         &metex_me31_driver_info,
 326         &peaktech_3410_driver_info,
 327         &mastech_mas345_driver_info,
 328         &va_va18b_driver_info,
 329         &metex_m3640d_driver_info,
 330         &metex_m4650cr_driver_info,
 331         &peaktech_4370_driver_info,
 332         &pce_pce_dm32_driver_info,
 333         &radioshack_22_168_driver_info,
 334         &radioshack_22_805_driver_info,
 335         &radioshack_22_812_driver_info,
 336         &tecpel_dmm_8061_ser_driver_info,
 337         &voltcraft_m3650d_driver_info,
 338         &voltcraft_m4650cr_driver_info,
 339         &voltcraft_vc820_ser_driver_info,
 340         &voltcraft_vc830_ser_driver_info,
 341         &voltcraft_vc840_ser_driver_info,
 342         &uni_t_ut60a_ser_driver_info,
 343         &uni_t_ut60e_ser_driver_info,
 344         &uni_t_ut61d_ser_driver_info,
 345         &uni_t_ut61e_ser_driver_info,
 346         &iso_tech_idm103n_driver_info,
 347 #endif
 348 #ifdef HAVE_HW_UNI_T_DMM
 349         &tecpel_dmm_8061_driver_info,
 350         &uni_t_ut60a_driver_info,
 351         &uni_t_ut60e_driver_info,
 352         &uni_t_ut61d_driver_info,
 353         &uni_t_ut61e_driver_info,
 354         &voltcraft_vc820_driver_info,
 355         &voltcraft_vc830_driver_info,
 356         &voltcraft_vc840_driver_info,
 357         &tenma_72_7745_driver_info,
 358 #endif
 359         NULL,
 360 };
 361
 362 /**
 363  * Return the list of supported hardware drivers.
 364  *
 365  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 366  */
 367 SR_API struct sr_dev_driver **sr_driver_list(void)
 368 {
 369
 370         return drivers_list;
 371 }
 372
 373 /**
 374  * Initialize a hardware driver.
 375  *
 376  * This usually involves memory allocations and variable initializations
 377  * within the driver, but _not_ scanning for attached devices.
 378  * The API call sr_driver_scan() is used for that.
 379  *
 380  * @param ctx A libsigrok context object allocated by a previous call to
 381  *            sr_init(). Must not be NULL.
 382  * @param driver The driver to initialize. This must be a pointer to one of
 383  *               the entries returned by sr_driver_list(). Must not be NULL.
 384  *
 385  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 386  *         SR_ERR_BUG upon internal errors, or another negative error code
 387  *         upon other errors.
 388  */
 389 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 390 {
 391         int ret;
 392
 393         if (!ctx) {
 394                 sr_err("Invalid libsigrok context, can't initialize.");
 395                 return SR_ERR_ARG;
 396         }
 397
 398         if (!driver) {
 399                 sr_err("Invalid driver, can't initialize.");
 400                 return SR_ERR_ARG;
 401         }
 402
 403         sr_spew("Initializing driver '%s'.", driver->name);
 404         if ((ret = driver->init(ctx)) < 0)
 405                 sr_err("Failed to initialize the driver: %d.", ret);
 406
 407         return ret;
 408 }
 409
 410 /**
 411  * Tell a hardware driver to scan for devices.
 412  *
 413  * In addition to the detection, the devices that are found are also
 414  * initialized automatically. On some devices, this involves a firmware upload,
 415  * or other such measures.
 416  *
 417  * The order in which the system is scanned for devices is not specified. The
 418  * caller should not assume or rely on any specific order.
 419  *
 420  * Before calling sr_driver_scan(), the user must have previously initialized
 421  * the driver by calling sr_driver_init().
 422  *
 423  * @param driver The driver that should scan. This must be a pointer to one of
 424  *               the entries returned by sr_driver_list(). Must not be NULL.
 425  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 426  *                scanner. Can be NULL/empty.
 427  *
 428  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 429  *         found (or errors were encountered). This list must be freed by the
 430  *         caller using g_slist_free(), but without freeing the data pointed
 431  *         to in the list.
 432  */
 433 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 434 {
 435         GSList *l;
 436
 437         if (!driver) {
 438                 sr_err("Invalid driver, can't scan for devices.");
 439                 return NULL;
 440         }
 441
 442         if (!driver->priv) {
 443                 sr_err("Driver not initialized, can't scan for devices.");
 444                 return NULL;
 445         }
 446
 447         l = driver->scan(options);
 448
 449         sr_spew("Scan of '%s' found %d devices.", driver->name,
 450                 g_slist_length(l));
 451
 452         return l;
 453 }
 454
 455 /** @private */
 456 SR_PRIV void sr_hw_cleanup_all(void)
 457 {
 458         int i;
 459         struct sr_dev_driver **drivers;
 460
 461         drivers = sr_driver_list();
 462         for (i = 0; drivers[i]; i++) {
 463                 if (drivers[i]->cleanup)
 464                         drivers[i]->cleanup();
 465         }
 466 }
 467
 468 /** A floating reference can be passed in for data.
 469  * @private */
 470 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 471 {
 472         struct sr_config *src;
 473
 474         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 475                 return NULL;
 476         src->key = key;
 477         src->data = g_variant_ref_sink(data);
 478
 479         return src;
 480 }
 481
 482 /** @private */
 483 SR_PRIV void sr_config_free(struct sr_config *src)
 484 {
 485
 486         if (!src || !src->data) {
 487                 sr_err("%s: invalid data!", __func__);
 488                 return;
 489         }
 490
 491         g_variant_unref(src->data);
 492         g_free(src);
 493
 494 }
 495
 496 /**
 497  * Returns information about the given driver or device instance.
 498  *
 499  * @param driver The sr_dev_driver struct to query.
 500  * @param sdi (optional) If the key is specific to a device, this must
 501  *            contain a pointer to the struct sr_dev_inst to be checked.
 502  *            Otherwise it must be NULL.
 503  * @param probe_group The probe group on the device for which to list the
 504  *                    values, or NULL.
 505  * @param key The configuration key (SR_CONF_*).
 506  * @param data Pointer to a GVariant where the value will be stored. Must
 507  *             not be NULL. The caller is given ownership of the GVariant
 508  *             and must thus decrease the refcount after use. However if
 509  *             this function returns an error code, the field should be
 510  *             considered unused, and should not be unreferenced.
 511  *
 512  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 513  *         may be returned by the driver indicating it doesn't know that key,
 514  *         but this is not to be flagged as an error by the caller; merely
 515  *         as an indication that it's not applicable.
 516  */
 517 SR_API int sr_config_get(const struct sr_dev_driver *driver,
 518                 const struct sr_dev_inst *sdi,
 519                 const struct sr_probe_group *probe_group,
 520                 int key, GVariant **data)
 521 {
 522         int ret;
 523
 524         if (!driver || !data)
 525                 return SR_ERR;
 526
 527         if (!driver->config_get)
 528                 return SR_ERR_ARG;
 529
 530         if ((ret = driver->config_get(key, data, sdi, probe_group)) == SR_OK) {
 531                 /* Got a floating reference from the driver. Sink it here,
 532                  * caller will need to unref when done with it. */
 533                 g_variant_ref_sink(*data);
 534         }
 535
 536         return ret;
 537 }
 538
 539 /**
 540  * Set a configuration key in a device instance.
 541  *
 542  * @param sdi The device instance.
 543  * @param probe_group The probe group on the device for which to list the
 544  *                    values, or NULL.
 545  * @param key The configuration key (SR_CONF_*).
 546  * @param data The new value for the key, as a GVariant with GVariantType
 547  *        appropriate to that key. A floating reference can be passed
 548  *        in; its refcount will be sunk and unreferenced after use.
 549  *
 550  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 551  *         may be returned by the driver indicating it doesn't know that key,
 552  *         but this is not to be flagged as an error by the caller; merely
 553  *         as an indication that it's not applicable.
 554  */
 555 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
 556                 const struct sr_probe_group *probe_group,
 557                 int key, GVariant *data)
 558 {
 559         int ret;
 560
 561         g_variant_ref_sink(data);
 562
 563         if (!sdi || !sdi->driver || !data)
 564                 ret = SR_ERR;
 565         else if (!sdi->driver->config_set)
 566                 ret = SR_ERR_ARG;
 567         else
 568                 ret = sdi->driver->config_set(key, data, sdi, probe_group);
 569
 570         g_variant_unref(data);
 571
 572         return ret;
 573 }
 574
 575 /**
 576  * List all possible values for a configuration key.
 577  *
 578  * @param driver The sr_dev_driver struct to query.
 579  * @param sdi (optional) If the key is specific to a device, this must
 580  *            contain a pointer to the struct sr_dev_inst to be checked.
 581  * @param probe_group The probe group on the device for which to list the
 582  *                    values, or NULL.
 583  * @param key The configuration key (SR_CONF_*).
 584  * @param data A pointer to a GVariant where the list will be stored. The
 585  *             caller is given ownership of the GVariant and must thus
 586  *             unref the GVariant after use. However if this function
 587  *             returns an error code, the field should be considered
 588  *             unused, and should not be unreferenced.
 589  *
 590  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 591  *         may be returned by the driver indicating it doesn't know that key,
 592  *         but this is not to be flagged as an error by the caller; merely
 593  *         as an indication that it's not applicable.
 594  */
 595 SR_API int sr_config_list(const struct sr_dev_driver *driver,
 596                 const struct sr_dev_inst *sdi,
 597                 const struct sr_probe_group *probe_group,
 598                 int key, GVariant **data)
 599 {
 600         int ret;
 601
 602         if (!driver || !data)
 603                 ret = SR_ERR;
 604         else if (!driver->config_list)
 605                 ret = SR_ERR_ARG;
 606         else if ((ret = driver->config_list(key, data, sdi, probe_group)) == SR_OK)
 607                 g_variant_ref_sink(*data);
 608
 609         return ret;
 610 }
 611
 612 /**
 613  * Get information about a configuration key.
 614  *
 615  * @param key The configuration key.
 616  *
 617  * @return A pointer to a struct sr_config_info, or NULL if the key
 618  *         was not found.
 619  */
 620 SR_API const struct sr_config_info *sr_config_info_get(int key)
 621 {
 622         int i;
 623
 624         for (i = 0; sr_config_info_data[i].key; i++) {
 625                 if (sr_config_info_data[i].key == key)
 626                         return &sr_config_info_data[i];
 627         }
 628
 629         return NULL;
 630 }
 631
 632 /**
 633  * Get information about an configuration key, by name.
 634  *
 635  * @param optname The configuration key.
 636  *
 637  * @return A pointer to a struct sr_config_info, or NULL if the key
 638  *         was not found.
 639  */
 640 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 641 {
 642         int i;
 643
 644         for (i = 0; sr_config_info_data[i].key; i++) {
 645                 if (!strcmp(sr_config_info_data[i].id, optname))
 646                         return &sr_config_info_data[i];
 647         }
 648
 649         return NULL;
 650 }
 651
 652 /* Unnecessary level of indirection follows. */
 653
 654 /** @private */
 655 SR_PRIV int sr_source_remove(int fd)
 656 {
 657         return sr_session_source_remove(fd);
 658 }
 659
 660 /** @private */
 661 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 662                           sr_receive_data_callback_t cb, void *cb_data)
 663 {
 664         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 665 }
 666
 667 /** @} */