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_HAMEG_HMO
 130 extern SR_PRIV struct sr_dev_driver hameg_hmo_driver_info;
 131 #endif
 132 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 133 extern SR_PRIV struct sr_dev_driver ikalogic_scanalogic2_driver_info;
 134 #endif
 135 #ifdef HAVE_HW_IKALOGIC_SCANAPLUS
 136 extern SR_PRIV struct sr_dev_driver ikalogic_scanaplus_driver_info;
 137 #endif
 138 #ifdef HAVE_HW_KECHENG_KC_330B
 139 extern SR_PRIV struct sr_dev_driver kecheng_kc_330b_driver_info;
 140 #endif
 141 #ifdef HAVE_HW_LASCAR_EL_USB
 142 extern SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
 143 #endif
 144 #ifdef HAVE_HW_MIC_985XX
 145 extern SR_PRIV struct sr_dev_driver mic_98581_driver_info;
 146 extern SR_PRIV struct sr_dev_driver mic_98583_driver_info;
 147 #endif
 148 #ifdef HAVE_HW_NORMA_DMM
 149 extern SR_PRIV struct sr_dev_driver norma_dmm_driver_info;
 150 #endif
 151 #ifdef HAVE_HW_OLS
 152 extern SR_PRIV struct sr_dev_driver ols_driver_info;
 153 #endif
 154 #ifdef HAVE_HW_RIGOL_DS
 155 extern SR_PRIV struct sr_dev_driver rigol_ds_driver_info;
 156 #endif
 157 #ifdef HAVE_HW_SALEAE_LOGIC16
 158 extern SR_PRIV struct sr_dev_driver saleae_logic16_driver_info;
 159 #endif
 160 #ifdef HAVE_HW_TELEINFO
 161 extern SR_PRIV struct sr_dev_driver teleinfo_driver_info;
 162 #endif
 163 #ifdef HAVE_HW_TONDAJ_SL_814
 164 extern SR_PRIV struct sr_dev_driver tondaj_sl_814_driver_info;
 165 #endif
 166 #ifdef HAVE_HW_UNI_T_UT32X
 167 extern SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
 168 #endif
 169 #ifdef HAVE_HW_VICTOR_DMM
 170 extern SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
 171 #endif
 172 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 173 extern SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
 174 #endif
 175 #ifdef HAVE_HW_ASIX_SIGMA
 176 extern SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
 177 #endif
 178 #ifdef HAVE_HW_CHRONOVU_LA8
 179 extern SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
 180 #endif
 181 #ifdef HAVE_HW_LINK_MSO19
 182 extern SR_PRIV struct sr_dev_driver link_mso19_driver_info;
 183 #endif
 184 #ifdef HAVE_HW_ALSA
 185 extern SR_PRIV struct sr_dev_driver alsa_driver_info;
 186 #endif
 187 #ifdef HAVE_HW_FX2LAFW
 188 extern SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
 189 #endif
 190 #ifdef HAVE_HW_HANTEK_DSO
 191 extern SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 192 #endif
 193 #ifdef HAVE_HW_AGILENT_DMM
 194 extern SR_PRIV struct sr_dev_driver agdmm_driver_info;
 195 #endif
 196 #ifdef HAVE_HW_FLUKE_DMM
 197 extern SR_PRIV struct sr_dev_driver flukedmm_driver_info;
 198 #endif
 199 #ifdef HAVE_HW_SERIAL_DMM
 200 extern SR_PRIV struct sr_dev_driver bbcgm_m2110_driver_info;
 201 extern SR_PRIV struct sr_dev_driver digitek_dt4000zc_driver_info;
 202 extern SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
 203 extern SR_PRIV struct sr_dev_driver metex_me31_driver_info;
 204 extern SR_PRIV struct sr_dev_driver peaktech_3410_driver_info;
 205 extern SR_PRIV struct sr_dev_driver mastech_mas345_driver_info;
 206 extern SR_PRIV struct sr_dev_driver va_va18b_driver_info;
 207 extern SR_PRIV struct sr_dev_driver metex_m3640d_driver_info;
 208 extern SR_PRIV struct sr_dev_driver metex_m4650cr_driver_info;
 209 extern SR_PRIV struct sr_dev_driver peaktech_4370_driver_info;
 210 extern SR_PRIV struct sr_dev_driver pce_pce_dm32_driver_info;
 211 extern SR_PRIV struct sr_dev_driver radioshack_22_168_driver_info;
 212 extern SR_PRIV struct sr_dev_driver radioshack_22_805_driver_info;
 213 extern SR_PRIV struct sr_dev_driver radioshack_22_812_driver_info;
 214 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_ser_driver_info;
 215 extern SR_PRIV struct sr_dev_driver voltcraft_m3650d_driver_info;
 216 extern SR_PRIV struct sr_dev_driver voltcraft_m4650cr_driver_info;
 217 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_ser_driver_info;
 218 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_ser_driver_info;
 219 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_ser_driver_info;
 220 extern SR_PRIV struct sr_dev_driver uni_t_ut60a_ser_driver_info;
 221 extern SR_PRIV struct sr_dev_driver uni_t_ut60e_ser_driver_info;
 222 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_ser_driver_info;
 223 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_ser_driver_info;
 224 extern SR_PRIV struct sr_dev_driver iso_tech_idm103n_driver_info;
 225 #endif
 226 #ifdef HAVE_HW_UNI_T_DMM
 227 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_driver_info;
 228 extern SR_PRIV struct sr_dev_driver uni_t_ut60a_driver_info;
 229 extern SR_PRIV struct sr_dev_driver uni_t_ut60e_driver_info;
 230 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
 231 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_driver_info;
 232 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
 233 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_driver_info;
 234 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 235 extern SR_PRIV struct sr_dev_driver tenma_72_7745_driver_info;
 236 #endif
 237 /** @endcond */
 238
 239 static struct sr_dev_driver *drivers_list[] = {
 240 #ifdef HAVE_HW_BRYMEN_DMM
 241         &brymen_bm857_driver_info,
 242 #endif
 243 #ifdef HAVE_HW_CEM_DT_885X
 244         &cem_dt_885x_driver_info,
 245 #endif
 246 #ifdef HAVE_HW_CENTER_3XX
 247         &center_309_driver_info,
 248         &voltcraft_k204_driver_info,
 249 #endif
 250 #ifdef HAVE_HW_COLEAD_SLM
 251         &colead_slm_driver_info,
 252 #endif
 253 #ifdef HAVE_HW_DEMO
 254         &demo_driver_info,
 255 #endif
 256 #ifdef HAVE_HW_GMC_MH_1X_2X
 257         &gmc_mh_1x_2x_rs232_driver_info,
 258 #endif
 259 #ifdef HAVE_HW_HAMEG_HMO
 260         &hameg_hmo_driver_info,
 261 #endif
 262 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 263         &ikalogic_scanalogic2_driver_info,
 264 #endif
 265 #ifdef HAVE_HW_IKALOGIC_SCANAPLUS
 266         &ikalogic_scanaplus_driver_info,
 267 #endif
 268 #ifdef HAVE_HW_KECHENG_KC_330B
 269         &kecheng_kc_330b_driver_info,
 270 #endif
 271 #ifdef HAVE_HW_LASCAR_EL_USB
 272         &lascar_el_usb_driver_info,
 273 #endif
 274 #ifdef HAVE_HW_MIC_985XX
 275         &mic_98581_driver_info,
 276         &mic_98583_driver_info,
 277 #endif
 278 #ifdef HAVE_HW_NORMA_DMM
 279         &norma_dmm_driver_info,
 280 #endif
 281 #ifdef HAVE_HW_OLS
 282         &ols_driver_info,
 283 #endif
 284 #ifdef HAVE_HW_RIGOL_DS
 285         &rigol_ds_driver_info,
 286 #endif
 287 #ifdef HAVE_HW_SALEAE_LOGIC16
 288         &saleae_logic16_driver_info,
 289 #endif
 290 #ifdef HAVE_HW_TELEINFO
 291         &teleinfo_driver_info,
 292 #endif
 293 #ifdef HAVE_HW_TONDAJ_SL_814
 294         &tondaj_sl_814_driver_info,
 295 #endif
 296 #ifdef HAVE_HW_UNI_T_UT32X
 297         &uni_t_ut32x_driver_info,
 298 #endif
 299 #ifdef HAVE_HW_VICTOR_DMM
 300         &victor_dmm_driver_info,
 301 #endif
 302 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 303         &zeroplus_logic_cube_driver_info,
 304 #endif
 305 #ifdef HAVE_HW_ASIX_SIGMA
 306         &asix_sigma_driver_info,
 307 #endif
 308 #ifdef HAVE_HW_CHRONOVU_LA8
 309         &chronovu_la8_driver_info,
 310 #endif
 311 #ifdef HAVE_HW_LINK_MSO19
 312         &link_mso19_driver_info,
 313 #endif
 314 #ifdef HAVE_HW_ALSA
 315         &alsa_driver_info,
 316 #endif
 317 #ifdef HAVE_HW_FX2LAFW
 318         &fx2lafw_driver_info,
 319 #endif
 320 #ifdef HAVE_HW_HANTEK_DSO
 321         &hantek_dso_driver_info,
 322 #endif
 323 #ifdef HAVE_HW_AGILENT_DMM
 324         &agdmm_driver_info,
 325 #endif
 326 #ifdef HAVE_HW_FLUKE_DMM
 327         &flukedmm_driver_info,
 328 #endif
 329 #ifdef HAVE_HW_SERIAL_DMM
 330         &bbcgm_m2110_driver_info,
 331         &digitek_dt4000zc_driver_info,
 332         &tekpower_tp4000zc_driver_info,
 333         &metex_me31_driver_info,
 334         &peaktech_3410_driver_info,
 335         &mastech_mas345_driver_info,
 336         &va_va18b_driver_info,
 337         &metex_m3640d_driver_info,
 338         &metex_m4650cr_driver_info,
 339         &peaktech_4370_driver_info,
 340         &pce_pce_dm32_driver_info,
 341         &radioshack_22_168_driver_info,
 342         &radioshack_22_805_driver_info,
 343         &radioshack_22_812_driver_info,
 344         &tecpel_dmm_8061_ser_driver_info,
 345         &voltcraft_m3650d_driver_info,
 346         &voltcraft_m4650cr_driver_info,
 347         &voltcraft_vc820_ser_driver_info,
 348         &voltcraft_vc830_ser_driver_info,
 349         &voltcraft_vc840_ser_driver_info,
 350         &uni_t_ut60a_ser_driver_info,
 351         &uni_t_ut60e_ser_driver_info,
 352         &uni_t_ut61d_ser_driver_info,
 353         &uni_t_ut61e_ser_driver_info,
 354         &iso_tech_idm103n_driver_info,
 355 #endif
 356 #ifdef HAVE_HW_UNI_T_DMM
 357         &tecpel_dmm_8061_driver_info,
 358         &uni_t_ut60a_driver_info,
 359         &uni_t_ut60e_driver_info,
 360         &uni_t_ut61d_driver_info,
 361         &uni_t_ut61e_driver_info,
 362         &voltcraft_vc820_driver_info,
 363         &voltcraft_vc830_driver_info,
 364         &voltcraft_vc840_driver_info,
 365         &tenma_72_7745_driver_info,
 366 #endif
 367         NULL,
 368 };
 369
 370 /**
 371  * Return the list of supported hardware drivers.
 372  *
 373  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 374  */
 375 SR_API struct sr_dev_driver **sr_driver_list(void)
 376 {
 377
 378         return drivers_list;
 379 }
 380
 381 /**
 382  * Initialize a hardware driver.
 383  *
 384  * This usually involves memory allocations and variable initializations
 385  * within the driver, but _not_ scanning for attached devices.
 386  * The API call sr_driver_scan() is used for that.
 387  *
 388  * @param ctx A libsigrok context object allocated by a previous call to
 389  *            sr_init(). Must not be NULL.
 390  * @param driver The driver to initialize. This must be a pointer to one of
 391  *               the entries returned by sr_driver_list(). Must not be NULL.
 392  *
 393  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 394  *         SR_ERR_BUG upon internal errors, or another negative error code
 395  *         upon other errors.
 396  */
 397 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 398 {
 399         int ret;
 400
 401         if (!ctx) {
 402                 sr_err("Invalid libsigrok context, can't initialize.");
 403                 return SR_ERR_ARG;
 404         }
 405
 406         if (!driver) {
 407                 sr_err("Invalid driver, can't initialize.");
 408                 return SR_ERR_ARG;
 409         }
 410
 411         sr_spew("Initializing driver '%s'.", driver->name);
 412         if ((ret = driver->init(ctx)) < 0)
 413                 sr_err("Failed to initialize the driver: %d.", ret);
 414
 415         return ret;
 416 }
 417
 418 /**
 419  * Tell a hardware driver to scan for devices.
 420  *
 421  * In addition to the detection, the devices that are found are also
 422  * initialized automatically. On some devices, this involves a firmware upload,
 423  * or other such measures.
 424  *
 425  * The order in which the system is scanned for devices is not specified. The
 426  * caller should not assume or rely on any specific order.
 427  *
 428  * Before calling sr_driver_scan(), the user must have previously initialized
 429  * the driver by calling sr_driver_init().
 430  *
 431  * @param driver The driver that should scan. This must be a pointer to one of
 432  *               the entries returned by sr_driver_list(). Must not be NULL.
 433  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 434  *                scanner. Can be NULL/empty.
 435  *
 436  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 437  *         found (or errors were encountered). This list must be freed by the
 438  *         caller using g_slist_free(), but without freeing the data pointed
 439  *         to in the list.
 440  */
 441 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 442 {
 443         GSList *l;
 444
 445         if (!driver) {
 446                 sr_err("Invalid driver, can't scan for devices.");
 447                 return NULL;
 448         }
 449
 450         if (!driver->priv) {
 451                 sr_err("Driver not initialized, can't scan for devices.");
 452                 return NULL;
 453         }
 454
 455         l = driver->scan(options);
 456
 457         sr_spew("Scan of '%s' found %d devices.", driver->name,
 458                 g_slist_length(l));
 459
 460         return l;
 461 }
 462
 463 /** @private */
 464 SR_PRIV void sr_hw_cleanup_all(void)
 465 {
 466         int i;
 467         struct sr_dev_driver **drivers;
 468
 469         drivers = sr_driver_list();
 470         for (i = 0; drivers[i]; i++) {
 471                 if (drivers[i]->cleanup)
 472                         drivers[i]->cleanup();
 473         }
 474 }
 475
 476 /** A floating reference can be passed in for data.
 477  * @private */
 478 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 479 {
 480         struct sr_config *src;
 481
 482         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 483                 return NULL;
 484         src->key = key;
 485         src->data = g_variant_ref_sink(data);
 486
 487         return src;
 488 }
 489
 490 /** @private */
 491 SR_PRIV void sr_config_free(struct sr_config *src)
 492 {
 493
 494         if (!src || !src->data) {
 495                 sr_err("%s: invalid data!", __func__);
 496                 return;
 497         }
 498
 499         g_variant_unref(src->data);
 500         g_free(src);
 501
 502 }
 503
 504 /**
 505  * Returns information about the given driver or device instance.
 506  *
 507  * @param driver The sr_dev_driver struct to query.
 508  * @param sdi (optional) If the key is specific to a device, this must
 509  *            contain a pointer to the struct sr_dev_inst to be checked.
 510  *            Otherwise it must be NULL.
 511  * @param probe_group The probe group on the device for which to list the
 512  *                    values, or NULL.
 513  * @param key The configuration key (SR_CONF_*).
 514  * @param data Pointer to a GVariant where the value will be stored. Must
 515  *             not be NULL. The caller is given ownership of the GVariant
 516  *             and must thus decrease the refcount after use. However if
 517  *             this function returns an error code, the field should be
 518  *             considered unused, and should not be unreferenced.
 519  *
 520  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 521  *         may be returned by the driver indicating it doesn't know that key,
 522  *         but this is not to be flagged as an error by the caller; merely
 523  *         as an indication that it's not applicable.
 524  */
 525 SR_API int sr_config_get(const struct sr_dev_driver *driver,
 526                 const struct sr_dev_inst *sdi,
 527                 const struct sr_probe_group *probe_group,
 528                 int key, GVariant **data)
 529 {
 530         int ret;
 531
 532         if (!driver || !data)
 533                 return SR_ERR;
 534
 535         if (!driver->config_get)
 536                 return SR_ERR_ARG;
 537
 538         if ((ret = driver->config_get(key, data, sdi, probe_group)) == SR_OK) {
 539                 /* Got a floating reference from the driver. Sink it here,
 540                  * caller will need to unref when done with it. */
 541                 g_variant_ref_sink(*data);
 542         }
 543
 544         return ret;
 545 }
 546
 547 /**
 548  * Set a configuration key in a device instance.
 549  *
 550  * @param sdi The device instance.
 551  * @param probe_group The probe group on the device for which to list the
 552  *                    values, or NULL.
 553  * @param key The configuration key (SR_CONF_*).
 554  * @param data The new value for the key, as a GVariant with GVariantType
 555  *        appropriate to that key. A floating reference can be passed
 556  *        in; its refcount will be sunk and unreferenced after use.
 557  *
 558  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 559  *         may be returned by the driver indicating it doesn't know that key,
 560  *         but this is not to be flagged as an error by the caller; merely
 561  *         as an indication that it's not applicable.
 562  */
 563 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
 564                 const struct sr_probe_group *probe_group,
 565                 int key, GVariant *data)
 566 {
 567         int ret;
 568
 569         g_variant_ref_sink(data);
 570
 571         if (!sdi || !sdi->driver || !data)
 572                 ret = SR_ERR;
 573         else if (!sdi->driver->config_set)
 574                 ret = SR_ERR_ARG;
 575         else
 576                 ret = sdi->driver->config_set(key, data, sdi, probe_group);
 577
 578         g_variant_unref(data);
 579
 580         return ret;
 581 }
 582
 583 /**
 584  * List all possible values for a configuration key.
 585  *
 586  * @param driver The sr_dev_driver struct to query.
 587  * @param sdi (optional) If the key is specific to a device, this must
 588  *            contain a pointer to the struct sr_dev_inst to be checked.
 589  * @param probe_group The probe group on the device for which to list the
 590  *                    values, or NULL.
 591  * @param key The configuration key (SR_CONF_*).
 592  * @param data A pointer to a GVariant where the list will be stored. The
 593  *             caller is given ownership of the GVariant and must thus
 594  *             unref the GVariant after use. However if this function
 595  *             returns an error code, the field should be considered
 596  *             unused, and should not be unreferenced.
 597  *
 598  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 599  *         may be returned by the driver indicating it doesn't know that key,
 600  *         but this is not to be flagged as an error by the caller; merely
 601  *         as an indication that it's not applicable.
 602  */
 603 SR_API int sr_config_list(const struct sr_dev_driver *driver,
 604                 const struct sr_dev_inst *sdi,
 605                 const struct sr_probe_group *probe_group,
 606                 int key, GVariant **data)
 607 {
 608         int ret;
 609
 610         if (!driver || !data)
 611                 ret = SR_ERR;
 612         else if (!driver->config_list)
 613                 ret = SR_ERR_ARG;
 614         else if ((ret = driver->config_list(key, data, sdi, probe_group)) == SR_OK)
 615                 g_variant_ref_sink(*data);
 616
 617         return ret;
 618 }
 619
 620 /**
 621  * Get information about a configuration key.
 622  *
 623  * @param key The configuration key.
 624  *
 625  * @return A pointer to a struct sr_config_info, or NULL if the key
 626  *         was not found.
 627  */
 628 SR_API const struct sr_config_info *sr_config_info_get(int key)
 629 {
 630         int i;
 631
 632         for (i = 0; sr_config_info_data[i].key; i++) {
 633                 if (sr_config_info_data[i].key == key)
 634                         return &sr_config_info_data[i];
 635         }
 636
 637         return NULL;
 638 }
 639
 640 /**
 641  * Get information about an configuration key, by name.
 642  *
 643  * @param optname The configuration key.
 644  *
 645  * @return A pointer to a struct sr_config_info, or NULL if the key
 646  *         was not found.
 647  */
 648 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 649 {
 650         int i;
 651
 652         for (i = 0; sr_config_info_data[i].key; i++) {
 653                 if (!strcmp(sr_config_info_data[i].id, optname))
 654                         return &sr_config_info_data[i];
 655         }
 656
 657         return NULL;
 658 }
 659
 660 /* Unnecessary level of indirection follows. */
 661
 662 /** @private */
 663 SR_PRIV int sr_source_remove(int fd)
 664 {
 665         return sr_session_source_remove(fd);
 666 }
 667
 668 /** @private */
 669 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 670                           sr_receive_data_callback_t cb, void *cb_data)
 671 {
 672         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 673 }
 674
 675 /** @} */