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_RLE, SR_T_BOOL, "rle",
  67                 "Run Length Encoding", NULL},
  68         {SR_CONF_TRIGGER_SLOPE, SR_T_UINT64, "triggerslope",
  69                 "Trigger slope", NULL},
  70         {SR_CONF_TRIGGER_SOURCE, SR_T_CHAR, "triggersource",
  71                 "Trigger source", NULL},
  72         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
  73                 "Horizontal trigger position", NULL},
  74         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
  75                 "Buffer size", NULL},
  76         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
  77                 "Time base", NULL},
  78         {SR_CONF_FILTER, SR_T_CHAR, "filter",
  79                 "Filter targets", NULL},
  80         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
  81                 "Volts/div", NULL},
  82         {SR_CONF_COUPLING, SR_T_CHAR, "coupling",
  83                 "Coupling", NULL},
  84         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
  85                 "Datalog", NULL},
  86         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_CHAR, "spl_weight_freq",
  87                 "Sound pressure level frequency weighting", NULL},
  88         {SR_CONF_SPL_WEIGHT_TIME, SR_T_CHAR, "spl_weight_time",
  89                 "Sound pressure level time weighting", NULL},
  90         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
  91                 "Hold max", NULL},
  92         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
  93                 "Hold min", NULL},
  94         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
  95                 "Sound pressure level measurement range", NULL},
  96         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
  97                 "Power off", NULL},
  98         {SR_CONF_DATA_SOURCE, SR_T_CHAR, "data_source",
  99                 "Data source", NULL},
 100         {0, 0, NULL, NULL, NULL},
 101 };
 102
 103 /** @cond PRIVATE */
 104 #ifdef HAVE_HW_BRYMEN_DMM
 105 extern SR_PRIV struct sr_dev_driver brymen_bm857_driver_info;
 106 #endif
 107 #ifdef HAVE_HW_CEM_DT_885X
 108 extern SR_PRIV struct sr_dev_driver cem_dt_885x_driver_info;
 109 #endif
 110 #ifdef HAVE_HW_COLEAD_SLM
 111 extern SR_PRIV struct sr_dev_driver colead_slm_driver_info;
 112 #endif
 113 #ifdef HAVE_HW_DEMO
 114 extern SR_PRIV struct sr_dev_driver demo_driver_info;
 115 #endif
 116 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 117 extern SR_PRIV struct sr_dev_driver ikalogic_scanalogic2_driver_info;
 118 #endif
 119 #ifdef HAVE_HW_LASCAR_EL_USB
 120 extern SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
 121 #endif
 122 #ifdef HAVE_HW_MIC_985XX
 123 extern SR_PRIV struct sr_dev_driver mic_98581_driver_info;
 124 extern SR_PRIV struct sr_dev_driver mic_98583_driver_info;
 125 #endif
 126 #ifdef HAVE_HW_NEXUS_OSCIPRIME
 127 extern SR_PRIV struct sr_dev_driver nexus_osciprime_driver_info;
 128 #endif
 129 #ifdef HAVE_HW_OLS
 130 extern SR_PRIV struct sr_dev_driver ols_driver_info;
 131 #endif
 132 #ifdef HAVE_HW_RIGOL_DS1XX2
 133 extern SR_PRIV struct sr_dev_driver rigol_ds1xx2_driver_info;
 134 #endif
 135 #ifdef HAVE_HW_TONDAJ_SL_814
 136 extern SR_PRIV struct sr_dev_driver tondaj_sl_814_driver_info;
 137 #endif
 138 #ifdef HAVE_HW_VICTOR_DMM
 139 extern SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
 140 #endif
 141 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 142 extern SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
 143 #endif
 144 #ifdef HAVE_HW_ASIX_SIGMA
 145 extern SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
 146 #endif
 147 #ifdef HAVE_HW_CHRONOVU_LA8
 148 extern SR_PRIV struct sr_dev_driver chronovu_la8_driver_info;
 149 #endif
 150 #ifdef HAVE_HW_LINK_MSO19
 151 extern SR_PRIV struct sr_dev_driver link_mso19_driver_info;
 152 #endif
 153 #ifdef HAVE_HW_ALSA
 154 extern SR_PRIV struct sr_dev_driver alsa_driver_info;
 155 #endif
 156 #ifdef HAVE_HW_FX2LAFW
 157 extern SR_PRIV struct sr_dev_driver fx2lafw_driver_info;
 158 #endif
 159 #ifdef HAVE_HW_HANTEK_DSO
 160 extern SR_PRIV struct sr_dev_driver hantek_dso_driver_info;
 161 #endif
 162 #ifdef HAVE_HW_AGILENT_DMM
 163 extern SR_PRIV struct sr_dev_driver agdmm_driver_info;
 164 #endif
 165 #ifdef HAVE_HW_FLUKE_DMM
 166 extern SR_PRIV struct sr_dev_driver flukedmm_driver_info;
 167 #endif
 168 #ifdef HAVE_HW_SERIAL_DMM
 169 extern SR_PRIV struct sr_dev_driver digitek_dt4000zc_driver_info;
 170 extern SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
 171 extern SR_PRIV struct sr_dev_driver metex_me31_driver_info;
 172 extern SR_PRIV struct sr_dev_driver peaktech_3410_driver_info;
 173 extern SR_PRIV struct sr_dev_driver mastech_mas345_driver_info;
 174 extern SR_PRIV struct sr_dev_driver va_va18b_driver_info;
 175 extern SR_PRIV struct sr_dev_driver metex_m3640d_driver_info;
 176 extern SR_PRIV struct sr_dev_driver peaktech_4370_driver_info;
 177 extern SR_PRIV struct sr_dev_driver pce_pce_dm32_driver_info;
 178 extern SR_PRIV struct sr_dev_driver radioshack_22_168_driver_info;
 179 extern SR_PRIV struct sr_dev_driver radioshack_22_805_driver_info;
 180 extern SR_PRIV struct sr_dev_driver radioshack_22_812_driver_info;
 181 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8060_ser_driver_info;
 182 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_ser_driver_info;
 183 extern SR_PRIV struct sr_dev_driver voltcraft_m3650d_driver_info;
 184 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_ser_driver_info;
 185 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_ser_driver_info;
 186 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_ser_driver_info;
 187 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_ser_driver_info;
 188 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_ser_driver_info;
 189 #endif
 190 #ifdef HAVE_HW_UNI_T_DMM
 191 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8060_driver_info;
 192 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_driver_info;
 193 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
 194 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_driver_info;
 195 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
 196 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 197 #endif
 198 /** @endcond */
 199
 200 static struct sr_dev_driver *drivers_list[] = {
 201 #ifdef HAVE_HW_BRYMEN_DMM
 202         &brymen_bm857_driver_info,
 203 #endif
 204 #ifdef HAVE_HW_CEM_DT_885X
 205         &cem_dt_885x_driver_info,
 206 #endif
 207 #ifdef HAVE_HW_COLEAD_SLM
 208         &colead_slm_driver_info,
 209 #endif
 210 #ifdef HAVE_HW_DEMO
 211         &demo_driver_info,
 212 #endif
 213 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 214         &ikalogic_scanalogic2_driver_info,
 215 #endif
 216 #ifdef HAVE_HW_LASCAR_EL_USB
 217         &lascar_el_usb_driver_info,
 218 #endif
 219 #ifdef HAVE_HW_MIC_985XX
 220         &mic_98581_driver_info,
 221         &mic_98583_driver_info,
 222 #endif
 223 #ifdef HAVE_HW_NEXUS_OSCIPRIME
 224         &nexus_osciprime_driver_info,
 225 #endif
 226 #ifdef HAVE_HW_OLS
 227         &ols_driver_info,
 228 #endif
 229 #ifdef HAVE_HW_RIGOL_DS1XX2
 230         &rigol_ds1xx2_driver_info,
 231 #endif
 232 #ifdef HAVE_HW_TONDAJ_SL_814
 233         &tondaj_sl_814_driver_info,
 234 #endif
 235 #ifdef HAVE_HW_VICTOR_DMM
 236         &victor_dmm_driver_info,
 237 #endif
 238 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 239         &zeroplus_logic_cube_driver_info,
 240 #endif
 241 #ifdef HAVE_HW_ASIX_SIGMA
 242         &asix_sigma_driver_info,
 243 #endif
 244 #ifdef HAVE_HW_CHRONOVU_LA8
 245         &chronovu_la8_driver_info,
 246 #endif
 247 #ifdef HAVE_HW_LINK_MSO19
 248         &link_mso19_driver_info,
 249 #endif
 250 #ifdef HAVE_HW_ALSA
 251         &alsa_driver_info,
 252 #endif
 253 #ifdef HAVE_HW_FX2LAFW
 254         &fx2lafw_driver_info,
 255 #endif
 256 #ifdef HAVE_HW_HANTEK_DSO
 257         &hantek_dso_driver_info,
 258 #endif
 259 #ifdef HAVE_HW_AGILENT_DMM
 260         &agdmm_driver_info,
 261 #endif
 262 #ifdef HAVE_HW_FLUKE_DMM
 263         &flukedmm_driver_info,
 264 #endif
 265 #ifdef HAVE_HW_SERIAL_DMM
 266         &digitek_dt4000zc_driver_info,
 267         &tekpower_tp4000zc_driver_info,
 268         &metex_me31_driver_info,
 269         &peaktech_3410_driver_info,
 270         &mastech_mas345_driver_info,
 271         &va_va18b_driver_info,
 272         &metex_m3640d_driver_info,
 273         &peaktech_4370_driver_info,
 274         &pce_pce_dm32_driver_info,
 275         &radioshack_22_168_driver_info,
 276         &radioshack_22_805_driver_info,
 277         &radioshack_22_812_driver_info,
 278         &tecpel_dmm_8060_ser_driver_info,
 279         &tecpel_dmm_8061_ser_driver_info,
 280         &voltcraft_m3650d_driver_info,
 281         &voltcraft_vc820_ser_driver_info,
 282         &voltcraft_vc830_ser_driver_info,
 283         &voltcraft_vc840_ser_driver_info,
 284         &uni_t_ut61d_ser_driver_info,
 285         &uni_t_ut61e_ser_driver_info,
 286 #endif
 287 #ifdef HAVE_HW_UNI_T_DMM
 288         &tecpel_dmm_8060_driver_info,
 289         &tecpel_dmm_8061_driver_info,
 290         &uni_t_ut61d_driver_info,
 291         &uni_t_ut61e_driver_info,
 292         &voltcraft_vc820_driver_info,
 293         &voltcraft_vc840_driver_info,
 294 #endif
 295         NULL,
 296 };
 297
 298 /**
 299  * Return the list of supported hardware drivers.
 300  *
 301  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 302  */
 303 SR_API struct sr_dev_driver **sr_driver_list(void)
 304 {
 305
 306         return drivers_list;
 307 }
 308
 309 /**
 310  * Initialize a hardware driver.
 311  *
 312  * This usually involves memory allocations and variable initializations
 313  * within the driver, but _not_ scanning for attached devices.
 314  * The API call sr_driver_scan() is used for that.
 315  *
 316  * @param ctx A libsigrok context object allocated by a previous call to
 317  *            sr_init(). Must not be NULL.
 318  * @param driver The driver to initialize. This must be a pointer to one of
 319  *               the entries returned by sr_driver_list(). Must not be NULL.
 320  *
 321  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 322  *         SR_ERR_BUG upon internal errors, or another negative error code
 323  *         upon other errors.
 324  */
 325 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 326 {
 327         int ret;
 328
 329         if (!ctx) {
 330                 sr_err("Invalid libsigrok context, can't initialize.");
 331                 return SR_ERR_ARG;
 332         }
 333
 334         if (!driver) {
 335                 sr_err("Invalid driver, can't initialize.");
 336                 return SR_ERR_ARG;
 337         }
 338
 339         sr_spew("Initializing driver '%s'.", driver->name);
 340         if ((ret = driver->init(ctx)) < 0)
 341                 sr_err("Failed to initialize the driver: %d.", ret);
 342
 343         return ret;
 344 }
 345
 346 /**
 347  * Tell a hardware driver to scan for devices.
 348  *
 349  * In addition to the detection, the devices that are found are also
 350  * initialized automatically. On some devices, this involves a firmware upload,
 351  * or other such measures.
 352  *
 353  * The order in which the system is scanned for devices is not specified. The
 354  * caller should not assume or rely on any specific order.
 355  *
 356  * Before calling sr_driver_scan(), the user must have previously initialized
 357  * the driver by calling sr_driver_init().
 358  *
 359  * @param driver The driver that should scan. This must be a pointer to one of
 360  *               the entries returned by sr_driver_list(). Must not be NULL.
 361  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 362  *                scanner. Can be NULL/empty.
 363  *
 364  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 365  *         found (or errors were encountered). This list must be freed by the
 366  *         caller using g_slist_free(), but without freeing the data pointed
 367  *         to in the list.
 368  */
 369 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 370 {
 371         GSList *l;
 372
 373         if (!driver) {
 374                 sr_err("Invalid driver, can't scan for devices.");
 375                 return NULL;
 376         }
 377
 378         if (!driver->priv) {
 379                 sr_err("Driver not initialized, can't scan for devices.");
 380                 return NULL;
 381         }
 382
 383         l = driver->scan(options);
 384
 385         sr_spew("Scan of '%s' found %d devices.", driver->name,
 386                 g_slist_length(l));
 387
 388         return l;
 389 }
 390
 391 /** @private */
 392 SR_PRIV void sr_hw_cleanup_all(void)
 393 {
 394         int i;
 395         struct sr_dev_driver **drivers;
 396
 397         drivers = sr_driver_list();
 398         for (i = 0; drivers[i]; i++) {
 399                 if (drivers[i]->cleanup)
 400                         drivers[i]->cleanup();
 401         }
 402 }
 403
 404 /** A floating reference can be passed in for data. */
 405 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 406 {
 407         struct sr_config *src;
 408
 409         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 410                 return NULL;
 411         src->key = key;
 412         src->data = g_variant_ref_sink(data);
 413
 414         return src;
 415 }
 416
 417 SR_PRIV void sr_config_free(struct sr_config *src)
 418 {
 419
 420         if (!src || !src->data) {
 421                 sr_err("%s: invalid data!", __func__);
 422                 return;
 423         }
 424
 425         g_variant_unref(src->data);
 426         g_free(src);
 427
 428 }
 429
 430 /**
 431  * Returns information about the given driver or device instance.
 432  *
 433  * @param driver The sr_dev_driver struct to query.
 434  * @param key The configuration key (SR_CONF_*).
 435  * @param data Pointer to a GVariant where the value will be stored. Must
 436  *             not be NULL. The caller is given ownership of the GVariant
 437  *             and must thus decrease the refcount after use. However if
 438  *             this function returns an error code, the field should be
 439  *             considered unused, and should not be unreferenced.
 440  * @param sdi (optional) If the key is specific to a device, this must
 441  *            contain a pointer to the struct sr_dev_inst to be checked.
 442  *            Otherwise it must be NULL.
 443  *
 444  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 445  *         may be returned by the driver indicating it doesn't know that key,
 446  *         but this is not to be flagged as an error by the caller; merely
 447  *         as an indication that it's not applicable.
 448  */
 449 SR_API int sr_config_get(const struct sr_dev_driver *driver, int key,
 450                 GVariant **data, const struct sr_dev_inst *sdi)
 451 {
 452         int ret;
 453
 454         if (!driver || !data)
 455                 return SR_ERR;
 456
 457         if (!driver->config_get)
 458                 return SR_ERR_ARG;
 459
 460         if ((ret = driver->config_get(key, data, sdi)) == SR_OK) {
 461                 /* Got a floating reference from the driver. Sink it here,
 462                  * caller will need to unref when done with it. */
 463                 g_variant_ref_sink(*data);
 464         }
 465
 466         return ret;
 467 }
 468
 469 /**
 470  * Set a configuration key in a device instance.
 471  *
 472  * @param sdi The device instance.
 473  * @param key The configuration key (SR_CONF_*).
 474  * @param data The new value for the key, as a GVariant with GVariantType
 475  *        appropriate to that key. A floating reference can be passed
 476  *        in; its refcount will be sunk and unreferenced after use.
 477  *
 478  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 479  *         may be returned by the driver indicating it doesn't know that key,
 480  *         but this is not to be flagged as an error by the caller; merely
 481  *         as an indication that it's not applicable.
 482  */
 483 SR_API int sr_config_set(const struct sr_dev_inst *sdi, int key, GVariant *data)
 484 {
 485         int ret;
 486
 487         g_variant_ref_sink(data);
 488
 489         if (!sdi || !sdi->driver || !data)
 490                 ret = SR_ERR;
 491         else if (!sdi->driver->config_set)
 492                 ret = SR_ERR_ARG;
 493         else
 494                 ret = sdi->driver->config_set(key, data, sdi);
 495
 496         g_variant_unref(data);
 497
 498         return ret;
 499 }
 500
 501 /**
 502  * List all possible values for a configuration key.
 503  *
 504  * @param driver The sr_dev_driver struct to query.
 505  * @param key The configuration key (SR_CONF_*).
 506  * @param data A pointer to a GVariant where the list will be stored. The
 507  *             caller is given ownership of the GVariant and must thus
 508  *             unref the GVariant after use. However if this function
 509  *             returns an error code, the field should be considered
 510  *             unused, and should not be unreferenced.
 511  * @param sdi (optional) If the key is specific to a device, this must
 512  *            contain a pointer to the struct sr_dev_inst to be checked.
 513  *
 514  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 515  *         may be returned by the driver indicating it doesn't know that key,
 516  *         but this is not to be flagged as an error by the caller; merely
 517  *         as an indication that it's not applicable.
 518  */
 519 SR_API int sr_config_list(const struct sr_dev_driver *driver, int key,
 520                 GVariant **data, const struct sr_dev_inst *sdi)
 521 {
 522         int ret;
 523
 524         if (!driver || !data)
 525                 ret = SR_ERR;
 526         else if (!driver->config_list)
 527                 ret = SR_ERR_ARG;
 528         else if ((ret = driver->config_list(key, data, sdi)) == SR_OK)
 529                 g_variant_ref_sink(*data);
 530
 531         return ret;
 532 }
 533
 534 /**
 535  * Get information about a configuration key.
 536  *
 537  * @param key The configuration key.
 538  *
 539  * @return A pointer to a struct sr_config_info, or NULL if the key
 540  *         was not found.
 541  */
 542 SR_API const struct sr_config_info *sr_config_info_get(int key)
 543 {
 544         int i;
 545
 546         for (i = 0; sr_config_info_data[i].key; i++) {
 547                 if (sr_config_info_data[i].key == key)
 548                         return &sr_config_info_data[i];
 549         }
 550
 551         return NULL;
 552 }
 553
 554 /**
 555  * Get information about an configuration key, by name.
 556  *
 557  * @param optname The configuration key.
 558  *
 559  * @return A pointer to a struct sr_config_info, or NULL if the key
 560  *         was not found.
 561  */
 562 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 563 {
 564         int i;
 565
 566         for (i = 0; sr_config_info_data[i].key; i++) {
 567                 if (!strcmp(sr_config_info_data[i].id, optname))
 568                         return &sr_config_info_data[i];
 569         }
 570
 571         return NULL;
 572 }
 573
 574 /* Unnecessary level of indirection follows. */
 575
 576 /** @private */
 577 SR_PRIV int sr_source_remove(int fd)
 578 {
 579         return sr_session_source_remove(fd);
 580 }
 581
 582 /** @private */
 583 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 584                           sr_receive_data_callback_t cb, void *cb_data)
 585 {
 586         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 587 }
 588
 589 /** @} */