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_vc840_ser_driver_info;
 186 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_ser_driver_info;
 187 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_ser_driver_info;
 188 #endif
 189 #ifdef HAVE_HW_UNI_T_DMM
 190 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8060_driver_info;
 191 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_driver_info;
 192 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
 193 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_driver_info;
 194 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
 195 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 196 #endif
 197 /** @endcond */
 198
 199 static struct sr_dev_driver *drivers_list[] = {
 200 #ifdef HAVE_HW_BRYMEN_DMM
 201         &brymen_bm857_driver_info,
 202 #endif
 203 #ifdef HAVE_HW_CEM_DT_885X
 204         &cem_dt_885x_driver_info,
 205 #endif
 206 #ifdef HAVE_HW_COLEAD_SLM
 207         &colead_slm_driver_info,
 208 #endif
 209 #ifdef HAVE_HW_DEMO
 210         &demo_driver_info,
 211 #endif
 212 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 213         &ikalogic_scanalogic2_driver_info,
 214 #endif
 215 #ifdef HAVE_HW_LASCAR_EL_USB
 216         &lascar_el_usb_driver_info,
 217 #endif
 218 #ifdef HAVE_HW_MIC_985XX
 219         &mic_98581_driver_info,
 220         &mic_98583_driver_info,
 221 #endif
 222 #ifdef HAVE_HW_NEXUS_OSCIPRIME
 223         &nexus_osciprime_driver_info,
 224 #endif
 225 #ifdef HAVE_HW_OLS
 226         &ols_driver_info,
 227 #endif
 228 #ifdef HAVE_HW_RIGOL_DS1XX2
 229         &rigol_ds1xx2_driver_info,
 230 #endif
 231 #ifdef HAVE_HW_TONDAJ_SL_814
 232         &tondaj_sl_814_driver_info,
 233 #endif
 234 #ifdef HAVE_HW_VICTOR_DMM
 235         &victor_dmm_driver_info,
 236 #endif
 237 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 238         &zeroplus_logic_cube_driver_info,
 239 #endif
 240 #ifdef HAVE_HW_ASIX_SIGMA
 241         &asix_sigma_driver_info,
 242 #endif
 243 #ifdef HAVE_HW_CHRONOVU_LA8
 244         &chronovu_la8_driver_info,
 245 #endif
 246 #ifdef HAVE_HW_LINK_MSO19
 247         &link_mso19_driver_info,
 248 #endif
 249 #ifdef HAVE_HW_ALSA
 250         &alsa_driver_info,
 251 #endif
 252 #ifdef HAVE_HW_FX2LAFW
 253         &fx2lafw_driver_info,
 254 #endif
 255 #ifdef HAVE_HW_HANTEK_DSO
 256         &hantek_dso_driver_info,
 257 #endif
 258 #ifdef HAVE_HW_AGILENT_DMM
 259         &agdmm_driver_info,
 260 #endif
 261 #ifdef HAVE_HW_FLUKE_DMM
 262         &flukedmm_driver_info,
 263 #endif
 264 #ifdef HAVE_HW_SERIAL_DMM
 265         &digitek_dt4000zc_driver_info,
 266         &tekpower_tp4000zc_driver_info,
 267         &metex_me31_driver_info,
 268         &peaktech_3410_driver_info,
 269         &mastech_mas345_driver_info,
 270         &va_va18b_driver_info,
 271         &metex_m3640d_driver_info,
 272         &peaktech_4370_driver_info,
 273         &pce_pce_dm32_driver_info,
 274         &radioshack_22_168_driver_info,
 275         &radioshack_22_805_driver_info,
 276         &radioshack_22_812_driver_info,
 277         &tecpel_dmm_8060_ser_driver_info,
 278         &tecpel_dmm_8061_ser_driver_info,
 279         &voltcraft_m3650d_driver_info,
 280         &voltcraft_vc820_ser_driver_info,
 281         &voltcraft_vc840_ser_driver_info,
 282         &uni_t_ut61d_ser_driver_info,
 283         &uni_t_ut61e_ser_driver_info,
 284 #endif
 285 #ifdef HAVE_HW_UNI_T_DMM
 286         &tecpel_dmm_8060_driver_info,
 287         &tecpel_dmm_8061_driver_info,
 288         &uni_t_ut61d_driver_info,
 289         &uni_t_ut61e_driver_info,
 290         &voltcraft_vc820_driver_info,
 291         &voltcraft_vc840_driver_info,
 292 #endif
 293         NULL,
 294 };
 295
 296 /**
 297  * Return the list of supported hardware drivers.
 298  *
 299  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 300  */
 301 SR_API struct sr_dev_driver **sr_driver_list(void)
 302 {
 303
 304         return drivers_list;
 305 }
 306
 307 /**
 308  * Initialize a hardware driver.
 309  *
 310  * This usually involves memory allocations and variable initializations
 311  * within the driver, but _not_ scanning for attached devices.
 312  * The API call sr_driver_scan() is used for that.
 313  *
 314  * @param ctx A libsigrok context object allocated by a previous call to
 315  *            sr_init(). Must not be NULL.
 316  * @param driver The driver to initialize. This must be a pointer to one of
 317  *               the entries returned by sr_driver_list(). Must not be NULL.
 318  *
 319  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 320  *         SR_ERR_BUG upon internal errors, or another negative error code
 321  *         upon other errors.
 322  */
 323 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 324 {
 325         int ret;
 326
 327         if (!ctx) {
 328                 sr_err("Invalid libsigrok context, can't initialize.");
 329                 return SR_ERR_ARG;
 330         }
 331
 332         if (!driver) {
 333                 sr_err("Invalid driver, can't initialize.");
 334                 return SR_ERR_ARG;
 335         }
 336
 337         sr_spew("Initializing driver '%s'.", driver->name);
 338         if ((ret = driver->init(ctx)) < 0)
 339                 sr_err("Failed to initialize the driver: %d.", ret);
 340
 341         return ret;
 342 }
 343
 344 /**
 345  * Tell a hardware driver to scan for devices.
 346  *
 347  * In addition to the detection, the devices that are found are also
 348  * initialized automatically. On some devices, this involves a firmware upload,
 349  * or other such measures.
 350  *
 351  * The order in which the system is scanned for devices is not specified. The
 352  * caller should not assume or rely on any specific order.
 353  *
 354  * Before calling sr_driver_scan(), the user must have previously initialized
 355  * the driver by calling sr_driver_init().
 356  *
 357  * @param driver The driver that should scan. This must be a pointer to one of
 358  *               the entries returned by sr_driver_list(). Must not be NULL.
 359  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 360  *                scanner. Can be NULL/empty.
 361  *
 362  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 363  *         found (or errors were encountered). This list must be freed by the
 364  *         caller using g_slist_free(), but without freeing the data pointed
 365  *         to in the list.
 366  */
 367 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 368 {
 369         GSList *l;
 370
 371         if (!driver) {
 372                 sr_err("Invalid driver, can't scan for devices.");
 373                 return NULL;
 374         }
 375
 376         if (!driver->priv) {
 377                 sr_err("Driver not initialized, can't scan for devices.");
 378                 return NULL;
 379         }
 380
 381         l = driver->scan(options);
 382
 383         sr_spew("Scan of '%s' found %d devices.", driver->name,
 384                 g_slist_length(l));
 385
 386         return l;
 387 }
 388
 389 /** @private */
 390 SR_PRIV void sr_hw_cleanup_all(void)
 391 {
 392         int i;
 393         struct sr_dev_driver **drivers;
 394
 395         drivers = sr_driver_list();
 396         for (i = 0; drivers[i]; i++) {
 397                 if (drivers[i]->cleanup)
 398                         drivers[i]->cleanup();
 399         }
 400 }
 401
 402 /** A floating reference can be passed in for data. */
 403 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 404 {
 405         struct sr_config *src;
 406
 407         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 408                 return NULL;
 409         src->key = key;
 410         src->data = g_variant_ref_sink(data);
 411
 412         return src;
 413 }
 414
 415 SR_PRIV void sr_config_free(struct sr_config *src)
 416 {
 417
 418         if (!src || !src->data) {
 419                 sr_err("%s: invalid data!", __func__);
 420                 return;
 421         }
 422
 423         g_variant_unref(src->data);
 424         g_free(src);
 425
 426 }
 427
 428 /**
 429  * Returns information about the given driver or device instance.
 430  *
 431  * @param driver The sr_dev_driver struct to query.
 432  * @param key The configuration key (SR_CONF_*).
 433  * @param data Pointer to a GVariant where the value will be stored. Must
 434  *             not be NULL. The caller is given ownership of the GVariant
 435  *             and must thus decrease the refcount after use. However if
 436  *             this function returns an error code, the field should be
 437  *             considered unused, and should not be unreferenced.
 438  * @param sdi (optional) If the key is specific to a device, this must
 439  *            contain a pointer to the struct sr_dev_inst to be checked.
 440  *            Otherwise it must be NULL.
 441  *
 442  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 443  *         may be returned by the driver indicating it doesn't know that key,
 444  *         but this is not to be flagged as an error by the caller; merely
 445  *         as an indication that it's not applicable.
 446  */
 447 SR_API int sr_config_get(const struct sr_dev_driver *driver, int key,
 448                 GVariant **data, const struct sr_dev_inst *sdi)
 449 {
 450         int ret;
 451
 452         if (!driver || !data)
 453                 return SR_ERR;
 454
 455         if (!driver->config_get)
 456                 return SR_ERR_ARG;
 457
 458         if ((ret = driver->config_get(key, data, sdi)) == SR_OK) {
 459                 /* Got a floating reference from the driver. Sink it here,
 460                  * caller will need to unref when done with it. */
 461                 g_variant_ref_sink(*data);
 462         }
 463
 464         return ret;
 465 }
 466
 467 /**
 468  * Set a configuration key in a device instance.
 469  *
 470  * @param sdi The device instance.
 471  * @param key The configuration key (SR_CONF_*).
 472  * @param data The new value for the key, as a GVariant with GVariantType
 473  *        appropriate to that key. A floating reference can be passed
 474  *        in; its refcount will be sunk and unreferenced after use.
 475  *
 476  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 477  *         may be returned by the driver indicating it doesn't know that key,
 478  *         but this is not to be flagged as an error by the caller; merely
 479  *         as an indication that it's not applicable.
 480  */
 481 SR_API int sr_config_set(const struct sr_dev_inst *sdi, int key, GVariant *data)
 482 {
 483         int ret;
 484
 485         g_variant_ref_sink(data);
 486
 487         if (!sdi || !sdi->driver || !data)
 488                 ret = SR_ERR;
 489         else if (!sdi->driver->config_set)
 490                 ret = SR_ERR_ARG;
 491         else
 492                 ret = sdi->driver->config_set(key, data, sdi);
 493
 494         g_variant_unref(data);
 495
 496         return ret;
 497 }
 498
 499 /**
 500  * List all possible values for a configuration key.
 501  *
 502  * @param driver The sr_dev_driver struct to query.
 503  * @param key The configuration key (SR_CONF_*).
 504  * @param data A pointer to a GVariant where the list will be stored. The
 505  *             caller is given ownership of the GVariant and must thus
 506  *             unref the GVariant after use. However if this function
 507  *             returns an error code, the field should be considered
 508  *             unused, and should not be unreferenced.
 509  * @param sdi (optional) If the key is specific to a device, this must
 510  *            contain a pointer to the struct sr_dev_inst to be checked.
 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_list(const struct sr_dev_driver *driver, int key,
 518                 GVariant **data, const struct sr_dev_inst *sdi)
 519 {
 520         int ret;
 521
 522         if (!driver || !data)
 523                 ret = SR_ERR;
 524         else if (!driver->config_list)
 525                 ret = SR_ERR_ARG;
 526         else if ((ret = driver->config_list(key, data, sdi)) == SR_OK)
 527                 g_variant_ref_sink(*data);
 528
 529         return ret;
 530 }
 531
 532 /**
 533  * Get information about a configuration key.
 534  *
 535  * @param key The configuration key.
 536  *
 537  * @return A pointer to a struct sr_config_info, or NULL if the key
 538  *         was not found.
 539  */
 540 SR_API const struct sr_config_info *sr_config_info_get(int key)
 541 {
 542         int i;
 543
 544         for (i = 0; sr_config_info_data[i].key; i++) {
 545                 if (sr_config_info_data[i].key == key)
 546                         return &sr_config_info_data[i];
 547         }
 548
 549         return NULL;
 550 }
 551
 552 /**
 553  * Get information about an configuration key, by name.
 554  *
 555  * @param optname The configuration key.
 556  *
 557  * @return A pointer to a struct sr_config_info, or NULL if the key
 558  *         was not found.
 559  */
 560 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 561 {
 562         int i;
 563
 564         for (i = 0; sr_config_info_data[i].key; i++) {
 565                 if (!strcmp(sr_config_info_data[i].id, optname))
 566                         return &sr_config_info_data[i];
 567         }
 568
 569         return NULL;
 570 }
 571
 572 /* Unnecessary level of indirection follows. */
 573
 574 /** @private */
 575 SR_PRIV int sr_source_remove(int fd)
 576 {
 577         return sr_session_source_remove(fd);
 578 }
 579
 580 /** @private */
 581 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 582                           sr_receive_data_callback_t cb, void *cb_data)
 583 {
 584         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 585 }
 586
 587 /** @} */