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_vc830_driver_info;
 197 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 198 #endif
 199 /** @endcond */
 200
 201 static struct sr_dev_driver *drivers_list[] = {
 202 #ifdef HAVE_HW_BRYMEN_DMM
 203         &brymen_bm857_driver_info,
 204 #endif
 205 #ifdef HAVE_HW_CEM_DT_885X
 206         &cem_dt_885x_driver_info,
 207 #endif
 208 #ifdef HAVE_HW_COLEAD_SLM
 209         &colead_slm_driver_info,
 210 #endif
 211 #ifdef HAVE_HW_DEMO
 212         &demo_driver_info,
 213 #endif
 214 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 215         &ikalogic_scanalogic2_driver_info,
 216 #endif
 217 #ifdef HAVE_HW_LASCAR_EL_USB
 218         &lascar_el_usb_driver_info,
 219 #endif
 220 #ifdef HAVE_HW_MIC_985XX
 221         &mic_98581_driver_info,
 222         &mic_98583_driver_info,
 223 #endif
 224 #ifdef HAVE_HW_NEXUS_OSCIPRIME
 225         &nexus_osciprime_driver_info,
 226 #endif
 227 #ifdef HAVE_HW_OLS
 228         &ols_driver_info,
 229 #endif
 230 #ifdef HAVE_HW_RIGOL_DS1XX2
 231         &rigol_ds1xx2_driver_info,
 232 #endif
 233 #ifdef HAVE_HW_TONDAJ_SL_814
 234         &tondaj_sl_814_driver_info,
 235 #endif
 236 #ifdef HAVE_HW_VICTOR_DMM
 237         &victor_dmm_driver_info,
 238 #endif
 239 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 240         &zeroplus_logic_cube_driver_info,
 241 #endif
 242 #ifdef HAVE_HW_ASIX_SIGMA
 243         &asix_sigma_driver_info,
 244 #endif
 245 #ifdef HAVE_HW_CHRONOVU_LA8
 246         &chronovu_la8_driver_info,
 247 #endif
 248 #ifdef HAVE_HW_LINK_MSO19
 249         &link_mso19_driver_info,
 250 #endif
 251 #ifdef HAVE_HW_ALSA
 252         &alsa_driver_info,
 253 #endif
 254 #ifdef HAVE_HW_FX2LAFW
 255         &fx2lafw_driver_info,
 256 #endif
 257 #ifdef HAVE_HW_HANTEK_DSO
 258         &hantek_dso_driver_info,
 259 #endif
 260 #ifdef HAVE_HW_AGILENT_DMM
 261         &agdmm_driver_info,
 262 #endif
 263 #ifdef HAVE_HW_FLUKE_DMM
 264         &flukedmm_driver_info,
 265 #endif
 266 #ifdef HAVE_HW_SERIAL_DMM
 267         &digitek_dt4000zc_driver_info,
 268         &tekpower_tp4000zc_driver_info,
 269         &metex_me31_driver_info,
 270         &peaktech_3410_driver_info,
 271         &mastech_mas345_driver_info,
 272         &va_va18b_driver_info,
 273         &metex_m3640d_driver_info,
 274         &peaktech_4370_driver_info,
 275         &pce_pce_dm32_driver_info,
 276         &radioshack_22_168_driver_info,
 277         &radioshack_22_805_driver_info,
 278         &radioshack_22_812_driver_info,
 279         &tecpel_dmm_8060_ser_driver_info,
 280         &tecpel_dmm_8061_ser_driver_info,
 281         &voltcraft_m3650d_driver_info,
 282         &voltcraft_vc820_ser_driver_info,
 283         &voltcraft_vc830_ser_driver_info,
 284         &voltcraft_vc840_ser_driver_info,
 285         &uni_t_ut61d_ser_driver_info,
 286         &uni_t_ut61e_ser_driver_info,
 287 #endif
 288 #ifdef HAVE_HW_UNI_T_DMM
 289         &tecpel_dmm_8060_driver_info,
 290         &tecpel_dmm_8061_driver_info,
 291         &uni_t_ut61d_driver_info,
 292         &uni_t_ut61e_driver_info,
 293         &voltcraft_vc820_driver_info,
 294         &voltcraft_vc830_driver_info,
 295         &voltcraft_vc840_driver_info,
 296 #endif
 297         NULL,
 298 };
 299
 300 /**
 301  * Return the list of supported hardware drivers.
 302  *
 303  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 304  */
 305 SR_API struct sr_dev_driver **sr_driver_list(void)
 306 {
 307
 308         return drivers_list;
 309 }
 310
 311 /**
 312  * Initialize a hardware driver.
 313  *
 314  * This usually involves memory allocations and variable initializations
 315  * within the driver, but _not_ scanning for attached devices.
 316  * The API call sr_driver_scan() is used for that.
 317  *
 318  * @param ctx A libsigrok context object allocated by a previous call to
 319  *            sr_init(). Must not be NULL.
 320  * @param driver The driver to initialize. This must be a pointer to one of
 321  *               the entries returned by sr_driver_list(). Must not be NULL.
 322  *
 323  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 324  *         SR_ERR_BUG upon internal errors, or another negative error code
 325  *         upon other errors.
 326  */
 327 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 328 {
 329         int ret;
 330
 331         if (!ctx) {
 332                 sr_err("Invalid libsigrok context, can't initialize.");
 333                 return SR_ERR_ARG;
 334         }
 335
 336         if (!driver) {
 337                 sr_err("Invalid driver, can't initialize.");
 338                 return SR_ERR_ARG;
 339         }
 340
 341         sr_spew("Initializing driver '%s'.", driver->name);
 342         if ((ret = driver->init(ctx)) < 0)
 343                 sr_err("Failed to initialize the driver: %d.", ret);
 344
 345         return ret;
 346 }
 347
 348 /**
 349  * Tell a hardware driver to scan for devices.
 350  *
 351  * In addition to the detection, the devices that are found are also
 352  * initialized automatically. On some devices, this involves a firmware upload,
 353  * or other such measures.
 354  *
 355  * The order in which the system is scanned for devices is not specified. The
 356  * caller should not assume or rely on any specific order.
 357  *
 358  * Before calling sr_driver_scan(), the user must have previously initialized
 359  * the driver by calling sr_driver_init().
 360  *
 361  * @param driver The driver that should scan. This must be a pointer to one of
 362  *               the entries returned by sr_driver_list(). Must not be NULL.
 363  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 364  *                scanner. Can be NULL/empty.
 365  *
 366  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 367  *         found (or errors were encountered). This list must be freed by the
 368  *         caller using g_slist_free(), but without freeing the data pointed
 369  *         to in the list.
 370  */
 371 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 372 {
 373         GSList *l;
 374
 375         if (!driver) {
 376                 sr_err("Invalid driver, can't scan for devices.");
 377                 return NULL;
 378         }
 379
 380         if (!driver->priv) {
 381                 sr_err("Driver not initialized, can't scan for devices.");
 382                 return NULL;
 383         }
 384
 385         l = driver->scan(options);
 386
 387         sr_spew("Scan of '%s' found %d devices.", driver->name,
 388                 g_slist_length(l));
 389
 390         return l;
 391 }
 392
 393 /** @private */
 394 SR_PRIV void sr_hw_cleanup_all(void)
 395 {
 396         int i;
 397         struct sr_dev_driver **drivers;
 398
 399         drivers = sr_driver_list();
 400         for (i = 0; drivers[i]; i++) {
 401                 if (drivers[i]->cleanup)
 402                         drivers[i]->cleanup();
 403         }
 404 }
 405
 406 /** A floating reference can be passed in for data. */
 407 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 408 {
 409         struct sr_config *src;
 410
 411         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 412                 return NULL;
 413         src->key = key;
 414         src->data = g_variant_ref_sink(data);
 415
 416         return src;
 417 }
 418
 419 SR_PRIV void sr_config_free(struct sr_config *src)
 420 {
 421
 422         if (!src || !src->data) {
 423                 sr_err("%s: invalid data!", __func__);
 424                 return;
 425         }
 426
 427         g_variant_unref(src->data);
 428         g_free(src);
 429
 430 }
 431
 432 /**
 433  * Returns information about the given driver or device instance.
 434  *
 435  * @param driver The sr_dev_driver struct to query.
 436  * @param key The configuration key (SR_CONF_*).
 437  * @param data Pointer to a GVariant where the value will be stored. Must
 438  *             not be NULL. The caller is given ownership of the GVariant
 439  *             and must thus decrease the refcount after use. However if
 440  *             this function returns an error code, the field should be
 441  *             considered unused, and should not be unreferenced.
 442  * @param sdi (optional) If the key is specific to a device, this must
 443  *            contain a pointer to the struct sr_dev_inst to be checked.
 444  *            Otherwise it must be NULL.
 445  *
 446  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 447  *         may be returned by the driver indicating it doesn't know that key,
 448  *         but this is not to be flagged as an error by the caller; merely
 449  *         as an indication that it's not applicable.
 450  */
 451 SR_API int sr_config_get(const struct sr_dev_driver *driver, int key,
 452                 GVariant **data, const struct sr_dev_inst *sdi)
 453 {
 454         int ret;
 455
 456         if (!driver || !data)
 457                 return SR_ERR;
 458
 459         if (!driver->config_get)
 460                 return SR_ERR_ARG;
 461
 462         if ((ret = driver->config_get(key, data, sdi)) == SR_OK) {
 463                 /* Got a floating reference from the driver. Sink it here,
 464                  * caller will need to unref when done with it. */
 465                 g_variant_ref_sink(*data);
 466         }
 467
 468         return ret;
 469 }
 470
 471 /**
 472  * Set a configuration key in a device instance.
 473  *
 474  * @param sdi The device instance.
 475  * @param key The configuration key (SR_CONF_*).
 476  * @param data The new value for the key, as a GVariant with GVariantType
 477  *        appropriate to that key. A floating reference can be passed
 478  *        in; its refcount will be sunk and unreferenced after use.
 479  *
 480  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 481  *         may be returned by the driver indicating it doesn't know that key,
 482  *         but this is not to be flagged as an error by the caller; merely
 483  *         as an indication that it's not applicable.
 484  */
 485 SR_API int sr_config_set(const struct sr_dev_inst *sdi, int key, GVariant *data)
 486 {
 487         int ret;
 488
 489         g_variant_ref_sink(data);
 490
 491         if (!sdi || !sdi->driver || !data)
 492                 ret = SR_ERR;
 493         else if (!sdi->driver->config_set)
 494                 ret = SR_ERR_ARG;
 495         else
 496                 ret = sdi->driver->config_set(key, data, sdi);
 497
 498         g_variant_unref(data);
 499
 500         return ret;
 501 }
 502
 503 /**
 504  * List all possible values for a configuration key.
 505  *
 506  * @param driver The sr_dev_driver struct to query.
 507  * @param key The configuration key (SR_CONF_*).
 508  * @param data A pointer to a GVariant where the list will be stored. The
 509  *             caller is given ownership of the GVariant and must thus
 510  *             unref the GVariant after use. However if this function
 511  *             returns an error code, the field should be considered
 512  *             unused, and should not be unreferenced.
 513  * @param sdi (optional) If the key is specific to a device, this must
 514  *            contain a pointer to the struct sr_dev_inst to be checked.
 515  *
 516  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 517  *         may be returned by the driver indicating it doesn't know that key,
 518  *         but this is not to be flagged as an error by the caller; merely
 519  *         as an indication that it's not applicable.
 520  */
 521 SR_API int sr_config_list(const struct sr_dev_driver *driver, int key,
 522                 GVariant **data, const struct sr_dev_inst *sdi)
 523 {
 524         int ret;
 525
 526         if (!driver || !data)
 527                 ret = SR_ERR;
 528         else if (!driver->config_list)
 529                 ret = SR_ERR_ARG;
 530         else if ((ret = driver->config_list(key, data, sdi)) == SR_OK)
 531                 g_variant_ref_sink(*data);
 532
 533         return ret;
 534 }
 535
 536 /**
 537  * Get information about a configuration key.
 538  *
 539  * @param key The configuration key.
 540  *
 541  * @return A pointer to a struct sr_config_info, or NULL if the key
 542  *         was not found.
 543  */
 544 SR_API const struct sr_config_info *sr_config_info_get(int key)
 545 {
 546         int i;
 547
 548         for (i = 0; sr_config_info_data[i].key; i++) {
 549                 if (sr_config_info_data[i].key == key)
 550                         return &sr_config_info_data[i];
 551         }
 552
 553         return NULL;
 554 }
 555
 556 /**
 557  * Get information about an configuration key, by name.
 558  *
 559  * @param optname The configuration key.
 560  *
 561  * @return A pointer to a struct sr_config_info, or NULL if the key
 562  *         was not found.
 563  */
 564 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 565 {
 566         int i;
 567
 568         for (i = 0; sr_config_info_data[i].key; i++) {
 569                 if (!strcmp(sr_config_info_data[i].id, optname))
 570                         return &sr_config_info_data[i];
 571         }
 572
 573         return NULL;
 574 }
 575
 576 /* Unnecessary level of indirection follows. */
 577
 578 /** @private */
 579 SR_PRIV int sr_source_remove(int fd)
 580 {
 581         return sr_session_source_remove(fd);
 582 }
 583
 584 /** @private */
 585 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 586                           sr_receive_data_callback_t cb, void *cb_data)
 587 {
 588         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 589 }
 590
 591 /** @} */