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