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 #define LOG_PREFIX "hwdriver"
  31
  32 /**
  33  * @file
  34  *
  35  * Hardware driver handling in libsigrok.
  36  */
  37
  38 /**
  39  * @defgroup grp_driver Hardware drivers
  40  *
  41  * Hardware driver handling in libsigrok.
  42  *
  43  * @{
  44  */
  45
  46 static struct sr_config_info sr_config_info_data[] = {
  47         {SR_CONF_CONN, SR_T_CHAR, "conn",
  48                 "Connection", NULL},
  49         {SR_CONF_SERIALCOMM, SR_T_CHAR, "serialcomm",
  50                 "Serial communication", NULL},
  51         {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
  52                 "Sample rate", NULL},
  53         {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
  54                 "Pre-trigger capture ratio", NULL},
  55         {SR_CONF_PATTERN_MODE, SR_T_CHAR, "pattern",
  56                 "Pattern generator mode", NULL},
  57         {SR_CONF_TRIGGER_TYPE, SR_T_CHAR, "triggertype",
  58                 "Trigger types", NULL},
  59         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
  60                 "External clock mode", NULL},
  61         {SR_CONF_SWAP, SR_T_BOOL, "swap",
  62                 "Swap channel order", NULL},
  63         {SR_CONF_RLE, SR_T_BOOL, "rle",
  64                 "Run Length Encoding", NULL},
  65         {SR_CONF_TRIGGER_SLOPE, SR_T_UINT64, "triggerslope",
  66                 "Trigger slope", NULL},
  67         {SR_CONF_TRIGGER_SOURCE, SR_T_CHAR, "triggersource",
  68                 "Trigger source", NULL},
  69         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
  70                 "Horizontal trigger position", NULL},
  71         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
  72                 "Buffer size", NULL},
  73         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
  74                 "Time base", NULL},
  75         {SR_CONF_FILTER, SR_T_CHAR, "filter",
  76                 "Filter targets", NULL},
  77         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
  78                 "Volts/div", NULL},
  79         {SR_CONF_COUPLING, SR_T_CHAR, "coupling",
  80                 "Coupling", NULL},
  81         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
  82                 "Datalog", NULL},
  83         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_CHAR, "spl_weight_freq",
  84                 "Sound pressure level frequency weighting", NULL},
  85         {SR_CONF_SPL_WEIGHT_TIME, SR_T_CHAR, "spl_weight_time",
  86                 "Sound pressure level time weighting", NULL},
  87         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
  88                 "Hold max", NULL},
  89         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
  90                 "Hold min", NULL},
  91         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
  92                 "Sound pressure level measurement range", NULL},
  93         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
  94                 "Voltage threshold", NULL },
  95         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
  96                 "Power off", NULL},
  97         {SR_CONF_DATA_SOURCE, SR_T_CHAR, "data_source",
  98                 "Data source", NULL},
  99         {SR_CONF_NUM_LOGIC_PROBES, SR_T_INT32, "logic_probes",
 100                 "Number of logic probes", NULL},
 101         {SR_CONF_NUM_ANALOG_PROBES, SR_T_INT32, "analog_probes",
 102                 "Number of analog probes", NULL},
 103         {0, 0, NULL, NULL, NULL},
 104 };
 105
 106 /** @cond PRIVATE */
 107 #ifdef HAVE_HW_APPA_55II
 108 extern SR_PRIV struct sr_dev_driver appa_55ii_driver_info;
 109 #endif
 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_ut61b_ser_driver_info;
 223 extern SR_PRIV struct sr_dev_driver uni_t_ut61c_ser_driver_info;
 224 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_ser_driver_info;
 225 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_ser_driver_info;
 226 extern SR_PRIV struct sr_dev_driver iso_tech_idm103n_driver_info;
 227 #endif
 228 #ifdef HAVE_HW_UNI_T_DMM
 229 extern SR_PRIV struct sr_dev_driver tecpel_dmm_8061_driver_info;
 230 extern SR_PRIV struct sr_dev_driver uni_t_ut60a_driver_info;
 231 extern SR_PRIV struct sr_dev_driver uni_t_ut60e_driver_info;
 232 extern SR_PRIV struct sr_dev_driver uni_t_ut61b_driver_info;
 233 extern SR_PRIV struct sr_dev_driver uni_t_ut61c_driver_info;
 234 extern SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
 235 extern SR_PRIV struct sr_dev_driver uni_t_ut61e_driver_info;
 236 extern SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
 237 extern SR_PRIV struct sr_dev_driver voltcraft_vc830_driver_info;
 238 extern SR_PRIV struct sr_dev_driver voltcraft_vc840_driver_info;
 239 extern SR_PRIV struct sr_dev_driver tenma_72_7745_driver_info;
 240 #endif
 241 /** @endcond */
 242
 243 static struct sr_dev_driver *drivers_list[] = {
 244 #ifdef HAVE_HW_APPA_55II
 245         &appa_55ii_driver_info,
 246 #endif
 247 #ifdef HAVE_HW_BRYMEN_DMM
 248         &brymen_bm857_driver_info,
 249 #endif
 250 #ifdef HAVE_HW_CEM_DT_885X
 251         &cem_dt_885x_driver_info,
 252 #endif
 253 #ifdef HAVE_HW_CENTER_3XX
 254         &center_309_driver_info,
 255         &voltcraft_k204_driver_info,
 256 #endif
 257 #ifdef HAVE_HW_COLEAD_SLM
 258         &colead_slm_driver_info,
 259 #endif
 260 #ifdef HAVE_HW_DEMO
 261         &demo_driver_info,
 262 #endif
 263 #ifdef HAVE_HW_GMC_MH_1X_2X
 264         &gmc_mh_1x_2x_rs232_driver_info,
 265 #endif
 266 #ifdef HAVE_HW_HAMEG_HMO
 267         &hameg_hmo_driver_info,
 268 #endif
 269 #ifdef HAVE_HW_IKALOGIC_SCANALOGIC2
 270         &ikalogic_scanalogic2_driver_info,
 271 #endif
 272 #ifdef HAVE_HW_IKALOGIC_SCANAPLUS
 273         &ikalogic_scanaplus_driver_info,
 274 #endif
 275 #ifdef HAVE_HW_KECHENG_KC_330B
 276         &kecheng_kc_330b_driver_info,
 277 #endif
 278 #ifdef HAVE_HW_LASCAR_EL_USB
 279         &lascar_el_usb_driver_info,
 280 #endif
 281 #ifdef HAVE_HW_MIC_985XX
 282         &mic_98581_driver_info,
 283         &mic_98583_driver_info,
 284 #endif
 285 #ifdef HAVE_HW_NORMA_DMM
 286         &norma_dmm_driver_info,
 287 #endif
 288 #ifdef HAVE_HW_OLS
 289         &ols_driver_info,
 290 #endif
 291 #ifdef HAVE_HW_RIGOL_DS
 292         &rigol_ds_driver_info,
 293 #endif
 294 #ifdef HAVE_HW_SALEAE_LOGIC16
 295         &saleae_logic16_driver_info,
 296 #endif
 297 #ifdef HAVE_HW_TELEINFO
 298         &teleinfo_driver_info,
 299 #endif
 300 #ifdef HAVE_HW_TONDAJ_SL_814
 301         &tondaj_sl_814_driver_info,
 302 #endif
 303 #ifdef HAVE_HW_UNI_T_UT32X
 304         &uni_t_ut32x_driver_info,
 305 #endif
 306 #ifdef HAVE_HW_VICTOR_DMM
 307         &victor_dmm_driver_info,
 308 #endif
 309 #ifdef HAVE_HW_ZEROPLUS_LOGIC_CUBE
 310         &zeroplus_logic_cube_driver_info,
 311 #endif
 312 #ifdef HAVE_HW_ASIX_SIGMA
 313         &asix_sigma_driver_info,
 314 #endif
 315 #ifdef HAVE_HW_CHRONOVU_LA8
 316         &chronovu_la8_driver_info,
 317 #endif
 318 #ifdef HAVE_HW_LINK_MSO19
 319         &link_mso19_driver_info,
 320 #endif
 321 #ifdef HAVE_HW_ALSA
 322         &alsa_driver_info,
 323 #endif
 324 #ifdef HAVE_HW_FX2LAFW
 325         &fx2lafw_driver_info,
 326 #endif
 327 #ifdef HAVE_HW_HANTEK_DSO
 328         &hantek_dso_driver_info,
 329 #endif
 330 #ifdef HAVE_HW_AGILENT_DMM
 331         &agdmm_driver_info,
 332 #endif
 333 #ifdef HAVE_HW_FLUKE_DMM
 334         &flukedmm_driver_info,
 335 #endif
 336 #ifdef HAVE_HW_SERIAL_DMM
 337         &bbcgm_m2110_driver_info,
 338         &digitek_dt4000zc_driver_info,
 339         &tekpower_tp4000zc_driver_info,
 340         &metex_me31_driver_info,
 341         &peaktech_3410_driver_info,
 342         &mastech_mas345_driver_info,
 343         &va_va18b_driver_info,
 344         &metex_m3640d_driver_info,
 345         &metex_m4650cr_driver_info,
 346         &peaktech_4370_driver_info,
 347         &pce_pce_dm32_driver_info,
 348         &radioshack_22_168_driver_info,
 349         &radioshack_22_805_driver_info,
 350         &radioshack_22_812_driver_info,
 351         &tecpel_dmm_8061_ser_driver_info,
 352         &voltcraft_m3650d_driver_info,
 353         &voltcraft_m4650cr_driver_info,
 354         &voltcraft_vc820_ser_driver_info,
 355         &voltcraft_vc830_ser_driver_info,
 356         &voltcraft_vc840_ser_driver_info,
 357         &uni_t_ut60a_ser_driver_info,
 358         &uni_t_ut60e_ser_driver_info,
 359         &uni_t_ut61b_ser_driver_info,
 360         &uni_t_ut61c_ser_driver_info,
 361         &uni_t_ut61d_ser_driver_info,
 362         &uni_t_ut61e_ser_driver_info,
 363         &iso_tech_idm103n_driver_info,
 364 #endif
 365 #ifdef HAVE_HW_UNI_T_DMM
 366         &tecpel_dmm_8061_driver_info,
 367         &uni_t_ut60a_driver_info,
 368         &uni_t_ut60e_driver_info,
 369         &uni_t_ut61b_driver_info,
 370         &uni_t_ut61c_driver_info,
 371         &uni_t_ut61d_driver_info,
 372         &uni_t_ut61e_driver_info,
 373         &voltcraft_vc820_driver_info,
 374         &voltcraft_vc830_driver_info,
 375         &voltcraft_vc840_driver_info,
 376         &tenma_72_7745_driver_info,
 377 #endif
 378         NULL,
 379 };
 380
 381 /**
 382  * Return the list of supported hardware drivers.
 383  *
 384  * @return Pointer to the NULL-terminated list of hardware driver pointers.
 385  */
 386 SR_API struct sr_dev_driver **sr_driver_list(void)
 387 {
 388
 389         return drivers_list;
 390 }
 391
 392 /**
 393  * Initialize a hardware driver.
 394  *
 395  * This usually involves memory allocations and variable initializations
 396  * within the driver, but _not_ scanning for attached devices.
 397  * The API call sr_driver_scan() is used for that.
 398  *
 399  * @param ctx A libsigrok context object allocated by a previous call to
 400  *            sr_init(). Must not be NULL.
 401  * @param driver The driver to initialize. This must be a pointer to one of
 402  *               the entries returned by sr_driver_list(). Must not be NULL.
 403  *
 404  * @return SR_OK upon success, SR_ERR_ARG upon invalid parameters,
 405  *         SR_ERR_BUG upon internal errors, or another negative error code
 406  *         upon other errors.
 407  */
 408 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 409 {
 410         int ret;
 411
 412         if (!ctx) {
 413                 sr_err("Invalid libsigrok context, can't initialize.");
 414                 return SR_ERR_ARG;
 415         }
 416
 417         if (!driver) {
 418                 sr_err("Invalid driver, can't initialize.");
 419                 return SR_ERR_ARG;
 420         }
 421
 422         sr_spew("Initializing driver '%s'.", driver->name);
 423         if ((ret = driver->init(ctx)) < 0)
 424                 sr_err("Failed to initialize the driver: %d.", ret);
 425
 426         return ret;
 427 }
 428
 429 /**
 430  * Tell a hardware driver to scan for devices.
 431  *
 432  * In addition to the detection, the devices that are found are also
 433  * initialized automatically. On some devices, this involves a firmware upload,
 434  * or other such measures.
 435  *
 436  * The order in which the system is scanned for devices is not specified. The
 437  * caller should not assume or rely on any specific order.
 438  *
 439  * Before calling sr_driver_scan(), the user must have previously initialized
 440  * the driver by calling sr_driver_init().
 441  *
 442  * @param driver The driver that should scan. This must be a pointer to one of
 443  *               the entries returned by sr_driver_list(). Must not be NULL.
 444  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 445  *                scanner. Can be NULL/empty.
 446  *
 447  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 448  *         found (or errors were encountered). This list must be freed by the
 449  *         caller using g_slist_free(), but without freeing the data pointed
 450  *         to in the list.
 451  */
 452 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 453 {
 454         GSList *l;
 455
 456         if (!driver) {
 457                 sr_err("Invalid driver, can't scan for devices.");
 458                 return NULL;
 459         }
 460
 461         if (!driver->priv) {
 462                 sr_err("Driver not initialized, can't scan for devices.");
 463                 return NULL;
 464         }
 465
 466         l = driver->scan(options);
 467
 468         sr_spew("Scan of '%s' found %d devices.", driver->name,
 469                 g_slist_length(l));
 470
 471         return l;
 472 }
 473
 474 /** @private */
 475 SR_PRIV void sr_hw_cleanup_all(void)
 476 {
 477         int i;
 478         struct sr_dev_driver **drivers;
 479
 480         drivers = sr_driver_list();
 481         for (i = 0; drivers[i]; i++) {
 482                 if (drivers[i]->cleanup)
 483                         drivers[i]->cleanup();
 484         }
 485 }
 486
 487 /** A floating reference can be passed in for data.
 488  * @private */
 489 SR_PRIV struct sr_config *sr_config_new(int key, GVariant *data)
 490 {
 491         struct sr_config *src;
 492
 493         if (!(src = g_try_malloc(sizeof(struct sr_config))))
 494                 return NULL;
 495         src->key = key;
 496         src->data = g_variant_ref_sink(data);
 497
 498         return src;
 499 }
 500
 501 /** @private */
 502 SR_PRIV void sr_config_free(struct sr_config *src)
 503 {
 504
 505         if (!src || !src->data) {
 506                 sr_err("%s: invalid data!", __func__);
 507                 return;
 508         }
 509
 510         g_variant_unref(src->data);
 511         g_free(src);
 512
 513 }
 514
 515 /**
 516  * Returns information about the given driver or device instance.
 517  *
 518  * @param driver The sr_dev_driver struct to query.
 519  * @param sdi (optional) If the key is specific to a device, this must
 520  *            contain a pointer to the struct sr_dev_inst to be checked.
 521  *            Otherwise it must be NULL.
 522  * @param probe_group The probe group on the device for which to list the
 523  *                    values, or NULL.
 524  * @param key The configuration key (SR_CONF_*).
 525  * @param data Pointer to a GVariant where the value will be stored. Must
 526  *             not be NULL. The caller is given ownership of the GVariant
 527  *             and must thus decrease the refcount after use. However if
 528  *             this function returns an error code, the field should be
 529  *             considered unused, and should not be unreferenced.
 530  *
 531  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 532  *         may be returned by the driver indicating it doesn't know that key,
 533  *         but this is not to be flagged as an error by the caller; merely
 534  *         as an indication that it's not applicable.
 535  */
 536 SR_API int sr_config_get(const struct sr_dev_driver *driver,
 537                 const struct sr_dev_inst *sdi,
 538                 const struct sr_probe_group *probe_group,
 539                 int key, GVariant **data)
 540 {
 541         int ret;
 542
 543         if (!driver || !data)
 544                 return SR_ERR;
 545
 546         if (!driver->config_get)
 547                 return SR_ERR_ARG;
 548
 549         if ((ret = driver->config_get(key, data, sdi, probe_group)) == SR_OK) {
 550                 /* Got a floating reference from the driver. Sink it here,
 551                  * caller will need to unref when done with it. */
 552                 g_variant_ref_sink(*data);
 553         }
 554
 555         return ret;
 556 }
 557
 558 /**
 559  * Set a configuration key in a device instance.
 560  *
 561  * @param sdi The device instance.
 562  * @param probe_group The probe group on the device for which to list the
 563  *                    values, or NULL.
 564  * @param key The configuration key (SR_CONF_*).
 565  * @param data The new value for the key, as a GVariant with GVariantType
 566  *        appropriate to that key. A floating reference can be passed
 567  *        in; its refcount will be sunk and unreferenced after use.
 568  *
 569  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 570  *         may be returned by the driver indicating it doesn't know that key,
 571  *         but this is not to be flagged as an error by the caller; merely
 572  *         as an indication that it's not applicable.
 573  */
 574 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
 575                 const struct sr_probe_group *probe_group,
 576                 int key, GVariant *data)
 577 {
 578         int ret;
 579
 580         g_variant_ref_sink(data);
 581
 582         if (!sdi || !sdi->driver || !data)
 583                 ret = SR_ERR;
 584         else if (!sdi->driver->config_set)
 585                 ret = SR_ERR_ARG;
 586         else
 587                 ret = sdi->driver->config_set(key, data, sdi, probe_group);
 588
 589         g_variant_unref(data);
 590
 591         return ret;
 592 }
 593
 594 /**
 595  * List all possible values for a configuration key.
 596  *
 597  * @param driver The sr_dev_driver struct to query.
 598  * @param sdi (optional) If the key is specific to a device, this must
 599  *            contain a pointer to the struct sr_dev_inst to be checked.
 600  * @param probe_group The probe group on the device for which to list the
 601  *                    values, or NULL.
 602  * @param key The configuration key (SR_CONF_*).
 603  * @param data A pointer to a GVariant where the list will be stored. The
 604  *             caller is given ownership of the GVariant and must thus
 605  *             unref the GVariant after use. However if this function
 606  *             returns an error code, the field should be considered
 607  *             unused, and should not be unreferenced.
 608  *
 609  * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
 610  *         may be returned by the driver indicating it doesn't know that key,
 611  *         but this is not to be flagged as an error by the caller; merely
 612  *         as an indication that it's not applicable.
 613  */
 614 SR_API int sr_config_list(const struct sr_dev_driver *driver,
 615                 const struct sr_dev_inst *sdi,
 616                 const struct sr_probe_group *probe_group,
 617                 int key, GVariant **data)
 618 {
 619         int ret;
 620
 621         if (!driver || !data)
 622                 ret = SR_ERR;
 623         else if (!driver->config_list)
 624                 ret = SR_ERR_ARG;
 625         else if ((ret = driver->config_list(key, data, sdi, probe_group)) == SR_OK)
 626                 g_variant_ref_sink(*data);
 627
 628         return ret;
 629 }
 630
 631 /**
 632  * Get information about a configuration key.
 633  *
 634  * @param key The configuration key.
 635  *
 636  * @return A pointer to a struct sr_config_info, or NULL if the key
 637  *         was not found.
 638  */
 639 SR_API const struct sr_config_info *sr_config_info_get(int key)
 640 {
 641         int i;
 642
 643         for (i = 0; sr_config_info_data[i].key; i++) {
 644                 if (sr_config_info_data[i].key == key)
 645                         return &sr_config_info_data[i];
 646         }
 647
 648         return NULL;
 649 }
 650
 651 /**
 652  * Get information about an configuration key, by name.
 653  *
 654  * @param optname The configuration key.
 655  *
 656  * @return A pointer to a struct sr_config_info, or NULL if the key
 657  *         was not found.
 658  */
 659 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
 660 {
 661         int i;
 662
 663         for (i = 0; sr_config_info_data[i].key; i++) {
 664                 if (!strcmp(sr_config_info_data[i].id, optname))
 665                         return &sr_config_info_data[i];
 666         }
 667
 668         return NULL;
 669 }
 670
 671 /* Unnecessary level of indirection follows. */
 672
 673 /** @private */
 674 SR_PRIV int sr_source_remove(int fd)
 675 {
 676         return sr_session_source_remove(fd);
 677 }
 678
 679 /** @private */
 680 SR_PRIV int sr_source_add(int fd, int events, int timeout,
 681                           sr_receive_data_callback_t cb, void *cb_data)
 682 {
 683         return sr_session_source_add(fd, events, timeout, cb, cb_data);
 684 }
 685
 686 /** @} */