src/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 <config.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24 #include <dirent.h>
  25 #include <string.h>
  26 #include <glib.h>
  27 #include <libsigrok/libsigrok.h>
  28 #include "libsigrok-internal.h"
  29
  30 /** @cond PRIVATE */
  31 #define LOG_PREFIX "hwdriver"
  32 /** @endcond */
  33
  34 /**
  35  * @file
  36  *
  37  * Hardware driver handling in libsigrok.
  38  */
  39
  40 /**
  41  * @defgroup grp_driver Hardware drivers
  42  *
  43  * Hardware driver handling in libsigrok.
  44  *
  45  * @{
  46  */
  47
  48 /* Please use the same order/grouping as in enum sr_configkey (libsigrok.h). */
  49 static struct sr_key_info sr_key_info_config[] = {
  50         /* Device classes */
  51         {SR_CONF_LOGIC_ANALYZER, SR_T_STRING, NULL, "Logic analyzer", NULL},
  52         {SR_CONF_OSCILLOSCOPE, SR_T_STRING, NULL, "Oscilloscope", NULL},
  53         {SR_CONF_MULTIMETER, SR_T_STRING, NULL, "Multimeter", NULL},
  54         {SR_CONF_DEMO_DEV, SR_T_STRING, NULL, "Demo device", NULL},
  55         {SR_CONF_SOUNDLEVELMETER, SR_T_STRING, NULL, "Sound level meter", NULL},
  56         {SR_CONF_THERMOMETER, SR_T_STRING, NULL, "Thermometer", NULL},
  57         {SR_CONF_HYGROMETER, SR_T_STRING, NULL, "Hygrometer", NULL},
  58         {SR_CONF_ENERGYMETER, SR_T_STRING, NULL, "Energy meter", NULL},
  59         {SR_CONF_DEMODULATOR, SR_T_STRING, NULL, "Demodulator", NULL},
  60         {SR_CONF_POWER_SUPPLY, SR_T_STRING, NULL, "Power supply", NULL},
  61         {SR_CONF_LCRMETER, SR_T_STRING, NULL, "LCR meter", NULL},
  62         {SR_CONF_ELECTRONIC_LOAD, SR_T_STRING, NULL, "Electronic load", NULL},
  63         {SR_CONF_SCALE, SR_T_STRING, NULL, "Scale", NULL},
  64         {SR_CONF_SIGNAL_GENERATOR, SR_T_STRING, NULL, "Signal generator", NULL},
  65         {SR_CONF_POWERMETER, SR_T_STRING, NULL, "Power meter", NULL},
  66
  67         /* Driver scan options */
  68         {SR_CONF_CONN, SR_T_STRING, "conn",
  69                 "Connection", NULL},
  70         {SR_CONF_SERIALCOMM, SR_T_STRING, "serialcomm",
  71                 "Serial communication", NULL},
  72         {SR_CONF_MODBUSADDR, SR_T_UINT64, "modbusaddr",
  73                 "Modbus slave address", NULL},
  74         {SR_CONF_FORCE_DETECT, SR_T_STRING, "force_detect",
  75                 "Forced detection", NULL},
  76
  77         /* Device (or channel group) configuration */
  78         {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
  79                 "Sample rate", NULL},
  80         {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
  81                 "Pre-trigger capture ratio", NULL},
  82         {SR_CONF_PATTERN_MODE, SR_T_STRING, "pattern",
  83                 "Pattern", NULL},
  84         {SR_CONF_RLE, SR_T_BOOL, "rle",
  85                 "Run length encoding", NULL},
  86         {SR_CONF_TRIGGER_SLOPE, SR_T_STRING, "triggerslope",
  87                 "Trigger slope", NULL},
  88         {SR_CONF_AVERAGING, SR_T_BOOL, "averaging",
  89                 "Averaging", NULL},
  90         {SR_CONF_AVG_SAMPLES, SR_T_UINT64, "avg_samples",
  91                 "Number of samples to average over", NULL},
  92         {SR_CONF_TRIGGER_SOURCE, SR_T_STRING, "triggersource",
  93                 "Trigger source", NULL},
  94         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
  95                 "Horizontal trigger position", NULL},
  96         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
  97                 "Buffer size", NULL},
  98         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
  99                 "Time base", NULL},
 100         {SR_CONF_FILTER, SR_T_BOOL, "filter",
 101                 "Filter", NULL},
 102         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
 103                 "Volts/div", NULL},
 104         {SR_CONF_COUPLING, SR_T_STRING, "coupling",
 105                 "Coupling", NULL},
 106         {SR_CONF_TRIGGER_MATCH, SR_T_INT32, "triggermatch",
 107                 "Trigger matches", NULL},
 108         {SR_CONF_SAMPLE_INTERVAL, SR_T_UINT64, "sample_interval",
 109                 "Sample interval", NULL},
 110         {SR_CONF_NUM_HDIV, SR_T_INT32, "num_hdiv",
 111                 "Number of horizontal divisions", NULL},
 112         {SR_CONF_NUM_VDIV, SR_T_INT32, "num_vdiv",
 113                 "Number of vertical divisions", NULL},
 114         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_STRING, "spl_weight_freq",
 115                 "Sound pressure level frequency weighting", NULL},
 116         {SR_CONF_SPL_WEIGHT_TIME, SR_T_STRING, "spl_weight_time",
 117                 "Sound pressure level time weighting", NULL},
 118         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
 119                 "Sound pressure level measurement range", NULL},
 120         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
 121                 "Hold max", NULL},
 122         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
 123                 "Hold min", NULL},
 124         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
 125                 "Voltage threshold", NULL },
 126         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
 127                 "External clock mode", NULL},
 128         {SR_CONF_SWAP, SR_T_BOOL, "swap",
 129                 "Swap channel order", NULL},
 130         {SR_CONF_CENTER_FREQUENCY, SR_T_UINT64, "center_frequency",
 131                 "Center frequency", NULL},
 132         {SR_CONF_NUM_LOGIC_CHANNELS, SR_T_INT32, "logic_channels",
 133                 "Number of logic channels", NULL},
 134         {SR_CONF_NUM_ANALOG_CHANNELS, SR_T_INT32, "analog_channels",
 135                 "Number of analog channels", NULL},
 136         {SR_CONF_VOLTAGE, SR_T_FLOAT, "voltage",
 137                 "Current voltage", NULL},
 138         {SR_CONF_VOLTAGE_TARGET, SR_T_FLOAT, "voltage_target",
 139                 "Voltage target", NULL},
 140         {SR_CONF_CURRENT, SR_T_FLOAT, "current",
 141                 "Current current", NULL},
 142         {SR_CONF_CURRENT_LIMIT, SR_T_FLOAT, "current_limit",
 143                 "Current limit", NULL},
 144         {SR_CONF_ENABLED, SR_T_BOOL, "enabled",
 145                 "Channel enabled", NULL},
 146         {SR_CONF_CHANNEL_CONFIG, SR_T_STRING, "channel_config",
 147                 "Channel modes", NULL},
 148         {SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED, SR_T_BOOL, "ovp_enabled",
 149                 "Over-voltage protection enabled", NULL},
 150         {SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE, SR_T_BOOL, "ovp_active",
 151                 "Over-voltage protection active", NULL},
 152         {SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD, SR_T_FLOAT, "ovp_threshold",
 153                 "Over-voltage protection threshold", NULL},
 154         {SR_CONF_OVER_CURRENT_PROTECTION_ENABLED, SR_T_BOOL, "ocp_enabled",
 155                 "Over-current protection enabled", NULL},
 156         {SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE, SR_T_BOOL, "ocp_active",
 157                 "Over-current protection active", NULL},
 158         {SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD, SR_T_FLOAT, "ocp_threshold",
 159                 "Over-current protection threshold", NULL},
 160         {SR_CONF_CLOCK_EDGE, SR_T_STRING, "clock_edge",
 161                 "Clock edge", NULL},
 162         {SR_CONF_AMPLITUDE, SR_T_FLOAT, "amplitude",
 163                 "Amplitude", NULL},
 164         {SR_CONF_REGULATION, SR_T_STRING, "regulation",
 165                 "Channel regulation", NULL},
 166         {SR_CONF_OVER_TEMPERATURE_PROTECTION, SR_T_BOOL, "otp",
 167                 "Over-temperature protection", NULL},
 168         {SR_CONF_OUTPUT_FREQUENCY, SR_T_FLOAT, "output_frequency",
 169                 "Output frequency", NULL},
 170         {SR_CONF_OUTPUT_FREQUENCY_TARGET, SR_T_FLOAT, "output_frequency_target",
 171                 "Output frequency target", NULL},
 172         {SR_CONF_MEASURED_QUANTITY, SR_T_MQ, "measured_quantity",
 173                 "Measured quantity", NULL},
 174         {SR_CONF_EQUIV_CIRCUIT_MODEL, SR_T_STRING, "equiv_circuit_model",
 175                 "Equivalent circuit model", NULL},
 176         {SR_CONF_OVER_TEMPERATURE_PROTECTION_ACTIVE, SR_T_BOOL, "otp_active",
 177                 "Over-temperature protection active", NULL},
 178         {SR_CONF_UNDER_VOLTAGE_CONDITION, SR_T_BOOL, "uvc",
 179                 "Under-voltage condition", NULL},
 180         {SR_CONF_UNDER_VOLTAGE_CONDITION_ACTIVE, SR_T_BOOL, "uvc_active",
 181                 "Under-voltage condition active", NULL},
 182         {SR_CONF_UNDER_VOLTAGE_CONDITION_THRESHOLD, SR_T_FLOAT, "uvc_threshold",
 183                 "Under-voltage condition threshold", NULL},
 184         {SR_CONF_TRIGGER_LEVEL, SR_T_FLOAT, "triggerlevel",
 185                 "Trigger level", NULL},
 186         {SR_CONF_EXTERNAL_CLOCK_SOURCE, SR_T_STRING, "external_clock_source",
 187                 "External clock source", NULL},
 188         {SR_CONF_OFFSET, SR_T_FLOAT, "offset",
 189                 "Offset", NULL},
 190         {SR_CONF_TRIGGER_PATTERN, SR_T_STRING, "triggerpattern",
 191                 "Trigger pattern", NULL},
 192         {SR_CONF_HIGH_RESOLUTION, SR_T_BOOL, "highresolution",
 193                 "High resolution", NULL},
 194         {SR_CONF_PEAK_DETECTION, SR_T_BOOL, "peakdetection",
 195                 "Peak detection", NULL},
 196         {SR_CONF_LOGIC_THRESHOLD, SR_T_STRING, "logic_threshold",
 197                 "Logic threshold (predefined)", NULL},
 198         {SR_CONF_LOGIC_THRESHOLD_CUSTOM, SR_T_FLOAT, "logic_threshold_custom",
 199                 "Logic threshold (custom)", NULL},
 200         {SR_CONF_RANGE, SR_T_STRING, "range",
 201                 "Range", NULL},
 202         {SR_CONF_DIGITS, SR_T_STRING, "digits",
 203                 "Digits", NULL},
 204         {SR_CONF_PHASE, SR_T_FLOAT, "phase",
 205                 "Phase", NULL},
 206         {SR_CONF_DUTY_CYCLE, SR_T_FLOAT, "output_duty_cycle",
 207                 "Duty Cycle", NULL},
 208         {SR_CONF_POWER, SR_T_FLOAT, "power",
 209                 "Power", NULL},
 210         {SR_CONF_POWER_TARGET, SR_T_FLOAT, "power_target",
 211                 "Power Target", NULL},
 212         {SR_CONF_RESISTANCE_TARGET, SR_T_FLOAT, "resistance_target",
 213                 "Resistance Target", NULL},
 214
 215         /* Special stuff */
 216         {SR_CONF_SESSIONFILE, SR_T_STRING, "sessionfile",
 217                 "Session file", NULL},
 218         {SR_CONF_CAPTUREFILE, SR_T_STRING, "capturefile",
 219                 "Capture file", NULL},
 220         {SR_CONF_CAPTURE_UNITSIZE, SR_T_UINT64, "capture_unitsize",
 221                 "Capture unitsize", NULL},
 222         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
 223                 "Power off", NULL},
 224         {SR_CONF_DATA_SOURCE, SR_T_STRING, "data_source",
 225                 "Data source", NULL},
 226         {SR_CONF_PROBE_FACTOR, SR_T_UINT64, "probe_factor",
 227                 "Probe factor", NULL},
 228         {SR_CONF_ADC_POWERLINE_CYCLES, SR_T_FLOAT, "nplc",
 229                 "Number of ADC powerline cycles", NULL},
 230
 231         /* Acquisition modes, sample limiting */
 232         {SR_CONF_LIMIT_MSEC, SR_T_UINT64, "limit_time",
 233                 "Time limit", NULL},
 234         {SR_CONF_LIMIT_SAMPLES, SR_T_UINT64, "limit_samples",
 235                 "Sample limit", NULL},
 236         {SR_CONF_LIMIT_FRAMES, SR_T_UINT64, "limit_frames",
 237                 "Frame limit", NULL},
 238         {SR_CONF_CONTINUOUS, SR_T_BOOL, "continuous",
 239                 "Continuous sampling", NULL},
 240         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
 241                 "Datalog", NULL},
 242         {SR_CONF_DEVICE_MODE, SR_T_STRING, "device_mode",
 243                 "Device mode", NULL},
 244         {SR_CONF_TEST_MODE, SR_T_STRING, "test_mode",
 245                 "Test mode", NULL},
 246
 247         ALL_ZERO
 248 };
 249
 250 /* Please use the same order as in enum sr_mq (libsigrok.h). */
 251 static struct sr_key_info sr_key_info_mq[] = {
 252         {SR_MQ_VOLTAGE, 0, "voltage", "Voltage", NULL},
 253         {SR_MQ_CURRENT, 0, "current", "Current", NULL},
 254         {SR_MQ_RESISTANCE, 0, "resistance", "Resistance", NULL},
 255         {SR_MQ_CAPACITANCE, 0, "capacitance", "Capacitance", NULL},
 256         {SR_MQ_TEMPERATURE, 0, "temperature", "Temperature", NULL},
 257         {SR_MQ_FREQUENCY, 0, "frequency", "Frequency", NULL},
 258         {SR_MQ_DUTY_CYCLE, 0, "duty_cycle", "Duty cycle", NULL},
 259         {SR_MQ_CONTINUITY, 0, "continuity", "Continuity", NULL},
 260         {SR_MQ_PULSE_WIDTH, 0, "pulse_width", "Pulse width", NULL},
 261         {SR_MQ_CONDUCTANCE, 0, "conductance", "Conductance", NULL},
 262         {SR_MQ_POWER, 0, "power", "Power", NULL},
 263         {SR_MQ_GAIN, 0, "gain", "Gain", NULL},
 264         {SR_MQ_SOUND_PRESSURE_LEVEL, 0, "spl", "Sound pressure level", NULL},
 265         {SR_MQ_CARBON_MONOXIDE, 0, "co", "Carbon monoxide", NULL},
 266         {SR_MQ_RELATIVE_HUMIDITY, 0, "rh", "Relative humidity", NULL},
 267         {SR_MQ_TIME, 0, "time", "Time", NULL},
 268         {SR_MQ_WIND_SPEED, 0, "wind_speed", "Wind speed", NULL},
 269         {SR_MQ_PRESSURE, 0, "pressure", "Pressure", NULL},
 270         {SR_MQ_PARALLEL_INDUCTANCE, 0, "parallel_inductance", "Parallel inductance", NULL},
 271         {SR_MQ_PARALLEL_CAPACITANCE, 0, "parallel_capacitance", "Parallel capacitance", NULL},
 272         {SR_MQ_PARALLEL_RESISTANCE, 0, "parallel_resistance", "Parallel resistance", NULL},
 273         {SR_MQ_SERIES_INDUCTANCE, 0, "series_inductance", "Series inductance", NULL},
 274         {SR_MQ_SERIES_CAPACITANCE, 0, "series_capacitance", "Series capacitance", NULL},
 275         {SR_MQ_SERIES_RESISTANCE, 0, "series_resistance", "Series resistance", NULL},
 276         {SR_MQ_DISSIPATION_FACTOR, 0, "dissipation_factor", "Dissipation factor", NULL},
 277         {SR_MQ_QUALITY_FACTOR, 0, "quality_factor", "Quality factor", NULL},
 278         {SR_MQ_PHASE_ANGLE, 0, "phase_angle", "Phase angle", NULL},
 279         {SR_MQ_DIFFERENCE, 0, "difference", "Difference", NULL},
 280         {SR_MQ_COUNT, 0, "count", "Count", NULL},
 281         {SR_MQ_POWER_FACTOR, 0, "power_factor", "Power factor", NULL},
 282         {SR_MQ_APPARENT_POWER, 0, "apparent_power", "Apparent power", NULL},
 283         {SR_MQ_MASS, 0, "mass", "Mass", NULL},
 284         {SR_MQ_HARMONIC_RATIO, 0, "harmonic_ratio", "Harmonic ratio", NULL},
 285         {SR_MQ_ENERGY, 0, "energy", "Energy", NULL},
 286         {SR_MQ_ELECTRIC_CHARGE, 0, "electric_charge", "Electric charge", NULL},
 287         ALL_ZERO
 288 };
 289
 290 /* Please use the same order as in enum sr_mqflag (libsigrok.h). */
 291 static struct sr_key_info sr_key_info_mqflag[] = {
 292         {SR_MQFLAG_AC, 0, "ac", "AC", NULL},
 293         {SR_MQFLAG_DC, 0, "dc", "DC", NULL},
 294         {SR_MQFLAG_RMS, 0, "rms", "RMS", NULL},
 295         {SR_MQFLAG_DIODE, 0, "diode", "Diode", NULL},
 296         {SR_MQFLAG_HOLD, 0, "hold", "Hold", NULL},
 297         {SR_MQFLAG_MAX, 0, "max", "Max", NULL},
 298         {SR_MQFLAG_MIN, 0, "min", "Min", NULL},
 299         {SR_MQFLAG_AUTORANGE, 0, "auto_range", "Auto range", NULL},
 300         {SR_MQFLAG_RELATIVE, 0, "relative", "Relative", NULL},
 301         {SR_MQFLAG_SPL_FREQ_WEIGHT_A, 0, "spl_freq_weight_a",
 302                 "Frequency weighted (A)", NULL},
 303         {SR_MQFLAG_SPL_FREQ_WEIGHT_C, 0, "spl_freq_weight_c",
 304                 "Frequency weighted (C)", NULL},
 305         {SR_MQFLAG_SPL_FREQ_WEIGHT_Z, 0, "spl_freq_weight_z",
 306                 "Frequency weighted (Z)", NULL},
 307         {SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, 0, "spl_freq_weight_flat",
 308                 "Frequency weighted (flat)", NULL},
 309         {SR_MQFLAG_SPL_TIME_WEIGHT_S, 0, "spl_time_weight_s",
 310                 "Time weighted (S)", NULL},
 311         {SR_MQFLAG_SPL_TIME_WEIGHT_F, 0, "spl_time_weight_f",
 312                 "Time weighted (F)", NULL},
 313         {SR_MQFLAG_SPL_LAT, 0, "spl_time_average", "Time-averaged (LEQ)", NULL},
 314         {SR_MQFLAG_SPL_PCT_OVER_ALARM, 0, "spl_pct_over_alarm",
 315                 "Percentage over alarm", NULL},
 316         {SR_MQFLAG_DURATION, 0, "duration", "Duration", NULL},
 317         {SR_MQFLAG_AVG, 0, "average", "Average", NULL},
 318         {SR_MQFLAG_REFERENCE, 0, "reference", "Reference", NULL},
 319         {SR_MQFLAG_UNSTABLE, 0, "unstable", "Unstable", NULL},
 320         {SR_MQFLAG_FOUR_WIRE, 0, "four_wire", "4-Wire", NULL},
 321         ALL_ZERO
 322 };
 323
 324 /* This must handle all the keys from enum sr_datatype (libsigrok.h). */
 325 /** @private */
 326 SR_PRIV const GVariantType *sr_variant_type_get(int datatype)
 327 {
 328         switch (datatype) {
 329         case SR_T_INT32:
 330                 return G_VARIANT_TYPE_INT32;
 331         case SR_T_UINT64:
 332                 return G_VARIANT_TYPE_UINT64;
 333         case SR_T_STRING:
 334                 return G_VARIANT_TYPE_STRING;
 335         case SR_T_BOOL:
 336                 return G_VARIANT_TYPE_BOOLEAN;
 337         case SR_T_FLOAT:
 338                 return G_VARIANT_TYPE_DOUBLE;
 339         case SR_T_RATIONAL_PERIOD:
 340         case SR_T_RATIONAL_VOLT:
 341         case SR_T_UINT64_RANGE:
 342         case SR_T_DOUBLE_RANGE:
 343                 return G_VARIANT_TYPE_TUPLE;
 344         case SR_T_KEYVALUE:
 345                 return G_VARIANT_TYPE_DICTIONARY;
 346         case SR_T_MQ:
 347                 return G_VARIANT_TYPE_TUPLE;
 348         default:
 349                 return NULL;
 350         }
 351 }
 352
 353 /** @private */
 354 SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
 355 {
 356         const struct sr_key_info *info;
 357         const GVariantType *type, *expected;
 358         char *expected_string, *type_string;
 359
 360         info = sr_key_info_get(SR_KEY_CONFIG, key);
 361         if (!info)
 362                 return SR_OK;
 363
 364         expected = sr_variant_type_get(info->datatype);
 365         type = g_variant_get_type(value);
 366         if (!g_variant_type_equal(type, expected)
 367                         && !g_variant_type_is_subtype_of(type, expected)) {
 368                 expected_string = g_variant_type_dup_string(expected);
 369                 type_string = g_variant_type_dup_string(type);
 370                 sr_err("Wrong variant type for key '%s': expected '%s', got '%s'",
 371                         info->name, expected_string, type_string);
 372                 g_free(expected_string);
 373                 g_free(type_string);
 374                 return SR_ERR_ARG;
 375         }
 376
 377         return SR_OK;
 378 }
 379
 380 /**
 381  * Return the list of supported hardware drivers.
 382  *
 383  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
 384  *
 385  * @retval NULL The ctx argument was NULL, or there are no supported drivers.
 386  * @retval Other Pointer to the NULL-terminated list of hardware drivers.
 387  *               The user should NOT g_free() this list, sr_exit() will do that.
 388  *
 389  * @since 0.4.0
 390  */
 391 SR_API struct sr_dev_driver **sr_driver_list(const struct sr_context *ctx)
 392 {
 393         if (!ctx)
 394                 return NULL;
 395
 396         return ctx->driver_list;
 397 }
 398
 399 /**
 400  * Initialize a hardware driver.
 401  *
 402  * This usually involves memory allocations and variable initializations
 403  * within the driver, but _not_ scanning for attached devices.
 404  * The API call sr_driver_scan() is used for that.
 405  *
 406  * @param ctx A libsigrok context object allocated by a previous call to
 407  *            sr_init(). Must not be NULL.
 408  * @param driver The driver to initialize. This must be a pointer to one of
 409  *               the entries returned by sr_driver_list(). Must not be NULL.
 410  *
 411  * @retval SR_OK Success
 412  * @retval SR_ERR_ARG Invalid parameter(s).
 413  * @retval SR_ERR_BUG Internal errors.
 414  * @retval other Another negative error code upon other errors.
 415  *
 416  * @since 0.2.0
 417  */
 418 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 419 {
 420         int ret;
 421
 422         if (!ctx) {
 423                 sr_err("Invalid libsigrok context, can't initialize.");
 424                 return SR_ERR_ARG;
 425         }
 426
 427         if (!driver) {
 428                 sr_err("Invalid driver, can't initialize.");
 429                 return SR_ERR_ARG;
 430         }
 431
 432         /* No log message here, too verbose and not very useful. */
 433
 434         if ((ret = driver->init(driver, ctx)) < 0)
 435                 sr_err("Failed to initialize the driver: %d.", ret);
 436
 437         return ret;
 438 }
 439
 440 /**
 441  * Enumerate scan options supported by this driver.
 442  *
 443  * Before calling sr_driver_scan_options_list(), the user must have previously
 444  * initialized the driver by calling sr_driver_init().
 445  *
 446  * @param driver The driver to enumerate options for. This must be a pointer
 447  *               to one of the entries returned by sr_driver_list(). Must not
 448  *               be NULL.
 449  *
 450  * @return A GArray * of uint32_t entries, or NULL on invalid arguments. Each
 451  *         entry is a configuration key that is supported as a scan option.
 452  *         The array must be freed by the caller using g_array_free().
 453  *
 454  * @since 0.4.0
 455  */
 456 SR_API GArray *sr_driver_scan_options_list(const struct sr_dev_driver *driver)
 457 {
 458         GVariant *gvar;
 459         const uint32_t *opts;
 460         gsize num_opts;
 461         GArray *result;
 462
 463         if (sr_config_list(driver, NULL, NULL, SR_CONF_SCAN_OPTIONS, &gvar) != SR_OK)
 464                 return NULL;
 465
 466         opts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(uint32_t));
 467
 468         result = g_array_sized_new(FALSE, FALSE, sizeof(uint32_t), num_opts);
 469
 470         g_array_insert_vals(result, 0, opts, num_opts);
 471
 472         g_variant_unref(gvar);
 473
 474         return result;
 475 }
 476
 477 static int check_options(struct sr_dev_driver *driver, GSList *options,
 478                 uint32_t optlist_key, struct sr_dev_inst *sdi,
 479                 struct sr_channel_group *cg)
 480 {
 481         struct sr_config *src;
 482         const struct sr_key_info *srci;
 483         GVariant *gvar_opts;
 484         GSList *l;
 485         const uint32_t *opts;
 486         gsize num_opts, i;
 487         int ret;
 488
 489         if (sr_config_list(driver, sdi, cg, optlist_key, &gvar_opts) != SR_OK) {
 490                 /* Driver publishes no options for this optlist. */
 491                 return SR_ERR;
 492         }
 493
 494         ret = SR_OK;
 495         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
 496         for (l = options; l; l = l->next) {
 497                 src = l->data;
 498                 for (i = 0; i < num_opts; i++) {
 499                         if (opts[i] == src->key)
 500                                 break;
 501                 }
 502                 if (i == num_opts) {
 503                         if (!(srci = sr_key_info_get(SR_KEY_CONFIG, src->key)))
 504                                 /* Shouldn't happen. */
 505                                 sr_err("Invalid option %d.", src->key);
 506                         else
 507                                 sr_err("Invalid option '%s'.", srci->id);
 508                         ret = SR_ERR_ARG;
 509                         break;
 510                 }
 511                 if (sr_variant_type_check(src->key, src->data) != SR_OK) {
 512                         ret = SR_ERR_ARG;
 513                         break;
 514                 }
 515         }
 516         g_variant_unref(gvar_opts);
 517
 518         return ret;
 519 }
 520
 521 /**
 522  * Tell a hardware driver to scan for devices.
 523  *
 524  * In addition to the detection, the devices that are found are also
 525  * initialized automatically. On some devices, this involves a firmware upload,
 526  * or other such measures.
 527  *
 528  * The order in which the system is scanned for devices is not specified. The
 529  * caller should not assume or rely on any specific order.
 530  *
 531  * Before calling sr_driver_scan(), the user must have previously initialized
 532  * the driver by calling sr_driver_init().
 533  *
 534  * @param driver The driver that should scan. This must be a pointer to one of
 535  *               the entries returned by sr_driver_list(). Must not be NULL.
 536  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 537  *                scanner. Can be NULL/empty.
 538  *
 539  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 540  *         found (or errors were encountered). This list must be freed by the
 541  *         caller using g_slist_free(), but without freeing the data pointed
 542  *         to in the list.
 543  *
 544  * @since 0.2.0
 545  */
 546 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 547 {
 548         GSList *l;
 549
 550         if (!driver) {
 551                 sr_err("Invalid driver, can't scan for devices.");
 552                 return NULL;
 553         }
 554
 555         if (!driver->context) {
 556                 sr_err("Driver not initialized, can't scan for devices.");
 557                 return NULL;
 558         }
 559
 560         if (options) {
 561                 if (check_options(driver, options, SR_CONF_SCAN_OPTIONS, NULL, NULL) != SR_OK)
 562                         return NULL;
 563         }
 564
 565         l = driver->scan(driver, options);
 566
 567         sr_spew("Scan found %d devices (%s).", g_slist_length(l), driver->name);
 568
 569         return l;
 570 }
 571
 572 /**
 573  * Call driver cleanup function for all drivers.
 574  *
 575  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
 576  *
 577  * @private
 578  */
 579 SR_PRIV void sr_hw_cleanup_all(const struct sr_context *ctx)
 580 {
 581         int i;
 582         struct sr_dev_driver **drivers;
 583
 584         if (!ctx)
 585                 return;
 586
 587         sr_dbg("Cleaning up all drivers.");
 588
 589         drivers = sr_driver_list(ctx);
 590         for (i = 0; drivers[i]; i++) {
 591                 if (drivers[i]->cleanup)
 592                         drivers[i]->cleanup(drivers[i]);
 593                 drivers[i]->context = NULL;
 594         }
 595 }
 596
 597 /**
 598  * Allocate struct sr_config.
 599  *
 600  * A floating reference can be passed in for data.
 601  *
 602  * @param key The config key to use.
 603  * @param data The GVariant data to use.
 604  *
 605  * @return The newly allocated struct sr_config. This function is assumed
 606  *         to never fail.
 607  *
 608  * @private
 609  */
 610 SR_PRIV struct sr_config *sr_config_new(uint32_t key, GVariant *data)
 611 {
 612         struct sr_config *src;
 613
 614         src = g_malloc0(sizeof(struct sr_config));
 615         src->key = key;
 616         src->data = g_variant_ref_sink(data);
 617
 618         return src;
 619 }
 620
 621 /**
 622  * Free struct sr_config.
 623  *
 624  * @private
 625  */
 626 SR_PRIV void sr_config_free(struct sr_config *src)
 627 {
 628         if (!src || !src->data) {
 629                 sr_err("%s: invalid data!", __func__);
 630                 return;
 631         }
 632
 633         g_variant_unref(src->data);
 634         g_free(src);
 635 }
 636
 637 /** @private */
 638 SR_PRIV int sr_dev_acquisition_start(struct sr_dev_inst *sdi)
 639 {
 640         if (!sdi || !sdi->driver) {
 641                 sr_err("%s: Invalid arguments.", __func__);
 642                 return SR_ERR_ARG;
 643         }
 644
 645         if (sdi->status != SR_ST_ACTIVE) {
 646                 sr_err("%s: Device instance not active, can't start.",
 647                         sdi->driver->name);
 648                 return SR_ERR_DEV_CLOSED;
 649         }
 650
 651         sr_dbg("%s: Starting acquisition.", sdi->driver->name);
 652
 653         return sdi->driver->dev_acquisition_start(sdi);
 654 }
 655
 656 /** @private */
 657 SR_PRIV int sr_dev_acquisition_stop(struct sr_dev_inst *sdi)
 658 {
 659         if (!sdi || !sdi->driver) {
 660                 sr_err("%s: Invalid arguments.", __func__);
 661                 return SR_ERR_ARG;
 662         }
 663
 664         if (sdi->status != SR_ST_ACTIVE) {
 665                 sr_err("%s: Device instance not active, can't stop.",
 666                         sdi->driver->name);
 667                 return SR_ERR_DEV_CLOSED;
 668         }
 669
 670         sr_dbg("%s: Stopping acquisition.", sdi->driver->name);
 671
 672         return sdi->driver->dev_acquisition_stop(sdi);
 673 }
 674
 675 static void log_key(const struct sr_dev_inst *sdi,
 676         const struct sr_channel_group *cg, uint32_t key, unsigned int op,
 677         GVariant *data)
 678 {
 679         const char *opstr;
 680         const struct sr_key_info *srci;
 681         gchar *tmp_str;
 682
 683         /* Don't log SR_CONF_DEVICE_OPTIONS, it's verbose and not too useful. */
 684         if (key == SR_CONF_DEVICE_OPTIONS)
 685                 return;
 686
 687         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
 688         srci = sr_key_info_get(SR_KEY_CONFIG, key);
 689
 690         tmp_str = g_variant_print(data, TRUE);
 691         sr_spew("sr_config_%s(): key %d (%s) sdi %p cg %s -> %s", opstr, key,
 692                 srci ? srci->id : "NULL", sdi, cg ? cg->name : "NULL",
 693                 data ? tmp_str : "NULL");
 694         g_free(tmp_str);
 695 }
 696
 697 static int check_key(const struct sr_dev_driver *driver,
 698                 const struct sr_dev_inst *sdi, const struct sr_channel_group *cg,
 699                 uint32_t key, unsigned int op, GVariant *data)
 700 {
 701         const struct sr_key_info *srci;
 702         gsize num_opts, i;
 703         GVariant *gvar_opts;
 704         const uint32_t *opts;
 705         uint32_t pub_opt;
 706         const char *suffix;
 707         const char *opstr;
 708
 709         if (sdi && cg)
 710                 suffix = " for this device instance and channel group";
 711         else if (sdi)
 712                 suffix = " for this device instance";
 713         else
 714                 suffix = "";
 715
 716         if (!(srci = sr_key_info_get(SR_KEY_CONFIG, key))) {
 717                 sr_err("Invalid key %d.", key);
 718                 return SR_ERR_ARG;
 719         }
 720         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
 721
 722         switch (key) {
 723         case SR_CONF_LIMIT_MSEC:
 724         case SR_CONF_LIMIT_SAMPLES:
 725         case SR_CONF_SAMPLERATE:
 726                 /* Setting any of these to 0 is not useful. */
 727                 if (op != SR_CONF_SET || !data)
 728                         break;
 729                 if (g_variant_get_uint64(data) == 0) {
 730                         sr_err("Cannot set '%s' to 0.", srci->id);
 731                         return SR_ERR_ARG;
 732                 }
 733                 break;
 734         case SR_CONF_CAPTURE_RATIO:
 735                 /* Capture ratio must always be between 0 and 100. */
 736                 if (op != SR_CONF_SET || !data)
 737                         break;
 738                 if (g_variant_get_uint64(data) > 100) {
 739                         sr_err("Capture ratio must be 0..100.");
 740                         return SR_ERR_ARG;
 741                 }
 742                 break;
 743         }
 744
 745         if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS, &gvar_opts) != SR_OK) {
 746                 /* Driver publishes no options. */
 747                 sr_err("No options available%s.", suffix);
 748                 return SR_ERR_ARG;
 749         }
 750         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
 751         pub_opt = 0;
 752         for (i = 0; i < num_opts; i++) {
 753                 if ((opts[i] & SR_CONF_MASK) == key) {
 754                         pub_opt = opts[i];
 755                         break;
 756                 }
 757         }
 758         g_variant_unref(gvar_opts);
 759         if (!pub_opt) {
 760                 sr_err("Option '%s' not available%s.", srci->id, suffix);
 761                 return SR_ERR_ARG;
 762         }
 763
 764         if (!(pub_opt & op)) {
 765                 sr_err("Option '%s' not available to %s%s.", srci->id, opstr, suffix);
 766                 return SR_ERR_ARG;
 767         }
 768
 769         return SR_OK;
 770 }
 771
 772 /**
 773  * Query value of a configuration key at the given driver or device instance.
 774  *
 775  * @param[in] driver The sr_dev_driver struct to query. Must not be NULL.
 776  * @param[in] sdi (optional) If the key is specific to a device, this must
 777  *            contain a pointer to the struct sr_dev_inst to be checked.
 778  *            Otherwise it must be NULL. If sdi is != NULL, sdi->priv must
 779  *            also be != NULL.
 780  * @param[in] cg The channel group on the device for which to list the
 781  *               values, or NULL.
 782  * @param[in] key The configuration key (SR_CONF_*).
 783  * @param[in,out] data Pointer to a GVariant where the value will be stored.
 784  *             Must not be NULL. The caller is given ownership of the GVariant
 785  *             and must thus decrease the refcount after use. However if
 786  *             this function returns an error code, the field should be
 787  *             considered unused, and should not be unreferenced.
 788  *
 789  * @retval SR_OK Success.
 790  * @retval SR_ERR Error.
 791  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 792  *         interpreted as an error by the caller; merely as an indication
 793  *         that it's not applicable.
 794  *
 795  * @since 0.3.0
 796  */
 797 SR_API int sr_config_get(const struct sr_dev_driver *driver,
 798                 const struct sr_dev_inst *sdi,
 799                 const struct sr_channel_group *cg,
 800                 uint32_t key, GVariant **data)
 801 {
 802         int ret;
 803
 804         if (!driver || !data)
 805                 return SR_ERR;
 806
 807         if (!driver->config_get)
 808                 return SR_ERR_ARG;
 809
 810         if (check_key(driver, sdi, cg, key, SR_CONF_GET, NULL) != SR_OK)
 811                 return SR_ERR_ARG;
 812
 813         if (sdi && !sdi->priv) {
 814                 sr_err("Can't get config (sdi != NULL, sdi->priv == NULL).");
 815                 return SR_ERR;
 816         }
 817
 818         if ((ret = driver->config_get(key, data, sdi, cg)) == SR_OK) {
 819                 log_key(sdi, cg, key, SR_CONF_GET, *data);
 820                 /* Got a floating reference from the driver. Sink it here,
 821                  * caller will need to unref when done with it. */
 822                 g_variant_ref_sink(*data);
 823         }
 824
 825         if (ret == SR_ERR_CHANNEL_GROUP)
 826                 sr_err("%s: No channel group specified.",
 827                         (sdi) ? sdi->driver->name : "unknown");
 828
 829         return ret;
 830 }
 831
 832 /**
 833  * Set value of a configuration key in a device instance.
 834  *
 835  * @param[in] sdi The device instance. Must not be NULL. sdi->driver and
 836  *                sdi->priv must not be NULL either.
 837  * @param[in] cg The channel group on the device for which to list the
 838  *                    values, or NULL.
 839  * @param[in] key The configuration key (SR_CONF_*).
 840  * @param data The new value for the key, as a GVariant with GVariantType
 841  *        appropriate to that key. A floating reference can be passed
 842  *        in; its refcount will be sunk and unreferenced after use.
 843  *
 844  * @retval SR_OK Success.
 845  * @retval SR_ERR Error.
 846  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 847  *         interpreted as an error by the caller; merely as an indication
 848  *         that it's not applicable.
 849  *
 850  * @since 0.3.0
 851  */
 852 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
 853                 const struct sr_channel_group *cg,
 854                 uint32_t key, GVariant *data)
 855 {
 856         int ret;
 857
 858         g_variant_ref_sink(data);
 859
 860         if (!sdi || !sdi->driver || !sdi->priv || !data)
 861                 ret = SR_ERR;
 862         else if (!sdi->driver->config_set)
 863                 ret = SR_ERR_ARG;
 864         else if (sdi->status != SR_ST_ACTIVE) {
 865                 sr_err("%s: Device instance not active, can't set config.",
 866                         sdi->driver->name);
 867                 ret = SR_ERR_DEV_CLOSED;
 868         } else if (check_key(sdi->driver, sdi, cg, key, SR_CONF_SET, data) != SR_OK)
 869                 return SR_ERR_ARG;
 870         else if ((ret = sr_variant_type_check(key, data)) == SR_OK) {
 871                 log_key(sdi, cg, key, SR_CONF_SET, data);
 872                 ret = sdi->driver->config_set(key, data, sdi, cg);
 873         }
 874
 875         g_variant_unref(data);
 876
 877         if (ret == SR_ERR_CHANNEL_GROUP)
 878                 sr_err("%s: No channel group specified.",
 879                         (sdi) ? sdi->driver->name : "unknown");
 880
 881         return ret;
 882 }
 883
 884 /**
 885  * Apply configuration settings to the device hardware.
 886  *
 887  * @param sdi The device instance.
 888  *
 889  * @return SR_OK upon success or SR_ERR in case of error.
 890  *
 891  * @since 0.3.0
 892  */
 893 SR_API int sr_config_commit(const struct sr_dev_inst *sdi)
 894 {
 895         int ret;
 896
 897         if (!sdi || !sdi->driver)
 898                 ret = SR_ERR;
 899         else if (!sdi->driver->config_commit)
 900                 ret = SR_OK;
 901         else if (sdi->status != SR_ST_ACTIVE) {
 902                 sr_err("%s: Device instance not active, can't commit config.",
 903                         sdi->driver->name);
 904                 ret = SR_ERR_DEV_CLOSED;
 905         } else
 906                 ret = sdi->driver->config_commit(sdi);
 907
 908         return ret;
 909 }
 910
 911 /**
 912  * List all possible values for a configuration key.
 913  *
 914  * @param[in] driver The sr_dev_driver struct to query. Must not be NULL.
 915  * @param[in] sdi (optional) If the key is specific to a device instance, this
 916  *            must contain a pointer to the struct sr_dev_inst to be checked.
 917  *            Otherwise it must be NULL. If sdi is != NULL, sdi->priv must
 918  *            also be != NULL.
 919  * @param[in] cg The channel group on the device instance for which to list
 920  *            the values, or NULL. If this device instance doesn't
 921  *            have channel groups, this must not be != NULL.
 922  *            If cg is NULL, this function will return the "common" device
 923  *            instance options that are channel-group independent. Otherwise
 924  *            it will return the channel-group specific options.
 925  * @param[in] key The configuration key (SR_CONF_*).
 926  * @param[in,out] data A pointer to a GVariant where the list will be stored.
 927  *                The caller is given ownership of the GVariant and must thus
 928  *                unref the GVariant after use. However if this function
 929  *                returns an error code, the field should be considered
 930  *                unused, and should not be unreferenced.
 931  *
 932  * @retval SR_OK Success.
 933  * @retval SR_ERR Error.
 934  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 935  *         interpreted as an error by the caller; merely as an indication
 936  *         that it's not applicable.
 937  *
 938  * @since 0.3.0
 939  */
 940 SR_API int sr_config_list(const struct sr_dev_driver *driver,
 941                 const struct sr_dev_inst *sdi,
 942                 const struct sr_channel_group *cg,
 943                 uint32_t key, GVariant **data)
 944 {
 945         int ret;
 946
 947         if (!driver || !data)
 948                 return SR_ERR;
 949
 950         if (!driver->config_list)
 951                 return SR_ERR_ARG;
 952
 953         if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS) {
 954                 if (check_key(driver, sdi, cg, key, SR_CONF_LIST, NULL) != SR_OK)
 955                         return SR_ERR_ARG;
 956         }
 957
 958         if (sdi && !sdi->priv) {
 959                 sr_err("Can't list config (sdi != NULL, sdi->priv == NULL).");
 960                 return SR_ERR;
 961         }
 962
 963         if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS && !sdi) {
 964                 sr_err("Config keys other than SR_CONF_SCAN_OPTIONS and "
 965                        "SR_CONF_DEVICE_OPTIONS always need an sdi.");
 966                 return SR_ERR_ARG;
 967         }
 968
 969         if (cg && sdi && !sdi->channel_groups) {
 970                 sr_err("Can't list config for channel group, there are none.");
 971                 return SR_ERR_ARG;
 972         }
 973
 974         if (cg && sdi && !g_slist_find(sdi->channel_groups, cg)) {
 975                 sr_err("If a channel group is specified, it must be a valid one.");
 976                 return SR_ERR_ARG;
 977         }
 978
 979         if (cg && !sdi) {
 980                 sr_err("Need sdi when a channel group is specified.");
 981                 return SR_ERR_ARG;
 982         }
 983
 984         if ((ret = driver->config_list(key, data, sdi, cg)) == SR_OK) {
 985                 log_key(sdi, cg, key, SR_CONF_LIST, *data);
 986                 g_variant_ref_sink(*data);
 987         }
 988
 989         if (ret == SR_ERR_CHANNEL_GROUP)
 990                 sr_err("%s: No channel group specified.",
 991                         (sdi) ? sdi->driver->name : "unknown");
 992
 993         return ret;
 994 }
 995
 996 static struct sr_key_info *get_keytable(int keytype)
 997 {
 998         struct sr_key_info *table;
 999
1000         switch (keytype) {
1001         case SR_KEY_CONFIG:
1002                 table = sr_key_info_config;
1003                 break;
1004         case SR_KEY_MQ:
1005                 table = sr_key_info_mq;
1006                 break;
1007         case SR_KEY_MQFLAGS:
1008                 table = sr_key_info_mqflag;
1009                 break;
1010         default:
1011                 sr_err("Invalid keytype %d", keytype);
1012                 return NULL;
1013         }
1014
1015         return table;
1016 }
1017
1018 /**
1019  * Get information about a key, by key.
1020  *
1021  * @param[in] keytype The namespace the key is in.
1022  * @param[in] key The key to find.
1023  *
1024  * @return A pointer to a struct sr_key_info, or NULL if the key
1025  *         was not found.
1026  *
1027  * @since 0.3.0
1028  */
1029 SR_API const struct sr_key_info *sr_key_info_get(int keytype, uint32_t key)
1030 {
1031         struct sr_key_info *table;
1032         int i;
1033
1034         if (!(table = get_keytable(keytype)))
1035                 return NULL;
1036
1037         for (i = 0; table[i].key; i++) {
1038                 if (table[i].key == key)
1039                         return &table[i];
1040         }
1041
1042         return NULL;
1043 }
1044
1045 /**
1046  * Get information about a key, by name.
1047  *
1048  * @param[in] keytype The namespace the key is in.
1049  * @param[in] keyid The key id string.
1050  *
1051  * @return A pointer to a struct sr_key_info, or NULL if the key
1052  *         was not found.
1053  *
1054  * @since 0.2.0
1055  */
1056 SR_API const struct sr_key_info *sr_key_info_name_get(int keytype, const char *keyid)
1057 {
1058         struct sr_key_info *table;
1059         int i;
1060
1061         if (!(table = get_keytable(keytype)))
1062                 return NULL;
1063
1064         for (i = 0; table[i].key; i++) {
1065                 if (!table[i].id)
1066                         continue;
1067                 if (!strcmp(table[i].id, keyid))
1068                         return &table[i];
1069         }
1070
1071         return NULL;
1072 }
1073
1074 /** @} */