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         {SR_CONF_MULTIPLEXER, SR_T_STRING, NULL, "Multiplexer", NULL},
  67
  68         /* Driver scan options */
  69         {SR_CONF_CONN, SR_T_STRING, "conn",
  70                 "Connection", NULL},
  71         {SR_CONF_SERIALCOMM, SR_T_STRING, "serialcomm",
  72                 "Serial communication", NULL},
  73         {SR_CONF_MODBUSADDR, SR_T_UINT64, "modbusaddr",
  74                 "Modbus slave address", NULL},
  75         {SR_CONF_FORCE_DETECT, SR_T_STRING, "force_detect",
  76                 "Forced detection", NULL},
  77         {SR_CONF_PROBE_NAMES, SR_T_STRING, "probe_names",
  78                 "Names of device's probes", NULL},
  79
  80         /* Device (or channel group) configuration */
  81         {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
  82                 "Sample rate", NULL},
  83         {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
  84                 "Pre-trigger capture ratio", NULL},
  85         {SR_CONF_PATTERN_MODE, SR_T_STRING, "pattern",
  86                 "Pattern", NULL},
  87         {SR_CONF_RLE, SR_T_BOOL, "rle",
  88                 "Run length encoding", NULL},
  89         {SR_CONF_TRIGGER_SLOPE, SR_T_STRING, "triggerslope",
  90                 "Trigger slope", NULL},
  91         {SR_CONF_AVERAGING, SR_T_BOOL, "averaging",
  92                 "Averaging", NULL},
  93         {SR_CONF_AVG_SAMPLES, SR_T_UINT64, "avg_samples",
  94                 "Number of samples to average over", NULL},
  95         {SR_CONF_TRIGGER_SOURCE, SR_T_STRING, "triggersource",
  96                 "Trigger source", NULL},
  97         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
  98                 "Horizontal trigger position", NULL},
  99         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
 100                 "Buffer size", NULL},
 101         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
 102                 "Time base", NULL},
 103         {SR_CONF_FILTER, SR_T_BOOL, "filter",
 104                 "Filter", NULL},
 105         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
 106                 "Volts/div", NULL},
 107         {SR_CONF_COUPLING, SR_T_STRING, "coupling",
 108                 "Coupling", NULL},
 109         {SR_CONF_TRIGGER_MATCH, SR_T_INT32, "triggermatch",
 110                 "Trigger matches", NULL},
 111         {SR_CONF_SAMPLE_INTERVAL, SR_T_UINT64, "sample_interval",
 112                 "Sample interval", NULL},
 113         {SR_CONF_NUM_HDIV, SR_T_INT32, "num_hdiv",
 114                 "Number of horizontal divisions", NULL},
 115         {SR_CONF_NUM_VDIV, SR_T_INT32, "num_vdiv",
 116                 "Number of vertical divisions", NULL},
 117         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_STRING, "spl_weight_freq",
 118                 "Sound pressure level frequency weighting", NULL},
 119         {SR_CONF_SPL_WEIGHT_TIME, SR_T_STRING, "spl_weight_time",
 120                 "Sound pressure level time weighting", NULL},
 121         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
 122                 "Sound pressure level measurement range", NULL},
 123         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
 124                 "Hold max", NULL},
 125         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
 126                 "Hold min", NULL},
 127         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
 128                 "Voltage threshold", NULL },
 129         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
 130                 "External clock mode", NULL},
 131         {SR_CONF_SWAP, SR_T_BOOL, "swap",
 132                 "Swap channel order", NULL},
 133         {SR_CONF_CENTER_FREQUENCY, SR_T_UINT64, "center_frequency",
 134                 "Center frequency", NULL},
 135         {SR_CONF_NUM_LOGIC_CHANNELS, SR_T_INT32, "logic_channels",
 136                 "Number of logic channels", NULL},
 137         {SR_CONF_NUM_ANALOG_CHANNELS, SR_T_INT32, "analog_channels",
 138                 "Number of analog channels", NULL},
 139         {SR_CONF_VOLTAGE, SR_T_FLOAT, "voltage",
 140                 "Current voltage", NULL},
 141         {SR_CONF_VOLTAGE_TARGET, SR_T_FLOAT, "voltage_target",
 142                 "Voltage target", NULL},
 143         {SR_CONF_CURRENT, SR_T_FLOAT, "current",
 144                 "Current current", NULL},
 145         {SR_CONF_CURRENT_LIMIT, SR_T_FLOAT, "current_limit",
 146                 "Current limit", NULL},
 147         {SR_CONF_ENABLED, SR_T_BOOL, "enabled",
 148                 "Channel enabled", NULL},
 149         {SR_CONF_CHANNEL_CONFIG, SR_T_STRING, "channel_config",
 150                 "Channel modes", NULL},
 151         {SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED, SR_T_BOOL, "ovp_enabled",
 152                 "Over-voltage protection enabled", NULL},
 153         {SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE, SR_T_BOOL, "ovp_active",
 154                 "Over-voltage protection active", NULL},
 155         {SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD, SR_T_FLOAT, "ovp_threshold",
 156                 "Over-voltage protection threshold", NULL},
 157         {SR_CONF_OVER_CURRENT_PROTECTION_ENABLED, SR_T_BOOL, "ocp_enabled",
 158                 "Over-current protection enabled", NULL},
 159         {SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE, SR_T_BOOL, "ocp_active",
 160                 "Over-current protection active", NULL},
 161         {SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD, SR_T_FLOAT, "ocp_threshold",
 162                 "Over-current protection threshold", NULL},
 163         {SR_CONF_CLOCK_EDGE, SR_T_STRING, "clock_edge",
 164                 "Clock edge", NULL},
 165         {SR_CONF_AMPLITUDE, SR_T_FLOAT, "amplitude",
 166                 "Amplitude", NULL},
 167         {SR_CONF_REGULATION, SR_T_STRING, "regulation",
 168                 "Channel regulation", NULL},
 169         {SR_CONF_OVER_TEMPERATURE_PROTECTION, SR_T_BOOL, "otp",
 170                 "Over-temperature protection", NULL},
 171         {SR_CONF_OUTPUT_FREQUENCY, SR_T_FLOAT, "output_frequency",
 172                 "Output frequency", NULL},
 173         {SR_CONF_OUTPUT_FREQUENCY_TARGET, SR_T_FLOAT, "output_frequency_target",
 174                 "Output frequency target", NULL},
 175         {SR_CONF_MEASURED_QUANTITY, SR_T_MQ, "measured_quantity",
 176                 "Measured quantity", NULL},
 177         {SR_CONF_EQUIV_CIRCUIT_MODEL, SR_T_STRING, "equiv_circuit_model",
 178                 "Equivalent circuit model", NULL},
 179         {SR_CONF_OVER_TEMPERATURE_PROTECTION_ACTIVE, SR_T_BOOL, "otp_active",
 180                 "Over-temperature protection active", NULL},
 181         {SR_CONF_UNDER_VOLTAGE_CONDITION, SR_T_BOOL, "uvc",
 182                 "Under-voltage condition", NULL},
 183         {SR_CONF_UNDER_VOLTAGE_CONDITION_ACTIVE, SR_T_BOOL, "uvc_active",
 184                 "Under-voltage condition active", NULL},
 185         {SR_CONF_UNDER_VOLTAGE_CONDITION_THRESHOLD, SR_T_FLOAT, "uvc_threshold",
 186                 "Under-voltage condition threshold", NULL},
 187         {SR_CONF_TRIGGER_LEVEL, SR_T_FLOAT, "triggerlevel",
 188                 "Trigger level", NULL},
 189         {SR_CONF_EXTERNAL_CLOCK_SOURCE, SR_T_STRING, "external_clock_source",
 190                 "External clock source", NULL},
 191         {SR_CONF_OFFSET, SR_T_FLOAT, "offset",
 192                 "Offset", NULL},
 193         {SR_CONF_TRIGGER_PATTERN, SR_T_STRING, "triggerpattern",
 194                 "Trigger pattern", NULL},
 195         {SR_CONF_HIGH_RESOLUTION, SR_T_BOOL, "highresolution",
 196                 "High resolution", NULL},
 197         {SR_CONF_PEAK_DETECTION, SR_T_BOOL, "peakdetection",
 198                 "Peak detection", NULL},
 199         {SR_CONF_LOGIC_THRESHOLD, SR_T_STRING, "logic_threshold",
 200                 "Logic threshold (predefined)", NULL},
 201         {SR_CONF_LOGIC_THRESHOLD_CUSTOM, SR_T_FLOAT, "logic_threshold_custom",
 202                 "Logic threshold (custom)", NULL},
 203         {SR_CONF_RANGE, SR_T_STRING, "range",
 204                 "Range", NULL},
 205         {SR_CONF_DIGITS, SR_T_STRING, "digits",
 206                 "Digits", NULL},
 207         {SR_CONF_PHASE, SR_T_FLOAT, "phase",
 208                 "Phase", NULL},
 209         {SR_CONF_DUTY_CYCLE, SR_T_FLOAT, "output_duty_cycle",
 210                 "Duty Cycle", NULL},
 211         {SR_CONF_POWER, SR_T_FLOAT, "power",
 212                 "Power", NULL},
 213         {SR_CONF_POWER_TARGET, SR_T_FLOAT, "power_target",
 214                 "Power Target", NULL},
 215         {SR_CONF_RESISTANCE_TARGET, SR_T_FLOAT, "resistance_target",
 216                 "Resistance Target", NULL},
 217
 218         /* Special stuff */
 219         {SR_CONF_SESSIONFILE, SR_T_STRING, "sessionfile",
 220                 "Session file", NULL},
 221         {SR_CONF_CAPTUREFILE, SR_T_STRING, "capturefile",
 222                 "Capture file", NULL},
 223         {SR_CONF_CAPTURE_UNITSIZE, SR_T_UINT64, "capture_unitsize",
 224                 "Capture unitsize", NULL},
 225         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
 226                 "Power off", NULL},
 227         {SR_CONF_DATA_SOURCE, SR_T_STRING, "data_source",
 228                 "Data source", NULL},
 229         {SR_CONF_PROBE_FACTOR, SR_T_UINT64, "probe_factor",
 230                 "Probe factor", NULL},
 231         {SR_CONF_ADC_POWERLINE_CYCLES, SR_T_FLOAT, "nplc",
 232                 "Number of ADC powerline cycles", NULL},
 233
 234         /* Acquisition modes, sample limiting */
 235         {SR_CONF_LIMIT_MSEC, SR_T_UINT64, "limit_time",
 236                 "Time limit", NULL},
 237         {SR_CONF_LIMIT_SAMPLES, SR_T_UINT64, "limit_samples",
 238                 "Sample limit", NULL},
 239         {SR_CONF_LIMIT_FRAMES, SR_T_UINT64, "limit_frames",
 240                 "Frame limit", NULL},
 241         {SR_CONF_CONTINUOUS, SR_T_BOOL, "continuous",
 242                 "Continuous sampling", NULL},
 243         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
 244                 "Datalog", NULL},
 245         {SR_CONF_DEVICE_MODE, SR_T_STRING, "device_mode",
 246                 "Device mode", NULL},
 247         {SR_CONF_TEST_MODE, SR_T_STRING, "test_mode",
 248                 "Test mode", NULL},
 249
 250         ALL_ZERO
 251 };
 252
 253 /* Please use the same order as in enum sr_mq (libsigrok.h). */
 254 static struct sr_key_info sr_key_info_mq[] = {
 255         {SR_MQ_VOLTAGE, 0, "voltage", "Voltage", NULL},
 256         {SR_MQ_CURRENT, 0, "current", "Current", NULL},
 257         {SR_MQ_RESISTANCE, 0, "resistance", "Resistance", NULL},
 258         {SR_MQ_CAPACITANCE, 0, "capacitance", "Capacitance", NULL},
 259         {SR_MQ_TEMPERATURE, 0, "temperature", "Temperature", NULL},
 260         {SR_MQ_FREQUENCY, 0, "frequency", "Frequency", NULL},
 261         {SR_MQ_DUTY_CYCLE, 0, "duty_cycle", "Duty cycle", NULL},
 262         {SR_MQ_CONTINUITY, 0, "continuity", "Continuity", NULL},
 263         {SR_MQ_PULSE_WIDTH, 0, "pulse_width", "Pulse width", NULL},
 264         {SR_MQ_CONDUCTANCE, 0, "conductance", "Conductance", NULL},
 265         {SR_MQ_POWER, 0, "power", "Power", NULL},
 266         {SR_MQ_GAIN, 0, "gain", "Gain", NULL},
 267         {SR_MQ_SOUND_PRESSURE_LEVEL, 0, "spl", "Sound pressure level", NULL},
 268         {SR_MQ_CARBON_MONOXIDE, 0, "co", "Carbon monoxide", NULL},
 269         {SR_MQ_RELATIVE_HUMIDITY, 0, "rh", "Relative humidity", NULL},
 270         {SR_MQ_TIME, 0, "time", "Time", NULL},
 271         {SR_MQ_WIND_SPEED, 0, "wind_speed", "Wind speed", NULL},
 272         {SR_MQ_PRESSURE, 0, "pressure", "Pressure", NULL},
 273         {SR_MQ_PARALLEL_INDUCTANCE, 0, "parallel_inductance", "Parallel inductance", NULL},
 274         {SR_MQ_PARALLEL_CAPACITANCE, 0, "parallel_capacitance", "Parallel capacitance", NULL},
 275         {SR_MQ_PARALLEL_RESISTANCE, 0, "parallel_resistance", "Parallel resistance", NULL},
 276         {SR_MQ_SERIES_INDUCTANCE, 0, "series_inductance", "Series inductance", NULL},
 277         {SR_MQ_SERIES_CAPACITANCE, 0, "series_capacitance", "Series capacitance", NULL},
 278         {SR_MQ_SERIES_RESISTANCE, 0, "series_resistance", "Series resistance", NULL},
 279         {SR_MQ_DISSIPATION_FACTOR, 0, "dissipation_factor", "Dissipation factor", NULL},
 280         {SR_MQ_QUALITY_FACTOR, 0, "quality_factor", "Quality factor", NULL},
 281         {SR_MQ_PHASE_ANGLE, 0, "phase_angle", "Phase angle", NULL},
 282         {SR_MQ_DIFFERENCE, 0, "difference", "Difference", NULL},
 283         {SR_MQ_COUNT, 0, "count", "Count", NULL},
 284         {SR_MQ_POWER_FACTOR, 0, "power_factor", "Power factor", NULL},
 285         {SR_MQ_APPARENT_POWER, 0, "apparent_power", "Apparent power", NULL},
 286         {SR_MQ_MASS, 0, "mass", "Mass", NULL},
 287         {SR_MQ_HARMONIC_RATIO, 0, "harmonic_ratio", "Harmonic ratio", NULL},
 288         {SR_MQ_ENERGY, 0, "energy", "Energy", NULL},
 289         {SR_MQ_ELECTRIC_CHARGE, 0, "electric_charge", "Electric charge", NULL},
 290         ALL_ZERO
 291 };
 292
 293 /* Please use the same order as in enum sr_mqflag (libsigrok.h). */
 294 static struct sr_key_info sr_key_info_mqflag[] = {
 295         {SR_MQFLAG_AC, 0, "ac", "AC", NULL},
 296         {SR_MQFLAG_DC, 0, "dc", "DC", NULL},
 297         {SR_MQFLAG_RMS, 0, "rms", "RMS", NULL},
 298         {SR_MQFLAG_DIODE, 0, "diode", "Diode", NULL},
 299         {SR_MQFLAG_HOLD, 0, "hold", "Hold", NULL},
 300         {SR_MQFLAG_MAX, 0, "max", "Max", NULL},
 301         {SR_MQFLAG_MIN, 0, "min", "Min", NULL},
 302         {SR_MQFLAG_AUTORANGE, 0, "auto_range", "Auto range", NULL},
 303         {SR_MQFLAG_RELATIVE, 0, "relative", "Relative", NULL},
 304         {SR_MQFLAG_SPL_FREQ_WEIGHT_A, 0, "spl_freq_weight_a",
 305                 "Frequency weighted (A)", NULL},
 306         {SR_MQFLAG_SPL_FREQ_WEIGHT_C, 0, "spl_freq_weight_c",
 307                 "Frequency weighted (C)", NULL},
 308         {SR_MQFLAG_SPL_FREQ_WEIGHT_Z, 0, "spl_freq_weight_z",
 309                 "Frequency weighted (Z)", NULL},
 310         {SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT, 0, "spl_freq_weight_flat",
 311                 "Frequency weighted (flat)", NULL},
 312         {SR_MQFLAG_SPL_TIME_WEIGHT_S, 0, "spl_time_weight_s",
 313                 "Time weighted (S)", NULL},
 314         {SR_MQFLAG_SPL_TIME_WEIGHT_F, 0, "spl_time_weight_f",
 315                 "Time weighted (F)", NULL},
 316         {SR_MQFLAG_SPL_LAT, 0, "spl_time_average", "Time-averaged (LEQ)", NULL},
 317         {SR_MQFLAG_SPL_PCT_OVER_ALARM, 0, "spl_pct_over_alarm",
 318                 "Percentage over alarm", NULL},
 319         {SR_MQFLAG_DURATION, 0, "duration", "Duration", NULL},
 320         {SR_MQFLAG_AVG, 0, "average", "Average", NULL},
 321         {SR_MQFLAG_REFERENCE, 0, "reference", "Reference", NULL},
 322         {SR_MQFLAG_UNSTABLE, 0, "unstable", "Unstable", NULL},
 323         {SR_MQFLAG_FOUR_WIRE, 0, "four_wire", "4-Wire", NULL},
 324         ALL_ZERO
 325 };
 326
 327 /* This must handle all the keys from enum sr_datatype (libsigrok.h). */
 328 /** @private */
 329 SR_PRIV const GVariantType *sr_variant_type_get(int datatype)
 330 {
 331         switch (datatype) {
 332         case SR_T_INT32:
 333                 return G_VARIANT_TYPE_INT32;
 334         case SR_T_UINT32:
 335                 return G_VARIANT_TYPE_UINT32;
 336         case SR_T_UINT64:
 337                 return G_VARIANT_TYPE_UINT64;
 338         case SR_T_STRING:
 339                 return G_VARIANT_TYPE_STRING;
 340         case SR_T_BOOL:
 341                 return G_VARIANT_TYPE_BOOLEAN;
 342         case SR_T_FLOAT:
 343                 return G_VARIANT_TYPE_DOUBLE;
 344         case SR_T_RATIONAL_PERIOD:
 345         case SR_T_RATIONAL_VOLT:
 346         case SR_T_UINT64_RANGE:
 347         case SR_T_DOUBLE_RANGE:
 348                 return G_VARIANT_TYPE_TUPLE;
 349         case SR_T_KEYVALUE:
 350                 return G_VARIANT_TYPE_DICTIONARY;
 351         case SR_T_MQ:
 352                 return G_VARIANT_TYPE_TUPLE;
 353         default:
 354                 return NULL;
 355         }
 356 }
 357
 358 /** @private */
 359 SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
 360 {
 361         const struct sr_key_info *info;
 362         const GVariantType *type, *expected;
 363         char *expected_string, *type_string;
 364
 365         info = sr_key_info_get(SR_KEY_CONFIG, key);
 366         if (!info)
 367                 return SR_OK;
 368
 369         expected = sr_variant_type_get(info->datatype);
 370         type = g_variant_get_type(value);
 371         if (!g_variant_type_equal(type, expected)
 372                         && !g_variant_type_is_subtype_of(type, expected)) {
 373                 expected_string = g_variant_type_dup_string(expected);
 374                 type_string = g_variant_type_dup_string(type);
 375                 sr_err("Wrong variant type for key '%s': expected '%s', got '%s'",
 376                         info->name, expected_string, type_string);
 377                 g_free(expected_string);
 378                 g_free(type_string);
 379                 return SR_ERR_ARG;
 380         }
 381
 382         return SR_OK;
 383 }
 384
 385 /**
 386  * Return the list of supported hardware drivers.
 387  *
 388  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
 389  *
 390  * @retval NULL The ctx argument was NULL, or there are no supported drivers.
 391  * @retval Other Pointer to the NULL-terminated list of hardware drivers.
 392  *               The user should NOT g_free() this list, sr_exit() will do that.
 393  *
 394  * @since 0.4.0
 395  */
 396 SR_API struct sr_dev_driver **sr_driver_list(const struct sr_context *ctx)
 397 {
 398         if (!ctx)
 399                 return NULL;
 400
 401         return ctx->driver_list;
 402 }
 403
 404 /**
 405  * Initialize a hardware driver.
 406  *
 407  * This usually involves memory allocations and variable initializations
 408  * within the driver, but _not_ scanning for attached devices.
 409  * The API call sr_driver_scan() is used for that.
 410  *
 411  * @param ctx A libsigrok context object allocated by a previous call to
 412  *            sr_init(). Must not be NULL.
 413  * @param driver The driver to initialize. This must be a pointer to one of
 414  *               the entries returned by sr_driver_list(). Must not be NULL.
 415  *
 416  * @retval SR_OK Success
 417  * @retval SR_ERR_ARG Invalid parameter(s).
 418  * @retval SR_ERR_BUG Internal errors.
 419  * @retval other Another negative error code upon other errors.
 420  *
 421  * @since 0.2.0
 422  */
 423 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
 424 {
 425         int ret;
 426
 427         if (!ctx) {
 428                 sr_err("Invalid libsigrok context, can't initialize.");
 429                 return SR_ERR_ARG;
 430         }
 431
 432         if (!driver) {
 433                 sr_err("Invalid driver, can't initialize.");
 434                 return SR_ERR_ARG;
 435         }
 436
 437         /* No log message here, too verbose and not very useful. */
 438
 439         if ((ret = driver->init(driver, ctx)) < 0)
 440                 sr_err("Failed to initialize the driver: %d.", ret);
 441
 442         return ret;
 443 }
 444
 445 /**
 446  * Enumerate scan options supported by this driver.
 447  *
 448  * Before calling sr_driver_scan_options_list(), the user must have previously
 449  * initialized the driver by calling sr_driver_init().
 450  *
 451  * @param driver The driver to enumerate options for. This must be a pointer
 452  *               to one of the entries returned by sr_driver_list(). Must not
 453  *               be NULL.
 454  *
 455  * @return A GArray * of uint32_t entries, or NULL on invalid arguments. Each
 456  *         entry is a configuration key that is supported as a scan option.
 457  *         The array must be freed by the caller using g_array_free().
 458  *
 459  * @since 0.4.0
 460  */
 461 SR_API GArray *sr_driver_scan_options_list(const struct sr_dev_driver *driver)
 462 {
 463         GVariant *gvar;
 464         const uint32_t *opts;
 465         gsize num_opts;
 466         GArray *result;
 467
 468         if (sr_config_list(driver, NULL, NULL, SR_CONF_SCAN_OPTIONS, &gvar) != SR_OK)
 469                 return NULL;
 470
 471         opts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(uint32_t));
 472
 473         result = g_array_sized_new(FALSE, FALSE, sizeof(uint32_t), num_opts);
 474
 475         g_array_insert_vals(result, 0, opts, num_opts);
 476
 477         g_variant_unref(gvar);
 478
 479         return result;
 480 }
 481
 482 static int check_options(struct sr_dev_driver *driver, GSList *options,
 483                 uint32_t optlist_key, struct sr_dev_inst *sdi,
 484                 struct sr_channel_group *cg)
 485 {
 486         struct sr_config *src;
 487         const struct sr_key_info *srci;
 488         GVariant *gvar_opts;
 489         GSList *l;
 490         const uint32_t *opts;
 491         gsize num_opts, i;
 492         int ret;
 493
 494         if (sr_config_list(driver, sdi, cg, optlist_key, &gvar_opts) != SR_OK) {
 495                 /* Driver publishes no options for this optlist. */
 496                 return SR_ERR;
 497         }
 498
 499         ret = SR_OK;
 500         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
 501         for (l = options; l; l = l->next) {
 502                 src = l->data;
 503                 for (i = 0; i < num_opts; i++) {
 504                         if (opts[i] == src->key)
 505                                 break;
 506                 }
 507                 if (i == num_opts) {
 508                         if (!(srci = sr_key_info_get(SR_KEY_CONFIG, src->key)))
 509                                 /* Shouldn't happen. */
 510                                 sr_err("Invalid option %d.", src->key);
 511                         else
 512                                 sr_err("Invalid option '%s'.", srci->id);
 513                         ret = SR_ERR_ARG;
 514                         break;
 515                 }
 516                 if (sr_variant_type_check(src->key, src->data) != SR_OK) {
 517                         ret = SR_ERR_ARG;
 518                         break;
 519                 }
 520         }
 521         g_variant_unref(gvar_opts);
 522
 523         return ret;
 524 }
 525
 526 /**
 527  * Tell a hardware driver to scan for devices.
 528  *
 529  * In addition to the detection, the devices that are found are also
 530  * initialized automatically. On some devices, this involves a firmware upload,
 531  * or other such measures.
 532  *
 533  * The order in which the system is scanned for devices is not specified. The
 534  * caller should not assume or rely on any specific order.
 535  *
 536  * Before calling sr_driver_scan(), the user must have previously initialized
 537  * the driver by calling sr_driver_init().
 538  *
 539  * @param driver The driver that should scan. This must be a pointer to one of
 540  *               the entries returned by sr_driver_list(). Must not be NULL.
 541  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
 542  *                scanner. Can be NULL/empty.
 543  *
 544  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
 545  *         found (or errors were encountered). This list must be freed by the
 546  *         caller using g_slist_free(), but without freeing the data pointed
 547  *         to in the list.
 548  *
 549  * @since 0.2.0
 550  */
 551 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
 552 {
 553         GSList *l;
 554
 555         if (!driver) {
 556                 sr_err("Invalid driver, can't scan for devices.");
 557                 return NULL;
 558         }
 559
 560         if (!driver->context) {
 561                 sr_err("Driver not initialized, can't scan for devices.");
 562                 return NULL;
 563         }
 564
 565         if (options) {
 566                 if (check_options(driver, options, SR_CONF_SCAN_OPTIONS, NULL, NULL) != SR_OK)
 567                         return NULL;
 568         }
 569
 570         l = driver->scan(driver, options);
 571
 572         sr_spew("Scan found %d devices (%s).", g_slist_length(l), driver->name);
 573
 574         return l;
 575 }
 576
 577 /**
 578  * Call driver cleanup function for all drivers.
 579  *
 580  * @param[in] ctx Pointer to a libsigrok context struct. Must not be NULL.
 581  *
 582  * @private
 583  */
 584 SR_PRIV void sr_hw_cleanup_all(const struct sr_context *ctx)
 585 {
 586         int i;
 587         struct sr_dev_driver **drivers;
 588
 589         if (!ctx)
 590                 return;
 591
 592         sr_dbg("Cleaning up all drivers.");
 593
 594         drivers = sr_driver_list(ctx);
 595         for (i = 0; drivers[i]; i++) {
 596                 if (drivers[i]->cleanup)
 597                         drivers[i]->cleanup(drivers[i]);
 598                 drivers[i]->context = NULL;
 599         }
 600 }
 601
 602 /**
 603  * Allocate struct sr_config.
 604  *
 605  * A floating reference can be passed in for data.
 606  *
 607  * @param key The config key to use.
 608  * @param data The GVariant data to use.
 609  *
 610  * @return The newly allocated struct sr_config. This function is assumed
 611  *         to never fail.
 612  *
 613  * @private
 614  */
 615 SR_PRIV struct sr_config *sr_config_new(uint32_t key, GVariant *data)
 616 {
 617         struct sr_config *src;
 618
 619         src = g_malloc0(sizeof(struct sr_config));
 620         src->key = key;
 621         src->data = g_variant_ref_sink(data);
 622
 623         return src;
 624 }
 625
 626 /**
 627  * Free struct sr_config.
 628  *
 629  * @private
 630  */
 631 SR_PRIV void sr_config_free(struct sr_config *src)
 632 {
 633         if (!src || !src->data) {
 634                 sr_err("%s: invalid data!", __func__);
 635                 return;
 636         }
 637
 638         g_variant_unref(src->data);
 639         g_free(src);
 640 }
 641
 642 /** @private */
 643 SR_PRIV int sr_dev_acquisition_start(struct sr_dev_inst *sdi)
 644 {
 645         if (!sdi || !sdi->driver) {
 646                 sr_err("%s: Invalid arguments.", __func__);
 647                 return SR_ERR_ARG;
 648         }
 649
 650         if (sdi->status != SR_ST_ACTIVE) {
 651                 sr_err("%s: Device instance not active, can't start.",
 652                         sdi->driver->name);
 653                 return SR_ERR_DEV_CLOSED;
 654         }
 655
 656         sr_dbg("%s: Starting acquisition.", sdi->driver->name);
 657
 658         return sdi->driver->dev_acquisition_start(sdi);
 659 }
 660
 661 /** @private */
 662 SR_PRIV int sr_dev_acquisition_stop(struct sr_dev_inst *sdi)
 663 {
 664         if (!sdi || !sdi->driver) {
 665                 sr_err("%s: Invalid arguments.", __func__);
 666                 return SR_ERR_ARG;
 667         }
 668
 669         if (sdi->status != SR_ST_ACTIVE) {
 670                 sr_err("%s: Device instance not active, can't stop.",
 671                         sdi->driver->name);
 672                 return SR_ERR_DEV_CLOSED;
 673         }
 674
 675         sr_dbg("%s: Stopping acquisition.", sdi->driver->name);
 676
 677         return sdi->driver->dev_acquisition_stop(sdi);
 678 }
 679
 680 static void log_key(const struct sr_dev_inst *sdi,
 681         const struct sr_channel_group *cg, uint32_t key, unsigned int op,
 682         GVariant *data)
 683 {
 684         const char *opstr;
 685         const struct sr_key_info *srci;
 686         gchar *tmp_str;
 687
 688         /* Don't log SR_CONF_DEVICE_OPTIONS, it's verbose and not too useful. */
 689         if (key == SR_CONF_DEVICE_OPTIONS)
 690                 return;
 691
 692         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
 693         srci = sr_key_info_get(SR_KEY_CONFIG, key);
 694
 695         tmp_str = g_variant_print(data, TRUE);
 696         sr_spew("sr_config_%s(): key %d (%s) sdi %p cg %s -> %s", opstr, key,
 697                 srci ? srci->id : "NULL", sdi, cg ? cg->name : "NULL",
 698                 data ? tmp_str : "NULL");
 699         g_free(tmp_str);
 700 }
 701
 702 static int check_key(const struct sr_dev_driver *driver,
 703                 const struct sr_dev_inst *sdi, const struct sr_channel_group *cg,
 704                 uint32_t key, unsigned int op, GVariant *data)
 705 {
 706         const struct sr_key_info *srci;
 707         gsize num_opts, i;
 708         GVariant *gvar_opts;
 709         const uint32_t *opts;
 710         uint32_t pub_opt;
 711         const char *suffix;
 712         const char *opstr;
 713
 714         if (sdi && cg)
 715                 suffix = " for this device instance and channel group";
 716         else if (sdi)
 717                 suffix = " for this device instance";
 718         else
 719                 suffix = "";
 720
 721         if (!(srci = sr_key_info_get(SR_KEY_CONFIG, key))) {
 722                 sr_err("Invalid key %d.", key);
 723                 return SR_ERR_ARG;
 724         }
 725         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
 726
 727         switch (key) {
 728         case SR_CONF_LIMIT_MSEC:
 729         case SR_CONF_LIMIT_SAMPLES:
 730         case SR_CONF_SAMPLERATE:
 731                 /* Setting any of these to 0 is not useful. */
 732                 if (op != SR_CONF_SET || !data)
 733                         break;
 734                 if (g_variant_get_uint64(data) == 0) {
 735                         sr_err("Cannot set '%s' to 0.", srci->id);
 736                         return SR_ERR_ARG;
 737                 }
 738                 break;
 739         case SR_CONF_CAPTURE_RATIO:
 740                 /* Capture ratio must always be between 0 and 100. */
 741                 if (op != SR_CONF_SET || !data)
 742                         break;
 743                 if (g_variant_get_uint64(data) > 100) {
 744                         sr_err("Capture ratio must be 0..100.");
 745                         return SR_ERR_ARG;
 746                 }
 747                 break;
 748         }
 749
 750         if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS, &gvar_opts) != SR_OK) {
 751                 /* Driver publishes no options. */
 752                 sr_err("No options available%s.", suffix);
 753                 return SR_ERR_ARG;
 754         }
 755         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
 756         pub_opt = 0;
 757         for (i = 0; i < num_opts; i++) {
 758                 if ((opts[i] & SR_CONF_MASK) == key) {
 759                         pub_opt = opts[i];
 760                         break;
 761                 }
 762         }
 763         g_variant_unref(gvar_opts);
 764         if (!pub_opt) {
 765                 sr_err("Option '%s' not available%s.", srci->id, suffix);
 766                 return SR_ERR_ARG;
 767         }
 768
 769         if (!(pub_opt & op)) {
 770                 sr_err("Option '%s' not available to %s%s.", srci->id, opstr, suffix);
 771                 return SR_ERR_ARG;
 772         }
 773
 774         return SR_OK;
 775 }
 776
 777 /**
 778  * Query value of a configuration key at the given driver or device instance.
 779  *
 780  * @param[in] driver The sr_dev_driver struct to query. Must not be NULL.
 781  * @param[in] sdi (optional) If the key is specific to a device, this must
 782  *            contain a pointer to the struct sr_dev_inst to be checked.
 783  *            Otherwise it must be NULL. If sdi is != NULL, sdi->priv must
 784  *            also be != NULL.
 785  * @param[in] cg The channel group on the device for which to list the
 786  *               values, or NULL.
 787  * @param[in] key The configuration key (SR_CONF_*).
 788  * @param[in,out] data Pointer to a GVariant where the value will be stored.
 789  *             Must not be NULL. The caller is given ownership of the GVariant
 790  *             and must thus decrease the refcount after use. However if
 791  *             this function returns an error code, the field should be
 792  *             considered unused, and should not be unreferenced.
 793  *
 794  * @retval SR_OK Success.
 795  * @retval SR_ERR Error.
 796  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 797  *         interpreted as an error by the caller; merely as an indication
 798  *         that it's not applicable.
 799  *
 800  * @since 0.3.0
 801  */
 802 SR_API int sr_config_get(const struct sr_dev_driver *driver,
 803                 const struct sr_dev_inst *sdi,
 804                 const struct sr_channel_group *cg,
 805                 uint32_t key, GVariant **data)
 806 {
 807         int ret;
 808
 809         if (!driver || !data)
 810                 return SR_ERR;
 811
 812         if (!driver->config_get)
 813                 return SR_ERR_ARG;
 814
 815         if (check_key(driver, sdi, cg, key, SR_CONF_GET, NULL) != SR_OK)
 816                 return SR_ERR_ARG;
 817
 818         if (sdi && !sdi->priv) {
 819                 sr_err("Can't get config (sdi != NULL, sdi->priv == NULL).");
 820                 return SR_ERR;
 821         }
 822
 823         if ((ret = driver->config_get(key, data, sdi, cg)) == SR_OK) {
 824                 log_key(sdi, cg, key, SR_CONF_GET, *data);
 825                 /* Got a floating reference from the driver. Sink it here,
 826                  * caller will need to unref when done with it. */
 827                 g_variant_ref_sink(*data);
 828         }
 829
 830         if (ret == SR_ERR_CHANNEL_GROUP)
 831                 sr_err("%s: No channel group specified.",
 832                         (sdi) ? sdi->driver->name : "unknown");
 833
 834         return ret;
 835 }
 836
 837 /**
 838  * Set value of a configuration key in a device instance.
 839  *
 840  * @param[in] sdi The device instance. Must not be NULL. sdi->driver and
 841  *                sdi->priv must not be NULL either.
 842  * @param[in] cg The channel group on the device for which to list the
 843  *                    values, or NULL.
 844  * @param[in] key The configuration key (SR_CONF_*).
 845  * @param data The new value for the key, as a GVariant with GVariantType
 846  *        appropriate to that key. A floating reference can be passed
 847  *        in; its refcount will be sunk and unreferenced after use.
 848  *
 849  * @retval SR_OK Success.
 850  * @retval SR_ERR Error.
 851  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 852  *         interpreted as an error by the caller; merely as an indication
 853  *         that it's not applicable.
 854  *
 855  * @since 0.3.0
 856  */
 857 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
 858                 const struct sr_channel_group *cg,
 859                 uint32_t key, GVariant *data)
 860 {
 861         int ret;
 862
 863         g_variant_ref_sink(data);
 864
 865         if (!sdi || !sdi->driver || !sdi->priv || !data)
 866                 ret = SR_ERR;
 867         else if (!sdi->driver->config_set)
 868                 ret = SR_ERR_ARG;
 869         else if (sdi->status != SR_ST_ACTIVE) {
 870                 sr_err("%s: Device instance not active, can't set config.",
 871                         sdi->driver->name);
 872                 ret = SR_ERR_DEV_CLOSED;
 873         } else if (check_key(sdi->driver, sdi, cg, key, SR_CONF_SET, data) != SR_OK)
 874                 return SR_ERR_ARG;
 875         else if ((ret = sr_variant_type_check(key, data)) == SR_OK) {
 876                 log_key(sdi, cg, key, SR_CONF_SET, data);
 877                 ret = sdi->driver->config_set(key, data, sdi, cg);
 878         }
 879
 880         g_variant_unref(data);
 881
 882         if (ret == SR_ERR_CHANNEL_GROUP)
 883                 sr_err("%s: No channel group specified.",
 884                         (sdi) ? sdi->driver->name : "unknown");
 885
 886         return ret;
 887 }
 888
 889 /**
 890  * Apply configuration settings to the device hardware.
 891  *
 892  * @param sdi The device instance.
 893  *
 894  * @return SR_OK upon success or SR_ERR in case of error.
 895  *
 896  * @since 0.3.0
 897  */
 898 SR_API int sr_config_commit(const struct sr_dev_inst *sdi)
 899 {
 900         int ret;
 901
 902         if (!sdi || !sdi->driver)
 903                 ret = SR_ERR;
 904         else if (!sdi->driver->config_commit)
 905                 ret = SR_OK;
 906         else if (sdi->status != SR_ST_ACTIVE) {
 907                 sr_err("%s: Device instance not active, can't commit config.",
 908                         sdi->driver->name);
 909                 ret = SR_ERR_DEV_CLOSED;
 910         } else
 911                 ret = sdi->driver->config_commit(sdi);
 912
 913         return ret;
 914 }
 915
 916 /**
 917  * List all possible values for a configuration key.
 918  *
 919  * @param[in] driver The sr_dev_driver struct to query. Must not be NULL.
 920  * @param[in] sdi (optional) If the key is specific to a device instance, this
 921  *            must contain a pointer to the struct sr_dev_inst to be checked.
 922  *            Otherwise it must be NULL. If sdi is != NULL, sdi->priv must
 923  *            also be != NULL.
 924  * @param[in] cg The channel group on the device instance for which to list
 925  *            the values, or NULL. If this device instance doesn't
 926  *            have channel groups, this must not be != NULL.
 927  *            If cg is NULL, this function will return the "common" device
 928  *            instance options that are channel-group independent. Otherwise
 929  *            it will return the channel-group specific options.
 930  * @param[in] key The configuration key (SR_CONF_*).
 931  * @param[in,out] data A pointer to a GVariant where the list will be stored.
 932  *                The caller is given ownership of the GVariant and must thus
 933  *                unref the GVariant after use. However if this function
 934  *                returns an error code, the field should be considered
 935  *                unused, and should not be unreferenced.
 936  *
 937  * @retval SR_OK Success.
 938  * @retval SR_ERR Error.
 939  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
 940  *         interpreted as an error by the caller; merely as an indication
 941  *         that it's not applicable.
 942  *
 943  * @since 0.3.0
 944  */
 945 SR_API int sr_config_list(const struct sr_dev_driver *driver,
 946                 const struct sr_dev_inst *sdi,
 947                 const struct sr_channel_group *cg,
 948                 uint32_t key, GVariant **data)
 949 {
 950         int ret;
 951
 952         if (!driver || !data)
 953                 return SR_ERR;
 954
 955         if (!driver->config_list)
 956                 return SR_ERR_ARG;
 957
 958         if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS) {
 959                 if (check_key(driver, sdi, cg, key, SR_CONF_LIST, NULL) != SR_OK)
 960                         return SR_ERR_ARG;
 961         }
 962
 963         if (sdi && !sdi->priv) {
 964                 sr_err("Can't list config (sdi != NULL, sdi->priv == NULL).");
 965                 return SR_ERR;
 966         }
 967
 968         if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS && !sdi) {
 969                 sr_err("Config keys other than SR_CONF_SCAN_OPTIONS and "
 970                        "SR_CONF_DEVICE_OPTIONS always need an sdi.");
 971                 return SR_ERR_ARG;
 972         }
 973
 974         if (cg && sdi && !sdi->channel_groups) {
 975                 sr_err("Can't list config for channel group, there are none.");
 976                 return SR_ERR_ARG;
 977         }
 978
 979         if (cg && sdi && !g_slist_find(sdi->channel_groups, cg)) {
 980                 sr_err("If a channel group is specified, it must be a valid one.");
 981                 return SR_ERR_ARG;
 982         }
 983
 984         if (cg && !sdi) {
 985                 sr_err("Need sdi when a channel group is specified.");
 986                 return SR_ERR_ARG;
 987         }
 988
 989         if ((ret = driver->config_list(key, data, sdi, cg)) == SR_OK) {
 990                 log_key(sdi, cg, key, SR_CONF_LIST, *data);
 991                 g_variant_ref_sink(*data);
 992         }
 993
 994         if (ret == SR_ERR_CHANNEL_GROUP)
 995                 sr_err("%s: No channel group specified.",
 996                         (sdi) ? sdi->driver->name : "unknown");
 997
 998         return ret;
 999 }
1000
1001 static struct sr_key_info *get_keytable(int keytype)
1002 {
1003         struct sr_key_info *table;
1004
1005         switch (keytype) {
1006         case SR_KEY_CONFIG:
1007                 table = sr_key_info_config;
1008                 break;
1009         case SR_KEY_MQ:
1010                 table = sr_key_info_mq;
1011                 break;
1012         case SR_KEY_MQFLAGS:
1013                 table = sr_key_info_mqflag;
1014                 break;
1015         default:
1016                 sr_err("Invalid keytype %d", keytype);
1017                 return NULL;
1018         }
1019
1020         return table;
1021 }
1022
1023 /**
1024  * Get information about a key, by key.
1025  *
1026  * @param[in] keytype The namespace the key is in.
1027  * @param[in] key The key to find.
1028  *
1029  * @return A pointer to a struct sr_key_info, or NULL if the key
1030  *         was not found.
1031  *
1032  * @since 0.3.0
1033  */
1034 SR_API const struct sr_key_info *sr_key_info_get(int keytype, uint32_t key)
1035 {
1036         struct sr_key_info *table;
1037         int i;
1038
1039         if (!(table = get_keytable(keytype)))
1040                 return NULL;
1041
1042         for (i = 0; table[i].key; i++) {
1043                 if (table[i].key == key)
1044                         return &table[i];
1045         }
1046
1047         return NULL;
1048 }
1049
1050 /**
1051  * Get information about a key, by name.
1052  *
1053  * @param[in] keytype The namespace the key is in.
1054  * @param[in] keyid The key id string.
1055  *
1056  * @return A pointer to a struct sr_key_info, or NULL if the key
1057  *         was not found.
1058  *
1059  * @since 0.2.0
1060  */
1061 SR_API const struct sr_key_info *sr_key_info_name_get(int keytype, const char *keyid)
1062 {
1063         struct sr_key_info *table;
1064         int i;
1065
1066         if (!(table = get_keytable(keytype)))
1067                 return NULL;
1068
1069         for (i = 0; table[i].key; i++) {
1070                 if (!table[i].id)
1071                         continue;
1072                 if (!strcmp(table[i].id, keyid))
1073                         return &table[i];
1074         }
1075
1076         return NULL;
1077 }
1078
1079 /** @} */