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