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