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1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <sys/types.h>
23 #include <dirent.h>
24 #include <string.h>
25 #include <glib.h>
26 #include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
27 #include "libsigrok.h"
28 #include "libsigrok-internal.h"
29
30 /** @cond PRIVATE */
31 #define LOG_PREFIX "hwdriver"
32 /** @endcond */
33
34 extern SR_PRIV struct sr_dev_driver *drivers_list[];
35
36 /**
37  * @file
38  *
39  * Hardware driver handling in libsigrok.
40  */
41
42 /**
43  * @defgroup grp_driver Hardware drivers
44  *
45  * Hardware driver handling in libsigrok.
46  *
47  * @{
48  */
49
50 /* Same key order/grouping as in enum sr_configkey (libsigrok.h). */
51 static struct sr_config_info sr_config_info_data[] = {
52         /* Device classes */
53         {SR_CONF_LOGIC_ANALYZER, SR_T_STRING, NULL, "Logic analyzer", NULL},
54         {SR_CONF_OSCILLOSCOPE, SR_T_STRING, NULL, "Oscilloscope", NULL},
55         {SR_CONF_MULTIMETER, SR_T_STRING, NULL, "Multimeter", NULL},
56         {SR_CONF_DEMO_DEV, SR_T_STRING, NULL, "Demo device", NULL},
57         {SR_CONF_SOUNDLEVELMETER, SR_T_STRING, NULL, "Sound level meter", NULL},
58         {SR_CONF_THERMOMETER, SR_T_STRING, NULL, "Thermometer", NULL},
59         {SR_CONF_HYGROMETER, SR_T_STRING, NULL, "Hygrometer", NULL},
60         {SR_CONF_ENERGYMETER, SR_T_STRING, NULL, "Energy meter", NULL},
61         {SR_CONF_DEMODULATOR, SR_T_STRING, NULL, "Demodulator", NULL},
62         {SR_CONF_POWER_SUPPLY, SR_T_STRING, NULL, "Power supply", NULL},
63         {SR_CONF_LCRMETER, SR_T_STRING, NULL, "LCR meter", NULL},
64
65         /* Driver scan options */
66         {SR_CONF_CONN, SR_T_STRING, "conn",
67                 "Connection", NULL},
68         {SR_CONF_SERIALCOMM, SR_T_STRING, "serialcomm",
69                 "Serial communication", NULL},
70
71         /* Device (or channel group) configuration */
72         {SR_CONF_SAMPLERATE, SR_T_UINT64, "samplerate",
73                 "Sample rate", NULL},
74         {SR_CONF_CAPTURE_RATIO, SR_T_UINT64, "captureratio",
75                 "Pre-trigger capture ratio", NULL},
76         {SR_CONF_PATTERN_MODE, SR_T_STRING, "pattern",
77                 "Pattern", NULL},
78         {SR_CONF_RLE, SR_T_BOOL, "rle",
79                 "Run length encoding", NULL},
80         {SR_CONF_TRIGGER_SLOPE, SR_T_STRING, "triggerslope",
81                 "Trigger slope", NULL},
82         {SR_CONF_TRIGGER_SOURCE, SR_T_STRING, "triggersource",
83                 "Trigger source", NULL},
84         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
85                 "Horizontal trigger position", NULL},
86         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
87                 "Buffer size", NULL},
88         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
89                 "Time base", NULL},
90         {SR_CONF_FILTER, SR_T_BOOL, "filter",
91                 "Filter", NULL},
92         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
93                 "Volts/div", NULL},
94         {SR_CONF_COUPLING, SR_T_STRING, "coupling",
95                 "Coupling", NULL},
96         {SR_CONF_TRIGGER_MATCH, SR_T_INT32, "triggermatch",
97                 "Trigger matches", NULL},
98         {SR_CONF_SAMPLE_INTERVAL, SR_T_UINT64, "sample_interval",
99                 "Sample interval", NULL},
100         {SR_CONF_NUM_TIMEBASE, SR_T_INT32, "num_timebase",
101                 "Number of time bases", NULL},
102         {SR_CONF_NUM_VDIV, SR_T_INT32, "num_vdiv",
103                 "Number of vertical divisions", NULL},
104         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_STRING, "spl_weight_freq",
105                 "Sound pressure level frequency weighting", NULL},
106         {SR_CONF_SPL_WEIGHT_TIME, SR_T_STRING, "spl_weight_time",
107                 "Sound pressure level time weighting", NULL},
108         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
109                 "Sound pressure level measurement range", NULL},
110         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
111                 "Hold max", NULL},
112         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
113                 "Hold min", NULL},
114         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
115                 "Voltage threshold", NULL },
116         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
117                 "External clock mode", NULL},
118         {SR_CONF_SWAP, SR_T_BOOL, "swap",
119                 "Swap channel order", NULL},
120         {SR_CONF_CENTER_FREQUENCY, SR_T_UINT64, "center_frequency",
121                 "Center frequency", NULL},
122         {SR_CONF_NUM_LOGIC_CHANNELS, SR_T_INT32, "logic_channels",
123                 "Number of logic channels", NULL},
124         {SR_CONF_NUM_ANALOG_CHANNELS, SR_T_INT32, "analog_channels",
125                 "Number of analog channels", NULL},
126         {SR_CONF_OUTPUT_VOLTAGE, SR_T_FLOAT, "output_voltage",
127                 "Current output voltage", NULL},
128         {SR_CONF_OUTPUT_VOLTAGE_TARGET, SR_T_FLOAT, "output_voltage_target",
129                 "Output voltage target", NULL},
130         {SR_CONF_OUTPUT_CURRENT, SR_T_FLOAT, "output_current",
131                 "Current output current", NULL},
132         {SR_CONF_OUTPUT_CURRENT_LIMIT, SR_T_FLOAT, "output_current_limit",
133                 "Output current limit", NULL},
134         {SR_CONF_OUTPUT_ENABLED, SR_T_BOOL, "output_enabled",
135                 "Output enabled", NULL},
136         {SR_CONF_OUTPUT_CHANNEL_CONFIG, SR_T_STRING, "output_channel_config",
137                 "Output channel modes", NULL},
138         {SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED, SR_T_BOOL, "ovp_enabled",
139                 "Over-voltage protection enabled", NULL},
140         {SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE, SR_T_BOOL, "ovp_active",
141                 "Over-voltage protection active", NULL},
142         {SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD, SR_T_FLOAT, "ovp_threshold",
143                 "Over-voltage protection threshold", NULL},
144         {SR_CONF_OVER_CURRENT_PROTECTION_ENABLED, SR_T_BOOL, "ocp_enabled",
145                 "Over-current protection enabled", NULL},
146         {SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE, SR_T_BOOL, "ocp_active",
147                 "Over-current protection active", NULL},
148         {SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD, SR_T_FLOAT, "ocp_threshold",
149                 "Over-current protection threshold", NULL},
150         {SR_CONF_CLOCK_EDGE, SR_T_STRING, "clock_edge",
151                 "Clock edge", NULL},
152         {SR_CONF_AMPLITUDE, SR_T_FLOAT, "amplitude",
153                 "Amplitude", NULL},
154         {SR_CONF_OUTPUT_REGULATION, SR_T_STRING, "output_regulation",
155                 "Output channel regulation", NULL},
156         {SR_CONF_OVER_TEMPERATURE_PROTECTION, SR_T_BOOL, "otp",
157                 "Over-temperature protection", NULL},
158         {SR_CONF_OUTPUT_FREQUENCY, SR_T_UINT64, "output_frequency",
159                 "Output frequency", NULL},
160         {SR_CONF_MEASURED_QUANTITY, SR_T_STRING, "measured_quantity",
161                 "Measured quantity", NULL},
162         {SR_CONF_MEASURED_2ND_QUANTITY, SR_T_STRING, "measured_2nd_quantity",
163                 "Measured secondary quantity", NULL},
164         {SR_CONF_EQUIV_CIRCUIT_MODEL, SR_T_STRING, "equiv_circuit_model",
165                 "Equivalent circuit model", NULL},
166
167         /* Special stuff */
168         {SR_CONF_SCAN_OPTIONS, SR_T_STRING, "scan_options",
169                 "Scan options", NULL},
170         {SR_CONF_DEVICE_OPTIONS, SR_T_STRING, "device_options",
171                 "Device options", NULL},
172         {SR_CONF_SESSIONFILE, SR_T_STRING, "sessionfile",
173                 "Session file", NULL},
174         {SR_CONF_CAPTUREFILE, SR_T_STRING, "capturefile",
175                 "Capture file", NULL},
176         {SR_CONF_CAPTURE_UNITSIZE, SR_T_UINT64, "capture_unitsize",
177                 "Capture unitsize", NULL},
178         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
179                 "Power off", NULL},
180         {SR_CONF_DATA_SOURCE, SR_T_STRING, "data_source",
181                 "Data source", NULL},
182
183         /* Acquisition modes, sample limiting */
184         {SR_CONF_LIMIT_MSEC, SR_T_UINT64, "limit_time",
185                 "Time limit", NULL},
186         {SR_CONF_LIMIT_SAMPLES, SR_T_UINT64, "limit_samples",
187                 "Sample limit", NULL},
188         {SR_CONF_LIMIT_FRAMES, SR_T_UINT64, "limit_frames",
189                 "Frame limit", NULL},
190         {SR_CONF_CONTINUOUS, SR_T_UINT64, "continuous",
191                 "Continuous sampling", NULL},
192         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
193                 "Datalog", NULL},
194         {SR_CONF_DEVICE_MODE, SR_T_STRING, "device_mode",
195                 "Device mode", NULL},
196         {SR_CONF_TEST_MODE, SR_T_STRING, "test_mode",
197                 "Test mode", NULL},
198
199         {0, 0, NULL, NULL, NULL},
200 };
201
202 SR_PRIV const GVariantType *sr_variant_type_get(int datatype)
203 {
204         switch (datatype) {
205         case SR_T_INT32:
206                 return G_VARIANT_TYPE_INT32;
207         case SR_T_UINT64:
208                 return G_VARIANT_TYPE_UINT64;
209         case SR_T_STRING:
210                 return G_VARIANT_TYPE_STRING;
211         case SR_T_BOOL:
212                 return G_VARIANT_TYPE_BOOLEAN;
213         case SR_T_FLOAT:
214                 return G_VARIANT_TYPE_DOUBLE;
215         case SR_T_RATIONAL_PERIOD:
216         case SR_T_RATIONAL_VOLT:
217         case SR_T_UINT64_RANGE:
218         case SR_T_DOUBLE_RANGE:
219                 return G_VARIANT_TYPE_TUPLE;
220         case SR_T_KEYVALUE:
221                 return G_VARIANT_TYPE_DICTIONARY;
222         default:
223                 return NULL;
224         }
225 }
226
227 SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
228 {
229         const struct sr_config_info *info;
230         const GVariantType *type, *expected;
231         char *expected_string, *type_string;
232
233         info = sr_config_info_get(key);
234         if (!info)
235                 return SR_OK;
236
237         expected = sr_variant_type_get(info->datatype);
238         type = g_variant_get_type(value);
239         if (!g_variant_type_equal(type, expected)
240                         && !g_variant_type_is_subtype_of(type, expected)) {
241                 expected_string = g_variant_type_dup_string(expected);
242                 type_string = g_variant_type_dup_string(type);
243                 sr_err("Wrong variant type for key '%s': expected '%s', got '%s'",
244                         info->name, expected_string, type_string);
245                 g_free(expected_string);
246                 g_free(type_string);
247                 return SR_ERR_ARG;
248         }
249
250         return SR_OK;
251 }
252
253 /**
254  * Return the list of supported hardware drivers.
255  *
256  * @return Pointer to the NULL-terminated list of hardware driver pointers.
257  *
258  * @since 0.1.0
259  */
260 SR_API struct sr_dev_driver **sr_driver_list(void)
261 {
262
263         return drivers_list;
264 }
265
266 /**
267  * Initialize a hardware driver.
268  *
269  * This usually involves memory allocations and variable initializations
270  * within the driver, but _not_ scanning for attached devices.
271  * The API call sr_driver_scan() is used for that.
272  *
273  * @param ctx A libsigrok context object allocated by a previous call to
274  *            sr_init(). Must not be NULL.
275  * @param driver The driver to initialize. This must be a pointer to one of
276  *               the entries returned by sr_driver_list(). Must not be NULL.
277  *
278  * @retval SR_OK Success
279  * @retval SR_ERR_ARG Invalid parameter(s).
280  * @retval SR_ERR_BUG Internal errors.
281  * @retval other Another negative error code upon other errors.
282  *
283  * @since 0.2.0
284  */
285 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
286 {
287         int ret;
288
289         if (!ctx) {
290                 sr_err("Invalid libsigrok context, can't initialize.");
291                 return SR_ERR_ARG;
292         }
293
294         if (!driver) {
295                 sr_err("Invalid driver, can't initialize.");
296                 return SR_ERR_ARG;
297         }
298
299         sr_spew("Initializing driver '%s'.", driver->name);
300         if ((ret = driver->init(ctx)) < 0)
301                 sr_err("Failed to initialize the driver: %d.", ret);
302
303         return ret;
304 }
305
306 static int check_options(struct sr_dev_driver *driver, GSList *options,
307                 uint32_t optlist_key, struct sr_dev_inst *sdi,
308                 struct sr_channel_group *cg)
309 {
310         struct sr_config *src;
311         const struct sr_config_info *srci;
312         GVariant *gvar_opts;
313         GSList *l;
314         const uint32_t *opts;
315         gsize num_opts, i;
316         int ret;
317
318         if (sr_config_list(driver, sdi, cg, optlist_key, &gvar_opts) != SR_OK) {
319                 /* Driver publishes no options for this optlist. */
320                 return SR_ERR;
321         }
322
323         ret = SR_OK;
324         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
325         for (l = options; l; l = l->next) {
326                 src = l->data;
327                 for (i = 0; i < num_opts; i++) {
328                         if (opts[i] == src->key)
329                                 break;
330                 }
331                 if (i == num_opts) {
332                         if (!(srci = sr_config_info_get(src->key)))
333                                 /* Shouldn't happen. */
334                                 sr_err("Invalid option %d.", src->key);
335                         else
336                                 sr_err("Invalid option '%s'.", srci->id);
337                         ret = SR_ERR_ARG;
338                         break;
339                 }
340                 if (sr_variant_type_check(src->key, src->data) != SR_OK) {
341                         ret = SR_ERR_ARG;
342                         break;
343                 }
344         }
345         g_variant_unref(gvar_opts);
346
347         return ret;
348 }
349
350 /**
351  * Tell a hardware driver to scan for devices.
352  *
353  * In addition to the detection, the devices that are found are also
354  * initialized automatically. On some devices, this involves a firmware upload,
355  * or other such measures.
356  *
357  * The order in which the system is scanned for devices is not specified. The
358  * caller should not assume or rely on any specific order.
359  *
360  * Before calling sr_driver_scan(), the user must have previously initialized
361  * the driver by calling sr_driver_init().
362  *
363  * @param driver The driver that should scan. This must be a pointer to one of
364  *               the entries returned by sr_driver_list(). Must not be NULL.
365  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
366  *                scanner. Can be NULL/empty.
367  *
368  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
369  *         found (or errors were encountered). This list must be freed by the
370  *         caller using g_slist_free(), but without freeing the data pointed
371  *         to in the list.
372  *
373  * @since 0.2.0
374  */
375 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
376 {
377         GSList *l;
378
379         if (!driver) {
380                 sr_err("Invalid driver, can't scan for devices.");
381                 return NULL;
382         }
383
384         if (!driver->priv) {
385                 sr_err("Driver not initialized, can't scan for devices.");
386                 return NULL;
387         }
388
389         if (options) {
390                 if (check_options(driver, options, SR_CONF_SCAN_OPTIONS, NULL, NULL) != SR_OK)
391                         return NULL;
392         }
393
394         l = driver->scan(options);
395
396         sr_spew("Scan of '%s' found %d devices.", driver->name,
397                 g_slist_length(l));
398
399         return l;
400 }
401
402 /** Call driver cleanup function for all drivers.
403  *  @private */
404 SR_PRIV void sr_hw_cleanup_all(void)
405 {
406         int i;
407         struct sr_dev_driver **drivers;
408
409         drivers = sr_driver_list();
410         for (i = 0; drivers[i]; i++) {
411                 if (drivers[i]->cleanup)
412                         drivers[i]->cleanup();
413         }
414 }
415
416 /** Allocate struct sr_config.
417  *  A floating reference can be passed in for data.
418  *  @private
419  */
420 SR_PRIV struct sr_config *sr_config_new(uint32_t key, GVariant *data)
421 {
422         struct sr_config *src;
423
424         src = g_malloc0(sizeof(struct sr_config));
425         src->key = key;
426         src->data = g_variant_ref_sink(data);
427
428         return src;
429 }
430
431 /** Free struct sr_config.
432  *  @private
433  */
434 SR_PRIV void sr_config_free(struct sr_config *src)
435 {
436
437         if (!src || !src->data) {
438                 sr_err("%s: invalid data!", __func__);
439                 return;
440         }
441
442         g_variant_unref(src->data);
443         g_free(src);
444
445 }
446
447 static int check_key(const struct sr_dev_driver *driver,
448                 const struct sr_dev_inst *sdi, const struct sr_channel_group *cg,
449                 uint32_t key, int op)
450 {
451         const struct sr_config_info *srci;
452         gsize num_opts, i;
453         GVariant *gvar_opts;
454         const uint32_t *opts;
455         uint32_t pub_opt;
456         char *suffix, *opstr;
457
458         if (sdi && cg)
459                 suffix = " for this device and channel group";
460         else if (sdi)
461                 suffix = " for this device";
462         else
463                 suffix = "";
464
465         if (!(srci = sr_config_info_get(key))) {
466                 sr_err("Invalid key %d.", key);
467                 return SR_ERR_ARG;
468         }
469         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
470         sr_spew("sr_config_%s(): key %d (%s) sdi %p cg %s", opstr, key,
471                         srci->id, sdi, cg ? cg->name : "NULL");
472
473         if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS, &gvar_opts) != SR_OK) {
474                 /* Driver publishes no options. */
475                 sr_err("No options available%s.", srci->id, suffix);
476                 return SR_ERR_ARG;
477         }
478         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
479         pub_opt = 0;
480         for (i = 0; i < num_opts; i++) {
481                 if ((opts[i] & SR_CONF_MASK) == key) {
482                         pub_opt = opts[i];
483                         break;
484                 }
485         }
486         g_variant_unref(gvar_opts);
487         if (!pub_opt) {
488                 sr_err("Option '%s' not available%s.", srci->id, suffix);
489                 return SR_ERR_ARG;
490         }
491
492         if (!(pub_opt & op)) {
493                 sr_err("Option '%s' not available to %s%s.", srci->id, opstr, suffix);
494                 return SR_ERR_ARG;
495         }
496
497         return SR_OK;
498 }
499
500 /**
501  * Query value of a configuration key at the given driver or device instance.
502  *
503  * @param[in] driver The sr_dev_driver struct to query.
504  * @param[in] sdi (optional) If the key is specific to a device, this must
505  *            contain a pointer to the struct sr_dev_inst to be checked.
506  *            Otherwise it must be NULL.
507  * @param[in] cg The channel group on the device for which to list the
508  *                    values, or NULL.
509  * @param[in] key The configuration key (SR_CONF_*).
510  * @param[in,out] data Pointer to a GVariant where the value will be stored.
511  *             Must not be NULL. The caller is given ownership of the GVariant
512  *             and must thus decrease the refcount after use. However if
513  *             this function returns an error code, the field should be
514  *             considered unused, and should not be unreferenced.
515  *
516  * @retval SR_OK Success.
517  * @retval SR_ERR Error.
518  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
519  *          interpreted as an error by the caller; merely as an indication
520  *          that it's not applicable.
521  *
522  * @since 0.3.0
523  */
524 SR_API int sr_config_get(const struct sr_dev_driver *driver,
525                 const struct sr_dev_inst *sdi,
526                 const struct sr_channel_group *cg,
527                 uint32_t key, GVariant **data)
528 {
529         int ret;
530
531         if (!driver || !data)
532                 return SR_ERR;
533
534         if (!driver->config_get)
535                 return SR_ERR_ARG;
536
537         if (check_key(driver, sdi, cg, key, SR_CONF_GET) != SR_OK)
538                 return SR_ERR_ARG;
539
540         if ((ret = driver->config_get(key, data, sdi, cg)) == SR_OK) {
541                 /* Got a floating reference from the driver. Sink it here,
542                  * caller will need to unref when done with it. */
543                 g_variant_ref_sink(*data);
544         }
545
546         return ret;
547 }
548
549 /**
550  * Set value of a configuration key in a device instance.
551  *
552  * @param[in] sdi The device instance.
553  * @param[in] cg The channel group on the device for which to list the
554  *                    values, or NULL.
555  * @param[in] key The configuration key (SR_CONF_*).
556  * @param data The new value for the key, as a GVariant with GVariantType
557  *        appropriate to that key. A floating reference can be passed
558  *        in; its refcount will be sunk and unreferenced after use.
559  *
560  * @retval SR_OK Success.
561  * @retval SR_ERR Error.
562  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
563  *          interpreted as an error by the caller; merely as an indication
564  *          that it's not applicable.
565  *
566  * @since 0.3.0
567  */
568 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
569                 const struct sr_channel_group *cg,
570                 uint32_t key, GVariant *data)
571 {
572         int ret;
573
574         g_variant_ref_sink(data);
575
576         if (!sdi || !sdi->driver || !data)
577                 ret = SR_ERR;
578         else if (!sdi->driver->config_set)
579                 ret = SR_ERR_ARG;
580         else if (check_key(sdi->driver, sdi, cg, key, SR_CONF_SET) != SR_OK)
581                 return SR_ERR_ARG;
582         else if ((ret = sr_variant_type_check(key, data)) == SR_OK)
583                 ret = sdi->driver->config_set(key, data, sdi, cg);
584
585         g_variant_unref(data);
586
587         return ret;
588 }
589
590 /**
591  * Apply configuration settings to the device hardware.
592  *
593  * @param sdi The device instance.
594  *
595  * @return SR_OK upon success or SR_ERR in case of error.
596  *
597  * @since 0.3.0
598  */
599 SR_API int sr_config_commit(const struct sr_dev_inst *sdi)
600 {
601         int ret;
602
603         if (!sdi || !sdi->driver)
604                 ret = SR_ERR;
605         else if (!sdi->driver->config_commit)
606                 ret = SR_OK;
607         else
608                 ret = sdi->driver->config_commit(sdi);
609
610         return ret;
611 }
612
613 /**
614  * List all possible values for a configuration key.
615  *
616  * @param[in] driver The sr_dev_driver struct to query.
617  * @param[in] sdi (optional) If the key is specific to a device, this must
618  *            contain a pointer to the struct sr_dev_inst to be checked.
619  * @param[in] cg The channel group on the device for which to list the
620  *                    values, or NULL.
621  * @param[in] key The configuration key (SR_CONF_*).
622  * @param[in,out] data A pointer to a GVariant where the list will be stored.
623  *             The caller is given ownership of the GVariant and must thus
624  *             unref the GVariant after use. However if this function
625  *             returns an error code, the field should be considered
626  *             unused, and should not be unreferenced.
627  *
628  * @retval SR_OK Success.
629  * @retval SR_ERR Error.
630  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
631  *          interpreted as an error by the caller; merely as an indication
632  *          that it's not applicable.
633  *
634  * @since 0.3.0
635  */
636 SR_API int sr_config_list(const struct sr_dev_driver *driver,
637                 const struct sr_dev_inst *sdi,
638                 const struct sr_channel_group *cg,
639                 uint32_t key, GVariant **data)
640 {
641         int ret;
642
643         if (!driver || !data)
644                 return SR_ERR;
645         else if (!driver->config_list)
646                 return SR_ERR_ARG;
647         else if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS) {
648                 if (check_key(driver, sdi, cg, key, SR_CONF_LIST) != SR_OK)
649                         return SR_ERR_ARG;
650         }
651         if ((ret = driver->config_list(key, data, sdi, cg)) == SR_OK)
652                 g_variant_ref_sink(*data);
653
654         return ret;
655 }
656
657 /**
658  * Get information about a configuration key, by key.
659  *
660  * @param[in] key The configuration key.
661  *
662  * @return A pointer to a struct sr_config_info, or NULL if the key
663  *         was not found.
664  *
665  * @since 0.2.0
666  */
667 SR_API const struct sr_config_info *sr_config_info_get(uint32_t key)
668 {
669         int i;
670
671         for (i = 0; sr_config_info_data[i].key; i++) {
672                 if (sr_config_info_data[i].key == key)
673                         return &sr_config_info_data[i];
674         }
675
676         return NULL;
677 }
678
679 /**
680  * Get information about a configuration key, by name.
681  *
682  * @param[in] optname The configuration key.
683  *
684  * @return A pointer to a struct sr_config_info, or NULL if the key
685  *         was not found.
686  *
687  * @since 0.2.0
688  */
689 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
690 {
691         int i;
692
693         for (i = 0; sr_config_info_data[i].key; i++) {
694                 if (!sr_config_info_data[i].id)
695                         continue;
696                 if (!strcmp(sr_config_info_data[i].id, optname))
697                         return &sr_config_info_data[i];
698         }
699
700         return NULL;
701 }
702
703 /** @} */