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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_lists[];
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_AVERAGING, SR_T_BOOL, "averaging",
83                 "Averaging", NULL},
84         {SR_CONF_AVG_SAMPLES, SR_T_UINT64, "avg_samples",
85                 "Number of samples to average over", NULL},
86         {SR_CONF_TRIGGER_SOURCE, SR_T_STRING, "triggersource",
87                 "Trigger source", NULL},
88         {SR_CONF_HORIZ_TRIGGERPOS, SR_T_FLOAT, "horiz_triggerpos",
89                 "Horizontal trigger position", NULL},
90         {SR_CONF_BUFFERSIZE, SR_T_UINT64, "buffersize",
91                 "Buffer size", NULL},
92         {SR_CONF_TIMEBASE, SR_T_RATIONAL_PERIOD, "timebase",
93                 "Time base", NULL},
94         {SR_CONF_FILTER, SR_T_BOOL, "filter",
95                 "Filter", NULL},
96         {SR_CONF_VDIV, SR_T_RATIONAL_VOLT, "vdiv",
97                 "Volts/div", NULL},
98         {SR_CONF_COUPLING, SR_T_STRING, "coupling",
99                 "Coupling", NULL},
100         {SR_CONF_TRIGGER_MATCH, SR_T_INT32, "triggermatch",
101                 "Trigger matches", NULL},
102         {SR_CONF_SAMPLE_INTERVAL, SR_T_UINT64, "sample_interval",
103                 "Sample interval", NULL},
104         {SR_CONF_NUM_HDIV, SR_T_INT32, "num_hdiv",
105                 "Number of horizontal divisions", NULL},
106         {SR_CONF_NUM_VDIV, SR_T_INT32, "num_vdiv",
107                 "Number of vertical divisions", NULL},
108         {SR_CONF_SPL_WEIGHT_FREQ, SR_T_STRING, "spl_weight_freq",
109                 "Sound pressure level frequency weighting", NULL},
110         {SR_CONF_SPL_WEIGHT_TIME, SR_T_STRING, "spl_weight_time",
111                 "Sound pressure level time weighting", NULL},
112         {SR_CONF_SPL_MEASUREMENT_RANGE, SR_T_UINT64_RANGE, "spl_meas_range",
113                 "Sound pressure level measurement range", NULL},
114         {SR_CONF_HOLD_MAX, SR_T_BOOL, "hold_max",
115                 "Hold max", NULL},
116         {SR_CONF_HOLD_MIN, SR_T_BOOL, "hold_min",
117                 "Hold min", NULL},
118         {SR_CONF_VOLTAGE_THRESHOLD, SR_T_DOUBLE_RANGE, "voltage_threshold",
119                 "Voltage threshold", NULL },
120         {SR_CONF_EXTERNAL_CLOCK, SR_T_BOOL, "external_clock",
121                 "External clock mode", NULL},
122         {SR_CONF_SWAP, SR_T_BOOL, "swap",
123                 "Swap channel order", NULL},
124         {SR_CONF_CENTER_FREQUENCY, SR_T_UINT64, "center_frequency",
125                 "Center frequency", NULL},
126         {SR_CONF_NUM_LOGIC_CHANNELS, SR_T_INT32, "logic_channels",
127                 "Number of logic channels", NULL},
128         {SR_CONF_NUM_ANALOG_CHANNELS, SR_T_INT32, "analog_channels",
129                 "Number of analog channels", NULL},
130         {SR_CONF_OUTPUT_VOLTAGE, SR_T_FLOAT, "output_voltage",
131                 "Current output voltage", NULL},
132         {SR_CONF_OUTPUT_VOLTAGE_TARGET, SR_T_FLOAT, "output_voltage_target",
133                 "Output voltage target", NULL},
134         {SR_CONF_OUTPUT_CURRENT, SR_T_FLOAT, "output_current",
135                 "Current output current", NULL},
136         {SR_CONF_OUTPUT_CURRENT_LIMIT, SR_T_FLOAT, "output_current_limit",
137                 "Output current limit", NULL},
138         {SR_CONF_OUTPUT_ENABLED, SR_T_BOOL, "output_enabled",
139                 "Output enabled", NULL},
140         {SR_CONF_OUTPUT_CHANNEL_CONFIG, SR_T_STRING, "output_channel_config",
141                 "Output channel modes", NULL},
142         {SR_CONF_OVER_VOLTAGE_PROTECTION_ENABLED, SR_T_BOOL, "ovp_enabled",
143                 "Over-voltage protection enabled", NULL},
144         {SR_CONF_OVER_VOLTAGE_PROTECTION_ACTIVE, SR_T_BOOL, "ovp_active",
145                 "Over-voltage protection active", NULL},
146         {SR_CONF_OVER_VOLTAGE_PROTECTION_THRESHOLD, SR_T_FLOAT, "ovp_threshold",
147                 "Over-voltage protection threshold", NULL},
148         {SR_CONF_OVER_CURRENT_PROTECTION_ENABLED, SR_T_BOOL, "ocp_enabled",
149                 "Over-current protection enabled", NULL},
150         {SR_CONF_OVER_CURRENT_PROTECTION_ACTIVE, SR_T_BOOL, "ocp_active",
151                 "Over-current protection active", NULL},
152         {SR_CONF_OVER_CURRENT_PROTECTION_THRESHOLD, SR_T_FLOAT, "ocp_threshold",
153                 "Over-current protection threshold", NULL},
154         {SR_CONF_CLOCK_EDGE, SR_T_STRING, "clock_edge",
155                 "Clock edge", NULL},
156         {SR_CONF_AMPLITUDE, SR_T_FLOAT, "amplitude",
157                 "Amplitude", NULL},
158         {SR_CONF_OUTPUT_REGULATION, SR_T_STRING, "output_regulation",
159                 "Output channel regulation", NULL},
160         {SR_CONF_OVER_TEMPERATURE_PROTECTION, SR_T_BOOL, "otp",
161                 "Over-temperature protection", NULL},
162         {SR_CONF_OUTPUT_FREQUENCY, SR_T_UINT64, "output_frequency",
163                 "Output frequency", NULL},
164         {SR_CONF_MEASURED_QUANTITY, SR_T_STRING, "measured_quantity",
165                 "Measured quantity", NULL},
166         {SR_CONF_MEASURED_2ND_QUANTITY, SR_T_STRING, "measured_2nd_quantity",
167                 "Measured secondary quantity", NULL},
168         {SR_CONF_EQUIV_CIRCUIT_MODEL, SR_T_STRING, "equiv_circuit_model",
169                 "Equivalent circuit model", NULL},
170
171         /* Special stuff */
172         {SR_CONF_SCAN_OPTIONS, SR_T_STRING, "scan_options",
173                 "Scan options", NULL},
174         {SR_CONF_DEVICE_OPTIONS, SR_T_STRING, "device_options",
175                 "Device options", NULL},
176         {SR_CONF_SESSIONFILE, SR_T_STRING, "sessionfile",
177                 "Session file", NULL},
178         {SR_CONF_CAPTUREFILE, SR_T_STRING, "capturefile",
179                 "Capture file", NULL},
180         {SR_CONF_CAPTURE_UNITSIZE, SR_T_UINT64, "capture_unitsize",
181                 "Capture unitsize", NULL},
182         {SR_CONF_POWER_OFF, SR_T_BOOL, "power_off",
183                 "Power off", NULL},
184         {SR_CONF_DATA_SOURCE, SR_T_STRING, "data_source",
185                 "Data source", NULL},
186         {SR_CONF_PROBE_FACTOR, SR_T_UINT64, "probe_factor",
187                 "Probe factor", NULL},
188
189         /* Acquisition modes, sample limiting */
190         {SR_CONF_LIMIT_MSEC, SR_T_UINT64, "limit_time",
191                 "Time limit", NULL},
192         {SR_CONF_LIMIT_SAMPLES, SR_T_UINT64, "limit_samples",
193                 "Sample limit", NULL},
194         {SR_CONF_LIMIT_FRAMES, SR_T_UINT64, "limit_frames",
195                 "Frame limit", NULL},
196         {SR_CONF_CONTINUOUS, SR_T_UINT64, "continuous",
197                 "Continuous sampling", NULL},
198         {SR_CONF_DATALOG, SR_T_BOOL, "datalog",
199                 "Datalog", NULL},
200         {SR_CONF_DEVICE_MODE, SR_T_STRING, "device_mode",
201                 "Device mode", NULL},
202         {SR_CONF_TEST_MODE, SR_T_STRING, "test_mode",
203                 "Test mode", NULL},
204
205         {0, 0, NULL, NULL, NULL},
206 };
207
208 SR_PRIV const GVariantType *sr_variant_type_get(int datatype)
209 {
210         switch (datatype) {
211         case SR_T_INT32:
212                 return G_VARIANT_TYPE_INT32;
213         case SR_T_UINT64:
214                 return G_VARIANT_TYPE_UINT64;
215         case SR_T_STRING:
216                 return G_VARIANT_TYPE_STRING;
217         case SR_T_BOOL:
218                 return G_VARIANT_TYPE_BOOLEAN;
219         case SR_T_FLOAT:
220                 return G_VARIANT_TYPE_DOUBLE;
221         case SR_T_RATIONAL_PERIOD:
222         case SR_T_RATIONAL_VOLT:
223         case SR_T_UINT64_RANGE:
224         case SR_T_DOUBLE_RANGE:
225                 return G_VARIANT_TYPE_TUPLE;
226         case SR_T_KEYVALUE:
227                 return G_VARIANT_TYPE_DICTIONARY;
228         default:
229                 return NULL;
230         }
231 }
232
233 SR_PRIV int sr_variant_type_check(uint32_t key, GVariant *value)
234 {
235         const struct sr_config_info *info;
236         const GVariantType *type, *expected;
237         char *expected_string, *type_string;
238
239         info = sr_config_info_get(key);
240         if (!info)
241                 return SR_OK;
242
243         expected = sr_variant_type_get(info->datatype);
244         type = g_variant_get_type(value);
245         if (!g_variant_type_equal(type, expected)
246                         && !g_variant_type_is_subtype_of(type, expected)) {
247                 expected_string = g_variant_type_dup_string(expected);
248                 type_string = g_variant_type_dup_string(type);
249                 sr_err("Wrong variant type for key '%s': expected '%s', got '%s'",
250                         info->name, expected_string, type_string);
251                 g_free(expected_string);
252                 g_free(type_string);
253                 return SR_ERR_ARG;
254         }
255
256         return SR_OK;
257 }
258
259 /**
260  * Return the list of supported hardware drivers.
261  *
262  * @return Pointer to the NULL-terminated list of hardware driver pointers.
263  *
264  * @since 0.1.0
265  */
266 SR_API struct sr_dev_driver **sr_driver_list(void)
267 {
268         static struct sr_dev_driver **combined_list = NULL;
269         struct sr_dev_driver ***lists, **drivers;
270         GArray *array;
271
272         if (combined_list)
273                 return combined_list;
274
275         array = g_array_new(TRUE, FALSE, sizeof(struct sr_dev_driver *));
276         for (lists = drivers_lists; *lists; lists++)
277                 for (drivers = *lists; *drivers; drivers++)
278                         g_array_append_val(array, *drivers);
279         combined_list = (struct sr_dev_driver **)array->data;
280         g_array_free(array, FALSE);
281
282         return combined_list;
283 }
284
285 /**
286  * Initialize a hardware driver.
287  *
288  * This usually involves memory allocations and variable initializations
289  * within the driver, but _not_ scanning for attached devices.
290  * The API call sr_driver_scan() is used for that.
291  *
292  * @param ctx A libsigrok context object allocated by a previous call to
293  *            sr_init(). Must not be NULL.
294  * @param driver The driver to initialize. This must be a pointer to one of
295  *               the entries returned by sr_driver_list(). Must not be NULL.
296  *
297  * @retval SR_OK Success
298  * @retval SR_ERR_ARG Invalid parameter(s).
299  * @retval SR_ERR_BUG Internal errors.
300  * @retval other Another negative error code upon other errors.
301  *
302  * @since 0.2.0
303  */
304 SR_API int sr_driver_init(struct sr_context *ctx, struct sr_dev_driver *driver)
305 {
306         int ret;
307
308         if (!ctx) {
309                 sr_err("Invalid libsigrok context, can't initialize.");
310                 return SR_ERR_ARG;
311         }
312
313         if (!driver) {
314                 sr_err("Invalid driver, can't initialize.");
315                 return SR_ERR_ARG;
316         }
317
318         sr_spew("Initializing driver '%s'.", driver->name);
319         if ((ret = driver->init(driver, ctx)) < 0)
320                 sr_err("Failed to initialize the driver: %d.", ret);
321
322         return ret;
323 }
324
325 static int check_options(struct sr_dev_driver *driver, GSList *options,
326                 uint32_t optlist_key, struct sr_dev_inst *sdi,
327                 struct sr_channel_group *cg)
328 {
329         struct sr_config *src;
330         const struct sr_config_info *srci;
331         GVariant *gvar_opts;
332         GSList *l;
333         const uint32_t *opts;
334         gsize num_opts, i;
335         int ret;
336
337         if (sr_config_list(driver, sdi, cg, optlist_key, &gvar_opts) != SR_OK) {
338                 /* Driver publishes no options for this optlist. */
339                 return SR_ERR;
340         }
341
342         ret = SR_OK;
343         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
344         for (l = options; l; l = l->next) {
345                 src = l->data;
346                 for (i = 0; i < num_opts; i++) {
347                         if (opts[i] == src->key)
348                                 break;
349                 }
350                 if (i == num_opts) {
351                         if (!(srci = sr_config_info_get(src->key)))
352                                 /* Shouldn't happen. */
353                                 sr_err("Invalid option %d.", src->key);
354                         else
355                                 sr_err("Invalid option '%s'.", srci->id);
356                         ret = SR_ERR_ARG;
357                         break;
358                 }
359                 if (sr_variant_type_check(src->key, src->data) != SR_OK) {
360                         ret = SR_ERR_ARG;
361                         break;
362                 }
363         }
364         g_variant_unref(gvar_opts);
365
366         return ret;
367 }
368
369 /**
370  * Tell a hardware driver to scan for devices.
371  *
372  * In addition to the detection, the devices that are found are also
373  * initialized automatically. On some devices, this involves a firmware upload,
374  * or other such measures.
375  *
376  * The order in which the system is scanned for devices is not specified. The
377  * caller should not assume or rely on any specific order.
378  *
379  * Before calling sr_driver_scan(), the user must have previously initialized
380  * the driver by calling sr_driver_init().
381  *
382  * @param driver The driver that should scan. This must be a pointer to one of
383  *               the entries returned by sr_driver_list(). Must not be NULL.
384  * @param options A list of 'struct sr_hwopt' options to pass to the driver's
385  *                scanner. Can be NULL/empty.
386  *
387  * @return A GSList * of 'struct sr_dev_inst', or NULL if no devices were
388  *         found (or errors were encountered). This list must be freed by the
389  *         caller using g_slist_free(), but without freeing the data pointed
390  *         to in the list.
391  *
392  * @since 0.2.0
393  */
394 SR_API GSList *sr_driver_scan(struct sr_dev_driver *driver, GSList *options)
395 {
396         GSList *l;
397
398         if (!driver) {
399                 sr_err("Invalid driver, can't scan for devices.");
400                 return NULL;
401         }
402
403         if (!driver->priv) {
404                 sr_err("Driver not initialized, can't scan for devices.");
405                 return NULL;
406         }
407
408         if (options) {
409                 if (check_options(driver, options, SR_CONF_SCAN_OPTIONS, NULL, NULL) != SR_OK)
410                         return NULL;
411         }
412
413         l = driver->scan(driver, options);
414
415         sr_spew("Scan of '%s' found %d devices.", driver->name,
416                 g_slist_length(l));
417
418         return l;
419 }
420
421 /** Call driver cleanup function for all drivers.
422  *  @private */
423 SR_PRIV void sr_hw_cleanup_all(void)
424 {
425         int i;
426         struct sr_dev_driver **drivers;
427
428         drivers = sr_driver_list();
429         for (i = 0; drivers[i]; i++) {
430                 if (drivers[i]->cleanup)
431                         drivers[i]->cleanup(drivers[i]);
432                 drivers[i]->priv = NULL;
433         }
434 }
435
436 /** Allocate struct sr_config.
437  *  A floating reference can be passed in for data.
438  *  @private
439  */
440 SR_PRIV struct sr_config *sr_config_new(uint32_t key, GVariant *data)
441 {
442         struct sr_config *src;
443
444         src = g_malloc0(sizeof(struct sr_config));
445         src->key = key;
446         src->data = g_variant_ref_sink(data);
447
448         return src;
449 }
450
451 /** Free struct sr_config.
452  *  @private
453  */
454 SR_PRIV void sr_config_free(struct sr_config *src)
455 {
456
457         if (!src || !src->data) {
458                 sr_err("%s: invalid data!", __func__);
459                 return;
460         }
461
462         g_variant_unref(src->data);
463         g_free(src);
464
465 }
466
467 static void log_key(const struct sr_dev_inst *sdi,
468         const struct sr_channel_group *cg, uint32_t key, int op, GVariant *data)
469 {
470         const char *opstr;
471         const struct sr_config_info *srci;
472
473         /* Don't log SR_CONF_DEVICE_OPTIONS, it's verbose and not too useful. */
474         if (key == SR_CONF_DEVICE_OPTIONS)
475                 return;
476
477         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
478         srci = sr_config_info_get(key);
479
480         sr_spew("sr_config_%s(): key %d (%s) sdi %p cg %s -> %s", opstr, key,
481                 srci ? srci->id : "NULL", sdi, cg ? cg->name : "NULL",
482                 data ? g_variant_print(data, TRUE) : "NULL");
483 }
484
485 static int check_key(const struct sr_dev_driver *driver,
486                 const struct sr_dev_inst *sdi, const struct sr_channel_group *cg,
487                 uint32_t key, int op, GVariant *data)
488 {
489         const struct sr_config_info *srci;
490         gsize num_opts, i;
491         GVariant *gvar_opts;
492         const uint32_t *opts;
493         uint32_t pub_opt;
494         char *suffix, *opstr;
495
496         if (sdi && cg)
497                 suffix = " for this device and channel group";
498         else if (sdi)
499                 suffix = " for this device";
500         else
501                 suffix = "";
502
503         if (!(srci = sr_config_info_get(key))) {
504                 sr_err("Invalid key %d.", key);
505                 return SR_ERR_ARG;
506         }
507         opstr = op == SR_CONF_GET ? "get" : op == SR_CONF_SET ? "set" : "list";
508
509         switch (key) {
510         case SR_CONF_LIMIT_MSEC:
511         case SR_CONF_LIMIT_SAMPLES:
512         case SR_CONF_SAMPLERATE:
513                 /* Setting any of these to 0 is not useful. */
514                 if (op != SR_CONF_SET || !data)
515                         break;
516                 if (g_variant_get_uint64(data) == 0) {
517                         sr_err("Cannot set '%s' to 0.", srci->id);
518                         return SR_ERR_ARG;
519                 }
520                 break;
521         }
522
523         if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS, &gvar_opts) != SR_OK) {
524                 /* Driver publishes no options. */
525                 sr_err("No options available%s.", srci->id, suffix);
526                 return SR_ERR_ARG;
527         }
528         opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
529         pub_opt = 0;
530         for (i = 0; i < num_opts; i++) {
531                 if ((opts[i] & SR_CONF_MASK) == key) {
532                         pub_opt = opts[i];
533                         break;
534                 }
535         }
536         g_variant_unref(gvar_opts);
537         if (!pub_opt) {
538                 sr_err("Option '%s' not available%s.", srci->id, suffix);
539                 return SR_ERR_ARG;
540         }
541
542         if (!(pub_opt & op)) {
543                 sr_err("Option '%s' not available to %s%s.", srci->id, opstr, suffix);
544                 return SR_ERR_ARG;
545         }
546
547         return SR_OK;
548 }
549
550 /**
551  * Query value of a configuration key at the given driver or device instance.
552  *
553  * @param[in] driver The sr_dev_driver struct to query.
554  * @param[in] sdi (optional) If the key is specific to a device, this must
555  *            contain a pointer to the struct sr_dev_inst to be checked.
556  *            Otherwise it must be NULL.
557  * @param[in] cg The channel group on the device for which to list the
558  *                    values, or NULL.
559  * @param[in] key The configuration key (SR_CONF_*).
560  * @param[in,out] data Pointer to a GVariant where the value will be stored.
561  *             Must not be NULL. The caller is given ownership of the GVariant
562  *             and must thus decrease the refcount after use. However if
563  *             this function returns an error code, the field should be
564  *             considered unused, and should not be unreferenced.
565  *
566  * @retval SR_OK Success.
567  * @retval SR_ERR Error.
568  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
569  *          interpreted as an error by the caller; merely as an indication
570  *          that it's not applicable.
571  *
572  * @since 0.3.0
573  */
574 SR_API int sr_config_get(const struct sr_dev_driver *driver,
575                 const struct sr_dev_inst *sdi,
576                 const struct sr_channel_group *cg,
577                 uint32_t key, GVariant **data)
578 {
579         int ret;
580
581         if (!driver || !data)
582                 return SR_ERR;
583
584         if (!driver->config_get)
585                 return SR_ERR_ARG;
586
587         if (check_key(driver, sdi, cg, key, SR_CONF_GET, NULL) != SR_OK)
588                 return SR_ERR_ARG;
589
590         if ((ret = driver->config_get(key, data, sdi, cg)) == SR_OK) {
591                 log_key(sdi, cg, key, SR_CONF_GET, *data);
592                 /* Got a floating reference from the driver. Sink it here,
593                  * caller will need to unref when done with it. */
594                 g_variant_ref_sink(*data);
595         }
596
597         return ret;
598 }
599
600 /**
601  * Set value of a configuration key in a device instance.
602  *
603  * @param[in] sdi The device instance.
604  * @param[in] cg The channel group on the device for which to list the
605  *                    values, or NULL.
606  * @param[in] key The configuration key (SR_CONF_*).
607  * @param data The new value for the key, as a GVariant with GVariantType
608  *        appropriate to that key. A floating reference can be passed
609  *        in; its refcount will be sunk and unreferenced after use.
610  *
611  * @retval SR_OK Success.
612  * @retval SR_ERR Error.
613  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
614  *          interpreted as an error by the caller; merely as an indication
615  *          that it's not applicable.
616  *
617  * @since 0.3.0
618  */
619 SR_API int sr_config_set(const struct sr_dev_inst *sdi,
620                 const struct sr_channel_group *cg,
621                 uint32_t key, GVariant *data)
622 {
623         int ret;
624
625         g_variant_ref_sink(data);
626
627         if (!sdi || !sdi->driver || !data)
628                 ret = SR_ERR;
629         else if (!sdi->driver->config_set)
630                 ret = SR_ERR_ARG;
631         else if (check_key(sdi->driver, sdi, cg, key, SR_CONF_SET, data) != SR_OK)
632                 return SR_ERR_ARG;
633         else if ((ret = sr_variant_type_check(key, data)) == SR_OK) {
634                 log_key(sdi, cg, key, SR_CONF_SET, data);
635                 ret = sdi->driver->config_set(key, data, sdi, cg);
636         }
637
638         g_variant_unref(data);
639
640         return ret;
641 }
642
643 /**
644  * Apply configuration settings to the device hardware.
645  *
646  * @param sdi The device instance.
647  *
648  * @return SR_OK upon success or SR_ERR in case of error.
649  *
650  * @since 0.3.0
651  */
652 SR_API int sr_config_commit(const struct sr_dev_inst *sdi)
653 {
654         int ret;
655
656         if (!sdi || !sdi->driver)
657                 ret = SR_ERR;
658         else if (!sdi->driver->config_commit)
659                 ret = SR_OK;
660         else
661                 ret = sdi->driver->config_commit(sdi);
662
663         return ret;
664 }
665
666 /**
667  * List all possible values for a configuration key.
668  *
669  * @param[in] driver The sr_dev_driver struct to query.
670  * @param[in] sdi (optional) If the key is specific to a device, this must
671  *            contain a pointer to the struct sr_dev_inst to be checked.
672  * @param[in] cg The channel group on the device for which to list the
673  *                    values, or NULL.
674  * @param[in] key The configuration key (SR_CONF_*).
675  * @param[in,out] data A pointer to a GVariant where the list will be stored.
676  *             The caller is given ownership of the GVariant and must thus
677  *             unref the GVariant after use. However if this function
678  *             returns an error code, the field should be considered
679  *             unused, and should not be unreferenced.
680  *
681  * @retval SR_OK Success.
682  * @retval SR_ERR Error.
683  * @retval SR_ERR_ARG The driver doesn't know that key, but this is not to be
684  *          interpreted as an error by the caller; merely as an indication
685  *          that it's not applicable.
686  *
687  * @since 0.3.0
688  */
689 SR_API int sr_config_list(const struct sr_dev_driver *driver,
690                 const struct sr_dev_inst *sdi,
691                 const struct sr_channel_group *cg,
692                 uint32_t key, GVariant **data)
693 {
694         int ret;
695
696         if (!driver || !data)
697                 return SR_ERR;
698         else if (!driver->config_list)
699                 return SR_ERR_ARG;
700         else if (key != SR_CONF_SCAN_OPTIONS && key != SR_CONF_DEVICE_OPTIONS) {
701                 if (check_key(driver, sdi, cg, key, SR_CONF_LIST, NULL) != SR_OK)
702                         return SR_ERR_ARG;
703         }
704         if ((ret = driver->config_list(key, data, sdi, cg)) == SR_OK) {
705                 log_key(sdi, cg, key, SR_CONF_LIST, *data);
706                 g_variant_ref_sink(*data);
707         }
708
709         return ret;
710 }
711
712 /**
713  * Get information about a configuration key, by key.
714  *
715  * @param[in] key The configuration key.
716  *
717  * @return A pointer to a struct sr_config_info, or NULL if the key
718  *         was not found.
719  *
720  * @since 0.2.0
721  */
722 SR_API const struct sr_config_info *sr_config_info_get(uint32_t key)
723 {
724         int i;
725
726         for (i = 0; sr_config_info_data[i].key; i++) {
727                 if (sr_config_info_data[i].key == key)
728                         return &sr_config_info_data[i];
729         }
730
731         return NULL;
732 }
733
734 /**
735  * Get information about a configuration key, by name.
736  *
737  * @param[in] optname The configuration key.
738  *
739  * @return A pointer to a struct sr_config_info, or NULL if the key
740  *         was not found.
741  *
742  * @since 0.2.0
743  */
744 SR_API const struct sr_config_info *sr_config_info_name_get(const char *optname)
745 {
746         int i;
747
748         for (i = 0; sr_config_info_data[i].key; i++) {
749                 if (!sr_config_info_data[i].id)
750                         continue;
751                 if (!strcmp(sr_config_info_data[i].id, optname))
752                         return &sr_config_info_data[i];
753         }
754
755         return NULL;
756 }
757
758 /** @} */