[libsigrok.git] / backend.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Peter Stuge <peter@stuge.se>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <glib.h>
#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
#include "libsigrok.h"
#include "libsigrok-internal.h"

#define LOG_PREFIX "backend"

extern struct sr_session *session;

/**
 * @mainpage libsigrok API
 *
 * @section sec_intro Introduction
 *
 * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
 * portable, cross-platform, Free/Libre/Open-Source signal analysis software
 * suite that supports various device types (such as logic analyzers,
 * oscilloscopes, multimeters, and more).
 *
 * <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared
 * library written in C which provides the basic API for talking to
 * <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a>
 * and reading/writing the acquired data into various
 * <a href="http://sigrok.org/wiki/Input_output_formats">input/output
 * file formats</a>.
 *
 * @section sec_api API reference
 *
 * See the "Modules" page for an introduction to various libsigrok
 * related topics and the detailed API documentation of the respective
 * functions.
 *
 * You can also browse the API documentation by file, or review all
 * data structures.
 *
 * @section sec_mailinglists Mailing lists
 *
 * There are two mailing lists for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>.
 *
 * @section sec_irc IRC
 *
 * You can find the sigrok developers in the
 * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
 * IRC channel on Freenode.
 *
 * @section sec_website Website
 *
 * <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
 */

/**
 * @file
 *
 * Initializing and shutting down libsigrok.
 */

/**
 * @defgroup grp_init Initialization
 *
 * Initializing and shutting down libsigrok.
 *
 * Before using any of the libsigrok functionality, sr_init() must
 * be called to initialize the library, which will return a struct sr_context
 * when the initialization was successful.
 *
 * When libsigrok functionality is no longer needed, sr_exit() should be
 * called, which will (among other things) free the struct sr_context.
 *
 * Example for a minimal program using libsigrok:
 *
 * @code{.c}
 *   #include <stdio.h>
 *   #include <libsigrok/libsigrok.h>
 *
 *   int main(int argc, char **argv)
 *   {
 *   	int ret;
 *   	struct sr_context *sr_ctx;
 *
 *   	if ((ret = sr_init(&sr_ctx)) != SR_OK) {
 *   		printf("Error initializing libsigrok (%s): %s.\n",
 *   		       sr_strerror_name(ret), sr_strerror(ret));
 *   		return 1;
 *   	}
 *
 *   	// Use libsigrok functions here...
 *
 *   	if ((ret = sr_exit(sr_ctx)) != SR_OK) {
 *   		printf("Error shutting down libsigrok (%s): %s.\n",
 *   		       sr_strerror_name(ret), sr_strerror(ret));
 *   		return 1;
 *   	}
 *
 *   	return 0;
 *   }
 * @endcode
 *
 * @{
 */

/**
 * Sanity-check all libsigrok drivers.
 *
 * @retval SR_OK All drivers are OK
 * @retval SR_ERR One or more drivers have issues.
 */
static int sanity_check_all_drivers(void)
{
	int i, errors, ret = SR_OK;
	struct sr_dev_driver **drivers;
	const char *d;

	sr_spew("Sanity-checking all drivers.");

	drivers = sr_driver_list();
	for (i = 0; drivers[i]; i++) {
		errors = 0;

		d = (drivers[i]->name) ? drivers[i]->name : "NULL";

		if (!drivers[i]->name) {
			sr_err("No name in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->longname) {
			sr_err("No longname in driver %d ('%s').", i, d);
			errors++;
		}
		if (drivers[i]->api_version < 1) {
			sr_err("API version in driver %d ('%s') < 1.", i, d);
			errors++;
		}
		if (!drivers[i]->init) {
			sr_err("No init in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->cleanup) {
			sr_err("No cleanup in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->scan) {
			sr_err("No scan in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->dev_list) {
			sr_err("No dev_list in driver %d ('%s').", i, d);
			errors++;
		}
		/* Note: config_get() is optional. */
		if (!drivers[i]->config_set) {
			sr_err("No config_set in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->config_list) {
			sr_err("No config_list in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->dev_open) {
			sr_err("No dev_open in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->dev_close) {
			sr_err("No dev_close in driver %d ('%s').", i, d);
			errors++;
		}
		if (!drivers[i]->dev_acquisition_start) {
			sr_err("No dev_acquisition_start in driver %d ('%s').",
			       i, d);
			errors++;
		}
		if (!drivers[i]->dev_acquisition_stop) {
			sr_err("No dev_acquisition_stop in driver %d ('%s').",
			       i, d);
			errors++;
		}

		/* Note: 'priv' is allowed to be NULL. */

		if (errors == 0)
			continue;

		ret = SR_ERR;
	}

	return ret;
}

/**
 * Sanity-check all libsigrok input modules.
 *
 * @retval SR_OK All modules are OK
 * @retval SR_ERR One or more modules have issues.
 */
static int sanity_check_all_input_modules(void)
{
	int i, errors, ret = SR_OK;
	struct sr_input_format **inputs;
	const char *d;

	sr_spew("Sanity-checking all input modules.");

	inputs = sr_input_list();
	for (i = 0; inputs[i]; i++) {
		errors = 0;

		d = (inputs[i]->id) ? inputs[i]->id : "NULL";

		if (!inputs[i]->id) {
			sr_err("No ID in module %d ('%s').", i, d);
			errors++;
		}
		if (!inputs[i]->description) {
			sr_err("No description in module %d ('%s').", i, d);
			errors++;
		}
		if (!inputs[i]->format_match) {
			sr_err("No format_match in module %d ('%s').", i, d);
			errors++;
		}
		if (!inputs[i]->init) {
			sr_err("No init in module %d ('%s').", i, d);
			errors++;
		}
		if (!inputs[i]->loadfile) {
			sr_err("No loadfile in module %d ('%s').", i, d);
			errors++;
		}

		if (errors == 0)
			continue;

		ret = SR_ERR;
	}

	return ret;
}

/**
 * Sanity-check all libsigrok output modules.
 *
 * @retval SR_OK All modules are OK
 * @retval SR_ERR One or more modules have issues.
 */
static int sanity_check_all_output_modules(void)
{
	int i, errors, ret = SR_OK;
	struct sr_output_format **outputs;
	const char *d;

	sr_spew("Sanity-checking all output modules.");

	outputs = sr_output_list();
	for (i = 0; outputs[i]; i++) {
		errors = 0;

		d = (outputs[i]->id) ? outputs[i]->id : "NULL";

		if (!outputs[i]->id) {
			sr_err("No ID in module %d ('%s').", i, d);
			errors++;
		}
		if (!outputs[i]->description) {
			sr_err("No description in module '%s'.", d);
			errors++;
		}
		if (!outputs[i]->receive) {
			sr_err("No receive in module '%s'.", d);
			errors++;
		}

		if (errors == 0)
			continue;

		ret = SR_ERR;
	}

	return ret;
}

/**
 * Initialize libsigrok.
 *
 * This function must be called before any other libsigrok function.
 *
 * @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
 *            This will be a pointer to a newly allocated libsigrok context
 *            object upon success, and is undefined upon errors.
 *
 * @return SR_OK upon success, a (negative) error code otherwise. Upon errors
 *         the 'ctx' pointer is undefined and should not be used. Upon success,
 *         the context will be free'd by sr_exit() as part of the libsigrok
 *         shutdown.
 *
 * @since 0.2.0
 */
SR_API int sr_init(struct sr_context **ctx)
{
	int ret = SR_ERR;
	struct sr_context *context;

	if (!ctx) {
		sr_err("%s(): libsigrok context was NULL.", __func__);
		return SR_ERR;
	}

	if (sanity_check_all_drivers() < 0) {
		sr_err("Internal driver error(s), aborting.");
		return ret;
	}

	if (sanity_check_all_input_modules() < 0) {
		sr_err("Internal input module error(s), aborting.");
		return ret;
	}

	if (sanity_check_all_output_modules() < 0) {
		sr_err("Internal output module error(s), aborting.");
		return ret;
	}

	/* + 1 to handle when struct sr_context has no members. */
	context = g_try_malloc0(sizeof(struct sr_context) + 1);

	if (!context) {
		ret = SR_ERR_MALLOC;
		goto done;
	}

#ifdef HAVE_LIBUSB_1_0
	ret = libusb_init(&context->libusb_ctx);
	if (LIBUSB_SUCCESS != ret) {
		sr_err("libusb_init() returned %s.", libusb_error_name(ret));
		ret = SR_ERR;
		goto done;
	}
#endif

	*ctx = context;
	context = NULL;
	session = NULL;
	ret = SR_OK;

done:
	if (context)
		g_free(context);
	return ret;
}

/**
 * Shutdown libsigrok.
 *
 * @param ctx Pointer to a libsigrok context struct. Must not be NULL.
 *
 * @retval SR_OK Success
 * @retval other Error code SR_ERR, ...
 *
 * @since 0.2.0
 */
SR_API int sr_exit(struct sr_context *ctx)
{
	if (!ctx) {
		sr_err("%s(): libsigrok context was NULL.", __func__);
		return SR_ERR;
	}

	sr_hw_cleanup_all();

#ifdef HAVE_LIBUSB_1_0
	libusb_exit(ctx->libusb_ctx);
#endif

	g_free(ctx);

	return SR_OK;
}

/** @} */
Commit	Line	Data
a1bb33af	1	/*
50985c20	2	* This file is part of the libsigrok project.
a1bb33af	3	*
c73d2ea4	4	* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
b8072700	5	* Copyright (C) 2012 Peter Stuge <peter@stuge.se>
a1bb33af UH	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <glib.h>
545f9786	22	#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
45c59c8b BV	23	#include "libsigrok.h"
45c59c8b BV	24	#include "libsigrok-internal.h"
a1bb33af	25
3544f848 ML	26	#define LOG_PREFIX "backend"
3544f848 ML	27
fa93154f BV	28	extern struct sr_session *session;
fa93154f BV	29
5b30cca7 UH	30	/**
	31	* @mainpage libsigrok API
	32	*
	33	* @section sec_intro Introduction
	34	*
	35	* The <a href="http://sigrok.org">sigrok</a> project aims at creating a
	36	* portable, cross-platform, Free/Libre/Open-Source signal analysis software
	37	* suite that supports various device types (such as logic analyzers,
	38	* oscilloscopes, multimeters, and more).
	39	*
	40	* <a href="http://sigrok.org/wiki/Libsigrok">libsigrok</a> is a shared
	41	* library written in C which provides the basic API for talking to
	42	* <a href="http://sigrok.org/wiki/Supported_hardware">supported hardware</a>
	43	* and reading/writing the acquired data into various
	44	* <a href="http://sigrok.org/wiki/Input_output_formats">input/output
	45	* file formats</a>.
	46	*
f21193fa	47	* @section sec_api API reference
5b30cca7	48	*
f21193fa UH	49	* See the "Modules" page for an introduction to various libsigrok
	50	* related topics and the detailed API documentation of the respective
	51	* functions.
	52	*
	53	* You can also browse the API documentation by file, or review all
	54	* data structures.
5b30cca7 UH	55	*
	56	* @section sec_mailinglists Mailing lists
	57	*
	58	* There are two mailing lists for sigrok/libsigrok: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a> and <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-commits">sigrok-commits</a>.
	59	*
	60	* @section sec_irc IRC
	61	*
	62	* You can find the sigrok developers in the
	63	* <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
	64	* IRC channel on Freenode.
	65	*
	66	* @section sec_website Website
	67	*
	68	* <a href="http://sigrok.org/wiki/Libsigrok">sigrok.org/wiki/Libsigrok</a>
	69	*/
	70
393fb9cb UH	71	/**
	72	* @file
	73	*
	74	* Initializing and shutting down libsigrok.
	75	*/
	76
7b870c38 UH	77	/**
	78	* @defgroup grp_init Initialization
	79	*
	80	* Initializing and shutting down libsigrok.
	81	*
afe2f28e UH	82	* Before using any of the libsigrok functionality, sr_init() must
	83	* be called to initialize the library, which will return a struct sr_context
	84	* when the initialization was successful.
	85	*
	86	* When libsigrok functionality is no longer needed, sr_exit() should be
	87	* called, which will (among other things) free the struct sr_context.
	88	*
	89	* Example for a minimal program using libsigrok:
	90	*
	91	* @code{.c}
	92	* #include <stdio.h>
	93	* #include <libsigrok/libsigrok.h>
	94	*
	95	* int main(int argc, char **argv)
	96	* {
	97	* int ret;
	98	* struct sr_context *sr_ctx;
	99	*
	100	* if ((ret = sr_init(&sr_ctx)) != SR_OK) {
df823ac4	101	* printf("Error initializing libsigrok (%s): %s.\n",
afe2f28e UH	102	* sr_strerror_name(ret), sr_strerror(ret));
	103	* return 1;
	104	* }
	105	*
	106	* // Use libsigrok functions here...
	107	*
	108	* if ((ret = sr_exit(sr_ctx)) != SR_OK) {
df823ac4	109	* printf("Error shutting down libsigrok (%s): %s.\n",
afe2f28e UH	110	* sr_strerror_name(ret), sr_strerror(ret));
	111	* return 1;
	112	* }
	113	*
	114	* return 0;
	115	* }
	116	* @endcode
	117	*
7b870c38 UH	118	* @{
	119	*/
	120
55a6daf5 UH	121	/**
	122	* Sanity-check all libsigrok drivers.
	123	*
04cb9157 MH	124	* @retval SR_OK All drivers are OK
04cb9157 MH	125	* @retval SR_ERR One or more drivers have issues.
55a6daf5 UH	126	*/
	127	static int sanity_check_all_drivers(void)
	128	{
	129	int i, errors, ret = SR_OK;
	130	struct sr_dev_driver **drivers;
	131	const char *d;
	132
	133	sr_spew("Sanity-checking all drivers.");
	134
	135	drivers = sr_driver_list();
	136	for (i = 0; drivers[i]; i++) {
	137	errors = 0;
	138
	139	d = (drivers[i]->name) ? drivers[i]->name : "NULL";
	140
	141	if (!drivers[i]->name) {
	142	sr_err("No name in driver %d ('%s').", i, d);
	143	errors++;
	144	}
	145	if (!drivers[i]->longname) {
	146	sr_err("No longname in driver %d ('%s').", i, d);
	147	errors++;
	148	}
	149	if (drivers[i]->api_version < 1) {
	150	sr_err("API version in driver %d ('%s') < 1.", i, d);
	151	errors++;
	152	}
	153	if (!drivers[i]->init) {
	154	sr_err("No init in driver %d ('%s').", i, d);
	155	errors++;
	156	}
	157	if (!drivers[i]->cleanup) {
	158	sr_err("No cleanup in driver %d ('%s').", i, d);
	159	errors++;
	160	}
	161	if (!drivers[i]->scan) {
	162	sr_err("No scan in driver %d ('%s').", i, d);
	163	errors++;
	164	}
	165	if (!drivers[i]->dev_list) {
	166	sr_err("No dev_list in driver %d ('%s').", i, d);
	167	errors++;
	168	}
6fab7b8f UH	169	/* Note: config_get() is optional. */
	170	if (!drivers[i]->config_set) {
	171	sr_err("No config_set in driver %d ('%s').", i, d);
	172	errors++;
	173	}
	174	if (!drivers[i]->config_list) {
	175	sr_err("No config_list in driver %d ('%s').", i, d);
	176	errors++;
	177	}
55a6daf5 UH	178	if (!drivers[i]->dev_open) {
	179	sr_err("No dev_open in driver %d ('%s').", i, d);
	180	errors++;
	181	}
	182	if (!drivers[i]->dev_close) {
	183	sr_err("No dev_close in driver %d ('%s').", i, d);
	184	errors++;
	185	}
55a6daf5 UH	186	if (!drivers[i]->dev_acquisition_start) {
	187	sr_err("No dev_acquisition_start in driver %d ('%s').",
	188	i, d);
	189	errors++;
	190	}
	191	if (!drivers[i]->dev_acquisition_stop) {
	192	sr_err("No dev_acquisition_stop in driver %d ('%s').",
	193	i, d);
	194	errors++;
	195	}
	196
	197	/* Note: 'priv' is allowed to be NULL. */
	198
	199	if (errors == 0)
	200	continue;
	201
	202	ret = SR_ERR;
	203	}
	204
	205	return ret;
	206	}
	207
218e629f UH	208	/**
	209	* Sanity-check all libsigrok input modules.
	210	*
04cb9157 MH	211	* @retval SR_OK All modules are OK
04cb9157 MH	212	* @retval SR_ERR One or more modules have issues.
218e629f UH	213	*/
	214	static int sanity_check_all_input_modules(void)
	215	{
	216	int i, errors, ret = SR_OK;
	217	struct sr_input_format **inputs;
	218	const char *d;
	219
	220	sr_spew("Sanity-checking all input modules.");
	221
	222	inputs = sr_input_list();
	223	for (i = 0; inputs[i]; i++) {
	224	errors = 0;
	225
	226	d = (inputs[i]->id) ? inputs[i]->id : "NULL";
	227
	228	if (!inputs[i]->id) {
	229	sr_err("No ID in module %d ('%s').", i, d);
	230	errors++;
	231	}
	232	if (!inputs[i]->description) {
	233	sr_err("No description in module %d ('%s').", i, d);
	234	errors++;
	235	}
	236	if (!inputs[i]->format_match) {
	237	sr_err("No format_match in module %d ('%s').", i, d);
	238	errors++;
	239	}
	240	if (!inputs[i]->init) {
	241	sr_err("No init in module %d ('%s').", i, d);
	242	errors++;
	243	}
	244	if (!inputs[i]->loadfile) {
	245	sr_err("No loadfile in module %d ('%s').", i, d);
	246	errors++;
	247	}
	248
	249	if (errors == 0)
	250	continue;
	251
	252	ret = SR_ERR;
	253	}
	254
	255	return ret;
	256	}
	257
	258	/**
	259	* Sanity-check all libsigrok output modules.
	260	*
04cb9157 MH	261	* @retval SR_OK All modules are OK
04cb9157 MH	262	* @retval SR_ERR One or more modules have issues.
218e629f UH	263	*/
	264	static int sanity_check_all_output_modules(void)
	265	{
	266	int i, errors, ret = SR_OK;
	267	struct sr_output_format **outputs;
	268	const char *d;
	269
	270	sr_spew("Sanity-checking all output modules.");
	271
	272	outputs = sr_output_list();
	273	for (i = 0; outputs[i]; i++) {
	274	errors = 0;
	275
	276	d = (outputs[i]->id) ? outputs[i]->id : "NULL";
	277
	278	if (!outputs[i]->id) {
	279	sr_err("No ID in module %d ('%s').", i, d);
	280	errors++;
	281	}
	282	if (!outputs[i]->description) {
44559b2c	283	sr_err("No description in module '%s'.", d);
218e629f UH	284	errors++;
218e629f UH	285	}
44559b2c BV	286	if (!outputs[i]->receive) {
44559b2c BV	287	sr_err("No receive in module '%s'.", d);
218e629f UH	288	errors++;
	289	}
	290
218e629f UH	291	if (errors == 0)
	292	continue;
	293
	294	ret = SR_ERR;
	295	}
	296
	297	return ret;
	298	}
	299
cd009d55 UH	300	/**
	301	* Initialize libsigrok.
	302	*
c46762a2 UH	303	* This function must be called before any other libsigrok function.
	304	*
	305	* @param ctx Pointer to a libsigrok context struct pointer. Must not be NULL.
	306	* This will be a pointer to a newly allocated libsigrok context
	307	* object upon success, and is undefined upon errors.
	308	*
	309	* @return SR_OK upon success, a (negative) error code otherwise. Upon errors
	310	* the 'ctx' pointer is undefined and should not be used. Upon success,
	311	* the context will be free'd by sr_exit() as part of the libsigrok
	312	* shutdown.
9fb5f2df	313	*
53f05fa8	314	* @since 0.2.0
cd009d55	315	*/
b8072700	316	SR_API int sr_init(struct sr_context **ctx)
a1bb33af	317	{
b8072700 PS	318	int ret = SR_ERR;
	319	struct sr_context *context;
	320
c46762a2 UH	321	if (!ctx) {
	322	sr_err("%s(): libsigrok context was NULL.", __func__);
	323	return SR_ERR;
	324	}
	325
55a6daf5 UH	326	if (sanity_check_all_drivers() < 0) {
	327	sr_err("Internal driver error(s), aborting.");
	328	return ret;
	329	}
	330
218e629f UH	331	if (sanity_check_all_input_modules() < 0) {
	332	sr_err("Internal input module error(s), aborting.");
	333	return ret;
	334	}
	335
	336	if (sanity_check_all_output_modules() < 0) {
	337	sr_err("Internal output module error(s), aborting.");
	338	return ret;
	339	}
	340
b8072700 PS	341	/* + 1 to handle when struct sr_context has no members. */
	342	context = g_try_malloc0(sizeof(struct sr_context) + 1);
	343
	344	if (!context) {
	345	ret = SR_ERR_MALLOC;
	346	goto done;
	347	}
	348
785b9ff2 PS	349	#ifdef HAVE_LIBUSB_1_0
785b9ff2 PS	350	ret = libusb_init(&context->libusb_ctx);
8e2d43cc	351	if (LIBUSB_SUCCESS != ret) {
9d122af8	352	sr_err("libusb_init() returned %s.", libusb_error_name(ret));
63c07e48	353	ret = SR_ERR;
785b9ff2 PS	354	goto done;
	355	}
	356	#endif
	357
b8072700	358	*ctx = context;
123d97b1	359	context = NULL;
fa93154f	360	session = NULL;
b8072700 PS	361	ret = SR_OK;
	362
	363	done:
123d97b1 PS	364	if (context)
123d97b1 PS	365	g_free(context);
b8072700	366	return ret;
a1bb33af UH	367	}
a1bb33af UH	368
cd009d55 UH	369	/**
	370	* Shutdown libsigrok.
	371	*
c46762a2 UH	372	* @param ctx Pointer to a libsigrok context struct. Must not be NULL.
c46762a2 UH	373	*
04cb9157 MH	374	* @retval SR_OK Success
04cb9157 MH	375	* @retval other Error code SR_ERR, ...
9fb5f2df	376	*
53f05fa8	377	* @since 0.2.0
cd009d55	378	*/
b8072700	379	SR_API int sr_exit(struct sr_context *ctx)
a1bb33af	380	{
c46762a2 UH	381	if (!ctx) {
	382	sr_err("%s(): libsigrok context was NULL.", __func__);
	383	return SR_ERR;
	384	}
	385
93a04e3b	386	sr_hw_cleanup_all();
cd009d55	387
785b9ff2 PS	388	#ifdef HAVE_LIBUSB_1_0
	389	libusb_exit(ctx->libusb_ctx);
	390	#endif
	391
b8072700 PS	392	g_free(ctx);
b8072700 PS	393
cd009d55	394	return SR_OK;
a1bb33af	395	}
7b870c38 UH	396
7b870c38 UH	397	/** @} */