[libsigrok.git] / device.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * 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 <stdio.h>
#include <glib.h>
#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
#include "libsigrok.h"
#include "libsigrok-internal.h"

/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "device: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)

/**
 * @file
 *
 * Device handling in libsigrok.
 */

/**
 * @defgroup grp_devices Devices
 *
 * Device handling in libsigrok.
 *
 * @{
 */

/** @private */
SR_PRIV struct sr_probe *sr_probe_new(int index, int type,
		gboolean enabled, const char *name)
{
	struct sr_probe *probe;

	if (!(probe = g_try_malloc0(sizeof(struct sr_probe)))) {
		sr_err("Probe malloc failed.");
		return NULL;
	}

	probe->index = index;
	probe->type = type;
	probe->enabled = enabled;
	if (name)
		probe->name = g_strdup(name);

	return probe;
}

/**
 * Set the name of the specified probe in the specified device.
 *
 * If the probe already has a different name assigned to it, it will be
 * removed, and the new name will be saved instead.
 *
 * @param sdi The device instance the probe is connected to.
 * @param probenum The number of the probe whose name to set.
 *                 Note that the probe numbers start at 0.
 * @param name The new name that the specified probe should get. A copy
 *             of the string is made.
 *
 * @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
 *
 * @since 0.1.0 (but the API changed in 0.2.0)
 */
SR_API int sr_dev_probe_name_set(const struct sr_dev_inst *sdi,
		int probenum, const char *name)
{
	GSList *l;
	struct sr_probe *probe;
	int ret;

	if (!sdi) {
		sr_err("%s: sdi was NULL", __func__);
		return SR_ERR_ARG;
	}

	ret = SR_ERR_ARG;
	for (l = sdi->probes; l; l = l->next) {
		probe = l->data;
		if (probe->index == probenum) {
			g_free(probe->name);
			probe->name = g_strdup(name);
			ret = SR_OK;
			break;
		}
	}

	return ret;
}

/**
 * Enable or disable a probe on the specified device.
 *
 * @param sdi The device instance the probe is connected to.
 * @param probenum The probe number, starting from 0.
 * @param state TRUE to enable the probe, FALSE to disable.
 *
 * @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
 *
 * @since 0.2.0
 */
SR_API int sr_dev_probe_enable(const struct sr_dev_inst *sdi, int probenum,
		gboolean state)
{
	GSList *l;
	struct sr_probe *probe;
	int ret;

	if (!sdi)
		return SR_ERR_ARG;

	ret = SR_ERR_ARG;
	for (l = sdi->probes; l; l = l->next) {
		probe = l->data;
		if (probe->index == probenum) {
			probe->enabled = state;
			ret = SR_OK;
			break;
		}
	}

	return ret;
}

/**
 * Add a trigger to the specified device (and the specified probe).
 *
 * If the specified probe of this device already has a trigger, it will
 * be silently replaced.
 *
 * @param sdi Must not be NULL.
 * @param probenum The probe number, starting from 0.
 * @param trigger Trigger string, in the format used by sigrok-cli
 *
 * @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
 *
 * @since 0.1.0 (but the API changed in 0.2.0)
 */
SR_API int sr_dev_trigger_set(const struct sr_dev_inst *sdi, int probenum,
		const char *trigger)
{
	GSList *l;
	struct sr_probe *probe;
	int ret;

	if (!sdi)
		return SR_ERR_ARG;

	ret = SR_ERR_ARG;
	for (l = sdi->probes; l; l = l->next) {
		probe = l->data;
		if (probe->index == probenum) {
			/* If the probe already has a trigger, kill it first. */
			g_free(probe->trigger);
			probe->trigger = g_strdup(trigger);
			ret = SR_OK;
			break;
		}
	}

	return ret;
}

/**
 * Determine whether the specified device instance has the specified
 * capability.
 *
 * @param sdi Pointer to the device instance to be checked. Must not be NULL.
 *            If the device's 'driver' field is NULL (virtual device), this
 *            function will always return FALSE (virtual devices don't have
 *            a hardware capabilities list).
 * @param key The option that should be checked for support on the
 *            specified device.
 *
 * @return TRUE if the device has the specified option, FALSE otherwise.
 *         FALSE is also returned on invalid input parameters or other
 *         error conditions.
 *
 * @since 0.1.0 (but the API changed in 0.2.0)
 */
SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
{
	GVariant *gvar;
	const int *devopts;
	gsize num_opts, i;
	int ret;

	if (!sdi || !sdi->driver || !sdi->driver->config_list)
		return FALSE;

	if (sdi->driver->config_list(SR_CONF_DEVICE_OPTIONS, &gvar, NULL) != SR_OK)
		return FALSE;

	ret = FALSE;
	devopts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(int32_t));
	for (i = 0; i < num_opts; i++) {
		if (devopts[i] == key) {
			ret = TRUE;
			break;
		}
	}
	g_variant_unref(gvar);

	return ret;
}

/** @private */
SR_PRIV struct sr_dev_inst *sr_dev_inst_new(int index, int status,
		const char *vendor, const char *model, const char *version)
{
	struct sr_dev_inst *sdi;

	if (!(sdi = g_try_malloc(sizeof(struct sr_dev_inst)))) {
		sr_err("Device instance malloc failed.");
		return NULL;
	}

	sdi->driver = NULL;
	sdi->index = index;
	sdi->status = status;
	sdi->inst_type = -1;
	sdi->vendor = vendor ? g_strdup(vendor) : NULL;
	sdi->model = model ? g_strdup(model) : NULL;
	sdi->version = version ? g_strdup(version) : NULL;
	sdi->probes = NULL;
	sdi->conn = NULL;
	sdi->priv = NULL;

	return sdi;
}

/** @private */
SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
{
	struct sr_probe *probe;
	GSList *l;

	for (l = sdi->probes; l; l = l->next) {
		probe = l->data;
		g_free(probe->name);
		g_free(probe->trigger);
		g_free(probe);
	}
	g_slist_free(sdi->probes);

	g_free(sdi->vendor);
	g_free(sdi->model);
	g_free(sdi->version);
	g_free(sdi);
}

#ifdef HAVE_LIBUSB_1_0

/** @private */
SR_PRIV struct sr_usb_dev_inst *sr_usb_dev_inst_new(uint8_t bus,
			uint8_t address, struct libusb_device_handle *hdl)
{
	struct sr_usb_dev_inst *udi;

	if (!(udi = g_try_malloc(sizeof(struct sr_usb_dev_inst)))) {
		sr_err("USB device instance malloc failed.");
		return NULL;
	}

	udi->bus = bus;
	udi->address = address;
	udi->devhdl = hdl;

	return udi;
}

/** @private */
SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb)
{
	g_free(usb);
}

#endif

/**
 * @private
 *
 * Both parameters are copied to newly allocated strings, and freed
 * automatically by sr_serial_dev_inst_free().
 *
 * @param pathname OS-specific serial port specification. Examples:
 *                 "/dev/ttyUSB0", "/dev/ttyACM1", "/dev/tty.Modem-0", "COM1".
 * @param serialcomm A serial communication parameters string, in the form
 *                   of <speed>/<data bits><parity><stopbits>, for example
 *                   "9600/8n1" or "600/7o2". This is an optional parameter;
 *                   it may be filled in later.
 *
 * @return A pointer to a newly initialized struct sr_serial_dev_inst,
 *         or NULL on error.
 */
SR_PRIV struct sr_serial_dev_inst *sr_serial_dev_inst_new(const char *port,
		const char *serialcomm)
{
	struct sr_serial_dev_inst *serial;

	if (!port) {
		sr_err("Serial port required.");
		return NULL;
	}

	if (!(serial = g_try_malloc0(sizeof(struct sr_serial_dev_inst)))) {
		sr_err("Serial device instance malloc failed.");
		return NULL;
	}

	serial->port = g_strdup(port);
	if (serialcomm)
		serial->serialcomm = g_strdup(serialcomm);
	serial->fd = -1;

	return serial;
}

/** @private */
SR_PRIV void sr_serial_dev_inst_free(struct sr_serial_dev_inst *serial)
{
	g_free(serial->port);
	g_free(serial->serialcomm);
	g_free(serial);
}

/**
 * Get the list of devices/instances of the specified driver.
 *
 * @param driver The driver to use. Must not be NULL.
 *
 * @return The list of devices/instances of this driver, or NULL upon errors
 *         or if the list is empty.
 *
 * @since 0.1.0 (but the API changed in 0.2.0)
 */
SR_API GSList *sr_dev_list(const struct sr_dev_driver *driver)
{
	if (driver && driver->dev_list)
		return driver->dev_list();
	else
		return NULL;
}

/**
 * Clear all devices/instances of the specified driver.
 *
 * @param driver The driver to use. Must not be NULL.
 *
 * @return SR_OK upon success, a negative error code upon errors.
 *
 * @since 0.2.0
 */
SR_API int sr_dev_clear(const struct sr_dev_driver *driver)
{
	if (driver && driver->dev_clear)
		return driver->dev_clear();
	else
		return SR_OK;
}

/**
 * Open the specified device.
 *
 * @param sdi Device instance to use. Must not be NULL.
 *
 * @return SR_OK upon success, a negative error code upon errors.
 *
 * @since 0.2.0
 */
SR_API int sr_dev_open(struct sr_dev_inst *sdi)
{
	int ret;

	if (!sdi || !sdi->driver || !sdi->driver->dev_open)
		return SR_ERR;

	ret = sdi->driver->dev_open(sdi);

	return ret;
}

/**
 * Close the specified device.
 *
 * @param sdi Device instance to use. Must not be NULL.
 *
 * @return SR_OK upon success, a negative error code upon errors.
 *
 * @since 0.2.0
 */
SR_API int sr_dev_close(struct sr_dev_inst *sdi)
{
	int ret;

	if (!sdi || !sdi->driver || !sdi->driver->dev_close)
		return SR_ERR;

	ret = sdi->driver->dev_close(sdi);

	return ret;
}

/** @} */
Commit	Line	Data
	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 <stdio.h>
	21	#include <glib.h>
	22	#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
	23	#include "libsigrok.h"
	24	#include "libsigrok-internal.h"
	25
	26	/* Message logging helpers with subsystem-specific prefix string. */
	27	#define LOG_PREFIX "device: "
	28	#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
	29	#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
	30	#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
	31	#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
	32	#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
	33	#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
	34
	35	/**
	36	* @file
	37	*
	38	* Device handling in libsigrok.
	39	*/
	40
	41	/**
	42	* @defgroup grp_devices Devices
	43	*
	44	* Device handling in libsigrok.
	45	*
	46	* @{
	47	*/
	48
	49	/** @private */
	50	SR_PRIV struct sr_probe *sr_probe_new(int index, int type,
	51	gboolean enabled, const char *name)
	52	{
	53	struct sr_probe *probe;
	54
	55	if (!(probe = g_try_malloc0(sizeof(struct sr_probe)))) {
	56	sr_err("Probe malloc failed.");
	57	return NULL;
	58	}
	59
	60	probe->index = index;
	61	probe->type = type;
	62	probe->enabled = enabled;
	63	if (name)
	64	probe->name = g_strdup(name);
	65
	66	return probe;
	67	}
	68
	69	/**
	70	* Set the name of the specified probe in the specified device.
	71	*
	72	* If the probe already has a different name assigned to it, it will be
	73	* removed, and the new name will be saved instead.
	74	*
	75	* @param sdi The device instance the probe is connected to.
	76	* @param probenum The number of the probe whose name to set.
	77	* Note that the probe numbers start at 0.
	78	* @param name The new name that the specified probe should get. A copy
	79	* of the string is made.
	80	*
	81	* @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
	82	*
	83	* @since 0.1.0 (but the API changed in 0.2.0)
	84	*/
	85	SR_API int sr_dev_probe_name_set(const struct sr_dev_inst *sdi,
	86	int probenum, const char *name)
	87	{
	88	GSList *l;
	89	struct sr_probe *probe;
	90	int ret;
	91
	92	if (!sdi) {
	93	sr_err("%s: sdi was NULL", __func__);
	94	return SR_ERR_ARG;
	95	}
	96
	97	ret = SR_ERR_ARG;
	98	for (l = sdi->probes; l; l = l->next) {
	99	probe = l->data;
	100	if (probe->index == probenum) {
	101	g_free(probe->name);
	102	probe->name = g_strdup(name);
	103	ret = SR_OK;
	104	break;
	105	}
	106	}
	107
	108	return ret;
	109	}
	110
	111	/**
	112	* Enable or disable a probe on the specified device.
	113	*
	114	* @param sdi The device instance the probe is connected to.
	115	* @param probenum The probe number, starting from 0.
	116	* @param state TRUE to enable the probe, FALSE to disable.
	117	*
	118	* @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
	119	*
	120	* @since 0.2.0
	121	*/
	122	SR_API int sr_dev_probe_enable(const struct sr_dev_inst *sdi, int probenum,
	123	gboolean state)
	124	{
	125	GSList *l;
	126	struct sr_probe *probe;
	127	int ret;
	128
	129	if (!sdi)
	130	return SR_ERR_ARG;
	131
	132	ret = SR_ERR_ARG;
	133	for (l = sdi->probes; l; l = l->next) {
	134	probe = l->data;
	135	if (probe->index == probenum) {
	136	probe->enabled = state;
	137	ret = SR_OK;
	138	break;
	139	}
	140	}
	141
	142	return ret;
	143	}
	144
	145	/**
	146	* Add a trigger to the specified device (and the specified probe).
	147	*
	148	* If the specified probe of this device already has a trigger, it will
	149	* be silently replaced.
	150	*
	151	* @param sdi Must not be NULL.
	152	* @param probenum The probe number, starting from 0.
	153	* @param trigger Trigger string, in the format used by sigrok-cli
	154	*
	155	* @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
	156	*
	157	* @since 0.1.0 (but the API changed in 0.2.0)
	158	*/
	159	SR_API int sr_dev_trigger_set(const struct sr_dev_inst *sdi, int probenum,
	160	const char *trigger)
	161	{
	162	GSList *l;
	163	struct sr_probe *probe;
	164	int ret;
	165
	166	if (!sdi)
	167	return SR_ERR_ARG;
	168
	169	ret = SR_ERR_ARG;
	170	for (l = sdi->probes; l; l = l->next) {
	171	probe = l->data;
	172	if (probe->index == probenum) {
	173	/* If the probe already has a trigger, kill it first. */
	174	g_free(probe->trigger);
	175	probe->trigger = g_strdup(trigger);
	176	ret = SR_OK;
	177	break;
	178	}
	179	}
	180
	181	return ret;
	182	}
	183
	184	/**
	185	* Determine whether the specified device instance has the specified
	186	* capability.
	187	*
	188	* @param sdi Pointer to the device instance to be checked. Must not be NULL.
	189	* If the device's 'driver' field is NULL (virtual device), this
	190	* function will always return FALSE (virtual devices don't have
	191	* a hardware capabilities list).
	192	* @param key The option that should be checked for support on the
	193	* specified device.
	194	*
	195	* @return TRUE if the device has the specified option, FALSE otherwise.
	196	* FALSE is also returned on invalid input parameters or other
	197	* error conditions.
	198	*
	199	* @since 0.1.0 (but the API changed in 0.2.0)
	200	*/
	201	SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
	202	{
	203	GVariant *gvar;
	204	const int *devopts;
	205	gsize num_opts, i;
	206	int ret;
	207
	208	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->config_list)
	209	return FALSE;
	210
	211	if (sdi->driver->config_list(SR_CONF_DEVICE_OPTIONS, &gvar, NULL) != SR_OK)
	212	return FALSE;
	213
	214	ret = FALSE;
	215	devopts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(int32_t));
	216	for (i = 0; i < num_opts; i++) {
	217	if (devopts[i] == key) {
	218	ret = TRUE;
	219	break;
	220	}
	221	}
	222	g_variant_unref(gvar);
	223
	224	return ret;
	225	}
	226
	227	/** @private */
	228	SR_PRIV struct sr_dev_inst *sr_dev_inst_new(int index, int status,
	229	const char vendor, const char model, const char *version)
	230	{
	231	struct sr_dev_inst *sdi;
	232
	233	if (!(sdi = g_try_malloc(sizeof(struct sr_dev_inst)))) {
	234	sr_err("Device instance malloc failed.");
	235	return NULL;
	236	}
	237
	238	sdi->driver = NULL;
	239	sdi->index = index;
	240	sdi->status = status;
	241	sdi->inst_type = -1;
	242	sdi->vendor = vendor ? g_strdup(vendor) : NULL;
	243	sdi->model = model ? g_strdup(model) : NULL;
	244	sdi->version = version ? g_strdup(version) : NULL;
	245	sdi->probes = NULL;
	246	sdi->conn = NULL;
	247	sdi->priv = NULL;
	248
	249	return sdi;
	250	}
	251
	252	/** @private */
	253	SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
	254	{
	255	struct sr_probe *probe;
	256	GSList *l;
	257
	258	for (l = sdi->probes; l; l = l->next) {
	259	probe = l->data;
	260	g_free(probe->name);
	261	g_free(probe->trigger);
	262	g_free(probe);
	263	}
	264	g_slist_free(sdi->probes);
	265
	266	g_free(sdi->vendor);
	267	g_free(sdi->model);
	268	g_free(sdi->version);
	269	g_free(sdi);
	270	}
	271
	272	#ifdef HAVE_LIBUSB_1_0
	273
	274	/** @private */
	275	SR_PRIV struct sr_usb_dev_inst *sr_usb_dev_inst_new(uint8_t bus,
	276	uint8_t address, struct libusb_device_handle *hdl)
	277	{
	278	struct sr_usb_dev_inst *udi;
	279
	280	if (!(udi = g_try_malloc(sizeof(struct sr_usb_dev_inst)))) {
	281	sr_err("USB device instance malloc failed.");
	282	return NULL;
	283	}
	284
	285	udi->bus = bus;
	286	udi->address = address;
	287	udi->devhdl = hdl;
	288
	289	return udi;
	290	}
	291
	292	/** @private */
	293	SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb)
	294	{
	295	g_free(usb);
	296	}
	297
	298	#endif
	299
	300	/**
	301	* @private
	302	*
	303	* Both parameters are copied to newly allocated strings, and freed
	304	* automatically by sr_serial_dev_inst_free().
	305	*
	306	* @param pathname OS-specific serial port specification. Examples:
	307	* "/dev/ttyUSB0", "/dev/ttyACM1", "/dev/tty.Modem-0", "COM1".
	308	* @param serialcomm A serial communication parameters string, in the form
	309	* of <speed>/<data bits><parity><stopbits>, for example
	310	* "9600/8n1" or "600/7o2". This is an optional parameter;
	311	* it may be filled in later.
	312	*
	313	* @return A pointer to a newly initialized struct sr_serial_dev_inst,
	314	* or NULL on error.
	315	*/
	316	SR_PRIV struct sr_serial_dev_inst sr_serial_dev_inst_new(const char port,
	317	const char *serialcomm)
	318	{
	319	struct sr_serial_dev_inst *serial;
	320
	321	if (!port) {
	322	sr_err("Serial port required.");
	323	return NULL;
	324	}
	325
	326	if (!(serial = g_try_malloc0(sizeof(struct sr_serial_dev_inst)))) {
	327	sr_err("Serial device instance malloc failed.");
	328	return NULL;
	329	}
	330
	331	serial->port = g_strdup(port);
	332	if (serialcomm)
	333	serial->serialcomm = g_strdup(serialcomm);
	334	serial->fd = -1;
	335
	336	return serial;
	337	}
	338
	339	/** @private */
	340	SR_PRIV void sr_serial_dev_inst_free(struct sr_serial_dev_inst *serial)
	341	{
	342	g_free(serial->port);
	343	g_free(serial->serialcomm);
	344	g_free(serial);
	345	}
	346
	347	/**
	348	* Get the list of devices/instances of the specified driver.
	349	*
	350	* @param driver The driver to use. Must not be NULL.
	351	*
	352	* @return The list of devices/instances of this driver, or NULL upon errors
	353	* or if the list is empty.
	354	*
	355	* @since 0.1.0 (but the API changed in 0.2.0)
	356	*/
	357	SR_API GSList sr_dev_list(const struct sr_dev_driver driver)
	358	{
	359	if (driver && driver->dev_list)
	360	return driver->dev_list();
	361	else
	362	return NULL;
	363	}
	364
	365	/**
	366	* Clear all devices/instances of the specified driver.
	367	*
	368	* @param driver The driver to use. Must not be NULL.
	369	*
	370	* @return SR_OK upon success, a negative error code upon errors.
	371	*
	372	* @since 0.2.0
	373	*/
	374	SR_API int sr_dev_clear(const struct sr_dev_driver *driver)
	375	{
	376	if (driver && driver->dev_clear)
	377	return driver->dev_clear();
	378	else
	379	return SR_OK;
	380	}
	381
	382	/**
	383	* Open the specified device.
	384	*
	385	* @param sdi Device instance to use. Must not be NULL.
	386	*
	387	* @return SR_OK upon success, a negative error code upon errors.
	388	*
	389	* @since 0.2.0
	390	*/
	391	SR_API int sr_dev_open(struct sr_dev_inst *sdi)
	392	{
	393	int ret;
	394
	395	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->dev_open)
	396	return SR_ERR;
	397
	398	ret = sdi->driver->dev_open(sdi);
	399
	400	return ret;
	401	}
	402
	403	/**
	404	* Close the specified device.
	405	*
	406	* @param sdi Device instance to use. Must not be NULL.
	407	*
	408	* @return SR_OK upon success, a negative error code upon errors.
	409	*
	410	* @since 0.2.0
	411	*/
	412	SR_API int sr_dev_close(struct sr_dev_inst *sdi)
	413	{
	414	int ret;
	415
	416	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->dev_close)
	417	return SR_ERR;
	418
	419	ret = sdi->driver->dev_close(sdi);
	420
	421	return ret;
	422	}
	423
	424	/** @} */