[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"

#define LOG_PREFIX "device"

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

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

/** @private
 *  Allocate and initialize new struct sr_channel
 *  @param[in]  index @copydoc sr_channel::index
 *  @param[in]  type @copydoc sr_channel::type
 *  @param[in]  enabled @copydoc sr_channel::enabled
 *  @param[in]  name @copydoc sr_channel::name
 *
 *  @return NULL (failure) or new struct sr_channel*.
 */
SR_PRIV struct sr_channel *sr_probe_new(int index, int type,
		gboolean enabled, const char *name)
{
	struct sr_channel *probe;

	if (!(probe = g_try_malloc0(sizeof(struct sr_channel)))) {
		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[in] probenum The number of the probe whose name to set.
 *                 Note that the probe numbers start at 0.
 * @param[in] 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 0.2.0
 */
SR_API int sr_dev_probe_name_set(const struct sr_dev_inst *sdi,
		int probenum, const char *name)
{
	GSList *l;
	struct sr_channel *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 on failure.  In case of invalid
 *         arguments, SR_ERR_ARG is returned and the probe enabled state
 *         remains unchanged.
 *
 * @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_channel *probe;
	int ret;
	gboolean was_enabled;

	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) {
			was_enabled = probe->enabled;
			probe->enabled = state;
			ret = SR_OK;
			if (!state != !was_enabled && sdi->driver
					&& sdi->driver->config_probe_set) {
				ret = sdi->driver->config_probe_set(
					sdi, probe, SR_PROBE_SET_ENABLED);
				/* Roll back change if it wasn't applicable. */
				if (ret == SR_ERR_ARG)
					probe->enabled = was_enabled;
			}
			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[in,out] sdi Pointer to the device instance; must not be NULL.
 * @param[in] probenum Number of probe, starting at 0.
 * @param[in] trigger Trigger string, in the format used by sigrok-cli
 *
 * @return SR_OK on success or SR_ERR on failure.  In case of invalid
 *         arguments, SR_ERR_ARG is returned and the trigger settings
 *         remain unchanged.
 *
 * @since 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_channel *probe;
	char *old_trigger;
	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) {
			old_trigger = probe->trigger;
			ret = SR_OK;
			if (g_strcmp0(trigger, old_trigger) == 0)
				break;
			/* Set new trigger if it has changed. */
			probe->trigger = g_strdup(trigger);

			if (sdi->driver && sdi->driver->config_probe_set) {
				ret = sdi->driver->config_probe_set(
					sdi, probe, SR_PROBE_SET_TRIGGER);
				/* Roll back change if it wasn't applicable. */
				if (ret == SR_ERR_ARG) {
					g_free(probe->trigger);
					probe->trigger = old_trigger;
					break;
				}
			}
			g_free(old_trigger);
			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[in] key The option that should be checked for is supported by the
 *            specified device.
 *
 * @retval TRUE Device has the specified option
 * @retval FALSE Device does not have the specified option, invalid input
 *         parameters or other error conditions.
 *
 * @since 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, sdi, 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
 *  Allocate and init new device instance struct.
 *  @param[in]  index   @copydoc sr_dev_inst::index
 *  @param[in]  status  @copydoc sr_dev_inst::status
 *  @param[in]  vendor  @copydoc sr_dev_inst::vendor
 *  @param[in]  model   @copydoc sr_dev_inst::model
 *  @param[in]  version @copydoc sr_dev_inst::version
 *
 *  @retval NULL Error
 *  @retval struct sr_dev_inst *. Dynamically allocated, free using
 *              sr_dev_inst_free().
 */
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->channel_groups = NULL;
	sdi->conn = NULL;
	sdi->priv = NULL;

	return sdi;
}

/** @private
 *  Free device instance struct created by sr_dev_inst().
 *  @param sdi  struct* to free.
 */
SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
{
	struct sr_channel *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);

	if (sdi->channel_groups)
		g_slist_free(sdi->channel_groups);

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

#ifdef HAVE_LIBUSB_1_0

/** @private
 *  Allocate and init struct for USB device instance.
 *  @param[in]  bus @copydoc sr_usb_dev_inst::bus
 *  @param[in]  address @copydoc sr_usb_dev_inst::address
 *  @param[in]  hdl @copydoc sr_usb_dev_inst::devhdl
 *
 *  @retval NULL Error
 *  @retval other struct sr_usb_dev_inst * for USB device instance.
 */
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
 *  Free struct * allocated by sr_usb_dev_inst().
 *  @param usb  struct* to free. Must not be NULL.
 */
SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb)
{
	g_free(usb);
}

#endif

#ifdef HAVE_LIBSERIALPORT

/**
 * @private
 *
 * Both parameters are copied to newly allocated strings, and freed
 * automatically by sr_serial_dev_inst_free().
 *
 * @param[in] port OS-specific serial port specification. Examples:
 *                 "/dev/ttyUSB0", "/dev/ttyACM1", "/dev/tty.Modem-0", "COM1".
 * @param[in] 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);

	return serial;
}

/** @private
 *  Free struct sr_serial_dev_inst * allocated by sr_serial_dev_inst().
 *  @param serial   struct sr_serial_dev_inst * to free. Must not be NULL.
 */
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);
}
#endif

/** @private */
SR_PRIV struct sr_usbtmc_dev_inst *sr_usbtmc_dev_inst_new(const char *device)
{
	struct sr_usbtmc_dev_inst *usbtmc;

	if (!device) {
		sr_err("Device name required.");
		return NULL;
	}

	if (!(usbtmc = g_try_malloc0(sizeof(struct sr_usbtmc_dev_inst)))) {
		sr_err("USBTMC device instance malloc failed.");
		return NULL;
	}

	usbtmc->device = g_strdup(device);
	usbtmc->fd = -1;

	return usbtmc;
}

/** @private */
SR_PRIV void sr_usbtmc_dev_inst_free(struct sr_usbtmc_dev_inst *usbtmc)
{
	g_free(usbtmc->device);
	g_free(usbtmc);
}

/**
 * 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 0.2.0
 */
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 the list of device instances a driver knows about.
 *
 * @param driver The driver to use. This must be a pointer to one of
 *               the entries returned by sr_driver_list(). Must not be NULL.
 *
 * @retval SR_OK Success
 * @retval SR_ERR_ARG Invalid driver
 *
 * @since 0.2.0
 */
SR_API int sr_dev_clear(const struct sr_dev_driver *driver)
{
	int ret;

	if (!driver) {
		sr_err("Invalid driver.");
		return SR_ERR_ARG;
	}

	if (driver->dev_clear)
		ret = driver->dev_clear();
	else
		ret = std_dev_clear(driver, NULL);

	return ret;
}

/**
 * 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	#define LOG_PREFIX "device"
	27
	28	/**
	29	* @file
	30	*
	31	* Device handling in libsigrok.
	32	*/
	33
	34	/**
	35	* @defgroup grp_devices Devices
	36	*
	37	* Device handling in libsigrok.
	38	*
	39	* @{
	40	*/
	41
	42	/** @private
	43	* Allocate and initialize new struct sr_channel
	44	* @param[in] index @copydoc sr_channel::index
	45	* @param[in] type @copydoc sr_channel::type
	46	* @param[in] enabled @copydoc sr_channel::enabled
	47	* @param[in] name @copydoc sr_channel::name
	48	*
	49	* @return NULL (failure) or new struct sr_channel*.
	50	*/
	51	SR_PRIV struct sr_channel *sr_probe_new(int index, int type,
	52	gboolean enabled, const char *name)
	53	{
	54	struct sr_channel *probe;
	55
	56	if (!(probe = g_try_malloc0(sizeof(struct sr_channel)))) {
	57	sr_err("Probe malloc failed.");
	58	return NULL;
	59	}
	60
	61	probe->index = index;
	62	probe->type = type;
	63	probe->enabled = enabled;
	64	if (name)
	65	probe->name = g_strdup(name);
	66
	67	return probe;
	68	}
	69
	70	/**
	71	* Set the name of the specified probe in the specified device.
	72	*
	73	* If the probe already has a different name assigned to it, it will be
	74	* removed, and the new name will be saved instead.
	75	*
	76	* @param sdi The device instance the probe is connected to.
	77	* @param[in] probenum The number of the probe whose name to set.
	78	* Note that the probe numbers start at 0.
	79	* @param[in] name The new name that the specified probe should get. A copy
	80	* of the string is made.
	81	*
	82	* @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
	83	*
	84	* @since 0.2.0
	85	*/
	86	SR_API int sr_dev_probe_name_set(const struct sr_dev_inst *sdi,
	87	int probenum, const char *name)
	88	{
	89	GSList *l;
	90	struct sr_channel *probe;
	91	int ret;
	92
	93	if (!sdi) {
	94	sr_err("%s: sdi was NULL", __func__);
	95	return SR_ERR_ARG;
	96	}
	97
	98	ret = SR_ERR_ARG;
	99	for (l = sdi->probes; l; l = l->next) {
	100	probe = l->data;
	101	if (probe->index == probenum) {
	102	g_free(probe->name);
	103	probe->name = g_strdup(name);
	104	ret = SR_OK;
	105	break;
	106	}
	107	}
	108
	109	return ret;
	110	}
	111
	112	/**
	113	* Enable or disable a probe on the specified device.
	114	*
	115	* @param sdi The device instance the probe is connected to.
	116	* @param probenum The probe number, starting from 0.
	117	* @param state TRUE to enable the probe, FALSE to disable.
	118	*
	119	* @return SR_OK on success or SR_ERR on failure. In case of invalid
	120	* arguments, SR_ERR_ARG is returned and the probe enabled state
	121	* remains unchanged.
	122	*
	123	* @since 0.2.0
	124	*/
	125	SR_API int sr_dev_probe_enable(const struct sr_dev_inst *sdi, int probenum,
	126	gboolean state)
	127	{
	128	GSList *l;
	129	struct sr_channel *probe;
	130	int ret;
	131	gboolean was_enabled;
	132
	133	if (!sdi)
	134	return SR_ERR_ARG;
	135
	136	ret = SR_ERR_ARG;
	137	for (l = sdi->probes; l; l = l->next) {
	138	probe = l->data;
	139	if (probe->index == probenum) {
	140	was_enabled = probe->enabled;
	141	probe->enabled = state;
	142	ret = SR_OK;
	143	if (!state != !was_enabled && sdi->driver
	144	&& sdi->driver->config_probe_set) {
	145	ret = sdi->driver->config_probe_set(
	146	sdi, probe, SR_PROBE_SET_ENABLED);
	147	/* Roll back change if it wasn't applicable. */
	148	if (ret == SR_ERR_ARG)
	149	probe->enabled = was_enabled;
	150	}
	151	break;
	152	}
	153	}
	154
	155	return ret;
	156	}
	157
	158	/**
	159	* Add a trigger to the specified device (and the specified probe).
	160	*
	161	* If the specified probe of this device already has a trigger, it will
	162	* be silently replaced.
	163	*
	164	* @param[in,out] sdi Pointer to the device instance; must not be NULL.
	165	* @param[in] probenum Number of probe, starting at 0.
	166	* @param[in] trigger Trigger string, in the format used by sigrok-cli
	167	*
	168	* @return SR_OK on success or SR_ERR on failure. In case of invalid
	169	* arguments, SR_ERR_ARG is returned and the trigger settings
	170	* remain unchanged.
	171	*
	172	* @since 0.2.0
	173	*/
	174	SR_API int sr_dev_trigger_set(const struct sr_dev_inst *sdi, int probenum,
	175	const char *trigger)
	176	{
	177	GSList *l;
	178	struct sr_channel *probe;
	179	char *old_trigger;
	180	int ret;
	181
	182	if (!sdi)
	183	return SR_ERR_ARG;
	184
	185	ret = SR_ERR_ARG;
	186	for (l = sdi->probes; l; l = l->next) {
	187	probe = l->data;
	188	if (probe->index == probenum) {
	189	old_trigger = probe->trigger;
	190	ret = SR_OK;
	191	if (g_strcmp0(trigger, old_trigger) == 0)
	192	break;
	193	/* Set new trigger if it has changed. */
	194	probe->trigger = g_strdup(trigger);
	195
	196	if (sdi->driver && sdi->driver->config_probe_set) {
	197	ret = sdi->driver->config_probe_set(
	198	sdi, probe, SR_PROBE_SET_TRIGGER);
	199	/* Roll back change if it wasn't applicable. */
	200	if (ret == SR_ERR_ARG) {
	201	g_free(probe->trigger);
	202	probe->trigger = old_trigger;
	203	break;
	204	}
	205	}
	206	g_free(old_trigger);
	207	break;
	208	}
	209	}
	210
	211	return ret;
	212	}
	213
	214	/**
	215	* Determine whether the specified device instance has the specified
	216	* capability.
	217	*
	218	* @param sdi Pointer to the device instance to be checked. Must not be NULL.
	219	* If the device's 'driver' field is NULL (virtual device), this
	220	* function will always return FALSE (virtual devices don't have
	221	* a hardware capabilities list).
	222	* @param[in] key The option that should be checked for is supported by the
	223	* specified device.
	224	*
	225	* @retval TRUE Device has the specified option
	226	* @retval FALSE Device does not have the specified option, invalid input
	227	* parameters or other error conditions.
	228	*
	229	* @since 0.2.0
	230	*/
	231	SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
	232	{
	233	GVariant *gvar;
	234	const int *devopts;
	235	gsize num_opts, i;
	236	int ret;
	237
	238	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->config_list)
	239	return FALSE;
	240
	241	if (sdi->driver->config_list(SR_CONF_DEVICE_OPTIONS,
	242	&gvar, sdi, NULL) != SR_OK)
	243	return FALSE;
	244
	245	ret = FALSE;
	246	devopts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(int32_t));
	247	for (i = 0; i < num_opts; i++) {
	248	if (devopts[i] == key) {
	249	ret = TRUE;
	250	break;
	251	}
	252	}
	253	g_variant_unref(gvar);
	254
	255	return ret;
	256	}
	257
	258	/** @private
	259	* Allocate and init new device instance struct.
	260	* @param[in] index @copydoc sr_dev_inst::index
	261	* @param[in] status @copydoc sr_dev_inst::status
	262	* @param[in] vendor @copydoc sr_dev_inst::vendor
	263	* @param[in] model @copydoc sr_dev_inst::model
	264	* @param[in] version @copydoc sr_dev_inst::version
	265	*
	266	* @retval NULL Error
	267	* @retval struct sr_dev_inst *. Dynamically allocated, free using
	268	* sr_dev_inst_free().
	269	*/
	270	SR_PRIV struct sr_dev_inst *sr_dev_inst_new(int index, int status,
	271	const char vendor, const char model, const char *version)
	272	{
	273	struct sr_dev_inst *sdi;
	274
	275	if (!(sdi = g_try_malloc(sizeof(struct sr_dev_inst)))) {
	276	sr_err("Device instance malloc failed.");
	277	return NULL;
	278	}
	279
	280	sdi->driver = NULL;
	281	sdi->index = index;
	282	sdi->status = status;
	283	sdi->inst_type = -1;
	284	sdi->vendor = vendor ? g_strdup(vendor) : NULL;
	285	sdi->model = model ? g_strdup(model) : NULL;
	286	sdi->version = version ? g_strdup(version) : NULL;
	287	sdi->probes = NULL;
	288	sdi->channel_groups = NULL;
	289	sdi->conn = NULL;
	290	sdi->priv = NULL;
	291
	292	return sdi;
	293	}
	294
	295	/** @private
	296	* Free device instance struct created by sr_dev_inst().
	297	* @param sdi struct* to free.
	298	*/
	299	SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
	300	{
	301	struct sr_channel *probe;
	302	GSList *l;
	303
	304	for (l = sdi->probes; l; l = l->next) {
	305	probe = l->data;
	306	g_free(probe->name);
	307	g_free(probe->trigger);
	308	g_free(probe);
	309	}
	310	g_slist_free(sdi->probes);
	311
	312	if (sdi->channel_groups)
	313	g_slist_free(sdi->channel_groups);
	314
	315	g_free(sdi->vendor);
	316	g_free(sdi->model);
	317	g_free(sdi->version);
	318	g_free(sdi);
	319	}
	320
	321	#ifdef HAVE_LIBUSB_1_0
	322
	323	/** @private
	324	* Allocate and init struct for USB device instance.
	325	* @param[in] bus @copydoc sr_usb_dev_inst::bus
	326	* @param[in] address @copydoc sr_usb_dev_inst::address
	327	* @param[in] hdl @copydoc sr_usb_dev_inst::devhdl
	328	*
	329	* @retval NULL Error
	330	* @retval other struct sr_usb_dev_inst * for USB device instance.
	331	*/
	332	SR_PRIV struct sr_usb_dev_inst *sr_usb_dev_inst_new(uint8_t bus,
	333	uint8_t address, struct libusb_device_handle *hdl)
	334	{
	335	struct sr_usb_dev_inst *udi;
	336
	337	if (!(udi = g_try_malloc(sizeof(struct sr_usb_dev_inst)))) {
	338	sr_err("USB device instance malloc failed.");
	339	return NULL;
	340	}
	341
	342	udi->bus = bus;
	343	udi->address = address;
	344	udi->devhdl = hdl;
	345
	346	return udi;
	347	}
	348
	349	/** @private
	350	* Free struct * allocated by sr_usb_dev_inst().
	351	* @param usb struct* to free. Must not be NULL.
	352	*/
	353	SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb)
	354	{
	355	g_free(usb);
	356	}
	357
	358	#endif
	359
	360	#ifdef HAVE_LIBSERIALPORT
	361
	362	/**
	363	* @private
	364	*
	365	* Both parameters are copied to newly allocated strings, and freed
	366	* automatically by sr_serial_dev_inst_free().
	367	*
	368	* @param[in] port OS-specific serial port specification. Examples:
	369	* "/dev/ttyUSB0", "/dev/ttyACM1", "/dev/tty.Modem-0", "COM1".
	370	* @param[in] serialcomm A serial communication parameters string, in the form
	371	* of \<speed\>/\<data bits\>\<parity\>\<stopbits\>, for example
	372	* "9600/8n1" or "600/7o2". This is an optional parameter;
	373	* it may be filled in later.
	374	*
	375	* @return A pointer to a newly initialized struct sr_serial_dev_inst,
	376	* or NULL on error.
	377	*/
	378	SR_PRIV struct sr_serial_dev_inst sr_serial_dev_inst_new(const char port,
	379	const char *serialcomm)
	380	{
	381	struct sr_serial_dev_inst *serial;
	382
	383	if (!port) {
	384	sr_err("Serial port required.");
	385	return NULL;
	386	}
	387
	388	if (!(serial = g_try_malloc0(sizeof(struct sr_serial_dev_inst)))) {
	389	sr_err("Serial device instance malloc failed.");
	390	return NULL;
	391	}
	392
	393	serial->port = g_strdup(port);
	394	if (serialcomm)
	395	serial->serialcomm = g_strdup(serialcomm);
	396
	397	return serial;
	398	}
	399
	400	/** @private
	401	* Free struct sr_serial_dev_inst * allocated by sr_serial_dev_inst().
	402	* @param serial struct sr_serial_dev_inst * to free. Must not be NULL.
	403	*/
	404	SR_PRIV void sr_serial_dev_inst_free(struct sr_serial_dev_inst *serial)
	405	{
	406	g_free(serial->port);
	407	g_free(serial->serialcomm);
	408	g_free(serial);
	409	}
	410	#endif
	411
	412	/** @private */
	413	SR_PRIV struct sr_usbtmc_dev_inst sr_usbtmc_dev_inst_new(const char device)
	414	{
	415	struct sr_usbtmc_dev_inst *usbtmc;
	416
	417	if (!device) {
	418	sr_err("Device name required.");
	419	return NULL;
	420	}
	421
	422	if (!(usbtmc = g_try_malloc0(sizeof(struct sr_usbtmc_dev_inst)))) {
	423	sr_err("USBTMC device instance malloc failed.");
	424	return NULL;
	425	}
	426
	427	usbtmc->device = g_strdup(device);
	428	usbtmc->fd = -1;
	429
	430	return usbtmc;
	431	}
	432
	433	/** @private */
	434	SR_PRIV void sr_usbtmc_dev_inst_free(struct sr_usbtmc_dev_inst *usbtmc)
	435	{
	436	g_free(usbtmc->device);
	437	g_free(usbtmc);
	438	}
	439
	440	/**
	441	* Get the list of devices/instances of the specified driver.
	442	*
	443	* @param driver The driver to use. Must not be NULL.
	444	*
	445	* @return The list of devices/instances of this driver, or NULL upon errors
	446	* or if the list is empty.
	447	*
	448	* @since 0.2.0
	449	*/
	450	SR_API GSList sr_dev_list(const struct sr_dev_driver driver)
	451	{
	452	if (driver && driver->dev_list)
	453	return driver->dev_list();
	454	else
	455	return NULL;
	456	}
	457
	458	/**
	459	* Clear the list of device instances a driver knows about.
	460	*
	461	* @param driver The driver to use. This must be a pointer to one of
	462	* the entries returned by sr_driver_list(). Must not be NULL.
	463	*
	464	* @retval SR_OK Success
	465	* @retval SR_ERR_ARG Invalid driver
	466	*
	467	* @since 0.2.0
	468	*/
	469	SR_API int sr_dev_clear(const struct sr_dev_driver *driver)
	470	{
	471	int ret;
	472
	473	if (!driver) {
	474	sr_err("Invalid driver.");
	475	return SR_ERR_ARG;
	476	}
	477
	478	if (driver->dev_clear)
	479	ret = driver->dev_clear();
	480	else
	481	ret = std_dev_clear(driver, NULL);
	482
	483	return ret;
	484	}
	485
	486	/**
	487	* Open the specified device.
	488	*
	489	* @param sdi Device instance to use. Must not be NULL.
	490	*
	491	* @return SR_OK upon success, a negative error code upon errors.
	492	*
	493	* @since 0.2.0
	494	*/
	495	SR_API int sr_dev_open(struct sr_dev_inst *sdi)
	496	{
	497	int ret;
	498
	499	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->dev_open)
	500	return SR_ERR;
	501
	502	ret = sdi->driver->dev_open(sdi);
	503
	504	return ret;
	505	}
	506
	507	/**
	508	* Close the specified device.
	509	*
	510	* @param sdi Device instance to use. Must not be NULL.
	511	*
	512	* @return SR_OK upon success, a negative error code upon errors.
	513	*
	514	* @since 0.2.0
	515	*/
	516	SR_API int sr_dev_close(struct sr_dev_inst *sdi)
	517	{
	518	int ret;
	519
	520	if (!sdi \|\| !sdi->driver \|\| !sdi->driver->dev_close)
	521	return SR_ERR;
	522
	523	ret = sdi->driver->dev_close(sdi);
	524
	525	return ret;
	526	}
	527
	528	/** @} */