[libsigrok.git] / src / hardware / lascar-el-usb / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 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 <config.h>
#include <glib.h>
#include <libusb.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "protocol.h"

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
};

static const uint32_t devopts[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_HYGROMETER,
	SR_CONF_CONN | SR_CONF_GET,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_DATALOG | SR_CONF_GET | SR_CONF_SET,
};

static GSList *scan(struct sr_dev_driver *di, GSList *options)
{
	struct drv_context *drvc;
	struct sr_dev_inst *sdi;
	struct sr_usb_dev_inst *usb;
	struct sr_config *src;
	GSList *usb_devices, *devices, *l;
	const char *conn;

	drvc = di->context;

	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		}
	}
	if (!conn)
		return NULL;

	devices = NULL;
	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
		/* We have a list of sr_usb_dev_inst matching the connection
		 * string. Wrap them in sr_dev_inst and we're done. */
		for (l = usb_devices; l; l = l->next) {
			usb = l->data;
			if (!(sdi = lascar_scan(usb->bus, usb->address))) {
				/* Not a Lascar EL-USB. */
				g_free(usb);
				continue;
			}
			sdi->inst_type = SR_INST_USB;
			sdi->conn = usb;
			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return std_scan_complete(di, devices);
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc = di->context;;
	struct sr_usb_dev_inst *usb;
	int ret;

	usb = sdi->conn;

	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
		return SR_ERR;

	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
		sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;

	usb = sdi->conn;

	if (!usb->devhdl)
		/* Nothing to do. */
		return SR_OK;

	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int ret;
	char str[128];

	(void)cg;

	devc = sdi->priv;
	switch (key) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		snprintf(str, 128, "%d.%d", usb->bus, usb->address);
		*data = g_variant_new_string(str);
		break;
	case SR_CONF_DATALOG:
		if (!sdi)
			return SR_ERR_ARG;
		if ((ret = lascar_is_logging(sdi)) == -1)
			return SR_ERR;
		*data = g_variant_new_boolean(ret ? TRUE : FALSE);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	int ret;

	(void)cg;

	devc = sdi->priv;
	ret = SR_OK;
	switch (key) {
	case SR_CONF_DATALOG:
		if (g_variant_get_boolean(data))
			ret = lascar_start_logging(sdi);
		else
			ret = lascar_stop_logging(sdi);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void LIBUSB_CALL mark_xfer(struct libusb_transfer *xfer)
{

	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
		xfer->user_data = GINT_TO_POINTER(1);
	else
		xfer->user_data = GINT_TO_POINTER(-1);

}

/* The Lascar software, in its infinite ignorance, reads a set of four
 * bytes from the device config struct and interprets it as a float.
 * That only works because they only use windows, and only on x86. However
 * we may be running on any architecture, any operating system. So we have
 * to convert these four bytes as the Lascar software would on windows/x86,
 * to the local representation of a float.
 * The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
static float binary32_le_to_float(unsigned char *buf)
{
	GFloatIEEE754 f;

	f.v_float = 0;
	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	f.mpn.biased_exponent = (buf[3] << 1) | (buf[2] >> 7);
	f.mpn.mantissa = buf[0] | (buf[1] << 8) | ((buf[2] & 0x7f) << 16);

	return f.v_float;
}

static int lascar_proc_config(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int dummy, ret;

	devc = sdi->priv;
	usb = sdi->conn;

	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
		return SR_ERR;

	ret = SR_OK;
	switch (devc->profile->logformat) {
	case LOG_TEMP_RH:
		devc->sample_size = 2;
		devc->temp_unit = devc->config[0x2e] | (devc->config[0x2f] << 8);
		if (devc->temp_unit != 0 && devc->temp_unit != 1) {
			sr_dbg("invalid temperature unit %d", devc->temp_unit);
			/* Default to Celsius, we're all adults here. */
			devc->temp_unit = 0;
		} else
			sr_dbg("temperature unit is %s", devc->temp_unit
					? "Fahrenheit" : "Celsius");
		break;
	case LOG_CO:
		devc->sample_size = 2;
		devc->co_high = binary32_le_to_float(devc->config + 0x24);
		devc->co_low = binary32_le_to_float(devc->config + 0x28);
		sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
				devc->co_low);
		break;
	default:
		ret = SR_ERR_ARG;
	}
	devc->logged_samples = devc->config[0x1e] | (devc->config[0x1f] << 8);
	sr_dbg("device log contains %d samples.", devc->logged_samples);

	return ret;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_config *src;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *xfer_in, *xfer_out;
	struct timeval tv;
	uint64_t interval;
	int ret;
	unsigned char cmd[3], resp[4], *buf;

	drvc = di->context;
	devc = sdi->priv;
	usb = sdi->conn;

	if (lascar_proc_config(sdi) != SR_OK)
		return SR_ERR;

	sr_dbg("Starting log retrieval.");

	std_session_send_df_header(sdi);

	interval = (devc->config[0x1c] | (devc->config[0x1d] << 8)) * 1000;
	packet.type = SR_DF_META;
	packet.payload = &meta;
	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
	meta.config = g_slist_append(NULL, src);
	sr_session_send(sdi, &packet);
	g_free(src);

	if (devc->logged_samples == 0) {
		/* This ensures the frontend knows the session is done. */
		std_session_send_df_end(sdi);
		return SR_OK;
	}

	if (!(xfer_in = libusb_alloc_transfer(0)) ||
			!(xfer_out = libusb_alloc_transfer(0)))
		return SR_ERR;

	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x00, 0xffff, 0x00, NULL, 0, 50);
	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x02, 0x0002, 0x00, NULL, 0, 50);
	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x02, 0x0001, 0x00, NULL, 0, 50);

	/* Flush input. The F321 requires this. */
	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
			256, &ret, 5) == 0 && ret > 0)
		;

	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
			resp, sizeof(resp), mark_xfer, 0, BULK_XFER_TIMEOUT);
	if (libusb_submit_transfer(xfer_in) != 0) {
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}

	cmd[0] = 0x03;
	cmd[1] = 0xff;
	cmd[2] = 0xff;
	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
			cmd, 3, mark_xfer, 0, 100);
	if (libusb_submit_transfer(xfer_out) != 0) {
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}

	tv.tv_sec = 0;
	tv.tv_usec = 0;
	while (!xfer_in->user_data || !xfer_out->user_data) {
		g_usleep(SLEEP_US_LONG);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}
	if (xfer_in->user_data != GINT_TO_POINTER(1) ||
			xfer_out->user_data != GINT_TO_POINTER(1)) {
		sr_dbg("no response to log transfer request");
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}
	if (xfer_in->actual_length != 3 || xfer_in->buffer[0] != 2) {
		sr_dbg("invalid response to log transfer request");
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}
	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	libusb_free_transfer(xfer_out);

	usb_source_add(sdi->session, drvc->sr_ctx, 100,
			lascar_el_usb_handle_events, (void *)sdi);

	buf = g_malloc(4096);
	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
			buf, 4096, lascar_el_usb_receive_transfer,
			(struct sr_dev_inst *)sdi, 100);
	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
		sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
		libusb_free_transfer(xfer_in);
		g_free(buf);
		return SR_ERR;
	}

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	sdi->status = SR_ST_STOPPING;
	/* TODO: free ongoing transfers? */

	return SR_OK;
}

SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	.name = "lascar-el-usb",
	.longname = "Lascar EL-USB",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = std_dev_list,
	.dev_clear = NULL,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(lascar_el_usb_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2012 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 <config.h>
	21	#include <glib.h>
	22	#include <libusb.h>
	23	#include <libsigrok/libsigrok.h>
	24	#include "libsigrok-internal.h"
	25	#include "protocol.h"
	26
	27	static const uint32_t scanopts[] = {
	28	SR_CONF_CONN,
	29	};
	30
	31	static const uint32_t devopts[] = {
	32	SR_CONF_THERMOMETER,
	33	SR_CONF_HYGROMETER,
	34	SR_CONF_CONN \| SR_CONF_GET,
	35	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	36	SR_CONF_DATALOG \| SR_CONF_GET \| SR_CONF_SET,
	37	};
	38
	39	static GSList scan(struct sr_dev_driver di, GSList *options)
	40	{
	41	struct drv_context *drvc;
	42	struct sr_dev_inst *sdi;
	43	struct sr_usb_dev_inst *usb;
	44	struct sr_config *src;
	45	GSList usb_devices, devices, *l;
	46	const char *conn;
	47
	48	drvc = di->context;
	49
	50	conn = NULL;
	51	for (l = options; l; l = l->next) {
	52	src = l->data;
	53	switch (src->key) {
	54	case SR_CONF_CONN:
	55	conn = g_variant_get_string(src->data, NULL);
	56	break;
	57	}
	58	}
	59	if (!conn)
	60	return NULL;
	61
	62	devices = NULL;
	63	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	64	/* We have a list of sr_usb_dev_inst matching the connection
	65	* string. Wrap them in sr_dev_inst and we're done. */
	66	for (l = usb_devices; l; l = l->next) {
	67	usb = l->data;
	68	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	69	/* Not a Lascar EL-USB. */
	70	g_free(usb);
	71	continue;
	72	}
	73	sdi->inst_type = SR_INST_USB;
	74	sdi->conn = usb;
	75	devices = g_slist_append(devices, sdi);
	76	}
	77	g_slist_free(usb_devices);
	78	} else
	79	g_slist_free_full(usb_devices, g_free);
	80
	81	return std_scan_complete(di, devices);
	82	}
	83
	84	static int dev_open(struct sr_dev_inst *sdi)
	85	{
	86	struct sr_dev_driver *di = sdi->driver;
	87	struct drv_context *drvc = di->context;;
	88	struct sr_usb_dev_inst *usb;
	89	int ret;
	90
	91	usb = sdi->conn;
	92
	93	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	94	return SR_ERR;
	95
	96	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
	97	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	98	return SR_ERR;
	99	}
	100
	101	return SR_OK;
	102	}
	103
	104	static int dev_close(struct sr_dev_inst *sdi)
	105	{
	106	struct sr_usb_dev_inst *usb;
	107
	108	usb = sdi->conn;
	109
	110	if (!usb->devhdl)
	111	/* Nothing to do. */
	112	return SR_OK;
	113
	114	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	115	libusb_close(usb->devhdl);
	116	usb->devhdl = NULL;
	117	sdi->status = SR_ST_INACTIVE;
	118
	119	return SR_OK;
	120	}
	121
	122	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	123	const struct sr_channel_group *cg)
	124	{
	125	struct dev_context *devc;
	126	struct sr_usb_dev_inst *usb;
	127	int ret;
	128	char str[128];
	129
	130	(void)cg;
	131
	132	devc = sdi->priv;
	133	switch (key) {
	134	case SR_CONF_CONN:
	135	if (!sdi \|\| !sdi->conn)
	136	return SR_ERR_ARG;
	137	usb = sdi->conn;
	138	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	139	*data = g_variant_new_string(str);
	140	break;
	141	case SR_CONF_DATALOG:
	142	if (!sdi)
	143	return SR_ERR_ARG;
	144	if ((ret = lascar_is_logging(sdi)) == -1)
	145	return SR_ERR;
	146	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
	147	break;
	148	case SR_CONF_LIMIT_SAMPLES:
	149	*data = g_variant_new_uint64(devc->limit_samples);
	150	break;
	151	default:
	152	return SR_ERR_NA;
	153	}
	154
	155	return SR_OK;
	156	}
	157
	158	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	159	const struct sr_channel_group *cg)
	160	{
	161	struct dev_context *devc;
	162	int ret;
	163
	164	(void)cg;
	165
	166	devc = sdi->priv;
	167	ret = SR_OK;
	168	switch (key) {
	169	case SR_CONF_DATALOG:
	170	if (g_variant_get_boolean(data))
	171	ret = lascar_start_logging(sdi);
	172	else
	173	ret = lascar_stop_logging(sdi);
	174	break;
	175	case SR_CONF_LIMIT_SAMPLES:
	176	devc->limit_samples = g_variant_get_uint64(data);
	177	break;
	178	default:
	179	ret = SR_ERR_NA;
	180	}
	181
	182	return ret;
	183	}
	184
	185	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	186	const struct sr_channel_group *cg)
	187	{
	188	(void)sdi;
	189	(void)cg;
	190
	191	switch (key) {
	192	case SR_CONF_SCAN_OPTIONS:
	193	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	194	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	195	break;
	196	case SR_CONF_DEVICE_OPTIONS:
	197	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	198	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	199	break;
	200	default:
	201	return SR_ERR_NA;
	202	}
	203
	204	return SR_OK;
	205	}
	206
	207	static void LIBUSB_CALL mark_xfer(struct libusb_transfer *xfer)
	208	{
	209
	210	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	211	xfer->user_data = GINT_TO_POINTER(1);
	212	else
	213	xfer->user_data = GINT_TO_POINTER(-1);
	214
	215	}
	216
	217	/* The Lascar software, in its infinite ignorance, reads a set of four
	218	* bytes from the device config struct and interprets it as a float.
	219	* That only works because they only use windows, and only on x86. However
	220	* we may be running on any architecture, any operating system. So we have
	221	* to convert these four bytes as the Lascar software would on windows/x86,
	222	* to the local representation of a float.
	223	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	224	static float binary32_le_to_float(unsigned char *buf)
	225	{
	226	GFloatIEEE754 f;
	227
	228	f.v_float = 0;
	229	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	230	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	231	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	232
	233	return f.v_float;
	234	}
	235
	236	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	237	{
	238	struct dev_context *devc;
	239	struct sr_usb_dev_inst *usb;
	240	int dummy, ret;
	241
	242	devc = sdi->priv;
	243	usb = sdi->conn;
	244
	245	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
	246	return SR_ERR;
	247
	248	ret = SR_OK;
	249	switch (devc->profile->logformat) {
	250	case LOG_TEMP_RH:
	251	devc->sample_size = 2;
	252	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	253	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	254	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	255	/* Default to Celsius, we're all adults here. */
	256	devc->temp_unit = 0;
	257	} else
	258	sr_dbg("temperature unit is %s", devc->temp_unit
	259	? "Fahrenheit" : "Celsius");
	260	break;
	261	case LOG_CO:
	262	devc->sample_size = 2;
	263	devc->co_high = binary32_le_to_float(devc->config + 0x24);
	264	devc->co_low = binary32_le_to_float(devc->config + 0x28);
	265	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	266	devc->co_low);
	267	break;
	268	default:
	269	ret = SR_ERR_ARG;
	270	}
	271	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	272	sr_dbg("device log contains %d samples.", devc->logged_samples);
	273
	274	return ret;
	275	}
	276
	277	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	278	{
	279	struct sr_dev_driver *di = sdi->driver;
	280	struct sr_datafeed_packet packet;
	281	struct sr_datafeed_meta meta;
	282	struct sr_config *src;
	283	struct dev_context *devc;
	284	struct drv_context *drvc;
	285	struct sr_usb_dev_inst *usb;
	286	struct libusb_transfer xfer_in, xfer_out;
	287	struct timeval tv;
	288	uint64_t interval;
	289	int ret;
	290	unsigned char cmd[3], resp[4], *buf;
	291
	292	drvc = di->context;
	293	devc = sdi->priv;
	294	usb = sdi->conn;
	295
	296	if (lascar_proc_config(sdi) != SR_OK)
	297	return SR_ERR;
	298
	299	sr_dbg("Starting log retrieval.");
	300
	301	std_session_send_df_header(sdi);
	302
	303	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	304	packet.type = SR_DF_META;
	305	packet.payload = &meta;
	306	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
	307	meta.config = g_slist_append(NULL, src);
	308	sr_session_send(sdi, &packet);
	309	g_free(src);
	310
	311	if (devc->logged_samples == 0) {
	312	/* This ensures the frontend knows the session is done. */
	313	std_session_send_df_end(sdi);
	314	return SR_OK;
	315	}
	316
	317	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	318	!(xfer_out = libusb_alloc_transfer(0)))
	319	return SR_ERR;
	320
	321	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	322	0x00, 0xffff, 0x00, NULL, 0, 50);
	323	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	324	0x02, 0x0002, 0x00, NULL, 0, 50);
	325	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	326	0x02, 0x0001, 0x00, NULL, 0, 50);
	327
	328	/* Flush input. The F321 requires this. */
	329	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
	330	256, &ret, 5) == 0 && ret > 0)
	331	;
	332
	333	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
	334	resp, sizeof(resp), mark_xfer, 0, BULK_XFER_TIMEOUT);
	335	if (libusb_submit_transfer(xfer_in) != 0) {
	336	libusb_free_transfer(xfer_in);
	337	libusb_free_transfer(xfer_out);
	338	return SR_ERR;
	339	}
	340
	341	cmd[0] = 0x03;
	342	cmd[1] = 0xff;
	343	cmd[2] = 0xff;
	344	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
	345	cmd, 3, mark_xfer, 0, 100);
	346	if (libusb_submit_transfer(xfer_out) != 0) {
	347	libusb_free_transfer(xfer_in);
	348	libusb_free_transfer(xfer_out);
	349	return SR_ERR;
	350	}
	351
	352	tv.tv_sec = 0;
	353	tv.tv_usec = 0;
	354	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	355	g_usleep(SLEEP_US_LONG);
	356	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	357	}
	358	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	359	xfer_out->user_data != GINT_TO_POINTER(1)) {
	360	sr_dbg("no response to log transfer request");
	361	libusb_free_transfer(xfer_in);
	362	libusb_free_transfer(xfer_out);
	363	return SR_ERR;
	364	}
	365	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	366	sr_dbg("invalid response to log transfer request");
	367	libusb_free_transfer(xfer_in);
	368	libusb_free_transfer(xfer_out);
	369	return SR_ERR;
	370	}
	371	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	372	libusb_free_transfer(xfer_out);
	373
	374	usb_source_add(sdi->session, drvc->sr_ctx, 100,
	375	lascar_el_usb_handle_events, (void *)sdi);
	376
	377	buf = g_malloc(4096);
	378	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
	379	buf, 4096, lascar_el_usb_receive_transfer,
	380	(struct sr_dev_inst *)sdi, 100);
	381	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	382	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	383	libusb_free_transfer(xfer_in);
	384	g_free(buf);
	385	return SR_ERR;
	386	}
	387
	388	return SR_OK;
	389	}
	390
	391	static int dev_acquisition_stop(struct sr_dev_inst *sdi)
	392	{
	393	sdi->status = SR_ST_STOPPING;
	394	/* TODO: free ongoing transfers? */
	395
	396	return SR_OK;
	397	}
	398
	399	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	400	.name = "lascar-el-usb",
	401	.longname = "Lascar EL-USB",
	402	.api_version = 1,
	403	.init = std_init,
	404	.cleanup = std_cleanup,
	405	.scan = scan,
	406	.dev_list = std_dev_list,
	407	.dev_clear = NULL,
	408	.config_get = config_get,
	409	.config_set = config_set,
	410	.config_list = config_list,
	411	.dev_open = dev_open,
	412	.dev_close = dev_close,
	413	.dev_acquisition_start = dev_acquisition_start,
	414	.dev_acquisition_stop = dev_acquisition_stop,
	415	.context = NULL,
	416	};
	417	SR_REGISTER_DEV_DRIVER(lascar_el_usb_driver_info);