[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"

SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;

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 int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

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;
			drvc->instances = g_slist_append(drvc->instances, sdi);
			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return devices;
}

static GSList *dev_list(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->context))->instances;
}

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

	if (!(drvc = di->context)) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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;
	}
	sdi->status = SR_ST_ACTIVE;

	return ret;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct sr_usb_dev_inst *usb;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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 sr_dev_driver *di = sdi->driver;
	struct dev_context *devc;
	int ret;

	(void)cg;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	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, LOG_PREFIX);

	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, LOG_PREFIX);
		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;
}

SR_PRIV int dev_acquisition_stop(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;

	if (!di->context) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't stop acquisition.");
		return SR_ERR;
	}

	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 = init,
	.cleanup = std_cleanup,
	.scan = scan,
	.dev_list = 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,
};
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	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
	28
	29	static const uint32_t scanopts[] = {
	30	SR_CONF_CONN,
	31	};
	32
	33	static const uint32_t devopts[] = {
	34	SR_CONF_THERMOMETER,
	35	SR_CONF_HYGROMETER,
	36	SR_CONF_CONN \| SR_CONF_GET,
	37	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	38	SR_CONF_DATALOG \| SR_CONF_GET \| SR_CONF_SET,
	39	};
	40
	41	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
	42	{
	43	return std_init(sr_ctx, di, LOG_PREFIX);
	44	}
	45
	46	static GSList scan(struct sr_dev_driver di, GSList *options)
	47	{
	48	struct drv_context *drvc;
	49	struct sr_dev_inst *sdi;
	50	struct sr_usb_dev_inst *usb;
	51	struct sr_config *src;
	52	GSList usb_devices, devices, *l;
	53	const char *conn;
	54
	55	drvc = di->context;
	56
	57	conn = NULL;
	58	for (l = options; l; l = l->next) {
	59	src = l->data;
	60	switch (src->key) {
	61	case SR_CONF_CONN:
	62	conn = g_variant_get_string(src->data, NULL);
	63	break;
	64	}
	65	}
	66	if (!conn)
	67	return NULL;
	68
	69	devices = NULL;
	70	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	71	/* We have a list of sr_usb_dev_inst matching the connection
	72	* string. Wrap them in sr_dev_inst and we're done. */
	73	for (l = usb_devices; l; l = l->next) {
	74	usb = l->data;
	75	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	76	/* Not a Lascar EL-USB. */
	77	g_free(usb);
	78	continue;
	79	}
	80	sdi->inst_type = SR_INST_USB;
	81	sdi->conn = usb;
	82	drvc->instances = g_slist_append(drvc->instances, sdi);
	83	devices = g_slist_append(devices, sdi);
	84	}
	85	g_slist_free(usb_devices);
	86	} else
	87	g_slist_free_full(usb_devices, g_free);
	88
	89	return devices;
	90	}
	91
	92	static GSList dev_list(const struct sr_dev_driver di)
	93	{
	94	return ((struct drv_context *)(di->context))->instances;
	95	}
	96
	97	static int dev_open(struct sr_dev_inst *sdi)
	98	{
	99	struct sr_dev_driver *di = sdi->driver;
	100	struct drv_context *drvc;
	101	struct sr_usb_dev_inst *usb;
	102	int ret;
	103
	104	if (!(drvc = di->context)) {
	105	sr_err("Driver was not initialized.");
	106	return SR_ERR;
	107	}
	108
	109	usb = sdi->conn;
	110
	111	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	112	return SR_ERR;
	113
	114	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
	115	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	116	return SR_ERR;
	117	}
	118	sdi->status = SR_ST_ACTIVE;
	119
	120	return ret;
	121	}
	122
	123	static int dev_close(struct sr_dev_inst *sdi)
	124	{
	125	struct sr_dev_driver *di = sdi->driver;
	126	struct sr_usb_dev_inst *usb;
	127
	128	if (!di->context) {
	129	sr_err("Driver was not initialized.");
	130	return SR_ERR;
	131	}
	132
	133	usb = sdi->conn;
	134
	135	if (!usb->devhdl)
	136	/* Nothing to do. */
	137	return SR_OK;
	138
	139	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	140	libusb_close(usb->devhdl);
	141	usb->devhdl = NULL;
	142	sdi->status = SR_ST_INACTIVE;
	143
	144	return SR_OK;
	145	}
	146
	147	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	148	const struct sr_channel_group *cg)
	149	{
	150	struct dev_context *devc;
	151	struct sr_usb_dev_inst *usb;
	152	int ret;
	153	char str[128];
	154
	155	(void)cg;
	156
	157	devc = sdi->priv;
	158	switch (key) {
	159	case SR_CONF_CONN:
	160	if (!sdi \|\| !sdi->conn)
	161	return SR_ERR_ARG;
	162	usb = sdi->conn;
	163	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	164	*data = g_variant_new_string(str);
	165	break;
	166	case SR_CONF_DATALOG:
	167	if (!sdi)
	168	return SR_ERR_ARG;
	169	if ((ret = lascar_is_logging(sdi)) == -1)
	170	return SR_ERR;
	171	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
	172	break;
	173	case SR_CONF_LIMIT_SAMPLES:
	174	*data = g_variant_new_uint64(devc->limit_samples);
	175	break;
	176	default:
	177	return SR_ERR_NA;
	178	}
	179
	180	return SR_OK;
	181	}
	182
	183	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
	184	const struct sr_channel_group *cg)
	185	{
	186	struct sr_dev_driver *di = sdi->driver;
	187	struct dev_context *devc;
	188	int ret;
	189
	190	(void)cg;
	191
	192	if (sdi->status != SR_ST_ACTIVE)
	193	return SR_ERR_DEV_CLOSED;
	194
	195	if (!di->context) {
	196	sr_err("Driver was not initialized.");
	197	return SR_ERR;
	198	}
	199
	200	devc = sdi->priv;
	201	ret = SR_OK;
	202	switch (key) {
	203	case SR_CONF_DATALOG:
	204	if (g_variant_get_boolean(data))
	205	ret = lascar_start_logging(sdi);
	206	else
	207	ret = lascar_stop_logging(sdi);
	208	break;
	209	case SR_CONF_LIMIT_SAMPLES:
	210	devc->limit_samples = g_variant_get_uint64(data);
	211	break;
	212	default:
	213	ret = SR_ERR_NA;
	214	}
	215
	216	return ret;
	217	}
	218
	219	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	220	const struct sr_channel_group *cg)
	221	{
	222	(void)sdi;
	223	(void)cg;
	224
	225	switch (key) {
	226	case SR_CONF_SCAN_OPTIONS:
	227	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	228	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
	229	break;
	230	case SR_CONF_DEVICE_OPTIONS:
	231	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
	232	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
	233	break;
	234	default:
	235	return SR_ERR_NA;
	236	}
	237
	238	return SR_OK;
	239	}
	240
	241	static void LIBUSB_CALL mark_xfer(struct libusb_transfer *xfer)
	242	{
	243
	244	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	245	xfer->user_data = GINT_TO_POINTER(1);
	246	else
	247	xfer->user_data = GINT_TO_POINTER(-1);
	248
	249	}
	250
	251	/* The Lascar software, in its infinite ignorance, reads a set of four
	252	* bytes from the device config struct and interprets it as a float.
	253	* That only works because they only use windows, and only on x86. However
	254	* we may be running on any architecture, any operating system. So we have
	255	* to convert these four bytes as the Lascar software would on windows/x86,
	256	* to the local representation of a float.
	257	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	258	static float binary32_le_to_float(unsigned char *buf)
	259	{
	260	GFloatIEEE754 f;
	261
	262	f.v_float = 0;
	263	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	264	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	265	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	266
	267	return f.v_float;
	268	}
	269
	270	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	271	{
	272	struct dev_context *devc;
	273	struct sr_usb_dev_inst *usb;
	274	int dummy, ret;
	275
	276	devc = sdi->priv;
	277	usb = sdi->conn;
	278
	279	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
	280	return SR_ERR;
	281
	282	ret = SR_OK;
	283	switch (devc->profile->logformat) {
	284	case LOG_TEMP_RH:
	285	devc->sample_size = 2;
	286	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	287	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	288	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	289	/* Default to Celsius, we're all adults here. */
	290	devc->temp_unit = 0;
	291	} else
	292	sr_dbg("temperature unit is %s", devc->temp_unit
	293	? "Fahrenheit" : "Celsius");
	294	break;
	295	case LOG_CO:
	296	devc->sample_size = 2;
	297	devc->co_high = binary32_le_to_float(devc->config + 0x24);
	298	devc->co_low = binary32_le_to_float(devc->config + 0x28);
	299	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	300	devc->co_low);
	301	break;
	302	default:
	303	ret = SR_ERR_ARG;
	304	}
	305	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	306	sr_dbg("device log contains %d samples.", devc->logged_samples);
	307
	308	return ret;
	309	}
	310
	311	static int dev_acquisition_start(const struct sr_dev_inst *sdi)
	312	{
	313	struct sr_dev_driver *di = sdi->driver;
	314	struct sr_datafeed_packet packet;
	315	struct sr_datafeed_meta meta;
	316	struct sr_config *src;
	317	struct dev_context *devc;
	318	struct drv_context *drvc;
	319	struct sr_usb_dev_inst *usb;
	320	struct libusb_transfer xfer_in, xfer_out;
	321	struct timeval tv;
	322	uint64_t interval;
	323	int ret;
	324	unsigned char cmd[3], resp[4], *buf;
	325
	326	if (sdi->status != SR_ST_ACTIVE)
	327	return SR_ERR_DEV_CLOSED;
	328
	329	if (!di->context) {
	330	sr_err("Driver was not initialized.");
	331	return SR_ERR;
	332	}
	333
	334	drvc = di->context;
	335	devc = sdi->priv;
	336	usb = sdi->conn;
	337
	338	if (lascar_proc_config(sdi) != SR_OK)
	339	return SR_ERR;
	340
	341	sr_dbg("Starting log retrieval.");
	342
	343	std_session_send_df_header(sdi, LOG_PREFIX);
	344
	345	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	346	packet.type = SR_DF_META;
	347	packet.payload = &meta;
	348	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
	349	meta.config = g_slist_append(NULL, src);
	350	sr_session_send(sdi, &packet);
	351	g_free(src);
	352
	353	if (devc->logged_samples == 0) {
	354	/* This ensures the frontend knows the session is done. */
	355	std_session_send_df_end(sdi, LOG_PREFIX);
	356	return SR_OK;
	357	}
	358
	359	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	360	!(xfer_out = libusb_alloc_transfer(0)))
	361	return SR_ERR;
	362
	363	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	364	0x00, 0xffff, 0x00, NULL, 0, 50);
	365	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	366	0x02, 0x0002, 0x00, NULL, 0, 50);
	367	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	368	0x02, 0x0001, 0x00, NULL, 0, 50);
	369
	370	/* Flush input. The F321 requires this. */
	371	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
	372	256, &ret, 5) == 0 && ret > 0)
	373	;
	374
	375	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
	376	resp, sizeof(resp), mark_xfer, 0, BULK_XFER_TIMEOUT);
	377	if (libusb_submit_transfer(xfer_in) != 0) {
	378	libusb_free_transfer(xfer_in);
	379	libusb_free_transfer(xfer_out);
	380	return SR_ERR;
	381	}
	382
	383	cmd[0] = 0x03;
	384	cmd[1] = 0xff;
	385	cmd[2] = 0xff;
	386	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
	387	cmd, 3, mark_xfer, 0, 100);
	388	if (libusb_submit_transfer(xfer_out) != 0) {
	389	libusb_free_transfer(xfer_in);
	390	libusb_free_transfer(xfer_out);
	391	return SR_ERR;
	392	}
	393
	394	tv.tv_sec = 0;
	395	tv.tv_usec = 0;
	396	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	397	g_usleep(SLEEP_US_LONG);
	398	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	399	}
	400	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	401	xfer_out->user_data != GINT_TO_POINTER(1)) {
	402	sr_dbg("no response to log transfer request");
	403	libusb_free_transfer(xfer_in);
	404	libusb_free_transfer(xfer_out);
	405	return SR_ERR;
	406	}
	407	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	408	sr_dbg("invalid response to log transfer request");
	409	libusb_free_transfer(xfer_in);
	410	libusb_free_transfer(xfer_out);
	411	return SR_ERR;
	412	}
	413	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	414	libusb_free_transfer(xfer_out);
	415
	416	usb_source_add(sdi->session, drvc->sr_ctx, 100,
	417	lascar_el_usb_handle_events, (void *)sdi);
	418
	419	buf = g_malloc(4096);
	420	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
	421	buf, 4096, lascar_el_usb_receive_transfer,
	422	(struct sr_dev_inst *)sdi, 100);
	423	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	424	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	425	libusb_free_transfer(xfer_in);
	426	g_free(buf);
	427	return SR_ERR;
	428	}
	429
	430	return SR_OK;
	431	}
	432
	433	SR_PRIV int dev_acquisition_stop(struct sr_dev_inst *sdi)
	434	{
	435	struct sr_dev_driver *di = sdi->driver;
	436
	437	if (!di->context) {
	438	sr_err("Driver was not initialized.");
	439	return SR_ERR;
	440	}
	441
	442	if (sdi->status != SR_ST_ACTIVE) {
	443	sr_err("Device inactive, can't stop acquisition.");
	444	return SR_ERR;
	445	}
	446
	447	sdi->status = SR_ST_STOPPING;
	448	/* TODO: free ongoing transfers? */
	449
	450	return SR_OK;
	451	}
	452
	453	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	454	.name = "lascar-el-usb",
	455	.longname = "Lascar EL-USB",
	456	.api_version = 1,
	457	.init = init,
	458	.cleanup = std_cleanup,
	459	.scan = scan,
	460	.dev_list = dev_list,
	461	.dev_clear = NULL,
	462	.config_get = config_get,
	463	.config_set = config_set,
	464	.config_list = config_list,
	465	.dev_open = dev_open,
	466	.dev_close = dev_close,
	467	.dev_acquisition_start = dev_acquisition_start,
	468	.dev_acquisition_stop = dev_acquisition_stop,
	469	.context = NULL,
	470	};