[libsigrok.git] / 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 <glib.h>
#include <libusb.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address);
SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
static int hw_dev_close(struct sr_dev_inst *sdi);

static const int32_t hwopts[] = {
	SR_CONF_CONN,
};

static const int32_t hwcaps[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_HYGROMETER,
	SR_CONF_DATALOG,
	SR_CONF_LIMIT_SAMPLES,
};

/* Properly close and free all devices. */
static int clear_instances(void)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	GSList *l;

	if (!(drvc = di->priv))
		return SR_OK;

	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data))
			continue;
		if (!(devc = sdi->priv))
			continue;

		hw_dev_close(sdi);
		sr_usb_dev_inst_free(devc->usb);
		sr_dev_inst_free(sdi);
	}

	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

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

	(void)options;

	drvc = di->priv;

	/* USB scan is always authoritative. */
	clear_instances();

	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;
			}
			devc = sdi->priv;
			devc->usb = 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 *hw_dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	int ret;

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

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

	if ((ret = libusb_claim_interface(devc->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 hw_dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

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

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


	return SR_OK;
}

static int hw_cleanup(void)
{
	struct drv_context *drvc;

	if (!(drvc = di->priv))
		/* Can get called on an unused driver, doesn't matter. */
		return SR_OK;

	clear_instances();
	g_free(drvc);
	di->priv = NULL;

	return SR_OK;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	devc = sdi->priv;
	switch (id) {
	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(int id, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	if (!di->priv) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}
	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't set config options.");
		return SR_ERR;
	}

	devc = sdi->priv;
	ret = SR_OK;
	switch (id) {
	case SR_CONF_DATALOG:
		if (g_variant_get_boolean(data)) {
			/* Start logging. */
			ret = lascar_start_logging(sdi);
		} else {
			/* Stop logging. */
			ret = lascar_stop_logging(sdi);
		}
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void 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;
	int dummy, ret;

	devc = sdi->priv;
	if (lascar_get_config(devc->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 Celcius, we're all adults here. */
			devc->temp_unit = 0;
		} else
			sr_dbg("temperature unit is %s", devc->temp_unit
					? "Fahrenheit" : "Celcius");
		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 hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_config *src;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct libusb_transfer *xfer_in, *xfer_out;
	const struct libusb_pollfd **pfd;
	struct timeval tv;
	uint64_t interval;
	int ret, i;
	unsigned char cmd[3], resp[4], *buf;

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

	drvc = di->priv;
	devc = sdi->priv;
	devc->cb_data = cb_data;

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

	sr_dbg("Starting log retrieval.");

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);

	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(devc->cb_data, &packet);
	g_free(src);

	if (devc->logged_samples == 0) {
		/* This ensures the frontend knows the session is done. */
		packet.type = SR_DF_END;
		sr_session_send(devc->cb_data, &packet);
		return SR_OK;
	}

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

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


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

	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
			resp, sizeof(resp), mark_xfer, 0, 10000);
	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, devc->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(5000);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}
	if (xfer_in->user_data != GINT_TO_POINTER(1) ||
			xfer_in->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);

	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	for (i = 0; pfd[i]; i++) {
		/* Handle USB events every 100ms, for decent latency. */
		sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
				lascar_el_usb_handle_events, (void *)sdi);
		/* We'll need to remove this fd later. */
		devc->usbfd[i] = pfd[i]->fd;
	}
	devc->usbfd[i] = -1;

	buf = g_try_malloc(4096);
	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
			buf, 4096, lascar_el_usb_receive_transfer, cb_data, 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 hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	(void)cb_data;

	if (!di->priv) {
		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 = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = 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 <glib.h>
	21	#include <libusb.h>
	22	#include "libsigrok.h"
	23	#include "libsigrok-internal.h"
	24	#include "protocol.h"
	25
	26	SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address);
	27	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
	28	static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
	29	static int hw_dev_close(struct sr_dev_inst *sdi);
	30
	31	static const int32_t hwopts[] = {
	32	SR_CONF_CONN,
	33	};
	34
	35	static const int32_t hwcaps[] = {
	36	SR_CONF_THERMOMETER,
	37	SR_CONF_HYGROMETER,
	38	SR_CONF_DATALOG,
	39	SR_CONF_LIMIT_SAMPLES,
	40	};
	41
	42	/* Properly close and free all devices. */
	43	static int clear_instances(void)
	44	{
	45	struct sr_dev_inst *sdi;
	46	struct drv_context *drvc;
	47	struct dev_context *devc;
	48	GSList *l;
	49
	50	if (!(drvc = di->priv))
	51	return SR_OK;
	52
	53	for (l = drvc->instances; l; l = l->next) {
	54	if (!(sdi = l->data))
	55	continue;
	56	if (!(devc = sdi->priv))
	57	continue;
	58
	59	hw_dev_close(sdi);
	60	sr_usb_dev_inst_free(devc->usb);
	61	sr_dev_inst_free(sdi);
	62	}
	63
	64	g_slist_free(drvc->instances);
	65	drvc->instances = NULL;
	66
	67	return SR_OK;
	68	}
	69
	70	static int hw_init(struct sr_context *sr_ctx)
	71	{
	72	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
	73	}
	74
	75	static GSList hw_scan(GSList options)
	76	{
	77	struct drv_context *drvc;
	78	struct dev_context *devc;
	79	struct sr_dev_inst *sdi;
	80	struct sr_usb_dev_inst *usb;
	81	struct sr_config *src;
	82	GSList usb_devices, devices, *l;
	83	const char *conn;
	84
	85	(void)options;
	86
	87	drvc = di->priv;
	88
	89	/* USB scan is always authoritative. */
	90	clear_instances();
	91
	92	conn = NULL;
	93	for (l = options; l; l = l->next) {
	94	src = l->data;
	95	switch (src->key) {
	96	case SR_CONF_CONN:
	97	conn = g_variant_get_string(src->data, NULL);
	98	break;
	99	}
	100	}
	101	if (!conn)
	102	return NULL;
	103
	104	devices = NULL;
	105	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	106	/* We have a list of sr_usb_dev_inst matching the connection
	107	* string. Wrap them in sr_dev_inst and we're done. */
	108	for (l = usb_devices; l; l = l->next) {
	109	usb = l->data;
	110	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	111	/* Not a Lascar EL-USB. */
	112	g_free(usb);
	113	continue;
	114	}
	115	devc = sdi->priv;
	116	devc->usb = usb;
	117	drvc->instances = g_slist_append(drvc->instances, sdi);
	118	devices = g_slist_append(devices, sdi);
	119	}
	120	g_slist_free(usb_devices);
	121	} else
	122	g_slist_free_full(usb_devices, g_free);
	123
	124	return devices;
	125	}
	126
	127	static GSList *hw_dev_list(void)
	128	{
	129	return ((struct drv_context *)(di->priv))->instances;
	130	}
	131
	132	static int hw_dev_open(struct sr_dev_inst *sdi)
	133	{
	134	struct drv_context *drvc;
	135	struct dev_context *devc;
	136	int ret;
	137
	138	if (!(drvc = di->priv)) {
	139	sr_err("Driver was not initialized.");
	140	return SR_ERR;
	141	}
	142
	143	devc = sdi->priv;
	144	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	145	return SR_ERR;
	146
	147	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	148	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	149	return SR_ERR;
	150	}
	151	sdi->status = SR_ST_ACTIVE;
	152
	153	return ret;
	154	}
	155
	156	static int hw_dev_close(struct sr_dev_inst *sdi)
	157	{
	158	struct dev_context *devc;
	159
	160	if (!di->priv) {
	161	sr_err("Driver was not initialized.");
	162	return SR_ERR;
	163	}
	164
	165	devc = sdi->priv;
	166	if (!devc->usb->devhdl)
	167	/* Nothing to do. */
	168	return SR_OK;
	169
	170	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	171	libusb_close(devc->usb->devhdl);
	172	devc->usb->devhdl = NULL;
	173	sdi->status = SR_ST_INACTIVE;
	174
	175
	176	return SR_OK;
	177	}
	178
	179	static int hw_cleanup(void)
	180	{
	181	struct drv_context *drvc;
	182
	183	if (!(drvc = di->priv))
	184	/* Can get called on an unused driver, doesn't matter. */
	185	return SR_OK;
	186
	187	clear_instances();
	188	g_free(drvc);
	189	di->priv = NULL;
	190
	191	return SR_OK;
	192	}
	193
	194	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
	195	{
	196	struct dev_context *devc;
	197	int ret;
	198
	199	devc = sdi->priv;
	200	switch (id) {
	201	case SR_CONF_DATALOG:
	202	if (!sdi)
	203	return SR_ERR_ARG;
	204	if ((ret = lascar_is_logging(sdi)) == -1)
	205	return SR_ERR;
	206	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
	207	break;
	208	case SR_CONF_LIMIT_SAMPLES:
	209	*data = g_variant_new_uint64(devc->limit_samples);
	210	break;
	211	default:
	212	return SR_ERR_NA;
	213	}
	214
	215	return SR_OK;
	216	}
	217
	218	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
	219	{
	220	struct dev_context *devc;
	221	int ret;
	222
	223	if (!di->priv) {
	224	sr_err("Driver was not initialized.");
	225	return SR_ERR;
	226	}
	227	if (sdi->status != SR_ST_ACTIVE) {
	228	sr_err("Device inactive, can't set config options.");
	229	return SR_ERR;
	230	}
	231
	232	devc = sdi->priv;
	233	ret = SR_OK;
	234	switch (id) {
	235	case SR_CONF_DATALOG:
	236	if (g_variant_get_boolean(data)) {
	237	/* Start logging. */
	238	ret = lascar_start_logging(sdi);
	239	} else {
	240	/* Stop logging. */
	241	ret = lascar_stop_logging(sdi);
	242	}
	243	break;
	244	case SR_CONF_LIMIT_SAMPLES:
	245	devc->limit_samples = g_variant_get_uint64(data);
	246	sr_dbg("Setting sample limit to %" PRIu64 ".",
	247	devc->limit_samples);
	248	break;
	249	default:
	250	ret = SR_ERR_NA;
	251	}
	252
	253	return ret;
	254	}
	255
	256	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	257	{
	258
	259	(void)sdi;
	260
	261	switch (key) {
	262	case SR_CONF_SCAN_OPTIONS:
	263	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	264	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
	265	break;
	266	case SR_CONF_DEVICE_OPTIONS:
	267	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	268	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	269	break;
	270	default:
	271	return SR_ERR_NA;
	272	}
	273
	274	return SR_OK;
	275	}
	276
	277	static void mark_xfer(struct libusb_transfer *xfer)
	278	{
	279
	280	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	281	xfer->user_data = GINT_TO_POINTER(1);
	282	else
	283	xfer->user_data = GINT_TO_POINTER(-1);
	284
	285	}
	286
	287	/* The Lascar software, in its infinite ignorance, reads a set of four
	288	* bytes from the device config struct and interprets it as a float.
	289	* That only works because they only use windows, and only on x86. However
	290	* we may be running on any architecture, any operating system. So we have
	291	* to convert these four bytes as the Lascar software would on windows/x86,
	292	* to the local representation of a float.
	293	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	294	static float binary32_le_to_float(unsigned char *buf)
	295	{
	296	GFloatIEEE754 f;
	297
	298	f.v_float = 0;
	299	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	300	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	301	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	302
	303	return f.v_float;
	304	}
	305
	306	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	307	{
	308	struct dev_context *devc;
	309	int dummy, ret;
	310
	311	devc = sdi->priv;
	312	if (lascar_get_config(devc->usb->devhdl, devc->config, &dummy) != SR_OK)
	313	return SR_ERR;
	314
	315	ret = SR_OK;
	316	switch (devc->profile->logformat) {
	317	case LOG_TEMP_RH:
	318	devc->sample_size = 2;
	319	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	320	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	321	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	322	/* Default to Celcius, we're all adults here. */
	323	devc->temp_unit = 0;
	324	} else
	325	sr_dbg("temperature unit is %s", devc->temp_unit
	326	? "Fahrenheit" : "Celcius");
	327	break;
	328	case LOG_CO:
	329	devc->sample_size = 2;
	330	devc->co_high = binary32_le_to_float(devc->config + 0x24);
	331	devc->co_low = binary32_le_to_float(devc->config + 0x28);
	332	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	333	devc->co_low);
	334	break;
	335	default:
	336	ret = SR_ERR_ARG;
	337	}
	338	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	339	sr_dbg("device log contains %d samples.", devc->logged_samples);
	340
	341	return ret;
	342	}
	343
	344	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	345	void *cb_data)
	346	{
	347	struct sr_datafeed_packet packet;
	348	struct sr_datafeed_meta meta;
	349	struct sr_config *src;
	350	struct dev_context *devc;
	351	struct drv_context *drvc;
	352	struct libusb_transfer xfer_in, xfer_out;
	353	const struct libusb_pollfd **pfd;
	354	struct timeval tv;
	355	uint64_t interval;
	356	int ret, i;
	357	unsigned char cmd[3], resp[4], *buf;
	358
	359	if (!di->priv) {
	360	sr_err("Driver was not initialized.");
	361	return SR_ERR;
	362	}
	363
	364	drvc = di->priv;
	365	devc = sdi->priv;
	366	devc->cb_data = cb_data;
	367
	368	if (lascar_proc_config(sdi) != SR_OK)
	369	return SR_ERR;
	370
	371	sr_dbg("Starting log retrieval.");
	372
	373	/* Send header packet to the session bus. */
	374	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
	375
	376	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	377	packet.type = SR_DF_META;
	378	packet.payload = &meta;
	379	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
	380	meta.config = g_slist_append(NULL, src);
	381	sr_session_send(devc->cb_data, &packet);
	382	g_free(src);
	383
	384	if (devc->logged_samples == 0) {
	385	/* This ensures the frontend knows the session is done. */
	386	packet.type = SR_DF_END;
	387	sr_session_send(devc->cb_data, &packet);
	388	return SR_OK;
	389	}
	390
	391	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	392	!(xfer_out = libusb_alloc_transfer(0)))
	393	return SR_ERR;
	394
	395	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	396	0x00, 0xffff, 0x00, NULL, 0, 50);
	397	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	398	0x02, 0x0002, 0x00, NULL, 0, 50);
	399	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	400	0x02, 0x0001, 0x00, NULL, 0, 50);
	401
	402
	403	/* Flush input. The F321 requires this. */
	404	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	405	256, &ret, 5) == 0 && ret > 0)
	406	;
	407
	408	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	409	resp, sizeof(resp), mark_xfer, 0, 10000);
	410	if (libusb_submit_transfer(xfer_in) != 0) {
	411	libusb_free_transfer(xfer_in);
	412	libusb_free_transfer(xfer_out);
	413	return SR_ERR;
	414	}
	415
	416	cmd[0] = 0x03;
	417	cmd[1] = 0xff;
	418	cmd[2] = 0xff;
	419	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
	420	cmd, 3, mark_xfer, 0, 100);
	421	if (libusb_submit_transfer(xfer_out) != 0) {
	422	libusb_free_transfer(xfer_in);
	423	libusb_free_transfer(xfer_out);
	424	return SR_ERR;
	425	}
	426
	427	tv.tv_sec = 0;
	428	tv.tv_usec = 0;
	429	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	430	g_usleep(5000);
	431	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	432	}
	433	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	434	xfer_in->user_data != GINT_TO_POINTER(1)) {
	435	sr_dbg("no response to log transfer request");
	436	libusb_free_transfer(xfer_in);
	437	libusb_free_transfer(xfer_out);
	438	return SR_ERR;
	439	}
	440	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	441	sr_dbg("invalid response to log transfer request");
	442	libusb_free_transfer(xfer_in);
	443	libusb_free_transfer(xfer_out);
	444	return SR_ERR;
	445	}
	446	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	447	libusb_free_transfer(xfer_out);
	448
	449	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	450	for (i = 0; pfd[i]; i++) {
	451	/* Handle USB events every 100ms, for decent latency. */
	452	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	453	lascar_el_usb_handle_events, (void *)sdi);
	454	/* We'll need to remove this fd later. */
	455	devc->usbfd[i] = pfd[i]->fd;
	456	}
	457	devc->usbfd[i] = -1;
	458
	459	buf = g_try_malloc(4096);
	460	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	461	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	462	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	463	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	464	libusb_free_transfer(xfer_in);
	465	g_free(buf);
	466	return SR_ERR;
	467	}
	468
	469	return SR_OK;
	470	}
	471
	472	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	473	{
	474	(void)cb_data;
	475
	476	if (!di->priv) {
	477	sr_err("Driver was not initialized.");
	478	return SR_ERR;
	479	}
	480
	481	if (sdi->status != SR_ST_ACTIVE) {
	482	sr_err("Device inactive, can't stop acquisition.");
	483	return SR_ERR;
	484	}
	485
	486	sdi->status = SR_ST_STOPPING;
	487	/* TODO: free ongoing transfers? */
	488
	489	return SR_OK;
	490	}
	491
	492	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	493	.name = "lascar-el-usb",
	494	.longname = "Lascar EL-USB",
	495	.api_version = 1,
	496	.init = hw_init,
	497	.cleanup = hw_cleanup,
	498	.scan = hw_scan,
	499	.dev_list = hw_dev_list,
	500	.dev_clear = clear_instances,
	501	.config_get = config_get,
	502	.config_set = config_set,
	503	.config_list = config_list,
	504	.dev_open = hw_dev_open,
	505	.dev_close = hw_dev_close,
	506	.dev_acquisition_start = hw_dev_acquisition_start,
	507	.dev_acquisition_stop = hw_dev_acquisition_stop,
	508	.priv = NULL,
	509	};