[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 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;

		dev_close(sdi);
		sr_usb_dev_inst_free(sdi->conn);
		sr_dev_inst_free(sdi);
	}

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

	return SR_OK;
}

static int init(struct sr_context *sr_ctx)
{
	return std_hw_init(sr_ctx, di, LOG_PREFIX);
}

static GSList *scan(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->priv;

	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(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	int ret;

	if (!(drvc = di->priv)) {
		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_usb_dev_inst *usb;

	if (!di->priv) {
		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 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;
	struct sr_usb_dev_inst *usb;
	int ret;
	char str[128];

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

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

	if (!di->priv) {
		sr_err("Driver was not initialized.");
		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;
	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 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 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 sr_usb_dev_inst *usb;
	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 (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

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

	drvc = di->priv;
	devc = sdi->priv;
	usb = sdi->conn;
	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, 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(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(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, 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, 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, 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 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 = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = clear_instances,
	.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,
	.priv = NULL,
};
Commit	Line	Data
46697e38 BV	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>
851d5b22	21	#include <libusb.h>
46697e38 BV	22	#include "libsigrok.h"
	23	#include "libsigrok-internal.h"
	24	#include "protocol.h"
	25
851d5b22	26	SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address);
46697e38 BV	27	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
46697e38 BV	28	static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
6078d2c9	29	static int dev_close(struct sr_dev_inst *sdi);
851d5b22	30
7faf69da	31	static const int32_t hwopts[] = {
1953564a	32	SR_CONF_CONN,
851d5b22 BV	33	};
851d5b22 BV	34
7faf69da	35	static const int32_t hwcaps[] = {
1953564a BV	36	SR_CONF_THERMOMETER,
1953564a BV	37	SR_CONF_HYGROMETER,
361d1511	38	SR_CONF_DATALOG,
1953564a	39	SR_CONF_LIMIT_SAMPLES,
851d5b22 BV	40	};
851d5b22 BV	41
46697e38 BV	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
6078d2c9	59	dev_close(sdi);
0f150649	60	sr_usb_dev_inst_free(sdi->conn);
46697e38 BV	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
6078d2c9	70	static int init(struct sr_context *sr_ctx)
46697e38	71	{
29a27196	72	return std_hw_init(sr_ctx, di, LOG_PREFIX);
46697e38 BV	73	}
46697e38 BV	74
6078d2c9	75	static GSList scan(GSList options)
46697e38 BV	76	{
46697e38 BV	77	struct drv_context *drvc;
851d5b22 BV	78	struct sr_dev_inst *sdi;
851d5b22 BV	79	struct sr_usb_dev_inst *usb;
1987b8d6	80	struct sr_config *src;
851d5b22 BV	81	GSList usb_devices, devices, *l;
851d5b22 BV	82	const char *conn;
46697e38	83
4b97c74e	84	drvc = di->priv;
46697e38	85
851d5b22 BV	86	conn = NULL;
851d5b22 BV	87	for (l = options; l; l = l->next) {
1987b8d6 BV	88	src = l->data;
1987b8d6 BV	89	switch (src->key) {
1953564a	90	case SR_CONF_CONN:
7faf69da	91	conn = g_variant_get_string(src->data, NULL);
851d5b22 BV	92	break;
	93	}
	94	}
	95	if (!conn)
	96	return NULL;
	97
	98	devices = NULL;
	99	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	100	/* We have a list of sr_usb_dev_inst matching the connection
	101	* string. Wrap them in sr_dev_inst and we're done. */
	102	for (l = usb_devices; l; l = l->next) {
	103	usb = l->data;
	104	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	105	/* Not a Lascar EL-USB. */
	106	g_free(usb);
	107	continue;
	108	}
0f150649 BV	109	sdi->inst_type = SR_INST_USB;
0f150649 BV	110	sdi->conn = usb;
851d5b22 BV	111	drvc->instances = g_slist_append(drvc->instances, sdi);
	112	devices = g_slist_append(devices, sdi);
	113	}
	114	g_slist_free(usb_devices);
	115	} else
	116	g_slist_free_full(usb_devices, g_free);
46697e38 BV	117
	118	return devices;
	119	}
	120
6078d2c9	121	static GSList *dev_list(void)
46697e38	122	{
0e94d524	123	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	124	}
46697e38 BV	125
6078d2c9	126	static int dev_open(struct sr_dev_inst *sdi)
46697e38	127	{
6aa1eb4e	128	struct drv_context *drvc;
0f150649	129	struct sr_usb_dev_inst *usb;
6aa1eb4e	130	int ret;
46697e38	131
6aa1eb4e BV	132	if (!(drvc = di->priv)) {
	133	sr_err("Driver was not initialized.");
	134	return SR_ERR;
	135	}
	136
0f150649 BV	137	usb = sdi->conn;
	138
	139	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
6aa1eb4e BV	140	return SR_ERR;
6aa1eb4e BV	141
0f150649	142	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
6aa1eb4e BV	143	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	144	return SR_ERR;
	145	}
	146	sdi->status = SR_ST_ACTIVE;
	147
	148	return ret;
46697e38 BV	149	}
46697e38 BV	150
6078d2c9	151	static int dev_close(struct sr_dev_inst *sdi)
46697e38	152	{
0f150649	153	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	154
	155	if (!di->priv) {
	156	sr_err("Driver was not initialized.");
	157	return SR_ERR;
	158	}
	159
0f150649 BV	160	usb = sdi->conn;
	161
	162	if (!usb->devhdl)
6aa1eb4e BV	163	/* Nothing to do. */
	164	return SR_OK;
	165
0f150649 BV	166	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	167	libusb_close(usb->devhdl);
	168	usb->devhdl = NULL;
6aa1eb4e BV	169	sdi->status = SR_ST_INACTIVE;
6aa1eb4e BV	170
46697e38 BV	171	return SR_OK;
	172	}
	173
6078d2c9	174	static int cleanup(void)
46697e38	175	{
6aa1eb4e	176	struct drv_context *drvc;
46697e38	177
6aa1eb4e BV	178	if (!(drvc = di->priv))
	179	/* Can get called on an unused driver, doesn't matter. */
	180	return SR_OK;
	181
	182	clear_instances();
	183	g_free(drvc);
	184	di->priv = NULL;
46697e38 BV	185
	186	return SR_OK;
	187	}
	188
7faf69da	189	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
361d1511 BV	190	{
361d1511 BV	191	struct dev_context *devc;
0f150649	192	struct sr_usb_dev_inst *usb;
361d1511	193	int ret;
0f150649	194	char str[128];
361d1511 BV	195
	196	devc = sdi->priv;
	197	switch (id) {
0f150649 BV	198	case SR_CONF_CONN:
	199	if (!sdi \|\| !sdi->conn)
	200	return SR_ERR_ARG;
	201	usb = sdi->conn;
	202	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	203	*data = g_variant_new_string(str);
	204	break;
361d1511 BV	205	case SR_CONF_DATALOG:
	206	if (!sdi)
	207	return SR_ERR_ARG;
	208	if ((ret = lascar_is_logging(sdi)) == -1)
	209	return SR_ERR;
7faf69da	210	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
361d1511 BV	211	break;
361d1511 BV	212	case SR_CONF_LIMIT_SAMPLES:
7faf69da	213	*data = g_variant_new_uint64(devc->limit_samples);
361d1511 BV	214	break;
361d1511 BV	215	default:
bd6fbf62	216	return SR_ERR_NA;
361d1511 BV	217	}
	218
	219	return SR_OK;
	220	}
	221
7faf69da	222	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
46697e38	223	{
6aa1eb4e	224	struct dev_context *devc;
46697e38 BV	225	int ret;
46697e38 BV	226
e73ffd42 BV	227	if (sdi->status != SR_ST_ACTIVE)
	228	return SR_ERR_DEV_CLOSED;
	229
6aa1eb4e BV	230	if (!di->priv) {
	231	sr_err("Driver was not initialized.");
	232	return SR_ERR;
	233	}
46697e38	234
6aa1eb4e	235	devc = sdi->priv;
46697e38	236	ret = SR_OK;
035a1078	237	switch (id) {
361d1511	238	case SR_CONF_DATALOG:
7faf69da	239	if (g_variant_get_boolean(data)) {
361d1511 BV	240	/* Start logging. */
	241	ret = lascar_start_logging(sdi);
	242	} else {
	243	/* Stop logging. */
	244	ret = lascar_stop_logging(sdi);
	245	}
	246	break;
1953564a	247	case SR_CONF_LIMIT_SAMPLES:
7faf69da	248	devc->limit_samples = g_variant_get_uint64(data);
6aa1eb4e BV	249	sr_dbg("Setting sample limit to %" PRIu64 ".",
	250	devc->limit_samples);
	251	break;
46697e38	252	default:
bd6fbf62	253	ret = SR_ERR_NA;
46697e38 BV	254	}
	255
	256	return ret;
	257	}
	258
7faf69da	259	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
a1c743fc BV	260	{
	261
	262	(void)sdi;
	263
	264	switch (key) {
0d485e30	265	case SR_CONF_SCAN_OPTIONS:
7faf69da BV	266	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	267	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
0d485e30	268	break;
9a6517d1	269	case SR_CONF_DEVICE_OPTIONS:
7faf69da BV	270	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	271	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	272	break;
a1c743fc	273	default:
bd6fbf62	274	return SR_ERR_NA;
a1c743fc BV	275	}
	276
	277	return SR_OK;
	278	}
	279
6aa1eb4e BV	280	static void mark_xfer(struct libusb_transfer *xfer)
	281	{
	282
	283	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	284	xfer->user_data = GINT_TO_POINTER(1);
	285	else
	286	xfer->user_data = GINT_TO_POINTER(-1);
	287
	288	}
	289
	290	/* The Lascar software, in its infinite ignorance, reads a set of four
	291	* bytes from the device config struct and interprets it as a float.
	292	* That only works because they only use windows, and only on x86. However
	293	* we may be running on any architecture, any operating system. So we have
	294	* to convert these four bytes as the Lascar software would on windows/x86,
	295	* to the local representation of a float.
	296	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	297	static float binary32_le_to_float(unsigned char *buf)
	298	{
	299	GFloatIEEE754 f;
	300
	301	f.v_float = 0;
	302	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	303	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	304	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	305
	306	return f.v_float;
	307	}
	308
	309	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	310	{
	311	struct dev_context *devc;
0f150649	312	struct sr_usb_dev_inst *usb;
361d1511	313	int dummy, ret;
6aa1eb4e BV	314
6aa1eb4e BV	315	devc = sdi->priv;
0f150649 BV	316	usb = sdi->conn;
	317
	318	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
6aa1eb4e BV	319	return SR_ERR;
	320
	321	ret = SR_OK;
	322	switch (devc->profile->logformat) {
	323	case LOG_TEMP_RH:
6787f404 BV	324	devc->sample_size = 2;
	325	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	326	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	327	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	328	/* Default to Celcius, we're all adults here. */
	329	devc->temp_unit = 0;
	330	} else
	331	sr_dbg("temperature unit is %s", devc->temp_unit
	332	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	333	break;
	334	case LOG_CO:
	335	devc->sample_size = 2;
6787f404 BV	336	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	337	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	338	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	339	devc->co_low);
	340	break;
	341	default:
	342	ret = SR_ERR_ARG;
	343	}
	344	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	345	sr_dbg("device log contains %d samples.", devc->logged_samples);
	346
	347	return ret;
	348	}
	349
6078d2c9	350	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
46697e38	351	{
6aa1eb4e	352	struct sr_datafeed_packet packet;
8e77bc20 BV	353	struct sr_datafeed_meta meta;
8e77bc20 BV	354	struct sr_config *src;
6aa1eb4e	355	struct dev_context *devc;
8e77bc20	356	struct drv_context *drvc;
0f150649	357	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	358	struct libusb_transfer xfer_in, xfer_out;
	359	const struct libusb_pollfd **pfd;
	360	struct timeval tv;
8e77bc20	361	uint64_t interval;
6aa1eb4e BV	362	int ret, i;
	363	unsigned char cmd[3], resp[4], *buf;
	364
e73ffd42 BV	365	if (sdi->status != SR_ST_ACTIVE)
	366	return SR_ERR_DEV_CLOSED;
	367
6aa1eb4e BV	368	if (!di->priv) {
	369	sr_err("Driver was not initialized.");
	370	return SR_ERR;
	371	}
	372
8e77bc20	373	drvc = di->priv;
6aa1eb4e	374	devc = sdi->priv;
0f150649	375	usb = sdi->conn;
6aa1eb4e BV	376	devc->cb_data = cb_data;
	377
	378	if (lascar_proc_config(sdi) != SR_OK)
	379	return SR_ERR;
	380
	381	sr_dbg("Starting log retrieval.");
	382
	383	/* Send header packet to the session bus. */
29a27196	384	std_session_send_df_header(cb_data, LOG_PREFIX);
6aa1eb4e	385
8e77bc20 BV	386	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	387	packet.type = SR_DF_META;
	388	packet.payload = &meta;
7faf69da	389	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
8e77bc20 BV	390	meta.config = g_slist_append(NULL, src);
	391	sr_session_send(devc->cb_data, &packet);
	392	g_free(src);
	393
6aa1eb4e BV	394	if (devc->logged_samples == 0) {
	395	/* This ensures the frontend knows the session is done. */
	396	packet.type = SR_DF_END;
	397	sr_session_send(devc->cb_data, &packet);
	398	return SR_OK;
	399	}
	400
	401	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	402	!(xfer_out = libusb_alloc_transfer(0)))
	403	return SR_ERR;
	404
0f150649	405	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	406	0x00, 0xffff, 0x00, NULL, 0, 50);
0f150649	407	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	408	0x02, 0x0002, 0x00, NULL, 0, 50);
0f150649	409	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e BV	410	0x02, 0x0001, 0x00, NULL, 0, 50);
	411
	412
	413	/* Flush input. The F321 requires this. */
0f150649	414	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
6aa1eb4e BV	415	256, &ret, 5) == 0 && ret > 0)
	416	;
	417
0f150649	418	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	419	resp, sizeof(resp), mark_xfer, 0, 10000);
	420	if (libusb_submit_transfer(xfer_in) != 0) {
	421	libusb_free_transfer(xfer_in);
	422	libusb_free_transfer(xfer_out);
	423	return SR_ERR;
	424	}
	425
	426	cmd[0] = 0x03;
	427	cmd[1] = 0xff;
	428	cmd[2] = 0xff;
0f150649	429	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
6aa1eb4e BV	430	cmd, 3, mark_xfer, 0, 100);
	431	if (libusb_submit_transfer(xfer_out) != 0) {
	432	libusb_free_transfer(xfer_in);
	433	libusb_free_transfer(xfer_out);
	434	return SR_ERR;
	435	}
	436
	437	tv.tv_sec = 0;
	438	tv.tv_usec = 0;
	439	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	440	g_usleep(5000);
	441	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	442	}
	443	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	444	xfer_in->user_data != GINT_TO_POINTER(1)) {
	445	sr_dbg("no response to log transfer request");
	446	libusb_free_transfer(xfer_in);
	447	libusb_free_transfer(xfer_out);
	448	return SR_ERR;
	449	}
	450	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	451	sr_dbg("invalid response to log transfer request");
	452	libusb_free_transfer(xfer_in);
	453	libusb_free_transfer(xfer_out);
	454	return SR_ERR;
	455	}
	456	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	457	libusb_free_transfer(xfer_out);
	458
6aa1eb4e BV	459	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	460	for (i = 0; pfd[i]; i++) {
	461	/* Handle USB events every 100ms, for decent latency. */
	462	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	463	lascar_el_usb_handle_events, (void *)sdi);
	464	/* We'll need to remove this fd later. */
	465	devc->usbfd[i] = pfd[i]->fd;
	466	}
	467	devc->usbfd[i] = -1;
	468
	469	buf = g_try_malloc(4096);
0f150649	470	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	471	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	472	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	473	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	474	libusb_free_transfer(xfer_in);
	475	g_free(buf);
	476	return SR_ERR;
	477	}
46697e38 BV	478
	479	return SR_OK;
	480	}
	481
6078d2c9	482	SR_PRIV int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	483	{
	484	(void)cb_data;
	485
6aa1eb4e BV	486	if (!di->priv) {
	487	sr_err("Driver was not initialized.");
	488	return SR_ERR;
	489	}
	490
46697e38 BV	491	if (sdi->status != SR_ST_ACTIVE) {
	492	sr_err("Device inactive, can't stop acquisition.");
	493	return SR_ERR;
	494	}
	495
6aa1eb4e BV	496	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	497	/* TODO: free ongoing transfers? */
46697e38 BV	498
	499	return SR_OK;
	500	}
	501
	502	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	503	.name = "lascar-el-usb",
	504	.longname = "Lascar EL-USB",
	505	.api_version = 1,
6078d2c9 UH	506	.init = init,
	507	.cleanup = cleanup,
	508	.scan = scan,
	509	.dev_list = dev_list,
46697e38	510	.dev_clear = clear_instances,
361d1511	511	.config_get = config_get,
035a1078	512	.config_set = config_set,
a1c743fc	513	.config_list = config_list,
6078d2c9 UH	514	.dev_open = dev_open,
	515	.dev_close = dev_close,
	516	.dev_acquisition_start = dev_acquisition_start,
	517	.dev_acquisition_stop = dev_acquisition_stop,
46697e38 BV	518	.priv = NULL,
46697e38 BV	519	};