[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_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;

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,
};

static int dev_clear(void)
{
	return std_dev_clear(di, NULL);
}

static int init(struct sr_context *sr_ctx)
{
	return std_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)
{
	int ret;
	struct drv_context *drvc;

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

	ret = dev_clear();
	g_free(drvc);
	di->priv = NULL;

	return ret;
}

static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_probe_group *probe_group)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int ret;
	char str[128];

	(void)probe_group;

	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,
		const struct sr_probe_group *probe_group)
{
	struct dev_context *devc;
	int ret;

	(void)probe_group;

	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,
		const struct sr_probe_group *probe_group)
{
	(void)sdi;
	(void)probe_group;

	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;
	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->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);

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

	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 = dev_clear,
	.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
	26	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
	27	static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
851d5b22	28
7faf69da	29	static const int32_t hwopts[] = {
1953564a	30	SR_CONF_CONN,
851d5b22 BV	31	};
851d5b22 BV	32
7faf69da	33	static const int32_t hwcaps[] = {
1953564a BV	34	SR_CONF_THERMOMETER,
1953564a BV	35	SR_CONF_HYGROMETER,
361d1511	36	SR_CONF_DATALOG,
1953564a	37	SR_CONF_LIMIT_SAMPLES,
851d5b22 BV	38	};
851d5b22 BV	39
3b412e3a	40	static int dev_clear(void)
46697e38	41	{
c9d622a4	42	return std_dev_clear(di, NULL);
46697e38 BV	43	}
46697e38 BV	44
6078d2c9	45	static int init(struct sr_context *sr_ctx)
46697e38	46	{
f6beaac5	47	return std_init(sr_ctx, di, LOG_PREFIX);
46697e38 BV	48	}
46697e38 BV	49
6078d2c9	50	static GSList scan(GSList options)
46697e38 BV	51	{
46697e38 BV	52	struct drv_context *drvc;
851d5b22 BV	53	struct sr_dev_inst *sdi;
851d5b22 BV	54	struct sr_usb_dev_inst *usb;
1987b8d6	55	struct sr_config *src;
851d5b22 BV	56	GSList usb_devices, devices, *l;
851d5b22 BV	57	const char *conn;
46697e38	58
4b97c74e	59	drvc = di->priv;
46697e38	60
851d5b22 BV	61	conn = NULL;
851d5b22 BV	62	for (l = options; l; l = l->next) {
1987b8d6 BV	63	src = l->data;
1987b8d6 BV	64	switch (src->key) {
1953564a	65	case SR_CONF_CONN:
7faf69da	66	conn = g_variant_get_string(src->data, NULL);
851d5b22 BV	67	break;
	68	}
	69	}
	70	if (!conn)
	71	return NULL;
	72
	73	devices = NULL;
	74	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	75	/* We have a list of sr_usb_dev_inst matching the connection
	76	* string. Wrap them in sr_dev_inst and we're done. */
	77	for (l = usb_devices; l; l = l->next) {
	78	usb = l->data;
	79	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	80	/* Not a Lascar EL-USB. */
	81	g_free(usb);
	82	continue;
	83	}
0f150649 BV	84	sdi->inst_type = SR_INST_USB;
0f150649 BV	85	sdi->conn = usb;
851d5b22 BV	86	drvc->instances = g_slist_append(drvc->instances, sdi);
	87	devices = g_slist_append(devices, sdi);
	88	}
	89	g_slist_free(usb_devices);
	90	} else
	91	g_slist_free_full(usb_devices, g_free);
46697e38 BV	92
	93	return devices;
	94	}
	95
6078d2c9	96	static GSList *dev_list(void)
46697e38	97	{
0e94d524	98	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	99	}
46697e38 BV	100
6078d2c9	101	static int dev_open(struct sr_dev_inst *sdi)
46697e38	102	{
6aa1eb4e	103	struct drv_context *drvc;
0f150649	104	struct sr_usb_dev_inst *usb;
6aa1eb4e	105	int ret;
46697e38	106
6aa1eb4e BV	107	if (!(drvc = di->priv)) {
	108	sr_err("Driver was not initialized.");
	109	return SR_ERR;
	110	}
	111
0f150649 BV	112	usb = sdi->conn;
	113
	114	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
6aa1eb4e BV	115	return SR_ERR;
6aa1eb4e BV	116
0f150649	117	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
6aa1eb4e BV	118	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	119	return SR_ERR;
	120	}
	121	sdi->status = SR_ST_ACTIVE;
	122
	123	return ret;
46697e38 BV	124	}
46697e38 BV	125
6078d2c9	126	static int dev_close(struct sr_dev_inst *sdi)
46697e38	127	{
0f150649	128	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	129
	130	if (!di->priv) {
	131	sr_err("Driver was not initialized.");
	132	return SR_ERR;
	133	}
	134
0f150649 BV	135	usb = sdi->conn;
	136
	137	if (!usb->devhdl)
6aa1eb4e BV	138	/* Nothing to do. */
	139	return SR_OK;
	140
0f150649 BV	141	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	142	libusb_close(usb->devhdl);
	143	usb->devhdl = NULL;
6aa1eb4e BV	144	sdi->status = SR_ST_INACTIVE;
6aa1eb4e BV	145
46697e38 BV	146	return SR_OK;
	147	}
	148
6078d2c9	149	static int cleanup(void)
46697e38	150	{
c9d622a4	151	int ret;
6aa1eb4e	152	struct drv_context *drvc;
46697e38	153
6aa1eb4e BV	154	if (!(drvc = di->priv))
	155	/* Can get called on an unused driver, doesn't matter. */
	156	return SR_OK;
	157
3b412e3a	158	ret = dev_clear();
6aa1eb4e BV	159	g_free(drvc);
6aa1eb4e BV	160	di->priv = NULL;
46697e38	161
c9d622a4	162	return ret;
46697e38 BV	163	}
46697e38 BV	164
8f996b89 ML	165	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi,
8f996b89 ML	166	const struct sr_probe_group *probe_group)
361d1511 BV	167	{
361d1511 BV	168	struct dev_context *devc;
0f150649	169	struct sr_usb_dev_inst *usb;
361d1511	170	int ret;
0f150649	171	char str[128];
361d1511	172
8f996b89 ML	173	(void)probe_group;
8f996b89 ML	174
361d1511 BV	175	devc = sdi->priv;
361d1511 BV	176	switch (id) {
0f150649 BV	177	case SR_CONF_CONN:
	178	if (!sdi \|\| !sdi->conn)
	179	return SR_ERR_ARG;
	180	usb = sdi->conn;
	181	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	182	*data = g_variant_new_string(str);
	183	break;
361d1511 BV	184	case SR_CONF_DATALOG:
	185	if (!sdi)
	186	return SR_ERR_ARG;
	187	if ((ret = lascar_is_logging(sdi)) == -1)
	188	return SR_ERR;
7faf69da	189	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
361d1511 BV	190	break;
361d1511 BV	191	case SR_CONF_LIMIT_SAMPLES:
7faf69da	192	*data = g_variant_new_uint64(devc->limit_samples);
361d1511 BV	193	break;
361d1511 BV	194	default:
bd6fbf62	195	return SR_ERR_NA;
361d1511 BV	196	}
	197
	198	return SR_OK;
	199	}
	200
8f996b89 ML	201	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi,
8f996b89 ML	202	const struct sr_probe_group *probe_group)
46697e38	203	{
6aa1eb4e	204	struct dev_context *devc;
46697e38 BV	205	int ret;
46697e38 BV	206
8f996b89 ML	207	(void)probe_group;
8f996b89 ML	208
e73ffd42 BV	209	if (sdi->status != SR_ST_ACTIVE)
	210	return SR_ERR_DEV_CLOSED;
	211
6aa1eb4e BV	212	if (!di->priv) {
	213	sr_err("Driver was not initialized.");
	214	return SR_ERR;
	215	}
46697e38	216
6aa1eb4e	217	devc = sdi->priv;
46697e38	218	ret = SR_OK;
035a1078	219	switch (id) {
361d1511	220	case SR_CONF_DATALOG:
7faf69da	221	if (g_variant_get_boolean(data)) {
361d1511 BV	222	/* Start logging. */
	223	ret = lascar_start_logging(sdi);
	224	} else {
	225	/* Stop logging. */
	226	ret = lascar_stop_logging(sdi);
	227	}
	228	break;
1953564a	229	case SR_CONF_LIMIT_SAMPLES:
7faf69da	230	devc->limit_samples = g_variant_get_uint64(data);
6aa1eb4e BV	231	sr_dbg("Setting sample limit to %" PRIu64 ".",
	232	devc->limit_samples);
	233	break;
46697e38	234	default:
bd6fbf62	235	ret = SR_ERR_NA;
46697e38 BV	236	}
	237
	238	return ret;
	239	}
	240
8f996b89 ML	241	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi,
8f996b89 ML	242	const struct sr_probe_group *probe_group)
a1c743fc	243	{
a1c743fc	244	(void)sdi;
8f996b89	245	(void)probe_group;
a1c743fc BV	246
a1c743fc BV	247	switch (key) {
0d485e30	248	case SR_CONF_SCAN_OPTIONS:
7faf69da BV	249	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	250	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
0d485e30	251	break;
9a6517d1	252	case SR_CONF_DEVICE_OPTIONS:
7faf69da BV	253	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	254	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	255	break;
a1c743fc	256	default:
bd6fbf62	257	return SR_ERR_NA;
a1c743fc BV	258	}
	259
	260	return SR_OK;
	261	}
	262
6aa1eb4e BV	263	static void mark_xfer(struct libusb_transfer *xfer)
	264	{
	265
	266	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	267	xfer->user_data = GINT_TO_POINTER(1);
	268	else
	269	xfer->user_data = GINT_TO_POINTER(-1);
	270
	271	}
	272
	273	/* The Lascar software, in its infinite ignorance, reads a set of four
	274	* bytes from the device config struct and interprets it as a float.
	275	* That only works because they only use windows, and only on x86. However
	276	* we may be running on any architecture, any operating system. So we have
	277	* to convert these four bytes as the Lascar software would on windows/x86,
	278	* to the local representation of a float.
	279	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	280	static float binary32_le_to_float(unsigned char *buf)
	281	{
	282	GFloatIEEE754 f;
	283
	284	f.v_float = 0;
	285	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	286	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	287	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	288
	289	return f.v_float;
	290	}
	291
	292	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	293	{
	294	struct dev_context *devc;
0f150649	295	struct sr_usb_dev_inst *usb;
361d1511	296	int dummy, ret;
6aa1eb4e BV	297
6aa1eb4e BV	298	devc = sdi->priv;
0f150649 BV	299	usb = sdi->conn;
	300
	301	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
6aa1eb4e BV	302	return SR_ERR;
	303
	304	ret = SR_OK;
	305	switch (devc->profile->logformat) {
	306	case LOG_TEMP_RH:
6787f404 BV	307	devc->sample_size = 2;
	308	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	309	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	310	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	311	/* Default to Celcius, we're all adults here. */
	312	devc->temp_unit = 0;
	313	} else
	314	sr_dbg("temperature unit is %s", devc->temp_unit
	315	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	316	break;
	317	case LOG_CO:
	318	devc->sample_size = 2;
6787f404 BV	319	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	320	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	321	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	322	devc->co_low);
	323	break;
	324	default:
	325	ret = SR_ERR_ARG;
	326	}
	327	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	328	sr_dbg("device log contains %d samples.", devc->logged_samples);
	329
	330	return ret;
	331	}
	332
6078d2c9	333	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
46697e38	334	{
6aa1eb4e	335	struct sr_datafeed_packet packet;
8e77bc20 BV	336	struct sr_datafeed_meta meta;
8e77bc20 BV	337	struct sr_config *src;
6aa1eb4e	338	struct dev_context *devc;
8e77bc20	339	struct drv_context *drvc;
0f150649	340	struct sr_usb_dev_inst *usb;
6aa1eb4e	341	struct libusb_transfer xfer_in, xfer_out;
6aa1eb4e	342	struct timeval tv;
8e77bc20	343	uint64_t interval;
6c60facc	344	int ret;
6aa1eb4e BV	345	unsigned char cmd[3], resp[4], *buf;
6aa1eb4e BV	346
e73ffd42 BV	347	if (sdi->status != SR_ST_ACTIVE)
	348	return SR_ERR_DEV_CLOSED;
	349
6aa1eb4e BV	350	if (!di->priv) {
	351	sr_err("Driver was not initialized.");
	352	return SR_ERR;
	353	}
	354
8e77bc20	355	drvc = di->priv;
6aa1eb4e	356	devc = sdi->priv;
0f150649	357	usb = sdi->conn;
6aa1eb4e BV	358	devc->cb_data = cb_data;
	359
	360	if (lascar_proc_config(sdi) != SR_OK)
	361	return SR_ERR;
	362
	363	sr_dbg("Starting log retrieval.");
	364
	365	/* Send header packet to the session bus. */
29a27196	366	std_session_send_df_header(cb_data, LOG_PREFIX);
6aa1eb4e	367
8e77bc20 BV	368	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	369	packet.type = SR_DF_META;
	370	packet.payload = &meta;
7faf69da	371	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
8e77bc20 BV	372	meta.config = g_slist_append(NULL, src);
	373	sr_session_send(devc->cb_data, &packet);
	374	g_free(src);
	375
6aa1eb4e BV	376	if (devc->logged_samples == 0) {
	377	/* This ensures the frontend knows the session is done. */
	378	packet.type = SR_DF_END;
	379	sr_session_send(devc->cb_data, &packet);
	380	return SR_OK;
	381	}
	382
	383	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	384	!(xfer_out = libusb_alloc_transfer(0)))
	385	return SR_ERR;
	386
0f150649	387	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	388	0x00, 0xffff, 0x00, NULL, 0, 50);
0f150649	389	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	390	0x02, 0x0002, 0x00, NULL, 0, 50);
0f150649	391	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e BV	392	0x02, 0x0001, 0x00, NULL, 0, 50);
	393
	394
	395	/* Flush input. The F321 requires this. */
0f150649	396	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
6aa1eb4e BV	397	256, &ret, 5) == 0 && ret > 0)
	398	;
	399
0f150649	400	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	401	resp, sizeof(resp), mark_xfer, 0, 10000);
	402	if (libusb_submit_transfer(xfer_in) != 0) {
	403	libusb_free_transfer(xfer_in);
	404	libusb_free_transfer(xfer_out);
	405	return SR_ERR;
	406	}
	407
	408	cmd[0] = 0x03;
	409	cmd[1] = 0xff;
	410	cmd[2] = 0xff;
0f150649	411	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
6aa1eb4e BV	412	cmd, 3, mark_xfer, 0, 100);
	413	if (libusb_submit_transfer(xfer_out) != 0) {
	414	libusb_free_transfer(xfer_in);
	415	libusb_free_transfer(xfer_out);
	416	return SR_ERR;
	417	}
	418
	419	tv.tv_sec = 0;
	420	tv.tv_usec = 0;
	421	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	422	g_usleep(5000);
	423	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	424	}
	425	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	426	xfer_in->user_data != GINT_TO_POINTER(1)) {
	427	sr_dbg("no response to log transfer request");
	428	libusb_free_transfer(xfer_in);
	429	libusb_free_transfer(xfer_out);
	430	return SR_ERR;
	431	}
	432	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	433	sr_dbg("invalid response to log transfer request");
	434	libusb_free_transfer(xfer_in);
	435	libusb_free_transfer(xfer_out);
	436	return SR_ERR;
	437	}
	438	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	439	libusb_free_transfer(xfer_out);
	440
6c60facc	441	usb_source_add(drvc->sr_ctx, 100, lascar_el_usb_handle_events, (void *)sdi);
6aa1eb4e BV	442
6aa1eb4e BV	443	buf = g_try_malloc(4096);
0f150649	444	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	445	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	446	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	447	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	448	libusb_free_transfer(xfer_in);
	449	g_free(buf);
	450	return SR_ERR;
	451	}
46697e38 BV	452
	453	return SR_OK;
	454	}
	455
6078d2c9	456	SR_PRIV int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	457	{
	458	(void)cb_data;
	459
6aa1eb4e BV	460	if (!di->priv) {
	461	sr_err("Driver was not initialized.");
	462	return SR_ERR;
	463	}
	464
46697e38 BV	465	if (sdi->status != SR_ST_ACTIVE) {
	466	sr_err("Device inactive, can't stop acquisition.");
	467	return SR_ERR;
	468	}
	469
6aa1eb4e BV	470	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	471	/* TODO: free ongoing transfers? */
46697e38 BV	472
	473	return SR_OK;
	474	}
	475
	476	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	477	.name = "lascar-el-usb",
	478	.longname = "Lascar EL-USB",
	479	.api_version = 1,
6078d2c9 UH	480	.init = init,
	481	.cleanup = cleanup,
	482	.scan = scan,
	483	.dev_list = dev_list,
3b412e3a	484	.dev_clear = dev_clear,
361d1511	485	.config_get = config_get,
035a1078	486	.config_set = config_set,
a1c743fc	487	.config_list = config_list,
6078d2c9 UH	488	.dev_open = dev_open,
	489	.dev_close = dev_close,
	490	.dev_acquisition_start = dev_acquisition_start,
	491	.dev_acquisition_stop = dev_acquisition_stop,
46697e38 BV	492	.priv = NULL,
46697e38 BV	493	};