[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(sdi->conn);
		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 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;
			}
			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 *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 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 hw_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 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;
	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 (!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;
	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 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 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 (!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, 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(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 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
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;
851d5b22	29	static int hw_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
851d5b22	59	hw_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
851d5b22	70	static int hw_init(struct sr_context *sr_ctx)
46697e38	71	{
063e7aef	72	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
46697e38 BV	73	}
	74
	75	static GSList hw_scan(GSList options)
	76	{
	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 BV	83
	84	(void)options;
	85
4b97c74e	86	drvc = di->priv;
46697e38	87
851d5b22 BV	88	/* USB scan is always authoritative. */
	89	clear_instances();
	90
	91	conn = NULL;
	92	for (l = options; l; l = l->next) {
1987b8d6 BV	93	src = l->data;
1987b8d6 BV	94	switch (src->key) {
1953564a	95	case SR_CONF_CONN:
7faf69da	96	conn = g_variant_get_string(src->data, NULL);
851d5b22 BV	97	break;
	98	}
	99	}
	100	if (!conn)
	101	return NULL;
	102
	103	devices = NULL;
	104	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	105	/* We have a list of sr_usb_dev_inst matching the connection
	106	* string. Wrap them in sr_dev_inst and we're done. */
	107	for (l = usb_devices; l; l = l->next) {
	108	usb = l->data;
	109	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	110	/* Not a Lascar EL-USB. */
	111	g_free(usb);
	112	continue;
	113	}
0f150649 BV	114	sdi->inst_type = SR_INST_USB;
0f150649 BV	115	sdi->conn = usb;
851d5b22 BV	116	drvc->instances = g_slist_append(drvc->instances, sdi);
	117	devices = g_slist_append(devices, sdi);
	118	}
	119	g_slist_free(usb_devices);
	120	} else
	121	g_slist_free_full(usb_devices, g_free);
46697e38 BV	122
	123	return devices;
	124	}
	125
	126	static GSList *hw_dev_list(void)
	127	{
0e94d524	128	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	129	}
	130
	131	static int hw_dev_open(struct sr_dev_inst *sdi)
	132	{
6aa1eb4e	133	struct drv_context *drvc;
0f150649	134	struct sr_usb_dev_inst *usb;
6aa1eb4e	135	int ret;
46697e38	136
6aa1eb4e BV	137	if (!(drvc = di->priv)) {
	138	sr_err("Driver was not initialized.");
	139	return SR_ERR;
	140	}
	141
0f150649 BV	142	usb = sdi->conn;
	143
	144	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
6aa1eb4e BV	145	return SR_ERR;
6aa1eb4e BV	146
0f150649	147	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
6aa1eb4e BV	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;
46697e38 BV	154	}
	155
	156	static int hw_dev_close(struct sr_dev_inst *sdi)
	157	{
0f150649	158	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	159
	160	if (!di->priv) {
	161	sr_err("Driver was not initialized.");
	162	return SR_ERR;
	163	}
	164
0f150649 BV	165	usb = sdi->conn;
	166
	167	if (!usb->devhdl)
6aa1eb4e BV	168	/* Nothing to do. */
	169	return SR_OK;
	170
0f150649 BV	171	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	172	libusb_close(usb->devhdl);
	173	usb->devhdl = NULL;
6aa1eb4e BV	174	sdi->status = SR_ST_INACTIVE;
6aa1eb4e BV	175
46697e38 BV	176	return SR_OK;
	177	}
	178
	179	static int hw_cleanup(void)
	180	{
6aa1eb4e	181	struct drv_context *drvc;
46697e38	182
6aa1eb4e BV	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;
46697e38 BV	190
	191	return SR_OK;
	192	}
	193
7faf69da	194	static int config_get(int id, GVariant *data, const struct sr_dev_inst sdi)
361d1511 BV	195	{
361d1511 BV	196	struct dev_context *devc;
0f150649	197	struct sr_usb_dev_inst *usb;
361d1511	198	int ret;
0f150649	199	char str[128];
361d1511 BV	200
	201	devc = sdi->priv;
	202	switch (id) {
0f150649 BV	203	case SR_CONF_CONN:
	204	if (!sdi \|\| !sdi->conn)
	205	return SR_ERR_ARG;
	206	usb = sdi->conn;
	207	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	208	*data = g_variant_new_string(str);
	209	break;
361d1511 BV	210	case SR_CONF_DATALOG:
	211	if (!sdi)
	212	return SR_ERR_ARG;
	213	if ((ret = lascar_is_logging(sdi)) == -1)
	214	return SR_ERR;
7faf69da	215	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
361d1511 BV	216	break;
361d1511 BV	217	case SR_CONF_LIMIT_SAMPLES:
7faf69da	218	*data = g_variant_new_uint64(devc->limit_samples);
361d1511 BV	219	break;
361d1511 BV	220	default:
bd6fbf62	221	return SR_ERR_NA;
361d1511 BV	222	}
	223
	224	return SR_OK;
	225	}
	226
7faf69da	227	static int config_set(int id, GVariant data, const struct sr_dev_inst sdi)
46697e38	228	{
6aa1eb4e	229	struct dev_context *devc;
46697e38 BV	230	int ret;
46697e38 BV	231
6aa1eb4e BV	232	if (!di->priv) {
	233	sr_err("Driver was not initialized.");
	234	return SR_ERR;
	235	}
46697e38 BV	236	if (sdi->status != SR_ST_ACTIVE) {
	237	sr_err("Device inactive, can't set config options.");
	238	return SR_ERR;
	239	}
	240
6aa1eb4e	241	devc = sdi->priv;
46697e38	242	ret = SR_OK;
035a1078	243	switch (id) {
361d1511	244	case SR_CONF_DATALOG:
7faf69da	245	if (g_variant_get_boolean(data)) {
361d1511 BV	246	/* Start logging. */
	247	ret = lascar_start_logging(sdi);
	248	} else {
	249	/* Stop logging. */
	250	ret = lascar_stop_logging(sdi);
	251	}
	252	break;
1953564a	253	case SR_CONF_LIMIT_SAMPLES:
7faf69da	254	devc->limit_samples = g_variant_get_uint64(data);
6aa1eb4e BV	255	sr_dbg("Setting sample limit to %" PRIu64 ".",
	256	devc->limit_samples);
	257	break;
46697e38	258	default:
bd6fbf62	259	ret = SR_ERR_NA;
46697e38 BV	260	}
	261
	262	return ret;
	263	}
	264
7faf69da	265	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
a1c743fc BV	266	{
	267
	268	(void)sdi;
	269
	270	switch (key) {
0d485e30	271	case SR_CONF_SCAN_OPTIONS:
7faf69da BV	272	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	273	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
0d485e30	274	break;
9a6517d1	275	case SR_CONF_DEVICE_OPTIONS:
7faf69da BV	276	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
7faf69da BV	277	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
9a6517d1	278	break;
a1c743fc	279	default:
bd6fbf62	280	return SR_ERR_NA;
a1c743fc BV	281	}
	282
	283	return SR_OK;
	284	}
	285
6aa1eb4e BV	286	static void mark_xfer(struct libusb_transfer *xfer)
	287	{
	288
	289	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	290	xfer->user_data = GINT_TO_POINTER(1);
	291	else
	292	xfer->user_data = GINT_TO_POINTER(-1);
	293
	294	}
	295
	296	/* The Lascar software, in its infinite ignorance, reads a set of four
	297	* bytes from the device config struct and interprets it as a float.
	298	* That only works because they only use windows, and only on x86. However
	299	* we may be running on any architecture, any operating system. So we have
	300	* to convert these four bytes as the Lascar software would on windows/x86,
	301	* to the local representation of a float.
	302	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	303	static float binary32_le_to_float(unsigned char *buf)
	304	{
	305	GFloatIEEE754 f;
	306
	307	f.v_float = 0;
	308	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	309	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	310	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	311
	312	return f.v_float;
	313	}
	314
	315	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	316	{
	317	struct dev_context *devc;
0f150649	318	struct sr_usb_dev_inst *usb;
361d1511	319	int dummy, ret;
6aa1eb4e BV	320
6aa1eb4e BV	321	devc = sdi->priv;
0f150649 BV	322	usb = sdi->conn;
	323
	324	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
6aa1eb4e BV	325	return SR_ERR;
	326
	327	ret = SR_OK;
	328	switch (devc->profile->logformat) {
	329	case LOG_TEMP_RH:
6787f404 BV	330	devc->sample_size = 2;
	331	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	332	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	333	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	334	/* Default to Celcius, we're all adults here. */
	335	devc->temp_unit = 0;
	336	} else
	337	sr_dbg("temperature unit is %s", devc->temp_unit
	338	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	339	break;
	340	case LOG_CO:
	341	devc->sample_size = 2;
6787f404 BV	342	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	343	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	344	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	345	devc->co_low);
	346	break;
	347	default:
	348	ret = SR_ERR_ARG;
	349	}
	350	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	351	sr_dbg("device log contains %d samples.", devc->logged_samples);
	352
	353	return ret;
	354	}
	355
46697e38	356	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	357	void *cb_data)
46697e38	358	{
6aa1eb4e	359	struct sr_datafeed_packet packet;
8e77bc20 BV	360	struct sr_datafeed_meta meta;
8e77bc20 BV	361	struct sr_config *src;
6aa1eb4e	362	struct dev_context *devc;
8e77bc20	363	struct drv_context *drvc;
0f150649	364	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	365	struct libusb_transfer xfer_in, xfer_out;
	366	const struct libusb_pollfd **pfd;
	367	struct timeval tv;
8e77bc20	368	uint64_t interval;
6aa1eb4e BV	369	int ret, i;
	370	unsigned char cmd[3], resp[4], *buf;
	371
	372	if (!di->priv) {
	373	sr_err("Driver was not initialized.");
	374	return SR_ERR;
	375	}
	376
8e77bc20	377	drvc = di->priv;
6aa1eb4e	378	devc = sdi->priv;
0f150649	379	usb = sdi->conn;
6aa1eb4e BV	380	devc->cb_data = cb_data;
	381
	382	if (lascar_proc_config(sdi) != SR_OK)
	383	return SR_ERR;
	384
	385	sr_dbg("Starting log retrieval.");
	386
	387	/* Send header packet to the session bus. */
4afdfd46	388	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
6aa1eb4e	389
8e77bc20 BV	390	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	391	packet.type = SR_DF_META;
	392	packet.payload = &meta;
7faf69da	393	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
8e77bc20 BV	394	meta.config = g_slist_append(NULL, src);
	395	sr_session_send(devc->cb_data, &packet);
	396	g_free(src);
	397
6aa1eb4e BV	398	if (devc->logged_samples == 0) {
	399	/* This ensures the frontend knows the session is done. */
	400	packet.type = SR_DF_END;
	401	sr_session_send(devc->cb_data, &packet);
	402	return SR_OK;
	403	}
	404
	405	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	406	!(xfer_out = libusb_alloc_transfer(0)))
	407	return SR_ERR;
	408
0f150649	409	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	410	0x00, 0xffff, 0x00, NULL, 0, 50);
0f150649	411	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	412	0x02, 0x0002, 0x00, NULL, 0, 50);
0f150649	413	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e BV	414	0x02, 0x0001, 0x00, NULL, 0, 50);
	415
	416
	417	/* Flush input. The F321 requires this. */
0f150649	418	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
6aa1eb4e BV	419	256, &ret, 5) == 0 && ret > 0)
	420	;
	421
0f150649	422	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	423	resp, sizeof(resp), mark_xfer, 0, 10000);
	424	if (libusb_submit_transfer(xfer_in) != 0) {
	425	libusb_free_transfer(xfer_in);
	426	libusb_free_transfer(xfer_out);
	427	return SR_ERR;
	428	}
	429
	430	cmd[0] = 0x03;
	431	cmd[1] = 0xff;
	432	cmd[2] = 0xff;
0f150649	433	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
6aa1eb4e BV	434	cmd, 3, mark_xfer, 0, 100);
	435	if (libusb_submit_transfer(xfer_out) != 0) {
	436	libusb_free_transfer(xfer_in);
	437	libusb_free_transfer(xfer_out);
	438	return SR_ERR;
	439	}
	440
	441	tv.tv_sec = 0;
	442	tv.tv_usec = 0;
	443	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	444	g_usleep(5000);
	445	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	446	}
	447	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	448	xfer_in->user_data != GINT_TO_POINTER(1)) {
	449	sr_dbg("no response to log transfer request");
	450	libusb_free_transfer(xfer_in);
	451	libusb_free_transfer(xfer_out);
	452	return SR_ERR;
	453	}
	454	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	455	sr_dbg("invalid response to log transfer request");
	456	libusb_free_transfer(xfer_in);
	457	libusb_free_transfer(xfer_out);
	458	return SR_ERR;
	459	}
	460	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	461	libusb_free_transfer(xfer_out);
	462
6aa1eb4e BV	463	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	464	for (i = 0; pfd[i]; i++) {
	465	/* Handle USB events every 100ms, for decent latency. */
	466	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	467	lascar_el_usb_handle_events, (void *)sdi);
	468	/* We'll need to remove this fd later. */
	469	devc->usbfd[i] = pfd[i]->fd;
	470	}
	471	devc->usbfd[i] = -1;
	472
	473	buf = g_try_malloc(4096);
0f150649	474	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	475	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	476	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	477	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	478	libusb_free_transfer(xfer_in);
	479	g_free(buf);
	480	return SR_ERR;
	481	}
46697e38 BV	482
	483	return SR_OK;
	484	}
	485
6aa1eb4e	486	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	487	{
	488	(void)cb_data;
	489
6aa1eb4e BV	490	if (!di->priv) {
	491	sr_err("Driver was not initialized.");
	492	return SR_ERR;
	493	}
	494
46697e38 BV	495	if (sdi->status != SR_ST_ACTIVE) {
	496	sr_err("Device inactive, can't stop acquisition.");
	497	return SR_ERR;
	498	}
	499
6aa1eb4e BV	500	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	501	/* TODO: free ongoing transfers? */
46697e38 BV	502
	503	return SR_OK;
	504	}
	505
	506	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	507	.name = "lascar-el-usb",
	508	.longname = "Lascar EL-USB",
	509	.api_version = 1,
	510	.init = hw_init,
	511	.cleanup = hw_cleanup,
	512	.scan = hw_scan,
	513	.dev_list = hw_dev_list,
	514	.dev_clear = clear_instances,
361d1511	515	.config_get = config_get,
035a1078	516	.config_set = config_set,
a1c743fc	517	.config_list = config_list,
46697e38 BV	518	.dev_open = hw_dev_open,
46697e38 BV	519	.dev_close = hw_dev_close,
46697e38 BV	520	.dev_acquisition_start = hw_dev_acquisition_start,
	521	.dev_acquisition_stop = hw_dev_acquisition_stop,
	522	.priv = NULL,
	523	};