[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 int hwopts[] = {
	SR_CONF_CONN,
	0,
};

static const int hwcaps[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_HYGROMETER,
	SR_CONF_LIMIT_SAMPLES,
	0
};

/* 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)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

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;

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

	/* 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 = src->value;
			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)
{
	struct drv_context *drvc;

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

	return drvc->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;
	g_free(devc->config);
	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 hw_info_get(int info_id, const void **data,
		const struct sr_dev_inst *sdi)
{
	(void)sdi;

	switch (info_id) {
	case SR_DI_HWOPTS:
		*data = hwopts;
		break;
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value)
{
	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 (hwcap) {
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown hardware capability: %d.", hwcap);
		ret = SR_ERR_ARG;
	}

	return ret;
}

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 ret;

	devc = sdi->priv;
	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
		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_header header;
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	struct libusb_transfer *xfer_in, *xfer_out;
	const struct libusb_pollfd **pfd;
	struct timeval tv;
	int ret, i;
	unsigned char cmd[3], resp[4], *buf;

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

	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. */
	sr_dbg("Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	sr_session_send(devc->cb_data, &packet);

	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,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.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 BV	30
851d5b22 BV	31	static const int hwopts[] = {
1953564a	32	SR_CONF_CONN,
851d5b22 BV	33	0,
	34	};
	35
	36	static const int hwcaps[] = {
1953564a BV	37	SR_CONF_THERMOMETER,
	38	SR_CONF_HYGROMETER,
	39	SR_CONF_LIMIT_SAMPLES,
851d5b22 BV	40	0
	41	};
	42
46697e38 BV	43	/* Properly close and free all devices. */
	44	static int clear_instances(void)
	45	{
	46	struct sr_dev_inst *sdi;
	47	struct drv_context *drvc;
	48	struct dev_context *devc;
	49	GSList *l;
	50
	51	if (!(drvc = di->priv))
	52	return SR_OK;
	53
	54	for (l = drvc->instances; l; l = l->next) {
	55	if (!(sdi = l->data))
	56	continue;
	57	if (!(devc = sdi->priv))
	58	continue;
	59
851d5b22 BV	60	hw_dev_close(sdi);
851d5b22 BV	61	sr_usb_dev_inst_free(devc->usb);
46697e38 BV	62	sr_dev_inst_free(sdi);
	63	}
	64
	65	g_slist_free(drvc->instances);
	66	drvc->instances = NULL;
	67
	68	return SR_OK;
	69	}
	70
851d5b22	71	static int hw_init(struct sr_context *sr_ctx)
46697e38 BV	72	{
	73	struct drv_context *drvc;
	74
	75	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	76	sr_err("Driver context malloc failed.");
	77	return SR_ERR_MALLOC;
	78	}
	79
851d5b22	80	drvc->sr_ctx = sr_ctx;
46697e38 BV	81	di->priv = drvc;
	82
	83	return SR_OK;
	84	}
	85
	86	static GSList hw_scan(GSList options)
	87	{
	88	struct drv_context *drvc;
851d5b22 BV	89	struct dev_context *devc;
	90	struct sr_dev_inst *sdi;
	91	struct sr_usb_dev_inst *usb;
1987b8d6	92	struct sr_config *src;
851d5b22 BV	93	GSList usb_devices, devices, *l;
851d5b22 BV	94	const char *conn;
46697e38 BV	95
	96	(void)options;
	97
851d5b22 BV	98	if (!(drvc = di->priv)) {
	99	sr_err("Driver was not initialized.");
	100	return NULL;
	101	}
46697e38	102
851d5b22 BV	103	/* USB scan is always authoritative. */
	104	clear_instances();
	105
	106	conn = NULL;
	107	for (l = options; l; l = l->next) {
1987b8d6 BV	108	src = l->data;
1987b8d6 BV	109	switch (src->key) {
1953564a	110	case SR_CONF_CONN:
1987b8d6	111	conn = src->value;
851d5b22 BV	112	break;
	113	}
	114	}
	115	if (!conn)
	116	return NULL;
	117
	118	devices = NULL;
	119	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	120	/* We have a list of sr_usb_dev_inst matching the connection
	121	* string. Wrap them in sr_dev_inst and we're done. */
	122	for (l = usb_devices; l; l = l->next) {
	123	usb = l->data;
	124	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	125	/* Not a Lascar EL-USB. */
	126	g_free(usb);
	127	continue;
	128	}
6aa1eb4e	129	devc = sdi->priv;
851d5b22	130	devc->usb = usb;
851d5b22 BV	131	drvc->instances = g_slist_append(drvc->instances, sdi);
	132	devices = g_slist_append(devices, sdi);
	133	}
	134	g_slist_free(usb_devices);
	135	} else
	136	g_slist_free_full(usb_devices, g_free);
46697e38 BV	137
	138	return devices;
	139	}
	140
	141	static GSList *hw_dev_list(void)
	142	{
	143	struct drv_context *drvc;
	144
6aa1eb4e BV	145	if (!(drvc = di->priv)) {
	146	sr_err("Driver was not initialized.");
	147	return NULL;
	148	}
46697e38 BV	149
	150	return drvc->instances;
	151	}
	152
	153	static int hw_dev_open(struct sr_dev_inst *sdi)
	154	{
6aa1eb4e BV	155	struct drv_context *drvc;
	156	struct dev_context *devc;
	157	int ret;
46697e38	158
6aa1eb4e BV	159	if (!(drvc = di->priv)) {
	160	sr_err("Driver was not initialized.");
	161	return SR_ERR;
	162	}
	163
	164	devc = sdi->priv;
	165	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	166	return SR_ERR;
	167
	168	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	169	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	170	return SR_ERR;
	171	}
	172	sdi->status = SR_ST_ACTIVE;
	173
	174	return ret;
46697e38 BV	175	}
	176
	177	static int hw_dev_close(struct sr_dev_inst *sdi)
	178	{
6aa1eb4e BV	179	struct dev_context *devc;
	180
	181	if (!di->priv) {
	182	sr_err("Driver was not initialized.");
	183	return SR_ERR;
	184	}
	185
	186	devc = sdi->priv;
	187	if (!devc->usb->devhdl)
	188	/* Nothing to do. */
	189	return SR_OK;
	190
	191	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	192	libusb_close(devc->usb->devhdl);
	193	devc->usb->devhdl = NULL;
	194	g_free(devc->config);
	195	sdi->status = SR_ST_INACTIVE;
	196
46697e38 BV	197
	198	return SR_OK;
	199	}
	200
	201	static int hw_cleanup(void)
	202	{
6aa1eb4e	203	struct drv_context *drvc;
46697e38	204
6aa1eb4e BV	205	if (!(drvc = di->priv))
	206	/* Can get called on an unused driver, doesn't matter. */
	207	return SR_OK;
	208
	209	clear_instances();
	210	g_free(drvc);
	211	di->priv = NULL;
46697e38 BV	212
	213	return SR_OK;
	214	}
	215
	216	static int hw_info_get(int info_id, const void **data,
851d5b22	217	const struct sr_dev_inst *sdi)
46697e38	218	{
6aa1eb4e BV	219	(void)sdi;
6aa1eb4e BV	220
46697e38	221	switch (info_id) {
6aa1eb4e BV	222	case SR_DI_HWOPTS:
	223	*data = hwopts;
	224	break;
	225	case SR_DI_HWCAPS:
	226	*data = hwcaps;
	227	break;
46697e38	228	default:
46697e38 BV	229	return SR_ERR_ARG;
	230	}
	231
	232	return SR_OK;
	233	}
	234
	235	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
851d5b22	236	const void *value)
46697e38	237	{
6aa1eb4e	238	struct dev_context *devc;
46697e38 BV	239	int ret;
46697e38 BV	240
6aa1eb4e BV	241	if (!di->priv) {
	242	sr_err("Driver was not initialized.");
	243	return SR_ERR;
	244	}
46697e38 BV	245	if (sdi->status != SR_ST_ACTIVE) {
	246	sr_err("Device inactive, can't set config options.");
	247	return SR_ERR;
	248	}
	249
6aa1eb4e	250	devc = sdi->priv;
46697e38 BV	251	ret = SR_OK;
46697e38 BV	252	switch (hwcap) {
1953564a	253	case SR_CONF_LIMIT_SAMPLES:
6aa1eb4e BV	254	devc->limit_samples = (const uint64_t )value;
	255	sr_dbg("Setting sample limit to %" PRIu64 ".",
	256	devc->limit_samples);
	257	break;
46697e38 BV	258	default:
	259	sr_err("Unknown hardware capability: %d.", hwcap);
	260	ret = SR_ERR_ARG;
	261	}
	262
	263	return ret;
	264	}
	265
6aa1eb4e BV	266	static void mark_xfer(struct libusb_transfer *xfer)
	267	{
	268
	269	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	270	xfer->user_data = GINT_TO_POINTER(1);
	271	else
	272	xfer->user_data = GINT_TO_POINTER(-1);
	273
	274	}
	275
	276	/* The Lascar software, in its infinite ignorance, reads a set of four
	277	* bytes from the device config struct and interprets it as a float.
	278	* That only works because they only use windows, and only on x86. However
	279	* we may be running on any architecture, any operating system. So we have
	280	* to convert these four bytes as the Lascar software would on windows/x86,
	281	* to the local representation of a float.
	282	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	283	static float binary32_le_to_float(unsigned char *buf)
	284	{
	285	GFloatIEEE754 f;
	286
	287	f.v_float = 0;
	288	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	289	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	290	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	291
	292	return f.v_float;
	293	}
	294
	295	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	296	{
	297	struct dev_context *devc;
	298	int ret;
	299
	300	devc = sdi->priv;
	301	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
	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
46697e38	333	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	334	void *cb_data)
46697e38	335	{
6aa1eb4e BV	336	struct sr_datafeed_packet packet;
6aa1eb4e BV	337	struct sr_datafeed_header header;
6aa1eb4e BV	338	struct dev_context *devc;
	339	struct drv_context *drvc = di->priv;
	340	struct libusb_transfer xfer_in, xfer_out;
	341	const struct libusb_pollfd **pfd;
	342	struct timeval tv;
	343	int ret, i;
	344	unsigned char cmd[3], resp[4], *buf;
	345
	346	if (!di->priv) {
	347	sr_err("Driver was not initialized.");
	348	return SR_ERR;
	349	}
	350
	351	devc = sdi->priv;
	352	devc->cb_data = cb_data;
	353
	354	if (lascar_proc_config(sdi) != SR_OK)
	355	return SR_ERR;
	356
	357	sr_dbg("Starting log retrieval.");
	358
	359	/* Send header packet to the session bus. */
	360	sr_dbg("Sending SR_DF_HEADER.");
	361	packet.type = SR_DF_HEADER;
	362	packet.payload = (uint8_t *)&header;
	363	header.feed_version = 1;
	364	sr_session_send(devc->cb_data, &packet);
	365
	366	if (devc->logged_samples == 0) {
	367	/* This ensures the frontend knows the session is done. */
	368	packet.type = SR_DF_END;
	369	sr_session_send(devc->cb_data, &packet);
	370	return SR_OK;
	371	}
	372
	373	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	374	!(xfer_out = libusb_alloc_transfer(0)))
	375	return SR_ERR;
	376
	377	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	378	0x00, 0xffff, 0x00, NULL, 0, 50);
	379	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	380	0x02, 0x0002, 0x00, NULL, 0, 50);
	381	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	382	0x02, 0x0001, 0x00, NULL, 0, 50);
	383
	384
	385	/* Flush input. The F321 requires this. */
	386	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	387	256, &ret, 5) == 0 && ret > 0)
	388	;
	389
	390	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	391	resp, sizeof(resp), mark_xfer, 0, 10000);
	392	if (libusb_submit_transfer(xfer_in) != 0) {
	393	libusb_free_transfer(xfer_in);
	394	libusb_free_transfer(xfer_out);
	395	return SR_ERR;
	396	}
	397
	398	cmd[0] = 0x03;
	399	cmd[1] = 0xff;
	400	cmd[2] = 0xff;
	401	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
402	cmd, 3, mark_xfer, 0, 100);
403	if (libusb_submit_transfer(xfer_out) != 0) {
404	libusb_free_transfer(xfer_in);
405	libusb_free_transfer(xfer_out);
406	return SR_ERR;
407	}
408
409	tv.tv_sec = 0;
410	tv.tv_usec = 0;
411	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
412	g_usleep(5000);
413	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
414	}
415	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
416	xfer_in->user_data != GINT_TO_POINTER(1)) {
417	sr_dbg("no response to log transfer request");
418	libusb_free_transfer(xfer_in);
419	libusb_free_transfer(xfer_out);
420	return SR_ERR;
421	}
422	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
423	sr_dbg("invalid response to log transfer request");
424	libusb_free_transfer(xfer_in);
425	libusb_free_transfer(xfer_out);
426	return SR_ERR;
427	}
428	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
429	libusb_free_transfer(xfer_out);
430
6aa1eb4e BV	431	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	432	for (i = 0; pfd[i]; i++) {
	433	/* Handle USB events every 100ms, for decent latency. */
	434	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	435	lascar_el_usb_handle_events, (void *)sdi);
	436	/* We'll need to remove this fd later. */
	437	devc->usbfd[i] = pfd[i]->fd;
	438	}
	439	devc->usbfd[i] = -1;
	440
	441	buf = g_try_malloc(4096);
	442	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	443	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	444	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	445	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	446	libusb_free_transfer(xfer_in);
	447	g_free(buf);
	448	return SR_ERR;
	449	}
46697e38 BV	450
	451	return SR_OK;
	452	}
	453
6aa1eb4e	454	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	455	{
	456	(void)cb_data;
	457
6aa1eb4e BV	458	if (!di->priv) {
	459	sr_err("Driver was not initialized.");
	460	return SR_ERR;
	461	}
	462
46697e38 BV	463	if (sdi->status != SR_ST_ACTIVE) {
	464	sr_err("Device inactive, can't stop acquisition.");
	465	return SR_ERR;
	466	}
	467
6aa1eb4e BV	468	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	469	/* TODO: free ongoing transfers? */
46697e38 BV	470
	471	return SR_OK;
	472	}
	473
	474	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	475	.name = "lascar-el-usb",
	476	.longname = "Lascar EL-USB",
	477	.api_version = 1,
	478	.init = hw_init,
	479	.cleanup = hw_cleanup,
	480	.scan = hw_scan,
	481	.dev_list = hw_dev_list,
	482	.dev_clear = clear_instances,
	483	.dev_open = hw_dev_open,
	484	.dev_close = hw_dev_close,
	485	.info_get = hw_info_get,
	486	.dev_config_set = hw_dev_config_set,
	487	.dev_acquisition_start = hw_dev_acquisition_start,
	488	.dev_acquisition_stop = hw_dev_acquisition_stop,
	489	.priv = NULL,
	490	};