[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)
{
	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
}

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

	(void)options;

	drvc = di->priv;

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

	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = 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)
{
	return ((struct drv_context *)(di->priv))->instances;
}

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

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

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

	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
		sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
		return SR_ERR;
	}
	sdi->status = SR_ST_ACTIVE;

	return ret;
}

static int hw_dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

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

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

	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	libusb_close(devc->usb->devhdl);
	devc->usb->devhdl = NULL;
	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 config_set(int id, const void *value, 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_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.", id);
		ret = SR_ERR_ARG;
	}

	return ret;
}

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

	(void)sdi;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = hwopts;
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = hwcaps;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static void mark_xfer(struct libusb_transfer *xfer)
{

	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
		xfer->user_data = GINT_TO_POINTER(1);
	else
		xfer->user_data = GINT_TO_POINTER(-1);

}

/* The Lascar software, in its infinite ignorance, reads a set of four
 * bytes from the device config struct and interprets it as a float.
 * That only works because they only use windows, and only on x86. However
 * we may be running on any architecture, any operating system. So we have
 * to convert these four bytes as the Lascar software would on windows/x86,
 * to the local representation of a float.
 * The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
static float binary32_le_to_float(unsigned char *buf)
{
	GFloatIEEE754 f;

	f.v_float = 0;
	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	f.mpn.biased_exponent = (buf[3] << 1) | (buf[2] >> 7);
	f.mpn.mantissa = buf[0] | (buf[1] << 8) | ((buf[2] & 0x7f) << 16);

	return f.v_float;
}

static int lascar_proc_config(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int 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 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. */
	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);

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

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

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


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

	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
			resp, sizeof(resp), mark_xfer, 0, 10000);
	if (libusb_submit_transfer(xfer_in) != 0) {
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}

	cmd[0] = 0x03;
	cmd[1] = 0xff;
	cmd[2] = 0xff;
	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
			cmd, 3, mark_xfer, 0, 100);
	if (libusb_submit_transfer(xfer_out) != 0) {
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}

	tv.tv_sec = 0;
	tv.tv_usec = 0;
	while (!xfer_in->user_data || !xfer_out->user_data) {
		g_usleep(5000);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}
	if (xfer_in->user_data != GINT_TO_POINTER(1) ||
			xfer_in->user_data != GINT_TO_POINTER(1)) {
		sr_dbg("no response to log transfer request");
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}
	if (xfer_in->actual_length != 3 || xfer_in->buffer[0] != 2) {
		sr_dbg("invalid response to log transfer request");
		libusb_free_transfer(xfer_in);
		libusb_free_transfer(xfer_out);
		return SR_ERR;
	}
	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	libusb_free_transfer(xfer_out);

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

	buf = g_try_malloc(4096);
	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
			buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
		sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
		libusb_free_transfer(xfer_in);
		g_free(buf);
		return SR_ERR;
	}

	return SR_OK;
}

SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	(void)cb_data;

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

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't stop acquisition.");
		return SR_ERR;
	}

	sdi->status = SR_ST_STOPPING;
	/* TODO: free ongoing transfers? */

	return SR_OK;
}

SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	.name = "lascar-el-usb",
	.longname = "Lascar EL-USB",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.config_get = NULL,
	.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 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	72	{
063e7aef	73	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
46697e38 BV	74	}
	75
	76	static GSList hw_scan(GSList options)
	77	{
	78	struct drv_context *drvc;
851d5b22 BV	79	struct dev_context *devc;
	80	struct sr_dev_inst *sdi;
	81	struct sr_usb_dev_inst *usb;
1987b8d6	82	struct sr_config *src;
851d5b22 BV	83	GSList usb_devices, devices, *l;
851d5b22 BV	84	const char *conn;
46697e38 BV	85
	86	(void)options;
	87
4b97c74e	88	drvc = di->priv;
46697e38	89
851d5b22 BV	90	/* USB scan is always authoritative. */
	91	clear_instances();
	92
	93	conn = NULL;
	94	for (l = options; l; l = l->next) {
1987b8d6 BV	95	src = l->data;
1987b8d6 BV	96	switch (src->key) {
1953564a	97	case SR_CONF_CONN:
1987b8d6	98	conn = src->value;
851d5b22 BV	99	break;
	100	}
	101	}
	102	if (!conn)
	103	return NULL;
	104
	105	devices = NULL;
	106	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	107	/* We have a list of sr_usb_dev_inst matching the connection
	108	* string. Wrap them in sr_dev_inst and we're done. */
	109	for (l = usb_devices; l; l = l->next) {
	110	usb = l->data;
	111	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	112	/* Not a Lascar EL-USB. */
	113	g_free(usb);
	114	continue;
	115	}
6aa1eb4e	116	devc = sdi->priv;
851d5b22	117	devc->usb = usb;
851d5b22 BV	118	drvc->instances = g_slist_append(drvc->instances, sdi);
	119	devices = g_slist_append(devices, sdi);
	120	}
	121	g_slist_free(usb_devices);
	122	} else
	123	g_slist_free_full(usb_devices, g_free);
46697e38 BV	124
	125	return devices;
	126	}
	127
	128	static GSList *hw_dev_list(void)
	129	{
0e94d524	130	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	131	}
	132
	133	static int hw_dev_open(struct sr_dev_inst *sdi)
	134	{
6aa1eb4e BV	135	struct drv_context *drvc;
	136	struct dev_context *devc;
	137	int ret;
46697e38	138
6aa1eb4e BV	139	if (!(drvc = di->priv)) {
	140	sr_err("Driver was not initialized.");
	141	return SR_ERR;
	142	}
	143
	144	devc = sdi->priv;
	145	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	146	return SR_ERR;
	147
	148	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	149	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	150	return SR_ERR;
	151	}
	152	sdi->status = SR_ST_ACTIVE;
	153
	154	return ret;
46697e38 BV	155	}
	156
	157	static int hw_dev_close(struct sr_dev_inst *sdi)
	158	{
6aa1eb4e BV	159	struct dev_context *devc;
	160
	161	if (!di->priv) {
	162	sr_err("Driver was not initialized.");
	163	return SR_ERR;
	164	}
	165
	166	devc = sdi->priv;
	167	if (!devc->usb->devhdl)
	168	/* Nothing to do. */
	169	return SR_OK;
	170
	171	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	172	libusb_close(devc->usb->devhdl);
	173	devc->usb->devhdl = NULL;
	174	g_free(devc->config);
	175	sdi->status = SR_ST_INACTIVE;
	176
46697e38 BV	177
	178	return SR_OK;
	179	}
	180
	181	static int hw_cleanup(void)
	182	{
6aa1eb4e	183	struct drv_context *drvc;
46697e38	184
6aa1eb4e BV	185	if (!(drvc = di->priv))
	186	/* Can get called on an unused driver, doesn't matter. */
	187	return SR_OK;
	188
	189	clear_instances();
	190	g_free(drvc);
	191	di->priv = NULL;
46697e38 BV	192
	193	return SR_OK;
	194	}
	195
035a1078	196	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
46697e38	197	{
6aa1eb4e	198	struct dev_context *devc;
46697e38 BV	199	int ret;
46697e38 BV	200
6aa1eb4e BV	201	if (!di->priv) {
	202	sr_err("Driver was not initialized.");
	203	return SR_ERR;
	204	}
46697e38 BV	205	if (sdi->status != SR_ST_ACTIVE) {
	206	sr_err("Device inactive, can't set config options.");
	207	return SR_ERR;
	208	}
	209
6aa1eb4e	210	devc = sdi->priv;
46697e38	211	ret = SR_OK;
035a1078	212	switch (id) {
1953564a	213	case SR_CONF_LIMIT_SAMPLES:
6aa1eb4e BV	214	devc->limit_samples = (const uint64_t )value;
	215	sr_dbg("Setting sample limit to %" PRIu64 ".",
	216	devc->limit_samples);
	217	break;
46697e38	218	default:
035a1078	219	sr_err("Unknown hardware capability: %d.", id);
46697e38 BV	220	ret = SR_ERR_ARG;
	221	}
	222
	223	return ret;
	224	}
	225
a1c743fc BV	226	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	227	{
	228
	229	(void)sdi;
	230
	231	switch (key) {
0d485e30 BV	232	case SR_CONF_SCAN_OPTIONS:
	233	*data = hwopts;
	234	break;
9a6517d1 BV	235	case SR_CONF_DEVICE_OPTIONS:
	236	*data = hwcaps;
	237	break;
a1c743fc BV	238	default:
	239	return SR_ERR_ARG;
	240	}
	241
	242	return SR_OK;
	243	}
	244
6aa1eb4e BV	245	static void mark_xfer(struct libusb_transfer *xfer)
	246	{
	247
	248	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	249	xfer->user_data = GINT_TO_POINTER(1);
	250	else
	251	xfer->user_data = GINT_TO_POINTER(-1);
	252
	253	}
	254
	255	/* The Lascar software, in its infinite ignorance, reads a set of four
	256	* bytes from the device config struct and interprets it as a float.
	257	* That only works because they only use windows, and only on x86. However
	258	* we may be running on any architecture, any operating system. So we have
	259	* to convert these four bytes as the Lascar software would on windows/x86,
	260	* to the local representation of a float.
	261	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	262	static float binary32_le_to_float(unsigned char *buf)
	263	{
	264	GFloatIEEE754 f;
	265
	266	f.v_float = 0;
	267	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	268	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	269	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	270
	271	return f.v_float;
	272	}
	273
	274	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	275	{
	276	struct dev_context *devc;
	277	int ret;
	278
	279	devc = sdi->priv;
	280	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
	281	return SR_ERR;
	282
	283	ret = SR_OK;
	284	switch (devc->profile->logformat) {
	285	case LOG_TEMP_RH:
6787f404 BV	286	devc->sample_size = 2;
	287	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	288	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	289	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	290	/* Default to Celcius, we're all adults here. */
	291	devc->temp_unit = 0;
	292	} else
	293	sr_dbg("temperature unit is %s", devc->temp_unit
	294	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	295	break;
	296	case LOG_CO:
	297	devc->sample_size = 2;
6787f404 BV	298	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	299	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	300	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	301	devc->co_low);
	302	break;
	303	default:
	304	ret = SR_ERR_ARG;
	305	}
	306	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	307	sr_dbg("device log contains %d samples.", devc->logged_samples);
	308
	309	return ret;
	310	}
	311
46697e38	312	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	313	void *cb_data)
46697e38	314	{
6aa1eb4e	315	struct sr_datafeed_packet packet;
6aa1eb4e BV	316	struct dev_context *devc;
	317	struct drv_context *drvc = di->priv;
	318	struct libusb_transfer xfer_in, xfer_out;
	319	const struct libusb_pollfd **pfd;
	320	struct timeval tv;
	321	int ret, i;
	322	unsigned char cmd[3], resp[4], *buf;
	323
	324	if (!di->priv) {
	325	sr_err("Driver was not initialized.");
	326	return SR_ERR;
	327	}
	328
	329	devc = sdi->priv;
	330	devc->cb_data = cb_data;
	331
	332	if (lascar_proc_config(sdi) != SR_OK)
	333	return SR_ERR;
	334
	335	sr_dbg("Starting log retrieval.");
	336
	337	/* Send header packet to the session bus. */
4afdfd46	338	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
6aa1eb4e BV	339
	340	if (devc->logged_samples == 0) {
	341	/* This ensures the frontend knows the session is done. */
	342	packet.type = SR_DF_END;
	343	sr_session_send(devc->cb_data, &packet);
	344	return SR_OK;
	345	}
	346
	347	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	348	!(xfer_out = libusb_alloc_transfer(0)))
	349	return SR_ERR;
	350
	351	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	352	0x00, 0xffff, 0x00, NULL, 0, 50);
	353	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	354	0x02, 0x0002, 0x00, NULL, 0, 50);
	355	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	356	0x02, 0x0001, 0x00, NULL, 0, 50);
	357
	358
	359	/* Flush input. The F321 requires this. */
	360	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	361	256, &ret, 5) == 0 && ret > 0)
	362	;
	363
	364	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	365	resp, sizeof(resp), mark_xfer, 0, 10000);
	366	if (libusb_submit_transfer(xfer_in) != 0) {
	367	libusb_free_transfer(xfer_in);
	368	libusb_free_transfer(xfer_out);
	369	return SR_ERR;
	370	}
	371
	372	cmd[0] = 0x03;
	373	cmd[1] = 0xff;
	374	cmd[2] = 0xff;
	375	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
	376	cmd, 3, mark_xfer, 0, 100);
	377	if (libusb_submit_transfer(xfer_out) != 0) {
	378	libusb_free_transfer(xfer_in);
	379	libusb_free_transfer(xfer_out);
	380	return SR_ERR;
	381	}
	382
	383	tv.tv_sec = 0;
	384	tv.tv_usec = 0;
	385	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	386	g_usleep(5000);
	387	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	388	}
	389	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	390	xfer_in->user_data != GINT_TO_POINTER(1)) {
	391	sr_dbg("no response to log transfer request");
	392	libusb_free_transfer(xfer_in);
	393	libusb_free_transfer(xfer_out);
	394	return SR_ERR;
	395	}
	396	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	397	sr_dbg("invalid response to log transfer request");
	398	libusb_free_transfer(xfer_in);
	399	libusb_free_transfer(xfer_out);
	400	return SR_ERR;
	401	}
	402	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
403	libusb_free_transfer(xfer_out);
404
6aa1eb4e BV	405	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	406	for (i = 0; pfd[i]; i++) {
	407	/* Handle USB events every 100ms, for decent latency. */
	408	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	409	lascar_el_usb_handle_events, (void *)sdi);
	410	/* We'll need to remove this fd later. */
	411	devc->usbfd[i] = pfd[i]->fd;
	412	}
	413	devc->usbfd[i] = -1;
	414
	415	buf = g_try_malloc(4096);
	416	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	417	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	418	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	419	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	420	libusb_free_transfer(xfer_in);
	421	g_free(buf);
	422	return SR_ERR;
	423	}
46697e38 BV	424
	425	return SR_OK;
	426	}
	427
6aa1eb4e	428	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	429	{
	430	(void)cb_data;
	431
6aa1eb4e BV	432	if (!di->priv) {
	433	sr_err("Driver was not initialized.");
	434	return SR_ERR;
	435	}
	436
46697e38 BV	437	if (sdi->status != SR_ST_ACTIVE) {
	438	sr_err("Device inactive, can't stop acquisition.");
	439	return SR_ERR;
	440	}
	441
6aa1eb4e BV	442	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	443	/* TODO: free ongoing transfers? */
46697e38 BV	444
	445	return SR_OK;
	446	}
	447
	448	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	449	.name = "lascar-el-usb",
	450	.longname = "Lascar EL-USB",
	451	.api_version = 1,
	452	.init = hw_init,
	453	.cleanup = hw_cleanup,
	454	.scan = hw_scan,
	455	.dev_list = hw_dev_list,
	456	.dev_clear = clear_instances,
6fab7b8f	457	.config_get = NULL,
035a1078	458	.config_set = config_set,
a1c743fc	459	.config_list = config_list,
46697e38 BV	460	.dev_open = hw_dev_open,
46697e38 BV	461	.dev_close = hw_dev_close,
46697e38 BV	462	.dev_acquisition_start = hw_dev_acquisition_start,
	463	.dev_acquisition_stop = hw_dev_acquisition_stop,
	464	.priv = NULL,
	465	};