[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_DATALOG,
	SR_CONF_LIMIT_SAMPLES,
	0
};

/* Terrible hack */
static int BOOL_TRUE = TRUE;
static int BOOL_FALSE = FALSE;

/* 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;
	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, const void **data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	devc = sdi->priv;
	switch (id) {
	case SR_CONF_DATALOG:
		if (!sdi)
			return SR_ERR_ARG;
		if ((ret = lascar_is_logging(sdi)) == -1)
			return SR_ERR;
		*data = ret ? &BOOL_TRUE : &BOOL_FALSE;
		break;
	case SR_CONF_LIMIT_SAMPLES:
		*data = &devc->limit_samples;
		break;
	default:
		return SR_ERR_ARG;
	}

	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_DATALOG:
		if (*(int *)value) {
			/* Start logging. */
			ret = lascar_start_logging(sdi);
		} else {
			/* Stop logging. */
			ret = lascar_stop_logging(sdi);
		}
		break;
	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 dummy, ret;

	devc = sdi->priv;
	if (lascar_get_config(devc->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 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 = 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 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,
1953564a BV	38	SR_CONF_HYGROMETER,
361d1511	39	SR_CONF_DATALOG,
1953564a	40	SR_CONF_LIMIT_SAMPLES,
851d5b22 BV	41	0
	42	};
	43
361d1511 BV	44	/* Terrible hack */
	45	static int BOOL_TRUE = TRUE;
	46	static int BOOL_FALSE = FALSE;
	47
46697e38 BV	48	/* Properly close and free all devices. */
	49	static int clear_instances(void)
	50	{
	51	struct sr_dev_inst *sdi;
	52	struct drv_context *drvc;
	53	struct dev_context *devc;
	54	GSList *l;
	55
	56	if (!(drvc = di->priv))
	57	return SR_OK;
	58
	59	for (l = drvc->instances; l; l = l->next) {
	60	if (!(sdi = l->data))
	61	continue;
	62	if (!(devc = sdi->priv))
	63	continue;
	64
851d5b22 BV	65	hw_dev_close(sdi);
851d5b22 BV	66	sr_usb_dev_inst_free(devc->usb);
46697e38 BV	67	sr_dev_inst_free(sdi);
	68	}
	69
	70	g_slist_free(drvc->instances);
	71	drvc->instances = NULL;
	72
	73	return SR_OK;
	74	}
	75
851d5b22	76	static int hw_init(struct sr_context *sr_ctx)
46697e38	77	{
063e7aef	78	return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
46697e38 BV	79	}
	80
	81	static GSList hw_scan(GSList options)
	82	{
	83	struct drv_context *drvc;
851d5b22 BV	84	struct dev_context *devc;
	85	struct sr_dev_inst *sdi;
	86	struct sr_usb_dev_inst *usb;
1987b8d6	87	struct sr_config *src;
851d5b22 BV	88	GSList usb_devices, devices, *l;
851d5b22 BV	89	const char *conn;
46697e38 BV	90
	91	(void)options;
	92
4b97c74e	93	drvc = di->priv;
46697e38	94
851d5b22 BV	95	/* USB scan is always authoritative. */
	96	clear_instances();
	97
	98	conn = NULL;
	99	for (l = options; l; l = l->next) {
1987b8d6 BV	100	src = l->data;
1987b8d6 BV	101	switch (src->key) {
1953564a	102	case SR_CONF_CONN:
1987b8d6	103	conn = src->value;
851d5b22 BV	104	break;
	105	}
	106	}
	107	if (!conn)
	108	return NULL;
	109
	110	devices = NULL;
	111	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	112	/* We have a list of sr_usb_dev_inst matching the connection
	113	* string. Wrap them in sr_dev_inst and we're done. */
	114	for (l = usb_devices; l; l = l->next) {
	115	usb = l->data;
	116	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	117	/* Not a Lascar EL-USB. */
	118	g_free(usb);
	119	continue;
	120	}
6aa1eb4e	121	devc = sdi->priv;
851d5b22	122	devc->usb = usb;
851d5b22 BV	123	drvc->instances = g_slist_append(drvc->instances, sdi);
	124	devices = g_slist_append(devices, sdi);
	125	}
	126	g_slist_free(usb_devices);
	127	} else
	128	g_slist_free_full(usb_devices, g_free);
46697e38 BV	129
	130	return devices;
	131	}
	132
	133	static GSList *hw_dev_list(void)
	134	{
0e94d524	135	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	136	}
	137
	138	static int hw_dev_open(struct sr_dev_inst *sdi)
	139	{
6aa1eb4e BV	140	struct drv_context *drvc;
	141	struct dev_context *devc;
	142	int ret;
46697e38	143
6aa1eb4e BV	144	if (!(drvc = di->priv)) {
	145	sr_err("Driver was not initialized.");
	146	return SR_ERR;
	147	}
	148
	149	devc = sdi->priv;
	150	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	151	return SR_ERR;
	152
	153	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	154	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	155	return SR_ERR;
	156	}
	157	sdi->status = SR_ST_ACTIVE;
	158
	159	return ret;
46697e38 BV	160	}
	161
	162	static int hw_dev_close(struct sr_dev_inst *sdi)
	163	{
6aa1eb4e BV	164	struct dev_context *devc;
	165
	166	if (!di->priv) {
	167	sr_err("Driver was not initialized.");
	168	return SR_ERR;
	169	}
	170
	171	devc = sdi->priv;
	172	if (!devc->usb->devhdl)
	173	/* Nothing to do. */
	174	return SR_OK;
	175
	176	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	177	libusb_close(devc->usb->devhdl);
	178	devc->usb->devhdl = NULL;
6aa1eb4e BV	179	sdi->status = SR_ST_INACTIVE;
6aa1eb4e BV	180
46697e38 BV	181
	182	return SR_OK;
	183	}
	184
	185	static int hw_cleanup(void)
	186	{
6aa1eb4e	187	struct drv_context *drvc;
46697e38	188
6aa1eb4e BV	189	if (!(drvc = di->priv))
	190	/* Can get called on an unused driver, doesn't matter. */
	191	return SR_OK;
	192
	193	clear_instances();
	194	g_free(drvc);
	195	di->priv = NULL;
46697e38 BV	196
	197	return SR_OK;
	198	}
	199
361d1511 BV	200	static int config_get(int id, const void *data, const struct sr_dev_inst sdi)
	201	{
	202	struct dev_context *devc;
	203	int ret;
	204
	205	devc = sdi->priv;
	206	switch (id) {
	207	case SR_CONF_DATALOG:
	208	if (!sdi)
	209	return SR_ERR_ARG;
	210	if ((ret = lascar_is_logging(sdi)) == -1)
	211	return SR_ERR;
	212	*data = ret ? &BOOL_TRUE : &BOOL_FALSE;
	213	break;
	214	case SR_CONF_LIMIT_SAMPLES:
	215	*data = &devc->limit_samples;
	216	break;
	217	default:
	218	return SR_ERR_ARG;
	219	}
	220
	221	return SR_OK;
	222	}
	223
035a1078	224	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
46697e38	225	{
6aa1eb4e	226	struct dev_context *devc;
46697e38 BV	227	int ret;
46697e38 BV	228
6aa1eb4e BV	229	if (!di->priv) {
	230	sr_err("Driver was not initialized.");
	231	return SR_ERR;
	232	}
46697e38 BV	233	if (sdi->status != SR_ST_ACTIVE) {
	234	sr_err("Device inactive, can't set config options.");
	235	return SR_ERR;
	236	}
	237
6aa1eb4e	238	devc = sdi->priv;
46697e38	239	ret = SR_OK;
035a1078	240	switch (id) {
361d1511 BV	241	case SR_CONF_DATALOG:
	242	if ((int )value) {
	243	/* Start logging. */
	244	ret = lascar_start_logging(sdi);
	245	} else {
	246	/* Stop logging. */
	247	ret = lascar_stop_logging(sdi);
	248	}
	249	break;
1953564a	250	case SR_CONF_LIMIT_SAMPLES:
6aa1eb4e BV	251	devc->limit_samples = (const uint64_t )value;
	252	sr_dbg("Setting sample limit to %" PRIu64 ".",
	253	devc->limit_samples);
	254	break;
46697e38	255	default:
035a1078	256	sr_err("Unknown hardware capability: %d.", id);
46697e38 BV	257	ret = SR_ERR_ARG;
	258	}
	259
	260	return ret;
	261	}
	262
a1c743fc BV	263	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	264	{
	265
	266	(void)sdi;
	267
	268	switch (key) {
0d485e30 BV	269	case SR_CONF_SCAN_OPTIONS:
	270	*data = hwopts;
	271	break;
9a6517d1 BV	272	case SR_CONF_DEVICE_OPTIONS:
	273	*data = hwcaps;
	274	break;
a1c743fc BV	275	default:
	276	return SR_ERR_ARG;
	277	}
	278
	279	return SR_OK;
	280	}
	281
6aa1eb4e BV	282	static void mark_xfer(struct libusb_transfer *xfer)
	283	{
	284
	285	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	286	xfer->user_data = GINT_TO_POINTER(1);
	287	else
	288	xfer->user_data = GINT_TO_POINTER(-1);
	289
	290	}
	291
	292	/* The Lascar software, in its infinite ignorance, reads a set of four
	293	* bytes from the device config struct and interprets it as a float.
	294	* That only works because they only use windows, and only on x86. However
	295	* we may be running on any architecture, any operating system. So we have
	296	* to convert these four bytes as the Lascar software would on windows/x86,
	297	* to the local representation of a float.
	298	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	299	static float binary32_le_to_float(unsigned char *buf)
	300	{
	301	GFloatIEEE754 f;
	302
	303	f.v_float = 0;
	304	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	305	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	306	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	307
	308	return f.v_float;
	309	}
	310
	311	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	312	{
	313	struct dev_context *devc;
361d1511	314	int dummy, ret;
6aa1eb4e BV	315
6aa1eb4e BV	316	devc = sdi->priv;
361d1511	317	if (lascar_get_config(devc->usb->devhdl, devc->config, &dummy) != SR_OK)
6aa1eb4e BV	318	return SR_ERR;
	319
	320	ret = SR_OK;
	321	switch (devc->profile->logformat) {
	322	case LOG_TEMP_RH:
6787f404 BV	323	devc->sample_size = 2;
	324	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	325	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	326	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	327	/* Default to Celcius, we're all adults here. */
	328	devc->temp_unit = 0;
	329	} else
	330	sr_dbg("temperature unit is %s", devc->temp_unit
	331	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	332	break;
	333	case LOG_CO:
	334	devc->sample_size = 2;
6787f404 BV	335	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	336	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	337	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	338	devc->co_low);
	339	break;
	340	default:
	341	ret = SR_ERR_ARG;
	342	}
	343	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	344	sr_dbg("device log contains %d samples.", devc->logged_samples);
	345
	346	return ret;
	347	}
	348
46697e38	349	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	350	void *cb_data)
46697e38	351	{
6aa1eb4e	352	struct sr_datafeed_packet packet;
6aa1eb4e BV	353	struct dev_context *devc;
	354	struct drv_context *drvc = di->priv;
	355	struct libusb_transfer xfer_in, xfer_out;
	356	const struct libusb_pollfd **pfd;
	357	struct timeval tv;
	358	int ret, i;
	359	unsigned char cmd[3], resp[4], *buf;
	360
	361	if (!di->priv) {
	362	sr_err("Driver was not initialized.");
	363	return SR_ERR;
	364	}
	365
	366	devc = sdi->priv;
	367	devc->cb_data = cb_data;
	368
	369	if (lascar_proc_config(sdi) != SR_OK)
	370	return SR_ERR;
	371
	372	sr_dbg("Starting log retrieval.");
	373
	374	/* Send header packet to the session bus. */
4afdfd46	375	std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
6aa1eb4e BV	376
	377	if (devc->logged_samples == 0) {
	378	/* This ensures the frontend knows the session is done. */
	379	packet.type = SR_DF_END;
	380	sr_session_send(devc->cb_data, &packet);
	381	return SR_OK;
	382	}
	383
	384	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	385	!(xfer_out = libusb_alloc_transfer(0)))
	386	return SR_ERR;
	387
	388	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	389	0x00, 0xffff, 0x00, NULL, 0, 50);
	390	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	391	0x02, 0x0002, 0x00, NULL, 0, 50);
	392	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	393	0x02, 0x0001, 0x00, NULL, 0, 50);
	394
	395
	396	/* Flush input. The F321 requires this. */
	397	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	398	256, &ret, 5) == 0 && ret > 0)
	399	;
	400
	401	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	402	resp, sizeof(resp), mark_xfer, 0, 10000);
	403	if (libusb_submit_transfer(xfer_in) != 0) {
	404	libusb_free_transfer(xfer_in);
	405	libusb_free_transfer(xfer_out);
	406	return SR_ERR;
	407	}
	408
	409	cmd[0] = 0x03;
	410	cmd[1] = 0xff;
	411	cmd[2] = 0xff;
	412	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
	413	cmd, 3, mark_xfer, 0, 100);
	414	if (libusb_submit_transfer(xfer_out) != 0) {
	415	libusb_free_transfer(xfer_in);
	416	libusb_free_transfer(xfer_out);
	417	return SR_ERR;
	418	}
	419
	420	tv.tv_sec = 0;
	421	tv.tv_usec = 0;
	422	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	423	g_usleep(5000);
	424	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	425	}
	426	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	427	xfer_in->user_data != GINT_TO_POINTER(1)) {
	428	sr_dbg("no response to log transfer request");
	429	libusb_free_transfer(xfer_in);
	430	libusb_free_transfer(xfer_out);
	431	return SR_ERR;
	432	}
	433	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	434	sr_dbg("invalid response to log transfer request");
	435	libusb_free_transfer(xfer_in);
	436	libusb_free_transfer(xfer_out);
	437	return SR_ERR;
	438	}
	439	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
440	libusb_free_transfer(xfer_out);
441
6aa1eb4e BV	442	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	443	for (i = 0; pfd[i]; i++) {
	444	/* Handle USB events every 100ms, for decent latency. */
	445	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	446	lascar_el_usb_handle_events, (void *)sdi);
	447	/* We'll need to remove this fd later. */
	448	devc->usbfd[i] = pfd[i]->fd;
	449	}
	450	devc->usbfd[i] = -1;
	451
	452	buf = g_try_malloc(4096);
	453	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	454	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	455	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	456	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	457	libusb_free_transfer(xfer_in);
	458	g_free(buf);
	459	return SR_ERR;
	460	}
46697e38 BV	461
	462	return SR_OK;
	463	}
	464
6aa1eb4e	465	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	466	{
	467	(void)cb_data;
	468
6aa1eb4e BV	469	if (!di->priv) {
	470	sr_err("Driver was not initialized.");
	471	return SR_ERR;
	472	}
	473
46697e38 BV	474	if (sdi->status != SR_ST_ACTIVE) {
	475	sr_err("Device inactive, can't stop acquisition.");
	476	return SR_ERR;
	477	}
	478
6aa1eb4e BV	479	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	480	/* TODO: free ongoing transfers? */
46697e38 BV	481
	482	return SR_OK;
	483	}
	484
	485	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	486	.name = "lascar-el-usb",
	487	.longname = "Lascar EL-USB",
	488	.api_version = 1,
	489	.init = hw_init,
	490	.cleanup = hw_cleanup,
	491	.scan = hw_scan,
	492	.dev_list = hw_dev_list,
	493	.dev_clear = clear_instances,
361d1511	494	.config_get = config_get,
035a1078	495	.config_set = config_set,
a1c743fc	496	.config_list = config_list,
46697e38 BV	497	.dev_open = hw_dev_open,
46697e38 BV	498	.dev_close = hw_dev_close,
46697e38 BV	499	.dev_acquisition_start = hw_dev_acquisition_start,
	500	.dev_acquisition_stop = hw_dev_acquisition_stop,
	501	.priv = NULL,
	502	};