[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;

	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)
{
	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 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 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,
	.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 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
4b97c74e	98	drvc = di->priv;
46697e38	99
851d5b22 BV	100	/* USB scan is always authoritative. */
	101	clear_instances();
	102
	103	conn = NULL;
	104	for (l = options; l; l = l->next) {
1987b8d6 BV	105	src = l->data;
1987b8d6 BV	106	switch (src->key) {
1953564a	107	case SR_CONF_CONN:
1987b8d6	108	conn = src->value;
851d5b22 BV	109	break;
	110	}
	111	}
	112	if (!conn)
	113	return NULL;
	114
	115	devices = NULL;
	116	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	117	/* We have a list of sr_usb_dev_inst matching the connection
	118	* string. Wrap them in sr_dev_inst and we're done. */
	119	for (l = usb_devices; l; l = l->next) {
	120	usb = l->data;
	121	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	122	/* Not a Lascar EL-USB. */
	123	g_free(usb);
	124	continue;
	125	}
6aa1eb4e	126	devc = sdi->priv;
851d5b22	127	devc->usb = usb;
851d5b22 BV	128	drvc->instances = g_slist_append(drvc->instances, sdi);
	129	devices = g_slist_append(devices, sdi);
	130	}
	131	g_slist_free(usb_devices);
	132	} else
	133	g_slist_free_full(usb_devices, g_free);
46697e38 BV	134
	135	return devices;
	136	}
	137
	138	static GSList *hw_dev_list(void)
	139	{
	140	struct drv_context *drvc;
	141
6aa1eb4e BV	142	if (!(drvc = di->priv)) {
	143	sr_err("Driver was not initialized.");
	144	return NULL;
	145	}
46697e38 BV	146
	147	return drvc->instances;
	148	}
	149
	150	static int hw_dev_open(struct sr_dev_inst *sdi)
	151	{
6aa1eb4e BV	152	struct drv_context *drvc;
	153	struct dev_context *devc;
	154	int ret;
46697e38	155
6aa1eb4e BV	156	if (!(drvc = di->priv)) {
	157	sr_err("Driver was not initialized.");
	158	return SR_ERR;
	159	}
	160
	161	devc = sdi->priv;
	162	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	163	return SR_ERR;
	164
	165	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	166	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	167	return SR_ERR;
	168	}
	169	sdi->status = SR_ST_ACTIVE;
	170
	171	return ret;
46697e38 BV	172	}
	173
	174	static int hw_dev_close(struct sr_dev_inst *sdi)
	175	{
6aa1eb4e BV	176	struct dev_context *devc;
	177
	178	if (!di->priv) {
	179	sr_err("Driver was not initialized.");
	180	return SR_ERR;
	181	}
	182
	183	devc = sdi->priv;
	184	if (!devc->usb->devhdl)
	185	/* Nothing to do. */
	186	return SR_OK;
	187
	188	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	189	libusb_close(devc->usb->devhdl);
	190	devc->usb->devhdl = NULL;
	191	g_free(devc->config);
	192	sdi->status = SR_ST_INACTIVE;
	193
46697e38 BV	194
	195	return SR_OK;
	196	}
	197
	198	static int hw_cleanup(void)
	199	{
6aa1eb4e	200	struct drv_context *drvc;
46697e38	201
6aa1eb4e BV	202	if (!(drvc = di->priv))
	203	/* Can get called on an unused driver, doesn't matter. */
	204	return SR_OK;
	205
	206	clear_instances();
	207	g_free(drvc);
	208	di->priv = NULL;
46697e38 BV	209
	210	return SR_OK;
	211	}
	212
035a1078	213	static int config_set(int id, const void value, const struct sr_dev_inst sdi)
46697e38	214	{
6aa1eb4e	215	struct dev_context *devc;
46697e38 BV	216	int ret;
46697e38 BV	217
6aa1eb4e BV	218	if (!di->priv) {
	219	sr_err("Driver was not initialized.");
	220	return SR_ERR;
	221	}
46697e38 BV	222	if (sdi->status != SR_ST_ACTIVE) {
	223	sr_err("Device inactive, can't set config options.");
	224	return SR_ERR;
	225	}
	226
6aa1eb4e	227	devc = sdi->priv;
46697e38	228	ret = SR_OK;
035a1078	229	switch (id) {
1953564a	230	case SR_CONF_LIMIT_SAMPLES:
6aa1eb4e BV	231	devc->limit_samples = (const uint64_t )value;
	232	sr_dbg("Setting sample limit to %" PRIu64 ".",
	233	devc->limit_samples);
	234	break;
46697e38	235	default:
035a1078	236	sr_err("Unknown hardware capability: %d.", id);
46697e38 BV	237	ret = SR_ERR_ARG;
	238	}
	239
	240	return ret;
	241	}
	242
a1c743fc BV	243	static int config_list(int key, const void *data, const struct sr_dev_inst sdi)
	244	{
	245
	246	(void)sdi;
	247
	248	switch (key) {
0d485e30 BV	249	case SR_CONF_SCAN_OPTIONS:
	250	*data = hwopts;
	251	break;
9a6517d1 BV	252	case SR_CONF_DEVICE_OPTIONS:
	253	*data = hwcaps;
	254	break;
a1c743fc BV	255	default:
	256	return SR_ERR_ARG;
	257	}
	258
	259	return SR_OK;
	260	}
	261
6aa1eb4e BV	262	static void mark_xfer(struct libusb_transfer *xfer)
	263	{
	264
	265	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	266	xfer->user_data = GINT_TO_POINTER(1);
	267	else
	268	xfer->user_data = GINT_TO_POINTER(-1);
	269
	270	}
	271
	272	/* The Lascar software, in its infinite ignorance, reads a set of four
	273	* bytes from the device config struct and interprets it as a float.
	274	* That only works because they only use windows, and only on x86. However
	275	* we may be running on any architecture, any operating system. So we have
	276	* to convert these four bytes as the Lascar software would on windows/x86,
	277	* to the local representation of a float.
	278	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	279	static float binary32_le_to_float(unsigned char *buf)
	280	{
	281	GFloatIEEE754 f;
	282
	283	f.v_float = 0;
	284	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	285	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	286	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	287
	288	return f.v_float;
	289	}
	290
	291	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	292	{
	293	struct dev_context *devc;
	294	int ret;
	295
	296	devc = sdi->priv;
	297	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
	298	return SR_ERR;
	299
	300	ret = SR_OK;
	301	switch (devc->profile->logformat) {
	302	case LOG_TEMP_RH:
6787f404 BV	303	devc->sample_size = 2;
	304	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	305	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	306	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	307	/* Default to Celcius, we're all adults here. */
	308	devc->temp_unit = 0;
	309	} else
	310	sr_dbg("temperature unit is %s", devc->temp_unit
	311	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	312	break;
	313	case LOG_CO:
	314	devc->sample_size = 2;
6787f404 BV	315	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	316	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	317	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	318	devc->co_low);
	319	break;
	320	default:
	321	ret = SR_ERR_ARG;
	322	}
	323	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	324	sr_dbg("device log contains %d samples.", devc->logged_samples);
	325
	326	return ret;
	327	}
	328
46697e38	329	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	330	void *cb_data)
46697e38	331	{
6aa1eb4e BV	332	struct sr_datafeed_packet packet;
6aa1eb4e BV	333	struct sr_datafeed_header header;
6aa1eb4e BV	334	struct dev_context *devc;
	335	struct drv_context *drvc = di->priv;
	336	struct libusb_transfer xfer_in, xfer_out;
	337	const struct libusb_pollfd **pfd;
	338	struct timeval tv;
	339	int ret, i;
	340	unsigned char cmd[3], resp[4], *buf;
	341
	342	if (!di->priv) {
	343	sr_err("Driver was not initialized.");
	344	return SR_ERR;
	345	}
	346
	347	devc = sdi->priv;
	348	devc->cb_data = cb_data;
	349
	350	if (lascar_proc_config(sdi) != SR_OK)
	351	return SR_ERR;
	352
	353	sr_dbg("Starting log retrieval.");
	354
	355	/* Send header packet to the session bus. */
	356	sr_dbg("Sending SR_DF_HEADER.");
	357	packet.type = SR_DF_HEADER;
	358	packet.payload = (uint8_t *)&header;
	359	header.feed_version = 1;
	360	sr_session_send(devc->cb_data, &packet);
	361
	362	if (devc->logged_samples == 0) {
	363	/* This ensures the frontend knows the session is done. */
	364	packet.type = SR_DF_END;
	365	sr_session_send(devc->cb_data, &packet);
	366	return SR_OK;
	367	}
	368
	369	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	370	!(xfer_out = libusb_alloc_transfer(0)))
	371	return SR_ERR;
	372
	373	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	374	0x00, 0xffff, 0x00, NULL, 0, 50);
	375	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	376	0x02, 0x0002, 0x00, NULL, 0, 50);
	377	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	378	0x02, 0x0001, 0x00, NULL, 0, 50);
	379
	380
	381	/* Flush input. The F321 requires this. */
	382	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	383	256, &ret, 5) == 0 && ret > 0)
	384	;
	385
	386	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	387	resp, sizeof(resp), mark_xfer, 0, 10000);
	388	if (libusb_submit_transfer(xfer_in) != 0) {
	389	libusb_free_transfer(xfer_in);
	390	libusb_free_transfer(xfer_out);
	391	return SR_ERR;
	392	}
	393
	394	cmd[0] = 0x03;
	395	cmd[1] = 0xff;
	396	cmd[2] = 0xff;
	397	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
398	cmd, 3, mark_xfer, 0, 100);
399	if (libusb_submit_transfer(xfer_out) != 0) {
400	libusb_free_transfer(xfer_in);
401	libusb_free_transfer(xfer_out);
402	return SR_ERR;
403	}
404
405	tv.tv_sec = 0;
406	tv.tv_usec = 0;
407	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
408	g_usleep(5000);
409	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
410	}
411	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
412	xfer_in->user_data != GINT_TO_POINTER(1)) {
413	sr_dbg("no response to log transfer request");
414	libusb_free_transfer(xfer_in);
415	libusb_free_transfer(xfer_out);
416	return SR_ERR;
417	}
418	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
419	sr_dbg("invalid response to log transfer request");
420	libusb_free_transfer(xfer_in);
421	libusb_free_transfer(xfer_out);
422	return SR_ERR;
423	}
424	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
425	libusb_free_transfer(xfer_out);
426
6aa1eb4e BV	427	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	428	for (i = 0; pfd[i]; i++) {
	429	/* Handle USB events every 100ms, for decent latency. */
	430	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
	431	lascar_el_usb_handle_events, (void *)sdi);
	432	/* We'll need to remove this fd later. */
	433	devc->usbfd[i] = pfd[i]->fd;
	434	}
	435	devc->usbfd[i] = -1;
	436
	437	buf = g_try_malloc(4096);
	438	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	439	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	440	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	441	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	442	libusb_free_transfer(xfer_in);
	443	g_free(buf);
	444	return SR_ERR;
	445	}
46697e38 BV	446
	447	return SR_OK;
	448	}
	449
6aa1eb4e	450	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	451	{
	452	(void)cb_data;
	453
6aa1eb4e BV	454	if (!di->priv) {
	455	sr_err("Driver was not initialized.");
	456	return SR_ERR;
	457	}
	458
46697e38 BV	459	if (sdi->status != SR_ST_ACTIVE) {
	460	sr_err("Device inactive, can't stop acquisition.");
	461	return SR_ERR;
	462	}
	463
6aa1eb4e BV	464	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	465	/* TODO: free ongoing transfers? */
46697e38 BV	466
	467	return SR_OK;
	468	}
	469
	470	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	471	.name = "lascar-el-usb",
	472	.longname = "Lascar EL-USB",
	473	.api_version = 1,
	474	.init = hw_init,
	475	.cleanup = hw_cleanup,
	476	.scan = hw_scan,
	477	.dev_list = hw_dev_list,
	478	.dev_clear = clear_instances,
035a1078	479	.config_set = config_set,
a1c743fc	480	.config_list = config_list,
46697e38 BV	481	.dev_open = hw_dev_open,
46697e38 BV	482	.dev_close = hw_dev_close,
46697e38 BV	483	.dev_acquisition_start = hw_dev_acquisition_start,
	484	.dev_acquisition_stop = hw_dev_acquisition_stop,
	485	.priv = NULL,
	486	};