[libsigrok.git] / src / 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_driver lascar_el_usb_driver_info;

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
};

static const uint32_t devopts[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_HYGROMETER,
	SR_CONF_CONN | SR_CONF_GET,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_DATALOG | SR_CONF_GET | SR_CONF_SET,
};

static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

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

	drvc = di->priv;

	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		}
	}
	if (!conn)
		return NULL;

	devices = NULL;
	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
		/* We have a list of sr_usb_dev_inst matching the connection
		 * string. Wrap them in sr_dev_inst and we're done. */
		for (l = usb_devices; l; l = l->next) {
			usb = l->data;
			if (!(sdi = lascar_scan(usb->bus, usb->address))) {
				/* Not a Lascar EL-USB. */
				g_free(usb);
				continue;
			}
			sdi->inst_type = SR_INST_USB;
			sdi->conn = usb;
			drvc->instances = g_slist_append(drvc->instances, sdi);
			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return devices;
}

static GSList *dev_list(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	int ret;

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

	usb = sdi->conn;

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

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

	return ret;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct sr_usb_dev_inst *usb;

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

	usb = sdi->conn;

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

	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int cleanup(const struct sr_dev_driver *di)
{
	int ret;
	struct drv_context *drvc;

	if (!(drvc = di->priv))
		/* Can get called on an unused driver, doesn't matter. */
		return SR_OK;


	ret = std_dev_clear(di, NULL);
	g_free(drvc);

	return ret;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int ret;
	char str[128];

	(void)cg;

	devc = sdi->priv;
	switch (key) {
	case SR_CONF_CONN:
		if (!sdi || !sdi->conn)
			return SR_ERR_ARG;
		usb = sdi->conn;
		snprintf(str, 128, "%d.%d", usb->bus, usb->address);
		*data = g_variant_new_string(str);
		break;
	case SR_CONF_DATALOG:
		if (!sdi)
			return SR_ERR_ARG;
		if ((ret = lascar_is_logging(sdi)) == -1)
			return SR_ERR;
		*data = g_variant_new_boolean(ret ? TRUE : FALSE);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct sr_dev_driver *di = sdi->driver;
	struct dev_context *devc;
	int ret;

	(void)cg;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

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

	devc = sdi->priv;
	ret = SR_OK;
	switch (key) {
	case SR_CONF_DATALOG:
		if (g_variant_get_boolean(data)) {
			/* Start logging. */
			ret = lascar_start_logging(sdi);
		} else {
			/* Stop logging. */
			ret = lascar_stop_logging(sdi);
		}
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static void mark_xfer(struct libusb_transfer *xfer)
{

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

}

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

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

	return f.v_float;
}

static int lascar_proc_config(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int dummy, ret;

	devc = sdi->priv;
	usb = sdi->conn;

	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
		return SR_ERR;

	ret = SR_OK;
	switch (devc->profile->logformat) {
	case LOG_TEMP_RH:
		devc->sample_size = 2;
		devc->temp_unit = devc->config[0x2e] | (devc->config[0x2f] << 8);
		if (devc->temp_unit != 0 && devc->temp_unit != 1) {
			sr_dbg("invalid temperature unit %d", devc->temp_unit);
			/* Default to Celcius, we're all adults here. */
			devc->temp_unit = 0;
		} else
			sr_dbg("temperature unit is %s", devc->temp_unit
					? "Fahrenheit" : "Celcius");
		break;
	case LOG_CO:
		devc->sample_size = 2;
		devc->co_high = binary32_le_to_float(devc->config + 0x24);
		devc->co_low = binary32_le_to_float(devc->config + 0x28);
		sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
				devc->co_low);
		break;
	default:
		ret = SR_ERR_ARG;
	}
	devc->logged_samples = devc->config[0x1e] | (devc->config[0x1f] << 8);
	sr_dbg("device log contains %d samples.", devc->logged_samples);

	return ret;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_dev_driver *di = sdi->driver;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_config *src;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	struct libusb_transfer *xfer_in, *xfer_out;
	struct timeval tv;
	uint64_t interval;
	int ret;
	unsigned char cmd[3], resp[4], *buf;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

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

	drvc = di->priv;
	devc = sdi->priv;
	usb = sdi->conn;
	devc->cb_data = cb_data;

	if (lascar_proc_config(sdi) != SR_OK)
		return SR_ERR;

	sr_dbg("Starting log retrieval.");

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, LOG_PREFIX);

	interval = (devc->config[0x1c] | (devc->config[0x1d] << 8)) * 1000;
	packet.type = SR_DF_META;
	packet.payload = &meta;
	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
	meta.config = g_slist_append(NULL, src);
	sr_session_send(devc->cb_data, &packet);
	g_free(src);

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

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

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


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

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

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

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

	usb_source_add(sdi->session, drvc->sr_ctx, 100,
			lascar_el_usb_handle_events, (void *)sdi);

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

	return SR_OK;
}

SR_PRIV int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_dev_driver *di = sdi->driver;
	(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 = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = NULL,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = 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
	26	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
851d5b22	27
a0e0bb41	28	static const uint32_t scanopts[] = {
1953564a	29	SR_CONF_CONN,
851d5b22 BV	30	};
851d5b22 BV	31
f254bc4b	32	static const uint32_t devopts[] = {
1953564a BV	33	SR_CONF_THERMOMETER,
1953564a BV	34	SR_CONF_HYGROMETER,
5827f61b BV	35	SR_CONF_CONN \| SR_CONF_GET,
	36	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	37	SR_CONF_DATALOG \| SR_CONF_GET \| SR_CONF_SET,
851d5b22 BV	38	};
851d5b22 BV	39
4f840ce9	40	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
46697e38	41	{
f6beaac5	42	return std_init(sr_ctx, di, LOG_PREFIX);
46697e38 BV	43	}
46697e38 BV	44
4f840ce9	45	static GSList scan(struct sr_dev_driver di, GSList *options)
46697e38 BV	46	{
46697e38 BV	47	struct drv_context *drvc;
851d5b22 BV	48	struct sr_dev_inst *sdi;
851d5b22 BV	49	struct sr_usb_dev_inst *usb;
1987b8d6	50	struct sr_config *src;
851d5b22 BV	51	GSList usb_devices, devices, *l;
851d5b22 BV	52	const char *conn;
46697e38	53
4b97c74e	54	drvc = di->priv;
46697e38	55
851d5b22 BV	56	conn = NULL;
851d5b22 BV	57	for (l = options; l; l = l->next) {
1987b8d6 BV	58	src = l->data;
1987b8d6 BV	59	switch (src->key) {
1953564a	60	case SR_CONF_CONN:
7faf69da	61	conn = g_variant_get_string(src->data, NULL);
851d5b22 BV	62	break;
	63	}
	64	}
	65	if (!conn)
	66	return NULL;
	67
	68	devices = NULL;
	69	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	70	/* We have a list of sr_usb_dev_inst matching the connection
	71	* string. Wrap them in sr_dev_inst and we're done. */
	72	for (l = usb_devices; l; l = l->next) {
	73	usb = l->data;
	74	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	75	/* Not a Lascar EL-USB. */
	76	g_free(usb);
	77	continue;
	78	}
0f150649 BV	79	sdi->inst_type = SR_INST_USB;
0f150649 BV	80	sdi->conn = usb;
851d5b22 BV	81	drvc->instances = g_slist_append(drvc->instances, sdi);
	82	devices = g_slist_append(devices, sdi);
	83	}
	84	g_slist_free(usb_devices);
	85	} else
	86	g_slist_free_full(usb_devices, g_free);
46697e38 BV	87
	88	return devices;
	89	}
	90
4f840ce9	91	static GSList dev_list(const struct sr_dev_driver di)
46697e38	92	{
0e94d524	93	return ((struct drv_context *)(di->priv))->instances;
46697e38 BV	94	}
46697e38 BV	95
6078d2c9	96	static int dev_open(struct sr_dev_inst *sdi)
46697e38	97	{
4f840ce9	98	struct sr_dev_driver *di = sdi->driver;
6aa1eb4e	99	struct drv_context *drvc;
0f150649	100	struct sr_usb_dev_inst *usb;
6aa1eb4e	101	int ret;
46697e38	102
6aa1eb4e BV	103	if (!(drvc = di->priv)) {
	104	sr_err("Driver was not initialized.");
	105	return SR_ERR;
	106	}
	107
0f150649 BV	108	usb = sdi->conn;
	109
	110	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
6aa1eb4e BV	111	return SR_ERR;
6aa1eb4e BV	112
0f150649	113	if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) {
6aa1eb4e BV	114	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	115	return SR_ERR;
	116	}
	117	sdi->status = SR_ST_ACTIVE;
	118
	119	return ret;
46697e38 BV	120	}
46697e38 BV	121
6078d2c9	122	static int dev_close(struct sr_dev_inst *sdi)
46697e38	123	{
4f840ce9	124	struct sr_dev_driver *di = sdi->driver;
0f150649	125	struct sr_usb_dev_inst *usb;
6aa1eb4e BV	126
	127	if (!di->priv) {
	128	sr_err("Driver was not initialized.");
	129	return SR_ERR;
	130	}
	131
0f150649 BV	132	usb = sdi->conn;
	133
	134	if (!usb->devhdl)
6aa1eb4e BV	135	/* Nothing to do. */
	136	return SR_OK;
	137
0f150649 BV	138	libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
	139	libusb_close(usb->devhdl);
	140	usb->devhdl = NULL;
6aa1eb4e BV	141	sdi->status = SR_ST_INACTIVE;
6aa1eb4e BV	142
46697e38 BV	143	return SR_OK;
	144	}
	145
4f840ce9	146	static int cleanup(const struct sr_dev_driver *di)
46697e38	147	{
c9d622a4	148	int ret;
6aa1eb4e	149	struct drv_context *drvc;
46697e38	150
6aa1eb4e BV	151	if (!(drvc = di->priv))
	152	/* Can get called on an unused driver, doesn't matter. */
	153	return SR_OK;
	154
a6630742 BV	155
a6630742 BV	156	ret = std_dev_clear(di, NULL);
6aa1eb4e	157	g_free(drvc);
46697e38	158
c9d622a4	159	return ret;
46697e38 BV	160	}
46697e38 BV	161
584560f1	162	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	163	const struct sr_channel_group *cg)
361d1511 BV	164	{
361d1511 BV	165	struct dev_context *devc;
0f150649	166	struct sr_usb_dev_inst *usb;
361d1511	167	int ret;
0f150649	168	char str[128];
361d1511	169
53b4680f	170	(void)cg;
8f996b89	171
361d1511	172	devc = sdi->priv;
584560f1	173	switch (key) {
0f150649 BV	174	case SR_CONF_CONN:
	175	if (!sdi \|\| !sdi->conn)
	176	return SR_ERR_ARG;
	177	usb = sdi->conn;
	178	snprintf(str, 128, "%d.%d", usb->bus, usb->address);
	179	*data = g_variant_new_string(str);
	180	break;
361d1511 BV	181	case SR_CONF_DATALOG:
	182	if (!sdi)
	183	return SR_ERR_ARG;
	184	if ((ret = lascar_is_logging(sdi)) == -1)
	185	return SR_ERR;
7faf69da	186	*data = g_variant_new_boolean(ret ? TRUE : FALSE);
361d1511 BV	187	break;
361d1511 BV	188	case SR_CONF_LIMIT_SAMPLES:
7faf69da	189	*data = g_variant_new_uint64(devc->limit_samples);
361d1511 BV	190	break;
361d1511 BV	191	default:
bd6fbf62	192	return SR_ERR_NA;
361d1511 BV	193	}
	194
	195	return SR_OK;
	196	}
	197
584560f1	198	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	199	const struct sr_channel_group *cg)
46697e38	200	{
4f840ce9	201	struct sr_dev_driver *di = sdi->driver;
6aa1eb4e	202	struct dev_context *devc;
46697e38 BV	203	int ret;
46697e38 BV	204
53b4680f	205	(void)cg;
8f996b89	206
e73ffd42 BV	207	if (sdi->status != SR_ST_ACTIVE)
	208	return SR_ERR_DEV_CLOSED;
	209
6aa1eb4e BV	210	if (!di->priv) {
	211	sr_err("Driver was not initialized.");
	212	return SR_ERR;
	213	}
46697e38	214
6aa1eb4e	215	devc = sdi->priv;
46697e38	216	ret = SR_OK;
584560f1	217	switch (key) {
361d1511	218	case SR_CONF_DATALOG:
7faf69da	219	if (g_variant_get_boolean(data)) {
361d1511 BV	220	/* Start logging. */
	221	ret = lascar_start_logging(sdi);
	222	} else {
	223	/* Stop logging. */
	224	ret = lascar_stop_logging(sdi);
	225	}
	226	break;
1953564a	227	case SR_CONF_LIMIT_SAMPLES:
7faf69da	228	devc->limit_samples = g_variant_get_uint64(data);
6aa1eb4e BV	229	sr_dbg("Setting sample limit to %" PRIu64 ".",
	230	devc->limit_samples);
	231	break;
46697e38	232	default:
bd6fbf62	233	ret = SR_ERR_NA;
46697e38 BV	234	}
	235
	236	return ret;
	237	}
	238
584560f1	239	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	240	const struct sr_channel_group *cg)
a1c743fc	241	{
a1c743fc	242	(void)sdi;
53b4680f	243	(void)cg;
a1c743fc BV	244
a1c743fc BV	245	switch (key) {
0d485e30	246	case SR_CONF_SCAN_OPTIONS:
584560f1	247	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
a0e0bb41	248	scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
0d485e30	249	break;
9a6517d1	250	case SR_CONF_DEVICE_OPTIONS:
584560f1	251	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
f254bc4b	252	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
9a6517d1	253	break;
a1c743fc	254	default:
bd6fbf62	255	return SR_ERR_NA;
a1c743fc BV	256	}
	257
	258	return SR_OK;
	259	}
	260
6aa1eb4e BV	261	static void mark_xfer(struct libusb_transfer *xfer)
	262	{
	263
	264	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	265	xfer->user_data = GINT_TO_POINTER(1);
	266	else
	267	xfer->user_data = GINT_TO_POINTER(-1);
	268
	269	}
	270
	271	/* The Lascar software, in its infinite ignorance, reads a set of four
	272	* bytes from the device config struct and interprets it as a float.
	273	* That only works because they only use windows, and only on x86. However
	274	* we may be running on any architecture, any operating system. So we have
	275	* to convert these four bytes as the Lascar software would on windows/x86,
	276	* to the local representation of a float.
	277	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	278	static float binary32_le_to_float(unsigned char *buf)
	279	{
	280	GFloatIEEE754 f;
	281
	282	f.v_float = 0;
	283	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	284	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	285	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	286
	287	return f.v_float;
	288	}
	289
	290	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	291	{
	292	struct dev_context *devc;
0f150649	293	struct sr_usb_dev_inst *usb;
361d1511	294	int dummy, ret;
6aa1eb4e BV	295
6aa1eb4e BV	296	devc = sdi->priv;
0f150649 BV	297	usb = sdi->conn;
	298
	299	if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
6aa1eb4e BV	300	return SR_ERR;
	301
	302	ret = SR_OK;
	303	switch (devc->profile->logformat) {
	304	case LOG_TEMP_RH:
6787f404 BV	305	devc->sample_size = 2;
	306	devc->temp_unit = devc->config[0x2e] \| (devc->config[0x2f] << 8);
	307	if (devc->temp_unit != 0 && devc->temp_unit != 1) {
	308	sr_dbg("invalid temperature unit %d", devc->temp_unit);
	309	/* Default to Celcius, we're all adults here. */
	310	devc->temp_unit = 0;
	311	} else
	312	sr_dbg("temperature unit is %s", devc->temp_unit
	313	? "Fahrenheit" : "Celcius");
6aa1eb4e BV	314	break;
	315	case LOG_CO:
	316	devc->sample_size = 2;
6787f404 BV	317	devc->co_high = binary32_le_to_float(devc->config + 0x24);
6787f404 BV	318	devc->co_low = binary32_le_to_float(devc->config + 0x28);
6aa1eb4e BV	319	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	320	devc->co_low);
	321	break;
	322	default:
	323	ret = SR_ERR_ARG;
	324	}
	325	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	326	sr_dbg("device log contains %d samples.", devc->logged_samples);
	327
	328	return ret;
	329	}
	330
6078d2c9	331	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
46697e38	332	{
4f840ce9	333	struct sr_dev_driver *di = sdi->driver;
6aa1eb4e	334	struct sr_datafeed_packet packet;
8e77bc20 BV	335	struct sr_datafeed_meta meta;
8e77bc20 BV	336	struct sr_config *src;
6aa1eb4e	337	struct dev_context *devc;
8e77bc20	338	struct drv_context *drvc;
0f150649	339	struct sr_usb_dev_inst *usb;
6aa1eb4e	340	struct libusb_transfer xfer_in, xfer_out;
6aa1eb4e	341	struct timeval tv;
8e77bc20	342	uint64_t interval;
6c60facc	343	int ret;
6aa1eb4e BV	344	unsigned char cmd[3], resp[4], *buf;
6aa1eb4e BV	345
e73ffd42 BV	346	if (sdi->status != SR_ST_ACTIVE)
	347	return SR_ERR_DEV_CLOSED;
	348
6aa1eb4e BV	349	if (!di->priv) {
	350	sr_err("Driver was not initialized.");
	351	return SR_ERR;
	352	}
	353
8e77bc20	354	drvc = di->priv;
6aa1eb4e	355	devc = sdi->priv;
0f150649	356	usb = sdi->conn;
6aa1eb4e BV	357	devc->cb_data = cb_data;
	358
	359	if (lascar_proc_config(sdi) != SR_OK)
	360	return SR_ERR;
	361
	362	sr_dbg("Starting log retrieval.");
	363
	364	/* Send header packet to the session bus. */
29a27196	365	std_session_send_df_header(cb_data, LOG_PREFIX);
6aa1eb4e	366
8e77bc20 BV	367	interval = (devc->config[0x1c] \| (devc->config[0x1d] << 8)) * 1000;
	368	packet.type = SR_DF_META;
	369	packet.payload = &meta;
7faf69da	370	src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
8e77bc20 BV	371	meta.config = g_slist_append(NULL, src);
	372	sr_session_send(devc->cb_data, &packet);
	373	g_free(src);
	374
6aa1eb4e BV	375	if (devc->logged_samples == 0) {
	376	/* This ensures the frontend knows the session is done. */
	377	packet.type = SR_DF_END;
	378	sr_session_send(devc->cb_data, &packet);
	379	return SR_OK;
	380	}
	381
	382	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	383	!(xfer_out = libusb_alloc_transfer(0)))
	384	return SR_ERR;
	385
0f150649	386	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	387	0x00, 0xffff, 0x00, NULL, 0, 50);
0f150649	388	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e	389	0x02, 0x0002, 0x00, NULL, 0, 50);
0f150649	390	libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
6aa1eb4e BV	391	0x02, 0x0001, 0x00, NULL, 0, 50);
	392
	393
	394	/* Flush input. The F321 requires this. */
0f150649	395	while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
6aa1eb4e BV	396	256, &ret, 5) == 0 && ret > 0)
	397	;
	398
0f150649	399	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	400	resp, sizeof(resp), mark_xfer, 0, 10000);
	401	if (libusb_submit_transfer(xfer_in) != 0) {
	402	libusb_free_transfer(xfer_in);
	403	libusb_free_transfer(xfer_out);
	404	return SR_ERR;
	405	}
	406
	407	cmd[0] = 0x03;
	408	cmd[1] = 0xff;
	409	cmd[2] = 0xff;
0f150649	410	libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT,
6aa1eb4e BV	411	cmd, 3, mark_xfer, 0, 100);
	412	if (libusb_submit_transfer(xfer_out) != 0) {
	413	libusb_free_transfer(xfer_in);
	414	libusb_free_transfer(xfer_out);
	415	return SR_ERR;
	416	}
	417
	418	tv.tv_sec = 0;
	419	tv.tv_usec = 0;
	420	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	421	g_usleep(5000);
	422	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	423	}
	424	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
	425	xfer_in->user_data != GINT_TO_POINTER(1)) {
	426	sr_dbg("no response to log transfer request");
	427	libusb_free_transfer(xfer_in);
	428	libusb_free_transfer(xfer_out);
	429	return SR_ERR;
	430	}
	431	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
	432	sr_dbg("invalid response to log transfer request");
	433	libusb_free_transfer(xfer_in);
	434	libusb_free_transfer(xfer_out);
	435	return SR_ERR;
	436	}
	437	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
	438	libusb_free_transfer(xfer_out);
	439
102f1239 BV	440	usb_source_add(sdi->session, drvc->sr_ctx, 100,
102f1239 BV	441	lascar_el_usb_handle_events, (void *)sdi);
6aa1eb4e BV	442
6aa1eb4e BV	443	buf = g_try_malloc(4096);
0f150649	444	libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN,
6aa1eb4e BV	445	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
	446	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
	447	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
	448	libusb_free_transfer(xfer_in);
	449	g_free(buf);
	450	return SR_ERR;
	451	}
46697e38 BV	452
	453	return SR_OK;
	454	}
	455
6078d2c9	456	SR_PRIV int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38	457	{
4f840ce9	458	struct sr_dev_driver *di = sdi->driver;
46697e38 BV	459	(void)cb_data;
46697e38 BV	460
6aa1eb4e BV	461	if (!di->priv) {
	462	sr_err("Driver was not initialized.");
	463	return SR_ERR;
	464	}
	465
46697e38 BV	466	if (sdi->status != SR_ST_ACTIVE) {
	467	sr_err("Device inactive, can't stop acquisition.");
	468	return SR_ERR;
	469	}
	470
6aa1eb4e BV	471	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	472	/* TODO: free ongoing transfers? */
46697e38 BV	473
	474	return SR_OK;
	475	}
	476
	477	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	478	.name = "lascar-el-usb",
	479	.longname = "Lascar EL-USB",
	480	.api_version = 1,
6078d2c9 UH	481	.init = init,
	482	.cleanup = cleanup,
	483	.scan = scan,
	484	.dev_list = dev_list,
a6630742	485	.dev_clear = NULL,
361d1511	486	.config_get = config_get,
035a1078	487	.config_set = config_set,
a1c743fc	488	.config_list = config_list,
6078d2c9 UH	489	.dev_open = dev_open,
	490	.dev_close = dev_close,
	491	.dev_acquisition_start = dev_acquisition_start,
	492	.dev_acquisition_stop = dev_acquisition_stop,
46697e38 BV	493	.priv = NULL,
46697e38 BV	494	};