[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_HWOPT_CONN,
	0,
};

static const int hwcaps[] = {
	SR_HWCAP_THERMOMETER,
	SR_HWCAP_HYGROMETER,
	SR_HWCAP_LIMIT_SAMPLES,
	0
};

static const char *probe_names[] = {
	"P1",
};


/* 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_hwopt *opt;
	GSList *usb_devices, *devices, *l;
	const char *conn;

	(void)options;

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

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

	conn = NULL;
	for (l = options; l; l = l->next) {
		opt = l->data;
		switch (opt->hwopt) {
		case SR_HWOPT_CONN:
			conn = opt->value;
			break;
		}
	}
	if (!conn)
		return NULL;

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

	return devices;
}

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

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

	return drvc->instances;
}

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

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

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

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

	return ret;
}

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

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

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

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


	return SR_OK;
}

static int hw_cleanup(void)
{
	struct drv_context *drvc;

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

	clear_instances();
	g_free(drvc);
	di->priv = NULL;

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
		const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (info_id) {
	case SR_DI_HWOPTS:
		*data = hwopts;
		break;
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(1);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	default:
		sr_err("Unknown info_id: %d.", info_id);
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value)
{
	struct dev_context *devc;
	int ret;

	if (!di->priv) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}
	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("Device inactive, can't set config options.");
		return SR_ERR;
	}

	devc = sdi->priv;
	ret = SR_OK;
	switch (hwcap) {
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown hardware capability: %d.", hwcap);
		ret = SR_ERR_ARG;
	}

	return ret;
}

static void mark_xfer(struct libusb_transfer *xfer)
{

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

}

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

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

	return f.v_float;
}

static int lascar_proc_config(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;

	devc = sdi->priv;
	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
		return SR_ERR;

	ret = SR_OK;
	switch (devc->profile->logformat) {
	case LOG_TEMP_RH:
		/* TODO */
		break;
	case LOG_CO:
		devc->sample_size = 2;
		devc->co_high = binary32_le_to_float(devc->config + 36);
		devc->co_low = binary32_le_to_float(devc->config + 40);
		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 sr_datafeed_meta_analog meta;
	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);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 1;
	sr_session_send(devc->cb_data, &packet);

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

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

	return SR_OK;
}

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

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

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

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

	return SR_OK;
}

SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	.name = "lascar-el-usb",
	.longname = "Lascar EL-USB",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
46697e38 BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <glib.h>
851d5b22	21	#include <libusb.h>
46697e38 BV	22	#include "libsigrok.h"
	23	#include "libsigrok-internal.h"
	24	#include "protocol.h"
	25
851d5b22	26	SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address);
46697e38 BV	27	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
46697e38 BV	28	static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
851d5b22	29	static int hw_dev_close(struct sr_dev_inst *sdi);
851d5b22 BV	30
	31	static const int hwopts[] = {
	32	SR_HWOPT_CONN,
	33	0,
	34	};
	35
	36	static const int hwcaps[] = {
	37	SR_HWCAP_THERMOMETER,
	38	SR_HWCAP_HYGROMETER,
	39	SR_HWCAP_LIMIT_SAMPLES,
	40	0
	41	};
	42
	43	static const char *probe_names[] = {
	44	"P1",
	45	};
	46
46697e38 BV	47
	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 BV	77	{
	78	struct drv_context *drvc;
	79
	80	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	81	sr_err("Driver context malloc failed.");
	82	return SR_ERR_MALLOC;
	83	}
	84
851d5b22	85	drvc->sr_ctx = sr_ctx;
46697e38 BV	86	di->priv = drvc;
	87
	88	return SR_OK;
	89	}
	90
	91	static GSList hw_scan(GSList options)
	92	{
	93	struct drv_context *drvc;
851d5b22 BV	94	struct dev_context *devc;
	95	struct sr_dev_inst *sdi;
	96	struct sr_usb_dev_inst *usb;
851d5b22 BV	97	struct sr_hwopt *opt;
	98	GSList usb_devices, devices, *l;
	99	const char *conn;
46697e38 BV	100
	101	(void)options;
	102
851d5b22 BV	103	if (!(drvc = di->priv)) {
	104	sr_err("Driver was not initialized.");
	105	return NULL;
	106	}
46697e38	107
851d5b22 BV	108	/* USB scan is always authoritative. */
	109	clear_instances();
	110
	111	conn = NULL;
	112	for (l = options; l; l = l->next) {
	113	opt = l->data;
	114	switch (opt->hwopt) {
	115	case SR_HWOPT_CONN:
	116	conn = opt->value;
	117	break;
	118	}
	119	}
	120	if (!conn)
	121	return NULL;
	122
	123	devices = NULL;
	124	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
	125	/* We have a list of sr_usb_dev_inst matching the connection
	126	* string. Wrap them in sr_dev_inst and we're done. */
	127	for (l = usb_devices; l; l = l->next) {
	128	usb = l->data;
	129	if (!(sdi = lascar_scan(usb->bus, usb->address))) {
	130	/* Not a Lascar EL-USB. */
	131	g_free(usb);
	132	continue;
	133	}
6aa1eb4e	134	devc = sdi->priv;
851d5b22	135	devc->usb = usb;
851d5b22 BV	136	drvc->instances = g_slist_append(drvc->instances, sdi);
	137	devices = g_slist_append(devices, sdi);
	138	}
	139	g_slist_free(usb_devices);
	140	} else
	141	g_slist_free_full(usb_devices, g_free);
46697e38 BV	142
	143	return devices;
	144	}
	145
	146	static GSList *hw_dev_list(void)
	147	{
	148	struct drv_context *drvc;
	149
6aa1eb4e BV	150	if (!(drvc = di->priv)) {
	151	sr_err("Driver was not initialized.");
	152	return NULL;
	153	}
46697e38 BV	154
	155	return drvc->instances;
	156	}
	157
	158	static int hw_dev_open(struct sr_dev_inst *sdi)
	159	{
6aa1eb4e BV	160	struct drv_context *drvc;
	161	struct dev_context *devc;
	162	int ret;
46697e38	163
6aa1eb4e BV	164	if (!(drvc = di->priv)) {
	165	sr_err("Driver was not initialized.");
	166	return SR_ERR;
	167	}
	168
	169	devc = sdi->priv;
	170	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
	171	return SR_ERR;
	172
	173	if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
	174	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	175	return SR_ERR;
	176	}
	177	sdi->status = SR_ST_ACTIVE;
	178
	179	return ret;
46697e38 BV	180	}
	181
	182	static int hw_dev_close(struct sr_dev_inst *sdi)
	183	{
6aa1eb4e BV	184	struct dev_context *devc;
	185
	186	if (!di->priv) {
	187	sr_err("Driver was not initialized.");
	188	return SR_ERR;
	189	}
	190
	191	devc = sdi->priv;
	192	if (!devc->usb->devhdl)
	193	/* Nothing to do. */
	194	return SR_OK;
	195
	196	libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
	197	libusb_close(devc->usb->devhdl);
	198	devc->usb->devhdl = NULL;
	199	g_free(devc->config);
	200	sdi->status = SR_ST_INACTIVE;
	201
46697e38 BV	202
	203	return SR_OK;
	204	}
	205
	206	static int hw_cleanup(void)
	207	{
6aa1eb4e	208	struct drv_context *drvc;
46697e38	209
6aa1eb4e BV	210	if (!(drvc = di->priv))
	211	/* Can get called on an unused driver, doesn't matter. */
	212	return SR_OK;
	213
	214	clear_instances();
	215	g_free(drvc);
	216	di->priv = NULL;
46697e38 BV	217
	218	return SR_OK;
	219	}
	220
	221	static int hw_info_get(int info_id, const void **data,
851d5b22	222	const struct sr_dev_inst *sdi)
46697e38	223	{
6aa1eb4e BV	224
	225	(void)sdi;
	226
46697e38	227	switch (info_id) {
6aa1eb4e BV	228	case SR_DI_HWOPTS:
	229	*data = hwopts;
	230	break;
	231	case SR_DI_HWCAPS:
	232	*data = hwcaps;
	233	break;
	234	case SR_DI_NUM_PROBES:
	235	*data = GINT_TO_POINTER(1);
	236	break;
	237	case SR_DI_PROBE_NAMES:
	238	*data = probe_names;
	239	break;
46697e38 BV	240	default:
	241	sr_err("Unknown info_id: %d.", info_id);
	242	return SR_ERR_ARG;
	243	}
	244
	245	return SR_OK;
	246	}
	247
	248	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
851d5b22	249	const void *value)
46697e38	250	{
6aa1eb4e	251	struct dev_context *devc;
46697e38 BV	252	int ret;
46697e38 BV	253
6aa1eb4e BV	254	if (!di->priv) {
	255	sr_err("Driver was not initialized.");
	256	return SR_ERR;
	257	}
46697e38 BV	258	if (sdi->status != SR_ST_ACTIVE) {
	259	sr_err("Device inactive, can't set config options.");
	260	return SR_ERR;
	261	}
	262
6aa1eb4e	263	devc = sdi->priv;
46697e38 BV	264	ret = SR_OK;
46697e38 BV	265	switch (hwcap) {
6aa1eb4e BV	266	case SR_HWCAP_LIMIT_SAMPLES:
	267	devc->limit_samples = (const uint64_t )value;
	268	sr_dbg("Setting sample limit to %" PRIu64 ".",
	269	devc->limit_samples);
	270	break;
46697e38 BV	271	default:
	272	sr_err("Unknown hardware capability: %d.", hwcap);
	273	ret = SR_ERR_ARG;
	274	}
	275
	276	return ret;
	277	}
	278
6aa1eb4e BV	279	static void mark_xfer(struct libusb_transfer *xfer)
	280	{
	281
	282	if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
	283	xfer->user_data = GINT_TO_POINTER(1);
	284	else
	285	xfer->user_data = GINT_TO_POINTER(-1);
	286
	287	}
	288
	289	/* The Lascar software, in its infinite ignorance, reads a set of four
	290	* bytes from the device config struct and interprets it as a float.
	291	* That only works because they only use windows, and only on x86. However
	292	* we may be running on any architecture, any operating system. So we have
	293	* to convert these four bytes as the Lascar software would on windows/x86,
	294	* to the local representation of a float.
	295	* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
	296	static float binary32_le_to_float(unsigned char *buf)
	297	{
	298	GFloatIEEE754 f;
	299
	300	f.v_float = 0;
	301	f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
	302	f.mpn.biased_exponent = (buf[3] << 1) \| (buf[2] >> 7);
	303	f.mpn.mantissa = buf[0] \| (buf[1] << 8) \| ((buf[2] & 0x7f) << 16);
	304
	305	return f.v_float;
	306	}
	307
	308	static int lascar_proc_config(const struct sr_dev_inst *sdi)
	309	{
	310	struct dev_context *devc;
	311	int ret;
	312
	313	devc = sdi->priv;
	314	if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
	315	return SR_ERR;
	316
	317	ret = SR_OK;
	318	switch (devc->profile->logformat) {
	319	case LOG_TEMP_RH:
	320	/* TODO */
	321	break;
	322	case LOG_CO:
	323	devc->sample_size = 2;
	324	devc->co_high = binary32_le_to_float(devc->config + 36);
	325	devc->co_low = binary32_le_to_float(devc->config + 40);
	326	sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
	327	devc->co_low);
	328	break;
	329	default:
	330	ret = SR_ERR_ARG;
	331	}
	332	devc->logged_samples = devc->config[0x1e] \| (devc->config[0x1f] << 8);
	333	sr_dbg("device log contains %d samples.", devc->logged_samples);
	334
	335	return ret;
	336	}
	337
46697e38	338	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
851d5b22	339	void *cb_data)
46697e38	340	{
6aa1eb4e BV	341	struct sr_datafeed_packet packet;
	342	struct sr_datafeed_header header;
	343	struct sr_datafeed_meta_analog meta;
	344	struct dev_context *devc;
	345	struct drv_context *drvc = di->priv;
	346	struct libusb_transfer xfer_in, xfer_out;
	347	const struct libusb_pollfd **pfd;
	348	struct timeval tv;
	349	int ret, i;
	350	unsigned char cmd[3], resp[4], *buf;
	351
	352	if (!di->priv) {
	353	sr_err("Driver was not initialized.");
	354	return SR_ERR;
	355	}
	356
	357	devc = sdi->priv;
	358	devc->cb_data = cb_data;
	359
	360	if (lascar_proc_config(sdi) != SR_OK)
	361	return SR_ERR;
	362
	363	sr_dbg("Starting log retrieval.");
	364
	365	/* Send header packet to the session bus. */
	366	sr_dbg("Sending SR_DF_HEADER.");
	367	packet.type = SR_DF_HEADER;
	368	packet.payload = (uint8_t *)&header;
	369	header.feed_version = 1;
	370	sr_session_send(devc->cb_data, &packet);
	371
	372	if (devc->logged_samples == 0) {
	373	/* This ensures the frontend knows the session is done. */
	374	packet.type = SR_DF_END;
	375	sr_session_send(devc->cb_data, &packet);
	376	return SR_OK;
	377	}
	378
	379	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	380	!(xfer_out = libusb_alloc_transfer(0)))
	381	return SR_ERR;
	382
	383	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	384	0x00, 0xffff, 0x00, NULL, 0, 50);
	385	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	386	0x02, 0x0002, 0x00, NULL, 0, 50);
	387	libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
	388	0x02, 0x0001, 0x00, NULL, 0, 50);
	389
	390
	391	/* Flush input. The F321 requires this. */
	392	while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
	393	256, &ret, 5) == 0 && ret > 0)
	394	;
	395
	396	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
	397	resp, sizeof(resp), mark_xfer, 0, 10000);
	398	if (libusb_submit_transfer(xfer_in) != 0) {
	399	libusb_free_transfer(xfer_in);
	400	libusb_free_transfer(xfer_out);
	401	return SR_ERR;
	402	}
	403
	404	cmd[0] = 0x03;
405	cmd[1] = 0xff;
406	cmd[2] = 0xff;
407	libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
408	cmd, 3, mark_xfer, 0, 100);
409	if (libusb_submit_transfer(xfer_out) != 0) {
410	libusb_free_transfer(xfer_in);
411	libusb_free_transfer(xfer_out);
412	return SR_ERR;
413	}
414
415	tv.tv_sec = 0;
416	tv.tv_usec = 0;
417	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
418	g_usleep(5000);
419	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
420	}
421	if (xfer_in->user_data != GINT_TO_POINTER(1) \|\|
422	xfer_in->user_data != GINT_TO_POINTER(1)) {
423	sr_dbg("no response to log transfer request");
424	libusb_free_transfer(xfer_in);
425	libusb_free_transfer(xfer_out);
426	return SR_ERR;
427	}
428	if (xfer_in->actual_length != 3 \|\| xfer_in->buffer[0] != 2) {
429	sr_dbg("invalid response to log transfer request");
430	libusb_free_transfer(xfer_in);
431	libusb_free_transfer(xfer_out);
432	return SR_ERR;
433	}
434	devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
435	libusb_free_transfer(xfer_out);
436
437	/* Send metadata about the SR_DF_ANALOG packets to come. */
438	packet.type = SR_DF_META_ANALOG;
439	packet.payload = &meta;
440	meta.num_probes = 1;
441	sr_session_send(devc->cb_data, &packet);
442
443	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
444	for (i = 0; pfd[i]; i++) {
445	/* Handle USB events every 100ms, for decent latency. */
446	sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
447	lascar_el_usb_handle_events, (void *)sdi);
448	/* We'll need to remove this fd later. */
449	devc->usbfd[i] = pfd[i]->fd;
450	}
451	devc->usbfd[i] = -1;
452
453	buf = g_try_malloc(4096);
454	libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
455	buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
456	if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
457	sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
458	libusb_free_transfer(xfer_in);
459	g_free(buf);
460	return SR_ERR;
461	}
46697e38 BV	462
	463	return SR_OK;
	464	}
	465
6aa1eb4e	466	SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
46697e38 BV	467	{
	468	(void)cb_data;
	469
6aa1eb4e BV	470	if (!di->priv) {
	471	sr_err("Driver was not initialized.");
	472	return SR_ERR;
	473	}
	474
46697e38 BV	475	if (sdi->status != SR_ST_ACTIVE) {
	476	sr_err("Device inactive, can't stop acquisition.");
	477	return SR_ERR;
	478	}
	479
6aa1eb4e BV	480	sdi->status = SR_ST_STOPPING;
6aa1eb4e BV	481	/* TODO: free ongoing transfers? */
46697e38 BV	482
	483	return SR_OK;
	484	}
	485
	486	SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
	487	.name = "lascar-el-usb",
	488	.longname = "Lascar EL-USB",
	489	.api_version = 1,
	490	.init = hw_init,
	491	.cleanup = hw_cleanup,
	492	.scan = hw_scan,
	493	.dev_list = hw_dev_list,
	494	.dev_clear = clear_instances,
	495	.dev_open = hw_dev_open,
	496	.dev_close = hw_dev_close,
	497	.info_get = hw_info_get,
	498	.dev_config_set = hw_dev_config_set,
	499	.dev_acquisition_start = hw_dev_acquisition_start,
	500	.dev_acquisition_stop = hw_dev_acquisition_stop,
	501	.priv = NULL,
	502	};