[libsigrok.git] / hardware / lascar-el-usb / protocol.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 <stdlib.h>
#include <sys/time.h>
#include <string.h>
#include <math.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

extern struct sr_dev_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;

static const struct elusb_profile profiles[] = {
	{ 1, "EL-USB-1", LOG_UNSUPPORTED },
	{ 2, "EL-USB-1", LOG_UNSUPPORTED },
	{ 3, "EL-USB-2", LOG_TEMP_RH },
	{ 4, "EL-USB-3", LOG_UNSUPPORTED },
	{ 5, "EL-USB-4", LOG_UNSUPPORTED },
	{ 6, "EL-USB-3", LOG_UNSUPPORTED },
	{ 7, "EL-USB-4", LOG_UNSUPPORTED },
	{ 8, "EL-USB-LITE", LOG_UNSUPPORTED },
	{ 9, "EL-USB-CO", LOG_CO },
	{ 10, "EL-USB-TC", LOG_UNSUPPORTED },
	{ 11, "EL-USB-CO300", LOG_CO },
	{ 12, "EL-USB-2-LCD", LOG_TEMP_RH },
	{ 13, "EL-USB-2+", LOG_TEMP_RH },
	{ 14, "EL-USB-1-PRO", LOG_UNSUPPORTED },
	{ 15, "EL-USB-TC-LCD", LOG_UNSUPPORTED },
	{ 16, "EL-USB-2-LCD+", LOG_TEMP_RH },
	{ 17, "EL-USB-5", LOG_UNSUPPORTED },
	{ 18, "EL-USB-1-RCG", LOG_UNSUPPORTED },
	{ 19, "EL-USB-1-LCD", LOG_UNSUPPORTED },
	{ 20, "EL-OEM-3", LOG_UNSUPPORTED },
	{ 21, "EL-USB-1-LCD", LOG_UNSUPPORTED },
	{ 0, NULL, 0 }
};


SR_PRIV libusb_device_handle *lascar_open(struct libusb_device *dev)
{
	libusb_device_handle *dev_hdl;
	int ret;

	if ((ret = libusb_open(dev, &dev_hdl)) != 0) {
		sr_dbg("failed to open device for scan: %s",
				libusb_error_name(ret));
		return NULL;
	}

	/* Some of these fail, but it needs doing -- some sort of mode
	 * setup for the SILabs F32x. */
	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x00, 0xffff, 0x00, NULL, 0, 50);
	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x02, 0x0002, 0x00, NULL, 0, 50);
	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
			0x02, 0x0001, 0x00, NULL, 0, 50);

	return dev_hdl;
}

static void mark_xfer(struct libusb_transfer *xfer)
{

	xfer->user_data = GINT_TO_POINTER(1);

}

SR_PRIV int lascar_get_config(libusb_device_handle *dev_hdl,
		unsigned char *configblock, int *configlen)
{
	struct drv_context *drvc;
	struct libusb_transfer *xfer_in, *xfer_out;
	struct timeval tv;
	int64_t start;
	int buflen;
	unsigned char cmd[3], buf[MAX_CONFIGBLOCK_SIZE];

	sr_spew("Reading config block.");

	drvc = di->priv;
	*configlen = 0;

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

	/* Flush anything the F321 still has queued. */
	while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
			5) == 0 && buflen > 0)
		;

	/* Keep a read request waiting in the wings, ready to pounce
	 * the moment the device sends something. */
	libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
			buf, 256, mark_xfer, 0, 10000);
	if (libusb_submit_transfer(xfer_in) != 0)
		goto cleanup;

	/* Request device configuration structure. */
	cmd[0] = 0x00;
	cmd[1] = 0xff;
	cmd[2] = 0xff;
	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
			cmd, 3, mark_xfer, 0, 100);
	if (libusb_submit_transfer(xfer_out) != 0)
		goto cleanup;

	tv.tv_sec = 0;
	tv.tv_usec = 0;
	start = g_get_monotonic_time();
	while (!xfer_in->user_data || !xfer_out->user_data) {
		if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
			start = 0;
			break;
		}
		g_usleep(5000);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}
	if (!start) {
		sr_dbg("no response");
		goto cleanup;
	}
	if (xfer_in->actual_length != 3) {
		sr_dbg("expected 3-byte header, got %d bytes", xfer_in->actual_length);
		goto cleanup;
	}

	/* Got configuration structure header. */
	sr_spew("Response to config request: 0x%.2x 0x%.2x 0x%.2x ",
			buf[0], buf[1], buf[2]);
	buflen = buf[1] | (buf[2] << 8);
	if (buf[0] != 0x02 || buflen > MAX_CONFIGBLOCK_SIZE) {
		sr_dbg("Invalid response to config request: "
				"0x%.2x 0x%.2x 0x%.2x ", buf[0], buf[1], buf[2]);
		libusb_close(dev_hdl);
		goto cleanup;
	}

	/* Get configuration structure. */
	xfer_in->length = buflen;
	xfer_in->user_data = 0;
	if (libusb_submit_transfer(xfer_in) != 0)
		goto cleanup;
	while (!xfer_in->user_data) {
		if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
			start = 0;
			break;
		}
		g_usleep(5000);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}
	if (!start) {
		sr_dbg("Timeout waiting for configuration structure.");
		goto cleanup;
	}
	if (xfer_in->actual_length != buflen) {
		sr_dbg("expected %d-byte structure, got %d bytes", buflen,
				xfer_in->actual_length);
		goto cleanup;
	}

	memcpy(configblock, buf, buflen);
	*configlen = buflen;

cleanup:
	if (!xfer_in->user_data || !xfer_in->user_data) {
		if (!xfer_in->user_data)
			libusb_cancel_transfer(xfer_in);
		if (!xfer_out->user_data)
			libusb_cancel_transfer(xfer_out);
		start = g_get_monotonic_time();
		while (!xfer_in->user_data || !xfer_out->user_data) {
			if (g_get_monotonic_time() - start > 10000)
				break;
			g_usleep(1000);
			libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
		}
	}
	libusb_free_transfer(xfer_in);
	libusb_free_transfer(xfer_out);

	return *configlen ? SR_OK : SR_ERR;
}

SR_PRIV int lascar_save_config(libusb_device_handle *dev_hdl,
		unsigned char *config, int configlen)
{
	struct drv_context *drvc;
	struct libusb_transfer *xfer_in, *xfer_out;
	struct timeval tv;
	int64_t start;
	int buflen, ret;
	unsigned char cmd[3], buf[256];

	sr_spew("Writing config block.");

	drvc = di->priv;

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

	/* Flush anything the F321 still has queued. */
	while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
			5) == 0 && buflen > 0)
		;
	ret = SR_OK;

	/* Keep a read request waiting in the wings, ready to pounce
	 * the moment the device sends something. */
	libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
			buf, 256, mark_xfer, 0, 10000);
	if (libusb_submit_transfer(xfer_in) != 0) {
		ret = SR_ERR;
		goto cleanup;
	}

	/* Request device configuration structure. */
	cmd[0] = 0x01;
	cmd[1] = configlen & 0xff;
	cmd[2] = (configlen >> 8) & 0xff;
	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
			cmd, 3, mark_xfer, 0, 100);
	if (libusb_submit_transfer(xfer_out) != 0) {
		ret = SR_ERR;
		goto cleanup;
	}
	tv.tv_sec = 0;
	tv.tv_usec = 0;
	while (!xfer_out->user_data) {
		g_usleep(5000);
		libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	}

	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
			config, configlen, mark_xfer, 0, 100);
	if (libusb_submit_transfer(xfer_out) != 0) {
		ret = SR_ERR;
		goto cleanup;
	}
	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->actual_length != 1 || buf[0] != 0xff) {
		sr_dbg("unexpected response after transfer");
		ret = SR_ERR;
	}

cleanup:
	if (!xfer_in->user_data || !xfer_in->user_data) {
		if (!xfer_in->user_data)
			libusb_cancel_transfer(xfer_in);
		if (!xfer_out->user_data)
			libusb_cancel_transfer(xfer_out);
		start = g_get_monotonic_time();
		while (!xfer_in->user_data || !xfer_out->user_data) {
			if (g_get_monotonic_time() - start > 10000)
				break;
			g_usleep(1000);
			libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
		}
	}
	libusb_free_transfer(xfer_in);
	libusb_free_transfer(xfer_out);

	return ret;
}

static struct sr_dev_inst *lascar_identify(unsigned char *config)
{
	struct dev_context *devc;
	const struct elusb_profile *profile;
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	int modelid, i;
	char firmware[5];

	modelid = config[0];
	sdi = NULL;
	if (modelid) {
		profile = NULL;
		for (i = 0; profiles[i].modelid; i++) {
			if (profiles[i].modelid == modelid) {
				profile = &profiles[i];
				break;
			}
		}
		if (!profile) {
			sr_dbg("unknown EL-USB modelid %d", modelid);
			return NULL;
		}

		i = config[52] | (config[53] << 8);
		memcpy(firmware, config + 0x30, 4);
		firmware[4] = '\0';
		sr_dbg("found %s with firmware version %s serial %d",
				profile->modelname, firmware, i);

		if (profile->logformat == LOG_UNSUPPORTED) {
			sr_dbg("unsupported EL-USB logformat for %s", profile->modelname);
			return NULL;
		}

		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, LASCAR_VENDOR,
				profile->modelname, firmware)))
			return NULL;
		sdi->driver = di;

		if (profile->logformat == LOG_TEMP_RH) {
			/* Model this as two probes: temperature and humidity. */
			if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "Temp")))
				return NULL;
			sdi->probes = g_slist_append(NULL, probe);
			if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "Hum")))
				return NULL;
			sdi->probes = g_slist_append(sdi->probes, probe);
		} else if (profile->logformat == LOG_CO) {
			if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "CO")))
				return NULL;
			sdi->probes = g_slist_append(NULL, probe);
		} else {
			if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
				return NULL;
			sdi->probes = g_slist_append(NULL, probe);
		}

		if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
			return NULL;
		sdi->priv = devc;
		devc->profile = profile;
	}

	return sdi;
}

SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address)
{
	struct drv_context *drvc;
	struct sr_dev_inst *sdi;
	struct libusb_device **devlist;
	struct libusb_device_descriptor des;
	libusb_device_handle *dev_hdl;
	int dummy, ret, i;
	unsigned char config[MAX_CONFIGBLOCK_SIZE];

	drvc = di->priv;
	sdi = NULL;

	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %d.", ret);
			continue;
		}

		if (libusb_get_bus_number(devlist[i]) != bus ||
				libusb_get_device_address(devlist[i]) != address)
			continue;

		if (!(dev_hdl = lascar_open(devlist[i])))
			continue;

		if (lascar_get_config(dev_hdl, config, &dummy) != SR_OK)
			continue;

		libusb_close(dev_hdl);
		sdi = lascar_identify(config);
	}

	return sdi;
}

static void lascar_el_usb_dispatch(struct sr_dev_inst *sdi, unsigned char *buf,
		int buflen)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog;
	struct sr_probe *probe;
	float *temp, *rh;
	uint16_t s;
	int samples, samples_left, i, j;

	devc = sdi->priv;

	samples = buflen / devc->sample_size;
	samples_left = devc->logged_samples - devc->rcvd_samples;
	if (samples_left < samples)
		samples = samples_left;
	switch (devc->profile->logformat) {
	case LOG_TEMP_RH:
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		analog.mqflags = 0;
		if (!(temp = g_try_malloc(sizeof(float) * samples)))
			break;
		if (!(rh = g_try_malloc(sizeof(float) * samples)))
			break;
		for (i = 0, j = 0; i < samples; i++) {
			/* Both Celcius and Fahrenheit stored at base -40. */
			if (devc->temp_unit == 0)
				/* Celcius is stored in half-degree increments. */
				temp[j] = buf[i * 2] / 2 - 40;
			else
				temp[j] = buf[i * 2] - 40;

			rh[j] = buf[i * 2 + 1] / 2;

			if (temp[j] == 0.0 && rh[j] == 0.0)
				/* Skip invalid measurement. */
				continue;
			j++;
		}
		analog.num_samples = j;

		probe = sdi->probes->data;
		if (probe->enabled) {
			analog.probes = g_slist_append(NULL, probe);
			analog.mq = SR_MQ_TEMPERATURE;
			if (devc->temp_unit == 1)
				analog.unit = SR_UNIT_FAHRENHEIT;
			else
				analog.unit = SR_UNIT_CELSIUS;
			analog.data = temp;
			sr_session_send(devc->cb_data, &packet);
		}

		probe = sdi->probes->next->data;
		if (probe->enabled) {
			analog.probes = g_slist_append(NULL, probe);
			analog.mq = SR_MQ_RELATIVE_HUMIDITY;
			analog.unit = SR_UNIT_PERCENTAGE;
			analog.data = rh;
			sr_session_send(devc->cb_data, &packet);
		}

		g_free(temp);
		g_free(rh);
		break;
	case LOG_CO:
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		analog.probes = sdi->probes;
		analog.num_samples = samples;
		analog.mq = SR_MQ_CARBON_MONOXIDE;
		analog.unit = SR_UNIT_CONCENTRATION;
		analog.mqflags = 0;
		if (!(analog.data = g_try_malloc(sizeof(float) * samples)))
			break;
		for (i = 0; i < samples; i++) {
			s = (buf[i * 2] << 8) | buf[i * 2 + 1];
			analog.data[i] = (s * devc->co_high + devc->co_low) / 1000000;
			if (analog.data[i] < 0.0)
				analog.data[i] = 0.0;
		}
		sr_session_send(devc->cb_data, &packet);
		g_free(analog.data);
		break;
	default:
		/* How did we even get this far? */
		break;
	}
	devc->rcvd_samples += samples;

}

SR_PRIV int lascar_el_usb_handle_events(int fd, int revents, void *cb_data)
{
	struct dev_context *devc;
	struct drv_context *drvc = di->priv;
	struct sr_datafeed_packet packet;
	struct sr_dev_inst *sdi;
	struct timeval tv;
	int i;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	devc = sdi->priv;

	if (sdi->status == SR_ST_STOPPING) {
		for (i = 0; devc->usbfd[i] != -1; i++)
			sr_source_remove(devc->usbfd[i]);

		sdi->driver->dev_close(sdi);

		packet.type = SR_DF_END;
		sr_session_send(cb_data, &packet);
	}

	memset(&tv, 0, sizeof(struct timeval));
	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
					       NULL);

	return TRUE;
}

SR_PRIV void lascar_el_usb_receive_transfer(struct libusb_transfer *transfer)
{
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	int ret;
	gboolean packet_has_error;

	sdi = transfer->user_data;
	devc = sdi->priv;

	packet_has_error = FALSE;
	switch (transfer->status) {
	case LIBUSB_TRANSFER_NO_DEVICE:
		/* USB device was unplugged. */
		hw_dev_acquisition_stop(sdi, sdi);
		return;
	case LIBUSB_TRANSFER_COMPLETED:
	case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
		break;
	default:
		packet_has_error = TRUE;
		break;
	}

	if (!packet_has_error) {
		if (devc->rcvd_samples < devc->logged_samples)
			lascar_el_usb_dispatch(sdi, transfer->buffer,
					transfer->actual_length);
		devc->rcvd_bytes += transfer->actual_length;
		sr_spew("received %d/%d bytes (%d/%d samples)",
				devc->rcvd_bytes, devc->log_size,
				devc->rcvd_samples, devc->logged_samples);
		if (devc->rcvd_bytes >= devc->log_size)
			hw_dev_acquisition_stop(sdi, sdi);
	}

	if (sdi->status == SR_ST_ACTIVE) {
		/* Send the same request again. */
		if ((ret = libusb_submit_transfer(transfer) != 0)) {
			sr_err("Unable to resubmit transfer: %s.",
			       libusb_error_name(ret));
			g_free(transfer->buffer);
			libusb_free_transfer(transfer);
			hw_dev_acquisition_stop(sdi, sdi);
		}
	} else {
		/* This was the last transfer we're going to receive, so
		 * clean up now. */
		g_free(transfer->buffer);
		libusb_free_transfer(transfer);
	}

}

static int get_flags(unsigned char *configblock)
{
	int flags;

	flags = (configblock[32] | (configblock[33] << 8)) & 0x1fff;
	sr_spew("Read flags (0x%.4x).", flags);

	return flags;
}

static int set_flags(unsigned char *configblock, int flags)
{

	sr_spew("Setting flags to 0x%.4x.", flags);
	configblock[32] = flags & 0xff;
	configblock[33] = (flags >> 8) & 0x1f;

	return flags;
}

SR_PRIV int lascar_is_logging(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int dummy, flags, ret;

	devc = sdi->priv;
	if (lascar_get_config(devc->usb->devhdl, devc->config, &dummy) != SR_OK)
		return -1;

	flags = get_flags(devc->config);
	if (flags & 0x0100)
		ret = 1;
	else
		ret = 0;

	return ret;
}

SR_PRIV int lascar_start_logging(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int len, flags, ret;

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

	/* Turn on logging. */
	flags = get_flags(devc->config);
	flags |= 0x0100;
	set_flags(devc->config, flags);

	/* Start logging in 0 seconds. */
	memset(devc->config + 24, 0, 4);

	ret = lascar_save_config(devc->usb->devhdl, devc->config, len);
	sr_info("Started internal logging.");

	return ret;
}

SR_PRIV int lascar_stop_logging(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int len, flags, ret;

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

	flags = get_flags(devc->config);
	flags &= ~0x0100;
	set_flags(devc->config, flags);

	ret = lascar_save_config(devc->usb->devhdl, devc->config, len);
	sr_info("Stopped internal logging.");

	return ret;
}
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 <stdlib.h>
851d5b22 BV	21	#include <sys/time.h>
851d5b22 BV	22	#include <string.h>
6aa1eb4e	23	#include <math.h>
46697e38 BV	24	#include <glib.h>
	25	#include "libsigrok.h"
	26	#include "libsigrok-internal.h"
	27	#include "protocol.h"
	28
851d5b22 BV	29	extern struct sr_dev_driver lascar_el_usb_driver_info;
	30	static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
	31
	32	static const struct elusb_profile profiles[] = {
	33	{ 1, "EL-USB-1", LOG_UNSUPPORTED },
	34	{ 2, "EL-USB-1", LOG_UNSUPPORTED },
	35	{ 3, "EL-USB-2", LOG_TEMP_RH },
	36	{ 4, "EL-USB-3", LOG_UNSUPPORTED },
	37	{ 5, "EL-USB-4", LOG_UNSUPPORTED },
	38	{ 6, "EL-USB-3", LOG_UNSUPPORTED },
	39	{ 7, "EL-USB-4", LOG_UNSUPPORTED },
	40	{ 8, "EL-USB-LITE", LOG_UNSUPPORTED },
	41	{ 9, "EL-USB-CO", LOG_CO },
	42	{ 10, "EL-USB-TC", LOG_UNSUPPORTED },
b6506d5e	43	{ 11, "EL-USB-CO300", LOG_CO },
6787f404 BV	44	{ 12, "EL-USB-2-LCD", LOG_TEMP_RH },
6787f404 BV	45	{ 13, "EL-USB-2+", LOG_TEMP_RH },
851d5b22 BV	46	{ 14, "EL-USB-1-PRO", LOG_UNSUPPORTED },
851d5b22 BV	47	{ 15, "EL-USB-TC-LCD", LOG_UNSUPPORTED },
6787f404	48	{ 16, "EL-USB-2-LCD+", LOG_TEMP_RH },
851d5b22 BV	49	{ 17, "EL-USB-5", LOG_UNSUPPORTED },
	50	{ 18, "EL-USB-1-RCG", LOG_UNSUPPORTED },
	51	{ 19, "EL-USB-1-LCD", LOG_UNSUPPORTED },
	52	{ 20, "EL-OEM-3", LOG_UNSUPPORTED },
	53	{ 21, "EL-USB-1-LCD", LOG_UNSUPPORTED },
	54	{ 0, NULL, 0 }
	55	};
	56
	57
6aa1eb4e BV	58	SR_PRIV libusb_device_handle lascar_open(struct libusb_device dev)
	59	{
	60	libusb_device_handle *dev_hdl;
	61	int ret;
	62
	63	if ((ret = libusb_open(dev, &dev_hdl)) != 0) {
	64	sr_dbg("failed to open device for scan: %s",
	65	libusb_error_name(ret));
	66	return NULL;
	67	}
	68
	69	/* Some of these fail, but it needs doing -- some sort of mode
	70	* setup for the SILabs F32x. */
	71	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
	72	0x00, 0xffff, 0x00, NULL, 0, 50);
	73	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
	74	0x02, 0x0002, 0x00, NULL, 0, 50);
	75	libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
	76	0x02, 0x0001, 0x00, NULL, 0, 50);
	77
	78	return dev_hdl;
	79	}
	80
	81	static void mark_xfer(struct libusb_transfer *xfer)
851d5b22 BV	82	{
	83
	84	xfer->user_data = GINT_TO_POINTER(1);
	85
	86	}
	87
361d1511 BV	88	SR_PRIV int lascar_get_config(libusb_device_handle *dev_hdl,
361d1511 BV	89	unsigned char configblock, int configlen)
851d5b22 BV	90	{
851d5b22 BV	91	struct drv_context *drvc;
851d5b22 BV	92	struct libusb_transfer xfer_in, xfer_out;
	93	struct timeval tv;
	94	int64_t start;
6aa1eb4e	95	int buflen;
361d1511 BV	96	unsigned char cmd[3], buf[MAX_CONFIGBLOCK_SIZE];
	97
	98	sr_spew("Reading config block.");
851d5b22 BV	99
851d5b22 BV	100	drvc = di->priv;
361d1511	101	*configlen = 0;
851d5b22 BV	102
	103	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	104	!(xfer_out = libusb_alloc_transfer(0)))
361d1511	105	return SR_ERR;
851d5b22 BV	106
	107	/* Flush anything the F321 still has queued. */
	108	while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
	109	5) == 0 && buflen > 0)
	110	;
	111
	112	/* Keep a read request waiting in the wings, ready to pounce
	113	* the moment the device sends something. */
	114	libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
6aa1eb4e	115	buf, 256, mark_xfer, 0, 10000);
851d5b22 BV	116	if (libusb_submit_transfer(xfer_in) != 0)
	117	goto cleanup;
	118
	119	/* Request device configuration structure. */
	120	cmd[0] = 0x00;
	121	cmd[1] = 0xff;
	122	cmd[2] = 0xff;
	123	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
6aa1eb4e	124	cmd, 3, mark_xfer, 0, 100);
851d5b22 BV	125	if (libusb_submit_transfer(xfer_out) != 0)
	126	goto cleanup;
	127
	128	tv.tv_sec = 0;
	129	tv.tv_usec = 0;
	130	start = g_get_monotonic_time();
	131	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	132	if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
	133	start = 0;
	134	break;
	135	}
	136	g_usleep(5000);
	137	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	138	}
	139	if (!start) {
	140	sr_dbg("no response");
	141	goto cleanup;
	142	}
	143	if (xfer_in->actual_length != 3) {
	144	sr_dbg("expected 3-byte header, got %d bytes", xfer_in->actual_length);
	145	goto cleanup;
	146	}
	147
	148	/* Got configuration structure header. */
361d1511	149	sr_spew("Response to config request: 0x%.2x 0x%.2x 0x%.2x ",
851d5b22 BV	150	buf[0], buf[1], buf[2]);
851d5b22 BV	151	buflen = buf[1] \| (buf[2] << 8);
361d1511	152	if (buf[0] != 0x02 \|\| buflen > MAX_CONFIGBLOCK_SIZE) {
851d5b22 BV	153	sr_dbg("Invalid response to config request: "
	154	"0x%.2x 0x%.2x 0x%.2x ", buf[0], buf[1], buf[2]);
	155	libusb_close(dev_hdl);
	156	goto cleanup;
	157	}
	158
	159	/* Get configuration structure. */
	160	xfer_in->length = buflen;
	161	xfer_in->user_data = 0;
	162	if (libusb_submit_transfer(xfer_in) != 0)
	163	goto cleanup;
	164	while (!xfer_in->user_data) {
	165	if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
	166	start = 0;
	167	break;
	168	}
	169	g_usleep(5000);
	170	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	171	}
	172	if (!start) {
	173	sr_dbg("Timeout waiting for configuration structure.");
	174	goto cleanup;
	175	}
	176	if (xfer_in->actual_length != buflen) {
	177	sr_dbg("expected %d-byte structure, got %d bytes", buflen,
	178	xfer_in->actual_length);
	179	goto cleanup;
	180	}
6aa1eb4e	181
361d1511 BV	182	memcpy(configblock, buf, buflen);
361d1511 BV	183	*configlen = buflen;
851d5b22 BV	184
	185	cleanup:
	186	if (!xfer_in->user_data \|\| !xfer_in->user_data) {
	187	if (!xfer_in->user_data)
	188	libusb_cancel_transfer(xfer_in);
	189	if (!xfer_out->user_data)
	190	libusb_cancel_transfer(xfer_out);
	191	start = g_get_monotonic_time();
	192	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	193	if (g_get_monotonic_time() - start > 10000)
	194	break;
	195	g_usleep(1000);
	196	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	197	}
	198	}
	199	libusb_free_transfer(xfer_in);
	200	libusb_free_transfer(xfer_out);
	201
361d1511	202	return *configlen ? SR_OK : SR_ERR;
6aa1eb4e BV	203	}
6aa1eb4e BV	204
b0c95747 BV	205	SR_PRIV int lascar_save_config(libusb_device_handle *dev_hdl,
	206	unsigned char *config, int configlen)
	207	{
	208	struct drv_context *drvc;
	209	struct libusb_transfer xfer_in, xfer_out;
	210	struct timeval tv;
	211	int64_t start;
	212	int buflen, ret;
	213	unsigned char cmd[3], buf[256];
	214
361d1511 BV	215	sr_spew("Writing config block.");
361d1511 BV	216
b0c95747 BV	217	drvc = di->priv;
	218
	219	if (!(xfer_in = libusb_alloc_transfer(0)) \|\|
	220	!(xfer_out = libusb_alloc_transfer(0)))
	221	return SR_ERR;
	222
	223	/* Flush anything the F321 still has queued. */
	224	while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
	225	5) == 0 && buflen > 0)
	226	;
	227	ret = SR_OK;
	228
	229	/* Keep a read request waiting in the wings, ready to pounce
	230	* the moment the device sends something. */
	231	libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
	232	buf, 256, mark_xfer, 0, 10000);
	233	if (libusb_submit_transfer(xfer_in) != 0) {
	234	ret = SR_ERR;
	235	goto cleanup;
	236	}
	237
	238	/* Request device configuration structure. */
	239	cmd[0] = 0x01;
	240	cmd[1] = configlen & 0xff;
	241	cmd[2] = (configlen >> 8) & 0xff;
	242	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
	243	cmd, 3, mark_xfer, 0, 100);
	244	if (libusb_submit_transfer(xfer_out) != 0) {
	245	ret = SR_ERR;
	246	goto cleanup;
	247	}
	248	tv.tv_sec = 0;
	249	tv.tv_usec = 0;
	250	while (!xfer_out->user_data) {
	251	g_usleep(5000);
	252	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	253	}
	254
	255	libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
	256	config, configlen, mark_xfer, 0, 100);
	257	if (libusb_submit_transfer(xfer_out) != 0) {
	258	ret = SR_ERR;
	259	goto cleanup;
	260	}
	261	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	262	g_usleep(5000);
	263	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
	264	}
	265
	266	if (xfer_in->actual_length != 1 \|\| buf[0] != 0xff) {
	267	sr_dbg("unexpected response after transfer");
	268	ret = SR_ERR;
	269	}
	270
	271	cleanup:
	272	if (!xfer_in->user_data \|\| !xfer_in->user_data) {
	273	if (!xfer_in->user_data)
	274	libusb_cancel_transfer(xfer_in);
	275	if (!xfer_out->user_data)
	276	libusb_cancel_transfer(xfer_out);
	277	start = g_get_monotonic_time();
	278	while (!xfer_in->user_data \|\| !xfer_out->user_data) {
	279	if (g_get_monotonic_time() - start > 10000)
	280	break;
281	g_usleep(1000);
282	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
283	}
284	}
285	libusb_free_transfer(xfer_in);
286	libusb_free_transfer(xfer_out);
287
288	return ret;
289	}
290
6aa1eb4e BV	291	static struct sr_dev_inst lascar_identify(unsigned char config)
	292	{
	293	struct dev_context *devc;
	294	const struct elusb_profile *profile;
	295	struct sr_dev_inst *sdi;
	296	struct sr_probe *probe;
	297	int modelid, i;
	298	char firmware[5];
	299
	300	modelid = config[0];
851d5b22 BV	301	sdi = NULL;
	302	if (modelid) {
	303	profile = NULL;
	304	for (i = 0; profiles[i].modelid; i++) {
	305	if (profiles[i].modelid == modelid) {
	306	profile = &profiles[i];
	307	break;
	308	}
	309	}
	310	if (!profile) {
	311	sr_dbg("unknown EL-USB modelid %d", modelid);
	312	return NULL;
	313	}
	314
6aa1eb4e BV	315	i = config[52] \| (config[53] << 8);
6aa1eb4e BV	316	memcpy(firmware, config + 0x30, 4);
851d5b22 BV	317	firmware[4] = '\0';
	318	sr_dbg("found %s with firmware version %s serial %d",
	319	profile->modelname, firmware, i);
	320
	321	if (profile->logformat == LOG_UNSUPPORTED) {
	322	sr_dbg("unsupported EL-USB logformat for %s", profile->modelname);
	323	return NULL;
	324	}
	325
	326	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, LASCAR_VENDOR,
	327	profile->modelname, firmware)))
	328	return NULL;
	329	sdi->driver = di;
6aa1eb4e	330
1d166757 BV	331	if (profile->logformat == LOG_TEMP_RH) {
	332	/* Model this as two probes: temperature and humidity. */
	333	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "Temp")))
	334	return NULL;
	335	sdi->probes = g_slist_append(NULL, probe);
	336	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "Hum")))
	337	return NULL;
	338	sdi->probes = g_slist_append(sdi->probes, probe);
	339	} else if (profile->logformat == LOG_CO) {
	340	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "CO")))
	341	return NULL;
	342	sdi->probes = g_slist_append(NULL, probe);
	343	} else {
	344	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	345	return NULL;
	346	sdi->probes = g_slist_append(NULL, probe);
	347	}
6aa1eb4e BV	348
	349	if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
	350	return NULL;
	351	sdi->priv = devc;
	352	devc->profile = profile;
851d5b22 BV	353	}
	354
	355	return sdi;
	356	}
	357
	358	SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address)
	359	{
	360	struct drv_context *drvc;
	361	struct sr_dev_inst *sdi;
	362	struct libusb_device **devlist;
	363	struct libusb_device_descriptor des;
	364	libusb_device_handle *dev_hdl;
361d1511 BV	365	int dummy, ret, i;
361d1511 BV	366	unsigned char config[MAX_CONFIGBLOCK_SIZE];
851d5b22 BV	367
	368	drvc = di->priv;
	369	sdi = NULL;
	370
	371	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	372	for (i = 0; devlist[i]; i++) {
	373	if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
	374	sr_err("Failed to get device descriptor: %d.", ret);
	375	continue;
	376	}
	377
	378	if (libusb_get_bus_number(devlist[i]) != bus \|\|
	379	libusb_get_device_address(devlist[i]) != address)
	380	continue;
	381
6aa1eb4e BV	382	if (!(dev_hdl = lascar_open(devlist[i])))
	383	continue;
	384
361d1511	385	if (lascar_get_config(dev_hdl, config, &dummy) != SR_OK)
851d5b22	386	continue;
851d5b22	387
851d5b22	388	libusb_close(dev_hdl);
6aa1eb4e	389	sdi = lascar_identify(config);
851d5b22 BV	390	}
	391
	392	return sdi;
	393	}
	394
6aa1eb4e BV	395	static void lascar_el_usb_dispatch(struct sr_dev_inst sdi, unsigned char buf,
	396	int buflen)
	397	{
	398	struct dev_context *devc;
	399	struct sr_datafeed_packet packet;
	400	struct sr_datafeed_analog analog;
1d166757	401	struct sr_probe *probe;
6787f404	402	float temp, rh;
6aa1eb4e	403	uint16_t s;
6787f404	404	int samples, samples_left, i, j;
6aa1eb4e BV	405
6aa1eb4e BV	406	devc = sdi->priv;
69e19dd7	407
6aa1eb4e BV	408	samples = buflen / devc->sample_size;
	409	samples_left = devc->logged_samples - devc->rcvd_samples;
	410	if (samples_left < samples)
	411	samples = samples_left;
	412	switch (devc->profile->logformat) {
	413	case LOG_TEMP_RH:
6787f404 BV	414	packet.type = SR_DF_ANALOG;
	415	packet.payload = &analog;
	416	analog.mqflags = 0;
	417	if (!(temp = g_try_malloc(sizeof(float) * samples)))
	418	break;
	419	if (!(rh = g_try_malloc(sizeof(float) * samples)))
	420	break;
	421	for (i = 0, j = 0; i < samples; i++) {
	422	/* Both Celcius and Fahrenheit stored at base -40. */
	423	if (devc->temp_unit == 0)
	424	/* Celcius is stored in half-degree increments. */
	425	temp[j] = buf[i * 2] / 2 - 40;
	426	else
	427	temp[j] = buf[i * 2] - 40;
	428
	429	rh[j] = buf[i * 2 + 1] / 2;
	430
	431	if (temp[j] == 0.0 && rh[j] == 0.0)
	432	/* Skip invalid measurement. */
	433	continue;
	434	j++;
	435	}
	436	analog.num_samples = j;
	437
1d166757 BV	438	probe = sdi->probes->data;
	439	if (probe->enabled) {
	440	analog.probes = g_slist_append(NULL, probe);
	441	analog.mq = SR_MQ_TEMPERATURE;
	442	if (devc->temp_unit == 1)
	443	analog.unit = SR_UNIT_FAHRENHEIT;
	444	else
	445	analog.unit = SR_UNIT_CELSIUS;
	446	analog.data = temp;
	447	sr_session_send(devc->cb_data, &packet);
	448	}
	449
	450	probe = sdi->probes->next->data;
	451	if (probe->enabled) {
	452	analog.probes = g_slist_append(NULL, probe);
	453	analog.mq = SR_MQ_RELATIVE_HUMIDITY;
	454	analog.unit = SR_UNIT_PERCENTAGE;
	455	analog.data = rh;
	456	sr_session_send(devc->cb_data, &packet);
	457	}
	458
6787f404 BV	459	g_free(temp);
6787f404 BV	460	g_free(rh);
6aa1eb4e BV	461	break;
	462	case LOG_CO:
	463	packet.type = SR_DF_ANALOG;
	464	packet.payload = &analog;
1d166757	465	analog.probes = sdi->probes;
6aa1eb4e	466	analog.num_samples = samples;
4f3bd685 BV	467	analog.mq = SR_MQ_CARBON_MONOXIDE;
4f3bd685 BV	468	analog.unit = SR_UNIT_CONCENTRATION;
6aa1eb4e BV	469	analog.mqflags = 0;
	470	if (!(analog.data = g_try_malloc(sizeof(float) * samples)))
	471	break;
	472	for (i = 0; i < samples; i++) {
	473	s = (buf[i * 2] << 8) \| buf[i * 2 + 1];
7f00750c	474	analog.data[i] = (s * devc->co_high + devc->co_low) / 1000000;
6aa1eb4e BV	475	if (analog.data[i] < 0.0)
	476	analog.data[i] = 0.0;
	477	}
	478	sr_session_send(devc->cb_data, &packet);
	479	g_free(analog.data);
	480	break;
	481	default:
	482	/* How did we even get this far? */
	483	break;
	484	}
	485	devc->rcvd_samples += samples;
	486
	487	}
851d5b22	488
6aa1eb4e	489	SR_PRIV int lascar_el_usb_handle_events(int fd, int revents, void *cb_data)
46697e38	490	{
46697e38	491	struct dev_context *devc;
6aa1eb4e BV	492	struct drv_context *drvc = di->priv;
	493	struct sr_datafeed_packet packet;
	494	struct sr_dev_inst *sdi;
	495	struct timeval tv;
	496	int i;
46697e38	497
6aa1eb4e BV	498	(void)fd;
6aa1eb4e BV	499	(void)revents;
46697e38	500
6aa1eb4e BV	501	sdi = cb_data;
6aa1eb4e BV	502	devc = sdi->priv;
46697e38	503
6aa1eb4e BV	504	if (sdi->status == SR_ST_STOPPING) {
	505	for (i = 0; devc->usbfd[i] != -1; i++)
	506	sr_source_remove(devc->usbfd[i]);
	507
	508	sdi->driver->dev_close(sdi);
	509
	510	packet.type = SR_DF_END;
	511	sr_session_send(cb_data, &packet);
46697e38 BV	512	}
46697e38 BV	513
6aa1eb4e BV	514	memset(&tv, 0, sizeof(struct timeval));
	515	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
	516	NULL);
	517
46697e38 BV	518	return TRUE;
46697e38 BV	519	}
6aa1eb4e BV	520
	521	SR_PRIV void lascar_el_usb_receive_transfer(struct libusb_transfer *transfer)
	522	{
	523	struct dev_context *devc;
	524	struct sr_dev_inst *sdi;
	525	int ret;
	526	gboolean packet_has_error;
	527
	528	sdi = transfer->user_data;
	529	devc = sdi->priv;
	530
	531	packet_has_error = FALSE;
	532	switch (transfer->status) {
	533	case LIBUSB_TRANSFER_NO_DEVICE:
	534	/* USB device was unplugged. */
	535	hw_dev_acquisition_stop(sdi, sdi);
	536	return;
	537	case LIBUSB_TRANSFER_COMPLETED:
	538	case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though */
	539	break;
	540	default:
	541	packet_has_error = TRUE;
	542	break;
	543	}
	544
	545	if (!packet_has_error) {
	546	if (devc->rcvd_samples < devc->logged_samples)
	547	lascar_el_usb_dispatch(sdi, transfer->buffer,
	548	transfer->actual_length);
	549	devc->rcvd_bytes += transfer->actual_length;
	550	sr_spew("received %d/%d bytes (%d/%d samples)",
	551	devc->rcvd_bytes, devc->log_size,
	552	devc->rcvd_samples, devc->logged_samples);
	553	if (devc->rcvd_bytes >= devc->log_size)
	554	hw_dev_acquisition_stop(sdi, sdi);
	555	}
	556
	557	if (sdi->status == SR_ST_ACTIVE) {
	558	/* Send the same request again. */
	559	if ((ret = libusb_submit_transfer(transfer) != 0)) {
	560	sr_err("Unable to resubmit transfer: %s.",
	561	libusb_error_name(ret));
	562	g_free(transfer->buffer);
	563	libusb_free_transfer(transfer);
	564	hw_dev_acquisition_stop(sdi, sdi);
	565	}
	566	} else {
	567	/* This was the last transfer we're going to receive, so
	568	* clean up now. */
	569	g_free(transfer->buffer);
	570	libusb_free_transfer(transfer);
	571	}
	572
	573	}
361d1511 BV	574
	575	static int get_flags(unsigned char *configblock)
	576	{
	577	int flags;
	578
	579	flags = (configblock[32] \| (configblock[33] << 8)) & 0x1fff;
	580	sr_spew("Read flags (0x%.4x).", flags);
	581
	582	return flags;
	583	}
	584
	585	static int set_flags(unsigned char *configblock, int flags)
	586	{
	587
	588	sr_spew("Setting flags to 0x%.4x.", flags);
	589	configblock[32] = flags & 0xff;
	590	configblock[33] = (flags >> 8) & 0x1f;
	591
	592	return flags;
	593	}
	594
	595	SR_PRIV int lascar_is_logging(const struct sr_dev_inst *sdi)
	596	{
	597	struct dev_context *devc;
	598	int dummy, flags, ret;
	599
	600	devc = sdi->priv;
	601	if (lascar_get_config(devc->usb->devhdl, devc->config, &dummy) != SR_OK)
	602	return -1;
	603
	604	flags = get_flags(devc->config);
	605	if (flags & 0x0100)
	606	ret = 1;
	607	else
	608	ret = 0;
	609
	610	return ret;
	611	}
	612
	613	SR_PRIV int lascar_start_logging(const struct sr_dev_inst *sdi)
	614	{
	615	struct dev_context *devc;
	616	int len, flags, ret;
	617
	618	devc = sdi->priv;
	619	if (lascar_get_config(devc->usb->devhdl, devc->config, &len) != SR_OK)
	620	return SR_ERR;
	621
	622	/* Turn on logging. */
	623	flags = get_flags(devc->config);
	624	flags \|= 0x0100;
	625	set_flags(devc->config, flags);
	626
	627	/* Start logging in 0 seconds. */
	628	memset(devc->config + 24, 0, 4);
	629
	630	ret = lascar_save_config(devc->usb->devhdl, devc->config, len);
	631	sr_info("Started internal logging.");
	632
	633	return ret;
	634	}
	635
	636	SR_PRIV int lascar_stop_logging(const struct sr_dev_inst *sdi)
	637	{
638	struct dev_context *devc;
639	int len, flags, ret;
640
641	devc = sdi->priv;
642	if (lascar_get_config(devc->usb->devhdl, devc->config, &len) != SR_OK)
643	return SR_ERR;
644
645	flags = get_flags(devc->config);
646	flags &= ~0x0100;
647	set_flags(devc->config, flags);
648
649	ret = lascar_save_config(devc->usb->devhdl, devc->config, len);
650	sr_info("Stopped internal logging.");
651
652	return ret;
653	}
654